CN114849832B - Crushing and screening device for constructional engineering - Google Patents

Abstract

The present invention discloses a crushing and screening device for construction engineering, including a box body, which is a rectangular hollow structure, a feed port is provided on one side of the box body near the top, a discharge port is provided on the other side near the bottom, a feed pipe is provided at the feed port, a first dustproof component is provided in the feed pipe, a discharge pipe is provided at the discharge port, a second dustproof component is provided in the discharge pipe, a multi-stage crushing component is provided in the box body, a driving component for driving the crushing component to work is provided on the rear end face of the box body, an adjusting mechanism for increasing the torque of the crushing component is provided in the driving component, and a multi-stage screening component with different screening diameters is also provided in the box body. The beneficial effect is that when the device is in use, materials of different sizes can be processed separately through the primary screening component, the primary crushing component, the secondary screening component, and the secondary crushing component, thereby improving the screening effect, the screening efficiency, and the service life of the device.

Description

A crushing and screening device for construction engineering

Technical Field

The invention belongs to the technical field of construction engineering equipment, and in particular relates to a crushing and screening device for construction engineering.

Background Art

Construction projects refer to the engineering entities formed by the construction of various types of buildings and their ancillary facilities and the installation of supporting lines, pipelines, and equipment. "Buildings" refer to projects with roofs, beams, columns, walls, foundations, and internal spaces that can meet people's needs for production, living, learning, and public activities; building materials need to be crushed at construction sites, and some building materials can be reused after crushing to avoid waste of building materials.

The existing crushing and screening devices used in construction projects cannot crush materials well when in use, and the crushing effect is poor. In addition, if materials with higher hardness are encountered during the crushing process, the equipment is easily damaged and cannot be used. In addition, the existing crushing and screening devices are inefficient, and generate a lot of dust during crushing, which pollutes the environment.

Summary of the invention

The purpose of the present invention is to provide a crushing and screening device for construction engineering in order to solve the above-mentioned problems.

In order to achieve the above technical objectives, the present invention provides the following technical solutions:

The present invention provides a crushing and screening device for construction engineering, comprising a box body, the box body is a rectangular hollow structure, a feed port is provided on one side of the box body near the top, a discharge port is provided on the other side near the bottom, a feed pipe is provided at the feed port, a first dustproof component is provided in the feed pipe, a discharge pipe is provided at the discharge port, a second dustproof component is provided in the discharge pipe, a multi-stage crushing component is provided in the box body, a driving component for driving the crushing component to work is provided on the rear end surface of the box body, an adjusting mechanism for increasing the torque of the crushing component is provided in the driving component, and a multi-stage screening component with different screening diameters is also provided in the box body;

The multi-stage crushing component is divided into a primary crushing component and a secondary crushing component;

The multi-stage screening assembly is divided into a primary screening assembly and a secondary screening assembly;

The primary screening assembly, the primary crushing assembly, the secondary screening assembly, and the secondary crushing assembly are all arranged in the box body, and are arranged from top to bottom;

The primary screening assembly comprises a first screening plate, the first screening plate is arranged with one end higher and the other end lower, the high end of the first screening plate is arranged near the feed port and is rotatably matched with the inner wall of the box, the low end of the first screening plate is connected with a second connecting plate, the inner wall of the box is provided with a second supporting plate for supporting the second connecting plate, the second supporting plate is arranged vertically, a plurality of first screening holes are evenly provided on the first screening plate, two first moving rods are connected to the second connecting plate, and the two first moving rods and the second connecting plate are spliced to form an approximately U-shaped structure;

The first-level crushing assembly is arranged on the side of the second supporting plate away from the feeding port, the first-level crushing assembly comprises a third crushing roller and a fourth crushing roller arranged horizontally, and the third crushing roller and the fourth crushing roller cooperate to crush the building materials falling between the two, the third crushing roller is arranged close to the second supporting plate, the third crushing roller and the fourth crushing roller are respectively connected to the box body through a third connecting shaft and a fourth connecting shaft, one end of the third connecting shaft and the fourth connecting shaft both penetrate the rear end surface of the box body and extend into the driving assembly, two second cams are installed on the third connecting shaft, the two second cams are respectively matched with the two first moving rods, and the two second cams are respectively arranged in front of and behind the third crushing roller, and a secondary screening assembly is arranged below the first-level crushing assembly;

The secondary screening assembly comprises a second screening plate, the second screening plate is tilted and arranged with one end higher than the other end, the high end of the second screening plate is rotatably matched with the inner wall of the box, the high end of the second screening plate is located below the fourth crushing roller, the low end of the second screening plate is connected to the third connecting plate, the box is provided with a third supporting plate for supporting the third connecting plate, the third supporting plate is vertically arranged, the third supporting plate is located between the second supporting plate and the feed port, two second moving rods are connected to the third connecting plate, the third connecting plate and the two second moving rods are spliced to form an approximately U-shaped structure, a plurality of second screening holes are opened on the second screening plate, and a secondary crushing assembly is arranged below the second screening plate;

The secondary crushing assembly comprises a first crushing roller and a second crushing roller horizontally arranged between the third support plate and the feed port, the first crushing roller and the second crushing roller are respectively connected to the box body through a first connecting shaft and a second connecting shaft, one end of each of the first connecting shaft and the second connecting shaft penetrates the rear end of the box body and extends into the driving assembly, two first cams are connected to the first connecting shaft, the two first cams are respectively matched with two second moving rods, the two first cams are respectively arranged in front of and behind the first crushing roller, and a guide plate is arranged below the secondary crushing assembly;

The guide plate is arranged with one end higher than the other end, the lower end of the guide plate is connected to the inner bottom surface of the discharge port, the higher end of the guide plate is located below the second crushing roller, and the bottom surface of the guide plate is evenly connected with a plurality of electromagnets for adsorbing iron filings;

The driving assembly includes a protective box connected to the rear end face of the box body, the protective box is equipped with a motor and a ninth driven gear, an eleventh driven gear, an eighth driven gear, and a seventh driven gear respectively installed on the first connecting shaft, the second connecting shaft, the third connecting shaft, and the fourth connecting shaft, the rear end face of the box body is connected to a fifth connecting shaft, the fifth connecting shaft is connected to the output end of the motor through a coupling, the fifth connecting shaft is connected to the first driving gear, one side of the first driving gear is meshed with the third driven gear, the third driven gear is keyed to the seventh connecting shaft, both ends of the seventh connecting shaft are respectively connected to the outer side of the box body and the inner wall of the protective box, the third driven gear is meshed with the ninth driven gear, the third driven gear is connected to the eleventh driven gear through the tenth driven gear, and the The tenth driven gear is keyed to the tenth connecting shaft, and the two ends of the tenth connecting shaft are respectively connected to the outer side of the box body and the inner wall of the protection box; the first driven gear is meshed with a first driven gear on the other side of the first driving gear, and the first driven gear is keyed to the sixth connecting shaft, and the two ends of the sixth connecting shaft are respectively connected to the outer side of the box body and the inner wall of the protection box, the first driven gear and the eighth driven gear are connected through a fifth driven gear, the fifth driven gear is keyed to the eighth connecting shaft, and the two ends of the eighth connecting shaft are respectively connected to the outer side of the box body and the inner wall of the protection box, the fifth driven gear and the seventh driven gear are connected through a sixth driven gear, the sixth driven gear is keyed to the ninth connecting shaft, and the two ends of the ninth connecting shaft are respectively connected to the outer side of the box body and the inner wall of the protection box;

The first driving gear is rotatably engaged with the fifth connecting shaft, and a conversion member cooperating with the first driving gear is slidably engaged with the fifth connecting shaft. The conversion member cooperates with the first driving gear so that the fifth connecting shaft can drive the first driving gear to rotate.

The above-mentioned crushing and screening device for construction engineering is adopted. When the device is in use, the device is set at a specified position, and then the building materials enter the box through the feed pipe and fall on the first screening plate inclined to screen the building materials. Smaller materials fall downward through the first screening hole, and the materials that have not passed through the first screening hole roll downward along the first screening plate. The materials rolling along the first screening plate fall between the third crushing roller and the fourth crushing roller. Under the operation of the driving component, the third crushing roller and the fourth crushing roller are driven to crush the materials. The crushed materials fall downward and fall on the secondary screening component arranged below the crushing component. When the primary screening component is working, the third connecting shaft can drive the second cam to rotate, so that the first moving rod cooperating with the second cam can swing up and down to avoid the materials being stuck in the first screening hole. The secondary screening component screens the materials crushed by the primary crushing component. If the crushed materials are of appropriate size, they can pass through the second screening hole. If the size is not appropriate, they roll along the second screening plate and fall below the second screening component. The secondary crushing assembly is used for secondary crushing. The secondary screening assembly can crush smaller materials that directly pass through the first screening hole, and can also crush materials guided by the second screening plate. During crushing, the first crushing roller and the second crushing roller are driven by the driving assembly to rotate to crush the materials. The crushed materials fall into the guide plate arranged below the secondary crushing assembly, and the first connecting shaft of the secondary crushing assembly can drive the first cam to rotate when the secondary crushing assembly is working. The rotation of the first cam can make the second moving rod matched with it move up and down, and the up and down movement of the second moving rod can drive the second screening plate to shake up and down, so as to avoid the material being stuck in the second screening hole. The inclined guide plate can guide the material falling on the guide plate to the discharge port. At the same time of guiding, a plurality of electromagnets arranged at the bottom of the guide plate can be started. By energizing and magnetizing the plurality of electromagnets, iron filings in the material can be adsorbed. When the material is crushed, the electromagnet can be powered off, and then the iron filings adsorbed on the guide plate can be guided to the discharge port along the guide plate.

Preferably, the conversion member is a circular ring structure, the inner wall of the conversion member is slidably engaged with the outer side of the fifth connecting shaft, a groove of an annular structure is provided on the outer side surface of the conversion member, and a plurality of positioning pins are connected to both end surfaces of the conversion member, and a plurality of positioning grooves are provided on the end surface of the first driving gear to cooperate with the plurality of positioning pins.

Preferably, the adjustment mechanism includes a second driving gear installed on the fifth connecting shaft, the second driving gear is rotatably engaged with the fifth connecting shaft, the conversion member is connected between the first driving gear and the second driving gear, the end surface of the second driving gear is also provided with a plurality of positioning grooves that cooperate with the positioning pin, the sixth connecting shaft is key-connected with a second driven gear that cooperates with the second driving gear, the seventh connecting shaft is key-connected with a fourth driven gear that cooperates with the second driving gear, the conversion member is provided with a fork assembly for driving it to move, the fork assembly includes a fork that cooperates with the groove, a connecting rod is vertically installed on the fork, a sliding rod is connected to the connecting rod, the sliding rod is rotatably engaged with the connecting rod, the sliding rod and the connecting rod are spliced to form an approximately "┌"-shaped structure, the sliding The unconnected end of the rod penetrates the protection box and is located behind the protection box, and a shift handle is vertically installed on one end of the sliding rod located on the outside of the protection box, and the shift handle and the sliding rod are spliced to form an approximately "┘"-shaped structure, and the sliding rod is a cylindrical structure, and a long strip-shaped adjustment block is connected to the rear end surface of the protection box, and the adjustment block is a quadrangular prism structure, and the length direction of the adjustment block is perpendicular to the rear end surface of the protection box. A slide groove of an approximately U-shaped structure is provided on the top surface of the adjustment block, and the length direction of the slide groove is parallel to the length direction of the adjustment block. Two notches are provided on one side of the adjustment block and are connected to the slide groove, and the two notches are a first gear and a second gear, and the first gear is set between the second gear and the rear end surface of the protection box, and the first gear and the second gear are both connected with a fixing component for fixing the shift handle;

The fixing assembly includes a second mounting groove on the inner side wall with a notch, a first mounting groove and the second mounting groove are formed on the outer side of the adjusting block, the second mounting groove and the first mounting groove are spliced to form an L-shaped structure, a bayonet for fixing the shift handle is connected in the second mounting groove, a pull plate is connected to one end of the bayonet, the pull plate passes through the first mounting groove and is located on the outer side of the adjusting block, and a third spring is connected between the pull plate and the second mounting groove.

Preferably, the second mounting groove is a quadrangular prism structure, the bayonet is a quadrangular prism structure, and an upper side of one end of the bayonet away from the pull plate is cut to form an inclined surface, and the inclined surface is arranged upward.

Preferably, abutment plates are connected to the two notches, and second springs are connected between the bottom surfaces of the two abutment plates and the bottom surfaces of the two notches.

Preferably, the feed pipe is a rectangular structure, and the feed pipe is tilted with one end higher than the other end, and the lower end of the feed pipe is connected to the feed port. The first dustproof component includes a dustproof plate arranged in the feed pipe, and the dustproof plate is vertically arranged. The dustproof plate is rotatably matched with the inner wall of the feed pipe, and a first spring is connected between the side of the dustproof plate away from the feed port and the top surface of the feed pipe.

Preferably, the discharge pipe is a rectangular structure, the discharge pipe is inclined with one end higher than the other end, the high end of the discharge pipe is connected to the discharge port, and the second dustproof component includes a plurality of protective strips, and the plurality of protective strips are all connected to the discharge pipe near the lower end.

Preferably, movable wheels are connected to the four corners of the bottom surface of the box body, and two observation windows are provided on the front end surface of the box body. The positions of the two observation windows correspond to the positions of the primary crushing assembly and the secondary crushing assembly respectively, and one side of the four movable wheels is connected to a pillar assembly with an adjustment function.

Preferably, the support column assembly comprises a first connecting plate connected to the bottom surface of the box body, the bottom surface of the first connecting plate is connected to a threaded rod, the outer side of the threaded rod is connected to a threaded tube, and the bottom surface of the threaded rod is connected to a first support plate.

Preferably, a nut is provided above the threaded tube, and the nut is connected to the outside of the threaded rod.

The beneficial effect is that the device can perform the first step of screening on the materials to be crushed by setting a first-level screening component, and screen out materials of different sizes. The larger materials are crushed into smaller materials by the first-level crushing component, and the smaller materials directly enter the second-level screening component through the first-level screening component for crushing. The materials crushed by the first-level crushing component are screened by the second-level screening component, and the materials of suitable size are discharged outwardly through the second-level screening component through the guide plate, and the unsuitable ones are further screened by the second-level screening component. Through the above steps, the device can process materials of different sizes separately when in use, thereby improving the screening effect, and can improve the screening efficiency, and can also increase the service life of the device; and a first dustproof component and a second dustproof component are also provided to prevent dust from being blown into and out of the material; and an adjustment component for enhancing torque is also provided, so that the device can increase torque when crushing harder materials, thereby better crushing and screening the materials, and can protect the motor.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

Fig. 1 is a front view of the present invention;

FIG2 is an enlarged view of portion A in FIG1 of the present invention;

Fig. 3 is a schematic structural diagram of the present invention;

FIG4 is a schematic diagram of the internal structure of the present invention;

Figure 5 is an enlarged view of portion D in Figure 4 of the present invention;

Figure 6 is a schematic diagram of the structure of the present invention;

Figure 7 is an enlarged view of portion B in Figure 6 of the present invention;

Figure 8 is a left view of the present invention;

Figure 9 is a schematic diagram of the structure of the crushing and screening assembly of the present invention;

Figure 10 is a schematic diagram of the structure of the crushing and screening assembly of the present invention;

Figure 11 is a schematic diagram of the structure of the crushing and screening assembly of the present invention;

Figure 12 is a schematic diagram of the drive assembly structure of the present invention;

Figure 13 is a schematic diagram of the fork assembly structure of the present invention;

Figure 14 is a schematic structural diagram of the conversion member of the present invention;

The following are the descriptions of the reference numerals:

1. Box body; 101. Observation window; 102. Feed pipe; 103. Discharge pipe; 104. Feed port; 105. Discharge port; 106. Protection strip; 107. Dust plate; 108. First spring; 2. Moving wheel; 3. Pillar assembly; 301. First connecting plate; 302. Threaded rod; 303. Threaded pipe; 304. First support plate; 305. Nut; 4. Protection box; 401. Through hole; 5. First screening plate; 501. First screening hole; 502. Second connecting plate; 503. First moving rod; 6. Second support plate; 7. Second screening plate; 701. Second screening hole; 702. Third connecting plate; 703. Second moving rod; 8. Secondary crushing assembly; 801. First crushing roller; 802. Second crushing roller; 803. First connecting shaft; 804. Second connecting shaft; 805. First cam; 9. Primary crushing assembly; 901. Third crushing roller; 902. Third connecting shaft; 903. Fourth crushing roller; 904. Fourth connecting shaft; 905. Second cam; 10. Third supporting plate; 11. Guide plate; 1101. Electromagnet; 12. Adjusting block; 1201, slide groove; 1202, notch; 1203, first mounting groove; 1204, second spring; 1205, butt plate; 1206, pull plate; 1207, second mounting groove; 1208, third spring; 1209, bayonet; 1210, first gear position; 1211, second gear position; 13, motor; 14, first driving gear; 15, second driving gear; 16, fifth connecting shaft; 17, sixth connecting shaft; 18, first driven gear; 19, second driven gear; 20, third driven gear; 21, fourth driven gear ; 22. Seventh connecting shaft; 23. Shift fork assembly; 2301. Shift fork; 2302. Connecting rod; 2303. Sliding rod; 2304. Shift handle; 24. Converter; 2401. Sliding block; 2402. Groove; 2403. Positioning pin; 25. Eighth connecting shaft; 26. Fifth driven gear; 27. Ninth connecting shaft; 28. Sixth driven gear; 29. Seventh driven gear; 30. Eighth driven gear; 31. Ninth driven gear; 32. Tenth driven gear; 33. Tenth connecting shaft; 34. Eleventh driven gear.

DETAILED DESCRIPTION

To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

Please refer to Figures 1 to 14. The present invention provides a crushing and screening device for construction engineering, including a box body 1. The box body 1 is a rectangular hollow structure. A feed port 104 is provided on one side of the box body 1 near the top, and a discharge port 105 is provided on the other side near the bottom. A feed pipe 102 is provided at the feed port 104, and a first dustproof component is provided in the feed pipe 102. The first dustproof component is provided to prevent dust generated during the crushing and screening of building materials from flying out from the feed pipe 102, which can effectively reduce pollution. A discharge pipe 103 is provided at the discharge port 105, and a second discharge pipe 103 is provided in the discharge pipe 103. Dust-proof component: The second dust-proof component arranged at the discharge pipe 103 is to reduce the dust generated during the discharge process and reduce air pollution. A multi-stage crushing component is arranged in the box body 1. A driving component for driving the crushing component is arranged on the rear end face of the box body 1. An adjusting mechanism for increasing the torque of the crushing component is arranged in the driving component. The adjusting structure is arranged to increase the torque of the crushing component so that the crushing component can crush harder materials, thereby avoiding damage to the driving component during the crushing process, thereby playing an effect of protecting the driving component. A multi-stage screening component with different screening diameters is also arranged in the box body 1;

The multi-stage crushing assembly is divided into a primary crushing assembly 9 and a secondary crushing assembly 8;

The multi-stage screening assembly is divided into a primary screening assembly and a secondary screening assembly;

The primary screening assembly, the primary crushing assembly 9, the secondary screening assembly, and the secondary crushing assembly 8 are all arranged in the box 1, and are arranged from top to bottom;

The primary screening assembly includes a first screening plate 5, which is tilted and arranged with one end higher than the other end. The high end of the first screening plate 5 is arranged near the feed port 104 and is rotatably matched with the inner wall of the box body 1. The low end of the first screening plate 5 is connected with a second connecting plate 502. The inner wall of the box body 1 is provided with a second supporting plate 6 for supporting the second connecting plate 502. The second supporting plate 6 is vertically arranged. A plurality of first screening holes 501 are evenly opened on the first screening plate 5. Two first moving rods 503 are connected to the second connecting plate 502. The two first moving rods 503 and the second connecting plate 502 are spliced to form an approximately U-shaped structure. The building materials enter the box body 1 through the feed pipe 102 and fall on the first screening plate 5 tilted to screen the building materials. Smaller materials fall downward through the first screening holes 501, and materials that have not passed through the first screening holes 501 roll downward along the first screening plate 5.

The primary crushing assembly 9 is arranged on the side of the second support plate 6 away from the feed port 104. The primary crushing assembly 9 includes a third crushing roller 901 and a fourth crushing roller 903 arranged horizontally. The third crushing roller 901 and the fourth crushing roller 903 cooperate to crush the building materials falling between the two. The third crushing roller 901 is arranged close to the second support plate 6. The third crushing roller 901 and the fourth crushing roller 903 are connected to the box body 1 through a third connecting shaft 902 and a fourth connecting shaft 904, respectively. One end of the third connecting shaft 902 and the fourth connecting shaft 904 penetrates the rear end surface of the box body 1 and extends into the driving assembly. Two second cams 905 are installed on the third connecting shaft 902. The two second cams 905 cooperate with the two first moving rods 503, respectively. The two second cams 90 5 are respectively arranged in front of and behind the third crushing roller 901, and a secondary screening assembly is arranged below the primary crushing assembly 9. The material rolling along the first screening plate 5 falls between the third crushing roller 901 and the fourth crushing roller 903, and the third crushing roller 901 and the fourth crushing roller 903 are driven by the driving assembly to crush the material. The crushed material falls downward and falls on the secondary screening assembly arranged below the crushing assembly 9. When the primary screening assembly 9 is working, the third connecting shaft 902 can drive the second cam 905 to rotate, so that the first moving rod 503 matched with the second cam 905 can swing up and down to prevent the material from being stuck in the first screening hole 501, thereby improving the screening efficiency of the primary screening assembly for materials of different sizes and improving the working capacity of the device;

The secondary screening assembly includes a second screening plate 7, which is tilted and arranged with one end high and the other end low. The high end of the second screening plate 7 is rotatably matched with the inner wall of the box body 1. The high end of the second screening plate 7 is located below the fourth crushing roller 903. The low end of the second screening plate 7 is connected to the third connecting plate 702. The box body 1 is provided with a third supporting plate 10 for supporting the third connecting plate 702. The third supporting plate 10 is vertically arranged. The third supporting plate 10 is located between the second supporting plate 6 and the feed port 104. The third connecting plate 702 is connected with two The second moving rod 703, the third connecting plate 702 and the two second moving rods 703 are spliced to form an approximately U-shaped structure. A plurality of second screening holes 701 are provided on the second screening plate 7. A secondary crushing assembly 8 is provided below the second screening plate 7. The secondary screening assembly screens the material crushed by the primary crushing assembly 9. If the size of the crushed material is appropriate, it can pass through the second screening holes 701. If the size is not appropriate, it rolls along the second screening plate 7 and falls on the secondary crushing assembly 8 provided below the second screening assembly for secondary crushing.

The secondary crushing assembly 8 includes a first crushing roller 801 and a second crushing roller 802 horizontally arranged between the third support plate 10 and the feed port 104. The first crushing roller 801 and the second crushing roller 802 are respectively connected to the box body 1 through a first connecting shaft 803 and a second connecting shaft 804. One end of the first connecting shaft 803 and the second connecting shaft 804 penetrates the rear end of the box body 1 and extends into the driving assembly. Two first cams 805 are connected to the first connecting shaft 803. The two first cams 805 are respectively matched with the two second moving rods 703. The two first cams 805 are respectively arranged in front of and behind the first crushing roller 801. A guide plate 11 is arranged below the secondary crushing assembly 8. The secondary screening assembly 8 can directly pass through the first screening hole 501. The first crushing roller 801 and the second crushing roller 802 are driven by the driving assembly to rotate and crush the materials. The crushed materials fall onto the guide plate 11 arranged below the secondary crushing assembly 8, and the first connecting shaft 803 of the secondary crushing assembly 8 can drive the first cam 805 to rotate when the secondary crushing assembly 8 is working. The rotation of the first cam 805 can make the second moving rod 703 matched with it move up and down. The up and down movement of the second moving rod 703 can drive the second screening plate 7 to shake up and down, so as to avoid the material being stuck in the second screening hole 701, thereby improving the screening efficiency of the secondary screening assembly and further improving the working efficiency of the device;

The guide plate 11 is tilted so that one end is higher than the other end. The lower end of the guide plate 11 is connected to the inner bottom surface of the discharge port 105. The higher end of the guide plate 11 is located below the second crushing roller 802. A plurality of electromagnets 1101 for adsorbing iron filings are evenly connected to the bottom surface of the guide plate 11. The material falling on the guide plate 11 can be guided to the discharge port 105 by the tilted guide plate 11. While guiding the material, the plurality of electromagnets 1101 arranged at the bottom of the guide plate 11 can be started. The plurality of electromagnets 1101 are energized and magnetized to adsorb the iron filings in the material. When the material is crushed, the electromagnet 1101 can be powered off, and then the iron filings adsorbed on the guide plate 11 can be guided to the discharge port 105 along the guide plate 11.

The driving assembly includes a protective box 4 connected to the rear end face of the box body 1, on which a motor 13 and a ninth driven gear 31, an eleventh driven gear 34, an eighth driven gear 30 and a seventh driven gear 29 are installed respectively on the first connecting shaft 803, the second connecting shaft 804, the third connecting shaft 902 and the fourth connecting shaft 904, a fifth connecting shaft 16 is connected to the rear end face of the box body 1, the fifth connecting shaft 16 is connected to the output end of the motor 13 through a coupling, the fifth connecting shaft 16 is connected to the first driving gear 14, one side of the first driving gear 14 is meshed with the third driven gear 20, the third driven gear 20 is key-connected to the seventh connecting shaft 22, both ends of the seventh connecting shaft 22 are respectively connected to the outer side of the box body 1 and the inner wall of the protective box 4, the third driven gear 20 is meshed with the ninth driven gear 31, and the third driven gear 20 is connected to the eleventh driven gear 34 through the tenth driven gear 3 2 is connected, the tenth driven gear 32 is key-connected to the tenth connecting shaft, and the two ends of the tenth connecting shaft are respectively connected to the outer side of the box body 1 and the inner wall of the protection box 4; the first driving gear 14 is meshed with a first driven gear 18 on the other side, and the first driven gear 18 is key-connected to the sixth connecting shaft 17, and the two ends of the sixth connecting shaft 17 are respectively connected to the outer side of the box body 1 and the inner wall of the protection box 4, the first driven gear 18 and the eighth driven gear 30 are connected through the fifth driven gear 26, the fifth driven gear 26 is key-connected to the eighth connecting shaft 25, and the two ends of the eighth connecting shaft 25 are respectively connected to the outer side of the box body 1 and the inner wall of the protection box 4, the fifth driven gear 26 and the seventh driven gear 29 are connected through the sixth driven gear 28, the sixth driven gear 28 is key-connected to the ninth connecting shaft 27, and the two ends of the ninth connecting shaft 27 are respectively connected to the outer side of the box body 1 and the inner wall of the protection box 4;

The first driving gear 14 is rotatably engaged with the fifth connecting shaft 16, and a conversion member 24 cooperating with the first driving gear 14 is slidably engaged with the fifth connecting shaft 16. The conversion member 24 cooperates with the first driving gear 14 to enable the fifth connecting shaft 16 to drive the first driving gear 14 to rotate. The motor 13 drives the fifth connecting shaft 16 to rotate. The conversion member 24 cooperates with the first driving gear 14 to enable the fifth connecting shaft 16 to drive the first driving gear 14 to rotate. The first driving gear 14 cooperates with the first driven gear 18 and the third driven gear 20 to rotate. The first driven gear 18 drives the eighth driven gear 30 to rotate through the fifth driven gear 26, so that the third connecting shaft 902 rotates, and the third crushing roller 901 can be further driven to rotate. The fifth driven gear 26 drives the eighth driven gear 30 to rotate. While the driven gear 26 is rotating, it drives the seventh driven gear 29 to rotate through the sixth driven gear 28, thereby rotating the fourth connecting shaft, and then the fourth crushing roller 903 can be rotated. The rotation direction of the third crushing roller 901 and the fourth crushing roller 903 are both inward. Similarly, the third driven gear 20 is rotated to drive the ninth driven gear 31 to rotate, and the first connecting shaft 803 is further driven by the ninth driven gear 31 to rotate. Then the third driven gear 20 drives the eleventh driven gear 34 to rotate through the tenth driven gear 32, thereby driving the second connecting shaft 804 to rotate. The rotation of the first connecting shaft 803 and the second connecting shaft 804 can make the rotation direction of the first crushing roller 801 and the second crushing roller 802 both rotate inward. The rotation direction is shown by the arrow in Figure 12.

As an optional embodiment, the conversion member 24 is a circular ring structure, the inner wall of the conversion member 24 is slidably engaged with the outer side of the fifth connecting shaft 16, a groove 2402 of an annular structure is provided on the outer side surface of the conversion member 24, and multiple positioning pins 2403 are connected to both end surfaces of the conversion member 24, and multiple positioning grooves are provided on the end surface of the first driving gear 14 to cooperate with the multiple positioning pins 2403. The adjusting mechanism includes a second driving gear 15 installed on the fifth connecting shaft 16, the second driving gear 15 is rotatably engaged with the fifth connecting shaft 16, a conversion member 24 is connected between the first driving gear 14 and the second driving gear 15, and a plurality of positioning grooves cooperating with the positioning pins 2403 are also provided on the end surface of the second driving gear 15, a second driven gear 19 cooperating with the second driving gear 15 is keyed to the sixth connecting shaft 17, and a fourth driven gear 21 cooperating with the second driving gear 15 is keyed to the seventh connecting shaft 22. When the conversion member 24 cooperates with the second driving gear 15, the second driven gear 19 and the fourth driven gear 21 can be driven to rotate through the second driving gear 15, thereby forming a state in which the small gear drives the large gear to rotate, thereby achieving a torque-increasing effect. When the second driven gear 19 and the fourth driven gear 21 rotate, the sixth connecting shaft 17 and the seventh connecting shaft 22 can be driven to rotate, thereby driving the primary crushing assembly 9 according to the above description. As well as the secondary crushing assembly 8 rotating work, since the first driving gear 14 and the second driving gear 15 are both rotatably connected with the fifth connecting shaft 16, the fifth connecting shaft 16 cannot drive them to rotate without the cooperation of the conversion member 24; a fork assembly 23 for driving its movement is provided on the conversion member 24, and the fork assembly 23 includes a fork 2301 matched with the groove 2402, a connecting rod 2302 is vertically installed on the fork 2301, and a sliding rod 230 is connected to the connecting rod 2302 3. The sliding rod 2303 is rotatably connected with the connecting rod 2302. The sliding rod 2303 and the connecting rod 2302 are spliced to form a structure approximately in the shape of "┌". The unconnected end of the sliding rod 2303 penetrates the protection box 4 and is located behind the protection box 4. A shift handle 2304 is vertically installed on one end of the sliding rod 2303 located outside the protection box 4. The shift handle 2304 and the sliding rod 2303 are spliced to form a structure approximately in the shape of "┘". The sliding rod 2303 is a cylindrical structure. When in use, the shift handle 2304 is pulled 04 can drive the sliding rod 2303 to move back and forth, so that the connecting rod 2302 can drive the shift fork 2301 to move back and forth, and further the shift fork 2301 can drive the conversion member 24 to move back and forth to cooperate with the first driving gear 14 or the second driving gear 15; the rear end surface of the protection box 4 is connected with a long strip-shaped adjustment block 12, the adjustment block 12 is a quadrangular prism structure, the length direction of the adjustment block 12 is perpendicular to the rear end surface of the protection box 4, and the top surface of the adjustment block 12 is provided with a sliding block with an approximately U-shaped structure The length direction of the slide groove 1201 is parallel to the length direction of the adjustment block 12. Two notches 1202 are provided on one side of the adjustment block 12 to communicate with the slide groove 1201. The two notches 1202 are the first gear position 1210 and the second gear position 1211. The first gear position 1210 is arranged between the second gear position 1211 and the rear end surface of the protection box 4. When the shift handle 2304 is located in the first gear position 1210, the conversion member 24 cooperates with the first driving gear 14. When the shift handle 2304 is located in the first gear position 1210, the conversion member 24 cooperates with the first driving gear 14. When the adjusting block 12 is in the second gear position 1211, the conversion member 24 cooperates with the second driving gear 15; a fixing assembly for fixing the shift handle 2304 is connected in both the first gear position 1210 and the second gear position 1211; the fixing assembly includes a second mounting groove 1207 on the inner side wall of the notch 1202, a first mounting groove 1203 is formed on the outer side of the adjusting block 12 and communicates with the second mounting groove 1207, the second mounting groove 1207 is spliced with the first mounting groove 1203 to form an L-shaped structure, and the second mounting groove 1207 is connected to the first mounting groove 1203. A pin 1209 for fixing the shift handle 2304 is connected in the groove 1207, and a pull plate 1206 is connected to one end of the pin 1209. The pull plate 1206 passes through the first mounting groove 1203 and is located on the outside of the adjustment block 12. A third spring 1208 is connected between the pull plate 1206 and the second mounting groove 1203. The second mounting groove 1207 is a quadrangular prism structure, and the pin 1209 is a quadrangular prism structure. An end of the pin 1209 away from the pull plate 1206 is cut to form an inclined surface, and the inclined surface is set upward. When the shift handle 2304 is pulled to cooperate with the first gear position 1210, the shift handle 2304 is flipped and snapped into the first gear position 1210. When snapped into the first gear position 1210, the shift handle 2304 pushes the bayonet pin 1209 back into the second mounting groove 1207 along the inclined surface of the bayonet pin 1209. When the shift handle 2304 is lower than the bayonet pin 1209, the bayonet pin 1209 pops out under the action of the third spring 1208, and the shift handle 2304 is jammed, and the shift handle 2304 cannot be rotated. The same is true for cooperation with the second gear position 1211. A support plate 1205 is connected to each of the two notches 1202, and a second spring 1204 is connected between the bottom surface of the two support plates 1205 and the bottom surface of the two notches 1202. When the gear position needs to be changed, the pull plate 1206 is pulled so that the pin 1209 is located in the second mounting groove 1207. At this time, the shift handle 2304 pops out from the gear position under the action of the second spring 1204, and then the shift handle 2304 is pulled to operate.

The feed pipe 102 is a rectangular structure, and the feed pipe 102 is tilted with one end high and the other end low. The lower end of the feed pipe 102 is connected to the feed port 104. The first dustproof component includes a dustproof plate 107 arranged in the feed pipe 102, and the dustproof plate 107 is arranged vertically. The dustproof plate 107 is rotatably matched with the inner wall of the feed pipe 102. A first spring 108 is connected between the side of the dustproof plate 107 away from the feed port 104 and the top surface of the feed pipe 102. Through the dustproof plate 107 and the first spring 108 arranged in the feed pipe 102, when the object When the material enters the feed port 104 from the feed pipe 102, the material overcomes the elastic force of the first spring 108 under the action of the inclined feed pipe 102 to push open the dustproof plate 107 and enter the box body 1. When the material no longer enters the box body 1, the dustproof plate 107 returns to its original position under the action of the spring. Since the dustproof plate 107 is vertically arranged and the feed pipe 102 is inclined, the inner bottom surface of the feed pipe 102 can serve as a limit for the dustproof plate 107, ensuring that it returns to its original position and can effectively seal the feed pipe 102.

The discharge pipe 103 is a rectangular structure, and the discharge pipe 103 is tilted with one end higher than the other end. The high end of the discharge pipe 103 is connected to the discharge port 105. The second dustproof component includes a plurality of protective strips 106. The plurality of protective strips 106 are all connected to the discharge pipe 103 near the lower end. By setting the protective strips 106, the material discharged outward through the discharge port 105 can prevent dust from flying out of the discharge pipe 103. The protective strips 106 are made of rubber.

The four corners of the bottom of the box body 1 are connected to moving wheels 2. The front face of the box body 1 is provided with two observation windows 101. The positions of the two observation windows 101 correspond to the positions of the primary crushing assembly and the secondary crushing assembly respectively. One side of the four moving wheels 2 is connected to a support assembly 3 with an adjustment function. The four moving wheels 2 are provided to make the device more convenient to move and easier to use.

The support assembly 3 includes a first connecting plate 301 connected to the bottom surface of the box body 1, a threaded rod 302 is connected to the bottom surface of the first connecting plate 301, a threaded tube 303 is connected to the outside of the threaded rod 302, and a first support plate 304 is connected to the bottom surface of the threaded rod 302. A nut 305 is arranged above the threaded tube 303, and the nut 305 is connected to the outside of the threaded rod 302. The nut 305 is arranged above the threaded tube 303 so that after the distance between the first support plate 304 and the bottom surface of the box body 1 is adjusted appropriately by rotating the threaded tube 303, by rotating the nut 305 close to the top of the threaded tube 303, the threaded tube 303 can be prevented from being reversed, thereby reducing the distance between the first support plate 304 and the box body 1, making it more stable to use.

With the above structure, when the device is in use, the device is set at a designated position, and then the building materials enter the box body 1 through the feed pipe 102, and fall on the first screening plate 5 arranged obliquely to screen the building materials. Smaller materials fall downward through the first screening hole 501, and the materials that have not passed through the first screening hole 501 roll downward along the first screening plate 5. The materials rolling along the first screening plate 5 fall between the third crushing roller 901 and the fourth crushing roller 903. Under the operation of the driving component, the third crushing roller 901 and the fourth crushing roller 903 are driven to crush the materials. The crushed materials fall downward and fall on The second screening assembly is arranged on the second screening assembly below the crushing assembly 9, and when the first screening assembly 9 is working, the third connecting shaft 902 can drive the second cam 905 to rotate, so that the first moving rod 503 matched with the second cam 905 can swing up and down to prevent the material from being stuck in the first screening hole 501. The second screening assembly screens the material crushed by the first crushing assembly 9. If the size of the crushed material is appropriate, it can pass through the second screening hole 701. If the size is not appropriate, it rolls along the second screening plate 7 and falls on the second crushing assembly 8 arranged below the second screening assembly for secondary screening. The secondary screening assembly 8 can crush the smaller materials that directly pass through the first screening hole 501, and can also crush the materials guided by the second screening plate 7. During the crushing, the first crushing roller 801 and the second crushing roller 802 are driven by the driving assembly to rotate and crush the materials. The crushed materials fall onto the guide plate 11 arranged below the secondary crushing assembly 8. When the secondary crushing assembly 8 is working, the first connecting shaft 803 can drive the first cam 805 to rotate. The rotation of the first cam 805 can make the second moving rod 703 matched with it move up and down. The up and down movement of the second moving rod 703 can drive the second screening plate 7 to swing up and down, thereby preventing the material from getting stuck in the second screening hole 701. The inclined material guide plate 11 can guide the material falling on the material guide plate 11 to the discharge port 105. At the same time, the multiple electromagnets 1101 set at the bottom of the material guide plate 11 can be started. By energizing and magnetizing the multiple electromagnets 1101, iron filings in the material can be adsorbed. When the material is crushed, the electromagnet 1101 can be de-energized, and then the iron filings adsorbed on the material guide plate 11 can be guided along the material guide plate 11 to the discharge port 105.

The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (10)

1. The utility model provides a crushing screening plant for building engineering which characterized in that: the novel dust-proof box comprises a box body (1), wherein the box body (1) is of a rectangular hollow structure, a feeding hole (104) is formed in one side surface of the box body (1) close to the top, a discharging hole (105) is formed in the other side surface of the box body close to the bottom, a feeding pipe (102) is arranged at the feeding hole (104), a first dust-proof component is arranged in the feeding pipe (102), a discharging pipe (103) is arranged at the discharging hole (105), a second dust-proof component is arranged in the discharging pipe (103), a multistage crushing component is arranged in the box body (1), a driving component for driving the crushing component to work is arranged on the rear end surface of the box body (1), an adjusting mechanism for increasing the torque of the crushing component is arranged in the driving component, and multistage screening components with different screening diameters are further arranged in the box body (1).

The multistage crushing assembly is divided into a first stage crushing assembly (9) and a second stage crushing assembly (8);

the multi-stage screening assembly is divided into a first-stage screening assembly and a second-stage screening assembly;

the primary screening component, the primary crushing component (9), the secondary screening component and the secondary crushing component (8) are all arranged in the box body (1) and are arranged from top to bottom;

the first-stage screening assembly comprises a first screening plate (5), the first screening plate (5) is provided with a plurality of first screening holes (501) with one end being high and the other end being low, the high end of the first screening plate (5) is close to the feeding hole (104) and is in running fit with the inner wall of the box body (1), the low end of the first screening plate (5) is connected with a second connecting plate (502), the inner wall of the box body (1) is provided with a second supporting plate (6) for supporting the second connecting plate (502), the second supporting plate (6) is vertically arranged, a plurality of first screening holes (501) are uniformly formed in the first screening plate (5), two first moving rods (503) are connected to the second connecting plate (502), and the two first moving rods (503) and the second connecting plate (502) are spliced to form an approximate U-shaped structure;

The first-stage crushing assembly (9) is arranged on one side, far away from the feeding hole (104), of the second supporting plate (6), the first-stage crushing assembly (9) comprises a third crushing roller (901) and a fourth crushing roller (903) which are horizontally arranged, building materials falling between the third crushing roller (901) and the fourth crushing roller (903) can be crushed through matching of the third crushing roller (901) and the fourth crushing roller (903), the third crushing roller (901) is close to the second supporting plate (6), the third crushing roller (901) and the fourth crushing roller (903) are connected with the box (1) through a third connecting shaft (902) and a fourth connecting shaft (904), one ends of the third connecting shaft (902) and the fourth connecting shaft (904) penetrate through the rear end face of the box (1) and extend into the driving assembly, two second cams (905) are mounted on the third connecting shaft (902), the two second cams (905) are matched with the two first moving rods (503), and the two second cams (905) are arranged behind the first-stage crushing assembly (9) and behind the second-stage crushing assembly;

The secondary screening assembly comprises a second screening plate (7), the second screening plate (7) is arranged with one end being high and one end being low in an inclined manner, the high end of the second screening plate (7) is in running fit with the inner wall of the box body (1), the high end of the second screening plate (7) is located below the fourth crushing roller (903), a third connecting plate (702) is connected to the low end of the second screening plate (7), a third supporting plate (10) for supporting the third connecting plate (702) is arranged on the box body (1), the third supporting plate (10) is vertically arranged, the third supporting plate (10) is located between the second supporting plate (6) and the feeding hole (104), two second moving rods (703) are connected to the third connecting plate (702), a plurality of second screening holes (701) are formed in the second screening plate (7) in a spliced mode, and the lower portion of the second screening plate (7) is provided with a secondary screening assembly (8);

The secondary crushing assembly (8) comprises a first crushing roller (801) and a second crushing roller (802) which are horizontally arranged between a third supporting plate (10) and a feed inlet (104), the first crushing roller (801) and the second crushing roller (802) are respectively connected with the box body (1) through a first connecting shaft (803) and a second connecting shaft (804), one ends of the first connecting shaft (803) and the second connecting shaft (804) penetrate through the rear end of the box body (1) and extend into the driving assembly, two first cams (805) are connected to the first connecting shaft (803), the two first cams (805) are respectively matched with two second moving rods (703), the two first cams (805) are respectively arranged in front of and behind the first crushing roller (801), and a guide plate (11) is arranged below the secondary crushing assembly (8);

The material guide plate (11) is arranged with one high end and one low end in an inclined manner, the low end of the material guide plate (11) is connected with the inner bottom surface of the material outlet (105), the high end of the material guide plate (11) is positioned below the second crushing roller (802), and the bottom surface of the material guide plate (11) is uniformly connected with a plurality of electromagnets (1101) for absorbing scrap iron;

The driving assembly comprises a protective box (4) connected with the rear end face of the box body (1), a motor (13) and a ninth driven gear (31), an eleventh driven gear (34), an eighth driven gear (30) and a seventh driven gear (29) which are respectively arranged on a first connecting shaft (803), a second connecting shaft (804), a third connecting shaft (902) and a fourth connecting shaft (904) are arranged on the protective box (4), the rear end face of the box body (1) is connected with a fifth connecting shaft (16), the fifth connecting shaft (16) is connected with the output end of the motor (13) through a coupler, a first driving gear (14) is connected on the fifth connecting shaft (16), a third driven gear (20) is meshed on one side of the first driving gear (14), the third driven gear (20) is connected on the seventh connecting shaft (22) in a key manner, two ends of the seventh connecting shaft (22) are respectively connected with the outer side of the box body (1) and the inner wall of the protective box (4), the third driven gear (20) is meshed with the tenth driven gear (32) through the tenth driven gear (32), the two ends of the tenth connecting shaft are respectively connected with the outer side of the box body (1) and the inner wall of the protective box (4); the novel automatic transmission device is characterized in that a first driven gear (18) is meshed with the other side of the first driving gear (14), the first driven gear (18) is connected to a sixth connecting shaft (17) in a key manner, two ends of the sixth connecting shaft (17) are connected with the outer side of the box body (1) and the inner wall of the protection box (4) respectively, the first driven gear (18) is connected with the eighth driven gear (30) through a fifth driven gear (26), the fifth driven gear (26) is connected to an eighth connecting shaft (25) in a key manner, two ends of the eighth connecting shaft (25) are connected with the outer side of the box body (1) and the inner wall of the protection box (4) respectively, the fifth driven gear (26) is connected with the seventh driven gear (29) through a sixth driven gear (28), the sixth driven gear (28) is connected to a ninth connecting shaft (27) in a key manner, and two ends of the ninth connecting shaft (27) are connected with the outer side of the box body (1) and the inner wall of the protection box (4) respectively;

The first driving gear (14) is rotationally clamped with the fifth connecting shaft (16), a conversion piece (24) matched with the first driving gear (14) is slidably clamped on the fifth connecting shaft (16), and the fifth connecting shaft (16) can drive the first driving gear (14) to rotate through the cooperation of the conversion piece (24) and the first driving gear (14).

2. The crushing and screening device for construction engineering according to claim 1, wherein: the conversion piece (24) is of a circular ring structure, the inner wall of the conversion piece (24) is in sliding clamping connection with the outer side of the fifth connecting shaft (16), a groove (2402) of a circular structure is formed in the outer side face of the conversion piece (24), a plurality of locating pins (2403) are connected to two end faces of the conversion piece (24), and a plurality of locating grooves are formed in the end face of the first driving gear (14) to be matched with the locating pins (2403).

3. A crushing and screening device for construction engineering according to claim 2, characterized in that: the adjusting mechanism comprises a second driving gear (15) arranged on a fifth connecting shaft (16), the second driving gear (15) is rotationally clamped with the fifth connecting shaft (16), the conversion piece (24) is connected between the first driving gear (14) and the second driving gear (15), a plurality of positioning grooves matched with the positioning pins (2403) are also formed in the end face of the second driving gear (15), a second driven gear (19) matched with the second driving gear (15) is connected on the sixth connecting shaft (17) in a key way, a fourth driven gear (21) matched with the second driving gear (15) is connected on the seventh connecting shaft (22) in a key way, a shifting fork assembly (23) for driving the conversion piece to move is arranged on the conversion piece (24), the shifting fork assembly (23) comprises a connecting rod (2301) matched with the groove (2402), the connecting rod (2302) is vertically arranged on the shifting fork (2301), the connecting rod (2302) is connected with the connecting rod (2302) in a sliding mode, the connecting rod (2303) is connected with the connecting rod (2303) in a sliding mode, and the connecting rod (2303) is approximately connected with the sliding box (2304) in a sliding mode, and the sliding box (2304) is connected with the connecting rod (2303), a gear shifting handle (2304) is vertically arranged at one end of the sliding rod (2303) positioned at the outer side of the protective box (4), the gear shifting handle (2304) is spliced with the sliding rod (2303) to form an approximately 'shape', the sliding rod (2303) is of a cylindrical structure, an adjusting block (12) which is in a strip shape is connected to the rear end surface of the protective box (4), the adjusting block (12) is of a quadrangular structure, the length direction of the adjusting block (12) is perpendicular to the rear end surface of the protective box (4), a sliding groove (1201) which is approximately in a U-shaped structure is formed in the top surface of the adjusting block (12), the length direction of the sliding groove (1201) is parallel to the length direction of the adjusting block (12), two notches (1202) are formed in one side surface of the adjusting block (12) and are communicated with the sliding groove (1201), the two notches (1202) are a first gear (1210) and a second gear (1211), the first gear (1210) is arranged between the second gear (1211) and the second gear shifting handle (1211) is fixedly connected to the gear shifting assembly (2304);

The fixed subassembly is including seting up second mounting groove (1207) on breach (1202) inside wall, first mounting groove (1203) are seted up in regulating block (12) outside with second mounting groove (1207) together with, second mounting groove (1207) with first mounting groove (1203) concatenation forms L shape structure, second mounting groove (1207) in-connection has bayonet lock (1209) that are used for fixed gear shifting handle (2304), be connected with arm-tie (1206) on bayonet lock (1209) one end, arm-tie (1206) pass first mounting groove (1203) are located regulating block (12) outside, arm-tie (1206) with be connected with third spring (1208) between second mounting groove (1207).

4. A crushing and screening device for construction projects according to claim 3, characterized in that: the second mounting groove (1207) is of a quadrangular structure, the clamping pin (1209) is of a quadrangular structure, an inclined surface is formed by cutting the upper side of one end, far away from the pull plate (1206), of the clamping pin (1209), and the inclined surface is upwards arranged.

5. A crushing and screening device for construction projects according to claim 3, characterized in that: and a retaining plate (1205) is connected in each notch (1202), and a second spring (1204) is connected between the bottom surfaces of the two retaining plates (1205) and the inner bottom surfaces of the two notches (1202).

6. The crushing and screening device for construction engineering according to claim 1, wherein: inlet pipe (102) are rectangular structure, inlet pipe (102) are the high low slope setting of one end, the low end of inlet pipe (102) with feed inlet (104) are connected, first dustproof subassembly is including setting up dust guard (107) in inlet pipe (102), dust guard (107) are vertical to be set up, dust guard (107) with inlet pipe (102) inner wall normal running fit, dust guard (107) are kept away from one side of feed inlet (104) with be connected with first spring (108) between the interior top surface of inlet pipe (102).

7. The crushing and screening device for construction engineering according to claim 1, wherein: the discharging pipe (103) is of a rectangular structure, the discharging pipe (103) is arranged in a mode that one end of the discharging pipe is high, the other end of the discharging pipe (103) is inclined low, the high end of the discharging pipe is connected with the discharging hole (105), the second dustproof component comprises a plurality of protection strips, and the protection strips are connected in the discharging pipe (103) and close to the low end.

8. The crushing and screening device for construction engineering according to claim 1, wherein: the novel crushing device comprises a box body (1), wherein moving wheels (2) are connected to four corners of the bottom surface of the box body (1), two observation windows (101) are arranged on the front end surface of the box body (1), the positions of the two observation windows (101) are respectively corresponding to the positions of a primary crushing assembly and a secondary crushing assembly, and strut assemblies (3) with adjusting functions are connected to one sides of the moving wheels (2).

9. The crushing and screening device for construction engineering according to claim 8, wherein: the support column assembly (3) comprises a first connecting plate (301) connected to the bottom surface of the box body (1), a threaded rod (302) is connected to the bottom surface of the first connecting plate (301), a threaded pipe (303) is connected to the outer side of the threaded rod (302), and a first supporting plate (304) is connected to the bottom surface of the threaded rod (302).

10. The crushing and screening device for construction engineering according to claim 9, wherein: a nut (305) is arranged above the threaded pipe (303), and the nut (305) is connected to the outer side of the threaded rod (302).