CN114009977B

CN114009977B - Portable drawing show shelf for building engineering

Info

Publication number: CN114009977B
Application number: CN202111213124.4A
Authority: CN
Inventors: 何毅
Original assignee: Individual
Current assignee: Li Heng
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2023-05-09
Anticipated expiration: 2041-10-19
Also published as: CN114009977A

Abstract

The invention relates to a display rack, in particular to a portable drawing display rack for construction engineering. The invention provides a portable drawing showing stand for construction engineering, which can automatically shade rain, automatically show drawings and automatically show pens. The utility model provides a building engineering is with portable drawing show shelf, including toper post, the roating seat, the handle, the spiral spring, the dwang, the show drawing, a support, a sliding sleeve, the sliding block, a sliding rod, supporting mechanism and pulling mechanism, toper post upper portion is equipped with the roating seat, be equipped with the handle on the roating seat, the rotation is equipped with the dwang on the roating seat, the dwang lower part winds has the spiral spring, spiral spring coupling is between roating seat and dwang, around having the show drawing on the dwang, the handle lower part is equipped with a support. According to the invention, the pulling mechanism is arranged, and the supporting mechanism operates to drive the pulling mechanism to operate, so that the display drawing is pulled out, and the effect of automatic paper output display is achieved.

Description

Portable drawing show shelf for building engineering

Technical Field

The invention relates to a display rack, in particular to a portable drawing display rack for construction engineering.

Background

When the engineering is finished, quality inspection and acceptance are required according to the design requirement of the engineering drawing, and the quality of the engineering is evaluated, so that the basis of the project general calculation, the budget and the decision and the auditing engineering cost is compiled, the building engineering drawing display rack is an important tool for people to see, the drawing is easy to wet when the existing engineering drawing display rack is used in overcast and rainy days, the drawing is required to be flattened manually in the use process of the existing engineering drawing display rack, and in addition, the existing display rack is inconvenient for people to pick and place pens, so that the use steps of the engineering drawing display rack are more complicated, and the usability of the building engineering drawing display rack is affected.

Patent application CN209677872U, the publication day is 2019.11.26, disclose a project drawing show shelf for building construction, including the fixed plate, the universal wheel, stabilising arrangement, buckle device, the fixture block, the fixed block, the show board, the commentaries on classics pipe, the slide bar, clip, slide rail and wind device etc. at first people remove the show shelf to corresponding position, secondly compress winding device downwards and take out winding device, then with the project drawing scroll in winding device's outside, with winding device card in one side of show board, then fasten with clip footpath one side of project drawing, shake the bottom of commentaries on classics pipe with the stretching of clip with one side, rotatory rotary drum drives the middle part gathering of card axial rotary drum, then with the show board lifting to corresponding height, reverse rotation rotary drum makes one side of clamping axle press from both sides the lifter can, however the device can not automatic rain-proof.

Therefore, there is a need to design a portable drawing showing stand for construction engineering, which can automatically hide rain, automatically show drawings and automatically show pens.

Disclosure of Invention

The invention aims to overcome the defects that the existing drawing showing stand cannot automatically shade rain and cannot automatically output paper and take and put pens, and provides a portable drawing showing stand for construction engineering, which can automatically shade rain, automatically display drawings and automatically output pens.

The invention adopts the following technical scheme:

the utility model provides a building engineering is with portable drawing show shelf, including the toper post, the roating seat, the handle, the volute spring, the rotor, the show drawing, a first support, a first sliding sleeve, the sliding block, first slide bar, supporting mechanism and pulling mechanism, toper post upper portion is equipped with the roating seat, be equipped with the handle on the roating seat, the rotation is equipped with the rotor on the roating seat, the rotor lower part winds there is the volute spring, volute spring connects between roating seat and rotor, around there being the show drawing on the rotor, the handle lower part is equipped with a support, a support upper portion inboard slidingtype is equipped with a sliding sleeve, a sliding sleeve inboard slidingtype is equipped with the sliding block, be equipped with first slide bar on the sliding block, be equipped with supporting mechanism on the toper post, supporting mechanism is connected with the roating seat, be equipped with pulling mechanism on the roating seat, pulling mechanism is connected with supporting mechanism and first slide bar.

Preferably, the second sliding sleeve is arranged on the conical column in a sliding manner, six second brackets are arranged on the second sliding sleeve and the rotating seat, swing rods are connected between three adjacent second brackets on the lower side in a rotating manner, first swing blocks are connected between three adjacent second brackets on the upper side in a rotating manner, the first swing blocks are connected with the swing rods in a rotating manner, and a first spring is wound on the conical column and connected between the rotating seat and the second sliding sleeve.

Preferably, a third support is arranged on the second sliding sleeve, a third sliding sleeve is arranged on the rotating seat, a pushing block is arranged on the inner side of the third sliding sleeve in a sliding mode, a second spring is wound on the lower portion of the pushing block, the second spring is connected between the pushing block and the third sliding sleeve, a fourth support is arranged on the rotating seat, a rotating block is rotatably arranged on the fourth support, the rotating block is slidably connected with the pushing block, a second swinging block is arranged on the rotating block, a fourth sliding sleeve is slidably arranged on the first sliding rod, the fourth sliding sleeve is rotatably connected with the second swinging block, a fifth support is arranged on the third sliding sleeve, a winding wheel is rotatably arranged on the inner side of the upper portion of the fifth support, a first torsion spring is wound on the rotating block, the first torsion spring is connected between the fourth support and the second swinging block, a pull rope is connected between the third support and the pushing block, and the pull rope bypasses the winding wheel.

Preferably, the rotary seat top is equipped with the installation piece, and the inboard rotation of installation piece is equipped with first pivot, winds in the first pivot and has two second torsion springs, and second torsion spring connects between installation piece and first pivot, and first slide bar top is equipped with the supporting shoe, winds in the first pivot and has shielding cloth, and shielding cloth is connected with the supporting shoe.

Preferably, a fifth sliding sleeve is arranged on the mounting block, two second sliding rods are arranged on the inner side of the fifth sliding sleeve in a sliding mode, a cleaning block is connected between the bottoms of the two second sliding rods, the cleaning block is connected with shielding cloth in a sliding mode, a compression spring is wound on the second sliding rod, and the compression spring is connected between the second sliding rods and the fifth sliding sleeve.

Preferably, the rotating seat is provided with a sixth support, the inner side of the sixth support is provided with a storage box, the bottom of the storage box is provided with two seventh supports, a second rotating shaft is rotatably connected between the two seventh supports, a cover plate is arranged in the middle of the second rotating shaft and matched with the storage box, a third torsion spring is wound on the second rotating shaft and connected between the second rotating shaft and the seventh support, a sliding block is arranged on the inner side of the storage box in a sliding mode, and a third spring is connected between the sliding block and the storage box.

Preferably, the sliding block is provided with a contact block, the second rotating shaft is provided with a touch block, the contact block is matched with the touch block, the storage box is provided with an iron block, the bottom of the shielding plate is provided with a magnet, and the iron block is matched with the magnet.

Preferably, the material of the seventh support is an alloy.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the supporting mechanism is arranged, so that the tapered column can be stably erected by operating after the tapered column is inserted into soil, and the display stand is stably erected, so that the effect of stable support is achieved;

2. according to the invention, the pulling mechanism is arranged, and the supporting mechanism operates to drive the pulling mechanism to operate, so that the display drawing is pulled out, and the effect of automatic paper output display is achieved;

3. according to the invention, the shielding mechanism and the cleaning mechanism are arranged, so that the shielding mechanism can be operated to shield rainwater on the display drawing, and then the cleaning mechanism is used for cleaning the rainwater in the shielding mechanism, so that the effects of automatic shielding and automatic cleaning are achieved;

4. according to the invention, the storage mechanism and the turnover mechanism are arranged, and the turnover mechanism operates to drive the storage mechanism to operate, so that the pen is ejected leftwards, and the effect of automatically discharging the pen is achieved.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of the present invention.

Fig. 3 is a schematic perspective view of the supporting mechanism of the present invention.

Fig. 4 is a schematic perspective view of a first embodiment of the pulling mechanism of the present invention.

Fig. 5 is a schematic view of a second perspective structure of the pulling mechanism of the present invention.

Fig. 6 is a schematic view of a third perspective structure of the pulling mechanism of the present invention.

Fig. 7 is a schematic view of a first perspective structure of a shielding mechanism according to the present invention.

Fig. 8 is a schematic view of a second perspective structure of the shielding mechanism of the present invention.

Fig. 9 is a schematic perspective view of a cleaning mechanism according to the present invention.

Fig. 10 is a schematic diagram of a first perspective structure of the storage mechanism of the present invention.

Fig. 11 is a schematic diagram of a second perspective structure of the storage mechanism of the present invention.

Fig. 12 is a schematic view of a third perspective structure of the storage mechanism of the present invention.

Fig. 13 is a schematic view showing a first perspective structure of the tilting mechanism of the present invention.

Fig. 14 is a schematic view showing a second perspective structure of the tilting mechanism of the present invention.

In the reference numerals: 1-conical column, 2-rotating seat, 3-handle, 31-spiral spring, 4-rotating block, 5-display drawing, 6-first bracket, 7-first sliding sleeve, 8-sliding block, 9-first sliding rod, 10-supporting mechanism, 101-second sliding sleeve, 102-second bracket, 103-swinging rod, 104-first swinging block, 105-first spring, 11-pulling mechanism, 111-third bracket, 112-third sliding sleeve, 113-pushing block, 114-second spring, 115-fourth bracket, 116-rotating block, 117-second swinging block, 118-fourth sliding sleeve, 119-fifth bracket, 1110-winding wheel, 1111-first torsion spring, 1112-stay cord, 12-shielding mechanism, 121-mounting block, 122-first rotating shaft, 123-second torsion spring, 124-shielding cloth, 125-supporting block, 13-cleaning mechanism, 131-fifth sliding sleeve, 132-second sliding rod, 133-cleaning block, 134-compression spring, 14-storage mechanism, 141-sixth bracket, 142-storage tank, 143-second rotating shaft, 144-shielding plate, 145-third torsion spring, 146-sliding block, 147-third spring, 148-seventh bracket, 15-tilting mechanism, 151-contact block, 152-touch block, 153-iron block, 154-magnet.

Detailed Description

The invention will be further described with reference to the accompanying drawings and detailed description below:

1-14, a portable drawing showing stand for construction engineering comprises a conical column 1, a rotating seat 2, a handle 3, a spiral spring 31, a rotating block 4, a showing drawing 5, a first bracket 6, a first sliding sleeve 7, a sliding block 8, a first sliding rod 9, a supporting mechanism 10, a second sliding sleeve 101, a second bracket 102, a swinging rod 103, a first swinging block 104, a first spring 105, a pulling mechanism 11, a third bracket 111, a third sliding sleeve 112, a pushing block 113, a second spring 114, a fourth bracket 115, a rotating block 116, a second swinging block 117, a fourth sliding sleeve 118, a fifth bracket 119, a winding wheel 1110, a first torsion spring 1111, a pull rope, a shielding mechanism 12, a mounting block 121, a first rotating shaft 122, a second torsion spring 123, a shielding cloth 124, a supporting block 125, a cleaning mechanism 13, a fifth sliding sleeve 131, a second 132, a cleaning block 133, a compression spring 134, a storage mechanism 14, a sixth bracket 141, a storage box 142, a second rotating shaft 143, a shielding plate 144, a third torsion spring 146, a third sliding block 146, a seventh rotating block 147, a magnet 153, a touch-up block 152, a magnet 153, a touch-up block 153 and a magnet 153, the upper part of the conical column 1 is provided with a rotary seat 2, the lower part of the right side of the rotary seat 2 is provided with a handle 3, the rotary seat 2 is rotatably provided with a rotary block 4, the lower part of the rotary block 4 is wound with a volute spring 31, the volute spring 31 is connected between the rotary seat 2 and the rotary block 4, the rotary block 4 is wound with a display drawing 5, the lower part of the handle 3 is provided with a first bracket 6, the inner side of the upper part of the first bracket 6 is provided with a first sliding sleeve 7 in a sliding manner, the inner side of the first sliding sleeve 7 is provided with a sliding block 8 in a sliding manner, the rear side of the top of the sliding block 8 is provided with a first sliding rod 9, the first sliding rod 9 is connected with the display drawing 5, the conical column 1 is provided with a supporting mechanism 10, the supporting mechanism 10 is connected with the rotating seat 2, a pulling mechanism 11 is arranged on the rotating seat 2, and the pulling mechanism 11 is connected with the supporting mechanism 10 and the first sliding rod 9.

People hold the handle 3, and then lift this show shelf, wait that people arrive the building site after, people make toper post 1 insert in the soil, thereby make this show shelf erect, simultaneously supporting mechanism 10 operation, make this show shelf steady support subaerial, then supporting mechanism 10 drives pulling mechanism 11 operation, and then pull first slide bar 9 to the left, and then pulling show drawing 5, make rotatory piece 4 rotate and emit show drawing 5, volute spring 31 is compressed, simultaneously first slide bar 9 drives slider 8 and moves left, and then make first sliding sleeve 7 slide to the left in first support 6, when first sliding sleeve 7 can not continue to move left, first slide bar 9 makes slider 8 slide to the left in first sliding sleeve 7, then people can watch show drawing 5, after show drawing 5 finishes, people hold handle 3 again, and make toper post 1 pull out from the soil, supporting mechanism 10 resets, make pulling mechanism 11 resume the normal position, and volute spring 31 resets simultaneously, and then make rotatory piece 4 change normal position rolling, thereby carry out the rolling to show drawing 5, and then make first sliding bar 8 and first sliding sleeve 7 carry back to the left side, and so that the effect of carrying the first sliding sleeve 7 is moved back to the normal position has reached so that people can conveniently carry the show drawing.

As a preferred embodiment, the second sliding sleeve 101 is slidably arranged on the conical column 1, six second brackets 102 are respectively arranged on the second sliding sleeve 101 and the rotating seat 2, swing rods 103 are respectively and rotatably connected between three adjacent second brackets 102 on the lower side, first swing blocks 104 are respectively and rotatably connected between three adjacent second brackets 102 on the upper side, the first swing blocks 104 are rotatably connected with the swing rods 103, a first spring 105 is wound on the conical column 1, and the first spring 105 is connected between the rotating seat 2 and the second sliding sleeve 101.

As a preferred embodiment, the rear side of the second sliding sleeve 101 is provided with a third bracket 111, the lower part of the rear side of the rotating seat 2 is provided with a third sliding sleeve 112, the inner side of the third sliding sleeve 112 is provided with a pushing block 113 in a sliding manner, the lower part of the pushing block 113 is wound with a second spring 114, the second spring 114 is connected between the pushing block 113 and the third sliding sleeve 112, the lower part of the left side of the rotating seat 2 is provided with a fourth bracket 115, the rear side of the fourth bracket 115 is rotatably provided with a rotating block 116, the rotating block 116 is slidably connected with the pushing block 113, the rotating block 116 is provided with a second swinging block 117, the first sliding rod 9 is slidably provided with a fourth sliding sleeve 118, the fourth sliding sleeve 118 is rotatably connected with the second swinging block 117, the rear side of the third sliding sleeve 112 is provided with a fifth bracket 119, the inner side of the upper part of the fifth bracket 119 is rotatably provided with a winding wheel 1110, the rotating block 116 is wound with a first torsion spring 1111, the first torsion spring 1111 is connected between the fourth bracket 115 and the second swinging block 117, the third bracket 111 and the pushing block 113 are rotatably provided with a pull rope 1112, and the pull rope 1110 bypasses the winding wheel 1110.

As a preferred embodiment, the top of the rotating seat 2 is provided with a mounting block 121, the inner side of the right part of the mounting block 121 is rotatably provided with a first rotating shaft 122, two second torsion springs 123 are wound on the first rotating shaft 122, the second torsion springs 123 are connected between the mounting block 121 and the first rotating shaft 122, the top of the first sliding rod 9 is provided with a supporting block 125, the first rotating shaft 122 is wound with a shielding cloth 124, and the shielding cloth 124 is connected with the supporting block 125.

As a preferred embodiment, the mounting block 121 is provided with a fifth sliding sleeve 131, two second sliding rods 132 are slidably disposed inside the fifth sliding sleeve 131, a cleaning block 133 is connected between the bottoms of the second sliding rods 132 on the front side and the rear side, the cleaning block 133 is slidably connected with the shielding cloth 124, a compression spring 134 is wound on the second sliding rod 132, and the compression spring 134 is connected between the second sliding rod 132 and the fifth sliding sleeve 131.

As a preferred embodiment, the front side of the rotating seat 2 is provided with a sixth support 141, the inner side of the sixth support 141 is provided with a storage box 142, the left side of the bottom of the storage box 142 is provided with two seventh supports 148, a second rotating shaft 143 is rotatably connected between the two seventh supports 148, a cover plate 144 is arranged in the middle of the second rotating shaft 143, the cover plate 144 is matched with the storage box 142, a third torsion spring 145 is wound on the second rotating shaft 143, the third torsion spring 145 is connected between the second rotating shaft 143 and the seventh supports 148, a sliding block 146 is slidably arranged on the inner side of the storage box 142, and a third spring 147 is connected between the sliding block 146 and the right side inside the storage box 142.

As a preferred embodiment, the sliding block 8 is provided with a contact block 151 at the front side, the second rotating shaft 143 is provided with a touch block 152 at the front side, the contact block 151 is matched with the touch block 152, the storage box 142 is provided with an iron block 153 at the left side, the bottom of the cover plate 144 is provided with a magnet 154, and the iron block 153 is matched with the magnet 154.

When the conical column 1 is inserted into the soil, the soil enables the second sliding sleeve 101 to move upwards, the first spring 105 is compressed, the second support 102 at the lower side is further enabled to move upwards, the swing rod 103 rotates outwards until being pressed on the ground, the first swing block 104 is further enabled to rotate outwards, the purpose of stable support is achieved, after the showing of the drawing 5 is completed, people enable the conical column 1 to be pulled out of the soil, the first spring 105 is reset, the second sliding sleeve 101 is enabled to move back to the original position, and the swing rod 103 and the first swing block 104 are enabled to rotate back to the original position.

In the initial state, when the second sliding sleeve 101 moves upwards, the second spring 114 is reset, so that the pushing block 113 moves downwards, the pull rope 1112 is pulled, the pull rope 1112 contacts with the reel 1110 and generates friction, the reel 1110 is rotated by friction force, then the pushing block 113 rotates the rotating block 116 downwards, the second swinging block 117 rotates downwards, the first torsion spring 1111 is compressed, the fourth sliding sleeve 118 moves leftwards, meanwhile, the fourth sliding sleeve 118 slides downwards on the first sliding rod 9, so that the first sliding rod 9 moves leftwards, the drawing 5 is pulled out, after the drawing 5 is finished, the second sliding sleeve 101 moves downwards to the original position, the pushing block 113 moves back to the original position, the second spring 114 is compressed, then the first torsion spring 1111 resets, the rotating block 116 and the second swinging block 117 rotate back to the original position, the first sliding sleeve 9 moves back to the original position with the fourth sliding sleeve 118, and the volute spring 31 winds the rotating block 4 to roll the drawing 5.

The first sliding rod 9 moves leftwards to drive the supporting block 125 to move leftwards, so that the shielding cloth 124 is pulled, the first rotating shaft 122 rotates and releases the shielding cloth 124, the second torsion spring 123 is compressed, then the shielding cloth 124 can shield rain or sun for displaying the drawing 5, after the first sliding rod 9 moves back to the original position, the second torsion spring 123 resets, the first rotating shaft 122 reversely rotates back to the original position, and the shielding cloth 124 is wound, so that the supporting block 125 moves back to the original position.

In the initial state, the compression spring 134 is in a compression state, the elasticity of the compression spring 134 enables the cleaning block 133 to be clung to the shielding cloth 124, when the shielding cloth 124 is wound by the first rotating shaft 122, the cleaning block 133 slides on the shielding cloth 124, and then impurities such as rainwater and dust on the surface of the shielding cloth 124 can be cleaned, so that the purpose of automatic cleaning is achieved.

In the initial state, the third spring 147 is in a compressed state, when people need to use the pen to perform the marking on the display drawing 5, people manually rotate the second rotating shaft 143 leftwards, further rotate the shielding plate 144 leftwards, the third torsion spring 145 is compressed, the third spring 147 resets, the sliding block 146 moves leftwards, the pen slides out of the storage box 142 leftwards for a certain distance, then people take out the pen and use the pen, when people do not need to use the pen, people put the pen back into the storage box 142, further push the sliding block 146 back to the original position, the third spring 147 is compressed, then people release the shielding plate 144, the third torsion spring 145 resets, the shielding plate 144 reversely rotates to the original position with the second rotating shaft 143, and the storage box 142 is covered.

The sliding block 8 moves leftwards to drive the contact block 151 to move leftwards, when the contact block 151 moves leftwards to be in contact with the touch block 152, the contact block 151 enables the touch block 152 to rotate leftwards, the second rotating shaft 143 to rotate leftwards, the shielding plate 144 rotates leftwards, the magnet 154 rotates rightwards, the iron block 153 is sucked by the magnet 154, people take out the pen again, after the showing of the drawing 5 is finished, the sliding block 8 drives the contact block 151 to move back to the original position, the magnet 154 is separated from the iron block 153, the third torsion spring 145 enables the touch block 152, the magnet 154 and the shielding plate 144 to rotate back to the original position, and accordingly the storage box 142 is covered, and the purpose of automatic opening and closing is achieved.

It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a portable drawing show shelf for building engineering, a serial communication port, including toper post (1), roating seat (2), handle (3), spiral spring (31), rotating block (4), show drawing (5), first support (6), first sliding sleeve (7), sliding block (8), first slide bar (9), supporting mechanism (10) and pulling mechanism (11), toper post (1) upper portion is equipped with roating seat (2), be equipped with handle (3) on roating seat (2), rotating block (4) are gone up to rotate on roating seat (2), rotating block (4) lower part winds spiral spring (31), spiral spring (31) connect between roating seat (2) and rotating block (4), winding has show drawing (5) on roating block (4), handle (3) lower part is equipped with first support (6), first support (6) upper portion inboard slidingtype is equipped with first sliding sleeve (7), first sliding sleeve (7) inboard slidingtype is equipped with sliding block (8), be equipped with first slide bar (9) on sliding block (8), first slide bar (9) are equipped with on sliding block (8), first slide bar (9) are connected with supporting mechanism (10) on supporting mechanism (1), a pulling mechanism (11) is arranged on the rotating seat (2), and the pulling mechanism (11) is connected with the supporting mechanism (10) and the first sliding rod (9);

the conical column (1) is provided with a second sliding sleeve (101) in a sliding manner, six second brackets (102) are respectively arranged on the second sliding sleeve (101) and the rotating seat (2), swing rods (103) are respectively and rotationally connected between three adjacent second brackets (102) on the lower side, first swing blocks (104) are respectively and rotationally connected between three adjacent second brackets (102) on the upper side, the first swing blocks (104) are respectively and rotationally connected with the swing rods (103), a first spring (105) is wound on the conical column (1), and the first springs (105) are connected between the rotating seat (2) and the second sliding sleeve (101);

be equipped with third support (111) on second sliding sleeve (101), be equipped with third sliding sleeve (112) on roating seat (2), third sliding sleeve (112) inboard slidingtype is equipped with impeller (113), impeller (113) lower part is around having second spring (114), second spring (114) are connected between impeller (113) and third sliding sleeve (112), be equipped with fourth support (115) on roating seat (2), rotatory formula is equipped with rotatory piece (116) on fourth support (115), rotatory piece (116) are connected with impeller (113) slidingtype, be equipped with second swing piece (117) on rotatory piece (116), first slide bar (9) are gone up slidingtype and are equipped with fourth sliding sleeve (118), fourth sliding sleeve (118) are connected with second swing piece (117) rotation formula, be equipped with fifth support (119) on third sliding sleeve (112), fifth support (119) upper portion inboard rotation is equipped with reel (1110), wind on rotatory piece (116) have first torsion spring (1111), first torsion spring (1111) are connected between fourth support (115) and second swing piece (1110) and third swing piece (111) are walked around and are connected with reel (1112).

2. The portable drawing showing stand for constructional engineering according to claim 1, wherein the top of the rotary seat (2) is provided with a mounting block (121), a first rotating shaft (122) is rotatably arranged on the inner side of the mounting block (121), two second torsion springs (123) are wound on the first rotating shaft (122), the second torsion springs (123) are connected between the mounting block (121) and the first rotating shaft (122), a supporting block (125) is arranged on the top of the first sliding rod (9), and shielding cloth (124) is wound on the first rotating shaft (122), and the shielding cloth (124) is connected with the supporting block (125).

3. The portable drawing showing stand for constructional engineering according to claim 2, wherein a fifth sliding sleeve (131) is arranged on the mounting block (121), two second sliding rods (132) are arranged on the inner side of the fifth sliding sleeve (131) in a sliding mode, a cleaning block (133) is connected between the bottoms of the two second sliding rods (132), the cleaning block (133) is connected with the shielding cloth (124) in a sliding mode, a compression spring (134) is wound on the second sliding rod (132), and the compression spring (134) is connected between the second sliding rod (132) and the fifth sliding sleeve (131).

4. A portable drawing show shelf for constructional engineering according to claim 3, characterized in that the rotating seat (2) is provided with a sixth support (141), the inner side of the sixth support (141) is provided with a storage box (142), the bottom of the storage box (142) is provided with two seventh supports (148), a second rotating shaft (143) is rotatably connected between the two seventh supports (148), the middle part of the second rotating shaft (143) is provided with a cover plate (144), the cover plate (144) is matched with the storage box (142), the second rotating shaft (143) is wound with a third torsion spring (145), the third torsion spring (145) is connected between the second rotating shaft (143) and the seventh supports (148), the inner side of the storage box (142) is provided with a sliding block (146), and a third spring (147) is connected between the sliding block (146) and the storage box (142).

5. The portable drawing showing stand for construction engineering according to claim 4, wherein the sliding block (8) is provided with a contact block (151), the second rotating shaft (143) is provided with a touch block (152), the contact block (151) is matched with the touch block (152), the storage box (142) is provided with an iron block (153), the bottom of the shielding plate (144) is provided with a magnet (154), and the iron block (153) is matched with the magnet (154).

6. The portable drawing display stand for construction engineering according to claim 5, wherein the seventh bracket (148) is made of alloy.