CN114603818A - Double-screw extruder for biodegradable material - Google Patents

Abstract

The invention discloses a double-screw extruder facing to biodegradable materials, which comprises: a segmented barrel comprising a plurality of spaced apart heated barrels; a cooling unit is arranged among the plurality of heating machine barrels; the input end of the sectional type machine barrel is provided with a feeding unit for introducing materials; an extrusion unit for guiding out materials is arranged in the sectional type machine barrel. The invention designs and develops a sectional type heating cylinder body and a double-inlet and double-outlet water channel system, realizes the accurate and independent control of the temperature of different processing sections, and solves the common problem of local high-temperature degradation caused by the incapability of quick temperature response in the traditional extrusion, thereby manufacturing the biodegradable polymer composite material with uniform physical properties with high stability and high productivity.

Description

A twin-screw extruder for biodegradable materials

technical field

The invention relates to the field of biodegradable material processing, in particular to a twin-screw extruder for biodegradable materials.

Background technique

Biodegradable polymers are the basic raw materials for the preparation of regenerated tissues and organs, but it is difficult for a single biodegradable polymer material to meet the performance requirements of regenerated tissues and organs. Melt extrusion processing is an important means to achieve melt mixing, plasticization and packaging of polymers and other functional materials, and has a positive effect on the functionalization, high performance and compounding of regenerated tissues and organs. However, as a heat-sensitive material, biodegradable polymers are prone to thermo-oxidative degradation during long-term extrusion processing.

At present, the extrusion processing equipment in the market is due to the mismatch between the screw thread lead, the material residence time and the plasticizing mixing effect, the poor water cooling effect, the unstable shear stress on the flow channel wall, the slow response of the temperature control system, and the inability to fill the protective gas. high-pressure extruder, etc., resulting in high temperature degradation and carbonization, scaling on the inner wall of the flow channel, oxidative degradation, and unstable extrusion during the processing of degradable polymers. In addition, various degradable materials are mixed during processing When a variety of raw materials are stored, the classification and import process is too complicated, the feeding rate and ratio of various materials are difficult to control, and the labor intensity is too large, resulting in the problem of poor quality of the finished products based on subsequent melt mixing.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION An object of the present invention is to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages that will be described hereinafter. To achieve these objects and other advantages according to the present invention, there is provided a twin-screw extruder for biodegradable materials, comprising:

The segmented barrel includes a plurality of heating barrels arranged at intervals; a cooling unit is arranged between the plurality of the heating barrels; the input end of the segmented barrel is provided with a feeding unit for introducing materials; The segmented barrel is internally provided with an extrusion unit for discharging materials.

Preferably, the cooling unit includes: a cooling barrel is arranged between a plurality of the heating barrels; a cooling water tank capable of circulating liquid collection and drainage is commonly connected to the lower ends of the plurality of the cooling barrels; the A water pump is arranged inside the cooling water tank, and the input end and the output end are respectively connected with a cooling water inlet main pipe and a cooling water outlet main pipe; a cooling manifold with a plurality of built-in water circuits is arranged between the cooling water inlet main pipe and the cooling water outlet main pipe; Double inlet and outlet cooling pipes are respectively arranged between the cooling barrel and the cooling manifold; the double inlet and outlet cooling pipes respectively comprise an inner cooling pipe and an outer cooling pipe; both ends of the inner cooling pipe are butted to the cooling manifold; The middle part of the inner cooling pipe is wound into a plurality of turns, and is fitted and fixed on the outer wall of the cooling barrel; the two ends of the outer cooling tube are butted to the cooling manifold; the middle part of the outer cooling tube is wound into a plurality of turns, and is fitted and fixed On the outer layer of the inner cooling pipe, a cooling water channel with double inlet and double outlet is formed; the two ends of the inner cooling pipe and the outer cooling pipe are arranged in front and rear along the axis of the cooling barrel, and the same side of the cooling barrel is equalized.

Preferably, the feeding unit includes a batching bucket; the batching bucket has four built-in guide bins with upper ends open; the middle of the four guide bins is integrally connected with a support column; The bottom of the silo is inclined to the middle, converges uniformly to form a leak, and extends downward to form a discharge pipe; the leak is arranged at intervals below the support column; the bottom of the four guide bins is slidably provided with a drawable to the outside. Step-by-step discharge plates; four said guide bins are provided with chute I on both sides above the bottom; two sides of the four step-by-step discharge plates are provided with slide bars I that can be respectively embedded in two slide grooves I, so as to A sliding connection is formed; the lower end of the support column is provided with a plurality of limit grooves; the front ends of the four step-by-step discharge plates are provided with handles; the rear ends of the four step-by-step discharge plates are provided with snap-in limit grooves four of the step-by-step discharge plates are provided with four locating pin holes at intervals; the sides of the four said guide bins are provided with sliding pins that are vertically downward and match the four locating pin holes .

Preferably, a vibrating frame is arranged in the batching bucket; the support column is a hollow structure; There is a linear bearing; the upper end of the sliding rod is fixedly arranged on the inner ring of one of the linear bearings, and after passing through, a turning frame is fixedly arranged; the upper end of the turning frame is fixedly connected with the output end of the linear reciprocating motor; the The turning frame includes four turning rods extending into the four material guide bins respectively; a plurality of inclined rods are arranged on the four turning rods at intervals; The lower end of the sliding rod is fixed on the inner ring of another linear bearing, and a screed table is fixed after passing out; the screed table is suspended in the discharge pipe; The table is provided with material turning claws with a cross structure; the upper ends of the four turning claws are respectively provided with two arc surfaces that abut in the middle.

Preferably, a screw feeder is also included; the output end of the screw feeder is connected to the first section of the segmented barrel; the lower end of the batching barrel is integrally provided with a conical discharge funnel; The input end of the screw feeder is connected to the lower port of the discharge funnel; the middle part of the discharge funnel is slidably provided with a push-pull plate; the side of the discharge funnel is provided with a strip-shaped sliding frame; Both sides of the frame are provided with chute II; both sides of the push-pull plate are provided with slide bars II that can be embedded in two chute II respectively, so as to realize slidable connection; The large, medium and small flow restrictors are matched and connected; elastic baffles are arranged on both sides of the middle flow restrictor; fixed baffles are respectively arranged on one side of the small flow restrictor and the large lower flow restrictor.

Preferably, wherein, the extrusion unit includes: large-lead twin screws arranged in opposite directions, which are axially rotatably penetrated in the segmented barrel; the twin-screw external spline teeth are inclined by 1°.

Preferably, a power unit is also included; the power unit includes: a feeding motor and a spindle motor; the feeding motor is arranged in front of the feeding unit, and the main shaft motor is arranged in front of the segmented barrel, through A gearbox is connected to the twin screw.

Preferably, wherein, it also includes a heating unit; the heating unit includes: a solenoid valve, a heater, and a temperature control meter; there are multiple heaters, and they are respectively arranged in multiple heating cylinders.

Preferably, a protection unit is also included; the protection unit includes: an air inlet pipe, a booster pump, an air outlet pipe, and a nitrogen tank; the input end of the booster pump is connected to the nitrogen tank through an air outlet pipe; the output of the booster pump The end is connected to the first section of the segmented barrel through an outlet pipe.

Preferably, an operation unit is also included; the operation unit includes a control frame fixedly arranged on one side of the segmented barrel; and a display control screen is arranged on the control frame.

The present invention includes at least the following beneficial effects:

The invention designs and develops a segmented heating cylinder and a "double-in and double-out" water channel system, which realizes precise and independent control of the temperature of different processing sections, and solves the problem of local high-temperature degradation caused by the inability of rapid temperature response in traditional extrusion. Common problems; equipped with a pressurized nitrogen injection protection system to effectively prevent the thermo-oxidative degradation of biomaterials in high temperature environments; based on the above key technical units, an extrusion equipment for melt mixing of biodegradable polymers has been integrated; anisotropic The large-lead thread structure realizes the circumferential flow and material exchange of the polymer melt, and overcomes the antagonistic problem of the heat-sensitive polymer staying for a long time for degradation and insufficient plasticization and mixing; the involute small-angle spline connection technology is proposed to ensure The stability of the shear stress on the flow channel wall breaks through the key technical bottleneck of the formation of scaling on the inner wall of the flow channel and the formation of static layers; the use of multiple heating barrels in the segmented barrels and spaced cooling units to achieve different The precise and independent control of the temperature of the processing section (heating barrel) solves the common problem of local high-temperature degradation caused by the inability of rapid temperature response in the traditional molten material extrusion process, thereby achieving stable and efficient preparation of biodegradable materials.

Other advantages, objects, and features of the present invention will appear in part from the description that follows, and in part will be appreciated by those skilled in the art from the study and practice of the invention.

Description of drawings

Fig. 1 is the general structure diagram of the present invention;

Fig. 2 is the structure diagram of double inlet and outlet cooling pipes of the present invention;

Fig. 3 is the detailed structure diagram of the feeding unit of the present invention;

Fig. 4 is the top plan view of the screed table of the present invention;

Fig. 5 is the top view structure diagram of the batching box of the present invention;

FIG. 6 is a top plan view of the push-pull plate of the present invention;

Fig. 7 is a side structural view of one of the twin screws of the present invention;

Fig. 8 is the external spline key tooth of one of the twin screws of the present invention;

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can refer to the description and implement accordingly. It should be understood that terms such as "having", "comprising" and "including" as used herein do not exclude the presence or addition of one or more other elements or combinations thereof. It should be noted that, in the description of the present invention, the azimuth or positional relationship indicated by the terms is based on the azimuth or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that A device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In the description of the present invention, unless otherwise expressly specified and limited, the terms "installed", "provided with", "sleeved/connected", "connected", etc., should be understood in a broad sense, for example, "connected" may be A fixed connection can also be a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations. In addition, in the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact with the first and second features, or the first and second features through the middle indirect contact with the media. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature.

Figures 1-8 show an implementation form of the present invention, including:

The segmented barrel 1 includes a plurality of heating barrels 11 arranged at intervals; a cooling unit 2 is arranged between the plurality of the heating barrels 11; The feeding unit 3; the segmented barrel 1 is provided with an extrusion unit 4 for exporting materials.

Working principle: When using the present invention, the materials to be processed are introduced into the feeding unit 3, and the 3 feeding units successively feed the materials into the segmented cylinder 1, and install the pre-set heating cylinders 11 at all levels. Heating temperature, the heating device inside the heating barrel 11 uniformly heats and melts the material, and extrudes the material while evenly stirring the material through the extrusion unit 4. The barrel 11 is cooled and cooled accordingly, so that the material is circulated in the segmented barrel 1 according to the process of heating→cooling→heating→cooling in the whole process of melting, stirring and extrusion, and finally until the molten material is exported, and finally Just send the material.

The advantage of this technical solution is that the present invention adopts the plurality of heating barrels 11 in the segmented barrel 1 to cooperate with the cooling units 2 arranged at intervals, so as to realize precise and independent temperature control of different processing sections (heating barrels 11 ). , which solves the common problem of local high temperature degradation caused by the inability of rapid temperature response in the traditional molten material extrusion process, so that biodegradable polymer composite materials with uniform physical properties can be produced with high stability and high productivity.

In the above technical solution, the cooling unit 2 includes: a cooling barrel 21 is arranged between a plurality of the heating barrels 11; Water tank 22; a water pump is provided inside the cooling water tank 22, and a cooling water inlet main pipe 23 and a cooling water outlet main pipe 24 are respectively connected to the input end and the output end; a built-in cooling water inlet pipe 23 and the cooling water outlet main pipe 24 are arranged between the cooling water main pipe 23 and the cooling water outlet main pipe 24 cooling manifolds 25 of multiple water circuits; dual inlet and outlet cooling pipes 26 are respectively provided between the plurality of cooling barrels 21 and the cooling manifolds 25; the dual inlet and outlet cooling pipes 26 respectively include an inner cooling pipe 261 and an outer cooling pipe Pipe 262; both ends of the inner cooling pipe 261 (ie, the water inlet end and the water outlet end) are butted to the cooling manifold 25; the middle of the inner cooling pipe 261 is wound into multiple circles, and is fitted and fixed to the outer wall of the cooling barrel 21 ; The two ends of the outer cooling pipe 262 (ie the water inlet end and the water outlet end) are butted to the cooling manifold 25; A double-in and double-out cooling water channel is formed; both ends of the inner cooling pipe 261 and the outer cooling pipe 262 are arranged in front and back along the axis of the cooling barrel 21 , and the cooling barrel 21 is on the same side.

The advantages of this technical solution are:

(1) The various components in the cooling unit 2 together form a "double-in and double-out" water channel system, which further improves the cooling efficiency of each cooling barrel 21, and cooperates with the segmented barrel 1 to solve the traditional process. The melt extrusion of the degraded material causes the common problem of local high temperature degradation due to the inability to respond quickly to temperature, so that the material in the segmented barrel 1 can be cooled to different degrees in the cooling barrels 21 arranged at intervals. A process that can significantly improve the preparation efficiency and finished product quality of the melt extrusion of degradable materials;

(2) Compared with the single-channel cooling, this kind of double-inlet and double-outlet cooling pipes has better heat transfer effect; at the same time, the use of the double-inlet-outlet cooling pipe 26 with the outer ring wrapping the inner ring means that the water outlet end of the outer ring is used for cooling. It can take away the heat of the inner ring, and the cooling water inlet end can take away the heat of the cooling water outlet end, which is a circulating cooling mode, so that the heat transfer effect is better, the cylinder body is cooled evenly, and it is not easy to deform;

(3) At the same time, the dual water channels of the dual inlet and outlet cooling pipes 26 are arranged in the front and rear of the axis of the cooling barrel 21. Compared with the left and right arrangement of the traditional dual water channels, the length of the cooling area does not increase, but it saves installation space and saves material cost.

In the above technical solution, the feeding unit 3 includes a batching bucket 31; the batching bucket 31 has four built-in guide bins 32 with upper ends open; the middle of the four guide bins 32 is integrally connected with a support column 321; The bottoms of the four guide bins 32 are slanted toward the middle, converge together to form leaks, and extend downward to form discharge pipes 322; the leaks are arranged at intervals below the support column 321; the bottoms of the four guide bins 32 The upper part is slidably provided with a step-by-step discharge plate 33 that can be pulled out to the outside; four sides of the bottom of the four guide bins 32 are provided with chute I; The slide bars I of the two chutes I are respectively embedded to form a sliding connection; the lower ends of the support columns 321 are provided with a plurality of limit slots 320; the front ends of the four step-by-step discharge plates 33 are provided with handles; The rear end of the step-by-step discharge plate is provided with a wedge 330 which is inserted into the limiting groove 320; the four step-by-step discharge plates 33 are provided with four positioning pin holes 331 at intervals; the four guide bins 32 The sides are provided with sliding pins 323 which are vertically downward and match with the four positioning pin holes 331 .

The advantages of this technical solution are: first, the batching bucket 31 is provided with four guide bins 32, which can realize pre-distribution and storage of various degradable materials, and facilitate the preliminary mixing of different materials; the support column 321 is used to connect the four guide bins 32. The side wall of the silo 32 ensures more stable fixation; during the introduction of ingredients, the four positioning pin holes can be regarded as the size of the discharge volume of each guide silo, that is, more guide siloes need to be invested in proportion, which can be Pull out the stepped discharge plate to the maximum extent, and insert the sliding pin 323 into the positioning pin hole at the far right end of the stepped discharge plate to open a maximum space for the material to be exported. fixed, to control the amount of material flowing out of the guide bin; by performing different configurations in the four different guide bins above, different mixing ratios of the exported materials can be formed in the four guide bins to achieve one kind of material mixing. With the function of proportion adjustment, the mixed materials can be discharged downwards from the discharge pipe 322 in a unified manner, which completes the unified discharge function of the mixed materials.

In the above technical solution, a vibrating frame 34 is arranged in the batching bucket 31; the support column is a hollow structure; Linear bearings 342 are arranged at both ends of the support column 321; the upper end of the sliding rod 341 is fixedly arranged on the inner ring of one of the linear bearings 342, and a turning frame 35 is fixed after passing through; the upper end of the turning frame 35 is fixed The output end of the linear reciprocating motor 350 is connected; the turning frame 35 includes four turning rods 351 extending into the four material guide bins 32 respectively; the four turning rods 351 are provided with a plurality of Oblique rods 352; a plurality of turning material pieces 353 are arranged laterally on a plurality of the inclined rods 352; A material table 36; the screed table 36 is suspended in the discharge pipe 322; the screed table 36 is provided with a cross-structure turning claw 361; the upper ends of the four turning claw 361 are respectively provided with two A curved surface 362 abutting in the middle;

The advantages of this technical solution are:

(1) By using a vibrating frame 34 with a composite structure, the materials inside the four guide bins 32 are turned uniformly together; the sliding rod 341 is used as a sliding member to slide in the middle of the hollow fixed column 321, through two straight lines The bearing 342 performs stable up-and-down reciprocating motion, and the linear reciprocating motor 350 provides the motion power; after the four turning rods 351 extend into the guide bin 32 respectively, the turning rods 351 together with the turning materials on the plurality of inclined rods 352 cooperate with each other. Sheet 353, to perform stable up and down cyclic turning of materials to ensure that the materials can be stably and uniformly exported from the bottom;

(2) The screeding table 36 under the vibrating frame also shakes up and down with the sliding bar 341, so that different materials gathered from four directions can be scattered, mixed into a more uniform state, and then discharged downward; at the same time The four turning claws 361 on the screed table move up and down continuously, which can prevent the accumulation of materials gathered in the discharge pipe 322 and improve the discharge efficiency; The material can slide and fall, and improve the overall discharge effect.

In the above technical solution, a screw feeder 30 is also included; the output end of the screw feeder 30 is connected to the first section of the segmented barrel 1; the lower end of the batching barrel 31 is integrally provided with a conical row The feeding funnel 311; the input end of the screw feeder 30 is connected to the lower port of the discharging funnel 311; the middle part of the discharging funnel 311 is slidably provided with a push-pull plate 37; the side surface of the discharging funnel 311 is provided through There is a strip-shaped sliding frame; sliding grooves II are arranged on both sides of the sliding frame; sliding bars II that can be respectively embedded in two sliding grooves II are provided on both sides of the push-pull plate 37, thereby realizing a slidable connection; The push-pull plate 37 is provided with large, medium and small restrictors that can be matched with the discharge pipe 322; elastic baffles 374 are provided on both sides of the middle restrictor 372; the small restrictor 371 and the large restrictor Fixed baffles 375 are respectively provided on one side of the lower flow restricting port 373 .

The advantage of this technical solution is that the operator can adjust the push-pull plate by sliding continuously, so that the different restrictor ports are connected to the lower port of the discharge pipe 322, so as to adjust the final discharge volume after the material is mixed; two elastic The baffle 374 can achieve the position limit to ensure that the middle flow restricting port 372 can be accurately connected to the lower port of the discharge pipe 322. At the same time, when the push-pull plate is dragged as a whole, the elastic baffle can be compressed, ensuring that the large flow restricting port 373 and the small restricting port 373 can be compressed. The flow port 371 can be slidably connected to the lower port of the discharge pipe 322, and the two fixed baffles can limit the sliding push-pull plate as a whole at the initial end and the extreme end, making it more stable.

In the above technical solution, the extrusion unit 4 includes: large-lead twin screws 41 arranged in opposite directions, which are axially rotatably penetrated in the segmented barrel 1; the twin screws 41 are externally splined. The teeth 410 are inclined by 1°.

The advantage of this technical solution is that the extrusion unit 4 adopts a twin screw 41 with an anisotropic large lead thread structure, which realizes the circumferential flow and material exchange of the polymer melt, and overcomes the long-term residence degradation of the heat-sensitive polymer. At the same time, the double-screw external spline teeth are inclined by 1°, and the involute small-angle spline connection technology is proposed, which ensures the stability of the shear stress on the runner wall and breaks through the runner. The key technical bottleneck of inner wall scaling and static layer formation.

In the above technical solution, a power unit is also included; the power unit includes: a feeding motor 51 and a main shaft motor 52; the feeding motor 51 is arranged in front of the feeding unit 3, and the main shaft motor 52 is arranged in a segmented The front of the barrel 1 is connected with the twin screw 41 through a gearbox 53 .

The advantages of this technical solution are: the feeding motor 51 and the spindle motor 52 configured in the power unit 5 provide stable and controllable power energy for the relevant operating equipment of the extrusion unit and the feeding unit, and the configuration is convenient and the material is squeezed out. out more stable.

In the above technical solution, a heating unit is also included; the heating unit includes: a solenoid valve, a heater, and a temperature control meter; there are multiple heaters 61 , which are respectively arranged in the multiple heating cylinders 11 .

The advantages of this technical solution are: the heating capacity is provided for the heating barrel through the equipment in the heating unit, the configuration is convenient, and the heating temperature is easy to control.

In the above technical solution, a protection unit is also included; the protection unit includes: an inlet pipe 71, a booster pump 72, an outlet pipe 73, and a nitrogen tank 74; the input end of the booster pump 72 is connected to the nitrogen tank 74 through the gas outlet pipe 73. ; The output end of the booster pump 72 is connected to the first section of the segmented barrel 1 through the air outlet pipe 73 .

The advantage of this technical solution is that each equipment of the protection unit forms a pressurized nitrogen injection protection system. During the melt extrusion process of degradable materials, nitrogen is continuously introduced to cooperate with the operation, which can effectively prevent the high temperature environment. The thermo-oxidative degradation of biodegradable materials improves the preparation quality of material hot-melt mixtures.

In the above technical solution, an operation unit is also included; the operation unit includes a control frame 81 fixedly arranged on one side of the segmented barrel 1 ; the control frame 81 is provided with a display control screen 82 .

The advantages of this technical solution are: it is convenient for the operator to control the relevant operation equipment by manipulating the display control screen 82 in time, the control is convenient, and the parameter adjustment is timely.

Example 1:

Set the heating temperature of each section of the heating cylinder 11 as: 220°C, 210°C, 205°C, 200°C, 185°C, and keep it for 30 minutes after reaching the set temperature; turn on the nitrogen tank 74 switch, turn on the booster pump 72; 45% by mass of L-polylactic acid and 55% by mass of hydroxyapatite are fully mixed and added to feeding unit 3; the material of feeding unit 3 transports the powder raw material to the head end of segmented barrel 1 along the distribution direction of the feeding pipe ; Set the extrusion rate of the large-lead twin-screw 41 to 110 r/min; open the cooling unit 2 to inject cooling water to keep the temperature of each heating barrel 11 constant; Under the action of the strong shear force of 41, the material is melted, then dispersed, distributed and mixed; finally, the material is extruded from the die at the end of the segmented barrel 11 by extrusion of the twin-screw 41.

Example 2:

Set the heating temperature of each section of the heating barrel 11 as: 230°C, 220°C, 195°C, 190°C, 185°C, and keep it for 30 minutes after reaching the set temperature; turn on the nitrogen tank 74 switch, turn on the booster pump 72; 40% mass of L-polylactic acid and 60% mass of hydroxyapatite are fully mixed and then added to feeding unit 3; the material of feeding unit 3 transports the powder raw material to the head end of segmented barrel 1 along the distribution direction of the feeding pipe ; Set the extrusion rate of the large-lead twin-screw 41 to 110 r/min; open the cooling unit 2 to inject cooling water to keep the temperature of each heating barrel 11 constant; Under the action of the strong shear force of 41, the material is melted, then dispersed, distributed and mixed; finally, the material is extruded from the die at the end of the segmented barrel 11 by extrusion of the twin-screw 41.

Example 3:

Set the heating temperature of each section of the heating barrel 11 as: 210°C, 200°C, 190°C, 185°C, 180°C, and keep it for 30 minutes after reaching the set temperature; turn on the nitrogen tank 74 switch, turn on the booster pump 72; 30% by mass of L-polylactic acid, 60% by mass of hydroxyapatite and 10% by mass of polyethylene glycol are fully mixed and then added to feeding unit 3; The head end of the segmented barrel 1; the extrusion rate of the large-lead twin-screw 41 is set to 110 r/min; the cooling unit 2 is opened to inject cooling water to keep the temperature of each heating barrel 11 constant; Under the action of the heating device and the strong shearing force of the twin screw 41, the material is melted, then dispersed, distributed and mixed; finally, the twin screw 41 extrudes the material from the die at the end of the segmented barrel 11. .

The number of apparatuses and processing scales described here are intended to simplify the description of the present invention. Applications, modifications and variations to the present invention will be apparent to those skilled in the art. Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (10)

1. a twin-screw extruder facing biodegradable material, is characterized in that, comprises: The segmented barrel includes a plurality of heating barrels arranged at intervals; a cooling unit is arranged between the plurality of the heating barrels; the input end of the segmented barrel is provided with a feeding unit for introducing materials; The segmented barrel is internally provided with an extrusion unit for discharging materials. 2 . The twin-screw extruder for biodegradable materials according to claim 1 , wherein the cooling unit comprises: a cooling barrel is arranged between a plurality of the heating barrels; a plurality of The lower end of the cooling cylinder is jointly connected with a cooling water tank that can collect and discharge liquid in a circulating manner; a water pump is arranged inside the cooling water tank, and the input end and the output end are respectively connected with a cooling water inlet pipe and a cooling water outlet pipe; A cooling manifold with a plurality of built-in water paths is arranged between the water main pipe and the cooling water outlet main pipe; a dual inlet and outlet cooling pipe is respectively arranged between the plurality of the cooling barrels and the cooling manifold; the dual inlet and outlet cooling pipes respectively include an inner A cooling pipe and an outer cooling pipe; the two ends of the inner cooling pipe are butted to the cooling manifold; the middle of the inner cooling pipe is wound into multiple turns, and is fitted and fixed to the outer wall of the cooling barrel; the two ends of the outer cooling pipe are butted to the cooling manifold; the middle part of the outer cooling pipe is wound into multiple circles, and the outer layer of the inner cooling pipe is attached and fixed to form a cooling water channel with double inlet and double outlet; the two ends of the inner cooling pipe and the outer cooling pipe They are arranged in front and back along the axis of the cooling barrel, and the cooling barrels are on the same side. 3 . The twin-screw extruder for biodegradable materials according to claim 1 , wherein the feeding unit comprises a batching barrel; and the batching barrel has four built-in guide bins with open upper ends. 4 . The middle parts of the four said guide bins are integrally connected with support columns; the bottoms of the four said guide bins are inclined to the middle, converge together to form a leak, and extend downward to form a discharge pipe; the leaks are arranged at intervals on the support Below the column; above the bottom of the four said guide bins are slidably provided with step-by-step discharge plates that can be drawn out to the outside; The two sides of the discharge plate are provided with slide bars I that can be respectively embedded in two chutes I, thereby forming a sliding connection; the lower end of the support column is provided with a plurality of limit grooves; the front ends of the four step-by-step discharge plates are provided There are handles; the rear ends of the four step-by-step discharge plates are provided with wedge blocks that are inserted into the limit grooves; the four step-by-step discharge plates are provided with four positioning pin holes at intervals; the four guide bins The sides are provided with sliding pins that are vertically downward and are matched with the four positioning pin holes. 4. The twin-screw extruder for biodegradable materials according to claim 3, wherein a vibrating frame is arranged in the batching barrel; the support column is a hollow structure; the middle part of the vibrating frame is A sliding rod movably penetrated inside the support column is provided; linear bearings are provided at both ends of the supporting column; the upper end of the sliding rod is fixedly arranged on the inner ring of one of the linear bearings, and is fixedly provided with a flip after passing through. The upper end of the turning frame is fixedly connected with the output end of the linear reciprocating motor; the turning frame includes four turning rods respectively extending into the four material guide bins; A plurality of inclined rods are arranged at intervals; a plurality of turning material pieces are respectively arranged laterally on the plurality of inclined rods; the lower end of the sliding rod is fixedly arranged on the inner ring of another linear bearing, and is fixedly arranged with a uniform after passing through. a material table; the screed table is suspended in the discharge pipe; the screed table is provided with a cross-structure turning claws; the upper ends of the four turning claws are respectively provided with two centering abutting claws Arc. 5. The twin-screw extruder for biodegradable materials according to claim 3, further comprising a screw feeder; the output end of the screw feeder is connected to a segmented machine The first section of the barrel; the lower end of the batching barrel is integrally provided with a conical discharge funnel; the input end of the screw feeder is connected to the lower port of the discharge funnel; the middle of the discharge funnel is slidably provided with A push-pull plate; a strip-shaped sliding frame is arranged through the side of the discharge funnel; both sides of the sliding frame are provided with chute II; , so as to realize a slidable connection; the push-pull plate is provided with large, medium and small flow restrictors that can be matched with the discharge pipe; elastic baffles are arranged on both sides of the middle flow restrictor; A fixed baffle plate is respectively provided on one side of the flow restrictor and the large lower flow restrictor. 6 . The twin-screw extruder for biodegradable materials according to claim 1 , wherein the extrusion unit comprises: a large-lead twin-screw arranged in opposite directions, the axially rotatable through Set in a segmented barrel; the twin-screw external spline teeth are inclined by 1°. 7. The twin-screw extruder for biodegradable materials according to claim 1, further comprising a power unit; the power unit comprises: a feeding motor and a spindle motor; the feeding motor It is arranged in front of the feeding unit, and the spindle motor is arranged in front of the segmented barrel, and is connected with the twin-screw through a gearbox. 8 . The twin-screw extruder for biodegradable materials according to claim 1 , further comprising a heating unit; the heating unit comprises: a solenoid valve, a heater, and a temperature control meter; the There are a plurality of heaters, and they are respectively arranged in the plurality of heating cylinders. 9 . The twin-screw extruder for biodegradable materials according to claim 1 , further comprising a protection unit; the protection unit comprises: an air inlet pipe, a booster pump, an air outlet pipe, and a nitrogen tank. 10 . The input end of the booster pump is connected to the nitrogen tank through the air outlet pipe; the output end of the booster pump is connected to the first section of the segmented barrel through the air outlet pipe. 10. The twin-screw extruder for biodegradable materials according to claim 1, further comprising an operation unit; the operation unit comprises a control unit fixedly arranged on one side of the segmented barrel The control frame is provided with a display control screen.

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