CN221641726U

CN221641726U - Double-screw extruder

Info

Publication number: CN221641726U
Application number: CN202323260972.8U
Authority: CN
Inventors: 诸永伟
Original assignee: Zhangjiagang Meite Polymer Materials Co ltd
Current assignee: Zhangjiagang Meite Polymer Materials Co ltd
Priority date: 2023-11-30
Filing date: 2023-11-30
Publication date: 2024-09-03
Anticipated expiration: 2033-11-30

Abstract

The utility model discloses a double-screw extruder, wherein a first screw monomer and a second screw monomer have the same structure, the first screw monomer comprises a first main shaft, a first upstream conveying component and a first mixing component are sleeved on the first main shaft through a spline according to the conveying direction, a second upstream conveying component and a second mixing component are sleeved on the corresponding second main shaft through a spline according to the conveying direction, and a second kneading component, a second pressurizing and kneading component and a second downstream conveying component are sleeved on the corresponding second main shaft; the material cylinder is also provided with an air extraction window, the material cylinder is fixedly provided with an air extraction box body, the air extraction box body is provided with an air extraction joint communicated with the negative pressure air extraction device, and the air extraction box body is internally provided with a material cleaning device for cleaning plastic adhered on the air extraction window; this extruder can be better cut and disperse the plastics raw materials, reduce the production of impurity, can also conveniently clear up the plastics of adhesion when bleeding simultaneously.

Description

Double-screw extruder

Technical Field

The utility model relates to the technical field of screw extruders in plastic particle molding, in particular to a double-screw extruder.

Background

In the process of producing thermoplastic plastics, a double-screw extruder is needed, the structure of the double-screw extruder mainly comprises a charging barrel, one end of the charging barrel is provided with a feeding hopper, one end of the charging barrel is a discharging hole, a heating device is arranged outside the charging barrel to heat plastics in the charging barrel, a first screw monomer and a second screw monomer which rotate in the same direction are rotationally arranged in the charging barrel, the structures of the first screw monomer and the second screw monomer are the same and meshed with each other, an upstream conveying screw section, a mixing screw section, a kneading screw section and a downstream conveying screw section are arranged on the first screw monomer, raw materials are conveyed by the upstream conveying screw section and then enter the mixing screw section for mixing, the mixed raw materials are sheared and dispersed in the kneading screw section, and then are extruded by the downstream conveying screw section, the screw design of the existing double-screw extruder is unreasonable, the main problem is that the screw section mainly comprises kneading screw teeth which are arranged in a 90-degree staggered mode, the spacing between the ends of the kneading screw monomers and the inner holes of the charging barrel is smaller and identical, the kneading screw teeth are simultaneously sheared and simultaneously, and the plastic is extruded by the mixing screw section, and the mixing screw has high-temperature after the plastic is continuously mixed, and the black particles are extruded, and the black particles are always heated, and the black particles are continuously heated; the material cylinder is provided with the air extraction opening which is connected with the air extraction pipe, and because the viscosity of some plastic particles is relatively large, when the plastic particles are used for a long time, the plastic particles can be adhered to the air extraction opening due to the suction force of the air extraction opening, so that the area of the air extraction opening is reduced, the air extraction efficiency is influenced, and adhered plastic is difficult to clean.

Disclosure of utility model

The technical problems to be solved by the utility model are as follows: the utility model provides a twin-screw extruder, this extruder can be better cut and disperse the plastics raw materials, reduces the production of impurity, can also conveniently clear up the plastics of adhesion simultaneously when bleeding.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the double-screw extruder comprises a base, wherein a charging barrel is fixed on the base, a first screw monomer and a second screw monomer are rotatably installed on the charging barrel, a rotary power device for driving the first screw monomer and the second screw monomer to rotate in the same direction is fixed on the base, a charging hole is formed in the upstream end of the charging barrel, a feeding device is arranged at the charging hole, an extrusion die is fixed at the lower end of the charging barrel, the first screw monomer and the second screw monomer are identical in structure, the first screw monomer comprises a first main shaft, a first upstream conveying component and a first mixing component are sleeved on the first main shaft through splines according to the conveying direction, a second upstream conveying component and a second mixing component are sleeved on the corresponding second main shaft through the corresponding splines according to the conveying direction, and the first upstream conveying component, the second mixing component, the second pressurizing component and the second downstream conveying component are sleeved on the corresponding second main shaft;

The first upstream conveying assembly and the second upstream conveying assembly are identical in structure, the first upstream conveying assembly comprises a first upstream conveying threaded sleeve, the second upstream conveying assembly comprises a second upstream conveying threaded sleeve, and the first upstream conveying threaded sleeve and the second upstream conveying threaded sleeve are meshed with each other;

the first mixing assembly comprises a first mixing thread sleeve, the second mixing assembly comprises a second mixing thread sleeve, the first mixing thread sleeve is meshed with the second mixing thread sleeve, and the pitch of the second mixing thread sleeve is smaller than that of the first upstream conveying thread sleeve;

The first kneading assembly comprises a first kneading sleeve body, the first kneading sleeve body is sleeved on the first main shaft through a spline, a plurality of kneading teeth which are staggered at 90 degrees and are spaced are arranged on the first kneading sleeve body, and tooth surfaces of the kneading teeth are perpendicular to the axis of the first kneading sleeve body; the diameter of the contour circle where the outer end of each kneading tooth is positioned is gradually reduced according to the conveying direction; the structure of the second kneading component is the same as that of the first kneading component, and the kneading teeth on the second kneading component are meshed with the kneading teeth on the first kneading component;

The first pressurizing and kneading assembly comprises a first pressurizing and kneading sleeve body, the first pressurizing and kneading sleeve body is sleeved on the first main shaft through a spline, a plurality of pressurizing and meshing teeth are arranged on the first pressurizing and kneading sleeve body at intervals, the staggered angle of the pressurizing and meshing teeth is smaller than 90 degrees, the diameter of a contour circle where the outer end of each pressurizing and meshing tooth is located is gradually reduced according to the conveying direction, and the tooth surface of each pressurizing and meshing tooth is perpendicular to the axis of the first kneading sleeve body; the structure of the second pressurizing and kneading assembly is the same as that of the first pressurizing and kneading assembly, and the pressurizing and meshing teeth on the second pressurizing and kneading assembly are meshed with the pressurizing and meshing teeth on the first pressurizing and kneading assembly;

The structure of the first downstream conveying assembly is the same as that of the first upstream conveying assembly, and the structure of the second downstream conveying assembly is the same as that of the second upstream conveying assembly;

the plastic cleaning device is characterized in that an air extraction window is further formed in the charging barrel, an air extraction box body is fixed at the position, located at the air extraction window, of the charging barrel, an air extraction connector communicated with the negative pressure air extraction device is arranged on the air extraction box body, and a material cleaning device for cleaning plastic adhered to the air extraction window is arranged in the air extraction box body.

As a preferable scheme, the material cleaning device comprises a material cleaning block vertically arranged in the extraction box body in a lifting manner, a polytetrafluoroethylene coating is adhered to the material cleaning block, the shape of the material cleaning block is matched with that of the extraction window, the material cleaning block is driven by a vertical lifting power device to be inserted into the extraction window from top to bottom, and the material cleaning block is separated from the extraction window when being at the uppermost position.

As a preferable scheme, a mounting plate is fixed on the extraction box body, at least two guide rods are fixed at the upper end of the material clearing block, the material clearing block is vertically and slidably mounted on the mounting plate through the guide rods, a compression spring is sleeved on the guide rods and arranged between the material clearing block and the mounting plate, and the vertical lifting power device is fixed on the mounting plate.

As a preferable scheme, the vertical lifting power device comprises a linear power device which is fixed on the mounting plate and is horizontally arranged, a driving block is fixed on the power end of the linear power device, an inclined driving inclined plane is arranged at the upper end of the driving block, a vertical bar-shaped hole matched with the driving inclined plane of the driving block is formed in one corresponding guide rod, and a limiting structure for limiting the descending limit position of the clearing block is arranged on the other guide rod.

As a preferred scheme, vertical lift power device is including being fixed in the swing fulcrum on the mounting panel, the drive pendulum rod is installed in the swing on the swing fulcrum, swing fulcrum will the drive pendulum rod is divided into short arm and long arm, and the upper end of one guide bar is provided with horizontal bar hole, it has movable round pin axle to articulate on the long arm, movable pin axle inserts in the horizontal bar is downthehole, still fixed vertical driving cylinder on the mounting panel, vertical driving cylinder's piston rod down set up and with the short arm is contradicted.

As a preferred embodiment, the staggered angle of the pressing teeth is 60 °.

In a preferred embodiment, at least one of the spaces between the kneading teeth of the first kneading block is not equal to the other spaces.

As a preferred solution, the threads of the first mixing thread sleeve are provided with radially extending grooves.

As a preferred aspect, the number of the first kneading elements is one or more, and the number of the first pressure kneading elements is one or more.

After the technical scheme is adopted, the utility model has the following effects: the double-screw extruder comprises a base, wherein a charging barrel is fixed on the base, a first screw monomer and a second screw monomer are rotatably installed on the charging barrel, a rotary power device for driving the first screw monomer and the second screw monomer to rotate in the same direction is fixed on the base, a charging hole is formed in the upstream end of the charging barrel, a feeding device is arranged at the charging hole, an extrusion die is fixed at the lower end of the charging barrel, the first screw monomer and the second screw monomer are identical in structure, the first screw monomer comprises a first main shaft, a first upstream conveying component and a first mixing component are sleeved on the first main shaft through splines according to the conveying direction, a second upstream conveying component and a second mixing component are sleeved on the corresponding second main shaft through the corresponding splines according to the conveying direction, and the first upstream conveying component, the second mixing component, the second pressurizing component and the second downstream conveying component are sleeved on the corresponding second main shaft;

The material cylinder is also provided with an air extraction window, an air extraction box body is fixed at the air extraction window on the material cylinder, an air extraction joint communicated with a negative pressure air extraction device is arranged on the air extraction box body, and a material cleaning device for cleaning plastic adhered on the air extraction window is arranged in the air extraction box body; firstly, plastic raw materials enter a charging barrel through a charging hole, a charging device controls the plastic raw materials to be charged, then a first upstream conveying component and a second upstream conveying component and a first mixing component and a second mixing component extrude and convey the plastic raw materials, smooth plastic conveying is ensured, shearing and dispersing are carried out through a plurality of kneading teeth which are staggered at 90 degrees and are spaced, the diameter of a contour circle where the outer end of each kneading tooth is positioned is gradually reduced according to the conveying direction, so that smooth plastic passing through the area is facilitated, and particularly, overhigh temperature caused by long-time retention of the plastic on the charging barrel wall is avoided; in addition, the staggered angle of the pressurizing meshing teeth is smaller than 90 degrees, the diameter of the contour circle where the outer end of each pressurizing meshing tooth is positioned is gradually reduced according to the conveying direction, so that the flowing resistance of plastics in the area can be increased through the pressurizing meshing teeth, the space between the pressurizing meshing teeth and the inside of the charging barrel is increased, the shearing and dispersing time is further controlled and prolonged, the shearing and dispersing effects of plastic raw materials are ensured, and the generation of impurities is reduced; then the cleaning device is used for cleaning the plastic adhered on the air extraction window, and then the air extraction joint is used for extracting air from the inside of the charging barrel, so that the adhered plastic can be cleaned conveniently while the air extraction is carried out.

The material cleaning device comprises a material cleaning block vertically arranged in the extraction box body in a lifting manner, a polytetrafluoroethylene coating is adhered to the material cleaning block, the shape of the material cleaning block is matched with that of the extraction window, the material cleaning block is driven by the vertical lifting power device to be inserted into the extraction window from top to bottom, and the material cleaning block is separated from the extraction window when being at the uppermost position; because the material is cleared quickly and the shape of the air extraction window is adapted, the plastic adhered on the air extraction window can be extruded and cleaned simply and quickly.

The air exhaust box body is fixedly provided with a mounting plate, the upper end of the material cleaning block is fixedly provided with at least two guide rods, the material cleaning block is vertically and slidably mounted on the mounting plate through the guide rods, the guide rods are sleeved with compression springs, the compression springs are arranged between the material cleaning block and the mounting plate, and the vertical lifting power device is fixed on the mounting plate; the vertical lifting power device can drive the material clearing block to ascend, the material clearing block can be matched with the mounting plate to compress the compression spring, when the material clearing block descends, the compression spring can accelerate the descending speed to clear material attachments rapidly, and the clearing effect is improved.

And because the vertical lifting power device comprises a linear power device which is fixed on the mounting plate and is horizontally arranged, a driving block is fixed on the power end of the linear power device, an inclined driving inclined plane is arranged at the upper end of the driving block, a vertical bar-shaped hole matched with the driving inclined plane of the driving block is arranged on one corresponding guide rod, and a limiting structure for limiting the descending limit position of the clearing block is arranged on the other guide rod.

The vertical lifting power device comprises a swing fulcrum fixed on the mounting plate, a driving swing rod is arranged on the swing fulcrum in a swinging way, the driving swing rod is divided into a short arm and a long arm by the swing fulcrum, the upper end of one guide rod is provided with a horizontal bar-shaped hole, the long arm is hinged with a movable pin shaft, the movable pin shaft is inserted into the horizontal bar-shaped hole, a vertical driving air cylinder is also fixed on the mounting plate, and a piston rod of the vertical driving air cylinder is downwards arranged and is in contact with the short arm; the piston of the vertical cylinder stretches to control the up-and-down swing of the short arm so as to enable the long arm to swing up-and-down, the movable pin shaft can horizontally move in the horizontal bar-shaped hole so as to enable the guide rod to ascend and descend, the material clearing block can effectively ascend and descend, and the structure is simple and reliable.

And because the staggered angle of the pressurizing meshing teeth is 60 degrees; the flow resistance of the plastic in the area can be effectively increased between the pressurizing meshing teeth, so that the plastic can be sheared and dispersed uniformly, and the influence on the processing efficiency caused by overlarge flow resistance and slow conveying can be avoided.

And at least one of the spaces between the kneading teeth of the first kneading block is not equal to the other spaces; therefore, the plastic can flow between the meshing teeth, the shearing and dispersing effects are effectively improved, and the plastic can be accurately and effectively conveyed.

The first mixing thread sleeve is provided with a radial extending groove on the thread; therefore, the shearing effect can be effectively increased, the corresponding conveying effect can be maintained, and the production quality of shearing and dispersing of plastics can be improved.

Further, since the number of the first kneading blocks is one or more, the number of the first pressure kneading blocks is one or more; the greater the number of the first kneading members and the first pressure kneading members, the better the shearing and dispersing effects on the plastic can be achieved, and the production quality can be effectively improved.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a perspective view of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the structure of a first screw monomer and a second screw monomer according to an embodiment of the present utility model;

FIG. 3 is a half cross-sectional view of a first screw monomer and a second screw monomer according to an embodiment of the present utility model;

FIG. 4 is a schematic view showing the structure of a first kneading block, a first pressure kneading block, a second kneading block and a second pressure kneading block according to an embodiment of the present utility model;

FIG. 5 is a schematic illustration of one configuration of the pumping chamber according to an embodiment of the present utility model;

FIG. 6 is another configuration of the pumping chamber according to an embodiment of the present utility model;

In the accompanying drawings: 1. a base; 2. a feed inlet; 3. a feeding device; 4. an extrusion die; 5. a rotating electric machine; 6. a charging barrel; 7. a first spindle; 8. a second spindle; 9. a spline; 10. a first upstream delivery thread sleeve; 11. a second upstream delivery thread sleeve; 12. a first mixing thread sleeve; 13. a second mixing thread sleeve; 14. a first kneading sleeve; 15. kneading teeth; 16. a second engagement sleeve; 17. a first pressure kneading sleeve; 18. pressurizing the meshing teeth; 19. a second pressurized engagement sleeve; 20. a first downstream conveying flight; 21. a second downstream conveying screw sleeve; 22. a groove; 23. an air extraction window; 24. an extraction box body; 25. a horizontal straight cylinder; 26. an air extraction joint; 27. clearing a material block; 28. a mounting plate; 29. a guide rod; 30. a compression spring; 31. a driving block; 32. a driving inclined plane; 33. a vertical bar-shaped hole; 34. a limit nut; 35. a swing fulcrum; 36. driving the swing rod; 37. a horizontal bar-shaped hole; 38. a movable pin shaft; 39. a vertical driving cylinder; 40. the roller is driven.

Detailed Description

The present utility model will be described in further detail with reference to the following examples.

As shown in fig. 1 to 6, a twin-screw extruder comprises a base 1, a charging barrel 6 is fixed on the base 1, a first screw monomer and a second screw monomer are rotationally installed on the charging barrel 6, a rotary power device for driving the first screw monomer and the second screw monomer to rotate in the same direction is fixed on the base 1, a charging port 2 is arranged at the upstream end of the charging barrel 6, a feeding device 3 is arranged at the charging port 2, an extrusion die 4 is fixed at the lower end of the charging barrel 6, the structures of the first screw monomer and the second screw monomer are identical, the first screw monomer comprises a first main shaft 7, a first upstream conveying component, a first mixing component, a first kneading component, a first pressurizing kneading component and a first downstream conveying component are sleeved on the first main shaft 7 through splines 9 in one time according to the conveying direction, and a second upstream conveying component, a second mixing component, a second kneading component and a second pressurizing component and a second downstream conveying component are sleeved on the corresponding second main shaft 8 through the splines 9 in one time according to the conveying direction;

The first upstream conveying assembly and the second upstream conveying assembly have the same structure, the first upstream conveying assembly comprises a first upstream conveying threaded sleeve 10, the second upstream conveying assembly comprises a second upstream conveying threaded sleeve 11, and the first upstream conveying threaded sleeve 10 and the second upstream conveying threaded sleeve 11 are meshed with each other;

The first mixing assembly comprises a first mixing thread sleeve 12, the second mixing assembly comprises a second mixing thread sleeve 13, the first mixing thread sleeve 12 is meshed with the second mixing thread sleeve 13, and the thread pitch of the second mixing thread sleeve 13 is smaller than that of the first upstream conveying thread sleeve 10;

The first kneading assembly comprises a first kneading sleeve body 14, the first kneading sleeve body 14 is sleeved on the first main shaft 7 through a spline 9, a plurality of kneading teeth 15 which are staggered at 90 degrees and are spaced are arranged on the first kneading sleeve body 14, and tooth surfaces of the kneading teeth 15 are perpendicular to the axis of the first kneading sleeve body 14; the diameter of the contour circle where the outer end of each kneading tooth 15 is located gradually decreases in the conveying direction; the structure of the second kneading assembly is the same as that of the first kneading assembly, and the kneading teeth 15 on the second kneading assembly are meshed with the kneading teeth 15 on the first kneading assembly; the second kneading assembly includes a second engagement sleeve 16;

The first pressurizing and kneading assembly comprises a first pressurizing and kneading sleeve body 17, the first pressurizing and kneading sleeve body 17 is sleeved on the first main shaft 7 through a spline 9, a plurality of pressurizing and meshing teeth 18 are arranged on the first pressurizing and kneading sleeve body 17 at intervals, the staggered angle of the pressurizing and meshing teeth 18 is smaller than 90 degrees, the diameter of a contour circle where the outer ends of the pressurizing and meshing teeth 18 are positioned is gradually reduced according to the conveying direction, and the tooth surfaces of the pressurizing and meshing teeth 18 are perpendicular to the axis of the first kneading sleeve body 14; the structure of the second pressure kneading assembly is the same as that of the first pressure kneading assembly, and the pressure engaging teeth 18 on the second pressure kneading assembly are engaged with the pressure engaging teeth 18 on the first pressure kneading assembly; the second pressure engagement assembly includes a second pressure engagement sleeve 19;

The feeding device 3 firstly puts plastic raw materials into the feeding hole 2, the first screw single body and the second screw single body can be driven to rotate in the same direction through the rotary power device, the rotary power device comprises a rotary motor 5, the rotary motor 5 is arranged on the machine base 1 to drive the first main shaft 7 and the second main shaft 8 to rotate in the same direction, the first upstream conveying thread sleeve 10 and the second upstream conveying thread sleeve 11 can convey plastic at first and simultaneously carry out preliminary extrusion at the beginning stage, so that the plastic is preliminarily dispersed, then the first mixing thread sleeve 12 and the second mixing thread sleeve 13 further carry out extrusion dispersion on the plastic on the basis of the front, simultaneously reduce the conveying speed, and then the plastic is sheared and dispersed through a plurality of kneading teeth 15 which are staggered at 90 degrees and are spaced, so that the plastic is further sheared and dispersed uniformly, the diameter of a contour circle where the outer end of each kneading tooth 15 is positioned is gradually reduced according to the conveying direction, the plastic can conveniently and smoothly pass through the area, and particularly, the plastic is prevented from being stopped on the wall of the material cylinder 6 for a long time and causing overhigh temperature; in addition, the staggered angle of the pressurizing engaging teeth 18 is smaller than the diameter of the contour circle where the outer end of each pressurizing engaging tooth 18 is positioned is gradually reduced according to the conveying direction, so that the flowing resistance of the plastic in the area can be increased through the pressurizing engaging teeth 18, the space between the pressurizing engaging teeth 18 and the inside of the charging barrel 6 is increased, the shearing and dispersing time is further controlled and prolonged, the shearing and dispersing effect of the plastic raw materials is ensured, and the generation of impurities is reduced; finally, the cut and dispersed plastic is conveyed out by a first downstream conveying assembly and a second downstream conveying assembly, wherein the first downstream conveying assembly comprises a first downstream conveying thread sleeve 20, the second downstream conveying assembly comprises a second downstream conveying thread sleeve 21, and the first downstream conveying thread sleeve 20 and the second downstream conveying thread sleeve 21 are the same as the first upstream conveying thread sleeve 10 and the second upstream conveying thread sleeve 11 to extrude and convey the cut and dispersed plastic.

An air extraction window 23 is further formed in the charging barrel 6, an air extraction box 24 is fixed at the position, located at the air extraction window 23, of the charging barrel 6, an air extraction connector 26 communicated with a negative pressure air extraction device is arranged on the air extraction box 24, and a material cleaning device for cleaning plastic adhered on the air extraction window 23 is arranged in the air extraction box 24; the plastic adhered on the air suction window 23 is cleaned by the material cleaning device, and then the interior of the charging barrel 6 is sucked by the air suction joint 26.

As shown in fig. 5, the material cleaning device comprises a material cleaning block 27 vertically lifted and installed in the air extraction box 24, a polytetrafluoroethylene coating is adhered to the material cleaning block 27, the shape of the material cleaning block 27 is matched with that of the air extraction window 23, the material cleaning block 27 is driven by a vertical lifting power device to be inserted into the air extraction window 23 from top to bottom, and the material cleaning block 27 is separated from the air extraction window 23 when being at the uppermost position; because the clear material is fast with the shape adaptation of air extraction window 23, just can extrude the clearance to the plastics that adhere on the air extraction window 23, it is simple swift to clear material piece 27 is in the time of the top position and breaks away from air extraction window 23, conveniently carries out the air extraction after the clearance like this.

Further, a mounting plate 28 is fixed on the extraction box 24, at least two guide rods 29 are fixed at the upper end of the material cleaning block 27, the material cleaning block 27 is vertically and slidably mounted on the mounting plate 28 through the guide rods 29, a compression spring 30 is sleeved on the guide rods 29, the compression spring 30 is arranged between the material cleaning block 27 and the mounting plate 28, and the vertical lifting power device is fixed on the mounting plate 28; the vertical lifting power device can drive the material clearing block 27 to ascend, the material clearing block 27 can be matched with the mounting plate 28 to compress the compression spring 30, when the material clearing block 27 descends, the compression spring 30 can accelerate the descending speed to clear material attachments rapidly, the clearing effect is improved, the guide rod 29 can ensure that the material clearing block 27 ascends and descends stably, and the use is ensured.

In this embodiment, the vertical lifting power device includes a linear power device fixed on the mounting plate 28 and arranged horizontally, a driving block 31 is fixed on the power end of the linear power device, an inclined driving inclined plane 32 is provided at the upper end of the driving block 31, a vertical bar-shaped hole 33 matched with the driving inclined plane 32 of the driving block 31 is provided on one corresponding guiding rod 29, and a limit structure for limiting the descending limit position of the cleaning block 27 is provided on the other guiding rod 29; the driving block 31 is driven to linearly move through the linear power device so as to drive the guide rod 29 to lift through being matched with the vertical strip-shaped hole 33, the driving inclined surface 32 can slowly jack up the vertical strip-shaped hole 33, so that the compression spring 30 is controlled, meanwhile, the limiting structure can prevent the falling distance of the material clearing block 27 from being too large, and the use effect is ensured; the linear power device is a horizontal linear cylinder 25, and drives the driving block 31 to move horizontally.

Further, the limiting structure is a limiting nut 34 fixed on the guide rod 29, and when the limiting nut 34 is in contact fit with the upper surface of the mounting plate 28, the upper end of the vertical bar-shaped hole 33 is higher than the upper surface of the mounting plate 28; thus, when the driving block 31 moves, the driving block can be effectively inserted into the vertical strip-shaped hole 33 to enable the cleaning block 27 to ascend, so that the using effect is ensured.

As shown in fig. 6, the vertical lifting power device comprises a swing fulcrum 35 fixed on a mounting plate 28, a driving swing rod 36 is installed on the swing fulcrum 35 in a swinging manner, the swing fulcrum 35 divides the driving swing rod 36 into a short arm and a long arm, a horizontal bar-shaped hole 37 is formed in the upper end of one guide rod 29, a movable pin 38 is hinged to the long arm, the movable pin 38 is inserted into the horizontal bar-shaped hole 37, a vertical driving air cylinder 39 is also fixed on the mounting plate 28, and a piston rod of the vertical driving air cylinder 39 is arranged downwards and is in contact with the short arm; the vertical cylinder piston stretches and contracts to control the short arm to swing up and down, so that the long arm swings up and down, the movable pin 38 horizontally moves in the horizontal bar-shaped hole 37 to enable the guide rod 29 to ascend and descend, the material cleaning block 27 can effectively ascend and descend, and the structure is simple and reliable.

Further, a driving roller 40 is installed on a piston rod of the vertical driving cylinder 39; therefore, the device can flexibly contact with the short arm, friction is reduced, and efficiency is improved.

In this embodiment, the staggering angle of the pressurizing teeth 18 is 60 °, and the smaller the staggering angle is, the better the shearing and dispersing effects are, so that the flow resistance of the plastic in the region can be effectively increased between the pressurizing teeth 18, the plastic can be sheared and dispersed more uniformly, and the influence on the processing efficiency caused by overlarge flow resistance and slow conveying can be avoided.

Further, at least one of the pitches between the kneading teeth 15 of the first kneading block is not equal to the other pitches; therefore, the plastic can flow between the meshing teeth, the shearing and dispersing effects are effectively improved, and the plastic can be accurately and effectively conveyed.

As shown in fig. 2, the threads of the first mixing thread sleeve 12 are provided with radially extending grooves 22; therefore, the shearing capacity of the first mixing thread sleeve 12 is effectively improved, and meanwhile, the corresponding groove 22 is formed in the second mixing thread sleeve 13, so that preliminary shearing can be performed before shearing, and shearing dispersion effect is submitted.

Further, the number of the first kneading blocks is one or more, and the number of the first pressure kneading blocks is one or more; the greater the number of the first kneading members and the first pressure kneading members, the better the shearing and dispersing effects on the plastic can be achieved, and the production quality can be effectively improved.

The working principle of the embodiment is as follows: firstly, a feeding device 3 firstly puts plastic raw materials into a feeding hole 2, a rotating motor 5 drives a first main shaft 7 and a second main shaft 8 to rotate, then a first upstream conveying thread sleeve 10 and a second upstream conveying thread sleeve 11 are led to mesh and rotate in the opposite direction to extrude and convey the plastic, a first mixing thread sleeve 12 and a second mixing thread sleeve 13 are meshed and rotate in the opposite direction to further extrude, shear and convey the plastic, meshing teeth on a first meshing sleeve body and a second meshing sleeve body 16 are meshed with each other to shear and disperse the plastic, the forward conveying is continued, pressurizing meshing teeth 18 on a first pressurizing meshing sleeve body and a second pressurizing meshing sleeve body 19 are meshed with each other to shear and disperse the plastic, meanwhile, the conveying speed is slowed down, and finally a first downstream conveying thread sleeve 20 and a second downstream conveying thread sleeve 21 are matched with each other to convey the plastic; at the air extraction window 23, the piston rod of the horizontal linear air cylinder 25 extends out, the driving block 31 is driven to be matched with the vertical bar-shaped hole 33 of the guide rod 29, the material cleaning block 27 rises, then the piston rod is quickly retracted, the compression spring 30 releases pressure, the material cleaning block 27 is driven to quickly descend and fall into the air extraction window 23, then the piston rod extends out again to drive the material cleaning block 27 to rise, and air extraction is started through the air extraction joint 26.

The above examples are merely illustrative of the preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model, and various modifications and adaptations of the technical solution of the present utility model should and are intended to fall within the scope of the present utility model as defined in the claims.

Claims

1. The utility model provides a twin-screw extruder, includes the frame, be fixed with the feed cylinder on the frame, first screw rod monomer and second screw rod monomer are installed to the feed cylinder internal rotation, be fixed with the rotatory power device of drive first screw rod monomer and second screw rod monomer syntropy on the frame, the upstream end of feed cylinder is provided with the feed inlet, feed inlet department is provided with feed arrangement, the lower extreme of feed cylinder is fixed with extrusion die, its characterized in that: the first screw monomer and the second screw monomer have the same structure, the first screw monomer comprises a first main shaft, a first upstream conveying component and a first mixing component are sleeved on the first main shaft through a spline according to the conveying direction, a first kneading component, a first pressurizing kneading component and a first downstream conveying component are sleeved on a corresponding second main shaft through a spline according to the conveying direction, and a second upstream conveying component and a second mixing component are sleeved on the corresponding second main shaft, and a second kneading component, a second pressurizing kneading component and a second downstream conveying component are sleeved on the corresponding second main shaft;

2. A twin screw extruder as defined in claim 1, wherein: the material cleaning device comprises a material cleaning block vertically installed in the air extraction box body in a lifting mode, a polytetrafluoroethylene coating is adhered to the material cleaning block, the shape of the material cleaning block is matched with that of the air extraction window, the material cleaning block is driven by the vertical lifting power device to be inserted into the air extraction window from top to bottom, and the material cleaning block is separated from the air extraction window when being at the uppermost position.

3. A twin screw extruder as defined in claim 2, wherein: the air extraction box is characterized in that a mounting plate is fixed on the air extraction box body, at least two guide rods are fixed at the upper end of the material clearing block, the material clearing block is vertically and slidably mounted on the mounting plate through the guide rods, a compression spring is sleeved on the guide rods and arranged between the material clearing block and the mounting plate, and the vertical lifting power device is fixed on the mounting plate.

4. A twin screw extruder as defined in claim 3, wherein: the vertical lifting power device comprises a linear power device which is fixed on the mounting plate and is horizontally arranged, a driving block is fixed on the power end of the linear power device, an inclined driving inclined plane is arranged at the upper end of the driving block, a vertical bar-shaped hole matched with the driving inclined plane of the driving block is formed in one corresponding guide rod, and a limiting structure for limiting the descending limit position of the clearing block is arranged on the other guide rod.

5. A twin screw extruder as defined in claim 3, wherein: the vertical lifting power device comprises a swing fulcrum fixed on a mounting plate, a driving swing rod is installed on the swing fulcrum in a swinging mode, the driving swing rod is divided into a short arm and a long arm by the swing fulcrum, a horizontal bar-shaped hole is formed in the upper end of one guide rod, a movable pin shaft is hinged to the long arm and inserted into the horizontal bar-shaped hole, a vertical driving cylinder is further fixed on the mounting plate, and a piston rod of the vertical driving cylinder is arranged downwards and is in collision with the short arm.

6. A twin screw extruder as defined in claim 4 or 5, wherein: the staggered angle of the pressing teeth is 60 °.

7. A twin screw extruder as defined in claim 6, wherein: at least one of the spaces between the kneading teeth of the first kneading block is not equal to the other spaces.

8. A twin screw extruder as defined in claim 7, wherein: the threads of the first mixing thread sleeve are provided with radially extending grooves.

9. A twin screw extruder as defined in claim 8, wherein: the number of the first kneading components is one or more, and the number of the first pressure kneading components is one or more.