Twin-screw extrusion equipment

Abstract

The invention is suitable for the related technical field of twin-screw extrusion equipment, and provides twin-screw extrusion equipment which comprises a base, a first motor is fixedly connected to the base, a thread part is fixedly connected to the side face of a first rotating shaft and comprises a sparse end and a dense end, and an extrusion box is arranged on the outer side of the thread part; a plurality of scraping plates used for scraping raw materials of the threaded part are arranged on the extrusion box body, an upper cover is arranged at the upper end of the extrusion box body, the upper cover is connected with the scraping plates through a downward pressing unit, and a displacement unit used for performing displacement on the threaded part is arranged at the upper end of each scraping plate. Raw materials enter the extrusion box body through the feeding port and are extruded forwards under the action of the threaded part, the scraping plate moves on the threaded part along with rotation of the threaded part under the action of the displacement unit, the raw materials on the surface of the threaded part are scraped, the pressing unit enables the scraping plate to keep proper pressure with the threaded part all the time, and the scraping effect is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field related to twin-screw extrusion equipment, and in particular relates to a twin-screw extrusion equipment. Background Art

[0002] The twin-screw extruder is developed on the basis of the single-screw extruder. Due to its good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability and other characteristics, it has been widely used in the molding processing of extruded products. The molding processing of masterbatch is also processed by a twin-screw extruder. Waste plastic is a raw material for the production of masterbatch. Waste plastic is recycled, mixed and crushed, granulated, formulated, extruded and molded, and finally made into recycled black masterbatch or other types of masterbatch.

[0003] After searching, a Chinese patent entitled A Twin-Screw Extrusion Equipment with a publication number of CN220242339U was found. The anti-sticking device is set. When the anti-sticking device is used, the rectangular bar rotates on the surface of the rotating rod, so that the rubber block hits the surface of the feed hopper, and the raw material adhering to the inner wall of the feed hopper can be shaken off. This solves the problem that when the twin-screw extruder is used, the raw material is added to the inside of the extrusion device through the feed hopper. However, in actual use, the raw material is easily adhered to the inner wall of the feed hopper, which is very difficult to clean, and it will also affect the ratio of the raw materials entering the feed hopper next time, which may affect the molding process of the extruded product. However, when the above-mentioned device is actually used, there are some shortcomings. After the twin screw extruder extrudes the material, there will be residual raw materials in the gap of the twin screws. When the operation is started again, it will have an adverse effect on the extrusion efficiency of the twin screw, and seriously cause blockage to the entire device. Based on this, a twin-screw extruder that can solve the above problems is now proposed. Summary of the invention

[0004] The present invention provides a twin-screw extruder, aiming to solve the problem that after the twin-screw extruder performs an extrusion operation on a material, residual raw materials will exist in the gap between the twin-screws, which will have an adverse effect on the extrusion efficiency of the twin-screws when the operation is started again, and in serious cases, will cause blockage to the entire device.

[0005] The present invention is implemented as follows: a twin-screw extruder comprises a base, a first motor is fixedly connected to the base, a lubrication part is fixedly connected to the output end of the first motor, the lubrication part is connected to two first rotating shafts through a reducer connecting part, a threaded part is fixedly connected to the side of the first rotating shaft, the threaded part is a sparse end and a dense end, an extrusion box is arranged on the outer side of the threaded part, a plurality of feed ports for feeding are arranged on the extrusion box, a plurality of scraping plates for scraping raw materials from the threaded part are arranged on the extrusion box, a through opening is opened at the upper end of the extrusion box, an upper cover is arranged at the upper end of the extrusion box, the upper cover is connected to the scraping plate through a pressing unit, and a displacement unit for displacing on the threaded part is arranged at the upper end of the scraping plate.

[0006] Preferably, multiple scraping plates are vertically arranged, and the thread pitch of the threaded part is 15 threads; a heating part for heating the raw materials is fixedly connected to the extrusion box, a plurality of supporting legs are fixedly connected to the lower end of the base, an observation panel is provided on the extrusion box, a first scraping protrusion is fixedly connected to the side of the scraping plate, a first through groove for passing the scraping plate is provided on the upper cover, and the upper cover is connected to the extrusion box through an adjustment unit.

[0007] Preferably, the pressing unit comprises a plurality of first guide rods symmetrically arranged and fixedly connected to the upper cover, a pressing plate is sleeved on the outer sides of the plurality of first guide rods, the upper ends of the first guide rods on both sides are fixedly connected with first connecting plates, the upper ends of the pressing plates are connected to the first connecting plates via a plurality of first springs for providing elastic force, the first springs are sleeved on the outer sides of the first guide rods, and a blocking plate for blocking the scraper plate is fixedly connected to the side of the extrusion box.

[0008] Preferably, the displacement unit includes a plurality of groups of symmetrically arranged second through grooves opened on the lower pressure plate, the length of the second through grooves is divided into a long groove and a short groove, the long groove and the short groove correspond to the sparse end and the dense end respectively, a second guide rod is fixedly connected in the second through groove, a moving block is sleeved on the outer side of the second guide rod, the side wall of the moving block contacts the side wall of the second through groove, the moving block is connected to the side wall of the second through groove through a second spring for providing elastic force, the second spring is sleeved on the outer side of the second guide rod, the lower end of the moving block is fixedly connected to the scraper plate, the scraper plate is divided into a wide plate and a narrow plate, and the wide plate and the narrow plate correspond to the sparse end and the dense end respectively.

[0009] Preferably, a lifting unit for lifting the scraper plate is provided on the upper cover.

[0010] Preferably, the lifting unit includes a second motor, which is fixedly connected to the upper cover through a first connecting rod, and the output end of the second motor is fixedly connected to a rotating gear, on which incomplete gear teeth are arranged, and the side of the lower pressure plate is fixedly connected to a second connecting plate, and the side of the second connecting plate is provided with straight gear teeth meshing with the incomplete gear teeth, and the incomplete gear teeth can drive the straight gear teeth to move in a vertical direction.

[0011] Preferably, the adjusting unit includes third connecting plates fixedly connected to the two sides of the extrusion box, a third motor is fixedly connected to one of the third connecting plates, a reciprocating screw is fixedly connected to the output end of the third motor, the end of the reciprocating screw is rotatably connected to the third connecting plate, a reciprocating slider is sleeved on the outer side of the reciprocating screw, the reciprocating slider is fixedly connected to the upper cover, a limiting rod is fixedly connected between the two third connecting plates, the limiting rod passes through the reciprocating slider, and the reciprocating slider can drive the upper cover to move in the horizontal direction.

[0012] Preferably, a scraping unit is provided on the side of the scraping plate, and the scraping unit includes a plurality of second scraping protrusions symmetrically arranged on both sides of the scraping plate, and the scraping plate is provided with grooves adapted to the second scraping protrusions, and a third guide rod is fixedly connected in the groove, and the third guide rod is inserted in a movable groove provided on the second scraping protrusion, and the second scraping protrusion is connected to the groove through a third spring for providing elastic force, and the third spring is sleeved on the outside of the third guide rod.

[0013] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0014] 1. Through the setting of the pressing unit, the elastic force of the first spring ensures that when the raw material scraping operation is not performed, the lower end of the scraping plate is in contact with the blocking plate, and when the raw material scraping operation is performed, the scraping plate is in contact with the first rotating shaft and the threaded portion to perform the scraping operation on the raw material;

[0015] 2. Through the setting of the displacement unit, when the threaded part rotates, it will bring the scraper plate a horizontal feed amount, which will drive the moving block to move in the direction of the second guide rod. Under the action of the second spring, the scraper plate can contact the side of the threaded part to better scrape the raw materials;

[0016] 3. Through the setting of the lifting unit, when the equipment needs to be maintained or the scraper plate needs to be replaced, the scraper plate can be lifted up through the lifting unit. In addition, because the displacement distance of the displacement unit is limited, the lifting unit can adapt to the rotation of the threaded part when the threaded part rotates to drive the scraper plate to move up and down, ensuring the normal operation of the scraper plate; the adjustment unit can adjust the position of the upper cover to facilitate cleaning and maintenance of the inside of the equipment;

[0017] 4. Through the setting of the scraping unit, when the scraping plate performs scraping operation, the second scraping protrusion can be moved out of the groove in the direction of the third guide rod under the elastic force of the third spring, so that multiple second scraping protrusions can adapt to the curvature of the threaded portion, and can further perform raw material scraping operations on the threaded portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a twin-screw extruder provided by the present invention. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of a twin-screw extruder provided by the present invention. Figure 2 ;

[0020] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0021] Figure 4 It is a structural schematic diagram of a threaded portion in a twin-screw extruder provided by the present invention;

[0022] Figure 5 It is a partial structural schematic diagram of a twin-screw extruder provided by the present invention;

[0023] Figure 6 yes Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0024] Figure 7 yes Figure 5 Schematic diagram of the enlarged structure at C in the middle;

[0025] Figure 8 It is a structural schematic diagram of a scraping unit in a twin-screw extruder provided by the present invention.

[0026] Notes on reference numerals: 1. base; 2. first motor; 3. lubrication part; 4. reducer connection part; 5. first rotating shaft; 6. sparse end; 7. dense end; 8. extrusion box; 9. feed port; 10. scraper plate; 11. through-hole; 12. upper cover; 13. heating part; 14. first through-groove; 15. first guide rod; 16. lower pressure plate; 17. first connecting plate; 18. first spring; 19. blocking plate; 20. second through-groove; 21. second guide rod; 22. moving block ; 23. Second spring; 24. Second motor; 25. First connecting rod; 26. Rotating gear; 27. Incomplete gear teeth; 28. Second connecting plate; 29. ​​Straight gear teeth; 30. Third connecting plate; 31. Third motor; 32. Reciprocating screw rod; 33. Reciprocating slider; 34. Limit rod; 35. Support leg; 36. Observation panel; 37. First scraping protrusion; 38. Second scraping protrusion; 39. Groove; 40. Third guide rod; 41. Moving groove; 42. Third spring. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] The embodiment of the present invention provides a twin-screw extruder, such as Figure 1-Figure 8As shown, it includes a base 1, on which a first motor 2 is fixedly connected, and an output end of the first motor 2 is fixedly connected to a lubrication part 3, and the lubrication part 3 is connected to two first rotating shafts 5 through a reducer connecting part 4, and a threaded part is fixedly connected to the side of the first rotating shaft 5, and the threaded part is composed of a sparse end 6 and a dense end 7, and an extrusion box 8 is arranged on the outer side of the threaded part, and a plurality of feeding ports 9 for feeding are arranged on the extrusion box 8, and a plurality of scraping plates 10 for scraping raw materials from the threaded part are arranged on the extrusion box 8, and a through-hole 11 is opened at the upper end of the extrusion box 8, and an upper cover 12 is arranged on the upper end of the extrusion box 8, and the upper cover 12 is connected to the scraping plate 10 through a pressing unit, and the upper end of the scraping plate 10 is provided with a displacement unit for displacement on the threaded part.

[0030] The thread gap of the present application is increased from 50 threads according to the international standard to 15-20 threads, realizing non-auxiliary ultra-fine dispersion, so that the pigment particles can be effectively dispersed to the original particle size, and better quality masterbatch raw materials can be processed.

[0031] A plurality of scraper plates 10 are vertically arranged; a heating portion 13 for heating the raw materials is fixedly connected to the extrusion box 8, a plurality of supporting legs 35 are fixedly connected to the lower end of the base 1, an observation panel 36 is arranged on the extrusion box 8, a first through groove 14 for passing the scraper plates 10 is arranged on the upper cover 12, and the upper cover 12 is connected to the extrusion box 8 through an adjustment unit.

[0032] When the above device is actually used, when it is working, the first motor 2 is started, and the first rotating shaft 5 and the threaded part are driven to rotate through the lubrication part 3 and the reducer connection part 4. The raw material enters the extrusion box 8 through the feed port 9, and is extruded forward under the action of the threaded part. At the same time, the scraper plate 10 is displaced on the threaded part as the threaded part rotates under the action of the displacement unit, and the raw material on the surface of the threaded part is scraped off. The pressing unit makes the scraper plate 10 always maintain a suitable pressure with the threaded part to ensure the scraping effect.

[0033] Combination Figure 5 and Figure 7 The pressing unit includes a plurality of first guide rods 15 symmetrically arranged and fixedly connected to the upper cover 12, a pressing plate 16 is sleeved on the outer side of the plurality of first guide rods 15, the upper ends of the first guide rods 15 on both sides are fixedly connected with first connecting plates 17, the upper ends of the pressing plates 16 are connected to the first connecting plates 17 through a plurality of first springs 18 for providing elastic force, the first springs 18 are sleeved on the outer side of the first guide rods 15, and a blocking plate 19 for blocking the scraper plate 10 is fixedly connected to the side of the extrusion box 8.

[0034] When the above-mentioned pressing unit is actually used, the elastic force of the first spring 18 ensures that when the raw material scraping operation is not performed, the lower end of the scraping plate 10 is in contact with the blocking plate 19, and when the raw material scraping operation is performed, the scraping plate 10 is in contact with the first rotating shaft 5 and the threaded part to scrape the raw material.

[0035] The displacement unit includes a plurality of groups of symmetrically arranged second through grooves 20 opened on the lower pressure plate 16, the length of the second through grooves 20 is divided into a long groove and a short groove, the long groove and the short groove correspond to the sparse end 6 and the dense end 7 respectively, a second guide rod 21 is fixedly connected in the second through groove 20, a moving block 22 is sleeved on the outer side of the second guide rod 21, the side wall of the moving block 22 contacts the side wall of the second through groove 20, the moving block 22 is connected to the side wall of the second through groove 20 through a second spring 23 for providing elastic force, the second spring 23 is sleeved on the outer side of the second guide rod 21, the lower end of the moving block 22 is fixedly connected to the scraper plate 10, the scraper plate 10 is divided into a wide plate and a narrow plate, and the wide plate and the narrow plate correspond to the sparse end 6 and the dense end 7 respectively.

[0036] When the above-mentioned displacement unit is actually used, the rotation of the threaded portion will bring a horizontal feed amount to the scraper plate 10, which will drive the moving block 22 to move in the direction of the second guide rod 21. Under the action of the second spring 23, the scraper plate 10 can contact the side of the threaded portion to better perform the raw material scraping operation.

[0037] The upper cover 12 is provided with a lifting unit for lifting the scraper plate 10 .

[0038] The lifting unit includes a second motor 24, which is fixedly connected to the upper cover 12 through a first connecting rod 25. The output end of the second motor 24 is fixedly connected to a rotating gear 26, and the rotating gear 26 is provided with incomplete gear teeth 27. The side of the lower pressure plate 16 is fixedly connected to a second connecting plate 28, and the side of the second connecting plate 28 is provided with straight gear teeth 29 meshing with the incomplete gear teeth 27. The incomplete gear teeth 27 can drive the straight gear teeth 29 to move in the vertical direction.

[0039] The lifting unit has two functions. When the equipment needs to be maintained or the scraper plate 10 needs to be replaced, the scraper plate 10 can be lifted up by the lifting unit. Secondly, because the displacement distance of the displacement unit is limited, the lifting unit can adapt to the rotation of the threaded part when the threaded part rotates to drive the scraper plate 10 to move up and down, thereby ensuring the normal operation of the scraper plate 10; the adjustment unit can adjust the position of the upper cover 12, which is convenient for cleaning and maintenance of the inside of the equipment.

[0040] Combination Figure 3 The adjusting unit includes third connecting plates 30 symmetrically arranged and fixedly connected to both sides of the extrusion box 8, one of the third connecting plates 30 is fixedly connected to a third motor 31, and a reciprocating screw rod 32 is fixedly connected to the output end of the third motor 31, and the end of the reciprocating screw rod 32 is rotatably connected to the third connecting plate 30, and a reciprocating slider 33 is sleeved on the outer side of the reciprocating screw rod 32, and the reciprocating slider 33 is fixedly connected to the upper cover 12, and a limiting rod 34 is fixedly connected between the two third connecting plates 30, and the limiting rod 34 passes through the reciprocating slider 33, and the reciprocating slider 33 can drive the upper cover 12 to move in the horizontal direction.

[0041] When the above-mentioned adjustment unit is actually used, in order to ensure the normal progress of the extrusion operation, when the extrusion operation is performed, the upper cover 12 is driven by the reciprocating slider 33 and is located above the through-port 11 to block it; when the threaded portion needs to be scraped by the scraper plate 10, the third motor 31 rotates to drive the reciprocating screw 32 to rotate and then drives the reciprocating slider 33 to move, so as to drive the upper cover 12 to move, so that the first through groove 14 corresponds to the position of the through-port 11, which is convenient for the scraping operation.

[0042] A first scraping protrusion 37 is fixedly connected to the side surface of the scraping plate 10 .

[0043] Combination Figure 6 and Figure 8 In order to further scrape the raw material on the threaded portion and improve the adaptability of the scraper plate 10, a scraper unit is provided on the side of the scraper plate 10, and the scraper unit includes a plurality of second scraping protrusions 38 symmetrically arranged on both sides of the scraper plate 10, and the scraper plate 10 is provided with a groove 39 adapted to the second scraping protrusion 38, and a third guide rod 40 is fixedly connected in the groove 39, and the third guide rod 40 is inserted in a movable groove 41 provided on the second scraping protrusion 38, and the second scraping protrusion 38 is connected to the groove 39 by a third spring 42 for providing elastic force, and the third spring 42 is sleeved on the outside of the third guide rod 40.

[0044] When the scraper plate 10 performs a scraping operation, the second scraping protrusions 38 can be moved out of the groove 39 in the direction of the third guide rod 40 under the elastic force of the third spring 42, so that multiple second scraping protrusions 38 can adapt to the curvature of the threaded portion and can further scrape the raw material on the threaded portion.

[0045] In summary, the working principle of the present invention is as follows: when working, the first motor 2 is started, and the first rotating shaft 5 and the threaded part are driven to rotate through the lubrication part 3 and the reducer connection part 4. The raw material enters the extrusion box 8 through the feed port 9, and is extruded forward under the action of the threaded part. At the same time, the scraper plate 10 is displaced on the threaded part as the threaded part rotates under the action of the displacement unit, and the raw material on the surface of the threaded part is scraped off. The downward pressure unit makes the scraper plate 10 always maintain a suitable pressure with the threaded part to ensure the scraping effect. In order to ensure the normal extrusion operation, when the extrusion operation is performed, the upper cover 12 is driven by the reciprocating slider 33 to be above the through-port 11 to block it. The scraper plate 10 is required to perform a certain pressure on the threaded part. When performing the scraping operation, the third motor 31 rotates to drive the reciprocating screw 32 to rotate and then drive the reciprocating slider 33 to move, so as to drive the upper cover 12 to move, so that the first through groove 14 corresponds to the position of the through opening 11, which is convenient for the scraping operation; when the scraping plate 10 performs the scraping operation, the second scraping protrusion 38 can be moved out of the groove 39 in the direction of the third guide rod 40 under the elastic force of the third spring 42, so that the multiple second scraping protrusions 38 can adapt to the curvature of the threaded portion, and can further perform the raw material scraping operation on the threaded portion.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A twin-screw extruder, comprising a base (1), characterized in that: A first motor (2) is fixedly connected to the base (1); a lubrication part (3) is fixedly connected to the output end of the first motor (2); the lubrication part (3) is connected to two first rotating shafts (5) via a reducer connecting part (4); a threaded part is fixedly connected to the side of the first rotating shaft (5); the threaded part is composed of a sparse end (6) and a dense end (7); an extrusion box (8) is arranged on the outer side of the threaded part; a plurality of feed ports (9) for feeding are arranged on the extrusion box (8); a plurality of scraping plates (10) for scraping raw materials from the threaded part are arranged on the extrusion box (8); a through opening (11) is opened at the upper end of the extrusion box (8); an upper cover (12) is arranged at the upper end of the extrusion box (8); the upper cover (12) is connected to the scraping plate (10) via a pressing unit; and a displacement unit for displacing on the threaded part is arranged at the upper end of the scraping plate (10).

2. A twin-screw extruder as claimed in claim 1, characterized in that: The plurality of scraping plates (10) are arranged vertically, and the thread pitch of the threaded portion is 15-20 threads.

3. A twin-screw extruder as claimed in claim 1, characterized in that: A heating portion (13) for heating the raw material is fixedly connected to the extrusion box (8), a plurality of supporting legs (35) are fixedly connected to the lower end of the base (1), an observation panel (36) is provided on the extrusion box (8), and a first scraping protrusion (37) is fixedly connected to the side of the scraping plate (10).

4. A twin-screw extruder as claimed in claim 1, characterized in that: The upper cover (12) is provided with a first through groove (14) for passing the scraper plate (10), and the upper cover (12) is connected to the extrusion box (8) via an adjustment unit.

5. A twin-screw extruder as claimed in claim 1, characterized in that: The pressing unit comprises a plurality of first guide rods (15) symmetrically arranged and fixedly connected to the upper cover (12); a pressing plate (16) is sleeved on the outer sides of the plurality of first guide rods (15); the upper ends of the first guide rods (15) on both sides are fixedly connected to first connecting plates (17); the upper ends of the pressing plates (16) are connected to the first connecting plates (17) via a plurality of first springs (18) for providing elastic force; the first springs (18) are sleeved on the outer sides of the first guide rods (15); and a blocking plate (19) for blocking the scraping plate (10) is fixedly connected to the side of the extrusion box (8).

6. A twin-screw extruder as claimed in claim 5, characterized in that: The displacement unit comprises a plurality of groups of symmetrically arranged second through grooves (20) opened on the lower pressure plate (16), the length of the second through grooves (20) being divided into a long groove and a short groove, the long groove and the short groove corresponding to the sparse end (6) and the dense end (7) respectively, a second guide rod (21) being fixedly connected inside the second through groove (20), a moving block (22) being sleeved on the outer side of the second guide rod (21), a side wall of the moving block (22) being in contact with the side wall of the second through groove (20), the moving block (22) being connected to the side wall of the second through groove (20) via a second spring (23) for providing elastic force, the second spring (23) being sleeved on the outer side of the second guide rod (21), the lower end of the moving block (22) being fixedly connected to the scraper plate (10), the scraper plate (10) being divided into a wide plate and a narrow plate, the wide plate and the narrow plate corresponding to the sparse end (6) and the dense end (7) respectively.

7. A twin-screw extruder as claimed in claim 6, characterized in that: The upper cover (12) is provided with a lifting unit for lifting the scraper plate (10).

8. A twin-screw extruder as claimed in claim 7, characterized in that: The lifting unit comprises a second motor (24), the second motor (24) being fixedly connected to the upper cover (12) via a first connecting rod (25), the output end of the second motor (24) being fixedly connected to a rotating gear (26), the rotating gear (26) being provided with incomplete gear teeth (27), the side surface of the lower pressure plate (16) being fixedly connected to a second connecting plate (28), the side surface of the second connecting plate (28) being provided with straight gear teeth (29) meshing with the incomplete gear teeth (27), the incomplete gear teeth (27) being able to drive the straight gear teeth (29) to move in a vertical direction.

9. A twin-screw extruder as claimed in claim 4, characterized in that: The adjustment unit comprises third connecting plates (30) fixedly connected to two sides of the extrusion box (8) and symmetrically arranged, one of the third connecting plates (30) being fixedly connected to a third motor (31), an output end of the third motor (31) being fixedly connected to a reciprocating screw rod (32), an end of the reciprocating screw rod (32) being rotatably connected to the third connecting plate (30), a reciprocating slider (33) being sleeved on the outer side of the reciprocating screw rod (32), the reciprocating slider (33) being fixedly connected to the upper cover (12), a limiting rod (34) being fixedly connected between the two third connecting plates (30), the limiting rod (34) passing through the reciprocating slider (33), and the reciprocating slider (33) being able to drive the upper cover (12) to move in a horizontal direction.

10. A twin-screw extruder as claimed in claim 8, characterized in that: A scraping unit is arranged on the side of the scraping plate (10), and the scraping unit comprises a plurality of second scraping protrusions (38) symmetrically arranged on both sides of the scraping plate (10); a groove (39) adapted to the second scraping protrusion (38) is arranged on the scraping plate (10); a third guide rod (40) is fixedly connected in the groove (39); the third guide rod (40) is inserted in a movable groove (41) arranged on the second scraping protrusion (38); the second scraping protrusion (38) is connected to the groove (39) via a third spring (42) for providing elastic force; the third spring (42) is sleeved on the outer side of the third guide rod (40).

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