Pressing and compounding device for battery pole piece

Abstract

The utility model relates to the technical field of electrode plate compounding, and provides a battery electrode plate pressing and compounding device which comprises a rack, the two extrusion rollers are both arranged on the rack, and an extrusion gap is formed between the two extrusion rollers and used for extruding formed materials; the material collecting roller is rotationally arranged on the rack and located behind the extrusion roller in the material conveying direction, and the material collecting roller is used for winding the formed materials; and the feeding box is arranged on the extrusion roller, and the discharging end of the feeding box communicates with the extrusion gap. By means of the technical scheme, the problems that in the related technology, in the powder adding process, manual continuous adding is needed, frequent and small-amount adding is needed, and the workload of operators is increased are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrode sheet composite, and in particular to a battery electrode sheet pressing and composite device. Background Art

[0002] During the manufacturing process of lithium batteries, electrode materials need to be pressed and compounded. Usually, one or more rollers or rollers are used to evenly apply a mixture of positive and negative electrode materials, conductive agents, binders, etc. on the current collector (usually aluminum foil or copper foil) to form an electrode sheet with a certain thickness and shape. This process requires precise control of pressure, speed and temperature to ensure the quality and consistency of the electrode sheet. Before the composite electrode sheet, the diaphragm needs to be pressed, and then squeezed onto the current collector after the diaphragm is formed. The diaphragm extrusion molding process requires powder molding, and the powder needs to be extruded during the powder molding process. Powder is added to the roller, and the process of adding powder requires continuous manual addition, and frequent small amounts of addition are required, which increases the workload of the operator. Utility Model Content

[0003] The utility model provides a battery pole piece pressing and compounding device, which solves the problem in the related art that the process of adding powder requires manual continuous addition and frequent addition in small amounts, which increases the workload of operators.

[0004] The technical solution of the utility model is as follows:

[0005] Battery pole piece pressing and compounding device, including:

[0006] frame;

[0007] There are two extrusion rollers, both of which are arranged on the frame, and the two extrusion rollers form an extrusion gap, and the extrusion gap is used for extruding and molding materials;

[0008] A material collecting roller is rotatably arranged on the frame and is located behind the squeezing roller along the material conveying direction, and the material collecting roller is used to wind the formed material;

[0009] A feed box is arranged on the extrusion roller, and a discharge end of the feed box is communicated with the extrusion gap.

[0010] As a further technical solution, it also includes:

[0011] There are two scrapers, which are respectively arranged on both sides of the two squeezing rollers and respectively abut against the two squeezing rollers to collect materials attached to the squeezing rollers;

[0012] A collecting box is arranged under the action end of the scraper, and the collecting box is used to collect the materials scraped by the scraper.

[0013] As a further technical solution, it also includes:

[0014] There are a plurality of transmission rollers, each of which is rotatably arranged on the frame, and the transmission rollers are used to transmit the formed material;

[0015] A trimming assembly is arranged on the frame, the trimming assembly is located between the extrusion roller and the material collecting roller, and the trimming assembly is located behind the driving roller along the material conveying direction, and the trimming assembly is used to trim the extruded material.

[0016] As a further technical solution, the trimming assembly includes:

[0017] A trimming roller is rotatably arranged on the frame, the trimming roller has a plurality of avoidance grooves, and the plurality of avoidance grooves are arranged at intervals on the trimming roller;

[0018] A knife roller is rotatably arranged on the frame, and a material passing gap is formed between the knife roller and the trimming roller;

[0019] The trimming knives are provided with two, and the positions of the two trimming knives are adjustable and arranged at the two ends of the knife roller. The knife roller is used to drive the trimming knives to rotate. The trimming knives have cutting ends, and the avoidance grooves are used to avoid the cutting ends.

[0020] As a further technical solution, the trimming assembly includes:

[0021] A first gear, disposed on the knife roller;

[0022] A second gear, disposed on the trimming roller, the first gear and the second gear are meshed and connected, and the second gear is used to drive the first gear to rotate;

[0023] The first driving unit is arranged on the second gear, and the first driving unit is used for driving the second gear to rotate.

[0024] As a further technical solution, the trimming assembly further includes:

[0025] A mounting seat, arranged on the frame, and having a first slide groove;

[0026] A slider, slidably disposed in the first slide groove, and the first gear is slidably disposed on the frame through the slider;

[0027] An elastic member, one end of which is arranged on the frame and the other end of which is arranged on the slider, is used to provide a force for the slider to approach the second gear.

[0028] As a further technical solution, the trimming assembly further includes:

[0029] The adjusting member is rotatably arranged on the frame, one end of the elastic member is arranged on the slider, and the other end is arranged on the frame through the adjusting member, and the adjusting member is used to adjust the elastic force of the elastic member after being rotated.

[0030] As a further technical solution, it also includes:

[0031] The deviation adjustment component is arranged on the frame, and the deviation adjustment component comprises:

[0032] A deviation adjusting rod, arranged on the frame, and used for conveying formed materials;

[0033] The deviation adjusting member is slidably arranged on the deviation adjusting rod, and after the deviation adjusting member slides, it is used to adjust the position of the molding material.

[0034] As a further technical solution, the material collecting rollers are provided with two, both of which have positive thread, and the frame is provided with a second slide groove, and further includes:

[0035] A rotating seat, the material collecting roller is rotatably arranged on the frame through the rotating seat, and the material collecting roller is arranged on the rotating seat through a positive thread;

[0036] A reinstallation assembly is arranged on the frame, and the reinstallation assembly includes:

[0037] A sliding plate, the sliding plate having a first protrusion, wherein the first protrusion is slidably disposed in the second sliding groove;

[0038] A telescopic rod is rotatably arranged on the sliding plate, the telescopic end of the telescopic rod has an external thread, the material collecting roller has an internal thread hole, the internal thread hole is a reverse thread, and the telescopic rod has an external thread;

[0039] A telescopic pin is arranged on the telescopic rod, and is used to limit or not limit the relative rotation of the telescopic rod and the material collecting roller. After the telescopic rod is extended and retracted, it is used to move closer to or away from the material collecting roller. After the telescopic rod is rotated, it is used to make the external thread and the internal thread hole match or not match, and to connect or disconnect the material collecting roller and the frame.

[0040] The working principle and beneficial effects of the utility model are:

[0041] In the utility model, since the composite electrode sheet needs to be pressed before the membrane is formed, and then squeezed onto the current collector after the membrane is formed, the membrane extrusion molding process needs to be formed by powder, and the powder needs to be extruded during the powder molding process, and the powder needs to be added to the pressing roller. The process of adding powder requires manual continuous addition, and frequent small amounts need to be added, which increases the workload of the operators. The present solution is provided with an extrusion roller, which is arranged on a frame, and the material is added from the extrusion gap of the extrusion roller. After adding, the material is extruded and formed under the action of the extrusion roller, and the formed material is wound around the material collecting roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Figure 1 This is a schematic diagram of the structure of the utility model from the first perspective;

[0044] Figure 2 This is a schematic diagram of the structure of the utility model from a second viewing angle;

[0045] Figure 3 This is a schematic diagram of the structure of the utility model from a third viewing angle;

[0046] Figure 4 for Figure 3 A local enlarged structural schematic diagram;

[0047] Figure 5 for Figure 2 A schematic diagram of the local enlarged structure at B;

[0048] Figure 6 for Figure 5 A schematic diagram of the local enlarged structure at C;

[0049] Figure 7 for Figure 1 A schematic diagram of the local enlarged structure at D;

[0050] Figure 8 for Figure 1 A schematic diagram of the local enlarged structure at E;

[0051] Fig. 9 for Figure 2 A schematic diagram of the local enlarged structure at F;

[0052] In the figure: 1. frame, 2. extrusion roller, 3. extrusion gap, 4. material collecting roller, 5. feed box, 6. scraper, 7. collecting box, 8. transmission roller, 9. trimming assembly, 10. trimming roller, 11. avoidance groove, 12. knife roller, 13. material gap, 14. trimming knife, 15. cutting end, 16. first gear, 17. second gear, 18. mounting seat, 19. first slide groove, 20. slider, 21. first drive unit, 22. elastic member, 23. deviation adjustment assembly, 24. deviation adjustment rod, 25. deviation adjustment member, 26. second slide groove, 27. reinstallation assembly, 28. sliding plate, 29. telescopic rod, 30. external thread, 31. internal thread hole, 32. adjusting member, 33. rotating seat, 34. telescopic pin. DETAILED DESCRIPTION

[0053] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0054] Example

[0055] like Figure 1 to Figure 9 As shown, this embodiment proposes

[0056] Battery pole piece pressing and compounding device, including:

[0057] Rack 1;

[0058] There are two extrusion rollers 2, both of which are arranged on the frame 1, and the two extrusion rollers 2 form an extrusion gap 3, and the extrusion gap 3 is used for extruding and molding materials;

[0059] The material collecting roller 4 is rotatably arranged on the frame 1 and is located behind the squeezing roller 2 along the material conveying direction. The material collecting roller 4 is used to wind the formed material;

[0060] The feed box 5 is arranged on the extrusion roller 2 , and the discharge end of the feed box 5 is connected to the extrusion gap 3 .

[0061] In this embodiment, since the composite electrode sheet needs to be pressed before the membrane is formed and then extruded onto the current collector, the membrane extrusion molding process needs to be formed by powder, and the powder needs to be extruded during the powder molding process, and the powder is added to the pressing roller. The process of adding powder requires manual continuous addition, and frequent small amounts of addition are required, which increases the workload of the operators. This solution is provided with an extrusion roller 2, which is set on the frame 1. The material is added from the extrusion gap 3 of the extrusion roller 2. After adding, it is extruded and formed under the action of the extrusion roller 2, and the formed material is wound around the material collecting roller 4.

[0062] Furthermore, it also includes:

[0063] There are two scrapers 6, which are respectively arranged on both sides of the two squeezing rollers 2 and respectively abut against the two squeezing rollers 2 to collect the materials attached to the squeezing rollers 2;

[0064] The collecting box 7 is arranged under the action end of the scraper 6 and is used for collecting the materials scraped by the scraper 6 .

[0065] In this embodiment, a scraper 6 is provided in this scheme, and the scraper 6 is arranged on both sides of the two squeezing rollers 2. As the squeezing rollers 2 rotate, the scraper 6 will scrape off the powdered material attached to the squeezing rollers 2. This scheme is also provided with a collecting box 7, and the collecting box 7 is used to collect and recycle the material scraped by the scraper 6.

[0066] Furthermore, it also includes:

[0067] There are a plurality of transmission rollers 8, and the plurality of transmission rollers 8 are rotatably arranged on the frame 1, and the transmission rollers 8 are used to transmit the formed materials;

[0068] The trimming assembly 9 is arranged on the frame 1. The trimming assembly 9 is located between the extrusion roller 2 and the material collecting roller 4. The trimming assembly 9 is located behind the driving roller 8 along the material conveying direction. The trimming assembly 9 is used to trim the extruded material.

[0069] In this embodiment, the scheme conveys the formed material to the trimming assembly 9 through the transmission roller 8. The trimming assembly 9 is located behind the transmission roller 8. The trimming assembly 9 is used to trim both sides of the extruded diaphragm to increase the neatness of the diaphragm after extrusion.

[0070] Further, the trimming assembly 9 comprises:

[0071] A trimming roller 10 is rotatably arranged on the frame 1, and the trimming roller 10 has a plurality of avoidance grooves 11, and the plurality of avoidance grooves 11 are arranged on the trimming roller 10 at intervals;

[0072] The knife roller 12 is rotatably arranged on the frame 1, and the knife roller 12 and the trimming roller 10 form a material passing gap 13;

[0073] There are two trimming knives 14 , which are adjustable in position at both ends of the knife roller 12 . The knife roller 12 is used to drive the trimming knives 14 to rotate. The trimming knives 14 have cutting ends 15 , and the avoidance groove 11 is used to avoid the cutting ends 15 .

[0074] In this embodiment, a trimming roller 10 and a knife roller 12 are provided in this scheme. The trimming roller 10 is used to convey the film, the knife roller 12 is used to install the knife, and the trimming knife 14 is arranged on the knife roller 12. The knife roller 12 and the trimming roller 10 form a feed gap 13, and the film passes through the feed gap 13. The trimming knife 14 trims the film in the feed gap 13 after the knife roller 12 rotates.

[0075] Further, the trimming assembly 9 comprises:

[0076] A first gear 16, disposed on the knife roller 12;

[0077] The second gear 17 is disposed on the trimming roller 10, and the first gear 16 and the second gear 17 are meshed and connected, and the second gear 17 is used to drive the first gear 16 to rotate;

[0078] The first driving unit 21 is disposed on the second gear 17 , and is used to drive the second gear 17 to rotate.

[0079] In this embodiment, the scheme is provided with a first gear 16 and a second gear 17, the first gear 16 and the second gear 17 are meshed with each other, the first gear 16 is arranged on the knife roller 12, and the second gear 17 is arranged on the trimming roller 10. After the first driving unit 21 drives the second gear 17 to rotate, the second gear 17 drives the first gear 16 to rotate, and the first gear 16 and the second gear 17 respectively drive the knife roller 12 and the trimming roller 10 to rotate, thereby completing the transportation and cutting of the film.

[0080] Further, the trimming assembly 9 also includes:

[0081] A mounting seat 18, disposed on the frame 1, and having a first slide groove 19;

[0082] The slider 20 is slidably disposed in the first slide groove 19, and the first gear 16 is slidably disposed on the frame 1 through the slider 20;

[0083] The elastic member 22 has one end disposed on the frame 1 and the other end disposed on the slider 20 , and is used to provide a force for the slider 20 to approach the second gear 17 .

[0084] In this embodiment, the design of the mounting seat 18 and the first slide groove 19 enables the first gear 16 to be slid and adjusted on the frame 1 through the slider 20, thereby increasing the flexibility and adaptability of the device. The design of the elastic member 22 can provide a force for the slider 20 to approach the second gear 17, so that the first gear 16 and the second gear 17 can be well meshed during the operation of the device, thereby improving the transmission efficiency and also helping to reduce equipment failures caused by gear disengagement. This structural design simplifies the assembly and maintenance process of the device, because the slider 20 and the first gear 16 can be installed and disassembled by sliding without the need for complex alignment operations. At the same time, the presence of the elastic member 22 also enables the pressure between the gears to be automatically adjusted during the operation of the device, thereby reducing the need for manual intervention. Such a design also improves the working stability of the device. Since the elastic member 22 can continuously provide a force to make the slider 20 approach the second gear 17, even if the device is subjected to vibration or other external interference, the gears can be kept in a good meshing state, thereby ensuring the normal operation of the device.

[0085] Further, the trimming assembly 9 also includes:

[0086] The adjusting member 32 is rotatably arranged on the frame 1 . One end of the elastic member 22 is arranged on the slider 20 , and the other end is arranged on the frame 1 through the adjusting member 32 . The adjusting member 32 is used to adjust the elastic force of the elastic member 22 after being rotated.

[0087] In this embodiment, the design of the adjusting member 32 allows the elastic force of the elastic member 22 to be easily adjusted, so that the pressure between the first gear 16 and the second gear 17 can be adjusted according to actual needs to achieve the best working state. This has a positive effect on improving the working efficiency of the equipment and extending its service life. The design of the rotating adjusting member 32 makes the operation easier and faster. The elastic force of the elastic member 22 can be changed by rotating the adjusting member 32 without disassembling the equipment or replacing parts, which greatly improves the ease of use and maintenance of the equipment. The function of adjustable elastic force of the elastic member 22 enhances the adaptability of the equipment, enabling it to better cope with processing objects of different materials, thicknesses or shapes, thereby improving the working range and application field of the equipment.

[0088] Furthermore, it also includes:

[0089] The deviation adjustment component 23 is arranged on the frame 1, and the deviation adjustment component 23 includes:

[0090] The deviation adjusting rod 24 is arranged on the frame 1, and the deviation adjusting rod 24 is used to convey the formed material;

[0091] The deviation adjusting member 25 is slidably disposed on the deviation adjusting rod 24 . After the deviation adjusting member 25 slides, it is used to adjust the position of the molding material.

[0092] In this embodiment, the setting of the deviation adjustment component 23 can effectively adjust the position of the molding material during the conveying process, ensuring that it can accurately enter the next process or meet specific processing requirements. This has a positive significance for improving overall production efficiency and product quality. The design of the deviation adjustment rod 24 allows the material to be stably conveyed thereon, and the deviation adjustment member 25 moves on the deviation adjustment rod 24 by sliding, and the position of the material can be flexibly adjusted according to actual needs. This not only improves the adaptability of the equipment, but also reduces the difficulty of operation.

[0093] Further, there are two material collecting rollers 4, both of which have positive thread, and the frame 1 has a second slide groove 26, and further includes:

[0094] A rotating seat 33, the material collecting roller 4 is rotatably arranged on the frame 1 through the rotating seat 33, and the material collecting roller 4 is arranged on the rotating seat 33 through a positive screw thread;

[0095] The reinstallation assembly 27 is arranged on the frame 1, and the reinstallation assembly 27 includes:

[0096] A sliding plate 28, the sliding plate 28 having a first protrusion, the first protrusion being slidably disposed in the second sliding groove 26;

[0097] The telescopic rod 29 is rotatably arranged on the sliding plate 28, the telescopic end of the telescopic rod 29 has an external thread 30, the material collecting roller 4 has an internal thread hole 31, the internal thread hole 31 is a reverse thread, and the telescopic rod 29 has an external thread 30;

[0098] The telescopic pin 34 is arranged on the telescopic rod 29. The telescopic pin 34 is used to limit or not limit the relative rotation of the telescopic rod 29 and the material collecting roller 4. After the telescopic rod 29 is extended and retracted, it is used to move closer to or away from the material collecting roller 4. After the telescopic rod 29 rotates, it is used to make the external thread 30 and the internal thread hole 31 match or not match, and to connect or disconnect the material collecting roller 4 and the frame 1.

[0099] In this embodiment, the design of the rotating seat 33 enables the material collecting roller 4 to be easily rotated and adjusted in position, which is beneficial to the overall layout and space utilization of the equipment. At the same time, the material collecting roller 4 is arranged on the rotating seat 33 through the positive thread, which can be quickly disassembled and assembled, thereby improving the maintenance convenience of the equipment. The existence of the reinstallation component 27, especially the design of the sliding plate 28 and the telescopic rod 29, enables the material collecting roller 4 to be easily removed from the rotating seat 33 when it needs to be replaced or maintained. This not only simplifies the operation process and reduces the labor intensity, but also avoids the equipment from being shut down for a long time and affecting the production efficiency. The design of the telescopic pin 34 enables the telescopic rod 29 to rotate freely relative to the material collecting roller 4 within a certain range, and when it needs to be fixed, the relative rotation can be limited by the telescopic pin 34, ensuring the installation accuracy and stability. With the design of the reverse thread, the telescopic end of the telescopic rod 29 can be easily inserted into the internal thread hole 31 of the material collecting roller 4, thereby achieving the tightening and positioning of the material collecting roller 4, ensuring that it will not loosen or fall off during the working process. After the telescopic rod 29 is extended, it can be moved closer to or farther from the material collecting roller 4 to adapt to material collecting rollers 4 of different sizes and specifications, thereby enhancing the adaptability and expandability of the device. The two material collecting rollers 4 can be quickly switched by rotating the telescopic rod 29 and extending and retracting the telescopic pin 34 and the telescopic rod 29, thereby facilitating secondary extrusion, further increasing the precision of the extruded diaphragm, and increasing the efficiency of switching the material collecting roller 4.

[0100] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Battery pole piece pressing and compounding device, characterized in that: include: Rack(1); There are two extrusion rollers (2), both of which are arranged on the frame (1), and the two extrusion rollers (2) form an extrusion gap (3), and the extrusion gap (3) is used for extruding and molding materials; a material collecting roller (4) rotatably arranged on the frame (1) and located behind the squeezing roller (2) along the material conveying direction, the material collecting roller (4) being used to wind the formed material; A feed box (5) is arranged on the extrusion roller (2), and a discharge end of the feed box (5) is connected to the extrusion gap (3).

2. The battery pole piece pressing and compounding device according to claim 1, characterized in that: Also includes: There are two scrapers (6), the two scrapers (6) are respectively arranged on both sides of the two squeezing rollers (2), and respectively abut against the two squeezing rollers (2), and are used to collect materials attached to the squeezing rollers (2); A collecting box (7) is arranged below the action end of the scraper (6), and the collecting box (7) is used to collect materials scraped by the scraper (6).

3. The battery pole piece pressing and compounding device according to claim 1, characterized in that: Also includes: There are a plurality of transmission rollers (8), each of which is rotatably arranged on the frame (1), and the transmission rollers (8) are used to transmit the formed material; A trimming assembly (9) is arranged on the frame (1), the trimming assembly (9) is located between the extrusion roller (2) and the material collecting roller (4), and the trimming assembly (9) is located behind the driving roller (8) along the material conveying direction, and the trimming assembly (9) is used to trim the extruded material.

4. The battery pole piece pressing and compounding device according to claim 3, characterized in that: The trimming assembly (9) comprises: A trimming roller (10) is rotatably arranged on the frame (1), the trimming roller (10) having a plurality of avoidance grooves (11), and the plurality of avoidance grooves (11) are arranged at intervals on the trimming roller (10); A knife roller (12) is rotatably disposed on the frame (1), wherein the knife roller (12) and the trimming roller (10) form a material passing gap (13); The trimming knives (14) are provided with two trimming knives (14), the positions of which are adjustable at the two ends of the knife roller (12), the knife roller (12) being used to drive the trimming knives (14) to rotate, the trimming knives (14) having cutting ends (15), and the avoidance grooves (11) being used to avoid the cutting ends (15).

5. The battery pole piece pressing and compounding device according to claim 4, characterized in that: The trimming assembly (9) comprises: A first gear (16) is arranged on the knife roller (12); a second gear (17) disposed on the trimming roller (10), the first gear (16) and the second gear (17) being meshed and connected, the second gear (17) being used to drive the first gear (16) to rotate; A first driving unit (21) is arranged on the second gear (17), and the first driving unit (21) is used to drive the second gear (17) to rotate.

6. The battery pole piece pressing and compounding device according to claim 5, characterized in that: The trimming assembly (9) further comprises: A mounting seat (18) disposed on the frame (1), wherein the mounting seat (18) has a first sliding groove (19); a slider (20) slidably disposed in the first slide groove (19), and the first gear (16) is slidably disposed on the frame (1) via the slider (20); An elastic member (22) has one end disposed on the frame (1) and the other end disposed on the slider (20), and is used to provide a force for the slider (20) to approach the second gear (17).

7. The battery pole piece pressing and compounding device according to claim 6, characterized in that: The trimming assembly (9) further comprises: An adjusting member (32) is rotatably arranged on the frame (1); one end of the elastic member (22) is arranged on the slider (20), and the other end is arranged on the frame (1) through the adjusting member (32); the adjusting member (32) is used to adjust the elastic force of the elastic member (22) after rotation.

8. The battery pole piece pressing and compounding device according to claim 1, characterized in that: Also includes: The deviation adjustment component (23) is arranged on the frame (1), and the deviation adjustment component (23) comprises: A deviation adjustment rod (24) is arranged on the frame (1), and the deviation adjustment rod (24) is used to convey the formed material; The deviation adjusting member (25) is slidably arranged on the deviation adjusting rod (24); after the deviation adjusting member (25) slides, it is used to adjust the position of the molding material.

9. The battery pole piece pressing and compounding device according to claim 1, characterized in that: The material collecting rollers (4) are provided with two, and both of the material collecting rollers (4) have a positive thread. The frame (1) is provided with a second slide groove (26), and further comprises: A rotating seat (33), wherein the material collecting roller (4) is rotatably arranged on the frame (1) via the rotating seat (33), and the material collecting roller (4) is arranged on the rotating seat (33) via a positive-screw thread; A reinstallation assembly (27) is arranged on the frame (1), and the reinstallation assembly (27) comprises: a sliding plate (28), the sliding plate (28) having a first protrusion, the first protrusion being slidably disposed in the second sliding groove (26); A telescopic rod (29) is rotatably disposed on the sliding plate (28), the telescopic end of the telescopic rod (29) has an external thread (30), the material collecting roller (4) has an internal thread hole (31), the internal thread hole (31) is a reverse thread, and the telescopic rod (29) has an external thread (30); A telescopic pin (34) is arranged on the telescopic rod (29). The telescopic pin (34) is used to limit or not limit the relative rotation of the telescopic rod (29) and the material collecting roller (4). After the telescopic rod (29) is extended, it is used to move closer to or farther away from the material collecting roller (4). After the telescopic rod (29) is rotated, it is used to make the external thread (30) and the internal thread hole (31) match or not match, and to make the material collecting roller (4) and the frame (1) connected or not connected.

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