Reclaimed butyl rubber lamination device

Abstract

The utility model relates to the technical field of reclaimed rubber production, in particular to a butyl reclaimed rubber lamination device, aims to solve the technical problem of overcoming the defects in the lamination process in the prior art, and is mainly realized through the following technical scheme: the butyl reclaimed rubber lamination device comprises a base, the device further comprises a first lamination piece and a second lamination piece, a conveying piece is arranged between the first lamination piece and the second lamination piece, the first lamination piece comprises a first open mill and a first conveying belt, the second lamination piece comprises a second open mill and a second conveying belt, and the conveying piece comprises two conveying belts, a heat preservation cover and a material buffering piece. According to the film laminating device, in the production process, films are directly laminated, the films are guided in and pressed to ensure that the two laminated films can be well fused, and it is ensured that the edges of the films are flat in size through the edge cutting piece and the edge trimming piece.

Description

Technical Field

[0001] The utility model relates to the technical field of reclaimed rubber production, in particular to a butyl reclaimed rubber laminating device. Background Art

[0002] Rubber is the fourth strategic resource after industrial raw materials such as petroleum, iron ore and non-ferrous metals. In China, natural rubber and petroleum resources are seriously lacking. Therefore, China uses waste rubber to produce reclaimed rubber to partially replace virgin rubber, thus alleviating the shortage of rubber resources. Recycling reclaimed rubber has become an important means, and at the same time, reclaimed rubber has become the third largest rubber resource after natural rubber and synthetic rubber.

[0003] In the prior art, the laminating operation is mostly carried out on the cooled film. The film after water cooling and air cooling is conveyed by a conveying member and then automatically laminated. However, when the film is laminated after cooling, the overall product strength is poor and the elongation at break cannot meet the requirements. Although there are also devices that can laminate the film during the production process, there is a lack of a fixed-length cutting function during the intermediate lamination, and it is not easy to control the lamination thickness and specific position. In addition, the films cannot be well fused after lamination. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects in the prior art during the lamination process, so as to provide a butyl reclaimed rubber laminating device.

[0005] The above technical object of the utility model is achieved by the following technical solutions:

[0006] A butyl reclaimed rubber laminating device includes a base, and further includes a first laminating member and a second laminating member arranged on the base. The first laminating member and the second laminating member are arranged horizontally side by side. The first laminating member and the second laminating member are connected by a conveying member. The first laminating member includes a first mill and a first conveyor belt. The first conveyor belt is arranged at the outlet of the first mill. The second laminating member includes a second mill and a second conveyor belt. The second conveyor belt is arranged at the outlet of the second mill. The conveying member includes two horizontally side-by-side conveyor belts and a heat preservation cover. The heat preservation cover is arranged above the two conveyor belts. The conveying member further includes a slow-feeding member arranged between the two conveyor belts. A guiding member is further arranged at the conveyor belt near the second conveyor belt.

[0007] By adopting the above technical solutions, the first laminating member and the second laminating member are arranged to directly laminate the film during the production process of reclaimed rubber, reducing the possibility of strength decline caused by cooling lamination and effectively improving the product strength.

[0008] Further, both the first conveyor belt and the second conveyor belt are inclined. One end of the bottom of the first conveyor belt is close to the outlet of the first kneader, one end of the top of the first conveyor belt is close to the inlet of the conveyor belt, one end of the bottom of the second conveyor belt is close to the outlet of the second kneader, the outlet of the conveyor belt is arranged close to the middle of the second conveyor belt, and the height of the top of the first conveyor belt is lower than the height of the top of the second conveyor belt.

[0009] By adopting the above technical solution, the material discharged from the first kneader is sent to the middle of the second conveyor belt through the first conveyor belt and the conveyor belt to realize the lamination operation, and then enters the next process together after pressing.

[0010] Further, there is a gap in the middle of the two conveyor belts. The slow-feeding member is arranged between the two conveyor belts. The slow-feeding member includes a slow-feeding frame, a slow-feeding roller and two guide rollers. The slow-feeding frame is arranged between the two conveyor belts and both ends extend with mounting frames above the conveyor belts. The slow-feeding roller is vertically slidably arranged on the slow-feeding frame. The guide rollers are fixedly and rotatably installed on the mounting frames. The axes of the slow-feeding roller and the guide rollers are parallel and both are arranged along the width direction of the conveyor belt.

[0011] By adopting the above technical solution, two conveyor belts are arranged and the slow-feeding member is used to control the conveying speed of the film, ensuring smooth lamination of the film and reducing the situation of redundant lamination or lamination pulling.

[0012] Further, a trimming member is also arranged on the conveyor belt close to the first conveyor belt side. The trimming member includes two trimming knives, an adjustment frame and two adjustment blocks. The trimming knives are fixed at the bottom of the adjustment blocks. The adjustment frame is in a U shape with the opening downward and is arranged along the width direction of the conveyor belt and both ends are fixed on the side of the conveyor belt. The adjustment blocks are slidably arranged on the adjustment frame.

[0013] By adopting the above technical solution, the upper layer of the film is trimmed by the trimming member to remove the redundant edges on both sides before lamination, ensuring a flat edge. The adjustment blocks can adjust the position of the trimming knives to control the trimming size. In order to facilitate the subsequent pressing operation, the size of the upper layer of the film is slightly smaller than the size of the lower layer of the film.

[0014] Further, feeding members are arranged on both sides of the trimming member. The feeding members include guide plates and cutting-off members. The guide plates are inclined and extend to the inlet of the second kneader. The cutting-off members are installed at the inlet of the second kneader. The cutting-off members include a cutting-off drive and two relatively rotating cutting-off gears. The two cutting-off gears are meshed, and the cutting-off drive controls the movement of one of the cutting-off gears.

[0015] By adopting the above technical solution, the waste generated by trimming is sent into the second kneader through the feeding members for reprocessing and refining operation, reducing material waste.

[0016] Further, the guiding member includes a guiding roller and an inlet plate. The guiding roller is rotatably mounted below the outlet of the conveyor belt with its axis arranged along the width direction of the conveyor belt. The inlet plate is inclined and fixed on the side of the guiding roller close to the second conveyor belt. The height of the inlet plate on the side close to the guiding roller is higher than that on the side far from the guiding roller. A fitting plate extends at the bottom of the inlet plate, and the fitting plate is arranged parallel to the upper surface of the second conveyor belt.

[0017] By adopting the above technical solution, the guiding roller cooperates with the inlet plate to cover the upper layer of film on the surface of the lower layer of film, realizing the laminating operation of the two layers of film. The fitting plate fits the surface of the lower layer of film and partially presses and flattens it, facilitating the overlapping of the upper layer of film and the lower layer of film.

[0018] Further, a pressing member is also arranged in the middle of the second conveyor belt. The pressing member includes a pressing frame, two movable frames and a pressing roller. The pressing frame is in a U shape with an opening facing downwards, and both ends of the bottom are fixed on the second conveyor belt. The top of the movable frame is hinged on the pressing frame, the bottom of the movable frame is rotatably connected with the pressing roller, and both ends of the pressing roller are rotatably mounted on the two side movable frames.

[0019] By adopting the above technical solution, the laminated film is subjected to an extrusion and overlapping operation through the pressing member, reducing the gap between the two layers of film, ensuring that the two films are closely attached, and facilitating subsequent synchronous entry into the filtering process.

[0020] Further, an edge trimming member is also arranged on the second conveyor belt. The edge trimming member is arranged on the side of the pressing member far from the guiding member, and the edge trimming members are arranged oppositely on both sides in the width direction of the second conveyor belt. Each side of the edge trimming member includes an edge trimming strip and a plurality of elastic members. The edge trimming strip is arranged along the length direction of the second conveyor belt, and an arc-shaped guiding edge extends on the side close to the pressing member. The elastic member is a compression spring and is fixed on the side of the edge trimming strip far from the center of the second conveyor belt, and the other end of the elastic member is fixed on the side wall of the second conveyor belt.

[0021] By adopting the above technical solution, the pressed film is subjected to two-side shaping again through the edge trimming member, ensuring that the edges of the film entering the next process are neat and the sizes are unified.

[0022] In summary, the technical solution of the present utility model has the following advantages:

[0023] 1. The butyl recycled rubber laminating device provided by the present utility model, through the cooperation of the first laminating member and the second laminating member with the conveying member, is a device that directly laminates the film during the production process, reducing the film cooling process, ensuring the strength of the finished film, and meeting the elongation rate requirements.

[0024] 2. The butyl reclaimed rubber laminating device provided by the present utility model is provided with a pressing member, which presses and combines the films after overlapping to ensure good fusion between the two laminations, reduces the gap between the two films, and avoids subsequent cooling and separation.

[0025] 3. The butyl reclaimed rubber laminating device provided by the present utility model is provided with a trimming member to trim the upper film to be laminated, and a sizing member to size the laminated and pressed film, ensuring that the edge dimensions of the film are flat and facilitating the improvement of the quality of the subsequent finished film. Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of the overall structure of a butyl reclaimed rubber laminating device provided in an embodiment of the present utility model;

[0028] Figure 2 It is a schematic diagram of the structure of the trimming member provided in an embodiment of the present utility model;

[0029] Figure 3 It is a schematic diagram of the structure of the feeding member provided in an embodiment of the present utility model;

[0030] Figure 4 It is a schematic diagram of the structure of the buffer member provided in an embodiment of the present utility model;

[0031] Figure 5 It is a schematic diagram of the structure of the pressing member and the sizing member provided in an embodiment of the present utility model.

[0032] Description of the Reference Numerals:

[0033] 1. Base; 2. First lamination member; 21. First kneader; 22. First conveyor belt; 3. Second lamination member; 31. Second kneader; 32. Second conveyor belt; 4. Conveying member; 41. Conveyor belt; 42. Thermal insulation cover; 43. Buffer member; 431. Buffer rack; 4311. Mounting rack; 432. Buffer roller; 433. Guide roller; 5. Guiding member; 51. Guide roller; 52. Inlet plate; 521. Fitting plate; 6. Edge trimming member; 61. Edge trimming knife; 62. Adjusting rack; 63. Adjusting block; 7. Feeding member; 71. Guide plate; 72. Cutting member; 721. Cutting drive; 722. Cutting gear; 8. Pressing member; 81. Pressing rack; 82. Movable rack; 83. Pressing roller; 9. Edge finishing member; 91. Edge finishing strip; 911. Guiding edge; 92. Elastic member. Detailed implementation manner

[0034] The following further describes the present utility model in detail in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0035] A butyl recycled rubber laminating device, as Figure 1 shown, includes a base 1, a first lamination member 2 and a second lamination member 3. The first lamination member 2 and the second lamination member 3 are arranged on the base 1. The first lamination member 2 and the second lamination member 3 are arranged horizontally side by side. The first lamination member 2 and the second lamination member 3 are connected by a conveying member 4. The first lamination member 2 includes a first kneader 21 and a first conveyor belt 22. The first conveyor belt 22 is arranged at the outlet of the first kneader 21. The first conveyor belt 22 is inclined. One end of the bottom of the first conveyor belt 22 is close to the outlet of the first kneader 21, and one end of the top of the first conveyor belt 22 is close to the inlet of the conveyor belt 41. The second lamination member 3 includes a second kneader 31 and a second conveyor belt 32. The second conveyor belt 32 is inclined. The second conveyor belt 32 is arranged at the outlet of the second kneader 31. One end of the bottom of the second conveyor belt 32 is close to the outlet of the second kneader 31. The outlet of the conveyor belt 41 is arranged close to the middle of the second conveyor belt 32. The top height of the first conveyor belt 22 is lower than the top height of the second conveyor belt 32.

[0036] The conveying member 4 includes two conveyor belts 41 arranged horizontally side by side and a thermal insulation cover 42. The thermal insulation cover 42 is arranged above the two conveyor belts 41. The height of the thermal insulation cover 42 on the left is greater than the height of the thermal insulation cover 42 on the right. The conveying member 4 further includes a buffer member 43. The buffer member 43 is arranged between the two conveyor belts 41. A guiding member 5 is further arranged at the conveyor belt 41 close to the second conveyor belt 32. A pressing member 8 is further arranged in the middle of the second conveyor belt 32. An edge finishing member 9 is further arranged at the discharging end of the second conveyor belt 32.

[0037] The first laminated sheet 2 and the second laminated sheet 3 are set to perform the lamination operation on the film directly during the production process of the reclaimed rubber. The discharge of the first kneader 21 passes through the first conveyor belt 22 and is sent to the middle of the second conveyor belt 32 through the conveyor belt 41 to achieve the lamination operation, reducing the possibility of strength decline caused by cooling lamination and effectively improving the product strength.

[0038] As Figure 1 and Figure 4 shown, there is a gap in the middle of the two conveyor belts 41, and the buffer member 43 is arranged between the two conveyor belts 41. The buffer member 43 includes a buffer frame 431, a buffer roller 432 and two guide rollers 433. The buffer frame 431 is arranged between the two conveyor belts 41 and both ends extend with mounting frames 4311 above the conveyor belts 41. The buffer roller 432 is vertically slidably arranged on the buffer frame 431, and the guide rollers 433 are positioned and rotatably installed on the mounting frames 4311. The axes of the buffer roller 432 and the guide rollers 433 are parallel and are both arranged along the width direction of the conveyor belt 41. By setting the two conveyor belts 41 and controlling the film conveying speed through the buffer member 43, it is ensured that the films are smoothly attached during lamination, reducing the situation of redundant lamination or lamination pulling.

[0039] As Figure 1 and Figure 2 shown, a trimming member 6 is also arranged on the conveyor belt 41 near the first conveyor belt 22 side. The trimming members 6 are oppositely arranged on both sides in the width direction of the conveyor belt 41. The trimming member 6 includes two trimming knives 61, an adjustment frame 62 and two adjustment blocks 63. The adjustment frame 62 is in a U shape with an opening downward and both ends are fixed to the side of the conveyor belt 41. The adjustment frame 62 is arranged along the width direction of the conveyor belt 41. Each trimming knife 61 is fixed to the bottom of the corresponding adjustment block 63, and the adjustment block 63 is slidably arranged on the adjustment frame 62 along the length direction of the top of the adjustment frame 62. The upper layer of the film is trimmed by the trimming member 6 to remove the redundant sides on both sides before lamination to ensure smooth edges. The adjustment block 63 can adjust the position of the trimming knife 61 to control the trimming size. For the convenience of subsequent pressing operation, the size of the upper layer of the film is slightly smaller than that of the lower layer of the film.

[0040] As Figure 1 , Figure 2 and Figure 3 shown, feeding members 7 are arranged on both the front and back sides of the trimming member 6. The feeding member 7 includes a guide plate 71 and a cutting member 72. The guide plate 71 is inclined and extends to the entrance of the second kneader 31. The cutting members 72 are installed on both sides opposite to the entrance of the second kneader 31. The cutting member 72 includes a cutting drive 721 and two relatively rotating cutting gears 722. The two cutting gears 722 are meshed, and the cutting drive 721 controls the movement of one of the cutting gears 722. The waste generated by trimming is sent into the second kneader 31 through the feeding member 7 for refeeding and refining operation, reducing the material waste operation.

[0041] AsFigure 1 and Figure 5 As shown in Figure 5 , the guiding member 5 includes a guiding roller 51 and an introducing plate 52. The guiding roller 51 is positioned and rotatably installed below the right-side outlet of the conveyor belt 41, and its axis is arranged along the width direction of the conveyor belt 41. The introducing plate 52 is inclined and fixed on the side of the guiding roller 51 close to the second conveyor belt 32. The height of the side of the introducing plate 52 close to the guiding roller 51 is higher than the height of the side of the introducing plate 52 away from the guiding roller 51. A fitting plate 521 also extends at the bottom of the introducing plate 52. The fitting plate 521 is arranged parallel to the upper surface of the second conveyor belt 32, and the length of the fitting plate 521 is relatively short. The guiding roller 51 cooperates with the introducing plate 52 to cover the upper layer of film on the surface of the lower layer of film, realizing the laminating operation of the two layers of film. The fitting plate 521 fits the surface of the lower layer of film and partially presses and flattens it, facilitating the overlapping of the upper layer of film and the lower layer of film.

[0042] As Figure 1 and Figure 5 As shown in Figure 5 , a pressing member 8 is further provided in the middle of the second conveyor belt 32. The pressing member 8 includes a pressing frame 81, two movable frames 82, and a pressing roller 83. The pressing frame 81 is in a U shape with an opening facing downwards, and both ends of the bottom are fixed on the second conveyor belt 32. The top of each movable frame 82 is hinged on the pressing frame 81, and the bottom of the movable frame 82 is rotatably connected to the pressing roller 83. Both ends of the pressing roller 83 are positioned and rotatably installed on the two side movable frames 82. The laminated film is subjected to an extrusion and overlapping operation through the pressing member 8, reducing the gap between the two layers of film, ensuring that the two films are closely attached, and facilitating subsequent synchronous entry into the filtering process.

[0043] As Figure 1 and Figure 5 As shown in Figure 5 , a trimming member 9 is further provided on the second conveyor belt 32. The trimming member 9 is arranged on the side of the pressing member 8 away from the guiding member 5, and the trimming members 9 are oppositely arranged on both sides in the width direction of the second conveyor belt 32. The trimming member 9 includes a trimming strip 91 and a plurality of elastic members 92. The trimming strip 91 is arranged along the length direction of the second conveyor belt 32, and an arc-shaped guiding edge 911 extends on the side close to the pressing member 8. The elastic member 92 is a compression spring and is fixed on the side of the trimming strip 91 away from the center of the second conveyor belt 32, and the other end of the elastic member 92 is fixed on the side wall of the second conveyor belt 32. The pressed film passes through the trimming member 9 again for trimming both sides, ensuring that the edges of the film entering the next process are neat and the sizes are unified.

[0044] Working principle and usage method of the butyl reclaimed rubber laminating device: The upper layer of rubber sheet is produced by the discharge of the first mixing mill 21, and the upper layer of rubber sheet is conveyed to the conveyor belt 41 by the first conveyor belt 22. Before laminating, the upper layer of rubber sheet first cuts off the excess edges on both sides through the edge trimming part 6. The waste generated by edge trimming is sent into the second mixing mill 31 through the feeding part 7 for regrinding operation. The edge-trimmed upper layer of rubber sheet is sent into the second conveyor belt 32 and cooperates with the guiding part 5 and the pressing part 8 to achieve the laminating operation in the middle. The guiding roller 51 cooperates with the guiding plate 52 to cover the upper layer of rubber sheet on the surface of the lower layer of rubber sheet to achieve the laminating operation of two layers of rubber sheets. The fitting plate 521 fits the surface of the lower layer of rubber sheet and partially presses and flattens it. Subsequently, after being pressed by the pressing roller 83, they enter the next process together.

[0045] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. And the changes and alterations made by those skilled in the art that do not depart from the spirit and scope of the present invention shall all be within the protection scope of the appended claims of the present invention.

Claims

1. A butyl reclaimed rubber lamination device, comprising a base (1), characterized in that: The invention also comprises a first laminated member (2) and a second laminated member (3) arranged on the base (1), wherein the first laminated member (2) and the second laminated member (3) are arranged in parallel in a transverse manner, and the first laminated member (2) and the second laminated member (3) are connected via a conveying member (4), the first laminated member (2) comprises a first open mill (21) and a first conveyor belt (22), and the first conveyor belt (22) is arranged at the outlet of the first open mill (21), and the second laminated member (3) comprises a second open mill (31) and a first conveyor belt (22). A second conveyor belt (32), wherein the second conveyor belt (32) is arranged at the outlet of the second mixing mill (31), wherein the conveying member (4) comprises two conveyor belts (41) and a heat-insulating cover (42) which are arranged in parallel in a transverse direction, wherein the heat-insulating cover (42) is arranged above the two conveyor belts (41), wherein the conveying member (4) further comprises a material buffer (43), wherein the material buffer (43) is arranged between the two conveyor belts (41), and a guide member (5) is also arranged on the conveyor belt (41) near the second conveyor belt (32).

2. A butyl reclaimed rubber lamination device according to claim 1, characterized in that: The first conveyor belt (22) and the second conveyor belt (32) are both arranged at an inclination, with the bottom end of the first conveyor belt (22) close to the outlet of the first mixing mill (21), the top end of the first conveyor belt (22) close to the inlet of the conveyor belt (41), the bottom end of the second conveyor belt (32) close to the outlet of the second mixing mill (31), the outlet of the conveyor belt (41) close to the middle of the second conveyor belt (32), and the top height of the first conveyor belt (22) lower than the top height of the second conveyor belt (32).

3. A butyl reclaimed rubber lamination device according to claim 2, characterized in that: A gap is left in the middle of the two conveyor belts (41), and the material buffer (43) is arranged between the two conveyor belts (41). The material buffer (43) comprises a material buffer frame (431), a material buffer roller (432) and two material guide rollers (433). The material buffer frame (431) is arranged between the two conveyor belts (41) and has mounting frames (4311) extending from both ends to above the conveyor belts (41). The material buffer roller (432) is vertically slidably arranged on the material buffer frame (431), and both ends of the material guide roller (433) are positioned and rotatably installed on the mounting frame (4311). The material buffer roller (432) and the material guide roller (433) are arranged parallel to the axis of the material buffer roller (432) and the guide roller (433) and are both arranged along the width direction of the conveyor belt (41).

4. A butyl reclaimed rubber lamination device according to claim 3, characterized in that: A trimming piece (6) is also provided on the conveyor belt (41) on one side close to the first conveyor belt (22), and the trimming piece (6) comprises two trimming knives (61), an adjustment frame (62) and two adjustment blocks (63). The trimming knives (61) are fixed to the bottom of the adjustment blocks (63) respectively, the adjustment frame (62) is in a U-shape with an opening downward and two ends are fixed to opposite sides of the conveyor belt (41), the adjustment frame (62) is arranged along the width direction of the conveyor belt (41), and the adjustment block (63) is slidably arranged on the adjustment frame (62) along the length direction of the top of the adjustment frame (62).

5. A butyl reclaimed rubber lamination device according to claim 4, characterized in that: Feeding pieces (7) are correspondingly arranged on both sides of the trimming piece (6), and the feeding piece (7) comprises a guide plate (71) and a cutting piece (72), the guide plate (71) is inclined and extends to the entrance of the second open mill (31), the cutting piece (72) is installed at the entrance of the second open mill (31), and the cutting piece (72) comprises a cutting drive (721) and two relatively rotating cutting gears (722), the two cutting gears (722) are meshed, and the cutting drive (721) controls the movement of one of the cutting gears (722).

6. The butyl reclaimed rubber lamination device according to claim 1, characterized in that: The guide member (5) comprises a guide roller (51) and an introduction plate (52); the guide roller (51) is rotatably mounted below the outlet of the conveyor belt (41) and its axis is arranged along the width direction of the conveyor belt (41); the introduction plate (52) is inclined and fixed on the side of the guide roller (51) close to the second conveyor belt (32); the height of the side of the introduction plate (52) close to the guide roller (51) is higher than the height of the side of the introduction plate (52) away from the guide roller (51); a bonding plate (521) is further extended from the bottom of the introduction plate (52); the bonding plate (521) is arranged parallel to the upper surface of the second conveyor belt (32).

7. A butyl reclaimed rubber lamination device according to claim 6, characterized in that: A pressing part (8) is also provided in the middle of the second conveyor belt (32), and the pressing part (8) comprises a pressing frame (81), two movable frames (82) and a pressing roller (83). The pressing frame (81) is in a U-shape with its opening facing downwards and its two ends are fixed on the second conveyor belt (32). The top of the movable frame (82) is hingedly arranged on the pressing frame (81), and the bottom of the movable frame (82) is rotatably connected to the pressing roller (83). The two ends of the pressing roller (83) are positioned and rotatably installed on the movable frames (82) on both sides.

8. A butyl reclaimed rubber lamination device according to claim 7, characterized in that: The second conveyor belt (32) is also provided with an edge straightening piece (9), and the edge straightening piece (9) is arranged on the side of the pressing piece (8) away from the guide piece (5). The edge straightening piece (9) is relatively arranged on both sides of the width direction of the second conveyor belt (32), and each side of the edge straightening piece (9) includes an edge straightening strip (91) and a plurality of elastic pieces (92). The edge straightening strip (91) is arranged along the length direction of the second conveyor belt (32) and has an arc-shaped guide edge (911) extending on the side close to the pressing piece (8). The elastic piece (92) is a pressure spring and is fixed on the side of the edge straightening strip (91) away from the center of the second conveyor belt (32). The other end of the elastic piece (92) is fixed on the side wall of the second conveyor belt (32).

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