Corrugated carton edge cutting cutter

Abstract

The utility model belongs to the technical field of corrugated board cutting, and particularly relates to a corrugated carton edge cutter. The technical problem that when edges of corrugated boards are cut, the corrugated boards are inconvenient to clamp, and feeding and discharging are inconvenient and rapid is solved. According to the technical scheme, the edge cutting cutter for the corrugated carton comprises a workbench assembly; the device further comprises a cutting assembly, a clamping assembly, a supporting assembly, a material conveying assembly and an adsorption assembly. The first electric cylinder is started, the output shaft of the first electric cylinder drives the clamping plate to extend downwards, a paperboard at the upper end of a rubber pad is clamped, meanwhile, a component on the U-shaped fixing block moves along with the first fixing block, the vacuum suction cup moves downwards at the same time, and therefore the center of the paperboard is sucked; and the clamping plates clamp the left end and the right end of the paperboard to form tensioning force on the paperboard in three directions, so that the problem that the paperboard is inconvenient to clamp is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of corrugated cardboard cutting, in particular to a corrugated paper box edge trimming cutter. Background Art

[0002] Corrugated boxes are boxes made of corrugated cardboard, used for packaging and transporting various items. They use the special corrugated structure of corrugated cardboard to provide strength and cushioning effect to protect items from damage. Corrugated boxes are usually made by cutting and folding corrugated cardboard. In the existing technology, corrugated paper needs to be trimmed during the processing process. The existing corrugated paper trimming device has a single cutting method, and it is inconvenient to clamp the cardboard during cutting, and it is not convenient to quickly load and unload the cardboard. Utility Model Content

[0003] In order to overcome the problem of inconvenience in clamping the cardboard and inconvenience in quickly loading and unloading the material on the cutting board during the trimming work of the corrugated cardboard.

[0004] The technical solution of the utility model is: a corrugated cardboard box trimming cutter, including a workbench assembly; also including a cutting assembly, a clamping assembly, a supporting assembly, a material transfer assembly and an adsorption assembly; the workbench assembly is provided with a cutting assembly for cutting; the workbench assembly is provided with a clamping assembly for sliding clamping; the clamping assembly is provided with a supporting assembly for supporting; the supporting assembly is provided with a material transfer assembly for feeding; and the clamping assembly is provided with an adsorption assembly for adsorbing cardboard.

[0005] Preferably, a corrugated cardboard is placed on the workbench assembly, the cardboard is displaced by the rollers on the workbench assembly, the cardboard is clamped by the clamping assembly, the adsorption assembly on the clamping assembly adsorbs the cardboard, and the cutting assembly is opened by moving the clamping assembly to cut and trim the cardboard. When the cutting is completed, the clamping assembly and the adsorption assembly release the clamping and adsorption of the cardboard, the clamping assembly is moved so that the material transfer assembly is located above the cardboard, the material transfer assembly is opened to frictionally displace the cardboard, and then it is returned to its position for the next set of work, thereby solving the problems of inconvenience in clamping the cardboard and inconvenience in quickly loading and unloading the cardboard.

[0006] Preferably, the workbench assembly includes a table top, a first trough body, a slide rail, a first ear plate, a first roller, a first motor, a second trough body and a second ear plate; a symmetrical first trough body is opened at the upper end of the table top; the slide rail is fixed to the upper end of the first trough body; a symmetrical first ear plate is fixed to the front end of the table top; the first roller is rotatably installed on the end of the two first ear plates close to each other; the outer wall of the right-end first ear plate is fixed to the first motor; the output shaft of the first motor passes through the first ear plate and is fixed to the right-end outer wall of the first roller; a symmetrical second trough body is opened through the upper end of the table top; a symmetrical second ear plate is fixed to the lower end of the table top, and by turning on the first motor, the output shaft of the first motor drives the first roller to rotate. When the cardboard is placed above the first roller, the cardboard is driven by the first roller to move backward at the upper end of the table top.

[0007] Preferably, the cutting assembly includes a rocker, a double-thread screw, a movable block, a cutting blade, a second motor and a threaded groove; the rocker is rotatably mounted on the right outer wall of the second ear plate at the right end; the double-thread screw is rotatably mounted on the ends of the two second ear plates close to each other; the rocker is fixed to the right outer wall of the double-thread screw; two movable blocks are rotatably mounted on the outer wall of the double-thread screw; the front and rear outer walls of the movable block are in contact with the front and rear inner walls of the second groove body; the cutting blade is rotatably mounted in the groove body opened at the upper end of the movable block; the second motor is fixed to the ends of the movable blocks close to each other; The output shaft of the second motor passes through the movable block and is fixed to the cutting blade; thread grooves are provided on the left and right ends of the movable block; the two threads provided on the double-thread screw are in opposite directions; the inner wall of the thread groove is adapted to the outer wall of the double-thread screw. By rotating the rocker, since the thread groove and the double-thread screw have a threaded structure, the movable block is limited by the second groove body, so that the two movable blocks can be displaced on the double-thread screw, thereby adjusting the position of the cutting blade, and turning on the second motor causes the output shaft of the second motor to drive the cutting blade to rotate, thereby performing the cardboard cutting work.

[0008] Preferably, the clamping assembly includes a slide, a first fixed block, a limit block, a first electric cylinder, a clamping plate, a first limit groove and a rubber pad; a slide is provided at the upper end of the table; the slide is adapted to the table; the upper end of the slide is fixedly connected to the rubber pad; the ends of the two rubber pads away from each other are fixedly connected to the first fixed block; the upper end of the inner wall of the first fixed block is fixedly connected to the limit block; the other end of the limit block is fixedly connected to the upper outer wall of the rubber pad; the ends of the two first fixed blocks close to each other are fixedly connected to the first electric cylinder; the lower end of the output shaft of the first electric cylinder is fixedly connected to the clamping plate; the upper and lower outer walls of the clamping plate are penetrated by a first limit groove; the first limit groove is adapted to the limit block. When the cardboard is placed above the rubber pad, the first electric cylinder is opened, so that the output shaft of the first electric cylinder drives the clamping plate to extend downward, thereby clamping the cardboard at the upper end of the rubber pad, and then the slide is opened to make the slide slide on the upper end of the slide rail.

[0009] Preferably, the support assembly includes a support arm and a limiting column; the rear end of the first fixed block is fixedly connected to the support arm; the upper end of the right support arm is fixedly connected to the limiting column, and the support arm is used for support.

[0010] Preferably, the material transmission assembly includes a second electric cylinder, a first L-shaped fixing block, a second limiting groove, a third motor, a second roller and a second L-shaped fixing block; the right end outer wall of the left end support arm is fixedly connected to the second electric cylinder; the upper end of the output shaft of the second electric cylinder is fixedly connected to the first L-shaped fixing block; the outer wall of the limiting column is movably provided with a second L-shaped fixing block; the upper and lower ends of the second L-shaped fixing block are penetrated by a second limiting groove; the second limiting groove is adapted to the limiting column; the left end of the inner wall of the second L-shaped fixing block is fixedly connected to the third motor; the end where the first L-shaped fixing block and the second L-shaped fixing block are close to each other is rotatably installed with a second Roller; the output shaft of the third motor passes through the second L-shaped fixed block and is fixed to the second roller. When the cardboard is cut, the clamping plate and the vacuum suction cup stop clamping and adsorbing the cardboard. By turning on the second electric cylinder, the output shaft of the second electric cylinder drives the first L-shaped fixed block to move downward, so that the second roller and the second L-shaped fixed block move downward. The second L-shaped fixed block is limited by the second limiting groove. When the outer wall of the second roller fits the outer wall of the cardboard, the third motor is turned on so that the output shaft of the third motor drives the second roller to rotate, thereby discharging the cardboard under the second roller.

[0011] Preferably, the adsorption component includes a U-shaped fixing block, a vent tube and a vacuum suction cup; the upper end of the clamping plate is fixedly connected to the U-shaped fixing block; the lower end of the U-shaped fixing block is fixedly connected to the vent tube; the lower end of the vent tube is fixedly connected to the vacuum suction cup; the lower end of the vacuum suction cup and the lower end of the clamping plate are in the same horizontal plane, when the clamping plate moves downward to clamp the cardboard, the vacuum suction cup also moves downward at the same time, thereby adsorbing the center of the cardboard, when the first fixed block moves, the components on the U-shaped fixing block also move with the first fixed block, the vacuum suction cup adsorbs the center of the cardboard, and the clamping plate clamps the left and right ends of the cardboard, forming tension on the cardboard in three directions.

[0012] Beneficial effects of the utility model:

[0013] 1. By activating the first electric cylinder, the output shaft of the first electric cylinder drives the clamping plate to extend downward, thereby clamping the cardboard on the upper end of the rubber pad. When the first fixed block moves, the components on the U-shaped fixed block also move with the first fixed block. The vacuum suction cup also moves downward at the same time. The vacuum suction cup absorbs the center of the cardboard, and the clamping plate clamps the left and right ends of the cardboard, forming tension on the cardboard in three directions, solving the problem of inconvenient cardboard clamping.

[0014] 2. By turning on the second electric cylinder, the output shaft of the second electric cylinder drives the first L-shaped fixing block to move downward, causing the second roller and the second L-shaped fixing block to move downward. The second L-shaped fixing block is limited by the second limiting groove. When the outer wall of the second roller is in contact with the outer wall of the cardboard, the third motor is turned on, and the output shaft of the third motor drives the second roller to rotate, thereby discharging the cardboard under the second roller, solving the problem of inconvenient fast loading and unloading of cardboard;

[0015] 3. By rotating the rocker, since the thread groove and the double-thread screw are in a threaded structure, the movable block is limited by the second groove body, so that the two movable blocks can be displaced on the double-thread screw, thereby adjusting the position of the cutting blade, turning on the second motor so that the output shaft of the second motor drives the cutting blade to rotate, thereby cutting the cardboard. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a schematic diagram of the three-dimensional structure of a corrugated paper box trimming cutter of the present invention;

[0017] Figure 2 Shown is a three-dimensional structural diagram of a workbench assembly and a cutting assembly of a corrugated cardboard box trimming cutter of the present invention;

[0018] Figure 3 Shown is a schematic diagram of the three-dimensional structure of a clamping assembly of a corrugated cardboard box trimming cutter according to the present invention;

[0019] Figure 4 Shown is a schematic diagram of the three-dimensional structure of the support assembly and material transfer assembly of a corrugated cardboard box trimming cutter of the present invention;

[0020] Figure 5 Shown is a three-dimensional structural schematic diagram of an adsorption component of a corrugated cardboard box trimming cutter of the present invention.

[0021] The markings in the accompanying drawings are: 1- workbench assembly, 101- table, 102- first trough, 103- slide rail, 104- first ear plate, 105- first roller, 106- first motor, 107- second trough, 108- second ear plate, 2- cutting assembly, 201- rocker, 202- double-thread screw, 203- movable block, 204- cutting blade, 205- second motor, 206- thread groove, 3- clamping assembly, 301- slide, 302- first fixed block, 303 -Limiting block, 304-first electric cylinder, 305-clamping plate, 306-first limiting groove, 307-rubber pad, 4-support assembly, 401-support arm, 402-limiting column, 5-material transfer assembly, 501-second electric cylinder, 502-first L-shaped fixing block, 503-second limiting groove, 504-third motor, 505-second roller, 506-second L-shaped fixing block, 6-adsorption assembly, 601-U-shaped fixing block, 602-ventilation pipe, 603-vacuum suction cup. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] See also Figure 1 The utility model provides an embodiment: a corrugated cardboard box trimming cutter, including a workbench assembly 1; also including a cutting assembly 2, a clamping assembly 3, a supporting assembly 4, a material transfer assembly 5 and an adsorption assembly 6; the workbench assembly 1 is provided with a cutting assembly 2 for cutting; the workbench assembly 1 is provided with a clamping assembly 3 for sliding clamping; the clamping assembly 3 is provided with a supporting assembly 4 for supporting; the supporting assembly 4 is provided with a material transfer assembly 5 for feeding; the clamping assembly 3 is provided with an adsorption assembly 6 for adsorbing cardboard.

[0024] See also Figure 2In this embodiment, the workbench assembly 1 includes a table 101, a first trough 102, a slide rail 103, a first ear plate 104, a first roller 105, a first motor 106, a second trough 107 and a second ear plate 108; the upper end of the table 101 is provided with a symmetrical first trough 102; the upper end of the first trough 102 is fixedly connected to the slide rail 103; the front end of the table 101 is fixedly connected to the symmetrical first ear plates 104; the two first ear plates 104 are connected to each other. The first roller 105 is rotatably mounted on one end of the table 101; the outer wall of the first ear plate 104 on the right end is fixedly connected to the first motor 106; the output shaft of the first motor 106 passes through the first ear plate 104 and is fixedly connected to the outer wall of the right end of the first roller 105; the upper end of the table 101 is penetrated by a symmetrical second groove 107; the lower end of the table 101 is fixedly connected to a symmetrical second ear plate 108. The cutting assembly 2 includes a rocker 201, a double-thread screw 202, and a movable block 20 3. Cutting blade 204, second motor 205 and thread groove 206; the right end outer wall of the second ear plate 108 at the right end is rotatably installed with a rocker 201; the end of the two second ear plates 108 close to each other is rotatably installed with a double-thread screw 202; the rocker 201 is fixedly connected to the right end outer wall of the double-thread screw 202; the outer wall of the double-thread screw 202 is rotatably installed with two movable blocks 203; the front and rear outer walls of the movable block 203 are fitted with the front and rear inner walls of the second groove body 107; the cutting blade 204 is rotatably installed in the groove body opened at the upper end of the movable block 203; the second motor 205 is fixedly connected to the end of the movable block 203 close to each other; the output shaft of the second motor 205 passes through the movable block 203 and is fixed to the cutting blade 204; the left and right ends of the movable block 203 are penetrated by thread grooves 206; the two threads opened on the double-thread screw 202 are in opposite directions; the inner wall of the thread groove 206 is adapted to the outer wall of the double-thread screw 202.

[0025] See also Figure 3 In this embodiment, the clamping assembly 3 includes a slide 301, a first fixed block 302, a limit block 303, a first electric cylinder 304, a clamping plate 305, a first limit groove 306 and a rubber pad 307; the slide 301 is provided at the upper end of the table 101; the slide 301 is adapted to the table 101; the upper end of the slide 301 is fixedly connected to the rubber pad 307; the ends of the two rubber pads 307 that are away from each other are fixedly connected to the first fixed block 302; The upper end of the inner wall of the first fixed block 302 is fixedly connected to the limiting block 303; the other end of the limiting block 303 is fixedly connected to the upper outer wall of the rubber pad 307; the ends of the two first fixed blocks 302 close to each other are fixedly connected to the first electric cylinder 304; the lower end of the output shaft of the first electric cylinder 304 is fixedly connected to the clamping plate 305; the upper and lower outer walls of the clamping plate 305 are penetrated by a first limiting groove 306; the first limiting groove 306 is adapted to the limiting block 303.

[0026] See also Figure 4In this embodiment, the support assembly 4 includes a support arm 401 and a limiting column 402; the rear end of the first fixing block 302 is fixedly connected to the support arm 401; the upper end of the right support arm 401 is fixedly connected to the limiting column 402.

[0027] See also Figure 5 In this embodiment, the material transmission component 5 includes a second electric cylinder 501, a first L-shaped fixing block 502, a second limiting groove 503, a third motor 504, a second roller 505 and a second L-shaped fixing block 506; the right end outer wall of the left end support arm 401 is fixedly connected to the second electric cylinder 501; the upper end of the output shaft of the second electric cylinder 501 is fixedly connected to the first L-shaped fixing block 502; the outer wall of the limiting column 402 is movably provided with a second L-shaped fixing block 506; the upper and lower ends of the second L-shaped fixing block 506 are penetrated by a second limiting groove 503; the second limiting groove 503 is adapted to the limiting column 402; the inner wall of the second L-shaped fixing block 506 The left end is fixedly connected to the third motor 504; the second roller 505 is rotatably installed on the end where the first L-shaped fixing block 502 and the second L-shaped fixing block 506 are close to each other; the output shaft of the third motor 504 passes through the second L-shaped fixing block 506 and is fixed to the second roller 505, and the adsorption component 6 includes a U-shaped fixing block 601, a vent pipe 602 and a vacuum suction cup 603; the upper end of the clamping plate 305 is fixedly connected to the U-shaped fixing block 601; the lower end of the U-shaped fixing block 601 is fixedly connected to the vent pipe 602; the lower end of the vent pipe 602 is fixedly connected to the vacuum suction cup 603; the lower end of the vacuum suction cup 603 is in the same horizontal plane as the lower end of the clamping plate 305.

[0028] When the cardboard is placed on the first roller 105, the first motor 106 is turned on so that the output shaft of the first motor 106 drives the first roller 105 to rotate, and the first roller 105 drives the cardboard to move backward on the upper end of the table 101;

[0029] When a cardboard is placed on the rubber pad 307, the first electric cylinder 304 is turned on, causing the output shaft of the first electric cylinder 304 to drive the clamping plate 305 to extend downward, thereby clamping the cardboard on the upper end of the rubber pad 307. When the first fixing block 302 moves, the components on the U-shaped fixing block 601 also move with the first fixing block 302, and the vacuum suction cup 603 also moves downward, thereby sucking the center of the cardboard. The clamping plate 305 clamps the left and right ends of the cardboard.

[0030] When the cutting length needs to be adjusted, the rocker 201 is rotated. Since the thread groove 206 and the double-thread screw 202 are in a threaded structure, the movable block 203 is limited by the second groove body 107, so that the two movable blocks 203 can be displaced on the double-thread screw 202, thereby adjusting the position of the cutting blade 204. The second motor 205 is turned on so that the output shaft of the second motor 205 drives the cutting blade 204 to rotate. Then, the slide 301 is turned on and slides on the upper end of the slide rail 103, thereby cutting the cardboard.

[0031] When the cardboard is cut, the clamping plate 305 and the vacuum suction cup 603 stop clamping and adsorbing the cardboard. By turning on the second electric cylinder 501, the output shaft of the second electric cylinder 501 drives the first L-shaped fixed block 502 to move downward, so that the second roller 505 and the second L-shaped fixed block 506 move downward. The second L-shaped fixed block 506 is limited by the second limiting groove 503. When the outer wall of the second roller 505 is in contact with the outer wall of the cardboard, the third motor 504 is turned on, so that the output shaft of the third motor 504 drives the second roller 505 to rotate, thereby discharging the cardboard under the second roller 505.

[0032] Through the above steps, the corrugated cardboard is placed on the workbench assembly 1, the cardboard is driven to move by the roller on the workbench assembly 1, the cardboard is clamped by the clamping assembly 3, and the adsorption assembly 6 on the clamping assembly 3 adsorbs the cardboard. The cutting assembly 2 is opened by the movement of the clamping assembly 3 to cut and trim the cardboard. When the cutting is completed, the clamping assembly 3 and the adsorption assembly 6 release the clamping and adsorption of the cardboard, and the clamping assembly 3 is moved so that the material transfer assembly 5 is located above the cardboard. The material transfer assembly 5 is opened to frictionally displace the cardboard, and then it is returned to its position for the next set of work, which solves the problems of inconvenience in clamping the cardboard and inconvenience in quickly loading and unloading the cardboard.

[0033] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present invention.

Claims

1. A corrugated cardboard box trimming cutter, comprising a workbench assembly (1); characterized in that: The machine also comprises a cutting assembly (2), a clamping assembly (3), a supporting assembly (4), a material transfer assembly (5) and an adsorption assembly (6); the workbench assembly (1) is provided with a cutting assembly (2) for cutting; the workbench assembly (1) is provided with a clamping assembly (3) for sliding clamping; the clamping assembly (3) is provided with a supporting assembly (4) for supporting; the supporting assembly (4) is provided with a material transfer assembly (5) for feeding; the clamping assembly (3) is provided with an adsorption assembly for adsorbing cardboard. The assembly (6) comprises a slide (301), a first fixed block (302), a limit block (303), a first electric cylinder (304), a clamping plate (305), a first limit groove (306) and a rubber pad (307); the upper end of the table (101) is provided with a slide (301); the slide (301) is adapted to the table (101); the upper end of the slide (301) is fixedly connected to the rubber pad (307); the two rubber pads (307) are fixedly connected at one end away from each other A first fixed block (302) is provided; the upper end of the inner wall of the first fixed block (302) is fixedly connected to a limiting block (303); the other end of the limiting block (303) is fixedly connected to the upper outer wall of the rubber pad (307); one end of the two first fixed blocks (302) close to each other is fixedly connected to a first electric cylinder (304); the lower end of the output shaft of the first electric cylinder (304) is fixedly connected to a clamping plate (305); the upper and lower outer walls of the clamping plate (305) are penetrated by a first limiting groove (306); the first limiting The groove (306) is adapted to the limiting block (303), and the adsorption assembly (6) comprises a U-shaped fixing block (601), a vent pipe (602) and a vacuum suction cup (603); the upper end of the clamping plate (305) is fixedly connected to the U-shaped fixing block (601); the lower end of the U-shaped fixing block (601) is fixedly connected to the vent pipe (602); the lower end of the vent pipe (602) is fixedly connected to the vacuum suction cup (603); the lower end of the vacuum suction cup (603) and the lower end of the clamping plate (305) are in the same horizontal plane.

2. The corrugated cardboard box trimming cutter according to claim 1, characterized in that: The workbench assembly (1) comprises a table (101), a first trough (102), a slide rail (103), a first ear plate (104), a first roller (105), a first motor (106), a second trough (107) and a second ear plate (108); a symmetrical first trough (102) is provided at the upper end of the table (101); the slide rail (103) is fixedly connected to the upper end of the first trough (102); the symmetrical first ear plate (104) is fixedly connected to the front end of the table (101); 4); a first roller (105) is rotatably mounted on one end of the two first ear plates (104) close to each other; a first motor (106) is fixedly connected to the outer wall of the right end first ear plate (104); an output shaft of the first motor (106) passes through the first ear plate (104) and is fixedly connected to the right end outer wall of the first roller (105); a symmetrical second slot (107) is opened through the upper end of the table top (101); and a symmetrical second ear plate (108) is fixedly connected to the lower end of the table top (101).

3. The corrugated cardboard box trimming cutter according to claim 2, characterized in that: The cutting assembly (2) comprises a rocker (201), a double-thread screw (202), a movable block (203), a cutting blade (204), a second motor (205) and a thread groove (206); the rocker (201) is rotatably mounted on the right end outer wall of the right end second ear plate (108); the double-thread screw (202) is rotatably mounted on one end of the two second ear plates (108) close to each other; the rocker (201) is fixed to the right end outer wall of the double-thread screw (202); the outer wall of the double-thread screw (202) is rotatably mounted with two movable blocks (203); the front and rear ends of the movable block (203) are fixed to the right end outer wall of the double-thread screw (202); The outer wall is fitted with the inner walls of the front and rear ends of the second trough body (107); a cutting blade (204) is rotatably installed in the trough body opened at the upper end of the movable block (203); a second motor (205) is fixedly connected to one end of the movable block (203) that is close to each other; an output shaft of the second motor (205) passes through the movable block (203) and is fixedly connected to the cutting blade (204); a thread groove (206) is opened through the left and right ends of the movable block (203); the two threads opened on the double-thread screw (202) are in opposite directions; the inner wall of the thread groove (206) is adapted to the outer wall of the double-thread screw (202).

4. The corrugated cardboard box trimming cutter according to claim 1, characterized in that: The support assembly (4) comprises a support arm (401) and a limiting column (402); the rear end of the first fixed block (302) is fixedly connected to the support arm (401); and the upper end of the right support arm (401) is fixedly connected to the limiting column (402).

5. The corrugated cardboard box trimming cutter according to claim 4, characterized in that: The material transfer assembly (5) comprises a second electric cylinder (501), a first L-shaped fixing block (502), a second limiting groove (503), a third motor (504), a second roller (505) and a second L-shaped fixing block (506); the second electric cylinder (501) is fixedly connected to the outer wall of the right end of the left end support arm (401); the first L-shaped fixing block (502) is fixedly connected to the upper end of the output shaft of the second electric cylinder (501); the second L-shaped fixing block (506) is movably provided on the outer wall of the limiting column (402); the second The upper and lower ends of the L-shaped fixing block (506) are penetrated by second limiting grooves (503); the second limiting grooves (503) are adapted to the limiting pillars (402); a third motor (504) is fixedly connected to the left end of the inner wall of the second L-shaped fixing block (506); a second roller (505) is rotatably mounted on one end where the first L-shaped fixing block (502) and the second L-shaped fixing block (506) are close to each other; an output shaft of the third motor (504) passes through the second L-shaped fixing block (506) and is fixedly connected to the second roller (505).

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