Bamboo shaving board film covering device

Abstract

The utility model discloses a bamboo shaving board film covering device which comprises an installation frame, a push plate is fixedly installed in the installation frame and located at the upper end of a conveying belt, a bamboo shaving board film covering assembly is fixedly installed on the upper surface of the installation frame, and the bamboo shaving board film covering assembly is perpendicularly opposite to the conveying belt. And a gluing assembly and a jacking assembly are fixedly installed on the lower surface in the mounting frame, a linear sliding table is fixedly installed on the lower surface of the mounting frame, and a scratching knife is fixedly installed on the lower surface of a movable block of the linear sliding table and located in the middle of the jacking assembly. By the adoption of the bamboo shaving board gluing device, in the bamboo shaving board film coating process, film bonding is firmer, generated bubbles are rolled, pushed and squeezed out, the gluing amount of each set of bamboo shaving boards is uniform in the gluing process, the gluing amount is increased along with the length of the bamboo shaving boards, and therefore the bamboo shaving boards have stability and deviation prevention performance in the bamboo shaving board conveying process.

Description

Technical Field

[0001] The utility model relates to the technical field of bamboo particle board laminating production equipment, in particular to a bamboo particle board laminating device. Background Art

[0002] Bamboo particleboard is a board made of bamboo as raw material, which is a type of particleboard. The surface coating of bamboo particleboard is mainly to improve its water resistance, wear resistance, moisture resistance and anti-fouling properties. Commonly used coating materials include PVC film and film paper.

[0003] There is no laminating machine in the prior art that is specifically used for laminating bamboo particleboards, and the use of non-professional laminating equipment to laminat bamboo particleboards may bring the following disadvantages:

[0004] 1. Quality issues: Since there is no laminating machine specifically for bamboo particleboard, it is easy to cause problems such as poor adhesion, bubble generation or uneven stretching of the laminating material during the laminating process, which will affect the appearance and quality of the final product.

[0005] 2. Increased failure rate: Professional laminating machines are designed to handle specific materials and processes, so they are more stable and reliable, while using non-professional equipment may increase the risk of mechanical failure and affect production continuity.

[0006] 3. Poor product consistency: Professional laminating machines can ensure that the laminating effect of each batch of products is consistent; while non-professional equipment is prone to uneven product quality due to the mismatch between equipment performance and processed products. Utility Model Content

[0007] The purpose of the utility model is to provide a bamboo particleboard laminating device to solve the technical problems raised in the above background technology that there is no laminating machine specifically for bamboo particleboard, resulting in poor adhesion, bubble generation or uneven stretching of the laminating material and unstable quality caused by equipment mismatch during the laminating process.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A bamboo particle board coating device comprises a mounting frame, a mounting plate is fixedly mounted at one end of the mounting frame, a motor is fixedly mounted at one end of the mounting plate, a conveyor belt is transmission-mounted inside the mounting frame, the motor is sleeved on the outer surface of a transmission column of the conveyor belt through the transmission belt, a push plate is fixedly mounted inside the mounting frame, the push plate is located at the upper end of the conveyor belt, a bamboo particle board coating assembly is fixedly mounted on the upper surface of the mounting frame, the bamboo particle board coating assembly is vertically opposite to the conveyor belt, a glue coating assembly and a top pressing assembly are fixedly mounted on the lower surface of the mounting frame, a linear slide is fixedly mounted on the lower surface of the moving block of the linear slide, and a scratching knife is fixedly mounted on the lower surface of the scratching knife, and the scratching knife is located in the middle of the top pressing assembly.

[0010] As a further solution of the utility model, the bamboo particle board coating assembly includes two groups of docking plates and two groups of first connecting columns. A winding drum is rotatably installed between the two groups of docking plates, and a film is rolled up on the outer surface of the winding drum.

[0011] Two groups of first connecting columns are fixedly installed in the first plug-in cylinder, the first plug-in cylinder is fixedly installed on the lower surface of the mounting frame, the first sliding column is slidably installed in the first connecting column, the first connecting plate is fixedly installed on the lower surface of the first sliding column, and a film sticking cylinder is rotatably installed between the two groups of first connecting plates, and the film rolled up on the outer surface of the winding cylinder is connected to the outer surface of the film sticking cylinder.

[0012] As a further solution of the utility model, a first spring is sleeved on the outer surface of the first sliding column, and two ends of the first spring are respectively in contact between the lower surface of the first connecting column and the upper surface of the first connecting plate.

[0013] As a preferred embodiment of the utility model, the glue coating assembly includes a storage cylinder and two groups of second connecting columns. The storage cylinder is fixedly mounted on the lower surface of the mounting frame. The second connecting column is fixedly mounted in the second plug-in cylinder. The second plug-in cylinder is fixedly mounted on the lower surface of the mounting frame. A second sliding column is slidably mounted on the lower surface of the second connecting column. A second connecting plate is fixedly mounted on the lower surface of the second sliding column. A glue coating roller is rotatably mounted between the two groups of second connecting plates. The glue coating roller is rotatably sealed on the discharge port on the lower surface of the storage cylinder.

[0014] As a further solution of the utility model, a second spring is sleeved on the outer surface of the second sliding column, and two ends of the second spring respectively contact between the lower surface of the second connecting column and the upper surface of the second sliding column;

[0015] A glue storage groove is provided on the outer surface of the glue coating roller. When the glue storage groove is opposite to the discharge port of the storage cylinder, the glue in the storage cylinder can enter the glue storage groove.

[0016] As a preferred solution of the utility model, the top pressure assembly includes a connecting rod, which is slidably installed on the lower surface of the mounting frame, a roller pressing wheel is rotatably installed between two groups of connecting rods, a convex ring is fixedly installed on the outer surface of the connecting rod, and a third spring is sleeved on the outer surface of the connecting rod, and both ends of the third spring are respectively fixedly connected between the lower surface of the mounting frame and the upper surface of the convex ring.

[0017] Compared with the prior art, the beneficial effects of the bamboo particle board laminating device of the utility model are:

[0018] 1. When laminating the bamboo particleboard, the bamboo particleboard can be placed on the surface of the conveyor belt. As the conveyor belt conveys the bamboo particleboard, it will be pushed to the center by the push plates on both sides of the conveyor belt, and as the bamboo particleboard is continuously conveyed, it will be pressed to the lower surface of the pressing component. The pressing component will slide upward according to the thickness of the bamboo particleboard for adaptive adjustment. The bamboo particleboard that is pressed and fixed will be pressed to the lower surface of the glue coating component again. The glue coating component will slide upward according to the thickness of the bamboo particleboard for adaptive adjustment, and at the same time, through the transmission of the conveyor belt, the glue coating component will touch the bamboo. The upper surface of the particle board is rotated and glue is applied. The bamboo particle board after gluing will be pressed to the lower end by the bamboo particle board coating component again, and through the transmission of the conveyor belt, the bamboo particle board coating component is pressed against the upper surface of the bamboo particle board and rotated. The bamboo particle board coating component slides upward with the thickness of the bamboo particle board for adaptive adjustment, so that the bamboo particle board coating component can roll the film to the surface of the bamboo particle board, and the glue applied on the surface of the bamboo particle board is smoothed, so that the glue is evenly distributed on the bamboo particle board, avoiding the occurrence of loose adhesion and bubbles during the coating process.

[0019] 2. When the conveyor belt continues to convey the glued bamboo particleboard, the bamboo particleboard will be pushed to one end of the film sticking cylinder, and with the continuous pushing of the conveyor belt, the bamboo particleboard will open the top of the film sticking cylinder, and the film sticking cylinder can slide into the first connecting column through the first sliding column, and will be squeezed on one end of the first spring while sliding, and the first spring can apply a downward elastic thrust to the first connecting plate, so that the film sticking cylinder between the first connecting plates is tightly attached to the upper surface of the bamboo particleboard through the elastic thrust, and at the same time, through the transmission of the conveyor belt, the top of the film sticking cylinder touches the upper surface of the bamboo particleboard to lay the film, and with the film sticking roller pressure of the film sticking cylinder, the rubber roller on the surface of the bamboo particleboard can also be flattened, so that the glue is evenly distributed on the bamboo particleboard, so that the film bonding is more firm, and the generated bubbles can also be pushed out by the roller.

[0020] 3. As the conveyor belt conveys, the bamboo particle board will be pushed to the center by the push plates on both sides of the conveyor belt and pushed continuously. The bamboo particle board will push the connecting rod to open so that it is on the lower surface of the roller wheel. The lifted connecting rod will drive the roller wheel to move toward the upper end of the mounting frame and press on one end of the third spring at the same time. The third spring will exert a downward elastic thrust on the connecting rod, so that the connecting rod can drive the roller wheel to press tightly against the upper surface of the bamboo particle board through the elastic thrust, so that the bamboo particle board has stability and anti-bias during the conveying process, thereby making it accurate during the gluing and laminating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only examples of the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the conveyor belt in the embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the linear slide in the embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the motor-driven conveyor belt in the embodiment of the utility model;

[0026] Figure 5 It is a schematic diagram of the structure of the first plug-in tube and the second plug-in tube in the embodiment of the utility model;

[0027] Figure 6 This is a schematic structural diagram of a bamboo particle board laminating assembly in an embodiment of the utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the glue coating component in the embodiment of the utility model;

[0029] Figure 8 It is a schematic diagram of the structure of the top pressure assembly in the embodiment of the utility model.

[0030] 1. Mounting frame; 101. Mounting plate; 102. Motor; 103. Conveyor belt; 104. First plug-in cylinder; 105. Second plug-in cylinder; 106. Push plate; 2. Linear slide; 201. Scratching knife; 3. Pressing assembly; 301. Connecting rod; 302. Roller wheel; 303. Convex ring; 304. Third spring; 4. Bamboo particle board coating assembly; 401. Docking plate; 402. Winding drum; 403. First connecting column; 404. First spring; 405. First connecting plate; 406. Film sticking cylinder; 407. First slide column; 5. Gluing assembly; 501. Storage cylinder; 502. Second connecting column; 503. Second spring; 504. Second slide column; 505. Second connecting plate; 506. Gluing roller; 507. Glue storage tank. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the embodiments of the present invention.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal connection of two components; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] See also Figure 1-Figure 5 As shown, an embodiment of the utility model is a bamboo particle board coating device, comprising a mounting frame 1, a mounting plate 101 is fixedly mounted at one end of the mounting frame 1, a motor 102 is fixedly mounted at one end of the mounting plate 101, a conveyor belt 103 is transmission-installed in the mounting frame 1, the motor 102 is sleeved on the outer surface of the transmission column of the conveyor belt 103 through the transmission belt, a push plate 106 is fixedly mounted in the mounting frame 1, the push plate 106 is located at the upper end of the conveyor belt 103, a bamboo particle board coating component 4 is fixedly mounted on the upper surface of the mounting frame 1, the bamboo particle board coating component 4 is vertically opposite to the conveyor belt 103, a glue coating component 5 and a top pressing component 3 are fixedly mounted on the inner lower surface of the mounting frame 1, a linear slide 2 is fixedly mounted on the lower surface of the moving block of the linear slide 2, and the scratching knife 201 is fixedly mounted on the lower surface of the top pressing component 3.

[0035] Through the design of the conveyor belt 103, the linear slide 2, the cutter 201, the pressing component 3, the bamboo particle board coating component 4 and the gluing component 5, when coating the bamboo particle board, the bamboo particle board can be placed on the surface of the conveyor belt 103, and as the conveyor belt 103 is conveyed, the bamboo particle board will be pushed to the center by the push plates 106 on both sides of the conveyor belt 103, and as the conveyor belt 103 continues to be conveyed, the bamboo particle board will be pressed to the lower surface of the pressing component 3, and the pressing component 3 will slide upward with the thickness of the bamboo particle board to perform adaptive adjustment, and then the bamboo particle board that is fixed by the pressing will be pressed again to the lower surface of the gluing component 5, and the gluing component 5 will slide upward with the thickness of the bamboo particle board to perform adaptive adjustment, and at the same time through the conveyor The transmission of the conveyor belt 103 can make the glue coating component 5 touch the upper surface of the bamboo particle board and rotate to apply glue, and the bamboo particle board after gluing will be pressed to the lower end again by the bamboo particle board coating component 4, and through the transmission of the conveyor belt 103, the bamboo particle board coating component 4 can touch the upper surface of the bamboo particle board and rotate, and the bamboo particle board coating component 4 will also slide upward with the thickness of the bamboo particle board for adaptive adjustment, so that the bamboo particle board coating component 4 can roll the film to the surface of the bamboo particle board, and the glue applied on the surface of the bamboo particle board can be smoothed with the rolling, so that the glue can be evenly distributed on the bamboo particle board, thereby avoiding the occurrence of loose adhesion and bubble generation during the coating process.

[0036] Moreover, the top pressing component 3, the bamboo particle board coating component 4, and the glue coating component 5 can all slide upward to be adaptively adjusted according to the thickness of the bamboo particle board, so that the coating material on the surface of the bamboo particle board can have the characteristic of uniform stretching, avoiding the situation where the film is peeled off due to height difference due to insufficient fitting.

[0037] When the tail end of the coated bamboo particle board slides out from the lower surface of the top pressing component 3, the linear slide 2 between the top pressing components 3 will drive the cutting knife 201 to move horizontally to cut the film, and the coated bamboo particle board will be sent out by the conveyor belt 103 and pressed by an external hot press, so that the bamboo particle board can form a solid board structure.

[0038] like Figure 6 As shown, the bamboo particle board film coating assembly 4 includes two groups of docking plates 401 and two groups of first connecting columns 403. A winding drum 402 is rotatably installed between the two groups of docking plates 401, and a film is rolled up on the outer surface of the winding drum 402.

[0039] Two groups of first connecting columns 403 are fixedly installed in the first plug-in tube 104, and the first plug-in tube 104 is fixedly installed on the lower surface of the mounting frame 1. A first sliding column 407 is slidably installed in the first connecting column 403, and a first connecting plate 405 is fixedly installed on the lower surface of the first sliding column 407. A film sticking tube 406 is rotatably installed between the two groups of first connecting plates 405, and the film rolled up on the outer surface of the winding tube 402 is connected to the outer surface of the film sticking tube 406.

[0040] The first spring 404 is sleeved on the outer surface of the first sliding column 407 , and two ends of the first spring 404 are respectively in contact between the lower surface of the first connecting column 403 and the upper surface of the first connecting plate 405 .

[0041] Through the design of the winding drum 402, the film sticking drum 406, the first spring 404, the first connecting column 403 and the first sliding column 407, when the conveyor belt 103 continues to convey the glued bamboo particle board, the bamboo particle board will be pushed to one end of the film sticking drum 406, and as the conveyor belt 103 continues to push, the bamboo particle board can push the film sticking drum 406 to open, and the film sticking drum 406 can slide into the first connecting column 403 through the first sliding column 407, and while sliding, it will also be squeezed at one end of the first spring 404, and the first spring 404 can By applying a downward elastic thrust to the first connecting plate 405, the film-sticking tube 406 between the first connecting plates 405 can be tightly pressed against the upper surface of the bamboo particle board through the elastic thrust, and at the same time, through the transmission of the conveyor belt 103, the film-sticking tube 406 can be pressed against the upper surface of the bamboo particle board to lay the film, and with the film-sticking roller pressure of the film-sticking tube 406, the rubber roller on the surface of the bamboo particle board can also be flattened, so that the glue can be evenly distributed on the bamboo particle board, making the coating more firmly bonded, and the generated bubbles can also be squeezed out by the roller.

[0042] like Figure 7 As shown, the glue coating component 5 includes a storage cylinder 501 and two groups of second connecting columns 502. The storage cylinder 501 is fixedly installed on the lower surface of the mounting frame 1. The second connecting column 502 is fixedly installed in the second plug-in cylinder 105. The second plug-in cylinder 105 is fixedly installed on the lower surface of the mounting frame 1. A second sliding column 504 is slidably installed on the lower surface of the second connecting column 502. A second connecting plate 505 is fixedly installed on the lower surface of the second sliding column 504. A glue coating roller 506 is rotatably installed between the two groups of second connecting plates 505. The glue coating roller 506 is rotatably sealed on the discharge port on the lower surface of the storage cylinder 501.

[0043] A second spring 503 is sleeved on the outer surface of the second sliding column 504 , and two ends of the second spring 503 are respectively in contact between the lower surface of the second connecting column 502 and the upper surface of the second sliding column 504 .

[0044] A glue storage groove 507 is provided on the outer surface of the glue coating roller 506 . When the glue storage groove 507 faces the discharge port of the storage cylinder 501 , the glue in the storage cylinder 501 can enter the glue storage groove 507 .

[0045] Through the design of the storage cylinder 501, the second connecting column 502, the second spring 503, the second sliding column 504, the glue coating roller 506 and the glue storage tank 507, when gluing the bamboo particle board, and with the continuous pushing of the conveyor belt 103, the bamboo particle board can push the glue coating roller 506 open, and the glue coating roller 506 can slide into the second connecting column 502 through the second sliding column 504, and at the same time, it will also press on one end of the second spring 503, and the second spring 503 will apply a downward elastic thrust to the second connecting plate 505, so that the glue coating roller 506 between the second connecting plates 505 can be tightly attached to the upper surface of the bamboo particle board through the elastic thrust. At the same time, through the transmission of the conveyor belt 103, the glue coating roller 506 can be pressed against the upper surface of the bamboo particle board and rotated, and the rotating glue coating roller 506 will make the glue storage groove 507 opened on the surface face the discharge port of the storage tube 501, and the glue in the storage tube 501 can enter the glue storage groove 507, and with the continuous transmission, the glue storage groove 507 full of glue can be rolled over the surface of the bamboo particle board, and at the same time, the glue in the glue storage groove 507 can slide onto the surface of the bamboo particle board, that is, the gluing process is completed, and the glue application amount of each group of bamboo particle boards can be uniform, and the glue application amount will increase with the length of the bamboo particle board.

[0046] like Figure 8 As shown, the top pressure assembly 3 includes a connecting rod 301, which is slidably installed on the lower surface of the mounting frame 1, a roller pressing wheel 302 is rotatably installed between two groups of connecting rods 301, a convex ring 303 is fixedly installed on the outer surface of the connecting rod 301, and a third spring 304 is sleeved on the outer surface of the connecting rod 301, and both ends of the third spring 304 are respectively fixedly connected between the lower surface of the mounting frame 1 and the upper surface of the convex ring 303.

[0047] Through the design of the connecting rod 301, the roller 302 and the third spring 304, the staff can place the bamboo particle board on the surface of the conveyor belt 103, and as the conveyor belt 103 is conveyed, the bamboo particle board will be pushed to the center by the push plates 106 on both sides of the conveyor belt 103, and as the conveyor belt 103 continues to push, the bamboo particle board can push the connecting rod 301 to be located at the lower surface of the roller 302, and the lifted connecting rod 301 will drive the roller 302 to move toward the upper end of the mounting frame 1, and at the same time will also press on one end of the third spring 304, and the third spring 304 will apply a downward elastic thrust to the connecting rod 301, so that the connecting rod 301 can drive the roller 302 to be tightly pressed against the upper surface of the bamboo particle board through the elastic thrust, so that the bamboo particle board can be conveyed with stability and anti-bias, thereby making it accurate in the subsequent gluing and laminating process.

[0048] The above shows and describes the basic principles of the present invention. The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only intended to illustrate the principles of the present invention. Without departing from the scope of the present invention, any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A bamboo particle board laminating device, characterized in that: The invention comprises a mounting frame (1), a mounting plate (101) is fixedly mounted on one end of the mounting frame (1), a motor (102) is fixedly mounted on one end of the mounting plate (101), a conveyor belt (103) is installed in the mounting frame (1) for transmission, the motor (102) is sleeved on the outer surface of a transmission column of the conveyor belt (103) through the transmission belt, a push plate (106) is fixedly mounted in the mounting frame (1), and the push plate (106) is located at the upper end of the conveyor belt (103). A bamboo particle board coating component (4) is fixedly mounted on the upper surface of the mounting frame (1), and the bamboo particle board coating component (4) is vertically opposite to the conveyor belt (103). A gluing component (5) and a top pressing component (3) are fixedly mounted on the inner lower surface of the mounting frame (1). A linear slide (2) is fixedly mounted on the lower surface of the mounting frame (1), and a cutting knife (201) is fixedly mounted on the lower surface of the movable block of the linear slide (2), and the cutting knife (201) is located in the middle of the top pressing component (3).

2. The bamboo particle board laminating device according to claim 1, characterized in that: The bamboo particle board film coating assembly (4) comprises two groups of docking plates (401) and two groups of first connecting columns (403), a winding drum (402) is rotatably installed between the two groups of docking plates (401), and a film is rolled up on the outer surface of the winding drum (402); Two groups of the first connecting columns (403) are fixedly installed in the first plug-in tube (104), and the first plug-in tube (104) is fixedly installed on the lower surface of the mounting frame (1). A first sliding column (407) is slidably installed in the first connecting column (403), and a first connecting plate (405) is fixedly installed on the lower surface of the first sliding column (407). A film sticking tube (406) is rotatably installed between the two groups of the first connecting plates (405), and the film rolled up on the outer surface of the winding tube (402) is connected to the outer surface of the film sticking tube (406).

3. The bamboo particle board laminating device according to claim 2, characterized in that: The outer surface of the first sliding column (407) is sleeved with a first spring (404), and two ends of the first spring (404) are respectively pressed between the lower surface of the first connecting column (403) and the upper surface of the first connecting plate (405).

4. The bamboo particle board laminating device according to claim 1, characterized in that: The glue coating component (5) includes a storage cylinder (501) and two groups of second connecting columns (502), wherein the storage cylinder (501) is fixedly mounted on the lower surface of the mounting frame (1), the second connecting column (502) is fixedly mounted in the second plug-in cylinder (105), the second plug-in cylinder (105) is fixedly mounted on the lower surface of the mounting frame (1), a second sliding column (504) is slidably mounted on the lower surface of the second connecting column (502), a second connecting plate (505) is fixedly mounted on the lower surface of the second sliding column (504), a glue coating roller (506) is rotatably mounted between the two groups of the second connecting plates (505), and the glue coating roller (506) is rotatably sealed on the discharge port on the lower surface of the storage cylinder (501).

5. The bamboo particle board laminating device according to claim 4, characterized in that: A second spring (503) is sleeved on the outer surface of the second sliding column (504), and two ends of the second spring (503) are respectively in contact between the lower surface of the second connecting column (502) and the upper surface of the second sliding column (504); The outer surface of the glue coating roller (506) is provided with a glue storage groove (507), and when the glue storage groove (507) is opposite to the discharge port of the storage cylinder (501), the glue in the storage cylinder (501) can enter the glue storage groove (507).

6. The bamboo particle board laminating device according to claim 1, characterized in that: The pressing assembly (3) comprises a connecting rod (301), wherein the connecting rod (301) is slidably mounted on the lower surface of the mounting frame (1), a roller pressing wheel (302) is mounted on the other end of the connecting rod (301), a convex ring (303) is fixedly mounted on the outer surface of the connecting rod (301), and a third spring (304) is sleeved on the outer surface of the connecting rod (301), and two ends of the third spring (304) are respectively fixedly connected between the lower surface of the mounting frame (1) and the upper surface of the convex ring (303).

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