Cutting equipment for composite material fiber web production

Abstract

The utility model belongs to the technical field of fiber web production, and discloses cutting equipment for composite material fiber web production, which comprises a conveying mechanism, a production mechanism is arranged on the upper surface of the conveying mechanism, and the production mechanism comprises a fiber web. A positioning mechanism for limiting the conveying moving path of a fiber web at the upper end of the conveying mechanism is installed on the front face of the production mechanism, a fixing mechanism is arranged on the upper surface of the positioning mechanism, a limiting mechanism is installed on the upper surface of the conveying mechanism, and a cutting mechanism is arranged in the limiting mechanism. The lower surface of the positioning mechanism abuts against the upper surface of the fiber web conveyed at the upper end of the conveying mechanism, so that the follow-up positioning mechanism limits the moving position of the fiber web in the conveying process at the upper end of the conveying mechanism. Therefore, the situation that the fiber web cannot be cut into the preset shape due to the fact that the position of the fiber web deviates in the process that the fiber web is cut by a follow-up cutting mechanism is avoided as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of fiber web production, in particular to a cutting device for producing composite material fiber webs. Background Technique

[0002] Concrete admixture fiber web is also known as reticulated fiber or reticulated polypropylene fiber. The fiber web is a material made of polypropylene through special processing technology, and its appearance is a reticulated structure formed by the interconnection of multiple fiber filaments.

[0003] For example, the utility model with the publication number CN214772264U discloses a cutting device for producing composite material fiber webs, including a support plate. Four support legs are fixedly connected to the lower surface of the support plate. A controller, a production component, a conveying device, and two slide rails are fixedly connected to the upper surface of the support plate. The upper surface of the conveying device is connected with the original product. Each of the two slide rails is respectively connected with a slider. An installation plate is fixedly connected between the two sliders. Two groups of spring components and a group of ejector rods are fixedly connected to the lower surface of the installation plate. And a pressing plate is fixedly connected to the lower surface of each of the two groups of spring components. The lower surface of the ejector rod is fixedly connected with a connecting plate, and a cutter is fixedly connected to the lower surface of the connecting plate. By setting the conveying device to convey the original product, and by setting two groups of spring components and the two pressing plates connected thereto to effectively press the original product, it effectively avoids the displacement of the original product during the process of the cutter cutting after one group of ejector rods are ejected, and effectively improves the cutting accuracy and cutting efficiency.

[0004] In the process of implementing the present application, it is found that this technology has the following problems: The existing cutting device for producing composite material fiber webs lacks a mechanism for limiting the fiber web during the conveying process during use, resulting in the subsequent movement of the fiber web before cutting, thereby causing the shape of the fiber web cut by the subsequent cutting device not to meet the expected effect during the cutting process, thus reducing the practicability of the device.

[0005] Therefore, a cutting device for producing composite material fiber webs is proposed. Summary of the Utility Model

[0006] The purpose of the present utility model is to solve the problem that the existing cutting device for producing composite material fiber webs lacks a mechanism for limiting the fiber web during the conveying process during use, resulting in the subsequent movement of the fiber web before cutting, thereby causing the shape of the fiber web cut by the subsequent cutting device not to meet the expected effect. The present utility model provides a cutting device for producing composite material fiber webs.

[0007] The present utility model specifically adopts the following technical solutions to achieve the above purpose:

[0008] Cutting equipment for producing composite material fiber mesh, including a conveying mechanism, on the upper surface of the conveying mechanism is provided a production mechanism, the production mechanism includes a fiber mesh, on the front of the production mechanism is installed a positioning mechanism for restricting the conveying and moving path of the fiber mesh at the upper end of the conveying mechanism, on the upper surface of the positioning mechanism is provided a fixing mechanism, on the upper surface of the conveying mechanism is installed a limiting mechanism, and inside the limiting mechanism is provided a cutting mechanism.

[0009] Furthermore, the positioning mechanism includes a fixing plate and a hinge. The front of the production mechanism is hinged with a fixing plate through the hinge. On the lower surface of the fixing plate is provided a hydraulic cylinder, and at the output end of the hydraulic cylinder is installed a fixing frame. On the lower surfaces of the left and right sides of the fixing frame are installed multiple groups of positioning pulleys, and the positions of the multiple groups of positioning pulleys are all directly above the fiber mesh at the upper end of the conveying mechanism.

[0010] Furthermore, the limiting mechanism includes an L-shaped fixing plate installed on the upper surface of the conveying mechanism. Inside the inner side wall of the L-shaped fixing plate is provided a clamping groove, and inside the clamping groove is slidably connected a U-shaped fixing plate. At the top of the inner wall of the L-shaped fixing plate is provided an electric telescopic rod, and at the output end of the electric telescopic rod is installed on the upper surface of the U-shaped fixing plate. On the lower surfaces of the front and rear sides of the U-shaped fixing plate are provided anti-slip blocks. On the upper surface of the L-shaped fixing plate is provided a through hole, and inside the through hole is slidably connected a positioning rod, and the lower surface of the positioning rod is installed on the upper surface of the U-shaped fixing plate.

[0011] Furthermore, on the upper surface of the fixing plate are provided two groups of through holes, and inside the two groups of through holes are slidably connected limiting rods, and the lower surfaces of the two groups of limiting rods are installed on the upper surface of the fixing frame.

[0012] Furthermore, the fixing mechanism includes a fixing block and a connecting block. The connecting block is installed on the upper surface of the fixing plate, the fixing block is installed on the upper surface of the production mechanism. On the fronts of the fixing block and the connecting block are provided through holes, and inside the through hole of the connecting block is slidably connected an insertion rod. On the upper surface of the production mechanism is provided a groove, and the positions of the groove inside the production mechanism and the through hole inside the fixing block are both on the moving path of the insertion rod.

[0013] Furthermore, the cutting mechanism includes two groups of positioning blocks. A groove is formed at the top of the inner wall of the U-shaped fixing plate. The two groups of positioning blocks are respectively installed at the top of the left and right inner walls of the groove of the U-shaped fixing plate. Through holes are formed in the two groups of positioning blocks. A bidirectional threaded rod is rotatably connected inside the two through holes. A handle is installed on the left side of the bidirectional threaded rod. Two sliding plates are threadedly connected to the outside of the bidirectional threaded rod. The two sliding plates are both slidably connected inside the groove of the U-shaped fixing plate. Card slots are formed on the sides of the two sliding plates. Cutting tools are slidably connected inside the two card slots. Pull handles are arranged on the fronts of the two cutting tools.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. By starting the hydraulic cylinder to push the fixed frame to drive multiple positioning pulleys to move, the lower surfaces of the multiple positioning pulleys are respectively abutted and attached to the upper surface of the fiber mesh, so that the subsequent fiber mesh drives the rollers inside the multiple positioning pulleys to rotate during the process of conveying and moving, and further restricts the moving position of the fiber mesh during the conveying process at the upper end of the conveying mechanism by the subsequent multiple positioning pulleys, thereby minimizing the deviation of the position of the fiber mesh during the subsequent cutting process by the cutting mechanism and preventing the fiber mesh from being cut into a predetermined shape.

[0016] 2. Since the lower surfaces of the two cutting tools and the lower surfaces of the two anti-sliding blocks are kept parallel, the lower surfaces of the subsequent two cutting tools synchronously follow the lower surfaces of the two anti-sliding blocks to abut against the upper surface of the fiber mesh. Then, by pulling the two pull handles to drive the two cutting tools to move, the subsequent two cutting tools cut the fiber mesh during the moving process, thus completing the production cutting of the fiber mesh; by rotating the handle to drive the bidirectional threaded rod to trigger the two sliding plates to slide inside the groove of the U-shaped fixing plate, and since the two cutting tools are installed inside the card slots of the two sliding plates, the distance between the subsequent two cutting tools can be adjusted and moved, so that the subsequent cutting mechanism can cut fiber meshes of different shapes during use, thereby expanding the cutting range of the subsequent cutting mechanism during use, and therefore improving the practicability of the device. Description of the Drawings

[0017] Figure 1 is the front structural schematic diagram of the present utility model;

[0018] Figure 2 is the side structural schematic diagram of the present utility model;

[0019] Figure 3 is the bottom structural schematic diagram of the cutting mechanism of the present utility model;

[0020] Figure 4 is the present utility model Figure 1 the enlarged view at A in.

[0021] Reference numerals: 1, conveying mechanism; 2, production mechanism; 3, positioning mechanism; 301, fixing plate; 302, hydraulic cylinder; 303, fixing frame; 304, directional pulley; 305, hinge; 4, limiting rod; 5, limiting mechanism; 501, L-shaped fixing plate; 502, electric telescopic rod; 503, U-shaped fixing plate; 504, anti-slip block; 505, positioning rod; 6, cutting mechanism; 601, cutter; 602, positioning block; 603, handle; 604, bidirectional threaded rod; 605, slide plate; 606, handle; 7, fixing mechanism; 701, fixing block; 702, connecting block; 703, inserting rod. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0024] It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0026] As Figures 1 to 4As shown in the figure, the cutting equipment for producing composite material fiber webs includes a conveying mechanism 1. A production mechanism 2 is arranged on the upper surface of the conveying mechanism 1. The production mechanism 2 includes a fiber web. A positioning mechanism 3 for restricting the moving path of the fiber web during conveyance on the upper end of the conveying mechanism 1 is installed on the front surface of the production mechanism 2. A fixing mechanism 7 is arranged on the upper surface of the positioning mechanism 3. A limiting mechanism 5 is installed on the upper surface of the conveying mechanism 1. A cutting mechanism 6 is arranged inside the limiting mechanism 5. Specifically, by starting the positioning mechanism 3, the lower surface of the positioning mechanism 3 is abutted against the upper surface of the fiber web conveyed on the upper end of the conveying mechanism 1, so that the subsequent positioning mechanism 3 restricts the moving position of the fiber web during conveyance on the upper end of the conveying mechanism 1, thereby minimizing the occurrence of the fiber web shifting during the subsequent cutting process by the cutting mechanism 6, which may cause the fiber web to not be cut into the predetermined shape.

[0027] As Figure 1 , Figure 2 and Figure 4 shown in the figure, the positioning mechanism 3 includes a fixing plate 301 and a hinge 305. The fixing plate 301 is hinged to the front surface of the production mechanism 2 through the hinge 305. A hydraulic cylinder 302 is arranged on the lower surface of the fixing plate 301. A fixing frame 303 is installed at the output end of the hydraulic cylinder 302. Multiple groups of positioning pulleys 304 are installed on the lower surfaces of the left and right sides of the fixing frame 303. The positions of the multiple groups of positioning pulleys 304 are all directly above the fiber web on the upper end of the conveying mechanism 1.

[0028] Specifically, before the subsequent cutting mechanism 6 cuts the fiber web, by starting the hydraulic cylinder 302 to push the fixing frame 303 to drive the multiple groups of positioning pulleys 304 to move, the lower surfaces of the multiple groups of positioning pulleys 304 are respectively abutted and attached to the upper surface of the fiber web, so that the subsequent fiber web drives the rollers inside the multiple groups of positioning pulleys 304 to rotate during the conveyance and movement process, thereby enabling the subsequent multiple groups of positioning pulleys 304 to restrict the moving position of the fiber web during conveyance on the upper end of the conveying mechanism 1, thereby minimizing the occurrence of the fiber web shifting during the subsequent cutting process by the cutting mechanism 6, which may cause the fiber web to not be cut into the predetermined shape. By rotatably connecting the fixing plate 301 to one side of the production mechanism 2 close to the cutting mechanism 6, it enables subsequent workers to adjust the position of the positioning mechanism 3 when adjusting the position of the fiber web on the upper end of the conveying mechanism 1, thereby minimizing the subsequent positioning mechanism 3 from blocking the normal adjustment and movement of the fiber web by the workers.

[0029] As Figures 1 to 3As shown, the limiting mechanism 5 includes an L-shaped fixing plate 501, which is installed on the upper surface of the conveying mechanism 1. A clamping groove is formed on the inner side wall of the L-shaped fixing plate 501, and a U-shaped fixing plate 503 is slidably connected inside the clamping groove. The top of the inner wall of the L-shaped fixing plate 501 is provided with an electric telescopic rod 502, and the output end of the electric telescopic rod 502 is installed on the upper surface of the U-shaped fixing plate 503. Anti-sliding blocks 504 are arranged on the lower surfaces of the front and rear sides of the U-shaped fixing plate 503. A through hole is formed on the upper surface of the L-shaped fixing plate 501, and a positioning rod 505 is slidably connected inside the through hole. The lower surface of the positioning rod 505 is installed on the upper surface of the U-shaped fixing plate 503. Specifically, before the subsequent cutting mechanism 6 cuts the fiber web, by starting the electric telescopic rod 502 to push the U-shaped fixing plate 503 to drive the two anti-sliding blocks 504 to move, the lower surfaces of the two anti-sliding blocks 504 are abutted against the upper surface of the fiber web at the upper end of the conveying mechanism 1, so that the subsequent limiting mechanism 5 positions the cutting part of the cutting mechanism 6, thereby minimizing the movement of the entire set of fiber webs at the upper end of the conveying mechanism 1 during the cutting process by the subsequent cutting mechanism 6. Therefore, the stability of the subsequent fiber web during cutting is improved.

[0030] As Figure 1 and Figure 2 shown, two through holes are formed on the upper surface of the fixing plate 301, and two limiting rods 4 are slidably connected inside the two through holes. The lower surfaces of the two limiting rods 4 are installed on the upper surface of the fixing frame 303. Specifically, since the lower surfaces of the two limiting rods 4 are installed on the upper surface of the fixing frame 303, the subsequent two limiting rods 4 move synchronously with the fixing frame 303 during use. Then, since the two limiting rods 4 are slidably connected inside the two through holes of the fixing plate 301, the subsequent two limiting rods 4 limit the moving position of the fixing frame 303 during use, thereby minimizing the bending of the subsequent hydraulic cylinder 302 during use. Therefore, the service life of the positioning mechanism 3 is improved.

[0031] As Figure 4 shown, the fixing mechanism 7 includes a fixing block 701 and a connecting block 702. The connecting block 702 is installed on the upper surface of the fixing plate 301, and the fixing block 701 is installed on the upper surface of the production mechanism 2. Through holes are formed on the fronts of the fixing block 701 and the connecting block 702. A plug rod 703 is slidably connected inside the through hole of the connecting block 702. A groove is formed on the upper surface of the production mechanism 2, and the positions of the groove inside the production mechanism 2 and the through hole inside the fixing block 701 are both on the moving path of the plug rod 703;

[0032] Specifically, when the subsequent positioning mechanism 3 restricts the conveying path of the fiber web at the upper end of the conveying mechanism 1, by pushing the insertion rod 703, the back surface of the insertion rod 703 is inserted into the through hole of the fixed block 701, so that the fixing mechanism 7 restricts the rotation position of the positioning mechanism 3 on the front surface of the conveying mechanism 1, thereby minimizing the rotation of the subsequent positioning mechanism 3 during use; when the subsequent staff adjusts the position of the moving fiber web at the upper end of the conveying mechanism 1, by rotating the fixing plate 301 to drive the connecting block 702 and the insertion rod 703 to rotate, the position of the insertion rod 703 is adjusted and moved to the directly upper end of the groove of the production mechanism 2, and then by pushing the insertion rod 703, the back surface of the insertion rod 703 is inserted into the groove of the production mechanism 2, so that the fixing mechanism 7 positions the position of the positioning mechanism 3 after rotation, and further enables the subsequent staff to adjust the position of the moving fiber web without manually supporting the fixing plate 301, thereby reducing the labor consumption of the subsequent staff when adjusting the moving fiber web.

[0033] As Figures 1 to 3 shown, the cutting mechanism 6 includes two groups of positioning blocks 602. Grooves are provided at the top of the inner wall of the U-shaped fixing plate 503. The two groups of positioning blocks 602 are respectively installed at the top of the left and right inner walls of the groove of the U-shaped fixing plate 503. Through holes are provided inside the two groups of positioning blocks 602. A bidirectional threaded rod 604 is rotatably connected inside the two through holes. A handle 603 is installed on the left side of the bidirectional threaded rod 604. Two groups of sliding plates 605 are threadedly connected to the outside of the bidirectional threaded rod 604. The two groups of sliding plates 605 are both slidably connected inside the groove of the U-shaped fixing plate 503. Slots are provided on the sides of the two groups of sliding plates 605. Cutting tools 601 are slidably connected inside the two slots. Pulling handles 606 are provided on the fronts of the two groups of cutting tools 601;

[0034] Specifically, when the lower surfaces of the subsequent two groups of anti-sliding blocks 504 abut against the upper surface of the fiber web, by keeping the lower surfaces of the two groups of cutting tools 601 parallel to the lower surfaces of the two groups of anti-sliding blocks 504, the lower surfaces of the subsequent two groups of cutting tools 601 synchronously follow the lower surfaces of the two groups of anti-sliding blocks 504 to abut against the upper surface of the fiber web, and then by pulling the two pulling handles 606 to drive the two groups of cutting tools 601 to move, so that the subsequent two groups of cutting tools 601 cut the fiber web during the movement, thereby completing the production cutting of the fiber web; by rotating the handle 603 to drive the bidirectional threaded rod 604 to trigger the two groups of sliding plates 605 to slide inside the groove of the U-shaped fixing plate 503, and then by installing the two groups of cutting tools 601 inside the slots of the two groups of sliding plates 605, the distance between the subsequent two groups of cutting tools 601 can be adjusted and moved, and further the subsequent cutting mechanism 6 can cut fiber webs of different shapes during use, thereby expanding the cutting range of the subsequent cutting mechanism 6 during use, and thus improving the practicability of the device.

[0035] In summary: By starting the hydraulic cylinder 302 to push the fixed frame 303 to drive multiple positioning pulleys 304 to move, the lower surfaces of the multiple positioning pulleys 304 are respectively abutted and attached to the upper surface of the fiber web, so that the internal rollers of the multiple positioning pulleys 304 are driven to rotate during the subsequent transmission and movement of the fiber web, and then the subsequent multiple positioning pulleys 304 limit the movement position of the fiber web during the transmission process at the upper end of the transmission mechanism 1, thereby minimizing the deviation of the position of the fiber web during the subsequent cutting process by the cutting mechanism 6, which may otherwise result in the fiber web being unable to be cut into the predetermined shape; By starting the electric telescopic rod 502 to push the U-shaped fixing plate 503 to drive the two anti-sliding blocks 504 to move, the lower surfaces of the two anti-sliding blocks 504 are both abutted against the upper surface of the fiber web at the upper end of the transmission mechanism 1, so that the subsequent limiting mechanism 5 positions the cutting part of the cutting mechanism 6, thereby minimizing the movement of the entire set of fiber web at the upper end of the transmission mechanism 1 during the subsequent cutting process of the cutting mechanism 6 on the fiber web.

[0036] Meanwhile, by keeping the lower surfaces of the two cutting tools 601 parallel to the lower surfaces of the two anti-sliding blocks 504, the lower surfaces of the subsequent two cutting tools 601 synchronously follow the lower surfaces of the two anti-sliding blocks 504 and abut against the upper surface of the fiber web. Then, by pulling the two handles 606 to drive the two cutting tools 601 to move, the subsequent two cutting tools 601 cut the fiber web during the movement process, thus completing the production and cutting of the fiber web; By rotating the handle 603 to drive the bidirectional threaded rod 604 to trigger the two sliding plates 605 to slide inside the groove of the U-shaped fixing plate 503, and then by installing the two cutting tools 601 inside the card slots of the two sliding plates 605, the distance between the subsequent two cutting tools 601 can be adjusted and moved, so that the subsequent cutting mechanism 6 can cut fiber webs of different shapes during use, thereby expanding the cutting range of the subsequent cutting mechanism 6 during use.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Cutting equipment for producing composite material fiber webs, comprising a conveying mechanism (1), characterized in that: A production mechanism (2) is arranged on the upper surface of the conveying mechanism (1). The production mechanism (2) includes a fiber web. A positioning mechanism (3) for restricting the conveying and moving path of the fiber web at the upper end of the conveying mechanism (1) is installed on the front surface of the production mechanism (2). A fixing mechanism (7) is arranged on the upper surface of the positioning mechanism (3). A limiting mechanism (5) is installed on the upper surface of the conveying mechanism (1). A cutting mechanism (6) is arranged inside the limiting mechanism (5).

2. The cutting device for producing a composite material fiber web according to claim 1, characterized in that: The positioning mechanism (3) includes a fixing plate (301) and a hinge (305). The fixing plate (301) is hinged to the front surface of the production mechanism (2) through the hinge (305). A hydraulic cylinder (302) is arranged on the lower surface of the fixing plate (301). A fixing frame (303) is installed at the output end of the hydraulic cylinder (302). Multiple groups of positioning pulleys (304) are installed on the lower surfaces of the left and right sides of the fixing frame (303). The positions of the multiple groups of positioning pulleys (304) are all directly above the fiber web at the upper end of the conveying mechanism (1).

3. The cutting device for producing a composite material fiber web according to claim 1, characterized in that: The limiting mechanism (5) includes an L-shaped fixing plate (501). The L-shaped fixing plate (501) is installed on the upper surface of the conveying mechanism (1). A clamping groove is formed on the inner side wall of the L-shaped fixing plate (501). A U-shaped fixing plate (503) is slidably connected inside the clamping groove. An electric telescopic rod (502) is arranged at the top of the inner wall of the L-shaped fixing plate (501). The output end of the electric telescopic rod (502) is installed on the upper surface of the U-shaped fixing plate (503). Anti-slip blocks (504) are arranged on the lower surfaces of the front and rear sides of the U-shaped fixing plate (503). A through hole is formed on the upper surface of the L-shaped fixing plate (501). A positioning rod (505) is slidably connected inside the through hole. The lower surface of the positioning rod (505) is installed on the upper surface of the U-shaped fixing plate (503).

4. The cutting device for producing a composite material fiber web according to claim 2, wherein: Two groups of through holes are formed on the upper surface of the fixing plate (301). Two limiting rods (4) are slidably connected inside the two groups of through holes. The lower surfaces of the two limiting rods (4) are installed on the upper surface of the fixing frame (303).

5. The cutting device for producing a composite material fiber web according to claim 2, characterized in that: The fixing mechanism (7) includes a fixing block (701) and a connecting block (702). The connecting block (702) is installed on the upper surface of the fixing plate (301). The fixing block (701) is installed on the upper surface of the production mechanism (2). Through holes are formed on the front surfaces of the fixing block (701) and the connecting block (702). A plug rod (703) is slidably connected inside the through hole of the connecting block (702). A groove is formed on the upper surface of the production mechanism (2). The positions of the groove inside the production mechanism (2) and the through hole inside the fixing block (701) are both on the moving path of the plug rod (703).

6. The cutting device for producing a composite material fiber web according to claim 3, characterized in that: The cutting mechanism (6) includes two groups of positioning blocks (602). A groove is formed at the top of the inner wall of the U-shaped fixing plate (503). The two groups of positioning blocks (602) are respectively installed at the top of the left and right inner walls of the groove of the U-shaped fixing plate (503). Through holes are formed in the two groups of positioning blocks (602). A bidirectional threaded rod (604) is rotatably connected inside the two through holes. A handle (603) is installed on the left side of the bidirectional threaded rod (604). Two groups of sliding plates (605) are threadedly connected to the outside of the bidirectional threaded rod (604). The two groups of sliding plates (605) are both slidably connected inside the groove of the U-shaped fixing plate (503). Card slots are formed on the sides of the two groups of sliding plates (605). Cutting tools (601) are slidably connected inside the two card slots. Pull handles (606) are arranged on the fronts of the two groups of cutting tools (601).

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