Leather cutting device for shoe processing

Abstract

The utility model discloses a leather cutting device for shoe processing, and relates to the technical field of shoe manufacturing. The device comprises a workbench, a sliding groove used for installing a sliding part is formed in the workbench, feeding assemblies used for collecting and discharging leather are arranged on the two sides of the workbench, a leveling mechanism used for tensioning and adjusting the leather is arranged on one sides of the feeding assemblies, a translation mechanism is arranged on the workbench, and the translation mechanism is arranged on the workbench. A C-shaped support is connected between the translation mechanisms, a sliding groove is formed in the C-shaped support, and a collecting mechanism used for collecting formed leather is arranged in the sliding groove. A second rack on a first sliding block drives a gear to rotate, so that a first rack meshed with the other side drives a second sliding block and an ejection block to press downwards, cut and formed leather embedded in a forming cutter is ejected into a collecting mechanism, the subsequent cutting operation is prevented from being influenced by the leather, the cutting efficiency is improved, and the labor intensity of workers is reduced. And the cutter is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of shoe manufacturing, in particular to a leather cutting device for shoe processing. Background Technique

[0002] Leather is the animal skin that has been denatured and is not easy to rot after physical and chemical processing such as hair removal and tanning. Leather is composed of natural protein fibers tightly woven in three-dimensional space. Its surface has a special grain layer, with natural grain and luster, and a comfortable feel. The leather industry covers the main industries such as leather making, shoe making, leather clothing, leather goods, fur and its products, as well as supporting industries such as leather chemicals, leather hardware, leather machinery, and accessories.

[0003] An existing leather cutting device for shoe processing with the patent publication number of CN220555693U includes a support plate and a workbench. There are two support plates, which are respectively arranged at both ends of the bottom of the workbench. A pressing groove is opened in the middle of the upper surface of the workbench, and a blanking hole is opened at the bottom of the pressing groove. A vertical plate is arranged at the rear end of the front surface of the workbench. A driving roller, a driven roller and two rotating shafts are rotatably arranged on the front surface of the vertical plate. In the utility model, the driving roller is driven by a motor to drive the leather roll to rotate. The leather between the two rotating cylinders moves smoothly along the workbench under the action of the rotating cylinders. When the leather moves directly below the cutting mechanism, the motor is stopped, and the electric telescopic rod is started. The electric telescopic rod pushes the sliding plate downward so that the forming blade cuts the leather. The leather is collected by the collecting box. During cutting, positioning and pressing are carried out at the same time, with high cutting accuracy, convenient operation and high cutting efficiency.

[0004] However, in the above technical solution, after the tool cuts the leather, the cut and formed leather may be embedded in the tool, which may affect the subsequent cutting operation, reduce the operation efficiency, and may also damage the tool, increasing the production cost.

[0005] Therefore, a leather cutting device for shoe processing is proposed. Content of the Utility Model

[0006] The purpose of the utility model is to provide a leather cutting device for shoe processing to solve the problems raised in the above background technique. <{

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

[0008] A leather cutting device for shoe processing, comprising a workbench, on which a sliding groove for installing a sliding member is provided. Feeding and discharging assemblies for receiving and releasing leather are provided on both sides of the workbench. A flattening mechanism for tension adjustment of the leather is provided on one side of the feeding and discharging assemblies. A translation mechanism is provided on the workbench, and a C-shaped bracket is connected between the translation mechanisms. A sliding groove is provided on the C-shaped bracket, and a collection mechanism for collecting the formed leather is provided in the sliding groove. A blanking port is provided on the C-shaped bracket above the collection mechanism, and a pressing and ejecting mechanism for assisting in pressing and cutting the leather and ejecting the formed leather after cutting is provided on the C-shaped bracket above the blanking port.

[0009] Further, the translation mechanism includes a motor, a screw rod, and a sliding rod. The motor is fixedly installed on a side wall of the workbench. The screw rod and the sliding rod are respectively rotatably arranged and fixedly arranged in the sliding grooves on both sides of the workbench. A screw block is threadedly connected to the screw rod, and a slider is slidably arranged on the sliding rod. The opposite side walls of the screw block and the slider are fixedly connected to the side wall of the C-shaped bracket.

[0010] Further, the collection mechanism includes a collection box and a T-shaped slider. The bottom of the C-shaped bracket is provided with sliding grooves, and the number of the sliding grooves is two groups and they are symmetrically arranged. The T-shaped slider is slidably arranged in the sliding grooves. The corresponding side walls of the two T-shaped sliders are fixedly connected to the two side walls of the collection box. A limiting block is fixedly arranged on the C-shaped bracket on one side of the T-shaped slider, and a triangular block is fixedly arranged on one side of the limiting block. A limiting rod is rotatably installed between the triangular block and the upper part of the limiting block.

[0011] Further, the flattening mechanism includes a threaded rod, which is rotatably installed in the sliding groove of the workbench. One end of the threaded rod penetrates through a side wall of the workbench and is fixedly provided with a turning handle. A threaded block is threadedly connected to the threaded rod, and an auxiliary roller is rotatably arranged on one side wall of the threaded block.

[0012] Further, the pressing and ejecting mechanism includes an electric push rod and an installation bracket. The electric push rod is fixedly installed on the top of the C-shaped bracket. The telescopic end of the electric push rod penetrates through a side wall of the workbench and is fixedly connected to the top of the installation bracket. An installation plate is fixedly arranged at the bottom of the installation bracket, and a forming knife is installed at the bottom of the installation plate.

[0013] Furthermore, the pressing and ejecting mechanism further includes a fixed groove frame. The mounting plate is in a hollow shape. The fixed groove frame is fixedly installed on the top of the mounting plate. First sliding blocks are slidably arranged on both sides of the fixed groove frame. A pressing support is fixedly installed at the bottom of the two groups of first sliding blocks. A second sliding block is slidably arranged at the center of the fixed groove frame. Two groups of gears are rotatably installed on both sides of the second sliding block on the fixed groove frame. Second racks are fixedly installed on the opposite side walls of the two groups of first sliding blocks. First racks are fixedly installed on both side walls of the second sliding block. The first racks and one of the second racks on a group of opposite side walls are meshed with the gears. Multiple telescopic rods are fixedly installed on the fixed groove frame. The telescopic ends of the multiple telescopic rods are fixedly connected to the second sliding block. A return spring is sleeved on the multiple telescopic rods. An ejecting block is fixedly arranged at the bottom of the second sliding block. A rubber pad is fixedly arranged at the bottom of the pressing support. Both the ejecting block and the rubber pad are made of rubber material.

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

[0015] 1. By pressing down the mounting bracket of the present utility model, the pressing support drives the rubber pad to first contact the leather, realizing the auxiliary pressing of the leather. Subsequently, the forming knife cuts the leather, avoiding cutting errors caused by the movement or deformation of the leather, making the cutting edge smoother and more even, improving the appearance quality of the product. At the same time, after the pressing support and the rubber pad are attached to the leather, they continue to drive the first sliding block to slide upward along the fixed groove frame, causing the second rack on the first sliding block to drive the gear to rotate, and the first rack on the other side that is meshed drives the second sliding block and the ejecting block to press down, ejecting the leather cut and formed in the forming knife into the collection mechanism, preventing it from affecting subsequent cutting operations, improving the cutting efficiency, avoiding damage to the tool, and also avoiding the cumbersome and time-consuming manual cleaning, further improving the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0017] Figure 2 is a rear structural schematic diagram of the present utility model;

[0018] Figure 3 is a side sectional structural schematic diagram of the present utility model;

[0019] Figure 4 is a partial structural schematic diagram of the pressing and ejecting mechanism of the present utility model;

[0020] Figure 5 is an enlarged structural schematic diagram of A of the present utility model;

[0021] Reference numerals: 1, workbench; 2, C-shaped bracket; 3, loading component; 4, leveling mechanism; 401, turning handle; 402, threaded rod; 403, threaded block; 404, auxiliary roller; 5, sliding groove; 6, pressing and ejecting mechanism; 601, electric push rod; 602, mounting bracket; 603, first rack; 604, return spring; 605, gear; 606, first sliding block; 607, forming tool; 608, ejecting block; 609, rubber pad; 6010, pressing bracket; 6011, mounting plate; 6012, fixed groove frame; 6013, second rack; 6014, multi-stage telescopic rod; 6015, second sliding block; 7, blanking port; 8, collecting mechanism; 801, collecting box; 802, T-shaped slider; 803, limiting rod; 804, triangular block; 805, limiting block; 9, translation mechanism; 901, motor; 902, screw block; 903, screw rod; 904, slider; 905, slide bar. 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. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. The components of the embodiments of the present utility model usually 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 fall within the protection scope 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 when the product of the present utility model is usually placed. 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 shown Figures 1 to 5 in the figure, a leather cutting device for shoe processing includes a workbench 1. A chute for sliding member installation is provided on the workbench 1. Feeding and discharging components 3 for receiving and discharging leather are provided on both sides of the workbench 1. A flattening mechanism 4 for tension adjustment of the leather is provided on one side of the feeding and discharging components 3. A translation mechanism 9 is provided on the workbench 1. A C-shaped bracket 2 is connected between the translation mechanisms 9. A sliding groove 5 is formed on the C-shaped bracket 2. A collecting mechanism 8 for collecting formed leather is provided in the sliding groove 5. A blanking port 7 is provided on the C-shaped bracket 2 above the collecting mechanism 8. A pressing and ejecting mechanism 6 for assisting in pressing and cutting the leather and ejecting the formed leather after cutting is provided on the C-shaped bracket 2 above the blanking port 7. Specifically, when cutting a leather roll, first, the leather roll is set on the feeding and discharging components 3 for positioning, which is convenient for receiving and discharging materials during operation and reduces the burden on personnel. Subsequently, the leather is passed through the lower part of the flattening mechanism 4, and the tension of the leather roll is adjusted by the flattening mechanism 4, which is convenient for cutting operation and is also convenient for adapting to leathers of different thicknesses. Then, the pressing and ejecting mechanism 6 presses down onto the blanking port 7 and assists in pressing and cutting the leather into a formed shape, avoiding cutting errors caused by leather movement or deformation, making the cutting edge smoother and more even, improving the appearance quality of the product. Moreover, when the pressing and ejecting mechanism 6 rises, it synchronously ejects the leather adhered or embedded inside the cutter, preventing it from affecting subsequent cutting operations, improving the cutting efficiency, avoiding damage to the cutter, and also avoiding the cumbersome manual cleaning and time consumption, further improving the operation efficiency. And the translation mechanism 9 drives the C-shaped bracket 2 and the pressing and ejecting mechanism 6 to move, so that the pressing and ejecting mechanism 6 makes reasonable planning during cutting, reducing leather waste, improving material utilization rate, thus reducing production costs. And the formed leather ejected by the pressing and ejecting mechanism 6 is synchronously collected by the collecting mechanism 8 on the C-shaped bracket 2, which is convenient for centralized processing.

[0027] As shown Figure 3As shown in the figure, the translation mechanism 9 includes a motor 901, a screw rod 903 and a slide bar 905. The motor 901 is fixedly installed on one side wall of the workbench 1. The screw rod 903 and the slide bar 905 are respectively rotatably arranged and fixedly arranged in the two side chutes on the workbench 1. A screw block 902 is threadedly connected to the screw rod 903. A slider 904 is slidably arranged on the slide bar 905. The opposite side walls of the screw block 902 and the slider 904 are fixedly connected to the side wall of the C-shaped bracket 2. Specifically, the motor 901 drives the screw rod 903 to rotate, so that the screw block 902 drives the C-shaped bracket 2 and the pressing and ejecting mechanism 6 to move and cut, which is convenient for personnel to make a reasonable cutting plan according to the leather. By optimizing the cutting path and reducing repeated cutting, waste of leather is avoided, the material utilization rate is improved, and thus the production cost is reduced. The cooperation between the slide bar 905 and the slider 904 plays an auxiliary sliding role and improves the stability of the device.

[0028] As Figure 2 , Figure 3 , Figure 5 As shown in the figure, the collection mechanism 8 includes a collection box 801 and a T-shaped slider 802. Two sliding grooves 5 are opened at the bottom of the C-shaped bracket 2. The number of the sliding grooves 5 is two groups and they are symmetrically arranged. The T-shaped slider 802 is slidably arranged in the sliding groove 5. The corresponding side walls of the two T-shaped sliders 802 are fixedly connected to the two side walls of the collection box 801. A limit block 805 is fixedly arranged on the C-shaped bracket 2 on one side of the T-shaped slider 802. A triangular block 804 is fixedly arranged on one side of the limit block 805. A limit rod 803 is rotatably installed between the triangular block 804 and the upper part of the limit block 805. Specifically, the collection box 801 is convenient for collecting and processing the formed leather after cutting. At the same time, by being arranged integrally with the C-shaped bracket 2 and the pressing and ejecting mechanism 6, the collection box 801 can well collect the formed leather. At the same time, the arranged limit rod 803 is convenient for limiting the T-shaped slider 802 and the collection box 801, and the limit block 805 limits the rotated limit rod 803, so that the limit rod 803 can limit the T-shaped slider 802 and the collection box 801, avoiding the collection box 801 from slipping off during the movement process, improving safety. At the same time, the inclined side on one side of the triangular block 804 is convenient for placing the rotated limit rod 803, improving the operation convenience.

[0029] As Figure 2 , Figure 3As shown, the flattening mechanism 4 includes a threaded rod 402 which is rotatably installed in the chute of the workbench 1. One end of the threaded rod 402 penetrates through a side wall of the workbench 1 and is fixedly provided with a turning handle 401. A threaded block 403 is threadedly connected to the threaded rod 402, and an auxiliary roller 404 is rotatably arranged on one side wall of the threaded block 403. Specifically, by rotating the turning handle 401 to drive the threaded rod 402 to rotate, the threaded block 403 drives the auxiliary roller 404 to lift and lower synchronously, so as to adjust the tension of the leather, keep the leather in a stable flat state, neither too tight to cause deformation nor too loose to affect the cutting accuracy, which is convenient for subsequent cutting operations.

[0030] As Figure 3 , Figure 4 shown, the pressing and ejecting mechanism 6 includes an electric push rod 601 and a mounting bracket 602. The electric push rod �01 is fixedly arranged at the top of the C-shaped bracket 2. The telescopic end of the electric push rod 601 penetrates through a side wall of the workbench 1 and is fixedly connected to the top of the mounting bracket 602. A mounting plate 6011 is fixedly arranged at the bottom of the mounting bracket 602, and a forming knife 607 is installed at the bottom of the mounting plate 6011. Specifically, by driving the mounting bracket 602, the mounting plate 6011 and the forming knife 607 to press down onto the blanking port 7 by the electric push rod 601, the cutting operation of the leather is realized.

[0031] As Figure 3 , Figure 4As shown, the pressing and ejecting mechanism 6 further includes a fixed groove frame 6012. The mounting plate 6011 is in a hollow shape. The fixed groove frame 6012 is fixedly installed on the top of the mounting plate 6011. First sliding blocks 606 are slidably arranged on both sides of the fixed groove frame 6012. A pressing support 6010 is fixedly installed at the bottom of the two groups of first sliding blocks 606. A second sliding block 6015 is slidably arranged at the center of the fixed groove frame 6012. Two groups of gears 605 are rotatably installed on both sides of the second sliding block 6015 on the fixed groove frame 6012. Second racks 6013 are fixedly installed on the opposite side walls of the two groups of first sliding blocks 606. First racks 603 are fixedly installed on both side walls of the second sliding block 6015. The first rack 603 and one of the second racks 6013 on a group of opposite side walls are meshed with the gear 605. Multiple telescopic rods 6014 are fixedly installed on the fixed groove frame 6012. The telescopic ends of the multiple telescopic rods 6014 are fixedly connected to the second sliding block 6015. A return spring 604 is sleeved on the multiple telescopic rods 6014. An ejecting block 608 is fixedly arranged at the bottom of the second sliding block 6015. A rubber pad 609 is fixedly arranged at the bottom of the pressing support 6010. Both the ejecting block 608 and the rubber pad 609 are made of rubber. Specifically, by pressing down the mounting bracket 602, the pressing support 6010 drives the rubber pad 609 to first contact the leather, realizing the auxiliary pressing of the leather. Subsequently, the forming knife 607 cuts the leather, avoiding cutting errors caused by the movement or deformation of the leather, making the cutting edge smoother and improving the appearance quality of the product. At the same time, after the pressing support 6010 and the rubber pad 609 are attached to the leather, they continue to drive the first sliding block 606 to slide upward along the fixed groove frame 6012, so that the second rack 6013 on the first sliding block 606 drives the gear 605 to rotate, and the first rack 603 engaged on the other side drives the second sliding block 6015 and the ejecting block 608 to press down, ejecting the leather cut and formed in the forming knife 607 into the collecting mechanism 8, preventing it from affecting subsequent cutting operations, improving the cutting efficiency, avoiding damage to the tool, and also avoiding the cumbersome and time-consuming manual cleaning, further improving the operation efficiency. When the mounting bracket 602 rises, due to the weight of the pressing support 6010 itself and the elastic force exerted by the return spring 604 on the multiple telescopic rods 6014 on the second sliding block 6015, the second sliding block 6015 is reset above the forming knife 607, facilitating the next cutting operation. And through the hollow setting of the mounting plate 6011, it is convenient for the ejecting block 608 to move in the forming knife 607. Both the ejecting block 608 and the rubber pad 609 are made of rubber, increasing the friction while avoiding scratching the leather during cutting, improving the product quality.

[0032] In summary: When the leather roll needs to be cut, first, the leather roll is placed on the loading component 3 for positioning, which facilitates the feeding and discharging of materials during operation, reduces the burden on personnel. Subsequently, the leather is passed through the lower part of the flattening mechanism 4, and the tension of the leather roll is adjusted by the flattening mechanism 4, which facilitates the cutting operation and is also convenient for adapting to leathers of different thicknesses. Then, the pressing and ejecting mechanism 6 is pressed down onto the discharging opening 7 to assist in pressing and cutting the leather into shape, avoiding cutting errors caused by the movement or deformation of the leather, making the cutting edge smoother and more even, improving the appearance quality of the product. Moreover, when the pressing and ejecting mechanism 6 rises, it simultaneously ejects the leather adhered to or embedded in the tool to prevent it from affecting subsequent cutting operations, improving the cutting efficiency, avoiding damage to the tool, and also avoiding the cumbersome manual cleaning and time consumption, further improving the operation efficiency. Additionally, the translation mechanism 9 drives the C-shaped bracket 2 and the pressing and ejecting mechanism 6 to move, enabling the pressing and ejecting mechanism 6 to reasonably plan during cutting, reducing the waste of leather, improving the material utilization rate, thereby reducing the production cost. And the formed leather ejected by the pressing and ejecting mechanism 6 is collected synchronously by the collecting mechanism 8 on the C-shaped bracket 2, which is convenient for centralized processing.

[0033] The foregoing has shown and described 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, various changes and improvements will occur to the present invention, and all these changes and improvements 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. A leather cutting device for shoe processing, characterized in that, It includes a workbench (1) with a chute for sliding part installation provided thereon. Feeding components (3) for leather feeding and discharging are arranged on both sides of the workbench (1). A flattening mechanism (4) for leather tension adjustment is arranged on one side of the feeding components (3). A translation mechanism (9) is arranged on the workbench (1). A C-shaped bracket (2) is connected between the translation mechanisms (9). A sliding groove (5) is formed on the C-shaped bracket (2). A collecting mechanism (8) for collecting formed leather is arranged in the sliding groove (5). A discharging port (7) is arranged on the C-shaped bracket (2) above the collecting mechanism (8). A pressing and ejecting mechanism (6) for assisting in pressing and cutting the leather and ejecting the formed leather after cutting is arranged on the C-shaped bracket (2) above the discharging port (7).

2. The leather cutting device for shoe processing according to claim 1, characterized in that, The translation mechanism (9) includes a motor (901), a screw rod (903) and a slide rod (905). The motor (901) is fixedly installed on one side wall of the workbench (1). The screw rod (903) and the slide rod (905) are respectively rotatably arranged and fixedly arranged in the two side chutes of the workbench (1). A screw block (902) is threadedly connected to the screw rod (903). A slider (904) is slidably arranged on the slide rod (905). The opposite side walls of the screw block (902) and the slider (904) are fixedly connected to the side wall of the C-shaped bracket (2).

3. A leather cutting device for shoe processing according to claim 1, characterized in that, The collecting mechanism (8) includes a collecting box (801) and a T-shaped slider (802). The bottom of the C-shaped bracket (2) is provided with sliding grooves (5). The number of the sliding grooves (5) is two groups and they are symmetrically arranged. The T-shaped slider (802) is slidably arranged in the sliding groove (5). The corresponding side walls of the two T-shaped sliders (802) are fixedly connected to the two side walls of the collecting box (801). A limiting block (805) is fixedly arranged on the C-shaped bracket (2) on one side of the T-shaped slider (802). A triangular block (804) is fixedly arranged on one side of the limiting block (805). A limiting rod (803) is rotatably installed between the triangular block (804) and the upper part of the limiting block (805).

4. A leather cutting device for shoe processing according to claim 1, characterized in that, The flattening mechanism (4) includes a threaded rod (402). The threaded rod (402) is rotatably installed in the chute of the workbench (1). One end of the threaded rod (402) penetrates through one side wall of the workbench (1) and is fixedly provided with a turning handle (401). A threaded block (403) is threadedly connected to the threaded rod (402). An auxiliary roller (404) is rotatably arranged on one side wall of the threaded block (403).

5. A leather cutting device for shoe processing according to claim 1, wherein, The pressing and ejecting mechanism (6) includes an electric push rod (601) and a mounting bracket (602). The electric push rod (601) is fixedly arranged at the top of the C-shaped bracket (2). The telescopic end of the electric push rod (601) penetrates through one side wall of the workbench (1) and is fixedly connected to the top of the mounting bracket (602). A mounting plate (6011) is fixedly arranged at the bottom of the mounting bracket (602), and a forming cutter (607) is installed at the bottom of the mounting plate (6011).

6. A leather cutting device for shoe processing according to claim 5, characterized in that, The pressing and ejecting mechanism (6) further includes a fixed groove frame (6012). The mounting plate (6011) is in a hollow shape. The fixed groove frame (6012) is fixedly installed at the top of the mounting plate (6011). First sliding blocks (606) are slidably arranged on both sides of the fixed groove frame (6012). A pressing bracket (6010) is fixedly installed at the bottom of the two first sliding blocks (606). A second sliding block (6015) is slidably arranged at the center of the fixed groove frame (6012). Two gears (605) are rotatably installed on both sides of the fixed groove frame (6012) where the second sliding block (6015) is located. Second racks (6013) are fixedly installed on the opposite side walls of the two first sliding blocks (606). First racks (603) are fixedly installed on both side walls of the second sliding block (6015). The first racks (603) and one of the second racks (6013) on a set of opposite side walls are meshed with the gears (605). Multiple telescopic rods (6014) are fixedly installed on the fixed groove frame (6012). The telescopic ends of the multiple telescopic rods (6014) are fixedly connected to the second sliding block (6015). A return spring (604) is sleeved on the multiple telescopic rods (6014). A top block (608) is fixedly arranged at the bottom of the second sliding block (�015). A rubber pad (609) is fixedly arranged at the bottom of the pressing bracket (6010). Both the top block (608) and the rubber pad (609) are made of rubber.

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