Regenerated carton compression resistance detection equipment

Abstract

The utility model discloses regenerated carton compression resistance detection equipment, which comprises a base, the top of the base is in bolted connection with a carrier plate, the front side of the top of the carrier plate is provided with a moving structure, and through the arrangement of the base, the carrier plate, the moving structure, a carton placing plate, a limiting assembly, an electric control bracket and a pressure measuring structure, when compression resistance detection is carried out on a regenerated carton, firstly, the pressure measuring structure is used for measuring the compression resistance of the regenerated carton; a to-be-detected carton is placed on a carton placing plate, at the moment, a bidirectional electric push rod in a limiting assembly is started, the telescopic end of the rear side of the bidirectional electric push rod pushes a rear clamping frame, the telescopic end of the front side of the bidirectional electric push rod pushes a front clamping frame, the front clamping frame and the rear clamping frame move towards the middle from the front side and the rear side at the same time, and the carton is rapidly and accurately clamped and positioned; due to the effect of the two-way electric push rod, the carton placing device can adapt to cartons of different sizes, it is ensured that the cartons can be firmly fixed to the specific positions of the carton placing plates regardless of the sizes and the shapes of the cartons, complex position adjustment and judgment by operators are not needed, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a recycled cardboard box compression resistance detection device. Background Art

[0002] The raw materials of recycled cartons mainly come from recycled paper products, and their cost is relatively low. This gives recycled cartons a certain price advantage and can reduce packaging costs for enterprises. The recycled cardboard compression testing equipment is an advanced instrument specially designed to accurately evaluate the compression performance of recycled cardboard. It has important application value in the fields of carton production, quality control, and logistics packaging. It can provide key technical support for related industries to ensure that recycled cardboard can withstand the required pressure in actual use and ensure the safe transportation and storage of goods.

[0003] At present, the Chinese utility model with the announcement number CN217211953U discloses a carton pressure resistance testing device. This utility model relates to a carton pressure resistance testing device, including a device body, a load-bearing platform provided on the device platform, a conveying device provided on the load-bearing platform, a lifting bracket provided on the load-bearing platform, one end of the lifting bracket constituting a detection entrance, and the other end of the lifting bracket constituting a detection outlet, a displacement adjustment device installed on the lifting bracket, a pressure detection device installed on the displacement adjustment device, the pressure detection device including a positioning test frame connected to the displacement adjustment device, the positioning test frame is respectively provided with pressure testing devices at the top of the inner side, the front end of the inner side, and the tail end of the inner side, and a control device is provided on the device body. Thus, it is possible to realize testing while feeding, the temporary parking time during the test is short, and the next process can be quickly connected after the test is completed without manual intervention for transportation. According to the test needs, 1 to 3 points can be set to meet the top and side pressure resistance testing needs of conventional cartons and improve the test efficiency.

[0004] When using the existing recycled cardboard box compression resistance testing equipment, it takes a certain amount of time to transport the recycled cardboard box to the top of the lower pressure plate and adjust the position, which reduces work efficiency. In addition, it is difficult for the operator to place the cardboard box as close to the center of the lower pressure plate as possible. Due to the different sizes and shapes of the cardboard boxes, it is difficult for the operator to accurately judge the center position. Even after careful adjustment, position deviation is likely to occur. Moreover, during the transportation and adjustment process, the cardboard box may move due to human factors or the influence of the external environment, further increasing the uncertainty of the position adjustment. When the cardboard box is not placed in the center, the force distribution will be uneven when it is under pressure, which may cause some areas to be under too much or too little pressure. In this way, the data obtained from the test cannot accurately reflect the true compression resistance of the cardboard box, thereby affecting the judgment of the cardboard box quality. Utility Model Content

[0005] The main purpose of the utility model is to provide a recycled cardboard box compression resistance testing device, which aims to solve the problem that the existing recycled cardboard box compression resistance testing device, when in use, it takes a certain amount of time to transport the recycled cardboard box to the top of the lower pressure plate and adjust the position, thereby reducing work efficiency, and it is difficult for the operator to place the cardboard box as much as possible in the center of the lower pressure plate. Due to the different sizes and shapes of the cartons, it is difficult for the operator to accurately judge the center position. Even after hard adjustment, position deviation is likely to occur. Moreover, during the transportation and adjustment process, the cardboard box may move due to human factors or the influence of the external environment, further increasing the uncertainty of the position adjustment. When the cardboard box is not placed in the center, when it is subjected to pressure, the force distribution will be uneven, which may cause some areas to bear too much or too little pressure. In this way, the data obtained from the test cannot accurately reflect the true compression resistance of the carton, thereby affecting the judgment of the carton quality.

[0006] To achieve the above objectives, the present invention proposes a recycled cardboard box compression testing device comprising a base, a carrier plate bolted to the top of the base, a movable structure provided on the front side of the top of the carrier plate, a box placement plate bolted to the top of the movable structure, a limit assembly provided on the top of the box placement plate, an electric control bracket bolted to the top of the base, a pressure measuring structure provided inside the electric control bracket;

[0007] The limiting assembly includes a bidirectional electric push rod bolted to the right side of the top of the box plate, the telescopic end of the rear side of the bidirectional electric push rod is bolted to the rear clamping frame, and the telescopic end of the front side of the bidirectional electric push rod is bolted to the front clamping frame. The front clamping frame and the rear clamping frame are both located at the top of the box plate.

[0008] Preferably, the movable structure includes a slide groove opened on the top of the carrier plate, the internal thread of the slide groove is connected to a screw rod, the rear side of the screw rod passes through the rear side of the slide groove, the rear side of the carrier plate is bolted to a motor, the output end of the motor is bolted to the rear side of the screw rod, the surface of the screw rod is threadedly connected to a slider, the slider is slidably connected to the inside of the slide groove, and the top of the slider is bolted to the bottom of the box plate.

[0009] Preferably, the pressure measuring structure includes a crossbeam arranged inside the electric control bracket, support plates are bolted on both sides of the bottom of the crossbeam, and balance spring rods are provided on the front and rear sides of the top of the support plate. The bottom of the balance spring rod passes through the top of the support plate, and the bottom of the balance spring rod is bolted to an upper pressure plate. A force sensor is provided at the bottom of the crossbeam, and the sensing end of the force sensor is located at the top of the upper pressure plate.

[0010] Preferably, a controller is bolted to the front side of the right side of the top of the base, and the controller is electrically connected to the bidirectional electric push rod, the motor, the electric control bracket and the force sensor respectively, and a control screen is embedded in the top of the controller.

[0011] Preferably, balance pads are bolted to both sides of the bottom of the base, the balance pads are made of hard rubber material, and the bottom of the balance pads has anti-slip properties.

[0012] Preferably, fitting pads are bonded to the inner sides of the rear clamping frame and the front clamping frame, and the fitting pads are made of elastic cotton material.

[0013] Preferably, a sliding rod is fixedly connected to the left side of the front side of the rear clamping frame, and the front side of the sliding rod passes through the left side of the rear side of the front clamping frame.

[0014] Preferably, the top of the box board is paved with an anti-skid mat, the surface of which is provided with anti-skid lines.

[0015] In the technical solution of the present invention, by setting a base, a carrier plate, a mobile structure, a box placing plate, a limit assembly, an electric control bracket and a pressure measuring structure, when the recycled cardboard box is subjected to pressure resistance testing, first, the carton to be tested is placed on the box placing plate. At this time, the bidirectional electric push rod in the limit assembly is started, and the telescopic end of the rear side of the bidirectional electric push rod pushes the rear clamping frame, and the telescopic end of the front side pushes the front clamping frame. The front clamping frame and the rear clamping frame move toward the middle from the front and rear sides at the same time, and the carton is clamped and positioned quickly and accurately. Due to the action of the bidirectional electric push rod, it can adapt to cartons of different sizes, ensuring that no matter what the size and shape of the carton is, it can be firmly fixed in a specific position on the box placing plate, without the operator having to perform complicated position adjustment and judgment, which greatly improves work efficiency. Then, the box placing plate and the carton fixed thereon can be easily moved to the bottom of the pressure measuring structure through the mobile structure. This design ensures that the position of the carton can always be accurately determined during the entire process. The front and rear clamping frames correspond to each other, and the position of the carton will not be moved due to the clamping of the front and rear clamping frames, which ensures the certainty of the position adjustment. When the carton is directly below the pressure measuring structure, the electric control bracket starts the pressure measuring structure to perform a pressure test on the carton. Since the carton is precisely positioned in the center, it can ensure that the force is evenly distributed when it is under pressure, avoiding the situation where some areas are under too much or too little pressure. In this way, the data obtained from the test can accurately reflect the true pressure resistance of the carton, and provide a reliable basis for judging the quality of the carton. In summary, the recycled carton pressure resistance detection equipment effectively solves the problems of time-consuming, difficult position adjustment and inaccurate data in the use of existing equipment through the coordinated effect of limiting components, mobile structures, etc., thereby improving the detection efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the base structure of an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the limit assembly of an embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the mobile structure of an embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the pressure measurement structure of an embodiment of the present utility model.

[0022] Explanation of the accompanying numbers: 1. Base; 2. Carrying plate; 3. Moving structure; 301. Slide; 302. Screw; 303. Motor; 304. Slider; 4. Box plate; 5. Limiting assembly; 501. Bidirectional electric push rod; 502. Rear clamping frame; 503. Front clamping frame; 6. Electric control bracket; 7. Pressure measuring structure; 701. Crossbeam; 702. Support plate; 703. Balance spring rod; 704. Upper pressure plate; 705. Force sensor; 8. Controller; 9. Balance pad; 10. Fitting pad; 11. Sliding rod; 12. Anti-slip pad.

[0023] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] Moreover, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] The utility model provides a recycled cardboard box compression resistance testing device, which aims to solve the problem that the existing recycled cardboard box compression resistance testing device, when in use, it takes a certain amount of time to transport and place the recycled cardboard box on the top of the lower pressure plate and adjust the position, thereby reducing work efficiency, and it is difficult for the operator to place the cardboard box as much as possible in the center of the lower pressure plate. Since the sizes and shapes of the cartons are different, it is difficult for the operator to accurately judge the center position. Even after careful adjustment, position deviation is likely to occur. Moreover, during the transportation and adjustment process, the cardboard box may move due to human factors or the influence of the external environment, further increasing the uncertainty of the position adjustment. Therefore, when the cardboard box is not placed in the center, when it is subjected to pressure, the force distribution will be uneven, which may cause some areas to bear too much or too little pressure. In this way, the data obtained from the test cannot accurately reflect the true compression resistance performance of the carton, thereby affecting the judgment of the carton quality.

[0029] like Figure 1-5 As shown, an embodiment of the present invention provides a recycled cardboard box compression resistance testing device, comprising a base 1, a carrier plate 2 bolted to the top of the base 1, a movable structure 3 provided on the front side of the top of the carrier plate 2, a box placement plate 4 bolted to the top of the movable structure 3, a limit assembly 5 provided on the top of the box placement plate 4, an electric control bracket 6 bolted to the top of the base 1, and a pressure measuring structure 7 provided inside the electric control bracket 6;

[0030] The limiting assembly 5 includes a bidirectional electric push rod 501 bolted to the right side of the top of the box placing plate 4, the telescopic end of the rear side of the bidirectional electric push rod 501 is bolted to the rear clamping frame 502, and the telescopic end of the front side of the bidirectional electric push rod 501 is bolted to the front clamping frame 503, and the front clamping frame 503 and the rear clamping frame 502 are both located at the top of the box placing plate 4.

[0031] In the technical solution of the present invention, by setting a base 1, a carrier plate 2, a mobile structure 3, a box placing plate 4, a limiting component 5, an electric control bracket 6 and a pressure measuring structure 7, when the recycled cardboard box is subjected to a pressure test, first, the carton to be tested is placed on the box placing plate 4. At this time, the bidirectional electric push rod 501 in the limiting component 5 is started, and the telescopic end of the rear side of the bidirectional electric push rod 501 pushes the rear clamping frame 502, and the telescopic end of the front side pushes the front clamping frame 503. The front clamping frame 503 and the rear clamping frame 502 move toward the middle from the front and rear sides at the same time, and the carton is clamped and positioned quickly and accurately. Due to the action of the bidirectional electric push rod 501, it can adapt to cartons of different sizes, ensuring that no matter what the size and shape of the carton is, it can be firmly fixed in a specific position on the box placing plate 4, without the operator having to perform complicated position adjustment and judgment, which greatly improves work efficiency. Then, it can be easily moved through the mobile structure 3. Loosely move the carton plate 4 and the cartons fixed on it to the bottom of the pressure measuring structure 7. This design ensures that the position of the carton can always accurately correspond to the pressure measuring structure 7 during the entire process, avoiding the problem of position offset caused by inaccurate human placement. During the transportation and adjustment process, even if affected by the external environment or human factors, the carton will not move because it is tightly clamped by the front clamping frame 503 and the rear clamping frame 502, ensuring the certainty of the position adjustment. When the carton is located directly below the pressure measuring structure 7, the electric control bracket 6 starts the pressure measuring structure 7 to perform a pressure test on the carton. Since the carton is precisely positioned in the center, it can ensure that the force is evenly distributed when it is subjected to pressure, avoiding the situation where some areas are subjected to excessive or insufficient pressure. In this way, the data obtained from the test can accurately reflect the true pressure resistance of the carton, providing a reliable basis for judging the quality of the carton.

[0032] Please refer to Figure 4The movable structure 3 includes a slide groove 301 opened at the top of the carrier plate 2, and the internal thread of the slide groove 301 is connected to the screw rod 302, the rear side of the screw rod 302 passes through the rear side of the slide groove 301, and the rear side of the carrier plate 2 is bolted to the motor 303, and the output end of the motor 303 is bolted to the rear side of the screw rod 302. The surface of the screw rod 302 is threadedly connected to the slider 304, and the slider 304 is slidably connected to the inside of the slide groove 301, and the top of the slider 304 is bolted to the bottom of the box plate 4. In this embodiment, by setting the slide 301, the screw rod 302, the motor 303 and the slider 304, when the carton on the box placing plate 4 needs to be moved to the bottom of the pressure measuring structure 7, the motor 303 is started to drive the screw rod 302 to rotate. Since the screw rod 302 is threadedly connected to the slider 304, and the slider 304 is slidably connected in the slide 301, the rotation of the screw rod 302 will cause the slider 304 to move back and forth in the slide 301, and the top of the slider 304 is bolted to the box placing plate 4, thereby driving the box placing plate 4 and the cartons thereon to move smoothly to the designated position. This design makes the position adjustment of the cartons more accurate and automated, and eliminates the need for manual handling and adjustment, thereby greatly improving work efficiency.

[0033] For further information, please refer to Figure 5 The pressure measuring structure 7 includes a crossbeam 701 arranged inside the electric control bracket 6, and support plates 702 are bolted on both sides of the bottom of the crossbeam 701. Balance spring rods 703 are provided on the front and rear sides of the top of the support plate 702. The bottom of the balance spring rod 703 passes through the top of the support plate 702, and the bottom of the balance spring rod 703 is bolted to an upper pressure plate 704. A force sensor 705 is provided at the bottom of the crossbeam 701, and the sensing end of the force sensor 705 is located at the top of the upper pressure plate 704. In this embodiment, by setting the crossbeam 701, support plate 702, balance spring rod 703, upper pressure plate 704 and force sensor 705, when performing pressure resistance detection, the electric control bracket 6 controls the crossbeam 701 to descend, driving the support plate 702, balance spring rod 703 and upper pressure plate 704 to move downward together. After the upper pressure plate 704 contacts the carton, it continues to descend and compresses the balance spring rod 703. The function of the balance spring rod 703 is to ensure that the pressure applied by the upper pressure plate 704 to the carton is more uniform and stable, avoiding excessive instantaneous impact force to damage the carton or affect the accuracy of the test results. At the same time, the force sensor 705 can sense the reaction force from the carton on the upper pressure plate 704 in real time, that is, the pressure the carton is subjected to, and transmit the data to the controller 8 for processing and display. In this way, the pressure resistance of the carton can be accurately measured.

[0034] Please continue to refer to Figure 1A controller 8 is bolted to the front side of the top right side of the base 1. The controller 8 is electrically connected to the bidirectional electric push rod 501, the motor 303, the electric control bracket 6 and the force sensor 705 respectively. A control screen is embedded in the top of the controller 8. In this embodiment, by providing the controller 8, the controller 8 is electrically connected to the bidirectional electric push rod 501, the motor 303, the electric control bracket 6 and the force sensor 705 respectively, playing a role of centralized control. The operator can set the detection parameters, such as the speed of the motor 303, the descending speed of the electric control bracket 6, the telescopic length of the bidirectional electric push rod 501, etc., through the control screen on the top of the controller 8. The controller 8 receives the data from the force sensor 705, processes and displays it, so that the operator can intuitively understand the detection results. At the same time, the controller 8 can also automatically control the entire detection process according to a preset program, thereby improving the automation and accuracy of the detection.

[0035] Please refer to Figure 2 Balancing pads 9 are bolted to both sides of the bottom of the base 1. The balancing pads 9 are made of hard rubber material, and the bottom of the balancing pads 9 has anti-slip properties. In this embodiment, by providing the balancing pads 9, the balancing pads 9 at the bottom of the base 1 are made of hard rubber material and have anti-slip properties. The balancing pads 9 have the following main functions: first, they increase the friction between the device and the ground, ensuring that the device does not slip during operation, ensuring the stability and accuracy of the detection; second, the hard rubber material has a certain buffering effect, which can reduce the impact of vibration generated during the operation of the device on the detection results; third, the balancing pads 9 can keep the device stable even on uneven ground, expanding the scope of application of the device.

[0036] Also, please refer to Figure 3 The inner sides of the rear clamping frame 502 and the front clamping frame 503 are both bonded with a fitting pad 10 made of an elastic cotton material. In this embodiment, the fitting pad 10 is provided to increase the contact area with the carton when the bidirectional electric push rod 501 pushes the front clamping frame 503 and the rear clamping frame 502 to clamp the carton, thereby improving the clamping stability. The elastic cotton material has a certain degree of elasticity, which can adapt to cartons of different shapes and sizes while avoiding damage to the carton surface.

[0037] Also, please refer to Figure 3 The left side of the front side of the rear clamping frame 502 is fixedly connected to a slide bar 11, and the front side of the slide bar 11 passes through the left side of the rear side of the front clamping frame 503. In this embodiment, the slide bar 11 is provided to ensure that the movement direction of the front clamping frame 503 and the rear clamping frame 502 is always consistent when the bidirectional electric push rod 501 pushes the front clamping frame 503 and the rear clamping frame 502 to move, thereby preventing deviation or skew, thereby improving the accuracy and stability of clamping.

[0038] Also, please refer to Figure 1 , an anti-slip pad 12 is laid on the top of the box placing plate 4, and an anti-slip pattern is provided on the surface of the anti-slip pad 12. In this embodiment, the anti-slip pad 12 is provided to increase the friction between the carton and the box placing plate 4, thereby preventing the carton from sliding on the box placing plate 4, especially in the process of the moving structure 3 driving the box placing plate 4 to move, ensuring that the carton always remains in a fixed position, thereby providing a guarantee for subsequent accurate detection.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A recycled carton compression testing device, characterized in that: The recycled cardboard box compression resistance testing device comprises a base (1), a carrier plate (2) is bolted to the top of the base (1), a movable structure (3) is provided on the front side of the top of the carrier plate (2), a box placement plate (4) is bolted to the top of the movable structure (3), a limit assembly (5) is provided on the top of the box placement plate (4), an electric control bracket (6) is bolted to the top of the base (1), and a pressure measuring structure (7) is provided inside the electric control bracket (6); The limiting assembly (5) comprises a bidirectional electric push rod (501) bolted to the right side of the top of the box placing plate (4); the telescopic end on the rear side of the bidirectional electric push rod (501) is bolted to a rear clamping frame (502); the telescopic end on the front side of the bidirectional electric push rod (501) is bolted to a front clamping frame (503); and the front clamping frame (503) and the rear clamping frame (502) are both located on the top of the box placing plate (4).

2. The recycled carton compression testing device according to claim 1, characterized in that: The movable structure (3) comprises a chute (301) opened on the top of the carrier plate (2); the internal thread of the chute (301) is connected to a screw rod (302); the rear side of the screw rod (302) passes through the rear side of the chute (301); the rear side of the carrier plate (2) is bolted to a motor (303); the output end of the motor (303) is bolted to the rear side of the screw rod (302); the surface of the screw rod (302) is threadedly connected to a slider (304); the slider (304) is slidably connected to the inside of the chute (301); the top of the slider (304) is bolted to the bottom of the box plate (4).

3. The recycled carton compression testing device according to claim 1, characterized in that: The pressure measuring structure (7) includes a crossbeam (701) arranged inside the electric control bracket (6), support plates (702) are bolted to both sides of the bottom of the crossbeam (701), and a balance spring rod (703) is provided on the front and rear sides of the top of the support plate (702), the bottom of the balance spring rod (703) passes through the top of the support plate (702), and the bottom of the balance spring rod (703) is bolted to an upper pressure plate (704), and a force sensor (705) is provided at the bottom of the crossbeam (701), and the sensing end of the force sensor (705) is located at the top of the upper pressure plate (704).

4. The recycled carton compression testing device according to claim 1, characterized in that: A controller (8) is bolted to the front side of the top right side of the base (1), and the controller (8) is electrically connected to the bidirectional electric push rod (501), the motor (303), the electric control bracket (6) and the force sensor (705) respectively. A control screen is embedded in the top of the controller (8).

5. The recycled carton compression testing device according to claim 1, characterized in that: Both sides of the bottom of the base (1) are bolted with balancing pads (9), the balancing pads (9) are made of hard rubber material, and the bottom of the balancing pads (9) has anti-slip properties.

6. The recycled carton compression testing device according to claim 1, characterized in that: The inner sides of the rear clamping frame (502) and the front clamping frame (503) are both bonded with a fitting pad (10), and the fitting pad (10) is made of elastic cotton material.

7. The recycled carton compression testing device according to claim 1, characterized in that: The left side of the front side of the rear clamping frame (502) is fixedly connected with a sliding rod (11), and the front side of the sliding rod (11) passes through the left side of the rear side of the front clamping frame (503).

8. The recycled carton compression testing device according to claim 1, characterized in that: The top of the box placement plate (4) is paved with an anti-skid pad (12), and the surface of the anti-skid pad (12) is provided with anti-skid patterns.

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