A full-automatic tapping device for embedded sleeve

Abstract

The utility model relates to pre -buried sleeve processing technical field discloses a pre -buried sleeve full -automatic tapping processingequipment, including processing frame and a plurality of drill bits, the top fixed coupling of processing frame has the processing table, the top left -hand member fixed coupling of processing table has the drive motor, the output between drive motor and a plurality of drill bits is provided with multithread transmission mechanism, the top right -hand member fixed coupling of processing table has the mounting panel, the top fixed coupling of mounting panel has the hydraulic column, the output fixed coupling of hydraulic column has the lower clamp plate, the top of lower clamp plate is provided with the upper clamp plate. In the utility model, through hydraulic column to promote lower clamp plate to drive processing spare movement, cooperation with the drill bit of rotation, magnetic attraction piece, antiskid pad auxiliary fixed processing spare, realized the tapping operation of a plurality of pre -buried sleeve processing spare simultaneously, improved processing efficiency, reduced artificial cost, promoted production benefit.

Description

Technical Field

[0001] This utility model relates to the field of pre-embedded sleeve processing technology, and in particular to a fully automatic tapping processing device for pre-embedded sleeves. Background Technology

[0002] As a type of connector, embedded sleeves have extremely wide applications in the construction and machinery manufacturing industries. In construction, embedded sleeves are used to connect various structural components to ensure the stability and safety of building structures. In the machinery manufacturing field, they are used to assemble mechanical equipment to ensure precise connection and coordinated operation between various components of the equipment. With the acceleration of industrial modernization, the demand for embedded sleeves is constantly increasing, and the requirements for their processing quality and efficiency are becoming increasingly stringent.

[0003] Traditional pre-embedded sleeve processing relies heavily on manual labor or semi-automated equipment. This processing mode has gradually revealed many limitations when facing the needs of large-scale production, and there is an urgent need for an efficient and precise fully automatic tapping processing device to meet the needs of industry development.

[0004] Existing pre-embedded sleeve tapping devices all adopt a single-processing method, meaning that only one pre-embedded sleeve is tapped at a time. The process involves manually or by machine placing the single workpiece in the processing position, then starting the equipment to tap. After completing one workpiece, the above steps are repeated for the next workpiece. This method avoids the operational chaos caused by processing multiple workpieces simultaneously to some extent and ensures the relative stability of the single processing process. However, since only one pre-embedded sleeve can be processed at a time, a large amount of the equipment's operating time is wasted on frequent loading and unloading and single processing cycles. From the perspective of component operation, the drive mechanism and transmission mechanism only serve a single workpiece in each processing cycle, failing to fully utilize their capacity. This results in extremely low overall processing efficiency and increased production costs. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a pre-embedded sleeve fully automatic tapping processing device, which aims to improve the problem that the existing technology of processing individual parts results in extremely low overall processing efficiency and increased production costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a fully automatic tapping device for pre-embedded sleeves, comprising a processing frame and multiple drill bits. A processing table is fixedly connected to the top of the processing frame, and a drive motor is fixedly connected to the top left end of the processing table. A multi-threaded transmission mechanism is provided between the output end of the drive motor and the multiple drill bits. A mounting plate is fixedly connected to the top right side of the processing table, and a hydraulic column is fixedly connected to the top of the mounting plate. A lower clamping plate is fixedly connected to the output end of the hydraulic column. An upper clamping plate is provided on the top of the lower clamping plate. Multiple clamping slots are provided on the top left side of the lower clamping plate and the bottom left side of the upper clamping plate. Each of the multiple clamping slots contains a processing part. Multiple fastening bolts are equidistantly threaded through the top of the upper clamping plate, and the ends of the multiple fastening bolts are equidistantly threaded to the top of the lower clamping plate.

[0007] As a further description of the above technical solution:

[0008] The multi-threaded transmission mechanism includes a drive rod. Multiple L-shaped brackets are fixedly connected to the top left side of the processing table. Rotating sleeves are rotatably connected to the right ends of the multiple L-shaped brackets. Drive gears are fixedly connected to the outside of the multiple rotating sleeves. Multiple single-shaped brackets are fixedly connected to the top center of the processing table. The outer right sides of the multiple rotating sleeves are rotatably connected inside the multiple single-shaped brackets. A portal frame is fixedly connected between the multiple L-shaped brackets. A reversing gear is rotatably connected to the top of the multiple portal frames. The outside of the multiple reversing gears meshes with the adjacent drive gears.

[0009] As a further description of the above technical solution:

[0010] Each of the multiple clamping slots has a magnetic absorbing piece fixedly connected to its right end, and each of the multiple magnetic absorbing pieces is magnetically connected to a multiple corresponding workpiece.

[0011] As a further description of the above technical solution:

[0012] The bottom front and rear sides of the lower clamping plate are fixedly connected with T-shaped sliders, and the front and rear ends of the top right side of the processing table are provided with T-shaped sliding grooves.

[0013] As a further description of the above technical solution:

[0014] A control console is fixedly connected to the top front right end of the processing frame, and the control console is electrically connected to the drive motor and hydraulic column.

[0015] As a further description of the above technical solution:

[0016] The top left and right sides of the upper clamping plate are fixedly connected with reinforcing ribs, and the front and rear ends of the top of the two reinforcing ribs are fixedly connected with handles.

[0017] As a further description of the above technical solution:

[0018] A protective shell is fixedly connected to the top of the processing table. The protective shell is sleeved on the outside of multiple drive gears and multiple reversing gears. A maintenance cover plate is engaged with the top of the protective shell.

[0019] As a further description of the above technical solution:

[0020] Each of the multiple clamping slots has an anti-slip pad fixedly connected inside, and each of the multiple anti-slip pads has an arc-shaped design.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, multiple drill bits are rotated synchronously by a drive motor through a multi-thread transmission mechanism. At the same time, a hydraulic column pushes a clamping plate to move the workpiece. In conjunction with the rotating drill bits, magnetic suction plates and anti-slip pads help to fix the workpiece, realizing efficient and precise tapping of multiple pre-embedded sleeve workpieces at the same time. This not only improves processing efficiency but also ensures the depth and quality of tapping. The operation is convenient and safe, and the processing process can be completed continuously and fully automatically, reducing labor costs and improving production efficiency.

[0023] 2. In this utility model, the drive motor drives the drive rod to rotate, which in turn drives the drive gear connected to it. The L-shaped bracket and the single-shaped bracket stably support the rotating sleeve, so that multiple drive gears work together. The drive gears drive the rotating sleeve to rotate synchronously. Since the drill bit is fixed at the right end of the rotating sleeve, multiple drill bits can rotate synchronously, thus achieving the effect that multiple workpieces can be tapped at the same time. This greatly improves the processing efficiency of the pre-embedded sleeve, shortens the processing cycle, meets the needs of large-scale production, and ensures precise and stable power transmission. Attached Figure Description

[0024] Figure 1 This is a perspective view of a pre-embedded sleeve fully automatic tapping device proposed in this utility model;

[0025] Figure 2 This is a top view of a pre-embedded sleeve fully automatic tapping device proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the multi-threaded transmission mechanism in a pre-embedded sleeve fully automatic tapping device proposed in this utility model;

[0027] Figure 4 This is a structural exploded view of the fastening bolt in the pre-embedded sleeve fully automatic tapping device proposed in this utility model;

[0028] Figure 5This is a schematic diagram of the clamping groove in a pre-embedded sleeve fully automatic tapping device proposed in this utility model.

[0029] Legend:

[0030] 1. Machining frame; 2. Multi-threaded transmission mechanism; 201. Drive rod; 202. L-shaped bracket; 203. Rotating sleeve; 204. Drive gear; 205. Single-shaped bracket; 206. Portal frame; 207. Reversing gear; 3. Machining table; 4. Drive motor; 5. Drill bit; 6. Mounting plate; 7. Hydraulic column; 8. Lower clamping plate; 9. Upper clamping plate; 10. Clamping groove; 11. Machining part; 12. Fastening bolt; 13. Magnetic suction plate; 14. T-shaped slider; 15. T-shaped slide; 16. Control console; 17. Reinforcing rib; 18. Handle; 19. Protective shell; 20. Inspection cover plate; 21. Anti-slip mat. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 2 and Figure 4 An embodiment of this utility model provides: a fully automatic tapping device for pre-embedded sleeves, including a processing frame 1 and multiple drill bits 5. A processing table 3 is fixedly connected to the top of the processing frame 1. A drive motor 4 is fixedly connected to the top left end of the processing table 3. A multi-thread transmission mechanism 2 is provided between the output end of the drive motor 4 and the multiple drill bits 5. A mounting plate 6 is fixedly connected to the top right side of the processing table 3. A hydraulic column 7 is fixedly connected to the top of the mounting plate 6. A lower clamping plate 8 is fixedly connected to the output end of the hydraulic column 7. An upper clamping plate 9 is provided on the top of the lower clamping plate 8. Multiple clamping grooves 10 are provided on the top left side of the lower clamping plate 8 and the bottom left side of the upper clamping plate 9. A processing part 11 is provided inside the multiple clamping grooves 10. Multiple fastening bolts 12 are equidistantly passed through the top of the upper clamping plate 9. The ends of the multiple fastening bolts 12 are equidistantly threaded to the top of the lower clamping plate 8.

[0033] Specifically, when the device is started, the drive motor 4 starts running, and the rotational power generated at its output end is transmitted to multiple drill bits 5 through the multi-threaded transmission mechanism 2. The multi-threaded transmission mechanism 2 can efficiently distribute and convert the single rotational output of the drive motor 4 into the synchronous rotation of multiple drill bits 5, thereby realizing the simultaneous tapping operation on multiple workpieces 11. On the top right side of the processing table 3, the mounting plate 6 is fixed on the processing table 3 to provide stable support for the hydraulic column 7. After the hydraulic column 7 is started, its output end begins to extend downward, driving the lower clamping plate 8 to move downward. The lower clamping plate 8 and the upper clamping plate 9 together form the clamping structure of the workpiece. Before processing, the workpiece 11 is placed in the clamping groove 10 on the top left side of the lower clamping plate 8, and then the upper clamping plate 9 and the lower clamping plate 8 are connected together by multiple fastening bolts 12 passing through the top of the upper clamping plate 9, and the workpiece 11 is firmly clamped. Within the clamping grooves 10 of the upper clamping plate 9 and the lower clamping plate 8, the workpiece 11 is ensured not to shift during the tapping process. As the drive motor 4 drives the drill bit 5 to rotate continuously, the hydraulic column 7 further pushes the lower clamping plate 8 and the clamped workpiece 11 to the left, causing the workpiece 11 to gradually approach the rotating drill bit 5. When the workpiece 11 contacts the drill bit 5, the drill bit 5 begins to tap the workpiece 11 with the cutting force generated by its high-speed rotation. During the tapping process, the hydraulic column 7 can precisely control the speed and force of the lower clamping plate 8 to ensure that the depth and quality of the tapping meet the requirements. After the tapping is completed, the hydraulic column 7 drives the lower clamping plate 8 to move to the right, causing the workpiece 11 to separate from the drill bit 5. At this time, the fastening bolt 12 is loosened, and the tapped workpiece 11 can be removed. Then, a new workpiece 11 is placed in, and the above operation is repeated to achieve continuous and fully automatic tapping of the pre-embedded sleeve.

[0034] Reference Figure 1 and Figure 3 The multi-threaded transmission mechanism 2 includes a drive rod 201. Multiple L-shaped brackets 202 are fixedly connected to the top left side of the processing table 3. Rotating sleeves 203 are rotatably connected to the right ends of the multiple L-shaped brackets 202. Drive gears 204 are fixedly connected to the outside of the multiple rotating sleeves 203. Multiple single-shaped brackets 205 are fixedly connected to the top center of the processing table 3. The outer right sides of the multiple rotating sleeves 203 are rotatably connected inside the multiple single-shaped brackets 205. A portal frame 206 is fixedly connected between the multiple L-shaped brackets 202. A reversing gear 207 is rotatably connected to the top of the multiple portal frames 206. The outside of the multiple reversing gears 207 is respectively meshed between the adjacent drive gears 204.

[0035] Specifically, after the device is started, the drive motor 4 operates, and the output rotational power directly acts on the drive rod 201, causing the drive rod 201 to start rotating. The rotating sleeve 203 obtains the condition for free rotation through the rotational connection with the right end of the L-shaped bracket 202. The drive gear 204 fixed to the outside of each rotating sleeve 203 receives the power transmitted from the drive rod 201. Multiple single-shaped brackets 205 fixed to the top center of the processing table 3 are responsible for auxiliary support and limiting. The outer right side of the rotating sleeve 203 is rotatably connected inside the single-shaped bracket 205 to ensure that the rotating sleeve 203 remains stable during rotation and will not shake or deviate, ensuring the accuracy of power transmission. At the same time, a portal frame 206 is fixedly connected between the multiple L-shaped brackets 202, and the reversing gear 207 rotates. The drive gear 204 is dynamically connected to the top of the gantry frame 206, and its exterior is meshed with adjacent drive gears 204. When the drive gear 204 rotates under the drive rod 201, the reversing gear 207 that is tightly meshed with it is also driven. The reversing gear 207 changes the direction of power transmission at this time. Through this gear meshing layout, the single rotation output of the drive motor 4 is distributed to multiple drive gears 204. These drive gears 204 are respectively connected to the corresponding rotating sleeves 203. The rotation of the drive gears 204 drives the rotating sleeves 203 to rotate synchronously. Since the drill bit 5 is fixed at the right end of the rotating sleeve 203, the synchronous rotation of multiple drill bits 5 can be achieved. In this way, multiple workpieces 11 can be tapped at the same time, which greatly improves the processing efficiency of the pre-embedded sleeve.

[0036] Reference Figure 1 , Figure 4 and Figure 5 Each of the multiple clamping slots 10 has a magnetic suction piece 13 fixedly connected to its right end, and each magnetic suction piece 13 is magnetically connected to a corresponding workpiece 11; T-shaped sliders 14 are fixedly connected to the front and rear sides of the bottom of the lower clamping plate 8, and T-shaped slide grooves 15 are opened at the front and rear ends of the top right side of the processing table 3; a control console 16 is fixedly connected to the front right end of the top of the processing frame 1, and the control console 16 is electrically connected to the drive motor 4 and the hydraulic column 7; reinforcing ribs 17 are fixedly connected to the left and right sides of the top of the upper clamping plate 9, and handles 18 are fixedly connected to the front and rear ends of the top of the two reinforcing ribs 17; a protective shell 19 is fixedly connected to the top of the processing table 3, and the protective shell 19 is fitted over the outside of multiple drive gears 204 and multiple reversing gears 207, and a maintenance cover plate 20 is engaged at the top of the protective shell 19; anti-slip pads 21 are fixedly connected to the inside of each of the multiple clamping slots 10, and each of the anti-slip pads 21 adopts an arc design;

[0037] Specifically, the magnetic suction plates 13 fixedly connected to the right end of the multiple clamping slots 10, when placing the workpiece 11, magnetically fix the workpiece 11 in the clamping slots 10, assisting the lower clamping plate 8, upper clamping plate 9, and fastening bolts 12 in more firmly clamping the workpiece 11, preventing displacement of the workpiece 11 before and during processing. The T-shaped sliders 14 fixedly connected to the front and rear sides of the bottom of the lower clamping plate 8 cooperate with the T-shaped slide grooves 15 opened at the front and rear ends of the right side of the top of the processing table 3. When the hydraulic column 7 drives the lower clamping plate 8 to move up and down, the T-shaped sliders 14 slide in the T-shaped slide grooves 15, providing guidance and stable support for the movement of the lower clamping plate 8, ensuring the accuracy and stability of the movement of the lower clamping plate 8, thereby ensuring the accurate relative position of the workpiece 11 and the drill bit 5, and improving the tapping accuracy. The control console 16 fixedly connected to the right side of the top of the processing frame 1 is electrically connected to the drive motor 4 and the hydraulic column 7. The operator inputs commands through the control console 16 to control the speed, start and stop of the drive motor 4, as well as the hydraulic column. The lifting speed and stroke parameters of the 7 allow for precise control of the entire tapping process, meeting different processing requirements. The reinforcing ribs 17 fixedly connected to the top left and right sides of the upper clamping plate 9 enhance the structural strength of the upper clamping plate 9, preventing deformation of the upper clamping plate 9 due to stress during the tightening of the fastening bolts 12, which would affect the clamping effect on the workpiece 11. The handles 18 fixedly connected to the front and rear ends of the top of the reinforcing ribs 17 facilitate manual lifting or lowering of the upper clamping plate 9 by the operator when installing or removing the workpiece 11, improving the convenience of operation. The protective shell 19 fixedly connected to the top of the processing table 3 is sleeved on the outside of multiple drive gears 204 and multiple reversing gears 207, providing protection and preventing external debris from entering the transmission mechanism and affecting the normal meshing and rotation of the gears. It also prevents the operator from accidentally touching the running gears, ensuring personnel safety. The inspection cover 20 snapped onto the top of the protective shell 19 can be easily opened when it is necessary to inspect, maintain or replace parts of the transmission mechanism, providing convenience for subsequent maintenance work.

[0038] Working principle: The rotational power generated by the output of the drive motor 4 is transmitted to multiple drill bits 5 through the multi-threaded transmission mechanism 2. The multi-threaded transmission mechanism 2 can efficiently distribute and convert the single rotational output of the drive motor 4 into the synchronous rotation of multiple drill bits 5, thereby realizing the simultaneous tapping operation on multiple workpieces 11. On the top right side of the processing table 3, the mounting plate 6 is fixed on the processing table 3 to provide stable support for the hydraulic column 7. After the hydraulic column 7 is started, its output end begins to extend downward, driving the lower clamping plate 8 to move downward. The lower clamping plate 8 and the upper clamping plate 9 together form the clamping structure of the workpiece. Before processing, the workpiece 11 is placed in the clamping groove 10 on the top left side of the lower clamping plate 8, and then the upper clamping plate 9 and the lower clamping plate 8 are connected together by multiple fastening bolts 12 passing through the top of the upper clamping plate 9. The workpiece 11 is securely clamped in the clamping groove 10 of the upper clamping plate 9 and the lower clamping plate 8, ensuring that the workpiece 11 will not be displaced during the tapping process. As the drive motor 4 drives the drill bit 5 to rotate continuously, the hydraulic column 7 further pushes the lower clamping plate 8 and the clamped workpiece 11 to the left, so that the workpiece 11 gradually approaches the rotating drill bit 5. When the workpiece 11 contacts the drill bit 5, the drill bit 5 starts to tap the workpiece 11 with the cutting force generated by the high-speed rotation. During the tapping process, the hydraulic column 7 can accurately control the speed and force of the lower clamping plate 8 to ensure that the depth and quality of tapping meet the requirements. After the tapping is completed, the hydraulic column 7 drives the lower clamping plate 8 to move to the right, so that the workpiece 11 is separated from the drill bit 5. At this time, the fastening bolt 12 can be loosened and the tapped workpiece 11 can be removed.

[0039] Furthermore, the rotational power output by the drive motor 4 directly acts on the drive rod 201, causing the drive rod 201 to start rotating. The rotating sleeve 203, through its rotational connection with the right end of the L-shaped bracket 202, gains the condition for free rotation. The drive gear 204 fixed to the outside of each rotating sleeve 203 receives the power transmitted from the drive rod 201. Multiple single-shaped brackets 205 fixed at the top center of the processing table 3 are responsible for auxiliary support and limiting. The outer right side of the rotating sleeve 203 is rotatably connected inside the single-shaped bracket 205, ensuring that the rotating sleeve 203 remains stable during rotation and does not wobble or deviate, thus ensuring the accuracy of power transmission. At the same time, multiple L-shaped brackets 202 are fixedly connected by a door. The portal frame 206 and the reversing gear 207 are rotatably connected to the top of the portal frame 206. The reversing gear 207 is meshed with the adjacent drive gears 204. When the drive gear 204 rotates under the drive rod 201, the reversing gear 207 that is tightly meshed with it is also driven. The reversing gear 207 changes the direction of power transmission at this time. Through this gear meshing layout, the single rotation output of the drive motor 4 is distributed to the multiple drive gears 204. These drive gears 204 are respectively connected to the corresponding rotating sleeves 203. The rotation of the drive gears 204 in turn drives the rotating sleeves 203 to rotate synchronously. Since the drill bit 5 is fixed at the right end of the rotating sleeve 203, the synchronous rotation of multiple drill bits 5 can be achieved.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fully automatic tapping device for pre-embedded sleeves, comprising a processing frame (1) and multiple drill bits (5), characterized in that: A processing table (3) is fixedly connected to the top of the processing frame (1). A drive motor (4) is fixedly connected to the top left end of the processing table (3). A multi-threaded transmission mechanism (2) is provided between the output end of the drive motor (4) and multiple drill bits (5). A mounting plate (6) is fixedly connected to the top right side of the processing table (3). A hydraulic column (7) is fixedly connected to the top of the mounting plate (6). A lower clamping plate (8) is fixedly connected to the output end of the hydraulic column (7). An upper clamping plate (9) is provided on the top of the lower clamping plate (8). Multiple clamping slots (10) are provided on the top left side of the lower clamping plate (8) and the bottom left side of the upper clamping plate (9). A processing part (11) is provided inside each of the multiple clamping slots (10). Multiple fastening bolts (12) are equidistantly threaded through the top of the upper clamping plate (9). The ends of the multiple fastening bolts (12) are equidistantly threaded to the top of the lower clamping plate (8).

2. The fully automatic tapping device for pre-embedded sleeves according to claim 1, characterized in that: The multi-threaded transmission mechanism (2) includes a drive rod (201). Multiple L-shaped brackets (202) are fixedly connected to the top left side of the processing table (3). Rotating sleeves (203) are rotatably connected to the right ends of the multiple L-shaped brackets (202). Drive gears (204) are fixedly connected to the outside of the multiple rotating sleeves (203). Multiple single-shaped brackets (205) are fixedly connected to the top center of the processing table (3). The outer right sides of the multiple rotating sleeves (203) are rotatably connected inside the multiple single-shaped brackets (205). A portal frame (206) is fixedly connected between the multiple L-shaped brackets (202). A reversing gear (207) is rotatably connected to the top of the multiple portal frames (206). The outside of the multiple reversing gears (207) is respectively meshed between the adjacent drive gears (204).

3. The fully automatic tapping device for pre-embedded sleeves according to claim 1, characterized in that: Each of the clamping slots (10) has a magnetic absorbing piece (13) fixedly connected to its inner right end, and each of the magnetic absorbing pieces (13) is magnetically connected to a corresponding workpiece (11).

4. The fully automatic tapping device for pre-embedded sleeves according to claim 1, characterized in that: The bottom front and rear sides of the lower clamping plate (8) are fixedly connected with T-shaped sliders (14), and the front and rear ends of the top right side of the processing table (3) are provided with T-shaped grooves (15).

5. The fully automatic tapping device for pre-embedded sleeves according to claim 1, characterized in that: A control console (16) is fixedly connected to the top front right end of the processing frame (1), and the control console (16) is electrically connected to the drive motor (4) and the hydraulic column (7).

6. The fully automatic tapping device for pre-embedded sleeves according to claim 1, characterized in that: The top left and right sides of the upper clamping plate (9) are fixedly connected with reinforcing ribs (17), and the front and rear ends of the top of the two reinforcing ribs (17) are fixedly connected with handles (18).

7. The fully automatic tapping device for pre-embedded sleeves according to claim 1, characterized in that: The top of the processing table (3) is fixedly connected to a protective shell (19), which is sleeved on the outside of multiple drive gears (204) and multiple reversing gears (207). A maintenance cover plate (20) is engaged on the top of the protective shell (19).

8. The fully automatic tapping device for pre-embedded sleeves according to claim 1, characterized in that: Each of the multiple clamping slots (10) is fixedly connected with an anti-slip pad (21), and each of the multiple anti-slip pads (21) adopts an arc-shaped design.

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