Tire stud embedding machine with protection mechanism

Abstract

The present application relates to the technical field of tire stud embedding machine, more specifically, it is a kind of tire stud embedding machine with protection mechanism, including control box, base, top seat and electric screwdriver, the control box is arranged on the base, top seat is movably arranged on the control box, the electric screwdriver is arranged on the top seat, the stud embedding machine further includes: material conveying structure, which is arranged on the base, for transporting tires;Stud embedding assembly is arranged on the top seat and connected with the electric screwdriver, for adjusting the position of the electric screwdriver and conveying the stud to the electric screwdriver;And protection assembly is arranged on the base, for fixing the position of the tire and protecting the stud embedding process;The whole device has high degree of automation, gets rid of the traditional exposed stud embedding mode and adopts sealed stud embedding work, avoids the phenomenon that stud pops out accidentally and hurts surrounding workers, and the safety factor of the whole device is higher.

Description

Technical Field

[0001] This invention relates to the field of tire anti-skid stud installation machine technology, and more specifically, to a tire anti-skid stud installation machine with a protective mechanism. Background Technology

[0002] As we all know, ordinary car tires, motorcycle tires, and other vehicle tires are prone to slipping on icy and snowy roads due to reduced grip, making it impossible for vehicles to travel smoothly. To solve this problem, people typically use snow chains to attach to the tires. However, this method is inconvenient, significantly increases tire weight, and severely impacts vehicle speed. Currently, the best solution is to install studs on the tires. In practice, studs are installed manually.

[0003] To increase the speed of installing anti-skid studs on tire surfaces, stud installation machines have gradually replaced manual stud installation. However, existing stud installation machines have the following drawbacks:

[0004] Existing anti-skid studs have simple structures and usually require workers to manually support the tires close to the stud installation machine for installation. This exposed installation method is prone to the studs coming into contact with the tires and popping out, which can easily cause injury to workers and has a low safety factor. Therefore, there is an urgent need for an anti-skid stud installation machine with a protective structure to avoid the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a tire anti-skid stud installation machine with a protective mechanism to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A tire stud insertion machine with a protective mechanism includes a control box, a base, a top mount, and an electric screwdriver. The control box is mounted on the base, the top mount is movably mounted on the control box, and the electric screwdriver is mounted on the top mount. The insertion machine also includes:

[0008] The material conveying structure, mounted on the machine base, is used to transport tires;

[0009] A stud assembly, mounted on a top mount and connected to an electric screwdriver, is used to adjust the position of the electric screwdriver and to feed anti-slip studs to the electric screwdriver; and

[0010] The protective assembly, mounted on the base, is used to secure the tires and provide protection during the nailing process; among which...

[0011] The protective components include:

[0012] The fixed bases are arranged in a set and symmetrically on the machine base;

[0013] A protective cover is movably mounted on each of the aforementioned fixed seats;

[0014] The second electric telescopic mast is mounted on a fixed base, with its movable end connected to a protective cover; and

[0015] Clamping modules are provided on each of the fixed seats. The clamping modules are used to fix the position of the tire and drive the tire to move.

[0016] A further technical solution of this application: The transport structure includes a set of roller seats, a drive roller, a conveyor belt, and a No. 2 motor;

[0017] A set of roller seats are symmetrically arranged on the machine base. The number of drive rollers is several and they are symmetrically and movably arranged on the roller seats. The conveyor belt is connected between the drive rollers. The second motor is arranged on one of the roller seats and its output end is connected to the drive roller.

[0018] A further technical solution of this application: Each group of clamping modules includes:

[0019] A turntable is movably mounted on a protective cover, and the turntable is connected to a fixed base via a telescopic shaft;

[0020] The sliding seats are in several quantities. The turntable has several guide grooves arranged around it. The sliding seats are movably disposed in the guide grooves and are elastically connected to each other. One side of the sliding seat is connected to the guide groove by a cylinder.

[0021] A No. 1 motor is mounted on one of the fixed bases, and the output end of the No. 1 motor is connected to the telescopic shaft;

[0022] Clamping rods are provided on each of the sliding seats; and

[0023] The transmission unit, located between the clamping rod and the sliding seat and connected to the cylinder, is used to monitor the distance between the protective covers and control the extension and retraction of the cylinder.

[0024] A further technical solution of this application: the clamping rod is provided with a number of protrusions at equal intervals.

[0025] A further technical solution of this application: a plug is provided on the clamping rod on one side of the fixed base, and a slot is provided on the clamping rod on the other side of the fixed base, the slot being located on the moving path of the plug.

[0026] A further technical solution of this application: the transmission unit includes:

[0027] A piston is movably disposed within a cavity formed in a sliding seat and connected to it by an elastic element; a clamping rod is movably disposed on the sliding seat and one end is connected to the piston; and

[0028] The connecting pipe connects the cylinder and the cavity.

[0029] A further technical solution of this application: the electric screwdriver is movably disposed in a groove formed on the top seat, and the screw-insertion assembly includes:

[0030] The No. 1 electric telescopic rod is mounted on the top base and its movable end is connected to an electric screwdriver.

[0031] The fixed box is mounted on the top base; and

[0032] A nail box is movably mounted on a fixed box, and the nail box has through holes formed on it to mate with an electric screwdriver.

[0033] A further technical solution of this application: each of the protective covers is movably provided with a sliding cover and the two are elastically connected, the sliding cover is formed with a protruding mounting part, the mounting part is formed with a mounting port adapted to an electric screwdriver, and the fixed box is formed with a limiting part that cooperates with the mounting part.

[0034] A further technical solution of this application is: a monitoring unit is provided between the sliding cover and the protective cover, which is used to monitor the position of the sliding cover on the protective cover and feed back to the control box.

[0035] A further technical solution of this application: The monitoring unit includes a resistor strip and a conductive head, the resistor strip and the conductive head are respectively disposed on the protective cover and the sliding cover, the resistor strip is located on the moving path of the conductive head, and the resistor strip, the conductive head and the control box are electrically connected.

[0036] Compared with the prior art, the technical solution provided by the embodiments of the present invention has the following beneficial effects:

[0037] This invention, through the provision of protective components, utilizes a linked structure to not only place the protective cover in a sealed space for nailing, but also utilizes the mutual abutment between the clamping rods to activate the cylinder, causing the sliding seat and clamping rods to move towards the turntable, thereby clamping and fixing the tire. The entire device is highly automated, eliminating the traditional exposed anti-slip nailing method and adopting a sealed nailing operation, thus preventing the anti-slip nails from accidentally popping out and injuring surrounding personnel. The overall safety factor of the device is high. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the tire anti-skid stud installation machine with a protective mechanism in an embodiment of the present invention;

[0039] Figure 2 This is a top view of a tire anti-skid stud installation machine with a protective mechanism according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the protective component in the tire anti-skid stud installation machine with a protective mechanism according to an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the nail-setting assembly in a tire anti-skid nail-setting machine with a protective mechanism, as described in an embodiment of the present invention.

[0042] Figure 5 This is a schematic diagram of the clamping module in the tire anti-skid stud insertion machine with a protective mechanism in an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the transmission unit in the tire anti-skid stud installation machine with a protective mechanism in an embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the monitoring unit in the tire anti-skid stud installation machine with a protective mechanism in an embodiment of the present invention;

[0045] Figure 8 This is a top view of the nail-setting assembly in a tire anti-skid stud-setting machine with a protective mechanism, as described in an embodiment of the present invention.

[0046] Explanation of the labels in the diagram:

[0047] 1-Control box, 2-Base, 3-Top seat, 4-Electric screwdriver, 5-No. 1 electric telescopic rod, 6-Fixing box, 7-Nail box, 8-Protective cover, 9-No. 2 electric telescopic rod, 10-Sliding cover, 11-Conveying belt, 12-No. 1 motor, 13-No. 2 motor, 14-Roller seat, 15-Resistance strip, 16-Conductive head, 17-Plug, 18-Clamping rod, 19-Turntable, 20-Slot, 21-Protrusion, 22-Sliding seat, 23-Guide groove, 24-Cylinder, 25-Piston, 26-Spring, 27-Cavity, 28-Limiting part, 29-Through hole, 30-Slide groove, 31-Transmission roller, 32-Telescopic shaft, 33-Mounting port, 34-Connecting pipe. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention will be further described below with reference to the embodiments.

[0049] Please see Figures 1-8 In one embodiment of this application, a tire anti-skid stud insertion machine with a protective mechanism includes a control box 1, a base 2, a top seat 3, and an electric screwdriver 4. The control box 1 is mounted on the base 2, the top seat 3 is movably mounted on the control box 1, and the electric screwdriver 4 is mounted on the top seat 3. The insertion machine further includes:

[0050] The material conveying structure, mounted on the base 2, is used to transport tires;

[0051] A stud assembly, mounted on the top seat 3 and connected to the electric screwdriver 4, is used to adjust the position of the electric screwdriver 4 and to feed anti-slip studs to the electric screwdriver 4; and

[0052] The protective assembly, mounted on the base 2, is used to fix the tire's position and provide protection during the nailing process; among which...

[0053] The protective components include:

[0054] The fixed bases are arranged in a set and symmetrically on the machine base 2;

[0055] Protective cover 8, each of the fixed seats is movably provided with a protective cover 8;

[0056] The second electric telescopic rod 9 is mounted on a fixed base, and its movable end is connected to the protective cover 8; and

[0057] Clamping modules are provided on each of the fixed seats. The clamping modules are used to fix the position of the tire and drive the tire to move.

[0058] In this embodiment, the transport structure includes a set of roller seats 14, a drive roller 31, a conveyor belt 11, and a second motor 13.

[0059] A set of roller seats 14 are symmetrically arranged on the machine base 2. The number of transmission rollers 31 is several and they are symmetrically and movably arranged on the roller seats 14. The conveyor belt 11 is connected between the transmission rollers 31. The second motor 13 is arranged on one of the roller seats 14 and its output end is connected to the transmission roller 31.

[0060] It should be noted that the second motor 13 can be a stepper motor or a servo motor. In this embodiment, the second motor 13 is preferably a stepper motor. The specific model and parameters of the stepper motor can be selected according to the actual situation, and no specific limitation is made here.

[0061] In practical applications, the tire is placed on the conveyor belt 11. The control box 1 controls the second motor 13 to rotate, which drives the transmission roller 31 to rotate, thereby moving the conveyor belt 11. The tire follows the conveyor belt 11 and moves towards the protective cover 8. When the tire moves to the position between the protective covers 8, the control box 1 controls the second electric telescopic rod 9 to extend, thereby driving the protective cover 8 and the clamping module to move towards each other. The protective covers 8 fit tightly together, and the clamping module clamps and fixes the tire, so that the tire is in the sealed protective cover 8. Then, the nailing assembly is controlled to work, and the anti-slip nailing work is performed on the tire surface inside the protective cover 8. This eliminates the traditional method of directly exposing the tire for nailing and avoids the phenomenon of anti-slip nails accidentally popping out and injuring the workers when the nailing assembly is working.

[0062] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 as well as Figure 6 As another preferred embodiment of this application, each set of clamping modules includes:

[0063] Turntable 19 is movably mounted on protective cover 8, and turntable 19 is connected to fixed base via telescopic shaft 32;

[0064] There are several sliding seats 22. The turntable 19 has several guide grooves 23 arranged around it. The sliding seats 22 are movably disposed in the guide grooves 23 and are elastically connected to each other. One side of the sliding seat 22 and the guide groove 23 are connected by a cylinder 24.

[0065] A No. 1 motor 12 is provided on one of the fixed bases, and the output end of the No. 1 motor 12 is connected to the telescopic shaft 32.

[0066] Clamping rod 18, each of the sliding seats 22 is provided with a clamping rod 18; and

[0067] The transmission unit, located between the clamping rod 18 and the sliding seat 22 and connected to the cylinder 24, is used to monitor the distance between the protective covers 8 and control the extension and retraction of the cylinder 24.

[0068] In one specific embodiment, the clamping rod 18 is provided with a plurality of protrusions 21 at equal intervals.

[0069] In another specific embodiment, a plug 17 is provided on the clamping rod 18 on one side of the fixed base, and a slot 20 is provided on the clamping rod 18 on the other side of the fixed base, the slot 20 being located on the moving path of the plug 17.

[0070] It should be noted that the position of the sliding seat 22 is not limited to the cylinder 24 mentioned above. A linear motor or hydraulic cylinder can also be used instead, as long as the position of the sliding seat 22 can be adjusted. These will not be listed one by one here.

[0071] When the conveyor belt 11 transports the tire to the protective cover 8, the control box 1 can control the extension of the second electric telescopic rod 9, so that the protective cover 8 and the clamping rod 18 move towards each other. At this time, the plug 17 is inserted into the slot 20, and the clamping rod 18 is located inside the tire. During this process, the transmission unit can be controlled to extend the cylinder 24, which drives the sliding seat 22 and the clamping rod 18 to move outward of the turntable 19, thereby clamping and fixing the tire. By setting the protrusion 21, the clamping and fixing effect of the tire can be improved, and the axial direction of the tire can be restricted. Then, by controlling the first motor 12 to rotate, the telescopic shaft 32 and the turntable 19 can be driven to rotate, thereby controlling the clamping rod 18 and the tire to rotate, so that anti-slip studs can be inserted at all positions of the tire without the need for the operator to manually rotate the tire.

[0072] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 as well as Figure 6 In another preferred embodiment of this application, the transmission unit includes:

[0073] Piston 25 is movably disposed within a cavity 27 formed in a sliding seat 22 and connected to it by an elastic element; clamping rod 18 is movably disposed on the sliding seat 22 and one end is connected to piston 25; and

[0074] Connecting pipe 34 connects between cylinder 24 and cavity 27.

[0075] It should be noted that the elastic element can be a spring 26, a spring sheet, or an elastic steel plate structure. In this embodiment, the elastic element is preferably a spring 26, which is connected between the piston 25 and the cavity 27. The specific model parameters of the spring 26 can be optimally selected according to the actual situation, and are not specifically limited here.

[0076] When the second electric telescopic rod 9 is extended, the protective covers 8 are brought closer together. At this time, the plug 17 is inserted into the slot 20 and the two opposing clamping rods 18 abut against each other, thereby driving the clamping rods 18 to move relative to the sliding seat 22. This causes the piston 25 to reciprocate along the cavity 27, thereby squeezing the air in the cavity 27 into the cylinder 24, causing the cylinder 24 to extend and thus controlling the sliding seat 22 to move along the guide groove 23, thereby realizing the clamping and fixing of the tire by the clamping rods 18.

[0077] Please see Figures 1-8 In another preferred embodiment of this application, the electric screwdriver 4 is movably disposed within a groove 30 formed on the top seat 3, and the insert assembly includes:

[0078] The first electric telescopic rod 5 is mounted on the top seat 3 and its movable end is connected to the electric screwdriver 4.

[0079] Fixed box 6, mounted on top seat 3; and

[0080] The nail box 7 is movably mounted on the fixed box 6, and the nail box 7 has a through hole 29 formed on it to cooperate with the electric screwdriver 4.

[0081] In one specific embodiment, each of the protective covers 8 is movably provided with a sliding cover 10 and the two are elastically connected. The sliding cover 10 is formed with a protruding mounting part, and the mounting part is formed with a mounting port 33 adapted to the electric screwdriver 4. The fixed box 6 is formed with a limiting part 28 that cooperates with the mounting part.

[0082] In another specific case of this embodiment, a monitoring unit is provided between the sliding cover 10 and the protective cover 8 to monitor the position of the sliding cover 10 on the protective cover 8 and provide feedback to the control box 1.

[0083] It should be further explained that the monitoring unit includes a resistor strip 15 and a conductive head 16. The resistor strip 15 and the conductive head 16 are respectively installed on the protective cover 8 and the sliding cover 10. The resistor strip 15 is located on the moving path of the conductive head 16. The resistor strip 15, the conductive head 16 and the control box 1 are electrically connected.

[0084] It should be noted that this embodiment is not limited to the monitoring unit described above for monitoring the position of the sliding cover 10 on the protective cover 8. Infrared ranging sensors or laser ranging sensors can also be used instead, as long as they can achieve real-time monitoring of the position of the sliding cover 10 and the protective cover 8. They will not be listed one by one here.

[0085] During the process of clamping and fixing the tire using the clamping rod 18, the top seat 3 is moved down by the control box 1, allowing the electric screwdriver 4 to be inserted into the protective cover 8 through the mounting port 33. At this time, the mounting part can be clamped by the limiting part 28. By controlling the first electric telescopic rod 5 to extend and retract continuously, the electric screwdriver 4 can be driven to reciprocate in the horizontal direction. At the same time, the first motor 12 is energized and rotates, causing the tire to rotate, so that nails can be inserted at different positions on the tire. During this process, the nail box 7 can be controlled to move relative to the fixing box 6 and cooperate with the electric screwdriver 4 to supplement the anti-slip nails. While the first electric telescopic rod 5 controls the electric screwdriver 4 to reciprocate and moves the sliding cover 10, the conductive head 16 and the resistor strip 15 can contact different positions. The resistance value fed back to the control box 1 by the resistor strip 15 allows the staff to monitor the nailing progress of the anti-slip nails in the protective cover 8 in real time.

[0086] How this application works:

[0087] The tire is placed on the conveyor belt 11. The control box 1 controls the second motor 13 to rotate, which drives the transmission roller 31 to rotate, thereby moving the conveyor belt 11. The tire follows the conveyor belt 11 and moves towards the protective cover 8. When the tire moves to the position between the protective covers 8, the control box 1 controls the second electric telescopic rod 9 to extend, so that the protective cover 8 and the clamping rod 18 move towards each other. At this time, the plug 17 is inserted into the slot 20, and the clamping rod 18 is located inside the tire. During this process, the plug 17 is inserted into the slot 20 and the two opposing clamping rods 18 abut against each other, thereby driving the clamping rod 18 to move relative to the sliding seat 22. This drives the piston 25 to reciprocate along the cavity 27, thereby squeezing the air in the cavity 27 into the cylinder 24, causing the cylinder 24 to extend, thereby controlling the sliding seat 22 to move along the guide groove 23, realizing the clamping and fixing of the tire by the clamping rod 18. By setting the protrusion 21, the clamping and fixing effect of the tire can be improved, and the axial direction of the tire can be restricted. Then, by controlling the first motor 12 to rotate, the telescopic shaft 32 and the turntable 19 can be driven to rotate, thereby controlling the clamping rod 18 and the tire to rotate, so that anti-skid studs can be inserted at all positions of the tire without the need for the staff to manually rotate the tire. During the process of clamping and fixing the tire using the clamping rod 18, the top seat 3 is moved down by the control box 1, allowing the electric screwdriver 4 to be inserted into the protective cover 8 through the mounting port 33. At this time, the mounting part can be clamped by the limiting part 28. By controlling the first electric telescopic rod 5 to extend and retract continuously, the electric screwdriver 4 can be driven to reciprocate in the horizontal direction. At the same time, the first motor 12 is energized and rotates, causing the tire to rotate, so that nails can be inserted at different positions on the tire. During this process, the nail box 7 can be controlled to move relative to the fixing box 6 and cooperate with the electric screwdriver 4 to supplement the anti-slip nails. While the first electric telescopic rod 5 controls the electric screwdriver 4 to reciprocate and moves the sliding cover 10, the conductive head 16 and the resistor strip 15 can contact different positions. The resistance value fed back to the control box 1 by the resistor strip 15 allows the staff to monitor the nailing progress of the anti-slip nails in the protective cover 8 in real time.

[0088] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

[0089] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tire anti-skid stud installation machine with a protective mechanism, comprising a control box, a base, a top mount, and an electric screwdriver, wherein the control box is mounted on the base, the top mount is movably mounted on the control box, and the electric screwdriver is mounted on the top mount, characterized in that, The nail-setting machine also includes: The material conveying structure, mounted on the machine base, is used to transport tires; A stud assembly, mounted on a top mount and connected to an electric screwdriver, is used to adjust the position of the electric screwdriver and to feed anti-slip studs to the electric screwdriver; and The protective assembly, mounted on the base, is used to secure the tires and provide protection during the nailing process; among which... The protective components include: The fixed bases are arranged in a set and symmetrically on the machine base; A protective cover is movably mounted on each of the aforementioned fixed seats; The second electric telescopic mast is mounted on a fixed base, with its movable end connected to a protective cover; and... Clamping modules are provided on each of the fixed seats. The clamping modules are used to fix the position of the tire and drive the tire to move. Each set of clamping modules includes: A turntable is movably mounted on a protective cover, and the turntable is connected to a fixed base via a telescopic shaft; The sliding seats are in several quantities. The turntable has several guide grooves arranged around it. The sliding seats are movably disposed in the guide grooves and are elastically connected to each other. One side of the sliding seat is connected to the guide groove by a cylinder. A No. 1 motor is mounted on one of the fixed bases, and the output end of the No. 1 motor is connected to the telescopic shaft; Clamping rods are provided on each of the sliding seats; and, The transmission unit, located between the clamping rod and the sliding seat and connected to the cylinder, is used to monitor the distance between the protective covers and control the extension and retraction of the cylinder.

2. The tire anti-skid stud insertion machine with a protective mechanism according to claim 1, characterized in that, The material conveying structure includes a set of roller seats, drive rollers, a conveying belt, and a No. 2 motor; A set of roller seats are symmetrically arranged on the machine base. The number of drive rollers is several and they are symmetrically and movably arranged on the roller seats. The conveyor belt is connected between the drive rollers. The second motor is arranged on one of the roller seats and its output end is connected to the drive roller.

3. The tire anti-skid stud insertion machine with a protective mechanism according to claim 1, characterized in that, The clamping rod has several protrusions evenly spaced on it.

4. The tire anti-skid stud insertion machine with a protective mechanism according to claim 1, characterized in that, A plug is provided on the clamping rod on one side of the fixed base, and a slot is provided on the clamping rod on the other side of the fixed base, the slot being located on the moving path of the plug.

5. The tire anti-skid stud insertion machine with a protective mechanism according to claim 4, characterized in that, The transmission unit includes: A piston is movably disposed within a cavity formed in a sliding seat and connected to it by an elastic element; a clamping rod is movably disposed on the sliding seat and one end is connected to the piston; and The connecting pipe connects the cylinder and the cavity.

6. The tire anti-skid stud installation machine with a protective mechanism according to claim 1, characterized in that, The electric screwdriver is movably mounted in a groove formed on the top seat, and the screw-in assembly includes: The No. 1 electric telescopic rod is mounted on the top base and its movable end is connected to an electric screwdriver. The fixed box is mounted on the top base; and, A nail box is movably mounted on a fixed box, and the nail box has through holes formed on it to mate with an electric screwdriver.

7. The tire anti-skid stud insertion machine with a protective mechanism according to claim 6, characterized in that, Each of the protective covers is movably provided with a sliding cover and the two are elastically connected. The sliding cover is formed with a protruding mounting part, the mounting part is formed with a mounting port adapted to an electric screwdriver, and the fixed box is formed with a limiting part that cooperates with the mounting part.

8. The tire anti-skid stud insertion machine with a protective mechanism according to claim 7, characterized in that, A monitoring unit is provided between the sliding cover and the protective cover to monitor the position of the sliding cover on the protective cover and provide feedback to the control box.

9. The tire anti-skid stud insertion machine with a protective mechanism according to claim 8, characterized in that, The monitoring unit includes a resistor strip and a conductive head, which are respectively mounted on a protective cover and a sliding cover. The resistor strip is located on the moving path of the conductive head, and the resistor strip, conductive head, and control box are electrically connected.

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