Cable recovery device

By designing a cable recovery device including a workbench, a fixing frame and a wire stripping mechanism, the problems of low recycling efficiency and long manual recovery of small and medium-sized cables in the prior art are solved, and efficient, precise cutting and processing of the cables are achieved.

CN222546030UActive Publication Date: 2025-02-28GUANGDONG DONGHUI ELECTRIC POWER CO LTD
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Patent Information

Application Number
CN202421655681.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-15
Publication Date
2025-02-28
Estimated Expiration
2034-07-15

AI Technical Summary

Technical Problem

The existing cable recycling device has high starting and running costs when processing small amounts of cables, is not good, and manual recycling takes a long time, workload, and consumes a lot of human resources.

Method used

A cable recycling device is designed, including a workbench, a fixing frame and a wire stripping mechanism. By adjusting the height of the sliding block, the position of the auxiliary roller can be achieved to achieve stable control and precise cutting of the cable. At the same time, the guidance of the pull-out assembly is used to speed up the cutting and processing of the cable.

Benefits of technology

It improves the efficiency and accuracy of cable cutting, reduces waste and defective rates, reduces the operation difficulty of staff, and improves work efficiency, ensuring the accuracy and safety of cable processing.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a cable recovery device, and relates to the cable recovery technology field, the cable recovery device comprises a work bench, a fixing frame and a wire stripping mechanism, the fixing frame is fixedly installed at one end of the upper surface of the work bench, the top end of the fixing frame is symmetrically and fixedly provided with two slide bars, the top ends of the two slide bars are provided with screw rods, and the screw rods are connected with the wire stripping mechanism. The two ends of the lead screw are rotationally connected with the two ends of the top of the fixing frame, and one end of the lead screw penetrates through the side wall of the fixing frame and is fixedly provided with a hand wheel. The position of the auxiliary roller is changed by adjusting the height of the sliding block so that stable control and accurate cutting of a cable can be achieved, the cable can be limited through the arrangement of the auxiliary roller, in addition, the cable can be stably inserted into the cutting part at the top end of the fixing base, the cable cutting process is more accurate, and the cutting efficiency is improved. The waste and the defective rate are reduced, so that a worker can quickly remove the outer skin of the cable to expose the internal wire, and the subsequent stripping work is facilitated.
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Description

Technical Field

[0001] The utility model relates to the technical field of cable recovery, in particular to a cable recovery device. Background Art

[0002] A cable is a wire that is made of one or more insulated conductors and an outer insulating protective layer to transmit electricity or information from one place to another.

[0003] Cables have the characteristics of being powered inside and insulated outside. They have a relatively complex structure. Products with a large cross-sectional area are usually called cables. Cables are an important electrical equipment used to transmit electrical energy or signals. They play a vital role in modern society.

[0004] The recycling of waste cables is of great significance for resource reuse and environmental protection. Waste cables are rich in metal materials, such as copper and aluminum, as well as recyclable plastic materials.

[0005] Through special recycling processes, these materials can be effectively reused, greatly reducing the waste of resources and avoiding potential pollution to the environment caused by these materials.

[0006] However, in the current cable recycling process, when faced with the task of recycling small piles of cables, starting large-scale recycling equipment is cumbersome and inefficient. Although large-scale equipment can efficiently process a large number of cables, its startup and operating costs are relatively high when processing a small amount of cables, and the benefits are not good.

[0007] On the other hand, if manual recycling is adopted, although it is feasible, the recycling process is time-consuming, labor-intensive, and consumes a lot of human resources.

[0008] Therefore, it is necessary to provide a cable recovery device to solve the above technical problems. Utility Model Content

[0009] The purpose of the utility model is to provide a cable recovery device to solve the problems raised in the above background technology.

[0010] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0011] The cam is secured to the upper and lower ends of the cam, and the cam is secured to the upper and lower ends of the cam.

[0012] A further improvement of the technical solution of the utility model is that in the current cable recycling process, when faced with the task of recycling a small pile of cables, starting a large-scale recycling device is relatively cumbersome and inefficient. Although large-scale equipment can efficiently process a large number of cables, when processing a small amount of cables, its startup and operation costs are relatively high and the benefits are not good. On the other hand, if manual recycling is adopted, although it is feasible, the recycling process is time-consuming, the workload is large, and the consumption of human resources is also large. When the cables need to be recycled, at this time, the cables to be recycled are inserted into the stripping mechanism, and the screw rod is driven to rotate by turning the hand wheel, so that the distance between the two sliding frames can be adjusted, which can facilitate the staff to slide the cables from the two sliding frames. The cable passes between the racks, and then the position of the cable is restricted by the wire stripping mechanism, so that the lower surface of the cable is inserted into the cutting part at the top of the fixed seat. After that, the cable is pulled, and the cable can be cut by the cutting part at the top of the fixed seat, so that it is convenient for the staff to strip the cable, and the position of the auxiliary roller is changed by adjusting the height of the sliding block to achieve stable control and precise cutting of the cable. The cable can be restricted by the setting of the auxiliary roller. In addition, the cable can be stably inserted into the cutting part at the top of the fixed seat, which makes the cable cutting process more accurate, reduces waste and defective rate, and allows the staff to quickly remove the outer skin of the cable to expose the internal wires, which is convenient for subsequent stripping work.

[0013] The above technical solution is adopted, in which a base frame is fixedly installed at the bottom end of the workbench.

[0014] A further improvement of the technical solution of the utility model is that the base frame is fixedly installed at the bottom end of the workbench, which has the advantages of high stability, strong load-bearing capacity, strong adaptability, solid structure and space saving.

[0015] The above-mentioned technical scheme is adopted, and the wire stripping mechanism in the scheme also includes a sliding groove, two of the sliding grooves are opened at the top of the sliding frame, and sliding blocks are slidably connected in the sliding grooves at the top of the two sliding frames, and the two sliding blocks are respectively slidably connected to the two ends of the mounting rod, and an auxiliary roller is rotatably installed in the center of the mounting rod, and the top of the two sliding frames is threadedly connected with a threaded rod, and one end of the two threaded rods is rotatably connected to the top of the sliding block, and a rotating ring is fixedly installed on the end of the two threaded rods away from the sliding block.

[0016] A further improvement of the technical solution of the utility model is that when the cable passes between the two sliding frames, in order to ensure that the cable can enter the cutting process stably and accurately, at this time, the staff drives the threaded rod to rotate by a rotating ring, thereby adjusting the height of the two sliding blocks, and an auxiliary roller is installed in the middle of the mounting rod between the two sliding blocks. As the height of the sliding block is adjusted, the height of the auxiliary roller is adjusted, and the cable can be pressed down, so that the lower surface of the cable is inserted into the cutting part at the top of the fixed seat. The setting of the auxiliary roller not only provides precise restriction on the position of the cable, but also ensures the stability of the cable during the cutting process. Once the cable is stably inserted into the cutting part, the staff can start the cutting process by pulling the cable, which improves the efficiency and accuracy of cable cutting and reduces the difficulty of operation for the staff.

[0017] The above technical solution is adopted, in which limiting blocks are fixedly installed on both sides of the sliding block, and limiting grooves that slide with the limiting blocks are opened on both sides of the sliding groove.

[0018] A further improvement of the technical solution of the utility model is that the limiting blocks on both sides of the sliding block can cooperate with the limiting grooves on both sides of the sliding groove to increase the sliding fit between the sliding block and the sliding frame, thereby increasing the sliding stability of the device.

[0019] The above-mentioned technical scheme is adopted, in which a wire pulling assembly is provided on one side of the wire stripping assembly, and the wire pulling assembly is fixedly installed on the upper surface of the workbench away from one end of the wire stripping assembly, and the wire pulling assembly includes a vertical plate, and the two vertical plates are symmetrically fixedly installed on the upper surface of the workbench, and the middle parts of the two vertical plates are rotatably connected with an active roller, and a motor is fixedly installed on one side of one of the vertical plates, and the output end of the motor is fixedly connected to one end of the active roller, and the tops of the two vertical plates are provided with installation grooves, and the installation grooves inside the tops of the two vertical plates are slidably connected, and a matching roller is rotatably connected between the two installation blocks, and the tops of the two installation blocks are provided with auxiliary springs, and the auxiliary springs are arranged inside the active roller at the tops of the vertical plates.

[0020] A further improvement of the technical solution of the utility model is that: after the cable passes through the wire stripping assembly, the staff will pass the cut cable between the active roller and the matching roller in the wire pulling assembly, and the two ends of the matching roller are rotatably connected to the mounting block, and the mounting block is pressed downward by an auxiliary spring. When the cable passes between the active roller and the matching roller, due to the elastic force of the auxiliary spring, the matching roller will be close to the active roller, thereby effectively clamping the cable. Once the cable is clamped, the active roller will start to rotate slowly under the drive of the motor. Due to the clamping effect between the matching roller and the active roller, the cable will move forward with the rotation of the active roller. The setting of the wire pulling assembly enables the cable to be continuously pulled out of the wire stripping assembly. Through the guidance of the wire pulling assembly, the cutting and processing speed of the cable is effectively accelerated. The entire operation process not only improves the work efficiency, but also ensures the accuracy and safety of cable processing.

[0021] The above technical solution is adopted, and the outer surfaces of the auxiliary roller, the active roller and the matching roller in the solution are all provided with anti-slip grooves.

[0022] A further improvement of the technical solution of the utility model is that the anti-skid patterns on the outer surfaces of the auxiliary roller, the active roller and the matching roller can increase the friction between the three and the cable, effectively preventing the cable from sliding and skidding, and improving the stability of the device during operation.

[0023] The above technical solution is adopted, in which a protrusion which cooperates with the auxiliary spring is arranged on the top of the mounting block.

[0024] A further improvement of the technical solution of the utility model is that the setting of the protrusion on the top of the mounting block can increase the installation stability of the auxiliary spring.

[0025] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0026] 1. The utility model provides a cable recovery device, which can achieve stable control and precise cutting of the cable by adjusting the height of the sliding block and then changing the position of the auxiliary roller. The cable can be restricted by the setting of the auxiliary roller. In addition, the cable can be stably inserted into the cutting part at the top of the fixed seat, making the cable cutting process more accurate, reducing waste and defective rate, and allowing the staff to quickly remove the outer skin of the cable to expose the internal wires, which is convenient for subsequent stripping work.

[0027] 2. The utility model provides a cable recovery device, which effectively speeds up the cutting and processing of cables through the guidance of the wire pulling assembly. The entire operation process not only improves work efficiency, but also ensures the accuracy and safety of cable processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 This is a structural schematic diagram of the overall device of the utility model from a first viewing angle;

[0030] Figure 2 This is a schematic structural diagram of the overall device of the utility model from a second viewing angle;

[0031] Figure 3 This is a structural schematic diagram of the wire stripping assembly of the utility model from the first perspective;

[0032] Figure 4 This is a structural schematic diagram of the wire stripping assembly of the utility model from a second viewing angle;

[0033] Figure 5 This is a schematic structural diagram of the wire stripping assembly of the utility model from a third viewing angle;

[0034] Figure 6 It is a structural schematic diagram of the wire pulling assembly of the utility model;

[0035] In the figure: 1. workbench; 2. base frame; 3. fixed frame; 4. sliding rod; 5. screw rod; 6. hand wheel; 7. fixed seat; 8. sliding frame; 9. sliding groove; 10. sliding block; 11. limiting block; 12. limiting groove; 13. mounting rod; 14. auxiliary roller; 15. threaded rod; 16. rotating ring; 17. vertical plate; 18. active roller; 19. motor; 20. mounting groove; 21. mounting block; 22. matching roller; 23. auxiliary spring. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the embodiments:

[0037] Example 1

[0038] like Figure 1-6 As shown, the utility model provides a cable recovery device, including a workbench 1, a fixed frame 3 and a wire stripping mechanism. The fixed frame 3 is fixedly installed at one end of the upper surface of the workbench 1, and two sliding rods 4 are symmetrically fixedly installed on the top of the fixed frame 3. The tops of the two sliding rods 4 are provided with screw rods 5, and the two ends of the screw rods 5 are rotatably connected to the two ends of the top of the fixed frame 3. One end of the screw rod 5 passes through the side wall of the fixed frame 3 and is fixedly installed with a hand wheel 6. The wire stripping mechanism is threadedly connected to the screw rod 5, and the bottom end of the wire stripping mechanism is slidably connected to the two sliding rods 4. The wire stripping mechanism includes a fixed seat 7, which is fixedly installed at the center of the upper surface of the fixed frame 3. Two sliding frames 8 are symmetrically provided on both sides of the fixed seat 7. The bottom ends of the two sliding frames 8 are threadedly connected to the screw rod 5, and the bottom ends of the two sliding frames 8 are slidably connected to the sliding rod 4.

[0039] In this embodiment, when the cable needs to be recycled, at this time, the cable to be recycled is inserted into the stripping mechanism, and the screw rod 5 is driven to rotate by turning the hand wheel 6, so that the distance between the two sliding frames 8 can be adjusted, which can facilitate the staff to pass the cable through the two sliding frames 8, and then the position of the cable is limited by the stripping mechanism, so that the lower surface of the cable is inserted into the cutting part at the top of the fixed seat 7. After that, the cable is pulled, and the cable can be cut by the cutting part at the top of the fixed seat 7, so that it is convenient for the staff to strip the cable, and the height of the sliding block 10 is adjusted to change the position of the auxiliary roller 14 to achieve stable control and precise cutting of the cable. The cable can be restricted by the setting of the auxiliary roller 14. In addition, the cable can be stably inserted into the cutting part at the top of the fixed seat 7, making the cable cutting process more accurate, reducing waste and defective rate, and allowing the staff to quickly remove the outer skin of the cable to expose the internal wires, which is convenient for subsequent stripping work.

[0040] Example 2

[0041] like Figure 1 and Figure 2 As shown, based on Example 1, the utility model provides a technical solution: preferably, a base frame 2 is fixedly installed on the bottom end of the workbench 1.

[0042] In this embodiment, the base frame 2 is fixedly installed at the bottom end of the workbench 1, and has the advantages of high stability, strong load-bearing capacity, strong adaptability, solid structure and space saving.

[0043] like Figure 3-5 As shown, preferably, the wire stripping mechanism also includes a sliding groove 9, two sliding grooves 9 are opened at the top of the sliding frame 8, and a sliding block 10 is slidably connected in the sliding grooves 9 at the top of the two sliding frames 8. The two sliding blocks 10 are respectively slidably connected to the two ends of the mounting rod 13, and an auxiliary roller 14 is rotatably installed in the center of the mounting rod 13. The top of the two sliding frames 8 is threadedly connected with a threaded rod 15, and one end of the two threaded rods 15 is rotatably connected to the top of the sliding block 10, and a rotating ring 16 is fixedly installed at one end of the two threaded rods 15 away from the sliding block 10.

[0044] In this embodiment, when the cable passes between the two sliding frames 8, in order to ensure that the cable can enter the cutting process stably and accurately, at this time, the staff drives the threaded rod 15 to rotate by rotating the ring 16, and then adjusts the height of the two sliding blocks 10, and an auxiliary roller 14 is installed in the middle of the mounting rod 13 between the two sliding blocks 10. As the height of the sliding block 10 is adjusted, the height of the auxiliary roller 14 is adjusted, and the cable can be pressed down, so that the lower surface of the cable is inserted into the cutting part at the top of the fixed seat 7. The setting of the auxiliary roller 14 not only provides precise restriction on the position of the cable, but also ensures the stability of the cable during the cutting process. Once the cable is stably inserted into the cutting part, the staff can start the cutting process by pulling the cable, which improves the efficiency and accuracy of cable cutting, and also reduces the difficulty of operation for the staff.

[0045] like Figure 5 As shown, preferably, limiting blocks 11 are fixedly installed on both sides of the sliding block 10 , and limiting grooves 12 that slide with the limiting blocks 11 are opened on both sides of the sliding groove 9 .

[0046] The limiting blocks 11 on both sides of the sliding block 10 can cooperate with the limiting grooves 12 on both sides of the sliding groove 9 to increase the sliding fit between the sliding block 10 and the sliding frame 8, thereby increasing the sliding stability of the device.

[0047] Example 3

[0048] like Figure 6 As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, a wire pulling assembly is provided on one side of the wire stripping assembly, and the wire pulling assembly is fixedly mounted on the upper surface of the workbench 1 at one end away from the wire stripping assembly, the wire pulling assembly includes a vertical plate 17, two vertical plates 17 are symmetrically fixedly mounted on the upper surface of the workbench 1, and an active roller 18 is rotatably connected to the middle part of the two vertical plates 17, a motor 19 is fixedly mounted on one side of one of the vertical plates 17, and the output end of the motor 19 is fixedly connected to one end of the active roller 18, a mounting groove 20 is opened at the top of the two vertical plates 17, a mounting block 21 is slidably connected in the mounting groove 20 inside the top of the two vertical plates 17, a matching roller 22 is rotatably connected between the two mounting blocks 21, and an auxiliary spring 23 is provided at the top of the two mounting blocks 21, and the auxiliary spring 23 is arranged inside the active roller 18 at the top of the vertical plate 17.

[0049] In this embodiment, after the cable passes through the wire stripping assembly, the staff will pass the cut cable between the active roller 18 and the mating roller 22 in the wire pulling assembly, and the two ends of the mating roller 22 are rotatably connected to the mounting block 21, and the mounting block 21 is pressed downward by the auxiliary spring 23. When the cable passes between the active roller 18 and the mating roller 22, due to the elastic force of the auxiliary spring, the mating roller 22 will be close to the active roller 18, thereby effectively clamping the cable. Once the cable is clamped, the active roller 18 will start to rotate slowly under the drive of the motor 19. Due to the clamping effect between the mating roller 22 and the active roller 18, the cable will move forward with the rotation of the active roller 18. The setting of the wire pulling assembly enables the cable to be continuously pulled out of the wire stripping assembly. Through the guidance of the wire pulling assembly, the cutting and processing speed of the cable is effectively accelerated. The entire operation process not only improves work efficiency, but also ensures the accuracy and safety of cable processing.

[0050] Example 4

[0051] like Figure 1-6 As shown, based on Example 1, the utility model provides a technical solution: preferably, the outer surfaces of the auxiliary roller 14, the active roller 18 and the matching roller 22 are all provided with anti-slip grooves.

[0052] In this embodiment, the anti-skid patterns on the outer surfaces of the auxiliary roller 14, the active roller 18 and the matching roller 22 can increase the friction between the three and the cable, effectively preventing the cable from sliding and skidding, and improving the stability of the device during operation.

[0053] like Figure 6 As shown, preferably, a protrusion which is mounted and matched with the auxiliary spring 23 is provided at the top end of the mounting block 21 .

[0054] In this embodiment, the protrusion disposed on the top of the mounting block 21 can increase the installation stability of the auxiliary spring 23 .

[0055] The working principle of the cable recovery device is described in detail below.

[0056] like Figure 1-6 As shown, the cable to be recycled is inserted into the wire stripping mechanism, and the screw rod 5 is driven to rotate by turning the hand wheel 6, so that the distance between the two sliding frames 8 is adjusted, which can facilitate the staff to pass the cable between the two sliding frames 8.

[0057] When the cable passes between the two sliding frames 8, in order to ensure that the cable can enter the cutting process stably and accurately, at this time, the staff drives the threaded rod 15 to rotate by rotating the ring 16, thereby adjusting the height of the two sliding blocks 10.

[0058] An auxiliary roller 14 is installed in the middle of the mounting rod 13 between the two sliding blocks 10. As the height of the sliding block 10 is adjusted, the height of the auxiliary roller 14 is adjusted, and the cable can be pressed down, so that the lower surface of the cable is inserted into the cutting portion at the top of the fixing seat 7.

[0059] After the cable passes through the stripping assembly, the staff will pass the cut cable between the active roller 18 and the matching roller 22 in the wire pulling assembly, and the two ends of the matching roller 22 are rotatably connected with the mounting block 21.

[0060] The mounting block 21 is pressed downward by the auxiliary spring 23. When the cable passes between the active roller 18 and the matching roller 22, the matching roller 22 will be pressed against the active roller 18 due to the elastic force of the auxiliary spring, thereby effectively clamping the cable.

[0061] Once the cable is clamped, the active roller 18 will start to rotate slowly under the drive of the motor 19. Due to the clamping effect between the matching roller 22 and the active roller 18, the cable will move forward with the rotation of the active roller 18. The setting of the wire pulling assembly allows the cable to be continuously pulled out of the wire stripping assembly.

[0062] Through the guidance of the wire pulling assembly, the cutting and processing speed of the cable is effectively accelerated. The entire operation process not only improves work efficiency, but also ensures the accuracy and safety of cable processing.

[0063] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A cable recovery device, characterized in that: include: Workbench (1); A fixed frame (3), the fixed frame (3) is fixedly mounted on one end of the upper surface of the workbench (1), two sliding rods (4) are symmetrically fixedly mounted on the top of the fixed frame (3), a screw rod (5) is provided on the top of the two sliding rods (4), and the two ends of the screw rod (5) are rotatably connected to the two ends of the top of the fixed frame (3), and one end of the screw rod (5) passes through the side wall of the fixed frame (3) and is fixedly mounted with a hand wheel (6); A wire stripping mechanism, wherein the wire stripping mechanism is threadedly connected to the screw rod (5), and the bottom end of the wire stripping mechanism is slidably connected to the two sliding rods (4), the wire stripping mechanism comprises a fixed seat (7), the fixed seat (7) is fixedly installed at the center of the upper surface of the fixed frame (3), two sliding frames (8) are symmetrically arranged on both sides of the fixed seat (7), the bottom ends of the two sliding frames (8) are both threadedly connected to the screw rod (5), and the bottom ends of the two sliding frames (8) are slidably connected to the sliding rods (4).

2. A cable recovery device according to claim 1, characterized in that: A base frame (2) is fixedly mounted on the bottom end of the workbench (1).

3. A cable recovery device according to claim 2, characterized in that: The wire stripping mechanism also includes a sliding groove (9), two of the sliding grooves (9) are opened at the top of the sliding frame (8), and a sliding block (10) is slidably connected in the sliding grooves (9) at the top of the two sliding frames (8), and the two sliding blocks (10) are respectively slidably connected to the two ends of the mounting rod (13), and an auxiliary roller (14) is rotatably installed at the center of the mounting rod (13), and the top of the two sliding frames (8) is threadedly connected with a threaded rod (15), and one end of the two threaded rods (15) is rotatably connected to the top of the sliding block (10), and a rotating ring (16) is fixedly installed at one end of the two threaded rods (15) away from the sliding block (10).

4. A cable recovery device according to claim 3, characterized in that: Limiting blocks (11) are fixedly mounted on both sides of the sliding block (10), and limiting grooves (12) for slidingly cooperating with the limiting blocks (11) are provided on both sides of the interior of the sliding groove (9).

5. A cable recovery device according to claim 4, characterized in that: A wire pulling assembly is provided on one side of the wire stripping mechanism, and the wire pulling assembly is fixedly mounted on the upper surface of the workbench (1) at one end away from the wire stripping mechanism. The wire pulling assembly comprises a vertical plate (17), and two vertical plates (17) are symmetrically fixedly mounted on the upper surface of the workbench (1). An active roller (18) is rotatably connected to the middle of the two vertical plates (17). A motor (19) is fixedly mounted on one side of one of the vertical plates (17), and the output end of the motor (19) is fixedly connected to one end of the active roller (18). A mounting groove (20) is provided at the top of the two vertical plates (17), and a mounting block (21) is slidably connected in the mounting groove (20) inside the top of the two vertical plates (17). A matching roller (22) is rotatably connected between the two mounting blocks (21). Auxiliary springs (23) are provided at the top of the two mounting blocks (21), and the auxiliary spring (23) is arranged inside the active roller (18) at the top of the vertical plate (17).

6. A cable recovery device according to claim 5, characterized in that: The outer surfaces of the auxiliary roller (14), the active roller (18) and the matching roller (22) are all provided with anti-slip grooves.

7. A cable recovery device according to claim 6, characterized in that: The top end of the mounting block (21) is provided with a protrusion which is mounted and matched with the auxiliary spring (23).