A wire and cable length measuring device

By using limiting components and silicone wheel sleeves, the problems of slippage and deviation during cable transmission are solved, achieving stability and accuracy in cable length measurement, and improving the precision and ease of maintenance of the metering device.

CN224499451UActive Publication Date: 2026-07-14NANJING ANDA WIRE CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
NANJING ANDA WIRE CO LTD
Filing Date
2025-09-10
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In existing wire and cable length measuring devices, cable transmission is prone to slippage and deviation, leading to inaccurate measurement and failing to meet the requirements for high precision.

Method used

It adopts a limiting component and silicone wheel sleeve structure. The motor drives the conveyor wheel and positioning roller to limit the cable. Combined with the silicone pressure roller to increase friction, it ensures stable cable transmission. The fixing component realizes the stable connection and convenient replacement of the silicone wheel sleeve.

Benefits of technology

It has achieved stable cable transmission and accurate metering, improved the accuracy and maintenance efficiency of metering devices, and solved the problems of slippage and deviation during cable transmission.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The application relates to a wire and cable length metering device, and relates to the technical field of wire and cable length metering. The device comprises a bottom plate, the side wall of the bottom plate is fixedly connected with a side plate, a conveying wheel is rotationally connected in the side plate, a metering wheel is rotationally connected in the side plate, a silica gel wheel sleeve is arranged on the side wall of the metering wheel, a digital display meter is arranged on the top of the side plate, a limiting assembly is arranged on the side wall of the side plate, and a fixing assembly is arranged in the metering wheel; the limiting assembly comprises a fixing sleeve and a positioning roller, the side wall of the fixing sleeve is fixedly connected with the side wall of the side plate, and the side wall of the positioning roller is slidingly connected in the fixing sleeve. In the utility model, the conveying wheel is driven by a motor to transmit and cooperate with a cylinder to drive a silica gel press roller to compress the cable at an angle of 45 DEG, meanwhile, a positioning roller is driven by a motor two to limit from both sides, so that the cable is stably transmitted and has no transverse deviation, the effect that the cable accurately passes through the metering wheel is achieved, and the accuracy of length metering is improved through the above structure.
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Description

Technical Field

[0001] This utility model relates to the field of wire and cable length measurement technology, and in particular to a wire and cable length measurement device. Background Technology

[0002] In the production, processing, construction, and quality inspection of wires and cables, accurate measurement of their length is crucial for ensuring product quality, fair trade, and accurate engineering construction. A wire and cable length measuring device, as the core equipment for achieving this function, directly affects the reliability of the measurement results. With the rapid development of the wire and cable industry, the market is placing increasingly higher demands on the accuracy, stability, and adaptability of measuring devices, driving continuous technological innovation.

[0003] In existing technologies, cable length measuring devices typically use a frame as a support base, equipped with a conveying mechanism for transporting the cable and a measuring mechanism for measuring its length. The conveying mechanism usually employs a single conveyor wheel or belt, driven by a motor to rotate, using friction to move the cable forward. The measuring mechanism mainly relies on a measuring wheel in contact with the cable. As the cable moves, it drives the measuring wheel to rotate, and this rotation is transmitted to an encoder via gears or belts. The encoder converts the mechanical rotation into an electrical signal, which is then displayed on an instrument to indicate the cable length. To prevent positional deviations during cable transport, some devices incorporate fixed guide plates or guide wheels on both sides of the transport path for limiting movement.

[0004] However, in existing technologies, the friction between the conveying wheel and the cable is unstable, easily leading to cable slippage. Furthermore, the guide structures on both sides are mostly fixed and cannot be flexibly adjusted according to the cable diameter, causing lateral deviation of the cable during transmission. These problems prevent the cable from accurately passing through the measuring wheel, resulting in a mismatch between the rotation of the measuring wheel and the actual distance the cable travels. Ultimately, this leads to inaccurate length measurement results, failing to meet the requirements of high-precision measurement. Therefore, a wire and cable length measuring device is proposed to solve these problems. Utility Model Content

[0005] The purpose of this application is to provide a wire and cable length measuring device, which aims to improve the problem of inaccurate measurement caused by slippage and deviation during cable transmission in the prior art.

[0006] The wire and cable length measuring device provided in this application adopts the following technical solution:

[0007] A wire and cable length measuring device includes a base plate, a side plate fixedly connected to the side wall of the base plate, a conveying wheel rotatably connected inside the side plate, a measuring wheel rotatably connected inside the side plate, a silicone wheel sleeve provided on the side wall of the measuring wheel, a digital display provided on the top of the side plate, a limit component provided on the side wall of the side plate, and a fixing component provided inside the measuring wheel.

[0008] The limiting assembly includes a fixed sleeve and a positioning roller. The side wall of the fixed sleeve is fixedly connected to the side wall of the side plate. The side wall of the positioning roller is slidably connected to the inside of the fixed sleeve. A connecting frame is fixedly connected to the side wall of the positioning roller. The side wall of the connecting frame is slidably connected to the inside of the base plate. A rack is fixedly connected to the side wall of the connecting frame. A second motor is fixedly connected to the inside of the base plate. A gear is fixedly connected to the output end of the second motor. The gear meshes with the rack.

[0009] By adopting the above technical solution, the left and right limiting effect of the cable can be achieved.

[0010] Preferably, the fixing component includes a sliding block and a locking block. The sidewall of the sliding block is slidably connected to the inside of the counting wheel, the sidewall of the locking block is fixedly connected to the sidewall of the sliding block, and the sidewall of the locking block is slidably connected to the inside of the silicone wheel sleeve.

[0011] By adopting the above technical solution, the effect of increasing friction with the cable can be achieved.

[0012] Preferably, a rotating shaft is rotatably connected inside the side plate, the measuring wheel is slidably connected to the side wall of the rotating shaft, a pressure plate is slidably connected to the side wall of the rotating shaft, the side wall of the pressure plate is attached to the side wall of the measuring wheel, a coupling is fixedly connected to one end of the rotating shaft, an encoder is provided on the side wall of the coupling, a reducer is provided at one end of the conveying wheel, a motor is fixedly connected to the side wall of the reducer, and the output end of the motor is fixedly connected inside the reducer.

[0013] By adopting the above technical solution, the desired cable transmission effect can be achieved.

[0014] Preferably, an adjusting block is rotatably connected to the side wall of the rotating shaft, the side wall of the adjusting block is slidably connected to the inside of the side plate, an adjusting screw is rotatably connected inside the adjusting block, and the side wall of the adjusting screw is threadedly connected to the inside of the side plate.

[0015] By adopting the above technical solution, the vertical adjustment effect of the meter wheel can be achieved.

[0016] Preferably, a cylinder is fixedly connected to the side wall of the side plate, a fixed frame is fixedly connected to the output end of the cylinder, and a silicone pressure roller is rotatably connected inside the fixed frame. The silicone pressure roller is at a 45° angle to the axis of the conveyor wheel.

[0017] By adopting the above technical solution, the effect of adjusting the upper and lower clamping of the cable can be achieved.

[0018] Preferably, a positioning block is fixedly connected to the side wall of the meter wheel, and the side wall of the positioning block is slidably connected inside the silicone wheel sleeve.

[0019] By adopting the above technical solution, the positioning effect of the silicone wheel sleeve can be achieved.

[0020] Preferably, a rotating block is rotatably connected inside the sliding block, and a spring is provided inside the measuring wheel. One end of the spring is fixedly connected inside the measuring wheel, and the other end of the spring is fixedly connected to the side wall of the rotating block.

[0021] By adopting the above technical solution, the silicone wheel sleeve can be fixed.

[0022] Preferably, a lever is fixedly connected to the side wall of the sliding block, and a retainer is fixedly connected to the side wall of the meter wheel. The retainer is used to lock the position of the sliding block by engaging with the lever when the sliding block is pushed to slide.

[0023] By adopting the above technical solution, the silicone wheel sleeve can be easily disassembled and assembled.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. In this utility model, a motor drives a conveyor wheel to transmit the cable and a cylinder drives a silicone pressure roller to press the cable at a 45° angle. At the same time, a second motor drives a positioning roller to limit the cable from both sides, so that the cable is transmitted stably and without lateral deviation, thereby achieving the effect of accurately passing through the meter wheel. This solves the problem of slippage and deviation in the existing cable transmission, which leads to inaccurate measurement. The above structure improves the accuracy of length measurement.

[0026] 2. In this utility model, the positioning block in the fixing component initially positions the device, and the spring-driven locking block clamps it. With the locking function of the lever and the sleeve, the silicone wheel sleeve can achieve a stable connection with the measuring wheel and quick replacement. This ensures the stability of the contact between the measuring wheel and the cable, and solves the problems of cumbersome wheel sleeve replacement and easy loosening of the connection leading to a decrease in measurement accuracy. The above structure improves the maintenance efficiency and measurement stability of the device. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of a wire and cable length measuring device proposed in this utility model;

[0028] Figure 2 This is a schematic diagram of the back of a wire and cable length measuring device proposed in this utility model;

[0029] Figure 3This is a schematic diagram of the internal structure of the base plate of the wire and cable length measuring device proposed in this utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the adjustment component of the wire and cable length measuring device proposed in this utility model;

[0031] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0032] Figure 6 This is a schematic diagram of the meter-counting wheel of a wire and cable length measuring device proposed in this utility model;

[0033] Figure 7 This is a schematic diagram of the structure of the fixing component of the wire and cable length measuring device proposed in this utility model;

[0034] Explanation of reference numerals in the attached drawings: 1. Base plate; 2. Side plate; 3. Conveyor wheel; 4. Meter counter wheel; 5. Digital display; 6. Encoder; 7. Motor 1; 8. Cylinder; 9. Fixing frame; 10. Silicone pressure roller; 11. Fixing sleeve; 12. Positioning roller; 13. Connecting frame; 14. Motor 2; 15. Gear; 16. Rack; 17. Silicone wheel sleeve; 18. Pressure plate; 19. Positioning block; 20. Sleeve; 21. Sliding block; 22. Locking block; 23. Rotating block; 24. Spring; 25. Paddle; 26. Rotating shaft; 27. Adjusting block; 28. Adjusting screw. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0036] Example 1: A wire and cable length measuring device, referring to Figures 1-5 The device includes a base plate 1, which supports all components and ensures overall stability, providing a stable platform for device operation. A side plate 2 is fixedly connected to the side wall of the base plate 1. A conveyor wheel 3 is rotatably connected inside the side plate 2. The conveyor wheel 3 is used to drive the cable to move and achieve the cable transmission effect. A measuring wheel 4 is rotatably connected inside the side plate 2. The measuring wheel 4 is used to contact the cable and rotate with the cable. The cable length is calculated by the number of rotations and its own circumference, realizing the core function of length measurement. A silicone wheel sleeve 17 is provided on the side wall of the measuring wheel 4. The silicone wheel sleeve 17 is made of silicone and its function is to increase the friction with the cable and prevent the cable from being scratched. A digital display 5 is provided on the top of the side plate 2. The digital display 5 is used to display the cable length and realize the intuitive presentation of the measurement result. A limit component is provided on the side wall of the side plate 2. The limit component is used to limit the lateral movement of the cable and prevent the cable from deviating. A fixing component is provided inside the measuring wheel 4. The fixing component is used to realize the stable connection between the silicone wheel sleeve 17 and the measuring wheel 4 and to facilitate easy replacement.

[0037] The limiting assembly includes a fixed sleeve 11 and a positioning roller 12. The side wall of the fixed sleeve 11 is fixedly connected to the side wall of the side plate 2. The fixed sleeve 11 is used to guide and support the positioning roller 12 to ensure stable sliding of the positioning roller 12. The side wall of the positioning roller 12 is slidably connected to the inside of the fixed sleeve 11. The positioning roller 12 is used to contact the cable from the side to limit the lateral deviation of the cable and ensure the stability of the cable transmission path. A connecting frame 13 is fixedly connected to the side wall of the positioning roller 12. The side wall of the connecting frame 13 is slidably connected to the inside of the base plate 1. The base plate 1 is used to guide the sliding of the connecting frame 13 to ensure smooth movement of the connecting frame 13. A rack 16 is fixedly connected to the side wall of the connecting frame 13. A second motor 14 is fixedly connected inside the base plate 1. The second motor 14 is used to provide power. A gear 15 is fixedly connected to the output end of the second motor 14. The gear 15 meshes with the rack 16. The gear 15 and the rack 16 mesh and drive the connecting frame 13 and the positioning roller 12 to move synchronously, achieving the effect of flexibly adjusting the spacing of the positioning roller 12 according to the cable diameter.

[0038] A rotating shaft 26 is rotatably connected inside the side plate 2. The rotating shaft 26 drives the measuring wheel 4 to rotate and transmits the rotation to the encoder 6, realizing the transmission of power and motion. The measuring wheel 4 is slidably connected to the side wall of the rotating shaft 26. The rotating shaft 26 provides rotational support for the measuring wheel 4, ensuring stable rotation. A pressure plate 18 is slidably connected to the side wall of the rotating shaft 26. The side wall of the pressure plate 18 is attached to the side wall of the measuring wheel 4. The pressure plate 18 is used to axially press the measuring wheel 4 to prevent axial movement of the measuring wheel 4 on the rotating shaft 26, ensuring stable rotation of the measuring wheel 4. A coupling is fixedly connected to one end of the rotating shaft 26. The coupling is used to connect the rotating shaft 26 and the encoder 6 to realize rotation... To ensure smooth transmission of motion and avoid the impact of installation errors between the rotating shaft 26 and the encoder 6 on signal transmission, the encoder 6 is installed on the side wall of the coupling. The encoder 6 is used to convert the mechanical rotation of the rotating shaft 26 into an electrical signal, providing a data source for length measurement. A reducer is installed at one end of the conveyor wheel 3. The reducer is used to ensure that the conveyor wheel 3 outputs appropriate speed and power. A motor 7 is fixedly connected to the side wall of the reducer. The motor 7 provides power for the rotation of the conveyor wheel 3 and drives the conveyor wheel 3 to rotate stably. The output end of the motor 7 is fixedly connected inside the reducer. The motor 7 works with the reducer to drive the conveyor wheel 3 to rotate, achieving the effect of providing stable power for cable transmission.

[0039] An adjusting block 27 is rotatably connected to the side wall of the rotating shaft 26. The adjusting block 27 supports the rotating shaft 26 and drives it to move, thereby adjusting the position of the measuring wheel 4. The side wall of the adjusting block 27 is slidably connected inside the side plate 2. The side plate 2 provides guidance for the sliding of the adjusting block 27, ensuring that the adjusting block 27 moves smoothly. An adjusting screw 28 is rotatably connected inside the adjusting block 27. The adjusting screw 28 is used to drive the adjusting block 27 to move by rotation, thereby achieving precise adjustment of the position of the adjusting block 27. The side wall of the adjusting screw 28 is threadedly connected inside the side plate 2. The adjusting screw 28 works with the adjusting block 27 to perform helical transmission, driving the rotating shaft 26 and the measuring wheel 4 to move up and down, thereby achieving the effect of adjusting the height of the measuring wheel 4 according to the cable diameter and ensuring good contact between the measuring wheel 4 and the cable.

[0040] A cylinder 8 is fixedly connected to the side wall of the side plate 2. The cylinder 8 is used to provide power. A fixed frame 9 is fixedly connected to the output end of the cylinder 8. The fixed frame 9 is used to install the silicone pressure roller 10, providing support and positioning for it. The silicone pressure roller 10 is rotatably connected inside the fixed frame 9. The silicone pressure roller 10 is used to press against the cable, increasing the friction between the cable and the conveyor wheel 3 and preventing the cable from slipping. The silicone pressure roller 10 is at a 45° angle to the axis of the conveyor wheel 3. The silicone pressure roller 10 works with the conveyor wheel 3 to clamp and convey the cable, achieving the effect of ensuring stable cable transmission and avoiding slippage that affects the metering accuracy.

[0041] Example 2: A wire and cable length measuring device, referring to... Figures 6-7 The fixing components include a sliding block 21 and a locking block 22. The side wall of the sliding block 21 is slidably connected to the inside of the measuring wheel 4. The sliding block 21 is used to drive the locking block 22 to move, so as to achieve the engagement or disengagement of the locking block 22 with the silicone wheel sleeve 17. The side wall of the locking block 22 is fixedly connected to the side wall of the sliding block 21 and slidably connected to the inside of the silicone wheel sleeve 17. The locking block 22 is used to embed into the silicone wheel sleeve 17, fixing the silicone wheel sleeve 17 to the measuring wheel 4 and preventing the silicone wheel sleeve 17 from falling off. A positioning block 19 is fixedly connected to the side wall of the measuring wheel 4, and the side wall of the positioning block 19 is slidably connected to the silicone wheel sleeve 17. Inside the wheel sleeve 17, the positioning block 19 is used to initially position the silicone wheel sleeve 17 to ensure the accurate installation position of the silicone wheel sleeve 17 and the measuring wheel 4. The sliding block 21 is rotatably connected to the rotating block 23. The measuring wheel 4 is equipped with a spring 24, which provides elastic restoring force. One end of the spring 24 is fixedly connected to the inside of the measuring wheel 4, and the other end of the spring 24 is fixedly connected to the side wall of the rotating block 23. The spring 24, together with the sliding block 21 and the locking block 22, performs elastic extension and retraction movement, so that the locking block 22 always keeps the silicone wheel sleeve 17 in a locked state.

[0042] A lever 25 is fixedly connected to the side wall of the sliding block 21. The lever 25 is used to drive the sliding block 21 to slide, which facilitates the operation of the sliding block 21. A retaining sleeve 20 is fixedly connected to the side wall of the measuring wheel 4. The retaining sleeve 20 is used to lock the position of the sliding block 21 by engaging with the lever 25 when the sliding block 21 is pushed to slide. The retaining sleeve 20 and the lever 25 engage to fix the position of the sliding block 21 when the silicone wheel sleeve 17 is replaced, which facilitates the operation. The combination of components such as the sliding block 21, retaining block 22, positioning block 19, spring 24, lever 25, and retaining sleeve 20 realizes the quick disassembly and assembly and stable connection between the silicone wheel sleeve 17 and the measuring wheel 4. This not only ensures the stability of the silicone wheel sleeve 17 during the measurement process, but also improves the convenience of replacing the silicone wheel sleeve 17.

[0043] Working principle: When using this equipment, firstly, the wires and cables to be measured are introduced into the device. Motor 7 drives the conveyor wheel 3 to rotate through the reducer. The conveyor wheel 3, as the main power component, drives the cable to move along the preset path. At the same time, the cylinder 8 on the side wall of the side plate 2 pushes the fixing frame 9, so that the silicone pressure roller 10 inside the fixing frame 9 presses the cable at an angle of 45° with the axis of the conveyor wheel 3. The elasticity and friction of the silicone ensure that the cable is in close contact with the conveyor wheel 3, avoiding slippage and providing a guarantee for stable transmission.

[0044] During cable transmission, motor 14 starts, and the gear 15 at its output end meshes with the rack 16 on the side wall of the connecting frame 13, causing the connecting frame 13 to slide inside the base plate 1, thereby causing the positioning roller 12 in the fixed sleeve 11 to move synchronously. By adjusting the position of the positioning roller 12, it can be limited from both sides of the cable to prevent the cable from shifting laterally during transmission and ensure that the cable can pass through the meter counting wheel 4 accurately.

[0045] The measuring wheel 4 is the core component for measuring length. Its silicone wheel sleeve 17 is in direct contact with the cable. When the cable moves, it will drive the measuring wheel 4 and the rotating shaft 26 to rotate together. The rotating shaft 26 transmits the rotation to the encoder 6 through a coupling. The encoder 6 converts the mechanical rotation into an electrical signal and transmits it to the digital display 5. The digital display 5 processes the signal and displays the cable length in real time. In addition, the position of the rotating shaft 26 and the measuring wheel 4 can be adjusted by rotating the adjusting screw 28, so that the adjusting block 27 can slide inside the side plate 2, thereby ensuring that the measuring wheel 4 maintains good contact with the cable.

[0046] For the silicone wheel sleeve 17, a fixed component is used to achieve a stable connection with the measuring wheel 4 and facilitate easy replacement. During installation, the positioning block 19 is inserted into the silicone wheel sleeve 17 for initial positioning. Under the elastic force of the spring 24, the sliding block 21 drives the locking block 22 to engage with the silicone wheel sleeve 17, thus completing the fixation. During replacement, the lever 25 is moved to make the sliding block 21 slide, and the locking block 22 disengages from the silicone wheel sleeve 17. At this time, the lever 25 engages with the locking sleeve 20 to lock the position, making it easy to remove the old wheel sleeve and install the new wheel sleeve. After replacement, the reverse operation can restore the fixation. At the same time, the pressure plate 18 is attached to the side wall of the measuring wheel 4, further enhancing the stability of the connection between the measuring wheel 4 and the rotating shaft 26 and ensuring measurement accuracy.

Claims

1. A wire and cable length measuring device, comprising a base plate (1), characterized in that: The base plate (1) is fixedly connected to the side wall of the side plate (2), the side plate (2) is rotatably connected to the inside of the conveyor wheel (3), the side plate (2) is rotatably connected to the inside of the side plate (2), the side wall of the measuring wheel (4) is provided with a silicone wheel sleeve (17), the top of the side plate (2) is provided with a digital display (5), the side wall of the side plate (2) is provided with a limit component, and the measuring wheel (4) is provided with a fixing component inside; The limiting assembly includes a fixed sleeve (11) and a positioning roller (12). The side wall of the fixed sleeve (11) is fixedly connected to the side wall of the side plate (2). The side wall of the positioning roller (12) is slidably connected to the inside of the fixed sleeve (11). A connecting frame (13) is fixedly connected to the side wall of the positioning roller (12). The side wall of the connecting frame (13) is slidably connected to the inside of the base plate (1). A rack (16) is fixedly connected to the side wall of the connecting frame (13). A second motor (14) is fixedly connected inside the base plate (1). A gear (15) is fixedly connected to the output end of the second motor (14). The gear (15) meshes with the rack (16).

2. The wire and cable length measuring device according to claim 1, characterized in that: The fixing component includes a sliding block (21) and a locking block (22). The side wall of the sliding block (21) is slidably connected to the inside of the meter wheel (4). The side wall of the locking block (22) is fixedly connected to the side wall of the sliding block (21). The side wall of the locking block (22) is slidably connected to the inside of the silicone wheel sleeve (17).

3. The wire and cable length measuring device according to claim 1, characterized in that: The side plate (2) is rotatably connected to a rotating shaft (26). The measuring wheel (4) is slidably connected to the side wall of the rotating shaft (26). The side wall of the rotating shaft (26) is slidably connected to a pressure plate (18). The side wall of the pressure plate (18) is attached to the side wall of the measuring wheel (4). One end of the rotating shaft (26) is fixedly connected to a coupling. The side wall of the coupling is provided with an encoder (6). One end of the conveying wheel (3) is provided with a reducer. The side wall of the reducer is fixedly connected to a motor (7). The output end of the motor (7) is fixedly connected inside the reducer.

4. The wire and cable length measuring device according to claim 3, characterized in that: The side wall of the rotating shaft (26) is rotatably connected to an adjusting block (27), the side wall of the adjusting block (27) is slidably connected to the inside of the side plate (2), and the inside of the adjusting block (27) is rotatably connected to an adjusting screw (28), the side wall of the adjusting screw (28) is threadedly connected to the inside of the side plate (2).

5. The wire and cable length measuring device according to claim 1, characterized in that: A cylinder (8) is fixedly connected to the side wall of the side plate (2), and a fixed frame (9) is fixedly connected to the output end of the cylinder (8). A silicone roller (10) is rotatably connected inside the fixed frame (9), and the silicone roller (10) is at a 45° angle to the axis of the conveyor wheel (3).

6. The cable length measuring device according to claim 2, characterized in that: The measuring wheel (4) has a positioning block (19) fixedly connected to its side wall, and the side wall of the positioning block (19) is slidably connected inside the silicone wheel sleeve (17).

7. The wire and cable length measuring device according to claim 2, characterized in that: The sliding block (21) is rotatably connected to a rotating block (23), and the measuring wheel (4) is provided with a spring (24). One end of the spring (24) is fixedly connected to the inside of the measuring wheel (4), and the other end of the spring (24) is fixedly connected to the side wall of the rotating block (23).

8. The wire and cable length measuring device according to claim 7, characterized in that: The sliding block (21) is fixedly connected to a paddle (25) on its side wall, and the meter wheel (4) is fixedly connected to a retainer (20) on its side wall. The retainer (20) is used to lock the position of the sliding block (21) by engaging with the paddle (25) when the sliding block (21) is pushed to slide.