A laser caliper for cables and a method of caliper measurement

Abstract

This invention relates to the field of laser measuring instrument technology, and more particularly to a laser diameter gauge for cables and its diameter measurement method. It includes a housing, on which a display module, a laser emitter, and a laser receiver are mounted. The housing is fixedly connected to a limiting seat, a first fixed frame, and two second fixed frames. A sliding block is slidably connected to the limiting seat, and a sliding frame is fixedly connected to the sliding block. Each of the first fixed frame, the two second fixed frames, and the sliding frame is equipped with a roller feeding module for conveying the cable. The cable has a first allowance section and a second allowance section. By using the first and second allowance sections, when fluctuations occur in the production line, the allowance sections absorb the fluctuations themselves, keeping the cable in the area between the first fixed frame and the sliding frame stable. This effectively isolates the interference of production line traction fluctuations on the diameter measuring section, significantly improving the measurement accuracy and stability of the laser diameter gauge.

Description

Technical Field

[0001] This invention relates to the field of laser measuring instrument technology, and in particular to a laser diameter gauge for cables and its diameter measuring method. Background Technology

[0002] Laser diameter gauges, with their significant advantages such as non-contact measurement, high-precision detection, and real-time feedback, have become a key testing device in the quality control process of cable production. Their working principle is as follows: a laser emitter emits a beam, which, after processing by an optical system, forms a parallel scanning beam that scans the cable within the measurement area at high speed. A photodetector located on the other side of the cable receives the scanning beam. When the beam scans the cable, the light is blocked. By analyzing the output signal of the photodetector, data related to the cable diameter can be obtained.

[0003] Those skilled in the art have observed in actual production processes that existing laser diameter gauges are typically installed directly on the cable production and conveying path, with the cable continuously passing through the gauge's measurement area under the pull of traction equipment. Due to fluctuations in the production line's traction force, changes in traction speed, and the cable's own vibration during transport, especially when measuring flexible cables, the cable's tension within the measurement area is unstable. This tension fluctuation directly causes radial jitter and axial movement of the cable within the measurement area, resulting in deviations in the laser beam's blocking time when scanning the cable, ultimately leading to distorted measurement data and fluctuating measurement values. Summary of the Invention

[0004] To overcome the shortcomings mentioned in the background above, the present invention provides a laser diameter gauge for cables and a diameter measurement method thereof.

[0005] The technical implementation of the present invention is as follows: A laser diameter gauge for cables includes a housing, on which a display module, a laser emitter, and a laser receiver are mounted. The housing is fixedly connected to a limiting seat, a first fixed frame, and two second fixed frames. The limiting seat is slidably connected to a sliding block, and the sliding block is fixedly connected to a sliding frame. The first fixed frame, the two second fixed frames, and the sliding frame are all provided with roller feeding modules. All roller feeding modules are used to jointly transport the cable. The first fixed frame and the sliding frame are located between the two second fixed frames. A first allowance section is provided between the first fixed frame and the adjacent second fixed frame, and a second allowance section is provided between the sliding frame and the adjacent second fixed frame. Both the first allowance section and the second allowance section are used to buffer the fluctuations of the cable.

[0006] As an improvement to the above solution, the limiting seat is provided with a sliding plate, and a first elastic element is provided between the sliding plate and the sliding block.

[0007] As an improvement to the above solution, symmetrically distributed dampers are provided between the sliding plate and the sliding block.

[0008] As an improvement to the above solution, the limiting seat is hinged with symmetrically distributed swing members, and a second elastic member is provided between the symmetrically distributed swing members. The sliding block is fixed with symmetrically distributed pressing blocks. The swing members have limiting parts, and the limiting parts of the swing members are used to limit the adjacent pressing blocks.

[0009] As an improvement to the above solution, the pressing block and the limiting part of the adjacent swing member are both provided with inclined surfaces on their opposite sides for mutual guidance.

[0010] As an improvement to the above solution, a limiting frame is also included. The limiting frame is fixed to the limiting seat on the side near the first fixed frame. The limiting frame is rotatably connected to a rotating component. The sliding plate is slidably connected to the limiting seat and the sliding plate is threadedly connected to the rotating component.

[0011] As an improvement to the above solution, it also includes symmetrically distributed support frames, which are fixed to the first fixed frame. The symmetrically distributed support frames are jointly fixed to a guide cylinder, which is used to limit the cable and the cable passes through the guide cylinder.

[0012] As an improvement to the above solution, the symmetrically distributed support frames are jointly fixed to a limiting member, the limiting member being ball-connected to a guide end, the guide cylinder being located between the guide end and the first fixed frame, the guide end being used to guide the cable, and the cable passing through the guide end.

[0013] As an improvement to the above solution, both the guide cylinder and the guide end have guide surfaces on the side away from the first fixing frame.

[0014] A method for measuring the diameter of cables using a laser diameter gauge, based on a laser diameter gauge for cables, includes the following steps: Step 1: Push the sliding frame so that the sliding block slides along the limiting seat and compresses the first elastic element to store force. The extrusion block passes the limiting part of the swinging member, and the swinging member blocks the extrusion block from rebounding. The first elastic element is compressed and stores force. Step 2: Pass the cable sequentially through the roller feeding module on the second fixed frame near the first fixed frame, the guide end, the guide cylinder, the roller feeding module of the first fixed frame, the roller feeding module of the sliding frame, and the roller feeding module on the second fixed frame near the sliding frame. Then straighten the portion of the cable between the first fixed frame and the sliding frame, so that the portion of the cable between the first fixed frame and the front second fixed frame forms the first allowance section, and the portion of the cable between the sliding frame and the rear second fixed frame forms the second allowance section. Step 3: Control the two swinging parts to release the limit on the sliding block, the first elastic element releases the elastic force to push the sliding block to move, and the sliding block drives the sliding frame to move synchronously to straighten the cable; Step 4: Rotate the rotating component to drive the sliding plate to move linearly along the limiting seat through the threaded transmission, thereby changing the compression amount of the first elastic component and ensuring that the first elastic component can keep the part of the cable located between the first fixed frame and the sliding frame in a straight state. Step 5: Start the laser emitter and laser receiver. The laser receiver converts the received scanning light signal into an electrical signal and transmits it to the display module to output the detection data in real time. Start all roller conveyor modules to transport the cable. Step 6: During the continuous cable conveying process, when the traction force of the production line fluctuates, the first and second allowance sections absorb the tension impact through changes in their own length, thus isolating the transmission of cable fluctuations. Step 7: After the batch of cables has been transported, turn off the roller conveyor module, laser transmitter and laser receiver in sequence to complete the diameter measurement.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention uses a first allowance section and a second allowance section respectively set between the first fixed frame and the sliding frame and the adjacent second fixed frame. When the traction force of the production line fluctuates, the allowance section absorbs the tension fluctuation by itself, so that the cable tension in the area between the first fixed frame and the sliding frame remains stable. This effectively isolates the interference of the traction force fluctuation of the production line on the diameter measuring section, and significantly improves the measurement accuracy and stability of the laser diameter measuring instrument under dynamic production conditions.

[0016] By using a first elastic element and a damper between the sliding block and the sliding plate, the cable is straightened and kept stable during the conveying process. At the same time, the damper reduces the reciprocating oscillation of the cable during the conveying and straightening process, further improving the smoothness of the cable diameter measurement section.

[0017] By using the guide cylinder and guide end set on the first fixed frame, the cable can smoothly transition when leaving the first allowance section, reducing the additional bending stress or friction damage caused by angle changes at the entrance and exit of the allowance section, and ensuring the alignment accuracy of the cable diameter measurement section. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the first and second fixing frames of the present invention; Figure 3 This is a schematic diagram of the planar structure of the sliding frame and the swinging component of the present invention; Figure 4 This is a three-dimensional structural diagram of the second elastic element and the extrusion block of the present invention; Figure 5 This is a three-dimensional structural diagram of the limiting frame and rotating component of the present invention; Figure 6 This is a three-dimensional structural diagram of the first fixing frame and support frame of the present invention; Figure 7 This is a schematic diagram of the planar structure of the limiting member and guide end of the present invention.

[0019] The components in the attached diagram are labeled as follows: 1: Housing, 2: Display module, 3: Laser emitter, 4: Laser receiver, 5: Limiting seat, 6: First fixed frame, 7: Second fixed frame, 8: Sliding block, 9: Sliding frame, 101: Cable, 201: Sliding plate, 202: First elastic element, 301: Damper, 401: Swinging element, 402: Second elastic element, 403: Pressing block, 501: Limiting frame, 502: Rotating element, 601: Support frame, 602: Guide cylinder, 603: Limiting element, 604: Guide end. Detailed Implementation

[0020] 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.

[0021] Example 1

[0022] A laser diameter gauge for cables, such as Figures 1-6 As shown, the device includes a housing 1, on which a display module 2, a laser emitter 3, and a laser receiver 4 are mounted. The housing 1 is fixedly connected to a limiting seat 5, a first fixed frame 6, and two second fixed frames 7. The limiting seat 5 is slidably connected to a sliding block 8, and the sliding block 8 is fixedly connected to a sliding frame 9. The first fixed frame 6, the two second fixed frames 7, and the sliding frame 9 are all equipped with roller conveying modules. All roller conveying modules are used to jointly convey the cable 101. The first fixed frame 6 and the sliding frame 9 are located between the two second fixed frames 7. The cable 101 is provided with a first allowance section between the first fixed frame 6 and the adjacent second fixed frame 7, and the cable 101 is provided with a second allowance section between the sliding frame 9 and the adjacent second fixed frame 7. Both the first allowance section and the second allowance section are used to buffer the fluctuations of the cable 101.

[0023] In the above scheme, the outer casing 1 has a detection channel, and the specific internal structure of the outer casing 1 is not shown in the figure. The display module 2, laser emitter 3, and laser receiver 4 are all existing devices. The laser emitter 3 and laser receiver 4 are respectively installed on both sides of the detection channel on the outer casing 1. The laser emitter 3 and laser receiver 4 are arranged coaxially. The cable 101 passes between the laser emitter 3 and the laser receiver 4. The laser receiver 4 is used to receive the attenuated scanning light emitted by the laser emitter 3. Taking the roller conveying module on the sliding frame 9 as an example, the roller conveying module consists of an upper conveying roller, a lower conveying roller, two electric rotating shafts, and two connecting plates. All roller conveying modules are located at the same height. The lower electric rotating shaft is installed on the sliding frame 9, and the upper electric rotating shaft is installed on the two connecting plates. The connecting plates slide within the sliding frame 9. A spring is provided between the connecting plates and the sliding frame 9. The lower conveying roller is fixedly connected to the rotating shaft of the lower electric rotating shaft, and the upper conveying roller is fixedly connected to the rotating shaft of the upper electric rotating shaft. The cable 101 is located in the first The section between the fixed frame 6 and the sliding frame 9 is the diameter measuring section. The cable 101 is conveyed from front to back. Along the conveying direction, the cable 101 consists of a first allowance section, a diameter measuring section, and a second allowance section. The front end of the cable 101 is connected to the unwinding roller, and the rear end is connected to the take-up roller. The take-up roller, unwinding roller, and the electric rotating shaft of the roller feeding module have the same conveying speed. The lengths of the first and second allowance sections can be set according to the site conditions, without further limitation. After the two conveying rollers of the roller feeding module on the sliding frame 9 have pulled the cable 101, they are still in a state of storage. Through the first and second allowance sections set between the first fixed frame 6 and the sliding frame 9 and the adjacent second fixed frame 7, when the production line traction force fluctuates, the allowance sections absorb the tension fluctuations themselves, keeping the tension of the cable 101 in the area between the first fixed frame 6 and the sliding frame 9 stable. This effectively isolates the interference of the production line traction force fluctuations on the diameter measuring section, significantly improving the measurement accuracy and stability of the laser diameter measuring instrument under dynamic production conditions.

[0024] like Figure 4 and Figure 5 As shown, the limiting seat 5 is provided with a sliding plate 201, a first elastic element 202 is provided between the sliding plate 201 and the sliding block 8, and symmetrically distributed dampers 301 are provided between the sliding plate 201 and the sliding block 8. The limiting seat 5 is hinged with symmetrically distributed swinging elements 401, and a second elastic element 402 is provided between the symmetrically distributed swinging elements 401. The sliding block 8 is fixed with symmetrically distributed pressing blocks 403. The swinging elements 401 have a limiting part, which is used to limit the adjacent pressing blocks 403. The pressing blocks 403 and the limiting parts of the adjacent swinging elements 401 are both provided with inclined surfaces on opposite sides for mutual guidance.

[0025] In the above scheme, the first elastic element 202 is a spring. In this embodiment, the limiting seat 5 and the sliding plate 201 are considered to be fixedly connected. The second elastic element 402 is a compression spring. Before the initial use of this device, the operator pushes the sliding frame 9 forward to limit the swinging element 401 to the corresponding pressing block 403. After the cable 101 passes through all the roller conveying modules, the operator squeezes the rear part of the swinging element 401 towards the middle to make the swinging element 401 lose its limit on the corresponding pressing block 403, causing the sliding frame 9 to move backward. The roller conveying module on the sliding frame 9 further straightens the part of the cable 101 in the diameter measuring section, improving the running stability of the diameter measuring section of the cable 101.

[0026] Working principle: When using this device to measure cable 101, the operator first pushes the sliding frame 9 forward. The first elastic element 202 compresses and stores force, and the sliding frame 9 drives the two pressing blocks 403 to move together. The sliding frame 9 presses the two dampers 301 to move together. As the pressing block 403 moves, the pressing block 403 contacts the limiting part of the adjacent swinging member 401. Then, the pressing block 403 presses the inclined surface of the corresponding limiting part of the swinging member 401, and the second elastic element 402 compresses and stores force. The front sides of the two swinging members 401 swing outward. During this process, the swinging member 401 swings relative to the limiting seat 5 until the pressing block 403 passes the limiting part of the adjacent swinging member 401. The second elastic member 402 releases its own elastic force, and the two swinging members 401 are reset relative to the limiting seat 5. At this time, the pressing block 403 is located in front of the swinging member 401. Then the operator stops pushing the sliding frame 9. Under the action of the first elastic member 202, the sliding block 8 moves backward. The sliding block 8 drives the parts on it to move together. Then the pressing block 403 contacts the front of the adjacent swinging member 401.

[0027] After the extrusion block 403 contacts the front side of the adjacent swinging member 401, the operator pulls all the upper conveying rollers upward to pass the rear end of the cable 101 between the two conveying rollers of the front second fixed frame 7. Then, the operator passes the cable 101 through the two conveying rollers on the first fixed frame 6, the two conveying rollers on the sliding frame 9, and the two conveying rollers on the rear second fixed frame 7 in sequence. After the cable 101 passes through the four roller conveying modules in sequence, the rear end of the cable 101 is connected to the take-up roller. Then, the operator straightens the cable 101 located between the first fixed frame 6 and the sliding frame 9, and then lowers the upper conveying rollers of the first fixed frame 6 and the sliding frame 9. The operator reserves the first and second excess sections of the cable 101 to complete the insertion of the cable 101.

[0028] After cable 101 is inserted, the worker presses the rear of the swing member 401 towards the center. The second elastic member 402 is compressed by the two swing members 401. The swing member 401 swings relative to the limiting seat 5. As the swing member 401 swings, it loses contact with the adjacent pressing block 403, and loses its limiting effect on the adjacent pressing block 403. During this process, the elastic force of the first elastic member 202 is released. At the same time, under the action of the damper 301, the sliding block 8 drives its parts to move slowly backward. The two conveying rollers on the sliding frame 9 drive the clamped cable 101 to move slowly, further straightening the diameter measuring section of the cable 101. The damper 301 attenuates the reciprocating oscillation of the cable 101 during the conveying and straightening process, further improving the smooth operation of the diameter measuring section of the cable 101. At this time, the state of the cable 101 is as follows: Figure 2 As shown.

[0029] After the section of cable 101 is partially straightened, the laser emitter 3 and laser receiver 4 are activated first. The laser receiver 4 transmits the received scanning light and outputs the detection data in real time through the display module 2. Then, the electric rotating shafts on all roller conveying modules are activated. The rotating shafts of the two electric rotating shafts on the roller conveying modules drive the corresponding conveying rollers to rotate. At the same time, the unwinding roller and the winding roller are activated. The unwinding roller conveys cable 101, and the winding roller winds up cable 101. When the traction force of the production line fluctuates, the spare section absorbs the tension fluctuations by itself, so that the tension of cable 101 in the area of ​​the first fixed frame 6 and the sliding frame 9 remains stable. This effectively isolates the interference of the traction force fluctuations of the production line on the diameter measuring section and significantly improves the measurement accuracy and stability of the laser diameter measuring instrument under dynamic production conditions.

[0030] As the unwinding roller releases the cable 101, the cable 101 is transported. The front end of the cable 101 passes through the roller feeding modules arranged from front to back in sequence. The unwinding roller is then turned off, followed by the turning off of the electric shafts on all the roller feeding modules. The laser emitter 3 and the laser receiver 4 are then turned off, completing the diameter measurement of this batch of cables 101. When the device is needed to measure the diameter of the cable 101 again, the above steps can be repeated.

[0031] Example 2

[0032] Based on Example 1, such as Figures 3-5 As shown, it also includes a limit frame 501, which is fixed to the limit seat 5 on the side near the first fixed frame 6. The limit frame 501 is rotatably connected to a rotating component 502. The sliding plate 201 is slidably connected to the limit seat 5, and the sliding plate 201 is threadedly connected to the rotating component 502.

[0033] In the above scheme, the rotating part 502 consists of a threaded part and a handle part. When the rotating part 502 rotates, it drives the sliding plate 201 to move linearly along the limiting seat 5, changing the initial compression of the first elastic element 202, thereby adjusting the initial tension and buffer stroke. This can adapt to the tension requirements of cables 101 of different materials, improving the adaptability of the device to different operating conditions. Figure 5 The middle sliding plate 201 is in the state of minimum tension of cable 101.

[0034] Working principle: After the two conveying rollers on the sliding frame 9 straighten part of the diameter measuring section of the cable 101, the operator observes the tension of the cable 101. When the tension of the cable 101 is insufficient, the operator rotates the handle of the rotating part 502, which drives the sliding plate 201 to move backward along the limit seat 5 through the threaded transmission part, compressing the first elastic element 202. This setting increases the squeezing force between the sliding block 8 and the sliding plate 201 until the squeezing force of the first elastic element 202 matches the tension of the cable 101. Then, the operator stops rotating the handle of the rotating part 502 and adjusts the cable 101 for different tensions to further improve the straightening of the diameter measuring section of the cable 101, thus ensuring the accuracy of the test.

[0035] Example 3

[0036] Based on Example 2, such as Figures 1-3 , Figure 6 and Figure 7 As shown, it also includes symmetrically distributed support frames 601, which are fixed to the first fixed frame 6. The symmetrically distributed support frames 601 are jointly fixed to a guide cylinder 602, which is used to limit the cable 101 and the cable 101 passes through the guide cylinder 602. The symmetrically distributed support frames 601 are jointly fixed to a limiting member 603, which is ball-jointed with a guide end 604. The guide cylinder 602 is located between the guide end 604 and the first fixed frame 6. The guide end 604 is used to guide the cable 101 and the cable 101 passes through the guide end 604. The guide cylinder 602 and the guide end 604 both have a guiding surface on the side away from the first fixed frame 6.

[0037] In the above scheme, the guide cylinder 602 and guide end 604 enable the cable 101 to smoothly transition when leaving the first allowance section, reducing the additional bending stress or friction damage caused by angle changes at the entrance and exit of the allowance section, and ensuring the alignment accuracy of the diameter measuring section of the cable 101.

[0038] Working principle: After the rear end of cable 101 is inserted between the two conveying rollers of the front second fixed frame 7, the operator will pass the rear end of cable 101 through the guide end 604 and the guide cylinder 602 in sequence, and then through the two conveying rollers of the roller feeding module on the sliding frame 9 and the two conveying rollers of the roller feeding module on the rear second fixed frame 7 in sequence.

[0039] When the roller conveyor module conveys the cable 101, the guide end 604 guides the portion of the cable 101 that has passed through the first allowance section toward the center. During this process, the guide end 604 rotates adaptively with the allowance section of the cable 101. At the same time, in conjunction with the guide cylinder 602, the cable 101 can be smoothly guided and limited when leaving the first allowance section. This reduces the additional bending stress or friction damage to the cable 101 caused by angle changes at the entrance and exit of the allowance section, and ensures the centering accuracy of the diameter measuring section of the cable 101.

[0040] Example 4

[0041] A method for measuring the diameter of cables using a laser diameter gauge, such as... Figures 1-7 As shown, a laser diameter gauge for cables includes the following steps: Step 1: Push the sliding frame 9 so that the sliding block 8 slides along the limiting seat 5 and compresses the first elastic member 202 to store force. The extrusion block 403 passes the limiting part of the swing member 401. The swing member 401 blocks the extrusion block 403 from rebounding, and the first elastic member 202 is compressed and stores force. Step 2: Pass the cable 101 sequentially through the roller feeding module on the second fixed frame 7 near the first fixed frame 6, the guide end 604, the guide cylinder 602, the roller feeding module of the first fixed frame 6, the roller feeding module of the sliding frame 9, and the roller feeding module on the second fixed frame 7 near the sliding frame 9. Then straighten the portion of the cable 101 between the first fixed frame 6 and the sliding frame 9, so that the portion of the cable 101 between the first fixed frame 6 and the front second fixed frame 7 forms a first allowance section, and the portion of the cable 101 between the sliding frame 9 and the rear second fixed frame 7 forms a second allowance section. Step 3: Control the two swinging parts 401 to release the limit on the sliding block 8, the first elastic element 202 releases the elastic force to push the sliding block 8 to move, and the sliding block 8 drives the sliding frame 9 to move synchronously to straighten the cable 101; Step 4: Rotate the rotating part 502, and drive the sliding plate 201 to move linearly along the limiting seat 5 through the threaded transmission, change the compression amount of the first elastic element 202, so that the first elastic element 202 can ensure that the part of the cable 101 located between the first fixed frame 6 and the sliding frame 9 remains straight. Step 5: Start the laser emitter 3 and laser receiver 4. The laser receiver 4 converts the received scanning light signal into an electrical signal and transmits it to the display module 2 to output the detection data in real time. Start all roller conveyor modules to transport the cable 101. Step 6: During the continuous conveying of cable 101, when the traction force of the production line fluctuates, the first and second allowance sections absorb the tension impact through changes in their own lengths, thus isolating the transmission of fluctuations in cable 101. Step 7: After the batch of cables 101 has been conveyed, turn off the roller conveyor module, laser transmitter 3 and laser receiver 4 in sequence to complete the diameter measurement.

[0042] In summary, the invention includes, but is not limited to, the above embodiments. Any equivalent substitutions or partial improvements made under the spirit and principles of this invention shall be considered to be within the protection scope of this invention.

Claims

1. A laser diameter gauge for cables, comprising a housing (1), wherein the housing (1) is equipped with a display module (2), a laser emitter (3), and a laser receiver (4), characterized in that, The outer shell (1) is fixedly connected to a limiting seat (5), a first fixed frame (6) and two second fixed frames (7). The limiting seat (5) is slidably connected to a sliding block (8). The sliding block (8) is fixedly connected to a sliding frame (9). The first fixed frame (6), the two second fixed frames (7) and the sliding frame (9) are all provided with roller conveying modules. All roller conveying modules are used to jointly convey the cable (101). The first fixed frame (6) and the sliding frame (9) are located between the two second fixed frames (7). The cable (101) is located between the first fixed frame (6) and the adjacent second fixed frame (7) with a first allowance section. The cable (101) is located between the sliding frame (9) and the adjacent second fixed frame (7) with a second allowance section. The first allowance section and the second allowance section are both used to buffer the fluctuation of the cable (101).

2. A laser diameter gauge for cables according to claim 1, characterized in that, The limiting seat (5) is provided with a sliding plate (201), and a first elastic element (202) is provided between the sliding plate (201) and the sliding block (8).

3. A laser diameter gauge for cables according to claim 2, characterized in that, A symmetrically distributed damper (301) is provided between the sliding plate (201) and the sliding block (8).

4. A laser diameter gauge for cables according to claim 3, characterized in that, The limiting seat (5) is hinged with symmetrically distributed swing members (401), and a second elastic member (402) is provided between the symmetrically distributed swing members (401). The sliding block (8) is fixed with symmetrically distributed pressing blocks (403). The swing member (401) has a limiting part, and the limiting part of the swing member (401) is used to limit the adjacent pressing blocks (403).

5. A laser diameter gauge for cables according to claim 4, characterized in that, The pressing block (403) and the limiting part of the adjacent swing member (401) are both provided with inclined surfaces on opposite sides for guiding each other.

6. A laser diameter gauge for cables according to claim 5, characterized in that, It also includes a limiting frame (501), which is fixed to the limiting seat (5) on the side near the first fixed frame (6). The limiting frame (501) is rotatably connected to a rotating component (502). The sliding plate (201) is slidably connected to the limiting seat (5), and the sliding plate (201) is threadedly connected to the rotating component (502).

7. A laser diameter gauge for cables according to claim 6, characterized in that, It also includes symmetrically distributed support frames (601), which are fixed to the first fixed frame (6). The symmetrically distributed support frames (601) are all fixed to a guide cylinder (602). The guide cylinder (602) is used to limit the cable (101), and the cable (101) passes through the guide cylinder (602).

8. A laser diameter gauge for cables according to claim 7, characterized in that, The symmetrically distributed support frames (601) are jointly fixed to a limiting member (603), the limiting member (603) is ball-connected to a guide end (604), the guide cylinder (602) is located between the guide end (604) and the first fixed frame (6), the guide end (604) is used to guide the cable (101), and the cable (101) passes through the guide end (604).

9. A laser diameter gauge for cables according to claim 8, characterized in that, Both the guide cylinder (602) and the guide end (604) have guide surfaces on the side away from the first fixing frame (6).

10. A method for measuring the diameter of a cable using a laser diameter gauge, as described in claim 9, characterized in that... It includes the following steps: Step 1: Push the sliding frame (9) so that the sliding block (8) slides along the limiting seat (5) and compresses the first elastic element (202) to store force. The extrusion block (403) passes the limiting part of the swinging element (401). The swinging element (401) blocks the extrusion block (403) from rebounding, and the first elastic element (202) is squeezed to store force. Step 2: Pass the cable (101) sequentially through the roller feeding module, guide end (604), guide cylinder (602), roller feeding module of the first fixed frame (6), roller feeding module of the sliding frame (9), and roller feeding module of the second fixed frame (7) near the first fixed frame (6). Then straighten the portion of the cable (101) between the first fixed frame (6) and the sliding frame (9), so that the portion of the cable (101) between the first fixed frame (6) and the front second fixed frame (7) forms a first allowance section, and the portion of the cable (101) between the sliding frame (9) and the rear second fixed frame (7) forms a second allowance section. Step 3: Control the two swinging parts (401) to release the limit on the sliding block (8), the first elastic element (202) releases the elastic force to push the sliding block (8) to move, and the sliding block (8) drives the sliding frame (9) to move synchronously to straighten the cable (101); Step 4: Rotate the rotating part (502) to drive the sliding plate (201) to move linearly along the limiting seat (5) through the threaded transmission, change the compression amount of the first elastic element (202) so that the first elastic element (202) can ensure that the part of the cable (101) located between the first fixed frame (6) and the sliding frame (9) remains straight; Step 5: Start the laser transmitter (3) and laser receiver (4). The laser receiver (4) converts the received scanning light signal into an electrical signal and transmits it to the display module (2) to output the detection data in real time. Start all roller conveyor modules to transport the cable (101). Step 6: During the continuous conveying of cable (101), when the traction force of the production line fluctuates, the first and second margin sections absorb the tension impact through their own length changes, thus isolating the transmission of fluctuations in cable (101). Step 7: After the batch of cables (101) is transported, turn off the roller conveyor module, laser transmitter (3) and laser receiver (4) in sequence to complete the diameter measurement.

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