A wiring measuring device for communication cables

Abstract

The utility model relates to wiring measurement device technical field, especially communication cable wiring measurement device, including frame, the inside fixed setting unwinding roller of frame, the bottom four corners of frame all are fixedly set support foot, still including movable frame, the inside rotation setting of movable frame rotation wheel and compression wheel, the compression wheel is located the right top of rotation wheel, the outer wall fixed setting of movable frame support frame, support frame top one side fixed setting support cylinder, support cylinder top sets up detachable fixed cylinder, support cylinder and fixed cylinder inner wall all set up rubber buffer layer, and the setting of plug -in mechanism between support cylinder and fixed cylinder, movable frame top sets up adjusting mechanism, movable frame one side sets up measuring mechanism, the utility model discloses a communication cable wiring measurement device, through the plug -in mechanism with support cylinder fixed cylinder and plug -in fixed, form the clamping structure, and the rubber buffer layer of fixed cylinder and support cylinder inner wall forms double -layer protection, avoids cable end -to -end in transportation or storage and is damaged.

Description

Technical Field

[0001] This utility model relates to the field of wiring measurement device technology, and in particular to a wiring measurement device for communication cables. Background Technology

[0002] Traditional communication cable wiring measurement devices typically consist of an unwinding roller, a movable frame, a rotating wheel, a pressure wheel, and a measuring mechanism. After the cable is drawn out from the unwinding roller, it passes through the gap between the rotating wheel and the pressure wheel inside the movable frame. As the pressure wheel moves down, the bottom of the cable forms a surface contact friction with the top of the rotating wheel, achieving cable sliding synchronously and driving the rotating wheel to rotate. The measuring mechanism then digitally measures the wiring length. Although such devices can complete length measurement during the wiring process, there is a significant defect in the way the cable ends are handled after wiring: the cut ends of the cable are directly exposed to the outside without an effective protective structure.

[0003] In outdoor cabling, frequent handling or storage and transportation at engineering sites, exposed cable ends are susceptible to damage from physical collisions, friction, and environmental erosion. Specifically, this manifests as: poor contact due to deformation of the metal conductor at the end caused by external pressure; short circuit risk due to damage to the insulation layer caused by friction; or accelerated material aging due to changes in environmental temperature and humidity. Traditional devices, lacking end protection structures, cannot avoid the risk of cable ends being exposed to complex environments after being cut. Especially in scenarios requiring multiple cabling operations or long-distance transportation, the probability of end damage increases significantly, directly affecting cable lifespan and communication quality stability.

[0004] Therefore, to address the issue of cable end damage during storage and transportation, a wiring measurement device for communication cables can be designed. When using this device, after the cable is drawn from the unwinding roller, it passes through the gap between the rotating wheel and the clamping wheel within the movable frame. The cable end is then pressed against the inner wall of the support cylinder to facilitate initial wiring length calculation. Subsequently, the rotating adjustment mechanism moves downwards, causing the clamping wheel to press firmly against the top of the cable. At this point, the bottom of the cable and the top of the rotating wheel form surface contact friction, ensuring that the cable's sliding motion during wiring drives the rotating wheel to rotate synchronously. As the cable pulls the rotating wheel, the measuring mechanism measures the wiring length. After wiring is completed, the cable is cut at the inner wall of the support cylinder. The cable end is then inserted into the support cylinder cavity, initially positioned by the inner wall's rubber buffer layer. A clamping mechanism then connects the fixing cylinder and the support cylinder, forming a clamping structure. The rubber buffer layers on the inner walls of the fixing cylinder and the support cylinder provide double-layer protection, preventing damage to the cable end during transportation or storage. Utility Model Content

[0005] After wiring is completed, the cable ends are directly exposed to the outside without effective protection. The exposed cable ends are susceptible to damage from physical collisions, friction, and environmental corrosion. Therefore, when used in storage and transportation scenarios, it is difficult to avoid the problem of cable ends being damaged during storage and transportation.

[0006] The technical solution of this utility model is as follows: a wiring measuring device for communication cables, including a frame, an unwinding roller fixedly installed inside the frame, support feet fixedly installed at the four corners of the bottom of the frame, and a movable frame, a rotating wheel and a pressing wheel rotatably installed inside the movable frame, the pressing wheel being located directly above the rotating wheel, a support frame fixedly installed on the outer wall of the movable frame, a support cylinder fixedly installed on one side of the top of the support frame, a detachable fixed cylinder installed above the support cylinder, a rubber buffer layer installed on the inner wall of both the support cylinder and the fixed cylinder, a plug-in mechanism installed between the support cylinder and the fixed cylinder, an adjustment mechanism installed at the top of the movable frame, a sliding mechanism installed between the bottom of the movable frame and the bottom of the frame, and a measuring mechanism installed on one side of the movable frame.

[0007] Preferably, when using this type of wiring measurement device for communication cables, after the cable is led out from the unwinding roller, it passes through the gap between the rotating wheel and the clamping wheel in the movable frame. Then, the end of the cable is pressed against the inner wall of the support cylinder to facilitate the calculation of the initial wiring length. Subsequently, the clamping wheel is moved downward by the rotation adjustment mechanism so that it is pressed against the top of the cable. At this time, the bottom of the cable and the top of the rotating wheel form a surface contact friction, ensuring that the cable can drive the rotating wheel to rotate synchronously during wiring. When the cable pulls the rotating wheel to rotate, the measuring mechanism measures the wiring length. After the wiring is completed, the operator cuts the cable at the inner wall of the support cylinder, and then inserts the end of the cable into the inner cavity of the support cylinder. It is initially positioned by the rubber buffer layer on the inner wall, and then the fixing cylinder and the support cylinder are inserted and fixed by the insertion mechanism to form a clamping structure. The rubber buffer layer on the inner wall of the fixing cylinder and the support cylinder form a double layer of protection to prevent the cable end from being damaged during transportation or storage.

[0008] Preferably, the insertion mechanism includes insertion holes and insertion rods. Two sets of insertion holes are symmetrically opened on both sides of the top surface of the support cylinder, and two sets of insertion rods are symmetrically and fixedly installed on both sides of the bottom surface of the fixed cylinder. The insertion rods and insertion holes are mutually adapted and engaged.

[0009] Preferably, the adjustment mechanism includes a connecting seat, guide columns, and a limiting ring. The connecting seat is provided on the top inner side of the movable frame, and the pressure wheel is rotatably disposed inside the connecting seat. Guide columns are symmetrically and fixedly disposed on both sides of the top of the connecting seat. Each set of guide columns passes through and slides on the top of the movable frame, and a limiting ring is fixedly disposed at the upper end of each set of guide columns.

[0010] Preferably, the adjustment mechanism also includes an adjustment stud, an adjustment handwheel, and a limiting pad. The adjustment stud is installed through the top of the movable frame and is threadedly connected to the top of the movable frame. The adjustment handwheel is fixedly installed at the upper end of the adjustment stud, and the limiting pad is fixedly installed at the lower end of the adjustment stud. The limiting pad is tightly fitted to the top of the connecting seat.

[0011] Preferably, the sliding mechanism includes a slide rail, a slide rod, and a slide seat. The slide rail is provided between the bottom of the movable frame and the bottom of the frame. The slide rail is fixedly installed inside the frame. The slide rod is fixedly installed inside the slide rail. The slide seat is slidably fitted onto the side wall of the slide rod. The top of the slide seat is fixedly connected to the bottom of the movable frame.

[0012] Preferably, a rotating shaft is rotatably installed inside the movable frame, and a rotating wheel is fixedly installed on the side wall of the rotating shaft.

[0013] Preferably, the measuring mechanism includes a rotary encoder and a controller. The rotary encoder is fixedly installed on one side of the movable frame, and the rotary encoder connection end is connected to one end of the rotating shaft. The controller is fixedly installed on one side of the frame and is electrically connected to the rotary encoder.

[0014] The beneficial effects of this utility model are:

[0015] 1. When using this type of wiring measurement device for communication cables, after the cable is led out from the unwinding roller, it passes through the gap between the rotating wheel and the clamping wheel in the movable frame. Then, the end of the cable is pressed against the inner wall of the support cylinder to facilitate the calculation of the initial wiring length. Subsequently, the clamping wheel is moved downward by the rotation adjustment mechanism so that it is pressed against the top of the cable. At this time, the bottom of the cable and the top of the rotating wheel form a surface contact friction to ensure that the cable can slide and drive the rotating wheel to rotate synchronously during wiring. When the cable pulls the rotating wheel to rotate, the measuring mechanism measures the wiring length. After the wiring is completed, the operator cuts the cable at the inner wall of the support cylinder and then inserts the end of the cable into the inner cavity of the support cylinder. The cable is initially positioned by the rubber buffer layer on the inner wall, and then the fixing cylinder and the support cylinder are inserted and fixed by the insertion mechanism to form a clamping structure. The rubber buffer layer on the inner wall of the fixing cylinder and the support cylinder form a double layer of protection to prevent the cable end from being damaged during transportation or storage.

[0016] 2. The rotary encoder directly collects the rotation data of the rotating wheel, and the controller automatically converts it, avoiding the error of manual reading and ensuring that the cable length measurement accuracy can reach the millimeter level. The clamping force between the rotating wheel and the clamping wheel can be quantitatively controlled through the adjustment mechanism, which not only ensures smooth cable sliding but also prevents slippage and improves data reliability.

[0017] 3. The support cylinder and the fixed cylinder are quickly assembled through the plug-in hole structure. The inner wall rubber buffer layer can buffer external impacts and prevent the insulation layer from being damaged or the metal conductor from being exposed due to squeezing and friction at the cable end, thus extending the service life of the cable.

[0018] 4. The sliding mechanism adopts a three-stage guiding structure of slide rail-slide rod-slide seat. The movable frame can automatically adjust its position as the cable moves laterally, adapting to the wiring characteristics of the cable winding in a serpentine manner on the unwinding roller. It can maintain continuous contact between the measurement system and the cable without manual intervention. Attached Figure Description

[0019] Figure 1 The diagram shown is a first three-dimensional structural schematic of a wiring measurement device for communication cables according to this utility model.

[0020] Figure 2 The diagram shown is a partial three-dimensional structural schematic of a wiring measurement device for communication cables according to this utility model.

[0021] Figure 3 The diagram shown is a partial three-dimensional structural schematic of the combination of the rotating wheel and the clamping wheel of the wiring measuring device for communication cables according to this utility model.

[0022] Figure 4 The diagram shown is a partial three-dimensional structural diagram of the combination of the rotating wheel and the clamping wheel of the wiring measuring device for communication cables according to this utility model.

[0023] Figure 5 The diagram shown is a three-dimensional structural diagram of the fixed cylinder and support cylinder of a wiring measuring device for communication cables according to this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Unwinding roller; 3. Support foot; 4. Movable frame; 5. Rotating wheel; 6. Pressing wheel; 7. Support frame; 8. Support cylinder; 9. Fixed cylinder; 10. Rubber buffer layer; 11. Insertion hole; 12. Insertion rod; 13. Connecting seat; 14. Guide post; 15. Limiting ring; 16. Adjusting stud; 17. Adjusting handwheel; 18. Limiting pad; 19. Slide rail; 20. Slide rod; 21. Slide seat; 22. Rotating shaft; 23. Rotary encoder; 24. Controller. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please see Figure 1 and Figure 2This utility model provides an embodiment of a wiring measurement device for communication cables, including a frame 1, an unwinding roller 2 fixedly installed inside the frame 1, support feet 3 fixedly installed at the four corners of the bottom of the frame 1, and a movable frame 4. A rotating wheel 5 and a pressing wheel 6 are rotatably installed inside the movable frame 4, with the pressing wheel 6 located directly above the rotating wheel 5. A support frame 7 is fixedly installed on the outer wall of the movable frame 4, a support cylinder 8 is fixedly installed on one side of the top of the support frame 7, and a detachable fixing cylinder 9 is installed above the support cylinder 8. A rubber buffer layer 10 is installed on the inner wall of both the support cylinder 8 and the fixing cylinder 9. A plug-in mechanism is provided between the support cylinder 8 and the fixing cylinder 9. An adjustment mechanism is provided at the top of the movable frame 4, a sliding mechanism is provided between the bottom of the movable frame 4 and the bottom of the frame 1, and a measuring mechanism is provided on one side of the movable frame 4.

[0027] Please see Figure 4 and Figure 5 The insertion mechanism includes insertion holes 11 and insertion rods 12. Two sets of insertion holes 11 are symmetrically opened on both sides of the top surface of the support cylinder 8. Two sets of insertion rods 12 are symmetrically and fixedly installed on both sides of the bottom surface of the fixed cylinder 9. The insertion rods 12 and insertion holes 11 are mutually adapted and engaged. The two sets of insertion rods 12 at the bottom of the fixed cylinder 9 are aligned with the insertion holes 11 at the top of the support cylinder 8 and inserted to form a clamping structure. The adjustment mechanism includes a connecting seat 13, guide posts 14 and limiting rings 15. The connecting seat 13 is provided on the top of the inner side of the movable frame 4. The pressure wheel 6 is rotatably installed inside the connecting seat 13. Guide posts 14 are symmetrically and fixedly installed on both sides of the top of the connecting seat 13. Each set of guide posts 14 passes through and slides on the top of the movable frame 4. Each set of guide posts 14 is fixedly installed at the upper end of the upper end of each set of guide posts 14. The connecting seat 13 can be adjusted up and down along the top of the movable frame 4 through the guide posts 14.

[0028] Please see Figure 3 and Figure 4 The adjustment mechanism also includes an adjusting stud 16, an adjusting handwheel 17, and a limiting washer 18. The adjusting stud 16 is threaded through the top of the movable frame 4. The adjusting stud 16 is threadedly connected to the top of the movable frame 4. The adjusting handwheel 17 is fixedly installed at the upper end of the adjusting stud 16, and the limiting washer 18 is fixedly installed at the lower end of the adjusting stud 16. The limiting washer 18 is tightly fitted to the top of the connecting seat 13. By rotating the adjusting handwheel 17, the adjusting stud 16 is driven to move downward, causing the limiting washer 18 to push the connecting seat 13 downward, which in turn drives the clamping wheel 6 to press down tightly against the top of the cable. The sliding mechanism includes a slide rail 19, a slide rod 20, and a slide seat 21. The slide rail 19 is provided between the bottom of the movable frame 4 and the bottom of the frame 1. The slide rail 19 is fixedly installed inside the frame 1. The slide rod 20 is fixedly installed inside the slide rail 19. The slide seat 21 is slidably sleeved on the side wall of the slide rod 20. The top of the slide seat 21 is fixedly connected to the bottom of the movable frame 4. When the cable reciprocates laterally on the unwinding roller 2, the slide seat 21 slides laterally along the slide rod 20, so that the rotating wheel 5 always maintains coaxial contact with the cable, adapting to the lateral offset of different wiring paths.

[0029] Please see Figure 1 and Figure 3 The movable frame 4 has a rotating shaft 22 inside, and a rotating wheel 5 is fixedly mounted on the side wall of the rotating shaft 22. The rotating wheel 5 rotates through the rotating shaft 22. The measuring mechanism includes a rotary encoder 23 and a controller 24. The rotary encoder 23 is fixedly mounted on one side of the movable frame 4, and the connecting end of the rotary encoder 23 is connected to one end of the rotating shaft 22. The controller 24 is fixedly mounted on one side of the frame 1, and the controller 24 is electrically connected to the rotary encoder 23. When the cable pulls the rotating wheel 5 to rotate, the rotary encoder 23 collects the number of rotations of the rotating shaft 22 in real time and transmits it to the controller 24 through an electrical signal. The controller 24 converts the number of rotations into the actual wiring length according to the preset cable circumference parameters, thus completing the digital measurement.

[0030] When using this type of wiring measurement device for communication cables, the device achieves accurate measurement of cable wiring length and end protection functions through the coordinated operation of a precision mechanical structure and an intelligent measurement system. Its working principle can be broken down into the following core components:

[0031] After the cable is led out from the unwinding roller 2, it passes through the gap between the rotating wheel 5 and the pressing wheel 6 in the movable frame 4. Then, the end of the cable is pressed against the inner wall of the inner cavity of the support cylinder 8 to facilitate the calculation of the initial wiring length. Then, by rotating the adjusting handwheel 17, the adjusting stud 16 is driven to move down, so that the limiting pad 18 pushes the connecting seat 13 down, causing the pressing wheel 6 to press down and stick to the top of the cable. At this time, the bottom of the cable and the top of the rotating wheel 5 form a surface contact friction, ensuring that the cable can slide and drive the rotating wheel 5 to rotate synchronously during wiring.

[0032] The slide block 21 at the bottom of the movable frame 4 is sleeved on the slide rod 20 inside the slide rail 19. When the cable moves laterally back and forth on the unwinding roller 2, the slide block 21 slides laterally along the slide rod 20, so that the rotating wheel 5 always keeps coaxial contact with the cable, adapting to the lateral offset of different wiring paths.

[0033] In the measuring mechanism, the connecting end of the rotary encoder 23 is rigidly connected to the end of the rotating shaft 22. When the cable pulls the rotating wheel 5 to rotate, the rotary encoder 23 collects the number of rotations of the rotating shaft 22 in real time and transmits it to the controller 24 through an electrical signal. The controller 24 converts the number of rotations into the actual wiring length according to the preset cable circumference parameter, thus completing the digital measurement.

[0034] After the wiring is completed, the staff cuts the cable at the inner wall of the support cylinder 8, then inserts the cable end into the inner cavity of the support cylinder 8, and initially positions it through the inner wall rubber buffer layer 10. Then, the two sets of insertion rods 12 at the bottom of the fixing cylinder 9 are aligned with the insertion holes 11 at the top of the support cylinder 8 and inserted to form a clamping structure. The fixing cylinder 9 and the rubber buffer layer 10 on the inner wall of the support cylinder 8 form a double layer of protection to prevent the cable end from being damaged during transportation or storage.

[0035] At the start of the wiring process, the end of the cable is first placed against the inner wall of the support cylinder 8 to facilitate the calculation of the initial wiring length. At the end of the wiring process, the cable is cut off at the inner wall of the support cylinder 8. The above steps can ensure that the initial wiring length is consistent for the next time.

[0036] The rotary encoder 23 directly collects the rotation data of the rotating wheel 5 and automatically converts it with the controller 24, avoiding the error of manual reading and ensuring that the cable length measurement accuracy can reach the millimeter level. The clamping force between the rotating wheel 5 and the clamping wheel 6 can be quantitatively controlled through the adjustment mechanism, which not only ensures smooth cable sliding but also prevents slippage and improves data reliability.

[0037] The support cylinder 8 and the fixed cylinder 9 are quickly assembled through the insertion rod 12-insertion hole 11 structure. The inner wall rubber buffer layer 10 can buffer external impacts, avoid damage to the insulation layer or exposure of the metal conductor at the cable end due to squeezing and friction, and extend the service life of the cable.

[0038] The sliding mechanism adopts a three-stage guiding structure of slide rail 19-slide rod 20-slide seat 21. The movable frame 4 can automatically adjust its position as the cable moves laterally, adapting to the wiring characteristics of the cable winding in a serpentine manner on the unwinding roller 2. It can maintain continuous contact between the measurement system and the cable without manual intervention.

[0039] The adjustment handwheel 17 adopts a large diameter design to reduce rotational resistance. The plug-in structure of the fixed cylinder 9 and the support cylinder 8 can be operated with one hand, resulting in high disassembly and assembly efficiency. The controller 24 can be connected to an external display module or storage device to display the wiring length in real time and generate electronic records, meeting the data traceability requirements for project acceptance.

[0040] The frame 1 is made of profile welding process, and the bottom of the support foot 3 is equipped with anti-slip pads to ensure that the equipment remains stable under complex working conditions. The rotating wheel 5 is connected to the rotating shaft 22 through bearings to reduce rotational friction resistance and improve measurement response speed.

[0041] In summary, through the integrated design of mechanical transmission, electronic measurement, and protective structure, this device achieves fully automated management of the entire process from cable unwinding and length measurement to end protection, significantly improving the efficiency and quality of communication cable wiring operations.

[0042] Through the above steps, when using this type of communication cable wiring measurement device, after the cable is led out from the unwinding roller 2, it passes through the gap between the rotating wheel 5 and the pressing wheel 6 in the movable frame 4. Then, the end of the cable is pressed against the inner wall of the inner cavity of the support cylinder 8 to facilitate the calculation of the initial wiring length. Subsequently, the rotating adjustment mechanism moves downward so that the pressing wheel 6 is pressed against the top of the cable. At this time, the bottom of the cable and the top of the rotating wheel 5 form a surface contact friction to ensure that the cable can slide and drive the rotating wheel 5 to rotate synchronously during wiring. When the cable pulls the rotating wheel 5 to rotate, the measuring mechanism measures the wiring length. After the wiring is completed, the staff cuts the cable at the inner wall of the support cylinder 8, and then inserts the end of the cable into the inner cavity of the support cylinder 8. It is initially positioned by the inner wall rubber buffer layer 10, and then the fixing cylinder 9 is inserted and fixed to the support cylinder 8 by the insertion mechanism to form a clamping structure. The fixing cylinder 9 and the rubber buffer layer 10 on the inner wall of the support cylinder 8 form a double layer of protection to prevent the cable end from being damaged during transportation or storage.

[0043] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A wiring measurement device for communication cables, comprising a frame (1), an unwinding roller (2) fixedly disposed inside the frame (1), and support feet (3) fixedly disposed at the four corners of the bottom of the frame (1), characterized in that: It also includes a movable frame (4), inside which a rotating wheel (5) and a pressing wheel (6) are rotatably installed. The pressing wheel (6) is located directly above the rotating wheel (5). A support frame (7) is fixedly installed on the outer wall of the movable frame (4). A support cylinder (8) is fixedly installed on one side of the top of the support frame (7). A detachable fixed cylinder (9) is installed above the support cylinder (8). A rubber buffer layer (10) is installed on the inner wall of both the support cylinder (8) and the fixed cylinder (9). A plug-in mechanism is installed between the support cylinder (8) and the fixed cylinder (9). An adjustment mechanism is installed on the top of the movable frame (4). A sliding mechanism is installed between the bottom of the movable frame (4) and the bottom of the frame (1). A measuring mechanism is installed on one side of the movable frame (4).

2. The wiring measurement device for communication cables according to claim 1, characterized in that: The insertion mechanism includes a socket (11) and a rod (12). Two sets of sockets (11) are symmetrically opened on both sides of the top surface of the support cylinder (8). Two sets of rods (12) are symmetrically and fixedly installed on both sides of the bottom surface of the fixed cylinder (9). The rods (12) and the sockets (11) are mutually adapted and engaged.

3. The wiring measurement device for communication cables according to claim 1, characterized in that: The adjustment mechanism includes a connecting seat (13), a guide column (14) and a limiting ring (15). The connecting seat (13) is set on the top of the inner side of the movable frame (4). The pressing wheel (6) is rotatably set inside the connecting seat (13). The guide columns (14) are symmetrically and fixedly set on both sides of the top of the connecting seat (13). Each set of guide columns (14) passes through and slides on the top of the movable frame (4). A limiting ring (15) is fixedly set at the upper end of each set of guide columns (14).

4. The wiring measurement device for communication cables according to claim 3, characterized in that: The adjustment mechanism also includes an adjustment stud (16), an adjustment handwheel (17), and a limiting pad (18). The adjustment stud (16) is installed through the top of the movable frame (4). The adjustment stud (16) is threadedly connected to the top of the movable frame (4). The adjustment handwheel (17) is fixedly installed at the upper end of the adjustment stud (16). The limiting pad (18) is fixedly installed at the lower end of the adjustment stud (16). The limiting pad (18) is tightly fitted to the top of the connecting seat (13).

5. The wiring measurement device for communication cables according to claim 1, characterized in that: The sliding mechanism includes a slide rail (19), a slide rod (20) and a slide seat (21). The slide rail (19) is set between the bottom of the movable frame (4) and the bottom of the frame (1). The slide rail (19) is fixedly set inside the frame (1). The slide rod (20) is fixedly set inside the slide rail (19). The slide seat (21) is slidably sleeved on the side wall of the slide rod (20). The top of the slide seat (21) is fixedly connected to the bottom of the movable frame (4).

6. The wiring measurement device for communication cables according to claim 1, characterized in that: The movable frame (4) has a rotating shaft (22) inside, and the rotating wheel (5) is fixedly installed on the side wall of the rotating shaft (22).

7. The wiring measurement device for communication cables according to claim 6, characterized in that: The measuring mechanism includes a rotary encoder (23) and a controller (24). The rotary encoder (23) is fixedly installed on one side of the movable frame (4). The connecting end of the rotary encoder (23) is connected to the end of one side of the rotating shaft (22). The controller (24) is fixedly installed on one side of the frame (1). The controller (24) is electrically connected to the rotary encoder (23).

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