Test cable double-pull automatic take-up device

Abstract

A test cable double-pull automatic take-up device comprises a test cable, the test cable is wound on a cable bearing device, the cable bearing device is rotatably installed in an insulation shell, a supporting column is fixed to the center of the insulation shell, the cable bearing device is fixed between the center supporting column and the insulation shell, the insulation shell is provided with two outlets, and the outlets are communicated with the test cable. The two ends of the test cable extend out of the two outlets of the insulating shell, the two outlets of the insulating shell are both provided with lock catch devices used for locking stretching and retracting of the test cable, and a volute spiral spring is installed between the center supporting column and the cable bearing device in a winding mode; when a test cable is pulled, the cable bearing device rotates in the insulating shell to release or tighten the cable, and meanwhile, the volute spiral spring is automatically adjusted according to the tension of the cable to keep the tension balance of the cable; the locking device ensures that the cable is stable and does not slide at a specific position, and the precise double-pull automatic take-up function is achieved. By optimizing the structural design, the cable take-up and pay-off efficiency and stability are remarkably improved, the manual operation difficulty is reduced, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance ladders, in particular to a double-pull automatic wire winding device for test cables. Background Art

[0002] During the equipment maintenance process of the generator system, preventive tests need to be carried out on many equipment. Such tests belong to the category of high-voltage tests, and have extremely high requirements for the safety factor of the on-site environment. In particular, the on-site line layout must be standardized to ensure that each test line has a clear routing for easy wiring judgment.

[0003] During the actual on-site replacement test process, simultaneous disassembly of multiple lines will cause the cables to be intertwined with each other. The resistance at the intertwined part increases, affecting the test data, and increasing the test safety risk. If the wiring is re-done after each test, it will increase the labor cost. Therefore, this patent considers making a carrier dedicated to assisting high-voltage test cables on the premise of basically not affecting the test results to solve the problem of cumbersome wiring during the test process and ensure the safe progress of the test.

[0004] Generally, before the high-voltage test, the manual wire arrangement method is adopted to neatly arrange each test cable for easy test wiring judgment; after each group of tests, the test wires need to be re-arranged before the next test.

[0005] (1) Some test cables are relatively long and are very likely to be intertwined with each other during use. Each wire arrangement requires a lot of manpower, affecting the test efficiency;

[0006] (2) After the test, there are many on-site test cables, which are troublesome to tidy up, and there are often problems such as improper force during the tidying process, resulting in cable damage and affecting the next test.

[0007] For example, CN111232768B discloses a wire winding device for easy pulling, including a housing, a network cable and a winding mechanism. The housing is provided with two outer outlets; the middle of the network cable is connected to the winding mechanism, and both ends respectively extend out from the two outer outlets; the winding mechanism is installed in the housing and can automatically wind the network cable; a limiting mechanism capable of controlling the recovery of the network cable is provided at the outer outlet of the housing; however, this device uses a central axis rotation, the network cable enters and exits unidirectionally, the network cable is easy to knot, and the network cable is subjected to large force and is easy to break.

[0008] In summary, the cable winding and unwinding devices in the prior art still have many deficiencies in the test environment, such as poor versatility, easy damage to cables, high cost, etc.; therefore, it is necessary to develop a more efficient, intelligent and economical double-pull automatic wire winding device for test cables to solve the problems in the prior art and improve the test efficiency and safety. This is exactly the technical problem to be solved by the present invention. Summary of the Invention

[0009] The technical problem to be solved by the utility model is to provide a double-pull automatic wire rewinding device for test cables, so as to solve the problems that in the process of high-voltage tests, the wiring of test cables is cumbersome, time-consuming and laborious, and the existing test cable rewinding devices have poor versatility, are prone to damage the cables, and are costly.

[0010] To solve the above technical problem, the technical solution adopted by the utility model is: a double-pull automatic wire rewinding device for test cables, including a test cable, the test cable is wound around a wire carrier, the wire carrier is rotatably installed in an insulating housing, a support column is fixed at the center of the insulating housing, the wire carrier is fixed between the central support column and the insulating housing, the insulating housing is provided with two outlets, both ends of the test cable extend out from the two outlets of the insulating housing, and locking devices are provided at the two outlets of the insulating housing for locking the telescoping of the test cable, and a volute spring is wound and installed between the central support column and the wire carrier.

[0011] In a preferred solution, the insulating housing includes an upper cover and a lower cover that are buckled together up and down, and the centers of the upper cover and the lower cover are connected and fixed into one body by a central support column.

[0012] In a preferred solution, the wire carrier is sleeved on the central support column, a volute spring is wound around the central support column, one end of the volute spring is connected to the central support column, and the other end is hooked and fixed on the wire carrier.

[0013] In a preferred solution, the wire carrier is arranged in a cylindrical shape, a hole is provided at the center of the bottom of the cylinder, a spring baffle is provided on the circumference of the central hole in the middle of the cylinder, an outer cylinder is provided on the outer circle of the cylinder, and at least three notches are provided on the outer cylinder, namely a first notch, a second notch and a third notch.

[0014] In a preferred solution, the volute spring is sleeved and fixed on the central support column, winds out from the first notch of the outer cylinder, winds around the outer surface of the outer cylinder of the wire carrier, and is hooked and fixed at the second notch of the outer cylinder.

[0015] In a preferred solution, the middle part of the test cable is wound in the annular groove between the spring baffle and the outer cylinder of the wire carrier, one end winds out from the third notch of the outer cylinder and winds around the outer cylinder of the wire carrier, the other end winds out from the second notch of the outer cylinder and also winds around the outer cylinder of the wire carrier, and both ends of the test cable are wound on the outer cylinder of the wire carrier in layers and in the same direction.

[0016] In a preferred solution, wiring terminals are provided at both ends of the test cable. Both ends of the test cable are respectively wound around the outer cylinder of the wire carrier, then extend out from the two outlets of the insulating housing, and the wiring terminals at both ends thereof hang outside the outlets. Locking devices are installed on the outer sides of the two outlets of the two insulating housings, and long groove-shaped mounting holes are provided on the outer sides of the two outlets of the insulating housing, and the locking devices are installed therein.

[0017] In a preferred embodiment, the latching device includes an arc-shaped pressing spring piece installed on one side of the test cable outlet of the insulating housing, and a button assembly is slidably installed in the mounting hole on the other side. The button assembly slides along the mounting hole, and presses and locks the test cable with the pressing spring piece at the front end. When the button assembly retracts, the button assembly and the pressing spring piece release the test cable.

[0018] In a preferred embodiment, the button assembly includes a button, and a retaining piece is installed at the rear end of the button to prevent the button assembly from falling out of the mounting hole during the process of sliding forward along the mounting hole. The lower plane of the button is set as an inclined plane, with a small opening at the front end and a large opening at the rear end in contact with the pressing spring piece. A locking block is provided at the front end of the button, and an inverted cone is provided at the front end of the locking block to lock the test cable.

[0019] In a preferred embodiment, rubber protective layers are provided on the lower planes of the button, the retaining piece and the locking block of the button assembly to reduce wear on the test cable.

[0020] The double-pull automatic cable retracting device for test cables provided by the present utility model has the following beneficial effects:

[0021] 1. The present utility model solves the problem of cumbersome wiring of test cables during high-voltage tests, which is time-consuming and laborious.

[0022] 2. By designing a double-pull automatic cable retracting device for test cables, the present utility model realizes the rapid sorting and fixing of test cables, effectively improves the test efficiency, reduces the labor intensity of operators, and at the same time ensures the safety and cleanliness of the test site.

[0023] 3. The present utility model solves the problems of poor versatility, easy cable damage and high cost of existing test cable retracting devices, and improves the test efficiency and safety.

[0024] 4. Through the design of an adjustable latching device, the present utility model is adaptable to various specifications of cables, uses flexible materials to wrap the clamping surface to reduce cable wear; at the same time, the device has a compact structure, the materials selected are economical and durable, significantly reduces the cost, has a high degree of automation, and greatly improves the convenience and efficiency of test operations.

[0025] 5. The present utility model makes the layout of the test site more standardized, the wiring is clear, which is convenient for test personnel to judge the connection of test cables; at the same time, its unique modular design makes the assembly and disassembly of the equipment more simple and fast, improving the test efficiency.

[0026] 6. The present utility model also has a safety protection function, effectively preventing potential safety hazards caused by misoperations, and providing a reliable guarantee for the test process.

[0027] 7. The utility model is convenient for storage, solving the problem that the test cables are placed randomly when not in use. Its structure is designed compactly, with special storage grooves and fixing buckles, which can easily store the test cables neatly, avoiding mess, protecting the cables from damage, and improving the cleanliness and work efficiency of the laboratory.

[0028] 8. The utility model is applicable to a variety of test environments that require precise control of the cable length, enhancing the safety and practicability of the equipment.

[0029] 9. The setting of the scroll spring in the utility model ensures that the cable maintains an appropriate tension during the automatic cable retraction process, effectively preventing the cable from being overly loose or tight, further improving the service life of the cable and the accuracy of the test. At the same time, the spring design also facilitates the quick adjustment of the cable length to meet different test requirements, improving the flexibility and adaptability of the equipment.

[0030] 10. The setting of the locking device in the utility model realizes the stable locking and easy unlocking of the cable through precise mechanical design, effectively avoiding the risk of accidental cable detachment during the test process, ensuring the continuity of the test and the accuracy of the data. Its operation is simple, and it can be completed without special tools, reducing the requirements for the skills of the operator and improving the overall work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following further describes the utility model in conjunction with the drawings and embodiments:

[0032] Figure 1 is the overall exploded schematic diagram of the utility model;

[0033] Figure 2 is the top view of the overall structure of the utility model;

[0034] Figure 3 is the side view of the overall structure of the utility model;

[0035] Figure 4 is the assembly schematic diagram of the test cable, scroll spring and cable support of the utility model;

[0036] Figure 5 is the structural schematic diagram of the button assembly;

[0037] In the figure: test cable 1, insulating housing 2, terminal 3, locking device 4, scroll spring 5, cable support 6, support column 7, spring baffle 8, outer cylinder 9, first notch 10, second notch 11, third notch 12, pressing spring piece 13, button assembly 14, upper cover 21, lower cover 22, button 141, anti-detachment piece 142, locking block 143. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The technical solutions in the present utility model will be further described below in conjunction with the accompanying drawings and embodiments:

[0039] As Figures 1 to 5 shown, a double-pull automatic wire rewinding device for test cables includes a test cable 1, the test cable 1 is wound around a cable holder 6, the cable holder 6 is rotatably installed in an insulating housing 2, a support column 7 is fixed at the center of the insulating housing 2, the cable holder 6 is fixed between the central support column 7 and the insulating housing 2, the insulating housing 2 is provided with two outlets, both ends of the test cable 1 extend out from the two outlets of the insulating housing 2, and locking devices 4 are arranged at both outlets of the insulating housing 2 for locking the telescopic movement of the test cable 1, and a volute spring 5 is wound and installed between the central support column 7 and the cable holder 6.

[0040] In this embodiment, the insulating housing 2 includes an upper cover 21 and a lower cover 22 which are buckled with each other up and down, and the centers of the upper cover 21 and the lower cover 22 are connected and fixed into one body by the central support column 7.

[0041] Further, the cable holder 6 is sleeved on the central support column 7, the central support column 7 is wound with a volute spring 5, one end of the volute spring 5 is connected to the central support column 7, and the other end is hooked and fixed on the cable holder 6.

[0042] Further, the cable holder 6 is provided in a cylindrical shape, a hole is provided at the center of the bottom of the cylinder, a spring baffle 8 is provided on the circumference of the central hole in the middle of the cylinder, an outer cylinder 9 is provided on the outer circle of the cylinder, and at least three notches are provided on the outer cylinder 9, namely a first notch 10, a second notch 11 and a third notch 12.

[0043] Further, the volute spring 5 is sleeved and fixed on the central support column 7, winds out from the first notch 10 of the outer cylinder 9, winds around the outer surface of the outer cylinder 9 of the cable holder 6, and is hooked and fixed at the second notch 11 of the outer cylinder 9.

[0044] Further, the middle part of the test cable 1 is wound in the annular groove between the spring baffle 8 and the outer cylinder 9 of the cable holder 6, one end winds out from the third notch 12 of the outer cylinder 9 and winds around the outer cylinder 9 of the cable holder 6, the other end winds out from the second notch 11 of the outer cylinder 9 and also winds around the outer cylinder 9 of the cable holder 6, and both ends of the test cable 1 are wound on the outer cylinder 9 of the cable holder 6 in layers and in the same direction.

[0045] Further, wiring terminals 3 are provided at both ends of the test cable 1, both ends of the test cable 1 are respectively wound around the outer cylinder 9 of the cable holder 6, then wind out from the two outlets of the insulating housing 2, and the wiring terminals 3 at both ends thereof hang down outside the outlets. Locking devices 4 are installed on the outer sides of the two outlets of the two insulating housings 2, and long groove-shaped mounting holes are provided on the outer sides of the two outlets of the insulating housing 2, and the locking devices 4 are installed therein.

[0046] Further, the buckle device 4 includes an arc-shaped pressing elastic piece 13 installed on one side of the outlet of the test cable 1 of the insulating housing 2. On the other side, a button assembly 14 is slidably installed in the mounting hole. The button assembly 14 slides along the mounting hole and presses and locks the test cable 1 with the pressing elastic piece 13 at the front end. When the button assembly 14 retracts, the button assembly 14 and the pressing elastic piece 13 are loosened to release the test cable 1.

[0047] Further, the button assembly 14 includes a button 141. A retaining piece 142 is installed at the rear end of the button 141 to prevent the button assembly 14 from falling out of the mounting hole during the process of sliding forward along the mounting hole. The lower plane of the button 141 is set as an inclined plane, with a small opening at the front end and a large opening at the rear end in contact with the pressing elastic piece 13. A locking block 143 is provided at the front end of the button 141, and an inverted cone is provided at the front end of the locking block 143 to lock the test cable 1.

[0048] Further, rubber protection layers are provided on the lower planes of the button 141, the retaining piece 142 and the locking block 143 of the button assembly 14 to reduce the wear on the test cable 1.

[0049] During specific use, after the entire device is installed and debugged to be qualified, the outer shell of the automatic cable rewinding device uses insulating materials, and the cable holder 6 is firmly clamped and fixed on the insulating housing 2, and cannot be disassembled by the user at will; before use, the test cable 1 and the scroll spring 5 have been fixed well with the cable holder 6. The test cable 1 is wound around the cable holder 6 in two layers in the same direction, respectively carrying both ends of the test cable 1, and the test cable 1 is allowed to transition in the groove between the spring baffle 8 and the outer cylinder 9 of the cable holder 6, while increasing the internal space, so that the available length of the test cable 1 is greatly increased; one end of the scroll spring 5 is connected to the cable holder 6 and rotates with it during use, and the other end is connected to the central support column 7. Initially, the state of the automatic cable rewinding device is as Figure 3 , the scroll spring 5 is in a relaxed state. During the process of pulling the cable, one side of the scroll spring 5 is fixed and the other side rotates, creating elastic potential energy and generating a pulling force to achieve the effect of automatic cable rewinding; to ensure that the cable will not automatically retract during the test process, a buckle device 4 is installed at the outlet of the automatic cable rewinding device for fixation.

[0050] Before use, the appearance of the automatic cable retraction device should be checked to ensure it has a good structure. Retract and extend the cable several times to confirm the device is in good condition, and check whether the locking device 4 can be used properly to prevent abnormal situations during the test. When in use, the test cable 1 should be pulled to a sufficient distance before fixing it with the locking device 4. In this case, the cable is always in an approximately straight state, greatly reducing the probability of entanglement between cables. When changing different test groups, only need to push open the locking device 4 to arbitrarily control the cable length, improving the test efficiency. After the test is completed, press down and push backward to release the locking device 4, and the test cable 1 will automatically retract. The terminal 3 is stored in the protective sleeve to prevent damage to the cable and the device, and is also convenient for use in the next test.

[0051] In a preferred embodiment, the insulating housing 2 includes an upper cover 21 and a lower cover 22 that are buckled together up and down. The centers of the upper cover 21 and the lower cover 22 are connected and fixed into one body by a central support column 7. The above setting effectively enhances the structural strength and stability of the insulating housing 2, preventing deformation or damage in harsh environments. At the same time, the design of the central support column 7 optimizes the internal space layout, facilitating installation and maintenance, and improving the reliability and durability of the overall equipment.

[0052] In a preferred embodiment, the cable carrier 6 is sleeved on the central support column 7, and a volute spring 5 is wound around the central support column 7. One end of the volute spring 5 is connected to the central support column 7, and the other end is hooked and fixed on the cable carrier 6. The above setting effectively ensures that the cable carrier 6 can rotate flexibly and automatically reset when subjected to external forces. At the same time, the elastic action of the volute spring 5 can also provide a stable supporting force for the cable carrier 6, enhancing the stability and durability of the overall structure.

[0053] In a preferred embodiment, the cable carrier 6 is provided in a cylindrical shape. A hole is provided at the center of the bottom of the cylinder, and a spring baffle 8 is provided on the circumference of the central hole in the middle of the cylinder. An outer cylinder 9 is provided on the outer circle of the cylinder, and at least three notches are provided on the outer cylinder 9, namely the first notch 10, the second notch 11, and the third notch 12. The above setting enables the cable carrier 6 to firmly fix the cable. At the same time, the spring baffle 8 can flexibly adjust the tightness of the cable, and the three notches on the outer cylinder 9 facilitate the entry and fixation of the cable, enhancing the practicality and flexibility of the overall structure.

[0054] In a preferred embodiment, the volute spring 5 is sleeved and fixed on the central support column 7, exits from the first notch 10 of the outer cylinder 9, winds around the outer surface of the outer cylinder 9 of the cable carrier 6, and is hooked and fixed at the second notch 11 of the outer cylinder 9. The above setting enables the volute spring 5 to firmly support and adjust the position of the cable carrier 6. At the same time, its flexible winding method allows automatic adjustment of the tension under different operating states, ensuring stable transmission and reducing wear.

[0055] In a preferred embodiment, the middle part of the test cable 1 is wound in the annular groove between the spring baffle 8 and the outer cylinder 9 of the cable holder 6. One end is wound around the outer cylinder 9 of the cable holder 6 after passing out from the third notch 12 of the outer cylinder 9, and the other end is wound around the outer cylinder 9 of the cable holder 6 after passing out from the second notch 11 of the outer cylinder 9. The two ends of the test cable 1 are wound around the outer cylinder 9 of the cable holder 6 in layers and in the same direction. The above arrangement ensures the stability of the test cable 1 on the cable holder 6. At the same time, the winding method in layers and in the same direction optimizes the layout of the cable, reduces mutual interference and friction, and improves the accuracy of test data and the durability of the equipment.

[0056] In a preferred embodiment, terminal blocks 3 are provided at both ends of the test cable 1. The two ends of the test cable 1 are respectively wound around the outer cylinder 9 of the cable holder 6 and then pass out from the two outlets of the insulating housing 2. The terminal blocks 3 at both ends thereof hang down outside the outlets. Locking devices 4 are installed on the outer sides of the two outlets of the two insulating housings 2. Long groove-shaped mounting holes are provided on the outer sides of the two outlets of the insulating housing 2, and the locking devices 4 are installed therein. The above arrangement facilitates the quick connection and fixation of the test cable 1 during the test. At the same time, the design of the locking device 4 enhances the stability of the connection between the insulating housing 2 and the cable, prevents loosening or falling off during the test process, and ensures the safety and accuracy of the test.

[0057] In a preferred embodiment, the locking device 4 includes an arc-shaped pressing spring piece 13 installed on one side of the outlet of the test cable 1 of the insulating housing 2. On the other side, a button assembly 14 is slidably installed in the mounting hole. The button assembly 14 slides along the mounting hole and presses and locks the test cable 1 with the pressing spring piece 13 at the front end. When the button assembly 14 retreats, the button assembly 14 and the pressing spring piece 13 release the test cable 1. The above arrangement realizes the quick locking and release of the test cable 1, improves the operation efficiency and convenience. At the same time, the arc-shaped design of the pressing spring piece 13 ensures uniform force on the cable and extends the service life of the cable and the locking device 4.

[0058] In a preferred embodiment, the button assembly 14 includes a button 141. A retaining piece 142 is installed at the rear end of the button 141 to prevent the button assembly 14 from falling out of the mounting hole during the process of sliding forward along the mounting hole. The lower plane of the button 141 is set as an inclined plane, with a small opening at the front end and a large opening at the rear end with the pressing spring piece 13. A locking block 143 is provided at the front end of the button 141, and an inverted cone is provided at the front end of the locking block 143 to lock the test cable 1. The above arrangement ensures that the test cable 1 can be smoothly guided and firmly locked when inserted, and at the same time prevents the cable from accidentally falling off due to misoperation or external force, improving the safety and reliability of the equipment during use.

[0059] In a preferred embodiment, rubber protective layers are provided on the lower planes of the button 141, the anti - detachment piece 142 and the locking block 143 of the button assembly 14 to reduce the wear on the test cable 1. The above - mentioned arrangement not only extends the service life of the button assembly 14, but also ensures the integrity of the test cable 1 during long - term use, effectively avoiding cable damage caused by friction, thus ensuring the smooth progress of the test process and the accuracy of data. At the same time, the setting of the rubber protective layer also enhances the friction between the test cable 1 and the button 141, so that the test cable 1 is locked more tightly, further enhancing the reliability and safety of the test.

[0060] In summary, the present utility model provides a double - pull automatic cable retraction device for test cables, which solves the problems of cumbersome wiring, time - consuming and laborious work of test cables during high - voltage tests. By designing a double - pull automatic cable retraction device for test cables, the rapid arrangement and fixation of test cables are realized, effectively improving the test efficiency, reducing the labor intensity of operators, and at the same time ensuring the safety and cleanliness of the test site. It solves the problems of poor versatility, easy cable damage and high cost of existing test cable retraction devices, improving the test efficiency and safety. Through the design of an adjustable locking device, it can adapt to various specifications of cables. The clamping surface is wrapped with flexible materials to reduce cable wear. At the same time, the device has a compact structure, and the selected materials are economical and durable, significantly reducing the cost. With a high degree of automation, it greatly improves the convenience and efficiency of test operations. The present utility model makes the test site layout more standardized, with clear wiring, facilitating test personnel to judge the connection of test cables. At the same time, its unique modular design makes the assembly and disassembly of the device more simple and fast, improving the test efficiency. The setting of the scroll spring ensures that the cable maintains an appropriate tension during the automatic cable retraction process, effectively preventing the cable from being overly loose or tight, further enhancing the service life of the cable and the accuracy of the test. At the same time, this spring design also facilitates the rapid adjustment of the cable length to meet different test requirements, improving the flexibility and adaptability of the device. The setting of the locking device of the present utility model realizes the stable locking and easy unlocking of the cable through precise mechanical design, effectively avoiding the risk of accidental cable detachment during the test process, ensuring the continuity of the test and the accuracy of data. Its operation is simple, and it can be completed without special tools, reducing the requirements for the skills of operators and improving the overall work efficiency. The present utility model is exquisitely designed, simple in structure, safe and reliable, easy to operate, and highly practical, with high practical application value, good economic benefits and social benefits.

Claims

1. A test cable double-pull automatic take-up device, characterized by: The invention comprises a test cable (1), wherein the test cable (1) is wound around a wire receiver (6), the wire receiver (6) is rotatably mounted in an insulating housing (2), a support column (7) is fixed at the center of the insulating housing (2), the wire receiver (6) is fixed between the center support column (7) and the insulating housing (2), the insulating housing (2) is provided with two outlets, two ends of the test cable (1) extend from the two outlets of the insulating housing (2), the two outlets of the insulating housing (2) are both provided with locking devices (4) for locking the extension of the test cable (1), and a spiral spring (5) is wound and mounted between the center support column (7) and the wire receiver (6).

2. A test cable double-pull automatic take-up device according to claim 1, characterized in that: The insulating housing (2) comprises an upper cover (21) and a lower cover (22) which are buckled together, and the centers of the upper cover (21) and the lower cover (22) are connected and fixed as a whole by a central support column (7).

3. A test cable double-pull automatic take-up device according to claim 2, characterized in that: The wire receiver (6) is sleeved on the central support column (7), and a scroll spring (5) is wound around the central support column (7). One end of the scroll spring (5) is connected to the central support column (7), and the other end is fixed to the wire receiver (6) with a hook.

4. The double-pull automatic wire-winding device for testing cables according to claim 3 is characterized in that: The wire holder (6) is provided in a cylindrical shape, a hole is provided at the center of the bottom of the cylinder, a spring baffle (8) is provided on the circumference of the center hole in the middle of the cylinder, an outer cylinder body (9) is provided on the outer ring of the cylinder, and at least three notches are provided on the outer cylinder body (9), namely a first notch (10), a second notch (11) and a third notch (12).

5. The double-pull automatic wire-winding device for testing cables according to claim 4 is characterized in that: The scroll spring (5) is sleeved and fixed on the central support column (7), is wound out from the first notch (10) of the outer cylinder (9), is wound around the outer surface of the outer cylinder (9) of the wire receiving device (6), and is hooked and fixed at the second notch (11) of the outer cylinder (9).

6. A test cable double-pull automatic take-up device according to claim 5, characterized in that: The middle part of the test cable (1) is wound in the annular groove between the spring baffle (8) and the outer cylinder (9) of the cable receiving device (6), one end is wound out from the third notch (12) of the outer cylinder (9) and wound around the outer cylinder (9) of the cable receiving device (6), and the other end is wound out from the second notch (11) of the outer cylinder (9) and also wound around the outer cylinder (9) of the cable receiving device (6). Both ends of the test cable (1) are wound around the outer cylinder (9) of the cable receiving device (6) in layers and in the same direction.

7. The double-pull automatic wire-winding device for testing cables according to claim 6, characterized in that: The test cable (1) is provided with wiring terminals (3) at both ends. The two ends of the test cable (1) are respectively wound around the outer cylinder (9) of the wire holder (6) and then wound out from the two outlets of the insulating shell (2). The wiring terminals (3) at both ends hang outside the outlets. The two outlets of the two insulating shells (2) are both equipped with locking devices (4). The two outlets of the insulating shells (2) are equipped with long slot-shaped mounting holes, in which the locking devices (4) are installed.

8. The double-pull automatic wire-winding device for testing cables according to claim 7, characterized in that: The locking device (4) comprises an arc-shaped compression spring (13) mounted on one side of the outlet of the test cable (1) of the insulating housing (2), and a button assembly (14) slidably mounted in the installation hole on the other side. The button assembly (14) slides along the installation hole and compresses and locks the test cable (1) with the compression spring (13) at the front end. When the button assembly (14) moves backward, the button assembly (14) and the compression spring (13) are released to release the test cable (1).

9. The double-pull automatic wire-winding device for testing cables according to claim 8, characterized in that: The button assembly (14) comprises a button (141), a rear end of the button (141) being provided with a stopper (142) to prevent the button assembly (14) from falling out of the mounting hole when the button assembly (14) slides forward along the mounting hole, a lower plane of the button (141) being arranged as an inclined plane, a front end having a small opening with the pressing spring sheet (13), and a rear end having a large opening, a locking block (143) being arranged at the front end of the button (141), and a reverse cone being arranged at the front end of the locking block (143) to lock the test cable (1).

10. A test cable double-pull automatic take-up device according to claim 9, characterized in that: The button (141), the anti-slip sheet (142) and the lower plane of the locking block (143) of the button assembly (14) are all provided with a rubber protective layer to reduce wear on the test cable (1).

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