Current end chuck for measuring resistance of cable conductor
By using a cable conductor resistance measuring clamp with manual control and a secondary force application mechanism, the problem of cable damage and loosening caused by improper clamping force was solved, and stable and reliable cable conductor resistance measurement was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-03-13
AI Technical Summary
Existing cable conductor resistance measuring clamps can damage cables when the clamping force is too high, and loosen when the clamping force is too low, resulting in inaccurate test data.
The current-end chuck, which uses manual control of clamping force, combined with a secondary force-applying mechanism, achieves precise control and self-locking of clamping force through a worm gear structure, thus avoiding sudden changes in clamping force.
It effectively avoids damage to the cable conductor, ensures clamping stability, and improves the accuracy of test data.
Smart Images
Figure CN223992909U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cable conductor resistance measuring equipment, and in particular to a current terminal clamp for measuring cable conductor resistance. Background Technology
[0002] A cable is a device used for transmitting electrical energy or signals, typically composed of several or groups of stranded conductors. The conductors are further reinforced with an insulating layer to enhance insulation. The conductivity of the cable conductor directly affects transmission efficiency and signal quality. Therefore, it is necessary to test the resistance value of the cable conductor to meet design requirements and usage needs. Currently, cable conductor clamps used for testing typically employ an electrically driven clamping method. However, excessive clamping force can damage the cable conductor, while insufficient clamping force can cause it to loosen during resistance testing, leading to inaccurate data. Therefore, a current-end clamp for cable conductor resistance measurement is needed to address these issues. Utility Model Content
[0003] In response to the above situation and to overcome the shortcomings of the existing technology, this device provides a current terminal clamp for measuring the resistance of cable conductors. This device effectively avoids cable damage caused by excessive clamping force by manually controlling the clamping force of the clamp. At the same time, it adopts a secondary force application method to increase the clamping effect on the cable conductor, which has the advantages of good clamping effect and high cable clamping protection.
[0004] The purpose of this utility model is to provide a current terminal clamp for measuring the resistance of cable conductors, including a base plate, side plates fixedly connected to the top of both sides of the base plate, and upright plates fixedly connected to the front and rear ends of the two side plates. Two parallel sliding shafts are fixedly connected between the upright plates, and tightening mechanisms parallel to the two sliding shafts are rotatably connected between the upright plates. A bidirectional sliding mechanism is slidably connected to the sliding shafts, and the tightening mechanism controls the bidirectional sliding mechanism to move synchronously inward or outward. A clamp is fixedly connected to the inner side of the bidirectional sliding mechanism. A secondary force-applying mechanism is slidably connected to the front end of the two side plates, and the bottom of the secondary force-applying mechanism is connected to the top of the tightening mechanism. A one-way locking mechanism for one-way locking of the secondary force-applying mechanism is vertically slidably connected inside the right side plate.
[0005] Furthermore, the bidirectional sliding mechanism includes two moving blocks. A threaded sleeve and two first sleeves are embedded at the bottom of the two moving blocks. The threaded sleeve is disposed between the two first sleeves. The two moving blocks are slidably connected to the sliding shaft through the two first sleeves respectively. At the same time, the two moving blocks are connected to the tightening mechanism through the threaded sleeves respectively. A clamp is fixedly connected to the inner side of each moving block.
[0006] Furthermore, the tightening mechanism includes two threaded rods with opposite thread directions and coaxially fixedly connected. The rear ends of the two threaded rods are rotatably connected to the rear end plate. The front part of the front threaded rod extends to the outside of the front end plate and is coaxially fixedly connected to the first handwheel. The two threaded rods are respectively threadedly connected to the two moving blocks with two threaded sleeves.
[0007] Furthermore, the secondary force-applying mechanism includes a worm gear, which is coaxially fixedly connected to the radial direction of the front threaded rod. A worm is meshed on the top of the worm gear, and a second sleeve is coaxially sleeved at both ends of the worm. The worm is slidably connected to two side plates through the second sleeve, wherein a second handwheel is fixedly connected to the right side plate at one end of the worm.
[0008] Furthermore, the one-way locking mechanism includes a sliding hole, which is vertically opened inside the right side plate. A pin is vertically slidably connected inside the sliding hole, and a pull block is horizontally fixedly connected to the top of the pin. An annular pin groove is opened radially on the right side of the worm gear, and the pin is pinned to the annular pin groove.
[0009] Furthermore, a return spring is fixedly connected between the top of the pin and the top of the sliding hole.
[0010] Furthermore, dustproof folding plates are fixedly connected to the top of the two movable blocks respectively, and the other end of the dustproof folding plates is fixedly connected to the top of the corresponding front and rear upright plates respectively.
[0011] Furthermore, multiple staggered arc-shaped clamping teeth are fixedly connected to the inner sides of the two clamps.
[0012] The working principle and usage principle of this utility model are as follows: The tightening mechanism controls the two moving blocks within the bidirectional sliding mechanism to move inward synchronously, causing the clamps on the inner sides of the two moving blocks to contact the surface of the cable to be tested and clamp and fix the cable conductor. At this time, the clamping force of the two clamps on the cable conductor is sufficient to hold the cable conductor without loosening it. Subsequently, the worm is pushed into the device from right to left using the second handwheel. Rotating the second handwheel causes the worm to mesh with the worm wheel. When the worm wheel and worm are fully engaged, the pin in the one-way locking mechanism is released by the spring force of the return spring. The bottom end is inserted into the annular pin groove on the radial side of the worm gear. Then, the second handwheel is continuously rotated. The rotation of the second handwheel drives the worm gear to rotate, which in turn drives the worm wheel to rotate. When the worm wheel rotates, the two threaded rods with opposite thread directions, which are fixedly connected to the worm wheel on the same axis, control the two moving blocks to move inward synchronously through the threaded sleeve at the bottom of the moving block. This achieves a secondary force application to the cable conductor. During this secondary force application, the speed of the moving blocks moving inward synchronously is reduced by the deceleration of the worm wheel and worm gear, thereby avoiding damage to the cable conductor due to sudden excessive clamping force.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. Compared with the prior art, this utility model achieves the clamping of the cable conductor by manually controlling the rotation of the tightening mechanism and using two clamps on the bidirectional sliding mechanism. This makes it easier to manually feel the clamping resistance of the cable conductor when clamping it, thus avoiding damage to the cable conductor caused by excessive clamping force from the two clamps.
[0015] 2. Compared with the prior art, the present invention further increases the clamping force of the two clamps on the cable conductor through the secondary force-applying mechanism, which prevents the cable conductor from loosening during resistance measurement and increases the clamping stability of the device on the cable conductor. At the same time, the secondary force-applying mechanism self-locks the tightening mechanism to prevent the clamps from loosening after the cable conductor is clamped. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the current terminal clamp for measuring the resistance of cable conductors according to this utility model;
[0017] Figure 2 This is a side view of the current terminal clamp for measuring the resistance of cable conductors according to this utility model.
[0018] Figure 3 This is a schematic diagram of the top structure of the current terminal clamp for measuring the resistance of cable conductors according to this utility model;
[0019] Figure 4 This is a schematic diagram of the one-way locking mechanism of the current end clamp for measuring the resistance of cable conductors according to this utility model.
[0020] Explanation of reference numerals in the attached drawings: 1. Side plate; 2. Vertical plate; 3. Sliding shaft; 4. Bidirectional sliding mechanism; 41. Moving block; 42. First sleeve; 5. Chuck; 6. Tightening mechanism; 61. Threaded rod; 62. First handwheel; 63. Threaded sleeve; 7. Secondary force-applying mechanism; 71. Worm gear; 72. Worm; 73. Second handwheel; 74. Through hole; 75. Second sleeve; 8. One-way locking mechanism; 81. Pin; 82. Pull block; 83. Return spring; 84. Annular pin groove; 9. Dustproof folding plate. Detailed Implementation
[0021] To make the technical means, creative features, objectives and effects of the embodiments of this application easier to understand, the embodiments of this application are further described below in conjunction with the figures and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of this application and are not intended to limit the embodiments of this application.
[0022] according to Figures 1 to 4As shown, the current terminal clamp 5 for measuring the resistance of cable conductors includes a base plate, with side plates 1 fixedly connected to the top of both sides of the base plate, and upright plates 2 fixedly connected to the front and rear ends of the two side plates 1 respectively. Two parallel sliding shafts 3 are fixedly connected between the upright plates 2, and tightening mechanisms 6, which are parallel to the two sliding shafts 3, are rotatably connected between the upright plates 2. A bidirectional sliding mechanism 4 is slidably connected to the sliding shafts 3. The tightening mechanism 6 controls the bidirectional sliding mechanism 4 to move synchronously inward or outward. Clamps 5 are fixedly connected to the inner side of the bidirectional sliding mechanism 4. A secondary force-applying mechanism 7 is slidably connected to the front end of the two side plates 1. The bottom of the secondary force-applying mechanism 7 is connected to the top of the tightening mechanism 6. A one-way locking mechanism 8, which is unidirectionally locked by the secondary force-applying mechanism 7, is vertically slidably connected inside the right side plate 1.
[0023] In practical implementation, the top of the base plate is fixedly connected to two side plates 1 and front and rear upright plates 2. Two parallel sliding shafts 3 are horizontally fixedly connected between the front and rear upright plates 2. The tightening mechanism 6 controls the bidirectional sliding mechanism 4 to move linearly on the two sliding shafts 3. The two sliding shafts 3 can restrict the movement direction of the bidirectional sliding mechanism 4. Clamps 5 are fixedly connected to the inner side of the bidirectional sliding mechanism 4. When the closing mechanism controls the bidirectional sliding mechanism 4 to move inward synchronously, the clamps 5 clamp and fix the cable conductor. The secondary force-applying mechanism 7 can move axially left and right at its front end between the two side plates 1. In the initial state, the secondary force-applying mechanism 7 is in the mounting position. When placed on the right side, the secondary force-applying mechanism 7 disengages from the tightening mechanism 6. After the closing mechanism controls the bidirectional sliding mechanism 4 to pre-tighten the cable conductor, the secondary force-applying mechanism 7 is pushed from right to left. Then, the secondary force-applying mechanism 7 is rotated to engage with the tightening mechanism. Subsequently, the secondary force-applying mechanism 7 is rotated to engage with the closing mechanism, and the position of the secondary force-applying mechanism 7 is restricted by the one-way locking mechanism 8. Then, the tightening mechanism 6 is rotated by the secondary force-applying mechanism 7, and the bidirectional sliding mechanism 4 is further slid and tightened by the closing mechanism, further increasing the clamping effect of the clamp 5 on the cable conductor.
[0024] Furthermore, the bidirectional sliding mechanism 4 includes two moving blocks 41. A threaded sleeve 63 and two first sleeves 42 are embedded at the bottom of the two moving blocks 41. The threaded sleeve 63 is disposed between the two first sleeves 42. The two moving blocks 41 are slidably connected to the sliding shaft 3 through the two first sleeves 42 respectively. At the same time, the two moving blocks 41 are connected to the tightening mechanism 6 through the threaded sleeve 63 respectively. A clamp 5 is fixedly connected to the inner side of the moving blocks 41 respectively.
[0025] In practical implementation, the two first sleeves 42 at the bottom of the two moving blocks 41 are slidably connected to the two ends of the corresponding sliding shafts 3, and the threaded sleeves 63 at the bottom of the two moving blocks 41 are threadedly connected to the tightening mechanism 6. In use, by rotating the tightening mechanism 6, the two moving blocks 41 are controlled to synchronously contract inward or open outward on the two sliding shafts 3. The two moving blocks 41 that contract inward or open outward synchronously drive the clamps 5 to move synchronously. Thus, when the two moving blocks 41 contract synchronously, the distance between the two clamps 5 is shortened, thereby achieving the clamping and fixing of the cable conductor. Conversely, when the two moving blocks 41 open synchronously, the distance between the two clamps 5 is increased, thereby eliminating the clamping effect on the cable conductor.
[0026] Furthermore, the tightening mechanism 6 includes two threaded rods 61 with opposite thread directions and coaxially fixedly connected. The rear ends of the two threaded rods 61 are rotatably connected to the rear end plate 2. The front part of the front threaded rod 61 extends to the outside of the front end plate 2 and is coaxially fixedly connected to a first handwheel 62. The two threaded rods 61 are respectively threadedly connected to two moving blocks 41 with two threaded sleeves 63.
[0027] In practical implementation, the two threaded rods 61 with opposite thread directions are threadedly connected to the threaded sleeves 63 at the bottom of the two moving blocks 41. By rotating the first handwheel 62 located outside the front end plate 2, the two coaxially fixed threaded rods 61 are driven to rotate axially in sync. The two axially rotating threaded rods 61 drive the clamps 5 on the inner side of the two moving blocks 41 to retract inward or open outward in sync. The tightening mechanism 6 can pre-clamp and fix the cable conductor, avoiding excessive clamping force on the cable conductor during the first application of force, which would cause damage to the cable conductor. This increases the protection effect when clamping the cable conductor and also facilitates the secondary force application mechanism 7 to further increase the clamping force of the two clamps 5 on the cable conductor.
[0028] Furthermore, the secondary force-applying mechanism 7 includes a worm gear 71, which is coaxially fixedly connected to the radial direction of the front threaded rod 61. A worm 72 is meshed on the top of the worm gear 71, and a second sleeve 75 is coaxially sleeved at both ends of the worm 72. The worm 72 is slidably connected to the two side plates 1 through the second sleeve 75. The right end of the worm 72 extends to the outside of the right side plate 1 and is fixedly connected to a second handwheel 73.
[0029] In the initial state, the worm gear 71 and worm 72 are not engaged. Two vertical plates 2 each have through holes 74 to accommodate the two ends of the worm 72, allowing the worm 72 to slide left and right between the two vertical plates 2. When a secondary force is needed to clamp the cable conductor, the second handwheel 73 is pushed from right to left. The movement of the second handwheel 73 causes the worm 72 to move from right to left within the vertical plate 2. At this point, the worm gear 71 and worm 72 are about to engage. Then, the worm 72 is rotated, and under continuous rotation, it first engages with the worm gear 71. At this time, the one-way locking mechanism 8 locks the position of the worm 72, preventing it from moving left or right. Next, the second handwheel 73 is rotated, controlling the rotation of the worm 72. The rotation of the worm 72 causes the worm gear 71 to rotate axially. When the worm gear 71 rotates axially, it drives the two threaded rods 61, which are fixedly connected to the worm gear 71 coaxially, to rotate axially. The axial rotation of the two threaded rods 61 controls the two clamps 5 to retract inward synchronously, thereby driving the two clamps 5 to further apply clamping force to the cable conductor. The meshing of the worm gear 71 and the worm 72 facilitates the application of secondary force when clamping the cable conductor, increasing the clamping force of the two clamps 5 on the cable conductor. At the same time, due to the meshing of the worm gear 71 and the worm 72, the worm 72 drives the worm gear 71 to rotate, thereby reducing the speed of the worm gear 71. This allows for more precise control of the clamping force of the two clamps 5. Furthermore, the self-locking effect of the worm gear 71 and the worm 72 ensures that the two clamps 5 can continuously clamp the cable conductor without external force after clamping and fixing it, thus improving the clamping effect of the cable conductor.
[0030] Furthermore, the one-way locking mechanism 8 includes a sliding hole, which is vertically opened inside the right side plate 1. A pin 81 is vertically slidably connected inside the sliding hole. A pull block 82 is horizontally fixedly connected to the top of the pin 81. An annular pin groove 84 is radially opened on the right side of the worm gear 72, and the pin 81 is pinned to the annular pin groove 84.
[0031] In the initial state, because the worm 72 is located on the right side between the vertical plates 2, the pin 81 is not engaged with the annular pin groove 84 at this time. When the worm 72 is pushed from right to left by the second handwheel 73, the bottom end of the pin 81 falls into the radial annular pin groove 84 of the worm 72, thereby restricting the left and right movement of the pin 81 and preventing the worm 72 from moving left and right. The setting of the annular pin groove 84 can also prevent the pin 81 from affecting the axial rotation of the worm 72 when it is engaged with the annular pin groove 84.
[0032] When it is necessary to unlock the clamp 5 to hold the cable conductor, first rotate the worm 72 in the opposite direction to disengage the worm wheel 71 from the worm 72. Then lift the pull block 82 upward. The pull block 82 drives the pin 81 to move upward so that the bottom end of the pin 81 is disengaged from the annular pin groove 84. Then the worm 72 can continue to be moved from left to right.
[0033] Furthermore, a return spring 83 is fixedly connected between the top of the pin 81 and the top of the sliding hole.
[0034] In practical implementation, the top end of the return spring 83 is fixedly connected to the top end of the sliding hole, and the bottom end of the return spring 83 is fixedly connected to the top end of the pin 81. By utilizing the elastic force of the return spring 83, when the worm gear 72 moves from right to left and the annular pin groove 84 is at the bottom of the pin 81, the pin 81 can be quickly pushed downward into the annular pin groove 84, thereby increasing the speed at which the pin 81 is engaged into the annular pin groove 84 and increasing the locking effect of the one-way locking mechanism 8 on the secondary force application mechanism 7.
[0035] Furthermore, dustproof folding plates 9 are fixedly connected to the top of the two movable blocks 41 respectively, and the other end of the dustproof folding plates 9 is fixedly connected to the top of the corresponding front and rear upright plates 2 respectively.
[0036] In practical implementation, one end of each of the two dustproof baffles 9 is fixedly connected to the top of the front and rear upright plates 2, and the other end is fixedly connected to the top of the corresponding two moving blocks 41. The dustproof baffles 9 facilitate the falling of foreign objects or dust into the gap between the moving blocks 41 and the front and rear upright plates 2 when the moving blocks 41 move, thereby improving the dustproof effect of the device and extending the service life of the device.
[0037] Furthermore, multiple staggered arc-shaped clamping teeth are fixedly connected to the inner sides of the two clamps 5 respectively.
[0038] In practical implementation, the arc-shaped clamping teeth can increase the fit between the clamp 5 and the cable conductor surface, improve the friction between the clamp 5 and the cable conductor after contact, and increase the clamping effect of the clamp 5 on the cable conductor. By having the arc-shaped clamping teeth on the two clamps 5 staggered, the problem of the arc-shaped clamps colliding with each other when clamping cable conductors with smaller diameters is avoided, which makes it impossible to clamp the cable conductor. This improves the practicality of the device for clamping cable conductors of various diameters.
[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A current terminal for cable conductor resistance measurements comprising a base plate, characterised in that: The top of the bottom plate is fixedly connected with side plates (1), the front end and the rear end between the two side plates (1) are fixedly connected with vertical plates (2), the vertical plates (2) are fixedly connected with two parallel sliding shafts (3) between them, the vertical plates (2) are rotatably connected with two tightening mechanisms (6) parallel to the two sliding shafts (3) respectively, the sliding shafts (3) are slidably connected with bidirectional sliding mechanisms (4), the tightening mechanisms (6) control the synchronous inward or outward movement of the bidirectional sliding mechanisms (4), the inner sides of the bidirectional sliding mechanisms (4) are fixedly connected with chuck heads (5) respectively, the front end between the two side plates (1) is slidably connected with a secondary force adding mechanism (7), the bottom of the secondary force adding mechanism (7) is connected with the top of the tightening mechanism (6), and the right side plate (1) is vertically slidably connected with a one-way locking mechanism (8) for one-way locking of the secondary force adding mechanism (7).
2. The current terminal for cable conductor resistance measurement according to claim 1, characterized in that: The bidirectional sliding mechanism (4) comprises two moving blocks (41), the bottom of the two moving blocks (41) is embedded with a threaded sleeve (63) and two first sleeves (42), the threaded sleeve (63) is arranged between the two first sleeves (42), the two moving blocks (41) are slidably connected with the sliding shaft (3) through the two first sleeves (42) respectively, and the two moving blocks (41) are connected with the tightening mechanism (6) through the threaded sleeve (63) respectively.
3. The current terminal for cable conductor resistance measurement according to claim 2, characterized in that: The tightening mechanism (6) comprises two threaded rods (61) which are fixedly connected in opposite screw directions and coaxial centers, the rear ends of the two threaded rods (61) are rotatably connected with the rear vertical plates (2), the front part of the front threaded rod (61) extends to the outside of the front vertical plate (2) and is fixedly connected with a first hand wheel (62) in a coaxial center, and the two threaded rods (61) are threadedly connected with the two moving blocks (41) through the two threaded sleeves (63) respectively.
4. The current terminal for cable conductor resistance measurement according to claim 3, characterized in that: The secondary force adding mechanism (7) comprises a worm gear (71), the worm gear (71) is fixedly connected in a coaxial center on the radial direction of the front threaded rod (61), the top of the worm gear (71) is engaged with a worm shaft (72), the coaxial sleeves of the two ends of the worm shaft (72) are provided with second sleeves (75), the worm shaft (72) is slidably connected with the two side plates (1) through the second sleeves (75), and the right end of the worm shaft (72) extends to the outside of the right side plate (1) and is fixedly connected with a second hand wheel (73).
5. The current terminal for cable conductor resistance measurement according to claim 4, characterized in that: The one-way locking mechanism (8) comprises a sliding hole, the sliding hole is vertically arranged in the right side plate (1), a pin shaft (81) is slidably connected in the sliding hole, the top end of the pin shaft (81) is transversely fixedly connected with a pull block (82), a ring-shaped pin groove (84) is arranged on the radial direction of the right side of the worm shaft (72), and the pin shaft (81) is connected with the ring-shaped pin groove (84).
6. The current terminal for cable conductor resistance measurement according to claim 5, characterized in that: The top of the pin shaft (81) and the top of the sliding hole are fixedly connected with a return spring (83).
7. The current terminal for cable conductor resistance measurement according to claim 2 or 3, characterized in that: The top of the pin shaft (81) and the top of the sliding hole are fixedly connected with a return spring (83).
8. The current terminal for cable conductor resistance measurement according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The top of the pin shaft (81) and the top of the sliding hole are fixedly connected with a return spring (83).
9. The current terminal for cable conductor resistance measurement according to claim 7, characterized in that: The inner sides of the two chuck heads (5) are fixedly connected with a plurality of staggered arc-shaped clamping teeth. The inner sides of the two chuck heads (5) are fixedly connected with a plurality of staggered arc-shaped clamping teeth.