DAC high-speed cable branching fixing tool
By designing a DAC high-speed cable splitter and fixing fixture, and utilizing a combination of base, wire groove, positioning groove and limit block, the problem of inconsistent position caused by the cross distribution of wire cores is solved, and the accurate positioning and convenient operation of the cable clamp are achieved.
Patent Information
- Application Number
- CN202423095730.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-13
AI Technical Summary
When splitting existing DAC high-speed cables, the cross-distribution of the wire cores causes each cable clamp to be in a different position or twisted, making cutting and soldering difficult.
Design a DAC high-speed cable splitter fixing fixture, including a base, cable groove, positioning groove and limiting block. Through the cooperation of cable clamp and limiting block, the twelve wire cores are positioned in a 4-4-4 three-layer configuration. The position accuracy of the cable clamp is ensured by a fine-tuning mechanism and a magnet connection.
It ensures the accuracy of the wiring sequence and the convenience of subsequent cutting and welding, guarantees the fixation and alignment of the cable clamp position, and simplifies the operation process.
Smart Images

Figure CN223567186U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to DAC high -speed cable branch line technical field, concretely relates to a DAC high -speed cable branch line fixed frock. BACKGROUND
[0002] For the DAC high -speed cable assembled, it is composed of two cables with sheaths, and each cable with sheath has six wire cores, when the DAC high -speed cable is branched, twelve wire cores with sheaths are clamped in three layers by three cable clamps in 4-4-4 (that is, each cable clamp clamps four wire cores with sheaths), since there are twelve wire cores, and the wire cores are cross -distributing when branching, after being separated by the cable clamp, each wire core is stressed differently, thereby causing three cable clamp positions to be different or three cable clamps to be distorted, finally making subsequent cutting and welding difficult. SUMMARY
[0003] The utility model provides a DAC high -speed cable branch line fixed frock to overcome the deficiency in the prior art.
[0004] The utility model solves the technical scheme as follows:
[0005] A DAC high -speed cable branch line fixed frock, include: base, the upper surface of base is set up line groove, the upper surface of base is set up one with line groove lead two side of line groove The positioning groove, the upper surface of line groove is parallelly arranged three cable clamps from top to bottom, two cable clamps in the lower part are respectively inserted into two positioning grooves, a limiting block is arranged between the cable clamp in the uppermost and the cable clamp in the middle, the limiting block is connected with the base by switching to press or release the two cable clamps in the lower part, and the cable clamp in the uppermost is limited by the limiting block.
[0006] The utility model has the advantages that:
[0007] The DAC high -speed cable is inserted into the line groove;
[0008] Four wire cores in twelve wire cores in the DAC high -speed cable are clamped by a cable clamp, and the two ends of the cable clamp are respectively inserted into two positioning grooves;
[0009] Another four wire cores in twelve wire cores are clamped by another cable clamp, and the two ends of the cable clamp are also respectively inserted into two positioning grooves, and the two cable clamps in the positioning groove are distributed in the form of over -and -under layering;
[0010] The limiting block is connected with the base to press the two cable clamps in the positioning groove, if the two cable clamps in the positioning groove are removed subsequently, the limiting block can release the two cable clamps;
[0011] Then the remaining four wire cores in the twelve wire cores are clamped by another cable clamp, and the cable clamp is limited by the limiting block, so that the twelve wire cores are positioned in three layers in the form of 4-4-4, and the positions of the three cable clamps are fixed, which not only ensures the accuracy of the wire sequence, but also makes the subsequent cutting and welding very convenient.
[0012] On the basis of the above technical scheme, the utility model further can make improvement as follows.
[0013] Further, the upper surface of the base is provided with a fine adjustment mechanism, the fine adjustment mechanism is connected with the limiting block, and is used to adjust the position of the limiting block along the length direction of the wire groove, and the limiting block is pressed or released by switching the connection state of the fine adjustment mechanism.
[0014] The above further beneficial effects are: the fine adjustment mechanism is used to adjust the position of the limiting block along the length direction of the wire groove, and further ensures the accuracy of the relative position of the cable clamp located at the uppermost position and the two cable clamps located below.
[0015] Further, the fine adjustment mechanism comprises: two adjusting blocks, a stroke groove is formed on the upper surface of the base outside each positioning groove along the length direction of the wire groove, and the two adjusting blocks are arranged in the two stroke grooves respectively, at least one waist-shaped groove is formed on the adjusting block along the length direction of the stroke groove, and the adjusting screw is fixed to the base through the adjusting screw on the waist-shaped groove of the adjusting block.
[0016] The above further beneficial effects are: if the position of the fine adjustment block is required to be adjusted, the adjusting screw is twisted to loosen the adjusting block, and then the position of the adjusting block is adjusted along the length direction of the stroke groove, and when the adjusting is in place, the adjusting screw is twisted to lock the adjusting block, which meets the fine adjustment function and has a simple structure.
[0017] Further, one end of the limiting block is rotatably connected with one of the two adjusting blocks, and the other end of the limiting block is a movable end, and the movable end of the limiting block is detachably connected with the other adjusting block.
[0018] The above further beneficial effects are: when the two cable clamps located below are required to be pressed, the movable end of the limiting block is connected with the other adjusting block, and when the two cable clamps located below are required to be released, the movable end of the limiting block is disconnected with the other adjusting block, which is very convenient.
[0019] Further, the movable end of the limiting block is embedded with a first magnet, and the adjusting block is embedded with a second magnet, the first magnet and the second magnet are opposite magnets, and the movable end of the limiting block and the adjusting block are detachably connected through the attraction of the first magnet and the second magnet.
[0020] The further beneficial effect is that when the movable end of the limiting block contacts the adjusting block, the movable end of the limiting block is connected with the adjusting block by the attraction force of the first magnet and the second magnet, and when it is required to remove the connection state, the staff can easily break it apart.
[0021] Further, the cable clamp comprises a first clamping plate and a second clamping plate, and the first clamping plate and the second clamping plate are fixedly connected by a screw. There are at least four wire passing holes arranged side by side between the first clamping plate and the second clamping plate.
[0022] The further beneficial effect is that the screw is first twisted to relatively loosen the first clamping plate and the second clamping plate, then the four wire cores are inserted into the four wire passing holes, and then the screw is twisted again to relatively lock the first clamping plate and the second clamping plate.
[0023] Further, a limiting groove is formed on the upper surface of the limiting block, and the cable clamp located at the uppermost position is located in the limiting groove and limited by the limiting groove.
[0024] Further, a pressing mechanism is fixed on the base to press the outer sheath area of the DAC high-speed cable located in the wire slot.
[0025] The further beneficial effect is that the DAC high-speed cable clamped in the wire slot can be prevented from moving by the pressing mechanism.
[0026] Further, the pressing mechanism comprises a pressing block and a locking block, and the pressing block and the locking block are arranged on both sides of the wire slot respectively. The middle region of the locking block is rotatably connected with the base, a spring is arranged between the end of the locking block away from the wire slot and the base, one end of the pressing block is rotatably connected with the base, and the other end of the pressing block crosses the wire slot and is pressed by the cooperation of the locking block and the spring.
[0027] The further beneficial effect is that the DAC high-speed cable is clamped in the wire slot and pressed by the cooperation of the pressing block, the locking block and the spring. The pressing block usually presses the outer sheath area of the DAC high-speed cable located in the wire slot. If it is required to unlock, the end of the locking block away from the wire slot is pressed, the other end of the locking block is lifted up, the pressing block is unlocked, and the pressing block can be turned open around the shaft to unlock the DAC high-speed cable. The operation is convenient, and the DAC high-speed cable can be pressed and unlocked conveniently.
[0028] Further, the pressing mechanism further comprises a third magnet and a fourth magnet, and the third magnet and the fourth magnet are embedded in the pressing block and the base respectively. The third magnet and the fourth magnet are same-polarity repelling magnets, the repelling force between the third magnet and the fourth magnet is sufficient to lift up the pressing block, and the repelling force cannot be greater than the locking force of the spring on the locking block.
[0029] The further beneficial effect is that when the other end of the lock block is lifted to release the pressure on the wire pressing block, the wire pressing block is automatically opened around the shaft by repulsion between the third magnet and the fourth magnet to release the pressure on the DAC high-speed cable. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 It is a first perspective view of the DAC high-speed cable branch fixing tool in the utility model.
[0031] Figure 2 It is a second perspective view of the DAC high-speed cable branch fixing tool in the utility model.
[0032] Figure 3 It is a structure diagram of the DAC high-speed cable branch fixing tool after removing the uppermost cable clamp and the limiting block.
[0033] Figure 4 It is a first cross-sectional view of the DAC high-speed cable branch fixing tool in the utility model.
[0034] Figure 5 It is a second cross-sectional view of the DAC high-speed cable branch fixing tool in the utility model.
[0035] Figure 6 It is an application diagram of the DAC high-speed cable branch fixing tool in the utility model.
[0036] In the drawings, the components represented by each reference numeral are listed as follows:
[0037] 1, base, 110, wire slot, 120, positioning groove, 130, stroke groove, 2, cable clamp, 210, first clamping plate, 220, second clamping plate, 230, screw, 240, wire hole, 3, limiting block, 310, limiting groove, 4, fine adjustment mechanism, 410, adjustment block, 411, waist-shaped groove, 412, sunken groove, 420, adjustment screw, 5, first magnet, 6, second magnet, 7, wire pressing mechanism, 710, wire pressing block, 720, lock block, 730, spring, 740, third magnet, 750, fourth magnet, 8, DAC high-speed cable, 810, wire core. DETAILED DESCRIPTION
[0038] The principles and features of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.
[0039] Example 1
[0040] As shown in the drawings, a DAC high-speed cable branch fixing tool comprises: Figures 1-6
[0041] The base 1 is provided with a wire slot 110 on the upper surface of the base 1, and the subsequent DAC high-speed cable will be placed in the wire slot 110 on the base 1. The wire slot 110 does not penetrate the lower surface of the base 1 in the region corresponding to the DAC high-speed cable 8 having an outer sheath, and the wire slot 110 penetrates the lower surface of the base 1 in the region corresponding to the twelve wire cores 810 stripped of the outer sheath in the DAC high-speed cable 8. Of course, the wire slot 110 can also not penetrate the lower surface of the base 1, and it is preferred to penetrate the lower surface of the base 1 for subsequent welding and cutting.
[0042] The base 1 is provided with a wire slot 110 on the upper surface of the base 1, and the subsequent DAC high-speed cable will be placed in the wire slot 110 on the base 1. The wire slot 110 does not penetrate the lower surface of the base 1 in the region corresponding to the DAC high-speed cable 8 having an outer sheath, and the wire slot 110 penetrates the lower surface of the base 1 in the region corresponding to the twelve wire cores 810 stripped of the outer sheath in the DAC high-speed cable 8. Of course, the wire slot 110 can also not penetrate the lower surface of the base 1, and it is preferred to penetrate the lower surface of the base 1 for subsequent welding and cutting.
[0043] The operation steps are as follows:
[0044] The DAC high-speed cable 8 is inserted into the wire slot 110.
[0045] Four of the twelve wire cores 810 in the DAC high-speed cable 8 are clamped with a cable clamp 2, and the two ends of the cable clamp 2 are respectively inserted into the two positioning grooves 120.
[0046] Another four of the twelve wire cores 810 are clamped with another cable clamp 2, and the two ends of the cable clamp 2 are also respectively inserted into the two positioning grooves 120. The two cable clamps 2 in the positioning grooves 120 are arranged in a top-down stacking manner.
[0047] The limiting block 3 is connected with the base 1 to press the two cable clamps 2 in the positioning grooves 120. If the two cable clamps 2 in the positioning grooves 120 are removed subsequently, the limiting block 3 can be released to press the two cable clamps 2.
[0048] The remaining four of the twelve wire cores 810 are clamped with another cable clamp 2, and the cable clamp 2 is limited by the limiting block 3, so as to complete the positioning of the twelve wire cores 810 in three layers in the form of 4-4-4, and also complete the fixing of the positions of the three cable clamps 2. This not only ensures the accuracy of the wire sequence, but also makes the subsequent cutting and welding very convenient.
[0049] Embodiment 2
[0050] As shown in Figure 1 , Figure 2 , this embodiment is a further improvement based on embodiment 1, and the specific improvements are as follows:
[0051] The base 1 upper surface is provided with a fine adjustment mechanism 4, and the fine adjustment mechanism 4 is connected with the limiting block 3, the fine adjustment mechanism 4 is used to adjust the position of the limiting block 3 along the length direction of the line groove 110, further ensure the accuracy of the relative position of the uppermost cable clamp 2 and the two cable clamps 2 below, the limiting block 3 is pressed or released by switching the connection state of the fine adjustment mechanism 4.
[0052] Embodiment 3
[0053] As shown in Figure 1 , Figure 2 , this embodiment is further improved on the basis of embodiment 2, as follows:
[0054] The fine adjustment mechanism 4 includes: two adjusting blocks 410, the base 1 upper surface is provided with a travel groove 130 outside each positioning groove 120, each travel groove 130 is distributed along the length direction of the line groove 110, and the two adjusting blocks 410 are arranged in the two travel grooves 130 respectively, at least one waist-shaped groove 411 is formed on each adjusting block 410 along the length direction of the travel groove 130, the adjusting block 410 is fixed with the base 1 through the adjusting screw 420, and the adjusting screw 420 is in the waist-shaped groove 411 on the adjusting block 410, if the position of the adjusting block 410 needs to be fine adjusted, the adjusting screw 420 is loosened to adjust the position of the adjusting block 410 along the length direction of the travel groove 130, and when the adjusting is in place, the adjusting screw 420 is tightened to lock the adjusting block 410, which meets the fine adjustment function and has a simple structure.
[0055] The number of waist-shaped grooves 411 on each adjusting block 410 can be one, two, three, etc., and the number of waist-shaped grooves 411 on each adjusting block 410 in this embodiment is preferably two, so that each adjusting block 410 is fixedly connected with the base 1 through two adjusting screws 420, which can avoid the rotation of the adjusting block 410 when the position of the adjusting block 410 is fine adjusted.
[0056] A sunken groove 412 coaxial with each waist-shaped groove 411 is formed on the adjusting block 410, and the nut of the adjusting screw 420 is in the sunken groove 412, which can hide the nut of the adjusting screw 420.
[0057] Embodiment 4
[0058] As shown in Figure 1 , Figure 2 , Figure 4 , this embodiment is further improved on the basis of embodiment 3, as follows:
[0059] One end of the limiting block 3 is rotatably connected with one of the two adjusting blocks 410, specifically, the one end of the limiting block 3 can be rotatably connected with one adjusting block 410 through a rotating shaft, the other end of the limiting block 3 is a movable end, and the movable end of the limiting block 3 is detachably connected with the other adjusting block 410 of the two adjusting blocks 410, when it is required to press the two cable clamps 2 below, the movable end of the limiting block 3 is connected with the other adjusting block 410, and when it is required to release the two cable clamps 2 below, the movable end of the limiting block 3 is detached from the other adjusting block 410, which is very convenient.
[0060] Embodiment 5
[0061] As shown in the figure, the embodiment is a further improvement on the basis of embodiment 4, specifically as follows: Figure 4
[0062] The movable end of the limiting block 3 is embedded with a first magnet 5, and the adjusting block 410 is embedded with a second magnet 6, the first magnet 5 and the second magnet 6 are opposite magnets, and the movable end of the limiting block 3 and the adjusting block 410 are detachably connected through the attraction of the first magnet 5 and the second magnet 6, when the movable end of the limiting block 3 contacts the adjusting block 410, the movable end of the limiting block 3 is connected with the adjusting block 410 by the attraction of the first magnet 5 and the second magnet 6, when it is required to release the connection state, the staff can detach it by force, of course, other structures can also be used to realize the detachable connection of the movable end of the limiting block 3 and the adjusting block 410 in the actual design process, such as clamping, screw connection and the like.
[0063] Embodiment 6
[0064] As shown in the figure, the embodiment is a further improvement on the basis of any one of embodiments 1-5, specifically as follows: Figure 1 Figure 2 Figure 3 Figure 4 As shown in the figure, the embodiment is a further improvement on the basis of any one of embodiments 1-5, specifically as follows:
[0065] The cable clamp 2 comprises a first clamping plate 210 and a second clamping plate 220, the first clamping plate 210 and the second clamping plate 220 are fixedly connected through a screw 230, and there are at least four parallelly distributed wire passing holes 240 between the first clamping plate 210 and the second clamping plate 220, since each cable clamp 2 requires to clamp four wire cores, each cable clamp 2 has at least four wire passing holes 240, and the working mode is as follows: first, the screw 230 is twisted to relatively loosen the first clamping plate 210 and the second clamping plate 220, then four wire cores are inserted into the four wire passing holes 240 correspondingly, and then the screw 230 is twisted to relatively lock the first clamping plate 210 and the second clamping plate 220.
[0066] Embodiment 7
[0067] As Figure 1 shown, the embodiment is further improved on the basis of embodiment 6, as follows:
[0068] A limiting groove 310 is formed on the upper surface of the limiting block 3, and the uppermost cable clamp 2 is located in the limiting groove 310 and is limited by the limiting groove 310, which can effectively limit the uppermost cable clamp 2, and the cooperation between them is simple, and the disassembly and assembly are convenient.
[0069] Embodiment 8
[0070] As Figure 1 , Figure 2 , Figure 5 shown, the embodiment is further improved on the basis of any one of embodiments 1-7, as follows:
[0071] A wire pressing mechanism 7 is fixed on the base 1 to press the outer sheath area of the DAC high-speed cable in the wire slot 110, and the DAC high-speed cable in the wire slot 110 can be prevented from moving by the wire pressing mechanism 7.
[0072] Embodiment 9
[0073] As Figure 5 shown, the embodiment is further improved on the basis of embodiment 8, as follows:
[0074] The wire pressing mechanism 7 includes a wire pressing block 710 and a lock block 720, the wire pressing block 710 and the lock block 720 are respectively arranged on both sides of the wire slot 110, the middle region of the lock block 720 is rotationally connected with the base 1, specifically, the middle region of the lock block 720 can be rotationally connected with the base 1 through a rotating shaft, a spring 730 is arranged between the end of the lock block 720 away from the wire slot 110 and the base 1, one end of the wire pressing block 710 is rotationally connected with the base 1, specifically, one end of the wire pressing block 710 can be rotationally connected with the base 1 through a rotating shaft, the other end of the wire pressing block 710 crosses the wire slot 110 and is pressed by the cooperation of the lock block 720 and the spring 730, the spring 730 relies on the elastic force to give the end of the lock block 720 away from the wire slot 110 an upward force, so the other end of the lock block 720 will have a downward movement trend, that is, it can press the wire pressing block 710 below it, at this time, the wire pressing block 710 will press the outer sheath area of the DAC high-speed cable 8 in the wire slot 110, if it is required to be unlocked, press the end of the lock block 720 away from the wire slot 110, so that the other end of the lock block 720 is raised to release the pressing of the wire pressing block 710, the wire pressing block 710 can be rotated away around the shaft to release the pressing of the DAC high-speed cable 8.
[0075] In the embodiment, the end of the wire pressing block 710 has a slope, and a horizontal flat section is arranged at the bottom of the slope, and the locking block 720 is pressed on the flat section of the wire pressing block 710.
[0076] Furthermore, the wire pressing mechanism 7 further comprises a third magnet 740 and a fourth magnet 750, which are embedded in the wire pressing block 710 and the base 1 respectively, the third magnet 740 and the fourth magnet 750 are same-polarity repelling magnets, the repelling force between the third magnet 740 and the fourth magnet 750 is sufficient to pop up the wire pressing block 710, and cannot be greater than the locking force formed by the spring 730 on the locking block 720, when the other end of the locking block 720 is lifted to release the pressing on the wire pressing block 710, the wire pressing block 710 is automatically popped open around the shaft to release the pressing on the DAC high-speed cable 8 by the repelling force between the third magnet 740 and the fourth magnet 750.
[0077] Of course, other structures can also be used as the wire pressing mechanism 7 in the actual design process, for example, only one wire pressing block is contained, one end of the wire pressing block is rotatably connected with the base 1, and the other end of the wire pressing block is detachably connected with the base after crossing the wire slot 110, and the detachable connection can be clamping, screw connection, etc.
[0078] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and cannot be understood as the limitation of the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.
Claims
1. A DAC high-speed cable breakout fixture, characterized in that, It includes: The base (1), the upper surface of the base (1) is provided with a wire slot (110), the upper surface of the base (1) is provided with a positioning slot (120) on both sides of the wire slot (110), the wire slot (110) is sequentially arranged in parallel from top to bottom, the two ends of the lower two cable clamps (2) are respectively clamped into the two positioning slots (120), a limiting block (3) is arranged between the uppermost cable clamp (2) and the middle cable clamp (2), the limiting block (3) is connected with the base (1) by switching to press or release the lower two cable clamps (2), the uppermost cable clamp (2) is limited by the limiting block (3).
2. The DAC high-speed cable breakout fixture of claim 1, wherein, The upper surface of the base (1) is provided with a fine adjustment mechanism (4), the fine adjustment mechanism (4) is connected with the limiting block (3), and the position of the limiting block (3) is adjusted along the length direction of the wire slot (110), the limiting block (3) is connected with the fine adjustment mechanism (4) by switching to press or release the lower two cable clamps (2).
3. The DAC high-speed cable breakout fixture of claim 2, wherein, The fine adjustment mechanism (4) includes: two adjusting blocks (410), the upper surface of the base (1) is provided with a travel slot (130) on the outside of each positioning slot (120) along the length direction of the wire slot (110), two adjusting blocks (410) are arranged in the two travel slots (130) respectively, at least one waist-shaped slot (411) is formed on the adjusting block (410) along the length direction of the travel slot (130), the adjusting screw (420) is fixed on the base (1) through the adjusting block (410), and the adjusting screw (420) is located in the waist-shaped slot (411) on the adjusting block (410).
4. The DAC high-speed cable breakout fixture of claim 3, wherein, One end of the limiting block (3) is rotatably connected with one of the two adjusting blocks (410), the other end of the limiting block (3) is a movable end, and the movable end of the limiting block (3) is detachably connected with the other adjusting block (410).
5. The DAC high-speed cable breakout fixture of claim 4, wherein, The movable end of the limiting block (3) is embedded with a first magnet (5), a second magnet (6) is embedded on the adjusting block (410), the first magnet (5) and the second magnet (6) are opposite magnets, and the movable end of the limiting block (3) and the adjusting block (410) are detachably connected through the attraction of the first magnet (5) and the second magnet (6).
6. The DAC high-speed cable breakout fixture of claim 1, wherein, The cable clamp (2) includes: a first clamping plate (210) and a second clamping plate (220), the first clamping plate (210) and the second clamping plate (220) are fixedly connected through a screw (230), and at least four wire passing holes (240) are arranged in parallel between the first clamping plate (210) and the second clamping plate (220).
7. The DAC high-speed cable breakout fixture of claim 6, wherein, A limiting slot (310) is formed on the upper surface of the limiting block (3), and the uppermost cable clamp (2) is located in the limiting slot (310) and is limited by the limiting slot (310).
8. The DAC high-speed cable breakout fixture of claim 1, wherein, The base (1) is fixed with a wire pressing mechanism (7) for pressing the outer sheath area of the DAC high-speed cable in the wire slot (110).
9. The DAC high-speed cable breakout fixture of claim 8, wherein, The wire pressing mechanism (7) comprises a wire pressing block (710) and a lock block (720), the wire pressing block (710) and the lock block (720) are arranged on both sides of the wire slot (110) respectively, the middle area of the lock block (720) is rotationally connected with the base (1), a spring (730) is arranged between the end of the lock block (720) away from the wire slot (110) and the base (1), one end of the wire pressing block (710) is rotationally connected with the base (1), the other end of the wire pressing block (710) crosses the wire slot (110) and is pressed by the cooperation of the lock block (720) and the spring (730).
10. The DAC high-speed cable breakout fixture of claim 9, wherein, The wire pressing mechanism (7) further comprises a third magnet (740) and a fourth magnet (750), the third magnet (740) and the fourth magnet (750) are embedded on the wire pressing block (710) and the base (1) respectively, the third magnet (740) and the fourth magnet (750) are same-polarity repelling magnets, the repelling force between the third magnet (740) and the fourth magnet (750) is sufficient to pop up the wire pressing block (710) and cannot be greater than the locking force formed by the spring (730) on the lock block (720).