High-stability low-voltage wire tightener

Abstract

The high-stability low-voltage wire tightener comprises an upper pressing plate, a middle pressing plate, a lower pressing plate and a shell, two screws are arranged at the bottom of the upper pressing plate, two middle holes and two lower holes are formed in the middle pressing plate and the lower pressing plate respectively, the screws sequentially penetrate through the middle holes and the lower holes, and locking nuts are connected to the screws; the pre-tightening mechanisms are arranged on the two sides of the lower pressing plate and matched with the two screw rods correspondingly, each pre-tightening mechanism comprises a pre-tightening knob, a follow-up block and a pre-tightening shaft sleeve, the pre-tightening shaft sleeves are installed on the peripheries of the screw rods, a plurality of conical teeth are vertically arranged on the side portions of the pre-tightening shaft sleeves, the two sides of the lower pressing plate are each provided with a circular truncated cone part, and movable cavities are formed in the outer ends of the circular truncated cone parts; a guide hole is formed in the inner end of the movable cavity, the pre-tightening knob is connected to the outer end of the circular truncated cone part, the follow-up block is arranged in the movable cavity, the pre-tightening knob is rotated to drive the follow-up block to axially slide, and a locking convex part is arranged on the follow-up block. When the nut is not screwed tightly or unscrewed, the cable cannot slide and fall off, high-altitude operation of a worker is facilitated, and the safety is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of wire tighteners, and particularly to a low-voltage wire tightener with high stability. Background Art

[0002] Wire tighteners are usually divided into three types: top fixation, side fixation, and terminal fixation. The terminal fixation wire tightener is a special tool used to fix the terminal of the wire in power construction, and is mainly applied to the scenarios of low-voltage overhead insulated line laying along the wall or high-voltage line terminal fixation. Its core function is to achieve the tensioning and insulation protection of the wire through a mechanical structure, ensuring the stability and safety of the line.

[0003] The utility model patent with the application number CN202020918238.3 discloses a terminal wire tightener. When installing it, open the outer cover, screw the nut to the uppermost ends of the first screw rod and the second screw rod, then make the upper pressing plate and the middle pressing plate rotate around the first screw rod respectively, so that the upper pressing plate and the middle pressing plate both disengage from the second screw rod. At this time, place the cable on the lower concave part of the lower pressing plate, rotate the middle pressing plate to make the middle pressing plate return to its position, then place the cable on the concave surface on the upper side of the middle pressing plate, rotate the upper pressing plate to make the upper pressing plate return to its position, tighten the nut, and cover the outer cover, so that the cable passes through and is pressed between the upper pressing plate and the middle pressing plate, and between the middle pressing plate and the lower pressing plate.

[0004] Since the cable is fixed at high altitude, with the above structure, when the nut is not tightened, the cable passing through between the upper pressing plate and the middle pressing plate, and between the middle pressing plate and the lower pressing plate is not subjected to the pressing force, and it is easy to slide or even disengage from the wire tightener during the operation process. The staff needs to pull back the cable again, which is very troublesome, increases the workload, and has certain potential safety hazards; in addition, when disassembling, at the moment of loosening the nut, the cable will instantaneously slide axially and disengage from the wire tightener under the action of the axial tension force, which is prone to safety accidents. Summary of the Invention

[0005] The purpose of the present invention is to provide a low-voltage wire tightener with high stability. The structure of the present invention is stable and reliable. When the nut is not tightened or loosened, the lower pressing plate can be positioned through the pre-tightening mechanism, so that the cable is kept under a certain pressing force, and thus it will not slide off, greatly facilitating the high-altitude operation of the staff and having higher safety at the same time.

[0006] To achieve the above object, the present invention provides the following technical solution: A low-voltage wire tightener with high stability, comprising an upper pressing plate, a middle pressing plate, a lower pressing plate and a housing. Two screws are symmetrically arranged at the bottom of the upper pressing plate. Two middle holes and two lower holes are respectively provided on the middle pressing plate and the lower pressing plate. The screws sequentially penetrate through the middle holes and the lower holes. A locking nut is threadedly connected to the position corresponding to the lower side of the lower pressing plate, and the housing is detachably installed at the lower end of the lower pressing plate to cover the bottom of the screw and the locking nut inside; It also includes a pre-tightening mechanism arranged on both sides of the lower pressing plate and cooperating with the two screws respectively. The pre-tightening mechanism includes a pre-tightening knob, a follower block and a pre-tightening bushing. The pre-tightening bushing is installed on the outer periphery of the screw. A plurality of conical teeth with a horizontal upper end and an inclined lower end are evenly arranged vertically on the side of the pre-tightening bushing. A frustum portion is provided on both sides of the lower pressing plate. An activity cavity is opened at the outer end of the frustum portion. A guide hole with a rectangular cross-section and communicating with the lower hole is opened at the inner end of the activity cavity. The pre-tightening knob is rotatably connected to the outer end of the frustum portion. The follower block is arranged in the activity cavity, and rotating the pre-tightening knob can drive the follower block to axially slide. A locking convex portion that penetrates through the guide hole and extends into the lower hole and cooperates with the conical teeth is provided on the follower block.

[0007] By adopting the above technical solution, after passing the cable through between the upper pressing plate and the middle pressing plate, and between the middle pressing plate and the lower pressing plate, first push the lower pressing plate upward so that the upper pressing plate and the middle pressing plate clamp the cable, and the middle pressing plate and the lower pressing plate clamp the cable. At the same time, the pre-tightening mechanism is always in effect, that is, after manually pushing the lower pressing plate in place upward, operate the pre-tightening knob to make the follower block move inward, prompting the locking convex portion on the follower block to engage with the conical teeth on the pre-tightening bushing, thereby preventing the lower pressing plate from moving downward under the action of its own gravity and the restoring force of the cable itself, resulting in the cable sliding or even falling off due to the reduced pressing force received. Finally, just tighten the locking nut. When disassembling, just operate the pre-tightening knob to make the follower block drive the locking convex portion to disengage from the conical teeth of the pre-tightening bushing, and the locking of the lower pressing plate and the screw can be released. It greatly facilitates the high-altitude operation of the staff and has higher safety at the same time.

[0008] The present invention is further configured such that the pre-tightening mechanism further includes four first magnets and four second magnets. Four first mounting grooves are circumferentially and arrayedly distributed at the inner end of the pre-tightening knob. The four first magnets are respectively embedded in the four first mounting grooves, and the magnetic pole setting directions of every two adjacent first magnets are opposite. A plurality of hemispherical first damping protrusions for restricting the first magnet in the first mounting groove are provided at a position near the outer end of the inner wall of the first mounting groove; four second mounting grooves are circumferentially and arrayedly distributed at the outer end of the follower block. The four second magnets are respectively embedded in the four second mounting grooves, and the magnetic pole setting directions of every two adjacent second magnets are opposite. A plurality of hemispherical second damping protrusions for restricting the second magnet in the second mounting groove are provided at a position near the outer end of the inner wall of the second mounting groove; when the pre-tightening knob is rotated, all the first magnets are in a state of attracting or repelling the corresponding second magnets together.

[0009] By adopting the above technical solution, the initial state is that the first magnet and the second magnet repel each other. At this time, the follower block is located at the innermost end of the movable cavity under the action of the repulsive force, and its locking convex portion is engaged with the tapered teeth on the pre-tightening bushing. At the same time, when the pre-tightening convex portion moves upward relative to the pre-tightening bushing, since the bottom of the tapered teeth is a slope, its upward movement will not be blocked, while the top of the tapered teeth is a horizontal plane, so the lower pressing plate can be prevented from retracting. When disassembly is required, the pre-tightening knob is rotated 90°, so that the first magnet and the second magnet attract each other. At this time, the follower block slides outward under the action of the magnetic attraction force, and its locking convex portion is separated from the tapered teeth on the pre-tightening bushing, thereby releasing the locking of the lower pressing plate and the screw. Moreover, the installation structure of the first magnet and the second magnet is very convenient and has good firmness.

[0010] The present invention is further configured such that the pre-tightening mechanism further includes a pre-tightening spring. A first spring groove is provided at the inner end of the pre-tightening knob, and a second spring groove is provided at the outer end of the follower block. The two ends of the pre-tightening spring are respectively embedded in the first spring groove and the second spring groove.

[0011] By adopting the above technical solution, on the basis of the repulsive force of the magnet, a spring force is added to the follower block through the pre-tightening spring, so that when the locking convex portion abuts against the tapered teeth, it is not easily separated due to shaking, and the reliability of the locking structure is improved.

[0012] The present invention is further configured such that two hemispherical positioning protrusions are provided on the inner circular surface of the pre-tightening knob, and two arc-shaped guide grooves for sliding and positioning the positioning protrusions are provided on the outer circular surface of the frustum portion. The circular angle corresponding to the extending trajectory of the arc-shaped guide groove is 90°, and two suction positioning grooves and separation positioning grooves for embedding the positioning protrusions are respectively provided at both ends of the arc-shaped guide groove, and the depth of the arc-shaped guide groove is less than that of the suction positioning groove and the separation positioning groove.

[0013] By adopting the above technical solution, the positioning effect after the pre-tightening knob rotates 90° can be achieved, which is not only convenient for realizing precise angle adjustment, enabling the perfect attraction or repulsion between the first magnet and the second magnet, but also improving the operating feel.

[0014] The present invention is further configured such that a threaded hole is radially formed in the side portion of the pre-tightening bushing, a slot corresponding to the threaded hole is formed in the side portion of the screw rod, an internal hexagonal stud is threadedly connected to the threaded hole, and the inner end of the internal hexagonal stud is inserted into the slot.

[0015] By adopting the above technical solution, the fixed installation of the bushing and the screw rod can be achieved, the connection structure is simple and reliable, and the disassembly and assembly are very convenient.

[0016] The present invention is further configured such that a plurality of card slots are provided on the outer side of the lower pressing plate, and a plurality of card blocks adapted to the card slots are provided on the inner side of the outer shell.

[0017] By adopting the above technical solution, which is the first connection method between the outer shell and the lower pressing plate, the fixed installation of the outer shell and the lower pressing plate can be achieved, and the disassembly and assembly operations are very convenient.

[0018] The present invention is further configured to further include a locking mechanism for locking the outer shell. The locking mechanism includes an operating component and an ejecting component. The operating component includes a base, a guide sleeve, a locking rod, an operating knob, and a compression spring. A positioning groove is provided at the front of the outer shell. The base is fixedly installed in the positioning groove, and a directional concave portion is formed on the inner side wall of the positioning groove. A directional convex portion adapted to the directional concave portion is provided on the base. The guide sleeve is fixedly installed in the base. A limiting flange extending inward is provided at the front end of the guide sleeve. The locking rod passes through the guide sleeve, and a guide flange in close fit with the inner circular surface of the guide sleeve is provided on the outer circumference of the locking rod. The compression spring is clamped between the guide flange and the limiting flange. An activity frame extending into the outer shell is provided at the bottom of the lower pressing plate. A locking hole is provided on the side portion of the activity frame. An outer hole corresponding to the locking hole is provided on the outer shell. The locking rod passes through the outer hole and cooperates with the locking hole. The outer end of the locking rod is connected to the operating knob. The operating knob drives the locking rod to insert into or withdraw from the locking hole. The ejecting component is arranged in the outer shell. And when the locking rod withdraws from the locking hole instantaneously, the ejecting component acts on the activity frame to separate the outer shell from the lower pressing plate. A top-out inclined surface for pushing the locking rod out when the activity frame extends into the outer shell is further provided at the bottom of the activity frame.

[0019] By adopting the above technical solution, it is the second connection method between the outer shell and the lower pressing plate. When the operating knob of the operating component is in the initial position, the compression spring acts on the guiding flange of the locking rod, causing the locking rod to move inward and insert into the locking hole of the movable frame at the bottom of the lower pressing plate, realizing the locking of the outer shell and the lower pressing plate; when it is necessary to disassemble the outer shell, the locking rod is driven to move outward by the operating knob, and the locking rod disengages from the locking hole of the movable frame at the bottom of the lower pressing plate. At this time, under the action of the ejecting component, the outer shell automatically disengages from the lower pressing plate. This structure can realize the locking of the outer shell and the lower pressing plate, and can also eliminate the hidden danger of loosening of the connection caused by material aging in the first connection method, and the structural reliability is better.

[0020] The present invention is further configured such that a plurality of first arc-shaped convex portions and first arc-shaped concave portions are circumferentially arranged at intervals along the lower end of the operating knob, and a plurality of second arc-shaped convex portions and second arc-shaped concave portions are circumferentially arranged at intervals along the upper end of the base, and the first arc-shaped convex portions and the second arc-shaped concave portions are fitted to each other, and the first arc-shaped concave portions and the second arc-shaped convex portions are fitted to each other.

[0021] By adopting the above technical solution, when the operating knob is rotated, when the first arc-shaped convex portion on the operating knob fits with the second arc-shaped concave portion on the base, and the first arc-shaped concave portion and the second arc-shaped convex portion fit with each other, the locking rod is inserted into the locking hole. When the first arc-shaped convex portion on the operating knob abuts against the second arc-shaped convex portion on the base, the locking rod moves forward and disengages from the locking hole. Locking or unlocking is achieved by rotating the operating knob, and the operation is very convenient, and the structure is more stable and reliable.

[0022] The present invention is further configured such that an annular flange extending outwardly in the circumferential direction is provided at the rear end of the guiding sleeve, and an annular groove adapted to the annular flange is provided at the rear end of the base.

[0023] By adopting the above technical solution, when the base is installed, the effect of tightly fixing the guiding sleeve can be achieved, and the installation operation is very convenient.

[0024] The present invention is further configured such that the ejecting component includes a sleeve, an ejecting rod and an ejecting spring. The sleeve is integrally provided in the outer shell in the vertical direction, the ejecting rod is movably provided in the sleeve in the vertical direction, and the ejecting spring is provided in the sleeve and applies an upward spring force to the ejecting rod, so that the upper end of the ejecting rod abuts tightly against the lower end of the movable frame. At least one sliding hole extending in the vertical direction is provided on the side of the sleeve, and the sliding hole extends to the upper end of the sleeve. A sliding block cooperating with the sliding hole is provided on the side of the ejecting rod, and a damping convex portion for forming an upper stroke limit for the sliding block is provided at a position near the upper end of the inner wall of the sliding hole, and the damping convex portion is in a hemispherical shape.

[0025] By adopting the above technical solution, the telescopic movement of the ejector rod is realized through the change of the force on the ejecting spring. When the movable frame pushes the ejector rod into the sleeve, the ejecting spring is compressed to store energy. At the moment when the ejector rod leaves the locking hole of the movable frame, the ejecting spring releases energy, pushing the movable frame and the upper pressure plate out, and the outer shell moves in the direction away from the upper pressure plate under the reaction force, facilitating the disassembly operation of the outer shell. Description of the Drawings

[0026] Figure 1 Is the overall three-dimensional view of Embodiment 1; Figure 2 Is the overall exploded view of Embodiment 1; Figure 3 Is the overall cross-sectional view of Embodiment 1; Figure 4 Is Figure 3 The enlarged structural schematic diagram of part A in Figure 5 Is the assembly structural schematic diagram of the pre-tightening knob and the first magnet in Embodiment 1; Figure 6 Is the assembly structural schematic diagram of the follower block and the second magnet in Embodiment 1; Figure 7 Is the structural schematic diagram of the lower pressure plate in Embodiment 1; Figure 8 Is the matching structural schematic diagram of the lower pressure plate and the outer shell in Embodiment 1; Figure 9 Is the overall three-dimensional view of Embodiment 2; Figure 10 Is the overall cross-sectional view of Embodiment 2; Figure 11 Is the matching structural schematic diagram of the base and the outer shell in Embodiment 2; Figure 12 Is the first state schematic diagram of the operating component in Embodiment 2; Figure 13 Is the second state schematic diagram of the operating component in Embodiment 2; Figure 14 Is the exploded view of the operating component in Embodiment 2; Figure 15 Is the matching structural schematic diagram of the ejecting component and the movable frame in Embodiment 2.

[0027] In the figure: 1. Upper pressing plate; 2. Middle pressing plate; 3. Lower pressing plate; 4. Outer shell; 5. Screw rod; 6. Middle hole; 7. Lower hole; 8. Locking nut; 9. Pre-tightening mechanism; 10. Pre-tightening knob; 11. Follow-up block; 12. Pre-tightening bushing; 13. Bevel gear; 14. Round table part; 15. Movable cavity; 16. Guide hole; 17. Locking convex part; 18. First magnet; 19. Second magnet; 20. First installation groove; 21. First damping protrusion; 22. Second installation groove; 23. Second damping protrusion; 24. Pre-tightening spring; 25. First spring groove; 26. Second spring groove; 27. Positioning protrusion; 28. Arc-shaped guide groove; 29. Sucking and positioning groove; 30. Separation positioning groove; 31. Screw hole; 32. Slot; 33. Hexagon socket head cap screw; 34. Card slot; 35. Card block; 36. Locking mechanism; 37. Operating component; 38. Ejecting component; 39. Base; 40. Guide sleeve; 41. Locking rod; 42. Operating knob; 43. Compression spring; 44. Positioning groove; 45. Directional concave part; 46. Directional convex part; 47. Limiting flange; 48. Guide flange; 49. Movable frame; 50. Locking hole; 51. Outer hole; 52. Ejecting inclined plane; 53. First arc-shaped convex part; 54. First arc-shaped concave part; 55. Second arc-shaped convex part; 56. Second arc-shaped concave part; 57. Annular flange; 58. Annular groove; 59. Sleeve; 60. Ejecting rod; 61. Ejecting spring; 62. Slide hole; 63. Slide block; 64. Damping protrusion. Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment: As shown in the attached Figures 1 - 8A high-stability low-voltage wire tightener shown in the figure includes an upper pressure plate 1, a middle pressure plate 2, a lower pressure plate 3 and a housing 4. Two screws 5 are symmetrically arranged at the bottom of the upper pressure plate 1. Two middle holes 6 and two lower holes 7 are respectively provided on the middle pressure plate 2 and the lower pressure plate 3. The screw 5 sequentially passes through the middle hole 6 and the lower hole 7. A locking nut 8 is threadedly connected to the position of the screw 5 below the lower pressure plate 3. The housing 4 is detachably installed at the lower end of the lower pressure plate 3 and covers the bottom of the screw 5 and the locking nut 8 inside. Among them, the lower end of the upper pressure plate 1, the upper end of the middle pressure plate 2, the lower end of the middle pressure plate 2 and the upper end of the lower pressure plate 3 all have arc-shaped concave parts for limit positioning, and anti-slip convex strips are arranged in the arc-shaped concave parts. The wire tightener further includes a pre-tightening mechanism 9 arranged on both sides of the lower pressure plate 3 and cooperating with the two screws 5 respectively. The pre-tightening mechanism 9 includes a pre-tightening knob 10, a follower block 11 and a pre-tightening bushing 12. The pre-tightening bushing 12 is installed on the outer periphery of the screw 5. A plurality of conical teeth 13 with a horizontal upper end and an inclined lower end are uniformly arranged along the vertical direction on the side of the pre-tightening bushing 12. A frustum part 14 is provided on both sides of the lower pressure plate 3. An activity cavity 15 is opened at the outer end of the frustum part 14. A guide hole 16 with a rectangular cross-section and communicating with the lower hole 7 is opened at the inner end of the activity cavity 15. The pre-tightening knob 10 is rotatably connected to the outer end of the frustum part 14. The follower block 11 is arranged in the activity cavity 15, and rotating the pre-tightening knob 10 can drive the follower block 11 to axially slide. A locking convex part 17 that passes through the guide hole 16 and extends into the lower hole 7 and cooperates with the conical teeth 13 is provided on the follower block 11. The upper end of the locking convex part 17 is also an inclined surface. After passing the cable between the upper pressure plate 1 and the middle pressure plate 2 and between the middle pressure plate 2 and the lower pressure plate 3, first push the lower pressure plate 3 upward so that the upper pressure plate 1 and the middle pressure plate 2 clamp the cable, and the middle pressure plate 2 and the lower pressure plate 3 clamp the cable. At the same time, the pre-tightening mechanism 9 is always in effect, that is, after manually pushing the lower pressure plate 3 upward in place, operate the pre-tightening knob 10 to make the follower block 11 move inward, so that the locking convex part 17 on the follower block 11 engages with the conical teeth 13 on the pre-tightening bushing 12, thereby preventing the lower pressure plate 3 from moving downward under its own gravity and the restoring force of the cable itself, resulting in the cable sliding or even falling off due to the decrease in the pressing force. Finally, tighten the locking nut 8. When disassembling, just operate the pre-tightening knob 10 to make the follower block 11 drive the locking convex part 17 to disengage from the conical teeth 13 of the pre-tightening bushing 12, and the locking of the lower pressure plate 3 and the screw 5 can be released. It greatly facilitates the high-altitude operation of the staff and has higher safety at the same time.

[0030] As shown in the appendix Figures 3 - 6As shown, the pre-tightening mechanism 9 further includes four first magnets 18 and four second magnets 19. Four first mounting grooves 20 are circumferentially and arrayedly distributed at the inner end of the pre-tightening knob 10. The four first magnets 18 are respectively embedded in the four first mounting grooves 20, and the magnetic pole setting directions of every two adjacent first magnets 18 are opposite. At the position near the outer end of the inner wall of the first mounting groove 20, there are a plurality of hemispherical first damping protrusions 21 for restricting the first magnet 18 in the first mounting groove 20. Four second mounting grooves 22 are circumferentially and arrayedly distributed at the outer end of the follower block 11. The four second magnets 19 are respectively embedded in the four second mounting grooves 22, and the magnetic pole setting directions of every two adjacent second magnets 19 are opposite. At the position near the outer end of the inner wall of the second mounting groove 22, there are a plurality of hemispherical second damping protrusions 23 for restricting the second magnet 19 in the second mounting groove 22. When the pre-tightening knob 10 is rotated, all the first magnets 18 and the corresponding second magnets 19 are in a state of mutual attraction or mutual repulsion. The initial state is that the first magnet 18 and the second magnet 19 are in a state of mutual repulsion. At this time, the follower block 11 is located at the innermost end of the moving cavity 15 under the action of the repulsive force, and its locking convex portion 17 is engaged with the tapered tooth 13 on the pre-tightening bushing 12. At the same time, when the pre-tightening convex portion moves upward relative to the pre-tightening bushing 12, since the bottom of the tapered tooth 13 is a slope, its upward movement will not be blocked, while the top of the tapered tooth 13 is a horizontal plane, so the downward pressing plate 3 can be prevented from retracting. When disassembly is required, the pre-tightening knob 10 is rotated 90°, so that the first magnet 18 and the second magnet 19 are in a state of mutual attraction. At this time, the follower block 11 slides outward under the action of the magnetic attraction force, and its locking convex portion 17 is separated from the tapered tooth 13 on the pre-tightening bushing 12, thereby releasing the locking of the downward pressing plate 3 and the screw rod 5. Moreover, the installation structure of the first magnet 18 and the second magnet 19 is very convenient and has good firmness.

[0031] As shown in the attached Figure 4 figure, the pre-tightening mechanism 9 further includes a pre-tightening spring 24. A first spring groove 25 is provided at the inner end of the pre-tightening knob 10, and a second spring groove 26 is provided at the outer end of the follower block 11. The two ends of the pre-tightening spring 24 are respectively embedded in the first spring groove 25 and the second spring groove 26. On the basis of the magnetic repulsion force, a spring force is added to the follower block 11 through the pre-tightening spring 24, so that when the locking convex portion 17 abuts against the tapered tooth 13, it is not easy to separate due to shaking, thereby improving the reliability of the locking structure.

[0032] As shown in the attached Figure 5 and attached Figure 7As shown, two hemispherical positioning protrusions 27 are provided on the inner circular surface of the pre-tightening knob 10. Two arc-shaped guide grooves 28 for sliding and positioning of the positioning protrusions 27 are provided on the outer circular surface of the frustum portion 14. The circular angle corresponding to the extending trajectory of the arc-shaped guide groove 28 is 90°. Two suction positioning grooves 29 and separation positioning grooves 30 for the positioning protrusions 27 to be inserted are respectively provided at both ends of the arc-shaped guide groove 28. The depth of the arc-shaped guide groove 28 is less than that of the suction positioning groove 29 and the separation positioning groove 30. The diameters of the suction positioning groove 29 and the separation positioning groove 30 are both equivalent to the diameter of the positioning protrusion 27. This design can achieve the positioning effect after the pre-tightening knob 10 rotates 90°. It is not only convenient to achieve precise angle adjustment, making the first magnet 18 and the second magnet 19 perfectly attract or repel, but also can improve the operation feel.

[0033] As shown in the Figure 4 attachment, a screw hole 31 is radially opened on the side of the pre-tightening bushing 12. A slot 32 corresponding to the screw hole 31 is opened on the side of the screw rod 5. An internal hexagonal screw 33 is threadedly connected to the screw hole 31. The inner end of the internal hexagonal screw 33 is inserted into the slot 32. This design can achieve the fixed installation of the bushing and the screw rod 5. The connection structure is simple and reliable, and the disassembly and assembly are very convenient. In addition, the two can also be fixed together by welding.

[0034] As shown in the Figure 8 attachment, a plurality of card slots 34 are provided on the outer side of the lower pressing plate 3. A plurality of card blocks 35 that fit with the card slots 34 are provided on the inner side of the outer shell 4. This is the first connection method between the outer shell 4 and the lower pressing plate 3, which can achieve the fixed installation of the outer shell 4 and the lower pressing plate 3, and the disassembly and assembly operation is very convenient.

[0035] Embodiment 2: Different from Embodiment 1, the connection method between the lower pressing plate 3 and the outer shell 4 in this embodiment is different.

[0036] As shown in the Figures 9 - 15As shown in the figure, the wire tightener further includes a locking mechanism 36 for locking the outer shell 4. The locking mechanism 36 includes an operating component 37 and an ejecting component 38. The operating component 37 includes a base 39, a guide sleeve 40, a locking rod 41, an operating knob 42, and a compression spring 43. A positioning groove 44 is provided at the front of the outer shell 4. The base 39 is fixedly installed in the positioning groove 44, and a directional recess 45 is provided on the inner side wall of the positioning groove 44. A directional protrusion 46 that fits with the directional recess 45 is provided on the base 39. The two can be connected by glue or by hot melting. The guide sleeve 40 is fixedly installed in the base 39, and the outer diameter of the guide sleeve 40 is equivalent to the inner diameter of the base 39. A limiting flange 47 extending inward is provided at the front end of the guide sleeve 40. The locking rod 41 passes through the guide sleeve 40, and a guide flange 48 that closely fits with the inner circular surface of the guide sleeve 40 is provided on the outer circumference of the locking rod 41. The compression spring 43 is clamped between the guide flange 48 and the limiting flange 47. A movable frame 49 extending into the outer shell 4 is provided at the bottom of the lower pressing plate 3. The movable frame 49 and the lower pressing plate 3 are of an integral structure. A locking hole 50 is provided on the side of the movable frame 49. The inner diameter of the locking hole 50 is equivalent to the outer diameter of the locking rod 41. An outer hole 51 corresponding to the locking hole 50 is provided on the outer shell 4. The locking rod 41 passes through the outer hole 51 and cooperates with the locking hole 50. The outer end of the locking rod 41 is connected to the operating knob 42. The connection method is as follows: a rectangular hole is provided at the inner end of the operating knob 42, and a rectangular protrusion that fits with the rectangular hole is provided at the outer end of the locking rod 41. The operating knob 42 drives the locking rod 41 to insert into or withdraw from the locking hole 50. The ejecting component 38 is arranged in the outer shell 4. And when the locking rod 41 withdraws from the locking hole 50 instantaneously, the ejecting component 38 acts on the movable frame 49 to separate the outer shell 4 from the lower pressing plate 3. An ejecting inclined surface 52 for pushing the locking rod 41 out when the movable frame 49 extends into the outer shell 4 is further provided at the bottom of the movable frame 49. This is the second connection method between the outer shell 4 and the lower pressing plate 3. When the operating knob 42 of the operating component 37 is in the initial position, the compression spring 43 acts on the guide flange 48 on the locking rod 41, causing the locking rod 41 to move inward and insert into the locking hole 50 of the movable frame 49 at the bottom of the lower pressing plate 3, realizing the locking of the outer shell 4 and the lower pressing plate 3. When it is necessary to disassemble the outer shell 4, the operating knob 42 is used to drive the locking rod 41 to move outward, and the locking rod 41 disengages from the locking hole 50 of the movable frame 49 at the bottom of the lower pressing plate 3. At this time, under the action of the ejecting component 38, the outer shell 4 automatically disengages from the lower pressing plate 3. And during the disengagement process of the outer shell 4, the locking rod 41 will abut against the surface of the movable frame 49, thereby realizing the function of damping deceleration and preventing the outer shell 4 from disengaging quickly, resulting in the staff being unable to catch the outer shell 4 in time. This structure can realize the locking of the outer shell 4 and the lower pressing plate 3, and at the same time, it can also eliminate the hidden danger of connection loosening caused by material aging in the first connection method, and the structural reliability is better.

[0037] As shown in the attached Figure 10 、 12As shown in FIGS. 13, a plurality of first arc-shaped convex portions 53 and first arc-shaped concave portions 54 are circumferentially and spacedly arranged at the lower end of the operation knob 42, and a plurality of second arc-shaped convex portions 55 and second arc-shaped concave portions 56 are circumferentially and spacedly arranged at the upper end of the base 39. The first arc-shaped convex portion 53 is fitted with the second arc-shaped concave portion 56, and the first arc-shaped concave portion 54 is fitted with the second arc-shaped convex portion 55. When the operation knob 42 is rotated, when the first arc-shaped convex portion 53 on the operation knob 42 is fitted with the second arc-shaped concave portion 56 on the base 39, and the first arc-shaped concave portion 54 and the second arc-shaped convex portion 55 are fitted, the locking rod 41 is inserted into the lock hole 50. When the first arc-shaped convex portion 53 on the operation knob 42 abuts against the second arc-shaped convex portion 55 on the base 39, the locking rod 41 moves forward and disengages from the lock hole 50. Locking or unlocking is achieved by rotating the operation knob 42, which is very convenient to operate and the structure is more stable and reliable.

[0038] As shown in the attached Figure 10 figure, an annular flange 57 extending outwardly is provided at the rear end of the guide sleeve 40, and an annular groove 58 adapted to the annular flange 57 is provided at the rear end of the base 39. When the base 39 is installed, the effect of pressing and fixing the guide sleeve 40 can be achieved, and the installation operation is very convenient.

[0039] As shown in the attached Figure 15 figure, the ejection assembly 38 includes a sleeve 59, an ejector rod 60 and an ejection spring 61. The sleeve 59 is integrally arranged in the housing 4 in the vertical direction. The ejector rod 60 is movably arranged in the sleeve 59 in the vertical direction. The ejection spring 61 is arranged in the sleeve 59 and applies an upward spring force to the ejector rod 60, so that the upper end of the ejector rod 60 abuts tightly against the lower end of the movable frame 49. At least one slide hole 62 extending in the vertical direction is provided on the side of the sleeve 59, and the slide hole 62 extends to the upper end of the sleeve 59. A slider 63 cooperating with the slide hole 62 is provided on the side of the ejector rod 60. The slider 63 can be designed in a cylindrical shape. A damping convex portion 64 for limiting the upward stroke of the slider 63 is provided at a position near the upper end of the inner wall of the slide hole 62. The damping convex portion 64 is in a hemispherical shape, that is, damping convex portions 64 are provided on both sides of the slide hole 62, and the distance between the two damping convex portions 64 is less than the diameter of the slider 63, so as to limit the slider 63. The telescopic movement of the ejector rod 60 is realized by the change of the force on the ejection spring 61. When the movable frame 49 pushes the ejector rod 60 into the sleeve 59, the ejection spring 61 is compressed and stores energy. At the moment when the ejector rod 60 leaves the lock hole 50 of the movable frame 49, the ejection spring 61 releases energy, pushing the movable frame 49 and the upper pressing plate 1 out, and the housing 4 moves in the direction away from the upper pressing plate 1 under the reaction force, facilitating the disassembly operation of the housing 4.

Claims

1. A low-voltage wire tightener with high stability, comprising an upper pressure plate (1), a middle pressure plate (2), a lower pressure plate (3) and a housing (4). Two screws (5) are symmetrically arranged at the bottom of the upper pressure plate (1). Two middle holes (6) and two lower holes (7) are respectively provided on the middle pressure plate (2) and the lower pressure plate (3). The screws (5) sequentially penetrate through the middle holes (6) and the lower holes (7). A locking nut (8) is threadedly connected to the position of the screw (5) below the lower pressure plate (3). The housing (4) is detachably installed at the lower end of the lower pressure plate (3) and covers the bottom of the screw (5) and the locking nut (8) inside; It is characterized in that: It further includes a pre-tightening mechanism (9) disposed on both sides of the lower pressing plate (3) and cooperating with two screw rods (5) respectively. The pre-tightening mechanism (9) includes a pre-tightening knob (10), a follower block (11) and a pre-tightening bushing (12). The pre-tightening bushing (12) is installed on the outer periphery of the screw rod (5). A plurality of conical teeth (13) with a horizontal upper end and an inclined lower end are uniformly arranged vertically on the side of the pre-tightening bushing (12). A frustum portion (14) is provided on each side of the lower pressing plate (3). An activity cavity (15) is opened at the outer end of the frustum portion (14). A guide hole (16) with a rectangular cross-section and communicating with the lower hole (7) is opened at the inner end of the activity cavity (15). The pre-tightening knob (10) is rotatably connected to the outer end of the frustum portion (14). The follower block (11) is disposed in the activity cavity (15), and rotating the pre-tightening knob (10) can drive the follower block (11) to axially slide. A locking convex portion (17) that penetrates through the guide hole (16) and extends into the lower hole (7) and cooperates with the conical teeth (13) is provided on the follower block (11).

2. The high-stability low-voltage wire tightener according to claim 1, characterized in that: The pre-tightening mechanism (9) further includes four first magnets (18) and four second magnets (19). Four first mounting grooves (20) are circumferentially and arrayedly distributed at the inner end of the pre-tightening knob (10). The four first magnets (18) are respectively embedded in the four first mounting grooves (20), and the magnetic pole setting directions of every two adjacent first magnets (18) are opposite. A plurality of hemispherical first damping protrusions (21) for restricting the first magnet (18) in the first mounting groove (20) are provided at a position near the outer end of the inner wall of the first mounting groove (20). Four second mounting grooves (22) are circumferentially and arrayedly distributed at the outer end of the follower block (11). The four second magnets (19) are respectively embedded in the four second mounting grooves (22), and the magnetic pole setting directions of every two adjacent second magnets (19) are opposite. A plurality of hemispherical second damping protrusions (23) for restricting the second magnet (19) in the second mounting groove (22) are provided at a position near the outer end of the inner wall of the second mounting groove (22). When the pre-tightening knob (10) is rotated, all the first magnets (18) and the corresponding second magnets (19) are in a state of mutual attraction or mutual repulsion.

3. The high-stability low-voltage wire tightener according to claim 2, wherein: The pre-tightening mechanism (9) further includes a pre-tightening spring (24). A first spring groove (25) is provided at the inner end of the pre-tightening knob (10), and a second spring groove (26) is provided at the outer end of the follower block (11). The two ends of the pre-tightening spring (24) are respectively embedded in the first spring groove (25) and the second spring groove (26).

4. The high-stability low-voltage wire tightener according to claim 2, characterized in that: Two hemispherical positioning protrusions (27) are provided on the inner circular surface of the pre-tightening knob (10). Two arc-shaped guide grooves (28) for sliding and positioning the positioning protrusions (27) are provided on the outer circular surface of the frustum portion (14). The circular angle corresponding to the extending trajectory of the arc-shaped guide groove (28) is 90°. Two suction positioning grooves (29) and separation positioning grooves (30) for the positioning protrusions (27) to be inserted are respectively provided at both ends of the arc-shaped guide groove (28). The depth of the arc-shaped guide groove (28) is less than that of the suction positioning groove (29) and the separation positioning groove (30).

5. A highly stable low-voltage wire tightener according to claim 1, characterized in that: A screw hole (31) is radially formed on the side of the pre-tightening bushing (12). A slot (32) corresponding to the screw hole (31) is formed on the side of the screw rod (5). An internal hexagonal stud (33) is threadedly connected to the screw hole (31), and the inner end of the internal hexagonal stud (33) is inserted into the slot (32).

6. The high-stability low-voltage wire tightener according to claim 1, characterized in that: A plurality of card slots (34) are provided on the outer side of the lower pressing plate (3). A plurality of clamping blocks (35) that fit with the card slots (34) are provided on the inner side of the housing (4).

7. The high-stability low-voltage wire tightener according to claim 1, wherein: It further includes a locking mechanism (36) for locking the housing (4). The locking mechanism (36) includes an operating component (37) and an ejecting component (38). The operating component (37) includes a base (39), a guide sleeve (40), a locking rod (41), an operating knob (42), and a compression spring (43). A positioning groove (44) is provided at the front of the housing (4). The base (39) is fixedly installed in the positioning groove (44), and a directional recess (45) is formed on the inner side wall of the positioning groove (44). A directional protrusion (46) that fits with the directional recess (45) is provided on the base (39). The guide sleeve (40) is fixedly installed in the base (39). A limiting flange (47) extending inward is provided at the front end of the guide sleeve (40). The locking rod (41) passes through the guide sleeve (40), and a guide flange (48) that closely fits with the inner circular surface of the guide sleeve (40) is provided on the outer circumference of the locking rod (41). The compression spring (43) is clamped between the guide flange (48) and the limiting flange (47). A movable frame (49) extending into the housing (4) is provided at the bottom of the lower pressing plate (3). A locking hole (50) is provided on the side of the movable frame (49). An outer hole (51) corresponding to the locking hole (50) is provided on the housing (4). The locking rod (41) passes through the outer hole (51) and cooperates with the locking hole (50). The outer end of the locking rod (41) is connected to the operating knob (42). The operating knob (42) drives the locking rod (41) to insert into or withdraw from the locking hole (50). The ejecting component (38) is arranged in the housing (4). And when the locking rod (41) withdraws from the locking hole (50) instantaneously, the ejecting component (38) acts on the movable frame (49) to separate the housing (4) from the lower pressing plate (3). An ejecting inclined surface (52) for pushing the locking rod (41) when the movable frame (49) extends into the housing (4) is further provided at the bottom of the movable frame (49).

8. A highly stable low-voltage wire tightener according to claim 7, characterized in that: A plurality of first arc-shaped protrusions (53) and first arc-shaped recesses (54) are circumferentially and spacedly arranged at the lower end of the operating knob (42). A plurality of second arc-shaped protrusions (55) and second arc-shaped recesses (56) are circumferentially and spacedly arranged at the upper end of the base (39). And the first arc-shaped protrusions (53) fit with the second arc-shaped recesses (56), and the first arc-shaped recesses (54) fit with the second arc-shaped protrusions (55).

9. The high-stability low-voltage wire tightener according to claim 7, wherein: An annular flange (57) extending outward is provided at the rear end of the guide sleeve (40). An annular groove (58) adapted to the annular flange (57) is provided at the rear end of the base (39).

10. A highly stable low-voltage wire tightener according to claim 7, characterized in that: The ejection assembly (38) includes a sleeve (59), an ejector rod (60), and an ejection spring (61). The sleeve (59) is integrally arranged vertically inside the housing (4). The ejector rod (60) is vertically movably arranged inside the sleeve (59). The ejection spring (61) is arranged inside the sleeve (59) and applies an upward spring force to the ejector rod (60), so that the upper end of the ejector rod (60) abuts against the lower end of the movable frame (49). At least one vertically extending sliding hole (62) is provided on the side of the sleeve (59), and the sliding hole (62) extends to the upper end of the sleeve (59). A sliding block (63) matching the sliding hole (62) is provided on the side of the ejector rod (60). A damping convex portion (64) for forming an upper stroke limit for the sliding block (63) is provided at a position near the upper end of the inner wall of the sliding hole (62). The damping convex portion (64) is in a hemispherical shape.

Images