A cable accessory and testing device therefor

Abstract

This invention belongs to the technical field of conductive components, specifically a cable accessory and its testing device, including an intermediate joint; the intermediate joint includes a left cylinder and a right cylinder; a sliding cylinder is provided inside the left cylinder; a uniformly arranged slider is fixed on the outer ring of the sliding cylinder; a uniformly arranged slide rail is opened on the inner ring of the left cylinder; a uniformly arranged first notch is opened on the inner ring of the sliding cylinder; a first U-shaped conductor is fixed in each of the first notches, and the opening of the first U-shaped conductor faces the outer ring of the sliding cylinder; a first circular plate is fixed inside the right cylinder; a cylinder is fixed on the left side of the first circular plate; a uniformly arranged second notch is opened on the outer ring of the cylinder; a second U-shaped conductor is fixed in each of the second notches, and a portion of the second U-shaped conductor protrudes from the second notch; a uniformly arranged first inlet slot is opened on the right end face of the first circular plate; this invention simplifies the construction steps and shortens the wiring operation time by setting an intermediate joint.

Description

Technical Field

[0001] This invention belongs to the field of conductive component technology, specifically a cable accessory and its testing device. Background Technology

[0002] Cable joints are core accessories in power transmission systems used to connect two cable segments to form a continuous circuit. They are widely used in urban power grids, industrial power distribution, and rail transportation. As the weakest link in a cable line, their electrical performance, mechanical strength, and sealing reliability directly determine the safe and stable operation of the entire power system. Depending on the cable voltage level and application scenario, cable joints can be classified into various types, including cold-shrink, heat-shrink, prefabricated, and fusion-welded joints. Among these, cold-shrink and prefabricated joints are the mainstream products in the current market due to their convenient installation and stable performance.

[0003] In actual construction, the installation of cable joints must follow strict process specifications. For single-core cables, the construction process is relatively simple, mainly including cable stripping, conductor crimping, insulation restoration, shielding repair, and sealing. However, multi-core cables are widely used in power systems, including 2-core single-phase cables, 3-core medium-voltage cables, and 4-core and 5-core low-voltage distribution cables. For connecting multi-core cables, the traditional process requires construction personnel to process each core independently: first, strip the insulation layer of each core, crimp it using a conductor connector, then restore the insulation and shielding layer of each core separately, and finally stack the multiple cores together after all cores are connected, and finally wrap the entire structure with an insulation layer and a sealing sheath.

[0004] This traditional process of connecting each core one by one and then covering the whole has many significant drawbacks. First, the construction efficiency is low, the operation is cumbersome and time-consuming. As the number of cable cores increases, the construction steps increase linearly. The installation time of a 5-core cable joint is usually 3-4 times that of a single-core joint, and the installation of joints for control cables can take several hours or even longer.

[0005] Once a wiring error occurs, repair is difficult and costly. Because the conductor connecting tube uses hydraulic crimping to achieve a permanent connection, it cannot be removed without damage once crimping is completed. If a phase error is found, a special tool must be used to cut the connecting tube, re-strip the cable core, and replace it with a new connecting tube for secondary crimping. This process not only wastes materials and time, but also shortens the effective length of the cable. It may even damage the cable structure due to repeated stripping, leaving long-term safety hazards. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a cable accessory and its testing device. By setting an intermediate joint, the construction steps can be simplified and the wiring operation time can be shortened. The specific structure is as follows.

[0007] On one hand, the present invention provides a cable accessory including an intermediate joint; the intermediate joint includes a left tube and a right tube;

[0008] The left cylinder is equipped with a sliding cylinder; the outer ring of the sliding cylinder is fixed with evenly arranged sliders; the inner ring of the left cylinder is provided with evenly arranged slide tracks, and the sliders slide within the slide tracks; the sliding cylinder is made of insulating plastic material.

[0009] The inner ring of the slide cylinder is provided with evenly arranged first notches; each of the first notches is fixed with a first U-shaped conductor, and the opening of the first U-shaped conductor faces the outer ring of the slide cylinder.

[0010] The slide cylinder is provided with a first locking assembly;

[0011] A first circular plate is fixed inside the right cylinder, and the left end face of the first circular plate is flush with the left end face of the right cylinder; a cylinder is fixed to the left side of the first circular plate; the outer diameter of the cylinder is the same as the inner diameter of the slide cylinder; the cylinder and the circular plate are made of insulating plastic material.

[0012] The outer ring of the cylinder has evenly arranged second notches; each second notch is fixed with a second U-shaped conductor, and the second U-shaped conductor is partially exposed from the second notch; the opening of the second U-shaped conductor faces the inner ring of the cylinder;

[0013] The right end face of the first circular plate is provided with uniformly arranged first inlet slots, and the first inlet slots correspond one-to-one with the second U-shaped conductors;

[0014] The cylinder is provided with a second locking assembly;

[0015] Both the left and right cylinders are equipped with fixing components on opposite sides;

[0016] Both the left and right cylinders have threads on their outer rings; the right cylinder's outer ring threads engage with a first threaded cylinder.

[0017] In a preferred embodiment of the present invention, the first locking assembly includes a rotating ring; an annular groove is formed on the right side of the slider on the outer ring of the slide cylinder; and a rotating ring rotates within the annular groove.

[0018] A first pressure plate slides within a plurality of first U-shaped conductors; a first push plate is fixed to the side of the first pressure plate facing the opening of the first U-shaped conductor; the first push plate extends into an annular groove;

[0019] The rotating ring has a first spiral groove on the side of its surface facing the first push plate; the first push plate has an arc-shaped tooth fixed on the side of its surface facing the rotating ring, and the arc-shaped tooth slides in the first spiral groove.

[0020] The rotating ring and the first push plate are made of insulating plastic material;

[0021] A second pressure plate slides inside the second U-shaped conductor; a second push plate is fixed to the side of the second pressure plate facing the inner ring of the cylinder, and the second push plate extends to the inner ring of the cylinder;

[0022] The second locking assembly includes a turntable; the inner ring of the cylinder has a rotating turntable; the turntable has a second spiral groove on the side facing the second push plate; the second push plate extends to one side surface of the turntable; the side of the second push plate facing the turntable also has arc-shaped teeth, and the arc-shaped teeth slide in the second spiral groove.

[0023] The turntable and the second push plate are made of insulating plastic material;

[0024] The outer ring of the rotating ring has toothed grooves; the left end of the rotating disk has a hexagonal groove.

[0025] In a preferred embodiment of the present invention, the bottom surfaces inside both the first U-shaped conductor and the second U-shaped conductor are arc surfaces;

[0026] The side of the first pressure plate facing the inner bottom surface of the first U-shaped conductor is also an arc surface; the side of the second pressure plate facing the inner bottom surface of the second U-shaped conductor is also an arc surface.

[0027] In a preferred embodiment of the present invention, a fan-shaped groove is formed on the surface of the first U-shaped conductor opposite to its own opening.

[0028] The second U-shaped conductor has a fan-shaped conductor fixed on the side surface opposite to its opening, and the fan-shaped conductor corresponds one-to-one with the fan-shaped slot.

[0029] In a preferred embodiment of the present invention, the fixing component includes a connecting cylinder; a mounting ring block is fixed to the left side of the connecting cylinder, and the outer ring of the mounting ring block is threaded.

[0030] The inner rings of the left and right cylinders are also provided with threads that engage with the outer ring threads of the mounting ring block;

[0031] A second circular plate is fixed on the left side of the slide cylinder, and the second circular plate slides inside the left cylinder; a second inlet groove is evenly arranged on the left end face of the second circular plate, and the second inlet groove corresponds one-to-one with the first U-shaped conductor.

[0032] In a preferred embodiment of the present invention, the two mounting ring blocks are provided with annular cavities on one side surface facing the first circular plate and the second circular plate, respectively.

[0033] An annular shaft rotates within the annular cavity; an annular plate is fixed on the annular shaft; and a silicone rubber ring is fixed on the annular plate, and the silicone rubber ring is soft in texture.

[0034] In a preferred embodiment of the present invention, the outer ring of the connecting cylinder is provided with two arc-shaped groove groups; each of the two arc-shaped groove groups includes a plurality of evenly arranged arc-shaped grooves, and is respectively provided on the outer ring of the connecting cylinder;

[0035] The arc grooves in the two arc groove groups are staggered; a pressing block slides in each arc groove; the side of the pressing block away from the mounting ring plate is inclined; a rubber block is fixed to the side of the pressing block facing the inner ring of the connecting cylinder; the sides of the rubber blocks in the staggered arc grooves are in contact with each other;

[0036] The outer ring of the connecting cylinder is threaded; the outer ring of the connecting cylinder is threaded to a second threaded cylinder.

[0037] In a preferred embodiment of the present invention, a retaining shaft is provided on the left side of the second threaded cylinder;

[0038] The connecting cylinder has a cylindrical groove, and the retaining shaft slides in the cylindrical groove and is connected to a spring.

[0039] In a preferred embodiment of the present invention, the first U-shaped conductor and the first pressure plate portion extend to the right side of the slide cylinder;

[0040] The second U-shaped conductor and the second pressure plate extend to the left side of the cylinder;

[0041] The first circular plate has evenly arranged first long slots, and each of the first long slots corresponds to a first U-shaped conductor.

[0042] The second circular plate has evenly arranged second long slots, and each of the second long slots corresponds to a second U-shaped conductor.

[0043] Spring pressure plates are fixed in both the first and second long slots, and the ends of the spring pressure plates are bent outwards; the width of the spring pressure plates is smaller than the width of the first and second pressure plates.

[0044] On the other hand, in order to test the aforementioned cable accessories, the present invention also provides a testing device for cable accessories, including a base; a drive groove is provided on the base; and two drive blocks slide within the drive groove.

[0045] A bidirectional lead screw rotates within the drive slot, and the drive block and the bidirectional lead screw are driven by a helical transmission; the bidirectional lead screw is driven by a motor; a fixing block is fixed to the top of the two drive blocks, and a semi-circular groove is opened on the top of the fixing block;

[0046] The top of the fixing block is provided with a clamping block; the bottom of the clamping block is also provided with a semi-circular groove; two locking bolts are inserted into the clamping block; and two threaded grooves are provided on the top of the fixing block.

[0047] The beneficial effects of this invention are as follows:

[0048] 1. The cable accessory and its testing device described in this invention, by inserting the wire cores into the corresponding first and second U-shaped conductors, and by rotating the ring and turntable, all wire cores can be clamped and fixed. The overall connection is then completed by connecting the left and right cylinders and tightening the first threaded cylinder. This significantly simplifies the construction steps, shortens the wiring operation time, and reduces reliance on the technical skills of construction personnel, thus reducing the possibility of human error. Furthermore, in the event of a wiring error, rotating the first threaded cylinder in the reverse direction separates the left and right cylinders. Then, rotating the ring and turntable in the reverse direction releases the pressure of the first and second pressure plates on the wire cores, allowing for free adjustment of the wire core position and re-wiring. The entire repair process does not require damage to the cable structure or replacement of any core components, saving material costs and construction time, avoiding permanent damage to the cable caused by secondary stripping, and eliminating potential safety hazards.

[0049] 2. The cable accessory and its testing device described in this invention, since multiple first U-shaped conductors and second U-shaped conductors are provided, can perform wiring operations on various cables with core numbers not exceeding the number of conductors, without the need to prepare intermediate joints of different specifications for cables with different core numbers; it can adapt to the complex and varied cable specifications at the construction site, and can carry out construction without waiting for the arrival of joints of specific specifications, greatly improving the flexibility of construction and emergency response capability; and minimizing the power outage time due to power failure.

[0050] 3. The cable accessory and its testing device described in this invention are made of insulating plastic material for both the slide and the cylinder, and each first U-shaped conductor and second U-shaped conductor are independently set in the corresponding first and second slots. Different wire cores and their connecting conductors are completely separated by insulating material, forming a clear and reliable phase-to-phase insulation boundary. This avoids the problem of insufficient phase-to-phase insulation distance and easy phase-to-phase short circuit caused by the tight stacking of multiple wire cores in traditional processes. At the same time, the natural gap between each wire core also provides a good channel for heat dissipation, effectively reducing the operating temperature rise of the joint and extending the service life of the joint. Attached Figure Description

[0051] The invention will now be further described with reference to the accompanying drawings.

[0052] Figure 1 This is a schematic diagram of the cable after being connected through an intermediate connector in this invention;

[0053] Figure 2 This is a schematic diagram of the cable connection using an intermediate joint in this invention;

[0054] Figure 3 This is the present invention. Figure 2 Enlarged view of a portion of point A in the middle;

[0055] Figure 4 This is a schematic diagram of the cable after wiring being tested by the testing device in this invention;

[0056] Figure 5 This is a diagram showing the separation structure of the inner sliding cylinder of the left cylinder in this invention;

[0057] Figure 6 This is a structural diagram of the separation of the inner cylinder of the right cylinder in this invention;

[0058] Figure 7 This is a diagram showing the state of the cylinder inserted into the sliding cylinder in this invention;

[0059] Figure 8 This is a diagram showing the state of the sector-shaped conductor of the second U-shaped conductor inserted into the sector-shaped groove of the first U-shaped conductor in this invention;

[0060] Figure 9 This is a schematic diagram of the fixing component, the cylinder, and the first circular plate in this invention;

[0061] Figure 10 This is a cross-sectional view of the cable after it has been connected via an intermediate connector in this invention;

[0062] Figure 11 This is the present invention. Figure 10 Enlarged view of a section at point B in the middle;

[0063] Figure 12 This is the present invention. Figure 10 Enlarged view of a section at point C;

[0064] Figure 13 This is the present invention. Figure 10 Enlarged view of a section at point D.

[0065] In the diagram: 1. Left cylinder; 11. Sliding cylinder; 12. Sliding block; 13. Slide rail; 14. First notch; 15. First U-shaped conductor; 2. Right cylinder; 21. First circular plate; 22. Circular cylinder; 23. Second notch; 24. Second U-shaped conductor; 25. First inlet slot; 26. First threaded cylinder; 27. Sector groove; 28. Sector conductor; 3. Rotary ring; 31. Annular groove; 32. First pressure plate; 33. First push plate; 34. First spiral groove; 35. Arc tooth; 4. Turntable; 41 42. Second push plate; 43. Second spiral groove; 5. Connecting cylinder; 51. Mounting ring block; 52. Second circular plate; 53. Second inlet groove; 54. Annular shaft; 55. Ring plate; 56. Silicone rubber ring; 6. Arc groove; 61. Extrusion block; 62. Rubber block; 63. Second threaded cylinder; 64. Shaft clamp; 7. First long groove; 71. Second long groove; 72. Spring pressure plate; 8. Base; 81. Drive block; 82. Bidirectional lead screw; 83. Fixing block; 84. Clamping block. Detailed Implementation

[0066] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0067] like Figures 1 to 13 As shown, the cable accessory of the present invention includes an intermediate joint; the intermediate joint includes a left cylinder 1 and a right cylinder 2; a sliding cylinder 11 is provided inside the left cylinder 1; a uniformly arranged slider 12 is fixed on the outer ring of the sliding cylinder 11; a uniformly arranged slide rail 13 is opened on the inner ring of the left cylinder 1, and the slider 12 slides in the slide rail 13; the sliding cylinder 11 is made of insulating plastic material; a uniformly arranged first notch 14 is opened on the inner ring of the sliding cylinder 11; a first U-shaped conductor 15 is fixed in each first notch 14, and the opening of the first U-shaped conductor 15 faces the outer ring of the sliding cylinder 11; a first locking assembly is provided on the sliding cylinder 11; a first circular plate 21 is fixed inside the right cylinder 2, and the left end face of the first circular plate 21 is flush with the left end face of the right cylinder 2; a circular... Cylinder 22; the outer diameter of the cylinder 22 is the same as the inner diameter of the slide cylinder 11; the cylinder 22 and the circular plate are made of insulating plastic material; the outer circumference of the cylinder 22 is provided with uniformly arranged second notches 23; each second notch 23 is fixed with a second U-shaped conductor 24, and part of the second U-shaped conductor 24 is exposed from the second notch 23; the opening of the second U-shaped conductor 24 faces the inner circumference of the cylinder 22; the right end face of the first circular plate 21 is provided with uniformly arranged first inlet grooves 25, and the first inlet grooves 25 correspond one-to-one with the second U-shaped conductors 24; the cylinder 22 is provided with a second locking assembly; the left cylinder 1 and the right cylinder 2 are both provided with fixing assemblies on opposite sides; the outer circumferences of the left cylinder 1 and the right cylinder 2 are both provided with threads; the outer circumference of the right cylinder 2 is threaded with a first threaded cylinder 26.

[0068] In this embodiment, the first locking assembly includes a rotating ring 3; an annular groove 31 is formed on the right side of the slider 12 on the outer ring of the slide cylinder 11; the rotating ring 3 rotates within the annular groove 31; a first pressure plate 32 slides within a plurality of first U-shaped conductors 15; a first push plate 33 is fixed to the side of the first pressure plate 32 facing the opening of the first U-shaped conductor 15; the first push plate 33 extends into the annular groove 31; a first spiral groove 34 is formed on the surface of the rotating ring 3 facing the first push plate 33; an arc-shaped tooth 35 is fixed to the side of the first push plate 33 facing the rotating ring 3, and the arc-shaped tooth 35 slides within the first spiral groove 34; the rotating ring 3 and the first push plate 33 are made of insulating plastic material; the second A second pressure plate 41 slides inside the U-shaped conductor 24; a second push plate 42 is fixed to the side of the second pressure plate 41 facing the inner ring of the cylinder 22, and the second push plate 42 extends to the inner ring of the cylinder 22; the second locking assembly includes a turntable 4; the turntable 4 rotates within the inner ring of the cylinder 22; a second spiral groove 43 is formed on the side of the turntable 4 facing the second push plate 42; the second push plate 42 extends to one side surface of the turntable 4; the side of the second push plate 42 facing the turntable 4 also has arc-shaped teeth 35, and the arc-shaped teeth 35 slide within the second spiral groove 43; the turntable 4 and the second push plate 42 are made of insulating plastic material; the outer ring of the rotating ring 3 has a toothed groove; the left end of the turntable 4 has a hexagonal groove.

[0069] When connecting two cables, first pass the two cables to be connected through the two fixed components respectively. Then, strip the outer sheath, inner sheath and core insulation layer of the cable ends to expose the conductor part of the core. At this time, according to the number of cores inside the cable, select the corresponding number of first U-shaped conductors 15 and second U-shaped conductors 24. Since there are multiple first U-shaped conductors 15 and second U-shaped conductors 24, connection operations can be performed on cables with different numbers of cores.

[0070] After the insulation layer of each wire core is removed and the conductor portion is exposed, the two cables are inserted into the left tube 1 and the right tube 2 respectively. At the same time, the slide cylinder 11 in the left tube 1 is pulled out from the left tube 1. The slide cylinder 11 will drive the slider 12 fixed on its outer ring to move along the slide track 13 opened in the inner ring of the left tube 1. When the slide cylinder 11 is pulled out to the appropriate position, the wire core conductor portions of the two cables that have been stripped are inserted into the corresponding first U-shaped conductor 15 and second U-shaped conductor 24 respectively. It is necessary to ensure that the positions of the first U-shaped conductor 15 and second U-shaped conductor 24 into which the wire cores that need to be connected correspond to each other. At the same time, it is necessary to ensure that only the wire core conductors enter the first U-shaped conductor 15 and second U-shaped conductor 24. During the process of inserting the wire core in the right tube 2 into the second U-shaped conductor 24, the wire core needs to pass through the first inlet slot 25 corresponding to the second U-shaped conductor 24 one by one, and then be inserted into the internal space of the second U-shaped conductor 24.

[0071] Specifically, after all the wire cores in the left cylinder 1 are inserted into the corresponding first U-shaped conductor 15, the rotating ring 3 is rotated by hand or pipe wrench. The rotating ring 3 will rotate within the annular groove 31 on the outer ring of the sliding cylinder 11. Since a first pressure plate 32 is slidably arranged inside the first U-shaped conductor 15, a first push plate 33 is fixed on the side of the first pressure plate 32 facing the opening of the first U-shaped conductor 15, and the first push plate 33 extends into the annular groove 31. A first spiral groove 34 is opened on the surface of the rotating ring 3 facing the first push plate 33, and the first push plate 33 is fixed on the side facing the rotating ring 3. There is an arc-shaped tooth 35, which slides in the first spiral groove 34. During the rotation of the ring 3, since the first push plate 33 is limited by the first pressure plate 32 and cannot rotate with the ring 3, the rotating first spiral groove 34 will push the arc-shaped tooth 35 to move towards the first U-shaped conductor 15, thereby driving the first push plate 33 and the first pressure plate 32 to gradually slide into the interior of the first U-shaped conductor 15, and gradually press and fix the wire core conductor that enters the first U-shaped conductor 15. When the wire core conductor is firmly pressed by the first pressure plate 32, the rotation of the ring 3 stops.

[0072] More specifically, after all the wire cores in the right cylinder 2 are inserted into the corresponding second U-shaped conductor 24, the Allen wrench is inserted into the hexagonal groove at the left end of the turntable 4, and the turntable 4 is rotated; since a second pressure plate 41 is slidably arranged inside the second U-shaped conductor 24, a second push plate 42 is fixed on the side of the second pressure plate 41 facing the inner circle of the cylinder 22, and the second push plate 42 extends to the inner circle of the cylinder 22, a second spiral groove 43 is opened on the side of the turntable 4 facing the second push plate 42, and the second push plate 42 faces the turntable One side of 4 is also provided with arc-shaped teeth 35, which slide in the second spiral groove 43. Therefore, during the rotation of turntable 4, the second spiral groove 43 will push the corresponding arc-shaped teeth 35 to move towards the second U-shaped conductor 24, and at the same time drive the second push plate 42 and the second pressure plate 41 to gradually slide into the interior of the second U-shaped conductor 24, and gradually lock and fix the wire core conductor in the second U-shaped conductor 24. When the wire core conductor is firmly pressed by the second pressure plate 41, the rotation of turntable 4 stops.

[0073] Furthermore, the slide cylinder 11 is then pushed into the left cylinder 1, and the cylinder 22 fixed inside the right cylinder 2 is gradually inserted into the inner ring of the slide cylinder 11, so that the part of the second U-shaped conductor 24 exposed in the second notch 23 is gradually inserted into the first notch 14, while the second U-shaped conductor 24 and the first U-shaped conductor 15 are tightly fitted together. Since the first U-shaped conductor 15 and the second U-shaped conductor 24 inserted into the wire cores that need to be connected correspond to each other, the electrical connection between the corresponding wire cores can be achieved when the first U-shaped conductor 15 and the second U-shaped conductor 24 are tightly fitted together. After the end faces of the left cylinder 1 and the right cylinder 2 are completely fitted together, the first threaded cylinder 26 is rotated, and the first threaded cylinder 26 will gradually rotate into the threaded surface of the outer ring of the left cylinder 1 and mesh with the thread of the outer ring of the left cylinder 1, thereby achieving a firm fixation between the left cylinder 1 and the right cylinder 2. Finally, the two cables are clamped and fixed using the fixing components, thus completing the entire cable wiring operation.

[0074] Furthermore, by inserting the wire cores into the corresponding first U-shaped conductor 15 and second U-shaped conductor 24, all wire cores can be clamped and fixed by rotating the rotating ring 3 and the turntable 4. Then, the overall connection is completed by connecting the left cylinder 1 and the right cylinder 2 and tightening the first threaded cylinder 26. This greatly simplifies the construction steps, shortens the wiring operation time, and reduces the dependence on the technical level of the construction personnel, thus reducing the possibility of human error. At the same time, when a wiring error occurs, rotating the first threaded cylinder 26 in the reverse direction separates the left cylinder 1 and the right cylinder 2. Then, rotating the rotating ring 3 and the turntable 4 in the reverse direction respectively releases the pressure of the first pressure plate 32 and the second pressure plate 41 on the wire core, allowing the position of the wire core to be freely adjusted and the correct wiring operation to be performed again. The entire repair process does not require damage to the cable body structure or replacement of any core components, which saves material costs and construction time, avoids permanent damage to the cable caused by secondary stripping, and eliminates potential safety hazards.

[0075] Meanwhile, since there are multiple first U-shaped conductors 15 and second U-shaped conductors 24, wiring operations can be performed on various cables with core numbers not exceeding the number of conductors, without the need to prepare intermediate joints of different specifications for cables with different core numbers; it can adapt to the complex and varied cable specifications at the construction site, and construction can be carried out without waiting for the arrival of joints of specific specifications, which greatly improves the flexibility of construction and emergency response capabilities; and minimizes the power outage time due to power failure.

[0076] Meanwhile, since both the slide 11 and the cylinder 22 are made of insulating plastic material, and each of the first U-shaped conductor 15 and the second U-shaped conductor 24 is independently set in the corresponding first slot 14 and the second slot 23, the different wire cores and their connecting conductors are completely separated by insulating material, forming a clear and reliable phase-to-phase insulation boundary; thus avoiding the problem of insufficient phase-to-phase insulation distance and easy phase-to-phase short circuit caused by the tight stacking of multiple wire cores in the traditional process. At the same time, the natural gap between each wire core also provides a good channel for heat dissipation, effectively reducing the operating temperature rise of the joint and extending the service life of the joint.

[0077] As an embodiment of the present invention, the bottom surfaces inside the first U-shaped conductor 15 and the second U-shaped conductor 24 are both arc surfaces; the side of the first pressure plate 32 facing the bottom surface inside the first U-shaped conductor 15 is also an arc surface; the side of the second pressure plate 41 facing the bottom surface inside the second U-shaped conductor 24 is also an arc surface.

[0078] In this embodiment, a fan-shaped groove 27 is formed on the side surface of the first U-shaped conductor 15 opposite to its own opening; a fan-shaped conductor 28 is fixed on the side surface of the second U-shaped conductor 24 opposite to its own opening, and the fan-shaped conductor 28 corresponds one-to-one with the fan-shaped groove 27.

[0079] Since the bottom surfaces of the first U-shaped conductor 15 and the second U-shaped conductor 24 are both designed as arc surfaces, the side of the first pressure plate 32 facing the bottom surface of the first U-shaped conductor 15 is also an arc surface, and the side of the second pressure plate 41 facing the bottom surface of the second U-shaped conductor 24 is also an arc surface; during the process of the first pressure plate 32 and the second pressure plate 41 gradually squeezing the wire core, for the cable core made of multiple thin copper wires twisted together, the arc surface structure can guide the multiple copper wires in the wire core to spread evenly to both sides, so that the copper wires can fully fill the arc surface space inside the first U-shaped conductor 15 and the second U-shaped conductor 24, thereby achieving full fit between the wire core and the first U-shaped conductor 15, the second U-shaped conductor 24, and the first pressure plate 32 and the second pressure plate 41.

[0080] Specifically, since the first U-shaped conductor 15 has a fan-shaped groove 27 on the side of its opening opposite to its own opening, and the second U-shaped conductor 24 has a fan-shaped conductor 28 fixed on the side of its opening opposite to its own opening, and the fan-shaped conductor 28 corresponds one-to-one with the fan-shaped groove 27; during the process of the second U-shaped conductor 24 partially inserting into the first notch 14 and fitting together with the first U-shaped conductor 15, the second U-shaped conductor 24 will drive the fan-shaped conductor 28 fixed on its surface to be inserted into the fan-shaped groove 27 opened on the surface of the first U-shaped conductor 15 simultaneously.

[0081] Since both the sector conductor 28 and the sector groove 27 have sector-shaped cross-sections, when the sector conductor 28 is fully inserted into the sector groove 27, their sidewalls will fit tightly together, forming a mutually limiting structural relationship. When the sector conductor 28 is inserted into the sector groove 27, their sector sidewalls will engage with each other. At the same time, they also have a certain self-locking characteristic. When the two conductors tend to separate vertically, they will hinder each other, thereby ensuring that the first U-shaped conductor 15 and the second U-shaped conductor 24 can maintain a tight fit for a long time. This effectively avoids the occurrence of poor contact and connection failure, and significantly improves the reliability and stability of the joint during long-term operation.

[0082] As an embodiment of the present invention; the fixing component includes a connecting cylinder 5; a mounting ring block 51 is fixed on the left side of the connecting cylinder 5, and the outer ring of the mounting ring block 51 is threaded; the inner rings of the left cylinder 1 and the right cylinder 2 are also threaded to engage with the outer ring thread of the mounting ring block 51; a second circular plate 52 is fixed on the left side of the sliding cylinder 11, and the second circular plate 52 slides inside the left cylinder 1; the left end face of the second circular plate 52 is provided with uniformly arranged second inlet grooves 53, and the second inlet grooves 53 correspond one-to-one with the first U-shaped conductor 15.

[0083] In this embodiment, the two mounting ring blocks 51 have annular cavities on one side of the first circular plate 21 and the second circular plate 52, respectively; an annular shaft 54 ​​rotates inside the annular cavity; an annular plate 55 is fixed on the annular shaft 54; and a silicone rubber ring 56 is fixed on the annular plate 55, and the silicone rubber ring 56 is soft.

[0084] Since a second circular plate 52 is fixed to the left side of the slide cylinder 11 and slides inside the left cylinder 1, the left end face of the second circular plate 52 has evenly arranged second inlet slots 53, and each second inlet slot 53 corresponds to a first U-shaped conductor 15. During the process of inserting the wire core into the first U-shaped conductor 15, the stripped wire core must first pass through the second inlet slot 53 on the second circular plate 52, and then be inserted into the corresponding first U-shaped conductor 15 for locking and fixing. The position of the second inlet slot 53 is precisely aligned with the position of the first U-shaped conductor 15, which guides and positions the wire core, ensuring that each wire core can be accurately inserted into the corresponding first U-shaped conductor 15.

[0085] Specifically, after the left cylinder 1 and the right cylinder 2 are fixed by the first threaded cylinder 26, since the fixing component is pre-fitted onto the cable, the mounting rings 51 fixed on the connecting cylinders 5 fitted onto the two cables are aligned with the opposite end faces of the left cylinder 1 and the right cylinder 2, and the connecting cylinders 5 and the mounting rings 51 are gradually rotated; the mounting rings 51 will gradually rotate into the interior of the left cylinder 1 and the right cylinder 2, and the threads of the outer ring of the mounting rings 51 will mesh with the threads of the inner ring of the left cylinder 1 and the right cylinder 2, thereby driving the entire fixing component to move axially into the joint.

[0086] More specifically, as the installation ring 51 gradually enters the left cylinder 1 and right cylinder 2, it will drive the annular shaft 54, the annular plate 55, and the silicone rubber ring 56 fixed on the annular plate 55 to move synchronously towards the first circular plate 21 and the second circular plate 52. Since the annular plate 55 is rotatably connected to the annular cavity through the annular shaft 54, and since the wire core located in the first U-shaped conductor 15 and the second U-shaped conductor 24 is only a conductor, and the wire core insulation layer extends into the first inlet groove 25 and the second inlet groove 53, when the silicone rubber ring 56 contacts the surface of the wire core with the insulation layer... When contact is made, friction is generated between the insulation layer of the wire core and the silicone rubber ring 56. At this time, the mounting ring block 51 is rotated to move it inward. The annular shaft 54 ​​will slide along the inner wall of the annular cavity, while the ring plate 55 and the silicone rubber ring 56 will not rotate with the mounting ring block 51, but will only maintain axial movement. As the mounting ring block 51 continues to be screwed in, the silicone rubber ring 56 will gradually fit tightly against the end faces of the first circular plate 21 and the second circular plate 52, thereby firmly clamping the wire core with insulation layer between the silicone rubber ring 56 and the first circular plate 21 or the second circular plate 52.

[0087] Furthermore, the soft silicone rubber ring 56 can adapt to wire cores of different diameters, evenly wrapping the surface of each wire core. It can not only form a firm clamp on the wire core, but also, when the cable is pulled by external force, the tension will first be transmitted through the silicone rubber ring 56 to the first circular plate 21 and the second circular plate 52, and then from the first circular plate 21 and the second circular plate 52 to the entire intermediate joint. This reduces the stress on the conductor connection part and effectively prevents the problem of wire core detachment, poor contact or even connection breakage caused by external force pulling, significantly improving the operational reliability of the joint under complex working conditions.

[0088] As an embodiment of the present invention; the outer ring of the connecting cylinder 5 has two arc-shaped groove groups; each of the two arc-shaped groove groups includes a plurality of evenly arranged arc-shaped grooves 6, and is respectively opened on the outer ring of the connecting cylinder 5; the arc-shaped grooves 6 in the two arc-shaped groove groups are staggered; a pressing block 61 slides in each arc-shaped groove 6; the side of the pressing block 61 away from the mounting ring plate 55 is inclined; a rubber block 62 is fixed on the side of the pressing block 61 facing the inner ring of the connecting cylinder 5; the sides of the rubber blocks 62 in the staggered arc-shaped grooves 6 are in contact with each other; the outer ring of the connecting cylinder 5 is threaded; a second threaded cylinder 63 is threadedly engaged on the outer ring of the connecting cylinder 5.

[0089] In this embodiment, a retaining shaft 64 is provided on the left side of the second threaded cylinder 63; a cylindrical groove is provided inside the connecting cylinder 5, and the retaining shaft 64 slides in the cylindrical groove and is connected to a spring.

[0090] When inserting the two cables from the fixing assembly, first pass the two cables through the corresponding second threaded cylinders 63, and then pass the cables through the connecting cylinder 5. After the mounting ring block 51 is rotated into the left cylinder 1 and the right cylinder 2 respectively and the internal wire core is clamped and fixed, align the end of the second threaded cylinder 63 with the end of the connecting cylinder 5, and manually press all the retaining pins 64 into the corresponding cylindrical grooves to put the spring in a compressed and energy-storing state. Then rotate the second threaded cylinder 63, and the second threaded cylinder 63 will gradually move towards the mounting ring block 51 along the thread of the outer ring of the connecting cylinder 5.

[0091] When the inner ring of the second threaded cylinder 63 passes the inclined surface of the extrusion block 61, it will generate radial extrusion force on the inclined surface, pushing the extrusion block 61 to gradually slide into the arc groove 6; as the second threaded cylinder 63 continues to move, its inner ring continues to extrude the inclined surface of the extrusion block 61, causing the extrusion block 61 to drive the rubber block 62 to gradually move towards the inner ring of the connecting cylinder 5, until the rubber block 62 is in close contact with the outer sheath surface of the cable.

[0092] Specifically, when the end face of the second threaded cylinder 63 is fully engaged with the end face of the mounting ring block 51, all the extrusion blocks 61 in the two sets of arc grooves are fully pressed into the arc grooves 6. The rubber blocks 62 undergo elastic deformation under the extrusion force, tightly wrapping around the outer sheath surface of the cable. At the same time, since the arc grooves 6 in the two sets of arc grooves are staggered, the sides of adjacent rubber blocks 62 will be squeezed against each other and tightly combined to form a continuous and seamless annular clamping and sealing structure. When the end face of the second threaded cylinder 63 is engaged with the end face of the mounting ring block 51, the retaining shaft 64 is no longer blocked by the second threaded cylinder 63. The spring release force pushes the retaining shaft 64 to slide out from the cylindrical groove and into the retaining hole of the second threaded cylinder 63, forming a circumferential limit on the second threaded cylinder 63 and preventing it from rotating in the opposite direction and loosening during operation.

[0093] Furthermore, by using rubber blocks 62 to fix the cable, the cable can effectively resist various complex external forces, including axial tension, radial pressure, torsional force, and vibration impact, fundamentally preventing the cable from shifting, twisting, or falling off inside the joint, ensuring the long-term stability of the conductor connection. At the same time, by arranging the rubber blocks 62 in the arc-shaped groove in an alternating manner, when the rubber blocks 62 are squeezed and deformed, the sides of adjacent rubber blocks 62 will squeeze each other and tightly combine to form a continuous and complete annular sealing surface, completely eliminating sealing gaps. This sealing structure can effectively prevent external moisture, humidity, dust, and corrosive substances from entering the joint, and can also maintain the insulation performance of the joint for a long time without being affected.

[0094] In one embodiment of the present invention; the first U-shaped conductor 15 and the first pressure plate 32 extend to the right side of the slide cylinder 11; the second U-shaped conductor 24 and the second pressure plate 41 extend to the left side of the cylinder 22; the first circular plate 21 has uniformly arranged first long grooves 7, and the first long grooves 7 correspond one-to-one with the first U-shaped conductors 15; the second circular plate 52 has uniformly arranged second long grooves 71, and the second long grooves 71 correspond one-to-one with the second U-shaped conductors 24; spring pressure plates 72 are fixed in both the first long groove 7 and the second long groove 71, and the ends of the spring pressure plates 72 are bent outward; the width of the spring pressure plates 72 is smaller than the width of the first pressure plate 32 and the second pressure plate 41.

[0095] The first U-shaped conductor 15 and the first pressure plate 32 extend beyond the right end face of the slide cylinder 11, and the second U-shaped conductor 24 and the second pressure plate 41 extend beyond the left end face of the cylinder 22. When the cylinder 22 is fully inserted into the slide cylinder 11 and the end faces of the left cylinder 1 and the right cylinder 2 are fully attached, the first U-shaped conductor 15 and the first pressure plate 32 extending to the right side of the slide cylinder 11 will simultaneously extend into the corresponding first long groove 7 on the first circular plate 21, and the second U-shaped conductor 24 and the second pressure plate 41 extending to the left side of the cylinder 22 will simultaneously extend into the corresponding second long groove 71 on the second circular plate 52.

[0096] Specifically, during the process of the first pressure plate 32 entering the first long groove 7 and the second pressure plate 41 entering the second long groove 71, the end faces of the first pressure plate 32 and the second pressure plate 41 will first contact the outwardly bent end of the spring pressure plate 72; as the first pressure plate 32 and the second pressure plate 41 continue to penetrate deeper into the first long groove 7 or the second long groove 71, they will exert a squeezing force on the bent end of the spring pressure plate 72, causing the spring pressure plate 72 to undergo elastic deformation and deflect inward toward the U-shaped conductor; when the first pressure plate 32 and the second pressure plate 41 are completely inside the long groove, the end of the spring pressure plate 72 will be inserted into the internal space of the first U-shaped conductor 15 and the second U-shaped conductor 24 respectively, and closely adhere to the outer surface of the first pressure plate 32 and the second pressure plate 41, forming a blocking effect on the first pressure plate 32 and the second pressure plate 41.

[0097] More specifically, by inserting the first U-shaped conductor 15 and the second U-shaped conductor 24 into the first long groove 7 and the second long groove 71 respectively, the ends of the first U-shaped conductor 15 and the second U-shaped conductor 24 can be blocked respectively, thereby sealing the ends of the first U-shaped conductor 15 and the second U-shaped conductor 24; at the same time, the spring pressure plate 72 will apply pressure to the first pressure plate 32 and the second pressure plate 41, so that the first pressure plate 32 and the second pressure plate 41 can better clamp the wire core and improve the fixing effect of the wire core.

[0098] A testing device for cable accessories includes a base 8; a drive groove is provided on the base 8; two drive blocks 81 slide within the drive groove; a bidirectional lead screw 82 rotates within the drive groove, and the drive blocks 81 and the bidirectional lead screw 82 are helically driven; the bidirectional lead screw 82 is driven by a motor; a fixing block 83 is fixed to the top of the two drive blocks 81, and a semi-circular groove is provided on the top of the fixing block 83; a clamping block 84 is provided on the top of the fixing block 83; a semi-circular groove is also provided on the bottom of the clamping block 84; two locking bolts are inserted into the clamping block 84; and two threaded grooves are provided on the top of the fixing block 83.

[0099] When testing the cable accessories after connection, first place the two connected cables in the semi-circular grooves on the top of the two fixing blocks 83, so that the outer sheath of the cable fits tightly against the inner wall of the semi-circular groove; then place the clamping block 84 on top of the fixing block 83, so that the semi-circular groove at the bottom of the clamping block 84 is aligned with the upper part of the cable, insert the two locking bolts into the through holes on the clamping block 84, and tighten the locking bolts so that they are screwed into the threaded groove on the top of the fixing block 83, thereby firmly clamping the cable in the circular space between the clamping block 84 and the fixing block 83; after the cable is fixed, first perform an initial continuity test: connect one end of the cable to the power supply, and connect the other end of the cable to the electrical component, and observe the working status of the electrical component after the power is turned on, so as to determine whether the internal electrical connection of the cable accessory is normal and conductive.

[0100] Specifically, after the initial connectivity test is completed, a cable connection tightness test is performed: the motor is started, and the motor drives the bidirectional lead screw 82 to rotate. Since the threads at both ends of the bidirectional lead screw 82 rotate in opposite directions, when the bidirectional lead screw 82 rotates, the two drive blocks 81 will move synchronously along the drive groove in a direction away from each other, thereby driving the two fixed blocks 83 and the clamping block 84 to move away from each other, applying an axial tensile force to the cable clamped in the middle; by controlling the number of rotations of the motor, the magnitude of the tensile force can be precisely adjusted to simulate the external force that the cable may be subjected to during actual operation; after the tightness test is completed, a connectivity test is performed again: keeping the cable in a tensile state, one end of the cable is reconnected to the power supply, and the other end is reconnected to the electrical component. After the power is turned on, the working status of the electrical component is observed to determine whether the internal electrical connection of the cable accessory remains reliable after being subjected to external force, and whether there are problems such as poor contact or disconnection.

[0101] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0102] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cable accessory, comprising an intermediate joint; characterized in that, The intermediate joint includes a left cylinder (1) and a right cylinder (2); The left cylinder (1) is provided with a slide cylinder (11); the outer ring of the slide cylinder (11) is fixed with evenly arranged sliders (12); the inner ring of the left cylinder (1) is provided with evenly arranged slide tracks (13); the slide cylinder (11) is made of insulating plastic material; The inner ring of the slide cylinder (11) is provided with uniformly arranged first notches (14); each first notch (14) is fixed with a first U-shaped conductor (15), and the opening of the first U-shaped conductor (15) faces the outer ring of the slide cylinder (11). The slide tube (11) is provided with a first locking assembly; A first circular plate (21) is fixed inside the right cylinder (2); a cylinder (22) is fixed to the left side of the first circular plate (21); the cylinder (22) and the circular plate are made of insulating plastic material; The outer ring of the cylinder (22) is provided with evenly arranged second notches (23); each second notch (23) is fixed with a second U-shaped conductor (24), and part of the second U-shaped conductor (24) is exposed from the second notch (23); the opening of the second U-shaped conductor (24) faces the inner ring of the cylinder (22); The first circular plate (21) has a uniformly arranged first inlet groove (25) on its right end face; The cylinder (22) is provided with a second locking assembly; The left cylinder (1) and the right cylinder (2) are each provided with a fixing component on opposite sides; The outer rings of the left cylinder (1) and the right cylinder (2) are both threaded; the outer ring of the right cylinder (2) is threaded to engage with the first threaded cylinder (26).

2. The cable accessory according to claim 1, characterized in that: The first locking assembly includes a rotating ring (3); an annular groove (31) is provided on the right side of the slider (12) on the outer ring of the slide cylinder (11); the rotating ring (3) rotates within the annular groove (31); A first pressure plate (32) slides within a plurality of the first U-shaped conductors (15); a first push plate (33) is fixed to the side of the first pressure plate (32) facing the opening of the first U-shaped conductor (15); the first push plate (33) extends into the annular groove (31); The rotating ring (3) has a first spiral groove (34) on the side of the first push plate (33) facing the rotating ring (3); the first push plate (33) has an arc-shaped tooth (35) fixed on the side of the rotating ring (3), and the arc-shaped tooth (35) slides in the first spiral groove (34); The rotating ring (3) and the first push plate (33) are made of insulating plastic material; A second pressure plate (41) slides inside the second U-shaped conductor (24); a second push plate (42) is fixed on the side of the second pressure plate (41) facing the inner ring of the cylinder (22), and the second push plate (42) extends to the inner ring of the cylinder (22); The second locking assembly includes a turntable (4); the inner ring of the cylinder (22) has the turntable (4) rotating; the turntable (4) has a second spiral groove (43) on the side facing the second push plate (42); the second push plate (42) extends to one side surface of the turntable (4); the second push plate (42) also has arc-shaped teeth (35) on the side facing the turntable (4), and the arc-shaped teeth (35) slide in the second spiral groove (43); The turntable (4) and the second push plate (42) are made of insulating plastic material; The outer ring of the rotating ring (3) has a toothed groove; the left end of the rotating disk (4) has a hexagonal groove.

3. The cable accessory according to claim 2, characterized in that: The bottom surfaces inside both the first U-shaped conductor (15) and the second U-shaped conductor (24) are arc surfaces; The side of the first pressure plate (32) facing the inner bottom surface of the first U-shaped conductor (15) is also an arc surface; the side of the second pressure plate (41) facing the inner bottom surface of the second U-shaped conductor (24) is also an arc surface.

4. The cable accessory according to claim 1, characterized in that: The first U-shaped conductor (15) has a fan-shaped groove (27) on the side surface opposite to its own opening; The second U-shaped conductor (24) has a fan-shaped conductor (28) fixed on the side surface opposite to its opening, and the fan-shaped conductor (28) corresponds one-to-one with the fan-shaped groove (27).

5. The cable accessory according to claim 1, characterized in that: The fixing component includes a connecting cylinder (5); a mounting ring block (51) is fixed on the left side of the connecting cylinder (5), and the outer ring of the mounting ring block (51) is threaded. The inner rings of the left cylinder (1) and the right cylinder (2) are also provided with threads that mesh with the outer ring threads of the mounting ring block (51); The left side of the slide cylinder (11) is fixed with a second circular plate (52), and the second circular plate (52) slides inside the left cylinder (1); the left end face of the second circular plate (52) is provided with a uniformly arranged second inlet groove (53), and the second inlet groove (53) corresponds one-to-one with the first U-shaped conductor (15).

6. The cable accessory according to claim 5, characterized in that: The two mounting ring blocks (51) have annular cavities on one side surface facing the first circular plate (21) and the second circular plate (52), respectively; An annular shaft (54) rotates within the annular cavity; an annular plate (55) is fixed on the annular shaft (54); a silicone rubber ring (56) is fixed on the annular plate (55), and the silicone rubber ring (56) is soft in texture.

7. The cable accessory according to claim 6, characterized in that: The outer ring of the connecting cylinder (5) has two arc-shaped groove groups; each of the two arc-shaped groove groups includes multiple evenly arranged arc-shaped grooves (6), which are respectively opened on the outer ring of the connecting cylinder (5); The arc grooves (6) in the two arc groove groups are staggered; each arc groove (6) has a sliding extrusion block (61); the side of the extrusion block (61) away from the mounting ring plate (55) is inclined; a rubber block (62) is fixed on the side of the extrusion block (61) facing the inner ring of the connecting cylinder (5); the sides of the rubber blocks (62) in the staggered arc grooves (6) are in contact with each other; The outer ring of the connecting cylinder (5) is threaded; the outer ring of the connecting cylinder (5) is threaded to a second threaded cylinder (63).

8. The cable accessory according to claim 7, characterized in that: The second threaded cylinder (63) has a retaining shaft (64) on its left side; The connecting cylinder (5) has a cylindrical groove, and the retaining shaft (64) slides in the cylindrical groove and is connected to a spring.

9. The cable accessory according to claim 8, characterized in that: The first U-shaped conductor (15) and the first pressure plate (32) extend to the right side of the slide (11); The second U-shaped conductor (24) and the second pressure plate (41) extend to the left side of the cylinder (22); The first circular plate (21) has uniformly arranged first long grooves (7), and the first long grooves (7) correspond one-to-one with the first U-shaped conductor (15); The second circular plate (52) has evenly arranged second long slots (71), and the second long slots (71) correspond one-to-one with the second U-shaped conductor (24); Spring pressure plates (72) are fixed in both the first long groove (7) and the second long groove (71), and the ends of the spring pressure plates (72) are bent outward; the width of the spring pressure plates (72) is smaller than the width of the first pressure plate (32) and the second pressure plate (41).

10. A testing apparatus for cable accessories, used to test the cable accessories according to any one of claims 1-9, characterized in that: Includes a base (8); the base (8) has a drive groove; two drive blocks (81) slide in the drive groove; A bidirectional lead screw (82) rotates inside the drive slot, and the drive block (81) and the bidirectional lead screw (82) are driven by a screw; the bidirectional lead screw (82) is driven by a motor; a fixing block (83) is fixed on the top of the two drive blocks (81), and a semi-circular groove is opened on the top of the fixing block (83); The top of the fixing block (83) is provided with a clamping block (84); the bottom of the clamping block (84) is also provided with a semi-circular groove; two locking bolts are inserted on the clamping block (84); and two threaded grooves are provided on the top of the fixing block (83).

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