High-strength cable fitting intermediate joint conductor connection structure

Abstract

The utility model discloses a high-strength cable fitting intermediate joint conductor connection structure, and relates to the technical field of power transmission. The fixing device comprises a fixing part and a connecting part. According to the utility model, through the arrangement of the fixing part, after the two sleeves I are respectively sleeved on the outer walls of the two cables, the sleeves II can be twisted, and through the mutual cooperation of the connecting internal threads and the connecting external threads, the connecting internal threads are twisted on the outer walls of the sleeves I, so that the inclined surfaces on the sleeves II extrude the plurality of elastic clamping pieces; the multiple clamping teeth on the elastic clamping piece are clamped on a rubber jacket of a cable, at the moment, the positioning ring can be pulled to extrude the spring, and after the first sleeve is fixed, the positioning ring can be loosened, so that the multiple clamping teeth of the positioning ring can be respectively clamped into the clamping grooves to lock rotation of the second sleeve under the action of reverse elastic force of the spring; and fixing looseness of the first sleeve is prevented, the firmness after overall fixing is improved, and the durability and reliability of the structure are further enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of power transmission, and particularly relates to a conductor connection structure for an intermediate joint of a high-strength cable fitting. Background Technique

[0002] With the continuous expansion of the power grid scale and the rapid growth of power demand, higher requirements are imposed on power transmission. On the one hand, the cable needs to carry a larger current load to meet the increasing power consumption demand. On the other hand, in complex and changeable laying environments, such as special scenarios like urban underground utility tunnels, mountainous areas, cross-river and cross-sea areas, the cable not only needs to have good mechanical properties to resist external force impacts and squeezes, but also needs to ensure the stability of electrical performance to prevent faults such as leakage and short circuits. This has made the application of high-strength cables more and more extensive, and the importance of the conductor connection structure for the intermediate joint supporting it has become increasingly prominent.

[0003] In power transmission, the existing conductor connection structure for the intermediate joint is difficult to be firmly fixed on the cable rubber outer sheath. Due to the elasticity and flexibility of the rubber outer sheath, it is difficult for conventional fixing methods to generate sufficient friction and fastening force. During operation, when the cable is subjected to external forces such as construction dragging, building settlement, and environmental vibration, the connection part is prone to looseness, resulting in a reduction in the conductor contact area and an increase in resistance, leading to poor contact. Content of the Utility Model

[0004] The purpose of the utility model is to provide a conductor connection structure for an intermediate joint of a high-strength cable fitting. By providing a fixing part, multiple teeth can be respectively inserted into the card slots to lock the rotation of the second sleeve, preventing the fixing of the first sleeve from loosening, improving the firmness after overall fixing, further enhancing the durability and reliability of the structure, and solving the problem that it is difficult for conventional fixing methods to generate sufficient friction and fastening force, and during operation, when the cable is subjected to external forces such as construction dragging, building settlement, and environmental vibration, the connection part is prone to looseness.

[0005] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] The utility model is a conductor connection structure for an intermediate joint of a high-strength cable fitting, including two cables.

[0007] Fixing parts, there are two fixing parts, and the two fixing parts are respectively arranged on the outer walls of the two cables; and

[0008] Connection parts, a connection part is arranged between the two cables for hermetically fixing the connection part between the two cables;

[0009] Wherein, the two fixing parts fix the connection part on the outer walls of the two cables, and fix and seal the conductor metal between the two cables through the connection part.

[0010] Further, the fixing part includes:

[0011] Fixing members, two of the fixing members are respectively located on the outer walls of two cables; and

[0012] Locking members, the locking members are installed on both of the fixing members to further lock the fixed installation of the fixing members;

[0013] Wherein, after the connecting parts are respectively fixed on the outer walls of the two cables by the fixing members, the fixing effect of the fixing members is further strengthened in cooperation with the locking members to prevent loosening after installation.

[0014] Further, the fixing member includes a first sleeve arranged on the outer wall of the cable. An external connecting thread is provided on the outer wall of the first sleeve. A plurality of elastic clamping pieces are fixedly connected to the first sleeve. The plurality of elastic clamping pieces are all distributed on the outer wall of the cable. A second sleeve is arranged on the outer wall of the first sleeve. An internal connecting thread is provided on the inner wall of the second sleeve. The internal connecting thread is adapted to the external connecting thread. An inclined surface is provided on the inner wall of the second sleeve. The inclined surface is adapted to the outer wall of the elastic clamping piece. Biting teeth are fixedly connected to the inner walls of the plurality of elastic clamping pieces;

[0015] Wherein, the first sleeve is sleeved on the outer wall of the cable, and the second sleeve is twisted and sleeved on the outer wall of the first sleeve through the external connecting thread and the internal connecting thread, so that the inclined surface on the inner wall of the second sleeve presses the plurality of elastic clamping pieces and the biting teeth on the inner walls of the elastic clamping pieces bite the rubber outer wall of the cable, and the first sleeve is firmly fixed on the outer wall of the cable.

[0016] Further, the locking member includes a fixing ring fixedly connected to the outer wall of the second sleeve. A plurality of card slots are provided on the fixing ring. A positioning ring is arranged on the outer wall of the first sleeve. A plurality of teeth are fixedly connected to the outer wall of the positioning ring. The plurality of teeth are respectively adapted to the plurality of card slots;

[0017] Wherein, the second sleeve is twisted to rotate so that the plurality of card slots on the fixing ring are adapted to the plurality of teeth on the positioning ring, and the rotation of the second sleeve is locked.

[0018] Further, a plurality of sliding grooves are provided on the inner wall of the first sleeve. Slide bars are slidably connected to the inner walls of the plurality of sliding grooves. One ends of the plurality of slide bars away from the sliding grooves are fixedly connected to the positioning ring. Springs are wound around the outer walls of the plurality of slide bars. One ends of the plurality of springs are fixedly connected to the positioning ring. The other ends of the plurality of springs are fixedly connected to the first sleeve;

[0019] Among them, multiple springs are in a compressed state. The multiple compressed springs drive the positioning ring away from the sleeve and make multiple teeth on the positioning ring fit against the inner wall of the card slot. The resilience generated by the springs makes the connection between the card slot and the teeth closer.

[0020] Further, the connecting part includes:

[0021] a connecting piece, which is fixed on one of the two sleeves; and

[0022] a fastener, which is located outside the connecting piece;

[0023] Among them, after the two cables are connected, the connecting piece can splice and seal the connection part and fix the connection part through the fastener.

[0024] Further, the connecting piece includes a first connecting sleeve and a second connecting sleeve respectively and fixedly connected to the adjacent sides of the two sleeves. An inner sleeve is fixedly connected to the inner wall of the first connecting sleeve. The inner sleeve is slidably connected to the inner wall of the second connecting sleeve. Sealing rings are arranged inside the first connecting sleeve and the second connecting sleeve. The two sealing rings are respectively sleeved on the outer walls of the two cables. A second sealing ring is arranged between the first connecting sleeve and the second connecting sleeve;

[0025] Among them, the two sealing rings are respectively located inside the first connecting sleeve and the second connecting sleeve. The two sealing rings and the second sealing ring seal the connection part after the first connecting sleeve and the second connecting sleeve are spliced through the inner sleeve.

[0026] Further, the fastener includes a plurality of metal fixing pieces fixedly connected to the outer walls of the first connecting sleeve and the second connecting sleeve. A bolt is threadedly connected between the corresponding two first connecting sleeves. Nuts are threadedly connected to the outer walls of the plurality of bolts;

[0027] Among them, the first connecting sleeve and the second connecting sleeve are fixed through a plurality of metal fixing pieces and bolts, and the threaded connection is further locked through a plurality of nuts.

[0028] The utility model has the following beneficial effects:

[0029] 1. By providing a fixing part, after sleeving two sleeve ones on the outer walls of two cables respectively, the sleeve two can be twisted. Through the mutual cooperation of the connecting internal thread and the connecting external thread, the connecting internal thread is screwed on the outer wall of the sleeve one, and then the inclined surface on the sleeve two squeezes a plurality of elastic clips, and a plurality of biting teeth on the elastic clips are stuck on the rubber outer sleeve of the cable. At this time, the fixing ring and the positioning ring on the sleeve one approach each other. At this time, the positioning ring can be pulled to squeeze the spring. After fixing the sleeve one, the positioning ring can be released, so that under the reverse elastic force of the spring, a plurality of cogs can be respectively stuck into the card slots to lock the rotation of the sleeve two, prevent the fixing of the sleeve one from loosening, improve the firmness after overall fixing, and further enhance the durability and reliability of the structure.

[0030] 2. By providing a connecting part, after fixing the connecting sleeve one and the connecting sleeve two on the outer walls of two cables respectively through the fixing part, the connection between the two cables can be wired, and the inner sleeve is inserted into the connecting sleeve two. After locking the corresponding two metal fixing pieces by twisting the bolts and nuts, the sealing ring one and the sealing ring two can seal the connection between the connecting sleeve two and the connecting sleeve one, prevent external impurities and dust from falling into the connection and affecting the connection of the cables, and improve the sealing performance of the overall device.

[0031] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0034] Figure 2 It is a schematic diagram of the structure of the connecting part of the present utility model;

[0035] Figure 3 It is a schematic diagram of the structure of the fixing part of the present utility model;

[0036] Figure 4 is Figure 2 The enlarged schematic diagram of part A in

[0037] Figure 5 is Figure 3 The enlarged schematic diagram of part B in

[0038] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0039] 1. Fixed part; 2. Connection part; 3. Cable;

[0040] 11. Fixing member; 111. First sleeve; 112. External connecting thread; 113. Elastic clip; 114. Second sleeve; 115. Internal connecting thread; 116. Inclined surface; 117. Biting teeth;

[0041] 12. Locking member; 121. Fixed ring; 122. Card slot; 123. Positioning ring; 124. Card teeth; 125. Slide groove; 126. Slide bar; 127. Spring;

[0042] 21. Connecting member; 211. First connecting sleeve; 212. Second connecting sleeve; 213. Inner sleeve; 214. First sealing ring; 215. Second sealing ring;

[0043] 22. Fastening member; 221. Metal fixing piece; 222. Bolt; 223. Nut. Detailed implementation manners

[0044] 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 making creative efforts belong to the protection scope of the present invention.

[0045] Please refer to Figures 1-5 As shown, the present invention is a conductor connection structure for a high-strength cable fitting intermediate joint, including two cables 3,

[0046] Fixed parts 1, there are two fixed parts 1, and the two fixed parts 1 are respectively arranged on the outer walls of the two cables 3; and

[0047] Connection part 2, a connection part 2 is arranged between the two cables 3 for sealing and fixing the connection part between the two cables 3;

[0048] Among them, the two fixed parts 1 fix the connection part 2 on the outer walls of the two cables 3, and fix and seal the conductor metal between the two cables 3 through the connection part 2.

[0049] The fixed part 1 includes:

[0050] Fixing members 11, the two fixing members 11 are respectively located on the outer walls of the two cables 3; and

[0051] Locking members 12, the two fixing members 11 are both equipped with locking members 12 to further lock the fixed installation of the fixing members 11;

[0052] Among them, after the fixing member 11 fixes the connecting portion 2 on the outer walls of the two cables 3 respectively, the locking member 12 is used to further strengthen the fixing effect of the fixing member 11 to prevent loosening after installation.

[0053] The fixing member 11 includes a first sleeve 111 arranged on the outer wall of the cable 3. The outer wall of the first sleeve 111 is provided with an external connecting thread 112. A plurality of elastic clips 113 are fixedly connected to the first sleeve 111. The plurality of elastic clips 113 are evenly distributed on the outer wall of the cable 3. A second sleeve 114 is arranged on the outer wall of the first sleeve 111. The inner wall of the second sleeve 114 is provided with an internal connecting thread 115. The internal connecting thread 115 is adapted to the external connecting thread 112. The inner wall of the second sleeve 114 is provided with an inclined surface 116. The inclined surface 116 is adapted to the outer wall of the elastic clip 113. The inner walls of the plurality of elastic clips 113 are fixedly connected with bite teeth 117;

[0054] Among them, the first sleeve 111 is sleeved on the outer wall of the cable 3, and the second sleeve 114 is twisted and sleeved on the outer wall of the first sleeve 111 through the external connecting thread 112 and the internal connecting thread 115, so that the inclined surface 116 on the inner wall of the second sleeve 114 squeezes the plurality of elastic clips 113 and the bite teeth 117 on the inner walls of the elastic clips 113 bite tightly on the rubber outer wall of the cable 3, and the first sleeve 111 is firmly fixed on the outer wall of the cable 3.

[0055] The locking member 12 includes a fixing ring 121 fixedly connected to the outer wall of the second sleeve 114. A plurality of card slots 122 are opened on the fixing ring 121. A positioning ring 123 is arranged on the outer wall of the first sleeve 111. A plurality of card teeth 124 are fixedly connected to the outer wall of the positioning ring 123. The plurality of card teeth 124 are respectively adapted to the plurality of card slots 122;

[0056] Among them, the second sleeve 114 is twisted and rotated so that the plurality of card slots 122 on the fixing ring 121 are adapted to the plurality of card teeth 124 on the positioning ring 123, and the rotation of the second sleeve 114 is locked.

[0057] A plurality of sliding grooves 125 are opened on the inner wall of the first sleeve 111. A sliding rod 126 is slidably connected to the inner wall of each of the plurality of sliding grooves 125. One end of each of the plurality of sliding rods 126 away from the sliding groove 125 is fixedly connected to the positioning ring 123. Springs 127 are wound around the outer walls of the plurality of sliding rods 126. One end of each of the plurality of springs 127 is fixedly connected to the positioning ring 123, and the other end of each of the plurality of springs 127 is fixedly connected to the first sleeve 111;

[0058] Among them, multiple springs 127 are all in a compressed state. The multiple compressed springs 127 drive the positioning ring 123 away from the first sleeve 111 and make multiple teeth 124 on the positioning ring 123 fit against the inner wall of the slot 122, making the connection between the slot 122 and the teeth 124 tighter by the resilience generated by the springs 127.

[0059] By providing the fixing part 1, the fixing of the first sleeve 111 is prevented from loosening, improving the firmness after overall fixing, and further enhancing the durability and reliability of the structure.

[0060] The connecting part 2 includes:

[0061] A connecting member 21, which is fixed on the two first sleeves 111; and

[0062] A fastening member 22, which is located outside the connecting member 21;

[0063] Among them, after the two cables 3 are connected, the connecting member 21 can splice and seal the connection part and fix the connection part through the fastening member 22.

[0064] The connecting member 21 includes a first connecting sleeve 211 and a second connecting sleeve 212 respectively and fixedly connected to the adjacent sides of the two first sleeves 111. An inner sleeve 213 is fixedly connected to the inner wall of the first connecting sleeve 211. The inner sleeve 213 is slidably connected to the inner wall of the second connecting sleeve 212. A first sealing ring 214 is provided inside both the first connecting sleeve 211 and the second connecting sleeve 212. The two first sealing rings 214 are respectively sleeved on the outer walls of the two cables 3. A second sealing ring 215 is provided between the first connecting sleeve 211 and the second connecting sleeve 212;

[0065] Among them, the two first sealing rings 214 are respectively located inside the first connecting sleeve 211 and the second connecting sleeve 212. The two first sealing rings 214 and the second sealing ring 215 seal the connection part after the first connecting sleeve 211 and the second connecting sleeve 212 are spliced through the inner sleeve 213.

[0066] The fastening member 22 includes a plurality of metal fixing pieces 221 fixedly connected to the outer walls of the first connecting sleeve 211 and the second connecting sleeve 212. A bolt 222 is threadedly connected between the corresponding two first connecting sleeves 211. Nuts 223 are threadedly connected to the outer walls of the plurality of bolts 222;

[0067] Among them, the first connecting sleeve 211 and the second connecting sleeve 212 are fixed by the plurality of metal fixing pieces 221 and the bolts 222, and the threaded connection is further locked by the plurality of nuts 223;

[0068] By providing a connecting portion 2, after locking between two corresponding metal fixing pieces 221 by twisting a bolt 222 and a nut 223, a first sealing ring 214 and a second sealing ring 215 can seal the connection between a second connecting sleeve 212 and a first connecting sleeve 211, preventing external impurities and dust from falling into the connection and affecting the connection of the cable 3, and improving the sealing performance of the overall device.

[0069] A specific application of this embodiment is as follows: By providing a fixing portion 1, after respectively sleeving two first sleeves 111 on the outer walls of two cables 3, the second sleeve 114 can be twisted. Through the mutual cooperation of an internal connecting thread 115 and an external connecting thread 112, the internal connecting thread 115 is screwed on the outer wall of the first sleeve 111, so that the inclined surface 116 on the second sleeve 114 presses a plurality of elastic clips 113, and a plurality of teeth 117 on the elastic clips 113 are stuck on the rubber outer sleeve of the cable 3. At this time, a fixing ring 121 on the first sleeve 111 and a positioning ring 123 approach each other. At this time, the positioning ring 123 can be pulled to compress the spring 127. After the first sleeve 111 is fixed, the positioning ring 123 can be released. Under the reverse elastic force of the spring 127, a plurality of teeth 124 can respectively be stuck into the card slots 122 to lock the rotation of the second sleeve 114, preventing the fixing of the first sleeve 111 from loosening, improving the firmness after overall fixing, and further enhancing the durability and reliability of the structure.

[0070] By providing a connecting portion 2, after respectively fixing the first connecting sleeve 211 and the second connecting sleeve 212 on the outer walls of two cables 3 through the fixing portion 1, wiring can be performed on the connection between the two cables 3, and the inner sleeve 213 is inserted into the second connecting sleeve 212. After locking between two corresponding metal fixing pieces 221 by twisting a bolt 222 and a nut 223, a first sealing ring 214 and a second sealing ring 215 can seal the connection between the second connecting sleeve 212 and the first connecting sleeve 211, preventing external impurities and dust from falling into the connection and affecting the connection of the cable 3, and improving the sealing performance of the overall device.

[0071] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0072] The preferred embodiments of the present utility model disclosed above are only used to help explain the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A conductor connection structure for the middle joint of a high-strength cable fitting, comprising two cables, characterized in that: Fixing parts, there are two fixing parts, and the two fixing parts are respectively arranged on the outer walls of the two cables; and A connecting part is arranged between the two cables for hermetically fixing the connecting part between the two cables; Wherein, the two fixing parts fix the connecting part on the outer walls of the two cables, and the conductor metal between the two cables is hermetically fixed through the connecting part.

2. The conductor connection structure of the intermediate joint of a high-strength cable fitting according to claim 1, characterized in that, The fixing part includes: Fixing pieces, the two fixing pieces are respectively located on the outer walls of the two cables; and Locking pieces, locking pieces are installed on both of the two fixing pieces to further lock the fixed installation of the fixing pieces; Wherein, after the fixing pieces respectively fix the connecting parts on the outer walls of the two cables, the cooperation of the locking pieces further strengthens the fixing effect of the fixing pieces to prevent loosening after installation.

3. The conductor connection structure of the intermediate joint of a high-strength cable fitting according to claim 2, characterized in that, The fixing piece includes a first sleeve arranged on the outer wall of the cable. The outer wall of the first sleeve is provided with external connection threads. A plurality of elastic clip pieces are fixedly connected to the first sleeve. The plurality of elastic clip pieces are all distributed on the outer wall of the cable. A second sleeve is arranged on the outer wall of the first sleeve. The inner wall of the second sleeve is provided with internal connection threads, and the internal connection threads are adapted to the external connection threads. The inner wall of the second sleeve is provided with an inclined surface, and the inclined surface is adapted to the outer wall of the elastic clip piece. The inner walls of the plurality of elastic clip pieces are all fixedly connected with biting teeth; Wherein, the first sleeve is sleeved on the outer wall of the cable, and the second sleeve is twisted and sleeved on the outer wall of the first sleeve through the external connection threads and the internal connection threads, so that the inclined surface on the inner wall of the second sleeve presses a plurality of elastic clip pieces and the biting teeth on the inner walls of the elastic clip pieces bite tightly on the rubber outer wall of the cable, and the first sleeve is firmly fixed on the outer wall of the cable.

4. A conductor connection structure for an intermediate joint of a high-strength cable fitting according to claim 3, characterized in that The locking piece includes a fixing ring fixedly connected to the outer wall of the second sleeve. A plurality of card slots are opened on the fixing ring. A positioning ring is arranged on the outer wall of the first sleeve. A plurality of teeth are fixedly connected to the outer wall of the positioning ring. The plurality of teeth are respectively adapted to the plurality of card slots; Wherein, the second sleeve is twisted and rotated so that a plurality of card slots on the fixing ring are adapted to a plurality of teeth on the positioning ring, and the rotation of the second sleeve is locked.

5. The conductor connection structure of the intermediate joint of a high-strength cable fitting according to claim 4, characterized in that, A plurality of sliding grooves are opened on the inner wall of the first sleeve. Slide rods are slidably connected to the inner walls of the plurality of sliding grooves. One ends of the plurality of slide rods away from the sliding grooves are fixedly connected to the positioning ring. Springs are wound around the outer walls of the plurality of slide rods. One ends of the plurality of springs are fixedly connected to the positioning ring, and the other ends of the plurality of springs are fixedly connected to the first sleeve; Wherein, the plurality of springs are all in a compressed state. The plurality of compressed springs drive the positioning ring away from the first sleeve and make the plurality of teeth on the positioning ring fit with the inner walls of the card slots, and the connection between the card slots and the teeth is made closer through the resilience generated by the springs.

6. The conductor connection structure of the intermediate joint of a high-strength cable fitting according to claim 5, characterized in that, The connecting part includes: A connecting piece, the connecting piece is fixed on the two first sleeves; and A fastening piece, the fastening piece is located outside the connecting piece; Wherein, after the two cables are connected, the connecting piece can splice and seal the connection part and fix the connection part through the fastening piece.

7. A conductor connection structure for an intermediate joint of a high-strength cable fitting according to claim 6, characterized in that, The connecting piece includes a first connecting sleeve and a second connecting sleeve respectively and fixedly connected to the closer sides of two first sleeves. An inner sleeve is fixedly connected to the inner wall of the first connecting sleeve. The inner sleeve is slidably connected to the inner wall of the second connecting sleeve. A first sealing ring is arranged inside each of the first connecting sleeve and the second connecting sleeve. The two first sealing rings are respectively sleeved on the outer walls of two cables. A second sealing ring is arranged between the first connecting sleeve and the second connecting sleeve; Wherein, the two first sealing rings are respectively located inside the first connecting sleeve and the second connecting sleeve. After the first connecting sleeve and the second connecting sleeve are spliced through the inner sleeve, the two first sealing rings and the second sealing ring perform a sealing treatment on the joint.

8. A conductor connection structure for an intermediate joint of a high-strength cable fitting according to claim 7, characterized in that, The fastening piece includes a plurality of metal fixing pieces fixedly connected to the outer walls of the first connecting sleeve and the second connecting sleeve respectively. A bolt is threadedly connected between corresponding two first connecting sleeves. Nuts are threadedly connected to the outer walls of a plurality of the bolts; Wherein, the first connecting sleeve and the second connecting sleeve are fixed by a plurality of metal fixing pieces and bolts, and the threaded connection is further locked by a plurality of nuts.

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