A 5G multifunctional smart lamp pole using basalt fiber composite materials

Abstract

The present invention belongs to the technical field of lamp poles, specifically a 5G multifunctional smart lamp pole using basalt fiber composite materials, including a base, the top of the base is fixedly connected to a lower rod body, the interior of the lower rod body is provided with a plurality of connecting pipes that are mutually sleeved and axially slidable, the interior of the connecting pipe is slidably connected to an upper rod body, and the lamp pole body is formed by a lifting mechanism, the plurality of connecting pipes that are mutually sleeved and the lower rod body, and a mounting device is installed on the outer wall of the upper rod body. The present invention adopts a retractable manner, and the staff can lift the present invention by connecting an external motor, which improves the installation efficiency of the present invention, eliminates the need for the staff to climb to a high place to inspect the light source, improves the inspection and replacement efficiency of the intelligent light source, and improves the safety of the staff; the present invention is retractable, reduces the occupied space and is easy to transport.

Description

Technical Field

[0001] The present invention belongs to the technical field of lamp poles, and specifically relates to a 5G multifunctional smart lamp pole using basalt fiber composite materials. Background Art

[0002] The fifth generation of mobile communication technology, referred to as 5G, is a new generation of broadband mobile communication technology with the characteristics of high speed, low latency and large connection. 5G communication facilities are the network infrastructure for realizing the interconnection of man, machine and things.

[0003] The 5G multifunctional smart light pole made of basalt fiber composite material is not only high in strength, but also has many excellent properties such as electrical insulation, corrosion resistance and high temperature resistance. The 5G multifunctional smart light pole is a new type of information infrastructure that uses the light pole as a carrier and integrates multiple functions into one by stacking port reservations and other methods. Since the existing smart light poles are usually integrated, the length of the street lamps is about 6 meters to 12 meters, which is very inconvenient to transport. In addition, the production cost, logistics cost and installation cost of the integrated smart light pole are high, and the later replacement is inconvenient and the replacement cost is high. The height of the light pole cannot be adjusted, and it is difficult to upgrade and maintain, and standardized production cannot be achieved.

[0004] After searching, the Chinese patent with announcement number CN113124361B discloses an assembled smart light pole. Through the use of mortise and tenon joints in multiple places, the staff can choose to start disassembly from any place, and the pole body is interchangeable, which improves the efficiency of disassembly and assembly of the smart light pole, thereby improving the transportation efficiency of the light pole; improves the efficiency of maintenance and replacement of mounting equipment; the pole body is detachable, and optimizes the loading space. However, when splicing the assembled smart light pole, it needs to be spliced ​​from bottom to top, which not only consumes a lot of time, but also requires the staff to climb to the corresponding height to work when splicing higher parts and installing mounting equipment, which is inconvenient to use. Summary of the invention

[0005] The purpose of the present invention is to provide a 5G multifunctional smart lamp pole using basalt fiber composite materials to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a 5G multifunctional smart lamp pole using basalt fiber composite materials, comprising a base, the top of the base is fixedly connected to a lower rod body, the interior of the lower rod body is provided with a plurality of connecting tubes which are mutually socketed and axially slidable, the interior of the connecting tube is slidably connected to an upper rod body, and the lamp pole body is formed by cooperation with the plurality of connecting tubes which are mutually socketed and the lower rod body through a lifting mechanism, a limiting mechanism is provided on the outer wall of the lamp pole body, and a mounting device is installed on the outer wall of the upper rod body.

[0007] Furthermore, the lifting mechanism includes an internal threaded tube located at the center position of the lower rod body and multiple groups of double-sided threaded tubes inside the internal threaded tube that are mutually socketed and axially slidable, a threaded rod that is adapted to the double-sided threaded tube is provided on the inner wall of the upper rod body, a pressing block and a first spring sheet that is adapted to the pressing block are rotatably connected on the outer walls of the internal threaded tube and the threaded rod, a connecting strip that is adapted to the pressing block is provided on the outer wall of the internal threaded tube, a gear that is adapted to the connecting strip is provided on the outer wall of the internal threaded tube, a limit strip is meshed on the outer wall of the gear away from the connecting strip, and both ends of the limit strip are slidably connected to the inner wall of the internal threaded tube, and a limit groove that is adapted to the limit strip is provided on the inner wall of the bottom end of the internal threaded tube.

[0008] Furthermore, the lifting mechanism also includes a through hole opened on the outer wall of the bottom end of the lower rod body, a cover plate adapted to the through hole and a limit piece adapted to the limit groove, and the limit piece is composed of a slider and a top plate. The top end of the base is located at the center position inside the lower rod body and is provided with a right-angle diverter adapted to the internal threaded tube, and a connection port is provided at one end of the right-angle diverter facing the through hole.

[0009] Furthermore, the limiting mechanism includes a connecting sleeve and a limiting sleeve adapted for the connection between multiple groups of connecting pipes, the limiting sleeve is symmetrically provided with a fixing groove on one end close to the connecting sleeve, a connecting block adapted to the fixing groove is provided on the side of the connecting sleeve close to the limiting sleeve, a connecting plate is rotatably connected inside the limiting sleeve, a limiting column adapted to the connecting block is provided on one end of the connecting plate close to the connecting block, a second spring sheet adapted to the connecting plate is provided inside the limiting sleeve, a supporting block is provided on the side of the connecting sleeve and the limiting sleeve close to the direction of the connecting pipe, and a connecting hole adapted to the supporting block is provided on the top outer wall of the connecting pipe.

[0010] Furthermore, the limiting mechanism also includes a limiting plate buckled on the outer wall of the limiting sleeve facing the connecting block, and a fastener penetrating the center of the limiting plate and the connecting block and pressing the outer wall of the connecting pipe.

[0011] Furthermore, the mounting device includes an intelligent light source and a connecting groove opened on the outer wall of the upper rod body, a slide plate adapted to the connecting groove is provided at one end of the intelligent light source close to the upper rod body, a block is fixedly connected to the bottom end of the slide plate, and a fixing sleeve adapted to the upper rod body is provided at one end of the intelligent light source close to the upper rod body, bolts penetrate the outer wall of the fixing sleeve, and a threaded hole adapted to the bolt is provided on the top outer wall of the upper rod body.

[0012] Furthermore, the upper rod body and the outer walls of multiple groups of connecting tubes that are mutually socketed and axially slidable are provided with connecting grooves, the limiting sleeve is provided with a groove that matches the blocking block on one side close to the connecting tube, and the connecting sleeve and the limiting sleeve are both provided with grooves that match the blocking block on one side close to the connecting tube.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention adopts a retractable manner, and the staff can lift the present invention by connecting an external motor, which improves the installation efficiency of the present invention. The staff does not need to climb to a high place to inspect the light source, which improves the inspection and replacement efficiency of the intelligent light source and improves the safety of the staff. The present invention is retractable, which reduces the occupied space and is convenient for transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view stereoscopic structural schematic diagram of the present invention;

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the through hole and the cover plate cooperating with each other in the present invention;

[0017] Figure 3 It is a partial cross-sectional three-dimensional structural schematic diagram of the present invention;

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the connection strip and the limit strip cooperating with each other in the present invention;

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the limiting groove and the limiting member cooperating with each other in the present invention;

[0020] Figure 6 It is a schematic diagram of the three-dimensional structure of the stop plate and the fastener cooperating with each other in the present invention;

[0021] Figure 7 It is a schematic diagram of the three-dimensional structure of the connection plate and the limiting column cooperating with each other in the present invention;

[0022] Figure 8 It is a schematic diagram of the three-dimensional structure of the supporting block and the connecting hole cooperating with each other in the present invention;

[0023] Fig. 9 It is a schematic diagram of the three-dimensional structure of the bolt and the threaded hole matching each other in the present invention;

[0024] Fig.10 It is a schematic diagram of the three-dimensional structure of the present invention in a transport state;

[0025] Fig.11 For the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0026] Fig.12 For the present invention Figure 4 Schematic diagram of the enlarged structure at point B in the middle.

[0027] In the figure: 1. base; 2. lower rod body; 3. through hole; 4. cover plate; 5. connecting pipe; 6. upper rod body; 7. connecting groove; 8. right-angle steering gear; 81. connecting port; 9. internal threaded pipe; 10. double-sided threaded pipe; 11. threaded rod; 12. pressing block; 13. first spring sheet; 14. connecting strip; 15. gear; 16. limit strip; 17. limit groove; 18. limit piece; 181. slider; 182. top plate; 19. connecting sleeve; 20. connecting block; 21. limit sleeve; 22. connecting plate; 23. limit column; 24. second spring sheet; 25. limit plate; 26. fastener; 27. support block; 28. connecting hole; 29. ​​slot; 30. intelligent light source; 31. slide plate; 32. block; 33. fixing sleeve; 34. bolt; 35. threaded hole. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Embodiment 1

[0031] See also Figure 1-Figure 11 The present invention provides a technical solution: a 5G multifunctional smart lamp pole using basalt fiber composite materials, comprising a base 1, a lower rod body 2 is fixedly connected to the top of the base 1, a plurality of connecting tubes 5 which are mutually sleeved and axially slidable are arranged inside the lower rod body 2, an upper rod body 6 is slidably connected inside the connecting tube 5, and a lamp pole body is formed by cooperating with the plurality of connecting tubes 5 which are mutually sleeved and the lower rod body 2 through a lifting mechanism, a limiting mechanism for limiting the connecting tube 5 is arranged on the outer wall of the lamp pole body, and a mounting device is installed on the outer wall of the upper rod body 6.

[0032] When in use, first fix the base 1 to the specified position, then connect the external motor to the connection port 81, and then start the motor, and drive multiple groups of mutually socketed double-sided threaded tubes 10 to slide upward in sequence through the right-angle steering gear 8 and push the upper rod body 6 to slide out of the interior of the connecting tube 5, then install the mounting equipment to the surface of the upper rod body 6, and continue to start the motor, driving multiple groups of mutually socketed double-sided threaded tubes 10 to slide upward in sequence, thereby pushing multiple groups of mutually socketed connecting tubes 5 to slide out in sequence to form the lamp pole body, and then the multiple groups of connecting tubes 5 are limited by the limiting mechanism.

[0033] See also Figure 3 , Figure 4 , Figure 5 , Figure 1 and Fig.12 The lifting mechanism includes an internal threaded tube 9 located at the center position of the lower rod body 2 and multiple groups of double-sided threaded tubes 10 that are mutually sleeved and axially slidable inside the internal threaded tube 9. A threaded rod 11 that is adapted to the double-sided threaded tube 10 is provided on the inner wall of the upper rod body 6. A pressing block 12 and a first spring sheet 13 that is adapted to the pressing block 12 are rotatably connected on the outer walls of the internal threaded tube 9 and the threaded rod 11. A connecting strip 14 that is adapted to the pressing block 12 is provided on the outer wall of the internal threaded tube 9. A gear 15 that is adapted to the connecting strip 14 is provided on the outer wall of the internal threaded tube 9. A limiting strip 16 is meshed on the outer wall of one end of the gear 15 away from the connecting strip 14, and both ends of the limiting strip 16 are slidably connected to the inner wall of the internal threaded tube 9. A limiting groove 17 that is adapted to the limiting strip 16 is provided on the inner wall of the bottom end of the internal threaded tube 9.

[0034] When in use, connect the external motor to the connection port 81, then start the motor, drive the internal threaded tube 9 to rotate through the right-angle steering gear 8, and the engagement of the limit strip 16 and the limit groove 17 makes the internal threaded tube 9 drive the multiple groups of double-sided threaded tubes 10 to rotate synchronously during rotation, thereby pushing the threaded rod 11 to slide upward and lift the upper rod body 6. When the upper rod body 6 is fully lifted, the pressing block 12 on the surface of the threaded rod 11 is just on the same horizontal line as the connecting strip 14 on the surface of the double-sided threaded tube 10, so that the first spring sheet 13 pushes the pressing block 12 on the surface of the threaded rod 11. The block 12 rotates and presses the connecting bar 14 to slide downward. Through the meshing between the connecting bar 14, the gear 15 and the limit bar 16, the connecting bar 14 can push the limit bar 16 to slide upward when sliding downward, so that the bottom end of the limit bar 16 slides out of the inside of the limit groove 17, thereby releasing the limit between a group of double-sided threaded tubes 10 and the internal threaded tube 9, and limiting the internal threaded tube 9 and the threaded rod 11. The principle of the remaining groups of internal threaded tubes 9 is the same as above, so that the multiple groups of internal threaded tubes 9 push the multiple groups of connecting tubes 5 to slide upward and out of the lamp pole body in turn.

[0035] See also Figure 2 and Figure 5 As shown in the figure, the lifting mechanism also includes a through hole 3 opened on the outer wall of the bottom end of the lower rod body 2, a cover plate 4 adapted to the through hole 3 and a limit member 18 adapted to the limit groove 17, and the limit member 18 is composed of a slider 181 and a top plate 182. The top end of the base 1 is located at the center position inside the lower rod body 2 and is provided with a right-angle diverter 8 adapted to the internal threaded tube 9. The end of the right-angle diverter 8 facing the through hole 3 is provided with a connection port 81.

[0036] When the intelligent light source 30 needs to be replaced, the cover plate 4 is removed from the surface of the through hole 3, and then the external motor is connected to the connection port 81, and the limiter 18 is slid into the inside of the limiter groove 17, and the motor is started, and the inner threaded tube 9 is driven to rotate in the opposite direction through the right-angle steering gear 8, so that the outermost double-sided threaded tube 10 moves downward first and slides into the inside of the inner threaded tube 9, so that the limiter 18 lifts the connecting strip 14 to slide upward, and pushes the pressing block 12 to reset, and the connection strip 14, the gear 15 and the limiter strip 16 are connected. The engagement allows the connecting strip 14 to push the limiting strip 16 to slide downward when sliding upward, and to be re-engaged in the connecting groove 7. The remaining double-sided threaded tubes 10 and threaded rods 11 work in the same manner as above, pulling multiple sets of mutually socketed connecting tubes 5 to slide into the lower rod body 2 in sequence, thereby lowering the upper rod body 6 to a suitable height for convenient replacement of the intelligent light source 30. When the limiting member 18 needs to be removed, first pull the slider 181 out of the limiting groove 17 to allow the top plate 182 to fall, and then pull out the top plate 182.

[0037] See also Figure 7 and Figure 8 The limiting mechanism includes a connecting sleeve 19 and a limiting sleeve 21 adapted to the connection between multiple groups of connecting pipes 5. The limiting sleeve 21 is symmetrically provided with a fixing groove at one end close to the connecting sleeve 19. A connecting block 20 adapted to the fixing groove is provided on the side of the connecting sleeve 19 close to the limiting sleeve 21. A connecting plate 22 is rotatably connected inside the limiting sleeve 21. A limiting column 23 adapted to the connecting block 20 is provided at one end of the connecting plate 22 close to the connecting block 20. A second spring sheet 24 adapted to the connecting plate 22 is provided inside the limiting sleeve 21. A supporting block 27 is provided on one side of the connecting sleeve 19 and the limiting sleeve 21 close to the connecting pipe 5. A connecting hole 28 adapted to the supporting block 27 is provided on the top outer wall of the connecting pipe 5.

[0038] When in use, after multiple groups of connecting tubes 5 that are mutually socketed and axially slidable slide upward out of the lamp pole body, the connecting sleeve 19 and the limiting sleeve 21 are buckled at the connection between the two connected groups of connecting tubes 5, so that the supporting blocks 27 on the surfaces of the connecting sleeve 19 and the limiting sleeve 21 are inserted into the interior of the connecting hole 28, thereby supporting the connecting tube 5. At the same time, the connecting block 20 on the surface of the connecting sleeve 19 will slide into the interior of the fixed groove on the surface of the limiting sleeve 21, and push the limiting column 23 and the connecting plate 22 to rotate and squeeze the second spring sheet 24. When the connecting block 20 completely enters the interior of the limiting sleeve 21, the thrust of the second spring sheet 24 pushes the connecting plate 22 to rotate, so that the limiting column 23 engages with the connecting block 20, thereby connecting the limiting sleeve 21 to the connecting sleeve 19, and fixing the multiple groups of connecting tubes 5.

[0039] See also Figure 6The limiting mechanism also includes a limiting plate 25 buckled on the outer wall of the limiting sleeve 21 facing the connecting block 20 and a fastener 26 that penetrates the limiting plate 25 and the center of the connecting block 20 and squeezes the outer wall of the connecting pipe 5.

[0040] When in use, after the limiting column 23 engages the connecting block 20, the limiting plate 25 is engaged with the surface of the limiting sleeve 21, and then one end of the fastener 26 passes through the surface of the limiting plate 25 and the connecting block 20, and is threadedly connected to the limiting sleeve 21, and one end of the fastener 26 is squeezed against the surface of the connecting tube 5, thereby fixing the limiting sleeve 21 and the connecting sleeve 19 on the surface of the connecting tube 5; when the smart light source 30 needs to be replaced, first remove the fastener 26 and the limiting plate 25, and then the fluctuation limiting column 23 releases the limit on the connecting block 20, thereby removing the limiting sleeve 21 and the connecting sleeve 19 from the surface of the connecting tube 5.

[0041] See also Figure 1 and Fig. 9 The mounting device includes an intelligent light source 30 and a connecting groove 7 opened on the outer wall of the upper rod body 6. A slide plate 31 adapted to the connecting groove 7 is provided at one end of the intelligent light source 30 close to the upper rod body 6, and a block 32 is fixedly connected to the bottom end of the slide plate 31. A fixing sleeve 33 adapted to the upper rod body 6 is provided at one end of the intelligent light source 30 close to the upper rod body 6, and a bolt 34 passes through the outer wall of the fixing sleeve 33, and a threaded hole 35 adapted to the bolt 34 is provided on the top outer wall of the upper rod body 6.

[0042] When in use, first make the slide plate 31 slidingly connected with the connecting groove 7 on the surface of the upper rod body 6, and put the fixing sleeve 33 on the top of the upper rod body 6. When installing the limiting sleeve 21 and the connecting sleeve 19, the block 32 at the bottom end of the slide plate 31 is inserted into the inside of the slot 29, and then the bolt 34 passes through the surface of the fixing sleeve 33 and is threadedly connected with the threaded hole 35 at the top of the upper rod body 6, so as to fix the intelligent light source 30 on the top of the lamp pole body.

[0043] See also Figure 8 and Fig. 9 As shown in the figure, the upper rod body 6 and the outer walls of multiple groups of connecting pipes 5 that are mutually sleeved and axially slidable are provided with connecting grooves 7, and the limiting sleeve 21 is provided with a groove 29 adapted to the block 32 on one side close to the connecting pipe 5, and the connecting sleeve 19 and the limiting sleeve 21 are provided with a groove 29 adapted to the block 32 on one side close to the connecting pipe 5.

[0044] When in use, through the mutual cooperation of the slide plate 31, the connecting groove 7 and the card slot 29, the corresponding mounting equipment can be installed on the surface of the lamp pole body according to the situation, such as a display screen for displaying information or advertisements, a broadcasting speaker for publishing information or advertising voice, a camera device for shooting road conditions and a monitoring device for security monitoring, etc.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A 5G multifunctional smart lamp pole using basalt fiber composite material, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a lower rod body (2), a plurality of groups of mutually sleeved and axially slidable connecting pipes (5) are arranged inside the lower rod body (2), an upper rod body (6) is slidably connected inside the connecting pipe (5), and a lamp pole body is formed by cooperating with the plurality of mutually sleeved connecting pipes (5) and the lower rod body (2) through a lifting mechanism, a limiting mechanism is arranged on the outer wall of the lamp pole body, and a mounting device is installed on the outer wall of the upper rod body (6); The lifting mechanism comprises an internally threaded tube (9) located at the center of the lower rod body (2) and a plurality of groups of double-sided threaded tubes (10) which are sleeved together and axially slidable inside the internally threaded tube (9); a threaded rod (11) which is adapted to the double-sided threaded tube (10) is provided on the inner wall of the upper rod body (6); a pressing block (12) and a first spring sheet (13) which is adapted to the pressing block (12) are rotatably connected on the outer walls of the internally threaded tube (9) and the threaded rod (11); A connecting strip (14) adapted to the pressing block (12) is arranged on the outer wall of the tube (9), a gear (15) adapted to the connecting strip (14) is arranged on the outer wall of the internally threaded tube (9), a limit strip (16) is meshed on the outer wall of one end of the gear (15) away from the connecting strip (14), and both ends of the limit strip (16) are slidably connected to the inner wall of the internally threaded tube (9), and a limit groove (17) adapted to the limit strip (16) is arranged on the inner wall of the bottom end of the internally threaded tube (9); The lifting mechanism further comprises a through hole (3) formed on the outer wall of the bottom end of the lower rod body (2), a cover plate (4) adapted to the through hole (3), and a stopper (18) adapted to the stopper groove (17), wherein the stopper (18) is composed of a slider (181) and a top plate (182). A right-angle diverter (8) adapted to the internal threaded tube (9) is arranged at the top end of the base (1) at the center position inside the lower rod body (2), and a connection port (81) is arranged at one end of the right-angle diverter (8) facing the through hole (3).

2. According to claim 1, a 5G multifunctional smart lamp pole using basalt fiber composite material is characterized by: The limiting mechanism comprises a connecting sleeve (19) and a limiting sleeve (21) adapted to the connection between the plurality of connecting pipes (5); a fixing groove is symmetrically provided at one end of the limiting sleeve (21) close to the connecting sleeve (19); a connecting block (20) adapted to the fixing groove is provided at one side of the connecting sleeve (19) close to the limiting sleeve (21); a connecting plate (22) is rotatably connected inside the limiting sleeve (21); a limiting column (23) adapted to the connecting block (20) is provided at one end of the connecting plate (22) close to the connecting block (20); a second spring sheet (24) adapted to the connecting plate (22) is provided inside the limiting sleeve (21); a supporting block (27) is provided at one side of the connecting sleeve (19) and the limiting sleeve (21) close to the connecting pipe (5); and a connecting hole (28) adapted to the supporting block (27) is provided on the top outer wall of the connecting pipe (5).

3. According to claim 2, a 5G multifunctional smart lamp pole using basalt fiber composite material is characterized by: The limiting mechanism further comprises a limiting plate (25) buckled on the outer wall of the limiting sleeve (21) in a direction facing the connecting block (20), and a fastener (26) penetrating the center of the limiting plate (25) and the connecting block (20) and pressing the outer wall of the connecting pipe (5).

4. According to claim 2, a 5G multifunctional smart lamp pole using basalt fiber composite material is characterized by: The mounting device comprises an intelligent light source (30) and a connecting groove (7) formed on the outer wall of an upper rod body (6); a slide plate (31) adapted to the connecting groove (7) is arranged at one end of the intelligent light source (30) close to the upper rod body (6); a clamping block (32) is fixedly connected to the bottom end of the slide plate (31); a fixing sleeve (33) adapted to the upper rod body (6) is arranged at one end of the intelligent light source (30) close to the upper rod body (6); a bolt (34) penetrates through the outer wall of the fixing sleeve (33); and a threaded hole (35) adapted to the bolt (34) is arranged on the top outer wall of the upper rod body (6).

5. According to claim 4, a 5G multifunctional smart lamp pole using basalt fiber composite material is characterized in that: The upper rod body (6) and the outer walls of the plurality of mutually sleeved and axially slidable connecting tubes (5) are both provided with connecting grooves (7); the limiting sleeve (21) is provided with a groove (29) adapted to the block (32) on one side close to the connecting tube (5); and the connecting sleeve (19) and the limiting sleeve (21) are both provided with a groove (29) adapted to the block (32) on one side close to the connecting tube (5).

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