Ecological dredging system for pipeline

Abstract

The invention belongs to the technical field of dredging systems, and discloses a pipeline ecological dredging system which comprises an upper washing pipe, a connecting pipe, a lower pipe body, a liquid inlet unit, a liquid pumping unit and a positioning unit, the upper washing pipe is in running fit with the connecting pipe, the connecting pipe is in sliding fit with the lower pipe body, and the liquid inlet unit is in running fit with the upper washing pipe and is communicated with the upper washing pipe; a plurality of flushing holes are obliquely formed in the upper flushing pipe relative to the axis of the upper flushing pipe, an outer shell with a plurality of telescopic cutters is fixed to the upper flushing pipe and is in running fit with the connecting pipe, an inner cavity is formed among the upper flushing pipe, the connecting pipe and the outer shell, a power cavity is formed between the connecting pipe and the lower pipe body, and a reset spring is arranged in the power cavity. The power cavity communicates with the inner cavity through a guide pipe, and the inner cavity communicates with the multiple telescopic cutters. A baffle is fixed on the lower pipe body; according to the pipeline cleaning device, the interior and the inner wall of a pipeline are comprehensively washed through high-pressure water flow, foreign matter in the pipeline and the inner wall of the pipeline is comprehensively removed through the telescopic cutter, and the cleaning effect is excellent.

Description

Technical Field

[0001] The present invention belongs to the technical field of dredging systems, and specifically relates to a pipeline ecological dredging system. Background Art

[0002] In the pipeline network of a city, after long-term use, silt accumulates inside the pipeline, and some foreign objects also appear inside the pipeline. These are likely to cause pipeline blockages. When cleaning them, traditional pipeline ecological dredging systems mostly use high-pressure water jets to wash the sediment. For example, the high-pressure water jet method sprays water through a nozzle to wash the pipe wall, but its washing direction is fixed, resulting in a limited washing coverage area and it is difficult to remove hard sediments inside the pipeline. Summary of the Invention

[0003] In view of the above situation, to overcome the defects of the prior art, the present invention provides a pipeline ecological dredging system, which effectively solves the problem that traditional pipeline ecological dredging systems mostly use high-pressure water jets to wash the sediment, but their washing direction is fixed, resulting in a limited washing coverage area and it is difficult to remove hard sediments inside the pipeline.

[0004] To achieve the above object, the present invention provides the following technical solution: A pipeline ecological dredging system includes an upper flushing pipe, a connecting pipe, a lower pipe body, a liquid inlet unit, a liquid pumping unit, and a positioning unit. The upper flushing pipe is rotationally fitted with the connecting pipe, the connecting pipe is slidably fitted with the lower pipe body, and the liquid inlet unit is rotationally fitted with and communicated with the upper flushing pipe; a plurality of flushing holes are obliquely arranged on the upper flushing pipe relative to its axis, and an outer shell body with a plurality of telescopic cutters is fixed on the upper flushing pipe. The outer shell body is rotationally fitted with the connecting pipe. An inner cavity is formed between the upper flushing pipe, the connecting pipe, and the outer shell body. A power cavity is formed between the connecting pipe and the lower pipe body. A return spring is arranged in the power cavity. The power cavity is communicated with the inner cavity through a conduit, and the inner cavity is communicated with all the telescopic cutters; a baffle is fixed on the lower pipe body, and the baffle is located below the telescopic cutters;

[0005] The axis of the flushing hole is not in the same plane as the axis of the upper flushing pipe, and the orifice of the flushing hole faces from the inner side of the free end of the upper flushing pipe to the outer side of the other end of the upper flushing pipe.

[0006] Preferably, the baffle includes an inner ring plate and an outer ring plate. The outer ring plate is fixed on the lower pipe body through the inner ring plate. The inner ring plate is made of a hard material, and the outer ring plate is made of an elastic material.

[0007] Preferably, the liquid inlet unit includes a liquid inlet pipe and an external high-pressure pump. One end of the liquid inlet pipe sequentially passes through the lower pipe body and the connecting pipe, is rotationally fitted with and communicated with the upper flushing pipe, and the other end of the liquid inlet pipe is connected to the external high-pressure pump.

[0008] Preferably, the liquid extraction unit includes a liquid extraction pipe, a side housing, a return pipe, and an external liquid extraction pump. The liquid extraction pipe is fixed to the side housing. A transfer cavity is provided on the connecting pipe. The side housing is rotatably disposed in the transfer cavity. The transfer cavity is fixedly communicated with the return pipe. The return pipe sequentially passes through the connecting pipe and the lower pipe body and then is connected to the external liquid extraction pump.

[0009] Preferably, the telescopic cutter includes an inner rod body, an outer cutter, and a telescopic spring. An integral slider is connected to the inner rod body, and an inner through hole is provided. A sliding groove is provided inside the outer cutter. The slider is slidably engaged with the sliding groove. The telescopic spring surrounds the inner rod body and is located inside the sliding groove.

[0010] Preferably, the overall shape of the telescopic cutter is diamond-shaped. The longitudinal dimension between one end of the telescopic cutter close to the upper flushing pipe and the baffle is greater than the longitudinal dimension between the other end of the telescopic cutter far from the upper flushing pipe and the baffle.

[0011] Preferably, an arc surface is formed at the free end of the outer cutter. The outermost side line in the longitudinal direction on the arc surface away from the upper flushing pipe is inclined relative to the axis of the upper flushing pipe.

[0012] Preferably, a plurality of cutting grooves are arranged in a linear array on the arc surface, and the cutting grooves are inclined relative to the horizontal line on the arc surface.

[0013] Preferably, one end of the connecting pipe close to the upper flushing pipe is made of a hard material, the rest of the connecting pipe is made of a bendable material, both ends of the lower pipe body are made of a hard material, and the rest of the lower pipe body is made of a bendable material.

[0014] Preferably, the positioning unit includes a plurality of wheel mechanisms. Each wheel mechanism includes a spring-type telescopic rod and two positioning wheels. The spring-type telescopic rod is fixed to the lower pipe body, and both positioning wheels are rotatably disposed on the spring-type telescopic rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. During operation, through the cooperation of the upper flushing pipe, the connecting pipe, the telescopic cutter, etc., not only can the inside and inner wall of the pipeline be comprehensively flushed by high-pressure water flow, but also the foreign matters inside the pipeline and on the inner wall of the pipeline can be comprehensively removed by the telescopic cutter, and the cleaning effect is excellent.

[0017] 2. During operation, through the cooperation of the inner rod body, the outer cutter, etc., after the telescopic cutter extends, its end can gradually approach the outer edge of the baffle, so as to facilitate the crushing of harder foreign matters on the pipeline.

[0018] 3. During operation, through the cooperation of the provided arc surface and cutting groove, etc., the effective contact area between the outer tool and the harder foreign objects inside the pipeline is reduced by the inclined arc surface. In conjunction with the slow outward movement of the outer tool, it enables the outer tool to only crush a relatively small part of the foreign objects each time, playing a protective role for the outer tool; the inclined cutting groove can ensure the effective cutting force of the outer tool on the harder foreign objects, further improving the cutting effect of the outer tool.

[0019] 4. During operation, since the connecting pipe and the lower pipe body are made of bendable materials, they can adapt to the bent parts of the pipeline and ensure continuous progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0021] In the drawings:

[0022] Figure 1 is a schematic structural diagram of a pipeline ecological dredging system of the present invention;

[0023] Figure 2 is of the present invention Figure 1 partial cross-sectional structural schematic diagram;

[0024] Figure 3 is of the present invention Figure 1 one of the longitudinal structural schematic diagrams;

[0025] Figure 4 is of the present invention Figure 1 the other longitudinal structural schematic diagram;

[0026] Figure 5 is the overall structural schematic diagram of the telescopic tool of the present invention;

[0027] Figure 6 is the cross-sectional structural schematic diagram of the telescopic tool of the present invention;

[0028] Figure 7 is of the present invention Figure 4 enlarged structural schematic diagram at A;

[0029] Figure 8 is of the present invention Figure 3 enlarged structural schematic diagram at B;

[0030] Figure 9 is of the present invention Figure 8 enlarged structural schematic diagram at C.

[0031] In the figure: 1. upper flush pipe; 2. connecting pipe; 3. lower pipe body; 4. flushing hole; 5. outer shell body; 6. inner cavity body; 7. power cavity; 8. reset spring; 9. conduit; 10. baffle; 11. inner ring plate; 12. outer ring plate; 13. liquid inlet pipe; 14. liquid extraction pipe; 15. side shell; 16. return pipe; 17. transfer cavity; 18. inner rod body; 19. outer cutter; 20. telescopic spring; 21. slider; 22. inner through hole; 23. chute; 24. arc surface; 25. cutting groove; 26. spring-type telescopic rod; 27. positioning wheel. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0033] In the urban pipe network, after long-term use, silt will accumulate inside the pipes, and some foreign objects will also appear inside the pipes, which are likely to cause pipe blockages. When cleaning them, traditional pipe ecological dredging systems mostly use high-pressure water jets to flush the silt. For example, the high-pressure water jet method sprays water through a nozzle to flush the pipe wall, but its flushing direction is fixed, resulting in a limited flushing coverage area and it is difficult to remove hard deposits inside the pipe. Therefore, the above technical problems need to be solved.

[0034] Provided by Figures 1-9 The present invention relates to a pipe ecological dredging system, including an upper flush pipe 1, a connecting pipe 2, a lower pipe body 3, a liquid inlet unit, a liquid extraction unit and a positioning unit. The upper flush pipe 1 is rotationally matched with the connecting pipe 2, the connecting pipe 2 is slidably matched with the lower pipe body 3, and the liquid inlet unit is rotationally matched with and communicated with the upper flush pipe 1; a plurality of flushing holes 4 are obliquely arranged on the upper flush pipe 1 relative to its axis, and an outer shell body 5 with a plurality of telescopic cutters is fixed on the upper flush pipe 1. The outer shell body 5 is rotationally matched with the connecting pipe 2. An inner cavity body 6 is formed between the upper flush pipe 1, the connecting pipe 2 and the outer shell body 5. A power cavity 7 is formed between the connecting pipe 2 and the lower pipe body 3. A reset spring 8 is arranged in the power cavity 7. The power cavity 7 is communicated with the inner cavity body 6 through a conduit 9, and the inner cavity body 6 is communicated with all the telescopic cutters; a baffle 10 is fixed on the lower pipe body 3, and the baffle 10 is located below the telescopic cutter;

[0035] The axis of the flushing hole 4 is not in the same plane as the axis of the upper flush pipe 1, and the orifice of the flushing hole 4 faces from the inner side of the free end of the upper flush pipe 1 to the outer side of the other end of the upper flush pipe 1.

[0036] With this design, during use, it is placed inside the pipeline. Then, through the cooperation of the positioning unit and the baffle 10, it is basically located in the central area of the pipeline. Subsequently, high-pressure water flow is conveyed into the interior of the upper flushing pipe 1 through the liquid inlet unit. Then, it sprays out through the flushing holes 4 on the upper flushing pipe 1, and the interior and inner wall of the pipeline are flushed by the high-pressure water flow. And under the action of the special design of the high-pressure water flow and the flushing holes 4, the upper flushing pipe 1 advances and rotates inside the pipeline. At the same time, the upper flushing pipe 1 drives the lower pipe body 3 to advance through the connecting pipe 2, and the lower pipe body 3 drives the baffle 10 on it to advance. The baffle 10 scrapes off foreign matters on the inner wall of the pipeline, and the hard substances are crushed by the telescopic cutter on the upper flushing pipe 1. At the same time, due to the obstruction of the baffle 10, the water flow accumulates on one side of the baffle 10. At this time, the liquid pumping unit can be used to pump back the sewage with silt generated by flushing, and the pumped sewage can be discharged to a suitable position outside.

[0037] During this period, when the baffle 10 encounters a hard foreign matter on the inner wall of the pipeline and cannot scrape it off, the baffle 10 will stop moving, while the upper flushing pipe 1 still continues to advance. Under the pulling of the upper flushing pipe 1, the connecting pipe 2 squeezes both the reset spring 8 and the liquid in the power cavity 7, so that the liquid in the power cavity 7 enters the interior of the inner cavity 6 through the conduit 9, and then enters the interior of each telescopic cutter, causing the telescopic cutter to move closer to the inner wall of the pipeline from its original position. After reaching the maximum position, the hard foreign matter on the inner wall of the pipeline can be crushed by the telescopic cutter, thus ensuring the continuous advancement of the baffle 10. After the foreign matter is removed, under the action of the reset spring 8 and the telescopic cutter itself, the telescopic cutter moves to the original position, and at the same time, the liquid also flows reversely and returns to the original position.

[0038] Specifically, the baffle 10 includes an inner ring plate 11 and an outer ring plate 12. The outer ring plate 12 is fixed on the lower pipe body 3 through the inner ring plate 11. The inner ring plate 11 is made of a hard material, and the outer ring plate 12 is made of an elastic material. With this design, the outer side of the baffle 10 has the ability to deform. In this way, even if there are small foreign matters on the inner wall of the pipeline or small fragments generated by flushing, the baffle 10 can still continue to pass through, avoiding excessive damage to the pipeline.

[0039] Specifically, the liquid inlet unit includes a liquid inlet pipe 13 and an external high-pressure pump. One end of the liquid inlet pipe 13 passes through the lower pipe body 3 and the connecting pipe 2 in sequence, and then is rotationally matched and communicated with the upper flushing pipe 1. The other end of the liquid inlet pipe 13 is connected to the external high-pressure pump. With this design, during use, the water flow is conveyed into the interior of the upper flushing pipe 1 through the liquid inlet pipe 13 by the external high-pressure pump, and since the liquid inlet pipe 13 is rotationally matched with the upper flushing pipe 1, it will not affect the normal use of the upper flushing pipe 1.

[0040] Specifically, the liquid extraction unit includes a liquid extraction pipe 14, a side housing 15, a return pipe 16, and an external liquid extraction pump. The liquid extraction pipe 14 is fixed to the side housing 15. There is a transfer chamber 17 on the connecting pipe 2. The side housing 15 is rotatably arranged in the transfer chamber 17. The transfer chamber 17 is fixedly communicated with the return pipe 16. The return pipe 16 sequentially passes through the connecting pipe 2 and the lower pipe body 3 and then is connected to the external liquid extraction pump. With such a design, during use, the external liquid extraction pump generates a suction force, and the sewage is extracted through the return pipe 16, the transfer chamber 17, and the liquid extraction pipe 14. And due to the rotational arrangement of the side housing 15, under the action of the self-gravity of the liquid extraction pipe 14, the nozzle of the liquid extraction pipe 14 can always be placed at the bottom of the pipeline to ensure the normal progress of liquid extraction.

[0041] It should be noted that a filtering device can be provided to filter the extracted sewage, and then the filtered sewage can be used as the water source for the external high-pressure pump to save water resources.

[0042] Specifically, the telescopic cutter includes an inner rod body 18, an outer cutter 19, and a telescopic spring 20. An integral slider 21 is connected to the inner rod body 18, and an inner through hole 22 is provided. A chute 23 is provided inside the outer cutter 19. The slider 21 is slidably matched with the chute 23. The telescopic spring 20 is wound around the inner rod body 18 and is located inside the chute 23.

[0043] With such a design, during use, when the baffle 10 is blocked, the liquid in the power chamber 7 enters the interior of the inner cavity 6 through the conduit 9, and then enters the space between the free end of the outer cutter 19 and the slider 21 through the inner through hole 22. Thus, under the action of the liquid pressure, the outer cutter 19 elongates after overcoming the elastic force of the telescopic spring 20, so as to facilitate the crushing operation of harder foreign objects by the outer cutter 19. It should be noted that the outer cutter 19 can only move along the axis of the inner rod body 18 and cannot rotate.

[0044] It should be noted that since the space of the power chamber 7 and the space between the free end of the outer cutter 19 and the slider 21 are both large, and the cross-sectional area of the conduit 9 is small, the relative movement between the outer cutter 19 and the inner rod body 18 will be relatively slow. As a result, the outer cutter 19 moves outward at a relatively slow speed, avoiding excessive collision between the outer cutter 19 and harder foreign objects. And the telescopic spring 20 can make the outer cutter 19 return to the original position after the crushing by the outer cutter 19. When the liquid in the power chamber 7 is replaced by gas, during cutting, the telescopic spring 20 can play a buffering role to avoid damage to the outer cutter 19 due to the excessive firmness of foreign objects.

[0045] Considering that when the baffle 10 is blocked, the upper punching pipe 1 will continue to move upward, causing the telescopic cutter to move away from the baffle 10, which makes the telescopic cutter unable to effectively approach the harder foreign objects in the direction of the baffle 10 for crushing. To solve this problem, the overall shape of the telescopic cutter is diamond-shaped, and the longitudinal dimension between one end of the telescopic cutter close to the upper punching pipe 1 and the baffle 10 is greater than the longitudinal dimension between the other end of the telescopic cutter far from the upper punching pipe 1 and the baffle 10. With this design, after the telescopic cutter extends, its end can gradually approach the outer edge of the baffle 10, so as to facilitate the crushing of the harder foreign objects on the pipeline.

[0046] Further, an arc surface 24 is formed at the free end of the outer cutter 19, and the outermost side line in the longitudinal direction on the arc surface 24 away from the upper punching pipe 1 is inclined relative to the axis of the upper punching pipe 1. With this design, the effective contact area between the outer cutter 19 and the harder foreign objects inside the pipeline can be reduced through the inclined arc surface 24. Combined with the slow outward movement of the outer cutter 19, the outer cutter 19 can only crush a relatively small part of the foreign objects each time, playing a protective role for the outer cutter 19.

[0047] Further, a plurality of cutting grooves 25 arranged in a linear array are formed on the arc surface 24, and the cutting grooves 25 are inclined relative to the horizontal line on the arc surface 24. With this design, during cutting, the effective cutting force of the outer cutter 19 on the harder foreign objects can be ensured through the inclined cutting grooves 25, further improving the cutting effect of the outer cutter 19.

[0048] Considering that the inside of the pipeline is sometimes curved, in order to adapt to the curved pipeline, one end of the connecting pipe 2 close to the upper punching pipe 1 is made of a hard material, the rest of the connecting pipe 2 is made of a bendable material, and both ends of the lower pipe body 3 are made of a hard material, and the rest of the lower pipe body 3 is made of a bendable material. With this design, a bendable material such as silicone or rubber can be used in the area between the upper punching pipe 1 and the lower pipe body 3, thereby expanding the scope of use.

[0049] Specifically, the positioning unit includes a plurality of wheel body mechanisms. Each wheel body mechanism includes a spring-type telescopic rod 26 and two positioning wheels 27. The spring-type telescopic rod 26 is fixed on the lower pipe body 3, and the two positioning wheels 27 are both rotatably arranged on the spring-type telescopic rod 26. With this design, the whole can be basically located in the middle of the pipeline when entering the pipeline through a plurality of wheel body mechanisms, thus ensuring the stability of the whole; the setting of the spring-type telescopic rod 26 can adapt to different pipeline radii; the spring-type telescopic rod 26 can only move along its own axis direction and cannot rotate.

[0050] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0051] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipeline ecological dredging system, comprising an upward flushing pipe (1), a connecting pipe (2), a lower pipe body (3), a liquid inlet unit, a liquid pumping unit and a positioning unit. The upward flushing pipe (1) is rotationally matched with the connecting pipe (2), the connecting pipe (2) is slidably matched with the lower pipe body (3), and the liquid inlet unit is rotationally matched with and communicated with the upward flushing pipe (1); characterized in that, A plurality of flushing holes (4) are obliquely arranged on the upper flushing pipe (1) relative to its axis. A housing (5) with a plurality of telescopic cutters is fixed on the upper flushing pipe (1). The housing (5) is rotationally matched with the connecting pipe (2). An inner cavity (6) is formed among the upper flushing pipe (1), the connecting pipe (2) and the housing (5). A power cavity (7) is formed between the connecting pipe (2) and the lower pipe body (3). A return spring (8) is arranged in the power cavity (7). The power cavity (7) is communicated with the inner cavity (6) through a conduit (9), and the inner cavity (6) is communicated with all the telescopic cutters; A baffle (10) is fixed on the lower pipe body (3), and the baffle (10) is located below the telescopic cutter; The axis of the flushing hole (4) is not in the same plane as the axis of the upper flushing pipe (1), and the orifice of the flushing hole (4) faces from the inner side of the free end of the upper flushing pipe (1) to the outer side of the other end of the upper flushing pipe (1).

2. The pipeline ecological dredging system according to claim 1, characterized in that, The baffle (10) includes an inner ring plate (11) and an outer ring plate (12). The outer ring plate (12) is fixed on the lower pipe body (3) through the inner ring plate (11). The inner ring plate (11) is made of a hard material, and the outer ring plate (12) is made of an elastic material.

3. The pipeline ecological dredging system according to claim 1, characterized in that, The liquid inlet unit includes a liquid inlet pipe (13) and an external high-pressure pump. One end of the liquid inlet pipe (13) sequentially passes through the lower pipe body (3) and the connecting pipe (2), then is rotationally matched with and communicated with the upper flushing pipe (1), and the other end of the liquid inlet pipe (13) is connected with the external high-pressure pump.

4. A pipeline ecological dredging system according to claim 1, characterized in that, The liquid extraction unit includes a liquid extraction pipe (14), a side housing (15), a return pipe (16) and an external liquid extraction pump. The liquid extraction pipe (14) is fixed on the side housing (15). A transfer cavity (17) is arranged on the connecting pipe (2). The side housing (15) is rotatably arranged in the transfer cavity (17). The transfer cavity (17) is fixedly communicated with the return pipe (16). The return pipe (16) sequentially passes through the connecting pipe (2) and the lower pipe body (3) and then is connected with the external liquid extraction pump.

5. The pipeline ecological dredging system according to claim 1, characterized in that, The telescopic cutter includes an inner rod body (18), an outer cutter (19) and a telescopic spring (20). A slider (21) is integrally connected to the inner rod body (18) and an inner through hole (22) is formed. A sliding groove (23) is formed in the outer cutter (19). The slider (21) is slidably matched with the sliding groove (23). The telescopic spring (20) is wound around the inner rod body (18) and is located in the sliding groove (23).

6. The pipeline ecological dredging system according to claim 5, characterized in that, The overall shape of the telescopic cutter is diamond-shaped. The longitudinal dimension between the end of the telescopic cutter close to the upper flushing pipe (1) and the baffle (10) is greater than the longitudinal dimension between the end of the telescopic cutter far from the upper flushing pipe (1) and the baffle (10).

7. A pipeline ecological dredging system according to claim 5, characterized in that, An arc surface (24) is formed at the free end of the outer cutter (19). The outermost side line in the longitudinal direction away from the upper flushing pipe (1) on the arc surface (24) is obliquely arranged relative to the axis of the upper flushing pipe (1).

8. The pipeline ecological dredging system according to claim 7, characterized in that, A plurality of cutting grooves (25) arranged in a linear array are formed on the arc surface (24), and the cutting grooves (25) are obliquely arranged relative to the horizontal line on the arc surface (24).

9. A pipeline ecological dredging system according to claim 1, characterized in that, One end of the connecting pipe (2) close to the upper punching pipe (1) is made of a rigid material, and the rest of the connecting pipe (2) is made of a bendable material. Both ends of the lower pipe body (3) are made of a rigid material, and the rest of the lower pipe body (3) is made of a bendable material.

10. The pipeline ecological dredging system according to claim 1, characterized in that, The positioning unit includes a plurality of wheel body mechanisms. The wheel body mechanism includes a spring-type telescopic rod (26) and two positioning wheels (27). The spring-type telescopic rod (26) is fixed on the lower pipe body (3), and the two positioning wheels (27) are both rotatably arranged on the spring-type telescopic rod (26).

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