CN108799693B

CN108799693B - Pipeline robot

Info

Publication number: CN108799693B
Application number: CN201810775219.7A
Authority: CN
Inventors: 丁宁; 元小强; 张爱东; 张涛; 郑振粮; 周智慧; 高岩
Original assignee: Chinese University of Hong Kong Shenzhen
Current assignee: Chinese University of Hong Kong Shenzhen
Priority date: 2018-07-16
Filing date: 2018-07-16
Publication date: 2023-09-01
Anticipated expiration: 2038-07-16
Also published as: CN108799693A

Abstract

The invention belongs to the technical field of robots, and particularly relates to a pipeline robot, which comprises: two drive modules, two air bags, air pump subassembly and two piece at least flexible axle. At least two flexible shafts are arranged between the two driving modules, two ends of each flexible shaft are respectively arranged in the corresponding driving modules, and the driving modules can move along the axial direction of the flexible shafts. The air bags are in two states of inflation and deflation, and when the two air bags are in the inflation state at the same time, the pipeline robot can be fixed in the pipeline; when the two air bags are in a deflation state at the same time, the pipeline robot can move in the pipeline through the driving assembly; the two air bags are alternately inflated and deflated, and the pipeline robot can peristaltic in the pipeline in cooperation with pumping of the flexible shaft in the wire feeding assembly. The state of the air bag is changed, the state and the movement mode of the pipeline robot can be changed, and the pipeline robot can be better adapted to the complex environment in the pipeline.

Description

Pipeline robot

Technical Field

The invention belongs to the technical field of robots, and particularly relates to a pipeline robot.

Background

The pipeline is taken as an indispensable part in modern life, and is inevitably damaged due to long-term environmental corrosion, external force action and the like. In the use process of the pipeline, various problems such as pipeline faults, blockage, damage and the like can be generated, and serious accidents can be generated if the pipeline is not detected and maintained in time. The traditional response methods such as manual detection, random sampling, periodic replacement and the like have the defects of large engineering quantity, high cost, high risk coefficient and the like. In order to ensure the use safety of the pipeline, timing detection and maintenance are important, but the pipeline is mostly buried underground and is difficult to detect manually.

The maintenance requirements of pipes and vessels in severe environments such as oil, gas, nuclear industry, etc. in the last 70 th century stimulated the research of pipe robots, which were developed in various forms in succession in the united states, japan, and european countries such as france, germany. Research work of a large number of pipeline crawling detection robots is started by some scientific research institutions and institutions in China, and some commercialized applications are realized in large-diameter long and straight pipelines such as oil gas, municipal administration and the like at present. However, most of the existing pipeline robots move in the pipeline through wheels, the moving mode cannot adapt to complex environments in the pipeline, and when the pipeline robots need to be positioned, the problems of slipping and inaccurate positioning are easy to occur due to small contact area between the wheels and the inner wall of the pipeline.

Disclosure of Invention

The invention aims to solve the technical problems that the traditional pipeline robot moves in a pipeline through wheels, cannot adapt to complex environments in the pipeline, and is easy to slip and inaccurate in positioning.

In order to solve the technical problem, the present invention is realized by a pipeline robot, which is characterized by comprising: two driving modules and at least two flexible shafts;

the two ends of the flexible shafts are respectively arranged in the corresponding driving modules;

the driving module comprises a driving assembly, a wire feeding assembly and a fixed seat, wherein the wire feeding assembly and the driving assembly are both arranged on the fixed seat, the wire feeding assemblies are in one-to-one correspondence with the flexible shafts, the end parts of the flexible shafts penetrate through the corresponding wire feeding assemblies, the wire feeding assemblies penetrated by the same flexible shaft are pumped along the axis of the flexible shaft, and the driving assembly is used for moving in a pipeline;

the pipeline robot further comprises an air pump assembly and two air bags, the two air bags are respectively sleeved on the two fixing seats, the two air bags are connected with the air pump assembly, and when the air bags are inflated, the outer parts of the air bags can be propped against the inner wall of the pipeline.

Further, the wire feeding assembly comprises a bench, a first motor, a driving wheel and a first driven wheel;

the first motor is fixed on the rack, the driving wheel is connected with an output shaft of the first motor, and the first driven wheel is rotatably arranged on the rack;

the flexible shaft is inserted between the driving wheel and the first driven wheel, and the driving wheel rotates to pump the flexible shaft along the axial direction of the flexible shaft.

Further, the wire feeding assembly further comprises an adjusting seat and a second driven wheel;

the first end of the adjusting seat is rotatably arranged on the bench, the second end of the adjusting seat is elastically connected with the bench, the first driven wheel is rotatably arranged on the adjusting seat, and the second driven wheel is rotatably arranged on the bench;

the flexible shaft is inserted among the driving wheel, the first driven wheel and the second driven wheel, the driving wheel and the second driven wheel are positioned on the same side of the flexible shaft, and the first driven wheel is positioned between the driving wheel and the second driven wheel.

Further, the wire feeding assembly further comprises an adjusting nut, a T-shaped shaft and a spring;

the second end of the adjusting seat is provided with a through hole, the big end of the T-shaped shaft is connected with the rack, the small end of the T-shaped shaft penetrates through the through hole and then is sleeved with the spring, and the adjusting nut is arranged at the small end of the T-shaped shaft and abuts against the spring.

Further, the pipeline robot further comprises at least one shaping plate;

the periphery of the shaping plate is provided with first through grooves, and each flexible shaft penetrates through the first through grooves in a one-to-one correspondence manner.

Further, the pipeline robot further comprises a limiting rope;

the center of the shaping plate is provided with a second through groove, the limiting rope penetrates through the second through groove of the shaping plate and is knotted at the corresponding second through groove of the shaping plate, and two ends of the limiting rope are respectively connected to corresponding fixing seats.

Further, the driving assembly comprises a speed reducing motor, a driving assembly rack, a rotating shaft and wheels;

the traveling assembly rack is arranged on the fixed seat, the gear motor is fixed on the traveling assembly rack, and the wheels are connected to an output shaft of the gear motor through the rotating shaft.

Further, the driving assembly comprises a speed reducing motor, a driving assembly rack, two hexagonal rotating shafts and two wheels;

the speed reducing motor is fixed on the travelling assembly rack, one ends of the two hexagonal rotating shafts are connected with the speed reducing motor, the other ends are output ends, and the two wheels are correspondingly arranged on the output ends of the hexagonal rotating shafts one by one.

Further, the driving module further comprises a tensioning assembly, the tensioning assembly comprises a supporting rod and a tensioning driving mechanism, and the tensioning driving mechanism is arranged on the fixing seat; the first end of the supporting rod is connected with the running component, the second end of the supporting rod is connected with the tensioning driving mechanism, and the tensioning driving mechanism drives the running component to be abutted to the inner wall of the pipeline through the supporting rod.

Further, the tensioning driving mechanism comprises a second motor, a screw rod and a nut, wherein the second motor is fixed on the fixed seat, the second motor drives the screw rod to operate, the nut is in threaded connection with the screw rod, and the second end of the supporting rod is connected with the nut; or alternatively, the process may be performed,

the tensioning driving mechanism comprises a spiral spring, a guide post and a moving part, wherein the guide post is fixed on the fixed seat, the guide post is sleeved with the spiral spring, one end of the spiral spring is fixedly connected with the fixed seat, the other end of the spiral spring is fixedly connected with the moving part, the spiral spring provides tension close to the fixed seat for the moving part when the spiral spring is stretched by the moving part, or provides thrust far away from the fixed seat for the moving part when the spiral spring is compressed by the moving part.

Compared with the prior art, the invention has the beneficial effects that: the pipe robot of the present invention includes: two drive modules, two air bags, air pump subassembly and two piece at least flexible axle. At least two flexible shafts are arranged between the two driving modules, two ends of each flexible shaft are respectively arranged in the corresponding driving modules, and the driving modules can move along the axial direction of the flexible shafts. The air bags are in two states of inflation and deflation, and when the two air bags are in the inflation state at the same time, the pipeline robot can be fixed in the pipeline; when the two air bags are in a deflation state at the same time, the pipeline robot can move in the pipeline through the driving assembly; the two air bags are alternately inflated and deflated, and the pipeline robot can peristaltic in the pipeline in cooperation with pumping of the flexible shaft in the wire feeding assembly. The state of the air bag is changed, the state and the movement mode of the pipeline robot can be changed, and the pipeline robot can be better adapted to the complex environment in the pipeline.

Drawings

FIG. 1 is a schematic structural view of a pipe robot according to an embodiment of the present invention;

FIG. 2 is an exploded view of the structure of FIG. 1;

FIG. 3 is a schematic diagram of the driving module in FIG. 2;

FIG. 4 is an exploded view of FIG. 3;

FIG. 5 is a schematic view of the wire feed assembly of FIG. 4;

FIG. 6 is a cross-sectional view of the flexible shaft inserted into the wire feed assembly;

FIG. 7 is an exploded view of FIG. 5;

FIG. 8 is an exploded view of the travel module of FIG. 4;

FIG. 9 is a schematic view of the setting plate of FIG. 2;

FIG. 10 is a schematic view of the tensioning assembly of FIG. 4;

FIG. 11 is a schematic view of another embodiment of the tensioning assembly of FIG. 4.

In the drawings, each reference numeral denotes: 1. a driving module; 11. a travel assembly; 111. a speed reducing motor; 112. a traveling assembly rack; 113. a hexagonal rotating shaft; 114. a wheel; 12. a wire feeding assembly; 121. a stand; 122. an adjusting seat; 123. a first motor; 124. a driving wheel; 125. a first driven wheel; 126. a second driven wheel; 127. an adjusting nut; 128. a T-shaped shaft; 129. a spring; 13. a fixing seat; 14. a tensioning assembly; 141. a support rod; 142. a second motor; 143. a screw; 144. a nut; 145. a coil spring; 146. a guide post; 147. a moving member; 2. a flexible shaft; 3. shaping plates; 31. a first through groove; 32. a second through groove; 4. a limit rope; 5. an air bag.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1-4, a preferred embodiment of a pipe robot according to the present invention is provided, comprising: two drive modules 1 and at least two flexible shafts 2. At least two flexible shafts 2 are arranged between the two driving modules 1, and two ends of the at least two flexible shafts 2 are respectively arranged in the corresponding driving modules 1. The driving module 1 comprises a driving assembly 11, a wire feeding assembly 12 and a fixing seat 13, the wire feeding assembly 12 and the driving assembly 11 are both installed on the fixing seat 13, the wire feeding assemblies are in one-to-one correspondence with the flexible shafts, the end parts of the flexible shafts 2 penetrate through the corresponding wire feeding assemblies 12, the wire feeding assemblies 12 penetrated by the same flexible shaft 2 are pumped along the axis of the flexible shaft 2, and the driving assembly 11 is used for moving in a pipeline.

The pipeline robot further comprises an air pump assembly and two air bags 5, the two air bags 5 are respectively sleeved on the two fixing seats 13, the two air bags 5 are connected with the air pump assembly, and when the air bags 5 are inflated with air, the outer parts of the air bags 5 can be propped against the inner wall of the pipeline. The outer wall of the balloon 5 is made of a material having a strong friction force.

The air bags 5 are in two states of inflation and deflation, when the two air bags 5 are in the deflation state at the same time, wheels of the running assemblies 11 in the two driving modules 1 are in contact with the inner wall of the pipeline, and the running assemblies 11 drive the pipeline robot to move in the pipeline; the two air bags 5 are in an inflated state at the same time, when the two air bags 5 are full of air, wheels of the running assembly 11 in the two driving modules 1 are separated from the inner wall of the pipeline, and at the moment, the pipeline robot can be fixed in the pipeline for detection, detection and other operations due to the strong friction force of the outer wall of the air bags 5; the two air bags 5 are alternately inflated and deflated, and the pipeline robot can peristaltic in the pipeline in cooperation with the pumping of the flexible shaft in the wire feeding assembly 12, and the peristaltic mode is mostly used when the pipeline robot climbs a vertical pipeline. The method comprises the following steps that an air bag 5 at the head part of the pipeline robot is inflated, an air bag 5 at the tail part is deflated, at the moment, the head part of the pipeline robot is fixed in a pipeline, the tail part driving module 1 is enabled to move towards the direction close to the head part driving module 1 through the pumping of the flexible shaft 2 in the wire feeding assembly 12, after the tail part driving module 1 moves to a certain position, the air bag 5 at the tail part is inflated, the air bag 5 at the head part is deflated, at the moment, the tail part of the pipeline robot is fixed in the pipeline, and the head part driving module 1 is enabled to move towards the direction far away from the tail part driving module 1 through the pumping of the flexible shaft 2 in the wire feeding assembly 12. The pipeline robot can climb in the vertical pipeline by circulating in the way, and can adapt to the complex environment in the pipeline better.

In addition, when the pipeline robot encounters a T-shaped curve and needs to turn to one side, the wire feeding assembly in the driving module close to the curve starts to pump the side flexible shaft, so that the driving module close to the curve moves along the side flexible shaft towards the other driving module, and at the moment, the length of the flexible shaft between the two driving modules at the side is smaller than that of the flexible shaft between the two driving modules at the other side, so that the head of the pipeline robot deflects, and the pipeline robot can smoothly pass through the curve. Because the turning angle of the pipeline robot is determined by the length of each flexible shaft between the two driving modules, the turning angle of the pipeline robot can be adjusted according to the needs so as to adapt to various complex curves in the pipeline, the problem that the existing pipeline robot cannot turn when encountering the complex curves in the pipeline is solved, and the performance of products is improved.

Referring to fig. 5-7, in particular, the wire feed assembly 12 includes a gantry 121, an adjustment block 122, a first motor 123, a drive wheel 124, a first driven wheel 125, a second driven wheel 126, an adjustment nut 127, a T-shaped shaft 128, and a spring 129.

The first motor 123 is fixed on the stand 121, the driving wheel 124 is connected with an output shaft of the first motor 123, a first end of the adjusting seat 122 is rotatably mounted on the stand 121, and a second end of the adjusting seat 122 is elastically connected with the stand 121. The second end of the adjusting seat 122 is provided with a through hole, the big end of the T-shaped shaft 128 is connected with the rack 121, the small end of the T-shaped shaft 128 passes through the through hole and then the spring 129 is sleeved on the T-shaped shaft 128, and the adjusting nut 127 is mounted on the small end of the T-shaped shaft 128 and presses against the spring 129. The first driven wheel is rotatably mounted on the adjustment seat 122, and the second driven wheel 126 is rotatably mounted on the stand 121. The flexible shaft 2 is interposed between the driving wheel 124, the first driven wheel 125 and the second driven wheel 126, and the driving wheel and the second driven wheel are located on the same side of the flexible shaft, and the first driven wheel is located between the driving wheel and the second driven wheel. The drive wheel 124 rotates to draw the wire feed assembly 12 along the axial direction of the flexible shaft 2.

Referring to fig. 1, 2, 9, further, the pipe robot further comprises at least one sizing plate 3. The periphery of the shaping plate 3 is provided with a first through groove 31, and each flexible shaft 2 passes through the first through groove 31 in a one-to-one correspondence. Due to the fact that the rigidity of the flexible shaft 2 is insufficient, the pipeline robot is easy to deform in the moving process, the pipeline robot deviates from the preset direction, and the shaping plate 3 is used, so that the pipeline robot is not easy to deform in the moving process, and the pipeline robot is prevented from deviating from the preset direction.

Referring to fig. 1, 2 and 9, the pipe robot further comprises a limit rope 4. The center of the shaping plate 3 is provided with a second through groove 32, the limiting rope 4 passes through the second through groove 32 of the shaping plate 3 and is knotted at the corresponding second through groove 32 of the shaping plate 3, and two ends of the limiting rope 4 are respectively connected to corresponding fixing seats 13. The limiting rope 4 plays a limiting role on the shaping plate 3, so that the shaping effect of the shaping plate 3 on the flexible shaft is reduced after the plurality of shaping plates 3 are stacked together in the motion process of the pipeline robot.

Referring to fig. 8, specifically, the traveling assembly 11 includes a gear motor 111, a traveling assembly stage 112, two hexagonal shafts 113, and two wheels 114. The gear motor 111 is fixed on the traveling assembly rack 112, one ends of two hexagonal rotating shafts 113 are connected with the gear motor 111, the other ends are output ends, and two wheels 114 are installed on the output ends of the hexagonal rotating shafts 113 in a one-to-one correspondence.

Further, the driving module 1 further comprises a tensioning assembly 14, the tensioning assembly 14 comprises a supporting rod 141 and a tensioning driving mechanism, and the tensioning driving mechanism is installed on the fixing seat 13; the first end of the supporting rod 141 is connected with the running component 11, the second end of the supporting rod 141 is connected with the tensioning driving mechanism, and the tensioning driving mechanism drives the running component 11 to be abutted to the inner wall of the pipeline through the supporting rod 141.

Referring to fig. 10, specifically, the tensioning driving mechanism includes a second motor 142, a screw 143 and a nut 144, the second motor 142 is fixed on the fixing seat 13, the second motor 142 drives the screw 143 to run, the nut 144 is screwed on the screw 143, and the second end of the supporting rod 141 is connected to the nut 144.

Both ends of the supporting rod 141 are respectively hinged with the driving assembly 11 and the nut 144, when the nut 144 moves towards the fixing seat 13 on the screw 143, one hinged end of the driving assembly 11 and the supporting rod 141 moves towards the direction away from the tensioning assembly 14 by taking the tensioning assembly 14 as the center, namely: one end of the traveling assembly 11 hinged with the supporting rod 141 approaches the inner wall of the pipeline, and then the wheels 114 arranged on the traveling assembly 11 approach the inner wall of the pipeline; when the nut 144 moves away from the fixing seat 13 in the direction of the screw 143, one end of the traveling assembly 11 hinged with the supporting rod 141 moves towards the direction close to the tensioning assembly 14 by taking the tensioning assembly 14 as the center, namely, one end of the traveling assembly 11 hinged with the supporting rod 141 is away from the inner wall of the pipeline, and then, the wheel 114 arranged on the traveling assembly 11 is away from the inner wall of the pipeline, so that the diameter of the circumference where the wheels 114 of at least two traveling assemblies 11 are arranged is adjusted, and the robot is adjusted according to pipelines with different inner diameters, so as to adapt to traveling in the pipelines with different inner diameters.

In the present embodiment, the gear motor 111, the first motor 123, the second motor 142, and the like are uniformly controlled by the controller. When the robot walks in the pipeline, the controller controls the gear motor 111 so as to control the walking speed; when turning is needed, the controller controls the corresponding first motor 123 in the wire feeding assembly 12 to pump the corresponding flexible shaft 2, so that the turning function is realized; when the robot is required to stably stop at a certain position in the pipeline, the controller controls the speed reducing motor 111 and the first motor 123 to stop outputting power, and controls the second motor 142 to output power so that the tensioning assembly 14 is stretched relative to the pipe wall to be tensioned in the pipeline.

Referring to fig. 11, in addition to the above embodiment, the tension driving mechanism may further include a coil spring 145, a guide post 146 and a moving member 147, wherein the guide post 146 is fixed on the fixed seat 13, the coil spring 145 is sleeved on the guide post 146, one end of the coil spring 145 is fixedly connected with the fixed seat 13, and the other end of the coil spring 145 is fixedly connected with the moving member 147, and the coil spring 145 provides a pulling force to the moving member 147 when the coil spring 145 is stretched by the moving member 147, or provides a pushing force to the moving member 147 when the coil spring 145 is compressed by the moving member 147, which is far away from the fixed seat 13.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. A pipe robot, comprising: two driving modules (1) and at least two flexible shafts (2);

at least two flexible shafts (2) are arranged between the two driving modules (1), and two ends of the at least two flexible shafts (2) are respectively arranged in the corresponding driving modules (1);

the driving module (1) comprises a driving assembly (11), a wire feeding assembly (12) and a fixed seat (13), wherein the wire feeding assembly (12) and the driving assembly (11) are both arranged on the fixed seat (13), the wire feeding assemblies are in one-to-one correspondence with the flexible shafts, the end parts of the flexible shafts (2) penetrate through the corresponding wire feeding assemblies (12), the wire feeding assemblies (12) penetrated by the same flexible shaft (2) are pumped along the axis of the flexible shaft (2), and the driving assembly (11) is used for moving in a pipeline;

the pipeline robot further comprises an air pump assembly and two air bags (5), the two air bags (5) are respectively sleeved on the two fixing seats (13), the two air bags (5) are connected with the air pump assembly, and when the air bags (5) are filled with air, the outer parts of the air bags (5) can be propped against the inner wall of the pipeline;

the wire feeding assembly (12) comprises a bench (121), a first motor (123), a driving wheel (124) and a first driven wheel (125);

the first motor (123) is fixed on the bench (121), the driving wheel (124) is connected with an output shaft of the first motor (123), and the first driven wheel (125) is rotatably arranged on the bench (121);

the flexible shaft (2) is inserted between the driving wheel (124) and the first driven wheel (125), and the driving wheel (124) rotates to pump the flexible shaft (2) along the axial direction of the flexible shaft (2);

the running assembly (11) comprises a speed reducing motor (111), a running assembly rack (112), a rotating shaft and wheels (114);

the traveling assembly rack (112) is arranged on the fixed seat (13), the speed reduction motor (111) is fixed on the traveling assembly rack (112), and the wheels (114) are connected to an output shaft of the speed reduction motor (111) through the rotating shaft;

the driving module (1) further comprises a tensioning assembly (14), the tensioning assembly (14) comprises a supporting rod (141) and a tensioning driving mechanism, and the tensioning driving mechanism is installed on the fixing seat (13); the first end of the supporting rod (141) is connected with the running assembly (11), the second end of the supporting rod (141) is connected with the tensioning driving mechanism, and the tensioning driving mechanism drives the running assembly (11) to be abutted to the inner wall of the pipeline through the supporting rod (141).

2. The pipe robot of claim 1, wherein the wire feed assembly (12) further comprises an adjustment seat (122), a second driven wheel (126);

a first end of the adjusting seat (122) is rotatably mounted on the bench (121), a second end of the adjusting seat (122) is elastically connected with the bench (121), the first driven wheel (125) is rotatably mounted on the adjusting seat (122), and the second driven wheel (126) is rotatably mounted on the bench (121);

the flexible shaft (2) is inserted between the driving wheel (124), the first driven wheel (125) and the second driven wheel (126), the driving wheel (124) and the second driven wheel (126) are positioned on the same side of the flexible shaft, and the first driven wheel (125) is positioned between the driving wheel (124) and the second driven wheel (126).

3. The pipeline robot of claim 2 wherein the wire feed assembly (12) further comprises an adjustment nut (127), a T-shaft (128), and a spring (129);

the second end of adjusting seat (122) has seted up the through-hole, the big head end of T type axle (128) with rack (121) are connected, after the tip of T type axle (128) passes through the through-hole spring (129) cover is established on T type axle (128), adjusting nut (127) are installed the tip of T type axle (128) and support and press spring (129).

4. A pipe robot according to any of claims 1-3, characterized in that the pipe robot further comprises at least one profiled plate (3);

the periphery of the shaping plate (3) is provided with first through grooves (31), and the flexible shafts (2) correspondingly penetrate through the first through grooves (31) one by one.

5. The pipe robot according to claim 4, characterized in that the pipe robot further comprises a limit rope (4);

the center of the shaping plate (3) is provided with a second through groove (32), the limiting rope (4) penetrates through the second through groove (32) of the shaping plate (3) and is knotted at the corresponding second through groove (32) of the shaping plate (3), and two ends of the limiting rope (4) are respectively connected to corresponding fixing seats (13).

6. The pipe robot according to claim 1, wherein the traveling assembly (11) comprises a gear motor (111), a traveling assembly gantry (112), two hexagonal spindles (113) and two wheels (114);

the speed reducing motor (111) is fixed on the travelling assembly rack (112), one ends of the two hexagonal rotating shafts (113) are connected with the speed reducing motor (111), the other ends are output ends, and the two wheels (114) are correspondingly arranged on the output ends of the hexagonal rotating shafts (113) one by one.

7. The pipe robot according to claim 6, wherein the tensioning driving mechanism comprises a second motor (142), a screw (143) and a nut (144), the second motor (142) is fixed on the fixing base (13), the second motor (142) drives the screw (143) to operate, the nut (144) is in threaded connection with the screw (143), and the second end of the supporting rod (141) is connected with the nut (144); or alternatively, the process may be performed,

the tensioning driving mechanism comprises a spiral spring (145), a guide column (146) and a moving part (147), wherein the guide column (146) is fixed on the fixed seat (13), the guide column (146) is sleeved with the spiral spring (145), one end of the spiral spring (145) is fixedly connected with the fixed seat (13), the other end of the spiral spring is fixedly connected with the moving part (147), when the spiral spring (145) is stretched by the moving part (147), the spiral spring (145) provides a pulling force close to the fixed seat (13) for the moving part (147), or when the spiral spring (145) is compressed by the moving part (147), the spiral spring (145) provides a pushing force far away from the fixed seat (13) for the moving part (147).