CN106184556B

CN106184556B - Multi-section pipe sleeve structure

Info

Publication number: CN106184556B
Application number: CN201610677769.6A
Authority: CN
Inventors: 葛伟益
Original assignee: Wuxi Shenyang Motor Technology Co ltd
Current assignee: Wuxi Shenyang Motor Technology Co ltd
Priority date: 2016-08-17
Filing date: 2016-08-17
Publication date: 2020-04-24
Anticipated expiration: 2036-08-17
Also published as: CN106184556A

Abstract

The invention provides a multi-section pipe sleeve structure, which can solve the problems of poor locking effect, potential safety hazard and inconvenient adjustment of the multi-section pipe sleeve structure. The bottom of inner tube cup joints in the outer tube top in circle and can be at the intraductal rectilinear translation of outer tube, and the seat is found to the top rigid coupling handlebar of inner tube, and the locking hole has been seted up respectively to the upper and lower both sides of outer tube pipe wall, and auto-lock stop gear can follow are installed to the bottom of inner tube the inner tube is overlapped in the top of inserting the outer tube together, and auto-lock stop gear is equipped with the spring bolt that can radially slide, and the spring bolt can realize with the locking hole cooperation that relative locking between outer tube and the inner tube is spacing or can move, thereby trigger mechanism in the seat can move the interior guiding mechanism vertical movement of inner tube and trigger the vertical action of auto-lock stop gear and convert vertical displacement into the radial horizontal migration of spring bolt simultaneously and trigger the locking or the unblock between spring.

Description

Multi-section pipe sleeve structure

Technical Field

The invention relates to the field of small-sized folding vehicle structures, in particular to the technical field of structures for folding bicycles and folding scooters, and particularly relates to a multi-section pipe sleeve structure.

Background

The front fork part of the current folding bicycle or folding electric bicycle or folding scooter mostly adopts a multi-section sleeve structure to realize telescopic folding, the existing multi-section sleeve structure is to sleeve an upper inner tube in a lower outer tube, the tube walls of the inner tube and the outer tube are provided with matched vertical concave-convex grooves to realize vertical linear motion, and meanwhile, the outer tube is radially clamped by a clamping adjusting device assembled at the periphery of the outer tube between the inner tube and the outer tube to ensure that the outer tube generates rigid deformation so as to achieve the purpose of controlling the outer tube to embrace the inner tube and finally realize locking positioning between the outer tube and the inner tube. The disadvantages are that: the outer pipe is rigidly deformed to achieve the cohesion locking between the outer pipe and the inner pipe, so that the requirements on the material of the outer pipe are high; meanwhile, gaps between the inner pipe and the outer pipe and between the outer pipe and the clamping and adjusting device can influence the locking effect, and after long-term use, the clamping and adjusting device and the outer pipe can be seriously abraded, so that the outer surface of a product is influenced, and reliable locking between the outer pipe and the inner pipe cannot be realized, and thus potential safety hazards exist in the running process of a vehicle; in addition, if the front fork component of the existing folding bicycle or folding electric bicycle is of a three-section or more pipe sleeve structure, a clamping adjusting device needs to be assembled between two adjacent sections of pipe pieces, and the clamping adjusting device needs to be manually adjusted one by one in the actual use process to realize the contraction or extension of each section of pipe sleeve piece, so that the adjustment is inconvenient and the efficiency is low.

Disclosure of Invention

Aiming at the problems, the invention provides a multi-section pipe sleeve structure which can solve the problems of poor locking effect, potential safety hazard and inconvenient adjustment of the multi-section pipe sleeve structure.

Its technical scheme is such, it includes an outer tube and an inner tube, the bottom of inner tube cup joint in the circle and the inner tube can be in the interior straight line translation of outer tube in the top rigid coupling handlebar of inner tube stands the seat, the top periphery of outer tube is provided with presss from both sides tight adjusting device, its characterized in that: the upper and lower sides of the wall of the outer tube are respectively provided with a locking hole, the bottom end of the inner tube is provided with a self-locking limiting mechanism which can be sleeved into the inner circle at the top of the outer tube along with the inner tube, the self-locking limiting mechanism is provided with a lock tongue capable of sliding in the radial direction, the lock tongue can be matched with the locking hole to realize relative locking limiting or movement between the outer pipe and the inner pipe, a trigger mechanism which can move vertically is arranged in the handle stand seat, a vertical guide mechanism is arranged in the inner tube, the trigger mechanism is connected with the self-locking limiting mechanism through the guide mechanism, the trigger mechanism drives the guide mechanism to move vertically and triggers the self-locking limiting mechanism to move vertically, vertical displacement is converted into radial horizontal movement of the lock tongue, and therefore locking or unlocking between the lock tongue and the locking hole is triggered to achieve position locking or telescopic adjustment between the outer pipe and the inner pipe.

Furthermore, the self-locking limiting mechanism comprises a limiting plug, a pushing block, a sliding block and a spring, the limiting plug is sealed at the bottom end part of the inner hole of the inner tube, the limiting plug comprises a plug body part and a bottom outer edge part which are connected concentrically, the plug body part of the limiting plug is embedded in the inner hole at the bottom end of the inner tube, the bottom outer edge part limits the bottom end surface of the inner tube, the outer surface of the bottom outer edge part is in clearance fit with the inner cavity of the outer tube, a vertical through hole is formed in the plug body part of the limiting plug, and a radial blind hole communicated with the vertical through hole is formed in the bottom outer edge part; the push block is slidably mounted in an inner hole of the inner tube, a push rod part is arranged at the bottom end of the push block, the push rod part extends into a vertical through hole of the limiting plug, the sliding block is slidably mounted in a radial blind hole of the limiting plug, one end of the spring bolt and one end of the rear end connecting spring are arranged at the front end of the sliding block, the other end of the spring is abutted to the bottom of the radial blind hole, an inclined wedge-shaped groove is formed in a position, close to the rear end, of the top surface of the sliding block, and the bottom surface of the push rod part is an inclined wedge surface matched with the inclined wedge-shaped groove.

Furthermore, the triggering mechanism comprises a key, a return spring and a key positioning plate, the key positioning plate is installed at the bottom of the vertical seat, a center pin shaft is arranged at the bottom of the key and vertically penetrates through the center of the vertical seat, then is fixedly connected with the key positioning plate and is abutted against the guide mechanism, guide pillars are symmetrically arranged on the bottom surface of the key, vertical blind holes are symmetrically formed in the vertical seat, the return spring is installed in the vertical blind holes, the bottom end of the return spring is abutted against the bottom of the vertical blind holes, the top end of the return spring is abutted against the key, and the length of the center pin shaft is greater than the thickness of the vertical seat.

Furthermore, the guide mechanism comprises an upper guide plate and a lower guide plate which are slidably mounted in the inner tube, the top of the upper guide plate is connected with the trigger mechanism in an abutting mode, the lower guide plate is connected with the self-locking limiting mechanism in an abutting mode, and the upper guide plate is connected with the lower guide plate in an abutting mode through a guide rod.

Furthermore, the key positioning plate is fixedly connected with the center pin shaft, the upper guide plate is connected with the key positioning plate in an abutting mode, and the lower guide plate is connected with the push block in an abutting mode.

Furthermore, the guide rods are provided with two guide rods, two mounting hole grooves are formed in the bottom of the upper guide plate and the top of the lower guide plate respectively, and the two ends of the guide rods are connected with the mounting hole grooves in a clamped mode respectively.

Furthermore, the pipe clamp further comprises a middle pipe, the top end and the bottom end of the middle pipe are respectively sleeved with the bottom end of the inner pipe and the top end of the outer pipe, the inner pipe and the middle pipe can respectively linearly translate in the middle pipe and the outer pipe, a group of clamping adjusting devices are arranged on the periphery of the top of the middle pipe, locking holes are respectively formed in the upper side and the lower side of the pipe wall of the middle pipe, the locking holes are matched with self-locking limiting mechanisms at the bottoms of the inner pipes under the action of the trigger mechanism and the guide mechanism to achieve position locking or telescopic adjustment between the inner pipes and the middle pipe, and a group of self-locking limiting mechanisms are arranged at the bottom of the middle pipe and are matched with the locking holes at the top of the outer pipes to achieve position locking or telescopic adjustment.

Furthermore, the two sides of the vertical seat are respectively rotatably provided with an L-shaped safety buckle, and when the inner pipe is contracted in the middle pipe, the bottom plane of the L-shaped safety buckle is attached to the top surface of the clamping adjusting device on the periphery of the top of the middle pipe by rotating the L-shaped safety buckle to be in a vertical state.

Furthermore, open slots are respectively arranged on the top port of the middle pipe and the top port of the outer pipe, and the clamping adjusting devices are respectively arranged at the positions of the open slots.

Furthermore, an inner sliding sleeve is respectively embedded in the inner circle at the top of the middle pipe and the inner circle at the top of the outer pipe, and the bottom of the inner pipe and the bottom of the middle pipe are respectively connected into the middle pipe and the outer pipe through the inner sliding sleeve.

The invention has the beneficial effects that: the telescopic adjustment is convenient and reliable, the self-locking limiting mechanism is arranged at the bottom of the inner pipe, the locking hole matched with the self-locking limiting mechanism is arranged on the pipe wall of the outer pipe, the guide mechanism is triggered by the trigger mechanism, and the self-locking limiting mechanism is triggered by the guide mechanism to act so as to realize the locking or the opening between the lock tongue and the locking hole, particularly, the self-locking limiting mechanism realizes the automatic locking or the separation between the lock tongue and the locking hole at the front end of the slide block through the inclined wedge surface matching between the bottom surface of the push rod part of the push block and the top surface of the slide block and the rebound action of a spring at the rear end of the slide block, thereby realizing the reliable position locking or the telescopic adjustment between the inner pipe and the; simultaneously, the clamping adjusting device is respectively arranged at the open grooves formed in the top port of the middle pipe and the top port of the outer pipe, so that the gaps between the inner pipe and the middle pipe and between the middle pipe and the outer pipe can be effectively adjusted, the shaking between the two sleeved pipe fittings is avoided, and the use stability of the whole pipe sleeve structure is further ensured.

Drawings

FIG. 1 is a schematic view of the inner cross-section of a multi-segment tubular sleeve structure of the present invention in a fully expanded state;

FIG. 2 is a schematic cross-sectional view of the inner tube of the multi-joint pipe sleeve structure of the present invention in a state where the inner tube is contracted in the inner tube cavity of the middle tube;

FIG. 3 is a schematic view of the multi-sectioned pipe sleeve structure of the present invention in a second viewing orientation with the inner pipe collapsed within the lumen of the middle pipe;

FIG. 4 is a schematic view of the inner cross-section of a multi-section shroud structure of the present invention in a fully collapsed condition;

FIG. 5 is an enlarged schematic view of a self-locking stop mechanism 60 mounted at the bottom end of the inner tube in the multi-joint tube sleeve structure according to the present invention;

FIG. 6 is a schematic view of the multi-segment tubular sleeve structure of the present invention in a fully expanded state;

FIG. 7 is a schematic view of the multi-joint pipe sleeve structure of the present invention in a state where the inner pipe is contracted inside the middle pipe lumen;

reference numerals: 10-outer tube, 11-inner sliding sleeve, 12-open slot, 13-locking hole, 14-locking hole, 20-middle tube, 21-inner sliding sleeve, 22-open slot, 23-locking hole, 24-locking hole, 30-inner tube, 40-vertical seat, 50-clamping adjusting device, 60-self-locking limiting mechanism, 61-limiting plug, 611-plug body part, 612-bottom outer edge part, 613-vertical through hole, 614-radial blind hole, 62-push block, 621-push rod part, 63-slide block, 631-inclined wedge groove, 64-spring, 65-lock tongue, 60 '-self-locking limiting mechanism, 61' -limiting plug, 611 '-plug body part, 612' -bottom outer edge part, 613 '-vertical through hole, 614' -radial blind hole, 62 '-push block, 621' -push rod part, 63 '-slide block, 631' -inclined wedge-shaped groove, 64 '-spring, 65' -bolt, 70-trigger mechanism, 71-key, 711-central pin shaft, 712-guide column, 72-return spring, 73-key positioning plate, 74-locking nut, 80-guide mechanism, 81-upper guide plate, 82-lower guide plate, 83-guide rod, 84-mounting hole groove and 90-L-shaped safety catch.

Detailed Description

Referring to fig. 1 to 7, the multi-joint pipe sleeve structure of the present embodiment includes an outer pipe 10, a middle pipe 20 and an inner pipe 30, wherein inner

sliding sleeves

21 and 11 are respectively embedded in an inner circle of a top portion of the middle pipe 20 and an inner circle of a top portion of the outer pipe 10, bottoms of the inner pipe 30 and the middle pipe 20 are respectively sleeved in the middle pipe 20 and the outer pipe 10 through the inner

sliding sleeves

21 and 11, the inner pipe 30 and the middle pipe 20 can respectively linearly translate in the middle pipe 20 and the outer pipe 10, a handlebar stem 40 is fixedly connected to a top portion of the inner pipe 30,

open slots

22 and 12 are respectively formed in a top end port of the middle pipe 20 and a top end port of the outer pipe 30, clamping adjusting devices 50 are respectively installed at positions of the

open slots

22 and 12, the clamping adjusting devices 50 respectively clamp the outer pipe 10 and the middle pipe 20 and the inner pipe 10 from the outer periphery, the clamping adjusting devices 50 can be in a conventional hoop or hoop form, and the hoop is clasped from the, Adjusting the gap between the outer pipe 10 and the middle pipe 20; the arrangement of the

open grooves

22 and 12 enables the tops of the middle pipe 20 and the outer pipe 30 to be easily deformed under the action of the respective clamping adjusting devices 50, so that the gap between the middle pipe 20 and the inner pipe 30 and the gap between the outer pipe 10 and the middle pipe 20 can be conveniently adjusted, the shaking between two sleeved pipe fittings can be avoided, and the stability of the whole pipe sleeve structure can be ensured; the upper and lower sides of the pipe wall of the middle pipe 20 are respectively provided with

locking holes

23 and 24, the upper and lower sides of the pipe wall of the outer pipe 10 are respectively provided with

locking holes

13 and 14, and the bottom ends of the inner pipe 30 and the outer pipe 20 are respectively provided with self-locking limiting mechanisms 60 and 60' with the same structure.

The structure of the self-locking limiting mechanism 60 will be described specifically by taking the self-locking limiting mechanism 60 installed at the bottom end of the inner tube 30 as an example: the limiting stopper 61 is packaged at the bottom end part of an inner hole of the inner tube 30, the limiting stopper 61 comprises a stopper body 611 and a bottom outer edge part 612 which are concentrically connected, the stopper body 611 of the limiting stopper is embedded in the inner hole of the bottom end of the inner tube 30, the bottom outer edge part 612 limits the bottom end surface of the inner tube 30, the outer surface of the bottom outer edge part 612 is in clearance fit with the inner cavity of the outer tube 10, and when relative linear translation occurs between the inner tube and the outer tube, the bottom outer edge part 612 of the limiting stopper 61 can play a role in guiding; a vertical through hole 613 is formed in the plug body 611 of the limiting plug, and a radial blind hole 614 communicated with the vertical through hole 613 is formed in the bottom outer edge 612; the push block 62 is slidably mounted in an inner hole of the inner tube 30, a push rod portion 621 is arranged at the bottom end of the push block 62, the push rod portion 621 extends into a vertical through hole 613 of the limit plug, the slide block 63 is slidably mounted in a radial blind hole 614 of the limit plug, a lock tongue 65 is arranged at the front end of the slide block 63, one end of a spring 64 is connected with the rear end, the other end of the spring 64 is abutted to the bottom of the radial blind hole 614, an inclined wedge-shaped groove 631 is arranged at a position, close to the rear end, of the top surface of the slide block 63, and an inclined wedge surface matched with the inclined wedge-shaped groove 631 is.

The vertical base 40 is internally provided with a vertically movable trigger mechanism 70, the trigger mechanism 70 comprises a key 71, a return spring 72 and a key positioning plate 73, the key positioning plate 73 is installed at the bottom of the vertical base 40, the bottom of the key 71 is provided with a center pin shaft 711, the center pin shaft 711 vertically penetrates through the center of the vertical base 40 and then is fixedly connected with the key positioning plate 73 in sequence, and a guide mechanism 80 is fixedly connected with the guide mechanism through a locking nut 74, the bottom surface of the key 71 is further symmetrically provided with guide pillars 712, vertical blind holes are symmetrically formed in the vertical base 40, the return spring 72 is installed in the vertical blind holes, the bottom end of the return spring 72 is abutted against the bottom of the vertical blind holes, the top end of the return spring is connected with the.

The guide mechanism 80 comprises an upper guide plate 81 and a lower guide plate 82 which are slidably arranged in the inner tube 30, the upper guide plate 81 is connected with the trigger mechanism in an abutting mode, the lower guide plate 82 is connected with the self-locking limiting mechanism in an abutting mode, and the upper guide plate 81 is connected with the lower guide plate 82 through a guide rod 83; the upper guide plate 81 is fixedly connected with the key positioning plate 73 and the central pin shaft 711 through the locking nut 74, and the lower guide plate 82 is fixedly connected with the push block 62; two guide rods 83 are arranged, two mounting hole grooves 84 are respectively formed in the bottom of the upper guide plate 81 and the top of the lower guide plate 82, and two ends of the two guide rods 83 are respectively clamped with the mounting hole grooves 84.

When the outer tube 10, the middle tube 20 and the inner tube 30 are completely unfolded, under the action of the elastic restoring force of the return spring 72 of the trigger mechanism 70 and driven by the whole guide mechanism 80, the push block 62 of the self-locking limiting mechanism 60 at the bottom end of the inner tube 30 is separated from the inclined wedge-shaped groove 631 of the slide block 63 in the radial blind hole 614 of the limiting plug 61, and at the moment, the slide block 63 is popped outwards under the action of the spring 64, so that the lock tongue 65 at the front end of the slide block 63 extends into the lock hole at the upper part of the middle tube 20 to realize the matching locking of the inner tube 30 and the middle tube 20; meanwhile, the top of the push block 62 'in the self-locking limiting mechanism 60' at the bottom end of the middle pipe is not subjected to downward pressure from the upper inner pipe 30, so that the slide block 63 'in the limiting plug 61' of the self-locking limiting mechanism 60 'moves outwards in the radial blind hole under the action of the spring 64', and the lock tongue 65 'at the front end of the slide block 63' extends into the lock hole at the upper part of the outer pipe 10, thereby realizing the locking between the middle pipe 20 and the outer pipe 30.

When the outer tube 10, the middle tube 20 and the inner tube 30 need to be converted from the fully expanded state to the fully contracted state, the key 71 is pressed downwards, the key 71 overcomes the elastic force of the return spring 72 to compress the return spring 72, and the key 71 pushes the key positioning plate 72, the upper guide plate 81, the guide rod 83 and the lower guide plate 82 to move downwards integrally through the central pin shaft 711, because the lower guide plate 82 is fixedly connected with the top surface of the push block 62 of the self-locking limiting mechanism installed at the bottom end of the inner tube 30, the push block 62 is synchronously pushed downwards to enable the inclined surface at the bottom of the push rod part 621 at the lower end of the push block 62 to be matched with the groove surface of the inclined wedge-shaped groove 631 of the slide block 63 in the radial blind hole 614 of the limiting plug 61 and push the slide block 63 to retreat back into the radial blind hole 614 under the elastic force of the spring 64, so as to drive the lock tongue 65 at the front end of the slide block, the inner pipe 30 can move downwards along the inner hole of the middle pipe 20 to shrink; when the inner tube 30 moves down to the bottom surface of the limit plug 61 of the self-locking limit mechanism 60 at the bottom end thereof and collides with the top surface of the push block 62 'of the self-locking limit mechanism 60' arranged at the bottom end of the middle tube 20, on one hand, the lock tongue 65 is just opposite to the locking hole 24, and the slide block 63 moves outwards under the resilience force of the spring 64, so that the lock tongue 65 at the front end of the slide block 63 is driven to move outwards and extend into the locking hole 24 at the lower part of the middle tube 20 to realize locking and positioning of the inner tube 30 and the middle tube 20 in; on the other hand, the push block 62 ' moves downwards after receiving the downward impact force of the inner tube 30 and pushes the slide block 63 ' to retreat into the radial blind hole 614 ' against the acting force of the spring 64 ' and to simultaneously drive the latch bolt 65 ' to withdraw from the latch hole 13 at the upper part of the outer tube 10, at this time, the middle tube 20 and the outer tube 10 are unlocked, the middle tube 20 can drive the whole inner tube 10 to move downwards along the inner hole of the outer tube 10 to contract, when the middle tube 20 falls to the latch bolt 65 ' and is opposite to the latch hole 14 at the lower part of the outer tube, the slide block 63 ' moves outwards under the action of the resilience force of the spring 64 ', so as to drive the latch bolt 65 ' at the front end to move outwards and extend into the latch hole 14 at the lower part of the outer tube 10 to realize the locking and positioning between the middle tube 20 and;

in the above shrinking process, if the unfolding and locking between the middle tube 20 and the outer tube 30 still needs to be maintained after the inner tube 30 is shrunk into the middle tube 20, at this time, the L-shaped safety catches 90 on the two sides of the vertical seat 40 can be clockwise rotated to be in a vertical state, so that the bottom plane of the L-shaped safety catches 90 is attached to the top surface of the clamping and adjusting device 50 on the periphery of the top of the middle tube 20, and as the self-locking limiting mechanism 60 at the bottom end of the isolation inner tube 30 of the L-shaped safety positioning catch 90 cannot be contacted with the self-locking limiting mechanism 60' at the bottom of the middle tube 20, the locking between the middle tube 20 and the outer tube 10 is continuously maintained, the purpose of single-section shrinkage of the inner tube 30; when the middle tube 20 needs to be retracted continuously, the L-shaped safety catch 90 only needs to be rotated counterclockwise and upward to separate the bottom plane from the top surface of the clamping and adjusting device 50 at the top periphery of the middle tube 20, and then the inner tube 30 moves downward continuously under the action of gravity and touches the self-locking limiting mechanism 60' at the bottom end of the middle tube 20, so that the inner tube 30 and the middle tube 20 are finally retracted into the outer tube 10 completely.

When the outer pipe 10, the middle pipe 20 and the inner pipe 30 need to be converted into a fully expanded state from a fully contracted state, only the handle 40 needs to be lifted upwards, so that the inner pipe 30 is driven to move upwards simultaneously, the lock tongue 65 of the self-locking limiting mechanism 60 is attached to the inner hole wall of the middle pipe 20 in the upward movement process, when the inner pipe 30 moves to the state that the lock tongue 65 is aligned with the locking hole 23, the sliding block 63 pops outwards under the elastic action of the spring 65, so that the lock tongue 65 is inserted into the locking hole 23, and at the moment, the self-locking limiting mechanism 60 is contacted with the inner sliding sleeve 21 of the middle pipe 20 to limit the inner pipe 30 to continuously move upwards; the handle 40 is lifted up continuously, the middle pipe 20 is driven to go up continuously through the inner pipe 30, and the middle pipe 20 repeats the lifting steps until the middle pipe 20 is locked with the outer pipe 10.

The multi-section pipe sleeve structure can also be suitable for folding scooters or folding electric balance cars.

Claims

1. The multi-section pipe sleeve structure comprises an outer pipe and an inner pipe, wherein the bottom of the inner pipe is sleeved on the inner circle at the top of the outer pipe, the inner pipe can linearly translate in the outer pipe, the top of the inner pipe is fixedly connected with a handlebar vertical seat, and the periphery of the top of the outer pipe is provided with a clamping adjusting device, and the multi-section pipe sleeve structure is characterized in that: the upper and lower sides of the wall of the outer tube are respectively provided with a locking hole, the bottom end of the inner tube is provided with a self-locking limiting mechanism which can be sleeved into the inner circle at the top of the outer tube along with the inner tube, the self-locking limiting mechanism is provided with a lock tongue capable of sliding in the radial direction, the lock tongue can be matched with the locking hole to realize relative locking limiting or movement between the outer pipe and the inner pipe, a trigger mechanism which can move vertically is arranged in the handle stand seat, a vertical guide mechanism is arranged in the inner tube, the trigger mechanism drives the guide mechanism to move vertically and trigger the self-locking limiting mechanism to move vertically and convert vertical displacement into radial horizontal movement of the lock tongue so as to trigger locking or unlocking between the lock tongue and the locking hole and realize position locking or telescopic adjustment between the outer pipe and the inner pipe; the self-locking limiting mechanism comprises a limiting plug, a push block, a sliding block and a spring, the limiting plug is sealed at the bottom end part of the inner hole of the inner tube, the limiting plug comprises a plug body part and a bottom outer edge part which are connected concentrically, the plug body part of the limiting plug is embedded in the inner hole at the bottom end of the inner tube, the bottom outer edge part limits the bottom end surface of the inner tube, the outer surface of the bottom outer edge part is in clearance fit with the inner cavity of the outer tube, a vertical through hole is formed in the plug body part of the limiting plug, and a radial blind hole communicated with the vertical through hole is formed in the bottom outer edge part; the self-locking push block is slidably mounted in an inner hole of the inner tube, a push rod part is arranged at the bottom end of the push block, the push rod part extends into a vertical through hole of the limiting plug, the slide block is slidably mounted in a radial blind hole of the limiting plug, the front end of the slide block is provided with the lock tongue, the rear end of the slide block is connected with one end of a spring, the other end of the spring is abutted against the bottom of the radial blind hole, an inclined wedge-shaped groove is formed in the position, close to the rear end, of the top surface of the slide block, and the bottom surface of the push rod part is an inclined wedge surface matched with the inclined wedge-shaped; the trigger mechanism comprises a key, a return spring and a key positioning plate, the key positioning plate is installed at the bottom of the upright seat, a central pin shaft is arranged at the bottom of the key, the central pin shaft vertically penetrates through the center of the upright seat and then is fixedly connected with the key positioning plate and abutted against the guide mechanism, guide pillars are symmetrically arranged on the bottom surface of the key, vertical blind holes are symmetrically formed in the upright seat, the return spring is installed in the vertical blind holes, the bottom end of the return spring is abutted against the bottom of the vertical blind hole, the top end of the return spring is abutted against the lower end face of the key, and the length of the central pin shaft is larger than the thickness of the upright seat; the guide mechanism comprises an upper guide plate and a lower guide plate which are slidably arranged in the inner tube, the top of the upper guide plate is connected with the trigger mechanism in an abutting mode, the lower guide plate is connected with the self-locking limiting mechanism in an abutting mode, and the upper guide plate is connected with the lower guide plate through a guide rod; the key positioning plate is fixedly connected with the center pin shaft, the upper guide plate is connected with the key positioning plate in an abutting mode, and the lower guide plate is connected with the push block in an abutting mode; the two guide rods are arranged, the bottom of the upper guide plate and the top of the lower guide plate are respectively provided with two mounting hole grooves, and two ends of the two guide rods are respectively clamped with the mounting hole grooves; the pipe clamp is characterized by further comprising a middle pipe, wherein the top end and the bottom end of the middle pipe are respectively sleeved with the bottom end of the inner pipe and the top end of the outer pipe, the inner pipe and the middle pipe can respectively linearly translate in the middle pipe and the outer pipe, a group of clamping and adjusting devices are arranged on the periphery of the top of the middle pipe, locking holes are formed in the upper side and the lower side of the pipe wall of the middle pipe respectively, the locking holes are matched with self-locking limiting mechanisms at the bottoms of the inner pipes under the action of the trigger mechanism and the guide mechanism to achieve position locking or telescopic adjustment between the inner pipes and the middle pipe, a group of self-locking limiting mechanisms are arranged at the bottom of the middle pipe, and the self-locking limiting mechanisms are matched with the locking holes at; the two sides of the vertical seat are respectively rotatably provided with an L-shaped safety buckle, and when the inner pipe is contracted in the middle pipe, the bottom plane of the L-shaped safety buckle is attached to the top surface of the clamping and adjusting device at the periphery of the top of the middle pipe by rotating the L-shaped safety buckle to be in a vertical state.

2. The multi-joint pipe sleeve structure of claim 1, wherein: open grooves are respectively formed in the top port of the middle pipe and the top port of the outer pipe, and the clamping adjusting devices are respectively installed at the positions of the open grooves.

3. The multi-joint pipe sleeve structure of claim 1, wherein: the inner circle at the top of the middle pipe and the inner circle at the top of the outer pipe are respectively embedded with an inner sliding sleeve, and the bottom of the inner pipe and the bottom of the middle pipe are respectively connected into the middle pipe and the outer pipe through the inner sliding sleeve.