CN220505513U - Telescopic tube structure - Google Patents

Abstract

The application provides a telescopic tube structure. It comprises the following steps: at least two sections of sleeves which are sleeved with each other and can slide along the axial direction; the locking assembly is arranged in the hollow interior of the sleeve and positioned between two adjacent sections of the sleeve and is used for locking or releasing the two adjacent sections of the sleeve; the adjusting assembly comprises a fixing piece, an elastic abutting ring and an adjusting piece; the fixing piece is fixedly arranged at the end part of the previous sleeve; the abutting ring is clamped between the inner side wall and the outer side wall of two adjacent sections of sleeves and is fixed by the fixing piece in the axial direction, and a conical surface is formed on the outer peripheral surface of the bottom end of the abutting ring; the adjusting piece is movably arranged on the fixing piece along the axial direction, an inclined surface is formed on one surface of the adjusting piece, which is opposite to the abutting ring, and when the adjusting piece moves along the axial direction, the inclined surface extrudes the conical surface so as to reduce the gap between the abutting ring and the subsequent sleeve. The telescopic pipe structure provided by the application has the advantage that the stability of each section of sleeve pipe after the sleeve pipe is completely extended is good.

Description

Telescopic tube structure

Technical Field

The application belongs to photographic equipment accessory technical field, and more specifically relates to a flexible pipe structure.

Background

The foot rest comprises a plurality of stages of telescopic pipes. In the related art, a locking structure is arranged between two adjacent sections of telescopic pipes for locking the two adjacent sections of telescopic pipes, and meanwhile, in order to enable each section of telescopic pipes to be telescopic smoothly, gaps are reserved between each section of telescopic pipes, however, the telescopic pipes are limited by the precision of production, manufacture and assembly, and the gaps of different product batches may be different. Therefore, after the telescopic pipes of all stages are fully extended, the structure of the telescopic pipes is long and is limited by the existence of gaps between the telescopic pipes, and the locking and fixing of the locking structure to a single axial position on the telescopic pipes are not enough to compensate the influence of the gaps on the shaking of the telescopic pipes.

Disclosure of Invention

An object of the embodiment of the application is to provide a flexible pipe structure to solve the flexible pipe that exists among the prior art and stretch out the technical problem that the back was rocked easily completely.

In order to achieve the above object, a technical solution adopted in an embodiment of the present application is to provide a telescopic tube structure, which includes:

at least two sections of sleeves which are sleeved with each other and can slide along the axial direction;

the locking component is arranged in the hollow interior of the sleeve and positioned between two adjacent sections of the sleeve and is used for locking or releasing the two adjacent sections of the sleeve;

the adjusting assembly comprises a fixing piece, an elastic abutting ring and an adjusting piece; the fixing piece is fixedly arranged at the end part of the previous sleeve; the abutting ring is clamped between the inner side wall and the outer side wall of two adjacent sections of sleeves and is axially fixed by the fixing piece, and a conical surface is formed on the outer peripheral surface of the bottom end of the abutting ring; the adjusting piece is movably arranged on the fixing piece along the axial direction, an inclined surface is formed on one surface of the adjusting piece, which is opposite to the abutting ring, and when the adjusting piece moves along the axial direction, the inclined surface extrudes the conical surface so as to reduce the gap between the abutting ring and the subsequent sleeve.

Optionally, a flange is circumferentially disposed on an outer peripheral wall of the abutment ring; and a limiting part for limiting the flange is arranged on the inner side wall of the fixing piece along the circumferential direction.

Optionally, the adjusting member is a ring body and is in threaded connection with one end of the fixing member, and the inclined surface is formed on the inner peripheral wall of the adjusting member.

Optionally, the locking component comprises a fixed seat, a lock cylinder, a driving piece, a locking piece and a driving rod; the fixed seat is fixedly arranged at the end part of the latter sleeve, the lock cylinder is rotatably arranged on the fixed seat and fixedly sleeved on the outer side of the driving rod in the circumferential direction, and the driving piece is in threaded connection with the outer circumferential surface of the lock cylinder and fixedly arranged in the circumferential direction; when the lock core rotates along with the driving rod, the driving piece moves axially under the driving of the threads so as to drive the locking piece to abut against or release the inner side wall of the sleeve.

Optionally, a first bearing is sleeved on the circumferential surface of the bottom end of the lock cylinder; an adjusting piece is connected with the bottom end of the lock cylinder in a threaded manner; the end surfaces of the two sides of the first bearing are respectively abutted against the fixing seat and the adjusting piece.

Optionally, a shoulder is formed on the peripheral surface of the lock cylinder, a second bearing with an upper end face abutting against the shoulder is sleeved on the peripheral surface of the lock cylinder, and a lower end face of the second bearing can abut against the upper end face of the fixing seat.

Optionally, the driving piece is a ring body in threaded connection with the lock cylinder; the locking piece comprises a guide ring, a fixed ring and rolling balls, wherein the guide ring is provided with a conical surface, the fixed ring is provided with a movable groove along the circumferential direction, the rolling balls are arranged in the movable groove, the fixed ring is arranged on the driving piece, and the rolling balls can abut against the inner side wall of the sleeve under the extrusion of the conical surface.

Optionally, the driving piece and the locking piece are symmetrically arranged in the axial direction of the lock cylinder, and the directions of threads on the two driving pieces are opposite.

Optionally, the fixing rings are sleeved on the outer side of the driving piece, and a spring is sleeved between the two fixing rings.

Optionally, a rolling element is arranged at the top of the lock cylinder, and the rolling element is in rolling contact with the outer side wall of the driving rod.

The telescopic pipe structure provided by the embodiment of the application has the following beneficial effects:

through setting up the mounting at the sheathed tube tip before, with elastic butt ring fixed centre gripping between two sections adjacent sleeve pipes through the mounting, simultaneously, the shaping has the conical surface in butt ring bottom, correspondingly, is provided with the regulating part on the mounting activity, and the regulating part is provided with the inclined plane with the relative one side of butt ring. When the adjusting piece moves on the fixing piece along the axial direction, the inclined surface on the adjusting piece extrudes the conical surface on the abutting ring, so that the bottom of the abutting ring deforms towards the direction close to the outer side peripheral wall of the subsequent sleeve, and the gap between the subsequent sleeve and the abutting ring is reduced. Therefore, when the sleeves of all levels are completely extended and the locking assembly locks and fixes the sleeves of all levels, gaps among the sleeves of all levels are compensated by the abutting rings, so that shaking of the telescopic pipe structure can be reduced, and the stability of the telescopic pipe structure is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a partial cross-sectional view of a telescoping tube structure in accordance with some embodiments of the present application;

FIG. 2 is a partial cross-sectional view of a telescoping tube structure in accordance with some embodiments of the present application;

FIG. 3 is a partial cross-sectional view of a telescoping tube structure in accordance with some embodiments of the present application;

FIG. 4 is a partial cross-sectional view of a telescoping tube structure in some embodiments of the present application.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments.

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element.

When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 4, a description will now be given of a telescopic tube structure according to an embodiment of the present application.

Referring to fig. 1 to 4, the telescopic tube structure described herein includes at least two sleeves 100 sleeved with each other and capable of sliding along an axial direction, wherein a useful locking assembly 200 is disposed in a hollow interior of the sleeve 100, and an adjusting assembly 300 is disposed between two adjacent sleeves 100.

Specifically, the sleeve 100 may be a polygonal tube, such as a rectangular tube, or may be a circular tube or an oval tube, and the sleeve 100 is exemplified herein as a circular tube.

The locking assembly 200 is disposed between two adjacent sections of the sleeve 100 for locking or releasing the two adjacent sections of the sleeve 100 so that each sleeve 100 can be extended or received. It will be appreciated that the locking assembly 200 may be provided with a drive rod 250 and a locking block, the locking being effected by rotation of the drive rod 250 to drive the locking block against the inner side wall of the sleeve 100, as described in the prior chinese patent application with publication number CN 218208811U.

The adjustment assembly 300 includes a fixture 310, an elastic abutment ring 330, and an adjustment member 320. The fixing piece 310 is fixedly disposed at the end of the previous sleeve 100, and may be fixedly disposed on the previous sleeve 100 by means of bolts, adhesion, clamping, etc., which is not limited thereto; further, at least a portion of the securing member 310 protrudes axially beyond the end of the sleeve 100.

The abutment ring 330 is made of an elastic material, including but not limited to plastic, silicone, etc., such that when the abutment ring 330 is pressed, it is capable of deforming; the abutment ring 330 is clamped between the inner sidewall of the previous ferrule 100 and the outer sidewall of the subsequent ferrule 100, specifically, a portion thereof protrudes from the previous ferrule 100 and is fixed by the fixing member 310, and at the same time, a tapered surface is formed on the bottom circumferential surface of the abutment ring 330.

The adjusting piece 320 is movably arranged on the fixing piece 310 along the axial direction, and can move on the fixing piece 310 along the axial direction; for example, the adjusting member 320 may be coupled to the fixing member 310 by a bolt, the axial position of the adjusting member 320 on the fixing member 310 may be adjusted by tightening or loosening the bolt, or the adjusting member 320 may be directly screw-coupled to the fixing member 310, and the axial position of the adjusting member 320 on the fixing member 310 may be adjusted by rotating the adjusting member 320. The surface of the adjusting member 320 opposite to the abutment ring 330 is formed with a bevel, which can be matched with the tapered surface of the abutment ring 330, and when the adjusting member 320 moves axially on the fixing member 310, the bevel on the adjusting member 320 moves to an axial position different from the tapered surface of the abutment ring 330, so as to squeeze the tapered surface, so that the tapered surface of the abutment ring 330 is radially contracted and deformed under the squeezing to reduce the gap between the tapered surface and the subsequent sleeve 100.

By providing the adjustment assembly 300 between two adjacent sections of the sleeve 100, compensation for a larger gap between two adjacent sections of the sleeve 100 due to production manufacturing or assembly processes can be achieved.

Specifically, if the clearance between two adjacent sections of the sleeves 100 is found to be sufficient to affect the stability of the fully extended telescopic tube structure after the telescopic tube structure is assembled, the adjusting member 320 can be adjusted to move to different axial positions on the fixing member 310, so that the inclined surface on the adjusting member 320 presses the conical surface on the abutting ring 330, and further the end of the abutting ring 330 provided with the conical surface is contracted along the radial direction to compensate the clearance between the abutting ring and the subsequent sleeve 100, and it is to be understood that even though the compensating adjustment is performed, a small clearance still exists between the abutting ring 330 and the subsequent sleeve 100, so that the subsequent sleeve 100 can slide smoothly.

Referring to fig. 1 and 2, in some embodiments, the aforementioned abutment ring 330 is fixed by the fixing member 310, and specifically, a flange 331 is provided on an outer peripheral wall of the abutment ring 330 in a circumferential direction; a stopper 311 for restricting the flange 331 is provided on the inner sidewall of the holder 310 in the circumferential direction. Specifically, the above-mentioned limiting portion 311 is a step portion, a groove for accommodating the flange 331 is formed between the step portion and the end surface of the previous sleeve 100, and when the abutment ring 330 is clamped between the two sleeves 100 and the flange 331 is accommodated in the groove, the axial position of the abutment ring 330 is fixed.

It should be understood that the fixing member 310 may be a plurality of single members arranged in a circumferential array and fixed on the sleeve 100, or may be a ring member, which is not limited thereto.

Referring to fig. 1 and 2, further, in some embodiments, the adjusting member 320 is a ring body and is screwed with one end of the fixing member 310, and a slope is formed on an inner circumferential wall of the adjusting member 320. It will be appreciated that in this embodiment, the fixing member 310 is preferably a ring body, so that the adjustment of the gap between the abutment ring 330 and the subsequent sleeve 100 can be achieved by rotating the adjusting member 320 to move to different axial positions on the fixing member 310.

Referring to fig. 3 and 4, it can be appreciated that the locking assembly 200 includes the fixing base 210, the key cylinder 220, the driving member 230, the locking member 240, and the driving lever 250 on the basis of the above embodiments. Specifically, the fixing base 210 is fixedly disposed at an end of the latter sleeve 100, the lock cylinder 220 is rotatably disposed at the fixing base 210 and is fixedly sleeved on the outer side of the driving rod 250 in the circumferential direction, the driving member 230 is in threaded connection with the outer circumferential surface of the lock cylinder 220 and is fixedly disposed in the circumferential direction, the locking member 240 is connected with the driving member 230, and the locking member 240 can be driven by the driving member 230 to abut against or release the inner side wall of the sleeve 100.

It should be understood that, in the case that the sleeve 100 is provided with two or more sections, for example, three sections, four sections, etc., each locking assembly 200 includes one section of driving rod 250, the driving rods 250 on two adjacent locking assemblies 200 are sleeved with each other and slidably disposed along the axial direction, and the driving rods 250 are fixedly disposed with respect to each other in the circumferential direction so as to be capable of rotating synchronously, and at the same time, the driving rods 250 on the latter locking assemblies 200 are fixedly disposed with respect to the former sleeve 100.

In addition, it should be understood that the following several embodiments of the locking member 240 are possible.

In some embodiments, retaining member 240 is fixedly positioned in an axial position, while the opposing faces of retaining member 240 and driving member 230 are beveled, such that when driving member 230 moves axially, the respective beveled faces of retaining member 240 and driving member 230 cooperate with each other to enable driving member 230 to push retaining member 240 radially against the inside wall of sleeve 100.

Referring to fig. 3 and 4, in other embodiments, the locking member 240 includes several components, for example, a guide ring 241 formed with a tapered surface, a fixed ring 242 provided with a movable groove 2421 along the circumferential direction, and a ball 243 rollably disposed in the movable groove 2421, in such embodiments, the driving member 230 is a ring body, the fixed ring 242 is disposed on the driving member 230, when the fixed ring 242 is driven by the driving member 230 to move along the axial direction, the fixed ring 242 drives the ball 243 to move along the axial direction, during the process of moving the ball 243 along the axial direction, the ball 243 can contact with different axial positions on the guide ring 241, and when the ball 243 moves to the bottommost end of the guide ring 241, the ball 243 can simultaneously abut against the inner sidewall of the sleeve 100 and the guide ring 241, thereby realizing locking of the sleeve 100.

By fixing the key cylinder 220 to the driving lever 250 in the circumferential direction, it is possible to synchronize rotation of the key cylinder 220 with the driving lever 250 when the driving lever 250 rotates; further, the driver 230 is screwed to the outer peripheral surface of the key cylinder 220 and is fixedly disposed in the circumferential direction. Thus, when the driving rod 250 rotates the lock cylinder 220, the driving member 230 can move axially under the driving of the screw to drive the locking member 240 to abut against or release the inner sidewall of the sleeve 100.

Referring to fig. 3 and 4, in some embodiments, driver 230 and lock 240 are symmetrically disposed in the axial direction of lock cylinder 220 with the threads on both drivers 230 being in opposite directions. Thus, when the key cylinder 220 rotates along with the driving rod 250, the key cylinder 220 can synchronously drive the two driving members 230 to move in opposite directions, so as to drive the two locking members 240 to synchronously lock or release the inner side wall of the sleeve 100, thereby improving the locking or releasing efficiency and stability.

Referring to fig. 3 and 4, in some embodiments, the fixing rings 242 are movably sleeved outside the driving member 230, and a spring 260 is sleeved between the two fixing rings 242. Thus, the fixing ring 242 is movably sleeved, so that the locking assembly 200 can be conveniently assembled; and a spring 260 is sleeved between the two fixing rings 242, so that the fixing rings 242 can be abutted against the driving piece 230 through elasticity, and a good locking and retaining effect is realized.

Referring to fig. 3 and 4, in some embodiments, a rolling member 270 is provided on top of lock cylinder 220, rolling member 270 being in rolling contact with the outer sidewall of drive rod 250; further, a flat surface is formed on the peripheral wall of the drive lever 250 in the axial direction, and the flat surface is in rolling contact with the rolling member 270. Specifically, the rolling member 270 includes a cage fixedly disposed on the top of the key cylinder 220 and rolling bodies rotatably disposed on the cage, and the rolling bodies are disposed on opposite sides of the cage, and the rolling bodies may be bearings. By providing the rolling member 270 in this manner, the telescoping stability of the telescoping tube structure can be improved when the key cylinder 220 slides relative to the drive rod 250.

It can be appreciated that, as can be seen from the foregoing, the lock cylinder 220 is fixedly sleeved on the outer side of the driving rod 250 in the circumferential direction, and meanwhile, the lock cylinder 220 is rotatably inserted in the fixing base 210, specifically, a through hole is axially and penetratingly provided in the fixing base 210, and the lock cylinder 220 is inserted in the through hole. Because lock cylinder 220 is required to rotate relative to holder 210, a gap exists between it and the through hole in holder 210, which can affect the stability of the overall telescoping tube structure after each sleeve 100 is fully extended on the telescoping tube structure.

Based on this, to improve stability of the telescopic tube structure after the sleeves 100 are fully extended, and reduce occurrence of shaking of the sleeves 100, referring to fig. 3 and 4, in some embodiments, the locking assembly 200 is configured as follows: a first bearing 410 is sleeved on the bottom circumferential surface of the lock cylinder 220; an adjusting piece 320 is connected to the bottom end of the lock cylinder 220 in a threaded manner, the adjusting piece 320 can push the first bearing 410 to move on the outer peripheral wall of the lock cylinder 220 in the axial direction, and the limiting of the axial position of the first bearing 410 is achieved through the limiting of the adjusting piece 320, so that the limiting of the radial position of the lock cylinder 220 is achieved.

It should be appreciated that the interference fit between the inner peripheral wall of the first bearing 410 and the outer peripheral wall of the key cylinder 220, but the maximum static friction between the two is less than the thrust of the adjuster 320 against the first bearing 410 under the drive of the screw.

Specifically, the adjustment process of the first bearing 410 by the adjustment member 320 is as follows: the circumferential direction and the axial direction of the lock cylinder 220 are fixed by a tool, the adjusting piece 320 is rotated, so that the adjusting piece 320 moves along the axial direction of the lock cylinder 220 to push the first bearing 410 to move along the axial direction until the top end peripheral surface of the first bearing 410 abuts against the fixing seat 210, at this time, since the top end surface and the bottom end surface of the first bearing 410 are limited, and the inner peripheral surface of the first bearing 410 is in interference fit with the outer peripheral surface of the lock cylinder 220, the first bearing 410 can fix the lock cylinder 220 in the axial direction without shaking and inclination deviating from the axial direction.

It should be understood that the adjustment of the position of the first bearing 410 by the adjusting member 320 is generally performed before the telescopic tube structure leaves the factory, and after the lock cylinder 220 is adjusted so as not to shake relative to the fixing base 210, an adhesive can be applied between the adjusting member 320 and the fixing base 210 to fix the relative positions of the two, so as to prevent the adjusting member 320 from loosening. In some embodiments, the adhesive may be glue.

It will be appreciated that, in the above-mentioned first bearing 410, in a further embodiment, the shoulder 211 is formed on the peripheral surface of the lock cylinder 220, and the second bearing 420 with an upper end surface abutting against the shoulder 211 is sleeved on the peripheral surface of the lock cylinder 220, and a lower end surface of the second bearing 420 can abut against an upper end surface of the fixing base 210.

Likewise, the interference fit between the inner peripheral wall of second bearing 420 and the outer peripheral wall of lock cylinder 220 is such that the maximum static friction between the two is less than the thrust of lock cylinder 220 against second bearing 420 under the drive of the threads.

In this embodiment, the adjustment process of the first bearing 410 and the second bearing 420 by the adjuster 320 is as follows: the adjusting member 320 is rotated so that the adjusting member 320 and the lock cylinder 220 move relatively in the axial direction, and after the adjusting member 320 limits the first bearing 410 between the adjusting member 320 and the fixing base 210, the adjusting member 320 is continuously rotated so that the lock cylinder 220 moves in the axial direction, and in the process, the shoulder 211 on the lock cylinder 220 pushes the second bearing 420 to slide in the direction approaching the fixing base 210 until the bottom end surface of the second bearing 420 abuts against the upper end surface of the fixing base 210.

When the second bearing 420 is limited to the shoulder 211 and the upper end surface of the fixing base 210, for the lock cylinder 220, it is fixed by two radial fixing points (i.e. the first bearing 410 and the second bearing 420) in the axial direction, so that the stability of the second bearing in the radial direction can be further improved, and after each sleeve 100 in the telescopic tube structure is fully extended, the overall stability of the telescopic tube structure can be better improved.

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

Claims (10)

1. A telescopic tube structure, comprising:

at least two sections of sleeves which are sleeved with each other and can slide along the axial direction;

the locking component is arranged in the hollow interior of the sleeve and positioned between two adjacent sections of the sleeve and is used for locking or releasing the two adjacent sections of the sleeve;

the adjusting assembly comprises a fixing piece, an elastic abutting ring and an adjusting piece; the fixing piece is fixedly arranged at the end part of the previous sleeve; the abutting ring is clamped between the inner side wall and the outer side wall of two adjacent sections of sleeves and is axially fixed by the fixing piece, and a conical surface is formed on the outer peripheral surface of the bottom end of the abutting ring; the adjusting piece is movably arranged on the fixing piece along the axial direction, an inclined surface is formed on one surface of the adjusting piece, which is opposite to the abutting ring, and when the adjusting piece moves along the axial direction, the inclined surface extrudes the conical surface so as to reduce the gap between the abutting ring and the subsequent sleeve.

2. A telescopic tube structure according to claim 1, wherein: a flange is arranged on the outer peripheral wall of the abutting ring along the circumferential direction; and a limiting part for limiting the flange is arranged on the inner side wall of the fixing piece along the circumferential direction.

3. A telescopic tube structure according to claim 2, wherein: the adjusting piece is a ring body and is in threaded connection with one end of the fixing piece, and the inclined plane is formed on the inner side peripheral wall of the adjusting piece.

4. A telescopic tube structure according to any one of claims 1 to 3, wherein: the locking assembly comprises a fixed seat, a lock cylinder, a driving piece, a locking piece and a driving rod; the fixed seat is fixedly arranged at the end part of the latter sleeve, the lock cylinder is rotatably arranged on the fixed seat and fixedly sleeved on the outer side of the driving rod in the circumferential direction, and the driving piece is in threaded connection with the outer circumferential surface of the lock cylinder and fixedly arranged in the circumferential direction; when the lock core rotates along with the driving rod, the driving piece moves axially under the driving of the threads so as to drive the locking piece to abut against or release the inner side wall of the sleeve.

5. A telescopic tube structure according to claim 4, wherein: a first bearing is sleeved on the circumferential surface of the bottom end of the lock cylinder; an adjusting piece is connected with the bottom end of the lock cylinder in a threaded manner; the end surfaces of the two sides of the first bearing are respectively abutted against the fixing seat and the adjusting piece.

6. A telescopic tube structure according to claim 5, wherein: the lock cylinder is characterized in that a shaft shoulder is formed on the peripheral surface of the lock cylinder, a second bearing with the upper end face abutting against the shaft shoulder is sleeved on the peripheral surface of the lock cylinder, and the lower end face of the second bearing can abut against the upper end face of the fixing seat.

7. A telescopic tube structure according to claim 4, wherein: the driving piece is a ring body in threaded connection with the lock cylinder; the locking piece comprises a guide ring, a fixed ring and rolling balls, wherein the guide ring is provided with a conical surface, the fixed ring is provided with a movable groove along the circumferential direction, the rolling balls are arranged in the movable groove, the fixed ring is arranged on the driving piece, and the rolling balls can abut against the inner side wall of the sleeve under the extrusion of the conical surface.

8. A telescopic tube structure according to claim 7, wherein: the driving piece and the locking piece are symmetrically arranged in the axial direction of the lock cylinder, and the directions of threads on the driving pieces are opposite.

9. A telescopic tube structure according to claim 8, wherein: the fixed rings are sleeved on the outer sides of the driving parts, and springs are sleeved between the two fixed rings.

10. A telescopic tube structure according to claim 4, wherein: the top of the lock cylinder is provided with a rolling piece, and the rolling piece is in rolling contact with the outer side wall of the driving rod.