CN218030968U - Telescopic positioning device - Google Patents

Abstract

The utility model relates to a flexible location utensil, include: a housing base; the locking block is fixedly arranged on the shell seat and provided with a locking part, and the locking part has an unlocking state and a locking state; the control ring is movably sleeved on the locking block; the elastic piece is abutted between the locking block and the control ring; the core rod is arranged in the locking block and the shell seat in a telescopic and movable manner and is provided with a locking matching part; when the control ring is pushed towards the direction of the locking block, the elastic piece is compressed, the locking part and the locking matching part are separated at the moment and are in an unlocking state, and when the control ring is released, the elastic piece pushes the control ring to press the locking part so as to force the locking part and the locking matching part to be in locking state in locking matching. The operation labour saving and time saving, it is efficient, simple structure simultaneously can effectively reduce manufacturing and use cost, and is low to waterproof dustproof requirement, and the reliability is high.

Description

Telescopic positioning device

Technical Field

The utility model relates to an auxiliary positioning equipment technical field especially relates to a flexible location utensil.

Background

In many technical fields, when two parts with mutual linear motion or rotation motion are required to be positioned at a specific distance or a specific angle position, telescopic positioning devices are required, for example, a common telescopic positioning device is a one-way pull rod.

At present, most of the one-way pull rods on the market adopt a screw rod or an electro-hydraulic driving module to realize the purposes of length adjustment and positioning after the length is adjusted to the required length, and the manual rotation of the screw rod not only wastes time and labor in operation, but also has low efficiency; the scheme of adopting the electro-hydraulic drive module has the defects of high manufacturing and using cost, redundant functions and high requirements on water resistance and dust resistance.

SUMMERY OF THE UTILITY MODEL

Therefore, a telescopic positioning device is needed to be provided, and the problems that the adjustment operation in the prior art is time-consuming and labor-consuming, the manufacturing and using costs are high, and the using reliability is poor are solved.

The application provides a flexible positioning apparatus, it includes:

a housing base;

the locking block is fixedly arranged on the shell seat and provided with a locking part, and the locking part has an unlocking state and a locking state;

the control ring is movably sleeved on the locking block;

the elastic piece is abutted between the locking block and the control ring; and

the core bar is arranged in the locking block and the shell seat in a telescopic and movable manner and is provided with a locking matching part;

when the control ring is pushed towards the direction of the locking block, the elastic piece is compressed, the locking part and the locking matching part are separated to be in an unlocking state, and when the control ring is released, the elastic piece pushes the control ring to press the locking part so as to force the locking part and the locking matching part to be in locking matching to be in a locking state.

The telescopic positioning device is applied between two components with relative linear motion or rotary motion, and can fix the functions of the two components at the current position after completely adjusting the distance or the angle of the two components according to requirements. Specifically, the length of the telescopic positioning device is used to determine the distance or angle between the two members, and the length of the telescopic positioning device is determined by the telescopic movement of the core rod and the housing base. Under the normal use state, the control ring has the momentum of moving towards the latch fitting part direction of latch fitting piece owing to receive the elastic thrust of elastic component, and control ring just can extrude latch fitting part thereby compel latch fitting part and the latch fitting part of core bar to lock at this moment, and the core bar just can't carry out telescopic movement relative to the shell seat, and the length of flexible positioning utensil just can be fixed at the required value after the adjustment this moment, obtains the distance or the angle of required two parts promptly. When the distance or the angle of the two components needs to be adjusted again, the control ring is manually pushed to move towards the direction far away from the locking part, the control ring is separated from the locking part while compressing the elastic piece, at the moment, the locking part can be separated from the locking matching part due to the fact that the locking part is not subjected to extrusion force applied by the control ring any more, the core rod is unlocked and is in an unlocking state, at the moment, the core rod can stretch and move relative to the shell base to achieve the purpose of adjusting the length of the telescopic positioning appliance, namely, the effect of adjusting the distance value or the angle of the two components is achieved, then the control ring is loosened, and the control ring can automatically extrude the locking part and lock the locking matching part again under the action of the elastic piece releasing elastic thrust force, so that the telescopic positioning appliance is fixed. Compared with the mode of adopting a lead screw or an electro-hydraulic driving module in the prior art, the core rod can be unlocked only by manually pushing the control ring when the adjustment operation is carried out, the relative telescopic movement of the core rod and the shell seat is realized, the telescopic positioning device can enter a locking state by loosening the control ring after the adjustment is completed, the operation is time-saving and labor-saving, the efficiency is high, the structure is simple, the manufacturing and using cost can be effectively reduced, the requirement on water resistance and dust resistance is low, and the reliability is high.

The technical scheme of the application is further explained as follows:

in one embodiment, the control ring comprises a ring body, an avoiding groove is formed in the inner annular wall of the ring body, the locking portion comprises a locking arm, an anti-falling clamping protrusion is arranged on the outer wall of the locking arm, and the anti-falling clamping protrusion can be slidably mounted in the avoiding groove to enable the control ring to be sleeved outside the locking block.

In one embodiment, the ring body is further provided with a pressing part arranged along the circumferential direction with the avoiding groove, when the control ring is sleeved outside the locking block and rotates for a preset angle along the circumferential direction, the avoiding groove and the anti-falling block protrusion are staggered in the circumferential direction, and the pressing part and the anti-falling block protrusion are axially aligned.

In one embodiment, an inclined plane portion is disposed on an outer wall of the locking arm, the locking arm is provided with a locking hook, the locking matching portion includes a hook groove, when the control ring slides against the inclined plane portion, the locking arm is pressed to deform and rotate towards the core rod, and the locking hook is hooked in the hook groove.

In one embodiment, the number of the hook grooves is at least two, and the at least two hook grooves are arranged at intervals along the axial direction of the core rod; and/or

The hook groove is of a circular structure.

In one embodiment, the control ring further comprises a force applying body, the force applying body is connected to one end of the ring body, which is far away from the anti-falling clamp protrusion, and the outer wall of the force applying body is provided with a conical surface.

In one embodiment, the control ring further comprises a claw, the locking block further comprises a main body part connected with the locking part, one end, far away from the locking part, of the main body part is provided with a through groove and a limiting protrusion along the circumferential direction, the claw can penetrate through the through groove, and after the control ring rotates relative to the locking block by a preset angle, the claw is fastened and fixed with the limiting protrusion, and at the moment, the telescopic positioning device is in a non-locking state.

In one embodiment, the main body portion is provided with a first connecting portion, the housing base is provided with a second connecting portion, and the first connecting portion and the second connecting portion are directly or indirectly connected to connect and fix the locking block and the housing base.

In one embodiment, one end of the shell seat far away from the locking block is provided with a first mounting part.

In one embodiment, one end of the core rod, which extends out of the locking block, is provided with a second mounting part.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the assembly of the telescopic positioning apparatus with a first member and a second member according to the present application;

FIG. 2 is a schematic view of the assembled structure of the telescopic positioning device of the present application;

FIG. 3 is a schematic axial cross-sectional view of FIG. 2;

fig. 4 is a schematic diagram of the exploded structure of fig. 2.

Description of the reference numerals:

100. a telescopic positioning device; 10. a housing base; 11. a second connecting portion; 12. a first mounting portion; 20. a locking block; 21. a locking part; 211. a locking arm; 211a, a slope portion; 211b, a latch hook; 212. the anti-falling clamp is convex; 22. a main body part; 221. passing through a groove; 222. a limiting bulge; 223. a first connection portion; 30. a control loop; 31. a ring body; 311. an avoidance groove; 312. a pressing part; 32. a force application body; 321. a conical surface; 33. a jaw; 40. an elastic member; 50. a core bar; 51. a locking engagement portion; 511. a hook groove; 52. a second mounting portion; 200. a first member; 300. a second component.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As shown in fig. 1, a telescopic positioning device 100 is shown for an embodiment of the present application, which has a length telescopic adjustment capability and is applied to an application where two members (specifically, a first member 200 and a second member 300) having a mutual linear motion or a rotational motion need to be positioned at a specific distance or a specific angular position. For example, the telescopic positioning instrument 100 may be a one-way pull rod.

With continued reference to fig. 2-4, in particular, the retractable positioning device 100 includes: shell seat 10, locking piece 20, control ring 30, elastic member 40 and core rod 50. The housing 10 is a bearing body for mounting the fixed locking block 20, the control ring 30, the elastic member 40 and the core rod 50. In this embodiment, the housing 10 is a hollow circular tube, and the cavity of the hollow circular tube is used for inserting the movable core rod 50, it can be understood that the core rod 50 is a circular rod, and the total length of the core rod 50 and the housing 10 after being extended determines the length of the telescopic positioning device 100, so as to fix the distance or angle between the two components.

In use, the housing 10 is fixedly connected to one of the two members (e.g., the first member 200 or the second member 300), and the core pin 50 is fixedly connected to the other of the two members (e.g., the first member 200 or the second member 300).

For example, in some embodiments, the end of the housing base 10 remote from the locking block 20 is provided with a first mounting portion 12. The core rod 50 is provided with a second mounting portion 52 at one end extending out of the locking block 20. Therefore, the housing 10 can be quickly and firmly assembled and fixed with one of the components through the first mounting portion 12, and the core bar 50 can be quickly and firmly assembled and fixed with the other component through the second mounting portion 52. Specifically, the first mounting portion 12 and the second mounting portion 52 are both provided with through holes or threaded holes, and the shell base 10 and the core bar 50 can be screwed and fixed with corresponding components by adopting threaded connection components, so that the connection mode is simple, and the reliability is good.

Of course, in other embodiments, the first mounting portion 12 and the second mounting portion 52 may also be an adhesive member, a snap member, a magnetic member, etc., so that the shell base 10 and the core rod 50 are assembled and connected with the corresponding components by adhesion, snapping, magnetic connection, etc.

The locking block 20 is fixedly arranged on the shell base 10, the locking block 20 is provided with a locking part 21, and the locking part 21 has an unlocking state and a locking state. In particular, the locking block 20 is immovable after being mounted on the housing 10, so that the interference to the working state of the locking part 21 can be avoided. The locking block 20 is installed by being sleeved on the outside of the housing base 10. The locking block 20 is a cylindrical structure with two ends penetrating through, wherein one end is open to allow the locking block to be smoothly sleeved on the housing 10, and the other end allows the core rod 50 to smoothly penetrate through and be connected with a corresponding component.

With reference to fig. 4, in some embodiments, the locking block 20 further includes a main body 22 connected to the locking portion 21, the main body 22 has a first connecting portion 223, the housing 10 has a second connecting portion 11, and the first connecting portion 223 is directly or indirectly connected to the second connecting portion 11 to connect and fix the locking block 20 and the housing 10. For example, the first connecting portion 223 is a threaded hole, the second connecting portion 11 is a through hole, and the locking piece 20 and the housing 10 can be assembled and fixed by screwing a screw connecting member such as a screw into the threaded hole after passing through the through hole. The connection mode is simple, and the connection reliability is high.

Of course, in other embodiments, the first connection portion 223 and the second connection portion 11 may also be connected by a snap, an adhesive, a magnetic attraction, or the like, and specifically, the selection may be performed according to actual needs.

The control ring 30 is movably sleeved on the locking block 20. In particular, the control ring 30 can slide axially relative to the locking piece 20.

The elastic member 40 abuts between the locking block 20 and the control ring 30; the core bar 50 is telescopically arranged inside the locking block 20 and the shell base 10, and the core bar 50 is provided with a locking matching part 51; when the control ring 30 is pushed toward the locking block 20, the elastic member 40 is compressed, and the locking portion 21 is separated from the locking engagement portion 51 to be in an unlocked state, and when the control ring 30 is released, the elastic member 40 pushes the control ring 30 to press the locking portion 21 to force the locking portion 21 to be in locking engagement with the locking engagement portion 51 to be in a locked state.

Alternatively, the elastic element 40 may be, but is not limited to, any one of a spring, an elastic column, an elastic sleeve, and the like, and in this embodiment, the elastic element 40 is specifically a spring.

In summary, the implementation of the technical solution of the present embodiment has the following beneficial effects: the telescopic positioning device 100 of the above-mentioned solution is applied to be equipped between two components with relative linear motion or rotational motion, and can fix the function of the two components at the current position after completely adjusting the distance or angle of the two components as required. Specifically, the length of the telescopic positioning tool 100 is used to determine the distance or angle between the two members, and the length of the telescopic positioning tool 100 is determined by the telescopic movement of the stem 50 and the housing 10.

Under normal use condition, the control ring 30 is forced to move towards the locking part 21 of the locking block 20 by the elastic thrust of the elastic member 40, at this time, the control ring 30 will press the locking part 21 to force the locking part 21 to lock with the locking matching part 51 of the core rod 50, the core rod 50 cannot move telescopically relative to the housing 10, at this time, the length of the telescopic positioning apparatus 100 will be fixed at the adjusted required value, i.e. the required distance or angle between the two components is obtained. When the distance or angle between the two components needs to be adjusted again, the control ring 30 is manually pushed to move in the direction away from the locking portion 21, the control ring 30 is separated from the locking portion 21 while compressing the elastic member 40, at this time, the locking portion 21 can be separated from the locking mating portion 51 because of no extrusion force applied by the control ring 30, the core bar 50 is unlocked and in an unlocked state, at this time, the core bar 50 can perform telescopic movement relative to the housing 10 to achieve the purpose of adjusting the length of the telescopic positioning apparatus 100, that is, to achieve the effect of adjusting the distance or angle between the two components, then the control ring 30 is released, and the control ring 30 can automatically extrude the locking portion 21 and the locking mating portion 51 again to be locked under the action of the elastic member 40 releasing the elastic thrust, so that the telescopic positioning apparatus 100 is fixed.

Compared with the mode of adopting a lead screw or an electro-hydraulic driving module in the prior art, the core rod 50 can be unlocked only by manually pushing the control ring 30 during the adjustment operation, the relative telescopic movement of the core rod 50 and the shell seat 10 is realized, the telescopic positioning appliance 100 can enter a locking state by loosening the control ring 30 after the adjustment is completed, the operation is time-saving and labor-saving, the efficiency is high, meanwhile, the structure is simple, the manufacturing and using cost can be effectively reduced, the requirement on water resistance and dust resistance is low, and the reliability is high.

In some embodiments, the control ring 30 includes a ring body 31, and the ring body 31 is a solid cylindrical structure. The inner annular wall of the ring body 31 is provided with an avoiding groove 311, and the avoiding groove 311 is specifically formed at one end of the ring body 31 facing the locking part 21.

The locking portion 21 includes the locking arm 211, and the one end of locking arm 211 sets up on main part 22, and the other end is unsettled form setting, and this kind of mounting structure makes locking arm 211 possess elastic deformation ability, also possesses locking arm 211 and be close to or keep away from core bar 50 under the certain degree the outer wall of locking arm 211 is equipped with anticreep card protruding 212, anticreep card protruding 212 can with dodge groove 311 slidable mounting so that control ring 30 can locate the outside of locking piece 20. When the locking ring is mounted, the locking projection 212 is aligned with the escape groove 311, and the control ring 30 is slidably mounted on the outside of the body 22 of the locking block 20.

The locking arm 211 is inclined in the non-stressed state, specifically, inclined outward in the direction away from the core rod 50, such a design not only forms a sufficient and necessary gap between the locking arm 211 and the core rod 50 to ensure the normal deformation of the locking arm 211, but also can prevent the control ring 30 from being removed after the control ring 30 is sleeved on the locking block 20.

With reference to fig. 4, in addition to the above embodiment, the ring body 31 is further provided with pressing portions 312 arranged along the circumferential direction with the avoiding groove 311, when the control ring 30 is sleeved outside the locking block 20 and rotates by a preset angle along the circumferential direction, the avoiding groove 311 and the anti-releasing protrusion 212 are dislocated in the circumferential direction, and the pressing portions 312 and the anti-releasing protrusion 212 are axially aligned. At this time, the avoiding groove 311 is dislocated from the anti-separation protrusion 212, and the pressing portion 312 is aligned with the anti-separation protrusion 212, so that the control ring 30 is not separated after being mounted on the locking block 20. Meanwhile, under the elastic thrust of the elastic member 40, the control ring 30 can slide to the outside of the locking arm 211 by the pressing portion 312, so that the locking arm 211 is pressed to deform, the locking arm 211 is locked with the locking matching portion 51, and the anti-disengaging protrusion 212 can abut against the pressing portion 312 to limit the movement of the control ring 30.

Preferably, the locking arm 211, the avoiding groove 311 and the pressing portion 312 are two or more and are disposed in a one-to-one corresponding manner. At this time, two or more of the locking arms 211 are arranged at intervals in the circumferential direction, and a gap between two adjacent locking arms 211 is formed as a deformation joint, so that mutual interference between the locking arms 211 in switching between the locking state and the unlocking state is avoided. When the locking device is used, at least two pressing parts 312 synchronously press or release the locking arm 211, so that the action consistency of the locking arm 211 is good, and the locking or unlocking of the core rod 50 is reliable.

With reference to fig. 2 and fig. 3, in further another embodiment, an inclined surface portion 211a is disposed on an outer wall of the locking arm 211, the locking arm 211 is provided with a locking hook 211b, the locking mating portion 51 includes a hook slot 511, when the control ring 30 slides and presses against the inclined surface portion 211a, the locking arm 211 is pressed to deform and rotate toward the stem 50, and the locking hook 211b is hooked in the hook slot 511. The pressing portion 312 is in sliding contact with the inclined surface portion 211a to force the locking arm 211 to deform and rotate toward the core rod 50, so that the locking hook 211b is hooked in the groove on the outer wall of the core rod 50, and the core rod 50 is locked and cannot freely stretch, thereby achieving the effect of fixing the length of the telescopic positioning device 100 and the distance or angle between the two components. And the locking structure of the locking hook 211b and the hook groove 511 is adopted, so that the bearable reverse acting force is large, the locking capability is strong, and the positioning effect of the two parts is not influenced by the slippage phenomenon easily.

Preferably, the hook slot 511 has a circular ring structure. Therefore, after the core rod 50 rotates at any angle, the locking hook 211b can be smoothly hooked and connected with the hook groove 511, the alignment step is omitted, and the connection difficulty is reduced.

On the basis of the above embodiment, the hook grooves 511 are provided in at least two, and at least two hook grooves 511 are arranged at intervals along the axial direction of the core rod 50. After the core bar 50 is telescopically moved, a hook slot 511 is always opposite to the hook 211b, so that the locking block 20 can be locked with the core bar 50 when the core bar is telescopically adjusted to any length.

As can be easily understood, by examining the minimum groove width of the groove and the interval value between two adjacent grooves, the minimum adjusting distance of the telescopic positioning device 100 can be adjusted, and the adjusting precision is improved.

In addition, on the basis of any of the above embodiments, the control ring 30 further includes a force applying body 32, the force applying body 32 is connected to one end of the ring body 31 far away from the anti-separation protrusion 212, and an outer wall of the force applying body 32 is provided with a tapered surface 321. Thus, the user can push the control ring 30 more effectively by applying force to the tapered surface 321 of the force applying body 32 with his hand, thereby improving the operation effectiveness and the experience. Specifically, the force applying body 32 is an annular cone-shaped cylindrical structure, and one end of the force applying body is integrally or detachably connected with the ring body 31, and the force applying body and the ring body are coaxially arranged.

Further, on the basis of the above embodiment, the control ring 30 further comprises a claw 33, the claw 33 is in an L-like hook shape, and the free end of the long rod part of the claw 33 is fixedly connected with the end of the force applying body 32 far away from the ring body 31.

The locking block 20 further includes a main body 22 connected to the locking portion 21, a through groove 221 and a limiting protrusion 222 are circumferentially disposed at one end of the main body 22 away from the locking portion 21, the claw 33 can pass through the through groove 221, and after the control ring 30 rotates by a preset angle relative to the locking block 20, the claw 33 is fastened and fixed to the limiting protrusion 222, and at this time, the telescopic positioning device 100 is in a non-locking state. Thus, the claw 33 is fastened and fixed with the limiting protrusion 222, that is, the control ring 30 can be connected and fixed with the locking block 20, at the moment, the control ring 30 can be ensured to be always separated from the contact locking arm 211, the locking arm 211 and the core rod 50 are kept in an unlocking state, and the two parts are kept in a movable connection state, so that continuous distance or angle adjustment can be carried out.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A telescopic positioning apparatus, comprising:

a housing base;

the locking block is fixedly arranged on the shell seat and provided with a locking part, and the locking part has an unlocking state and a locking state;

the control ring is movably sleeved on the locking block;

the elastic piece is abutted between the locking block and the control ring; and

the core bar is arranged in the locking block and the shell seat in a telescopic and movable manner and is provided with a locking matching part;

when the control ring is pushed towards the direction of the locking block, the elastic piece is compressed, the locking part and the locking matching part are separated to be in an unlocking state, and when the control ring is released, the elastic piece pushes the control ring to press the locking part so as to force the locking part and the locking matching part to be in locking matching to be in a locking state.

2. The telescopic positioning device as claimed in claim 1, wherein the control ring includes a ring body, an avoiding groove is formed on an inner annular wall of the ring body, the locking portion includes a locking arm, an anti-releasing protrusion is formed on an outer wall of the locking arm, and the anti-releasing protrusion can be slidably mounted on the avoiding groove to enable the control ring to be sleeved on the outside of the locking block.

3. The telescopic positioning device of claim 2, wherein the ring body further has a pressing portion circumferentially arranged with the avoiding groove, and when the control ring is sleeved outside the locking block and rotated in a circumferential direction by a predetermined angle, the avoiding groove and the anti-releasing protrusion are circumferentially misaligned, and the pressing portion and the anti-releasing protrusion are axially aligned.

4. The telescopic positioning device as claimed in claim 2, wherein the outer wall of the locking arm has a slope portion, and the locking arm has a locking hook, the locking engagement portion includes a hook groove, when the control ring slides against the slope portion, the locking arm is pressed to deform and rotate toward the stem, and the locking hook is hooked in the hook groove.

5. The telescopic positioning apparatus according to claim 4, wherein the number of the hook slots is at least two, and at least two of the hook slots are arranged at intervals along the axial direction of the core rod; and/or

The hook groove is of a circular structure.

6. The telescopic positioning device as claimed in claim 2, wherein the control ring further comprises a force applying body connected to an end of the ring body away from the anti-separation protrusion, and an outer wall of the force applying body is provided with a tapered surface.

7. The telescopic positioning device according to claim 6, wherein the control ring further comprises a claw, the locking block further comprises a main body connected to the locking portion, a through groove and a limiting protrusion are formed in one end of the main body, which is far away from the locking portion, in the circumferential direction, the claw can penetrate through the through groove, and after the control ring rotates relative to the locking block by a preset angle, the claw and the limiting protrusion are fastened and fixed, and at this time, the telescopic positioning device is in a non-locking state.

8. The telescopic positioning apparatus of claim 7, wherein the main body is provided with a first connecting portion, the housing is provided with a second connecting portion, and the first connecting portion and the second connecting portion are directly or indirectly connected to fix the locking block to the housing.

9. The telescopic positioning device of claim 1, wherein a first mounting portion is provided at an end of the housing base away from the locking block.

10. The telescopic positioning apparatus according to claim 1, wherein the end of the core rod extending out of the locking block is provided with a second mounting portion.

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