CN215418132U - Lifting positioning mechanism - Google Patents

Abstract

The utility model provides a lifting positioning mechanism, which comprises a driving piece, a cam and a positioning module, wherein the cam is driven by the driving piece to rotate, the positioning module comprises a lifting block and a positioning claw assembly, the cam is provided with a first curved surface and a second curved surface, the positioning module is pushed by the first curved surface to lift, and the positioning claw assembly is controlled by the second curved surface to open and close; the first curved surface comprises a descending surface, a horizontal surface and an ascending surface which are sequentially connected and are annular, the descending surface, the horizontal surface and the ascending surface are respectively used for pushing the positioning module to descend, keep the height unchanged and ascend, and the second curved surface comprises a first claw opening surface, a claw collecting positioning surface, a second claw opening surface and a claw closing surface which are sequentially connected and are annular. According to the lifting positioning mechanism provided by the utility model, under the combined action of the first curved surface and the second curved surface, the positioning claw assembly realizes the positioning of a product, the position of the product does not need to be adjusted manually, the labor cost is greatly reduced, and the production efficiency is improved.

Description

Lifting positioning mechanism

Technical Field

The utility model belongs to the technical field of semiconductors, and particularly relates to a lifting positioning mechanism.

Background

The existing crystal oscillator and chip assembly scheme specifically comprises: the existing crystal oscillator and the chip are all bulk materials, the chip is assembled on the crystal oscillator under a microscope through manual glue sticking on the crystal oscillator, then the product is transferred to a production line, glue sticking condition detection is carried out by an inspector through the microscope, and finally the product is clamped and positioned on a material tray through a manipulator to carry out the next procedure. The existing dispensing equipment is basically from an import, and a horizontal plane moving mechanism and an image detection device are needed to be adopted at a dispensing position to ensure the dispensing position, so that the cost is improved, and the running speed of the equipment is reduced. Because the whole process needs to artificially correct the position and the angle of the product, and the position accuracy of the chip is difficult to ensure in the operation process, the sticking quality of the product is uneven, and the yield of the product is low.

The positions of the crystal oscillator and the chip are adjusted manually, so that the manual cost is extremely high and the efficiency is low; meanwhile, the pins of the chip are easily damaged by manual operation, the requirement on personnel is high, the assembly effect of each product cannot be guaranteed, the quality of the assembled finished product is difficult to guarantee, and the quality is difficult to monitor and control.

Disclosure of Invention

The embodiment of the utility model aims to provide a lifting positioning mechanism to solve the technical problems of high labor cost and low efficiency caused by the fact that positions of a crystal oscillator and a chip need to be adjusted manually in the prior art.

In order to achieve the purpose, the utility model adopts the technical scheme that: the positioning module comprises a lifting block and a positioning claw assembly arranged on the lifting block, the cam is provided with a first curved surface and a second curved surface, the positioning module is pushed to lift by the first curved surface, and the positioning claw assembly is controlled to be opened and closed by the second curved surface; the first curved surface comprises a descending surface, a horizontal surface and an ascending surface which are sequentially connected and in an annular shape, the descending surface, the horizontal surface and the ascending surface are respectively used for pushing the positioning module to descend, keep the height unchanged and ascend, and the second curved surface comprises a first claw opening surface, a claw folding positioning surface, a second claw opening surface and a claw closing surface which are sequentially connected and in an annular shape; the descending surface is opposite to the first jaw opening surface, the horizontal surface is opposite to the jaw closing positioning surface and the second jaw opening surface, and the ascending surface is opposite to the jaw closing surface.

In one embodiment, the cam is provided with an annular groove, two opposite side walls of the annular groove are both the first curved surfaces, the end part of the lifting block is provided with a first bearing, and the outer ring of the first bearing abuts against the first curved surfaces.

In one embodiment, the positioning claw assembly comprises a lower pressing rod and a plurality of clamping claw units arranged on the periphery of the lower pressing rod, and the lower pressing rod is used for pushing the clamping claw units to swing.

In one embodiment, the clamping jaw unit comprises a swinging claw hinged to the lifting block, a roller arranged on the swinging claw and abutted against the lower pressing rod, and a first elastic piece connected between the lifting block and the swinging claw.

In one embodiment, one end of the lower pressure rod is provided with a second bearing, and the second bearing abuts against the second curved surface.

In one embodiment, the positioning module further includes a sleeve, a second elastic member and a limit pin, the sleeve passes through the lifting block, the lower pressing rod passes through the sleeve, two ends of the second elastic member are respectively elastically connected to the sleeve and the second bearing, the sleeve is provided with a strip-shaped hole, and the limit pin passes through the lifting block and extends into the strip-shaped hole.

In one embodiment, one end of the sleeve is provided with a first limiting boss which extends radially outwards and abuts against the lifting block, the other end of the sleeve is provided with a second limiting boss which extends radially inwards, and the second elastic piece abuts against the second limiting boss.

In one embodiment, the sleeve comprises a pressure spring cushion block and a guide cylinder which are sequentially arranged along the axial direction of the lower pressure rod, the first limiting boss and the second limiting boss are respectively arranged at two ends of the pressure spring cushion block, and the strip-shaped hole is formed in the guide cylinder.

In one embodiment, the lifting and positioning mechanism further comprises a third elastic member, and two ends of the third elastic member are respectively connected to the driving member and the lifting block.

In one embodiment, the lifting positioning mechanism further comprises a sliding block and a sliding rail fixedly arranged, the sliding block is slidably connected to the sliding rail, and the sliding block is fixedly connected with the lifting block.

The lifting positioning mechanism provided by the utility model has the beneficial effects that: compared with the prior art, the lifting positioning mechanism comprises a driving piece, a cam and a positioning module, wherein the positioning module comprises a lifting block and a positioning claw assembly, the positioning module is pushed to lift by a first curved surface of the cam, and the positioning claw assembly is controlled to be opened and closed by a second curved surface of the cam. Because first curved surface includes decline face, horizontal plane and rising face, the second curved surface includes first claw face, receives claw locating surface, second claw face and closes the claw face: when the cam rotates, the descending surface pushes the positioning module to descend, and meanwhile, the positioning claw assembly is gradually opened under the pushing of the first claw opening surface; under the action of a horizontal plane, the positioning module keeps the height unchanged, meanwhile, the positioning claw assembly is firstly pushed by the claw-retracting positioning surface to be gradually closed to enable the positioning claw assembly to be in contact with the edge of a product to be positioned, the product is positioned, and then the positioning claw assembly is gradually opened under the action of the second claw-opening surface to be separated from the product; under the effect of the rising surface, the positioning module rises, and the positioning claw assembly is gradually closed under the effect of the claw closing surface. So, under the combined action of first curved surface and second curved surface, the location claw subassembly realizes the location to the product, need not artifical adjustment product position, has greatly reduced the human cost, has improved production efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions 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 based on these drawings without inventive exercise.

Fig. 1 is a first perspective view of a lifting positioning mechanism according to an embodiment of the present invention;

FIG. 2 is a front view of a cam provided by an embodiment of the present invention;

FIG. 3 is a perspective view of a cam according to an embodiment of the present invention;

fig. 4 is a second perspective view of the lifting and positioning mechanism according to the embodiment of the present invention;

fig. 5 is a three-dimensional structural diagram (with the lifting block removed) of the lifting and positioning mechanism according to the embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-a driving member; 2-a cam; 20-an annular groove; 21-a first curved surface; 211-descending surface; 212-horizontal plane; 213-rising surface; 22-a second curved surface; 221-a first jaw opening surface; 222-a pawl retracting positioning surface; 223-second jaw opening surface; 224-occlusal surfaces; 3-a positioning module; 31-a lifting block; 311-a first bearing; 32-a positioning pawl assembly; 321-a lower pressure lever; 3211-a second bearing; 322-a jaw unit; 3221-oscillating claw; 3222-a roller; 3223-a first resilient member; 323-a second elastic member; 324-a sleeve; 3241-compression spring cushion block; 3242-guiding cylinder; 3243-a first limit boss; 3244-strip shaped holes; 325-a limit pin; 4-a frame; 5-a third elastic member; 6-a fourth elastic member; 7-a slide rail; 8-sliding block.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention 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 merely illustrative of the utility model and are not intended to limit the utility model.

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 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 will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the utility model.

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 implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The lifting and positioning mechanism provided by the embodiment of the utility model will now be described. The lifting positioning mechanism is used for positioning products such as chips, crystal oscillators and the like.

In one embodiment of the present invention, referring to fig. 1 to 3, the lifting positioning mechanism includes a driving member 1, a cam 2 and a positioning module 3, the cam 2 is driven by the driving member 1 to rotate, the driving member 1 can be selected from a motor and other mechanisms capable of outputting a rotational motion, and the positioning module 3 is controlled by the cam 2. The cam 2 has a first curved surface 21 and a second curved surface 22, the positioning module 3 includes a lifting block 31 and a positioning pawl assembly 32, and the positioning pawl assembly 32 is disposed on the lifting block 31. The lifting block 31 is pushed by the first curved surface 21 to lift, when the lifting block 31 lifts along with the change of the first curved surface 21, the positioning pawl assembly 32 lifts along with the lifting block 31, and the positioning pawl assembly 32 is controlled by the second curved surface 22 to open and close. Specifically, the first curved surface 21 includes a descending surface 211, a horizontal surface 212 and an ascending surface 213 which are sequentially connected to form a ring, when the cam 2 rotates until the positioning module 3 contacts with the descending surface 211, the positioning module 3 gradually moves downward toward the product, when the cam 2 rotates until the positioning module 3 contacts with the horizontal surface 212, the positioning module 3 keeps its position unchanged, and when the cam 2 rotates until the positioning module 3 contacts with the ascending surface 213, the positioning module 3 gradually moves upward away from the product. The second curved surface 22 includes a first claw opening surface 221, a claw receiving positioning surface 222, a second claw opening surface 223 and a claw closing surface 224 which are sequentially connected, when the cam 2 rotates until the positioning claw assembly 32 contacts with the first claw opening surface 221, the positioning claw assembly 32 gradually opens, when the cam 2 rotates until the positioning claw assembly 32 contacts with the claw receiving positioning surface 222, the positioning claw assembly 32 inwardly contracts, so that the positioning claw assembly 32 contacts with a product to position the product, when the cam 2 rotates until the positioning claw assembly 32 contacts with the second claw opening surface 223, the positioning claw assembly 32 re-opens, and when the cam 2 rotates until the positioning claw assembly 32 contacts with the claw closing surface 224, the positioning claw assembly 32 gradually closes. The descending surface 211 faces the first claw opening surface 221, the horizontal surface 212 faces the claw closing positioning surface 222 and the second claw opening surface 223, and the ascending surface 213 faces the claw closing surface 224. The descending surface 211 is a section from a1 to b1, the horizontal surface 212 is a section from b1 to d1, and the ascending surface 213 is a section from d1 to a 1; the first claw opening surface 221 is a section from a2 to b2, the claw closing positioning surface 222 is a section from b2 to c2, the second claw opening surface 223 is a section from c2 to d2, and the claw closing surface 224 is a section from d2 to a 2. Then, during the rotation of the cam 2, the position of the positioning module 3 and the state of the positioning pawl assembly 32 are in turn as follows: when the lifting block 31 abuts against a1, the positioning module 3 is at the highest position, and the positioning pawl assembly 32 abuts against a2, so that the positioning pawl assembly 32 is in a closed state; when the elevator block 31 goes from a1 to b1 (descending stage), the positioning module 3 gradually descends to the lowest position, and simultaneously the positioning pawl assembly 32 gradually goes from a2 stage to a2 stage (first pawl opening surface 221), and the positioning pawl assembly 32 gradually goes to an opening state from a closing state; when the lifting block 31 goes from b1 to d1 (horizontal section), the height of the positioning module 3 is unchanged, the positioning claw assembly 32 goes from b2 to c2 (claw-receiving positioning surface 222), the positioning claw assembly 32 retracts from the expanded state to be in contact with the edge of the product, so that the product is positioned, then the positioning assembly goes from c2 to d2, and the positioning claw assembly 32 is reopened from the semi-expanded state to the full-expanded state and is far away from the surface of the product; when the lifting block 31 goes from d1 to a1, the positioning module 3 gradually ascends from the lowest position to the highest position, and simultaneously, the positioning pawl assemblies 32 gradually gather from the fully opened state to the closed state from d2 to a 2.

The lifting positioning mechanism in the above embodiment includes a driving member 1, a cam 2 and a positioning module 3, the positioning module 3 includes a lifting block 31 and a positioning pawl assembly 32, the positioning module 3 is pushed by the first curved surface 21 of the cam 2 to lift, and the positioning pawl assembly 32 is controlled to open and close by the second curved surface 22 of the cam 2. Since the first curved surface 21 includes the descending surface 211, the horizontal surface 212, and the ascending surface 213, the second curved surface 22 includes a first claw opening surface 221, a claw receiving positioning surface 222, a second claw opening surface 223, and a claw engaging surface 224: when the cam 2 is made to rotate, the descending surface 211 pushes the positioning module 3 to descend, and simultaneously, the positioning claw assembly 32 is gradually opened under the pushing of the first claw opening surface 221; under the action of the horizontal plane 212, the height of the positioning module 3 is kept unchanged, meanwhile, the positioning pawl assembly 32 is firstly gradually closed under the pushing of the pawl-retracting positioning surface 222, so that the positioning pawl assembly 32 is in contact with the edge of a product to be positioned, the product is positioned, and then the positioning pawl assembly 32 is gradually opened under the action of the second pawl-opening surface 223 and is separated from the product; under the action of the rising surface 213, the positioning module 3 rises, while the positioning pawl assembly 32 is gradually closed under the action of the pawl engaging surface 224. So, under the combined action of first curved surface 21 and second curved surface 22, the location claw subassembly 32 realizes the location to the product, need not artifical adjustment product position, has greatly reduced the human cost, has improved production efficiency.

In one embodiment of the present invention, referring to fig. 2 and 3, the cam 2 may be cylindrical, the outer circumference of the cam 2 is provided with an annular groove 20, two opposite side walls of the annular groove 20 are first curved surfaces 21, and the two first curved surfaces 21 are parallel to each other and used for limiting the lifting block 31. More specifically, the end of the elevator block 31 is provided with a first bearing 311, the outer ring of the first bearing 311 abuts against the first curved surface 21, the first bearing 311 moves up and down along with the fluctuation of the first curved surface 21 when the cam 2 rotates, and the outer ring of the first bearing 311 can rotate relative to the elevator block 31, can roll on the first curved surface 21, and prevents the elevator block 31 from being stuck.

Optionally, the lifting positioning mechanism further includes a third elastic member 5, and two ends of the third elastic member 5 are respectively connected to the driving member 1 and the lifting block 31, so that the first bearing 311 is always abutted on the first curved surface 21. The lifting positioning mechanism further comprises a frame 4, so that two ends of the third elastic element 5 are respectively connected to the frame 4 and the lifting block 31. The third elastic element 5 may be a tension spring, and the first bearing 311 abuts against the upper curved surface of the cam 2. The number of the third elastic members 5 is two, and the two third elastic members are respectively arranged on two opposite sides of the lifting block 31, so that the movement of the lifting block 31 is more stable.

In one embodiment of the present invention, referring to fig. 4 and 5, a second bearing 3211 is disposed at an end of the positioning pawl assembly 32, that is, a second bearing 3211 is disposed at an end of the lower pressing rod 321, the second bearing 3211 abuts against the second curved surface 22, and when the cam 2 rotates, the lower pressing rod 321 rises or falls along with the rise and fall of the second curved surface 22, so that the positioning pawl assembly 32 is correspondingly closed or opened.

The first bearing 311 and the second bearing 3211 are not limited to a ball bearing, a roller bearing, or the like that is conventionally used, and may be a structural member such as a roller 3222 as long as the structural member can rotate with respect to the lift block 31 and the push rod 321.

In one embodiment of the present invention, referring to fig. 4 and 5, the positioning pawl assembly 32 includes a pressing rod 321 and a plurality of clamping jaw units 322, and the plurality of clamping jaw units 322 are disposed around the pressing rod 321. The number of the clamping jaw units 322 is at least two, for example, when the number of the clamping jaw units 322 is four, the clamping jaw units 322 are circumferentially and uniformly distributed around the lower pressing rod 321, and clamp and position four sides of the product respectively. The lower pressing rod 321 moves up and down along the second curved surface 22 under the action of the second bearing 3211. When the pressing rod 321 moves downwards, the clamping jaw unit 322 can be pushed to swing away from the pressing rod 321, and when the pressing rod 321 moves upwards, the clamping jaw unit 322 swings towards the center of the pressing rod 321 and returns to the original position.

Optionally, referring to fig. 4 and 5, the gripper unit 322 includes a swinging claw 3221, a roller 3222, and a first elastic member 3223, the swinging claw 3221 is hinged to the lifting block 31, the roller 3222 is disposed on the swinging claw 3221 and can rotate relative to the swinging claw 3221, and two ends of the first elastic member 3223 are respectively connected between the lifting block 31 and the swinging claw 3221. Under the action of the first elastic element 3223, the bottom end of the swinging claw 3221 is disposed toward the central axis of the downward pressing rod 321, when the downward pressing rod 321 moves downward, the downward pressing rod 321 contacts the roller 3222 and pushes the swinging claw 3221 to swing, so that the bottom end of the swinging claw 3221 is away from the central axis of the downward pressing rod 321, and thus each swinging claw 3221 is in an open state, when the downward pressing rod 321 moves upward, the downward pressing rod 321 is separated from the roller 3222, and the swinging claw 3221 returns to the initial position (a folded state) by the first elastic element 3223 without an external force. The roller 3222 is arranged such that the pressing rod 321 will not get stuck when pushing the swing claw 3221, and the friction force is smaller.

In one embodiment of the present invention, referring to fig. 5, the positioning module 3 further includes a sleeve 324, a second elastic member 323, and a limit pin 325, the sleeve 324 is inserted and fixed in the lifting block 31, the lower pressing rod 321 is disposed through the sleeve 324, and two ends of the second elastic member 323 are respectively elastically connected to the sleeve 324 and the second bearing 3211. A strip-shaped hole 3244 is formed in the sleeve 324, the length direction of the strip-shaped hole 3244 is the vertical direction, and the limit pin 325 penetrates through the lifting block 31 and extends into the strip-shaped hole 3244. The limit pin 325 is fixedly connected with the lifting block 31, the limit pin 325 is inserted into the strip-shaped hole 3244, and the sleeve 324 can be prevented from rotating in the circumferential direction under the matching effect of the strip-shaped hole 3244 and the limit pin 325. It should be noted that the strip-shaped hole 3244 is more convenient to assemble, and the hole for inserting the stopper pin 325 may be a circular hole as long as the stopper pin 325 can be inserted. When the lifting block 31 is not moved and the lower pressing rod 321 moves upwards or downwards, the sleeve 324 is pressed against the inner wall of the lifting block 31 under the action of the second elastic piece 323, and even when the lower pressing rod 321 touches an external structure, a certain buffer protection effect can be achieved on the lower pressing rod 321.

In one embodiment of the present invention, referring to fig. 5, one end of the sleeve 324 has a first limiting boss 3243, the other end of the sleeve 324 has a second limiting boss, the first limiting boss 3243 extends radially outward, the first limiting boss 3243 abuts against the lifting block 31, so that when the sleeve 324 has a downward movement tendency, the sleeve 324 is pressed against the lifting block 31, one end of the second elastic element 323 abuts against the second limiting boss of the sleeve 324, and the second limiting boss is disposed to support the second elastic element 323.

In one embodiment of the present invention, referring to fig. 5, the sleeve 324 includes a pressure spring cushion block 3241 and a guide cylinder 3242, and the pressure spring cushion block 3241 and the guide cylinder 3242 are sequentially arranged along the axial direction of the push-down rod 321. The compression spring cushion block 3241 and the guide cylinder 3242 are both sleeved on the lower compression bar 321, the first limiting boss 3243 and the second limiting boss are respectively disposed at two ends of the compression spring cushion block 3241, and the strip-shaped hole 3244 is disposed on the guide cylinder 3242. The second elastic member 323 is sleeved on the lower pressing rod 321 and arranged inside the compressed spring cushion block 3241, so that the lower end of the second elastic member 323 abuts against the compressed spring cushion block 3241, and the second elastic member 323 does not need to extend into the guide cylinder 3242, so that interference with the limit pin 325 is avoided, and normal extension and retraction of the second elastic member 323 are ensured. The second elastic member 323 may be selected as a compression spring.

In one embodiment of the present invention, referring to fig. 5, the lifting and positioning mechanism includes a sliding block 8 and a sliding rail 7, the sliding block 8 is slidably connected to the sliding rail 7, and the lifting block 31 is fixed on the sliding block 8, so that the sliding rail 7 can guide the lifting block 31, and the positioning module 3 can be lifted and lowered smoothly without rocking left and right.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a lift positioning mechanism which characterized in that: the positioning module comprises a lifting block and a positioning claw assembly arranged on the lifting block, the cam is provided with a first curved surface and a second curved surface, the positioning module is pushed to lift by the first curved surface, and the positioning claw assembly is controlled to open and close by the second curved surface; the first curved surface comprises a descending surface, a horizontal surface and an ascending surface which are sequentially connected and in an annular shape, the descending surface, the horizontal surface and the ascending surface are respectively used for pushing the positioning module to descend, keep the height unchanged and ascend, and the second curved surface comprises a first claw opening surface, a claw folding positioning surface, a second claw opening surface and a claw closing surface which are sequentially connected and in an annular shape; the descending surface is opposite to the first jaw opening surface, the horizontal surface is opposite to the jaw closing positioning surface and the second jaw opening surface, and the ascending surface is opposite to the jaw closing surface.

2. The lift positioning mechanism of claim 1, wherein: the cam is provided with an annular groove, two opposite side walls of the annular groove are both the first curved surface, the end part of the lifting block is provided with a first bearing, and the outer ring of the first bearing is abutted to the first curved surface.

3. The lift positioning mechanism of claim 1, wherein: the positioning claw assembly comprises a lower pressing rod and a plurality of clamping jaw units arranged on the periphery of the lower pressing rod, and the lower pressing rod is used for pushing the clamping jaw units to swing.

4. The lift positioning mechanism of claim 3, wherein: the clamping jaw unit comprises a swinging claw hinged to the lifting block, a roller arranged on the swinging claw and abutted to the lower pressing rod, and a first elastic piece connected between the lifting block and the swinging claw.

5. The lift positioning mechanism of claim 3, wherein: one end of the lower pressure rod is provided with a second bearing which is abutted to the second curved surface.

6. The lift positioning mechanism of claim 5, wherein: the positioning module further comprises a sleeve, a second elastic piece and a limiting pin, the sleeve penetrates through the lifting block, the lower pressing rod penetrates through the sleeve, two ends of the second elastic piece are respectively and elastically connected with the sleeve and the second bearing, a strip-shaped hole is formed in the sleeve, and the limiting pin penetrates through the lifting block and stretches into the strip-shaped hole.

7. The lift positioning mechanism of claim 6, wherein: one end of the sleeve is provided with a first limiting boss which extends radially outwards and abuts against the lifting block, the other end of the sleeve is provided with a second limiting boss which extends radially inwards, and the second elastic piece abuts against the second limiting boss.

8. The lift positioning mechanism of claim 7, wherein: the sleeve comprises a pressure spring cushion block and a guide cylinder which are sequentially arranged along the axial direction of the lower pressure rod, the first limiting boss and the second limiting boss are respectively arranged at two ends of the pressure spring cushion block, and the strip-shaped hole is formed in the guide cylinder.

9. The elevating positioning mechanism as set forth in any one of claims 1-8, wherein: the lifting positioning mechanism further comprises a third elastic piece, and two ends of the third elastic piece are respectively connected to the driving piece and the lifting block.

10. The elevating positioning mechanism as set forth in any one of claims 1-8, wherein: the lifting positioning mechanism further comprises a sliding block and a sliding rail fixedly arranged, the sliding block is connected with the sliding rail in a sliding mode, and the sliding block is fixedly connected with the lifting block.

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