CN218335670U - Positioning device - Google Patents

Abstract

The utility model belongs to the technical field of the motor preparation, more specifically say, relate to a positioner, include: installing a disc; the positioning disc is arranged on the mounting disc and can rotate relative to the mounting disc by taking the central line of the positioning disc as an axis, a groove which is axially communicated is formed in the central area of the positioning disc, and a plurality of spiral surfaces are formed on the inner wall of the groove; the first driving piece is arranged on the mounting disc; the first clamping assembly is movably arranged on the mounting disc and positioned in the groove, the first clamping assembly comprises a plurality of first clamping pieces which are uniformly distributed along the circumferential direction and surround the group circular stator, and each first clamping piece is used for abutting against a spiral surface; the first driving part is used for driving the positioning disc to rotate and driving a plurality of first clamping parts located in the grooves to radially move along the positioning disc so as to clamp the outer ring of the group circular stator. The utility model provides a positioner can avoid welding the excircle of back group circle stator to have the deviation, improves the welding quality of group circle stator.

Description

Positioning device

Technical Field

The utility model belongs to the technical field of the motor preparation, more specifically say, relate to a positioner.

Background

In the manufacturing process of the motor, the wire embedding and paint dropping operation needs to be carried out on the whole stator core, the wire embedding operation is complex due to the shape of the stator core, the proficiency of operators is high, and the quality of the stator core is difficult to guarantee.

In order to solve the problem, the method adopted at present is to manufacture the stator core in blocks, namely to manufacture the stator core into a plurality of block stators, then to wind each block stator through a winding machine, and to position and weld the group round stator through a manual mode after the winding is finished. However, the manual positioning method for the stator assembly has the defects of inaccurate positioning between the stator blocks and deviation of the welded outer circle, so that the welding quality of the stator assembly is still difficult to ensure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a positioner to when carrying out the completion welding of fixing a position to group circle stator through artificial mode among the solution prior art, the location is inaccurate between each piecemeal stator of existence, there is the shortcoming of deviation in the welding back excircle, leads to the technical problem that the welding quality of group circle stator is difficult to guarantee.

In order to achieve the above object, the utility model adopts the following technical scheme: there is provided a positioning device comprising: installing a disc; the positioning disc is arranged on the mounting disc and can rotate relative to the mounting disc by taking the central line of the positioning disc as an axis, a groove which is axially communicated is formed in the central area of the positioning disc, and a plurality of spiral surfaces are formed on the inner wall of the groove; the first driving piece is mounted on the mounting disc; the first clamping assembly is movably arranged on the mounting disc and positioned in the groove, the first clamping assembly comprises a plurality of first clamping pieces which are uniformly distributed along the circumferential direction and surround the group circular stator, and each first clamping piece is used for abutting against one spiral surface; the first driving part is used for driving the positioning disc to rotate and driving the first clamping parts located in the grooves to move radially along the positioning disc so as to clamp the outer ring of the group circular stator.

Furthermore, the positioning device further comprises a guide piece arranged on the mounting disc and located in the groove, a plurality of guide grooves which are radially communicated are formed in the guide piece, and the first clamping piece is located in the guide grooves.

Furthermore, the first clamping assembly further comprises an elastic piece and an abutting piece, a through hole which penetrates through the first clamping piece along the circumferential direction is formed in the first clamping piece, the abutting piece is located in the through hole, and two ends of the abutting piece in the circumferential direction protrude out of the through hole and are respectively fixed on two inner walls opposite to the guide groove; the radial two ends of the elastic piece are respectively abutted to the abutting piece and the hole wall of the through hole, and the elastic piece is used for providing radial restoring force for the abutting piece.

Furthermore, two adjacent guide grooves on the guide piece are provided with an avoidance groove which axially penetrates through the guide grooves.

Furthermore, the first clamping component further comprises a rolling bearing arranged at one end, close to the positioning disc, of the first clamping piece, and the rotating central axis of the rolling bearing is parallel to the central axis of the positioning disc.

Further, one end of the first driving piece is rotatably connected to the mounting disc, the other end of the first driving piece is rotatably connected to the positioning disc, and the first driving piece can linearly stretch out and draw back.

Furthermore, the positioning device also comprises a first connecting piece and a second connecting piece, wherein the first connecting piece protrudes out of the peripheral surface of the mounting disc, one end of the first connecting piece is fixed on the mounting disc, and the other end of the first connecting piece is connected with one end of the first driving piece; the second connecting piece protrudes out of the peripheral surface of the positioning disc, one end of the second connecting piece is fixed on the positioning disc, and the other end of the second connecting piece is rotatably connected with one end, far away from the first connecting piece, of the first driving piece.

Furthermore, the number of the first driving pieces is three, the three first driving pieces are respectively connected with three positions of the positioning disc, and the three positions are uniformly distributed along the circumferential direction of the positioning disc.

Furthermore, the positioning device further comprises a second clamping assembly, a connecting column and a second driving piece, wherein the second clamping assembly comprises a plurality of second clamping pieces which are uniformly distributed along the circumferential direction and surround the inner ring of the group of circular stators; the connecting column is gradually changed in diameter in the axial direction, the connecting column comprises a first end and a second end which are opposite in the axial direction, the first end is connected with the second driving piece, and the second end penetrates through the central area of the second clamping assembly; the second driving piece is used for driving the connecting column to move axially and driving the second clamping pieces to move radially.

Further, the positioning device further comprises an elastic ring; the elastic ring is sleeved on the outer side of the second clamping assembly and used for providing radial restoring force for the second clamping assembly.

The utility model provides a positioning device, compared with the prior art, be located the inslot of positioning disk with first centre gripping subassembly, form a plurality of helicoids on the inner wall of groove, each first holder is used for helicoid of butt, rotate through first driving piece drive positioning disk, drive first holder along radial movement, thereby press from both sides tightly or loosen the outer lane of group circle stator, need not to fix a position the group circle stator through artificial mode, make the location accurate between each block stator, there is the deviation in the excircle of avoiding welding back group circle stator, improve the welding quality of group circle stator.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced 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 inventive labor.

Fig. 1 is a schematic structural diagram of a positioning device according to an embodiment of the present invention;

fig. 2 is a schematic partial structural view of a positioning device according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a guide and a first clamping assembly according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a guide member according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a mounting plate according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a first clamping member according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a second clamping member and a second driving member according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a connection column according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-mounting a disc; 2-positioning the disc; 21-groove; 3-a first drive member; 4-a first clamping assembly; 41-a first clamp; 42-an elastic member; 43-an abutment; 44-a through hole; 45-rolling bearings; 5-a guide; 51-a guide groove; 52-avoidance slot; 6-a first connector; 7-a second connector; 8-a second clamping assembly; 81-a second clamp; 811-a first portion; 812-a second portion; 9-connecting column; 91-a first end; 92-a second end; 10-a second driving member; 20-elastic ring.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

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 that 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 thus should not be considered as limiting the present application.

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 one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, fig. 2 and fig. 5, the positioning device provided by the present invention will now be described, which includes: a mounting plate 1; the positioning disc 2 is arranged on the mounting disc 1 and can rotate relative to the mounting disc 1 by taking the central line of the positioning disc 2 as an axis, and a groove 21 which is through along the axial direction of the positioning disc 2 is formed in the central area of the positioning disc 2; the first driving piece 3 is mounted on the mounting disc 1, connected to the positioning disc 2 and used for driving the positioning disc 2 to rotate relative to the mounting disc 1; the first clamping component 4 is movably arranged on the mounting disc 1 and is positioned in the groove 21; wherein, first driving piece 3 drive positioning disk 2 rotates, and positioning disk 2 is used for driving the outer lane with the outer lane of centre gripping group circle stator along positioning disk 2's radial movement of first centre gripping subassembly 4 that is located the groove 21 when it rotates.

In specific implementation, a plurality of periodic helicoids are arranged on the inner wall of the groove 21, the first driving part 3 drives the positioning disc 2 to rotate, so that the first clamping component 4 and the positioning disc 2 rotate relatively, when the distance from the inner wall of the groove 21, which is in contact with the first clamping component 4, to the center of the positioning disc 2 is gradually reduced, the first clamping component 4 moves towards the direction close to the group circle stator along the radial direction to clamp the outer ring of the group circle stator, and then the adjacent block stators are welded through the laser device; after the welding is completed, the first driving piece 3 drives the positioning disc 2 to rotate reversely, and when the distance between the groove wall of the groove 21 contacted with the first clamping assembly 4 and the center of the positioning disc 2 is gradually increased, the first clamping assembly 4 moves along the radial direction towards the direction far away from the group circular stator, so that the welded group circular stator is loosened, and then the welded group circular stator is subjected to blanking.

Specifically, referring to fig. 3, the first clamping assembly 4 includes a plurality of first clamping members 41 uniformly distributed along the circumferential direction and surrounding the group circular stator, a plurality of spiral surfaces are formed on the inner wall of the slot 21, each first clamping member 41 is used for abutting against one spiral surface, and the positioning plate 2 rotates to drive each first clamping member 41 to move radially in the slot 21. One end of the first clamping piece 41 close to the group circular stator can be set to be an arc shape corresponding to the shape of the outer ring of the group circular stator, so that the outer ring of the group circular stator is uniformly stressed. Preferably, when the positioning disc 2 rotates, the plurality of first clamping members 41 synchronously move radially in the slot 21, and the number of the first clamping members 41 may be the same as that of the segmented stators in the circular stator assembly, that is, each first clamping member 41 corresponds to one segmented stator, so that the circular stator assembly can be ensured to be always kept when being clamped.

The connection mode that the positioning disk 2 can rotate relative to the mounting disk 1 by taking the central line of the positioning disk 2 as an axis can be various, for example, an annular groove is formed in the positioning disk 2, an annular protrusion corresponding to the annular groove is arranged on the mounting disk 1, and the positioning disk 2 and the mounting disk 1 are connected in a rotating mode through accommodating the annular protrusion in the annular groove. The positioning disc 2 can be provided with an annular protrusion, the mounting disc 1 is provided with an annular groove corresponding to the annular protrusion, the positioning disc 2 and the mounting disc 1 can be connected in a rotating mode as long as the annular groove can be formed, and the technical personnel in the field can select the annular protrusion according to actual needs.

The utility model provides a positioning device, compared with the prior art, be located the groove 21 of positioning disk 2 with first centre gripping subassembly 4, form a plurality of helicoids on the inner wall of groove 21, each first holder 41 is used for helicoid of butt, drive positioning disk 2 through 3 drive of first driving piece and rotate, drive first holder 41 along radial movement, thereby press from both sides tightly or loosen the outer lane of group circle stator, need not to fix a position the group circle stator through artificial mode, make the location accurate between each block stator, there is the deviation in the excircle of avoiding welding back group circle stator, improve the welding quality of group circle stator.

In an embodiment, referring to fig. 3 and 4, the positioning device further includes a guide 5 disposed on the mounting plate 1 and located in the groove 21, the guide 5 is formed with a plurality of radially penetrating guide grooves 51, and the first clamping member 41 is located in the guide grooves 51 for movement. In specific implementation, the number of the guide grooves 51 is the same as that of the first clamping pieces 41, and the guide piece 5 is provided with a plurality of guide grooves 51 penetrating in the radial direction, so that the radial movement of the first clamping pieces 41 can be guided, and the plurality of first clamping pieces 41 can stably clamp or loosen the outer ring of the assembled circular stator.

In an embodiment, referring to fig. 6, the first clamping assembly 4 further includes an elastic member 42 and an abutting member 43, the first clamping member 41 is provided with a through hole 44 penetrating along a circumferential direction, the abutting member 43 is located in the through hole 44, and two ends of the abutting member 43 in the circumferential direction protrude out of the through hole 44 and are respectively fixed on two opposite inner walls of the guide groove 51; the two ends of the elastic element 42 in the radial direction abut against the abutting element 43 and the hole wall of the through hole 44, respectively, and the elastic element 42 is used for providing a radial restoring force for the abutting element 43.

Two ways of the two ends of the elastic element 42 respectively abutting against the abutting element 43 and the hole wall of the through hole 44 may be two, for example, the two ends of the elastic element 42 respectively abut against the abutting element 43 and the hole wall of the through hole 44 near the circular stator, when the first clamping element 41 clamps the outer ring of the circular stator, the elastic element 42 is stressed and stretched, when the first driving element 3 stops driving the positioning disc 2 to rotate, the elastic element 42 is recovered, and the first clamping element 41 loosens the outer ring of the circular stator under the pulling force of the elastic element 42; the two ends of the elastic element 42 respectively abut against the abutting element 43 and the through hole 44, which are far away from the hole wall of the circular stator assembly, when the first clamping element 41 clamps the outer ring of the circular stator assembly, the elastic element 42 is compressed by force, when the first driving element 3 stops driving the positioning disk 2 to rotate, the elastic element 42 is recovered, and the first clamping element 41 loosens the outer ring of the circular stator assembly under the thrust action of the elastic element 42. As long as the elastic element 42 can drive the first clamping element 41 to reset when the first driving element 3 stops driving, a person skilled in the art can select the arrangement according to actual needs.

The two ends of the abutting part 43 are fixed on the two opposite groove walls of the guide groove 51 respectively, and may be fixed by a fastener, or by the mutual cooperation between a protrusion and a groove, and may be set according to actual requirements. The elastic member 42 is used for resetting the first clamping member 41, and the first driving member 3 is not needed to be used for resetting the first clamping member 41, so that the service life of the first driving member 3 can be prolonged.

In an embodiment, referring to fig. 3 and 4, an axially penetrating bypass groove 52 is formed between two adjacent guide grooves 51 on the guide 5. The number of the avoidance slots 52 may be the same as the number of welds of the group circular stator, i.e., the number of the avoidance slots 52 is equal to the number of the segmented stators in the group circular stator. By providing the avoidance groove 52, the blocking of the weld by the guide 5 can be avoided, so that the weld can be conveniently welded by the laser gun.

In an embodiment, referring to fig. 3 and 6 in combination, first clamping assembly 4 further includes a rolling bearing 45 disposed at an end of first clamping member 41 adjacent to puck 2, and having a central axis of rotation parallel to the central axis of puck 2. So set up, can avoid first holder 41 and positioning disk 2 direct contact, frictional force when reducing positioning disk 2 and rotating improves positioning disk 2 and first holder 41's life. During specific implementation, an accommodating groove facing the opening of the positioning plate 2 may be formed in one end of the first clamping member 41 close to the positioning plate 2, and the rolling bearing 45 is movably installed in the accommodating groove and is in contact with the positioning plate 2 through the rolling bearing 45.

In an embodiment, as shown in fig. 1, one end of the first driving member 3 is rotatably connected to the mounting plate 1, the other end of the first driving member 3 is rotatably connected to the positioning plate 2, and the first driving member 3 can linearly extend and retract, so that the linear extending and retracting motion of the first driving member 3 can be converted into the rotation of the positioning plate 2. The first driving member 3 may be a motor, an air cylinder or a hydraulic cylinder, or may be combined with some conversion of transmission components, as long as the positioning disk 2 can be driven to rotate, the number of the first driving member 3 may be one, or multiple, and is not particularly limited, and those skilled in the art may select the setting according to actual needs. Preferably, the number of the first driving members 3 is three, and the three first driving members 3 respectively drive three positions of the positioning disc 2, and the three positions are uniformly distributed along the circumferential direction of the positioning disc 2, so that the rotation of the positioning disc 2 can be more stable.

Further, with continued reference to fig. 1, the positioning device further includes a first connecting member 6 and a second connecting member 7, the first connecting member 6 protrudes from the outer circumferential surface of the mounting plate 1, one end of the first connecting member is fixed to the mounting plate 1, and the other end of the first connecting member is connected to one end of the first driving member 3; the second connecting piece 7 protrudes out of the outer peripheral surface of the positioning disc 2, one end of the second connecting piece is fixed on the positioning disc 2, and the other end of the second connecting piece is rotatably connected with one end of the first driving piece 3, which is far away from the first connecting piece 6. In specific implementation, one end of the first connecting piece 6 is fixed on the outer side wall of the mounting disc 1, and the other end of the first connecting piece 6 is rotatably connected with one end of the first driving piece 3; one end of the second connecting piece 7 is fixed on the outer side wall of the positioning plate 2.

In an embodiment, referring to fig. 7 and 8 in combination, the positioning apparatus further includes a second clamping assembly 8, a connecting column 9, and a second driving member 10, wherein the second clamping assembly 8 includes a plurality of second clamping members 81 uniformly distributed along the circumferential direction and surrounding the inner ring of the circular stator; the connecting column 9 is tapered in diameter in the axial direction, the connecting column 9 comprises a first end 91 and a second end 92 which are axially opposite, the first end 91 is connected with the second driving member 10, and the second end 92 penetrates through the central area of the second clamping component 8; the second driving member 10 is used for driving the connecting column 9 to move axially, and driving each second clamping member 81 to move radially. The diameter of the first end 91 of the connecting column 9 may be larger than the diameter of the second end 92, and the diameter of the first end 91 of the connecting column 9 may also be smaller than the diameter of the second end 92, as long as the diameter of the connecting column 9 in the axial direction gradually changes, and those skilled in the art can select the setting according to actual needs. Here, only the case where the diameter of the first end 91 of the connecting column 9 is smaller than the diameter of the second end 92 will be described as an example. Specifically, the second driving element 10 drives the connecting column 9 to move axially, so that the second end 92 of the connecting column 9 gradually moves towards the inside of the second clamping assembly 8, and a force deviating from the center of the second clamping assembly 8 is applied to the inner ring of the circular stator, so as to tension the inner ring of the circular stator. During the concrete implementation, first driving piece 3 and second driving piece 10 can synchronous motion for first centre gripping subassembly 4 presss from both sides tightly to the outer lane of group circle stator, and second centre gripping subassembly 8 rises tightly to the inner circle of group circle stator, thereby conveniently welds to the group circle stator. The second driving member 10 may be a motor, an air cylinder or a hydraulic cylinder, as long as it can drive the connecting column 9 to move axially, and those skilled in the art can select the setting according to actual needs.

In an embodiment, as shown in fig. 7, the positioning device further includes an elastic ring 20, and the elastic ring 20 is disposed on an outer side of the second clamping member 8 for providing a radial restoring force to the second clamping member 8. Specifically, each of the second clamping members 81 may include a first portion 811 and a second portion 812, one end of the first portion 811 is connected to the connection column 9, the other end of the first portion 811 is connected to the second portion 812, the first portion 811 is used for clamping an inner ring of the group circular stator, the elastic ring 20 is sleeved outside the second portion 812, and the first portion 811 and the second portion 812 may be integrally formed. The elastic ring 20 may be an O-ring or other elastic material, and may be specifically selected according to actual needs. When the second driving member 10 drives the second clamping assembly 8 to tension the inner ring of the paired circular stator, the connecting column 9 makes the first portion 811 and the second portion 812 of the second clamping member 81 move outwards, the second portion 812 moves outwards to open the elastic ring 20, and when the second driving member 10 stops driving, the elastic ring 20 is restored under the action of elastic force to drive the second portion 812 and the first portion 811 to move towards the direction close to the center of the second clamping assembly 8, thereby resetting of the second clamping member 81 is realized. The elastic ring 20 is used for resetting the second clamping piece 81, and the second driving piece 10 is not needed for resetting the second clamping piece 81, so that the service life of the second driving piece 10 can be prolonged. One side of the first portion 811 close to the inner ring of the circular stator assembly may be provided with a circular arc shape corresponding to the shape of the inner ring of the circular stator assembly, so that the inner ring of the circular stator assembly is uniformly stressed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims (10)

1. A positioning device, comprising:

mounting a disc;

the positioning disc is arranged on the mounting disc and can rotate relative to the mounting disc by taking the central line of the positioning disc as an axis, a groove which is axially communicated is formed in the central area of the positioning disc, and a plurality of spiral surfaces are formed on the inner wall of the groove;

a first drive member mounted to the mounting plate;

the first clamping assembly is movably arranged on the mounting disc and positioned in the groove, the first clamping assembly comprises a plurality of first clamping pieces which are uniformly distributed along the circumferential direction and surround the group circular stator, and each first clamping piece is used for abutting against one spiral surface;

the first driving piece is used for driving the positioning disc to rotate and driving the plurality of first clamping pieces located in the grooves to move along the radial direction of the positioning disc so as to clamp the outer ring of the group circular stator.

2. The positioning device as claimed in claim 1, further comprising a guide member disposed on the mounting plate and located in the groove, wherein the guide member has a plurality of radially extending guide grooves formed therein, and the first clamping member is located in the guide grooves.

3. The positioning apparatus according to claim 2, wherein the first clamping assembly further comprises an elastic member and an abutting member, the first clamping member is provided with a through hole penetrating along a circumferential direction, the abutting member is located in the through hole, and two circumferential ends of the abutting member protrude out of the through hole and are respectively fixed on two opposite inner walls of the guide slot; the radial two ends of the elastic piece are respectively abutted to the abutting piece and the hole wall of the through hole, and the elastic piece is used for providing radial restoring force for the abutting piece.

4. The positioning device as set forth in claim 2, wherein an axially extending avoiding groove is defined between adjacent two of said guide grooves on said guide member.

5. The positioning device of claim 1, wherein the first clamping assembly further comprises a rolling bearing disposed at an end of the first clamping member adjacent the puck, the rolling bearing having a center axis of rotation parallel to the center axis of the puck.

6. The positioning device as set forth in claim 1, wherein one end of said first driving member is rotatably connected to said mounting plate, and the other end of said first driving member is rotatably connected to said positioning plate, said first driving member being linearly extendable and retractable.

7. The positioning device according to claim 6, wherein the positioning device further comprises a first connecting member and a second connecting member, the first connecting member protruding from the outer peripheral surface of the mounting plate, having one end fixed to the mounting plate and the other end connected to one end of the first driving member;

the second connecting piece protrudes out of the peripheral surface of the positioning disc, one end of the second connecting piece is fixed on the positioning disc, and the other end of the second connecting piece is rotatably connected with one end, far away from the first connecting piece, of the first driving piece.

8. The positioning device as set forth in claim 1, wherein the number of the first driving members is three, three of the first driving members are connected to three positions of the positioning plate, respectively, and the three positions are uniformly distributed in a circumferential direction of the positioning plate.

9. The positioning device according to any one of claims 1 to 8, further comprising a second clamping assembly, a connecting column and a second driving member, wherein the second clamping assembly comprises a plurality of second clamping members uniformly distributed along the circumferential direction and surrounding the inner ring of the group of circular stators;

the connecting column is gradually changed in diameter in the axial direction, the connecting column comprises a first end and a second end which are opposite in the axial direction, the first end is connected with the second driving piece, and the second end penetrates through the central area of the second clamping assembly;

the second driving piece is used for driving the connecting column to move axially and driving the second clamping pieces to move radially.

10. The positioning device of claim 9, further comprising an elastic ring; the elastic ring is sleeved on the outer side of the second clamping assembly and used for providing radial restoring force for the second clamping assembly.

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