Positioning device

Abstract

The utility model relates to a positioning device which comprises an expansion positioning pin, an elastic reset piece and a positioning pin, and the expansion driving part extends in the axial direction of the expansion positioning pin, and the expansion driving part is configured to drive the expansion positioning pin to expand when the expansion driving part moves towards the direction close to the expansion positioning pin, and the expansion positioning pin shrinks when the expansion driving part moves towards the direction away from the expansion positioning pin. The expansion driving part moves in the direction close to or away from the expansion positioning pin, the expansion driving part can drive the expansion positioning pin to expand, or the elastic reset part drives the expansion positioning pin to contract, and the expansion positioning pin in the expansion or contraction state can have different outer diameters so as to adapt to end plate holes of different sizes. The technical problems that in the prior art, the size of an end plate hole cannot be completely matched with the size of each pin body, and the position accuracy cannot meet the requirement when each structure is installed are solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a positioning device. Background Art

[0002] Currently, when assembling battery modules, end plates are usually used to provide channels for routing the battery modules and installation space for various detection units. The end plate holes are usually used to fix the position of the battery modules to ensure the accuracy of the installation position of each structure during the battery assembly process.

[0003] However, there is usually a certain tolerance when the end plate holes are opened. When the end plates are positioned using end plate holes and pins such as cylindrical pins, the size of the end plate holes cannot be fully adapted to the size of each pin. Therefore, the position of the end plate will be offset during the assembly of the battery module, making the position accuracy of each structure during installation fail to meet the requirements. Summary of the Invention

[0004] The present application provides a positioning device that can solve the technical problem in the related art that the size of the end plate hole cannot be fully adapted to the size of each pin body, the position of the end plate will be offset during the assembly of the battery module, and the position accuracy of each structure during installation cannot meet the requirements.

[0005] In a first aspect, an embodiment of the present application provides a positioning device, comprising: an expansion positioning pin, wherein an elastic reset member is provided around the outer periphery of the expansion positioning pin; an expansion driving member, wherein the expansion driving member extends along the axial direction of the expansion positioning pin, and the expansion driving member is configured such that when the expansion driving member moves in a direction close to the expansion positioning pin, the expansion driving member drives the expansion positioning pin to expand, and when the expansion driving member moves in a direction away from the expansion positioning pin, the expansion positioning pin contracts.

[0006] In combination with the first aspect, in one embodiment, the expansion positioning pin includes a plurality of expansion sheets, the plurality of expansion sheets are distributed along the circumferential direction of the expansion positioning pin, and the elastic reset member is arranged around the outer circumference of the plurality of expansion sheets, the plurality of expansion sheets form a through-hole, and the expansion driving member is arranged through the through-hole.

[0007] In combination with the first aspect, in one embodiment, the elastic return member is disposed around one end of the expansion sheet close to the expansion drive member.

[0008] In combination with the first aspect, in one embodiment, the positioning device also includes a pin piece fixing block, the pin piece fixing block has a pin hole, and multiple expansion pieces are inserted into the pin hole; the pin piece fixing block also has a receiving groove, the receiving groove is connected to the pin hole, and the elastic reset member is installed in the receiving groove.

[0009] In combination with the first aspect, in one embodiment, each of the expansion plates includes a connecting seat and a short plate fixed to the connecting seat, the connecting seat is fixed to one end of the short plate close to the expansion driving member, and the connecting seats all protrude toward the side away from the through-hole; the elastic reset member is arranged around the periphery of multiple connecting seats.

[0010] In combination with the first aspect, in one embodiment, wear grooves are provided on outer sides of the expansion pieces, and the wear grooves extend along the axial direction of the expansion pieces.

[0011] In combination with the first aspect, in one embodiment, a guide section is provided at one end of each expansion piece.

[0012] In combination with the first aspect, in one embodiment, the positioning device further includes a driving mechanism, which is fixed to the expansion driving member, and the driving mechanism drives the expansion driving member to move toward or away from the expansion positioning pin.

[0013] In combination with the first aspect, in one embodiment, the expansion drive member is a cone structure, and the diameter of the expansion drive member at one end close to the expansion positioning pin is smaller than the diameter of the expansion drive member at one end away from the expansion positioning pin.

[0014] In combination with the first aspect, in one embodiment, the positioning device also includes a fixed platform, which is provided with a movable hole; the driving mechanism includes a handle and a connecting rod with one end hinged to the handle, the other end of the connecting rod is hinged to the fixed platform, and the handle is hinged to the expansion driving member. When the handle is pressed down, the handle drives the expansion driving member to move toward the side close to the expansion positioning pin, so that the expansion driving member drives the expansion positioning pin to expand. When the handle is lifted, the handle drives the expansion driving member to move toward the side away from the expansion positioning pin, and the expansion positioning pin contracts.

[0015] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0016] By moving the expansion drive member toward or away from the expansion positioning pin, the expansion drive member can drive the expansion positioning pin to expand, or the elastic reset member can drive the expansion positioning pin to contract. The expansion positioning pin in the expanded or contracted state can have different outer diameters to adapt to end plate holes of different sizes, solving the technical problems in related technologies that the size of the end plate hole cannot be fully matched with the size of each pin body, and the position accuracy of each structure during installation cannot meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the positioning device provided in an embodiment of the present application;

[0019] Figure 2 A cross-sectional view of a positioning device provided in an embodiment of the present application;

[0020] Figure 3 An exploded schematic diagram of the expansion positioning pin provided in an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a wear groove provided in an expansion positioning pin according to an embodiment of the present application.

[0022] In the picture:

[0023] 1. Expansion locating pin; 11. Expansion piece; 111. Through hole; 112. Guide section; 113. Wear groove; 114. Connecting seat; 115. Short piece; 12. Chamfered section; 13. Vertical section;

[0024] 2. Expansion drive components;

[0025] 4. Pin fixing block; 41. Pin hole; 42. Accommodation groove;

[0026] 5. Driving mechanism; 51. Handle; 52. Connecting rod; 53. Articulated section; 54. Through-rod member;

[0027] 6. Fixed platform; 61. Moving hole;

[0028] 7. Elastic reset part. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] An embodiment of the present application provides a positioning device that can solve the technical problem in the related art that the size of the end plate hole cannot be fully adapted to the size of each pin body, the position of the end plate will be offset during the assembly of the battery module, and the position accuracy of each structure during installation cannot meet the requirements.

[0031] See also Figure 1 As shown, a positioning device provided by an embodiment of the present application may include: an expansion positioning pin 1, an elastic reset member 7 is provided on the outer periphery of the expansion positioning pin 1; an expansion driving member 2, the expansion driving member 2 may be a center pin, and the material is wear-resistant steel. The expansion driving member 2 extends along the axial direction of the expansion positioning pin 1, and the expansion driving member 2 is configured so that when the expansion driving member 2 moves toward the direction close to the expansion positioning pin 1, the expansion driving member 2 drives the expansion positioning pin 1 to expand, and when the expansion driving member 2 moves toward the direction away from the expansion positioning pin 1, the expansion positioning pin 1 contracts. It should be understood that the expansion positioning pin 1 can be expanded or contracted by the expansion driving member 2, and the expansion driving member 2 itself can be expandable or of a fixed size; the way in which the expansion driving member 2 drives the expansion positioning pin 1 to expand can be by approaching the expansion positioning pin 1 and inflating the expansion positioning pin 1 to make it expand, or by opening a through-hole in the expansion positioning pin 1, and the expansion positioning pin 1 approaches the expansion positioning pin 1 and is penetrated through the through-hole to make it expand.

[0032] In the embodiment of the present application, the expansion driver 2 moves toward or away from the expansion positioning pin 1, so that the expansion driver 2 drives the expansion positioning pin 1 to expand, or the elastic return member 7 drives the expansion positioning pin 1 to contract. The expansion positioning pin 1 can be configured as a pipe column made of polyurethane rubber with a through hole, and the through hole can extend along the axial direction of the pipe column. At this time, the pipe column itself has a certain supporting force. When the expansion driver 2 extends into the through hole, the pipe column is expanded by the expansion driver 2, and its outer diameter increases; when the expansion driver 2 leaves the through hole, the pipe column has a certain restoring force, and the inner diameter of the through hole can be partially retracted. In the embodiment of the present application, in order to enable the expansion positioning pin 1 to better return to its initial state or close to its initial state after each use, an elastic return member 7 is provided around its outer periphery. Under the action of the elastic return member 7, the further retraction of the pipe column can be promoted. In some other embodiments, the expansion positioning pin 1 can also be configured to be expanded by the action of the expansion driver 2, and to achieve other forms of contraction under the action of the elastic return member 7.

[0033] Preferably, the expansion positioning pin 1 in the expanded or contracted state can have different outer diameters to adapt to end plate holes of different sizes. It should be understood that the error when the end plate is opened must be within the tolerance range to be a qualified product. Therefore, the expansion positioning pin 1 can be set so that when it is contracted to the minimum size, it can pass through the end plate hole of the minimum size within the tolerance range, and the expansion drive member 2 can also be set to be able to expand into different sizes according to end plate holes of different sizes, so as to adapt to as many end plate holes of different sizes as possible. By setting the expansion positioning pin 1 to be able to contract or expand, the expansion positioning pin 1 can be supported on end plate holes of various sizes, effectively preventing the end plate from being offset, and solving the technical problem in the related technology that the size of the end plate hole cannot be fully adapted to the size of each pin body, and the position accuracy of each structure during installation cannot meet the requirements.

[0034] In some optional embodiments, the expansion positioning pin 1 includes a plurality of expansion sheets 11, each expansion sheet 11 can be separately arranged, and the plurality of expansion sheets 11 are distributed along the circumferential direction of the expansion positioning pin 1, and the elastic reset member 7 is arranged around the outer circumference of the plurality of expansion sheets 11, and the plurality of expansion sheets 11 form a through-hole 111, and the expansion driving member 2 is penetrated through the through-hole 111. That is to say, in the embodiment of the present application, the expansion driving member 2 drives the expansion positioning pin 1 to expand by penetrating the expansion driving member 2 into the through-hole 111. Preferably, the number of expansion sheets 11 is set to three or more. In the embodiment of the present application, the number of expansion sheets 11 is set to four, and the expansion sheets 11 can all be made of 65Mn material with moderate rigidity and flexibility, so that the expansion sheets 11 can be deformed by the expansion driving member 2 and are not easy to break. Each expansion piece 11 can extend along the axial direction of the expansion positioning pin 1, and each expansion piece 11 can be inserted into the end plate hole when it is not driven to expand. After the expansion driving member 2 penetrates the penetration hole 111, each expansion piece 11 can be gradually moved toward the side away from each other until each expansion piece 11 is in contact with the inner wall of the end plate hole. This setting makes the expansion process of the expansion positioning pin 1 more convenient, and can enable the expansion positioning pin 1 to quickly complete the positioning and fixation of the end plate hole, and can also quickly remove the expansion positioning pin 1 after the battery module is installed and move the battery module away.

[0035] In some optional embodiments, the elastic return member 7 is arranged around the end of the expansion piece close to the expansion drive member 2. The elastic return member 7 is arranged around the outer periphery of the expansion piece 11 so that multiple expansion pieces 11 can contact each other when there is no pressure from the expansion drive member 2, that is, the expansion positioning pin 1 remains in a contracted state at this time. In the embodiment of the present application, the elastic return member 7 is arranged at the end of the expansion piece 11 close to the expansion drive member 2 so that the restriction of the elastic return member 7 on the expansion piece 11 can be as small as possible. In addition, the elastic return member 7 can be a rubber ring, which has good elasticity. When the expansion drive member 2 acts on each expansion piece 11 and expands the expansion positioning pin 1, the rubber ring can have good elasticity and extend along with each expansion piece 11. When the expansion drive member 2 is away from the expansion positioning pin 1, the rubber ring can drive each expansion piece 11 to return to a contracted state in time, and the rubber ring can be made of silicone rubber material, so that it is not easy to wear, age and oxidize during long-term use. In some other embodiments, the expansion positioning pin 1 can achieve expansion by fixing elastic members on the adjacent sides of each expansion piece 11, and each expansion piece 11 is connected to each other through the elastic member.

[0036] In some optional embodiments, the positioning device further includes a pin fixing block 4, the pin fixing block 4 having a pin hole 41, and the plurality of expansion pieces 11 are all inserted into the pin hole 41. The inner diameter of the pin hole 41 is slightly larger than the outer diameter of the expansion positioning pin 1 formed by all the expansion pieces 11, and slightly larger than the outer diameter of the circle formed by the four expansion pieces 11. It can be used to control the size of the expansion piece 11 to prevent the expansion piece 11 from opening too much and causing the pin piece to break. The pin fixing block 4 also has a receiving groove 42, which is connected to the pin hole 41, and the elastic return member 7 is installed in the receiving groove 42. In the embodiment of the present application, the plurality of expansion pieces 11 can be limited by the pin fixing block 4. The end of all expansion pieces 11 away from the expansion drive member 2 can pass through the top of the pin fixing block 4. When the expansion piece 11 is needed to locate the end plate hole, the top surface of the pin fixing block 4 can be supported on the bottom surface of the end plate, further enhancing the stability of the end plate hole positioning by the expansion piece 11. Preferably, the size of the pin hole 41 is larger than the diameter of the expansion positioning pin 1 surrounded by multiple expansion sheets 11, and the distance between the top surface of the pin sheet fixing block 4 and the end of the expansion positioning pin 1 away from the pin sheet fixing block 4 is smaller than the thickness of the end plate, so that the expansion positioning pin 1 does not affect the assembly process of the battery module.

[0037] See also Figure 3As shown, in some optional embodiments, each of the expansion pieces 11 includes a connecting seat 114 and a short piece 115 fixed to the connecting seat, the connecting seat 114 is fixed to one end of the short piece 115 close to the expansion drive member 2, and the connecting seat 114 protrudes toward the side away from the through hole. In the embodiment of the present application, the short piece 115 and the connecting seat 114 can be integrally formed. When multiple expansion pieces 11 surround the expansion positioning pin 1, the diameter of the column surrounded by the connecting seat 114 is larger than that of the short piece 115. The enclosed cylinder has a large diameter; the elastic reset member 7 is arranged around the outer periphery of the multiple connecting seats 114. At this time, the connecting seat 114 can be accommodated in the accommodating groove 42 of the pin piece fixing block 4 together with the elastic reset member 7, which can effectively prevent the expansion piece 11 from falling out from the end of the pin hole 41 away from the accommodating groove 42, and the elastic reset member 7 is arranged around the outer periphery of the multiple connecting seats 114 to help the multiple expanded connecting seats to reset. Since the short piece 115 is integrally formed with the connecting seat 114, it also helps the multiple short pieces 115 to be reset.

[0038] See also Figure 4 As shown, in some optional embodiments, the outer side of the expansion piece 11 is provided with a wear groove 113, the depth of the wear groove 113 can be set to 1mm, and the wear groove 113 extends along the axial direction of the expansion piece 11. When the expansion piece 11 is repeatedly inserted into the end plate hole, friction will occur with the side wall of the end plate hole. If the friction frequency increases, the expansion piece 11 may be worn. At this time, the wear groove 113 can make it easy for staff to observe the wear of each expansion piece 11. When the wear groove 113 is rubbed to the same plane as other positions of the expansion piece 11, the expansion piece 11 needs to be replaced in time. Preferably, the wear groove 113 extends from one end of the expansion piece 11 to the other end. Furthermore, a more colorful pigment can be applied to the wear groove 113, so that the wear of the expansion piece 11 can be judged more intuitively.

[0039] In some optional embodiments, one end of the expansion piece 11 is provided with a guide section 112, and the guide section 112 is inclined from the side close to the expansion drive member 2 to the side away from the expansion drive member 2 toward the side close to the wear groove 113, so that the diameter surrounded by the guide sections 112 of all expansion pieces 11 is smaller than the diameter of the remaining positions. In the embodiment of the present application, the expansion positioning pin 1 surrounded by the expansion piece 11 can be regarded as having a chamfered section 12 and a vertical section 13 fixed to the chamfered section 12. The diameters of the vertical section 13 at each length position are the same, and the diameters of the chamfered section 12 at each length position are different. The diameter of the side of the chamfered section 12 close to the vertical section 13 is the largest. When the expansion positioning pin 1 needs to be inserted into the end plate hole, the end of the chamfered section 12 away from the vertical section 13 enters the end plate hole first. Since the end of the chamfered section 12 away from the vertical section 13 has a smaller diameter, the process of the expansion positioning pin 1 extending into the end plate hole can be guided, so that the expansion positioning pin 1 can be more accurately positioned with the end plate hole.

[0040] In some optional embodiments, the positioning device further includes a driving mechanism 5, which is fixed to the expansion drive member 2, and the driving mechanism 5 drives the expansion drive member 2 to move toward or away from the expansion positioning pin 1. In the embodiment of the present application, the direction and angle in which the driving mechanism 5 drives the expansion drive member 2 to move can be set. When the expansion drive member 2 needs to be inserted into the through-hole 111 surrounded by the expansion sheet 11, the expansion drive member 2 can be quickly and accurately inserted into the through-hole 111 under the drive of the driving mechanism 5. In some other embodiments, the staff can also manually insert the expansion drive member 2 into the through-hole 111 surrounded by the expansion sheet 11.

[0041] In some optional embodiments, the expansion drive member 2 is a conical structure, and the diameter of the expansion drive member 2 at one end close to the expansion positioning pin 1 is smaller than the diameter of the expansion drive member 2 at one end away from the expansion positioning pin 1. In the embodiment of the present application, the expansion drive member 2 has different diameters at different locations along its length. In some other embodiments, the expansion drive member 2 can also be configured so that one section along its length has a fixed diameter, and the other section close to the expansion positioning pin 1 has a conical structure, or the expansion drive member 2 can also be an elliptical cone imitating an end plate hole. By providing a conical structure, not only can the end of the expansion drive member 2 have a guiding function when extending into the through-hole 111, but also as the expansion drive member 2 gradually extends into the through-hole 111, the expansion positioning pin 1 can expand to different sizes to accommodate end plate holes of various inner diameters, so that the positioning device can adapt to more end plate holes of different sizes.

[0042] See also Figure 2As shown, in some optional embodiments, the positioning device also includes a fixed platform 6, the fixed platform 6 is provided with a movable hole 61, the fixed platform 6 can be connected to the pin piece fixing block 4, and the connection method includes but is not limited to a threaded connection. At this time, the movable hole 61 is connected to the accommodating groove 42 and the pin hole 41; the driving mechanism 5 includes a handle 51 and a connecting rod 52 hinged to the handle 51 at one end. The handle 51 can be directly connected to the connecting rod 52, and a hinge section 53 can be provided at one end of the handle 51. The handle 51 is indirectly connected to the connecting rod 52 through the hinge section 53, and the other end of the connecting rod 52 is hinged to the fixed platform 6, and the handle 51 is hinged to the expansion drive member 2. Similarly, the handle 51 can be directly connected to the expansion drive member 2. The driving member 2 is fixed, or it can be indirectly connected to the expansion driving member 2 through the hinge section 53. In some other embodiments, the handle 51 or the hinge section 53 can also be connected to the through rod 54 and hinged to the through rod. The expansion driving member 2 is fixed in the through rod 54 at this time. The driving mechanism 5 in the embodiment of the present application can adopt a principle similar to that of a quick clamp. When the handle 51 is pressed down, the handle 51 drives the expansion driving member 2 to move toward the side close to the expansion positioning pin 1, so that the expansion driving member 2 drives the expansion positioning pin 1 to expand. When the handle 51 is lifted, the handle 51 drives the expansion driving member to move toward the side away from the expansion positioning pin 1, and the expansion positioning pin 1 contracts.

[0043] The working principle of the embodiment of the present application may be:

[0044] Place the end plate into the tray of the processing position and align the end plate hole with the preset position. Press the handle 51 down quickly and drive the expansion drive member 2 to rise. As the expansion drive member 2 gradually extends into the hole 111, the degree of opening of each expansion piece 11 gradually increases until the outer side of each expansion piece 11 abuts against the inner wall of the end plate hole. Stop pressing the handle 51. Each expansion piece 11 penetrates the end plate hole from the bottom of the end plate, but does not pass through the top surface of the end plate. Thereafter, the fixed end plate pressing block required for the assembly of the battery module is used to support the end plate, and then battery cells, buffer pads and other items are stacked in the tray. Pressurize the movable end. After the module assembly is completed and enters the welding room for welding or tied with a strap, loosen the clamp and lift the handle 51 to drive the expansion drive member 2 to extend out of the hole 111, and the battery module can be taken out.

[0045] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0046] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0047] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A positioning device, characterized in that: It includes: An expansion positioning pin (1), wherein an elastic reset member (7) is provided on the outer periphery of the expansion positioning pin (1); An expansion drive member (2), wherein the expansion drive member (2) extends axially along the expansion positioning pin (1), and the expansion drive member (2) is configured such that when the expansion drive member (2) moves toward a direction approaching the expansion positioning pin (1), the expansion drive member (2) drives the expansion positioning pin (1) to expand, and when the expansion drive member (2) moves toward a direction away from the expansion positioning pin (1), the expansion positioning pin (1) contracts.

2. The positioning device according to claim 1, wherein: The expansion positioning pin (1) includes a plurality of expansion pieces (11), the plurality of expansion pieces (11) are distributed along the circumferential direction of the expansion positioning pin (1), and the elastic reset member (7) is arranged around the outer circumference of the plurality of expansion pieces (11), the plurality of expansion pieces (11) form a through-hole (111), and the expansion driving member (2) is arranged through the through-hole (111).

3. The positioning device according to claim 2, wherein: The elastic reset member (7) is arranged around one end of the expansion piece (11) close to the expansion drive member (2).

4. The positioning device according to claim 3, wherein: The positioning device further comprises a pin piece fixing block (4), the pin piece fixing block (4) having a pin hole (41), and the plurality of expansion pieces (11) are all inserted into the pin hole (41); The pin piece fixing block (4) is further provided with a receiving groove (42), the receiving groove (42) is communicated with the pin hole (41), and the elastic reset member (7) is installed in the receiving groove (42).

5. The positioning device according to claim 3, wherein: Each expansion piece (11) comprises a connecting seat (114) and a short piece (115) fixed to the connecting seat (114), wherein the connecting seat (114) is fixed to an end of the short piece (115) close to the expansion driving member (2), and the connecting seat (114) protrudes toward a side away from the through hole (111); The elastic reset member (7) is arranged around the outer periphery of the plurality of connecting seats (114).

6. The positioning device according to claim 2, wherein: The outer sides of the expansion pieces (11) are each provided with a wear groove (113), and the wear groove (113) extends along the axial direction of the expansion piece (11).

7. The positioning device according to claim 6, wherein: One end of each expansion piece (11) is provided with a guide section (112).

8. The positioning device according to claim 1, wherein: The positioning device further comprises a driving mechanism (5), the driving mechanism (5) being fixed to the expansion driving member (2), and the driving mechanism (5) driving the expansion driving member (2) to move in a direction close to or away from the expansion positioning pin (1).

9. The positioning device according to claim 8, wherein: The expansion drive member (2) is a cone structure, and the diameter of the expansion drive member (2) at one end close to the expansion positioning pin (1) is smaller than the diameter of the expansion drive member (2) at one end away from the expansion positioning pin (1).

10. The positioning device according to claim 8, wherein: The positioning device further comprises a fixing platform (6), wherein the fixing platform (6) is provided with a movable hole (61); The driving mechanism (5) includes a handle (51) and a connecting rod (52) with one end hinged to the handle (51), the other end of the connecting rod (52) is hinged to the fixed platform (6), and the handle (51) is hinged to the expansion driving member (2). When the handle (51) is pressed down, the handle (51) drives the expansion driving member (2) to move toward the side close to the expansion positioning pin (1), so that the expansion driving member (2) drives the expansion positioning pin (1) to expand. When the handle (51) is lifted, the handle (51) drives the expansion driving member (2) to move toward the side away from the expansion positioning pin (1), and the expansion positioning pin (1) contracts.

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