Positioning device

Abstract

A positioning device comprises a lower cover plate used for supporting a workpiece, the lower cover plate is provided with a positioning column, and the positioning column is provided with a positioning groove; the upper cover plate is used for being matched with the lower cover plate to clamp and position a workpiece, the upper cover plate comprises a cover plate body and a locking mechanism, the cover plate body is provided with a first through hole, the locking mechanism is arranged on the side, away from the lower cover plate, of the upper cover plate and comprises a supporting piece and a plurality of abutting assemblies, and the supporting piece is connected with the cover plate body and provided with a second through hole; the multiple abutting assemblies are elastically arranged in the supporting piece, when the cover plate body covers the lower cover plate, the positioning columns are inserted into the first through holes and the second through holes, and the abutting assemblies abut against the positioning grooves so as to position the cover plate body. The unlocking paw comprises a connecting plate and an unlocking piece, a first containing groove is formed in the unlocking piece, and the unlocking piece is used for being inserted into the second through hole to push the abutting assembly to be away from the positioning column, so that the lower cover plate is separated from the upper cover plate. The positioning device can accurately position the product and is low in cost.

Description

Technical Field

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

[0002] When processing products, it is necessary to use jigs such as covers to hold and position the products. In order to increase the stability of positioning, cylinders and other devices are usually used to hold the covers, or suction cups are used to adsorb and position the covers. However, whether a cylinder is used to hold the covers or a suction cup is used to adsorb the covers, various hardware such as air sources, air conditioning components, air pipes, joints, etc. are required, which makes the cost of the jigs relatively high. Utility Model Content

[0003] In view of the above, it is necessary to propose a positioning device that can accurately position the product with low cost.

[0004] The embodiment of the present application provides a positioning device, comprising: a lower cover plate for supporting a workpiece, a positioning column is provided on one side of the lower cover plate for abutting against the workpiece, and a positioning groove is provided on the side wall of the positioning column; an upper cover plate is used to cooperate with the lower cover plate to clamp and position the workpiece, the upper cover plate comprises a cover plate body and a locking mechanism, the cover plate body is provided with a first through hole corresponding to the positioning column, the locking mechanism is arranged on a side of the cover plate body away from the lower cover plate, the locking mechanism comprises a support member and a plurality of abutting components, the support member is connected to the cover plate body and is provided with a second through hole connected to the first through hole, The plurality of abutting components are elastically arranged in the supporting member and are centrally symmetrically arranged along the axis of the second through hole, the positioning column is inserted into the first through hole and the second through hole when the cover plate body covers the lower cover plate, and the abutting component abuts against the positioning groove to position the cover plate body; and an unlocking claw, comprising a connecting plate and an unlocking member connected to the connecting plate, a first accommodating groove for accommodating the positioning column is provided at one end of the unlocking member away from the connecting plate, and the unlocking member is used to be inserted into the second through hole to push the abutting component away from the positioning column, thereby separating the lower cover plate from the upper cover plate.

[0005] The above positioning device can support the workpiece through the lower cover plate, and can clamp and position the workpiece by covering the upper cover plate on the lower cover plate. When the upper cover plate covers the lower cover plate, the positioning column is inserted into the first through hole in the upper cover plate and the second through hole in the support member, and the abutting component in the locking mechanism abuts in the positioning groove on the positioning column to clamp the positioning column, thereby realizing the clamping of the upper cover plate and the lower cover plate, and improving the stability of the upper cover plate and the lower cover plate when positioning the workpiece. When disassembling, the unlocking member in the unlocking claw is inserted into the second through hole, the first receiving groove of the unlocking member accommodates the positioning column, and the unlocking member pushes the abutting component away from the positioning groove, thereby causing the abutting component to release the positioning column, which is convenient for disassembling the upper cover plate and the lower cover plate. The above positioning device can position the workpiece through the cooperation of the upper cover plate and the lower cover plate, and the positioning effect is good. The upper cover plate and the lower cover plate can be locked through the cooperation of the locking mechanism and the positioning column, and no additional device is required, and the cost is low.

[0006] In some embodiments, the supporting component includes a ball, an elastic member and a fixing member, a plurality of sliding grooves are opened in the supporting member, the fixing member is connected to the supporting member and corresponds to the sliding grooves, the elastic member is arranged in the sliding grooves and abuts against the fixing member, the ball is connected to one end of the elastic member away from the fixing member, and the elastic member is used to elastically push the ball to move toward the axis of the second through hole.

[0007] In some embodiments, a second receiving groove is formed at one end of the fixing member abutting against the elastic member, the second receiving groove is used to receive one end of the elastic member and limit the elastic member, and the ball is fixedly connected to the elastic member.

[0008] In some embodiments, the upper cover plate also includes a moving handle, which is arranged on the side of the cover plate body facing away from the lower cover plate, and the unlocking claw also includes a clamping assembly, which includes a driving member connected to the connecting plate and two clamping fingers connected to the driving member, the unlocking member and the two clamping fingers are located on the same side of the connecting plate, and the driving member is used to drive the two clamping fingers to move closer to or away from each other to clamp the moving handle.

[0009] In some embodiments, the distance between one end of the clamping finger away from the connecting plate and the connecting plate is smaller than the length of the unlocking member, so that the unlocking member is inserted into the second through hole when the clamping finger clamps the moving handle.

[0010] In some embodiments, a flexible member is disposed on each side of the two clamping fingers that are close to each other, and the flexible member is used to flexibly abut against the moving handle.

[0011] In some embodiments, a limiting protrusion is provided at one end of the movable handle away from the cover body, and a clamping protrusion is provided on the side of the flexible member for contacting the movable handle, and the clamping protrusion is used to be clamped on the limiting protrusion when the clamping fingers clamp the movable handle.

[0012] In some embodiments, the cross-section of the movable handle is square, and when the two clamping fingers clamp two opposite sides of the movable handle, the unlocking member is inserted into the second through hole, and when the two clamping fingers clamp the other two opposite sides of the movable handle, the unlocking member is away from the supporting member.

[0013] In some embodiments, a first conical surface is provided at one end of the positioning column away from the lower cover plate, the first conical surface is arranged around the axis of the positioning column, and the first conical surface gradually approaches the axis of the positioning column in a direction away from the lower cover plate.

[0014] In some embodiments, a second conical surface is provided at one end of the unlocking member away from the connecting plate, the second conical surface is arranged around the axis of the unlocking member, and the second conical surface gradually approaches the axis of the unlocking member in a direction away from the connecting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a positioning device provided in an embodiment of the present application.

[0016] Figure 2 for Figure 1 A schematic diagram of the structure of the lower cover plate and the upper cover plate in the positioning device shown.

[0017] Figure 3 for Figure 1 A schematic diagram of the exploded structure of the lower cover plate and the upper cover plate in the positioning device is shown.

[0018] Figure 4 for Figure 3 Another perspective structural diagram of the locking mechanism is shown.

[0019] Figure 5 for Figure 1 A schematic diagram of the structure of the unlocking gripper in the positioning device shown.

[0020] Figure 6 This is a schematic diagram of the structure when the unlocking claw in the positioning device provided in an embodiment of the present application is installed on the cover plate.

[0021] Main component symbols

[0022] Positioning device 100

[0023] Lower cover 10

[0024] Positioning column 11

[0025] Positioning slot 111

[0026] The first tapered surface 112

[0027] Upper cover 20

[0028] Cover body 21

[0029] First through hole 211

[0030] Locking mechanism 22

[0031] Support 221

[0032] The second through hole 2211

[0033] Slide slot 2212

[0034] Abutment component 222

[0035] Ball 2221

[0036] Elastic part 2222

[0037] Fixing parts 2223

[0038] The second receiving groove 2223a

[0039] Move handle 23

[0040] Limiting protrusion 231

[0041] Unlock gripper 30

[0042] Connecting plate 31

[0043] Unlocking piece 32

[0044] The first receiving groove 321

[0045] Second tapered surface 322

[0046] Clamping assembly 33

[0047] Driving part 331

[0048] Clamp Finger 332

[0049] Flexible parts 333

[0050] Clamping protrusion 3331

[0051] Workpiece 200 DETAILED DESCRIPTION

[0052] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0053] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 the present application. In addition, in the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0054] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" 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, an electrical connection, or mutual communication, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. Some embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0055] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0056] See also Figure 1 The embodiment of the present application provides a positioning device 100 for clamping and positioning a workpiece 200. The workpiece 200 may be a middle frame of an electronic product such as a mobile phone or a tablet. The positioning device 100 includes a lower cover plate 10, an upper cover plate 20 and an unlocking gripper 30.

[0057] Specifically, see Figure 1 , Figure 2 and Figure 3 The lower cover plate 10 is used to support the workpiece 200. A positioning column 11 is provided on one side of the lower cover plate 10 for abutting against the workpiece 200. A positioning groove 111 is provided on the side wall of the positioning column 11. The lower cover plate 10 may be a plate-shaped structure that can stably support the workpiece 200. There may be multiple positioning columns 11 on the lower cover plate 10, such as two, three, four, etc. The specific number and position may be set according to the size of the lower cover plate 10 and the structure of the workpiece 200, and are not limited here.

[0058] The upper cover plate 20 is used to cooperate with the lower cover plate 10 to clamp and position the workpiece 200. The upper cover plate 20 includes a cover plate body 21 and a locking mechanism 22. The cover plate body 21 is provided with a first through hole 211 corresponding to the positioning column 11. The locking mechanism 22 is arranged on the side of the cover plate body 21 away from the lower cover plate 10. The locking mechanism 22 includes a support member 221 and a plurality of abutting components 222. The support member 221 is connected to the cover plate body 21 and is provided with a second through hole 2211 connected to the first through hole 211. The plurality of abutting components 222 are elastically arranged in the support member 221 and are centrally symmetrically arranged along the axis of the second through hole 2211. When the cover plate body 21 covers the lower cover plate 10, the positioning column 11 is inserted into the first through hole 211 and the second through hole 2211, and the abutting component 222 abuts against the positioning groove 111 to position the cover plate body 21. The upper cover plate 20 may be a plate-like structure, which can cooperate with the lower cover plate 10 to stably clamp the workpiece 200. A plurality of first through holes 211 may be provided, and the number and position of the first through holes 211 correspond to the positioning column 11. The number and position of the locking mechanism 22 correspond to the first through holes 211, and the second through hole 2211 is connected to the first through hole 211 and is coaxially arranged. There may be two, three, four, etc. abutting components 222 in the locking mechanism 22, and the plurality of abutting components 222 are centrally symmetrically arranged along the axis of the second through hole 2211, so that when the plurality of abutting components 222 abut against the positioning column 11, the accuracy of the position of the upper cover plate 20 when covering the lower cover plate 10 can be ensured.

[0059] Please also see Figure 5 The unlocking claw 30 includes a connecting plate 31 and an unlocking member 32 connected to the connecting plate 31. The unlocking member 32 is provided with a first receiving groove 321 for receiving the positioning column 11 at one end away from the connecting plate 31. The unlocking member 32 is used to be inserted into the second through hole 2211 to push the holding component 222 away from the positioning column 11, thereby separating the lower cover 10 from the upper cover 20. The unlocking member 32 may be a columnar structure, and a plurality of unlocking members 32 may be provided, and the number and the position of the unlocking member 32 connected to the connecting plate 31 correspond to the position of the second through hole 2211 in the supporting member 221 on the upper cover 20. When unlocking, the connecting plate 31 may be driven by an external driving device (not shown), or the connecting plate 31 may be held by hand, the unlocking member 32 may be inserted into the second through hole 2211, the positioning column 11 may be inserted into the first receiving groove 321, and the unlocking member 32 may push the holding component 222 away from the positioning groove 111, thereby separating the upper cover 20 from the lower cover 10.

[0060] The positioning device 100 provided in the present application can support the workpiece 200 through the lower cover plate 10, and can clamp and position the workpiece 200 by covering the upper cover plate 20 on the lower cover plate 10. When the upper cover plate 20 covers the lower cover plate 10, the positioning column 11 is inserted into the first through hole 211 in the upper cover plate 20 and the second through hole 2211 in the support member 221, and the abutting component 222 in the locking mechanism 22 abuts against the positioning groove 111 on the positioning column 11 to clamp the positioning column 11, thereby realizing the clamping of the upper cover plate 20 and the lower cover plate 10, and improving the stability of the upper cover plate 20 and the lower cover plate 10 when positioning the workpiece 200. During disassembly, the unlocking member 32 in the unlocking claw 30 is inserted into the second through hole 2211, the first receiving groove 321 of the unlocking member 32 receives the positioning column 11, and the unlocking member 32 pushes the abutting component 222 away from the positioning groove 111, thereby causing the abutting component 222 to release the positioning column 11, so as to facilitate the separation of the upper cover plate 20 and the lower cover plate 10. The above-mentioned positioning device 100 can position the workpiece 200 through the cooperation of the upper cover plate 20 and the lower cover plate 10, and has a good positioning effect. The upper cover plate 20 and the lower cover plate 10 can be locked through the cooperation of the locking mechanism 22 and the positioning column 11, without the need for additional devices, and the cost is low.

[0061] In some embodiments, see Figure 1 , Figure 3 and Figure 4 The abutting assembly 222 includes a ball 2221, an elastic member 2222 and a fixing member 2223. A plurality of sliding grooves 2212 are provided in the supporting member 221. The fixing member 2223 is connected to the supporting member 221 and corresponds to the sliding groove 2212. The elastic member 2222 is disposed in the sliding groove 2212 and abuts against the fixing member 2223. The ball 2221 is connected to one end of the elastic member 2222 away from the fixing member 2223. The elastic member 2222 is used to elastically push the ball 2221 toward the axis of the second through hole 2211. The ball 2221 may be a steel ball, etc., the elastic member 2222 may be a spring, etc., the fixing member 2223 may be a bolt, a pin, etc., and the fixing member 2223 is detachably connected to the supporting member 221. Thus, when the upper cover 20 covers the lower cover 10 , the elastic member 2222 elastically pushes the ball 2221 to press against the positioning groove 111 on the positioning column 11 , thereby clamping the positioning column 11 and locking the lower cover 10 and the upper cover 20 .

[0062] In some embodiments, see Figure 3 and Figure 4The fixing member 2223 is provided with a second receiving groove 2223a at one end thereof abutting against the elastic member 2222. The second receiving groove 2223a is used to receive one end of the elastic member 2222 and limit the elastic member 2222. The ball 2221 is fixedly connected to the elastic member 2222. It can be understood that the axis of the second receiving groove 2223a coincides with the axis of the elastic member 2222. By providing the second receiving groove 2223a, one end of the elastic member 2222 can be received to limit the elastic member 2222 when the elastic member 2222 is compressed. The ball 2221 is fixedly connected to the elastic member 2222 to prevent the ball 2221 from falling during use.

[0063] In some embodiments, see Figure 1 , Figure 2 and Figure 3 The upper cover plate 20 further includes a moving handle 23, which is arranged on the side of the cover plate body 21 away from the lower cover plate 10. The unlocking claw 30 further includes a clamping assembly 33, which includes a driving member 331 connected to the connecting plate 31 and two clamping fingers 332 connected to the driving member 331. The unlocking member 32 and the two clamping fingers 332 are located on the same side of the connecting plate 31. The driving member 331 is used to drive the two clamping fingers 332 to move closer to or away from each other to clamp the moving handle 23. The driving member 331 can be a cylinder, etc. By setting the driving member 331, the two clamping fingers 332 can be driven to move, and then the moving handle 23 can be clamped to drive the upper cover plate 20 to move, so as to realize automatic installation or removal of the upper cover plate 20. It can be understood that when installing the upper cover 20, the driving member 331 drives the clamping finger 332 to clamp the moving handle 23, and the unlocking member 32 is staggered with the supporting member 221, so that the upper cover 20 can be moved to cover the lower cover 10, and after the abutting component 222 is clamped in the positioning groove 111, the driving member 331 drives the clamping finger 332 to release the moving handle 23. When disassembling the upper cover 20, the driving member 331 drives the clamping finger 332 to clamp the moving handle 23, and the unlocking member 32 is inserted into the second through hole 2211, so that the abutting component 222 releases the positioning column 11, and then the upper cover 20 can be removed by the driving member 331.

[0064] In some embodiments, see Figure 1 , Figure 3 and Figure 5 , the distance between the end of the clamping finger 332 away from the connecting plate 31 and the connecting plate 31 is less than the length of the unlocking member 32, so that the unlocking member 32 can be inserted into the second through hole 2211 when the clamping finger 332 clamps the moving handle 23. In this way, when removing the upper cover 20, the unlocking member 32 can be inserted into the second through hole 2211 before the clamping finger 332 clamps the moving handle 23, and then when the clamping finger 332 clamps the moving handle 23, the abutting component 222 is pushed away from the positioning column 11, so that the driving member 331 clamps the positioning column 11 to remove the upper cover 20 from the lower cover 10.

[0065] In some embodiments, see Figure 1 The two clamping fingers 332 are provided with a flexible member 333 on the side close to each other, and the flexible member 333 is used to flexibly abut the moving handle 23. The flexible member 333 can be made of materials such as eutectic. By providing the flexible member 333, it is possible to prevent the clamping fingers 332 from rigidly contacting the positioning column 11 when clamping the positioning column 11, thereby preventing the upper cover plate 20 from shifting and damaging the workpiece 200 between the upper cover plate 20 and the lower cover plate 10.

[0066] In some embodiments, see Figure 1 and Figure 5 The end of the moving handle 23 away from the cover body 21 is provided with a limiting protrusion 231, and the side of the flexible member 333 for contacting the moving handle 23 is provided with a clamping protrusion 3331, and the clamping protrusion 3331 is used to clamp the limiting protrusion 231 when the clamping finger 332 clamps the moving handle 23. It can be understood that when the flexible member 333 abuts against the moving handle 23, the clamping protrusion 3331 is located between the limiting protrusion 231 and the upper cover 20, so that when the driving member 331 clamps the positioning column 11 to move the upper cover 20, the clamping protrusion 3331 can abut against the limiting protrusion 231 to prevent the upper cover 20 from slipping.

[0067] In some embodiments, see Figure 1 , Figure 3 , Figure 5 and Figure 6 The cross section of the moving handle 23 is square, and when the two clamping fingers 332 clamp two opposite sides of the moving handle 23, the unlocking member 32 is inserted into the second through hole 2211, and when the two clamping fingers 332 clamp the other two opposite sides of the moving handle 23, the unlocking member 32 is away from the supporting member 221. In this way, when it is necessary to disassemble the upper cover 20, the unlocking member 32 is aligned with the second through hole 2211, and then the driving member 331 drives the two clamping fingers 332 to clamp the sides corresponding to the two clamping fingers 332 in this state, so that the upper cover 20 and the lower cover 10 can be separated after the unlocking member 32 is inserted into the second through hole 2211. When the upper cover 20 needs to be installed, the driving member 331 drives the two clamping fingers 332 to clamp the other two sides of the movable handle 23. When the positioning column 11 is inserted into the first through hole 211 and the second through hole 2211, the abutting assembly 222 can abut against the positioning groove 111. At this time, the unlocking member 32 is away from the supporting member 221 and will not be inserted into the second through hole 2211 during the installation process.

[0068] In some embodiments, see Figure 1 and Figure 3The first conical surface 112 is disposed at one end of the positioning column 11 away from the lower cover plate 10. The first conical surface 112 is disposed around the axis of the positioning column 11, and the first conical surface 112 gradually approaches the axis of the positioning column 11 in the direction away from the lower cover plate 10. Thus, by providing the first conical surface 112, when the upper cover plate 20 is installed on the lower cover plate 10, it is convenient for the positioning column 11 to be inserted into the first through hole 211 and the second through hole 2211, and it is also convenient for the unlocking member 32 to be sleeved on the positioning column 11.

[0069] In some embodiments, see Figure 1 and Figure 5 The unlocking member 32 is provided with a second conical surface 322 at one end away from the connecting plate 31. The second conical surface 322 is arranged around the axis of the unlocking member 32, and the second conical surface 322 gradually approaches the axis of the unlocking member 32 in a direction away from the connecting plate 31. In this way, the unlocking member 32 is conveniently inserted into the second through hole 2211.

[0070] The working process of the positioning device 100 provided in the embodiment of the present application is roughly as follows:

[0071] When positioning the workpiece 200, the workpiece 200 is placed on the lower cover 10, and the driving member 331 drives the two clamping fingers 332 to clamp the moving handle 23 and move the unlocking member 32 away from the locking mechanism 22, and then the upper cover 20 is moved to cover the lower cover 10, and the positioning column 11 is inserted into the first through hole 211 and the second through hole 2211 in sequence, and the elastic member 2222 in the supporting assembly 222 pushes the ball 2221 to be clamped in the positioning groove 111, thereby completing the fixation of the upper cover 20 and the lower cover 10, and then completing the positioning of the workpiece 200.

[0072] When removing the upper cover 20, the driving member 331 drives the two clamping fingers 332 to clamp the moving handle 23 and make the unlocking member 32 correspond to the position of the second through hole 2211, and then the unlocking member 32 is inserted into the second through hole 2211. The unlocking member 32 pushes the ball 2221 away from the positioning column 11, and then the driving member 331 drives the clamping fingers 332 to clamp the moving handle 23, and the upper cover 20 is driven to be removed from the lower cover 10 through the moving handle 23.

[0073] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A positioning device, characterized in that: include: A lower cover plate is used to support the workpiece, a side of the lower cover plate used to abut against the workpiece is provided with a positioning column, and a side wall of the positioning column is provided with a positioning groove; An upper cover plate is used to cooperate with the lower cover plate to clamp and position the workpiece, the upper cover plate includes a cover plate body and a locking mechanism, the cover plate body is provided with a first through hole corresponding to the positioning column, the locking mechanism is arranged on the side of the cover plate body away from the lower cover plate, the locking mechanism includes a support member and a plurality of abutment components, the support member is connected to the cover plate body and is provided with a second through hole communicating with the first through hole, a plurality of abutment components are elastically arranged in the support member and are centrally symmetrically arranged along the axis of the second through hole, when the cover plate body covers the lower cover plate, the positioning column is inserted into the first through hole and the second through hole, and the abutment component abuts against the positioning groove to position the cover plate body; and The unlocking claw comprises a connecting plate and an unlocking member connected to the connecting plate, wherein the unlocking member is provided with a first accommodating groove for accommodating the positioning column at one end away from the connecting plate, and the unlocking member is used to be inserted into the second through hole to push the supporting assembly away from the positioning column, thereby separating the lower cover plate from the upper cover plate.

2. The positioning device according to claim 1, characterized in that The supporting component includes a ball, an elastic member and a fixing member. A plurality of sliding grooves are provided in the supporting member. The fixing member is connected to the supporting member and corresponds to the sliding grooves. The elastic member is arranged in the sliding grooves and abuts against the fixing member. The ball is connected to one end of the elastic member away from the fixing member. The elastic member is used for elastically pushing the ball to move toward the axis of the second through hole.

3. The positioning device according to claim 2, characterized in that: A second accommodating groove is formed at one end of the fixing member abutting against the elastic member. The second accommodating groove is used to accommodate one end of the elastic member and limit the elastic member. The ball bearing is fixedly connected to the elastic member.

4. The positioning device according to claim 1, characterized in that: The upper cover plate also includes a moving handle, which is arranged on the side of the cover plate body facing away from the lower cover plate. The unlocking claw also includes a clamping assembly, which includes a driving member connected to the connecting plate and two clamping fingers connected to the driving member. The unlocking member and the two clamping fingers are located on the same side of the connecting plate, and the driving member is used to drive the two clamping fingers to move closer to or away from each other to clamp the moving handle.

5. The positioning device according to claim 4, characterized in that: The distance between one end of the clamping finger away from the connecting plate and the connecting plate is smaller than the length of the unlocking member, so that the unlocking member is inserted into the second through hole when the clamping finger clamps the moving handle.

6. The positioning device according to claim 4, characterized in that: A flexible member is provided on each side of the two clamping fingers that are close to each other, and the flexible member is used for flexibly abutting against the moving handle.

7. The positioning device according to claim 6, characterized in that: A limiting protrusion is arranged at one end of the moving handle away from the cover plate body, and a clamping protrusion is arranged on one side of the flexible member for contacting the moving handle, and the clamping protrusion is used to be clamped on the limiting protrusion when the clamping fingers clamp the moving handle.

8. The positioning device according to claim 4, characterized in that: The cross-section of the movable handle is square. When the two clamping fingers clamp two opposite sides of the movable handle, the unlocking member is inserted into the second through hole. When the two clamping fingers clamp the other two opposite sides of the movable handle, the unlocking member is away from the supporting member.

9. The positioning device according to claim 1, characterized in that: A first conical surface is arranged at one end of the positioning column away from the lower cover plate. The first conical surface is arranged around the axis of the positioning column, and the first conical surface gradually approaches the axis of the positioning column along a direction away from the lower cover plate.

10. The positioning device according to claim 1, characterized in that: A second conical surface is arranged at one end of the unlocking member away from the connecting plate. The second conical surface is arranged around the axis of the unlocking member, and the second conical surface gradually approaches the axis of the unlocking member along a direction away from the connecting plate.

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