Positioning device

Abstract

A positioning device comprises: a base; the driving assembly comprises a cylinder body and a piston piece, the cylinder body is connected with the base and provided with an air inlet groove communicated with an external air source, and the piston piece abuts against the groove wall of the air inlet groove in an airtight mode and is provided with a penetrating groove, a limiting groove and an arc-shaped abutting face; the bearing assembly comprises a connecting piece which is connected with the cylinder body and is provided with a containing groove, a bearing piece which is connected with the connecting piece and is used for bearing a workpiece, and a rolling piece which is rotatably arranged in the containing groove and convexly extends to the limiting groove; the positioning assembly comprises a supporting piece arranged on the base and arranged on the piston piece in a sleeving mode, and a positioning piece movably arranged on the supporting piece in a penetrating mode in the horizontal direction and connected to the arc-shaped abutting face in an abutting mode. A piston piece in the positioning device is driven by an external air source and spirally moves downwards in the preset direction under matched limiting of a rolling piece and a limiting groove, the positioning piece stretches out of a supporting piece under abutting and pushing of an arc-shaped abutting and pushing face, and the supporting piece drives the positioning piece to pull downwards and position a workpiece to a bearing piece under abutting and pressing of the piston piece. And the quality and the positioning efficiency of the workpiece are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of positioning equipment, in particular to a positioning device. Background Art

[0002] Nowadays, hot forging, slurry forming, powder metallurgy and other processes are usually used to form metal blanks to improve the mechanical properties of metal blanks and thus increase the utilization rate of metal blanks. However, after forming, metal blanks have the characteristics of thin walls, special shapes, weak structural strength and easy deformation, which makes it difficult for operators to quickly clamp and position metal blanks with special structures, reducing positioning efficiency and easily causing the metal blanks to deform again, thereby reducing the quality of the metal blanks. Utility Model Content

[0003] In view of the above situation, it is necessary to provide a positioning device to improve the positioning efficiency and workpiece quality.

[0004] The embodiment of the present application provides a positioning device, comprising: a base; a driving assembly, comprising a cylinder body and a piston member, the cylinder body being connected to the base and provided with an air inlet groove connected to an external air source, one end of the piston member being airtightly abutted against the air inlet groove, the other end of the piston member extending out of the air inlet groove and being provided with a through groove and a limiting groove, the through groove penetrating through both sides of the piston member in a vertical direction, the limiting groove being obliquely arranged at the groove wall of the through groove, an arc-shaped abutting surface being arranged on the outer peripheral side of the end portion of the piston member away from the cylinder body, and the piston member moving closer to the base under the action of the external air source; a bearing assembly, comprising a connecting member, a bearing member and a rolling member, the connecting member being passed through the through groove and connected to the cylinder body, and the connecting member being provided with a containing groove facing the side wall of the limiting groove, the bearing member and the working The cam is adapted to and connected with an end of the connecting member away from the cylinder body, the supporting member is used to support the workpiece, the rolling member is rotatably arranged in the accommodating groove and protrudes to the limiting groove, the rolling member is used to cooperate with the limiting groove to limit the movement direction of the piston member so that the piston member can move downward in a spiral along a preset direction; and a positioning assembly, including a supporting member and a positioning member, the supporting member is arranged on the base and sleeved on the piston member, the positioning member is movably passed through the supporting member in the horizontal direction and abuts against the arc-shaped pushing surface, the positioning member extends out of the supporting member under the pushing of the arc-shaped pushing surface to abut against the bottom of the inner cavity of the workpiece, and the supporting member is used to drive the positioning member to move downward under the pressure of the piston member, so that the positioning member positions the workpiece to the supporting member.

[0005] In the above-mentioned positioning device, when the piston moves close to the base under the action of an external gas source, the piston can move downward in a spiral along a preset direction under the cooperation of the rolling member and the limiting groove, so that the positioning member extends out of the supporting member under the push of the arc-shaped pushing surface and abuts against the bottom of the inner cavity of the workpiece. At the same time, the supporting member drives the positioning member to move downward under the pressure of the piston member, so that the positioning member pulls the workpiece down to the supporting member, avoiding deformation of the workpiece during the positioning process and allowing the workpiece that is compatible with the workpiece to correct the deformed structural part of the workpiece, thereby improving the quality of the workpiece, and then realizing rapid positioning of the workpiece to the supporting member, thereby improving the positioning efficiency.

[0006] In some embodiments, the support member is provided with interconnected pressure grooves and receiving grooves in sequence along the direction from the cylinder body to the base, the pressure grooves and the receiving grooves receive the piston member and the cylinder body respectively, and the notch area of ​​the pressure groove is larger than the notch area of ​​the receiving groove.

[0007] In some embodiments, the distance between the arc-shaped pushing surface and the groove wall of the pressing groove gradually increases along the rotation direction of the piston member.

[0008] In some embodiments, the piston member is also provided with a receiving groove adapted to the rolling member, the receiving groove is arranged in a vertical direction and is connected to one end of the limiting groove adjacent to the supporting member, and the receiving groove is used to accommodate the rolling member to limit the piston member when the positioning member positions the workpiece to the supporting member.

[0009] In some embodiments, the positioning member includes: a positioning portion, which is movably arranged in the horizontal direction through the support member and abuts against the arc-shaped pushing surface, the positioning portion is provided with a mounting groove in the horizontal direction, and the positioning portion is used to position the workpiece; a limiting portion, one end of the limiting portion is connected to the support member, and the other end of the limiting portion extends into the mounting groove; and an elastic portion, which is respectively connected to the limiting portion and the positioning portion, and the elastic portion is used to provide elastic force and drive the positioning portion to reset.

[0010] In some embodiments, the positioning portion includes a sliding body and a positioning body, one end of the sliding body abuts against the arc-shaped pushing surface, the other end of the sliding body is movably inserted into the support member and connected to the elastic portion, the positioning body is connected to one end of the sliding body away from the piston member and is used to position the workpiece, and the cross-sectional area of ​​the positioning body is smaller than the cross-sectional area of ​​the sliding body.

[0011] In some embodiments, the positioning assembly further includes: a guide member, which is vertically inserted into the support member and connected to the base, and the guide member is used to guide the movement direction of the support member.

[0012] In some embodiments, the positioning assembly further includes: a bushing member embedded in the support member and sleeved on the guide member.

[0013] In some embodiments, the piston member is provided with a plurality of the arcuate push surfaces, and the plurality of the arcuate push surfaces are arranged at equal intervals along the circumference of the piston member; the number of the positioning members is multiple, and the plurality of the positioning members are arranged one-to-one corresponding to the plurality of the arcuate push surfaces and are all movably arranged in the support member.

[0014] In some embodiments, the driving assembly further includes: a sealing member, which is sleeved on the piston member and abuts against a groove wall of the air inlet groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a positioning device and a workpiece adapted thereto provided in an embodiment of the present application.

[0016] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the workpiece shown.

[0017] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the positioning device.

[0018] Figure 4 for Figure 1 The shown positioning device and the adapted workpiece are schematic cross-sectional views along the IV-IV direction.

[0019] Figure 5 for Figure 1 A schematic diagram of the structural decomposition of the positioning device shown.

[0020] Figure 6 for Figure 5 The three-dimensional structural schematic diagram of the piston component is shown.

[0021] Figure 7 for Figure 5 A schematic diagram of the structural decomposition of the positioning member is shown.

[0022] Main component symbols

[0023] Positioning device 100

[0024] Base 10

[0025] Drive assembly 20

[0026] Cylinder 21

[0027] Air intake slot 211

[0028] Piston 22

[0029] Through groove 221

[0030] Limiting slot 222

[0031] Arc-shaped push surface 223

[0032] Accommodation slot 224

[0033] Seal 23

[0034] Carrying assembly 30

[0035] Connector 31

[0036] Accommodating groove 311

[0037] Carrier 32

[0038] Rolling element 33

[0039] Positioning component 40

[0040] Support member 41

[0041] Pressure groove 411

[0042] Storage slot 412

[0043] Positioning piece 42

[0044] Positioning unit 421

[0045] Mounting slot 4211

[0046] Sliding body 4212

[0047] Positioning body 4213

[0048] Limiting portion 422

[0049] Elastic portion 423

[0050] Guide 43

[0051] Bushing kit 44

[0052] Workpiece 200

[0053] Lumen 201 DETAILED DESCRIPTION

[0054] 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.

[0055] 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 accompanying 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, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. 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.

[0056] In the description of this 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 an indirect connection 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 specific circumstances.

[0057] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0058] See also Figure 1 , the present application embodiment provides a positioning device 100 for positioning a workpiece 200. Figure 2 , wherein the workpiece 200 is substantially disc-shaped, and an inner cavity 201 is provided on one side thereof. Figure 3 and Figure 4 The positioning device 100 includes a base 10 , a driving assembly 20 , a bearing assembly 30 and a positioning assembly 40 .

[0059] See also Figure 4 , Figure 5 and Figure 6The driving assembly 20 includes a cylinder body 21 and a piston member 22. The cylinder body 21 is connected to the base 10 and is provided with an air inlet groove 211 connected to an external air source. One end of the piston member 22 is airtightly abutted against the air inlet groove 211, and the other end of the piston member 22 extends out of the air inlet groove 211 and is provided with a through groove 221 and a limiting groove 222. The through groove 221 penetrates both sides of the piston member 22 in a vertical direction, and the limiting groove 222 is obliquely arranged at the groove wall of the through groove 221. An arc-shaped push surface 223 is provided on the outer peripheral side of the end of the piston member 22 away from the cylinder body 21. The piston member 22 moves close to the base 10 under the action of the external air source. The bearing assembly 30 includes a connecting member 31, a bearing member 32 and a rolling member 33. The connecting member 31 is inserted into the through groove 221 and connected to the cylinder body 21, and a accommodating groove 311 is provided on the side wall of the connecting member 31 facing the limiting groove 222. The bearing member 32 is connected to an end of the connecting member 31 away from the cylinder body 21 and is used to carry the workpiece 200. The rolling member 33 is rotatably disposed in the accommodating groove 311 and protrudes to the limiting groove 222. The rolling member 33 is used to cooperate with the limiting groove 222 to limit the movement direction of the piston member 22 so that the piston member 22 moves downward in a spiral along a preset direction. The positioning assembly 40 includes a support member 41 and a positioning member 42. The support member 41 is arranged on the base 10 and sleeved on the piston member 22. The positioning member 42 is movably arranged in the support member 41 in the horizontal direction and abuts against the arc-shaped abutting surface 223. The positioning member 42 extends out of the support member 41 under the abutment of the arc-shaped abutting surface 223 to abut against the bottom of the inner cavity 201 of the workpiece 200. The support member 41 is used to drive the positioning member 42 to move downward under the pressure of the piston member 22, so that the positioning member 42 positions the workpiece 200 to the bearing member 32. Exemplarily, the rolling member 33 can be a ball.

[0060] In the above-mentioned positioning device 100, when the piston member 22 moves close to the base 10 under the action of an external gas source, the piston member 22 can move downward in a spiral along a preset direction under the cooperation and limitation of the rolling member 33 and the limiting groove 222, so that the positioning member 42 extends out of the support member 41 under the push of the arc-shaped push surface 223 and abuts against the bottom of the inner cavity 201 of the workpiece 200. At the same time, the support member 41 drives the positioning member 42 to move downward under the pressure of the piston member 22, so that the positioning member 42 pulls the workpiece 200 down to the supporting member 32, thereby avoiding deformation of the workpiece 200 during the positioning process and allowing the workpiece 200 that is compatible with the workpiece 200 to correct the deformed structural parts of the workpiece 200, thereby improving the quality of the workpiece 200, and then realizing rapid positioning of the workpiece 200 to the supporting member 32, thereby improving the positioning efficiency.

[0061] See also Figure 5In some embodiments, the support member 41 is provided with interconnected pressing grooves 411 and receiving grooves 412 in sequence along the direction from the cylinder body 21 to the base 10 . The pressing grooves 411 and the receiving grooves 412 receive the piston member 22 and the cylinder body 21 , respectively, and the notch area of ​​the pressing groove 411 is larger than the notch area of ​​the receiving groove 412 .

[0062] In this way, by setting the above-mentioned pressing groove 411 and receiving groove 412 to respectively receive the piston member 22 and the cylinder body 21, when the piston member 22 moves downward in a spiral along a preset direction, the piston member 22 can contact the pressing groove 411 and press the support member 41 through the pressing groove 411 to move close to the base 10, so that the support member 41 can stably drive the positioning member 42 to pull the workpiece 200 down to the supporting member 32, thereby achieving stable positioning of the workpiece 200 to the supporting member 32 and improving the positioning stability.

[0063] See also Figure 5 and Figure 6 In some implementations, the distance between the arc-shaped push surface 223 and the groove wall of the pressing groove 411 gradually increases along the rotation direction of the piston member 22. It can be understood that in this embodiment, the piston member 22 rotates clockwise while moving downward.

[0064] In this way, when the piston member 22 moves downward in a spiral along a preset direction, the distance between the arc-shaped push surface 223 and the groove wall of the pressing groove 411 becomes smaller and smaller, so that the piston member 22 can stably push the positioning member 42 out of the support member 41 through the arc-shaped push surface 223, making it easier for the support member 41 to drive the positioning member 42 to pull the workpiece 200 down to the supporting member 32.

[0065] See also Figure 6 In some embodiments, the piston member 22 is also provided with a receiving groove 224 adapted to the rolling member 33. The receiving groove 224 is arranged in the vertical direction and is connected to one end of the limiting groove 222 adjacent to the supporting member 32. The receiving groove 224 is used to accommodate the rolling member 33 to limit the piston member 22 when the positioning member 42 positions the workpiece 200 to the supporting member 32.

[0066] In this way, when the positioning member 42 positions the workpiece 200 to the supporting member 32, the rolling member 33 is located at the tail end of the limiting groove 222. The rolling member 33 is accommodated by the accommodating groove 224 adapted to the rolling member 33, and the rolling member 33 is locked in the accommodating groove 224 to limit the piston member 22, thereby preventing the piston member 22 from being reset due to external force and causing the positioning member 42 to loosen the positioned workpiece 200, which is beneficial to ensuring the positioning stability of the positioning device 100.

[0067] See also Figure 5 and Figure 7In some embodiments, the positioning member 42 includes a positioning portion 421, a limiting portion 422 and an elastic portion 423. The positioning portion 421 is movably arranged in the horizontal direction on the support member 41 and abuts against the arc-shaped push surface 223. The positioning portion 421 is provided with a mounting groove 4211 in the horizontal direction, and the positioning portion 421 is used to position the workpiece 200. One end of the limiting portion 422 is connected to the support member 41, and the other end of the limiting portion 422 extends into the mounting groove 4211. The elastic portion 423 is respectively connected to the limiting portion 422 and the positioning portion 421, and the elastic portion 423 is used to provide elastic force and drive the positioning portion 421 to reset. Exemplarily, the elastic portion 423 can be a spring.

[0068] In this way, by setting the specific structure of the above-mentioned positioning part 421, when the positioning device 100 completes the positioning operation, the piston member 22 spirally moves upward and cancels the push of the positioning part 421 to extend the support member 41, and the elastic part 423 compressed to the limiting part 422 provides elastic force and drives the positioning part 421 to return to the initial position, so that the positioning device 100 can repeat the positioning operation.

[0069] Please continue reading Figure 7 In some embodiments, the positioning portion 421 includes a sliding body 4212 and a positioning body 4213, one end of the sliding body 4212 abuts against the arc-shaped pushing surface 223, the other end of the sliding body 4212 is movably arranged in the support member 41 and connected to the elastic portion 423, the positioning body 4213 is connected to one end of the sliding body 4212 away from the piston member 22 and is used to position the workpiece 200, and the cross-sectional area of ​​the positioning body 4213 is smaller than the cross-sectional area of ​​the sliding body 4212.

[0070] In this way, by setting the cross-sectional area of ​​the positioning body 4213 to be smaller than the cross-sectional area of ​​the sliding body 4212, the positioning body 4213 can be stably extended into the inner cavity 201 of the workpiece 200, thereby preventing the positioning body 4213 from being too large and interfering with other parts of the workpiece 200 during the process of extending the positioning body 4213 into the inner cavity 201 of the workpiece 200, which is beneficial to ensuring that the positioning part 421 stably positions the workpiece 200.

[0071] See also Figure 5 In some implementations, the positioning assembly 40 further includes a guide member 43 , which is vertically penetrated through the support member 41 and connected to the base 10 , and is used to guide the movement direction of the support member 41 .

[0072] In this way, by movably passing the guide member 43 through the support member 41, the guide member 43 can guide the movement direction of the support member 41, so that the support member 41 can stably move downward in the vertical direction under the guidance of the guide member 43, and then the positioning member 42 can stably pull the workpiece 200 down to the carrier 32, thereby improving the positioning stability.

[0073] In some embodiments, the positioning assembly 40 further includes a bushing 44, which is embedded in the support member 41 and sleeved on the guide member 43. Exemplarily, the bushing 44 may be an oil-free bushing.

[0074] In this way, by setting the above-mentioned bushing member 44 to be sleeved on the guide member 43, the support member 41 can be driven by the piston member 22 to move downward stably, preventing the direct contact friction between the guide member 43 and the support member 41 from being too large, causing the support member 41 to be unable to move downward, thereby improving the movement stability of the support member 41.

[0075] See also Figure 5 and Figure 6 In some embodiments, the piston member 22 is provided with a plurality of arcuate push surfaces 223, and the plurality of arcuate push surfaces 223 are arranged at equal intervals along the circumference of the piston member 22. There are a plurality of positioning members 42, and the plurality of positioning members 42 are arranged one by one corresponding to the plurality of arcuate push surfaces 223 and are all movably arranged on the support member 41.

[0076] In this way, by providing multiple arc-shaped push surfaces 223 and multiple positioning members 42, the piston member 22 can push the corresponding positioning members 42 out of the support member 41 through the multiple arc-shaped push surfaces 223, so that the multiple positioning members 42 are simultaneously abutted against the bottom of the inner cavity 201 of the workpiece 200, thereby increasing the contact area between the positioning component 40 and the workpiece 200, which is beneficial to improving the positioning stability of the positioning component 40.

[0077] See also Figure 5 In some embodiments, the driving assembly 20 further includes a sealing member 23, which is sleeved on the piston member 22 and abuts against the groove wall of the air inlet groove 211. Exemplarily, the sealing member 23 may be a sealing ring.

[0078] In this way, by setting the above-mentioned sealing member 23 to abut against the groove wall of the air inlet groove 211, the sealing member 23 maintains the sealed environment of the air inlet groove 211, avoiding the gas provided by the external air source from leaking from the abutment between the piston member 22 and the groove wall of the air inlet groove 211, which is conducive to the external air source to stably drive the piston member 22 to move through the air inlet groove 211.

[0079] The working process of the positioning device 100 is roughly as follows:

[0080] First, the workpiece 200 is placed on the carrier 32, and the piston 22 moves toward the base 10 under the action of an external gas source;

[0081] Then, the piston member 22 moves downward in a spiral along a preset direction under the cooperation of the rolling member 33 and the limiting groove 222, and the distance between the arc-shaped pushing surface 223 and the groove wall of the pressing groove 411 becomes smaller and smaller, so that the positioning portion 421 extends out of the support member 41 under the pushing of the arc-shaped pushing surface 223 and abuts against the bottom of the inner cavity 201 of the workpiece 200, and the elastic portion 423 is compressed to the limiting portion 422 by the positioning portion 421. At the same time, the support member 41 drives the positioning member 42 to move downward under the pressure of the piston member 22 and the limiting of the guide member 43, so that the positioning member 42 pulls the workpiece 200 down to the carrier 32, avoids the deformation of the workpiece 200 during the positioning process, and enables the workpiece 200 that is compatible with the workpiece 200 to correct the deformed position of the workpiece 200, thereby improving the quality of the workpiece 200, and then quickly positioning the workpiece 200 to the carrier 32, thereby improving the positioning efficiency;

[0082] Finally, when the workpiece 200 is processed, the piston member 22 moves away from the base 10 under the action of the external air source, and the piston member 22 spirally moves upward in the direction opposite to the preset direction with the cooperation of the rolling member 33 and the limiting groove 222 and cancels the push positioning portion 421, and the compressed elastic portion 423 drives the positioning portion 421 to reset and retract into the support member 41, so that the positioning device 100 can take away the processed workpiece 200 and repeat the positioning of the workpiece 200 to be processed.

[0083] 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: Pedestal; A drive assembly, comprising a cylinder body and a piston member, wherein the cylinder body is connected to the base and is provided with an air inlet groove connected to an external air source, one end of the piston member is airtightly abutted against the air inlet groove, and the other end of the piston member extends out of the air inlet groove and is provided with a through groove and a limit groove, wherein the through groove passes through both sides of the piston member in a vertical direction, and the limit groove is obliquely arranged at the groove wall of the through groove, and an arc-shaped push surface is provided on the outer peripheral side of the end of the piston member away from the cylinder body, and the piston member moves close to the base under the action of the external air source; A bearing assembly, comprising a connecting member, a bearing member and a rolling member, wherein the connecting member is inserted into the through groove and connected to the cylinder body, and a receiving groove is provided on the side wall of the connecting member facing the limiting groove, the bearing member is adapted to the workpiece and connected to an end of the connecting member away from the cylinder body, the bearing member is used to bear the workpiece, the rolling member is rotatably disposed in the receiving groove and protrudes to the limiting groove, and the rolling member is used to cooperate with the limiting groove to limit the movement direction of the piston member, so that the piston member moves downward in a spiral along a preset direction; and The positioning assembly includes a support member and a positioning member, wherein the support member is arranged on the base and sleeved on the piston member, the positioning member is movably arranged in the horizontal direction through the support member and abuts against the arc-shaped pushing surface, and the positioning member extends out of the support member under the pushing of the arc-shaped pushing surface to abut against the bottom of the inner cavity of the workpiece, and the support member is used to drive the positioning member to move downward under the pressure of the piston member so that the positioning member positions the workpiece to the supporting member.

2. The positioning device according to claim 1, characterized in that The support member is provided with interconnected pressing grooves and receiving grooves in sequence along the direction from the cylinder body to the base. The pressing grooves and the receiving grooves receive the piston member and the cylinder body respectively, and the notch area of ​​the pressing grooves is larger than the notch area of ​​the receiving grooves.

3. The positioning device according to claim 2, characterized in that: The distance between the arc-shaped push surface and the groove wall of the pressing groove gradually increases along the rotation direction of the piston member.

4. The positioning device according to claim 1, characterized in that: The piston member is also provided with a receiving groove adapted to the rolling member, the receiving groove is arranged in the vertical direction and is connected with one end of the limiting groove adjacent to the supporting member, and the receiving groove is used to accommodate the rolling member to limit the piston member when the positioning member positions the workpiece to the supporting member.

5. The positioning device according to claim 1, characterized in that: The positioning member comprises: A positioning part, movably arranged in the horizontal direction through the support member and abutting against the arc-shaped abutting surface, the positioning part is provided with a mounting groove in the horizontal direction, and the positioning part is used to position the workpiece; a limiting portion, one end of which is connected to the supporting member, and the other end of which extends into the mounting groove; and The elastic part is connected to the limiting part and the positioning part respectively, and the elastic part is used to provide elastic force and drive the positioning part to reset.

6. The positioning device according to claim 5, characterized in that: The positioning portion includes a sliding body and a positioning body, one end of the sliding body abuts against the arc-shaped pushing surface, the other end of the sliding body is movably inserted into the supporting member and connected to the elastic portion, the positioning body is connected to one end of the sliding body away from the piston member and is used to position the workpiece, and the cross-sectional area of ​​the positioning body is smaller than the cross-sectional area of ​​the sliding body.

7. The positioning device according to claim 1, characterized in that: The positioning component also includes: A guide member is vertically arranged in the support member and connected to the base, and the guide member is used to guide the movement direction of the support member.

8. The positioning device according to claim 7, characterized in that: The positioning component also includes: A lining member is embedded in the support member and sleeved on the guide member.

9. The positioning device according to claim 1, characterized in that: The piston member is provided with a plurality of arc-shaped push surfaces, and the plurality of arc-shaped push surfaces are arranged at equal intervals along the circumference of the piston member; There are multiple positioning members, and the multiple positioning members are arranged in one-to-one correspondence with the multiple arc-shaped push surfaces and are all movably inserted into the support member.

10. The positioning device according to claim 1, characterized in that: The drive assembly also includes: A sealing member is sleeved on the piston member and abuts against a groove wall of the air inlet groove.

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