CN214393862U - Positioning device - Google Patents

Abstract

The application discloses a positioning device, which comprises a base; each positioning mechanism comprises a positioning driving piece and a positioning piece, and the positioning driving piece drives the positioning piece to move towards the inner wall surface close to or far away from the workpiece so as to internally support or release the workpiece; and each buffer mechanism comprises a buffer part and a stopping part, the buffer part and the stopping part are arranged opposite to the positioning part, the buffer part is used for buffering the movement of the positioning part, and the stopping part is used for stopping the positioning part which moves to a preset position. When the positioning device positions the workpiece, the process is simple, rapid and accurate, the impact force of the positioning mechanism on the workpiece is reduced by adopting a plurality of buffer mechanisms, the problems that the workpiece is deformed or damaged when the workpiece is positioned in the past and the positioning is inaccurate due to over-positioning or under-positioning are solved, and meanwhile, the universality of the positioning device is improved.

Description

Positioning device

Technical Field

This application belongs to work piece frame location technical field, concretely relates to positioner.

Background

With the continuous improvement of the living standard of human beings, the requirements of people on products are higher and higher, and the updating speed of 3C products is higher and higher. The currently common workpiece frame positioning methods include the following two methods: one is external holding type positioning, and the other is internal supporting type positioning.

In the actual production process, the external holding type positioning method is simple, the design difficulty is low, but the positioning mode easily bumps, scrapes and crushes the appearance surface of the workpiece, so that the rework of the appearance surface is caused, and the cost is wasted; the inner supporting type positioning is performed by utilizing the inner side structural characteristics of the frame of the workpiece and adopting a four-side inner supporting mode, but the positioning mode easily causes the deformation or damage of the workpiece due to large impact force when the positioning mechanism is contacted with the workpiece, and the problem of inaccurate positioning due to over-positioning or under-positioning easily occurs, and simultaneously, the lower universality of one-part positioning and one-part design is caused by the difference of different styles and internal structures, so that the problems of design, cost waste and quality also exist.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a positioning device to solve the above problems.

An embodiment of the present application provides a positioning device, including:

the base is used for placing a workpiece;

the positioning driving part drives the positioning part to move towards the inner wall surface close to or far away from the workpiece so as to internally support or release the workpiece; and

the buffer mechanisms are arranged on the base, each positioning mechanism corresponds to at least one buffer mechanism, each buffer mechanism comprises a buffer part and a stopping part, the buffer parts and the stopping parts are arranged opposite to the positioning parts, the buffer parts are used for buffering the movement of the positioning parts, and the stopping parts are used for stopping the positioning parts which move to preset positions.

In some embodiments, each of the positioning members includes:

the first connecting piece is connected to the positioning driving piece;

the second connecting piece is connected to the first connecting piece; and

and the at least one positioning part is arranged on the second connecting piece, is opposite to the inner wall surface of the workpiece and is used for internally supporting or loosening the workpiece.

In some embodiments, the first connector comprises:

the first connecting part is connected to the output end of the positioning driving part; and

and the second connecting part is connected between the first connecting part and the second connecting part and is used for driving the second connecting part and the at least one positioning part to move under the driving of the positioning driving part.

In some embodiments, each of the positioning mechanisms further comprises:

the guide piece is arranged on the base; and

and the at least one guide block is in one-to-one correspondence with the at least one guide piece and is in sliding connection with the at least one guide piece, and the at least one guide block is connected to the second connecting part and used for guiding the first connecting part.

In some embodiments, the buffer member and the stopping member are disposed opposite to the second connecting portion.

In some embodiments, the base comprises:

the positioning driving piece and the buffer mechanism are fixedly arranged on the first substrate;

the second substrate is fixedly arranged on the first substrate; and

and the third substrate is fixedly arranged on one side of the second substrate, which is deviated from the first substrate, and is used for bearing the workpiece.

In some embodiments, each of the cushioning mechanisms further comprises:

the third connecting piece is arranged on the first substrate, and the buffer piece and the stopping piece are arranged on the same side of the third connecting piece.

In some embodiments, the first substrate comprises:

the first grooves are formed in the outer side face of the first substrate;

the second substrate includes:

the plurality of second grooves are formed in one side, close to the first substrate, of the second substrate; one end of the third connecting piece is fixedly arranged in the first groove, and the other end of the third connecting piece is positioned in the second groove.

In some embodiments, the base further comprises:

the at least two first limiting parts are fixedly arranged on the first substrate and used for guiding and positioning the second substrate when the second substrate is installed; and

the first fixing pieces are fixedly arranged on the first substrate and used for fixing the second substrate on the first substrate.

In some embodiments, the base further comprises:

one end of each second limiting piece is arranged on the second substrate, the other end of each second limiting piece penetrates through the third substrate and protrudes out of the third substrate, the at least two second limiting pieces protrude out of an area surrounded by the third substrate to be used for placing the workpiece, and the at least two second limiting pieces are used for guiding and positioning the third substrate when the third substrate is installed; and

and the at least two second fixing pieces are fixedly arranged on one side of the second substrate close to the third substrate, and are used for fixing the third substrate on the second substrate.

When the positioning device positions the workpiece, the process is simple, rapid and accurate, the positioning mechanism of the positioning device is buffered by adopting a plurality of buffer mechanisms, the impact force on the workpiece is reduced, the problems that the workpiece is deformed or damaged when the workpiece is positioned in the past are solved, the problem that the positioning is inaccurate due to over-positioning or under-positioning is solved, and the universality of the positioning device is improved.

Drawings

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

Fig. 2 is an exploded schematic structural diagram of a positioning device according to an embodiment of the present application.

Fig. 3 is an exploded schematic view of a positioning mechanism and a buffering mechanism according to an embodiment of the present disclosure.

Description of the main elements

Positioning device 100

Base 10

First substrate 11

First groove 112

Second substrate 12

Second recess 122

Third substrate 13

Spring washer 132

First limiting member 14

First limiting part 142

Second limiting portion 144

First fixing member 15

Second limiting member 16

Second fixing member 17

Positioning mechanism 20

Positioning drive 22

Positioning piece 24

First connecting member 242

First connection part 2422

Second connecting part 2424

Through hole 2426

Second connecting member 244

Positioning part 246

Guide 26

Guide block 28

Buffer mechanism 30

Buffer 32

Stop member 34

Third connecting member 36

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, it is to be noted that the meaning of "a plurality" is two or more unless specifically defined otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be mechanically coupled, electrically coupled, or in communication with each other, directly coupled, or indirectly coupled through intervening media, in which case they may be interconnected, or in which case they may be in an interconnecting relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

The application provides a positioner when the location work piece, the process is simple, swift, accurate, through adopting a plurality of buffer gear, has solved the location deformation that causes and has crossed location or the inaccurate problem in location when fixing a position the work piece in the past.

In the embodiment of the present application, the workpiece (not shown) is a bezel of a mobile phone. It is understood that in other embodiments, the workpiece may also be a frame of a tablet computer, a frame of a notebook computer, or other members having a frame.

Fig. 1 shows a schematic structural diagram of a positioning apparatus 100 according to an embodiment of the present application. As can be seen in fig. 1, the positioning device 100 includes at least a base 10, a plurality of positioning mechanisms 20, and a plurality of cushioning mechanisms 30.

In this embodiment, the plurality of positioning mechanisms 20 and the plurality of buffer mechanisms 30 are disposed on the base 10, and each positioning mechanism 20 is disposed corresponding to at least one buffer mechanism 30. At least part of the components or mechanisms in the positioning mechanism 20 can be replaced by components or mechanisms adapted to the workpiece, so as to enhance the versatility of the positioning device 100, and the positioning device is suitable for various processes or stations such as detection positioning, assembly positioning, welding positioning, dispensing and glue spraying positioning, Physical Vapor Deposition (PVD) plating removal positioning, and the like. According to the characteristic structure of the inner wall or the inner cavity of the workpiece, the updating requirement of the workpiece on the positioning device can be met only by replacing part of components in the positioning mechanism 20, the design period is saved, and the design work is simplified.

Fig. 2 shows an exploded schematic view of the positioning device 100 according to the embodiment of the present application. As can be seen in fig. 2, the susceptor 10 includes a first substrate 11, a second substrate 12, and a third substrate 13. The first substrate 11, the second substrate 12 and the third substrate 13 are substantially plate-shaped, and the second substrate 12 and the third substrate 13 have avoidance holes to avoid interference between the base 10 and the positioning mechanism 20 during relative movement. The positioning mechanism 20 and the buffer mechanism 30 are both fixedly arranged on the first substrate 11, the second substrate 12 is fixedly arranged on the first substrate 11, the third substrate 13 is fixedly arranged on one side of the second substrate 12 departing from the first substrate 11, and the third substrate 13 is used for bearing a workpiece.

Referring to fig. 2, the base 10 further includes a first limiting member 14, a first fixing member 15, a second limiting member 16 and a second fixing member 17, where the number of the first limiting member 14, the first fixing member 15, the second limiting member 16 and the second fixing member 17 may be one, two, three, four or more, and the number is not limited specifically. The first limiting member 14 is fixedly disposed on the first substrate 11, and the first limiting member 14 is used for guiding and positioning the second substrate 12 when the second substrate 12 is mounted; the first fixing member 15 is fixedly arranged on the first substrate 11, and the first fixing member 15 is used for fixing the second substrate 12 on the first substrate 11; one end of the second limiting piece 16 is arranged on the second substrate 12, the other end of the second limiting piece 16 passes through the third substrate 13 and protrudes out of the third substrate 13, and when the number of the second limiting pieces 16 is more than two, the region enclosed by the part, protruding out of the third substrate 13, of the second limiting piece 16 is used for placing a workpiece and can be used for pre-positioning the workpiece; the second limiting member 16 is used for guiding and positioning the third substrate 13 when the third substrate 13 is mounted; the second fixing member 17 is fixedly disposed on a side of the second substrate 12 close to the third substrate 13, and the second fixing member 17 is used for fixing the third substrate 13 on the second substrate 12.

In this embodiment, the number of the first limiting members 14 is two, and the two first limiting members are respectively and approximately disposed at two ends of one diagonal line of the first substrate 11; the number of the first fixing members 15 is four, and the first fixing members are respectively arranged at four corners of the first substrate 11. The first position-limiting member 14 generally includes a first position-limiting portion 142 and a second position-limiting portion 144, both the first position-limiting portion 142 and the second position-limiting portion 144 are generally cylindrical, and the first position-limiting portion 142 and the second position-limiting portion 144 form a stepped first position-limiting member 14; one end of the first limiting portion 142 is fixedly connected to the first substrate 11, the other end is connected to the second limiting portion 144, and one end of the second limiting portion 144 facing the second substrate 12 is substantially spherical, which is beneficial for the second limiting portion 144 to easily enter into a through hole or a blind hole corresponding to the second substrate 12 when the second substrate 12 is mounted. The first fixing member 15 is substantially cylindrical, and a threaded hole is formed in the first fixing member 15. When the second substrate 12 is mounted, the first limiting member 14 can guide the second substrate 12 to accurately position the second substrate 12 and the first substrate 11, and after the guiding, the second substrate 12 can be fixed to the first substrate 11 by the cooperation of the bolts and the first fixing member 15.

It is understood that, in other embodiments, the number of the first limiting members 14 may also be four, and the end of the second limiting member 144 facing the second substrate 12 may also be substantially an inclined surface.

In this embodiment, the number of the second limiting members 16 is eight, and the second limiting members are respectively disposed on four sides of the second substrate 12 and the third substrate 13; the number of the second fixing members 17 is two, and the two second fixing members are respectively arranged on two opposite sides of the second substrate 12. The second limiting member 16 is substantially cylindrical, and one end of the second limiting member 16 can be fixed on the second substrate 12 through a screw thread, that is, one end of the second limiting member 16 is provided with an external screw thread and passes through a corresponding through hole on the third substrate 13 to be in screw thread connection with a corresponding screw thread hole on the second substrate 12; the second fixing member 17 is substantially cylindrical and provided with a threaded cylindrical hole. When the third substrate 13 is mounted, the third substrate 13 is fixed to the second substrate 12 by the bolts and the second fixing members 17, and the plurality of second stoppers 16 penetrate the third substrate 13 and are connected to the second substrate 12.

It is understood that, in other embodiments, the second limiting member 16 may be installed first, and then the second fixing member 17 is used for fixing connection; the number of the second fixing members 17 may be four, six, or eight.

With reference to fig. 2, the base 11 further includes an elastic pad 132, and the elastic pad 132 is disposed on the third substrate 13 in a substantially annular strip shape for carrying the workpiece. The elastic pad 132 is made of a material having elasticity, such as a rubber material. The spring washer 132 cushions the workpiece during placement to prevent scratching, bumping or scratching the surface of the workpiece. It is understood that in other embodiments, the number of the elastic pads 132 may be plural, and the elastic pads are uniformly disposed on the third substrate 13.

Fig. 3 is an exploded view of the positioning mechanism 20 and the buffering mechanism 30 according to the embodiment of the present disclosure. As can be seen from fig. 2, each positioning mechanism 20 includes a positioning driving member 22 and a positioning member 24, the positioning driving member 22 and the positioning member 24 are disposed on the first substrate 11, the positioning driving member 22 has a linear telescopic function, and the positioning driving member 22 is used for driving the positioning member 24 to move toward a direction close to or away from an inner wall surface of the workpiece, so as to inwardly support or release the workpiece. The positioning element 24 includes a first connecting element 242, a second connecting element 244 and at least one positioning portion 246, the first connecting element 242 is connected to the positioning driving element 22, the second connecting element 244 is connected to the first connecting element 242, at least one positioning portion 246 is disposed on the second connecting element 244, and the positioning portion 246 protrudes out of the third substrate 13 and is disposed opposite to an inner wall surface of the workpiece for inwardly supporting or loosening the workpiece. The number of the positioning portions 246 is not particularly limited, and may be set correspondingly according to the width or length of the inner wall surface of the workpiece.

Referring to fig. 3, in the present embodiment, the first connecting element 242 includes a first connecting portion 2422 and a second connecting portion 2424. The first connection part 2422 and the second connection part 2424 are substantially plate-shaped and are connected to each other perpendicularly, a through hole 2426 is disposed on the first connection part 2422, an output end of the positioning driving element 22 passes through the through hole 2426 and is connected to the first connection part 2422, and the second connection part 2424 is connected between the first connection part 2422 and the second connection part 244 for driving the second connection part 244 and at least one positioning part 246 to move under the driving of the positioning driving element 22.

In this embodiment, the first connection part 2422 may be relatively located below the second connection part 2424 or relatively located above the second connection part 2424 according to the size and design requirement of the actual positioning apparatus 100, and the specific location is not limited.

Referring to fig. 2, in the present embodiment, the second connecting element 244 is substantially plate-shaped, and the second connecting element 244 is disposed on the second connecting portion 2424; the positioning portion 246 has a substantially folded plate-like structure, one end of the positioning portion 246 is connected to the second link 244, and the other end of the positioning portion 246 is disposed opposite to the inner wall surface of the workpiece, and is used for abutting against the inner wall surface of the workpiece.

In this embodiment, the second connecting element 244 and the second connecting element 2424 are detachably connected, and/or the positioning element 246 and the second connecting element 244 are detachably connected, that is, the second connecting element 244 and/or the positioning element 246 can be replaced, so as to enhance the versatility of the positioning device 100.

It will be appreciated that in other embodiments, only the positioning portion 246 may be replaced, as well as enhancing the versatility of the positioning device 100.

In this embodiment, the positioning driving member 22 is a one-way pneumatic module, the output is pneumatic, and the reset is based on the elastic action of the built-in spring.

It will be appreciated that in other embodiments, the positioning actuator 22 may be other power members with linear expansion and contraction functions, such as an electric expansion and contraction module.

With reference to fig. 3, in the present embodiment, each positioning mechanism 20 further includes at least one guiding element 26 and at least one guiding block 28, and the number of the guiding elements 26 and the number of the guiding blocks 28 are matched with the number of the first connecting elements 242. At least one guiding element 26 is disposed on the first substrate 11, the guiding element 26 is substantially a linear slide rail structure, and the extending direction thereof is the same as the linear extending direction of the positioning driving element 22; the guide blocks 28 are arranged in one-to-one correspondence with the guide pieces 26 and are slidably connected to the guide pieces 26, the guide blocks 28 are connected to the second connecting portions 2424, and the guide pieces 26 and the guide blocks 28 are used together for guiding the first connecting pieces 242.

In this embodiment, the number of the positioning drivers 22 is four, and the positioning drivers can move toward four inner wall surfaces of the workpiece, two guide members 26 and two guide blocks 28 can be disposed in the length direction of the first base plate 11, and one guide member 26 and one guide block 28 can be disposed in the width direction of the first base plate 11. The arrangement of the positioning driving member 22, the guide 26 and the guide block 28 is not limited to the positioning mechanism 20.

Referring to fig. 2, the plurality of buffering mechanisms 30 are disposed between the first substrate 11 and the second substrate 12, as can be seen from fig. 3, each buffering mechanism 30 includes a buffering element 32 and a stopping element 34, the buffering element 32 and the stopping element 34 are disposed opposite to the second connecting portion 2424 of the positioning element 24, when the second connecting portion 2424 moves toward the inner wall surface of the workpiece under the driving action of the positioning driving element 22, the buffering element 32 is used for buffering the movement of the positioning element 24, the stopping element 34 is used for stopping the positioning element 24 which moves to the predetermined position, and the stopping element 34 has an action of stopping the second connecting portion 2424 on the limited dimension line, so as to achieve the purpose of accurate positioning of the positioning device 100.

In this embodiment, the buffer 32 is an oil pressure buffer, the stopper 34 is a cylindrical structure with a fixed length, the length of the stopper 34 is adjustable, or the stopper 34 is replaceable. When the positioning element 24 moves towards the inner wall surface of the workpiece, the second connecting portion 2424 contacts with the buffering element 32 first, the buffering element 32 buffers the movement of the positioning element 24, and the situations of impact, scratch, bruise, scratch and the like of the positioning element 24 on the inner wall surface of the workpiece are avoided.

It is understood that in other embodiments, the buffer 32 may be other components with buffering function, including but not limited to springs, elastic rubber materials, dampers, etc.

Referring to fig. 3, in the present embodiment, the buffering mechanism 30 further includes a third connecting element 36, the third connecting element 36 is disposed on the first substrate 11, the third connecting element 36 is substantially plate-shaped, the buffering element 32 and the stopping element 34 are disposed on the same side of the third connecting element 36, and the buffering element 32 and the stopping element 34 are disposed opposite to the second connecting portion 2424.

As can be seen from fig. 3, a plurality of first grooves 112 are disposed on the outer side surface of the first substrate 11, as can be seen from fig. 2, a plurality of second grooves 122 corresponding to the plurality of first grooves 112 are disposed on one side of the second substrate 12 close to the first substrate 11, one end of the third connecting member 36 is fixedly disposed in the first grooves 112, and the other end of the third connecting member 36 is disposed in the second grooves 122. By providing the first groove 112 and the second groove 122, the size of the positioning device 100 can be reduced.

It is understood that in other embodiments, the first grooves 112 may be disposed only on two opposite sides of the first substrate 11 to reduce the difficulty of manufacturing the first substrate 11.

The above embodiments and drawings show various implementation manners and expansion possibilities of the positioning device 100 provided by the present application, and by adopting the above scheme, the positioning mechanism 20 of the positioning device 100 is buffered by using the plurality of buffer mechanisms 30, so as to reduce the impact force on the workpiece, solve the problems of workpiece deformation or damage caused by the previous workpiece positioning and inaccurate positioning caused by over-positioning or under-positioning, meet the positioning requirements of the mobile phone frame in the manufacturing process, and improve the positioning accuracy; the positioning device 100 provided by the present application can also meet the production positioning requirements of mobile phone frames with different sizes and different internal structures by replacing the positioning portion 246 or the second connecting member 244 and the positioning portion 246 according to different sizes of workpieces and differences of internal structures of workpieces without changing the positioning driving member 22 and the first connecting member 242, and reduce the design types of the positioning device 100, thereby reducing the development cost of the positioning device 100 for mobile phone frames with different models and styles, shortening the design period, quickly and effectively realizing switching of the positioning portion 246, and improving the production competitiveness; the method can be widely applied to the production and manufacturing processes of the mobile phone industry and the 3C electronic industry, and has strong universality.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (10)

1. A positioning device, comprising:

the base is used for placing a workpiece;

the positioning driving part drives the positioning part to move towards the inner wall surface close to or far away from the workpiece so as to internally support or release the workpiece; and

the buffer mechanisms are arranged on the base, each positioning mechanism corresponds to at least one buffer mechanism, each buffer mechanism comprises a buffer part and a stopping part, the buffer parts and the stopping parts are arranged opposite to the positioning parts, the buffer parts are used for buffering the movement of the positioning parts, and the stopping parts are used for stopping the positioning parts which move to preset positions.

2. The positioning device according to claim 1, wherein each of said positioning members comprises:

the first connecting piece is connected to the positioning driving piece;

the second connecting piece is connected to the first connecting piece; and

and the at least one positioning part is arranged on the second connecting piece, is opposite to the inner wall surface of the workpiece and is used for internally supporting or loosening the workpiece.

3. The positioning device of claim 2, wherein the first connector comprises:

the first connecting part is connected to the output end of the positioning driving part; and

and the second connecting part is connected between the first connecting part and the second connecting part and is used for driving the second connecting part and the at least one positioning part to move under the driving of the positioning driving part.

4. The positioning device of claim 3, wherein each of said positioning mechanisms further comprises:

the guide piece is arranged on the base; and

and the at least one guide block is in one-to-one correspondence with the at least one guide piece and is in sliding connection with the at least one guide piece, and the at least one guide block is connected to the second connecting part and used for guiding the first connecting part.

5. The positioning device as set forth in claim 3, wherein said buffer member and said stopper member are disposed opposite to said second connecting portion.

6. The positioning device of claim 1, wherein the base comprises:

the positioning driving piece and the buffer mechanism are fixedly arranged on the first substrate;

the second substrate is fixedly arranged on the first substrate; and

and the third substrate is fixedly arranged on one side of the second substrate, which is deviated from the first substrate, and is used for bearing the workpiece.

7. The positioning apparatus of claim 6, wherein each of said cushioning mechanisms further comprises:

the third connecting piece is arranged on the first substrate, and the buffer piece and the stopping piece are arranged on the same side of the third connecting piece.

8. The positioning device of claim 7, wherein the first substrate comprises:

the first grooves are formed in the outer side face of the first substrate;

the second substrate includes:

the plurality of second grooves are formed in one side, close to the first substrate, of the second substrate; one end of the third connecting piece is fixedly arranged in the first groove, and the other end of the third connecting piece is positioned in the second groove.

9. The positioning device of claim 6, wherein said base further comprises:

the at least two first limiting parts are fixedly arranged on the first substrate and used for guiding and positioning the second substrate when the second substrate is installed; and

the first fixing pieces are fixedly arranged on the first substrate and used for fixing the second substrate on the first substrate.

10. The positioning device of claim 6, wherein said base further comprises:

one end of each second limiting piece is arranged on the second substrate, the other end of each second limiting piece penetrates through the third substrate and protrudes out of the third substrate, the at least two second limiting pieces protrude out of an area surrounded by the third substrate to be used for placing the workpiece, and the at least two second limiting pieces are used for guiding and positioning the third substrate when the third substrate is installed; and

and the at least two second fixing pieces are fixedly arranged on one side of the second substrate close to the third substrate, and are used for fixing the third substrate on the second substrate.

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