Positioning device

Abstract

The utility model relates to a positioning device which comprises a seat body, a positioning seat, a first driving mechanism and a pressing plate, a first through hole is defined in the seat body, the bottom of the positioning seat is arranged on the seat body, the top of the positioning seat is constructed to be a supporting platform used for supporting a workpiece to be machined, and the first driving mechanism is arranged at the bottom of the seat body; an output shaft of the first driving mechanism sequentially penetrates through the first through hole, the second through hole and the machining hole and is detachably connected with the pressing plate, and the first driving mechanism is used for pushing the pressing plate to be close to or away from the supporting platform so that the pressing plate can be switched between the fixing position and the mounting position. According to the positioning device, the to-be-machined part is pressed on the supporting platform through the pressing plate, the first driving mechanism is arranged at the bottom of the seat body, then the to-be-machined part is pressed on the supporting platform in the mode that the output shaft of the first driving mechanism is connected with the pressing plate, the installation space above the seat body can be saved, and therefore the installation space of the whole positioning device is reduced; and the convenience of the positioning device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of molds, in particular to a positioning device. BACKGROUND

[0002] At present, in the field of manufacturing and processing, especially in the process of machining and numerical control machining, the positioning and fixing of workpieces are the key steps to ensure the machining precision and efficiency. Traditional positioning devices usually use mechanical clamps or pneumatic clamps to fix the workpieces. However, these traditional methods have some shortcomings in practical application.

[0003] In related technologies, although the pneumatic clamp can provide a larger clamping force, it usually needs to install a pneumatic cylinder above the seat body, and the workpiece is pressed tightly on the seat body by the driving pressure plate of the pneumatic cylinder. This design occupies a large amount of installation space, increases the volume and complexity of the equipment. Secondly, the pressure plate used to press the workpiece is generally fixedly connected with the output shaft of the pneumatic cylinder, which cannot adapt to different types of workpieces. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a positioning device to solve the above-mentioned problems.

[0005] In the first aspect, the present application provides a positioning device for fixing a workpiece, the workpiece is provided with a machining hole, the positioning device comprises a seat body, a positioning seat, a first driving mechanism and a pressure plate, the seat body is defined with a first through hole, the bottom of the positioning seat is arranged on the seat body, the positioning seat is defined with a second through hole corresponding to the first through hole, the top of the positioning seat is configured as a support platform for supporting the workpiece, the first driving mechanism is arranged at the bottom of the seat body, the output shaft of the first driving mechanism passes through the first through hole, the second through hole and the machining hole in sequence and is detachably connected with the pressure plate, the first driving mechanism is used to push the pressure plate to approach or move away from the support platform, so as to switch the pressure plate between the fixed position and the installation position, when the pressure plate is at the fixed position, the pressure plate presses the workpiece tightly on the support platform.

[0006] In some embodiments, the first driving mechanism comprises a pneumatic cylinder or a hydraulic cylinder.

[0007] In some embodiments, the pressure plate is provided with a clamping groove matched with the output shaft of the first driving mechanism, and the output shaft of the first driving mechanism is clamped in the clamping groove.

[0008] In some embodiments, a first limiting block is further included, the first limiting block is arranged at the end of the output shaft of the first driving mechanism away from the seat body, the clamping groove extends along a first direction, the size of the clamping groove in a second direction is smaller than the minimum size of the first limiting block in the second direction, and the size of the clamping groove in the second direction is greater than the diameter of the output shaft of the first driving mechanism, wherein the first direction and the second direction are perpendicular.

[0009] In some embodiments, a second limiting block is further included, and the second limiting block is arranged on the output shaft of the first driving mechanism, the output shaft of the first driving mechanism is defined with a sliding portion for the pressing plate to slide, the sliding portion is located between the first limiting block and the second limiting block, and the size of the clamping groove in the second direction is smaller than the minimum size of the first limiting block in the second direction.

[0010] In some embodiments, the bottom of the workpiece to be processed is defined with a recessed cavity in communication with the processing hole, and the support platform is arranged in the recessed cavity, and the four peripheral sides of the support platform abut against the inner wall of the recessed cavity.

[0011] In some embodiments, the side of the pressing plate facing the support platform is provided with a rubber pad.

[0012] In some embodiments, an arc-shaped chamfer is defined between the bottom surface of the pressing plate and the side surface of the pressing plate.

[0013] In some embodiments, a pressure sensor and a processor are further included, the pressure sensor is electrically connected with the processor, the pressure sensor is arranged on the support platform, and the pressure sensor is configured to sense the pressure when the workpiece to be processed is pressed against the support platform, and the processor drives the first driving mechanism to stop working when the pressure reaches a preset value.

[0014] In some embodiments, a rotary air cylinder is further included, and the rotary air cylinder is arranged in connection with the seat body, and the rotary air cylinder is used to drive the seat body to rotate.

[0015] Compared with the prior art, the above technical solutions provided by the embodiments of the present application have the following advantages:

[0016] The positioning device provided by the embodiments of the present application first passes the processing hole of the workpiece to be processed into the output shaft of the first driving mechanism to fix the workpiece to be processed on the support platform, and then drives the pressing plate to approach the support platform by the first driving mechanism to switch the pressing plate from the installation position to the fixed position, and then presses the workpiece to be processed on the support platform by the pressing plate driven by the first driving mechanism to realize the fixation of the workpiece to be processed. Compared with the way of setting the air cylinder above the seat body to drive the pressing plate to press the workpiece to be processed on the seat body in the related art, the present application sets the first driving mechanism at the bottom of the seat body, and then connects the output shaft of the first driving mechanism with the pressing plate to press the workpiece to be processed on the support platform, which can save the installation space above the seat body, thereby reducing the installation space of the entire positioning device and improving the convenience of the positioning device of the present application. In addition, the output shaft of the first driving mechanism is detachably connected with the pressing plate, so that the pressing plate can be replaced by being detached from the output shaft of the first driving mechanism, thereby enabling different sizes of the pressing plate to adapt to different types of workpieces to be processed, and further improving the adaptability of the positioning device of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings required to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0019] One or more embodiments are illustrated by way of example in the drawings that are not intended to be limiting of the application, and the same or similar reference numerals designate similar elements throughout the several views of the drawings, and wherein:

[0020] Figure 1 A structure schematic view of a workpiece to be processed according to an embodiment of the present application;

[0021] Figure 2 A structure schematic view of a positioning device according to an embodiment of the present application;

[0022] Figure 3 A connection relationship schematic view of a first driving mechanism and a pressing plate according to an embodiment of the present application;

[0023] Figure 4 A structure schematic view of a pressing plate according to an embodiment of the present application;

[0024] Figure 5 A structure schematic view of a positioning device according to an embodiment of the present application.

[0025] Legend of reference signs:

[0026] 10, positioning device;

[0027] 100, seat body;

[0028] 200, positioning seat; 210, second through hole; 220, support platform

[0029] 300, first driving mechanism; 310, output shaft; 320, sliding part;

[0030] 400, pressing plate; 410, clamping groove; 420, arc chamfer;

[0031] 500, first limiting block;

[0032] 600, second limiting block;

[0033] 20, workpiece to be processed; 21, processing hole; 22, recessed cavity. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0035] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of the particular examples in the following are described. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application can repeat reference numerals and / or letters in different 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 settings discussed.

[0036] For the purpose of description, spatial relative terms as shown in the drawings can be used to describe the relative position relationship or movement of one element or feature with respect to another element or feature, such as "internal", "external", "inboard", "outboard", "under", "below", "on", "above", "front", "back", and the like. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both the up and down positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0037] At present, in the field of manufacturing processing, especially in the process of machining and numerical control machining, the positioning and fixing of workpieces are the key steps to ensure the machining precision and efficiency. Traditional positioning devices usually use mechanical clamps or pneumatic clamps to fix the workpieces to be machined. However, these traditional methods have some shortcomings in practical application.

[0038] In the related art, the pneumatic clamp can provide a larger clamping force, but generally needs to install a pneumatic cylinder above the seat body, and drives the pressing plate to press the workpiece to be processed on the seat body, which occupies a large installation space and increases the volume and complexity of the equipment. Secondly, the pressing plate for pressing the workpiece to be processed is generally fixedly connected with the output shaft of the pneumatic cylinder, which cannot adapt to different types of workpieces to be processed.

[0039] Referring to Figures 1 to 5 , in order to solve the technical problems existing in the related art, the positioning device 10 provided by the embodiments of the present application is used for fixing the workpiece to be processed 20, and the workpiece to be processed 20 is provided with a machining hole 21.

[0040] It should be noted that, referring to Figure 1 , the workpiece to be processed 20 of the present application is mainly for the workpiece provided with the machining hole 21, and the shape of the workpiece to be processed 20 at other positions is not limited herein.

[0041] Referring to Figure 2 and Figure 3 , the positioning device 10 includes a seat body 100, a positioning seat 200, a first driving mechanism 300, and a pressing plate 400. The seat body 100 is defined with a first through hole, the bottom of the positioning seat 200 is arranged on the seat body 100, the positioning seat 200 is defined with a second through hole 210 corresponding to the first through hole, the top of the positioning seat 200 is configured as a support platform 220 for supporting the workpiece to be processed 20, the first driving mechanism 300 is arranged at the bottom of the seat body 100, the output shaft 310 of the first driving mechanism 300 passes through the first through hole, the second through hole 210 and the machining hole 21 in sequence and is detachably connected with the pressing plate 400, the first driving mechanism 300 is used for pushing the pressing plate 400 to approach or move away from the support platform 220, so as to switch the pressing plate 400 between the fixed position and the mounting position, and when the pressing plate 400 is at the fixed position, the pressing plate 400 presses the workpiece to be processed 20 on the support platform 220.

[0042] It can be understood that the diameters of the machining holes 21 of different workpieces to be processed 20 are different, and the present application can adjust the diameter of the output shaft 310 of the first driving mechanism 300, so that the diameter of the output shaft 310 of the first driving mechanism 300 is as close as possible to the diameter of the machining hole 21, so as to prevent a large radial deviation when the machining hole 21 of the workpiece to be processed 20 penetrates the output shaft 310 of the first driving mechanism 300.

[0043] According to the positioning device 10 of the present application, when the workpiece 20 needs to be processed, first, the processing hole 21 of the workpiece 20 is inserted into the output shaft 310 of the first driving mechanism 300 to fix the workpiece 20 on the support platform 220, and then the first driving mechanism 300 drives the pressing plate 400 to approach the support platform 220, so that the pressing plate 400 is switched from the mounting position to the fixed position, and then the pressing plate 400 driven by the first driving mechanism 300 presses the workpiece 20 tightly on the support platform 220, so as to realize the fixation of the workpiece 20. Compared with the related art, the output shaft 310 of the first driving mechanism 300 is arranged at the bottom of the seat body 100, and then the workpiece 20 is pressed tightly on the support platform 220 by connecting the output shaft 310 of the first driving mechanism 300 with the pressing plate 400, which can save the installation space above the seat body 100, thereby reducing the installation space of the whole positioning device 10 and improving the convenience of the positioning device 10 of the present application. In addition, the output shaft 310 of the first driving mechanism 300 is detachably connected with the pressing plate 400, so that the pressing plate 400 can be replaced by being detached from the output shaft 310 of the first driving mechanism 300, thereby enabling the replacement of the pressing plate 400 of different sizes to adapt to different types of workpieces 20, and further improving the adaptability of the positioning device 10 of the present application.

[0044] In some examples, the first driving mechanism 300 includes a pneumatic cylinder or a hydraulic cylinder.

[0045] In some examples, referring to Figures 2 to 4 The pressing plate 400 is provided with a clamping groove 410 matched with the output shaft 310 of the first driving mechanism 300, and the output shaft 310 of the first driving mechanism 300 is clamped in the clamping groove 410. On the one hand, the clamping groove 410 makes the installation and disassembly of the pressing plate 400 more simple and fast, and the operator only needs to clamp the output shaft 310 of the first driving mechanism 300 in the clamping groove 410 of the pressing plate 400 to complete the installation or disassembly, which reduces the time and difficulty of installation and disassembly, and improves the operation convenience and maintenance efficiency. On the other hand, through the design of the clamping groove 410, the pressing plate 400 can be conveniently and detachably connected with the output shaft 310 of the first driving mechanism 300, so that when it is necessary to replace the pressing plate 400 of different sizes or shapes, the current pressing plate 400 can be simply detached from the output shaft 310, and the new pressing plate 400 can be clamped in the clamping groove 410 of the output shaft 310. This flexible replacement mode enables the positioning device 10 to adapt to different types and sizes of workpieces 20, and significantly improves the adaptability and versatility of the equipment.

[0046] Exemplarily, the clamping groove 410 can adopt a straight groove, a curved groove, a U-shaped groove, or the like. In a preferred embodiment, the pressing plate 400 is in a cylindrical shape, and the clamping groove 410 is a straight groove and passes through the center of the cylindrical pressing plate 400, so as to improve the convenience of connecting the pressing plate 400 and the output shaft 310 of the first driving mechanism 300. It can be understood that those skilled in the art can select clamping grooves 410 of different shapes according to requirements, which are not limited to the clamping groove 410 of the above embodiment.

[0047] In some examples, referring to Figures 2 to 5 The application also comprises a first limiting block 500, which is arranged at an end of the output shaft 310 of the first driving mechanism 300 away from the seat body 100. The clamping groove 410 extends in a first direction, and the size of the clamping groove 410 in a second direction is smaller than the minimum size of the first limiting block 500 in the second direction, and the size of the clamping groove 410 in the second direction is greater than the diameter of the output shaft 310 of the first driving mechanism 300, wherein the first direction and the second direction are perpendicular to each other. In this way, when the first driving mechanism 300 drives the pressing plate 400 to press the workpiece 20 to be processed, the first limiting block 500 can abut against the side of the pressing plate 400 away from the workpiece 20 to be processed, and the pressure applied to the pressing plate 400 by the first limiting block 500 can prevent the output shaft 310 of the first driving mechanism 300 and the pressing plate 400 from being separated even under vibration or external force, thereby improving the stability of the pressing plate 400 in a fixed position, effectively preventing the output shaft 310 and the pressing plate 400 from loosening or falling off during work, and improving the connection stability and reliability of the entire positioning device 10.

[0048] According to the embodiments of the application, the design of the limiting block ensures that the pressing plate 400 remains stable during work and does not loosen to affect the fixing effect of the workpiece 20 to be processed, which is beneficial to improve the precision of the workpiece 20 to be processed during processing, ensures that the position of the workpiece 20 to be processed on the support platform 220 does not deviate, and thus guarantees the processing quality.

[0049] In some embodiments, referring to Figures 2 to 5The second limiting block 600 is arranged on the output shaft 310 of the first driving mechanism 300, and a sliding portion 320 for sliding of the pressing plate 400 is defined on the output shaft 310 of the first driving mechanism 300. The sliding portion 320 is located between the first limiting block 500 and the second limiting block 600. The size of the clamping groove 410 in the second direction is smaller than the minimum size of the first limiting block 500 in the second direction. In this way, when the clamping groove 410 of the pressing plate 400 is clamped into the sliding portion 320, the pressing plate 400 will abut against the second limiting block 600 after falling under the action of gravity, and will not directly impact the workpiece 20, thereby protecting the workpiece 20. In addition, the arrangement of the second limiting block 600 not only protects the workpiece 20, but also improves the overall safety of the equipment by preventing the pressing plate 400 from accidentally falling and impacting the workpiece 20, thereby reducing equipment failure and safety hazards.

[0050] In some embodiments, the bottom of the workpiece 20 is defined with a recessed cavity 22 communicating with the machining hole 21, and the support platform 220 is arranged in the recessed cavity 22. The four side surfaces of the support platform 220 abut against the inner walls of the recessed cavity 22.

[0051] For example, referring to Figure 5 , the support platform 220 has four side surfaces, and the recessed cavity 22 of the workpiece 20 has four inner wall surfaces. When the workpiece 20 is clamped on the support platform 220, the four side surfaces of the support platform 220 can be fitted to the four inner wall surfaces of the recessed cavity 22 of the workpiece 20, so that the workpiece 20 and the support platform 220 cannot rotate relative to each other, thereby improving the positioning accuracy of the support platform 220 to the workpiece 20. In addition, when the side surface of the workpiece 20 needs to be machined, the four side surfaces of the support platform 220 provide support to the side surface of the workpiece 20 to avoid stress concentration of the workpiece 20.

[0052] In some embodiments, the side of the pressing plate 400 facing the support platform 220 is provided with a rubber pad, which protects the workpiece 20.

[0053] In some embodiments, referring to Figure 4 , an arc chamfer 420 is defined between the bottom surface of the pressing plate 400 and the side surface of the pressing plate 400. The arc chamfer 420 can effectively reduce friction and collision between the bottom surface and the side surface of the pressing plate 400 and the workpiece 20 during operation. Compared with sharp right-angled edges, the arc chamfer 420 can more smoothly contact the workpiece 20, thereby reducing wear and damage to the surface of the workpiece 20, and protecting the quality and integrity of the workpiece 20.

[0054] In some embodiments, the application further comprises a pressure sensor and a processor, the pressure sensor is electrically connected with the processor, the pressure sensor is arranged on the support platform 220, and the pressure sensor is configured to sense the pressure when the workpiece 20 is pressed against the support platform 220. In this way, when the pressure reaches a preset value, the processor drives the first driving mechanism 300 to stop working. The processor can accurately control the first driving mechanism 300 to stop working according to the pressure sensed by the pressure sensor, so as to ensure that the fixing force of the workpiece 20 is moderate, and avoid being too tight or too loose. Secondly, the preset pressure value can be adjusted according to the material and shape of the workpiece 20, so as to avoid damage to the workpiece 20 caused by excessive pressure, and it is especially suitable for fragile or precise workpieces.

[0055] It should be noted that the pressure sensor can be a capacitive pressure sensor, a strain gauge pressure sensor, a piezoelectric pressure sensor, a piezoresistive pressure sensor, or an inductive pressure sensor, which is not limited here.

[0056] In some embodiments, the application further comprises a rotary air cylinder, which is arranged in connection with the seat body 100, and is used to drive the seat body 100 to rotate. By arranging the rotary air cylinder to drive the seat body 100 to rotate, the workpiece 20 can be positioned and adjusted at multiple angles during the machining process. In this way, the flexibility of machining is improved, and the machining requirements of the workpiece 20 at different angles and directions can be met, so as to adapt to more complex and diversified machining tasks.

[0057] In summary, when the workpiece 20 needs to be processed, first, the processing hole 21 of the workpiece 20 is inserted into the output shaft 310 of the first driving mechanism 300, so that the workpiece 20 is fixed on the support platform 220, then the pressing plate 400 is driven by the first driving mechanism 300 to approach the support platform 220, so that the pressing plate 400 is switched from the mounting position to the fixed position, and then the workpiece 20 is pressed on the support platform 220 by the pressing plate 400 driven by the first driving mechanism 300, so as to realize the fixation of the workpiece 20. Compared with the related art, the output shaft 310 of the first driving mechanism 300 is arranged at the bottom of the seat body 100, and then the workpiece 20 is pressed on the support platform 220 by connecting the output shaft 310 of the first driving mechanism 300 with the pressing plate 400, which can save the installation space above the seat body 100, thereby reducing the installation space of the entire positioning device 10, improving the convenience of the positioning device 10 of the present application, and secondly, the output shaft 310 of the first driving mechanism 300 and the pressing plate 400 are detachably connected, so that the pressing plate 400 can be replaced by being detached from the output shaft 310 of the first driving mechanism 300, so that different sizes of the pressing plate 400 can be adapted to different types of workpieces 20, thereby improving the adaptability of the positioning device 10 of the present application.

[0058] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0059] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0060] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0061] In the present application, unless specifically defined otherwise, the terms "mount", "connected", "connecting", "fixed", "linking", and the like should be construed broadly and can include various forms of connections, such as connection and detachable connection, or integral connection; mechanical connection, or electrical connection; direct connection, or indirect connection via an intermediate medium; internal communication between two elements, or interaction between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

[0062] In the present application, unless specifically defined otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Under", "below" and "under" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0063] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0064] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, any modifications and variations of the present application within the scope of the claims of the present application and their equivalents are intended to be included in the present application.

[0065] The above is a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A positioning device for fixing a workpiece to be processed, said workpiece to be processed being provided with a processing hole, characterized in that, The positioning device comprises a seat body, a positioning seat, a first driving mechanism and a pressing plate. The seat body is provided with a first through hole. The bottom of the positioning seat is arranged on the seat body. The positioning seat is provided with a second through hole corresponding to the first through hole. The top of the positioning seat is configured as a support platform for supporting the workpiece. The first driving mechanism is arranged at the bottom of the seat body. The output shaft of the first driving mechanism passes through the first through hole, the second through hole and the machining hole in sequence and is detachably connected with the pressing plate. The first driving mechanism is used to push the pressing plate to move close to or away from the support platform, so as to switch the pressing plate between the fixed position and the mounting position. When the pressing plate is in the fixed position, the pressing plate presses the workpiece tightly on the support platform.

2. The positioning device of claim 1, wherein, The first driving mechanism comprises a pneumatic cylinder or a hydraulic cylinder.

3. The positioning device of claim 1, wherein, The pressing plate is provided with a clamping groove matched with the output shaft of the first driving mechanism. The output shaft of the first driving mechanism is clamped in the clamping groove.

4. The positioning device of claim 3, wherein, A first limiting block is further arranged on the end of the output shaft of the first driving mechanism away from the seat body. The clamping groove extends in a first direction. The size of the clamping groove in a second direction is smaller than the minimum size of the first limiting block in the second direction. The size of the clamping groove in the second direction is larger than the diameter of the output shaft of the first driving mechanism. The first direction and the second direction are perpendicular to each other.

5. The positioning device of claim 4, wherein, A second limiting block is further arranged on the output shaft of the first driving mechanism. A sliding part is defined on the output shaft of the first driving mechanism for the sliding of the pressing plate. The sliding part is located between the first limiting block and the second limiting block. The size of the clamping groove in the second direction is smaller than the minimum size of the first limiting block in the second direction.

6. The positioning device of claim 1, wherein, The bottom of the workpiece is provided with a recessed cavity in communication with the machining hole. The support platform is arranged in the recessed cavity. The peripheral side surface of the support platform abuts against the inner wall of the recessed cavity.

7. The positioning device of claim 1, wherein, The side of the pressing plate facing the support platform is provided with a rubber pad.

8. The positioning device of claim 1, wherein, An arc-shaped chamfer is defined between the bottom surface of the pressing plate and the side surface of the pressing plate.

9. The positioning device of claim 1, wherein, A pressure sensor and a processor are further included. The pressure sensor is electrically connected with the processor. The pressure sensor is arranged on the support platform. The pressure sensor is configured to sense the pressure when the workpiece is pressed against the support platform. When the pressure reaches a preset value, the processor drives the first driving mechanism to stop working.

10. The positioning device of claim 1, wherein, A rotary air cylinder is further included. The rotary air cylinder is arranged on the seat body. The rotary air cylinder is used to drive the rotation of the seat body.

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