Positioning device

Abstract

The utility model relates to a positioning device. The positioning device comprises a seat body, a first driving mechanism, a pressing plate and at least two positioning plates, the bottom of the positioning plate is connected with the seat body, the top surface of the positioning plate is provided with a limiting convex strip which extends in the first direction and is matched with the clamping groove, and the limiting convex strip is provided with two limiting blocks which are arranged at intervals in the first direction; the first driving mechanism is arranged between the at least two positioning plates; the first driving mechanism is connected with the pressing plate; the first driving mechanism is used for driving the pressing plate to be switched between the fixing position and the mounting position; when the pressing plate is located at the fixed position, the pressing plate abuts against the top face of the to-be-machined part, the two limiting blocks abut against the two sides, in the first direction, of the to-be-machined part correspondingly, and the limiting protruding strip extending in the first direction and the two limiting blocks are arranged, so that the to-be-machined part can be accurately located at the preset position; the workpiece to be machined can be effectively fixed, displacement of the workpiece to be machined in the machining process is prevented, and therefore the machining precision 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, many workpieces need to be clamped and positioned by positioning devices before processing, so as to facilitate the mechanical processing of the workpieces by processing tools.

[0003] In the related art, when positioning a workpiece provided with a clamping groove at the bottom, the positioning device needs to clamp both sides of the workpiece. However, due to the clamping groove at the bottom of the workpiece, the positioning device is prone to causing deformation of the workpiece when clamping the workpiece. CONTENT OF THE UTILITY MODEL

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

[0005] In a first aspect, the present application provides a positioning device for fixing a workpiece, the bottom surface of the workpiece being provided with a clamping groove extending in a first direction, the positioning device comprising: a seat body, a first driving mechanism, a pressing plate, and at least two positioning plates; the bottom of the positioning plate is connected with the seat body, the top surface of the positioning plate is provided with a limiting convex strip extending in the first direction and matched with the clamping groove, and two limiting blocks are arranged on the limiting convex strip and spaced apart in the first direction; the first driving mechanism is arranged between the at least two positioning plates; the first driving mechanism is connected with the pressing plate; the first driving mechanism is used to drive the pressing plate to move towards or away from the top of the positioning plate in a second direction, so as to switch the pressing plate between a fixed position and an installation position; when the pressing plate is at the fixed position, the pressing plate abuts against the top surface of the workpiece, and the two limiting blocks abut against the two sides of the workpiece in the first direction, respectively; wherein the first direction and the second direction intersect.

[0006] In some embodiments, at least two rubber pads are further included, the number of the at least two rubber pads being matched with the number of the at least two positioning plates, and the pressing plate is defined with installation grooves on the side facing the seat body, and the rubber pads are arranged in the corresponding installation grooves.

[0007] In some embodiments, the distance between each rubber pad and the first driving mechanism in the at least two rubber pads is equal.

[0008] In some embodiments, the rubber pad protrudes from the side of the pressing plate facing the seat body.

[0009] 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 any one of the at least two positioning plates, and the pressure sensor is configured to sense the pressure when the pressing plate approaches the positioning plate, and the processor drives the first driving mechanism to stop working when the pressure reaches a preset value.

[0010] In some embodiments, at least two supporting blocks are arranged on the top surface of the positioning plate, the supporting blocks abut against the bottom surface of the workpiece to be processed, and a relief groove for stress release of the workpiece to be processed is defined between the top surface of the positioning plate and the bottom surface of the workpiece to be processed.

[0011] In some embodiments, one of the at least two supporting blocks is arranged on one side of the limiting protrusion in the third direction, and the other supporting block is arranged on the other side of the limiting protrusion in the third direction, the third direction being perpendicular to the first direction.

[0012] In some embodiments, the first driving mechanism comprises a pneumatic cylinder or a hydraulic cylinder.

[0013] In some embodiments, the limiting protrusion is provided with an adsorption device for adsorbing the workpiece to be processed.

[0014] In some embodiments, the adsorption device comprises at least one of a magnet and an air suction device.

[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, when the workpiece to be processed needs to be processed, first drives the pressing plate to move away from the positioning plate in the second direction by the first driving mechanism, when the pressing plate is in the installation position, there is enough space between the pressing plate and the positioning plate to place the workpiece to be processed, at this time, the workpiece to be processed is placed on the top surface of the positioning plate and the limiting protrusion is clamped into the clamping groove of the workpiece to be processed, and the workpiece to be processed is between the two limiting blocks, then the pressing plate is driven to move towards the positioning plate in the second direction by the first driving mechanism, so that the positioning plate switches to the fixed position, at this time, the pressing plate presses the workpiece to be processed on the limiting protrusion, so as to realize the positioning of the workpiece to be processed. The limiting protrusion and the two limiting blocks extending in the first direction are arranged, so that the workpiece to be processed can be accurately positioned at the predetermined position, the workpiece to be processed can be effectively fixed, and displacement of the workpiece to be processed during processing is prevented, thereby improving the processing precision, and the limiting protrusion is clamped in the clamping groove of the workpiece to be processed, the limiting protrusion plays a supporting role on the side wall of the clamping groove, so as to prevent deformation of the workpiece to be processed during positioning. Secondly, the two sides of the two limiting blocks in the first direction provide additional support and limitation, ensuring the stability and firmness of the workpiece to be processed. Furthermore, when the pressing plate is in the installation position, the workpiece to be processed can be conveniently placed or removed; when the pressing plate is in the fixed position, the workpiece to be processed is firmly fixed, so that the workpiece to be processed installation and disassembly process is simplified, and the operation efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings described below only illustrate the technical solutions of the embodiments of the present application, and for those skilled in the art, based on the drawings, other drawings can be obtained without creative effort.

[0019] One or more embodiments are illustrated by way of example with reference to the drawings, which are schematic and not drawn to scale, wherein the same or similar elements are denoted by the same reference numerals, and wherein the specific embodiments are illustrated by way of example in the drawings and are not intended to limit the present application, and the drawings are not drawn to scale.

[0020] Figure 1 A structural schematic view of a workpiece to be processed in the embodiments of the present application;

[0021] Figure 2 A structural schematic view of a positioning device in the embodiments of the present application;

[0022] Figure 3 A side view of the positioning device in the embodiments of the present application;

[0023] Figure 4 An enlarged schematic view of A in FIG. 4; Figure 3

[0024] Figure 5 A structural schematic view of a positioning plate in the embodiments of the present application.

[0025] Explanation of reference numerals:

[0026] 1. Positioning device

[0027] 10. Seat body

[0028] 20. First driving mechanism

[0029] 30. Pressing plate; 31. Mounting groove

[0030] 40. Positioning plate

[0031] 50. Limiting convex strip

[0032] 60. Limiting block

[0033] 70. Rubber pad

[0034] 80. Supporting block; 81. Avoidance groove

[0035] 2. Workpiece to be processed; 21. Clamping groove

[0036] X, first direction; Y, second direction; Z, third direction DETAILED DESCRIPTION​

[0037] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings 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 effort belong to the scope of protection of the present application.

[0038] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the description of a particular example will not necessarily be repeated in the description of each example. Furthermore, the present application can use reference numbers 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 configurations discussed.

[0039] For the purpose of simplicity, spatial relative terms can be used in the description to describe the relative position relationship or movement of one element or feature with respect to another element or feature as shown in the drawings, such as "inner", "outer", "inward", "outward", "under", "below", "above", "top", "bottom", etc. 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 reversed, or the orientation of the device is changed, the indication of the direction will also change accordingly, for example, an element described as "under" or "below" another element will be subsequently oriented as "above" or "above" the other element. Therefore, the example term "below" can include both upward and downward positions. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the description are interpreted accordingly.

[0040] At present, many workpieces to be machined need to be clamped and positioned by a positioning device before machining, so as to facilitate the mechanical machining of the workpiece to be machined by a machining tool.

[0041] In the related art, when a workpiece to be machined provided with a clamping groove at the bottom needs to be positioned, the positioning device needs to clamp both sides of the workpiece to be machined. However, due to the clamping groove at the bottom of the workpiece to be machined, the positioning device is prone to cause deformation of the workpiece to be machined when clamping the workpiece to be machined.

[0042] Referring to Figure 1 and Figure 2In order to solve the technical problems in the related art, the positioning device 1 provided by the embodiments of the present application is used for fixing the workpiece 2 to be processed, and the bottom surface of the workpiece 2 to be processed is provided with a clamping groove 21 extending along a first direction X.

[0043] It should be noted that the workpiece 2 to be processed of the present application is mainly aimed at the workpiece provided with the clamping groove 21 on the bottom surface, and the shape of the workpiece 2 to be processed at other positions is not limited herein.

[0044] Referring to Figures 1 to 5 The positioning device 1 comprises a seat body 10, a first driving mechanism 20, a pressing plate 30 and at least two positioning plates 40. The bottom of the positioning plate 40 is connected with the seat body 10, and the top surface of the positioning plate 40 is provided with a limiting convex strip 50 extending along the first direction X and matched with the clamping groove 21, and two limiting blocks 60 are arranged on the limiting convex strip 50 and spaced apart along the first direction X. The first driving mechanism 20 is arranged between the at least two positioning plates 40. The first driving mechanism 20 is connected with the pressing plate 30. The first driving mechanism 20 is used for driving the pressing plate 30 to move towards or away from the top of the positioning plate 40 along a second direction Y, so as to switch the pressing plate 30 between a fixed position and a mounting position. When the pressing plate 30 is at the fixed position, the pressing plate 30 abuts against the top surface of the workpiece 2 to be processed, and the two limiting blocks 60 respectively abut against the two sides of the workpiece 2 to be processed in the first direction X. The first direction X and the second direction Y intersect.

[0045] It can be understood that the length, width or depth of the clamping groove 21 of different workpieces 2 to be processed is different, and the present application can adapt to different workpieces 2 to be processed by adjusting the length, width or depth of the limiting convex strip 50.

[0046] According to the positioning device 1 provided by the application, when the workpiece 2 needs to be machined, the pressing plate 30 is first driven by the first driving mechanism 20 to move away from the positioning plate 40 along the second direction Y, and when the pressing plate 30 is in the installation position, there is enough space between the pressing plate 30 and the positioning plate 40 to place the workpiece 2, at this time, the workpiece 2 is placed on the top surface of the positioning plate 40 and the limiting convex strip 50 is clamped into the clamping groove 21 of the workpiece 2, and the workpiece 2 is between the two limiting blocks 60, then the pressing plate 30 is driven by the first driving mechanism 20 to move towards the positioning plate 40 along the second direction Y, so that the positioning plate 40 is switched to the fixed position, at this time, the pressing plate 30 presses the workpiece 2 on the limiting convex strip 50, so as to realize the positioning of the workpiece 2. According to the application, the limiting convex strip 50 and the two limiting blocks 60 extending along the first direction X are arranged, so that the workpiece 2 can be accurately positioned at the predetermined position, the workpiece 2 can be effectively fixed, and displacement of the workpiece 2 in the machining process is prevented, so that the machining precision is improved, and the limiting convex strip 50 is clamped in the clamping groove 21 of the workpiece 2, the limiting convex strip 50 plays a supporting role on the side wall of the clamping groove 21, so as to prevent the workpiece 2 from deforming in the positioning process. Secondly, the two sides of the two limiting blocks 60 in the first direction X provide additional support and limitation, so as to ensure the stability and firmness of the workpiece 2. Furthermore, when the pressing plate 30 is in the installation position, the workpiece 2 can be conveniently placed or removed, and when the pressing plate 30 is in the fixed position, the workpiece 2 is firmly fixed, so that the workpiece 2 installation and dismounting process is simplified, and the operation efficiency is improved.

[0047] In some embodiments, referring to Figure 1 , the positioning plate 40 and the seat body 10 are detachably connected, so that when the workpiece 2 of different sizes needs to be replaced, only the positioning plate 40 on the seat body 10 needs to be replaced, and the whole positioning device 1 does not need to be replaced, so that the effect of reducing the cost, improving the production efficiency and the machining precision is achieved, so as to adapt to various machining requirements, and the versatility and the modular degree of the positioning device 1 are also enhanced.

[0048] In the embodiments of the application, in order to improve the connection precision between the positioning plate 40 and the seat body 10, the cross-shaped protrusion is arranged on the positioning plate 40, the cross-shaped groove is arranged on the seat body 10, and the cross-shaped protrusion of the positioning plate 40 is clamped in the cross-shaped groove of the seat body 10, so as to improve the connection precision between the positioning plate 40 and the seat body 10.

[0049] In some embodiments, referring to Figures 2 to 4The application also comprises at least two rubber pads 70, the number of which is matched with that of the at least two positioning plates 40, and mounting grooves 31 are defined on the side of the pressing plate 30 facing the seat body 10, and the rubber pads 70 are arranged in the corresponding mounting grooves 31. In this way, on the one hand, the vibration and impact force received by the workpiece during processing can be effectively absorbed by the rubber pads 70, so that the workpiece 2 can obtain better buffering and shock absorption effect when being fixed, and the damage to the workpiece 2 during processing can be reduced, and the surface quality of the workpiece 2 can be protected. On the other hand, the elasticity and friction characteristics of the rubber pads 70 not only limit the sliding and displacement of the workpiece 2, but also adapt to workpieces 2 of different shapes and sizes, and effectively reduce the noise and vibration transmission of the workpiece 2 during processing.

[0050] In some embodiments, the distance between each rubber pad 70 and the first driving mechanism 20 is equal, and in this way, the stress between the multiple workpieces 2 can be more uniform, so as to avoid the situation that the workpieces 2 are inclined or deformed due to uneven stress, thereby improving the stability and processing precision of the workpiece.

[0051] In some embodiments, referring to Figure 4 The rubber pads 70 protrude from the side of the pressing plate 30 facing the seat body 10, and in this way, the workpiece 2 can first contact the rubber pads 70 when being positioned, so as to avoid the situation that the workpiece 2 directly contacts the hard pressing plate 30 and causes scratches, indentations or other surface damage.

[0052] In some embodiments, the rubber pads 70 are detachably connected with the pressing plate 30, and in this way, the rubber pads 70 can be removed and replaced when damaged.

[0053] In some embodiments, the application also comprises a pressure sensor and a processor, the pressure sensor is electrically connected with the processor, the pressure sensor is arranged on any one of the at least two positioning plates 40, and the pressure sensor is configured to sense the pressure when the pressing plate 30 approaches the positioning plate 40, and the processor drives the first driving mechanism 20 to stop working when the pressure reaches a preset value. The pressure sensor can sense the pressure change when the pressing plate 30 approaches the positioning plate 40 in real time, and transmit the data to the processor. When the pressure reaches the preset value, the processor will immediately instruct the first driving mechanism 20 to stop working. In this way, the force applied by the pressing plate 30 on the workpiece 2 can be accurately controlled, and excessive or insufficient fixing force can be avoided, thereby playing a role in protecting the workpiece 2 and the pressing plate 30.

[0054] In some embodiments, referring to Figure 5The top surface of the positioning plate 40 is provided with at least two supporting blocks 80, the supporting blocks 80 abut against the bottom surface of the workpiece 2, and the top surface of the positioning plate and the bottom surface of the workpiece 2 are limited to define an avoiding groove 81 for stress release of the workpiece 2, the avoiding groove 81 provides space for stress release, prevents the stress of the workpiece 2 from being concentrated in a certain position, thereby reducing the risk of deformation and damage of the workpiece 2, so that the stress generated in the fixing process and the machining process of the workpiece 2 can be effectively released, thereby avoiding the situation that the workpiece 2 is warped or deformed due to stress concentration, and the machining precision and the finished product quality are improved.

[0055] In some embodiments, referring to Figure 1 and Figure 5 One of the at least two supporting blocks 80 is arranged on one side of the limiting convex strip 50 in the third direction Z, and the other supporting block 80 is arranged on the other side of the limiting convex strip 50 in the third direction Z, the third direction Z is perpendicular to the first direction X, so that the workpiece 2 can be supported by the supporting blocks 80 on both sides of the limiting convex strip 50, thereby improving the fixing stability of the positioning device 1 to the workpiece 2.

[0056] In some embodiments, the first driving mechanism 20 includes a pneumatic cylinder or a hydraulic cylinder.

[0057] In some embodiments, the limiting convex strip 50 is provided with an adsorption device, the adsorption device is used to adsorb the workpiece 2, and the fixing stability of the positioning device 1 to the workpiece 2 is further improved.

[0058] In some embodiments, the adsorption device includes at least one of a magnet and an air suction device. That is, the adsorption device in the embodiments of the application includes but is not limited to a magnet and an air suction device.

[0059] When the adsorption device is a magnet, the workpiece 2 is fixed by magnetic attraction between the adsorption device and the workpiece 2.

[0060] When the adsorption device is an air suction device, the air suction device can be a vacuum air suction device, that is, the air pressure between the workpiece 2 and the limiting convex strip 50 is lower than the ambient pressure by using the air suction device.

[0061] The above embodiments have at least the following beneficial effects:

[0062] According to the positioning device 1 provided by the application, when the workpiece 2 needs to be machined, the pressing plate 30 is first driven by the first driving mechanism 20 to move away from the positioning plate 40 along the second direction Y, and when the pressing plate 30 is in the installation position, there is enough space between the pressing plate 30 and the positioning plate 40 to place the workpiece 2, at this time, the workpiece 2 is placed on the top surface of the positioning plate 40 and the limiting convex strip 50 is clamped into the clamping groove 21 of the workpiece 2, and the workpiece 2 is between the two limiting blocks 60, then the pressing plate 30 is driven by the first driving mechanism 20 to move towards the positioning plate 40 along the second direction Y, so that the positioning plate 40 is switched to the fixed position, at this time, the pressing plate 30 presses the workpiece 2 on the limiting convex strip 50, so as to realize the positioning of the workpiece 2. The limiting convex strip 50 and the two limiting blocks 60 extending along the first direction X are arranged, so that the workpiece 2 can be accurately positioned at the predetermined position, the workpiece 2 can be effectively fixed, and displacement of the workpiece 2 during machining is prevented, so as to improve the machining precision, and the limiting convex strip 50 is clamped in the clamping groove 21 of the workpiece 2, the limiting convex strip 50 plays a supporting role on the side wall of the clamping groove 21, so as to prevent the workpiece 2 from deforming during positioning. Secondly, the two sides of the two limiting blocks 60 in the first direction X provide additional support and limitation, so as to ensure the stability and firmness of the workpiece 2. Furthermore, when the pressing plate 30 is in the installation position, the workpiece 2 can be conveniently placed or removed; when the pressing plate 30 is in the fixed position, the workpiece 2 is firmly fixed, so that the workpiece 2 installation and disassembly process is simplified, and the operation efficiency is improved.

[0063] 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.

[0064] 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 a limitation on the present application.

[0065] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the technical features indicated. Thus, the features defined with "first", "second", etc. can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0066] In the present application, unless otherwise explicitly and specifically defined, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be connected, or detachable, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless otherwise explicitly and specifically defined, the first feature "on" or "under" the second feature can include the first and second features directly contacting, or the first and second features not directly contacting but contacting through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0068] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction 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.

[0069] 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, these modifications and variations of the present application are intended to be included within the scope of the claims of the present application and their equivalents.

[0070] The above is merely specific embodiments of the present application, and the protection scope of the present application is not limited thereto, and any modification or replacement within the technical scope disclosed by the present application can be easily thought by those skilled in the art, and these modifications or replacements shall be encompassed in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A positioning device for fixing a workpiece to be processed, the bottom surface of the workpiece to be processed being provided with a clamping groove extending in a first direction, characterized in that, The positioning device comprises a seat body, a first driving mechanism, a pressing plate, and at least two positioning plates. The bottom of the positioning plate is connected to the seat body. The top surface of the positioning plate is provided with a limiting protrusion extending in a first direction and matched with the clamping groove. Two limiting blocks are arranged on the limiting protrusion in the first direction. The first driving mechanism is arranged between the at least two positioning plates. The first driving mechanism is connected to the pressing plate. The first driving mechanism is used to drive the pressing plate to move towards or away from the top of the positioning plate in a second direction, so as to switch the pressing plate between a fixed position and a mounting position. When the pressing plate is in the fixed position, the pressing plate abuts against the top surface of the workpiece, and the two limiting blocks abut against the two sides of the workpiece in the first direction, respectively. The first direction and the second direction intersect.

2. The positioning device of claim 1, wherein, At least two rubber pads are further included. The number of the rubber pads is matched with the number of the at least two positioning plates. The rubber pad is arranged in a corresponding mounting groove on the side of the pressing plate facing the seat body.

3. The positioning device of claim 2, wherein, The distance between each rubber pad in the at least two rubber pads and the first driving mechanism is equal.

4. The positioning device of claim 2, wherein, The rubber pad protrudes from the side of the pressing plate facing the seat body.

5. The positioning device of claim 1, wherein, A pressure sensor and a processor are further included. The pressure sensor is electrically connected to the processor. The pressure sensor is arranged on any one of the at least two positioning plates. The pressure sensor is configured to sense the pressure when the pressing plate approaches the positioning plate. When the pressure reaches a preset value, the processor drives the first driving mechanism to stop working.

6. The positioning device of claim 1, wherein, At least two supporting blocks are arranged on the top surface of the positioning plate. The supporting blocks abut against the bottom surface of the workpiece. An avoiding groove for releasing the stress of the workpiece is defined between the top surface of the positioning plate and the bottom surface of the workpiece.

7. The positioning device of claim 2, wherein, One of the at least two supporting blocks is arranged on one side of the limiting protrusion in a third direction. The other supporting block is arranged on the other side of the limiting protrusion in the third direction. The third direction is perpendicular to the first direction.

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

9. The positioning device of claim 1, wherein, An adsorption device is arranged on the limiting protrusion. The adsorption device is used to adsorb the workpiece.

10. The positioning device of claim 9, wherein, The adsorption device at least comprises any one of a magnet and an air suction device.

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