Rapid clamping device

Abstract

The utility model relates to the technical field of machining, and discloses a rapid clamping device which comprises a base, a pressing mechanism, a first limiting block and a first positioning mechanism. The base is used for bearing a workpiece; the pressing mechanism comprises a pressing block and a first driving piece, and the first driving piece is connected with the pressing block and can drive the pressing block to descend or ascend so as to press the workpiece or release the workpiece; the first limiting block is fixed to the top of the base and located on one side of the workpiece. The first positioning mechanism comprises a first positioning block and a second driving piece, the first positioning block is located above the end, away from the first limiting block in the first direction, of the base, and the second driving piece is installed on the base. The second driving piece is connected with the first positioning block and can drive the first positioning block to get close to the workpiece in the first direction and abut against the workpiece; the positioning device has the advantages of simplicity in operation and time-saving and labor-saving positioning.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing technical field, especially a kind of quick clamping device. BACKGROUND

[0002] Quick clamping device is a kind of common mechanical positioning and locking device, and has extremely extensive application in production and processing and test testing etc.Field;But traditional quick clamping device, most exist operation complex, positioning time-consuming and labor-saving defects. INVENTION CONTENTS

[0003] The utility model aims at providing a kind of quick clamping device of simple operation, positioning time-saving and labor-saving.

[0004] In order to realize the above-mentioned purpose, the utility model provides a kind of quick clamping device, including base, compression mechanism, first limit block and first positioning mechanism;The base is used to carry workpiece;The compression mechanism includes pressing block and first driving part, the pressing block is located above the base, the first driving part is installed to the base, the first driving part is connected with the pressing block and can drive the pressing block to descend or ascend to compress the workpiece or release the workpiece;The first limit block is fixed to the top of the base and is located at one side of the workpiece;The first positioning mechanism includes first positioning block and second driving part, the first positioning block is located above the end of the base away from the first limit block along the first direction, the second driving part is installed to the base, the second driving part is connected with the first positioning block and can drive the first positioning block to be close to the workpiece along the first direction and be stopped to the workpiece.

[0005] In some embodiments, the compression mechanism further includes rotating assembly, and the rotating assembly is connected with the pressing block and the pressing block respectively and can drive the pressing block to rotate around first axis.

[0006] Further, the rotating assembly includes connecting arm and rotating motor, the pressing block is connected to one end of the connecting arm, the rotating motor is connected to the other end of the connecting arm and can drive the connecting arm to rotate around first axis to drive the pressing block to rotate around first axis, and the upper end of the first driving part is connected with the rotating motor and can drive the rotating motor to ascend or descend to drive the pressing block to ascend or descend.

[0007] In some embodiments, the first positioning mechanism further includes guiding assembly, and the guiding assembly is connected with the first positioning block and the second driving part respectively.

[0008] Further, the guiding assembly comprises a guiding block, a guide rod, a sliding block and a fixed block, the guiding block is provided with a through hole penetrating therethrough, the fixed block is connected to the top of the base, one end of the guide rod is connected to the fixed block and the other end penetrates into the through hole, the first positioning block is connected to the side of the guiding block away from the fixed block, and the sliding block is connected to the upper end of the second driving member and located between the guiding block and the fixed block; when the second driving member drives the sliding block to descend, the sliding block can push the guiding block to slide along the guide rod to drive the first positioning block to approach the first limiting block.

[0009] Further, the side of the sliding block facing the guiding block is provided with a first sliding strip, the side of the sliding block away from the guiding block is provided with a second sliding strip, the side of the guiding block facing the sliding block is provided with a first sliding groove matched with the first sliding strip, and the side of the fixed block facing the sliding block is provided with a second sliding groove matched with the second sliding strip.

[0010] Further, the first sliding strip has a first outer side wall which extends obliquely from top to bottom and away from the guiding block, and the second sliding strip has a second outer side wall which extends obliquely from top to bottom and away from the fixed block.

[0011] Further, the lower end of the sliding block is provided with an upwardly recessed through groove, and the end of the guide rod away from the fixed block penetrates through the through groove and penetrates into the through hole.

[0012] Further, the number of the guide rods is plural, the guiding block is provided with a plurality of through holes, the sliding block is provided with a plurality of through grooves, and the plurality of guide rods, the plurality of through holes and the plurality of through grooves are in one-to-one correspondence.

[0013] In some embodiments, the second limiting block is fixed to the top of the base, and the second positioning mechanism comprises the second positioning block and a third driving member, the second positioning block is located above the end of the base away from the second limiting block in the second direction, and the third driving member is installed on the base, connected with the second positioning block and capable of driving the second positioning block to approach the workpiece in the second direction and abut against the workpiece.

[0014] The utility model discloses an embodiment of a quick clamping device compared with prior art, its beneficial effect lies in: through first limit block can carry out the preliminary positioning to the workpiece on the top of base, again through second drive piece drive first positioning block and top on the side of workpiece away from first limit block, first positioning block can with first limit block in first direction to workpiece carries out the clamping positioning, again through first drive piece drive the pressure block drop can workpiece carries out the compression positioning to improve the clamping stability of workpiece, therefore, the quick clamping device provided by the utility model can through second drive piece drive first positioning block and workpiece fast clamping positioning, and can through first drive piece drive pressure block and workpiece fast compression positioning, has the advantages such as simple operation and positioning time and effort saving. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the effect drawing when the quick clamping device of the utility model embodiment bears workpiece;

[0016] Figure 2 It is the plan view when the quick clamping device of the utility model embodiment bears workpiece;

[0017] Figure 3 It is the structure diagram of the quick clamping device of the utility model embodiment;

[0018] Figure 4 It is the front view of the quick clamping device of the utility model embodiment;

[0019] Figure 5 It is the structure diagram of compression mechanism of the utility model embodiment;

[0020] Figure 6 It is the structure diagram of first positioning mechanism of the utility model embodiment;

[0021] Figure 7 It is the structure diagram after the first positioning mechanism dismantling sliding block of the utility model embodiment;

[0022] Figure 8 It is the structure diagram of guide block of the utility model embodiment;

[0023] Figure 9 It is the structure diagram of sliding block in first angle of the utility model embodiment;

[0024] Figure 10 It is the structure diagram of sliding block in second angle of the utility model embodiment.

[0025] In the drawing, 1, base;11, support leg;

[0026] 2, pressing mechanism; 21, pressing block; 22, first driving member; 23, rotating assembly; 24, heightening support block; 231, connecting arm; 232, rotating motor;

[0027] 3, first limiting block;

[0028] 4, first positioning mechanism; 41, positioning block; 42, second driving member; 43, guiding assembly; 431, guiding block; 432, guiding rod; 433, sliding block; 434, fixing block; 435, cushion block; 4311, through hole; 4312, first sliding groove; 4313, first inner side wall; 4331, first sliding strip; 4332, second sliding strip; 4333, first outer side wall; 4334, second outer side wall; 4335, through slot; 4341, second sliding groove; 4342, second inner side wall;

[0029] 5, second limiting block;

[0030] 6, second positioning mechanism;

[0031] 7, workpiece. DETAILED DESCRIPTION

[0032] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0033] 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" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0034] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0035] In the utility model, unless another definite provision and limitation, the terms "mount", "connect", "fix", and the like terms should be understood broadly, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication or the interaction relationship of two elements inside two elements.For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, can also include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature is higher than the second feature in horizontal height.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature is less than the second feature in horizontal height.

[0037] As shown in Figures 1-4 The utility model discloses a quick clamping device, including base 1, pressure mechanism 2, first limit block 3 and first positioning mechanism 4, base 1 is used for bearing workpiece 7, pressure mechanism 2 includes pressing block 21 and first drive piece 22, pressing block 21 is located above base 1, and first drive piece 22 is installed to base 1, and first drive piece 22 is connected with pressing block 21 and can drive pressing block 21 to descend or ascend to press tightly workpiece 7 or release workpiece 7, first limit block 3 is fixed to the top of base 1 and is located at one side of workpiece 7, and first positioning mechanism 4 includes first positioning block 41 and second drive piece 42, and first positioning block 41 is located above the end of base 1 away from first limit block 3 along the first direction X, and second drive piece 42 is installed to base 1, and second drive piece 42 is connected with first positioning block 41 and can drive first positioning block 41 to be close to workpiece 7 along the first direction X and be resisted to workpiece 7.

[0038] Based on the technical scheme, through first limit block 3, workpiece 7 borne on the top of base 1 can be positioned initially, then first positioning block 41 is resisted to the side of workpiece 7 away from first limit block 3 by second drive piece 42, first positioning block 41 can be clamped and positioned with first limit block 3 to workpiece 7 in the first direction X, then workpiece 7 can be positioned tightly by driving pressing block 21 to descend by first drive piece 22 to improve the clamping stability of workpiece 7, and the operation is simple, and the positioning of workpiece 7 is time-saving and labor-saving.

[0039] The base 1 is fixedly connected with a plurality of supporting legs 11 at the bottom.

[0040] In the embodiment, the workpiece 7 is a shell type part.

[0041] In the embodiment, the first driving member 22 is a cylinder. In other embodiments, the first driving member 22 can be a linear motor, or an oil cylinder, or any other driving device capable of driving the pressing block 21 to ascend or descend.

[0042] In the embodiment, the number of the pressing mechanisms 2 is two, and the two pressing mechanisms are located at opposite ends of the top of the base 1. For the convenience of understanding, the two pressing mechanisms 2 are defined as a first pressing mechanism and a second pressing mechanism.

[0043] In other embodiments, the number of the pressing mechanisms 2 can be one, three, four, five, or any other number, which is not limited herein.

[0044] In the embodiment, the number of the first limiting blocks 3 is two, and the number of the first positioning mechanisms 4 is two. The two first limiting blocks 3 are located at one side of one end of the pressing mechanism 2 in the first direction X, and the two first positioning mechanisms 4 are located at the other side of the other end of the pressing mechanism 2 in the first direction X.

[0045] In other embodiments, the number of the first limiting blocks 3 can be one, three, four, or any other number, and the number of the first positioning mechanisms 4 can be one, three, four, or any other number, which is not limited herein.

[0046] Referring to Figures 3-5 , the pressing mechanism 2 further comprises a rotating assembly 23 connected with the pressing block 21 and capable of driving the pressing block 21 to rotate around a first axis. The rotating assembly 23 enables the pressing block 21 to rotate to a corresponding preset position, so as to adapt to the pressing and positioning needs of workpieces 7 of different structures and sizes, and has a wide range of applications.

[0047] The rotating assembly 23 comprises a connecting arm 231 and a rotating motor 232. The pressing block 21 is connected to one end of the connecting arm 231, and the rotating motor 232 is connected to the other end of the connecting arm 231 and capable of driving the connecting arm 231 to rotate around the first axis to drive the pressing block 21 to rotate around the first axis. The upper end of the first driving member 22 is connected with the rotating motor 232 and capable of driving the rotating motor 232 to ascend or descend to drive the pressing block 21 to ascend or descend.

[0048] The first axis is the central axis of the output shaft of the rotating motor 232.

[0049] In some other embodiments, the pressing block 21 is connected to one end of the connecting arm 231 through the first driving member 22, and the rotary motor 232 is connected to the other end of the connecting arm 231 and can drive the connecting arm 231 to rotate around the first axis to drive the pressing block 21 to rotate around the first axis.

[0050] The pressing mechanism 2 further comprises a heightening support block 24 fixed to the top of the base 1, and the first driving member 22 is fixed to the top of the heightening support block 24. The heightening support block 24 is used to increase the height of the first driving member 22 to adapt to the pressing positioning needs of workpieces 7 of different heights.

[0051] Referring to Figure 3 The first positioning mechanism 4 further comprises a guide assembly 43 connected to the first positioning block 41 and the second driving member 42 respectively.

[0052] In some other embodiments, the first positioning block 41 is directly connected to the output end of the second driving member 42, and the second driving member 42 directly drives the first positioning block 41 to approach or move away from the first limiting block 3.

[0053] Referring to Figures 6-10 The guide assembly 43 comprises a guide block 431, a guide rod 432, a sliding block 433 and a fixed block 434. The guide block 431 is provided with a through hole 4311 penetrating therethrough. The fixed block 434 is connected to the top of the base 1. One end of the guide rod 432 is connected to the fixed block 434, and the other end penetrates into the through hole 4311. The first positioning block 41 is connected to the side of the guide block 431 away from the fixed block 434. The sliding block 433 is connected to the upper end of the second driving member 42 and is located between the guide block 431 and the fixed block 434. When the second driving member 42 drives the sliding block 433 to descend, the sliding block 433 can push the guide block 431 to slide along the guide rod 432 to drive the first positioning block 41 to approach the first limiting block 3. The guide assembly 43 comprising the guide block 431, the guide rod 432, the sliding block 433 and the fixed block 434 has the advantages of modularized setting, low cost of consumable parts, good interchangeability, and the first positioning mechanism 4 can be reused after the quick clamping device is discarded.

[0054] The second driving member 42 is fixed below the base 1, and the output end of the second driving member 42 penetrates through the base 1 from bottom to top and is fixedly connected with the guide assembly 43.

[0055] The guide assembly 43 further comprises a pad 435, and the fixed block 434 is fixed to the top of the base 1 through the pad 435.

[0056] The first slide strip 4331 is provided on one side of the sliding block 433 facing the guide block 431, and the second slide strip 4332 is provided on the other side of the sliding block 433 away from the guide block 431. The guide block 431 is provided with a first sliding groove 4312 on the side facing the sliding block 433, which is matched with the first slide strip 4331. The fixed block 434 is provided with a second sliding groove 4341 on the side facing the sliding block 433, which is matched with the second slide strip 4332.

[0057] The first slide strip 4331 has a first outer side wall 4333 extending from top to bottom and away from the guide block 431. The second slide strip 4332 has a second outer side wall 4334 extending from top to bottom and away from the fixed block 434.

[0058] The first sliding groove 4312 has a first inner side wall 4313 matched with the first outer side wall 4333.

[0059] Specifically, the first inner side wall 4313 extends from bottom to top and away from the sliding block 433 to fit the first outer side wall 4333.

[0060] The second sliding groove 4341 has a second inner side wall 4342 matched with the second outer side wall 4334.

[0061] Specifically, the second inner side wall 4342 extends from bottom to top and away from the sliding block 433 to fit the second outer side wall 4334.

[0062] The lower end of the sliding block 433 is provided with a through groove 4335 recessed upward, and the end of the guide rod 432 away from the fixed block 434 penetrates through the through groove 4335 and into the through hole 4311. The through groove 4335 can limit and guide the sliding block 433 and the guide rod 432, so that the guide block 431 can move closer to or away from the first limiting block 3 along the guide rod 432, and the sliding block 433 can rise or fall on the preset path.

[0063] The number of guide rods 432 is multiple, the guide block 431 is provided with multiple through holes 4311, and the sliding block 433 is provided with multiple through grooves 4335. The multiple guide rods 432, the multiple through holes 4311 and the multiple through grooves 4335 are one-to-one corresponding.

[0064] In this embodiment, the number of guide rods 432 is two, the guide block 431 is provided with two through holes 4311, and the sliding block 433 is provided with two through grooves 4335.

[0065] In this embodiment, the second driving member 42 is a pneumatic cylinder. In other embodiments, the second driving member 42 can be a linear motor, an oil cylinder or other driving device capable of driving the sliding block 433 to rise or fall.

[0066] In some embodiments, referring toFigures 1-4 The quick clamping device further comprises a second limiting block 5 and a second positioning mechanism 6, the second limiting block 5 is fixed on the top of the base 1, the second positioning mechanism 6 comprises a second limiting block 61 and a third driving member, the second limiting block 61 is located above the end of the base 1 away from the second limiting block 5 along the second direction Y, and the third driving member is connected with the second limiting block 61 and can drive the second limiting block 61 to move along the second direction Y and abut against the workpiece 7.

[0067] The structure of the second positioning mechanism 6 is consistent with that of the first positioning mechanism 4.

[0068] The first direction X intersects with the second direction Y.

[0069] In the embodiment, the first direction X is perpendicular to the second direction.

[0070] In the embodiment, the number of the second limiting blocks 5 is two, the number of the second positioning mechanisms 6 is one, and the two second limiting blocks 5 are close to the first pressing mechanism, and the one second positioning mechanism 6 is close to the second pressing mechanism.

[0071] The working process of the quick clamping device is as follows: the workpiece 7 is placed on the top of the base 1 and the two side surfaces of the workpiece 7 abut against the first limiting block 3 and the second limiting block 5 respectively, so that the preliminary positioning of the workpiece 7 is completed, the second driving member 42 drives the sliding block 433 to descend to drive the guide block 431 to slide along the guide rod 432 to drive the first limiting block 41 to move along the first direction X and abut against the first limiting block 3, the first limiting block 41 and the first limiting block 3 realize the clamping and positioning of the workpiece 7 in the first direction X, the third driving member drives the second limiting block 61 to move along the second direction Y and abut against the workpiece, and the second limiting block 61 and the second limiting block 5 realize the clamping and positioning of the workpiece 7 in the second direction Y, then the rotating motor 232 drives the connecting arm 231 to rotate around the first axis to move the pressing block 21 to above the preset pressing position of the workpiece 7, the first driving member 22 drives the rotating motor 232 to descend to drive the pressing block 21 to descend and press the workpiece 7, and the pressing and positioning of the workpiece 7 are realized; after the workpiece 7 is processed, the second driving member 42 drives the sliding block 433 to ascend to the original position, the first limiting block 41 and the first limiting block 3 release the workpiece 7 in the first direction X, the output end of the third driving member returns to the original position, the second limiting block 61 and the second limiting block 5 release the workpiece 7 in the second direction Y, the first driving member 22 drives the rotating motor 232 to ascend to the original position to release the workpiece 7 by the pressing block 21, and the workpiece 7 is taken away.

[0072] In conclusion, the quick clamping device provided by the embodiment of the utility model has the following advantages

[0073] Beneficial effects:

[0074] 1、The first limiting block 3 can be used to preliminarily position the workpiece 7 on the base 1, and then the first positioning block 41 is driven by the second driving member 42 to approach and abut against the workpiece 7 along the first direction X, so that the first positioning block 41 and the first limiting block 3 can clamp and position the workpiece 7.

[0075] 2、The first driving member 22 and the pressing block 21 are adopted, the first driving member 22 can drive the pressing block 21 to descend and press the workpiece, so that the workpiece 7 is pressed and positioned, and the clamping stability of the workpiece 7 is improved.

[0076] 3、The rotating assembly 23 is adopted, so that the pressing block 21 can be rotated to a corresponding preset pressing position, so as to adapt to the pressing needs of workpieces 7 of different structures and sizes.

[0077] 4、The guiding assembly 43 is adopted, so that the first positioning block can approach and abut against the workpiece 7 along a preset travel track.

[0078] 5、The guiding assembly 43 comprising a guide block 431, a guide rod 432, a sliding block 433 and a fixed block 434 is adopted, which has the advantages of modularization, low cost of consumable parts, good interchangeability, and the first positioning mechanism 4 can also be reused after the quick clamping device is discarded.

[0079] 6、The through slot 4335 is adopted, which can play a limiting and guiding role between the sliding block 433 and the guide rod 432, so that the guide block 431 can approach or move away from the first limiting block 3 along the guide rod 432, and the sliding block 433 can rise or fall along the preset path.

[0080] 7、The second limiting block 5 and the second positioning mechanism 6 are adopted, which can realize clamping and positioning of the workpiece 7 in the second direction Y, cooperate with the first limiting block 3 and the first positioning mechanism 4 to clamp and position the workpiece 7 in the first direction X, and realize accurate positioning of the workpiece 7 on the base 1.

[0081] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be regarded as the protection range of the present application.

Claims

1. A quick clamping device, characterized in that, The utility model relates to a workpiece pressing device, which comprises a base for bearing the workpiece, a pressing mechanism, a first limiting block, a first positioning mechanism, and a rotating assembly. The pressing mechanism comprises a pressing block and a first driving member, the pressing block is located above the base, the first driving member is installed on the base, the first driving member is connected with the pressing block and can drive the pressing block to descend or ascend to press the workpiece or release the workpiece. The first limiting block is fixed on the top of the base and located on one side of the workpiece. The first positioning mechanism comprises a first positioning block and a second driving member, the first positioning block is located above one end of the base away from the first limiting block in a first direction, the second driving member is installed on the base, the second driving member is connected with the first positioning block and can drive the first positioning block to approach the workpiece in the first direction and abut against the workpiece. The pressing mechanism further comprises a rotating assembly, the rotating assembly is connected with the pressing block and the pressing block respectively and can drive the pressing block to rotate around a first axis.

2. The quick clamping device of claim 1, wherein The rotating assembly comprises a connecting arm and a rotating motor, one end of the pressing block is connected with the connecting arm, the other end of the connecting arm is connected with the rotating motor and can drive the connecting arm to rotate around the first axis to drive the pressing block to rotate around the first axis, the upper end of the first driving member is connected with the rotating motor and can drive the rotating motor to ascend or descend to drive the pressing block to ascend or descend.

3. The quick-attach device of claim 2, wherein, The first positioning mechanism further comprises a guide assembly, the guide assembly is connected with the first positioning block and the second driving member respectively.

4. The quick-attach device of claim 1, wherein, The guide assembly comprises a guide block, a guide rod, a sliding block, and a fixed block, the guide block is provided with a through hole penetrating through, the fixed block is connected with the top of the base, one end of the guide rod is connected with the fixed block and the other end penetrates into the through hole, the first positioning block is connected with the side of the guide block away from the fixed block, and the sliding block is connected with the upper end of the second driving member and located between the guide block and the fixed block.

5. The quick-attach device of claim 4, wherein, When the second driving member drives the sliding block to descend, the sliding block can push the guide block to slide along the guide rod to drive the first positioning block to approach the first limiting block. The side of the sliding block facing the guide block is provided with a first sliding strip, the side of the sliding block away from the guide block is provided with a second sliding strip, the side of the guide block facing the sliding block is provided with a first sliding groove matched with the first sliding strip, and the side of the fixed block facing the sliding block is provided with a second sliding groove matched with the second sliding strip.

6. The quick-attach device of claim 5, wherein, The first sliding strip has a first outer side wall, the first outer side wall extends obliquely from top to bottom and away from the guide block, the second sliding strip has a second outer side wall, and the second outer side wall extends obliquely from top to bottom and away from the fixed block.

7. The quick-attach device of claim 6, wherein The lower end of the sliding block is provided with an upwardly recessed through groove, and the end of the guide rod away from the fixed block penetrates through the through groove and penetrates into the through hole.

8. The quick-attach device of claim 5, wherein, The number of guide rods is multiple, the guide block is provided with multiple through holes, the sliding block is provided with multiple through grooves, and the multiple guide rods, the multiple through holes, and the multiple through grooves correspond one by one.

9. The quick-attach device of claim 8, wherein, ​ 10. The quick-attach device according to any of claims 1-9, characterized in that, The second limiting block is fixed to the top of the base, and the second positioning mechanism comprises a second positioning block and a third driving member. The second positioning block is located above one end of the base away from the second limiting block in a second direction, and the third driving member is installed on the base. The third driving member is connected with the second positioning block and can drive the second positioning block to approach the workpiece in the second direction and abut against the workpiece.

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