Clamp

Abstract

A clamp comprises a base, two guiding pieces, an extrusion driving assembly, an extrusion piece, bearing pieces and two clamping assemblies, wherein the two guiding pieces and the extrusion driving assembly are arranged on the base, the extrusion piece is connected with the extrusion driving assembly and located between the two guiding pieces, and the bearing pieces are arranged on the two guiding pieces. Sliding grooves are formed in the sides, close to each other, of the two guiding pieces. The two sides of the extrusion piece are arranged to be pushing inclined faces. The bearing piece is provided with a bearing part for bearing a workpiece and is provided with two guide grooves; each clamping assembly comprises a sliding part, a transmission part and a clamping part, the two sliding parts are arranged in the corresponding sliding grooves in a sliding mode respectively and provided with abutting inclined faces, the clamping parts are arranged in the corresponding guide grooves in a sliding mode, the transmission parts are rotationally connected with one end of the bearing part, and the two ends of each transmission part are movably connected with the corresponding sliding parts and the corresponding clamping part respectively. The sliding pieces of the clamp drive the corresponding clamping pieces to get close to each other through the corresponding transmission pieces so as to clamp the workpieces, the function of automatically clamping and positioning the workpieces is achieved, the efficiency of clamping and positioning the workpieces is improved, and the probability of damaging the workpieces by clamping is reduced.

Description

Technical Field

[0001] This application relates to the field of clamping mechanism technology, specifically to a clamp. Background Technology

[0002] When electrical discharge machining or milling is required on workpieces with curved or rectangular circumferential surfaces, fixtures are usually used to clamp and position the workpieces. Since the size and shape of the workpieces are not fixed, it is not possible to design dedicated fixtures. Currently, MUST fixtures are commonly used to clamp and position the workpieces.

[0003] However, the Max clamp requires manual operation, resulting in low workpiece clamping and positioning efficiency. Furthermore, the clamping structure of the Max clamp is fixed; when the size and shape of the workpiece vary significantly, the Max clamp's clamping and positioning accuracy is low, and the workpiece is easily damaged. Utility Model Content

[0004] In view of the above, it is necessary to propose a fixture to improve the efficiency and accuracy of workpiece clamping and positioning, and reduce the probability of workpiece damage.

[0005] This application provides a clamp, including a base, two guide members, an extruder, a carrier, two sets of clamping assemblies, and an extrusion drive assembly. The two guide members are spaced apart on the base along a first direction, and each guide member has a groove extending along the first direction on its side closest to each other. The extruder is slidably disposed on the base along a second direction perpendicular to the first direction, and is located between the two guide members. The side of the extruder facing each guide member is configured as a pushing slope. The carrier is disposed on the side of the two guide members away from the base, and has two guide grooves on its side away from the two guide members. The two guide grooves are spaced apart and extend along the first direction. The carrier also has a workpiece-bearing portion located in the two guide grooves. Between; two sets of clamping assemblies are symmetrically arranged around the extruder and correspond one-to-one with the two guide members. Each set of clamping assemblies includes a sliding member, a transmission member, and a clamping member. The sliding member is slidably disposed in the corresponding slide groove. The side of the sliding member facing the extruder has an abutting slope that abuts against the corresponding pushing slope. The clamping member is slidably disposed in the corresponding guide groove. The transmission member is rotatably connected to one end of the bearing member, and the two ends of the transmission member are movably connected to the sliding member and the clamping member, respectively. An extrusion drive assembly is disposed on the base and drivenly connected to the extruder. The extrusion drive assembly drives the extruder to simultaneously extrude the two sliding members in opposite directions, so that the two sliding members drive the corresponding clamping members to move closer to each other through the corresponding transmission members to clamp the workpiece.

[0006] The fixture in this embodiment uses a pressing drive assembly to drive the pressing element to simultaneously press two sliding elements in opposite directions. This causes the sliding elements to move their corresponding clamping elements closer together via a corresponding transmission element to clamp the workpiece, achieving automatic workpiece clamping and positioning, thus improving the fixture's efficiency. Furthermore, by movably connecting the clamping elements to the transmission element, it is easy to replace the clamping elements. When the size and shape of the workpiece change significantly, a clamping element adapted to the workpiece can be replaced to clamp and position it, thereby improving the fixture's workpiece clamping and positioning accuracy and reducing the probability of workpiece damage.

[0007] In some embodiments, the clamp further includes two stops and two sets of elastic components. The two stops correspond one-to-one with the two guides. Each stop is disposed on the corresponding guide and closes the end of the corresponding groove away from the extruder. The two sets of elastic components are disposed in the two grooves respectively. The two ends of each set of elastic components abut against the corresponding transmission member and the corresponding stop.

[0008] In some embodiments, each group of elastic components includes a retaining member and an elastic member. The retaining member is disposed between the corresponding transmission member and the corresponding stop member and abuts against the corresponding transmission member. The retaining member has a limiting groove on one side facing the corresponding stop member. The two ends of the elastic member abut against the bottom of the limiting groove and the corresponding stop member, respectively.

[0009] In some embodiments, the sliding member has a mounting groove on one side facing the corresponding abutment member, and the two groove walls of the mounting groove along the second direction have guide grooves extending along the first direction. The end of the transmission member near the corresponding sliding member extends into the mounting groove and abuts against the bottom of the mounting groove. The abutment member extends into the mounting groove and abuts against the transmission member. The abutment member has limiting protrusions on both side walls along the second direction that are opposite to the guide grooves. The limiting protrusions are slidably disposed in the corresponding guide grooves.

[0010] In some embodiments, the transmission member includes an abutment portion, a transmission portion, and a actuating portion connected end to end. The angle between the extending direction of the abutment portion and the extending direction of the transmission portion is an obtuse angle, and the angle between the extending direction of the actuating portion and the extending direction of the transmission portion is less than or equal to 90 degrees. The end of the abutment portion away from the transmission portion and the end of the actuating portion away from the transmission portion are respectively located on opposite sides of the transmission portion. The end of the actuating portion near the transmission portion is rotatably connected to the carrier member. The end of the abutment portion away from the transmission portion extends between the corresponding sliding member and the corresponding elastic component. The end of the actuating portion away from the transmission portion is movably connected to the corresponding clamping member.

[0011] In some embodiments, the clamping member has a toggle hole at one end away from the bearing portion, and the toggle portion at one end away from the transmission portion is inserted into the corresponding toggle hole.

[0012] In some embodiments, both ends of the carrier are provided with clearance grooves, each set of clamping components further includes a rotating shaft, the actuating part passes through the corresponding clearance groove, the rotating shaft passes through the corresponding transmission part along the second direction, and both ends of the rotating shaft are respectively inserted into the two groove walls of the corresponding clearance groove along the second direction.

[0013] In some embodiments, each guide groove has a limiting groove extending along the first direction on two groove walls along the second direction, and each clamping member has a guide protrusion opposite to the limiting groove on two side walls along the second direction, and the guide protrusion is slidably disposed on the corresponding limiting groove.

[0014] In some embodiments, the clamping member has a clamping plane on the side near the support portion; and / or, the clamping member has a positioning groove on the side near the support portion.

[0015] In some embodiments, the clamp further includes a repeatable positioning connection assembly mounted on the base on the side opposite to the two guide members. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the fixture provided in the embodiments of this application and its fit with the applicable workpiece.

[0017] Figure 2 yes Figure 1 The diagram shows the exploded structure of the fixture.

[0018] Figure 3 yes Figure 2 A three-dimensional structural diagram of the transmission component in the fixture shown.

[0019] Figure 4 This is an exploded view of the clamping component and the applicable workpiece of the fixture provided in another embodiment of this application.

[0020] Key component symbols: Clamp 100, Base 10, Base plate 11, Support 12, Handle 13, Repeat positioning connection assembly 20, Fixing plate 21, Connector 22, Assembly 23, Guide 30, Slide groove 31, Extrusion component 40, Pushing inclined plane 41, Extrusion drive assembly 50, Extrusion drive component 51, Air valve 52, Air pipe 53, Stop 60, Storage groove 61, Sliding slot 611, Elastic component 70, Support 71, Limiting protrusion 71 1. Limiting groove 712, elastic element 72, bearing element 80, guide groove 81, limiting groove 811, bearing part 82, clearance groove 83, clamping assembly 90, sliding element 91, abutting inclined surface 911, mounting groove 912, guide groove 9121, clamping element 92, guide protrusion 921, actuating hole 922, positioning groove 923, clamping plane 924, transmission element 93, abutting part 931, transmission part 932, actuating part 933, rotating shaft 94, workpiece 200. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] In the description of this application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, it should be noted that "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0023] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between components; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. The following will describe some embodiments of this application in detail with reference to the accompanying drawings.

[0024] Please see Figure 1 This application provides a fixture 100 for clamping and positioning a workpiece 200 so that the end face of the workpiece 200 can be subjected to electrical discharge machining, milling, or other machining operations. The shape of the peripheral surface of the workpiece 200 can be arc-shaped, rectangular, or similar. In this embodiment, the peripheral surface of the workpiece 200 is arc-shaped; however, this is not a limitation of the embodiment.

[0025] Please see Figure 1 and Figure 2 In this embodiment, the clamp 100 includes a base 10, a repeatable positioning connection assembly 20 mounted on the base 10, two guide members 30 and a pressing drive assembly 50, a pressing member 40 slidably disposed on the base 10, two stop members 60 and two sets of elastic components 70 respectively mounted on the two guide members 30, a bearing member 80 mounted on the upper surface of the two guide members 30, and two sets of clamping assemblies 90 respectively rotatably connected to both ends of the bearing member 80. The repeatable positioning connection assembly 20 is mounted on the lower surface of the base 10 and is connected to a repeatable positioning assembly (not shown). The repeatable positioning assembly is an EROWA repeatable positioning assembly or a 3R repeatable positioning assembly, thereby enabling the clamp 100 of this embodiment to have repeatable positioning and correction functions. Two guide members 30 are installed on the side of the base 10 opposite to the repeatable positioning connection assembly 20, that is, the repeatable positioning connection assembly 20 is installed on the side of the base 10 opposite to the two guide members 30. The two guide members 30 are spaced apart along a first direction, which is the length direction of the base 10. Figure 1 and Figure 2 The X-axis direction is shown. The extruder 40 is slidably disposed on the base 10 along a second direction perpendicular to the first direction, and the extruder 40 is located between the two guide members 30. The second direction is the width direction of the base 10, specifically... Figure 1 and Figure 2 The Y-axis direction is shown. The extrusion drive assembly 50 is mounted on the side of the base 10 opposite to the repeating positioning connection assembly 20, and the extrusion drive assembly 50 is drively connected to the extruder 40. Two stops 60 correspond one-to-one with two guides 30, each stop 60 being mounted on its corresponding guide 30. Two sets of elastic components 70 are respectively mounted within the two guides 30 and abut against the two stops 60. A bearing 80 is mounted on the side of the two guides 30 opposite to the base 10.

[0026] In this embodiment, the base 10 includes a base plate 11, a support member 12 mounted on the base plate 11, and two handles 13 extending horizontally outward from both sides of the base plate 11. A repeatable positioning connection assembly 20 is mounted on the lower surface of the base plate 11. Two guide members 30 and an extrusion drive assembly 50 are both mounted on the upper surface of the base plate 11, with the two guide members 30 and the extrusion drive assembly 50 positioned opposite each other. The support member 12 is located between the two guide members 30 and is block-shaped, with its size smaller than that of the extrusion member 40. By providing two handles 13, it is convenient to move the fixture 100 to the outside of the processing equipment (not shown) to clamp the workpiece 200, thereby improving the utilization rate of the processing equipment.

[0027] In this embodiment, the repeatable positioning connection assembly 20 includes a plate-shaped fixing plate 21 and a plurality of connectors 22 and an assembly 23 connected to the fixing plate 21. The fixing plate 21 abuts against the lower surface of the substrate 11. The plurality of connectors 22 are bolts and are located at the four corners of the fixing plate 21, while the assembly 23 is located in the middle of the fixing plate 21. The plurality of connectors 22 pass through the fixing plate 21 and are screwed to the substrate 11, thereby fixing the fixing plate 21 to the substrate 11. The assembly 23 passes through the fixing plate 21 and is inserted into the substrate 11. The end of the assembly 23 away from the substrate 11 is connected to the repeatable positioning assembly.

[0028] In this embodiment, each of the two guide members 30 has a groove 31 extending along the first direction on the side that is close to each other. The groove 31 passes through both ends of the corresponding guide member 30 and connects the gap between the support member 80 and the guide member 30.

[0029] In this embodiment, the extruder 40 is slidably disposed on the side of the support member 12 away from the substrate 11, and the extruder 40 is located between the two guide members 30. The side of the extruder 40 facing each guide member 30 is configured as a pushing slope 41, and the angle between the extension direction of the pushing slope 41 and the second direction is an acute angle.

[0030] In this embodiment, the extrusion drive assembly 50 includes an extrusion drive component 51 drivenly connected to the extruder 40 and an air valve 52 connected to the extrusion drive component 51 via an air pipe 53. The extrusion drive component 51 is a telescopic cylinder. Both the extrusion drive component 51 and the air valve 52 are mounted on the upper surface of the substrate 11 and are disposed opposite to the extruder 40. When the extrusion drive assembly 50 drives the extruder 40 to move in the second direction, the air valve 52 opens to supply air to the extrusion drive component 51, and the extrusion drive component 51 drives the extruder 40 to move in the second direction.

[0031] In this embodiment, both stop members 60 are plate-shaped, and each stop member 60 is installed on the corresponding guide member 30 and closes the end of the corresponding slide groove 31 away from the extruder 40. Each stop member 60 has a receiving groove 61 on the side facing the corresponding guide member 30, and the two groove walls of the receiving groove 61 along the second direction are provided with sliding slots 611 extending along the first direction.

[0032] In this embodiment, two sets of elastic components 70 are respectively disposed in two sliding grooves 31, and the two sets of elastic components 70 correspond one-to-one with two stop members 60. Each set of elastic components 70 includes a supporting member 71 and an elastic member 72. The supporting member 71 is block-shaped, and a part of the supporting member 71 extends into the corresponding receiving groove 61. The two side walls of the supporting member 71 along the second direction are provided with limiting protrusions 711 that are opposite to the sliding grooves 611. The limiting protrusions 711 are slidably disposed in the corresponding sliding grooves 611. The sliding grooves 611 and the limiting protrusions 711 cooperate to restrict the movement direction of the supporting member 71. The supporting member 71 has a limiting groove 712 on one side facing the corresponding stop member 60. The elastic member 72 is a spring. The two ends of the elastic member 72 abut against the bottom of the limiting groove 712 and the corresponding stop member 60, respectively. The setting of the limiting groove 712 improves the accuracy of installing the elastic member 72 and improves the accuracy of the elastic member 72 driving the corresponding supporting member 71 to move.

[0033] In this embodiment, the carrier 80 is installed on the side of the two guide members 30 facing away from the base 10. Two guide grooves 81 are formed on the side of the carrier 80 facing away from the two guide members 30. The two guide grooves 81 are spaced apart and extend along a first direction. The two guide grooves 81 are respectively connected to both ends of the carrier 80. Each guide groove 81 has a limiting groove 811 extending along the first direction on its two groove walls along a second direction. The limiting groove 811 has a triangular cross-sectional shape. The carrier 80 also has a carrier portion 82 for carrying the workpiece 200. The carrier portion 82 is a groove located between the two guide grooves 81, and the carrier portion 82 is connected to the two guide grooves 81 at their closest points. Both ends of the carrier 80 have clearance grooves 83, which are connected to the corresponding limiting grooves 811 and are opposite to the corresponding sliding grooves 31.

[0034] In this embodiment, two sets of clamping assemblies 90 are symmetrically arranged around the extruder 40 and correspond one-to-one with the two guide members 30. Each set of clamping assemblies 90 includes a sliding member 91, a transmission member 93 connected to the sliding member 91, a clamping member 92 connected to the transmission member 93, and a rotating shaft 94 passing through the clamping member 92.

[0035] The sliding member 91 is slidably disposed in the corresponding groove 31. The side of the sliding member 91 facing the extruder 40 has an abutment slope 911 that abuts against the corresponding pushing slope 41. Each sliding member 91 has a mounting groove 912 on the side facing the corresponding abutment member 71. The mounting groove 912 communicates with the gap between the bearing member 80 and the sliding member 91. The two groove walls of the mounting groove 912 along the second direction are provided with guide grooves 9121 extending along the first direction. The abutment member 71 extends into the mounting groove 912, and the guide groove 9121 is disposed opposite to the limiting protrusion 711. The limiting protrusion 711 is slidably disposed in the corresponding guide groove 9121.

[0036] The clamping member 92 is slidably disposed in the corresponding guide groove 81. Each clamping member 92 has guide protrusions 921 on its two side walls along the second direction, which are opposite to the limiting groove 811. The guide protrusions 921 are slidably disposed in the corresponding limiting groove 811. The cross-sectional shape of the guide protrusions 921 is also triangular, thereby improving the accuracy and stability of the clamping member 92 sliding in the corresponding guide groove 81. A turning hole 922 is provided at the end of the clamping member 92 away from the bearing part 82. A positioning groove 923 is provided on the side of the clamping member 92 near the bearing part 82. The positioning groove 923 is V-shaped, which facilitates the two clamping members 92 to clamp the workpiece 200 with an arc-shaped peripheral surface and improves the accuracy of the two clamping members 92 in clamping the workpiece 200 with an arc-shaped peripheral surface.

[0037] Please see Figure 4 In another embodiment, the clamping member 92 has a clamping plane 924 on the side near the bearing portion 82, which facilitates the two clamping members 92 to clamp the workpiece 200 with a rectangular circumferential surface and improves the accuracy of the two clamping members 92 in clamping the workpiece 200 with a rectangular circumferential surface.

[0038] In some other embodiments, the two clamping members 92 have a clamping plane 924 on the side near the bearing portion 82 and a positioning groove 923 is provided. The positioning groove 923 is provided on the clamping plane 924. This application embodiment does not specifically limit this.

[0039] Please refer to the following: Figure 2 and Figure 3In this embodiment, each transmission component 93 passes through a corresponding clearance groove 83, and two rotating shafts 94 correspond one-to-one with two clearance grooves 83. Each rotating shaft 94 passes through a corresponding transmission component 93 along a second direction, and both ends of each rotating shaft 94 are inserted into the two groove walls of the corresponding clearance groove 83 along the second direction, thereby making the two transmission components 93 rotatably connected to both ends of the bearing component 80. The end of the transmission component 93 near the corresponding sliding component 91 extends into the mounting groove 912, and the bottom of the mounting groove 912 abuts against the transmission component 93. The abutment 71 is disposed between the corresponding transmission component 93 and the corresponding stop 60 and abuts against the corresponding transmission component 93. The end of the transmission component 93 near the corresponding clamping component 92 is inserted into the corresponding actuating hole 922. It can be understood that both ends of the transmission component 93 are movably connected to the corresponding sliding component 91 and the corresponding clamping component 92, and both ends of each set of elastic components 70 abut against the corresponding transmission component 93 and the corresponding stop 60, respectively. When it is necessary to replace the clamping member 92 according to the shape and size of the workpiece 200, it is only necessary to pull the transmission member 93 out of the corresponding actuation hole 922, which makes it easy to replace the clamping member 92.

[0040] The transmission component 93 includes an abutment portion 931, a transmission portion 932, and an actuating portion 933 connected sequentially from end to end. The angle between the extending direction of the abutment portion 931 and the extending direction of the transmission portion 932 is an obtuse angle, and the angle between the extending direction of the actuating portion 933 and the extending direction of the transmission portion 932 is less than or equal to 90 degrees. The end of the abutment portion 931 away from the transmission portion 932 and the end of the actuating portion 933 away from the transmission portion 932 are located on opposite sides of the transmission portion 932, respectively. The actuating portion 933 of each transmission component 93 passes through a corresponding recess 83, and a rotating shaft 94 passes through the end of the corresponding actuating portion 933 near the transmission portion 932 along a second direction. The two ends of the rotating shaft 94 are respectively inserted into the two groove walls of the corresponding recess 83 along the second direction, thereby rotatably connecting the end of the actuating portion 933 near the transmission portion 932 to the carrier 80. One end of the abutment portion 931, away from the transmission portion 932, extends between the corresponding sliding member 91 and the corresponding elastic component 70, and both sides of the abutment portion 931 abut against the bottom of the corresponding mounting groove 912 and the corresponding holding member 71, respectively. One end of the actuating portion 933, away from the transmission portion 932, is inserted into the corresponding actuating hole 922, thereby movably connecting the end of the actuating portion 933 away from the transmission portion 932 to the corresponding clamping member 92.

[0041] The process of using the fixture 100 of this application embodiment to clamp and position the workpiece 200 generally includes:

[0042] Place workpiece 200 on the support part 82;

[0043] When the air valve 52 is opened, the extrusion drive 51 drives the extrusion 40 to simultaneously extrude the two sliding members 91 in opposite directions. The pushing slope 41 extrudes the corresponding abutting slope 911 respectively, causing the two sliding members 91 to move away from each other.

[0044] The two sliding members 91 drive the corresponding clamping members 92 to move closer to each other through the corresponding transmission members 93, so that the two clamping members 92 clamp and position the workpiece 200.

[0045] When it is necessary to clamp the workpiece 200 externally and repeatedly position the workpiece 200, the mounting part 23 is connected to the repeat positioning component to realize the repeat positioning and error correction function of the workpiece 200, thereby improving the uptime and machining accuracy of the processing equipment. In addition, after the fixture 100 of this embodiment clamps and positions the workpiece 200 once, its coordinates can be used as coarse positioning coordinates. When batch processing the workpiece 200, the coarse positioning coordinates can be used as the comparison basis for the fine machining coordinates, thereby effectively avoiding machining abnormalities caused by coordinate setting errors.

[0046] In summary, the fixture 100 of this embodiment, by setting the extrusion drive assembly 50 to drive the extrusion member 40 to simultaneously extrude two sliding members 91 in opposite directions, causes the sliding members 91 to drive the corresponding clamping members 92 to move closer together via the corresponding transmission member 93 to clamp the workpiece 200, thus realizing the function of automatically clamping and positioning the workpiece 200 and improving the efficiency of the fixture 100 in clamping and positioning the workpiece 200. In addition, by setting the clamping member 92 to be movably connected to the transmission member 93, it is easy to replace the clamping member 92. When the size and shape of the workpiece 200 change significantly, the clamping member 92 adapted to the workpiece 200 can be replaced to clamp and position the workpiece 200, thereby improving the accuracy of the fixture 100 in clamping and positioning the workpiece 200 and reducing the probability of damaging the workpiece 200.

[0047] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A clamp characterized in that, The clamp comprises a base, two guides spaced apart along a first direction on the base, each of the guides being provided with a sliding groove extending along the first direction on a side close to the other guide, a pressing member sliding along a second direction perpendicular to the first direction on the base and located between the two guides, the pressing member being provided with a pressing slope on a side facing each of the guides, a carrier provided on a side of the guides away from the base, the carrier being provided with two guide grooves on a side away from the guides, the two guide grooves being spaced apart along the first direction and extending along the first direction, the carrier further comprising a carrier portion for carrying a workpiece, the carrier portion being located between the two guide grooves, two sets of clamping assemblies symmetrically arranged about the pressing member and corresponding to the two guides respectively, each set of the clamping assemblies comprising a sliding member, a transmission member and a clamping member, the sliding member sliding in the corresponding sliding groove, the sliding member being provided with an abutting slope on a side facing the pressing member and abutting against the corresponding pressing slope, the clamping member sliding in the corresponding guide groove, the transmission member being rotatably connected to one end of the carrier, and the transmission member being movably connected to the sliding member and the clamping member at two ends thereof, and a pressing driving assembly provided on the base and drivingly connected to the pressing member, the pressing driving assembly driving the pressing member to simultaneously press the two sliding members in opposite directions, so that the two sliding members drive the corresponding clamping members to approach each other through the corresponding transmission members to clamp the workpiece. The clamp further comprises two stop members and two sets of elastic assemblies, the two stop members corresponding to the two guides respectively, each of the stop members being provided on the corresponding guide and closing an end of the corresponding sliding groove away from the pressing member, and each set of the elastic assemblies being provided in the corresponding sliding groove, two ends of each set of the elastic assemblies abutting against the corresponding transmission member and the corresponding stop member. Each set of the elastic assemblies comprises an abutting member and an elastic member, the abutting member being provided between the corresponding transmission member and the corresponding stop member and abutting against the corresponding transmission member, the abutting member being provided with a limiting groove on a side facing the corresponding stop member, and two ends of the elastic member abutting against a groove bottom of the limiting groove and the corresponding stop member. A mounting groove is provided on a side of the sliding member facing the corresponding abutting member, two groove walls of the mounting groove along the second direction are provided with guide grooves extending along the first direction, one end of the transmission member close to the corresponding sliding member extends into the mounting groove and abuts against a groove bottom of the mounting groove, the abutting member extends into the mounting groove and abuts against the transmission member, and two side walls of the abutting member along the second direction are provided with limiting protrusions arranged opposite to the guide grooves, and the limiting protrusions slidingly extend in the corresponding guide grooves. ​ ​ ​ 2. The clamp of claim 1, wherein ​ 3. The clamp of claim 2, wherein ​ 4. The clamp of claim 3, wherein ​ 5. The clamp of claim 2, wherein The transmission member comprises abutting parts, transmission parts and poking parts connected in sequence from head to tail, the included angle between the extension direction of the abutting part and the extension direction of the transmission part is obtuse, the included angle between the extension direction of the poking part and the extension direction of the transmission part is less than or equal to 90 degrees, one end of the abutting part away from the transmission part and one end of the poking part away from the transmission part are located on opposite sides of the transmission part respectively, one end of the poking part close to the transmission part is rotationally connected with the bearing member, one end of the abutting part away from the transmission part extends between the corresponding sliding member and the corresponding elastic assembly, and one end of the poking part away from the transmission part is movably connected with the corresponding clamping member.

6. The clamp of claim 5, wherein The clamping member is provided with a poking hole at one end away from the bearing part, and the poking part is inserted into the corresponding poking hole away from the transmission part.

7. The clamp of claim 5, wherein Both ends of the bearing member are provided with an avoiding slot, each set of clamping assemblies further comprises a rotating shaft, the poking part is inserted into the corresponding avoiding slot, the rotating shaft is inserted into the corresponding transmission part along the second direction, and both ends of the rotating shaft are inserted into two slot walls along the second direction in the corresponding avoiding slot.

8. The clamp of claim 1, wherein Both slot walls of each guide slot along the second direction are provided with a limiting slot extending along the first direction, and both side walls of each clamping member along the second direction are provided with a guide protrusion arranged opposite to the limiting slot, and the guide protrusion is slidably arranged in the corresponding limiting slot.

9. The clamp of claim 1, wherein The clamping member has a clamping plane on one side close to the bearing part; and / or The clamping member is provided with a positioning slot on one side close to the bearing part.

10. The clamp of claim 1, wherein The clamp further comprises a repeated positioning connecting assembly, and the repeated positioning connecting assembly is installed on one side of the base away from the two guide members.

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