Clamp

Abstract

The invention relates to a clamp which comprises a clamping assembly and an opening and closing driving mechanism. The opening and closing driving mechanism comprises an opening and closing assembly and a first driving assembly, the opening and closing assembly comprises a piston rod and wedge-shaped blocks, one end of the piston rod is provided with wedge-shaped grooves corresponding to the sliding blocks of the clamping assembly, the number of the wedge-shaped blocks is equal to that of the wedge-shaped grooves, the wedge-shaped blocks are arranged in the wedge-shaped grooves in a one-to-one correspondence mode, and the wedge-shaped blocks are connected to the sliding blocks in a one-to-one correspondence mode. The first driving assembly is connected to the piston rod and used for driving the piston rod to move in the axial direction of the piston rod. Axial driving force is provided through the first driving assembly, the wedge-shaped block is matched with the wedge-shaped groove, the piston rod can stay at different heights, axial movement is converted into radial clamping movement, and the adjustable stroke ranging from 1 mm to 7 mm is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing, in particular to a clamp. Background Art

[0002] Pneumatic grippers, also known as pneumatic jaws or pneumatic fingers, primarily utilize compressed air as a power source to grip or grasp workpieces. However, pneumatic grippers have a limited gripping stroke, making them inflexible for workpieces of varying sizes and requiring frequent replacement of gripper components. Furthermore, increasing the gripping stroke significantly reduces the gripping force due to the shortened gripper arm, making it difficult to achieve both a long gripping stroke and a strong grip. Summary of the Invention

[0003] Based on the above description, the present invention provides a clamp, which aims to solve the problem of limited clamping stroke of existing pneumatic fingers.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A clamp comprising: Clamping assembly; The opening and closing drive mechanism includes an opening and closing component and a first drive component. The opening and closing component includes a piston rod and a wedge block. One end of the piston rod is provided with a wedge groove corresponding to each slider of the clamping assembly. The number of the wedge blocks is equal to the number of the wedge grooves. The wedge blocks are arranged in the wedge grooves in a one-to-one correspondence. The wedge blocks are connected to the sliders in a one-to-one correspondence. The first drive component is connected to the piston rod. The first drive component is used to drive the piston rod to move axially along the piston rod.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows.

[0006] Furthermore, the wedge angle of the wedge groove and the wedge angle of the wedge block are 15°~18°.

[0007] Furthermore, the first drive assembly includes a first cylinder body and a first piston, the first cylinder body has a first accommodating chamber and a first fluid channel and a second fluid channel connected to the first accommodating chamber, the first fluid channel and the second fluid channel are arranged in sequence along the axial direction of the first cylinder body, the clamping assembly is arranged at one end of the first cylinder body, the opening and closing assembly is arranged in the first accommodating chamber, and the first piston is sleeved on the other end of the piston rod.

[0008] Furthermore, the first driving assembly includes a magnet, the magnet is provided on the first piston, and an induction component is installed on the side wall of the first accommodating cavity.

[0009] Furthermore, the first driving assembly includes a sealing ring, and the sealing ring is provided on the first piston.

[0010] Furthermore, it includes an ejection mechanism, which is arranged at the other end of the first cylinder body and is used to eject the workpiece clamped by the clamping claws of the clamping assembly.

[0011] Furthermore, the ejection mechanism includes a push rod and a second drive assembly, a through hole connected to the first accommodating chamber is provided on the disc of the clamping assembly, a first through hole is provided on the piston rod, and a second through hole is provided at the other end of the first cylinder body. One end of the push rod passes through the second through hole and the first through hole in sequence and extends into the through hole, the second drive assembly is provided at the other end of the first cylinder body, and the second drive assembly is connected to the other end of the push rod.

[0012] Furthermore, the ejection mechanism includes a second drive assembly, which includes a second cylinder body, a second piston and an elastic member. The second cylinder body has a second accommodating chamber and a third fluid channel connected to the second accommodating chamber. The second cylinder body is close to the first cylinder body. A third through hole connected to the second accommodating chamber is opened at one end, and the second piston is arranged in the second accommodating chamber. The other end of the push rod passes through the third through hole and is connected to the second piston. The elastic member is sleeved on the push rod. One end of the elastic member abuts against the second piston, and the other end of the elastic member abuts against the wall of the second accommodating chamber relative to the second piston.

[0013] Furthermore, the elastic member is a spring.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: (1) The present application provides an axial driving force through a first driving assembly, so that the wedge block cooperates with the wedge groove, which can make the piston rod stay at different heights, convert the axial motion into radial clamping motion, and achieve an adjustable stroke of 1mm~7mm.

[0015] (2) This application applies thrust to the workpiece through the ejection mechanism when the clamping assembly needs to place the workpiece, so as to achieve precise placement of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a clamp provided in an embodiment of the present invention; Figure 2 A cross-sectional view of a clamping assembly of a clamp provided in an embodiment of the present invention in an open state; Figure 3 A cross-sectional view of a clamping assembly of a clamp provided in an embodiment of the present invention in a closed state; Figure 4 This is a structural diagram of an opening and closing assembly in an embodiment of the present invention; Figure 5 Schematic diagram of the structure of the piston rod in an embodiment of the present invention; Figure 6 Schematic diagram of the structure of the wedge block in an embodiment of the present invention.

[0018] Description of reference numerals: 10. Clamping assembly; 11. Slider; 12. Clamping claw; 13. Disc; 20. Opening and closing drive mechanism; 21. Opening and closing assembly; 211. Piston rod; 2111. Wedge-shaped groove; 2112. First through hole; 212. Wedge block; 22. First driving assembly; 221. First cylinder; 2211. First accommodating chamber; 2212. First fluid channel; 2213. Second fluid channel; 222. First piston; 223. Magnet; 224. Sealing ring; 30. Ejection mechanism; 31. Push rod; 32. Second drive assembly; 321. Second cylinder; 3211. Second accommodating chamber; 3212. Third fluid channel; 322. Second piston; 323. Elastic member. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0021] It will be understood that spatial relational terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be understood that in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under" or "beneath" or "beneath" the other elements will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0022] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0023] Reference Figures 1 to 6 As shown, the present invention provides a technical solution: a clamp, including a clamping assembly 10 and an opening and closing drive mechanism 20; the opening and closing drive mechanism 20 includes an opening and closing assembly 21 and a first drive assembly 22, the opening and closing assembly 21 includes a piston rod 211 and a wedge block 212, one end of the piston rod 211 corresponds to each slider 11 of the clamping assembly 10 to open a wedge groove 2111, the number of wedge blocks 212 is equal to the number of wedge grooves 2111, the wedge blocks 212 are arranged in the wedge grooves 2111 one by one, the wedge blocks 212 are connected to the slider 11 one by one, the first drive assembly 22 is connected to the piston rod 211, and the first drive assembly 22 is used to drive the piston rod 211 to move along the axial direction of the piston rod 211.

[0024] Exemplarily, the first driving assembly 22 may be a pneumatic cylinder, a hydraulic cylinder, or an electric push rod 31 .

[0025] In this embodiment, when the first drive assembly 22 drives the piston rod 211 to move axially, the wedge block 212 slides along the wedge groove 2111, causing the wedge block 212 to drive the slider 11 of the clamping assembly 10 to slide radially, thereby opening and closing the fingers of the clamping assembly 10. Through the cooperation between the wedge groove 2111 and the wedge block 212, the piston rod 211 stops at different heights, converting axial motion into radial clamping motion, achieving an adjustable stroke of 1 mm to 7 mm.

[0026] When the first drive assembly 22 drives the piston rod 211 downward, it pushes the wedge block 212 toward the axis of the piston rod 211, causing the multiple fingers of the clamping assembly 10 to close and clamp the workpiece. When the first drive assembly 22 drives the piston rod 211 upward, it pushes the wedge block 212 away from the axis of the piston rod 211, causing the multiple fingers of the clamping assembly 10 to open and clamp the workpiece.

[0027] Optionally, the wedge angle of the wedge groove 2111 and the wedge angle of the wedge block 212 are 15° to 18°.

[0028] Exemplarily, the wedge angle of the wedge groove 2111 and the wedge angle of the wedge block 212 are 15°.

[0029] In this embodiment, optimal conversion between force and stroke can be achieved through a specific wedge angle range.

[0030] Reference Figures 1 to 3 As shown, in some embodiments, the first drive assembly 22 includes a first cylinder 221 and a first piston 222. The first cylinder 221 has a first accommodating chamber 2211 and a first fluid channel 2212 and a second fluid channel 2213 connected to the first accommodating chamber 2211. The first fluid channel 2212 and the second fluid channel 2213 are arranged in sequence along the axial direction of the first cylinder 221. The clamping assembly 10 is arranged at one end of the first cylinder 221, the opening and closing assembly 21 is arranged in the first accommodating chamber 2211, and the first piston 222 is sleeved on the other end of the piston rod 211.

[0031] Illustratively, the first piston 222 has an initial position and an end position when moving in the first accommodating chamber 2211 , and the second fluid channel 2213 and the first fluid channel 2212 correspond one-to-one to the initial position and the end position.

[0032] In this embodiment, the first fluid channel 2212 and the second fluid channel 2213 are connected to an external fluid input device. When fluid is input from the first fluid channel 2212 to the first accommodating chamber 2211, the piston rod 211 is driven downward, causing the multiple fingers of the clamping assembly 10 to close. When fluid is input from the second fluid channel 2213 to the first accommodating chamber 2211, the piston rod 211 is driven upward, causing the multiple fingers of the clamping assembly 10 to open. This dual-channel control enables precise reciprocating motion, allowing precise adjustment of the travel of the multiple fingers of the clamping assembly 10.

[0033] In other embodiments, the piston rod 211 is configured in a stepped shape, the first accommodating chamber 2211 is configured in an I-shape, the first accommodating chamber 2211 is divided into a first cavity and a second cavity, the piston rod 211 is located in the first cavity, the other end of the piston rod 211 extends into the second cavity, the first piston 222 is located in the second cavity, and the first fluid channel 2212 and the second fluid channel 2213 correspond to the second cavity.

[0034] Illustratively, the first piston 222 has an initial position and an end position when moving in the second cavity.

[0035] In this embodiment, the piston rod 211 and the first accommodating cavity 2211 are configured into a specific shape to limit the movement of the piston rod 211 .

[0036] Reference Figures 2 to 3 As shown, in some embodiments, the first driving assembly 22 includes a magnet 223 , the magnet 223 is provided on the first piston 222 , and a sensing element is installed on the side wall of the first accommodating cavity 2211 .

[0037] For example, the sensing element may be an induction switch or the like.

[0038] In this embodiment, when the piston moves, the magnet 223 moves with the piston, and the sensing element detects the position of the magnet 223 , so that the position of the magnet 223 can be used to determine whether the multiple fingers of the clamping assembly 10 clamp the workpiece.

[0039] Reference Figures 2 to 3 As shown, in some embodiments, the first driving assembly 22 includes a sealing ring 224 , which is disposed on the first piston 222 .

[0040] In this embodiment, the sealing ring 224 is deformed under pressure to fill the gap between the piston and the first cylinder body 221, so as to improve the sealing performance between the piston and the first cylinder body 221, prevent fluid leakage, and ensure stable driving force on the piston.

[0041] Reference Figures 1 to 3 As shown, in some embodiments, the clamp includes an ejection mechanism 30 , which is disposed at the other end of the first cylinder 221 . The ejection mechanism 30 is used to eject the workpiece clamped by the clamping jaws 12 of the clamping assembly 10 .

[0042] In this embodiment, when the clamping assembly 10 needs to place a workpiece, the ejection mechanism 30 applies a thrust to the workpiece to achieve accurate placement of the workpiece.

[0043] Reference Figures 2 to 3As shown, in some embodiments, the ejection mechanism 30 includes a push rod 31 and a second drive assembly 32, a through hole communicating with the first accommodating chamber 2211 is provided on the disc 13 of the clamping assembly 10, a first through hole 2112 is provided on the piston rod 211, and a second through hole is provided at the other end of the first cylinder body 221. One end of the push rod 31 passes through the second through hole and the first through hole 2112 in sequence and extends into the through hole, the second drive assembly 32 is provided at the other end of the first cylinder body 221, and the second drive assembly 32 is connected to the other end of the push rod 31.

[0044] Exemplarily, the second driving assembly 32 may be a pneumatic cylinder, a hydraulic cylinder, or an electric push rod 31 .

[0045] In this embodiment, the second driving assembly 32 provides an axial driving force to move the push rod 31 along the axial direction of the through hole, so that the push rod 31 performs an ejection action.

[0046] Reference Figures 2 to 3 As shown, in some embodiments, the ejection mechanism 30 includes a second drive assembly 32, which includes a second cylinder body 321, a second piston 322 and an elastic member 323. The second cylinder body 321 has a second accommodating chamber 3211 and a third fluid channel 3212 connected to the second accommodating chamber 3211. The second cylinder body 321 is provided with a third through hole connected to the second accommodating chamber 3211 at one end close to the first cylinder body 221. The second piston 322 is arranged in the second accommodating chamber 3211. The other end of the push rod 31 passes through the third through hole and is connected to the second piston 322. The elastic member 323 is sleeved on the push rod 31. One end of the elastic member 323 abuts against the second piston 322, and the other end of the elastic member 323 abuts against the wall of the second accommodating chamber 3211 relative to the second piston 322.

[0047] Exemplarily, the elastic member 323 may be a spring or an elastic rubber ring.

[0048] In this embodiment, the third fluid channel 3212 is connected to an external fluid input device. To eject a workpiece, fluid is fed from the third fluid channel 3212 into the second accommodating chamber 3211, pushing the second piston 322 and driving the push rod 31 toward the workpiece. This causes the elastic member 323 to deform, exerting a thrust force on the workpiece. This independent channel controls the ejection action, making the ejection stroke adjustable and the pressure controllable.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A clamp, characterized in that: include: Clamping assembly (10); An opening and closing drive mechanism (20) comprises an opening and closing assembly (21) and a first drive assembly (22), wherein the opening and closing assembly (21) comprises a piston rod (211) and a wedge block (212), one end of the piston rod (211) corresponding to each slider (11) of the clamping assembly (10) is provided with a wedge groove (2111), the number of the wedge blocks (212) being equal to the number of the wedge grooves (2111), the wedge blocks (212) being arranged in a one-to-one correspondence within the wedge grooves (2111), the wedge blocks (212) being connected to the sliders (11) in a one-to-one correspondence, the first drive assembly (22) being connected to the piston rod (211), and the first drive assembly (22) being used to drive the piston rod (211) to move along the axial direction of the piston rod (211).

2. The clamp according to claim 1, characterized in that The wedge angle of the wedge groove (2111) and the wedge angle of the wedge block (212) are 15° to 18°.

3. The clamp according to claim 1, characterized in that The first driving assembly (22) includes a first cylinder (221) and a first piston (222). The first cylinder (221) has a first accommodating chamber (2211) and a first fluid channel (2212) and a second fluid channel (2213) connected to the first accommodating chamber (2211). The first fluid channel (2212) and the second fluid channel (2213) are arranged in sequence along the axial direction of the first cylinder (221). The clamping assembly (10) is arranged at one end of the first cylinder (221), the opening and closing assembly (21) is arranged in the first accommodating chamber (2211), and the first piston (222) is sleeved on the other end of the piston rod (211).

4. The clamp according to claim 3, characterized in that The first driving assembly (22) comprises a magnet (223), the magnet (223) being arranged on the first piston (222), and an induction component being installed on the side wall of the first accommodating cavity (2211).

5. The clamp according to claim 3, characterized in that The first drive assembly (22) comprises a sealing ring (224), and the sealing ring (224) is provided on the first piston (222).

6. The clamp according to any one of claims 3 to 5, characterized in that: It comprises an ejection mechanism (30), the ejection mechanism (30) being arranged at the other end of the first cylinder (221), and the ejection mechanism (30) being used to eject a workpiece clamped by the clamping claw (12) of the clamping assembly (10).

7. The clamp according to claim 6, characterized in that The ejection mechanism (30) includes a push rod (31) and a second drive assembly (32); a through hole communicating with the first accommodating chamber (2211) is provided on the disc (13) of the clamping assembly (10); a first through hole (2112) is provided on the piston rod (211); a second through hole is provided at the other end of the first cylinder body (221); one end of the push rod (31) passes through the second through hole and the first through hole (2112) in sequence and extends into the through hole; the second drive assembly (32) is provided at the other end of the first cylinder body (221); and the second drive assembly (32) is connected to the other end of the push rod (31).

8. The clamp according to claim 7, characterized in that The ejection mechanism (30) includes a second drive assembly (32), the second drive assembly (32) includes a second cylinder (321), a second piston (322) and an elastic member (323), the second cylinder (321) has a second accommodating chamber (3211) and a third fluid channel (3212) communicating with the second accommodating chamber (3211), the second cylinder (321) is provided with a third through hole communicating with the second accommodating chamber (3211) at one end close to the first cylinder (221), the second piston (322) is arranged in the second accommodating chamber (3211), the other end of the push rod (31) passes through the third through hole and is connected to the second piston (322), the elastic member (323) is sleeved on the push rod (31), one end of the elastic member (323) abuts against the second piston (322), and the other end of the elastic member (323) abuts against the wall of the second accommodating chamber (3211) relative to the second piston (322).

9. The clamp according to claim 8, characterized in that The elastic member (323) is a spring.

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