Clamping device

Abstract

The utility model provides a clamping device to improve clamping convenience, and the clamping device comprises a cylinder body which is provided with a containing groove and a containing groove which are sequentially formed in the axial direction of the cylinder body and communicate with each other, and an upper air inlet groove and a lower air inlet groove which are formed in the groove wall of the containing groove and are formed in the axial direction of the cylinder body at intervals; the piston piece is arranged in the containing groove in a sliding mode and abuts against the groove wall of the containing groove; the clamping piece is movably arranged in the containing groove in a penetrating mode and connected with the piston piece, a plurality of clamping bodies are arranged at the end, away from the piston piece, of the clamping piece, and a clamping groove used for containing a workpiece is defined by the multiple clamping bodies; the air inlet assembly comprises an upper air inlet piece and a lower air inlet piece, the upper air inlet piece and the lower air inlet piece each comprise a fixing body, an elastic body and an air inlet body, the fixing bodies of the upper air inlet piece and the lower air inlet piece are inserted into the upper air inlet groove and the lower air inlet groove correspondingly and connected to the cylinder body, and the elastic bodies of the upper air inlet piece and the lower air inlet piece are arranged in the upper air inlet groove and the lower air inlet groove correspondingly. The air inlet body movably penetrates through the fixed body and abuts against the elastic body. The air inlet body is provided with a communicating groove and an opening.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece clamping, in particular to a clamping device. Background Art

[0002] A traditional clamping device is composed of a clamping member, a piston member and a cylinder body. The piston member is airtightly abutted against a sliding groove opened in the cylinder body to airtightly separate the sliding groove into a first space and a second space. The piston member drives the connected clamping member to move under the drive of the gas in the first space or the second space, so that the clamping member extends out of the cylinder body to receive the workpiece or retracts into the cylinder body, thereby clamping the workpiece.

[0003] However, the clamping device requires the use of two independently arranged air pipes to continuously deliver gas to the first space and the second space respectively. The air pipes are easily entangled with other components and interfere with other components. The position of the air pipes needs to be manually adjusted, which makes the clamping operation complicated. Utility Model Content

[0004] In view of the above situation, it is necessary to provide a clamping device to improve the convenience of clamping.

[0005] The present invention provides a clamping device, comprising:

[0006] The cylinder body is provided with a receiving groove, a containing groove, an upper air inlet groove and a lower air inlet groove, wherein the receiving groove and the containing groove are sequentially arranged and connected along the axial direction of the cylinder body, the upper air inlet groove and the lower air inlet groove are both arranged on the groove wall of the containing groove and spaced apart along the axial direction of the cylinder body, and the upper air inlet groove and the lower air inlet groove are respectively used to receive gas provided by an external air supply member;

[0007] a piston member slidably disposed in the receiving groove and abutting against a groove wall of the receiving groove to divide the receiving groove into a first space and a second space, wherein the first space is communicated with the upper air inlet groove and is used to receive the gas transported by the upper air inlet groove to drive the piston member to move away from the receiving groove, and the second space is communicated with the lower air inlet groove and is used to receive the gas transported by the lower air inlet groove to drive the piston member to move toward the receiving groove;

[0008] a clamping member movably disposed in the receiving groove and connected to the piston member, wherein the clamping member has a plurality of clamping bodies at one end away from the piston member, wherein the plurality of clamping bodies are arranged around the central axis of the clamping member to form a clamping groove for receiving a workpiece, and the clamping member moves under the drive of the piston member so that the plurality of clamping bodies clamp or release the workpiece; and

[0009] The air intake assembly comprises an upper air intake member and a lower air intake member, each of the upper air intake member and the lower air intake member comprises a fixed body, an elastic body and an air intake gas, the fixed body of the upper air intake member and the fixed body of the lower air intake member are respectively inserted into the upper air intake groove and the lower air intake groove and are respectively connected to the cylinder body, the elastic body of the upper air intake member and the elastic body of the lower air intake member are respectively arranged in the upper air intake groove and the lower air intake groove, the air intake gas movably passes through the corresponding fixed body and abuts against the corresponding elastic body, the air intake gas is provided with a connecting groove and an opening, the connecting groove is opened at one end of the air intake gas away from the corresponding elastic body, the opening is opened on the side wall of the air intake gas and is connected with the connecting groove, the air intake gas compresses the elastic body under the support of the external air supply member so that the opening moves out of the fixed body, and the gas provided by the external air supply member is transported to the upper air intake groove or the lower air intake groove through the connecting groove and the opening.

[0010] In some embodiments, the cylinder comprises:

[0011] The main body is provided with the storage slot, the accommodating slot, the upper air inlet slot and the lower air inlet slot;

[0012] A base, inserted into the receiving slot and detachably connected to the main body; and

[0013] The sealing member is sleeved on one end of the base adjacent to the main body and abuts against the groove wall of the accommodating groove.

[0014] In some embodiments, the clamping member, the piston member and the base are respectively provided with a placement hole, a through hole and a receiving hole along the axial direction of the piston member. The placement hole, the through hole and the receiving hole are coaxially arranged and connected in sequence along the axial direction of the piston member. The placement hole is connected to the clamping groove, the through hole is threadedly connected to the clamping member, and the receiving hole accommodates one end of the piston member away from the clamping member.

[0015] In some embodiments, the piston member comprises:

[0016] A guide body, wherein both ends of the guide body are movably inserted into the placement hole and the accommodating hole respectively, the guide body is provided with the through hole, and the guide body is threadedly connected to the clamping member;

[0017] A piston body, convexly disposed on the outer side of the guide body; and

[0018] The first sealing body is sleeved on the piston body and abuts against the groove wall of the accommodating groove to separate the accommodating groove into the first space and the second space.

[0019] In some embodiments, the receiving groove includes a supporting groove and a sliding groove, the supporting groove and the sliding groove are sequentially arranged and connected along the direction from the receiving groove to the accommodating groove, and the cross-sectional area of the supporting groove gradually decreases along the direction from the supporting groove to the sliding groove;

[0020] The clamping body includes a connecting portion and a clamping portion, the connecting portion is arranged at the end of the clamping member away from the piston member and is slidably arranged in the sliding groove, the clamping portion is connected to the end of the clamping member away from the piston member, and the distance between the outer side of the clamping portion and the central axis of the clamping body gradually decreases along the direction from the receiving groove to the accommodating groove.

[0021] In some embodiments, the fixed body is provided with a mounting hole, and the air inlet includes:

[0022] An air inlet portion, movably arranged through the mounting hole and provided with the communicating groove and the opening;

[0023] an abutment portion, protruding from one end of the air inlet portion adjacent to the elastic body and abutting against the elastic body, the abutment portion being configured to move closer to or away from the elastic body relative to the fixed body;

[0024] a first sealing portion, sleeved on the air inlet portion and abutting against a side of the abutting portion facing away from the elastic body, the first sealing portion being used to abut against the fixed body under the drive of the abutting portion; and

[0025] The second sealing portion is sleeved on the air inlet portion and abuts against the hole wall of the mounting hole. The second sealing portion and the first sealing portion are arranged on both sides of the opening along the direction in which the abutting portion points to the elastic body.

[0026] In some embodiments, a limiting groove is provided on the outer side of the clamping member, and the cylinder body further includes a limiting member, which is axially disposed through the main body and extends into the limiting groove to limit the clamping member.

[0027] In some embodiments, a tapered portion is provided at one end of the communicating groove away from the elastic body.

[0028] In some embodiments, the upper air intake member and the lower air intake member are spaced apart along the circumference of the cylinder body.

[0029] In some embodiments, an end of the receiving groove away from the accommodating groove is provided with a chamfer.

[0030] When the above-mentioned clamping device is in operation, first, the external air supply part presses against the intake gas of the lower air supply part to compress the corresponding elastic body, so that the opening of the lower air supply part moves out of the corresponding fixed body and connects to the lower air supply groove, and the gas provided by the external air supply part is transported to the second space through the connecting groove of the lower air supply part, the opening of the lower air supply part, and the lower air supply groove, so that the piston part drives the multiple clamping bodies to move out of the storage groove under the drive of the gas in the second space, and the multiple clamping bodies open to receive the workpieces placed in the clamping groove, and then the external air supply part withdraws from the intake gas of the lower air supply part, and the compressed elastic body of the lower air supply part provides elastic force to drive the corresponding intake gas to move into the corresponding fixed body, and move the opening into the corresponding fixed body to seal the lower air supply groove and the second space, so that the multiple clamping bodies remain in an open state, and there is no need to continuously supply gas to the second space through the air pipe to maintain the multiple clamping bodies. The piston member drives the plurality of clamping bodies into the receiving groove under the drive of the gas in the second space, and the plurality of clamping bodies shrink to clamp the workpieces placed in the clamping groove. Finally, the external air supply member withdraws from the intake gas of the upper air supply member, and the compressed elastic body of the upper air supply member provides elastic force to drive the corresponding intake gas to move into the corresponding fixed body, and moves the opening into the corresponding fixed body to seal the upper air supply groove and the first space, so that the plurality of clamping bodies remain in a contracted state, and there is no need to continuously supply gas to the first space through the air pipe to maintain the contracted state of the plurality of clamping bodies.

[0031] In this way, the external air supply part presses against the intake gas to compress the corresponding elastomer, so that the opening moves out of the corresponding fixed body, and the gas provided by the external air supply part can move into the first space connected to the upper air intake groove or the second space connected to the lower air intake groove through the connecting groove and the opening, thereby driving the piston part to drive the clamping part to move into the storage groove to clamp the workpiece or move out of the storage groove to loosen the workpiece. After the external air supply part completes the air intake operation, the compressed elastic body drives the intake gas to drive the opening to move into the fixed body, so that the opening is sealed under the blocking of the fixed body. The first space connected to the upper air intake groove or the second space connected to the lower air intake groove is sealed, so that multiple clamping bodies remain in an open state or a contracted state, and there is no need to continuously supply gas to the first space or the second space through the air pipe, thereby improving the convenience of clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the three-dimensional structure of the clamping device provided in an embodiment of the present application.

[0033] Figure 2 for Figure 1 The shown schematic cross-sectional view of the clamping device along the II-II direction.

[0034] Figure 3 for Figure 1 The shown schematic cross-sectional view of the clamping device along the III-III direction.

[0035] Figure 4 for Figure 1 Schematic diagram of the structural decomposition of the clamping device shown.

[0036] Main component symbols: clamping device 100, cylinder 10, receiving groove 11, supporting groove 111, sliding groove 112, chamfer 113, receiving groove 12, first space 121, second space 122, upper air inlet groove 13, lower air inlet groove 14, main body 15, base 16, accommodating hole 161, sealing member 17, limiting member 18, piston member 20, through hole 21, guide body 22, piston body 23, first sealing body 24, second sealing body 25, third sealing body 26, clamping member 30, clamping body 31, clamping groove 311, connecting portion 312, clamping portion 313, placement hole 32, limiting groove 33, air intake assembly 40, upper air intake member 41, fixing body 411, mounting hole 4111, elastic body 412, air intake body 413, communicating groove 4131, tapered portion 4131a, opening 4132, air intake portion 4133, abutting portion 4134, first sealing portion 4135, second sealing portion 4136, lower air intake member 42. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0038] In the description of the present application, it should be understood that the terms indicating the 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 the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection, an electrical connection, or mutual communication; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two elements or an interaction between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0041] See also Figure 1 、 Figure 2 and Figure 3 An embodiment of the present application provides a clamping device 100, including a cylinder 10, a piston member 20, a clamping member 30 and an air intake assembly 40. The clamping device 100 is used to clamp a workpiece to improve the convenience of clamping.

[0042] See also Figure 1 、 Figure 2 and Figure 3The cylinder body 10 is provided with a receiving groove 11, a receiving groove 12, an upper air inlet groove 13, and a lower air inlet groove 14. The receiving groove 11 and the receiving groove 12 are sequentially arranged and connected along the axial direction of the cylinder body 10. The upper air inlet groove 13 and the lower air inlet groove 14 are both arranged on the groove wall of the receiving groove 12 and spaced apart along the axial direction of the cylinder body 10. The upper air inlet groove 13 and the lower air inlet groove 14 are respectively used to receive gas provided by an external air supply member. The piston member 20 is slidably arranged in the receiving groove 12 and abuts the groove wall of the receiving groove 12 in an airtight manner to divide the receiving groove 12 into a first space 121 and a second space 122. The first space 121 is connected to the upper air inlet groove 13 and is used to receive gas supplied by the upper air inlet groove 13 to drive the piston member 20 to move away from the receiving groove 11. The second space 122 is connected to the lower air inlet groove 14 and is used to receive gas supplied by the lower air inlet groove 14 to drive the piston member 20 to move toward the receiving groove 11. The clamping member 30 is movably inserted into the receiving groove 11 and connected to the piston member 20. The end of the clamping member 30 away from the piston member 20 has a plurality of clamping bodies 31. The plurality of clamping bodies 31 are arranged around the central axis of the clamping member 30 to form a clamping groove 311 for receiving the workpiece. The clamping member 30 moves under the drive of the piston member 20 so that the plurality of clamping bodies 31 clamp or loosen the workpiece. The air intake assembly 40 includes an upper air intake member 41 and a lower air intake member 42, each of which includes a fixed body 411, an elastic body 412 and an air intake gas 413. The fixed body 411 of the upper air intake member 41 and the fixed body 411 of the lower air intake member 42 are respectively inserted into the upper air intake groove 13 and the lower air intake groove 14 and are respectively connected to the cylinder body 10. The elastic body 412 of the upper air intake member 41 and the elastic body 412 of the lower air intake member 42 are respectively provided in the upper air intake groove 13 and the lower air intake groove 14. The air intake gas 413 is movably provided in the corresponding fixed body 411 and presses against the upper air intake groove 13 and the lower air intake groove 14. Connected to the corresponding elastic body 412, the air inlet 413 is provided with a connecting groove 4131 and an opening 4132. The connecting groove 4131 is provided at one end of the air inlet 413 away from the corresponding elastic body 412, and the opening 4132 is provided on the side wall of the air inlet 413 and communicates with the connecting groove 4131. Under the support of the external air supply component, the air inlet 413 compresses the elastic body 412, so that the opening 4132 moves out of the fixed body 411, and the air provided by the external air supply component is delivered to the upper air inlet groove 13 or the lower air inlet groove 14 through the connecting groove 4131 and the opening 4132. For example, the material of the clamping member 30 can be spring steel, and the elastic body 412 can be a spring.

[0043] When the clamping device 100 is in operation, the external air supply member first presses against the air intake 413 of the lower air intake member 42 to compress the corresponding elastic body 412, so that the opening 4132 of the lower air intake member 42 moves out of the corresponding fixed body 411 and connects to the lower air intake groove 14. The gas provided by the external air supply member is transported to the second space 122 through the connecting groove 4131 of the lower air intake member 42, the opening 4132 of the lower air intake member 42, and the lower air intake groove 14, so that the piston member 20 drives the multiple clamping bodies 31 to move out of the receiving space 122 under the drive of the gas in the second space 122. The plurality of clamping bodies 31 are opened to receive the workpiece placed in the clamping groove 311, and then the external air supply member withdraws the air intake 413 of the lower air intake member 42, and the compressed elastic body 412 of the lower air intake member 42 provides elastic force to drive the corresponding air intake 413 to move into the corresponding fixed body 411, and the opening 4132 moves into the corresponding fixed body 411 to seal the lower air intake groove 14 and the second space 122, so that the plurality of clamping bodies 31 remain in the open state, and there is no need to continuously supply air to the second space 122 through the air pipe to maintain the plurality of clamping bodies 31. 1, and then the external air supply member presses against the intake gas 413 of the upper air inlet member 41 to compress the corresponding elastic body 412, so that the opening 4132 of the upper air inlet member 41 moves out of the corresponding fixed body 411 and connects to the upper air inlet groove 13, and the gas provided by the external air supply member is delivered to the first space 121 through the connecting groove 4131 of the upper air inlet member 41, the opening 4132 of the upper air inlet member 41, and the upper air inlet groove 13, so that the piston member 20 drives the multiple clamping bodies 31 to move into the receiving groove 11 under the drive of the gas in the second space 122, and the multiple The clamping body 31 contracts to clamp the workpiece placed in the clamping groove 311. Finally, the external air supply part withdraws from the air intake 413 of the upper air intake part 41. The compressed elastic body 412 of the upper air intake part 41 provides elastic force to drive the corresponding air intake 413 to move into the corresponding fixed body 411, and the opening 4132 moves into the corresponding fixed body 411 to seal the upper air intake groove 13 and the first space 121, so that the multiple clamping bodies 31 remain in a contracted state, and there is no need to continuously supply gas to the first space 121 through the air pipe to maintain the contracted state of the multiple clamping bodies 31.

[0044] In this way, the external air supply member presses against the air inlet 413 to compress the corresponding elastic body 412, so that the opening 4132 moves out of the corresponding fixed body 411, and the gas provided by the external air supply member moves into the first space 121 connected to the upper air inlet groove 13 or the second space 122 connected to the lower air inlet groove 14 through the connecting groove 4131 and the opening 4132, thereby driving the piston member 20 to drive the clamping member 30 to move into the receiving groove 11 to clamp the workpiece or move out of the receiving groove 11 to loosen the workpiece. After the external air supply part completes the air intake operation, the compressed elastomer 412 drives the air intake gas 413 to move the opening 4132 into the fixed body 411, so that the opening 4132 seals the first space 121 connected to the upper air intake groove 13 or the second space 122 connected to the lower air intake groove 14 under the blocking of the fixed body 411, so that the multiple clamping bodies 31 remain in an open state or a contracted state, and there is no need to continuously supply gas to the first space 121 or the second space 122 through the air pipe, thereby improving the convenience of clamping.

[0045] See also Figure 2 and Figure 4 In some embodiments, the cylinder body 10 includes a main body 15, a base 16, and a sealing member 17. The main body 15 is provided with a receiving groove 11, a receiving groove 12, an upper air inlet groove 13, and a lower air inlet groove 14. The base 16 is inserted into the receiving groove 12 and is detachably connected to the main body 15. The sealing member 17 is sleeved on an end of the base 16 adjacent to the main body 15 and abuts against the groove wall of the receiving groove 12. For example, the sealing member 17 can be a sealing ring.

[0046] Thus, by providing a detachable connection between the base 16 and the main body 15, it is easier for the operator to assemble the piston member 20 and the clamping member 30 into the cylinder body 10, thereby improving assembly convenience. In addition, by providing the sealing member 17 to abut the groove wall of the receiving groove 12, the sealing member 17 can seal the receiving groove 12, preventing the gas in the second space 122 from leaking due to the poor sealing between the main body 15 and the base 16, and ensuring that the gas in the second space 122 stably drives the movement of the piston member 20.

[0047] See also Figure 2 In some embodiments, the clamping member 30, the piston member 20 and the base 16 are respectively provided with a placement hole 32, a through hole 21 and a receiving hole 161 along the axial direction of the piston member 20. The placement hole 32, the through hole 21 and the receiving hole 161 are coaxially arranged and connected in sequence along the axial direction of the piston member 20. The placement hole 32 is connected to the clamping groove 311, the through hole 21 is threadedly connected to the clamping member 30, and the receiving hole 161 accommodates the end of the piston member 20 away from the clamping member 30.

[0048] In this way, by arranging the placement hole 32, the through hole 21 and the accommodating hole 161 coaxially and connecting them in sequence along the axial direction of the piston member 20, and arranging the placement hole 32 to be connected with the clamping groove 311, the clamping groove 311, the placement hole 32, the through hole 21 and the accommodating hole 161 can form a clamping space to accommodate a longer workpiece, thereby achieving clamping of a longer workpiece and improving the clamping adaptability.

[0049] See also Figure 2 and Figure 4 In some embodiments, the piston member 20 includes a guide body 22, a piston body 23, and a first sealing body 24. The two ends of the guide body 22 are movably inserted into the placement hole 32 and the receiving hole 161, respectively. The guide body 22 is provided with a through hole 21, and the guide body 22 is threadedly connected to the clamping member 30. The piston body 23 is protruding from the outside of the guide body 22. The first sealing body 24 is sleeved on the piston body 23 and abuts against the groove wall of the receiving groove 12 to separate the receiving groove 12 into a first space 121 and a second space 122. For example, the first sealing body 24 can be a sealing ring.

[0050] In this way, by movably inserting the two ends of the guide body 22 into the placement hole 32 and the receiving hole 161, respectively, the guide body 22 can be moved axially along the main body 15 under the constraints of the placement hole 32 and the receiving hole 161, thereby guiding the movement direction of the piston body 23, so that the piston body 23 stably drives the clamping member 30 connected to the guide body 22 to move, thereby improving the clamping stability. In addition, by providing the first sealing body 24 to abut the groove wall of the receiving groove 12, the piston body 23 can separate the receiving groove 12 into two mutually independent first spaces 121 and second spaces 122 through the first sealing body 24, thereby preventing the first space 121 and the second space 122 from communicating with each other and affecting the sealing of the first space 121 and the second space 122.

[0051] See also Figure 2 In some embodiments, the piston member 20 further includes a second sealing body 25 and a third sealing body 26. The second sealing body 25 and the third sealing body 26 are respectively sleeved on opposite ends of the guide body 22 and respectively abut against the walls of the seating hole 32 and the walls of the receiving hole 161, thereby preventing air leakage from the first space 121 and the second space 122 at the connection between the guide body 22, the seating hole 32, and the receiving hole 161. For example, the second sealing body 25 and the third sealing body 26 may be sealing rings.

[0052] See also Figure 2In some embodiments, the receiving groove 11 includes a supporting groove 111 and a sliding groove 112. The supporting groove 111 and the sliding groove 112 are sequentially arranged and connected along the direction from the receiving groove 11 to the receiving groove 12. The cross-sectional area of the supporting groove 111 gradually decreases along the direction from the supporting groove 111 to the sliding groove 112. The clamping body 31 includes a connecting portion 312 and a clamping portion 313. The connecting portion 312 is provided at the end of the clamping member 30 away from the piston member 20 and is slidably disposed within the sliding groove 112. The clamping portion 313 is connected to the end of the clamping portion 313 away from the piston member 20. The distance between the outer side of the clamping portion 313 and the central axis of the clamping body 31 gradually decreases along the direction from the receiving groove 11 to the receiving groove 12.

[0053] In this way, when the piston member 20 drives the clamping member 30 to move into the receiving groove 11, the distance between the clamping portion 313 and the groove wall of the supporting groove 111 becomes smaller and smaller, so that the clamping portion 313 shrinks and deforms under the support of the groove wall of the supporting groove 111 to clamp the workpiece. When the piston member 20 drives the clamping member 30 to move out of the receiving groove 11, the distance between the clamping portion 313 and the groove wall of the supporting groove 111 becomes larger and larger, so that the clamping portion 313 that is deformed by the support is reset to loosen the workpiece, thereby enabling the clamping body 31 to achieve the clamping and loosening operations of the workpiece.

[0054] See also Figure 2 and Figure 4 In some embodiments, the fixed body 411 is provided with a mounting hole 4111, and the air inlet 413 includes an air inlet portion 4133, an abutting portion 4134, a first sealing portion 4135, and a second sealing portion 4136. The air inlet portion 4133 is movably inserted into the mounting hole 4111 and is provided with a connecting groove 4131 and an opening 4132. The abutting portion 4134 is protruding from one end of the air inlet portion 4133 adjacent to the elastic body 412 and abuts against the elastic body 412. The abutting portion 4134 is used to move closer to or away from the elastic body 412 relative to the fixed body 411. The first sealing portion 4135 is sleeved on the air inlet portion 4133 and abuts against the side of the abutting portion 4134 facing away from the elastic body 412. The first sealing portion 4135 is used to abut against the fixed body 411 under the drive of the abutting portion 4134. The second sealing portion 4136 is sleeved on the air inlet portion 4133 and abuts against the wall of the mounting hole 4111. The second sealing portion 4136 and the first sealing portion 4135 are arranged on both sides of the opening 4132 along the direction from the abutting portion 4134 to the elastic body 412. For example, the first sealing portion 4135 and the second sealing portion 4136 can be sealing rings.

[0055] In this way, by setting the specific structure of the air intake 413, after the external air supply part completes the air supply, it retreats away from the air intake part 4133, and the compressed elastomer 412 drives the abutment part 4134 to drive the air intake part 4133 to move away from the elastomer 412, so that the abutment part 4134 abuts against the fixed body 411 to limit the movement distance of the air intake part 4133, so that the opening 4132 can be stably moved into the mounting hole 4111 of the fixed body 411, so that the first sealing part 4135 and the second sealing part 4136 abutting against the hole wall of the mounting hole 4111 respectively block the opposite sides of the opening 4132, thereby preventing the first space 121 or the second space 122 from leaking from the mounting hole 4111 and the opening 4132, thereby keeping the clamping part 30 in an open state or a contracted state, thereby improving the clamping stability and loosening stability.

[0056] Please continue reading Figure 2 and Figure 4 In some embodiments, a limiting groove 33 is provided on the outer side of the clamping member 30 , and the cylinder body 10 further includes a limiting member 18 , which is axially disposed through the main body 15 and extends into the limiting groove 33 to limit the clamping member 30 .

[0057] In this way, by setting a limiting body that passes through the main body 15 along the axial direction of the main body 15 and extends into the limiting groove 33, the limiting member 18 limits the movement direction of the clamping member 30, so that the clamping member 30 can stably move into or out of the receiving groove 11, thereby achieving stable clamping of the workpiece and improving the clamping stability.

[0058] It is understood that there can be multiple limiting grooves 33, which are spaced apart along the circumference of the clamping member 30. There can be multiple limiting members 18, and the limiting members 18 are arranged in a one-to-one correspondence with the limiting grooves 33, so as to increase the limiting area of the limiting members 18 on the clamping member 30 and thereby improve the limiting stability. The term "multiple" refers to two or more.

[0059] See also Figure 2 In some embodiments, a conical portion 4131a is provided at one end of the connecting groove 4131 away from the elastomer 412. The conical portion 4131a can guide the external air supply part during air intake, so that the external air supply part can stably abut against the air intake part 4133 and be connected to the connecting groove 4131, so that the external air supply part can stably deliver gas to the connecting groove 4131, which is beneficial to improving the clamping stability.

[0060] See also Figure 1 In some embodiments, the upper air intake member 41 and the lower air intake member 42 are arranged at intervals along the circumference of the cylinder body 10, which can make the air intake assembly 40 reasonably arranged and prevent interference between the external air supply member and the other air intake member when providing gas to one of the air intake members.

[0061] See also Figure 4 In some embodiments, a chamfer 113 is provided at one end of the receiving groove 11 away from the accommodating groove 12, which can avoid the clamping member 30 from moving into the receiving groove 11, so that the clamping member 30 can move into the receiving groove 11 stably, avoiding collision between the clamping member 30 and the main body 15.

[0062] The working process of the above-mentioned clamping device 100 is roughly as follows:

[0063] First, the external air supply member presses against the intake gas 413 of the lower air intake member 42 to compress the corresponding elastic body 412 toward the main body 15, so that the opening 4132 of the lower air intake member 42 moves out of the corresponding mounting hole 4111 of the fixing body 411, so that the communicating groove 4131 of the lower air intake member 42 is connected to the lower air intake groove 14 through the corresponding opening 4132. The gas provided by the external air supply member is transported into the second space 122 through the communicating groove 4131 of the lower air intake member 42, the opening 4132 of the lower air intake member 42, and the lower air intake groove 14. Therefore, the piston member 20, driven by the gas in the second space 122, drives the multiple clamping bodies 31 to move out of the receiving groove 11, and the multiple clamping bodies 31 open to receive the workpieces placed in the clamping groove 311.

[0064] Then, the external air supply member withdraws from the air intake 413 of the lower air intake member 42, and the compressed elastic body 412 of the lower air intake member 42 provides elastic force to drive the corresponding air intake 413 to move into the corresponding fixed body 411, and the opening 4132 moves into the corresponding fixed body 411 to seal the lower air intake groove 14 and the second space 122, so that the multiple clamping bodies 31 remain in the open state, and there is no need to continuously supply air to the second space 122 through the air pipe to maintain the open state of the multiple clamping bodies 31;

[0065] Next, the external air supply member presses against the intake gas 413 of the upper air intake member 41 to compress the corresponding elastic body 412 toward the main body 15, so that the opening 4132 of the upper air intake member 41 moves out of the corresponding mounting hole 4111 of the fixed body 411, so that the communicating groove 4131 of the upper air intake member 41 is connected to the upper air intake groove 13 through the corresponding opening 4132. The gas provided by the external air supply member is delivered to the first space 121 through the communicating groove 4131 of the upper air intake member 41, the opening 4132 of the upper air intake member 41, and the upper air intake groove 13, so that the piston member 20, driven by the gas in the second space 122, drives the multiple clamping bodies 31 to move into the receiving groove 11, and the multiple clamping bodies 31 contract to clamp the workpiece placed in the clamping groove 311.

[0066] Finally, the external air supply part withdraws from the air intake gas 413 of the upper air intake part 41, and the compressed elastic body 412 of the upper air intake part 41 provides elastic force to drive the corresponding air intake gas 413 to move into the corresponding fixed body 411, and the opening 4132 moves into the corresponding fixed body 411 to seal the upper air intake groove 13 and the first space 121, so that the multiple clamping bodies 31 remain in a contracted state. There is no need to continuously supply gas to the first space 121 through the air pipe to maintain the contracted state of the multiple clamping bodies 31, thereby improving the convenience of clamping.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A clamping device, characterized in that: include: The cylinder body is provided with a receiving groove, a containing groove, an upper air inlet groove and a lower air inlet groove, wherein the receiving groove and the containing groove are sequentially arranged and connected along the axial direction of the cylinder body, the upper air inlet groove and the lower air inlet groove are both arranged on the groove wall of the containing groove and spaced apart along the axial direction of the cylinder body, and the upper air inlet groove and the lower air inlet groove are respectively used to receive gas provided by an external air supply member; a piston member slidably disposed in the receiving groove and abutting against a groove wall of the receiving groove to divide the receiving groove into a first space and a second space, wherein the first space is communicated with the upper air inlet groove and is used to receive the gas transported by the upper air inlet groove to drive the piston member to move away from the receiving groove, and the second space is communicated with the lower air inlet groove and is used to receive the gas transported by the lower air inlet groove to drive the piston member to move toward the receiving groove; a clamping member movably disposed in the receiving groove and connected to the piston member, wherein the clamping member has a plurality of clamping bodies at one end away from the piston member, wherein the plurality of clamping bodies are arranged around the central axis of the clamping member to form a clamping groove for receiving a workpiece, and the clamping member moves under the drive of the piston member so that the plurality of clamping bodies clamp or release the workpiece; and The air intake assembly comprises an upper air intake member and a lower air intake member, each of the upper air intake member and the lower air intake member comprises a fixed body, an elastic body and an air intake gas, the fixed body of the upper air intake member and the fixed body of the lower air intake member are respectively inserted into the upper air intake groove and the lower air intake groove and are respectively connected to the cylinder body, the elastic body of the upper air intake member and the elastic body of the lower air intake member are respectively arranged in the upper air intake groove and the lower air intake groove, the air intake gas movably passes through the corresponding fixed body and abuts against the corresponding elastic body, the air intake gas is provided with a connecting groove and an opening, the connecting groove is opened at one end of the air intake gas away from the corresponding elastic body, the opening is opened on the side wall of the air intake gas and is connected with the connecting groove, the air intake gas compresses the elastic body under the support of the external air supply member so that the opening moves out of the fixed body, and the gas provided by the external air supply member is transported to the upper air intake groove or the lower air intake groove through the connecting groove and the opening.

2. The clamping device according to claim 1, characterized in that The cylinder body comprises: The main body is provided with the storage slot, the accommodating slot, the upper air inlet slot and the lower air inlet slot; A base, inserted into the receiving slot and detachably connected to the main body; and The sealing member is sleeved on one end of the base adjacent to the main body and abuts against the groove wall of the accommodating groove.

3. The clamping device according to claim 2, characterized in that The clamping member, the piston member and the base are respectively provided with a placement hole, a through hole and a receiving hole along the axial direction of the piston member. The placement hole, the through hole and the receiving hole are coaxially arranged and connected in sequence along the axial direction of the piston member. The placement hole is connected to the clamping groove, the through hole is threadedly connected to the clamping member, and the receiving hole accommodates one end of the piston member away from the clamping member.

4. The clamping device according to claim 3, characterized in that The piston member comprises: A guide body, wherein both ends of the guide body are movably inserted into the placement hole and the accommodation hole respectively, the guide body is provided with the through hole, and the guide body is threadedly connected to the clamping member; A piston body, convexly disposed on the outer side of the guide body; and The first sealing body is sleeved on the piston body and abuts against the groove wall of the accommodating groove to separate the accommodating groove into the first space and the second space.

5. The clamping device according to claim 1, wherein: The receiving groove includes a supporting groove and a sliding groove, the supporting groove and the sliding groove are sequentially arranged and connected along the direction from the receiving groove to the receiving groove, and the cross-sectional area of the supporting groove gradually decreases along the direction from the supporting groove to the sliding groove; The clamping body includes a connecting portion and a clamping portion, the connecting portion is arranged at the end of the clamping member away from the piston member and is slidably arranged in the sliding groove, the clamping portion is connected to the end of the clamping member away from the piston member, and the distance between the outer side of the clamping portion and the central axis of the clamping body gradually decreases along the direction from the receiving groove to the accommodating groove.

6. The clamping device according to claim 1, wherein: The fixed body is provided with a mounting hole, and the air inlet comprises: An air inlet portion, movably arranged through the mounting hole and provided with the communicating groove and the opening; an abutment portion, protruding from one end of the air inlet portion adjacent to the elastic body and abutting against the elastic body, the abutment portion being configured to move closer to or away from the elastic body relative to the fixed body; a first sealing portion, sleeved on the air inlet portion and abutting against a side of the abutting portion facing away from the elastic body, the first sealing portion being used to abut against the fixed body under the drive of the abutting portion; and The second sealing portion is sleeved on the air inlet portion and abuts against the hole wall of the mounting hole. The second sealing portion and the first sealing portion are arranged on both sides of the opening along the direction in which the abutting portion points to the elastic body.

7. The clamping device according to claim 2, characterized in that A limiting groove is provided on the outer side of the clamping member, and the cylinder body further comprises a limiting member, which is penetrated through the main body along the axial direction of the main body and extends into the limiting groove to limit the clamping member.

8. The clamping device according to claim 1, wherein: A tapered portion is provided at one end of the communicating groove away from the elastic body.

9. The clamping device according to claim 1, wherein: The upper air intake member and the lower air intake member are spaced apart along the circumferential direction of the cylinder body.

10. The clamping device according to claim 1, wherein: An end of the receiving groove away from the accommodating groove is provided with a chamfer.

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