A high-capacity rotary clamp

Abstract

The present invention provides a high-capacity rotary clamp, comprising: a cylinder, an end cover, a piston rod, a piston, a clamp and a middle cover; the end cover comprises a front cover and a rear cover, the front cover and the rear cover are respectively fixed at the front end and the rear end of the cylinder, the double-force piston is provided with a plurality of inclined grooves on the side facing the front cover, a steel ball is placed in each inclined groove, a first pin and a second pin are provided on the rear cover, the piston rod is provided with two rotation grooves on one side of the rear cover, one end of the first pin and the second pin is located in the rear cover and the other end is located in the rotation groove. The present invention can achieve unequal clamping force and holding force, so that the workpiece is not easily crushed or deformed during the clamping process; under the condition of the same volume, the present solution can provide greater clamping force and holding force; the smaller the volume, the smaller the required installation space.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing and industrial automation press-fitting, and in particular to a high-capacity rotary clamp. Background Art

[0002] In the field of mechanical processing and industrial automation press-fitting, it is often necessary to clamp and fix the workpiece for mechanical processing or press-fitting. Since the workpiece needs to resist the cutting force of the tool, the extrusion force of the press, and some external forces such as vibration during mechanical processing and press-fitting, the force used to clamp and fix the workpiece is a strong and stable force to ensure that the workpiece remains absolutely still on the workbench as much as possible to ensure the processing accuracy or press-fitting accuracy of the workpiece. According to the existing technical situation, hydraulic clamping mechanisms or pneumatic clamping mechanisms with larger cylinder diameters are often selected to achieve a greater clamping force. However, these clamping mechanisms, first of all, have equal clamping force and holding force, that is, the magnitude of the force output when the existing mechanism is clamped is equal to the magnitude of the reaction force that resists its loosening. This results in that when it is required to resist a larger loosening force, that is, when a larger holding force is required, the clamping force of the workpiece also becomes larger accordingly, which can easily crush the workpiece and even cause visible deformation. Secondly, when choosing these existing mechanisms, a relatively large installation space is required, because the product with large clamping force is relatively large in size, and the installation space required is large, which is not suitable for the narrow machine tool processing space and press installation space. Therefore, it is necessary to design a product that can achieve both the double force clamping function and the multi-force holding function. Summary of the invention

[0003] In view of more than one problem existing in the prior art, the present invention provides a high-capacity rotary clamp.

[0004] To achieve the above object, the specific scheme of the present invention is as follows:

[0005] The present invention provides a high-capacity rotary clamp, comprising: a cylinder, an end cover, a piston rod, a piston, a clamp and a middle cover;

[0006] The end cover comprises a front end cover, a middle cover and a rear end cover, the front end cover and the rear end cover are respectively fixed to the front end and the rear end of the cylinder barrel, the front end cover is provided with a through hole, the piston rod passes through the through hole on the front end cover and is connected with the clamp, the piston comprises a double-force piston and a rotary piston, the double-force piston is movably mounted on the piston rod on the side close to the front end cover, the rotary piston is fixedly mounted on the piston rod on the side close to the rear end cover, the double-force piston, the rotary piston, the piston rod and the cylinder barrel are airtightly sealed, a middle cover is provided on the piston rod between the double-force piston and the rotary piston, the middle cover is fixed on the cylinder barrel, a clamping air supply port is provided on the inner wall of the cylinder barrel between the double-force piston and the rotary piston, and a release air supply port is provided on the inner wall of the cylinder barrel between the rotary piston and the rear end cover;

[0007] The double-force piston is provided with a plurality of inclined grooves on the side facing the front end cover, and a steel ball is placed in each inclined groove. The rear end cover is provided with a first pin and a second pin, and the first pin and the second pin are centrally symmetrical with the center of the circle of the rear end cover as the center. The piston rod is provided with two rotation grooves on one side of the rear end cover, and one end of the first pin and the second pin is located in the rear end cover and the other end is located in the rotation groove.

[0008] Preferably, a self-lubricating bearing is provided between the front end cover and the piston rod.

[0009] Preferably, a U-shaped sealing ring is arranged between the front end cover and the piston rod, and the U-shaped opening direction of the U-shaped sealing ring faces the inside of the cylinder.

[0010] Preferably, a first O-ring is arranged between the front end cover and the cylinder barrel; and a second O-ring is arranged between the rear end cover and the cylinder barrel.

[0011] Preferably, a third O-ring is arranged between the double-force piston and the piston rod, a fourth O-ring is arranged between the rotary piston and the piston rod, a fifth O-ring is arranged between the double-force piston and the inner wall of the cylinder, and a sixth O-ring is arranged between the rotary piston and the inner wall of the cylinder.

[0012] Preferably, the front end cover is fixed to the front end of the cylinder barrel by a first retaining spring, and the rear end cover is fixed to the rear end of the cylinder barrel by a second retaining spring.

[0013] Preferably, a magnetic ring mounting seat is sleeved on the side of the rotary piston close to the front end cover, a magnetic ring is arranged between the magnetic ring mounting seat and the rotary piston, a third pin is arranged through the magnetic ring mounting seat, the rotary piston and the piston rod, and a first hexagon socket screw and a second hexagon socket screw are respectively arranged at both ends of the third pin to prevent the third pin from falling off.

[0014] Preferably, a third hexagon socket screw is provided between the rear end cover and the cylinder barrel to prevent relative rotation between the rear end cover and the cylinder barrel.

[0015] Preferably, a front cover insert is provided between the front cover and the double force piston to prevent the steel ball from moving toward the front cover.

[0016] Preferably, an anti-rotation sleeve is provided between the first pin, the second pin and the rear end cover to increase the stability of the first pin and the second pin.

[0017] The technical solution of the present invention has the following beneficial effects:

[0018] 1. It can achieve inequality between the clamping force and the holding force, that is, the magnitude of the force during clamping is not equal to the magnitude of the reaction force resisting its loosening, so that the workpiece is not easily crushed or deformed during the clamping process;

[0019] 2. In the preferred solution, under the condition of the same volume, this solution can provide greater clamping force and holding force;

[0020] 3. In the preferred solution, the volume is smaller and the required installation space is correspondingly smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view from the AA perspective of a specific embodiment of the present invention;

[0022] Figure 2 is a stereogram of a specific embodiment of the present invention;

[0023] Figure 3 is a bottom view of a specific embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of a piston rod, a multiplier piston and a rotary piston after the cylinder barrel is removed according to a specific embodiment of the present invention.

[0025] Notes on the attached drawings:

[0026] 1-cylinder, 2-piston rod, 201-rotating groove, 3-piston, 301-double force piston, 302-rotating piston, 303-oblique groove, 304-steel ball, 309-third O-type sealing ring, 311-fifth O-type sealing ring, 305-magnetic ring mounting seat, 306-magnetic ring, 307-third pin, 308-first hexagon socket screw, 310-fourth O-type sealing ring, 312-sixth O-type sealing ring Sealing ring, 4-end cover, 401-front end cover, 402-middle cover, 403-rear end cover, 404-self-lubricating bearing, 405-U-type sealing ring, 406-front cover insert; 407-first O-type sealing ring, 408-third hexagon socket screw, 409-second O-type sealing ring, 410-first pin, 411-second pin, 412-anti-rotation sleeve, 501-first retaining spring, 502-second retaining spring. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "front", "back", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] Combination Figure 1-Figure 4 As shown, the present invention provides a high-capacity rotary clamp, comprising: a cylinder 1, an end cover, a piston rod 2, a piston 3, a clamp and a middle cover 402;

[0032] The end cover includes a front end cover 401, a middle cover 402 and a rear end cover 403, the front end cover 401 and the rear end cover 403 are respectively fixed to the front end and the rear end of the cylinder 1, the front end cover 401 is provided with a through hole, the piston rod 2 passes through the through hole on the front end cover 401 and is connected to the clamp, the piston 3 includes a double force piston 301 and a rotary piston 302, the double force piston 301 is movably mounted on the side of the piston rod 2 close to the front end cover 401, and the rotary piston 302 is fixedly mounted on the side of the piston rod 2 close to the front end cover 401 On one side of the rear end cover 403, the double-force piston 301, the rotary piston 302, the piston rod 2 and the cylinder barrel 1 are hermetically sealed, a middle cover 402 is provided on the piston rod 2 between the double-force piston 301 and the rotary piston 302, the middle cover 402 is fixed on the cylinder barrel 1, a clamping air supply port is provided on the inner wall of the cylinder barrel 1 between the double-force piston 301 and the rotary piston 302, and a release air supply port is provided on the inner wall of the cylinder barrel 1 between the rotary piston 302 and the rear end cover 403;

[0033] The double-force piston 301 is provided with a plurality of inclined grooves 303 on the side facing the front end cover 401, and a steel ball 304 is placed in each inclined groove 303. The rear end cover 403 is provided with a first pin 410 and a second pin 411, and the first pin 410 and the second pin 411 are centrally symmetrical with the center of the circle of the rear end cover 403 as the center. Two rotation grooves 201 are provided on the side of the piston rod 2 close to the rear end cover 403, and one end of the first pin 410 and the second pin 411 are located in the rear end cover 403 and the other end is located in the rotation groove 201.

[0034] A self-lubricating bearing 404 is provided between the front end cover 401 and the piston rod 2. A U-shaped sealing ring 405 is also provided between the front end cover 401 and the piston rod 2, and the U-shaped opening direction of the U-shaped sealing ring 405 faces the inside of the cylinder barrel 1. A first O-shaped sealing ring 407 is provided between the front end cover 401 and the cylinder barrel 1; a second O-shaped sealing ring 409 is provided between the rear end cover and the cylinder barrel. A third O-shaped sealing ring 309 is provided between the double-force piston 301 and the piston rod 2, a fourth O-shaped sealing ring 310 is provided between the rotary piston 302 and the piston rod 2, a fifth O-shaped sealing ring 311 is provided between the double-force piston 301 and the inner wall of the cylinder barrel 1, and a sixth O-shaped sealing ring 312 is provided between the rotary piston 302 and the inner wall of the cylinder barrel 1.

[0035] The front end cover 401 is fixed to the front end of the cylinder barrel 1 by a first retaining ring 501, and the rear end cover 403 is fixed to the rear end of the cylinder barrel 1 by a second retaining ring 502. A magnetic ring mounting seat 305 is sleeved on the side of the rotary piston 302 close to the front end cover 401, a magnetic ring 306 is arranged between the magnetic ring mounting seat 305 and the rotary piston 302, and a third pin 307 is arranged through the magnetic ring mounting seat 305, the rotary piston 302 and the piston rod 2, and a first hexagon socket screw 308 and a second hexagon socket screw are respectively arranged at both ends of the third pin 307 to prevent the third pin from falling off.

[0036] A third hexagon socket screw 408 is provided between the rear end cover 403 and the cylinder 1 to prevent relative rotation between the rear end cover 403 and the cylinder 1. A front cover insert 406 is provided between the front end cover 401 and the double force piston 301 to prevent the steel ball 304 from moving toward the front end cover 401. An anti-rotation sleeve 412 is provided between the first pin 410, the second pin 411 and the rear end cover 403 to increase the stability of the first pin 410 and the second pin 411.

[0037] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0038] 1. It can achieve inequality between the clamping force and the holding force, that is, the magnitude of the force during clamping is not equal to the magnitude of the reaction force resisting its loosening, so that the workpiece is not easily crushed or deformed during the clamping process;

[0039] 2. In the preferred solution, under the condition of the same volume, this solution can provide greater clamping force and holding force;

[0040] 3. In the preferred solution, the volume is smaller and the required installation space is correspondingly smaller.

[0041] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the protection scope of the present invention.

Claims

1. A high-capacity rotary clamp, characterized in that: include: Cylinder barrel, end cover, piston rod, piston, fixture; The end cover comprises a front end cover, a middle cover and a rear end cover, the front end cover and the rear end cover are respectively fixed to the front end and the rear end of the cylinder barrel, the front end cover is provided with a through hole, the piston rod passes through the through hole on the front end cover and is connected with the clamp, the piston comprises a double-force piston and a rotary piston, the double-force piston is movably mounted on the piston rod on the side close to the front end cover, the rotary piston is fixedly mounted on the piston rod on the side close to the rear end cover, the double-force piston, the rotary piston, the piston rod and the cylinder barrel are airtightly sealed, a middle cover is provided on the piston rod between the double-force piston and the rotary piston, the middle cover is fixed on the cylinder barrel, a clamping air supply port is provided on the inner wall of the cylinder barrel between the double-force piston and the rotary piston, and a release air supply port is provided on the inner wall of the cylinder barrel between the rotary piston and the rear end cover; The double force piston is provided with a plurality of inclined grooves on one side facing the front end cover, and a steel ball is placed in each inclined groove. The rear end cover is provided with a first pin and a second pin, and the first pin and the second pin are centrally symmetrical with the center of the circle of the rear end cover as the center. The piston rod is provided with two rotation grooves on one side of the rear end cover, and one end of the first pin and the second pin is located in the rear end cover and the other end is located in the rotation groove; A self-lubricating bearing is provided between the front end cover and the piston rod; A U-shaped sealing ring is arranged between the front end cover and the piston rod, and the U-shaped opening direction of the U-shaped sealing ring faces the inside of the cylinder.

2. The high-capacity rotary clamp according to claim 1, characterized in that: A first O-type sealing ring is arranged between the front end cover and the cylinder barrel; a second O-type sealing ring is arranged between the rear end cover and the cylinder barrel.

3. The high-capacity rotary clamp according to claim 2, characterized in that: A third O-ring is arranged between the double-force piston and the piston rod, a fourth O-ring is arranged between the rotary piston and the piston rod, a fifth O-ring is arranged between the double-force piston and the inner wall of the cylinder, and a sixth O-ring is arranged between the rotary piston and the inner wall of the cylinder.

4. The high-capacity rotary clamp according to claim 1, characterized in that: The front end cover is fixed to the front end of the cylinder barrel by a first retaining spring, and the rear end cover is fixed to the rear end of the cylinder barrel by a second retaining spring.

5. The high-capacity rotary clamp according to claim 1, characterized in that: A magnetic ring mounting seat is sleeved on the side of the rotary piston close to the front end cover, a magnetic ring is arranged between the magnetic ring mounting seat and the rotary piston, a third pin is arranged through the magnetic ring mounting seat, the rotary piston and the piston rod, and a first hexagon socket screw and a second hexagon socket screw are respectively arranged at both ends of the third pin to prevent the third pin from falling off.

6. The high-capacity rotary clamp according to claim 1, characterized in that: A third hexagon socket screw is arranged between the rear end cover and the cylinder barrel to prevent relative rotation between the rear end cover and the cylinder barrel.

7. The high-capacity rotary clamp according to claim 1, characterized in that: A front cover insert is arranged between the front end cover and the double force piston to prevent the steel ball from moving toward the front end cover.

8. The high-capacity rotary clamp according to claim 1, characterized in that: An anti-rotation sleeve is arranged between the first pin, the second pin and the rear end cover to increase the stability of the first pin and the second pin.

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