CN119734129A - Clamping device and clamp - Google Patents

Abstract

The present invention discloses a clamping device and a clamp. The clamping device includes a seat body with a working cavity; a clamping member including a driving end and a clamping end connected to each other, the driving end is located in the working cavity, and the clamping end is used to abut and fix the object to be clamped; an adjusting member is installed in the working cavity, and the adjusting member, the driving end and the working cavity cooperate to form a driving cavity, the driving cavity is used to accommodate a working medium, and the working medium is used to push the driving end to move so that the clamping end abuts against the object to be clamped, and when the working medium is discharged from the driving cavity, the driving end can abut against the adjusting member to loosen the object to be clamped; in the working cavity, the adjusting member can be adjusted in position to change the gap between the clamping end and the object to be clamped in the loosened state. The clamp applies the above-mentioned clamping device.

Description

Clamping device and clamp

Technical Field

The invention relates to the technical field of clamps, in particular to a clamping device and a clamp.

Background

The clamp is a high-performance functional component matched with the rolling linear guide rail pair, and is widely applied to mechanical equipment such as a numerical control machine tool, an automatic production line and the like which need high precision and high stability. Because the clamp has strong clamping force, the clamp can effectively prevent vibration in the working process, and can realize precise positioning. For example, in a linear motor driven machine, the clamp can be used for fixing a workbench, preventing vibration and improving machining precision, and in a glass bilateral machine, the clamp can be used for clamping a glass plate, so that stability and safety in the machining process are ensured.

Among these types of clamps are hydraulic clamps or pneumatic clamps. Compared with the pneumatic clamp, the hydraulic clamp has the advantages of stability, strong clamping force, small object movement amount when clamping objects, and the like, but the hydraulic clamp on the market at present has the advantages of complex structure, high part processing difficulty, high cost and higher requirement on installation space, and the hydraulic clamp has too large appearance and cannot be suitable for smaller installation space. And when clamping and positioning the clamp which needs larger clamping force, the clamping force can be improved only by selecting the clamp with larger specification or increasing the number of the clamps, so that the production cost is high. Moreover, when a workpiece is machined, the clamping device needs to be repeatedly positioned, and after the clamping device is clamped and loosened for a plurality of times, the gap between the clamping device and the workpiece is easy to deviate, so that the machining precision of the subsequent workpiece is reduced, and the precision and quality of a product are affected.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides the clamping device and the clamp, wherein the clamp is compact in structure, small in size, capable of being installed and used under the condition of small installation space, simple in structure, low in manufacturing cost and capable of reducing production cost. Meanwhile, the clamp can provide strong holding force, is stable in clamping and high in rigidity, ensures the requirements of processing on the strong holding force and the processing precision, meets the processing requirements of users, and can be suitable for workpieces with various sizes by changing the size of a gap, so that the universality of the clamp is improved.

In a first aspect, a clamping device according to an embodiment of the invention comprises:

the seat body is provided with a working cavity;

The clamping piece comprises a driving end and a clamping end which are connected, the driving end is positioned in the working cavity, and the clamping end is used for abutting and fixing an object to be clamped;

the adjusting piece is arranged in the working cavity, the adjusting piece, the driving end and the working cavity are matched to form a driving cavity, the driving cavity is used for accommodating working media, the working media are used for pushing the driving end to move so that the clamping end abuts against an object to be clamped, and when the working media are discharged from the driving cavity, the driving end can abut against the adjusting piece so as to loosen the object to be clamped;

in the working chamber, the adjusting member is capable of position adjustment to change the gap between the clamping end and the object to be clamped in the unclamped state.

The clamping device provided by the embodiment of the invention has the advantages that the gap between the clamping end of the clamping piece and an object to be clamped is changed by adjusting the position of the piece in the working cavity, so that the clamping device has high flexibility and adaptability, can meet the clamping of guide rails with different sizes, and improves the universality of the clamp. The working principle is that after the working medium continuously enters and fills the driving cavity, the working medium pushes the driving end of the clamping piece to move, so that the clamping end moves towards the object to be clamped, and the gap between the clamping end and the object to be clamped is gradually reduced until the clamping piece clamps and fixes the object to be clamped. When the object is machined, the working medium is discharged, at the moment, the driving end is reset and drives the clamping end to be far away from the object, after the clamping end is separated from the object, the object can be in a loosening state, and the driving end is continuously close to the adjusting piece and finally abuts against the adjusting piece. And the gap between the clamping end of the clamping piece and the object to be clamped can be adjusted by adjusting the positions of the adjusting piece and the working cavity, so that the fixing of workpieces with different sizes is met, and the universality of the clamp is improved. It can be understood that, if the size of the object to be clamped is larger than the distance between the two clamping ends, the user can increase the distance between the two clamping ends by adjusting the position of the piece in the working cavity so as to meet the requirement of clamping and fixing the object with the current size. That is, when the size of the object to be clamped changes, the clamping device can be easily adjusted to adapt to objects of different sizes by adjusting the position of the adjusting piece, so that the universality and flexibility of the clamping device are improved, the whole clamping device or the clamping piece does not need to be replaced, the position of the adjusting piece is only required to be adjusted to adapt to objects of different sizes, the gap is adjusted to adapt to objects of different sizes, and the need of frequently replacing the clamping device or the clamping piece is avoided, so that the production cost and the maintenance cost are reduced. And the size of the gap between the clamping end and the object to be clamped can be accurately controlled, which is particularly important for application scenes needing to strictly control the clamping force or the gap, such as precision manufacturing, automatic assembly and the like. In addition, proper gaps can ensure that the clamping ends can be uniformly distributed when clamping force is applied, and damage to objects or poor clamping effect caused by overlarge local stress is avoided. By adjusting the gap, the clamping effect can be optimized, and the stability and reliability of clamping can be improved. In some cases, too tight a clamping may result in damage to the surface of the object to be clamped. By adjusting the gap, the pressure of the clamping end on the object can be reduced, so that the surface of the object is protected from being damaged.

It should be noted that the working medium may be a hydraulic oil medium, and the present application is not particularly limited to the type of the working medium, and the user may select the working medium according to the actual situation.

According to the clamp device disclosed by the embodiment of the invention, the adjusting piece comprises the outer ring groove, the outer ring groove is positioned at one side of the adjusting piece close to the driving end, the outer ring groove is opened towards the driving end, and the outer ring groove is used for forming the driving cavity;

And/or the adjusting piece comprises a boss, the boss is positioned on one side of the adjusting piece close to the driving end, the adjusting piece is abutted to the driving end through the top of the boss, and gaps around the boss are used for forming a driving cavity.

According to the clamp provided by the embodiment of the invention, the adjusting piece is provided with the first groove, the first groove is positioned on one side of the adjusting piece close to the driving end, the first groove is used for forming the driving cavity, the adjusting piece is provided with the gas-liquid pressurizing device, the gas-liquid pressurizing device is provided with the communication hole communicated with the driving cavity, and the communication hole is positioned at the bottom of the first groove.

According to the clamp disclosed by the embodiment of the invention, the adjusting piece and/or the driving end are/is provided with the positioning ring groove, the positioning ring groove is sleeved with the sealing ring and the sealing ring, and the sealing ring are used for being abutted against the cavity wall of the working cavity to seal.

According to the clamp device disclosed by the embodiment of the invention, the working cavity is provided with the elastic piece, the elastic piece is positioned on one side of the driving end far away from the adjusting piece, and the elastic piece is used for driving the driving end to be close to and abut against the adjusting piece.

According to the clamp device provided by the embodiment of the invention, the working medium is hydraulic oil, the adjusting piece is provided with an oil supply circuit for supplying the hydraulic oil, and the oil supply circuit is connected with the gas-liquid supercharging device.

According to the clamp provided by the embodiment of the invention, the number of the clamping pieces and the adjusting pieces is a plurality of pairs, and one pair of clamping pieces clamps an object to be clamped.

According to the clamp disclosed by the embodiment of the invention, the base body is provided with the clamping cavity, and the side wall of the clamping cavity is provided with the clamping piece.

According to the clamp device provided by the embodiment of the invention, the working medium is hydraulic oil, the base body is provided with an oil supply circuit for supplying the hydraulic oil, and the oil supply circuit is connected with the gas-liquid supercharging device.

In a second aspect, a clamp according to an embodiment of the present invention employs the clamping device described above.

The clamp provided by the embodiment of the invention has the advantages that the gap between the clamping end of the clamping piece and an object to be clamped is changed by adjusting the position of the piece in the working cavity, so that the clamp has high flexibility and adaptability, can meet the clamping of guide rails with different sizes, and improves the universality of the clamp. The working principle is that after the working medium continuously enters and fills the driving cavity, the working medium pushes the driving end of the clamping piece to move, so that the clamping end moves towards the object to be clamped, and the gap between the clamping end and the object to be clamped is gradually reduced until the clamping piece clamps and fixes the object to be clamped. When the object is machined, the working medium is discharged, at the moment, the driving end is reset and drives the clamping end to be far away from the object, after the clamping end is separated from the object, the object can be in a loosening state, and the driving end is continuously close to the adjusting piece and finally abuts against the adjusting piece. And the gap between the clamping end of the clamping piece and the object to be clamped can be adjusted by adjusting the positions of the adjusting piece and the working cavity, so that the fixing of workpieces with different sizes is met, and the universality of the clamp is improved. It can be understood that, if the size of the object to be clamped is larger than the distance between the two clamping ends, the user can increase the distance between the two clamping ends by adjusting the position of the piece in the working cavity so as to meet the requirement of clamping and fixing the object with the current size. That is, when the size of the object to be clamped changes, the clamping device can be easily adjusted to adapt to objects of different sizes by adjusting the position of the adjusting piece, so that the universality and flexibility of the clamping device are improved, the whole clamping device or the clamping piece does not need to be replaced, the position of the adjusting piece is only required to be adjusted to adapt to objects of different sizes, the gap is adjusted to adapt to objects of different sizes, and the need of frequently replacing the clamping device or the clamping piece is avoided, so that the production cost and the maintenance cost are reduced. And the size of the gap between the clamping end and the object to be clamped can be accurately controlled, which is particularly important for application scenes needing to strictly control the clamping force or the gap, such as precision manufacturing, automatic assembly and the like. In addition, proper gaps can ensure that the clamping ends can be uniformly distributed when clamping force is applied, and damage to objects or poor clamping effect caused by overlarge local stress is avoided. By adjusting the gap, the clamping effect can be optimized, and the stability and reliability of clamping can be improved. In some cases, too tight a clamping may result in damage to the surface of the object to be clamped. By adjusting the gap, the pressure of the clamping end on the object can be reduced, so that the surface of the object is protected from being damaged.

It should be noted that the working medium may be a hydraulic oil medium, and the present application is not particularly limited to the type of the working medium, and the user may select the working medium according to the actual situation.

The clamp device has the advantages of compact structure, small volume, simple structure, low manufacturing cost and low production cost, and can be installed and used under the condition of smaller installation space. Meanwhile, the clamp can provide strong holding force, is stable in clamping and high in rigidity, ensures the requirement of processing on the strong holding force, and meets the processing requirement of a user.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a cross-sectional view of a clamping device according to an embodiment of the present invention;

fig. 2 is an enlarged view of a mark a in fig. 1;

FIG. 3 is an exploded view of a clamping device according to an embodiment of the present invention;

FIG. 4 is a block diagram of an adjustment member and a clamping member according to an embodiment of the present invention;

FIG. 5 is a perspective view of a clamping device according to an embodiment of the present invention;

FIG. 6 is an isometric view of a clamping device according to an embodiment of the invention;

fig. 7 is an exploded view of an embodiment of the piston rod of the present invention disposed on an oil supply circuit;

Fig. 8 is a structural view of an embodiment of the present invention in which a plurality of clamping members are provided.

Reference numerals illustrate:

A workpiece 1;

The hydraulic device comprises a seat body 100, a working cavity 110, a driving cavity 120, an oil supply circuit 130 and a clamping cavity 140;

Clamping member 200, driving end 210, clamping end 220;

The adjusting member 300, the outer ring groove 310, the boss 320, the first groove 330, the communication hole 340;

Positioning ring groove 400, sealing ring 410, sealing ring 420;

a piston rod 500.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the invention, the meaning of a number is one or more, the meaning of a plurality is two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and the above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 6, an embodiment of the present invention provides a clamping device.

Specifically, as shown in the figure, the clamping device comprises a base body 100 with a working cavity 110, a clamping piece 200, an adjusting piece 300 and a driving piece 120, wherein the clamping piece 200 comprises a driving end 210 and a clamping end 220 which are connected, the driving end 210 is positioned in the working cavity 110, the clamping end 220 is used for abutting and fixing an object to be clamped, the adjusting piece 300 is installed in the working cavity 110, the adjusting piece 300, the driving end 210 and the working cavity 110 are matched to form a driving cavity 120, the driving cavity 120 is used for containing a working medium, the working medium is used for pushing the driving end 210 to move so that the clamping end 220 abuts against the object to be clamped, when the working medium is discharged from the driving cavity 120, the driving end 210 can abut against the adjusting piece 300 to loosen the object to be clamped, and in the working cavity 110, the position of the adjusting piece 300 can be adjusted so as to change a gap between the clamping end 220 and the object to be clamped in a loosening state.

The base 100 has a clamping cavity 140, and a clamping member 200 is disposed on a sidewall of the clamping cavity 140.

The gap between the clamping end 220 of the clamping member 200 and the object to be clamped is changed by the position of the adjusting member 300 in the working chamber 110, so that the clamping device has high flexibility and adaptability, can meet the clamping of guide rails with different sizes, and improves the universality of the clamping device. The specific working principle is that after the working medium continuously enters and fills the driving cavity 120, the working medium pushes the driving end 210 of the clamping piece 200 to move, so that the clamping end 220 moves towards the object to be clamped, and the gap between the clamping end 220 and the object to be clamped is gradually reduced until the clamping piece 200 clamps and fixes the object to be clamped. When the object is processed, the working medium is discharged, at this time, the driving end 210 resets and drives the clamping end 220 to be far away from the object, and when the clamping end 220 is separated from the object, the object can be in a loose state, and the driving end 210 is continuously close to the adjusting member 300 and finally abuts against the adjusting member 300. And the positions of the adjusting member 300 and the working chamber 110 can be adjusted to adjust the gap between the clamping end 220 of the clamping member 200 and the object to be clamped, so as to meet the fixing of workpieces 1 with different sizes, and improve the universality of the clamp. It will be appreciated that, if the size of the object to be clamped is larger than the distance between the two clamping ends, the user can increase the distance between the two clamping ends by adjusting the position of the member 300 in the working chamber 110, so as to satisfy the clamping and fixing of the object of the current size. That is, when the size of the object to be clamped is changed, the clamping device can be easily adjusted to accommodate objects of different sizes by adjusting the position of the adjusting member 300, so that the universality and flexibility of the clamping device are improved, the whole clamping device or the clamping member 200 is not required to be replaced, the objects of different sizes can be accommodated only by adjusting the position of the adjusting member 300, the objects of different sizes are accommodated by adjusting the gap, and the need of frequently replacing the clamping device or the clamping member 200 is avoided, thereby reducing the production cost and the maintenance cost. And the gap between the clamping end 220 and the object to be clamped can be precisely controlled, which is particularly important for application situations requiring strict control of clamping force or gap, such as precision manufacturing, automatic assembly, etc. In addition, proper clearances can ensure that the clamping ends 220 are evenly distributed when clamping force is applied, and damage to objects or poor clamping effects caused by excessive local stress can be avoided. By adjusting the gap, the clamping effect can be optimized, and the stability and reliability of clamping can be improved. In some cases, too tight a clamping may result in damage to the surface of the object to be clamped. By adjusting the gap, the pressure of the clamping end 220 against the object can be reduced, thereby protecting the surface of the object from damage.

According to some embodiments of the application, as shown, the application provides a first embodiment with respect to the adjuster 300. Specifically, the adjusting member 300 includes an outer ring groove 310, the outer ring groove 310 is located on a side of the adjusting member 300 near the driving end 210, the outer ring groove 310 is open toward the driving end 210, and the outer ring groove 310 is used to form the driving cavity 120.

Or, the adjusting member 300 includes a boss 320, the boss 320 is located on a side of the adjusting member 300 close to the driving end 210, the adjusting member 300 abuts against the driving end 210 through the top of the boss 320, and the boss 320 cooperates with the inner wall of the working chamber 110 to form the driving chamber 120 together.

According to some embodiments of the application, as shown, the application provides a second embodiment with respect to the adjuster 300. Specifically, the adjusting member 300 has a first groove 330, the first groove 330 is located on a side of the adjusting member 300 close to the driving end 210, the first groove 330 is used for forming the driving cavity 120, further, a communication hole 340 is disposed at a bottom of the first groove 330, the communication hole 340 is communicated with the working cavity 110, the communication hole 340 can be used as an oil supply path 130, and hydraulic oil can be input into the working cavity 110 through the communication hole 340 to push the clamping member 200 to move.

According to some embodiments of the present application, the base 100 has an oil supply passage 130 for supplying hydraulic oil, and the regulator 300 has a gas-liquid pressurizing device. Specifically, as shown in fig. 1, the adjuster 300 is provided with a communication hole 340, the adjuster 300 is provided with a piston rod 500, and one end of the piston rod 500 is connected to the communication hole 340. The specific working principle is that a user inputs a certain amount of hydraulic oil into the driving cavity 120 in advance, when the piston rod 500 starts to move, the hydraulic oil in the driving cavity 120 is extruded, because the space of the driving cavity 120 is smaller, the piston rod pushes the hydraulic oil in the driving cavity 120, the hydraulic oil in the driving cavity 120 is extruded, the area ratio of two pistons (namely, the piston rod 500 and the clamping piece 200 are equivalent to the area ratio of the application) generates pressure ratio (supercharging ratio), the pressure ratio is equal to gas driving pressure=output pressure), the function of gas-liquid conversion and the improvement of the hydraulic pressure is achieved, the high-pressure hydraulic oil pushes the clamping piece 200 to displace so as to clamp the workpiece 1, when the gas pressure direction is switched, the piston rod 500 is retracted, the hydraulic pressure is reduced, and the clamping piece 200 is reset under the rebound action of an elastic piece so as to release the clamping of the workpiece 1.

Or, the housing 100 has an oil supply passage 130 for supplying hydraulic oil. Optionally, when the gas-liquid supercharging device is arranged on the oil supply circuit 130, the pneumatic hydraulic pump is arranged outside the clamping device to provide high-pressure hydraulic oil for the clamping device, so that higher output pressure is provided for the clamping device, the clamping force of the clamping device is improved, the requirement of large clamping force is met, the stable clamping of objects is ensured, and the processing precision of the objects is ensured.

Or, the housing 100 has an oil supply passage 130 for supplying hydraulic oil. Alternatively, as shown in fig. 7, a piston rod 500 may be provided on the oil supply passage 130. Specifically, the user inputs a predetermined amount of hydraulic oil in advance, and sets the piston rod 500 in the oil supply passage 130. When the piston rod 500 and the oil supply channel 130 are moved, the piston rod 500 pushes hydraulic oil, the hydraulic oil is extruded, the area ratio of the two pistons (namely, the piston rod and the clamping piece 200 of the application) generates pressure ratio (supercharging ratio), (pressure ratio: gas driving pressure = output pressure), the function of gas-liquid conversion and increasing hydraulic pressure is achieved, the clamping piece 200 is pushed by high-pressure hydraulic oil to displace so as to clamp the workpiece 1, when the pneumatic pressure direction is switched, the piston rod is retracted, the hydraulic pressure is reduced, and the clamping piece 200 resets the clamping piece 200 under the rebound action of the elastic piece so as to release the clamping of the workpiece 1. It should be noted that, when the seat body 100 is provided with the oil supply passage 130, the adjusting member 300 is not provided with the communication hole 340, or the communication hole 340 of the adjusting member is plugged by a plug.

It can be understood that the high-pressure hydraulic oil can be provided for the clamping device by utilizing gas-liquid conversion, so that higher output pressure is provided for the clamping device, the clamping force of the clamping device is improved, the requirement of large clamping force is met, the stable clamping of an object is ensured, and the processing precision of the object is ensured.

According to some embodiments of the present application, the adjusting member 300 and/or the driving end 210 is provided with a positioning ring groove 400, the positioning ring groove 400 is sleeved with a sealing ring 410 and a sealing ring 420, and the sealing ring 410 and the sealing ring 420 are used for abutting against the cavity wall of the working cavity 110 to seal the working medium, so that the condition that the working medium leaks or leaks when the object is clamped repeatedly or is clamped for a long time is avoided, the stability of the clamping force of the clamp is affected, and the processing precision of the object is prevented from being affected.

According to some embodiments of the present application, the working chamber 110 is provided with an elastic member, and the elastic member is located at a side of the driving end 210 away from the adjusting member 300, and the elastic member is used to drive the driving end 210 to approach and abut against the adjusting member 300.

It can be understood that when the working medium is discharged from the driving chamber 120, due to the pressure drop in the driving chamber 120, the elastic member pushes the clamping member 200 to reset under the elastic restoring action of the elastic member, so that the driving end 210 gradually approaches the adjusting member 300, and finally the driving end 210 abuts against the adjusting member 300, and when the driving end 210 abuts against the adjusting member 300 completely, the clamping member 200 stops moving, and at this time, the clamping end 220 is released from the object, and the object can be taken out.

The present application is not particularly limited to the type of the elastic member, and the elastic member may be a member having a deformation recovery capability such as a spring.

According to some embodiments of the present application, the number of the clamping members 200 and the adjusting members 300 is several pairs, and one pair of the clamping members 200 clamps an object to be clamped.

It will be appreciated that the clamping member 200 and the adjustment member 300 can be adjusted in number depending on the actual length of the object. As shown in the figure, the clamping members 200 are separately arranged on two sides of the object, and the two clamping members 200 are combined in a pair to jointly realize clamping and fixing on the object. As shown in fig. 8, when a user has a certain requirement on the clamping force of an object, the number of pairs of the clamping members 200 can be increased to improve the clamping force of the object, ensure the clamping stability of the object, ensure the processing precision and meet the requirement of the user.

It should be noted that the working medium may be a hydraulic oil medium, and the present application is not particularly limited to the type of the working medium, and the user may select the working medium according to the actual situation. Preferably, the working medium is hydraulic oil.

The application also provides a clamp applying the clamping device.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims (10)

1. Clamping device, characterized in that it comprises:

the seat body is provided with a working cavity;

the clamping piece comprises a driving end and a clamping end which are connected, the driving end is positioned in the working cavity, and the clamping end is used for abutting and fixing an object to be clamped;

The adjusting piece is arranged in the working cavity, the adjusting piece, the driving end and the working cavity are matched to form a driving cavity, the driving cavity is used for accommodating working media, the working media are used for pushing the driving end to move so that the clamping end abuts against the object to be clamped, and when the working media are discharged from the driving cavity, the driving end can abut against the adjusting piece so as to loosen the object to be clamped;

In the working chamber, the adjusting member is capable of performing a position adjustment to change a gap between the clamping end and the object to be clamped in the unclamped state.

2. The clamping device as recited in claim 1, wherein said adjustment member includes an outer annular groove on a side of said adjustment member adjacent said drive end, said outer annular groove being open to said drive end, said outer annular groove being adapted to form said drive cavity;

and/or the adjusting piece comprises a boss, the boss is positioned on one side of the adjusting piece, which is close to the driving end, the adjusting piece is abutted to the driving end through the top of the boss, and gaps around the boss are used for forming the driving cavity.

3. The clamping device as claimed in claim 1, characterized in that the adjusting member has a first recess which is located on a side of the adjusting member adjacent to the driving end, the first recess being used for forming the driving chamber, the adjusting member has a gas-liquid pressurizing device which has a communication hole which communicates with the driving chamber, the communication hole being located at a bottom of the first recess.

4. A clamping device according to claim 1, wherein the adjustment member and/or the drive end is provided with a retaining ring groove, the retaining ring groove being sleeved with a sealing ring and a sealing ring for abutting against the cavity wall of the working cavity for sealing.

5. The clamping device as claimed in claim 1, wherein the working chamber is provided with an elastic member, the elastic member is located at a side of the driving end away from the adjusting member, and the elastic member is used for driving the driving end to approach and abut against the adjusting member.

6. The clamping device as claimed in claim 1, characterized in that the working medium is hydraulic oil, the adjusting member having an oil supply passage for supplying the hydraulic oil, the oil supply passage being connected to a gas-liquid pressurizing device.

7. The clamping device as claimed in claim 1, wherein the number of clamping members and the adjustment members is a number of pairs, a pair of the clamping members clamping the object to be clamped.

8. The clamping device as recited in claim 7, characterised in that said housing has a clamping cavity, a side wall of said clamping cavity being provided with said clamping member.

9. The clamping device as claimed in claim 1, wherein the working medium is hydraulic oil, the housing has an oil supply passage for supplying the hydraulic oil, and the oil supply passage is connected to a gas-liquid pressurizing device.

10. A clamp comprising a gripping device according to any one of claims 1 to 9.