CN111230529A

CN111230529A - Balance clamp

Info

Publication number: CN111230529A
Application number: CN202010193321.3A
Authority: CN
Inventors: 王成
Original assignee: Suzhou Bridge Electronic Co ltd
Current assignee: Suzhou Bridge Electronic Co ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-06-05

Abstract

The balance clamp disclosed by the invention comprises a hydraulic balance part, and the balance clamp comprises: the cylinder body is provided with a working cavity and a liquid storage cavity which are communicated with each other, and the working cavity is provided with an upper cavity opening on the cylinder body; a piston cooperatively disposed within the working chamber; a clamp carrier connected to the piston through the upper cavity opening. The balance clamp effectively improves the machining production efficiency through the hydraulic balance structure arranged on the balance clamp, does not need to additionally arrange hydraulic equipment for realizing the hydraulic balance of the clamp, and simplifies the equipment.

Description

Balance clamp

Technical Field

The invention belongs to the technical field of machining clamps, and particularly relates to a hydraulic self-balancing balance clamp.

Background

A device for fixing the object to be processed to a correct position for receiving construction or inspection in the machine manufacturing process, which is also called a fixture (qi a/j ǜ). In a broad sense, any device used to quickly, conveniently and safely mount a workpiece at any stage in a process may be referred to as a jig. Such as welding jigs, inspection jigs, assembly jigs, machine tool jigs, and the like. Among them, the machine tool clamp is the most common, and is often referred to as a clamp for short. When a workpiece is machined on a machine tool, the workpiece needs to be assembled (positioned) and firmly clamped (clamped) before machining in order to enable the surface of the workpiece to meet the technical requirements of the size, the geometric shape, the mutual position precision with other surfaces and the like specified in the drawing.

When the clamps are used for machining large parts, in order to avoid deformation of the parts caused by uneven stress, a hydraulic device is generally adopted to provide balance support for the parts. In order to achieve this, in the prior art, a hydraulic pump is additionally disposed on the fixture to obtain the hydraulic support, which requires an additional set of hydraulic system to be connected outside the processing equipment, not only increasing the structure and scale of the whole system, but also increasing the cost greatly because an additional set of hydraulic equipment needs to be provided. In addition, because the hydraulic equipment is additionally arranged, maintenance is required once the hydraulic equipment fails, the cost of production and processing is increased virtually, and the efficiency is affected.

Disclosure of Invention

According to the balance clamp disclosed by the invention, the clamp can realize self hydraulic balance through the matching of the arranged working cavity and the hydraulic cavity, so that the structure is simplified, the efficiency of production processing and equipment maintenance can be effectively improved through direct maintenance and replacement, the aim of reducing the cost is fulfilled, the maintenance is facilitated, and the large-scale expansion of the clamp is facilitated.

The balance clamp disclosed by the invention comprises a hydraulic balance part, and the balance clamp comprises:

the cylinder body is provided with a working cavity and a liquid storage cavity which are communicated with each other, and the working cavity is provided with an upper cavity opening on the cylinder body;

a piston cooperatively disposed within the working chamber;

a clamp carrier connected to the piston through the upper cavity opening. (the portion for directly holding or clamping the workpiece is connected to the piston through the clamp carrier, which allows a portion of the clamp carrier to be exposed through the upper chamber opening). Furthermore, the upper part of the cylinder body is also provided with a top seal corresponding to the upper opening of the cavity, the top seal is provided with a top seal which is matched with the upper opening of the cavity, so that at least the carrying platform of the clamp carrier can be exposed from the top seal to be convenient for clamping or supporting the workpiece, and the top seal is used for limiting the clamp carrier.

Further, the relevant cylinders are defined as: the working chamber is communicated with the cylinder body and is provided with openings on a pair of opposite surfaces, namely an upper chamber opening and a lower chamber opening, the liquid storage chamber is provided with an opening on one surface of the pair of opposite surfaces and can be positioned at the same side with the upper chamber opening, and the working chamber is communicated with the bottom of the liquid storage chamber.

Preferably, the working chamber and the liquid storage chamber are arranged adjacently and have the same sinking direction towards the cylinder body. Preferably, the side walls of the reservoir chamber adjacent the working chamber are at least partially parallel to the corresponding side walls of the working chamber.

Preferably, a pressure chamber is further formed on the cylinder body, an opening at one end of the pressure chamber is located on the side wall of the cylinder body, the other end of the pressure chamber extends into the cylinder body, and the working chamber and the liquid storage chamber are both communicated to the pressure chamber.

Preferably, the pressure chamber is formed below the reservoir chamber.

Preferably, still be formed with on the cylinder body and be taken over I and take over II outward, take over I outward with take over II adjacent settings in the pressure chamber and lie in one side of keeping away from the working chamber on the cylinder body, take over I outward and take over II outward and all communicate with the pressure chamber.

Preferably, the outer connecting pipe I and the outer connecting pipe II respectively intersect with the pressure cavity to form a transition section II and a transition section III.

Preferably, the transition section III is formed at the lower part of the liquid storage cavity and is communicated with the bottom of the liquid storage cavity.

Preferably, the bottom of the liquid storage cavity is also provided with a sinking part, and the sinking part is sunk from the bottom of the liquid storage cavity to the pressure cavity and is communicated with the transition section III.

Preferably, the bottom of the sinking portion is further provided with a transition pipe, and the transition pipe is communicated between the transition section III and the sinking portion.

Preferably, the working cavity is also communicated with a transition section I, and the transition section I is communicated with a transition section II.

The invention discloses an improvement of a balance clamp, wherein a clamp carrier comprises a carrier and a convex body, the carrier comprises a working surface for supporting a workpiece (the working surface can directly support the workpiece to the carrier, or indirectly limit the work through other or connecting pieces), the working surface can be a plane platform structure, or a limiting structure designed for matching the shape of the workpiece, such as a groove or a step arranged for matching a convex part on the workpiece, or a clamping structure provided for clamping and provided with a clamping arm, such as clamping the workpiece between the clamping arms through the clamping arms which can adjust the position, and the convex body is connected to the carrier in a way of deviating from the working surface (the deviating working surface is used for reducing the occupation of the convex body on the working surface, so as to obtain larger bearing space as much as possible) and protrudes to the outer side of the carrier;

the piston also comprises a mounting hole, and the convex body is arranged in the mounting hole in a matching way.

The invention discloses an improvement of a balance clamp, wherein a carrier and a convex body are of a column structure, the maximum diameter of the carrier is larger than that of the convex body, the top surface of the carrier is a working surface, and the bottom surface of the carrier is connected with the convex body.

The invention discloses an improvement of a balance clamp, wherein a mounting hole of a piston penetrates through the piston along the symmetry axis of the piston.

The invention discloses an improvement of a balance clamp, wherein a limiting body is further formed on the other side of a convex body far away from a carrying platform.

The invention discloses an improvement of a balance clamp, wherein the hydraulic balance part also comprises a spring which is arranged in the working cavity, at least one end of the spring is sleeved outside the limiting body and forms elastic support for a clamp carrier.

The invention discloses an improvement of a balance clamp, wherein a working cavity penetrates through a cylinder body and forms an upper cavity opening and a lower cavity opening on one pair of surfaces of the cylinder body respectively.

The invention discloses an improvement of a balance clamp, wherein the hydraulic balance part also comprises a back cover, and the back cover is hermetically connected with a lower opening of the cavity. Further, its border of back cover still is provided with seal groove II, seal groove II still is provided with sealing member II matchingly, sets up sealing member II in seal groove II through this cooperation to realized under the non-dismantlement state, also under the effective confined state of back cover to the cavity under shed, realized the inseparable cooperation between the back cover and the cavity under shed both, in order to prevent to appear leaking under non-operating condition or operating condition.

The invention discloses an improvement of a balance clamp, wherein the other end of a spring is supported to a back cover and forms elastic support for a clamp carrier.

The invention discloses an improvement of a balance clamp, in order to realize that a clamp carrier is driven by the pressure of a piston, namely the piston moves in a working cavity under the action of hydraulic pressure, a power device of a power source such as a cylinder or a motor can be arranged, the power device can be used for adjusting the pressure of a hydraulic medium in a cylinder body, namely the movement of the piston in the working cavity is adjusted through the adjustment of the pressure, and therefore the clamp carrier is driven to support or clamp a workpiece. The power device is provided with a pressure shaft which is used for being matched with the pressure cavity, is arranged in the pressure cavity and is tightly matched with the inner wall of the pressure cavity, and the support of the clamp carrier is realized by moving the pressure shaft in the pressure cavity along the extension direction of the pressure shaft, namely adjusting the depth of the pressure shaft in the pressure cavity, namely adjusting the pressing degree of the hydraulic medium in the pressure cavity. Furthermore, for driving the pressure shaft, it can be connected to a cylinder, where a reciprocating linear cylinder can be directly selected, by means of which a reciprocating piston is connected to the driving pressure shaft, and by means of which the movement of the reciprocating piston brings about the movement of the pressure shaft in the pressure chamber. Of course, the drive here can also be realized by a linear stroke screw rod driven by a motor, that is, by two engaged screws driven by the motor and engaged in parallel, wherein one screw rod is driven by a rotating shaft of the motor to rotate at a limited position, and the other screw rod is driven by the engaged screw threads to move in the extending direction of the rotating shaft of the other screw rod, so that the rotation of the motor is converted into the linear motion. Furthermore, in order to improve the sealing matching between the pressure shaft and the pressure cavity, a pressure sealing ring is further arranged on the pressure shaft. Further, a pressure sealing ring is arranged at the sealing position of the pressure shaft, and the sealing can be an annular groove sunken into the pressure shaft. Further, in order to define the pressure shaft for better fit with the pressure chamber, a pressure shaft seat may be provided, which has a pressure shaft hole for fit with the pressure shaft, and the pressure shaft is defined to the cylinder body by the pressure shaft seat for defining and connecting the pressure shaft.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural view of one embodiment of a balancing fixture of the present invention;

FIG. 2 is a perspective view of one embodiment of a cylinder of the balancing fixture of the present invention;

FIG. 3 is a schematic perspective view of the embodiment of FIG. 2 in yet another orientation;

FIG. 4 is a schematic diagram of the internal horizontal internal piping of the embodiment of FIG. 2;

FIG. 5 is a schematic diagram of the structure of the internal pipe connecting the liquid outlet cavity in the vertical direction in the embodiment of FIG. 2;

FIG. 6 is a schematic diagram of an embodiment of a hydraulic balance portion of the balance clamp of the present invention;

fig. 7 is a schematic structural view of an embodiment of a power unit of the balancing jig of the present invention.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. The embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.

As shown in fig. 1, the balance clamp of the present invention forms a simple hydraulic balance integral structure by itself, that is, it can be directly formed by a hydraulic balance part 100 and a power device 200 as shown in the figure, where most importantly, a working chamber similar to a hydraulic cylinder and a fluid storage chamber similar to a fluid tank are formed in a cylinder body of the hydraulic balance part, so that the medium pressure inside the cylinder body of the clamp, such as the pressure of hydraulic oil, is adjusted by a power source, such as a cylinder, and further, when machining, the stress of a workpiece clamped or placed on a carrier 117 is buffered.

As shown in fig. 2 to 5, as an embodiment of the hydraulic balancing unit:

the cylinder body 101 is formed with a working chamber 105 and a reservoir chamber 106, wherein the working chamber 105 is mainly used for realizing the hydraulic support of the workpiece, and is mainly supported by a piston 112 arranged therein, and the reservoir chamber 106 is mainly used for realizing the storage of a hydraulic medium, and through the communication and matching of the working chamber 105 and the reservoir chamber 106 on the cylinder body 101, the hydraulic pressure balance between the working chamber 105 and the reservoir chamber 106 is realized, thereby satisfying the requirement of self-balancing. The working chamber 105 penetrates the cylinder 101 and has an opening on a pair of opposite sides, the reservoir chamber 106 has an opening on one of the pair of opposite sides, the opening is normally in a sealed and closed state, the working chamber 105 is communicated with the bottom of the reservoir chamber 106 at the moment, an effective balanced and buffered state can be obtained, the opening of the working chamber 105 on the same side is used for arranging a clamp part supported by a hydraulic piston 112, the clamp part is used for supporting and clamping a workpiece, in the working state, the piston 112 generates hydraulic buffering in the working chamber 105, and the other opening of the working chamber 105 is closed in a normal state, and the opening is mainly convenient for processing, overhauling, installation and the like. At this time, it may be further provided that the working chamber 105 is disposed adjacent to the reservoir chamber 106 and both recess directions into the cylinder 101 are the same, as in the case shown in fig. 1, which allows for a high convenience in workability of the cylinder 101 of the cylinder and in connection and control between the working chamber 105 and the reservoir chamber 106. Preferably, the side wall of the reservoir chamber 106 adjacent to the working chamber 105 is at least partially parallel to the corresponding side wall of the working chamber 105, which allows the reservoir chamber 106 to have more working medium storage capacity to meet the buffering requirement during operation. The upper part of the cylinder body is also provided with a top seal 111 corresponding to the upper opening of the cavity, the top seal 111 is provided with a top seal which is matched with the upper opening of the cavity, so that at least a carrying platform of the clamp carrier can be exposed by the top seal to be convenient for clamping or supporting a workpiece, and the top seal is used for limiting the clamp carrier

For carrying the workpiece to be machined, a gripper carrier is also provided on the piston 112, which is connected to the piston 112 via an upper chamber opening. In order to improve the sealing between the piston 112 and the working chamber, a seal ring i 113 may be provided on the piston 112, but in order to limit the seal ring i 113 to the piston 112 well, a mounting groove may be provided in the body of the piston 112 around the circumference, and the seal ring i 113 may be provided in the mounting groove. In the figure, three groups of sealing rings I113 and matched mounting grooves can be correspondingly arranged, and other number combinations can be also arranged. With the sealing ring engaged, the maximum outer diameter of the piston 112 may be slightly smaller than the inner diameter of the working chamber. The clamp carrier comprises a carrier 117 and a convex body 110, the carrier 117 has a working surface for supporting the workpiece (the support of the working surface to the workpiece can be a flat platform structure for directly placing the workpiece on the carrier, i.e. can be in a platform form as shown in fig. 6, can be indirectly limited by other or connecting components, the working surface can be a flat platform structure, can be a limiting structure designed for matching the shape of the workpiece, such as a groove or a step for matching the convex part on the workpiece, and the like, and the support of the corresponding part through the groove or the step and the like can play a role of limiting and supporting the workpiece, and can be a clamping structure with a clamping arm for clamping, such as clamping the workpiece between the clamping arms through which the position can be adjusted, and the convex body 110 is deviated from the working surface (the deviation of the working surface is used for reducing the occupation of the working surface by the convex body 110, so as to obtain a larger carrying space as much as possible) is connected to the stage 117 and protrudes outside the stage 117. As shown in fig. 6, the convex body 110 protrudes from the other side of the working surface of the carrier 117, which is a structure close to a T-shaped table, and meets the requirement of the present embodiment. In order to meet the requirement of the fitting between the clamp carrier and the piston 112, the piston 112 may further be provided with a mounting hole penetrating through the piston 112, so as to fittingly dispose the convex body 110 in the mounting hole, and at this time, the convex body 110 and the piston 112 may be coaxially disposed, and the tight sealing fit between the convex body 110 and the mounting hole may be met, thereby effectively meeting the hydraulic requirement. As shown in the figure, the carrier 117 and the convex body 110 may be both of a column structure, especially a cylindrical structure coaxially arranged, and in order to obtain the carrying capacity, the maximum diameter of the carrier 117 is larger than that of the convex body 110, the top surface of the carrier 117 is a working surface, and the bottom surface of the carrier 117 is connected with the convex body 110.

Of course, the hydraulic balance portion may further include a spring 116 to enable the clamp carrier to obtain elastic recovery and return capability, the spring 116 is disposed in the working cavity, and at least one end of the spring is sleeved outside the limiting body and elastically supports the clamp carrier, at this time, when the clamp carrier is in use, that is, after the carrier 117 in the figure bears a workpiece, the piston 112 is hydraulically supported and also elastically supported by the spring 116, and after the machined workpiece is removed, the spring 116 further pushes the piston 112 to return, that is, the clamp carrier returns. Certainly, in order to provide better matching performance between the clamp carrier and the spring 116, a limiting body is further formed on the other side of the convex body 110 away from the carrier 117, and is used for limiting to one end of the spring 116, so that the connection of the spring 116 can be fixed, and the convex limiting body can also play a role in limiting and guiding the stress, so as to avoid the influence on the service life of the working chamber caused by the cheap stress in the allowing process, wherein the spring 116 is sleeved on the limiting body in the figure.

In order to obtain good processing and maintenance performance, the working chamber may penetrate through the cylinder body and form an upper chamber opening and a lower chamber opening on one side of the cylinder body, wherein the lower chamber opening is generally closed by a back cover, and the back cover and the lower chamber opening are in sealed connection. Further, its border of back cover still is provided with seal groove II, and seal groove II still is provided with sealing member II 115 with matcing, sets up sealing member II 115 in seal groove II through this cooperation to realized under the non-dismantlement state, also under the effective confined state of back cover to the cavity under shed, realized the inseparable cooperation between back cover and the cavity under shed both, in order to prevent to appear leaking under non-operating condition or operating condition.

After the back cover 114 is disposed, the other end of the spring 116 is supported to the back cover 114 and elastically supports the clamp carrier, and in a general form, especially in a working state, after the clamp carries a workpiece, the pressed clamp carrier and the back cover are limited from two ends of the spring 116 to be in a compressed state, that is, the clamp carrier is pressed and moved downwards in the figure, and after the workpiece is removed after processing, the spring 116 is restored and the clamp carrier is moved upwards and returned. Of course, in order to further define the back cover to the lower part of the cylinder, a base 118 may be further defined at the bottom of the cylinder, which enables the back cover 114 to be better defined to the bottom of the cylinder 101. The base 118 may be connected to a threaded hole in the bottom of the cylinder by screws through holes in the base 118.

The cylinder 101 is further formed with a pressure chamber 102, which is used for cooperating with a power device, and further adjusts the pressure of the working chamber 105 by adjusting the pressure of the pressure chamber 102, so as to adjust the carrying capacity of the workpiece, one end of the pressure chamber 102 has an opening located on the side wall of the cylinder 101, the other end of the pressure chamber 102 extends into the cylinder 101, forming a closed structure, and the working chamber 105 and the reservoir chamber 106 are both connected to the pressure chamber 102, and are mainly used for providing pressure by an external power source and transmitting pressure at least to the working chamber 105. The pressure chamber 102 is intended to cooperate with a power source such as a cylinder to provide sufficient working fluid pressure to the working chamber 105, which pressure is also transmitted between the working chamber 105 and the reservoir chamber 106. Further, the pressure chamber 102 is formed below the reservoir chamber 106.

The cylinder body 101 is further provided with an external connecting pipe I104 and an external connecting pipe II 103, the external connecting pipe I104 and the external connecting pipe II 103 are normally in a closed state under the working state, the external connecting pipe I104 and the external connecting pipe II 103 are adjacently arranged on one side, far away from the working cavity 105, of the pressure cavity 102, and the external connecting pipe I104 and the external connecting pipe II 103 are communicated with the pressure cavity 102. Furthermore, the junction between the external connection pipe I104 and the external connection pipe II 103 and the pressure chamber 102 is formed with a transition section III 1021 and a transition section III 1022. At this time, a transition section III 1022 is formed at the lower portion of the reservoir chamber 106 and communicates with the bottom of the reservoir chamber 106.

As shown in fig. 2, a sinking portion 107 is further formed at the bottom of the reservoir 106, and the sinking portion 107 is recessed from the bottom of the reservoir 106 toward the pressure chamber 102 and connected to the transition section iii 1022.

The bottom of the subsidence part 107 is also provided with a transition pipe 108, and the transition pipe 108 is communicated between the transition section III 1022 and the subsidence part 107.

The working chamber 105 is also communicated with a transition section I1031, and the transition section I1031 is communicated with a transition section III 1021. In fig. 3, the transition section i 1031 coincides with the center line of the extension tube ii 103, i.e., both extend in the same direction. Under the normal state, the external connecting pipe I104 and the external connecting pipe II 103 are both sealed by the sealing piece 120.

In order to realize that the clamp carrier is driven by the pressure of the piston 112, that is, the piston 112 moves in the working chamber by the hydraulic pressure, a power device of a power source such as a cylinder 201 or a motor can be arranged, and the power device can be used for adjusting the pressure of the hydraulic medium in the cylinder body, that is, adjusting the movement of the piston 112 in the working chamber through the adjustment of the pressure, so as to drive the clamp carrier to support or clamp the workpiece. The power device is provided with a pressure shaft which is used for being matched with the pressure cavity, is arranged in the pressure cavity and is tightly matched with the inner wall of the pressure cavity, and the support of the clamp carrier is realized by moving the pressure shaft in the pressure cavity along the extension direction of the pressure shaft, namely adjusting the depth of the pressure shaft in the pressure cavity, namely adjusting the pressing degree of the hydraulic medium in the pressure cavity. For driving the pressure shaft, it may be connected to a cylinder, where a reciprocating linear cylinder may be directly selected, through whose reciprocating piston connection the own power shaft 202 is driven, and through the movement of the power shaft 202 the pressure shaft 205 is moved in the pressure chamber. The drive here can of course also be realized by a motor-driven linear travel screw, i.e. by two motor-driven co-operating screws meshing in parallel, one of which is driven by the motor shaft to rotate in a defined position and the other screw is driven by the co-operating screw threads to move in the direction of extension of its shaft, thus converting the rotation of the motor into a linear movement.

In order to improve the sealing fit between the pressure shaft and the pressure chamber, a pressure seal ring 206 is further provided on the pressure shaft 205. The pressure sealing ring is arranged at the sealing position of the pressure shaft, the seal can be an annular groove sunken into the pressure shaft, as shown in fig. 7, the pressure shaft and the seal can be provided with a plurality of groups of matching, namely two groups.

In addition, in order to define the pressure shaft for better fit with the pressure chamber and better stability, a pressure shaft seat 203 may be provided, on which a pressure shaft hole 204 is provided for fitting with the pressure shaft, i.e. a pressure shaft 205 passes through the pressure shaft hole 204 and then into the pressure chamber in a defined manner, and the pressure shaft is defined to the cylinder body by the pressure shaft seat for defining and connecting the pressure shaft.

When the pneumatic clamp is in use, when the pneumatic cylinder is used as a power source, the shaft of the pneumatic cylinder transmits power to the pressure shaft to pressurize hydraulic medium in the pressure chamber 102, at the moment, the medium in the working chamber 105 is pressurized through pressure transmission of the medium in the transition section I1031 and the transition section III 1021, so that the piston 112 of the working chamber 105 is stressed to support a clamp carrier on the piston 112 to support a workpiece, meanwhile, because the working chamber 105 and the liquid storage chamber 106 are communicated through the transition section I1031, the transition section 1021 III, the transition section III 1022, the transition pipe 108 and the sunken part 107 for pressure transmission, the workpiece is arranged on the clamp carrier, the pressure given by the workpiece chamber piston 112 can be transmitted to the liquid storage chamber 106 and fed back to the pressure chamber 102 for buffering, and meanwhile, the spring 116 connected to the convex body 110 buffers the pressure of the workpiece received by the clamp carrier through the buffering of the spring 116, thereby avoiding the occurrence of undamped rigid impact, and the requirement on an additional hydraulic system is also avoided, so that the system balance of the clamp is fundamentally realized, and the structure of the processing equipment is simplified. After the machining is finished, the workpiece is removed from the clamp carrier, that is, is moved out of the carrier 117, the pressure of the working chamber is released, and then the pressure of the hydraulic medium in the liquid storage chamber and the pressure chamber is also released, the spring 116 supports the clamp carrier to reset, and the cylinder can perform reverse operation, that is, the pressure shaft is drawn out of the pressure chamber, so that the pressure of the medium is further released, and the hydraulic balance system of the clamp is restored to a non-working state.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. Balanced anchor clamps, including the hydraulic pressure balancing portion, it includes:

a piston cooperatively disposed within the working chamber;

a clamp carrier connected to the piston through the upper cavity opening.

2. The balance clamp of claim 1, wherein the clamp carrier comprises a stage having a work surface for holding the workpiece, and a convex body coupled to the stage offset from the work surface and protruding outward of the stage;

the piston further comprises a mounting hole, and the convex body is arranged in the mounting hole in a matched mode.

3. The balance clamp of claim 2, wherein the carrier and the convex body are both in a column structure, the maximum diameter of the carrier is larger than that of the convex body, the top surface of the carrier is a working surface, and the bottom surface of the carrier is connected with the convex body.

4. The balance clamp of claim 2, wherein the mounting hole of the piston extends through the piston along an axis of symmetry of the piston.

5. The balance clamp of claim 4, wherein the convex body is further formed with a limiting body on the other side away from the carrier.

6. The balance clamp of any one of claims 1 to 5, wherein the hydraulic balance portion further comprises a spring disposed in the working chamber and having at least one end sleeved outside the restriction body and forming an elastic support for the clamp carrier.

7. The balance clamp of claim 6, wherein the working chamber extends through the cylinder body and forms an upper chamber opening and a lower chamber opening on a pair of faces thereof, respectively.

8. The balance clamp of claim 7, wherein the hydraulic balance further comprises a back cover, wherein the back cover is in sealed connection with the lower opening of the cavity.

9. The balance clamp of claim 8, wherein the other end of the spring is supported to the back cover and forms a resilient support for the clamp carrier.