CN212239234U

CN212239234U - Lever double-acting hydraulic chuck

Info

Publication number: CN212239234U
Application number: CN202020893189.2U
Authority: CN
Inventors: 马德华
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2020-12-29
Anticipated expiration: 2030-05-25

Abstract

The utility model provides a double acting hydraulic chuck of lever, it includes: the hydraulic system is driven by two hydraulic oil cylinders with different sectional areas, the oil supply system is connected with the upper hydraulic oil cylinder and the lower hydraulic oil cylinder through the same loop to supply oil for the two hydraulic oil cylinders, and the sectional areas in working cavities of the two hydraulic oil cylinders are different in size; the chuck body is provided with a clamping area for placing a piece to be clamped, two pairs of clamping jaws are distributed around the clamping area in an annular manner, the opposite clamping jaws are in the same pair, the two clamping jaws in the same pair are arranged symmetrically in the middle along the same central line on the chuck body, and the symmetric centers of the two clamping jaws are the centers of the clamping areas; each pair of claws is connected with a piston rod of one of the hydraulic oil cylinders through a transmission component. The utility model discloses a to each jack catch adopt the pneumatic cylinder drive that has different intracavity sectional areas respectively to realize different groups and promote the successive centering of blank to the jack catch, finally realize pushing the blank to chuck center and chucking.

Description

Lever double-acting hydraulic chuck

Technical Field

The utility model relates to the field of machining, especially, relate to a lever double acting hydraulic chuck that is used for automatic centering chucking of bridge beam supports rectangle blank.

Background

At present, in the machining process of a vertical lathe in the mechanical industry, a rectangular blank needs to be centered and clamped, but because the blank is irregular in appearance, the existing universal hydraulic chuck cannot be used for automatic centering and clamping, only a manual chuck can be used for centering and clamping, the labor intensity is high, and the working efficiency is also severely restricted. Taking a bridge support processing process in the high-speed rail industry as an example, the clamping time and the processing time in the bridge support processing process are basically the same, the processing efficiency is low, and the production cost is further improved.

SUMMERY OF THE UTILITY MODEL

In view of the above prior art's shortcoming, the utility model aims to provide a hydraulic chuck for solve among the prior art unable automatic centering chucking of rectangle bridge beam supports blank and dress card problem consuming time too much, inefficiency.

To achieve the above and other related objects, the present invention provides a lever double acting hydraulic chuck, which includes:

the hydraulic system comprises an oil supply system and two hydraulic oil cylinders, wherein the oil supply system is connected with the two hydraulic oil cylinders through the same loop to supply oil to the two hydraulic oil cylinders, and the cross-sectional areas in working cavities of the two hydraulic oil cylinders are different in size;

the clamping device comprises a chuck body and two pairs of clamping jaws, wherein the chuck body is provided with a clamping area for placing a piece to be clamped, all the clamping jaws are distributed around the clamping area in an annular manner, two clamping jaws in the same group of pairs are arranged along the same straight line on the chuck body in a sliding manner, and the symmetric centers of the two clamping jaws are the centers of the clamping areas;

each pair of claws is connected with a piston rod of one of the hydraulic cylinders through a transmission component, and the transmission component comprises: the boosting device comprises push-pull blocks and symmetrically arranged boosting levers, wherein one end of each boosting lever is connected with a clamping jaw, the other end of each boosting lever is connected with the push-pull blocks, and the push-pull blocks are connected with piston rods of one hydraulic oil cylinder.

In one embodiment, the two hydraulic oil cylinders are coaxially arranged, and piston rods of the hydraulic oil cylinders with large sectional areas pass through the centers of the piston rods of the hydraulic oil cylinders with small sectional areas and are in sliding sealing fit with each other.

In one embodiment, an oil cylinder barrel is vertically arranged on the chuck body, a middle cylinder cover is arranged in the oil cylinder barrel, an inner cavity of the oil cylinder barrel is divided by the middle cylinder cover to form two hydraulic oil cylinders, namely a first hydraulic oil cylinder and a second hydraulic oil cylinder, and a piston rod of the first hydraulic oil cylinder penetrates through a piston rod of the second hydraulic oil cylinder.

In one embodiment, the cylinder barrel of the oil cylinder and the clamping jaws are respectively arranged on the front side and the back side of the chuck body.

In one embodiment, the jaws are symmetrically and centrally installed in two groups and are respectively driven by the two hydraulic oil cylinders through the two push-pull blocks and the corresponding boosting levers, when the hydraulic system supplies oil to the two hydraulic oil cylinders with different internal cross sections in the same loop, the push-pull speed of the hydraulic oil cylinder with a small internal cross section is higher than that of the hydraulic oil cylinder with a large internal cross section, so that the push-pull blocks respectively driven by the two hydraulic oil cylinders are different in the speed of stirring the jaws, the jaws are in contact with a clamped blank firstly and then are in contact with the blank slowly, the jaws which are in contact with the blank firstly are stopped in place by the blockage of the blank, the other group of jaws are driven by the hydraulic oil cylinder with a large internal cross section, and the pulling force of the hydraulic oil cylinder with a large internal cross section is larger than that of, and the pulled clamping jaws overcome the clamping resistance of the other two clamping jaws to push the blank to be centered, and when the four clamping jaws are in full contact with the blank, the pressure of the hydraulic system is increased to reach a set pressure and the blank is clamped simultaneously.

In one embodiment, the chuck body is provided with a central hole, a guide sleeve is sleeved in the central hole, and all the push-pull blocks are located in the guide sleeve and move along the guide sleeve.

In one embodiment, the push-pull block is provided with a groove, and one end of the force-increasing lever is clamped in the groove.

In one embodiment, the jaws are provided with racks, the racks and the rack sliding blocks are fixed to be integrated by screws and slide on groove-shaped guide rails of the chuck body, and the sliding mechanism comprises: establish guide rail and the slip on the chuck body are located jack catch rack slide block on the guide rail.

As mentioned above, the utility model discloses a double acting hydraulic chuck of lever has following beneficial effect: the principle that the load of a hydraulic system determines the pressure is utilized for automatically centering and clamping a bridge support blank (namely the to-be-clamped piece), the clamping device comprises two pairs of opposite clamping jaws, and each pair of clamping jaws are respectively driven by hydraulic cylinders with different cross sections in working cavities, so that the blank is centered by different pairs of clamping jaws in sequence, and finally, the blank is pushed to the center of a clamping area and clamped; in addition, all the hydraulic cylinders are coaxially arranged and can be vertical to the chuck body, so that the chuck is more suitable for matching with various vertical machine tools; every jack catch in the hydraulic chuck all participates in the chucking to solved the automatic centering chucking difficult problem of present machining trade to rectangle blank, improved work efficiency, reduced operator's intensity of labour, can form a complete set to the lathe trade, improved the lathe automation, had good application prospect.

Drawings

Fig. 1 is a top view of a hydraulic chuck in an embodiment of the present invention;

fig. 2 is a cross-sectional view of a hydraulic chuck in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first push-pull block in an embodiment of the present invention;

fig. 4 is a schematic structural view of a power lever according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an oil cylinder barrel in an embodiment of the present invention.

Description of the element reference numerals

1 jaw 1

2 jaw 2

3 oil cylinder barrel

31 middle cylinder cover

32 hydraulic joint

33 Top cylinder cover

34 oil port 1

35 oil port two

36 oil port III

Four port 37

41 second hydraulic cylinder

411 working chamber

412 reduction chamber

42 piston

43 piston rod

51 first hydraulic cylinder

511 working chamber

512 reset cavity

52 piston

53 piston rod

6 chuck body

71 push-pull block one

711 groove

72 power lever

721 rotating part

722 big arm

723 small arm

81 push-pull block II

9 rack slide block

10 guide sleeve

11 dust cover

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to fig. 1 to 5. It should be understood that the structures, ratios, sizes, etc. shown in the drawings of the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any modification of the structures, changes of the ratio relationship, or adjustment of the sizes should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

As shown in fig. 1 to 2, the utility model provides a lever double-acting hydraulic chuck, which comprises: the hydraulic system comprises an oil supply system and a hydraulic system, wherein the oil supply system comprises two hydraulic cylinders (in the embodiment, two hydraulic cylinders are shown, namely a first hydraulic cylinder 51 and a second hydraulic cylinder 41), the oil supply system is connected with the two hydraulic cylinders through a same loop to supply oil to the hydraulic cylinders, the sectional areas of the working cavities of the hydraulic cylinders are different, and the sectional area of the working cavity of the second hydraulic cylinder 41 is smaller than that of the working cavity of the first hydraulic cylinder 51;

the chuck comprises a chuck body 6 and two pairs of jaws (a first jaw 1 and a second jaw 2 in the embodiment), wherein a clamping area for placing a piece to be clamped is arranged on the chuck body 6, all the jaws are distributed around the clamping area in an annular manner, two jaws in the same pair are arranged along the same straight line on the chuck body 6 in a sliding manner, and the symmetric centers of the two jaws are the centers of the clamping area;

each pair of claws is connected with a piston rod of one of the hydraulic oil cylinders through a transmission component.

The embodiment utilizes the principle that the load of a hydraulic system determines the pressure, is used for automatically centering and clamping a bridge support blank (namely the to-be-clamped part), and comprises a plurality of pairs of opposite clamping jaws, wherein each pair of clamping jaws are respectively driven by hydraulic oil cylinders with different cross sections in working cavities, so that the blank is centered successively by different pairs of clamping jaws, and finally, the blank is pushed to the center of a clamping area and clamped.

For convenience of description, the embodiment takes two hydraulic oil cylinders and two pairs of jaws as an example, the number of pairs of the hydraulic oil cylinders and the jaws is not limited to this, and more pairs of the hydraulic oil cylinders and the jaws can be arranged so as to better clamp the to-be-clamped member.

Referring to fig. 1, in the present embodiment, the chuck body 6 is circular, each of the jaws 1 is located on a certain diameter of the chuck body 6 and slides in a radial direction, and the symmetric center of each pair of jaws 1 is located at the center of the chuck body 6. Referring to fig. 1 and 2, the present embodiment includes two pairs of jaws, and sliding tracks of the two pairs of jaws are perpendicular to each other, namely, a first jaw 1 and a second jaw 2.

In order to realize the sliding of each clamping jaw, the sliding rail with the same number as the clamping jaws is arranged on the chuck body 6 in the embodiment, the sliding rail extends along the radial direction of the chuck body to play a guiding role, the sliding rail is provided with a rack sliding block 9 in the embodiment, and the clamping jaws are fixed on the rack sliding block 9 and slide along the sliding rail along with the rack sliding block.

In order to be more suitable for being matched with a vertical machine tool in the embodiment, all the hydraulic oil cylinders are coaxially arranged, and piston rods of all the hydraulic oil cylinders are coaxially sleeved and are in sliding fit with each other. The embodiment specifically includes: the chuck body 6 is vertically provided with an oil cylinder barrel 3, the top of the oil cylinder barrel 3 is provided with a top cylinder cover 33, the oil cylinder barrel 3 is internally provided with a middle cylinder cover 31, the middle cylinder cover 31 divides the inner cavity of the oil cylinder barrel 3 to form two hydraulic oil cylinders, namely a first hydraulic oil cylinder 51 and a second hydraulic oil cylinder 41, and a piston rod 53 of the first hydraulic oil cylinder 51 is arranged in a piston rod 43 of the second hydraulic oil cylinder 41 in a penetrating manner, namely the diameter of the piston rod 53 of the second hydraulic oil cylinder 51 is larger in the embodiment, so that the inner cross-sectional area of a working cavity 411 of the second hydraulic oil cylinder 41 is reduced. The second hydraulic cylinder 41 comprises a working chamber 411 and a reset chamber 412, for example, pressure oil is introduced into the working chamber 411, the piston rod 43 and the piston 42 move downwards, and when the pressure oil is introduced into the reset chamber 412, the piston rod 43 and the piston 42 move upwards. The first hydraulic cylinder 51 has the same structure as the second hydraulic cylinder 42 and comprises a working chamber 511 and a reset chamber 512, for example, pressure oil is introduced into the working chamber 511, the piston rod 53 and the piston 52 move downwards, and when the pressure oil is introduced into the reset chamber 512, the piston rod 53 and the piston 52 move upwards. It should be noted that the sealing means is disposed at the position where the piston rod 53 penetrates the middle cylinder cover 31 and the position where the piston rod 43 is matched with the top cylinder cover 33, and the sealing means is known to those skilled in the art and will not be described in detail herein.

In this embodiment, a pressure oil delivery channel is provided in the cylinder barrel 3, and an oil port is provided corresponding to each of the working chamber and the reset chamber, and the pressure oil enters the pressure oil delivery channel through the hydraulic joint 32. Specifically, as shown in fig. 5, the wall of the cylinder barrel 3 in this embodiment has a plurality of oil path structures (i.e., pressure oil conveying channels), the oil path structures respectively communicate with the working chamber 411, the reset chamber 412, the working chamber 511, and the reset chamber 512 through the first oil port 34, the second oil port 35, the third oil port 36, and the fourth oil port 37 shown in fig. 5, and the hydraulic system can control pressure oil to enter different chambers through corresponding oil ports.

In order to facilitate the above-mentioned piston rod to promote the corresponding jack catch to slide, the drive assembly in this embodiment includes: the boosting device comprises push-pull blocks and symmetrically arranged boosting levers, wherein one ends of the boosting levers are connected with clamping jaws, the other ends of the boosting levers are connected with the push-pull blocks, and the push-pull blocks are connected with piston rods of the opposite hydraulic cylinders. The method specifically comprises the following steps: as shown in fig. 2, the jaw one 1 is fixed on the rack slider 9, the rack slider 9 is connected with one end of a power lever 72, the other end of the power lever 72 is connected with a push-pull block one 71, the push-pull block one 71 is connected with the piston rod 42, i.e. the second hydraulic cylinder 41 drives the jaw one 1 to move; the second jaw 2 is in transmission connection with a second push-pull block 81 through a boosting lever, and the second push-pull block 81 is fixedly connected with the piston rod 53, namely the first hydraulic oil cylinder 51 pushes the second jaw 2 to move. In order to adapt to the axial arrangement, the second push-pull block 81 and the first push-pull block 71 in the embodiment are crossed, and a gap in the vertical direction exists between the two blocks, so that the movement of the two blocks is satisfied. The first push-pull block 71 is a block structure, and may be cylindrical or rectangular, as shown in the schematic structural diagram of the first push-pull block 71 shown in fig. 3, the first push-pull block 71 is a rectangular structure, and a central through hole for the piston rod 53 to pass through is formed in the center of the first push-pull block 71. In this embodiment, the top of the piston rod 43 is provided with a platform abutting against the bottom of the first push-pull block 71, and the fixing bolt passes through the platform from below to fix the piston rod 43 and the first push-pull block 71 together.

As an embodiment, a pair of force-increasing levers 72 interacting with the first push-pull block 71 are respectively located at two sides of the first push-pull block 71 and are oppositely arranged, as shown in FIG. 4, the force-increasing levers 72 comprise a rotating part 721, and a large arm 722 and a small arm 723 which are mutually connected with the rotating part 721, and the length of the large arm 722 is larger than that of the small arm 723. The push-pull block one 71 can push and pull the large arm 722, so as to drive the power lever 72 to rotate around the rotating portion 721, and the small arm 723 interacts with the corresponding jaw one 1 to transfer the push-pull force of the push-pull block one 71 to the jaw one 1. Since the large arm 722 is longer than the small arm 723, the force-increasing lever 72 can multiply the push-pull force of the push-pull block one 71 to the jaw one 1 according to the lever principle. In the present embodiment, the matching manner of the first push-pull block 71 and the power-increasing lever 72 is as shown in fig. 2 and 3, the middle portion of the first push-pull block 71 is provided with a groove 711 with a circumferential oil port, the width of the groove 711 is greater than the end portion of the large arm 722, the large arm 722 can extend into the groove 711, the width of the groove 711 should meet the requirement that the large arm 722 can be driven to rotate when the first push-pull block 71 moves upwards or downwards, and the dimensions of the groove 711 and the large arm 722 can be designed according to actual conditions. In other embodiments, the first push-pull block 71 can cooperate with the large arm 722 through other configurations, such as a snap fit. In this embodiment, a groove is formed in the bottom of the rack slider 9, the end of the small arm 723 is clamped in the groove, the small arm 723 and the rack slider 9 are limited by the limiting structure, so that the small arm 723 can drive the rack slider 9 to move, and the matching structure between the rack slider 9 and the small arm 723 is not limited thereto.

When the push-pull block 71 moves downwards, the force-increasing lever 72 on the left side of the push-pull block 71 rotates clockwise, the force-increasing lever 72 on the right side rotates anticlockwise, so that the force-increasing lever 72 on the left side pushes the jaw I1 on the left side to move rightwards along with the rack slide block 9 below the jaw I, the force-increasing lever 72 on the right side pushes the jaw I1 on the right side to move leftwards along with the rack slide block 9 below the jaw I, therefore, the two opposite jaw I1 are close to each other, and optionally, the maximum moving distance of the jaw I1 is 15mm, the maximum moving distance of the jaw is related to a hydraulic oil cylinder and a transmission assembly.

The second jaw 2 is in transmission connection with the second push-pull block 81 through another boosting lever, which is the same as the transmission connection of the first push-pull block 71 and the first jaw 1, and will not be described in detail herein. The connection mode of the second push-pull block 81 and the piston rod 53 is the same as that of the first push block 71 and the piston rod 43, and other connection modes can be adopted, and only the fixed connection is needed to realize motion transmission.

For example, the chuck body 6 is provided with a central hole, a guide sleeve 10 is sleeved in the central hole, and the first push-pull block 71 and the second push-pull block 81 are positioned in the guide sleeve 10 and move up and down along the guide sleeve 10, so that the movement stability is improved. The central hole on the chuck body 6 is provided with a dust cover 11, which prevents iron chips and dust from entering the interior of the transmission assembly of the hydraulic chuck.

The following describes the working process of the lever double-acting hydraulic chuck provided by the present invention, taking the embodiment of the lever double-acting hydraulic chuck shown in fig. 1 and 2 and described above as an example:

the lever double-acting hydraulic chuck is fixed on a machine tool spindle, pressure oil controlled by a hydraulic system simultaneously enters working

cavities

411 and 511 of a first hydraulic oil cylinder 51 and a second hydraulic oil cylinder 41 through a hydraulic joint 32, two

piston rods

43 and 53 both move downwards, and a pair of corresponding clamping jaws are driven to move oppositely through a push-pull block and a boosting lever, namely to move towards the center of a clamping area. Because the pressure oil inflow speeds of the two hydraulic oil cylinders are the same, and the sectional area of the working cavity of the second hydraulic oil cylinder 41 is smaller than that of the working cavity of the first hydraulic oil cylinder 51, the descending speed of the piston rod 43 is greater than that of the piston rod 53, namely the descending speed of the first push-pull block 71 is greater than that of the second push-pull block 81, and the running speed of the first jaw 1 is greater than that of the second jaw 2. The first jaw 1 will thus first contact the blank and, since the two pairs of jaws are arranged symmetrically in the middle, the blank will be pushed towards the centre of the two jaws, when both jaws 1 are blocked by the blank from further movement after the blank has been centred by the two jaws 1. The piston rod 53 continues to push the second jaws 2 which are not in contact with the blank downwards to approach, when one of the second jaws 2 contacts the blank, because the sectional area of the working cavity of the first hydraulic oil cylinder 51 is larger than that of the working cavity of the first hydraulic oil cylinder 41, under the same pressure, the clamping force of the second jaws 2 is inevitably larger than that of the first jaws 1, the blank is continuously pushed to the centers of the two second jaws 2 by overcoming the clamping resistance of the first jaws 1, and the blank is pushed to the center position of the area to be clamped through the centering of the first jaws 1 and the second jaws 2 in different directions. And then the four clamping jaws are all contacted with the blank, the pressure of the hydraulic cylinder system is continuously increased, so that the two piston rods continuously move downwards, and the blank is clamped, so that the blank is centered and clamped. After the machining process is finished, the hydraulic system controls pressure oil to enter the reset cavities of the two hydraulic oil cylinders, so that the two piston rods move upwards, and the piston rods move upwards to cause each pair of clamping jaws to be away from each other to loosen the blank.

Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A lever double acting hydraulic chuck, characterized in that it comprises:

the hydraulic system comprises an oil supply system and two hydraulic oil cylinders, wherein the oil supply system is connected with the two hydraulic oil cylinders through the same loop to supply oil to the hydraulic oil cylinders, and the cross-sectional areas in working cavities of the two hydraulic oil cylinders are different in size;

the clamping device comprises a chuck body and two pairs of clamping jaws, wherein a clamping area for placing a piece to be clamped is formed in the chuck body, all the clamping jaws are distributed annularly around the clamping area, two clamping jaws in the same pair are arranged in a sliding mode along the same straight line on the chuck body, and the symmetrical centers of the two clamping jaws are the centers of the clamping area;

each pair of claws is connected with a piston rod of one of the hydraulic cylinders through a transmission component, and the transmission component comprises: the boosting device comprises a push-pull block and a boosting lever which is rotatably arranged, wherein one end of the boosting lever is connected with a clamping jaw, the other end of the boosting lever is connected with the push-pull block, and the push-pull block is connected with a piston rod of a hydraulic oil cylinder which is opposite to the push-pull block.

2. The lever double-acting hydraulic chuck according to claim 1, characterized in that: all the hydraulic oil cylinders are coaxially arranged, and piston rods of the hydraulic oil cylinders are coaxially sleeved and mutually matched in a sliding manner.

3. The lever double-acting hydraulic chuck according to claim 1, characterized in that: the chuck is characterized in that an oil cylinder barrel is vertically arranged on the chuck body, a middle cylinder cover is arranged in the oil cylinder barrel, an inner cavity of the oil cylinder barrel is divided by the middle cylinder cover to form two hydraulic oil cylinders, the two hydraulic oil cylinders are respectively a first hydraulic oil cylinder and a second hydraulic oil cylinder, and a piston rod of the first hydraulic oil cylinder penetrates through a piston rod of the second hydraulic oil cylinder.

4. The lever double-acting hydraulic chuck according to claim 1, characterized in that: the clamping jaws are symmetrically and centrally arranged in two groups and are respectively driven by the two hydraulic oil cylinders through the two push-pull blocks and the corresponding boosting levers, when the hydraulic system supplies oil to the two hydraulic oil cylinders with different internal cross sections in the same loop, the push-pull speed of the hydraulic oil cylinder with a small internal cross section is higher than that of the hydraulic oil cylinder with a large internal cross section, so that the push-pull blocks respectively driven by the two hydraulic oil cylinders are different in speed of stirring the clamping jaws, the clamping jaws are firstly contacted with a clamped blank and then contacted with the blank, the clamping jaws firstly contacted with the blank are stopped in place under the blockage of the blank, the other group of clamping jaws are driven by the hydraulic oil cylinder with a large internal cross section, the pulling force of the hydraulic oil cylinder with a large internal cross section is larger than that of the hydraulic oil cylinder with a small internal cross section, and the pulled clamping jaws overcome the clamping resistance of the other, when the four jaws are all in contact with the blank, the hydraulic system pressure is raised to a set pressure while simultaneously gripping the blank.

5. The lever double-acting hydraulic chuck according to claim 1, characterized in that: the chuck is characterized in that a center hole is formed in the chuck body, a guide sleeve is sleeved in the center hole, and all the push-pull blocks are located in the guide sleeve and move along the guide sleeve.

6. The lever double-acting hydraulic chuck according to claim 1, characterized in that: the jack catch with the chuck body passes through slide mechanism and links to each other, slide mechanism includes: establish guide rail on the chuck body and slide in slider on the guide rail, the jack catch is fixed on the slider.