KR101511770B1 - Hydraulic chuck for turning machining of rear end for hydraulic cylinder of excavator - Google Patents

Abstract

The present invention relates to a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator, in which a wedge plunger (30) is lifted and lowered by a main shaft (20) Wherein the jaws (60) provided on the master jaw (40) and the upper portion of the chuck housing (10) in a radial direction of the main shaft (20) And the wedge plunger 30 is pivotally supported on the outer circumferential surface of the chuck housing 10 so as to be able to ascend and descend by spring elasticity. The cover 12, which is provided to cover the center of the upper surface of the chuck housing 10 with a predetermined diameter, And a head 51 having an outer circumferential surface at a predetermined angle of inclination is formed in the upper end of the upwardly protruding upper portion so that the diameter gradually decreases from the upper end portion to a predetermined height Stud (50); A first locating block (71) fixedly coupled to the cover (12) in a straight line in a radial direction with one of the jaws (60), a first locator block (72) And a first locator 73 which is coupled to the fixed block 71 and the first locator block 972 so that the bottom surface of the connecting portion between the fixed portion 91 of the rear end 90 and the axial coupling portion 92 is positioned. A first support block 70; A second fixing block 81 fixedly coupled to the cover 12 radially above the jaws 60 as a result of radial movement, and a second fixing block 81 connected to the cover 12 so as to be slidable in the radial direction at an upper portion of the second fixing block 81 And a second locator 83 for holding both sides of the lower end surface of the cylindrical shaft coupling portion 92 of the rear end 90 while being axially fixed to an upper portion of the slide block 82, And the support block 80 is coupled.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic chuck for turning a rear end of a hydraulic cylinder for an excavator,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator, and more particularly, to a hydraulic chuck for rear end turning of an hydraulic cylinder for an excavator, To a hydraulic chuck for a rear end linear machining of a hydraulic cylinder for an excavator.

Generally, a hydraulic cylinder is used as a driving means because a driving force greater than a certain level is required for a heavy equipment such as an excavator.

Hydraulic cylinders applied to heavy equipment have the same shape and operation as ordinary hydraulic cylinders, but they are large in size and have different driving forces applied through hydraulic cylinders.

However, the hydraulic cylinders used for heavy equipment are heavier in weight than the larger ones, so the manufacturing of hydraulic cylinders is different from the production of general hydraulic cylinders.

In this hydraulic cylinder, a rear end, which is formed at the rear end of the cylinder body, has a fixed portion, one side of which is connected to the cylinder body by welding, and a ring- And are integrally connected.

The rear end of the hydraulic cylinder is subjected to a post-forming turning process to process the shaft hole of the shaft coupling portion and both end faces of the shaft hole, and then the one fixed portion is welded to the cylinder main body.

On the other hand, the rear end of the hydraulic cylinder is made by vertical machining because the weight is very heavy during the turning process. In order to prevent the flow of the workpiece during machining, the surface is machined using a hydraulic chuck, .

As a hydraulic chuck used as a fixing means for turning the rear end of a hydraulic cylinder, JP-A-1062912 (hereinafter abbreviated as "hydraulic chuck") is representative.

The hydraulic chuck of the prior art has a wedge plunger fixed to the upper portion of a central spindle which vertically lifts a predetermined height from the lower portion of the chuck housing by the hydraulic pressure and ascends and descends with the main spindle, And the inner surface of the jaw engaging groove is inclined at a predetermined angle.

The jaw joining groove is connected to a jaw forming a downwardly inclined protrusion so as to have the same inclined surface as the guide surface. At this time, the jaw is prevented from being upward deviated from the jaw guide groove radially formed on the upper surface of the chuck housing, So that the slide can be moved.

Therefore, when the wedge plunger is moved up and down at a constant height by the ascending and descending of the main shaft, the jaw inserted with the oblique projection into the jaw coupling groove of the wedge plunger moves in the horizontal direction so that the workpiece to be machined by the plurality of jaws is fixed and released .

However, in order to process the rear end of the hydraulic cylinder using the hydraulic chuck of the prior art, only one end side of the shaft hole and the shaft hole can be machined. In order to process the other end side end surface, After reversing, it is possible to process the surface with the jaw fixed again.

If the rear end of the hydraulic cylinder is turned over one by one, the time required for machining one workpiece is increased, and the machining efficiency is lowered.

Particularly, in order to process various surfaces of a rear end of a hydraulic cylinder, a separate hydraulic chuck capable of fixing workpieces together with processing equipment for surface processing of a specific position is required, so that there is a very uneconomical problem that additional equipment must be provided.

Patent Registration No. 1062912 (Aug. 31, 2011)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a motorcycle which has a shaft hole inner diameter surface of a rear end of a weight, So that it is possible to perform a simple and rapid machining by making it possible to carry out machining of a hydraulic cylinder for an excavator.

Further, the present invention provides a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator, which can further improve the productivity by shortening the time required for machining, while greatly reducing the machining cost of the rear end while omitting the facility investment cost There is another purpose.

To achieve the above object, according to the present invention, a wedge plunger is lifted and lowered by a main shaft that moves up and down in conjunction with a hydraulic cylinder, and a master jaw in the radial direction of the chuck housing and a jaw provided in the upper portion of the chuck housing by the wedge plunger are radially And the wedge plunger is pivotally supported on the outer peripheral surface of the wedge plunger so that the wedge plunger can be lifted and lowered by spring elasticity. The center portion of the upper surface of the chuck housing is fixed to a predetermined diameter A stud which protrudes upward by a predetermined height through a vertical tube and forms a head whose diameter is gradually reduced from the upper end to a predetermined height at an upper end of the upper protruding portion so that the outer circumferential surface of the head is inclined at a predetermined angle; A first fixed block secured to the cover in a straight line in a radial direction of one of the jaws, a first locator block stacked and fixedly coupled to an upper surface of the first fixed block, a size of a rear end to be supported, And a first locator coupled to the first fixed block and the first locator block, the first locator having a bottom surface of a connection portion between the fixed portion of the rear end and the axial coupling portion, A second fixed block radially fixedly coupled to the cover between the jaws, a slide block connected to the upper portion of the second fixed block so as to be slidable in a radial direction, And a second support block including a second locator for holding both sides of the lower end surface of the cylindrical shaft coupling portion of the rear end.

The hydraulic chuck for rear end turning of the hydraulic cylinder for an excavator of the present invention according to the present invention has a relatively heavy weight rear end so that the shaft hole is directed to the vertical direction, The upper and lower surfaces together can be turned only by changing the tool.

Therefore, according to the present invention, the chucking for replacing the machined surface and the reworking of the rear end of the weight chain are unnecessary, and the productivity of the product is greatly reduced by continuously executing the turning process . ≪ / RTI >

Particularly, the present invention is characterized in that it is possible to support and chuck correspondingly to the size of the rear end which is a workpiece, thereby providing a very economical advantage that facility investment is no longer necessary.

1 is a side view illustrating an embodiment of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention
2 is a plan view illustrating an embodiment of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention.
3 is a perspective view illustrating a jaw for pressurizing the fixed portion of the rear end in a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention,
4 is a perspective view illustrating a jaw for press-fitting an axial coupling portion for pressing the outer peripheral surface of the shaft coupling portion of the rear end in a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention.
5 is a perspective view illustrating a first support block of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention,
6 is a perspective view illustrating a second support block of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention,
7 is a side view showing a state in which a rear end is seated by a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention
8 is a plan view showing a state where the rear end is fixed by jaws of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention
9 is an operating state diagram showing an operating structure for allowing the second locator to move away from the axial coupling portion of the rear end in a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention will be described in detail with reference to the accompanying drawings.

A hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention improves the hydraulic chuck of the prior art and is configured to firmly fix the rear end of the hydraulic cylinder for an excavator.

FIG. 1 is a side view illustrating an embodiment of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention, FIG. 2 is a plan view illustrating an embodiment of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention, The present invention includes a chuck housing 10, a main shaft 20, a wedge plunger 30, and a master jaw 40 of a hydraulic chuck.

The dual spindle 20 is configured to move up and down the center of the chuck housing 10 at a predetermined height in cooperation with a lower hydraulic cylinder (not shown).

The chuck housing 10 has a plurality of jaw guide grooves 11 formed radially from the outer circumferential surface of the chuck housing 10 and a wedge plunger 30 The wedge plunger 30 has a plurality of jaw coupling grooves 31 radially formed at a predetermined depth from the outer circumferential surface thereof.

The jaw joining groove 31 is formed such that a forming width on the inner diameter side is wider than a forming width on the outer diameter side, and a guide surface inclined at a predetermined angle is formed so that the inner diameter side end portion is gradually expanded outward from the upper end portion to the lower end portion.

A master jaw 40 having a moving oblique projection 41 is connected to each jaw engaging groove 31 of the wedge plunger 30.

The plurality of master jaws 40 are coupled so as to be able to slide simultaneously in the horizontal direction by the rise and fall of the wedge plunger 30. [

In the present invention, studs 50 are connected to the upper portion of the main shaft 20 and the jaws 60 having a constant height are connected to the respective master jaws 40.

FIG. 3 is a perspective view illustrating a jaw for pressurizing the fixed portion of the rear end in a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention, and FIG. 4 is a perspective view of the hydraulic cylinder for an excavator according to the present invention. In which the outer peripheral surface of the shaft coupling portion of the rear end is pressed by a hydraulic chuck for rear end turning of the shaft.

The jaw 60 according to the present invention is configured such that both ends of the fixed portion side end portion and the cylindrical outer circumferential surface portion of the outer circumferential surface of the cylindrical coupling portion integrally joined to the hydraulic cylinder at the rear end of the hydraulic cylinder for the excavator can be firmly fixed.

To this end, in the figure, the stationary pressurizing jaws 61 are provided so as to press the end surface of the stationary end of the rear end and a pair of jaws 62 for pressurizing the shaft coupling portion are provided so as to press the outer peripheral surface of the shaft coupling portion.

At this time, although there are differences in the shape of the fixing jaws 61 and the pressing jaws 62, the surfaces contacting the rear ends of the jaws 60 are provided with contact members It is most preferable that the first electrode 63 is coupled.

The cover 12 fixedly coupled to the inside of the jaws 60 movably provided along the jaw guide grooves 11 on the upper surface of the chuck housing 10 is provided with one of a plurality of jaws 60 The first support block 70 is firmly fixed to the first support block 70 in the radial direction on the same line as the fixed portion pressurizing jaw 61. The upper surface of the first support block 70 is provided with a hydraulic pressure The first locator (73) is provided to support one side of the bottom surface of the connecting portion connecting the fixed portion of the rear end of the cylinder and the axial coupling portion.

One or more second support blocks 80 opposed to the first support block 70 are coupled to the cover 12 and the slide block 70 is mounted on the upper portion of the second support block 80 to be movable in the radial direction. 82 are assembled to prevent separation from the second support block 80.

The lower end of the stud 50 is screwed to the upper end of the main shaft 20 and the wedge plunger 30 is axially fixed to the outer circumferential surface of the stud 50. [

The upper end of the stud 50 passing through the cover 12 of the chuck housing 10 upward by a certain height is provided with a head 51 which forms an inclined surface at a certain angle while the outer diameter gradually expands upward as shown in FIG.

A plurality of jaws 60 radially provided on the upper surface of the chuck housing 10 are moved in the radial direction and these jaws 60 are brought into close contact with each other by the close contact between the end of the fixed end of the rear end and the outer peripheral surface of the shaft engaging portion Make sure that the rear end is fixed to allow turning.

The first support block 70 and the second support block 80, which are the most characteristic structures of the present invention, are configured to be seated in a state in which the rear end of the chuck housing 10 is elevated by a predetermined height.

5 is a perspective view illustrating a first supporting block of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention. As shown in the figure, the first supporting block 70 includes a first fixing block 71 A locator block 72 fixed to the upper surface of the first fixing block 71 and a first connecting part connecting the fixing part of the rear end connected to the upper surface of the locator block 72 and the shaft coupling part, And a locator 73 as shown in Fig.

Since the first supporting block 70 is configured such that the first fixing block 71 is fixedly coupled to the cover 12 and the locator block 72 of the flat plate is stacked and fixedly coupled to the upper surface of the supporting block 71, 1 The first locator 73 of the support block 70 becomes a reference point for positioning the rear end.

The first locator block 72 is fixed to the front side of the upper surface of the first fixed block 71 and the first locator 73 is fixed to the upper side of the rear side of the first fixing block 71 where the locator block 72 is not laminated A locator coupling hole 720 is formed in the locator block 72 which is stacked on the first fixing block 71 so that the first locator 73 can be coupled to the locator coupling hole 710, .

However, it is more preferable that the locator engagement hole 720 formed in the locator block 72 is formed in the shape of a long hole so that the engagement position can be finely adjusted.

6 is a perspective view illustrating a second support block of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention. The second support block 80 includes a first support block 70, And is configured to support the lower end circumferential surface of the axial coupling portion, which is a cylindrical shape of the rear end, as opposed to supporting the bottom surface of the connection portion connecting the axial coupling portion.

Therefore, it is more preferable that the second support block 80 supports the lower end circumferential surface of the shaft coupling portion on both sides with respect to the end portion on the fixed end side of the rear end.

The second support block 80 is fixed on the upper surface of the cover 12 so as to be prevented from flowing in the rotation direction, And a slide block 82 is coupled to the upper portion of the second fixed block 81 so as to be slidable in the radial direction. The outer peripheral surfaces of the lower end of the shaft coupling portion of the rear end are fixed to the upper surface of the slide block 82, A second locator 83 is provided.

At this time, the slide block 82 has the inclined surface corresponding to the inclined surface of the head 51 at the upper end side of the stud 50 at the front and the rear end has the sliding movement of the slide block 82 at the second fixed block 81 A tip end of a slide block 82 formed to protrude from the second fixing block 81 so that a spring 84 is tangled between the stopper 85 coupled to the rear end of the block guide groove 810, The stud 50 is brought into close contact with the outer circumferential surface of the stud 50 projected to the upper portion of the cover 12 by the elastic force of the spring 84. [

On the other hand, a nut block 820 is inserted into the upper portion of the slide block 82 so that a nut hole can be vertically formed on the plate surface while the slide block 82 is slidable in the longitudinal direction thereof. And the second locator 83 is bolted so that the outer circumferential surface of the lower end of the shaft coupling portion of the rear end can be positioned in the plurality of formed nut holes.

Both the first locator 73 and the second locator 83 are adjustable in height, and such height adjustment is stably maintained by the locknut.

On the other hand, the first locator 73 and the second locator 83 can be changed in fixing position in the locator block 72 and the slide block 82 depending on the size of the supported rear end, More preferable.

The operation and effect of the present invention with the above configuration will be described in more detail.

7 is a side view showing a state in which the rear end is seated with a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention.

As shown in the drawings, the rear end 90 of the hydraulic chuck according to the present invention is configured such that the axial coupling portion 92, which is a tubular shape, is vertically shaped so as to be housed.

At this time, the second locator 83 of the second support block 80, which is paired with the first locator 73 of the first support block 70, The connecting portion between the engaging portions 92 and the lower end circumferential surface of the shaft coupling portion 92 are respectively positioned.

The second locator 83 provided in each of the pair of second support blocks 80 supports both lower end surfaces of the shaft coupling portion 92 of the rear end 90 to balance the center of gravity.

The second locator 83 is supported by the slide block 82 of the second support block 80 in such a manner that the stud 50 is lifted to the maximum so as to support the shaft coupling portion 92 of the rear end 90, The tip end portion forming the inclined surface at the upper portion by the elasticity is brought into a state in which it is brought into close contact with the outer peripheral surface of the lower side of the head 51 of the stud 50. [

At this time, the first support block 70 is provided with a pair of first locators 73 on both sides so as to support circular connection portions between the fixed portion 91 of the rear end 90 and the axial coupling portion 92 on both sides do.

When the rear end 90 is stably supported by the first support block 70 and the second support block 80, the stud 50 is gradually lowered by the main shaft 20 by driving the hydraulic cylinder.

When the stud 50 is lowered, the wedge plunger 30 axially coupled to the stud 50 is simultaneously lowered in the chuck housing 10 and when the wedge plunger 30 is lowered, Since the master jaw 40 integrally forming the moving oblique projection 41 is moved in the direction of the radial center of the chuck housing 10 As shown in FIG.

When the master jaws 40 are moved to the center, the jaws 60 coupled to the respective master jaws 40 are moved to the center at the same time to firmly fix the rear end 90 by the jaws 60.

8 is a plan view showing a state where the rear end is fixed by jaws of a hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to the present invention.

When a plurality of jaws 60 are moved along the jaw guide grooves 11 of the chuck housing 10 by a continuous interlocking operation by lowering the stud 50 as shown in the figure, The fixed end pressurizing jaw 61 presses the constant pressure while tightly contacting the end surface of the fixed portion 91 of the rear end 90 and the rear end 90 is pressed by the axial joint pressurizing jaw 62, And presses the axial coupling portion 92 at a constant pressure while being in close contact with both sides of the cylindrical outer peripheral surface of the shaft coupling portion 92 of the rotor.

The rear end 90 can be held firmly fixed by simultaneously pressing the fixed portion of the rear end 90 and the axial coupling portion 92 by a plurality of jaws 60. [

Meanwhile, when the stud 50 is fixed to the rear end 90 by a plurality of jaws 60 while the stud 50 descends at a predetermined height, the load applied to the rear end 90 is relatively reduced.

When the stud 50 descends at a certain height and the lower end of the wedge plunger 30 descends at a certain height with the driving of the jaw 90, the jaw 90 is stopped to move as it is no longer able to descend 9, the stud 50 can be further lowered at a constant height.

The stud 50 is elastically connected to the wedge plunger 30 by the return spring 50. When the wedge plunger 30 can not be lowered further, the stud 50 integrally connected to the hydraulic cylinder is rotated by the return spring It is possible to lower the constant height while compressing.

At this time, when the head 51 of the stud 50 comes into contact with the tip of the slide block 82 of the second support block 80, the slope of the head 51 and the slope of the tip of the slide block 82 come into close contact with each other, The slide block 82 is pushed outward while being horizontally moved by the lowering of the slide block 51.

The second locator 83 supporting the lower end face of the axial coupling portion 92 of the rear end 90 at the upper portion of the slide block 82 when the slide block 82 is moved backward by the projected width of the head 51, The shaft-engaging portion 92 is brought into a state of being separated from the lower end surface of the shaft-

The connecting portion between the fixing portion 91 of the rear end 90 and the shaft coupling portion 92 is still supported by the first locator 73 of the first supporting block 70, The second locators 83 are disengaged from the lower end surface of one end face of the cylindrical shape at the shaft engagement portion 92 of the shaft 90 and the lower end portion of the shaft engagement portion 92 floats on the air hole.

In this state, the tool holder chuck provided at the upper portion corresponding to the hydraulic chuck of the present invention is lowered to a predetermined height so that the tool is brought into contact with the upper surface of the rear end 90 on the shaft coupling portion 92 side and the inner diameter surface of the shaft hole The surface processing can be performed by rotating the hydraulic chuck.

Since the machining of the inner surface of the upper surface of the shaft engaging portion 92 and the shaft hole can be performed, the upper surface of the shaft engaging portion 92 and the inner diameter surface of the shaft hole can be simultaneously machined, have.

However, in the present invention, a machining tool capable of machining the lower surface of the shaft coupling portion 92 can be inserted through the shaft hole and interference with the lower surface of the rear end 90 on the shaft coupling portion 92 side It is possible to process the lower surface of the shaft coupling portion 92 by using the processing tool while keeping the state without moving or moving the rear end 90 because there is no such structure.

Therefore, according to the present invention, when the shaft coupling portion 92 of the rear end 90 is turned and the rear end 90 is chucked during the machining of the upper surface and the lower surface corresponding to each other, The upper surface and the lower surface of the shaft coupling portion 92 and the inner diameter of the shaft hole can be simultaneously turned by chucking.

Such workability not only shortens the turning process time significantly but also increases productivity and work efficiency.

10: chuck housing 12: cover
20: main shaft 30: wedge plunger
40: Master Joe 50: Stud
51: Head 60: JO
70: first supporting block 71: first fixing block
72: locator block 73: first locator
80: second supporting block 81: second fixing block
82: Slide block 83: Second locator
90: rear end 91:
92:

Claims (7)

The wedge plunger is moved up and down by a main shaft that moves up and down in conjunction with the hydraulic cylinder, and the master jaw in the radial direction of the chuck housing by the wedge plunger and the jaw provided in the upper portion of the chuck housing move in the radial direction, In the chuck,
The wedge plunger is pivotally supported on the outer circumferential surface of the main shaft so as to be able to be lifted and lowered by spring elasticity. The cover, which is provided to cover the center of the upper surface of the chuck housing with a predetermined diameter, A stud which protrudes upward to form a head having an outer circumferential surface at a predetermined inclination angle so that the diameter of the protruding upper portion gradually decreases from a top end to a predetermined height;
A first fixed block secured to the cover in a straight line in a radial direction of one of the jaws, a first locator block stacked and fixedly coupled to an upper surface of the first fixed block, a size of a rear end to be supported, And a first locator coupled to the first fixed block and the first locator block, the first locator having a bottom surface of a connection portion between the fixed portion of the rear end and the axial coupling portion,
A second fixed block radially fixedly coupled to the cover between the jaws, a slide block connected to the upper portion of the second fixed block so as to be slidable in a radial direction, A second support block including a second locator for positioning both sides of a lower end face of the cylindrical shaft coupling portion of the rear end to be positioned;
A hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator.
The hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator according to claim 1, wherein the outer circumferential surface of the head of the stud and the upper surface of the slide block front end of the second support block have the same inclination angle.
delete [2] The apparatus according to claim 1, wherein the jaw includes a first jaw for pressurizing the first locator of the first support block and a second jaw for pressurizing the first locator and the second locator of the second support block, A hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator, which is formed as a pair of axially pressurizing jaws for pressing while being in close contact with both sides of the outer circumferential surface of the cylindrical shaft coupling portion of the rear end.
The slide block of claim 1, wherein the slide block of the second support block is slidably coupled along a block guide groove formed in the second fixed block, A hydraulic chuck for rear end turning of a hydraulic cylinder for an excavator, wherein a spring is tumbled between a stopper coupled to a rear end of the fixed block.
The slide block according to claim 1, wherein a nut block is provided on the slide block so as to be movable in a radial direction, a second locator is coupled to the nut block, and the nut block is fixed to the slide block by a lock nut Hydraulic chuck for rear end turning of hydraulic cylinders for excavators.
The stapler according to claim 1, wherein the wedge plunger descends only to a height at which the head inclined surface of the stud is in surface-contact with the inclined surface formed at the end of the slide block of the second support block, Hydraulic chuck for rear end turning of hydraulic cylinder for excavator to descend to contact height.

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