KR20150093926A - Gripper for excavator - Google Patents

Abstract

The present invention relates to a gripper for an excavator, more specifically, which can be operated with only a main hydraulic cylinder without an auxiliary hydraulic cylinder. Compared to a conventional gripper, a fixing connection unit to fixedly connect a second gripper piece to a boom is easily installed and separated, and further, damage to a surface or the like of the boom is prevented in a process of installing the fixing connection unit. Moreover, various sizes of grippers are easily replaced and mounted on the boom to improve working efficiency.

Description

{GRIPPER FOR EXCAVATOR}

The present invention relates to a clamping device installed on a swinging platform of an excavator for removably moving an object such as a steel pipe or a stone, and more particularly to a clamping device capable of operating a clamping device without providing a hydraulic cylinder, The present invention relates to a technique for simplifying a detachable structure and facilitating maintenance and maintenance, and not only a welding process is required for installing a clamp, but also a clamp can be easily replaced and used in various sizes.

Generally, an excavator performs a work by installing a bucket or a forceps on the boom depending on the type of work. For example, when the work is carried out, buckets are installed on the boom, and when moving steel pipes or rocks Work is done with a separate tongue replaced at the boom.

Generally, a main hydraulic cylinder for basically rotating a bucket or the like is basically installed on a boom of an excavator. In order to operate a tongue and a shovel, a separate auxiliary hydraulic chamber is additionally provided in the boom.

That is, the first and second clamping pieces constituting the clamp by the main hydraulic cylinder and the auxiliary hydraulic cylinder are rotated at the same time so that the expansion and contraction of the clamp can be performed.

However, when the first and second clamping pieces are simultaneously rotated through the auxiliary hydraulic cylinder, the entire width of the clamping force increases. However, since this is independent of the force of lifting and moving the steel pipe, Is unnecessary.

In other words, since the tongs need to be widened to a proper level, there is no need for a simultaneous tilting structure of the first and second tongs.

In addition, since the auxiliary hydraulic cylinder is additionally provided in addition to the main hydraulic cylinder, the structure is complicated and the load applied to the boom is increased due to the weight of the auxiliary hydraulic cylinder.

Recently, in order to solve such a problem, there has been proposed a structure in which only the first clamping piece is rotated by the main hydraulic cylinder in a state in which the second clamping piece is fixed without installing the auxiliary hydraulic cylinder as in Korean Utility Model No. 0404947 .

More specifically, a guide member in the form of a hanger is fixedly installed on the rear side of the boom frame, and a guide shaft is provided on the second clamp unit, so that the second clamp unit is guided by the guide member It becomes a fixed state.

As the first clamp piece is rotated by the main hydraulic cylinder in the state where the second clamp piece is fixed, the opening and closing operations of the clamp are performed.

However, in this prior art, since the guide member is installed in a fixed state on the surface of the boom, there is a problem that the boom is damaged by inevitably welding or bolting to the boom in order to install the guide member.

In addition, since the guide member can not be installed in a complicated manner such as welding, the installation is difficult and cumbersome. In addition, when the guide member needs to be replaced due to breakage or the like, the replacement itself is very difficult.

In addition, since the guide member is fixedly installed on the guide member and the guide shaft of the second clamp member is worn on the guide member, when the guide member is replaced with a clamp which is larger or smaller than the clamp, do.

That is, the prior art is a structure in which it is not possible to replace the clamps of different sizes.

Korean Utility Model Registration No. 20-0404947 (December 26, 2005)

The present invention has been proposed in order to solve the problems of the prior art,

It is possible to easily install and detach the fixed connection part for fixing the second clamp piece to the boom frame in comparison with the conventional one, So that damage to the surface of a boom rope or the like is not caused at all during the installation process.

Also, it is an object of the present invention to provide a clamp device for an excavator that can easily replace workpieces of various sizes on a boom, thereby improving working efficiency.

To this end, various embodiments of the present invention,

A link shaft protruding from both sides of the boom frame,

Two first links each having one end connected to the link shaft so as to be rotatable and the other end connected to the cylinder rod, one end connected to the lower end of the boom frame so as to be rotatable and the other end connected to the cylinder rod, And a second link connected to the boom bar of the excavator,

Wherein one end is rotatably connected to the link shaft,

And a fastening member connected to the other end of the pivotal member and positioned in a shape transverse to the left and right widths of the rear surface of the boom frame, And a clamping part having a second clamping piece hinged to the first clamping piece and connected to the clamping fixing part, the lower clamping part having a lower end connected to the second clamping piece And a coupling guide member protruding upward from the coupling member and having an upper end inserted between the coupling member and the boom frame.

The first pivotal piece has one end rotatably connected to one side of the first link and one end of the link shaft is rotatably connected to the other end of the first link, And the fastening member can be connected to the first and second links with both ends thereof positioned between the first link and the other end of the second link.

In addition, the fastening member may be a rod having a predetermined length and both ends connected to the first and second links through a rotation shaft, and rotatable about the rotation axis.

The fastening guide member may have a plate shape and may have a length such that an upper end thereof protrudes upward in a state of passing through between the fastening member and the boom frame.

A plurality of first guide bars formed on the rear side of the boom frame at right and left intervals along the vertical length direction of the boom frame, and a plurality of second guide bars formed on a surface of the coupling guide member facing the rear surface of the boom frame, And a second guide bar inserted between the first guide bars.

In addition to this, a link shaft formed on both sides of the excavator boom is formed symmetrically on both sides of the boom frame, and two first links, one end of which is connected to the link shaft so as to be rotatable and the other end of which is connected to the cylinder rod And a second link connected at one end to a lower end portion of the boom frame so as to be rotatable and at the other end to the cylinder rod,

And an extension piece extending from an end portion connected to each link shaft of the first links, the extension piece being positioned between the extension pieces and having both ends connected to the extension pieces, A first clamping piece having one side thereof detachably coupled to the second link so as to be rotated together with the first clamping piece, and a second clamping piece having one side hinged to the first clamping piece and connected to the clamping fixture, And a coupling guide member protruding upward in a state where the lower end portion is connected to the second clamp piece and an upper end portion inserted between the coupling member and the rear side of the boom frame.

The present invention having these various embodiments,

Since only the first clamping member is rotated by the hydraulic cylinder in a state where the second clamping member is fixed by fastening between the clamping guide member and the clamping fixing unit, there is no need to additionally provide a separate hydraulic cylinder for the clamping unit, So that the weight load applied to the boom can be reduced.

Further, since the first and second turning pieces of the fastening fastening portion are provided to be fitted to the existing link shaft, unlike the prior art, there is no need to perform work such as welding for the fastening fastening portion, It is possible to easily perform the disassembly at the time of maintenance.

In addition, since the fastening members are simply connected to the first and second rotating pieces in an assembled manner, they can be easily separated and replaced during maintenance.

Since the fastening member is rod-like and rotatable between the first and second pivotal pieces, when the angle of the pivotal portion is changed in a state where the fastening member is sandwiched between the fastening member and the boom frame, The stress applied to the fastening guide member can be minimized, and breakage of the fastening guide member can be minimized.

Further, since the second clamping piece is connected and fixed to the clamping fixture in a state in which the clamping guide member in the form of a simple plate is sandwiched between the clamping member and the boom frame, even if the clamping members having different sizes are used, It is possible to replace the clamping unit of various sizes by using the clamping unit between the clamping unit and the clamping unit.

Since the first guide bar of the boom bar and the second guide bar of the joint guide member are engaged with each other when the joint guide member is sandwiched between the joint member and the boom bar, the shrinkage of the joint guide member is prevented, .

In addition, when one end of each first link is extended to form an elongated piece, and a fastening member is connected between the elongated pieces, if the fastening fastening portion is implemented, the first link can function as a first and a second rotating piece The structure can be further simplified.

1 is an exploded perspective view
Fig. 2 is a perspective view of the disassembled state of the clamping unit in a state where the fastening /
FIG. 3 is a cross-
Figure 4 is a cross-sectional view of the entire side of Figure 3
5 is a side sectional view showing a state in which the first clamp piece is rotated;
6 is a side sectional view in a state in which the first and second rotating pieces are omitted and the extended piece is formed on the first link

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

For reference, an excavator to which the present invention is applied has a known structure,

The hydraulic cylinder 2 is provided on the front side of the boom tower 1 as shown in FIGS. 1 and 2 and the second link 5 having the hook 4 at the lower end of the boom tower 1 One end of the connecting link 6 is rotatably connected to the other end of the second link 5 and the other end of the connecting link is connected to the cylinder rod 3 of the hydraulic cylinder 2 Connected structure.

In this state, a link shaft 7 is protruded from both sides of the lower end of the boom, and two first links 8 are positioned on the left and right sides of the boom frame 1, One end thereof is pierced by each link shaft 7 so as to be pivotable about the link shaft 7 and the other end thereof is connected to the other end of the link link 6. [

As shown in FIGS. 1 to 4, the clamp device of the present invention installed on the float 1 of the excavator has a structure in which the clamp fixing part 100, the clamp part 200, and the coupling guide member 300 .

First, the clamping fixture 100 clamps the second clamping piece 220 of the clamping unit 200, which will be described later,

And is composed of a rotating piece 110 and a fastening member 120 again.

The rotating piece 110 serves to connect the fastening and fixing unit 100 and the boom frame 1. The rotating piece 110 is divided into a first rotating piece 112 and a second rotating piece 114.

The first and second rotating pieces 112 and 114 are formed in the same plate shape and have a first coupling hole 115 for coupling with the link shaft 7 at one end and a first coupling hole 115 for coupling with the link shaft 7, And a second coupling hole 116 for coupling with the second electrode 120 is formed.

The first and second rotating pieces 112 and 114 are symmetrically disposed on both sides of the boom frame 1 and the sections between the first links 8 and the boom frame sides of the link shafts 7 are The other end of the second coupling hole 116 is positioned in the left-right symmetrical shape on the rear side of the boom frame.

As a result, the first and second rotating pieces 112 and 114 are vertically rotatable about the respective link shafts 7.

The installation process of the first and second rotating pieces 112 and 114 may be performed by simply disengaging the first and second rotating pieces 112 and 114 with the first links 8 separated from the link shafts 7 The link shaft 7 is inserted into the first coupling hole 115 and the first link 8 is coupled to the link shaft 7. [

Therefore, the first and second turning pieces 112 and 114 are prevented from being separated from the link shaft 7 by the respective first links 8.

The fastening member 120 constituting the fastening and fixing part 100 together with the first and second turning pieces 112 and 114 fastens the fastening fastening part 100 and the fastening guide member 300 to be described later, By having a fixed connection function of the clamp 220,

The first and second rotating pieces 112 and 114 are formed in a circular rod shape having an overall length and are positioned between the other ends of the first and second rotating pieces 112 and 114, 116, respectively.

Therefore, the fastening member 120 is rotatable about the second engaging hole 116 itself.

A separate rotary shaft 122 is fitted to both ends of the fastening member 120 through the second coupling holes 116 of the first and second rotary pieces 112 and 114 and is engaged with the head portion of the rotary shaft 122, A washer 124 is provided between the first and second rotating pieces 112 and 114 so that the coupling member 120 can not escape through the second coupling hole 116.

As described above, according to the present invention, since the fastening and fixing unit 100 for fastening between the grip unit 200 and the boom frame 1 is installed on the boom bar by the assembly method between the first and second turn pieces 112 and 114 and the link shaft 7 The mounting and dismounting of the fastening fixing part 100 is much easier than in the prior art in which the fastening fastening part is fixed to the boom stand by welding or the like.

In this way, the boom frame 1 provided with the fastening and fixing parts 100 is provided with the catches 200.

The gripper 200 serves to grip and move a steel pipe or a rock. The gripper 200 includes a first gripper piece 210 and a second gripper piece 220.

The first clamping piece 210 functions to open and close the clamping unit 200. The first clamping piece 212 and the second clamping piece 214 in the form of a fork are disposed at left and right intervals And the upper ends of the first and second gripping pieces 212 and 214 are connected to each other.

A first hooking shaft 215 and a second hooking shaft 216 are formed between the first gripping piece 212 and the upper side of the second gripping piece 214 for coupling with the hooking hole 1 Structure.

The second clamping piece 220 is formed with a first clamping piece 210 and a third clamping piece 222 and a fourth clamping piece 224 in symmetry with the first clamping piece 210, And the upper ends of the third gripping piece 222 and the fourth gripping piece 224 are connected to each other by the connecting plate 225. [

At this time, the uppermost end of the second clamping piece 220 and the uppermost end of the first clamping piece 210 are connected to each other through the hinge shaft 230 so that the first and second clamping pieces 210, 230 in a mutually symmetrical direction.

As the first and second hooking shafts 215 and 216 of the first clamping piece 210 are hooked on the hooking holes 4 of the second link 5 of the boom frame 1, (1).

The clamping unit 200 having such a configuration is provided with a clamping guide member 300. The clamping guide member 300 serves to fasten and fix the second clamping piece 220 of the clamping unit 200 to the clamping fixing unit 100. The clamping guiding member 300 has a plate shape with a predetermined length, And is protruded upward in a state where it is integrally connected to the connecting plate 225 of the base plate 220.

The width of the coupling guide member 300 may be less than the distance between the first and second turning pieces 112 and 114 so that the entire width of the rear side of the coupling guide member 300 can be brought into contact with the peripheral surface of the coupling member 120.

The length of the coupling guide member 300 is set to be long enough to allow the upper end of the coupling member 200 to be positioned above the coupling member 120 of the coupling and fixing unit 100 in a state where the clamp unit 200 is connected to the second link 5 do.

A plurality of first guide bars 310 are provided on the front surface of the coupling guide member 300 at left and right intervals to prevent unnecessary shaking when the coupling guide member 300 is fastened to the coupling and fixing unit 100 Respectively.

At this time, a plurality of second guide bars 320 are arranged at left and right intervals on the rear side of the boom bar 1.

The fastening guide member 300 can be fastened to the fastening member 120 of the fastening fastening part 100 in a state where the first fastening piece 210 is fastened to the second link as shown in FIGS. Is fastened to the fastening fixture (100) while being sandwiched between the rear side of the boom frame (1).

At this time, the upper end portion of the coupling guide member 300 is further projected upward in a state of passing through between the coupling member 120 and the boom frame.

In this state, the fastening member 120 is in a state of pushing the rear side by the weight of the first and second rotating pieces 112 and 114 along with its own weight.

As the coupling guide member 300 is sandwiched between the coupling member 120 and the boom frame so that the coupling member 120 is holding the coupling guide member 300, The clamping piece 220 is in a fixed position.

In this process, the first guide bars 310 are sandwiched between the second guide bars 320.

For reference, the first and second guide bars are elements for further preventing shaking of the coupling guide member, and may be omitted if there is no fear of shaking of the coupling guide member.

Hereinafter, the operation of the present invention based on such a configuration and the unique effects generated in the process will be described.

First, each first link 8 is separated from the link shaft 7 as shown in Fig. 1, and then the first and second rotating pieces 112, 114 Both ends of the fastening member 120 are inserted into the second fastening holes 116 with the fastening holes 115 interposed in the respective link shafts 7 and fastened with the rotary shaft 122.

Thereafter, fixing each of the first links 8 to the link shaft 7 completes the installation of the fastening fixation part 100.

As described above, according to the present invention, since the first and second turning pieces 112 and 114 are assembled and fitted to the link shaft 7 without welding or the like, And it is also possible to facilitate separation of the fastening fastener during maintenance.

In addition, since the work such as welding is not performed, a phenomenon that the surface of the float base 1 is not undesirably damaged in the process of installing the fastening fixing portion 100 is also prevented.

In this state, the boom frame 1 is moved in a state where the catch assembly 200 is placed on the ground, so that the coupling joint member 300 is sandwiched between the coupling member 120 and the rear surface of the boom frame 1 as shown in FIG. 3 .

The coupling member 120 is pushed by the coupling guide member 300 so as to be lifted upwards. At this time, the first and second returning pieces 112 and 114, The coupling guide member 300 is naturally raised by the thickness of the coupling guide member 300.

As the fastening member 120 is easily lifted up, the fastening member 120 can be smoothly fitted between the fastening member 120 and the rear surface of the boom rope 1 with ease.

In addition, since the fastening member 120 is rotatable as described above, the fastening member 120 is rotated by the friction with the fastening guide member 300 in the course of fitting the fastening guide member 300, (300) can be inserted more smoothly.

The first guide bar 310 of the coupling guide member 300 is inserted into the second guide bar 320 of the boom frame 1 in the process of fitting the coupling guide member 300 between the coupling member 120 and the boom frame, The insertion of the coupling guide member 300 is more stably guided.

When the coupling member 4 of the second link 5 is inserted into the first and second hooking shafts 215 of the first clamping piece 210 in the process of fastening the coupling- The entire clamping unit 200 is mounted on the end of the boom.

When the hydraulic cylinder 2 is operated after lifting the boom bar in this state, the first clamping piece 210 is rotated back and forth by the rotation of the second link 5, while the second clamping piece 220 is rotated by the clamping guide member 300 are held between the fastening member 120 and the boom frame so that they are held in a fixed state without back and forth shaking.

In this state, even when the boom frame is turned back and forth, the second clamp piece 220 is prevented from moving back and forth since the coupling guide member 300 is sandwiched between the coupling member 120 and the boom frame.

The second clamping piece 220 is inserted into the fastening structure of the first guide bar 310 and the second guide bar 320 in the course of the opening and closing operations of the clamping unit by the rotation of the first clamping piece 210 Thereby preventing a left / right rocking phenomenon.

As described above, according to the present invention, since the fastening and fixing part 100 for fastening the second fastening piece 220 to the boom frame is installed on the boom frame through a simple assembling structure, the fastening fastening part 100 can be easily installed Not only the phenomenon of damaging the boom pad surface during the installation process, but also the disassembly of the fastening fixture 100 can be easily performed, so that the maintenance is easy.

In addition to this structure, the second clamping piece 220 is simplified in its fastening structure as the clamping guide member 300 in the form of a plate is fastened to the clamping member in a form sandwiched between the clamping member and the boom frame. It is one of the other features.

Since the length of the fastening guide member 300 can be made sufficiently long to be fitted between the fastening member and the boom frame even when the forceps having different sizes are to be replaced, it is possible to replace the forceps of various sizes from time to time And this is also one of the characteristics of the present invention.

6 is a view showing a modification of the present invention, in which the first and second turning pieces 112 and 114 are omitted and each of the first links 8 is replaced with a function of the first and second coaxial portions There is a difference.

More specifically, of the first links 8, the end portion connected to the link shaft 7 is extended to the rear side to form the extending piece 400, and the fastening member 120 is positioned between the extending pieces 400 And then the both ends are connected to the extending pieces 400, thereby realizing the fastening fastening part 100.

In this state, the coupling guide member 300 of the second clamping piece 220 is inserted between the coupling member 120 and the boom frame. In this modified example, the first and second coaxial axes are omitted, so that the structure can be simplified as compared with the above embodiment.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. When the fastening guide member is fitted between the fastening members located between the first and second pivotal pieces and the boom frame, when the fastening fastening member is related to the structure and purpose of facilitating the installation and disassembly of the fastening fixture, It should be judged as belonging to the scope of protection.

1: Boom bar 2: Hydraulic cylinder
3: cylinder rod 4: hanger
5: second link 6: connection link
7: Link axis 8: First link
100: fastening fixture 110:
112: first rotating piece 114: second rotating piece
115: first engaging hole 116: second engaging hole
120: fastening member 122:
124: washer 200:
210: first clamp piece 212: first grip piece
214: second gripping piece 215: first hooking shaft
216: second hook shaft 220: second clamp
222: third gripping piece 224: fourth gripping piece
225: connecting plate 230: hinge shaft
300: fastening guide member 310: first guide bar
320: Second guide bar 400: Extension piece

Claims (5)

A link shaft protruding from both sides of the boom frame,
Two first links each having one end rotatably connected to the link shaft and the other end connected to the cylinder rod, one end rotatably connected to the lower end of the boom frame, and the other end connected to the cylinder rod And the second link is attached to and detached from the boom band of the excavator,
In a state where one end portion is rotatably connected to the link shaft
And a fastening member connected to the other end of the pivotal member and having a fastening member positioned in a shape transverse to the left and right widths of the back of the boom,
A first clamping piece having one side thereof detachably connected to the second link so as to be pivoted together and a second clamping piece having one side thereof hinged to the first clamping piece and connected to the clamping fixing part,
And a lower end portion protruding upward in a state where the lower end portion is connected to the second clamping piece and having an upper end inserted into the coupling member and the boom frame,
≪ / RTI >
The method of claim 1,
Wherein,
One end portion of the one link shaft is engaged in a section between the one side of the boom frame and one of the first links
And a second turning piece connected to the opposite side of the opposite link shaft so as to be rotatable in a section between the opposite side of the opposite side of the boom bar and the first link,
Including,
Wherein the fastening member is connected to the first and second links with both ends thereof being positioned between the first link and the other end of the second link
Cranes for excavators.
3. The method of claim 2,
Wherein the fastening member is a rod having a predetermined length and both ends thereof are connected to the first and second links via a rotary shaft,
Cranes for excavators.
The method of claim 1,
Wherein the fastening guide member is in the form of a plate and has an upper end projecting upwardly in a state of passing through between the fastening member and the boom frame
Cranes for excavators.
5. The method of claim 4,
A plurality of first guide bars formed at left and right intervals along the vertical direction of the boom stand on the rear side of the boom frame,
A second guide bar formed on a surface of the coupling guide member facing a rear surface of the boom frame and inserted between the first guide bars,
Further comprising:

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