JP2001040690A - Attaching structure of attachment in power shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust gaps created between an attachment, a link, and a pivot portion with a movable arm without removing a pin. SOLUTION: Upper ends of first and second links 5, 7 and a rotating means 10 are directed to the right and left, and one end portion sticks and contacts a side surface of either right or left at first or second links 5, 7 and pivoted in a rotatable manner by a pin 8 prohibited to pull out. At the other end portion of the pin 8, a cap-shaped pushing member 14 sticking and contacting to the side surface of the first and second links 5, 7 is secured with a bolt 15 through shims 17 inserted in a detachable manner between its inner end surface and the end surface of the pin 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment mounting structure for a power shovel when an attachment such as a bucket is rotatably connected to a tip end of a movable arm of the power shovel via a link.

[0002]

2. Description of the Related Art FIGS. 8 and 9 show a conventional bucket mounting structure, in which (1) is mounted on a front part of a self-propelled power shovel body in a bendable manner by a hydraulic cylinder (not shown). The movable arm, the tip of which is a bucket (2)
The base end (upper end) on the opening side is pivotally connected to the front and rear direction (the left side in FIG. 8 is the front side) by a base pin (3).

The lower ends of a pair of left and right upward first links (5) (5) are provided between a pair of left and right brackets (4) (4) fixed to the upper surface of the base end of the bucket (2). The part is pivotally connected by a pin (6) facing left and right.

As shown in FIG. 9, the proximal ends of the second links (7) and (7) are rotatably pivoted by pins (8) on the left and right sides of the front end of the movable arm (1). And the tip is
At the upper end of each of the first links (5), a pin pointing in the left-right direction
It is linked by (8).

[0005] A distal end of a piston rod (10) in a hydraulic cylinder is pivotally connected between the links (5) and (5).

The right second link (7) at the pin (8)
At the protruding end portion, a locking pin (11) passes through a pair of locking pieces (12) (12) fixed to the right side surface of the link (7) and each pin (8). Removably mounted, which allows both pins
(8) is retained.

[0007]

The connection between the first and second links (5) and (7) and the connection between the movable arm (1) and the second link (7) in the bucket (2). In addition to the large pressing force applied to the piston rod (10) of the hydraulic cylinder, the unbalanced load during excavation of the ground repeatedly acts, so that the sliding contact between the two links (5) and (7) and the piston rod (10) occurs. It is inevitable that the surfaces and the sliding surfaces of the movable arm (1) and the link (7) that are in contact with each other will be worn.

For this reason, when the wear has progressed to some extent and a large gap is generated, as shown in FIG. 9, a shim (13) is inserted between any of the contact surfaces of the above members. , The gap is adjusted.

In the conventional bucket (2) mounting structure described above, when inserting the shim (13), it is necessary to pull out the locking pin (11) and then completely pull out each pin (8). ,
The operation is complicated and a heavy effort is required for handling the heavy bucket (2).

The present invention has been made in view of the above problems, and has as its object to provide a mounting structure of an attachment for a power shovel, in which the gap can be easily adjusted without removing a pin. And

[0011]

According to the present invention, the above-mentioned problem is solved as follows. (1) A pair of left and right first links having a lower end pivotally attached to the upper end of the attachment at the appropriate position at the upper end of the attachment at the tip of the movable arm of the power shovel, and at the tip of the movable arm. In a power shovel, an upper end of a pair of left and right second links having a lower end pivotally connected to a rotating means so that an upper end of the attachment is attached to a movable arm so as to be rotatable in the front-rear direction. In the attachment mounting structure, the upper ends of the first and second links and the rotating means are oriented in the left-right direction, and one end of the first and second links is in contact with either the left or right side of the first or second link. A cap-shaped pusher, which is rotatably pivoted by the pin which is in contact with and is prevented from coming off, and has a side end face abutting against the side surface of the first or second link at the other end of the pin. Member, bolted through removably inserted shim between the inner end face and the pin end face of the.

(2) A pair of left and right first links having an upper end of the attachment pivotally attached to the tip of the movable arm of the power shovel and a lower end pivotally attached to the upper end of the attachment. The upper end of the pair of left and right second links having the lower end pivotally connected to the distal end is linked to a rotating means, so that the upper end of the attachment is attached to the movable arm so as to be rotatable in the front-rear direction. In the attachment mounting structure of the power shovel, the lower end of the second link and the movable arm are oriented in the left-right direction, and one end of the second link is in contact with one of the left and right side surfaces of the second link to be prevented from coming off. At the other end of the pin, a cap-shaped pressing member whose side end surface is in contact with the side surface of the second link is rotatably mounted by a pin. Bolted through removably inserted shim between the end face of the face and the pin.

(3) A pair of left and right first links having an upper end of the attachment pivotally attached to the tip of the movable arm of the power shovel and a lower end pivotally attached to the upper end of the attachment. The upper end of the pair of left and right second links having the lower end pivotally connected to the distal end is linked to a rotating means, so that the upper end of the attachment is attached to the movable arm so as to be rotatable in the front-rear direction. In an attachment mounting structure for a power shovel, a pair of left and right brackets capable of holding the distal end of a movable arm is erected at an appropriate position on the upper end of the attachment, and one end of the bracket is attached to the distal end of the movable arm. A pin abutted against the side surface of one of the left and right brackets and rotatably pivoted by a pin, and a side end portion is attached to the other end of the pin. A cap-shaped pressing member in which the end surface of the formed small-diameter cylindrical portion is in contact with the side end of the bush fitted into the pin insertion portion of the other bracket is detachable between the inner end surface and the end surface of the pin. Bolted through the inserted shim.

(4) In any one of the above items (1) to (3), a plurality of shims are inserted.

(5) In the above item (3) or (4), a shim having substantially the same thickness is detachably inserted between the opposing surfaces of the bracket and the pressing member.

(6) In any one of the above items (1) to (5), the first or second link and the bracket are provided with stoppers for preventing rotation of the pin.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The same members as those in the conventional example described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 1 to 4 show a first embodiment of the present invention, and show a cross-sectional plan view along line IX-IX in FIG. Each pin (8) is slightly shorter than the conventional one, and its tip protrudes slightly to the right through the second link (7) on the right, and the enlarged head ( 8a) abuts the side of the second link (7) on the left,
It is locked to the right.

A hollow cap-shaped pressing member (14) is detachably fitted to the protruding end of each pin (8), and both pressing members (14) are connected to the left ends of bolts (15) passing therethrough. To the right end of each pin (8), the pressing member (1) is inserted into the screw hole (16).
4) A plurality (three in this embodiment) of shims (17) are detachably inserted between the inside and the right end face of each pin (8), and screwed together.

At this time, the left end face of the pressing member (14)
The right side of the second link (7) is brought into contact with the right side of the second link (7) with such strength that no gap is formed in the contact portion of each member between the second links (7). I have.

A counterbore (18) for receiving the head of the bolt (15) is formed in the right end surface of the pressing member (14).
Is prevented from being damaged by contact with any object.

As shown in FIG. 2, each of the pins (8) has a planing surface (19) formed on the outer peripheral surface of the enlarged diameter head (8a) at the left end thereof and a second link (7) on the left. Stopper piece (20) fixed to the side of
, And is prevented from rotating around the axis.

In the above embodiment, as shown in FIG. 3, the contact surfaces of the respective members between the left and right second links (7) (7) are worn, and a gap is formed in the axial direction of each pin (8). When this occurs and reaches an acceptable limit, the gap is adjusted as follows.

First, the bolt (15) is loosened, the pressing member (14) is removed from the right end of each pin (8), and one shim (17) is removed. Then, as shown in FIG. 15) Attach the pressing member (14) to each pin (8).

Then, the interference of the pressing member (14) is changed to the shim 1
By increasing by the number of sheets, the left and right second links (7)
(7) is pressed by the enlarged head (8a) of the pin (8) and the pressing member (14), and moves slightly inward from the position shown in FIG.
The gap generated between the contact surfaces of the members between the two links (7) (7) is eliminated or reduced.

FIGS. 5 to 7 show a second embodiment of the present invention, in which a base end of a bucket (2), that is, a movable arm (1) (see a conventional example) and a bracket (4) are connected. The pivot point is shown longitudinally.

A movable arm is provided between the brackets (4) and (4).
The tip of (1) is pivotally connected to a pivot pin (3) so as to be freely rotatable.

The right end of the main shaft pin (3) is fitted between the outer peripheral surface and the inner peripheral surface of the right bracket (4) so as to be able to make a state road in the axial direction. The bush (21), which is slightly shorter than the long, is supported by the bush (21), and the left end surface of the enlarged diameter flange (21a) at the left end of the bush (21) is in contact with the right side surface of the movable arm (1).

At the right protruding end of the main shaft pin (3), a hollow cap-shaped pressing member (22) is attached to the front end of the small-diameter cylindrical portion (22a) formed at the left end thereof. ) And bracket
(4), and is detachably fitted to the outside so as to be loosely fitted.

The main shaft pin (3) and the pressing member (22) are connected to the left end of the bolt (15) penetrating the pressing member (22) by the main shaft pin (3).
The screw hole (16) is formed at the right end of the
It is connected by screwing through 7).

At the time of this connection, the left end face of the small diameter cylindrical portion (22a) of the pressing member (22) is connected to the right end face of the bush (21) between the left and right brackets (4) and the movable arm (1). It is in contact with moderate strength to the extent that no gap is created.

The outer peripheral surface of the small-diameter cylindrical portion (22a) between the opposing surfaces of the pressing member (22) and the bracket (4) has the same number as the shims (17) and the same thickness or a very small thickness. A plurality of shims (23) are fitted. (18) is a counterbore for preventing the bolt (15) from being damaged, and (20) is a stopper piece for preventing rotation of the base pin (3).

In the second embodiment, as shown in FIG. 6, for example, the contact surface between the left bracket (4) and the bush (21) of the movable arm (1) is worn, and
When a gap is formed in the axial direction of (3), the bolt (15) is loosened, the pressing member (22) is removed, the shims (17) and (23) are removed one by one, and then the pressing member (22) is removed again. 22) can be installed.

Then, the pressing member (22) moves to the left by one shim and pushes the bush (21) to the left, so that the movable arm (1) is moved as shown in FIG. Pressed to the left, the gap that has occurred is eliminated or reduced.

The right bracket (4) and the pressing member (2
Since the shim (23) is inserted between the bracket (2) and the bracket (4), the bending load from the movable arm (1) is applied to both brackets (4) because a gap is prevented from forming between them. Even if they do, the risk of them expanding outwards is reduced.

It should be noted that the second embodiment described above is applied to a bucket
The same applies to the pin (6) pivoting between (2) and the first link (5).

The present invention can of course be applied to the attachment of an attachment other than the bucket (2).

[0038]

According to the first to third aspects of the present invention, the first
And when a gap is generated between the contact surface between the second link and the rotating means, the contact surface between the second link and the movable arm, and the contact surface between the two brackets and the movable arm, only the pressing member is used. After removing and removing the shim, the gap can be easily adjusted simply by bolting the pressing member to each pin again. Therefore, there is no need to remove the pin and insert the shim as in the conventional case, and the workability is greatly improved. In addition, since the gap can be easily adjusted, the work is not performed for a long time while the gap is generated, and the amount of leakage of lubricating oil such as grease supplied to the pivot portion of the attachment is reduced. The consumption can be reduced, and the lubricating effect of the pivot portion is enhanced.

According to the fourth aspect of the present invention, the shim can be sequentially removed one by one as the gap becomes larger, and the shim can be adjusted one by one, so that the replacement life of the attachment, each link, and the movable arm can be extended.

According to the fifth aspect of the present invention, since there is no gap between the opposing surfaces of the bracket and the pressing member, even if a bending load from the movable arm acts on both brackets, they expand outward. Will not be done.

According to the sixth aspect of the present invention, since the pressing member bolted to each pin rotates together with the first or second link or the bracket, the bolt fixing the pressing member is provided. There is no risk of loosening.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a main part of a pivotal connection between first and second links and a movable arm according to a first embodiment of the present invention.

FIG. 2 is a left side view of a pivotal connection portion of first and second links in FIG. 1;

FIG. 3 is a cross-sectional plan view showing a state in which a gap is generated.

FIG. 4 is a cross-sectional plan view showing a state where a gap is adjusted.

FIG. 5 is a longitudinal sectional front view of a main part of a pivotal connection between a movable arm and a bracket of a bucket according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional front view showing a state in which a gap is generated.

FIG. 7 is a vertical sectional front view showing a state where a gap is adjusted.

FIG. 8 is a side view showing a conventional bucket mounting structure.

9 is an enlarged cross-sectional plan view taken along the line IX-IX of FIG. 8;

[Explanation of symbols]

 (1) movable arm (2) bucket (attachment) (3) base pin (4) bracket (5) first link (6) pin (7) second link (8) pin (8a) enlarged head (10) Piston rod (11) Locking pin (12) Locking piece (13) (17) (23) Shim (14) Pressing member (15) Bolt (16) Female thread hole (18) Counterbore hole (19 ) Plane cut surface (20) Stopper piece (21) Bush (21a) Large diameter flange (22) Pressing member (22a) Small diameter cylinder

Claims (6)

[Claims] An upper end of an attachment is pivotally attached to a tip of a movable arm of a power shovel, and a left and right link having a lower end pivotally attached to an upper end of the attachment, and a lower end is attached to a tip of the movable arm. By connecting the upper ends of the pair of left and right second links that are pivotally connected to the rotating means, the upper end of the attachment is attached to the movable arm so as to be rotatable in the front-rear direction. In the mounting structure, the upper ends of the first and second links and the rotating unit are turned in the left-right direction, and one end of the first and second links is in contact with one of the left and right side surfaces of the first or second link. A cap-like member rotatably pivoted by the pin that has been prevented from coming off, and having a side end face abutting against the side surface of the first or second link at the other end of the pin. The member mounting structure of the attachment in the power shovel, characterized in that the stop removably inserted bolts through the shim between the inner end face and the pin end face of the. 2. A pair of left and right first ends having a lower end pivotally attached to an upper end of the attachment at an end of a movable arm of a power shovel and an upper end of the attachment being pivotally attached to an upper end of the attachment.
And the upper end of a pair of left and right second links having a lower end pivotally connected to the distal end of the movable arm are linked to a rotating means so that the upper end of the attachment is moved in the front-rear direction to the movable arm. An attachment mounting structure for a power shovel, which is rotatably mounted on the second link, wherein a lower end of the second link and the movable arm are oriented in the left-right direction, and one end is located on one of right and left sides of the second link. A cap-shaped pressing member whose side end surface is in contact with the side surface of the second link is rotatably pivoted by a pin which has been prevented from coming off by contact with the inner end surface of the pin. A mounting structure for an attachment in a power shovel, wherein the attachment is bolted via a shim detachably inserted between the pin and an end face of the pin. 3. A pair of first and left and right first and second ends having a lower end pivotally connected to an upper end of the attachment at the tip of the movable arm of the power shovel and a lower end pivotally attached to the upper end of the attachment.
And the upper end of a pair of left and right second links having a lower end pivotally connected to the distal end of the movable arm are linked to a rotating means so that the upper end of the attachment is moved in the front-rear direction to the movable arm. In a mounting structure for an attachment of a power shovel, which is rotatably mounted on a pair of right and left brackets, a pair of right and left brackets into which the tip of a movable arm can be inserted is erected at an appropriate position at the upper end of the attachment. The tip is rotatably pivoted by a pin whose one end abuts against the side surface of one of the left and right brackets and is prevented from falling off, and is formed at the other end of the pin at the side end. A cap-shaped pressing member in which the end surface of the small-diameter cylindrical portion is in contact with the side end of the bush fitted to the pin insertion portion of the other bracket is formed by moving the inner end surface and the end surface of the pin. An attachment mounting structure for a power shovel, wherein the attachment is bolted via a shim detachably inserted therebetween. 4. The attachment mounting structure for an excavator according to claim 1, wherein a plurality of shims are inserted. 5. The attachment mounting structure for a power shovel according to claim 3, wherein a shim having substantially the same thickness is detachably inserted between opposing surfaces of the bracket and the pressing member. 6. The first or second link and the bracket are provided with a stopper for preventing rotation of the pin.
A mounting structure for an attachment in the power shovel according to any one of Claims 5 to 5.