JP2001158593A - Tread fixing device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a tread of a construction machine easily and safely by making the tread of the machine body expansible and contractible. SOLUTION: A fixed link 41 is supported so that it can horizontally rotate by pivotally attaching one end part of the fixed link 41 to the outside surfaces of tread members 6L, 6R and either one of front or back guide holes 11L, 11R, and the other end part of the fixed link 41 is fixed to the other guide hole 11L or 11R by a pin. If the tread of a machine is expanded or contracted by extending or shrinking a retract cylinder 10 after the pin is pulled out, the fixed link 41 automatically rotates from either one of the guide holes 11L, 11R to the other with the slide of the tread members 6L, 6R relative to an axle beam 5, and after that, the other end part of the fixed link 41 is fixed to either position by the pin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tread fixing device for a construction machine, and more particularly to a tread fixing device for a construction machine in which a right and left tread members are slid by expansion and contraction of a retract cylinder to expand and contract a tread of the body. The present invention relates to a tread fixing device.

[0002]

2. Description of the Related Art Construction machines equipped with crawlers, such as crawler cranes and crawler backhoes, have a wide body tread in order to enhance stability during operation. When transporting the construction machine, it is necessary to reduce the tread of the body so that it can be loaded on a truck. For this reason, this type of construction machine is provided with a retract cylinder for expanding and contracting the tread of the body.

FIG. 6 shows a lower traveling body 1 of a conventional mobile crane. A lower frame 2 of the lower traveling body 1 has a cylindrical body 4 on which an upper revolving body 3 is pivotably mounted, and the cylindrical body 4. 4 and axle beams 5 and 5 fixed to the front and rear and extending in the left-right direction.
6R, and a driving sprocket 7 and a driven sprocket 8 are attached to the respective tread members 6L and 6R.
A crawler 9 is wound between the sprockets 7 and 8.

A retract cylinder 10 is attached to the lower portion of the cylindrical body 4 and both ends thereof are connected to left and right tread members 6L and 6R, respectively.
The two end portions of the axle beam 5 are inserted into guide holes 11L and 11R provided in the R, respectively, so as to be slidably supported, and the right and left tread members 6L, 6L,
6R is slid, and the tread of the fuselage is formed to be able to expand and contract.

[0005] Fixing lug plates 12L and 12R are fixed to the front and rear surfaces of the axle beams 5 and 5 at positions near both the left and right sides of the cylindrical body 4, and are fixed to the left and right tread members 6L and 6R. The lug plates 12L, 12R are provided on stopper arms 13L, 13R protruding from the side to the inside of the fuselage.
R is fixed by a pin 14.

[0006] When the tread of the body is reduced in order to load the construction machine on a truck, the operator goes under the upper revolving unit 3 after jacking up the body, and
For example, the pin 14 of the lug plate 12L on the left side of the machine is pulled out to release the fixing between the lug plate 12L and the stopper arm 13L. Next, by retracting the retract cylinder 10, the tread member 6L on the left side with respect to the axle beams 5 and 5 moves inside the body while sliding at the guide holes 11L and 11L. Thus, the tread on the left side of the fuselage is reduced, and the operator fixes the lug plate 12L and the stopper arm 13L at the reduced position with the pins 14. The tread on the right side of the fuselage is reduced in the same manner.

[0007] On the other hand, when the tread of the machine body is extended to bring the construction machine into a working posture after being transported to the site, the operator removes the pins 14 and removes the lugs 12L, 1L, as described above.
The fixation between the 2R and the stopper arms 13L, 13R is released, and then the retract cylinder 10 is extended to extend the tread of the body. After that, the worker again puts pin 1
4 and insert lug plates 12L, 12R and stopper arm 1
3L and 13R are fixed.

[0008]

As described above, the conventional tread fixing device of this type of construction machine is provided on the axle beams inside the left and right tread members. Had to dive under the revolving superstructure to remove and insert the pins. For this reason, when the operator performs the running operation of the machine body or the turning operation of the upper revolving unit while the operator is pulling out and inserting the pins, there is a risk that the operator is pinched by the machine.
Also, it is difficult to visually recognize the pin insertion state from outside the aircraft,
There is a possibility that the work for confirming the fixation of the tread becomes uncertain.

Therefore, in a construction machine in which the tread of the fuselage is formed so as to be able to expand and contract, there arises a technical problem to be solved so that the tread fixing operation can be performed easily and safely. The purpose is to solve this problem.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and is a lower frame constituting a lower traveling unit of a construction machine, wherein the lower frame pivots an upper revolving unit. A cylinder for mounting the cylinder, an axle beam fixed to the front and rear of the cylinder and extending in the left-right direction, and a tread member slidably mounted on both ends of the axle beam in the left-right direction. A retract cylinder is mounted on the cylindrical body, and both ends of the retract cylinder are connected to left and right tread members, and both ends of the axle beam are inserted into guide holes provided in the tread members and slidably supported. At the same time, the left and right tread members are slid with respect to the axle beam by the expansion and contraction operation of the retract cylinder, so that the tread of the body is formed to be expandable and contractable. In the machine, one end of a fixed link is pivotally attached to the outer surface of the tread member and one of the front and rear portions in the vicinity of the guide hole to support the fixed link so that the fixed link can rotate horizontally, and Is formed so as to be fixable to either one of the outer surface of the tread member and the front and rear portions in the vicinity of the guide hole, and the other end thereof. The connecting link is supported so as to be horizontally rotatable, and the base end of the connecting link is connected to the distal end of the axle beam. A tread fixing device for a construction machine, wherein the tread fixing device is configured to be fixed at any position.

[0011]

An embodiment of the present invention will be described below in detail with reference to the drawings. For convenience of explanation, the same components as those of the conventional technology are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 shows a crawler crane 20 as an example of a construction machine.
Is mounted so as to be pivotable in all horizontal directions. Upper revolving superstructure 3
A boom 21 is pivotally attached to the front of the upper revolving body, a cabin 22 is provided on the side thereof, and a gantry 23 is erected at the rear of the upper revolving unit 3 and a bail 24 is mounted. Further, one end of a boom pendant rope 25 is connected to the tip of the boom 21, and a bridle 26 is attached to the other end of the boom pendant rope 25.

The bail 24 and the bridle 26
A boom hoisting rope 27 is wound around each sheave (not shown), and the boom hoisting rope 27 is wound up and down by driving a boom winch 28 so that the boom 21 is raised and lowered. On the other hand, a guide sheave 29 and a top sheave 30 are pivotally attached to the tip end of the boom 21, and a hook rope 32 fed from a hook winch 31 is hung around the guide sheave 29 and the top sheave 30 to hang vertically. The hook 33 is attached to the tip of the rope 32.

FIG. 2 shows the undercarriage 1, in which the right side of the fuselage has a reduced tread and the left side has an expanded tread. In FIG. 1, both ends of axle beams 5 and 5 of lower frame 2 are inserted into guide holes 11L and 11R provided in left and right tread members 6L and 6R, and are slidably supported. The left and right tread members 6L, 6R are moved relative to the axle beams 5, 5 by the retracting operation of the retract cylinder 10 provided at the lower portion of the tread member.
Are formed so as to expand and contract the tread of the body by sliding.

As shown in FIGS. 2 and 3, the outer surface of the tread member 6L, 6R and the guide hole 11L,
The bracket 40 is fixed to one of the positions before and after the 11R near the one end portion 41a of the fixed link 41 to the bracket 40 pivotally mounted at pin P _1, so that the fixed link 41 is horizontally angularly movable To support. On the other hand, the outer surfaces of the tread members 6L, 6R and the guide holes 11L, 1
1R and either one of the front and rear positions and the other position, that is, the fixed link 41 rotates horizontally and the tread member 6
Brackets 42 and 43 are fixedly provided at positions substantially parallel to the outer surfaces of the L and 6R, and the other end 41b is fixed to the bracket 42 even if the fixed link 41 rotates in any direction. or 43 is formed so as to be connected by pins P ₂ in.

Further, the tip portion 45a of the connecting link 45 to an intermediate portion of the fixed link 41 to pivotally at pin P _3, together with the connecting link 45 is supported so as to be horizontally rotated, the connecting link A base end 45 b of the fork 45 is pivotally attached to a tip of the axle beam 5. The connecting link 45 is slightly bowed, and when the left and right tread members 6L and 6R slide with respect to the axle beam 5, the distal end portion 45a of the connecting link 45 pushes the intermediate portion of the fixed link 41. In order to pull the pin P ₁
, And horizontally rotates in a range of approximately 180 degrees in the front-rear direction.
Reference numeral 46 denotes a stopper provided on the brackets 42 and 43. The stopper 46 restricts the collision with the tread members 6L and 6R when the fixed link 41 rotates, and is provided with a pin hole at the other end 41b of the fixed link. and a pin hole of the bracket 42, 43 to match one that facilitates the insertion of the pin P ₂ in.

In order to load the crawler crane 20 on a truck and reduce the tread of the fuselage, after jacking up the fuselage, an operator, for example, pushes the pin P ₂ outside the left tread member 6L. To release the fixing between the fixed link 41 and the bracket 43. Next, by retracting the retract cylinder 10, the tread member 6L on the left side with respect to the axle beams 5 and 5 moves inside the body while sliding at the guide holes 11L and 11L.

At this time, with the inner movement of the tread member 6L, as shown in FIG. 4, the fixed link 41 is pushed outward by the connecting link 45 and horizontally rotates from one side of the guide hole 11L to the other side. Furthermore, retract cylinder 1
0 is contracted, as shown in FIG.
L moves further inward, and the fixed link 41 rotates to a position substantially 180 degrees opposite to the position in FIG. The inner movement of the tread member 6L is restricted by a stopper 47 fixed to the axle beam 5. Then, when inserting the pin P ₂ after to match the pin hole of the pin hole and the bracket 42 of the other end portion 41b of the fixed link, the fixed link 4
1 and the movement of the connecting link 45 are fixed, so that the axle beam 5 cannot be moved, and the tread of the body is fixed in a contracted state.

On the other hand, when expanding the tread of the machine so as to bring the crawler crane 20 into the working posture, an operation reverse to that described above is performed. That is, after jacking up the machine, the worker may, for example, use the left tread member 6L shown in FIG.
To unlock the at outer and the pin P ₂ fixed link 41 is pulled out of the bracket 43. Next, by extending the retract cylinder 10, the left tread member 6L with respect to the axle beams 5 and 5 moves to the outside of the body while sliding at the guide holes 11L and 11L. In that case, as shown in FIG. 4, the fixed link 41 is pulled inward by the connecting link 45, and horizontally rotates from the other side of the guide hole 11L to the opposite side.

Further, when the retract cylinder 10 is extended, as shown in FIG. 3, the tread member 6L moves further outward, and the fixed link 41 rotates to a position on the opposite side by approximately 180 degrees. And the other end 41 of the fixed link
If the pin hole and the pin insertion by matching the pins P ₂ and the hole of the bracket 43 of b, the the movement of the pinned links 41 and connecting link 45 can not move the axle beam 5, the tread of the aircraft Fixed in expanded state.

[0020] Since the fixed link 41 with the expansion and contraction of the retraction cylinder 10 is horizontally rotating back and forth, it can be fixed and released tread only by insertion and removal of the pin P ₂ easily. If it is desired to perform the rotation operation of the fixed link 41 independently of the retracting operation of the retract cylinder 10, the distal end 45 of the connecting link is required.
By keeping remove the pin P ₃ of a, it is possible to prevent the fixed link 41 when the tread scaling rotates.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0022]

As described in detail in the above embodiment, the present invention expands and contracts the tread of the fuselage by sliding the left and right tread members with respect to the axle beam of the lower frame by the retracting operation of the retract cylinder. In the construction machine formed so as to be capable, a fixed link is horizontally rotatably provided at any position before and after the outer surface of the guide hole of the tread member, and the fixed link and the tip of the axle beam are connected by a connection link. Thereby, the fixed link is automatically horizontally rotated with the expansion and contraction of the tread and automatically horizontally rotated from one of the front and rear of the guide hole to the other position.
The tread can be fixed very easily by inserting pins at each position.

[0023] Since the pin insertion / removal operation is performed outside the tread member, there is a danger that the operator will be pinched by the machine even if the operator erroneously performs the traveling device or turning operation of the body during the pin insertion / removal operation. Safety can be ensured. Further, since the pin insertion state can be easily visually recognized from the outside of the machine body, the tread can be securely confirmed to be fixed.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a side view of a crawler crane.

FIG. 2 shows a lower traveling body of a crawler crane, (a)
Is a partially cutaway plan view, (b) is a side view, and (c) is a partially cutaway rear view.

FIGS. 3A and 3B show the operation of a fixed link and a connecting link in a state where a tread is expanded, and FIG.
(B) is a side view.

FIGS. 4A and 4B show the operation of a fixed link and a connecting link in a state in which a tread is in an intermediate state between expansion and contraction, where FIG.

5A and 5B show the operation of the fixed link and the connecting link in a state where the tread is reduced, and FIG.
(B) is a side view.

FIG. 6 shows a lower traveling body of a conventional crawler crane;
(A) is a partially cutaway plan view, (b) is a side view, and (c) is a rear view.

[Explanation of symbols]

1 undercarriage 2 Lower frame 3 upper rotating body 4 cylinder 5 axle beam 6L, 6R tread member 10 retracting cylinder 11L, 11R guide hole 20 cranes 40, 42, 43 bracket 41 fixed link 45 connecting link P _1, P ₂ , P ₃ pin

Claims (1)

[Claims] 1. A lower frame constituting a lower traveling body of a construction machine, wherein the lower frame is provided with a cylindrical body on which an upper revolving body is pivotably mounted, and fixedly provided before and after the cylindrical body. An axle beam extending in the left-right direction, and a tread member slidably mounted on both ends of the axle beam in the left-right direction. The axle beam is inserted into the guide holes provided in the tread member and slidably supported by being connected to the tread member. In the construction machine in which the tread of the fuselage is formed so as to be able to expand and contract, any one of the front and rear of the outer surface of the tread member and the vicinity of the guide hole is provided. And one end of the fixed link is pivotally mounted to support the fixed link so that the fixed link can be rotated horizontally, and the other end of the fixed link is located at one of the outer surface of the tread member and the front or rear near the guide hole. It is formed so as to be fixable to both one and the other, and furthermore, the front end of the connection link is pivotally attached to the intermediate portion of the fixed link to support the connection link so that it can rotate horizontally. A construction machine wherein a base end is connected to a front end of the axle beam, and the fixed link is horizontally rotated and fixed at one of front and rear positions as the tread of the body is expanded or contracted. Tread fixing device.