JP2000008409A - Piping structure of dozer working section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide piping structure of a dozer working section capable of excellently protecting an oil pipe connected to a tilt cylinder of a blade provided in a tilt rotatable manner and an angle rotatable manner and smoothly carrying out dozer working. SOLUTION: A dozer working section provides a bearing bracket 52 to a rising and falling arm 3 pivoted on a machine base 2, a blade 1 is pivoted on the bearing bracket 52 through a tilt shaft 50 and an angle shaft 51 and, at the same time, the blade 1 is provided in a tilt rotatable manner and an angle rotatable manner by a tilt cylinder 1S and angle cylinders 3L and 3R hydraulically operated from the machine base 2 side through an oil pipe. Then, the oil pipe 65 connected to the tilt cylinder 1S is inserted into the bearing bracket 52 along a rising and falling cylinder 3S to pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping structure for a dozer working section of a construction machine or the like.

[0002]

2. Description of the Related Art Conventionally, at the front of a machine of a power shovel,
A blade is pivotally supported via a tilt axis and an angle axis at the tip of an elevating arm supported by an elevating cylinder (blade cylinder) so as to be able to elevate and lower. A dozer working section is provided, in which pressure oil is sent from a hydraulic circuit on the machine base side to the tilt cylinder and the angle cylinder via a hydraulic hose so that the blade can be tilted and angled.

The pipe to the dozer is connected to a tilt cylinder installed on the side of the blade while fixing the oil pipe of the tilt cylinder along the upper surface of the lifting arm.

[0004]

However, in the conventional piping structure of the dozer working section, since the oil pipe of the tilt cylinder is fixed along the upper surface of the elevating arm, objects and debris come into contact with each other. A cover body for protecting the oil pipe is provided on one side of the lifting arm which is easy to be lifted. However, this cover body becomes long and the amount of fluctuation of the oil pipe at the time of blade tilt rotation is large. There is a problem that it is susceptible to damage due to contact with objects or the like near the ground due to damage due to damage.

[0005]

In order to solve the above-mentioned conventional problems, the piping structure of the dozer working part of the present invention is constituted by a support bracket 52 mounted on a lifting arm 3 supported on a machine base 2 by a lifting cylinder 3S. , The blade 1 is pivotally supported on the support bracket 52 via a tilt shaft 50 and an angle shaft 51, and the blade 1 is hydraulically operated from the machine base 2 side via an oil pipe, and a tilt cylinder 1S and an angle cylinder 3L, In the dozer working section provided so as to be tiltable and angle-rotatable by the 3R, an oil pipe 65 connected to the tilt cylinder 1S is provided along the lifting cylinder 3S, and is inserted through the support bracket 52 so as to be piped. It is characterized by doing.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. In FIG. 1, A indicates a main part of a power shovel shown as an embodiment of a construction work machine or the like, and a lifting arm 3 having a base end supported by a mounting shaft 20 at a front portion of a machine base 2 is mounted on a lifting cylinder. 3S, the blade 1 is supported at the tip of the lifting arm 3, and the angle of rotation and the tilt rotation are configured by a support structure 5 and a piping structure 6, which will be described later.

The blade 1 has a shape of an earth pressing plate having a rectangular shape in a front view similar to that of a conventional apparatus, and its left and right ends rotate up and down around a horizontal axis (tilt axis) 50 arranged in the front-rear direction. “Tilt rotation” and “angle rotation” in which the left and right ends rotate back and forth about the vertical axis (angle axis) 51
The tilt cylinder 1S and the left and right angle cylinders 3L and 3R are configured to perform expansion and contraction by hydraulic pressure.

A control section and an engine section (not shown) are arranged on the machine base 2 in front and rear, and a bracket for supporting a bucket working section is formed at the front end of the machine base 2. The operating section is provided with a bucket operating lever for operating the bucket working section on both sides of the seat, and an operating lever for operating the blade 1 is provided on the right side thereof. The generated pressure oil is used to operate various operation valves in the control unit so that each working unit can be freely operated.

The tilt cylinder 1S and the angle cylinders 3L, 3R are respectively attached to the lifting arm 3, and are also connected to an intermediate port (connection valve) connected to a center port 60 installed at the center of the machine base 2 by piping. ) 61,
Piping is performed by the piping structure 6 so as to perform expansion and contraction operations.

The support structure 5 for the blade 1 will be described. As shown in FIG. 2, a tilt shaft hole 5 into which the tilt shaft 50 (horizontal shaft) is inserted is provided at the center of the front end of the lifting arm 3.
0a and angle shaft hole 5 for insertion of angle shaft 51 (vertical axis)
1a, a support bracket 5 formed in a vertical direction and a horizontal direction.
2 are provided. A mounting bracket 10 (FIG. 1) having a mounting hole into which the tilt shaft 50 and the angle shaft 51 can be inserted is provided at a central portion behind the blade 1, and the tilt shaft hole 50a and the angle shaft hole 51a have the tilt shaft. The blade 1 and the angle shaft 51 are respectively inserted and assembled to pivotally support the blade 1 so as to be tiltable and angleable.

[0011] The blades 1 have the bases on both sides thereof at both sides of the elevating arm 3 with free joint shafts 30. The angle rotation of the left and right ends of the blade 1 around the angle shaft 51 is performed by the joint expansion and contraction operation of the angle cylinders 3L and 3R. The cylinder-side and piston-side ends of the tilt cylinder 1S are connected and supported by the left-side mounting shaft 11 and the angle shaft 51, and the blade 1 is moved around the tilt shaft 50 by the expansion and contraction operation of the tilt cylinder 1S. It is configured to perform tilt rotation that rotates up and down.

Next, the piping structure 6 of the dozer 1 will be described. Each of the angle cylinders 3L and 3R and the tilt cylinder 1S uses a backward-acting cylinder, and oil pipes (hydraulic hoses) connected to both sides of each cylinder are connected to the connection valve 61, respectively.

That is, the oil pipe 62 of the left angle cylinder 3L is directly connected to the connection valve 61, and the oil pipe 63 of the other angle cylinder 3R is connected to the lifting cylinder 3S.
Is connected to the connection valve 61 by bypassing the base side of the connection valve. 2 connecting the tilt cylinder 1S from the connection valve 61;
The oil pipe 65 is supported from the connection valve 61 along both sides of the elevating cylinder 3S. The upper part of the tilt cylinder 3S and the oil pipe 65 are covered with the cylinder cover 8, and the front side of the oil pipe 65 is further provided with an angle shaft 51. Is connected to the tilt cylinder 1S by being smoothly bent in a substantially right-angle direction at a position near.

In order to maintain the bending posture of the oil pipe 65 in the vicinity of the angle shaft 51 as described above, in this embodiment, a plurality of reinforcing partition walls 53 arranged in front and back of the support bracket 52 are provided. Between the angle shaft 51 and the tilt shaft 50, a support hole 55 through which two oil pipes 65 can be freely inserted is opened, and the two oil pipes 65 are inserted into the support holes 55 so as to be close to the angle shaft 51. After being gently bent, it is connected to the lower side of the tilt cylinder 1S along the back surface of the blade 1.

The cylinder cover 7 detachably attached to the tilt cylinder 1S is extended close to the tilt shaft 50 so as to cover the upper portion of the tilt cylinder 1S, thereby extending the oil pipe 65 behind the blade 1. Is covered with the support bracket 52 and the cylinder cover 7 so as not to be largely exposed.

The blade 1 provided with the support structure 5 and the piping structure 6 configured as described above is provided with an angle cylinder 3L,
By operating the 3R, the angle can be rotated to a desired angle about the angle shaft 51 to perform an angle operation, and by operating the tilt cylinder 1S, the tilt can be rotated to a desired angle about the tilt shaft 50. Since the tilt operation can be performed by doing so, the dozer operation can be performed smoothly.

At this time, the blade 1 supported so as to be capable of tilt rotation and angle rotation is provided with an oil pipe 65 connected to the tilt cylinder 1S along the lifting cylinder 3S, and is inserted through the support bracket 52. Since the pipe is provided, the oil pipe 65 is prevented from coming into contact with a contact object such as a vessel or earth and stone at the center of the lifting arm 3 and can be protected well.

Further, 2 connected to the tilt cylinder 1S
The oil pipe 65 is gently bent in the vicinity of the angle shaft 51 in a state of being inserted into the support hole 55 of the support bracket 52 so that the oil pipe 65 can be brought close to the back surface of the blade 1 and at the same time above the tilt cylinder 1S. The oil pipe 65 can be easily covered by the support bracket 52 and the cylinder cover 7 behind the blade 1.
, So as not to expose the blade 1 largely, so that the exposure on the back surface of the blade 1 can be suppressed and the contact with the contact object can be prevented.

Further, the tilt rotation can be performed by the minimum bending about the tilt shaft 50 at the front portion of the support bracket 52 without causing a large bending fluctuation of the oil pipe 65 at the time of tilting rotation as in the prior art. This can prevent the oil pipe 65 from being damaged.

[0020]

The present invention configured as described above has the following effects. The blade provided for tilting rotation and angle rotation is provided with an oil pipe connected to the tilt cylinder along the elevating cylinder, and is piped through the support bracket. In the central part of the garment, it is possible to prevent contact with an abutment such as a vessel or earth and stone, thereby providing good protection.

Further, the oil pipe is gently bent at a position near the angle axis or the tilt axis in a state of being inserted into the hole of the support bracket and is favorably supported and brought close to the back of the blade. Of the oil pipe can be suppressed, and the oil pipe can be rotated without causing a large deflection fluctuation of the oil pipe at the time of tilt rotation, thereby preventing the oil pipe from being deteriorated.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part and a piping structure of a power shovel.

FIG. 2 is an exploded perspective view showing a support structure and a piping structure of a dozer working unit.

[Explanation of symbols]

A power shovel (working machine) 1 blade 2 machine base 3 elevating arm 3S elevating cylinder 3L, 3R angle cylinder 5 support structure 6 piping structure 50 tilt shaft 51 angle shaft 52 support bracket 55 support hole 65 oil pipe (hydraulic hose)

Claims (1)

[Claims] 1. A support bracket (52) is provided on a lifting arm (3) supported on a machine base (2) by a lifting cylinder (3S) so as to be movable up and down, and a blade (1) is mounted on the support bracket (52).
The blade 1 is pivotally supported via the 0 and angle shafts 51, and the blade 1 is tiltably and angularly rotated by a tilt cylinder 1S and angle cylinders 3L, 3R which are hydraulically operated from the machine base 2 via an oil pipe. In the dozer working part provided, an oil pipe 65 connected to the tilt cylinder 1S is arranged along the lifting cylinder 3S, and is inserted through the support bracket 52 for piping. Piping structure.