JPH0679531B2 - Cutting machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a root cutting machine which is attached to the tip of a work machine boom such as a hydraulic power shovel and serves as a front attachment for cutting underground stems of trees.

Conventional technology When cutting trees and then clearing them, it is necessary to remove the stumps after cutting. Also, in plant development and the like, there are cases in which the rhizome of trees interferes with the construction of pipelines. In such a case, conventionally, the cutting of this rhizome is performed manually.

However, such work is usually carried out in a harsh natural environment, and the burden on the operator is heavy. Especially, in order to carry out the above work in wetlands and rivers, it is necessary to carry out setup work. However, the preparation will become extremely unclear and will significantly hinder the progress of the work.

A cutting edge for cutting a tree is supported by a support having a concave portion for receiving a tree and a support so as to be rotatable in the same plane about parallel rotating shafts located on both sides of the concave portion. And a floating double-acting hydraulic ram, with the end of one blade at the end of the piston of the floating double-acting hydraulic ram, and the end of the floating double-acting hydraulic ram. A tree cutting machine rotatably connected to the end of the other blade is proposed as Japanese Utility Model Publication No. 58-6279.

However, this one allows the floating double-acting hydraulic ram to move freely in the space between the rear plate and the triangular inner post,
Moreover, since the blades have a considerable weight, if the shear head unit is set upright so that the pair of blades are positioned vertically, the blades will rotate together with the floating double-acting hydraulic ram under the influence of gravity, There is a concern that the tip of the blade will move downward.

Therefore, the object to be cut is a rhizome, and it is difficult to apply it to a root cutting machine in which blades are often arranged to face each other depending on the position, angle, ground condition, etc. of the rhizome.

Problems to be Solved by the Invention An object of the present invention is to eliminate such inconveniences and to easily cut and remove the rhizome, thereby reducing the burden on the operator as much as possible and improving the efficiency of the operation. With
It is an object of the present invention to provide a cutting machine with good operability, which is not easily damaged because excessive stress is not applied to the mounting portion of the hydraulic cylinder and the cylinder body and the support.

Means for Solving the Problems The present invention provides a support body fixed to a mounting bracket attached to the boom tip of a working machine, and an intermediate portion pivotally attached to the support body to serve as a fulcrum and an acting portion. A pair of arms provided with detachable shearing blades at their tips, and rotatably attached to the support body in parallel with a plane including the arms, and a rotation center axis thereof passes through an intermediate point between fulcrums. Piston rods are provided at both ends of a cylinder body that is slidable on a line orthogonal to the line connecting the fulcrums, and the two piston rods extend and contract in synchronization, and the tips of the piston rods are the force points of each of the pair of arms. The above-mentioned problem was solved by a root cutting machine consisting of a two-rod hydraulic cylinder pivotally attached to the rear end of the cutting machine.

For work, such as a hydraulic power shovel, attach the felling machine to the tip of the boom with a mounting bracket, and use the boom of the implement to open the tip of the arm, which is the working part of the felling machine. Position the rhizome in the ground at a right angle so as to sandwich the rhizome.

Next, when hydraulic pressure is supplied from the hydraulic power source on the working machine to the two-rod hydraulic cylinder, the two piston rods provided on the two-rod hydraulic cylinder are extended in synchronization, and the rear ends of the pair of arms are respectively extended. When the arm is pressed, the arm rotates about each axis pivotally attached to the support as a fulcrum, the tip that acts as the action part is closed, and the rhizome is cut by each shear blade provided at the tip. .

One shear blade contacts the rhizome before the other shear blade,
If there is a difference in the amount of extension of the piston / rod, the 2-rod hydraulic cylinder will rotate, and the 2-rod hydraulic cylinder will always receive only an external force in the axial direction. It prevents damage to the pivot joint.

If the arms are arranged so that they face each other vertically when they are fully open, a moment acts to rotate the tip of the arm downward due to the influence of gravity, but the piston rod is not shortened any further and the center of rotation of the cylinder body Since the shaft does not move in the long axis direction of the cylinder body, the rotation of the hydraulic cylinder is suppressed, which prevents the arm from rotating.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1 (a), reference numerals 1 and 1 denote a pair of arms which are arranged to face each other, and support portions 1a and 1a provided in the middle portion of the arms 1 and 1 are connected via shafts 2 and 2, respectively. It is pivotally mounted between the supports 3, 3.

The supports 3, 3 are connected at a fixed interval, and the ends thereof are fixed to the connecting plate 4, and the connecting plate 4 is attached to the supporting plate 5 with bolts or the like. A mounting bracket 8 having mounting holes 6 and 7 is fixedly installed in the.

The mounting hole 6 of the mounting bracket 8 is pivotally attached to a boom tip of a working machine such as a hydraulic power shovel (not shown) through a pin, and the mounting hole 7 is a hydraulic cylinder installed on the boom of the working machine. It is pivotally attached to the end of the piston rod of the above through a pin, and the working angle of the support body 3,3, that is, the arm 1,1 is set by changing the protruding length due to the expansion and contraction of the piston rod. There is.

As shown in FIG. 2 showing the AA cross section of FIG. 1 (a), the back surface of the support body 3,3 passes through the midpoint of the shafts 2,2 and
Sliding member mounting grooves 3a, 3a orthogonal to the line connecting 2, 2 are provided, and sliding members 10, 10 are slidably mounted in the sliding member mounting grooves 3a, 3a.

The cylinder body of the two-rod hydraulic cylinder 9 that opens and closes the arms 1 and 1 has pins 11 and 1 fixed to the outer periphery of its central portion.
The two-rod hydraulic cylinder 9 is slidably and rotatably attached to the supports 3, 3 by trunnion coupling to the corresponding holes of the sliding members 10, 10 via 1.

Further, as shown in FIG. 1 (a), each piston rod 9a, 9a of the two-rod hydraulic cylinder 9 is pivotally attached to the rear end portion, which is a power point of the arm 1, 1 via pins 12, 12. The two-rod hydraulic cylinder 9 is supplied with pressure oil from a hydraulic power source on the working machine (not shown) by switching it through a hydraulic hose to move the piston rods 9a, 9a forward and backward in synchronization with each other. Open and close 1

Shear blades 13 and 13 are detachably attached to the action portions 1b and 1b of the arms 1 and 1 by bolts 14. Figure 1 (a) BB
As shown in FIG. 3 (a) showing a cross section, the bolt mounting portion of the action portion 1b is provided with a counterbore to embed the heads of the bolt and the nut, and the action portion 1b is also provided at various places. A notch 1c is provided as shown in FIG. 3 (b), which is a sectional view taken along the line CC of FIG. 1 (a).

Next, the operation of this embodiment will be described.

First, a felling machine is attached to the tip of a boom of a work machine such as a power shovel through a mounting bracket 8, and the boom of the work machine is operated to visually measure the center of the felling machine and the center of the rhizome in the vertical direction. Position them at a right angle to the longitudinal direction of the rhizome, and further, by operating the boom of the working machine, lower the root cutting machine while keeping the arms 1 and 1 open, and the arms 1 and 1 move to the rhizomes. Insert it into the ground to a position where you can hold it.

Next, when hydraulic pressure is supplied to the two-rod hydraulic cylinder 9 from the hydraulic supply source on the working machine, the two piston rods 9a, 9a provided on the two-rod hydraulic cylinder 9 are paid out synchronously, and the arm 1 , 1 are pressed against the rear end portions of the arms 1 and 1, and the arms 1 and 1 are pivoted to the supports 3 and 3, respectively.
Are rotated at the same angle with each other as a fulcrum, and the tip end, which is the action part, is closed and contacts the rhizome.

Even if one of the shear blades 13 comes into contact with the rhizome before the other of the shear blades 13 causes a difference in the amount of extension of the piston rods 9a, 9a, the two-rod hydraulic cylinder 9 has the pin 11, Since it is rotatably supported by the sliding members 10 and 10 via 11, the two-rod hydraulic cylinder 9 always receives only the external force in the axial direction by rotating about the pins 11 and 11. The sliding member will not be damaged.
No galling occurs between the 10, 10 and the sliding member mounting grooves 3a, 3a of the supports 3, 3.

Then, the piston rods 9a, 9a are further extended and the arms 1, 1 are closed until the shear blades 13, 13 attached to the action portions 1b, 1b of the arms 1, 1 come into contact with each other to cut the rhizome. .

Also, depending on the position of the rhizome, the angle, or the state of the ground, if the arms 1 and 1 are arranged so as to face each other vertically and sandwich the rhizome, the weight of the shear blades 13 and 13 causes the tip of the arms 1 and 1 to move downward. The moment to rotate it works. But,
When the arms 1 and 1 are fully opened, the piston rods 9a and 9a are fully retracted in the cylinder body, and the sliding member 10, which is the mounting portion of the two-rod hydraulic cylinder 9 and the supports 3 and 3, Since the 10 and the pins 11 and 11 fitted therein cannot be deviated from the sliding member mounting grooves 3a and 3a, the rotation of the two-rod hydraulic cylinder 9 is suppressed, and the tips of the arms 1 and 1 rotate downward. There is no such thing.

Furthermore, according to this embodiment, as shown in FIG. 3 (a), the bolt mounting portion of the action portion 1b of the arm 1 is provided with a counterbore to embed the heads of the bolt and nut. Therefore, even when the arm 1 is brought into contact with a high hardness object outside the rock, the shape of the bolt and the nut is not damaged, and the shear blade 13 can be reliably removed.

Further, as shown in FIG. 3 (b), the action portion 1b of the arm 1 is provided with the cutout portion 1c, so that galling, biting and rust occur between the arm 1 and the shearing blade 13. Even in the case where the shearing blade 13 is applied, a strong impact is applied to the shearing blade 13 in the direction of the arrow D in the drawing with a resin hammer or the like, so that the shearing blade 13 can be easily
Can be removed.

EFFECTS OF THE INVENTION According to the present invention, since it is possible to cut the underground rhizome, which has been performed manually by a working machine such as a hydraulic power shovel, the burden on the worker is reduced as much as possible and the work efficiency is improved. Can be improved.

Even if one shearing blade comes into contact with the rhizome before the other shearing blade and the piston and rod feeding amounts on both sides of the two-rod hydraulic cylinder differ, the two-rod hydraulic cylinder rotates. By doing so, only an external force in the axial direction is constantly received, and damage is prevented.

Furthermore, when setting the rhizomes with the arms fully opened, even if the arms are arranged so as to face each other in the vertical direction, the rotation of the hydraulic cylinder is suppressed, so the weight of the shear blade causes the arm to move. Since the tip side of the arm does not rotate downward to cause positional displacement and the arm itself does not freely rotate with respect to the support body, it can be easily arranged at an accurate position and has good operability. . As a result, working efficiency can be improved.

[Brief description of drawings]

FIG. 1 (a) is an external front view of an embodiment of the root cutting machine of the present invention, FIG. 1 (b) is an external side view of the same embodiment, and FIG. 1 (c) is the same embodiment. 2 is a local sectional view showing a 2-rod hydraulic cylinder mounting portion of the same embodiment, and FIGS. 3 (a) and 3 (b) are local sectional views of an arm acting portion of the same embodiment. 1 ... Arm, 1a ... Spindle part, 1b ... Working part, 1c ... Notch part, 2 ... Shaft, 3 ... Support, 3a ... Sliding member mounting groove, 4 ...
… Connecting plate, 5 …… Support plate, 6,7 …… Mounting hole, 8 …… Mounting bracket, 9 …… 2-rod hydraulic cylinder, 9a …… Piston / rod, 10 …… 5 moving member, 11 …… Pin, 12 …… Pin, 13 …… Shearing blade, 14 …… Bolt.

Claims (1)

[Claims] 1. A support body fixed to a mounting bracket,
A pair of arms having an intermediate portion pivotally attached to the support and serving as a fulcrum, and a detachable shearing blade provided at a tip end serving as an action portion, and the support being rotatably mounted in parallel with a plane including the arms. Piston rods are provided at both ends of a cylinder body whose rotation center axis is slidable on a line orthogonal to a line connecting the fulcrums through an intermediate point between the fulcrums, and the two piston rods are provided. And a two-rod hydraulic cylinder pivotally attached to the rear ends of the pair of arms, which extend and contract in synchronization with each other and serve as the power points of the pair of arms. The cutting machine used.