JPH1018341A - Blade structure of blade work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform blade work in a good condition by using an auxiliary blade at the time of angle rotation work without obstructing blade work in a narrow and small place. SOLUTION: The width of a blade 1 constituted in such a manner that the blade 1 can turn centered on a longitudinal shaft on a central blade side through an ascent and descent arm 3 is formed to be narrower than running width of crawlers 2L, 2R on the right and left ahead of a running machine body 2 having the crawlers 2L, 2R on the right and left. An auxiliary blade is attached to a side end of the blade 1 in such a manner that it can be attached and detached freely, and the width of the auxiliary blade is formed to be the length at which it protrudes outward more than the running width when it is mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade structure mounted on a traveling work machine (blade work machine) such as a power shovel.

[0002]

2. Description of the Related Art Conventionally, a blade working machine in which a blade (earth pusher) is attached to a tip end of an elevating arm installed on a working machine such as a power shovel or a tractor moves the blade up and down by a hydraulic cylinder (tilt cylinder). In addition to supporting the blade so that it can be tilted in the direction, the angle rotation operation of the blade in the front-rear and left-right directions can be performed by connecting the blade and the elevating arm with a connecting rod having an adjustable length. Blade working machines are known.

In such a blade working machine, a blade installed in front of a crawler-type traveling device is provided on both sides of the left and right crawlers so that the aircraft can travel in a narrow place corresponding to the machine width. It is formed to have a width substantially similar to the end width (running width) or a width smaller than the width, and is attached.

[0004]

However, in the blade operation according to the above-described conventional structure, when the blade is rotated at an angle in the forward, backward, left, and right directions, the outer end on the opposite side of the blade is
Because it is rotated inward from the outer end of the crawler in that direction,
Blade leakage occurs in this part, and debris and snow during snow shaving will remain in this part in a swelling state, and the crawler on one side travels on this, so that the aircraft leans to the other side and the ground There is a problem that the blade work performed while excavating in a horizontal state cannot be performed.

[0005]

In order to solve the above-mentioned conventional problems, a blade structure of a blade working machine according to the present invention comprises:
In front of a traveling body 2 having left and right crawlers 2L and 2R, the blade 1 is configured to be rotatable in a plane back and forth around a vertical axis supporting a central portion of the blade via an elevating arm 3. In the working machine, the width of the blade 1 is formed to be narrower than the traveling width of the left and right crawlers 2L and 2R, and an auxiliary blade 10 is attached to a side end of the blade 1.
The auxiliary blade 10 is detachably attached, and the width of the auxiliary blade 10 is formed so as to protrude outward from the running width when the auxiliary blade 10 is mounted.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 shown in FIGS. 1 to 3 denotes a blade, which is attached to a front end of a lifting arm 3 supported by a lifting hydraulic cylinder 3a in front of a body 2 of a crawler traveling type power shovel (that is, a traveling work machine). The blade width B is equal to the left and right crawlers 2L and 2L.
Crawler width (ie, running width) H formed between the outside of R
It is formed to have a width approximately equal to or slightly smaller than this.

The blade 1 includes an auxiliary blade 10 to be described later, and a blade working machine having a conventional hydraulic tilt rotation configuration can be rotated at an angle by a retrofitting operation by a mechanism and a hydraulic circuit by a support bracket 5. It can be easily and inexpensively manufactured. The support bracket 5 is formed in an integral block shape on the back surface of the blade 1. The support bracket 5 is located at a lower portion of a wide receiving plate 50 provided at a front portion in a side view, and the bracket plates 51 and the upper and lower stages toward the rear. 52 is provided in a U-shaped cross section, and a support plate 53 is provided at the rear end of the upper bracket plate 51.

Then, pin holes are formed in the central portions and both sides of the bracket plates 51, 52, respectively, and the bracket plates 51, 52 are attached to mounting portions 3b, 3b (FIG. ), The mounting bracket (angle shaft) 5a (FIG. 2) is inserted into these mounting portions 3b, 3b in the vertical direction, so that the support bracket 5 is moved forward and backward with respect to the lifting arm 3 as shown by an arrow a. It is rotatably supported (hereinafter referred to as “angle rotation”).

Hydraulic cylinders (hereinafter referred to as angle cylinders) 3R, 3L (FIG. 3) pivotally mounted on both sides of the base of the elevating arm 3 between both sides of the bracket plates 51, 52 are fitted into the mounting pins 5b, When the two angle cylinders 3R and 3L are individually operated by being connected by 5b, the support bracket 5 rotates at an angle as indicated by an arrow a around the angle shaft 5a provided at the center. ing. The pistons of the angle cylinders 3R, 3L are provided at a high position of the lifting arm 3 between the crawlers 2L, 2R to protect them.

A tilt shaft 5c (FIGS. 3 and 5) is provided at a central portion below the receiving plate 50 so as to protrude in the front-rear direction.
By inserting a bearing portion 1a (FIG. 1) formed on the back surface of the blade 1 into the tilt shaft 5c, the blade 1 is rotated up and down around the tilt shaft 5c (right and left) as shown by an arrow b in FIG. (Referred to as “tilt rotation”).

As shown in FIG. 3, the other end of the tilt cylinder 1S pivotally mounted on the upper side of the blade 1 is provided with an operating pin 5d projecting forward from a central portion above the support plate 53. When the tilt cylinder 1S reciprocates, the blade 1 tilts around the tilt shaft 5c. On the other hand, as shown in FIG.
A mounting portion 3b (FIG. 1) on the upper side of the elevating arm 3 is inserted into the elongated hole 53a, and oil passages for the tilt cylinder 1S, the angle cylinders 3R and 3L are formed in the elongated holes 53a. The pipe to be formed is inserted.

Next, in FIG. 4, the tilt cylinder 1S,
A hydraulic circuit for operating the angle cylinders 3R and 3L will be described. Reference numeral 6 denotes a hydraulic pump composed of a main pump 6a and a pilot pump 6b.
Is a group of main valves installed in the abdomen of the upper swivel of the machine 2 for operating a main working device such as a bucket. On the side of the main valve group 7, an auxiliary valve 7H for operating an arbitrary attachment working device is provided as standard equipment by one.

In this embodiment, the auxiliary valve 7H
In a circuit for operating the tilt cylinder 1S via a rotary joint 8a similar to the conventional tilt specification formed in the lower oil passages 7a and 7b, two positions are provided between the rotary joint 8a and the tilt cylinder 1S. A switchable and inexpensive selector valve 80 can be retrofitted.

By switching the selector valve 80, the tilt cylinder 1S and the above-mentioned angle cylinders 3R and 3L which can be retrofitted can be operated separately. At this time, an oil passage (pipe) extending from the pair of ports of the selector valve 80
70, 71 are angle cylinders 3R, 3L, respectively.
The blades 1 are connected to a cylinder chamber which is rotated in the same direction so as to perform oil supply and oil discharge, and oil passages 70 and 71 are provided with bifurcated elbow pipes 7c and 7c as shown in FIGS. 7
In a state in which the oil passage 71a is connected to one of the angle cylinders 3L, the oil passages 71a and 71b branched therefrom are fixedly connected to the other angle cylinder 3R so that the oil passage 71a is formed in a simple pipe line form. , 71b so that the space formed between the receiving plate 50 and the support plate 53 of the support bracket 5 can be compactly traversed as a piping space 5k (FIGS. 2, 3).

The above-described oil passages 7a, 7b and 70, 71 extending forward from a selector valve 80 attached to a middle part of the inside of the lifting arm 3 are opened to the support plate 53 in a bundled state. Since the piping is passed through the piping space 5k through the elongated hole 53a (FIG. 3), the support bracket 5 can also serve as a protection member for the piping, and the mounting structure of the piping cover in this portion is not required. It can be easily performed using the plate 50 (FIG. 1) or a support plate.

The selector valve 80 may switch the operation positions of the tilt cylinder 1S and the angle cylinders 3R and 3L by a manual operation lever. In this embodiment, the pilot pump 6b is used to rotate the rotary joint 8a. A pilot oil passage 73 is provided in the spare port, and the selector valve 80 is efficiently switched by a stepping operation by a switching valve 75 provided on the driver's seat side. Reference numeral 60 denotes a return path for feeding oil from the selector valve 80 to the tank 61, which can also serve as a drain port of the rotary joint 8a.

The selector valve 80 has a simple construction of an oil passage by inserting and connecting a joint passage pipe for forming a pilot oil passage by a switching valve 75 to a conventional travel motor drain port (not shown). I have. Accordingly, the conventional blade working machine of the tilt rotation type can be used without adding a valve to the main valve group 7 or increasing the number of oil passages of the rotary joint 8a.
Can be simply and inexpensively configured so that the angle rotation can be performed.

Further, the above-mentioned configuration has a feature that the angle rotation mechanism can be easily modified and added by a retrofitting operation. Then, at the time of the tilt rotation operation of the blade, FIG.
The oil is supplied to the tilt cylinder 1S by operating the auxiliary valve 7H shown in (1), and the blade 1 is rotated around the tilt shaft 5c.
Tilt work can be performed.

If the operator wants to rotate the blade 1 at an angle, the selector valve 80 can be operated by operating the switching valve 75 from the driver's seat to easily switch the blade. Therefore, by operating the auxiliary valve 7H in this state, oil can be supplied to the angle cylinders 3R and 3L to rotate and maintain the blade 1 at a desired angle about the angle shaft 5a (FIG. 2). Work can be performed efficiently and well.

Next, referring to FIGS. 1 and 5, the auxiliary blade 1 will be described.
0 will be described. The auxiliary blade 10 is different from the blade 1 in the female screw portions 11a, 1 of the mounting portion 11 integrally formed on the back side on both outer sides of the blade 1.
A support plate 13 having a support arm 12 is attached to a mounting screw 13a.
Removably mounted via. A rectangular tubular mounting frame 15 provided on the back side of the auxiliary blade with respect to the support arm 12
Is slidably inserted from the side, and an adjusting screw 16 provided on the mounting frame 15 side is tightened to enable attachment / detachment and blade width adjustment.

When the auxiliary blade 10 is attached to the support arm 12 as described above, its blade surface 10
a is superimposed on the blade surface 1a of the blade 1 by a predetermined length, and the outer end of the auxiliary blade 10 protrudes from the outer ends of the crawlers 2L and 2R. As shown in the figure, the crawlers 2L (2R) are provided so as not to be inside the crawlers 2L (2R) even if they are turned in any direction.

Therefore, the blade structure according to the present invention, when performing blade work in a narrow place where the body is only wide enough to run, removes the auxiliary blade 10 and performs smooth blade work only with the blade 1. be able to. At the time of the angle rotation work, the auxiliary blades 10 can be attached to both ends of the blade 1 to make the auxiliary blade width L wider than the traveling width H, and the rotation direction of the blade 1 as shown by a chain line in FIG. At the front side of the crawlers 2L and 2R at least in front of the crawlers 2L and 2R without leaving the ground, so that the traveling of the crawlers is not hindered.

Further, the vehicle can travel while preventing the body from tilting, and the blade operation with high accuracy can be efficiently performed with a simple and highly rigid mounting structure. In order to further increase the blade width B, it is possible to loosen the adjusting screw 16 to move and adjust the auxiliary blade 10 outward within the range of the overlap margin.

The boom 9 having a bucket (not shown) mounted at the front end of the body 2 and having a distal end is provided with hydraulic piping in the present embodiment as follows. That is, the base of the boom 9 is rotatably supported by a mounting block 20 mounted on the body 2 via a support shaft 21, and a boom cylinder 90 is mounted between the mounting block 20 and the boom 9. Have been. Reference numeral 91 denotes an arm cylinder to which a bucket cylinder (not shown) is also attached.

Each of the cylinders 90, 91,... Is connected to a hydraulic control device (not shown) on the side of the machine body 2 and oil supply pipes 90p, 9
1p and an oil supply pipe 92p for a bucket cylinder are connected to each other to enable hydraulic control operation. Further, the base sides of the oil feed pipes 91p and 92p face upward when the boom 9 is attached to the connecting pipes 96 and 96 which are slidably supported by mounting holes 95 provided in the base of the boom 9. And the leading end side is taken out of the boom 9 from the outlet hole 9H and is piped. Therefore, the oil supply pipe 91
The boom 9 can prevent and protect the oil feed pipes 91p and 92p from external contact with the p and 92p being restrained from bending.

[0026]

The present invention configured as described above has the following effects. According to the invention of claim 1, the blade width can be formed to be narrower than the running width, and the blade width when the auxiliary blades are attached to both ends of the blade can be made larger than the running width. Does not interfere with blade work in place.

Further, by attaching auxiliary blades to both ends of the blade, it is possible to prevent the earth and stones leaking from the outer end of the auxiliary blade from remaining in the traveling width during the angle rotation work. The blade operation by the two methods can be performed easily and accurately.
In addition, the auxiliary blade can be mounted on the blade so as to have a protruding length that can be adjusted, so that the above-mentioned dual-purpose blade operation can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a blade working machine according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is a hydraulic circuit diagram of the blade working machine.

FIG. 5 is a rear view showing a mounting structure of an auxiliary blade mounted on the left side of the blade.

FIG. 6 is a side view of an auxiliary blade attached to the left side of the blade.

FIG. 7 is a plan view showing a relationship between a blade and an auxiliary blade.

FIG. 8 is a side view showing a boom mounting and piping structure.

FIG. 9 is a plan view showing a boom mounting and piping structure.

FIG. 10 is a sectional view of the boom base side.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Blade 1S Tilt cylinder 2 This machine 3 Lifting arm 3L, 3R Angle cylinder 5 Support bracket 5a Angle axis 5c Tilt axis 50 Receiving plate 53 Support plate 5k Piping space 6 Hydraulic pump 7 Main valve group 7H Auxiliary valve (tilt valve) 8a Rotary Joint 80 Selector valve 7a, 70, 71, 71a, 71b Oil passage 2L, 2R Crawler (traveling device) 10 Auxiliary blade 11 Mounting part 12 Support arm 13 Support plate 13a Mounting screw 15 Mounting frame 15a Adjusting screw

Claims (1)

[Claims] 1. In front of a traveling machine body 2 having left and right crawlers 2L and 2R, a blade 1 is rotatable in a plane back and forth around a longitudinal axis supporting a central portion of the blade via an elevating arm 3. In the blade working machine thus configured, the width of the blade 1 is formed narrower than the traveling width of the left and right crawlers 2L and 2R, and the auxiliary blade 10 is removably attached to the side end of the blade 1; The blade structure of a blade working machine, wherein the width of the auxiliary blade 10 is formed to protrude outward from the running width when the auxiliary blade 10 is mounted.