JPH08120706A - Dozer device for construction machine having upper turning unit - Google Patents

Abstract

PURPOSE: To provide profitable points of spreading a range of digging this side, spreading a range of running on a sloping road or the like, stabilizing a function as an outrigger, etc., by extensibly/contractibly forming a liftably arranged blade plate. CONSTITUTION: In a dozer device for a construction machine having an upper turning unit 4, a blade plate 2, liftably arranged in the front side of a lower running unit 3, is made extensible/contractible by using a hydraulic cylinder 12. Then in the case of performing digging work in the vicinity of a crawler belt 7 by a bucket 5, when the blade plate 2 is placed in the most contracted condition, a range of work, which can be performed without reversing a car body, is spread. Further in a condition of lifting the blade plate 2, also in the case of running on a sloping road and of riding across an obstacle, when the blade plate 2 is placed in the most contracted condition, a running capable range is spread. On the other hand, when the blade plate 2 is placed in an extended condition, a work range of the blade plate 2 is spread, and a grounding part is extended as an outrigger, to obtain a stable function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dozer device in which a vertically movable blade plate is arranged in front of a lower traveling body in a construction machine having an upper revolving body such as a hydraulic excavator.

[0002]

2. Description of the Related Art A dozer device is naturally attached to a construction machine such as a bulldozer. However, even in a construction machine having an upper revolving structure such as a hydraulic excavator, the dozer device is located in front of the lower traveling structure. Some dozer devices are applied to.

FIG. 4 is a side view showing an example of a hydraulic excavator with a dozer device.

A base frame 30 on the front side of the undercarriage 3.
Two arms 1'on the left and right, which are swingably attached via pins 33, are connected to the end portions at right angles to the blade plate 2 arranged further forward, to form a dozer frame. There is. Above the arm 1 ', the front end is the arm 1'
A bracket 1a on the upper surface is provided with a lifting cylinder 6 whose rear end is pin-connected to the bracket 32 of the base frame 30, and the blade plate 2 is lifted and lowered by the expansion and contraction of the cylinder 6.

With this dozer device, the operator adjusts the height of the lower end of the blade plate 2 with respect to the ground, and pushes the earth and sand on the front surface of the blade plate 2 by the traveling driving force of the hydraulic excavator to backfill the groove excavated by the bucket 5. Can be done. When excavating with the bucket 5 or the like, if the blade plate 2 is grounded and stepped on the side in the excavation direction, the excavation reaction force is received by the blade plate 2, so that a function as an outrigger that stabilizes the vehicle body is also obtained.

[0006]

However, in the construction machine as described above, the crawler belt 7 is provided due to the existence of the blade plate 2.
For the most recent work such as excavation, there is an inconvenience of having to move backward along with the vehicle body, and there is a problem in terms of so-called front excavation.
Further, when moving forward and backward, it is necessary to hold the blade plate 2 in a raised state, but there is a limit to the rising position of the blade plate 2, so the blade plate 2 may be caught depending on a slope or an obstacle, Therefore, there was a limit in running. In addition, when functioning as an outrigger during excavation,
Since the distance to the blade plate 2 is fixed, the position of the outrigger is also fixed, and there is a limit to the work for stable excavation.

The present invention solves the above-mentioned problems peculiar to the construction machine having the dozer device among the construction machines having the upper revolving structure, and also brings about other useful effects. The present invention aims to provide a dozer device that can be used.

[0008]

Therefore, a dozer device for a construction machine having an upper swing body according to the present invention is a dozer device in which a blade plate is vertically movable in front of a lower traveling body. It is characterized by being able to expand and contract.

Here, the blade plate expanding / contracting mechanism may be embodied by the following structure in addition to the conventionally known means such as an example hydraulic cylinder.

For example, as shown in FIG. 3, the blade plate supporting arm 1 is slidable with respect to each other, and has an outer cylindrical body 13 in which one or more pin holes 15 are formed along the longitudinal direction (in the figure, 1 pin hole 15) and insert 14 (in the figure, there are multiple pin holes 15)
And a pin 16 is inserted into the pin hole 15 at a predetermined position where the outer cylindrical body 13 and the pin hole 15 of the inner insertion body 14 overlap with each other, and the blade plate supporting arm 1 is expanded and contracted by fixing the pin 16 at the predetermined position. It is free.

[0011]

When performing the excavation work in the vicinity of the crawler belt with the bucket, which is the working unit, the range of the work that can be performed without moving the vehicle body backward is expanded by setting the blade plate to the most contracted state. For example, FIG. 1 shows one embodiment of the present invention described later, but when the position of the solid line in the drawing is the position of the conventional blade plate, the blade plate 2 is reduced from that position to the position of the one-dot chain line by the configuration of the present invention. If possible, the front moat can be performed without moving the vehicle body by the reduced distance C.

Even when traveling on a slope or with an obstacle overriding while the blade plate is raised, the travelable range is expanded by setting the blade plate to the most contracted state. To explain with reference to FIG. 1, when the blade plate 2 is at the maximum rise, the one-dot chain line showing the position of the blade plate 2 at the time of the maximum contraction is larger than the normal state of the solid line and the extended state of the two-dot chain line. The maximum blade separation angle θ formed by the lower end of the blade and the horizon line. That is, as the blade separation angle increases, the range in which the lower end of the blade plate 2 is caught decreases, and the range in which the vehicle can travel over slopes and over obstacles is expanded.

If the blade plate is grounded in the extended state, it functions as a more stable outrigger during excavation or suspension work of the upper revolving structure working part, and more powerful excavation work or more powerful lifting work is performed in the work part. You can do it.

When the blade plate is extended, the range of elevation of the blade plate is expanded and the working range of the blade plate itself is expanded. That is, in FIG. 1, at the position indicated by the chain double-dashed line indicating the maximum extension of the blade plate 2, the maximum amount of rise A and the maximum amount of fall B of the blade plate 2 are naturally larger than those in the normal state of the solid line. The working range of the blade plate is expanded.

Further, the blade plate can be expanded / contracted in addition to ascending / descending, and the range of joint work with the upper revolving structure working section is widened, for example, the range in which objects are moved together with the bucket is expanded. .

Of course, since the blade plate is expandable and contractable, backfilling work can be performed without moving the vehicle body, and the workability of excavating the blade plate itself is improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of a dozer device according to the present invention will be described with reference to the drawings. 1 is a side view showing an example in which the present invention is applied to a hydraulic excavator, and FIG. 2 is a side view showing a main part of a dozer device in the previous figure. In the figure, 1 is an arm for supporting a blade plate, 2 is a blade plate, 3 is a lower traveling body, 4 is an upper revolving structure, 5 is a bucket forming a working portion, 30 is a base frame, and 31 is a track frame.

The dozer device is located in front of the lower traveling body 3 and has a frame composed of a blade plate supporting arm 1 and a blade plate 2 connected to the tip thereof.

The blade plate supporting arm 1 is composed of an outer cylindrical body 10 and an inner cylindrical body 11 which slide with each other, and an end portion of the outer cylindrical body 10 is provided with a pin at the front end bracket 32 of the base frame of the lower traveling body 3. The end portions of the inner cylinder 11 are connected to the blade plate 2, respectively. A hydraulic cylinder 12 for expansion and contraction is arranged inside the inner tubular body 11, and the end portion of the piston rod 12a is the blade plate 2.
Further, the cylinder outer cylinders 12b are connected to the outer cylinder bodies 10, respectively, and the cylinder action causes the outer cylinder body 10 and the inner cylinder body 11 to slide to cause the blade plate 2 to expand and contract.

A hydraulic cylinder 6 for raising and lowering is arranged above the blade plate supporting arm 1, the end portion of the piston rod 6a of which is the upper bracket of the outer cylinder body 10 and the end portion of the cylinder outer cylinder 6b is the base frame front end bracket 32. And the outer cylinder body 10 is swung up and down by the cylinder action, and the blade plate 2 is moved up and down.

Since this embodiment is constructed as described above,
The following effects can be obtained.

When the bucket 5 is used for excavation work in the vicinity of the crawler belt 7, if the blade plate 2 is in the most contracted state, the range of work that can be performed without moving the vehicle body backward is expanded. In this embodiment,
The position of the solid line is set as the position of the conventional blade plate 2, but if the blade plate 2 is reduced from that position to the position of the alternate long and short dash line, the front moat without moving the vehicle body by the distance C corresponding to the reduction. Is possible.

Even when the vehicle is traveling on a slope with the blade plate 2 raised or when traveling over an obstacle, the travelable range is expanded by setting the blade plate 2 to the minimum contraction state. That is,
At the time of the alternate long and short dash line showing the position of the blade plate 2 at the minimum contraction,
The blade separation angle θ formed by the lower end and the horizon at the time of maximum rise of the blade plate 2 becomes larger than the position at the time of the solid line which is the conventional set position, and the range of catching the lower end of the blade plate 2 is reduced by the increase. , The range of riding over slopes and obstacles will be expanded.

If the blade plate 2 is grounded in the most extended state shown by the chain double-dashed line, the grounding point as an outrigger is extended compared to the conventional grounding position at the solid line, and when the bucket 5 is excavated, as a more stable outrigger. It works and can perform more powerful excavation work.

If the blade plate 2 is further extended,
The lifting range of the blade plate 2 is expanded, and the working range of the blade plate itself is also expanded. That is, at the position indicated by the chain double-dashed line, which indicates the maximum extension of the blade plate 2, the maximum lift amount A and the maximum fall amount B of the blade plate 2 are naturally larger than those in the normal state, and the work of the blade plate 2 is accordingly increased. The range is expanded.

In addition, since the blade plate 2 can be expanded and contracted in addition to moving up and down, the range of joint work with the front structure can be expanded, for example, the range in which objects can be moved together with the bucket 5 can be expanded. spread. Of course, blade plate 2
Is expandable and contractible, so that the backfilling work can be performed without moving the vehicle body, and the workability of excavating the blade plate 2 itself is also improved.

The present invention is not limited to the above embodiment, and naturally the expansion / contraction mechanism of the blade plate may be configured as shown in FIG. 3, for example. Of course, Figure 3
Even in the above configuration, the blade plate 2 can be freely expanded and contracted by the sliding operation between the outer cylinder body 13 and the inner insertion body 14 and the fixing of the pin 16 at a predetermined position, and the same effect as the above embodiment can be obtained. In the case of this configuration, since no hydraulic system member is used, there is an advantage in terms of manufacturing and operation costs.

[0028]

According to the dozer device for a construction machine having the upper swing body according to the present invention, the range of the front moat which can be performed without moving the vehicle body can be expanded and the dozer device for a slope road can be expanded as compared with the conventional structure. The traveling range over obstacles can also be expanded. Further, the blade plate can be made to function as a more stable outrigger. In addition, the range of joint work with the upper revolving structure working unit is expanded, and of course, the workability of the blade plate itself is improved.

[Brief description of drawings]

FIG. 1 is a side view showing an example in which the present invention is applied to a hydraulic excavator.

FIG. 2 is a side view showing a main part of the dozer device in the previous figure.

FIG. 3 shows a main part of another example of the present invention, in which (a) is a side view thereof and (b) is a partial perspective view thereof.

FIG. 4 is a side view showing a conventional dozer device for a construction machine having an upper swing body.

[Explanation of symbols]

 1 Blade Plate Support Arm 2 Blade Plate 3 Lower Traveling Body 4 Upper Revolving Body 5 Bucket 6 Lifting Hydraulic Cylinder 12 Telescopic Hydraulic Cylinder

Claims (3)

[Claims] 1. A dozer device for a construction machine having an upper revolving structure, wherein a blade plate is arranged on the front side of a lower traveling body so as to be able to move up and down. 2. A construction machine dozer apparatus having an upper revolving structure according to claim 1, wherein the blade plate is extendable / contractible by using a hydraulic cylinder. Dozer device. 3. A construction machine dozer apparatus having an upper revolving structure according to claim 1, wherein the blade plate supporting arms are slidable with respect to each other, and one or more pin holes are formed along the longitudinal direction. 2. The upper revolving structure according to claim 1, wherein the upper revolving structure comprises an outer cylindrical body and an inner insertion body, and a pin is inserted into the pin hole at a predetermined position where the pin holes of the outer cylindrical body and the inner insertion body overlap. Dozer equipment for construction machinery.