JPH0633415A - Blade support mechanism for concrete cutter - Google Patents

Abstract

PURPOSE:To reduce the overall length of a concrete cutter machine body, to enable mounting of a large blade though the size is small, to increase the cutting depth, to enable execution of cutting by means of the front face of a blade, and also to facilitate cutting of a block wall by a method wherein the blade is arranged in an overhanging state to one side of the machine body and the pivotal support part of a lift arm is arranged in a spot positioned as near a ground as possible. CONSTITUTION:A lift arm 9 is pivotally supported through a pivotal support part 3 to the rear part of a main frame 2 on which an engine E is mounted. The blade 1 is vertically rotatable between a position under a ground and a position above a ground in a way that a blade 1 is supported by the front of the lift arm 9 and the lift arm 9 is vertically rotated around the pivotal support part 3. The pivotal support part 3 is arranged at the lower part of a machine body, the lower part being situated in the vicinity of the central position of the circular blade 1. An elevating cylinder 6 forms a reciprocating cylinder and the blade 1 is pressed against a cut surface under the weight of the machine body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade supporting mechanism of a concrete cutter for cutting concrete such as paved road surface.

[0002]

2. Description of the Related Art Conventionally, a technique relating to a concrete cutter has been known. For example, a blade is directly attached to a work vehicle, Japanese Patent Laid-Open No. 63-3200.
The technique described in Japanese Patent Laid-Open No. 4 or No. 4 and the technique of rotating the device separately are as disclosed in Japanese Patent Laid-Open No. 63-284302.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the conventional concrete cutter, facilitates cutting with a blade, facilitates attachment and detachment of the blade, and has a center of gravity during work. To improve the stability of the aircraft. In addition, by placing the blade 1 overhanging on one side of the machine,
Shorten the overall length of the concrete cutter body, allow for the attachment of a large diameter blade while being small, deepen the cutting depth, and make the lift arm pivotal support as low as possible on the ground. As a result, the front surface of the blade can be cut, and the block wall and the like can be easily cut.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. That is, the lift arm 9 is pivotally supported by the rear portion of the main frame 2 on which the engine E is mounted via the pivot portion 3, the blade 1 is supported by the front portion of the lift arm 9, and the lift arm 9 is pivotally supported by the pivot portion 3. The blade 1 is configured to rotate up and down between the ground and the ground by rotating up and down around.

Further, a pivotal support portion 3 for pivotally supporting the lift arm 9
Was placed in the lower part of the fuselage near the center of the circular blade 1.

Further, in the structure in which the lifting cylinder 6 is interposed between the lift arm 9 and the machine body to lift the lift arm 9 and the blade 1, the lifting cylinder 6 is used as a double-acting cylinder, and the blade 1 depends on the weight of the machine body. Is pressed against the cut surface.

[0007]

[Operation] Next, the operation will be described. The traveling drive wheels 8 and 8 are driven by the power from the engine E, and the blade 1 bites into the concrete and is cut while advancing at a slow speed. It is necessary for the cutting line to go straight, and a straight position detection sensor 11 and a straight control wheel 5 are provided. In addition, since concrete is often cut in the shape of a grid, it is necessary to laterally move the machine body at a right angle. Therefore, the lateral movement wheels 17 and 17 and the lateral traveling wheel projecting cylinders 26 and 26 are provided to drive the vehicle. The laterally movable wheels 17 and 17 are projected from the wheels 8.8 and the steered wheels 12 and 12 to enable lateral movement. The blade 1 is configured so that not only the force of the lift arm 9 but also the lifting cylinder 6 is double-acted so that the entire weight of the concrete cutter is applied.

[0008]

EXAMPLES Next, examples will be described. 1 is an overall side view of the concrete cutter of the present invention, FIG. 2 is a plan view of the concrete cutter of the present invention, FIG. 3 is a rear view of the concrete cutter, and FIG. 4 is a lift arm 9, a blade drive mission 10, and a cutting steering handle. 4 is a side view of the portion of FIG. 4, FIG. 5 is a plan view of the portion of the lift arm 9, the cutting steering handle 4, and the blade drive mission 10, and FIG. 6 is a hydraulic circuit diagram of the concrete cutter of the present invention.

The overall construction of the concrete cutter of the present invention will be described with reference to FIGS. 1, 2, 3, 4, and 5. An engine E, a radiator 14, a fuel tank 15, a steering handle 13 and the like are arranged on the main frame 2. In the engine E, the crankshaft is arranged in the front-rear direction, and the hydraulic pump 18 for driving the blade 1 is provided at the portion where the crankshaft projects at the front end.
Are arranged. The pressure oil discharged from the hydraulic pump 18 is sent to the hydraulic motor 20 attached to the blade drive mission 10 by a flexible pipe, and the hydraulic motor 2
The blade 1 is rotated after the shift of 0 rotation is performed by the transmission in the blade drive mission 10.

On the lower part of the main frame 2, traveling drive wheels 8 and steering wheels 12 are arranged. Power from the engine E is transmitted to the traveling drive wheels 8 by a traveling mission case equipped with a ring cone type continuously variable transmission. The drive wheels 8 and steered wheels 12
Between the two 12, lateral moving wheels 17, 17 are arranged to enable lateral movement of the concrete cutter body. The laterally moving wheels 17, 17 are normally in a state of being lifted by a hydraulic cylinder, and only when lateral movement is required, the laterally moving wheels 17, 17 are made to protrude from the traveling drive wheels 8.8 and the steering wheels 12, 12 by the hydraulic cylinder. The lateral movement wheels 17, 17 lift the machine body to enable lateral movement.

A pivotal support portion 3 is provided on the side of the main frame 2 constituting the machine body, and the rear end position of the lift arm 9 is pivotally supported by the pivotal support portion 3. An elevating cylinder 6 is interposed between the middle of the lift arm 9 and the main frame 2, and the elevating cylinder 6 is composed of a double-acting cylinder. The lift arm 9 can be lifted by the lift cylinder 6, and conversely, the lift arm 9 and the blade 1 can be pushed down by the lift cylinder 6.

A blade drive mission 10 is fixed to the tip of the lift arm 9, and a hydraulic motor 20 is provided at the front portion of the blade drive mission 10 on the main frame 2 side.
, And the hydraulic motor 20 is arranged in a state of overhanging on the front portion of the main frame 2. A blade cover attached to the lift arm 9 to cover the outer circumference of rotation of the blade 1 is formed in a semicircular shape. Further, the straight-ahead position detection sensor 11 is arranged so as to be capable of expanding and contracting so as to project forward from the lift arm 9. The cutting steering handle 4 is fixed to the main frame 2 and is formed on an extension line connecting the straight-ahead position detection sensor 11 and the blade 1.
The operator can finely adjust the cutting direction of the blade 1 manually by operating the cutting steering handle 4 right and left.

Further, a straight advancing control wheel 5 which is fitted in the groove cut by the blade 1 is constituted, and a pressing force in the left-right direction is applied to the straight advancing control wheel 5 by the balance cylinder 21 in a state of being fitted in the cutting groove. Blade 1
It is possible to control the vehicle to go straight. When the control by the straight traveling control wheel 5 and the balance cylinder 21 is not performed,
The straight-ahead control wheel 5 can be lifted up and released.

As shown in FIGS. 4 and 5, a bracket 7 of the lift cylinder 6 projects upward from the lift arm 9, and the lift cylinder 6 has one end pivotally supported by the main frame 2 and the other end bracket 7. The lift cylinder 6 itself passes through the inside of the lift arm 9. Since the lifting cylinder 6 is configured as a double-acting cylinder, the weight of the machine body can be given to the lift arm 9 and the blade 1.

In FIG. 6, a hydraulic circuit diagram of the concrete cutter of the present invention is disclosed. The engine E is additionally provided with hydraulic pumps 18 and 25. The variable hydraulic pump 18 supplies pressure oil to a hydraulic motor 20 for driving the blade 1, and the output shaft of the hydraulic motor 20 is the blade drive mission 10. Is inserted into the blade drive mission 10 to obtain a neutral stop position and a gear shift position. Further, the pressure oil of the hydraulic pump 25 is supplied to the elevating cylinder 6 via the blade elevating valve 22, and is also supplied to the lateral traveling wheel projecting cylinders 26, 26 via the lateral traveling control valve 23. Further, pressure oil is also supplied to the straight-ahead control valve 24 that operates the straight-ahead control wheel 5 to the left and right by expanding and contracting the balance cylinder 21 in response to the signal detected by the straight-ahead position detection sensor 11.

[0016]

Since the present invention is constructed as described above, it has the following effects. That is, since it is configured as in claim 1, it is no longer necessary to perform heavy labor for lifting the entire body of the blade 1 in order to lift the blade 1 as in the case where the blade 1 is supported by a part of the body as in the conventional case. Of. That is, the blade 1 can be moved up and down via the lift arm 9 by expanding and contracting the elevating cylinder 6 by operating the blade elevating valve 22.

Further, since the construction as described in claim 2 is adopted, the turning locus of the tip of the blade 1 when the lifting cylinder 6 is turned cannot be turned further in the forward direction. It is no longer necessary to round up. As a result, when the blade 1 is moved up and down, an excessive load for rounding up the blade 1 is applied, and the problem that the blade 1 is broken and destroyed is eliminated.

Further, since the blade 1 is supported by the lift arm 9 because it is configured as in claim 3, since the weight of the machine body is not applied to the blade 1, the cutting speed is slow and it is impossible to cut sufficiently deeply. We were able to eliminate the problem. That is, the lift cylinder 6 can push down the lift arm 9 through the weight of the machine body.

[Brief description of drawings]

FIG. 1 is an overall side view of a concrete cutter of the present invention.

FIG. 2 is a plan view of the concrete cutter of the present invention.

FIG. 3 is a rear view of the concrete cutter.

FIG. 4 is a lift arm 9 and a blade drive mission 10.
FIG. 3 is a side view of the cutting and steering handle 4.

FIG. 5 is a plan view of a lift arm 9, a cutting steering handle 4, and a blade drive mission 10.

FIG. 6 is a hydraulic circuit diagram of the concrete cutter of the present invention.

[Explanation of symbols]

 1 Blade 2 Main Frame 3 Pivot 4 Cutting Steering Handle 5 Straight Control Wheel 6 Lifting Cylinder 8 Travel Drive Wheel 9 Lift Arm 10 Blade Drive Mission

Claims (3)

[Claims] 1. A mainframe 2 equipped with an engine E.
A lift arm 9 is pivotally supported on the rear part of the lift arm 9 via a pivot part 3, and the blade 1 is supported on the front part of the lift arm 9.
A blade support mechanism for a concrete cutter, characterized in that the lift arm 9 is rotated up and down about a pivotal portion 3 so that the blade 1 is vertically rotated between the ground and the ground. 2. A blade supporting mechanism for a concrete cutter, characterized in that the pivotal support portion 3 for pivotally supporting the lift arm 9 according to claim 1 is arranged at a lower portion of the machine body near the center position of the circular blade 1. 3. A configuration in which an elevating cylinder 6 is interposed between the lift arm 9 and the machine body according to claim 1 to elevate the lift arm 9 and the blade 1, and the elevating cylinder 6 is a double-acting cylinder, A blade support mechanism for a concrete cutter, characterized in that the blade 1 is pressed against the cut surface by the weight of the machine body.