JPH0874293A - Maneuvering device for construction machine - Google Patents

Abstract

PURPOSE: To improve the working ability and safety of a construction machine by composing an operation device so as to press only one pushing rod corresponding to the moving direction of an operation lever in the case of moving the operation lever in one of the forward, backward, right and left directions. CONSTITUTION: A cross joint 4 is attached to the upper part of a pilot valve 2, and a disc 5 is attached to the upper part of the joint 4. In addition to that, four pushing rods 3 are provided on the upper part of the pilot valve 2 so that they may be pressed by the lower face of the disc 5. A guide member 8 having a cross-shaped slit is stuck on the upper part of the pilot valve 2, and an operation lever 6 is erected on the upper part of the disc 5 so as to be movable forward and backward, right and left along the cross-shaped slit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to the structure of a control device mounted on construction machines such as hydraulic excavators and work vehicles.

[0002]

2. Description of the Related Art FIG. 5 is a side view of a main portion of a control device 1 conventionally used in a hydraulic excavator or the like. In the figure, 2 is a pilot valve, 3 is a push rod of the pilot valve 2, 4 is a cross joint, 5 is a circular plate, and 6 is an operating lever. FIG. 6 is a cross-sectional view of a main part of the control device 1 viewed from AA in FIG. As shown in FIGS. 5 and 6, in the control device 1, the disc 5 is attached to the upper part of the cross joint 4 attached to the center of the upper surface of the pilot valve 2, and the operating lever 6 is attached to the upper part of the disc 5. It is standing.
Also, on the upper surface of the pilot valve 2 and on the disc 5
Four push rods 3 are provided so as to project around, and the push rod 3 is pressed by the lower surface of the disc 5. As described above, the operating lever 6 is the disc 5
Since it is connected to the cross joint 4 via, it can be freely moved in any directions such as front, rear, left and right. When the operation lever 6 is moved, the disc 5 presses the push rod 3 and the pressure oil from the hydraulic source (not shown) is pushed.
An actuator (not shown) is operated directly or indirectly from the side circuit. In addition, the operation lever
The stroke of the push rod 3 is changed according to the operation stroke of 6, and the speed of the actuator can be controlled. Further, as shown in FIG. 7, when the operation lever 6 is operated in either the X direction or the Y direction, it becomes an independent operation of pressing any one of the push rods 3A, 3B, 3C, 3D, and the operation lever 6 is operated. When operated in the middle of the X and Y directions, the two adjacent push rods 3A, 3C, 3
It is possible to perform a combined operation of simultaneously pressing any one of C and 3B, 3B and 3D, 3D and 3A.

[0003]

The above-mentioned conventional operating device has the following problems. That is, by operating one operating lever in any direction in the front, rear, left, and right directions, a single push rod can be moved to operate a single actuator, and an independent operation can be performed.
You can also perform a combined operation in which two push rods are moved to activate two actuators at the same time. This is an essential function for hydraulic excavators to improve work efficiency. However, there is almost no opportunity to perform complex operations during the operation of the machine for special work, for example, when an attachment for foundation work such as an auger (not shown) is installed, and it is safer not to perform complex operations. You can work on it. The present invention is useful for operating levers in special work.
It is intended to provide a control device that restrains the movement of the robot and can easily perform a work with higher accuracy.

[0004]

In a control device in which the inclination of one operating lever is converted into the pressing amount of four push rods provided on the upper surface of the pilot valve for operation. A guide member for restraining the movement of the operation lever in only four directions of front, rear, left, and right is fixed to an edge portion of the upper surface of the pilot valve, and the operation lever is front, rear, left, or right. Only one push rod corresponding to the direction is pressed when the crab is moved.

The guide member is formed of a thin plate member in the shape of an upper hemisphere, and a cross groove having a width through which the operation lever can pass is formed in the central portion in plan view.

The guide member is formed by bending four small-diameter rod members at right angles in a plan view on the upper face portion of the flange, which is approximately the same size as the upper edge portion of the pilot valve, and then bending the four rod members. The right-angled portions are arranged at the center side at equal intervals, and the distance between the linear portions of the adjacent bar members is set to the above-mentioned operation lever.
A cross-shaped guide is formed to be slightly larger than the diameter so that the operation lever can move, and both ends of each of the four rods are fixed to the upper surface of the flange.

[0007]

In the control device of the present invention, the guide member for restraining the movement of the operating lever only in the four directions of front, rear, left and right is fixed to the upper edge of the pilot valve. As a result, when the operation lever is moved in any of the front, rear, left, and right directions, only the push rod corresponding to that direction is pressed, so that an independent operation can always be performed. Therefore, when performing a foundation work such as an unillustrated auger, it is possible to easily perform a work with higher accuracy without accidentally operating a plurality of actuators.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway side view of a control device 7 according to claim 1 of the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as those in the prior art. Reference numeral 8 is a guide member. FIG. 2 is a plan view of the guide member 8 in FIG. In the figure, 9 is a cross-shaped slit formed in the guide member 8. As shown in the figure, a guide member 8 is fixed to the upper edge of the pilot valve 2. The guide member 8 is formed of a thin plate member into a substantially hemispherical shape,
A cross-shaped slit 9 having a width slightly larger than the diameter of the operation lever 6 is formed in the center thereof. Therefore, the movement of the operation lever 6 is guided by the slit 9 of the guide member 8 to move only in the cross direction, and the movement of the intermediate portion thereof is blocked. This makes it possible to operate with a single actuator, which is completely independent operation, and there is no concern that it will be a combined operation.

FIG. 3 shows a guide member 10 according to claim 2 of the present invention.
FIG. In the figure, 11 is a flange, 1
2 is a guide rod. FIG. 4 is a side view of the guide member 10 in FIG. As shown in FIGS. 3 and 4, four small-diameter round bars or square bars are bent on the upper surface of the flange 11 at right angles in a plan view, and then the operation lever 6 is opened with an interval through which the operation lever 6 can pass. A cross-shaped guide is formed so that 6 can move forward, backward, leftward and rightward. Therefore, the movement of the operation lever 6 is guided by the guide rod 12 of the guide member 10 to move only in the cross direction, and the movement of the intermediate portion thereof is blocked. As a result, you can work with peace of mind because there is no concern of becoming a single operation and a compound operation.

[0010]

According to the present invention, the guide member for restraining the movement of the operating lever is fixed to the upper edge portion of the pilot valve to prevent the combined operation, and the independent operation is always performed. As a result, when a special work such as a foundation work that does not require a complex operation is performed, the work can be performed with peace of mind, and the workability and the safety can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a control device according to claims 1 and 2 of the present invention.

FIG. 2 is a plan view of a main part of a guide member in FIG.

FIG. 3 is a plan view of an essential part of the guide member according to claim 1 and claim 2 of the present invention.

FIG. 4 is a side view of a main part of the guide member in FIG.

FIG. 5 is a side view of a main part of a conventional control device.

6 is a plan view of a main part of the control device in FIG.

[Explanation of symbols]

 1,7 Control device 2 Pilot valve 3 Push rod 4 Cross joint 5 Disc 6 Operation lever 8,10 Guide member 11 Flange 12 Bar material

Claims (3)

[Claims] 1. A control device such as a hydraulic excavator for converting the inclination of one operating lever into the pressing amount of four push rods provided on the upper surface of a pilot valve for operation. A guide member for restraining the movement of the operation lever in only four directions of front, rear, left, and right is fixed to the upper edge of the pilot valve, and the operation lever is fixed.
A control device for a construction machine, characterized in that, when is moved to the front, rear, left, or right, only one push rod corresponding to the direction is pressed. 2. The guide member is formed of a thin plate member in an upper hemispherical shape, and a cross groove having a width through which the operation lever can pass is formed in a central portion of the guide member in plan view.
Control device for the construction machine described. 3. The guide member comprises the four rods formed by bending four small-diameter rod members at right angles in a plan view on the upper face portion of a flange having substantially the same size as the upper edge portion of the pilot valve. The operation levers can be moved by arranging the right-angled portions of the material at equal intervals with each other and making the distance between the linear portions of the adjacent bar materials slightly larger than the diameter of the operation levers. 2. The control device for a construction machine according to claim 1, wherein the guide is formed in a cross shape, and both ends of each of the four rods are fixed to the upper surface of the flange.