JP3329889B2 - Bulldozer work equipment control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulldozer control device for a working machine, and more particularly, to releasing a plurality of actuators of three or more systems from a single lever without erroneous operation. The present invention relates to a bulldozer work machine control device which enables simultaneous compound operation without the use of a bulldozer.

[0002]

2. Description of the Related Art In general, a blade of a forward working machine of a bulldozer is used.
The lift cylinder, tilt cylinder, angle cylinder, etc. are mounted on the
The tilt cylinder is used to raise and lower the blade, the tilt cylinder is used to move one side of the blade to the ground and tilted to raise the other side, and the angle cylinder is used to move the blade to the center of the vehicle. On the other hand, one is moved forward and the other is pulled backward. In order to operate the blade in this manner, the operating lever and the valve for switching the oil supplied to the cylinder are connected by a mechanical linkage, so that when the operating lever is operated, the valve is switched and the cylinder expands and contracts. This allows the blade to perform various operations. In this case, as a working machine control device, for example, as shown in FIG. 6, the knob 41 of one operation lever is operated backward from the neutral position to raise the blade, and when operated forward, the blade is lowered. When the user further operates in the forward direction, the blade is in a floating state. When operated in the left direction, the blade is tilted to the left. When operated in the right direction, the blade is tilted to the right. When the blade is further rotated to the right, the blade is at a right angle. When the blade is rotated to the left, the blade is at a left angle. . On the other hand, as shown in FIG. 7, when the knob 42 of one operating lever is operated backward from the neutral position, the blade is raised, when it is operated forward, the blade is lowered, and when it is further operated forward, the blade is lowered. When the blade is in a floating state and is operated in the left and right directions, the left tilt and the right tilt are the same, respectively. However, a push button 43 is provided on the knob 42. There is a configuration in which a left angle is shown as shown by a circle, and a right angle is shown as shown in parentheses when it is tilted to the right.
The specific switching structure is as shown in FIG.
That is, the discharge amount of the main pump 44 is
5 (for example, for tilt / angle) and then to one of the two cylinders (for tilt) 46 and (for angle) 47, two circuits 48 and 49 are connected to the main operating valve 45 and the cylinders 46 and 47, respectively. Each with a solenoid-operated switching valve 5
0 and 51 are provided, and when the electromagnetic switching valves 50 and 51 are not switched, the discharge oil from the main operation valve 45 is supplied to the tilt cylinder 46, and when switched, the oil is supplied to the angle cylinder 47. ing. When the push button 43 in FIG. 6 is pressed, the solenoid valve is switched, and the tilt circuit is turned off and the angle circuit is turned on. In the figure, 52 is a main operation valve such as a lift, 53 is a relief valve, and 54 is a tank.

[0003]

However, in the former, simultaneous operation of lift, tilt and angle is possible, but since the valve is directly pulled through a mechanical linkage, the operation force is heavy, and the angle is large. In the case of, there is a drawback that it is difficult to operate only by the movement of the wrist due to the twist operation.
On the other hand, in the case of an angle, the push button operation +
Due to the lever operation, the hand movement is smaller than the former twist operation, but there is a drawback that the simultaneous composite operation of tilt and angle cannot be performed.

[0004] In view of the above, the present invention is a bulldozer operation that enables simultaneous operation of a plurality of actuators of three or more systems without erroneous operation and without releasing a hand from one lever with little labor. An object of the present invention is to provide a machine control device to solve the drawbacks of the prior art.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a work of a bulldozer in which the direction of each main operating valve for the first and second systems of actuators is switched by one operating lever. In the machine control device, an electric switch for the third system is mounted on the knob of the operation lever, and the electric switch is connected to an ON / OFF switching valve, and the ON / OFF switching valve is connected to the third system actuator. Provided in the hydraulic circuit connecting the left and right direction switching ports of the main operation valve and the pilot pump .
1, Actuator of the second system and actuator of the third system
Data and simultaneous operation .

[0006]

According to the above construction, the electric switch for the third system is provided on the knob of the operation lever separately from the operation levers of the first and second systems. Therefore, when the actuator of the third system is operated, the electric switch is provided on the knob . Operate the electrical switch that is turned on,
By switching the OFF switching valve, it becomes possible to switch the left and right directions of the main operation valve for the third system actuator.
Ri, first, same with the second system and the third system, which could not be conventionally
When complex operations can be performed easily.

[0007]

FIG. 1 is a hydraulic and electric circuit diagram of a first embodiment of a bulldozer working machine control device according to the present invention.
2 (a) and 2 (b) show an embodiment of a knob portion of the operation lever of FIG. 1, and FIG. 3 shows a hydraulic and electric circuit of a second embodiment of a work machine control device for a bulldozer according to the present invention. FIG. 4
FIG. 5A is a hydraulic and electric circuit diagram of a third embodiment of a work machine control device for a bulldozer according to the present invention.
(B) is an embodiment of the embodiment of the grip portion of the four-system operation lever which is an extension of FIG.

In the present invention, as shown in FIG. 1, the direction of each of the main operating valves 2 and 3 for the first and second actuators (not shown) is switched by one operating lever-1. In the work machine control device of the bulldozer, an electric switch 4 for the third system is mounted on the knob 1a of the operation lever 1, and the electric switch 4 is turned on and off.
The solenoid-operated switching valves 5 and 6 are connected to the right and left direction switching ports 7a and 7b of a main operation valve 7 for a third system actuator, and a pilot pump. 8 is provided in the middle of a hydraulic circuit that connects to the hydraulic circuit 8.

The operating lever-1 may be a hydraulic pilot type or an electric lever + electrical proportional pressure reducing valve, but in this embodiment, description will be made on the case of a pilot pressure proportional control valve. The pilot pressure proportional control valve includes a first system (for example, lift) 1A and a second system (for example, tilt) 1B. The discharge oil of the pilot pump 8 is supplied by a circuit 10 to the first system 1A and the second system 1B. Are returned to the tank 12 by the return circuit 11 when not used. First
For both the system 1A and the second system 1B, for example, moving one operation lever knob 1a back and forth operates the first system 1A, and moving the operation lever knob 1a left and right operates the second system 1B. It has become. The R side of the first system 1A and the R side port of the main operation valve 2 are connected by a pilot circuit 13, and the L side of 1A and the L side port of the main operation valve 2 are connected by a pilot circuit 14. Are linked. Also, the second
The R side of the system 1B and the R side port of the main operation valve 3 are connected by a pilot circuit 15, and the L side of 1B and the L side port of the main operation valve 3 are connected by a pilot circuit 16. I have. As shown in FIG. 2, the type of the knob 1a in which the electric switch 4 is built is as shown in FIG.
A and 17b and (b) some of which turn ON when one of the seesaws 18 is pressed, and the operation patterns are shown with the same names as in FIGS. 6 and 7 for easy understanding. . The electric switch 4 and the solenoid valves 5 and 6 are connected by electric circuits 19 and 20, and the solenoid valves 5 and 6 are used to switch the left and right directions of the main operation valve 7 of a third system (eg, angle) actuator. 7a, 7b and the pilot circuit 21,
Apertures 23, 23 are provided in the middle of the circuits 21 and 22 for smooth operation.
Further, the solenoid valves 5 and 6 are connected to the pilot pump 8 and the circuit 1.
The circuits are connected by branched circuits 9 and 24 of 0 and 11, respectively. In the figure, 25 is a relief valve, and 26 is a battery. In this embodiment, a main pump for supplying oil to each of the main operation valves 2, 3, and 7, and a circuit from each of the main operation valves to each of the cylinders are omitted. Please refer to.

Next, the operation will be described. As is well known, when the lever knob 1a is operated back and forth or left and right for the first and second main operation valves 2 and 3, the hydraulic pressure of the pilot circuit acts on either the left or right of the main operation valves 2 and 3. Switch the main operating valve from the neutral position to the operating position,
As a result, an actuator (not shown) operates. More specifically, for example, when the operation lever knob 1a is tilted backward, the pilot pressure proportional control valve of the first system 1A is operated, and the pilot circuit 13 controls the R of the main operation valve 2 by R.
The pilot pressure acts on the side port to switch the main operation valve 2 from the neutral position to the operating position. When the push button 17a is pressed separately from such an operation, the electric switch 4 is pressed.
Is turned on, and the electric circuit 19 is energized to turn off the solenoid valve 5 from OFF (the circuit 24 leading to the return circuit 11) to O
N (circuit 9 leading to discharge circuit 10). Therefore, the direction switching port of the main operating valve 7 for the third system is changed.
Hydraulic pressure from the circuit 9 acts on the pilot circuit 21 on the gate 7a, the main operation valve 7 is switched from the neutral position to the operating position, and an actuator (not shown) for the third system operates. Here, when the push button 17a is released, the electric switch 4 is turned off, the electric circuit 19 is cut off,
Therefore, the solenoid valve 5 is switched from ON to OFF, and the main operation valve 7 returns to the neutral position. Push button 17
When b is pressed, the electric circuit 20 is energized and the solenoid valve 6 is turned on.
The operation is switched from FF to ON, and the main operation valve 7 is switched in the opposite direction to the above-described case. In this case, the diaphragm 23 is used to smoothly start and stop the actuator.

FIGS. 3 and 4 show the second and third embodiments of the present invention.
In this embodiment, parts common to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof will be omitted. Only different parts will be described. As shown in FIG. 3, the second embodiment differs from FIG. 1 in that the solenoid valves 5 and 6 of FIG.
In that the diaphragm 23 is eliminated and a controller 29 is provided between the electric circuits 19 and 20, and the first system operation signal 30 and the second system operation signal 31 are input to the controller 29. is there.

Next, the operation of the second embodiment will be described. When the electric switch 4 is turned on, an electric current is output to one of the electromagnetic proportional pressure reducing valves 27 and 28 to switch the third main control valve 7 to operate the actuator. At this time,
The controller 29 adjusts the output current value according to flow control information such as the presence or absence of another simultaneous operation. That is, since the operation of the first or second system and the operation of the third system can be performed simultaneously, the controller 29 can perform the simultaneous operation by adjusting both pressures. At the time of starting and stopping, a modulation is applied to reduce the shock.

The third embodiment differs from FIG. 3 in that an electric switch 4 for the third system is replaced by a proportional switch 32 as shown in FIG.
The point is. The proportional switch 32 may be a pressure-sensitive resistance element in addition to the potentiometer of FIG.

Next, the operation of the third embodiment will be described. The controller 29 outputs a current to one of the electromagnetic proportional pressure reducing valves 27 and 28 in accordance with the output of the proportional switch 32, switches the third main control valve 7, and operates the actuator. In this case, the controller 29 adjusts the output current value according to other flow control information as in the second embodiment.

FIG. 5 shows an operation for the four systems by adding one system (for example, a pitch operation for changing the vertical inclination of the blade forward and backward) to the operation for the three systems (lift, tilt, angle) described above. The lever knob 1a (grip portion) when extended is shown, (a) shows an example in which push button switches 33a and 33b are provided, and (b) shows an example in which a seesaw switch 34 is provided. In this case, needless to say, a new main control valve for the fourth system, an electromagnetic proportional pressure reducing valve, a hydraulic circuit and an electric circuit are newly required.

[0016]

As described above, the present invention relates to a bulldozer in which the direction of each of the main operating valves for the first and second actuators is switched by one operating lever. In the work machine control device, an electric switch for the third system is provided in the knob of the operation lever, and the electric switch is connected to an ON / OFF switching valve, and the ON / OFF switch is connected to the ON / OFF switching valve.
Since the OFF switching valve is provided in the middle of the hydraulic circuit connecting the left and right direction switching ports of the third system main operation valve for the actuator and the pilot pump, three or more systems of the actuators can be operated without erroneous operation. Simultaneous combined operation, which was impossible until now, can be performed with little labor and without releasing the hand from the operation lever knob, so that operator fatigue can be reduced and ground leveling work can be performed easily and accurately.

[Brief description of the drawings]

FIG. 1 is a work machine control of a bulldozer according to the present invention.
FIG. 3 is an explanatory diagram of a hydraulic and electric circuit showing a first embodiment of the control device.

FIGS. 2A and 2B show an embodiment of an operation lever knob (grip portion) shown in FIG. 1, wherein FIG. 2A is a push-button switch, and FIG.

FIG. 3 is an explanatory diagram of hydraulic and electric circuits showing a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of hydraulic and electric circuits showing a third embodiment of the present invention.

FIG. 5 shows another embodiment developed from the operation lever knob (grip portion) of FIG. 1, wherein (a) shows a push button switch,
FIG. 4B is an explanatory diagram in the case of a shear switch.

FIG. 6 is an explanatory diagram of a first example of an operation pattern using a conventional operation lever knob.

FIG. 7 is an explanatory view of a second example of an operation pattern using a conventional operation lever knob.

FIG. 8 is an explanatory diagram of the hydraulic circuit of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation lever 1a Knob 2 Main operation valve of 1st system actuator 3 2nd 〃 4 Electric switch 5, 6 Electromagnetic switching valve 7 Main operation valve of 3rd system actuator 8 Pilot pump 27, 28 Electromagnetic proportional pressure reducing valve 32 Proportional switch

Claims (1)

(57) [Claims] 1. A bulldozer working machine control device in which the direction of each main operation valve for the first and second systems of actuators is switched by a single operation lever. An electric switch for a system, connecting the electric switch to an ON / OFF switching valve, and connecting the ON / OFF switching valve to a left / right direction switching port of a main operation valve for a third actuator; Are provided in the middle of a hydraulic circuit connecting the first and second actuators and the third actuator.
A work machine control device for a bulldozer , wherein simultaneous operation with a tutor is enabled .