KR970009527B1 - Method for automatically lifting up oil pressure in the excavator - Google Patents

Abstract

At the time of working, the pressure detecting signal that is recognized at the main pump and the pressure detecting signal during the arm curl operation are received, and in case the input of the main pump satisfies at the same time the continuous signal when the first relief pressure state signal is continued for certain period of time by the working environment, the pressure detecting signal and excavator work mode at the time of arm curl or the signal on the selecting operation mode, the engine throttle lever(f) potential and the pump swash plate send the electric control signal by the governor motor(g) and the electronic proportion reducing valve(c) for adjusting.

Description

Automatic boosting method and device of construction equipment

1 is a recent configuration diagram of the device of the present invention.

2 is a block diagram of a controller used in the present invention.

* Explanation of symbols for main parts of the drawings

(a1), (a2): Two stage relief valve (b): Solenoid valve

(c1), (c2): Pressure sensor (d): Pressure switch

(e): Electronic proportional pressure reducing valve (f): Throttle lever

(g): Governor motor (h): Main control valve

(i): Engine (j): Work mode monitor

(k): Controller (l): Female Curl Pilot Pipeline

(m): Main route

The present invention relates to a method and apparatus for automatic boosting of heavy equipment under construction, in equipment such as an excavator, such as excavators in construction equipment, work failure due to rock or tree roots during the excavation or selection of equipment When it occurs, the machine automatically handles the obstacles and removes the obstacles for convenience and improves the work efficiency.

In the existing excavator, when the work end is caught on rocks or tree roots during the excavation work or the flattening work, the worker directly judges this and presses the booster switch to perform the work. At the same time, the pressure switch must be pressed, which increases the factors that the worker must judge during the work, and thus, the work cannot be performed smoothly, which causes inconvenience to subsequent work.

From the above point of view, in order to perform the work efficiently by digging or picking only one task, the worker must reduce the elements to be judged to the minimum. For this purpose, the equipment determines the situation by itself. By doing the work, the labor of the worker can be saved and the work efficiency is improved.

In order to achieve the above object, the present invention attaches the pressure sensors (c1), (c2) to detect the hydraulic oil pressure during operation to the discharge pipe of the main pump as shown in FIG. m1) and (m2) are two-stage relief valves (a1) and (a2), which can be set to two-stage boosting, for example, one-stage relief 325 bar, two-stage relief 350 bar, and initially set to one stage. By applying pressure to the relief valve, a solenoid valve (b) is installed to change the spring constant of the relief valve so that it can be driven as a two-stage relief valve (a1) or (a2). In order to detect the accompanying curl operation, a pressure switch d is installed as a pressure sensing mechanism in the female pilot pilot passage l of the operating lever so that the signal can be recognized by the controller k, or an electric joystick When using the lever There is such that amkeol signal is separated from the other input signal to the controller. The controller is divided into the input part, the judgment part, the memory part, the calculation part, and the output part as shown in FIG. 2. In this case, the input part receiving the signal when the pressure of the main pump reaches the primary relief state and the time after the relief state is reached Memory for storing about 3-4 seconds duration and output state of engine and pump in that state, judging unit for judging whether to turn on auto boost by these signals, and signal to be output by them It is composed of arithmetic unit and output unit to determine. The controller accepts the pressure sensing signal recognized by the main pump during operation and the pressure sensing signal during the armal operation.At this time, the continuous signal when the pressure of the main pump is maintained as the primary relief pressure status signal by the working environment for a certain time and If the pressure sensing signal in the armical and the signal in the excavator operation mode or the selection operation mode are satisfied at the same time, the engine throttle lever (f) displacement and the pump swash angle are adjusted so that the engine power of the equipment and the pump discharge amount are maximized. g) and electronic proportional pressure reducing valve (e) to send and adjust the electric control signal, and to operate the step-up solenoid valve (b) so that the two-stage relief valves (a1) and (a) can be operated. To form obstacles such as rocks or tree roots and simultaneously apply static forces such as pressure rise and dynamic forces such as increased work speed due to increased pump discharge volume. Remove the obstacle. Afterwards, when the pressure in the main pipe begins to drop at the same time as the obstacle is removed, the controller (k) disconnects the solenoid valve (b) driving signal to release the two-stage relief state by the pressure sensing signal lowered below the relief pressure. The storage means of k) returns to the engine output and pump discharge state of the previous working mode so that the work can be continued. However, even though it is boosted, if the obstacle is not removed and the auto boosting state lasts a long time, the equipment is exerted. Therefore, it is released for 8 seconds without being lasted for more than 8 seconds. After the releasing of the pressure signal, the controller can remember the memory and execute the function again when the auto boost condition is reached.

Unexplained symbol (h) is the main control valve (i) is the engine (j) is a working mode monitor.

According to the present invention, the power boosting function of the construction equipment, that is, the excavator, which is performed by the manual operation in the existing equipment is automatically performed, so that the worker can perform the work more comfortably and efficiently.

Claims (4)

In the excavator under construction, the attachment is attached, the pressure sensor (c1) (c2) on the main line (m) to measure the discharge pressure of the main pump during operation and the pressure as the pilot pressure sensor at the time of the female work of the operating lever The controller (k) is equipped with a switch (d) and receives the pressure sensing signal and outputs a control signal after the calculation, and the output is adjustable by the electrical signal of the controller (k) and the throttle lever (f) and the governor motor ( There is a pump equipped with an engine (i) equipped with g) and an electromagnetic proportional pressure reducing valve (e), and two-stage relief valves (a1) and (a2) capable of making the pressure applied to the actuator two-stage, and the pilot pressure. And a solenoid valve (b) capable of driving a two-stage relief valve (a1) (a2) by means of an automatic boosting device for heavy construction equipment. In the excavator under construction, the pressure in the actuator is fixed to the first stage relief pressure by the main pipeline pressure sensing mechanism due to the work mode signal, the falcon work signal during the excavation or picking operation and the obstacle during operation of the equipment. Under the condition of the input signal when it is maintained for the set time, the signals are automatically operated by the controller (k) command to operate the solenoid valve (b) within a certain time range to boost the pressure to the second stage relief pressure and at the same time the engine output horsepower. And the pump discharge amount is kept to the maximum, and after the obstacle is removed by this operation, the pressure in the main pipe m decreases, so the controller k recognizes this falling pressure signal, and the boosting pressure is automatically released. A method for automatically boosting heavy construction equipment, characterized by returning operation to a previous working state by a controller (k) storage means. According to claim 2, If the automatic boosting time of the work machine exceeds the set time, the automatic boosting function is released and returns to the previous state, and if the pressure sensing signal at the time of the releasing releases the condition of claim 1 above automatically Automatic boosting method of the heavy equipment, characterized in that to return to the boosting function. The method of claim 2, wherein when using an electric joystick as an actuating lever, a female signal can be distinguished from other work operating levers.