KR20040071536A - hydraulic control system and method of hydraulic equipment - Google Patents

Abstract

PURPOSE: A control system for hydraulic pressure of a hydraulic system is provided to shorten the time required for works by controlling the flow rate of hydraulic pressure to an attachment variably and to reduce the deterioration of equipment by preventing the load on equipment. CONSTITUTION: The control system for hydraulic pressure of a hydraulic system comprises: an attachment switch(10) changing a hydraulic circuit to control the supply direction of hydraulic pressure according to the kind of attachments(70) and to supply appropriate hydraulic pressure to an attachment(70); a controller(20) controlling the power sources from a power supply unit, then supplying to a proportional control valve(30); a proportional control valve(30) controlled by the controller(20) which is controlled by the attachment switch(10); a pilot pump(40) generating pilot pressure regularly; a solenoid valve(80) operated by the pilot pressure generated from the pilot pump(40) and controlled by the proportional control valve(30) to control the spool moving direction of a main control valve(60); a main pump(50) generating hydraulic pressure for driving an attachment(70); and a main control valve(60) controlling the rate of hydraulic pressure generated from the main pump(50) by controlling the moving direction of a spool by the solenoid valve(80), the supplying to the attachment(70).

Description

Hydraulic control system and method of hydraulic equipment

The present invention relates to a hydraulic control system and a control method of a work device using hydraulic pressure. In particular, the driver controls the hydraulic pressure supplied to the work machine (attachment: attachment, hereinafter referred to as attachment) using a controller installed in the cab. The present invention relates to a flow control system and a control method of a working device using hydraulic pressure, by which a spool of a main control valve is adjusted to adjust a flow rate supplied to an attachment.

Civil or construction heavy equipment needs to be able to exert a lot of force because they have to carry or load heavy loads or excavate hard ground, and they use hydraulic pressure as a way to meet these conditions.

However, the conventional heavy equipment has a problem in that the working efficiency is lowered since the hydraulic pressure is initially set at the time of manufacture and driven only by the set hydraulic pressure, and the hydraulic pressure cannot be changed according to the type of work environment or attachment.

In order to solve this problem, a method of adjusting the hydraulic pressure by adjusting the rotation speed of the pump is used, but this method is difficult to control as the hydraulic pressure of the entire heavy equipment is controlled, and another method is to install a flow control valve separately. Although the flow rate is manually adjusted, this means that the hydraulic pressure must be manually set again whenever the working environment changes or the attachment is replaced, which makes it difficult to cope with the environmental change occurring during the work.

That is, when towing heavy materials or towing light materials, or when the same hydraulic pressure is applied, excessive movement may occur when towing light materials. When breaking rocks by using a breaker, etc., even when breaking rocks, a certain amount of hydraulic pressure is delivered to the breaker. When crushing the hydraulic pressure is not enough there was a problem that takes too much time to crush the rock.

An object of the present invention is to provide a hydraulic work machine control system and a control method that can be actively coped with the work environment that changes from time to time to solve the conventional problems as described above, as well as to adjust the hydraulic pressure in response to changes in attachments. It is done.

1 is a configuration diagram showing an example of a hydraulic control system according to the present invention,

2 is a circuit diagram showing an example of a hydraulic control system according to the present invention,

3 is a flowchart illustrating a hydraulic control method according to the present invention.

* Description of symbols on the main parts of the drawings *

10: Attachment selection S / W 20: Controller

30: proportional control valve 40: pilot pump

50: main pump 60: main control valve

70: attachment 80: solenoid valve

100: Cab

The present invention having the above object is in the hydraulic work device that can be installed to work attachments detachably, converts the hydraulic circuit so that the hydraulic pressure providing direction and the appropriate hydraulic pressure to the attachment can be provided according to the type of attachment Attachment switch to make; A controller for controlling the power supplied from the power supply means to supply the proportional control valve; A proportional control valve operated by power supply control of a controller controlled by operation of the attachment switch; A pilot pump for generating a constant pilot pressure; A solenoid valve generated from the pilot pump and driven by a pilot pressure regulated by a proportional control valve to control a spool movement direction of the main control valve; A main pump for generating hydraulic pressure for driving the attachment; The movement direction of the spool is controlled by the control of the solenoid valve to adjust the flow rate of the hydraulic pressure generated by the main pump is provided by the flow control system of the hydraulic working device, characterized in that it comprises a main control valve for supplying to the attachment.

In addition, an object of the present invention is a hydraulic control method of a hydraulic work device, comprising: starting the work device and switching to an attachment installed by operating an attachment switch; Controlling the power supplied to the proportional control valve by switching the attachment switch, and operating the proportional control valve by the supplied power; The solenoid valve is operated by the pilot pressure adjusted by the operation of the proportional control valve to control the direction of movement of the spool of the main control valve, thereby adjusting the flow rate supplied from the main pump to the attachment. It is made by the flow control method of the working device.

Hereinafter, an example of a flow control system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram showing an example of a flow control system according to the present invention, Figure 2 is a circuit diagram showing an example of a flow control system according to the present invention, Figure 3 to explain the flow control method according to the present invention Flowchart for

As shown, the flow control system according to the present invention includes an attachment selection switch 10, a controller 20 for controlling the power supply, a proportional control valve 30 for controlling the hydraulic pressure of the pile, and generating a pilot pressure. The pilot pump 40, the solenoid valve 80, the main pump 50 which generate | occur | produces oil pressure, and the main control valve 60 are provided.

The working device using the hydraulic pressure according to the present invention is an equipment on which attachments such as breakers, srushers, grabs, and the like can be installed.

The attachment switch 10 is a switch for selecting an attachment installed in the work device.

The drive signal of the controller 20 is transmitted to the proportional control valve 30, the proportional control valve 30 adjusts the pilot pressure generated from the pilot pump 40, that is, the hydraulic pressure and the flow rate of the hydraulic oil to the subsequent hydraulic pressure It serves to deliver to the circuit.

That is, when the power supplied to the proportional control valve 30 is controlled by the controller 20, and the driving of the proportional control valve 30 is controlled, the flow of hydraulic oil of a constant pressure generated by the driving of the pilot pump 40 is controlled. This is adjusted and supplied to the subsequent solenoid valve 80.

The hydraulic pressure of the hydraulic oil discharged from the pilot pump 40 and adjusted by the proportional control valve 30 is transmitted to the solenoid valve 80 to operate the spool of the main control valve 60, thereby adjusting the opening amount of the flow path. To adjust the flow rate.

The pilot pump 40 is an auxiliary pump for discharging hydraulic oil, as described above, to generate a pilot pressure of a constant pressure, and the pilot pressure is controlled by the proportional control valve 30 to be transmitted to the solenoid valve 80. It constitutes a hydraulic circuit.

The main pump 50 is a means for forming the hydraulic pressure required to operate the attachment 70 in the present invention, the swash plate angle is fixed at the maximum flow rate.

That is, the main pump 50 may be set to output the maximum output that the pump itself can produce.

The hydraulic pressure generated from the main pump 50 is transmitted to the attachment 70 through the main control valve 60.

As described above, the main control valve 60 is discharged from the pilot pump 40 and the moving direction of the spool is adjusted by the hydraulically operated solenoid valve 80 adjusted by the proportional control valve 30. The opening and closing amount of the flow path is adjusted, and accordingly the flow rate delivered to the attachment 70 is adjusted.

In the hydraulic work device according to the present invention configured as described above, the hydraulic pressure and flow rate to be supplied to the attachment can be visually checked by the driver, and the flow rate is adjusted again according to the working condition using the controller 20.

The attachment switch 10 and the controller 20 may be installed in the cab 100 where the driver resides, thereby simplifying the operation.

A driving example of the work device driven by the flow control system according to the present invention configured as described above is as follows.

First, the attachment to be used is installed on the work device.

Start the work device and switch the attachment switch to the attached attachment (S1).

When attachment selection is finished at the attachment switch, the controller switches to the appropriate hydraulic circuit for the selected attachment,

The current / voltage control signal transmitted from the controller controls the power supplied to the proportional control valve, and the proportional control valve is operated by the supplied power.

At this time, a pilot pressure is generated as the pilot pump is started, and the pilot pressure generated from the pilot pump, that is, the hydraulic oil, is adjusted by the proportional control valve.

The hydraulic pressure and the flow rate of the hydraulic oil adjusted by the drive of the proportional control valve are supplied to the solenoid valve to operate the solenoid valve.

By operating the solenoid valve, the spool of the main control valve is moved and the opening amount of the flow path is controlled.

When the opening amount of the flow path is adjusted, the hydraulic pressure supplied from the main pump to the attachment is adjusted to suit the load applied to the attachment.

The operator constantly monitors the attachment's driving status while working and uses the controller to continuously adjust the flow rate.

The present invention is not limited to the contents of the above embodiments, and those skilled in the art will be able to modify and add various embodiments with reference to the embodiments of the present invention.

As described above, the present invention allows to adjust the flow rate supplied to the attachment in accordance with the type and working environment of the attachment, that is, the strength and size of the rock when crushing the rock or the hardness of the ground to be excavated when the rock is excavated. By making it possible to shorten the time required for the work as well as providing an appropriate flow rate for the working environment or the type of attachment is effective to reduce the aging of the device by preventing excessive load on the device.

Claims (2)

In the hydraulic work device which can work by attaching an attachment detachably, An attachment switch for converting the hydraulic circuit so as to provide an appropriate oil pressure to the attachment direction and the oil supply direction according to the attachment type; A controller for controlling the power supplied from the power supply means to supply the proportional control valve; A proportional control valve regulated by power control of a controller controlled by operation of the attachment switch; A pilot pump for generating a constant pilot pressure; A solenoid valve generated from the pilot pump and operated by a pilot pressure regulated by a proportional control valve to control a spool movement direction of the main control valve; A main pump for generating hydraulic pressure for driving the attachment; And a main control valve for controlling the flow direction of the spool under the control of the solenoid valve to regulate the flow rate of the hydraulic pressure generated by the main pump and to supply it to the attachment. In the hydraulic control method of the hydraulic work device, Starting the work device and operating the attachment switch to switch to the attached attachment; Controlling the power supplied to the proportional control valve by switching the attachment switch, and operating the proportional control valve by the supplied power; The solenoid valve is operated by the pilot pressure adjusted by the operation of the proportional control valve to control the direction of movement of the spool of the main control valve, thereby adjusting the flow rate supplied from the main pump to the attachment. How to control the flow of the working device.