KR200356079Y1 - An Oil Control Device of Construction Machine - Google Patents

Abstract

The present invention allows the flow rate discharged from the hydraulic pump to be properly distributed and supplied to other attachments through the main control valve, and accordingly, it is possible to perform a double operation of construction equipment such as an excavator, and to simplify the control valve. It relates to a hydraulic control device of construction equipment that can be made extremely easy to install in the hydraulic system by the configuration.

The technical constitution is that the main valve 30 connected as the hydraulic pump 10 and the main port 20 has a first supply port for supplying hydraulic pressure at a position opposite to the main port 20. 40 and the second supply port 50 for supplying hydraulic pressure to the attachment, respectively, so that the solenoid valve 60 is installed between the hydraulic pump 10 and the main valve 30, the main valve 30 Is installed to selectively transmit the hydraulic pressure to the first and second supply ports (40, 50), the spool (70) is installed inside the main valve (30), the solenoid valve (60) By selectively blocking the first and second supply port 40, 50 by the operation of the hydraulic pressure can be supplied to either side, the second supply port that is addressed to the main valve 30 to drive the attachment ( When the hydraulic pressure of 50) is higher than the set pressure, the return of the hydraulic pressure is prevented and the main controller valve 80 And in that the relief valve 90 is installed ever supplying oil pressure to the base.

Description

Hydraulic Control Device of Construction Equipment

The present invention, when operating the attachment of the construction equipment such as excavators, loaders and other attachments, the hydraulic pump to a number of work machines that are installed in the construction equipment without the need for a separate hydraulic reserve port, such as buoys, buckets, arms The hydraulic control device of the construction equipment that can properly distribute and supply the flow rate discharged from the gas flow, and in particular, the flow rate discharged from the hydraulic pump can be properly distributed to other attachments through the main control valve Of course, while also allowing a double operation of the construction equipment, such as excavators, and related to the hydraulic control device of the construction equipment to be made extremely easy to install in the hydraulic system by a simple configuration of the control valve.

In general known hydraulic equipment of construction equipment such as excavators, etc., two or more hydraulic pumps driven by one engine, pour cylinder, arm cylinder, bucket cylinder, swing motor and left and right traveling motor It is to operate several actuators, such as the hydraulic system, the start, stop and speed control of each actuator is made by operating a control valve connected to the hydraulic pump, each actuator and control valve is It is combined so as not to interfere.

However, the conventional conventional conventional excavator hydraulic apparatus as described above is composed of parallel hydraulic circuits using two hydraulic pumps as shown in FIG. 1, and when one of the actuators 101, 102, 103, 104 in either direction is used, If only the hydraulic pump (a) is used, and the actuators 105, 106, 107, 108 in the other direction is used to supply the hydraulic fluid using the other hydraulic pump (b), two hydraulic pumps (partly if necessary) and a working oil supplied from a and b).

Therefore, in order to operate each of the actuators on either side individually, since the valves connected to the actuators are also connected in parallel with the hydraulic pump (a), accurate operation is caused by the mutual interference during operation. Not only the control is not made, but in particular, even when the extra flow rate of the other hydraulic pump (b) to join the two actuators (101, 102), for example, to operate the correct flow rate to each of these actuators can not be distributed This was there.

On the other hand, in order to improve such a disadvantage, in recent years, each control valve for controlling the supply of operating oil to each actuator is installed, and three solenoid valve bidirectional logic valve and two solenoid valve relief valve between the control valve The hydraulic control device of an excavator for supplying the hydraulic fluid properly while controlling the supply amount of the hydraulic oil discharged from the hydraulic pump by installing the respective actuators in parallel to each other is known from Korean Utility Model Publication No. 1992-0008658. .

That is, the technical configuration is connected in parallel so as to drive the first and second hydraulic pumps 2 and 3 and the auxiliary hydraulic pump 4 by the engine 1 of the excavator, as shown in FIG. Supply hydraulic oil to the first and second hydraulic pumps 2 and 3 and the respective actuators 5, 6, 7, 8, 9 and 10 operated by receiving hydraulic oil pressurized and discharged from these hydraulic pumps 2 and 3 Each control valve (5a, 6a, 7a, 8a, 9a, 10a) is installed to control the three solenoid section bidirectional logic valve (11, 12, 13) and two between each control valve An electromagnetic flow rate distribution block 16 comprising solenoid valve portion relief valves 14 and 15 is provided to connect the respective actuators 5, 6, 7, 8, 9 and 10 in parallel. The auxiliary hydraulic pump 4 is connected to the electromagnetic proportional pressure reducing valves 19 and 20 for controlling the swash plate angle adjusting mechanisms 17 and 18 of the first and second hydraulic pumps 2 and 3 electronically. This auxiliary hydraulic pump ( By operating the swash plate angle adjusting mechanisms 17 and 18 of the first and second hydraulic pumps 2 and 3 by the hydraulic oil discharged from 4), the supply flow rates discharged from these hydraulic pumps 2 and 3 are adjusted. It is to be given.

However, the hydraulic circuit system is complicated by installing a separate electronic flow rate distribution block 16 composed of a control valve and a solenoid for supplying the hydraulic oil pressurized and discharged from the first and second hydraulic pumps and the auxiliary hydraulic pump to each actuator. In particular, when the electronic flow distribution block is installed in construction equipment such as an excavator that is subjected to severe impact, malfunctions and breakages due to impact force are frequently generated, resulting in inefficiency, and an economic burden due to its installation. There were many problems.

The present invention has been made to improve the conventional problems as described above, the purpose is, when operating by mounting the attachment to the bogie of the construction equipment, it is installed in the construction equipment without the need for a separate hydraulic reserve port and electronic equipment It is possible to properly distribute and supply the flow rate discharged from the hydraulic pump to several working machines, such as pours, buckets, and arms, through the main control valve, and accordingly, the attachment operation of construction equipment such as excavators is possible. It is to provide a hydraulic control device of construction equipment that can be made extremely easy to install in the hydraulic system by a simple configuration of the control valve.

1 is a schematic hydraulic schematic diagram of a general construction equipment.

2 is a schematic configuration diagram of a conventional excavator hydraulic control device.

3 is a hydraulic circuit diagram of a hydraulic control device of construction equipment according to the present invention.

Figure 4 is a front sectional configuration of the main valve for selectively supplying hydraulic pressure to the bogie and attachment of the construction equipment of the present invention.

5 is a hydraulic circuit diagram of a hydraulic control device for supplying hydraulic pressure to the attachment of the construction equipment of the present invention.

6 is a schematic circuit diagram of a relief valve of the present invention.

Explanation of symbols on the main parts of the drawings

10.Hydraulic pump 20 ... Main port

30 ... main valve 40 ... 1st supply port

50 ... 2nd supply port 60 ... solenoid valve

70 ... Spool 80 ... Bottle Main Control Valve

90 ... Relief Valve

As a technical means for achieving the above object, the present invention is connected to the hydraulic pump and the main port, supplying the hydraulic pressure to the first supply port and attachment to supply the hydraulic pressure to the position opposite to the main port A main valve to which the second supply port is extended;

A solenoid valve installed between the hydraulic pump and the main valve to selectively transmit the hydraulic pressure of the main valve to the first and second supply ports;

A spool installed inside the main valve to selectively block the first and second supply ports by the operation of the solenoid valve;

And a relief valve installed to supply hydraulic pressure to the main control valve while preventing the return of the hydraulic pressure when the hydraulic pressure of the second supply port which is addressed to the main valve and drives the attachment is higher than the set pressure. By providing hydraulic control device for construction equipment.

In addition, the present invention is characterized in that the bogie main control valve spoke with the relief valve, so that the fluid can be delivered with the first supply port for supplying hydraulic pressure to the bogie.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a hydraulic circuit diagram of the hydraulic control device of the construction equipment according to the present invention, Figure 4 is a front sectional configuration diagram of the main valve for selectively supplying hydraulic pressure to the bogie and attachment of the construction equipment of the present invention, the hydraulic pump (10 ) And the main valve 30 connected as the main port 20 are configured to supply hydraulic pressure to the first supply port 40 and the attachment to supply hydraulic pressure to a position facing the main port 20. 2, the supply port 50 is opened, and at this time, a solenoid valve 60 is installed between the hydraulic pump 10 and the main valve 30 to supply the hydraulic pressure of the main valve 30 to the first and second supply ports. It is installed to selectively transmit to the port 40, 50.

In addition, a spool 70 is installed inside the main valve 30 to selectively block the first and second supply ports 40 and 50 by the operation of the solenoid valve 60. In this case, the hydraulic pressure is supplied to the main valve 30, and when the hydraulic pressure of the second supply port 50 that is extended to the main valve 30 to drive the attachment is higher than the set pressure, the return of the hydraulic pressure is prevented and the main control valve 80 is provided. The relief valve 90 is configured to supply hydraulic pressure to the furnace.

Referring to the operation and effects of the present invention made of such a configuration as follows.

As shown in FIGS. 3 to 6, the main valve 30 connected as the hydraulic pump 10 and the main port 20 is configured to supply hydraulic pressure to a position opposite to the main port 20. The solenoid valve 60 installed between the hydraulic pump 10 and the main valve 30 in a state where the first supply port 40 and the second supply port 50 for supplying hydraulic pressure to the attachment are extended, respectively. In operation, the fluid of the hydraulic pump 10 is transferred to the first supply port 40 through the main port 20 of the main valve 30 to drive the bogie of the construction equipment (Fig. 3).

On the other hand, when the solenoid valve 60 installed between the hydraulic pump 10 and the main valve 30, as shown in Figure 5, the fluid waiting in the solenoid valve 60 is inside the main valve 30 The second supply hole port for driving the attachment while pushing the spool (70) which is installed in the spool (70), and the fluid of the first supply port 40 for driving the bogie by the spool 70 is blocked ( 50) is opened to drive the attachment.

Subsequently, when the hydraulic pressure flowing to the second supply port 50 for driving the attachment is greater than or equal to the set pressure, the fluid is not returned to the hydraulic tank, and as shown in FIG. 5, the fluid flows out from the main valve 30. The hydraulic pressure is supplied to the first main supply valve 40 and the main main control valve 70 which extends through the relief valve 90.

Therefore, the relief valve 90 when the second supply port 50 is greater than or equal to the set pressure while driving the attachment through the main valve 30 and the second supply port 50 without requiring a separate reserve port at all. ) And the bogie to allow the bogie to be driven through the main control valve 80, thereby enabling the construction of construction equipment such as excavators.

As described above, according to the hydraulic control device of the construction equipment of the present invention, when operating by mounting a different attachment to the truck of the construction equipment, a number of working machines that are installed in the construction equipment without the need for a separate hydraulic reserve port and electronic equipment The flow rate discharged from the hydraulic pump to the bucket, arm and the like can be properly distributed and supplied through the main control valve, and accordingly, the attachment operation of the control valve to the construction equipment such as an excavator can be performed. The simple configuration has an excellent effect that can be very easily installed in the hydraulic system.

Although the present invention has been illustrated and described in connection with specific embodiments, it should be understood that the present invention may be variously modified and changed without departing from the spirit or the scope of the present invention provided by the following claims for utility model registration. Those skilled in the art will want to know easily.

Claims (2)

In the hydraulic control device of construction equipment, A first supply port 40 which is connected as the hydraulic pump 10 and the main port 20 and supplies hydraulic pressure to a position facing the main port 20 by a truck and a second supply port which supplies hydraulic pressure to the attachment A main valve 30 to which each of the 50 is opened; A solenoid valve 60 installed between the hydraulic pump 10 and the main valve 30 to selectively transmit the hydraulic pressure of the main valve 30 to the first and second supply ports 40 and 50; A spool (70) installed inside the main valve (30) to selectively block the first and second supply ports (40) (50) by the operation of the solenoid valve (60); Relief valve installed to supply hydraulic pressure to the main control valve 80 while preventing the return of the hydraulic pressure when the hydraulic pressure of the second supply port 50 that is attached to the main valve 30 to drive the attachment is more than the set pressure (90); hydraulic control device of the construction equipment, characterized in that configured to include. The trolley main control valve 70 of claim 1, which is communicated with the relief valve 90, is speeched so that fluid can be transferred to the first supply port 40 for supplying hydraulic pressure to the trolley. Control equipment of construction equipment.