KR100212218B1 - Multi-purpose hydraulic control device of heavy equipment - Google Patents

Abstract

The present invention relates to a multi-purpose hydraulic control device for heavy equipment, through a solenoid package (9) to the supply line (6) of the pressure oil discharged from the first main pump (1) in addition to the optional sprue provided in the heavy equipment The second option actuator 10 is installed, and the third actuator 14 is connected to the supply line 13 of the hydraulic oil discharged from the second main pump 2 through the option valve block 15, and the first actuator A solenoid on / off valve 12 is provided at the outlet end of the center bypass line 11, while a loss reduction control valve for regulating the pressure discharged from the auxiliary pump 28 to the second center bypass line 11a ( 29 is provided, and the oil loss control valve 29 is connected to the second center bypass line 11a via the shuttle valve 27. The apparatus of the present invention having such a structure can additionally install three option actuators, and these option actuators can be effectively operated in harmony with the basic actuator of heavy equipment.

Description

Multi-purpose hydraulic controller of heavy equipment

The present invention relates to a multi-purpose hydraulic control device for heavy equipment, and more particularly, to a multi-purpose hydraulic control device that can be effectively used in harmony with the main hydraulic system by additionally connecting three or more options actuators in one heavy equipment.

In general, heavy equipment such as excavators, etc., in order to exert great force, each operating part provided in the drive mechanism and heavy equipment is to operate hydraulically. And the hydraulic pressure is to be generated from the same hydraulic pressure source consisting of one or two hydraulic pumps (101, 102) as shown in Figure 2, the hydraulic pressure generated by the hydraulic pump (101, 102) as one integrated The main control valve unit 103, which is a valve unit, is configured to supply a flow of oil supplied to each actuator.

Here, the main control valve unit is provided with a plurality of spouls (104, 105, 106, 107, 108, 109, 110, 111) for controlling the flow of the pressure oil supplied to the actuator of each operating mechanism, each of these The spoil is used to supply pressure to the actuator (not shown).

On the other hand, it is necessary to install a predetermined separate work tool according to the characteristics of the use of heavy equipment, in order to prepare for this case, the main control valve 103 of the heavy equipment is usually provided with an optional sprue 112, this option It is intended to connect and use the actuator 113 of the work tool to be installed in the sprue for.

However, when one or more actuators are installed in a work tool to be additionally installed in heavy equipment, there is a problem that only one option spool 112 provided in the main control valve cannot be solved.

That is, when one or more actuators are to be additionally installed, there is a problem that the hydraulic system provided in the existing heavy equipment cannot solve the problem.

In addition, in the case where the actuator to be additionally installed is composed of a plurality of complex hydraulic motors and hydraulic cylinders, there is a problem to be able to harmonize with the existing hydraulic system provided in the excavator.

Accordingly, the present invention solves the problems as described above, and allows a plurality of optional actuators to be installed in the excavator, and the option actuator is smoothly and efficiently in harmony with the existing hydraulic system provided in the excavator. The purpose is to provide a multi-functional hydraulic control device of a heavy equipment that can be operated by.

The apparatus of the present invention for achieving the above object, the pressure oil required for heavy equipment is pumped by the first main pump and the second main pump, the pressure oil supplied from the first main pump and the second main pump In the hydraulic control device of heavy equipment, the main control valve is distributed to a plurality of actuators, and the main control valve is provided with an option spring for supplying pressure oil to an optional actuator. A solenoid package having a first option actuator connected to a pool and a solenoid switching valve connected in parallel to the main hydraulic line between the main control valve and the first main pump to control the flow of pressure oil supplied to the second option actuator; Orifice for controlling the flow of pressure oil supplied to the solenoid package from the first main pump, the main control A solenoid valve installed at a rear end of the first center bypass line disposed across the valve to control the pressure delivered to the discharge flow rate control mechanism of the first main pump; and parallel to the main hydraulic line between the main control valve and the second main pump. An option valve package which is connected to the same direction control valve to control the flow of the hydraulic oil supplied to the third option actuator, the first control valve, which is operated by a pedal of the heavy equipment to control the direction switching valve of the option valve package, heavy equipment A second control valve which is operated by another pedal and controls an optional spring of the main control valve, installed on the joystick of the heavy equipment, controls the pressure transmitted to the solenoid switching valve of the solenoid package and the discharge flow rate control mechanism of the first main pump. First and second selection switches for electrically controlling the solenoid valve, the main control A shuttle valve installed at a rear end of the second center bypass line disposed across the valve to selectively transfer the pressure of the second center line and the pressure supplied from the auxiliary pump to the first main pump flow rate control mechanism, and the auxiliary pump. Installed in the oil loss control valve for controlling the flow rate supplied from the auxiliary pump, and the hydraulic pressure generated by the operation of the first control valve through the shuttle valve to generate an electrical signal for controlling the oil loss control valve It consists of a pressure switch.

On the other hand, when the third option actuator is a hydraulic cylinder, a slow return valve can be installed in the return line of the hydraulic cylinder to prevent operation by its own weight.

The apparatus of the present invention having such a structure connects one of the actuators required for the optional sprue provided in the main control valve, and connects the second option actuator through the solenoid package, and through the option valve. By connecting the third option actuator, a plurality of option actuators can be operated without error.

In addition, the hydraulic pressure supplied to the second option actuator and the third option actuator can be selectively operated with the basic actuator connected to the main control valve, and the amount of hydraulic oil required for the option actuator can be selectively controlled. It is.

1 is a hydraulic circuit diagram illustrating a state in which three actuators are additionally installed in heavy equipment according to the present invention.

2 is a schematic hydraulic circuit diagram showing a state in which an optional actuator is installed in heavy equipment according to a conventional method.

* Explanation of symbols for main parts of the drawings

1: 1st main pump 2: 2nd main pump

3: main control valve 4: optional sprue

5: 1st option actuator 6: Main hydraulic line

7: Variable Orifice 8: Solenoid Valve

9: Solenoid Valve Package 10: 2nd Option Actuator

11: first center bypass line 12: solenoid valve

13: 2nd main hydraulic line 14: 3rd option actuator

15: option valve block 16: solenoid valve

17: pedal 18: first control valve

19: shuttle valve 20: pressure switch

21: pedal 22: second control valve

23: joystick 24: joystick

25: electric switch 26: electric switch

27: shuttle valve 28: auxiliary pump

29: Reduction Flow Control Valve

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

1 is a hydraulic circuit diagram for explaining the configuration of the apparatus according to the present invention. As shown in this figure, the apparatus of the present invention is the pressure discharged from the first main pump 1 and the second main pump 2. Oil is to be distributedly supplied through the main control valve (3), the first option actuator (5) is connected to the optional sprue (4) provided in the main control valve (3).

A solenoid package 9 having a solenoid valve 8 is connected to the first main line 6 between the first main pump 1 and the main control valve 3 through an orifice 7. The second option actuator 10 is connected to the solenoid package 9, and the flow rate of the first main pump 1 is connected to the outlet of the first center bypass line 11 passing through the main control valve 3. The solenoid valve 12 which controls the flow of the hydraulic oil supplied to a control mechanism (not shown) is provided.

On the other hand, an optional valve block 15 for controlling the flow of pressure oil supplied to the third actuator 14 to the second main line 13 between the second main pump 2 and the main control valve 3 is connected. The first control valve 18, which is operated by the first pedal 17 of heavy equipment, is connected to the switching valve 16 of the option valve block 15. The pressure switch 20 is installed in the shuttle valve 19 connected across both lines, while the pressure switch 20 controls the pressure transmitted to the flow control mechanism of the first main pump 1. It is electrically connected with (12).

In addition, a second control valve 22 operated by the second pedal 21 of the heavy equipment is connected to the option spring 4 provided in the main control valve 3, and the second pedal 21 By operating the hydraulic pressure generated by the option spring (4) is to be switched to the left and right.

In addition, electric switches 25 and 26 are provided on the left and right joysticks 23 and 24 of the heavy equipment, and the electric switches 25 and 26 are the solenoid valves 8 and the first main of the solenoid package 9. It has a structure electrically connected to the solenoid valve 12 for controlling the pressure delivered to the discharge flow rate control mechanism of the pump (1).

On the other hand, the shuttle valve 27 is installed at the rear end of the second center bypass line 11a disposed across the main control valve 3, the pressure and the auxiliary pump of the second center bypass line 11a. The larger pressure is selected from the pressure supplied from 28 to the discharge flow rate control mechanism for controlling the discharge flow rate of the second main pump 2, and between the auxiliary pump 28 and the shuttle valve 27. Has a structure in which a reduced flow rate control valve 29 is installed to control the flow rate transmitted from the auxiliary pump 28, and the reduced flow rate control valve 29 is electrically connected to the pressure switch 20. The flow rate control valve 29 is opened and closed in accordance with the electric signal transmitted from 20 to control the flow rate transmitted from the auxiliary pump 28 to the shuttle valve 27.

The device of the present invention having such a structure is, for example, a heavy equipment used to pick up and move a car in a place such as a junkyard of an automobile, and is used by attaching a number of such junk device to an existing excavator, Branch actuators can be connected and used as needed.

That is, the nibble cylinder used for the operation of grabbing a scrapped vehicle is connected to the optional sprue 4 provided in the main control valve 3, and the nibler motor used for rotating the bite is first. The main cylinder 1 is connected to the solenoid package 9 which is supplied with pressure oil, and a clamp cylinder used to clamp a seized waste vehicle is connected to the option valve block 15.

This arrangement makes it possible to distribute the appropriate flow rate and pressure in consideration of the various actuators arranged in the excavator.

That is, due to the work characteristics, the nibbler swinging motor has almost no combined operation with the hydraulic motor for turning the excavator itself. It is preferable to connect to 1), and connecting the clamp cylinder 14 to the second main pump 2 side can increase work efficiency.

Accordingly, the pressure oil discharged from the second main pump 1 operates the clamp cylinder constituting the third actuator 14 via the option valve block 15. At this time, the switching operation of the option valve block 15 is controlled by the pilot pressure oil supplied through the first control valve 18 connected to the pedal 17.

On the other hand, in order to prevent the clamping cylinder 14 (which is the same as the third actuator) from lowering when the lowering speed is excessively increased due to its own weight, the slow return valve 30 is connected to the return line 30 of the clamp cylinder 14. 31) can be installed and used.

When the clamp cylinder 14 is operated as described above, the pilot pressure oil supplied through the first control valve 18 is transferred to the pressure switch 20 through the shuttle valve 19, and the pressure switch ( 20, an electrical signal is generated as the pilot pressure is applied to switch the reduction flow control valve 29. The reduction flow control valve 29 supplies the pilot pressure oil supplied from the auxiliary pump 28 to the second. The discharge flow rate of the second main pump 2 is controlled according to the magnitude of the load applied to the clamp cylinder 14 by transferring the discharge flow rate of the main pump 2 to the flow rate control mechanism for controlling the discharge flow rate.

On the other hand, when the clamp cylinder 14 is not operated, the discharge pressure of the second main pump 2 transmitted through the center bypass line 11a is discharged from the second main pump through the shuttle valve 27. It is delivered to the control mechanism so that the discharge amount required when operating the heavy equipment is obtained.

That is, the shuttle valve 27 transmits the pressure of the load applied to the clamp cylinder 14 to the discharge flow rate control mechanism of the second main pump 2 when operating the clamp cylinder 14, and operates the excavator normally. In this case, the pressure of the second center bypass line 11a is transmitted to the discharge flow rate control mechanism of the second main pump 2 so that the discharge flow rate is always varied according to the operating pressure of the actuator installed in the excavator.

In addition, the switching operation of the option spring 4 provided in the main control valve 3 is switched by the pilot pressure oil supplied through the second control valve 22 operated by the pedal 21. The nibble cylinder (5), which is an optional actuator, is moved up and down.

Meanwhile, the nibble motor 10, which is the second option actuator, is discharged from the first main pump 1, passes through the orifice 7, and is supplied through the solenoid valve 8 of the solenoid package 9. In this case, the switching operation of the solenoid valve 8 controlling the turning direction of the nibbler motor 10 is controlled by the operation of the electric switches 25 and 26 installed in the joysticks 23 and 24. Is made by.

That is, when the nibbler motor 10 is to be rotated to the left side, the electric switch 25 installed in the left joystick 23 is turned on, and on the contrary, the nibbler motor 10 is to be rotated to the right. In this case, the electrical switch 26 installed on the right joystick 24 may be turned on.

As described above, when the nibbler motor 10 is operated, an electric signal generated by the electric switches 25 and 26 of the joysticks 23 and 24 is installed at the rear end exit of the first center bypass line 12. It is transmitted to the opening and closing solenoid 12, the first center bypass line 12 is to block the connection to the discharge flow rate control mechanism of the first main pump (1).

Therefore, when operating the nibbler motor 10, since the discharge amount of the first pump 1 is not varied and always maintains a constant discharge amount, the rotation speed of the nibbler motor 10 is kept constant. do.

The flow rate supplied to the nibbler motor 10 is properly controlled and supplied from the variable orifice 7 as necessary, and the required flow rate can be adjusted manually.

In the above-described bar, there are two switches 25 and 26 installed in the joysticks 23 and 24, and both joysticks 23 and 24, since both switches 25 and 26 are connected to the solenoid valve 12. The solenoid valve 12 is supplied with power even when it is operated.

As described above, the multifunctional hydraulic control apparatus for heavy equipment according to the present invention is provided with a solenoid package in the supply line 6 of the pressurized oil discharged from the first main pump 1 in addition to the optional sprue provided in the heavy equipment. 9) the second option actuator 10 is installed, and the third actuator 14 is connected to the supply line 13 of the hydraulic oil discharged from the second main pump 2 through the option valve block 15. The solenoid on / off valve 12 is installed at the outlet end of the first center bypass line 11, and the pressure that is discharged from the auxiliary pump 28 is adjusted to the second center bypass line 11a. A flow rate control valve 29 is provided, and the reduced flow rate control valve 29 is connected to the second center bypass line 11a through the shuttle valve 27, thereby providing three optional actuators. You can easily operate it as needed. The tube initiator and if necessary a basic actuator provided in the heavy equipment used in combination which will not enhance the efficiency of the heavy equipment.

Claims (1)

The pressure oil required for heavy equipment is pumped by pressure in the first main pump 1 and the second main pump 2, and the pressure oils supplied from these main pumps 1 and 2 are transferred through the main control valve 3. In the hydraulic control apparatus of heavy equipment, which is distributed to the air, and the main control valve (3) is provided with an optional spring (4) for supplying the hydraulic oil to the optional actuator, the option of the main control valve (3) The second option actuator 10 is connected in parallel to the first option actuator 5 connected to the sprue 4 and the main hydraulic line 6 between the main control valve 3 and the first main pump 1. Solenoid package (9) having a solenoid switching valve (8) for controlling the flow of the pressure oil supplied to the), variable orifice for controlling the flow of pressure oil supplied from the first main pump (1) to the solenoid package (9) (7), disposed across the main control valve (3) A solenoid on-off valve 12 installed at the rear end of the first center bypass line 11 to control the pressure delivered to the discharge flow rate control mechanism of the first main pump 1, the main control valve 3 and the second main An optional valve package 15 having a directional valve 16 connected in parallel to the main hydraulic line 13 between the pumps 2 and controlling the flow of the hydraulic oil supplied to the third option actuator 14, the pedal of the heavy machinery The main control valve (3) is operated by the first control valve (18), which is connected to the control valve (16) of the option valve package (15) and the other pedal (21) of heavy equipment, and is operated by (17). 2) the second control valve 22 for controlling the optional sprue 4), the joysticks 23 and 24 of the heavy equipment, and the solenoid switching valve 16 of the solenoid package 15 and the first center bypass. Installed at the rear end of the line 11 is delivered to the discharge flow rate control mechanism of the first main pump (1) First and second selection switches 25 and 26 for electrically controlling the solenoid valve 12 for controlling pressure, and the rear end of the second center bypass line 11a disposed across the main control valve 3. A shuttle valve (27) installed at the second center bypass line (11a) and selectively transferring the pressure supplied from the auxiliary pump (28a) and the pressure supplied from the auxiliary pump (28) to the flow rate control mechanism of the second main pump (2); The oil loss generated by the operation of the oil loss control valve (29) for controlling the flow rate supplied from the auxiliary pump (28) and the first control valve (18) between the control valves (18). Multi-purpose hydraulic control device of the heavy equipment consisting of a pressure switch 20 for generating an electrical signal for controlling the reduction of flow control valve 29 by detecting through a shuttle valve (19) installed in the pilot line (18a, 18b).