JPS62127502A - Hydraulic controller - Google Patents

Abstract

PURPOSE:To reduce the production cost of a controller by mutually connecting both the ports of a reciprocating actuator through poppet valves on a meter-in side whose opening motions are controlled by a pilot valve. CONSTITUTION:A first and a second hydraulic pump 6a, 6b are connected to each of the flowing in circuits 2a, 2b, 3a, 3b of an actuator I through poppet valves on a meter-in side 4a, 4b, 5a, 5b, and a drain circuit is connected to each of drain circuits 2c, 3c through poppet valves 7a, 7b on a meter-out side. Consequently, the installation of the only two poppet valves 7a, 7b on the meter- out side can attain the purpose of a controller as in the case where one pump is used. Thus, a hydraulic controller can be composed of the fewest poppet valves to reduce its production cost.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refined hydraulic control device for driving a reciprocating actuator such as a swing motor, and particularly relates to a hydraulic control device using a poppet valve as an operating valve. It is.

The above-mentioned hydraulic control device using a conventional poppet valve is shown in FIG.
．． The second hydraulic circuits S, BL are respectively inflow circuits '1m'
'! and drain circuits d,, d, and inflow circuits C,.

C1 has a poppet valve e1, 41 on the meter-in side,
In addition, poppet valves f1, f! on the meter-out side are connected to the drain circuits d, cl, and poppet valves f1, f! are interposed respectively. and each poppet valve tI.

't efl sJ't are each pa(07t%!
I.

For example, the first
Piece of pie:. By activating valve g8, the first meter-in side poppet valve C and the second meter-out side poppet valve f2 are opened, and the actuator iz rotates to the left, for example, and the second pilot valve t is opened. ! , the second meter-in side poppet valve e2 and the first meter-out side poppet valve f2 are opened, and the actuator α is rotated in the opposite direction to the above operation. A, , A are load check valves.

Problems to be Solved by the Invention In the conventional hydraulic control device described above, a plurality of hydraulic pumps are
When trying to selectively use one or more circuits, a plurality of sets of nine circuits were used as shown in FIG. 2 above. For this reason, each time the number of hydraulic pumps increases by one, the number of poppet valves increases by four, resulting in an increase in cost.

Means and Effects for Solving the Problems The present invention has been made in view of the above-mentioned problems, and is designed to selectively use a plurality of hydraulic pumps to operate one actuator t-
Among the poppet valves in the hydraulic circuit to be driven, the meter-out side poppet valves can be reduced to two, as in the case of using one hydraulic motor, and is configured with the minimum number of poppet valves. The aim is to provide a hydraulic control device that enables the reciprocation of the actuator's reciprocating boats. Also, connect both the reciprocating boats of the above attacher 2 to the drain circuit via the poppet valves on the meter-out side, and connect the poppet valve on the meter-in side on the outgoing side and the meter on the return side. The poppet valve on the out side is controlled when in use, and each poppet valve on the meter-in side on the return side and the poppet valve on the meter-out side on the outgoing side are controlled simultaneously, and the poppet valve on the meter-in side is selectively used. Accordingly, a hydraulic pump is selectively used, and the return oil from the actuator is drained from one meter-out poppet valve to the drain circuit.

Example An embodiment of the present invention will be described based on the first example.

The first circuit is a reciprocating circuit of the actuator 1. Second circuit 2.3
are two inflow circuits 2α and 2b, respectively.

3α, 3b and one drain circuit 2c, 3c, and each of the above inflow circuits 21Z#2b.

3α, 3b respectively poppet valve 4α on the meter-in side,
4b, 5a, and 5b. Second hydraulic pump 6a
, 6b. In addition, each drain circuit 2C, 3c
are connected to the drain circuit via poppet valves 7a and 7b on the meter-out side, respectively.

Each of the above poppet valves has the same configuration.
Pipet valve FEa, 8 on the upstream and downstream sides of the poppet valve.
By communicating through the pilot valves b, 8c, and gd, the pilot valves 8α to 8d are opened at an opening degree corresponding to the operation of each of the pilot valves 8α to 8d.

Each of the pilot valves gα to εd is adapted to control one poppet valve on the meter-in side of one circuit and the poppet valve on the meter-out side of the other circuit.

Each of the pilot valves 8α to f3d is operated by a solenoid 9, and the operation of the pilot valves 8α to f3d is controlled according to the current value to the solenoid 9.

In the above configuration, if only one hydraulic pump 6α is to be used, the hydraulic pump 6α to be used is
The pilot valve 8α or 8d for the poppet valve 4α on the meter-in side is operated. As a result, the oil discharged from the hydraulic pump 6α is transferred to the poppet valve 4 on the meter-in side.
The return oil is supplied to the actuator 1 through α, and the return oil at this time is the poppet valve 7b or rI′i7 on the meter-out side.
Drain through a.

When using two hydraulic pumps 6a, 6b, poppets fPs CL, 8b or 8c, fJ on each meter-in side connected to the two hydraulic pumps 6a, 6b.
Activate d. As a result, the two hydraulic pumps 6a, 6
Pressure oil from b is supplied to the actuator 1.

Effects of the Invention According to the present invention, in a hydraulic control device using a poppet valve,
In particular, poppet 7 (Z, 7b) on the meter-out side of a hydraulic control device that selectively uses multiple hydraulic pumps to drive one 7-actuator is the same as when using one hydraulic pump. It can be configured with the minimum number of poppet boxes.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram when one pump is used. I is actuator, 4α, 4b, 5a, 5b. 7+z, 7b! j poppet valve, 6cL+6b is hydraulic pump, 3 tt-w3 rt is pilot valve.

Claims (1)

[Claims] Both reciprocating ports of the actuator 1 that reciprocate are connected to a plurality of hydraulic pumps 6a and 6b, each with a pilot valve 8a.
Poppet valve 4 on the meter-in side that is controlled to open and close at ~8d
a, 4b, 5a, 5b, and both reciprocating ports of the actuator 1 are connected to the drain circuit via poppet valves 7a, 7b on the meter-out side, respectively, and each poppet valve on the reciprocating meter-in side. 4a, 4b and the meter-out side poppet valve 7b on the return side are simultaneously controlled, and each poppet valve 5a, 5b on the return side meter-in side and the poppet valve 7a on the outgoing meter-out side are simultaneously controlled. A hydraulic control device featuring: