DE1809473A1 - Circuit arrangement for a power operated slide, directional control valve or the like. - Google Patents

Description

Circuit arrangement for a power-operated slide, directional control valve or the like. The invention relates to a circuit arrangement for a power-operated Slide, directional control valve or the like, in the main circuit of a pressure medium-operated Consumers, the main circuit can be supplied with pressure medium by a pump is.

It is known to design slides or directional control valves in a power-operated manner, i.e. they are operated e.g. by a pressure medium drive. The pressure medium is thereby for actuating the valve in a separate servo circuit by a pump promoted. However, the separate circuit requires a separate pressure medium supply.

Furthermore, it is also known to free the main circle when the position is ?? Circulation or idling of the directional valve a certain amount of pressure medium for the servo or branch circuit and feed a pressure medium reservoir. The pressure medium supply of the secondary circuit therefore only takes place when the consumer is at a standstill. Will however the consumer seldom stopped and only find switching changes for the work movements instead of the consumer, too little pressure medium is available for the secondary circuit. This is particularly the case with hydraulic excavators or the like.

The aim of the invention is to use a separate servo circuit and the to dispense with associated components and a constant supply of pressure medium to the Secondary circuit even while the consumer is working or when the consumer is operating to have guaranteed and thus a reference to costs, construction costs and function To achieve the optimum.

This goal is achieved according to the invention in that a pressure medium-operated Adjusting device for the slide is provided, which is arranged in a secondary circle is, the pressure medium for the adjusting device in the secondary circuit both during of idling in the main circuit, as well as during consumer operation from Main circuit can be branched off via a throttle and a pressure medium accumulator.

The operation of the slide can be purely power-operated or pressure medium operated as well as mechanically with the support of a power adjustment drive take place.

The advantages of the circuit arrangement according to the invention are that an additional pump, loading valve and the like for a separate servo circuit are dispensable, and that despite this, a constant pressure medium supply in secondary circuit operation the adjustment device is also guaranteed during consumer operation.

The circuit arrangement according to the invention is shown in the schematic drawing shown.

A hydraulic or pressure medium pump 1 delivers via a power-operated one Longitudinal slide 2 on a consumer 3.

The actuation of the power is triggered by a hand lever and Mechanical linkage; i.e. the mechanical actuation is carried out by a pressure medium operated Adjusting device 11 is supported, which actuates the longitudinal slide 2.

The pressure medium is fed by the pump 1 from the container 9 into the line 10 and promoted from there to slide 2.

The line 10 is required for the secondary circuit via a throttle 7 Pressure medium amount branched off. The diverted amount of pressure medium is passed through a check valve 6 either the pressure medium accumulator 5 or the adjusting device 8 is fed directly. The secondary circuit is protected by a pressure relief valve 8. The junction the amount of pressure medium required for the adjusting device also takes place during of the consumer operation in positions I, II of the longitudinal slide 2. In position 0 of the longitudinal slide valve 2 can also be a removal of pressure medium for the Secondary circuit, e.g. by adding an additional locking element between the junction 11 and the longitudinal slide 2 is to be installed or by the fact that even when idling a certain pressure remains in the main circuit. There is no pressure medium in the secondary circuit consumed and the pressure medium accumulator 5 is filled, so the throttle 7 branched Drvr!: Medium quantity via a pressure relief valve 8 to the pressure medium tank 9 returned. The throttle 7 is designed so that at the medium load of the pump 1 a corresponding to the pressure medium consumption of the adjustment device 4 Pressure medium flow flows through the throttle 7. The pressure medium reservoir 5 ensures a continuous supply of the adjustment device 4.

This ensures that even when the main circuit is idling, i.e. when the consumer 3 is at a standstill, a power-operated adjustment of the longitudinal slide 2 or a mechanical actuation of the longitudinal slide supported by power actuation 2 is guaranteed.

Claims (1)

Claim Circuit arrangement for a power-operated slide, directional control valve or the like in the main circuit of a pressure medium-operated consumer, wherein the main circuit can be supplied with pressure medium by a pump, characterized in that that a pressure medium-operated adjusting device (4) is provided for the slide (2) which is arranged in a secondary circuit, the pressure medium for the adjusting device (4) in the secondary circuit both during idling (position 0 of slide 2) in Main circuit as well as during consumer operation (position I, II of the slide 2) can be branched off from the main circuit via a throttle (7) and a pressure medium accumulator (5) can be supplied.