JPS6263203A - Circuit combined with pilot - Google Patents

Abstract

PURPOSE:To facilitate selective driving of actuators by arranging a group of the actuators as well as a plurality of pilot valves which have different pilot pressure for supplying working fluid to the actuators on output side of two control valves which output different pilot pressure. CONSTITUTION:Respectively paired pilot valves 25-29, 30-34 are provided on a supply passage of pressure liquid which drives a plurality of actuators A11-A15, and the respective pilot valves have working pilot pressure differently set respectively. Meanwhile, the respective pilot valves are connected to pilot pressure liquid passages arranged in two systems, and requlator valves 20, 21 are provided respectively on the respective pilot pressure liquid passages in order to regulate pilot pressure. A desirable number of actuators can be driven by regulating output pilot pressure of the requlator valves 20, 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pilot combination circuit for controlling pressures such as hydraulic pressure and pneumatic pressure.

[Prior Art] Generally, in a conventional circuit, as shown in FIG. 3, hydraulic fluid 12 pressurized by a pilot hydraulic pump 11 reaches regulating valves 13, 14, and 15. This regulating valve 13.14.
．． At 15, each regulating valve 13, 14. ．． The hydraulic fluid 12 added every 15 is set to a specific pilot pressure, for example, 50 Kfl/cM, 9/cri to 100, and 9/ctA to 150, and each of the above pilot pressures is a direction switch operated by a specific pilot pressure. Valve 16°17.18. The directional control valve to which this specific pilot pressure is applied performs a valve switching operation, and is pressurized by the hydraulic pump 19 (P o =
200 K9/c#i) The direction in which the hydraulic fluid 12 is added is determined. For example, multiple actuators A, A
2. If you want to drive the actuator A1 from within A3, set the pilot pressure 50K9/cM line with the regulating valve 13 whose pressure is controlled by the control line, and apply this pilot pressure to the directional control valve 16.
6 is activated and the valve is switched, and the A1 to 2
Hydraulic fluid pressurized to 00 Kg/c#i flows in,
The actuator Δ1 is driven. Similarly, Aku L
If you want to drive tuator A2, set the pilot pressure to 100 to 9/crlr line, and if you want to drive actuator Δ3, set the pilot pressure to 150? G? /c#i line to drive each actuator.

[Problems to be solved by the invention] However, in this type of circuit, the same number of pilot line systems are required for the number of actuators, and in a case where a large number of actuators are controlled, the pilot line system requires an increase in the number of piping. etc., making it complicated and unsuitable. Conventional systems use solenoid valves to process signals and switch the direction of the liquid, but solenoid valves have the disadvantage of causing malfunctions due to poor insulation when used underwater, which poses problems for reliability. was there.

The present invention has been made in view of the above problems, and is a pilot combination that is configured by combining pilot line systems that control a large number of actuators, and that enables processing of a large number of information signals for controlling the actuators. The purpose is to provide circuits.

[Means for Solving the Problems] The present invention provides first and second regulating valves that control the hydraulic pressure to pilot pressures in multiple stages, and the pilot pressure of the first regulating valve of the regulating valves. a plurality of first pilot valves that selectively operate according to the pilot pressure of a second regulating valve among the regulating valves; The present invention is characterized by comprising an actuator that is selectively driven in accordance with the operating pressure discharged by the combination of the second pilot valve.

[Operations] Therefore, a predetermined pilot pressure for each regulating valve can be set by the information signal, and one or more predetermined actuators can be selected and driven from a large number of actuators by a combination of the pilot pressures, and the above-mentioned You can achieve your goals.

[Example] An example of the present invention will be described in detail based on the drawings of FIGS. 1 and 2.

FIG. 1 is a circuit diagram of the present invention, in which actuators A11 to
It is a diagram when driving and controlling Δ15.

The regulating valve 20.21 adjusts the hydraulic fluid 23 pressurized by the hydraulic pump 22 to a plurality of pilot pressures Px, P, for example 5 (1 g/cd, 100K) by controlling the pressure of the control line.
g/cM, 150Kg/cn, 200kg/ci, 2
Can be adjusted in 5 stages from 50 to 9/aj, adjustment valve 20.21
First pilot valves 25 to 29 and second pilot valves 30 to 34 are separately connected to. The first pilot valves 25 to 29 and the second pilot valves 30 to 34 are
They are combined into a set of two, and have five levels of pilot pressure Px.
, P, are set to operate in pairs for different predetermined pressures, for example, the first pyrobe 1
~Valve 25 opens at a pilot pressure of 250 K9/cM or higher, and the second pilot valve 30 opens at a pilot pressure of 50 K.
If you leave it open at g/cd or higher, the pilot valve will open at 25°3.
In the 00 group, the pilot pressure Px is 9/aj or more to 250,
The open state is maintained within a range where the pilot pressure PY is 50.9/cr1 or more. In addition, if the first pilot valve 28 is opened when the pilot pressure is 100 and 9/cd or more, and the second pilot valve 33 is opened when the pilot pressure is 2008y/d or more, then in the set of pilot valves 28°33, the pilot pressure Px is 1008g/cM or more, pilot pressure PY is 20
The open state is maintained within a range of 0 to 9/cM or more.

Pressure P is applied by the pilot hydraulic pump 24. The hydraulic fluid 23 is supplied to each actuator A11 through a first pilot valve and a second pilot valve that are combined in pairs.
~A1. It is configured to join.

FIG. 2 is a diagram showing the combinations of pilot pressures Px and PY necessary to drive the actuators A11 to A15 in FIG. 1. For example, if the pilot pressure Px is 50 K9/
If cM and pilot pressure PY are set to 250 and 9/cm, only actuator A15 will be driven, and if pilot pressure Px and PY are set to 250 and 9/cm, actuators Δ11 to A12 will all be driven simultaneously. can.

If you want to drive the actuator Δ11, first pressurize the hydraulic fluid 22 by driving the pilot hydraulic pump 22 and the hydraulic pump 24 as shown in FIG.
21's primary side pressure P3 and operating pressure Po are increased. The regulating valves 20, 21 are then regulated by the control line to obtain a secondary pressure (pilot pressure) PX based on the pilot pressure combination shown in FIG.

Set PY to 250Kg/ci, 508g/c#i.

Pilot pressure P, PY is 250KFI/c#i, 50
When set to K9/cti, the first pyrowa 1~
Of the valves 25 to 2 and the second pilot valves 30 to 34, the pilot valve 25.30 is operated and opened, and the operating pressure P applied from the hydraulic pump 21 is applied. is the pilot valve 25
．． It is applied only to actuator Δ11 via 30. Therefore, actuator A11 can be driven under pressure.

Also, set either pilot pressure P or PY to 25 O.
K9/cM, if the value is less than 50Kg/ctA, either the back of the pilot valve 25 or 30 will close, and the operating pressure P will be applied to the actuator A. will be terminated. Therefore, the actuator A11 can return to the initial state by its own spring.

Next, when it is desired to drive the actuators A12 to A14, the regulating valves 20, 21 are adjusted by the control line as described above, and the pilot pressures Px, P are set to 200 K9/crA, respectively, based on the combination shown in FIG.

When the pilot pressures PX, PY are set to 200 K'j/cM, the first and second pilot valves 25-3
4, the pilot valves 26 to 28 and 31 to 33 are operated and opened, and the operating pressure P is applied from the hydraulic pump 21. are applied to actuators A12-A14 via pilot valves 26-28 and 31-33, respectively. Therefore, the actuators A12 to A14 can be driven under pressure.

Also, set either pilot pressure Px or PY to 200.
If the value is K9/cm without swirl, the pilot valve 26
~28. One of the pilot valves from 31 to 33 is closed, and the corresponding actuator (actuator A
14, the operating pressure Po applied to actuators A13 and A14 or actuators A12 to A14) is cut off. Therefore, the relevant actuator can be returned to the initial state by its own spring.

In the above-mentioned embodiment, the signal processing was performed using two pilot lines and five pilot pressure levels, but the present invention is not limited to the above-mentioned embodiment. It is also possible to configure a circuit to perform even more signal processing. You can also connect multiple actuators to a set of pilot valves and drive these multiple actuators simultaneously, or connect two sets of pilot valves with a shuttle valve, and connect one actuator to either set of pilot valves 1 to 1. It can also be driven by Furthermore, by configuring a hydraulic circuit by combining these, it is also possible to provide a complex discrimination function.

[Effects of the Invention] As explained above, the present invention includes first and second regulating valves that control hydraulic pressure to a plurality of pilot pressure levels, and a control valve that controls the pilot pressure of the first regulating valve among the regulating valves. a plurality of first pilot valves that selectively operate according to the pilot pressure of a second regulating valve of the regulating valves; Since it is equipped with an actuator that is selectively driven according to the operating pressure discharged by the combination of pilot valves, the pilot line system can be configured by combining them, and a large number of information can be used to select and control a large number of actuators individually or at the same time. signal processing.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a diagram showing a combination of pilot pressures for driving the actuator of FIG. 1, and FIG. 3 is a circuit diagram without showing the conventional example. 20.21... Regulating valve, 22... Pilot hydraulic pump, 24... Hydraulic pump, 25-29... First pilot valve, 30-34... Second pilot valve,
A11 to A15...actuator, Px, Py...
・Pilot pressure.

Claims (1)

[Scope of Claims] First and second regulating valves that control hydraulic pressure to a plurality of pilot pressure levels; and a plurality of first and second regulating valves that selectively operate according to the pilot pressure of the first regulating valve of the regulating valves. 1 pilot valve; a plurality of second pilot valves that are selectively operated according to the pilot pressure of the second of the regulating valves; and a combination of the first and second pilot valves. A pilot combination circuit characterized by comprising an actuator that is selectively driven according to operating pressure.