JPS6231704A - Multistage pilot main valve circuit - Google Patents

Abstract

PURPOSE:To select an optional actuator accurately from many actuators and drive it, by operating directional switching valves with combining pilot pressures of adjusting valves set up by control signals. CONSTITUTION:Adjusting valves 23, 24 set up by control signals are provided plurally, and directional control valves V1-V16 are operated by the combination of working pressures which are discharged from first pilot valves 25-28 operated by the adjusting valve 23 and from second pilot valves 30-33 operated by the adjusting valve 24. Thereby, process of signals for many control signals can be made so that an optional actuator can be selected accurately from many actuators and driven.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a multistage pilot valve circuit for controlling pressures such as hydraulic pressure and pneumatic pressure.

[Prior Art] Generally, in a conventional circuit, as shown in FIG. 6, hydraulic fluid 12 pressurized by a pilot hydraulic pump 11 reaches regulating valves 13, 14, and 15. This regulating valve 13.14.15
Then, each v4M valve 1 is controlled by pressure control from each control line.
3.14.15 Added hydraulic fluid 12 to a specific pilot pressure, e.g. 50 to 9/cd, 100Kg/i, 1
The pilot pressure is set at 50 kg/ci, and the pilot pressure is applied to the directional control valves 16, 17, and 18, respectively, which are operated by a specific pilot pressure. 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 K'J
/cd) determines the direction in which the hydraulic fluid 12 is added. For example, a plurality of actuators A, A2. A3
If you want to drive the actuator A1 from inside, set the 9/cd line to the pilot pressure 50 with the regulating valve 13 whose pressure is controlled by the control line, and apply this pilot pressure to the directional control valve 16. is operated, the valve is switched, hydraulic fluid pressurized to 20ON9/d flows into actuator A1, and actuator A is driven. Similarly, if you want to drive actuator A2, set the pilot pressure to 1100N/cd line,
When it is desired to drive the actuator A3, the pilot pressure is set to the 15C1/d line and each actuator is driven.

[Problems to be solved by the invention] However, in such a circuit, the same number of pilot line systems are required for the number of actuators, and when controlling a large number of actuators, the pilot line system has to be used as the number of piping increases. etc., making it complicated and unsuitable. Conventional systems use solenoid valves to process signals and switch the direction of hydraulic pressure, but solenoid valves have the disadvantage of causing malfunctions due to poor insulation when used underwater, which poses problems for reliability. There was a point.

The present invention has been made in view of the above-mentioned problems, and provides a multi-stage pilot main valve circuit that increases the processing m of hydraulic control signals and enables control signal processing for controlling the drive of a large number of actuators. The purpose is to

[Means for Solving the Problems] The present invention includes at least two regulating valves that control hydraulic pressure to pilot pressures in multiple stages, and selective operation according to the pilot pressure of one of the regulating valves. a plurality of first pilot valves that selectively operate according to the pilot pressure of another one of the regulating valves; The present invention is characterized in that it includes a plurality of directional switching valves that respectively operate in accordance with the combination of operating pressures discharged from the pilot valves.

[Function] Therefore, by combining the pilot pressures of the respective regulating valves set by the control signals, the directional control valve can be actuated and a predetermined actuator can be selected and driven from among a large number of actuators, and the above-mentioned Able to achieve purpose.

[Example] An example of the present invention will be described in detail based on the drawings of FIGS. 1 to 5.

FIG. 1 is a basic configuration diagram of the present invention, in which the hydraulic fluid 21 is pumped to high pressure (P, = 200 kg/a) by a pilot hydraulic pump 22.
1) and reaches the primary side of each regulating valve 23 and 24. The regulating valves 23 and 24 adjust the negative side pressure in four stages, for example 50 to 9/ai, by controlling the pressure of the control line.
100Kg/ci, 9/r:i to 150.

Secondary pressure of 200Kg/aI (pilot pressure PX.

P, ) can be adjusted.

The first pilot valves 25 to 28 are set to operate at different pilot pressures Px, respectively. For example, the pilot valve 25 is 50 to 9/ci to 70Kt/l:d
The pilot valve 27 opens in the range of 150Kg/Cd to 1
Set to open in the range of 70Ky/cd.

The second pilot valves 30 to 33 are set to operate at different pilot pressures P, respectively. For example, the pilot valve 30 opens in the range of 9/aA to 70Kg/ci at 50, and the pilot valve 33 opens at 9/aA to 200Kg/ci.
Set it so that it is within the range of 20ky/cd.

Further, the hydraulic fluid 21 pressurized (Po=200Kg/d) by the hydraulic pump 34 is combined in a lattice shape via the first pilot valves 25 to 28 and the second pilot valves 30 to 33 separately. This leads to directional control valves (1) to (V16), which will be described later. Therefore, the specific tenth pilot valve and the second pilot valve are operated by the predetermined pilot pressures P and PY,
Operating pressure P is applied only to the directional switching valve that corresponds to the combination of pilot pressures P and P mentioned above. is added, and the directional control valve can be operated.

FIG. 2 is a circuit diagram of the first embodiment, which is an application of the basic configuration diagram of FIG. 1, and the same components as in FIG. 1 are given the same reference numerals for convenience of explanation.

The directional control valves V to V16 are the first pilot valves 25 to
The operating pressure P applied via 28. The operating pressure P is applied via the second pilot valves 30 to 33. teeth,
Actuators A1 to A16 are pressurized via directional switching valves.

Therefore, for example, if you want to drive actuator A1,
First, the hydraulic fluid 21 is pressurized by driving the pilot hydraulic pump 22 and the hydraulic pump 25, and the regulating valves 23 and 24 are pressurized.
primary side pressure P, and working pressure P. 200Kg/cf
Raise it to A. Next, the regulating valve 23 is adjusted by the control line, and the secondary pressure (pilot pressure) PX is adjusted to 50/(g/
i, and the regulating valve 24 is also adjusted by the control line to set the pilot pressure PY to 50 Ky/cj.

When the pilot pressure PX is set to 5 (ly/d), the first
The pilot valve 25 is activated and opened, and the hydraulic pump 3
Working pressure P added from 4. is applied to the directional control valve ■1 via the first pilot valve 25.

Therefore, the directional control valve V1 is actuated and switched, and the second pilot valve 30 is connected to the boat and the actuator A.
1 is connected to the boat. At this time, the working pressure [ ]. is also applied to the directional switching valves ■2 to V4 to perform the switching operation, but since the pilot pressure P is not applied, there is no problem.

Further, when the pilot pressure PY is set to 50 Kg/cIi, the second pilot valve 30 is operated and opened, and the operating pressure P is set. is the directional control valve ■ via the second pilot valve 30.
It passes through the open boat No. 1 and joins only the actuator Δ1. Actuator A1 can therefore be driven. At this time, the operating pressure P is the directional control valve V,
V9. Although V13 is also pressurized, the directional control valves V, V0. V1
3 is not performing switching operation, so actuator A5°△9. Δ13 is never driven.

Also, set either the back of the pilot pressure P or PY to 50 K.
If it is set to less than g/ci or 70 Kg/cm or more, one of the backs of the pilot valves 25 and 30 will be closed, and the operating pressure Po applied to the actuator Δ1 will be cut off. Therefore, actuator A1 can return to its initial state by its own spring.

Next, when it is desired to drive the actuator A12, the regulating valve 23 is adjusted by the control line as described above, and the pilot pressure PX is set to 150 kg/i, and the regulating valve 23 is
is also adjusted by the control line, and the pilot pressure PY is set to 200.
Set to Kg/i.

When the pilot pressure Px is set to 150 Kf/i, the first pilot valve 27 is activated and the operating pressure P applied from the hydraulic pump 34 is maintained. is the first pilot valve 27
It is applied to the directional control valve ■12 via the directional control valve ■12. Therefore, the directional control valve ■1□ operates and switches, and the second pilot valve 33
The boat to which the A12 is connected and the boat to which the 7-cut unit A12 is connected are opened.

Further, when the pilot pressure PY is set to 200 Kg/cIIi, the second pilot valve 33 is operated and opened, and the operating pressure P. is applied to only the actuator A12 through the second pilot valve 33 and through the open boat of the directional control valve V12. Therefore, actuator A12
can be driven.

Also, the pilot pressure PX is 150Kg/c! Set it to less than i or 170 kg/cm or more, or set the pilot pressure PY
less than 200 Kg/ctA or 220/(g/c
If it is set to ff1 or more, one of the pilot valves 27 and 33 will be opened, and the operating pressure Po applied to the actuator Δ12 will be cut off. Therefore, actuator A
12 can return to the initial state by its own spring.

FIG. 3 shows a second embodiment of the present invention, which is a circuit for controlling 64 actuators by using three pilot lines and connecting four pilot valve circuits similar to those in FIG. 1. Only the main parts are shown. FIG.

In FIG. 3, a regulating valve 4 for regulating pilot pressure PX is shown.
0 is the respective pilot source valve circuit C, Cb via the third pilot valves 41 to 44.

C and Cd are connected in the same way as in FIG. Further, the adjustment valve 45 that adjusts the pilot pressure PY is connected to each pilot source valve circuit c via the fourth pilot valve/16-49.
,c,,c,cd and 1st a
C They are connected in the same way as in the figure. Pilot valve 41-44.4
6 to 4 are four-stage pilot pressure Pl (for example, 50 kg/cr) adjusted by the regulating valve 50 for each block.
ir, 100Kg/ai, 150 to 9/ci.

200 Kg/ai) and are set to operate at different predetermined pressures. For example, the third pilot valve 41 and the fourth pilot valve 46 have a pilot pressure of 50 Kg/ad to 70 K'J/aA.
It is set to be open within the range of pilot pressure Px
.

PY can be pressurized to the pilot source valve circuit C8. Also, a third pilot valve 44 and a fourth pilot valve 4
9 is set so that the pilot pressure is open within the range of 200 Kg/cti to 220 9/ci, and the pilot pressures P and PY can be pressurized to the pilot main valve circuit cd. Furthermore, in each pilot valve circuit C-C,
As in FIG. 1, the operating pressure Po (P
□ = 200Kg/cd) is added to pressurize each directional control valve and actuator.

Therefore, when it is desired to avoid driving a predetermined actuator of the pilot main valve circuit C8, first, the regulating valves 40 and 45 are adjusted by the control line, and the pilot pressures P and P' are set to predetermined pressures. Next, the regulating valve 50 is adjusted by the control line,
Set pilot pressure P1 to 50Kg/i.

When the pilot pressure Pl is set to 50Kg/c+j,
The pilot valves 41, 46 are actuated to open, and the pilot pressures P 1 and P 2 can be applied only to the pilot source valve circuit C8 via the pilot valves 41°Y 46. Therefore, as in Fig. 1, the pilot main valve circuit C
The predetermined first . The second pilot valve has a pilot pressure P,
P is actuated to open, and the actuating pressure P is applied to the directional control valve via the pilot valve. Therefore, the directional switching valve is switched, and only a specific actuator can be driven by the operating pressure P applied via the directional switching valve.

In addition, the predetermined actuation of the pilot valve circuit cd
If you want to drive one Yuator, adjust the regulating valve 50 using the control line and set the pilot pressure P2 to 200.
By setting it to ci and performing the same operation as above, it is possible to drive a specific actuator of the pilot valve circuit cd.

In the above-described embodiments, signal processing was performed using two or three pilot lines and four pilot pressure levels; however, the present invention is not limited to the above-mentioned embodiments; It is also possible to increase the amount of signal processing. Further, in the embodiment, the first and second pilot valves are operated one by one in response to the pilot pressures P and P, but they may be operated in pairs as shown in FIG. 4. It is also possible to replace the directional control valve with a set of two pilot valves as shown in FIG. These can further limit the operating range to the viroft pressure by a combination of two pilot valves. Furthermore, in the present invention, for example, it is possible to avoid driving two actuators at the same time with one directional control valve, or to connect the two directional control valves with a shuttle valve and drive one actuator with one of the pilot valves. It is also possible to do so.

[Effects of the Invention] As explained above, the present invention includes at least two regulating valves that control hydraulic pressure at multiple levels of pilot pressure, and selective operation according to the pilot pressure of one of the regulating valves. a plurality of first pilot valves that selectively operate according to the pilot pressure of another one of the former cylinder 1 regulating valves; Since it is equipped with multi-directional switching valves that operate in response to the combination of operating pressures discharged from the two pilot valves, it is possible to perform signal processing for a large number of control signals, and it is possible to select any actuator from among a large number of actuators. It is possible to select and drive accurately, and it has effects such as being highly reliable.

[Brief explanation of the drawing]

Fig. 1 is a basic configuration diagram of the present invention, Fig. 2 is a circuit diagram of a first embodiment which is an application of Fig. 1, Fig. 3 is a circuit diagram of the second embodiment showing only the main parts, and Fig. 4. 5 is a circuit diagram showing only the main parts of the third embodiment, FIG. 5 is a circuit diagram showing only the main parts of the fourth embodiment, and FIG. 6 is a circuit diagram of a conventional example. 21... Hydraulic fluid, 22... Pilot hydraulic pump,
23.24... Regulating valve, 25-28... First pilot valve, 30-33... Second pilot valve, 34
... Hydraulic pump, ■1 to V16 ... Directional switching valve, A
1- to 16...actuator, P, P...pilot pressure, Po...operating pressure. Y Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] At least two systems for controlling hydraulic pressure to multiple levels of pilot pressure.
a plurality of first pilot valves that selectively operate according to the pilot pressure of one of the regulating valves; and a plurality of first pilot valves that selectively operate according to the pilot pressure of another one of the regulating valves. a plurality of second pilot valves that are selectively operated according to the first pilot valve, and a plurality of directional control valves that are respectively operated in response to a combination of operating pressures respectively discharged from the first pilot valve and the second pilot valve. A multi-stage pilot main valve circuit characterized by: