JPS6228503A - Composite pilot circuit - Google Patents

Abstract

PURPOSE:To accurately select an arbitrary actuator for driving, by a method wherein processing of a number of control signals is performed through combination of pilot pressures with each other. CONSTITUTION:Regulating valves 21-23, controlling in an n-step a pilot pressure, are situated on the delivery side of a pump 20, and a pressure from the regulating valve 21 is fed as the pilot pressures of first pilot valves 30-32. Second pilot valves 33-44 are connected in a branching manner to the first pilot valves 30-32, and a pressure from the regulating valve 22 is fed as the pilot pressures of the second pilot valves 33-44. Further, a pressure from the regulating valve 23 is fed as the pilot pressures of third pilot valves 42-68 connected to the second pilot valves 33-41. This enables to perform processing of a number of control signals through combination of the pilot pressures with each other, resulting in the possibility to accurately select arbitrary actuators A10-A36 for driving.

Description

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

[Prior Art 1] Generally, in a conventional circuit, as shown in FIG. 4, hydraulic fluid 12 pressurized by a pilot hydraulic pump 11 reaches regulating valves 13, 14, and 15. This regulating valve 13.14.15
Now, each regulating valve 13 is controlled by pressure control from each control line.
．． 14. Hydraulic fluid 12 added every 15 minutes to a specific pilot pressure, e.g. 5089/cd, 100'J/aA
, 150 and 9/ci, and the pilot pressures are applied to directional control valves 16, 17, and 18, respectively, which are operated by specific pilot pressures. 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
9/c++i) The direction of addition of the 4-volume dynamic liquid 12 is determined. For example, a plurality of actuators A1. A2.
If you want to drive actuator A1 from A3,
When the pilot pressure 50 KFI/c#i line is set by the regulating valve 13 whose pressure is controlled by the control line and this pilot pressure is applied to the directional control valve 16, the directional control valve 1
6 operates, the valve switches, and actuator A receives 2
Hydraulic fluid pressurized to 0.00 kg/ci flows in, and actuator A1 is driven. Similarly, actuator A
If you want to drive 2, change the pilot pressure to 100/9/
cm line and when it was desired to drive actuator 3, the pilot pressure was set to 150 Kg/cIi line and each actuator was 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 problems, and an object of the present invention is to provide a composite pilot circuit that increases the amount of processing of hydraulic control signals and enables control signal processing for controlling the drive of a large number of actuators. purpose.

[Means for Solving the Problems] The present invention includes at least two regulating valves that control hydraulic pressure to n-stage pilot pressures, and operates according to the pilot pressure of one of the regulating valves. n first pilot valves, each of which is connected to the first pilot valve in a branched manner and operates in accordance with the pilot pressure of another of the regulating valves; It is characterized by comprising a second pilot valve that discharges the working pressure applied via the first pilot valve.

[Operation] Therefore, by combining the respective pilot pressures set by the control signals, it is possible to select and drive a predetermined actuator from among a large number of actuators, and the above-mentioned object can be achieved.

[Example] An example of the present invention will be described in detail based on the drawings of FIGS. 1 to 3.

FIG. 1 is a circuit diagram showing a first embodiment of the present invention, in which actuators A10'' and A36 are driven and controlled.

The regulating valves 21, 22, 23 are connected to the pilot hydraulic pump 20.
The hydraulic fluid 24 pressurized by the control lines is controlled to have multiple levels of pilot pressure PX, Py, P7,
For example, 9/cra for 50, 9/ci for 100,'
Can be adjusted to 3 levels of 150'Kg/ci.

The regulating valve 21 includes a first pilot valve 30°31.32
are connected via throttle valves B, B, and B, respectively, and the first pilot valves 30 to 32 are connected to the regulating valve 2.
For example, the pilot valve 3 is set to operate at a different predetermined pressure among the three stages of pilot pressure Px.
0 is pilot pressure Px of 50 K9/r, ri ~
Open between 70K9/ci and pilot valve 31
The pilot pressure Px is 10 (1 g/cM ~ 12' OK
The pilot valve 32 is set to open when the pilot pressure Px is between 150.9/aa and 170.9/cri.

The second pilot valves 33 to 41 are connected to the regulating valve 22 through throttle valves 813 to B21, respectively, so that three pieces constitute one block.
41 is set to operate at different predetermined pressures among the three levels of pilot pressure P of the regulating valve 22 for each block. For example, the pilot valve 33
is opened between 50Kg/ai and 70K9/ai, and the pilot valve 37 opens when the pilot pressure PY is 100Kg/ai.
The pilot valve 41 opens between cd and 120 kg/d, and the pilot pressure PY is 9/aA at 150 and 9/aA at 170.
Set it so that it is open between ci.

Third pilot valves 42 to 68 are connected to the regulating valve 23 through throttle valves 822 to B48, respectively, so that three of them constitute one block.
2 to 68 are set to operate at different predetermined pressures among the three levels of biconvex pressure P7 of the regulating valve 23 for each block. For example, the pilot valve 42 has a pilot pressure Pl of 50 kg/c to 50 kg/c. The pilot valve 55 opens when the pilot pressure P1 reaches 100 9/ct.
Open between i-zu 20 and 9/ci, pilot valve 68
The pilot pressure PZ is 150Kg/ci to 1709/
Set it so that it opens between cm.

The throttle valves B1o to 848 have pilot pressure Px.

When setting P,, P7 to a predetermined pressure, for example, 9/ci, 100Kg/ci at 50 in the middle of the stage where the pilot pressure is set from OKg/a/r to 150Kg/Cl11.
This is provided to provide a time delay in the operation of the pilot valve to prevent the actuator from malfunctioning due to instantaneous activation of the relaxation pyrower 1 to valves due to the pressure.

Further, the second pilot valves 33 to 41 are connected to the first pilot valves 30 to 32 for each block, and the third pilot valves 42 to 68 are connected to the second pilot valves 33 to 41. Each block is connected. Furthermore, actuators A1o to A36 are connected to the third pilot valves 42 to 68, respectively, and the hydraulic fluid 24 pressurized by the hydraulic pump 25 (PO=200/(5F/cm)) is supplied to the pilot valves 30 to 68. 36 to each actuator A1o through.

Therefore, for example, when it is desired to drive the actuator Δ18, the pilot hydraulic pump 20. By driving the hydraulic pump 25, the hydraulic fluid 24 is pressurized and the regulating valves 21 to 2 are
3 primary side pressure P, and working pressure P. 200Kg/c
Raise it to rubbish. Next, the regulating valve 21 is adjusted by the control line, and the secondary side pressure (pilot pressure) Px is set to 50 K9.
/ cm 1. : Setting and adjusting valve 22.23
are also adjusted by each control line, and the pilot pressures P and Pl are set to 50' and 9/crA.

When the pilot pressure PX is set to 50 Kt/cI7i, the first pilot valve 30 is operated and opened, and the operating pressure P applied from the hydraulic pump 25 is maintained. is applied to the second pilot valves 33 to 35 via the first pilot valve 30.

Among the second pilot valves 33 to 35, the pilot valve 33 is operated and opened when the pilot pressure P is set to 50 kg/cIA, and the above operating pressure P is reached. via the second pilot valve 33 to the third pilot valves 42, 51 .
Join 60. This third pilot valve 42, 51.6
0, the pilot valve 42 has a pilot pressure Pl of 50
When it is set to Kg/ci, it will start operating and the operating pressure will reach the above-mentioned operating pressure P. pressurizes only the actuator A1o via the third pilot valve 42. Therefore, actuator A1o can be driven.

Also, if any one of the pilot pressures P, P, and Pl is set to less than 50 kg/ci or more than 70 kg/ci, one of the pilot valves 30, 33, and 42 will close, and actuator A1o will close. The applied operating pressure Po is cut off. Therefore, the actuator A10 can return to the initial state by its own spring.

Next, when it is desired to drive the actuator 23, the regulating valve 21 is adjusted by the control line as described above, and the secondary side pressure (pilot pressure) Px is set to 100 Kg/CM, and the regulating valves 22 and 23 are also controlled by each control line. Adjust,
Set the pilot pressures P and P to Z 100 and 9/ctA.

When the pilot pressure Px is set to 100 'J/ctl, the first pilot valve 31 is operated and opened, and the operating pressure applied from the hydraulic pump 25 is 1. (It is applied to the second pilot valves 36 to 38 via the first pilot valve 31. Among the second pilot valves 1 to 36 to 38, the pilot valve 37 has a pilot pressure PY of 100 K!F, 1
When it is set to 0+i, it is activated and the above-mentioned operating pressure P
. is applied via the second pilot valve 37 to the third pilot valve 46.55°64. Of the third pilot valves 46°55.64, the pilot valve 55 is activated when the pilot pressure P7 is set to 100 to 9/crA, and the operating pressure Po is Only 23 is pressurized to the actuator via the actuator.

Therefore, actuator A23 can be driven.

Also, set the pilot pressure p, p, pl to less than 100 kg/cm or 9/cr to 120.
If set to A or higher, any of the pilot valves 31, 37, and 55 will close, and the operating pressure P will be applied to the actuator A23. will be terminated. Therefore, actuator A2
3 can return to the initial state by its own spring.

FIGS. 2 and 3 illustrate the second embodiment of the present invention. In the third embodiment, the circuit has four pilot lines and three pilot circuits similar to those in FIG. 1 are connected to control 81 actuators, and is a circuit diagram showing only the main parts.

In FIG. 2, there are three regulating valves in each of the pilot circuits C, C, and CC similar to those in FIG.
22a, 23a, and a regulating valve 21b in the viroft circuit Cb.
, 22b, 23b, and a regulating valve 21 in the pilot circuit Cc.
They are connected like c, 22c, and 23c. These regulating valves 21a to 23a.

21b to 23b and 21C to 23C have multiple stages of pilot pressure PU (for example, 50 kg/ci) of the regulating valve 70.
, 9/cd is applied to 100, and an operating pressure P from a pilot hydraulic pump (not shown) is applied to 150 via pilot valves 71 to 79 operated by 5F/i>. The pilot valves 71 to 79 are set to operate three at a time in response to different predetermined pressures among the three levels of pilot pressure PU of the regulating valve 70, for example, the pilot valves 71 to 73
The pilot pressure P is 50 K9/ci to 708 g/
Set it so that it is open between cr. Moreover, each pilot circuit Ca.

For Cb and Co, the working pressure P (P o = 200 KfJ / c
d) has been added.

Therefore, when it is desired to drive a predetermined actuator of the pilot circuit C3, the regulating valve 70 is adjusted by the control line, and the pilot pressure PU is set to 5ONy/m. When the pilot pressure PIJ is set to 50 kg/ffl, the pilot valves 71 to 73 are operated and opened, and the operating pressure P is adjusted to the regulating valves 21a to 23a via the pilot valves 71 to 73.
It joins only the primary side of. Therefore, as in Fig. 1, the regulating valve 2
1a to 23a are adjusted by respective control lines to set the downstream pressure P to a predetermined pilot pressure Px, P,.

Since it can be set to Pl, the pilot circuit Ca
A predetermined pilot valve can be actuated. Therefore, the working pressure P. is applied to a particular actuator via the pilot valve, and this actuator can be driven.

In FIG. 3, the - next side pressure P is applied to the regulating valve 80~
82 are respective pilot circuits C, similar to those shown in FIG.
Connected to Cb and Co.

Similarly, the regulating valve 83 to which the primary side pressure P is applied has different pilot pressures P adjusted by this regulating valve 83.
u1 For example, 9/ci for 50, 9/ci for 100.

150 is connected to directional control valves 84-86 which operate at 9/cm. The directional control valves 84 to 86 are connected to each pilot circuit C, C, Cc, respectively, and have an operating pressure P. It is configured to operate so as to discharge the water to each pilot circuit.

Therefore, when it is desired to drive a predetermined actuator of the pilot circuit C6, the regulating valve 83 is adjusted by the control line, and the pilot pressure PU is set to 150 kg/d. When the pilot pressure Pu is set to 150/9/ci, the directional control valve 86 is actuated and switched to the operating pressure P. is applied only to the pilot circuit C6 via the directional control valve 86. Further, as in FIG. 1, the regulating valves 80 to 82 are adjusted by respective control lines, and the downstream pressure P can be set to a predetermined pilot pressure pX, p, p7. Therefore, the operating pressure Po is applied to a specific actuator via the pilot valve of the pilot circuit C6 operated by the pilot pressures Px, P, P2, and the actuator can be driven.

In the above-mentioned embodiments, signal processing was performed using 3 or 4 pilot lines and 3 levels of pilot pressure. However, the present invention is not limited to the above-mentioned embodiments. It is also possible to increase the number of stages and increase the amount of signal processing. Further, the present invention can, for example, drive two actuators at the same time with one third pilot valve, or connect two third pilot valves with a shuttle valve to drive one actuator on either one. It can also be driven by a pilot valve.

[Effects of the Invention] As explained above, the present invention includes at least two regulating valves that control hydraulic pressure to n-stage pilot pressures, and operates according to the pilot pressure of one of the regulating valves. n
n first pilot valves, each of which is connected to the first pilot valve in a branched manner and operates in response to the pilot pressure of another of the regulating valves; Since it is equipped with a second pilot valve that discharges the operating pressure applied through the valve, signal processing for a large number of control signals can be performed by combining each pilot pressure, and any seven actuators can be selected 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 circuit diagram showing the first embodiment of the present invention, Fig. 2 is a circuit diagram of the second embodiment showing only the main parts, and Fig. 3 is a circuit diagram showing only the main parts of the third embodiment. 4 are circuit diagrams showing a conventional example. 20... Pilot hydraulic pump, 21.22.23... Regulating valve, 24... Working fluid, 2
5... Hydraulic pump, 30.31.32... First pilot valve, 33-41... Second pilot valve, 4
2-68...Third pilot valve, A1o-A36.
...actuator, B-8...throttle valve, P, P
,,P7...Pyro 10 48 X cut pressure. Figure 2 84-861--Mando f77 Sakaki Masu Figure 3

Claims (1)

[Scope of Claims] At least two regulating valves that control hydraulic pressure to pilot pressures in n stages, and n first pilot valves that operate according to the pilot pressure of one of the regulating valves. and an operating pressure that is connected to the first pilot valve in a branched manner, each of which operates in accordance with the pilot pressure of another of the regulating valves, and is applied via the first pilot valve. A composite pilot circuit characterized by comprising a second pilot valve that discharges.