JPH043A - Valve device - Google Patents

Abstract

PURPOSE:To carry out two-speed control with facility and certainty by driving an actuator through a changeover valve while utilizing the operation of a solenoid changeover pilot valve of a first unit which composes a base together with a second unit, and throttling or wholly opening a passage to the actuator by means of a two-speed control valve while utilizing the operation of a solenoid changeover pilot valve of the second unit. CONSTITUTION:A base is composed of a hydraulic source 17, a supplying passage 15 leading to a tank 18, first and second units 11, 12 which are communicated with each other through a returning passage 16 respectively have pilot passages 21, 22, 25. A changeover valve 34, solenoid changeover pilot valves 31, 32, a two-speed control valve 33 are superposed on the first unit 11, while the changeover valve 34 is connected to an actuator 19 through load passages 23, 24. A solenoid changeover pilot valve 35 is provided on the second unit 2. The two-speed control valve 33 arranged on a load passage 24 together with a throttle is opened or closed. The operation of the actuator 19 is therefore controlled in two-speed, and operational responsiveness is improved.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention comprises a fluid circuit for actuating an actuator by stacking valve components each having a passage connected to an actuator on a base. The present invention relates to a valve device configured as described above.

[Prior art] Conventionally, this type of device has a valve structure consisting of an electromagnetic switching valve located at the top and various control valves stacked on a base, as shown in, for example, Japanese Utility Model Application Publication No. 54-22692. It is set up.

[Problems to be Solved by the Invention] In the conventional valve device described above, it is necessary to lead and wire a power supply line from the outside to the electromagnetic switching valve disposed at the top of the valve structure. When removing the valve component from the base for repairs or circuit changes after assembly, the wiring must be removed from the valve component, which is a time-consuming process.

In order to deal with this problem, a valve device was proposed in Japanese Patent Application No. 139612/1982 and Utility Application No. 100317/1983, in which the valve assembly can be removed from the base without removing the wiring.

In such a valve device, when controlling the operation of the actuator in two speeds (for example, rapid forwarding and forwarding), as shown in FIG. This can be achieved by stacking the valve 2, the fixed orifice 3, and the throttle (variable throttle) 4 together with the pilot-operated switching valve 5 on the base 6. In the valve device shown in FIG. 3, the electromagnetic switching pilot valves 7a and 7b assembled on the base 6 are respectively switched, thereby switching the switching valve 5 and operating the actuator 8.
can be operated, and the solenoid switching pilot valve 1
By switching and operating the on-off valve 2, the flow rate of the pressure fluid discharged from the actuator 8 can be controlled in two stages by opening and closing the on-off valve 2, and the operation of the actuator 8 can be fast-forward or forward.

By the way, in the valve device shown in FIG. 3, since the electromagnetic switching pilot valve 1 is stacked on the base 6,
The switching valve 5 may be damaged due to repairs or circuit changes after the valve device is assembled.
When removing the equal valve structure from the base 6, the wiring must be removed from the electromagnetic switching pilot valve 1, which impedes the advantage of the valve device (the valve structure can be removed from the base without removing the wiring). There is a problem that In addition, when switching from rapid forwarding to transport, that is, when switching the electromagnetic pilot valve 1 from the energized open state to the de-energized closed state and close it, and when switching the valve body of the on-off valve 2 from the open state to the closed state, the passage 9 When the flow rate of the pressure fluid flowing toward the switching valve 5 is small.

There is also the problem that the flow rate passing through the fixed orifice 3 is small and it takes too much time for the valve body of the on-off valve 2 to change from the open state to the closed state, making it unusable.

The present invention has been made to address each of the above-mentioned problems, and allows the valve component to be removed from the base without removing the wiring, and the actuator operation can be quickly switched in any situation, allowing accurate two-speed control. The purpose is to provide a valve device that can.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention provides the valve device as follows: a supply passage connected to a pressure source, a return passage connected to a low pressure side, and a first pilot. a first unit body having a passage;
A base formed by joining a second unit having a supply passage, a return passage and a tJ2 pilot passage so that each supply passage and each return passage communicate with each other; , has respective passages communicating with the supply passage, the return passage, and the first viroft passage of the first unit, and has an output passage communicating with the load passage connected to the actuator, and has a supply passage through the 1!1 pilot passage. a pilot-operated switching valve that changes the switching state between the supply passage, the discharge passage, and the load passage according to the pressure fluid being discharged; It has a connection passage for connecting a load passage connected to the W2 pilot passage, and has a pilot port connected to the second pilot passage, so that the connection passage is in a constricted state or a fully open state by pressure fluid supplied and discharged through the W2 pilot passage. a first electromagnetic switching pilot valve that is assembled to the first unit and causes pressure fluid to be introduced into or discharged from the switching valve through the first pilot passage; and a first electromagnetic switching pilot valve that is assembled to the IJ2 unit. In addition, the present invention includes a gJ2 electromagnetic switching pilot valve that allows pressure fluid to be introduced into and discharged from the two-speed control valve through the second pilot passage.

Effects and Effects of the Invention 1 According to the configuration described above, the switching operation of the first electromagnetic switching pilot valve assembled to the first unit constituting the base causes the switching operation of the switching valve to supply pressure fluid to the actuator. In addition, by switching the second electromagnetic switching pilot valve assembled on the 12 units that make up the base, the two-speed control valve is switched and a part of the passage connecting the switching valve and the actuator is throttled. state or fully open state, and the operation of the actuator can be controlled at two speeds. In addition, by simply wiring each electromagnetic switching pilot valve provided on the base, wiring is not required for the valve components stacked on the base, and the valve components can be connected without removing the wiring to each electromagnetic switching pilot valve. can be removed from the base.

Further, according to the above configuration, the two-speed control valve is supplied with and discharged from the second pilot passage through the switching operation of the second electromagnetic switching pilot valve, that is, the pressure fluid is supplied from the pressure source to the supply passage and is supplied through the tJ2 pilot passage. Since the two-speed control valve is operated by pressure fluid that can accurately supply a sufficient flow rate at all times, the two-speed control valve always operates quickly without being affected by the flow rate supplied to and discharged from the actuator. Good operational response can be obtained even when the flow rate is small.

[Example 1 An embodiment of the present invention will be described below based on the drawings.

FIG. ing.

The base 10 is made by integrally connecting unit body No. 1.12 joined to each other and end body 13.14 joined to both sides thereof. The supply passage 15 and the return passage 16 are connected in the joining direction (horizontal direction in the drawing).
It penetrates and communicates with. The supply passage 15 has one end connected to the hydraulic pressure source 17 and the other end closed by a plug (not shown). Further, the return passage J No. 16 is connected at one end to the tank 18 which is open to the atmosphere, and the other end is closed by a plug (not shown).

The first unit includes, in addition to the supply passage 15 and the return passage 16, pilot passages 21.22 which are switch-connected to these passages via respective electromagnetic switching pilot valves 31 and 32, and which are orthogonal to both passages 15.16. A load passage 2 formed through (but not communicating with) connected to the actuator 19
3.24, and a supply passage 15.24 on the top surface. Return passage 16° Pilot passage 21.22 and load passage 2
Each of the connection ends 3 and 24 is open, and a two-speed control valve 33 and a switching valve 34 are stacked and arranged so that each passage communicates with these openings.

Each electromagnetic switching pilot valve 31.32 is activated by energization and causes pressure fluid to be introduced into or discharged from the switching valve 34 through each pilot passage 21.22, thereby operating the switching valve 34. It is assembled integrally on one side, and its writing &131a, 32a are provided along the unit body first joining direction, that is, the left-right direction in the figure.

The second speed control valve 33 is connected to the output passages 34a and 34 of the switching valve 34.
b and the load passage 23.2 connected to the actuator 19.
A connection passage 33al for connecting 4.

33a2 and a pilot port 33dl connected to the second pilot passage 25 of the unit body 12, and the connecting passage 33a2 is brought into a constricted state or a fully open state by pressure fluid supplied and discharged through the second pilot passage 25. This is a pilot-operated flow control valve that allows you to adjust the amount of restriction.

As shown in detail in FIG. 2, this two-speed control valve 33 is connected to the connection passage 33a1. A body 33a having 33a2 and stacked and fixed on the first unit body, sleeves 33b and 33c assembled to the body 33a, a cylindrical plug 33d9, a stepped cylindrical holder 33e, and a sleeve 33b.
The spool 3 is assembled to be slidable in the axial direction and forms a constricted portion with a hole 33b1 provided in the sleeve 33b.
3f, and the spool 33f assembled in the holder 33e.
a spring 33g that urges the spool 33f toward the left in the figure, and a stopper 3 that defines the amount of movement of the spool 33f to the right in the figure.
A chamber 331 formed at the right end of the spool 33f in the figure communicates with a chamber 33j formed at the center of the spool 33f through a communication hole 33f1 provided in the spool 33f, and a chamber 331 formed at the right end of the spool 33f in the figure communicates with a chamber 33j formed at the center of the spool 33f. The formed chamber 33 communicates with the inner hole of the cylindrical plug 33d, that is, the pilot port 33dl, through a communication hole 33c1 provided at the axis of the sleeve 33C. The stopper 33h is screwed into the body 33a so that it can move forward and backward, and is fixed by a lock nut 33m, so that the amount of movement of the spool 33f can be adjusted. Also,
As shown in FIG. 1, the body 33a has a supply passage 15, a return passage 16, and a pilot passage 21, 22 of the unit body 1.
Each passage 34c, 34d, 34e, 34f of the switching valve 34
Each passage is provided to communicate with each other.

The switching valve 34 is connected to each passage 3 described above as shown in FIG.
4a, 34b, 34c, 34d, 34e.

It is a 4-bot, 3-position pilot-operated switching valve having a 4-bottom, 3-position pilot-operated switching valve with a pressure fluid supplied to and discharged from each of the passages 34e and 34f through each pilot passage 21 and 22, thereby controlling the supply passage 15, the return passage 16, and the load passage 23. It is possible to change the switching state between 24.

On the other hand, the unit 12 has basically the same configuration as the first unit described above, and in addition to the supply passage 15 and the return passage 16, a pilot passage 25 is connected to these via an electromagnetic switching pilot valve 35. It has a drain passage 26 that constantly communicates with the return passage 16, and a spacer 36 on the top surface.
are arranged in layers. The pilot passage 25 communicates at its upper end opening with the lower end opening of a communication hole 36a provided in the spacer 36, and is connected to the pilot port 33dl of the two-speed control valve 33 through the communication hole 36a and a pipe 37 attached to the communication hole 36a. It's communicating. In addition, open passage 15.16
The upper end openings of the load passages 23, 24, the supply passage 15, and the drain passage 26, which are formed perpendicularly to each other, are closed by spacers 36 and are not used.

The electromagnetic switching pilot valve 35 is operated by energization to introduce or discharge pressure fluid through the pilot passage 25, the communication hole 36a, and the pipe 37, thereby operating the two-speed control valve 33. The wiring 35a is connected in the joining direction of the unit body 12,
That is, they are provided along the left-right direction in the drawing.

In this embodiment configured as described above, the first unit
The switching operation by energizing each of the electromagnetic switching pilot valves 31 and 32 assembled in the unit unit 12 switches the switching valve 34 to supply and discharge pressurized fluid to the actuator 19. 35 switches the two-speed control valve 33, and a part of the passage connecting the switching valve 34 and the actuator 19 (passage 33a2
) is in a throttled state or fully open state, and the operation of the actuator 19 can be controlled in two speeds to fast forward or slow forward.

Therefore, the switching operation from fast feed to slow feed in the second speed control valve 33 is performed by the electromagnetic switching pilot valve 35 in the illustrated state.
This is obtained by energizing the pilot passage 25 to communicate with the supply passage 15, and supplying pressure fluid to the pilot port 33dl through the pilot passage 25, the communication hole 36a, and the pipe 37. In this case, the pressure fluid flowing into the pilot bow 33dl in the second speed control valve 33 is transferred to the communication hole 3 of the sleeve 33c shown in FIG.
3c1 flows into the chamber 33k, and the spool 33f moves against the spring 33g to a position where it abuts against the stopper 33h, and the constricted portion formed by the hole 33b1 of the sleeve 33b is constricted to reduce the passage area.

As a result, the flow rate discharged from the actuator 19 through the passage 33a2 is reduced, and the operation of the actuator 19 is delayed.

On the other hand, the switching operation from slow feed to fast feed in the second speed control valve 33 is performed by the electromagnetic switching pyroft valve 35 in the above-mentioned state.
is de-energized and the pilot passage 25 is returned to the return passage 16.
This is achieved by discharging pressure fluid from the pilot port 33d1 through the pipe 37, the communication hole 36a, and the pilot passage 25. In this case, in the two-speed control valve 33, the pressure fluid in the chamber 33 flows out to the pilot port 33dl, and the spool 33f is moved by the spring 33g to the position shown in FIG. 2, and is formed by the hole 33b1 of the sleeve. The passage area of the diaphragm is increased. As a result, the flow rate discharged from the actuator 19 increases, and the operation of the actuator 19 is made to move rapidly.

In summary, in this embodiment, the electromagnetic switching pilot valve 31.3 is assembled into the first unit constituting the base 10.
By the switching operation of step 2, the switching valve 34 can be operated to switch the pressure fluid to and from the actuator 19, and the base 1
0 by the switching operation of the electromagnetic switching pilot valve 35 assembled in the unit 12 constituting the state or fully open state, and the operation of the actuator 19 can be controlled at two speeds.
By simply wiring the electromagnetic switching pilot valves 31, 32, and 35 provided on the base 10, the valve structure (2
No wiring is required for the speed control valve 33, switching valve 34, spacer 36), and the valve structure can be removed from the base 10 without removing the wiring to the electromagnetic switching pilot valves 31, 32, 35.

Further, according to the above-described configuration, the two-speed control valve 33 controls the pressure fluid supplied and discharged through the pilot passage 25 by the switching operation of the electromagnetic switching pilot valve 35, that is, the hydraulic pressure source 17.
Since the two-speed control valve 33 is operated by pressure fluid that is supplied to the supply passage 15 through the pilot passage 25 and can always accurately supply a sufficient flow rate, the two-speed control valve 33 controls the flow rate supplied to and discharged from the actuator 19. It always operates quickly without being affected, and good operational response can be obtained even when the flow rate supplied to and discharged from the actuator 19 is small.

In the above embodiments, the present invention was implemented in a hydraulic circuit, but the present invention can be implemented in a pneumatic (gas) circuit as well.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing one embodiment of the present invention, and Figure 2 is! !
FIG. 1 is a detailed sectional view of the two-speed control valve shown in FIG. 1, and FIG. 3 is a circuit diagram for explaining the problem to be solved by the present invention. Explanation of symbols 10... Base, 1st... (Ill) unit, 12
... (Second) unit, 15... supply passage, 16.
...Return passage, 17...Liquid pressure source (pressure source) 18...
・Tank (low pressure side), 19...actuator, 21
．． 22... (1!1) Pilot passage, 23.24
...Load passage, 25...(12) Pilot passage,
31.32... (1st) Solenoid switching pilot valve, 3
3...2-speed control valve, 33a1, 33a2...Connection passage, 33dl...Pilot port, 34...Switching valve, 34a, '34b...Output passage, 35... (
2) Solenoid switching pilot valve. Shuren Fengxing Industrial Co., Ltd.

Claims (1)

[Scope of Claims] A first unit having a supply passage connected to a pressure source, a return passage connected to a low pressure side, and a first pilot passage;
A base formed by joining a second unit having a supply passage, a return passage, and a second pilot passage so that each supply passage and each return passage communicate with each other; and a base arranged in a layered manner on the first unit. It has passages that communicate with the supply passage, the return passage, and the first pilot passage of the first unit, and has an output passage that communicates with the load passage connected to the actuator, and supplies the supply through the first pilot passage. a pilot-operated switching valve that changes the switching state between the supply passage, the discharge passage, and the load passage according to the pressure fluid being discharged; It has a connection passage that connects a load passage connected to the second pilot passage, and has a pilot port that is connected to the second pilot passage, and the connection passage is in a throttled state or a fully open state by pressure fluid supplied and discharged through the second pilot passage. a first electromagnetic switching pilot valve assembled into the first unit and configured to introduce or discharge pressure fluid into the switching valve through the first pilot passage; and a first electromagnetic switching pilot valve assembled into the second unit. and a second electromagnetic switching pilot valve that is attached to the valve and causes the two-speed control valve to introduce or discharge pressure fluid through the second pilot passage.