JPS60125479A - 4-poppet valve - Google Patents

Abstract

PURPOSE:To enable 4-position switch operation by providing the first and second two-position solenoid switch valves capable of controlling the first and second poppet valve bodies and two two-position pilot operation switch valves capable of controlling the third and fourth poppet valve bodies. CONSTITUTION:Four poppet valve bodies 40, 48, 50, 55 are disposed in each passageway connecting ports PA, PB, AR, BR. The first and second poppet valve bodies 46, 48 are controlled to open and close by the first and second two-position solenoid switch valves SOLa, SOLb. The third and fourth poppet valve bodies 50, 52 are controlled to open and close by two two-position pilot operation switch valves 90, 92 through the solenoid valves SOLa, SOLb. Combination of opening and closing poppet valve bodies can be changed by switching the solenoid valves SOLa, SOLb.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-position valve capable of directional control, and particularly to a four-position valve capable of switching between four positions.

In recent years, as mechanical equipment has become more doll-like and faster, the hydraulic pressure of I actuators, etc. has increased! Since there is also a trend toward higher pressure and larger capacity, compared to the conventional spool 1 door type switching JF,
There is a tendency for 4-bove valves with low fluid passage resistance to be adopted.

By the way, conventional 4-position valves can switch between 3 positions for directional control, but cannot switch between 4 positions, and there is a problem in that they cannot meet the demand for 4-position switching. Ta. For example, in addition to two-position switching that allows controlled feed of the table in both forward and reverse directions, a differential circuit is configured to provide a difference in the pressure-receiving area of the piston 4, as shown in Figure 1, for rapid feed of the table 2. There is a need for a device capable of switching between four positions as shown in FIG. 2, including a switching position for stopping the daple and a switching position for stopping the daple. However, as mentioned above, 4-position switching is not possible with a 4-poppet valve, so in such a case, another switching valve must be added and used, which complicates the circuit configuration. , and there were also problems such as increased costs.

The present invention was made against this background, and the object of the present invention is to provide a 4-position switch which can be switched between 4 positions.
The purpose is to provide a poppet valve.

The gist of the present invention, which has been made to achieve such objects, is to provide a main body having a boat P for supplying pressure fluid, two boats A and B connected to a fluid actuator, and a boat R for discharging fluid. Between boat 1 and PA in the valve body, boat PB
first to fourth poppets that open and close each flow path by fluid pressure in each of the first to fourth valve chambers formed in each flow path communicating between the port AR, the port AR, and the boat BR. A first and second valve that can respectively control each pilot flow path that communicates between the boat P and the valve body 1 of the first and second valve chambers to the rear side of the valve body. A 2-position electromagnetic switching valve is provided in each pilot fl'iE path that communicates the 2-position electromagnetic 9-hole valve, the boat P, and behind the poppet valve bodies of the third and fourth valve chambers, and the pilot flow two two-position pilot operated switching valves capable of controlling said pylon 1 flow path via pilot fluid pressure supplied to a two-position FFI magnetic switching valve capable of controlling said pylon flow path; By switching the second two-position electromagnetic switching valve, the position where each bow]- can be communicated with the position where the bow 1-
I) 13 questions and the position where communication can be made between port AR, and the position where communication can be made between boat h P A and boat BR.
The present invention is configured so that it can be switched between a position where the boat PAB is connected to the boat PAB and a position where the boat PAB is disconnected and the boat PAB is disconnected.

An embodiment of the present invention will be described in detail below based on the drawings.

As shown in FIG. 3, the four-poppet valve includes a main valve 16 having poppet valve bodies in first to fourth valve chambers 8.10 and 12.14 formed in the main valve body 7, and a solenoid 1.
8 (SOLa), solenoid 20 (SOLb
), a solenoid valve device 26 incorporating two sets of two-position solenoid switching valves each having a spool 22, 24, and
The connecting member 28 has a pair of two-position pilot operated switching valves (not shown) and is formed with a flow path that communicates the main valve 16 and the electromagnetic valve device 26. FIG. 4 is a circuit diagram showing this four-poppet valve.

The main valve body 7 has a port 1-A113 of 2111 connected to the port P1 fluid actuator that supplies pressure fluid.
and boats R for discharging fluid; boats 1 to 13R;
A first valve chamber 8 is located between the flow passages 30 and 32 that communicate with each other.
The second valve chamber 10 is in the flow path 34.36 that communicates between boat 1 and A R, and the flow path 38.4 that communicates between boat PB.
A third valve chamber 12 is provided between the ports PA, and a fourth valve chamber 14 is provided between the flow paths 42 and 44 communicating between the ports PA. First to fourth poppet valve bodies 46, 48, 50, 52 are slidably fitted into each valve chamber, and when the respective flow paths can be disconnected from each other, A compression coil spring 54, 56, 58, 60 is attached to the back of the poppet valve body for biasing the poppet valve body in a direction that blocks the flow path. 62 is a branch passage as a pilot flow passage communicating with the boat P via the check valve 64;
The branch passage 65 of the flow passage 38 passes through the check valve 66 and the throttle 67, and the branch passage 68 of the flow passage 42 passes through the check valve 6.
9 through an aperture 70. 72 is boat D
Although the discharge path communicates with R, it may be connected to a flow path that communicates with bows 1 to R.

Pilot flow paths 74.76.78.80 are formed on the rear side of the valve chambers 8.10.12.14, and the flow paths 74.7G and 78.8O are connected to each other. A pilot flow path 82.83 formed in the member 28 communicates with a pilot flow path 84.85 branched from the flow path 82.83. Further, the branch passage 62 and the discharge passage 72 of the main valve body 7 are connected to the pylon 1-flow passage 86 in the coupling member 28, respectively.
, are connected to the discharge path 87.

1= Inside the coupling member 28 are two-position pilot operated switching valves 90, 92 shown in FIG. 4 (not shown in FIG. 3).
is provided. The switching valve 90 is provided in the pilot flow path B4 connected to the flow path 78, and in the normal position, communicates both flow paths, and in the pilot flow path 9 branched from the flow path 82.
When pilot pressure is applied via 6, communication is cut off. The switching valve 92 is installed between the pylon 1 and the flow path 85, which are connected to the flow path 80, and similarly to the above, in the normal position, both flow paths communicate with each other, and the switching valve 92 connects the pylon 1 to the flow path 85 through the pilot flow path 94 branched from the flow path 83. - Communication is cut off when pressure is applied.

Each flow path of the coupling member 28 configured in this way is connected to each pilot flow path of the electromagnetic valve device 26. That is, the solenoid valve device 26 has a pilot introduction passage 100 that introduces pilot fluid through a frontage at the joint surface of the electromagnetic switching valve body 98 to the main valve body 7 side, and a pylon 1 to an outlet passage that leads the pilot fluid to the low pressure side. 102 and pilot flow paths 104 and 106 for switching the flow direction of the pilot fluid are provided. J3, switching channels 108 and 109 are blocked. Further, sleeve members 114 and 116 are inserted into stepped holes 110 and 112 formed on both end faces of the valve body 98, respectively. Spools 22, 24 are slidably fitted inside each sleeve member 114, 116 so that the pylon 1 to flow path 104, 106 communicates with the pilot inlet path 100 and the pilot outlet path 102, respectively. It's been done. Each spool 22.24 has a bone 118.12 attached to one end.
0 biased toward one sliding end side, one spool 2
4 connects the pilot flow path 106 to the pylon 1 to the outlet path 102
The other spool 224 is in communication with the L pylon 1.
- maintained in a switching position that communicates the flow path 104 with the pilot outlet path 102; In addition, solenoid 18 (SO
La) and 20 (SOLb) can be individually slid against the biasing force of springs 118 and 120 by being excited, respectively.

Next, the operation of the embodiment having the above configuration will be explained.

In addition, BR (1), AR (2), P in Figures 4 to 7
B (3) and PA (4) are the BR of each boat, respectively.
1 shows first, second, third, and fourth poppet valves each including a valve chamber and a poppet valve body provided in a flow path that communicates between A and R, between A and R, between PB, and between PA.

In Figures 3 and 4, 5OLa, 5OLb are in a non-excited state, and a portion of the pressure fluid supplied to the boat P passes through the branch passage 62, check valve 64, and flow passage 86 as pilot fluid. It is supplied to the pilot introduction path 1oo, but by the spools 24 and 22 of the two-phase electromagnetic pilot operation switching valve,
Pylon! - Since the communication with the fluid switching path 104.106 is cut off, all the pilot flow paths connected to the back side of the poppet valve body of each valve chamber 8.10.12.14 via the pilot flow path 104.106 are disconnected. It is blocked. on the other hand,
Pilot passages 104 and 106 are from pylon 1 to outlet passage 1
02, the pressure fluid behind the poppet valve element of each valve chamber can be led to the boat DR on the low pressure side, so that the pressure fluid supplied from the boat P to the flow channel 44 is communicated with the discharge channel 87.72. Push up the valve body 52 to open it, and roughly open the flow path 42.
36 and pushes up the poppet valve body 48 to open it.

Similarly, the valves 1 to 50 and 46 are also opened. At this point, communication is established between each baud PABR. That is, it performs the PABR connection switching function shown at switching position 9 in FIG.

Next, FIG. 5 shows the case where 5OLb is excited.

When s o l-b is excited, one of the spools 24 moves once against the force of the spring 118, and the flow path 100 is switched to communicate with the pylon 1 to the flow path 106, and the first valve room 4
The fluid from pylon 1 is introduced to the back side of the valve body of 6, and the flow path 8.
, the fluid from the pylon 1 is introduced behind the valve body of the fourth valve chamber 1/I through the flow ff180, while the pilot fluid behind the valve body in the second and third valve chambers 10.12 are the paths of flow path 76.83.104.102.87.72, flow path 78, switching valve 90, flow path 84.102.87.
It is led out to the boat DR side through the route 72. As a result, the first valve body 46 shuts off the connection between the boat BR, the fourth valve body 52 shuts off the connection between the boat PA, and the second and third valve bodies 48
．． 50 connects boats AR and boats 1 to PB, respectively, and switches the h position shown in FIG. 2 l! Qin ability.

Note that when each valve body closes, the fluid pressure trapped in the flow path communicating with each boat PABR is caused by the check valve 64, 66, 6
9 and the throttle 67.7o, and are released to the pilot flow path 62 side.

FIG. 6 shows a state in which 5OLb is demagnetized and 5OLa is excited. When 5OLa is excited and the other spool 22 is slid, the flow path 100 is switched into communication with the switching flow path 104,
The pilot fluid is introduced behind the valve body in the second valve chamber 1o, passes through the flow path 104, passes through the pilot operated switching valve 90° flow path 84.78, and enters the third valve chamber 12. Pilot fluid is introduced behind the valve body of the first and fourth valve chambers 8.14, while pilot fluid behind the valve body in the first and fourth valve chambers 8.14 is led out to the boat DR side. As a result, the second valve body 48 connects ports h A R, and the third valve body 50 connects ports P
The first and fourth valve bodies 46 and 52 respectively allow communication between boats 1 and BR and between boats PA, and perform a switching function of position e shown in FIG. 2.

FIG. 7 does not show the combination when both 5OLa and 5OLb are excited. Excite 5OLa 5SOLb and spool 22.2
4, the introduction path 100 becomes the pilot flow path 104.
．． 106, a pilot flow path is introduced behind the valve body in the first and second valve chambers 8.10, and a branch flow path 94. ．． By switching the fluid pressure pilot operation switching valve 90192 to the closing side by the pilot fluid pressure applied by the pilot fluid pressure applied by the pilot fluid pressure 96, the third and fourth valve chambers 12.
The pilot fluid in the valve chamber 12.14 behind the valve body is blocked, and at the same time the pilot fluid behind the valve body in the valve chamber 12. (not shown in FIG. 3) is led out to the bow 1 to DR side. As a result, the first and second valve bodies 46 and 48 respectively cut off the connection between the boat BR and the boat AR, and the third and fourth valve bodies 50
．． Reference numerals 52 and 52 connect the boats PAB to each other and provide a switching function for the f position (not shown in FIG. 2).

The following Table 1 shows the excitation (ON) of 5OLa and 5OLb,
The open/close states and switching positions of each poppet valve corresponding to the de-energized (OFF) combination are shown.

Table 1 As described above, according to this embodiment, the four-position switching shown in FIG. 2 is possible. Therefore, in addition to the aforementioned surface grinder, the 4-poppet valve, which can be switched between forward and reverse control υII feed positions for other mechanical equipment, fast-forward position for configuring a differential circuit, and stop position, is compactly constructed. can be done.

Further, by changing the combination of energization and de-energization of 5OLa1SOLb, the four-position switching arrangement shown in FIG. 2 can be freely changed. Furthermore, for the position switching, two
Since two hydraulic pilot-operated switching valve devices are also used, only two electromagnetic pilot-operated switching valve devices are required, and as a result, the configuration of the solenoid control circuit can be simplified.

Although one embodiment of the present invention has been described above, the present invention is not limited to such embodiment in any way, and it goes without saying that it can be implemented in various forms without departing from the gist of the present invention. be.

As described in detail above, according to the present invention, four poppet valves are provided in each flow path communicating between port I and PA, between PB, between AR, and between BR, and which open and close each flow path. The first and second two-position electromagnetic switching valves,
The first and second
By switching the switchover valve, each
The combination of opening and closing of the valve can be changed, thereby enabling four-position switching.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a differential circuit including a PAB connection switching position of a switching valve. Fig. 2 is a J symbol diagram showing the switching function in an embodiment of the present invention, Fig. 3 is a partial sectional top view of the embodiment, and Fig. 4 is a 5OLb
, 5OLa are both de-energized, FIG. 5 is a circuit diagram showing S Q L, l+ excitation, and 5OLa de-energized. FIG. 6 is a circuit diagram showing 5OLb de-energized and S Ol-a excitation. Circuit diagram, i￥! Figure 7 shows 5OLb and 5OLa.
FIG. 3 is a circuit diagram showing a state where both are excited. 7 Main valve body 8 First valve chamber 10 Second valve chamber 12 Third valve chamber 14 Fourth valve chamber 16 Main valve 18 .20...Solenoid 26...Solenoid valve device (electromagnetic operation switching valve) 30.32.
34.36.38.40, 42.44...Flow path 46...First poppet valve body 48...Second poppet valve body 50...Third poppet valve body 52... Fourth poppet valve body 74.76.78.80, 82.83.84.85.8
6.94.96.104.106... Pilot flow path 00.92... 2-position pilot operation switching valve 100.
...Pilot introduction path (pilot flow path) 102...
Pilot outlet path (Byron 1 to flow path) Agent: Patent attorney Tsutomu Ashioki (1 person) Figure 1 Figure 2

Claims (1)

[Claims] Between ports PA and between ports PB in a main valve body having a boat P that supplies pressure fluid, two boats A1B that connect to a fluid actuator, and a boat R that discharges fluid;
In each of the first to fourth valve chambers formed in each of the flow channels that communicate between the boats AR and between the boats BR, first to fourth poppet valve bodies that can open and close each flow channel by fluid pressure are disposed. The first and second two positions are capable of controlling the installed main valve, the boat P, and each bailey rower 1 that connects the poppet 1 of the first and second valve chambers to the rear side of the valve body, respectively. Each pylon that communicates the solenoid switching valve, the boat P, and the valve body 1 of the third and fourth valve chambers to the back of the valve body] is provided in the flow path together with the 2-position electromagnetic switching valve, and the pilot flow path is connected to the pilot flow path. two two-position pilot operated switching valves capable of controlling the pilot flow path via pilot fluid pressure supplied by a controllable two-position electromagnetic switching valve, a first and a second two-position electromagnetic switching valve; By switching the switching valves, the positions where each boat can communicate, the positions where boats 1-P can communicate, the positions where boats AR can communicate with each other, the positions where communication can be avoided between boats PA and boats BR, and boats PAB
1. A four-poppet valve characterized in that it is configured to be able to be switched to a position in which the valve 1-R is communicated with the valve 1-R and the valve 1-R is cut off.