JPS5852081B2 - pressure fluid control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure fluid control device that is used in construction machinery, truck cranes, etc., and performs remote and manual operation of actuators.

Conventionally, there is a remote control device for a pressure fluid device disclosed in Japanese Patent Application No. 52-105208 and its drawings, and a conventional pressure fluid control device using this will be explained based on FIGS. 1 to 4. do.

In the pressure fluid control circuit shown in FIG. 1, 1 is a pump as a pressure fluid source, 2 is an electromagnetic flow control valve, 3.4, 5.
6 is an electromagnetic directional control valve with a manual operation device.

The electromagnetic flow control valve 2 is provided between the electromagnetic directional switching valves 3, 4, 5.6 and the pump 1, and controls the flow rate supplied from the pump 1 to the electromagnetic directional switching valve according to the excitation force of the electromagnet 35 for control. It is something to control.

The electromagnetic directional control valves 3, 4, 5.6 each have a first actuator W1, a second actuator X1, a third actuator Y
Pressure fluid is supplied to and discharged from the first and fourth actuator Z.

These electromagnetic directional control valves 3, 4, 5.6 are in neutral position 3a
, 4a.

5a, 6a, left and right switching positions 3c, 3b; 4c
.

4b; 5c, 5b; 6c, 6b, and left and right switching electromagnets 3e, 3d; 4e, 4d; 5e.

5d: 6e, held in neutral position when 5ct is not excited.

Also, at this time, manual operation devices 3f, 4f, 5f, 6f
By operating , the left and right switching positions can be operated.

Each electromagnetic directional valve 3, 4, 5.6 has its electromagnet 3d
.

When 4d, 5d, and 6d are excited, the right switching position 3b,
Switch to 4b, 5b, 6b, electromagnet 3e.

When 4e, 5e, 6e are energized, the left switching position 3c
, 4c, 5c, and 6c, and supply and discharge pressure fluid to each actuator.

More specifically, the electromagnetic flow control valve 2, as its cross section is shown in FIG.
It is made up of.

The flow rate detection unit 20 is attached to a hole 14a bored between an unloading passage 25 and a bridge passage 28 provided in the main body 14, and includes a socket 16 having an inner hole 19, and the inner hole 19.
a flow rate detection valve 20a slidably inserted into the spring chamber 1 formed between the flow rate detection valve 20a and the lid member 17a;
8 and a spring 17 mounted in the spring chamber 18 and pressing the flow rate detection valve 20a, and the flow rate detection valve 20
A is provided with a throttle 22 that communicates the bridge passage 28 and the unload passage 25, and a throttle 18a that communicates the bridge passage 28 and the spring chamber 18.

When one of the electromagnetic directional switching valves is operated and the unloading passage 26 (see FIG. 1) is shut off, the discharge fluid of the pump 1 flowing into the unloading passage 25 flows through the flow rate detection unit 20.
The flow through the restriction 22 into the bridge passage 28 is allowed.

When the flow rate from the unloading passage 25 to the bridge passage 28 increases, the fluid in the spring chamber 18 is discharged to the bridge passage 28 via the throttle 18a, so the flow rate detection valve 20a moves to the right and moves the flow rate between the unloading passage 25 and the bridge passage 28. The degree of communication with 28 is increased.

The flow rate control section 23 has a main valve 23a'E slidably inserted into the inner hole 31 of the socket 43 installed in the hole 14b opening into the unload passage 25.

The right end of the main valve 23a receives the fluid pressure in the unload passage 25, and the left end is in contact with a spring 32, and the spring chamber 33 of the spring flows through the throttle 29 into the unload passage 25. is connected to.

The spring chamber 33 also communicates with the valve chamber 34 of the poppet valve 24a of the electromagnetic valve section 24 via the throttle 30.

When the fluid in the spring chamber 33 is discharged to the bridge passage 2B, the main valve 23a of the flow rate control unit 23 moves to the left and directs some of the fluid in the unload passage 25 to the hole 3 provided in the inner hole 31.
It is designed to be discharged into a discharge passage 15 via 1a.

The electromagnetic valve section 24 includes a poppet valve 24a which is provided in a poppet valve chamber 34 and opens and closes between the spring chamber 33 and the bridge passage 28; A control electromagnet 35 that has an oil-immersed iron core 36 and is energized when energized to apply a pressing force to the poppet valve 24a; and an iron core 38 that is arranged so as to be in contact with or be separated from the iron core 36. The lock release electromagnet 37 has a spring 39 between the iron core 38 and the cover 40.

The poppet valve 24a of the solenoid valve section 24 receives fluid pressure in the spring chamber 33 at its right end and is pushed to the left, and the excitation force of the control electromagnet 35 is applied to the poppet valve 24 through the iron core 36.
a'& press to the right.

Furthermore, since the chamber surrounding the iron core 36 is connected to the bridge passage 28 via the poppet valve chamber 34, the poppet valve 24a is pushed to the right by the fluid pressure within the bridge passage 28.

That is, the poppet valve 24a has a pressure-receiving area corresponding to the opening area of the valve seat on which the tip of the poppet valve 24a seats and leaves, and the fluid pressure in the spring chamber 33 acts on this area from the right side, and the fluid in the bridge passage 28 Pressure is applied from the left side, and when the lock release electromagnet 37 is excited and the control electromagnet 35 is excited, a pressing force corresponding to the excitation force of the control electromagnet 35 is applied.

Therefore, if the pressing force due to the fluid pressure in the spring chamber 33 becomes stronger than the sum of the pressing force due to the fluid pressure in the bridge passage 28 and the pressing force due to the excitation force of the control electromagnet 35, the poppet valve 24a will move to the left. and connect the spring chamber 33 and the bridge passage 28.

Now, assuming that the fluid pressure in the bridge passage 28 is P1, the fluid pressure in the spring chamber 33 is P2, and the pressing force due to the excitation of the control electromagnet 35 is F, the relationship of P l +F<P 2, that is, P
2-The relationship PI>F exists.

That is, when the excitation force of the control electromagnet 35 is determined, the pressure difference between the unload passage 25 and the bridge passage 28 connected to the spring chamber 33 corresponds to the pressing force F due to the excitation of the control electromagnet 35. This pressure difference is maintained at a constant difference corresponding to the pressing force F even if the fluid (load) pressure in the supply passage 27 connected to the bridge passage 28 changes, and acts as a so-called pressure compensation.

Therefore, by changing the pressing force F, that is, the excitation force of the control electromagnet 35, the supply flow rate to the actuator can be controlled according to the excitation force, regardless of the load pressure in the supply passage 27.

The spring 39 of the electromagnet 37 for unlocking presses and holds the poppet valve 24a of the solenoid valve section 24 in the right position.When the electromagnet 37 is energized, its iron core 38 moves to the left.
The spring 39 is compressed to release the poppet valve 24a from being pressed.

Since the pressing force of the spring 39 is set to be equal to or higher than the maximum pressing force of the control electromagnet 35, the flow rate control valve 2 maintains the maximum flow rate of the unload passage 25 when the unlocking electromagnet 37 is demagnetized. The main valve 23a is locked (so as to supply the maximum flow rate to the electromagnetic directional control valve).

That is, the electromagnetic flow control valve 2 has an electromagnet 3 for its control.
5 and the unlocking electromagnet 37 are demagnetized.
It is locked by the spring 39 and supplies the entire amount of pressure fluid from the pump 1 to the electromagnetic directional control valves 3°4.5.6. At this time, when all the electromagnetic directional control valves are in the neutral position, the pressure fluid is The entire amount passes through the unload passage 26 and is transferred to the tank 7.
(See Figure 1).

In this state, when one of the electromagnets of the electromagnetic directional control valve is energized to switch it to either the left or right position, and the electromagnet 37 for unlocking the electromagnetic flow control valve 2 is energized, the spring 39 is compressed and presses the poppet valve 24a. The pressure fluid in the unload passage 25 pushes open the main valve 23a and flows from the passage 15 to the tank 7.

In this state, when the control electromagnet 35 is excited,
Pressure fluid in the unload passage 25 is supplied to the electromagnetic directional control valve in accordance with the excitation force.

The electromagnetic directional control valves 3, 4, and 5.degree. 6 with manual operation devices each have the same structure, and specifically, a cross section of one of them is shown in FIG.

This electromagnetic directional switching valve includes a main body 50, a spool 51 slidably fitted into an inner hole 52 provided in the main body 50, switching electromagnets fixed to both sides of the main body 50 for moving the spool 51, and E. and a manual operating device F provided between this electromagnet and the main body 50.

The main body 50 of the electromagnetic directional control valve is provided with a supply passage 27 to which the discharge side of the pump 1 is connected via the bridge passage 28 of the electromagnetic flow control valve 2. This passage 27 is connected to a check valve 53 for load check and the bridge. Inner hole 5 via passage 54
It is open to 2.

A spool 51 is slidably fitted into the inner hole 52.
The spool 51 is operated by a switching electromagnet when no operation command is given to either E or manual operating device F.
It is stopped by springs 57 and 58 in the state shown in FIG. 3 (neutral position).

The spool 51 has a land portion 60, 60a: 61°61
a:62 and annular groove 64, 64a, 65°65a:6
It is equipped with 6,66at.

In the position shown, the annular groove 64 . 64 a communicates with a discharge passage 68 leading to the tank 7 .

Lands 60.60a each block ports 55,56 that connect to actuators.

Land 61. 613 blocks the bridge passage 54 from the groove 70.70a forming the unload passage 26 in FIG.

Further, the annular groove 66.66a also has the grooves 70°70a, 71.
At the same time, an unload passage 26 connected to the unload passage 25 is formed.

When the electromagnet E for switching is excited, its iron core 75
moves to the right, causing the spool 51 to move against the pressing force of the spring 58.

When the spool 51 moves to the right, the groove 70°71;
0a, 71, that is, the unload passage 26 is the land 61
, 62, and the port 55 is connected to the discharge passage 68 by an annular groove 64, and the port 56 is connected to the bridge passage 54 by an annular groove 65a.

At this time, the fluid discharged from the pump 1 is supplied to the unload passage 25 of the electromagnetic flow control valve 2, the flow rate detection section 20, the supply passage 27, the check valve 53 of the electromagnetic directional switching valve, the bridge passage 54, and the port 5.
6 to the actuator.

On the other hand, the discharged fluid from the actuator is discharged to the tank 7 via the port 55 and the discharge passage 68 of the electromagnetic directional control valve.

When the electromagnet is excited, its iron core 76 moves the spool 51 to the left.

When the spool 51 moves to the left, ports 55 and 56
The connection state is the opposite of the above case.

That is, the port 55 is connected to the pump 1 and the port 56 is connected to the tank 7. The discharge fluid of the pump 1 is supplied to the actuator through the port 55, and the discharge fluid of the actuator is discharged to the tank 7 through the port 56.

The manual operating device F includes an operating lever L, two rods 73 and 74 that are pin-coupled to the operating lever L and have tapered parts 80 and 81 at their tips, and tapered parts 80 and 81 that are threadedly coupled to the right end of the spool 51. The pressing body 82 has slopes 85 and 86 corresponding to the slanted surfaces 85 and 86.

When the operating lever L is operated in the direction of the arrow in the figure, the rod 74 descends, and its tapered portion 81 abuts the slope 86 to move the spool 51 to the left together with the pressing body 82.

Further, when the operating lever L is operated in the direction of arrow B, the rod 73 is lowered to move the spool 51 to the right.

The above-mentioned electromagnetic flow control valve 2 and electromagnetic directional switching valve 3.4,
5. In order to give an excitation command to each electromagnet in 6.
An electrical circuit is provided as schematically shown in the figure.

In FIG. 4, reference numeral 90 denotes an operation panel, and the operation panel 90 includes a first command transmitter for giving an excitation command to each of the electromagnets of the electromagnetic directional control valve and the electromagnet 37 for unlocking the electromagnetic flow control valve 2. 91 and a second command transmitter 92 for giving an excitation command to the electromagnet 35 for controlling the electromagnetic flow control valve 2.

Note that the first command transmitting section 91 includes a push button 93e as a first operating member.

93d; 94e, 94d: 95e, 95d;
96e.

96d is disposed, and an operating lever 98 as a second operating member for adjusting the excitation force of the electromagnet 35 is installed in the second command transmitting section 92.

The pushbuttons 93e and 93d are used to give an excitation command to the electromagnets E and D of the electromagnetic directional control valve 3, that is, 3e and 3d.

Similarly, push buttons 94e, 94d; 95e, 95d; 96
e and 96d are electromagnets E of the electromagnetic directional control valves 4 and 5.6, respectively.
, D or 4e.

It gives an excitation command to 4ct, 5e, 5ct, 6e, and 6ci.

When the operating lever 98 is operated, it applies an excitation signal to the electromagnet 35 for controlling the electromagnetic flow control valve 2, and changes the excitation force of the electromagnet 35 depending on the amount of operation.

In FIG. 4, reference numeral 200 is a control panel connected to the operation panel 90 via a cable 150, and the control panel 200 transmits excitation signals from the push buttons to the electromagnets and electromagnets of the electromagnetic directional control valves 3 to 6. A first circuit 201 that transmits to the electromagnet 37 for unlocking the flow control valve 2 and the operating lever 9
8 to the electromagnet 35 for controlling the electromagnetic flow control valve 2.

Reference numerals 110, 135, and 137 in FIG. 4 are ink clock switches, which are turned on by an excitation signal and cut off by a demagnetization signal.

Further, 107 indicates a power source.

Although FIG. 4 only shows the interlock switch 110 for the electromagnet 3e for convenience, the interlock switches (not shown) for other electromagnets are also similar.

Next, the operation of this conventional device will be explained.

The electromagnetic directional control valves 3, 4, 5.6 are in the neutral position, and the push button (first operating member) 93e of the operating panel 90 is pressed.

93 d s 94 e...When neither 96d1 nor the operating lever (second operating member) 98 is operated, the discharge fluid of the pump 1 is transferred to the electromagnetic flow control valve 2 and each electromagnetic directional switching valve. 3, 4, 5.6 are discharged into the tank 7 via each unload passage 25.26.

Further, at this time, since the electromagnet 37 of the electromagnetic flow control valve 2 is demagnetized, the poppet valve 24a receives the pressing force of the spring 39 to hold the main valve 23a in a locked state and maintain the maximum flow rate of the passage 25.

In this state, the first operating member, for example, the pushbutton 93e
When is operated, the excitation signal from this operation is sent to the first circuit 2.
01 to interlock switches 137 and 110.

Therefore, the unlocking electromagnet 37 is energized, and the iron core 38 presses the spring 39 to the left to unlock the main valve 23a.

Further, the switching electromagnet 3e is excited, and the spool 51 is moved to the right by the exciting force.

As the spool 51 moves to the right, its lands 61, 62 block the grooves 70, 70a, 71 forming the unload passage 26, respectively, and connect the port 55 connected to the actuator to the discharge passage 68. , port 56 to bridge passageway 54.

By blocking the unload passage 26, the discharge side of the pump 1 is
8, the supply passage 27 is connected to the actuator via the port 56 of the electromagnetic directional control valve 3.

Next, when the second operating member (operating lever) 98 is operated,
A signal resulting from this operation is applied to the interlock switch 135 via the second circuit 202, and the electromagnet 35 for controlling the electromagnetic flow control valve 2 generates an excitation force according to the strength of the signal.

The excitation force of this electromagnet 35 is applied to the poppet valve 2 of the solenoid valve section 24.
4a, the fluid pressure in the spring chamber 33 of the flow rate control section 23 increases, and the main valve 23a blocks off the unload passage 25 and the discharge passage 15, and the fluid pressure in the unload passage 25 is transferred to the electromagnet 35. Increase according to the excitation force.

Therefore, the discharge fluid of the pump 1 flowing into the unload passage 25 flows into the supply passage 27 via the flow rate detection section 20.

Therefore, the flow rate to the supply passage 27 changes according to the output signal of the second command transmitter 92 by operating the operating lever 98, and the operating speed of the actuator changes.

When the push buttons and operating levers of the operating panel 90 are not operated, that is, when operating manually, when the operating lever L of the manual operating device F is operated in the direction of arrow B in FIG. 3, the spool 51 moves to the right. , the unload passage 26 is blocked and the ports 55, 56 are connected to the discharge passage 68 and the bridge passage 54, respectively.

At this time, the electromagnets 35 and 37 of the electromagnetic flow control valve 2 are demagnetized, so the locking spring 39 presses the poppet valve 24a of the electromagnetic valve section 24 via the iron cores 38 and 36, thereby controlling the flow rate. The section 23 does not operate and causes the discharge fluid of the pump 1 flowing into the unloading passage 25 to flow into the entire supply passage 27 .

Therefore, the flow rate supplied to the actuator connected to the electromagnetic directional switching valve can be adjusted by the amount of operation of the operating lever L.

The conventional device has been described in detail above, but to summarize the above explanation, the conventional device includes an electromagnetic flow control valve 2 that is connected to a pressure fluid source 1 and controls the supply flow rate according to the excitation force of a control electromagnet 35; a spring 39 provided on the electromagnetic flow control valve 2 and locking the electromagnetic flow control valve 2 so as to engage with the control electromagnet 35 to supply the entire amount of pressure fluid from the pressure fluid source 1; a lock release electromagnet 37 that releases the electromagnet 39 from engagement with the control electromagnet 35 and unloads the electromagnetic flow control valve 2; On-off type electromagnetic directional switching valves 3, 4, 5.6 that switch the supply and discharge paths of the actuator by excitation, and the electromagnetic directional switching valves are provided with lever operation to switch the supply and discharge paths and adjust the flow rate. a manual operating device F, a first operating member (push button) that outputs a constant electrical signal when operated, a second operating member (operating lever 98) that outputs an electrical signal according to the amount of operation; a first circuit 201 that transmits a signal from the operating member to the switching electromagnet E and the unlocking electromagnet 37; and a second circuit that transmits a signal from the second operating member to the control electromagnet 35. 202, and can select between remote operation and manual operation.

However, when performing electrical remote control, this conventional device incorrectly operates the first operating member (push button) and the second operating member (operating lever), that is, the second operating member is operated and then the second operating member is operated. However, there is a problem in that if the actuator is erroneously operated, accurate remote control of the actuator cannot be performed (a malfunction occurs).

In other words, both the first operating member and the second operating member are not operated (the electromagnetic directional control valves 3, 4, 5, and 6 are in the neutral position, the electromagnetic flow control valve 2 is locked, and the pressure fluid source P is not operated). state in which the entire amount of pressure fluid is supplied to the electromagnetic directional control valves 3, 4° 5.6 via the electromagnetic flow control valve 2)
First, when the second operation member is operated, the control electromagnet 35 is excited in accordance with the amount of operation, and the poppet valve 24a of the electromagnetic directional control valve is pressed by the excitation force.

At this time, the poppet valve 24a is also pressed by the spring 39.

When the first operating member, for example, the push button 93e is operated, the lock release electromagnet 37 is excited, and its attractive force compresses the spring 39, causing the poppet valve 24 of the spring 39 to be compressed.
Release the pressing force on a.

However, at this time, the poppet valve 24a is connected to the control electromagnet 3.
5, and pressure fluid is supplied to the electromagnetic directional switching valve.

In this state, when the switching electromagnet 3e corresponding to the push button 93e is excited, the electromagnetic directional switching valve 3 tries to switch due to its attractive force, but the electromagnetic directional switching valve 3 is connected to the pressure fluid source P. Since pressure fluid is supplied, a flow force is generated within the switching valve 3, and the electromagnet 3e for switching is a small on-off type, and its suction force is caused by the sliding resistance within the switching valve 3 and the switching electromagnet 3e. Since it only overcomes the return spring force, if a flow force is generated in the same direction as these sliding resistance and return spring force, the sum of these will oppose the attractive force of the switching electromagnet 3e, and the magnitude relationship between the two will be The switching valve 3 may or may not be switched depending on the switching state.

Even if the electromagnetic directional control valve 3 switches, the switching electromagnet 3e
When the attractive force of the force overcomes the opposing force,
This switching causes the actuator to move suddenly, but the operator cannot predict when the actuator will suddenly move.

In addition, if the electromagnetic directional switching valve 3 does not switch and the actuator does not operate, the flow rate supplied from the pressure fluid source P to the switching valve 3 is too large, so reducing the operating amount of the second operating member will cause the switching to occur. When the flow rate supplied to the valve 3 decreases and the flow force becomes smaller, and the sum of the sliding resistance and return spring force in the switching valve 3 and the flow force becomes smaller than the attraction force of the switching electromagnet 3e, The switching valve 3 is switched.

However, when a certain amount of pressure fluid is being supplied from the electromagnetic flow control valve 2 to the electromagnetic directional switching valve 3, the attraction force of the switching electromagnet 3e becomes relatively larger than the opposing force. Since the switching valve 3 switches and the actuator operates, the operator cannot predict when the switching valve 3 will switch, that is, when the actuator will start operating, and the actuator will operate (malfunction) regardless of the operator's will. .

The cause of the problem in this conventional device is that the unlocking electromagnet 37 and the switching electromagnet 3e are connected to each other via the first circuit 201.
The first operating member that excites 3d, 4et4d, 5et5dt6e, and 6d and the second operating member that excites the control electromagnet 35 via the second circuit 202 are independent, and there is no relationship between them. There is no such thing.

Therefore, the present invention relates the first operating member and the second operating member so that the excitation signal is not transmitted to the first circuit 201 only when the second operating member is operated before the first operating member. Consider it a technical issue.

The technical means of the present invention for solving this technical problem is, in the conventional device described above, an input end thereof is connected to the first operating member and a second operating member, and an output end thereof is connected to the first circuit, If a signal is input by operating the second operating member before a signal by operating the first operating member is input, the excitation signal is not transmitted to the first circuit, and the signal is input by operating the second operating member. An ink clock circuit is provided which transmits an excitation signal to the first circuit when a signal is input by operating the first operating member before the first operating member is operated.

According to this technical means, even if the first operating member is operated after operating the second operating member, the interlock circuit does not transmit the excitation signal to the first circuit, so that the electromagnetic directional control valve is operated by the electromagnet for switching. is not energized and does not switch, so no malfunction of the actuator occurs.

The present invention having the above technical means has the following unique effects.

Another technical means to solve the above technical problem is to mechanically lock the first operating member and the second operating member using a link mechanism, a limiting mechanism, and a release mechanism. According to the above, it is necessary to change both the conventional operating members, and the mechanism for mechanically connecting the new operating members becomes complicated, and as the number of actuators increases, the number of first operating members also increases. However, since these two operating members are originally held in the hands of the operator for remote control, it becomes difficult to operate them.

On the other hand, in the case of the present invention, since only an electrical interlock circuit is provided, both conventional operating members can be used as is, and since only electrical connections are required, it is easy to modify the conventional device. It can be made smaller than the case using the other technical means mentioned above, and does not cause any difficulty in operation.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3 and FIGS. 5 and 6.

FIG. 5 shows an electric circuit for transmitting excitation signals to the electromagnets of the electromagnetic flow control valve 2 and the electromagnetic directional control valves 3 to 6 shown in FIGS. 1 to 3, and FIG. 6 shows the interlock circuit 9 in FIG. 5.
7 is a detailed diagram.

Note that explanations of parts that are the same as those of the conventional art will be omitted.

In FIG. 5, in a normal state in which both the push buttons as the first operating member and the operating lever 98 as the second operating member are not operated, the signals from both operating members are set to "1" and the interlock circuit 97 The respective signals when both operating members are operated are inputted to the interlock circuit 97 as "O".

The output terminal of the ink clock circuit 97 is connected to the first circuit 20.
Connected to 1.

Further, the second operating member (operating lever) 98 is configured to transmit a signal corresponding to the amount of operation to the second circuit 202 via a separate system without passing through the interlock circuit 97.

As shown in FIG. 6, the interlock circuit 97 includes a first ink clock circuit 97a1 and a second interlock circuit 97.
b It is composed of a third interlock circuit 97c and a fourth interlock circuit 97d. Each circuit is similar to the first interlock circuit 97a shown in the figure, and only differs in the input/output connection relationship.

The first ink clock circuit has a terminal to which a signal from the second command transmitter 92 (operation lever 98) is input, and a terminal to which a signal from the first command transmitter 91 (push buttons 93e, 93d) is input. NAND circuit with NAND1, NAND
2; Signal from operation lever 98 and NAND circuit NAN
AND circuits AND1 and AND2 receive output signals from DI and NAND2; and output terminal Q.

JK flip-flop circuit JK-1゜JK with Wataru
-2; The output signal of the NAND circuit NAND1.2 and the output signal of the output terminal layer of the JK flip-flop circuits JK-1, JK-2 are input, and the output terminals of the JK flip-flop circuits JK-1, JK- It is composed of input negation OR circuits ORI and OR2 connected to the reset terminal R of No. 2.

The input terminals K and set terminals S of the JK flip-flop circuits JK-1 and JK-2 are grounded, and their inputs are always "O".

The signal from the second command transmitter 92 (operation lever 98) is also input to the other second to fourth interlock circuits, and the push buttons 94e and 94d are pushed to the second interlock circuit 97b and then to the third interlock circuit 97c. Button 95e,
Push button 96e from 95d to the fourth interlock circuit.
.

Each signal is input from 96d.

Next, the first interlock circuit 97a will be explained in detail.

First, in a normal case where none of the push buttons 93e, 93d and the operating lever 98 are operated, a signal "1" is input from these push buttons and the operating lever.

Therefore, the signal "1" is input to both input terminals of NAND1 and NAND2, and the signal "O" is outputted.

Since the output signal "O" of each of the NAND circuits NAND1 and NAND2 is input to one input terminal of each of the AND circuits AND1 and AND2, both of these AND circuits AND1 and AND2 output the signal "O". .

In addition, the output signals "0" of the NAND circuits NAND1 and NAND2 are OR circuits OR1 and O whose inputs are negated.
Since it is input to one input terminal of R2, these OR circuits OR1 and OR2 both output a signal "1".

Therefore, both JK flip-flop circuits JK-1 and JK-2 have a signal "0" input to their input terminal J, a signal "1" input to their reset terminal R, and a signal "1" input to their terminal Q. At the same time, it outputs a signal "1" to the terminal bean.

In this normal state, that is, the reset state, first, the second
When the operating member (operating lever 98) is operated, the signal "O" due to this operation is output to the NAND circuits NANDI, NAND2.
These NAND circuits NANDI because they are input to one input terminal of each of them.

Both NAND2 output the signal "lJ".

This signal "1" is input to one input terminal of each of the AND circuits AND1 and AND2, but these AND circuits AND1 and AND2 each receive the signal "Mountain" from the operating lever 98 at the other input terminal. Therefore, the signal "0" continues to be output.

Further, the NAND circuit NAND1. Each output signal "1" of NAND2 is input to one input terminal of each of OR circuits ORI and OR2, and these OR circuits O
A signal "1" is input to both input terminals of R1 and OR2, but these OR circuits ORI and OR2
Since both of the inputs are negated, a signal "0" is output.

Therefore, both JK flip-flop circuits JK-1 and JK-2 have a signal "O" at their reset terminal R.
is input, but as mentioned above, the output signals of AND circuits AND1 and AND2 are "0", and this signal "
0" is input to the input terminal J, the signal "0" is output to the terminal Q, and the signal "1" is output to the terminal Q.

In this state, when the pushbutton 93e is operated, the signal "O" due to the operation of the pushbutton 93e is input to the other input terminal of the NAND circuit NAND1, but this NAND circuit NAND1 outputs the signal "1". It remains as it is.

Therefore, the AND circuit AND1 continues to output the signal "O" without any change in the two human power signals.

Therefore, JK flip circuit JK-1 maintains its previous state.

At this time, since the pushbutton 93d is not operated, and since no change occurs in the input signals of both the NAND circuit NAND2 and the AND circuit AND2, the JK flip 70 tube circuit JK-2 also maintains its previous state.

That is, in the above normal state (reset state), after the signal "0" is input by operating the operating lever 98, the signal "0" is input by operating the push button 93e or 93d.
Even if the first interlock circuit 97a is inputted, the first interlock circuit 97a continues to output the signal “O” and does not transmit the excitation signal “1” to the first circuit 201.

Also, in the above normal state (reset state), if you first operate the push button 93e, this push button 93e
A signal "0" resulting from the operation is input to the other input terminal of the NAND circuit NAND1.

Since the signal "1" from the operating lever 98 is input to one input terminal of this NAND circuit NAND1, the signal "1" is input.
" is output.

The output signal "1" of this NAND circuit NAND1 is input to one input terminal of the AND circuit AND1.

The AND circuit ANDI receives the signal “1” from the operating lever 98.
" is input to the other input terminal, so the signal "1" is input to both input terminals, and the signal "1" is output.

At this time, since the pushbutton 93d is not operated, the NAND circuit NAND2 and the AND circuit AND2 are in the previous normal state, and the JK flip-flop circuit JK-2 outputs a signal "0" to its terminal Q and sends a signal to the terminal layer. "1" is output.

The signal "1" from the terminal Q of this JK flip-flop circuit JK-2 and the output signal "1" of the NAND circuit NANDI
" is input to the OR circuit OR1, and this OR circuit OR1
Since is an input negation circuit, it outputs the signal "OJ".

Therefore, in the JK flip-flop circuit JK-1, the output signal "1" of the AND circuit AND1 is input to its input terminal J, and the signal "0" is input to its reset terminal R, so that the signal "0" is input to its terminal Q. At the same time, it outputs a signal "0" to the terminal Q.

Note that although the output signal of the terminal Q is expressed as "1", this is actually a signal synchronized with the pulse signal from the clock pulse generator 108, and is merely expressed as "1" for convenience.

In this state, when the operation lever 98 is operated, the signal "O" due to the operation of this operation lever 98 is sent to the NAND circuit NA.
It is input to one input terminal of each of ND1 and NAND2 and the other input terminal of each of AND circuits ANDI and AND2.

The NAND circuit NANDI has a signal “O” on both its input terminals.
” is input, the signal “1” is output, and this signal “
1'' is input to one input terminal of the AND circuit AND1 and one input terminal of the OR circuit OR1.

The AND circuit AND1 receives the signals "O" and "1" and outputs the signal "O".

At this time, the NAND circuit NAND2 outputs the signals "1" and "O".
is input and outputs a signal "1", and this signal "1" is input to one input terminal of the AND circuit AND2 and the OR circuit OR.
2, and the AND circuit AND2 receives the signals "0" and "1" and outputs the signal "0".
Similarly to the normal state described above, the JK flip-flop circuit JK
-2 outputs a signal "0" to its terminal Q and also outputs a signal "1" to its terminal layer.

Therefore, the OR circuit OR1 receives the signal "1" at both input terminals, but since the input is negated, the signal "O
" is output.

Therefore, although the JK flip-flop circuit JK-1 receives the signal "O" from the AND circuit AND1 at its input terminal J, the signal "O" is input to its reset terminal R instead of the signal "1". , maintains the previous state, outputs the signal "1" to the terminal Q, and also outputs the signal "1" to the terminal layer.
OJ is output.

That is, in the normal state (reset state), when the signal "O" is input by operating the pushbutton 93e or 93d, the first interlock circuit 97a sends the signal "1" (excitation signal) to the first circuit 201. introduce.

Thereafter, even if the signal "O" is input by operating the operating lever 98, the excitation signal "1" continues to be transmitted to the first circuit 201.

To reset this set state, it is sufficient to input a signal "1" to the reset terminal R of each of the JK flip-flop circuits JK-1 and JK-2.

That is, the operating lever 98, the push button 93e or 9
Return all of these operating members in the order of 3d and return to this first position.
The input signal to the ink clock circuit 97a may be set to "l".

Note that the second to fourth interlock circuits 97b.

97c and 97d also have the above first interlock circuit 9.
Same as 7a.

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

The electromagnetic directional control valves 3, 4, 5.6 are in the neutral position, and the first operating member (push button) 93e of the operating panel 90 is in the neutral position.

93d, 94e...96d, and the second operating member (operating lever) 98 are not operated The discharge fluid of the pressure fluid source (pump) 1 is supplied to the electromagnetic flow control valve 2,
Each solenoid directional valve 3, 4, 5°6 is discharged into the tank 7 via a respective unloading passage 25,26.

At this time, the electromagnet 3 for unlocking the electromagnetic flow control valve 2
7 is demagnetized, the poppet valve 24a receives the pressing force of the spring 39 to lock the main valve 23a and maintain the maximum flow rate in the passage 25.

Further, the interlock circuit 97 is in the reset state as described above.

In this state, when the push button 93e as the first operating member is operated, the terminal Q of the JK flip-flop circuit JK-1 of the first ink clock circuit 97a is activated as described above.
An excitation signal “1” is transmitted from the first circuit 201 to the first circuit 201 .

Therefore, first, the electromagnet 37 for unlocking is excited, and its attractive force pushes the spring 39 to the left, causing the main valve 2 to
3a is released and the fluid from the pressure fluid source 1 is discharged to the tank 7 via the unload passage 25 and the discharge passage 15.

Then, the switching electromagnet 3e is excited by the excitation signal transmitted from the first interlock circuit 97a via the on-delay type delay timer 105, and the spool 51 is moved to the right by its attractive force.

As the spool 51 moves to the right, its land portions 61, 62 block the grooves 70, 70a, 71 forming the unload passage 26, and connect the port 55 connected to the actuator to the discharge passage 68. and connects port 56 to bridge passageway 54.

By blocking the unload passage 26, the discharge side of the pump 1 is connected to the flow rate detection section 20 of the electromagnetic flow control valve 2 and the bridge passage 2.
8 Supply passage 27 Connected to the actuator via the port 56 of the electromagnetic directional control valve 3.

Thereafter, when the operating lever 98 as the second operating member is operated, the first interlock circuit 97a maintains the previous state as described above, and the unlocking electromagnet 37 and the switching electromagnet 3e continue to be excited.

Further, a signal corresponding to the amount of operation of the operating lever 98 is transmitted to the second circuit 202, and the electromagnet 35 for controlling the electromagnetic flow control valve 2 generates an excitation force according to the strength of the signal.

The excitation force of this electromagnet 35 is applied to the poppet valve 2 of the solenoid valve section 24.
4a, the fluid pressure in the spring chamber 33 of the flow rate control unit 23 increases, and the main valve 23a blocks off the unload passage 25 and the discharge passage 15, and the fluid pressure in the unload passage is excited by the electromagnet 35. Increase according to power.

Therefore, the discharge fluid of the pump 1 flowing into the unload passage 25 flows into the supply passage 27 via the flow rate detection section 20.

Therefore, the flow rate to the supply passage 27 changes according to the output signal of the second command transmitter 92 by operating the operating lever 98, and the operating speed of the actuator changes.

When the operating lever 98 and the push button 93e are returned to their original positions in this order, the first interlock circuit 97a is reset as described above, followed by the unlocking electromagnet 37 and the switching electromagnet 3.
e and the control electromagnet 35 are all demagnetized, and the electromagnetic directional switching valve 3 and electromagnetic flow control valve 2 return to their original states as described above.

In the normal state, if the operating lever 98 is operated before the push button 93e, the first ink clock circuit 97a maintains the reset state as described above, so the electromagnetic directional control valve 3 does not switch and the actuator does not operate.

In addition, the first operating member (push button) and the second operating member (
In the normal state in which the operating lever 98) is not operated, manual operation of the electromagnetic directional control valves 3 to 6 by the manual operating device F is the same as in the conventional case.

[Brief explanation of the drawing]

Fig. 1 is a pressure fluid control circuit diagram of the conventional device. Fig. 2 is a sectional view of the electromagnetic flow control valve of the conventional device. Fig. 3 is a sectional view of the electromagnetic directional control valve with a manual operation device of the conventional device. 5 is a schematic diagram of the electrical command transmission circuit of the conventional device, and FIG. 5 is a schematic diagram of the electrical command transmission circuit of an embodiment of the device of the present invention.
FIG. 6 is a detailed circuit diagram of the ink clock circuit in FIG. 5. 1... Pump (pressure fluid source), 2...
Electromagnetic flow control valve, 3, 4, 5, 6... Electromagnetic directional control valve, 35... Control electromagnet 37...
... Electromagnet for unlocking, 39 ... Spring D
(3a, 4a, 5d, 6d) and E (3e, 4
e, 5 e, 6 e)..."Switching electromagnet, 93e, 93d, 94e, 94d. 95 et 95 dt 96 e s 96 d・
..."-First operating member (push button), 97...
Interlock circuit, 98... Second operating member (operating lever), 201... First circuit, 202...
...Second circuit, w, x, y, z...actuator.

Claims (1)

[Scope of Claims] 1. An electromagnetic flow control valve that is connected to a pressure fluid source and controls the supply flow rate according to the excitation force of a control electromagnet, and an electromagnetic flow control valve that is provided on the electromagnetic flow control valve and that engages with the control electromagnet. a spring for locking the electromagnetic flow control valve to supply the full amount of pressurized fluid from the source of pressurized fluid; and a lock for disengaging the spring from the control electromagnet to unload the electromagnetic flow control valve. An on/off type electromagnetic directional switching valve that is connected to a release electromagnet and the electromagnetic flow control valve, and switches the supply/exhaust path of the actuator by excitation of the switching electromagnet; a manual operation device that switches the supply/discharge path and adjusts its flow rate; a first operation member that outputs a constant electric signal when operated; a second operation member that outputs an electric signal according to the amount of operation; a first circuit that transmits a signal from the operating member to the switching electromagnet and the unlocking electromagnet; and a second circuit that transmits a signal from the second operating member to the control electromagnet. In the fluid control device, input ends thereof are connected to the first operation member and the second operation member, and an output end thereof is connected to the first circuit, and a first operation member is connected to the first operation member and the second operation member.
The excitation signal is not transmitted to the first circuit when the signal due to the operation of the second operation member is input before the signal due to the operation of the second operation member is input, and before the signal due to the operation of the second operation member is input. A pressure fluid control device including an interlock circuit that transmits an excitation signal to a first circuit when a signal is input by operating a first operating member.