JPS5830969Y2 - 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 Unexamined Patent Publication No. 54-37919, and a conventional pressure fluid control device using this device is also explained based on FIGS. 1 to 5. do.

In the pressure fluid control circuit shown in FIG. 1, a pump is used as a pressure fluid source, 2 is an electromagnetic flow control valve, and 3.4.5.
6 is an electromagnetic directional control valve with a manual operation device.

:The electromagnetic flow control valve 2 is the electromagnetic direction switching 1 valve 3.4
5.6 and the pump 1, and controls the flow rate supplied from the pump to the electromagnetic directional switching valve according to the excitation force of the control electromagnet 35.

The electromagnetic directional control valves 3.4.5.6 are connected to electric actuators W1, W1, X, X, and W1, respectively. Actuator Y1 supplies and discharges pressure fluid to and from the fourth actuator 2.

- Home: Shira electromagnetic directional control valves 3.4.5.6 are in neutral position 3a, 4a.

5a = 6a, left and right switching softness 3e--3b;
' 4 c, ・4b; 5 c * 5b; 6
c-*, sb, and left and right switching electromagnets 3e, 3d,; 4e, 4a,...; 5
e.

5d; When 6e and 6d are not excited, they are held in the neutral position.

Moreover, at this time, the manual operation device 3f. 4f, 5f, 6f
1. Each electromagnetic directional switching valve 3.4.5.6 can be operated to the left and right switching positions by operating the electromagnets 3d and 4d.

When 5d and 6d are excited, the right switching positions 3b and 4b
.

Switch to 5b, 6b, ・Electromagnet 3e * 4e,
-, 5e.

When 6e is excited, the left switching position 3c, 4c., :5c
.

6c to 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 includes a socket 16 that is attached to a hole 14 a bored between an unload passage 25 and a bridge passage 28 provided in the main body 14 and has an inner hole 19 , and a socket 16 having an 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 2.
0 through a restriction 22 into the bridge passage 28.

When the flow rate from the unload 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 connects the unload passage 25 and the bridge. The degree of communication with passageway 28 is increased.

The flow rate control section 23 has a main valve 23a 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 has a spring 32.
are in contact with each other, and the spring chamber 33 of the spring communicates with the unload passage 25 via the throttle 29.

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 into the bridge passage 28, 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 provided in the inner hole 31. 3
It is designed to be discharged into a discharge passage 15 via 1a.

The electromagnetic valve section 24 is connected to a poppet valve 24a that 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 has an oil-immersed iron core 36 into which pressure fluid is introduced, and is energized when energized to apply a pressing force to the poppet valve 24a. It consists of an electromagnet 37 for unlocking, which has an iron core 38 arranged therein and a spring 39 between the iron core 38 and a 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.
Press a 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.

In other words, 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. Fluid pressure acts from the left side, and when the unlocking 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, when 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 Move to the left and connect the spring chamber 33 and the bridge passage 28.

Now, if the fluid pressure in the bridge passage 28 is Pl, the fluid pressure in the spring chamber 33 is Pl, and the pressing force due to the excitation of the control electromagnet 35 is F, then pl+F (the relationship between Pl, that is, Pl-
A relationship of Pl>F exists.

That is, when the excitation force of the control electromagnet 35 is decreased, the pressure difference between the unload passage 25 and the bridge passage 28 connected to the spring chamber 33 becomes equal to the pressing force F due to the excitation of the control electromagnet 35. Even if the fluid (load) pressure in the supply passage 27 connected to the bridge passage 28 changes, this pressure difference is maintained at a constant difference corresponding to the pressing force F (so-called pressure compensation). It's working.

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

The spring 39 of the lock release electromagnet 37 suppresses and holds the poppet valve 24a of the electromagnetic valve section 24 in the right position, and when the electromagnet 3T 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. (6) to lock the main valve 23a (so as to supply the maximum flow rate to the electromagnetic directional control valve) 6 In other words: The electromagnetic flow control valve 2 includes an electromagnet 35 for controlling the electromagnet 35 and an electromagnet for unlocking the electromagnet 35. 37 is demagnetized, it is self-locked by the □ spring 39 and supplies the entire amount of pressure fluid from the pump 1 to the electromagnetic direction switching valves 3°, 4', and 5.6; When all of the switching valves are in the neutral position, the entire amount of pressure fluid is discharged from the tank 7'' through the unload passage 26 (see Figure 1). When the electromagnet 37 for unlocking the electromagnetic flow control valve 2 is energized and switched to either the left or right position, the spring 39
is compressed and presses the poppet valve 24a (so that the pressurized fluid in the pilot passage 25 pushes open the main valve 23a and flows from the passage 15 to the tank 7).

When the electromagnet 35 for J control is excited in this state □, the pressure fluid in the unload passage 25 is supplied to the electromagnetic directional switching valve according to the excitation force of □.

The electromagnetic directional valve 3, 4.5°6 with manual operation device is
Each of the four □ has the same structure, and specifically, the cross section of one of them is shown in Fig. 3 □.

This electromagnetic directional control valve includes a main body 50 and a spool 51 slidably fitted into an inner hole 52 provided in the main body 50.
, a switching electromagnet E fixed to both sides of the main body 50 for moving the spool 51, and this electromagnet and the main body 5.
0 and a manual operating device F provided between the

゛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 electromagnetic flow control valve 2. This passage 27 is a check valve for checking the mouth. 53 and a bridge passageway 54 into the bore 52 .

A spool 51 is slidably inserted into the inner hole 52;
When no operation command is given to either the switching electromagnet E or the manual operating device F, the spool 51 is in the state shown in FIG.
It is set to □: so that it can be stopped by.

The spool 51 has a ζ□ land portion 60.6□0・a; 61
°61a; 62 and annular groove 64.64a; 65 °65
a: 66.66m.

In the position shown, the annular groove 64.64a communicates with a discharge passage 68 leading to the tank 7.

The runts 60, 60a each block the ports 55, 56 connected to the actuators.

Land 61.61a is the 1st: Unload passage in the figure: 26
The bridge passageway 54 and the groove 70.70a forming the bridge passage 54 are separated from each other.

Further, the annular grooves 66.6 and '6a are the grooves 70.70a and 70.
1 is connected to form an underload passage 26 which is connected to the unload passage 25i.

・ ・: When the electromagnet E for switching is excited, its iron core 75 moves to the right, and the 3 spools 51 move against the pressing force of the spring 58. When moving to the right, -Groove-70°7
1 near 0a, 71 is land 61.62. 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 actuator via the side road passage 25, the flow rate detection section 20, the supply passage 27, the check valve 53, the bridge passage 54, and the port 56 of the electromagnetic flow control valve 2.

On the other hand, the discharge fluid from the actuator is at port 5'52.
．． It is discharged into the tank 71 via the discharge passage 68.

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

When the spool 51 moves to the left, the bow) 55.56
is the opposite of the above case, and becomes a b-connected state.

That is, port 55 is connected to pump 1, port 56 is connected to tank 7, the discharge fluid of pump 1 is supplied to the actuator through port 55, and the discharge fluid of the actuator is connected to ports 5 and 6□. It is discharged to tank 7 through the tank 7.

'''The manual operating device F is connected to the operating lever L and the operating lever L, and has a tapered portion 8, 0, 8 at the tip thereof.
1, and a pressing body 82 screwed to the right end of the spool 51 and having a diagonal cut 85, 86 corresponding to the tapered portion 80, 81.

□When 6-t is operated in the direction of arrow A in the figure, the rod 74 descends and its tapered portion 81 comes into contact with the slope 86, moving the spool 51 to the left together with the pressing body 82. .

Also, when (L is operated in the direction of arrow B), the ron door 3 is lowered and the spool 51 is moved 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, the fourth
An electrical circuit is provided as schematically shown in FIGS.

In FIG. 4, reference numeral 90 denotes an operation panel, and the operation panel 90 transmits a first command for giving an excitation command to each of the electromagnets of the electromagnetic directional control valve and the electromagnet 3T for unlocking the electromagnetic flow control valve 2. 91, a second command transmitter 92 for giving an excitation command to the electromagnet 35 for controlling the electromagnetic flow control valve 20, and interlocks upon receiving signals from the first and second command transmitters 91 and 92. An interlock circuit 97 is provided.

The first command transmitting unit 91 has push buttons 93e, 93d; 94e, 94d; 95e as first operating members.
95d; 96e, 96d are arranged, and the second command transmitter 92 has a second
An operating lever 98 as an operating member is installed.

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
96e and 96d are electromagnetic directional control valves 4.5, 96d, 96e and 96d, respectively.
6 electromagnet E, [), i.e. 4e.

4d, 5e, sd, 6e, and 6d, and the signal from the first command transmitter 91 by operating these pushbuttons is set to "O" and sent to the interlock circuit 9.
7 is input.

The operation lever 98 gives an excitation signal to the electromagnet 35 of the electromagnetic flow control valve 2 when operated, and changes the excitation force of the electromagnet 35 depending on the amount of operation, and also sends a second command by operating the lever 98. The part 92 signal is “O”.
” is input to the interlock circuit 97.

The output terminal of the interlock circuit 97 is connected to the input terminal of the OR circuit 990, and the AND circuit 1 in the first circuit 210
It is connected to one input terminal of 00.

When the output terminal of the OR circuit 99 is connected to the other input terminal of the AND circuit 100, it is connected to the interlock switch 137 for unlocking the main valve 23a of the electromagnetic flow control valve 2 via the third circuit 230. The switch 137 is connected to the power source 107 via the electromagnet 37 of the electromagnetic flow control valve 2 .

The output end of the AND circuit 100 is connected to an interlock switch 110 for switching the electromagnetic directional control valve, and the switch 110 connects the electromagnets E and D of the control valve, that is, 3e and 3.
d, 4e, 4d, 5e, 5d.

It is connected to the power supply 107 via each of 6e and 6d.

For convenience, in FIG.
Although the D circuit 103djL is not shown, it is an interlock switch 110 for other electromagnets. The connection of AND circuit 100 is also similar to this.

Further, the second command transmitter 92 is connected to a flow rate control interlock switch 135 via a second circuit 220, and the switch 135 is connected to the electromagnet 3 for controlling the electromagnetic flow control valve 20.
5 to the power supply 107.

As shown in FIG. 5, the interlock circuit 97 is composed of a first circuit 97a, a second circuit 97b, a third circuit 97c, and a fourth circuit 97d, each of which is connected to the first circuit 97a shown in FIG. The only difference is the connection relationship between input and output.

The first 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. Circuits NAND1, NAND2; Signal from operating lever 98 and NAND circuit NAND1°NA
AND circuit AND which receives the output signal from ND2
1, AND2; input terminal J, terminal T for receiving the clock pulse signal from the clock pulse generator 108, set terminal S, reset terminal R, output terminal Q
, Q JK flip-flop circuit JK-1,J
K-2; Output signal of NAND circuit NAND1.2 and JK
Output terminal Q of flip-flop circuits JK-1 and JK-2
The output signal of the JK flip-flop circuit JK-1, JK-2 is input to the output signal of the JK flip-flop circuit JK-1, JK-2, and the output signal is input thereto.

The input terminal K and set terminal S of the JK flip-flop circuits JK-1 and JK-2 are grounded, and their input is always rOJ.

A signal from the second command transmitter 92 (operation lever 98) is also input to the other second to fourth circuits, and the push buttons 94e and 94d go to the second circuit 97b, and the push buttons 95e and 95d go to the third circuit 97c. From, push button $6e to the 4th circuit
, 96a are input.

This input circuit 97 is connected to the first command section 91 (
1st operating member) and 2nd command, 9? From (second operation part O)? The signal is inputted as rOJ, which is a signal generated by operating the push button and one operating lever.

When the electromagnetic directional control valve 3 is in the intermediate position, when it receives the transmission signal "0" from the second command transmitter 92 due to the operation of this circuit force: bee cultivation -<-98, the JK flip-flop circuit JK- 1 and JK-2 each output "l" to terminal Q, and terminal -yQ outputs ",O".

For this reason, the salary of 23 main valves (main valve is not released) 1. Replacement valve 3
Yuaya is held in a neutral position.

,,F *Sho, Misaki Button 93. Even if you operate e or 93d, the JK flip-flop circuit JK-1, JK-2
Is it important to keep the previous state? Voice a・Is it 3rd place?・However, when the electromagnetic directional control valve 3 is in the neutral position, the push button ♂, p3e main, j, - is the first command transmitter 91 from the operating section 9.3d, A slightly significant sign, "O", is combined into this circuit: 卆, 1. ．． ! , Nifuritz, Puflo, Tsupuri W! ! Output signal "1." is output only to the middle 4 children and Q of JK-1 or JK-2.

, etc. 1. : First, the holding tongue valve 23a9 is released, and the skewer,
The total flow rate from the force fluid source 1 is transferred to the unload passage 25. It is discharged to the tank 7 through the discharge passage 15, and its virtue is that it is switched to 3.
But, what is the right number? Change position.

After that, the operation lever 98 is operated, and the second
Command transmitter 9? The signal rOJ from
．． ,．． 7 flip-flop times 1iiQK-1°4-
2. Maintain the original state.

Cold? What? , Manipulation Ray <-0 Gaku, Sakutani 1 is better than Misaki Goyo? Electric charge door] 5? The excitation force is adjusted to the actuator?
Salary flow rate is adjusted.

Also, you can end the remote control & $1. JK flip-flop circuit, "0" on terminal Q of S, Taku-1, JK-2
All you have to do is output 1. , reset terminal, R
You can just enter "l" in the field.

Therefore, by pressing the button and operating <-98', input to path 9T ↑41. Just set it to lxJ.

, First, let me explain how this conventional device works.

Is the electromagnetic directional control valve 3.4.5.6 in the neutral position? 1. Operation fq9. ．． 9? Push button (, 1st operation member, 'p
93e.

9, , tei d, 9, 4e...:...? 2. If none of the operating levers (second operating member) 98 are operated. The discharge fluid of the pump 1 3.1 is passed through the electromagnetic flow control valve 2, each of the electric directional control valves 3.4.5.6, and 7. is discharged.

, Also, 1 this 2. The electromagnet 3T of the electromagnetic flow control valve 2 is de-energized and magnetized, so $2.4a is the spring 3.
Is it an old dialect due to ζ that receives the push force of 9? 3a in the locked state and the passage 2. ．． Maintain the maximum flow rate of 5.

・、. In this state 1. , push button 939 when the first operating member is folded down. is manipulated,Q,, the first,
When the signal from the command transmitter 91 is inputted to the 7.1 circuit NANDI of the log circuit 97a, the 5.NAND circuit NAND1 and 1.l are sent to the NAND2
, ``, , Q, , j is an anid circuit AND, .
1. ．． 1 stands for "1", AN,,p,2qmar O,,J
, the OR circuit 9 exclusive 1 outputs rOJ, the OR2 outputs ", 1", and the JK frits 7° phi, the pull circuit JK-1c!
Outputs "1" to terminal Q, r, OJ to terminal Q, JK flip-flop, tsu, 7° decoy path JK-2 outputs "0" to terminal Q, "l" to terminal Q, do.

:The second operating member (operation: ``-'') 9B is operated, and the signal ``O'' is output from the second command transmitter 92.
When input to the activation time 1197a, 1. NAND circuit N public Q
, 1. ．． ．． ．． N, ANp, 2 output each “l”,
AND circuit AND1. AND2 is each,,l! , ``0'' appears.

, this, and □a, the circuit OR1 is r, , , Oj,
OR2: ``,,1.'' Full power, JK flip 7°, T
? Up, circuit sheet □-11. Maintaining the silence of JK-2, 93e is the one operating the press! F, Tagin no J
The output signal of the four-way ab-flop JK-, 1 is input to the OR circuit 99, and the output signal ``1. The signal (11,
is the 3rd I! Route 23, Q via,, hui, nji, 〒,, tsu:lll! S, I, I, 137 has been transmitted, and now this voice, the interpretation of Roak's interpretation, 37 is energized, pushing the iron core 3Q'-&f... 39 to the left. Main valve 2.3
Holding of a is released: book and 8. Also, AND circuit 1 , [
] 3 e, Ii';
The low power signal ``i'' of -1 is input to the input circuit J, and the output signal ``fu'' of the OR circuit 99 is input to 4 and #.

Since it is the afternoon, the AND circuit 103e outputs the signal "l", and the interlock signal 113:! is ONL, 1. The electricity used for cutting, 9 stones 3e, is excited, and its groaning power causes it? When the spool moves, 1 moves to the right.

. Scroll down to 51 and move to the right.
The land portions 61 and 62 respectively block the grooves 70 and 70a forming the unload passage 26, and connect the port 55 connected to the actuator to the discharge passage 68.
and connect 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. bridge passage 2
8. The supply passage 27 is connected to the actuator via the port 56 of the electromagnetic directional valve 3 .

Next, when the second operation member (operation lever) 98 is operated, a signal from this operation is applied to the interlock switch 135 via the second circuit 220, and the electromagnet 35 for controlling the electromagnetic flow control valve 20 is activated by the signal. Generates an excitation force according to the

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 cuts off between the unloading passage 25 and the discharge passage 15, and the fluid pressure in the unloading passage is controlled by the electromagnet. It is raised according to the excitation force of 35.

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 on the operation panel 90 are not operated, 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 and the unload passage 26 is blocked. 55.56
are connected to the discharge passages 68 and the bridge passage 54, respectively.

At this time, the electromagnets 35, 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 core 38, 36. The flow rate control unit 23 does not operate, and causes the discharge fluid of the pump 1 that flows into the unload 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 the pressure fluid source 1 and controls the supply flow rate according to the excitation force of the control electromagnet 35. and the control electromagnet 3 provided in the electromagnetic flow control valve 2.
5 to lock the electromagnetic flow control valve 2 so as to supply the entire amount of pressure fluid from the pressure fluid source 1; a lock release electromagnet 37 for unloading the electromagnetic flow control valve 2; a switching σ electromagnet connected to the electromagnetic flow control valve 2;
On/Off switch that switches the actuator supply/exhaust path by excitation of
an off-type electromagnetic directional switching valve 3.4° 5.6; a manual operating device F provided on the electromagnetic directional switching valve that switches the supply/discharge path and adjusts the flow rate by operating a lever; and a constant signal by operation. a first operation member (push button) that outputs a signal; a second operation member (operation lever 98) that outputs a signal according to the amount of operation; a signal from the first operation member to the switching electromagnet;
a first circuit 210 that transmits the signal from the second operating member to the control electromagnet 35;
20, and a third circuit 230 that is connected in parallel to the first circuit 210 and transmits a signal from the first operating member to the unlocking electromagnet 37, allowing remote control and manual operation. It is something.

However, in this conventional device, when the remote control is stopped, that is, when the electromagnet 35 for controlling the electromagnetic flow control valve 20 and the electromagnet 37 for unlocking are demagnetized, and the electromagnet for switching the electromagnetic directional control valve is demagnetized, There is a problem in that a sudden movement, a so-called shock, occurs before the actuator stops its movement.

The cause of this problem is, firstly, that the signal change from "l" to "0" in the OR circuit 99 in the electrical circuit shown in FIG. 4 is transmitted to the switching electromagnet and the unlocking electromagnet 37. Second, the stroke of the iron core 38 in the unlocking electromagnet 37 is shorter than the stroke of the spool of the magnetic directional control valve.

That is, the unlocking electromagnet 37 and the switching electromagnet are simultaneously demagnetized, and the locking operation of the electromagnetic flow control valve 2 occurs before the electromagnetic directional switching valve returns to its neutral position. When the electromagnetic flow is in the switching position and has not yet returned to the neutral position, the electromagnetic current position split me 26. − to the solenoid directional valve? The above problem occurs because the flow rate increases.

. 'When the coil is turned on, the electromagnetic directional control valve is operated by manual operation device F when the electromagnet for U switching is demagnetized? Since the actuator is used to select the operating direction and control the operating speed (flow rate control), the stroke of the spool cannot be made small due to its structure.

Therefore, the technical problem of the present invention is to delay the demagnetization of the electromagnet for disconnection in the conventional device described above compared to the demagnetization of the electromagnet for switching.

The technical means of the present invention to solve the technical problem is the third
The reason for this is that an off-delay type delay timer is provided during the rotation.

According to this technical means, when stopping remote control, the first
The degaussing signal from the operating member is first transmitted to the electromagnet for switching, and then to the electromagnet for unlocking.
The above technical issues have been resolved.

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

As another technical means to solve the above technical problem, the first
The operating member itself is a lever switch that can be switched in two stages by combining it with a limit switch, and when the lever switch is returned to the original neutral position from the operated state to a certain predetermined angle, the electromagnet for switching is activated. A possible method is to demagnetize the lock release electromagnet when the angle is further returned to below the predetermined angle.

However, according to this other technical means, it is necessary to replace the entire conventional first operating member; 1. .

In addition, if the lever switch in the operated position is quickly returned to the neutral position, that is, if the passage through the predetermined angle is rapid, there will be no difference in the demagnetization timing of the electromagnet for switching and the electromagnet for unlocking. Therefore, the operator's attention is required.

In contrast, 1. In the case of the present invention, an off-delay type delay timer is provided in the third circuit, the first operating member can be used as is, and the first operating member is located in a position that is difficult to operate. To ensure that the switching electromagnet is demagnetized earlier than the unlocking electromagnet, regardless of the speed when returning to the original state 5.

The following is based on Figures 1 to 3, 6, and 7. An example will be explained.

The difference between this real cicada example and the conventional device is 5. In FIG. 6, the third circuit 230 includes an off-delay type Q delay timer 102. .

101 in the figure is an on-delay type delay timer.

Said delay tie, 7101. The operation of delay timer 102 is shown in FIG.

The on-delay type delay timer 101 performs instantaneous recovery in response to the output signal of the OR circuit 99, and the off-delay type delay timer 102 performs instantaneous recovery in response to the output signal of the OR circuit 99. .

In other words, the delay timer 101 starts the 5. This is to delay the switching operation of the electromagnetic direction switching valve O until the end of the unlocking operation of the main valve 23a. Is it possible to delay the locking operation of 23a until the completion of the neutral position return operation of the electromagnetic directional control valve? It is.

That is, regarding the flow of pressure fluid, the circuit shown in FIG. 6 allows 1. Prevent switching of the electromagnetic directional switching valve at a large flow rate, increase the flow rate supplied to the actuator after switching of the switching valve is completed, and then flow to the actuator at the end of remote control? Block maximum flow supply5. After the return of the previous year's switching valve to the neutral position is completed, the maximum flow rate is allowed to flow through the unload passage 26.

Next, the operation of this embodiment will be explained.

The electromagnetic directional control valve 3.4.5.6 is in the neutral position and the first operating member (push button) 93e of the operating panel 90.

93d, 94e...96d, and the second operating member (operating lever) 98 are not operated, the fluid discharged from the pressure fluid source (pump) 1 is controlled by the electromagnetic flow control valve 2,
The unloading passages 25, 26 of each of the Q solenoid directional valves 3, 4, 5, 6 are then delivered to the tank 7.

Also, at this time, an electromagnet 37 for controlling the electromagnetic flow control valve 2
Since the main valve 23a 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.

, In this state, the first operating member, for example, the pushbutton 93
When e is operated and the 9 signal rOJ of the first command transmitter 91 is input to the NAND circuit NANDl of the interlock circuit 97a, the NAND circuit NAND1 outputs "l" and the NAND
2 is rOJ, AND circuit AND1 is “l”, AND
2 is "0", OR circuit OR1 is "0", OR2 is "l"
", the JK flip-flop circuit JK-1 outputs "1" to the terminal Q and "O" to the terminal Q, and the JK flip-flop circuit JK-2 outputs "0" to the terminal Q, and outputs "0" to the terminal Q.
Outputs "l" to .

Next, the operation reno <-98 is operated, and the second command transmitter 92
When the signal "0" is input to the interlock circuit 97a, the NAND circuits NAND1 and NAND2 each become "l".
and the AND circuits AND1 and AND2 each output "0".
" is output.

Therefore, OR circuit OR1 outputs rOJ, OR2 outputs "l", and JK flip-flop circuits JK-1, JK-2
maintains the above state.

The output signal "l" of the JK flip-flop circuit JK-1 when the push button 93e is operated is input to the OR circuit 99, and therefore the OR circuit 99 outputs "l", and the signal "1" is As described above, the signal is transmitted to the interlock switch 137 via the off-delay type (instantaneous action time-limited return type) delay timer 102.

For this reason, the electromagnet 37 for unlocking is excited, and the iron core 3
8 presses the spring 39 to the left, and the main valve 23a is unlocked.

Further, the output signal "l" of the JK flip-flop circuit JK-1 is input to the AND circuit 103e, and the OR
The output signal "l" of the circuit 99 is input after a predetermined time delay (the time required to hold and release the main valve 23a) via an on-delay type delay timer 101.

Therefore, the AND circuit 103e outputs the signal "l" after the main valve 23a is unlocked, the interlock switch 113e is turned ON, the switching electromagnet 3e is excited, and the spool 51 is moves to the right.

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. connection,
Port 56 is connected to bridge passageway 54.

By blocking the unload passage 260, the discharge side of the pump 1 is connected to the flow rate detection section 20 of the electromagnetic flow control valve 2. bridge passage 2
8. The supply passage 27 is connected to the actuator via the port 56 of the electromagnetic directional valve 3 .

These operations are almost instantaneous, and end immediately after the gradual operation of the operation lever 98 starts, and the signal is transmitted to the interlock switch 135 by the subsequent operation of the second operation member (operation lever) 98. The electromagnet 35 for controlling the electromagnetic flow control valve 20 generates an excitation force according to the strength of the signal.

The excitation force of the part-side σ electromagnet 35 presses the poppet valve 24a of the solenoid valve part 24, so that the spring chamber 33 of the flow rate control part 23
The fluid pressure in the main valve 23a increases, and the main valve 23a closes the unload passage 2.
5 and the discharge passage 15, and the fluid pressure in the unload passage is increased according to the excitation force of the electromagnet 35.

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 first operating member (push button) 93e and the second operating member (operating lever) 98 are returned to their original positions, the NAND circuit NANDI is r
OJ is output, the OR circuit OR1 outputs "l", and "l" is input to the reset terminal R, so the JK flip-flop circuit JK-1 outputs rOJ to the terminal Q and "l" to the terminal Q.
1" is output.

The OR circuit 99 which inputs the signal from the terminal Q outputs rOJ, and since the delay timer 101 is an on-delay type (time-limited operation m return type), the interlock switch 103e is instantly turned off and the switching electromagnet is turned off. 3e is demagnetized, and the electromagnetic directional control valve 3 returns to the neutral position.

Further, the change in the output of the OR circuit from "1" to "O" is transmitted to the interlock switch 137 after a predetermined time delay (the time required for the switching valve 3 to return to the neutral position) via an off-delay type delay timer 102. and the switch 137 is turned OFF.
F and the lock release electromagnet 37 is demagnetized.

Therefore, the main valve 23a is locked by the spring 39, and the electromagnetic flow control valve 2 returns to its original state.

When the first operation member (push button) and the second operation member (operation lever) of the operation panel 90 are not operated, when the operation lever L of the manual operation device F is operated in the direction of arrow B in FIG. moving to the right, the unload passage 26 is blocked, and the bows 55 and 56 are respectively discharged from the discharge passage 68.
．． Connected to bridge passage 54.

At this time, since the electromagnets 35.37 of the electromagnetic flow control valve 2 are demagnetized, the spring 39 presses the poppet valve 24a of the electromagnetic valve section 24 via the iron core 38.36, thereby controlling the flow rate. section 23 is not operated and the unload passage 25
The discharge fluid of the pump 1 flowing into the pump 1 is caused to flow into the supply passage 27 in its entirety.

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.

[Brief explanation of the drawing]

Fig. 1 is a pressure fluid control circuit diagram of the conventional device, Fig. 2 is a new view of the electromagnetic flow control valve Q of the conventional device, and Fig. 3 is an analysis view of the electromagnetic directional control valve with manual operation device of the conventional device. Figure 4 is a schematic diagram of the electrical command transmission circuit of the conventional device, and Figure 5 is a schematic diagram of the electrical command transmission circuit of the conventional device.
6 is a schematic diagram of an electrical command transmission circuit in one embodiment of the device of the present invention, and FIG. 7 is an explanatory diagram of the operation of the delay timer in FIG. 6. 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 (3d, 4d, 5d, 6d) and E (3e, 4e
, 5e, 6e)=...-electromagnet for switching, 93e,
93d, 94e, 94d, 95e. 95d, 96e, 96d...First operating member (push button), 98...Second operating member (operating lever), 102...Off-delay type delay timer,
210...first circuit, 220...second circuit
Circuit, 230...Third circuit, w, x, y, z・
...actuator.

Claims (1)

[Claims for Utility Model Registration] An electromagnetic flow control valve connected to a pressure fluid source and controlling the supply flow rate according to the excitation force of a control electromagnet, and an electromagnet provided in the electromagnetic flow control valve for controlling the flow rate. a spring that engages the pressure gas to lock the electromagnetic flow control valve to supply the full amount of pressure fluid from the fluid source;
1. A release electromagnet that unloads the electromagnetic flow control valve by disengaging the spring from the control electromagnet, and a switching electromagnet connected to the electromagnetic flow control valve that is energized An on/off type electromagnetic directional switching valve that switches the supply/discharge path of the Akuji 5/2 valve, an L lever provided on the electromagnetic direction/switching valve, and a manual operation that switches the supply/discharge path and adjusts the flow rate by operating the L lever. A first operating member that outputs a constant signal when operated, a second operating member that outputs a signal corresponding to the manipulated variable, and a signal from the first operating member that outputs a a first circuit for transmitting information to a switching electromagnet;
-: a second circuit that transmits a signal from the second operating member to the control electromagnet; a third circuit connected in parallel to the first circuit and transmitting a signal from the first operating member to the unsecuring electromagnet;
- A pressure fluid control device comprising: □ □ □1, wherein an off-delay type delay timer is provided in the third circuit.