JP2642302B2 - Air cylinder start control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cylinder start control method using an air cylinder drive control circuit.

[0002]

2. Description of the Related Art Conventionally, various air cylinder drive control circuits for supplying high-pressure air to an air cylinder and controlling the moving speed of a piston have been proposed. FIG. 6 shows a drive control circuit in which the piston 92 of the air cylinder 91 is reciprocated. This circuit includes two chambers defined by a piston 92 in an air cylinder 91, that is, a head side cylinder chamber 91.
a, the rod-side cylinder chamber 91b and the direction switching valve 93 are connected by supply / discharge passages 94a and 94b, respectively. The other end of the direction switching valve 93 is connected to an air supply source P and a muffler S.

Each of the supply / discharge passages 94a, 94b is provided with a throttle valve 95a, 95b, respectively, and check valves 96a, 96b are connected in parallel to the respective throttle valves 95a, 95b. Each check valve 96a, 96b is connected by a direction switching valve 93 so that when the supply / discharge passages 94a, 94b are on the air supply side, they are forward.

When the directional control valve 93 is switched to move the piston 92 forward (extend the piston rod 92a) as shown in FIG. 6, high-pressure air from the air supply source P is supplied to the directional control valve 93 and the directional control valve 93. Check valve 9 in supply / discharge passage 94a
It is supplied to the head side cylinder chamber 91a via 6a.
On the other hand, the air in the rod-side cylinder chamber 91b is supplied to the supply / discharge passage 9
The exhaust gas is discharged through the throttle valve 95b and the direction switching valve 93 of FIG. That is, as shown in FIG. 9, the normal speed during forward movement is determined by the throttle amount of the check valve 96b. Although the internal pressure Pb of the rod-side cylinder chamber 91b is higher than the internal pressure Pa of the head-side cylinder chamber 91a, the rod-side cylinder chamber 91b has a piston rod 92a therein. Since the pressure receiving area of the piston 92 is small, the piston 92 moves forward. The same applies hereinafter.

However, at the same time when the direction switching valve 93 is switched, it is supplied directly to the head side cylinder chamber 91a via a forward check valve 96a. Therefore, the time when the internal pressure Pa of the head side cylinder chamber 91a reaches an internal pressure sufficient to move the piston 92 is extremely short (0.0%).
7 seconds). As a result, as shown in FIG. 9, the speed at which the movement of the piston 92 starts to move is increased for a moment, and gradually moves to a steady speed due to the rapid increase in the internal pressure Pa. That is, there is a problem that the piston 92 jumps out at the start of the movement.

In order to prevent the sudden jump of the piston 92, a pneumatic circuit shown in FIG. 7 can be considered. This pneumatic circuit corresponds to the supply / discharge passage 94 in the pneumatic circuit shown in FIG.
The check valve 96a is connected in the opposite direction. That is, the check valve 96a on the supply / discharge passage 94a side is
When the supply / discharge passage 94a is on the air supply side, it is connected in the opposite direction.

The high-pressure air from the air supply source P is supplied to the head-side cylinder chamber 91a via the throttle valve 95a of the supply / discharge passage 94a. Therefore, the internal pressure Pa of the head side cylinder chamber 91a is determined by the throttle amount of the throttle valve 95a, and gradually rises as shown in FIG.
As a result, the piston 92 starts to move at a steady low speed, and no operation such as the popping out of the piston 92 occurs.

In the pneumatic circuit shown in FIG.
The air tank 97 is connected to the supply / discharge passage 94a as shown in FIG. 4 to temporarily store the air rapidly supplied to the head side cylinder chamber 91a and supply the air to the cylinder chamber 91a, thereby preventing the piston 92 from jumping out. You can also.

[0009]

However, in the pneumatic circuit shown in FIG. 7, since the internal pressure Pa of the head side cylinder chamber 91a is determined by the throttle amount of the throttle valve 95a,
As shown in FIG. 10, the time (in this case, 1.6 seconds) required to reach the internal pressure Pa necessary for starting the movement becomes very long, resulting in poor responsiveness. A similar problem also occurs when the air tank 97 shown in FIG. 8 is provided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an air cylinder start control method capable of quickly starting the movement of a piston without causing a pop-out operation and having excellent responsiveness. The purpose is to do.

[0011]

Means for Solving the Problems] To solve the above SL problems, a first aspect of the present invention, the second chamber and the direction change valve partitioned connected by respective supply and exhaust passage by the piston in the air cylinder , a throttle valve provided in each supply and discharge passages, one
In one supply / discharge passage connected to the other chamber, a check valve is connected in parallel to the throttle valve so as to be in the forward direction when the air supply side is reached by switching the direction switching valve, and the other.
In the other supply / discharge passage connected to the other chamber, a check valve that reverses the direction when the air supply side is reached by switching the directional control valve is supplied with air rapidly until the set pressure is reached.
Air cylinder drive control circuit in which pressure reducing valves for stopping air supply when the pressure reaches
And the piston when air is supplied to the other chamber.
Air cylinder start control for controlling the start to the one chamber side
The initial state of air supply to the other chamber.
After the air is rapidly supplied through the pressure reducing valve
So that the pressure reducing valve stops the air supply.
The set pressure is adjusted in advance, and rapid air supply from the pressure reducing valve is performed.
After the supply is stopped, the above-mentioned connected to the other supply / discharge passage
Air is gradually supplied to the other chamber via a throttle valve to
The gist is to start moving the ton to the one chamber side .

[0012]

[0013]

[Operation] Therefore, the initial state of the air supply to the other chamber is reduced.
After the air is rapidly supplied through the pressure reducing valve,
Air supply from the pressure valve stops. After that, the other
Gradually into the other chamber via a throttle valve connected to the passage
Air is supplied and the piston starts moving to one chamber
You. As a result, the piston starts moving toward one chamber
When moving the piston, prevent it from popping out
The time to start can be shortened.

[0014]

[0015]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a drive control circuit which reciprocates a piston 2 of an air cylinder 1 at a low speed. Inside the air cylinder 1, a piston 2 is housed so as to be slidable in the longitudinal direction (left-right direction in FIG. 1) while being in close contact with the inner peripheral wall of the air cylinder 1. The piston 2 has a piston rod 3 in FIG. It protrudes to the right of. On the left and right sides of the piston 2, the head-side cylinder chamber 1 a and the rod-side cylinder chamber 1
b is sectioned. A first supply / discharge passage 4a is provided in the head cylinder chamber 1a, and a second supply / discharge passage 4a is provided in the rod cylinder chamber 1b.
The supply / discharge passages 4b are respectively connected. The two supply / discharge passages 4a and 4b are connected to a direction switching valve 5. The other end of the direction switching valve 5 is connected to an air supply source P and a muffler S.

The directional control valve 5 is a two-position, five-port electromagnetic directional control valve. When the electromagnetic solenoid 6 is in a demagnetized state, the directional control valve 5 is switched to the home position b by the urging force of the spring 7 and held. Has become. When the electromagnetic solenoid 6 is excited, the position is switched to the position a.

At the position a, the direction switching valve 5 connects the first supply / discharge passage 4a to the air supply source P and connects the second supply / discharge passage 4b to the muffler S. Further, at the position b, the first supply / discharge passage 4a and the muffler S are communicated, and the second supply / discharge passage 4b is communicated with the air supply source P.

A throttle valve 8 is provided in the second supply / discharge passage 4b, and a check valve 9 is connected to the throttle valve 8 in parallel. The check valve 9 is connected by the direction switching valve 5 so as to be forward when the second supply / discharge passage 4b is on the air supply side.

A flow control valve 1 is provided in the first supply / discharge passage 4a.
0 is provided. The flow control valve 10 is configured by connecting a pressure reducing valve 11, a throttle valve 12, and a check valve 13 in parallel with each other. The check valve 13 is connected by the direction switching valve 5 so as to be in the opposite direction when the first supply / discharge passage 4a is on the air supply side.

Next, a specific configuration of the flow control valve 10 will be described with reference to FIG. The flow control valve main body 10a is provided with a first port 14 to be connected to the direction switching valve 5 side. The first port 14 communicates with the first port 14 and the lower surface of the flow control valve main body 10a is closed by a lid body 15. A first main line 16 is formed. A second port 17 to be connected to the air cylinder 1 side is provided on a side of the flow control valve body 10a opposite to the first port 14, and a second main line 18 communicating with the second port 17 is a first main line. It is formed in parallel with the path 16.

The partition wall 19 for partitioning the first main line 16 and the second main line 18 has the first port 1 from the second port 17 side.
The first passage 20 and the second passage 2 in this order toward the fourth side.
1, a third passage 22 is provided. The third passage 22
It is formed at the center of the valve seat 23 fitted to the partition wall 19. The valve seat 23 is formed with a protrusion 23a that protrudes slightly toward the first main conduit 16 and a protrusion 23b that protrudes largely toward the second main conduit 18.

A throttle valve 12 is provided above the flow control valve body 10a at a position corresponding to the first passage 20. The seat 24 of the throttle valve 12 is fitted to the flow control valve main body 10a, and a valve shaft 25 having a male thread on a side face is screwed into the seat 24. The adjusting groove 2 is provided at the base end 26 of the valve shaft 25.
The valve shaft 25 is kept airtight by an O-ring 28 and extends to the first passage 20. And the tip part 29 of the valve shaft 25 is formed in a tapered shape,
A part thereof is interposed in the first passage 20.

Therefore, when the tip of the driver is engaged with the adjusting groove 27 and turned, the height position of the tip 29 of the valve shaft 25 changes. That is, the opening area of the first passage 20 changes based on the amount of rotation of the driver, so that the flow rate of air flowing through the first passage 20 can be adjusted. Further, the air flowing into the head side cylinder chamber 1a is regulated by the throttle valve 12, so that the piston rod 3 does not jump out when the movement of the piston 2 is started.

A check valve 13 is provided at a position corresponding to the second passage 21 on the lid 15 provided on the lower surface of the flow control valve body 10a. The guide portion 31 of the check valve 13 is provided on the lid 15, and a valve shaft 33 having an open / close valve 32 at one end is slidably inserted along the guide portion 31 in the guide portion 31. A spring 34 is interposed between the on-off valve 32 and the lid 15, and the on-off valve 32 always closes the open end of the second passage 21 by the urging force of the spring 34.

Accordingly, in the second passage 21, air flows into the second main conduit 18, and when air pressure opposing the elastic force of the spring 34 is applied to the on-off valve 32, the on-off valve 32 is pushed down. The first main line 16 and the second main line 18 are communicated with each other, so that air flows from the second main line 18 to the first main line 16. Further, when the second passage 21 is closed by the on-off valve 32, air is not circulated from the first main line 16 to the second main line 18.

The pressure reducing valve 11 includes a pressure reducing valve main body 11a provided at a position corresponding to the third passage 22 above the flow control valve main body 10a, and a valve shaft 11b inserted through the third passage 22.
Consists of The seat 35 of the pressure reducing valve main body 11a is fitted to the flow control valve main body 10a and formed so as to protrude outside the flow control valve main body 10a. A cavity 36 is provided inside the seat 35, and an elastic diaphragm 37 is provided.
Then, the lower surface of the seat body 35 is closed. A pressing valve 38 is disposed inside the cavity 36 in a state of contacting the diaphragm 37,
The press valve 38 is provided with a spring receiver 40 via a spring 39.

From the upper part of the seat 35, an adjusting shaft 41 having an external thread is screwed into a side surface thereof, and is brought into contact with the spring receiver 40. An adjusting groove 42 is provided on the head of the adjusting shaft 41, and a pressing force of the pressing valve 38 against the diaphragm 37 is adjusted by engaging a driver or the like in the adjusting groove 42 and rotating. ing.

On the other hand, the base end of the valve shaft 11b is
Is slidably inserted in the guide portion 15a provided in the first portion. Then, the valve shaft 11b is inserted into the third passage 22,
The distal end portion is in contact with the pressing valve 38 via the diaphragm 37 of the pressure reducing valve main body 11a. Further, a valve element 11c is formed in a portion of the valve shaft 11b interposed in the first main conduit 16, and the valve element 11c is engaged with the projection 23a of the valve seat 23 so as to close the third passage 22. Has become. A spring 11d is interposed between the valve body 11c and the lid 15, and the valve shaft 11b is elastically supported by the elastic force of the spring 11d.

Therefore, when air flows into the first main conduit 16, at the initial stage, the air flows through the third passage 22 to the second main passage 16.
It flows out to the main line 18. Air pressure Pd in second main line 18
Becomes high enough to oppose the pressing force of the pressing valve 38, and the air pressure Pd is raised by the pressing valve 38 and the valve body 1
1c is also pushed up. The third passage 22 is closed by the engagement of the valve element 11c with the protrusion 23a.

Next, the operation of the air cylinder drive control circuit and the flow control valve configured as described above will be described. First, in an initial state, the electromagnetic solenoid 6 of the direction switching valve 5 is excited, and the direction switching valve 5 is held at the position a. At this time, the piston rod 3 is in an extended state.

In order to contract the piston rod 3, first, the electromagnetic solenoid 6 is demagnetized. Then, the direction switching valve 5 is switched to the position b by the urging force of the spring 7, and
The air supply source P communicates with the second supply / discharge passage 4b, and the muffler S communicates with the first supply / discharge passage 4a. The air supplied from the air supply source P is supplied into the rod-side cylinder chamber 1b through a check valve 9 connected in parallel to the second supply / discharge passage 4b. When air is supplied into the rod-side cylinder chamber 1b, the pressure Pb in the rod-side cylinder chamber 1b increases, and the pressure Pb causes the piston 2 to move in the direction in which the piston rod 3 contracts. On the other hand, the air in the head side cylinder chamber 1a is discharged to the silencer S through a check valve 13 provided in parallel with the first supply / discharge passage 4a.

Next, to extend the piston rod 3, the electromagnetic solenoid 6 is excited. Then, the direction switching valve 5 is switched to the position a, the air supply source P and the first supply / discharge passage 4a are communicated, and the second supply / discharge passage 4b and the silencer S are connected.
Is communicated. At this time, in the flow control valve 10 shown in FIG. 2 provided in the first supply / discharge passage 4a, since air flows from the first main line 16 to the second main line 18 through the throttle valve 12, the head side cylinder The air supplied to the chamber 1a is regulated.

However, in the initial state of the air supply, since the valve body 11c of the pressure reducing valve 11 is open, the air is supplied to the head side cylinder chamber 1a through the third passage 22.
As the air continues to be supplied, the pressure Pd in the second main line 18 increases. When the pressure Pd becomes larger than the pressing force of the spring 39 provided on the pressure reducing valve main body 11a, the valve body 11c
Is pushed up and engaged with the projection 23a to close the third passage 22.

Therefore, even if the air supplied to the head side cylinder chamber 1a is regulated by the throttle valve 12, the air is kept at the third pressure up to the set pressure of the pressure reducing valve in the initial state of air supply.
It is supplied to the head side cylinder chamber 1a through the passage 22. That is, a pressure Pa sufficient to start the movement of the piston 2 is quickly generated.

On the other hand, the air in the rod side cylinder chamber 1b is discharged to the silencer S through the second supply / discharge passage 4b.
Since the throttle valve 8 is provided in the supply / discharge passage 4b, the air is slowly discharged to the muffler S based on the throttle amount of the throttle valve 9. That is, since the discharge of air is regulated by the throttle valve 8, the extension of the piston rod 3 is performed at a low speed.

FIG. 3 shows the pressures Pa and Pb, the displacement of the piston 2 and the speed of the piston 2 with respect to the time t when the piston rod 3 is extended. Direction switching valve 5 at time T1
Is switched to the a position, the pressure P
Since a does not rise rapidly, there is no sudden jump of the piston 2. However, a pressure Pa sufficient to start the movement of the piston 2 by the pressure reducing valve 11 is quickly generated. In addition,
In this case, the time required for the piston 2 to start moving from the time when the direction switching valve 5 is switched is 0.5 second.
Further, the reason why the piston 2 moves toward the piston rod 3 in spite of the fact that the pressure Pa is smaller than the pressure Pb in FIG. 3 is due to the difference between the pressure receiving areas of the pressures Pa and Pb.

As described above, in this embodiment, the flow control valve 10
By providing the throttle valve 12 inside, the piston rod 3 can be prevented from jumping out when the piston rod is extended. Furthermore, since the pressure reducing valve 11 is provided in parallel with the throttle valve 12, the time from when the directional control valve 5 is switched to when the piston rod 3 starts to extend, despite preventing the piston rod 3 from jumping out. Can be shortened.

When working with the air cylinder 1,
There is a possibility that a deviation from a target extension start timing may occur due to a change in load applied to the piston rod 3. In the present embodiment, the adjustment valve 41 provided on the pressure reducing valve 11 is
Since the pressing force of No. 8 can be adjusted, even if it deviates from the target contraction start timing, it can be easily corrected.

In addition, when the pressure reducing valve 11 does not operate, for example, when the pressure reducing valve 11 has been used for many years, there is a possibility that a malfunction occurs. Also in this case, since the pressure reducing valve 11 is provided in parallel with the throttle valve 12 and the check valve 13, the function as a flow control valve can be achieved only by the throttle valve 12 and the check valve 13.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. The same parts as in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 4 shows a drive control circuit which reciprocates the piston 2 of the air cylinder 1 at a low speed. In the first supply / discharge passage 4a, a second flow control valve 43 is provided in series with the first flow control valve 10. The second flow control valve 43 is configured by connecting a relief valve 44, a throttle valve 45, and a check valve 46 in parallel. The check valve 46 is connected by the direction switching valve 5 so as to be forward when the first supply / discharge passage 4a is on the air supply side.

Next, a specific configuration of the second flow control valve 43 is shown in FIG. The flow control valve body 43a is provided with a first port 47 to be connected to the direction switching valve 5 side. The first port 47 communicates with the first port 47 and the flow control valve body 43a.
Of the first type pipeline 4 by closing the lower surface of the
9 are formed. The first of the flow control valve body 43a
A second port 50 to be connected to the first flow control valve 10 is provided on a side opposite to the port 47. The second main line 51 communicating with the second port 50 is formed in parallel with the first main line 49 via a partition wall 52.

The partition 52 for partitioning the first main line 49 and the second main line 51 has a first port 4 from the second port 50 side.
The first passage 53 and the second passage 5 in this order toward the side 7.
4, a third passage 55 is provided. A valve seat 56 is fitted into the partition 52 in the third passage 55.

A throttle valve 45 is provided at a position corresponding to the first passage 53 above the flow control valve body 43a. The seat body 57 of the throttle valve 45 is fitted to the flow control valve main body 43a, and the seat body 57 is screwed with a valve shaft 58 having a male thread on a side surface. The adjusting groove 6 is provided in the base end portion 59 of the valve shaft 58.
0 is provided, the valve shaft 58 is kept airtight with an O-ring 61, and extends to the first passage 53. And the tip part 62 of the valve shaft 56 is formed in a tapered shape,
A part thereof is interposed in the first passage 53.

Therefore, when the tip of the driver or the like is engaged with the adjusting groove 60 and turned, the height position of the tip 62 of the valve shaft 58 changes. That is, the opening area of the first passage 53 changes based on the amount of rotation of the driver, so that the flow rate of air flowing through the first passage 53 can be adjusted.

A check valve 46 is provided above the flow control valve body 43a at a position corresponding to the second passage 54. The seat 63 of the check valve 46 is fitted into the flow control valve main body 43a, and a guide shaft 64 having an opening / closing valve 65 at one end is fitted to a guide 64 recessed at the center of the seat 63.
Are slidably inserted along. And the on-off valve 6
A spring 67 is interposed between 5 and the seat 63, and the on-off valve 65 always closes the open end of the second passage 54 by the urging force of the spring 67.

Accordingly, in the second passage 54, when air flows into the first main conduit 49 and an air pressure opposing the elastic force of the spring 67 is applied to the on-off valve 65, the on-off valve 65 is pushed up. The first main line 49 and the second main line 51 are communicated with each other, and air is circulated from the first main line 49 to the second main line 51. Further, when the second passage 54 is closed by the on-off valve 65, air is not circulated from the second passage 54 to the second main pipe 49.

A relief valve 44 is provided above the flow control valve body 43a at a position corresponding to the third passage 55. The seat 68 of the relief valve 44 is
and is formed to protrude outside the flow control valve body 43a. A space 69 is provided inside the seat body 68, and the lower surface of the seat body 68 is closed by an elastic diaphragm 70. Inside the space 69 is a diaphragm 70
The pressing valve 71 is disposed in a state where the pressing valve 71 is in contact with the pressing valve 71, and the pressing valve 71 is provided with a spring receiver 73 via a spring 72.

An adjusting shaft 74 having an external thread is screwed into the side from the upper portion of the seat body 68 and is in contact with the spring receiver 73. An adjusting groove 75 is provided in the head of the adjusting shaft 74, and a pressing force of the pressing valve 71 against the diaphragm 70 is adjusted by engaging a driver or the like in the adjusting groove 75 and rotating. ing. The pressing valve 71 is in contact with the valve seat 56 inserted into the partition wall 52 via the diaphragm 70.

Therefore, the air in the second main channel 51 is pushed up when the air pressure opposing the pressing force of the pressing valve 71 is applied to the diaphragm 70,
The press valve 71 is pushed up, and the first main line 49 and the second main line 51 are communicated. Then, when the air flows out to the first main line 49 through the third passage 55, the air pressure in the second main line 51 decreases, and the pressing force of the pressing valve 71 causes the third passage 55.
Is to be closed again.

Next, the operation of the air cylinder drive control circuit and the flow control valve configured as described above will be described. First, to contract the piston rod 3, the electromagnetic solenoid 6 is demagnetized. Then, the direction switching valve 5 is connected to the spring 7
Is switched to the position b by the urging force, and the air supply source P communicates with the second supply / discharge passage 4b, and the muffler S communicates with the first supply / discharge passage 4a. The air supplied from the air supply source P is supplied into the rod-side cylinder chamber 1b through a check valve 9 connected in parallel to the second supply / discharge passage 4b. At this time, the air in the head side cylinder chamber 1a is discharged to the muffler S through the first supply / discharge passage 4a, but the discharge of air is regulated by the throttle valve 45 provided in the first supply / discharge passage 4a. Therefore, the air in the second main conduit 51 shown in FIG. 5 is gradually discharged.

However, the pressure Pd pushes up the diaphragm 70 which is in contact with the valve seat 56, so that the first main line 49 and the second main line 51 communicate with each other through the third passage 55. Then, the air that has stayed in the second main pipe 51 is removed from the third passage 5.
5, the pressure Pd is rapidly reduced, and the pressure difference between the pressure Pa and the pressure Pb required to start the movement of the piston 2 is also quickly generated.

When the pressure Pd becomes smaller than the pressing force of the spring 72, the diaphragm 70 comes into contact with the valve seat 56 again to close the third passage 55. When the third passage 55 is closed, the air is discharged while being restricted by the throttle valve 45, so that the piston 2 slowly moves in the contracting direction of the piston rod 3.

Therefore, in this embodiment, the first flow control valve 10 can prevent the piston rod 3 from jumping out when the piston rod is extended. Further, the time from when the directional control valve 5 is switched to when the piston rod 3 starts to elongate can be reduced in spite of preventing the piston rod 3 from jumping out.

Further, the throttle valve 4 is provided in the second flow control valve 43.
5, a relief valve 44 is provided in parallel with the check valve 46. Therefore, it is possible to eliminate the delay in the decrease in the pressure Pa at the start of the contraction of the piston rod 3 despite the fact that the piston 2 moves at a low speed.

When working with the air cylinder 1,
There is a possibility that a deviation from a target extension start timing may occur due to a change in load applied to the piston rod 3. In the present embodiment, since the pressing force of the pressing valve 71 can be adjusted by the adjusting shaft 74 provided on the relief valve 44, even if it deviates from the target contraction start timing, it can be easily corrected.

Also, a state in which the relief valve 44 does not operate,
For example, it may break down if used for many years. Even in this case, the relief valve 44 is a throttle valve 45 and a check valve 46.
And the throttle valve 45 and the check valve 46 alone can function as a flow control valve.

It should be noted that the present invention is not limited to the above-described embodiment, and can be embodied with the following modifications without departing from the spirit of the invention. (1) The positions of the first flow control valve 10 and the second flow control valve 43 may be reversed.

(2) The arrangement of the pressure reducing valve 11, the throttle valve 12, and the check valve 13 provided in the first flow control valve 10 is not limited to the above embodiment as long as the arrangement is parallel. For example, the positions of the pressure reducing valve 11 and the throttle valve 12 may be reversed, or the positions of the throttle valve 12 and the check valve 13 may be reversed. Of course, another arrangement order may be used. Further, the same applies to the second flow control valve 43.

(3) The valve seat 23 provided in the first flow control valve 10 and the seat pair 24 of the throttle valve 12 are connected to the flow control valve main body 1.
0a may be integrally formed. In addition, the second flow control valve 4
The valve seat 56, the seat body 63 of the throttle valve 45, and the seat body 68 of the check valve 46 provided in the inside 3 may be formed integrally with the flow control valve body 43a.

(4) In this embodiment, two mufflers S are provided, and the directional control valve 5 is of a 2-position 5-port type. It may be a type.

[0062]

As described in detail above, according to the present invention, there is an excellent effect that the piston can be started to move quickly without causing the pop-out operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a drive control circuit of an air cylinder according to a first embodiment.

FIG. 2 is a sectional view showing a flow control valve.

FIG. 4 is an explanatory diagram showing each pressure and the amount of displacement of the piston with respect to the time when the piston rod contracts.

FIG. 4 is a block diagram showing a drive control circuit for an air cylinder according to a second embodiment.

FIG. 5 is a cross-sectional view showing a second flow control valve.

FIG. 6 is a block diagram showing a conventional air cylinder drive control circuit.

FIG. 7 is a block diagram showing a conventional air cylinder drive control circuit.

FIG. 8 is a block diagram showing a conventional air cylinder drive control circuit.

FIG. 9 is an explanatory diagram showing each pressure, displacement amount and speed of a piston with respect to time when a piston rod is extended in a conventional air cylinder drive control circuit.

FIG. 10 is an explanatory diagram showing each pressure, displacement amount and speed of a piston with respect to time when a piston rod is extended in a conventional air cylinder drive control circuit.

[Explanation of symbols]

1 ... air cylinder, 1 a ... head side cylinder chamber, 1 b ...
Rod side cylinder chamber, 2 ... piston, 4a ... first supply / discharge passage, 4b ... second supply / discharge passage, 5 ... directional switching valve, 8 ... throttle valve, 9 ... check valve, 10 ... flow control valve, 10a ... Flow control valve main body, 11 ... pressure reducing valve, 11a ... pressure reducing valve main body, 11c ...
Valve element, 12: throttle valve, 13: check valve, 14: first port, 16: first main line, 17: second port, 18: second
Main conduit, 19 ... partition wall, 20 ... first passage, 21 ... second passage, 22 ... third passage, 23 ... valve seat, 37 ... diaphragm, 39 ... spring, 41 ... adjustment shaft.

Claims (1)

(57) [Claims] 1. A piston (2) in an air cylinder (1).
The two chambers (1a, 1b) divided by the directional control valve (5) are connected by supply / discharge passages (4a, 4b), respectively.
A throttle valve (8, 1) is provided in each supply / discharge passage (4a, 4b).
2) is provided, and one of the supply / discharge passages (4b) connected to the one chamber (1b) is non-returned so as to be in the forward direction when it is on the air supply side by switching the direction switching valve (5). connected in parallel to the throttle valve of the valve (9) (8), the other
The other supply / discharge passage (4a) connected to the chamber (1a) has a check valve (13) which is in the opposite direction when it is on the air supply side by switching the direction switching valve (5) and has a set pressure. Us
Until the pressure reaches the set pressure.
The pressure reducing valves (11) to be stopped are each replaced with the throttle valve (12)
Use the d Ashirinda drive control circuit connected in parallel with
, When the air is supplied to the other chamber (1a)
Control of the start of the housing (2) toward the one chamber (1b).
An air cylinder start control method, wherein in an initial state of air supply to the other chamber (1a),
After rapidly supplying air through the pressure reducing valve (11)
So that the pressure reducing valve (11) stops the air supply.
The set pressure of the pressure reducing valve (11) is adjusted beforehand,
After the rapid air supply from (11) stops, the other
The throttle valve (12) connected to the supply / discharge passage (4a) of
The air is gradually supplied to the other chamber (1a) through the
Ton (2) is started to move toward the one chamber (1b).
Air cylinder start control method.