JPS6144004Y2 - - Google Patents

Description

[Detailed description of the invention] Normally, when lifting or lowering heavy objects using an actuator used in a pneumatic circuit, two speed controllers A and B are used as shown in Figure 4. , the speed controller A on the cylinder C side is connected with controlled flow (meter-in), and the speed controller B on the switching valve D side is connected with free flow (meter-out). Therefore, in this case, when lifting the heavy object W, the flow rate of compressed air into the cylinder C is controlled by the speed controller A (meter-in) on the cylinder side, and when lowering it, the flow rate is controlled by the speed controller B on the switching valve side. (meter-out) controls the displacement.

In addition, as a conventional speed controller configured by combining the functions of the two speed controllers mentioned above, FIGS.
There is a picture.

To explain what is shown in FIGS. 8, 9, and 10, compressed air from the inlet passage 1 of the control valve is throttled by the aperture a between the small hole 8 of the poppet and the needle 5, and passes through the outlet passage 2. Controlled by meter-in to the cylinder side. Conversely, the compressed air from the cylinder causes the poppet 9 to stop at the stopper 1 as shown in FIG. 9 due to the pressure difference between the outlet passage 2 and the inlet passage 1.
It moves to the right until it hits point 1, is constricted by a restriction b between the small hole 14 of the bushing 3 and the small diameter portion at the tip of the poppet, and is metered out to the inlet passage 1.

In the above conventional ones, normal meter-in,
Since it only has the function of meter-out control, when a heavy object descends, meter-out control is performed by speed controller B.
There is a drawback that the stopping time from switching the directional control valve D to the initial movement of the piston when it descends is long.

This invention allows the speed controller that performs meter-out control to have a rapid exhaust function, thereby greatly shortening the stopping time leading to the initial movement of the piston when it descends, thereby increasing work efficiency.

The basic structure of this device is that a flow control valve with a quick exhaust valve, which has a rapid exhaust function and a flow rate control function, is installed in the head side pipe between the cylinder and the directional control valve, and the pressure inside the cylinder is When the pressure is higher than the pressure set by the quick exhaust valve section, the quick exhaust valve opens and rapidly exhausts the pressure inside the cylinder, shortening the stop time at startup, and the speed when lowering the heavy object is reduced after the quick exhaust valve is closed. Meter-out control is performed by the flow control valve section,
The speed when a heavy object is raised is controlled meter-in by a speed controller arranged in series on the cylinder side, with the rapid exhaust valve section of the flow control valve equipped with a rapid exhaust valve open.

Next, this invention will be explained with reference to the drawings.

1 and 2, a body 1 is provided with ports 2 and 3, and a rapid exhaust valve 5 is disposed in a passage 4 connecting these ports 2 and 3, and is arranged in parallel with the passage 4. A flow control valve 7 is provided in the passage 6 that is formed.

First, to explain the rapid exhaust valve 5, the port 2 is connected to the valve seat 8 formed in the body 1.
A cylindrical cylindrical wall 11 that integrally constitutes the valve body 9 and the piston-shaped cutting wall 10 from the side and allows the piston-shaped cutting wall 10 to slide airtightly is formed on the main body 1 . a pressure regulating body 13 screwed into an internally threaded cylindrical wall 12 extending from the cylindrical wall 11;
A pressure regulating spring 14 is compressed between the piston-shaped cutting wall 10 and the piston-shaped cutting wall 10 .

With the pressure on the port 2 side as the pilot pressure,
A load is applied to the piston-shaped farm wall 10, and the pressure regulating spring 14
The force of the pressure regulating spring 14 is applied to the groove 15 carved in the end face of the pressure regulating member 13 by the driver. This is done by fitting and rotating the tips.

On the other hand, a flow control valve 7 provided in a passage 6 formed in parallel to the passage 4 has the following structure. That is, the valve seat 16 formed in the passage 6
It consists of a valve body 17 that sits on this valve seat 16, and a stem 19 that is loosely inserted into an insertion hole 18 formed in this valve body 17, and this stem 19 is extended and has a screw thread 20 at its end. A threaded cylinder 22 having an internal thread 21 that engages with this thread 20 is screwed into an internal thread 23 provided in the body 1, and is rotated on the end face of the stem 19 screwed into this threaded cylinder 22. A groove 24 for movement operation is formed, and by fitting the tip of a driver into this groove 24 and rotating it, the stem 19 is advanced and the valve body 17 is pushed and moved, and the valve body 17 is moved against the valve seat 16. It adjusts the degree of opening. FIG. 3 shows a fluid circuit configured using the flow control valve with quick exhaust valve (FIG. 1) 30 and the speed controller 30' having the above configuration, and the primary side of the flow control valve with quick exhaust valve 30 is shown in FIG. A compressed air source 32 is communicated with the port 2 via the directional switching valve 31, and the secondary port 3 is arranged in the pressurizing chamber 34 of the cylinder 33 of the actuator, that is, the chamber 34 on the head side via the communication port 35. controller 3
Connect the heavy object 36 to the primary side of 0' and connect it to the rod 37.
The heavy object 36 is lifted by applying compressed air pressure to a piston 38 supported through the rod, and the chamber 39 on the rod side communicates with the atmosphere through a communication port 40.

First, when the piston 38 is raised, the compressed air supplied via the directional control valve 31 enters the inlet 2.
When the air is supplied into the body 1, as long as the air pressure is equal to or higher than the pressure set by the pressure regulating spring 14, the air passes freely between the open valve body 9 and the valve seat 8. It flows to the outlet 3 as a flow, and is introduced into the pressurizing chamber 34 as a controlled flow (meter-in control) by the speed controller 30' through its adjusted throttle, causing the piston 38 to rise at a constant speed. This relationship is illustrated in FIG. 6, where a shows the pressure increase curve in the pressurizing chamber 34 and b shows the movement of the piston 38.

Next, when the piston 38 descends, the cylinder 33
The compressed air introduced into the pressurizing chamber 34 is passed through the communication port 35.
The air flows through the check valve of the speed controller 30' in a free flow state when the check valve of the speed controller 30' is fully opened, and is rapidly exhausted from the switching valve 31 through the passage 4 from the valve body 9, which is fully opened, so that the pressure at the outlet 3 decreases. The force of the pressure regulating spring 14 applied to the rapid exhaust valve 5 moves the valve body 9 forward and presses it against the valve seat 8, cutting off the flow of compressed air. Valve body 1 of flow control valve 7 being throttled
Flow occurs through the gap between valve seat 7 and valve seat 16.
In this way, by rapidly discharging the pressure commensurate with the weight of the heavy object 36 using the rapid exhaust valve 5, the stopping time of the piston 38 before the initial movement can be shortened. FIG. 7 compares the movement of the piston when it descends in the conventional pneumatic circuit configuration shown in FIG. 4 and the pneumatic circuit of this invention.
c shows the pressure drop curve in the pressurizing chamber 34 according to this invention, and d shows the movement of the piston 38 in that case. On the other hand, in the case of the conventional circuit configuration shown in FIG. 4, the pressure drop curve in the pressurizing chamber is c' and the movement of the piston is as d'.
In other words, in the case of this device, the time to the initial reaction is t ₁
In contrast, in the case of a conventional circuit configuration, a considerably long stop time of t ₂ must be expected. Note that after the compressed air corresponding to the weight of the heavy object 36 is rapidly exhausted, the rapid exhaust valve 5 is closed, and the piston 38 is maintained at a constant speed by the controlled flow (meter-out control) by the flow rate control valve 7. It is lowered. The circuit of the embodiment shown in FIG. 5 is used for the same purpose as that of FIG. 40, a pressure reducing valve 41 with a check valve constituted by a pressure reducing valve and a check valve.
By arranging this, low pressure can be applied to the chamber 39 on the rod side of the cylinder 33, thereby further shortening the stopping time leading to the initial movement during descent.

As described above, according to the flow control valve having a rapid exhaust mechanism as in the configuration of this invention, compared to the conventional flow control valve, as shown in Fig. 7, the operating time is greatly reduced due to the shortening of the starting time. It is extremely useful in practical terms for improving productivity, such as reducing work man-hours and costs.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of a flow control valve with a rapid exhaust valve, Figure 2 is a plan view thereof, Figure 3 is an explanatory diagram of a pneumatic circuit constructed using a flow control valve with a rapid exhaust valve, and Figure 4 is an explanatory diagram of a conventional pneumatic circuit, FIG. 5 is an explanatory diagram of an embodiment of a pneumatic circuit configured using a flow control valve with a rapid exhaust valve, and FIGS. Figure) and during descent (Figure 7)
Figures 8, 9 and 10 are cross-sectional views of conventional meter-in and meter-out speed controllers. . In the figure, 1...body, 2, 3...port, 4...passage, 5...quick exhaust valve, 6...passage, 7...flow control valve, 30...flow control valve with quick exhaust valve , 30'...Speed controller, 3
1... Directional switching valve, 32... Compressed air source, 33...
...Cylinder, 34...Head side chamber (pressurization chamber),
36...It is a heavy object.

Claims (1)

[Scope of utility model registration request] In those that raise and lower heavy objects using actuators used in pneumatic circuits,
A flow control valve with a quick exhaust valve having a quick exhaust function and a flow rate control function is disposed in the head side pipe between the cylinder of the actuator and the directional switching valve, and the flow control valve with a quick exhaust valve has a quick exhaust function and a flow rate control function. It consists of a rapid exhaust valve section that opens when the cylinder pressure is higher than the specified value, and a flow rate control valve section that performs meter-out control when the heavy load is lowered. A pneumatic circuit arranged in series between a flow control valve with exhaust valve and a cylinder.