JPS6025013Y2 - Flow control valve used in meter-in type - Google Patents

Description

[Detailed description of the invention] Normally, in actuators used in pneumatic circuits, the speed of the piston that reciprocates within the cylinder is adjusted by
This is generally done using a speed controller with meter-out control, but when inspecting equipment after work or at other times, the pressure inside the cylinder is atmospheric pressure. Speed control is possible only when pressurized. Therefore, in conditions close to atmospheric pressure, speed control becomes impossible due to the compressibility of air, causing the piston to move suddenly, or jump out, and the jig In the past, when starting work, workers had to be extremely nervous, applying pressure to the side where the cylinder does not move, which often resulted in a decrease in work efficiency.

Taking these points into consideration, speed controllers are sometimes used in meter-in control as shown in Figure 1, but speed control is poorer than meter-out control, and speed controllers are used in meter-in control as shown in Figure 2. The pressure rise time in the cylinder at the end of the stroke changes depending on the inflow amount, and the slower the speed, the more the pressure transmission speed is delayed, which has the disadvantage of causing work loss.This method prevents work loss due to this delay. Moreover, the purpose of this invention is to always maintain a safe speed using meter-in control.

The basic structure of this device is to install a composite valve in the flow path inside the main body, consisting of a spring, offset, and pilot type two-position switching valve as a quick air supply valve, and a needle valve as a stop valve. If the pressure on the secondary side in the passage is lower than the pressure set by the spring, air is gradually supplied into the cylinder according to the needle valve ratio, the cylinder is driven by meter-in control, and the pressure in the passage becomes the set pressure. If the temperature is higher than that, the 2-point/2-position switching valve is opened and air is rapidly supplied into the cylinder.

Furthermore, a check valve disposed in parallel with the composite valve within the passage allows the cylinder internal pressure to be exhausted in a free flow manner.

Next, this invention will be explained with reference to an embodiment shown in FIG.

In Fig. 3, the main body 1 is provided with ports 2 and 3 for inlet and outlet, and a passage 4 connecting these ports 2 and 3 includes a spring, offset, and pilot type bow 12-position switching valve as a rapid air supply valve. 5 and a needle valve 6 as a crest valve are provided, and in parallel with this compound valve 7, a check valve 8 is provided that allows fluid to flow only from the port 3 side to the port 2 side. .

Next, the composite valve 7 and check valve 8 will be explained in more detail.

First, the composite valve 7 will be described as a cylinder in which a piston-shaped side wall 11 is integrally constructed with a valve body 10 that sits on a valve seat 9 formed in the main body 1, and this piston-shaped side wall 11 slides in an air-watertight manner. A cylindrical wall 12 is formed on the main body 1 .

an internally threaded cylindrical wall 1 extending from the cylindrical wall 12;
3, the seat body 14 and the piston-shaped side wall 11 are screw-fitted to each other.
A spring 15 is compressed between.

The pressure on the port 3 side is applied as a pilot pressure to the piston-shaped side wall 11, and the valve body 10 is separated from the valve seat 9 against the force of the spring 15, thereby opening the passage 4. In order to combine the needle valve 6 with the two-point/two-position switching valve 5, it can move forward and backward within a through hole 16 formed in the center of the valve body 10 and the piston-shaped side wall 11, and the tip thereof A threaded portion 21 is provided at the rear end of the needle 20, which can open and close the opening 19 formed between the horizontal hole 18 provided in the valve body 10 and the through hole 16. , this threaded portion 21 is attached to the seat body 1
It is screwed into a screw hole 22 provided in 4 and has its end protruding to the outside, and a turning groove 23 that can be turned with a screwdriver or the like is cut into this end.

Next, the check valve 8 will be explained. This check valve 8 opens the passage 24, which is formed in parallel to the passage 4 passing through the compound valve 7, only from the port 3 side to the port 2 side. This consists of a valve seat 40 formed on the main body 1, a valve body 25 seated on this valve seat 40, and a spring 26 that has the effect of elastically forcing this valve body 25 onto the valve seat 40. It is what it is.

The flow rate regulating valve having the above configuration is used as a meter-in type, and as shown in FIG. 3 is connected, and port 2 is connected to a pipe line 32 that communicates with the directional control valve 31.
Connect to.

On the other hand, on the rod side 34 of the cylinder 28, a variable throttle valve 35 and a check valve 36 are formed in parallel with the variable throttle valve 35.
A speed controller 37 is provided.

In this case, when the pressure on the head side 33' is P□ and the pressure on the rod side 33 is P2, the piston 29 in the cylinder 28 moves in both directions F and F', and the pressure in the cylinder 28 P□ and Figure 5 shows the change in P2.

Pressure is supplied to the head side 33' of the cylinder 28 of the actuator 27 in the following manner.

That is, in FIG. 5, the piston 29 of the cylinder 28 moves to the right and the pressure on the port 3 side is low until it reaches the stroke end, so the valve body 10 as shown in FIG.
Since the valve body 10 is pushed down by the force of the spring 15 loaded on the valve seat 9, the directional control valve 3
The supply pressure from 1 is gradually supplied from a to b through an opening 19 formed between a horizontal hole 18 provided in the valve body 10 and the through hole 16.

When the pressure inside the head side 33' further increases to C when reaching the stroke end, the piston-shaped side wall 11 is pressed, the valve body 10 is fully opened, and the supply pressure is rapidly supplied into the head side 33' from C to d.

On the rod side 33, evacuation occurs quickly and without resistance via the check valve 36 of the speed controller 37.

When the supply of air which causes the movement of said piston 29 in the direction of arrow F', contrary to the movement of said piston 29 in the direction of arrow F, takes place via line 34, the head side 33
The pressure inside ' is exhausted through the check valve 8 in a free flow without resistance.

The supply of air to cause the movement of the piston 29 in the direction of the arrow F is performed by adjusting the opening degree of the needle valve 6 by rotating the threaded portion 21, and the speed can be freely adjusted.
In addition, by adjusting the force of the spring 15 by rotating the seat plate 14, the force of the spring 15 can be adjusted according to the load condition of the actuator 27, and a rapid air supply function at the end of the stroke can reduce the pressure in the head side 33'. can be shortened.

A comparison of the rightward movement of the piston in the conventional pneumatic circuit configuration shown in Fig. 1 and in the pneumatic circuit using the flow rate regulating valve of this invention as shown in Fig. 4 is shown. 6, in this figure, e indicates the pressure curve of the pressure P□ on the head side 33 according to this invention, and the pressure P1 is supplied only from the opening 19 from g to h, and furthermore, after the end of the stroke, When the pressure increases from h to i, the valve body 1 is fully opened, so the supply pressure is rapidly increased to k, and the supply pressure is reached at time t□ after reaching the stroke end.

On the other hand, in the case of the conventional circuit configuration shown in FIG. 1, the state of pressure change is the same from g to i, but from i to 1,
Since the pressure is gradually supplied by 9, it takes a long time of 2 hours after reaching the stroke end, so compared to the case where the flow rate adjustment valve of this invention is used, the pressure transmission is delayed by time (t'-tl). will occur.

In this way, the flow rate regulating valve with a rapid air supply function as configured in this invention prevents a decrease in work efficiency due to a delay in pressure transmission time compared to a conventional speed control roller, and also allows for meter-in control. In terms of productivity improvement, such as being able to always maintain safe speed,
Extremely useful.

[Brief explanation of the drawing]

In the figure, Fig. 1 is a diagram showing an embodiment of a conventional circuit, Fig. 2 is a graph showing a pressure fluctuation state in the circuit of Fig. 1, and Fig. 3 is a vertical cross section of an embodiment of the invention. Fig. 4 is a diagram schematically showing an example of usage, Fig. 5 is a graph showing the pressure fluctuation state in the usage example as shown in Fig. 4, and Fig. 6 is a graph similar to Figs. 3 is a graph showing a pressure fluctuation state according to the circuit example shown in FIG. In the figure, 1... main body, 2, 3...
...Port, 4...Passage, 5...2 point/2 position switching valve, 6...Crest valve, 7...
...Compound valve, 8...Check valve, 9...
・Valve seat, 10... Valve body, 11...
Zestone-shaped side wall, 12... Cylindrical wall, 1
3... Internally threaded cylindrical wall, 14... Seat body,
15...Spring, 16...Through hole, 17...Tip, 18...Horizontal hole, 19...Opening , 20... Needle, 21... Threaded portion, 22... Threaded hole,
23... Rotation groove, 24... Passage, 2
5... Valve body, 26... Spring, 2
7... Actuator, 28... Cylinder, 29... Piston, 30, 32...
...Pipe line, 33...Rod side, 33'...
...Head side, 34...Pipe line, 35...
・Variable throttle valve, 36...Check valve, 37.
38---Speed controller, 39...
...Variable throttle valve, 40...Valve seat.

Claims (1)

[Claims for Utility Model Registration] l1 A main body having two ports for air ingress and egress and a passageway for communicating these ports, and said passageway within this main body can be opened and closed by pressure from a secondary side port. The rapid air supply valve has a crest valve formed in parallel with the passageway and narrows the opening in the rapid air supply valve part. A meter-in, type flow regulating valve consisting of a check valve that allows flow in only one direction. 2. The flow rate regulating valve according to claim 1, wherein the crest valve is a needle valve. 3. The flow rate regulating valve according to claim 1, wherein the rapid exhaust valve is a two-point, one-to-two position switching valve of a spring and offset pilot type with adjustable switching pressure. 4. The flow rate regulating valve according to any one of claims 1 to 3, which is a composite valve by combining the crest valve and the rapid air supply valve.