JPS6030481Y2 - Cylinder with built-in valve mechanism - Google Patents

Description

[Detailed description of the invention] Normally, in an actuator, the speed of the piston that reciprocates within the cylinder body is adjusted using speed control using meter-out control, but when inspecting equipment at the end of work or elsewhere. Since the pressure inside the cylinder is atmospheric pressure, speed control is possible only when pressurized with meter-out. Therefore, under other conditions, speed control is impossible and the jig etc. This often results in damage or personal injury.
Workers are very nervous when starting work, which is a cause of decreased work efficiency.

Taking these points into account, there are many cases where speed controllers are used under meter-in control. In this case, the pressure rise time inside the cylinder changes depending on the inflow amount, and the slower the speed, the slower the pressure transmission. This will cause speed delays and loss of work.

The first purpose of this invention is to prevent the cylinder from popping out by meter-in control using a fixed throttle when the pressure inside the cylinder is atmospheric pressure (meter-out control when pressurizing), and the second purpose is to prevent the rod from popping out. The purpose is to reduce air consumption during the return stroke due to pressure reduction, and the third purpose is to eliminate the problem of two-pressure control by shortening the response delay caused by pressure reduction during the return stroke using a rapid exhaust valve. The fourth objective is to make the entire cylinder compact by integrating the above three functions into the cylinder.

In the figure, 1 is a cylinder body of an actuator, and a piston 2 is fitted into this cylinder body 1 so as to be able to slide in an air-water tight manner along the inner wall of this cylinder body 1, and a piston 2 is attached to this piston 2. The piston rod 3 is protruded out of the cylinder body 1, and the piston rod 3
The movement of the body is converted into the necessary work.

Both ends of the cylinder body 1, which is partitioned by the piston 2 into a first chamber 4 on the head side and a second chamber 5 on the rod side, are each closed by a cover 6.7. 7, a safety speed adjustment valve quick exhaust valve 8 is installed in the cover 6 on the head side, and a pressure adjustment valve 9 with a flow rate control valve is installed in the cover 7 on the rod side. The structure of No. 9 will be explained.

First, regarding the rapid exhaust valve 8 with Abi speed adjustment valve,
A vent 10 communicating with the chamber 4 and a directional control valve (
A port 11 leading to the port 1 (not shown) is provided.
A piston valve 12 is provided on the 0 side and is opened when the pressure in the chamber 4 rises above a predetermined pressure.
2 is kept in its closed position by the force of the spring 13, but even in the closed state, fluid is allowed to flow through the throttle 14.

Another piston valve 15 is held within the cover 6 in its closed position by a spring 16, and this piston valve 15 is opened by fluid pressure from the port 11 exceeding a predetermined pressure.

A throttle valve 17 is disposed near the piston valve 15, and its opening degree can be adjusted freely.

Although the diaphragm 14 is shown as a fixed diaphragm in the figure, it can also be a variable diaphragm.

A check valve 2 is provided in the passage 40 between the port 11 and the outlet 10.
0 communicates with the passage 10 by means of a spring 21
and the passage 40.

On the other hand, the pressure regulating valve 9 with a flow rate control valve is installed inside the cover 7, and the cover 7 is provided with a port 22 communicating with the chamber 5 and a port 23 leading to the direction switching valve side. A rod 26 is provided on the side of the passage 22 by a piston wall 25 loaded with a pressure set by a spring 24.
a valve body 27 of a pressure regulating valve maintained in an open position via;
A normal speed control valve consisting of a throttle valve 28 and a check valve 29 is arranged in series, and the check valve 29 resists the force of the spring 30 depending on the fluid pressure from the port 23 side. It is then pushed open and becomes a free flow.

In the above configuration, first, chambers 4 and 5 are at atmospheric pressure, and chamber 4
When pressure fluid is introduced into the chamber 4, the pressure fluid opens the piston valve 15 and passes through the restriction 14 of the piston valve 12 into the chamber 4.
The piston 2 is pushed and moved under meter-in control by the throttle 14, and prevents the piston 2 from running out of control under meter-out control.

Next, in the case of a work stroke in which pressure fluid is introduced into the chamber 4 while the chamber 5 is filled with pressure, the pressure fluid opens the piston valve 15 and the piston valve 12 is opened as in the previous case. It passes through the throttle 14 and is introduced into the chamber 4 .

At this time, the fluid in the chamber 5 is throttled and discharged by the meter-out control, so the pressure is high, the piston 2 does not move, the pressure in the chamber 4 increases, the piston valve 12 is opened, and the normal speaker operation is performed. A state similar to the free flow of the controller is reached and fluid is introduced into the chamber 4.

On the other hand, the pressure in the chamber 5 pushes open the valve body 27 of the pressure regulating valve against the spring 31, the flow rate is adjusted by the throttle valve 28, and the piston 2 is moved under meter-out control.

In addition, in the case of a return stroke to introduce pressure fluid in the chamber 5 while the chamber 4 is filled with pressure, the port 23
The pressure fluid supplied opens the check valve 29 against the force of the spring 30, passes through the valve body 27 of the pressure regulating valve, and flows into the chamber 5.

At this time, the pressure within the chamber 5 is adjusted to a predetermined pressure by the spring 24.

On the other hand, the piston valve 15 in the head-side cover 6 is in an open state when the chamber 4 is filled with pressure.

At the same time as the pressure fluid flows into the chamber 5, the pressure fluid in the chamber 4 opens the check valve 20 against the force of the spring 21, passes through the opened piston valve 15, and is rapidly exhausted.

Next, when the pressure in the chamber 4 drops below a predetermined pressure adjusted by the spring 16, the piston valve 15 is closed, and the flow rate of the pressurized fluid in the chamber 4 is adjusted by the throttle valve 17, and the piston 2 is Move with out control.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the cylinder of this invention, and FIGS. 2 and 3 are explanatory views showing the valve structure in more detail. In the figure, 1... cylinder body, 2...
... Zeston 3 @ ... Zeston Rod, 4.
5...Room, 6,7...Cover, 8...
...Rapid exhaust valve with safety speed adjustment valve, 9...
...Pressure regulating valve with flow rate control valve, 12... Zeston valve, 14... Throttle, 15... Zeston valve, 17... Throttle valve, 27... ... Valve body of pressure regulating valve, 28 ... Throttle valve, 29 ...
It is a check valve.

Claims (1)

[Scope of utility model registration request] It has a cylinder body in which the piston slides air-tightly,
Both ends of the cylinder body, which is partitioned into two chambers on the head side and the rod side by the piston, are closed with covers, respectively, and the cover on the head side has a piston valve that is opened by the pressure inside the head side chamber. and a piston valve that is opened by pressure on the directional valve side, the former piston valve forming a restriction on the flow of fluid toward the chamber, and a restriction valve provided near the latter piston valve. A quick exhaust valve with a safety speed adjustment valve is installed inside, and a pressure adjustment valve with a valve body that is closed when the pressure on the rod side exceeds a predetermined value is installed on the rod side cover, and a A cylinder that has a built-in valve mechanism that includes a pressure regulating valve with a flow rate control valve that includes a throttle valve that limits the flow rate of fluid toward the switching valve.