JPS6039524Y2 - Cylinder with pop-out prevention valve - Google Patents

Description

[Detailed description of the invention] This invention relates to a cylinder with a pop-out prevention valve.
For example, the purpose is to prevent accidents caused by residual atmospheric pressure in the cylinder during inspection and repair, and to maintain a safe speed of the piston.

Normally, for example, in an actuator, the speed of a piston reciprocating within a cylinder is adjusted using a speed control valve under meter-out control. Since the pressure is atmospheric pressure, speed control is possible only when pressurized with meter-out, and therefore speed control is impossible under other conditions, resulting in damage to jigs, etc., or personal injury. In many cases, workers are very nervous when starting work, which causes a decline in work efficiency.

Taking these points into consideration, there are many cases where the speed control valve is used under meter-in control (see Japanese Utility Model Publication No. 44-25433), but in this case, the cylinder pressure rise time depends on the inflow amount. changes, and the slower the response speed,
There are problems such as a delay in pressure transmission speed.

In addition, the meter-in and meter-out circuits each incorporate a switching valve, a throttle, etc.
(see Publication No. 1), but these have drawbacks such as a complicated structure and an increase in size as a whole.

This invention was made with the intention of solving the above problem, and includes a restriction that forms a narrow passage from the chamber toward the port in the passage of the fluid inlet/outlet port that communicates with the chamber partitioned by the piston. When pressurized fluid is forced into the chamber from this port side to push the piston, the pressure fluid is initially throttled by the throttle, and as the pressure inside the chamber increases, the throttle is disabled, and the piston is moved in the opposite direction. A pressure-responsive member comprising a piston-like member that is combined with the throttle so that the throttle initially acts like a meter-out control even when the throttle is moved, and then the throttle is disabled as the pressure in the chamber increases to a certain extent. By incorporating a pop-out prevention valve consisting of a The present invention is intended to provide a cylinder with a pop-out prevention valve.

Examples of this invention will be described below based on the drawings.

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 is attached to this piston 2. The piston rod 3 protrudes outside the cylinder body 1 and is connected to the piston rod 3.
The movement of people is now being converted into the work they need.

Both ends of the cylinder body 1, which is partitioned into two chambers 4 and 5 by the piston 2, are each closed with a cover 6.7, and in the illustrated embodiment, this device is installed in the cover 6 on the head side. A pop-out prevention valve 8 is formed.

The structure of this valve 8 will be explained below.
can also be formed in the cover 7 on the rod side, and if necessary, on both the head side and rod side covers 6゜7.
They may be formed together inside.

In the embodiment shown in FIG. 1, the pop-out prevention valve 8 has a passage 10 between the chamber 4 and a fluid inlet/outlet port 9 provided in the cover 6, and a part of the passage 10 is formed into a narrow passage 11.
and a diaphragm 12 that is combined with the diaphragm 12 to
The pressure-responsive member 13 acts to disable the throttle 12 when the internal pressure rises above the level that the throttle 12 is attached to, and the pressure-responsive member 13 is connected to a piston-like member 14 to which the throttle 12 is attached. , this piston-shaped member 1
a spring 15 that applies a predetermined spring force to the spring 4;
It is composed of a catch seat 16.

The other cover 7 is provided with a fluid inlet/outlet port 17 that communicates with the chamber 5 .

In the above configuration, a speed control valve 20.21 is disposed in each fluid supply line 18.19 from a directional control valve (not shown) to each port 9.17.

The pressure fluid supplied from the directional control valve to the port 9 via the conduit 18 is initially introduced into the chamber 4 through the narrow passage 11 formed by the throttle 12, and as the pressure in the chamber 4 increases, the The piston-like member 14 is pushed and the diaphragm 12
is disabled, and from then on, fluid is supplied with the passage 10 fully open, allowing the piston 2 to operate rapidly.

Also in the case of the movement of the piston 2, the throttle 12 initially acts like a meter-out control, ie the pressure fluid is initially throttled by the throttle 12, and then as the pressure increases to the extent that the chamber 4 is formed, the piston-like member 14 is The rapid movement of the piston 2 is suppressed by disabling the throttle 12 by being pushed.

FIG. 2 shows a second embodiment of this invention, in which the narrowed passage 11 can be adjusted.

That is, the shaft frame 22 is attached to the aperture 12 so that the shaft frame 22 penetrates the piston-like member 14 and the catch seat 16 and protrudes to the outside. The threaded part 23 is screwed into the threaded hole 24 of the catch seat 16, and the tip of the driver is engaged with the groove 25 formed on the end surface of the shaft frame 22 and rotated to move the diaphragm 12 forward and backward, thereby eliminating the stenosis. This is a case where the speed of the passage 11 is adjusted, that is, the throttle is made variable so that arbitrary speed adjustment can be performed.

Note that the other structures and functions are the same as those of the embodiment shown in FIG. 1, so the same parts are given the same reference numerals and the explanation thereof will be omitted.

As explained above, according to the cylinder with a pop-out prevention valve of this invention, the entire structure can be made compact, work loss due to delay in pressure transmission speed can be prevented, and the orifice 12 A safe speed can be maintained by the action of the pressure-responsive member 13 having the piston-like member 14 combined therewith, and moreover, accidents due to residual atmospheric pressure in the cylinder can be prevented during inspection and repair. Its utility value is remarkable because it can provide excellent effects such as.

[Brief explanation of the drawing]

In the drawings, FIG. 1 is a vertical sectional view of one embodiment of this invention, and FIG. 2 is a vertical sectional view of the main part of the second embodiment. In addition, in the figure, 1... cylinder body, 2...
... Piston, 4,5... Chamber, 6. 7-
------Cover 8... Pop-out prevention valve, 9.
...Fluid inlet/outlet port, 10...Passage, 11...Narrowed passage, 12...Restriction,
13...Pressure responsive member, 14...Zeston-like member.

Claims (1)

[Claims for Utility Model Registration] 1. A cylinder body having a cylinder body in which a piston slides air-tightly, and covering both ends of the cylinder body partitioned by the piston into two chambers, a head side and a rond side. In the case where the cover is closed with a fluid inlet/outlet port, a constricted passage is formed between at least one of these ports and the chamber on that side from this chamber toward the port. When pressure fluid is forced into the chamber from the side of this port to push the piston, the pressure fluid is initially throttled by the throttle, and as the pressure inside the chamber increases, this throttle is disabled, and Even when the piston moves in the opposite direction, the throttle initially acts as a meter-out control, and then as the pressure in the chamber increases to a certain extent, a piston-like member combined with the throttle is used to disable the throttle. A cylinder with a pop-out prevention valve comprising a pressure responsive member. 2. The aperture is a variable aperture. A cylinder with a pop-out prevention valve according to claim 1 of the utility model registration claim.