JPS6014202B2 - air cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cylinder in which the amount of extension of the cylinder can be changed in three stages, and the third layer switching valve can be operated by air pressure.

A fluid pressure cylinder is generally used to switch and operate the second layer switching valve, but it is very difficult to stop this fluid pressure cylinder at an intermediate position, so for example, It is not suitable for the position where the 3rd position counterfeit switching valve is switched.

For this reason, devices for remotely controlling the 3-position direct switching valve are generally either mechanical devices consisting of a control lever and control rod, or electrical devices, but in the former case, remote control is difficult. In the latter case, the operating force is weak and the cost is high. In view of the above points, the present invention provides an operating device that is easy to operate remotely and is not very expensive.
This invention provides an air cylinder that can reliably switch and operate a layer switching valve and the like using air pressure, and examples thereof will be described below with reference to the drawings.

1 consists of a small-diameter tip cylinder 2 whose base end is closed and a large-diameter base cylinder 3 whose tip is closed, which are bolted to flanges 4 and 5 provided on each cylinder 2 and 3 and connected in a sealed manner. 6 is a fixed piston that penetrates the tip wall of the tip cylinder 2 and is fixed to the approximate center of a piston rod 7 fitted in the cylinder body 1 so as to be able to freely slide. A free piston passes through the base of the piston rod 7 and is slidably mounted on the base of the piston rod 7, and is slidably iron-fitted within the base cylinder 3. Inside the cylinder body 1 is a fixed piston 6. And the free piston 8 has a tip chamber 9, an intermediate chamber 10, and a base chamber 11.
It is divided into three rooms.

The free piston 8 collides with a stopper 12 formed approximately at the center of the inner wall of the cylinder body 1, so that the amount of movement toward the tip side is restricted, and the fixed piston 6 and the free piston 8 collide with each other. In this case, a cylindrical portion 13 is fixed to the free piston 8' so that the intermediate chamber 10 can be maintained at an appropriate size, and the tip of the cylindrical portion 13 comes into contact with the side surface of the fixed piston 6.

Incidentally, inlets and outlets 14 and 15 are provided at the tip and base ends of the cylinder body 1 to communicate with the air pump and allow high-pressure air from the air pump to flow in and out of the tip chamber 9 and the base chamber 11. Moreover, the pressure receiving area acting on the fixed piston 6 facing the tip chamber 9 is made larger than the pressure receiving area acting on the proximal end surface of the piston rod 7 facing into the base chamber 11.

Further, the pressure receiving area of the free piston 8 facing the base chamber 11 is made larger than the pressure receiving area of the fixed piston 6 facing the tip chamber 9. Reference numeral 16 is a port hole for transporting the air and the intermediate chamber 10.

The present invention is constructed as described above, and when the piston rod 7 is to be brought into the state shown in FIG. 2, where the piston rod 7 is at its minimum distance from the intermediate position shown in FIG. If so, both the fixed piston 6 and the free piston 8 move toward the base, and the piston rod 7 contracts to the minimum. Next, in order to restore the state shown in FIG. 1 from FIG. acts on the side surface of the free piston 8 facing into the base chamber 11 and the base end surface of the piston rod 7, so even if air pressure is acting on the side surface of the fixed piston 6 facing the tip chamber 9, this Overcoming the force, both the free piston 8 and the piston rod 7 move toward the front side, and when the free piston 8 aligns with the stopper 12 as shown in FIG. 1, the force acting on the fixed piston 6 and The relationship with the force acting on the end surface of the piston rod 7 remains, and since the pressure receiving area of the fixed piston is larger than the pressure receiving area of the end surface of the piston rod 7, the piston rod 7 does not move any further toward the tip end. Return to the intermediate position again.

Further, in order to change the state shown in FIG. 3, where the piston rod 7 is fully extended from the state shown in FIG. If this is done, the piston rod 7 will be extended to the maximum due to the air pressure acting on the end surface of the piston rod 7.

Moreover, in order to return the state shown in FIG. 1 from the state shown in FIG. As a result, the piston rod 7 moves toward the base side and returns to the intermediate position.

In the above embodiment, the structure was simplified by using cylinders of different diameters, but if cylinders were to be constructed with cylinders of the same diameter, a structure in which the stopper would protrude from the inner wall approximately at the center of the cylinders would provide the same satisfaction as described above. It is possible. As described above, the air cylinder of the present invention, despite the simple control of inflowing and outflowing high-pressure air from an air pump into two locations, the tip and base of the cylinder, The switching valve can be reliably switched and operated by air pressure, and the number of parts is very small, so it can be manufactured at low cost.

[Brief explanation of the drawing]

1 to 3 are cross-sectional views showing the air cylinder of the present invention, with FIG. 1 showing the intermediate position, FIG. 2 showing the lowest position, and FIG. 3 showing the most extended position. 1 is a cylinder body, 6 is a fixed piston, 8 is a free piston, 12 is a stopper, and 14 and 15 are entrances and exits. [Traditional] Prisoner 2 drawings 8 drawings

Claims (1)

[Claims] 1 A cylinder body 1 with a stopper 12 provided on the inner wall of the cylinder body 1 approximately at the center, a piston rod 7 whose tip end passes through the tip wall of the cylinder body 1 and whose base side is housed inside the cylinder body 1, and a tip end side inside the cylinder body 1. A fixed piston 6 is slidably fitted into the piston rod 7 and fixed integrally with the piston rod 7, and a fixed piston 6 is slidably fitted into the base side of the cylinder body 1 and penetrates through the base of the piston rod 7. The free piston 8 is controlled so that it can move between the stopper 12 and the base end of the cylinder body 1, and the base side pressure receiving area of the free piston 8 is controlled by the fixed piston 6. The pressure receiving area on the tip side of the fixed piston 6 is made larger than the pressure receiving area on the base end surface of the piston rod 7, and the cylinder body 1 is connected to two locations, the base and the tip, to the air pump. Entrance/exit 14, 15
Air cylinder made by drilling.