JPS6246074A - Operating mechanism for air pilot valve - Google Patents

Abstract

PURPOSE:To rapidly operate an air pilot valve, by storing the movement of a piston as the force of a coil spring, and by reversing a bellevile spring when the stored force exceeds a predetermined value. CONSTITUTION:When a piston is moved approaching the terminal end of a cylinder, it presses a rod which therefore moves while it compresses a coil spring 3. Further, a push button 4 is stationary until a bellevile spring 6 is reversed. The piston is further moved together with the rod 2. When the compression force of the coil spring 3 exceeds the reversing force of the bellevile spring 6, the bellevile spring 6 is instantly reversed, and therefore, the push button 4 is also instantly moved to a position which is limited by a flange 7. At that time, the push button 4 opens an air pilot valve 11, simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the control of pneumatic machines, such as an operating mechanism that detects the movement of a piston and rapidly switches open and close a valve in interlocking pistons of an air cylinder.

[Conventional technology and problems]

FIG. 3 shows an example of the prior art. Conventionally, the rod and the push button are integrated, and a disc spring A is not provided. Therefore, the piston position is detected at the rear end of the push button 4, and the amount of piston movement is transmitted to the air pilot valve 11.
Opening of the air pilot valve 11 [1 area becomes analog, and the switching spool in the main switching valve 13 shown in Figure 2 moves gradually, so during the transition period of switching, the air pressure is supplied to and discharged from the air cylinder. Since it is not possible to instantaneously move to a position where all sides communicate, air pressure may be supplied to both ends of the air cylinder at the same time, causing the piston to stop interlocking. or,
When the reciprocating movement of the piston is fast, the opening time of the air pilot valve is shortened, and the switching spool does not move completely due to insufficient air supply to the main switching valve, resulting in the former phenomenon. In order to eliminate this drawback,
There is also a method of using a solenoid valve, but it requires a power source in addition to an air source, and has the drawback of short electrical life because it requires frequent operation, and must be of explosion-proof construction in order to be used in an explosive atmosphere. There are drawbacks such as.

[Object of the Invention] The object of the present invention is to eliminate these drawbacks and provide an operating mechanism for an air pilot valve that stores the movement of the piston as the force of a coil spring and operates rapidly by reversing the disc spring.

[Structure of the invention]

-L- In order to achieve the object, the present invention includes a rod for detecting the position of the piston, a coil spring for accumulating force, a push button for operating the air pyro/top valve, and a piston for rapidly reversing with a certain amount of force. It is characterized by a combination of a disc spring that quickly recovers under a certain amount of force, a flange and a guide to hold the spring, and is attached to the air sill body.

〔Example〕

FIG. 1 is an embodiment of the present invention, and FIG. 2 is a sectional view of an embodiment of an air cylinder incorporating the present invention. 1st
In the figure, a rod 2, a coil spring 3, and a push button 4 are assembled into a guide 1, which is held down by a kite 5 and a bolt.

Furthermore, countersunk screws 6 are opposed to the opposite side of the push button 4 from the coil spring 3, and these are fixed to the sill main body 8 by a flange 7 and bolts. 0-rings 9 and 10 are for sealing the air inside the shilling.

In FIG. 2, the mechanism 14 of the present invention is attached to both ends of the shilling body 8, and the main switching valve 13 is attached to the side surface of the shilling body 8, and is connected to the air pilot valve 11 by a tube.

Now one side of the shilling via the main switching lubricant 13 [
Air flows in from L, and when the piston 12 moves and approaches the end of the shilling, it pushes the rod 2 and moves while compressing the coil spring 3. However, the push button 4 remains stationary until the countersunk 6 is reversed. When the piston 12 moves further and the rod 2 moves with it, the compressive force of the coil spring 3 exceeds the reversing force of the countersunk/hook 6, and the countersunk screw 6 instantly reverses, and the push button 4 also instantly flange. Move to the position restricted in step 7. At that time, the push button 4 instantly opens the air pilot valve 11.

When the air pilot valve 11 opens, the main V''
Pilot pressure is applied to the pilot)fM working part on one side of the switching valve, the switching spool moves and the inlet and outlet of the air cylinder are switched, and the piston 12 moves, so the lot 2 is also pushed by the coil spring 3. Move backwards and return to the original position,
When the compressive force of the coil spring 3 becomes weaker than the restoring force of the disc spring 6, the disc spring 6 restores itself and the push button 4 instantly returns to its original position.The air pilot valve 11 also instantly closes and the pylon 1 pressure returns to the atmosphere. However, the position of the spool of the main switching valve 13 is maintained. Similar mechanisms are installed at both ends of the air cylinder, so that the reciprocating motion of the piston is automatically repeated by acting on the intersection If.

〔Effect of the invention〕

As is clear from the explanation below, according to the present invention, an analog operation is converted into a digital operation with a simple structure,
This has the effect of providing a mechanism for reliably operating the air pilot valve. Furthermore, by creating an operation delay due to the difference between the reversing force and the restoring force, the pilot air supply time to the main switching valve becomes longer, which has the effect of providing a mechanism for reliably operating the main switching valve.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, the second is a cross-sectional view of an example of an air cylinder incorporating the present invention, and the third is a cross-sectional view showing a conventional embodiment.

Claims (1)

[Claims] 1. A rod that detects the piston position of the air cylinder, a coil spring that contracts as the rod moves, a push button that holds the other end of the coil spring and activates the air pilot valve, and a button that presses the other end of the coil spring and operates the air pilot valve. An air pilot valve operating mechanism characterized by having a disc spring that flips over when the button is pressed, causing a snap action of the push button.