JPH022046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid opening/closing valve that can perform the flow of preheating oxygen, fuel gas, and cutting oxygen in a series of operations when cutting steel materials, and can instantaneously shut off the flow. be.

When a conventional gas cutting torch is installed in a portable automatic cutting machine to cut steel materials, the preheating acid, fuel gas, and cutting oxygen valves are opened and closed as appropriate. The opening degree had to be adjusted to create a preheated flame and high pressure oxygen suitable for cutting, resulting in poor work efficiency.

In addition, in an automatic gas cutting machine, an electromagnetic on-off valve is installed in each fluid supply path, and the movement of the cutting machine is stopped via a limit switch that detects a predetermined position while the cutting machine is running, and the electromagnetic on-off valve is instantly closed. Means for automating the completion of the cutting operation has been used, but this method requires a plurality of electromagnetic on-off valves and their control devices, making the device large and complex, resulting in high manufacturing costs.

The present invention relates to a completely new valve developed in view of the above-mentioned drawbacks of the conventional valve, which has a simple structure, is reliable and quick to operate.

One embodiment of the present invention will be explained with reference to the drawings.
In the figures, A is an on-off valve according to the present invention, and a valve body 1 has passages 2 communicating fluid inlets and outlets that are arranged in parallel so that fuel gas, preheating gas, and cutting oxygen can be supplied respectively. A valve seat 3 is provided on the inlet side of these passages 2. Reference numeral 4 denotes a valve body that can freely slide within the passage 2 on the inlet side of the main body 1, and has a hemispherical head 5 at the rear.
An actuating rod 6 having a diameter is connected thereto, and the valve body 4 is brought into contact with a valve seat 3 provided in the passage 2 by a spring 7. Next, reference numeral 8 denotes a slide rod that is slidably fitted into a hole 9 bored in the rear end of the main body 1, and is inserted into the cutting sequence so that the head 5 of the actuating section 6 can fit therein. Therefore, the groove width was determined 3
ring grooves 10 are bored. Note that the rear end of the passage 2 on which the operating rod 6 can slide is a slide rod 8.
The head 5 of the actuating rod 6 is always pressed against the slide rod 8 in the hole 9 by the action of the spring 7, and the three actuating rods 6
The head of the slide rod 8 is configured to fit into the three ring grooves 10 of the slide rod 8. Also slide rod 8
A spring 11 is fitted into one end of the spring 11, and a mold 12 having a convex portion is fixed to the mold 12. The mold 12 communicates with a limit switch 13 to form an operating portion 14 of the slide rod 8, and the other end has a mold 12 having a convex portion. A ring groove 15 is bored, and a pin 16 and an auxiliary bar 17 are formed.
An operating lever 19 is attached to the bracket 18 so as to be rotatable about the fixed point of the bracket 18. Reference numeral 20 denotes a spring attached to the end of the bracket 18, the end of which is configured to be able to fit into the ring groove 15 of the slide rod 8, and which is attached to the end of the bracket 18.
The engagement state between the spring 20 and the ring groove 15 can be released by rotating the dog-shaped trigger 22 which is rotatably attached via a pin 21 to the ring groove 15. One end is in contact with a stopper 23. In addition, the fluid inlet of the main body 1 has a nipple 2 for connecting a hose.
4 are screwed together, and an O-ring 25 for preventing gas leakage is installed at a predetermined position on the nipple 24 and the operating rod 6.
is provided. 26 is a nipple provided at the fluid outlet.

The opening/closing relationship between the actuating rod 6 and the slide rod 8 and the relationship between the actuating rod 6 and the fluid in the above embodiment are as follows.
When the head 5 of the slide rod 8 is inserted into the ring groove 10 of the slide rod 8, the valve body 4 comes into contact with the valve seat 3 and is closed so that no fluid flows. When the valve body 4 comes into contact with the wall, the valve body 4 is pushed in the distal direction by the outer circumferential wall of the slide rod 8 together with the operating rod 6, so that the valve seat 3 is opened and fluid can flow.

Next, to explain the operation of the valve according to the present invention, when the lever 19 is moved to the X position as shown in FIG. 2 and the slide rod 8 is slid, the three operating rods 6 are moved as shown in FIG. The heads 5 are respectively fitted into the ring grooves 10, and the valve body 4 is pressed by the spring 7 to close the valve seat 3, so that all fluid flow is stopped. Next, when the lever 19 is moved to the Y position, as shown in FIG. The upper two valve seats 3 are opened because they are pressed by the wall.
Only the fuel gas fluid and the preheated oxygen fluid are allowed to flow, thereby preheating the steel plate to be cut.Finally, when the lever 19 is moved to the Z position, the slide rod 8 moves and the lowermost The head of the actuating rod 6 also escapes from the ring groove 10 and is pressed by the outer circumferential wall of the slide rod 8, so that the lowermost valve seat 3 is also opened as shown in FIG. Cutting of the steel plate to be cut can be started by allowing the fluid to also flow out. At this time, the end of the spring 20 fits into the ring groove 15 of the slide rod 8, keeping the valve open.

When the prescribed gas cutting work is completed, the trigger 22 hits the stopper 23 due to the external force that collided with the block for stopping the carriage, and the trigger 22 rotates as shown by the broken line in FIG. 2 and fits into the ring groove 15. The end of the spring 20 that was previously held is pushed down to release the fitted state between the ring groove 15 and the spring 20. As a result, the slide rod 8 is instantly slid by the spring 11 attached to the other end of the slide rod 8, and all the operating rods 6 are moved as shown in FIG.
The head 5 of the slide rod 8 is inserted into the ring groove 10 of the slide rod 8, and all fluid circulation is closed to instantly and automatically stop the gas cutting operation. still,
At this time, the open/closed state of the valve is automatically determined and transmitted by a mold 12 fixed to the end of the slide rod 8 and a limit switch 13.

In conventional portable automatic gas cutting machines, the gas opening and closing operations were done manually, so the operator had to stand by near the cutting machine at the end of the cutting process, so it could only be operated by one worker. Although there was a limit to the number of units, in the present invention, as mentioned above,
According to the gas cutting sequence, several valves can be opened and closed automatically in a certain order to supply or stop several types of fluids, so one operator can simultaneously handle more than ten cutting machines. Further, the valve according to the present invention has a simple structure, can be made compact, can be produced at low cost, and has few failures.

[Brief explanation of drawings]

FIGS. 1 to 4 are explanatory diagrams showing the main parts and operating states of the valve of the present invention. A is the opening/closing valve, 1 is the valve body, 2 is the passage,
3 is the valve seat, 4 is the valve body, 5 is the head, 6 is the operating rod,
7, 11, 20 are springs, 8 is a slide rod,
10 and 15 are grooves, 19 is an operating lever, 22 is a trigger, and 23 is a stopper.

Claims (1)

[Scope of Claims] 1. A valve body with an operating rod connected to the rear thereof is slidably inserted into a flow passage of a valve body having a valve seat inside thereof via a spring, and the flow passage is connected to the rear of the valve body. A hole is drilled that intersects with the hole, and a slide rod with a cutting sequence programmed is inserted into the hole, and by sliding the slide rod, the actuating rod in contact with the outer circumferential surface of the slide rod is slid to open and close the valve. In a fluid opening/closing valve that performs A fluid opening/closing valve characterized in that a mechanism for releasing the fixing mechanism is provided. 2. Claim No. 2, characterized in that a mold is fixed to one end of the slide rod, and a limit switch is provided on the bracket that is activated by the movement of the mold, and the driving power source is opened and closed in response to opening and closing of a valve. The fluid opening/closing valve according to item 1.