KR830002710Y1 - Gas saving circuit device when using torch - Google Patents

Abstract

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Description

Gas saving circuit device when using torch

1 is a conventional circuit diagram.

2 is a circuit diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

A: torch time regulating relay B: torch cutting time relay

C: torch cutting relay D: oxygen cutting

E: Torch clamp solenoid valve F: Preheating gas ON relay

G: Preheated oxygen solenoid valve H: Preheated L.P gas solenoid valve

I: Oxygen delay time relay J: Gas limit time relay

The present invention cuts the billet and slab produced during the continuous casting process in a steel mill to a certain length to be suitable for the rolling process. In this method, the torch is cut using a mechanical cut and a gas. (Touch) There is a cutting method, which relates to LP gas and oxygen savings when cutting with a torch.

In the conventional torch cutting method, the torch is always kept ignited until the next cutting operation after cutting for the set length. However, LP gas loss was incurred, but the LP gas was lost by inserting the device into the circuit. It can achieve the purpose of cutting with only about one tenth of the gas which was consumed conventionally, and it also saves a lot of oxygen additionally, and also needed one assistant to ignite the torch every time the first cutting operation was performed. In the torch part where the ambient temperature is high temperature, the LP gas and the oxygen valve are automatically adjusted by inserting a circuit developed by the control panel without any device or facility. Ignition soil using heat from the surface of the sweep without the ignition required for the torch It was developed by Rock. In addition, the operator can install the switching device freely in three steps: automatic, semi-automatic and manual, as the intention of the operator, and can increase the productivity and productivity.

The operation effects and circuits will be described in detail as follows. Referring to the conventional use (FIG. 1), when the operator forces the torch crater and then operates the length setting limit switch LS ₁ , the relay TCTR and the timer TCT are turned on. The torch clamp solenoid valve (Sol. V.) connected to the contact point A of the relay opens, bringing the torch to the cutting part of the billet, and the torch that was ignited for heating heats the cutting part. In order to equalize the speed of the billet and the torch by the billet export speed, the torch clamp is advanced like the billet by holding the billet.

Timer (TCT) 5 seconds after the high-pressure oxygen valve by the (G) is opened billet while being cut starts self-holding is a is held by the torch clamp limits the limit of the limit switch (LS ₂₎ a limit switch (LS ₂₎ When operated, the torch clamp retracts and returns to its initial state, waiting for the next cutting process.

This is a cycle of cutting. Here, the L.P gas and the low pressure oxygen that preheats the cutting part during the cutting of the billet, that is, the mixed gas, will continue to be consumed even while waiting for the length set to enter the next cutting. Therefore, the circuit of FIG. When inserted, the torch ignites the torch to extinguish the gas.

Referring to FIG. 2 specifically, the relay TCTR is turned on by the length setting limit switch LS ₁ in a state where the preheating gas relay F is turned on, and thus all the above processes are operated in the same manner. (R ₁ ), Oxygen Delay Time Relay (T ₁ ) and Gas Time Limit Relay (T ₂ ) are also turned on at the same time, bringing the torch to the billet cutting part by clamp, and contact A and gas timeout of relay (R ₁ ). The LP gas valve (H) is opened by the contact b of the relay (T ₂ ), and after 1.5 seconds of ignition by the heat of the temperature (approximately 900 ° C.) during billet extraction, the low pressure oxygen valve (G) is released by the timer (T ₁ ). ) Is opened to preheat the cutting part, advances at the same rate as the billet speed by the clamp, and after 5 seconds by the timer (TCT), the high pressure oxygen valve (G) opens and the material starts to be cut. In addition, LP gas valve (H) is turned off after 10 seconds by LP timer and relay (TCTR) is turned off by completely cutting the billet with remaining gas and high pressure oxygen in the pipe and operating the torch clamp limit limit switch. It returns to its original state, where the oxygen valve is also locked and fully extinguished into standby with no gas consumption until the next cutting process.

In addition, the switch panel is placed on the operation panel, and the automatic, semi-automatic, and manual three-step method is adopted to easily select the operation when the billet is cooled or when the operator deems it necessary. In this case, the contact of the gas timeout relay (T ₂ ) loses its function, so the relay (R ₁ ), that is, the ignition state is fired until the relay (TCTR) is turned off, and in the case of manual operation, the relay (R ₂ ) is turned on. All the automatic conditions after the preheating gas on relay (TCR ₁ ) contact have lost their function and continue to ignite in the torch crater, allowing the operator to cut freely from the cooled material.

Therefore, the present invention, unlike the conventional method of continuously consuming gas even in the standby state, controls the gas to be used only when necessary by the gas time limiting relay (T ₂ ) and cuts off oxygen at the same time as the return signal. It prevents the loss of the signal and ejects only the gas at the same time as detecting the cutting signal, automatically ignites with the billet heat, and even in the case of manual operation, the fully cooled billet can be cut as in the heated state. It is possible to cut a billet that requires a lot of heating while ejecting it until the LP gas receives a return signal, and has the advantage of being able to cut all billets by the automatic, manual and semi-automatic roles as described above.

Claims (5)

It is equipped with a preheating gas relay (F) and a length setting limit switch (LS1) and at the same time a torch time regulating relay (A), a torch cutting time relay (B), an oxygen delay time relay (I) and a gas time limit relay ( In the circuit device to save gas when using the torch, J) is preheated by ignition by the oxygen delay time relay (I), and enters the standby state by extinguishing by the gas time limit relay (J) after cutting the billet. The gas saving circuit device of the torch using the torch, wherein the ignition is automatically ignited by the oxygen delay time relay (I) in the next cutting process, and the cutting is performed in the above operation sequence. The gas saving circuit device according to claim 1, wherein an oxygen delay time relay (R ₁ ) and a relay (R ₂ ) are provided in parallel with the preheated oxygen solenoid valve (G). The gas saving circuit device according to claim 2, wherein the relay (R ₂ ) and the automatic and manual switches are connected in series. _2. The B contact of the preheated LP gas solenoid valve H and the gas time limit relay T ₂ is configured in series and the gas time limit relay T ₂ is connected in parallel with them. Gas saving circuit device when using torch. 5. The gas saving circuit device according to claim 4, wherein a semi-automatic selection switch is connected in parallel with the B contact of the gas time limit relay (T ₂ ).