JP2007061858A - Flame stabilizer of gas cutting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate stabilization of flame from each cutting torch, in a gas cutting apparatus for cutting a workpiece by supplying cutting oxygen, fuel gas and preheating oxygen from a header tube to a plurality of cutting torches. <P>SOLUTION: A chamber 5 is installed between the branching port of the header tube and the hose of the cutting torch that is connected to the branching port. The chamber 5 is provided with a primary lateral pressure chamber 6 leading to the branching port and a secondary lateral pressure chamber 7 leading to the hose. Between the two chambers 6, 7, there is a partition wall 9 having an orifice 8. The pressure of the primary lateral pressure chamber 6 is maintained by the partition wall 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas cutting machine that moves a plurality of cutting torches along a material to be cut such as a steel plate and simultaneously cuts them, and relates to a gas cutting machine that can easily adjust the flame of the cutting torch to a stable state. It concerns flame stabilizers.

  Gas cutting machine that supplies fuel gas, preheated oxygen, and cutting oxygen to the header pipes, supplies the cutting torch through the hose from a plurality of branch ports provided in each header pipe, and cuts the material to be cut by the plurality of cutting torches However, the gas supplied to each header pipe diffuses as the internal pressure advances to the tip, and the pressure supply balance in the pipe is lost, so the flame of the cutting torch is positioned at the branch port formed in the header pipe. Due to this, it is easy to cause variations, and it is very troublesome to stabilize the flame to a neutral flame.

  The cutting oxygen, preheating oxygen, fuel gas (for example, LPG) pressure, flow rate, etc. used for the cutting torch are shown in FIG. 6 as an example, depending on the size of the crater and the thickness of the material to be cut. Since it is established, the flame should be stable if it is supplied to each cutting torch as it is, but its adjustment is not easy. More specifically, for example, as shown in FIG. 7, in a conventional cutting machine, a plurality of cutting torches (T1), (T2) and (T2) are connected by directly connecting hoses to a plurality of branch ports provided in the header pipe (H).・ ・ Because it is configured to supply gas, etc., when adjusting the flame, when all the valves (not shown) in each torch are first closed and gas with a predetermined adjustment pressure is supplied into the header pipe, At that time, the adjustment pressure in each hose can be maintained at the same pressure. When the valve of the first cutting torch (T1) is opened and ignited, the predetermined adjustment pressure is supplied as described above. Therefore, the valve is controlled to easily adjust the flame to a neutral flame. be able to. However, if the ignition is sequentially performed as No. 2 (T2), No. 3 (T3),..., The pressure of the gas supplied to No. 1 (T1) decreases, and each torch is thereafter fired in turn. Since the flame becomes a low flame, the flame is disturbed and must be readjusted. Thus, only the first cutting torch (T1) can adjust the valve so that the neutral flame can be correctly maintained based on the first adjusted pressure, and the other torch cannot.

It is known that a manual pressure regulator is provided in the secondary gas line branched from the header pipe to adjust the pressure of the gas supplied from the main line (see, for example, Patent Document 1). It must be adjusted to a small amount while looking at the pressure flow meter, which is substantially the same as the adjustment by the valve. It is also known to adjust using a control device such as a computer, but the device is complicated and cannot be obtained economically.
JP-A-9-225633 (0005, FIG. 2)

  The problem to be solved by the present invention is that it is possible to easily adjust the flame of a plurality of cutting torches, there is no need to manually adjust the pressure as in the prior art, no fine adjustment is required, the configuration is simple, and gas cutting that is economically obtained Is to provide a flame stabilizer for the machine.

  According to the present invention, fuel gas, preheated oxygen, and cutting oxygen are respectively supplied to the header pipe and supplied to the cutting torch through a plurality of branch ports provided in each header pipe, and the material to be cut is supplied by the plurality of cutting torches. In a gas cutting machine adapted to cut, a chamber connected to the branch port of the header pipe is formed, and a primary pressure chamber communicating with the branch port and a secondary pressure chamber communicating with the hose are formed in the chamber. And the flame stabilizer of the gas cutting machine characterized by providing the partition between this primary side pressure chamber and the secondary side pressure chamber, and having formed the orifice in this partition is provided, and the said subject is solved.

  The present invention is configured as described above. As shown in FIG. 1, a chamber (5) is provided between the branch port (2) of the header pipe (1) and the hose (4) of the cutting torch (3). A primary pressure chamber (6) communicating with the branch port (2) and a secondary pressure chamber (7) communicating with the hose (4) are formed in the chamber (5), and the primary pressure chamber (6) and two Since the partition wall (9) having the orifice (8) is provided between the secondary pressure chambers (7), the primary pressure chambers (6) connected to the plurality of branch ports are respectively supplied to the header pipes. The gas or oxygen having the same internal pressure as the generated pressure can be supplied, and this pressure can be maintained by the partition wall. And since only one cutting torch is connected to each chamber through one hose, even if the valve of one cutting torch is opened and the flame is adjusted, it is connected to the other branch port. The pressure in the primary pressure chamber of the other chamber remains maintained at the supply pressure. Therefore, since it does not affect other cutting torches, the flame of each cutting torch can be easily adjusted and the flame can be stabilized. In addition, as shown in the example of the specifications of FIG. 6, the flow rates of the cutting oxygen, preheated oxygen, and fuel gas are defined. By changing the opening area and opening position of the orifice of the partition wall according to each flow rate, It can be easily handled.

  FIG. 2 shows a block diagram of a gas cutting machine to which the present invention is applied, and a cutting oxygen supply line (10), a fuel gas supply line (11), and a preheating oxygen supply line (12) are each provided with a cutting oxygen pressure regulator. (13), cutting oxygen ON / OFF gauge (14), gas HI pressure regulator (15), gas LOW pressure regulator (16), preheating oxygen HI pressure regulator (17) and preheating oxygen LOW pressure regulator (18 ), And solenoid valves (19), (20), (21) are provided in the supply lines (10), (11), (12), and the gas cutter NC controller (22) controls the entire system. ing.

  A cutting oxygen header pipe (1a), a gas header pipe (1b) and a preheated oxygen header pipe (1c) are connected to the supply lines (10), (11), (12), and each header pipe (1a) is connected. The cutting oxygen hose (4a), the gas hose (4b), and the preheating oxygen hose (4c) communicated with the plurality of branch ports provided in (1b) and (1c) have a cutting blow tube (23) and a crater tip (24). Connected to the cutting torch (3), the cutting oxygen valve (25), the gas valve (26) and the preheating oxygen valve (27) are configured to control the flow rate to the torch. These structures and operations are almost the same as those of a known gas cutter.

  Thus, in the present invention, a chamber is provided between the branch port of the header pipe (1a), (1b), (1c) and the respective hoses (4a), (4b), (4c). 3 to 5 show the chambers (5a), (5b) and (5c) for cutting oxygen, fuel gas and preheated oxygen, each chamber having basically the same structure and leading to the branch port. A primary body (29) that forms a primary pressure chamber (6) having an inlet (28) and a secondary body that forms a secondary pressure chamber (7) having an outlet (30) leading to a hose ( 31), each main body (29), (31) is formed in a cylindrical shape, and is screw-engaged via a seal member (32).

  The inner diameters of the primary pressure chamber (6) and the secondary pressure chamber (7) are expanded from the inlet (28) and the outlet (30), respectively, and the volume of the primary pressure chamber (6) is increased to the secondary side. It is formed larger than the volume of the pressure chamber (7), a partition wall (9) is provided between the pressure chambers, and a filter (33) is provided in the primary pressure chamber (6). The partition wall (9) has an integral flange portion (34) at the periphery, and when the primary side main body (29) and the secondary side main body (31) are screw-engaged, the flange portion (34) and the filter (33) is sandwiched between the main bodies (29) and (31). An appropriate spacer (not shown) may be provided without forming the flange portion.

  An orifice (8) is formed in the partition wall (9). If the orifice (8) is too small, the flow rate for creating a neutral flame with respect to the specifications of the crater is insufficient, and if it is too large, the predetermined pressure cannot be maintained in the primary pressure chamber and the flame is unstable. Therefore, the opening area and the opening part that can obtain the optimal flow rate are selected according to the cutting oxygen, fuel gas, and preheated oxygen, and the vaporization state of gas and oxygen is different in summer and winter. Can be supplied.

  In the embodiment shown in FIG. 2, the crater NO. No. 0 to NO. The cutting oxygen orifice (8a) and the fuel gas orifice (8b) shown in FIG. 4 are formed at substantially the center of the partition wall (9) as shown in FIG. The above-mentioned orifice (8a) is formed in a size capable of supplying oxygen from the standard crater No. 0 to No. 5, and the fuel gas orifice (8b) is sized to supply a flow rate capable of generating a neutral flame or a strong flame. The opening area is smaller than the orifice (8a) for cutting oxygen. Further, as shown in FIG. 5, a plurality of preheated oxygen orifices (8c) are provided at the periphery of the partition wall so that the oxygen supply amount can be increased to raise the flame temperature.

  The test was repeated from December to July so that the above conditions were satisfied, the gas supply pressure was 0.06 MPa, the oxygen supply pressure was 0.75 MPa, and neutral flames were easily generated even with multiple cutting torches. According to the result of an experiment to be able to supply a flow rate that can be produced, the cutting oxygen orifice (8a) is a 2 mm diameter circular hole, and the fuel gas orifice (8b) is a 1.2 mm diameter circular hole for preheating oxygen. In the orifice (8c), three flames having a diameter of 1.2 mm were opened in the periphery at intervals of 120 degrees, and a neutral flame could be easily obtained.

  With the above configuration, the cutting oxygen, fuel gas, and preheated oxygen supplied from the header pipes (1a), (1b), (1c) to the hoses (4a), (4b), (4c) 5a), (5b), and (5c) are supplied to the primary pressure chamber (6) at a substantially uniform pressure, and maintained at a predetermined supply pressure by the partition wall (9). If the flame is adjusted by sequentially igniting from the first cutting torch in this state, a stable neutral flame can be easily obtained.

Explanatory drawing which shows the structure of this invention. The block diagram which shows one Example of this invention. The chamber for cutting oxygen is shown, (A) is a half-sectional view, (B) is explanatory drawing of an orifice. The chamber for fuel gas is shown, (A) is a half sectional view, (B) is explanatory drawing of an orifice. The chamber for preheating oxygen is shown, (A) is a half sectional view, (B) is explanatory drawing of an orifice. The chart which shows an example of specifications, such as the flow of cutting oxygen of a gas cutting machine, fuel gas, and preheating oxygen. Explanatory drawing which shows the relationship between a header pipe | tube and several cutting torches.

Explanation of symbols

1 Header pipe 3 Cutting torch 5 Chamber 6 Primary pressure chamber 7 Secondary pressure chamber 8 Orifice 9 Bulkhead 28 Inlet 29 Primary side main body 30 Outlet 31 Secondary side main body

Claims (4)

  Gas that supplies fuel gas, preheated oxygen, and cutting oxygen to the header pipes and supplies them to the cutting torch through a plurality of branch ports provided in each header pipe and cuts the material to be cut by the plurality of cutting torches. The cutting machine has a chamber connected to the branch port of the header pipe, and forms a primary side pressure chamber leading to the branch port and a secondary pressure chamber leading to the hose in the chamber, and the primary side pressure chamber A flame stabilizer for a gas cutting machine, wherein a partition is provided between the chamber and the secondary pressure chamber, and an orifice is formed in the partition.   The flame stabilizer for a gas cutter according to claim 1, wherein a filter is provided in the primary pressure chamber.   The flame of the gas cutting machine according to claim 1 or 2, wherein the orifice of the partition wall is formed so that the opening area of the orifice of the chamber through which the fuel gas passes is smaller than the opening area of the orifice of the chamber through which cutting oxygen passes. stabilizer.   2. The orifices of the chamber through which the cutting oxygen passes and the chamber through which fuel gas passes are opened at the center of the partition wall, and the orifices of the chamber through which the preheated oxygen passes are opened at the periphery of the partition wall. The flame stabilizer of the gas cutting machine in any one of thru | or 3.

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