JPH079558U - Gas cutting device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an unmanned automatic gas cutting device that can be used at night with good safety, workability, productivity and economy. A low voltage is applied between the gas cutting torch and the conductive material to be cut during the gas cutting operation, and the gas cutting torch and the conductive material to be cut are brought into contact with each other to form a conductive circuit. And a device for shutting off the cutting gas, and stopping the whole operation of the gas cutting device including the supply of the cutting gas unless the contact is broken and the conduction circuit disappears within a few seconds thereafter, and the gas cutting is always performed. Gas cutting device consisting of an igniter installed at the crater of a torch for ignition.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an unmanned automatic gas cutting device that can be used at night.

[0002]

[Prior art]

 In recent years, the gas cutting device has also become able to automatically perform the required gas cutting work unattended without having to divide the day and night by the NC control device. On the other hand, this type of unmanned automatic gas cutting operation deforms the material to be cut that has been developed on the surface plate of the cutting yard due to the heat of gas cutting during the progress of gas cutting, or the center of gravity of cutting products or chips generated by gas cutting. The change in the temperature may disrupt the support balance between the support members of the material to be cut that make up the surface plate, and may contact the crater of the gas cutting torch to cause misfire.

When this misfire occurs once, substantial cutting work is not executed even if the cutting gas is emitted, and the filling of unburned gas is postponed, causing an explosion accident. To prevent this, various sensors such as a cutting gas combustion flame detector and a gas leakage detector are used to detect the above-mentioned misfire and stop the cutting gas supply and stop the operation of the gas cutting device. Is going. However, not only are these detectors expensive, but there are also many erroneous detections due to changes in the detection field of view due to a narrow detection field of view and changes in the mounting part, and unmanned and automatic gas cutting work is required. The reality is that you cannot do this.

[0004]

[Problems to be solved by the device]

 The present invention eliminates the above-mentioned problems of the prior art, and also significantly improves the safety, workability, productivity, and economical efficiency of gas cutting work, and unmanned automatic gas cutting work is performed even at night. It is an object to provide a gas cutting device that can be used.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a method for detecting a contact between a gas cutting torch or a contact that is substantially equivalent to the gas cutting torch during a gas cutting operation, and a conductive cutting material. When a low voltage is applied to the gas cutting torch or the contact detection body and the conductive material to be cut to form a conductive circuit, the cutting gas cutoff system is set up, and the contact is made within a few seconds after that. If the circuit breaks down and the conduction circuit does not disappear, the cutting gas supply is stopped, and at the same time, a device to stop the operation of the gas cutting device and an ignition device that is always ignitable at the crater of the gas cutting torch are installed. The gas cutting device is

[0006]

[Action]

 According to the above-mentioned means used by the present invention, the contact between the material to be cut and the crater of the gas cutting torch that causes a misfire is detected by a small current, so there is no erroneous detection and the cutting gas is supplied immediately even if it is detected. Since it does not shut off, unattended automatic gas cutting work can be continued even if there is no misfire even if there is the above contact. Even if the material to be cut and the crater of the gas cutting torch come into contact with each other and cause misfire, the cutting gas is not shut off within the set several seconds and the cutting gas is continuously supplied to the specified cutting position. The ignition device that can be ignited is used to prompt re-ignition, thus ensuring the continuation of unmanned automatic gas cutting work. If the compensation is not established within the set few seconds, the cutting gas is immediately stopped, so gas leakage due to misfire and secondary disaster such as explosion due to it is prevented. From the above, unattended automatic gas cutting operation can be performed at night with high safety, workability, productivity and economy. Since expensive sensors and associated equipment are no longer required, equipment costs and maintenance costs can be significantly reduced, and high misfire detection capability and continuous work continuity have been combined to ensure unmatched practicality. The resulting effect is obtained.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a general gas cutting apparatus embodying the present invention, FIG. 2 is a plan view thereof, and FIG. 3 shows the apparatus of the present invention, which has a high misfire detection capability and the continuity of compensated work, which is consistent and unrivaled. It is an expanded view of a control circuit that brings practicality.

In the figure, 1 is a cutting yard installed below the gas cutting device G, 2 is a surface plate arranged in the cutting yard 1, and the surface plate is a large number of materials to be cut installed at predetermined intervals. It is composed of three supporting members 4. 5 is an X-axis traveling rail of gas cutting coordinates of the gas cutting device G, 6 is a pedestal and a foundation of the X-axis traveling rail 5, 7 is a Y-axis traveling rail of gas cutting coordinates of the gas cutting device G, and 8 is the above-mentioned X The Y-axis traveling rail 7 is a pedestal installed between the traveling drive device 9 and the driven traveling device 10 on the axial traveling rail 5. Reference numeral 11 is a Y-axis traveling device mounted on the Y-axis traveling rail 7, 12 is a gas control panel, 13 is a Y-axis traveling drive device, and 14 is an automatic lifting control device for the cutting torch 15. The Y-axis traveling device 11 is loaded with the gas control panel 12, the Y-axis traveling drive device 13, and the automatic lifting control device 14 for the cutting torch 15.

Reference numeral 16 is a pilot burner of the ignition device used in this example, which is provided adjacent to the crater of the cutting torch 15 and constantly supplies re-pointing flame to the crater, and 17 is a torch frame attached to the Y-axis traveling drive device 13. , 18 is a cable carrier device such as the gas control panel 12, the Y-axis traveling drive device 13, the automatic lifting control device 14 of the cutting torch 15, 19 is an electric control box, 20 is a hose for cutting gases and cooling water, etc. A hanger device (both not shown), 21 is an X-axis traveling wheel, and 22 is an operation panel of the gas cutting device G. The igniter 16 to be devised is not limited to the pilot burner described above, but an igniter using a piezoelectric element, an igniter using an ignition coil, or the like can be used, depending on operating conditions such as unmanned operation at night. Can be selected and used.

FIG. 3 shows that a low voltage is applied between the gas cutting torch 15 and the conductive material to be cut 3 during gas cutting, and the gas cutting torch 15 and the conductive material to be cut 3 come into contact with each other to form a conduction circuit. Once formed, the cutting gas cutoff system is arranged, and if the contact is released within a few seconds after that and the conduction circuit does not disappear, the cutting gas supply is stopped and the operation of the gas cutting device is stopped at the same time. FIG. 3 is a development view of a control circuit configured by the device.

In FIG. 3, reference numeral 23 is a total power source, 24 is a distribution breaker of the gas cutting device G, 25 is a transformer rectifier for a power source of a touch sensor used in the present invention, 26 is a conductive material to be cut 3 and a torch for cutting. A low voltage (12V is used in this example) applied between 15 and a timer 27 operated by a current flowing in a conductive circuit formed when the cutting torch 15 comes into contact with the conductive material 3 to be cut. A relay operated by a contact 26at which is closed by the operation of the timer 26 after a time set in the timer 26, 27b is a disconnecting switch provided in a power source for gas cutting work which is opened by the operation of the relay 27, and 28 is a self-switch of the relay 27. A holding contact, 29 is a terminal of a lead wire (not shown) detachably attached to the gas cutting torch 15, and 30 is detachably attached to the conductive material 3 to be cut. A lead wire (not shown) terminal, a touch sensor 31 composed of the gas cutting torch 15 and the conductive material 3 to be cut, YL an operation indicator of the relay 27, and 32 a reset switch.

The control circuit of the example of FIG. 3 configured as described above includes the touch sensor 31 when the gas cutting torch 15 or a contact detection body (not shown) provided accompanying the gas cutting torch 15 comes into contact with the conductive material 3 to be cut. Forms a conduction circuit and starts the timer 26, and the cutting work condition is maintained for a predetermined time set in the timer 26. If the contact is continued even after the predetermined time has passed, the contact 26at is closed to operate the relay 27, open the disconnector 27b to cut off the power for gas cutting work, cut off the supply of the cutting gas, and move the X-axis, Y-axis, and lift the gas cutting torch. Stop execution of all gas cutting conditions. On the other hand, when the contact between the gas cutting torch 15 and the conductive material to be cut 3 is released and the conduction circuit of the touch sensor 31 disappears during the predetermined time set in the timer 26, that is, the contact 26at is not activated, the relay 27 Since the self-holding contact 28 of is not closed, the gas cutting work is continued. At this time, even if the crater of the gas cutting torch 15 is misfired due to the contact of the conductive material to be cut 3, the igniter 16 reignites the crater of the gas cutting torch 15, so the gas cutting work is continued. There is no hindrance. The above-mentioned control circuit peculiar to the present invention is not limited to the example shown in FIG. 3, and any control circuit capable of producing the required control function can be used in the implementation of the present invention without any trouble.

[0013]

[Effect of device]

 Since the present invention utilizes the above effects by using the above means, the safety, workability, productivity, and economic efficiency of the gas cutting work are significantly improved, and the unmanned automatic gas cutting work according to the present invention is performed at night. Since it can be implemented, it will have a large effect on this kind of field and a large ripple effect on related fields.

[Brief description of drawings]

FIG. 1 is a front view of a general gas cutting device embodying the present invention.

FIG. 2 is a plan view of a general gas cutting device embodying the present invention.

FIG. 3 is a control circuit diagram of the low-voltage loading device and the cutting gas blocking device used in the embodiment.

[Explanation of symbols]

G: Gas cutting device 24: Distribution breaker of gas cutting device G 25: Transformer rectifier for power supply of unmanned automatic control circuit 26: Timer 26at: Contact of timer 27: Relay 27b: Disconnector of relay 28: Self-holding contact of relay 29・ 30: Lead wire terminal 31: Touch sensor composed of gas cutting torch and conductive cut material

Claims (1)

[Scope of utility model registration request] 1. A low voltage is applied between a conductive material to be cut and a gas cutting torch or a contact detection body that detects contact substantially equivalently to the gas cutting torch during a gas cutting operation. When the gas cutting torch or the contact detector and the conductive material to be cut form contact with each other to form a conductive circuit, a cutting gas cutoff system is prepared, and within a few seconds after that, the contact is broken and the conductive circuit must disappear. For example, a device that stops the supply of the cutting gas and also stops the operation of the gas cutting device, and a gas cutting device that is provided with an ignition device that is always ignitable at the crater of the gas cutting torch.