Gas cutting device

Abstract

Even in environments where large amounts of dust and fumes are generated, the gas cutting device can be freely moved in any direction on the horizontal plane. [Solution] The present invention is a gas cutting device 100 that is remotely operated by a wireless remote control. The gas cutting device 100 comprises a pair of longitudinal tracks 2, 2 provided on the left and right sides of a processing space 1, a traveling frame 3 that spans the processing space 1 and is stretched between the pair of longitudinal tracks 2, 2 and travels back and forth, a lateral rail 4 mounted on the traveling frame 3 and extending to the left and right, a lateral trolley 5 that travels on the lateral rail 4, and a gas hose 7 that supplies oxygen and flammable gas to a cutting torch 6. The cutting torch 6 is fixed to the lateral trolley 5 so that its nozzle is facing downwards and protrudes from the front side of the traveling frame 3, and travels together with the lateral trolley 5. The traveling frame 3 has two pairs of longitudinal wheels 31 on the left and right that roll along the pair of longitudinal tracks 2, 2, respectively, and the longitudinal wheels 31 roll directly on the road surface of the longitudinal tracks 2, 2.

Description

Technical Field

[0005] ,

[0004] ,

[0001] The present invention relates to a device for semi-automatically performing gas cutting of iron materials and the like, and more particularly to a gas cutting device capable of running a cutting torch in an arbitrary direction on a horizontal plane by a wireless remote control.

Background Art

[0002] The inventors of the present invention are engaged in the work of gas cutting iron scraps in order to reuse the iron scraps discharged from a steel mill. Until now, they have run a cutting torch on a rail straddling a groove-shaped working pit in the left-right direction to perform cutting processing of iron scraps. The inventors of the present invention come up with the idea of running a gantry equipped with this left-right rail in the front-back direction to run the cutting torch in an arbitrary direction on a horizontal plane.

[0003] As described above, a technique of using rails extending in two mutually perpendicular directions on a horizontal plane and running a torch for gas cutting in an arbitrary direction on the horizontal plane is already known. For example, an NC type gas cutting device that runs a cutting torch back and forth and left and right by NC control to cut a steel plate or the like is widely known (see Patent Document 1 and Patent Document 2).

[0004] For example, in Patent Document 1, two sets of rails extending in the X-axis direction are provided, a marking device is run along one set of the rails, a gas cutting machine is run along the other set of the rails, and a base on which the two sets of rails are placed is run along a rail in the Y-axis direction, thereby disclosing a steel material processing device capable of freely running the marking device and the gas cutting machine in an arbitrary direction on a horizontal plane.

[0005] Furthermore, Patent Document 2 discloses a gas cutting machine in which a gas cutting device and a reader are integrally mounted to be movable in the X direction along a connecting bar that spans both a processing table and a tracing table arranged side by side, and the connecting bar is made to run along a pair of rails in the Y direction that are provided on the left and right sides so as to sandwich the processing table and the tracing table, thereby allowing the gas cutting device and reader to move freely in all directions.In the gas cutting machine of Patent Document 1, the gas cutting torch on the processing table is configured to move according to the diagram on the tracing table by having the reader trace the diagram on the tracing table. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 08-025087 [Patent Document 2] Japanese Patent Application Publication No. 10-263808 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, the iron scrap that the inventors cut is large in volume, and the large amount of dust and fumes generated by the cutting process scatters into the surrounding area. Therefore, in gas cutting devices like those described in Patent Documents 1 and 2, where the wheels and rails engage precisely, there is a problem that dust and other particles accumulating on the rails hinder the movement of the frame. This invention has been made in view of the above problems, and aims to provide a gas cutting device that can travel freely in any direction on a horizontal plane, even in environments where large amounts of dust and fumes are generated. [Means for solving the problem]

[0008] The invention made to solve the above problems is a gas cutting device for remotely controlling the movement of a cutting torch by a wireless remote control, comprising: a processing space for placing the material to be cut; a pair of longitudinal tracks provided on the left and right sides of the processing space, each consisting of a horizontal road surface extending in the front-rear direction perpendicular to the left-right direction; a traveling frame that spans the processing space from left to right and is stretched between the pair of longitudinal tracks and travels in the front-rear direction; a lateral rail provided on the traveling frame and extending in the left-right direction; a lateral trolley that travels along the lateral rail; and a gas hose for supplying oxygen and flammable gas to the cutting torch, wherein the cutting torch is fixed to the lateral trolley and has a nozzle protruding downward from the front side of the traveling frame and is configured to travel together with the lateral trolley, and the traveling frame has two pairs of longitudinal wheels on the left and right that roll along the pair of longitudinal tracks, and the longitudinal wheels roll directly on the road surface of the longitudinal tracks. From this point forward, the "front-back direction" may also be referred to as "vertical," and the "left-right direction" may also be referred to as "horizontal."

[0009] In this gas cutting device, the longitudinal wheels are designed to roll directly on the surface of the longitudinal path without the need for rails or the like. Therefore, even if fumes and dust from gas cutting accumulate on the longitudinal path and the longitudinal wheels ride up on the dust, the longitudinal wheels will not derail. Furthermore, since there are no rails on the longitudinal path, it is easy to clean the dust that accumulates on the path, and workers can walk on it safely.

[0010] The gas cutting device of the present invention is preferably provided with a suspension rod for suspending the gas hose, which is mounted on the travel frame so as to extend in the left-right direction at a position higher than the horizontal rail. The gas cutting device of the present invention can also be used when working with the upper part of the processing space open by a building that moves in the front-rear direction to avoid health damage to workers from dust, etc. In this case, the gas hose cannot be supported by the beams of the building, etc. By providing such a suspension rod on the travel frame, the gas hose can be suspended from the suspension rod even when the building is moved to the rear to open the upper part of the gas cutting device. Furthermore, the suspension rod can also be used to suspend the electrical cables of the horizontal trolley or camera.

[0011] Preferably, the gas hose consists of a supply-side hose that is on the gas supply side of the connector fixed to the horizontal trolley, and a torch-side hose that connects the connector to the cutting torch. The supply-side hose is fixed to the suspension rod at an intermediate position in the longitudinal direction, and is suspended by a suspension wire that is swingably suspended from the suspension rod at a suspension position located towards the tip of the intermediate position, so that the swinging part consisting of the hose at the tip of the intermediate position swings in accordance with the horizontal movement of the horizontal trolley. This allows the tip of the supply-side hose to move in accordance with the movement of the horizontal trolley, thereby preventing the gas hose from obstructing the movement of the horizontal trolley.

[0012] The gas cutting device according to the present invention preferably includes an igniter for igniting the cutting torch, the igniter having a cylindrical section consisting of a vertical section that extends vertically and is fixed to the travel frame so as to be rotatable around an axis and slidable up and down at a position on the longitudinal track, and an arm section that extends laterally from the lower end of the vertical section, a spark generating electrode provided at the tip of the arm section and located near the nozzle of the cutting torch when the cutting torch moves to the end of the horizontal rail, an electrical cable connected from the upper end of the cylindrical section through the cylindrical section to the spark generating electrode, and a handle provided in a branch shape at the upper end of the vertical section to adjust the position of the spark generating electrode by rotating or sliding the vertical section. In this way, by fixing the vertical section of the igniter to the travel frame so as to be rotatable around an axis on the longitudinal track, the spark generating electrode can be rotated toward the longitudinal track and maintained on the longitudinal track. Furthermore, by making the vertical part of the ignition device rotatable and slidable up and down, the position of the spark-generating electrode can be adjusted to match the position of the cutting torch nozzle, even if the position of the nozzle changes to suit the material being cut. Here, "near the torch" refers to the area that is close enough to the spark-generating electrode to ignite the cutting torch.

[0013] Preferably, the gas cutting device of the present invention is fixed to the horizontally moving carriage and includes a camera that photographs at least the tip of the nozzle of the cutting torch, at least a portion of the flame extending from the nozzle, and the cutting location of the material to be cut, and a monitor that displays the image taken by the camera and is installed in front of the traveling frame, so that the cutting of the material by the cutting torch can be visually observed via the monitor. This allows the cutting of the material by the flame of the cutting torch to be confirmed on the monitor, and the position and direction of travel of the cutting torch can be visually confirmed, so the cutting device can be easily operated remotely.

[0014] Preferably, the lens of the aforementioned camera is fitted with cobalt glass. This partially blocks the light from the cutting torch, reducing eye damage to the person viewing the monitor, and also makes the flame displayed on the monitor blue, allowing the flame from the cutting torch and surrounding materials to be easily seen on the monitor.

[0015] The gas cutting device of the present invention preferably has a number of through-holes provided between the pair of horizontal rails, and at least a portion of the through-holes is displayed on the monitor. The monitor screen showing the gas cutting process is difficult to see due to the brightness of the flame, but by including the number of through-holes provided between the horizontal rails on the monitor screen, the flame from the cutting torch below the horizontal rails illuminates the through-hole portion between the horizontal rails, and the parts other than the through-holes become silhouettes, making it easy to see on the monitor that the horizontal trolley is running on the horizontal rails.

[0016] Preferably, at least a portion of the side walls and / or top walls of the aforementioned travel frame is made of mesh material. This prevents deformation of the travel frame due to radiant heat from the flame of the cutting torch. [Effects of the Invention]

[0017] As described above, according to the gas cutting device of the present invention, even in an environment where a large amount of fumes and dust scatter, the cutting device can travel freely in the front, rear, left, and right directions.

Brief Description of the Drawings

[0018] [Figure 1] It is a general perspective view of the gas cutting device according to one embodiment of the present invention as viewed from the front. [Figure 2] It is a partial perspective view showing the periphery of the cutting torch in the gas cutting device shown in FIG. 1. <00…083>[[ID=…]]It is a plan view showing the gas cutting device shown in FIG. 1 with a part omitted. [Figure 4] It is a front view of the gas cutting device shown in FIG. 3. [Figure 5] It is a right side view of the gas cutting device shown in FIG. 3. [Figure 6] It is an image of the periphery of the tip of the cutting torch taken by the camera of the gas cutting device shown in FIG. 1 and displayed on the monitor.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. However, the present invention is not limited to the following embodiments, and appropriate changes can be made without departing from the gist of the present invention.

[0020] Figure 1 shows a gas cutting device 100 according to one embodiment of the present invention. The gas cutting device 100 is used to cut iron materials such as iron scrap (the "cutting material" in the claims) A by setting them in a processing space 1 which consists of a groove-shaped pit that extends in the front-to-back direction (the depth direction of the paper in Figure 1) and opens upward. The gas cutting device 100 mainly comprises the processing space 1, vertical tracks 2, 2 provided on both the left and right sides (left and right in Figure 1) of the processing space 1, a traveling frame 3 that spans the processing space 1 and is stretched between the pair of vertical tracks 2, 2, a pair of horizontal rails 4, 4 provided on the traveling frame 3 and extending in the left-to-right direction, a horizontal trolley 5 that travels on the horizontal rails 4, 4, a cutting torch 6 for performing gas cutting, a gas hose 7 that supplies oxygen and flammable gas to the cutting torch 6, and an igniter 8 that ignites the cutting torch 6. The processing space 1 and the pair of longitudinal pathways 2,2 can be covered from above at appropriate locations in the front-to-back direction by a building B that is movable in the front-to-back direction, and can also be opened up.

[0021] As shown in Figures 1 and 2, the processing space 1 consists of a groove-shaped pit with a rectangular cross-section perpendicular to the longitudinal direction. A workbench 10 for placing cutting materials such as iron may be installed in the processing space 1, as shown in Figure 1, or the workbench 10 may be removed by a crane or the like, as shown in Figure 2, and the iron material A to be cut may be placed at the bottom of the groove-shaped pit that constitutes the processing space 1. In the example in Figure 1, the workbench 10 is made of steel plates formed in a grid pattern.

[0022] The vertical pathway 2 consists of a concrete horizontal surface that is one level higher than the processing space 1 and extends in the front-to-back direction. There are two vertical pathways 2, one on each side of the processing space 1, for a total of two pathways. However, the vertical pathway 2 is not limited to concrete; for example, it may be made of steel plates. On the left and right outer sides of the vertical pathway 2, there is a pair of side walls 21, 21 that extend in the front-to-back direction along the vertical pathway 2.

[0023] As shown in Figures 3 to 5, the travel frame 3 is formed in a gate shape when viewed from the front, comprising a frame body 32 that is a rectangular box shape long in the left-right direction (left-right direction in Figures 3 and 4), and longitudinal wheels 31 that extend downward from both ends of the frame body 32. The frame body 32 has an open bottom and most of the other five sides are made of mesh members 32c made of so-called expanded metal or perforated metal, etc., to suppress thermal deformation caused by the cutting torch 6.

[0024] The longitudinal wheels 31 consist of four wheels in total, two on each side (front and rear), and roll along the longitudinal track 2 in the front-rear direction by axles 31b with their axial direction in the left-right direction, supported by forks 31a, 31a made of a pair of plate material hanging down from the lower surface of the frame body 32. Preferably, the longitudinal wheels 31 are made of steel. By using steel wheels for the longitudinal wheels 31, the frame can be driven while crushing dust, fumes, etc. with the longitudinal wheels 31.

[0025] As shown in Figure 3, a gear motor 33 is mounted on the upper right end of the frame body 32, and a shaft 34 extending horizontally is provided inside the frame body 32. The longitudinal wheels 31,31 on the right side (left side in Figures 3 and 4) are rotated by the gear motor 33 via sprockets 35,... and chain 36. The longitudinal wheels 31,31 on the left side in Figure 3 are rotated by the gear motor 33 via shaft 34, sprocket 35 and chain 36, and the travel frame 3 is configured as a so-called four-wheel drive system. The sprockets 35 and chain 36 that drive the longitudinal wheels 31 are housed in chain boxes 371 and 372.

[0026] Here, it is important that the vertical wheels 31 roll directly on the surface of the vertical track 2. By having the vertical wheels 31 roll directly on the vertical track 2 without using rails, the vertical wheels can easily overcome dust, fumes, spatter, etc. scattered on the vertical track 2. Also, since there are no rails on the vertical track 2, it is easy to clean up dust and other debris scattered on the surface of the vertical track 2. The vertical track 2 serves as a passage for workers when transporting steel materials A by crane, etc., so the absence of rails ensures the safety of the workers' feet.

[0027] The travel platform 3 is designed so that even if it travels diagonally due to some trouble, the longitudinal wheels 31 will not derail into the processing space 1 by colliding with the side wall 21.

[0028] Furthermore, as shown in Figure 1, the travel frame 3 has suspension rods 39 made of round metal bars stretched approximately horizontally between support columns 38, 38 erected at the left and right rear corners. Power is supplied to the travel frame 3 from the outdoor control panel 91.

[0029] As shown in Figure 3, the horizontal rail 4 consists of a pair of grooves provided along both ends of a strip-shaped steel plate 41, which is placed on the running frame 3 with its longitudinal direction oriented left to right, in the width direction (up and down direction in Figure 3). The steel plate 41 has numerous circular holes (through holes) 41a,... provided between the pair of horizontal rails 4,4 to prevent thermal deformation caused by the cutting torch.

[0030] As shown in Figure 4, the horizontal trolley 5 comprises a trolley body 51, a pair of drive wheels 521, 521, a pair of driven wheels 522, 522, a base pipe 53 erected on the upper surface of the trolley body 51, and a cable pole 54. The base pipe 53 is made of metal tubing, to which a support branch 11 is fixed, and a connector 55 for relaying a gas hose 7 is mounted at its upper end. An electrical cable 56 that supplies power to the horizontal trolley 5 and a camera 9 are fixed to the cable pole 54. However, the camera 9 can also be fixed in another location.

[0031] The cutting torch 6 is fixed to the horizontal trolley 5 and moves together with the horizontal trolley 5. In detail, as shown in Figure 2, the cutting torch 6 is fixed to the horizontal trolley 5 via a support branch 11 and has a nozzle 6a protruding downwards from the front side of the running frame 3.

[0032] As shown in Figure 2, the support branch 11 has a horizontal cantilevered base beam 11b whose base end (right side in Figure 2) is fixedly supported to the base pipe 53 of the horizontal trolley 5, a vertical column 11d connected vertically to the tip of the base beam 11b, and a torch support rod 11f that is cantilevered to the lower end of the vertical column 11d and extends horizontally forward. The cutting torch 6 is fixed to this torch support rod 11f with a clamp.

[0033] The cutting torch 6 is configured such that when the manual cock (not shown) in the operating space 93 in front of the processing space 1 is opened, preheating oxygen, cutting oxygen, and fuel gas are supplied, and preheating and cutting flames are ejected from the nozzle 6a.

[0034] The gas hose 7 is formed by covering an oxygen hose 7a for supplying oxygen, a fuel gas hose 7b for supplying fuel gas such as acetylene or propane, and an electrical cable 7c for supplying power to the solenoid valve of the cutting torch 6 with a flame-retardant cover.

[0035] The gas hose 7 comprises a supply-side hose 71 located on the gas supply side of the connector 55 and a torch-side hose 72 located on the cutting torch side of the connector 55. This prevents the torch-side hose 72 from being deformed by the movement of the lateral-traveling trolley 5, thereby preventing the cutting torch 6 from being obstructed by the movement of the gas hose 7.

[0036] The supply hose 71 of the gas hose 7 is suspended at multiple points on the suspension rod 39 of the running frame 3 by annular fittings 39a, 39a, ... The supply hose 71 is suspended by a suspension wire 39b that hangs from the suspension rod 39 at a suspension position 712 that is closer to the tip than the intermediate position 711 where the annular fitting 39a closest to the connector 55 is located, and the swinging part 713, which consists of the hose from the tip position 711 onwards, is configured to swing in accordance with the lateral movement of the lateral trolley 5. The swinging part 713 has a considerable length so that the lateral trolley 5 follows the lateral trolley 5 along the entire length of the lateral rail 4, and if the intermediate position 711 is used as the pivot point, the gas hose 7 constituting the swinging part 713 rests on the upper surface of the running frame 3, making it difficult to swing. In this way, by suspending the swinging part 713 of the supply hose 71 with the suspension wire 39b, it is possible to prevent the swinging part 713 from resting on the upper surface of the travel frame 3, thereby allowing the swinging part 713 to swing more freely.

[0037] As shown in Figure 1, the igniter 8 comprises an L-shaped cylindrical section 81, a spark-generating electrode 82 provided at the lower end of the cylindrical section 81, an electrical cable 83 that supplies power to the spark-generating electrode 82, and a handle 84 for rotating or sliding the cylindrical section 81. It is supported by a pivot member 85 on the left end of the front side of the travel frame 3 so as to be rotatable horizontally and slidable vertically. The cylindrical section 81 has a vertical section 81a that extends vertically and is fixed to the travel frame 3 so as to be rotatable around an axis, and an arm section 81b that extends laterally from the lower end of the vertical section 81a. The spark-generating electrode 82 is provided at the tip of this arm section 81b and is configured to be located near the nozzle 6a of the cutting torch 6 when the cutting torch 6 moves to the end of the horizontal rail 4. The handle 84 is provided in a branch-like manner at the upper end of the vertical section 81a, and the position of the spark-generating electrode 82 can be adjusted by rotating or sliding the vertical section 81a using the handle 84. The electrical cable 83 is connected to the spark-generating electrode 82 through the cylindrical section 81.

[0038] As shown in Figure 1, camera 9 is fixed to the cable pole 54 of the horizontal trolley 5 to capture video of the area around the nozzle 6a of the cutting torch 6 from diagonally above and behind it (towards the back of the page in Figure 1). The video captured by camera 9 is displayed via wireless communication on a monitor 94 installed in the operating space 93, which is located outdoors in front of the processing space 1. The lens of camera 9 is fitted with a cobalt lens to suppress red light, making the monitor screen easier to see and reducing eye strain for the operator. The operating space 93 is a horizontal plane at the same height as the vertical pathways 2,2 that connect the left and right vertical pathways 2,2 at the front edge of the processing space 1, allowing the gas cutting device 100 to be directly viewed from the front from the operating space 93. The lens of camera 9 is fitted with cobalt glass (cobalt filter), which reduces the brightness of the flame C on the monitor 94 screen, making the monitor screen easier to see and reducing eye strain for the operator.

[0039] As shown in Figure 6, the monitor 94 displays the area around where the cutting torch 6 is cutting the iron material A. More specifically, the monitor 94 displays at least a portion of the cutting torch 6, including the nozzle 6a, the flame C ejected from the nozzle 6a, the end portion A1 of the iron material A being cut by the flame C, the through holes 4a, 4a, ... between the horizontal rails 4, 4, and at least a portion of the horizontal trolley 5. When the cutting torch 6 is ignited, the tip of the igniter 8 is displayed. When the through holes 4a are displayed on the monitor screen, the light from the flame below the through holes 4a makes the through holes 4a appear bright, while the rest of the area appears dark, allowing the movement of the horizontal trolley 5 to be observed.

[0040] (Cutting procedure) Next, the procedure for gas cutting iron material A using the gas cutting device 100 will be explained. When cutting iron material A, such as iron scrap, using the gas cutting device 100 of the present invention, as shown in Figure 1, first the iron material A is placed in the processing space 1 using a crane or the like. If a workbench 10 is required, it is set up in advance using a crane or the like.

[0041] Once the iron material A is in place, the cutting torch 6 is ignited. When igniting, first, the horizontal trolley 5 is moved to the side where the igniter 8 is fixed using the wireless button control panel 92 from the operating space 93 on the front side of the processing space 1. While checking the area around the nozzle 6a of the cutting torch 6 using the monitor 94 in the operating space, the manual cock is operated to supply a preheating mixed gas to the nozzle 6a of the cutting torch 6. In this state, the igniter 8 is operated using the wireless button control panel 92 to ignite the nozzle 6a. With the gas cutting device 100, ignition can be performed at a distance from the igniter using the wireless button-operated control panel 92, thus reducing the risk of burns to the worker.

[0042] When the spark-generating electrode 82 of the igniter 8 is far from the nozzle 6a of the cutting torch 6, the position of the spark-generating electrode 82 is adjusted by operating the handle 84 of the igniter 8. Since the igniter 8 is fixed to the end of the travel frame 3, the igniter 8 can be operated from the vertical path 2 where the worker can walk.

[0043] After igniting the cutting torch 6, the mobile platform 3 and the horizontal trolley 5 are operated using the wireless button control panel 92 to direct the flame of the cutting torch 6 to the starting position of cutting at the end of the steel material A, thereby preheating the steel material A. Once preheating is complete, the cutting oxygen valve is sprayed by operating the manual cock, and the mobile platform 3 and the horizontal trolley 5 are operated using the wireless button control panel 92 to move the cutting torch 6 in the appropriate direction to cut the steel material A.

[0044] Once the cutting of steel material A is complete, operate the manual valve to stop the cutting oxygen, preheating oxygen, and fuel gas, and extinguish the cutting torch.

[0045] (Other embodiments) As described above, the gas cutting apparatus of the present invention is not limited to the embodiments described above. For example, the processing space may be at the same level as the road surface of the longitudinal road, or higher, rather than being a recess lower than the longitudinal road. A suspension rod for the gas hose is not required. The gas hose may be connected directly to the cutting torch without a connector, or it may not be suspended by a suspension wire. The igniter may not have a rotatable spark-generating electrode, may not be fixed to the travel frame, may be operated manually, or may not have an igniter at all. The longitudinal wheels may not be four, and all wheels may not be driven. A camera may not be provided, and the camera lens may not have a cobalt lens. The upper and side walls of the travel frame may not have mesh material. [Explanation of symbols]

[0046] Gas cutting device 100 Processing space 1 Ridge trail 2 Traveling platform 3 Longitudinal 31 Hanging rod 39 Suspension wire 39b Horizontal Rail 4 Horizontal trolley 5 Connector 55 Cutting Torch 6 Crater 6a Gas hose 7 Supply hose 71 Oscillating part 713 Torch-side hose 72 Lifting position 712 igniter 8 Circular tube part 81 Vertical section 81a Arm part 81b Spark generating electrode 82 Electrical cable 83 Handle 84 Camera 9 Lens 9a Wireless button-operated control panel (wireless remote control) 92 Monitor 94 Upper wall 32a side wall 32b Mesh member 32c

Claims

1. A gas cutting device in which the movement of the cutting torch is remotely controlled by a wireless remote control, A processing space for placing the material to be cut, A pair of longitudinal paths are provided on either side of the aforementioned processing space, and these paths consist of horizontal road surfaces that extend in the front-to-back direction perpendicular to the left-to-right direction, A travel platform is provided that spans the aforementioned processing space from left to right between the pair of longitudinal tracks and travels back and forth, A horizontal rail extending in the left-right direction is provided on the aforementioned running frame, A horizontally running bogie that runs along the aforementioned horizontal rail, A gas hose for supplying oxygen and flammable gas to the cutting torch, Equipped with, The cutting torch is fixed to the horizontal trolley and is mounted on the front side of the running frame with its nozzle facing downwards, and is configured to move together with the horizontal trolley. The gas cutting device is characterized in that the traveling frame has two pairs of longitudinal wheels on the left and right, each of which rolls along the pair of longitudinal tracks, and the longitudinal wheels roll directly along the road surface of the longitudinal tracks.

2. The gas cutting device according to claim 1, comprising a suspension rod for suspending the gas hose, which is provided on the running frame so as to extend in the left-right direction at a position higher than the aforementioned horizontal rail.

3. The gas hose consists of a supply-side hose that is on the gas supply side from the connector fixed to the horizontal trolley, and a torch-side hose that connects the connector to the cutting torch. The gas cutting device according to claim 2, wherein the supply hose is fixed to the suspension rod at an intermediate position in the longitudinal direction, and is suspended by a suspension wire that is swingably suspended from the suspension rod at a suspension position located toward the tip of the intermediate position, and the swinging part consisting of the hose toward the tip of the intermediate position swings in accordance with the lateral movement of the lateral trolley.

4. The cutting torch is equipped with an ignition device for igniting it. The aforementioned igniter is, A cylindrical section comprising a vertical section that extends vertically and is fixed to the travel frame at a position on the longitudinal path so as to be rotatable around an axis and slidable up and down, and an arm section that extends laterally from the lower end of the vertical section, A spark-generating electrode is provided at the tip of the arm portion and is located near the nozzle of the cutting torch when the cutting torch moves to the end of the horizontal rail, An electrical cable is connected from the upper end of the cylindrical section through the cylindrical section to the spark generating electrode, A handle is provided in a branch-like manner at the upper end of the vertical section and rotates or slides the vertical section to adjust the position of the spark-generating electrode. A gas cutting device according to claim 1 or claim 2, having the following:

5. A camera fixed to the aforementioned horizontal trolley is provided to photograph at least the tip of the cutting torch nozzle, at least a portion of the flame extending from the nozzle, and the cutting location of the material to be cut. A monitor is installed in front of the vehicle platform and displays the image captured by the aforementioned camera. It has, The gas cutting apparatus according to claim 1 or claim 2, wherein the cutting of the material to be cut by the cutting torch can be visually observed via the monitor and directly by eye.

6. The gas cutting apparatus according to claim 5, wherein the lens of the camera is fitted with cobalt glass.

7. It has numerous through holes provided between the pair of horizontal rails, The gas cutting apparatus according to claim 5, wherein at least a portion of the through-hole is displayed on the monitor.

8. The gas cutting device according to claim 1 or claim 2, wherein at least a portion of the side wall and / or upper wall of the traveling frame is made of a mesh member.

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