JP2722454B2 - Portable plasma arc cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a portable plasma arc cutting apparatus for cutting a workpiece by a plasma arc. <Prior Art> Generally, in a plasma arc cutting operation, an arc discharge is generated between a workpiece or a nozzle and an electrode, and cutting is performed by a plasma jet in which an appropriate working gas is injected from the nozzle. Therefore, as the working gas, compressed air is frequently used because it is easily available and inexpensive. Conventionally, as shown in FIG. 5, a commercially available small air compressor 40 having an air tank 41 and a plasma arc cutting power supply 20 are connected to a plasma arc cutting torch 7 via a flexible hose 6. . <Problems to be Solved by the Invention> However, since the length of the flexible hose 6 is usually about 10 to 15 m, when the cutting work area is wide, the cutting power supply 20 and the small compressor are required. Workability was poor because 40 had to be moved separately. Of course, when working at heights, the handling of the small air compressor 40 and the cutting power supply 20 with poor portability is extremely troublesome, and the small air compressor 40 or the cutting power supply 20 that is moved up and down separately is dropped. As a result, there is a fear that not only the device is damaged but also a personal injury is caused. <Means for Solving the Problems> The configuration of the present invention is a portable plasma arc cutting apparatus that uses compressed air at the time of cutting. A ventilating through-hole communicating with the frame is formed, and the partition is vertically communicated with the partition on the front wall side, and an air compressor housed in the lower partition of the frame And a power supply for plasma arc cutting and various electrical components housed in the upper partition of the frame,
A cooling fan attached to one of the ventilation holes in the rear wall portion, and the cooling fan draws in outside air from the ventilation holes in the rear wall portion of the frame to ventilate the air in the frame. The air is exhausted from the other ventilation hole of the rear wall. <Operation> The cooling fan draws in outside air from the ventilation holes on the rear wall of the frame, and vents the air inside the frame while exhausting it from the other ventilation holes on the rear wall of the frame. Even if other devices are arranged on both outer sides and above the portable frame, the plasma arc cutting power supply and the air compressor housed in the frame can be forcibly cooled. That is, even if other devices are arranged on both outer sides and above the portable frame, the air around the plasma arc cutting power supply and the air compressor housed in the portable frame is ventilated by the cooling fan. Since the cutting power supply and the air compressor are cooled while heating, the cutting power supply and the air compressor can be prevented from being overheated. In particular, the air compressor can be downsized by forced cooling. Further, since the air around the air compressor is ventilated, the intake air of the air compressor disposed in the narrow space can be stabilized. Furthermore, since the heavy air compressor is housed in the lower part of the portable frame, the center of gravity becomes low and the frame can be stabilized during use. Furthermore, in combination with the mounting position of the heavy air compressor at the lower part, the frame body is relatively narrow and relatively long, so that it is possible to carry the air compressor in a well-balanced manner using the handle. Of course, since the power source for plasma arc cutting and the air compressor are housed in the portable frame, it is extremely portable and suitable for a wide range of cutting work. <Example> Hereinafter, the present invention will be described in detail with reference to an illustrated example. In FIGS. 1 to 3, reference numeral 1 denotes a portable frame having a lid 101 having an appropriate shape which can be opened and closed, and is formed, for example, by dividing it into two stages. A power supply for cutting a plasma arc is housed inside the frame 1, and a transformer 2, which is a main part of the power supply for cutting a plasma arc, is illustrated. That is, it is supported by the upper partition. Reference numeral 3 denotes a main part of various electric components for electric control, which is supported by the upper partition of the frame 1. Reference numeral 4 denotes an appropriately small-sized air compressor such as a diaphragm type or a piston type, which is supported by applying a suitable vibration isolating means to a lower portion of the frame 1, that is, a lower partition portion. Reference numeral 5 denotes a cooling fan attached to the rear wall of the frame 1, and reference numeral 6 denotes a flexible cable, which connects the output side of the plasma arc cutting power supply and the compressed air path to the plasma arc cutting torch 7. When the lid 101 is attached to the frame 1, a hole 102 is formed in the front wall of the frame 1 so that the upper and lower partitions communicate with each other up and down. Ventilation through holes 103, 103 through which the compartments communicate with the outside are provided. Of course, in order to protect the inside, the ventilation hole 103 is provided with a lattice-shaped or wire-meshed air-permeable member 104. In the above configuration, by operating the cutting torch 7, the transformer 2 is energized and the air compressor 4 is driven, so that the plasma arc cutting is performed using the compressed air. At the same time, or around the same time, the cooling fan 5 is rotated, and outside air flows into the frame 1. The outside air flowing into the frame 1 flows around the air compressor 4, passes through the hole 102 and the transformer 2, and is discharged outside through the ventilation hole 103 on the upper side of the rear wall. In this manner, the cooling fan 5 draws in outside air from the rear wall of the frame 1, and ventilates the air in the frame 1 while passing through the other of the rear wall of the frame 1, that is, from the upper ventilation hole 103. Since the air is exhausted, the devices inside the frame can be forcibly cooled even if other devices are arranged on both outer sides and above the portable frame. Of course, since the forced air cooling is performed, the transformer 2 and the air compressor 4 are not overheated. In particular, the size of the air compressor 4 can be reduced by forced cooling. Further, since the air around the air compressor 4 is ventilated, it is possible to stabilize the intake air of the air compressor 4 arranged in the narrow space, that is, to stabilize the generation of air compression. Of course, it is preferable to turn on / off the cooling fan 5 by turning on / off the main power supply of the plasma arc cutting apparatus, since the cooling is always performed when the cutting operation is possible. At the time of carrying, as shown in FIG. 3, the plasma arc cutting device can be integrally moved by winding the flexible cable 6 and supporting it on the frame 1. FIG. 4 is a view showing another embodiment of the present invention, in which the vertical position of the cooling fan 5 and the exhaust hole in the ventilation hole 103 in FIG. 2 are reversed. In addition, if it arrange | positions as shown in FIG. 1 or FIG. 4, since the heavy air compressor 4 is accommodated in the lower part of the portable frame 1, it will have a low center of gravity, 1 can be stabilized. Further, in combination with the fact that the mounting position of the air compressor 4 which is of great significance is at the bottom, the frame 1 is narrow and relatively vertically long, so that the frame 1 can be transported in a well-balanced manner using the handle 105. . In addition, in order to facilitate conveyance, two or more handles for conveyance can be provided. Furthermore, at the time of plasma arc cutting, 2-3 kg / cm ² , 10
In many cases, compressed air of several minutes is used, so even if the discharge side of the small air compressor and the torch for plasma arc cutting are directly connected with a flexible cable, there is no substantial adverse effect on the actual cutting work, If an air tank is provided in the compressed air passage, a cutting result with higher precision can be obtained. Of course, a pressure reducing valve or a pressure regulator can be provided in the compressed air passage. <Effects of the Invention> As is apparent from the above description, in the device according to the present invention, the cooling fan draws in outside air from the ventilation holes in the rear wall of the frame, and ventilates the air inside the frame. In order to exhaust air from the other ventilation hole in the rear wall of the body, even if other equipment is placed on both sides and above the portable frame, the plasma arc cutting power supply and air housed inside the frame The compressor can be forcibly cooled. Of course, the cutting power supply and the air compressor are cooled in order to cool the cutting power supply and the air compressor while ventilating the air around the plasma arc cutting power supply and the air compressor stored in the portable frame body with a cooling fan. Can be avoided, and the size of the air compressor can be reduced particularly by forced cooling. Further, since the air around the air compressor is ventilated, the intake air of the air compressor disposed in the narrow space can be stabilized. Therefore, plasma arc cutting can be performed with a compact device. Furthermore, since the heavy air compressor is housed in the lower part of the portable frame, the center of gravity becomes low and the frame can be stabilized during use. Further, the plasma arc cutting power supply and the air compressor are housed in a portable frame body, and the mounting position of the heavy air compressor is located at the lower part, so that the frame body is narrow. Since the width is relatively long, it can be transported in a well-balanced manner using the handle, which makes it extremely portable and safe and quick cutting work without having to worry about handling equipment even in a wide range of cutting work. It can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view showing an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a perspective view of FIG. 1, and FIG. FIG. 3 is a view showing another embodiment of the present invention and is a view corresponding to FIG.
FIG. 5 is a diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Portable frame, 2 ... Main part of plasma arc cutting power supply, 3 ... Electric parts, 4 ... Air compressor, 5 ...
Cooling fan 102: communication hole 103 in the upper and lower compartments: ventilation hole

Claims (1)

(57) [Claims] In a portable plasma arc cutting apparatus using compressed air at the time of cutting, the upper wall is divided into upper and lower tiers, and a ventilation hole is formed in a rear wall portion communicating with each of the upper and lower division portions and the outside air, and a front wall is formed. A portable frame body in which the compartments are vertically communicated with each other on the side, an air compressor housed in a lower compartment of the frame body, and a plasma arc cutting housed in an upper compartment of the frame body Power supply and various electric parts, and a cooling fan attached to one of the ventilation holes in the rear wall portion,
The portable fan characterized in that the cooling fan draws in outside air from a ventilation hole in a rear wall of the frame, and exhausts air from the other ventilation hole in the rear wall while ventilating air in the frame. Plasma arc cutting equipment.