JP2002103032A - Stack gas apparatus in thermal cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely discharge gas when a material to be cut having a small width dimension is placed on a surface plate though an opening part is formed to an upper part of the surface plate in conducting thermal cutting of plasma cutting, laser beam cutting or gas cutting, etc. SOLUTION: A stack gas apparatus of a thermal cutting machine is constituted of a rail 1 laid in parallel, the surface plate C, which is constituted of arraying plural spanning plates in parallel in the direction orthogonal to a laying direction of the rail 1 and places the material to be cut B on its upper part, a cutting machine A, which has a frame 3 placed on the rail as freely running and mounts a cutting torch 2 to the frame 3 as freely traversing, a sucking member 12, which is arranged in a traversing direction of the cutting torch 2 mounted on the frame 3 of the cutting machine A and is opened toward a space between the spanning plates 5, and an injection nozzle 11, which is arranged to the suction member 12 as facing on interposing the cutting torch 2, is mounted to the carrier 8 arranged to be freely traversed to the frame 3 and injects a fluid to the space formed with the spanning plates 5 and the material B to be cut placed on the spanning plates 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoke exhaust device for exhausting smoke containing dust generated when a material to be cut placed on a surface plate is thermally cut. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoke exhaust device in a thermal cutting machine that can efficiently exhaust smoke even when the upper surface of a surface plate cannot be covered.

[0002]

2. Description of the Related Art When a material to be cut typified by a steel sheet is cut using a gas cutting torch, a plasma cutting torch, or a laser cutting torch, dust or smoke of iron oxide may be generated as the cutting proceeds. Are known. In particular, when plasma cutting is performed, the cutting speed is high and the amount of removed base material is large, so that more dust and smoke are generated than when other gas cutting or laser cutting is performed. For this reason, it is common to use a smoke exhaust device for removing generated dust and smoke in the plasma cutting device. However, even with a cutting device that performs another cutting method, it is preferable to use a smoke exhaust device in order to maintain a good work environment.

A case where a typical configuration of a smoke exhaust device is applied to a plasma cutting device will be described. As such a smoke exhaust device, as disclosed in Japanese Patent Publication No. 60-43231 (Patent No. 1315469) to which the present applicant has already acquired a patent, a rail is provided in the space below the plasma cutting machine body. Partition plates are arranged side by side so as to be perpendicular to each other to form a horizontal flue, and a suction hood and a spout hood are arranged at positions corresponding to the flue. It is known that a dust collector is provided in a duct. In this smoke exhaust device, hoods are arranged on both sides of a flue formed by placing a material to be cut on an upper portion of a partition plate, and the hood is generated as the material to be cut is cut off and enters the flue. Dust and smoke can be exhausted.

In the smoke exhaust device configured as described above, when the material to be cut is placed on the upper portion of the partition plate, the upper portions of the partition plates corresponding to both sides of the material to be cut are open depending on the size of the material to be cut. However, there is a problem in that the air cannot be efficiently exhausted by entraining the atmosphere from the open portion. For this reason, the present applicant has applied for a patent by developing the technology disclosed in Japanese Patent Application Laid-Open No. H8-318367 for the purpose of closing the opening.

In the above-mentioned technique, a flexible sheet is arranged along a rail, and when open portions are formed on both sides of a material to be cut placed on a partition plate, the sheet is pulled out and opened. By closing the part, the flue is secured by the pair of partition plates, the material to be cut, and the sheet. In this technique, a closed flue can be reliably formed and smoke can be stably exhausted regardless of the size of the partition plate and the material to be cut.

[0006]

However, the above-mentioned Japanese Patent Application Laid-Open No.
In the technique disclosed in Japanese Patent No. 318367, it is necessary to provide the seats along the rails, and there is a problem that the equipment becomes large.

[0007] Further, smoke including dust generated when cutting the material to be cut is not all discharged to the lower side of the material to be cut, but also exists around the cutting torch on the upper surface of the material to be cut. I do. In the above technique, there is a problem that dust or smoke around the cutting torch cannot be sucked and discharged.

SUMMARY OF THE INVENTION It is an object of the present invention to reliably discharge smoke even when an open portion is formed on an upper portion of a surface plate when a material to be cut is placed on the surface plate, and the periphery of a cutting torch is provided. It is an object of the present invention to provide a smoke exhaust device in a thermal cutting machine capable of exhausting smoke from an air conditioner.

[0009]

In order to solve the above-mentioned problems, a smoke exhaust device in a thermal cutting machine according to the present invention comprises a rail laid in a predetermined direction and a direction intersecting with the laying direction of the rail. A platen configured to have a plurality of insert plates arranged in parallel and having a material to be cut mounted on the insert plate, and a frame mounted so as to be able to travel on the rail so that the cutting torch can traverse the frame. A mounted thermal cutting machine, a suction member arranged in a transverse direction of a cutting torch mounted on a frame constituting the thermal cutting machine, and opened toward an insertion plate constituting a surface plate, and the cutting torch interposed therebetween. In the space formed by the insert plate that is arranged opposite to the opening of the suction member and that is attached to the carriage provided so as to be able to traverse on the frame and that constitutes the surface plate, and the material to be cut placed on the insert plate Injection nozzle that injects fluid It is those composed and a Le.

In the smoke exhaust device of the above-mentioned thermal cutting machine, a plurality of insert plates (partition plates in the prior art) are arranged in parallel in a direction intersecting with the rail laying direction to form a platen. When the material to be cut is placed on the upper part of the board, a flue can be formed by the adjacent insert plate and the material to be cut.

In particular, when the width of the material to be cut is smaller than the width of the surface plate, and the upper portion of the surface plate cannot be covered by the material to be cut, the carriage provided on the frame is traversed and the injection nozzle is moved. By moving to the vicinity of the intersection of the insert and the material to be cut, and in this state by ejecting a fluid typified by air with pressure from the injection nozzle, the space formed by the insert and the material to be cut Fluid can be supplied. Therefore, dust and smoke generated by the cutting can be sucked by the suction member together with the fluid jetted from the jetting member.

[0012] In the above smoke exhaust device, it is preferable to provide a hood for sucking smoke containing dust from the periphery of the cutting torch, corresponding to the tip of the cutting torch. in this case,
The hood provided corresponding to the tip of the cutting torch can suck the dust-containing smoke around the cutting torch.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the smoke exhaust device according to the present invention will be described below. In the wiring device according to the present invention, the width of the material to be cut placed on the insertion plate of the surface plate is smaller than the width of the surface plate (length of the insertion plate), and the width of the upper portion is increased along the length of the insertion plate. When it is not possible to form a covered flue, the jet nozzle that jets the fluid traverses along the frame to approach from the end of the insert plate to the end of the material to be cut in the width direction. By holding this position and injecting air with pressure from the injection nozzle, despite the dimensional difference between the insert plate and the material to be cut, it had a length equal to the width of the material to be cut It is configured so that a flue can be formed and smoke can be exhausted well.

In the thermal cutting of the material to be cut, the material to be cut is heated and heated to a melting or burning temperature, and a gas is injected to the material to be cut to remove the molten base material. And a method in which high-purity oxygen is injected and burned while excluding combustion products. Examples of such a cutting method include a plasma cutting method in which a very high-temperature plasma arc is sprayed on a material to be cut to melt the base material and remove the molten base material, and a laser beam is irradiated to the material to be cut. Laser cutting method for evaporating or melting the base material by gas, and gas cutting method for injecting a gas flame to the material to be cut and heating it and injecting oxygen gas to burn the base material and remove combustion products. is there. Then, it is possible to selectively perform each of the cutting methods.

As the fluid to be injected from the injection nozzle, it is possible to selectively use gas such as compressed air or nitrogen gas, or sprayed water, etc. For this purpose, it is preferable that the pressure be air (air).

Further, the injection nozzle is arranged to face the suction member with the cutting torch interposed therebetween. By arranging the ejection nozzles in this way, the suction member is arranged on one side of the flue formed by the insert plate and the material to be cut, and the ejection nozzle is arranged on the other side, and is discharged with cutting. The dust and smoke can be sucked by the suction member and discharged.

Therefore, by moving the frame along the rail and traversing the cutting torch along the frame in accordance with the direction of the cutting line with respect to the material to be cut, the desired shape can be cut, and the injection nozzle can be cut. Moves in the direction along the rails as the frame travels, so that smoke can be effectively exhausted.

By providing a hood for sucking smoke containing dust corresponding to the tip of the cutting torch, it is possible to suck dust and smoke around the cutting torch on the upper surface of the material to be cut. is there. This hood does not need to cover the entire cutting torch, but it is sufficient that the hood can cover a tip portion of the cutting torch, that is, a slightly upper portion than a portion of a nozzle for ejecting a plasma arc.

Next, a preferred embodiment of the smoke exhaust device will be described with reference to FIGS. FIG. 1 is a schematic plan view of a cutting machine equipped with the smoke exhaust device according to the present embodiment. FIG. 2 is a schematic front view of the cutting machine of FIG. FIG. 3 is a perspective view illustrating the configuration of the truck and the injection nozzle. FIG. 4 is a diagram for explaining the flow of fluid when exhausting smoke.

In the drawing, a pair of rails 1 are laid in parallel, and a cutting machine A having a cutting torch 2 mounted on the rails 1 so as to be able to traverse is arranged so as to be able to run, and is covered between the rails 1. A platen C on which the cutting material B is placed is provided. A smoke exhaust member D is mounted on the cutting machine A, and the smoke exhaust member D is configured to be able to exhaust smoke including dust generated when the workpiece B is cut.

The cutting machine A has a frame 3 mounted on the rail 1 and configured to be able to travel. This frame 3
Is composed of a saddle 3a arranged on the rail 1 and a cross garter 3b arranged in a direction orthogonal to the laying direction of the rail 1 and connected to the saddle 3a. The saddle 3a is provided with a traveling motor (not shown), and by driving the traveling motor, the frame 3
At a desired speed along the rail 1.

A traversing carriage 4 is arranged on the cross garter 3b so as to be traversable.
Is mounted with a cutting torch 2. The traversing carriage 4 is provided with a traversing motor (not shown). By driving the traversing motor, the cutting torch 2 can traverse at a desired speed.

Accordingly, by driving the traveling motor and the traversing motor at the speeds associated with each other, the cutting torch 2 travels in the direction along the rail 1 and in the direction along the cross garter 3b. It is possible to move the cutting torch 2 in the combined direction of each direction. That is, it is possible to cut the workpiece B by moving the cutting torch 2 linearly in any direction, or moving the cutting torch 2 linearly or curvedly in the combining direction.

As the cutting torch 2, one selected from a plasma cutting torch for performing a plasma cutting method, a laser cutting torch for performing a laser cutting method, and a gas cutting torch for performing a gas cutting method is used. In this embodiment, a plasma cutting torch is employed as the cutting torch 2.

The material to be cut B is a material that can be thermally cut. Examples of such a material include a ferrous metal such as a steel plate and a stainless steel plate, and a non-ferrous metal such as an aluminum plate and a copper plate. In particular, when configuring the cutting machine A, first, the metal to be cut (material B to be cut) is determined, and then a cutting method that can cut this metal most efficiently is determined. Is determined.

The platen C has a function of placing the material B to be cut, and has a plurality of insert plates 5 arranged in a direction (preferably orthogonal direction) intersecting with the laying direction of the rail 1.
And a bottom plate 6 provided over the entire surface of the surface plate C. Therefore, a groove-shaped space is formed on the surface plate C by the pair of adjacent insertion plates 5 and the bottom plate 6, and the material B to be cut is placed on the insertion plate 5 to cover the space, so that the flue 7
Can be formed.

The smoke discharge member D is for discharging smoke including dust generated in the flue 7 when the material B is cut. For this reason, the smoke exhaust member D is provided with an injection nozzle 11 on one side and a suction member 12 on the other side across the cutting torch 2.

The injection nozzle 11 is connected to a compressor or a blower (not shown) via a hose 15, and air having a pressure set so as to form the most effective flow is supplied from the injection nozzle 11. The suction member 12 is connected by a duct 14 with a dust collector 13 interposed.

The spray nozzle 11 injects fluid from the end opening side of the flue 7 covered by the material B to be cut into the flue 7 regardless of the width of the material B to be cut. Is attached to a trolley 8 provided so as to be able to traverse the cross garter 3b of the cutting machine A.
Cross garter 3b with the change of the width dimension of cut material B
, And can change the ejection position of the fluid.

The structure of the injection nozzle 11 is not particularly limited, and a structure in which a hole is directly formed in the wall surface of the pipe so that a fluid can be sprayed, or a structure in which a plurality of nozzle members are arranged in parallel. Etc. can be used.

In the present embodiment, a conduit 11a having a predetermined length (a length approximately twice as large as the interval between the adjacent mounting plates 5) and a conduit 11a
It has a plurality of nozzle members 11b attached to 11a, a connecting pipe 11c for connecting the conduit 11a and the hose 15, and a valve 11d attached to a part of the connecting pipe 11c.
In particular, the nozzle member 11b is configured to exhibit an injection effect. When compressed air is supplied from a compressor or a blower, the nozzle member 11b is configured to suction the atmosphere and eject a large amount of air.

The conduit 11a has a substantially center in the longitudinal direction facing the cutting torch 2 and is located at a position sufficiently higher than the upper end of the insert plate 5 constituting the surface plate C. The conduit 11a
The nozzle member 11b attached to the suction member 12 is attached toward the suction member 12 and obliquely downward with respect to the horizontal line, and the tip portion of each nozzle member 11b is located at a position slightly higher than the upper end portion of the insertion plate 5. Is set. Further, the connection pipe 11c is attached to the carriage 8 by a band-like attachment member 8a.

The carriage 8 is mounted on the cross garter 3b so as to be able to traverse. The carriage 8 is configured such that the injection nozzle 11 is
Has a function of approaching the end in the width direction of the material B to be cut, and does not need to be traversed during cutting. In other words, when cutting the workpiece B, the carriage 8 is traversed, the injection nozzle 11 is moved closer to the widthwise end of the workpiece B, and the position is set. May be.

Therefore, the carriage 8 may be configured to be driven by a motor and traverse along the cross garter 3b, or may be configured to allow an operator to traverse. In addition, it is preferable that the carriage 8 be configured to be able to be fixed at the position after moving to the optimum position with respect to the workpiece B.

The suction member 12 has a height substantially equal to the height of the insertion plate 5 constituting the surface plate C, and has a length in the direction along the rail 1 similar to that of the conduit 11 a of the injection nozzle 11. It is formed to have a length approximately twice the interval of 5. By setting the length of the conduit 11a and the length of the suction member 12 to these dimensions, even when the cutting torch 2 cuts across the insertion plate 5, the cutting torch 2 It is possible to discharge the smoke in a favorable condition facing the flue 7 to be formed.

The dust collector 13 is mounted on a garter 3c constituting the frame 3, and a duct 14 connecting the dust collector 13 and the suction member 12 is disposed between the rail 1 and the platen C and is crossed. It is fixed to the lower surface side of the garter 3b. Therefore, the suction member 12 is configured to be able to maintain the installation position without moving with respect to the cross garter 3b.

The duct 14 is connected to the suction side of the dust collector 13 and applies a negative pressure to the suction member 12 to suck and discharge smoke including dust in the flue 7. It is connected to the exhaust side and injects air from the injection nozzle 11 toward the flue 7 to discharge smoke containing dust in the flue 7 in the direction of arrow a in FIG.

At the tip of the cutting torch 2, a workpiece B
A hood 16 for sucking dust-containing smoke around the cutting torch 2 on the upper surface of the hood 16 is attached.
Is connected to the suction side of the dust collector 13 via a flexible hose 17. In particular, the lower end of the hood 16 is a cutting torch 2
And is configured to be able to prevent collision with the cut material B when moving on the cut material B as the cutting is performed. . Therefore, when the dust collector 12 is driven, the internal pressure of the hood 16 decreases,
It is possible to exhaust smoke containing dust in the hood 16.

Next, a description will be given of the smoke emission in the cutting machine A configured as described above. First, the material B to be cut is placed on the surface plate C.
Is placed. At this time, when the width dimension of the cut material B is smaller than the width dimension of the surface plate C, an open portion 9 that is not covered by the cut material B placed on the surface plate C is formed. .

It is not preferable that the open portions 9 are formed on both sides in the width direction of the material B to be cut. Therefore, when the workpiece B is placed on the surface plate C, it is preferable that the workpiece B be positioned closer to the suction member 12 of the smoke exhaust device D as a reference. It is preferable that the opening 9 to be formed is limited only to the injection nozzle 11 side.

After placing the workpiece B on the surface plate C, the carriage 8
Is traversed along the cross garter 3b so that the ejection nozzle 11 approaches the widthwise end of the material B to be cut constituting the open portion 9, and the ejection direction of the nozzle member 11b is changed to the material B
(See FIG. 4).

As described above, the injection nozzle 11 is
By moving the nozzle to a position close to the end of the stack, the injection nozzle 11 is arranged in the opening on one side of the flue 7 formed by the adjoining insert plate 5 and the material B to be cut, and suction is performed on the other side. The member 12 is located, and by ejecting and sucking fluid from both sides of the flue 7 by these members 11 and 12, it becomes possible to create an air flow in the direction of the arrow a inside the flue 7.

Therefore, when the material B is cut by operating the cutting torch 2 while operating the dust collector 13, smoke including dust generated by the cutting flows along with the airflow in the direction of the arrow a. The dust is sucked from the suction member 12 and collected by the dust collector 13. At the same time, smoke containing dust on the upper surface side of the workpiece B and around the cutting torch 2 is sucked from the hood 16 and collected by the dust collector 13.

In the above embodiment, the dust collector 13 is connected to the cutting machine A.
Is mounted on the garter 3c, but is not necessarily a dust collector.
The dust collector 13 does not need to be mounted on the garter 3c. The dust collector 13 is installed on the floor of a factory, and the dust collector 13 and the suction member 12 are connected via the duct 14.

[0045]

As described in detail above, in the smoke exhaust device of the thermal cutting machine according to the present invention, a traversable carriage is provided on the frame of the cutting machine, and an injection nozzle for injecting fluid to the carriage is provided. Therefore, when the material to be cut is placed on the surface plate and the width of the material to be cut is smaller than the width of the surface plate, the carriage is traversed and the injection nozzle is moved to the end in the width direction of the material to be cut. By approaching the vicinity, the fluid can be effectively injected into the flue constituted by the adjacent insert plate and the material to be cut. For this reason, regardless of the width dimension of the material to be cut, it is possible to surely and efficiently discharge smoke containing dust.

Further, smoke containing dust generated on the upper surface of the material to be cut and around the cutting torch can be sucked and discharged.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a cutting machine equipped with a smoke exhaust device according to the present embodiment.

FIG. 2 is a schematic front view of the cutting machine of FIG.

FIG. 3 is a perspective view illustrating a configuration of a truck and an injection nozzle.

FIG. 4 is a diagram illustrating a flow of a fluid when smoke is discharged.

[Explanation of symbols]

 Reference Signs List A Cutting machine B Material to be cut C Surface plate D Smoke exhaust member 1 Rail 2 Cutting torch 3 Frame 3a Saddle 3b Cross garter 3c Garter 4 Traversing carriage 5 Insert plate 6 Bottom plate 7 Flue 8 Truck 9 Opening part 11 Injection nozzle 11a Pipe 11b Nozzle member 11c Connection pipe 11d Valve 12 Suction member 13 Dust collector 14 Duct 15 Hose 16 Hood 17 Flexible hose

Claims (2)

[Claims] 1. A rail laid in a predetermined direction, and a surface plate configured by arranging a plurality of insertion plates in parallel in a direction intersecting with the rail laying direction, and placing a material to be cut on the insertion plate. A thermal cutting machine having a frame movably mounted on the rail and having a cutting torch movably mounted on the frame, and a cutting torch mounted on a frame constituting the thermal cutting machine arranged in a transverse direction. A suction member opened toward the space between the insert plates forming the surface plate and sucking smoke containing dust; and a suction member disposed opposite to the opening of the suction member with the cutting torch interposed therebetween and provided to be traversable on the frame. A thermal cutting machine, comprising: an insert plate attached to a trolley and configured as a surface plate; and an injection nozzle for injecting a fluid into a space formed by the material to be cut mounted on the insert plate. Smoke exhaust system. 2. A heat cutting machine according to claim 1, wherein a hood for sucking smoke containing dust from the periphery of the cutting torch is provided corresponding to a tip portion of the cutting torch. Smoke equipment.