JP2000052091A - Cutting table for thermal cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting table for a thermal cutting machine equipped with a device for effectively removing a harmful gas, harmful grain dust, and harmful ray generated at the time of cutting processing and a cooling device such as a spatter. SOLUTION: A water spraying member 27 is installed on an inside part of a housing-like table body 9 being opened at the top, and a collected dust discharging port 19 is opened on the side face of the table body 9. Then, a collected dust pipe 17 is connected to the port 19, and a cutting table 3 equipped with a light prevention plate 13 at the top side of the table body 9 is constituted. A processing head 5 is provided at the position adjacent to the cutting table 3, and a water curtain is formed at the bottom of a cutting processing part and the inside of the table body 9 at the time of cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting table for a thermal cutting machine which is suitable for processing harmful gases, harmful fine dust and harmful rays generated by cutting with a thermal cutting beam, and for cooling such as sputtering.

[0002]

2. Description of the Related Art Conventionally, when a workpiece is cut by a thermal cutter using energy such as laser or plasma, a workpiece is placed on a cutting table and a processing head for irradiating a laser, plasma or the like is placed above the cutting table. The workpiece is irradiated with a thermal cutting beam by the processing head, and is converted into thermal energy on the cut surface to perform fusing.

[0003] The cutting table for the thermal cutting machine has a harmful gas such as ozone, nitrogen oxide, carbon monoxide, and harmful gases such as fumes and spatters generated from a cutting portion and a processing head portion of the workpiece during the cutting process. A dust collecting device for removing fine dust and an upper cover member for shielding harmful rays such as ultraviolet rays and infrared rays are provided to improve the safety and health of the working environment.

FIG. 11 shows a schematic configuration of a conventional technique for this purpose.
This will be described with reference to FIG.

[0005] A table body 103 having a housing shape with an open top is provided above a bed 101 fixed to the floor surface, a flange 107 for supporting a skid 105 is provided around the opening of the table body 103, and a table body 10 is provided.
3, a dust collecting outlet 109A for connecting a dust collecting pipe 109 for sucking harmful gas and fine dust is opened.

The work W is placed on the upper part of the skid 105, and the work W becomes hot due to the generation of thermal energy at the time of cutting. However, heat loss due to contact heat conduction from the hot work W to the skid 105 is reduced. To this end, a plurality of protrusions 105A are formed on the upper surface of the skid 105.

A processing head 111 is provided above the table main body 103 to further shield harmful light L, which is a direct light generated by a laser, plasma or the like irradiated during processing and an indirect light reflected from the inside of the table main body 103. , A skid 105, and a large upper light prevention cover 113 that covers the processing head 111.

The table body 103, the skid 10
5. The cutting main body 115, which is the center of the thermal cutting machine, mainly includes the light prevention cover 113 and the processing head 111.

[0009]

The above-mentioned prior art has a configuration in which thermal energy and working energy such as operating gas from the processing head 111 are caused to flow downward and are blown onto the work W. The harmful gas G, the fine dust H, and the high-temperature molten droplet spatter S generated from the cutting portion due to the energy accompany the above-mentioned injection energy and assist gas, and the table body 10
3, and flows downward.

[0010] The harmful gas G, the fine dust H and the assist gas, which are heated by the heat insulation during the processing and have a high temperature, mainly flow in the center of the ejection center of the harmful gas. , Can be discharged from the dust collection outlet 109A through the dust collection pipe 109.

However, the low-energy harmful gas G, the fine dust H, and the assist gas having a low energy near the velocity boundary layer deviating from the main basin generate a natural convection force which becomes buoyant because of being low-speed and high-temperature. convective force overcomes the exhaust draft force of the dust collector, the gap portion of the end face W ₁ of the skid 105 and the workpiece W, and flows upward from the gap portion, such as a machining hole W ₂ opened to the workpiece W by the cutting, the chamber There is a problem that the work environment is deteriorated due to diffusion.

Further, since the molten high-temperature sputter S having large particles hits the bottom of the table main body 103 and is strongly welded, it is difficult to remove the welded sputter S. Body 103
There is a problem that it damages and further causes deformation and damage.

Further, at the time of cutting, harmful rays L generated from the fusing portion of the work W and the processing head 111 are reflected upward by the cutting waste (scrap) W ₃ falling on the bottom of the table main body 103, and are indirectly rays reflected upward through the end faces W ₁ and the gap portion of the machined hole W ₂ parts of W, to the shielding together directly rays from the machining head 111, the large upper light preventing cover 113 Therefore, when the work W is set on the skid 105, the large light-weight upper light prevention cover 1 must be provided.
Installation and removal work of 13 is required each time,
There is a problem that work efficiency is deteriorated.

In addition, a large upper light prevention cover 113
However, there is a problem that the structure is complicated and expensive parts are required, resulting in disadvantageous product cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to effectively remove harmful gas, harmful fine dust and harmful light generated during cutting, and to cool spatter. It is still another object of the present invention to provide a cutting table for a thermal cutting machine in which a light preventing plate for harmful light beams formed on the cutting table is small and operability is improved.

[0016]

According to a first aspect of the present invention, there is provided a cutting table for a thermal cutting machine, comprising: a work supporting member for placing a work in an opening of a table body; A water spray member for forming a water curtain is provided on the inner side surface portion, and the table main body is provided with a light preventing plate in a structure that does not block the loading and unloading of the work.

Therefore, when water is sprayed from the water spray member into the inside of the processing table body, a water curtain is formed,
This water curtain cools harmful gas and harmful fine dust to prevent diffusion into the room, absorbs harmful light and prevents reflection into the room, and makes the light prevention plate small, so that work can be carried in and out. In addition, it is possible to further prevent the spatter from cooling and welding to the wall surface of the table body. In addition, the dust collecting device and related devices of the dust collecting device can be eliminated.

A table for a thermal cutting machine according to a second aspect of the present invention
The cutting table for a thermal cutting machine according to claim 1, wherein an air jetting member for forming an air curtain is provided in the vicinity of the water spraying member, and a suction duct is provided on a side surface on the opposite side of the table body. Things.

Therefore, a water curtain and an air curtain are formed inside the cutting section and the table body, and by combining the water curtain and the air curtain, harmful gas and harmful fine dust are cooled to prevent diffusion into the room, By absorbing harmful rays and preventing reflection into the room, the light-prevention plate is made small, so that it does not hinder the loading and unloading of the work, and further cools the spatter and prevents it from being firmly welded to the wall of the table body. You.

According to a third aspect of the present invention, there is provided a cutting table for a thermal cutting machine, comprising a work supporting member for placing a work in an opening of a table main body, and a partition plate mounted inside the table main body to form a plurality of divided chambers. A water spray member for forming a water curtain is provided in each of the divided chambers, a dust collector is connected to each of the divided chambers, and the table body has a light prevention plate having a structure that does not hinder work loading and unloading. It is characterized by comprising.

Therefore, a high-concentration water curtain is formed in the cutting section only in the division chamber for cutting and the inside of the division chamber, and the water curtain cools harmful gas and harmful fine dust to the room. Prevents diffusion, absorbs harmful light rays and prevents reflection into the room, thereby minimizing the light-prevention plate, preventing the work from being carried in and out, cooling the spatter, and firmly welding it to the wall surface of the table body. Is prevented. In addition, the required spray amount can be reduced, and the size of the dust collecting device can be reduced and the dust collecting efficiency can be improved.

According to a fourth aspect of the present invention, there is provided a cutting table for a hot cutting machine according to the third aspect.
An air jetting member for forming an air curtain is provided on an upper portion of the table body, and a suction duct is provided on a side opposite to a position where the air jetting member is provided.

Therefore, a high-concentration air curtain is formed inside the cutting section and the table body, and the air curtain cools harmful gas and harmful fine dust to prevent diffusion into the room and absorbs harmful light. By preventing reflection into the room, the size of the light prevention plate can be reduced, so that it does not hinder the loading and unloading of the work, and further, the spatter can be cooled and firmly welded to the wall surface of the table body.

Further, even when harmful gas and harmful fine dust leak in the upper portion of the work, the suction processing is performed by the air curtain.

According to a fifth aspect of the present invention, there is provided a cutting table for a thermal cutting machine according to the first, second, third or fourth aspect, wherein a light preventing plate is attached to the table body via a hinge. It is characterized by the following.

Therefore, the work can be easily carried in and out by rotating the light prevention plate downward or to the side.

According to a sixth aspect of the present invention, there is provided a cutting table for a hot cutting machine according to the fifth aspect.
The light prevention plate is divided into a plurality of sheets, and the divided sections are attached via hinges.

Therefore, the height and angle of the light prevention plate can be adjusted more appropriately, and the work can be easily loaded and unloaded.

According to a seventh aspect of the present invention, there is provided the cutting table for a thermal cutting machine according to any one of the first to third aspects, wherein the light preventing plate is provided on the work supporting member side via a hinge on the table body. A transport member is attached to a part of the light-shielding plate which is kept horizontal by falling down.

Therefore, the work can be smoothly moved on the light prevention plate, and the work efficiency is improved.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIGS. 1 and 2, there is provided a cutting table 3 which can be moved on a fixed bed 1 in a horizontal direction or the like, and a laser, a plasma or the like which can be moved to a position close to the cutting table 3. A cutting main body 7 including a processing head 5 for irradiating a cutting beam and an assist gas is configured.

Further, a power supply device, an assist gas supply device, a cooling water supply device, a control device, and the like necessary for operating the cutting body 7 are attached to constitute the entire equipment of the thermal cutting machine. Each of the attached devices of the present invention is constituted by a very common and well-known technology, and the description thereof will be omitted.

The cutting table 3 has a housing-shaped table main body 9 that opens upward, a skid 11 as an example of a work supporting member provided in the opening of the table main body 9, and one side in the upper part of the table main body 9. The light prevention plate 13 is provided.

The table body 9 is provided with a flange 15 for supporting the skid 11 at an opening end, an opening for a dust collecting outlet 19 for connecting a dust collecting pipe 17 on an inner surface, and a drain pipe 21 connected to a lower part. A drainage port 23 is opened, and a dust collector 25 is connected downstream of the dust collection pipe 17.

The skid 11 has a work W mounted thereon for cutting. The work W becomes hot due to the generation of thermal energy during cutting. Therefore, the contact heat from the hot work W to the skid 11 is high. In order to reduce the heat loss due to conduction and improve the cutting efficiency, the overall arrangement of the skids 11 is widened and arranged in a cage shape, and a plurality of projections 11A are formed on the upper surface of each skid 11, thereby forming a work W The heat loss due to contact heat conduction between the skid 11 and the skid 11 is reduced.

A water spray member 27 is disposed on the inner side of the table body 9 so that its longitudinal direction is substantially horizontal.
The water spray member 27 has a plurality of spray nozzles 29 each having a small diameter at an appropriate pitch.

The spray nozzle 29 is provided with a water spray member 27.
The spray direction can be freely changed by an appropriate mechanism such as a mechanism for rotating the shaft about a center line in the axial direction and an angle adjustment attachment.
An appropriate mechanism may be provided so as to adjust the direction by setting an optimum injection angle which differs depending on the structure of the dust collecting device 25, the exhaust draft capacity of the dust collector 25, the shape of the work W, and the like.

In the normal spraying direction, the dust collecting device 25 is set horizontally or obliquely upward in consideration of the draft flow.

When the water spray members 27 are formed on a plurality of surfaces in the table main body 9, the spray nozzles 29 of the water spray member pipes 27 having different mounting positions are arranged in a staggered manner, and mutual interference of the velocity energy of the spray is performed. May be reduced.

Whether the water spraying member 27 is disposed on the entire inner surface, the opposing inner surface, or only one side is determined by the structural dimensions of the table body 9 and the dust collection. What is necessary is just to select appropriately so that an effective water curtain B can be formed by the draft function of the device 25, etc., and it is not particularly specified in the present invention.

The light preventing plate 13 has a screen-like shape for a function of blocking only a direct light beam from the processing head 5.
The upper part of the table body 9 is provided at a position to be the front of the worker.

When cutting is performed in the state shown in FIGS. 1 and 2 according to the above configuration, the work W is placed on the skid 11 and the dust collecting device 25 is operated to operate the dust collecting outlet 1.
Exhaust air is generated from the inner surface of the table body 9 to generate an airflow mainly descending.

Next, high-pressure water is supplied to the water spraying member 27, and water is jetted at a very high speed from the spray nozzle 29 having a small diameter.
The water is made into a curtain shape by colliding with the atmosphere, and the generated water curtain is adjusted by adjusting the jetting direction of the spray nozzle 29 by the above-mentioned appropriate means. A water curtain B is formed below the work W and inside the table body 9.

After the above-described preparation operation for cutting is completed, the work W is placed on the skid 11 and the processing head 5 is operated to irradiate a thermal cutting beam. At the same time, either the processing head 5 or the cutting table 3 is used. Alternatively, both are moved in the set direction, and the work W is cut.

The harmful gas G such as high-temperature ozone, the fine dust H such as fume, and the sputter S generated by the cutting process are injected downward together with the assist gas, and the harmful light L such as ultraviolet rays is irradiated on the entire circumference. You.

Among the above harmful substances, the harmful gas G and the fine dust H having a small heat capacity and a high temperature first enter the water curtain B, and the harmful gas G and the fine dust H are mixed with the mist to exchange heat and form water droplets. Cooled by the latent heat of evaporation of the fog.

In particular, the harmful gas G and the fine dust H on the non-mainstream side near the velocity boundary layer are low in speed, have a high cooling effect, lose buoyancy, become downdraft, and combine with the downward draft force of the dust collector 25. Then, the dust flows into the dust collecting device 25 from the dust collecting outlet 19 through the dust collecting pipe 17 and is purified.

High-speed mainstream harmful gas G other than the above flow
Further, the fine dust H can be re-cooled by the water curtain B even if the cooling effect is somewhat poor. In addition, since the kinetic energy of the injection is large, the fine dust H may continue to flow downward, reach the dust collection outlet 19, be discharged, and leak to the outside. Absent.

The large-particle sputter S among the sputter S is
Since the kinetic energy and the potential energy are high, there is no flow due to upward buoyancy, and the trajectory follows only the downward jet direction.

Since the large-particle sputter S has a large heat capacity and is in a high-temperature molten state, it enters the water curtain B, performs liquid heat exchange with a high heat transfer coefficient, and instantaneously becomes low-temperature.
The sputter S in the molten state is solidified.

The solidified sputter S is not welded to the inner wall of the table main body 9, but is deposited as solid particles on the bottom surface.

Even if there is a mirror-like cutting waste (scrap) W _{3 on} the bottom surface of the table main body 9 and a small amount of harmful light L reaches the bottom surface and irradiates the cutting waste W ₃ , the cutting waste W _3
The indirect rays reflected from ₃ are reabsorbed when passing through the upper water curtain B, and are not reflected from the upper portion of the table body 9.

The harmful light L is applied directly to the peripheral portion from the processing head 5, but the direct light can be protected by the light preventing plate 13 having a simple structure.

FIG. 3 shows another embodiment.
In FIG. 3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 3, a water curtain member 33 having a fountain slit 35 opened on the inner side surface of a table body 37.
Let me only place.

When a plurality of water curtain members 33 are formed on a plurality of inner side surfaces of the table main body 37, the water curtain members 33 on the respective surfaces may be arranged at the same height, or a step may be formed in the vertical direction. The staggered arrangement provided with the fountain slits, and an appropriate configuration such as adjusting the jetting direction of the fountain slit 35 so that the velocity energies of the water curtains do not interfere with each other may be adopted.

Whether the water curtain member 33 is disposed on the entire inner surface, the opposing inner surface, or only one side is effectively determined by the structural size of the table body 37. What is necessary is just to select suitably so that the water curtain B can be formed, and it is not prescribed | regulated in this Embodiment.

Further, the drain pipe 21 is provided below the table body 37.
The cutting table 39 is formed by opening the drain port 23 to which the cutting table 39 is connected.

Therefore, the water spray member 27 and the spray nozzle 29 configured in the embodiment shown in FIGS. 1 and 2 are not provided, and the dust collection outlet 19, the dust collection pipe 17, and the dust collection device 25 are not provided. Configuration.

With the above configuration, when cutting is performed in the state shown in FIG. 3, an appropriate purifying device such as a water purifier connected to the drain pipe 21 is operated, and the water curtain member 33 Water is supplied, and a water film is sprayed in a substantially horizontal direction from the fountain slit 35 to form a water curtain B in the table body 37.

After the preparation operation for the cutting process is completed, the work W is placed on the skid 11 and the working head 5 is operated to irradiate a thermal cutting beam. At the same time, either the working head 5 or the cutting table 39 is used. Alternatively, both are moved in the set direction, and the work W is cut.

The high-temperature harmful gas G, fine dust H, and spatter S generated by the cutting process are jetted downward together with the assist gas, and the harmful light L is applied to the entire circumference.

Among the harmful substances, the harmful gas G and the fine dust H having a small heat capacity and high temperature enter the water curtain B, and the harmful gas G and the fine dust H are mixed with water and absorbed.

In particular, the harmful gas G and the fine dust H on the non-mainstream side near the velocity boundary layer are low in speed and have a high absorption effect, are well absorbed by water, and are discharged from the drain port 23.

High-speed mainstream harmful gas G other than the above-mentioned flow
And the fine dust H is absorbed sequentially as it goes to the lower water curtain B even if the absorption effect is somewhat poor, and is drained from the drain port 23. The contaminated drain water is removed by an appropriate purification device connected to the drain pipe 21. It is processed.

Among the sputter S, the sputter S of large particles is
Following the flight trajectory only in the downward jet direction, water curtain B
, The liquid heat exchange having a high heat transfer coefficient is performed, the temperature instantaneously becomes low, and the sputter S in a molten state solidifies.

The solidified sputter S does not fuse to the inner wall of the table main body 37 but becomes solid particles and accumulates on the bottom surface.

The harmful ray L is radiated from the cutting portion. However, since the water curtain B is generated in the tape main body 37, the harmful ray L applied to the water curtain B is reflected inside the water flow. The harmful ray L that is absorbed and attenuated by water while repeating refraction and attenuates from the water is also repeatedly incident on another water flow, reflected, refracted and attenuated,
The harmful rays L are sequentially absorbed in the water stream.

Therefore, the harmful light L does not reach the bottom surface of the table body 37 or is very small.

[0071] Also if there is mirror-like cuttings (scrap) W ₃ on the bottom surface of the table body 37, even harmful rays L traces were irradiated with the swarf W ₃ reaches the bottom, the swarf W ₃ The reflected indirect light rays are reabsorbed when passing through the upper water curtain B, and are not reflected from the upper portion of the table body 37.

The harmful light L is directly reflected from the processing head 5 to the peripheral portion, but the direct light can be protected by the light prevention plate 13 having a simple structure.

FIG. 4 shows another embodiment.
4, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 4, a cutting table 41 is provided on the bed 1 and a cutting head 43 is provided above the cutting table 41 to constitute a cutting body 43. Is attached, but this device is the same as the above-described embodiment of the invention,
Detailed description is omitted.

The cutting table 41 is provided with a housing-shaped table main body 45 which is open upward, a flange 15 for supporting the skid 11 is provided at an open end of the table main body 45, and a dust collecting pipe is provided on a side surface. A dust collecting outlet 19 for connecting the dust collecting pipe 17 is opened, a light preventing plate 13 is provided above the cutting table 41, and a dust collecting device 25 is provided downstream of the dust collecting pipe 17.

The skid 11 and the dust collector 25
Has the same basic configuration as the above embodiment.

A water spray member 27 is disposed on the inner side surface of the table body 45 so that the longitudinal direction thereof is substantially horizontal. A plurality of spray nozzles 29 are attached to the water spray member 27 at an appropriate pitch. Can be

The spray nozzle 29 is provided with the water spray member 27.
Alternatively, the spray direction may be changed by an appropriate mechanism such as a mechanism for rotating the spray nozzle 29 around an axial center line, or attaching an angle adjustment attachment to the spray nozzle 29.

An air jetting member 47 is provided on the upper portion of the table body 45, and an air slit 47A is formed on the air jetting member 47 so that the air jetting direction is substantially horizontal and in a film form.
Open.

Further, an air slit 4 is provided on the upper side of the table body 45 at a position opposite to the air jetting member 47.
A suction duct 49 which is open in a wide shape in the horizontal direction is provided opposite to 7A. A suction pipe 49A connected to the suction duct 49 is joined to the dust collection pipe 17 and connected to the dust collection device 25.

However, in this embodiment, the dust collector 25
May be separately provided for each of the suction pipe 49A and the dust collecting pipe 17, and a method of connecting to the dust collecting device 25 is not particularly limited.

Here, the high-pressure air in the air jetting member 47 is jetted from the air slit 47A in the form of a film in a substantially horizontal direction, and the direction of the air is caused to flow toward the suction duct 49 to generate the air curtain A. I do.

In the course of the air flow of the air curtain A, the air jetting member 47 and the suction duct 47 are arranged so that the main flow of the air does not affect the flow direction of the assist gas, arc or the like ejected from the processing head 5. Arrangement position such as height direction is appropriately selected.

With the above configuration, when cutting is performed in the state shown in FIG. 4, the work W is placed on the skid 11, the dust collecting device 25 is operated, and the suction duct 49 and the dust collecting pipe 17 are arranged. The air is further exhausted to generate an airflow in the upper space and the inner space of the table body 45.

Next, high-pressure water is supplied to the water spray member 27, and water is jetted from the spray nozzle 29 having a very small diameter at an extremely high speed.
The water curtain is formed by colliding with the atmosphere, and the generated water curtain is adjusted by adjusting the jetting direction of the spray nozzle 29 by the above-mentioned appropriate means.
To form a water curtain inside the work W portion of the cutting portion and inside the table body 45.

A high-pressure air is passed through the air jetting member 47 and air is jetted in a substantially horizontal direction from an air slit 47A to form an air curtain A on the upper portion of the table body 45.

After the preparation operation for the cutting process is completed, the work W is placed on the skid 11 and the cutting head 5 is operated to inject cutting energy, and at the same time, either the cutting head 5 or the cutting table 41 or Both are moved in the set direction, and the work W is cut.

The high-temperature harmful gas G, fine dust H, and spatter S generated by the cutting process are both injected downwards with the assist gas, and the harmful light L is irradiated all around.

Among the harmful substances, the harmful gas G and the fine dust H having a small heat capacity and high temperature enter the water curtain B, and the harmful gas G and the fine dust H are mixed with water and absorbed.

In particular, the harmful gas G and the fine dust H on the non-mainstream side near the velocity boundary layer are low in speed, have a high cooling effect, lose buoyancy and become a downward airflow, and are combined with the downward draft force of the dust collector 25. Then, the dust flows into the dust collecting device 25 from the dust collecting outlet 19 through the dust collecting pipe 17 and is purified.

A high-speed mainstream harmful gas G other than the above flow
Further, the fine dust H has a large kinetic energy of the injection even though the cooling effect is somewhat inferior.
9 and is not discharged to the outside.

Further, even if the water curtain is insufficiently generated due to the clogging of the spray nozzle 29 or some malfunction of the equipment and the harmful gas G and the fine dust H flow above the table body 45, the air curtain A suctions the suction duct 49. It does not diffuse into the room.

Since the large-particle sputter S has a large heat capacity and is in a high-temperature molten state, it enters the water curtain B, performs liquid heat exchange with a high heat transfer coefficient, and instantaneously becomes low-temperature and solidifies.

The harmful light rays L are emitted from the cutting portion, but are absorbed because the water curtain B is formed around the cutting portion and inside the tape main body 45.

[0095] Further is there mirror-like swarf W ₃ on the bottom of the table body 45, harmful rays L of trace reaches the bottom, even if irradiated with the swarf W _3, reflected from the swarf W ₃ The indirect light rays are reabsorbed when passing through the upper water curtain B, and are not reflected from the upper portion of the table body 45.

The harmful light L is reflected directly from the processing head 5 to the peripheral portion, but the direct light can be protected by the light prevention plate 13 having a simple structure.

FIG. 5 shows another embodiment.
5, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 5, a cutting table 51 is provided on the bed 1, a cutting head 5 is provided above the cutting table 51, and a light preventing plate 13 is provided above the cutting table 51 to form a cutting body 53. To configure, and further attach the equipment necessary for the operation of the cutting body 53,
This device is the same as the above-described embodiment of the present invention, and the detailed description is omitted.

The table body 55 provided on the cutting table 51 and having an open top has a flange 15 for supporting the skid 11 at an open end. The basic configuration of the skid 11 is the same as that of the above embodiment.

A water spraying member 27 is disposed on the inner surface of the table body 55 so that its longitudinal direction is substantially horizontal.
A plurality of spray nozzles 29 whose ejection ports are minute in diameter are attached to the water spray member 27 at an appropriate pitch.

The spray nozzle 29 is provided with the water spray member 27.
The spray direction may be changed by a suitable mechanism such as a mechanism for rotating the spray nozzle about a center line in the axial direction and an angle adjusting attachment to the spray nozzle 29.

An air jetting member 47 is provided in the vicinity of the portion where the water spraying member 17 is provided, and the air curtain member 47 is provided.
An air slit 47A is opened so that the shape of the jet of air becomes a film.

Further, on the inner side of the table body 41, on a side surface opposite to the air curtain tube 45, there is provided a suction duct 57 which is open in a wide shape in the horizontal direction, facing the air slit 47A. Dust collection pipe 1
7 and a dust collecting device 2 is provided downstream of the dust collecting pipe 17.
5 is provided.

With the above configuration, when cutting is performed in the state shown in FIG. 5, the work W is placed on the skid 11, the dust collecting device 25 is operated, and air is exhausted from the dust collecting pipe 17. This causes a moving airflow inside the table main body 55.

Further, high-pressure air is supplied to the air curtain member 47, the air is jetted from the air slit 47A in a substantially horizontal direction, and the direction of the air flows toward the suction duct 57 to generate the air curtain A.

Next, high-pressure water is supplied to the water spray member material 27, water is jetted from the spray nozzle 29 having a very small diameter at an extremely high speed, and the water is impinged on the atmosphere to form a water curtain. The spray direction of the spray nozzle 29 is adjusted by appropriate means in the same manner as in the above-described embodiment, and sprayed onto the cutting portion or the upper space of the table body 55 to partition the cutting portion and the internal space of the table body 55. .

Therefore, the air curtain A is replaced with the water curtain B
The water curtain B generated above the air curtain A is blocked or restricted from moving downward by the air curtain A, and has a function of reliably forming the water curtain.

After the preparation operation for cutting is completed, the work W is placed on the skid 11 and the processing head 5 is operated to irradiate a thermal cutting beam. At the same time, either the processing head 5 or the cutting table 51 is used. Alternatively, both are moved in the set direction, and the work of cutting the workpiece W is performed in the same manner as in the above-described embodiment.

The high-temperature harmful gas G, the fine dust H and the sputter S generated by the cutting process are jetted downward together with the assist gas, and the harmful light L is irradiated on the entire circumference as in the above-described embodiment. Have the same functions and effects.

Particularly, the harmful gas G and the fine dust H in the vicinity of the velocity boundary layer have a high cooling effect due to the low speed, lose buoyancy and become a descending airflow, and are then sucked by the air curtain A to the dust collecting pipe 17 from the suction duct 57. Can be discharged.

High-speed mainstream harmful gas G other than the above flow
Even if the cooling effect is somewhat poor, the fine dust H has a large amount of kinetic energy of the injection, and therefore descends without changing the flow upward, is sucked by the suction duct 57 by the lower air curtain A, and 17 so that there is no leakage to the outside.

Among the sputter S, the sputter S of large particles is
Due to the high kinetic energy, there is no flow due to upward buoyancy, and the trajectory follows only the downward jet direction.

Since the large-particle sputter S has a large heat capacity and is in a high-temperature molten state, it enters a water curtain, performs liquid heat exchange with a high heat transfer coefficient, and instantaneously cools and solidifies.

The harmful light rays L are emitted from the cutting portion, but since the water curtain B is formed around the cutting portion (particularly, the lower surface of the work W) and the inside of the tape body 55, Absorbed.

Therefore, the harmful light L does not reach the bottom surface of the table main body 55 or is very small.

[0116] Also if there is mirror-like cuttings (scrap) W ₃ on the bottom surface of the table body 55, even harmful rays L traces were irradiated with the swarf W ₃ reaches the bottom, the swarf W ₃ Are reflected by the water curtain B again and are not reflected from the upper portion of the table body 55.

The harmful light L is reflected directly from the processing head 111 to the peripheral portion, but the direct light can be protected by the light prevention plate 13 having a simple structure.

The air curtain A has the same effect even when the above-mentioned equipment is positioned so as to be generated above the water curtain B.

FIGS. 6 and 7 show another embodiment. 1 and 2 are denoted by the same reference numerals, and redundant description will be omitted.

6 and 7, a cutting table 59 is provided on the bed 1, a processing head 5 is provided above the cutting table 59, and a light preventing plate 61 is provided above the cutting table 59 for cutting. The processing main body 63 is configured.

Further, equipment necessary for the operation of the cutting main body 63 is attached. This equipment is basically the same as that of the above-described embodiment, and the detailed description is omitted.

The housing-shaped table main body 65 provided on the cutting table 59 has an opening at the top, and a flange 15 for supporting the skid 11 is provided at the opening end. A partition plate 67 for partitioning into a row is attached to the table body 65.
A plurality of divided chambers 67A are formed inside.

In the present embodiment, the division chamber 67A will be described as being divided into four parts. However, the number of divisions may be appropriately selected from the dimensional configuration of the entire cutting table 65, and is not particularly limited in this embodiment.

A dust collecting outlet 69 is opened on the inner surface of each of the partitioned divided chambers 67A, and a gas permeable wall member 71 made of punching metal or the like closes the dust collecting outlet 69 to the inside of the divided chamber 67A. Constitutes a dust collecting chamber 67B.

Each of the dust collecting outlets 69 has a dust collecting pipe 7.
3 is attached, and the downstream side of the dust collecting pipe is joined so as to form a single pipe, and a dust collecting device 75 is connected to the dust collecting pipe 73 after the joining.

Further, a shutter device 77 that opens and closes is provided in a flow path of the dust collecting pipe 73 connected to the exhaust port 69,
Each of the shutter devices 77 can be freely opened and closed independently by a device that opens and closes an internal shutter.

The basic structure of the skid 11 is the same as that of the above embodiment.

On the inner surface of each of the divided chambers 67A of the table body 65, a water spraying member 79 independently formed for each of the divided chambers 67A is disposed so that its longitudinal direction is substantially horizontal.
A plurality of spray nozzles 29 having fine spray ports are attached to the water spray member 79 at an appropriate pitch.

The spray nozzle 29 is provided with a water spray member 79.
A mechanism capable of changing the spray direction by a suitable mechanism such as a mechanism for rotating the shaft about a center line in the axial direction and an angle adjustment attachment to the spray nozzle 29 may be used.

A water supply pipe 81 is connected to each of the water spray members 79 provided for each of the divided chambers 67A, a valve 83 is attached to each of the water supply pipes 81, and the water supply pipes 81 on the upstream side of the valve 83 are joined to form a single pipe. To

Each of the valves 83 can be freely opened and closed independently by a device for opening and closing the internal valve.

The above-described shutter device 77 and valve 83
The opening and closing operation of the processing head 5 is located above a certain divided chamber 67A.
Move, each damper device 77 and the valve 83
And a signal is sent to the divided chamber 67A below the machining head 5.
The automatic control is performed so that only the shutter device 77 and the valve 83 connected to are opened and the other shutter devices 77 and the valve 83 are closed.

However, the opening and closing of the shutter device 77 and the valve 83 can be performed by automatic control or manual operation, so that the basic function of the thermal cutting machine can be similarly exhibited. Therefore, an appropriate operation method may be selected. The means of operation is not limited.

When cutting is performed in the state shown in FIG. 6 and FIG.
The work W is placed on a part or the entire required part of the skid 11 provided in the above, and the processing head 5 or the cutting is positioned so that the processing head 5 is positioned at the cutting processing start point on the upper part of the division chamber 67A where the cutting is started. The table 59 is moved.

By the above operation, the shutter device 77 and the valve 83 connecting the machining head 5 to the upper divided chamber 67A are opened, and the shutter device 77 and the valve 83 of the other divided chamber 67A are closed.

Next, the dust collecting device 75 is operated, and only the divided chamber 67A is evacuated from the dust collecting pipe 73 to generate a moving airflow inside the divided chamber 67A.

In the prior art means, a large dust collecting device 25 is required for suctioning from the wide exhaust passage of the entire cutting table without partitions, whereas the air flow of the present invention has a narrow flow passage. Since the dust collection and exhaust is performed from the divided chamber 67A of the formed small chamber, the small dust collector 75 can be configured to exhibit the same or higher dust collection performance.

When the dust collecting device 25 having the same performance as the conventional device is combined, the matching point between the blower of the dust collecting device 25 and the exhaust duct resistance changes to the high pressure side, and the divided chamber 67
The pumping speed of A is increased several times, and the dust collection efficiency is improved, which is more effective in reducing the diffusion of harmful gas and fine dust from the upper part of the cutting table 59.

Next, high-pressure water is supplied to the water spraying member 79, and water is jetted from the spray nozzle 29 having a very small diameter at an ultra-high speed to impinge on the atmosphere to form a water curtain B. The spray direction of the spray nozzle 29 is adjusted by an appropriate means as described in the above embodiment, and is sprayed into the cutting section and the inside of the divided chamber 67A, so that the divided chamber 6A is sprayed.
Water curtain B on the cutting part of 7A and the upper space inside
Will be formed.

After the above operation is completed, the processing head 5 is operated to irradiate a thermal cutting beam, and at the same time, one or both of the processing head 5 and the cutting table 59 are moved in the set direction. Similarly, the work of cutting the work W is performed.

When the work of cutting the work W located in the division chamber 67A is completed, the machining head 5 is moved to another division chamber 67A.
To the shutter device 77 and the valve 8
In No. 3, the opening / closing operation is switched as described above, the cutting is re-processed in the switched divided chamber 67A, and the processing head 5 sequentially moves above the divided chamber 67A to repeat the cutting.

The high-temperature harmful gas G, the fine dust H and the sputter S generated by the cutting process are jetted downward together with the assist gas, and the harmful light L is irradiated on the entire circumference in the same manner as in the above embodiment. Have the same functions and effects.

In particular, the harmful gas G fine dust H near the velocity boundary layer has a high cooling effect due to the low speed, loses buoyancy and becomes a downdraft, and the airflow flows to a high exhaust draft due to the division of the room of the table body 65. The dust is synthesized and can be discharged to the dust collecting pipe 73 from the dust collecting outlet 69.

High-speed mainstream harmful gas G other than the above flow
The fine dust H has a large injection kinetic energy and a high exhaust draft force even if the cooling effect is somewhat inferior, so that it does not change upward and efficiently reaches the dust collecting exhaust port 69 to reach the dust collecting pipe 73. It emits more and does not leak outside.

Among the spatters S, large-particle sputters S
Due to the high kinetic energy, there is no flow due to upward buoyancy, and the trajectory follows only the downward jet direction.

Since the large-particle sputter S has a large heat capacity and is in a high-temperature molten state, it enters the water curtain B, performs liquid heat exchange with a high heat transfer coefficient, instantaneously becomes low-temperature and solidifies.

The harmful ray L is emitted from the cutting portion, but is absorbed by forming a water curtain B around the cutting portion.

Therefore, the harmful light L does not reach the bottom surface of the table main body 65 or is very small.

[0149] Further the mirror-like cuttings (scrap) W ₃ In the bottom surface of the table body 65, harmful rays L of trace reaches the bottom, even if irradiated with the swarf W _3, swarf W ₃ The indirect light rays reflected from the table body 65 are re-absorbed by the water curtain B, and are not reflected from the upper portion of the table body 65.

The harmful light L is reflected directly from the processing head 5 to the peripheral portion, but the direct light can be protected by the light preventing plate 13 having a simple structure.

The shutter device 77 and the valve 8
3, the flow of the flow path may be controlled by other appropriate means.
The configuration is not limited to 7 and the valve 83.

FIG. 8 shows a specific embodiment of the light prevention plate. In FIG. 8, a lower portion of a light prevention plate 85 is attached to a table main body 9 by a hinge 87 so as to be rotatable. The configuration of the other cutting table 3 is basically the same as that of the above-described embodiment. is there.

With this configuration, when the work W is placed on the skid 11, the light prevention plate 85 can be rotated downward as shown by a two-dot chain line, so that the work W can be carried in and out easily.

After the work is completed, the light prevention plate 85 is rotated upward to provide a light shielding function for preventing a heat cutting beam at the time of cutting as in the above embodiment.

FIG. 9 shows another embodiment instead of FIG. In FIG. 9, the light prevention plate 8 is attached to the table body 9.
The lower side of the cutting table 9 is attached by a hinge 91 so as to be rotatable vertically and horizontally. The configuration of the other cutting table 3 is basically the same as that of the above-described embodiment of FIG.

Further, when the work W is carried into the light preventing plate 89, the work W is rotated so as to be horizontal as viewed from FIG. 9, and a transport member 9389 such as a free bear is mounted on the horizontal light preventing plate 89. I do.

When the work W is placed on the skid 11 with the above configuration, the light prevention plate 89 is rotated to a horizontal position, and the work W slides on the upper surface of the transport member 93, thereby facilitating the loading / unloading operation.

After the work W is placed on the skid 11, the light prevention plate 89 is rotated upward as shown by a two-dot chain line to provide a light blocking function at the time of cutting work as in the above-described embodiment.

FIG. 10 shows another embodiment which is further alternative to FIG. In FIG. 10, a light prevention plate 95 is divided into two upper and lower plates on a table body 9 and hinges 87 are attached in two stages so as to be rotatable. The configuration of another heat cutting machine is the same as that of each of the above embodiments. Basically the same.

When the work W is placed on the skid 11 with such a configuration, the light prevention plate 95 is rotated downward to facilitate the work of loading and unloading the work W. After the work is completed, the light prevention plate 95 is rotated upward to provide a light shielding function at the time of the cutting work as in the above-described embodiment.

Therefore, by adjusting the angle of the upper light prevention plate 95, it is possible to adjust the optimum angle and height of the light shielding.

In the above embodiment, the light-blocking plate 95 is divided into two parts.
The present invention can be applied with an appropriate number of divisions depending on the function.
There is no particular restriction on the number of divisions of the light prevention plate 95.

The method of forming a water curtain according to the present invention described in the above embodiment uses a high-pressure water spray nozzle 2 having a small diameter.
Although it depends on means for jetting at a speed higher than 9, the present invention is not limited to the above-described embodiment of the invention, but can be implemented in other modes by making appropriate changes.

[0164]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, a water curtain member is provided on the inner side surface of the table main body, and water is provided inside the table main body. Form a curtain.

The water curtain cools harmful gases such as ozone and nitrogen oxides and harmful fine dusts such as fumes to prevent diffusion into the room. This has the effect of preventing the irradiation of the spatter, completely cooling and solidifying the spatter, and preventing the spatter from being welded to the wall surface of the table body, thereby improving the safety and health of the working environment.

Further, since the dust collector and the related equipment of the dust collector can be eliminated, the production cost of the cutting machine can be reduced, and the maintenance and management of the exhaust gas cleanliness can be eliminated.

Further, the light preventing plate is made small and simple in structure, so that there is an effect that the work efficiency of loading / unloading the work can be improved and the manufacturing cost can be reduced.

According to the second aspect of the present invention, the air curtain member is provided near the water curtain member, and the water curtain and the air curtain are formed double in the cutting portion and the inside of the processing table body. .

The water curtain cools harmful gases such as ozone and nitrogen oxides and harmful fine dust such as fumes to prevent diffusion into the room, and the air curtain reliably collects and exhausts air. The water curtain absorbs harmful rays to prevent reflection into the room, and also has the effect of cooling the spatter to prevent it from being firmly welded to the wall surface of the table body, thereby improving the safety and health of the working environment.

Further, the light preventing plate is made small and simple in structure, which has the effect of improving the working efficiency and reducing the manufacturing cost of the cutting machine.

According to the third aspect of the present invention, a partition plate is attached to the table body to form a plurality of divided chambers, each of the divided chambers is provided with a water spray member, and each of the divided chambers is provided with a dust collecting and discharging member. The outlet is opened, and a water curtain is formed only in the divided chamber where the cutting process is performed, and exhaust is simultaneously performed.

The divided chamber during the cutting process cools harmful gases such as ozone and nitrogen oxides and harmful fine dusts such as fumes by a water curtain to prevent diffusion into the room. It can absorb harmful rays and prevent reflection into the room, and can also prevent the spatter from cooling and firmly adhering to the wall of the table body. Further, it is possible to reduce the size of the dust collector and improve the dust collection efficiency. This has the effect of reducing the manufacturing cost of the thermal cutting machine and improving the safety and health of the working environment.

In addition, the light preventing plate is small and has a simple structure, so that the work efficiency of loading and unloading the work can be improved and the manufacturing cost of the thermal cutting machine can be reduced.

According to the fourth aspect of the present invention, an air curtain member is provided above the cutting table, and a water curtain is formed inside the cutting section and the table body.

The water curtain cools harmful gas and harmful fine dust to prevent diffusion into the room, absorbs harmful light to prevent irradiation into the room, cools spatter, and cools the spatter onto the wall surface of the table body. This has the effect of preventing firm welding.

Further, even if harmful gas and harmful fine dust leak at the upper part of the work due to a malfunction of the processing equipment of the thermal cutting machine, the suction processing can be performed by the air curtain.
Work environment safety and health can be further improved.

According to the fifth aspect of the present invention, the light preventing plate is attached to the cutting table via the hinge.

By rotating the light-shielding plate downward, the work can be easily carried in and out, and the work efficiency can be improved. Also, the work can be shielded by rotating the light-shielding plate upward so that the work environment is safe and sanitary. Can be improved.

According to the device of the sixth aspect of the present invention, a plurality of light prevention plates are provided, and each light prevention plate is connected by a hinge.

Thus, the mounting angle of the light prevention plate and the light shielding height can be adjusted, and there is an effect that the work can be easily carried in and out.

According to the seventh aspect of the present invention, the conveying member is attached to a part of the light prevention plate.

By rotating the light prevention plate downward, the work can be smoothly transported by the transport member on the plate prevention, and can be rotated upward to shield the light during the cutting operation, thereby ensuring the safety of the working environment. Hygiene can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cutting table provided with a water spray member and a water curtain member in a table main body according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a longitudinal sectional view of a cutting table provided with a water curtain member in a table main body according to another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a cutting table in which an air curtain member is provided on a table body in another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a cutting tail provided with a water spray member and an air curtain member in a table main body according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a cutting table in which a division chamber is provided in a table main body according to another embodiment of the present invention.

FIG. 7 is a view taken along the line VII-VII in FIG. 6;

FIG. 8 is a side view of a portion of a light prevention plate provided with a hinge according to another embodiment of the present invention.

FIG. 9 is a side view of a portion of a light prevention plate provided with a conveying member according to another embodiment of the present invention.

FIG. 10 is a side view of a part of a light prevention plate provided with two hinges according to another embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of a conventional cutting table.

FIG. 12 is a sectional view taken along the line XII-XII of FIG. 11;

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 cutting table 5 processing head 9 table body 11 work supporting device 13 light prevention plate 17 dust collecting pipe 21 drain pipe 25 dust collecting device 27 water spray member 29 spray nozzle 33 water curtain member 35 fountain slit 47 air curtain member 47A air slit 49 Suction duct 57 Suction duct 87 Hinge 93 Transport member

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B23K 26/16 B23K 26/16 F term (Reference) 4E001 AA01 DD07 DD08 LA05 LD05 LD13 4E068 AE00 CE09 CF04 CG02 CJ03 CJ08

Claims (7)

[Claims] 1. A work supporting member for placing a work on an opening of a table main body, a water spraying member for forming a water curtain on an inner side surface of the table main body, and a work loading / unloading operation for the table main body. What is claimed is: 1. A cutting table for a thermal cutting machine, comprising: a light-preventing plate having a structure not to be used. 2. The thermal cutting machine according to claim 1, wherein an air jetting member for forming an air curtain is provided in the vicinity of the water spraying member, and a suction duct is provided on a side surface opposite to the table body. For cutting table. 3. A work supporting member for mounting a work in an opening of a table body, a partition plate is mounted inside the table body to form a plurality of divided chambers, and a water curtain is provided in each of the divided chambers. Provide a water spray member to be formed,
A cutting table for a thermal cutting machine, wherein a dust collecting device is connected to each of the divided chambers, and the table main body is provided with a light preventing plate having a structure that does not block the loading and unloading of the work. 4. An air injection member for forming an air curtain on an upper portion of a table main body, and a suction duct is provided on a side opposite to a position where the air injection member is provided. Cutting table for thermal cutting machine. 5. The cutting table according to claim 1, wherein the light preventing plate is attached to the table body via a hinge. 6. The cutting table for a thermal cutting machine according to claim 5, wherein the light prevention plate is divided into a plurality of sheets, and the divided sections are attached via hinges. 7. A transport member is attached to a part of a light-preventing plate which is tilted to a work supporting member side and maintained horizontal by a hinge on a table body via a hinge. The cutting table for a thermal cutting machine according to 3 or 4.