JP2580343Y2 - Metal cutting gas exhaust system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for efficiently sucking and exhausting gas generated when cutting a metal plate.

[0002]

2. Description of the Related Art Generally, an NC plasma cutting apparatus 1 is constructed as shown in FIG.
And a cutting platen 2 formed in a mushroom shape as shown in FIG.
The metal plate 3 to be cut is placed on the top, and the cutting torch 10 is moved by NC control to cut into a desired shape. When cutting is performed by this plasma, the metal plate 3 is heated to a high temperature, so that the cutting gas (fume) is directed downward from the cut surface.
4, a box-shaped smoke collecting frame 5 is provided below the cutting platen 2.
The air is exhausted to the outside after being treated by a dust collector 9 through a duct 8 from an exhaust port 7 provided in a side wall 6 of the smoke collecting frame 5.

A cutting method using the NC plasma cutting apparatus 1 is as follows. First, a large metal plate is placed on a cutting platen 2 in which strip-shaped iron plates are arranged upright at intervals and formed in the shape of a saw, and an opening penetrating vertically is formed. The plate 3 is placed and cut into a desired shape while moving the cutting torch 10 in the X and Y directions by NC control from the end side of the metal plate 3, and the cut metal plates 3 are taken out one by one. The size of the cutting platen 2 is, for example, 2 m in length,
The smoke collecting frame 5 is formed so as to maximize the cutting ability of about 3 m in width, and has a structure in which the lower part of the cutting surface plate 2 is surrounded by a large box-shaped frame.

[0004] When cutting a large metal plate 3 that covers the entire cutting platen 2, the cutting gas 4 is suctioned from the exhaust port 7 because the upper part of the box-shaped smoke collecting frame 5 is initially covered. Being leaked into the workplace. However, when the metal plates 3 cut into small pieces having a desired shape are taken out one by one, the cutting platen 2 is gradually exposed and the opening becomes wider, and the cutting gas 4 bounced off the bottom surface of the smoke collecting frame 5 is removed by a snowboard. There is a problem that the working environment is deteriorated by leaking into the work place through the opening. In particular, when cutting from a small metal plate 3, there is a problem that a large amount of the cutting gas 4 leaks because the cutting platen 2 is exposed from the beginning. There is also a problem that the cutting gas 4 or dross reflected on the bottom surface of the smoke collecting frame 5 rebounds and leaks outside, or the dross adheres to the cut metal plate 3 as a product.

In order to improve this, a dust collector 9 having a large capacity is used.
, The cutting gas 4 ejected into the smoke collecting frame 5 is reliably sucked to prevent the gas from leaking into the working environment, and the dust-collected gas is discharged outside. However, this requires the installation of a large-sized dust collector 9, which increases equipment costs. At present, only a part of the generated cutting gas 4 is processed. Some companies are concerned about the installation or expansion of the NC plasma cutting device due to such environmental problems caused by the cutting gas 4, and this measure has been desired.

[0006]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, and even when the metal plate to be cut is small, efficiently sucks the cutting gas with a small-capacity dust collector to reduce leakage to the working environment. It is an object of the present invention to provide a metal cutting gas exhaust device in which a dross is prevented from rebounding and is prevented from adhering to a cut metal plate.

[0007]

According to a first aspect of the present invention, there is provided a metal cutting gas exhaust device, wherein a smoke collecting frame is provided below a cutting platen having an opening penetrating vertically. It is divided into a plurality of blocks, and the inner wall of each divided block is formed narrower from the upper opening toward the bottom side, and a gap is provided between the inner wall and the upper side of the bottom side to form an inverted V-shaped cross section. A rectifying plate also serving as a reflecting plate is attached, an exhaust port is formed below the rectifying plate, the exhaust port is connected to a dust collector via a duct, a damper is attached to the exhaust port or the duct, and a cut platen is provided. A detection mechanism is provided for detecting the position of the cutting torch moving upward in the XY directions and opening and closing the dampers attached to the blocks facing the lower part.

[0008]

The operation of the invention according to the first aspect of the present invention is as follows. When the cutting device is operated by placing the metal plate on a cutting surface plate having an opening formed vertically therethrough, the cutting torch moves thereon. And cut into the desired shape. At this time, if the cutting torch is positioned on one of the divided blocks, a damper communicating with the block below this is opened, and the block where the cutting torch is positioned by the dust collector is opened. Only the inside is sucked, and leakage of the cutting gas to the working environment can be reduced.

Further, in this case, when the metal plate is cut by the cutting torch, the cutting gas or dross generated at this time is jetted downward into the smoke collecting frame, but the inner wall of each block is opened from the upper opening. Since it is formed narrower toward the bottom side, it flows along this, and further flows to the bottom side through a narrow gap between the straightening plate having an inverted V-shaped cross section and the inner wall, so that cutting gas and dross can be efficiently discharged. Can be aspirated. In addition, a rectifying plate that also functions as a reflector having an inverted V-shaped cross section is provided above the bottom surface side of the smoke collecting frame. Then, the gas is reflected downward and captured on the bottom surface side, so that the cutting gas and dross can be more efficiently sucked.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. The NC plasma cutting apparatus 1 is shown in FIG.
As shown in FIG. 1, a Y-direction guide rail 13 is movably provided on an X-direction guide rail 12, and the cutting torch 10 can move along the Y-direction guide rail 13. The cutting platen 2 has a structure in which strip-shaped iron plates are erected at intervals and arranged in the shape of a saw to form an opening that penetrates vertically, and has a box-like shape having an upper part opened below the cutting platen 2. A smoke collection frame 5 is provided. This smoke collecting frame 5 is divided into three blocks 15a, 15b and 15c. The four inner walls 16 forming each of the three divided blocks 15a, 15b, 15c are formed so as to be narrower from the upper opening toward the bottom side, and a concave groove 17 is formed in the bottom along the longitudinal direction. I have. Further, a flow straightening plate 19 having an inverted V-shaped cross section is mounted above the concave groove 17 with a gap 18 provided between the left and right inner side walls 16 and 16.

Further, the concave groove 17 of each block 15a, 15b, 15c
3 communicates with ducts 8a, 8b, 8c branched through an exhaust port 7 provided on the side wall 6 of the smoke collecting frame 5, as shown in FIG.
a, 20b and 20c are attached. This duct 8a,
8b and 8c are connected to a dust collector 9 via a duct 8 as shown in FIG.

As shown in FIGS. 4 and 5, the dampers 20a, 20b, and 20c are arranged such that the center of a circular shutter plate 21 is an axis.
The ends of air cylinders 24a, 24b, 24c are rotatably connected to the shaft 22 via an arm 23. Further, solenoid valves 25a, 25b, 25c are connected to the air cylinders 24a, 24b, 24c so that air supplied from the air pipe 26 to the air cylinders 24a, 24b, 24c is opened and closed.

As shown in FIG. 2, on the side of the X-direction guide rail 12 facing the cutting surface plate 2, there are three pieces slightly longer than the X-direction length of each block 15a, 15b, 15c of the smoke collecting frame 5. The switch operating plates 30a, 30b, 30c of the respective blocks 15a, 15b,
It is mounted facing the side of 15c. Three limit switches 31a, 31b, 31c are mounted on the lower surface of the Y-direction guide rail 13, as shown in FIG. 3, corresponding to the switch operation plates 30a, 30b, 30c further shifted.

The limit switches 31a, 31b, 31
As shown in FIG. 6, the control circuit for the c and the dampers 20a, 20b, 20c has a limit switch 31a, 31b, 31c connected in parallel to a power supply 32, and furthermore, the limit switch 31a,
Solenoid valves 25a, 25b, 25c are connected in series to 31b, 31c, respectively. The solenoid valves 25a, 25b, 25c are connected to the air supply source 33, respectively, and the switch actuation plates 30a, 30b, 30c
When the limit switches 31a, 31b, 31c corresponding to are turned on, the solenoid valves 25a, 25b, 25c connected thereto are operated to supply air from the air supply source 33 through the air pipe 26, and the air cylinders 24a, 24b, 24c operates, and the shutter plate 21 rotates.

The operation of cutting the metal plate 3 by the NC plasma cutting device 1 while exhausting the cutting gas 4 by the exhaust device having the above structure will be described. First, as shown in FIG. 1, a metal plate 3 is placed on a cutting board 2 in the shape of a saw. Next, when the NC plasma cutting apparatus 1 is operated, the Y-direction guide rail 13 moves on the X-direction guide rail 12 in accordance with a program, and the cutting torch 10 moves on the X-direction guide rail 12 in the Y direction to cut into a desired shape. .

At this time, assuming that the cutting torch 10 is located above the block 15c, only the limit switch 31c mounted on the bottom surface of the Y-direction guide rail 13 has a switch operating plate.
Touching the limit switch 31 as shown in FIG.
c is turned on, the power is supplied from the power supply 32, the solenoid valve 25c is operated, and air is supplied from the air pipe 26 to the air cylinder 24c. As a result, when the cylinder rod extends,
The shaft 22 rotates through the arm 23 and the shutter plate 21
And the duct 8c is opened, and the cutting gas 4 in the block 15c is sucked by the dust collector 9.

When the metal plate 3 is cut by the plasma of the cutting torch 10, the cutting gas 4 and dross generated at this time are ejected downward, but as shown in FIG. Is formed narrower from the bottom toward the bottom side, and a straightening plate 19 having an inverted V-shaped cross section is provided in the middle and sucked by the dust collector 9, so that the cutting gas 4 and the dross are formed along the inner side walls 16 and the straightening plate 19. Is guided through the narrow gap 18 and falls into the concave groove 17, but since the gap 18 is narrow, the flow velocity of the gas passing downward through the gap 18 is increased and the gas is efficiently sucked.

Further, the cutting gas 4 and the dross reflected and bounced off the bottom surface of the concave groove 17 of the block 15c have a straightening plate 19 formed in an inverted V-shaped cross section, and the bottom surface also serves as a reflecting plate. The cutting gas 4 and the dross once reflected in the groove 17 and once flowed into the concave groove 17 are collected here and do not rise from the gap 18. At this time, the dampers 20a of the blocks 15a and 15b,
20b is closed, so the dust collector 9 narrows the block 15c
Only inside is sucked.

When the cutting torch 10 moves from above the block 15c to the metal plate 3 above the adjacent block 15b,
In the vicinity of the boundary, as shown in FIG.
30c is mounted on top of the limit switch 31b
Also, the shutter plate 21 of the damper 20b rotates in contact with the switch operation plate 30b and turns on.
Both 15b and 15c are sucked by the dust collector 9.

When the metal plate 3 on the block 15c is cut into a predetermined shape in this way, it is removed from the cutting platen 2. Thereafter, the cutting torch 10 is moved to the middle block 15b.
When the cutting operation of the metal plate 3 in this part is started, the limit switch 31c is separated from the switch operation plate 30c and turned off, and the solenoid valve 25c is switched to switch the air cylinder 24.
c, the cylinder rod contracts and the damper 20c closes,
The suction in the block 15c stops. Block 15a,
Since the inner side walls 16 of 15b, 15c are formed narrower from the upper opening toward the bottom side, dross generated at the time of cutting is collected in the concave groove 17 and can be easily cleaned and removed.

In the above embodiment, the case where the smoke collecting frame 5 is divided into three blocks 15a, 15b and 15c has been described. However, the present invention is not limited to this. . Further, the position of the cutting torch 10 is detected and a damper 20 communicating with the corresponding blocks 15a, 15b, 15c is provided.
The mechanism for opening and closing a, 20b and 20c is a limit switch 31.
The dampers 20a, 20b, and 20c are directly operated from the position of the cutting torch 10 by incorporating the program into the NC plasma cutting apparatus 1 without being limited to the structure in which the a, 31b, and 31c contact the switch operating plates 30a, 30b, and 30c. You may make it do. In the above-described embodiment, the case where the present invention is applied to the NC plasma cutting apparatus is described. However, the present invention can be widely applied to a laser cutting apparatus, a gas cutting apparatus, or the like that generates a cutting gas when cutting a metal plate.

[0022]

As described above, according to the metal cutting gas exhaust device of the present invention, the smoke collection frame surrounding the lower part of the cutting platen is divided into a plurality of blocks, and the divided blocks are provided with exhaust ports respectively. However, each of the dampers communicating with this exhaust port is provided, and only the inside of the block where the cutting torch is located is suctioned by the dust collector, so that even when the metal plate to be cut is small, the cutting gas can be efficiently removed by the dust collector having a small capacity. Suction can reduce leakage to the working environment.

Further, the cutting gas or dross reflected and bounced off at the bottom surface of the block is reflected downward at the bottom surface since the straightening plate is formed in an inverted V-shaped cross section and this bottom surface also serves as a reflection plate. The cutting gas and dross once flowing into the bottom are collected here and do not rise from the gap, thereby preventing adhesion to the cut metal plate, and making it easy to clean and remove the dross collected at the bottom.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a metal cutting gas exhaust device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the metal cutting gas exhaust device of FIG.

FIG. 3 is a vertical sectional side view showing the metal cutting gas exhaust device of FIG. 2;

FIG. 4 is a cross-sectional plan view showing a state where the damper of FIG. 2 is closed.

FIG. 5 is a cross-sectional plan view showing a state where the damper of FIG. 4 is open.

FIG. 6 is a circuit diagram showing a control circuit for a limit switch and a damper.

FIG. 7 is a plan view showing a conventional metal cutting gas exhaust device.

FIG. 8 is a vertical sectional front view showing the metal cutting gas exhaust device of FIG. 7;

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 NC plasma cutting device 2 Cutting surface plate 3 Metal plate 4 Cutting gas 5 Smoke collecting frame 7 Exhaust port 8 Duct 9 Dust collector 10 Cutting torch 12 X direction guide rail 13 Y direction guide rail 15 a block 15 b block 15 c block 16 inner wall 17 concave Groove 20a Damper 21a Air cylinder 25a Solenoid valve 30a Switch operation plate 31a Limit switch

Claims (1)

(57) [Scope of request for utility model registration] 1. A smoke collection frame is provided below a cutting platen having an opening penetrating vertically, and the smoke collection frame is divided into a plurality of blocks .
From the bottom to the bottom side.
With a gap between the inner wall and the reflector, the reflector having an inverted V-shaped cross section
Attach a rectifying plate that also serves as
Formed, with connecting the exhaust port to the dust collector through a duct, fitted with a damper to the exhaust port or duct, and the upper switching assertion board to detect the position of the cutting torch to move in X-Y direction the A metal cutting gas exhaust device provided with a detection mechanism for opening and closing the damper attached to each block facing downward.