CN217290880U

CN217290880U - Laser processing device

Info

Publication number: CN217290880U
Application number: CN202220180956.4U
Authority: CN
Inventors: 周志锋; 张意; 李勇
Original assignee: Suzhou Qingyue Optoelectronics Technology Co Ltd
Current assignee: Suzhou Qingyue Optoelectronics Technology Co Ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-08-26
Anticipated expiration: 2032-01-21

Abstract

The utility model provides a laser processing device, include: the protective cover comprises a protective side plate and a protective top plate, and a space surrounded by the protective side plate and the protective top plate is a processing area; a dust adsorption unit located below the protective cover; the carrying platform is positioned in the processing area and is suitable for placing a workpiece to be processed; the laser processing head penetrates through the protective top plate and extends into the processing area, and a light outlet of the laser processing head faces the bearing platform; the first air pipe penetrates through the protective top plate and extends into the processing area, the first air pipe is suitable for introducing air into the processing area, the first air pipe is located on the side portion of the laser processing head, one end, facing the carrying platform, of the first air pipe is connected with an annular nozzle, the distance from the annular nozzle to the carrying platform is smaller than the distance from the laser processing head to the carrying platform, and the annular nozzle is suitable for guiding air flow in the first air pipe to be sprayed to the dust adsorption unit at the bottom of the protective side plate. The fine dust and dust generated in the processing area are brought into the dust adsorption unit, and the cleaning effect of the fine dust and dust in the laser processing device is improved.

Description

Laser processing device

Technical Field

The utility model relates to a laser beam machining technical field, concretely relates to laser beam machining device.

Background

Over 30 years of development, lasers have become ubiquitous. Laser has been widely used in many aspects of life and research due to its high brightness, high directivity, high coherence and high monochromaticity, such as laser welding, laser cutting, laser drilling, laser acupuncture, laser cutting, substrate coding, etc., during the application of these lasers, a large amount of fine dusts and dusts are generated which are scattered at high speed, the current solution is to add a dust suction device below the laser processing head, however, the fine dust and dust splashed at a high speed are generated in the laser processing process, the suction force of the dust suction device is limited, some of the fine dust and dust splashed at a high speed cannot be completely sucked away, so that part of the fine dust and dust flies out of the equipment to affect the health of personnel, and part of the fine dust and dust adheres to the inside of the equipment to contaminate the equipment and a laser processing head, so that the processed products are abnormal, and the equipment needs to be cleaned manually and periodically. Therefore, the laser processing device provided by the prior art needs to further clean the fine dust and dirt in the laser processing process.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the problem that the fines and dust in the laser machining process remain further clearance among the prior art to a laser processing device is provided.

The utility model provides a laser processing device, include: the protective cover comprises a protective side plate and a protective top plate, and a space surrounded by the protective side plate and the protective top plate is a processing area; a dust adsorption unit located below the protective cover; the carrying platform is positioned in the processing area and is suitable for placing a workpiece to be processed; the laser processing head penetrates through the protective top plate and extends into the processing area, and a light outlet of the laser processing head faces the carrying platform; the first air pipe penetrates through the protective top plate and extends into the machining area, the first air pipe is suitable for introducing air into the machining area, the first air pipe is located on the side portion of the laser machining head, one end, facing the carrying platform, of the first air pipe is connected with an annular nozzle, the distance from the annular nozzle to the carrying platform is smaller than the distance from the laser machining head to the carrying platform, and the annular nozzle is suitable for guiding air flow in the first air pipe to be sprayed to the dust adsorption unit at the bottom of the protective side plate.

Optionally, the annular nozzle comprises an annular second nozzle and an annular first nozzle surrounding the second nozzle; the first nozzle comprises a first upper nozzle and a first lower nozzle fixedly connected with the first upper nozzle, the first upper nozzle is positioned on one side, back to the carrying platform, of the first lower nozzle, the first upper nozzle is in a ring-column shape, internal threads are arranged on the inner wall of the first upper nozzle, and the inner diameter of the first lower nozzle increases from top to bottom; the second nozzle comprises a second upper nozzle and a second lower nozzle fixedly connected with the second upper nozzle, the second upper nozzle is positioned on one side, back to the carrying platform, of the second lower nozzle, the second upper nozzle is in an annular column shape, the inner diameter of the second lower nozzle increases from top to bottom, the second upper nozzle is surrounded by the first upper nozzle, the second lower nozzle is surrounded by the first lower nozzle, the second upper nozzle comprises a first area and a second area positioned below the first area, the outer diameter of the first area is larger than that of the second area, and external threads matched with the internal threads are arranged on the surface of the outer wall of the first area; a first air flow passage is provided between an outer wall surface of the second zone to an inner wall surface of the first upper nozzle, and a second air flow passage is provided in the second zone to penetrate through the second zone in a radial direction; a third air flow channel is adapted to be formed between an outer wall surface of the second lower nozzle and an inner wall surface of the first lower nozzle, the third air flow channel being in communication with the first air flow channel, a width of the third air flow channel being adapted to vary with rotation of the second upper nozzle relative to the first upper nozzle; the first air pipe is communicated with the central hole of the second nozzle.

Optionally, an included angle between the outer wall of the second lower nozzle and the inner wall of the second upper nozzle is 30-60 degrees.

Optionally, the first nozzle comprises a stainless steel nozzle and the second nozzle comprises a stainless steel nozzle.

Optionally, the method further includes: run through the protection roof and stretch into the second trachea in processing district, the second trachea is located the lateral part of laser beam machining head, the second trachea be suitable for toward processing district lets in gas so that processing district is the malleation state.

Optionally, the inner diameter of the suction port of the dust adsorption unit decreases from top to bottom, the diameter of the suction port facing the protective top plate is larger than the diameter of the processing area, and the dust adsorption unit is adapted to guide the airflow of the processing area to flow out of the processing area.

Optionally, an inner wall surface of the first lower nozzle is parallel to an opposite outer wall surface of the second lower nozzle.

Optionally, the air flow rate of the dust adsorption unit is greater than the total air flow rate of the first air pipe and the second air pipe.

Optionally, the first air pipe is suitable for introducing compressed air, and the second air pipe is suitable for introducing compressed air.

Optionally, the distance between the first air pipe and the laser processing head is 2cm-5 cm.

The technical scheme of the utility model following beneficial effect has:

1. the utility model provides a laser processing device, first trachea is located the lateral part of laser processing head, first trachea towards the one end of microscope carrier is connected with annular nozzle, and the gas in the first trachea is spouted into the processing district through annular nozzle, the distance of annular nozzle to the microscope carrier is less than the distance of laser processing head to the microscope carrier, and the gas of annular nozzle spun like this is less than laser processing head, can avoid on fine fillings and dust are blown laser processing head neatly in the laser processing process, is favorable to keeping laser processing head clean, annular nozzle is suitable for guide the air current in the first trachea spout to the bottom of protection curb plate dust adsorption unit, through the guide effect of the air current of annular nozzle spun, makes the fine fillings and the dust that the processing district produced be brought into dust adsorption unit under the drive of air current, prevent that fine fillings and dust departure safety cover from influencing the operation personnel healthy, also can avoid fine fillings and dust to adhere to the surface at laser beam machining device simultaneously, be favorable to keeping laser beam machining device clean and tidy, improved the clean effect of fine fillings and dust in the laser beam machining device.

2. Further, the annular nozzle comprises an annular second nozzle and an annular first nozzle surrounding the second nozzle, the outer wall surface of the first area is provided with an external thread matched with the internal thread, the width of the third air flow channel is suitable for changing along with the rotation of the second upper nozzle relative to the first upper nozzle, and the width of the third air flow channel can be adjusted, so that the size and the speed of air flow sprayed to the machining area by the annular nozzle through the third air flow channel can be adjusted, the size and the speed of the air flow can be adjusted according to different machining conditions, and the flexibility of the laser machining device is improved.

3. Further, the first nozzle comprises a stainless steel nozzle and the second nozzle comprises a stainless steel nozzle. The stainless steel has higher compressive strength, can adapt to high-pressure airflow and improves the cleaning effect of fine dust and dust.

4. Further, the second gas pipe is suitable for introducing gas into the processing area so as to enable the processing area to be in a positive pressure state. In the processing process of the laser processing device, part of the fine dust and dust which are not taken away by the air flow sprayed by the annular nozzle can also be discharged into the dust adsorption unit, and the cleaning effect of the fine dust and dust is further improved under the comprehensive action of the air flow sprayed by the second air pipe and the annular nozzle.

5. Furthermore, the inner wall surface of the first lower nozzle is parallel to the opposite outer wall surface of the second lower nozzle, so that the airflow can stably circulate in the third airflow channel, and the airflow sprayed by the annular nozzle is relatively stable.

6. Further, the airflow of dust adsorption unit is greater than first trachea with the tracheal total airflow of second makes holistic air current direction in the processing district towards dust adsorption unit, can avoid fines and dust to remain in the processing district, has further improved the clean effect of fines and dust.

7. Furthermore, the distance between the first air pipe and the laser processing head is 2cm-5cm, the distance between the first air pipe and the laser processing head is relatively short, and meanwhile, the distance between the annular nozzle and the carrying platform is smaller than the distance between the laser processing head and the carrying platform, so that fine scraps and dust can be prevented from being blown onto the laser processing head by air flow sprayed by the annular nozzle in the laser processing process, and the cleanness and tidiness of the laser processing head are favorably kept.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a laser processing apparatus according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural view of an annular nozzle according to an embodiment of the present invention.

Reference numerals are as follows:

1. a protective cover; 11. protecting the side plate; 12. a protective top plate; 1a, a processing area; 2. a dust adsorption unit; 2a, a suction inlet; 3. a stage; 4. a laser processing head; 5. a first air pipe; 6. an annular nozzle; 61. a first nozzle; 611. a first upper nozzle; 612. a first lower nozzle; 62. a second nozzle; 621. a second upper nozzle; 621a, a first area; 621b, a second area; 622. a second lower nozzle; 7. a first air flow passage; 8. a second airflow channel; 9. a third airflow channel; 10. a second air pipe.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

An embodiment of the present invention provides a laser processing apparatus, please refer to fig. 1, including:

the protective cover 1 comprises a protective side plate 11 and a protective top plate 12, and a space surrounded by the protective side plate 11 and the protective top plate 12 is a processing area 1 a;

a dust adsorption unit 2 located below the protective cover 1;

a stage 3 located in the processing area 1a, the stage 3 being adapted to place a workpiece to be processed;

the laser processing head 4 penetrates through the protective top plate 12 and extends into the processing area 1a, and a light outlet of the laser processing head 4 faces the carrying platform 3;

the first air pipe 5 penetrates through the protective top plate 12 and extends into the machining area 1a, the first air pipe 5 is suitable for introducing air into the machining area 1a, the first air pipe 5 is located on the side portion of the laser machining head 4, one end, facing the carrying platform 3, of the first air pipe 5 is connected with an annular nozzle 6, the distance from the annular nozzle 6 to the carrying platform 3 is smaller than the distance from the laser machining head 4 to the carrying platform 3, and the annular nozzle 6 is suitable for guiding air flow in the first air pipe 5 to be sprayed to the dust adsorption unit 2 at the bottom of the protective side plate 11.

In the present embodiment, the outer wall of the side of the annular nozzle 6 facing away from the stage 3 is provided with threads, such as M6, M8, or M10 threads, and the annular nozzle 6 is connected to the first air tube 5 by a threaded connection.

In an embodiment where the annular nozzle 6 is located at a distance of 15cm to 25cm, for example 15cm, 20cm or 25cm, from the carrier 3, the annular nozzle 6 cannot be located too far from the carrier 3, which prevents the cleaning effect on the fine dust and dirt from being affected by the weakening of the air flow emitted by the annular nozzle 6 when the air flow reaches the vicinity of the workpiece to be machined.

In one embodiment, the annular nozzle 6 is located at a distance of 40cm to 60cm, for example, 40cm, 50cm or 60cm, from the dust adsorbing unit 2, and the annular nozzle 6 is not located too close to the dust adsorbing unit 2, so that it is possible to prevent the fine dusts and dusts blown toward the dust adsorbing unit 2 from being splashed into the protecting cover 1 due to an excessively strong air current from the annular nozzle 6.

When the laser processing device is used in practice, compressed gas (CDA) is passed through toward first trachea 5 in the preceding 1 second of laser processing head 4 work, and the compressed gas is under the effect of annular nozzle 6, and it spouts into processing area 1a to be 360 degrees high-speed jet states, and at laser processing head 4 during operation, the compressed gas that is 360 degrees high-speed jet can blow the fines and the dust that the course of working produced to dust absorption unit 2 in, 2 seconds stop ventilating toward first trachea 5 after laser processing head 4 work, be favorable to practicing thrift compressed air.

The gas in the first gas pipe 5 is sprayed into the processing area 1a through the annular nozzle 6, the distance from the annular nozzle 6 to the carrier 3 is smaller than the distance from the laser processing head 4 to the carrier 3, so that the gas sprayed out of the annular nozzle 6 is lower than the distance from the laser processing head 4, fine dust and dust can be prevented from being blown onto the laser processing head 4 in the laser processing process, the cleanness of the laser processing head 4 can be favorably maintained, the annular nozzle 6 is suitable for guiding the gas flow in the first gas pipe 5 to be sprayed to the dust adsorption unit 2 at the bottom of the protection side plate 11, the fine dust and dust generated in the processing area 1a can be brought into the dust adsorption unit 2 under the driving of the gas flow through the guiding effect of the gas flow sprayed out of the annular nozzle 6, the influence on the health of operators by the fine dust and flying dust coming out of the protection cover 1 can be prevented, and the fine dust and dust can be prevented from being adhered to the surface of the laser processing device, the laser processing device is favorable for keeping the laser processing device clean and tidy, the cleaning effect of fine scraps and dust in the laser processing device is improved, and the number of times of cleaning equipment manually at regular intervals is reduced.

Referring to fig. 2, the annular nozzle 6 includes an annular second nozzle 62 and an annular first nozzle 61 surrounding the second nozzle 62. The direction indicated by the arrows in fig. 2 is the direction of the airflow.

The first nozzle 61 includes a first upper nozzle 611 and a first lower nozzle 612 fixedly connected to the first upper nozzle 611, the first upper nozzle 611 is located on a side of the first lower nozzle 612 facing away from the stage 3, the first upper nozzle 611 is in a shape of a circular column, an inner wall of the first upper nozzle 611 is provided with an internal thread, and an inner diameter of the first lower nozzle 612 increases from top to bottom.

The second nozzle 62 includes a second upper nozzle 621 and a second lower nozzle 622 fixedly connected to the second upper nozzle 621, the second upper nozzle 621 is located on a side of the second lower nozzle 622 facing away from the stage 3, the second upper nozzle 621 is in a shape of a circular column, an inner diameter of the second lower nozzle 622 increases from top to bottom, the second upper nozzle 621 is surrounded by the first upper nozzle 611, the second lower nozzle 622 is surrounded by the first lower nozzle 612, the second upper nozzle 621 includes a first area 621a and a second area 621b located below the first area 621a, an outer diameter of the first area 621a is larger than an outer diameter of the second area 621b, and an outer wall surface of the first area 621a is provided with an external thread matched with the internal thread.

A first air flow passage 7 is provided between an outer wall surface of the second region 621b to an inner wall surface of the first upper nozzle 611, and a second air flow passage 8 is provided in the second region 621b to penetrate the second region 621b in a radial direction.

A third air flow passage 9 is adapted to be formed between an outer wall surface of the second lower nozzle 622 and an inner wall surface of the first lower nozzle 612, the third air flow passage 9 is communicated with the first air flow passage 7, and a width of the third air flow passage 9 is adapted to be varied with rotation of the second upper nozzle 621 with respect to the first upper nozzle 611.

Because the width of the third airflow channel 9 can be adjusted, the size and the speed of the airflow which is sprayed to the processing area 1a by the annular nozzle 6 through the third airflow channel 9 can also be adjusted, the size and the speed of the airflow can be adjusted according to different processing conditions, and the flexibility of the laser processing device is improved.

The first air pipe 5 communicates with the center hole of the second nozzle 62.

The inner wall surface of the first lower nozzle 612 is parallel to the opposite outer wall surface of the second lower nozzle 622. The air flow can be smoothly circulated in the third air flow channel 9, and the air flow sprayed out from the annular nozzle 6 is relatively stable.

The angle between the outer wall of the second lower nozzle 622 and the inner wall of the second upper nozzle 621 is 30 degrees to 60 degrees, for example, 30 degrees, 40 degrees, 45 degrees, 50 degrees, or 60 degrees. The angle between the outer wall of the second lower nozzle 622 and the inner wall of the second upper nozzle 621 is set reasonably according to the specific size of each part of the laser processing device, so that the air flow ejected from the annular nozzle 6 can be ensured to blow the fine dust and the dust to the dust adsorption unit 2 without blowing the fine dust and the dust to the protection cover 1.

The first nozzle 61 comprises a stainless steel nozzle and the second nozzle 62 comprises a stainless steel nozzle. The stainless steel has higher compressive strength, can adapt to high-pressure airflow and improves the cleaning effect of fine dust and dust.

With continued reference to fig. 1, the laser processing apparatus further includes: and a second gas pipe 10 penetrating through the top protection plate 12 and extending into the machining area 1a, wherein the second gas pipe 10 is located at a side portion of the laser machining head 4, and the second gas pipe 10 is suitable for introducing gas into the machining area 1a so that the machining area 1a is in a positive pressure state. In the processing process of the laser processing device, part of the fine dust and dust which are not taken away by the air flow sprayed by the annular nozzle 6 can also be discharged into the dust adsorption unit 2, and the cleaning effect of the fine dust and dust is further improved under the comprehensive action of the air flow sprayed by the second air pipe 10 and the annular nozzle 6. It should be noted that, during the operation of the laser processing apparatus, when the laser processing head 4 is operated or not operated, the compressed air is introduced into the second air pipe 10, and when the operation of the laser processing apparatus is stopped, the introduction of the compressed air into the second air pipe 10 is stopped.

The inner diameter of the suction port 2a of the dust adsorption unit 2 decreases from top to bottom, the diameter of the suction port 2a facing the protective top plate 12 is larger than that of the processing area 1a, and the dust adsorption unit 2 is adapted to guide the airflow of the processing area 1a to flow out of the processing area 1 a.

The amount of air flow of the dust adsorbing unit 2 is larger than the total amount of air flow of the first air duct 5 and the second air duct 10. The whole air flow direction in the processing area 1a faces the dust adsorption unit 2, so that the situation that the fine dusts and the dust are remained in the processing area 1a can be avoided, and the cleaning effect of the fine dusts and the dust is further improved.

The first air pipe 5 is adapted to be fed with compressed air and the second air pipe 10 is adapted to be fed with compressed air.

The distance between the first gas tube 5 and the laser processing head 4 is 2cm-5cm, for example 2cm, 3cm, 4cm or 5 cm. The distance between the first air pipe 5 and the laser processing head 4 is relatively short, and meanwhile, the distance between the annular nozzle 6 and the carrying platform 3 is smaller than the distance between the laser processing head 4 and the carrying platform 3, so that fine chips and dust can be prevented from being blown onto the laser processing head 4 by air flow sprayed by the annular nozzle 6 in the laser processing process, and the laser processing head 4 can be kept clean and tidy.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A laser processing apparatus, comprising:

the protective cover comprises a protective side plate and a protective top plate, and a space surrounded by the protective side plate and the protective top plate is a processing area;

a dust adsorption unit located below the protective cover;

the carrying platform is positioned in the processing area and is suitable for placing a workpiece to be processed;

the laser processing head penetrates through the protective top plate and extends into the processing area, and a light outlet of the laser processing head faces the carrying platform;

the first air pipe penetrates through the protective top plate and extends into the machining area, the first air pipe is suitable for introducing air into the machining area, the first air pipe is located on the side portion of the laser machining head, one end, facing the carrying platform, of the first air pipe is connected with an annular nozzle, the distance from the annular nozzle to the carrying platform is smaller than the distance from the laser machining head to the carrying platform, and the annular nozzle is suitable for guiding air flow in the first air pipe to be sprayed to the dust adsorption unit at the bottom of the protective side plate.

2. The laser processing apparatus according to claim 1, wherein the annular nozzle includes an annular second nozzle and an annular first nozzle surrounding the second nozzle;

the first nozzle comprises a first upper nozzle and a first lower nozzle fixedly connected with the first upper nozzle, the first upper nozzle is positioned on one side, back to the carrying platform, of the first lower nozzle, the first upper nozzle is in a ring-column shape, internal threads are arranged on the inner wall of the first upper nozzle, and the inner diameter of the first lower nozzle increases from top to bottom;

the second nozzle comprises a second upper nozzle and a second lower nozzle fixedly connected with the second upper nozzle, the second upper nozzle is positioned on one side, back to the carrying platform, of the second lower nozzle, the second upper nozzle is in an annular column shape, the inner diameter of the second lower nozzle increases from top to bottom, the second upper nozzle is surrounded by the first upper nozzle, the second lower nozzle is surrounded by the first lower nozzle, the second upper nozzle comprises a first area and a second area positioned below the first area, the outer diameter of the first area is larger than that of the second area, and external threads matched with the internal threads are arranged on the surface of the outer wall of the first area;

a first air flow passage is provided between an outer wall surface of the second zone to an inner wall surface of the first upper nozzle, and a second air flow passage is provided in the second zone to penetrate through the second zone in a radial direction;

a third air flow channel is adapted to be formed between an outer wall surface of the second lower nozzle and an inner wall surface of the first lower nozzle, the third air flow channel being in communication with the first air flow channel, a width of the third air flow channel being adapted to vary with rotation of the second upper nozzle relative to the first upper nozzle;

the first air pipe is communicated with the central hole of the second nozzle.

3. The laser processing apparatus according to claim 2, wherein an angle between an outer wall of the second lower nozzle and an inner wall of the second upper nozzle is 30 degrees to 60 degrees.

4. The laser processing apparatus of claim 2, wherein the first nozzle comprises a stainless steel nozzle and the second nozzle comprises a stainless steel nozzle.

5. The laser processing apparatus according to claim 2, further comprising:

run through the protection roof and stretch into the second trachea in processing district, the second trachea is located the lateral part of laser beam machining head, the second trachea be suitable for toward processing district lets in gas so that processing district is the malleation state.

6. The laser processing apparatus according to claim 5, wherein an inner diameter of a suction port of the dust adsorption unit decreases from top to bottom, a diameter of the suction port toward the protective top plate is larger than a diameter of the processing region, and the dust adsorption unit is adapted to guide an airflow of the processing region to flow out of the processing region.

7. The laser processing apparatus according to claim 6, wherein an inner wall surface of the first lower nozzle is parallel to an opposite outer wall surface of the second lower nozzle.

8. The laser processing apparatus according to claim 7, wherein an air flow rate of the dust adsorbing unit is larger than a total air flow rate of the first air pipe and the second air pipe.

9. Laser machining device according to one of the claims 6 to 8, characterized in that the first air duct is adapted to let in compressed air and the second air duct is adapted to let in compressed air.

10. A laser machining apparatus as claimed in claim 1, wherein the spacing between the first gas tube and the laser machining head is 2cm to 5 cm.