CN216151447U - Air draft system of laser cutting machine - Google Patents

Abstract

The invention discloses an air draft system of a laser cutting machine, which comprises two air draft air ducts, a cross beam and a vertical plate, wherein the air draft air ducts are symmetrically arranged, a plurality of dust suction ports are formed in the air draft air ducts, each air door mechanism is driven by an air cylinder, an air pipe is connected onto the air cylinder, each air pipe routing structure comprises an air pipe through hole formed in the upper surface of the air draft air duct and a first pipe passing port and a second pipe passing port formed in the vertical plate, and the first pipe passing port and the second pipe passing port are communicated with each other. The air draft system skillfully utilizes the internal space of the vertical plate for wiring, so that the connecting pipes of the air cylinders do not need to be exposed and arranged at the top of the air draft air duct in a long distance, the connecting length and the exposed area of the air pipes are reduced, the air pipes between the air pipe through holes and the first pipe through holes can be covered and protected in an all-around manner by the protective shell, and the situation that the air pipes between the air pipe through holes and the first pipe through holes are scalded by molten slag is avoided.

Description

Air draft system of laser cutting machine

Technical Field

The invention relates to the field of laser cutting machine manufacturing, in particular to an air draft system of a laser cutting machine.

Background

With the rapid development of cutting technology, laser cutting machines are used in various industries as a novel plate processing tool, which is more and more mature. The laser cutting is to focus the laser emitted from the laser assembly into a laser beam with high power density through an optical path system. The laser beam irradiates the surface of the workpiece to make the workpiece reach a melting point or a boiling point, and simultaneously, the high-pressure gas coaxial with the laser beam blows away the molten or gasified metal. And finally, the material is cut along with the movement of the relative position of the light beam and the workpiece, so that the cutting purpose is achieved. In dull and stereotyped laser cutting machine, but main lathe bed top is provided with horizontal migration's laser cutting head, because laser cutting head can produce a large amount of smoke and dust when the cutting, the smoke and dust pollutes workshop environment, and operating personnel can arouse the infection of respiratory track after working for a long time and inhales a large amount of smoke and dust, endangers the healthy of people, so need set up convulsions dust removal structure on the lathe.

The existing air draft dust removal structure mainly comprises an air draft air duct arranged on the body of the laser cutting machine and a plurality of air door mechanisms arranged on the air draft air duct, wherein the air door mechanisms mainly utilize air cylinders as driving force and control air door plates to open or close air duct openings through the extension and retraction of piston rods of the air cylinders. The cylinder sets up in convulsions wind channel, when the cylinder carries out gas circuit control, need connect the intake pipe at the air inlet of cylinder, connects the muffler at the return-air inlet of cylinder to satisfy the gas circuit action demand, intake pipe and accumulator need draw forth to the outside in convulsions wind channel, and be connected with air feeder through the switching-over valve. See fig. 15 and show, laser cutting machine's lathe bed mainly includes convulsions wind channel 1' that two symmetries set up, a plurality of crossbeam 3 'of setting between two convulsions wind channels, two erect plate 4' of being connected with the outside in convulsions wind channel respectively, and current trachea 2 'is generally drawn forth from the top in convulsions wind channel 1' when walking the line, then place the upper surface in convulsions wind channel and arrange to the tip of lathe bed along the length direction in convulsions wind channel, thereby make the trachea expose around laser cutting machining district, in the panel course of working, laser cutting panel can cause a large amount of molten metal to splash, there is the slag to scald the tracheal condition of breaing and takes place, thereby influence the normal action of cylinder.

It is seen that improvements and enhancements to the prior art are needed.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide the air draft system of the laser cutting machine, which aims to reasonably arrange and route air pipes, protect the exposed air pipes by using a protective shell and avoid the air pipes from being scalded by molten slag.

In order to achieve the purpose, the invention adopts the following technical scheme:

an air draft system of a laser cutting machine comprises two symmetrically arranged air draft air ducts and a cross beam connecting the two air draft air ducts, a plurality of dust suction ports are arranged on the air draft duct, each dust suction port is provided with an air door mechanism for controlling the opening or closing of the dust suction port, the air draft air channel is connected with an air draft fan, each air door mechanism is driven by an air cylinder, the air cylinder is connected with an air pipe, the air pipe is led out of the laser cutting machine through a corresponding air pipe routing structure, each air pipe routing structure comprises an air pipe through hole arranged on the upper surface of the air draft air channel and a first pipe passing hole and a second pipe passing hole arranged on the vertical plate, the first pipe passing port and the second pipe passing port are communicated with each other, the first pipe passing port is positioned on the inner end face of the vertical plate, and the second pipe passing port is positioned on the outer end face of the vertical plate; the trachea passes trachea via hole, first pipe mouth and second in proper order and realizes walking the line, the top in convulsions wind channel is equipped with the protective housing, the protective housing is used for protecting the trachea between trachea via hole and the first pipe mouth.

The vertical plate comprises an upper top plate, a lower bottom plate, an inner end plate, an outer end plate, a left side plate and a right side plate, a wiring cavity is formed inside the vertical plate, the first pipe passing opening is formed in the inner end plate, and the second pipe passing opening is formed in the outer end plate.

The protective housing is including having lower opening and the open-ended shell main part in back, be equipped with on the shell main part with erect the installation ear that the plate can dismantle the connection.

Each mounting lug is provided with a vertically extending waist-shaped hole, the vertical plate is provided with a threaded hole corresponding to the waist-shaped hole, and each waist-shaped hole is provided with an adjusting screw which is connected with the corresponding threaded hole.

The air door mechanism comprises a dust collection opening formed in the air draft air duct, a door frame fixed on the edge of the dust collection opening, and an air door plate capable of swinging up and down relative to the door frame to open and close the dust collection opening, the air cylinder is arranged beside the door frame, and the air cylinder drives the air door plate to swing through the transmission assembly.

The top of the wind door plate is connected with the door frame through an elastic hinge, the transmission assembly comprises a support arranged at the output end of the direct driver, a push wheel rotatably arranged on one side of the support and a guide block obliquely arranged on the side part of the wind door plate, a guide groove is formed in the guide block, and the push wheel is in sliding connection with the guide groove in the guide block.

The wind door plate comprises a wind door plate main body and wing plates which are arranged on the left side and the right side of the wind door plate main body and turn over towards the inside of the air draft air duct, the guide block comprises two guide oblique sheets which are parallel to each other and a connecting sheet for connecting the two guide oblique sheets, the two guide oblique sheets and the connecting sheet are enclosed to form the guide groove, and the connecting sheet is fixed on the corresponding wing plate.

The exhaust air duct is internally provided with a support plate, the air cylinder is vertically installed on the support plate upwards, an inverted U-shaped dustproof side plate is arranged between the support and the end part of the piston rod of the air cylinder, the air cylinder is provided with a dustproof panel parallel to the support plate, and the support plate, the dustproof side plate and the dustproof panel can be enclosed into a dustproof cavity for protecting the piston rod of the air cylinder.

The door frame is provided with a filter screen, and the filter screen is fixed on the door frame through a pressing plate.

And a support rib plate is arranged between the upper top plate and the lower bottom plate, and the suction openings of the two suction air channels are connected with the same suction fan through a pipeline.

Has the advantages that:

compared with the prior art, the air draft system of the laser cutting machine skillfully utilizes the internal space of the vertical plate for wiring, so that the air pipes of the air cylinder do not need to be exposed and arranged at the top of the air draft air channel for a long distance, the connection length and the exposed area of the air pipes are reduced, the air pipes between the air pipe through holes and the first pipe passing openings can be covered and protected in an all-around manner by the protective shell, the situation that the air pipes between the air pipe through holes and the first pipe passing openings are scalded by molten slag is avoided, and the use effectiveness of the air cylinder is ensured.

Drawings

Fig. 1 is a first perspective view of an air draft system of the laser cutting machine provided by the invention.

Fig. 2 is a partially enlarged view of the area a in fig. 1.

Fig. 3 is a perspective view of the protective case.

Fig. 4 is a schematic diagram of the trachea routing.

Fig. 5 is a partially enlarged view of the region C in fig. 4.

Fig. 6 is a second perspective view of the air draft system of the laser cutting machine according to the present invention.

Fig. 7 is a schematic view of the structure of the erected panel, with the outer end panel hidden.

Fig. 8 is a partially enlarged view of the region B in fig. 1.

Fig. 9 is a first schematic view illustrating the assembly of the door frame and the wind door plate.

Fig. 10 is a second schematic view illustrating the assembly of the door frame and the wind door panel.

Fig. 11 is a first structural schematic diagram of the damper mechanism, in which the air cylinder is arranged on the right side of the damper plate.

Fig. 12 is a partially enlarged view of a region D in fig. 11.

Fig. 13 is a second structural schematic diagram of the damper mechanism, in which the air cylinder is disposed on the left side of the damper plate.

FIG. 14 is a schematic view of the mounting of the cylinder on the support plate.

Fig. 15 is a schematic diagram of the arrangement of the conventional trachea on the laser cutting machine.

Description of the main element symbols: 1-air draft duct, 10-cross beam, 2-vertical plate, 21-upper top plate, 22-lower bottom plate, 23-inner end plate, 24-outer end plate, 25-left side plate, 26-right side plate, 27-supporting rib plate, 3-air pipe through hole, 4-first pipe passing hole, 5-second pipe passing hole, 6-protective shell, 61-shell main body, 611-upper plate, 612-front plate, 613-left plate, 614-right plate, 62-mounting lug, 621-waist-shaped hole, 622-threaded hole, 8-air door mechanism, 81-dust collection port, 82-door frame, 83-air door plate, 831-air door plate main body, 832-wing plate, 88-elastic hinge, 84-transmission component, 841-support, 842-push wheel, 843-guide block, 8431-guide oblique sheet, 8432-connecting sheet, 844-guide groove, 851-support plate, 852-dustproof side plate, 8521-horizontal cover, 8522-sliding side part, 853-dustproof panel, 91-filter screen, 92-air suction opening and 93-pressing plate.

Detailed Description

The invention provides an air draft system of a laser cutting machine, which is further described in detail below by referring to the attached drawings and embodiments in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.

Referring to fig. 1-14, the present invention provides an air exhaust system of a laser cutting machine, including two symmetrically arranged air exhaust ducts 1, a cross beam 10 connecting the two air exhaust ducts 1, and a vertical plate 2 connected to an outer end surface of the air exhaust duct 1, wherein the air exhaust duct 1 is provided with a plurality of dust suction ports 81, each dust suction port 81 is provided with an air door mechanism 8 for controlling the opening or closing of the dust suction port 81, the air exhaust duct 1 is connected with an air extractor, each air door mechanism 8 is driven by an air cylinder, the air cylinder is connected with an air pipe, the air pipe is led out of the laser cutting machine through a corresponding air pipe routing structure, each air pipe routing structure includes an air pipe through hole 3 arranged on an upper surface of the air exhaust duct 1 and a first pipe passing port 4 and a second pipe passing port 5 arranged on the vertical plate 2, the first pipe passing port 4 and the second pipe passing port 5 are communicated with each other, the first pipe passing opening 4 is positioned on the inner end face of the vertical plate 2, and the second pipe passing opening 5 is positioned on the outer end face of the vertical plate 2; trachea 87 passes trachea via hole 3 in proper order, firstly crosses mouth of pipe 4 and second and crosses mouth of pipe 5 and realize walking the line, the top in convulsions wind channel 1 is equipped with protective housing 6, protective housing 6 is used for protecting trachea via hole 3 and the first trachea 87 of crossing between the mouth of pipe 4.

In practical application, the top of the vertical plate 2 is provided with a guide rail extending along the length direction thereof, and the laser assembly can slide in cooperation with the guide rail. The number and the positions of the air pipe routing structures can be adapted according to the number and the positions of the air door mechanisms 8, in general, one air door mechanism 8 corresponds to one air pipe routing structure, and the air pipe routing structures are arranged beside the air cylinder 86; of course, the cylinder connecting pipes in the two damper mechanisms 8 can also share one air pipe wiring structure. In order to meet the air path control of the air cylinders 86, an air inlet of each air cylinder 86 is connected with an air inlet pipe, an air return port of each air cylinder 86 is connected with an air return pipe, and then the air inlet pipes and the air return pipes sequentially penetrate through the air pipe through holes 3, the first pipe passing holes 4 and the second pipe passing holes 5 to realize wiring arrangement; the air inlet pipe and the air return pipe can reach the outside of the laser cutting machine after being led out of the second pipe passing opening 5, and are connected with air supply equipment through a reversing valve. Compared with the prior art, the air draft system skillfully utilizes the internal space of the vertical plate 2 for wiring, so that the air pipes do not need to be exposed and arranged at the top of the air draft air duct 1 for a long distance, the connection length and the exposed area of the air pipes are reduced, the air pipes between the air pipe through holes 3 and the first pipe passing holes 4 can be comprehensively covered and protected by the protective shell 6, the condition that the air pipes between the air pipe through holes 3 and the first pipe passing holes 4 are scalded by molten slag is avoided, and the use effectiveness of the air cylinder is ensured.

Specifically, referring to fig. 4-7, the vertical plate 2 includes a top plate 21, a bottom plate 22, an inner end plate 23, an outer end plate 24, a left side plate 25, and a right side plate 26, a wiring cavity is formed inside the vertical plate 2, the first pipe passing opening 4 is disposed on the inner end plate 23, and the second pipe passing opening 5 is disposed on the outer end plate 24, that is, the air pipe 87 passes through the first pipe passing opening 4, enters the wiring cavity 28, and then passes through the second pipe passing opening 5 and is led out to the outside of the laser cutting machine.

Further, a support rib 27 is provided between the upper top plate 21 and the lower bottom plate 22. The supporting rib plate 27 can improve the overall structural strength of the vertical plate 2, so that the vertical plate 2 can better support the laser component, and it should be noted that the supporting rib plate 27 does not affect the routing of the trachea.

Specifically, referring to fig. 2 and 3, the protective shell 6 includes a shell main body 61 having a lower opening and a rear opening, and the shell main body 61 is provided with a mounting ear 62 detachably connected to the vertical plate 2. It can be understood that the lower open is towards trachea via hole 3, and the first mouth of pipe 4 of crossing of back open orientation when initially arranging trachea 87, need dismantle protective housing 6 to trachea 87 walk the line, treat trachea 87 and arrange the completion back, adorn protective housing 6 again.

Further, the housing main body 61 includes an upper plate body 611, a front plate body 612, a left plate body 613, and a right plate body 614, the upper plate body 611, the front plate body 612, the left plate body 613, and the right plate body 614 enclose a rectangular parallelepiped, and the left plate body 613 and the right plate body 614 are respectively connected to one of the mounting ears 62. In the actual processing of the case main body 61, the upper plate body 611, the front plate body 612, the left plate body 613, the right plate body 614, and the mounting lugs 62 are formed by bending a sheet metal, and therefore, the case main body can be easily manufactured without being spliced.

For better protection effect, fine slag cannot penetrate through a gap between the protective shell 6 and the air draft air duct 1 to be in contact with an air pipe; therefore, a vertically extending waist-shaped hole 621 is formed on each of the mounting ears 62, a threaded hole 622 corresponding to the waist-shaped hole 621 is formed on the vertical plate 2, an adjusting screw (not shown) is mounted at each waist-shaped hole 621 and connected with the corresponding threaded hole 622. During the adjustment, loosen adjusting screw, press the 6 bottom edges of protective housing and paste on the upper surface 11 in convulsions wind channel 1, guarantee in the unable inner chamber that gets into protective housing 6 of slag, then it can to tighten adjusting screw again.

In this embodiment, the damper mechanism 8 includes the dust absorption opening 81 opened on the draft air duct 1, the door frame 82 fixed on the edge of the dust absorption opening 81, and the damper plate 83 which can swing up and down relative to the door frame 82 to open and close the dust absorption opening 81, the cylinder 86 is disposed on the side (left side/right side) of the door frame 82, and the cylinder 86 drives the damper plate 83 to swing through the transmission assembly 84. It will be appreciated that the cylinder 86 is disposed on either the left or right side of the door frame 82 depending on the actual assembly requirements.

In prior art, the cylinder generally sets up the rear at door plant 83, and the tailpiece of the piston rod portion of cylinder is connected with door plant 83, and the wind channel mouth is opened or closed with the withdrawal control exhaust duct shrouding through the extension of cylinder piston rod, and after the smoke and dust got into exhaust duct 1, the smoke and dust led to the fact the straight face to strike the cylinder easily, and the inside that the smoke and dust got into the cylinder easily weares and teares inside the cylinder, perhaps blocks the motion of piston rod to influence the life and the working property of cylinder. Compared with the prior art, the air door mechanism provided by the invention has the advantages that the air cylinder is arranged on the left side/right side of the door frame 82, the air cylinder 86 drives the air door plate 83 to swing through the transmission component 84, and the linear kinetic energy output by the air cylinder 86 is skillfully converted into the swing kinetic energy of the air door plate 83 through the transmission component 84, so that a dust inlet opening is formed between the air door plate 83 and the door frame 82; because the dust inlet opening sets up the below at the cylinder, the cylinder 86 that is located door frame 82 both sides is difficult to directly blow to after the smoke and dust gets into convulsions wind channel 1 through the dust inlet opening to it is attached to on the cylinder 86 to reduce the smoke and dust, reduces the working property that the smoke and dust caused the influence to the cylinder.

Furthermore, the top of the wind door panel 83 is connected with the door frame 82 through the elastic hinge 88, and the elastic hinge 88 provides an elastic force to the wind door panel 83, so that the bottom end of the wind door panel 83 tends to swing towards the door frame 82, and the wind door panel 83 is tightly combined with the door frame 82 in a non-working state. Dust absorption mouth 81 is when opening, and the dust inlet opening that door plant 83 and door frame 82 formed is down, compares the dust inlet opening and sets up upwards, and the smoke and dust subsides more easily in the bottom surface in convulsions wind channel 1, can not float and cross the setting height of cylinder to reduce the smoke and dust and adhere to on the cylinder.

Further, referring to fig. 11 and 14, the transmission assembly 84 includes a support 841 disposed at the output end of the direct driver, a push wheel 842 rotatably disposed at one side of the support 841, and a guide block 843 disposed at the side of the inclined flap 83, wherein the guide block 843 is provided with a guide groove 844, and the push wheel 842 is slidably connected with the guide groove 844 of the guide block 843. When the cylinder 86 drives the support 841 and the push wheel 842 arranged on the support 841 to move vertically upwards, the push wheel 842 in the guide groove 844 drives the guide block 843 and the air flap plate 83 to turn upwards, and the contact point between the push wheel 842 and the guide groove 844 of the guide block 843 is changed constantly in the turning process, and the friction force formed by the push wheel 842 and the guide groove 844 is converted into the self-rotating force of the push wheel 842 due to the rotation of the push wheel 842, so that the guide block 843 is not interfered to turn smoothly. The transmission component 84 ingeniously converts the linear kinetic energy output by the cylinder into the swing kinetic energy of the air door plate 83, and the transmission component is small in number of integral parts and convenient to process and assemble.

Preferably, the support 841 is an L-shaped structure, a flat plate portion of the support 841 is connected with an output end of the cylinder, and the push wheel 842 is rotatably connected with a vertical plate portion of the support 841.

Preferably, referring to fig. 9 and 12, the wind plate 83 includes a wind plate main body 831, and wing plates 832 arranged on left and right sides of the wind plate main body 831 and folded toward the interior of the ventilation air duct 1, and the wind plate main body 831 and the wing plates 832 are integrally formed by a metal plate. The guide block 843 comprises two guide inclined pieces 8431 which are parallel to each other and a connecting piece 8432 which connects the two guide inclined pieces 8431, the two guide inclined pieces 8431 and the connecting piece 8432 enclose the guide groove 844, the distance between the two guide inclined pieces 8431 is greater than the diameter of the push wheel 842, the push wheel 842 can be ensured to move flexibly in the guide groove 844, and the connecting piece 8432 is fixed on the corresponding wing plate 832 through screws.

Preferably, a support plate 851 is arranged in the draft duct 1, the cylinder 86 is vertically installed upwards on the support plate 851, the front end face of the cylinder body is tightly attached to the support plate 851, a dustproof panel 853 parallel to the support plate 851 is arranged on the rear end face of the cylinder body, an inverted U-shaped dustproof side plate 852 is arranged between the support 841 and the piston rod of the cylinder, that is, the dustproof side plate 852 comprises a horizontal cover 8521 and sliding side parts 8522 downwards arranged at two ends of the horizontal cover 8521, and the sliding side parts 8522 tightly abut against the side face of the cylinder body. In a normal state, the support plate 851, the dust-proof side plate 852 and the dust-proof panel 853 can enclose a dust-proof cavity for protecting a piston rod of the cylinder. Because the height of the upper edges of the support plate 851 and the dustproof panel 853 is higher than the maximum movable height of the horizontal cover 8521, even if the piston rod of the cylinder extends out, the sliding side part 8522 of the dustproof side plate 852 is driven to ascend relative to the cylinder body and still abut against the side surface of the cylinder body, so the support plate 851, the dustproof side plate 852 and the dustproof panel 853 can enclose a dustproof cavity for protecting the piston rod of the cylinder, smoke is prevented from entering the inside of the cylinder to wear the inside of the cylinder, or the movement of the piston rod is blocked, and the service life and the working performance of the cylinder are guaranteed.

It should be noted that the air cylinder is specifically a single-rod air cylinder, a double-rod air cylinder, a three-rod air cylinder, and the like, and in order to ensure that the output thrust of the air cylinder is sufficient, the air cylinder is preferably a three-rod air cylinder.

Referring to fig. 8, in order to prevent the blockage of the air draft duct 1 caused by the fact that the cutting causes the large iron slag and the waste material to enter the air draft duct 1, a filter screen 91 is arranged on the door frame 82, and the filter screen 91 is fixed on the door frame 82 through a pressing plate 93, namely, the filter screen 91 is detachably connected with the door frame 82, so that the later cleaning is facilitated.

Preferably, the suction opening 92 of the two air draft air ducts 1 is connected with the same exhaust fan through a pipeline, the exhaust fan is provided with two output ports, and the air draft dust removal of the two air draft air ducts 1 can be realized only by one exhaust fan, so that the energy conservation and the high efficiency are realized.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.

Claims (10)

1. An air draft system of a laser cutting machine comprises two symmetrically arranged air draft air ducts and a cross beam connecting the two air draft air ducts, a plurality of dust suction ports are arranged on the air draft duct, an air door mechanism for controlling the opening or closing of the dust suction ports is arranged on each dust suction port, the air draft duct is connected with an exhaust fan, it is characterized in that each air door mechanism is driven by an air cylinder, the air cylinder is connected with an air pipe, the air pipe is led out of the laser cutting machine through a corresponding air pipe routing structure, each air pipe routing structure comprises an air pipe through hole arranged on the upper surface of the air draft air channel and a first pipe passing hole and a second pipe passing hole arranged on the vertical plate, the first pipe passing port and the second pipe passing port are communicated with each other, the first pipe passing port is positioned on the inner end face of the vertical plate, and the second pipe passing port is positioned on the outer end face of the vertical plate; the trachea passes trachea via hole, first pipe mouth and second in proper order and realizes walking the line, the top in convulsions wind channel is equipped with the protective housing, the protective housing is used for protecting the trachea between trachea via hole and the first pipe mouth.

2. The air draft system of the laser cutting machine according to claim 1, wherein the standing plate is surrounded by an upper top plate, a lower bottom plate, an inner end plate, an outer end plate, a left side plate and a right side plate, a wiring cavity is formed inside the standing plate, the first pipe orifice is arranged on the inner end plate, and the second pipe orifice is arranged on the outer end plate.

3. The air draft system of the laser cutting machine according to claim 1, wherein the protective case includes a case main body having a lower opening and a rear opening, and the case main body is provided with a mounting ear detachably connected to the standing plate.

4. The air draft system of the laser cutting machine according to claim 3, wherein each of the mounting lugs is provided with a vertically extending waist-shaped hole, the standing plate is provided with a threaded hole corresponding to the waist-shaped hole, and each of the waist-shaped holes is provided with an adjusting screw connected with the corresponding threaded hole.

5. The air draft system of the laser cutting machine according to claim 1, wherein the air door mechanism comprises a dust suction port arranged on the air draft air duct, a door frame fixed on the edge of the dust suction port, and an air door plate capable of swinging up and down relative to the door frame to open and close the dust suction port, the air cylinder is arranged beside the door frame, and the air cylinder drives the air door plate to swing through the transmission assembly.

6. The air draft system of the laser cutting machine according to claim 5, wherein the top of the wind door panel is connected with the door frame through an elastic hinge, the transmission assembly comprises a support arranged at the output end of the direct driver, a push wheel rotatably arranged on one side of the support and a guide block arranged on the side portion of the wind door panel in an inclined manner, a guide groove is formed in the guide block, and the push wheel is slidably connected with the guide groove in the guide block.

7. The air draft system of the laser cutting machine according to claim 6, wherein the air draft door plate comprises an air draft door plate main body and wing plates which are arranged on the left side edge and the right side edge of the air draft door plate main body and are turned over towards the inside of the air draft air duct, the guide block comprises two guide oblique sheets which are parallel to each other and a connecting sheet which is connected with the two guide oblique sheets, the two guide oblique sheets and the connecting sheet are enclosed to form the guide groove, and the connecting sheet is fixed on the corresponding wing plate.

8. The air draft system of the laser cutting machine according to claim 6, wherein a support plate is arranged in the air draft air duct, the cylinder is vertically installed on the support plate upward, an inverted U-shaped dustproof side plate is arranged between the support and the end portion of the piston rod of the cylinder, a dustproof panel parallel to the support plate is arranged on the cylinder, and the support plate, the dustproof side plate and the dustproof panel can enclose a dustproof cavity for protecting the piston rod of the cylinder.

9. The air draft system of the laser cutting machine according to claim 5, wherein a filter screen is arranged on the door frame, and the filter screen is fixed on the door frame through a pressing plate.

10. The air draft system of the laser cutting machine according to claim 2, wherein a support rib plate is arranged between the upper top plate and the lower bottom plate, and the air draft openings of the two air draft ducts are connected with the same air draft fan through a pipeline.

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