CN115194341A

CN115194341A - Laser marking machine

Info

Publication number: CN115194341A
Application number: CN202211138289.4A
Authority: CN
Inventors: 李双飞; 李未登
Original assignee: Feiquan Laser Technology Wuxi Co ltd
Current assignee: Feiquan Laser Technology Wuxi Co ltd
Priority date: 2022-09-19
Filing date: 2022-09-19
Publication date: 2022-10-18
Anticipated expiration: 2042-09-19
Also published as: CN115194341B

Abstract

The invention relates to the field of marking, in particular to a laser marking machine. The technical problem is as follows: the disconnect-type design of current hand-held type laser marking machine leads to very easily being hurt at the in-process laser generator of transporting, and can't handle the smog that produces when beating the standard well, can't accomplish simultaneously when beating mark cambered surface original paper and fix spacingly. The technical scheme of the invention is as follows: a laser marking machine comprises a placing box, an anti-collision mechanism and the like; the anti-collision mechanism is arranged on the bottom surface inside the placing box. The laser marking system and the functional components are arranged in the same carrying box, and the freedom of the laser generator in two connecting directions is limited in the placing box, so that the laser generator is prevented from being damaged in the transferring process; utilize the mark original paper of beating of detachable mode processing cambered surface, utilize the stopper to block the lateral part of beating the mark original paper and form the support, the staff need not keep same posture for a long time, has alleviateed staff's working strength.

Description

Laser marking machine

Technical Field

The invention relates to the field of marking, in particular to a laser marking machine.

Background

The marking on the surface of the product is to increase the product description, and besides the traditional equipment type laser marking machine, the marking machine also has a handheld laser marking machine in order to enable the marking machine to be quickly put into different application scenes.

The existing handheld laser marking machine is composed of a laser generator body and a functional piece, the laser generator body and the functional piece are designed in a separated mode, the laser generator body cannot be protected in a moving mode, and the laser generator is extremely prone to being damaged in the transferring process to influence the marking quality; meanwhile, when the existing handheld laser marking machine marks original leather and wood elements, a large amount of smoke can be generated at high temperature, the existing handheld laser marking machine cannot process the smoke well, the smoke influences the marking visual field, and workers can easily suck the smoke to cause body injury.

Present hand-held type laser marking machine is when beating mark cambered surface original paper, can't accomplish well fixed spacing, needs the staff to keep same posture for a long time in order to stabilize the laser instrument body, and the staff need keep concentrating constantly just can accomplish and beat the mark.

Disclosure of Invention

The invention provides a laser marking machine, aiming at overcoming the defects that a laser generator is extremely easy to be damaged in the transferring process due to the separated design of the existing handheld laser marking machine, the smoke generated during marking cannot be well treated, and the fixing and limiting cannot be realized during the marking of an original cambered surface.

The technical scheme of the invention is as follows: a laser marking machine comprises a cushion block; the number of the cushion blocks is four, and the upper parts of the four cushion blocks are fixedly connected with carrying boxes; two lifting rods are arranged at the upper part of the carrying box; a functional box for providing energy and generating light conditions is arranged at the rear side in the carrying box; a placing box is fixedly connected to the front side inside the carrying box; a take-up box is fixedly connected to the front side inside the carrying box and is positioned on the right side of the placing box; the upper parts of the placing box and the take-up box are provided with detachable sealing covers; the device also comprises a fixing mechanism, an anti-collision mechanism, a laser marking system, an adaptive positioning system and a wind power system; a fixing mechanism is arranged on the right side inside the placing box; the bottom surface in the placing box is provided with an anti-collision mechanism; the fixing mechanism is connected with a laser marking system which realizes laser marking and extracts harmful gas generated by marking; the laser marking system is connected with a detachable and replaceable adaptive positioning system, and the adaptive positioning system is applied to a marked object on the cambered surface; the right side of the lower surface in the carrying box is connected with a wind power system for filtering harmful gas and cooling.

Furthermore, the fixing mechanism comprises a support frame, a bearing ring, a connecting seat, a fixing block, a first torsion spring and a locking ring; a support frame is fixedly connected to the right side inside the placing box; two bearing rings are fixedly connected to the supporting frame; each bearing ring is fixedly connected with a connecting seat; each connecting seat is rotatably connected with a fixed block; each fixed block is fixedly connected with a locking ring; a first torsion spring is fixedly connected to the left side and the right side of each fixed block; every two adjacent first torsion springs are fixedly connected with a connecting seat.

Furthermore, both sides of each locking ring are provided with anti-skidding clamping holes.

Furthermore, the anti-collision mechanism comprises a support ring, a second fixing frame, a limiting rod and a third torsion spring; a support ring is fixedly connected to the left side of the bottom of the placing box; a plurality of second fixing frames are fixedly connected to the support ring; each second fixing frame is rotatably connected with a limiting rod; two third torsion springs are fixedly connected to each limiting rod, and every two adjacent third torsion springs are fixedly connected to the same second fixing frame.

Furthermore, the limiting rod is V-shaped, and the upper part of the limiting rod is longer than the lower part of the limiting rod.

Furthermore, the laser marking system comprises a handle, a laser generator, a top cover, a positioning ring and an air duct; the two bearing rings are provided with grips; the grip is provided with a laser generator; a top cover is fixedly connected to the bottom of the laser generator; the bottom of the top cover is provided with a positioning ring; the upper portion of the top cover is fixedly connected with an air guide pipe used for sucking flue gas generated during marking.

Furthermore, the adaptive positioning system comprises an embedded block, a movable disassembling block, a first fixing frame, a driving shaft, a carrying frame, an electric telescopic piece, a supporting block, a limiter and a second torsion spring; the top cover is fixedly connected with an embedded block, and the direction of the embedded block is consistent with the direction of the opening of the positioning ring; the embedded block is connected with a detachable movable disassembling block; the movable disassembling block is fixedly connected with a first fixing frame; the upper part of the first fixing frame is rotatably connected with a driving shaft; the driving shaft is connected with a matched driving motor, and the driving motor is arranged at the side part of the first fixing frame; a carrying frame is fixedly connected to the driving shaft; an electric telescopic piece is fixedly connected to the carrying frame; the telescopic part of the electric telescopic part is fixedly connected with a supporting block; the supporting block is rotatably connected with a limiter; two second torsion springs are fixedly connected to the limiting device, and the two second torsion springs are fixedly connected with the supporting block.

Furthermore, the stopper is Y-shaped cardboard, and inside rigid coupling has two slipmats that the material is rubber.

Furthermore, the tabling block is provided with a Y-shaped limiting groove, and the movable disassembling block is a Y-shaped block.

Further, the wind power system comprises an air box, a filter barrel, a flow divider, a purifier, an electric fan and a filter screen; the lower surface in the carrying box is fixedly connected with a filter barrel; the left part of the filter barrel is fixedly connected with a flow divider; two electromagnetic valves are arranged on the shunt; the gas-guide tube is communicated with the flow divider; the right part of the placing box is provided with an air box; the air box is communicated with the flow divider through a guide pipe; a purifier is fixedly connected inside the filter barrel; the electric fan is fixedly connected inside the filter barrel and is positioned on the right side of the purifier; the filter screen is fixedly connected inside the filter barrel and is positioned at the right side of the electric fan.

The invention has the beneficial effects that: the laser marking device abandons a separate design, the laser marking system and the functional components are arranged in the same carrying box, and meanwhile, the freedom of the laser generator in two connecting directions is limited in the placing box, so that the laser generator is prevented from being damaged in the transferring process; the smoke generated in the marking process is timely pumped away and purified, and the emission quality of the marking is improved.

According to the invention, the marking original piece of the cambered surface is processed in a detachable mode, the side part of the marking original piece is clamped by the limiting stopper to form a support, a worker only needs to assist and fix the handle, the same posture is not required to be kept for a long time, the working strength of the worker is reduced, and the marking quality is effectively improved.

Drawings

FIG. 1 is a schematic view of a first three-dimensional structure of a laser marking machine according to the present invention;

FIG. 2 is a schematic view of a second three-dimensional structure of the laser marking machine of the present invention;

FIG. 3 is a schematic cross-sectional view of a first partial structure of the laser marking machine of the present invention;

FIG. 4 is a schematic cross-sectional view of a first partial structure of the laser marking machine of the present invention;

FIG. 5 is a schematic view of a first placement of the laser marking system of the present invention;

FIG. 6 is a schematic view of a second placement of the laser marking system of the present invention;

FIG. 7 is an enlarged view of region G of the present invention;

FIG. 8 is an enlarged view of region F of the present invention;

FIG. 9 is a perspective view of a laser marking system and adaptive positioning system in accordance with the present invention;

FIG. 10 is an exploded perspective view of the laser marking system and adaptive positioning system of the present invention;

fig. 11 is a schematic perspective view of an adaptive positioning system according to the present invention.

In the reference symbols: 1-cushion block, 2-carrying box, 3-lifting rod, 4-functional box, 5-sealing cover, 6-placing box, 7-supporting frame, 801-bearing ring, 802-connecting seat, 803-fixing block, 804-first torsion spring, 805-locking ring, 901-handle, 902-laser generator, 903-top cover, 904-positioning ring, 905-air duct, 906-embedded block, 101-movable disassembly block, 102-first fixing frame, 103-driving shaft, 104-carrying frame, 105-electric expansion piece, 106-supporting block, 107-position limiter, 108-second torsion spring, 109-antiskid pad, 201-supporting ring, 202-second fixing frame, 203-position limiting rod, 204-third spring, 11-take-up box, 12-air box, 13-filtering barrel, 14-flow divider, 15-purifier, 16-electric fan, 17-filtering net.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

Example 1

A laser marking machine is shown in figures 1-11 and comprises a cushion block 1, a carrying box 2, a lifting rod 3, a function box 4, a sealing cover 5, a placing box 6 and a take-up box 11; four cushion blocks 1 are arranged, and the upper parts of the four cushion blocks 1 are connected with carrying boxes 2 through bolts; two lifting rods 3 are arranged at the upper part of the carrying box 2; a functional box 4 for providing energy and generating light conditions is arranged at the rear side in the carrying box 2; a placing box 6 is connected with the front side bolt inside the carrying box 2; a wire collection box 11 is connected to the front side bolt inside the carrying box 2, and the wire collection box 11 is positioned on the right side of the placing box 6; the upper parts of the placing box 6 and the take-up box 11 are provided with detachable sealing covers 5;

the device also comprises a fixing mechanism, an anti-collision mechanism, a laser marking system, an adaptive positioning system and a wind power system; a fixing mechanism is arranged at the right side inside the placing box 6; the bottom surface in the placing box 6 is provided with an anti-collision mechanism; the fixing mechanism is connected with a laser marking system which realizes laser marking and extracts harmful gas generated by marking; the laser marking system is connected with a detachable and replaceable adaptive positioning system, and the adaptive positioning system is applied to a marked object on the cambered surface; the right side of the lower surface in the carrying box 2 is connected with a wind power system for filtering harmful gas and cooling.

The fixing mechanism comprises a support frame 7, a bearing ring 801, a connecting seat 802, a fixing block 803, a first torsion spring 804 and a locking ring 805; the right side inside the placing box 6 is connected with a supporting frame 7 through a bolt; two bearing rings 801 are connected to the support frame 7 through bolts; each bearing ring 801 is fixedly connected with a connecting seat 802; each connecting seat 802 is rotatably connected with a fixing block 803; each fixing block 803 is fixedly connected with a locking ring 805; a first torsion spring 804 is fixedly connected to the left side and the right side of each fixing block 803; every two adjacent first torsion springs 804 are fixedly connected with a connecting seat 802.

Both sides of each locking ring 805 are provided with anti-slip clamping holes.

The anti-collision mechanism comprises a support ring 201, a second fixing frame 202, a limiting rod 203 and a third torsion spring 204; a support ring 201 is fixedly connected to the left side of the bottom of the placing box 6; a plurality of second fixing frames 202 are fixedly connected to the support ring 201; each second fixing frame 202 is rotatably connected with a limiting rod 203; two third torsion springs 204 are fixedly connected to each limiting rod 203, and each two adjacent third torsion springs 204 are fixedly connected to the same second fixing frame 202.

The stop rod 203 is V-shaped, and the upper part of the stop rod 203 is longer than the lower part.

The laser marking system comprises a handle 901, a laser generator 902, a top cover 903, a positioning ring 904 and an air duct 905; a handle 901 is arranged on the two bearing rings 801; a laser generator 902 is arranged on the grip 901; the bottom of the laser generator 902 is bolted with a top cover 903; a positioning ring 904 is arranged at the bottom of the top cover 903; the upper part of the top cover 903 is fixedly connected with an air duct 905 used for sucking flue gas generated during marking.

The retaining ring 904 is an incomplete seal ring.

The wind power system comprises an air box 12, a filter barrel 13, a flow divider 14, a purifier 15, an electric fan 16 and a filter screen 17; a filter barrel 13 is fixedly connected to the lower surface inside the carrying box 2; a flow divider 14 is fixedly connected to the left part of the filter barrel 13; two electromagnetic valves are arranged on the flow divider 14; the air duct 905 is communicated with the shunt 14; the right part of the placing box 6 is provided with an air box 12; the air box 12 is communicated with the flow divider 14 through a conduit; a purifier 15 is fixedly connected inside the filter barrel 13; an electric fan 16 is fixedly connected inside the filter barrel 13, and the electric fan 16 is positioned on the right side of the purifier 15; a filter screen 17 is fixedly connected inside the filter barrel 13, and the filter screen 17 is positioned at the right side of the electric fan 16.

When the laser marking machine needs to be used, a worker lifts the carrying box 2 to the position of a marking original paper by using the two lifting rods 3, the heights of the four cushion blocks 1 are adjusted to enable the carrying box 2 to keep balance, then the sealing cover 5 is pulled open, the worker pulls open the two locking rings 805 by using hands, then the worker holds the handle 901 and takes up the handle with one hand, the handle 901 drives relevant parts on the handle to move upwards, the top cover 903 is separated from the constraint of the three limiting rods 203 in the upward moving process, therefore, the whole laser marking system is in a handheld suspended state, then the worker takes out a connecting wire placed inside the wire collecting box 11 and the coiled air duct 905 together, then the worker switches on the function box 4 to be powered on, and then selects a program originally input into the function box 4.

After the above operations are completed, the worker holds the handle 901 and positions the laser generator 902 to the position of the marked object, when the surface of the marked object is a flat surface, the positioning ring 904 is directly positioned to the surface of the marked object, then the control program on the function box 4 controls the electric fan 16 inside the filter barrel 13 to operate, meanwhile, the diverter 14 is controlled to be switched on, the electromagnetic valve in the direction of the air duct 905 is opened, the diverter 14 is switched on, the electromagnetic valve in the direction of the air box 12 is closed, marking is completed under the action of the laser generator 902, in the marking process, smoke generated on the surface of part of original pieces is upwards gathered to the top cover 903, meanwhile, the air duct 905 timely extracts the smoke, meanwhile, the smoke enters the filter barrel 13, the smoke is filtered and purified by the purifier 15, then the purified gas is discharged from the end part of the filter barrel 13, meanwhile, the filter screen 17 on the filter barrel 13 effectively intercepts external substances, and prevents dust when the laser marking machine does not work.

After marking is finished, a worker positions the handle 901 above the two bearing rings 801 and then places the handle downwards, in the placing process, the three connecting rods on the top cover 903 contact the three limiting rods 203, then the three limiting rods 203 rotate on the corresponding second fixing frames 202 after being pushed, when the positioning rings 904 contact the support rings 201, the positioning is finished, in the process, the lower parts of the limiting rods 203 always contact the connecting rods on the top cover 903, the lower parts of the limiting rods 203 finally contact the connecting rods on the top cover 903, each limiting rod 203 clamps the connecting rods on the top cover 903 under the action of the corresponding two third torsion springs 204, stable limitation is realized on the laser generator 902, meanwhile, the handle 901 is placed on the two bearing rings 801, and under the action of the first torsion springs 804, each locking ring 805 tightly clamps the corresponding bearing ring 801, so that the handle 901 is fixed; the holding ring 801 and the locking ring 805 fix the handle 901 together, and the three limiting rods 203 fix the top cover 903, so that the freedom of two connecting directions of the laser generator 902 is effectively limited, the laser generator 902 is well fixed inside the placing box 6, and the damage to the laser generator in the transferring process is avoided; after placing case 6 in laser generator 902, because the temperature of overhead guard 903 is higher, can not cover sealed lid 5 immediately, control shunt 14 switch-on air duct 905 ascending solenoid valve is closed, and shunt 14 switch-on bellows 12 ascending solenoid valve is opened, consequently bellows 12 constantly takes away the high-temperature gas who places case 6 inside, realize effectively cooling, can just cover sealed lid 5 after the completion is beaten the mark, need not wait for laser generator 902 main part and overhead guard 903 cooling to finish, the inside temperature of case 6 of placing has been reduced effectively.

Example 2

On the basis of embodiment 1, as shown in fig. 1 and fig. 9 to 11, the adaptive positioning system includes a fitting block 906, a movable detaching block 101, a first fixing frame 102, a driving shaft 103, a carrying frame 104, an electric telescopic member 105, a supporting block 106, a stopper 107 and a second torsion spring 108; a top cover 903 is connected with a tabling block 906 through a bolt, and the direction of the tabling block 906 is consistent with the opening direction of the positioning ring 904; the engaging block 906 is connected with a detachable movable detaching block 101; a first fixing frame 102 is connected to the movable disassembling block 101 through bolts; the upper part of the first fixing frame 102 is rotatably connected with a driving shaft 103; the driving shaft 103 is connected with a matched driving motor, and the driving motor is arranged at the side part of the first fixing frame 102; a carrying frame 104 is fixedly connected on the driving shaft 103; an electric telescopic part 105 is fixedly connected to the carrying frame 104; the telescopic part of the electric telescopic piece 105 is fixedly connected with a supporting block 106; a stopper 107 is rotatably connected to the supporting block 106; two second torsion springs 108 are fixedly connected to the stopper 107, and the two second torsion springs 108 are fixedly connected to the supporting block 106.

The stopper 107 is a Y-shaped clamp plate, and two rubber anti-slip pads 109 are fixedly connected inside the stopper.

The electric telescopic member 105 is an electric push rod.

The engaging block 906 is provided with a Y-shaped stopper groove, and the movable detaching block 101 is a Y-shaped block.

When the marking original is an arc-shaped surface, a worker can take out the laser generator 902 and then install the movable detaching block 101 inside the embedding block 906, and simultaneously turn on the power-on interface of the functional box 4 installed on the top cover 903, and then the worker positions the positioning ring 904 to the center of the arc surface of the marking original and controls the electric telescopic part 105 to operate, the electric telescopic part 105 drives the stopper 107 to be positioned to the side surface of the marking original, and then controls the driving motor at the side part of the driving shaft 103 to operate, under the action of the driving motor, the driving shaft 103 drives the carrying frame 104 to rotate, the carrying frame 104 drives the relevant parts thereon to rotate, at the moment, the stopper 107 which follows the circular rotation contacts the marking original in the process of moving obliquely upwards, and under the action of the two second torsion springs 108, the stopper 107 stably clamps the marking original, and meanwhile, the two anti-skid pads 109 on the stopper 107 provide friction well, so that the worker only needs to fix the handle 901 in an auxiliary way, the same posture is not required to be kept for a long time, the working strength of the worker is reduced, and the marking quality is effectively improved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A laser marking machine comprises a cushion block (1); four cushion blocks (1) are arranged, and the upper parts of the four cushion blocks (1) are fixedly connected with carrying boxes (2); two lifting rods (3) are arranged at the upper part of the carrying box (2); a functional box (4) for providing energy and generating light conditions is arranged at the rear side in the carrying box (2); a placing box (6) is fixedly connected with the front side in the carrying box (2); a take-up box (11) is fixedly connected to the front side inside the carrying box (2), and the take-up box (11) is positioned on the right side of the placing box (6); the upper parts of the placing box (6) and the take-up box (11) are provided with detachable sealing covers (5); the method is characterized in that: the device also comprises a fixing mechanism, an anti-collision mechanism, a laser marking system, an adaptive positioning system and a wind power system; a fixing mechanism is arranged on the right side inside the placing box (6); an anti-collision mechanism is arranged on the bottom surface inside the placing box (6); the fixing mechanism is connected with a laser marking system which realizes laser marking and extracts harmful gas generated by marking; the laser marking system is connected with a detachable and replaceable adaptive positioning system, and the adaptive positioning system is applied to a marked object on the cambered surface; the right side of the lower surface in the carrying box (2) is connected with a wind power system for filtering harmful gas and cooling.

2. The laser marking machine according to claim 1, wherein: the fixing mechanism comprises a support frame (7), a bearing ring (801), a connecting seat (802), a fixing block (803), a first torsion spring (804) and a locking ring (805); a support frame (7) is fixedly connected to the right side inside the placing box (6); two bearing rings (801) are fixedly connected to the support frame (7); each bearing ring (801) is fixedly connected with a connecting seat (802); each connecting seat (802) is rotatably connected with a fixed block (803); each fixing block (803) is fixedly connected with a locking ring (805); a first torsion spring (804) is fixedly connected to the left side and the right side of each fixing block (803); every two adjacent first torsion springs (804) are fixedly connected with a connecting seat (802) together.

3. The laser marking machine according to claim 2, wherein: both sides of each locking ring (805) are provided with anti-slip clamping holes.

4. The laser marking machine according to claim 3, wherein: the anti-collision mechanism comprises a support ring (201), a second fixing frame (202), a limiting rod (203) and a third torsion spring (204); a support ring (201) is fixedly connected to the left side of the bottom of the placing box (6); a plurality of second fixing frames (202) are fixedly connected to the support ring (201); each second fixing frame (202) is rotatably connected with a limiting rod (203); two third torsion springs (204) are fixedly connected to each limiting rod (203), and each two adjacent third torsion springs (204) are fixedly connected to the same second fixing frame (202).

5. The laser marking machine according to claim 4, wherein: the limiting rod (203) is V-shaped, and the upper part of the limiting rod (203) is longer than the lower part.

6. The laser marking machine of claim 5, wherein: the laser marking system comprises a handle (901), a laser generator (902), a top cover (903), a positioning ring (904) and an air duct (905); a handle (901) is arranged on the two bearing rings (801); a laser generator (902) is arranged on the grip (901); a top cover (903) is fixedly connected to the bottom of the laser generator (902); a positioning ring (904) is arranged at the bottom of the top cover (903); the upper part of the top cover (903) is fixedly connected with an air duct (905) for sucking flue gas generated during marking.

7. The laser marking machine according to claim 6, wherein: the adaptive positioning system comprises a tabling block (906), a movable disassembling block (101), a first fixing frame (102), a driving shaft (103), a carrying frame (104), an electric telescopic piece (105), a supporting block (106), a limiting stopper (107) and a second torsion spring (108); the top cover (903) is fixedly connected with a tabling block (906), and the direction of the tabling block (906) is consistent with the opening direction of the positioning ring (904); the embedded block (906) is connected with a detachable movable disassembling block (101); a first fixing frame (102) is fixedly connected to the movable disassembling block (101); the upper part of the first fixing frame (102) is rotatably connected with a driving shaft (103); the driving shaft (103) is connected with a matched driving motor, and the driving motor is arranged at the side part of the first fixing frame (102); a carrying frame (104) is fixedly connected to the driving shaft (103); an electric telescopic piece (105) is fixedly connected to the carrying frame (104); the telescopic part of the electric telescopic piece (105) is fixedly connected with a supporting block (106); a stopper (107) is rotatably connected to the supporting block (106); two second torsion springs (108) are fixedly connected to the limiter (107), and the two second torsion springs (108) are fixedly connected to the supporting block (106).

8. The laser marking machine of claim 7, wherein: the limiter (107) is a Y-shaped clamping plate, and two anti-slip pads (109) made of rubber are fixedly connected inside the limiter.

9. The laser marking machine of claim 8, wherein: the tabling block (906) is provided with a Y-shaped limiting groove, and the movable disassembling block (101) is a Y-shaped block.

10. The laser marking machine of claim 9, wherein: the wind power system comprises a wind box (12), a filter barrel (13), a flow divider (14), a purifier (15), an electric fan (16) and a filter screen (17); a filter barrel (13) is fixedly connected with the lower surface inside the carrying box (2); a flow divider (14) is fixedly connected to the left part of the filter barrel (13); two electromagnetic valves are arranged on the flow divider (14); the air duct (905) is communicated with the flow divider (14); the right part of the placing box (6) is provided with an air box (12); the air box (12) is communicated with the flow divider (14) through a conduit; a purifier (15) is fixedly connected inside the filter barrel (13); an electric fan (16) is fixedly connected inside the filter barrel (13), and the electric fan (16) is positioned on the right side of the purifier (15); a filter screen (17) is fixedly connected inside the filter barrel (13), and the filter screen (17) is positioned at the right side of the electric fan (16).