Dust removal device for laser etching and dust removal method thereof

Abstract

The invention discloses a dust removal device for laser etching and a dust removal method of the dust removal device, and belongs to the technical field of lithium battery dust removal. A belt conveying roller assembly used for conveying a workpiece to be etched and a positive and negative pressure dust removal assembly arranged corresponding to the belt conveying roller assembly are installed in the enclosure cover. The belt conveying roller assembly comprises a back roller and a passing roller which are used for supporting a workpiece to be etched in sequence, and the laser transmitter is arranged towards the back roller; the positive and negative pressure dust removal assembly comprises a positive pressure blowing device mounted at the top of the enclosure cover and a negative pressure dust suction device mounted at the bottom of the enclosure cover; the negative pressure dust suction device comprises a protective cover for collecting dust and protecting a workpiece to be etched; compared with the prior art, under the action of the positive pressure blowing device, dust diffused to the upper space can be blown downwards, particulate matter is prevented from diffusing to the upper space, and under the action of the negative pressure dust suction device, dust dispersed in the etching station space is subjected to negative pressure extraction.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery dust removal, and in particular to a dust removal device and a dust removal method for laser etching. Background Art

[0002] With the in-depth development of lithium battery manufacturing technology, lithium battery pole piece laser etching machines are being used more and more widely in the back-end process of lithium batteries.

[0003] The main mechanism of laser etching of lithium battery pole pieces is: after the battery pole pieces are dried and before they are put into the shell, a specific wavelength laser with precisely controlled power is used to densely ablate and mark the positive or negative pole pieces of the lithium battery. Without affecting the energy density of the battery, part of the active material on the surface of the pole piece is very limitedly removed, and fine lines of a specific depth and width are evenly and densely distributed on its surface. The line width is generally tens to hundreds of microns, and the line depth is generally tens of microns. By etching fine lines on the surface of the lithium battery pole piece, the surface area and roughness of the battery pole piece are increased. After the lithium battery pole piece is put into the shell, the lithium electrode sheet can be fully wetted by the electrolyte inside the lithium battery, thereby improving the performance of the lithium battery.

[0004] Since laser etching of the surface of lithium electrode sheets is a process of rapidly burning, gasifying, expanding and peeling off the active materials on the surface with a high-energy laser beam. 1. A large amount of smoke and dust will be generated during the etching process. If this smoke and dust is not treated in any way, it will scatter on the surface of the electrode sheet and have an adverse effect on the performance of the lithium battery; 2. If the smoke and dust drift into the surrounding space, it will damage the 10,000-level cleanliness of the process workshop; 3. During the etching process, some particles will adhere to the surface of the electrode sheet. When the laser continuously etches the electrode sheet, if it happens to hit the particles adhering to the electrode sheet, the area is not really etched, which will cause uneven etching lines, and then cause the surface density uniformity of different areas of the lithium electrode sheet to be inconsistent; 4. The long-term shrouding of the lithium electrode sheet by smoke and dust will also scatter and weaken the laser, affecting the actual power of the laser reaching the surface of the electrode sheet, resulting in uneven depth and width of the lines etched on the substrate surface, which will also cause the surface density uniformity of different areas of the lithium electrode sheet to be unqualified. Therefore, while the laser is etching the lithium electrode sheet, certain dust removal measures must be taken to quickly remove particulate matter such as smoke and adhesion.

[0005] In the prior art, dust removal at the laser etching station is mainly carried out by enclosing the etching station as a whole and applying negative pressure dust suction. However, the dust removal efficiency and timeliness have not been deeply developed, resulting in unstable quality of lithium battery pole pieces after etching, and often resulting in local unqualified line width and line depth or overall uniformity indicators being unmet, and frequent shutdowns during the etching and scribing process.

[0006] China Publication No. CN108637483A discloses an integrated dust removal device for a laser etching machine, including a dust hood body, an air suction nozzle, and a connecting piece. The dust hood body is a square cavity structure, and an air outlet is provided on the lower half of the right side wall. The connecting piece is a funnel-shaped structure that gradually shrinks. The large end of the connecting piece is welded to match the shape of the air outlet, and the small end of the connecting piece is smoothly connected to the lower end of the air suction nozzle to form an integrated dust hood component; the dust hood body is provided with an annular upper wind shield plate, which is correspondingly connected to the bottom of the laser scanning head; a narrow strip-shaped air inlet is provided at the lower part of the left side wall, and the upper edge of the air inlet is lower than the horizontal center line of the air outlet; an ion wind rod is installed. The dust removal device has a simple and reasonable structure, and the narrow strip-shaped air inlet and the cavity of the dust hood body, the air outlet, and the air suction nozzle are connected through a connecting piece to form a smooth airway that is conducive to gas swirl and increases negative pressure.

[0007] The dust removal device disclosed above is used to suck the lower half to prevent dust from rising and contaminating the laser scanning head. However, since the laser on the above-mentioned dust removal device is arranged from top to bottom, even if there are connected blowing nozzles and air outlets, it will be affected by dust during the laser etching process. At the same time, since the air duct between the blowing nozzle and the air outlet flows through the laser processed workpiece, there is a risk of force displacement of the laser processed workpiece under the action of wind, thereby affecting the laser etching effect. Summary of the invention

[0008] The present invention aims to overcome the defects in the above-mentioned prior art and provides a dust removal device and a dust removal method for laser etching with a positive and negative pressure combined dust removal and precise etching area.

[0009] In order to achieve the above-mentioned invention objectives, the present invention adopts the following technical solutions: a dust removal device for laser etching, comprising an enclosure and a laser emitter arranged toward the enclosure; a tape roller assembly for conveying a workpiece to be etched and a positive and negative pressure dust removal assembly arranged corresponding to the tape roller assembly are installed in the enclosure; the tape roller assembly comprises a back roller and a pass roller which sequentially support the workpiece to be etched, and the laser emitter is arranged toward the back roller; the positive and negative pressure dust removal assembly comprises a positive pressure purge device installed on the top of the enclosure and a negative pressure dust suction device installed on the bottom of the enclosure, the negative pressure dust suction device comprises a protective cover for collecting dust and protecting the workpiece to be etched, and the positive pressure purge device is arranged toward the tangent direction of the workpiece to be etched on the back roller; a particle counter for detecting the dust removal condition in the enclosure is installed on the top of the enclosure.

[0010] As a preferred solution of the present invention, the enclosure comprises a fixed wall panel and a fixed frame mounted on the fixed wall panel, the fixed frame being provided with enclosure plates located on each side of the enclosure, one of the enclosure plates being provided with an inlet and an outlet for conveying the workpiece to be etched.

[0011] As a preferred solution of the present invention, a support frame for simultaneously supporting the back roller and the over roller is installed on the fixed wall panel, and an inner back roller fixing frame for supporting the back roller body and an inner over roller fixing frame for supporting the over roller body are installed on the support frame, and an outer back roller fixing frame for pressing the end of the back roller and an outer over roller fixing frame for pressing the end of the over roller are also provided on the support frame.

[0012] As a preferred solution of the present invention, the over roller is arranged in parallel with the back roller, and the over roller is located below the back roller, and a dust collecting area with a size gradually increasing from top to bottom is formed between the over roller and the back roller.

[0013] As a preferred solution of the present invention, the positive pressure blowing device includes a wind knife arranged along the width direction of the workpiece to be etched, and the two ends of the wind knife are respectively provided with a first fixed plate installed on the fixed wall plate and a second fixed plate installed on the fixed frame.

[0014] As a preferred solution of the present invention, a fixing rod for supporting the end of the wind knife is installed on the second fixing plate, and a damping bearing for adjusting the blowing angle of the wind knife is installed on the end of the wind knife, and the damping bearing is fixedly installed on the fixing rod.

[0015] As a preferred solution of the present invention, the negative pressure dust suction device also includes a support plate installed on the fixed wall panel, on which an inner fixed plate abutting against the outer wall of the shield and an outer fixed plate sleeved on the bottom of the shield are installed. The shield is a semi-enclosed arc structure arranged at the position to be etched, and an etching port corresponding to the laser emitter is formed on the surface of the shield.

[0016] As a preferred solution of the present invention, a first exhaust duct connected to the interior of the protective cover is installed at the bottom of the protective cover, a second exhaust duct is installed at the bottom of the enclosing cover, a third exhaust duct is installed at the bottom of the side of the enclosing cover, and anemometers for detecting the exhaust wind speed are installed in the first exhaust duct, the second exhaust duct and the third exhaust duct.

[0017] As a preferred solution of the present invention, a laser bracket for adjusting the position of the laser emitter is installed at the bottom of the laser emitter, and a laser entrance port is formed on the enclosure plate corresponding to the laser emitter.

[0018] A dust removal method for a dust removal device for laser etching, based on the dust removal device for laser etching, comprises the following steps: Step A: a shielding cover is provided to cover the etching station, and an unwinding mechanism and a winding mechanism are provided outside the shielding cover to drive the workpiece to be etched; Step B: a laser emitter is set at a corresponding etching station, and the laser of the laser emitter is irradiated onto the shield, and the position of the laser emitter is adjusted through the laser bracket according to the position where the laser emitter irradiates onto the shield; Step C: during the etching process of the laser transmitter, the positive pressure purge device and the negative pressure dust suction device are simultaneously turned on, and the wind knife angle is adjusted so that the blowing direction of the wind knife is set toward the tangent direction of the etching position of the workpiece to be etched; Step D: Turn on the particle counter and the anemometers of each exhaust duct in the negative pressure dust collection device to monitor the dust removal situation in the enclosure.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging a belt roller assembly to support and tension the workpiece to be etched, and by driving the workpiece to be etched, the laser emitter at the same position can perform etching operations on different positions of the workpiece to be etched, and at the same time, under the action of the positive pressure purge device, the dust diffused into the upper space can be blown downward to inhibit the diffusion of particles into the upper space, and under the action of the negative pressure dust suction device, the dust dispersed in the etching station space can be removed by negative pressure; By setting up the enclosure, an overall enclosure space is formed for the etching station and the dust removal station to ensure that the dust generated during work will not spread to the surrounding space area; The semi-covering setting of the etching position by the shield and the inclined setting of the workpiece to be etched form a dust collection area with gradually increasing size from top to bottom, so that the minimum size of the dust collection area is correspondingly set at the etching station, which can realize the rapid and efficient absorption of dust at the etching station; By providing the first exhaust duct, the second exhaust duct and the third exhaust duct, the dust inside the protective cover and the dust that escapes to the outside of the protective cover can be adsorbed, thereby achieving multi-point efficient suction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the enclosure; Figure 3 It is the installation diagram of the shield; Figure 4 It is a schematic diagram of the principle of the present invention; Figure 5 It is a front view of the present invention; Figure 6 is a side view of the present invention; Figure 7 is a top view of the present invention; Figure 8 It is the cross-sectional view of the AA surface in 7; Fig. 9 It is a schematic diagram of the structure of the shield; Figure numerals: enclosure 1, fixed wall panel 11, fixed frame 12, enclosure plate 13, belt inlet 14, belt outlet 15, laser inlet 16, laser emitter 2, laser bracket 21, positive pressure purge device 3, wind knife 31, first fixed plate 32, second fixed plate 33, fixed rod 34, damping bearing 35, negative pressure dust suction device 4, protective cover 41, support plate 42, inner fixed plate 43, outer fixed plate 44, etching port 45, back roller 5, over roller 6, particle counter 7, support frame 8, back roller inner fixed frame 81, over roller inner fixed frame 82, back roller outer fixed frame 83, over roller outer fixed frame 84, first exhaust duct 91, second exhaust duct 92, third exhaust duct 93, anemometer 94. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-Figure 9 As shown, a dust removal device for laser etching comprises an enclosure 1 and a laser emitter 2 arranged toward the enclosure 1; a tape roller assembly for conveying a workpiece to be etched and a positive and negative pressure dust removal assembly arranged corresponding to the tape roller assembly are installed in the enclosure 1; the tape roller assembly comprises a back roller 5 and a passing roller 6 which sequentially support the workpiece to be etched, and the laser emitter 2 is arranged toward the back roller 5; the positive and negative pressure dust removal assembly comprises a positive pressure purge device 3 installed on the top of the enclosure 1 and a negative pressure dust suction device 4 installed on the bottom of the enclosure 1, the negative pressure dust suction device 4 comprises a protective cover 41 for collecting dust and protecting the workpiece to be etched, and the positive pressure purge device 3 is arranged toward the tangent direction of the workpiece to be etched on the back roller 5; a particle counter 7 for detecting the dust removal condition in the enclosure 1 is installed on the top of the enclosure 1.

[0023] The shielding cover 1 is used to cover the etching station, so as to minimize the overflow of dust generated by the workpiece to be etched during the etching process. The workpiece to be etched can be a lithium battery cell. The workpiece to be etched is wound on the unwinding roller in the initial state, and a winding roller corresponding to the unwinding roller is set, and the end of the workpiece to be etched is connected to the winding roller. The back roller 5 and the over roller 6 are located between the winding roller and the unwinding roller. While the back roller 5 and the over roller 6 support the workpiece to be etched, the back roller 5 and the over roller 6 also realize the tension of the workpiece to be etched during the transmission process, thereby ensuring the stable transmission of the workpiece to be etched.

[0024] The winding roller is driven by a motor to rotate, so that the workpiece to be etched is driven by the rotation of the winding roller and the winding roller is unwinding. Therefore, under the transmission action of the workpiece to be etched, different positions of the workpiece to be etched correspond to the laser emitter 2, and etching operations on different positions of the workpiece to be etched are achieved without moving the laser emitter 2.

[0025] During the etching process, the positive-pressure purge device 3 and the negative-pressure dust suction device 4 are started synchronously, and the positive-pressure purge device 3 and the negative-pressure dust suction device 4 are respectively arranged on the upper and lower sides of the etching station. Under the action of the positive-pressure purge device 3, the dust generated by etching is blown downward, and under the action of the negative-pressure dust suction device 4, the dust blown downward is adsorbed and collected.

[0026] The positive pressure purge device 3 is arranged toward the tangent direction of the workpiece to be etched on the back roller 5. Under the action of the positive pressure purge device 3, the air blowing of the positive pressure purge device 3 does not affect the etching operation, and blows the dust downward to prevent dust from forming on the laser path of the laser emitter 2, thereby ensuring the laser etching effect.

[0027] The enclosure 1 comprises a fixed wall panel 11 and a fixed frame 12 mounted on the fixed wall panel 11, and the fixed frame 12 is provided with enclosure plates 13 located on each side of the enclosure 1, wherein one of the enclosure plates 13 is formed with an inlet 14 and an outlet 15 for conveying workpieces to be etched.

[0028] The fixed frame 12 is composed of a plurality of fixed profiles and fixed corner tips connected between adjacent fixed profiles. The fixed frame 12 is used to cover the entire etching station, and the fixed wall panel 11 is one of the side surfaces of the enclosure 1. The fixed frame 12 is installed based on the fixed wall panel 11, and the fixed wall panel 11 is also used as a reference to fix the etching station on the entire laser etching machine.

[0029] The shielding plate 13 is a sheet metal plate, and is arranged on the other side except the fixed wall panel 11. Under the action of the shielding plate 13, the interior of the enclosure 1 is formed into a relatively closed space, and the interior space of the enclosure 1 is the main space for laser etching and dust removal.

[0030] A support frame 8 for simultaneously supporting the back roller 5 and the over roller 6 is installed on the fixed wall panel 11, and a back roller inner fixing frame 81 for supporting the main body of the back roller 5 and an over roller inner fixing frame 82 for supporting the main body of the over roller 6 are installed on the support frame 8. The support frame 8 is also provided with a back roller outer fixing frame 83 for pressing the end of the back roller 5 and an over roller outer fixing frame 84 for pressing the end of the over roller 6.

[0031] The back roller 5 and the over roller 6 are suspended in the enclosure 1, and both the back roller 5 and the over roller 6 are passive rollers. The workpiece to be etched passes through the back roller 5 and the over roller 6 in turn to drive the back roller 5 and the over roller 6 to rotate. The support frame 8 is used to support and limit the position of the back roller 5 and the over roller 6 to ensure that the position of the back roller 5 and the over roller 6 does not change during the transmission of the workpiece to be etched, and the back roller 5 and the over roller 6 always support and tension the workpiece to be etched.

[0032] The support frame 8 is fixedly connected to the fixed wall panel 11 by bolts, and the back roller inner fixing frame 81 and the over roller inner fixing frame 82 are respectively fixedly connected to the top and bottom of the support frame 8 by bolts, thereby ensuring that the back roller inner fixing frame 81 and the over roller inner fixing frame 82 connected to the same support frame 8 are always in relative positions.

[0033] The back roller inner fixing frame 81 is arranged corresponding to the middle part of the back roller 5, and is mainly used for installing the back roller outer fixing frame 83. The back roller outer fixing frame 83 is provided with a bearing corresponding to the back roller 5, and the back roller outer fixing frame 83 is arranged to clamp the end of the back roller 5. Under the action of the back roller outer fixing frame 83, the main body of the back roller 5 is overheadly arranged on the back roller inner fixing frame 81.

[0034] Similarly, the inner roller fixing frame 82 is set corresponding to the middle part of the roller 6. The inner roller fixing frame 82 is mainly used to install the outer roller fixing frame 84. The outer roller fixing frame 84 is provided with a bearing corresponding to the roller 6, and the outer roller fixing frame 84 is set to clamp the end of the back roller 5. Under the action of the outer roller fixing frame 84, the main body of the roller 6 is suspended on the inner roller fixing frame 82.

[0035] The passing roller 6 is arranged in parallel with the back roller 5 , and the passing roller 6 is located below the back roller 5 , and a dust collecting area with a size gradually increasing from top to bottom is formed between the passing roller 6 and the back roller 5 .

[0036] The distance between the back roller 5 and the shield 41 is smaller than the distance between the over roller 6 and the shield 41. Therefore, under the action of the over roller 6 and the back roller 5, the workpiece to be etched passing through the over roller 6 and the back roller 5 is in an inclined state, and combined with the shield 41, a dust collecting area with a size gradually increasing from top to bottom is formed between the workpiece to be etched and the shield 41. Since a first exhaust pipe 91 is installed at the bottom of the shield 41, a negative pressure is formed in the dust collecting area under the action of the first exhaust pipe 91, and the first exhaust pipe 91 is correspondingly set at the maximum size of the dust collecting area, so that under the action of the first exhaust pipe 91, the minimum size of the dust collecting area has a maximum negative pressure value, and the minimum size of the dust collecting area is correspondingly set at the etching station, which can realize the rapid and efficient absorption of dust at the etching station.

[0037] The positive pressure purge device 3 comprises an air knife 31 arranged along the width direction of the workpiece to be etched, and the two ends of the air knife 31 are respectively provided with a first fixing plate 32 installed on the fixed wall plate 11 and a second fixing plate 33 installed on the fixed frame 12.

[0038] The first fixing plate 32 is fixedly connected to the fixing wall plate 11 by bolts, and the second fixing plate 33 is fixedly connected to the fixing frame 12 by a compass. Under the action of the first fixing plate 32 and the second fixing plate 33, the overhead setting of the wind knife 31 is realized.

[0039] A fixing rod 34 for supporting the end of the wind knife 31 is installed on the second fixing plate 33 . A damping bearing 35 for adjusting the blowing angle of the wind knife 31 is installed on the end of the wind knife 31 . The damping bearing 35 is fixedly installed on the fixing rod 34 .

[0040] The fixing rod 34 is fixedly connected to the second fixing plate 33 by bolts, and the number of the fixing rods 34 is set according to actual needs. The fixing rod 34 is used to install the damping bearing 35, and the end of the wind knife 31 is clamped in the damping bearing 35. When the angle of the wind knife 31 needs to be adjusted, the damping bearing 35 is used to lock the angle of the wind knife 31 after the angle is adjusted.

[0041] The negative pressure dust suction device 4 also includes a support plate 42 installed on the fixed wall panel 11, on which an inner fixed plate 43 abutting against the outer wall of the shield 41 and an outer fixed plate 44 sleeved on the bottom of the shield 41 are installed. The shield 41 is a semi-enclosed arc structure arranged at the position to be etched, and an etching port 45 corresponding to the laser emitter 2 is formed on the surface of the shield 41.

[0042] The support plate 42 is fixedly connected to the fixed wall plate 11 by bolts. The inner fixing plate 43 and the outer fixing plate 44 are used to clamp and position the shield 41 . The position of the etching opening 45 corresponds to the position of the laser emitter 2 .

[0043] A first exhaust duct 91 connected to the interior of the protective cover 41 is installed at the bottom of the protective cover 41, a second exhaust duct 92 is installed at the bottom of the enclosing cover 1, and a third exhaust duct 93 is installed at the bottom of the side of the enclosing cover 1, and an anemometer 94 for detecting the exhaust wind speed is installed in the first exhaust duct 91, the second exhaust duct 92 and the third exhaust duct 93.

[0044] The first exhaust pipe 91 is used to absorb dust in the protective cover 41 , and the second exhaust pipe 92 and the third exhaust pipe 93 are used to absorb dust in the enclosure 1 and outside the protective cover 41 .

[0045] A laser bracket 21 for adjusting the position of the laser emitter 2 is installed at the bottom of the laser emitter 2 , and a laser entrance port 16 is formed on the enclosing plate 13 corresponding to the laser emitter 2 .

[0046] A dust removal method for a dust removal device for laser etching, based on the dust removal device for laser etching, comprises the following steps: Step A: Set up an enclosure 1 to cover the etching station, and set up a reeling mechanism and a winding mechanism outside the enclosure 1 to drive the workpiece to be etched, and under the action of the back roller 5, the passing roller 6 and the protective cover 41, a dust collecting area with a size gradually increasing from top to bottom is formed below the etching station, and the top opening of the dust collecting area corresponds to the etching station.

[0047] Step B: a laser emitter 2 is set at a corresponding etching station, and the laser of the laser emitter 2 is irradiated onto the shield 41. The position of the laser emitter 2 is adjusted through the laser bracket at the position where the laser emitter 2 irradiates the shield 41.

[0048] Step C: During the etching process of the laser emitter 2, the positive pressure purge device 3 and the negative pressure dust suction device 4 are simultaneously turned on, and the angle of the wind knife 31 is adjusted so that the blowing direction of the wind knife 31 is set toward the tangent direction of the etching position of the workpiece to be etched.

[0049] Under the action of the positive pressure purge device 3 and the negative pressure dust suction device 4, the dust generated during the etching process is blown downward and absorbed.

[0050] Step D: Turn on the particle counter 7 and the anemometers of each exhaust pipe in the negative pressure dust suction device 4 to monitor the dust removal situation in the enclosure 1.

[0051] During actual use, the shielding cover 1 forms an overall enclosed space for the etching station and the dust removal station to ensure that the dust generated during operation will not spread to the surrounding space area. During operation, the laser irradiates the lithium electrode sheet coated on the back roller 5 for etching, forming a large amount of particles and dust. The wind knife 31 directly above the etching station blows out positive pressure wind to blow the dust diffused into the upper space downward, thereby suppressing the diffusion of particles to the upper space and affecting the laser path. The first exhaust pipe 91 connected to the bottom of the shield 41 is connected to the negative pressure fan. The negative pressure air in the shield 41 performs negative pressure extraction on the particles falling into the shield 41 and the dust dispersed in the etching station space.

[0052] Since the protective cover 41 is provided with an etching opening 45, inevitably, a small amount of dust will escape into the entire space of the enclosure 1. The dust dispersed in the space is drawn away by the negative pressure wind inside the second exhaust duct 92 and the third exhaust duct 93 connected to the enclosure 1. The second exhaust duct 92 and the third exhaust duct 93 are also connected to the negative pressure fan.

[0053] The particle counter 7 is used to monitor the actual dust removal effect of the dust removal station in real time; the exhaust wind speed on the exhaust pipe is monitored in real time by a digital anemometer 94, and the outlet wind speed at the wind knife 31 can be detected using a portable Pitot tube anemometer.

[0054] During laser etching, the dust particles generated are distributed in the range of 3~50μm. All dust with a particle size of 5μm or more should be removed, and the removal rate of dust with a particle size of 3~5 should reach more than 99.8% to meet the cleanliness requirements of the lithium electrode sheet. To achieve this dust removal effect, an optimized dust removal method is: the surface finish of the inner wall of the shield, dust removal duct, etc. is good enough, with a finish of Ra0.8 or more; the wind speed at the blowing port (slit) of the wind knife 31 is 8-12m / s, and the internal exhaust wind speed of the three exhaust pipes is 15-20 m / s; the blowing angle of the wind knife 31 is tangent to the back roller 5, that is, vertical 90°.

[0055] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0056] Although the following terms are used more frequently in this paper: enclosure 1, fixed wall plate 11, fixed frame 12, enclosure plate 13, belt inlet 14, belt outlet 15, laser inlet 16, laser emitter 2, laser bracket 21, positive pressure purge device 3, wind knife 31, first fixed plate 32, second fixed plate 33, fixed rod 34, damping bearing 35, negative pressure dust suction device 4, shield 41, support plate 42, inner fixed plate 43, outer fixed plate 44, etching port 45, back roller 5, over roller 6, particle counter 7, support frame 8, back roller inner fixed frame 81, over roller inner fixed frame 82, back roller outer fixed frame 83, over roller outer fixed frame 84, first exhaust pipe 91, second exhaust pipe 92, third exhaust pipe 93, anemometer 94, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A dust removal device for laser etching, comprising an enclosure (1) and a laser emitter (2) arranged toward the enclosure (1); characterized in that: The enclosure (1) is provided with a belt conveyor roller assembly for conveying a workpiece to be etched and a positive and negative pressure dust removal assembly arranged corresponding to the belt conveyor roller assembly; the belt conveyor roller assembly comprises a back roller (5) and a pass roller (6) which sequentially support the workpiece to be etched, and the laser emitter (2) is arranged toward the back roller (5); the positive and negative pressure dust removal assembly comprises a positive pressure purge device (3) installed on the top of the enclosure (1) and a negative pressure dust suction device (4) installed on the bottom of the enclosure (1), the negative pressure dust suction device (4) comprising a protective cover (41) for collecting dust and protecting the workpiece to be etched, and the positive pressure purge device (3) is arranged toward the tangent direction of the workpiece to be etched on the back roller (5); the top of the enclosure (1) is provided with a particle counter (7) for detecting the dust removal condition in the enclosure (1).

2. A dust removal device for laser etching according to claim 1, characterized in that: The enclosure (1) comprises a fixed wall panel (11) and a fixed frame (12) mounted on the fixed wall panel (11); the fixed frame (12) is mounted with enclosure plates (13) located on each side of the enclosure (1); one of the enclosure plates (13) is formed with a belt inlet (14) and a belt outlet (15) for conveying a workpiece to be etched.

3. A dust removal device for laser etching according to claim 2, characterized in that: The fixed wall panel (11) is provided with a support frame (8) for simultaneously supporting the back roller (5) and the over roller (6); the support frame (8) is provided with a back roller inner fixing frame (81) for supporting the main body of the back roller (5) and an over roller inner fixing frame (82) for supporting the main body of the over roller (6); the support frame (8) is also provided with a back roller outer fixing frame (83) for pressing the end of the back roller (5) and an over roller outer fixing frame (84) for pressing the end of the over roller (6).

4. A dust removal device for laser etching according to claim 3, characterized in that: The over roller (6) is arranged in parallel with the back roller (5), and the over roller (6) is located below the back roller (5), and a dust collecting area is formed between the over roller (6) and the back roller (5), the size of which gradually increases from top to bottom.

5. The dust removal device for laser etching according to claim 2, characterized in that: The positive pressure purge device (3) comprises an air knife (31) arranged along the width direction of the workpiece to be etched, and two ends of the air knife (31) are respectively provided with a first fixing plate (32) mounted on the fixing wall plate (11) and a second fixing plate (33) mounted on the fixing frame (12).

6. A dust removal device for laser etching according to claim 5, characterized in that: A fixing rod (34) for supporting the end of the wind knife (31) is mounted on the second fixing plate (33); a damping bearing (35) for adjusting the blowing angle of the wind knife (31) is mounted on the end of the wind knife (31); the damping bearing (35) is fixedly mounted on the fixing rod (34).

7. The dust removal device for laser etching according to claim 2, characterized in that: The negative pressure dust suction device (4) further comprises a support plate (42) mounted on the fixed wall plate (11), an inner fixing plate (43) abutting against the outer wall of the shield (41) and an outer fixing plate (44) sleeved on the bottom of the shield (41) being mounted on the support plate (42), the shield (41) being a semi-enclosed arc-shaped structure arranged at a position to be etched, and an etching opening (45) corresponding to the laser emitter (2) being formed on the surface of the shield (41).

8. The dust removal device for laser etching according to claim 7, characterized in that: A first exhaust pipe (91) connected to the interior of the protective cover (41) is installed at the bottom of the protective cover (41), a second exhaust pipe (92) is installed at the bottom of the enclosure cover (1), a third exhaust pipe (93) is installed at the bottom of the side of the enclosure cover (1), and anemometers (94) for detecting exhaust wind speed are installed in the first exhaust pipe (91), the second exhaust pipe (92) and the third exhaust pipe (93).

9. The dust removal device for laser etching according to claim 2, characterized in that: A laser bracket (21) for adjusting the position of the laser emitter (2) is installed at the bottom of the laser emitter (2), and a laser entrance opening (16) is formed on the enclosure plate (13) corresponding to the laser emitter (2).

10. A dust removal method for a dust removal device for laser etching, based on the dust removal device for laser etching according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step A: a shielding cover (1) is provided to cover the etching station, and a reeling mechanism and a reeling mechanism are provided outside the shielding cover (1) to drive the workpiece to be etched; Step B: a laser emitter (2) is arranged at a corresponding etching station, and the laser of the laser emitter (2) is irradiated onto the protective cover (41), and the position of the laser emitter (2) is adjusted through a laser bracket at the position where the laser emitter (2) irradiates the protective cover (41); Step C: during the etching process of the laser emitter (2), the positive pressure purge device (3) and the negative pressure dust suction device (4) are simultaneously turned on, and the angle of the wind knife (31) is adjusted so that the blowing direction of the wind knife (31) is set toward the tangent direction of the etching position of the workpiece to be etched; Step D: Turn on the particle counter (7) and the anemometers of each exhaust pipe in the negative pressure dust suction device (4) to monitor the dust removal situation in the enclosure (1).

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