CN111014979A - Protection mechanism is used in laser cutting production - Google Patents

Protection mechanism is used in laser cutting production Download PDF

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Publication number
CN111014979A
CN111014979A CN201911352750.4A CN201911352750A CN111014979A CN 111014979 A CN111014979 A CN 111014979A CN 201911352750 A CN201911352750 A CN 201911352750A CN 111014979 A CN111014979 A CN 111014979A
Authority
CN
China
Prior art keywords
protective cover
laser cutting
protection mechanism
cutting production
air suction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911352750.4A
Other languages
Chinese (zh)
Inventor
周翔
黄仲佳
周晓宏
罗贤国
张勇
孙文明
赵薇
郑兰斌
吴志华
王心生
杨军
李思文
宗泽
吕晨
艾晓蕾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Chungu 3D Printing Technology Research Institute of Intelligent Equipment Industry
Original Assignee
Anhui Chungu 3D Printing Technology Research Institute of Intelligent Equipment Industry
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Chungu 3D Printing Technology Research Institute of Intelligent Equipment Industry filed Critical Anhui Chungu 3D Printing Technology Research Institute of Intelligent Equipment Industry
Priority to CN201911352750.4A priority Critical patent/CN111014979A/en
Publication of CN111014979A publication Critical patent/CN111014979A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36Removing material
    • B23K26/38Removing material by boring or cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70Auxiliary operations or equipment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70Auxiliary operations or equipment
    • B23K26/702Auxiliary equipment

Abstract

The invention discloses a protective mechanism for laser cutting production, which comprises a cross beam, wherein the bottom of the cross beam is provided with a moving assembly, the moving assembly comprises a screw rod, two ends of the screw rod are fixedly arranged on the lower surface of the cross beam through bearings with seats, the surface of the screw rod is in threaded connection with a rotating sleeve, the rotating sleeve is slidably arranged in the cross beam, one end of the screw rod is fixedly provided with a first motor, the bottom of the rotating sleeve is fixedly connected with a support, the bottom of the support is slidably provided with a protective cover, a first spring is arranged between the protective cover and the support, a guide rod penetrates through the first spring and is arranged in the protective cover and extends into the protective cover, one end of the guide rod, which is positioned in the protective cover, is fixedly arranged on a limiting plate, one side of the protective cover is penetrated and provided with two groups of air, the harmful gas is treated in time, and the health of operators is protected.

Description

Protection mechanism is used in laser cutting production
Technical Field
The invention belongs to the technical field of laser cutting, and particularly relates to a protection mechanism for laser cutting production.
Background
Laser devices can be divided into three major categories: the laser marking machine comprises a laser marking machine, a laser welding machine and a laser cutting machine, wherein the laser marking machine currently comprises a semiconductor laser marking machine, a CO2 laser marking machine, a fiber laser marking machine, an ultraviolet laser marking machine and the like; the laser welding machine comprises a YAG laser automatic welding machine, an optical fiber transmission automatic laser welding machine and the like at present; the laser cutting machine includes a YAG laser cutting machine, an optical fiber laser cutting machine, and the like.
Laser cutting is a technique that uses laser to cut materials, typically for industrial production applications. The working principle of laser cutting is to direct the output of a high power laser, usually through optics. Laser cutting machines are characterized by a cutting head that generates a laser beam, which moves in two transverse dimensions on a workpiece loaded onto a work table. A focused laser beam is directed onto the workpiece, and then a portion of the workpiece is melted, burned, and evaporated. Thus, a cutting edge with a high quality surface finish is produced.
Laser cutting machine is widely used in industrial production as one kind of laser equipment, and general laser cutting machine can produce a large amount of high temperature splash when carrying out the work piece cutting, can produce harmful gas simultaneously, if the splash splashes to operating personnel on one's body, will threaten operating personnel's safety, and the harmful gas that produces simultaneously will threaten operating personnel's healthy too.
Therefore, the protection mechanism for laser cutting production is provided for solving the problems in the prior art, a group of protection covers is arranged at the position of a laser cutting head, and an air suction device is arranged at the top of each protection cover, so that splashes are prevented from splashing on the body of an operator, harmful gas is timely treated, and the body health of the operator is protected; set up elevating gear between protection casing and laser cutting head, when being convenient for debug and change cutting means, avoid producing between protection casing and the cutting object and interfere.
Disclosure of Invention
The invention aims to provide a protection mechanism for laser cutting production, which aims to solve the problems that a large amount of high-temperature splashes and harmful gas are generated when a general laser cutting machine in the prior art cuts workpieces, the safety of operators is threatened if the splashes are splashed onto the bodies of the operators, and the health of the operators is threatened by the generated harmful gas.
In order to achieve the purpose, the invention adopts the following technical scheme: a protection mechanism for laser cutting production comprises a cross beam, wherein a moving assembly is arranged at the bottom of the cross beam and comprises a lead screw, two ends of the lead screw are fixedly arranged on the lower surface of the cross beam through a bearing with a seat, the surface of the lead screw is in threaded connection with a rotary sleeve, the rotary sleeve is slidably arranged in the cross beam, one end of the lead screw is fixedly provided with a first motor, the bottom of the rotary sleeve is fixedly connected with a support, the bottom of the support is slidably provided with a protection cover, a first spring is arranged between the protection cover and the support, a guide rod is installed in the first spring in a penetrating manner and penetrates through the protection cover and extends into the protection cover, one end of the guide rod, which is positioned in the protection cover, is fixedly arranged on a limiting plate, two groups of air suction pipes are installed in a penetrating manner on one side of the protection cover, an air, the utility model discloses a novel air suction pipe, including suction pipe, filter box, connecting plate, suction pipe, suction fan, suction pipe, connecting plate, and connecting plate are fixed mounting has the steel wire hose, fixed mounting has the filter cartridge between steel wire hose and the suction fan, be hollow structure in the filter cartridge, and the filter cartridge intussuseption is filled with the active carbon granule, the suction pipe one side fixed mounting is kept away from to the protection casing has the subassembly of blowing, the subassembly of blowing includes the connecting plate, connecting plate slidable mounting is in protection casing one side, and the connecting plate is located the inside one.
Preferably, a clamping groove is formed in the cross beam, a moving block is fixedly mounted at the top of the rotating sleeve, the moving block is slidably mounted in the clamping groove, and the moving block and the clamping groove are in clearance fit.
Preferably, the support includes the connecting rod, and two sets of connecting rod bottom fixed mounting has the fixed plate, the guide bar slidable mounting is in the fixed plate.
Preferably, the suction fan is fixedly arranged on one side of the upper surface of the fixing plate.
Preferably, a notch is formed in one side of the protective cover, sliding grooves are symmetrically formed in the notch, sliding blocks are fixedly connected to two sides of the connecting plate, and the sliding grooves are in clearance fit with the sliding blocks.
Preferably, a lantern ring is fixedly installed between the two sets of fan blades, and the lantern ring is fixedly connected with the output shaft end of the second motor through a flat key.
Preferably, the output shaft end of the electric push rod is fixedly provided with a joint, the joint is fixedly arranged on the upper surface of the connecting plate, and the electric push rod is fixedly arranged on one side of the outer portion of the protective cover.
Preferably, two groups of clamping plates are arranged in the fixing plate in a sliding mode, and the clamping plates are fixedly connected with the fixing plate through second springs.
Preferably, one side of the protective cover is provided with through holes at the penetrating positions of the two groups of air suction pipes.
The invention has the technical effects and advantages that: compared with the prior art, the protection mechanism for laser cutting production provided by the invention has the following advantages:
1. a group of protective covers are arranged at the laser cutting head, and an air suction device is arranged at the top of each protective cover, so that splashes are prevented from splashing on the body of an operator, harmful gas is treated in time, and the health of the operator is protected;
2. set up elevating gear between protection casing and laser cutting head, when being convenient for debug and change cutting means, avoid producing between protection casing and the cutting object and interfere.
Drawings
FIG. 1 is a schematic structural view of a protection mechanism for laser cutting production according to the present invention;
FIG. 2 is a schematic side view of a protection mechanism for laser cutting production according to the present invention;
FIG. 3 is an enlarged schematic view of a portion A of the protection mechanism for laser cutting production of the present invention;
FIG. 4 is an enlarged schematic structural view of a portion B in FIG. 1 of a protection mechanism for laser cutting production according to the present invention;
FIG. 5 is a schematic cross-sectional view of a protective cover of the protective mechanism for laser cutting production according to the present invention;
fig. 6 is a schematic top view of a fixing plate of a protection mechanism for laser cutting production according to the present invention.
In the figure: 1. a cross beam; 101. a card slot; 2. a moving assembly; 201. a screw rod; 202. a rotating sleeve; 203. a first motor; 204. a moving block; 3. a support; 301. a connecting rod; 302. a fixing plate; 303. a splint; 304. a second spring; 4. a protective cover; 401. a notch; 402. a chute; 403. a through hole; 5. a first spring; 6. a guide bar; 7. a limiting plate; 8. an air suction pipe; 9. an air suction fan; 10. a steel wire hose; 11. a filter cartridge; 12. a blowing assembly; 1201. a connecting plate; 1202. a second motor; 1203. a fan blade; 1204. an electric push rod; 1205. a slider; 1206. a collar; 1207. a joint; 13. activated carbon particles; 14. laser cutting head.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a protection mechanism for laser cutting production, which comprises a cross beam 1, wherein a moving assembly 2 is arranged at the bottom of the cross beam 1, the moving assembly 2 comprises a lead screw 201, two ends of the lead screw 201 are fixedly arranged on the lower surface of the cross beam 1 through bearings with seats, a rotating sleeve 202 is in threaded connection with the surface of the lead screw 201, the rotating sleeve 202 is slidably arranged in the cross beam 1, a first motor 203 is fixedly arranged at one end of the lead screw 201, a clamping groove 101 is formed in the cross beam 1, a moving block 204 is fixedly arranged at the top of the rotating sleeve 202, the moving block 204 is slidably arranged in the clamping groove 101, and the moving block 204 is in clearance fit with.
Fixed connection has support 3 in swivel sleeve 202 bottom, 3 bottom sliding mounting of support has protection casing 4, be provided with first spring 5 between protection casing 4 and the support 3, it installs guide bar 6 to run through in first spring 5, guide bar 6 runs through in protection casing 4 and extend to inside the protection casing 4, support 3 includes connecting rod 301, two sets of connecting rod 301 bottom fixed mounting have fixed plate 302, 6 sliding mounting of guide bar are in fixed plate 302, and guide bar 6 is located the inside one end fixed mounting in limiting plate 7 of protection casing 4, slidable mounting has two sets of splint 303 in fixed plate 302, through second spring 304 fixed connection between splint 303 and the fixed plate 302.
Two sets of aspiration channels 8 are installed in the one side of protection casing 4 through-going, 3 top fixed mounting of support have an induced draft fan 9, induced draft fan 9 fixed mounting is in fixed plate 302 upper surface one side, 8 one end fixed mounting of air intake and aspiration channel of induced draft fan 9 are connected, fixed mounting has flexible steel wire hose 10 in the aspiration channel 8, fixed mounting has filter box 11 between flexible steel wire hose 10 and the induced draft fan 9, be hollow structure in the filter box 11, and the filter box 11 intussuseption is filled with active carbon particle 13.
A blowing assembly 12 is fixedly installed on one side, far away from the air suction pipe 8, of the protective cover 4, the blowing assembly 12 comprises a connecting plate 1201, the connecting plate 1201 is slidably installed on one side of the protective cover 4, a second motor 1202 is fixedly installed on one side, located inside the protective cover 4, of the connecting plate 1201, fan blades 1203 are fixedly installed on the output shaft end of the second motor 1202, a lantern ring 1206 is fixedly installed between the two sets of fan blades 1203, the lantern ring 1206 and the output shaft end of the second motor 1202 are fixedly connected through a flat key, an electric push rod 1204 is fixedly installed at the top of the connecting plate 1201, a notch 401 is formed in one side of the protective cover 4, sliding grooves 402 are symmetrically formed in the notch 401, sliding blocks 1205 are fixedly connected to two sides of the connecting plate 1201, the sliding grooves 402 are in clearance fit with the sliding blocks 1205, a, one side of the protective cover 4 is provided with through holes 403 at the penetrating positions of the two groups of air suction pipes 8.
A laser cutting head 14 is fixedly arranged in the bracket 3.
The structure principle is as follows: the laser cutting machine is characterized in that a group of cross beams 1 are arranged, a group of movable supports 3 are arranged at the bottom of each cross beam 1, a group of laser cutting heads 14 are arranged in each support 3, a group of protective covers 4 are arranged outside the laser cutting heads 14, an air suction fan 9 is arranged at the tops of the protective covers 4, a group of connecting plates 1201 driven by electric push rods 1204 are arranged on one sides inside the protective covers 4, a second motor 1202 is fixedly arranged on one sides of the connecting plates 1201, fan blades 1203 are fixedly arranged at the output shaft end of the second motor 1202, when the laser cutting machine is used, the air suction fan 9 and the second motor 1202 are started simultaneously, harmful gas generated during laser cutting is discharged timely, splashed onto the bodies of operators or falls back to the surfaces of workpieces, and;
a first spring 5 and a guide bar 6 are provided between the shield 4 and the holder 3 to prevent interference between the shield 4 and the object to be cut when laser cutting is performed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (9)

1. The utility model provides a protection machanism is used in laser cutting production, includes crossbeam (1), its characterized in that: the bottom of the cross beam (1) is provided with a moving assembly (2);
the moving assembly (2) comprises a screw rod (201), two ends of the screw rod (201) are fixedly mounted on the lower surface of the cross beam (1) through bearings with seats, the surface of the screw rod (201) is in threaded connection with a rotating sleeve (202), the rotating sleeve (202) is slidably mounted in the cross beam (1), and a first motor (203) is fixedly mounted at one end of the screw rod (201);
the bottom of the rotating sleeve (202) is fixedly connected with a support (3), a protective cover (4) is slidably mounted at the bottom of the support (3), a first spring (5) is arranged between the protective cover (4) and the support (3), a guide rod (6) penetrates through the first spring (5), the guide rod (6) penetrates through the protective cover (4) and extends into the protective cover (4), and one end, located inside the protective cover (4), of the guide rod (6) is fixedly mounted on a limiting plate (7);
two groups of air suction pipes (8) are installed on one side of the protective cover (4) in a penetrating mode, an air suction fan (9) is fixedly installed at the top of the support (3), an air inlet of the air suction fan (9) is fixedly installed and connected with one end of each air suction pipe (8), a steel wire hose (10) is fixedly installed in each air suction pipe (8), a filter box (11) is fixedly installed between each steel wire hose (10) and each air suction fan (9), the filter box (11) is of a hollow structure, and activated carbon particles (13) are filled in each filter box (11);
a blowing assembly (12) is fixedly installed on one side, away from the air suction pipe (8), of the protective cover (4), the blowing assembly (12) comprises a connecting plate (1201), the connecting plate (1201) is installed on one side of the protective cover (4) in a sliding mode, a second motor (1202) is fixedly installed on one side, located inside the protective cover (4), of the connecting plate (1201), fan blades (1203) are fixedly installed on an output shaft end of the second motor (1202), and an electric push rod (1204) is fixedly installed on the top of the connecting plate (1201);
a laser cutting head (14) is fixedly arranged in the support (3).
2. The protection mechanism for laser cutting production according to claim 1, characterized in that: a clamping groove (101) is formed in the cross beam (1), a moving block (204) is fixedly mounted at the top of the rotating sleeve (202), the moving block (204) is slidably mounted in the clamping groove (101), and the moving block (204) is in clearance fit with the clamping groove (101).
3. The protection mechanism for laser cutting production according to claim 1, characterized in that: the support (3) comprises connecting rods (301), two groups of fixing plates (302) are fixedly mounted at the bottoms of the connecting rods (301), and the guide rods (6) are slidably mounted in the fixing plates (302).
4. The protection mechanism for laser cutting production according to claim 1, characterized in that: and the suction fan (9) is fixedly arranged on one side of the upper surface of the fixing plate (302).
5. The protection mechanism for laser cutting production according to claim 1, characterized in that: a notch (401) is formed in one side of the protective cover (4), sliding grooves (402) are symmetrically formed in the notch (401), sliding blocks (1205) are fixedly connected to two sides of the connecting plate (1201), and the sliding grooves (402) are in clearance fit with the sliding blocks (1205).
6. The protection mechanism for laser cutting production according to claim 1, characterized in that: a lantern ring (1206) is fixedly installed between the two sets of fan blades (1203), and the output shaft ends of the lantern ring (1206) and the second motor (1202) are fixedly connected through a flat key.
7. The protection mechanism for laser cutting production according to claim 1, characterized in that: an output shaft end of the electric push rod (1204) is fixedly provided with a joint (1207), the joint (1207) is fixedly arranged on the upper surface of the connecting plate (1201), and the electric push rod (1204) is fixedly arranged on one side of the outer portion of the protective cover (4).
8. The protection mechanism for laser cutting production according to claim 1, characterized in that: two sets of splint (303) are installed in fixed plate (302) slidable, through second spring (304) fixed connection between splint (303) and fixed plate (302).
9. The protection mechanism for laser cutting production according to claim 1, characterized in that: one side of the protective cover (4) is provided with through holes (403) at the penetrating positions of the two groups of air suction pipes (8).
CN201911352750.4A 2019-12-25 2019-12-25 Protection mechanism is used in laser cutting production Pending CN111014979A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911352750.4A CN111014979A (en) 2019-12-25 2019-12-25 Protection mechanism is used in laser cutting production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911352750.4A CN111014979A (en) 2019-12-25 2019-12-25 Protection mechanism is used in laser cutting production

Publications (1)

Publication Number Publication Date
CN111014979A true CN111014979A (en) 2020-04-17

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CN201911352750.4A Pending CN111014979A (en) 2019-12-25 2019-12-25 Protection mechanism is used in laser cutting production

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Country Link
CN (1) CN111014979A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112008261A (en) * 2020-08-26 2020-12-01 深圳市浩创盛科技有限公司 Laser drilling machine
CN112317971A (en) * 2020-09-29 2021-02-05 齐利伟 Laser cutting device is used in stainless steel processing
CN112809198A (en) * 2020-12-31 2021-05-18 危桂花 Photovoltaic panel production equipment for new energy power generation and production method thereof
CN113059286A (en) * 2021-04-21 2021-07-02 济南金威刻科技发展有限公司 Numerical control laser cutting control system for pole piece of power battery
CN114619154A (en) * 2022-03-31 2022-06-14 云南铁汉钢结构工程有限公司 Numerical control automatic optical fiber laser cutting machine capable of discharging smoke
CN115302149A (en) * 2022-10-11 2022-11-08 图林科技(深圳)有限公司 Welding maintenance equipment for communication equipment maintenance

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120298649A1 (en) * 2011-05-25 2012-11-29 Sugino Machine Limited Laser machining apparatus
CN103737183A (en) * 2013-12-26 2014-04-23 广东大族粤铭激光科技股份有限公司 Laser cutting machine with up and down exhaust system
CN104972227A (en) * 2015-06-29 2015-10-14 宁德时代新能源科技有限公司 Laser continuous cutting device having dedusting function
CN207155009U (en) * 2017-09-27 2018-03-30 湖北敏丰机电设备有限公司 A kind of laser cutting machine tool high effect dust cleaner
CN207788001U (en) * 2017-12-30 2018-08-31 诸暨企创网络科技有限公司 A kind of NC laser cutting device
CN208592505U (en) * 2018-07-17 2019-03-12 漳州龙文区炼盛合信息技术有限公司 A kind of safe and healthy laser welding apparatus
CN110125539A (en) * 2019-06-18 2019-08-16 京东方科技集团股份有限公司 Dust arrester and laser cutting device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120298649A1 (en) * 2011-05-25 2012-11-29 Sugino Machine Limited Laser machining apparatus
CN103737183A (en) * 2013-12-26 2014-04-23 广东大族粤铭激光科技股份有限公司 Laser cutting machine with up and down exhaust system
CN104972227A (en) * 2015-06-29 2015-10-14 宁德时代新能源科技有限公司 Laser continuous cutting device having dedusting function
CN207155009U (en) * 2017-09-27 2018-03-30 湖北敏丰机电设备有限公司 A kind of laser cutting machine tool high effect dust cleaner
CN207788001U (en) * 2017-12-30 2018-08-31 诸暨企创网络科技有限公司 A kind of NC laser cutting device
CN208592505U (en) * 2018-07-17 2019-03-12 漳州龙文区炼盛合信息技术有限公司 A kind of safe and healthy laser welding apparatus
CN110125539A (en) * 2019-06-18 2019-08-16 京东方科技集团股份有限公司 Dust arrester and laser cutting device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112008261A (en) * 2020-08-26 2020-12-01 深圳市浩创盛科技有限公司 Laser drilling machine
CN112317971A (en) * 2020-09-29 2021-02-05 齐利伟 Laser cutting device is used in stainless steel processing
CN112809198A (en) * 2020-12-31 2021-05-18 危桂花 Photovoltaic panel production equipment for new energy power generation and production method thereof
CN113059286A (en) * 2021-04-21 2021-07-02 济南金威刻科技发展有限公司 Numerical control laser cutting control system for pole piece of power battery
CN114619154A (en) * 2022-03-31 2022-06-14 云南铁汉钢结构工程有限公司 Numerical control automatic optical fiber laser cutting machine capable of discharging smoke
CN115302149A (en) * 2022-10-11 2022-11-08 图林科技(深圳)有限公司 Welding maintenance equipment for communication equipment maintenance
CN115302149B (en) * 2022-10-11 2023-09-29 重庆电讯职业学院 Welding maintenance equipment for communication equipment maintenance

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Application publication date: 20200417

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