CN110977235A - Steel pipe installing support welding equipment - Google Patents
Steel pipe installing support welding equipment Download PDFInfo
- Publication number
- CN110977235A CN110977235A CN202010041289.7A CN202010041289A CN110977235A CN 110977235 A CN110977235 A CN 110977235A CN 202010041289 A CN202010041289 A CN 202010041289A CN 110977235 A CN110977235 A CN 110977235A
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- China
- Prior art keywords
- steel pipe
- welding
- automatic
- mounting bracket
- material loading
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0533—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor external pipe alignment clamps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a welding device for a steel pipe mounting bracket, which comprises a welding machine power supply, a feeding machine arm, a welding robot arm, a receiving platform bracket, a robot arm mounting rail and an automatic material arranging machine, wherein a rotary welding platform is rotatably mounted at the upper end of the receiving platform bracket through a rotary motor, a steel pipe fixing cylinder and a steel pipe downward pressing fixing cylinder are fixedly arranged on the rotary welding platform, and the output ends of the steel pipe fixing cylinder and the steel pipe downward pressing fixing cylinder are fixedly connected with clamping plates. The invention relates to welding equipment, in particular to steel pipe mounting bracket welding equipment, and belongs to the technical field of steel pipe bracket welding. According to the automatic steel pipe feeding and welding machine, the steel pipe is automatically fed through the steel pipe clamping claw, the steel pipe is turned through the rotary welding table, the feeding machine arm is matched with the welding robot arm, the two sides of the steel pipe are turned and welded on the upper support, the purposes of automatic feeding and automatic turning are achieved, the production efficiency is improved, and the automation degree is high.
Description
Technical Field
The invention relates to welding equipment, in particular to steel pipe mounting bracket welding equipment, and belongs to the technical field of steel pipe bracket welding.
Background
Pipeline in the boiler need be at pipeline both sides welding installing support (straight ear) when producing, and traditional technology is through manual welding, and this kind of welding precision is poor, and the product defective rate of production is high, and current welding equipment is when welding the pipeline, and the precision is poor, can't accomplish automatic feeding, and can't overturn the pipeline, can't weld the steel pipe installing support that the pipeline both sides go on automatically, and welding efficiency is low.
Disclosure of Invention
The invention aims to provide a steel pipe mounting bracket welding device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a steel pipe mounting bracket welding device comprises a welding machine power supply, a feeding machine arm, a welding robot arm, a receiving platform bracket, a robot arm mounting rail and an automatic material arranging machine, wherein a rotary welding platform is rotatably mounted at the upper end of the receiving platform bracket through a rotary motor, a steel pipe fixing cylinder and a steel pipe pressing fixing cylinder are fixedly arranged on the rotary welding platform, the output ends of the steel pipe fixing cylinder and the steel pipe pressing fixing cylinder are fixedly connected with clamping plates, more than two steel pipe automatic carrying device mounting brackets are arranged above the rotary welding platform, more than two steel pipe automatic carrying device mounting brackets are horizontally arranged, a movable lifting mechanism is mounted at the lower end of the steel pipe automatic carrying device mounting bracket through a front and back displacement motor, the lifting mechanism linearly moves along the axial direction of the steel pipe automatic carrying device mounting bracket, and a steel pipe clamping claw is fixedly mounted at the lower end of the lifting mechanism, the steel pipe clamping jaw does up-and-down displacement motion through elevating system, the fixed straight tube rollgang that is equipped with in spin welding platform front end, the fixed steel pipe material loading platform that is equipped with in straight tube rollgang the place ahead, the slope setting of steel pipe material loading bench upper end, and slope end fixedly connected with baffle, steel pipe material loading platform lower extreme fixed mounting has more than two pay-off cylinders, pay-off cylinder upper end fixedly connected with material loading U-shaped frame, and material loading U-shaped frame runs through steel pipe material loading platform.
As a preferred technical scheme of the invention, the lower end of the mounting bracket of the automatic steel pipe conveying device is fixedly connected with a front and rear displacement track arranged along the axial direction of the mounting bracket, a front and rear displacement motor is connected with the front and rear displacement track in a sliding manner through a clamping block, a rack is fixedly connected to the side end of the front and rear displacement track, and the output end of the front and rear displacement motor is meshed with the rack.
According to a preferable technical scheme, the lifting mechanism comprises a lifting driving motor fixedly mounted at the side ends of a front displacement motor and a rear displacement motor, the lower end of the lifting driving motor is fixedly connected with a lifting support, a lifting rod is inserted into the lifting support, a lifting slide rail is fixedly arranged at the side end of the lifting rod, a lifting rack arranged along the axial direction of the lifting rod is fixedly arranged at the side end of the lifting rod, the output end of the lifting driving motor is meshed with the lifting rack, a steel pipe clamping claw is fixed at the lower end of the lifting rod through a mounting frame, a driving cylinder is fixedly arranged on the steel pipe clamping claw, and the driving cylinder is connected with one clamping jaw of the steel pipe clamping.
As a preferred technical scheme of the invention, the upper parts of the two ends of the rotary welding table are fixedly connected with balancing weights.
As a preferred technical scheme of the invention, the rotary welding table comprises a support, and guide rollers are rotatably arranged on two sides and the upper end of the support.
As a preferable technical scheme, the feeding device further comprises a steel pipe, the feeding U-shaped frame is arranged on one side of the baffle, and when the output end of the feeding air cylinder is in a retraction state, the feeding U-shaped frame is arranged below the upper end face of the steel pipe feeding table and below the steel pipe.
As a preferred technical scheme, the feeding machine arm, the welding robot arm and the automatic material arranging machine are all fixedly mounted on a robot arm mounting rail, a welding gun is fixedly mounted at the end of the welding robot arm and is connected with a welding machine power supply, and the robot arm mounting rail is arranged at the side end, away from the straight pipe conveying roller way, of the rotary welding table.
As a preferred technical scheme of the invention, a supporting column is fixedly connected below the end head of the mounting bracket of the automatic steel pipe conveying device.
Compared with the prior art, the invention has the beneficial effects that:
according to the automatic steel pipe feeding and welding machine, the steel pipe is automatically fed through the steel pipe clamping claw, the steel pipe is turned through the rotary welding table, the feeding machine arm is matched with the welding robot arm, the two sides of the steel pipe are turned and welded on the upper support, the purposes of automatic feeding and automatic turning are achieved, the production efficiency is improved, and the automation degree is high.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a side view of the present invention;
fig. 4 is a top view of the present invention.
In the figure: 1. a welder power supply; 2. a feeder arm; 3. welding a robot arm; 4. a balancing weight; 5. a straight pipe conveying roller way; 6. a steel pipe feeding platform; 601. a baffle plate; 7. a steel pipe; 8. a feeding U-shaped frame; 801. a feeding cylinder; 9. a steel pipe clamping jaw; 10. rotating the welding table; 101. fixing a cylinder by a steel pipe; 102. the steel pipe is pressed down to fix the cylinder; 11. a connecting table bracket; 12. a rotating electric machine; 13. a track is installed on the robot arm; 14. an automatic material arranging machine; 15. a lifting mechanism; 151. a lifting rod; 152. lifting the slide rail; 153. a lifting support; 154. a lifting drive motor; 155. a lifting rack; 16. mounting a bracket of the automatic steel pipe conveying device; 17. a front and rear displacement motor; 18. a front and rear displacement rail.
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. 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.
Referring to fig. 1-4, the invention provides a steel pipe mounting bracket welding device, comprising a welding machine power supply 1, a feeding machine arm 2, a welding robot arm 3, a receiving platform bracket 11, a robot arm mounting rail 13 and an automatic material arranging machine 14, wherein the upper end of the receiving platform bracket 11 is rotatably provided with a rotary welding platform 10 through a rotary motor 12, the rotary welding platform 10 is fixedly provided with a steel pipe fixing cylinder 101 and a steel pipe downward pressing fixing cylinder 102, the output ends of the steel pipe fixing cylinder 101 and the steel pipe downward pressing fixing cylinder 102 are both fixedly connected with a clamping plate, more than two steel pipe automatic handling device mounting brackets 16 are arranged above the rotary welding platform 10, more than two steel pipe automatic handling device mounting brackets 16 are horizontally arranged, the lower end of the steel pipe automatic handling device mounting bracket 16 is provided with a movable lifting mechanism 15 through a front and back displacement motor 17, and the lifting mechanism 15 makes linear motion along the axial direction of the steel pipe automatic handling, 15 lower extreme fixed mounting of elevating system has steel pipe clamping jaw 9, steel pipe clamping jaw 9 is the up-and-down displacement motion through elevating system 15, the fixed straight tube rollgang 5 that is equipped with in rotary welding platform 10 front end, the fixed steel pipe material loading platform 6 that is equipped with in straight tube rollgang 5 the place ahead, the slope sets up in 6 upper ends of steel pipe material loading platform, and slope end fixedly connected with baffle 601, 6 lower extreme fixed mounting of steel pipe material loading platform have two above material feeding cylinder 801, material feeding cylinder 801 upper end fixedly connected with material loading U-shaped frame 8, and material loading U-shaped frame 8 runs through steel pipe material loading platform 6.
Wherein, the lower extreme fixedly connected with of steel pipe automatic handling device installing support 16 is along its axial setting's front and back displacement track 18, and front and back displacement motor 17 passes through joint piece and front and back displacement track 18 sliding connection, and front and back displacement track 18 side fixedly connected with rack, front and back displacement motor 17 output and rack toothing.
Wherein, elevating system 15 is including the lift driving motor 154 of fixed mounting at front and back displacement motor 17 side, lift driving motor 154 lower extreme fixedly connected with lifting support 153, it has lifter 151 to peg graft on lifting support 153, lifter 151 side is fixed and is equipped with lift slide rail 152, lifter 151 side is fixed and is equipped with along its axial lifting rack 155 that sets up, lift driving motor 154 output and lifting rack 155 mesh, steel pipe clamping jaw 9 passes through the mounting bracket to be fixed at lifter 151 lower extreme, steel pipe clamping jaw 9 is last to be fixed to be equipped with and to drive actuating cylinder, it is connected with one of them clamping jaw of steel pipe clamping jaw 9 to drive actuating cylinder.
Wherein, the upper parts of the two ends of the rotary welding table 10 are fixedly connected with balancing weights 4.
Wherein, spin welding platform 10 includes the support, and the equal rotation in support both sides and upper end are installed the deflector roll.
The feeding device further comprises a steel pipe 7, the feeding U-shaped frame 8 is arranged on one side of the baffle 601, and when the output end of the feeding cylinder 801 is in a retraction state, the feeding U-shaped frame 8 is arranged below the upper end face of the steel pipe feeding table 6 and below the steel pipe 7.
The feeding machine arm 2, the welding machine arm 3 and the automatic material arranging machine 14 are fixedly mounted on the machine arm mounting rail 13, a welding gun is fixedly mounted at the end of the arm of the welding machine arm 3 and is connected with a welding machine power supply 1, and the machine arm mounting rail 13 is arranged at the side end, deviating from the straight pipe conveying roller way 5, of the rotary welding table 10.
Wherein, the support column is fixedly connected below the end head of the mounting bracket 16 of the automatic steel pipe conveying device.
The system also comprises a visual detection and positioning system (composed of detection equipment such as a detection camera).
The working principle of the present invention will be specifically explained below: the steel pipe welding device is characterized by further comprising a control terminal for controlling equipment, wherein the steel pipe 7 is conveyed into the straight pipe conveying roller way 5, the steel pipe is arranged above the steel pipe feeding table 6, the steel pipe 7 to be welded is arranged at the upper end of the steel pipe feeding table 6 and is prevented from sliding off, and the baffle 601 limits the steel pipe; the feeding air cylinder 801 lifts the feeding U-shaped frame 8, and the feeding U-shaped frame 8 is carried away from one steel pipe 7 to move upwards, so that the steel pipe 7 is separated independently; the steel pipe clamping claw 9 is driven by a front and back displacement motor 17 to be placed at the upper end of a steel pipe 7 to be jacked, the steel pipe clamping claw 9 is controlled by a lifting mechanism 15 to move up and down, the steel pipe is lowered to the height of the steel pipe to be jacked, the steel pipe is driven by a cylinder to be clamped, then the steel pipe is lifted by the lifting mechanism 15, the steel pipe is placed above a rotary welding table 10 along the direction of a front and back displacement track 18 by the front and back displacement motor 17 and then is lowered, the steel pipe 7 is placed at the upper end of the rotary welding table 10, the initial position of the rotary welding table 10 is inclined, the steel pipe slides to the output ends of a steel pipe fixing cylinder 101 and a; after the straight lugs (mounting brackets) are arranged by the automatic arranging machine 14, the mounting brackets are clamped by the feeding machine arm 2, the mounting brackets are placed at preset positions of the steel pipes 7 by the feeding machine arm 2 according to the requirements of a preset drawing, the welded state is adjusted, the welding machine arm 3 performs spot welding and fixing on the mounting brackets, the feeding machine arm 2 repeats the action of the mounting brackets, the mounting brackets are displaced to other preset positions for spot welding, after a plurality of mounting brackets are completed, the rotary welding table 10 is driven by the rotary motor 12 to rotate, and the mounting brackets are turned over by 180 degrees to perform welding on the other side; after welding is finished, a vision system tracks and monitors the welding quality in time, and the rotary welding table 10 is turned over again after the requirements are met until the mounting bracket is welded completely; after the steel pipe is qualified by visual inspection, the steel pipe 7 is blanked, and if a defect exists, the steel pipe is automatically marked for subsequent repair.
In conclusion, according to the welding equipment for the steel pipe mounting bracket, the steel pipe 7 is overturned through the rotary welding table 10 by automatically feeding the steel pipe through the steel pipe clamping claw 9, the feeding machine arm 2 is matched with the welding robot arm 3, and the two sides of the steel pipe 7 are overturned and welded to the bracket, so that the purposes of automatic feeding and automatic overturning are achieved, the production efficiency is improved, and the automation degree is high.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a steel pipe installing support welding equipment, includes welding machine power (1), material loading machine arm (2), welding robot arm (3), connects a support (11), robot arm installing track (13) and automatic reason material machine (14), its characterized in that, connect a support (11) upper end to rotate through rotating electrical machines (12) and install rotatory welding bench (10), fixed steel pipe stationary cylinder (101) and the steel pipe of being equipped with on rotatory welding bench (10) push down stationary cylinder (102), the equal fixedly connected with cardboard of steel pipe stationary cylinder (101) and steel pipe push down stationary cylinder (102) output, rotatory welding bench (10) top is equipped with more than two steel pipe automatic handling device installing supports (16), more than two steel pipe automatic handling device installing supports (16) level sets up, mobilizable elevating system (15) are installed through displacement motor (17) around steel pipe automatic handling device installing supports (16) lower extreme ) And elevating system (15) are linear motion along steel pipe automatic handling device installing support (16) axial direction, elevating system (15) lower extreme fixed mounting has steel pipe clamping jaw (9), steel pipe clamping jaw (9) are upper and lower displacement motion through elevating system (15), rotatory welding bench (10) front end is fixed and is equipped with straight tube rollgang (5), straight tube rollgang (5) the fixed steel pipe material loading platform (6) that is equipped with in place ahead, slope setting in steel pipe material loading platform (6) upper end, and slope end fixedly connected with baffle (601), steel pipe material loading platform (6) lower extreme fixed mounting has more than two material conveying cylinder (801), material conveying cylinder (801) upper end fixedly connected with material loading U-shaped frame (8), and material loading U-shaped frame (8) run through steel pipe material loading platform (6).
2. The steel pipe mounting bracket welding equipment of claim 1, wherein: the automatic steel pipe conveying device is characterized in that the lower end of the mounting support (16) of the automatic steel pipe conveying device is fixedly connected with a front displacement track (18) and a rear displacement track (18) which are arranged along the axial direction of the mounting support, the front displacement motor (17) and the rear displacement motor (17) are connected with the front displacement track (18) and the rear displacement track (18) in a sliding mode through clamping blocks, racks are fixedly connected to the side ends of the front displacement track and the rear displacement track (18.
3. The steel pipe mounting bracket welding equipment of claim 1, wherein: elevating system (15) are including fixed mounting in front and back displacement motor (17) lift driving motor (154) of side, lift driving motor (154) lower extreme fixedly connected with lifting support (153), it has lifter (151) to peg graft on lifting support (153), lifter (151) side is fixed and is equipped with lift slide rail (152), lifter (151) side is fixed and is equipped with along its axial lifting rack (155) that set up, lift driving motor (154) output and lifting rack (155) meshing, steel pipe presss from both sides tight claw (9) and fixes at lifter (151) lower extreme through the mounting bracket, steel pipe presss from both sides tight claw (9) and is gone up fixed and is equipped with and drives actuating cylinder, it is connected with one of them clamping jaw of steel pipe clamp claw (9) to drive actuating cylinder.
4. The steel pipe mounting bracket welding equipment of claim 1, wherein: and balancing weights (4) are fixedly connected above two ends of the rotary welding table (10).
5. The steel pipe mounting bracket welding equipment of claim 1, wherein: the rotary welding table (10) comprises a support, and guide rollers are installed on two sides and the upper end of the support in a rotating mode.
6. The steel pipe mounting bracket welding equipment of claim 1, wherein: still include steel pipe (7), baffle (601) one side is arranged in to material loading U-shaped frame (8), works as when pay-off cylinder (801) output is in the state of retracting, steel pipe material loading platform (6) up end below is arranged in to material loading U-shaped frame (8), and arranges steel pipe (7) below in.
7. The steel pipe mounting bracket welding equipment of claim 1, wherein: feeder arm (2), welding machine arm (3) and automatic reason material machine (14) equal fixed mounting are on robot arm mounting rail (13), welding machine arm (3) arm end fixed mounting has welder, and welder is connected with welding machine power (1), the side that rotatory welding bench (10) deviate from straight tube rollgang (5) is arranged in robot arm mounting rail (13).
8. The steel pipe mounting bracket welding equipment of claim 1, wherein: and a support column is fixedly connected below the end head of the steel pipe automatic conveying device mounting bracket (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010041289.7A CN110977235A (en) | 2020-01-15 | 2020-01-15 | Steel pipe installing support welding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010041289.7A CN110977235A (en) | 2020-01-15 | 2020-01-15 | Steel pipe installing support welding equipment |
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| Publication Number | Publication Date |
|---|---|
| CN110977235A true CN110977235A (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010041289.7A Pending CN110977235A (en) | 2020-01-15 | 2020-01-15 | Steel pipe installing support welding equipment |
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| CN (1) | CN110977235A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111545953A (en) * | 2020-04-13 | 2020-08-18 | 深圳市仕达盛峰智能装备有限公司 | Welding, assembling and assisting tool for elevator car bottom robot and welding method |
| CN112719684A (en) * | 2021-02-19 | 2021-04-30 | 黄河水利职业技术学院 | Welding machine vision monitoring device with tracking and positioning functions |
| CN113182720A (en) * | 2021-05-08 | 2021-07-30 | 滨州学院 | Forming robot and forming method for reinforcing back ridge of anti-corrosion aluminum template |
| CN116493724A (en) * | 2023-06-21 | 2023-07-28 | 北京理工大学深圳汽车研究院(电动车辆国家工程实验室深圳研究院) | Magnetic pulse welding equipment |
| CN117548981A (en) * | 2024-01-11 | 2024-02-13 | 陕西建工泾渭钢结构有限公司 | Intelligent welding equipment for steel structure and application method of intelligent welding equipment |
-
2020
- 2020-01-15 CN CN202010041289.7A patent/CN110977235A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111545953A (en) * | 2020-04-13 | 2020-08-18 | 深圳市仕达盛峰智能装备有限公司 | Welding, assembling and assisting tool for elevator car bottom robot and welding method |
| CN112719684A (en) * | 2021-02-19 | 2021-04-30 | 黄河水利职业技术学院 | Welding machine vision monitoring device with tracking and positioning functions |
| CN113182720A (en) * | 2021-05-08 | 2021-07-30 | 滨州学院 | Forming robot and forming method for reinforcing back ridge of anti-corrosion aluminum template |
| CN113182720B (en) * | 2021-05-08 | 2022-06-24 | 滨州学院 | Forming robot and forming method for reinforcing back ridge of anti-corrosion aluminum template |
| CN116493724A (en) * | 2023-06-21 | 2023-07-28 | 北京理工大学深圳汽车研究院(电动车辆国家工程实验室深圳研究院) | Magnetic pulse welding equipment |
| CN116493724B (en) * | 2023-06-21 | 2024-01-09 | 北京理工大学深圳汽车研究院(电动车辆国家工程实验室深圳研究院) | Magnetic pulse welding equipment |
| CN117548981A (en) * | 2024-01-11 | 2024-02-13 | 陕西建工泾渭钢结构有限公司 | Intelligent welding equipment for steel structure and application method of intelligent welding equipment |
| CN117548981B (en) * | 2024-01-11 | 2024-03-22 | 陕西建工泾渭钢结构有限公司 | Intelligent welding equipment for steel structure and application method of intelligent welding equipment |
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