CN107978658B - Bus bar bending device and bus bar welding equipment - Google Patents
Bus bar bending device and bus bar welding equipment Download PDFInfo
- Publication number
- CN107978658B CN107978658B CN201711420712.9A CN201711420712A CN107978658B CN 107978658 B CN107978658 B CN 107978658B CN 201711420712 A CN201711420712 A CN 201711420712A CN 107978658 B CN107978658 B CN 107978658B
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- bus bar
- bending
- cylinder
- ejection
- bending device
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- 238000005452 bending Methods 0.000 title claims abstract description 91
- 238000003466 welding Methods 0.000 title claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 20
- 238000007665 sagging Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a bus bar bending device and bus bar welding equipment, wherein the bus bar bending device comprises a storage structure, an ejection structure and a rotating structure, a channel for storing bus bars is arranged on the storage structure, a part of the bus bars to be bent is suspended outside the storage structure, the rotating structure comprises a rotating cylinder and a lower pressing plate, the rotating cylinder drives the lower pressing plate to rotate and press down so as to press down the suspended bus bar part, and the ejection structure is arranged corresponding to the bus bar suspended part so as to push the bus bars to be pressed down to form an L shape. The invention also provides bus bar welding equipment which comprises the bus bar bending device. According to the invention, through the mutual matching of the storage structure, the ejection structure and the rotating structure, the sagging, overturning and forming of the bus bar are automatically realized, the working efficiency is greatly improved, the labor intensity is reduced, and the bending quality and the yield of the bus bar are improved.
Description
Technical Field
The present invention relates generally to the field of photovoltaic cell assembly production, and in particular to a device for bending a busbar and an apparatus for welding the busbar.
Background
At present, the demand of the photovoltaic cell assembly is larger and larger, and in the production process of the photovoltaic cell assembly, the bus bar needs to be bent into an L shape so as to be used in the subsequent process. At present, the bending is performed manually, the accuracy is low, the working efficiency is low, the labor intensity is improved, and the production cost is improved.
Therefore, how to realize automatic bus bar bending operation, thereby improving the overall production rhythm is a problem which is urgently needed to be solved in the industry.
Disclosure of Invention
It is a primary object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a busbar bending device that enables automated busbar bending operations.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the utility model provides a busbar bending device, busbar bending device is including depositing structure, ejector structure and revolution mechanic, it is provided with the passageway that is used for depositing the busbar to deposit the structure on, the busbar need bend the part overhang in deposit outside the structure, revolution mechanic includes revolving cylinder and holding down plate, the revolving cylinder drive the rotatory push down of holding down plate to with the busbar part of overhanging push down, ejector structure corresponds busbar overhang portion setting, with push away the busbar by the push down part and make the busbar form L shape.
According to an embodiment of the present invention, the busbar bending device further includes a bending plate, and the bending plate is disposed at an overhanging end of the storage structure, so as to bend the busbar in cooperation with the lower pressing plate.
According to an embodiment of the invention, the bending plate is connected with a feeding cylinder, and the feeding cylinder drives the bending plate to move.
According to one embodiment of the invention, the lower pressing plate is provided with a configuration groove and a flange, the flange is arranged at the terminal end of the configuration groove, and when the configuration groove is matched with the bending plate to buckle the bus bar, the flange presses and bends the overhanging part of the bus bar downwards.
According to one embodiment of the invention, the lower pressing plate is further provided with a bending groove, the bottom surface of the groove is provided with a bending groove, the pushing structure comprises a pushing cylinder and a pushing block, the cylinder body of the pushing cylinder is fixedly arranged, a piston rod is connected with the pushing block, the pushing block is provided with a protrusion, and the protrusion is used for pushing the hanging part of the sagging bus bar into the bending groove.
According to one embodiment of the invention, the storage structure is provided with a guide post, and the lower pressing plate is provided with a guide hole, and the guide hole is matched with the guide post for positioning.
According to an embodiment of the invention, the channel is a groove or a channel.
According to an embodiment of the present invention, the bus bar bending device further includes a jack-up structure, and the jack-up structure is used for pushing the bus bar out of the storage structure.
According to one embodiment of the invention, the jacking structure comprises a jacking cylinder, and a piston rod of the jacking cylinder abuts against the bending part of the bus bar.
In order to achieve the above purpose, the present invention further adopts the following technical scheme:
a busbar welding device comprising a busbar bending device as described above.
According to the technical scheme, the bus bar bending device and the bus bar welding equipment have the advantages that:
according to the invention, through the mutual matching of the storage structure, the ejection structure and the rotating structure, the sagging, overturning and forming of the bus bar are automatically realized, the working efficiency is greatly improved, the labor intensity is reduced, and the bending quality and the yield of the bus bar are improved.
Drawings
Various objects, features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the invention, when taken in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the invention and are not necessarily drawn to scale. In the drawings, like reference numerals refer to the same or similar parts throughout. Wherein:
FIG. 1 is a schematic perspective view of an embodiment of a bus bar bending device according to the present invention;
FIG. 2 is a schematic plan view of an embodiment of a bus bar bending device according to the present invention;
FIG. 3 is a schematic perspective view of a storage structure of an embodiment of a bus bar bending device according to the present invention;
FIG. 4 is a schematic perspective view of a rotating structure of an embodiment of a bus bar bending device according to the present invention;
FIG. 5 is a schematic bottom view of a rotating structure of an embodiment of a bus bar bending device according to the present invention;
FIG. 6 is a schematic view of an installation structure of a bending plate in an embodiment of a bus bar bending device according to the present invention;
fig. 7 is a schematic perspective view of an ejector structure in an embodiment of a bus bar bending device according to the present invention.
Wherein reference numerals are as follows:
1. a storage structure; 10. a storage rack; 11. a strip-shaped table; 12. a clamping column; 13. a clamping path; 14. a guide post; 2. a push structure; 20. pushing the top frame; 21. pushing the cylinder; 22. a top block; 221. a protrusion; 3. a rotating structure; 31. a rotary cylinder; 32. a lower pressing plate; 321. a configuration groove; 322. a flange; 323. a bending groove; 324. A guide hole; 40. a feeding frame; 41. a bending plate; 411 locating edges; 412. bending openings; 42. feeding the cylinder.
Description of the embodiments
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.
In the following description of different examples of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration different exemplary structures, systems, and steps in which aspects of the invention may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "top," "bottom," "front," "rear," "side," and the like may be used herein to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., according to the orientation of the examples depicted in the figures. Nothing in this specification should be construed as requiring a particular three-dimensional orientation of the structure in order to fall within the scope of the invention.
The bus bar bending device is used for automatically bending the bus bar into an L shape, storing the bus bar by using the storing structure, pressing the overhanging part of the bus bar in the storing structure to droop by using the rotating structure, bending the bus bar in place by using the pushing structure, and improving the working efficiency in the whole process of automatic operation.
The following description will be made with reference to an example of practical application of the present invention, but the specific structure of this example should not be taken as limiting the scope of the present invention.
Fig. 1 is a schematic perspective view of an embodiment of a bus bar bending device according to the present invention. Fig. 2 is a schematic plan view of an embodiment of a bus bar bending device according to the present invention. As shown in fig. 1 and 2, in this embodiment, the bus bar bending device mainly includes a storage structure 1, a rotating structure 3, a bending plate 41, a push-up structure 2, and a push-up structure (not shown in the drawings). The storage structure 1 is used for storing bus bars and enabling the bus bars to be partially overhanging, the rotating structure 3 is used for pressing the overhanging portion of the bus bars to droop, the bending plate 41 is matched with the rotating structure to act, the ejection structure 2 is used for bending the sagging bus bars back to the rotating structure 3 to form an L shape, and the ejection structure is used for automatically ejecting the bent bus bars to the storage structure 1.
Fig. 3 is a schematic perspective view of a storage structure of an embodiment of a bus bar bending device according to the present invention. As shown in fig. 3, in this embodiment, the storage structure 1 includes a storage rack 10, a bar-shaped table 11, a clip column 12, a clip channel 13, and a guide column 14. The storage rack 10 is fixedly arranged and is of a supporting structure, the strip-shaped table 11 is a strip-shaped platform and is arranged above the storage rack 10, two rows of clamping columns 12 which are arranged in parallel are arranged on the strip-shaped table 11, a clamping channel 13 is formed between the two rows of clamping columns 12, and bus bars are placed in the clamping channel 13. The structure for storing the bus bar is not limited to the above structure, and may be realized by forming a groove for the bus bar on the upper portion of the bar table 11. The guide post 14 may be directly mounted on one side of the bar-shaped table, or may be disposed on a mounting block as shown in the drawing, or may be disposed on a frame separately, which serves to position and guide the rotating structure 3.
FIG. 4 is a schematic perspective view of a rotating structure of an embodiment of a bus bar bending device according to the present invention; fig. 5 is a schematic bottom view of a rotating structure of the bus bar bending device according to an embodiment of the invention. As shown in fig. 4 and 5, in this embodiment, the rotary structure 3 includes a rotary cylinder 31 and a lower pressure plate 32. The rotary cylinder 31 is fixedly arranged and can be independently arranged on a frame body or can be arranged on the same frame body together with the ejection structure 2. The lower pressure plate 32 is connected to the piston rod of the rotary cylinder 31, and the lower pressure plate 32 includes an arrangement groove 321, a flange 322, a bending groove 323, and a guide hole 324. The portion of the bus bar that is overhanging the storage structure 1 is configured with the slot 321, which may be a step slot or a bar slot, and is shown in the figure. The ribs 322 are located at the ends of the deployment slot and protrude below the deployment slot to rest against the bus bar such that the bus bar overhang hangs down. The bending groove 323 extends in a direction perpendicular to the extending direction of the arrangement groove and is matched with the push-up structure 2 so as to bend the bus bar into an L shape. Guide holes 324 are through holes or blind holes and cooperate with guide posts 14 to provide accurate pressing positions of lower platen 32. In this embodiment, the rotation angle of the rotary cylinder 31 is 90 degrees, and a specific rotation angle stroke is not limited as long as it can be satisfied in practice.
Fig. 6 is a schematic view of an installation structure of a bending plate in an embodiment of the bus bar bending device of the present invention. As shown in fig. 6, in this embodiment, the bending plate 41 is connected to a feed cylinder 42 and mounted on the feed frame 40 together with the feed cylinder 42, and the feed cylinder 42 pushes the bending plate 41 to move in the horizontal direction of the feed frame 40. In this embodiment, the bending plate 31 includes a positioning edge 411 and a bending opening 412. Wherein the positioning edge 411 is positioned in cooperation with the inner wall of the flange 322, and the bus bar overhanging portion is clamped between the bending plate 41 and the lower pressing plate 32. The bent opening 412 has a notch structure so that the overhanging portion of the bus bar clamped therein hangs down therefrom. In this embodiment, the bending port 412 is a wedge-shaped port, and may be an arc-shaped port.
Fig. 7 is a schematic perspective view of an ejector structure in an embodiment of a bus bar bending device according to the present invention. In this embodiment, as shown in fig. 7, the ejector structure 2 includes an ejector frame 20, an ejector cylinder 21, and an ejector block 22. The ejector frame 20 is fixedly arranged, the ejector cylinder 21 is fixedly arranged at the upper part of the ejector frame 20, and the ejector block 22 is connected with a piston rod of the ejector cylinder 21 and moves along with the piston rod. In this embodiment, the top block 22 is provided with a protrusion 221, and the protrusion 221 may cooperate with a bending groove 323 to press the bent portion of the bus bar into place when pushed in, so that the bent portion of the bus bar is on the same plane as the straight portion. The shape of the protrusion 221 and the bending groove 323 may be rectangular as shown, or may be arc-shaped, polygonal, etc.
In this embodiment, a jack-up structure (not shown) is used to jack up the bus bar, which completes the bending operation, out of the storage structure 1. In this embodiment, the jack-up structure includes a jack-up cylinder, and a piston rod of the jack-up cylinder abuts against a bent portion of the bus bar, or a position where the bent portion and the straight portion are close to the bent portion.
The course of action of this embodiment is as follows:
the bus bar is first placed in the clip channel 13 with the portion to be bent overhanging it. The placing process can be completed by manipulator operation or can be directly carried out by feeding process. Then, the bending plate 41 is protruded forward by the feed cylinder 42 and placed under the bus bar overhanging portion, and one side of the bending plate 41 is connected with the bar-shaped table in a mating manner. After the bending plate 41 is in place, the rotary cylinder 31 acts to drive the lower pressing plate 32 to turn over and press down, and the lower pressing process is matched and positioned with the guide hole 34 through the guide post 14, so that the inner wall of the flange 322 is close to the positioning edge 411 when in place, and the bus bar is pressed down and penetrates out from the bending opening 412 in the gradual lower pressing process of the lower pressing plate 32 to be basically vertical. After the bus bar is automatically depressed, the bending plate 41 is withdrawn. After the bending plate 41 is withdrawn, the push cylinder 21 pushes the top block 22 forward and pushes the downward portion of the bus bar to tilt upward toward the horizontal plane until the protrusion 221 of the top block 22 is completely engaged with the bending groove 323 on the lower pressure plate 32, at which time the bus bar is completely bent into an L-shaped structure on the horizontal plane, and the bending portion has a triangular overlapping area. After the bus bar is bent, the top block 22 is retracted, and the lower platen 32 is reset. Finally, the jacking structure acts to jack the bent bus bars out of the clamp channels 13, and the bus bars are taken away by a manipulator and the like to enter the next flow.
In addition, the invention also provides bus bar welding equipment. The bus bar welding equipment is used for welding the bus bars and comprises the bus bar bending device, so that the bus bars are bent before welding is realized. Other structures of the bus bar welding apparatus are not discussed in detail herein.
It will be appreciated by persons skilled in the art that the particular structures and processes shown in the above detailed description are illustrative only and not limiting. Moreover, those skilled in the art to which the invention pertains will appreciate that various features described above may be combined in any number of possible ways to form new embodiments, or that other modifications are within the scope of the invention.
Claims (6)
1. The bus bar bending device is characterized by comprising a storage structure, an ejection structure and a rotating structure, wherein a channel for storing bus bars is arranged on the storage structure, a part of the bus bars to be bent is overhanging out of the storage structure, the rotating structure comprises a rotating cylinder and a lower pressing plate, the rotating cylinder drives the lower pressing plate to rotate and press down so as to press down the overhanging bus bar part, and the ejection structure is arranged corresponding to the bus bar overhanging part so as to push against the bus bar pressed down part to enable the bus bars to form an L shape;
the bus bar bending device further comprises a bending plate, the bending plate is arranged at the overhanging end of the storage structure and is matched with the lower pressing plate to bend the bus bar, the bending plate is connected with a feeding cylinder, the feeding cylinder drives the bending plate to move, a configuration groove and a flange are arranged on the lower pressing plate, the flange is arranged at the terminal of the configuration groove, when the configuration groove is matched with the bending plate to buckle the bus bar, the flange presses and bends the overhanging part of the bus bar downwards, a bending groove is further arranged on the lower pressing plate, a bending groove is formed in the bottom surface of the configuration groove, the pushing structure comprises a pushing cylinder and a pushing block, a cylinder body of the pushing cylinder is fixedly arranged, a piston rod is connected with the pushing block, a bulge is arranged on the pushing block, and the bulge is used for pushing the overhanging part of the sagging bus bar into the bending groove;
the storage structure comprises a storage rack, a strip-shaped table, clamping columns, a clamping channel and a guide column, wherein the storage rack is fixedly arranged and is a supporting structure, the strip-shaped table is a strip-shaped platform and is arranged above the storage rack, two rows of clamping columns which are arranged in parallel are arranged on the strip-shaped table, the part between the two rows of clamping columns forms the clamping channel, and the bus bar is placed in the clamping channel; the ejection structure comprises an ejection frame, an ejection cylinder and an ejection block, wherein the ejection frame is fixedly arranged, the ejection cylinder is fixedly arranged on the upper part of the ejection frame, and the ejection block is connected with a piston rod of the ejection cylinder and moves along with the piston rod; the top block is provided with a bulge, and the bulge is matched with the bending groove when being pushed in, so that the bending part of the bus bar is pressed in place, and the bending part of the bus bar and the linear part are on the same plane.
2. The bus bar bending device as set forth in claim 1, wherein the storage structure is provided with a guide post, and the lower pressure plate is provided with a guide hole, and the guide hole is positioned in cooperation with the guide post.
3. The bus bar bending device of claim 1, wherein the channel is a groove or a channel.
4. The bus bar bending device of claim 1, further comprising a jacking structure for jacking the bus bars out of the storage structure.
5. The bus bar bending device of claim 4, wherein the jacking structure comprises a jacking cylinder, a piston rod of the jacking cylinder abutting against the bend of the bus bar.
6. Bus bar welding apparatus comprising a bus bar bending device according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711420712.9A CN107978658B (en) | 2017-12-25 | 2017-12-25 | Bus bar bending device and bus bar welding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711420712.9A CN107978658B (en) | 2017-12-25 | 2017-12-25 | Bus bar bending device and bus bar welding equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107978658A CN107978658A (en) | 2018-05-01 |
| CN107978658B true CN107978658B (en) | 2024-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711420712.9A Active CN107978658B (en) | 2017-12-25 | 2017-12-25 | Bus bar bending device and bus bar welding equipment |
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| Country | Link |
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| CN (1) | CN107978658B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108723242A (en) * | 2018-05-04 | 2018-11-02 | 苏州沃特维自动化系统有限公司 | Apparatus for bending for the welding lead that converges |
| CN109202325B (en) * | 2018-11-06 | 2021-06-01 | 苏州德睿联自动化科技有限公司 | Battery string lead and bus bar interconnection device and interconnection process |
| CN109434332B (en) * | 2018-12-05 | 2023-12-01 | 宁夏小牛自动化设备股份有限公司 | Accurate busbar joining device, busbar joining preparation device, welding machine and ribbon joining method |
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| CN202137238U (en) * | 2011-06-15 | 2012-02-08 | 阿特斯(中国)投资有限公司 | Bending tool for busbar |
| WO2012056714A1 (en) * | 2010-10-29 | 2012-05-03 | Nidec Corporation | Bus bar, motor, and process for producing these |
| CN204799801U (en) * | 2015-07-16 | 2015-11-25 | 浙江昱辉阳光能源江苏有限公司 | Busbar bending device |
| CN105436262A (en) * | 2015-12-31 | 2016-03-30 | 苏州博阳能源设备有限公司 | Bus bar bending device with feeding mechanism |
| CN106077174A (en) * | 2016-07-01 | 2016-11-09 | 无锡先导智能装备股份有限公司 | A kind of busbar automatic bending device |
| KR101773840B1 (en) * | 2017-03-15 | 2017-09-01 | 박선용 | Automatic busbar bending machine |
| CN207967021U (en) * | 2017-12-25 | 2018-10-12 | 无锡奥特维科技股份有限公司 | Busbar apparatus for bending and busbar welding equipment |
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2017
- 2017-12-25 CN CN201711420712.9A patent/CN107978658B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012056714A1 (en) * | 2010-10-29 | 2012-05-03 | Nidec Corporation | Bus bar, motor, and process for producing these |
| CN202137238U (en) * | 2011-06-15 | 2012-02-08 | 阿特斯(中国)投资有限公司 | Bending tool for busbar |
| CN204799801U (en) * | 2015-07-16 | 2015-11-25 | 浙江昱辉阳光能源江苏有限公司 | Busbar bending device |
| CN105436262A (en) * | 2015-12-31 | 2016-03-30 | 苏州博阳能源设备有限公司 | Bus bar bending device with feeding mechanism |
| CN106077174A (en) * | 2016-07-01 | 2016-11-09 | 无锡先导智能装备股份有限公司 | A kind of busbar automatic bending device |
| KR101773840B1 (en) * | 2017-03-15 | 2017-09-01 | 박선용 | Automatic busbar bending machine |
| CN207967021U (en) * | 2017-12-25 | 2018-10-12 | 无锡奥特维科技股份有限公司 | Busbar apparatus for bending and busbar welding equipment |
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| CN107978658A (en) | 2018-05-01 |
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