CN106975840B - A kind of bonding machine - Google Patents
A kind of bonding machine Download PDFInfo
- Publication number
- CN106975840B CN106975840B CN201710383555.2A CN201710383555A CN106975840B CN 106975840 B CN106975840 B CN 106975840B CN 201710383555 A CN201710383555 A CN 201710383555A CN 106975840 B CN106975840 B CN 106975840B
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- Prior art keywords
- welding
- rotating ball
- transverse arm
- pedestal
- bonding machine
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Classifications
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0823—Devices involving rotation of the workpiece
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention belongs to electrical engineering technical fields, more particularly, to a kind of bonding machine.Including pedestal, pedestal is connected by support column with transverse arm, welding space is formed between transverse arm and pedestal, level slidably connects welding headstock on transverse arm, the lower face for welding headstock is equipped with several laser welding heads, welding headstock connects with the horizontal drive cylinders that welding headstock can be driven to move horizontally, it is connected for longitudinal sliding motion between support column and transverse arm, transverse arm connects with the zigzag tread patterns cylinders that transverse arm can be driven to vertically move, it is characterized in that, locating rack is vacantly provided between transverse arm and pedestal, hollow open is provided on locating rack, the rotating ball placed for welding workpiece is provided in hollow open, rotating ball is rotatablely connected with locating rack.Advantage is：The time for having saved processing also saves manpower, reduces production cost to improve the efficiency of welding.
Description
Technical field
The invention belongs to electrical engineering technical fields, more particularly, to a kind of bonding machine.
Background technology
Welding is a kind of jointing metal in a manner of heating, high temperature or high pressure or other thermoplastic materials (such as plastics)
Manufacturing process and technology.Bonding machine in the prior art is designed generally be directed to big workpiece, can be realized using rotating welding
Indefinite spot welding can realize the welding of multiple points according to the actual demand of workpiece.Patent document [CN201510773028.3]
Disclose a kind of automation small workpiece welder, including body, plumb joint, rotary table, the first driving cylinder and second
Cylinder is driven, a crossbeam is installed on body, crossbeam both ends are connected with rail plate vertically, horizontal between two rail plates
One vertical displacement beam is installed, the outside of each rail plate is mounted on protective cover, and plumb joint is arranged on vertical displacement beam,
The lower section of plumb joint is equipped with a rotary table, and rotary table is mounted on body, and driving rotary work is provided in body
The first of platform drives cylinder, and the second driving cylinder of driving vertical displacement beam movement is additionally provided on body.This kind of welding manner
User is needed after welding to remove welding workpiece one by one, and the working face that welding workpiece is placed is horizontal plane, it can
The welding workpiece quantity of placement is relatively limited, and production efficiency is relatively low.
Invention content
Regarding the issue above, the present invention provides a kind of reasonable design, bonding machine simple in structure.
In order to achieve the above objectives, present invention employs following technical proposals：This bonding machine includes pedestal, and the pedestal is logical
It crosses support column with transverse arm to be connected, forms welding space between the transverse arm and pedestal, level slides company on the transverse arm
Be connected to welding headstock, the lower face of the welding headstock is equipped with several laser welding heads, the welding headstock with can
The horizontal drive cylinders that driving welding headstock moves horizontally connect, and connect for longitudinal sliding motion between the support column and transverse arm
It connects, the transverse arm connects with the zigzag tread patterns cylinders that transverse arm can be driven to vertically move, which is characterized in that the transverse arm
It is vacantly provided with locating rack between pedestal, hollow open is provided on the locating rack, is provided in the hollow open
For the rotating ball that welding workpiece is placed, the rotating ball is rotatablely connected with locating rack, and as the Welder being located in rotating ball
Part with rotating ball turn to top when laser welding head welding workpiece is welded, when the welding workpiece in rotating ball with
Welding workpiece is fallen from rotating ball when rotating ball turns to lower section.
In above-mentioned bonding machine, the rotating ball is rotatablely connected by shaft and locating rack, the rotating ball
The collecting box of the welding workpiece fallen can be received by being equipped between lower part and pedestal, and the upper end of the collecting box is open, described
Rotating ball with can drive rotating ball rotate driving motor be connected.
In above-mentioned bonding machine, the collecting box is slidably connected with pedestal, and the pedestal is equipped with sliding rail, institute
The bottom for the collecting box stated, which is equipped with, to be connect with the sliding matched sliding groove of rail, the collecting box with pedestal driving cylinders.
In above-mentioned bonding machine, the locating rack passes through supporting rack and the welding that can will rotate into rotating ball bottom
The baffle that workpiece scrapes is connected, and the supporting rack includes being arranged in rotating ball both sides and the supporting rod that is vertically arranged, described
Supporting rod lower end between be equipped with locating rod, the baffle and locating rod are rotatablely connected, and are set between baffle and locating rod
There are preloading spring, the preload direction of the preloading spring opposite with the rotation direction of rotating ball.
In above-mentioned bonding machine, the locating rod is equipped with the limiting plate that limitation baffle is rotated to side, described
Preloading spring is arranged between limiting plate and baffle.
In above-mentioned bonding machine, the rotating ball is equipped with several mounting grooves, the depth of the mounting groove along
The rotation direction of rotating ball gradually deepens.
In above-mentioned bonding machine, the welding headstock is rotatablely connected by rotating strut with hemisphere arc plate, hemisphere arc
Plate is matched with rotating ball, spacing is equipped between the hemisphere arc plate and rotating ball, laser welding head setting is half
On the madial wall of ball arc plate, the hemisphere arc plate is connected with the driving motor that hemisphere arc plate can be driven to rotate.
In above-mentioned bonding machine, half arc bracket, the half arc branch are fixedly connected on the welding headstock
The madial wall of frame and the lateral wall of hemisphere arc plate are slidably connected, the plane where half arc bracket and hemisphere arc plate place
Plane it is perpendicular, half arc bracket and hemisphere arc plate have the same center of circle, and the hemisphere arc plate can be along half arc branch
Frame is circumferentially rotated with the center of circle.
Compared with prior art, it is the advantages of this bonding machine：This bonding machine carries out welding workpiece using rotating ball
Installation, significantly increase surface can mounting area, the welding workpiece quantity that can be installed is more compared with horizontal mounting plate, and rotating ball turn
It moves to welding workpiece when lower section and is fallen from rotating ball, do not need staff and take welding workpiece one by one after welding
Under, the time for having saved processing also saves manpower, reduces production cost to improve the efficiency of welding.
Description of the drawings
Fig. 1 is overall structure diagram provided by the invention；
Fig. 2 is the structural schematic diagram of rotating ball provided by the invention；
Fig. 3 is the sectional view of rotation ball portion provided by the invention；
Fig. 4 is partial enlarged view provided by the invention；
Fig. 5 is the vertical view of locating rack provided by the invention；
Fig. 6 is the sectional view provided by the invention for collecting box part.
In figure, pedestal 1, support column 2, transverse arm 3, welding space 4, welding headstock 6, laser welding head 7, horizontal drive cylinder
8, zigzag tread patterns cylinder 9, shaft 10, collecting box 11, sliding rail 12, sliding groove 13, pedestal driving cylinder 14, supporting rack 15, gear
Plate 16, supporting rod 17, locating rod 18, preloading spring 19, driving motor 20, limiting plate 21, mounting groove 22, rotation strut 23, half
Ball arc plate 24, half arc bracket 25, locating rack 26, hollow open 27, rotating ball 28, welding workpiece 29.
Specific implementation mode
Following embodiment only exists in illustrative purpose, is limited the scope of the invention without being intended to.
Embodiment
As shown in figures 1 to 6, this bonding machine includes pedestal 1, and pedestal 1 is connected by support column 2 with transverse arm 3, transverse arm 3 and bottom
Welding space 4 is formed between seat 1, level slidably connects welding headstock 6 on transverse arm 3, if the lower face of welding headstock 6 is equipped with
Dry laser welding head 7, welding headstock 6 are connected with the horizontal drive cylinder 8 that welding headstock 6 can be driven to move horizontally, support
It is connected for longitudinal sliding motion between column 2 and transverse arm 3, transverse arm 3 is connected with the zigzag tread patterns cylinder 9 that transverse arm 3 can be driven to vertically move
It connects, locating rack 26 is vacantly provided between transverse arm 3 and pedestal 1, hollow open 27 is provided on locating rack 26, is set in hollow open 27
It is equipped with the rotating ball 28 placed for welding workpiece 29, rotating ball 28 is rotatablely connected with locating rack 26, and when in rotating ball 28
Welding workpiece 29 with rotating ball 28 turn to top when laser welding head 7 welding workpiece 29 is welded, when positioned at rotation
Welding workpiece 29 is fallen from rotating ball 28 when welding workpiece 29 on ball 28 turns to lower section with rotating ball 28.
Common bonding machine is that welding workpiece 29 is placed on pedestal 1, or is placed on horizontal mounting plate, passes through shifting
Dynamic laser welding head 7 welds welding workpiece 29, this kind of welding manner needs user after welding by welding workpiece 29
It removes one by one, and horizontal mounting plate is plane, 29 quantity of welding workpiece that can be placed is relatively limited, this bonding machine uses
Rotating ball 28 installs welding workpiece 29, significantly increase surface can mounting area, the welding workpiece 29 that can install counts
Amount it is more compared with horizontal mounting plate, and rotating ball 28 turn to lower section when welding workpiece 29 fallen from rotating ball 28, do not need work
Personnel remove welding workpiece 29 after welding one by one, have saved the time of processing, to improve the efficiency of welding,
Manpower is also saved, production cost is reduced.
Wherein, rotating ball 28 is rotatablely connected by shaft 10 and locating rack 26, is set between the lower part and pedestal 1 of rotating ball 28
The collecting box 11 of the welding workpiece 29 fallen can be received by having, and the upper end of collecting box 11 is open, and rotating ball 28 and capable of driving turns
The driving motor 20 that dynamic ball 28 rotates is connected.Collecting box 11 is slidably connected with pedestal 1, and pedestal 1 is equipped with sliding rail 12, collects
The bottom of case 11, which is equipped with, to be connected with sliding 12 matched sliding groove 13 of rail, collecting box 11 with pedestal driving cylinder 14.Pass through
Collecting box 11 is collected welding workpiece 29, and reciprocal horizontal during collection of collecting box 11 moves, to avoid welding
Workpiece 29 concentrates on a position so that welding workpiece 29 can be uniformly distributed in collecting box 11.
Wherein, locating rack 26 is scraped by supporting rack 15 with the welding workpiece 29 that can will rotate into 28 bottom of rotating ball
Baffle 16 is connected, and supporting rack 15 includes being arranged under 28 both sides of rotating ball and the supporting rod 17 that is vertically arranged, supporting rod 17
Locating rod 18 is equipped between end, baffle 16 is rotatablely connected with locating rod 18, and is equipped between baffle 16 and locating rod 18 and is pre-tightened bullet
The preload direction of spring 19, preloading spring 19 is opposite with the rotation direction of rotating ball 28.Baffle 16 will rotate into 28 bottom of rotating ball
Welding workpiece 29 scrape, welding workpiece 29 is removed one by one after welding without staff, save
The time of processing also saves manpower, reduces production cost to improve the efficiency of welding.Preloading spring 19 plays slow
Punching acts on, and avoids that rigid contact occurs between baffle 16 and welding workpiece 29, avoids the two because collision is damaged.Further,
Locating rod 18 is equipped with the limiting plate 21 that limitation baffle 16 is rotated to side, and preloading spring 19 is arranged in limiting plate 21 and baffle 16
Between.Limiting plate 21 limits 16 inordinate rotation of baffle, ensures that the upper end of baffle 16 can be in contact with welding workpiece 29 and will weld
Workpiece 29 scrapes.Further, rotating ball 28 is equipped with several mounting grooves 22, the rotation of the depth of mounting groove 22 along rotating ball 28
Direction gradually deepens.Depth positioned at the mounting groove 22 of 16 negative direction of baffle is shallower, to be conducive to baffle 16 by welding workpiece 29
It scrapes.
Wherein, welding headstock 6 is rotatablely connected by rotating strut 23 with hemisphere arc plate 24, hemisphere arc plate 24 and rotating ball 28
It matches, spacing is equipped between hemisphere arc plate 24 and rotating ball 28, the madial wall in hemisphere arc plate 24 is arranged in laser welding head 7
On, hemisphere arc plate 24 is connected with the driving motor 20 that hemisphere arc plate 24 can be driven to rotate.It is fixedly connected on welding headstock 6
The lateral wall of half arc bracket 25, the madial wall and hemisphere arc plate 24 of half arc bracket 25 is slidably connected, half arc bracket, 25 institute
Plane and hemisphere arc plate 24 where plane it is perpendicular, half arc bracket 25 and hemisphere arc plate 24 have a same center of circle, half
Ball arc plate 24 can be circumferentially rotated along half arc bracket 25 with the center of circle.The rotation of hemisphere arc plate 24 also can be in rotating ball 28
Welding workpiece 29 is welded.
The application method of the bonding machine, this method include the following steps：
A. welding workpiece 29 is placed into the mounting groove 22 of rotating ball 28, zigzag tread patterns cylinder 9 drives transverse arm 3 is longitudinal to move
Suitable position is moved, the driving welding headstock 6 of horizontal drive cylinder 8 is moved horizontally to suitable position；
B. start driving motor 20 so that rotating ball 28 rotates, when the welding workpiece 29 in rotating ball 28 is with rotating ball
28 turn to top when laser welding head 7 welding workpiece 29 is welded, when the welding workpiece 29 in rotating ball 28 with
Welding workpiece 29 is fallen from rotating ball 28 when rotating ball 28 turns to lower section, or starts driving motor 20 so that hemisphere arc plate
24 rotate in cycles, are welded to the welding workpiece 29 in rotating ball 28；
C. welding workpiece 29 is fallen in collecting box 11, is started pedestal and is driven cylinder 14 so that and collecting box 11 moves back and forth,
The welding workpiece 29 in collecting box 11 is poured out when being collected into more welding workpiece 29；
D. rotating ball 28 rotates one week passes through horizontal drive gas for a work period after completing a work period
Cylinder 8, zigzag tread patterns cylinder 9 adjust welding headstock 6 position so that hemisphere arc plate 24 is in the top of other rotating balls 28, and work
Make personnel again by welding workpiece 29 mounted on being completed in the rotating ball 28 of a work period, moves in circles until all
Welding workpiece 29 is all soldered and completes.
Although pedestal 1, support column 2, transverse arm 3, welding space 4, welding headstock 6, laser welding is used more herein
First 7, horizontal drive cylinder 8, zigzag tread patterns cylinder 9, shaft 10, collecting box 11, sliding rail 12, sliding groove 13, pedestal drive gas
Cylinder 14, supporting rack 15, baffle 16, supporting rod 17, locating rod 18, preloading spring 19, driving motor 20, limiting plate 21, mounting groove
22, strut 23, hemisphere arc plate 24, half arc bracket 25, locating rack 26, hollow open 27, rotating ball 28, welding workpiece 29 are rotated
Equal terms, but it does not preclude the possibility of using other terms.The use of these items is only for more easily describe to conciliate
Release the essence of the present invention；Any one of the additional limitations is construed as all to disagree with spirit of that invention.
Claims (8)
1. a kind of bonding machine, including pedestal (1), the pedestal (1) is connected by support column (2) with transverse arm (3), described
Welding space (4) is formed between transverse arm (3) and pedestal (1), level slidably connects welding headstock (6) on the transverse arm (3),
The lower face of the welding headstock (6) be equipped with several laser welding heads (7), the welding headstock (6) with can drive
The horizontal drive cylinder (8) that welding headstock (6) moves horizontally is connected, and is longitudinal between the support column (2) and transverse arm (3)
It is slidably connected, the transverse arm (3) is connected with the zigzag tread patterns cylinder (9) that transverse arm (3) can be driven to vertically move, feature
It is, locating rack (26) is vacantly provided between the transverse arm (3) and pedestal (1), in being provided on the locating rack (26)
It is spaced apart mouth (27), the rotating ball (28) placed for welding workpiece (29) is provided in the hollow open (27), described turns
Dynamic ball (28) is rotatablely connected with locating rack (26), and when the welding workpiece (29) being located in rotating ball (28) turns with rotating ball (28)
It moves to laser welding head when top (7) and welding workpiece (29) is welded, when the welding workpiece in rotating ball (28)
(29) welding workpiece (29) is fallen from rotating ball (28) when turning to lower section with rotating ball (28).
2. bonding machine according to claim 1, which is characterized in that the rotating ball (28) passes through shaft (10) and positioning
Frame (26) is rotatablely connected, and the welding workpiece fallen can be received by being equipped between the lower part and pedestal (1) of the rotating ball (28)
(29) collecting box (11), the upper end of the collecting box (11) is open, the rotating ball (28) and can drive rotating ball
(28) driving motor (20) rotated is connected.
3. bonding machine according to claim 2, which is characterized in that the collecting box (11) is slidably connected with pedestal (1),
The pedestal (1) is equipped with sliding rail (12), and the bottom of the collecting box (11) is equipped with matched with sliding rail (12)
Sliding groove (13), the collecting box (11) are connected with pedestal driving cylinder (14).
4. bonding machine according to claim 3, which is characterized in that the locating rack (26) passes through supporting rack (15) and energy
It enough will rotate into the baffle (16) that the welding workpiece (29) of rotating ball (28) bottom scrapes to be connected, the supporting rack (15) packet
Include setting be equipped between rotating ball (28) both sides and the supporting rod (17) that is vertically arranged, the lower end of the supporting rod (17) it is fixed
Position bar (18), the baffle (16) are rotatablely connected with locating rod (18), and are equipped between baffle (16) and locating rod (18) pre-
Tight spring (19), the preload direction of the preloading spring (19) are opposite with the rotation direction of rotating ball (28).
5. bonding machine according to claim 4, which is characterized in that the locating rod (18) is equipped with limitation baffle (16)
The limiting plate (21) rotated to side, the preloading spring (19) are arranged between limiting plate (21) and baffle (16).
6. bonding machine according to claim 5, which is characterized in that the rotating ball (28) is equipped with several mounting grooves
(22), the depth of the mounting groove (22) is gradually deepened along the rotation direction of rotating ball (28).
7. bonding machine according to claim 6, which is characterized in that the welding headstock (6) is by rotating strut (23)
Be rotatablely connected with hemisphere arc plate (24), hemisphere arc plate (24) matches with rotating ball (28), the hemisphere arc plate (24) and turn
Spacing is equipped between dynamic ball (28), the laser welding head (7) is arranged on the madial wall of hemisphere arc plate (24), and described half
Ball arc plate (24) is connected with the driving motor (20) that hemisphere arc plate (24) can be driven to rotate.
8. bonding machine according to claim 7, which is characterized in that be fixedly connected with half arc on the welding headstock (6)
The lateral wall of shape holder (25), the madial wall and hemisphere arc plate (24) of half arc bracket (25) is slidably connected, described
Plane where half arc bracket (25) and the plane where hemisphere arc plate (24) are perpendicular, half arc bracket (25) and hemisphere arc
There is plate (24) the same center of circle, the hemisphere arc plate (24) can be circumferentially rotated with the center of circle along half arc bracket (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383555.2A CN106975840B (en) | 2017-05-26 | 2017-05-26 | A kind of bonding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383555.2A CN106975840B (en) | 2017-05-26 | 2017-05-26 | A kind of bonding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106975840A CN106975840A (en) | 2017-07-25 |
| CN106975840B true CN106975840B (en) | 2018-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710383555.2A Active CN106975840B (en) | 2017-05-26 | 2017-05-26 | A kind of bonding machine |
Country Status (1)
| Country | Link |
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| CN (1) | CN106975840B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535837B (en) * | 2022-03-25 | 2023-01-17 | 江苏大族粤铭激光科技有限公司 | Laser cutting device with positioning function |
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| NL167879B (en) * | 1972-08-11 | 1981-09-16 | Dornier System Gmbh | DEVICE FOR MANUFACTURING A SHAFT AND BALL BEARING FOR THE USE OF A BEARING BEARING. |
| CN202129479U (en) * | 2011-06-28 | 2012-02-01 | 浙江机电职业技术学院 | Spherical part drilling device |
| CN102729078A (en) * | 2012-06-13 | 2012-10-17 | 江苏省徐州锻压机床厂集团有限公司 | Universal clamp for machining pin holes of ball-head screws |
| CN204321412U (en) * | 2014-11-12 | 2015-05-13 | 重庆通达能源设备有限公司 | Heat exchanger laser weld processing unit (plant) |
| CN106002012A (en) * | 2016-06-29 | 2016-10-12 | 成都浩方机电有限责任公司 | Welding device for abutted pipe fittings |
| CN206047688U (en) * | 2016-06-04 | 2017-03-29 | 常州中科星龙线缆有限公司 | Sucked type semi circular shells clamp for machining |
| CN206717280U (en) * | 2017-05-26 | 2017-12-08 | 江苏海事职业技术学院 | A kind of bonding machine |
-
2017
- 2017-05-26 CN CN201710383555.2A patent/CN106975840B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL167879B (en) * | 1972-08-11 | 1981-09-16 | Dornier System Gmbh | DEVICE FOR MANUFACTURING A SHAFT AND BALL BEARING FOR THE USE OF A BEARING BEARING. |
| CN202129479U (en) * | 2011-06-28 | 2012-02-01 | 浙江机电职业技术学院 | Spherical part drilling device |
| CN102729078A (en) * | 2012-06-13 | 2012-10-17 | 江苏省徐州锻压机床厂集团有限公司 | Universal clamp for machining pin holes of ball-head screws |
| CN204321412U (en) * | 2014-11-12 | 2015-05-13 | 重庆通达能源设备有限公司 | Heat exchanger laser weld processing unit (plant) |
| CN206047688U (en) * | 2016-06-04 | 2017-03-29 | 常州中科星龙线缆有限公司 | Sucked type semi circular shells clamp for machining |
| CN106002012A (en) * | 2016-06-29 | 2016-10-12 | 成都浩方机电有限责任公司 | Welding device for abutted pipe fittings |
| CN206717280U (en) * | 2017-05-26 | 2017-12-08 | 江苏海事职业技术学院 | A kind of bonding machine |
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| Publication number | Publication date |
|---|---|
| CN106975840A (en) | 2017-07-25 |
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