CN202591811U - Internal and external double-face welding device for steel pipe and flange - Google Patents
Internal and external double-face welding device for steel pipe and flange Download PDFInfo
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- CN202591811U CN202591811U CN 201220237086 CN201220237086U CN202591811U CN 202591811 U CN202591811 U CN 202591811U CN 201220237086 CN201220237086 CN 201220237086 CN 201220237086 U CN201220237086 U CN 201220237086U CN 202591811 U CN202591811 U CN 202591811U
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Abstract
The utility model discloses an internal and external double-face welding device for a steel pipe and a flange. The internal and external double-face welding device for the steel pipe and the flange is high in production efficiency; and by using the welding device, stable welding quality and low welding cost can be guaranteed. The welding device comprises an internal welding device, an external welding device, a machine frame, a drive motor, a gear drive mechanism, a connection template and a flange fixing template; the machine frame is provided with a supporting seat with a circular through hole; the connection template is circular and can be arranged in the circular through hole by rotating around the axis of the circular through hole; a driving wheel of the gear drive mechanism is connected with the drive motor; a driven wheel and the connection template are coaxially arranged on the side of the connection template; the flange fixing template and the driven wheel which are opposite to each other are arranged on the other side of the connection template; and the middle parts of the driven wheel, the connection template and the flange fixing template are all provided with communication holes which are communicated with each other.
Description
Technical field
The utility model relates to a kind of welder, be specifically related to a kind of steel pipe and flange inside and outside two-sided welder.
Background technology
The traditional steel pipe and the Welding Structure of flange are the Welding Structures through steel pipe and face-flange and stiffener formation, and the mode of gas shielded arc welding is welded usually.Further, in order to improve welding efficiency and steel pipe and flange bonding strength, adopt the band neck to forge flange and butt welding of steel tube structure at present.At present hubbed flange and steel pipe connect weldering, adopt the welding manner of carbon-dioxide protecting gas usually.For example, Chinese patent publication number CN201483140U, open day on 05 26th, 2010; The name that utility model is created is called the steel pipe flange automatic welding machine, and this application case discloses a kind of steel pipe flange automatic welding machine, comprises welding machine, CO2 gas cylinder, frame; Welding wire in the welding machine flows to welding gun by wire-feed motor; Said welding gun is controlled by governor motion, on frame, installs by motor-driven three-jaw self-centering chuck, said three-jaw self-centering chuck chucking flange; The other end in frame is provided with to support two rolling wheel supports of welded still pipe; Be positioned at the steel pipe of needs welding between two rollers of two rolling wheel supports, the steel pipe that needs welding is accomplished a circulation along with the flange that is fixed on the three-jaw self-centering chuck rotates a week.The hoop butt welding welding seam that the band neck forges flange and steel pipe need arrive the first-order weld quality requirement, and the welding efficiency of the welding manner of this employing carbon-dioxide protecting gas is low.If the mode of single face welding and double face shaping is also adopted in employing submerged-arc welding, promptly through on the lateral surface of hubbed flange and steel pipe, carrying out submerged-arc welding, the medial surface that is welded in hubbed flange and steel pipe through pad simultaneously also forms good welding; But this welding procedure also forms good welding for the medial surface that guarantees hubbed flange and steel pipe, need beat groove with the thickness between the lateral surface in reducing in the lateral surface port of steel pipe; Also need add ceramic substrate in steel duct simultaneously, because the mode of single face welding and double face shaping, the weld seam when welding needs a through welding steel pipe surfaces externally and internally.The single face welding and double face shaping of hubbed flange and steel pipe employing at present connects the weldering method, owing to need add ceramic substrate, not only expend man-hour, reduce welding efficiency, and the manufacturing industry of ceramic substrate is very difficult, and recycling rate of waterused is low, increases welding cost.
The utility model content
The purpose of the utility model is low in order to overcome existing steel pipe and the flange production efficiency in welding process; The problem that welding cost is high; A kind of production efficiency height, good heat dissipation effect, long service life are provided, and low steel pipe of welding quality stable, welding cost and flange inside and outside two-sided welder.
The technical scheme of the utility model is:
Two-sided welder inside and outside a kind of steel pipe and the flange; Comprise internal welding device, outer welder, frame, drive motors, gear drive, connection template and flange fixed form; Said frame be provided with one have a manhole supporting seat; Said connection template is rounded and can be located in the manhole around what the manhole axis rotated, and the driving wheel of said gear drive is connected with drive motors, driven pulley be connected coaxial being arranged on the connection template side of template; What said flange fixed form was relative with driven pulley is located on the another side that is connected template; The middle part of said driven pulley, connection template and flange fixed form is equipped with intercommunicating pore and each intercommunicating pore is connected; Said internal welding device comprises the internal welding machine head, is arranged on first guide rail on the board; Slidably be arranged on the welding machine seat on first guide rail and be used to pass the thrust unit of welding machine seat; Said internal welding machine head is located on the welding machine seat; Said first guide rail is positioned at the same side that is connected template with driven pulley, and first guide rail extends setting along the axis direction that connects template; Said internal welding machine head can stretch in the intercommunicating pore along first guide rail.The welding process of this programme can be accomplished through following steps, when welding, at first flange is fixed on the flange fixed form, simultaneously steel pipe and flange is carried out the center and aligns.Then, through spot welding steel pipe tentatively is connected with flange.Follow again, with the welding head aligning steel pipe of outer welder and the seam that is connected of flange lateral surface; And make the internal welding machine head of internal welding device aim at the seam that is connected of steel pipe and flange medial surface through thrust unit.At last, rotate through the driven wheel drive connection template and the flange fixed form of drive motors through gear drive, thereby drive flange and steel pipe rotate, flange and steel pipe revolution move a week, accomplish the welding of a flange and steel pipe.Certainly internal welding device and outer welder also can be respectively weld the annulus of the inside and outside side of steel pipe and flange.Through the welder of this programme, make the inside and outside side of steel pipe and flange be welded on the same board and accomplish, not only can improve the welding efficiency of welding process, can also improve welding stability and welding quality greatly.Owing to the mode of two-sided welding inside and outside adopting, need not add the cushions simultaneously; This is because all weld the inside and outside side of steel pipe and flange, so when the medial surface of steel pipe and flange or lateral surface are welded, does not need the inside and outside side of through welding steel pipe and flange; Can under the prerequisite that does not reduce welding quality, effectively reduce welding cost like this.On the other hand, drive the steel pipe rotation through rotary flange, because the weld seam of flange and steel pipe, can be avoided the deviation of steel pipe owing to circularity and linearity near the flange fixed form in welding process, the circle that causes is beated to the influence of welding quality.
As preferably, the sidewall of manhole is provided with first annular groove coaxial with manhole, is provided with three copper packings that are concave shape and copper packings in first annular groove at least and is circumferentially and evenly distributes; Said connection template is located in first annular groove and is matched with copper packing, and with the cylindrical anchor ring that is connected template of copper packing joint and two sides on be equipped with at least one second annular groove.Owing to be provided with the copper packing that is concave shape in first annular groove, connect template and match with copper packing, make to connect template in rotating process, not only can reduce friction area, help connecting the rotation of template and reduce frictional heat; Importantly, owing to being arranged so that of copper packing connects template in rotating process, can in first annular groove, form a heat dissipation channel between copper packing and the copper packing and be in communication with the outside, the heat radiation in the rotation process of quickening connection template improves service life.Simultaneously, the setting of second annular groove not only can reduce to connect the contact area of template and copper packing; Importantly, second annular groove directly has been communicated with the heat dissipation channel between adjacent two copper packings, makes the frictional heat that produces between connection template and the copper packing be able to distribute fast, and then improves service life.
As preferably, be provided with in each second annular groove and somely be circumferential equally distributed dividing plate, and the end face of dividing plate is positioned at the below of the second annular groove opening.Because the setting of dividing plate, in the rotation process that connects template, dividing plate can drive circulation of air; Especially when dividing plate rotates to the copper packing place, can drive air and pour between the copper packing and second annular groove, can strengthen copper packing and the radiating effect that is connected template greatly, improve service life.
As preferably; Outer welder comprises lifting motor, walks crosswise motor, outer welding head, be arranged on the column on the board and be arranged on the crossbeam on the column; Said column one side is provided with two longitudinal rails that are parallel to each other; Be provided with vertical first leading screw and nut mechanism that is provided with between said two longitudinal rails, said lifting motor is located at the column top and is connected with the screw mandrel of first leading screw and nut mechanism; Said crossbeam slidably is located on the longitudinal rail and through the nut of bolt with first leading screw and nut mechanism and is connected; One side of said crossbeam is provided with transverse concave groove, is respectively equipped with a horizontal guide groove on the two sides of this transverse concave groove, and the bottom of this transverse concave groove is provided with horizontal tooth bar; The slide bar that one cross section is the T font slidably is located in the transverse concave groove and with horizontal guide groove and is matched; Said outer welding head is located at the slide bar outer end; The said motor of walking crosswise is located at the other end relative with outer welding head on the slide bar, and walks crosswise motor and be provided with one and walk crosswise gear and be meshed with horizontal tooth bar.Through the outer welder of this programme, make the position of outer welding head to regulate as required, and can regulate stably in the feasible outer welding head transposition joint on the throne process.
As preferably; The lateral surface of flange fixed form is provided with at least three gathering sill and gathering sills that radially are provided with and is circularly and evenly distributed, and gathering sill is the I-shaped groove, is provided with slide in the said gathering sill; Slide comprises top shoe and the sliding block that is the T font; Top shoe is located at I-shaped groove top, and sliding block is located at I-shaped groove bottom, and said upper and lower slide block connects through bolt; Said top shoe end face is provided with the screw that is used for adpting flange.Through this programme structure, the flange of various different models is fixed on the slide of flange fixed form, to improve the scope of application of welder.
As preferably, thrust unit comprise second leading screw and nut mechanism, bearing block and in welding motor, said bearing block is arranged on the board, rotating being located in the bearing block of screw mandrel one end of second leading screw and nut mechanism; The welding machine seat is connected with nut, and motor is connected with screw mandrel through shaft coupling.
As preferably, the welding machine of internal welding device and outer welder is the submerged-arc welding welding machine.
The beneficial effect of the utility model is: have the production efficiency height, and long service life, welding quality stable, welding cost is low, and advantage of wide range of application.
Description of drawings
Fig. 1 is a kind of structural representation of the utility model.
Fig. 2 is a kind of local structure for amplifying sketch map at A place among Fig. 1.
Fig. 3 is a kind of structural representation at the thrust unit place of the utility model.
Fig. 4 is a kind of structural representation of the flange fixed form of the utility model.
Fig. 5 is a kind of part section structural representation at the slide place of the utility model.
Among the figure: outer welder 1; Internal welding device 2; Driven pulley 3; Connect template 4; Flange 5; Flange fixed form 6; Intercommunicating pore 7; Drive motors 8; Driving wheel 9; Crossbeam 10; Walk crosswise motor 11; Column 12; Lifting motor 13; Slide bar 14; Outer welding head 15; Internal welding machine head 16; Supporting seat 17; Benchmark template 18; Fixed form 19; Copper packing 20; Second annular groove 21; Steel pipe 22; First guide rail 23; Welding machine seat 24; Second leading screw and nut mechanism 25; Interior welding motor 26; Bearing block 27; Gathering sill 28; Slide 29; Top shoe 30; Sliding block 31; Dividing plate 32.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the utility model is described in further detail:
Embodiment 1: as shown in Figure 1, two-sided welder inside and outside a kind of steel pipe and the flange comprises internal welding device 2, outer welder 1, frame, drive motors 8, gear drive, connection template 4 and flange fixed form 6.The welding machine of internal welding device and outer welder is the submerged-arc welding welding machine.
As shown in Figure 2, said frame be provided with one have a manhole supporting seat 17, said connection template 4 is rounded and can be located in the manhole around what the manhole axis rotated.Be specifically, the sidewall of manhole is provided with first annular groove coaxial with manhole, is provided with four copper packing 20 and copper packings that are concave shape in first annular groove and is circumferentially evenly distribution.Said connection template 4 is located in first annular groove and with copper packing 20 and is matched; And be equipped with second annular groove 21 on the cylindrical anchor ring that is connected template 4 of copper packing 20 joints and the two sides.Be provided with in each second annular groove 21 and somely be circumferential equally distributed dividing plate 32, and the end face of dividing plate is positioned at the below of the second annular groove opening.
Owing to be provided with the copper packing 20 that is concave shape in first annular groove, and connection template 4 matches with copper packing 20; When connecting template 4 in rotating process, not only can reduce friction area; The more important thing is; Because being arranged so that of copper packing 20 connects template in rotating process; Can form a heat dissipation channel at first annular groove between copper packing 20 and the copper packing 20 and be in communication with the outside, the heat radiation in the rotation process of quickening connection template improves service life.Simultaneously, the setting of second annular groove 21 not only can reduce to connect the contact area of template and copper packing; The more important thing is that second annular groove 21 directly has been communicated with the heat dissipation channel between adjacent two copper packings, make the frictional heat that produces between connection template and the copper packing be able to distribute fast.
Above-mentioned supporting seat 17 comprises benchmark template 18 and fixed form 19; The middle part of said benchmark template and fixed form is provided with manhole; And be positioned at manhole edge on benchmark template 18 1 sides and be provided with the recessed ledge frame that caves inward, on the side at the openend place of the recessed ledge frame of said fixed form 19 through being bolted to benchmark template 18.The recessed ledge frame matching and fixing template of said benchmark template forms first annular groove.
Like Fig. 1, shown in Figure 2, the driving wheel 9 of gear drive is connected with drive motors 8, driven pulley 3 be connected coaxial being arranged on of template 4 and connect on template 4 sides.What said flange fixed form 6 was relative with driven pulley is located on the another side that is connected template 4.Said driven pulley 3, the middle part that connects template 4 and flange fixed form 6 is equipped with intercommunicating pore 7 and each intercommunicating pore is connected.
Like Fig. 1, shown in Figure 3, internal welding device 2 comprises internal welding machine head 16, is arranged on first guide rail 23 on the board, slidably is arranged on the welding machine seat 24 on first guide rail and is used to pass the thrust unit of welding machine seat.Thrust unit comprise second leading screw and nut mechanism 25, bearing block 27 and in welding motor 26.Said bearing block 27 is arranged on the board, rotating being located in the bearing block of screw mandrel one end of second leading screw and nut mechanism 25.Welding machine seat 24 is connected with nut.Interior welding motor 26 is connected with screw mandrel through shaft coupling.Said internal welding machine head 16 is located on the welding machine seat 24.Said first guide rail 23 is positioned at the same side that is connected template 4 with driven pulley 3, and first guide rail extends setting along the axis direction that connects template.Said internal welding machine head 16 can stretch in the intercommunicating pore 7 along first guide rail 23.
Above-mentioned thrust unit can also be set to: comprise gear & rack structure, motor, said tooth bar is provided with along first guide rail 23; Said motor is located on the welding machine seat 24, and said gear is located on the motor and with tooth bar and is meshed.Above-mentioned thrust unit can also be replaced by cylinder or oil cylinder.
As shown in Figure 1, outer welder 1 comprises lifting motor 13, walks crosswise motor 11, outer welding head 15, be arranged on the column 12 on the board and be arranged on the crossbeam 10 on the column.Said column 12 1 sides are provided with two longitudinal rails that are parallel to each other, and are provided with vertical first leading screw and nut mechanism that is provided with between said two longitudinal rails.Said lifting motor 13 is located at column 12 tops and is connected with the screw mandrel of first leading screw and nut mechanism.Said crossbeam 10 slidably is located on the longitudinal rail and through the nut of bolt with first leading screw and nut mechanism and is connected.One side of said crossbeam 10 is provided with transverse concave groove, is respectively equipped with a horizontal guide groove on the two sides of this transverse concave groove, and the bottom of this transverse concave groove is provided with horizontal tooth bar.The slide bar 14 that one cross section is the T font slidably is located in the transverse concave groove and with horizontal guide groove and is matched.Said outer welding head 15 is located at slide bar 14 outer ends, and the said motor 11 of walking crosswise is located at the other end relative with outer welding head on the slide bar, and walks crosswise motor 11 and be provided with one and walk crosswise gear and be meshed with horizontal tooth bar.
Like Fig. 4, shown in Figure 5, the lateral surface of flange fixed form 6 is provided with eight gathering sill 28 and gathering sills that radially are provided with and is circularly and evenly distributed.Gathering sill 28 is the I-shaped groove, is provided with slide 29 in the said gathering sill.Slide 29 comprises top shoe 30 and the sliding block 31 that is the T font, and top shoe 30 is located at I-shaped groove top, and sliding block 31 is located at I-shaped groove bottom, and said upper and lower slide block connects through bolt.Said top shoe end face is provided with the screw that is used for adpting flange 5.
Concrete welding process can be accomplished through following steps, at first flange 5 is fixed on the flange fixed form 6, simultaneously steel pipe 22 and flange is carried out the center and aligns.Then, the outer welding machine through outer welder 1 carries out spot welding, and steel pipe 22 tentatively is connected with flange 5.Follow again, with the welding head aligning steel pipe of outer welder 1 and the seam that is connected of flange lateral surface; And make the internal welding machine head of internal welding device 2 aim at the seam that is connected of steel pipe and flange medial surface through thrust unit.At last, rotate through the driven wheel drive connection template 4 and the flange fixed form 6 of drive motors 8, thereby drive flange and steel pipe rotate through gear drive.In flange and steel pipe rotation, the outer welding machine of outer welder 1 and the internal welding machine work of internal welding device 2.When flange and steel pipe rotate a week, promptly accomplish the welding of a flange and steel pipe.Certainly internal welding device and outer welder also can be respectively weld the annulus of the inside and outside side of steel pipe and flange.Through the welder of this programme, make the inside and outside side of steel pipe and flange be welded on the same board and accomplish, not only can improve the welding efficiency of welding process, can also improve welding stability and welding quality greatly.On the other hand, the welder of this programme need not add the cushions through adopting the welding method of inside and outside double-submerged arc, can effectively reduce welding cost.
Claims (7)
- Steel pipe and flange inside and outside two-sided welder; It is characterized in that; Comprise internal welding device (2), outer welder (1), frame, drive motors (8), gear drive, connection template (4) and flange fixed form (6); Said frame be provided with one have a manhole supporting seat (17); Said connection template (4) is rounded and can be located in the manhole around what the manhole axis rotated, and the driving wheel of said gear drive (9) is connected with drive motors, driven pulley (3) be connected coaxial being arranged on connection template (4) side of template; What said flange fixed form (6) was relative with driven pulley is located on the another side that is connected template; The middle part of said driven pulley, connection template and flange fixed form is equipped with intercommunicating pore (7) and each intercommunicating pore is connected; Said internal welding device comprises internal welding machine head (16), is arranged on first guide rail (23) on the board; Slidably be arranged on the welding machine seat (24) on first guide rail and be used to pass the thrust unit of welding machine seat; Said internal welding machine head is located on the welding machine seat; Said first guide rail (23) is positioned at the same side that is connected template (4) with driven pulley (3), and first guide rail extends setting along the axis direction that connects template; Said internal welding machine head can stretch in the intercommunicating pore along first guide rail.
- 2. two-sided welder inside and outside a kind of steel pipe according to claim 1 and the flange; It is characterized in that; The sidewall of said manhole is provided with first annular groove coaxial with manhole, is provided with three copper packing (20) and copper packings that are concave shape in first annular groove at least and is circumferentially evenly distribution; Said connection template (4) is located in first annular groove and is matched with copper packing, and with the cylindrical anchor ring that is connected template (4) of copper packing (20) joint and two sides on be equipped with at least one second annular groove (21).
- 3. two-sided welder inside and outside a kind of steel pipe according to claim 2 and the flange; It is characterized in that; Be provided with in said each second annular groove (21) and somely be circumferential equally distributed dividing plate (32), and the end face of dividing plate is positioned at the below of the second annular groove opening.
- 4. two-sided welder inside and outside a kind of steel pipe according to claim 1 and the flange; It is characterized in that; Said outer welder (1) comprises lifting motor (13), walks crosswise motor (11), outer welding head (15), be arranged on the column (12) on the board and be arranged on the crossbeam (10) on the column; Said column (12) one sides are provided with two longitudinal rails that are parallel to each other; Be provided with vertical first leading screw and nut mechanism that is provided with between said two longitudinal rails, said lifting motor is located at the column top and is connected with the screw mandrel of first leading screw and nut mechanism; Said crossbeam (10) slidably is located on the longitudinal rail and through the nut of bolt with first leading screw and nut mechanism and is connected; One side of said crossbeam (10) is provided with transverse concave groove, is respectively equipped with a horizontal guide groove on the two sides of this transverse concave groove, and the bottom of this transverse concave groove is provided with horizontal tooth bar; The slide bar (14) that one cross section is the T font slidably is located in the transverse concave groove and with horizontal guide groove and is matched; Said outer welding head (15) is located at the slide bar outer end, and the said motor of walking crosswise is located at the other end relative with outer welding head on the slide bar, and walks crosswise motor and be provided with one and walk crosswise gear and be meshed with horizontal tooth bar.
- 5. according to two-sided welder inside and outside claim 1 or 2 or 3 or 4 described a kind of steel pipes and the flange; It is characterized in that; The lateral surface of flange fixed form (6) is provided with at least three gathering sill (28) and gathering sills that radially are provided with and is circularly and evenly distributed, and gathering sill is the I-shaped groove, is provided with slide (29) in the said gathering sill; Slide comprises top shoe (30) and the sliding block (31) that is the T font; Top shoe is located at I-shaped groove top, and sliding block is located at I-shaped groove bottom, and said upper and lower slide block connects through bolt; Said top shoe end face is provided with the screw that is used for adpting flange.
- 6. according to two-sided welder inside and outside claim 1 or 2 or 3 or 4 described a kind of steel pipes and the flange; It is characterized in that; Thrust unit comprises second leading screw and nut mechanism (25), bearing block (27) and interior welding motor (26); Said bearing block is arranged on the board, rotating being located in the bearing block of screw mandrel one end of second leading screw and nut mechanism; The welding machine seat is connected with nut, and interior welding motor is connected with screw mandrel through shaft coupling.
- 7. according to two-sided welder inside and outside claim 1 or 2 or 3 or 4 described a kind of steel pipes and the flange, it is characterized in that the welding machine of internal welding device and outer welder is the submerged-arc welding welding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220237086 CN202591811U (en) | 2012-05-22 | 2012-05-22 | Internal and external double-face welding device for steel pipe and flange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220237086 CN202591811U (en) | 2012-05-22 | 2012-05-22 | Internal and external double-face welding device for steel pipe and flange |
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| Publication Number | Publication Date |
|---|---|
| CN202591811U true CN202591811U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220237086 Expired - Fee Related CN202591811U (en) | 2012-05-22 | 2012-05-22 | Internal and external double-face welding device for steel pipe and flange |
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| CN (1) | CN202591811U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728938A (en) * | 2012-05-22 | 2012-10-17 | 戴刚平 | Inner-outer dual-surface welding device for steel tube and flange |
| CN103143814A (en) * | 2013-02-22 | 2013-06-12 | 杭州德宝机电制造有限公司 | Equipment special for girth welding of steel pipe and welding neck flange |
| CN103894703A (en) * | 2012-12-29 | 2014-07-02 | 上海沃迪自动化装备股份有限公司 | Double-face arc welding process |
| CN106208730A (en) * | 2016-07-18 | 2016-12-07 | 钦州合创电气有限公司 | A kind of new type inverter of controlled rectifier |
-
2012
- 2012-05-22 CN CN 201220237086 patent/CN202591811U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728938A (en) * | 2012-05-22 | 2012-10-17 | 戴刚平 | Inner-outer dual-surface welding device for steel tube and flange |
| CN103894703A (en) * | 2012-12-29 | 2014-07-02 | 上海沃迪自动化装备股份有限公司 | Double-face arc welding process |
| CN103143814A (en) * | 2013-02-22 | 2013-06-12 | 杭州德宝机电制造有限公司 | Equipment special for girth welding of steel pipe and welding neck flange |
| CN103143814B (en) * | 2013-02-22 | 2015-08-26 | 杭州德宝机电制造有限公司 | Steel pipe and hubbed flange boxing welding dedicated device |
| CN106208730A (en) * | 2016-07-18 | 2016-12-07 | 钦州合创电气有限公司 | A kind of new type inverter of controlled rectifier |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20170522 |
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| CF01 | Termination of patent right due to non-payment of annual fee |