CN106984649A - A kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism - Google Patents
A kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism Download PDFInfo
- Publication number
- CN106984649A CN106984649A CN201710361403.2A CN201710361403A CN106984649A CN 106984649 A CN106984649 A CN 106984649A CN 201710361403 A CN201710361403 A CN 201710361403A CN 106984649 A CN106984649 A CN 106984649A
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- China
- Prior art keywords
- core bar
- rolling mill
- mandrel trolley
- nitrogen
- inflation mechanism
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vacuum Packaging (AREA)
Abstract
Invention describes a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism, it includes core bar and mandrel trolley to be processed, mandrel trolley is slidably enclosed on core bar, nitrogen gas generating device for producing nitrogen is installed above mandrel trolley, aligning device for adjusting the output interface position is installed on the output interface of nitrogen gas generating device, bearing block is fixed with the shell of aligning device, self-aligning bearing is installed on bearing block, output interface is connected by self-aligning bearing with set hermetic seal of blowing；Inflatable bar is additionally provided with being right against the side for blowing set, one end hermetic seal of the air inlet of inflatable bar by connecting flexible pipe and swivel joint is connected, the other end of swivel joint and the rear end of limit shaft connect and seal fixation, and the front end of the limit shaft connects and sealed with core bar.The present invention solves the leakage problem in air blowing process, and installs easy to connect, and holistic cost is relatively low.
Description
Technical field
The present invention relates to a kind of manufacture craft of copper pipe, especially a kind of three-roller planetary rolling mill strand endoporus nitrogen inflator
Structure, belongs to technical field of nonferrous metal processing.
Background technology
Very high to the performance requirement of supporting copper pipe in the processing of air-conditioning, its quality to product has directly
Influence, therefore when manufacturing copper pipe, to pass through multiple tracks production process, wherein, to the purging of copper tube inwall core bar
It is exactly an important ring.As shown in figure 1, it is existing current when being purged to copper tube inwall core bar, use in copper pipe
The former limit shaft 1 of outer sheath one, air channel 2 is offered on former limit shaft 1, and correspondence is opened up in purging, it is necessary on copper pipe
Multiple passages 3, and make passage 3 just right with air channel 2 on former limit shaft 1, the nitrogen being blown into enters logical through air channel 2
In stomata 3, further copper tube inwall is purged.But, there is obvious defect in this mode, due to limit shaft
It is to be rigidly connected between strand copper pipe, therefore there can be gap between one side limit shaft and strand copper pipe unavoidably, easily leakage
Gas, on the other hand rotates copper tube in purge due to needing, because limit shaft and copper pipe are difficult to Complete Synchronization, therefore
The situation that air channel and passage misplace occurs, the risk of gas leakage is thus further increased, once and gas leak,
It will make it that inner inflatable amount is not enough, air pressure reduction, therefore it is it cannot be guaranteed that pressure and flow in nitrogen to core bar, causes nitrogen
Throughput, insufficient pressure, tube rolling inwall are oxidizable, and oxidation causes product unqualified.
The content of the invention
For above-mentioned deficiency of the prior art, it is a primary object of the present invention to solve now at present to copper tube to enter
During row purging the problem of easy gas leakage, and introduce a kind of air-tightness preferably, can ensure in the three-roller planetary rolling mill strand of air pressure
Hole nitrogen gas filling technology.
Technical scheme：A kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism, including core to be processed
Bar, it is characterised in that also including the mandrel trolley on core bar, the mandrel trolley is slidably enclosed on core bar,
Nitrogen gas generating device for producing nitrogen is installed above the mandrel trolley, connect in the output of the nitrogen gas generating device
Aligning device for adjusting the output interface position is installed on mouth, bearing is fixed with the shell of the aligning device
Seat, is provided with self-aligning bearing on the bearing block, and the output interface is connected by self-aligning bearing with set hermetic seal of blowing；
It is right against the side for blowing set and is additionally provided with inflatable bar, the inflatable bar is located in same horizontal line with set of blowing, described to blow
One end hermetic seal of the air inlet of gas bar by connecting flexible pipe and swivel joint is connected, the other end of the swivel joint and existing limit
The rear end of position axle connect and seals fixation, and it is interior and interior set cavity, the existing limit that the existing limit shaft is laterally laid in mandrel trolley
The front end of position axle connects and sealed with core bar；The gas outlet of the inflatable bar covers sealing pair after mandrel trolley slip with blowing
Connect.
Optimally, one end of the core bar is in mandrel trolley, and the other end of core bar is arranged in copper tube, in institute
Core head is also equipped with the inside of the termination for stating copper tube, the core head is contacted and pushed against with core bar.Here core bar directly from
Copper tube is molded from making, it is characteristic of the invention that be not required to open up passage in addition on core bar, therefore the core bar ensured is complete
Whole property, while sealing effectiveness is also more preferable.
Optimally, the rectangular cross-section structure of described mandrel trolley, is provided with installation passage, the peace in mandrel trolley
Dress passage is made up of adjacent first passage and second channel, and wherein the internal diameter of first passage is more than the internal diameter of second channel, institute
State existing limit shaft to stretch into first passage from the side of mandrel trolley, the core bar stretches into second from the opposite side of mandrel trolley and led to
In road, at least two groups rolling bearings are also equipped with the inwall of the second channel, the mandrel trolley passes through corresponding rolling
Dynamic bearing contacts with core bar and keeps slidably state.Special mandrel trolley is employed herein to realize the purging of core bar, this
Mandrel trolley in invention is designed and produced for core bar and supporting inflation mechanism, and on the one hand it slide conveniently can
It is engaged with core bar, while also having ventilation turn-on effect well.
Optimally, snap ring is additionally provided with the inwall of the second channel, described limit shaft is small with core bar by snap ring
Car is connected and positioned.Limit shaft can be positioned by the snap ring, it is to avoid the situation of gas leakage after occurring rocking and connecting occurs.
Optimally, the contraction air bag for adjusting caliber, the air inlet of the contraction air bag are installed in the set of blowing
End is connected with the air cavity of nitrogen gas generating device, and the contraction air bag keeps expansion state when nitrogen gas generating device starts, described
Air bag is shunk to shrink when nitrogen gas generating device is closed and control inflatable bar with set of blowing to depart from.Here can be with by shrinking air bag
Realize that the automatic of set of blowing opens and shunk, so as to reach that the connection of control inflatable bar and set of blowing sealedly is acted on.
Optimally, the aligning device includes spacing ring, and the spacing ring is made up of upper half annulus and lower half annulus, institute
State upper half annulus bottom two ends and be provided with first flange, lower half annulus top two ends are provided with second flange, described
The first riffled tube is provided with the top of first flange, the second flange bottom is provided with the second riffled tube, described first
Screwed pipe and the second riffled tube are connected with bolt thread, and the spacing ring bottom is provided with base, and the base top is set
Screw channel is equipped with, the stud base is arranged in screw channel.Nitrogen can be automatically adjusted by the aligning device to send out
Generating apparatus output interface is balanced, so that the stability under ensureing the working condition of equipment.
Optimally, rotating shaft, the diameter of the spacing ring and the diameter phase of rotating shaft are socketed with the spacing ring
Together.Here it is the precision of raising equipment for the ease of installing using the rotating shaft of same diameter.
Optimally, the bolt thread is connected with self-locking nut, and the self-locking nut is arranged on the second riffled tube and bottom
Between seat.
Optimally, the quantity of the screw channel is two.
Optimally, the shape size of the first flange and the shape size of second flange are identical.The present invention is using identical
The flange of shape is the cost of manufacture for control device, while being also beneficial to reduce the cost that post facility is safeguarded.
Relative to prior art, the invention has the advantages that：
1st, the problem of solving gas leakage, the present invention, can be same with copper pipe when being purged using the connected mode of swivel joint
Step is rotated, and uses soft connection, can be avoided the generation of gas leak phenomenon, ensured the stabilization of air pressure, thoroughly solve and blow
During sweeping the problem of gas leakage, the lifting to product quality is very helpful.
2nd, install easy to connect, the swivel joint overall structure that the present invention is used is simpler, and installation difficulty is smaller,
Be not in the problem of fit precision is inadequate, reduce technology difficulty.
3rd, holistic cost is relatively low, with good reliability, and fault rate is low, is also beneficial to reduce the maintenance cost of equipment,
Improve production efficiency.
4th, the present invention is also by setting spacing ring, first flange, second flange, the first riffled tube, the second riffled tube
And bolt, the fine setting of countershaft vertical direction is realized, while spacing ring, first flange and second flange realize rotating shaft after fine setting
Position fix.
Brief description of the drawings
Fig. 1 is Integral connection structure when being purged in the prior art to copper pipe；
The attachment structure schematic diagram that Fig. 2 is used for the purging process of the present invention；
Fig. 3 is the front view of aligning device in the present invention；
Fig. 4 is the side view of aligning device in the present invention；
Fig. 5 is the top view of aligning device in the present invention；
Fig. 6 is the structure sectional view of set of being blown in the present invention.
In figure, 1-original limit shaft, 2-air channel, 3-passage, 4-core bar, 5-mandrel trolley, 6-nitrogen occurs
Device, 7-aligning device, 71-spacing ring, 72-upper half annulus, 73-lower half annulus, 74-first flange, the 75-the second method
Orchid, the 76-the first riffled tube, the 77-the second riffled tube, 78-bolt, 79-base, 80-screw channel, 81-rotating shaft,
82-self-locking nut, 8-bearing block, 9-self-aligning bearing, 10-set of blowing, 11-inflatable bar, 12-connection flexible pipe, 13-rotation
Adapter, 14-show limit shaft, 15-copper tube, 16-core head, 17-installation passage, 18-first passage, 19-the
Two passages, 20-rolling bearing, 21-snap ring, 22-shrink air bag, 23-three-roller planetary rolling mill.
Embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
As shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a kind of three-roller planetary rolling mill strand endoporus nitrogen inflator of the invention
Structure, including core bar 4 to be processed, in addition to the mandrel trolley 5 on core bar 4, the mandrel trolley 5 are slidably enclosed on
On core bar 4, the nitrogen gas generating device 6 for producing nitrogen is installed in the top of the mandrel trolley 5, occurred in the nitrogen
Aligning device 7 for adjusting the output interface position is installed, in the aligning device 7 on the output interface of device 6
Bearing block 8 is fixed with shell, self-aligning bearing 9 is installed on the bearing block 8, the output interface passes through self-aligning bearing 9
10 hermetic seals of set are connected with blowing；Be additionally provided with inflatable bar 11 being right against the side for blowing set 10, the inflatable bar 11 with
Set 10 of blowing is located in same horizontal line, and the air inlet of the inflatable bar 11 is by connecting one end of flexible pipe 12 and swivel joint 13
Hermetic seal is connected, and the other end of the swivel joint 13 is connected with the rear end of existing limit shaft 14 and seals fixation, described existing spacing
Axle 14 be laterally laid in mandrel trolley 5 and it is interior set cavity, the front end of the existing limit shaft 14 connects and sealed with core bar 4；Institute
Docked after the slip of mandrel trolley 5 with the sealing of set 10 of blowing the gas outlet for stating inflatable bar 11.In the present invention, nitrogen gas generating device 6
Existing apparatus is used, the nitrogen of air pressure and output needed for it can be produced.
Further, one end of the core bar 4 is in mandrel trolley 5, and the other end of core bar 4 is arranged on copper tube 15
It is interior, core head 16 is also equipped with the inside of the termination of the copper tube 15, the core head 16 is contacted and pushed against with core bar 4.
The rectangular cross-section structure of described mandrel trolley 5, is provided with installation passage 17 in the mandrel trolley 5, the installation passage 17 by
Adjacent first passage 18 and second channel 19 is constituted, and wherein the internal diameter of first passage 18 is more than the internal diameter of second channel 19, institute
The side for stating existing limit shaft 14 from mandrel trolley 5 is stretched into first passage 18, and the opposite side of core bar 4 from the mandrel trolley 5 is stretched
Enter in second channel 19, at least two groups rolling bearings 20 are also equipped with the inwall of the second channel 19, the core bar is small
Car 5 is contacted with core bar 4 by corresponding rolling bearing 20 and keeps slidably state.On the inwall of the second channel 19 also
Provided with snap ring 21, described limit shaft 14 is connected and positioned with mandrel trolley 5 by snap ring 21.
In the present invention, the contraction air bag 22 for adjusting caliber, the contraction air bag are installed in the set 10 of blowing
22 inlet end is connected with the air cavity of nitrogen gas generating device 6, and the contraction air bag 22 keeps expanding when nitrogen gas generating device 6 starts
The state of opening, the contraction air bag 22 shrinks when nitrogen gas generating device 6 is closed and controls inflatable bar 11 to depart from set 10 of blowing.It is logical
The sealing after blow set 10 and the connection of inflatable bar 11 can effectively be improved by crossing the contraction air bag 22, while can also take off automatically
From.
Referring to Fig. 3, Fig. 4 and Fig. 5, in the present invention, the aligning device 7 includes spacing ring 71, the spacing ring 71 be by
Upper half annulus 72 and lower half annulus 73 are constituted, and the bottom two ends of upper half annulus 71 are provided with first flange 74, the lower half
The top two ends of annulus 73 are provided with second flange 75, and the top of first flange 74 is provided with the first riffled tube 76, described
The bottom of second flange 75 is provided with the second riffled tube 77, and the riffled tube 77 of the first riffled tube 76 and second is and bolt
78 threaded connections, the bottom of spacing ring 71 is provided with base 79, and the top of base 79 is provided with screw channel 80, the spiral shell
The bottom of bolt 78 is arranged in screw channel 80.
In the present invention, rotating shaft 81, diameter and the rotating shaft 81 of the spacing ring 71 are socketed with the spacing ring 71
Diameter is identical.The bolt 78 is threaded with self-locking nut 82, and the self-locking nut 82 is arranged on the second riffled tube
Between 77 and base 79.The quantity of the screw channel 80 is two.The shape size and second flange of the first flange 74
75 shape size is identical.
The operation principle of inflation mechanism of the present invention：In the present invention, nitrogen is generated by nitrogen gas generating device 6, and by blowing
Set 10 is exported, after mandrel trolley 5 is slided so that inflatable bar 11 contacts connection with set 10 of blowing, the contraction gas in set 10 of blowing
Capsule 22 is inflated expansion simultaneously so that air blowing set 10 and the clamping of inflatable bar 11 are simultaneously sealed, and such nitrogen is just output to inflatable bar
11, existing limit shaft 14 then is entered via connection flexible pipe 12 and swivel joint 13, nitrogen is input to core by existing limit shaft 14 again
In bar 4, so as to reach the effect purged to core bar gas transmission.In the present invention, in order to avoid nitrogen gas generating device 6 is during gas transmission
Shake, there is also mounted aligning device 7, by aligning device 7 output interface of nitrogen gas generating device 6 can be controlled to keep flat
Surely, so as to keep stable gas pressure.
The operation principle of aligning device 7 in the present invention：When needing fine setting, by turning bolt 8, by first flange 4 and the
Two flanges 5 are separated, the adjustment needed, then carry out the vertical direction of rotating shaft 12 by the connection of screw channel 10 and bolt 8
Position adjustment, merges finally by by first flange 4 with second flange 5, realizes that the position of rotating shaft 12 after fine setting is fixed.
It should be noted that above example is only to illustrate technical solution of the present invention rather than restriction technologies scheme, although
Applicant is explained in detail with reference to preferred embodiment to the present invention, it will be understood by those within the art that, those are right
Modification or equivalent substitution that technical solution of the present invention is carried out, it is impossible to depart from the objective and scope of the technical program, all should cover
Among scope of the invention as claimed.
Claims (10)
1. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism, including core bar to be processed（4）, it is characterised in that also
Including installed in core bar（4）On mandrel trolley（5）, the mandrel trolley（5）Slidably it is enclosed on core bar（4）On, described
Mandrel trolley（5）Top nitrogen gas generating device for producing nitrogen is installed（6）, in the nitrogen gas generating device（6）'s
Aligning device for adjusting the output interface position is installed on output interface（7）, in the aligning device（7）Shell
On be fixed with bearing block（8）, in the bearing block（8）On self-aligning bearing is installed（9）, the output interface passes through self-aligning bearing
（9）Covered with blowing（10）Hermetic seal is connected；It is being right against the set of blowing（10）Side be additionally provided with inflatable bar（11）, it is described to blow
Gas bar（11）Covered with blowing（10）In same horizontal line, the inflatable bar（11）Air inlet by connecting flexible pipe（12）With
Swivel joint（13）One end hermetic seal connection, the swivel joint（13）The other end and existing limit shaft（14）Rear end connection
And seal fixation, the existing limit shaft（14）Laterally it is laid in mandrel trolley（5）It is interior and it is interior set cavity, the existing limit shaft（14）
Front end and core bar（4）Connect and seal；The inflatable bar（11）Gas outlet in mandrel trolley（5）Covered after slip with blowing
（10）Sealing docking.
2. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 1, it is characterised in that described
Core bar（4）One end be located at mandrel trolley（5）It is interior, core bar（4）The other end be arranged on copper tube（15）It is interior, in the copper pipe
Strand（15）Termination on the inside of be also equipped with core head（16）, the core head（16）With core bar（4）Contact and push against.
3. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 2, it is characterised in that described
Mandrel trolley（5）Rectangular cross-section structure, in mandrel trolley（5）It is interior to be provided with installation passage（17）, the installation passage
（17）By adjacent first passage（18）And second channel（19）Constitute, wherein first passage（18）Internal diameter be more than second channel
（19）Internal diameter, the existing limit shaft（14）From mandrel trolley（5）Side stretch into first passage（18）It is interior, the core bar（4）
From mandrel trolley（5）Opposite side stretch into second channel（19）It is interior, in the second channel（19）Inwall on be also equipped with to
Few two groups of rolling bearings（20）, the mandrel trolley（5）Pass through corresponding rolling bearing（20）With core bar（4）Contact and keep can
Sliding mode.
4. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 3, it is characterised in that in institute
State second channel（19）Inwall on be additionally provided with snap ring（21）, described limit shaft（14）Pass through snap ring（21）With mandrel trolley
（5）Connect and position.
5. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 4, it is characterised in that in institute
State air blowing set（10）Contraction air bag for adjusting caliber is inside installed（22）, the contraction air bag（22）Inlet end and nitrogen
Generating means（6）Air cavity connection, the contraction air bag（22）In nitrogen gas generating device（6）Expansion state is kept during startup, institute
State contraction air bag（22）In nitrogen gas generating device（6）Shunk during closing and control inflatable bar（11）Covered with blowing（10）Depart from.
6. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 5, it is characterised in that described
Aligning device（7）Including spacing ring（71）, the spacing ring（71）It is by upper half annulus（72）With lower half annulus（73）Constitute, institute
State upper half annulus（71）Bottom two ends are provided with first flange（74）, the lower half annulus（73）Top two ends are provided with
Two flanges（75）, the first flange（74）Top is provided with the first riffled tube（76）, the second flange（75）Bottom is set
It is equipped with the second riffled tube（77）, first riffled tube（76）With the second riffled tube（77）And bolt（78）Screw thread connects
Connect, the spacing ring（71）Bottom is provided with base（79）, the base（79）Top is provided with screw channel（80）, the spiral shell
Bolt（78）Bottom is arranged on screw channel（80）It is interior.
7. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 6, it is characterised in that described
Spacing ring（71）Inside it is socketed with rotating shaft（81）, the spacing ring（71）Diameter and rotating shaft（81）Diameter it is identical.
8. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 7, it is characterised in that described
Bolt（78）It is threaded with self-locking nut（82）, the self-locking nut（82）It is arranged on the second riffled tube（77）With base
（79）Between.
9. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 8, it is characterised in that described
Screw channel（80）Quantity be two.
10. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 9, it is characterised in that institute
State first flange（74）Shape size and second flange（75）Shape size it is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710361403.2A CN106984649B (en) | 2017-05-22 | 2017-05-22 | A kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710361403.2A CN106984649B (en) | 2017-05-22 | 2017-05-22 | A kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106984649A true CN106984649A (en) | 2017-07-28 |
| CN106984649B CN106984649B (en) | 2018-06-26 |
Family
ID=59419666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710361403.2A Active CN106984649B (en) | 2017-05-22 | 2017-05-22 | A kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism |
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| Country | Link |
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| CN (1) | CN106984649B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108067502A (en) * | 2017-11-29 | 2018-05-25 | 鑫鹏源智能装备集团有限公司 | Antioxidant conveying device and its application method in the hot seamless tube operation of rolling |
| CN110695092A (en) * | 2019-10-23 | 2020-01-17 | 广东海亮铜业有限公司 | Uninterrupted nitrogen purging system |
| CN110695092B (en) * | 2019-10-23 | 2024-06-04 | 广东海亮铜业有限公司 | Uninterrupted nitrogen purging system |
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| US4928507A (en) * | 1984-09-01 | 1990-05-29 | Kocks Technik Gmbh & Co. | Methods and apparatus for manufacturing seamless tube |
| DE4015306C1 (en) * | 1990-05-12 | 1991-06-06 | Benteler Ag, 4790 Paderborn, De | Metal tube mfg. installation - has preformed, heated metal block removable from press before introduction of nitrogen gas |
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| CN202174106U (en) * | 2011-08-25 | 2012-03-28 | 江苏兴荣美乐铜业有限公司 | Anti-oxidation industrial gas sealing device of nonferrous metal tube bar planet rolling equipment |
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| DE2356985A1 (en) * | 1973-11-15 | 1975-05-22 | Kabel Metallwerke Ghh | Hot-rolled seamless metal tubes mfr. - esp. of copper and copper alloys, using water or gas to prevent oxidn |
| US4928507A (en) * | 1984-09-01 | 1990-05-29 | Kocks Technik Gmbh & Co. | Methods and apparatus for manufacturing seamless tube |
| DE4015306C1 (en) * | 1990-05-12 | 1991-06-06 | Benteler Ag, 4790 Paderborn, De | Metal tube mfg. installation - has preformed, heated metal block removable from press before introduction of nitrogen gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108067502A (en) * | 2017-11-29 | 2018-05-25 | 鑫鹏源智能装备集团有限公司 | Antioxidant conveying device and its application method in the hot seamless tube operation of rolling |
| CN108067502B (en) * | 2017-11-29 | 2023-06-27 | 鑫鹏源智能装备集团有限公司 | Antioxidant conveying device in hot rolling seamless pipe rolling process and use method thereof |
| CN110695092A (en) * | 2019-10-23 | 2020-01-17 | 广东海亮铜业有限公司 | Uninterrupted nitrogen purging system |
| CN110695092B (en) * | 2019-10-23 | 2024-06-04 | 广东海亮铜业有限公司 | Uninterrupted nitrogen purging system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106984649B (en) | 2018-06-26 |
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Denomination of invention: Nitrogen gas inflation mechanism for inner hole of casting blank of three-roll planetary mill Effective date of registration: 20190830 Granted publication date: 20180626 Pledgee: China Minsheng Banking Corp Zhengzhou branch Pledgor: Chongqing Longyu Precision Copper Tube Co., Ltd. Registration number: Y2019990000127 |
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