CN106984649B - 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
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- CN106984649B CN106984649B CN201710361403.2A CN201710361403A CN106984649B CN 106984649 B CN106984649 B CN 106984649B CN 201710361403 A CN201710361403 A CN 201710361403A CN 106984649 B CN106984649 B CN 106984649B
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- core bar
- rolling mill
- mandrel trolley
- nitrogen
- bar
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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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Abstract
Invention describes a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanisms, it includes core bar and mandrel trolley to be processed, mandrel trolley is slidably sleeved on core bar, nitrogen gas generating device for generating 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 on the shell of aligning device, self-aligning bearing is installed on bearing block, output interface is connect by self-aligning bearing with set hermetic seal of blowing；Inflatable bar is additionally provided with being right against the side for blowing set, the air inlet of inflatable bar is connected by one end hermetic seal of connection flexible pipe and rotary joint, the other end of rotary joint and the rear end of limit shaft connect and seal fixation, and the front end of the limit shaft connects and seals with core bar.The present invention solves the leakage problem in air blowing process, and installation is 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 mating copper pipe in the processing of air-conditioning, it has directly the quality of product
Influence, therefore when manufacturing copper pipe, to pass through multiple tracks production process, wherein, to the purging of copper tube inner wall core bar
Just it is important a ring.As shown in Figure 1, now at present when being purged to copper tube inner wall core bar, using in copper pipe
The former limit shaft 1 of outer sheath one, air channel 2 is offered on former limit shaft 1, in purging, the correspondence on copper pipe is needed to open up
Multiple ventholes 3, and make venthole 3 and 2 face of air channel on former limit shaft 1, the nitrogen being blown into enters logical through air channel 2
In stomata 3, further copper tube inner wall is purged.But this mode there are it is apparent the defects of, due to limit shaft
It is rigid connection between strand copper pipe, therefore inevitably can be easily leaked there are gap between one side limit shaft and strand copper pipe
On the other hand gas rotates copper tube in purge due to needing, due to limit shaft be difficult to copper pipe it is fully synchronized,
Will appear the situation of air channel and venthole dislocation, thus further increase the risk of gas leakage, once and gas leak,
It will so that inner inflatable amount is insufficient, air pressure reduces, therefore it cannot be guaranteed the pressure and flow in nitrogen to core bar, cause nitrogen
Throughput, insufficient pressure, tube rolling inner wall is oxidizable, and oxidation causes product unqualified.
Invention content
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 into
It during row purging the problem of easy gas leakage, and introduces that a kind of air-tightness is preferable, can ensure in the three-roller planetary rolling mill strand of air pressure
Hole nitrogen gas filling technology.
Technical scheme of the present invention：A kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism, including core to be processed
Bar, which is characterized in that the mandrel trolley on core bar is further included, the mandrel trolley is slidably sleeved on core bar,
Nitrogen gas generating device for generating nitrogen above the mandrel trolley is installed, is connect in the output of the nitrogen gas generating device
Aligning device for adjusting the output interface position on mouth is installed, bearing is fixed on the shell of the aligning device
Seat, is equipped with self-aligning bearing on the bearing block, and the output interface is connect 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 at set of blowing in same horizontal line, described to blow
The air inlet of gas bar is connected by one end hermetic seal of connection flexible pipe and rotary joint, the other end of the rotary joint and existing limit
The rear end of position axis 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 axis connects and seals with core bar；The gas outlet of the inflatable bar covers sealing pair after mandrel trolley slip with blowing
It connects.
Optimally, one end of the core bar is set in mandrel trolley, and the other end of core bar is mounted in copper tube, in institute
It states and is also equipped with core head on the inside of the end of copper tube, the core head is contacted and pushed against with core bar.Here core bar directly from
Copper tube is from molding is made, it is characteristic of the invention that being not required in addition open up venthole on core bar, therefore the core bar ensured is complete
Whole property, while sealing effect is also more preferable.
Optimally, the rectangular cross-section structure of the mandrel trolley is equipped with installation passage, the peace in mandrel trolley
Dress channel is made 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
It states 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 leads to
In road, at least two groups of rolling bearings, the mandrel trolley are also equipped on the inner wall of the second channel and 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 mating inflation mechanism, and on the one hand it is slided conveniently can
It is matched with core bar, while also there is ventilation turn-on effect well.
Optimally, snap ring is additionally provided on the inner wall of the second channel, the limit shaft is small with core bar by snap ring
Vehicle is connected and is positioned.Limit shaft can be positioned by the snap ring, gas leakage happens after avoiding the occurrence of shaking and connecting.
Optimally, the contraction air bag for adjusting caliber, the air inlet for shrinking 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 inflatable bar is controlled to be detached from set of blowing.It here can be with by shrinking air bag
Realize that the automatic of set of blowing opens and shrink, so as to have the function that control the connection sealing of inflatable bar and set of blowing.
Optimally, the aligning device includes spacing ring, and the spacing ring is made of upper half annulus and lower half annulus, institute
It states upper half annulus bottom both ends and is both provided with first flange, both ends are both provided with second flange at the top of the lower half annulus, described
It is provided with the first riffled tube at the top of first flange, the second flange bottom is provided with the second riffled tube, in described first
Screwed pipe and the second riffled tube are connect with bolt thread, and the spacing ring bottom is provided with pedestal, 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 balances, so as to ensure the stability under the working condition of equipment.
Optimally, shaft, the diameter of the spacing ring and the diameter phase of shaft are socketed in the spacing ring
Together.Here it is that the precision of equipment is improved for the ease of installation using the 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 is identical with the shape size of second flange.The present invention is using identical
The flange of shape is the cost of manufacture for control device, while is also beneficial to reduce the cost that post facility is safeguarded.
Relative to the prior art, the invention has the advantages that：
1st, gas leakage is solved the problems, such as, the present invention uses the connection mode of rotary joint, can be with copper when being purged
Pipe rotates synchronously, and uses soft connection, can ensure the stabilization of air pressure to avoid the generation of gas leak phenomenon, thoroughly solves
In purge the problem of gas leakage, it is very helpful to the promotion of product quality.
2nd, installation is easy to connect, and the rotary joint overall structure that the present invention uses 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, has good reliability, and failure 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 tuning of countershaft vertical direction is realized, while spacing ring, first flange and second flange realize shaft after fine tuning
Position fix.
Description of the drawings
Fig. 1 is Integral connection structure when being purged in the prior art to copper pipe；
Fig. 2 is attachment structure schematic diagram used by purging process of the 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 vertical view of aligning device in the present invention；
Structure sectional views of the Fig. 6 for set of blowing in the present invention.
In figure, 1-original limit shaft, 2-air channel, 3-venthole, 4-core bar, 5-mandrel trolley, the generation of 6-nitrogen
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-pedestal, 80-screw channel, 81-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-existing limit shaft, 15-copper tube, 16-core head, 17-installation passage, 18-first passage, 19-the
Two channels, 20-rolling bearing, 21-snap ring, 22-contraction air bag, 23-three-roller planetary rolling mill.
Specific 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, further includes the mandrel trolley 5 on core bar 4, and the mandrel trolley 5 is slidably sleeved on
On core bar 4, the nitrogen gas generating device 6 for generating nitrogen in the top of the mandrel trolley 5 is installed, is 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 on 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 connect 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 passes through connection flexible pipe 12 and one end of rotary joint 13
Hermetic seal connects, and the other end of the rotary joint 13 connect with the rear end of existing limit shaft 14 and seals fixation, the existing limiting
Axis 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 seals with core bar 4；Institute
It is docked after the slip of mandrel trolley 5 with 10 sealing of set of blowing the gas outlet for stating inflatable bar 11.In the present invention, nitrogen gas generating device 6
Using existing apparatus, it can produce the nitrogen of required air pressure and output.
Further, one end of the core bar 4 is set in mandrel trolley 5, and the other end of core bar 4 is mounted on copper tube 15
It is interior, core head 16 is also equipped on the inside of the end of the copper tube 15, the core head 16 is contacted and pushed against with core bar 4.
The rectangular cross-section structure of the mandrel trolley 5, is equipped with installation passage 17 in the mandrel trolley 5, the installation passage 17 by
Adjacent first passage 18 and second channel 19 is formed, and wherein the internal diameter of first passage 18 is more than the internal diameter of second channel 19, institute
It states existing limit shaft 14 to stretch into first passage 18 from the side of mandrel trolley 5, the opposite side of core bar 4 from the mandrel trolley 5 is stretched
Enter in second channel 19, it is small that at least two groups of rolling bearings 20, the core bar are also equipped on the inner wall of the second channel 19
Vehicle 5 is contacted with core bar 4 by corresponding rolling bearing 20 and keeps slidably state.On the inner wall of the second channel 19
Snap ring 21 is additionally provided with, the limit shaft 14 is connect 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 shrink when nitrogen gas generating device 6 is closed and control inflatable bar 11 and 10 disengaging of set of blowing.It is logical
The leakproofness after blow set 10 and the connection of inflatable bar 11 can effectively be improved, while can also take off automatically by crossing the contraction air bag 22
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 formed, and the 71 bottom both ends of upper half annulus are both provided with first flange 74, the lower half
73 top both ends of annulus are both provided with second flange 75, and 74 top of first flange is provided with the first riffled tube 76, described
75 bottom of second flange is provided with the second riffled tube 77, and 76 and second riffled tube 77 of the first riffled tube is and bolt
78 are threadedly coupled, and 71 bottom of spacing ring is provided with pedestal 79, and 79 top of pedestal is provided with screw channel 80, the spiral shell
78 bottom of bolt is arranged in screw channel 80.
In the present invention, shaft 81, diameter and the shaft 81 of the spacing ring 71 are socketed in 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 pedestal 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, and by blowing by nitrogen gas generating device 6
10 output of set, after mandrel trolley 5 slides so that inflatable bar 11 is connected 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 11 clamping of inflatable bar simultaneously seal, and such nitrogen is just output to inflatable bar
11, existing limit shaft 14 then is entered via connection flexible pipe 12 and rotary joint 13, nitrogen is input to core by existing limit shaft 14 again
In bar 4, so as to achieve the effect that purge to core bar gas transmission.In the present invention, in order to avoid nitrogen gas generating device 6 is during gas transmission
Shake, aligning device 7 is also mounted, the output interface of nitrogen gas generating device 6 can be controlled to keep flat by aligning device 7
Surely, so as to keep stable gas pressure.
The operation principle of aligning device 7 in the present invention：Need fine tuning when, by turning bolt 78, by first flange 74 with
Second flange 75 separates, the adjustment needed, then carries out 81 Vertical Square of shaft by the connection of screw channel 80 and bolt 78
To position adjust, merge finally by by first flange 74 with second flange 75, realize that the position of shaft 81 is fixed after finely tuning.
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 the present invention with reference to preferred embodiment, it will be understood by those of ordinary skill in the art that, those are right
The modification or equivalent replacement that technical solution of the present invention carries out, it is impossible to be detached from the objective and range of the technical program, should all cover
In 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）, which is characterized in that also
Including being mounted on core bar（4）On mandrel trolley（5）, the mandrel trolley（5）Slidably it is sleeved on core bar（4）On, described
Mandrel trolley（5）Top nitrogen gas generating device for generating 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）It is covered with blowing（10）Hermetic seal connects；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）It is covered with blowing（10）In same horizontal line, the inflatable bar（11）Air inlet pass through connection flexible pipe（12）With
Rotary joint（13）One end hermetic seal connection, the rotary joint（13）The other end and existing limit shaft（14）Rear end connection
And fixation is sealed, 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）It connects and seals；The inflatable bar（11）Gas outlet in mandrel trolley（5）It is 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, which is characterized in that described
Core bar（4）One end be set on mandrel trolley（5）It is interior, core bar（4）The other end be mounted on copper tube（15）It is interior, in the copper pipe
Strand（15）End on the inside of be also equipped with core head（16）, the core head（16）With core bar（4）It contacts and pushes against.
3. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 2, which is characterized in that described
Mandrel trolley（5）Rectangular cross-section structure, in mandrel trolley（5）It is interior to be equipped with installation passage（17）, the installation passage
（17）By adjacent first passage（18）And second channel（19）It forms, 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）Inner wall 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）It contacts and keep can
Sliding mode.
4. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 3, which is characterized in that in institute
State second channel（19）Inner wall on be additionally provided with snap ring（21）, the existing limit shaft（14）Pass through snap ring（21）With mandrel trolley
（5）It connects and positions.
5. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 4, which is characterized 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）It is shunk during closing and controls inflatable bar（11）It is covered with blowing（10）It is detached from.
6. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 5, which is characterized 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）It forms, institute
State upper half annulus（71）Bottom both ends are both provided with first flange（74）, the lower half annulus（73）Top both ends are both 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
It connects, the spacing ring（71）Bottom is provided with pedestal（79）, the pedestal（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, which is characterized in that described
Spacing ring（71）Inside it is socketed with shaft（81）, the spacing ring（71）Diameter and shaft（81）Diameter it is identical.
8. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 7, which is characterized 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 pedestal
（79）Between.
9. a kind of three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 8, which is characterized in that described
Screw channel（80）Quantity be two.
A kind of 10. three-roller planetary rolling mill strand endoporus nitrogen inflation mechanism according to claim 9, which is characterized 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 |
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| Publication Number | Publication Date |
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| CN106984649A CN106984649A (en) | 2017-07-28 |
| CN106984649B true CN106984649B (en) | 2018-06-26 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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| 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 |
| CN2754760Y (en) * | 2004-12-03 | 2006-02-01 | 佛山市顺德区冠邦科技有限公司 | Cool and oxidation preventor of planetary pipe bar roller |
| CN101767114A (en) * | 2009-12-23 | 2010-07-07 | 攀枝花新钢钒股份有限公司 | Method for removing oxide skin in tube blank of seamless steel tube |
| 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 |
| CN204710849U (en) * | 2015-05-07 | 2015-10-21 | 曹县爱伦金属加工有限公司 | A kind of copper pipe rolling nitrogen purging device |
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2017
- 2017-05-22 CN CN201710361403.2A patent/CN106984649B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN2754760Y (en) * | 2004-12-03 | 2006-02-01 | 佛山市顺德区冠邦科技有限公司 | Cool and oxidation preventor of planetary pipe bar roller |
| CN101767114A (en) * | 2009-12-23 | 2010-07-07 | 攀枝花新钢钒股份有限公司 | Method for removing oxide skin in tube blank of seamless steel tube |
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| CN106984649A (en) | 2017-07-28 |
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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 |