CN104056971B - Method and tool for tube expansion of fin cluster sectional type oil cooler - Google Patents
Method and tool for tube expansion of fin cluster sectional type oil cooler Download PDFInfo
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- CN104056971B CN104056971B CN201310671861.8A CN201310671861A CN104056971B CN 104056971 B CN104056971 B CN 104056971B CN 201310671861 A CN201310671861 A CN 201310671861A CN 104056971 B CN104056971 B CN 104056971B
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Abstract
The invention relates to a method and a tool for tube expansion of a fin cluster sectional type oil cooler and belongs to the technical field of tube expansion of oil coolers. The method comprises the following steps: positioning an oil tube arranged between a first section of fin cluster and a second section of fin cluster in the radial direction, in the axial direction of the fin cluster sectional type oil cooler oil tube, axially guiding the oil tube through a guide mechanism at one end in the axial direction of the oil tube of the fin cluster segmented oil cooler and carrying out tube expansion operation on the oil tube through an expansion rod and an expansion head at the other end till the tube expansion operation of the whole oil tube is finished. The method and the tool for the tube expansion of the fin cluster segmented oil cooler have the benefits that the difficult problem of expanded tube lamination is solved, the oil cooler has high heat exchange performance and good product appearance quality, the mounting position and the mounting size at the middle section are ensured at the same time, and moreover, the simultaneous expanded joint of a plurality of workpieces is also realized, so that the production efficiency is improved.
Description
Technical field
The present invention relates to tube expansion frock and the method thereof of a kind of bunch of stagewise oil cooler, belong to oil cooler tube expansion technique field.
Background technology
At present, the existing tube expansion technique that pushes away is all the unidirectional pretension of sheet bunch and the technique of the unidirectional contraction of oil pipe, easily produces fin irregular lamination defect, affects heat exchange property and the product appearance quality of oil cooler.
Summary of the invention
The present invention is directed to the deficiency of the problems referred to above, propose a kind of fin and will not produce the heat exchange property height of irregular lamination and oil cooler, the sheet bunch stagewise oil cooler expansion tube method of product appearance quality better.
The present invention solves that the technical scheme that above-mentioned technical problem proposes is: a kind of sheet bunch stagewise oil cooler expansion tube method, sheet bunch stagewise oil cooler includes oil pipe and the first paragraph fin bunch being distributed in outside oil pipe, second segment fin bunch；First paragraph fin bunch, second segment fin bunch are arranged along the length direction of oil pipe, and there is gap between the two, carry out the oil pipe being between first paragraph fin bunch, second segment fin bunch radially positioning, and in the axial direction of sheet bunch stagewise oil cooler oil pipe, one end uses guiding mechanism to carry out axially directed to oil pipe, the other end then uses expander roll swollen head that oil pipe is carried out tube expansion operation, until the tube expansion completing whole oil pipe operates.
Preferred: the radial direction location mode of the oil pipe between be set forth in first paragraph fin bunch, second segment fin bunch uses spring floating supporting mechanism to be positioned on base plate by oil pipe, and described spring floating supporting mechanism includes the first sliding support, the second sliding support, guide pin bushing limited block and limited support bar；Described guide pin bushing limited block, limited support bar is installed on base plate, described limited support bar is for limiting the first sliding support to the movement of fixing supporting mechanism, and described guide pin bushing limited block one end is provided with spacing guide pillar, described first sliding support, second sliding support ecto-entad is set in turn on spacing guide pillar, described first sliding support, second sliding support is slidably connected with base plate by spacing guide pillar, and described second sliding support with guide pin bushing limited block between be provided with back-moving spring, the most described first sliding support, second sliding support is provided with the second oil pipe and fixes groove.
Preferred: described guiding mechanism is fixing supporting mechanism, described fixing supporting mechanism includes fixed plate, regulation alignment pin and fixing fagging, it is provided with one on described fixing fagging and groove fixed by above the first oil pipe for the axially directed support of oil pipe, described fixed plate, fixing fagging are arranged on base plate, and described oil pipe to fix the plane at groove place perpendicular with the plane at fixed plate place, and described regulation alignment pin is arranged at the first oil pipe fixes in groove, and it is fixed in fixed plate.
The present invention also provides for a kind of sheet bunch stagewise oil cooler tube expansion frock, including press plate mechanism, base plate, fixing supporting mechanism and spring floating supporting mechanism, described fixing supporting mechanism is arranged at one end of base plate, and described spring floating supporting mechanism is arranged at the other end of base plate, and described press plate mechanism is oppositely arranged with spring floating supporting mechanism；Described press plate mechanism is for carrying out tube expansion by the swollen head of expander roll to oil pipe, and described fixing supporting mechanism is for carrying out axially directed to oil pipe, and described spring floating supporting mechanism positions for the oil pipe between first paragraph fin bunch, second segment fin bunch carries out radial direction.
Further: also include that panel, described panel are arranged on base plate, and between fixing supporting mechanism and spring floating supporting mechanism.
Preferred: described press plate mechanism includes the swollen head of pretension pressing plate, expander roll and synchronizes limited block, the start termination of described expander roll is swollen head is arranged at pretension pressing plate, and described synchronization limited block is arranged at the both sides of start termination of pretension pressing plate.
Preferred: described fixing supporting mechanism includes fixed plate, regulation alignment pin and fixing fagging, it is provided with one on described fixing fagging and groove fixed by above the first oil pipe for the axially directed support of oil pipe, described fixed plate, fixing fagging are arranged on base plate, and described oil pipe to fix the plane at groove place perpendicular with the plane at fixed plate place, and described regulation alignment pin is arranged at the first oil pipe fixes in groove, and it is fixed in fixed plate.
Preferred: described spring floating supporting mechanism includes the first sliding support, the second sliding support, guide pin bushing limited block and limited support bar；Described guide pin bushing limited block, limited support bar is installed on base plate, described limited support bar is for limiting the first sliding support to the movement of fixing supporting mechanism, and described guide pin bushing limited block one end is provided with spacing guide pillar, described first sliding support, second sliding support ecto-entad is set in turn on spacing guide pillar, described first sliding support, second sliding support is slidably connected with base plate by spacing guide pillar, and described second sliding support with guide pin bushing limited block between be provided with back-moving spring, the most described first sliding support, second sliding support is provided with one and groove fixed by above the second oil pipe that radially location supports for oil pipe, and groove fixed by described first oil pipe and the second oil pipe to fix groove corresponding.
Preferred: the two sides of described spring floating supporting mechanism are additionally provided with support guide block, described support guide block is arranged on base plate.
Preferred: described limited support bar is arranged at the outside of guide pin bushing limited block, and limited support bar stretches out to one end of spacing guide pillar, and the length stretched out of described limited support bar is equal to the thickness of the second sliding support, the length of the most described first sliding support is more than the length of the second sliding support.
nullA kind of sheet bunch stagewise oil cooler expansion tube method of the present invention，Compared to existing technology，Have the advantages that 1. owing to first paragraph fin bunch will be in、Oil pipe between second segment fin bunch carries out radially positioning，And in the axial direction of sheet bunch stagewise oil cooler oil pipe，One end uses guiding mechanism to carry out axially directed to oil pipe，The other end then uses expander roll swollen head that oil pipe is carried out tube expansion operation，Until the tube expansion completing whole oil pipe operates，When therefore using，Have only to that first paragraph fin bunch (or second segment fin bunch) is placed on guiding mechanism and carry out axially directed，And oil pipe carries out radially positioning，Therefore when the swollen head of expander roll carries out tube expansion to sheet bunch stagewise oil cooler，First second segment fin bunch (or first paragraph fin bunch) is carried out tube expansion，Owing to the radial direction of oil pipe positions，Therefore oil pipe shrinkage direction is with pushing away swollen direction，Swollen complete second segment fin bunch (or first paragraph fin bunch) the swollen head of expander roll afterwards continues traveling downwardly，Owing to the radial direction of oil pipe positions and first paragraph fin bunch (or second segment fin bunch) axially directed，Now first paragraph fin bunch (or second segment fin bunch) head swollen with expander roll traffic direction becomes opposite direction to shrink，Therefore the fin of the present invention will not produce irregular lamination，Thus the heat exchange property of its oil cooler is high、Product appearance quality better，Solve a difficult problem for tube expansion lamination，Ensure that interlude installation site size simultaneously，But also achieve many workpiece expanded joint simultaneously，Improve production efficiency.
null2. owing to being provided with press plate mechanism、Base plate、Fixing supporting mechanism and spring floating supporting mechanism，When therefore using，Have only to that first paragraph fin bunch (or second segment fin bunch) is placed on fixing supporting mechanism and carry out axially directed，And oil pipe is put into spring floating supporting mechanism and carries out radially positioning，Therefore when the swollen head of expander roll carries out tube expansion to sheet bunch stagewise oil cooler，First second segment fin bunch (or first paragraph fin bunch) is carried out tube expansion，Owing to the radial direction of oil pipe positions，Therefore oil pipe shrinkage direction is with pushing away swollen direction，Swollen complete second segment fin bunch (or first paragraph fin bunch) the swollen head of expander roll afterwards continues traveling downwardly，Owing to the radial direction of oil pipe positions and first paragraph fin bunch (or second segment fin bunch) axially directed，Now first paragraph fin bunch (or second segment fin bunch) head swollen with expander roll traffic direction becomes opposite direction to shrink，Therefore the fin of the present invention will not produce irregular lamination，Thus the heat exchange property of its oil cooler is high、Product appearance quality better，Solve a difficult problem for tube expansion lamination，Ensure that interlude installation site size simultaneously.
3. fix groove owing to being provided with one and first and second above oil pipe, therefore can many workpiece expanded joints simultaneously, improve production efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention；
Fig. 2 is the partial enlarged drawing of Fig. 1；
Wherein: 1. pretension pressing plate；2. synchronize limited block；3. the swollen head of expander roll；4. support guide block；5. the first sliding support；6. limited support bar；7. guide pin bushing limited block；8. panel；9. base plate；10. fixed plate；11. regulation alignment pins；12. fix fagging；13. slices bunches of stagewise oil coolers；14. second sliding supports；15. spacing guide pillars；16. return springs.
Detailed description of the invention
Accompanying drawing discloses the structural representation of a preferred embodiment of the invention without limitation, explains technical scheme below with reference to accompanying drawing.
Embodiment
A kind of sheet bunch stagewise oil cooler expansion tube method of the present embodiment, as shown in Figure 1, 2, sheet bunch stagewise oil cooler includes oil pipe and the first paragraph fin bunch being distributed in outside oil pipe, second segment fin bunch；First paragraph fin bunch, second segment fin bunch are arranged along the length direction of oil pipe, and there is gap between the two, carry out the oil pipe being between first paragraph fin bunch, second segment fin bunch radially positioning, and in the axial direction of sheet bunch stagewise oil cooler oil pipe, one end uses guiding mechanism to carry out axially directed to oil pipe, the other end then uses expander roll swollen head that oil pipe is carried out tube expansion operation, until the tube expansion completing whole oil pipe operates.
The radial direction location mode of the oil pipe between be set forth in first paragraph fin bunch, second segment fin bunch uses spring floating supporting mechanism to be positioned on base plate by oil pipe, and described spring floating supporting mechanism includes the first sliding support, the second sliding support, guide pin bushing limited block and limited support bar；Described guide pin bushing limited block, limited support bar is installed on base plate, described limited support bar is for limiting the first sliding support to the movement of fixing supporting mechanism, and described guide pin bushing limited block one end is provided with spacing guide pillar, described first sliding support, second sliding support ecto-entad is set in turn on spacing guide pillar, described first sliding support, second sliding support is slidably connected with base plate by spacing guide pillar, and described second sliding support with guide pin bushing limited block between be provided with back-moving spring, the most described first sliding support, second sliding support is provided with the second oil pipe and fixes groove.
Described guiding mechanism is fixing supporting mechanism, described fixing supporting mechanism includes fixed plate, regulation alignment pin and fixing fagging, it is provided with one on described fixing fagging and groove fixed by above the first oil pipe for the axially directed support of oil pipe, described fixed plate, fixing fagging are arranged on base plate, and described oil pipe to fix the plane at groove place perpendicular with the plane at fixed plate place, and described regulation alignment pin is arranged at the first oil pipe fixes in groove, and it is fixed in fixed plate.
A kind of sheet bunch stagewise oil cooler tube expansion frock, as shown in Figure 1, 2, including press plate mechanism, base plate, fixing supporting mechanism and spring floating supporting mechanism, described fixing supporting mechanism is arranged at one end of base plate, and described spring floating supporting mechanism is arranged at the other end of base plate, and described press plate mechanism is oppositely arranged with spring floating supporting mechanism；Described press plate mechanism is for carrying out tube expansion by the swollen head of expander roll to oil pipe, and described fixing supporting mechanism is for carrying out axially directed to oil pipe, and described spring floating supporting mechanism positions for the oil pipe between first paragraph fin bunch, second segment fin bunch carries out radial direction.
Also include that panel, described panel are arranged on base plate, and between fixing supporting mechanism and spring floating supporting mechanism.
Described press plate mechanism includes the swollen head of pretension pressing plate, expander roll and synchronizes limited block, the start termination of described expander roll is swollen head is arranged at pretension pressing plate, and described synchronization limited block is arranged at the both sides of start termination of pretension pressing plate.
Described fixing supporting mechanism includes fixed plate, regulation alignment pin and fixing fagging, it is provided with one on described fixing fagging and groove fixed by above the first oil pipe for the axially directed support of oil pipe, described fixed plate, fixing fagging are arranged on base plate, and described oil pipe to fix the plane at groove place perpendicular with the plane at fixed plate place, and described regulation alignment pin is arranged at the first oil pipe fixes in groove, and it is fixed in fixed plate.
Described spring floating supporting mechanism includes the first sliding support, the second sliding support, guide pin bushing limited block and limited support bar；Described guide pin bushing limited block, limited support bar is installed on base plate, described limited support bar is for limiting the first sliding support to the movement of fixing supporting mechanism, and described guide pin bushing limited block one end is provided with spacing guide pillar, described first sliding support, second sliding support ecto-entad is set in turn on spacing guide pillar, described first sliding support, second sliding support is slidably connected with base plate by spacing guide pillar, and described second sliding support with guide pin bushing limited block between be provided with back-moving spring, the most described first sliding support, second sliding support is provided with one and groove fixed by above the second oil pipe that radially location supports for oil pipe, and groove fixed by described first oil pipe and the second oil pipe to fix groove corresponding.
The two sides of described spring floating supporting mechanism are additionally provided with support guide block, and described support guide block is arranged on base plate.
Described limited support bar is arranged at the outside of guide pin bushing limited block, and limited support bar stretches out to one end of spacing guide pillar, and the length stretched out of described limited support bar is equal to the thickness of the second sliding support, the length of the most described first sliding support is more than the length of the second sliding support.
Groove fixed by described first oil pipe, the second oil pipe is fixed the number of groove and is four.
A kind of sheet bunch stagewise oil cooler tube expansion frock of the present embodiment, during use, first oil pipe one end comes to the regulation alignment pin in fixed plate, and press plate mechanism (include pretension pressing plate, synchronize limited block) is descending forms the elastic equilibrium pretension to first paragraph fin bunch with spring floating supporting mechanism (including the first sliding support, spacing guide pillar, the second sliding support, spring, support guide block).
Then, then swollen of expander roll is descending pushes away swollen first paragraph fin bunch, until the first sliding support comes to limited support bar, completes first paragraph sheet bunch tube expansion, and contraction change head swollen with the expander roll traffic direction of this tube expansion process tubing length is consistent.
Finally, push away swollen second segment fin bunch, second sliding support forms the elastic equilibrium pretension to second segment fin bunch with fixing fagging, because of the both sides limited support bar position-limiting action to the first sliding support, make the fin bunch that first paragraph swelling is good the most descending, so oil pipe is also because of swelling and the position-limiting action of first paragraph the most descending (be similar to and suspended on), it is descending that expander roll is swollen, oil pipe starts to shrink at and shortens, now regulation alignment pin no longer supports oil pipe effect, one section of space is formed between oil pipe pipe end and regulation alignment pin after swollen complete full journey, i.e. tubing length shrinks and changes, head traffic direction swollen with expander roll becomes opposite direction.
It is merely to illustrate embodiments of the present invention above in conjunction with the preferred embodiment of the present invention described by accompanying drawing; not as to aforementioned invention purpose and claims content and the restriction of scope; every technical spirit according to the present invention, to any simple modification made for any of the above embodiments, equivalent variations and modification, the most still belongs to the technology of the present invention and rights protection category.
Claims (5)
1.A kind of sheet bunch stagewise Oil cooler expansion tube method, sheet bunch stagewise oil cooler includes oil pipe and the first paragraph fin bunch being distributed in outside oil pipe, second segment fin bunch；First paragraph fin bunch, second segment fin bunch are arranged along the length direction of oil pipe, and there is gap between the two, it is characterized in that: carry out the oil pipe being between first paragraph fin bunch, second segment fin bunch radially positioning, and in the axial direction of sheet bunch stagewise oil cooler oil pipe, one end uses guiding mechanism to carry out axially directed to oil pipe, the other end then uses expander roll swollen head that oil pipe is carried out tube expansion operation, until the tube expansion completing whole oil pipe operates.
2.According to claim 1 Described bunch of stagewise oil cooler expansion tube method, it is characterized in that: described in the radial direction location mode of oil pipe that is between first paragraph fin bunch, second segment fin bunch use spring floating supporting mechanism to be positioned on base plate by oil pipe, described spring floating supporting mechanism includes the first sliding support, the second sliding support, guide pin bushing limited block and limited support bar；Described guide pin bushing limited block, limited support bar is installed on base plate, described limited support bar is for limiting the first sliding support to the movement of fixing supporting mechanism, and described guide pin bushing limited block one end is provided with spacing guide pillar, described first sliding support, second sliding support ecto-entad is set in turn on spacing guide pillar, described first sliding support, second sliding support is slidably connected with base plate by spacing guide pillar, and described second sliding support with guide pin bushing limited block between be provided with back-moving spring, the most described first sliding support, second sliding support is provided with more than one the second oil pipe that radially location supports for oil pipe and fixes groove.
3.According to claim 2 Described bunch of stagewise oil cooler expansion tube method, it is characterized in that: described guiding mechanism is fixing supporting mechanism, described fixing supporting mechanism includes fixed plate, regulation alignment pin and fixing fagging, it is provided with more than one the first oil pipe for the axially directed support of oil pipe on described fixing fagging and fixes groove, described fixed plate, fixing fagging are arranged on base plate, and described first oil pipe to fix the plane at groove place perpendicular with the plane at fixed plate place, and described regulation alignment pin is arranged at the first oil pipe fixes in groove, and it is fixed in fixed plate.
4.A kind of based on claim 1 The sheet bunch stagewise oil cooler tube expansion frock of described sheet bunch stagewise oil cooler expansion tube method, it is characterised in that : Including press plate mechanism, base plate, fixing supporting mechanism and spring floating supporting mechanism, described fixing supporting mechanism is arranged at one end of base plate, and described spring floating supporting mechanism is arranged at the other end of base plate, and described press plate mechanism is oppositely arranged with spring floating supporting mechanism；Described press plate mechanism is for carrying out tube expansion by the swollen head of expander roll to oil pipe, and described fixing supporting mechanism is for carrying out axially directed to oil pipe, and described spring floating supporting mechanism positions for the oil pipe between first paragraph fin bunch, second segment fin bunch carries out radial direction；Described press plate mechanism includes the swollen head of pretension pressing plate, expander roll and synchronizes limited block, the start termination of described expander roll is swollen head is arranged at pretension pressing plate, and described synchronization limited block is arranged at the both sides of start termination of pretension pressing plate.
5.According to claim 4 Described bunch of stagewise oil cooler tube expansion frock, it is characterised in that: also include that panel, described panel are arranged on base plate, and between fixing supporting mechanism and spring floating supporting mechanism；Described fixing supporting mechanism includes fixed plate, regulation alignment pin and fixing fagging, it is provided with more than one the first oil pipe for the axially directed support of oil pipe on described fixing fagging and fixes groove, described fixed plate, fixing fagging are arranged on base plate, and described first oil pipe to fix the plane at groove place perpendicular with the plane at fixed plate place, and described regulation alignment pin is arranged at the first oil pipe fixes in groove, and it is fixed in fixed plate；Described spring floating supporting mechanism includes the first sliding support, the second sliding support, guide pin bushing limited block and limited support bar；Described guide pin bushing limited block, limited support bar is installed on base plate, described limited support bar is for limiting the first sliding support to the movement of fixing supporting mechanism, and described guide pin bushing limited block one end is provided with spacing guide pillar, described first sliding support, second sliding support ecto-entad is set in turn on spacing guide pillar, described first sliding support, second sliding support is slidably connected with base plate by spacing guide pillar, and described second sliding support with guide pin bushing limited block between be provided with back-moving spring, the most described first sliding support, second sliding support is provided with more than one the second oil pipe that radially location supports for oil pipe and fixes groove, and groove fixed by described first oil pipe and the second oil pipe to fix groove corresponding；Described limited support bar is arranged at the outside of guide pin bushing limited block, and limited support bar stretches out to one end of spacing guide pillar, and the length stretched out of described limited support bar is equal to the thickness of the second sliding support, the length of the most described first sliding support is more than the length of the second sliding support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310671861.8A CN104056971B (en) | 2013-12-11 | 2013-12-11 | Method and tool for tube expansion of fin cluster sectional type oil cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310671861.8A CN104056971B (en) | 2013-12-11 | 2013-12-11 | Method and tool for tube expansion of fin cluster sectional type oil cooler |
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| Publication Number | Publication Date |
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| CN104056971A CN104056971A (en) | 2014-09-24 |
| CN104056971B true CN104056971B (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310671861.8A Active CN104056971B (en) | 2013-12-11 | 2013-12-11 | Method and tool for tube expansion of fin cluster sectional type oil cooler |
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| US4780955A (en) * | 1987-05-20 | 1988-11-01 | Crown Unlimited Machine, Inc. | Apparatus for making a tube and fin heat exchanger |
| JPH09141353A (en) * | 1995-11-17 | 1997-06-03 | Matsushita Refrig Co Ltd | Manufacture of fin and tube type heat exchanger |
| CN1330576A (en) * | 1999-11-10 | 2002-01-09 | 日高精机株式会社 | Method and device for expanding heat transfer tube of heat exchanger |
| CN1575403A (en) * | 2001-10-22 | 2005-02-02 | 昭和电工株式会社 | Finned tube for heat exchangers, heat exchanger, process for producing heat exchanger finned tube, and process for fabricating heat exchanger |
| CN201267848Y (en) * | 2008-10-29 | 2009-07-08 | 北京上佳蓝基制冷设备有限公司 | Multi-standard horizontal type pipe-expanding machine |
| CN203711662U (en) * | 2013-12-11 | 2014-07-16 | 南通江华热动力机械有限公司 | Piece cluster segmented oil cooler pipe expanding tooling |
-
2013
- 2013-12-11 CN CN201310671861.8A patent/CN104056971B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4780955A (en) * | 1987-05-20 | 1988-11-01 | Crown Unlimited Machine, Inc. | Apparatus for making a tube and fin heat exchanger |
| JPH09141353A (en) * | 1995-11-17 | 1997-06-03 | Matsushita Refrig Co Ltd | Manufacture of fin and tube type heat exchanger |
| CN1330576A (en) * | 1999-11-10 | 2002-01-09 | 日高精机株式会社 | Method and device for expanding heat transfer tube of heat exchanger |
| CN1575403A (en) * | 2001-10-22 | 2005-02-02 | 昭和电工株式会社 | Finned tube for heat exchangers, heat exchanger, process for producing heat exchanger finned tube, and process for fabricating heat exchanger |
| CN201267848Y (en) * | 2008-10-29 | 2009-07-08 | 北京上佳蓝基制冷设备有限公司 | Multi-standard horizontal type pipe-expanding machine |
| CN203711662U (en) * | 2013-12-11 | 2014-07-16 | 南通江华热动力机械有限公司 | Piece cluster segmented oil cooler pipe expanding tooling |
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| CN104056971A (en) | 2014-09-24 |
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Effective date of registration: 20201130 Address after: No.226300, Nantong Road, Tongzhou, Jiangsu Province Patentee after: Jiangsu Tongshun Power Technology Co., Ltd Address before: 226300 Tongzhou District Economic Development Zone, Jiangsu, Nantong Patentee before: NANTONG JIANGHUA THERMAL POWER MACHINERY Co.,Ltd. |
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