CN102900663A - Cylinder sleeve and manufacturing method thereof - Google Patents
Cylinder sleeve and manufacturing method thereof Download PDFInfo
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- CN102900663A CN102900663A CN2012103659331A CN201210365933A CN102900663A CN 102900663 A CN102900663 A CN 102900663A CN 2012103659331 A CN2012103659331 A CN 2012103659331A CN 201210365933 A CN201210365933 A CN 201210365933A CN 102900663 A CN102900663 A CN 102900663A
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- layer
- cylinder sleeve
- sintering
- internal layer
- metal tube
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000005245 sintering Methods 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000003082 abrasive agent Substances 0.000 claims description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 229910052804 chromium Inorganic materials 0.000 claims description 12
- 239000011651 chromium Substances 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 8
- 238000000576 coating method Methods 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract 2
- 239000000047 product Substances 0.000 description 10
- 239000002699 waste material Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a cylinder sleeve. The cylinder sleeve comprises an outer-layer metal tube and an inner-layer wear-resistant layer, wherein the inner-layer wear-resistant layer is formed in a manner that the outer-layer metal tube, of which the internal wall is coated with wear-resistant material powder, is sintered under a protective atmosphere. The invention further discloses a manufacturing method of the cylinder sleeve. The method comprises the following steps of: coating the wear-resistant material powder on the internal wall of the outer-layer metal tube; and sintering the outer-layer metal tube, of which the internal wall is coated with the wear-resistant material powder, under the protective atmosphere, thereby forming the inner-layer wear-resistant layer. According to the cylinder sleeve and the manufacturing method of the cylinder sleeve, the inner-layer wear-resistant layer is manufactured by adopting a sintering process, so that the manufacturing process is simple.
Description
Technical field
The present invention relates to technical field of petroleum extraction, particularly a kind of cylinder sleeve and manufacture method thereof.
Background technique
Cylinder sleeve is as in the petroleum production, and the core component of slurry pump is used for bearing mud wearing and tearing, corrosion, and the length in its working life directly affects oil recovery efficiency.
The domestic cylinder sleeve that generally adopts at present has two kinds: bi-metal liner and ceramic cylinder jacket.The structure of these two kinds of cylinder sleeves all forms by outer layer metal tube with by the internal layer wear-resistant pipe that high-abrasive material is made, and it then is bi-metal liner that the internal layer wear-resistant pipe adopts abrasion resistance alloy to make, and it then is ceramic cylinder jacket that the internal layer wear-resistant pipe adopts wear-resistant ceramic to make.
Existing method for manufacturing cylinder jacket is outer layer metal tube and the respectively machine shaping of internal layer wear-resistant pipe, and then join by hot charging the internal layer wear-resistant pipe is nested in the outer layer metal tube, make outer layer metal tube and internal layer wear-resistant pipe form interference fit, be processed as the cylinder sleeve product according to actual demand more at last.
Existing cylinder sleeve product, the material wear-resisting property of internal layer wear-resistant pipe is limited.
Wherein, in the process that outer layer metal tube and internal layer wear-resistant pipe are processed respectively, and hot charging joins in the process, need to be through machining repeatedly, and carry out repeatedly heating, and manufacturing process is complicated, and energy consumption is large, and cost is high.
In addition, in the hot charging timing, stop the wear-resistant material layer gross distortion or crack, the thickness of wear-resistant material layer need to reach more than 4 millimeters, yet cylinder sleeve is in use because the wearing and tearing of piston, mud, gap between inner surface of cylinder liner and the piston increases gradually, and mud begins seepage, after the inner surface of cylinder liner wearing and tearing reach 0.5 millimeter, slurry pump can seriously lose efficacy because of mud leakage, cause cylinder sleeve to be scrapped, this moment, the effective rate of utilization of high-abrasive material only had 20%, and waste is serious.
And existing cylinder sleeve product is because outer layer metal tube and internal layer wear-resistant pipe are to join formation by the interference fit hot charging, and in use inside and outside two-layer pipe also breaks away from easily, and the reliability of cylinder sleeve product is reduced.
Summary of the invention
The invention provides a kind of cylinder sleeve and manufacture method thereof, manufacturing process is simple.
For reaching above-mentioned purpose, technological scheme of the present invention specifically is achieved in that
A kind of cylinder sleeve comprises outer layer metal tube layer and internal layer wearing layer, described internal layer wearing layer, and the outer layer metal tube that is coated with the high-abrasive material powder by inwall carries out sintering and forms under shielding gas atmosphere.
Preferably, described internal layer wearing layer with the weight percentage note, comprising: chromium 15 ~ 20%, silicon 5 ~ 10%, iron 30 ~ 35%, nickel 40 ~ 44%.
Preferably, described internal layer wearing layer with the weight percentage note, comprising: chromium 17%, silicon 8%, iron 35%, nickel 40%.
Preferably, described internal layer wearing layer thickness is 0.2 ~ 4 millimeter.
Preferably, described internal layer wearing layer thickness is 0.5 millimeter.
A kind of manufacture method of cylinder sleeve, the method comprises:
Apply the high-abrasive material powder at outer inner wall of metal tube;
The outer layer metal tube that inwall is coated with the high-abrasive material powder carries out sintering under shielding gas atmosphere, form the internal layer wearing layer.
Preferably, described internal layer wearing layer is remembered with weight percentage, comprising: chromium 15 ~ 20%, silicon 5 ~ 10%, iron 30 ~ 35%, nickel 40 ~ 44%.
Preferably, described internal layer wearing layer with the weight percentage note, comprising: chromium 17%, silicon 8%, iron 35%, nickel 40%.
Preferably, the described sintering that carries out under shielding gas atmosphere comprises:
Under hydrogen shield atmosphere, carry out sintering, 1000～1200 ℃ of sintering temperatures, sintering time is naturally cooling after 1 ~ 3 hour.
Preferably, the described sintering that carries out under shielding gas atmosphere comprises:
1100～1120 ℃ of sintering temperatures, sintering time be naturally cooling after 2 hours.
As seen from the above technical solution, this cylinder sleeve of the present invention and manufacture method thereof, the internal layer wearing layer is by sinter molding and be combined with outer layer metal tube, need not to carry out the step that repeatedly hot working and hot charging are joined, and manufacturing process is simple.
In addition, owing to adopt sintering process, the thickness of internal layer wearing layer can not be subject to the processing restriction that hot charging is joined process, need not to satisfy 4 millimeters thickness requirements, the thickness that can produce the internal layer wearing layer is less than 4 millimeters cylinder sleeve product, thereby reduced the high-abrasive material waste of internal layer wearing layer.
Have again, adopt sintering process, lattice links to each other between internal layer wearing layer and the outer layer metal tube, in conjunction with tight, the internal layer wearing layer that the interference fit that be difficult for to occur to form by the machining mode may cause come off or internal layer wearing layer and outer layer metal tube between the situation such as misplace, improved the reliability of cylinder sleeve.
At last, among the present invention, the internal layer wearing layer has adopted chromium 15 ~ 20%, silicon 5 ~ 10%, and iron 30 ~ 35%, the high-abrasive material of nickel 40 ~ 44% proportionings the experiment proved that, high-abrasive material compared to existing technology has higher hardness, has improved wear resistance.
Description of drawings
Fig. 1 is the cylinder sleeve structural representation of the embodiment of the invention.
Fig. 2 is the cylinder sleeve making method flow chart of the embodiment of the invention one.
Fig. 3 is the cylinder sleeve making method flow chart of the embodiment of the invention two.
Embodiment
For making purpose of the present invention, technological scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
As shown in Figure 1, the cylinder sleeve of the embodiment of the invention comprises:
Outer layer metal tube 1 and internal layer wearing layer 2, wherein, internal layer wearing layer 2 is to carry out sintering by the outer layer metal tube 1 that inwall is coated with the high-abrasive material powder under shielding gas atmosphere to form.Internal layer wearing layer 2 by sinter molding and with outer layer metal tube 1 combination, need not to carry out the step that repeatedly hot working and hot charging are joined, manufacturing process is very simple.
Wherein, the high-abrasive material of internal layer wearing layer 2 is any, can use existing any high-abrasive material, such as antifriction metal (AFM), wear-resistant ceramic etc.Outer layer metal tube also can use arbitrarily existing metal tube, and for example No. 45 forged steel adopt No. 45 forged steel can make the cylinder sleeve product reach a preferably balance between the usabilities such as Economy and compressive strength, fracture toughness.
In order to reach better wear-resisting effect, improve cylinder sleeve working life, as preferred embodiment, the internal layer wearing layer 2 with high-abrasive material is made with the weight percentage note, can comprise: chromium 15 ~ 20%, silicon 5 ~ 10%, iron 30 ~ 35%, nickel 40 ~ 44%.Wherein with chromium 17%, silicon 8%, iron 35%, nickel 40% adopt this component proportion for better, and the Rockwell hardness HRC of the internal layer wearing layer 2 of final formation is reached more than 68, and high hardness is brought better wear-resisting property.
By the internal layer wearing layer 2 that above-mentioned sintering method manufacturing forms, its thickness can accomplish below 4 millimeters, for example 0.2 ~ 4 millimeter, thus reducing when scrapping because of cylinder sleeve, high-abrasive material is polishing not, the waste to high-abrasive material that causes.Wherein, the thickness of internal layer wearing layer 2 take 0.5 millimeter as best because will scrap after 0.5 millimeter of the general wearing layer wearing and tearing, so the thickness of internal layer wearing layer 2 is when being 0.5 millimeter, the wearing layer waste is minimum.
The embodiment one of the manufacture method of above-mentioned cylinder sleeve comprises the steps: as shown in Figure 2
During concrete the coating, can adopt any existing coating method, for example the mode of use spraying can be more even, also the thickness of relatively good control spraying.High-abrasive material can be to have arbitrarily high-abrasive material now.
Concrete sintering process is any, can select suitable sintering temperature and sintering time according to the characteristic of high-abrasive material, guarantees to form a wearing layer structure at outer inner wall of metal tube sintering and gets final product.
In addition, the invention allows for the manufacture method embodiment two of cylinder sleeve, as shown in Figure 3, comprise the steps:
To remember with mass percent chromium: 15 ~ 20%; Silicon: 5 ~ 10%; Iron: 30 ~ 35%; Nickel: poured in the three-dimensional material mixer batch mixing after 40 ~ 44% raw material particle mixes into 1 hour, and obtained the high-abrasive material powder.Wherein, the raw material granularity is preferably 150 ~ 300 orders, and the raw material granularity too slightly can cause uneven components, can cause segregation, and granularity is not easy evenly mixed too carefully because of poor fluidity between the various different materials.
Above-mentioned mixed high-abrasive material powder evenly is sprayed on No. 45 forged steel inwalls 0.5 millimeter of coating thickness.
Because can wrapping 0.5 millimeter of wearing and tearing afterwards at the thickness of internal layer wearing layer, scraps cylinder sleeve, therefore coating thickness meeting above 0.5 millimeter causes the waste of high-abrasive material, is less than 0.5 millimeter and then can in shortening cylinder sleeve working life, cylinder sleeve is scrapped in advance, therefore, 0.5 millimeter is best.
Carry out sintering under hydrogen shield atmosphere, 1100～1120 ℃ of lower insulations of temperature 2 hours can be taken out blank when naturally cooling to 100 ℃ with stove.
Certainly, the temperature of sintering determines that according to different high-abrasive material proportionings for example 1000～1200 ℃, sintering time also can be determined for example 1 ~ 3 hour according to concrete high-abrasive material.The mode of cooling is any, and cooling, air-cooled water-cooled all can naturally.Sintering temperature is too high, overlong time, the crystal grain meeting chap of high-abrasive material; Cause wear resistance decrease, and sintering temperature is excessively low, the time is too short, and sintering is incomplete, crystal grain is too small, or fully crystallization, also can cause wear resistance decrease, through repeatedly experiment, 1100～1120 ℃ of lower insulations of sintering temperature 2 hours, the internal layer wearing layer hardness that obtains is higher, and wear-resisting property is good.
In addition, shielding gas atmosphere can also adopt other any reducibility gas, adopts hydrogen as shielding gas atmosphere, and cost is low, and cost performance is higher, and hydrogen also is easy to preparation, and raw material sources are extensive.
Blank is processed into the cylinder sleeve product according to drawing requirement.
Through experiment, by the cylinder sleeve that the embodiment of the invention is made, the life-span reached more than 3000 hours after using, and the cylinder sleeve product below 100 hours do not occur, and reliability and life-span are all above the cylinder sleeve product of domestic present use.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a cylinder sleeve comprises outer layer metal tube and internal layer wearing layer, it is characterized in that, and described internal layer wearing layer, the outer layer metal tube that is coated with the high-abrasive material powder by inwall carries out sintering and forms under shielding gas atmosphere.
2. cylinder sleeve as claimed in claim 1 is characterized in that, described internal layer wearing layer with the weight percentage note, comprising: chromium 15 ~ 20%, silicon 5 ~ 10%, iron 30 ~ 35%, nickel 40 ~ 44%.
3. cylinder sleeve as claimed in claim 2 is characterized in that, described internal layer wearing layer with the weight percentage note, comprising: chromium 17%, silicon 8%, iron 35%, nickel 40%.
4. such as each described cylinder sleeve in the claim 1 ~ 3, it is characterized in that described internal layer wearing layer thickness is 0.2 ~ 4 millimeter.
5. cylinder sleeve as claimed in claim 4 is characterized in that, described internal layer wearing layer thickness is 0.5 millimeter.
6. the manufacture method of a cylinder sleeve is characterized in that, the method comprises:
Apply the high-abrasive material powder at outer inner wall of metal tube;
The outer layer metal tube that inwall is coated with the high-abrasive material powder carries out sintering under shielding gas atmosphere, form the internal layer wearing layer.
7. manufacture method as claimed in claim 6 is characterized in that, described internal layer wearing layer is remembered with weight percentage, comprising: chromium 15 ~ 20%, silicon 5 ~ 10%, iron 30 ~ 35%, nickel 40 ~ 44%.
8. manufacture method as claimed in claim 7 is characterized in that, described internal layer wearing layer with the weight percentage note, comprising: chromium 17%, silicon 8%, iron 35%, nickel 40%.
9. manufacture method as claimed in claim 6 is characterized in that, the described sintering that carries out under shielding gas atmosphere comprises:
Under hydrogen shield atmosphere, carry out sintering, 1000～1200 ℃ of sintering temperatures, sintering time is naturally cooling after 1 ~ 3 hour.
10. manufacture method as claimed in claim 6 is characterized in that, the described sintering that carries out under shielding gas atmosphere comprises:
1100～1120 ℃ of sintering temperatures, sintering time be naturally cooling after 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210365933.1A CN102900663B (en) | 2012-09-27 | 2012-09-27 | Cylinder sleeve and manufacture method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210365933.1A CN102900663B (en) | 2012-09-27 | 2012-09-27 | Cylinder sleeve and manufacture method thereof |
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| Publication Number | Publication Date |
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| CN102900663A true CN102900663A (en) | 2013-01-30 |
| CN102900663B CN102900663B (en) | 2015-08-19 |
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| CN201210365933.1A Expired - Fee Related CN102900663B (en) | 2012-09-27 | 2012-09-27 | Cylinder sleeve and manufacture method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105463447A (en) * | 2015-12-17 | 2016-04-06 | 苏州市博创合金料筒科技有限公司 | Double-alloy integral sleeve and manufacturing method thereof |
| CN113614370A (en) * | 2019-03-22 | 2021-11-05 | 株式会社常光 | Plunger pump manufacturing method and plunger pump |
| CN114856848A (en) * | 2022-05-13 | 2022-08-05 | 咸阳职业技术学院 | Surface-strengthened high-temperature wear-resistant cylinder sleeve and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1225152A (en) * | 1996-12-05 | 1999-08-04 | 曼B与W狄赛尔公司 | A cylinder element, such as a cylinder liner, A piston, a piston skirt or a piston ring, in an internal combustion engine of the diesel type,and a piston ring for such an engine |
| CN2334885Y (en) * | 1997-05-19 | 1999-08-25 | 山东矿业学院 | Plasma beam hardened cylinder sleeve for internal combustion engine |
| CN1404945A (en) * | 2002-11-07 | 2003-03-26 | 复旦大学 | Method for preparing three-component composite steel pipe |
| CN101100719A (en) * | 2007-07-28 | 2008-01-09 | 中国石油化工集团公司 | Cermet composition and method for preparing cermet coat on metal surface |
| CN102320842A (en) * | 2011-06-15 | 2012-01-18 | 新兴铸管股份有限公司 | Method for preparing ceramic coating for replacing refractory coating prepared with centrifugal cast-steel pipe thermal mold method |
-
2012
- 2012-09-27 CN CN201210365933.1A patent/CN102900663B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1225152A (en) * | 1996-12-05 | 1999-08-04 | 曼B与W狄赛尔公司 | A cylinder element, such as a cylinder liner, A piston, a piston skirt or a piston ring, in an internal combustion engine of the diesel type,and a piston ring for such an engine |
| CN2334885Y (en) * | 1997-05-19 | 1999-08-25 | 山东矿业学院 | Plasma beam hardened cylinder sleeve for internal combustion engine |
| CN1404945A (en) * | 2002-11-07 | 2003-03-26 | 复旦大学 | Method for preparing three-component composite steel pipe |
| CN101100719A (en) * | 2007-07-28 | 2008-01-09 | 中国石油化工集团公司 | Cermet composition and method for preparing cermet coat on metal surface |
| CN102320842A (en) * | 2011-06-15 | 2012-01-18 | 新兴铸管股份有限公司 | Method for preparing ceramic coating for replacing refractory coating prepared with centrifugal cast-steel pipe thermal mold method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105463447A (en) * | 2015-12-17 | 2016-04-06 | 苏州市博创合金料筒科技有限公司 | Double-alloy integral sleeve and manufacturing method thereof |
| CN113614370A (en) * | 2019-03-22 | 2021-11-05 | 株式会社常光 | Plunger pump manufacturing method and plunger pump |
| CN113614370B (en) * | 2019-03-22 | 2023-11-28 | 株式会社常光 | Method for manufacturing plunger pump and plunger pump |
| CN114856848A (en) * | 2022-05-13 | 2022-08-05 | 咸阳职业技术学院 | Surface-strengthened high-temperature wear-resistant cylinder sleeve and preparation method thereof |
| CN114856848B (en) * | 2022-05-13 | 2024-01-26 | 咸阳职业技术学院 | Surface-reinforced high-temperature wear-resistant cylinder sleeve and preparation method thereof |
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| CN102900663B (en) | 2015-08-19 |
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Address after: 610000 Sichuan, Longquanyi economic and Technological Development Zone, No. 18 middle star road, building No. 1, building 5, building Patentee after: SICHUAN ZHONGWU ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Address before: 610000 Sichuan, Longquanyi economic and Technological Development Zone, No. 18 middle star road, building No. 1, building 5, building Patentee before: SICHUAN ZHONGWU ENVIRONMENTAL PROTECTION NEW MATERIAL CO.,LTD. |
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Effective date of registration: 20200509 Address after: 618007 Xingfu Road, Jinshan Industrial Park, Luojiang County, Deyang City, Sichuan Province Patentee after: Sichuan ZHONGJIU Lihe Petroleum Technology Co.,Ltd. Address before: 5, building 1, building 18, No. 610000, Xingguang Road, Longquanyi economic and Technological Development Zone, Chengdu, Sichuan Patentee before: SICHUAN ZHONGWU ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20150819 |