CN104454757A - Hydraulic cylinder and cylinder cover structure thereof - Google Patents
Hydraulic cylinder and cylinder cover structure thereof Download PDFInfo
- Publication number
- CN104454757A CN104454757A CN201410634566.XA CN201410634566A CN104454757A CN 104454757 A CN104454757 A CN 104454757A CN 201410634566 A CN201410634566 A CN 201410634566A CN 104454757 A CN104454757 A CN 104454757A
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- ring
- guide sleeve
- cylinder
- hydraulic cylinder
- cover structure
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention provides a hydraulic cylinder and a cylinder cover structure of the hydraulic cylinder. The cylinder cover structure of the hydraulic cylinder comprises a cylinder barrel, a guide sleeve, a positioning ring and a gland. The guide sleeve is sleeved with the cylinder barrel and is provided with a piston rod guide hole. The positioning ring is arranged on the outer circumferential wall of the guide sleeve and located outside the cylinder barrel. The gland comprises an end cover part and a sleeve part connected with the end cover part. The guide sleeve is sleeved with the end cover part, and the end cover part is positioned on the outer side of the positioning ring. Inner threads are arranged on the inner circumferential wall of the sleeve part, outer threads are arranged on the outer circumferential wall of the cylinder barrel, and the inner threads and the outer threads are in screw joint. The cylinder cover structure of the hydraulic cylinder has the advantages of being simple in structure and easy to process and assemble. Furthermore, in the assembling process, a static sealing ring cannot be damaged, and the sealing performance is improved.
Description
Technical field
The present invention relates to oil cylinder technical field, more specifically, relate to a kind of oil hydraulic cylinder and cylinder cover structure thereof.
Background technique
Oil hydraulic cylinder is hydraulic actuator hydraulic energy being changed into mechanical energy (straight reciprocating motion or oscillating motion), and it has the advantage that structure is simple, reliable operation, cost are low, is thus used widely in the hydraulic system of various machinery.
Oil hydraulic cylinder mainly comprises the component such as cylinder barrel, piston and piston rod, and wherein piston is slidably mounted in the inner chamber of cylinder barrel, and piston rod one end is connected with piston, and the other end stretches out from one end of cylinder barrel.The cylinder cover structure of oil hydraulic cylinder is commonly referred to as cylinder barrel passes one end closed structure for piston rod, and it plays the rod chamber of sealing cylinder barrel and the effect to piston rod guiding.
The seal ring that traditional cylinder cover structure comprises cylinder barrel, guide sleeve and is arranged on guide sleeve, guide sleeve is provided with outside thread, the inner circle wall of cylinder barrel is provided with internal thread, the outside thread of guide sleeve is directly threaded with the internal thread of cylinder barrel, and the piston rod pilot hole of piston rod in the middle part of guide sleeve passes.Although the required component of this kind of cylinder cover structure are few, can save manufacturing procedure and installation procedure, there are the following problems:
1) very high to the requirement on machining accuracy of the piston rod pilot hole of cylinder barrel internal thread and guide sleeve, to ensure that the coaxality of cylinder barrel internal thread and piston rod pilot hole meets the requirements, cause that the manufacture cost of oil hydraulic cylinder is high, manufacturing efficiency is low.If the coaxality of the piston rod pilot hole of cylinder barrel internal thread and guide sleeve can not reach requirement, easily generation " suppressing strength " phenomenon or piston rod coating are pulled.
2) guide sleeve plays the O type circle of static seal effect, along with the screw-in process of guide sleeve also enters cylinder barrel with screw extrusion shape, may the problems such as torsional deflection be occurred, easily cause static sealing ring to damage.
Summary of the invention
The present invention aims to provide a kind of cylinder cover structure of oil hydraulic cylinder, at least one problem in can solving the problem.Present invention also offers a kind of oil hydraulic cylinder.
The cylinder cover structure of a kind of oil hydraulic cylinder provided by the invention, comprising: cylinder barrel, guide sleeve, positioning ring and gland; Guide sleeve is set in cylinder barrel, and has piston rod pilot hole; Positioning ring is arranged on the periphery wall of guide sleeve, and is positioned at the outside of cylinder barrel; The sleeve part that gland comprises end cap portions and is connected with end cap portions; End cap portions is sleeved on guide sleeve, and is positioned at the outside of positioning ring; The inner circle wall of sleeve part is provided with internal thread, the periphery wall of cylinder barrel is provided with outside thread, internal thread and external thread bolt connection.
Further, screw or the bolt of radial setting is connected with between sleeve part and cylinder barrel.
Further, radial clearance is formed with between sleeve part and positioning ring.
Further, the inner circle wall of guide sleeve is set with guide ring.
Further, one end of guide ring is spacing by limited step, and the other end is by the retainer ring spacing be arranged on the inner circle wall of guide sleeve.
Further, guide ring is copper ring or phenolic plastic ring.
Further, the inner circle wall of guide sleeve offers the first o-ring groove and dust ring groove, the first seal ring is installed in the first o-ring groove, in dust ring groove, dust ring is installed; The periphery wall of guide sleeve offers the second o-ring groove, be provided with the second seal ring in the second o-ring groove, the second seal ring is distributed in the both sides of positioning ring.
Further, positioning ring and guide sleeve one-body molded.
Further, the periphery wall of guide sleeve offers annular groove, and positioning ring is connected in annular groove.
Present invention also offers a kind of oil hydraulic cylinder, be provided with the cylinder cover structure of above-mentioned oil hydraulic cylinder.
The cylinder cover structure of oil hydraulic cylinder provided by the invention, during assembling, guide sleeve can directly be pressed in the endoporus of cylinder barrel without the need to rotating, and pass through positioning ring, the cooperation of gland and cylinder barrel realizes the location of guide sleeve axis, relative to the mode that guide sleeve in prior art and cylinder barrel are directly spirally connected, because of in the whole length range of the corresponding guide sleeve of endoporus of cylinder barrel all without the need to offering internal thread, therefore inner hole of cylinder and the coaxality both piston rod pilot hole are easy to ensure, can suitably reduce the requirement of machining accuracy, be conducive to the manufacture cost reducing oil hydraulic cylinder, enhance productivity.In addition, adopt this kind of cylinder cover structure, the static sealing ring be arranged on guide sleeve can be slipped in cylinder barrel swimmingly along with guide sleeve, the torsion of static sealing ring can not be caused to damage.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the sectional structure of the oil hydraulic cylinder that the embodiment of the present invention provides;
Fig. 2 shows the partial enlargement structure of Fig. 1.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Fig. 1 shows the structure of the oil hydraulic cylinder that the embodiment of the present invention provides, and this oil hydraulic cylinder applies the cylinder cover structure (hereinafter referred to as cylinder cover structure) of the oil hydraulic cylinder having the embodiment of the present invention to provide.As shown in Figure 1, the cylinder cover structure that the embodiment of the present invention provides at least comprises: cylinder barrel 1, guide sleeve 2, positioning ring 3 and gland 4.
Wherein, guide sleeve 2 is set in cylinder barrel 1, and the center of guide sleeve 2 offers piston rod pilot hole 20, and piston rod 8 is by passing cylinder barrel 1 from piston rod pilot hole 20, and guide sleeve 2 mainly play the guiding role to piston rod 8.Positioning ring 3 is arranged on the periphery wall of guide sleeve 2, and is positioned at the outside of cylinder barrel 1.Positioning ring 3 is preferably one-body molded with guide sleeve 2 in the present embodiment.The sleeve part 42 that gland 4 comprises end cap portions 41 and is connected with end cap portions 41, as can be seen from Figure, end cap portions 41 is sleeved on guide sleeve 2, and is positioned at the outside (deviating from the side of cylinder barrel 1) of positioning ring 3, and end cap portions 41 and cylinder barrel 1 are placed in the both sides of positioning ring 3.The inner circle wall of sleeve part 42 is provided with internal thread, the periphery wall of cylinder barrel 1 is provided with outside thread, internal thread and external thread bolt connection.Be appreciated that sleeve part 42 by with being spirally connected of cylinder barrel 1, between end positioning ring 3 being clamped in end cap portions 41 and cylinder barrel 1, realize the axially locating to guide sleeve 2.Known in conjunction with prior art, guide sleeve 2 is provided with corresponding seal ring, for realizing the seal isolation of oil hydraulic cylinder rod chamber and external environment.
The cylinder cover structure that the embodiment of the present invention provides, during assembling, guide sleeve 2 can directly be pressed in the endoporus of cylinder barrel 1 without the need to rotating, the inner side end of positioning ring 3 and the end face of cylinder barrel 1 are fitted locate, then gland 4 is screwed on cylinder barrel 1, the inner side end of end cap portions 41 and the end face outside of positioning ring 3 are fitted locate, realized the location of guide sleeve 2 axis by the cooperation of positioning ring 3, gland 4 and cylinder barrel 1.Relative to the mode that guide sleeve in prior art and cylinder barrel are directly spirally connected, because all without the need to offering internal thread in the whole length range of the corresponding guide sleeve 2 of the endoporus of cylinder barrel 1, so cylinder barrel 1 endoporus and the coaxality both piston rod pilot hole 20 are easy to ensure and the stable connection of the two is reliable, can suitably reduce the requirement of machining accuracy, be conducive to the manufacture cost reducing oil hydraulic cylinder, enhance productivity.In addition, adopt this kind of cylinder cover structure, make the static sealing ring be arranged on guide sleeve 2 can slip in cylinder barrel 1 swimmingly along with guide sleeve 2, the torsion of static sealing ring can not be caused to damage.And the cylinder cover structure that the embodiment of the present invention provides has the advantage that structure is simple, be easy to processing, easily assembling, again because causing the damage of static sealing ring during assembling, can improve sealability.
Preferably, the radial screw 5 that arranges or bolt is connected with between sleeve part 42 and cylinder barrel 1, to avoid gland 4 loosening with being threaded of cylinder barrel 1.
In conjunction with reference to figure 2, preferably, radial clearance 30 is formed between sleeve part 42 and positioning ring 3, like this, when guide sleeve 2 is stressed, the existence of radial clearance 30 makes piston rod 8 can finely tune according to runnability automatic floating, can relieving hydraulic cylinder unbalance loading situation to a certain extent, improve oil hydraulic cylinder steering capability and runnability, and the working life of oil hydraulic cylinder can be extended.
Preferably; the inner circle wall (hole wall of corresponding piston rod pilot hole 20) of guide sleeve 2 is set with guide ring 6; guide ring 6 for copper ring or can be made up of other suitable materials (such as phenolic plastic); be slidably matched with piston rod 8, be not damaged in the process of reciprocal telescopic for the protection of piston rod 8.Preferably, one end of guide ring 6 is spacing by the limited step on guide sleeve 2 inner circle wall, and the other end is spacing by the back-up ring 61 be arranged on guide sleeve 2 inner circle wall.
Preferably, the inner circle wall of guide sleeve 2 offers the first o-ring groove and dust ring groove, be provided with the first seal ring 71, be provided with dust ring 73 in dust ring groove in the first o-ring groove, the first seal ring 71 is also called radial direction seal ring.First seal ring 71 and dust ring 73 all compress with piston rod 8 and contact, and play respectively to prevent fluid from leaking, avoid dust to enter effect in rod chamber.The periphery wall of guide sleeve 2 offers the second o-ring groove, second seal ring 72 is installed in second o-ring groove, second seal ring 72 is also static sealing ring, the both sides compressing with cylinder barrel 1 being distributed in positioning ring 3 contact, second seal ring 72 can not to be distorted damage with the process that guide sleeve 2 is assembled in cylinder barrel 1, can ensure good sealability.
In addition, although positioning ring 3 is one-body molded with guide sleeve 2 in the present embodiment, but in other embodiments, positioning ring 3 can be split-type structural with guide sleeve 2, such as on the periphery wall of guide sleeve 2, offer annular groove, positioning ring 3 is connected in annular groove, can reduce consumptive material and the amount of finish of guide sleeve 2 like this, cost-saving.
The embodiment of the present invention additionally provides a kind of oil hydraulic cylinder, is provided with the cylinder cover structure of above-mentioned oil hydraulic cylinder.The cylinder cover structure provided because of the embodiment of the present invention can reach above-mentioned technique effect, and the oil hydraulic cylinder being provided with this cylinder cover structure also should possess corresponding technique effect, does not repeat them here.
These are only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a cylinder cover structure for oil hydraulic cylinder, is characterized in that, comprising:
Cylinder barrel (1), guide sleeve (2), positioning ring (3) and gland (4);
Described guide sleeve (2) is set in described cylinder barrel (1), and has piston rod pilot hole (20);
Described positioning ring (3) is arranged on the periphery wall of guide sleeve (2), and is positioned at the outside of described cylinder barrel (1);
The sleeve part (42) that described gland (4) comprises end cap portions (41) and is connected with described end cap portions (41); Described end cap portions (41) is sleeved on described guide sleeve (2), and is positioned at the outside of described positioning ring (3); The inner circle wall of described sleeve part (42) is provided with internal thread, the periphery wall of described cylinder barrel (1) is provided with outside thread, described internal thread and described external thread bolt connection.
2. the cylinder cover structure of oil hydraulic cylinder according to claim 1, is characterized in that, is connected with the radial screw (5) that arranges or bolt between described sleeve part (42) and described cylinder barrel (1).
3. the cylinder cover structure of oil hydraulic cylinder according to claim 2, is characterized in that, is formed with radial clearance (30) between described sleeve part (42) and described positioning ring (3).
4. the cylinder cover structure of oil hydraulic cylinder according to claim 2, is characterized in that, the inner circle wall of described guide sleeve (2) is set with guide ring (6).
5. the cylinder cover structure of oil hydraulic cylinder according to claim 4, it is characterized in that, one end of described guide ring (6) is spacing by limited step, and the other end is spacing by the back-up ring be arranged on the inner circle wall of described guide sleeve (2) (61).
6. the cylinder cover structure of oil hydraulic cylinder according to claim 4, is characterized in that, described guide ring (6) is copper ring or phenolic plastic ring.
7. the cylinder cover structure of oil hydraulic cylinder according to claim 1, it is characterized in that, the inner circle wall of described guide sleeve (2) offers the first o-ring groove and dust ring groove, first seal ring (71) is installed in described first o-ring groove, dust ring (73) is installed in described dust ring groove; The periphery wall of described guide sleeve (2) offers the second o-ring groove, be provided with the second seal ring (72) in described second o-ring groove, described second seal ring (72) is distributed in the both sides of described positioning ring (3).
8. the cylinder cover structure of oil hydraulic cylinder according to any one of claim 1 to 7, is characterized in that, described positioning ring (3) is one-body molded with described guide sleeve (2).
9. the cylinder cover structure of oil hydraulic cylinder according to any one of claim 1 to 7, is characterized in that, the periphery wall of described guide sleeve (2) offers annular groove, and described positioning ring (3) is connected in described annular groove.
10. an oil hydraulic cylinder, is characterized in that, is provided with the cylinder cover structure of the oil hydraulic cylinder according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634566.XA CN104454757B (en) | 2014-11-12 | 2014-11-12 | hydraulic cylinder and its cylinder cover structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634566.XA CN104454757B (en) | 2014-11-12 | 2014-11-12 | hydraulic cylinder and its cylinder cover structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104454757A true CN104454757A (en) | 2015-03-25 |
| CN104454757B CN104454757B (en) | 2017-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410634566.XA Active CN104454757B (en) | 2014-11-12 | 2014-11-12 | hydraulic cylinder and its cylinder cover structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104454757B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041765A (en) * | 2015-07-07 | 2015-11-11 | 武汉科技大学 | Hydraulic cylinder with stepped lip edge guide sleeve |
| CN105090161A (en) * | 2015-08-11 | 2015-11-25 | 徐州重型机械有限公司 | Anti-abrasion oil-air cylinder and engineering machine |
| CN105090160A (en) * | 2015-09-30 | 2015-11-25 | 柳州双吉机械有限公司 | Double-acting piston type hydraulic cylinder |
| CN106438573A (en) * | 2016-06-30 | 2017-02-22 | 泸州长信液压机械制造有限公司 | Taper sleeve type mechanical locking oil cylinder |
| CN107697253A (en) * | 2017-08-29 | 2018-02-16 | 北京精密机电控制设备研究所 | A kind of outboard immersion jack |
| CN108087379A (en) * | 2017-12-20 | 2018-05-29 | 大大科技(宁国)有限公司 | Novel hydraulic oil cylinder top cover and oil cylinder connection structure |
| CN108286541A (en) * | 2018-02-26 | 2018-07-17 | 中钢集团西安重机有限公司 | A kind of cylinder piston rod V groups sealing structure unit and its installation method |
| WO2021068899A1 (en) * | 2019-10-10 | 2021-04-15 | 常州中车铁马科技实业有限公司 | End cover assembly, air cylinder, tread sweeper and railway vehicle |
| CN112758050A (en) * | 2019-11-04 | 2021-05-07 | 常州中车铁马科技实业有限公司 | End cover assembly, pneumatic driving device, wheel tread cleaning device and railway vehicle |
| CN113357220A (en) * | 2021-06-01 | 2021-09-07 | 内蒙古北方重工业集团有限公司 | Core rod oil cylinder of vertical extruder and piston rod protection device thereof |
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| US3955479A (en) * | 1974-06-10 | 1976-05-11 | Caterpillar Tractor Co. | Fluid pressure operated actuator with safe disassembly means |
| CN101949398A (en) * | 2010-09-13 | 2011-01-19 | 三一重工股份有限公司 | Single-action hydraulic oil cylinder and paver with same |
| CN202322123U (en) * | 2011-10-20 | 2012-07-11 | 徐州重型机械有限公司 | Hoist and vertical oil cylinder thereof |
| CN202708063U (en) * | 2012-02-15 | 2013-01-30 | 三一重工股份有限公司 | Inner snap ring type hydraulic cylinder sealing structure, hydraulic cylinder and concrete pump truck |
| CN102996570A (en) * | 2012-11-28 | 2013-03-27 | 三一重工股份有限公司 | Single-action double-graded hydraulic cylinder and engineering machine |
| CN203009440U (en) * | 2012-11-28 | 2013-06-19 | 三一重工股份有限公司 | Single-action two-stage hydraulic cylinder and engineering machine |
| CN203098451U (en) * | 2012-12-10 | 2013-07-31 | 平湖市青云建材机械有限公司 | Threading oil cylinder for hydraulic bale packing machine |
| CN203570744U (en) * | 2013-11-15 | 2014-04-30 | 山东同力液压装备有限公司 | One-way buffer hydraulic oil cylinder for special vehicle |
-
2014
- 2014-11-12 CN CN201410634566.XA patent/CN104454757B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3955479A (en) * | 1974-06-10 | 1976-05-11 | Caterpillar Tractor Co. | Fluid pressure operated actuator with safe disassembly means |
| CN101949398A (en) * | 2010-09-13 | 2011-01-19 | 三一重工股份有限公司 | Single-action hydraulic oil cylinder and paver with same |
| CN202322123U (en) * | 2011-10-20 | 2012-07-11 | 徐州重型机械有限公司 | Hoist and vertical oil cylinder thereof |
| CN202708063U (en) * | 2012-02-15 | 2013-01-30 | 三一重工股份有限公司 | Inner snap ring type hydraulic cylinder sealing structure, hydraulic cylinder and concrete pump truck |
| CN102996570A (en) * | 2012-11-28 | 2013-03-27 | 三一重工股份有限公司 | Single-action double-graded hydraulic cylinder and engineering machine |
| CN203009440U (en) * | 2012-11-28 | 2013-06-19 | 三一重工股份有限公司 | Single-action two-stage hydraulic cylinder and engineering machine |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041765A (en) * | 2015-07-07 | 2015-11-11 | 武汉科技大学 | Hydraulic cylinder with stepped lip edge guide sleeve |
| CN105090161A (en) * | 2015-08-11 | 2015-11-25 | 徐州重型机械有限公司 | Anti-abrasion oil-air cylinder and engineering machine |
| CN105090160A (en) * | 2015-09-30 | 2015-11-25 | 柳州双吉机械有限公司 | Double-acting piston type hydraulic cylinder |
| CN106438573B (en) * | 2016-06-30 | 2018-11-20 | 泸州长信液压机械制造有限公司 | taper sleeve type mechanical locking oil cylinder |
| CN106438573A (en) * | 2016-06-30 | 2017-02-22 | 泸州长信液压机械制造有限公司 | Taper sleeve type mechanical locking oil cylinder |
| CN107697253A (en) * | 2017-08-29 | 2018-02-16 | 北京精密机电控制设备研究所 | A kind of outboard immersion jack |
| CN108087379A (en) * | 2017-12-20 | 2018-05-29 | 大大科技(宁国)有限公司 | Novel hydraulic oil cylinder top cover and oil cylinder connection structure |
| CN108286541A (en) * | 2018-02-26 | 2018-07-17 | 中钢集团西安重机有限公司 | A kind of cylinder piston rod V groups sealing structure unit and its installation method |
| WO2021068899A1 (en) * | 2019-10-10 | 2021-04-15 | 常州中车铁马科技实业有限公司 | End cover assembly, air cylinder, tread sweeper and railway vehicle |
| US12454251B2 (en) * | 2019-10-10 | 2025-10-28 | Crrc Changzhou Tech-Mark Industrial Co., Ltd. | End cover assembly, air cylinder, tread cleaner and railway vehicle |
| CN112758050A (en) * | 2019-11-04 | 2021-05-07 | 常州中车铁马科技实业有限公司 | End cover assembly, pneumatic driving device, wheel tread cleaning device and railway vehicle |
| CN112758050B (en) * | 2019-11-04 | 2025-10-10 | 常州中车铁马科技实业有限公司 | End cover assembly, pneumatic drive device, wheel tread cleaning device and rail vehicle |
| CN113357220A (en) * | 2021-06-01 | 2021-09-07 | 内蒙古北方重工业集团有限公司 | Core rod oil cylinder of vertical extruder and piston rod protection device thereof |
| CN113357220B (en) * | 2021-06-01 | 2023-07-14 | 内蒙古北方重工业集团有限公司 | Vertical extrusion mandrel cylinder and its piston rod protection device |
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| Publication number | Publication date |
|---|---|
| CN104454757B (en) | 2017-10-13 |
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Inventor after: Li Dong Inventor after: Fang Zhongxi Inventor after: Jiang Renkun Inventor after: Yang Chaofei Inventor after: Du Qi Inventor after: Ding Yu Inventor after: Han Xiangdong Inventor after: Jiang Weiwei Inventor before: Ding Yu Inventor before: Han Xiangdong Inventor before: Jiang Weiwei |
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Effective date of registration: 20190916 Address after: 110027, No. 25, development road, Shenyang economic and Technological Development Zone, Liaoning Co-patentee after: China Shenhua Energy Co Shendong coal Co. Patentee after: Sany Heavy Equipment Co.,Ltd. Address before: Yansai Lake Street 110027 economic and Technological Development Zone Liaoning city Shenyang province No. 31 Patentee before: Sany Heavy Equipment Co.,Ltd. |
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