CN107420371A - The method for preventing automatic moving when hydraulic cylinder piston rod works - Google Patents
The method for preventing automatic moving when hydraulic cylinder piston rod works Download PDFInfo
- Publication number
- CN107420371A CN107420371A CN201710496958.8A CN201710496958A CN107420371A CN 107420371 A CN107420371 A CN 107420371A CN 201710496958 A CN201710496958 A CN 201710496958A CN 107420371 A CN107420371 A CN 107420371A
- Authority
- CN
- China
- Prior art keywords
- piston rod
- cylinder
- locking
- automatic moving
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- 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
- F15B15/1457—Piston rods
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention discloses the method for automatic moving when preventing that hydraulic cylinder piston rod from working, comprise the following steps：Delivery hydraulic pressure oil at towards the oil inlet of cylinder bottom, hydraulic oil enters in rodless cavity, increase the pressure in rodless cavity, and piston rod and piston is driven to be moved together in cylinder barrel towards cylinder cap, when the locking slot on sleeve is moved to locking bearing pin when on same set of straight line, connecting element is by locking pin shaft compression in locking slot, and locking bearing pin is by piston rod locking.The present invention can it is simple in construction, manufacturing cost is low, using the matching relationship for locking bearing pin and locking slot, piston rod locking prevents from being acted on lower automatic moving by external force when piston rod from working.
Description
Technical field
The present invention relates to a kind of hydraulic cylinder, and in particular to the method for preventing automatic moving when hydraulic cylinder piston rod works.
Background technology
Engineering machinery is the general name of the construction machinery for engineering construction.It is widely used in building, water conservancy, electric power, road, ore deposit
The engineering fields such as mountain, harbour and national defence, species is various, and engineering machinery is the important component of Chinese equipment manufacturing industry.Briefly
Say, the synthesis needed for all restoration in earth-rock construction engineering, pavement construction and maintenance, the operation of flow-type lift and various architectural engineerings
Property mechanized equipment necessary to mechanized construction engineering, referred to as engineering machinery.It is mainly used in national defense construction engineering, communications and transportation
Build, the construction of the raw and semifinished materials industries such as energy industry construction and production, mine and production, agriculture, forestry, water conservancy construction, industrial built with civilian
Build, urban construction, the field such as environmental protection.It is substantially similar to the appellation of this industry in countries in the world, the wherein U.S. and Britain
Referred to as building machinery and equipment, Germany are referred to as building machinery and device, and Russia is referred to as building and road building machine, Japan are referred to as building
It is if mechanical.Construction implement is also referred to as in our national portioned products, and the sector certification is set up according to State Council in mechanical system
When be referred to as engineering machinery, continue up till now.Various countries are roughly the same to the sector delimitation product scope, China Construction Machinery
Railway project machinery, fork truck and industrial transportation vehicle, finishing machinery, elevator, pneumatic is relatively also add with other various countries
The industries such as instrument.
Lift in engineering machinery also with relatively broad, be easy to the goods handling on ground to operation height by lift
Degree, piston rod when then needing in lift are maintained at certain height, when certain altitude is arrived in hydraulic jack lifting, enter
Row self-locking, and self-locking high efficient and reliable is must assure that, to prevent there is security incident.But existing hydraulic cylinder self locking mode uses mostly
Hydraulic control one-way valve machine loop, makes hydraulic cylinder be maintained at certain position.Due to the limitation of technical merit, in hydraulic valve core or hydraulic cylinder
The situation of leakage often occurs, causes hydraulic locking cylinder not thorough, locking effect is poor, knot of some mechanical self-locking to hydraulic cylinder
Configuration formula is improved, and causes hydraulic cylinder finished product structure complicated, production cost also significantly raises.
The content of the invention
The technical problems to be solved by the invention are that self-locking is realized in the hydraulic control one-way valve machine loop that prior art uses, but
It is the situation that leakage often occurs in hydraulic valve core or hydraulic cylinder, causes hydraulic locking cylinder not thorough, locking effect is poor, purpose
It is to provide the method for preventing automatic moving when hydraulic cylinder piston rod works, solves problem described above.
The present invention is achieved through the following technical solutions：
The method for preventing automatic moving when hydraulic cylinder piston rod works, comprises the following steps：Towards at the oil inlet of cylinder bottom
Delivery hydraulic pressure oil, hydraulic oil enter in rodless cavity, increase the pressure in rodless cavity, and drive piston rod and piston together in cylinder
Moved in cylinder towards cylinder cap, when the locking slot on sleeve is moved to locking bearing pin when on same set of straight line, connecting element will
Locking pin shaft compression is in locking slot, and locking bearing pin is by piston rod locking.
Further, the piston is respectively positioned in cylinder barrel with piston rod, and on the piston rod, cylinder cap is close by piston rod for piston bush
It is enclosed in cylinder barrel, cylinder bottom welds with cylinder barrel, forms rodless cavity and rod chamber between piston and cylinder bottom and cylinder cap respectively.
Further, the kink jacket casing is on the outer wall of piston rod, and sleeve can turn around the axis of piston rod
Dynamic, locking slot is located on sleeve, and the inwall of cylinder barrel is provided with the second groove, and connecting element and locking bearing pin are respectively positioned on the second groove
Interior, connecting element one end is connected with the second groove, the other end and locking pin axis connection, and lock bearing pin can be along connection member
The axis direction movement of part.
Further, support column and the first sealing ring are additionally provided with the piston, support column is located in rodless cavity, and first is close
Seal is enclosed between piston and cylinder barrel.
Further, the first groove matched with support column is additionally provided with the cylinder bottom, cushioning element is provided with the first groove
Part, the axis of buffer element and the axis of support column are on same straight line.
Further, oil inlet is additionally provided with the cylinder bottom, and carries out mouth and is connected with the first groove.
Further, inflow pipeline is additionally provided with the sleeve, inflow pipeline connects rod chamber with locking slot.
Further, swing handle is additionally provided with the sleeve, and swing handle is on the outside of cylinder cap.
Further, the second sealing ring and dust ring are additionally provided between the cylinder cap and sleeve, the second sealing ring and dust-proof
Circle is enclosed on sleeve, and is fixed in cylinder cap.
The present invention compared with prior art, has the following advantages and advantages：
The present invention prevents the method for automatic moving when hydraulic cylinder piston rod works, it is necessary to during self-locking, when piston rod stretches out
During to certain position, locking bearing pin will be pressed in locking slot by flexible connecting element, realize self-locking purpose；When need
When unlocking, the delivery hydraulic pressure oil into rod chamber, hydraulic oil flows through inflow pipeline and goes out locking slot by bearing pin is locked；Rotary sleeve simultaneously
Cylinder piston rod can not then carry out self-locking, meet different use demands；Buffer unit is additionally provided between cylinder bottom and piston, can be reduced
Piston extends the service life of hydraulic cylinder to the impulsive force of cylinder bottom.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention.
Mark and corresponding parts title in accompanying drawing：
1- cylinder bottoms, 2- buffer gears, 3- pistons, 4- cylinder barrels, 5- locking slots, 6- sleeves, 7- locking bearing pins, 8- cylinder caps, 9-
Swing handle, 10- oil inlets, 11- support columns, the sealing rings of 12- first, 13- inflow pipelines, 14- oil return openings, 15- connecting elements,
16- pistons, 17- dust rings, the sealing rings of 18- second.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment
As shown in figure 1, the method that the present invention prevents automatic moving when hydraulic cylinder piston rod works, including step once：
Delivery hydraulic pressure oil, hydraulic oil are entered in rodless cavity at towards the oil inlet 10 on cylinder bottom 1, increase the pressure in rodless cavity, and compel
Piston 3 is set to be moved together with piston rod 16 towards the direction of cylinder cap 8, and sleeve 6 will move together with piston rod 16, work as sleeve
Locking slot 5 on 6 is moved to locking bearing pin 7 when on same vertical direction, and connecting element 15 squeezes into lock by bearing pin 7 is locked
In tight groove 5, locking bearing pin 7 locks piston rod 16, and under external force, piston rod 16 will be unable to automatic moving；Towards oil return opening
Delivery hydraulic pressure oil at 14, hydraulic oil enter in rod chamber, increase the pressure of rod chamber, and the hydraulic oil in rodless cavity is from inflow pipeline
13 are entered in locking slot 5, and locking bearing pin 7 is squeezed out into locking slot 5, realizes the unblock to piston rod.
Wherein, the cylinder bottom 1 welds together with the one end of cylinder barrel 4, increases the intensity of junction, and cylinder bottom 1 is provided with oil-feed
Mouth 10, piston 3 is enclosed on the end of piston rod 16, and piston rod 16 is respectively positioned in cylinder barrel 4 with piston 3, piston 3 and cylinder barrel 4
Between be provided with the first sealing ring 12, the first sealing ring 12 is O-ring seal, and the first sealing ring 12 is enclosed on piston 3, the first sealing ring
12 effect is the clearance leakage for preventing hydraulic oil between cylinder barrel 4 and piston 3, and the region formed between piston 3 and cylinder bottom 1 is
Rodless cavity, the region formed between piston 3 and cylinder cap 8 are rod chamber, and the piston rod 16 is provided with sleeve 6, and sleeve 6 is enclosed on work
On the outer wall of stopper rod 16, and sleeve 6 can rotate around the axis of piston rod 16, when piston rod 16 stretches in cylinder barrel 4, set
Cylinder 6 will be moved and then piston rod 16 together, and the cylinder cap 8 is provided with the second sealing ring 18 and dust ring 17, and dust ring 17 is close
On the outside of cylinder cap 8, and the second sealing ring 18 and dust ring 17 are enclosed on sleeve 6, and the effect of dust ring 17 is to prevent the external world
Impurity entered by the gap between sleeve 6 and cylinder cap 8 in cylinder barrel 4, the second sealing ring 18 is also O-ring seal, effect
It is to prevent the hydraulic fluid leak in cylinder barrel 4；The sleeve 6 is provided with two locking slots 5, axle of two locking slots 5 on sleeve 6
Line is symmetrical, and two inflow pipelines 13 are additionally provided with sleeve 6, and the one end of inflow pipeline 13 connects with rod chamber, the other end with
Locking slot 5 is connected, and the hydraulic oil in rodless cavity will be entered in locking slot 5 along inflow pipeline 13, on the inwall of the cylinder barrel 4
Provided with two the second grooves, two the second grooves are symmetrical on sleeve 4, and connecting element 15 and locking bearing pin are provided with the second groove
7, connecting element 15 is spring, has certain elasticity, and the one end of connecting element 15 is connected in the second groove, the other end and locking
Bearing pin 7 connects, and locking bearing pin 7 matches with locking slot 5, i.e., when locking slot 5 is moved to locking bearing pin 7 in same plane, even
Locking bearing pin 7 will be squeezed into locking slot 5 by connecing element 15, and locking bearing pin 7 locks sleeve 6, and piston rod 16 will be unable to move；
Oil return opening 14 is additionally provided with the cylinder barrel 4, oil return opening 14 connects with rod chamber, towards oil return opening 14 at be passed through hydraulic oil, hydraulic oil
Enter in rod chamber, increase the pressure in rod chamber, hydraulic oil will be entered in locking slot 5 along inflow pipeline 13, work as liquid
When force feed is more than elastic force of the connecting element 15 to locking bearing pin 7 to the pressure for locking bearing pin 7, locking bearing pin 7 will be located in locking slot 5
Squeeze out, piston rod 16 can move along cylinder bottom 1, realize unblock；Swing handle 9 is additionally provided with the sleeve 6, and
Swing handle 9 is located at the outside of cylinder cap 8, pulls swing handle 9, sleeve 6 and then swing handle 9 will rotate together, therefore be not required to
When will be to 16 self-locking of piston rod, it is only necessary to pull swing handle 9, axial displacement occurs for sleeve 6 so that locking bearing pin 7 and locking
Groove 5 will be on no longer same straight line, and piston rod 16 is during movement, and locking bearing pin 7 will be unable to enter in locking slot 5, nothing
Method implements self-locking to piston rod 16, meets different use functions；Be additionally provided with the first groove on the cylinder bottom 1, oil inlet 10 with
First groove is connected, and buffer element 2 is provided with groove, and buffer element 2 is spring, is had certain elasticity, is gone back on the piston 3
Provided with support column 11, and support column 11 is in rodless cavity, and the axis of support column 11 is with the axis of buffer element 2 in same
On straight line, when piston rod 16 back moves together with piston 3, support column 11 can be entered in the first groove, and first is recessed
Buffer element 2 in groove will produce cushion effect to support column 11, reduce piston 3 to the impact of cylinder bottom 1, extend making for hydraulic cylinder
Use the life-span.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (9)
1. prevent the method for automatic moving when hydraulic cylinder piston rod works, it is characterised in that comprise the following steps：Towards cylinder bottom
(1) oil inlet (10) place delivery hydraulic pressure oil, hydraulic oil enter in rodless cavity, increase the pressure in rodless cavity, and drive work
Stopper rod (16) and piston (3) are mobile towards cylinder cap (8) in cylinder barrel (4) together, when the locking slot (5) on sleeve (6) is moved to
With locking bearing pin (7) when on same set of straight line, connecting element (15) will lock bearing pin (7) and be pressed on locking slot (5), locking pin
Axle (7) locks piston rod (16).
2. the method according to claim 1 for preventing automatic moving when hydraulic cylinder piston rod works, it is characterised in that：Institute
State piston (3) and piston rod (16) to be respectively positioned in cylinder barrel (4), piston (3) is enclosed on piston rod (16), and cylinder cap (8) is by piston rod
(16) it is sealed in cylinder barrel (4), cylinder bottom (1) is welded with cylinder barrel (4), and shape is distinguished between piston (3) and cylinder bottom (1) and cylinder cap (8)
Into rodless cavity and rod chamber.
3. the method according to claim 1 for preventing automatic moving when hydraulic cylinder piston rod works, it is characterised in that：Institute
State kink cylinder (6) to be enclosed on the outer wall of piston rod (16), and sleeve (6) can rotate around the axis of piston rod (16), lock
Tight groove (5) is located on sleeve (6), and the inwall of cylinder barrel (4) is provided with the second groove, and connecting element (15) and locking bearing pin (7) are equal
In the second groove, connecting element (15) one end is connected with the second groove, and the other end is connected with locking bearing pin (7), and is locked
Bearing pin (7) can move along the axis direction of connecting element (15).
4. the method according to claim 1 for preventing automatic moving when hydraulic cylinder piston rod works, it is characterised in that：Institute
State and support column (11) and the first sealing ring (12) are additionally provided with piston (3), support column (11) is located in rodless cavity, the first sealing ring
(12) it is enclosed between piston (3) and cylinder barrel (4).
5. the method according to claim 4 for preventing automatic moving when hydraulic cylinder piston rod works, it is characterised in that：Institute
The first groove for being additionally provided with cylinder bottom (1) and being matched with support column (11) is stated, buffer element (2), cushioning element are provided with the first groove
The axis of part (2) is with the axis of support column (11) on same straight line.
6. the method according to claim 5 for preventing automatic moving when hydraulic cylinder piston rod works, it is characterised in that：Institute
State and oil inlet (10) is additionally provided with cylinder bottom (1), and carry out mouth (10) and connected with the first groove.
7. the method according to claim 1 for preventing automatic moving when hydraulic cylinder piston rod works, it is characterised in that：Institute
State and inflow pipeline (13) is additionally provided with sleeve (6), inflow pipeline (13) connects rod chamber with locking slot (5).
8. the method according to claim 1 for preventing automatic moving when hydraulic cylinder piston rod works, it is characterised in that：Institute
State and swing handle (9) is additionally provided with sleeve (6), and swing handle (9) is located on the outside of cylinder cap (8).
9. the method according to claim 1 for preventing automatic moving when hydraulic cylinder piston rod works, it is characterised in that：Institute
State and the second sealing ring (18) and dust ring (17) are additionally provided between cylinder cap (8) and sleeve (6), the second sealing ring (18) and dust ring
(17) it is enclosed on sleeve (6), and is fixed in cylinder cap (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710496958.8A CN107420371B (en) | 2017-06-26 | 2017-06-26 | The method of automatic moving when preventing hydraulic cylinder piston rod from working |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710496958.8A CN107420371B (en) | 2017-06-26 | 2017-06-26 | The method of automatic moving when preventing hydraulic cylinder piston rod from working |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107420371A true CN107420371A (en) | 2017-12-01 |
| CN107420371B CN107420371B (en) | 2019-07-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710496958.8A Active CN107420371B (en) | 2017-06-26 | 2017-06-26 | The method of automatic moving when preventing hydraulic cylinder piston rod from working |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107420371B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864286A (en) * | 2021-09-30 | 2021-12-31 | 中船重工中南装备有限责任公司 | Self-locking device of sliding plate oil cylinder |
| CN114590382A (en) * | 2022-03-17 | 2022-06-07 | 中国船舶科学研究中心 | High-pressure water replacement device for assisting deep sea connection and disconnection and use method |
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|---|---|---|---|---|
| CN2826042Y (en) * | 2005-07-19 | 2006-10-11 | 西安重型机械研究所 | Mechanically locked hydraulic cylinder |
| CN201407243Y (en) * | 2009-05-27 | 2010-02-17 | 陕西燎原国际航空制造有限公司 | Oil cylinder mechanical self-locking device |
| CN203756646U (en) * | 2014-03-27 | 2014-08-06 | 湖南特达液压有限公司 | Oil cylinder buffer device |
| CN104454780A (en) * | 2014-10-23 | 2015-03-25 | 长沙中联重科环卫机械有限公司 | Oil cylinder with mechanical locking function and hydraulic system |
| CN204357821U (en) * | 2014-11-21 | 2015-05-27 | 安徽理工大学 | A kind of mechanical self-locking hydraulic cylinder |
| CN204403046U (en) * | 2015-01-23 | 2015-06-17 | 四川远鸣科技有限公司 | A kind of hydraulic press hydraulic cylinder self locking apparatus |
-
2017
- 2017-06-26 CN CN201710496958.8A patent/CN107420371B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2826042Y (en) * | 2005-07-19 | 2006-10-11 | 西安重型机械研究所 | Mechanically locked hydraulic cylinder |
| CN201407243Y (en) * | 2009-05-27 | 2010-02-17 | 陕西燎原国际航空制造有限公司 | Oil cylinder mechanical self-locking device |
| CN203756646U (en) * | 2014-03-27 | 2014-08-06 | 湖南特达液压有限公司 | Oil cylinder buffer device |
| CN104454780A (en) * | 2014-10-23 | 2015-03-25 | 长沙中联重科环卫机械有限公司 | Oil cylinder with mechanical locking function and hydraulic system |
| CN204357821U (en) * | 2014-11-21 | 2015-05-27 | 安徽理工大学 | A kind of mechanical self-locking hydraulic cylinder |
| CN204403046U (en) * | 2015-01-23 | 2015-06-17 | 四川远鸣科技有限公司 | A kind of hydraulic press hydraulic cylinder self locking apparatus |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864286A (en) * | 2021-09-30 | 2021-12-31 | 中船重工中南装备有限责任公司 | Self-locking device of sliding plate oil cylinder |
| CN113864286B (en) * | 2021-09-30 | 2024-02-06 | 中船重工中南装备有限责任公司 | Self-locking device of slide plate oil cylinder |
| CN114590382A (en) * | 2022-03-17 | 2022-06-07 | 中国船舶科学研究中心 | High-pressure water replacement device for assisting deep sea connection and disconnection and use method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107420371B (en) | 2019-07-16 |
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Effective date of registration: 20190925 Address after: 610000 China (Sichuan) Free Trade Pilot Zone Patentee after: SICHUAN XINGZHI ZHIHUI INTELLECTUAL PROPERTY OPERATION CO., LTD. Address before: 610000 Luzhou city of Sichuan province Liyang machinery and equipment Industrial Park Road No. ten Patentee before: Luzhou Changjiang oil cylinder manufacturing Co., Ltd. |
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Effective date of registration: 20191105 Address after: Two road 610000 Sichuan city of Chengdu province Wuhou District Zhida No. 556 1 floor Patentee after: Chengdu Yanxing Fruit Technology Co., Ltd. Address before: No. 1002, 10 / F, building 2, No. 88, jiaozi Avenue, high tech Zone, Chengdu, China (Sichuan) pilot Free Trade Zone Patentee before: SICHUAN XINGZHI ZHIHUI INTELLECTUAL PROPERTY OPERATION CO., LTD. |
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Effective date of registration: 20191115 Address after: No. 468, south section of Baoguang Avenue, Xindu town, Xindu District, Chengdu City, Sichuan Province Patentee after: Sichuan Ruigong heavy hydraulic parts factory Address before: Two road 610000 Sichuan city of Chengdu province Wuhou District Zhida No. 556 1 floor Patentee before: Chengdu Yanxing Fruit Technology Co., Ltd. |