CN106122152A - Ultra high pressure control valve - Google Patents
Ultra high pressure control valve Download PDFInfo
- Publication number
- CN106122152A CN106122152A CN201610780511.9A CN201610780511A CN106122152A CN 106122152 A CN106122152 A CN 106122152A CN 201610780511 A CN201610780511 A CN 201610780511A CN 106122152 A CN106122152 A CN 106122152A
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- Prior art keywords
- guide
- pressure
- spool
- endoporus
- valve
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The present invention relates to a kind of ultra high pressure control valve, belong to hydraulic control system technical field, including main valve body, the endoporus of main valve body is provided with main valve housing, the endoporus of main valve housing is provided with the main valve plug that can slide, main valve housing one end is provided with transition end cap, transition end cap endoporus uses the mode slipped into pressure is installed and amplify spool, the lower surface that spool is amplified with pressure in main valve plug upper surface contacts, pressure amplifies the effective active area of spool upper end more than the effective active area at main valve plug oil-in, transitioning end lid is arranged above cover plate, it is provided with main spring between the groove top of cover plate and pressure amplification spool upper surface, cover plate is arranged above the pressure pilot valve with decompression.The present invention can obtain bigger by governor pressure by the relatively low pressure that controls, and control pressure and easily realize, and additionally can realize the Stress control of big flow Superhigh Pressure Hydraulic System, reduce the complexity of control system, improve safety.
Description
Technical field
The invention belongs to hydraulic control system technical field, be specifically related to a kind of ultra high pressure control valve.
Background technology
At present, applying substantial amounts of hydraulic pressure adjusting control valve in hydraulic mechanical equipment, in these valves, some is Direct Action Type
Structure, it is adaptable to the hydraulic system that flow is less；Some is pilot-operated type structure, it is adaptable to the hydraulic system that flow is bigger.Currently
The hydraulic pressure regulation valve of these forms is due to the reasons in structure of self, it is impossible to control the pressure of Superhigh Pressure Hydraulic System, less
The pressure of big flow Superhigh Pressure Hydraulic System can be controlled, but in present hydraulic mechanical equipment and Hydraulic Power Transmission System thereof, by
In working ability and the demand of processing technique, to big flow Superhigh Pressure Hydraulic System and the demand of big flow ultrahigh-pressure hydraulic element
Also getting more and more, the requirement to its performance is more and more higher.
Summary of the invention
It is an object of the invention to provide a kind of ultra high pressure control valve, it is possible to regulation easily and safely controls big flow and surpasses
The pressure of high pressure (hydraulic system pressure is at more than 50Mpa) hydraulic system.
Ultra high pressure control valve of the present invention, including main valve body, is provided with main valve housing in the endoporus of main valve body, main valve housing
Being provided with the main valve plug that can slide in endoporus, the sealing surface of main valve plug is in close contact with the sealing strip of main valve housing, is formed and seals
Line or sealing surface, be equipped with sealing ring between main valve plug and endoporus and between main valve housing and main valve body endoporus, main valve housing one end sets
Being equipped with transition end cap, use the mode slipped into be provided with pressure and amplify spool in transition end cap endoporus, the upper end of main valve plug is stretched into
In the endoporus of transition end cap, the lower surface that spool is amplified with pressure in main valve plug upper surface contacts, and pressure amplifies spool upper end
Effective active area is more than the effective active area at main valve plug oil-in, and transitioning end lid is arranged above cover plate, sets in cover plate
Being equipped with groove, pressure amplifies the upper end of spool and extend in groove, amplifies at groove top and pressure and sets between spool upper surface
Being equipped with main spring, the top of cover plate is provided with the oilhole within communication groove, is provided with phase in cover plate, transition end cap and main valve body
The oil circuit control answered, cover plate is arranged above the pressure pilot valve with decompression, and oilhole connects pressure first with oil circuit control
Pilot valve.
Described main valve plug stretches into and is provided with cannelure on the periphery of transition end cap one end, is provided with bolster in cannelure,
The action that main valve plug opens and closes can be played the effect of buffering, and the opening and closing making main valve plug are steady.
Described pressure pilot valve includes guide valve blocks, pilot valve, guide's valve pocket and guide's spring spool, and guide valve blocks is pacified
Being contained in the upper end of cover plate, guide's valve pocket uses the mode slided to load in the endoporus of guide valve blocks, and pilot valve uses slip
Mode loads in the endoporus of guide's valve pocket, and guide valve blocks one end is provided with guide's spring spool, the other end is provided with spool and adjusts
Device, is provided with pressure regulation device in the endoporus of guide's spring spool, guide valve blocks endoporus passes through pilot control oil communication
Guide's spring spool endoporus and the endoporus of spool adjusting apparatus, guide valve blocks is provided with oilhole A and the hydraulic fluid port connecting its endoporus
B, oilhole A are connected with the oilhole on cover plate, and hydraulic fluid port B connects oil circuit control.Use the pressure pilot valve 10 of decompression, this control
Pressure easily realizes, owing to using pilot control principle, such that it is able to realize the Stress control of big flow Superhigh Pressure Hydraulic System.
Described spool adjusting apparatus includes that spool adjusts end cap, and spool adjusts end cover bolt and is fixedly connected on guide valve blocks
One end, spool adjusts screw rod and is contained in the screwed hole that spool adjusts end cap, and locking nut is contained in spool and adjusts on screw rod.
Described pressure regulation device includes guide's spring, guide's spring base and guide's valve seat, guide's spring base and pilot valve
Seat is contained in the two ends of guide's spring spool endoporus, and the two ends of guide's spring closely connect with guide's spring base and guide's valve seat respectively
Touching, pressure adjusts blind nut and is contained in the other end of guide's spring spool, and pressure adjusts screw rod and is contained in the endoporus that pressure adjusts blind nut.
It is provided with main spring seat so that main spring is more steady between groove end face in described main spring and cover plate.
The inner hole sleeve of described transition end cap is on the face of cylinder of main valve housing one end, and the endoporus of transition end cap is round with main valve housing
It is provided with sealing member between cylinder, prevents hydraulic fluid leak.
It is provided with sealing member between periphery and the endoporus of transition end cap of described pressure amplification spool, prevents hydraulic oil from letting out
Leakage.
Described bolster includes that the side of buffer substrate tablet, buffer spring, buffer bar and pad, buffer substrate tablet and pad all has can
Snapping in the rectangular channel of cannelure, buffer spring is arranged in the shoulder hole of buffer substrate tablet, and buffer bar is enclosed within the interior of spring, buffer bar
The lower surface of larger diameter end pressed against spring, and pad is pressed on the upper surface of the larger diameter end of buffer bar, when main valve plug is opened,
Pad and buffer substrate tablet by the active force of fluid, utilize the buffering of buffer spring to make the opening and closing of primary spools steady.
Compared with prior art, it is an advantage of the current invention that:
Can obtain bigger by governor pressure, owing to using the pressure guide of decompression by the relatively low pressure that controls
Valve, this control pressure easily realizes, owing to using pilot control principle, such that it is able to realize big flow Superhigh Pressure Hydraulic System
Stress control, reduces the complexity of control system, reduces fault rate, improve safety.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of the present invention；
Fig. 2 is the enlarged diagram at H；
In figure: 1, main valve body, 2, main valve housing, 3, main valve plug, 4, bolster, 4.1, pad, 4.2, buffer bar, 4.3, buffering
Spring, 4.4, shoulder hole, 4.5, buffer substrate tablet, 5, pressure amplify spool, 6, main spring, 7, main spring seat, 8, transition end cap, 9, lid
Plate, 10, pressure pilot valve, 11, oil circuit control, 12, spool adjust screw rod, 13, spool adjust end cap, 14, locking nut, 15,
Pilot valve, 16, guide valve blocks, 17, guide's valve pocket, 18, pressure adjust screw rod, 19, pressure adjust blind nut, 20, guide's spring,
21, guide's spring base, 22, guide's valve seat, 23, guide's spring spool, 24, pilot control oil circuit.
Detailed description of the invention
Below against accompanying drawing, by the description to optimum embodiment, the detailed description of the invention of the present invention is made the most in detail
Thin explanation.
Ultra high pressure control valve as shown in Figure 1, including main valve body 1, is provided with main valve housing 2 in the endoporus of main valve body 1,
Being provided with the main valve plug 3 that can slide in the endoporus of main valve housing 2, the sealing surface of main valve plug 3 closely connects with the sealing strip of main valve housing 2
Touch, form seal line or sealing surface, between main valve plug 3 and endoporus and between main valve housing 2 and main valve body 1 endoporus, be equipped with sealing
Circle, main valve housing 2 one end is provided with transition end cap 8, uses the mode slipped into be provided with pressure and amplify spool in transition end cap 8 endoporus
5, the upper end of main valve plug 3 extend in the endoporus of transition end cap 8, and the lower surface that spool 5 is amplified with pressure in main valve plug 3 upper surface connects
Touching, pressure amplifies the effective active area of spool 5 upper end more than the effective active area at main valve plug 3 oil-in, transition end cap 8
Being arranged above cover plate 9, be provided with groove in cover plate 9, pressure amplifies the upper end of spool 5 and extend in groove, at groove top
And it being provided with main spring 6 between pressure amplification spool 5 upper surface, the top of cover plate 9 is provided with the oilhole within communication groove, lid
Being provided with corresponding oil circuit control 11 in plate 9, transition end cap 8 and main valve body 1, cover plate 9 is arranged above having decompression
Pressure pilot valve 10, oilhole connects pressure pilot valve 10 with oil circuit control 11.
Main valve plug 3 stretches into and is provided with cannelure on the periphery of transition end cap 8 one end, is provided with bolster 4 in cannelure, can
Play the effect of buffering with the action opening and closing main valve plug 3, the opening and closing making main valve plug 3 are steady.
Pressure pilot valve 10 includes guide valve blocks 16, pilot valve 15, guide's valve pocket 17 and guide's spring spool 23, guide
Valve body 16 is arranged on the upper end of cover plate 9, and guide's valve pocket 17 uses the mode slided to load in the endoporus of guide valve blocks 16, pilot valve
Core 15 uses the mode slided to load in the endoporus of guide's valve pocket 17, guide valve blocks 16 one end be provided with guide's spring spool 23,
The other end is provided with spool adjusting apparatus, is provided with pressure regulation device, guide valve blocks 16 in the endoporus of guide's spring spool 23
Endoporus connects guide's spring spool 23 endoporus and the endoporus of spool adjusting apparatus, on guide valve blocks 16 by pilot control oil circuit 24
Being provided with the oilhole A and hydraulic fluid port B connecting its endoporus, oilhole A is connected with the oilhole on cover plate 9, and hydraulic fluid port B connects oil circuit control 11,
Using the pressure pilot valve 10 of decompression, this control pressure easily realizes, owing to using pilot control principle, such that it is able to real
The Stress control of the biggest flow Superhigh Pressure Hydraulic System.
Spool adjusting apparatus includes that spool adjusts end cap 13, and spool adjusts end cap 13 and is fixedly connected on guide valve blocks with bolt
One end of 16, spool adjusts screw rod 12 and is contained in the screwed hole that spool adjusts end cap 13, and locking nut 14 is contained in spool and adjusts spiral shell
On bar 12.
Pressure regulation device includes guide's spring 20, guide's spring base 21 and guide's valve seat 22, guide's spring base 21 and elder generation
Guide valve seat 22 is contained in the two ends of guide's spring spool 23 endoporus, the two ends of guide's spring 20 respectively with guide's spring base 21 and guide
Valve seat 22 is in close contact, and pressure adjusts blind nut 19 and is contained in the other end of guide's spring spool 23, and pressure adjusts screw rod 18 and is contained in pressure
Power adjusts in the endoporus of blind nut 19.
It is provided with main spring seat 7 so that main spring 6 is more steady between groove end face in main spring 6 and cover plate 9.
The inner hole sleeve of transition end cap 8 is on the face of cylinder of main valve housing 2 one end, and the endoporus of transition end cap 8 is round with main valve housing 2
It is provided with sealing member between cylinder, prevents hydraulic fluid leak.
It is provided with sealing member between periphery and the endoporus of transition end cap 8 of pressure amplification spool 5, prevents hydraulic fluid leak.
As in figure 2 it is shown, bolster 4 includes buffer substrate tablet 4.5, buffer spring 4.3, buffer bar 4.2 and pad 4.1, buffer substrate tablet
4.5 and the side of pad 4.1 all have the rectangular channel that can snap in cannelure, buffer spring 4.3 is arranged on the ladder of buffer substrate tablet 4.5
In hole 4.4, buffer bar 4.2 is enclosed within buffer spring 4.3, and the lower surface of the larger diameter end of buffer bar 4.2 pressed against buffer spring
4.3, pad 4.1 is pressed on the upper surface of the larger diameter end of buffer bar 4.2.When main valve plug 3 is opened, pad 4.1 and buffer substrate tablet
4.5 by the active force of fluid, utilizes the buffering of buffer spring 4.3 to make the opening and closing of primary spools 3 steady.
The work process of ultra high pressure valve scheme of the present invention is as follows: each parts in novel ultrahigh pressure pressure valve scheme
After having assembled, pilot control oil enters the oil suction chamber of pressure pilot valve 10, master through oil circuit control 11 and pilot control oil circuit 24
Spool 3 controls chamber and pilot valve 15 controls chamber, and the pressure of pilot control oil acts on the front end of pilot valve 15 and passes through simultaneously
The hydraulic fluid port B of pressure pilot valve 10 acts on pressure and amplifies the upper surface of spool 5, and the pressure of regulation pressure pilot valve 10 adjusts screw rod
18, when making the regulation power of pressure pilot valve 10 reach a certain setting value, the hydraulic coupling that this regulation power can be generated by is referred to as regulating pressure
Power, when the pressure of pilot control oil is less than regulation pressure, pilot valve 15 is failure to actuate, and main valve plug 3 lifts, and leaves sealing surface,
Main valve open, the pressure of controlled system is in minimal pressure force value, and regulation spool adjusts screw rod 12 can regulate this minimum pressure
Size；When the pressure of pilot control oil meets and exceeds regulation pressure, pilot valve 15 action so that main valve plug 3 controls chamber
Pressure stability, in regulation force value, now amplifies the area oil-in area more than main valve plug 3 of spool 5 due to pressure, so
Only when the pressure of controlled hydraulic system increases to certain value, main valve plug 3 just can be made to lift, main valve open, make controlled system
The pressure stability of system is in current value, simultaneously because be provided with bolster 4 in main valve plug 3, and can be to 3 dozens of on an off of main valve plug
The effect of buffering is played in the action closed, and the opening and closing making main valve plug 3 are steady.According to this operation principle, can be by relatively low
The pressure that controls obtain bigger by governor pressure, owing to using the pressure pilot valve 10 of decompression, this control pressure is easy
Realize, owing to using pilot control principle, such that it is able to realize the Stress control of big flow Superhigh Pressure Hydraulic System.
In sum, the present invention can obtain bigger by governor pressure by the relatively low pressure that controls, and subtracts owing to using
The pressure pilot valve of pressure function, this control pressure easily realizes, owing to using pilot control principle, such that it is able to realize big flow
The Stress control of Superhigh Pressure Hydraulic System, reduces the complexity of control system, reduces fault rate, improve safety.
The above is to be exemplarily described the present invention, it is clear that the present invention implements and do not limited by aforesaid way
System, whether does any change in its shape or structure, as long as the method design that have employed the present invention is entered with technical scheme
The improvement of various unsubstantialities of row, or the most improved design by the present invention and technical scheme directly apply to other occasion
, all within protection scope of the present invention.
Claims (9)
1. a ultra high pressure control valve, including main valve body (1), is provided with main valve housing (2) in the endoporus of main valve body (1), main
The endoporus of valve pocket (2) is provided with the sealing strip of the main valve plug (3) that can slide, the sealing surface of main valve plug (3) and main valve housing (2)
It is in close contact, forms seal line or sealing surface, between main valve plug (3) and endoporus and between main valve housing (2) and main valve body (1) endoporus
It is equipped with sealing ring, it is characterised in that main valve housing (2) one end is provided with transition end cap (8), transition end cap (8) endoporus uses sliding
The mode entered is provided with pressure and amplifies spool (5), and the upper end of main valve plug (3) extend in the endoporus of transition end cap (8), main valve plug
(3) lower surface that spool (5) is amplified with pressure in upper surface contacts, and pressure amplifies the effective active area of spool (5) upper end and is more than
Effective active area at main valve plug (3) oil-in, transition end cap (8) is arranged above cover plate (9), and cover plate is provided with in (9)
Groove, pressure amplifies the upper end of spool (5) and extend in groove, amplifies between spool (5) upper surface at groove top and pressure
Being provided with main spring (6), the top of cover plate (9) is provided with the oilhole within communication groove, cover plate (9), transition end cap (8) and master
Being provided with corresponding oil circuit control (11) in valve body (1), cover plate (9) is arranged above the pressure pilot valve with decompression
(10), oilhole connects pressure pilot valve (10) with oil circuit control (11).
Ultra high pressure control valve the most according to claim 1, it is characterised in that described main valve plug (3) stretches into transition end cap
(8) it is provided with cannelure on the periphery of one end, in cannelure, is provided with bolster (4).
Ultra high pressure control valve the most according to claim 1, it is characterised in that described pressure pilot valve (10) includes elder generation
Pilot valve body (16), pilot valve (15), guide's valve pocket (17) and guide's spring spool (23), guide valve blocks (16) is arranged on cover plate
(9) upper end, guide's valve pocket (17) uses the mode slided to load in the endoporus of guide valve blocks (16), and pilot valve (15) uses
The mode slided loads in the endoporus of guide's valve pocket (17), and guide valve blocks (16) one end is provided with guide's spring spool (23), another
One end is provided with spool adjusting apparatus, is provided with pressure regulation device, guide valve blocks in the endoporus of guide's spring spool (23)
(16) endoporus is by pilot control oil circuit (24) connection guide's spring spool (23) endoporus and the endoporus of spool adjusting apparatus, guide
Being provided with the oilhole A and hydraulic fluid port B connecting its endoporus on valve body (16), oilhole A is connected with the oilhole on cover plate (9), and hydraulic fluid port B connects
Oil circuit control (11).
Ultra high pressure control valve the most according to claim 3, it is characterised in that described spool adjusting apparatus includes spool
Adjusting end cap (13), spool adjusts end cap (13) and is fixedly connected on one end of guide valve blocks (16) with bolt, and spool adjusts screw rod
(12) being contained in the screwed hole that spool adjusts end cap (13), locking nut (14) is contained in spool and adjusts on screw rod (12).
Ultra high pressure control valve the most according to claim 3, it is characterised in that described pressure regulation device includes guide
Spring (20), guide's spring base (21) and guide's valve seat (22), guide's spring base (21) and guide's valve seat (22) are contained in first guided missile
The two ends of spring sleeve (23) endoporus, the two ends of guide's spring (20) are tight with guide's spring base (21) and guide's valve seat (22) respectively
Contact, pressure adjusts blind nut (19) and is contained in the other end of guide's spring spool (23), and pressure adjusts screw rod (18) and is contained in pressure tune
In the endoporus of whole blind nut (19).
Ultra high pressure control valve the most according to claim 1, it is characterised in that described main spring (6) is interior with cover plate (9)
Groove end face between be provided with main spring seat (7).
Ultra high pressure control valve the most according to claim 1, it is characterised in that the inner hole sleeve of described transition end cap (8) exists
On the face of cylinder of main valve housing (2) one end, and it is provided with sealing member between the endoporus of transition end cap (8) and main valve housing (2) face of cylinder.
Ultra high pressure control valve the most according to claim 1, it is characterised in that described pressure amplifies the periphery of spool (5)
And it is provided with sealing member between the endoporus of transition end cap (8).
Ultra high pressure control valve the most according to claim 2, it is characterised in that described bolster (4) includes buffer substrate tablet
(4.5), buffer spring (4.3), buffer bar (4.2) and pad (4.1), the side of buffer substrate tablet (4.5) and pad (4.1) all has
Can snap in the rectangular channel of cannelure, buffer spring (4.3) is arranged in the shoulder hole (4.4) of buffer substrate tablet (4.5), buffer bar
(4.2) being enclosed within buffer spring (4.3), the lower surface of the larger diameter end of buffer bar (4.2) pressed against buffer spring (4.3), pad
Sheet (4.1) is pressed on the upper surface of the larger diameter end of buffer bar (4.2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610780511.9A CN106122152B (en) | 2016-08-31 | 2016-08-31 | Ultra high pressure control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610780511.9A CN106122152B (en) | 2016-08-31 | 2016-08-31 | Ultra high pressure control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106122152A true CN106122152A (en) | 2016-11-16 |
| CN106122152B CN106122152B (en) | 2017-11-21 |
Family
ID=57273418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610780511.9A Active CN106122152B (en) | 2016-08-31 | 2016-08-31 | Ultra high pressure control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106122152B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594225A (en) * | 2019-09-26 | 2019-12-20 | 山东泰丰智能控制股份有限公司 | Multistage drive hydraulic valve control structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3977438A (en) * | 1975-10-02 | 1976-08-31 | Willis Oil Tool Co. | Means to reset an actuator pilot valve |
| DE2929338A1 (en) * | 1979-07-20 | 1981-02-05 | Wessel Hydraulik | Hydraulic motor control valve - includes body of same dia. as spring-supported guide plunger |
| CN103090070A (en) * | 2011-11-02 | 2013-05-08 | 广西柳工机械股份有限公司 | Piloted type pressure reducing valve |
| CN103115187A (en) * | 2013-01-28 | 2013-05-22 | 南京理工大学 | High-flow high-pressure pneumatic switch valve |
| CN205918680U (en) * | 2016-08-31 | 2017-02-01 | 山东泰丰液压股份有限公司 | Superhigh pressure pressure control valve |
-
2016
- 2016-08-31 CN CN201610780511.9A patent/CN106122152B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3977438A (en) * | 1975-10-02 | 1976-08-31 | Willis Oil Tool Co. | Means to reset an actuator pilot valve |
| DE2929338A1 (en) * | 1979-07-20 | 1981-02-05 | Wessel Hydraulik | Hydraulic motor control valve - includes body of same dia. as spring-supported guide plunger |
| CN103090070A (en) * | 2011-11-02 | 2013-05-08 | 广西柳工机械股份有限公司 | Piloted type pressure reducing valve |
| CN103115187A (en) * | 2013-01-28 | 2013-05-22 | 南京理工大学 | High-flow high-pressure pneumatic switch valve |
| CN205918680U (en) * | 2016-08-31 | 2017-02-01 | 山东泰丰液压股份有限公司 | Superhigh pressure pressure control valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594225A (en) * | 2019-09-26 | 2019-12-20 | 山东泰丰智能控制股份有限公司 | Multistage drive hydraulic valve control structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106122152B (en) | 2017-11-21 |
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Address after: 272001 Shandong city of Jining province high tech Zone Haichuan Road No. 66 Patentee after: Shandong Taifeng intelligent control Limited by Share Ltd Address before: 272001 Shandong city of Jining province high tech Zone Haichuan Road No. 66 Patentee before: Shandong Taifeng Hydraulic Co., Ltd. |