CN104847732A - Valve-controlled cylinder system for unbalance load - Google Patents
Valve-controlled cylinder system for unbalance load Download PDFInfo
- Publication number
- CN104847732A CN104847732A CN201510115702.9A CN201510115702A CN104847732A CN 104847732 A CN104847732 A CN 104847732A CN 201510115702 A CN201510115702 A CN 201510115702A CN 104847732 A CN104847732 A CN 104847732A
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- CN
- China
- Prior art keywords
- piston rod
- servovalve
- displacement transducer
- cylinder barrel
- hydraulic control
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- 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.)
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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
- F15B15/1428—Cylinders
-
- 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
-
- 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
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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 discloses a valve-controlled cylinder system for an unbalance load, relates to the valve-controlled cylinder system suitable for the work condition that the unbalance load moves up and down, and belongs to the technical field of mechatronics. The valve-controlled cylinder system for the unbalance load comprises a cylinder barrel, a piston rod, a hydraulic-control opening A, a hydraulic-control opening B and a hydraulic-control opening C, and further comprises a displacement sensor sliding rod, a displacement sensor sleeve, a servo valve A and a servo valve B. According to the valve-controlled cylinder system for the unbalance load, a displacement sensor is installed in a three-cavity cylinder, the installation of the valve-controlled cylinder system is simplified, the displacement of a hydraulic cylinder can be conveniently measured, and therefore the higher control precision can be obtained; in addition, the servo valves replace energy accumulators to control a three-cavity cylinder balance load cavity so that the pressure of the balance cavity can be kept stable, the load is well balanced, the complexity of a control algorithm is simplified, and the control precision on the piston rod displacement can be improved.
Description
Technical field
The present invention relates to a kind of valve-controlled cylinder system, particularly relate to the valve-controlled cylinder system for unbalanced load, belong to electromechanical integration technology area.
Background technique
Oil hydraulic cylinder is a kind of typical straight line driving mechanism, is widely used in greatly in the industrial processs such as metallurgy, engineering machinery, hudraulic lift due to its power density ratio.Under some position control accuracy to oil hydraulic cylinder require higher occasion, the general servovalve of 3-position 4-way or two chambeies of Proportional valve to oil hydraulic cylinder of using control, to obtain higher control accuracy.Servo valve-controlled cylinder or Proportional Valve-controlled cylinder system need hydraulic energy source to drive its work.In some applications, the load of oil hydraulic cylinder has serious unbalance response, and namely in the process of stretching out and retract, the load of oil hydraulic cylinder exists very large difference.In this case, the position control accuracy of oil hydraulic cylinder can be caused also asymmetric, it stretches out and in the process of retracting, the position control accuracy of oil hydraulic cylinder is inconsistent.In order to solve the problem of asymmetric load, someone proposes employing three chamber cylinder as actuator, and as shown in Figure 1, the system that three chamber cylinders are used as actuator comprises accumulator, three chamber cylinders, servovalve, and wherein three chamber cylinders comprise cylinder barrel and piston rod.The difference of three chamber cylinders is that it has three control chambers, a load balance chamber has been had more than conventional oil hydraulic cylinder, by connecting an accumulator at load balance chamber place, for counter balance pocket provides certain pressure, thus make counter balance pocket produce a power all the time, be used for offsetting a part of unbalanced load.This three chamber cylinders have really played certain effect in solution unbalanced load, but itself also has certain problem.The first, transposition displacement sensor cannot be pacified in existing three its inside of chamber cylinder at present, and the displacement wanting to measure oil hydraulic cylinder can only by the mode of additional displacement transducer, and this makes the mounting design more complicated of valve-controlled cylinder system.Second, at present the counter balance pocket of existing three chamber cylinders by accumulator for it provides pressure, when the piston cylinder motion of three chamber cylinders, the volume of counter balance pocket changes thereupon, stretch out in process at oil cylinder, counter balance pocket volume becomes large gradually, fluid now in accumulator will discharge gradually and be filled in counter balance pocket, and along with the minimizing of accumulator inner fluid, its leather bag will expand, inflation pressure in leather bag will reduce gradually, and the pressure of counter balance pocket will be caused to reduce gradually, and the equilibrant that same counter balance pocket produces will reduce.Same when oil cylinder is in retraction process, the equilibrant that counter balance pocket produces will increase gradually.Can find out, adopt the mode of accumulator, the equilibrant of generation is change, and is uncontrollable.So it is poor to the counterbalance effect of unbalanced load.
Summary of the invention
The technical problem to be solved in the present invention is under the operating conditions of unbalanced load, realizes the load balancing three chamber cylinder piston rods better, and realizes the more high-precision control of piston rod displacement.A kind of valve-controlled cylinder system for unbalanced load disclosed by the invention, be applicable to unbalanced load operating conditions, can realize being diverted in three chamber cylinder interior peaces the sensor measuring oil hydraulic cylinder displacement, the displacement state of Real-Time Monitoring three chamber cylinder piston rod, in addition, the pressure remained steady of counter balance pocket can be made, improve the control accuracy to piston rod displacement.
The present invention is achieved by the following technical solutions:
A kind of valve-controlled cylinder system for unbalanced load of the present invention, comprise cylinder barrel, piston rod, hydraulic control mouth A, hydraulic control mouth B, hydraulic control mouth C, also comprise displacement transducer sliding bar, displacement transducer sleeve, servovalve A and servovalve B, the wherein central axes of displacement transducer sliding bar, displacement transducer sleeve, cylinder barrel, piston rod, displacement transducer sleeve, cylinder barrel, piston rod are hollow structure; Piston rod is nested within cylinder barrel, and can centrally axial sliding movement; Cylinder barrel lower end has the tapped hole for installation position displacement sensor sleeve, displacement transducer sleeve is connected threadably with between cylinder barrel and seals with seal ring, the front end of displacement transducer sleeve is inserted within cylinder barrel, rear end is positioned at the outside of cylinder barrel, and the rear end of displacement transducer sleeve is with controller; Piston rod upper end has the tapped hole of fixing displacement sensor sliding bar, and displacement transducer sliding bar is connected threadably with between piston rod and seals with seal ring; Displacement transducer sliding bar is placed within displacement transducer sleeve, and can centrally axial sliding movement; Liquid controling cavity A is formed between cylinder barrel and piston-rod lower end, fluid enters liquid controling cavity A by hydraulic control mouth A, form liquid controling cavity C between cylinder barrel and piston rod upper end, fluid enters liquid controling cavity C by hydraulic control mouth C, and the moving contact face seal ring between cylinder barrel and piston rod seals; Form liquid controling cavity B between displacement transducer sleeve and cylinder barrel, fluid enters liquid controling cavity B by hydraulic control mouth B, and the moving contact face seal ring between displacement transducer sleeve and cylinder barrel seals; The oil-feed port P of servovalve A is connected with high pressure oil, and oil return inlet T is connected with fuel tank, and restriction A blocks, and restriction B is connected with liquid controling cavity A5 by hydraulic control mouth A6; The oil-feed port P of servovalve B is connected with high pressure oil, and oil return inlet T is connected with fuel tank, and restriction A is connected with liquid controling cavity C by hydraulic control mouth C, and restriction B is connected with liquid controling cavity B by hydraulic control mouth B.
Described displacement transducer sliding bar is the rod-like structure with sensor function.
The working procedure of a kind of valve-controlled cylinder system for unbalanced load disclosed by the invention is:
When the dynamic load of piston rod band is stretched out, servovalve A leads directly to, and high pressure oil enters liquid controling cavity A through restriction B, the hydraulic control mouth A of servovalve A, in order to offset unbalanced load, by controlling the restriction aperture of servovalve, makes the pressure remained steady of counter balance pocket; Servovalve B leads directly to, high pressure oil enters liquid controling cavity B through restriction B, the hydraulic control mouth B of servovalve B, in order to overcome other load except unbalanced load, so that the dynamic load of piston rod band is stretched out, by controller and displacement transducer, can the displacement of Real-Time Monitoring piston rod, form the closed loop control to piston rod 4, described displacement transducer comprises displacement transducer sliding bar and displacement transducer sleeve.
When the dynamic load of piston rod band is retracted, servovalve A tiltedly leads to, fluid from liquid controling cavity A by the restriction B of hydraulic control mouth A, servovalve A, get back to fuel tank, offset unbalanced load by the throttling action of restriction B, by controlling the restriction aperture of servovalve, make the pressure remained steady of counter balance pocket; Servovalve B tiltedly leads to, high pressure oil enters liquid controling cavity C through restriction A, the hydraulic control mouth C of servovalve B, in order to overcome other load except unbalanced load, so that the dynamic load of piston rod band is retracted, by controller and displacement transducer, can the displacement of Real-Time Monitoring piston rod, form the closed loop control to piston rod 4.
Beneficial effect:
1, a kind of valve-controlled cylinder system for unbalanced load of the present invention, replace accumulator to control three cylinder balanced load chambeies, chamber with servovalve, the pressure of counter balance pocket can be made always to keep stable, better balanced load, simplify the complexity of control algorithm, and higher control accuracy can be obtained.
2, a kind of valve-controlled cylinder system for unbalanced load of the present invention is by three chamber cylinder interior peace transposition displacement sensors, simplifies the installation of valve-controlled cylinder system, and can be convenient for measuring the displacement of oil hydraulic cylinder.
Accompanying drawing explanation
Fig. 1 be in background technique three chamber cylinders as the sectional view of actuator system.
Fig. 2 is the sectional view of a kind of valve-controlled cylinder system for unbalanced load of the present invention.
In figure: 1-displacement transducer sliding bar, 2-displacement transducer sleeve, 3-cylinder barrel, 4-piston rod, 5-liquid controling cavity A, 6-hydraulic control mouth A, 7-liquid controling cavity B, 8-hydraulic control mouth B, 9-liquid controling cavity C, 10-hydraulic control mouth C, 11-servovalve A, 12-servovalve B, 13-accumulator.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed mode of execution and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 2, a kind of valve-controlled cylinder system for unbalanced load of the present embodiment, comprise cylinder barrel 3, piston rod 4, hydraulic control mouth A6, hydraulic control mouth B8, hydraulic control mouth C10, also comprise displacement transducer sliding bar 1, displacement transducer sleeve 2, servovalve A11 and servovalve B12.The wherein central axes of displacement transducer sliding bar 1, displacement transducer sleeve 2, cylinder barrel 3, piston rod 4, displacement transducer sleeve 2, cylinder barrel 3, piston rod 4 are hollow structure; Piston rod 4 is nested within cylinder barrel 3, and can centrally axial sliding movement; Cylinder barrel 3 lower end has the tapped hole for installation position displacement sensor sleeve 2, be connected threadably between displacement transducer sleeve 2 with cylinder barrel 3 and seal with seal ring, the front end of displacement transducer sleeve 2 is inserted within cylinder barrel 3, rear end is positioned at the outside of cylinder barrel 3, the rear end of displacement transducer sleeve 2, with controller, is positioned at the outside of cylinder barrel 3 after connection; Piston rod 4 upper end has the tapped hole of fixed displacement sensor sliding bar 1, is connected threadably and seals with seal ring between displacement transducer sliding bar 1 with piston rod 4; Displacement transducer sliding bar 1 is placed within displacement transducer sleeve 2, and can centrally axial sliding movement; Liquid controling cavity A5 is formed between cylinder barrel 3 and piston rod 4 lower end, fluid enters liquid controling cavity A5 by hydraulic control mouth A6, form liquid controling cavity C9 between cylinder barrel 3 and piston rod 4 upper end, fluid enters liquid controling cavity C9 by hydraulic control mouth C10, and the moving contact face seal ring between cylinder barrel 3 and piston rod 4 seals; Form liquid controling cavity B7 between displacement transducer sleeve 2 and cylinder barrel 3, fluid enters liquid controling cavity B6 by hydraulic control mouth B8, and the moving contact face seal ring between displacement transducer sleeve 2 and cylinder barrel 3 seals; The oil-feed port P of servovalve A11 is connected with high pressure oil, and oil return inlet T is connected with fuel tank, and restriction A blocks, and restriction B is connected with liquid controling cavity A5 by hydraulic control mouth A6; The oil-feed port P of servovalve B12 is connected with high pressure oil, and oil return inlet T is connected with fuel tank, and restriction A is connected with liquid controling cavity C9 by hydraulic control mouth C10, and restriction B is connected with liquid controling cavity B7 by hydraulic control mouth B8.
Described displacement transducer sliding bar 1 is for having the rod-like structure of sensor function.
As shown in Figure 2, disclosed in the present embodiment, a kind of working procedure of the valve-controlled cylinder system for unbalanced load is:
When piston rod 4 is with dynamic load to move upward, servovalve A11 leads directly to, and high pressure oil enters liquid controling cavity A5, in order to offset unbalanced load through restriction B, the hydraulic control mouth A6 of servovalve A11, by controlling the restriction aperture of servovalve, make the pressure remained steady of counter balance pocket; Servovalve B12 leads directly to, high pressure oil enters liquid controling cavity B7 through restriction B, the hydraulic control mouth B8 of servovalve B12, in order to overcome other load except unbalanced load, so that piston rod 4 is with dynamic load to stretch out, by controller and displacement transducer, can the displacement of Real-Time Monitoring piston rod 4, form the closed loop control to piston rod 4, described displacement transducer comprises displacement transducer sliding bar 1 and displacement transducer sleeve 2.
When the dynamic load of piston rod band moves downward, servovalve A11 tiltedly leads to, fluid from liquid controling cavity A5 by the restriction B of hydraulic control mouth A6, servovalve A11, get back to fuel tank, unbalanced load is offset by the throttling action of restriction B, by controlling the restriction aperture of servovalve, make the pressure remained steady of counter balance pocket; Servovalve B12 tiltedly leads to, high pressure oil enters liquid controling cavity C9 through restriction A, the hydraulic control mouth C10 of servovalve B12, in order to overcome other load except unbalanced load, so that piston rod 4 is with dynamic load to retract, by controller and displacement transducer, can the displacement of Real-Time Monitoring piston rod 4, form the closed loop control to piston rod 4.
A kind of valve-controlled cylinder system for unbalanced load of the present embodiment, the liquid controling cavity A5 controlled by servovalve A11 is for balanced load, can make the pressure remained steady of counter balance pocket, the liquid controling cavity B7 controlled by servovalve B12, liquid controling cavity C9 drive load movement for driving cylinder body.By controller and displacement transducer, servovalve A11, servovalve B12 accurately can control it according to the size and location of load, and better balanced load and command displacement obtain higher control accuracy.
Claims (3)
1. the valve-controlled cylinder system for unbalanced load, comprise cylinder barrel (3), piston rod (4), hydraulic control mouth A (6), hydraulic control mouth B (8), hydraulic control mouth C (10), described cylinder barrel (3), piston rod (4) are hollow structure, piston rod (4) is nested within cylinder barrel (3), and can centrally axial sliding movement; It is characterized in that: also comprise displacement transducer sliding bar (1), displacement transducer sleeve (2), servovalve A (11) and servovalve B (12); Described displacement transducer sleeve (2) is hollow structure; The central axes of described displacement transducer sliding bar (1), displacement transducer sleeve (2), cylinder barrel (3), piston rod (4); Cylinder barrel (3) lower end has the tapped hole for installation position displacement sensor sleeve (2), be connected threadably between displacement transducer sleeve (2) with cylinder barrel (3) and seal with seal ring, the front end of displacement transducer sleeve (2) is inserted within cylinder barrel (3), rear end is positioned at the outside of cylinder barrel (3), the rear end of displacement transducer sleeve (2), with controller, is positioned at the outside of cylinder barrel (3) after connection; Piston rod (4) upper end has the tapped hole of fixed displacement sensor sliding bar (1), is connected threadably and seals with seal ring between displacement transducer sliding bar (1) with piston rod (4); Displacement transducer sliding bar (1) is placed within displacement transducer sleeve (2), and can centrally axial sliding movement; Liquid controling cavity A (5) is formed between cylinder barrel (3) and piston rod (4) lower end, fluid enters liquid controling cavity A (5) by hydraulic control mouth A (6), liquid controling cavity C (9) is formed between cylinder barrel (3) and piston rod (4) upper end, fluid enters liquid controling cavity C (9) by hydraulic control mouth C (10), and the moving contact face seal ring between cylinder barrel (3) and piston rod (4) seals; Liquid controling cavity B (7) is formed between displacement transducer sleeve (2) and cylinder barrel (3), fluid enters liquid controling cavity B (6) by hydraulic control mouth B (8), and the moving contact face seal ring between displacement transducer sleeve (2) and cylinder barrel (3) seals; The oil-feed port P of servovalve A (11) is connected with high pressure oil, and oil return inlet T is connected with fuel tank, and restriction A blocks, and restriction B is connected with liquid controling cavity A (5) by hydraulic control mouth A (6); The oil-feed port P of servovalve B (12) is connected with high pressure oil, oil return inlet T is connected with fuel tank, restriction A is connected with liquid controling cavity C (9) by hydraulic control mouth C (10), and restriction B is connected with liquid controling cavity B (7) by hydraulic control mouth B (8).
2. a kind of valve-controlled cylinder system for unbalanced load as claimed in claim 1, is characterized in that: described displacement transducer sliding bar (1) is for having the rod-like structure of sensor function.
3. a kind of valve-controlled cylinder system for unbalanced load as claimed in claim 1 or 2, it is characterized in that: working procedure is, when the dynamic load of piston rod (4) band moves upward, servovalve A (11) leads directly to, high pressure oil enters liquid controling cavity A (5) through restriction B, the hydraulic control mouth A (6) of servovalve A (11), in order to offset the gravity of unbalanced load, by controlling the restriction aperture of servovalve, make the pressure remained steady of counter balance pocket; Servovalve B (12) leads directly to, high pressure oil enters liquid controling cavity B (7) through restriction B, the hydraulic control mouth B (8) of servovalve B (12), in order to overcome other load except unbalanced load, so that the dynamic load of piston rod (4) band is stretched out, by the displacement of controller and displacement transducer Real-Time Monitoring piston rod (4), form the closed loop control to piston rod (4), improve the control accuracy to piston rod (4) displacement;
When the dynamic load of piston rod (4) band moves downward, servovalve A (11) tiltedly leads to, fluid from liquid controling cavity A (5) by the restriction B of hydraulic control mouth A (6), servovalve A (11), get back to fuel tank, unbalanced load is offset by the throttling action of restriction B, by controlling the restriction aperture of servovalve, make the pressure remained steady of counter balance pocket; Servovalve B (12) tiltedly leads to, high pressure oil enters liquid controling cavity C (9) through restriction A, the hydraulic control mouth C (10) of servovalve B (12), in order to overcome other load except unbalanced load, so that the dynamic load of piston rod (4) band is retracted, by the displacement of controller and displacement transducer Real-Time Monitoring piston rod (4), form the closed loop control to piston rod (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510115702.9A CN104847732B (en) | 2015-03-17 | 2015-03-17 | A kind of valve-controlled cylinder system for unbalanced load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510115702.9A CN104847732B (en) | 2015-03-17 | 2015-03-17 | A kind of valve-controlled cylinder system for unbalanced load |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104847732A true CN104847732A (en) | 2015-08-19 |
| CN104847732B CN104847732B (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510115702.9A Expired - Fee Related CN104847732B (en) | 2015-03-17 | 2015-03-17 | A kind of valve-controlled cylinder system for unbalanced load |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052283A (en) * | 2017-02-10 | 2017-08-18 | 中冶赛迪工程技术股份有限公司 | A kind of crystallizer vibration control device |
| CN110307207A (en) * | 2019-06-25 | 2019-10-08 | 同济大学 | A kind of hydraulic cylinder displacement sensor cooling flow control device |
| JP2020514055A (en) * | 2017-11-02 | 2020-05-21 | 中科聚信潔能熱鍛装備研発股▲分▼有限公司Ｚｈｏｎｇｋｅｊｕｘｉｎ Ｃｌｅａｎ Ｅｎｅｒｇｙ ＆ Ｈｏｔ Ｆｏｒｇｉｎｇ Ｅｑｕｉｐｍｅｎｔ Ｒｅｓｅａｒｃｈ Ａｎｄ Ｄｅｖｅｌｏｐｍｅｎｔ Ｃｏ．， Ｌｔｄ． | Highly efficient and low wear return cylinder for hydraulic press and method of operating same |
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| CN2324308Y (en) * | 1996-11-15 | 1999-06-16 | 长江水利委员会长江科学院控制设备研究所 | Electric valve control cylinder type electrohydraulic servo device for speed regulator of hydroturbine |
| JP2006194325A (en) * | 2005-01-12 | 2006-07-27 | Bosch Rexroth Corp | Hydraulic drive mechanism |
| WO2006089863A1 (en) * | 2005-02-23 | 2006-08-31 | John Deere Forestry Oy | A compensating coupling in the control of a motor |
| CN103148063A (en) * | 2013-03-22 | 2013-06-12 | 太原科技大学 | Position and pressure master-slave control method of hydraulic servo system of valve-controlled cylinder |
| CN203892280U (en) * | 2014-06-09 | 2014-10-22 | 常州信息职业技术学院 | Electro-hydraulic proportional valve control system of combined machine tool |
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2015
- 2015-03-17 CN CN201510115702.9A patent/CN104847732B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2324308Y (en) * | 1996-11-15 | 1999-06-16 | 长江水利委员会长江科学院控制设备研究所 | Electric valve control cylinder type electrohydraulic servo device for speed regulator of hydroturbine |
| JP2006194325A (en) * | 2005-01-12 | 2006-07-27 | Bosch Rexroth Corp | Hydraulic drive mechanism |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052283A (en) * | 2017-02-10 | 2017-08-18 | 中冶赛迪工程技术股份有限公司 | A kind of crystallizer vibration control device |
| CN107052283B (en) * | 2017-02-10 | 2023-08-15 | 中冶赛迪工程技术股份有限公司 | Crystallizer vibration control device |
| JP2020514055A (en) * | 2017-11-02 | 2020-05-21 | 中科聚信潔能熱鍛装備研発股▲分▼有限公司Ｚｈｏｎｇｋｅｊｕｘｉｎ Ｃｌｅａｎ Ｅｎｅｒｇｙ ＆ Ｈｏｔ Ｆｏｒｇｉｎｇ Ｅｑｕｉｐｍｅｎｔ Ｒｅｓｅａｒｃｈ Ａｎｄ Ｄｅｖｅｌｏｐｍｅｎｔ Ｃｏ．， Ｌｔｄ． | Highly efficient and low wear return cylinder for hydraulic press and method of operating same |
| CN110307207A (en) * | 2019-06-25 | 2019-10-08 | 同济大学 | A kind of hydraulic cylinder displacement sensor cooling flow control device |
| CN110307207B (en) * | 2019-06-25 | 2020-07-07 | 同济大学 | Cooling flow control device of hydraulic cylinder displacement sensor |
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| CN104847732B (en) | 2016-08-17 |
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