CN102979787A - Hydraulic three-position control mechanism with automatic middle position returning function - Google Patents
Hydraulic three-position control mechanism with automatic middle position returning function Download PDFInfo
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- CN102979787A CN102979787A CN2012105248860A CN201210524886A CN102979787A CN 102979787 A CN102979787 A CN 102979787A CN 2012105248860 A CN2012105248860 A CN 2012105248860A CN 201210524886 A CN201210524886 A CN 201210524886A CN 102979787 A CN102979787 A CN 102979787A
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Abstract
The invention discloses a hydraulic three-position control mechanism with an automatic middle returning function, and belongs to the field of hydraulic control. After the high-pressure oil of the mechanism enters from an oil inlet 7, one path of the high-pressure oil passes through a first oil nozzle 1, and the other path of the high-pressure oil passes through a second oil nozzle 2; one path of oil circuit flowing through the first oil nozzle 1 is communicated with an oil outlet 8 after passing through a first switching valve 5; the other path is communicated with an upper cavity formed by a piston rod; one path of oil circuit flowing through the second oil nozzle 2 is communicated with the oil outlet 8 after passing through a second switching valve 6; the other path is communicated with a lower cavity formed by the piston rod; the initial position of the piston rod is the middle of a hollow cavity; the upper oil cutting edge and the lower oil cutting edge of the piston rod and an annular groove on the middle of the inner wall of the hollow cavity form a negative-feedback valve port; and the upper cavity and the lower cavity are respectively communicated with the oil outlet 8 via the negative-feedback valve port and a third oil nozzle 3. According to the hydraulic three-position control mechanism with the automatic middle position returning function, which is disclosed by the invention, the function of three-position control of the traditional three-position mechanism can be effectively realized, the hydraulic three-position control mechanism with the automatic middle position returning function has the advantages of simple structure, good dynamic response, high position precision, adjustable three positions, high reliability and strong middle-position disturbance rejection capability, automatic middle position return can be realized under the situation that the control valve loses efficiency, and big power can be output by the middle position under the condition that an extremely-high position precision is satisfied.
Description
Affiliated technical field
The present invention is a kind of three control mechanisms of hydraulic pressure with function in the auto back, belongs to the hydraulic control field.
Prior art
Common three control mechanisms of hydraulic pressure with function in the auto back can be divided into according to the difference of driving force that gas-liquid pressure drives and two kinds of forms of electromagnetic force driving.
Three control mechanisms of gas-liquid pressure drive form, the size or the direction that rely on valve part to change gas-liquid pressure make mechanism move by predetermined rule, realize motion parts only leaning on three positions by mechanical position limitation mechanism again, such as minimum, meta and maximum position, or as left position, meta and right position etc.These type of three control mechanism structures are complicated, and motive sealing is had more harsh requirement, and structure often needing than large space to realize, size and weight are larger, and dynamic response is slow, and reliability is low.
The electricity of the power-actuated form dependence of electromagnetism solenoid and so on-Li conversion element driving mechanism action, and the Returnning spring of larger rigidity is installed at the two ends of active part, rely on the break-make of electromagnetic force and three controls that commutation realizes minimum, meta and maximum position, these type of three mechanisms the power of neutral position output a little less than, the size of this ouput force is determined by the meta position static difference that Returnning spring rigidity and load cause, if guarantee that static difference is qualified, and ouput force is larger, then must improves rigidity; If Returnning spring rigidity is very large, then the electromagnetic force of keeping at minimum and maximum position will be very large, and it is then stronger to keep electric current, and namely driving power is very large; Because output work and output power are zero, then heating is more serious again, and reliability is lower.
Summary of the invention
The objective of the invention is: in order to overcome the shortcomings and limitations of existing three level control devices, the present invention proposes a kind of three control mechanisms of hydraulic pressure with function in the auto back.
To achieve these goals, technological scheme of the present invention is: a kind of three control mechanisms of hydraulic pressure with function in the auto back, comprise that mainly housing, switch valve I 5, switch valve II 6, oil chews I 1, and oil is chewed II 2, and oil is chewed III 3 and piston rod 4; Described piston rod 4 is divided into epicoele and cavity of resorption with a cavity in the housing, and adjustable mechanical position limitation mechanism is arranged respectively in epicoele and the cavity of resorption, and there is circular groove at described cavity inner wall middle part;
After high pressure oil entered from filler opening 7, one road oil of flowing through was chewed I 1, and another road oil of flowing through is chewed II 2; The oil circuit one tunnel that the oil of flowing through is chewed I 1 is communicated with oil outlet 8 after switch valve I 5, and the epicoele that another road and piston rod 4 form is communicated with; The oil circuit one tunnel that the oil of flowing through is chewed II 2 is communicated with oil outlet 8 after switch valve II 6, and the cavity of resorption that another road and piston rod 4 form is communicated with; Piston rod 4 initial positions are the cavity middle part, and the upper incision oil limit of piston rod 4 and the circular groove at cavity inner wall middle part form the reverse feedback valve port, and epicoele and cavity of resorption oil are chewed III 3 through reverse feedback valve port, oil successively and is communicated with oil outlet 8; Described reverse feedback valve port pretravel+0.1mm.
Consult Fig. 2, when switch valve I 5, switch valve II 6 are all in the closed position, after high pressure oil enters from filler opening 7, chewing I 1 and oil through oil respectively chews II 2 and flows into piston rod 4 epicoeles and cavity of resorptions, piston rod 4 upper and lower cavities are high pressure oil, because piston rod 4 initial positions are the neutral position, the feedback valve port is symmetrical, and meta is motionless.When having load or load larger, piston rod 4 moves, the aperture that feed back valve port this moment changes, cause that upper and lower cavity pressure changes, balanced load also makes piston get back to meta, consequently piston can be at the mobile segment distance of the direction of load push-and-pull, until the pressure of upper and lower cavity is with load balance.Because valve port is the reverse feedback valve port of differential type, and the secondary amplification of process piston area, limit by the annular groove pretravel again, so this meta is very little by the position static difference that load and disturbance thereof form, be can accept on engineering is used also can control.
Consult Fig. 1, switch valve I 5 connects, when switch valve II 6 is closed, and piston rod 4 epicoele oil are communicated with oil outlet 8 after switch valve I 5; High pressure oil enters by oil from filler opening 7 and chews II 2 inflow piston rods 4 cavity of resorptions simultaneously, like this, piston rod 4 epicoele low pressure, the cavity of resorption high pressure moves only upper limit place on the piston rod 4; Piston rod 4 moves to retracted position as actuation mechanism.
Consult Fig. 3, switch valve I 5 is closed, when switch valve II 6 is connected, after high pressure oil enters from filler opening 7, chew I 1 from oil and flow into piston rod 4 epicoeles, simultaneously, piston rod 4 cavity of resorption oil are communicated with oil outlet 8 through switch valve II 6, like this, piston rod 4 epicoele high pressure, cavity of resorption low pressure, piston rod 4 moves down only lower limit place; Piston rod 4 moves to extended position as actuation mechanism.
The invention has the beneficial effects as follows: this invention can effectively realize the function of three positioning control of three mechanisms of tradition, and simple in structure, dynamic response is good, and positional accuracy is high, and three adjustable; Reliability is high, in the situation that control valve lost efficacy, can realize in the auto back, and the meta Ability of Resisting Disturbance is strong, and meta can satisfy the larger power of output under the condition of high positional accuracy.
Description of drawings
Fig. 1 is three mechanism's retracted position working state schematic representations among the present invention;
Fig. 2 is three mechanism's neutral position working state schematic representations among the present invention;
Fig. 3 is three mechanism's extended position working state schematic representations among the present invention.
Among the figure, 1-oil is chewed I, and the 2nd, oil is chewed II, and the 3rd, oil is chewed III, 4-piston rod, 5-switch valve I, 6-switch valve II, 7-filler opening, 8-oil outlet
Embodiment
Three control mechanisms of hydraulic pressure that have function in the auto back in the present embodiment are given for three equilibrium positions of centrifugal fly weight formula speed setting unit.The hydraulic machinery control field of power plant, centrifugal fly weight formula speed setting unit commonly used carries out the control of closed loop rotating speed, device of the present invention is combined with centrifugal fly weight formula speed setting unit, can be for different operating modes, the rotating speed equinoctial point is carried out three kinds of settings, to satisfy the higher control requirement of main frame.
Three control mechanisms of hydraulic pressure that have function in the auto back in the present embodiment comprise that mainly housing, switch valve I 5, switch valve II 6, oil chews I 1, and oil is chewed II 2, and oil is chewed III 3 and piston rod 4; Described piston rod 4 is divided into epicoele and cavity of resorption with the cavity that casing lining cover forms, and adjustable mechanical position limitation mechanism is arranged respectively in epicoele and the cavity of resorption, and there is circular groove at described cavity inner wall middle part; Mechanical position limitation mechanism in the present embodiment is for adjusting screw.
After high pressure oil entered from filler opening 7, one road oil of flowing through was chewed I 1, and another road oil of flowing through is chewed II 2; The oil circuit one tunnel that the oil of flowing through is chewed I 1 is communicated with oil outlet 8 after switch valve I 5, and the epicoele that another road and piston rod 4 form is communicated with; The oil circuit one tunnel that the oil of flowing through is chewed II 2 is communicated with oil outlet 8 after switch valve II 6, and the cavity of resorption that another road and piston rod 4 form is communicated with; Piston rod 4 initial positions are the cavity middle part, and the upper incision oil limit of piston rod 4 and the circular groove at cavity inner wall middle part form the reverse feedback valve port, and epicoele and cavity of resorption oil are chewed III 3 through reverse feedback valve port, oil successively and is communicated with oil outlet 8; Described reverse feedback valve port pretravel+0.1mm.
Consult Fig. 2, when switch valve I 5, switch valve II 6 are all in the closed position, after high pressure oil enters from filler opening 7, chewing I 1 and oil through oil respectively chews II 2 and flows into piston rod 4 epicoeles and cavity of resorptions, piston rod 4 upper and lower cavities are high pressure oil, because piston rod 4 initial positions are the neutral position, the feedback valve port is symmetrical, and meta is motionless.When having load or load larger, piston rod 4 moves, the aperture that feed back valve port this moment changes, cause that upper and lower cavity pressure changes, balanced load also makes piston get back to meta, consequently piston can be at the mobile segment distance of the direction of load push-and-pull, until the pressure of upper and lower cavity is with load balance.Because valve port is the reverse feedback valve port of differential type, and the secondary amplification of process piston area, limit by the annular groove pretravel again, so this meta is very little by the position static difference that load and disturbance thereof form, be can accept on engineering is used also can control.
Consult Fig. 1, switch valve I 5 connects, when switch valve II 6 is closed, and piston rod 4 epicoele oil are communicated with oil outlet 8 after switch valve I 5; High pressure oil enters by oil from filler opening 7 and chews II 2 inflow piston rods 4 cavity of resorptions simultaneously, like this, piston rod 4 epicoele low pressure, the cavity of resorption high pressure moves only upper limit place on the piston rod 4; Piston rod 4 moves to retracted position as actuation mechanism.
Consult Fig. 3, switch valve I 5 is closed, when switch valve II 6 is connected, after high pressure oil enters from filler opening 7, chew I 1 from oil and flow into piston rod 4 epicoeles, simultaneously, piston rod 4 cavity of resorption oil are communicated with oil outlet 8 through switch valve II 6, like this, piston rod 4 epicoele high pressure, cavity of resorption low pressure, piston rod 4 moves down only lower limit place; Piston rod 4 moves to extended position as actuation mechanism.
Claims (3)
1. three control mechanisms of hydraulic pressure with function in the auto back is characterized in that: comprise that mainly housing, switch valve I (5), switch valve II (6), oil chews I (1), oil is chewed II (2), and oil is chewed III (3) and piston rod (4); Described piston rod (4) is divided into epicoele and cavity of resorption with a cavity in the housing, and adjustable mechanical position limitation mechanism is arranged respectively in epicoele and the cavity of resorption, and there is circular groove at described cavity inner wall middle part; After high pressure oil entered from filler opening (7), one road oil of flowing through was chewed I (1), and another road oil of flowing through is chewed II (2); The oil circuit one tunnel that the oil of flowing through is chewed I (1) is communicated with oil outlet (8) after switch valve I (5), and the epicoele that another road and piston rod (4) form is communicated with; The oil circuit one tunnel that the oil of flowing through is chewed II (2) is communicated with oil outlet (8) after switch valve II (6), and the cavity of resorption that another road and piston rod (4) form is communicated with; Piston rod (4) initial position is the cavity middle part, and the upper incision oil limit of piston rod (4) and the circular groove at cavity inner wall middle part form the reverse feedback valve port, and epicoele and cavity of resorption oil are chewed III (3) through reverse feedback valve port, oil successively and is communicated with oil outlet (8).
2. three control mechanisms of hydraulic pressure with function in the auto back as claimed in claim 1 is characterized in that: described reverse feedback valve port pretravel+0.1mm.
3. three control mechanisms of hydraulic pressure with function in the auto back as claimed in claim 1 is characterized in that: the capable of regulating mechanical position limitation mechanism in described epicoele and the cavity of resorption is for adjusting screw.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210524886.0A CN102979787B (en) | 2012-12-10 | 2012-12-10 | A kind of have hydraulic pressure three control mechanisms automatically returning middle function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210524886.0A CN102979787B (en) | 2012-12-10 | 2012-12-10 | A kind of have hydraulic pressure three control mechanisms automatically returning middle function |
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| CN102979787A true CN102979787A (en) | 2013-03-20 |
| CN102979787B CN102979787B (en) | 2015-10-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2529854Y (en) * | 2002-03-15 | 2003-01-08 | 师平平 | Positive displacement automatic charger |
| DE102005060587A1 (en) * | 2005-12-17 | 2007-07-05 | Serto Jacob Gmbh | Differential pressure valve |
| CN101109478A (en) * | 2006-06-15 | 2008-01-23 | 王东升 | Valve type oil feeder |
| CN101850219A (en) * | 2010-04-29 | 2010-10-06 | 哈尔滨工程大学 | Continuous flow self-adjusting dosing device |
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2012
- 2012-12-10 CN CN201210524886.0A patent/CN102979787B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2529854Y (en) * | 2002-03-15 | 2003-01-08 | 师平平 | Positive displacement automatic charger |
| DE102005060587A1 (en) * | 2005-12-17 | 2007-07-05 | Serto Jacob Gmbh | Differential pressure valve |
| CN101109478A (en) * | 2006-06-15 | 2008-01-23 | 王东升 | Valve type oil feeder |
| CN101850219A (en) * | 2010-04-29 | 2010-10-06 | 哈尔滨工程大学 | Continuous flow self-adjusting dosing device |
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| CN102979787B (en) | 2015-10-28 |
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