CN104500510A - Hydraulic delay control device - Google Patents
Hydraulic delay control device Download PDFInfo
- Publication number
- CN104500510A CN104500510A CN201410813264.9A CN201410813264A CN104500510A CN 104500510 A CN104500510 A CN 104500510A CN 201410813264 A CN201410813264 A CN 201410813264A CN 104500510 A CN104500510 A CN 104500510A
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- China
- Prior art keywords
- piston
- hydraulic
- throttling groove
- control
- delay control
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/10—Delay devices or arrangements
Abstract
The invention provides a hydraulic delay control device. The hydraulic delay control device is characterized in that a piston is arranged in axial hole; one end of the piston is sleeved with a spring and is supported through an axial hole by means of steps, and while the other end of the piston is equipped with a throttling piston; the movement of a moving piston is driven and limited through the pressure of a driving cavity, the pressure of a control cavity and an one-way valve; the rear end of the axial hole is sealed to locate the throttle piston, so as to delay the displacement drive time of a controlled part. The hydraulic delay control device is simple in structure and convenient to use; a complex hydraulic control system is decreased, and a sensor and a complex delay control circuit are saved; therefore, the hydraulic delay control device has a wide application and popularization prospect.
Description
Technical field
The present invention relates to a kind of hydraulic controller, particularly a kind ofly in hydraulic control system, apply the device that hydraulic structure carries out delays time to control.
Technical background
In hydraulic control system, various controlling functions realizes mainly through hydrovalve.Under many circumstances, specifically controlling object to reach, when needing some parameters in hydraulic system to meet certain condition, the action of hydrovalve being controlled, or send in control command and after time delay a period of time, the action of hydrovalve controlled.
The first typical case is the closed loop control to certain parameter of load, in this case, when there being control signal to be applied in hydraulic control system, hydraulic control system produces corresponding control command and makes hydraulic control system comprise hydrovalve to produce corresponding control action A at interior control unit, there is adjustment or change in some parameter of ordering about hydraulic system and load, corresponding sensor is utilized to detect the parameter of load, once the parameter controlled reaches certain value preset, then touch hydraulic control system at once and produce corresponding control command B, change the control action of control unit.The evident characteristic of this process is: (1) control unit must comprise load parameter sensor and usually comprise hydrovalve; (2) condition that action A to action B changes is that controlled parameter reaches certain value preset.Owing to have employed load parameter sensor, add the complexity of system, reduce the reliability of system.
The second typical case is the closed loop control of delays time to control replacement to parameter to hydrovalve, in this case, when there being control signal to be applied in hydraulic control system, hydraulic control system produces corresponding control command and makes hydraulic control system comprise hydrovalve to produce corresponding control action A at interior control unit, there is adjustment or change in some parameter of ordering about hydraulic system and load, the control circuit in whole control system is utilized to carry out time delay, time delay a period of time is with after guaranteeing that controlled parameter reaches certain value preset, directly produce corresponding control command B by hydraulic control system, change the control action of control unit.The evident characteristic of this process is: (1) control system saves at least one load parameter sensor; (2) control system needs to increase in an existing electrical circuit delay function or increases a special delay circuit specially; (3) control unit must adopt electrohydraulic control element.When the delay circuit needing special increase by special, too increase the complexity of system equally, in some occasion, even need to consider safety problem, as the Explosion-Proof when underground coal mine uses.
The present invention will provide a kind of hydraulic delay device, this hydraulic delay device can after control command provides, time delay through after a while produces next action, its advantage is the load parameter sensor that namely can save in the first situation, also can save the delay circuit in the second situation, reach control object simultaneously.
Summary of the invention
The concrete technical problems that the present invention will solve in simple hydraulic control architectures, how to set up hydraulic delay control structure carry out delays time to control, and then provide a kind of hydraulic delay control gear.
Based on above-mentioned purpose, the measure that the present invention takes is as follows.
A kind of hydraulic delay control gear, includes the oil inlet passage of a housings close, and the controlled parts in the axial bore be communicated with described oil inlet passage by pressure oil realize the hydraulic controller of Bit andits control, it is characterized in that:
In described axial bore, be provided with piston, be arranged with Returnning spring in one end of described piston and supported by the Returnning spring support level of axial bore; The other end is provided with a flow check piston; Described flow check piston two ends are communicated with by one-way valve, and the hydraulic oil of one-way valve flows from control chamber b to actuator chamber a; Described flow check piston is driven by actuator chamber pressure p 1 and control chamber pressure p 2 pairs of piston advances forward and spacing, and axial bore back-end sealing also positions flow check piston, realizes the displacement drive time lengthening to controlled parts.
Further, in a kind of hydraulic delay device, the circumferencial direction of described flow check piston has throttling groove.
Further, in a kind of hydraulic delay device, the shape of cross section structure of described throttling groove is triangle, circular arc or rectangle.
Further, in a kind of hydraulic delay device, described throttling groove width w < 1mm, throttling groove degree of depth h < 0.5mm, throttling groove length/throttling groove hydraulic diameter > 4.
Realize the technological scheme of above-mentioned the provided a kind of hydraulic delay control gear of the present invention, compared with prior art, advantage that is that it directly brings and that certainly lead to and good effect are:
The present invention carries out the hydraulic system controlled according to the value of load parameter for some needs, usually corresponding load parameter sensor is needed, while this increases system complexity, the prior reliability being reduction of system, when delays time to control can be adopted to replace sensor detection control, adopt the present invention can simplied system structure, improve the reliability of system.
At some special occasions, as underground coal mine, need to carry out technological processing for explosion protection feature to control unit, compared with employing " circuit delay technology adds electrohydraulic control element " scheme, adopt the present invention can greatly reduce technological processing for explosion protection feature difficulty.
Itself do not comprise the hydraulic system of computer or PLC control at some, when needs carry out delay operation, adopt the present invention can reduce the complexity of system.
Accompanying drawing explanation
Fig. 1 is the structural representation of hydraulic delay device of the present invention.
Fig. 2 is existing hydraulic principle structural representation.
Fig. 3 is throttling grooves structure schematic diagram of the present invention.
Fig. 4 is triangular groove structural representation of the present invention.
Fig. 5 is arc groove structural representation of the present invention.
Fig. 6 is rectangular groove structure schematic diagram of the present invention.
Fig. 7 is the hydraulic delay working principle structural representation of the embodiment of the present invention.
In figure: 1: housing; 2: piston; 3: flow check piston; 4: one-way valve; 5: seal ring; 6: housing screw; 7: Returnning spring; 8: controlled parts; 9: sealing compressing tablet; 10: liquid controlled reversing valve body.
P1: actuator chamber pressure; P2: control chamber pressure; T: return opening; W: throttling groove width; H: the throttling groove degree of depth; L: piston stroke; A: actuator chamber; B: control chamber; S1: Returnning spring support level; S2: flow check piston limited step; K: axial bore; K1: axial bore oil duct; K2: axial bore filler opening oil duct; I: throttling groove; J: filler opening; X0: piston-initial-position; X1: controlled member initial position; X2: destination locations.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is made an explanation.
As Fig. 1-Fig. 7, implement a kind of hydraulic delay control gear that the present invention is above-mentioned provided, when hydraulic control signal drives by control elements, need through time delay rear driving by control elements.Realize delays time to control logic, for omitting required sensor, or delay circuit needed for omitting provides a kind of selection.Its structure, as Fig. 1, comprises a housing 1, the oil duct of its inner promising described time delay device processing and hole; A piston 2, axially moves in the axial bore K that can design in housing 1; A flow check piston 3, there are three Main Functions: effect one is to piston 2 sports limiting backward, effect two is compressed by seal ring 5 to realize sealing, and effect three is boss is processed with throttling groove I in the middle part of it, allow hydraulic oil by and realize limiting the speed that hydraulic oil passes through; An one-way valve 4, the actuator chamber pressure p 1 at connecting joint chute I two ends and control chamber pressure p 2; When control chamber pressure p 2 is greater than actuator chamber pressure p 1, hydraulic oil is allowed to flow through to actuator chamber a from control chamber b through one-way valve 4; And when control chamber pressure p 2 is less than actuator chamber pressure p 1, do not allow hydraulic oil to flow from actuator chamber a to control chamber b through one-way valve 4; A seal ring 5, for realizing the sealing to hydraulic oil in time delay device; A housing screw 6, for compressing flow check piston 3 and fixing the position designed within the case 1; A Returnning spring 7, for realizing the motion backward of piston 2, namely realizes the return of piston 2; Controlled parts 8, these controlled parts 8 belong to the parts needing deferred action, at the parts that different applications can be different, such as the spool that the hydraulicchange-over valve needing delays time to control can be hydraulicchange-over valve, for the spool that the Pilot operated check valve needing delays time to control can be Pilot operated check valve.
The actuator chamber pressure p 1 of hydraulic control signal, actuator chamber a can be entered into by oil circuit on housing 1, control chamber b is not entered by one-way valve 4, the hydraulic oil entering actuator chamber a can enter control chamber b by the throttling groove I in the middle part of flow check piston 3 on boss, but flow velocity is restricted, control chamber pressure p 2 is become after entering control chamber b, the hydraulic oil of control chamber b promotes piston 2 and travels forward, move after a segment distance piston stroke L, contact with controlled parts 8 and promote controlled parts 8 and travel forward, until control chamber pressure p 2 power be applied on piston 2 balances with the reaction force from controlled parts 8 or reaches the position that Returnning spring 7 is pressed to Returnning spring support level S1 by piston 2, controlling functions required for realization.When the actuator chamber pressure p 1 of control signal remove or drop to very low after, under the effect of Returnning spring 7, piston 2 moves backward, now control chamber pressure p 2 is greater than actuator chamber pressure p 1, one-way valve 4 is opened, and the hydraulic oil of oil pocket b flows out housing 1 quickly through one-way valve 4, to contact until piston 2 moves rearwards to and to be subject to spacing with flow check piston 3, realize the returning quickly of piston 2, controlled parts 8 are according to its Functional Design or motionless or also reset.
Implement a kind of hydraulic delay control gear of the present invention hydraulic delay controlling method as follows.
(1) the control oil from outside is communicated with actuator chamber a, and the hydraulic oil of actuator chamber a enters control chamber b by the throttling groove I on flow check piston 3, and the hydraulic oil driven plunger 2 entering control chamber b is moved.Described throttling groove I or to be called throttle orifice be elongated spiral segment chute,
(2) large by the resistance run into during throttling groove because control oil, the movement velocity of piston 2 is restricted, piston 2 needs axially to move after one section of delay time Td, shift piston stroke L and contacts with by controlling component 8, starts driver part 8 and moves, complete control action.
(3) when controlled parts 8 return, hydraulic oil enters actuator chamber a from control chamber b, through throttling groove I and one-way valve 4, then flows to outside oil circuit, relative to the process described in above-mentioned (1), can realize the fast return of controlled parts 8.
(4) throttling groove I is offered in the middle part of described flow check piston 3, the shape of cross section structure of throttling groove I is triangle, circular arc or rectangle, its maximum throttling groove width w, maximum throttling groove degree of depth h are smaller amounts, usual throttling groove width w≤1mm, throttling groove degree of depth h >=0.5mm, throttling groove I can design according to the requirement of delay time Td around length Lj along the circumferential direction, described throttling groove I should meet: throttling groove length/throttling groove hydraulic diameter > 4.
Implement a kind of hydraulic delay control gear of the present invention, the calculation method realizing the delay time Td that its hydraulic delay controls is as follows.
If the length of the throttling groove I on flow check piston 3 is Lj, cross section hydraulic diameter is d, its slenderness ratio meets Lj/d > 4.When using as time delay device, because little by the flow of time delay device throttling groove I, the flowing state of the hydraulic oil can thought in throttling groove I is laminar condition, on this basis delay time Td is estimated, according to Hydrodynamics Theory, pressure reduction between actuator chamber a and control chamber b is (p1-p2)=Δ p, and the kinetic viscosity of liquid is
μ, estimated as follows by throttling groove I flow q computational methods:
（1）
If the diameter of piston 2 is D, then the time that piston 2 moves to required for controlled member initial position x1 and piston stroke L from piston-initial-position x0 is:
（2）
The adjusting method of delay time Td:
Formula (2) is the evaluation method of delay time Td, can adjust, also can not adjust and calculate according to formula (1), (2) completely in application process to delay time Td.According to formula (2), the delay time Td of time delay device can be adjusted by piston stroke L.Therefore delay time Td can be adjusted in the following manner: the axial dimension 1. changing the push rod of piston 2, direct piston stroke L; 2. changing the axial dimension of the push rod of flow check piston 3, adjusting L by changing piston-initial-position x0; 3. increase a device, for adjusting the axial dimension between flow check piston 3 and piston 2, namely adjusting controlled member initial position x1, reaching the object of adjustment piston stroke L.
Implement a kind of hydraulic delay control gear of the present invention, compared with prior art, see accompanying drawing 2, controlled parts 8 start at controlled member initial position x1, after actuator chamber pressure p 1 rises to the motivation value pH of setting, controlled parts 8 setting in motion, period does not postpone substantially, until controlled parts 8 arrive destination locations x2, after actuator chamber pressure p 1 is reduced to the force value pL of certain setting, controlled parts 8 are back into controlled member initial position x1 by the return force from controlled parts 8, complete a control cycle.In whole process, seal ring 5, sealing compressing tablet 9, housing screw 6 realize sealing function, and oil return inlet T can take back oil pipe line to prevent the oil pocket choke-out of piston 2 front end.
The present invention is compared with above-mentioned prior art, see accompanying drawing 1, controlled parts 8 start at controlled member initial position x1, when not having control signal, actuator chamber pressure p 1 is very low, is less than the force value pL of a setting, the not enough power overcoming spring 7 of size of this pressure is carried out driven plunger 2 and is travelled forward, piston 2 is pulled to and contacts with flow check piston 3 under the effect of Returnning spring 7, and now piston 2 is at piston-initial-position x0, and flow check piston 3 plays the effect spacing to piston 2.After actuator chamber pressure p 1 rises to the motivation value pH of setting, the size of this pressure can overcome the power of Returnning spring 7 completely and be pushed ahead by piston 2, actuator chamber pressure p 1 also reaches motivation value pH, but cannot one-way valve 4 be passed through, control chamber b can only be entered by throttling groove I in the middle of flow check piston 3, and be reduced to control chamber pressure p 2, p2 driven plunger 2 is moved, throttling by throttling groove I limits, piston 2 slowly moves to controlled member initial position x1 from piston-initial-position x0, now controlled parts 8 also do not have setting in motion, through one section of delay time Td, piston 2 is to controlled member initial position x1, contact with controlled parts 8 and drive controlled parts 8 setting in motion until controlled parts 8 arrive destination locations x2, the delays time to control of controlled parts 8 is there is in this process implementation from motivation value pH, after actuator chamber pressure p 1 is reduced to the force value pL of setting, controlled parts 8 are pushed to controlled member initial position x1 from the return force of controlled parts 8 and the restoring force of Returnning spring 7, oil circuit is now except the throttling groove I on flow check piston 3, one-way valve 4 is opened, hydraulic oil from one-way valve 4 quickly through, controlled parts 8 are made to get back to controlled member initial position x1 fast, under the effect of Returnning spring 7, piston 2 continues to be moved back, until be subject to the spacing of flow check piston 3 and stop motion, piston 2 arrives piston-initial-position x0, completes a control cycle.In whole working procedure, seal ring 5, flow check piston 3, housing screw 6 realize sealing function.The feature of this process is, action from controlled parts 8 appear in motivation value pH, between have an obvious delay time Td, and after motivation value pH lays down, when controlled parts 8 return, then there is no time delay phenomenon.
Claims (4)
1. a hydraulic delay control gear, includes the oil inlet passage of a housings close, and the controlled parts in the axial bore be communicated with described oil inlet passage by pressure oil realize the hydraulic controller of Bit andits control, it is characterized in that:
In described axial bore (K), be provided with piston (2), be arranged with Returnning spring (7) in one end of described piston (2) and supported by the Returnning spring support level (S1) of axial bore (K); The other end is provided with a flow check piston (3); Described flow check piston (3) two ends are communicated with by one-way valve (4), and the hydraulic oil of one-way valve (4) flows from control chamber b to actuator chamber a; Described flow check piston (3) is driven by actuator chamber pressure p 1 and the motion of the control chamber pressure p 2 pairs of pistons (2) and spacing, axial bore (K) back-end sealing also positions flow check piston (3), realizes the displacement drive time lengthening to controlled parts (8).
2. hydraulic delay control gear as claimed in claim 1, is characterized in that: the garden circumferential direction of described flow check piston (3) has throttling groove (I).
3. hydraulic delay control gear as claimed in claim 2, is characterized in that: the shape of cross section structure of described throttling groove (I) is triangle, circular arc or rectangle.
4. hydraulic delay control gear as claimed in claim 2, it is characterized in that: described throttling groove width w < 1mm, throttling groove degree of depth h < 0.5mm, throttling groove length/throttling groove hydraulic diameter > 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410813264.9A CN104500510B (en) | 2014-12-24 | 2014-12-24 | A kind of hydraulic delay controls device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410813264.9A CN104500510B (en) | 2014-12-24 | 2014-12-24 | A kind of hydraulic delay controls device |
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| Publication Number | Publication Date |
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| CN104500510A true CN104500510A (en) | 2015-04-08 |
| CN104500510B CN104500510B (en) | 2016-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410813264.9A Expired - Fee Related CN104500510B (en) | 2014-12-24 | 2014-12-24 | A kind of hydraulic delay controls device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020198A (en) * | 2015-08-14 | 2015-11-04 | 孙晓君 | Hydraulic actuator and compound rocker arm |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU538161A1 (en) * | 1975-03-10 | 1976-12-05 | Научно-Производственное Объединение "Автоматгормаш" | Hydraulic time switch |
| DE3308687A1 (en) * | 1983-03-11 | 1984-09-13 | Robert Bosch Gmbh, 7000 Stuttgart | Relief device for a hydraulic system |
| EP0177620B1 (en) * | 1984-01-26 | 1988-11-02 | GebràDer Sulzer Aktiengesellschaft | Pressure fluid-actuated valve |
| CN1151479A (en) * | 1995-10-13 | 1997-06-11 | 三星电子株式会社 | Reciprocating compressor |
| CN102155462A (en) * | 2010-07-23 | 2011-08-17 | 三一重工股份有限公司 | Hydraulic oil cylinder and relevant device thereof, hydraulic buffer system, excavator and concrete pump truck |
| CN203500188U (en) * | 2013-10-18 | 2014-03-26 | 张志刚 | Pneumatic time-delay device |
| CN204003806U (en) * | 2014-03-18 | 2014-12-10 | 三一汽车制造有限公司 | A kind of time delay hydraulic pressure installation and hydraulic system of pump |
-
2014
- 2014-12-24 CN CN201410813264.9A patent/CN104500510B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU538161A1 (en) * | 1975-03-10 | 1976-12-05 | Научно-Производственное Объединение "Автоматгормаш" | Hydraulic time switch |
| DE3308687A1 (en) * | 1983-03-11 | 1984-09-13 | Robert Bosch Gmbh, 7000 Stuttgart | Relief device for a hydraulic system |
| EP0177620B1 (en) * | 1984-01-26 | 1988-11-02 | GebràDer Sulzer Aktiengesellschaft | Pressure fluid-actuated valve |
| CN1151479A (en) * | 1995-10-13 | 1997-06-11 | 三星电子株式会社 | Reciprocating compressor |
| CN102155462A (en) * | 2010-07-23 | 2011-08-17 | 三一重工股份有限公司 | Hydraulic oil cylinder and relevant device thereof, hydraulic buffer system, excavator and concrete pump truck |
| CN203500188U (en) * | 2013-10-18 | 2014-03-26 | 张志刚 | Pneumatic time-delay device |
| CN204003806U (en) * | 2014-03-18 | 2014-12-10 | 三一汽车制造有限公司 | A kind of time delay hydraulic pressure installation and hydraulic system of pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020198A (en) * | 2015-08-14 | 2015-11-04 | 孙晓君 | Hydraulic actuator and compound rocker arm |
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| CN104500510B (en) | 2016-10-26 |
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Granted publication date: 20161026 Termination date: 20171224 |