CN105179346A - Two-stage priority structure control valve block in closed-center load feedback hydraulic system - Google Patents
Two-stage priority structure control valve block in closed-center load feedback hydraulic system Download PDFInfo
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- CN105179346A CN105179346A CN201510486369.2A CN201510486369A CN105179346A CN 105179346 A CN105179346 A CN 105179346A CN 201510486369 A CN201510486369 A CN 201510486369A CN 105179346 A CN105179346 A CN 105179346A
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Abstract
A two-stage priority structure control valve block in a closed-center load feedback hydraulic system comprises a priority valve body, a load feedback one-way valve, a secondary priority valve balancing damper, a secondary priority valve element, a secondary priority valve restoration damper, a secondary priority valve restoration spring, a steering pressure-limiting valve, a primary priority valve restoration damper, a primary priority valve restoration spring, a primary priority valve element, a primary priority valve balancing damper and a primary priority valve check valve, wherein a casting cavity and a connecting oil path are formed in the priority valve body; the primary priority valve element, the primary priority valve restoration damper, the primary priority valve restoration spring, the primary priority valve balancing damper and the primary priority valve check valve are sequentially installed in the casting cavity; the secondary priority valve element, the secondary priority valve balancing damper, the secondary priority valve restoration damper and the secondary priority valve restoration spring are sequentially arranged in the casting cavity; all the components are arranged in the primary and secondary sequence and combined into a whole in the casting cavity of the priority valve body, and the interior portions of the components are connected through a casting oil path.
Description
Technical field
The invention belongs to tractor field, relate to a kind of wheeled tractor hydraulic system, particularly relate to a kind of two-stage priority structure control valve block closed in heart load feedback hydraulic system.
Background technique
At present, on the various model large power wheel tractors produced at home, high-grade tractor hydraulic system all adopts variable displacement pump band to close heart load feedback system.This type of closes in heart load feedback system, comprises: knuckle section, brake portion, Clutch Control part, lift portion and multi-way valve output.The pressure of each several part wherein can be balanced with pressure-gradient control valve.Existing pressure-gradient control valve is generally single-stage priority acccess control, in hydraulic system during integrated more module section, the hydraulic oil distribution needing multiple single-stage pressure-gradient control valve to carry out between disparate modules part controls, supporting multiple single-stage pressure-gradient control valve also needs to increase pipeline accordingly and connects, and arranges bring great inconvenience to design and installation.Therefore, a kind of reliable and stable two-stage priority structure control valve block is provided, on the basis simplifying tractor layout, the stability of hydraulic system can also be improved, required for this tractor design just, production.
Summary of the invention
The invention provides a kind of reliable and stable two-stage priority structure control valve block, the pressure closing many oil circuits in heart load feedback system only can be balanced with a pressure-gradient control valve block, thus the reliable and stable pressure balance that ensure that the oily demand of multiple use, distribute for the priority and pressure rating of closing different piece oil in heart load feedback system, simplify design of Hydraulic System and mounting arrangements structure simultaneously.
The present invention can achieve the above object by the following technical programs: close the two-stage priority structure control valve block in heart load feedback hydraulic system, comprising: pressure-gradient control valve valve body, load feedback one-way valve, secondary pressure-gradient control valve balance damping, secondary priority spool, secondary pressure-gradient control valve reset damping, secondary pressure-gradient control valve Returnning spring, turn to pressure-limit valve, one-level pressure-gradient control valve reset damping, one-level pressure-gradient control valve Returnning spring, one-level priority spool, one-level pressure-gradient control valve balance damping, one-level pressure-gradient control valve safety check; Pressure-gradient control valve valve body outer installment has access port, feedback hydraulic fluid port, control port, equipment hydraulic fluid port, external feedback mouth, turns to hydraulic fluid port, pressure tap, return opening eight connecting ports; Pressure-gradient control valve valve inner is provided with casting cavity and is connected oil duct, and one-level priority spool, one-level pressure-gradient control valve reset damping, one-level pressure-gradient control valve Returnning spring, the damping of one-level pressure-gradient control valve balance, one-level pressure-gradient control valve safety check are arranged in the casting cavity of access port successively; The damping of secondary priority spool, secondary pressure-gradient control valve balance, secondary pressure-gradient control valve reset damping, secondary pressure-gradient control valve Returnning spring are arranged in the casting cavity after one-level priority spool successively; Load feedback one-way valve is arranged on feedback oil port, external feedback mouth is connected to the load feedback one-way valve the other end, turn to pressure-limit valve and one-level pressure-gradient control valve to be installed in parallel and turn to oil port, all parts by one-level, secondary sequencing in the casting cavity of pressure-gradient control valve valve body in conjunction with as a whole, inner to be connected by casting oil duct.
Following beneficial effect can be reached: by the control system of two-stage priority control valve block access tractor after the present invention adopts technique scheme, control fluid by after two-stage priority spool, can reasonable distribution to turning to oil circuit, brake circuit, oil circuit control and output and lifting oil circuit, and prioritizing valve and connection oil circuit are combined, decrease number of spare parts, improve reliability.The present invention is more obvious than ordinary priority valve energy-saving effect, and system architecture is rigorous, careful, simplifies tractor overall structure.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention closes the two-stage priority structure control valve block in heart load feedback hydraulic system.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.As shown in Figure 1, close the two-stage priority structure control valve block in heart load feedback hydraulic system, mainly comprise: pressure-gradient control valve valve body 1, load feedback one-way valve 2, secondary pressure-gradient control valve balance damping 3, secondary priority spool 4, secondary pressure-gradient control valve reset damping 5, secondary pressure-gradient control valve Returnning spring 6, turn to pressure-limit valve 7, one-level pressure-gradient control valve reset damping 8, one-level pressure-gradient control valve Returnning spring 9, one-level priority spool 10, one-level pressure-gradient control valve balance damping 11, one-level pressure-gradient control valve safety check 12; Pressure-gradient control valve valve body 1 inside of integral type is provided with casting cavity and is connected oil duct, fluid accesses pressure-gradient control valve through the access port A of pressure-gradient control valve valve body 1, the associated components one-level pressure-gradient control valve reset damping 8 at one-level priority spool 10 and two ends, left and right thereof, one-level pressure-gradient control valve Returnning spring 9, the damping 11 of one-level pressure-gradient control valve balance, one-level pressure-gradient control valve safety check 12, be arranged in the casting cavity of access port A; The associated components secondary pressure-gradient control valve balance damping 3 at secondary priority spool 4 and two ends, left and right thereof, secondary pressure-gradient control valve reset damping 5, secondary pressure-gradient control valve Returnning spring 6, be arranged in the casting cavity after one-level priority spool 10; Load feedback one-way valve 2 is arranged on feedback hydraulic fluid port B place, turn to pressure-limit valve 7 and one-level pressure-gradient control valve 10 to be installed in parallel and turn to hydraulic fluid port F place, inner connected by casting oil duct, outer installment has access port A, feedback hydraulic fluid port B, control port C, equipment hydraulic fluid port D, external feedback mouth E, turns to hydraulic fluid port F, pressure tap G, oil return inlet T eight connecting ports, valve body can be arranged in power train arbitrary position easily, by other oil circuit of pipe connection system.
Under original state, access port A is without pressure oil, pressure-gradient control valve does not work, one-level priority spool 10 is in initial position under the active force of one-level pressure-gradient control valve Returnning spring 9, secondary priority spool 4 is in initial position under the active force of secondary pressure-gradient control valve Returnning spring 6, access port A, control port C, equipment hydraulic fluid port D, turn to hydraulic fluid port F, pressure tap G, oil return inlet T all without pressure, B is consistent with external feedback mouth E pressure for feedback hydraulic fluid port.
After access port A incoming pressure oil, through one-level priority spool 10, preferential by turning to the outside pressure oil output of hydraulic fluid port F, fluid acts on the two ends of one-level priority spool 10 by the balance damping 11 of one-level pressure-gradient control valve and one-level pressure-gradient control valve reset damping 8 simultaneously, coordinate the active force of one-level pressure-gradient control valve Returnning spring 9, one-level priority spool 10 is jointly made to be in initial priority position, turn to needed for hydraulic fluid port F if the pressure oil now inputted is not enough to provide, then one-level priority spool 10 is failure to actuate, pressure oil all enters and turns to hydraulic fluid port F to meet need of work, now secondary priority spool 4 is in initial position, control port C, equipment hydraulic fluid port D, pressure tap G, oil return inlet T is without pressure, external feedback mouth E and to turn in hydraulic fluid port F pressure ratio comparatively to enter feedback hydraulic fluid port B in great mono-tunnel.
Meeting at pressure oil turns to hydraulic fluid port F to take, pressure oil reaches and turns to pressure-limit valve 7 to limit pressure, work with rear steering pressure-limit valve 7, the oil liquid pressure acting on one-level pressure-gradient control valve balance damping 11 place is greater than the oil liquid pressure acting on one-level pressure-gradient control valve reset damping 8 place, unnecessary fluid enters oil return inlet T, with rear stage priority spool 10 action, fluid turns to after needed for hydraulic fluid port F satisfied, start to enter secondary priority spool 4, now external connection port peripheral feedback port E and to turn in hydraulic fluid port F pressure ratio comparatively to enter feedback hydraulic fluid port B in great mono-tunnel, pressure tap G is consistent with control port C pressure, equipment hydraulic fluid port D is without pressure.
Enter the fluid of secondary priority spool 4, preferential by the outside pressure oil output of control port C, fluid acts on the two ends of secondary priority spool 4 by the balance damping 3 of secondary pressure-gradient control valve and secondary pressure-gradient control valve reset damping 5 simultaneously, coordinate the active force of secondary pressure-gradient control valve Returnning spring 6, secondary priority spool 4 is jointly made to be in initial priority position, if the pressure oil now inputted is not enough to provide needed for control port C, then secondary priority spool 4 is failure to actuate, control port C is all entered to meet work requirements by the pressure oil of secondary priority spool 4, external connection port peripheral feedback port E and to turn in hydraulic fluid port F pressure ratio comparatively to enter feedback hydraulic fluid port B in great mono-tunnel, pressure tap G is consistent with control port C pressure, equipment hydraulic fluid port D is without pressure.
After the force value that the pressure oil at control port C place reaches set by secondary pressure-gradient control valve Returnning spring 6, promote the action of secondary priority spool 4, fluid is meeting after needed for control port C, start to enter equipment hydraulic fluid port D, now external connection port peripheral feedback port E and to turn in hydraulic fluid port F pressure ratio comparatively to enter feedback hydraulic fluid port B in great mono-tunnel, pressure tap G is consistent with control port C pressure.
The invention provides a kind of compact structure, use reliably, with the control valve block of two-stage priority structure, the multiple functional unit part of the load feedback hydraulic system of large tractor can be linked together by a control valve, thus simplify tractor layout, naturally reduce costs simultaneously.
Claims (1)
1. close the two-stage priority structure control valve block in heart load feedback hydraulic system, comprising: pressure-gradient control valve valve body (1), load feedback one-way valve (2), secondary pressure-gradient control valve balance damping (3), secondary priority spool (4), secondary pressure-gradient control valve reset damping (5), secondary pressure-gradient control valve Returnning spring (6), turn to pressure-limit valve (7), one-level pressure-gradient control valve reset damping (8), one-level pressure-gradient control valve Returnning spring (9), one-level priority spool (10), one-level pressure-gradient control valve balance damping (11), one-level pressure-gradient control valve safety check (12); It is characterized in that: pressure-gradient control valve valve body (1) outer installment has access port (A), feedback hydraulic fluid port (B), control port (C), equipment hydraulic fluid port (D), external feedback mouth (E), turns to hydraulic fluid port (F), pressure tap (G), return opening (T); Pressure-gradient control valve valve body (1) inside is provided with casting cavity and is connected oil duct; One-level priority spool (10), one-level pressure-gradient control valve reset damping (8), one-level pressure-gradient control valve Returnning spring (9), one-level pressure-gradient control valve balance damping (11), one-level pressure-gradient control valve safety check 12 are arranged in the casting cavity of access port (A) successively; Secondary priority spool (4), secondary pressure-gradient control valve balance damping (3), secondary pressure-gradient control valve reset damping (5), secondary pressure-gradient control valve Returnning spring (6) are arranged in the casting cavity after one-level priority spool (10) successively; Load feedback one-way valve (2) is arranged on feedback hydraulic fluid port (B) place, external feedback mouth (E) is connected to load feedback one-way valve (2) the other end, turn to pressure-limit valve (7) and one-level pressure-gradient control valve (10) to be installed in parallel and turn to hydraulic fluid port (F) place, all parts by one-level, secondary sequencing in the casting cavity of pressure-gradient control valve valve body (1) in conjunction with as a whole, inner to be connected by casting oil duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510486369.2A CN105179346B (en) | 2015-08-11 | 2015-08-11 | The two-stage priority structure control valve block closed in heart load feedback hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510486369.2A CN105179346B (en) | 2015-08-11 | 2015-08-11 | The two-stage priority structure control valve block closed in heart load feedback hydraulic system |
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| Publication Number | Publication Date |
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| CN105179346A true CN105179346A (en) | 2015-12-23 |
| CN105179346B CN105179346B (en) | 2017-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510486369.2A Active CN105179346B (en) | 2015-08-11 | 2015-08-11 | The two-stage priority structure control valve block closed in heart load feedback hydraulic system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1119691A (en) * | 1994-09-30 | 1996-04-03 | 三星重工业(株) | Variable priority device |
| KR0179572B1 (en) * | 1994-12-28 | 1999-04-15 | 석진철 | Boom priority valve control circuit of excavator |
| CN102167026A (en) * | 2011-04-07 | 2011-08-31 | 北京南车时代机车车辆机械有限公司 | Electric control dual-chamber relay valve |
| CN203051267U (en) * | 2013-01-04 | 2013-07-10 | 第一拖拉机股份有限公司 | Hydraulic system provided with two-stage priority structure and used for tractor |
| CN104040187A (en) * | 2011-10-21 | 2014-09-10 | 卡特彼勒公司 | Closed-loop Hydraulic System Having Priority-based Sharing |
| CN104295551A (en) * | 2014-08-18 | 2015-01-21 | 中国农业大学 | Self-steering proportional control valve block and navigation hydraulic system based on self-steering proportional control valve block |
| CN204985128U (en) * | 2015-08-11 | 2016-01-20 | 第一拖拉机股份有限公司 | Close preferential structure control valve piece of two -stage among heart load feedback hydraulic system |
-
2015
- 2015-08-11 CN CN201510486369.2A patent/CN105179346B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1119691A (en) * | 1994-09-30 | 1996-04-03 | 三星重工业(株) | Variable priority device |
| KR0179572B1 (en) * | 1994-12-28 | 1999-04-15 | 석진철 | Boom priority valve control circuit of excavator |
| CN102167026A (en) * | 2011-04-07 | 2011-08-31 | 北京南车时代机车车辆机械有限公司 | Electric control dual-chamber relay valve |
| CN104040187A (en) * | 2011-10-21 | 2014-09-10 | 卡特彼勒公司 | Closed-loop Hydraulic System Having Priority-based Sharing |
| CN203051267U (en) * | 2013-01-04 | 2013-07-10 | 第一拖拉机股份有限公司 | Hydraulic system provided with two-stage priority structure and used for tractor |
| CN104295551A (en) * | 2014-08-18 | 2015-01-21 | 中国农业大学 | Self-steering proportional control valve block and navigation hydraulic system based on self-steering proportional control valve block |
| CN204985128U (en) * | 2015-08-11 | 2016-01-20 | 第一拖拉机股份有限公司 | Close preferential structure control valve piece of two -stage among heart load feedback hydraulic system |
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| CN105179346B (en) | 2017-09-12 |
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