CN105179346B - The two-stage priority structure control valve block closed in heart load feedback hydraulic system - Google Patents
The two-stage priority structure control valve block closed in heart load feedback hydraulic system Download PDFInfo
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- CN105179346B CN105179346B CN201510486369.2A CN201510486369A CN105179346B CN 105179346 B CN105179346 B CN 105179346B CN 201510486369 A CN201510486369 A CN 201510486369A CN 105179346 B CN105179346 B CN 105179346B
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Abstract
The two-stage priority structure control valve block closed in heart load feedback hydraulic system, including：Preferentially valve body, load feedback check valve, two grades of pressure-gradient control valves balance dampings, two grades of priority spools, two grades of pressure-gradient control valves reset damping, two grades of pressure-gradient control valve back-moving springs, steering pressure limiting valve, one-level pressure-gradient control valves and reset damping, the damping of one-level pressure-gradient control valve back-moving spring, one-level priority spool, one-level pressure-gradient control valve balance, one-level pressure-gradient control valve check-valves；Pressure-gradient control valve valve inner is provided with casting cavity and connection oil duct, and one-level priority spool, one-level pressure-gradient control valve reset damping, one-level pressure-gradient control valve back-moving spring, one-level pressure-gradient control valve balance are damped, one-level pressure-gradient control valve check-valves is sequentially arranged in casting cavity；Two grades of priority spools, two grades of dampings of pressure-gradient control valve balance, two grades of pressure-gradient control valves reset damping, two grades of pressure-gradient control valve back-moving springs and are sequentially arranged in casting cavity；All parts are integrated into a whole by one-level, two grades of sequencings in the casting cavity of preferential valve body, internal to be connected by casting oil duct.
Description
Technical field
The invention belongs to tractor field, it is related to a kind of wheeled tractor hydraulic system, more particularly to one kind closes heart load
Two-stage priority structure control valve block in feedback hydraulic system.
Background technology
At present, on the various model large power wheel tractors produced at home, high-grade tractor hydraulic system is adopted
Heart load feedback system is closed with variable pump band.It is such to close in heart load feedback system, comprising：Knuckle section, brake portion, clutch
Device control section, lift portion and banked direction control valves output par, c.The pressure of each several part can be wherein balanced with pressure-gradient control valve.It is existing excellent
First valve is generally single-stage priority acccess control, it is necessary to which multiple single-stage pressure-gradient control valves are carried out during integrated more module section in hydraulic system
Hydraulic oil distribution control between disparate modules part, supporting multiple single-stage pressure-gradient control valves also need to accordingly increase pipeline connection,
Great inconvenience is brought to design and installation arrangement.Therefore it provides a kind of reliable and stable two-stage priority structure control valve block,
Simplify on the basis of tractor arrangement, the stability of hydraulic system can also be improved, this exactly tractor design, production
Required.
The content of the invention
The invention provides a kind of reliable and stable two-stage priority structure control valve block, it can only be put down with a pressure-gradient control valve block
Weighing apparatus closes the pressure of a plurality of oil circuit in heart load feedback system, so that a variety of pressure with oily demand are put down for reliable and stable ensure that
Weighing apparatus, is allocated for closing different piece in heart load feedback system with the priority and pressure rating of oil, while simplifying liquid
Press system design and mounting arrangements structure.
The present invention can reach above-mentioned purpose by the following technical programs：The two-stage closed in heart load feedback hydraulic system is excellent
First structure control valve block, including：Preferential valve body, load feedback check valve, two grades of dampings of pressure-gradient control valve balance, two grades of pressure-gradient control valves
Core, two grades of pressure-gradient control valves reset dampings, two grades of pressure-gradient control valve back-moving springs, steering pressure limiting valve, one-level pressure-gradient control valves reset damping, one-levels are excellent
First valve back-moving spring, one-level priority spool, the damping of one-level pressure-gradient control valve balance, one-level pressure-gradient control valve check-valves；Outside preferential valve body
It is provided with access port, feedback hydraulic fluid port, control port, equipment hydraulic fluid port, external feedback mouthful, steering hydraulic fluid port, pressure tap, oil return opening
Eight connectivity ports；Pressure-gradient control valve valve inner is provided with casting cavity and connection oil duct, and one-level priority spool, one-level pressure-gradient control valve reset
Damping, the damping of one-level pressure-gradient control valve back-moving spring, one-level pressure-gradient control valve balance, one-level pressure-gradient control valve check-valves are sequentially arranged at access port
In casting cavity；Two grades of priority spools, two grades of pressure-gradient control valve balance dampings, two grades of pressure-gradient control valves reset damping, two grades of pressure-gradient control valves and reset bullet
Spring is sequentially arranged in the casting cavity after one-level priority spool；Load feedback check valve is arranged on feedback oil port, external feedback
Mouth is connected to the load feedback check valve other end, turns to pressure limiting valve and is installed in parallel with one-level pressure-gradient control valve in steering oil port,
All parts are integrated into a whole by one-level, two grades of sequencings in the casting cavity of preferential valve body, internal to pass through casting
Oil duct is connected.
The present invention can reach following beneficial effect after using above-mentioned technical proposal：The access of two-stage priority control valve block is dragged
The control system of machine drawing, after control fluid is by two-stage priority spool, can reasonable distribution to turning to oil circuit, brake circuit, control
Oil circuit and output and lifting oil circuit, and prioritizing valve and connection oil circuit are combined, number of parts is reduced, is improved
Reliability.The present invention is more obvious than ordinary priority valve energy-saving effect, and system architecture is rigorous, careful, simplifies tractor and integrally ties
Structure.
Brief description of the drawings
The structural representation for the two-stage priority structure control valve block that Fig. 1 is closed in heart load feedback hydraulic system for the present invention.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings.As shown in figure 1, closing in heart load feedback hydraulic system
Two-stage priority structure control valve block, mainly includes：Preferential valve body 1, load feedback check valve 2, two grades of pressure-gradient control valve balance dampings
3rd, two grades of priority spools 4, two grades of pressure-gradient control valves reset dampings 5, two grades of pressure-gradient control valve back-moving springs 6, steering pressure limiting valve 7, one-levels are preferential
Valve reset damping 8, one-level pressure-gradient control valve back-moving spring 9, one-level priority spool 10, one-level pressure-gradient control valve balance damping 11, one-level are preferential
Valve check-valves 12；The preferential valve body 1 of integral type is internally provided with casting cavity and connection oil duct, and fluid passes through preferential valve body 1
Access port A access pressure-gradient control valves, the associated components one-level pressure-gradient control valves of one-level priority spool 10 and its left and right ends reset damping 8,
One-level pressure-gradient control valve back-moving spring 9, one-level pressure-gradient control valve balance damping 11, one-level pressure-gradient control valve check-valves 12, installed in access port A casting
Make intracavitary；The two grades of pressure-gradient control valve balance dampings 3 of two grades of priority spools 4 and its associated components of left and right ends, two grades of pressure-gradient control valves reset
Damping 5, two grades of pressure-gradient control valve back-moving springs 6, are arranged in the casting cavity after one-level priority spool 10；Load feedback check valve 2 is pacified
At feedback hydraulic fluid port B, turn to pressure limiting valve 7 and be installed in parallel with one-level pressure-gradient control valve 10 at steering hydraulic fluid port F, it is internal to pass through casting
Make oil duct to be connected, outside is provided with access port A, feeds back hydraulic fluid port B, control port C, equipment hydraulic fluid port D, external feedback mouthful E, turns
To hydraulic fluid port F, pressure tap G, eight connectivity ports of oil return inlet T, valve body can easily be arranged in power train optional position, pass through pipe
Road connects other oil circuits of system.
Under original state, access port A no pressures oil, pressure-gradient control valve does not work, and one-level priority spool 10 is multiple in one-level pressure-gradient control valve
Initial position is under the active force of position spring 9, two grades of priority spools 4 are located under the active force of two grades of pressure-gradient control valve back-moving springs 6
In initial position, access port A, control port C, equipment hydraulic fluid port D, hydraulic fluid port F, pressure tap G, the equal no pressure of oil return inlet T are turned to,
Feed back hydraulic fluid port B consistent with external feedback mouthful E pressure.
After access port A input pressures oil, by one-level priority spool 10, preferentially by turning to the outside output pressures of hydraulic fluid port F
Oil, while fluid resets damping 8 by one-level pressure-gradient control valve balance damping 11 and one-level pressure-gradient control valve acts on one-level priority spool 10
Two ends, coordinate the active force of one-level pressure-gradient control valve back-moving spring 9, one-level priority spool 10 is in initial priority position jointly,
If the pressure oil now inputted is not enough to needed for offer steering hydraulic fluid port F, one-level priority spool 10 is failure to actuate, and pressure oil all enters
Enter to turn to hydraulic fluid port F to meet need of work, now two grades of priority spools 4 are in initial position, control port C, equipment oil
Oil is fed back in larger the entering all the way of pressure ratio in mouth D, pressure tap G, oil return inlet T no pressure, external feedback mouthful E and steering hydraulic fluid port F
Mouth B.
Steering hydraulic fluid port F is met in pressure oil to be taken, pressure oil reaches that steering pressure limiting valve 7 limits pressure, is subsequently diverted to limit
Pressure valve 7 works, and the oil liquid pressure acted at one-level pressure-gradient control valve balance damping 11, which is more than, acts on one-level pressure-gradient control valve reset damping 8
The oil liquid pressure at place, unnecessary fluid enters oil return inlet T, is acted with rear stage priority spool 10, and fluid is meeting steering hydraulic fluid port F institutes
After needing, initially enter two grades of priority spools 4, now in external connection port outside feedback port E and turn in hydraulic fluid port F pressure ratio compared with
Hydraulic fluid port B is fed back in big entering all the way, and pressure tap G is consistent with control port C pressure, equipment hydraulic fluid port D no pressures.
Into the fluid of two grades of priority spools 4, preferentially by the outside pressure oil outputs of control port C, while fluid passes through
Two grades of pressure-gradient control valve balance dampings 3 and two grades of pressure-gradient control valves reset the two ends that damping 5 acts on two grades of priority spools 4, and two grades of cooperation is excellent
The active force of first valve back-moving spring 6, makes two grades of priority spools 4 be in initial priority position, if the pressure oil now inputted jointly
It is not enough to needed for offer control port C, then two grades of priority spools 4 are failure to actuate, and are all entered by the pressure oil of two grades of priority spools 4
Entering control port C, pressure ratio is larger in outside feedback port E and steering hydraulic fluid port F to meet in work requirements, external connection port
Enter feedback hydraulic fluid port B, pressure tap G all the way consistent with control port C pressure, equipment hydraulic fluid port D no pressures.
Pressure oil at control port C is reached after the pressure value set by two grades of pressure-gradient control valve back-moving springs 6, promotes two grades
Priority spool 4 is acted, and fluid initially enters equipment hydraulic fluid port D, now external connection terminal after needed for meeting control port C
Hydraulic fluid port B, pressure tap G and control port C are fed back in larger the entering all the way of pressure ratio in outside feedback port E and steering hydraulic fluid port F in mouth
Pressure is consistent.
The invention provides a kind of compact conformation, use reliable, the control valve block with two-stage priority structure so that large-scale
The multiple functional unit parts of load feedback hydraulic system of tractor can be linked together by a control valve, so as to simplify
Tractor arrangement, while reduce cost naturally.
Claims (1)
1. the two-stage priority structure control valve block closed in heart load feedback hydraulic system, including：Preferential valve body（1）, load it is anti-
Present check valve（2）, two grades of pressure-gradient control valve balance dampings（3）, two grades of priority spools（4）, two grades of pressure-gradient control valves reset damping（5）, two grades
Pressure-gradient control valve back-moving spring（6）, turn to pressure limiting valve（7）, one-level pressure-gradient control valve reset damping（8）, one-level pressure-gradient control valve back-moving spring（9）、
One-level priority spool（10）, one-level pressure-gradient control valve balance damping（11）, one-level pressure-gradient control valve check-valves（12）；It is characterized in that：Preferentially
Valve body（1）Outside is provided with access port（A）, feedback hydraulic fluid port（B）, control port（C）, equipment hydraulic fluid port（D）, external feedback
Mouthful（E）, turn to hydraulic fluid port（F）, pressure tap（G）, oil return opening（T）；Preferential valve body（1）It is internally provided with casting cavity and connection oil
Road；One-level priority spool（10）, one-level pressure-gradient control valve reset damping（8）, one-level pressure-gradient control valve back-moving spring（9）, one-level pressure-gradient control valve put down
Weighing apparatus damping（11）, one-level pressure-gradient control valve check-valves 12 be sequentially arranged at access port（A）Casting cavity in；Two grades of priority spools（4）, two
Level pressure-gradient control valve balance damping（3）, two grades of pressure-gradient control valves reset damping（5）, two grades of pressure-gradient control valve back-moving springs（6）It is sequentially arranged in one-level
Priority spool（10）In casting cavity afterwards；Load feedback check valve（2）Installed in feedback hydraulic fluid port（B）Place, external feedback mouthful（E）Even
It is connected on load feedback check valve（2）The other end, turns to pressure limiting valve（7）With one-level pressure-gradient control valve（10）It is installed in parallel and is turning to steering oil
Mouthful（F）Place, all parts are by one-level, two grades of sequencings in preferential valve body（1）Casting cavity in be integrated into a whole, it is interior
Portion is 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105179346A CN105179346A (en) | 2015-12-23 |
| CN105179346B true CN105179346B (en) | 2017-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
Country Status (1)
| Country | Link |
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| CN (1) | CN105179346B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100226281B1 (en) * | 1994-09-30 | 1999-10-15 | 토니헬샴 | Variable priority device |
| KR0179572B1 (en) * | 1994-12-28 | 1999-04-15 | 석진철 | Boom priority valve control circuit of excavator |
| CN102167026B (en) * | 2011-04-07 | 2013-01-09 | 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 |
| CN104295551B (en) * | 2014-08-18 | 2016-03-23 | 中国农业大学 | A kind of auto-steering proportional control valve block and the navigation hydraulic system based on this 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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2015
- 2015-08-11 CN CN201510486369.2A patent/CN105179346B/en active Active
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| Publication number | Publication date |
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| CN105179346A (en) | 2015-12-23 |
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