CN204716649U - A kind of Hills mini tractor test stand hydraulic system - Google Patents
A kind of Hills mini tractor test stand hydraulic system Download PDFInfo
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- CN204716649U CN204716649U CN201520412923.8U CN201520412923U CN204716649U CN 204716649 U CN204716649 U CN 204716649U CN 201520412923 U CN201520412923 U CN 201520412923U CN 204716649 U CN204716649 U CN 204716649U
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Abstract
The utility model discloses a kind of Hills mini tractor test stand hydraulic system, be connected with constant pressure variable plunger pump (4) by coupling (3) by motor (2), the filler opening of constant pressure variable plunger pump (4) is communicated with fuel tank (1), and oil outlet connects high pressure filter (6) and electromagnetic relief valve (7) respectively by one-way valve (5).Four identical hydraulic branch, each hydraulic branch comprises proportional reversing valve (10), quick release coupling (11), equilibrium valve (12), hydraulic lock (13), oil hydraulic cylinder (14), each oil hydraulic cylinder is provided with displacement transducer (15); Whole hydraulic system is by computer system control.The utility model is a kind of four cylinder synchronization hydraulic systems, for solving Hills mini tractor when hillside fields makes a service test, this hydraulic system can carry out elevating control to experiment porch, and can ensure that test platform remains at the gradient of requirement when tractor test.
Description
Technical field
The utility model belongs to technical field of hydraulic pressure, relates to a kind of Hills mini tractor test stand hydraulic system.
Background technique
The development miniature farm mechanization in Hills is national development Major Strategic Demand.Because China's alpine terrain is complicated, road surface is narrow, the gradient is steep, road bumpiness is difficult to walk, and the current difficulty of big-and-middle-sized farm machinery, the Work machine that design and research and development are applicable to Hills is extremely urgent.
For mini tractor hillside fields, Forecast and evaluation Hills vehicle dynamics performance, improve traction property, stability and turning to property when hilly and mountainous land mini tractor works in hillside fields, and for improve structure knot and motion control theoretical foundation is provided, need to test desired parameters and test.But at present, the miniature Work machine travel performance test in Hills, climbing ability test, turning test and obstacle detouring test etc. all need larger test site, and allow the performance test that will realize any gradient within the scope of the gradient of traveling more difficult at tested vehicle.Due to the above defect of current Hills mini tractor test conditions, need to design a kind of new Hills mini tractor test stand.
Model utility content
The purpose of this utility model is to provide a kind of structural stability reliable, rational Hills mini tractor test stand hydraulic system, this hydraulic system can the inclination angle of Control experiment platform, for Hills mini tractor provides the test conditions in design and R&D process.
For achieving the above object, the utility model have employed following technological scheme: provide a kind of Hills mini tractor test stand hydraulic system, it comprises fuel tank, motor, coupling, constant pressure variable plunger pump, one-way valve, high pressure filter, electromagnetic relief valve, return oil filter, four identical hydraulic branch; Each hydraulic branch comprises proportional reversing valve, quick release coupling, equilibrium valve, hydraulic lock, oil hydraulic cylinder; Proportional reversing valve is 3-position 4-way electro-hydraulic proportion reversing valve, and the proportional reversing valve of each hydraulic branch is arranged on integrated package.Described motor is connected with constant pressure variable plunger pump by coupling; The filler opening of constant pressure variable plunger pump is communicated with fuel tank, and oil outlet connects the filler opening of one-way valve; The outlet of one-way valve connects filler opening and the electromagnetic relief valve filler opening of high pressure filter respectively; The outlet of high pressure filter connects integrated package P mouth; In described each hydraulic branch, proportional reversing valve P1 mouth and T1 mouth are connected with T mouth with integrated package P mouth respectively, A1 mouth connects the filler opening of equilibrium valve by quick release coupling, B1 mouth connects the B2 mouth of hydraulic lock by quick release coupling, the A2 hydraulic fluid port of hydraulic lock connects the oil outlet of equilibrium valve, A3 hydraulic fluid port and B3 hydraulic fluid port connect oil hydraulic cylinder rodless cavity and rod chamber respectively, a composition hydraulic pressure cylinder assembly on the oil hydraulic cylinder that equilibrium valve and hydraulic lock are integrated in place branch road; One end of return oil filter is communicated with integrated package T mouth with the oil outlet of electromagnetic relief valve, and the other end is connected with fuel tank.
Between described one-way valve and high pressure filter, side connects shock-proof pressure gauge; Each oil hydraulic cylinder is provided with displacement transducer; Each proportional reversing valve B mouth place is provided with pressure transducer; Each proportional reversing valve, pressure transducer, displacement transducer are by computer system control.
The utility model is owing to taking above technological scheme, it has the following advantages: 1, by the displacement amount Real-time Feedback of displacement transducer to four oil hydraulic cylinders, computer control proportional reversing valve adjusts it, and ensure four hydraulic cylinder synchronous liftings, the net synchronization capability of system is good.2, each oil hydraulic cylinder being provided with hydraulic lock and equilibrium valve, test platform can be made to remain on the gradient of setting for a long time, preventing test platform in process of the test from falling because conducting oneself with dignity, and test stand stable movement in lifting process.
In sum, the utility model is a kind of four cylinder synchronization hydraulic systems, and four oil hydraulic cylinders support test platform, for solving Hills mini tractor when hillside fields makes a service test, this hydraulic system can complete the elevating control to test platform, achieves different gradient.
Accompanying drawing explanation
A kind of Hills mini tractor test stand hydraulic system principle figure that Fig. 1 provides for the utility model;
Fig. 2 is the structural representation of the utility model Hills mini tractor test stand;
Description of reference numerals:
1. fuel tank 2. motor 3. coupling 4. constant pressure variable plunger pump
5. one-way valve 6. high pressure filter 7. electromagnetic relief valve 8. return oil filter
9. integrated package 10. proportional reversing valve 11. quick release coupling 12. equilibrium valve
13. hydraulic lock 14. oil hydraulic cylinder 15. displacement transducer 16. shock-proof pressure gauges
17. pressure transducer 18. test platforms
Embodiment
Be described in detail to specific embodiment of the utility model below in conjunction with accompanying drawing, should be understood that, specific embodiment described herein only for instruction and explanation of the utility model, and is not used in restriction the utility model.
As shown in Figure 1 and Figure 2, this Hills mini tractor test stand hydraulic system comprises fuel tank (1), motor (2), coupling (3), constant pressure variable plunger pump (4), one-way valve (5), high pressure filter (6), electromagnetic relief valve (7), return oil filter (8), four identical hydraulic branch, each hydraulic branch comprises proportional reversing valve (10), quick release coupling (11), equilibrium valve (12), hydraulic lock (13), oil hydraulic cylinder (14); Proportional reversing valve (10) is 3-position 4-way electro-hydraulic proportion reversing valve, and the proportional reversing valve of each hydraulic branch is arranged on integrated package (9); The load of oil hydraulic cylinder is test platform (18).Motor (2) is connected with constant pressure variable plunger pump (4) by coupling (3), the filler opening of constant pressure variable plunger pump (4) is communicated with fuel tank (1), and oil outlet connects the filler opening of one-way valve (5), the outlet of one-way valve (5) connects filler opening and electromagnetic relief valve (7) filler opening of high pressure filter (6) respectively, the outlet of high pressure filter (6) connects integrated package (9) P mouth, in each hydraulic branch, proportional reversing valve (10) P1 mouth and T1 mouth are connected with T mouth with integrated package (9) P mouth respectively, A1 mouth connects the filler opening of equilibrium valve (12) by quick release coupling (11), B1 mouth connects the B2 hydraulic fluid port of hydraulic lock (13) by quick release coupling (11), the A2 hydraulic fluid port of hydraulic lock (13) connects the oil outlet of equilibrium valve (12), A3 hydraulic fluid port and B3 hydraulic fluid port connect oil hydraulic cylinder (14) rodless cavity and rod chamber respectively, equilibrium valve (12) and hydraulic lock (13) are integrated in upper composition hydraulic pressure cylinder assembly of oil hydraulic cylinder (14) of place branch road, one end of return oil filter (8) is communicated with integrated package (9) T mouth with the oil outlet of electromagnetic relief valve (7), and the other end is connected with fuel tank (1).
Between one-way valve (5) and high pressure filter (6), side connects shock-proof pressure gauge (16); Each oil hydraulic cylinder is provided with displacement transducer (15); Each proportional reversing valve (10) B1 mouth place is provided with pressure transducer (17); Each described proportional reversing valve, displacement transducer, pressure transducer are by computer system control.
The working principle of the Hills mini tractor test stand hydraulic system that the present embodiment provides is as follows:
First according to Hills mini tractor test requirements document, the computer controlling this hydraulic system sets the value of slope that test platform (18) will reach.Motor (2) drives constant pressure variable plunger pump (4) running, hydraulic oil is by constant pressure variable plunger pump (4) sucking-off in ramming system, high-pressure oil flow enters integrated package (9) P mouth to each hydraulic branch fuel feeding after one-way valve (5), high pressure filter (6) from fuel tank (1).Four identical hydraulic branch are started working simultaneously, in each hydraulic branch, high pressure oil is through the P1 hydraulic fluid port of integrated package (9) P mouth access proportional reversing valve (10), now, the right electromagnet S3 of proportional reversing valve (10) obtains and electricly spool is opened and is operated in right position, its P1 mouth and A1 mouth are connected, T1 mouth and B1 mouth are connected, high pressure oil flows through P1 mouth and the A1 mouth of proportional reversing valve (10) successively, the one-way valve that equilibrium valve (12) is inner, the rodless cavity of oil hydraulic cylinder (14) is entered into after the A2 mouth of hydraulic lock (13) and A3 mouth, piston rod is lifting test platform (18) upwards, fluid in oil hydraulic cylinder (14) rod chamber passes through B3 mouth and the B2 mouth of hydraulic lock (13), B1 and the T1 mouth of proportional reversing valve (10) is to integrated package (9) T mouth, fuel tank is flowed back to finally by return oil filter (8).In each hydraulic branch working procedure, the displacement transducer that oil hydraulic cylinder is installed detects the displacement amount of each cylinder in time, if the displacement transducer checkout value of the oil hydraulic cylinder of one of them hydraulic branch and setting value have deviation, the corresponding proportional reversing valve spool of now computer control moves, the stroke of cylinder pressure is finely tuned, to ensure the synchronism of four oil hydraulic cylinders in jacking test platform (18) uphill process.
After test platform (18) reaches the gradient of setting, the proportional reversing valve commutation of each hydraulic branch makes spool be in meta, high-pressure oil flow ends to during proportional reversing valve P1 mouth, system pressure raises, once whole hydraulic system pressure reaches the pressure that constant pressure variable plunger pump (4) sets, constant pressure variable plunger pump (4) can change swashplate angle automatically, and flow vanishing, doing so avoids spill losses.Oil hydraulic cylinder can be in static locking state for a long time under two one-way valve effects of hydraulic lock.In process of the test, the impact of the condition that is put to the test, the load of bearing when the oil hydraulic cylinder in certain hydraulic branch changes suddenly, load increases or reduces, and now deviation appears in displacement transducer checkout value and setting value, and computer moves according to deviate control ratio change-over valve core, to the oil hydraulic cylinder fine setting occurring deviation, when deviate is within setting value, the spool of proportional reversing valve returns meta again, and proof test platform (18) remains at the gradient of requirement.
After completing test, the left electromagnet S2 of the proportional reversing valve of each hydraulic branch obtains electric and is operated in left position, its P1 mouth and B1 mouth are connected, T1 mouth and A1 mouth are connected, the B2 mouth of pressure oil through hydraulic lock and the rod chamber of B3 mouth inflow oil hydraulic cylinder, driven plunger moves downward, oil return from the rodless cavity of oil hydraulic cylinder through the A3 mouth of hydraulic lock and A2 mouth, equilibrium valve, proportional reversing valve A1 mouth and T1 mouth to integrated package (9) T mouth, flow back to fuel tank (1) finally by return oil filter (8).In decline process, equilibrium valve can effectively prevent from occurring hypervelocity phenomenon in decline.After test stand sets back, complete test battery platform lifting action.
Electromagnetic relief valve (7) initialization system safe-working pressure; if constant pressure variable plunger pump (4) fuel feeding is far longer than the pressure required for system; then high pressure oil is got back in fuel tank (1) through return oil filter (8) after electromagnetic relief valve (7) overflow; protective system safety; the actual working pressure of pressure gauge display system, is convenient to manual monitoring.
As shown in the above, a kind of Hills mini tractor test stand hydraulic system that the utility model embodiment provides, it, with 3-position 4-way proportional reversing valve and constant pressure variable plunger pump combination, at each oil hydraulic cylinder installation position displacement sensor, ensures multi-cylinder synchronous performance within the specific limits.Four oil hydraulic cylinders support test platform, and for solving Hills mini tractor when hillside fields makes a service test, this hydraulic system can complete the elevating control to test platform, achieves different gradient.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, all do on the utility model spirit with principle any amendment, to replace and improvement etc. on an equal basis, all should be included within protection domain of the present utility model.
Claims (1)
1. a Hills mini tractor test stand hydraulic system, comprise fuel tank (1), motor (2), coupling (3), constant pressure variable plunger pump (4), one-way valve (5), high pressure filter (6), electromagnetic relief valve (7), return oil filter (8), four identical hydraulic branch, each hydraulic branch comprises proportional reversing valve (10), quick release coupling (11), equilibrium valve (12), hydraulic lock (13), oil hydraulic cylinder (14); Proportional reversing valve (10) is 3-position 4-way electro-hydraulic proportion reversing valve, and the proportional reversing valve of each hydraulic branch is arranged on integrated package (9); The load of oil hydraulic cylinder is test platform (18);
Described motor (2) is connected with constant pressure variable plunger pump (4) by coupling (3), the filler opening of constant pressure variable plunger pump (4) is communicated with fuel tank (1), and oil outlet connects the filler opening of one-way valve (5), the outlet of one-way valve (5) connects filler opening and electromagnetic relief valve (7) filler opening of high pressure filter (6) respectively, the outlet of high pressure filter (6) connects integrated package (9) P mouth, in each hydraulic branch, proportional reversing valve (10) P1 mouth and T1 mouth are connected with T mouth with integrated package (9) P mouth respectively, A1 mouth connects the filler opening of equilibrium valve (12) by quick release coupling (11), B1 mouth connects the B2 hydraulic fluid port of hydraulic lock (13) by quick release coupling (11), the A2 hydraulic fluid port of hydraulic lock (13) connects the oil outlet of equilibrium valve (12), A3 hydraulic fluid port and B3 hydraulic fluid port connect oil hydraulic cylinder (14) rodless cavity and rod chamber respectively, equilibrium valve (12) and hydraulic lock (13) are integrated in upper composition hydraulic pressure cylinder assembly of oil hydraulic cylinder (14) of place branch road, one end of return oil filter (8) is communicated with integrated package (9) T mouth with the oil outlet of electromagnetic relief valve (7), and the other end is connected with fuel tank (1),
Between one-way valve (5) and high pressure filter (6), side connects shock-proof pressure gauge (16); Each oil hydraulic cylinder is provided with displacement transducer (15); Each proportional reversing valve (10) B1 mouth place is provided with pressure transducer (17); Each described proportional reversing valve, displacement transducer, pressure transducer are by computer system control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520412923.8U CN204716649U (en) | 2015-06-10 | 2015-06-10 | A kind of Hills mini tractor test stand hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520412923.8U CN204716649U (en) | 2015-06-10 | 2015-06-10 | A kind of Hills mini tractor test stand hydraulic system |
Publications (1)
| Publication Number | Publication Date |
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| CN204716649U true CN204716649U (en) | 2015-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520412923.8U Expired - Fee Related CN204716649U (en) | 2015-06-10 | 2015-06-10 | A kind of Hills mini tractor test stand hydraulic system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929998A (en) * | 2015-06-10 | 2015-09-23 | 西北农林科技大学 | Hydraulic system for test bed of mini-type tractor in hilly mountain area |
| CN106717216A (en) * | 2016-11-30 | 2017-05-31 | 广西壮族自治区都安瑶族自治县科学技术情报研究所 | A kind of farm tractor for being capable of temperature sensor |
| CN107023533A (en) * | 2017-06-22 | 2017-08-08 | 合肥工业大学 | A kind of hydraulic control system for resilient bearing multidimensional rigidity test |
| CN111075783A (en) * | 2019-12-20 | 2020-04-28 | 四川川润液压润滑设备有限公司 | Multi-group oil cylinder variable speed synchronous control system and method |
-
2015
- 2015-06-10 CN CN201520412923.8U patent/CN204716649U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929998A (en) * | 2015-06-10 | 2015-09-23 | 西北农林科技大学 | Hydraulic system for test bed of mini-type tractor in hilly mountain area |
| CN106717216A (en) * | 2016-11-30 | 2017-05-31 | 广西壮族自治区都安瑶族自治县科学技术情报研究所 | A kind of farm tractor for being capable of temperature sensor |
| CN107023533A (en) * | 2017-06-22 | 2017-08-08 | 合肥工业大学 | A kind of hydraulic control system for resilient bearing multidimensional rigidity test |
| CN107023533B (en) * | 2017-06-22 | 2018-03-16 | 合肥工业大学 | A kind of hydraulic control system for resilient bearing multidimensional rigidity test |
| CN111075783A (en) * | 2019-12-20 | 2020-04-28 | 四川川润液压润滑设备有限公司 | Multi-group oil cylinder variable speed synchronous control system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20170610 |