CN213744206U - Device for improving stability and efficiency of engineering machinery load sensitive hydraulic system - Google Patents
Device for improving stability and efficiency of engineering machinery load sensitive hydraulic system Download PDFInfo
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- CN213744206U CN213744206U CN202022514538.8U CN202022514538U CN213744206U CN 213744206 U CN213744206 U CN 213744206U CN 202022514538 U CN202022514538 U CN 202022514538U CN 213744206 U CN213744206 U CN 213744206U
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Abstract
本实用新型属于工程机械液压系统技术领域，具体涉及一种用于提高工程机械负载敏感液压系统稳定性与效率的装置，包括比例变量柱塞泵、定量泵负载敏感液压系统换向阀前片、油箱、第一负载敏感液压系统换向片、第二负载敏感液压系统换向片、第一液压马达、第二液压马达以及尾片。本实用新型提高了工程机械负载敏感液压系统稳定性，又提高了工程机械负载敏感液压系统效率，满足了工程机械对液压传动系统的需求。
The utility model belongs to the technical field of hydraulic systems of construction machinery, in particular to a device for improving the stability and efficiency of a load-sensitive hydraulic system of construction machinery, comprising a proportional variable plunger pump, a front plate of a reversing valve of a load-sensitive hydraulic system of a quantitative pump, A fuel tank, a first load-sensing hydraulic system reversing piece, a second load-sensing hydraulic system reversing piece, a first hydraulic motor, a second hydraulic motor and a tail piece. The utility model improves the stability of the load-sensitive hydraulic system of the construction machinery, improves the efficiency of the load-sensitive hydraulic system of the construction machinery, and satisfies the requirements of the construction machinery for the hydraulic transmission system.
Description
Technical Field
The utility model belongs to the technical field of engineering machine tool hydraulic system, concretely relates to a device for improving the sensitive hydraulic system stability of engineering machine tool load and efficiency.
Background
Hydraulic transmission is a transmission mode that uses liquid as a working medium to transmit motion and power, and has unique advantages which are not possessed by other transmission modes.
The hydraulic transmission system is widely applied to various fields of national economy, and the hydraulic elements are standardized, serialized and very convenient to use. However, the hydraulic system is usually inefficient in system transmission due to leakage, etc., and the stability of the system is usually affected when the response frequency of the system is required due to the characteristics of the fluid transmission.
In order to improve the transmission efficiency of a hydraulic system of engineering machinery, a load sensitive principle can be adopted for a hydraulic system with a plurality of loads, so that the working pressure of the hydraulic system is changed along with the load, the flow of the hydraulic system is changed along with the change of the load demand, and the loss caused by 'redundant pressure' and 'redundant flow' is reduced, thereby achieving the purpose of improving the transmission efficiency of the hydraulic system, namely the variable pump load sensitive hydraulic system. But the stability of such a system is somewhat poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device for improving the sensitive hydraulic system stability of engineering machine tool load and efficiency to solve the problem that exists among the background art.
In order to achieve the above object, the utility model provides a following technical scheme: a device for improving stability and efficiency of an engineering machinery load-sensitive hydraulic system comprises a proportional variable plunger pump, a front piece of a reversing valve of a constant load-sensitive hydraulic system of a constant delivery pump, an oil tank, a reversing piece of a first load-sensitive hydraulic system, a reversing piece of a second load-sensitive hydraulic system, a first hydraulic motor, a second hydraulic motor and a tail piece, wherein the oil tank is connected with an oil suction port of the proportional variable plunger pump, a high-pressure output port of the proportional variable plunger pump is connected with a P port of the front piece of the reversing valve of the constant delivery pump load-sensitive hydraulic system, a T port of the front piece of the reversing valve of the constant delivery pump load-sensitive hydraulic system is connected with the oil tank, an oil discharge port L of the proportional variable plunger pump is connected with the oil tank, ports A1 and B1 of the reversing piece of the first load-sensitive hydraulic system are respectively connected with an oil inlet and outlet of the first hydraulic motor, an oil discharge port of the first hydraulic motor is connected with the oil tank, and a2 port of the reversing piece of the second load-sensitive hydraulic system is connected with the oil tank, The port B2 is connected with the oil inlet and outlet of the second hydraulic motor, and the oil outlet of the second hydraulic motor is connected with the oil tank.
The utility model has the advantages that: the utility model provides high engineering machine tool load sensitive hydraulic system stability has improved engineering machine tool load sensitive hydraulic system efficiency again, has satisfied engineering machine tool to hydraulic transmission system's demand.
Drawings
FIG. 1 is a hydraulic working schematic diagram of the present invention;
fig. 2 is a schematic view of an embodiment of the present invention;
in the figure: 1. a proportional variable plunger pump; 1.1, variable plunger pump; 1.2, a mechanical variable mechanism; 1.3, a proportional valve; 2. a front piece of a reversing valve of a load-sensitive hydraulic system of a constant delivery pump; 2.1, a three-way flow valve; 2.2, a safety valve; 2.3, a one-way valve; 3. an oil tank; 4. a first load-sensitive hydraulic system commutator segment; 4.1, a first pressure compensator; 4.2, a first proportional reversing valve; 5. a second load-sensitive hydraulic system commutator segment; 5.1, a second pressure compensator; 5.2, a second proportional directional valve; 6. a first hydraulic motor; 7. a second hydraulic motor; 8. and (7) tail pieces.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided in connection with the accompanying drawings.
As shown in fig. 2, an apparatus for improving stability and efficiency of a load sensitive hydraulic system of a construction machine includes: the hydraulic control system comprises a proportional variable plunger pump 1, a constant delivery pump load sensitive hydraulic system reversing valve front piece 2, an oil tank 3, a first load sensitive hydraulic system reversing piece 4, a second load sensitive hydraulic system reversing piece 5, a first hydraulic motor 6, a second hydraulic motor 7 and a tail piece 8. The oil tank 3 is connected with an oil suction port of the proportional variable plunger pump 1, a high-pressure output port of the proportional variable plunger pump 1 is connected with a P port of a front piece 2 of a reversing valve of a load-sensitive hydraulic system of the fixed displacement pump, a T port of the front piece 2 of the reversing valve of the load-sensitive hydraulic system of the fixed displacement pump is connected with the oil tank 3, an oil discharge port L of the proportional variable plunger pump 1 is connected with the oil tank, an A1 and a B1 of a reversing piece 4 of the load-sensitive hydraulic system of the first load-sensitive hydraulic system are connected with an oil inlet and an oil outlet of a first hydraulic motor 6, an oil discharge port of the first hydraulic motor 6 is connected with the oil tank 3, an oil discharge port A2 and a B2 of a reversing piece 5 of the load-sensitive hydraulic system of the second load-sensitive hydraulic system are connected with an oil inlet and an oil outlet of a second hydraulic motor 7, and an oil discharge port of the second hydraulic motor 7 is connected with the oil tank 3.
The working principle of the invention is described in conjunction with fig. 2 as follows:
when the hydraulic system works, the engine drives the proportional variable plunger pump to work, the proportional variable plunger pump supplies oil to the front piece of the reversing valve of the constant displacement pump load sensitive hydraulic system, and the actuating element can work through the reversing piece.
If only the first hydraulic motor 6 is operated, the first proportional directional control valve 4.2 is reversed, the oil supply of the proportional variable displacement piston pump and the opening of the first proportional directional control valve 4.2 are gradually increased until the operating speed of the first hydraulic motor 6 is reached. The system pressure depends on the load size of the first hydraulic motor 6. At the moment, the system supplies oil through the variable pump, no redundant flow returns to the oil tank through the three-way flow valve, the system efficiency is improved compared with the oil supply system of the fixed displacement pump, and the system stability is good because the variable pump is controlled by an electric signal instead of a conventional LS feedback signal.
When the first hydraulic motor 6 works normally, if the second hydraulic motor 7 also starts to work, the oil supply amount of the proportional variable pump and the opening of the second proportional directional valve 5.2 can be continuously and gradually increased until the second hydraulic motor 7 reaches the requirement of the rotating speed. In this process, because of the effect of the first pressure compensator 4.1, the rotational speed of the first hydraulic motor 6 is not affected as long as the opening size of the first variable proportional directional valve 4.2 is not changed.
Simultaneously, first pressure compensator 4.1 and the cooperation of second pressure compensator 5.1 do the selection with the operating pressure of first hydraulic motor 6 and second hydraulic motor 7, and the pressure signal that operating pressure is high feeds back to the anter through the LS mouth, guarantees that hydraulic system's pressure satisfies the hydraulic motor work that operating pressure is higher relatively. The system has high transmission efficiency and normal work and stability.
It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (1)
1. A device for improving stability and efficiency of a load-sensitive hydraulic system of engineering machinery is characterized by comprising a proportional variable plunger pump, a front piece of a reversing valve of a load-sensitive hydraulic system of a constant delivery pump, an oil tank, a reversing piece of a first load-sensitive hydraulic system, a reversing piece of a second load-sensitive hydraulic system, a first hydraulic motor, a second hydraulic motor and a tail piece, wherein the oil tank is connected with an oil suction port of the proportional variable plunger pump, a high-pressure output port of the proportional variable plunger pump is connected with a P port of the front piece of the reversing valve of the load-sensitive hydraulic system of the constant delivery pump, a T port of the front piece of the reversing valve of the load-sensitive hydraulic system of the constant delivery pump is connected with the oil tank, an oil discharge port L of the proportional variable plunger pump is connected with the oil tank, an A1 port and a B1 port of the reversing piece of the first load-sensitive hydraulic system are respectively connected with an oil inlet and outlet of the first hydraulic motor, and the oil discharge port of the first hydraulic motor are connected with the oil tank, the ports A2 and B2 of the commutator bar of the second load-sensitive hydraulic system are connected with the oil inlet and outlet of the second hydraulic motor, and the oil outlet of the second hydraulic motor is connected with the oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022514538.8U CN213744206U (en) | 2020-11-04 | 2020-11-04 | Device for improving stability and efficiency of engineering machinery load sensitive hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022514538.8U CN213744206U (en) | 2020-11-04 | 2020-11-04 | Device for improving stability and efficiency of engineering machinery load sensitive hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213744206U true CN213744206U (en) | 2021-07-20 |
Family
ID=76819302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022514538.8U Expired - Fee Related CN213744206U (en) | 2020-11-04 | 2020-11-04 | Device for improving stability and efficiency of engineering machinery load sensitive hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213744206U (en) |
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2020
- 2020-11-04 CN CN202022514538.8U patent/CN213744206U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210720 |
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| CF01 | Termination of patent right due to non-payment of annual fee |