阅读说明：本技术 一种挖掘机液压控制系统及方法 (A kind of excavator hydraulic control system and method ) 是由 陆建伟 姚霆 陈虎 于 2019-09-18 设计创作，主要内容包括：一种挖掘机液压控制系统及方法,涉及挖掘机液压控制技术领域,包括LUDV负载敏感阀、控制单元、预设数量的齿轮泵以及与齿轮泵一一对应的二位三通电控阀；所述二位三通电控阀的进油口与与之对应的齿轮泵的出油口连接,所述二位三通电控阀的两个出油口分别连接至LUDV负载敏感阀的进油口和系统回油油路,每个二位三通电控阀分别与控制单元连接,LUDV负载敏感阀的LS孔连接有压力传感器,所述压力传感器与控制单元连接,所述控制单元分三个阶段对二位三通电控阀进行控制,这种挖掘机液压控制系统及方法在不同压力下具有不同的流量从而解决了传统挖掘机液压控制系统和方法中溢流阀溢流而损失能量的问题。(A kind of excavator hydraulic control system and method, are related to excavator technical field of hydraulic, including LUDV load-sensitive valve, control unit, preset quantity gear pump and with the one-to-one two-position three way electrically-controlled valve of gear pump；The oil inlet of the two-position three way electrically-controlled valve is connect with the oil outlet of corresponding gear pump, two oil outlets of the two-position three way electrically-controlled valve are respectively connected to the oil inlet and system oil return oil circuit of LUDV load-sensitive valve, each two-position three way electrically-controlled valve is connect with control unit respectively, the hole LS of LUDV load-sensitive valve is connected with pressure sensor, the pressure sensor is connect with control unit, described control unit divides three phases to control two-position three way electrically-controlled valve, this excavator hydraulic control system and method have different flows to solve the problems, such as overflow valve overflow in conventional excavators hydraulic control system and method and off-energy at various pressures.)

1. a kind of excavator hydraulic control system, characterized in that including LUDV load-sensitive valve, control unit, preset quantity Gear pump and with the one-to-one two-position three way electrically-controlled valve of gear pump；The oil inlet of the two-position three way electrically-controlled valve with it is right therewith The oil outlet for the gear pump answered connects, and two oil outlets of the two-position three way electrically-controlled valve are respectively connected to LUDV load-sensitive valve Oil inlet and system oil return oil circuit, each two-position three way electrically-controlled valve connect with control unit respectively, LUDV load-sensitive valve The hole LS is connected with pressure sensor, and the pressure sensor is connect with control unit, described control unit its divide three phases pair Two-position three way electrically-controlled valve is controlled:

Stage I, before hydraulic system work initially reaches system release pressure to pressure sensor detection pressure, control unit control The oil circuit of all two-position three way electrically-controlled valve connection LUDV load-sensitive valves is open-minded, and the oil circuit of connection system oil return oil circuit is closed；

Stage II, pressure sensor detection pressure reach after release pressure to before reaching system maximum pressure, control unit control Single two-position three way electrically-controlled valve or the combination of part two-position three way electrically-controlled valve open the oil circuit of connection LUDV load-sensitive valve to be adapted to Current pressure sensor detects pressure；

In the stage III, after hydraulic system pressure reaches system maximum pressure, control unit controls all two-position three ways in hydraulic system The oil circuit that electrically-controlled valve connects LUDV load-sensitive valve is closed, and the oil circuit for connecting system oil return oil circuit is open-minded.

2. a kind of excavator hydraulic control system according to claim 1, which is characterized in that described control unit is automatically controlled Plate.

3. a kind of excavator hydraulic control system according to claim 1, which is characterized in that the gear pump includes gear Pump A, gear pump B, gear pump C, gear pump D and gear pump E, the two-position three way electrically-controlled valve include respectively with gear pump A, tooth Wheel pump B, gear pump C, gear pump D and the one-to-one two-position three way electrically-controlled valve A of gear pump E, two-position three way electrically-controlled valve B, two Position threeway electrically-controlled valve C, two-position three way electrically-controlled valve D and two-position three way electrically-controlled valve E, the work of the two-position three way electrically-controlled valve in the stage II Include: as mode

Only the oil circuit of two-position three way electrically-controlled valve A connection LUDV load-sensitive valve is open-minded；

Two-position three way electrically-controlled valve A, the oil circuit of two-position three way electrically-controlled valve E connection LUDV load-sensitive valve are open-minded, and two-position three way is automatically controlled The oil circuit closing of valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D connection LUDV load-sensitive valve；

Two-position three way electrically-controlled valve A, the oil circuit of two-position three way electrically-controlled valve D connection LUDV load-sensitive valve are open-minded, and two-position three way is automatically controlled The oil circuit closing of valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve；

Two-position three way electrically-controlled valve A, the oil circuit of two-position three way electrically-controlled valve C connection LUDV load-sensitive valve are open-minded, and two-position three way is automatically controlled The oil circuit closing of valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve；

The oil of two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve D and two-position three way electrically-controlled valve E connection LUDV load-sensitive valve Road is open-minded, the oil circuit closing of two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C connection LUDV load-sensitive valve；

The oil of two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve C and two-position three way electrically-controlled valve E connection LUDV load-sensitive valve Road is open-minded, the oil circuit closing of two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve D connection LUDV load-sensitive valve；

The oil of two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve C and two-position three way electrically-controlled valve D connection LUDV load-sensitive valve Road is open-minded, the oil circuit closing of two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D and the E connection of two-position three way electrically-controlled valve The oil circuit of LUDV load-sensitive valve is open-minded, and the oil circuit of two-position three way electrically-controlled valve B connection LUDV load-sensitive valve is closed；

Two-position three way electrically-controlled valve A, the oil circuit of two-position three way electrically-controlled valve B connection LUDV load-sensitive valve are open-minded, and two-position three way is automatically controlled The oil circuit closing of valve E, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D connection LUDV load-sensitive valve；

The oil of two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B and two-position three way electrically-controlled valve E connection LUDV load-sensitive valve Road is open-minded, the oil circuit closing of two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D connection LUDV load-sensitive valve；

The oil of two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B and two-position three way electrically-controlled valve D connection LUDV load-sensitive valve Road is open-minded, the oil circuit closing of two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve；

The oil of two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B and two-position three way electrically-controlled valve C connection LUDV load-sensitive valve Road is open-minded, the oil circuit closing of two-position three way electrically-controlled valve D, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve D and the E connection of two-position three way electrically-controlled valve The oil circuit of LUDV load-sensitive valve is open-minded, and the oil circuit of two-position three way electrically-controlled valve C connection LUDV load-sensitive valve is closed；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C and the E connection of two-position three way electrically-controlled valve The oil circuit of LUDV load-sensitive valve is open-minded, and the oil circuit of two-position three way electrically-controlled valve D connection LUDV load-sensitive valve is closed；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C and the D connection of two-position three way electrically-controlled valve The oil circuit of LUDV load-sensitive valve is open-minded, and the oil circuit of two-position three way electrically-controlled valve E connection LUDV load-sensitive valve is closed；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D and two three The oil circuit of logical electrically-controlled valve E connection LUDV load-sensitive valve is open-minded.

4. a kind of excavator hydraulic control system according to claim 3, which is characterized in that the discharge capacity of the gear pump A For 45ml/r, the discharge capacity of gear pump B is 20ml/r, and the discharge capacity of gear pump C is 10ml/r, and the discharge capacity of gear pump D is 8ml/r, tooth The discharge capacity of wheel pump E is 5ml/r.

5. a kind of excavator hydraulic control method, characterized in that LUDV load-sensitive valve, control list are arranged in hydraulic system Member, preset quantity gear pump and with the one-to-one two-position three way electrically-controlled valve of gear pump；The two-position three way electrically-controlled valve Oil inlet is connect with the oil outlet of corresponding gear pump, and two oil outlets of the two-position three way electrically-controlled valve are respectively connected to The oil inlet and system oil return oil circuit of LUDV load-sensitive valve, each two-position three way electrically-controlled valve are connect with control unit respectively, The hole LS of LUDV load-sensitive valve is connected with pressure sensor, and the pressure sensor is connect with control unit, and the control is single First its divides three phases to control two-position three way electrically-controlled valve:

Stage I, before hydraulic system work initially reaches system release pressure to pressure sensor detection pressure, control unit control The oil circuit of all two-position three way electrically-controlled valve connection LUDV load-sensitive valves is open-minded, and the oil circuit of connection system oil return oil circuit is closed；

Stage II, pressure sensor detection pressure reach after release pressure to before reaching system maximum pressure, control unit control Single two-position three way electrically-controlled valve or the combination of part two-position three way electrically-controlled valve open the oil circuit of connection LUDV load-sensitive valve to be adapted to Current pressure sensor detects pressure；

In the stage III, after hydraulic system pressure reaches system maximum pressure, control unit controls all two-position three ways in hydraulic system The oil circuit that electrically-controlled valve connects LUDV load-sensitive valve is closed, and the oil circuit for connecting system oil return oil circuit is open-minded.

Technical field:

The present invention relates to excavator technical field of hydraulic more particularly to a kind of excavator hydraulic control system and sides Method.

Background technique:

Wheel excavator using gear pump hydraulic system is the leading type excavator of current domestic manufacturers' production, construction It is the wheel excavator that gear pump and three six open up core type valve cooperation composition quantitative system.However, this excavator is hydraulic But there is following shortcomings for control system: first is that energy loss is big, not energy-efficient, main energy loss is damaged in the form of overflow It loses.Second is that efficiency causes economy poor than the hydraulic system low efficiency using plunger pump.

Summary of the invention:

In order to solve the above-mentioned technical problems, the present invention provides a kind of excavator hydraulic control system and methods, use Journey energy loss is small, and efficiency is higher.

The present invention is realized by following technical proposals:

A kind of excavator hydraulic control system, characterized in that including LUDV load-sensitive valve, control unit, preset quantity Gear pump and with the one-to-one two-position three way electrically-controlled valve of gear pump；The oil inlet of the two-position three way electrically-controlled valve with therewith The oil outlet of corresponding gear pump connects, and two oil outlets of the two-position three way electrically-controlled valve are respectively connected to LUDV load-sensitive The oil inlet and system oil return oil circuit of valve, each two-position three way electrically-controlled valve are connect with control unit respectively, LUDV load-sensitive valve The hole LS be connected with pressure sensor, the pressure sensor is connect with control unit, and described control unit divides three phases pair Two-position three way electrically-controlled valve is controlled:

Stage I, before hydraulic system work initially reaches system release pressure to pressure sensor detection pressure, control unit The oil circuit for controlling all two-position three way electrically-controlled valve connection LUDV load-sensitive valves is open-minded, and the oil circuit of connection system oil return oil circuit closes It closes；

Stage II, pressure sensor detection pressure reach after release pressure to before reaching system maximum pressure, control unit Control single two-position three way electrically-controlled valve or part two-position three way electrically-controlled valve combination open connection LUDV load-sensitive valve oil circuit with It is adapted to current pressure sensor and detects pressure；

In the stage III, after hydraulic system pressure reaches system maximum pressure, control unit controls in hydraulic system all two The oil circuit that threeway electrically-controlled valve connects LUDV load-sensitive valve is closed, and the oil circuit for connecting system oil return oil circuit is open-minded.

In another aspect of the present invention, described control unit is electric-controlled plate.

In another aspect of the present invention, the gear pump includes gear pump A, gear pump B, gear pump C, gear pump D And gear pump E, the two-position three way electrically-controlled valve include respectively with gear pump A, gear pump B, gear pump C, gear pump D and tooth The one-to-one two-position three way electrically-controlled valve A of wheel pump E, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D and two-position three way electrically-controlled valve E, the working method of the two-position three way electrically-controlled valve in the stage II include:

Only the oil circuit of two-position three way electrically-controlled valve A connection LUDV load-sensitive valve is open-minded；

Two-position three way electrically-controlled valve A, the oil circuit of two-position three way electrically-controlled valve E connection LUDV load-sensitive valve are open-minded, two-position three way The oil circuit closing of electrically-controlled valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D connection LUDV load-sensitive valve；

Two-position three way electrically-controlled valve A, the oil circuit of two-position three way electrically-controlled valve D connection LUDV load-sensitive valve are open-minded, two-position three way The oil circuit closing of electrically-controlled valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve；

Two-position three way electrically-controlled valve A, the oil circuit of two-position three way electrically-controlled valve C connection LUDV load-sensitive valve are open-minded, two-position three way The oil circuit closing of electrically-controlled valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve D and two-position three way electrically-controlled valve E connection LUDV load-sensitive valve Oil circuit it is open-minded, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C connection LUDV load-sensitive valve oil circuit close；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve C and two-position three way electrically-controlled valve E connection LUDV load-sensitive valve Oil circuit it is open-minded, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve D connection LUDV load-sensitive valve oil circuit close；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve C and two-position three way electrically-controlled valve D connection LUDV load-sensitive valve Oil circuit it is open-minded, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve oil circuit close；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D and two-position three way electrically-controlled valve E connect The oil circuit for connecing LUDV load-sensitive valve is open-minded, and the oil circuit of two-position three way electrically-controlled valve B connection LUDV load-sensitive valve is closed；

Two-position three way electrically-controlled valve A, the oil circuit of two-position three way electrically-controlled valve B connection LUDV load-sensitive valve are open-minded, two-position three way The oil circuit closing of electrically-controlled valve E, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D connection LUDV load-sensitive valve；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B and two-position three way electrically-controlled valve E connection LUDV load-sensitive valve Oil circuit it is open-minded, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D connection LUDV load-sensitive valve oil circuit close；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B and two-position three way electrically-controlled valve D connection LUDV load-sensitive valve Oil circuit it is open-minded, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve oil circuit close；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B and two-position three way electrically-controlled valve C connection LUDV load-sensitive valve Oil circuit it is open-minded, two-position three way electrically-controlled valve D, two-position three way electrically-controlled valve E connection LUDV load-sensitive valve oil circuit close；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve D and two-position three way electrically-controlled valve E connect The oil circuit for connecing LUDV load-sensitive valve is open-minded, and the oil circuit of two-position three way electrically-controlled valve C connection LUDV load-sensitive valve is closed；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C and two-position three way electrically-controlled valve E connect The oil circuit for connecing LUDV load-sensitive valve is open-minded, and the oil circuit of two-position three way electrically-controlled valve D connection LUDV load-sensitive valve is closed；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C and two-position three way electrically-controlled valve D connect The oil circuit for connecing LUDV load-sensitive valve is open-minded, and the oil circuit of two-position three way electrically-controlled valve E connection LUDV load-sensitive valve is closed；

Two-position three way electrically-controlled valve A, two-position three way electrically-controlled valve B, two-position three way electrically-controlled valve C, two-position three way electrically-controlled valve D and two The oil circuit of position threeway electrically-controlled valve E connection LUDV load-sensitive valve is open-minded.

In another aspect of the present invention, the discharge capacity of the gear pump A is 45ml/r, and the discharge capacity of gear pump B is 20ml/ The discharge capacity of r, gear pump C are 10ml/r, and the discharge capacity of gear pump D is 8ml/r, and the discharge capacity of gear pump E is 5ml/r.

A kind of excavator hydraulic control method, characterized in that LUDV load-sensitive valve, control list are set in hydraulic system Member, preset quantity gear pump and with the one-to-one two-position three way electrically-controlled valve of gear pump；The two-position three way electrically-controlled valve Oil inlet is connect with the oil outlet of corresponding gear pump, and two oil outlets of the two-position three way electrically-controlled valve are respectively connected to The oil inlet and system oil return oil circuit of LUDV load-sensitive valve, each two-position three way electrically-controlled valve are connect with control unit respectively, The hole LS of LUDV load-sensitive valve is connected with pressure sensor, and the pressure sensor is connect with control unit, and the control is single Member divides three phases to control two-position three way electrically-controlled valve:

Stage I, before hydraulic system work initially reaches system release pressure to pressure sensor detection pressure, control unit The oil circuit for controlling all two-position three way electrically-controlled valve connection LUDV load-sensitive valves is open-minded, and the oil circuit of connection system oil return oil circuit closes It closes；

Stage II, pressure sensor detection pressure reach after release pressure to before reaching system maximum pressure, control unit Control single two-position three way electrically-controlled valve or part two-position three way electrically-controlled valve combination open connection LUDV load-sensitive valve oil circuit with It is adapted to current pressure sensor and detects pressure；

In the stage III, after hydraulic system pressure reaches system maximum pressure, control unit controls in hydraulic system all two The oil circuit that threeway electrically-controlled valve connects LUDV load-sensitive valve is closed, and the oil circuit for connecting system oil return oil circuit is open-minded.

The beneficial effects of the present invention are: this excavator hydraulic control system and method have at various pressures it is different Flow is to solve the problems, such as overflow valve overflow in conventional excavators hydraulic control system and method and off-energy.

Detailed description of the invention:

Fig. 1 is each component connection structure schematic diagram in Example 1 and Example 2 of the present invention.

Fig. 2 is Example 1 and Example 2 of the present invention course of work pressure, changes in flow rate schematic diagram.

In attached drawing: 1, LUDV load-sensitive valve, 2, oil cooler, 3, pressure sensor, 4, control unit, 5, gear pump A, 6, Gear pump B, 7, gear pump C, 8, hydraulic oil container, 9, gear pump D, 10, gear pump E, 11, two-position three way electrically-controlled valve E, 12, stage I, 13, stage II, 14, stage III.

Specific embodiment:

Embodiments of the present invention are described further with reference to the accompanying drawings and embodiments:

In the description of this invention, it is to be understood that indicating position or positional relationship are described as based on attached drawing institute The orientation or positional relationship shown, is merely for convenience of description of the present invention and simplification of the description, rather than the dress of indication or suggestion meaning It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as protecting the present invention The limitation of range.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " setting ", " phase Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition Concrete meaning in invention.