CN108331793B - A Hydraulic Diversion System with Circuit Controlling Pressure Proportion - Google Patents

Abstract

The invention discloses a hydraulic pressure shunting system with a circuit for controlling pressure proportion, which comprises an oil tank, a shunting valve, a constant delivery pump, a motor and a proportion control circuit unit, wherein one output end of the shunting valve is respectively connected with a first electro-hydraulic proportion pressure valve and a first stop valve, the other output end of the shunting valve is respectively connected with a second electro-hydraulic proportion pressure valve and a second stop valve, the first electro-hydraulic proportion pressure valve is connected with a first proportion amplifier, and the proportion control circuit unit is connected with the first proportion amplifier and the second proportion amplifier. The invention takes two output branches of the proportional control circuit unit as executing elements, controls the voltage ratio of the two output branches by controlling the displacement of the electric brush of the potentiometer, and further controls the displacement ratio of the valve cores of the first electro-hydraulic proportional pressure valve and the second electro-hydraulic proportional pressure valve, thereby realizing the purpose of randomly distributing the pressure ratio of the two partial pressure branches, pushing the load to move, finally realizing the proportional distribution of any pressure, and having wide application range.

Description

A Hydraulic Diversion System with Circuit Controlling Pressure Proportion

technical field

The invention relates to a hydraulic shunt system, in particular to a hydraulic shunt system with a circuit control pressure ratio.

Background technique

The electro-hydraulic proportional valve is the proportional electromagnet in the valve to produce corresponding actions according to the input electrical signal, so that the working valve spool is displaced, the valve port size is changed, and the pressure and flow output proportional to the input voltage are completed. Compared with ordinary hydraulic valves with manual adjustment and on-off control, the electro-hydraulic proportional valve can significantly simplify the hydraulic system, realize the control of complex programs and motion laws, facilitate mechatronics, and greatly improve the hydraulic system through electrical signal control. The control level is high, and the anti-pollution ability is strong, which greatly reduces the working failure caused by pollution and improves the working stability and reliability of the hydraulic system. Therefore, the application field is expanding day by day, showing its good application prospect.

Now, in order to achieve a specific pressure ratio parameter, a corresponding hydraulic system needs to be specially designed, that is, a hydraulic system can only achieve a specific pressure ratio, but cannot achieve other pressure ratios. If you want to achieve other pressure ratios, you need to design other pressure ratios. However, the scope of application is narrow and the cost is high, so there is an urgent need for a hydraulic system that can adjust the pressure in any proportion.

SUMMARY OF THE INVENTION

In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a hydraulic shunt system with a circuit control pressure ratio, which can realize the proportional distribution of any pressure and has a wide range of adaptability.

In order to achieve the above goals, the present invention adopts the following technical scheme: a hydraulic shunt system for circuit control of pressure ratio, comprising a fuel tank, a shunt valve, a quantitative pump, an electric motor and a proportional control circuit unit, the fuel tank, the input end of the shunt valve, the electric motor Both are connected to the quantitative pump, a coupling is connected between the motor and the quantitative pump, one output end of the diverter valve is respectively connected to the first electro-hydraulic proportional pressure valve and the first cut-off valve, and the other output of the diverter valve is connected. The terminals are respectively connected to the second electro-hydraulic proportional pressure valve and the second shut-off valve, the input terminal of the first electro-hydraulic proportional pressure valve is connected to the output terminal of the first proportional amplifier, and the input terminal of the first electro-hydraulic proportional pressure valve is also An inductive displacement sensor is connected to the reverse input end of the first proportional amplifier, the input end of the second electro-hydraulic proportional pressure valve is connected to the output end of the second proportional amplifier, and the input end of the second electro-hydraulic proportional pressure valve is also The two inductive displacement sensors are connected to the inverting input terminal of the second proportional amplifier, and the two voltage output branches of the proportional control circuit unit are respectively connected to the non-inverting input terminal of the first proportional amplifier and the non-inverting input terminal of the second proportional amplifier. .

Further, the proportional control circuit unit includes a potentiometer, and the moving end of the potentiometer is connected to the reverse input end of the subtractor module and the same-direction input end of the first following voltage operator module, and a fixed end of the potentiometer is connected. The power supply is connected to the same-direction input end of the subtractor module, the output end of the subtractor module is connected to the same-direction input end of the second following voltage operator module, and the two voltage output branches of the proportional control circuit unit are respectively The output terminal of the first following voltage calculator module and the output terminal of the second following voltage calculator module.

Further, the oil supply amount of the quantitative pump is a constant value.

Further, an oil suction filter is connected between the oil inlet of the quantitative pump and the oil tank.

Further, an air filter and a liquid level gauge are arranged on the oil tank.

Compared with the prior art, the beneficial effects of the present invention are: the present invention uses the two output branches of the proportional control circuit unit as the executive elements, and controls the voltage ratio of the two output branches by controlling the displacement of the potentiometer brush, Further control the displacement ratio of the spools of the first electro-hydraulic proportional pressure valve and the second electro-hydraulic proportional pressure valve, so as to achieve the purpose of arbitrary distribution of the pressure ratio of the two partial pressure branches, and push the load to move, and finally achieve any pressure proportional distribution, adapt to a wide range.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic circuit diagram of the proportional control circuit unit of the present invention.

In the picture: 1. Fuel tank, 2. Oil suction filter, 3. Air filter, 4. Liquid level gauge, 5. Dosing pump, 6. Coupling, 7. Electric motor, 8. Diverter valve, 9. First Electro-hydraulic proportional pressure valve, 10, first inductive displacement sensor, 11, first proportional amplifier, 12, first shut-off valve, 13, second electro-hydraulic proportional pressure valve, 14, second inductive displacement sensor, 15, The second proportional amplifier, 16, the second cut-off valve, 17, the proportional control circuit unit, 171, the potentiometer, 172, the subtractor module, 173, the first follower module, 174, the second follower module.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Fig. 1 and Fig. 2, a hydraulic diverting system with circuit control pressure proportional, including oil tank 1, diverting valve 8, quantitative pump 5, electric motor 7 and proportional control circuit unit 17, oil tank 1, diverting valve 8 input end, The electric motor 7 is connected with the quantitative pump 5, the coupling 6 is connected between the electric motor 7 and the quantitative pump 5, and an output end of the diverter valve 8 is respectively connected with the first electro-hydraulic proportional pressure valve 9 and the first cut-off valve 12, and the diverter valve 8 The other output end of the first electro-hydraulic proportional pressure valve 13 and the second shut-off valve 16 are respectively connected, the input end of the first electro-hydraulic proportional pressure valve 9 is connected to the output end of the first proportional amplifier 11, the first electro-hydraulic proportional pressure valve 9 The input end is also connected to the reverse input end of the first proportional amplifier 11 through the first inductive displacement sensor 10, the input end of the second electro-hydraulic proportional pressure valve 13 is connected to the output end of the second proportional amplifier 15, and the second electro-hydraulic proportional pressure valve is connected to the output end of the second proportional amplifier 15. The input end of 13 is also connected to the inverting input end of the second proportional amplifier 15 through the second inductive displacement sensor 14, and the two output branches of the proportional control circuit unit 17 are respectively connected to the same-direction input end of the first proportional amplifier 11 and the second proportional amplifier 11. The same-direction input end of the proportional amplifier 15; the proportional control circuit unit 17 includes a potentiometer 171, and the moving end of the potentiometer 171 is connected to the inverting input end of the subtractor module 172 and the same-direction input end of the first following voltage operator module 173, One fixed end of the potentiometer 171 is connected to the power supply and the same-direction input end of the subtractor module 172, the other fixed end of the potentiometer 171 is grounded, and the output end of the subtractor module 172 is connected to the second following the voltage operator module 174 in the same direction Input end, the two voltage output branches of the proportional control circuit unit 17 are respectively the output end of the first follower voltage calculator module 173 and the output end of the second follower voltage calculator module 174; the oil supply of the quantitative pump 5 As a constant value, an oil suction filter 2 is connected between the oil inlet of the quantitative pump 5 and the oil tank 1, and the oil tank 1 is provided with an air filter 3 and a liquid level gauge 4.

In this embodiment, the voltage of one branch of the two input branches of the subtractor module 172 in the proportional control circuit unit 17 is U, the other branch is U ₁ controlled by the potentiometer 171 , and the voltage of the subtractor module 172 is U 1 . The output voltage is U ₂ =UU ₁ . It can be seen from FIG. 2 that the voltages of the two output branches of the proportional control circuit unit 17 are U ₁ and U ₂ respectively, and the sum of U ₁ and U ₂ is the set constant value U, Since the value _of U1 is linearly related to the displacement of the potentiometer 171 brush, the ratio of the voltages across the two output branches is:

In the formula: L ₁ is the displacement of the brush of the potentiometer 171, L is the length of the resistor body of the potentiometer 171, and K is the voltage ratio of the two output branches of the proportional control circuit unit 17.

It can be obtained from the above formula: by controlling the displacement of the potentiometer 171, the purpose of arbitrary proportional distribution of the voltages of the two output branches of the proportional control circuit unit can be achieved. The first following voltage calculator module 173 and the second following voltage calculator module 174 start The functions of buffering, isolating and improving the load carrying capacity can play the role of impedance matching in the circuit, which can make the amplifier circuit of the latter stage work better.

The two output branches of the proportional control circuit unit 17 are respectively connected to the non-inverting input end of the first proportional amplifier 11 and the non-inverting input end of the second proportional amplifier 15, and the first proportional amplifier 11 and the second proportional amplifier 15 output corresponding control respectively. Electric current, the electromagnet push rods of the first electro-hydraulic proportional pressure valve 9 and the second electro-hydraulic proportional pressure valve 13 respectively output electromagnetic force proportional to the voltage, and act on the first electro-hydraulic proportional pressure valve 9 through the force transmission spring respectively. The poppet valve core and the poppet valve core of the second electro-hydraulic proportional pressure valve 13, meanwhile, the first inductive displacement sensor 10 and the second inductive displacement sensor 14 detect the first electro-hydraulic proportional pressure valve 9 and the second electro-hydraulic proportional pressure valve 9 respectively. The actual position of the solenoid armature push rod of the pressure valve 13 is negatively fed back to the corresponding first proportional amplifier 11 and the second proportional amplifier 15, and the error signal compared with the feedback voltage and the set voltage is used to control the displacement of the armature, that is, in The armature position closed-loop control is formed in the valve, and the displacement closed-loop control can eliminate the influence of friction and other interference, ensure that the spring seat can have a definite position proportional to the input signal, and obtain an accurate spring compression amount, thereby obtaining accurate pressure valve to control pressure.

P ₁ =K ₁ U ₁ P ₂ =K ₁ U ₂

In the formula: P ₁ is the pressure of the regulating branch of the first electro-hydraulic proportional pressure valve 9, P ₂ is the pressure of the regulating branch of the second electro-hydraulic proportional pressure valve 13, K ₁ is the control pressure and input signal of the electro-hydraulic proportional pressure valve The proportional relationship of , L ₁ is the displacement of the brush of the potentiometer 171 , L is the length of the resistor body of the potentiometer 171 , and K is the voltage ratio of the two output branches of the proportional control circuit unit 17 .

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (2)

1. The utility model provides a hydraulic pressure reposition of redundant personnel system of circuit control pressure proportion, includes oil tank, flow divider, constant delivery pump, motor, its characterized in that: the proportional control circuit unit is also included, the oil tank, the input end of the diverter valve and the motor are all connected with the constant delivery pump, a coupler is connected between the motor and the constant delivery pump, one output end of the diverter valve is respectively connected with a first electro-hydraulic proportional pressure valve and a first stop valve, the other output end of the diverter valve is respectively connected with a second electro-hydraulic proportional pressure valve and a second stop valve, the input end of the first electro-hydraulic proportional pressure valve is connected with the output end of a first proportional amplifier, the input end of the first electro-hydraulic proportional pressure valve is also connected with the reverse input end of the first proportional amplifier through a first inductive displacement sensor, the input end of the second electro-hydraulic proportional pressure valve is connected with the output end of a second proportional amplifier, the input end of the second electro-hydraulic proportional pressure valve is also connected with the reverse input end of the second proportional amplifier through, two voltage output branches of the proportional control circuit unit are respectively connected with the homodromous input end of the first proportional amplifier and the homodromous input end of the second proportional amplifier;

the proportional control circuit unit comprises a potentiometer, the moving end of the potentiometer is connected with the reverse input end of the subtraction operator module and the equidirectional input end of the first following voltage operator module, one fixed end of the potentiometer is connected with a power supply and the equidirectional input end of the subtraction operator module, the output end of the subtraction operator module is connected with the equidirectional input end of the second following voltage operator module, two voltage output branches of the proportional control circuit unit are respectively the output end of the first following voltage operator module and the output end of the second following voltage operator module, and the oil supply amount of the constant delivery pump is a constant value;

the voltage ratio of the two output branches of the proportional control circuit unit is as follows:

wherein: u is a branch voltage of two input branches of the subtraction operator module in the proportional control circuit unit, U₁The other branch is controlled by a potentiometer, and the output voltage of the subtraction arithmetic module is U₂＝U-U₁，L₁Is the displacement of the potentiometer brush, L isThe length of the resistor body of the potentiometer, K is the voltage ratio of two output branches of the proportional control circuit unit;

the pressure ratio of the pressure of the first electro-hydraulic proportional pressure valve regulating branch to the pressure of the second electro-hydraulic proportional pressure valve regulating branch is as follows:

P₁＝K₁U₁P₂＝K₁U₂

wherein: p₁Regulating the pressure of the branch, P, for the first electro-hydraulic proportional pressure valve₂Regulating the pressure of the branch for a second electro-hydraulic proportional pressure valve, K₁For controlling the proportional relationship between pressure and input signal by means of electro-hydraulic proportional pressure valves, L₁The displacement of the potentiometer brush, L the length of the potentiometer resistor body and K the voltage ratio of the two output branches of the proportional control circuit unit;

an oil suction filter is connected between an oil inlet of the constant delivery pump and the oil tank.

2. The hydraulic pressure shunt system of claim 1, wherein: and an air filter and a liquid level meter are arranged on the oil tank.

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