CN201166021Y - Pump control type electrohydraulic actuator - Google Patents

Abstract

A pump-control type electro-hydraulic actuating mechanism comprises a position sensor and a position controller. The position controller is connected with the position sensor via a signal wire, the position sensor is connected with a cylinder with single end exposed, two cavities of the cylinder with single end exposed are respectively connected with two ends of a hydraulic lock, and the two ends of the hydraulic lock are connected with a two-way pump, a left overflow valve, a right overflow valve and two one-way valves, the other ends of the two one-way valves are connected with each other and then connected with an oil filter arranged in an oil tank, the left overflow valve and the right overflow valve are connected with the oil tank via pipes, an air filter and a liquid level temperature meter are respectively arranged on the top and the lateral sides of the oil tank, a remote control chamber is connected with a motor control unit via a wire, the two-way pump is connected with a motor which is connected with the motor control unit. The motor control unit and the rotating speed of the motor can be adjusted by the control chamber according to signals which are fed back by the position sensor to the position controller, thereby adjusting the rotating speed of the two-way pump to realize variation of the two cavities of the cylinder, and achieving the purpose of position adjustment. The pump-control type electro-hydraulic actuating mechanism is low in energy consumption, small in volume, low in cost and excellent in control effect.

Description

Pump control type electrohydraulic actuator

Technical field

The utility model relates to a kind of two-way pump control type electrohydraulic actuator, particularly relates to a kind of pump control type electrohydraulic actuator by oil hydraulic pump prosecutor formula realization positioning control, belongs to the electrohydraulic control technology field.

Background technique

Valve is controlled at industrial field and uses very extensively, along with vigorously advocating of conservation-minded society, makes each system of industrial field all reduce volume as much as possible, reduces cost, and reduces energy consumption.

Electrohydraulic control system has volume control and throttling control two big classes.Traditional viewpoint is to adopt the throttling control technique in the middle low power system high to dynamic response requirement, and adopt the volume control technique in high-power system.The deficiency of throttling control electrohydraulic system maximum is to have big restriction loss, and system capacity efficient is low and cause system's heating.So new developing direction is without valve, directly control the motion of oil hydraulic cylinder with oil hydraulic pump.

When final controlling element is the uniform section oil hydraulic cylinder of oil hydraulic motor and two rods, because of its two chambeies flow symmetry, pump equates with the oily flow that is discharged to oil hydraulic cylinder from the oily flow that oil hydraulic cylinder sucks, the oil inlet and outlet of oil hydraulic pump just can directly link to each other with two chambeies of oil hydraulic motor or uniform section oil hydraulic cylinder, and the motion of control oil hydraulic cylinder, the movement velocity of oil hydraulic cylinder and pump delivery and rotating speed are proportional.But the final controlling element of extensive use is the differential hydro cylinder of single rod in hydraulics.It is little to be characterized in taking up room, and ouput force is big, but the flow of the oil that oil inlet and outlet is discharged is unequal.Like this as still continue to use the circuit theory of control uniform section cylinder, system just can't proper functioning, so pump control differential cylinder is the difficult point of pump control techniques always.There is document to show, the hydraulic transformer that an oil hydraulic pump and motor are formed is set in the loop,, can adapt to the difference in flow of differential cylinder by conversion to pressure and flow.Flow deviation for the compensates for differential cylinder, Germany REXROTH company has developed the circuit theory with the moving differential cylinder of two servopump combination floodings, with the difference in flow that 2 pumps come the compensates for differential cylinder, this invention is applied to this principle the electrohydraulic control system of variable speed electric motors, particularly and quantitative hydraulic pump composition.But system architecture complexity, cost height with hydraulic transformer and two pumps are formed are unfavorable for utilization and extention.Through the research of Hamburg, Germany polytechnical university, proposed to utilize the separate unit servopump, the principle that cooperates Pilot operated check valve to come the asymmetric flow of balanced differential cylinder.In this loop, the outlet of two Pilot operated check valves links to each other with the oil inlet and outlet of oil hydraulic cylinder two chambeies and hydraulic bidirectional pump respectively, the import of two Pilot operated check valves is communicated with and is connected on the fuel tank or low pressure accumulator of repairing, when oil hydraulic pump during to the rodless cavity fuel feeding of oil hydraulic cylinder, the oily flow that is provided greater than the cylinder motion from the oily flow of rod chamber sucking-off because of oil hydraulic pump, this cavity pressure is reduced, and to the rod chamber repairing, additional oil mass is exactly the difference in flow in oil hydraulic cylinder two chambeies by one-way valve in system.When oil hydraulic cylinder is regained, the oil-feed of oil hydraulic cylinder rod chamber, the rodless cavity oil extraction, at this moment the pressure of rod chamber makes another one-way valve opens, and the fluid that rodless cavity is unnecessary flows back to fuel tank.The subject matter that this loop exists is that Pilot operated check valve is in " on-off " state continually in frequent reciprocal movement process, may cause the impact concussion of hydraulic system, is not suitable for the valve control system of frequent adjusting; In addition, this loop does not have Locked valve position " lock-bit " function.

Summary of the invention

The purpose of this utility model is to have overcome above-mentioned the deficiencies in the prior art, and a kind of pump control type electrohydraulic actuator of realizing positioning control by oil hydraulic pump prosecutor formula is provided.

The technological scheme of pump control type electrohydraulic actuator of the present utility model is to realize like this, a kind of pump control type electrohydraulic actuator, the far-end control room is connected with position controller by signaling line, described position controller is connected with position transducer by signaling line, described position transducer with singly go out the hair style oil cylinder and be connected, described two chambeies that singly go out the hair style oil cylinder are connected with the hydraulic lock two ends by pipeline respectively, the two ends of described hydraulic lock connect two-way pump, the two ends of described two-way pump also are connected with right relief valve with left relief valve respectively, the two ends of described two-way pump also connect two one-way valves respectively, the other end of described two one-way valves links together and is connected with an oil filter, described oil filter is installed in the fuel tank, the left side of described left relief valve, the right side of right relief valve also links to each other with fuel tank by pipeline, air-strainer is installed in the fuel tank top, the liquid level thermometer is installed in the fuel tank sidewall, the far-end control room also is connected with motor control unit by power line, described two-way pump also is connected with motor, and described motor is connected with motor control unit by signaling line.

Pump control type electrohydraulic actuator of the present utility model has following advantage with respect to prior art:

The unbalanced problem of changes in flow rate when 1, the utility model can effectively solve the motion of pump control list rod cylinder, it is steady singly to go out the hair style cylinder action, does not have impact noise in oil cylinder motion and the commutation process.

2 energy consumptions are low, and volume is little, and are simple in structure, economical and practical.

Description of drawings

Fig. 1 is a pump control type electrohydraulic actuator parts connection diagram of the present utility model.

Embodiment

Now the invention will be further described in conjunction with the accompanying drawings:

The technological scheme of pump control type electrohydraulic actuator of the present invention is to realize like this, a kind of pump control type electrohydraulic actuator, the far-end control room is connected with position controller 14 by signaling line, position controller 14 is connected with position transducer 1 by signaling line, position transducer 1 with singly go out hair style oil cylinder 2 and be connected, two chambeies that singly go out hair style oil cylinder 2 are connected with hydraulic lock 3 two ends by pipeline respectively, the two ends of hydraulic lock 3 connect two-way pump 6, the two ends of two-way pump 6 also are connected with right relief valve 5 with left relief valve 4 respectively, the two ends of two-way pump 6 also connect one-way valve 8 respectively, one-way valve 9, one-way valve 8, the other end of one-way valve 9 links together and is connected with oil filter 10, oil filter 10 is installed in the fuel tank 12, the left side of left side relief valve 4, the right side of right relief valve 5 also links to each other with fuel tank 12 by pipeline, air-strainer 11 is installed in fuel tank 12 tops, liquid level thermometer 13 is installed in fuel tank 12 sidewalls, the far-end control room also is connected with motor control unit 15 by power line, two-way pump 6 also is connected with motor 7, and motor 7 is connected with motor control unit 15 by signaling line.

When position controller 14 receives the position control signal of sending in the control room, position controller 14 compares the position signal of this signal and position transducer 1 feedback, export to motor control unit 15 after the deviation process internal control algorithm process relatively, motor control unit 15 can be exported corresponding motor speed signal and steering controling signal, and drive motor 7 rotations, the rotation of motor 7 drives two-way pump 6 and rotates synchronously, the output hydraulic flow also causes an end output oil port pressure of two-way pump 6 to raise, open hydraulic lock 3, promote singly to go out 2 actions of hair style oil cylinder, position transducer 1 can feed back to position controller 14 to the position signal that singly goes out hair style oil cylinder 2 in real time simultaneously, up to deviation signal less than the minimal internal dead space scope, motor control unit 15 output stop signals, motor 7 and two-way pump 6 are shut down, singly go out hair style oil cylinder 2 and promptly arrive the equilibrium position, the flow energy imbalance appears in oil extraction and oil suction meeting during two-way pump 6 rotations, when singly going out hair style oil cylinder 2 pistons when rod chamber moves, less than discharging oil mass to rodless cavity, not enough oil mass is then sucked from fuel tank 12 by two-way pump 6 supplies two-way pump 6 from the oil mass that singly goes out hair style oil cylinder 2 rod chambers and return two-way pump; When singly going out hair style oil cylinder 2 pistons when rodless cavity moves, from singly going out oil mass that hair style oil cylinder 2 rodless cavities return two-way pump 6 greater than discharging oil mass to rod chamber, unnecessary oil mass is returned fuel tank 12 by left relief valve 4 or right relief valve 5.Because fuel tank 12 repairings or the oil mass of holding oil are parts that singly goes out the required oil mass of hair style oil cylinder 2 motion, so the volume of fuel tank 12 needn't be very big, in addition, because the flow equilibrium problem is by from subsidiary fuel tank 12 oil suctions with hold the oil realization, do not need two-way pump 6 is carried out any transformation.

Hydraulic lock 3 is used for when two-way pump 6 shuts down, pin and singly go out 2 liang of chambeies of hair style oil cylinder, the load situation drift of avoiding loading moment to cause, left side relief valve 4, right relief valve 5 are opened when two-way pump 6 outlet pressures are high, to guarantee that system pressure can not surpass safety value, one-way valve 8, one-way valve 9 are used for guaranteeing that the output flow of two-way pump 6 can directly not return fuel tank 12, and the oil that oil filter 10 is used for guaranteeing sucking two-way pump 6 is clean, avoids foreign matter that two-way pump 6 is caused damage.

Claims (1)

1, a kind of pump control type electrohydraulic actuator, comprise position controller (14), it is characterized in that, described position controller (14) is connected with position transducer (1) by signaling line, described position transducer (1) with singly go out hair style oil cylinder (2) and be connected, described two chambeies that singly go out hair style oil cylinder (2) are connected with hydraulic lock (3) two ends by pipeline respectively, the two ends of described hydraulic lock (3) connect two-way pump (6), the two ends of described two-way pump (6) also are connected with right relief valve (5) with left relief valve (4) respectively, the two ends of described two-way pump (6) also connect one-way valve (8) respectively, one-way valve (9), described one-way valve (8), the other end of one-way valve (9) links together and the oil filter (10) interior with being arranged on fuel tank (12) is connected, the left side of described left relief valve (4), the right side of right relief valve (5) also links to each other with fuel tank (12) by pipeline, fuel tank (12) top is provided with air-strainer (11), the side is provided with liquid level thermometer (13), the far-end control room also is connected with motor control unit (15) by power line, described two-way pump (6) also is connected with motor (7), and described motor (7) is connected with motor control unit (15) by signaling line.

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