SU1740802A1 - Electrohydraulic drive - Google Patents

Abstract

The use of industrial robots and hoisting machines. SUMMARY OF THE INVENTION: An adjustable pump is connected to the cavity of an executive cylinder through a three-way distributor, the k-poro suction and discharge lines are interconnected via a pressure relief valve and connected to a filling and power accumulator, respectively. Two make-up valves are connected by inputs to each other and to the pump suction line, the outlets are connected to hydraulic cylinder cavities, to which two inputs of recuperative valves are connected, the outputs of these valves are interconnected and equipped with a single recovery valve. operation, a two-position switch, a two-position distributor and a regenerative accumulator, with the Crimea through the switch connected the inputs of the regenerative valves and the suction line of the pump and the input valve direct action. The output of the actuating stage of this valve is connected through a distributor to the filling battery and to the inlets of the make-up valves connected to the suction line through a check valve. The output of the control stage is connected to the poro. 1 Il. cl

Description

The invention relates to hydraulics and can be used in the construction of industrial robots and hoisting / transport. lashin.

The purpose of the invention is to increase efficiency by ensuring continuity of recovery.

The drawing shows a diagram of the electro-hydraulic drive.

The actuator contains an executive hydraulic cylinder 1, to the cavity m 2, 3 of which through

the three-position four-line distributor 4 is connected to an adjustable pump 5, the suction and discharge lines 6 and 7 of which are interconnected via the overflow valve 8 and connected to the filling and power accumulators 9, 10, respectively. Special valves 11 and 12 are connected by inputs between themselves and with line 6, and outputs from cavities 2, 3, to which the inputs of recuperative valves 13 and 14 are connected,

with

about

Yu

The ports of which are interconnected and, via a two-position switch 15, with a regenerative battery 16, with the bis line inlet valve 17 of indirect action, the output of the executive stage of which (not indicated) is connected via the two-position valve 18 to the battery 9 and the valve inlets 11 12 connected to line 6 via a check valve 19, to the inlet of which is connected the output of the control stage (not indicated) of valve 17. Pressure sensor 20 is connected to line 7 and connected via a control unit 21 to a pump control mechanism 22 5 with which the drive motor 23 is associated. With the hydraulic cylinder 1, the control object 24 is connected.

Electro-hydraulic drive works as follows.

The hydraulic cylinder 1 moves the control object 24 in accordance with the control flow of the working fluid from the over-position distributor 4. The supply pressure at the inlet of the distributor 4 is maintained in accordance with the drive signal U3c by the pump 5, the power accumulator 10 and the overflow valve 8.

In the absence of a control signal Uy, the valve 4 is in the neutral position. The suppression-controlled pump 5 maintains the supply pressure in the accumulator 10 in accordance with the driving signal U3c at the input of the control unit 21. The reduction in the load of the pump 5 is made by changing the drive signal U3c. At the inlet of the pump 5, the working fluid comes from the regenerative accumulator 16, the pressure in which corresponds to the reference signal Uap at the inlet of the on-off distributor 18 and is maintained by the indirect action valve 17. When the pressure in the regenerative accumulator 16 decreases, the pump 5 is fed through a check valve 19 from the battery filler 9.

During cyclic operation during periods of braking, movement of the control object 24 under the action of mass or external influences, the energy of the control object can be stored in the regenerative accumulator 16 in the form of the working fluid energy supplied through the dip switch 15 and the regenerative valves 13 and 14.

In order to compensate for the losses, the working fluid enters the cavities 2 and 3 of the hydraulic cylinder 1 through the make-up valves 11 and 12 from the filling accumulator 9,

The energy consumed by the motor 23 is determined by the flow rate of the pump 5 and the pressure differential at its inlet and outlet, i.e. pressures in the power accumulator 10 and in the regenerative or filling accumulator 16 and 19. With a constant flow rate of the pump 5 and the pressure of the power accumulator

10, for example, MPa, the pressure in the filling accumulator 9 is equal to 4 MPa, and the pressure in the regenerative accumulator 16 can reach PPA- 18 MPa and more. Therefore, the relative reduction in energy consumption of the engine 23 can reach

g

PCA-PHA 22-0.4 21.6 PCA-PPA 22-18 4

5.4 times.

Claims (1)

Invention Formula An electro-hydraulic actuator containing an actuating hydraulic cylinder, to the cavity of which an adjustable one is connected through a three-position valve. suction pump v. The discharge lines of which are interconnected through an overflow valve and connected to the filling and power accumulators, respectively, and two make-up valves, connected to each other and to the suction line of the pump, and to the outlets to the cavities of the hydraulic cylinder, to which the inputs of two recuperative valves are connected, the outlets of which are interconnected and to the recovery device, as well as a non-return valve Efficiency by ensuring continuity of recovery, the recovery device is designed as an indirect valve, a two-way switch, a two-position distributor and a regenerative battery; the latter are connected to the inputs of the regenerative valves through a two-position switch and the suction line of the pump and the input of the direct-action valve are directly connected; the accumulator and inlets of the make-up valves connected to the suction line through a check valve to the inlet of which connected to the output of the control stage indirect valve action