Electro-hydraulic servo control device

Abstract

The invention discloses an electro-hydraulic servo control device, comprising a reset circuit and an AC circuit, wherein the reset circuit is connected to an input end of a circuit breaker Q1, an output end of the circuit breaker Q1 is connected to an input end of an AC contactor KM201, the AC contactor KM201 is connected to an input end of a circuit breaker Q2, and an output end of the circuit breaker Q2 is connected to an input reactor L1 and a cabinet top fan M2. The invention has a scientific and reasonable structure and is safe and convenient to use. The electro-hydraulic servo system adopts a servo motor and a quantitative pump system, which can be started and stopped at any time and supplied on demand without generating overflow, thereby bringing energy-saving effects. Through servo driver control and oil pressure PID closed-loop control, the speed is adjusted according to the flow demand of the system to save electric energy, and an asynchronous motor is replaced with a permanent magnet synchronous motor, which has low noise and fast response, saves unnecessary flow, reduces oil consumption, and reduces oil temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of servo control, in particular to an electro-hydraulic servo control device. Background Art

[0002] The electro-hydraulic servo control devices currently on the market are used in hydraulic stations in the metallurgical industry. The hydraulic stations use asynchronous motors to drive oil pumps to generate the pressure required by the system. The motors run at industrial frequency and high speed when the cylinder is in motion or not. When the cylinder is not in motion, the flow required by the system is small, and the excess flow flows back to the cylinder through the relief valve, resulting in a waste of electricity, high oil temperature, and loud noise from the asynchronous motor. Summary of the Invention

[0003] The present invention provides an electro-hydraulic servo control device, which can effectively solve the problems of the electro-hydraulic servo control device currently on the market in the metallurgical industry proposed in the above background technology. The hydraulic station of the oil pump is driven by an asynchronous motor to generate the pressure required by the system. The motor runs at an industrial frequency and high speed both when the oil cylinder is in motion and when it is not in motion. When the oil cylinder is not in motion, the flow required by the system is small, and the excess flow flows back to the oil cylinder through the overflow valve, resulting in waste of electric energy, high oil temperature, and high noise from the asynchronous motor.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an electro-hydraulic servo control device, comprising a reset circuit and an AC circuit, wherein the reset circuit is connected to the input end of a circuit breaker Q1, the output end of the circuit breaker Q1 is connected to the input end of an AC contactor KM201, the AC contactor KM201 is connected to the input end of a circuit breaker Q2, and the output end of the circuit breaker Q2 is connected to an input reactor L1 and a cabinet top fan M2;

[0005] The input reactor L1 is connected to the servo driver U1 , the output end of the servo driver U1 is connected to the input end of the output reactor L2 , and the output reactor L2 is connected to the servo motor M1 .

[0006] According to the above technical solution, a fuse F1 is connected in series between the output end of the circuit breaker Q2 and the inductor and the cabinet top fan M2.

[0007] According to the above technical solution, the servo motor M1 is three-phase electric, and the PE terminal is connected to the wire.

[0008] According to the above technical solution, the N terminal and the P terminal of the servo driver U1 are connected to the brake unit U2, and the P+ and BR terminals of the brake unit U2 are connected in series with the resistor R1.

[0009] According to the above technical solution, AI1, AI2 and +10V terminals of the servo driver U1 are connected in parallel to form power supplies for the N terminal and the P terminal.

[0010] According to the above technical solution, the AI3 and +15V terminals of the servo driver U1 are connected to the pressure sensor U3, and the pressure sensor U3 is grounded to reduce signal interference.

[0011] According to the above technical solution, the DI1 port of the servo driver U1 end is connected to the COM port through the socket X1 to form a DC power supply;

[0012] The KTY+ port and the KTY- port at the servo driver U1 end are connected to the socket X2.

[0013] According to the above technical solution, the live wire L end of the AC circuit is connected to the input end of the fuse F2, the output end of the fuse F2 is connected to the input end of the AC contactor normally open contact KM201, and the output end of the AC contactor normally open contact KM201 is connected to the motor heat dissipation extension M3.

[0014] According to the above technical solution, the reset circuit is 380V AC, and the AC circuit is 220V AC.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the structure of the present invention is scientific and reasonable, and it is safe and convenient to use. The electro-hydraulic servo system adopts a servo motor and a quantitative pump system, which can be started and stopped at any time and supplied on demand, and almost no overflow is generated, thereby bringing energy-saving effects. Through servo drive control and oil pressure PID closed-loop control, the speed is adjusted according to the system flow demand, saving electricity, and replacing the asynchronous motor with a permanent magnet synchronous motor, which has low noise and fast response, and unnecessary flow is saved, reducing fuel consumption and oil temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] In the attached figure:

[0018] Figure 1 It is a schematic diagram of the circuit structure of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] Example: Figure 1As shown, the present invention provides a technical solution, an electro-hydraulic servo control device, including a reset circuit and an AC circuit, the reset circuit is connected to the input end of the circuit breaker Q1, the output end of the circuit breaker Q1 is connected to the input end of the AC contactor KM201, the AC contactor KM201 is connected to the input end of the circuit breaker Q2, and the output end of the circuit breaker Q2 is connected to the input reactor L1 and the cabinet top fan M2;

[0021] The input reactor L1 is connected to the servo driver U1, the output end of the servo driver U1 is connected to the input end of the output reactor L2, and the output reactor L2 is connected to the servo motor M1.

[0022] According to the above technical solution, a fuse F1 is connected in series between the output end of the circuit breaker Q2 and the inductor and the cabinet top fan M2.

[0023] According to the above technical solution, the servo motor M1 is three-phase electric, and the PE terminal is connected to the wire.

[0024] According to the above technical solution, the N terminal and the P terminal of the servo driver U1 are connected to the brake unit U2, and the P+ and BR terminals of the brake unit U2 are connected in series with the resistor R1.

[0025] According to the above technical solution, AI1, AI2 and +10V terminals of the servo driver U1 are connected in parallel to form power supplies for the N terminal and the P terminal.

[0026] According to the above technical solution, AI3 and the +15V terminal of the servo driver U1 are connected to the pressure sensor U3, and the pressure sensor U3 is grounded to reduce signal interference.

[0027] According to the above technical solution, the DI1 port on the servo driver U1 end is connected to the COM port through the socket X1 to form a DC power supply;

[0028] The KTY+ port and KTY- port on the servo drive U1 end are connected to socket X2.

[0029] According to the above technical solution, the live wire L end of the AC circuit is connected to the input end of the fuse F2, the output end of the fuse F2 is connected to the input end of the AC contactor normally open contact KM201, and the output end of the AC contactor normally open contact KM201 is connected to the motor heat dissipation extension M3.

[0030] According to the above technical solution, the reset circuit is 380V AC, and the AC circuit is 220V AC.

[0031] After the circuit breaker Q1 is closed, the AC contactor KM201 is energized. At this time, the normally open contact KM201 of the AC contactor is energized, and the motor heat dissipation extension M3 is energized for normal rotation and heat dissipation. When the circuit breaker Q2 is closed, the servo driver U1 is energized. After the servo driver U1 is energized, the braking unit U2 is adjusted due to the change in the resistance value of the resistor R1. The braking unit U2 transmits the signal to the servo driver U1, and the servo driver U1 implements normal PID adjustment. At the same time, the pressure sensor U3 transmits the analog signal to the servo driver U1, converts the analog signal into a digital signal, and controls it. Finally, the servo motor M1 is started, and the servo motor M1 is a permanent magnet synchronous motor.

[0032] The electro-hydraulic servo system uses a servo motor and a quantitative pump system. It can be started and stopped at any time and supplied on demand with almost no overflow, thus bringing energy-saving effects. Through servo drive control and oil pressure PID closed-loop control, the speed is adjusted according to the system flow demand to save electricity. In addition, the asynchronous motor is replaced with a permanent magnet synchronous motor, which has low noise and fast response. Unnecessary flow is saved, fuel consumption is reduced, and oil temperature is lowered.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electro-hydraulic servo control device, comprising a reset circuit and an AC circuit, characterized in that: The reset circuit is connected to the input end of the circuit breaker Q1, the output end of the circuit breaker Q1 is connected to the input end of the AC contactor KM201, the AC contactor KM201 is connected to the input end of the circuit breaker Q2, and the output end of the circuit breaker Q2 is connected to the input reactor L1 and the cabinet top fan M2; The input reactor L1 is connected to the servo driver U1, the output end of the servo driver U1 is connected to the input end of the output reactor L2, and the output reactor L2 is connected to the servo motor M1; A fuse F1 is connected in series between the output end of the circuit breaker Q2 and the inductor and the cabinet top fan M2; The servo motor M1 is three-phase electricity, and the PE terminal is connected to the wire; The N terminal and the P terminal of the servo driver U1 are connected to the brake unit U2, and the P+ and BR terminals of the brake unit U2 are connected in series with a resistor R1; The AI1, AI2 and +10V terminals of the servo driver U1 are connected in parallel to form power supplies for the N and P terminals; The AI3 and +15V terminals of the servo driver U1 are connected to the pressure sensor U3, and the pressure sensor U3 is grounded to reduce signal interference; The DI1 port of the servo driver U1 is connected to the COM port via the socket X1 to form a DC power supply; The KTY+ port and KTY- port of the servo driver U1 are connected to the socket X2; The live wire L end of the AC circuit is connected to the input end of the fuse F2, the output end of the fuse F2 is connected to the input end of the AC contactor normally open contact KM201, and the output end of the AC contactor normally open contact KM201 is connected to the motor cooling extension M3; The reset circuit is 380V AC, and the AC circuit is 220V AC.

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