Spring return electric actuator

Abstract

The utility model discloses a spring reset type electric actuator, including shell, and install in the shell's servo motor and push rod, servo motor's output shaft connects gear no.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, specifically a spring-reset electric actuator. Background Technology

[0002] Currently, existing actuators have the following drawbacks: 1. Valves are prone to becoming difficult to open. 2. Due to design flaws, assembly and maintenance require specialized equipment that is difficult to operate. 3. The product poses a significant safety hazard: during assembly and maintenance, the spring can easily open suddenly, and because the spring force is relatively large, operators are frequently injured by the spring force. Therefore, improvements are needed. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this utility model provides a spring-reset electric actuator.

[0004] This utility model is achieved through the following technical solution: A spring-reset electric actuator includes a housing, a servo motor and a push rod installed inside the housing, characterized in that: the output shaft of the servo motor is connected to a first gear, the first gear meshes with a second gear, the second gear meshes with a rack guide rail, the rack guide rail is fixed at the beginning of the push rod, and the servo motor drives the push rod to extend and retract through the first gear, the second gear and the rack guide rail; The push rod is connected to the valve stem of the valve through a connector. A stroke pointer is installed on the connector, and a stroke scale is installed on the inside of the protective bracket. The stroke pointer corresponds to the stroke scale.

[0005] A cylindrical compression spring is fitted in the middle of the push rod. The spring is located inside the outer shell. A pressure plate is fixedly installed on the push rod. The pressure plate is used to compress the spring. One end of the spring pushes against the pressure plate, and the other end of the spring pushes against the inside of the outer shell. When the push rod extends, it compresses the spring. The spring rebounds and pushes against the pressure plate to drive the push rod to retract.

[0006] A cable connector is installed on the outside of the housing, and the servo motor's wires are led out of the housing through the cable connector.

[0007] A protective bracket is installed at the lower end of the outer casing, the lower part of the push rod is located inside the protective bracket, and the end of the push rod is connected to the valve.

[0008] The diameter of gear one is smaller than the diameter of gear two, and gear one and gear two together form a reducer structure.

[0009] The beneficial effects of this utility model are that the electric actuator has a large thrust, and is simple, safe, and reliable in production and maintenance. The electric actuator has an automatic reset function after power failure, improving system safety; it uses electric drive to achieve precise control and efficient operation with rapid response; through the flexible extension and retraction of the push rod, it can flexibly drive the opening and closing of the load valve; the electric actuator has a compact structure, and the spring is firmly and reliably installed, effectively preventing the spring from breaking.

[0010] This electric actuator is widely used in industrial automation, such as in the control of emergency shut-off valves and safety gate valves in petrochemical, water treatment, and HVAC systems, to ensure that equipment returns to a safe state in the event of a failure. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the front view of this utility model. Figure 2 This is a magnified schematic diagram of the internal structure of an electric actuator.

[0012] In the diagram: 1. Cover, 2. Housing, 3. Protective bracket, 4. Cable connector, 5. Servo motor, 6. Gear 1, 7. Gear 2, 8. Rack and pinion guide, 9. Pressure plate, 10. Cylindrical compression spring, 11. Push rod, 12. Valve, 13. Connector, 14. Stroke pointer, 15. Stroke scale. Detailed Implementation

[0013] The attached figure shows a specific embodiment of this utility model.

[0014] The utility model of spring-reset electric actuator includes a housing, a servo motor 5 and a push rod 11 installed inside the housing. The output shaft of the servo motor is connected to a gear 6, which meshes with a gear 7. The gear 2 meshes with a rack guide rail 8. The rack guide rail is fixed at the beginning of the push rod. The servo motor drives the push rod to extend and retract through the gear 1, the gear 2 and the rack guide rail. The push rod is connected to the valve stem of the valve 12 via the connector 13. The stroke pointer 14 is installed on the connector, and the stroke scale 15 is installed on the inner side of the protective bracket. The stroke pointer corresponds to the stroke scale.

[0015] A cylindrical compression spring 10 is fitted in the middle of the push rod. The spring is located inside the outer shell. A pressure plate 9 is fixedly installed on the push rod. The pressure plate is used to compress the spring. One end of the spring pushes against the pressure plate, and the other end of the spring pushes against the inner side of the outer shell. When the push rod extends, it compresses the spring. The spring rebounds and pushes against the pressure plate to drive the push rod to retract.

[0016] Cable connector 4 is installed on the outside of the housing, and the servo motor wires are led out of the housing through the cable connector.

[0017] A protective bracket 3 is installed at the lower end of the outer casing, the lower part of the push rod is located inside the protective bracket, and the end of the push rod is connected to the valve.

[0018] The diameter of gear one is smaller than the diameter of gear two, and gear one and gear two together form a reducer structure.

[0019] The outer shell includes a cover 1 and a housing 2, which are fastened together.

[0020] This spring-reset electric actuator is an automated actuator that integrates electric drive and spring reset functions. It mainly consists of an electric drive unit (including a servo motor and gears), a spring reset mechanism (spring and energy storage components), a transmission mechanism (gear / rack), a control unit (sensor and controller), and a housing.

[0021] Working principle: Under normal operating conditions, the servo motor drives the reducer (gear 1 and gear 2), which in turn drives the push rod via the transmission mechanism, thereby pushing the load (e.g., pushing a valve switch). Simultaneously, the compression / tension spring stores energy. When power is lost, a fault occurs, or a reset signal is received, the servo motor loses power, the spring releases its stored energy, and the spring pushes the pressure plate upward. The pressure plate then drives the push rod upward, which in turn drives the rack guide rail upward. Through the aforementioned transmission mechanism, the push rod automatically retracts and resets to the preset initial position (usually closed or open). At this time, the rack drives the gears to reverse direction. Both gear 1 and gear 2 are spur gears.

Claims

1. A spring-return type electric actuator, comprising a housing, and a servo motor and a push rod mounted within the housing, characterized in that: The output shaft of the servo motor is connected to gear one, gear one meshes with gear two, gear two meshes with rack guide rail, and rack guide rail is fixed at the beginning of the push rod. The servo motor drives the push rod to extend and retract through gear one, gear two, and rack guide rail. The push rod is connected to the valve stem of the valve through a connector. A stroke pointer is installed on the connector, and a stroke scale is installed on the inside of the protective bracket. The stroke pointer corresponds to the stroke scale.

2. The spring-reset electric actuator according to claim 1, characterized in that: A cylindrical compression spring is fitted in the middle of the push rod. The spring is located inside the outer shell. A pressure plate is fixedly installed on the push rod. The pressure plate is used to compress the spring. One end of the spring pushes against the pressure plate, and the other end of the spring pushes against the inside of the outer shell. When the push rod extends, it compresses the spring. The spring rebounds and pushes against the pressure plate to drive the push rod to retract.

3. The spring-return electric actuator according to claim 1, characterized in that: A cable connector is installed on the outside of the housing, and the servo motor's wires are led out of the housing through the cable connector.

4. The spring-return electric actuator according to claim 1, characterized in that: A protective bracket is installed at the lower end of the outer casing, the lower part of the push rod is located inside the protective bracket, and the end of the push rod is connected to the valve.

5. The spring-reset electric actuator according to claim 1, characterized in that: The diameter of gear one is smaller than the diameter of gear two, and gear one and gear two together form a reducer structure.

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