In industrial scenarios such as thermal power denitrification, chemical reaction towers, and water supply and drainage pipelines, valves often require long-distance linear drive or constant thrust control. Linear electric actuators, with their structural characteristics of "linear reciprocating drive", have become the core control equipment in such scenarios. Unlike the rotary drive of angular displacement actuators, it converts electrical energy into linear displacement to achieve precise opening, closing, and adjustment of valves such as gate valves and globe valves. Especially in terms of long-range control and thrust output stability, linear electric actuators have significant advantages through their mechanical structure and control technology, providing reliable guarantees for process control under complex working conditions.

In terms of long-range control,Direct stroke electric actuatorThrough the combination of "multi-stage transmission+stroke feedback" technology, precise control over a large displacement range is achieved. Its travel range can cover from 50mm to over 1000mm, which can meet the long-distance driving requirements of large gate valves, air doors and other equipment. For example, in the control of flue gas baffles in thermal power boilers, the baffles need to be driven to complete a linear travel of 800mm to adjust the flue gas flow. The linear actuator can smoothly convert the motor's rotational motion into linear motion through a multi-stage transmission structure of turbine worm and screw, ensuring that the entire travel is free of jamming. At the same time, the equipment is equipped with a high-precision absolute value encoder, with a travel detection accuracy of up to 0.1mm, which can provide real-time feedback on displacement position. Combined with PID adjustment algorithm, it achieves precise position control within a long travel range, avoiding positioning deviation caused by long travel.

The stability of thrust output is the core competitiveness of linear electric actuators, which ensures constant thrust output through the design of "rigid transmission+overload protection". Its thrust output range ranges from 5kN to 500kN. For scenarios such as high-pressure globe valves that require high thrust drive, the actuator adopts a high-strength alloy screw and nut structure, with a transmission efficiency of over 90%. It can stably convert motor torque into linear thrust and maintain constant thrust in the fully closed position of the valve, effectively preventing medium leakage. To avoid equipment damage caused by thrust overload, the actuator is equipped with a built-in thrust sensor and intelligent protection module. When the thrust exceeds the set threshold (such as 110% of the rated thrust), it immediately triggers shutdown or reverse action. In the valve control of chemical high-pressure pipelines, it can effectively prevent damage to the valve sealing surface due to overload.

On the basis of long stroke and stable thrust, the straight stroke electric actuator has also improved its adaptability to complex working conditions through structural optimization. For high-temperature working conditions (such as hot air valve control in the metallurgical industry), the actuator adopts an isolated heat dissipation structure to separate the motor from the high-temperature area, ensuring stable thrust output even when the ambient temperature is ≤ 150 ℃; In dusty and humid mining water supply and drainage scenarios, the equipment's IP67 protection level can effectively resist harsh environmental erosion, and the dust cover design at the screw part can prevent dust from entering the transmission mechanism, extending its service life. Some models also support dual closed-loop control of thrust and stroke. During long stroke driving, the thrust can be dynamically adjusted according to changes in valve resistance, ensuring smooth driving and avoiding energy waste.

In terms of control mode, the adaptability of linear electric actuators further enhances their application advantages. For municipal water supply and drainage pipelines that require remote monitoring, the actuator supports communication protocols such as 4-20mA analog and Modbus, enabling remote control and data feedback for long-distance driving; In chemical scenarios that require emergency shutdown, the quick response function of the actuator (full stroke response time ≤ 10 seconds) can meet emergency control requirements. In addition, its modular design makes maintenance more convenient, and core components such as screws and sensors can be disassembled and replaced separately, reducing operation and maintenance costs.

The long stroke control accuracy and thrust stability of linear electric actuators stem from the deep optimization of transmission structure and control technology. From long-distance drive of large gate valves, to constant thrust control of high-pressure valves, and to stable operation under harsh working conditions, its performance characteristics meet the core requirements of linear drive scenarios. By accurately matching the operating parameters (such as stroke length, rated thrust, medium temperature, etc.) to select the appropriate model, the performance advantages of the equipment can be fully utilized, and the stability and safety of the process flow can be improved, providing solid support for automation control in thermal power, chemical, municipal and other fields.