explosion-proof electric actuator
The explosion-proof electric actuator can withstand the internal explosion of the flammable mixture that has entered the interior of the casing without damage, and will not ignite the gas formed by one or more gases or vapors through any joint surface or hole on the casing. Electrical equipment enclosures for external explosive atmospheres.
product structure
Power transmission
The power transmission of the actuator adopts a precision reduction mechanism composed of a bronze alloy worm wheel and an alloy steel worm. The worm wheel and worm run separately in grease, which is suitable for the ambient temperature difference and also improves the service life.
Motor
The motor adopts low inertia, high torque motor, which can quickly reach the peak torque after the motor starts, and there is almost no over-limit movement when not excited; there is a precise temperature sensor in the motor, and the over-temperature limit is set through the control system to avoid damage caused by overheating of the motor.
Terminal Box
The independent sealed terminal cavity can ensure the sealing integrity of the electrical part of the electric actuator during on-site wiring, while meeting the product explosion-proof requirements.
Shell anti- corrosion
The outer surface of the actuator is painted with a tough, strong-adhesion aluminum alloy metal paint, which has strong UV resistance, corrosion resistance and high fullness. It can comprehensively improve the service life and self-cleaning properties of the coating and is suitable for various harsh production environments.
Sealing
The actuator adopts a double-seal design structure to ensure that the actuator is waterproof and dustproof; the standard product protection level is IP67.
electrical and control
Human-machine interface LCD display
The LCD uses a graphic dot matrix and segment code LCD with background lighting to display torque, valve position, limit setting and other working states and alarms in Chinese, numbers and graphics, which can be clearly observed and set even at night. At the same time, it is equipped with two red and green LED valve position indicators, which have strong penetration even in harsh environments, allowing users to see the working status of the actuator at a glance.
Bus control function
The communication module adopts an independent structure superimposed on the mainboard to meet the needs of different communication media and different communication protocol systems. Currently supported communication protocols include ModbusRTU, PROFIBUS-DPV0/DPV1, HART, FF, DeviceNe (optional)
Infrared remote control function
The actuator uses infrared remote control technology, which allows human-machine dialogue through a sealed dialogue window without opening the actuator cover. Even in dangerous situations, the intrinsically safe remote control can safely set the parameters of the actuator.
Measurement and protection
Accurate torque measurement and protection
Professionally designed torque measurement system to ensure actuator overload protection and monitor valve torque changes in real time:
(Standard) Mechanical torque measurement: The traditional mechanical torque trigger mechanism has the advantages of being mature, stable and reliable. We have optimized and upgraded it based on the original torque, making the torque device more sensitive and greatly improving its service life.
(Optional) Electronic torque measurement: By detecting the real-time current, voltage and magnetic flux of the motor, and cooperating with the single-chip microcomputer for comprehensive calculation, accurate output torque is obtained to achieve continuous measurement; this system does not need to consider mechanical wear, which improves the reliability of the system.
Accurate valve position travel measurement and protection The actuator uses a 24-bit absolute encoder to measure the valve position travel, with a travel of 4096 turns and a single-turn angle resolution of 0.088°. The encoder is integrated with a magnetic motor. In the event of power loss, there is no need to worry about the loss of valve position when manually operating the actuator. The advanced boundary anti-jitter technology is used to ensure high-speed, stable and reliable output data, effectively improving the stability and reliability of the system.
Motor measurement and protection
Overheat: When the motor temperature exceeds the set overheat protection value, the motor is prohibited from running and the motor overheat alarm information is displayed.
Overload and short circuit: The circuit designed with precision voltage conversion chip meets the precision measurement of large-scale current changes: overload anti-delay characteristics and short-circuit protection meet relevant standards.
Instantaneous reversal protection: Using instantaneous reversal delay control technology, when the actuator receives a reverse operation signal during operation, the control system will first shut down, and then perform reverse action after a delay to prevent damage to mechanical transmission components.
Electronic brake: The regulating electric actuator uses dead zone setting and electronic brake to ensure that the valve stops at the set valve position.
Intelligent control safety protection
ESD protection: it provides flexible emergency protection function, and the emergency action control mode is set by parameters; the action mode during emergency protection can be set separately, such as full open, full close or hold position.
Control state protection: the operation, local or stop state can be locked by the mechanical lock on the cover of the electrical box to avoid misoperation; for changing parameter settings, you need to enter the password to enter the setting interface.
Passive monitoring function: it can accurately display valve position information in the case of power failure, and can realize the function of querying the actuator's running data without external power supply.
Intelligent network security protection (optional): supports dual redundant fieldbus communication. In the dual redundant communication mode, when one channel fails, the communication will automatically switch to another channel to ensure the normal communication and operation of the actuator.
Why is there an explosion?
Explosion is the sudden change of matter from one state to another state through physical or chemical changes, and the release of huge energy. The energy released at a rapid speed will cause the surrounding objects to suffer violent impact and damage. the Three conditions must be met for an explosion: explosive substance, oxygen, and ignition source. Objectively, many industrial sites meet the explosion conditions. When the mixed concentration of explosive substances and oxygen is within the explosion limit range, if there is an explosive source, an explosion will occur.
Preventing the generation of explosion must be considered from the above three necessary conditions, and limiting one of the necessary conditions limits the generation of explosion. Electrical equipment is also a potential source of ignition. When the machine is running, it will cause the surface temperature to rise, electrostatic discharge or electric sparks caused by instantaneous current. From the design point of view, flameproof electrical equipment can seal the ignited explosive mixture in a casing, which is particularly strong, can withstand the explosion pressure of the internal explosive mixture, and prevent the explosion of the explosive mixture outside the casing. Therefore, explosion-proof electrical equipment can be prevented from becoming a potential source of ignition.
The explosion-proof electric actuator produced by our company is designed to prevent internal sparks or explosion carriers from contacting the outside through the explosion-proof surface of the shell. The gap between the explosion-proof joint surface (≤0.15mm) and the large enough Face width (12.5mm-25mm) to ensure this. In addition, the joint surfaces of each component, such as the number of thread turns, thread accuracy, zero point, screw, between the finger window and the shell, the gap between the motor and the output port, the component and the component, and the wire port, etc., are all in accordance with the interval Design according to the requirements of the explosion, so as to ensure that the high pressure generated by the internal explosion will not damage the actuator.
Certificates
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