Asynchronous explosion motor for coal mine underground, with a motor power of 37kW and a voltage of 380V.Our company also refers to it as the YBX4 explosion-proof motor.
I. Key advantages
The safety and reliability adapts to the methane environment underground in coal mines, as well as the energy-saving and economic benefits of long-term operation. YBX4 explosion-proof motor can be matched with the power requirements of medium and light load equipment.
ExdI is a special certification level for Class I explosion-proof environment (presence of methane gas) in coal mines. The motor casing adopts an explosion-proof structure, which can limit the internal electric sparks and high temperatures that may be generated inside the casing, eliminate the risk of igniting external methane mixtures, and comply with the mandatory requirements of the Coal Mine Safety Regulations for underground electrical equipment.
This specification of the explosion-proof motor is usually equipped with IP54/IP55 protection level, which can effectively block the invasion of coal dust and water splashing in coal mines, avoid motor overheating caused by dust accumulation or internal short circuit caused by water vapor, and adapt to harsh working conditions such as humidity and dust underground.
II. Practical examples
Mr. Wang, 55, stared at the newly replaced motor in the transportation lane and touched the "YBX4 explosion-proof motor 37kW 380V" on the shell with his finger - this is the equipment specially selected by the coal mine to solve the hidden dangers of the old belt conveyor.
As a thirty year underground transport worker, he is well aware of the risks here: 1500 tons of coal pass through the transport lane every day, and the damp environment is filled with coal dust and occasional scattered methane, which cannot tolerate any sparks from the motor.
The previous 22kW old motor had a buzzing noise when it started, which could overshadow the prompt sound of the methane detector. The belt conveyor kept shaking and coal often scattered all over the floor. What's even more worrying is that after running for two hours, the outer shell is scorching hot. Especially in summer, a sunshade needs to be set up to cool down. During maintenance, the end caps and bearings have be removed and replaced, and the two of them have to tinker for a long time to complete the task. When conducting research at the mine, it was calculated that the old motor runs for 16 hours a day, and with electricity and maintenance costs, it costs nearly ten thousand yuan more per year. This time, when choosing YBX4, technician Xiao Li explained to him with a parameter table that the 37kW power just matches the full load requirement of the belt conveyor, and the 380V voltage is suitable for the underground power supply system, without the need for additional line changes; The asynchronous explosion motor level is specifically designed for the methane environment in coal mines. The outer shell can completely lock in any sparks that may be generated inside, ensuring safety even when the methane concentration reaches a critical value; The IE4 ultra-high efficiency standard significantly reduces copper and iron losses compared to old motors, resulting in a 10 degree drop in temperature rise and only a slight warmth sensation when touched.
Mr. Wang was squatting next to the motor to observe when the methane detector at the end of the alley suddenly beeped - a little methane floated over from the neighboring mining face. He was about to pull the emergency stop brake, but he saw the motor was still running smoothly and the coal blocks on the belt conveyor remained motionless. Xiao Li's "explosion-proof protection" has now become the most tangible sense of security.
Later, he deliberately calculated the energy-saving account: at an electricity price of 0.8 yuan/kWh, this asynchronous explosion motor saves 2 kWh of electricity per day compared to the old motor, which is 730 kWh per year. If the entire mine were replaced, the saved money could add two sets of methane monitoring equipment. Even more worry free is maintenance. The split end cap does not require dismantling the entire machine, and the oil injection hole on the bearing can be directly lubricated. It can be maintained in half an hour by one person, and there is no need to spend the whole night with old colleagues for maintenance.
Ⅲ.Technical parameters of YBX4 advantages from traditional ones
|
Parameter |
YBX4 Series ExdI Flameproof Motor |
Traditional Flameproof Motor |
|
Explosion-Proof Grade |
ExdI, suitable for coal mine underground environments with methane explosive gas mixtures |
Generally ExdII (for factories and similar sites); some can be customized to ExdI for coal mines, but with less targeted design than YBX4 |
|
Energy Efficiency Grade |
Complies with Level 2 efficiency in GB18613-2020, meeting IE4 efficiency class |
Mostly IE2 or IE3 efficiency class, with relatively lower efficiency |
|
IP Rating |
Typically IP55, effectively preventing coal dust and moisture ingress |
Generally IP54 or lower, with relatively weaker protection performance |
|
Insulation Class |
Class F, with stator winding temperature rise assessed by 80K |
Mostly Class B or Class F, but the temperature rise assessment standard may be less strict than that of YBX4 |
|
Starting Torque |
Up to 1.8 times the rated torque or more, adaptable to load changes |
Generally smaller starting torque, may require additional starting equipment |
|
Operating Efficiency |
For the 37kW model, operating efficiency is 3%-5% higher than that of traditional IE2 flameproof motors |
Lower efficiency and higher energy consumption |
|
Noise Level |
Typically ≤85dB, with low vibration and noise during operation |
Relatively higher noise, which may have a greater impact on the working environment |
|
Service Life |
Adopting high-quality materials and advanced design, service life can reach 8-10 years |
Generally 5-6 years, with relatively shorter service life |
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