During the operation of the elevator spindle, problems such as temperature rise often occur. Once the temperature is too high, it will cause unnecessary damage to the body. Therefore, controlling the temperature has become an important issue. The main reasons for the temperature rise are the following factors: insufficient lubrication of the spindle, too viscous lubricating oil, and processing and installation of the spindle. These factors will cause the bearing temperature to rise.
1: The composition of the cooling system:
The elevator bearing automatic induction cooling device uses thermal resistance to measure the temperature of the measuring point, and uses a multi-channel digital instrument to display the temperature value of the bearing. PLC realizes the functions of parameter setting, remote monitoring, data storage and alarm processing.
2：The impact of bearing temperature is too high:
Excessive bearing temperature will cause material expansion, resulting in smaller mechanical clearances and resulting in noise and mechanical damage. The elevator can use the measurement method to monitor the elevator bearing temperature. By measuring the temperature rise of the elevator bearing in operation, we can know whether the bearing is normal. The bearing temperature is generally limited to a temperature increase of no more than 45 °C. If the temperature of the bearing is found to exceed 70-80 °C during monitoring, it should be stopped immediately for inspection.
3. Working principle:
1） In the actual programming process, there is no need to write a program for reading and writing PLC registers. By means of data definition, after defining I/O variables, the variable names can be used directly for system control, operation display, data logging and alarming Wait. The system sets a start button to start the control program, and sets red and green indicator lights to display the temperature status. The temperature of the 4 measuring points is within the required range, and the green light is on, indicating that the spindle can operate normally.
2） When the temperature of a measured point reaches the upper limit, even if the spindle speed has not reached the requirement, the red light will be on, and the corresponding bearing on the display of the numerical control system will give an alarm. The operator stops the main shaft immediately, and checks the condition of the corresponding position of the bearing according to the corresponding alarm number, so as to avoid the phenomenon of bearing grinding. Modern PLC has the remarkable characteristics of strong function, high integration, strong anti-interference ability, flexible configuration and stable work, and is widely used in the automatic control of modern industry. PLC can expand some intelligent control modules to form different control systems.
