As a level switch used for solid material detection, the resistance rotary level switch works by connecting the blades to a clutch through a transmission shaft and using a micro motor as a driving device to continuously rotate the blades. When the blades come into contact with the material, the resistance force generated between the blades and the material overcomes the sensitivity and adjusts the tension of the tension spring to open it. At this time, the motor stops rotating and the detection device outputs a switch signal; When the material drops below the blade, the resistance generated between the blade and the material disappears, the sensitivity adjustment tension spring returns to its original state, and the motor drives the blade to continue running normally again.

If the resistance rotary level switch malfunctions during operation, it will affect the smooth progress of production. Below is a brief analysis of common faults and causes of resistive rotary level switches:

Common fault phenomenon one: When the material is not submerged in the blades, an alarm output occurs.

Root cause analysis:

① Dust or debris entering the bearing can cause the transmission shaft to jam and generate an output alarm.

② The impact of materials causes the transmission shaft to deform and bend, resulting in the transmission system getting stuck and generating an alarm output.

Common fault phenomenon 2: When the material is submerged in the blade, there is no alarm output.

Root cause analysis:

① The motor has been running for a long time and has been damaged, causing it to stop running.

② The sensitivity adjustment of the tension spring is too strong, causing the resistance between the blade and the material to be less than the tension of the tension spring, which prevents the motor from stopping.

③ The blade form does not match the material density, and the resistance generated between the blade and the material is less than the tension of the sensitivity adjustment tension spring, which prevents the motor from stopping.

In response to the common faults and their causes mentioned above, the R&D engineers of Liaoyang Huite Instrument Co., Ltd. have been striving for excellence in the design of transmission components, motor selection, and overall sealing design, and have taken various targeted measures to fundamentally avoid the occurrence of the above faults.