The quick-freezing machine is mainly used to quickly freeze various foods. The quick-freezing machine mainly consists of continuous mesh belt, feeding and discharging cage, mesh belt supporting guide rail, motor and reducer, tensioning mechanism, nylon guide wheel and other main parts. . Its working principle is: the feeding and discharging tumbler rotates in one direction under the drive of the motor and reducer, the front tumbler mesh belt support guide rail is upward at a certain angle, and the rear tumbler net belt support guide rail is downward at a certain angle. And the opening of the mesh belt link is towards the rear, so the mesh belt can only slide on the guide rail in one direction. Nylon vertical strips are evenly distributed on the curved surface of the inner cage (the green vertical direction in the figure). After the drive motor is started, the mesh belt at the upper and lower ends of each cage is tightened so that the mesh belt shrinks inward (radially) to hold the cage tightly. , because nylon vertical strips are evenly distributed on the surface of the tumbler, after the tumbler rotates, the mesh belt slides along the supporting guide rail under the action of friction, so that the front tumbler net belt slides upward along the support guide rail, and the rear tumbler net belt slides upward along the support guide rail. Sliding down along the supporting guide rail, the front and rear mesh belts form a cycle under the action of the tensioning mechanism. The material enters the spiral upward from the entrance of the front cage on the mesh belt, and spirals downward to the outlet after reaching the rear cage. Under the action of the evaporator The material forms a freeze. What needs to be explained here is: the mesh belt and the rotating cage, the mesh belt and the guide rail are all rolling friction, and the friction force of the rotating cage makes the rotating cage move. This friction force should not be too large and should not be too small. The relative sliding of the cage becomes smaller, the net belt of the front rotor cage is tighter, and the upper end is easy to turn over. If it is too small, the relative sliding between the mesh belt and the tumbler will become larger, and the tightness of the mesh belt to the tumbler will become smaller. During operation, the mesh belt will appear to be stuck, and even the mesh belt may accumulate. Moves outward (radially outward along the rail) and slides out of the rail, causing the belt to seize.
Common faults and key maintenance techniques
1. The mesh belt does not rotate, the motor heats up seriously, the inverter alarms, and the circuit breaker trips
This is one of the most serious problems after the long-term operation of the quick-freezing machine. After the problem occurs, the stator coil of the motor is burned, and the mesh belt turns over. Frequent tripping. According to the analysis of the above problems, it can be seen that when the motor is running under severe overload, it is easier to heat up at low speed and high torque, and it is an inevitable result to burn the motor coil when the current is too large.
Post time: Feb-10-2023