Heavy Crusher

Q1: The crushing efficiency of the heavy crusher suddenly decreases, and the size of the crushed plastic materials is uneven. What might be the reasons and how to solve it?

A1: There are 4 main reasons: ① Its blade edges become dull after long-term use, failing to cut plastic materials effectively; ② Its screen holes are blocked by sticky plastic residues or fine particles, which prevents qualified plastic particles from being discharged; ③ The feeding speed is too fast, so plastic materials are not fully cut in the crushing chamber; ④ Its motor belt is loose or the power voltage is unstable, leading to insufficient blade rotation speed.

Solutions: First, check the blades—slightly worn ones can be sharpened for repair, while severely worn ones should be replaced with matching parts. Then, clean the screen (use a high-pressure air gun or special solvent to remove sticky plastic residues). Next, adjust the feeding rhythm to avoid overloading. Finally, check the tightness of the motor belt and calibrate the power supply voltage (it must meet the equipment’s rated value).

Q2: The heavy crusher makes harsh abnormal noises or has obvious vibration during operation. What issues should be checked?

A2: Focus on checking 4 aspects: ① Its blades are installed incorrectly, or the gap between the blades and the fixed knife set is improper (too large/too small), causing collision during operation; ② Its anchor bolts are loose, making the machine body unstable and resulting in vibration; ③ Hard objects such as metals and stones are mixed into the crushing chamber and collide with the blades; ④ Its motor bearings lack lubrication or are worn.

Solutions: After stopping the equipment, calibrate the position and gap of the blades. Tighten the anchor bolts with a wrench. Cut off the power and clean the hard objects in the chamber (plastic materials must be screened before feeding in subsequent operations). Add special lubricating grease to the motor bearings, and replace the bearings if they are severely worn.

Q3: The heavy crusher’s feed inlet is frequently blocked, and plastic materials cannot go down. How to deal with this?

A3: First, identify the causes of blockage: ① The plastic material humidity is too high (e.g., plastic films absorb moisture and stick together) or the material size is too large, exceeding the applicable range of the feed inlet; ② Plastic materials in the crushing chamber are not discharged in time, causing "reverse blockage" at the feed inlet; ③ The guide plate at the feed inlet is deformed, which hinders the downward sliding of plastic materials.

Solutions: Dry the wet plastic materials first, and pre-cut large-sized materials to meet the feed requirement. Run the equipment idly to discharge the accumulated materials in the chamber before resuming feeding. Straighten or replace the deformed guide plate of the feed inlet, and ensure the inclination angle is conducive to material sliding (usually 30°-45°).

Q4: The heavy crusher’s motor frequently trips due to overload, and the equipment cannot start or suddenly stops during operation. How to solve this?

A4: First, analyze the reasons for tripping: ① The single feeding amount is too large, exceeding the rated load of the motor; ② Hard objects mixed into the chamber get stuck in the blades, causing a sudden increase in motor load; ③ The motor wiring is loose, the cable is short-circuited, or the electrical components are faulty; ④ The motor winding is burned out, or the thermal relay parameters are set incorrectly.

Solutions: Reduce the feeding amount and adopt the "small amount and multiple times" feeding method. Cut off the power, clean the stuck materials in the chamber, and check the motor wiring—replace aging cables if necessary. Verify the thermal relay parameters (they must match the motor’s rated current). Use a megohmmeter to test the motor winding—if the insulation resistance is lower than 0.5MΩ, the winding needs to be repaired or the motor replaced.