First, screen repair and replacement. The screen is manufactured by punching thin steel sheets or metal plates. When the screen becomes worn or damaged due to foreign objects, minor damage can be repaired using riveting or soldering. However, if the damage is extensive, it should be replaced with a new one. When installing the screens, ensure that the burr side faces inward and that the screen is tightly attached to the frame. For ring screens, the overlapping inner edge should follow the rotation direction to prevent material from jamming at the overlap.
Second, bearing lubrication and replacement. After every 300 hours of operation, the bearings should be cleaned. If oil lubrication is used, fill the bearing housing clearance to about one-third when adding new oil, but do not exceed half. Only a few caps of the cover-type oil cup should be tightened before operation. If the crusher's bearings are severely worn or damaged, they must be replaced promptly, and proper lubrication should be maintained. Tapered roller bearings should be checked for axial clearance, which should be kept between 0.2-0.4 mm. Adjustments can be made by adding or removing paper pads on the bearing cover as needed.
Third, replacement of claws and hammers. In the grinding section, the teeth and hammers are critical wear parts in the feed crusher and directly affect crushing quality and efficiency. These components must be replaced in a timely manner. When replacing the teeth on a jaw crusher, first remove the disc. Before doing so, open the locking tab on the back of the disc, use a hook wrench to loosen the round nut, and then use a special puller to extract the disc. To ensure the rotor runs smoothly, always replace the set of teeth together and perform a static balance test after replacement. When tightening the claws, make sure all nuts are properly fastened and never miss the spring washers. Select qualified parts when replacing the teeth, ensuring that the weight difference between individual teeth does not exceed 1.0-1.5 grams.
Some hammers in the hammer mill are symmetrical. If a sharp-angle hammer becomes dull, its angle can be adjusted on the opposite side. If both ends of the hammer are worn, flip it for continued use. When adjusting the angle or flipping the head, all hammers should be done simultaneously. Once all four corners of the hammers are worn, they should all be replaced. Note that the weight difference between each set of hammers should not exceed 5 grams. After installing the spindle, disc, positioning sleeve, pins, and hammers, a static balance test should be performed to ensure the rotor remains balanced and to avoid vibration. Additionally, due to wear on the fixed hammer pins and mounting pin shafts, the pin shafts may gradually wear down, causing the holes to enlarge. If the pin diameter decreases by 1 mm from the original size, or if the hole becomes larger than the original by 1 mm, the component should be repaired or replaced immediately to maintain performance and safety.
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