Cone Crusher Countershaft Box
What is the cone crusher countershaft box?
A countershaft box is a component of a cone crusher that is located on the frame of the crusher. The countershaft box houses the shaft that connects the crushing cone to the main drive mechanism. The shaft transmits power from the motor to the crushing cone, and the countershaft box helps to support and stabilize the shaft.
The countershaft box typically includes an outer shell, an inner sleeve, a countershaft, bearings, and various seals and gaskets. The outer shell is typically made of cast steel and serves as a protective casing for the inner components. The inner sleeve is a cylindrical component that slides over the countershaft and provides a smooth surface for the bearings to rotate on.
The countershaft is the main drive shaft that connects the motor to the crushing cone. It typically runs through the center of the inner sleeve and is supported by bearings located inside the countershaft box. The bearings help to reduce friction and wear on the shaft and allow it to rotate smoothly.
Overall, the countershaft box is an essential component of a cone crusher, as it helps to transfer power from the motor to the crushing cone and provides support and stability for the shaft.
How to install the crusher countershaft box?
Procedures for assembling the various components are given in the MAINTENANCE portion of this section. If the countershaft box assembly was removed for shipment, the countershaft box is to be installed in the main frame as follows:
- Coat the large diameter O-ring (which can be found in one of the packing boxes) with clean grease and stretch it over the machined diameter at the pinion end of the countershaft box. This O-ring prevents oil leakage between the countershaft box and main frame.
- There is also a flexible, plastic-like wear ring that is to be installed in a groove on the countershaft box. The wear ring eliminates «fretting» that can occur between the countershaft box and main frame. This wear ring is split. Place the wear ring in the groove in the pinion end of the countershaft box and hold the ring in position by gluing each end of the split to the countershaft box. There may be a small gap at the split or one end may have to be trimmed to suit. If there is no glue available, then obtain a length of thin diameter wire, and wrap the wire around the wear ring and twist the ends of the wire together to hold the wear ring in place. Coat the wear ring with clean grease and proceed to Step 3. If a wire was used, remove it after the wear ring in the countershaft box has entered the bore of the main frame.
- Slide a long section of pipe over the sheave end of the countershaft to offset the much heavier pinion end of the assembly.
- With an overhead crane or other suitable lifting device, carefully position the countershaft box centering lug on the guide plate in the main frame and slide the assembly in as far as it will go.
- Insert the three special hex head jackscrews (found in the box with the tools) through the holes in the box flange, space 120° apart, and then thread into the tapped holes in the frame.
- The countershaft box has an interference fit between both flanges and the main frame. Alternately tighten each jackscrew a small amount, to prevent binding, until they have bottomed in the threaded holes in the frame.
- Remove the jackscrews and install washers or spacers between the head of the jackscrews and the flange. Again, alternately tighten each jackscrew a small amount until all have bottomed in the threaded holes.
- Remove the jackscrews and replace them with the regular hex head capscrews and lock washers that hold the box in the frame.
- Continue forcing the countershaft box into the frame by alternately tightening these capscrews until the box is tight against the frame at the outer flange.
- Place the countershaft box guard over the countershaft box and align the slots in the guard with the lugs on each side of the countershaft box.
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