Sandvik Cone Crusher main shaft

Detailed Introduction to the Main Shaft of Cone Crusher The main shaft of the cone crusher is a very important part. It has the following types: 1. Stepped shafts with cylindrical surface fits with the cone, such as domestic, former Soviet Union, G-type crushers, Symons standard and 600 short head crushers. 2. Non-stepped shafts with cylindrical surface fits with the cone, such as rotary disc crushers and Symons short head crushers. 3. Main shafts with conical surface fits with the cone, such as AC bottom single-cylinder hydraulic cone crushers and top single-cylinder hydraulic cone crushers from Kurimoto Tekko of Japan. The structure of the main shaft part usually includes the following: 1. The cone is equipped with a movable cone liner. Plastic fillers are cast between the liner and the cone, and the liner is compressed from the top downward by the main shaft nut through the gas cutting ring. When disassembling the movable cone liner, the gas cutting ring can be cut open with oxygen to facilitate the disassembly. 2. The part where the upper end of the main shaft cooperates with the beam bushing is equipped with a main shaft bushing to protect the main shaft from wear. During the working process of the crusher, the movement of the main shaft is equivalent to a rotary motion around a fixed point. The position of this "fixed point" is determined by two factors: one is the spherical radius of the main shaft thrust bearing; the other is the spatial position of the main shaft thrust bearing. Changes in the spherical radius or the lifting of the main shaft will cause the "fixed point" to move to a new position along the center line of the beam. Considering the translation of the middle disk, it can be seen that the "fixed point" is actually moving in a circular motion around the center line of the beam. To accommodate this movement, the inner surface of the beam bushing is usually designed in a sand funnel shape. However, the main shaft may fracture. The main reasons include: 1. Due to the crusher's long-term exposure to frequent mechanical shocks, the main shaft suffers from fatigue damage. 2. Excessive feeding leads to the equipment operating beyond its capacity. 3. Waste metals mixed in the ore during the mining and transportation process enter the crusher, causing frequent over-iron situations, and frequent impacts on components such as the main shaft, resulting in fatigue damage to the main shaft. This is the main cause of main shaft fractures. 4. The fragments from the fracture of other components, such as the transmission shaft, transmission gear, and eccentric sleeve, enter the crusher, damaging or even breaking the transmission gear, thereby increasing the pressure on the main shaft and causing it to fracture. To prevent main shaft fractures, the following measures can be taken: 1. On-site maintenance personnel should recycle the discarded components replaced and place them in the designated location. It is strictly prohibited to randomly discard all kinds of metal waste in the ore. 2. When maintenance personnel in the beneficiation workshop repair the equipment, they must strictly follow the operating procedures and avoid leaving maintenance tools and sundries in the equipment. 3. Improve the ability of the metal detector to detect and remove metals. 4. Operators guarding the feeding belt of the crusher should enhance their sense of responsibility, increase the inspection of the materials, and promptly pick out foreign objects. 5. Operators of the crusher should inspect the equipment in a timely and adequate manner. If any abnormal conditions such as current and sound are found, they should handle and report them promptly to prevent the expansion of the accident. 6. Regularly use ultrasonic and other instruments to conduct flaw detection on stressed components such as the main shaft to understand the actual condition of the equipment. 7. Strengthen the training of operators in each section, improve their actual operation level, intensify equipment maintenance, and conduct major and medium repairs of the equipment in a timely manner to ensure that the equipment is in a good technical condition. 8. Do a good job in the procurement of inventory spare parts for important equipment components such as the main shaft and body to avoid the entire system being shut down due to special circumstances.