The jaw crusher is simple or complex swinging, which is divided into simple pendulum type, compound pendulum type and integrated type. Large and medium jaw crushers are generally simple pendulum jaw crushers.
The angle between the movable jaw and the fixed jaw is called the angle of the jaw. Take the PE900×1200 jaw crusher as an example. The angle of the angle is 17°~24°. Generally, the angle of 23° is selected. The feeding granularity does not exceed 750mm. The discharge size is 95-165mm. The ore and stone pass through the feed port and are crushed by the impact plate. The reaction plate is crushed and has a reaction impact force F (depending on the size of the ore, the nature of the ore and the impact angle, the impact force) F is uncertain), according to the laws of mechanics, the impact force F of the broken ore is decomposed into an upward impact force F*sin23° (0.39F tensile stress on the pedestal) and a lateral impact force F*sin67° (transverse shear force 0.92) F), because the eccentric shaft speed is 180-220 rpm, the impact force is large and the vibration is frequent. According to the actual situation on the site, the vibration causes the following damage to the crusher equipment and foundation:
(1) Fragmentation damage of the secondary grouting layer;
(2) The anchor bolt is deformed and broken;
(3) The eccentric shaft and related components are damaged;
(4) Damage to other parts of the crusher.
Because the generation of vibration is determined by the inherent nature of the crusher, the vibration generated by it can only be reduced by systematic measures, and detailed and systematic treatment can be carried out from the place where damage and possible resonance may occur. Control the vibration to an acceptable range.
2, using rubber sheets and other modern new materials to reduce vibration
In order to reduce the vibration, when installing the equipment, a rubber sheet of not less than 10 mm thick should be placed between the crusher and the foundation as a cushioning material. After the secondary grouting cement is firm, tighten the anchor bolts. However, in use, due to the large impact vibration of the jaw crusher, the requirements of the foundation and the installation are high. Once there is a deviation in a certain link or a defect in the equipment parts itself, it will be unpredictable. failure. In order to solve this problem reasonably, the secondary grouting layer is completely cleaned, and at the same time, the level of the plane on the foundation is super flat, and the thick rubber sheet is used instead of the secondary grouting layer.
Because the discharge width of the PE900×1200 jaw crusher is about 120mm, the up and down vibration deformation △x=120×tg23°=50.9mm, and the thickness of the grouting layer is generally 25mm or more. Therefore, the rubber of 50~80mm thickness is selected. The plate (standard 600mm × 350mm × 80mm, 4 pieces, with holes) is used as the secondary grouting layer and the vibration damping layer. After 24 hours, it is fastened once, and then tightened once after 7 days. After the treatment, the equipment is operated for two years. Normal, there is no overhaul of the equipment as a whole, and the performance remains stable.
Rubber cloth performance requirements: specific gravity: 1.4 ~ 1.6, tearing force: 3.5 ~ 5.0MPa, elongation: 350 ~ 500%, hardness: 50 ~ 70, the use temperature -50 ° C ~ 80 ° C (according to the use of the environment ).
With the development of science and technology, you can try some new organic damping materials, such as hardwood backing, silicone products, nitrile rubber, acrylate, etc. These materials have good elasticity, can be well fitted with the contact surface, and easy to disassemble. However, the selection should pay attention to the ambient temperature and the degree of oil used in the field. At the same time, these new damping materials are not only used for vibration reduction of crushers, but also for vibration-generating machines such as vibrating screens.
China Wood Pellet Maker,Wood Pellet Production Line manufacturer, choose the high quality Wood Pellet Line ,Poplar Chips Pellet Making Line, etc.
4-6t/h Rubber wood pellet making line in Thailand
Straw Pellet Making Line
sludge pelletize
Products exported to Europe, South America and more than 180 countries. And in Malaysia, Poland, India, Hungary, Australia, Egypt and other countries set up a general agent, domestic and foreign users praise and favor.
Wood Pellet Line
Wood Pellet Maker,Wood Pellet Production Line,Wood Pellet Line,Poplar Chips Pellet Making Line
Shandong Yulong Machine Co.,Ltd , https://www.yulong.cc