Structure analysis of European version of jaw crusher (4)
The structure of the jaw crusher is relatively simple, mainly composed of a frame, a working mechanism, a transmission mechanism, a regulating device, a safety device and a lubrication system. Take the 900mm×1200mm simple pendulum jaw crusher as an example to briefly introduce its structure.
6. Lubrication system
Small jaw crushers generally use rolling bearings, while large and medium jaw crushers generally use sliding bearings with babbitt bushes. Usually the main bearing and connecting rod head bushes are cooled by circulating water when they are overheated. The friction parts of the crusher are lubricated with thin oil or dry oil. The bearings of the eccentric shaft and the connecting rod head adopt the gear hydraulic pump to press in the thin oil for centralized circulation lubrication. The supporting pads of the movable jaw bearing and the liner seat are lubricated by the manual dry oil lubricating gun and pressed into the dry oil regularly.
The structure of the compound pendulum type jaw crusher (picture 3 above) is similar to that of the simple pendulum type, except that the connecting rod, the rear thrust plate and the movable jaw spindle are reduced, and the mechanism is simpler. Since the moving trajectory of the moving jaw is not a reciprocating swing centered on the moving jaw mandrel, it is a very complicated trajectory, so it is called a compound pendulum type jaw crusher. The movable jaw 11 is directly suspended on the eccentric shaft 10 through roller bearings, and the lower part is supported by the thrust plate 5.
When the motor drives the eccentric shaft 10 to rotate through the V-belt wheel 13, the movable jaw makes periodic and complex swings on the fixed jaw. The discharge gap of the compound pendulum jaw crusher is adjusted by an inclined iron adjusting device. Compared with the simple pendulum jaw crusher, the compound pendulum jaw crusher has the advantage of simpler and more compact structure;
The bearings of the movable jaw and the frame adopt rolling bearings, which have low friction, convenient starting and simple lubrication; in addition, the upper horizontal stroke of the movable jaw is large, which can meet the compression required when the ore is crushed, and the movable jaw moves downwards to promote the displacement Because of the role of the mine, its productivity is about 30% higher than that of the simple pendulum type. Since 1980, the compound pendulum type fine crushing jaw crusher series have been developed and produced in China.
The disadvantage of the compound pendulum jaw crusher is that the vertical stroke of the movable jaw is large, which speeds up the wear of the crushing plate and aggravates the over-crushing phenomenon of the product, thereby increasing non-productive energy consumption. In order to overcome the above shortcomings, Beijing Research Institute of Metallurgical Equipment has successfully developed a new type of energy-saving crusher-JC jaw crusher based on the digestion of foreign “Kue-Ken” jaw crushers (Figure 7) The equipment has the following characteristics.
(1) A frictionless crushing mechanism is adopted. During the crushing process, the jaw plate acts as a pure squeezing force on the material without relative sliding. Therefore, the service life of the jaw plate is 5-10 times longer than that of the compound pendulum jaw crusher.
(2) The crushing cavity adopts a variable tooth angle curve cavity shape, and the full cavity crushing is realized by rationally designing the tooth angle and length of each part of the cavity shape, which improves the passing capacity of the crusher and ensures that the crushing granularity of the crusher is uniform.
(3) Simple and practical multifunctional mechanical, hydraulic and electrical protection systems are adopted. When the crusher is overloaded, the mechanical protection safety clutch quickly disengages the main shaft and the pulley of the crusher, causing the crusher to run idly, and at the same time, an alarm is issued. Once the overload is released, it can be quickly reset without replacing any parts. In addition, when an abnormal situation occurs in the crusher (such as failure of the lubrication system, damage to the main components, etc.), the multi-function protection system can quickly cut off the power supply, stop the crusher, and issue an alarm at the same time. This greatly improves the safety and reliability of the crusher.
(4) The adjustment of the discharge opening only needs to adjust the front and rear positions of the fixed jaw, without changing the position of the movable jaw. Therefore, the adjustment is very convenient and time-saving, and the geometry and size of the thrust mechanism are always kept stable.
(5) The main moving parts of the crusher, such as front and rear thrust plates, thrust plate spindles, connecting rod eccentric shafts, bearings and spindles are all lubricated with fully enclosed thin oil, and the sealing effect is good. Lubricating oil has the dual functions of lubrication and heat dissipation.
(6) The whole machine adopts a welded structure, which is light in weight, good in strength, and easy to manufacture and maintain.
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