Structure analysis of European version of jaw crusher (1)
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.
Jaw crusher structure
Jaw crushers have two types: integral frame and combined frame. The overall frame is generally welded by castings or steel parts. Domestic small and medium-sized crushers mostly use integral frames. The combined frame is made up of multiple pieces of cast iron or welded parts connected by pins or bolts, and is mainly used for large-scale jaw crushers that are difficult to transport (such as underground crushers) or difficult to manufacture.
2. Work organization
The working mechanism (ie, crushing cavity) of the jaw crusher is composed of a fixed jaw (ie, the front wall of the frame in Figure 1 above) and a movable jaw 5. Both jaw structures are lined with liner plates 2 and 6 made of manganese steel, and the liner plates are fixed on the jaw plates with bolts and wedges. Because it directly participates in the crushing, in order to improve the crushing effect, the surface of the liner has longitudinal corrugations, and the unevenness is opposite. At present, the tooth profile of the liner of the domestic jaw crusher is mostly triangular and trapezoidal.
The surface is vertical and straight. With the application and development of computers, the design of the tooth profile has been developed from the traditional test method and empirical method to the use of computer to optimize the design, so as to obtain a better crushing effect.
Because the wear of various parts of the liner is very uneven during crushing, especially the lower part near the discharge port is more severely worn. For this reason, the liner is generally made up and down symmetrical, especially after the lower part is worn, it is turned upside down to extend Its service life. The liner of the large crusher is composed of many pieces, each piece can be interchanged, and the purpose is to extend its service life.
The shape of the crushing cavity of the jaw crusher directly affects its productivity, product particle size composition, particle size, crushing plate service life and power consumption and other technical indicators. At present, most of the crushing chambers of large-scale jaw crushers produced in our country adopt the old-fashioned linear cavity shape with all teeth. This cavity shape has low productivity, high specific energy consumption, easy clogging, large and uneven product particle size. A lot of research work has been done on the crushing cavity in China, and new cavity shapes have been used in production.
Practice has proved that when the swing stroke and swing times of the movable jaw are the same, the curved cavity shape has the advantages of high productivity, large crushing ratio, uniform product size, less over-crushing, small wear of the liner at the lower end of the crushing cavity, and low specific energy consumption. .
3. Transmission mechanism
It is mainly composed of a pulley 10, an eccentric shaft 8, a connecting rod 9, and front and rear thrust plates 12, 13 and so on. The eccentric shaft is supported in the main bearing on the side wall of the frame. The upper part of the connecting rod is installed on the eccentric position of the eccentric shaft. When the motor drives the eccentric shaft to rotate, the connecting rod is driven to move up and down due to the eccentricity, thereby driving the thrust plate to move.
Since the thrust plate continuously changes its inclination angle during movement, it drives the movable jaw to periodically swing around the suspension eccentric shaft 8, thereby achieving the purpose of crushing the ore. In order to ensure that the movable jaw and the thrust plate are tightly integrated, a tensioning device composed of two pull rods 15 and two springs 16 is usually used. When the movable jaw swings, it can not only ensure that the movable jaw and the thrust plate will not separate, but also can partially balance the inertial force generated by the movable jaw and the thrust plate.
Since the jaw crusher works periodically, it will inevitably cause periodic changes in the load of the motor, resulting in a very unbalanced load. Therefore, large-scale crushers generally have a flywheel at each end of the eccentric shaft (one of the flywheels doubles as a belt wheel), and a flywheel for small and medium-sized crushers can be made. According to the principle of inertia, the crusher can store energy during the non-working stroke, and release it during the working stroke, thereby making the motor load uniform.
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