Jaw Crusher appeared in 1858. Although it is one of the oldest pieces of equipment, but due to the simple structure, reliable performance, easy to manufacture, easy maintenance, and other advantages, so still in the metallurgical and mining, building materials, chemical industry and railway sectors get widely. In metal mines, which are mostly used for hard or medium hard ores are coarsely chopped and shredded. Jaw Crusher is usually follow the moveable jaw plate (e) motion to classify, most widely used in the industry has two main types:
1, briefly swinging jaw double toggle mechanism (the so-called simple pendulum) of Jaw Crusher.
2, complex swing jaw single toggle mechanism (called a compound pendulum) of Jaw Crusher. Hydraulic technology applied in crushing equipment, hydraulic Jaw Crusher appeared.
(1) simple pendulum Jaw Crusher-(2)-a compound pendulum Jaw Crusher (3)-hydraulic Jaw Crusher.
Moveable jaw plate is moving with connecting rod, thrust plate bodies to achieve. It was by flywheel 7, 8 eccentric shaft, connecting rods 9, former thrust and thrust plate 13. When through the pulley of the motor drives eccentric shaft rotates, the connecting rod motion. Connecting rod moves up and down, driving thrust plate movement. As a result of movements are constantly changing the tilt angle of the thrust plate, and the moveable jaw plate around suspension shafts for reciprocating motion, thus crushing ore. When move jaw forward swing, horizontal lever spring gets balanced jaw and the inertial forces of the thrust plate, jaw thrust plate and combination will not be separated. When the jaw back, spring assist role to play.
Flywheel because of Jaw Crusher is stopped working, working and idle stroke, so it did not balance the load on the motor. For the load evenly, would occur in the jaw is moved backward (away from the fixed jaw plate), the energy stored up idle stroke in order to work trips (for crushing ore), the energy is released again. Using the principle of inertia, on both ends of the eccentric shaft and installation of a flywheel can achieve this objective. In order to simplify the structure of machine, usually for transmitting power using one of the flywheels and pulleys. For two motor-driven major Jaw Crusher, two flywheel pulley, pulley and take off wheel.
Eccentric shaft or spindle crusher is an important part of it is, simple pendulum Jaw Crusher jaw suspension shafts and spindles. Eccentric shaft is driven up and down movement of the connecting rod main parts, due to the large crushing force on their work, and are generally made of high quality steel production. According to China resources, large Jaw Crusher of the eccentric shaft using manganese-molybdenum-vanadium, boron and manganese-molybdenum-chromium-molybdenum alloy steel is appropriate. Small Jaw Crusher is manufactured using the 45th steel. Eccentric shaft should be quenched and tempered or normalized heat treatment to improve the strength and wear resistance. Steel spindle general use of 45th.
Link only the simple pendulum Jaw Crusher has, it is composed by the connecting rod and crank end. Due to work under tension, it made with steel. There is overall and combinations of the two connecting rods, which for many medium and small Jaw Crusher, which is mainly used for large Jaw Crusher. In order to reduce the inertia effect of the connecting rod, should seek to reduce the weight of connecting rods, so, small Jaw Crusher used in “work” or “ten”-shaped cross section structure and large Jaw Crusher used box-section form. Hydraulic Jaw Crusher, Rod body is also equipped with a hydraulic cylinder (plunger), insurance role in when the machine is overloaded.
Adjustment device it was Crusher discharge size adjustment mechanism. With the broken tooth plate wear, increase discharge opening, broken grain becomes thicker. In order to guarantee the product size requirements, you must use equipment, periodic adjustment of the discharge opening size.
Jaw Crusher discharge opening adjustment method, there are three main forms:
1 and shim adjustment. In the thrust bearing between the posterior wall of the rack and into a group of equal thickness of gasket. Use to increase or reduce the number of spacer layer, making Crusher discharge opening decreases or increases. This approach can be multiple adjustments, machine structure compact, you can reduce the weight of equipment, but must pay parking. Large Jaw Crusher used this method of adjustment.
2, wedge adjustments. With thrust bearing between the posterior wall of the rack and the two realized the wedges relative Crusher discharge opening adjustment. Turn the nut on the bolt and adjustment wedges along the back wall of the rack up or down move, drives wedges before “moving forward or backward, so as to promote or jaw thrust plate, for the purpose of discharge opening adjustment. This method can achieve the stepless adjustment, easy to adjust, to save time, do not stop adjustment, but increasing the size and weight of the machine. Medium and small Jaw Crusher often use the adjusting device.
3, hydraulic adjustment: 2012 years where there is installed to adjust the discharge opening of the hydraulic cylinder, Jaw Crusher hydraulic safety device, which is reliable and secure, and easy to troubleshoot. The crusher is equipped with a hydraulic cylinder and piston on the connecting rod, cylinder connected with the upper part of the connecting rod, piston and bearing thrust plate convergence. Normal working hours, with pressure in the fuel tank of oil, the piston rod and cylinder is equivalent to a whole. When entering the crushing Chamber the broken objects, connecting rod stress increases rapidly, the oil pressure suddenly increased in the fuel tank, opened the valve for fluid flow, being squeezed out of the pressure oil, the piston and the cylinder release. At this point, connecting rod cylinder while still moving up and down with the rotation of the eccentric shaft, connecting rod-piston fixed, so the thrust plate and moving jaw does not swing, play the role of safety device. With the development of hydraulic technology, this Crusher will be widely used.
Worth noting is that head of the connecting rod bolt or PIN on the flywheel (keys), as Jaw Crusher safety device is not appropriate. Jaw Crusher jaw broken for short, the series has broken than large, equal product granularity, simple structure, reliable operation, easy maintenance, low operation cost and so on. Jaw Crusher (broken jaw) is widely used in mining, metallurgical, building material, highway, railway, water conservancy, chemical industry and other departments, no more than 320 MPA compressive strength of various materials.