working principle
As far as jaw crushers are concerned, although the types of structures are different, their working principles are basically similar, except that the moving trajectories are different. In summary, when the movable jaws periodically reciprocate the fixed jaw around the suspension axis, and sometimes move away when it is close to the fixed jaw, the ore between the two jaws is close to the fixed jaw. It is crushed by the combined action of crushing, splitting and bending. When the movable jaw leaves the fixed jaw, the broken ore is discharged by gravity through the discharge port of the crusher.
Single pendulum principle
The cymbal is suspended on the mandrel and can be swung left and right. When the eccentric shaft rotates, the connecting rod reciprocates up and down, and the two thrust plates are also driven to reciprocate, thereby pushing the movable cymbal to reciprocate left and right to achieve crushing and unloading. This type of crusher adopts a crank double-bar linkage mechanism. Although it has a large crushing reaction force on the moving jaw, but its eccentric shaft and connecting rod are not stressed, so the industrial is mostly made into a mainframe and a medium-sized machine. To break the hard material. In addition, when the crusher is working, the motion trajectory of each point on the moving cymbal is an arc centered on the mandrel, and the radius of the arc is equal to the distance from the point to the axis, the upper end arc is small, and the lower end arc is large. The crushing efficiency is low, and the crushing ratio is generally 3-6. Because of the simple movement track, it is called a simple swing jaw crusher.
The simple pendulum jaw crusher has a compact and simple structure, and the transmission parts such as the eccentric shaft are less stressed; because the vertical displacement of the moving jaw is small, the material is less excessively broken during processing, and the wear of the movable jaw is small.
Complex pendulum principle
The upper end of the movable cymbal is directly suspended on the eccentric shaft, and the connecting rod as the crank connecting rod mechanism is directly driven by the eccentricity of the eccentric shaft, and the lower end of the movable cymbal is hinged to the thrust plate to support the rear wall of the frame. When the eccentric shaft rotates, the trajectory of each point on the moving cymbal is from the circumferential line of the suspension point (the radius is equal to the eccentricity), and gradually becomes elliptical downward. The lower the part, the more the ellipse is biased until the lower part and the thrust plate The connection point track is a circular line. Because the movement trajectory of each point on the moving cymbal is complicated, it is called a complex oscillating jaw crusher.
Compared with the simple pendulum type, the compound pendulum type jaw crusher has the advantages of lighter weight, less components, more compact structure, better filling in the crushing chamber, uniform crushing of the loaded material block, and lowering of the lower end of the jaw. Mandatory introduction of finished product discharge, so the productivity is higher, 20-30% higher than the productivity of the simple pendulum jaw crusher of the same specification; the material block has a large up and down tumble motion in the lower part of the movable jaw, which is easy to be in the shape of a cube. Unload
Broken ratio
The crushing ratio is an important evaluation index for measuring the jaw crusher. The crushing ratio of the jaw crusher is the ratio of the raw material size to the accuracy of the crushed product. It indicates the extent to which the raw material is reduced after the crushing. After the ore is broken, the particle size becomes smaller, and the ratio of the particle size before the ore is broken to the particle size after the crushing is called the crushing ratio. It represents the multiple of the particle size reduction after the ore is broken. The calculation method of the crushing ratio is as follows:
1 with a maximum particle size of the maximum particle size before crushing and the crushed ore to calculate the maximum particle size using this method of calculation method often beneficiation plant design, because the jaw crusher to a maximum particle size of ore to ore port width is determined according to the design 2
Ratio of the effective width of the feed port of the jaw crusher to the width of the discharge opening
Some jaw crushers, whose discharge size is not determined by the size of the discharge opening.
3 using the average particle size before and after crushing ore, also known as the average broken bit point
1. Low noise and less dust.
2. Its crushing ratio is large and the product size is uniform.
3. Simple structure, reliable work and low operating costs.
4. The lubrication system is safe and reliable, the parts are easy to replace, and the equipment maintenance is simple.
5. The crushing chamber is deep and there is no dead zone, which improves the feeding capacity and output.
6, equipment energy saving: single machine energy saving 15% ~ 30%, system energy saving more than double.
7. The adjustment range of the discharge opening is large, which can meet the requirements of different users.
advantage
1. Effectively solved the problem that the original limestone crusher has high operation rate and no maintenance time due to low output.
2. The crushing of large limestone can be completed, and the maximum crushing particle size is 1000*1200mm, which effectively solves the problem that the original “one side is limestone supply shortage, and a large amount of large limestone can not be used while being storedâ€.
3. The mixing uniformity of the two materials is good, and the amount of desulfurized limestone is greatly increased. The dosage can reach 60%, which effectively reduces the cost of raw materials.
4. Power consumption has declined. The electricity consumption of 1 ton of limestone is reduced by 1-2KWh/t, and the annual electricity cost can be saved by 100,000 yuan.
5, the scrap size is small, only 2-15mm effectively solves the problem that the original limestone has a large particle size, often blocking the slippery and even affecting the output of the mill.
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