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Analysis on the Problem of Return Material of Jaw Crusher

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When the jaw crusher is working, the material to be broken is not squeezed by the movable jaw plate and the fixed jaw plate, but is squeezed out by the two jaw plates and flies out from the feed port. This is the phenomenon of returning materials when the jaw crusher works, that is, the phenomenon that materials are squeezed out of the feeding port. Regarding the analysis of the return material of the jaw crusher, we analyze it from the following two points.

 

1. The reason for the phenomenon of returning material: When the jaw crusher is working, the material is crushed in the crushing cavity under the pressure of the two jaw plates;Therefore, the phenomenon of returning materials is related to the force of materials. The direct cause of the phenomenon of returning material is that the angle between the two jaws is greater than twice the friction angle, so that the material and the jaws cannot generate enough friction to overcome the upward component of the crushing force,the material being squeezed out under the action of vertical upward force, slides towards the feed inlet.

 

2. Factors leading to the phenomenon of material return: When the jaw crusher is working, whether the material return phenomenon can be generated should be considered from the angle of the jaw plate and the friction angle between the material and the jaw plate. Then, we analyze the factors that lead to the phenomenon of returning materials from the following four points:

 

1)In the processing and assembly of the parts of the jaw crusher, some dimensions related to the included angle, such as the length and thickness of the jaw plate, the length of the bracket, the bracket angle, and the size of the cavity of the frame, etc. If the size of the drawing design is not in conformity, when the included angle increases, the phenomenon of reversal may occur.

 

2)For the jaw crusher of the same specification, the discharge opening is adjusted to different sizes, and the angle is also different.Unreasonable adjustment of the width of the discharge opening can also lead to the phenomenon of material return.

 

3)The cross-sections of the movable jaw plate and the fixed jaw plate are designed to be toothed. The purpose is to increase the friction coefficient between the material and the jaw plate, so that it can meet the conditions of the included angle as much as possible, resulting in the phenomenon of material return, and the wear is more The more severe, the greater the possibility of returning the material.

 

4)When the size of the material to be broken by the jaw crusher is very different, for the jaw crusher, the condition of the included angle has been met.However, when working, a large piece of material is jammed between two small pieces of material, and the phenomenon of material return may also occur.

 

As a supplier with nearly 30 years' manufacturing, Shuguang Heavy Machinery also produces and sells hammer crushers, impact crushers, vertical shaft crushers, cone crushers, compound crushers, Raymond mills, high pressure mills. Powder machine, vertical mill, ultra-fine grinding machine, ball mill, double-shaft shredder and other heavy equipment crusher. Feel free to contact us for more details.

 

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