What are the differences between a simple pendulum jaw crusher and a compound pendulum jaw crusher?

Product introduction:https://www.lvssn.com/crusher/Jaw-crusher.html

Jaw crusher as a widely used primary crushing products, we use more is the compound pendulum jaw crusher, today I will take you to understand the simple pendulum jaw crusher and compound pendulum jaw crusher what is the difference?

 

1. How it works

 

1.1 simple pendulum jaw crusher

Crushing principle: movable jaw suspension on the heart axis, can make left and right oscillation, eccentric axis rotation, connecting rod do up and down reciprocating movement, drive two thrust plate also do reciprocating movement, thus promoting movable jaw do about reciprocating movement, to achieve crushing and unloading.

This moving jaw is a kind of about reciprocating movement, moving jaw on each point movement track is the center of the suspension axis arc line, the movement track is simple, so called simple pendulum jaw crusher.
 

1.2 compound pendulum jaw crusher

Principle of crushing: the motor drives the eccentric shaft to rotate through the belt and pulley, and the movable jaw makes periodic reciprocating movement around the eccentric shaft to the stationary jaw plate, sometimes close to and sometimes away from it. When the movable jaw plate is close to the stationary jaw plate, the ore between the two jaws is crushed, bent and split.When the movable jaw plate leaves the fixed jaw plate, the broken ore is discharged through the discharge port of the crusher under the action of gravity.

The movable jaw is directly suspended on the eccentric shaft. When the eccentric shaft rotates counterclockwise, it can directly drive the movable jaw to make complex oscillation.The movement track of the moving jaw from top to bottom: the movement track of the broken cavity is elliptical;In the middle of the crushing cavity, the movement track is a flatter oval.At the bottom of the crushing chamber, the movement track is almost reciprocating.Because the motion track of each point on the moving jaw is more complex, it is called complex oscillating jaw crusher.

Although they have different types of structures, they basically work in the same way, except that the movement of the jaw is different.

 

2. Comparison of advantages and disadvantages

 

2.1 simple pendulum jaw crusher

 

Advantage:

(1) compact and simple structure;

(2) eccentric shaft, connecting rod and other transmission parts of the force is small, industrial made of mainframe and medium-sized machine, used to break hard materials;

(3) less wear of movable jaw plate;

(4) the vertical stroke (vertical movement distance) of the moving jaw is small, the wear effect of the ore on the jaw plate is light, and the over-commination of the product is less.
 

Disadvantage:

(1) low crushing efficiency;

(2) more flake products.

 

2.2 compound pendulum jaw crusher

 

Advantage:

(1) lighter weight (about 20-30% lighter when the production capacity is equal), fewer components and more compact structure;

(2) the degree of filling in the crushing chamber is good, the packed material block is evenly broken, and the productivity is high, 20-30% higher than the simple pendulum type of the same specification;

(3) there are more finished products in the shape of cube with better quality.
 

Disadvantage:

The wear of jaw board is fast, the product is too crushed serious, the dust that produces is more also.

In the beginning, the double pendulum jaw crusher is generally made of small and medium-sized, because it is in the process of crushing ore, the moving jaw is subjected to huge extrusion pressure, and most of the action on the eccentric shaft and bearing above, resulting in the eccentric shaft and bearing stress deterioration, easy to damage.However, with the emergence of large impact bearing, compound pendulum jaw crusher is gradually becoming larger.

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What are the causes of holding the bearing of hammer crusher?

Product introduction:https://www.cementepc.net/crusher/Hammer-crusher.html

Hammer crusher bearing hold, is the bearing in the process of running a lot of heat, heat in a short time can not be scattered.Causes the bearing temperature to rise sharply, finally holds the bearing dead.This phenomenon is common in equipment overhaul and production service site.What are the causes of holding the bearing of hammer crusher?
 

1. Improper assembly

 

1.1 improper fit between bearing outer ring and bearing seat hole or bearing inner ring and shaft during assembly.

In the process of assembly, sometimes the inner hole of hammer crusher is not repaired, its size is measured, new bearing is replaced for assembly, and the temperature rise is found to be too high after test run.During the inspection, it is found that the bearing seat hole of hammer crusher has been deformed, which causes the outer ring of the bearing to be squeezed, resulting in the radial clearance of the bearing becoming smaller, the rolling body rotating unevenly and the wear becoming worse.The clearance between the bearing inner ring and the shaft is too large, and the bearing inner ring rotates with the rolling body and the shaft, resulting in heat and vibration of the bearing due to friction.
 

1.2 improper control of bearing heating temperature during assembly.

During the heating operation, if the temperature of bearing heater of the debugging hammer crusher is too high, the hardness and accuracy of it will be reduced due to tempering, thus the temperature of the bearing will rise, which will lead to further wear and damage of the bearing.
 

1.3 improper adjustment of bearing clearance of hammer crusher during assembly.

In the actual work, many installations sometimes only by hand debugging, clearance is too large or too small, can not meet the production needs.If the axial clearance of hammer crusher is too small, it is easy to cause bearing heating, accelerate pitting corrosion, and even make the rolling body stuck or glue damage;If the axial clearance is too large, the impact force of the moving pair will increase and the stiffness will decrease, which will lead to abnormal sound in operation, and even cause serious vibration or damage to the cage.

2. Oil seal problem

Oil seal is used to seal the rotary shaft of hammer crusher seal oil seal elements, and the cavity is basically static, so the oil seal is also known as rotary shaft lip seal ring.For the oil seal that takes pair lip, its pair lip rises dustproof effect, prevent impurity to invade, in order to prolong oil seal life, but pair lip place often is lubricated undesirable, frictional bigger, cause oil to seal dry attrition and damage, must fill grease between double lip when installing double lip oil seal so.
 

3. Gap problem

In the process of assembly, if the size of the spacer is not carefully checked and the assembly is tested, the temperature will rise rapidly after a certain period of time.The size of the outer ring of the bearing of hammer crusher has been determined by the end cover and the stop mouth of the bearing seat. The size of the spacer is reduced, and the size of the inner ring is adjusted by the round nut. Finally, it is pressed down, and the axial clearance of the bearing becomes smaller, which causes heat in the running process.

4. Lubrication problem

Bearing grease should not be too much, too much grease will increase the friction torque, hammer crusher bearing temperature rise;However, if the amount of fat is too little, the reliable lubrication cannot be obtained and dry friction occurs.Generally speaking, the appropriate amount of grease is 1/3 ~ 1/2 of the total void volume in the bearing, therefore, according to the requirements of use, regular injection of appropriate amount of grease.

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