Cone crushers are generally used in the second and third stages of crushing, and are widely used in the medium and fine crushing operations of various hard minerals and rocks. The two most common failures of cone crushers are "stuffy car" and "speeding car". The so-called "stuffy car" refers to the sudden shutdown of the main cone crusher during operation, commonly known as "stuffy car". The "speeding" phenomenon refers to the instability of the cone crusher's moving cone, the body vibrates instantly, the safety spring or safety cylinder is in an abnormal working state, the working current increases instantly, and the oil return temperature rises sharply. These two common faults have a great impact on the smooth progress of production operations. Therefore, it is necessary to carry out a specific analysis of the causes of the cone crusher's stuffiness and speeding failure, and formulate reasonable maintenance measures according to the actual situation, so as to effectively improve the work efficiency of the cone crusher. Today, I will take you to understand the causes and solutions of "stuffy cars" and "speeding cars".

1. Causes and solutions of "boring cars":

1. Reason: The discharge port is blocked due to the stuffy car. In the production process of cone crushing, too much or uneven feeding will cause the discharge port to be blocked, causing the cone crusher production load to be too large and the fuse to break, which leads to downtime.

Solution: Before starting the machine, check whether the discharge port of the cone crusher is blocked by residues. If so, clean it up immediately, and pay attention to control the feeding evenly, not too much or too little.

2. Reason: The belt is too loose. Cone crushing is driven by the belt. If the belt rotating in the driving groove is too loose, the belt will slip, which cannot provide enough power for the normal operation of the machine, causing the cone crusher to stop suddenly.

Solution: Check whether the belt tightness is appropriate, and adjust it reasonably to prevent it from being too tight or too loose.

3. Reason: The voltage is too low or too high. When the voltage at the construction site is unstable or too low, it is easy to force the cone crusher to self-protect and cause the machine to stop. Therefore, the operator must check whether the voltage is normal before starting the machine.

Solution: Pay attention to the voltage situation and maintain the stability of the voltage.

4. Reason: The eccentric shaft is stuck. When the eccentric shaft tightening bushing loosens or falls off, there is no gap on both sides of the bearing seat of the frame. The eccentric shaft is stuck and cannot rotate normally, which will cause a cone breaker. Suddenly shut down, a "stuffy car" situation appeared.

Solution: Pay attention to the position of the eccentric bearing sleeve to prevent jamming.

5. Reason: The bearing is damaged. The bearing is a very important part in cone crushing, which is used to reduce the friction coefficient in the working process. If the bearing is damaged, other crushing parts will not work properly, causing the cone crusher to stop suddenly.

Solution: Pay attention to daily maintenance. Bearings are extremely important, and lubrication must be done to reduce wear.

2. Causes of "speeding" and solutions:

1. Reason: When the gap between the copper sleeve and the main shaft is not suitable for assembly, the gap between the copper sleeve and the main shaft will be too large or too small, which will affect the cone crusher. When the clearance is too large, the cone sleeve and the main shaft will collide, and the moving cone will oscillate violently, causing the body to vibrate strongly. If the clearance is too small, the lubricating oil in the contact area between the copper sleeve and the main shaft may be reduced or drained, and the lubricating oil film cannot be formed or the thickness of the oil film is insufficient, causing "speeding".

Solution: Ensure that the main shaft is in full contact with the cone sleeve, ensure the assembly gap between the inner and outer holes of the cone sleeve, and ensure that the main shaft and the cone sleeve are in contact along the full length (adding a backing plate on the spherical bearing housing can change the gap between the cone sleeve and the moving cone), The taper sleeve and the shaft sleeve must be fixed with molten zinc alloy to ensure that there is no relative movement between the two.

The gap between the main shaft of the cone crusher and the tapered bushing should meet the technical requirements. If the gap is too small, a gasket can be added between the spherical bearing frame and the annular contact surface of the body frame to make the crushing cone rise to change the main shaft and The clearance of the tapered bushing can meet the technical requirements.

2. Reason: When the cone sleeve is overloaded and the cone sleeve is running, non-broken objects enter the crushing cavity (over iron), resulting in excessive load, causing the zinc filling of the fixed cone sleeve to fall off, causing the cone sleeve to move up, between the main shaft and the cone sleeve The gap becomes smaller, forming a "shaft holding", the main shaft will follow the eccentric sleeve to rotate quickly and "speeding".

Solution: The gap between the main shaft of the cone crusher and the tapered bushing should meet the technical requirements. If the gap is too small, a gasket can be added between the annular contact surface of the spherical bearing frame and the body frame to make the crushing cone rise. Change the gap between the main shaft and the tapered bushing to meet the technical requirements.

3. Reason: Poor lubrication. Due to the failure of the dust-proof device or the inadequate sealing, part of the dust in the crushing cavity enters the lubricating oil path, resulting in various lubrication parts (between the bottom of the crushing cone and the spherical bearing, between the moving cone and the eccentric sleeve, The lubrication between the large and small bevel gears, between the horizontal shaft and the sleeve) is poor, causing friction. The oil temperature of the lubrication system continues to rise. When the temperature is close to or higher than 55, the viscosity of the oil decreases, and the oil film in the ball bush cannot be effectively formed, causing the phenomenon of "speeding".

Solution: Choose lubricating oil carefully: When choosing lubricating oil, you should choose strictly in accordance with the requirements of the number of equipment, to ensure that the indicators and standards are in compliance, especially the viscosity and fluidity. To ensure the grease standard of the lubricating oil, deteriorated or dirty oil quality will accelerate the gear and wear the sleeve.