Jaw crusher bearing-Causes and solutions of excessive temperature Bearing is the most important part of the jaw crusher. It is easy to cause failure and damage the bearing under high temperature. The following is the reason and solution of the high temperature of the jaw crusher bearing explained by Red Star Heavy Industry. 1. The crusher bearing is worn or the cage is damaged, etc.: Check the wearing parts of the mechanical equipment in time and replace the worn bearings.
2. The axial movement of the adapter bushing: remove the bearing cover on the frame, lock the adapter bushing and remove the flywheel or groove wheel, and replace with a new adapter bushing. 3. The position of the counterweight of the flywheel of the crusher is out of alignment, and the frame jumps: the position of the counterweight of the flywheel is adjusted to ensure that the position is not offset. 4. Crusher bearing oil hole is clogged, oil can not be added: clean oil hole, oil groove blockage. 5. The crusher bearing has oil cut-off or too much oil injection: When the user is operating the equipment, please read the instructions carefully, and add oil on time according to the instructions.
6. Non-crusher bearing heating: friction heat generated by the movable jaw seal sleeve and the end cover or the double-embedded cover of the housing bearing seat rotates together with the main shaft to generate friction and heat. In this case, the end cover and sealing sleeve of the jaw crusher should be replaced, or the upper bearing cover of the hot end of the frame bearing seat should be loosened, and the fuse and the embedded cover should be pressed into the groove of the frame bearing seat, and then the upper bearing should be fixed. Cover to eliminate the rotation of the embedded cover.
During the production process of the jaw crusher, the phenomenon of substandard output will reduce the production efficiency, and the substandard output is not necessarily a problem of equipment quality, or it may be caused by faults in production. Here is to introduce What are the reasons for the phenomenon of compliance, and how to solve the problem.
Cause one: The hardness or toughness of the processed material exceeds the equipment requirements. This phenomenon refers to the phenomenon that the nature of the input material exceeds the processing range of the jaw crusher, which increases the difficulty of production and then reduces the production capacity. The solution is to replace or increase the jaw crusher;
Cause two: The motor wiring is incorrect. There are three main manifestations: the motor wiring position is reversed, the host is driven in reverse (the jaw rotates clockwise), and the triangle connection of the motor is connected to the star connection. These methods make the jaw broken. The machine cannot work normally, so its production capacity is reduced. The solution is to correct the motor wiring;
Cause three: The discharge port is less than the specified limit, so the processed material cannot be discharged in time, which not only causes a decline in production capacity, but also easily causes blockages. The solution at this time is to adjust the discharge port so that Within the scope of the instructions;
Cause four: The displacement of the jaw plate, the phenomenon that the tooth top is opposite to the tooth top will also cause the decline of the jaw crusher production capacity. At this time, the solution is to check the tooth plate size. If it does not meet the standard, the jaw plate needs to be replaced. In addition, it is necessary to adjust the relative position of the fixed jaw plate and the movable jaw plate to ensure that the top of the tooth is fixed to the root of the tooth, and to prevent the displacement, so as to ensure the smooth production process of the equipment;
Reason five: The voltage at the work site is too low. For the jaw crusher, the production process relies on the drive of the voltage. If the voltage is too low, the equipment cannot be put into normal working state, and the production capacity cannot be achieved at this time. Meet the expected requirements, the solution at this time is to increase the working site voltage to adapt to the host's heavy load requirements;
Cause six: The gap between the moving jaw and the bearing is too large, which causes the bearing outer ring to rotate relatively. For the jaw crusher, the processing of the material is actually the assisting effect between different parts. If the gap between the jaw and the bearing is too large, then the cooperation between different parts is not good, and the expected production capacity cannot be achieved. The solution at this time is to replace the bearing or the movable jaw;
The above mainly introduces the reasons for the failure of the jaw crusher production capacity. First, it analyzes the harm of the failure phenomenon-the decline in production efficiency, and then introduces the reasons for the failure. The introduction of each reason is more detailed, and specific solutions are also given. Only by solving the phenomenon that the production capacity does not meet the standard, can the production efficiency be guaranteed.
The jaw crusher is mainly composed of a frame, a movable jaw assembly, a movable jaw, a fixed jaw, a triangular wheel, a flywheel, a bracket, a side guard, a discharge port adjusting device and a driving device. Because of its simple structure, easy manufacture, reliable operation and convenient maintenance, it has been widely used in crushing operations in metallurgy, chemical industry and mining industries.
In the jaw crusher, the ore is crushed and reduced to the required particle size. When the moving plate moves away from the fixed plate, the ore is sliding down freely from the upper portion of the crushing chamber to the discharge port under the action of gravity. During this process, the ore slides down along the surface of the jaw plate and causes sliding friction which makes the jaw plate be worn. Therefore, the abrasive wear is an important wear type caused by the squeezed ore.
When the ore is squeezed and ground under the huge mechanical force of the jaw plate, it is easy to form hard sharp edges and corners, and continual interaction between ore and the jaw plate makes the surface of the jaw plate appear very deep scratches, dense grooves and large-area deep pits. As a result, under the strong chiseling action, the jaw plate develops plastic deformation, metal rheology, brittle fracture and spalling, causing the material of jaw plate continuously to migrate and lose, and gradually become thinner. Therefore, chiseling wear is the main form of wear.
Jaw crusher has a large crushing force and fast running speed. Under the action of the huge impact and crushing stress, it withstands long-term and periodic contact fatigue load and is prone to fatigue crack. Therefore, fatigue spalling is also one of the causes of wear.
In order to protect the environment and improve working conditions, a water spray facility is installed on the site of the jaw crusher for dust suppression. At the same time, the water directly contacts the raft which accelerates the oxidation and corrosion of the raft and causes corrosion and wear of the raft.
The wear of the jaw plate presents complexity and diversity and is affected by factors such as materials, abrasives, environmental media, and relative motion. The value of the moving motion is usually reduced to solve the wear problems. In recent years, with the rapid development of computer technology, software simulation is used to comprehensively consider various factors that cause wear, and dynamically imitate of the crushing movement of the jaw plate, so as to more comprehensively analyze the wear rules of the jaw plate and finally reduce its wear rate.
In addition to the wear problem of the jaw plate, there are many other problems caused by parts and components can not be ignored. Next, we will introduce the failure analysis and troubleshooting of the jaw crusher.
4Check the tooth gap size of the tooth plate. If it does not meet the standard, the jaw plate must be replaced, and the relative position of the fixed jaw plate and the movable jaw plate should be adjusted to ensure that the tooth top is fixedly pressed against the tooth root to prevent displacement.
6It is non-bearing temperature rising, but the sealing sleeve of the movable jaw rubs with the end cap, which causes friction heating, or the double embedded cover of the frame bearing seat and the spindle rotate together, causing friction and heat.
6Replace the end cap and the sealing sleeve, or loosen the upper bearing cap of the end of the frame bearing housing which is overheated, press the fuse and the insert cover into the bearing housing groove, and then fix the bearing cover to eliminate the cover rotation.
Correct operation, reasonable and regular maintenance, accurate and timely judgment and elimination of possible faults are very important for jaw crusher operation. Here we will check eight common faults and solutions in the operation of jaw crusher.
(2) The impact sound in the thrust plate support or the gasket adjusting device is generally caused by the elastic loss or damage of the pull rod buffer spring, or the spring is not pressed tightly to cause rotation. When the movable jaw plate, elbow plate and jaw crusher body are not tightly combined, which makes the elbow head and the supports at both ends collide, or the adjusting gaskets collide with each other, the compression nut shall be tightened in time until the impact sound disappears.
This problem is often caused by loose side lining plate and toothed plate (moving and fixed) of crushing chamber, or loosening and fracture of fastening screws, which should be tightened or replaced in time.
Because the back bracket of jaw crusher not only has the function of transmission, but also plays the role of safety with the characteristics of low strength. Because the strength of the middle part of the jaw crusher elbow is too low, its own strength cant offset the crushing force produced by crushing ore.
The reason is that the tension rod spring pressure of the rear elbow is too large, and the excessive crushing force may cause the overload and fracture of the rear elbow plate. In order to solve this problem, it is necessary to adjust the pressure strength of the spring according to the production situation.
This problem is caused by the pull rod and pull rod spring of jaw crusher are damaged. At the same time, if the elbow plate has been detached from the support slider, the lining plate may break or even fall off, and jaw crusher will be unable to run normally.
Repair and treatment should be carried out according to different problems, for example, the elbow plate is broken, the pull rod or pull rod spring is damaged, and the elbow plate slips due to pull rod nut tripping, replacement should be done in time. The production can be continued only after inspection and test.
This situation is mostly caused by belt pulley or flywheel key damaged or loose. As a result, the rotation of the wheel and shaft is not synchronous. If the problem is found, tighten or replace the relevant parts of jaw crusher.
This problem is mostly caused by the serious wear of jaw crushing plate lining. In order to solve this problem, it is necessary to change the tooth adjusting plate up and down, or to replace the lining plate, and adjust the ore discharge port to meet the required size.
The problem may be caused that the bearing bush is pressed too tightly, and the amount of pressing degree of the bearing bush can be adjusted by the gasket. Or the lubricating oil is insufficient, the lubricating oil circuit is blocked, and the lubricating oil is dirty. At this time, the lubricating oil quantity shall be increased, the oil pipe shall be cleaned and the lubricating oil shall be replaced.