Expert Analysis: Reasons and Solutions for Jaw Crusher Returns
Let's first analyze the return phenomenon of jaw crusher:
Cause Analysis
1. The problem of the device itself
The jaw crusher parts do not conform to the drawing dimensions, such as the length and thickness of the jaw plate, the length and angle of the bracket plate, the size of the inner cavity of the frame, etc. are not standard, resulting in inferior machinery. After long-term use, the angle between the two jaws exceeds twice the friction angle, so that there is no sufficient friction between the material and the jaws to overcome the upward force of the crushing force, and the material is extruded under the influence of the vertical upward force. , slide to the direction of the feed port.
2. Unbalanced force on crushed materials
Under the action of the upper and lower force on the movable jaw, the vertical force of the material to be broken in the crushing cavity is easily unbalanced, and under the action of the upward component force, the phenomenon of material return is prone to occur.
3. The width of the discharge opening is too large
Many outsiders believe that the wider the discharge opening of the jaw crusher, the better. In fact, the larger the width of the discharge opening of the same specification of jaw crusher, the more likely the phenomenon of material return will occur. During the crushing process, the material is in direct contact with the jaw plate, resulting in friction. The more severely worn the jaw plate, the greater the possibility of material return.
4. The size of the material to be broken varies greatly
Generally speaking, the feeding size of jaw crusher is similar, so as to ensure uniform feeding, and when the size of the material to be broken is very different, it is easy to return the material.
Solution
1. According to the material conditions, use the crusher of the appropriate specification.
2. When the jaw plate is worn and the material is returned, the jaw plate should be repaired or replaced in time.
3. Screening is carried out when the particle size of the material is too different. The coarse jaw crusher is used for preprocessing, and then the fine jaw crusher is used for finishing, which can meet the processing requirements of the material.
4. Add a wedge-shaped backing plate at the joint surface of the movable jaw and the movable jaw to reduce the angle between the two jaws and make it meet the friction angle where the angle between the two jaws is less than twice, eliminating the return of material Phenomenon.
5. A guard plate can be welded above the feeding port of the jaw crusher to prevent the material from flying out of the feeding port and endangering the operator's personal safety.
What's the matter with the jaw crusher if it doesn't cut material?
1. The humidity of the object to be broken is relatively high
When the jaw crusher encounters materials with a large surface moisture, or when the crushed materials are mixed with mud, it is very easy to jam the materials, so that the minerals cannot come down, and the ore is blocked in the cavity after crushing. The phenomenon.
2. Too much material at one time or too fast feeding speed
During the operation of the equipment, if the feeding amount is too fast and uneven, it is easy to cause too much material in the lower cavity of the jaw crusher, blocking the discharge port, and then the phenomenon of unloading occurs.
3. There are raw materials such as iron blocks that cannot be broken (or the hardness of the material to be broken is too large)
If the raw materials such as iron blocks are not picked out when adding raw materials, it will cause certain damage to the jaw plate of the jaw crusher, thus affecting the blanking.
4. Installation error
If the connection position of the motor is reversed, the main engine rotates the moving jaw clockwise, or the delta connection of the motor is connected to a star connection, etc.
5. Low voltage in the workplace
The voltage is too low to provide the power required for the normal operation of the host, resulting in too slow or even unloading.
Workaround
1. Check from the source, pre-screen the materials that need to be crushed, and filter those materials that do not meet the crushing requirements, such as iron blocks.
2. Do the steps of pre-screening, ore washing, and ore blending to control moisture before crushing, so as to ensure the dryness and purity of the material to be crushed (remove dust and dust). If there is still a situation that the material is stuck and cannot be discharged during the crushing process, it is necessary to take measures to reduce the speed of the main shaft and increase the discharge port, but when adjusting the discharge port, the adjustment angle cannot be too flat.
3. Because the crushing requirements of different models and specifications of jaw crushers (such as: feeding and discharging particle size, crushing capacity, etc.) are different, it is recommended that users must understand the selected equipment in advance What are the basic requirements for the material of the model jaw crusher, etc.
4. Strictly follow the operating instructions. The operators must undergo strict training and can only take up jobs after passing the test.
5. Increase the voltage of the work site to adapt to the heavy load requirements of the host.
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