Why does the vibrating screen not convey material?
As a commonly used screening equipment in industrial production, the operating status of vibrating screens directly affects production efficiency. Recently, there has been a lot of discussion on the entire network about the problem of vibrating screens not conveying materials. This article will combine the hot topics and user feedback in the past 10 days to analyze the common reasons why the vibrating screen does not convey material, and provide structured data for reference.
1. Analysis of common causes
According to the summary of industrial forums and maintenance cases, the main reasons why the vibrating screen does not discharge materials can be divided into the following five categories:
| Fault type | Proportion | Typical performance |
|---|---|---|
| Motor failure | 32% | Insufficient vibration amplitude or no vibration at all |
| Screen clogged | 28% | Material accumulates at the feed port |
| Abnormal installation angle | 18% | Material flow direction deviation |
| Vibrator failure | 15% | Abnormal noise accompanied by weakened vibration |
| Changes in material properties | 7% | Sudden increase in humidity/viscosity |
2. Solutions to high-frequency problems
In response to the above problems, maintenance personnel summarized the following countermeasures:
| Fault type | Solutions | Tool requirements |
|---|---|---|
| Screen clogged | 1. Stop the machine and clean the screen 2. Check the automatic cleaning device 3. Adjust the moisture content of materials | Wire brush/high pressure air gun |
| Motor failure | 1. Check the power supply voltage 2. Measure the motor winding resistance 3. Replace damaged bearings | Multimeter/Bearing Puller |
| Abnormal installation angle | 1. Calibrate using a level 2. Adjust the height of the support spring 3. Check the anchor bolts | Electronic level/wrench set |
3. Preventive maintenance suggestions
According to a technical white paper provided by the device manufacturer, the following precautions are recommended:
1.daily inspection: Check the screen tension at each shift change to ensure it is within the range of 35-50N/mm²
2.Weekly maintenance: To measure the motor current fluctuation, the three-phase unbalance should be <5%.
3.Monthly maintenance: Clean the dust inside the exciter and add grease to 2/3 of the cavity volume.
4.quarterly calibration: Use a vibration tester to detect the amplitude. If the deviation exceeds 0.5mm, the counterweight needs to be adjusted.
4. Sharing of special cases
A typical case encountered by a mining company recently: the vibrating screen suddenly stopped feeding material, and the inspection found thatMaterial viscosity is too highlead to. The specific data comparison is as follows:
| parameter | normal value | Failure time |
|---|---|---|
| Material moisture content | 8-12% | 18% |
| Screen surface temperature | normal temperature | 62℃ |
| Vibration acceleration | 4.5-5.2g | 3.8g |
The company added a hot air drying device to control the moisture content of the material within the standard range, and the equipment resumed normal operation.
5. Technology development trends
The intelligent vibrating screen solutions displayed at recent industry exhibitions are worthy of attention:
1.AI early warning system: Predict bearing failures 3-7 days in advance through vibration spectrum analysis
2.self cleaning screen: Using nano coating technology to reduce the adhesion rate of sticky materials by 40%
3.Frequency conversion adjustment: Automatically adjust the vibration frequency according to material characteristics (adjustment range 5-25Hz)
To sum up, the problem of the vibrating screen not conveying material needs to be comprehensively judged based on the equipment status and material characteristics. It is recommended that enterprises establish a complete inspection system and pay attention to the efficiency improvements brought by intelligent transformation.
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