The screening performance of a vibrating screen is influenced by various factors, including operational parameters, screen design, and material properties. Optimizing these factors can significantly improve screening efficiency and throughput. Here’s a breakdown:

Factors Affecting Screening Performance

1. Material Properties

Particle Size Distribution:

A wide size distribution may lead to reduced efficiency, as smaller particles can block the screen openings.

Particle Shape:

Irregularly shaped particles are less likely to pass through the screen compared to spherical particles.

Bulk Density:

High-density materials may require more energy for efficient separation.

Moisture Content:

Wet materials tend to clump together, reducing screening efficiency and causing screen blinding.

Material Flowability:

Poor flowability can lead to uneven distribution across the screen surface.

2. Screen Design

Screen Aperture Size and Shape:

Apertures that are too small or have an inappropriate shape can lead to clogging or poor separation.

Screen Inclination:

The angle of the screen affects the travel speed of the material and the likelihood of particles passing through the screen.

Number of Decks:

Multi-deck screens can separate materials into multiple size ranges but may decrease efficiency due to increased complexity.

Vibrating Frequency and Amplitude:

Higher frequencies and optimal amplitudes improve material stratification and throughput.

3. Operational Parameters

Feed Rate:

Excessive feed can overload the screen and reduce efficiency.

Material Distribution:

Uneven distribution across the screen surface decreases separation efficiency.

Vibration Direction and Pattern:

Linear, circular, or elliptical vibration patterns affect material movement and screening performance.

Screening Time:

Insufficient time for particles to pass through the screen results in lower efficiency.

4. Environmental Factors

Ambient Conditions:

High humidity or dust levels can affect material properties and the screen’s performance.

Operating Temperature:

Extreme temperatures can impact material behavior and machine performance.

5. Maintenance and Wear

Screen Surface Condition:

Worn or damaged screens reduce separation efficiency and may cause contamination.

Proper Tensioning:

Loose or improperly tensioned screens can lead to uneven vibrations and reduced efficiency.

Lubrication and Component Wear:

Poor lubrication or worn components (e.g., bearings) can negatively impact vibration consistency.

Tips to Improve Screening Performance

Optimize Screen Design:

Choose the right aperture size and shape for the material being screened.

Adjust the screen angle and vibration parameters to suit the application.

Control Material Properties:

Pre-dry or condition materials to reduce moisture and prevent clumping.

Implement pre-screening processes to remove oversized particles.

Regulate Operational Parameters:

Maintain consistent feed rates and ensure even material distribution.

Match vibration patterns to the material characteristics and screening requirements.

Regular Maintenance:

Inspect and replace worn screens and components.

Regularly clean screens to prevent clogging and blinding.

Use Auxiliary Equipment:

Install feeders or distributors to ensure uniform material flow.

Apply anti-clogging devices or ultrasonic technology to improve screening efficiency for fine or sticky materials.
By carefully considering and optimizing these factors, you can maximize the efficiency, accuracy, and throughput of vibrating screens in various applications.

Vibrating screen is a screening equipment widely used in mining, chemical, food and other industries. It classifies materials according to particle size through vibration. During the production process, the vibrating screen may not move diagonally, which usually means that the movement of materials on the screen surface is blocked, resulting in a decrease in screening efficiency. In order to ensure the smooth production process and stable product quality, it is crucial to understand the reasons why the vibrating screen does not move diagonally and take solutions.

1. What are the reasons for the vibrating screen not moving diagonally?

Screen blockage: After long-term use, the vibrating screen may be blocked due to the accumulation of materials, especially wet and sticky materials are more likely to adhere to the screen, hindering the flow of materials.

Improper screen surface inclination: If the screen surface inclination of the vibrating screen is not set properly, it may cause the material to move on the screen surface to slow down or even stagnate.

Vibration motor failure: The vibration motor is the power source of the vibrating screen. The failure or damage of the motor will directly affect the vibration effect of the screen surface, resulting in the inability of the material to flow normally.

Material humidity is too high: Materials with high humidity are easy to stick together, which will not only block the sieve holes, but also form a layer of sticky film on the screen surface, affecting the material’s screening.

The screen is damaged or the tension is not enough: A damaged screen or insufficient tension will cause the material to be unable to screen, and may even get stuck in the damaged part of the screen.

Uneven feeding: If the feeding device is unstable or the feeding amount is too large, it may cause uneven distribution of materials on the screen surface, affecting the flow and screening effect of the material.

2. Solutions to the problem of no diagonal material flow of the vibrating screen

Clean the screen: Clean the screen regularly, remove the blockage, and ensure that the screen holes are unobstructed. For wet and sticky materials, consider using heating or chemical methods to reduce the viscosity of the material.

Adjust the inclination of the screen surface: According to the nature of the material and the screening requirements, adjust the inclination of the screen surface appropriately to promote the flow and screening of the material.

Check and repair the vibration motor: Check the working status of the vibration motor regularly, repair or replace damaged parts in time to ensure the normal operation of the motor.

Control the humidity of materials: dry the materials before feeding, or adjust the production process to reduce the humidity of materials to reduce the adhesion of materials.

Replace or tighten the screen: check the integrity and tension of the screen, replace the damaged screen in time or re-tighten the screen to improve the screening efficiency.

Uniform feeding: optimize the feeding device to ensure uniform and stable feeding and avoid accumulation and blockage of materials on the screen surface.

It is a common problem in the production process that the vibrating screen does not move diagonally. By analyzing the possible reasons and taking corresponding solutions, the screening efficiency and stability of the vibrating screen can be improved.

Regular maintenance and reasonable operation are the key to ensure the normal operation of the vibrating screen. With the advancement of industrial technology, the optimization and improvement of the vibrating screen will further enhance its performance and meet the growing production needs.

Linear vibrating screen is very suitable for assembly line operation, and it has the advantages of low energy consumption, high output, and automatic discharge, which makes it less common in the mining industry. The general screening process is that the material enters the feed port of the equipment evenly from the feeder, and the screen produces the screened material and the screened material through the screen, which are discharged from their respective outlets. The linear vibrating screen also has different screening methods.

Linear vibrating screen screening method

1. Linear vibrating screen dry screening

The so-called linear vibrating screen dry screening, as the name suggests, is to calculate the sum of the screen residue and the screen bottom inventory of each screen and the difference between the total dry mass of the sample before screening, as the loss during screening, and calculate the loss rate, put a certain weight of powder sample in the screen, with the help of mechanical vibration or manual patting to make the fine powder pass through the screen until the screening is complete, and the screen residue of the powder sample is calculated according to the weight of the screen residue and the weight of the sample. When measuring the particle size distribution, dry screening is generally used.

2. Linear vibrating screen overlapping method screening

Overlapping method screening means that in the process from coarse screen to linear vibrating screen, the screen surface of the vibrating screen overlaps, the screen hole of the upper screen surface is larger, and the subsequent layers gradually decrease, because there are gaps on both sides of the linear screen frame, which may lead to screening accuracy. This screening method is simplified and suitable for the processing of a large number of materials

3. Linear vibrating screen wet screening

Linear vibrating screen wet screening is to place a certain weight of powder sample in the screen, and after being washed for a certain period of time by a suitable dispersed water flow (with a certain water pressure), the screening is complete. The wet screening method is to calculate the screen residue of the powder sample according to the weight of the screen residue and the weight of the sample. If the sample contains more water and the particles are more condensed, wet screening should be used (with higher accuracy than dry screening), especially for materials with finer particles. If it is allowed to mix with water, try to use the wet method. Because the wet method can prevent very fine particles from adhering to the screen holes and blocking the screen holes. In addition, the wet method is not affected by the material temperature and atmospheric humidity, and the wet method can also improve the operating conditions. Therefore, both the wet method and the dry method have been listed as standard methods and acted in parallel as a method for determining the fineness of cement and raw materials.

4. Screening by layered sequence method of linear vibrating screen

Generally speaking, the screening of multi-layer linear vibrating screen equipment is from coarse to fine, with a very thick screen at the top and decreasing downwards. The equipment is easy to repair and convenient for observing the working conditions of the screen surface of each layer of the equipment. In the coarse screen, the screen surface order is reversed. The shaft equipment and the vibrating screen can be discharged separately along the entire length of the screen surface, the screening effect is obvious, and the layers do not affect each other.

5. Screening by dry and wet combination method of linear vibrating screen

Screening by dry and wet combination method of linear vibrating screen is to combine the two methods and take the best from them. When the material contains more water and mud, and the materials are bonded to each other, the dry and wet combined screening method should be used, and the screening results are more accurate. The specific method is to first pour the sample into a fine-mesh sieve and screen it in a basin filled with water. Every 1 to 2 minutes, replace the water in the basin until the water in the basin is no longer turbid. The material on the screen is dried and weighed, and the mass of the washed fine mud is calculated based on the difference between the weighed mass and the mass of the original sample.

6. Linear vibrating screen coarse and fine combined screening method

In the combination process of linear vibrating screen coarse and fine combined screening, part of the screen surface is arranged from coarse to fine, and the other part is arranged from fine to coarse; In actual production, circular vibrating screens usually adopt coarse to fine or combined screening processes; Based on the special requirements of the screening material, the screening accuracy and trajectory of the circular vibrating screen are ideal, which is suitable for screening coarse ores.

In summary, there are six screening methods for linear vibrating screens, namely dry screening, wet screening, dry and wet combined screening, overlapping screening, layered sequence screening, and coarse and fine combined screening. These screening methods can meet the user’s screening requirements for different materials, and can also be applied to the screening of the same materials, but some special materials still need to find a suitable screening method. No matter what screening method is chosen, the material should be fed evenly, the particle size of the material should be adjusted, and the material should not be blocked by the screen.

Proper maintenance of a vibrating feeder ensures optimal performance, prolongs the equipment’s life, and minimizes downtime. Vibrating feeders are essential for moving materials smoothly and consistently, so here’s a guide to effective maintenance practices:

Vibrating feeder maintenance

1. Regular Inspections

Daily visual checks: Inspect for loose bolts, excessive wear, or cracks in the frame and support springs. Look for any signs of material buildup on the feeder pan that could impact vibration.

Check for abnormal vibrations: Listen for unusual sounds or vibrations that could indicate mechanical problems or unbalanced loads.

Inspect drive motor and belts: Check the drive motor and belts for signs of wear or alignment issues, as these can impact the feeder’s efficiency.

2. Lubricate Moving Parts

Follow lubrication schedule: Lubricate bearings, drive shafts, and any other moving parts according to the manufacturer’s guidelines. Over-lubrication or under-lubrication can cause mechanical issues.

Use recommended lubricants: Ensure you’re using the correct type and grade of lubricant for each component, as specified in the equipment manual.

3. Check and Adjust the Feeder’s Settings

Ensure proper vibration amplitude: Monitor and adjust the feeder’s amplitude settings if necessary to match the application requirements and material characteristics.

Calibrate the stroke: Regularly check and calibrate the stroke (the distance the feeder moves per cycle) to ensure it meets the required specifications.

Control feed rate: Maintain a steady and appropriate feed rate to prevent excessive wear and tear on the feeder pan and reduce potential overloads.

4. Inspect the Springs and Support Structure

Check spring integrity: Inspect the feeder springs for signs of fatigue or cracking, as damaged springs can reduce vibration efficiency and cause uneven feeding.

Inspect mounting hardware: Check that all bolts, nuts, and mounts holding the feeder are secure. Loose or damaged mounting hardware can lead to misalignment and excessive wear.

5. Clean the Feeder Pan and Components

Clear material buildup: Regularly clean the feeder pan and trough to prevent material buildup that can obstruct feeding and affect vibration.

Avoid moisture accumulation: Keep the feeder dry, as moisture buildup can lead to material clumping and motor damage over time.

6. Monitor Electrical Components

Inspect wiring and connections: Regularly check all electrical wiring, connections, and the control panel for any loose connections, frayed wires, or signs of overheating.

Examine motor health: Check the drive motor’s temperature during operation to ensure it doesn’t overheat. A motor running hotter than usual could indicate potential issues with bearings or insulation.

7. Conduct Routine Performance Tests

Check feed consistency: Test the feeder’s performance by observing the material flow to ensure it is consistent with no interruptions.

Adjust as needed: Make small adjustments to the amplitude, stroke, or speed based on test results to maintain optimal performance.

8. Perform Preventive and Scheduled Maintenance

Develop a maintenance schedule: Create a regular schedule for checking all critical components based on the feeder’s workload and manufacturer recommendations.

Replace wear parts on time: Parts like springs, liners, and motor components will wear over time, so replace them before they fail to prevent unexpected breakdowns.

Following these maintenance practices helps keep a vibrating feeder operating smoothly and efficiently, ensuring reliable material handling and reducing potential downtime.

The maintenance cycle of a linear vibrating screen depends on several factors such as the type of material being processed, operating conditions, and the screen’s design. However, a general maintenance schedule could be divided into three main categories:

1. Daily Maintenance

• Cleanliness Check: Ensure the screen is free from debris and material buildup to avoid clogging.
• Tighten Loose Fasteners: Check for loose bolts, especially around the vibration motor and screen box.
• Lubrication Check: Inspect lubrication of bearings and rotating parts.

2. Weekly Maintenance

• Lubricate Bearings and Joints: Depending on the manufacturer’s recommendation, lubrication frequency can vary, but weekly checks and additions are common.
• Check Vibration Motors: Inspect the motors for overheating, unusual noise, or vibration anomalies.
• Screen Mesh Inspection: Check the screen surface for tears or excessive wear.

3. Monthly or Quarterly Maintenance

• Full Inspection of Vibration Motor: Inspect electrical connections, motor mounts, and balance weights.
• Structural Inspection: Check for any cracks or deformations in the screen frame.
• Replace Worn Parts: Inspect and replace worn-out screen meshes, gaskets, or dampers.

The schedule could be adjusted based on working conditions and the manufacturer’s guidelines, but following this rough cycle ensures the efficiency and longevity of the equipment.