Vibrating screens play a crucial role in solving various mechanical problems in factory machinery. They offer numerous significant advantages, making them a leader in material handling systems for many important industrial applications. The basic design principle of a vibrating screen is to transmit vibration to the screen surface, thereby achieving material separation. The chassis of the screen is its main component, providing support for the various parts that make up the screen surface.
The screen mesh can distinguish dust from other particles by analyzing the size, shape, and density of the particles. First, bulk raw materials are conveyed forward from the inlet. The vibrating feeder loads the material from the center, causing it to rotate radially through the outer edge. As one of the most well-known pieces of equipment in the waste management, recycling, and aggregate industries, it offers many benefits.
Learning more about how the machine works, vibration can break particles, separating them into finer fragments. Because fine particles can easily pass through the perforated surface of the screen mesh, the separation process is more efficient. Larger particles are carried forward to the front of the screen. Vibrating feeders utilize this characteristic and are widely used in various industrial sectors, especially in the mineral processing and recycling industries.
Working Principle of Vibrating Screens
All screens have holes of different sizes to achieve their primary function: separating materials by particle size. Crushing equipment uses vibrating screens to sort stones into various sizes according to the specifications of the final product.
Stones must be small enough to pass through the holes of the vibrating feeder and fall into the space below the screen. Stones that are too small can pass through the screen. Modern vibrating screens typically have multiple layers of screens. Each layer has its own set of screens, which are supported by a platform. Materials that are too large to pass through the material conveying system at the end of a layer will fall to the next layer; otherwise, they will be discharged from the system at the end of the layer where the screen is located. Finally, the product outlet distributes the material from each layer separately. Therefore, stones are sorted according to their size.
Types of Vibrating Screens
There are various types of vibrating screens on the market, each with its unique design, working principle, and screen material. Based on the screen angle, vibrating screens can be divided into two main categories:
Inclined Screen:
The screen inclination angle is typically adjustable between 15 and 30 degrees. Due to the shorter stroke and greater weight of inclined screens, their eccentric load will differ.
Horizontal Screen:
Horizontal screens move in an elliptical trajectory and are perpendicular to the ground. Larger screen openings result in higher screening system efficiency and better collection of appropriately sized particles.
Applications of Vibrating Screens
Vibrating screens are widely used in various industries, including:
Food Industry
Petroleum Industry
Agricultural Product Manufacturing
Pharmaceuticals
Chemicals
Mineral Processing
Mining
Rubber Industry
Paper Industry
Sugar Industry
Features of Vibrating Screens
Vibrating screens are significantly more efficient than traditional screening methods:
Non-vibrating screens typically use fixed screens with a large inclination angle. During vibrating screen operation, the material shakes, and particles jump on the screen surface instead of sliding. Each jump is an effort to squeeze through the screen openings; if the machine vibrates, the probability of particles passing through the openings increases. In other words, the efficiency of vibrating screens is significantly improved.
If a particle repeatedly jumps and falls, it may land in the openings or in areas without openings. If a particle lands on a wire mesh or other material instead of passing through the wire mesh openings, it cannot pass through the openings. This is because all the tiny particles that might leak through the holes need to make an infinite number of jumps, making it impossible for any screen to achieve 100% filtration efficiency.
The effectiveness of a processing system can be calculated by dividing the mass of particles passing through the screen by the mass of particles that should pass through the screen.
Vibrating Screen Capacity:
Sorting large volumes of goods requires a larger screening area. The most obvious sign of an undersized screen is reduced screening efficiency. However, as the number of items that can pass through the screen decreases, the required screening area increases as the size of the items to be sorted decreases.
Vibrating Screen Frequency:
For broad sorting, low-frequency, large-amplitude vibrations are better; for narrow sorting, high-frequency, small-amplitude vibrations are better. Therefore, larger particles should be moved slowly and broadly with fewer but larger jumps; smaller particles should be moved quickly and narrowly with more but smaller jumps. Particles should avoid passing through too many single-jump holes.
Importance of Proper Feeding:
As with other sorting equipment, vibrating feeders need to fully utilize all available working areas, starting from the far left. When material falls onto the screen surface and accumulates, the particles at the top of the accumulation only come into contact with the screen or screening elements after vibration causes the accumulation to disperse. At this point, the accumulation has already fallen to half the height of the screen surface. This means that wear in the accumulation area is accelerated, resulting not only in high maintenance costs but also wasting valuable working space. Furthermore, if the accumulation is too high, blockages are likely to occur, which is particularly detrimental to low-density materials. Therefore, the pipes used to pour material onto the screen must be carefully designed and installed, and auxiliary devices such as vibrating distributors can be used when necessary.
Advantages of Vibrating Screens
Lower Operating Costs: Vibrating screens are known for their robust structure, simple operation, and streamlined machine design. Their price is significantly lower than other types of screening equipment. The energy consumption of vibrating feeders is also much lower than other complex screening equipment. This saves companies a significant amount of machine operating costs. Due to the extremely high vibration frequency, the only consumable that wears frequently is the screen. Therefore, this reduces the cost of maintaining peripheral equipment.
Lower Maintenance Costs: Due to frequent system failures and severe wear, the maintenance costs of material handling systems are often higher than other types. However, the design of a vibrating screen concentrates vibration only on the screening surface, thus isolating the vibration source and preventing it from spreading to other areas of the machine. Therefore, the overall cost of the material handling system is reduced due to the lower frequency of movement of the machine's components.
Enhanced Material Handling: Vibrating screens are well-suited to meet the needs of the mining industry, offering numerous benefits to the entire sector. Their high output force is designed to improve product recovery rates by separating coarse and fine particles. Both of these aspects ultimately result in higher-quality raw materials and greater production efficiency.
Improved Screening Efficiency: Vibrating feeders are among the most durable screening equipment on the market for controlling the processing speed of heavier materials. Therefore, a constant feed flow rate is crucial for the optimal performance of a vibrating screen. Similarly, this screen can also be used to maintain material backflow, but the feed rate needs to be reduced.