Paper Machine Vibrating Screen

 

In the paper industry, "Vibrating Screen" is a crucial equipment for pulp screening and purification, playing a vital role in enhancing pulp quality, optimizing the production process, and ensuring the final quality of the paper. Its main function is to conduct fine screening on the incoming pulp through continuous vibration. This process effectively removes various impurities mixed in the pulp, such as fine sand grains, undissociated fiber bundles, aggregated fiber masses, plastic fragments, etc., and separates coarse fibers that do not meet the papermaking requirements. Such screening operations can significantly improve the purity and quality uniformity of the pulp, providing high-quality and highly pure pulp raw materials for subsequent papermaking processes such as sheet forming, pressing, drying, and coating. This effectively guarantees that the produced paper achieves the desired standards in terms of physical properties (such as strength, air permeability, flatness, etc.), appearance quality (such as smoothness, color uniformity, etc.), and printability.

 

 

Used for removal of various impurities in puip suspension.

 

 

• Shock-relieving assembly is made from special rubber,therefore, screen basket is stable during operation, with low noise.
• For different areas, hole diameter arrangement of screen plate is different, which is beneficial to removing impurities and reducing fiber loss.
• Air-seal chamber with special design can make self-washing ability of screen plate strong.

 

 

1.Vibration Drive

Driven by a high-performance motor or other reliable power device, the power is transmitted to the screen frame through a transmission mechanism, causing it to generate high-frequency and regular vibrations.

The vibration frequency and amplitude can be precisely adjusted and set according to actual production needs and the characteristics of the pulp. Generally, a higher vibration frequency helps improve the screening efficiency, and an appropriate vibration amplitude is beneficial for promoting the uniform distribution and smooth flow of the pulp within the screen frame.

 

2.Screening Process

When the pulp is introduced into the interior of the screen frame of the vibrating screen, under the powerful vibration effect, each component in the pulp is subjected to different degrees of force. Fine fibers and good pulp that meet the requirements can smoothly pass through the tiny pores of the screen mesh due to their smaller size and good morphology. While larger-sized impurities, undispersed fiber bundles, and coarse fibers that do not meet the papermaking requirements are effectively retained on the surface of the screen mesh as they cannot pass through the pores of the screen mesh.

During the screening process, the vibration not only promotes the separation of each component in the pulp but also avoids the clogging and accumulation of fibers on the screen mesh, ensuring the continuous and efficient progress of the screening process.

 

3.Impurity Discharge

With the continuous vibration, the impurities retained on the screen mesh gradually gather towards a specific area of the screen frame (such as near the reject outlet) under the combined action of vibration and gravity. When accumulated to a certain extent, these impurities are orderly discharged from the screen frame through the specially designed reject outlet, thereby achieving the effective separation and removal of impurities from the good pulp.

 

 

1.Screen Frame

Usually made of sturdy and durable metal materials, such as stainless steel or high-strength alloys, to withstand high-frequency vibrations and wear and fatigue from long-term use. The shape and size of the screen frame are carefully designed to adapt to different production scales and process requirements.

Its internal surface undergoes special treatment to reduce the adhesion and resistance of the pulp, improving the screening efficiency and cleanliness.

 

2.Screen Mesh

Composed of filter meshes with specific pore sizes and materials, such as stainless steel wire woven mesh or synthetic fiber filter mesh. The pore size of the screen mesh is precisely selected according to the required screened pulp components and impurity sizes to ensure the effective separation of good pulp and impurities.

The screen mesh is firmly installed on the screen frame to ensure no loosening or deformation occurs during the vibration process and is convenient for replacement and maintenance.

 

3.Vibration Mechanism

Includes components such as the motor, eccentric wheel, transmission shaft, bearings, etc. The motor provides power, converts the rotary motion into linear vibration through the eccentric wheel and transmission shaft, and supports and transmits the vibration force through the bearings to ensure the stability and reliability of the vibration.

The design and parameter adjustment of the vibration mechanism directly affect the vibration characteristics and screening effect of the vibrating screen.

 

4.Inlet and Outlet

The inlet is reasonably designed to ensure the pulp can evenly enter the interior of the screen frame, avoiding local accumulation and uneven distribution.

The outlet is divided into the good pulp outlet and the impurity outlet. The good pulp outlet is usually connected to subsequent processing equipment or pipelines to convey the screened high-quality pulp to the next process. The impurity outlet is used to discharge the separated impurities for centralized treatment or recycling.

 

5.Support and Damping Device

Composed of sturdy supports and damping springs or rubber pads, etc., it is used to support the weight of the entire vibrating screen and reduce the transmission and impact of vibration on surrounding equipment and the infrastructure.

The performance of the support and damping device is directly related to the stability of the equipment, operating noise, and the impact on the working environment.

 

6.Control System

Composed of electrical control boxes, sensors, frequency converters, etc., it is used to control the rotational speed of the motor, the vibration frequency and amplitude, and monitor the operating status and fault alarms of the equipment.

The advanced control system can achieve automatic operation and remote monitoring, improving the operating efficiency and management level of the equipment.

 

 

1.Efficient Screening

With high-frequency vibration and a reasonable screen mesh design, it can handle a large amount of pulp in a short time, achieving efficient impurity separation and pulp purification.

It can maintain stable and excellent screening effects for different types and qualities of pulp.

 

2.Precise Separation

The pore size of the screen mesh can be precisely adjusted according to production requirements, thereby achieving precise separation of impurities and fibers of different sizes and ensuring a high degree of consistency in pulp quality.

Effectively reduces the loss of good pulp, improving the recovery rate and utilization rate of the pulp.

 

3.Sturdy Structure

Adopts high-strength materials and a stable structural design, capable of withstanding long-term high-frequency vibration and heavy-duty working conditions, with a long service life and a low failure rate.

The components are tightly connected, with stable and reliable operation, ensuring the equipment can operate normally under harsh working environments.

 

4.Simple Operation and Maintenance

The operation interface of the equipment is simple and intuitive, and operators can master the operation essentials proficiently after simple training.

Daily maintenance work is relatively simple, mainly including cleaning and replacement of the screen mesh, lubrication and inspection of the vibration components, etc., which is easy to implement and has a low maintenance cost.

 

5.Strong Adaptability

Can adapt to pulps of different concentrations, temperatures, and flow rates, as well as different scales and types of papermaking production lines, with a wide application range and good versatility.

 

 

1.Operation Key Points

Before starting the machine, the operator should carefully check whether each component of the equipment is firmly installed, whether the electrical connection is normal, whether the screen mesh is intact, and whether the feed and discharge pipelines are unobstructed.

Set the parameters such as vibration frequency, amplitude, and feed speed correctly according to the characteristics of the pulp and production requirements. During the operation of the equipment, closely observe the screening effect of the pulp and the operating status of the equipment. If any abnormalities are found, stop the machine for inspection in a timely manner.

Regularly conduct quality tests on the screened pulp and adjust the equipment parameters according to the test results to ensure the best screening effect is always achieved.

 

2.Maintenance Work

Regularly clean the residual pulp and impurities on the screen frame and screen mesh to prevent clogging and affecting the screening effect. Check the wear and damage of the screen mesh and replace the damaged screen mesh in a timely manner.

Regularly lubricate and inspect the vibration mechanism to ensure the normal operation of components such as the motor, eccentric wheel, transmission shaft, and bearings. Replace worn parts in a timely manner to ensure the stability and reliability of the vibration.

Check the working status of the support and damping device. If there is spring failure or rubber pad aging, replace it in a timely manner. Regularly tighten the connection bolts of the equipment to prevent loosening due to vibration.

Regularly inspect and maintain the control system to ensure the normal operation of electrical components, the accuracy and sensitivity of sensors, and the stable operation of the frequency converter. Update the software and parameters of the control system in a timely manner to adapt to changes in the production process.

 

 

1.Improve Paper Quality

By removing impurities and undesirable fibers from the pulp, significantly improve the physical properties, appearance quality, and printability of the paper, and produce high-quality paper products.

Reduce flaws and defects in the paper, improving the product qualification rate and market competitiveness.

 

2.Optimize the Production Process

Provide pure and uniform pulp raw materials for subsequent papermaking processes, making the entire production process more stable and efficient, and reducing production interruptions and adjustments caused by pulp quality issues.

Help reduce the wear and failure of subsequent equipment, extend the service life of the equipment, and reduce maintenance costs.

 

3.Save Resources and Costs

Improve the recovery rate and utilization rate of the pulp, reduce the waste of raw materials, and lower the production cost.

Reduce energy consumption and wastewater discharge, comply with environmental protection requirements, and achieve sustainable development.

 

 

Type			ZSK5	ZSK4	ZSK6	ZSK7
Screen area：㎡			1	2	3	4
Consistency of inflow pulp		Hole screen：%	1.2～1.5
		Slot screen：%	0.5～0.8
Capacity ：t/d	Treating tail	Slot screen：t/d	4.5～15	9～30	13.5～45	18～60
		Hole screen：t/d	2～4.5	4～9	6～13.5	8～18
	Main flow	Slot screen：t/d	7.5～25	15～50	22.5～75	30～100
		Hole screen：t/d	3.5～7.5	7～15	10.5～22.5	14～30
Power of motor：kw			2.2	3	4	5.5
(L×W×H)：mm			2660×1950×1370	2760×2560×1440	2790×3220×1440	3445×3500×1440

 

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