DD Series Double Disc REfiner

DD series refiner is available for continuous beating of chemical wood pulpmechanical pulp and waste paper pulp, The equipment is furnished with automaticcontrol system and can beat with constant power or constant energy consumption The beating effect if stable.

1.Grinding Discs

Carefully fabricated from high-strength wear-resistant materials, such as special alloy steels or ceramic composites. These materials undergo special heat treatment and surface strengthening processes, possessing extremely high hardness and wear resistance, capable of maintaining a good working state during long-term operation.

The surfaces of the grinding discs are designed with unique tooth shapes and grooves. The shape, size, and distribution of the tooth shapes are precisely calculated and optimized to achieve efficient cutting, fibrillation, and fine fibrillation of the pulp. The grooves facilitate the flow and dispersion of the pulp, improving the uniformity of the beating.

The grinding discs are usually divided into a moving disc and a stationary disc. The gap between the two can be adjusted according to the beating requirements to control the degree and effect of the beating.

2.Main Shaft

Made of high-quality alloy steel, featuring excellent mechanical strength and fatigue resistance. The diameter and length of the main shaft are designed based on the specifications and power of the refiner to ensure it can withstand huge torque and loads.

The main shaft is installed on the frame through high-precision bearings. The bearings adopt high-quality rolling bearings or sliding bearings, capable of providing good support and lubrication, reducing friction and wear, and ensuring the smooth operation of the main shaft.

The main shaft is tightly combined with the moving disc through key connections or spline connections, ensuring that the power can be effectively transmitted to the grinding disc for high-speed rotation.

3.Motor

Adopts a high-power AC motor or DC motor, featuring high efficiency and energy saving, a wide speed regulation range, and stable operation. The power of the motor is selected based on the processing capacity and beating requirements of the refiner to meet the needs of different production scales.

The motor is connected to the main shaft through couplings, belt drives, or gear drives, etc. The transmission system is carefully designed and debugged to ensure the smooth and accurate transmission of power and reduce energy loss.

To achieve speed regulation and control of the motor, a frequency converter or speed controller is usually equipped, which can adjust the motor speed in real-time according to changes in the production process, thereby altering the beating effect of the refiner.

4.Feed Device

Comprises a feed hopper, a feed screw, or a feed pump, etc., capable of uniformly and stably transporting the pulp to be beaten to the beating area. The shape and capacity of the feed hopper are designed to facilitate the addition and storage of the pulp.

The rotational speed and conveying volume of the feed screw or feed pump can be adjusted to adapt to pulps of different concentrations and flows. The feed device may also be equipped with a stirrer or homogenizer for further mixing and dispersion of the pulp to ensure that the pulp entering the beating area has uniform properties.

To prevent blockage or backflow of the pulp during the feeding process, the feed device is usually equipped with pressure sensors and flow sensors, capable of monitoring the feeding situation in real-time and automatically adjusting the feeding parameters through the control system.

5.Discharge Device

Includes a discharge port, a discharge pipe, and a discharge screen, etc. The position and shape of the discharge port are reasonably designed to facilitate the smooth discharge of the beaten pulp.

The discharge pipe is usually made of wear-resistant and corrosion-resistant materials to prevent wear and corrosion of the pipe by the pulp. The discharge screen is used to filter out coarse fibers and impurities generated during the beating process to ensure the quality of the discharged pulp.

The discharge device may also be equipped with a discharge valve or discharge pump to control the speed and flow of the discharge to match the subsequent production processes.

6.Frame

Welded from a sturdy steel structure, with sufficient strength and stiffness to support the weight of the entire refiner and the vibration and impact generated during operation.

The surface of the frame undergoes rust prevention treatment and painting to improve its corrosion resistance and appearance quality. For ease of installation and maintenance, the frame is usually designed with detachable side plates and access doors.

7.Automatic Control Operating System

Composed of sensors, controllers, touch screens, or computer terminals, etc. Sensors can monitor the operating parameters of the refiner in real-time, such as motor power, current, rotational speed, pulp temperature, pressure, etc.

The controller automatically controls and regulates the operation of the refiner based on the preset program and the data feedback from the sensors. For example, it can switch between constant power and constant energy consumption beating modes, adjust parameters such as the grinding disc gap, feed speed, and motor speed to ensure the stability and consistency of the beating effect.

The touch screen or computer terminal provides an intuitive and convenient human-machine interface, through which the operator can set process parameters, view the operating status, diagnose faults, etc.

8.Lubrication and Cooling System

Comprises an oil pump, an oil tank, a cooler, filters, and oil pipes, etc. The lubrication system can provide sufficient lubricating oil for the moving parts of the refiner, such as bearings and gears, reducing friction and wear and prolonging the service life of the equipment.

The cooling system is used to reduce the heat generated during the beating process and ensure the equipment operates within the normal temperature range. The cooling medium is usually water or oil, which exchanges heat with the heating parts through the cooler to remove the heat.

1.Feeding：The chemical wood pulp, mechanical pulp, or waste paper pulp to be beaten uniformly enters the beating area of the double disc refiner through the feed device.

2.Beating：The motor drives the main shaft to rotate the moving disc at high speed, creating a relative motion between the moving disc and the stationary disc. The pulp is subjected to intense shearing, extrusion, and rubbing forces between the grinding discs, and the fibers are cut, beaten, and fine fibrillated.

3.Adjustment：According to the settings of the automatic control operating system, by adjusting parameters such as the grinding disc gap, motor speed, and feed speed, the beating mode of constant power or constant energy consumption is achieved to reach the expected beating effect.

4.Discharge：The pulp after the beating process is discharged from the refiner through the discharge device and enters the subsequent process flow.

1.Efficient Beating：The unique design of the grinding discs and the high-speed rotation working mode can fully beat the pulp in a short time, improving production efficiency.

2.Stable Beating Quality：Equipped with an automatic control operating system that can precisely control various parameters during the beating process, ensuring the consistency of the beating effect each time and thereby improving the stability of product quality.

3.Strong Adaptability：Suitable for various types of pulps, such as chemical wood pulp, mechanical pulp, and waste paper pulp, capable of meeting the requirements of different papermaking processes.

4.Energy Saving and Consumption Reduction：The beating mode of constant power or constant energy consumption can effectively reduce energy consumption, improve energy utilization efficiency, and lower production costs.

5.Convenient Operation：The degree of automation is high, and the operation is simple. Parameter settings and equipment monitoring can be achieved through the touch screen or computer terminal.

6.Low Maintenance Cost：Utilizing high-quality materials and advanced manufacturing processes, the equipment has high reliability and a long service life, reducing the frequency and cost of maintenance and component replacement.

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