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Dewatering Sieve Bend Screen for Coal Preparation Plant

JOHNSON SCREEN

Dewatering Sieve Bend Screen for Coal Preparation Plant

WORKING PRINCIPLE AND INSTRUCTIONS FOR USE OF SIEVE BEND VIBRATING SCREEN:

The sieve bend screen is overturned by the feeding box, the screen box, and the screen machine base shaft to realize the position adjustment of the feeding end and the discharging end, so as to achieve uniform wear, prolong the service life, and operate flexibly and conveniently.

It is also widely used in metallurgy, chemical industry, and other industries. DSM screen is a kind of fixed wedge wire screen with a certain radius of curvature and wraps angle. It has no moving parts, and its structure is relatively simple, but its processing capacity is large.
Sieve bend screen plays the role of dehydration, medium removal, desliming, and classification slime recovery in the coal preparation process.

According to the different feeding methods, it can be divided into two kinds: one is the gravity flow wedge wire screen without pressure feeding, the other is the pressure DSM screen with pressure feeding.
The arc screen is mainly composed of a set of the arc screen surfaces, feeders, discharge funnel, and support.

The screen strip used to make the curved screen surface is a trapezoidal screen strip, and the layout direction of the screen strip is perpendicular to the movement direction of the slurry on the screen surface. The screen bar is usually made of stainless steel and sometimes nylon.

When the screened slurry is fed to the screen surface along the tangential direction at a certain speed, under the action of centrifugal force, gravity, and friction, the slurry moves close to the screen surface, and the material layer flows from one screen to another. In the process of rooting the wedge wire, because the edges of the sieve bar have a cutting effect on the material layer, a part of the water and fine particles are separated.
This part of the cut material is discharged through the screen slot under the action of centrifugal force and becomes a sieve.
This part of the material layer that has not been cut flows through the screen surface and becomes the product on the screen.
The thickness of the flow velocity cut by each screen is generally 1/2 to 1/4 of the gap width of the screen. The larger particles in the product under the sieve are about 1/2 of the screen gap. The sieve bend screen can be made into different radii and different angles according to needs. There are five commonly used angles: 45°, 60°, 90°, 180°, and 270°.

The arc angles of 45°, 60°, and 90° are often used in the gravity flow sieve bend screen, which is used in the coal preparation plant and concentrator.

Pressure type sieve bend screen, usually 180 ° and 270 ° radian, is used for grading operation in the grinding process of cement industry.

Because of the great discharge capacity of the arc screen, many coal preparation plants often use the sieve bend screen for pre dewatering before the dewatering screen, and the screen gap is generally 3-6 times larger than that of the dewatering screen in the next process, but it should not exceed 3mm.

The width of the arc screen should be 150-200 mm smaller than that of the dewatering screen in the next process. DSM screen can also be used in series according to needs.

Due to the continuous improvement of the design, the manufacturer has also designed the screen frame according to the needs, which adopts the pivot steering structure and can rotate 180° sieve bend screen, extending the service life of the screen surface.
In addition, experts have also developed a two-way sieve bend screen, which is composed of a vibrating motor, distributor, and screen box. Its feature is that the screen box is composed of two side plates, a branch network steel pipe, two reverse installed screens, and a distribution board.

The screen is fixed on one end of the steel pipe of the branch net through the layering and the wooden wedge, the other end of the steel pipe of the branch net is fixed on the base, and the side plate is connected with the base.
The vibrating motor is installed outside the screen box, and the distributor is installed on the top of the screen box. This two-way DSM screen uses two screens, which not only improves the processing capacity of the arc screen, but also improves the screening efficiency of the sieve bend screen, and makes it very convenient to replace the screen.

HS overturned sieve bend screen is overturned by the feed box, screen box, and screen machine base shaft to realize the position adjustment of the feed end and the discharge end, so as to achieve uniform wear, extend the service life, and operate flexibly and conveniently. It is also widely used in metallurgy, chemical industry, and other industries.

Working principle and instructions of DSM screen:

The DSM vibrating screen is overturned by the feeding box, the screen box, and the screen machine base shaft to realize the position adjustment of the feeding end and the discharging end, so as to achieve uniform wear, prolong the service life, and operate flexibly and conveniently. It is also widely used in metallurgy, chemical industry, and other industries.

Sieve bend vibrating screen is a kind of fixed slot screen with a certain radius of curvature and wraps angle. It has no moving parts, and its structure is relatively simple, but its processing capacity is large. Arc screen plays the role of dehydration, medium removal, desliming, and classification slime recovery in the coal preparation process.

According to the different feeding methods, it can be divided into two kinds: one is the gravity flow DSM screen without pressure feeding, the other is the pressure arc screen with pressure feeding.

The sieve bend screen is mainly composed of a set of the arc screen surface, feeder, discharge funnel, and support. The screen strip used to make the curved screen surface is a trapezoidal screen strip, and the layout direction of the screen strip is perpendicular to the movement direction of the slurry on the screen surface. The wedge wire is usually made of stainless steel and sometimes nylon.

When the screened slurry is fed to the screen surface along the tangent direction at a certain speed, the slurry moves close to the screen surface under the action of centrifugal force, gravity and friction, and the material layer flows from one screen bar to another.
Because the edge of the wedge wire has a cutting effect on the material layer, a part of water and fine particles are separated. Under the action of centrifugal force, this part of the material is discharged through the screen gap and becomes the product under the screen.
The uncut part of the material layer flows on the screen surface and becomes the product on the screen. The flow velocity and thickness of each wedge wire are generally 1 / 2-1 / 4 of the gap width of the wedge wire screen.
The larger particles in the sieved product are about 1 / 2 of the slot size. The wedge wire screen can be made into different radii and angles according to needs. The commonly used angles are 45 °, 60°, 90°, 180°, and 270°.

The arc angles of 45°, 60°, and 90° are often used in the gravity flow sieve bend screen, which is used in the coal preparation plant and concentrator.

Pressure type sieve bend screen, usually 180° and 270° radian, is used for grading operation in the grinding process of cement industry.
Because of the great discharge capacity of the DSM screen, many coal preparation plants often use the sieve bend screen for pre dewatering before the dewatering screen, and the screen gap is generally 3-6 times larger than that of the dewatering screen in the next process, but it should not exceed 3mm.
The width of the DSM screen should be 150-200mm smaller than the width of the dewatering screen in the next process. DSM screens can also be used in series as required.

Due to the continuous improvement of the design, the manufacturer has also designed an arc-shaped screen with a pivot steering structure for the screen frame, which can rotate 180°, which extends the service life of the screen.
In addition, experts have also developed a two-way arc screen, which is composed of a vibrating motor, distributor, and screen box. Its feature is that the screen box is composed of two side plates, a branch network steel pipe, two reverse installed screens, and a distribution board.

The screen is fixed on one end of the steel pipe of the branch net by pressing strips and wooden wedges, the other end of the steel pipe of the branch net is fixed on the base, and the side plate is connected with the base.
The vibrating motor is installed outside the screen box, and the distributor is installed on the top of the screen box. This two-way sieve bend screen uses two screens, which not only improves the processing capacity of the arc screen, but also improves the screening efficiency of the DSM screen, and makes it very convenient to replace the screen.