1 main technical parameters horizontal screw centrifuge main technical parameters: model wl-450, drum inner diameter 450mm, drum effective length 1030mm, drum speed 2500r / min, spiral difference speed 50r / min, spiral pusher single head right hand Hysteresis, main motor y200l2-2 (n=11kw), separation factor 1573, auxiliary motor y160m-4 (n=11kw), oil pump model y1b-12, oil pump motor y90l-6 (n=1.1kw), host material 1cr18ni9ti.
2 Working principle The horizontal screw centrifuge consists of a high-speed drum, a spiral and a differential that rotates the same as the drum and has a lower rotational speed than the drum. It belongs to the cone-column structure.
The drum is a cylindrical-conical composite cylinder, and the two ends are supported by bearings on the base. The motor is driven by a pulley to make it rotate at a high speed. The spiral is a rotating drum with a spiral type blade. Both ends are supported by the bearing in the rotating drum, and the rotating drum is transmitted to the spiral through the differential. Due to the differential action of the differential, the spiral speed is 1% slower than the rotating drum speed. ～3%, in this way, a spiral conveying mechanism is formed due to the relative movement of the drum and the spiral. The suspension to be separated is fed into the spiral drum through the feeding tube, and is thrown into the rotating drum through the feeding hole by the acceleration of the cloth tray. At this point, the suspension is placed in a strong centrifugal force field, due to the solid phase The mass is large, and the centrifugal force is also large, so that it settles on the inner wall of the drum, and is conveyed by the screw to the small end discharge port, where centrifugal force throws it into the sediment chamber of the casing. The clarified liquid phase flows out through the spiral passage to the large end. The overflow hole overflows into the casing and is discharged through the pipeline. Thus, the solid-liquid two phases of the suspension are separated. During the propulsion process of the spiral, the solid phase enters the drying zone (non-liquid submerged zone) from the settling zone (liquid submerged zone). At this point, a part of the liquid in the solid phase material is squeezed out and flows back to the settling zone. This is the so-called drying process. As can be seen from the above, the separation operation of the machine is performed continuously and automatically. At the same time, the settlement area of ​​the machine can be adjusted. This adjustment is achieved by changing the overflow radius by replacing the overflow disk. Increasing the length of the settlement zone can result in a clear liquid phase and a material with a higher moisture content. , will get a lower moisture content of the material and a higher solids liquid phase.
In the centrifuge, in order to measure the magnitude of the centrifugal force, it is usually expressed by the separation factor fr, which is the ratio of the centrifugal acceleration to the gravitational acceleration, fr = rω2 / g. It can be seen that for a certain material, the larger the rotating drum speed, the larger the separation factor and the better the separation effect. For difficult-to-separate suspensions with small solid particles, large dispersion, and high liquid phase viscosity, a centrifuge with a high separation factor can be used.
From the nature of the aforementioned strontium carbonate slurry, the horizontal screw centrifuge just meets the separation requirements of the slurry. According to the nature of the material, the material of all the contact materials of the horizontal snail body is uniformly made of stainless steel; in order to improve the spiral wear resistance, a layer of wear-resistant alloy is sprayed on the surface of the spiral blade. Due to the large production volume, the solid phase discharge scraper is seriously worn. It is possible to change 2 scrapers to 4 and change the screw connection to weld. The differential is the core component of the horizontal snail. It has high precision, high cost, difficult processing and difficult maintenance. The high-speed planetary gear bearing is fixed on the wheel to reduce the linear speed. The lubrication is poor, and the bearing can be fixed on the shaft. The rotating radius is increased, the line speed is increased, the oil volume is increased, the lubrication effect is improved, the friction is reduced, and the life is extended.
2 Working principle The horizontal screw centrifuge consists of a high-speed drum, a spiral and a differential that rotates the same as the drum and has a lower rotational speed than the drum. It belongs to the cone-column structure.
The drum is a cylindrical-conical composite cylinder, and the two ends are supported by bearings on the base. The motor is driven by a pulley to make it rotate at a high speed. The spiral is a rotating drum with a spiral type blade. Both ends are supported by the bearing in the rotating drum, and the rotating drum is transmitted to the spiral through the differential. Due to the differential action of the differential, the spiral speed is 1% slower than the rotating drum speed. ～3%, in this way, a spiral conveying mechanism is formed due to the relative movement of the drum and the spiral. The suspension to be separated is fed into the spiral drum through the feeding tube, and is thrown into the rotating drum through the feeding hole by the acceleration of the cloth tray. At this point, the suspension is placed in a strong centrifugal force field, due to the solid phase The mass is large, and the centrifugal force is also large, so that it settles on the inner wall of the drum, and is conveyed by the screw to the small end discharge port, where centrifugal force throws it into the sediment chamber of the casing. The clarified liquid phase flows out through the spiral passage to the large end. The overflow hole overflows into the casing and is discharged through the pipeline. Thus, the solid-liquid two phases of the suspension are separated. During the propulsion process of the spiral, the solid phase enters the drying zone (non-liquid submerged zone) from the settling zone (liquid submerged zone). At this point, a part of the liquid in the solid phase material is squeezed out and flows back to the settling zone. This is the so-called drying process. As can be seen from the above, the separation operation of the machine is performed continuously and automatically. At the same time, the settlement area of ​​the machine can be adjusted. This adjustment is achieved by changing the overflow radius by replacing the overflow disk. Increasing the length of the settlement zone can result in a clear liquid phase and a material with a higher moisture content. , will get a lower moisture content of the material and a higher solids liquid phase.
In the centrifuge, in order to measure the magnitude of the centrifugal force, it is usually expressed by the separation factor fr, which is the ratio of the centrifugal acceleration to the gravitational acceleration, fr = rω2 / g. It can be seen that for a certain material, the larger the rotating drum speed, the larger the separation factor and the better the separation effect. For difficult-to-separate suspensions with small solid particles, large dispersion, and high liquid phase viscosity, a centrifuge with a high separation factor can be used.
From the nature of the aforementioned strontium carbonate slurry, the horizontal screw centrifuge just meets the separation requirements of the slurry. According to the nature of the material, the material of all the contact materials of the horizontal snail body is uniformly made of stainless steel; in order to improve the spiral wear resistance, a layer of wear-resistant alloy is sprayed on the surface of the spiral blade. Due to the large production volume, the solid phase discharge scraper is seriously worn. It is possible to change 2 scrapers to 4 and change the screw connection to weld. The differential is the core component of the horizontal snail. It has high precision, high cost, difficult processing and difficult maintenance. The high-speed planetary gear bearing is fixed on the wheel to reduce the linear speed. The lubrication is poor, and the bearing can be fixed on the shaft. The rotating radius is increased, the line speed is increased, the oil volume is increased, the lubrication effect is improved, the friction is reduced, and the life is extended.
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