Screw conveyor

Screw conveyor, commonly known as "dragon".

Screw conveyor is the use of rotating screw materials will be transported along the fixed course inside the casing of the transportation work. Screw conveyor of the axis of rotation direction, determines the transport direction of the material. Screw conveyor has been widely used in various departments of the national economy, such as building material, metallurgy, chemical industry, electric power, coal, machinery, light industry, food and the food industry, is suitable for conveying powder, granulated and small lump materials, such as cement, coal, grain, chemical fertilizer, ash, sand, coke, etc. Should not be transporting perishable materials, big viscosity, easy to agglomerate.

Approximate calculation formula:

Throughput Q = 47 D2 nt Φ pC (t/h)

Type: D conveyor diameter m, n - - pitch screw shaft speed r/min, t m, Φ - material filling coefficient, material density p - t/m3, c - conveyor Angle coefficient

Shaft power P0 = [Q (omega zero l + H) / 367] + DL / 20

Type: Q - throughput, omega zero - resistance material number (1.2 4), L - the length of the m, D - conveyor diameter m, H - tilting arrangement when the vertical height of the m
Follow-up:

Material filling coefficient refers to? The coefficient of slope Angle and conveyor is? How much resistance for several materials is normally, can for example, I'm in fruit juice industry, mainly fruit of raw materials, thank you 12

Answer:

1, the fill factor
The material in the groove of the filling coefficient of material feeding and the energy consumption has a great influence. When the filling coefficient is small, the material stack height is low, most of the material close to the screw of the lateral, and thus has high axial velocity and low rotational speed, the material movement in the transport direction than in circumferential direction is much more significant, the movement of the sliding surface is almost parallel to the conveying direction, then weakened in vertical direction of the conveying additional material flow, energy consumption reduced; On the contrary, when the high fill factor, the material movement of the slip plane is very steep, its movement in circumferential direction will be stronger than conveying direction of movement, this will lead to a drop in conveying speed and the additional energy consumption. Therefore, filling coefficient of appropriate take small value is good, generally take phi is < 50%. In addition, the size of the Angle has some influence on the filling coefficient.

2, oblique Angle
For screw conveyor screw conveyor of the tilt Angle have influence on the productivity and power consumption are conveying process, generally it is a form to reflect the influence coefficient. Screw conveyor transmission capacity will be increased with the increase of Angle rapidly reduced, at the same time, the screw conveyor is decorated Angle will also affect the material conveying effect. Another Angle can also affect the size of the filling coefficient. The filling coefficient of tilt Angle is larger, allowing the smaller, screw conveyor, the lower the transmission capacity. Therefore, on the premise of meet the conditions of use, screw conveyor, try to avoid tilting arrangement, and the best using horizontal layout; If the process need to be adopted by tilting arrangement, in order to improve the efficiency of transmission, tilt Angle also shoulds not be too big, general Angle beta = 10 ° ~ 20 °.

3, transmission power loss:
The drive power of the screw conveyor, is used to overcome all kinds of resistance in the process of conveying the energy consumption, mainly includes the following several parts: (1) to be transported materials hoisting height H (horizontal or inclined) the amount of energy needed; (2) be shipped material of tank wall and the spiral surface caused by the friction energy consumption; (3) among the particles of the material of energy consumption caused by rubbing against each other; (4) material from moving along the trough in the thrust bearing of the friction energy consumption; (5) intermediate bearing and the bearing at the end of energy consumption caused by friction.
For brevity, screw conveyor general shaft power P including material running need P1 P2 no-load running the required power, power and additional power caused by tilting a few three parts.