Calculation of conveyor conveying capacity:
1. Determine the basic parameters
a) Production capacity (m3/h): 40
b) conveyor tank length: 12m
c) main vibration spring angle (°): 15
d) Motor power: 5.5kw
e) Vibration frequency (1/mim): 400-600
Select process parameters:
a) height of tank (mm): H=250
b) tank width (mm): B=800
c) main vibration angle (°): 15
d) The amplitude A depends on the eccentricity of the eccentric shaft 6mm
e) The average material velocity Vs depends on the reference range Vs=0.15m/s-0.50m/s.
f) material layer thickness h value of small block material h = 120mm
g) Material specific gravity r = 1.3t/m3. (Foundry sand)
Transport material layer thickness is generally recommended:
Fine-grained materials should be ≤ 40mm, small pieces of material ≤ 100mm, large pieces of material ≤ 200mm.
Taking into account the non-uniformity of the fluctuation of the material conveying process, take the material layer thickness h=120mm.
3 Mechanism characteristics Description The drive system of the connecting rod vibrating conveyor is driven by the motor through a belt pulley and a V-belt drive to drive the eccentric shaft to rotate. The elastic link and the main vibrating spring are used to excite the tank body to linearly reciprocate along a certain direction.
The vibration amplitude is a fixed value, (eccentricity of the eccentric shaft), the supporting spring and the supporting swing rod respectively connect the vibration tank body and the balance frame hingedly, so that the stability of the vibration state is good, and the required excitation excitation force is required. The power is relatively low, the excitation force transmission is stable during the vibration process, and long-distance transmission can be realized.
4. Average material velocity Vs calculation
a) Select 6-level motor; n=960r/mim
b) The diameter of the active pulley section d1=170mm
c) Driven pulley pitch diameter d2=315mm
d) eccentric shaft speed: calculated:
N1=n*d1/d2=960*170/315=518r/mim
Meet the vibration frequency (1/mim): 400-600 requirements, change the driven pulley diameter can change the frequency of vibration.
Eccentric shaft speed: V=3.14*n1*R/30 m/s
Type: eccentric shaft speed n1=518r/mim
R-eccentric shaft eccentricity 0.006mm
Calculated: v=0.325m/s
f) When the main vibration spring angle is 15°:
Its horizontal speed:
V1=v*cos15°=0.325*0.966=0.314m/s
Its vertical speed:
V2=v*sin15°=0.325*0.258=0.084 m/s, which can be considered as initial throwing speed.
Therefore, different angles between the main oscillation angles will produce different horizontal and vertical sub-velocity, which will affect the material's conveying capacity.
g) Average material speed
Vs=v1*c1*c2*c3=0.314*0.8*0.8*0.9=0.18m/s
In the formula:
C1-material nature influence factor, block material take 0.8-0.9, granular material take 0.9-1.0, powder material take 0.6-0.7.
C2-material layer thickness coefficient, thickness layer 0.7-0.8, thin layer 0.9-1.0.
c3-Slip speed influence coefficient, take 0.85-1.0 when density is high and 0.75-0.9 when density is low.
5. The material conveying capacity Q is calculated according to the formula: Q=V3*A*&*q
Calculated: Q = 0181 * 0.8 * 0.12 * 1.3 * 0.7 = 0.158m3 / h (to meet the basic parameters required to determine)
In the formula:
Vs-average speed of material m/s
A-slot cross-sectional area (slot width B* height h)
&-The proportion of materials r = 1.3
Q-material fill factor 0.7.
The material conveying capacity usually adopts the above method for preliminary calculation to confirm the scheme design and structural process of the connecting rod vibratory conveyor, and the design calculation of the conveying capacity of the inertial vibrating conveyor is similar.
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