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plastic dryer

Plastic dryer parameters

source：Plastic pellet dryer
Author：plastic dryer
time：2020年10月14日 09:48:11

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Design input: φ2.6X26 Plastic dryer
1. Diameter of cylinder
Set as φ2.6 meters, by the formula D=√4L(1+X)/3.14V
Among them: L = air consumption, kg/s X = air humidity when leaving the dryer, kg/kg
V=air velocity, kg/(m2.S) general cylinder section gas velocity V=0.55~5.5 kg/(m2.S), section linear velocity is 2~5m/s; the smaller the dry particle size, the smaller one,
Otherwise, take the larger value. The air velocity of the dryer can be 2~3m/s. For materials with a particle size of about 1mm, the gas velocity is 0.3~1.0m/s;
For materials with a particle size of about 1~5mm, the gas velocity is 1.2~2.2m/s;
Particle size and bulk density (kg/m3)
Mm 350 1000 1400 1800 2200
0.3~2 0.5~1 2~5 3~7.5 4~8 5~10
》2 1~3 3~5 4~8 6~10 7~12
2. Length of cylinder
Set to 26 meters, by the formula V=1.2W/A
Where: V = the volume of the dryer, m3
W=The amount of evaporated water in the dryer, kg/h
A=dry strength, kg/(m3.h)
, By the formula V=Q/a.Δt
Plastic dryer parameters Aparametersmong them: a=volume heat transfer coefficient, KJ/m3.h.℃, generally 418.6~837.2
W=The amount of evaporated water in the dryer, kg/h
A=dry strength, kg/(m3.h)
3. Length to diameter ratio
The aspect ratio of the general dryer (Z/D)=4~12, the smaller diameter is the larger value, and the larger diameter is the smaller value. 26/2.6=10, which is appropriate. The aspect ratio of the general dryer (Z/D) =3.5~7, 4. Residence time τ
τ=(60zsinψ1)/(3.14Dnsinβ) s where z=length of cylinder m takes 26m
D=Cylinder diameter m is taken as 2.6m ψ1=The natural inclination angle of the material is taken as 30 degrees
β = the horizontal inclination angle of the cylinder, take 2.5 degrees
n = cylinder speed r/min, take 3.45 r/min
Suitable filling factor is 8%~13%, generally not more than 25%. Here is 10%. Suitable filling factor is 20%~25%, 6. Slope and speed
1. Slope
Generally 0~8 degrees, generally 1.5~3 degrees, not more than 6 degrees. Here is 2.5 degrees. 2. Speed
The speed range is 1~8 r/min, and the commonly used one is 1~3 r/min and the cylinder peripheral speed exceeds 1m/s. It is appropriate to take 3.45 r/min here, and its peripheral speed is about 0.47m/s, that is Suitable. The linear speed of rotation is about 0.2~0.3m/s. 7. Span and thickness of cylinder
The length-to-diameter ratio of the dryer is generally less than 12, and it adopts two-gear support. Generally 0.56~0.6Z. Here Z=26, that is, the span is
14.5~15.6, 15 meters is appropriate. The relationship between the thickness and diameter of the cylinder is shown in the table below
Cylinder diameter D m ≤1 1.2~1.4 1.4~2 2~2.6 2.6~3 3~3.6 3.6~4
Thickness of cylinder δ
mm
8 10 12 14 16 18 20
Lower cylinder of rolling ring
Wall thickness mm
16 20 24 28 32 36 40
The wall thickness of the lower cylinder of the rolling ring is generally 2δ, and the width of the thickened part is 1800mm. 8. The position of the retaining wheel and the ring gear on the cylinder
The distance between the gear wheel and the ring gear is approximately equal to the diameter of the cylinder. Take 3 meters here. IX. Copy board
Take a spiral copy board about 2 meters long at the end of the feed port;
The form of copy board is lift;

The number of copy boards is related to the diameter of the cylinder. The relationship between the number of blocks and the diameter of the cylinder is generally: n=(10~14)D;
That is, n=26~36, take 32 here
Plastic dryer parameters The relationship between the height h in the radius direction of the copy board and the cylinder diameter D is shown in the following table: Cylinder diameter D m 1~1.2 1.6 2 2.2 2.5 2.8
h/D 0.2 0.156 0.125 0.12 0.112 0.1
Here, the ratio is 0.112 according to the table, then the height of the copy board is 0.112X2.6=300mm 10.
Cylinder weight: Q=0.242(D+δ) δ, N/m (D, δ is mm)
Calculate here Q=30T
The self-weight of the copy board Qs=(1.15~1.25)Q, calculate here Qs=36T
11. Backing plate of rolling ring
The center distance between the backing plates is 400~460mm, the width of the backing plate accounts for 50% of the entire circumference, and the thickness of the backing plate S=30~50mm, you can also refer to the following table: Cylinder diameter, m 1.8~2.2 2.2~2.6 2.6 ~3.2 3.2~4 4.2~4.8
Number of plates, block 16 20 24 28 32
Pad width, mm 200~230 200~230 200~240 210~260 240~280
Backing plate thickness, mm 30 35 40 45 50
Refer to the table below for the ratio of the outer diameter Dr of the rolling ring to the diameter D of the cylinder: Cylinder diameter, m Outer diameter of the rolling ring Dr m Section height H m ＜3.5 1.25~1.19D 0.09~0.055D
≥3.5 1.21~1.17D 0.08~0.05D
Generally, Dr/D=1.17~1.2D, the ratio of the diameter of the rolling ring to the supporting wheel i=4. Increasing the ratio of the diameter of the rolling ring to the supporting wheel will result in the rolling ring.
In general, the large diameter takes the small value, and the small diameter takes the large value. Here, the number of backing plates is 20, the width of the backing plate is 450mm, the thickness of the backing plate is 40mm, the outer diameter of the rolling ring is 3.16m, and the height is 220.
Plastic dryer parameters The diameter of the supporting roller is 790, which is 800. Twelve.
Usually there is a pair of supporting rollers under a rolling ring, the center line included angle is 60 degrees. The principle of determining the width of the supporting rollers is Bt＞Br+2U
U is generally 20~40mm, generally Bt=Br+50~100mm, here is 300mm. The supporting roller adopts the spindle type supporting roller rolling bearing structure.
The thickness of the retaining wheel h is determined as H/3~2H/3 according to the section height H of the rolling ring. If h is too small, the diameter of the retaining wheel will increase, and h will be affected by the rolling ring.
The height and the installation space of the retaining wheel should not be too large. In order to reduce sliding friction loss, there should be two cones between the retaining wheel and the rolling ring for pure rolling. The semi-cone angle of the retaining wheel γ=10~18 degrees
=d gear/D roll
14. Gear configuration
The gear center distance should generally be increased, and the increment of the tooth tip clearance should be measured, generally 0.001~0.002D (D is the inner diameter of the cylinder)
15. Motor power
N=0.184D3nzρgφK KW
D=Cylinder diameter m takes 2.6 m
n = cylinder speed r/min, take 3.45 r/min
z = length of the cylinder m takes 26m ρ = density of the measured material takes 1.335T/m3
g = acceleration due to gravity
φ=fill factor, take 10%
K = copy board coefficient, take 1.5~1.6 (lift type)
That is, the calculated motor power is ≈59KW, and the actual application power should be increased by 0.1~0.3 on this basis, that is, 59~76.7
Also refer to the motor power of similar manufacturers, here is 75KW
16. Gear ring index circle diameter
D m ＜3.5 ＞3.5
df/D 1.5~1.6 1.6~1.8
Here take df/D=1.55, that is, df=4.03m. The section size of the ring gear: rim thickness δ0=2m, that is 48mm, hub thickness δ1=1.4~2m, that is 45mm, rib thickness δ2=1~1.5m, that is 36mm spoke width b =0.125~0.135B
Wheel hub width b1=0.3~0.4B i.e. 120mm 17. Modulus
N KW ＞200 200~125 100~55 50~25 ＜25 ＜10 m 45,40 40,36 35,30,28 28,25,22 20,16 10
Take 24 here Plastic dryer parameters
The number of teeth of the pinion gear z1 is generally 17~23, preferably 17,19,21 teeth, and the Z2 must be an even number. Here the pinion gear is 19 teeth, and the big gear is 168 teeth. 19. The width of the ring gear
Calculate according to the formula B≥4.29×109×N×Kj×Kdj(i+1)/d2nσ2 where: N=calculated power, KW
Kj=load concentration factor, take 1.05~1.1
Kdj=dynamic load factor, the peripheral speed below 1m/s is 1.2, greater than 1.35~1.4 σ=allowable stress, 2.42HB, MPa 20.
The inclination angle of the feed pipe is usually greater than 45 degrees, ranging from 60 to 70 degrees.
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