Twin-screw extrusion device and processing method therefor

Patent metadata

Field	Value
Publication number	US-12427707-B2
Application number	US-202418612339-A
Country	US
Kind code	B2
Filing date	Mar 21, 2024
Priority date	Feb 4, 2024
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

A twin-screw extrusion device is disclosed, which includes a barrel and a twin-screw mechanism, the twin-screw mechanism includes a first screw, a second screw and a drive assembly, the drive assembly includes a plurality of idler gears and two mutually engaged elliptical gears, one of the elliptical gears is fixedly connected to the first screw, the other elliptical gear synchronously rotates with one of the idler gears, the last idler gear is fixedly connected to the second screw, a rotation speed of the first screw is ω 1 =N, an eccentricity of each of the elliptical gears is k, 0<k<0.8, an included angle between a connecting line of the first screw and the second screw and a long axis of each of the elliptical gears is φ, and a rotation speed of the second screw is ω 2 , satisfying

ω
2

=

(

1
-

k
2

)

⁢
N

1
-

2
⁢
k
⁢
cos
⁢
φ

+

k
2

.

First claim

What is claimed is:

1. A twin-screw extrusion device, comprising:
a barrel;
a twin-screw mechanism comprising a first screw, a second screw and a drive assembly, wherein the first screw and the second screw are both rotatably connected to the barrel, the first screw is engaged with the second screw, the drive assembly comprises a plurality of idler gears and two mutually engaged elliptical gears, one of the elliptical gears is fixedly connected to the first screw, the other elliptical gear is synchronously rotatable with one of the idler gears, the plurality of idler gears are in transmission connection, and a last one of the idler gears is fixedly connected to the second screw, so that the first screw and the second screw are rotatable in a same direction;
wherein the first screw is rotatable at a constant speed, a rotation speed of the first screw is ω 1 =N, an eccentricity of each of the elliptical gears is k, 0<k<0.8, an included angle between a connecting line of the first screw and the second screw and a long axis of each of the elliptical gears is φ, and a rotation speed of the second screw is ω 2 , satisfying

ω
2

=

(

1
-

k
2

)

⁢
N

1
-

2
⁢

k
⁢
cos

⁢
φ

+

k
2

.

2. The twin-screw extrusion device according to claim 1 , wherein an outer diameter of the first screw and the second screw is D, an outer radius of the first screw and the second screw is R, an inner diameter of the first screw and the second screw is d, and an inner radius of the first screw and the second screw is r;
a center distance between the first screw and the second screw is C, and

C
=

R
+
r

=

(

D
+
d

)

2

;

an engaged angle of the first screw and the second screw is β, and

β
=

arccos
⁢

(

C
D

)

;

a section of the first screw is formed by connecting curve arcs S 12 , S 23 , S 34 , S 45 , S 56 , S 67 , S 78 , S 89 and S 91 , and corresponding central angles are φ 1 , φ 2 +β, φ 3 , φ 4 +β, φ 5 , φ 6 +β, φ 7 , φ 8 +β and φ 9 ; a section of the second screw is formed by S′ 12 , S′ 23 , S′ 34 , S′ 45 , S′ 56 , S′ 67 , S′ 78 , S′ 89 and S′ 91 , corresponding central angels are φ′ 1 , φ′ 2 +β, φ′ 3 , φ′ 4 +β, φ′ 5 , φ 6 +β, φ′ 7 , φ′ 8 +β and φ′ 9 , a rotation center of the first screw is O, and a rotation center of the second screw is O′;
S 12 , S 56 and S 91 are a root circle arc with O as a circle center and r as a radius; S 34 and S 78 are a top circle arc with O as a circle center and r as a radius; S′ 12 , S′ 56 and S′ 91 are a top circle arc with O′ as a circle center and R as a radius; S′ 34 and S′ 78 are a root circle arc with O′ as a circle center and r as a radius;
an initial phase angle is θ 0 , 0≤θ 0 ≤360°, and K d =(1+k)/(1−k);
the central angels satisfy:

φ
1
′

=

2
⁢
a
⁢
tan
⁢

(

K
d

⁢

tan

⁡

(

φ
1

⁢
−
⁢

θ
0

2

)

)

+

2
⁢
a
⁢
tan
⁢

(

K
d

⁢

tan
⁡

(

θ
0

2

)

)

;

φ
1
′

+
β

=

2
⁢
a
⁢
tan

Assignees

• Univ Wuyi

Inventors

• Xu Baiping
• Yu Huiwen
• Tan Lingcao
• Xiao Shuping
• Huang Jiarong
• Xu Wenhua

Classifications

• B29C48/2526

  Direct drives or gear boxes · CPC title

• B29C48/64

  Screws with two or more threads · CPC title

• B29C48/59

  characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw · CPC title

• B29C48/40

  using two or more parallel screws {or at least two parallel non-intermeshing screws}, e.g. twin screw extruders · CPC title

• B29C48/832

  Heating · CPC title