Gearbox assembly for a twin-screw extruder, treatment installation for material treatment comprising a gearbox assembly of this type, and method for the startup of a treatment installation comprising a gearbox assembly of this type

Patent metadata

Field	Value
Publication number	US-10234013-B2
Application number	US-201514709691-A
Country	US
Kind code	B2
Filing date	May 12, 2015
Priority date	May 13, 2014
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

A gearbox assembly for a twin-screw extruder comprises a speed change gearbox for adjusting a screw shaft speed of two screw shafts of the twin-screw extruder, a distribution gearbox allowing the screw shafts to be coupled thereto, and a speed reduction gearbox. The speed change gearbox and the speed reduction gearbox are configured such as to be separable from each other, wherein the speed change gearbox is arranged at a driving end while the speed reduction gearbox couples the speed change gearbox to the distribution gearbox. Due to the fact that the speed change gearbox is configured as an individual gearbox unit arranged at the driving end, an adjustment of the screw shaft speed is easily possible by replacing the speed change gearbox. As a result, a high flexibility and productivity are obtained in the operation of the twin-screw extruder.

First claim

What is claimed is:

1. A gearbox assembly for a twin-screw extruder, comprising:
a speed change gearbox for adjusting a screw shaft speed of shafts of a twin-screw extruder;
a speed reduction gearbox; and
a distribution gearbox with two distribution gearbox output shafts allowing the screw shafts of the twin-screw extruder to be coupled thereto, wherein the speed change gearbox is arranged at a driving end, wherein the speed reduction gearbox couples the speed change gearbox to the distribution gearbox, wherein the speed reduction gearbox has precisely one speed reduction gearbox input shaft, the precisely one speed reduction gearbox input shaft having a first speed reduction gearbox gear and a speed reduction output shaft having a second speed reduction gearbox gear, the first speed reduction gearbox gear and the second speed reduction gearbox gear being in meshing engagement, wherein a speed change gearbox output shaft of the speed change gearbox is detachably connected to the precisely one speed reduction gearbox input shaft so that the speed change gearbox and the speed reduction gearbox are configured such as to be separable from each other, wherein a speed change gearbox housing of the speed change gearbox and a speed reduction gearbox housing of the speed reduction gearbox are configured such as to be separate from each other.

2. The gearbox assembly according to claim 1 , wherein the speed change gearbox has a speed change gearbox input shaft at the driving end allowing a drive motor to be detachably coupled thereto.

3. The gearbox assembly according to claim 1 , wherein the speed change gearbox output shaft has a gear disposed at the output end thereof, and wherein the speed change gearbox output shaft is mounted, by means of radial bearings, on both sides of the gear.

4. The gearbox assembly according to claim 3 , wherein the speed change gearbox output shaft is mounted to a speed change gearbox housing.

5. The gearbox assembly according to claim 1 , wherein the precisely one speed reduction gearbox input shaft has the first speed reduction gearbox gear disposed at the input end thereof, and wherein the precisely one speed reduction gearbox input shaft is mounted, by means of radial bearings, on both sides of the first speed reduction gearbox gear.

6. The gearbox assembly according to claim 5 , wherein the precisely one speed reduction gearbox input shaft is mounted to the speed reduction gearbox housing.

7. The gearbox assembly according to claim 1 , wherein a speed change gearbox input shaft and the speed change gearbox output shaft are mounted to the speed change gearbox housing, wherein the speed change gearbox housing has a connection portion for connection to the speed reduction gearbox housing, the connection portion being configured in such a way that the speed change gearbox input shaft is positionable in a plurality of angular positions relative to the speed change gearbox output shaft.

8. The gearbox assembly according to claim 1 , wherein at least one lubricant line having a predetermined separation point runs between the speed change gearbox and the speed reduction gearbox.

9. The gearbox assembly according to claim 8 , wherein the predetermined separation point of the at least one lubricant line is arranged outside the speed change gearbox housing and the speed reduction gearbox housing.

10. The gearbox assembly according to claim 1 , wherein the speed change gearbox has a coding element for reading out a gear ratio.

11. The gearbox assembly according to claim 1 , wherein the speed reduction gearbox output shaft is detachably connected to a distribution gearbox input shaft of the distribution gearbox.

12. The gearbox assembly according to claim 1 , wherein the speed reduction gearbox has the speed reduction gearbox output shaft and the second speed reduction gearbox gear is disposed at the output end thereof, and the speed reduction gearbox output shaft is mounted, by means of radial bearings, on both sides of the second speed reduction gearbox gear.

13. The gearbox assembly according to claim 12 , wherein the speed reduction gearbox output shaft is mounted to the speed reduction gearbox housing.

14. The gearbox assembly according to claim 1 , wherein the distribution gearbox has a distribution gearbox input shaft and a gear disposed at the input end thereof, and wherein the distribution gearbox input shaft is mounted, by means of radial bearings on both sides of the gear.

15. The gearbox assembly according to claim 14 , wherein the distribution gearbox input shaft is mounted to a distribution gearbox housing.

16. The gearbox assembly according to claim 1 , wherein the speed reduction gearbox housing and a distribution gearbox housing of the distribution gearbox are configured such as to be separate from each other.

17. A gearbox assembly according to claim 1 , wherein the speed reduction gearbox has a gear ration of i R defined by an input speed n R of the precisely one speed reduction gearbox input shaft and by an output speed of n V of the speed reduction gearbox output shaft, wherein the gear ratio i R is constant such that: i R =n R /n V >1.

18. A treatment installation for material treatment, comprising:
a twin-screw extruder comprising two screw shafts;
a gearbox assembly comprising a speed change gearbox for adjusting a screw shaft speed of the two screw shafts of the twin-screw extruder, a speed reduction gearbox and a distribution gearbox with two distribution gearbox output shafts allowing the screw shafts of the twin-screw extruder to be coupled thereto, wherein the speed change gearbox is arranged at a driving end, wherein the speed reduction gearbox couples the speed change gearbox to the distribution gearbox, wherein the speed reduction gearbox has precisely one speed reduction gearbox input shaft, the precisely one speed reduction gearbox input shaft having a first speed reduction gearbox gear and a speed reduction gearbox output shaft having a second speedreduction gearbox gear, the first speed reduction gearbox gear and the second speed reduction gearbox gear being in meshing engagement, wherein a speed change gearbox output shaft of the speed change gearbox gear is detachably connected to the speed reduction gearbox input shaft so that the speed change gearbox and the speed reduction gearbox are configured such as to be separable from each other, wherein a speed change gearbox housing of the speed change gearbox and a speed reduction gearbox housing of the speed reduction gearbox are configured such as to be separate from each other; and
a drive motor coupled to the speed change gearbox.

Assignees

• Coperion Gmbh

Inventors

• Wengert Bernhard
• Schleicher Raimund
• Riehle Ralf

Classifications

• B29C48/40

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

• Y10T74/19084

  Spur · CPC title

• B29B7/586

  Drives · CPC title

• B29B7/46

  with more than one shaft · CPC title

• B29C48/256

  Exchangeable extruder parts (B29C48/691 takes precedence) · CPC title