Method and system for comminuting grinding stock using a roller mill

Patent metadata

Field	Value
Publication number	US-10464072-B2
Application number	US-201314415606-A
Country	US
Kind code	B2
Filing date	Jul 3, 2013
Priority date	Jul 19, 2012
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

The invention relates to a method and an apparatus for comminuting grinding stock with a roller mill, wherein a grinding plate cooperates with at least two grinding rollers and the grinding stock supplied in the mass flow is comminuted between grinding plate and grinding roller. At least two grinding rollers are driven via dedicated drives, wherein a power compensation control is carried out for the drives of the grinding rollers, such that the power of the drives is controlled in a predefined ratio to one another. The power control is then effected by changing the mass flow of the grinding stock supplied to at least one of the grinding rollers.

First claim

The invention claimed is:

1. A method for comminuting grinding stock with a roller mill, the method comprising a grinding plate cooperating with at least two grinding rollers to comminute grinding stock between the grinding plate and the at least two grinding rollers, wherein the at least two grinding rollers are driven via dedicated drives and a power compensation control is carried out for the drives of the at least two grinding rollers such that power consumption of the drives is controlled in a predefined ratio to one another,
wherein controlling the power consumption is effected by changing a mass flow of the grinding stock supplied to at least one of the at least two grinding rollers such that a first mass flow of the grinding stock delivered to a first grinding roller of the at least two grinding rollers is different from a second mass flow of the grinding stock delivered to a second grinding roller of the at least two grinding rollers.

2. The method as claimed in claim 1 wherein a torque and/or a rotational speed of the drives is used as a control variable for the power compensation control.

3. The method as claimed in claim 1 wherein changing the mass flow of the grinding stock comprises at least one of
influencing an orientation of the first mass flow of the grinding stock with respect to the first grinding roller,
influencing a breadth of the first mass flow of the grinding stock with respect to the first grinding roller, or
influencing a height of the first mass flow of the grinding stock with respect to the first grinding roller.

4. The method as claimed in claim 1 comprising pre-compressing the grinding stock supplied in the first mass flow to the first grinding roller.

5. The method as claimed in claim 1 comprising loosening the grinding stock supplied in the first mass flow to the first grinding roller.

6. The method as claimed in claim 1 wherein the power consumption of the drives is controlled such that an operating torque of each of the drives lies between zero and a breakdown torque of the drives.

7. The method as claimed in claim 1 wherein changing the mass flow of the grinding stock comprises changing a composition of the grinding stock in at least one of the first or second mass flows.

8. The method as claimed in claim 7 wherein the composition of the grinding stock is changed by adding grinding assistants and/or water and/or additives.

9. The method as claimed in claim 7 wherein the composition of the grinding stock is changed by adding coarse material and/or fresh material and/or circulating material and/or smalls and/or finished material.

10. The method of claim 1 , comprising changing the first mass flow of the grinding stock supplied to the first grinding roller by influencing a volumetric rate at which the grinding stock is supplied to the first grinding roller.

11. The method of claim 1 wherein changing the mass flow of the grinding stock is effected by at least one of
influencing an orientation of only the first mass flow of the grinding stock,
influencing a breadth of only the first mass flow of the grinding stock, or
influencing a height of only the first mass flow of the grinding stock.

12. An apparatus for comminuting grinding stock, the apparatus comprising a roller mill which has a grinding plate and at least two grinding rollers cooperating with the grinding plate, wherein the grinding stock is comminuted between grinding plate and the at least two grinding rollers, wherein the at least two grinding rollers each have a dedicated drive and wherein a power compensation control device for the drives of the at least two grinding rollers is provided for controlling power consumption of the drives in a predefined ratio with respect to one another,
wherein the power compensation control device cooperates with at least one actuator to change a mass flow of the grinding stock supplied to at least one of the at least two grinding rollers such that a first mass flow of the grinding stock delivered to a first grinding roller of the at least two grinding rollers is different from a second mass flow of the grinding stock delivered to a second grinding roller of the at least two grinding rollers.

13. The apparatus as claimed in claim 12 wherein the power compensation control device is operatively connected to at least one of
torque sensors to detect a torque of each of the drives
rotational speed sensors to detect a rotational speed of each of the drives.

14. The apparatus as claimed in claim 12 wherein the drives are unregulated three-phase asynchronous electric motors.

Assignees

• Thyssenkrupp Ind Solutions Ag

Inventors

• Guerrero Palma Pedro
• Könning Ludwig

Classifications

• B02C23/02

  Feeding devices ({for grain mills B02C11/04; for roller mills B02C4/286}; transport devices in general B65G) · CPC title

• B02C15/007

  Mills with rollers pressed against a rotary horizontal disc (with pendularly mounted rollers B02C15/04) · CPC title

• B02C25/00 Primary

  Control arrangements specially adapted for crushing or disintegrating · CPC title

• B02C15/02

  Centrifugal pendulum-type mills · CPC title