Screen diverter and dual comminutor with continual operation

Patent metadata

Field	Value
Publication number	US-11266994-B2
Application number	US-201816465361-A
Country	US
Kind code	B2
Filing date	Dec 21, 2018
Priority date	Dec 22, 2017
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A system for comminuting solid waste material including a casing defining a comminution chamber having two side walls and adapted for connection in a solid waste disposal channel. The system includes a first shredding device and a second shredding device disposed along a line extending perpendicular to a flow direction in the channel to form a pair of interactive shredding members. A rotating screening drum disposed within the casing upstream of the first and second shredding devices and positioned between the first and second shredding devices, the rotating screening drum configured to permit fluid to pass therethrough and to move solids toward one of the shredding devices. The rotating screening drum is configured to rotate clockwise and counter clockwise to alternately distribute solids captured thereon to one of the first and second shredding devices.

First claim

What is claimed is:

1. A system for comminuting solid waste material comprising:
a casing defining a comminution chamber having two side walls and being open on opposite sides thereof for permitting the flow of liquid therethrough bearing solid waste material and being adapted for connection in a solid waste disposal channel;
a first shredding device and a second shredding device disposed along a line extending perpendicular to a flow direction in the channel;
each of the first and second shredding devices comprising parallel first and second shredding stacks that include first and second rotating parallel shafts, the first and second rotating parallel shafts including a plurality of cutting elements mounted in an interspaced relationship such that the cutting elements on the first rotating parallel shaft are interleaved with the cutting elements on the second rotating parallel shaft, each of said cutting elements having at least one cutting tooth thereon, said cutting elements being positioned between and separated in an axial direction by spacers which are coplanar with the cutting elements of the adjacent shredding stack such that a cutting element from one shredding stack and a spacer from the other shredding stack form a pair of interactive shredding members;
a rotating screening drum disposed within the casing upstream of the first and second shredding devices and positioned between the first and second shredding devices, the rotating screening drum configured to permit fluid to pass therethrough while capturing solids on an outer surface for delivery to at least one of the first and second shredding devices, an upstream portion of the rotating screening drum disposed upstream of an upstream portion of the shredding device,
wherein the rotating screening drum is configured to rotate clockwise and counter clockwise to alternately distribute solids captured thereon to one of the first and second shredding devices.

2. The system for comminuting solid waste material according to claim 1 , further comprising an interconnect frame for connecting the first shredding device, the second shredding device and the rotating screening drum to the two side walls of the casing.

3. The system for comminuting solid waste material according to claim 2 , wherein the interconnect frame is disposed downstream of the rotating screening drum and upstream of both the first shredding device and the second shredding device.

4. The system for comminuting solid waste material according to claim 1 , wherein the rotating screening drum is connected to each of the first shredding device and the second shredding device.

5. The system for comminuting solid waste material according to claim 1 , further comprising a controller configured to control the rotation of the first shredding device, the second shredding device and the rotating screening drum.

6. The system for comminuting solid waste material according to claim 5 , wherein the controller is configured to alternate a direction of rotation of the rotating screening device periodically to balance loading on the first shredding device and the second shredding device.

7. The system for comminuting solid waste material according to claim 5 , wherein under a normal condition where no jam of either shredding device occurs, the controller rotates each shredding device in a forward direction where the cutting elements between the first and second parallel shafts move in a direction of flow in the casing.

8. The system for comminuting solid waste material according to claim 7 , wherein the controller is configured to determine whether a jam condition has occurred within one of the first or second shredding devices based on a detected current or power draw of a corresponding motor rotating the corresponding shredding device.

9. The system for comminuting solid waste material according to claim 8 , wherein the controller is configured, in response to detecting the jam condition in the one of the first and second shredding devices, reverses a direction of rotation of the one of the first and second shredding devices to a reverse direction.

10. The system for comminuting solid waste material according to claim 9 , wherein after rotating the one of the first and second shredding devices for a predetermined period of time in the reverse direction, changes the direction of rotation of the one of the first and second shredding devices to the forward direction.

11. The system for comminuting solid waste material according to claim 10 , wherein in response to detecting the jam condition after changing the direction to the forward direction, the controller is configured to reverse the direction of rotation of the one of the first and second shredding devices, and after a predetermined period of time passes in the reverse direction, the direction is again reversed to the forward direction to sense whether the jam condition has cleared.

12. The system for comminuting solid waste material according to claim 11 , in response to the jam condition being sensed multiple times, the controller is configured to transition to a safe mode in which the jammed one of the first and second shredding devices is controlled to operate in a reverse mode and the rotating screening drum is rotated in a direction to move solids to the other of the first and second shredding devices until the safe mode is cleared.

13. The system for comminuting solid waste material according to claim 12 , wherein the controller is configured to produce an alert that the system is operating in the safe mode.

14. The system for comminuting solid waste material according to claim 12 , wherein in response to it being determined that a jam condition is sensed multiple times in the other of the first and second shredding devices, the controller transitions from the safe mode to a critical mode in which both the first and second shredding devices are operated in reverse.

15. The system for comminuting solid waste material according to claim 14 , wherein the controller is configured to produce an alert that the system is operating in the critical mode.

Assignees

• Sulzer Management Ag

Inventors

• Sabol Rob
• Glauberman Corey

Classifications

• B02C2023/165

  Screen denying egress of oversize material · CPC title

• B02C18/142 Primary

  with two or more inter-engaging rotatable cutter assemblies · CPC title

• B02C25/00

  Control arrangements specially adapted for crushing or disintegrating · CPC title

• B02C18/0092 Primary

  for waste water or for garbage · CPC title

• B02C2018/164

  Prevention of jamming and/or overload · CPC title