Method and system for measuring clamping pressure in an electrode slipping device

Patent metadata

Field	Value
Publication number	US-2016138982-A1
Application number	US-201414902027-A
Country	US
Kind code	A1
Filing date	Jun 25, 2014
Priority date	Jul 5, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

A method and a system for monitoring clamping pressure exerted by a clamping cylinder to an electrode in an electrode slipping device which comprises an upper annular holder ring and a lower annular holder ring, each comprising at least one clamping assembly including a clamping shoe and clamping cylinder arranged in co-operation so that the clamping shoe is forced into pressure contact with the electrode and released from pressure contact with the electrode by the action of the clamping cylinder. The measuring system comprises a force sensor ( 30 ) mounted in connection with a pressing piece ( 22 ) that transmits the force created by the clamping cylinder to the clamping shoe. The force sensor can be a strain gage ( 30 ) mounted in a cavity ( 25 ) provided in the pressing piece ( 22 ) or a load cell mounted between the pressing piece ( 22 ) and the clamping cylinder.

First claim

1 . A method for monitoring the clamping pressure exerted by a clamping cylinder to an electrode in an electrode slipping device which comprises an upper annular holder ring and a lower annular holder ring, each comprising at least one clamping assembly including a clamping shoe and a clamping cylinder arranged in co-operation so that the clamping shoe is forced into pressure contact with the electrode and released from pressure contact with the electrode by the action of the clamping cylinder, wherein said method for monitoring is conducted by mounting a force sensor in connection with a pressing piece that transmits the force created by the clamping cylinder to the clamping shoe, collecting data received from the force sensor, and monitoring the clamping pressure on the basis of the data received from the force sensor.

2 . A method according to claim 1 , wherein a strain gage is used as a force sensor.

3 . A method according to claim 2 , wherein the pressing piece is provided with a cavity and the strain gage is mounted into the cavity such that the strain gage is located close to the neutral axis of the pressing piece.

4 . A method according to claim 1 , wherein a load cell is used as a force sensor and the load cell is mounted between the pressing piece and the clamping shoe.

5 . A method according to claim 1 , wherein a load cell is used as a force sensor and the load cell is mounted between the pressing piece and an end plate of the clamping cylinder.

6 . A system for monitoring the clamping pressure exerted by a clamping cylinder to an electrode in an electrode slipping device which comprises an upper annular holder ring and a lower annular holder ring, each comprising at least one clamping assembly including a clamping shoe and a clamping cylinder arranged in co-operation so that the clamping shoe can be forced into pressure contact with the electrode and released from pressure contact with the electrode by the action of the clamping cylinder, and a force sensor provided in connection with a pressing piece that transmits the force created by the clamping cylinder to the clamping shoe.

7 . A system according to claim 6 , wherein the force sensor is a strain gage mounted on the pressing piece.

8 . A system according to claim 7 , wherein the pressing piece is provided with a cavity and that the strain gage is mounted in the cavity so that the strain gage is located close to and parallel to the neutral axis of the pressing piece.

9 . A system according to claim 6 , wherein the force sensor is a load cell which is mounted between the pressing piece and the clamping shoe.

10 . A system according to claim 6 , wherein the force sensor is a load cell which is mounted between the pressing piece and an end plate of the clamping cylinder.

Assignees

• Outotec Finland Oy

Inventors

• Ollila Janne
• Ceder Ari
• Juvonen Seppo
• Rönnberg Tom

Classifications

• G01L1/22 Primary

  using resistance strain gauges · CPC title

• H05B7/107 Primary

  specially adapted for self-baking electrodes · CPC title

• H05B7/152

  by electromechanical means for positioning of electrodes · CPC title

• H05B7/109

  Feeding arrangements (H05B7/107 takes precedence; where the electrode movement is part of a closed loop for automatic control of power H05B7/148) · CPC title