WO2015001180A1 - Clamping cylinder for an electrode slipping device - Google Patents

Clamping cylinder for an electrode slipping device Download PDF

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Publication number
WO2015001180A1
WO2015001180A1 PCT/FI2014/050521 FI2014050521W WO2015001180A1 WO 2015001180 A1 WO2015001180 A1 WO 2015001180A1 FI 2014050521 W FI2014050521 W FI 2014050521W WO 2015001180 A1 WO2015001180 A1 WO 2015001180A1
Authority
WO
WIPO (PCT)
Prior art keywords
clamping
electrode
cylinder
shoe
holder ring
Prior art date
Application number
PCT/FI2014/050521
Other languages
French (fr)
Inventor
Janne Ollila
Ari Ceder
Seppo JUVONEN
Tom RÖNNBERG
Original Assignee
Outotec (Finland) Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Outotec (Finland) Oy filed Critical Outotec (Finland) Oy
Priority to US14/902,620 priority Critical patent/US10045404B2/en
Priority to EA201690003A priority patent/EA032069B1/en
Priority to EP14742562.3A priority patent/EP3017655B1/en
Priority to BR112015033041-0A priority patent/BR112015033041B1/en
Priority to CN201480038298.3A priority patent/CN105379418B/en
Publication of WO2015001180A1 publication Critical patent/WO2015001180A1/en
Priority to ZA2016/00208A priority patent/ZA201600208B/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/107—Mountings, supports, terminals or arrangements for feeding or guiding electrodes specially adapted for self-baking electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/103—Mountings, supports or terminals with jaws
    • H05B7/105—Mountings, supports or terminals with jaws comprising more than two jaws equally spaced along circumference, e.g. ring holders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/109—Feeding arrangements

Definitions

  • the invention relates to a clamping cylinder for an electrode slipping device which comprises an upper an ⁇ nular holder ring and a lower annular holder ring, both containing one or more clamping assemblies including a clamping shoe and a clamping cylinder ar- ranged in co-operation so that the clamping shoe is operable between a position where the electrode is clamped and a position where the electrode is un ⁇ damped .
  • a self-baking electrode consists of an electrode casing extending from the top of the elec ⁇ trode to below electrode contact shoes in the furnace, and an electrode portion which initially consists of a carbon based paste in the electrode casing and which is baked by electric current into an electrically con- ductive solid cylindrical form in the lower portion of the electrode casing. Electrical current is connected between three-phase electrode tips, and the arc formed between the electrodes will consume the baked elec ⁇ trode.
  • the electrode is held by a slipping device that allows controlled displacement of the electrode.
  • the slipping device generally consists of two clamping rings which are sequentially operated and moved to ex ⁇ tend the electrode as the tip of the electrode is con- sumed in use in the furnace.
  • the two rings are con ⁇ nected with hydraulic cylinders that enable relative movement between the upper and lower clamping rings. This action enables slipping through of the electrode casing whilst always maintaining a positive grip on the casing.
  • GB 262481 discloses an electrode holder in the form of a ring or frame provided with pistons by which clamp ⁇ ing pressure is exerted on the electrode. Either the clamping or releasing movement of the pistons or both of such movements can be effected by fluid pressure. Alternatively, the clamping movement of the pistons can be affected by springs .
  • US 4154974 A discloses a clamp assembly for suspending an arc furnace electrode, including a plurality of contact shoes adapted to bear against the surface of the electrode.
  • the contact shoes are pivotally mounted adjacent their upper ends.
  • Force producing means inde ⁇ pendent of the shoe support engages each contact shoe for forcing the same into high pressure engagement I with the electrode.
  • US 7075966 B2 discloses a slipping clamp assembly for holding an axially-extending electrode and for axially raising and lowering the electrode.
  • the slipping clamp assembly comprises a first slipping sleeve for exert ⁇ ing a first clamping force on the electrode, a second slipping sleeve for exerting a second clamping force on the electrode, and a slipping clamp frame to which both slipping sleeves are connected. Both slipping sleeves are axially movable relative to the frame and independent on one another.
  • US 7095777 B2 discloses an electrode slipping device arrangement including a lower electrode slip clamp surrounding the electrode and carried by a ring beam, an upper electrode slip clamp which is movable rela ⁇ tively to the lower clamp, slipping cylinders which are connected to and between both slipping clamps, and electrical load regulating cylinders which are con ⁇ nected to act between the ring beam and fixed struc ⁇ ture above the furnace roof.
  • the electrode column also includes at least one resiliently yieldable load re ⁇ sisting device which is located between the upper slip clamp and structure on the ring beam and on which the electrode, when clamped only by the upper slip clamp may totally be supported and means for measuring the load induced of the load resisting device.
  • This slip ⁇ ping device arrangement allows monitoring of the length of the electrode.
  • clamping cylinders In a slipping device comprising clamping shoes and clamping cylinders which are arranged to exert a nor ⁇ mal force on the electrode, clamping cylinders need to be removed from time to time for maintenance or re ⁇ placement purposes. Typically the clamping cylinder has to be dismantled in place, which is troublesome and time-consuming.
  • the clamping cylinder according to the present invention is characterized by what is presented in claim 1.
  • the new clamping cylinder can be connected to the annular holder ring by first fastening means and to the clamping shoe by second fastening means, and the clamping cylinder can be released from engagement with the annular holder ring by unlocking both fastening means.
  • the first and second fastening means can com ⁇ prise studs, screws, bolts, nuts, or a combination of them.
  • the clamping cylinder comprises a stationary cylinder element, which can be connected to the annular holder ring by first fastening means, and a movable cylinder element, which can be connected to the clamping shoe by second fastening means.
  • the movable cylinder element comprises drawers, which can be re ⁇ tained in contact with the clamping shoe by the second fastening means.
  • the movable cylinder element comprises a pressing piece that can be pressed against the clamping shoe to force the clamping shoe against the electrode.
  • the movements of the movable cylinder element in relation to the stationary cylinder element are effected by fluid pressure, or spring force, or both.
  • the new way of connecting the clamping cylinder to the annular holder ring and the clamping shoe allows easy removal of the clamping cylinder from the annular ring holders of the slipping device.
  • Fig. 1 is an axonometric view of a slipping device, showing one of clamping cylinders disconnected.
  • Fig. 2 is a partial and partly sectional top view of a clamping cylinder mounted in the slipping device.
  • Fig. 3 is a sectional side view of the clamping cylinder .
  • Fig. 4 is an axonometric front view of the clamping cylinder .
  • Fig. 5 is an axonometric back view of the clamping cylinder .
  • FIG 1 is a schematic illustration of a slipping de ⁇ vice 1 which can be used in connection with a self- baking electrode.
  • the slipping device 1 comprises a lower annular holder ring 2 and an upper annular hold- er ring 3 which are connected with four hydraulic cyl ⁇ inders 4 that enable relative movement between the lower annular holder ring 2 and the upper annular holder ring 3. This movement enables slipping through of the electrode, which is surrounded by the annular holder rings 2, 3, while always maintaining a positive grip on the electrode.
  • clamping shoes 5 are provided in connection with each annular holder ring 2, 3 at uniform intervals.
  • the clamping shoes 5 are concave friction plates which can be pressed against the electrode located within the annular holder rings 2, 3 to clamp the electrode.
  • Both annular holder rings 2, 3 are also provided with four spring loaded clamping cylinders 6 which can be operated to force the clamping shoes 5 into pressure contact with the electrode and to release the pressure contact between the clamping shoes 5 and the elec ⁇ trode.
  • Each clamping shoe 5 forms a clamping assembly together with a clamping cylinder 6 so that the clamping shoe 5 can be forced into pressure contact with the electrode and released from pressure contact with the electrode by the action of the clamping cylinder 6.
  • the slipping device 1 also comprises hy ⁇ draulic equipment needed for proper operation of the hydraulic cylinders 4 and the hydraulically operated, spring loaded clamping cylinders 6.
  • the clamping shoes 5 of the lower annular holder ring 2 are released from pressing against the electrode. This can be done by means of hydraulically operated, spring loaded clamping cylinders 6.
  • the electrode is now sus ⁇ pended only by the clamping shoes 5 of the upper annu ⁇ lar holder ring 3.
  • the lower annular holder ring 2 is lowered in relation to the upper annular holder ring 3 by means of the hydraulic cylinders 4.
  • the clamping shoes 5 of the lower annular holder ring 2 are pressed against the electrode by means of the spring loaded clamping cylinders 6 of the lower annu ⁇ lar holder ring 2.
  • the structure of a spring loaded clamping cylinder 6 is illustrated in more detail in Figures 3-5.
  • the clamping cylinder 6 comprises a spring cylinder housing 8, which is connected to a spring cylinder head 9 by means of four spring cylinder drawbars 10 and locking nuts 11 fixed at the outer ends of the drawbars 10.
  • a spring cylinder piston 12 is fastened to the inner surface of the spring cylinder head 9 by means of a fastening screw 14.
  • a disk spring 13 is located in the spring cylinder housing 8.
  • the spring cylinder housing 8, spring cylinder head 9 and spring cylinder drawbars 10 together form a movable cylinder element 7.
  • a stationary cylinder element 15 is arranged on the spring cylinder drawbars 10 between the spring cylinder housing 8 and the spring cylinder head 9.
  • the sta- tionary cylinder element 15 comprises a first cylinder portion 16 enveloping the disk spring 13 from inward, a second cylinder portion 17 enveloping the spring cylinder piston 12 from outward, and a flange portion 18 connecting the first cylinder portion 16 to the se- cond cylinder portion 17.
  • the flange portion 18 is provided with a first fluid passage 19 and a second fluid passage 20, which are connectable to the hydrau- lie system, and a fluid chamber 21 confined between the spring cylinder piston 12 and the flange portion 18.
  • the annular gap between the spring cylinder head 9 and the flange portion 18 is covered and sealed by a piston protection sealing 26.
  • the stationary cylinder element 15 can be secured to the annular holder ring 3 by means of bolts 27 (Fig.
  • the spring cylinder housing 8, the spring cylinder head 9 and the spring cylinder drawbars 10 make up a movable element 7 that can slide a small distance closer to the electrode (to the left in Fig. 3) and farther off from the electrode (to the right in Fig.
  • a spring cylinder pressing piece 22 is fastened into an end plate 23 of the spring cylinder housing 8.
  • the pressing piece 22 exerts a clamping force to a force receiving part 31 in the clamping shoe 5 (Fig. 2) .
  • four drawers 24 for drawing the clamping shoe 5 apart from the electrode are fastened into the end plate 23.
  • the drawers 24 are provided with L-shaped locking ends which enable an ⁇ choring the spring cylinder housing 8 to the clamping shoe 5 with locking screws 28 (Fig. 2) .
  • the coupling between the drawers 24 and the clamping shoe 5 can be dismantled by removing the locking screws 28.
  • the fluid chamber 21 between the flange portion 18 and the spring cylinder piston 12 is filled with hydraulic fluid, which forces the movable element 7 to slide to the right against the force of the disk spring 13.
  • the spring cylinder housing 8 is connected to the clamping shoe 5
  • the movement of the spring cylinder piston 12 to the right reduces the pressure that is exerted to the electrode by the clamping shoe 5.
  • the pressure contact between the electrode and the clamping shoes 5 is released. This allows displacement of the annular holder ring 2 or 3 so that the electrode can be low ⁇ ered or raised a small distance.
  • the steps of removing a clamping cylinder 6 from an annular holder ring 2, 3 will be discussed in the following .
  • the number of clamping assemblies in an annular holder ring 2, 3 can be different from four.
  • any other suitable fastening means can be used for detachably connecting the movable cylinder element 7 to the clamping shoe 5.
  • any other suitable fastening means can be used for detachably connecting the sta- tionary cylinder element 15 to the annular holder ring 2, 3.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Clamps And Clips (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

An electrode slipping device comprises an upper holder (3) and a lower holder, both holders (3) containing one or more clamping shoes (5) and one or more clamping cylinders (6) in co-operation with the clamping shoes (5).The clamping shoes (5) are operable between a position where the electrode is clamped and a position where the electrode is unclamped. The clamping cylinder (6) is connected to the electrode holder (3) by first fastening means (27) and to the clamping shoe (5) by second fastening means (28) such that the clamping cylinder (6) can be released from engagement with the holder (3) by unlocking both sets of fastening means (27, 28).

Description

CLAMPING CYLINDER FOR AN ELECTRODE SLIPPING DEVICE
FIELD OF THE INVENTION The invention relates to a clamping cylinder for an electrode slipping device which comprises an upper an¬ nular holder ring and a lower annular holder ring, both containing one or more clamping assemblies including a clamping shoe and a clamping cylinder ar- ranged in co-operation so that the clamping shoe is operable between a position where the electrode is clamped and a position where the electrode is un¬ damped . BACKGROUND OF THE INVENTION
The majority of electrodes used in electric arc fur¬ naces are self-baking electrodes, so called Soderberg electrodes. A self-baking electrode consists of an electrode casing extending from the top of the elec¬ trode to below electrode contact shoes in the furnace, and an electrode portion which initially consists of a carbon based paste in the electrode casing and which is baked by electric current into an electrically con- ductive solid cylindrical form in the lower portion of the electrode casing. Electrical current is connected between three-phase electrode tips, and the arc formed between the electrodes will consume the baked elec¬ trode. The electrode is held by a slipping device that allows controlled displacement of the electrode.
The slipping device generally consists of two clamping rings which are sequentially operated and moved to ex¬ tend the electrode as the tip of the electrode is con- sumed in use in the furnace. The two rings are con¬ nected with hydraulic cylinders that enable relative movement between the upper and lower clamping rings. This action enables slipping through of the electrode casing whilst always maintaining a positive grip on the casing. GB 262481 discloses an electrode holder in the form of a ring or frame provided with pistons by which clamp¬ ing pressure is exerted on the electrode. Either the clamping or releasing movement of the pistons or both of such movements can be effected by fluid pressure. Alternatively, the clamping movement of the pistons can be affected by springs .
US 4154974 A discloses a clamp assembly for suspending an arc furnace electrode, including a plurality of contact shoes adapted to bear against the surface of the electrode. The contact shoes are pivotally mounted adjacent their upper ends. Force producing means inde¬ pendent of the shoe support engages each contact shoe for forcing the same into high pressure engagement I with the electrode.
US 7075966 B2 discloses a slipping clamp assembly for holding an axially-extending electrode and for axially raising and lowering the electrode. The slipping clamp assembly comprises a first slipping sleeve for exert¬ ing a first clamping force on the electrode, a second slipping sleeve for exerting a second clamping force on the electrode, and a slipping clamp frame to which both slipping sleeves are connected. Both slipping sleeves are axially movable relative to the frame and independent on one another.
US 7095777 B2 discloses an electrode slipping device arrangement including a lower electrode slip clamp surrounding the electrode and carried by a ring beam, an upper electrode slip clamp which is movable rela¬ tively to the lower clamp, slipping cylinders which are connected to and between both slipping clamps, and electrical load regulating cylinders which are con¬ nected to act between the ring beam and fixed struc¬ ture above the furnace roof. The electrode column also includes at least one resiliently yieldable load re¬ sisting device which is located between the upper slip clamp and structure on the ring beam and on which the electrode, when clamped only by the upper slip clamp may totally be supported and means for measuring the load induced of the load resisting device. This slip¬ ping device arrangement allows monitoring of the length of the electrode.
In a slipping device comprising clamping shoes and clamping cylinders which are arranged to exert a nor¬ mal force on the electrode, clamping cylinders need to be removed from time to time for maintenance or re¬ placement purposes. Typically the clamping cylinder has to be dismantled in place, which is troublesome and time-consuming.
OBJECTIVE OF THE INVENTION
It is an objective of the present invention to provide a clamping cylinder which is easy to remove from its place and replace with another cylinder.
SUMMARY OF THE INVENTION The clamping cylinder according to the present invention is characterized by what is presented in claim 1.
The new clamping cylinder can be connected to the annular holder ring by first fastening means and to the clamping shoe by second fastening means, and the clamping cylinder can be released from engagement with the annular holder ring by unlocking both fastening means. The first and second fastening means can com¬ prise studs, screws, bolts, nuts, or a combination of them. According to one aspect of the invention the clamping cylinder comprises a stationary cylinder element, which can be connected to the annular holder ring by first fastening means, and a movable cylinder element, which can be connected to the clamping shoe by second fastening means.
According to one aspect of the invention the movable cylinder element comprises drawers, which can be re¬ tained in contact with the clamping shoe by the second fastening means.
According to one aspect of the invention the movable cylinder element comprises a pressing piece that can be pressed against the clamping shoe to force the clamping shoe against the electrode.
According to one aspect of the invention the movements of the movable cylinder element in relation to the stationary cylinder element are effected by fluid pressure, or spring force, or both.
The new way of connecting the clamping cylinder to the annular holder ring and the clamping shoe allows easy removal of the clamping cylinder from the annular ring holders of the slipping device.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to pro- vide a further understanding of the invention and constitute a part of this specification, illustrate em¬ bodiments of the invention and together with the de- scription help to explain the principles of the inven¬ tion. In the drawings:
Fig. 1 is an axonometric view of a slipping device, showing one of clamping cylinders disconnected.
Fig. 2 is a partial and partly sectional top view of a clamping cylinder mounted in the slipping device. Fig. 3 is a sectional side view of the clamping cylinder .
Fig. 4 is an axonometric front view of the clamping cylinder .
Fig. 5 is an axonometric back view of the clamping cylinder .
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 is a schematic illustration of a slipping de¬ vice 1 which can be used in connection with a self- baking electrode. The slipping device 1 comprises a lower annular holder ring 2 and an upper annular hold- er ring 3 which are connected with four hydraulic cyl¬ inders 4 that enable relative movement between the lower annular holder ring 2 and the upper annular holder ring 3. This movement enables slipping through of the electrode, which is surrounded by the annular holder rings 2, 3, while always maintaining a positive grip on the electrode.
Four clamping shoes 5 are provided in connection with each annular holder ring 2, 3 at uniform intervals. The clamping shoes 5 are concave friction plates which can be pressed against the electrode located within the annular holder rings 2, 3 to clamp the electrode. Both annular holder rings 2, 3 are also provided with four spring loaded clamping cylinders 6 which can be operated to force the clamping shoes 5 into pressure contact with the electrode and to release the pressure contact between the clamping shoes 5 and the elec¬ trode. Each clamping shoe 5 forms a clamping assembly together with a clamping cylinder 6 so that the clamping shoe 5 can be forced into pressure contact with the electrode and released from pressure contact with the electrode by the action of the clamping cylinder 6.
Furthermore, the slipping device 1 also comprises hy¬ draulic equipment needed for proper operation of the hydraulic cylinders 4 and the hydraulically operated, spring loaded clamping cylinders 6.
The operation principle of the slipping device 1 will be discussed in the following.
In the beginning, all the clamping shoes 5 of the up¬ per annular holder ring 3 and lower annular holder ring 2 are in pressure contact with the electrode, clamping the electrode against the gravitational force.
When there is a need to lower the electrode, the clamping shoes 5 of the lower annular holder ring 2 are released from pressing against the electrode. This can be done by means of hydraulically operated, spring loaded clamping cylinders 6. The electrode is now sus¬ pended only by the clamping shoes 5 of the upper annu¬ lar holder ring 3. The lower annular holder ring 2 is lowered in relation to the upper annular holder ring 3 by means of the hydraulic cylinders 4. After that, the clamping shoes 5 of the lower annular holder ring 2 are pressed against the electrode by means of the spring loaded clamping cylinders 6 of the lower annu¬ lar holder ring 2.
Thereafter the same procedure is repeated with the clamping shoes 5 of the upper annular holder ring 3.
Finally, the electrode is again held in place with the help of the clamping shoes 5 of both annular holder rings 2, 3, until a new need arises to lower the elec- trode again.
The structure of a spring loaded clamping cylinder 6 is illustrated in more detail in Figures 3-5. The clamping cylinder 6 comprises a spring cylinder housing 8, which is connected to a spring cylinder head 9 by means of four spring cylinder drawbars 10 and locking nuts 11 fixed at the outer ends of the drawbars 10. A spring cylinder piston 12 is fastened to the inner surface of the spring cylinder head 9 by means of a fastening screw 14. A disk spring 13 is located in the spring cylinder housing 8. The spring cylinder housing 8, spring cylinder head 9 and spring cylinder drawbars 10 together form a movable cylinder element 7.
A stationary cylinder element 15 is arranged on the spring cylinder drawbars 10 between the spring cylinder housing 8 and the spring cylinder head 9. The sta- tionary cylinder element 15 comprises a first cylinder portion 16 enveloping the disk spring 13 from inward, a second cylinder portion 17 enveloping the spring cylinder piston 12 from outward, and a flange portion 18 connecting the first cylinder portion 16 to the se- cond cylinder portion 17. The flange portion 18 is provided with a first fluid passage 19 and a second fluid passage 20, which are connectable to the hydrau- lie system, and a fluid chamber 21 confined between the spring cylinder piston 12 and the flange portion 18. The annular gap between the spring cylinder head 9 and the flange portion 18 is covered and sealed by a piston protection sealing 26.
The stationary cylinder element 15 can be secured to the annular holder ring 3 by means of bolts 27 (Fig.
2) . The spring cylinder housing 8, the spring cylinder head 9 and the spring cylinder drawbars 10 make up a movable element 7 that can slide a small distance closer to the electrode (to the left in Fig. 3) and farther off from the electrode (to the right in Fig.
3) .
A spring cylinder pressing piece 22 is fastened into an end plate 23 of the spring cylinder housing 8. In a clamping situation, the pressing piece 22 exerts a clamping force to a force receiving part 31 in the clamping shoe 5 (Fig. 2) . Also four drawers 24 for drawing the clamping shoe 5 apart from the electrode are fastened into the end plate 23. The drawers 24 are provided with L-shaped locking ends which enable an¬ choring the spring cylinder housing 8 to the clamping shoe 5 with locking screws 28 (Fig. 2) . The coupling between the drawers 24 and the clamping shoe 5 can be dismantled by removing the locking screws 28.
The operation principle of the clamping cylinder 6 will be discussed in the following.
Normally the spring force of the disk spring 13 keeps the spring cylinder pressing piece 22 pressed against the clamping shoe 5 so that the clamping shoe 5 is clamped against the electrode. Four clamping cylinders 6 are arranged symmetrically around the electrode cas- ing and the clamping forces created by each clamping cylinder 6 should be equal.
To release the clamping pressure, the fluid chamber 21 between the flange portion 18 and the spring cylinder piston 12 is filled with hydraulic fluid, which forces the movable element 7 to slide to the right against the force of the disk spring 13. As the spring cylinder housing 8 is connected to the clamping shoe 5, the movement of the spring cylinder piston 12 to the right reduces the pressure that is exerted to the electrode by the clamping shoe 5. As the similar procedure is carried out in connection with each clamping cylinder 6 of the same annular holder ring 2 or 3, the pressure contact between the electrode and the clamping shoes 5 is released. This allows displacement of the annular holder ring 2 or 3 so that the electrode can be low¬ ered or raised a small distance. The steps of removing a clamping cylinder 6 from an annular holder ring 2, 3 will be discussed in the following .
First, all the clamping cylinders 6 of the same holder ring 2, 3 are pressurized with hydraulic fluid so that the pressure in the fluid chamber 21 urges the movable cylinder element 7 to a position most distant from the clamping shoe 5. In this position, the pressure exert¬ ed by the spring cylinder pressing piece 22 to the force receiving part 31 in the clamping shoe 5 is at its lowest.
Then, locking screws 28 locking the drawers 24 of the movable cylinder element 7 to the clamping shoe 5 are released. Then, bolts 27 locking the flange portion 18 of the stationary cylinder element 15 to the annular holder ring 2, 3 are released. Finally, the hydraulic system is disconnected and the hydraulic hoses are disengaged from the clamping cyl¬ inder 6, after which the clamping cylinder 6 can be removed from the annular holder ring 3 as illustrated in Fig . 1.
The number of clamping assemblies in an annular holder ring 2, 3 can be different from four.
Instead of the locking screws 28, any other suitable fastening means can be used for detachably connecting the movable cylinder element 7 to the clamping shoe 5.
Instead of the bolts 27, any other suitable fastening means can be used for detachably connecting the sta- tionary cylinder element 15 to the annular holder ring 2, 3.
Although the above example teaches pressurizing the clamping shoe 5 by spring force and releasing the pressure by hydraulic force, it could also be possible to pressurize by hydraulic force and depressurize by spring force. Instead of hydraulic force, also pneu¬ matic force could be used. Above the invention has been described by way of exam¬ ples with reference to the exemplifying embodiments and implementations illustrated in the accompanying drawings. The invention is, however, not confined to the exemplifying embodiments shown in the drawings alone but it rather covers various modifications and equivalent arrangements, which fall within the scope of the following claims.

Claims

1. A clamping cylinder (6) for an electrode slipping device which comprises an upper annular holder ring (3) and a lower annular holder ring (2), both containing one or more clamping assemblies including a clamping shoe (5) and a clamping cylinder (6) arranged in co-operation so that the clamping shoe (5) is operable between a position where the electrode is clamped and a position where the electrode is undamped, characterized in that the clamping cylinder (6) is connecta- ble to the annular holder ring (2, 3) by first fas¬ tening means (27) and to the clamping shoe (5) by se¬ cond fastening means (28), and that the clamping cyl- inder (6) can be released from engagement with the an¬ nular holder ring (2, 3) by unlocking both fastening means (27, 28) .
2. The clamping cylinder (6) of claim 1, characterized in that the clamping cylinder (6) comprises a stationary cylinder element (15), which is connectable to the annular holder ring (2, 3) by first fastening means
(27) , and a movable cylinder element (7), which is connectable to the clamping shoe (5) by second fas- tening means (28) .
3. The clamping cylinder (6) of claim 1 or 2, characterized in that the first and second fastening means (27, 28) comprise studs, screws, bolts, nuts, or a combination of them.
4. The clamping cylinder (6) of claim 2 or 3, characterized in that the movable cylinder element (7) com¬ prises drawers (24) can be retained in contact with the clamping shoe (5) by the second fastening means
(28) .
5. The clamping cylinder (6) of claim 2 or 3, characterized in that the movable cylinder element (7) com¬ prises a pressing piece (22) that can be pressed against the clamping shoe (5) to force the clamping shoe (5) against the electrode.
6. The clamping cylinder of any one of the preceding claims, characterized in that the movements of the movable cylinder element (7) in relation to the sta- tionary cylinder element (15) are effected by fluid pressure, or spring force, or both.
PCT/FI2014/050521 2013-07-05 2014-06-25 Clamping cylinder for an electrode slipping device WO2015001180A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US14/902,620 US10045404B2 (en) 2013-07-05 2014-06-25 Clamping cylinder for an electrode slipping device
EA201690003A EA032069B1 (en) 2013-07-05 2014-06-25 Clamping cylinder for an electrode slipping device
EP14742562.3A EP3017655B1 (en) 2013-07-05 2014-06-25 Clamping cylinder for an electrode slipping device
BR112015033041-0A BR112015033041B1 (en) 2013-07-05 2014-06-25 GRIP CYLINDER FOR AN ELECTRODE SLIDING DEVICE
CN201480038298.3A CN105379418B (en) 2013-07-05 2014-06-25 Clamping cylinder for Electrode Fluctuation Device
ZA2016/00208A ZA201600208B (en) 2013-07-05 2016-01-11 Clamping cylinder for an electrode slipping device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20135746 2013-07-05
FI20135746A FI125074B (en) 2013-07-05 2013-07-05 Clamping cylinder for electrode control device

Publications (1)

Publication Number Publication Date
WO2015001180A1 true WO2015001180A1 (en) 2015-01-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2014/050521 WO2015001180A1 (en) 2013-07-05 2014-06-25 Clamping cylinder for an electrode slipping device

Country Status (9)

Country Link
US (1) US10045404B2 (en)
EP (1) EP3017655B1 (en)
CN (1) CN105379418B (en)
BR (1) BR112015033041B1 (en)
EA (1) EA032069B1 (en)
FI (1) FI125074B (en)
SA (1) SA516370353B1 (en)
WO (1) WO2015001180A1 (en)
ZA (1) ZA201600208B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018154173A1 (en) * 2017-02-27 2018-08-30 Outotec (Finland) Oy Electrode slipping device
WO2023141528A1 (en) * 2022-01-24 2023-07-27 Veolia Nuclear Solutions, Inc. Systems and methods for electrode feeders and electrode seals

Families Citing this family (1)

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EA032069B1 (en) 2019-04-30
EP3017655B1 (en) 2020-06-17
CN105379418B (en) 2019-03-08
EP3017655A1 (en) 2016-05-11
BR112015033041B1 (en) 2021-12-28
EA201690003A1 (en) 2016-08-31
FI20135746A (en) 2015-01-06
CN105379418A (en) 2016-03-02
US20160205729A1 (en) 2016-07-14
FI125074B (en) 2015-05-29
ZA201600208B (en) 2018-12-19
BR112015033041A2 (en) 2017-07-25
US10045404B2 (en) 2018-08-07

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