DE8713341U1 - Blow lance for the treatment of molten metals - Google Patents

Description

PATENT ATTORNEY 87 ²⁶⁵ MoeföSf ÜätraOe 140 D-415Ö Krefeld 1 'S" (02151) 28222 U. 20469 DH 8 53578

I I W1E3ER0L chemical-technical products GmbH, Oieseistr* IS.

4630 Bochuiii-Gerthe

Blow lance for the treatment of HtflaiT melting

The invention relates to a blowing lance for treating metal melts, consisting of a metallic lance core and a ceramic casing anchored thereto, wherein the lance core has a casing-free section for connection to a lifting device or the like and the casing forms a blowing head with outlet openings at the free end.

With such a blowing lance, inert gases or additives are introduced into a metal melt. To do this, the blowing lance is immersed in the metal melt with the blowing head and most of its casing. The part of the blowing lance immersed in the metal melt is exposed to considerable thermal stress, so the casing must be made of a high-quality ceramic material.

Nevertheless, the thermal stress leads to wear and in particular to cracking of the casing. If

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If the cracks reach the lance core, the lance is unusable and must be replaced. The used lance cannot be reused, although a not inconsiderable section of the casing, which was not immersed in the molten metal during operation, is still functional.

The object of the invention is to improve the utilization of the raw materials required for the construction of the blowing lance.

This task is solved by providing the lance core with an anchored casing only in the area subject to wear and by protecting the remaining area of the lance core up to the section without a casing by a pushed-on ceramic sleeve which is detachably attached to the lance core. The length of the push-on ceramic sleeve is preferably dimensioned so that it does not dip into the molten metal when working with the blowing lance. The sleeve can also have the same external diameter as the anchored casing. In any case, the worn blowing lance does not need to be completely replaced, but the push-on ceramic sleeve can be removed from the used sleeve and placed on a new lance and attached to it.

The slide-on sleeve can be attached using suitable fastening means, e.g. with plug-in or screw connections, also with a nut that can be screwed onto the lance core and in particular against the front face

PATENT ATTORNEY DR, STMRK ■ MOEhSER.STR. i!*0 !■ dUi5O

'S" (02161) 26222 (J. 204&9 · Q3 853678

A seal made of fibres and/or mortar can be arranged between the end faces of the sleeve and the anchored casing.

According to a preferred embodiment of the invention, the blowing head is also detachably attached to the anchored casing or the lance core. This offers the possibility of replacing the blowing head, which is subject to particular wear, as long as the anchored casing is still intact. Plug-in or screw connections can also be used to attach the blowing head.

In the following, an embodiment of the invention shown in the drawing is explained; the only figure shows, partially in section, a blowing lance for treating molten metal.

The blowing lance shown has a metallic lance core 1, e.g. a steel tube. The lance core 1 carries external anchors fc for a ceramic casing firmly anchored to it over a longer section. On the right-hand side in the figure, the lance core extends beyond the anchored casing 3. Immediately adjacent to the anchored casing, the lance core 1 is protected with a sleeve 4, which is also made of ceramic material and is pushed onto the lance core 1. A seal 5 made of mineral fibers and/or mortar is arranged between the facing end faces of the anchored casing 3 and the sleeve 4. The

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PATENT ATTORNEY DR, STARK · ftOE&SEh STR ₁ J40j ■ Ö-4.16O KREIjELD · 'B ³ (02161) 20222 U, 20469 < Qg] 853570

Sleeve 4 is fitted with a nut 6 which is screwed onto an associated

i net external thread 7 of the lance core 1 is screwed

1st, braced against the anchored casing 3,

j The lance core 1 extends with a sheath-free

> Section 8 extends beyond the sleeve 4 and bears on its

. free end an external thread 9 for attachment to

~\ finer lifting device or the like.

I ' At the opposite end of the lance extends

j the lance core 1 was approximately up to the corresponding

I Front face 10 of the anchored casing 3. There

&idigr; the lance core 1 has an internal thread 11, in

I that an associated hollow threaded pin 12 of a

&iacgr; blow head 13 can be screwed in. The blow head 13 has

Outlet openings 14, which are located above the hollow thread

; pin 11 with the hollow lance core 1 in connection

e. Between the front face 10 of the anchored

i Sheath 3 and the associated front face 15

, of the blow head 13 is a seal made of mineral fibres

\ and/or hiörtel arranged.

If the blowing head 13 wears out prematurely, it can be replaced. If the anchored casing 3 of the blowing lance is worn out, the sleeve 4 can be loosened and attached to a new blowing lance.

Claims (1)

t * r - * β · Dr.-lYig. ¹ WA-LT E'R'S TA RK PATENT ATTORNEY Moereer Straße 140 D-4150 Krefeld 1 'S" (02151) 28222 and 20469 IS 8 53578 Expectations 1. Blowing lance for the treatment of metal melts, consisting of a metallic lance core and a ceramic casing anchored thereto, the lance ^core having a casing-free section for connection to a lifting device or the like and the casing forming a blowing head with outlet openings at the free end, characterized in that the lance core (1) is only in its part subject to wear § subject area with an anchored renaming tion (3) and that the remaining area of the lance core (1) up to the jacket-free section (8) is covered by a pushed-on ceramic sleeve (4) which is detachably attached to the lance core (1). Z. Blowing lance according to claim 1, characterized in that the sleeve (4) has the same outer diameter as the anchored casing (3). 3. Blowing lance according to claim 1 or 2, characterized in that the sleeve (4) can be clamped against the end face of the anchored casing (3). t u t t i i i i i i t t i egg tie t ti &igr; Krefoid xxä/tG25 &Bgr;&iacgr;£32&oacgr;7&oacgr;&sfgr;&thgr;&oacgr;;·;8perkps$ei^qfefct scispää B[LiE 32ösöööö < Postal check £mgt\ 40&Mgr;-43&Idigr; blzmötoo« « ill PATENT ATTORNEY DR. STARK · JMOpRSEB STR. · D-415d V.REFELD · 'S" (02151) 28222 U. 20469 · (S 853578 -Z- 4. Blowing lance according to one of claims 1 to 3, characterized in that a seal (5) made of fibers and/or mortar is arranged between the end faces of the sleeve (4) and the anchored casing (3). 5. Blowing lance according to one of claims 1 to ^r - , characterized in that the blowing head (13) is detachably attached to the anchored casing or the lance core (1) is attached. &igr;# * ■ &igr; · t II 4 f I ( II * I I III * t HI I