EP0858515B1 - Exchange device for a blow lance - Google Patents

Description

The invention relates to a changing device for a Blow lance, a blow pipe and a blow pipe surrounding cooling jacket, which can be flushed with coolant has, the inlet and outlet on the one Coupling head associated end of the blowing lance arranged are, wherein the coupling head has a receptacle in which this end of the blowing lance can be inserted and which Connections for the coolant supply, the coolant discharge and the blowing fluid supply comprises the blowing lance is releasably coupled to the coupling head, wherein at least the inlet or the outlet of the cooling jacket open a peripheral surface of the blowing lance and the Inlet or outlet each assigned port on a the side surface assigned to the respective peripheral surface the recording is arranged.

Blow lances are used, for example Oxygen in a converter during the manufacture of To blow steel. The problem with such used Blow lances consist in the fact that this after a certain Service life are worn out and replaced have to.

To prevent premature damage to the blowing lance existing high in the area of the converter To avoid ambient temperatures, the blowpipe, through which the gas blown into the converter is passed is cooled by means of a coolant, usually water. For this purpose the blowing lances are usually included a double jacket, the two together connected coaxially to each other and to the blowpipe encloses arranged chambers. In the first, immediately the coolant becomes the chamber adjacent to the blowpipe initiated and then flows along the blowpipe up to almost to the top and from there through the second chamber to the outlet of the coolant jacket back.

For connecting the blowing fluid and coolant supply line and the coolant discharge line conventional blowing lances with flanges to which the lines concerned in a conventional manner can be connected. This kind of connection between the Supply and discharge lines bring one Replacing such a blow lance with the problem yourself that a significant time for loosening and Connection of the lines is required. About that it is also in such connections between the Supply or discharge lines and the blowing lance are not possible to automate the replacement process. Instead of of which must be accepted that, in order to Danger to those involved in replacing the blowing lance Installers avoid operating the blow lance for is interrupted for a long time.

The time required to replace the blow lance can be shortened with the help of a device that is in European patent application EP 0 464 427 A2 is described. In this known changing device is the section used in the previously described Blow lances for connecting the supply and Discharge lines are provided, a separate one Assigned coupling head. The coupling head is on one Frame attached, which is also a hydraulic actuatable lifting system includes. In the lifting system is the remaining part of the blowing lance can be hooked in such a way that relevant end of the blow lance in the inclusion of the Coupling head is insertable. It is both the End opening of the blowpipe as well as the inlet and outlet of the cooling jacket on the end face of the Blow lance arranged. Correspondingly, they are Connections for the coolant supply and discharge as well as the Blowing fluid supply on the face of the blowing lance assigned bottom of the receptacle of the coupling head arranged.

During the use of the known blowing lance, the hydraulic lifting device the end face the blowing lance constantly in contact with the bottom surface of the To ensure a constant seal of Blow pipe, coolant inlet and outlet to ensure. Doing this for maintaining a tight Connection considerable contact forces because of the considerable pressure with which the Coolant and the blowing fluid introduced into the blowing lance become.

A device of the type mentioned is from the European patent application EP 0 441 767 A2 known. At this device are the connections for the Coolant supply and discharge of the blowing lance together with the Connection for the blowing fluid on a side attached plate arranged. The coupling head of the known device with which the blowing lance detachable can be coupled, also has a plate, on which the connections for the blowing fluid and the Coolants are arranged in a corresponding manner. In this known device, too hydraulically operating device used to Coupling head connections tight against the connections to press the blow lance.

The known ones explained above Changing devices make it possible to use a blowing lance can be replaced within a short time. However, you have that Disadvantage that complex and both in terms of their Acquisition and maintenance costly hydraulic lifting and Crimping devices are required to be a permanent tight, secure pressing of the blowing lance against the Connections for the coolant supply and the blowing fluid guarantee.

The object of the invention is based on the above-described prior art Changing device for a blowing lance to create the with low manufacturing and maintenance costs allows quick replacement of a blowing lance.

• daß bei in die Aufnahme des Kupplungskopfes eingeführter Blaslanze das Blasrohr ineinandergreifend und dicht mit einem Rohransatz der Aufnahme verbunden ist, welcher an die Blasfluidversorgung angeschlossen ist, und
• daß bei in die Aufnahme des Kupplungskopfes eingeschobener Blaslanze im Bereich des Anschlusses für die Kühlmittelzufuhr und/oder des Anschlusses für die Kühlmittelabfuhr jeweils eine Kammer, insbesondere eine Ringkammer, ausgebildet ist.

The above-mentioned object is achieved in a changing device of the type mentioned at the outset by

• that when the blow lance is inserted into the receptacle of the coupling head, the blow pipe is interlocking and tightly connected to a pipe socket of the receptacle, which is connected to the blow fluid supply, and
• that when the lance is pushed into the receptacle of the coupling head, a chamber, in particular an annular chamber, is formed in the area of the connection for the coolant supply and / or the connection for the coolant discharge.

The inventive design of the blowing lance and Coupling head enables the sealing of the individual inputs and outputs of the blowing lance by simply insert the blowing lance into the holder accomplish. A complex holding device is after inserting the blow lance into the receptacle more needed. Electric, hydraulic or pneumatic devices for the Coupling process needed. Instead, one can simple coupling mechanism can be used, the im Area of the respective sealing surfaces Sealant always sufficient to ensure a reliable Sealing the individual connections of the blowing lance during to ensure their operation. This way is through the invention is an inexpensive to manufacture Exchange device created at high Operational safety an easy to carry out replacement the lance enables.

By in the reception of the coupling head inserted blowing lance in the area of the connection for the coolant supply and / or the connection for the Coolant discharge in each case one chamber, in particular one Annular chamber is formed. With such a designed changing device is for the Alignment of the coupling head blowing lance required Time reduced to a minimum since it is in this case is no longer required, the inlet or outlet of the Cooling jacket exactly opposite the corresponding connection position of the coupling head.

One in terms of both for the coupling head required space as well as in terms of Manufacture of the blowing lance inexpensive Embodiment of the invention is characterized in that both the inlet and the outlet of the cooling jacket open on a peripheral surface of the blowing lance.

To prevent the blowing lance from accidentally falling out of the To avoid coupling head, the blow lance should be used with the Coupling head can be releasably locked. This can be due to can be easily achieved in that the Coupling head by means of at least one pivotable the hook attached to it can be locked with the blowing lance, the hook during the insertion of the blowing lance in the inclusion of the coupling head itself in his Locked position moved. In case that at the same time the connection for the coolant supply assigned chamber the free end face of the at least the end of the blowing lance assigned to the receptacle surrounds in sections, caused by the coolant exerted on the lance towards the tip Force that the lance is held in the hook without play.

Conversely, it can also be beneficial if the Blow lance into the connection for the Coolant supply associated chamber reaching paragraph is molded onto which the coolant Pressurizing one into the inclusion of the Coupling head exerts directed force. In this case causes the pressure force exerted by the coolant, that the blowing lance is held in the receptacle.

Finally, it is advantageous if the pipe insert and the blowpipe is sealed by at least one ring seal which are connected between the Pipe approach and the blow pipe is arranged.

Fig. 1

eine Wechselvorrichtung für eine Blaslanze in einer ausschnittsweisen, teilweise aufgebrochenen frontalen Ansicht;

Fig. 2

die Wechselvorrichtung nach Figur 1 in einer ausschnittsweisen, seitlichen Ansicht.

The invention is explained in more detail below on the basis of a drawing illustrating an exemplary embodiment. Show it:

Fig. 1

a changing device for a blowing lance in a partial, partially broken frontal view;

Fig. 2

the changing device of Figure 1 in a partial side view.

The changing device shown in the figures for a Blow lance 1 has a coupling head 2, which a guide 3 adjustable in height, side and angle a frame, not shown, is attached. Of the Coupling head 2 has a first connection 4 for Blowing fluid, especially oxygen, on the at Upper side 5 of the coupling head 2 is arranged. In the connection 4 is a tube insert 6 fitted with its end assigned to the inside of the coupling head 2 6a extends into a receptacle 7.

The receptacle 7 of the coupling head is at the bottom 8 the coupling head 2 opened. In the recording 7 is from a ring insert 9 is inserted from the underside 8, which is funnel-shaped with its lower section extended to the bottom 8. In the middle section of the ring insert 9, a groove 9a is formed, which is provided with a window-like opening 9b. Upper and below the ring groove 9a are ring seals 10, 11 inserted in the grooves provided.

The opening 9b of the ring insert 9 is a second Assigned connection to which a not shown Coolant discharge line can be connected. A third Port 13 is above second port 12 arranged and also opens into the recording 7. To the Port 13 is also not shown here Coolant supply line can be connected.

The blowing lance 1 has an internal blowing tube 20, its associated with the receptacle 7 of the coupling head 2 End section 21 is expanded and one opposite the Remaining length of the blowpipe has increased wall thickness. With its end portion 21, the blowpipe 20 is on the End portion 6a of the tube insert 6 is pushed, wherein three in the axial direction of the pipe section 6 in a row arranged ring seals 23 the sealing of the interlocking sections of the tube insert 6 and ensure the blowpipe 20 from the environment.

The blow pipe 20 is in a cooling jacket 30 of the blow lance 1 used and releasably connected to this. Of the Cooling jacket 30 has a coaxial with the blowpipe 20 extending, spaced from this partition 31 through which a first chamber 32 and a second Chamber 33 are divided within the cooling jacket 30. Are connected to the first chamber 32 of the cooling jacket Inlet openings 34, which at the top, the 7th associated end of the blowing lance 1 are molded. The second chamber 33, on the other hand, opens into outlet openings 35, which is offset to the tip of the blowing lance, not shown 1 below one between the inlet openings 34 and the Outlet openings 35 formed first sealing surface 36 in the cooling jacket 30 are molded. The first and the second chamber 32, 33 of the cooling jacket are in the area of not shown tip of the blowing lance with each other connected so that the coolant, which by the Inlets 34 flows into the first chamber 32, along the blowpipe 20 to the tip of the blow lance 1 passed and from there through chamber 33 back to the Outlet openings 35 is flushed.

When blowing lance 1 is inserted into the receptacle 7 the seal 10 of the ring insert 9 on the first Sealing surface 36 of the blowing lance 1 and seals through the annular groove 9a formed an annular chamber 40 opposite one second, formed in the upper region of the receptacle 7 Chamber 41, which with the connection 13 for the Coolant supply is connected. The second chamber 41 of the Recording 7 surrounds the end face 42 of the Blow lance 1 so that the pressure of the chamber 41 applied coolant a force in the direction of not shown tip of the blowing lance 1 exerts on this.

An unintentional falling out of the blowing lance 1 from the Coupling head 2 is by the side of the coupling head 2 and pivoted about this pin 50 Prevents hook 51. The hooks 51 engage with theirs hook-shaped ends 51a around the ends of bolt-like projections 52 which are fixed to the Blow lance 1 connected retaining ring 53 are formed. The Hooks 51 have an inclined surface at their lower end 54 on. The projections 52 slide on the inclined surfaces 54 while the blowing lance 1 is being inserted into the Recess 7 along so that the hook 51 from the Conveyor path 52 is pivoted until the tip 55th have happened. Then the hook 51 falls into his Starting position back. By pressurizing the chamber 42 by means of the coolant is then the blowing lance 1 in the hook receptacle of the hook 51 pressed and held without play in this.

To replace the blowing lance 1, the blowing lance 1 is replaced the shutdown of the coolant supply in the chamber 41 in the receptacle 7 pushed in until the hook 51 is free can be pivoted. After swinging the Hook 51 can blow the lance freely from the receptacle 7 are pulled out and by a new blowing lance 1 be replaced.

Claims (6)

1. An exchange device for a blow lance (1) comprising a blow pipe (20) and a cooling jacket (30) surrounding the blow pipe (20), with cooling water able to flow through said cooling jacket (30) whose inlet and outlet (34, 35) are arranged at that end of the blow lance (1) associated with a coupling head (2); with the coupling head (2) comprising a seat (7) into which this end of the blow lance (1) is insertable, comprising the connections (4, 12, 13) for the coolant supply, the coolant removal and the blow fluid supply, with the blow lance (1) being disengageably couplable to the coupling head (2), with at least the inlet (34) or the outlet (35) of the cooling jacket (30) leading to a circumferential face of the blow lance (1) and with the connection (12, 13) associated with the respective inlet (34) or outlet (35) being arranged on a lateral face of the seat (7),
   characterised

   in that, with the blow lance (1) inserted into the seat (7) of the coupling head (2), the blow pipe (20) is connected in an interlocking manner and tightly fitting with a pipe lug (6) of the seat (7), said pipe lug (6) being connected to the blow fluid supply; and

   in that, with the blow lance (1) inserted into the seat (7) of the coupling head (2) in the region of the connection flange (12) for the coolant supply and/or the connection flange (12) for the coolant removal, in each instance a chamber (40, 41) is formed.
2. An exchange device according to claim 1,
   characterised in that both the inlet (34) and the outlet (35) of the cooling jacket (30) discharge onto a circumferential face of the blow lance (1).
3. An exchange device according to one of the preceding claims,
   characterised in that the coupling head (2) is lockable to the blow lance (1) by means of at least one hook (51) swivellably attached to said coupling head (2), and that the hook (51) during insertion of the blow lance (1) into the seat (7) of the coupling head (2), automatically moves into its locked position.
4. An exchange device according to claim 3,
   characterised in that the chamber (41) associated with the connection flange (13) for the coolant supply, at least in some sections, surrounds the free end face (42) of that end of the blow lance (2) associated with the seat (7).
5. An exchange device according to one of claims 1-3,
   characterised in that a step is arranged on the blow lance (1) which step reaches into the chamber (41) provided in the connection flange (13) for the coolant supply; when pressure is applied, the coolant exerts a force onto this step, said force being directed into the seat (7) of the coupling head (2).
6. An exchange device according to one of the preceding claims,
   characterised in that the pipe insert (6) and the blow pipe (20) of the blow lance (1) are tightly interconnected via at least one annular seal (23).

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