MXPA99007096A - Method and device for positioning the mouth of a consumable lance - Google Patents

Abstract

The invention relates to a method for positioning the mouth of a consumable lance designed to transport gases and/or solid substances in a metallurgical vessel filled with liquid metal, specially steel. Said method comprises the following steps:a) the lance is guided along a plane that is substantially tangent to the furnace vessel above the liquid level of the metal located in the vessel;b) the mouth area of the lance is bent inwards into the vessel in a given radius in order to bring the mouth of the lance into a fan-shaped position;and c) the lance is pushed through the sidewall of the furnace vessel inside the furnace to reach and/or to maintain the desired position of the lance mouth. The invention also relates to a device for the implementation of said method.

Description

PROCEDURE AND DEVICE FOR POSITIONING THE MOUTH OF A CONSUMABLE LANCE Description of the invention The invention relates to a method for positioning the mouth of a consumable lance designed to transport gaseous and / or solid media inside a metallurgical vessel filled with liquid metal, in particular steel, and with a device to carry out the procedure. The consumable lances are used to blow gas and / or carbon particles. From EP 0 723 129 A2 an electric arc furnace is known in which through the wall of the container both permanently installed lances as well as lances whose position can be varied are driven, and with which they are introduced on or Within the foundry the most diverse media. A manipulator that can move the orientable lance to a waiting position and an operating position is not mentioned here in more detail. DE 40 34 809 discloses a device for handling oxygen and / or carbon insufflation lances, in particular before an electric arc furnace. This device has a tower with support arm, and components with which the lances of various configurations can be moved even with the feeding hoses. Disadvantageously a manipulator of this nature requires a platform of the oven with a relatively large free space to move. To position the tip of the lance requires an expensive and technically complicated handling device. To be able to reach a defined position requires a multitude of movements of the manipulator, including changing the location of the device itself. The spears used are of predeterminable length, which after eroding to a permissible length are replaced with new spears. The invention proposed the task of creating a procedure and a device to position the mouth of a consumable lance with which the disadvantages mentioned above are avoided and with which, with simple means and a minimum use of material, it is possible to position at discretion the tip of the spear occupying a particularly small space on the platform of the furnace. This goal is achieved by the features of claim 1 of the method as well as of claim 7 of the device. The other claims are favorable improvements of the invention.

According to the invention, the lance is substantially tangentially directed with respect to the furnace container, in a plane above the level of the liquid. A relatively small opening is provided in the furnace container, in particular a slot-like opening oriented in the vertical direction. Outside the oven container, in the vicinity of the passage through the oven, the lance is bent in such a way that its front section protrudes into the oven through the wall of the oven. The mouth of the lance can be positioned so that it covers a large area of the interior of the oven, simply exerting an influence on the axis of rotation of the straight part of the tube that is substantially outside the oven, as well as on the change of the radius of the curvature and the speed of advance pushing. Depending on the erosion of the lance, it is possible to place a new piece of lance in time between the hose and the rest of the lance during production breaks. In this way almost an interminable spear is produced, being that the individual parts of the spear are consumed in each case totally. Conveniently it is possible to apply a force to the lance in the area of the curvature, which causes an elastic flexing. If the flexing force is reduced in a controlled manner, then the mouth of the lance moves elastically to the desired position. If necessary, this force can be applied in such a way as to obtain a predefinable radius the plastic deformation of the end piece of the tube is caused. The individual pieces of tube are joined substantially by sleeves or by direct bonding. Conveniently this junction point is protected by a monitoring and a reduction of the bending force to a previously determined allowable amount. The flexing device consists substantially of three rollers that are provided opposite each other on both sides of the lance. In addition to this, other guide and / or drive rollers are arranged, particularly in the straight part of the spear. To flex the lance in the area in front of the opening of passage of the wall of the furnace at least one of the rollers, and precisely the last or second to last roller in the direction of advance by thrust of the lance can move. A convenient design of the displacement unit is formed by the application of a hydraulic piston and cylinder unit. By means of the use of non-flammable liquids there is the possibility of having a component of simple construction of this kind, particularly close to the opening of the furnace passage. Additionally, it is proposed to arrange the bending and driving device of the lance on a platform. This platform is designed so that it can be tilted and / or tilted and, with suitable driving elements, it makes it possible to carry out in a particularly simple manner a discrete positioning of the lance as well as simply extracting it from the furnace. The axis of rotation of this platform is preferably arranged in such a way that an imaginary line towards the furnace container cuts at that point the wall of the furnace in which the passage is made through the container and consequently also the pitch of the lance made the inside of the oven. By this design it is possible to move the already curved lance so that the lance moves in the passage opening around a point, with the consequence that only a particularly small hole is required in the wall of the furnace. Such a small opening can be sealed with simple means. To detect the bending force for the elastic and / or plastic deformation of the end piece of the lance, a force measuring device is provided with which the bending force can be adjusted in a defined manner. If external sleeves are used to join two pieces of tube, a path measuring device is provided which signals the bending device when the sensitive connecting piece passes through the displacement unit, in order to correspondingly reduce the bending force . An example of the invention is detailed in the attached drawing. In this the figures show: Figure 1 + 2 schematic plan views of the positioning device, Figure 3 individual positions of the mouth of the lance, Figure 4 disjoint tube joints to elongate the lance. Figures 1 + 2 show a metallurgical container 11 along which a lance 21 is laterally driven. In the anterior region the lance 21 penetrates through the wall 12 of the metallurgical container 11. The lance 21 is guided by guide rollers 25 and is curved at the head end by rollers 22-24. In this case the roller 22 is connected to the displacement unit 31.

To continue advancing the lance a drive unit 34 is provided which acts on the lance 21 through drive elements 35. The drive unit 34 and the drive unit 31 are disposed on a platform 33. Figure 1 provides rotary drives that move the platform 33 about the pivot axis I. In the right part of figure 1 there is further provided a pivot axis III with which the platform 33 can be turned away from its scope of operation. In the left part of figure 2 the platform 31 is arranged so that it can swing around an imaginary line II. This line is conducted through the section point of the lance 21 with the wall 12 of the container. A plunger and cylinder unit is provided as the swing actuator 37. In the right part of figure 2 the platform 33 is supported in total on three points, namely on a joint 38 and two tilting drives 37. By means of this arrangement it is possible to position the platform 33 at discretion in the space around the joint 38. The feeding of the lance for this purpose is configured in such a way that it does not obstruct the movement. The free movement of the platform 33 allows the mouth of the lance to be easily adjusted. In the right part of the figure there is furthermore provided on the platform 33 a path measuring device 41, which is in contact with the lance 21 and by means of which any connecting pieces of the individual pieces of lance can be detected. The path measurement device 41 is connected so as to control the displacement unit 31 through an actuator 42. As outlined in the sketch, the displacement roller 22 is returned by the displacement unit 31 for so long. as the sleeve 53 is in its operation area. By this you avoid bending a defined piece of the spear. In. the left part of figure 2 is connected directly to the displacement unit 31 a force measuring station, which immediately recognizes a variation of the flexing force, for example in the area of a sleeve joining two pieces of lance and It reduces the force correspondingly. For this purpose, the force measurement device 43 and the displacement unit 31 are connected to an actuator 42. Figure 3 shows the upper part of a plane E which is above the level of the liquid metal M covered by slag S. The end of the lance 21 is represented in sketch, which can be varied in vertical direction by an angle a of fan. In the lower part a plan view is shown on the plane E with the lance 21, which in the anterior region can be bent to the radii R, with which it can vary in the horizontal direction by the angle ß of fan. Figure 4 shows the fundamental possibilities of joining between two pieces of lance, that is to say the piece 51 of lance in wear and the piece 52 of tracking of the lance: a) by means of an outer sleeve 53 b) by means of an inner sleeve 52 c) through a soldered connection.

List of parts OVEN INSTALLATION 11 Metallurgical container 12 Container wall 13 Passage through the container DRIVING THE LANCE 21 Lance 22 Roller of displacement 23, 24 Roller flexing 25 Roller guide 26 Driving station of the lance 27 Spear drive station LANCE INSTALLATION 31 Traveling unit 32 Linear force unit 33 Platform 34 Drive unit 35 Drive element 36 Rotary drive 37 Jogger 38 Articulation MEASURING DEVICE 41 Path measurement device 42 Actuator 43 Force measurement device LANCE PIPE 51 Wear-in lance tube 52 Tracking lance tube 53 Outside sleeve 54 Inside sleeve 55 Welded joint M Liquid metal S Slag I Tilting axis II Imaginary line III Swivel axis E Plane R Fan radius a Vertical angle of the fan ß Horizontal angle of the fan

Claims (1)

1. CLAIMS Method for positioning the mouth of a consumable lance designed to transport gaseous and / or solid media inside a metallurgical vessel filled with liquid metal, in particular steel, characterized by the following steps: a) the lance is essentially tangentially driven Oven container in a plane above the liquid level of the metal found in the container, b) in the area of the mouth of the lance, it is curved outside the container to the inside of the container by a predetermined radius for the fan-like positioning of the mouth of the lance, and c) is pushed through the side wall of the furnace container into the furnace interior to reach and / or maintain the desired position of the mouth of the lance. A method according to claim 1, characterized in that before its entrance into the container a force is applied to the lance causing elastic flexing. Method according to claims 1 and 2, characterized in that before its entry into the container a force is applied on the lance which causes a plastic deformation of the end piece of the tube to reach the predeterminable radius. Method according to one of claims 1 to 3, characterized in that after the desired position of the mouth of the lance is reached, the lance is still pushed at a speed that is a function of the erosion of the mouth. Method according to claim 4, characterized in that for the vertical adjustment of its mouth, the lance is rotated substantially around its longitudinal axis in the region before the point of curvature. Method according to one of claims 1 to 5, characterized in that the lance is made up of several pieces of pipe, the individual pieces of pipe being joined to each other in a form or intimate way, and that during the advance of the lance, there is no flexing of the joining points. Device for positioning the mouth of a consumable lance designed to transport gaseous and / or solid media inside a metallurgical vessel filled with liquid metal, in particular steel, where the lance is connected to gas supply units and / or solid substances , can be moved by means of conduction elements arranged outside the container and can be inserted into the container through a passage in the container according to one of the claims 6, characterized in that in a plane above the liquid metal with which the metallurgical vessel is filled, there is provided a lance driving station having at least three rollers, of which the rollers are arranged on both sides of the lance forming a triangle, and of which at least one of the rollers it can be displaced essentially perpendicular to the main axis of the lance and parallel to the plane. Device according to claim 7, characterized in that the last and / or the penultimate roller turned towards the metallurgical container is connected to a displacement unit. 9. Device according to claim 8, characterized in that the displacement unit is a linear force unit, for example a hydraulic piston and cylinder unit. Device according to one of claims 7 to 9, characterized in that the rollers and the displacement unit are arranged on a platform, of which the platform can be tilted around a tilting axis coaxially to the axis longitudinal of the straight section of the lance, and that the tilting point is on an imaginary line that divides the wall of the container in the passage of the lance through the container. Device according to one of claims 7 to 10, characterized in that, independently of the lance driving station, a lance driving station is provided having drive elements connected to a drive unit that partially surround the lance. Device according to one of claims 7 to 11, characterized in that a path measurement device is provided which detects the diameter of the lance and is connected to the displacement unit through an actuator in the form technically regulated. Device according to one of claims 7 to 12, characterized in that the displacement unit is connected to a force measuring device with which the bending force of the displacement unit can be defined in a defined manner.