KR20000005062A - Device for trimming slab - Google Patents

Abstract

PURPOSE: A trimming device is provided to secure an efficient trimming for practically removing every splinters. CONSTITUTION: A trimming device includes:more than one blade(11) possibly moving toward a cross direction from the moving direction(F1) of a slab(3); first propelling apparatuses(19, 20) for moving the blade toward the orbit of the slab; a peeler(4) being located in the upper unit of the blade from the moving direction; a second propelling instrument(8) operating to the peeler toward a detecting location; and a braking instrument(17) being connected to the peeler for locating the blade out of the orbit of the slab in the retreat location of the peeler.

Description

Trimming device of slab

The present invention relates to a trimming device for steel slabs or similar flat metal products, which consists in desealing seams present at the ends of the slab, in particular before laminating the slabs.

The method of making a classic steel sheet article consists of continuously casting liquid steel in a continuous casting mold. At the exit of the casting device, the still hot steel ribbon is cut into pieces of various lengths called slabs as needed. This cutting is classically done quickly, that is, during the advancing of the ribbon, using an oxygen cutter perpendicular to the advancing direction.

The cutting causes oxygen cutting marks at the two ends of the slab so cut, ie the head and the tail, which are particularly important at the bottom side, i.e. in the direction from which the flame of the blowtorch escapes. The weakening grime over the entire width of the flame is usually 20 to 50 mm in width and 10 to 15 mm in thickness.

However, due to the oxygen cleavage, the constituent metal of the grout has a different chemical composition and mechanical properties than the steel of the slab. Thus, not only to prevent all defects on the stacked article, but also to damage the stacked cylinder along its length, or to accidentally fall off during stacking, and to accumulate in several places of the lamination tools and after a period of time It must be removed before hot rolling to avoid the risk of causing a malfunction.

Several methods are already known and used in the industry to suppress such traces. One method is to remove the burls from the still hot slab, either by slicing or hammering with a cutting disc immediately after cutting at the exit of the continuous casting, which is then trimmed to the same degree as the continuous casting line. Needs a device.

Another trimming device is located before introducing the slab into the hot rolling mill, but this also requires the devices as well as the flow of the various slabs.

Several trimming systems have already been proposed. That is, document FR-A-2,553,318 describes a trimming machine comprising a double blade blade installed on the oscillating arm and extending laterally in the longitudinal direction of the slab. The oscillating arm can move between two adjacent rollers of the transport driveway of the slab, about its oscillating axis parallel to its roller axis and thus parallel to the edge of the slab to be trimmed. When the head of the slab is led over the oscillating arm, it pivots in the direction of the front of the slab, causing the slab heads to be detached by the blades of the blade, which move nearly tangent to the lower surface of the slab. The slab then moves the slab aft until it is in the vertical line of the oscillating arm, and the oscillating arm pivots in another direction to release the slab aft burl by another blade of the blade. However, such a system needs to stop the movement of the slab and precisely settle it with the braking device prior to activation of the vibrating arm. In particular, for trimming the slab tail, it is necessary to advance the slab in front of the required position, then set the braking device in place and retract the slab against the braking device described above. The use of such a system therefore results in losses due to the necessary stopping of the slab for cutting of the grime and the retraction movement required to settle it.

In another device, a blade holder oriented parallel to the edge of the slab to be trimmed, for example as described in document FR-A-2,645,779 or US-A-5,253,398, has a plurality of blades oriented across the edge ( has a knife) After penetrating these blades into the burrs to the bottom surface of the slab, the blade holders move parallel to the edges described above, and each blade detaches the burrs with the same length as the movement of the blade holders. In contrast, in order to prevent the rise of the blade while penetrating into the pile, the use of a vertical braking means of the blade holder and a movable braking device applied on the slab top surface is necessary.

In general, these systems are both obstructive and require both complex mechanisms for the movement of the blades or brakes and the steering motors or jacks of these mechanisms. Thus, these devices cost money not only in investment but also in energy consumption. In addition, the slab must be stopped in order to proceed with trimming. These devices are generally installed before the reheating oven of the rolling mill because of this obstacle and their efficacy depends heavily on the temperature of the slab during trimming and their planarity which is highly variable before the melting process.

The present invention aims to solve these various problems, and particularly aims at ensuring effective trimming which can practically eliminate all the burrs. The invention also aims to nevertheless completely remove the burls without damaging the slab by the blade. It is another object of the present invention to provide a device which is simple in concept, low in disability and does not require steering or active means of consuming electrical energy. Another object of the present invention is to provide an apparatus which is inexpensive both in investment and in maintenance. Finally, it is an object of the present invention to reduce the number of trimming devices required in a production facility incorporating a continuous casting and stacking facility, and to prevent the transport of slabs by supplementary labor work between casting and stacking.

With this visible object, the invention aims at a trimming device comprising at least one trimming blade which extends across the direction of movement of the slab, said blade being fixed at a position in the above-mentioned direction of movement but in this direction. It moves horizontally and consists of:

Primary propulsion means of the blades towards the orbit of the slab;

A filler located upstream of the blade in the direction of movement and movable transversely in the direction of movement between the detection position where the filler is on the track of the slab and the retracted position where the filler is outside the track,

Secondary propulsion means acting on the pillar towards the detection position in the direction of movement,

Braking means connected to the filler, limiting the movement of the blade towards the track of the slab and having the blade outside the track of the slab in the retracted position of the filler.

The device according to the invention makes it possible, in particular, to detach the frontal burrs located on the rear end with respect to the direction of movement of the slab while it is moving, thus without fixing or standing. As can be well understood from the following, the device according to the invention uses the kinetic energy of the moving slab to remove the burrs when it reaches to come into contact with the blade held in the fixed position, and the trimming moves the slab as described above. Is done quickly.

Preferably, the device is located on the guide table of the slab on the side of the primary rolling mill cage of the hot rolling mill when it exits the reheat oven. The site makes available only the device for all slabs that have to be stacked on a heating train, and ensures fast trimming on the slab's regular trajectory between the reheat oven and the primary rolling mill, thereby ensuring independent Avoid further transportation of the slab, which is necessary to go through the trimming steps. In addition, trimming is done automatically, and therefore certainly before every stacking operation. Moreover, the high temperature of the slab from the reheat oven, typically between 1100 and 1250 ° C., facilitates the demolition of the burls, because at this temperature the binding of the slabs on the slab is relatively fragile and the energy required to dismantle the burls Because of the reduced mechanical requirements of the other elements of the device. This ensures significant continuous operation continuity and allows the device to be reduced in size, for example by installing them between two successive rollers of a roller table which are traditionally used to transport slabs from the oven to the primary rolling mill. . Moreover, the flatness of the slabs is better because they may not be bent in place, as they may be hot slabs stacked before being put into the oven.

The demolition of the gruel is only done when it comes out of the reheat oven, nevertheless the oven is contaminated by the possible fall of the gruel since only a small fraction of the gruel falls off while passing through the reheat oven with longitudinal beams. It will be noted that there is no risk.

Classically, the slab is in the same position as the blowtorch cut when trimming, so the burrs are located on the lower side.

As the slab passes over the trimming device, the pushing means of the filler keeps it applied against the bottom surface of the slab, and the weight of the slab is sufficient to prevent the filler from moving further upwards. The filler is thus defined as the upper bus bar of the rollers of the roller table and is at approximately the same height as the plane constituting the roller plane of the slab. In this position, due to the braking means, the filler retracts the blade to a position that disappears below the plane, prevents the blade from contacting the lower surface of the slab and prevents the blade from marking the surface during the movement of the slab. Avoid.

At this time, as a result of the movement of the slab, its rear face passes past the filler, so that it is no longer restrained by the weight of the slab, and the pushing means of the filler causes the filler to rise again above the roller height of the roller table, At the same time, the braking means connected thereto is interlocked. The blade is no longer fixed by the braking means and is pushed upward by the pushing means, which is moved until it comes in contact with the lower surface of the slab. The distance between the filler and the blade edge of the blade is determined to be a predetermined distance from the rear face such that the blade reaches in contact with the slab with the grime at this moment. The aforementioned distance is determined to allow the blade to capture all the grits, for example typically 10 cm, which is usually sufficient to remove all grits of all types, affecting only the small length of the slab So that he avoids all of the risks of making a greater length on his underside.

As the slab continues its movement, the burrs are restrained by the blade and automatically detach from the slab, at which point the ends of the slab reach the blade front of the blade.

Preferably, the device comprises a number of parallel blades raised across the direction of movement of the slab, each blade having its own propulsion device. All the blades so arranged side by side in the width direction of the slab can be perfectly matched across the bottom face of the slab and its entire width, and in contrast to any drawback of the slab planarity, each blade has its own propulsion means. Under the influence, the height of the zone of the slab, located just above each slab, works in the correct position and rises as much or as little.

According to the special device:

The pillars are supported by supports pivoting around a primary axis perpendicular to the direction of movement,

Each blade is fixed on a blade holder arm that pivots about a secondary axis perpendicular to the direction of movement.

Preferably, the two pivot axes are intermingled, and the filler support and the blade holder arms are installed in abutment about the same axis located downstream of the filler and the blade in the direction of travel of the slab.

Upward propulsion of the pillars can be obtained simply by counterweights fixed to the ends of the pillar supports opposite the pillars with respect to their pivot axis.

Equally, the propulsion of the blade or each blade towards the slab is simply by another counterweight fixed to one end of the blade holder arm opposite the blade about their pivot, or for example a blade holder. It can simply be obtained by a spring system arranged under the arm, which can also be involved in pushing the filler to the moment the rear face of the slab exceeds the filler relative to the lower surface of the slab.

The filler support is preferably formed of two filler arms, each arranged laterally on each side of the device, between which the blade (s) are located. Furthermore, also preferably, the filler is a roller which is freely installed between the ends of the filler arms described above, the axis of which extends perpendicular to the direction of movement of the slab. And, while the slab is moving at the top of the device, the aforementioned rollers come into contact with the lower surface of the slab and roll without deterioration of the surface thereof.

These various arrangements simplify the construction of the device and reduce the annoyance. In addition, as the filler arm is laterally positioned outwardly in front of the blade, the space located in front of the blade (s) is free and the webs can fall freely under the roller table without disturbing the operation of the device.

In order to prevent the filler from moving excessively and crashing into the track of the slab when there is no slab on the top of the device, the filler can be automatically re-propelled by the front end of the slab which only slightly invades the slab track and reaches over the device. A brake can be in place to limit the movement of the filler. However, in order to prevent the impact of the slab on the filler and the deterioration that may be caused by the repetition of such impact, the device preferably comprises retirement means for moving the filler away from the orbit towards the retracted position. The retirement means consist of, for example, a jack acting on a lever associated with a filler support and to a sufficient distance below the slab driveway in order to ensure that the filler is completely and consequently the blade does not hit the filler upon arrival of the slab. Let them be defeated As soon as the front end of the slab crosses the filler, the aforementioned retirement means can loosen, and the filler again carefully contacts the lower surface of the slab under the effect of the propulsion means.

The detection of the rear end of the slab and the manipulation of the blade movement are entirely mechanical, and at the beginning of trimming the position of the blade relative to the front of the slab is determined only by the geometry of the system, in particular only by the distance between the filler and the blade blades. Therefore, the detection accuracy of the position of the surface to be trimmed is assured and there can be no deviation or disturbance which has been caused by the position detecting means separated from the trimming tool.

Another advantage is that the relative speed of the slab relative to the blade during trimming is relatively low, since it is equal to the speed of the slab that can be delayed while passing over the trimming device, which may degrade the blade of the slab. Ensures smooth trimming without shock.

Among other advantages, the operational simplicity of the mechanism that ensures reliability is noted, and furthermore all malfunctions can be detected quickly, which is especially true for the localization of the device on the regular course of the preceding slab before the primary rolling mill. ) Makes it easy to visualize and access it by the mill supervisor, the configuration is mechanical and the cost is small compared to the device according to the prior art.

Further features and advantages will be apparent from the description to be made as an example of a trimming device of the slab which is more particularly used for trimming of the rear end, more particularly in accordance with the present invention, more specifically the tail of the slab.

The accompanying drawings are as follows:

1 to 3 show an embodiment of the preferred device implementation of the device in three successive atmospheres, the passing of slabs over the device and the trimming step,

4 presents one implementation variant comprising the means for eviction of the device in the standby position,

5 is a view from below of the device;

Gross-removal device 1 is installed between two successive rollers of a roller table which are used classically to ensure the transport of slab between the reheating oven of the hot rolling mill and the primary rolling mill, the slab 3 being indicated by an arrow ( Move in the direction of F1).

The trimming device comprises a filler consisting of rollers 4, which rollers are mounted freely on the pillars which extend over the entire width of the roller table and are supported at the ends of the two arms 5 connected by the spindle 6. have. The shaft 6 is pivoted on the bearing 7 of the fixed chassis. The arm bears or includes an extension extending opposite to the filler 4 with respect to the axis 6, both of which likewise have a tendency to pivot the filler arm in the upward direction of the filler roller 4. For example, one fixed braking device 9 located below the counterweight is prepared and the turning is limited in one position, as shown in FIG. 1, where the filler is directed to the upper bus bar of the roller 2. It is slightly above the defined roller plane P.

Between the two pillar arms 5 a number of blade holder arms mounted on the spindle 6 and pivoting are provided. Each blade holder arm 10 extends almost horizontally and has trimming blades at their ends located towards the filler 4, with the safety blade 12 guided towards the filler extending transverse to the direction of movement of the slab 3. The distance between the safety blade 12 and the filler 4 described above is, for example, approximately 10 cm. The blade holder arm also includes an extension 19, which consists of a flat weight which extends to the opposite side of the blade and aims to pivot the blade holder arm up.

To the distal end bearing the blade 11, the blade holder arm 10 comprises a latch portion 13 extending downward and curved towards the shaft 6, which is the upper surface 14 of the latch and the blade holder arm. A groove is established between the lower surfaces 15 of the rods, and passes through a bar 17 extending in parallel with the main shaft 6 in the groove and fixed at its end on the arm of the filler 5. The latch 17 thus constitutes a braking device for the latch 13 of the blade holder arm and thus restricts the blade 11 from turning upward.

In addition to the counterweight 19, each blade 11 is pushed up by a spring jack system 20 located on the end of the blade holder arm.

The operation of the trimming device of the slab tail will now be described with reference to FIGS.

In the standby position represented in FIG. 1, the counterweights 8, 19 and the spring system 20 propel the filler 4 and the blade 11 upwards, the movement of the filler being restricted by the braking device 9 and The movement of the blade is limited by the latch brake 13 under the latch 17. In this position, the filler passes over the roller plane P of the slab.

When the slab 3 arrives at the device region, its front end approaches the filler subsided by the slab weight and takes the blade holder arm with it to the position represented in FIG. 2, with the blade 11 below the plane P. As a result, the lower surface 31 of the slab disappears to a distance sufficient to avoid the risk of touching it. While holding the device in this position, the slab continues its movement, and the filler roller 4 holds the lower surface 31 described above.

When the trailing end 32 of the slab with the burr 33 to be removed passes the filler 4, it is pushed upwards by the pivoting of the arm 5 which is linked to the counterweight 8, the counterweight being braked. (9) to be supported. In doing so, the braking bar 17 is also mounted and the blade holder arm is brought into contact with the lower surface 31 of the slab, as shown in FIG. 3, under the influence of the counterweight 19 and the spring 20. Until you get a turn. It can be readily seen that when the slab continues to move, the burr 33 begins to contact the safety blade 12 of the blade. In order to prevent immediate reraising of the blades after trimming, a small roller 18 is installed after the blades 11 on each blade holder arm, which is leveled to about the same height.

In the figure of FIG. 4, one variant embodiment is presented which can prevent the impact of the slab on the filler roller 4 when the head of the slab arrives in the region of the device. According to this variant, the device comprises eviction means which allow the filler to be sufficiently lowered below the plane P, in particular the slab head 34 and any of the burrs 35 and filler thereon. This is to prevent contact. The retirement means consist of, for example, a jack 22 acting on a lever 23 which is rotatably connected mounted on one end of the main shaft 6. In the standby position, the jack 22 holds the device in the exit position shown in FIG. 4, and once the head of the slab passes the filler roller 4, the force of the jack is loosened, which causes the device to be shown in FIG. 2. To return.

Note that the possibility of having each blade holder arm pivoting independently of the others about the main axis 6 makes it suitable for automatically positioning the blade in the form of a slab's geometry. In other words, if there are more blades that can pivot independently of each other, the device can be better adapted to the concave or convex shape of the lower surface of the slab, thus allowing optimal trimming of the entire width of the slab. For example, four blades and blade holder arms mounted on the same axis make a very good compromise between the considerable complexity and satisfactory effect of the device for an overall width of approximately 1900 mm.

The invention is not limited to the implementation mode described above by way of example only. The construction techniques may be changed without departing from the scope of the present invention. In particular, the pivot axes of the support of the filler and the blade holder arms may be parallel as well as unmixed. The pillars, blades, or pillars and blades may also be installed on supports which are guided in parallel motion almost vertically instead of on the pivoting supports or arms.

The apparatus described above is especially for trimming the tail of the slab that is in progress during the direct movement from the reheat oven to the starch rolling mill. A similar device can also be used to detach the burls of the slab head, ie to remove the burls formed on the front end of the slab under consideration in the direction of movement towards the primary rolling mill, by placing the device in the reverse direction and the head of the slab By tolerating the retreat to the tail of the slab after allowing it to pass up. However, this practice decouples the two ends of the slab and thus disadvantages not only in area but also in durability. Preferably, another device specially suited for trimming the head of the slab is used, for example those described in the French patent application filed simultaneously with this in the name of the applicant of the present application, see here. In this case, the leading trimming device and the trailing trimming device will be installed close enough to each other on the transport path of the slab so that the trailing edge is close to the trailing trimming device at the speed deceleration caused by the leading trimming. This assumes that the leading trimming device is behind the rear trimming device in the slab advancing direction toward the ablation mill, so that the two operations are developed almost simultaneously.

Claims (11)

In the trimming device of a slab comprising at least one blade 11 extending transversely to the direction of movement F1 of the slab 3, the above-described blade 11 is fixed in the above-described direction of movement, but in this direction. Is transversal to Primary propulsion devices (19, 20) for moving the blades towards the orbit of the slab, A filler 4 located upstream of the blade 11 in the direction of movement and movable transversely in the direction of movement between the detection position where the filler is on the track of the slab and the retracted position where the filler is outside the track, Secondary propulsion means 8 acting on the pillar towards the detection position in the direction of movement, and A braking means (17) connected to the pillar and restricting the movement of the blade toward the track of the slab and having the blade outside the track of the slab in the retracted position of the filler. The trimming device according to claim 1, wherein the filler (4) is supported by a support (5) that pivots about a primary axis perpendicular to the direction of movement. Trimming device according to claim 1 or 2, characterized in that the blade (11) is supported by a blade holder (10) that pivots about a secondary axis perpendicular to the direction of movement. 4. A trimming device according to claim 2 or 3, wherein the primary and secondary axes mentioned above are intermingled. The trimming device according to claim 2, characterized in that the aforementioned filler propulsion means comprise counterweights (8) fixed at the ends of the filler support (5) opposite the fillers (4) with respect to the primary axis. . 4. The blade propeller as described in claim 3, characterized in that it comprises a counterweight (19) fixed at the distal end of the blade holder arm (10) opposite the blade (11) with respect to the secondary axis. Trimming device. 4. The trimming device according to claim 3, wherein the aforementioned blade propulsion means comprise a spring (20). 4. The trimming according to claim 2, wherein the braking means comprises a latch 17 associated with the filler support 5 and interoperates with the brake 13 associated with the blade holder 10. Device. 3. The trimming according to claim 2, wherein the support of the filler is formed from two pillar arms 5 arranged laterally and the filler is a roller 4 freely mounted between the ends of the filler arms described above. 4. Device. The trimming device according to claim 1, comprising a plurality of blades (11) parallel to and transverse to the direction of movement. A trimming device according to claim 1, comprising a retirement device (22, 23) for moving the filler (4) farther away from the orbit of the slab towards the retracted position.