FR2698162A1 - Device for ensuring the lateral introduction of steel products into an oven. - Google Patents

Abstract

Device intended to ensure the lateral introduction of steel products, such as in particular billets, directly into the heating zone of a furnace, in particular of a reheating furnace, to which said steel products are brought by a handling means of the type known, this device being characterized in that it comprises a chute (14) on which the product (10) is deposited by the handling means, before lateral introduction into the oven, this chute serving as a support for said product when introduction into the oven and being provided for this purpose with displacement means (40-46) to ensure its insertion at the same time as the product that it supports, means (48) being furthermore provided to ensure the removal of said produced in the oven from said chute.

Description

1 - The present invention relates to a device intended to ensure

  the introduction of steel products such as, in particular, billets or the like into kilns

heat treatment.

  In general, the introduction of steel products into heat treatment chambers and in particular into reheating ovens is carried out, at the inlet of the furnace, either frontally or laterally, using for example roller tables or various

mechanisms designed for this purpose.

  In certain applications, and in particular in the case of loading hot products from a continuous casting line, it may be advantageous to put the products directly into the heating zone of the oven, after the recovery zone. load the products laterally in the area of the oven whose temperature corresponds to that of the products to be treated. There are already known devices ensuring a lateral charging of the products in an oven. Such known devices, located in the current part of the oven can be produced either in the form of a clamp suspended under an overhanging arm and carrying the produced inside the oven, either in the form of

  thrust which cause the product to rip inside the oven.

  These known devices have the disadvantage of being heavy and expensive and furthermore of being limited in their application to the charging of short products, in particular for safety reasons. Indeed, in systems of the clamp type suspended under a cantilever arm, this cantilever is necessarily limited, and in systems employing shifting thrust devices, products having significant deformations may undergo trajectory drifts when they are introduced into the oven, which of course affects the accuracy of their positioning in this oven Furthermore, the passage of the fingers of the tongs of the charging device or the deformation of the product to be placed requires considerable distances between the products introduced into the oven, which limits the load of the latter and increases its length. The present invention therefore proposes to provide a device which does not have the disadvantages of

  prior art devices mentioned above

  above and allowing the lateral introduction into the main part of an oven of very long steel products or having significant deformations while offering the possibility of depositing them in a precise location of the oven on the supports provided for the products inside of the oven Furthermore, the invention makes it possible to produce simple, inexpensive equipment of reduced size in

  look at the weight of the products to put in the oven.

  Consequently, the present invention relates to a device intended for ensuring the lateral introduction of steel products, such as in particular billets, directly into the heating zone of an oven, in particular of a reheating oven, to which said steel products are brought by a known type of handling means, this device being characterized in that it comprises a chute on which the product is deposited by the handling means, before the lateral introduction into the oven, this chute serving to support said product during introduction into the oven and being provided for this purpose with displacement means to ensure its charging at the same time as the product which it supports, means being further provided for ensuring the deposit of said product in the

oven, from said chute.

  According to the present invention, the cross section of the chute has a shape which is chosen so that it has a face serving as a support for the product, 3 - said support face constituting a reference of

  positioning when depositing said product in the oven.

  According to the invention, means are provided for cooling said chute, for example by circulation of a cooling fluid, in particular water, the chute then being able to include chambers or

  circulation channels for the coolant.

  According to the invention, means are provided for guiding the chute during its movements outside the oven, then through the lateral opening of the latter, provided for charging and also inside the

  oven, on the side members or on the bottom of the latter.

  The guide means outside the oven can be produced in the form of rollers provided with shoulders,

  on which the chute circulates before it is placed in the oven.

  The guide means through the lateral charging opening can be made in the form

  guide rails positioned in said opening.

  In the case of an oven with refractory beams, the guide of the chute inside the oven can be obtained by grooves made in the fixed hearth and by centering slides, optionally cooled, positioned at the junction between the elements fixed sole

and the mobile oven rails.

  In the case where the furnace is of the type with tubular beams, the guide of the chute inside the furnace is ensured by slides which are welded to the beams. According to a preferred embodiment of the invention, the displacement of the chute according to an alternative longitudinal translation movement can be ensured by a pinion-rack system or by a cable winch mechanism.

  drive on which said chute is coupled.

  According to the invention, there is provided a movable stopper through the lateral charging opening, the installation in the chute, when moving it allows to deposit the product on the sole or on the rails

from the oven.

  According to a preferred embodiment of this invention, the movable stop can be controlled by a jack, pneumatic or hydraulic, or it can be of the gravity return type. Its position is preferably variable in order to allow the steel product to be positioned in

  the oven for example depending on its length.

  Other features and advantages of this

  invention will emerge from the description given below in

  reference to the accompanying drawings which illustrate various embodiments thereof, devoid of any limiting character In the drawings: FIG. 1 is a diagrammatic view in section through a vertical plane showing the position of the chute during loading by a billet and before being introduction to

  through the side opening of the oven.

  FIGS. 2 a and 2 b are cross-section views of two exemplary embodiments of chutes and their guide means before their lateral introduction into the oven; FIG. 3 is a schematic perspective view illustrating an exemplary embodiment of a means for guiding the chute through the lateral opening of the furnace; FIG. 4 is a schematic perspective view showing an exemplary embodiment of the means of guiding the chute in an oven with refractory beams; Figure 5 is a schematic perspective view showing an embodiment of the guide means

  of the chute in an oven with tubular beams.

  Figure 6 is a schematic plan view showing the entire device according to the present invention and; Figures 7 a, 7 b and 7 c are side elevational views illustrating a lateral loading operation in - an oven of a steel product of great length by the

device object of the invention.

  Referring firstly to Figure 1 which is a sectional view through a vertical plane representing in particular the chute of the device according to the invention, outside the oven, before loading the product to be introduced laterally into the oven, product being shown here in the form of a steel billet 10 whose section may be small compared to its length, and whose deformation may be significant In known manner, the supply of the billet can be ensured by any system of known handling

  for example by a roller table 12.

  According to the invention, the charging device comprises a chute designated as a whole by the reference 14 This chute has a cross section whose shape is determined so that it serves to support the

  product 10 when handled for charging.

  In the embodiment illustrated in FIG. 1, the chute 14 has a bearing face 14 'which constitutes the positioning reference for depositing the product in the oven. As can be understood, this trough 14 of regular section serves as a support for the steel product 10 during

  its introduction into the oven as will be described below

  after This chute is therefore provided with displacement means, which will be described below and its rigidity as well as its precise dimensions make it possible to ensure its precise guidance both outside and inside the oven in order to guarantee the accuracy product positioning 10

  regardless of its shape or deformation.

  According to the invention, the chute 14 can be cooled by a circulation of a cooling fluid, for example water. In the embodiment illustrated in FIG. 1, the chute has internal chambers or channels 16 and 16 '' ensuring the circulation of the coolant. 6 - The billet 10, correctly positioned is pushed into the chute 14, from the roller table 12, for example using a pusher 18 or any other known means which deposits it in the chute. When traveling, it is necessary to ensure

  guiding the chute carrying the steel product / 0.

  Guidance means are therefore provided outside the oven, in the lateral charging opening and at

inside the oven.

  Figures 2 a and 2 b show two embodiments of the means provided by the invention for guiding the chute 14 outside the oven In the embodiment illustrated in Figure 2 a, guiding the chute is obtained using rollers 20 provided with lateral shoulders 22, 22 'and, in the embodiment illustrated in Figure 2b, the guide of the chute moving on rollers such that 20' is

  obtained using lateral rollers 24, 24 '.

  In Figure 3, there is shown an embodiment of the means provided by the invention for guiding the chute 14 during its passage through

  the charging opening provided in the wall P of the oven.

  In this exemplary embodiment, this guidance is obtained using parts in the form of slides such as 26 which are positioned in the wall P as seen on this

figure 3.

  FIG. 4 schematically represents the hearth of a furnace with refractory beams This hearth comprises, in known manner, fixed elements such as 28, 28 ′ between which movable beams are interposed 30 Guiding the chute 14 in such an furnace with refractory beams is ensured on the one hand by means of a groove such as 32 formed in the element 28 of the fixed hearth and on the other hand, by centering pieces or slides such as 34 which are embedded in the elements 28 'of the fixed sole, at the

  junction between the moving beams 30 and these elements 28 '.

  7 - Such centering pieces 34 can possibly

  include cooling means.

  In FIG. 5, the case of a furnace with tubular beams 36 has been illustrated. In such an application, the guide of the chute 14 inside the furnace is ensured by means of slides of suitable shape such as 38, 38 '

  which are welded to the side rails 36.

  As specified above, the chute 14 includes means which ensure its movement in order to

  the charging of the steel product 10 which it supports.

  This displacement can be obtained using any system

  classic, for example using a pinion mechanism-

  rack driven by an electric or hydraulic motor, by a hydraulic or pneumatic cylinder or, as shown in FIG. 6 by way of nonlimiting example of embodiment, by a winch system 40 controlled by an electric geared motor group 42, and driving a cable 44 on which is mounted a connecting piece 46 coupled to the chute 14 Such a system makes it possible to drive the chute 14 according to an alternative longitudinal translational movement to bring the product 10 inside the furnace F as well as will be described below In this Figure 6, there is also shown the furnace F which, in this embodiment, is an oven with refractory beams which comprises the means for guiding the chute 14 as described above in

reference to Figures 3 and 4.

  For the description of the operation of the device

  object of the invention, reference is now made to FIGS. 7 a

to 7 tsp.

  The chute 14 carrying the product 10 enters the oven F, through the charging opening formed in the wall P of the latter. This movement of the chute 14 is ensured by the drive device, described above in reference to FIG. 6 and, during this movement outside the oven, the chute 14 carrying the product 10 is guided here by lateral guide rollers 24, 24 'of type 8 -

  described above, with reference to Figure 2b.

  The chute 14 carrying the billet 10 is guided during its passage through the lateral opening of the oven, then into the oven, after its lateral introduction, by the guide means described above with reference to the figures

3 to 5.

  According to the invention, means are provided which make it possible to deposit the steel product such as 10 on the hearth S of the furnace or on the side members which the latter comprises. In the embodiment illustrated by FIGS. 7 a to 7 c, these means are made in the form of a movable stop 48 which can be positioned in the chute 14 as will be seen below. This movable stop can be actuated by any conventional means, for example by a jack such as 50, pneumatic or hydraulic, as shown in FIGS. 7 a to 7 c, or else it can be gravity-return. Its position can be variable in order to allow positioning of the product such as 10 depending

  the length of the latter in the oven.

  When introducing the chute 14 carrying the steel product 10, the stop 14 is in the high position

as shown in Figure 7 a.

  After positioning in the furnace F (FIG. 7 b) of the chute 14 carrying the product 10, the movable stop 48 is brought to the low position so that it is positioned in the chute as seen in the figure. When the stop is in place, the means for moving the chute 14 are actuated so as to bring this chute back outside the oven as shown in FIG. 7 c During this backward movement of the chute 14, the product 10 is retained by the stop 48 in the low position and it is then gradually deposited on the sole S (or on the side members of

  the latter) in a specific position.

  After complete retraction of the chute 14, that is to say when it returns to its starting position as shown in FIG. 6, the chute is in position 9 - waiting before receiving a new product 10 and the movable stopper 48 is brought back to the high position. The beams of the furnace can therefore freely execute their advance cycle. The movement of these beams is carried out in a conventional manner, the lifting stroke being simply increased in order to take account of the level more low charging

  product resulting from the device which is the subject of the invention.

  Among the technical advantages and effect provided by the invention, there may be mentioned in particular: the possibility of laterally placing steel products at any point along the length of an oven, which makes it possible to optimize the operation of this oven, as a function of the temperature of the products to be placed in the oven, the application of the device to all types of ovens and of products to be treated therein, in particular products of great length and of small section opposite this length; the deformation of the products to be placed in the oven does not affect the quality of the oven placement and the accuracy of depositing the product on the supports provided on the hearth of the oven; all of the equipment to be used to make the device that is the subject of the invention is particularly simple, of reduced weight and using proven technologies, which makes it possible to obtain a low cost price; a possibility of easily automating the operation of the device by the installation of sensors and limit switch systems, corresponding to each elementary movement of the chute; possibility of slaving the operation of the device to the rate of arrival of steel products on the furnace supply system, to ensure their regular charging; the device does not require a significant increase in the distance separating the products in the oven and therefore, it does not penalize either its load per m 2, nor its useful length. It remains to be understood that the present invention is not limited to the embodiments described and / or

  represented but that it encompasses all variants.

he -

Claims (12)

  1 Device intended to ensure the lateral introduction of steel products, such as in particular billets, directly into the heating zone of an oven, in particular of a reheating oven, to which said steel products are brought by means of handling handling known type, this device being characterized in that it comprises a chute (14) on which the product (10) is deposited by the handling means, before lateral introduction into the oven, this chute serving to support said product during of the introduction into the oven and being provided for this purpose with displacement means (40-46) to ensure its charging at the same time as the product which it supports, means (48) being furthermore provided for ensuring the removal of said   produced in the oven from said chute.   2 Device according to claim 1 characterized in that the cross section of the chute (14) has a shape which is chosen so that it comprises a face (14 ') serving as a support for the product, said support face (14 ') constituting a positioning reference   when depositing said product in the oven.   3 Device according to any one of   previous claims characterized in that   provides means for cooling said chute.   4 Device according to claim 3 characterized in that said cooling means consist of a circulation of a cooling fluid, in particular water, through chambers or channels (16,16 ') formed in said chute 14.   Device according to any one of   previous claims characterized in that provision is made   means for guiding the chute during its movements outside the oven, then through the lateral opening of the latter provided for charging and also inside the oven, on the floor or the side members 12 - of the latter.   6 Device according to claim 5 characterized in that the means for guiding the chute (14) outside the oven (F) are produced in the form of rollers (20) provided with shoulders (22, 22 '), on which ones   circulates the chute before it is placed in the oven.   7 Device according to claim 5 characterized in that the means for guiding the chute (14) through the lateral opening of the oven are produced in the form of guide rails (26) positioned in said opening.   8 Device according to claim 5 applied to an oven with refractory beams, characterized in that the guide of the chute (14) inside the oven is obtained by grooves (32) formed in the fixed hearth (28,28 ' ) and by centering slides (34), possibly cooled, positioned at the junction between the elements of   the fixed hearth and the mobile longitudinal members (30) of the oven.   9 Device according to claim 5 applied to an oven of the type with tubular beams characterized in that the guide of the chute (14) inside the oven is ensured by slides (38-38 ') which are welded to the tubular beams (36).   10 Device according to any one of   previous claims characterized in that the   displacement of the chute (14) according to an alternative longitudinal translation movement is ensured by a rack and pinion system.   Device according to any one of   claims 1 to 10 characterized in that the displacement   the chute (14) in an alternative longitudinal translational movement is provided by a winch mechanism (40) with a drive cable (44) on which is harnessed said chute.   12 Device according to any one of   previous claims characterized in that provision is made   -13 - a movable stop (48) through the lateral charging opening, the installation in the chute (14), during the displacement thereof allows the product (10) to be deposited on the floor ( S) from the oven. 13 Device according to claim 12 characterized in that said movable stop (48) is controlled by a pneumatic or hydraulic cylinder (50) or is of the gravity return type.   14 Device according to one of claims 12 or   13 characterized in that the position of said stop is variable in order to position the product (10) in the oven   for example depending on its length.