FR2628663A1 - DEVICE FOR DECREASING THE SURFACE OF MOLTEN METALS - Google Patents

Abstract

Device for scouring the surface of molten metals, characterized in that a double-shaped frame 6, formed as a polygon, parallel to a pig casting strip 1 and mounted on the latter, carries a chain conveyor 8 whose chain wheels 7 are fixed on the peak points of the polygon of the sides of the frame 6, the chain conveyor 8 being co-driven at synchronous speed by the drive of the pig casting belt 1, and the slagging blades 11 of the Scraping modules 10 guided above the shells 2 being guided in height so that they dip very slightly into the molten metal. The invention relates to a device for cleaning the surface of molten metals.

Description

Device for slagging the surface of molten metals "

  The invention relates to a device for de-

  smearing the surface of molten metals in the shells of castings of pigs.

  Pigs or bars-of different kinds

  rates are often sunk on so-called

sword casting tapes.

  It is necessary to eliminate the layer of

  dirt forming on the molten metal in the co-

  individual pins before the metal solidifies

  trust. Devices are known that remove such layers of dirt from metal surfaces

with scraping elements.

  Thus, in the document SU-C 455 804, there is described a device in which scraper blades of the width of a shell, in the shape of a spatula, circulate perpendicularly to the direction of movement of a sword casting strip, by means of a

  chain transmission, from a sharp point of view

  port on the surface of the liquid metal, in a frame

  box shape, located above the cou-

  lane of pigs, scraping off the layer of dirt and

  ejecting into a tank located on the frame the quantity

  dirt on the scraping blades,

  when returning over the frame, at the point of deviation

  tion. The box-shaped frame is fixed to guide elements arranged parallel to its direction of movement, on both sides of the pig casting belt, and allowing the box-like frame to be co-driven on the casting strip. of

  pigs, by sliding on it, for a short time.

  jet. This solution does not allow a

  bonding and promotes parts by projection of metal. Use in fast pigs and variable speed devices is not possible as walking

  synchronous operation which is necessary for the

  wise with the sword casting tape for the duration of the scrubbing of a shell can not be established for a sufficient value. In addition, the problem of evacuating the amount of dirt accumulated in

the tank is not solved.

  Another device is shown in the document DD-C 211 728, for which a movable scraper blade is pulled over the entire surface of the liquid metal so that the latter is isolated at the end of the shell, with a fixed scraper blade and that the

  grime can be grabbed and raised between the two.

  This uplift is caused by a system of artificial arms

  ticulate and cylinder. On this occasion the system,

  dragged by jacks, moves parallel to the axis of the sword casting belt, until

  the process of cleaning a shell is

  born, and it returns to the initial point after ejection of dirt, so the next shell to be cleaned. Synchronous operation between the scraping device and

  each shell is interrupted by phases of

  These are expensive, space-controlled, during which metal entrainment and projection occur due to the high acceleration movement processes, because the scrapers leave the working point in the meantime. The device is also an expensive construction so prone to failures; the scrubbing phase of a shell is relatively long, since only one blade per shell is drawn over the entire length of

the surface of the liquid metal.

  The purpose of the invention is to achieve a

  cautious, but very fast, crushing

  its molten metals found in pig casting shells, which work in a continuous casting plant at speeds

high and variable.

  The object of the invention is to create a device

  smelting of the surface of molten metals

  in shells of gussa casting bands,

  annealing, for continuous casting at high speeds

  Varies and variables, synchronous operation for the duration of the scrubbing, between each shell to be cleaned and the scraping elements; who works by asking for little time for the scraping process, being

  little subject to breakdowns; avoids training or

  jection of molten metal; excludes the taking of

  scraping in the metal solidifies in the event of faults on the installation and provides transport

  simple and appropriate evacuation of dirt to be disposed of

shells.

  This problem is solved according to the invention,

  in that a double-sided frame, formed in poly-

  gone to more than four sides is arranged, parallel to

  a pig casting belt and mounted thereon.

  The spacing of the two faces of the frame is at least the width of the shells of the casting strip of

  pigs. The sides of the frame faces formed in poly-

  are also referred to below as sec-

working conditions of the polygon.

  The frame carries a chain conveyor whose chain wheels are attached to the corners called

  vertex points of the polygon of the sides of the frame. A number

  number of rotating joints is arranged on

  chains of the chain conveyor, between the chains

  and equidistant, joints on which

  scraping modules are mounted by hanging on

  brement, through hinge bolts

and fasteners.

  The chain conveyor is co-driven by the training of the pig casting belt. It thus moves constantly at synchronous speed with the sword casting belt. A working side or section of the polygon has the same slope angle as the seam band. The chain conveyor is arranged in height, above the band

  cast of pigs, so that the modules of

  clage, with their scraping blades, being in the polygonal circulation plunge very weakly

  in the molten metal in the shells,

  pushing the layer of dirt lying on the

  molten metal. The working section following the sec-

  of work developing under the same angle as

  - the sword casting belt has an angle of

  a larger value, between 13 and ', than the previous slope angle. The scraping modules are thus raised gently and gradually from the surface of the metal in the shells. A horizontal fixed hinge point to which the frame is pivotally attached is on the front, vertical side of the polygonal frame, in the direction of movement of the

  sword casting tape. A joint, on the-

  which the piston rod of a lifting element is articulated, is fixed on the also vertical frame side of the polygon, opposite to the frame side of the hinge fixed point. If necessary, the entire frame can be tilted around the point of articulation, upwards, using this articulation of

  lifting. The lifting stroke has on this occasion a

  they are always more important than the depth of

  mersion of scraping blades of scraping modules

  in the dirt and molten metal in shellfish

  the. The polygonal layout of the chain conveyor chain wheels, arranged in the frame, forms

  a free space in which a transport is

  dirt, endless type, perpendicular to the

  sword casting tape, made in the form of

  in which the scraper modules move, the working section of the polygon being arranged horizontally above the transport conveyor.

dirt.

  Rotating joints are fixed on

  chains of the chain conveyor, at distances

  each time reciprocally opposed, articulated

  on which are mounted modules of

  free hanging, by means of bolts of

  by means of fasteners,

  between each time two opposite rotating elements.

  That is why, because of the gravity, they always orient themselves vertically, independently of the different

  slope angles of the chain transporter polygon.

  Two working cylinders and, in the

  along their longitudinal axes, two guide columns are arranged in the casings of the modules

  scraped horizontally next to each other

  very, and each time arriving at the middle of the casing, with a sense of opposite work. The columns

  are used to maintain sliding

  connected to the piston rods of the cylinders.

  Fasteners are fixed on the sliding parts, emerging downwards on the housing and folded inwards, which, in the state in which they touch, therefore at the end of the scraping process of each shell of casting tape

  pigs, form a wedge-shaped space to receive

  see the amount of scraped dirt. The width of the

  my scraping is the width of the shells.

  A controllable group of valve valves, an endless working signal transmission system, and a contact module.

  energy transmission for compressed air and

  electric power supply are also housed in each

one of the scraping modules.

  Power supply for energy

  Rins is effected by a rotary distributor of compressed air arranged on the frame, approximately in the center of the circulation of the scraping modules. Order transmitters are located in defined positions of the frame, for the transmission of the signals intended for the control of the valves of distributors

  placed in the scraping modules.

  An important feature of the invention

  tion is the polygonal circulation of the modules

  scraping in the working sections with defined slopes

  the scraper working section, for which the slope of the chain conveyor corresponds

  at the slope of the swath of the pigs; the sec-

  the lifting work of scraping modules with a sloping slope.

  casting pigs; the working section o

  perform the work of uprising, for which is

262866E

  realized the change of direction of the conveyor chain circulation - the working section of the dirt ejection on the dirt conveyor, for which the movement of the chain conveyor takes place horizontally; and the working section

  from lowering to work level and from immers-

  scraping blades in the molten metal in

  the shells, according to a synchronous step with the ban-

of pig casting.

  With the aid of the solution according to the invention,

  it is possible to perform a cautious scraping and

  and eliminates molten metal scum which is in the shells of up-and-down skeet casting belts, even in continuous operation and at high and variable sword casting speeds. By means of the device, an exactly synchronous step is guaranteed for the duration of scraping of the dirt of the metal surface,

  between the shell to be cleaned and the elements of

  cling. Any training or projection of the metal into

  sion is largely avoided. Taking the elements of

  In the event of faults in the casting installation, clage in the solidifying metal is excluded. Transportation

  evacuation of the scraped dirt quantities of co-

  bowling takes place in a simple and very

  in this case. The device works without failure. Her

  configuration is relatively inexpensive, its manufacturer

cation is simple.

  Various other characteristics and advantages

  of the device of the invention.

  detailed description which follows. An embodiment of

  the invention is shown by way of nonlimited example

  FIG. 1 shows a schematic side view of the device; FIG. 2 is a view of a scraping module;

  FIG. 3 is the view from above of a module of

  4 is a section A-A according to FIG. 1; FIG. 5 is a representation of the working areas of the scraping modules in the polygon;

  FIG. 6 is a longitudinal section of the device

  tif, without the double-sided frames.

  A double-sided frame 6 is formed of poly-

  gone irregularly, presenting in this example nine sides, and is arranged with its sides parallel to

  a band of piglets 1 and above that

  the latter. The interval of the faces of the frame 6 is a little wider than the width of the shells 2 of the band

  1. The individual sides of the

  these polygon shapes are also referred to in the other embodiments as the working sections. The frame 6 carries a chain conveyor 8 whose chain wheels 7 are fixed on the corners

  faces of the frame 6, designated as the dark points

put the polygon.

  Seven scraping modules 10 are mounted, in

  freely, between the chains 20 of the transpor-

  chain 8, with the same spacing, through the

  joint of 21 rotating joints, bolts

  hinge 9 and fastening elements 23.

  The chain conveyor 8 is driven by the drive 5 of the pig casting belt 1, thus constantly moving at synchronous speed

  with this one. A working section of the polygon

  sede the same slope angle as the casting strip of

pigs, 7 'in the present case.

  In this working section, with an angle of slope identical to that of the pig casting belt 1 and the chain conveyor 8, the height interval of the chain conveyor 8 above the pig casting belt 1 is of such value

  scraping modules 10 being in circulation.

  In this case, the polygonal section plunges very weakly with their scraping blades 11 into the molten metal 3 into the shells 2. The module following this working section has a slope angle of 20 ',

  that the scraper modules 10 are gradually

  lifting of metal surfaces in shells 2.

  The polygonal trace of the chain conveyor 8 forms a free space 15, in which there is an endless conveyor 14, disposed perpendicularly to

  the casting belt of pigs 1 and around which cir-

  The scraping modules 10 are formed. It is thus produced in the form of pigtails. As soon as a module

  scraping 10, with the amount of dirt lying in

  closed between the scraping blades 11, is on the horizontal part of the polygonal pattern, above the dirt conveyor 14, the scraping blades 20 are separated one from the other and the dirt 4 falls into

  a shell 26 of the grease carrier 14. By choosing

  With the speed of the slurry conveyor 14 and that of the slat conveyor 8, it is possible for the grit quantities of several shells 2 of the pigging belt 1 to fall into a shell 26 of the slag conveyor 14, where it is sintered. , and

  can be transported without difficulty

  cultured towards his other use. At identi-

  that rotating joints 21, each time op-

  posed, are fixed on the two chains 20 of trans-

  chain carrier 8, articulations 21 on which

  scraping modules 10 are arranged by means of

  fasteners 23, by means of brackets

  lons of articulation 9, between the articulations

21 opposing.

  The scraping modules 10, seven in number

  in this case, are oriented as a result of their

  hanging and the effect of gravity, independently

  the different angles of slope of the path of the chain 25, with their scraping blades 11, being themselves parallel to the surface of the molten metal 3 in the shells 2 of the pig casting belt 1. The view of side shown schematically in Figure 1

  and, in particular, Figure 5 illustrate this

  is lying. Two cylinders 12 with opposite working axis, and, in the extension of the longitudinal axes of the cylinders 12, guide columns 28 are arranged in the housings of the scrubber modules 10, each time reaching the center of the housing, acting sure

  the other half of the housing. So there is always a

  rin 12 and a guide column 28 placed opposite

  rizontalement. Connected mobile sliding parts 13

  the piston rods of the cylinders 12 rest on the co-

  Each sliding piece 13 carries a fastener 29 emerging downwardly above

  of the housing, folded inwards. Slide blades

  clage 11 rest on the folded parts. As long as the scraping blades 11 are grouped one against

  the other by means of the jacks 12, they form a space

  this wedge-shaped to receive the scraped 4 grime

  of the shell surface 2 (Figure 2).

  The width of the scraping blades 11 corres--

  to the width of the shells 2 of the

  1. In the separated state (upper module 10 in FIG. 4), the distance of the scraping blades 11

  is identical to the length of the shells 2.

  In order to prevent the scoring blades 11 from catching in the solidifying metal 3 in the event of casting failures, a hinge 17 is disposed on the polygon portion of the frame 6 which is opposite to the fixed hinge point 19. piston rod

  a lifting element 16 is hinged to it.

  If, in the event of a breakdown, the pigs casting belt i and so also the chain conveyor

  8 with the scraping modules 10 fixed on them are ar-

  the jacked lifting element 12 receives a bias and tilts the frame 6 with the chain conveyor 8 and the scraping modules 10 on the fixed hinge point.

  dirt 4 and molten metal 3 (see

  frame 6 in FIG. 1). The washing stroke 18 of the lifting element 16 corresponds to the minimum of the immersion depth of the scraping blades 11 in

  dirt 4 as well as in molten metal 3.

  The need for compressed air

  as energy for the cylinders 12 is effected by the in-

  intermediate of a rotating distributor 24, mounted on the outer side of the frame 6, approximately in the center of the circulation of the scraper modules 10 (see Figure 4). Through the supply of compressed air 22, the compressed air is brought from

  from this rotary distributor of compressed air 24 to the

  scrapers 10 and thus to the dispensing valves

  The valve valves are arranged in groups and

  controllable. In each scraping module 10 is

  in addition to the controllable group of valves

  30, a wireless signaling system working without contact, for control commands, and a power transmission module

  for compressed air and onboard electrical voltage.

  Transmitters of order 27 are arranged

  on the frame 6, with which the relief valves

  vendors 30 are ordered through the

  signal transmission system, wireless,

  tact, thus causing an opening or closing of the scraping blades and scraping modules 10, in certain positions of the polygonal circulation of the chain conveyor 8. The mode of operation of the. device is

  described below again in principle.

  By means of the adjustable drive 5

  of the pig casting belt 1, the transpor-

  chain drive 8, guided by chain wheels 7 in

  the double-sided frame 6 is moved at a uniform speed

  relative to that of the casting belt of the pigs i and the seven scraper modules 10 pendant on the hinge bolts 9 are transported, in the corresponding working position, above the third shell 2 after casting, the scraping blades 11 plunge open in the layer of dirt and very weakly in the molten metal

  3, and are pushed in the central position, on a

  of one of the transmitters of order 27, by the

  pneumatic rams 12, the grime 4 being collected in the wedge space between the scrub blades

11 closed.

  After the sloping section of 7 'moving identically to the pig casting belt 1, the chain conveyor 8 passes into the section

  slope, making 20 'from the horizon

  tale, then is somewhat deflected upwards in the frame 6, a lifting out of the grime scraping blades 11 closed by lifting the scraping module 10 concerned and the grime 4 remains between the scraping blades 11 closed . The molten remains of the metal 3 can be drained from the scraping blades 11 and, from the corner space they

  form, in the shells 2 continuing to move

  without being trained. By other deviations of the chain conveyor 8, the scraping modules 10

  closed doors arrive in the horizontal section

  above the dirt conveyor 14, o the scraping blades open on a signal of a transmitter order 27, and o the dirt 4 between them falls into one of the shells 26 of the dirt transporter 14 With the scraper blades 11 open, the scraper modules 10 are then transported again to the section of the chain conveyor 8 rising at the same angle as the pig casting belt.

  1, and the scrubbing process starts again.

Claims (1)

  1e) Device for slagging the surface of molten metals in the shells (2) of strips   cast of pigs, using elements of raclage   ge scraping the layer of dirt, moving horizontally against each other, characterized in that   that a frame (6) with a double face, formed in a polygon,   is attached to a sword casting belt (1) and mounted   on it bears, on the faces presenting a   at least the width of the shells (2), a chain conveyor (8) of which the chain wheels (7)   are fixed at the vertex points of the coastal polygon.   of the frame (6), the chains (20) of the conveyor to   chain (8) having a number of articula-   rotating devices (21) arranged at an identical spacing   between which scraping modules (10) are mounted by hanging freely, via   hinge bolts (9) and fixing elements   tion (23); the chain conveyor (8) being co-   driven at synchronous speed via the   sword band (1), the polygo-   of slagging modules (10) comprising a working section of the polygon, which develops under   the same slope angle as the casting tape of   its (1) and the scrubbing blades (11) of the scraping modules (10) guided above the shells (2) of the   swath of pigs (1) being guided in   to plunge very lightly into the molten metal, and a subsequent working section   of the polygon including the lifting of the module of   clage (10) out of the shells (2), the difference between   the slope angle of these working sections of the polygo- not being 13 to 15 '.   2 ') Device according to claim 1,   characterized in that the faces of the frame (.6) form irregular polygons comprising more than four sides   designated as working sections.   3 ') Device according to claim 1,   characterized in that the frame (6) is pivotally attached to   turn of a fixed hinge point (19) horizontal,   Assistant to the front, vertical side of the frame (6).   4 ') Device according to claim 1,   characterized in that a hinge (17), on which   the piston rod of a lifting element (16) is   tic, is attached to the polygon part of the frame   (6) opposite to the fixed hinge point (19).   ') Device according to any one of   Claims 1 and 4, characterized in that the race   the lifting element (18-) of the lifting element (16) is   immersion melter of the scraping blades (11) in the   dirt (4) and the molten metal (3).   6 ') Device according to claim 1,   characterized in that a dirt conveyor (14), of endless type, around which the scraper modules (10) move, is arranged, perpendicular to the pig casting belt (1), in the free space (15) formed by the polygonal layout of the chain wheels   (7) of the chain conveyor (8) arranged in the dre (6).   7 *) Device according to any one of   Claims 1 and 6, characterized in that the transmission   dirt carrier (14) is formed as a strip in pigs.   8 ') Device according to claims 1 and   6, characterized in that the working section of the   the lone bone is arranged horizontally above the dirt carrier (14).   9 ') Device according to claim 1,   characterized in that two work rolls (12) and, in the extension of their longitudinal axes, two guide columns (28) are arranged in the housing of the individual modules (10), horizontally next to one another, and each once arriving to the middle of the crankcase, with an opposite sense of work; movable sliding parts (13) connected to the piston rods of the cylinders (12), resting on the guide columns (28) and fasteners (29) folded inwards, emerging downwards on the housing, being attached to the sliding parts, fasteners (29) on the folded parts of which scraper blades (11) resting in the state in which they are   touch, a wedge-shaped space.   Device according to claim 1, characterized in that the width of the scraping blades   (11) corresponds to the width of the shells (2).   11 ') Device according to claim 1, characterized in that the order transmitters (27) controlled by the chain conveyor (8) are fixed   on the frame (6) to carry out an order without   tact of valve valves (30) cylinders (12)   placed in the scraping modules (10).   12 ') Device according to claim 1, characterized in that it is each time housed in the   scraping modules (10), a controllable group of   valves (30) for actuators (12), a signal transmission system, working wirelessly and   contact, for control orders, and a module.   energy transmission for compressed air and electrical power supply.