DE1508381B1 - Pull stove for a pusher oven - Google Patents

Description

1 2

The invention relates to a pull stove for one of the pneumatic devices provided to ab-pusher furnace, by means of which the residues, which are fluffed on in a heating zone, are periodically removed from the heated fluid To blow support rails forward canals towards their exit end. It benen steel blocks are pierced, the compressed air lances are used for this purpose, which of Draw hearth in the direction of advance of the blocks on which 5 time to time were introduced into the channels The heating zone follows and, in extension, the support to clean it from the waste. Such irritation splints, on which the steel blocks in the heater cannot be successfully traversed with compressed air slide, open-top heaters heated with burners can be conducted, if not a temperature duct at the same time has, through which a compressed air flow for temperature control is made. Also has Removal of scale can be directed. io the inventor found that cleaning the ducts It is known to only use the pulling hearth in the equalizing and crushing of the scale To equip the zone of a pusher furnace with heating ducts, compressed air can be carried out if this in the extension of the slide rails in the heating compressed air intermittently and in proportion zone of the pusher furnace are arranged. These channels short sections are introduced into the channels, are heated with their own burners to the extent of 15 This is according to this invention with the in the the support rails in the heating zone conditional nozzles caused by channels, elimination of sliding marks. After all, it is also known to the temperature hypothermic areas caused by the sliding contact in the compensation zone of shock sources with Tempeder Regulate steel blocks with the liquid-cooled sliding temperature sensors. A regulation of the pipes in the heating zone. 20 Temperature of the compensation zone generally leads to each Heating of metal blocks on rolling machines - but not to the desired effect, it has to be very hot the temperature of each heating channel is formed individually on the surfaces of these Blocks of tinder. This scale is also formed in appropriate temperature measuring devices Areas that are occupied by the sliding tracks, as proposed by the invention, will. In addition, in a preferred embodiment, the surfaces also form on the surfaces Complexes from several Zunderschicher inventions are several at intervals from one another, which form caked sintered bodies. other distributed nozzles provided in the heating channels. Ultimately, even if the heating is too great, they can be fixed in the heating channel the near-surface zones of the steel blocks protruding nozzles or into the heating channel Slag. 3 ° retractable nozzles can be used.

It has now surprisingly been found that, in a further embodiment according to the invention

if the formation of slag is largely avoided, there are cleaning agents at the bottom of the heating channels.

det, the scale can be reduced in size in a simple manner

and can be discharged if you have completely loaded scale as well as to remove possibly adjacent Temperature ranges are used intermittently for slag that does not fall.

warmed compressed air through the heating ducts in the drawing

stove along these channels. This unheated example is explained.

Compressed air causes the in plates with dimensions F i g. 1 shows a longitudinal section through a typification Scales of several millimeters can be seen in pusher furnaces for steel blocks and the like, the Merkin small pieces can crumble and blow off, 40 times according to this invention; when it is not heated to such high temperatures F i g. Fig. 2 shows an enlarged perspective part; that it becomes liquid on the surface. partially looks at the section of the pull and the The invention therefore solves the problem of providing the associated components of the in FIG. 1 shown the sliding tubes to compensate for the sliding furnace;

traces of downstream heating channels in the drawing 45 F i g. 3 shows a longitudinal section of the scale produced by the hearth without impairment or plant along the line III-III in FIG. 2; Interruption of the continuous mode of operation F i g. 4 shows a cross section of the FIG. 3 of which To eliminate pusher furnace. For this purpose, according to the system provided on line IV-IV in this figure; of this invention in the heating ducts intermittently F i g. 5 shows in a similar longitudinal section pressurized with compressed air along the channels 50 illustration as in FIG. 3 a firing device according to the invention Jet generating nozzles and tempering, but with a different embodiment of the raturmeßeinrichtung provided in each channel, cleaning device for the channels; the burners heating these channels individually F i g. 6 shows, similar to that in FIGS. 3 and 5 one steer. The invention therefore consists in the grain furnace according to the invention in section, but with Bination of the arrangement of with not heated 55 yet another cleaning device for the Pressurized nozzles in each of the heating troughs;

channels and the arrangement of a temperature measuring F i g. 7 shows similarly to FIG. 3 a longitudinal device in each heating channel through which the cut through a furnace according to the invention, depending on the temperature in the heating channel, e.g. via but with other burner and cleaning constructions Control of fuel supply to the equivalent of this invention;

corresponding burner, can be set precisely. If this F i g. 8 shows similarly to FIG. 3 in a longitudinal temperature is kept below the temperature, cut a furnace according to the invention, but with in the case of the metal of the corresponding by that of another embodiment of the Brennerkon furnace The struck blocks melt, then the struc- ture can be used in combination with the cleaning process the nozzles are directed along the channel pressure directions according to FIGS. 3 and 7; air flow for both shredding and loading. 9 shows an elimination of the invention in a plan view of the scale. moderate firing, but with a further off-after an older suggestion by the inventor is the embodiment of the sewer cleaning device;

3 4

10 shows an enlarged partial longitudinal section when the steel blocks 16 on the draw hearth 20

of the movable nozzles shown in FIGS. 2, 3 and 6 are advanced, they slide on non-refrigerated

are shown; Support rails 88, e.g. B. from steel strips

F i g. 11 shows a cross-section through the in or heat-resistant profiles, which are upright in the F i g. 10 arrangement shown along the Li 5 masonry of the stove 20 are embedded. At this

never XI-XI; The embodiment is the rows of slide rails 88

F i g. 12 shows a longitudinal section of another arranged next to the heating channels 72. Embodiment of the movable nozzle structure - Each heating channel 72 is in this embodiment tion; 13 shows an enlarged cross-section of the burner 74 provided at its charging-side end. Combustion air and Brennin The device shown in Fig. 12 along the fabric are connected to line via a manifold system 92 XIII-XIII of this figure; guided.

F i g. 14 shows an electrical schematic and one embodiment of a torch construction a flow diagram according to this invention, and is shown in FIGS. 3, 4 and 5 shown. In this Aus-Fig. 15 shows in an electrical circuit diagram 15 guide form, the burner 74 a casting 100 an arrangement according to this invention to in time, which has the shape of an inverted L and from Licher consequence the pneumatic cleaning device is made of a heat-resistant alloy, such as. B. lines for a furnace according to this invention to operate from high temperature resistant corrosion resistant. Stole. This casting has an opening 102 and an in FIG. 1, a pusher furnace 10 with a draw hearth 20, mixing plate 104, the air openings 106 and a 20 according to this invention is shown schematically. Has central opening through which the fuel die blocks 16 are extended as they pass through the furnace nozzle 108 . The nozzle 108 is fed via the thrust, in the heating zone 24 and 26 from the fuel line 110 , the support nozzle formed partly by the water-cooled tubes 18 and the mixing plate 104 and partly by tongue rails and in the compensation zone 22 by the 25 devices, which will be described later, carried ge pull-out hearth 20, which will be held at the same height as that. The fuel line 110 is arranged in the essential sliding tubes. borrowed concentrically to the lower opening of the cast burner 28 for heating the compensation zone 22 partially 100 , so that an annular seal is formed in the wall 30 at the outlet of the furnace 10 burned air duct 112 is arranged. Heating burners 40 and 42 are shown in the top 30. As can be seen more clearly from FIG. 4 as can be seen, end wall 36 and in the lower end wall 44 open a pair of nozzles 116 through which a suitable one flows around the upper and lower regions of the printing medium, such as e.g. B. air or exhaust steam, heating zone 24 or 26 to heat. immediately adjacent to the bottom surface of the channel 72 in the steel blocks 16 are through the furnace 10 this. These nozzles 116 are pushed out of the pressure line by being fed successively at inlet 35 118 (Fig. 3) which are inserted across the front-12, each being the last part of the range 20 and in this execution block at The outlet end of the furnace 10 is pushed out of which, for example, by the molded-on jackets 114 of the sem. Burner constructions 74 extends. The air currents from FIGS. 1 to 4 it can be seen that the drawing from the nozzles 116 clean part of the channel 72. stove 20 has a number of relatively narrow heating 40 As already mentioned above and best in channels 72, which are heated with burners 74 F i G. 4, a pair of manifolds 92 are used in this to heat the steel blocks 16 directly under the slide assembly according to the invention, with tracks. Each distributor 92 has corresponding air and gas connections.

processing of a liquid-cooled tubes 18 trained In one mode of operation of this invention may Deten support rails are aligned, on a stoichiometric amount of air to each Verdenen the blocks are fed through the heating zone 24 of the impact separator 92, the maximum of the furnace 10 in the Pull hearth 20 are pushed. Fuel Consumption of Corresponding Burner - The cooker 20 according to this invention is equivalent to 50 Paares74. When setting the Flam devices for supplying and setting the temperature, normal fuel and combustion air for the burner current can be assumed, which is less than the 74, with nozzles for cleaning the heating channels 72, corresponds to the maximum fuel capacity by Removal of scale and the like and equipped with means of more or less fuel to each burner 74 for individual control of the temperatures in the 55 by suitable individual setting of corresponding heating channels 72. Valves is supplied. This temperature control When in the F i g. 1 to 4 of the drawings - the flame normally leads to different embodiments according to the invention, quantities of excess combustion air are carried to the hearth 20 by iron profiles 76, the burners 74 and are supported on I-beams 78 for most applications. The pull stove 60 is sufficient for purposes.

20 consists of a masonry 82, which is directly on When the arrangement according to F i g. 2 and 3 for

the iron profiles 76 rests, an intermediate wall removal of scale and possibly other things

Plant 84 that can withstand high temperatures and a material from each heating channel 72 is each of the channels

Covering masonry made of a plastic refractory 72 provided with a round bottom. At the dar-

Material 86. The thickness of the face masonry 86 65 is also a cleaning opening

varies from 10 to 25 cm. It is at this Aus 150 in each of the channels or channels 72 on the

Guide shape used to provide the heating channels 72 to the outlet end thereof. The travel

form. Inclination openings 150 extend vertically

Direction through the masonry of the range 20 and communicate with corresponding openings 152 in the iron profile supports 76. The openings 152 have hinged covers on their underside 154, which is controlled by a suitable operating mechanism, such as e.g. B. a compressed air cylinder 156, can be operated. Each of the lids 154 has a layer 157 of heat-resistant on its upper side Material that shields the lid 154 from the hot scale and slag, which are blown into the corresponding opening 150. It is also contemplated that each of the Openings 152 can open directly into a transversely extending channel (not shown), which follows directly under the openings 152. A puff of air can periodically pass through the duct Appropriate facilities (not shown) are conveyed to remove the waste that comes out of the cleaning openings 150 and 152 and that is in the channel collects, remove.

Each channel 72 is between the corresponding cleaning port 150 and a location near the corresponding burner 74 periodically by pneumatic or by another fluid medium

Follow to the cleaning port 150 to operate the nozzles. A circuit according to the invention, in order to carry out this time series operation, FIG. 14 and 15 shown.

The portion of each channel 72 between the corresponding burner 74 and the next nozzle 158 becomes cleaned by the above-mentioned jet nozzles 116, which are located in the burner jacket 114. To the other ends of the hot runners 72, i. H. in the part between the discharge elbow 32 and the cleaning opening 150, the flushing takes place through one or more fixed nozzles 162.

In Fig. Fig. 5 shows a sewer cleaning assembly according to this invention having movable nozzles 164 are replaced. The number of nozzles 164 is depending on the length of the corresponding Channels 72 'selected. In this arrangement, each nozzle 164 consists of a tube 166 made of a refractory Alloy that extends upward through an opening in the hearth 20 'to the sole of the corresponding heating channel 72 'extends. In this example, the fixed nozzles 164 stand a short distance over the sole of the heating channel. These protruding ends 168 have the nozzle mouthpieces 170,

actuated devices flushed the several nozzles 25 from which air flows periodically along the arrows 172 have, which are generally blown by the reference numerals.

158 are indicated. Air, water vapor or a to prevent scale or other

other suitable print medium that is stuck to nozzle ends 168 under pressure may be passed through nozzles 158. Ramps 174 are provided. The top of the nozzles 158 can preferably be designed so, 30 ramps 174 are flat in this example and that they protrude upwardly into the channel 72, if at a slight incline, in order to blow off compressed air or other pressure medium
and automatically fall back into positions
in which they do not protrude into the canal,
when the compressed air supply is interrupted. One
such ascending nozzle structure 158 becomes
shown in Figs. Other devices that work independently of the supply of the print medium can be used to
slide the nozzles 158 back and forth.

In this arrangement, five jet nozzles 158 are provided, each of which passes through a plug 160 of refractory material which in turn is snugly seated in openings that extend into

To ease scale through the appropriate nozzle. The undersides of the ramps 174 are curved and complementary to the abutting surfaces of the channel bottoms, so that the ramps 174 lie snugly. The slight inclinations of the ramps 174 also reduce the impact of hot burner gases on these ramps. As in Fig. 5, the nozzles 168 are embedded in the ramps 174. Of the Operation of the fixed nozzles 164 can also be carried out simultaneously or in chronological order, depending as desired.

In Fig. 6 is another pressure medium actuated cleaning device in accordance with the inventors of the present invention, and which shows the bottom surface 45 used in heating channels 72 'or the bottom surface of each channel 72. The stopper can be. In this arrangement, each 160 may be made of alumina, channel 72 'has multiple cleaning openings 176 which are spaced apart along the range 20' of blasting nozzles 158 to provide additional thermal insulation for the air nozzles. The plugs 160 are arranged in a straight line. The cleaning openings 176 are internally also designed in the same way as the cleaning openings and can be broken and replaced without changing the jet nozzles 158, 50
Damage the jet nozzles 158 or the
To deform plug tightly surrounding openings of the combustion system. It is in accordance with this invention

it is provided that the air jet nozzles 158 simultaneously advance when blowing off scale and slag. or are preferably started up one after the other. In the arrangement according to FIG. 6 are at the can be used to achieve uniform cleaning and to be economical with the print medium apply. It is also intended that the

gen 150 and 152 (see Figs. 2 and 3). The use of several cleaning openings 176 is expedient, if relatively long heating channels 72 'are provided or if unusually difficult conditions

At the ends of the channels 72 'fixed nozzles 116' and 162 'are provided. Between these fixed nozzles the cleaning ports 176 and are movable

'Arranged h blowing out of the respective channels 72 in timed nozzles 60 158'α and 158th The nozzle 158 ' b

Order one after the other. In the case of a blowing out in chronological order Arrangement, the jet nozzles 158 of each channel 72 can be operated in series by

is constructed similarly to the nozzle 158 in the FIGS. 3 and 4 shown device, while the nozzles 158 α differ in that they have a pair of nozzle instead of a nozzle opening

the nozzle that has openings after the cleaning opening 150 (see FIG. 10). If that's why the

is located, with the blowing out begins, then the nozzle is put into operation, the ejected

the blowing out against the corresponding burner 74 sliding parts (see description below) of the central

to continued and then in reverse row leren nozzle 158'α (relative to the cleaning openings

176) Air currents in opposite directions, Fig. 2 and 4 shown the same. One or more as indicated by arrows 178 and 180. fixed nozzles 245 are on either side of each. If, on the other hand, the unidirectional blowing burner 231 is positioned to pressurize the adjacent ascending nozzle 158 '& to clean central portions of the channel 72',
this pushes a stream of air, as indicated by the arrow 180 5 in F i g. 9 is a further cleaning device is indicated, only in the direction of the last cleaning according to this invention with fixed nozzle supply nozzle 176 from. shown. The nozzles 244 are arranged in pairs on the pneumatically operated cleaning device so that they extend to the ends of a pair according to FIG. 6, the rising nozzles will open from cutouts or niches 246, which and the fixed nozzles actuated simultaneously. io in the bottom wall of the heating channel next to the side walls of which the respective end sections of the channels 72 will be arranged. The niches 246 and through the fixed nozzles 162 'and 116', the nozzles 244 are cleaned somewhat obliquely inwards as described above. If the heating duct is inclined so that the center lines of the desires, the ascending nozzles 158'α and nozzle jets, as shown by the dashed jets 158 '& with tubular plugs, such as plugs 15 248, each nozzle pair 244 can be in 160, in the description of the F i g. 4 mentioned general at the center line of the canal bottom and were to be equipped. expediently with the following couple

In Fig. 7 is an embodiment after that of jet nozzles 244, the one of the Invention shown, in which a pull hearth 182 with burner 74 'the most distant nozzle pair 244 longitudinally extending heating channels 184 generated 20 rays that overlook the single purity is. The channels will meet with a burner port 150 'of each channel. Each nozzle-186 at the outlet end of each channel 184 pair 244 can be simultaneously with the other or in heated. With this arrangement, each heating-time sequence ends up being operated with these, channel 184 into the heating zone 26 'of the oven 10. The position of the nozzles 244 relative to the niches Scale that collects in each heating channel 184, 25 246 eliminates the need for ramps as shown in is actuated by the pressure medium nozzles F i g. 5 are to be provided. Furthermore blown into the lower heating zone 26 'of the furnace, from the precipitation of scale in the niches which he periodically prevents together with the other waste 246 by the rays 248, which periodically igniter or removed with the other slag, blown lengthwise through the niches, can. 30 At the end of the heating channel near the burner 74 '

Nozzles 158 'are in the middle of the channel bottom, in the same way a pair of nozzles 244 and 244 orderly. The nozzles 158 'and the nozzle 208 may or may be arranged in niches 246 (not shown) if desired, in the same way one after the other - the nozzles 116 (FIG. 4) can be inserted into the burner conander or operated at the same time. construction. On the other hand, for FIG. 8 shows an arrangement in which each heating channel 72 'according to FIG. 10 is an identical pair ensures that the burner flames are provided along the length of the nozzle 244 λ and niches 246 a throughout the channel 72 'be substantially continuous so that their rays also extend in the middle. This arrangement has a wider area where the cleaning opening 150 'meets. Alter nozzle design according to this invention. A native arrangement of fixed double head burners 231 is in the center of each channel 40 nozzles 162, as shown in FIG. 3 is shown on 72 'are expediently used on a transverse end of the channel. The usage device extending air manifold 233 attached. The of fixed nozzles 244 in the niches 246 Burner has a pair of mixing plates 235 which are positioned in the channel section between burner 74 ' in opposite wall parts of the burner and the cleaning opening 150 'is advantageously arranged in this respect are and with a common combustion 45, as no protruding parts of the nozzle construction air chamber 237 in the burner communicates the runoff of scale and dust along the ren. For independent control of the separated canal floor under the influence of the beams 248 Channel sections through thermocouples 239 and prevent.

a circuit coupled therewith, as shown in FIGS. 10 and 11 is an exemplary embodiment

15, the fuel nozzles of a movable substance nozzles emerging from the channel bottom are individually connected to the nozzle construction according to this invention with separate fuel lines and are provided via externally actuated valves which are used for the nozzles 158 (F i g. 3), 158 ' b tile 243 controlled. Alternatively, the fuel (Fig. 6) or 158 '(Fig. 7 and 8) can be used,
lines 241 and the lines feeding them. In the view shown in FIGS. 10 and 11, the insulating jacket of the plug divider 233 is essentially enclosed in the air arrangement. The burner 231 can 160 on the flange 222, on the profiles 76 (Fig. 2). therefore the flames to the outer ends of the fastening can be conducted by means of bolts or through ducts. At the outlet end of each channel welding or the like. Take place. The flange 224 of the 72 'is provided with a cleaning opening 150', while the flange 222 is screwed, the other end of each channel opens in the lower 60 sem embodiment with the upper end of the heating zone 26 '. In this way, the Reini cylinder 252, for example by welding, is firmly connected to the supply device of each right channel section at. An annular piston 254 can in this embodiment, similar to the cleaning cylinder 252, a reciprocating movement device according to FIG. 7, with the exception, however, that in this embodiment three nozzles 158 'are used due to the relatively smaller 65 against the inner wall of the cylinder, for example length. The cleaning device with an O-ring 256, off. The piston 254 is, on the other hand, welded to a tube 258 for the left-hand channel sections which, under the drive of the same exception generally for that of the piston 254, has a reciprocating motion.

009547/143

ίο

execution in a guide tube 260. The lower end of the guide tube sits in a hole 262 of the mounting plate or the flange 222. In this position, the guide tube 260 is with the Bore 262 through which tube 258 extends, precisely in line.

The annular piston 254 is in the upward direction, based on the illustration in FIG. B. by Compressed air entering cylinder 252 through the inlet

required to eject the print media through orifice or openings 268 and the To raise the piston and tube. Therefore, the inlet port 264 and the guide tube 274 with various compressed air supply sources via, for example, the distribution lines and connecting pipes be coupled.

Another arrangement that prevents the piston from rotating and keeps the nozzle opening in place

Opening 264 at the lower end of this cylinder is in alignment with the channel and can be moved in one direction. When the piston 254 is provided according to the borrowed nozzle structure 158 ', as lifted above, it takes the tube 258 into it
Operating position with that indicated by the dash-dotted line

Outline 266 is indicated. At the same time occurs

In the extended position of the nozzle tube 258, an air jet along the heating channel is through the Blown nozzle orifice 268. With one in two directions

them in the fig. 12 and 13 is shown. In this arrangement the tube 258 'is with an annular piston 269 at the location of an eccentric opening 271 of the KoI-the high pressure air in the pipe 15 bens connected so that the central axis of the pipe 258 through the central opening of the annular piston 254. 258 'and the opening 262' of the mounting flange,

through which the nozzle tube extends at a distance, offset from the central axis of the cylinder 252 ' are. The piston 269 is operated this way

radiant nozzle, such as B. by the nozzles 20 against rotation relative to the cylinder 158'α (Fig. 6) can be a further nozzle opening 268 ', the eccentric arrangement of the tube 258' in Fig. 10 is indicated by dashed lines, on the upper secures which in this position, in which its axis End of the tube 258 may be provided at a point relative to which the cylinder 252 'is offset through which which is diametrically opposite the nozzle opening 268. Guide tube 260 'is held. That way is In order to ensure that the nozzle opening or nozzle opening 268 "is always correctly aligned with the heating die Nozzle openings 268 always in alignment with the duct when using the nozzle construction longitudinal axis of the heating channels remain are aligned with the invention.

proper means are provided which allow rotation. The guide tube 260 'fits snugly into the eccentric

of the annulus 254 and the tube 258 prevent. Opening 262 'and extends in this arrangement An arrangement according to this invention which has a 3 ° downward (see FIG. 15) into the cylinder 262 ', being prevents such rotation, a guide 270 has the lower end 273 of the tube serving as a stop, on, which is located in the axial direction inside the cylinder to slow down the movement of the piston 269 downwards 252 along the path of the piston 254. An inlet 275 is on the cyst stretch. The piston 254 has a corresponding opener 252 'to bring a pressure medium to the upper side opening 272 through which the guide 270 extends to apply 35 of the piston 269 and thereby to geso that the piston 254 on the guide 270 while ensuring that this piston retracts when the its reciprocating motion slides. The nozzle design is not used. The lower Guide ring 270 and opening 272 are, based on the end portion of the guide tube, is expedient Nozzle opening or the nozzle openings, provided in the pipe with a wear-resistant coating 277 to 258 arranged to cause a tight fit and reduce friction during service life 40 the nozzle construction, the correct jet direction between the jet pipe 258 'and the guide tube is guaranteed. 260 'to reduce.

According to a further feature after this he- In operation, the upwardly extendable nozzle

10 or 12, the guide 270 can take the form of a hollow construction 158 'as shown in FIG Have tube 274 with an external thread. A 45 pressure medium is actuated through inlet 264 A source of compressed air can then be introduced with the guide tube or 264 '. The resulting pressure-270 connected and pressure medium in the lead waste at the nozzle opening or at the nozzle opening tube 270 are initiated periodically when the collisions of the jet pipe 258 or 258 'causes ben254 and tube 258 in their retracted onto the underside of piston 254 or 269 Position should be moved. With this arrangement 50 pressure is exerted which displaces the piston and It is not necessary to focus on the gravity by using the jet pipe 258 connected to it left to move the moving parts of the nozzle cone or 258 'into its operating position, which executes through

the outlines 266 and 279 'is indicated. Use of the extendable nozzle assembly 158 other pressure medium through the inlet port 264 55 or 158 'reduces the thermal load of the

to bring the structure into its retracted position after the supply of compressed air or a

is finished.

In the illustrated arrangement, movement of the piston up through bore 276 is on the outside of the flange 222, which serves as a stop, limited. In this position the through the inner open end 278 of the guide tube protruding from the closely fitting opening 272 of the piston Compressed air introduced, and the resulting restoring force on the upper surface of the KoI-

Radiant tube 258 or 258 ', as this tube is only pushed into the burner flame for a short time and during this time the pressure medium flows through the pipe, which cools this pipe.

In Fig. 14 of the drawings is a schematic electrical circuit for controlling the device according to the invention is shown. In the arrangement shown switching devices are provided to switch the cleaning devices in chronological order

bens 254 pushes this piston 254 and the tube 65 according to FIGS. 2 to 4, 5, 7, 8 or 9 to be operated,

258 back if desired. The pressure used to automatically adjust the temperature of the burner flames to reset the tube 258 and piston 254
used may be less than the pressure,

using a temperature sensor, such as. B. a thermocouple 280 ', in each heating channel

11 12

in order to close the valves in the secondary to a high pressure air distributor 326 from the outside via an air combustion air system set and line 328 connected from the outside. Individual valve-controlled and in chronological order or simultaneously the connection lines 330 are between the air line Locks or flaps or openings 150 or 328 of each channel and the nozzle structures 158 ' 150 '(see Fig. 2 to 4, 7, 8 or 9) to open, and / 5 is provided. A two-way solenoid valve 332 is located or in order of succession in each connecting air line 330. pneumatic cleaning devices of the single- The air jet nozzles 116 'and 162' at the ends

N heating channels 72 or 72 ', if desired, for each heating channel 72' are used in this embodiment. It is of course pointed out that other switching arrangements may also be used, for example on transversely extending air, as distribution lines 334 and 336, respectively and that one or more features after that each having a two-way solenoid valve 338 Invention can be chosen so that its control is connected to a parallel high pressure line 340, mechanism can be operated by hand. in this embodiment directly with the

In the case of the last-mentioned arrangement according to this Er feed line 342 for the high-pressure air distributor 326 The controller and the supply 15 are connected. With this arrangement according to the Circuit designed so that four heating channels, like the invention, the solenoid valves 332 and 338 in z. B. heating channel 72 ', as in FIG. 9 is shown, rinsed chronological order energized to the tinder or can be. With this arrangement, four different trash are added to each individual cleaning port To advance air distributor 98 'for the burner front 150' of each heating channel. One direction of arrangement with four individual fuel lines 140 ', 20 opening to the jet nozzle 218', 116 'and 162' in time extending through the manifold is used. Licher order to operate is described below The fuel lines 140 'are individually by hand in FIG. 15 described in more detail. In the arrangement burners74 ' tied together. The fuel, e.g. grounding according to Fig. 14, can be any medium nozzle cone, that to the burner 74 'through the fuel line 158' is individually regulated by a valve 332 lines 140 'will be supplied in the one shown 25, while the nozzle structures 116' and Embodiment by an equal number of 162 'at the two ends of all heating channels with one pneumatically operated valves such. B. the valve single valve 338 or 340 can be controlled-290, individually controlled. nen to get adequate airflow to each of the

The operation of each valve 290, the central portion nozzle 158 'in this embodiment to be guaranteed in series with one hand-finished.

actuated valve 134 is switched, each of the middle nozzle structures 158 'each

Temperature signal controlled by a thermal channel 72 'is further from a source with relative element 280 'is generated, which is fed in the lower air pressure to flow through speaking heating channel 72 'is located. Each of one of the nozzle structures arranged in the center The signal generated by the thermocouple is transmitted through lines at all times for the purpose of cooling the nozzles and for gen 292 to a converter or electropneumatic- Prevention of dust system in the nozzles upright Converter and fed to an amplifier 293. An example of an arrangement of this type its output with a synchronization regulator 294 has a second parallel air line 344 which is coupled, which the pneumatic valve 290 is coupled via with the high pressure air line 328, such as line 296 actuated. Expediently, it is also indicated by the reference number 346. A if a temperature recorder or the like 298 suitable flow regulator 348 is located in the connected to the thermocouple. Low pressure air line 344 to reduce the air pressure

The fuel lines 140 'are more expedient to adjust the line to the desired level, Usually connected to a fuel distributor 300. Alternatively, of course, the low-pressure line 344 the one, which in turn is coupled 302 from main fuel line 45 to a low pressure source (not shown) via a suitable flow regulator 304 and pelt. The middle nozzle constructions 158 ' a measuring device, for example a manometer 306, is fed to the low-pressure line via a T-connector will. In the same way, the air chamber is fertilized and connecting lines 350 are coupled. A 130 'of the connecting air distributor 98' from a shut-off valve 352 is in each of the connecting lines suitable combustion air source, such as B. arranged by a 50 350 to prevent himself from being in the Blower 308 via a pressure switch 310, a measuring low pressure line 350 builds up a high pressure, device, for example a manometer 312, and when the solenoid valves 332 are open, manually operated valve 314 powered. The primary if, on the other hand, the upward sliding

Combustion air in this way to the distributor nozzle structures 158 (Fig. 3, 10 to 12) 98 'is fed directly to the burners 74' 55 is used in place of the fixed nozzles 158 ' conducted, which are arranged on the manifold 98 '. , the low pressure air lines 344 and A secondary combustion air manifold 316 is used through 350 to supply air to cylinders 252 to route a valve 318 with the air supply line 320 through the guide tubes 274 when it is not tied together. The secondary air line 316 feeds via is expedient, relying on the weight of the tubes 258 individual lines 322 to leave the secondary air inlets 218 ', 60 in order to remove them from their operating position each of which withdraws at least one jet nozzle cone.

Structure 158 'in each heating channel 72'. As above with reference to FIG. 3 has been described,

The valves 324 are expediently arranged as a magnet, each cleaning opening 150 'with a hinge valve formed or have a similar conical lower cover 154 'fitted to the structure so that it can be accessed from the outside by suitable 65 in this embodiment through the air cylinder electrical lines and switches (not shown) 156 ', if desired, is opened. The double-operated can be. Acting air cylinder 156 'is expediently each of the jet nozzle structures 158' is through a four-way solenoid valve 354, which extends through

Spring force resets by itself, and via output lines 356 controlled. A speed control valve 358 is disposed in each output line 356 to control the speed of the air cylinder 156 'in each direction in a conventional manner. The four-way valve 354 of each air cylinder 156 'is supplied by an inlet conduit 360, the inlet conduits in this exemplary embodiment connected to the supply line 342 for the air distributors 334 and 336 is. In this embodiment, the cylinder control valve 354 is also formed so that it with a switch 362 arranged outside the arrangement and via electrical lines 364, the are connected to a suitable power source by supply lines 366, operated from the outside can be.

In Fig. 15 shows an example of a circuit, around the nozzles in chronological order, as shown, for example, in FIG. 14 are arranged to operate. In the circuit of Fig. 15, the various circuit components are used as required energized or de-energized when the circuit is actuated, solenoid 368 of valve 338, in turn the burner nozzles 116 'operates, is actuated.

The coils 370 of the center valves 332 and the coil 372 of the valve 340 for the nozzles 162 'on the the other end of the heating channel 72 'are in the one shown in FIG. 15 coupled circuit shown so that the nozzles of each heating channel 72 'from left to right and then from right to left along the channel are switched in time, so that in each operating cycle each of the nozzles 158 'and the The pair of nozzles 116 'are actuated twice, while the pair of nozzles 162' at the other end are actuated only once will. To this end, each of the solenoids 368 and 370 is one with two pairs of contacts Step switch coupled, shown in Fig. 15 by the step coil 374 and Kontaktkaare Ml to M14 is. The solenoid 372, on the other hand, is connected to a single pair of contacts M 7. It is Of course, it is clear that any other appropriate timer for the operation of the nozzles is dependent of the order in which the contacts of the tap changer are connected to the solenoids 368 to 372 can be used.

The last contact Ml-M14 is connected in series with a relay coil 376 which forms a part of a time delay circuit, which is shown in Fig. 15 by the timer motor 378 and contact pairs DTL to DT4. The purpose of the latter connection is explained below. The operation of the tap changer 374 is controlled by a pulse timer represented by its relay coil 380 and timer motor 382. At the end of each previously set pulse, the pulse timer coil 380 closes the normally open pulse timer contacts PT2, which in turn actuate the step switch 374. At the same time the normally closed pulse timer contacts PT1 are opened by means of the coil 380 in order to set the pulse timer again. This continues until the on-load tap changer has been moved through a complete cycle, after which the closure of the switch's end contact pair M14 energizes the delay timer coil 376.

The latter coil closes the normally open delay contacts DT 2 which energize the timer motor 378 of the delay timer.

At the end of the preset time cycle, the delay timer closes the normally open contacts DT 4 to initiate the operation of the pulse timer and 382. Thereafter , the delay timer contacts DT 2 to DT 4 are opened and the contacts DT1 to DT 3 are closed in order to set the delay timer back into the excitable state.

To the time sequence circuit according to F i g. 15, e.g. B. for experimental purposes by hand, a push button switch 384 is arranged in parallel with the pulse timer contacts PT 2 to enable the step switch 374 to be energized.

Claims (9)

Patent claims: 1. Drawing hearth for a pusher furnace through which the steel blocks advanced in a heating zone on liquid-cooled support rails are pushed through, the drawing hearth following heating zone a in the advancing direction of the blocks and in extension of the support "rails on which the steel blocks slide in the heating zone , has open top heating channels heated by burners through which a pressure medium, preferably compressed air, can be passed to remove scale, characterized by jets arranged in the channels (72, 72 ', 184), intermittently charged with pressure medium, directed along the channels generating nozzles (116, 116 ', 158, 158', 158'α, 158 ' b, 162,162', 208, 244, 244 a, 245) and by temperature measuring devices (134,239,280,280 ') in each channel, the burners heating these channels (74,184, 231) individually. 2. Pull stove according to claim 1, characterized in that a plurality of nozzles are arranged in each channel which extend through the channel wall into the channel. 3. Pull stove according to claim 1 or 2, characterized in that the channels (184) open into the heating zone of the pusher-type furnace, that the burners (186) are arranged at the other ends of these heating channels ( and that the nozzles are arranged and so designed are that they generate pressure medium jets in the direction of the channel openings towards the heating zone. 4. Apparatus according to claim 1, 2 or 3, characterized in that each channel at least has a cleaning opening (150, 150 ', 176). 5. Pull stove according to one of the preceding claims, characterized in that each Nozzle construction in the area in which it is passed through the draw hearth from an insulating tubular plug (160) is surrounded. 6. Pull stove according to claim 1 or 2, characterized in that the nozzles of the hot Burner gases are protected by ramps (174) located at the bottom of each of the heating channels. 7. Pull stove according to one of claims 1 to 4, characterized in that the nozzles (158, 158 ', 158'α, 158' b) are arranged displaceably into and out of the heating ducts. 8. Pull stove according to one of the preceding Claims, characterized in that the nozzles in each channel in chronological order can be operated one after the other (Fig. 16). 9. Drawing hearth according to one of the preceding Claims, characterized in that the Temperature measuring devices (280, 280 ') located in the channels control a regulating mechanism which in turn controls valves (134) located in the fuel supply lines (140, 140') to the burner nozzles. For this purpose 4 sheets of drawings 009547/143