JP2011063872A - Cutting out device of pusher-type furnace for heating steel slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting out device of a pusher-type furnace for heating a steel slab, which can surely cut out billets one by one with a simple mechanism even if there is a welded billet. <P>SOLUTION: The cutting out device 1 is installed in the pusher-type furnace 20 for heating the steel slab, transfers a plurality of steel slabs 10 mounted on a plurality of skid rails 11 onto a transfer roller 15 located in front of the skid rails 11 one by one, in the furnace, and includes: a rail-like guide slope 13 which shows an upward slope leading to the top face of the front end of the skid rails 11; a rail-like discharge chute 14 which guides the steel slab from the top of the guide slope 13 onto the transfer roller 15; and an elevator 2 which is located in the middle of the adjacent skid rails 11 and slightly in front of the top of the guide slope 13, and is provided with an elevating tool 3 having a steel slab upthrust tip that is located at a lower position than the face of the guide slope 13 in a standby position and projects to a higher position than the face of the guide slope 13 when lifted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a slab cutting device for a slab heating furnace, and more specifically, a plurality of billet slabs placed on a fixed rail in a pusher type slab heating furnace and sequentially pushed out are taken out one by one. The present invention relates to a cutting device to be performed.

  In a rolling mill, there is a heating process in which a billet steel slab, which has been continuously cast or roughly rolled, is further heated in a rolling process to a predetermined temperature in a heating furnace, and a pusher is used as a means for continuously heating the billet steel slab. Type billet furnaces are widely used.

  In this pusher type billet heating furnace, billet billets are placed on a fixed skid rail in the furnace so that they are positioned in parallel, and the billet billets are heated by a burner at a predetermined temperature. To rise or hold. In the pusher-type billet heating furnace, billet billets are charged by the pusher in the charging section, the billet billets placed in the furnace are extruded, and the plurality of heated steel pieces are extracted by the extraction section. A cutting device is installed to take out the pieces one by one.

  As shown in FIG. 5, the cutting device 1 is provided in the vicinity of the fixed skid rail 11 on which the billet steel pieces 10 that have been heat-treated are placed and transported, and the extraction end of the fixed skid rail 11, It consists of a chute 14 to be connected. The billet steel slab 10 located at the terminal is pushed out by the subsequent billet steel slab 10 group and falls from the fixed skid rail 11 onto the conveying roller 15 via the chute 14. Moreover, the billet steel pieces 10 that have fallen are transported on the transport roller 15 with a space from the subsequent billet steel pieces 10 group. The billet billet 10 is intermittently pushed out by a pusher (not shown) that moves forward and backward provided in the charging section.

  In the cutting device 1 described above, when the billet steel pieces 10 on the fixed skid rail 11 are welded and extruded in the heating furnace 20, the billet steel pieces 10 are passed from the fixed skid rail 11 through the chute 14. Since the roller falls to the conveying roller 15 due to gravity, it may not be possible to separate the rollers one by one in this process. In this case, the work of separating the welded billet steel piece 10 on the conveying roller 15 is difficult and time consuming, resulting in a series of production processes being disturbed. Further, in some cases, the welded billet steel pieces may hit the furnace wall 21 or the outlet door 22 of the heating furnace 20 and damage the wall. An effective means for this problem is disclosed as a prior art (Reference 1).

JP 2001-271118 A ([0016], [0025,0026] [FIG. 6])

  The prior art is composed of a steel bar mounting surface and a shaft bar having a projection, and the steel bar is cut out by two movements of advancing and retreating and rotation of the shaft bar. In this prior art, the steel piece is welded and separated by rotating the protrusions and scraping the steel piece diagonally in the major axis direction, and there is a risk of scratching the steel piece. There is a problem that the device is complicated because it requires a rod advancing and retracting cylinder, a rotating cylinder, and the like.

  The present invention solves these problems, and it is a pusher type slab heating furnace that can reliably cut out billet slabs one by one even if there is a welded billet slab with an apparatus having a simple mechanism. An object of the present invention is to provide a cutting device.

In order to achieve the above object, a pusher type billet heating furnace cutting device according to claim 1 of the present invention is attached to a pusher type billet heating furnace, and is placed on a plurality of skid rails in the furnace. In the cutting device for transferring a plurality of steel pieces one by one onto a conveying roller located in front of the skid rail, the lifting tool for pushing up the leading steel piece is placed between adjacent skid rails in the skid rail extraction unit. It is provided in a part. According to a second aspect of the present invention, there is provided a pusher-type billet heating furnace cutting device attached to a pusher-type billet heating furnace, wherein a plurality of billets placed on a plurality of skid rails are mounted in the furnace. In a cutting device that transfers one by one onto a transport roller positioned in front, a rail-shaped guide slope that is connected to the upper surface of the front end of the skid rail, and a guide roller that is guided from the top of the guide slope onto the transport roller. Between the adjacent rail-shaped discharge chute and the adjacent skid rail. And a lifting device including a lifting tool having a distal end portion.

  The billet referred to in the present invention is mainly intended for billet billets having a thickness of 40 mm to 150 mm, a width of 75 mm to 350 mm, a length of 650 mm to 2500 mm, and a weight of 15 kg to 1000 kg. The features of the present invention will be described. At the extraction end of the pusher-type billet furnace, the billets on the heated skid rail are in contact with each other on the guide slope by the pusher. At that time, a component force of its own weight is directed to the charging side in the steel piece row on the upwardly-sloped guide slope. Aiming at the point where the steel piece at the extraction end crosses the top of the guide slope, the lifting tool is raised, the tip part pushes up the first steel piece, cuts off the subsequent steel piece, and then the pusher is activated. The steel slab group is pushed out by 1 pitch, and the leading steel slab is dropped to the discharge chute.

  With this configuration, when the leading and subsequent steel pieces are welded to each other on the side surface, the leading steel piece is lifted or tilted by a lifting tool, and the subsequent steel pieces have a force to pull back to the loading side. Because it works, it is easy to separate the welds between the steel pieces, and then only the top steel piece can fall to the discharge chute side by the operation of the pusher, and the two steel pieces will not fall down while being welded. . Moreover, since the raising / lowering tool pushes up a steel piece for every discharge | emission, it can discharge | release a steel piece one by one reliably.

The pusher type billet heating furnace cutting device according to claim 3 is the pusher type billet heating furnace cutting device according to claim 2, further comprising a billet sensing device capable of detecting the position of the billet on the top of the guide slope. It is characterized by that.

In this configuration, a billet detection device is provided outside the furnace, the presence of the billet on the skid rail is observed through the hole in the furnace wall, and a detection signal is issued when the leading red-hot billet comes to a predetermined position on the extraction end. Is. This detection signal determines the timing for raising the lifting tool, and performs one lifting operation each time. That is, for each steel piece coming to the guide slope at the discharge end, if the position where the steel piece is pushed up with respect to the lifting tool which is a fixed point is set, the leading steel piece will be pushed up reliably. However, since the top steel piece can be reliably separated and easily dropped onto the discharge chute, the billet steel pieces can be reliably cut out one by one. In addition, for example, a transmissive photoelectron sensor (cold metal detector, commonly referred to as CMD) that can confirm the position based on the presence or absence of a red-hot steel slab can be used for the steel slab sensing device.

According to the pusher type billet heating furnace cutting device according to the first and second aspects of the present invention, the leading billet on the skid rail is surely secured, including the case where the billet in the heating furnace is welded. Can be cut out one by one. Moreover, since the surface of a steel piece does not become wrinkled also when cutting out, it leads to maintaining the quality of a final product. Further, it is possible to eliminate the work of separating the welded steel piece on the transport roller, and to eliminate equipment damage due to a collision at the furnace wall at the heating furnace outlet.

According to the pusher type billet heating furnace cutting device according to claim 3 according to the present invention, the position of the leading billet can be easily detected, and the leading billet can be reliably cut by the lifting tool. Even so, it is possible to stably and reliably perform the cutting work for each steel piece.

According to the pusher type billet heating furnace cutting device according to claims 1 to 3 of the present invention, a simple device can be applied to any heating furnace regardless of size. In addition, it is possible to maintain and improve the operating rate of the rolling equipment. In addition, this contributes to productivity and energy saving in the rolling process, and it is possible to maintain and improve product quality. Moreover, since it is a simple apparatus, installation is easy and an installation cost and a maintenance cost do not become excessive.

FIG. 1 is a schematic layout diagram of a cutting device for a pusher-type billet heating furnace according to an embodiment for carrying out the present invention. Fig.2 (a) is a typical longitudinal cross-sectional view of the cutting device of FIG. FIG.2 (b) is typical sectional drawing of the AA arrow of FIG. 2a. Fig.3 (a) is an explanatory drawing which shows the operating state of the lifting tool at the time of cutting out a billet steel piece, which is a cutting device for a pusher type steel piece heating furnace according to the present invention. FIG.3 (b) is explanatory drawing which shows the state which the action | operation of the raising / lowering tool at the time of billet steel piece cutting out complete | finished, and pushes out with a pusher. Fig.4 (a) is an explanatory drawing which shows the operating state of the raising / lowering tool at the time of cutting out another shape billet steel slab, which is a cutting device for a pusher type slab heating furnace according to the present invention. FIG.4 (b) is explanatory drawing which shows the state which the operation | movement of the raising / lowering tool at the time of cutting out another shape billet steel piece ends, and pushes out with a pusher. FIG. 5 is a schematic layout of a conventional pusher-type billet heating furnace cutting device.

An embodiment for carrying out the pusher type billet heating furnace cutting apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic layout diagram of a cutting device for a pusher-type billet heating furnace according to an embodiment for carrying out the present invention. Fig.2 (a) is a typical longitudinal cross-sectional view of the cutting device of FIG. FIG.2 (b) is typical sectional drawing of the AA arrow of FIG. 2a. Fig.3 (a) is an explanatory drawing which shows the operating state of the lifting tool at the time of cutting out a billet steel piece, which is a cutting device for a pusher type steel piece heating furnace according to the present invention. FIG.3 (b) is explanatory drawing which shows the state which the action | operation of the raising / lowering tool at the time of billet steel piece cutting out complete | finished, and pushes out with a pusher. Fig.4 (a) is an explanatory drawing which shows the operating state of the raising / lowering tool at the time of cutting out another shape billet steel slab, which is a cutting device for a pusher type slab heating furnace according to the present invention. FIG.4 (b) is explanatory drawing which shows the state which the operation | movement of the raising / lowering tool at the time of cutting out another shape billet steel piece ends, and pushes out with a pusher.

The pusher type slab heating furnace 20 according to the present invention includes a billet slab 10 at a predetermined temperature suitable for rolling in order to further roll the continuously cast or rough rolled billet slab 10 in a rolling process in a rolling mill. It is the heating furnace 20 which reheats. The shape of the billet billet 10 is usually a billet having a thickness of 40 mm to 150 mm, a width of 75 mm to 350 mm, and a length of 650 mm to 2500 mm, and the weight ranges from 15 kg to 1000 kg. In the pusher-type billet heating furnace 20, the fixed skid rails 11 composed of a plurality of rows are arranged over the entire length. Then, the billet steel piece 10 is placed over the entire length of the fixed skid rail 11 so as to be positioned in parallel with the pusher (not shown) of the charging portion in contact with the traveling direction and pushed toward the extraction side. . The billet steel pieces 10 are heated by a burner (not shown) to rise or maintain a predetermined temperature. The pusher-type billet heating furnace 20 is charged with billet billets 10 by a pusher in a loading section, and extrudes a set of billet billets 10 and a plurality of billets heated by an extraction section. A cutting device 1 for taking out the steel pieces 10 one by one is installed.

As shown in FIGS. 1, 2, 3, and 4, the cutting device 1 according to the present invention is placed on the upper surface of the extraction end of the skid rail 11 and has a rail-shaped guide that exhibits an upward slope. In the middle of the slope 13 and the rail-like discharge chute 14 that drops and guides the billet steel piece 10 onto the conveying roller 15 from the top of the guide slope 13 and the adjacent skid rail 11, the top of the guide slope 13 is slightly in the traveling direction. A lifting tool 3 having a tip cap 3-1 that is positioned forward and positioned lower than the surface of the guide slope 13 in the standby position and protrudes higher than the surface of the guide slope 13 and lifts the steel piece when ascending. And a lifting device 2 that moves up and down. In addition, the skid rail 11 is normally provided with a metal skid on which a steel piece 10 slides at the upper part of a water-cooled box or water-cooled tube with a refractory, and the guide slope 13 has a similar structure.

As an example, the arrangement of the fixed skid rail 11 in the pusher-type billet heating furnace 20 for a billet billet 10 having a thickness of 40 mm to 150 mm, a width of 75 mm to 350 mm, and a length of 650 mm to 2500 mm is shown in FIG. Thus, it is possible to place billet steel pieces 10 having a length of 650 mm to 2000 mm with three rows of fixed skid rails 11 in which the interval between adjacent fixed skid rails 11 is 300 mm, and a length of 2500 mm. The billet billet 10 can be handled by arranging three rows of fixed skid rails 11 in two rows at a center interval of 2100 mm, that is, three rows of billet billets 10 having a length of 650 mm to 2500 mm. It can be mounted on two rows of fixed skid rails 11. Accordingly, one set of lifting device 2 having two lifting tools 3 is arranged for one set of three rows of fixed skid rails 11.

The lifting device 2 includes two sets of lifting tools 3 provided with a tip cap 3-1 that pushes up the steel piece 10, a pair of lifting body bodies 4-1 coupled at the bottom and the top surface of the two lifting tools 3, And two sets of fluid pressure cylinders 5 for raising and lowering the elevating body body 4-1.

The elevating body 4 includes an elevating body main body 4-1 having an inclined plate 4-4 and a plurality of guide rollers 4-2, a guide rail 4-3 that engages with the guide roller 4-2, and its support column. The A plurality of guide rollers 4-2 are provided on each side surface of the lifting body main body 4-1, and a guide rail 4-3 for vertically moving the plurality of guide rollers 4-2 in the vertical direction and a support column of the guide rail 4-3. Establish from. That is, two guide rails 4-3 are disposed on the side of the lift body 4-1 opposite to the fluid pressure cylinder 5, and one guide rail 4-3 is disposed on the fluid pressure cylinder 5 side. Is disposed in the middle of the two fluid pressure cylinders 5. In addition, guide rails 4-3 are disposed on both side surfaces of the lifting body main body 4-1 in the direction intersecting with the skid rails 11, respectively. Corresponding to the five guide rails 4-3, ten guide rollers 4-2 are arranged above and below each side portion of the lifting body main body 4-1.

The lower surface of the lift body 4-1 corresponds to the push roller 5-2 at the tip of the cylinder rod 5-1 of the two sets of fluid pressure cylinders 5, and is an inclined surface that is in pressure contact with each push roller 5-2. Two sets of the inclined plates 4-4 having the above are joined. When the push-up roller 5-2 is pushed into the inclined surface of the inclined plate 4-4 by the fluid pressure cylinder 5, the elevator body 4-1 is raised to a predetermined position in the vertical direction and the elevator 3 is also raised. And push up the first billet steel piece 10-1. On the contrary, when the push-up roller 5-2 is retracted, the lifting tool 3 and the lifting body body 4-1 are both lowered to a predetermined position by the weights of the lifting tool 3 and the lifting body body 4-1. The fluid pressure cylinder 5 is driven by air pressure or oil pressure. The driving force and driving speed of the cylinder rod 5-1 of the fluid pressure cylinder 5 can be adjusted by the fluid pressure and fluid flow supplied to the fluid cylinder 5. Thereby, the raising pressurization force and raising / lowering speed of the raising / lowering tool 3 can also be adjusted. In addition, by adopting the fluid pressure cylinder 5, a constant force can be applied to the lifting tool 3 regardless of the stroke, and an excessive force is applied so that the equipment of the lifting device 2 is not damaged.

As shown in FIGS. 2, 3, and 4, the lifting / lowering tool 3 includes a tip cap 3-1 made of a wear-resistant and heat-resistant metal that pushes up and contacts the leading billet steel piece 10-1 at the tip. . The main body of the lifting / lowering tool 3 is composed of a double pipe with the cooling water outflow pipe 3-3 disposed outside the cooling water inflow pipe 3-2, and the cooling water inflow pipe 3-2 is the tip of the double pipe. The tip cap 3-1 can be intensively cooled by focusing on the tip cap 3-1. In the lower part of the lifting / lowering tool 3, a cooling water inlet hose 3-4 is connected to the lower end of the cooling water inflow pipe 3-2, while the lower end of the cooling water outflow pipe 3-3 is drainage provided in the lifting body main body 4-1. It couple | bonds with the pipe | tube 4-5 and is discharged | emitted out of the system. By taking this configuration, it is possible to prevent damage due to radiant heat from the heating furnace 20 and the steel slab 10, and it is possible to prevent the lifting tool 3 when the steel slab 10 is pushed up from being bent or buckled by the reaction force. Further, since the metal tip cap 3-1 is provided, deformation can be prevented even if the steel piece 10 is frequently contacted, and the steel piece 10 is not excessively wrinkled. Moreover, it is also possible to give the shape of the metal tip cap 3-1 to a shape that can easily separate the steel piece 10 and to make it fall, for example, a gradient.

Further, since the passage of the lifting / lowering tool 3 communicates with the inside of the pusher-type heating furnace 20, a guide tube in which the lifting / lowering tool 3 moves up and down is provided, and a seal portion 6 having a conical tubular shape whose rear portion is widened is provided. The lower end of the part 6 is provided with a regular water seal (not shown) on the upper part of the lifting body main body 4-1. With this configuration, the heating furnace 20 is normally operated in a slightly negative pressure inside the furnace, so that even if the lifting / lowering tool 3 performs the lifting / lowering operation, the outside air enters the furnace by the seal portion 6 and the water seal portion. This prevents the heating efficiency of the heating furnace 20 from decreasing. Moreover, the surface oxidation of the billet billet 10 is also prevented, the quality of the billet surface is maintained and the yield is prevented, and further, the iron oxide film is welded by oxidation, that is, the fusion of the surfaces of the billets 10 is prevented. .

When raising and lowering the lifting tool 3 and cutting out the billet steel pieces 10 one by one, the lifting tool 3 is measured in anticipation of the relative position of the lifting tool 3 and the steel piece 10 reaching a predetermined position. The timing must be raised. Therefore, in the cutting device 1 of the pusher type slab heating furnace according to the present invention, the slab sensing device 7 capable of detecting the position of the leading slab 10-1 at the top of the guide slope 13 is provided. The billet detecting device 7 distinguishes between the red-hot billet 10 and the inside of the furnace 20 including the furnace wall 21, detects and detects the position of the red-hot billet 10, and specifies the position of the billet 10. A transmission type photoelectric sensor (CMD) 7-1 is used. That is, a transmission photoelectric sensor (CMD) 7-1 is provided outside the furnace, the steel piece 10 on the skid rail 11 is observed through the furnace wall hole, and the leading red hot steel piece 10-1 is placed at a predetermined position of the extraction end. A detection signal is issued when the signal comes. The timing for raising the lifting tool 3 is determined by this detection signal, and one lifting operation is performed each time. That is, for each steel piece 10 coming to the guide slope 13 at the discharge end, if the position where the leading steel piece 10-1 is pushed up with respect to the fixed point of the lifting tool 3 is set, the leading steel piece 10-1 is reliably pushed up. Therefore, even the welded leading steel piece 10-1 can be reliably separated from the leading steel piece 10-1 and then pushed out by the operation of the pusher and placed on the conveying roller 15 via the discharge chute 14. Therefore, the billet steel piece 10 can be cut out reliably.

The situation where the welded billet steel pieces 10 are separated from each other by the lifting tool 3 will be described with reference to FIGS. The cross-sectional shape of the billet steel piece 10 in FIG. 3 is substantially square, whereas in the case of FIG. 4, it is a rectangle that is long in the traveling direction. This cross-sectional shape often depends on the shape of a processed product such as rolling in a subsequent process. 3a and 4a show a state immediately before the lifting tool 3 pushes up the leading steel piece 10-1. The steel piece 10 group intermittently travels on the upper surfaces of the skid rail 11 and the guide slope 13 by pushing out a pusher (not shown) that operates intermittently at the charging end. The upper surface of the guide slope 13 is connected to the upper surface of the skid rail 11 at the outlet end, and has an upward slope in the traveling direction f of the steel piece 10. Due to this gradient, the steel slab 10 on the upper surface of the slope 13 is subjected to the component force of the steel slab 10 returning to the direction opposite to the traveling direction f.

3a and 4a, when the lower end of the steel piece 10-1 is pushed up by the stroke d of the lifting / lowering tool 3 with the tip cap 3-1 of the lifting / lowering tool 3, the leading steel piece 10-1 is lifted and the subsequent steel piece 10 and Separate the gaps. In addition, a force opposite to the traveling direction is applied to the subsequent steel piece 10, and as a result, the leading steel piece 10-1 is easily lifted by the lifting / lowering tool 3, so that the subsequent steel piece 10 is separated from the subsequent steel piece 10. Making it easy. Next, as shown in FIGS. 3b and 4b, when the lifting / lowering tool 3 descends and returns to the standby position, the pusher is actuated to intermittently extrude the steel slab 10 group, and the separated top steel slab 10-1 is separated. Only the toner is transferred onto the conveying roller 15 via the discharge chute 14. Therefore, the cutting device according to the present invention can sufficiently cope with any steel piece having a typical cross-sectional shape.

In summary, if the steel piece sensing device 7 detects that the leading steel piece 10-1 has reached a predetermined position of the guide slope 13, the detection signal is a trigger for starting the operation of the fluid pressure cylinder 5 of the lifting device 4. Become. The push-up roller 5-2 of the fluid pressure cylinder 5 pushes up the inclined plate 4-4 of the lifting body 4, and as a result, the lifting tool 3 is lifted by the stroke d and pushes the steel piece 10-1 higher than the guide slope 13 surface. Then, it is possible to forcibly separate from the subsequent steel piece 10. Next, the rising end is detected, the fluid pressure cylinder 5 is reversely operated, the lifting body 4 and the lifting tool 3 are lowered, and one cycle of the lifting action of the lifting tool 3 is completed. When the lifting / lowering tool 3 returns to the normal standby state, the pusher is operated to push out the steel slab 10 group, and the separated top steel slab 10-1 is dropped onto the discharge chute 14. Therefore, it is preferable to operate the detection signal of the steel piece 10-1, the lifting / lowering operation of the lifting / lowering tool 3, and the intermittent operation of the pusher in the insertion portion in conjunction with each other.

It can be used for cutting out heat-treated products in industrial heating furnaces.

1: Cutting device
2: Lifting device 3: Lifting tool 3-1: Tip cap
3-2: Cooling water inflow pipe 3-3: Cooling water outflow pipe 3-4: Cooling water inlet hose 4 Elevating body 4-1: Elevating body main body 4-2: Guide roller 4-3: Guide rail 4-4: Inclination Plate 4-5: Drain pipe 5: Fluid pressure cylinder 5-1: Cylinder rod 5-2: Push-up roller 6: Seal part 7: Steel piece detection device 7-1: Infrared sensor 10: Billet steel piece 10-1: Lead Billet 11: Skid rail 13: Guide slope 14: Discharge chute 15: Transport roller 20: Pusher type billet heating furnace 21: Heating furnace wall 22: Exit door d: Stroke of lifting tool f: Billet traveling direction

Claims (3)

In a cutting device attached to a pusher-type billet heating furnace and transferring a plurality of steel pieces mounted on a plurality of skid rails one by one onto a conveying roller located in front of the skid rail in the furnace, In the skid rail extraction section, a pusher type slab heating furnace cutting device comprising a lifting tool for pushing up a leading steel slab at an intermediate part between adjacent skid rails. In a cutting device attached to a pusher-type billet heating furnace and transferring a plurality of steel pieces mounted on a plurality of skid rails one by one onto a conveying roller located in front of the skid rail in the furnace, A rail-shaped guide slope that has an upward slope connected to the upper surface of the front end of the skid rail, a rail-shaped discharge chute that is guided from the top of the guide slope onto the conveying roller, and a guide slope between the adjacent skid rails. A lifting device provided with a lifting tool having a steel piece protruding tip that is located slightly above the top and positioned lower than the guide slope surface in the standby position and protrudes higher than the guide slope surface when ascending. The cutting device for a pusher-type billet heating furnace according to claim 1. The apparatus for cutting out a pusher-type billet heating furnace according to claim 2, further comprising a billet sensing device capable of detecting a position of a billet at the top of the guide slope.

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