RU2368664C2 - Transferring device for changing of hot runner - Google Patents

Abstract

FIELD: metallurgy. ^ SUBSTANCE: transferring for changing of hot runner of blast furnace provides transferring of hot runner between top exhaust level and low operating level. Device contains inclined bridge, implemented with ability of hot runner keeping in operation position before discharge opening of blast furnace and with ability of inclination for formation of inclined plane, by means of which hot runner can be lifted to top exhaust level or down to low operating level. ^ EFFECT: fast and safe transferring of very heavy hot runners between low and top levels on casting yard. ^ 16 cl, 7 dwg

Description

Field of Invention

The present invention relates to a moving device for replacing a gutter, in particular, to a main outlet trough of a cast iron blast furnace.

BACKGROUND OF THE INVENTION

At the foundry yard of the blast furnace, pig iron and cast iron slag are separated in the main outlet trough, which communicates with the outlet of the blast furnace. Such a main groove is lined with refractory lining, which needs to be periodically updated. The complete replacement of the refractory lining of the main trough usually takes at least one week, during which the corresponding outlet does not work. In order to reduce the idle time of the outlet, it is proposed to simply replace the main channel with a backup channel instead of replacing its refractory lining in place. However, the overall dimensions of the main trough of modern blast furnaces can be, for example, up to 20 m in length, 3 m in width and 2 m in height with a weight of up to 400 tons. Obviously, replacing the main gutter with a backup one causes serious movement problems.

To replace the main gutter, the use of a crane, which is usually available in the foundry, is provided. However, in order to lift the heavy main trough, the crane of the foundry yard and its supporting structures must be significantly strengthened, which is often very expensive and even impossible due to chronic lack of free space around the blast furnace. In addition, the handling of heavy objects such as the main trough of a large blast furnace using a crane in a confined space causes serious safety problems.

EP 0279165 describes the use of a lifting device that includes vertical traction elements, which can be flexible or rigid and fixed on the platform at the outlet level or, alternatively, on the gutter, for lifting the main gutter vertically between the lower working level and the upper outlet level. A similar approach is described in patent DE 3624266. In accordance with this document, vertical lifting elements are located at the lower level of the blast furnace production.

Although the lifting devices which are the prototypes described in EP 0279165 and DE 3624266 allow replacement of the main gutter, they require laborious and expensive vertical lifting means, which also carry a safety risk. This is especially true if the main gutter is very heavy and bulky.

The purpose of the invention

An object of the present invention is to provide an improved gutter replacement moving device that provides easy, quick and safe movement of very heavy gutters between a lower working level and an upper outlet level in a foundry.

DETAILED DESCRIPTION OF THE INVENTION

In accordance with the present invention, the goal is achieved by a moving device including a tiltable bridge configured to hold the gutter in position in front of the outlet of the blast furnace. This bridge can be inclined, forming an inclined plane along which the gutter rises or falls. In other words, the chute can be moved from the upper outlet level to the lower working level and vice versa by moving it along an inclined plane. This allows you to simply, quickly and safely replace very heavy gutters in the foundry. Sliding the gutter along the inclined bridge really requires significantly less effort than its vertical rise. Therefore, drive devices for moving a very heavy trough along an inclined plane can be simpler, less powerful and bulky, and also less expensive than lifting devices for vertically lifting the trough. Moreover, moving a large mass along an inclined plane is obviously safer than its vertical rise. An additional important advantage is that all the main elements of the moving device in accordance with the present invention can be located below the level of the exit platform. In other words, the transfer device in accordance with the present invention is not a bulky obstacle on or above the discharge platform.

A particularly compact and simple embodiment of the moving device includes a lower section of the bridge and an upper section of the bridge, individually tilted together to form an inclined plane.

Thus, the lower section of the bridge can be installed in a horizontal position, providing at the lower working level the replacement of the gutter located on this lower section of the bridge. The upper section of the bridge can be installed in the working position at the upper level of the discharge platform, in which the gutter installed on this upper section of the bridge can be operated in front of the outlet of the blast furnace.

To facilitate the movement of the gutter along the tiltable bridge, it is best to install the gutter on a support trolley for the gutter. Such a trolley is, for example, a rail vehicle, wherein the tiltable bridge includes rails for guiding the rail vehicle.

To ensure easy replacement of the support trolleys for the trough in the lower section of the bridge, it is preferable to arrange two working areas on both sides of the lower section of the bridge. For easy movement of the support trolley for the gutter from the lower section of the bridge in the transverse direction to one of these two working areas and vice versa, it is preferable to have wheels on the support trolley for the gutter, which are rotatable around a vertical axis.

Any kind of drive device may be used to move the cart along the tiltable bridge. In a preferred embodiment, the drive device includes a hydraulic lift. However, the drive device may, for example, also include a winch or a rack.

In a preferred embodiment, the tiltable bridge includes a lower section of the bridge and an upper section of the bridge that are individually and individually tilted to form an inclined plane, and the hydraulic lift includes a lift housing integrated in the lower section of the bridge and a telescopic lift piston, guided by a guiding device in the lower section of the bridge or in the upper section of the bridge.

In a preferred embodiment, the tiltable bridge tilts when rotated around at least one approximately horizontal axis, preferably by means of at least one hydraulic hoist. The latter advantageously includes at least one articulated support used as a support in a non-inclined position and / or in an inclined position.

And also to increase safety, the moving device mainly includes a locking device for attaching the gutter to the tilt bridge. The locking device has two functions. Firstly, it allows you to fix the gutter or the support trolley for the gutter in the working position in front of the outlet. Secondly, it serves to secure the gutter or the support trolley for the gutter in the upper section of the tilted bridge when it is in the tilted position. To prevent uncontrolled sliding of the gutter along an inclined plane, the locking device is advantageously designed so that it cannot be supported only after the corresponding drive device, for example a hydraulic elevator, has taken over the mass of the gutter or the support carriage for the gutter. In this preferred embodiment, the locking device includes an attached safety mechanism that allows the locking device to be released only if the clamping head of the hydraulic piston engages with the trolley that has taken up its working position in front of the outlet.

Brief Description of the Drawings

Other features and advantages of the invention will be shown in the following detailed description of a preferred embodiment with reference to the accompanying drawings. These drawings depict the following:

figure 1 is a view in section of a moving device in accordance with the invention, where the moving device supports the chute in a working horizontal position in front of the outlet of the blast furnace;

FIG. 2 is a sectional view of the moving device of FIG. 1 in a gutter replacement configuration when the gutter is in a raised position;

FIG. 3 is a sectional view of the moving device of FIG. 1 in a gutter replacement configuration when the gutter is in a lowered position;

figure 4 is a top view of the replacement zone of the trough of the moving device of figure 1 (see section along the line aa in figure 1);

5 is a sectional view of a replacement zone of the trough of the moving device of FIG. 1 (see section along line BB in FIG. 1);

6 is a vertical section of a locking device for the gutter; and

Fig.7 is a horizontal section of the locking device of Fig.6 (see section along the line CC in Fig.6).

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Figure 1 shows a cross-sectional view of the foundry yard of the blast furnace 10, on which there is an outlet 12, and the main groove 14 communicates with this outlet 12. Position 16 denotes the outlet of the foundry. The main groove 14 is shown at the level of the discharge platform 16 in the exhaust position under the outlet 12. The gutters for cast iron and slag (not shown) are located below and along the main groove 14 and are used to direct the cast iron (steel) to the ladles, and the slag to slag collectors or slag traps (not shown).

The moving device in accordance with the present invention is indicated by the common reference numeral 20. It includes a tilt bridge 26 consisting of a tilt first section of the bridge 24 and a tilt second section of the bridge 34. The first section of the bridge 24 is installed on the basement 44 of the foundry in front of the outlet 12. In FIG. 1, the tiltable first portion of the bridge 24 is shown in a horizontal configuration in which it supports the trough 14 in the outlet position in front of the outlet 12. In FIGS. 2 and 3, the tiltable first portion a bridge 24 is shown in an inclined runner replacement configuration. The second section of the bridge 34 is installed in the working basement 42 under the basement floor 44 of the foundry in axial alignment with the first section of the bridge 24. In FIG. 1, the tiltable second section of the bridge 34 is shown in a non-inclined horizontal configuration at the level of the working platform in the working basement 42. In FIG. 2 and 3, the tiltable second section of the bridge 34 is depicted in an inclined trough replacement configuration in which it interacts with the tiltable first section of the bridge 24, forming an inclined plane along which the trough 14 can be raised or lowered.

Reference numeral 22 denotes a support trolley for the trough supporting the main trough 14. This support trolley for the trough 22 is designed as a rail vehicle guided along rails 40 located on both sections of the bridge 24, 34. The locking device 28 allows the support trolley to be locked. 22 at the inlet end of the first section of the bridge 24. Position 32 indicates the second support trolley for the trough carrying the replaceable main trough 36. In FIG. 1, this second support trolley for the trough 32 is parked on a working platform in working basement 42 side along the lowered second section of the bridge 34.

In the following, the tiltable first section of the bridge 24 will be described in more detail. It includes a support track 46 for a support trolley for a trough 22. It should be noted that the support track 46 is significantly longer than the support trolley for the trough 22, which allows an elongated trough to be placed (not shown) below the main groove 14, when the latter is in the outlet position shown in figure 1. Reference numeral 58 indicates thermal insulation 58 protecting the lower surface of the support track 46 from thermal radiation in this outlet position. The end of the support track 46 closest to the outlet 12 is supported by a hinge post 50. The latter includes a first bracket 52 attached to the support track 46 and a second bracket 54 fixed to the base located at the site of the casting yard 44. Two brackets 52 , 54 are connected by an approximately horizontal rotary shaft 56, allowing the support track 46 to rotate around an approximately horizontal rotary shaft 56. A linear actuator, for example a hydraulic elevator 62, pivotally supported at one end onto a platform at 44 and pivotally connected at its other end to the support track 46, is used to rotate the support track 46 around the pivot shaft 56, thereby bringing the tilted first portion of the bridge 24 either into its horizontal outlet configuration or into its inclined trough replacement configuration. One or more of the pivot bearings 64 are supported on the base 65 on the platform 44, forming an additional support for the support track 46 in a horizontal position to unload the hydraulic lift 62 when the support track 46 is in its horizontal position. These supports 64 are rotatable around a hinge connected to a support track 46 and driven by hydraulic lifts 66. Comparing FIGS. 1 and 2, it is clearly seen how the inclined configuration of the first section of the bridge 24 is achieved by rotating the first group of supports 64 and retracting the first drive 62. It should be noted that in the inclined configuration of FIG. 2, the rear end of the support track 46 rests on the small supports 88 on the same bases 65 on which the longer supports 64 in the horizontal configuration are supported.

The tiltable second portion of the bridge 34 includes a support track 46 ′ cooperating in the replacement configuration of FIGS. 2 and 3 with the support track 46, forming a continuous inclined track leading from the outlet 12 to the working basement 42. The end of the support track 46 ′, the most remote from the outlet 12, rests on the hinge support 70 in the working basement 42 to rotate the support track 46 ′ about an approximately horizontal axis. A linear actuator, for example a hydraulic elevator 72, pivotally supported at one end to the platform of the working basement 42 and pivotally attached to the support track 46 ′ with its other end, is used to rotate the support track 46 ′ around the articulated support 70, thereby leading to a tiltable second a section of the bridge 34 either in its horizontal configuration shown in FIG. 1 or in its inclined configuration for replacing the chute shown in FIGS. 2 or 3. Just like the first section of the bridge 24, the second section of the bridge 24 is additionally equipped n one or more supports 90 with the possibility of their removal. These supports 90 support the support track 46 ′ in an inclined position so as to be able to unload the second drive 72 after lifting the support track 46 ′ into its inclined position.

Reference numeral 80 denotes a telescopic boom 80 used to move the trolley support trolley 22 (or 32) along an inclined plane defined by the support tracks 46, 46 ′ when the moving device 20 is in the trough replacement configuration shown in FIGS. 2 or 3 In the non-inclined configuration of FIG. 1, the retracted telescopic boom 80 is positioned inside the support track 46 ′. It should be noted that the hydraulic lift 62 is preferably a double-action lift for counteracting the torque exerted by the telescopic lift 80 on the hinge support 50. In fact, thus, the tensile force is applied by the drive 62 to the first portion 24 when the telescopic lift 80 pushes the trolley 22 This allows you to compensate for this point and prevent damage to the replacement device 20. As best shown in the enlarged fragment Z in figure 2, tel posed a microscopic jack 80 includes a carrier head 82, one acceding loose contact with a bracket 84 beneath the runner-supporting truck 22, to hold the carriage 22 in an inclined plane. The holder head 82 and the telescopic piston of the elevator 80 are equipped with guide wheels that guide and support the piston and the holder head 82 inside the guide rails of the support tracks 46, 46 ′. When the tilt bridge 26 is in the gutter replacement configuration shown in FIG. 2 and the locking device 28 is released, the trolley 22 supporting the gutter 14, which is being replaced, can be controlled to lower by means of a telescopic elevator 80.

Figure 3 shows the location after the downward movement of the trolley 22 along the tiltable bridge 26. This arrangement is achieved by fully retracting the telescopic boom 80. After that, the trolley 22 is completely held in the lower section of the bridge 34. When the supports 90 are removed, the second drive 72 can rotate the lower section bridge 34 in its horizontal position. The first trolley 22 supporting the worn trough 14 can be replaced by the second trolley 32 supporting the updated trough 36. This operation is performed on a working platform in basement 42.

Figure 4 shows a top view of the rails in the basement 42. Two horizontal zones 100 and 102 for parking and updating are made on both sides of the lower section of the bridge 34. The transverse rails 106 are perpendicular to the rails 40 of section 34 and are designed to allow easy removal of the first truck 22 with section 34 and placing on it a second carriage 32. To replace a simple draft of one of the carriages 22, 32, both carriages 22 and 32 can be rigidly engaged with each other on their sides. The numerals 108 indicate winches for such lateral movement of bogies. The transverse stops 110 are placed on some transverse rails 106 to limit the lateral movement of the bogies 22 and 32. The end stops 114 are located on the extensions of the rails 40 in the downward direction to limit the downward movement of the bogie 22, respectively, of the bogie 32. Figure 4 also shows vertical lifts 112, located along the lower section of the bridge 34 for lifting the cart 22 (respectively 32) from the rails 40, as described in the following paragraph.

Figure 5 shows a sectional view of the carts 22 and 32 in the basement 42. The carts 22 and 32 are in the basement 42 during the replacement operation. For lateral movement along the rails 106 shown in FIG. 4, each of the wheels 120 for moving the bogies 22 and 32 is mounted on brackets 122 that are rotatable about a vertical axis. To change the orientation of the running wheels 120 from the longitudinal direction (like the trolley 22 in FIG. 5) to the transverse direction (like the trolley 32 in FIG. 5) and vice versa, the trolley 22 or 32 respectively is lifted by means of vertical lifts 112. When the trolley 22 or 32, its running wheels 120 can be rotated 90 °, allowing a choice between longitudinal or lateral movements. The cart 22 or 32 is then lowered onto its running wheels 120, which lock the bracket 122 in the selected direction of travel. Figure 5 also shows the grooves 14, 36 installed in the carts 22 or 32 with a circumferential clearance 124. In fact, the grooves 14 or 36 are mounted on sliding plates or travel rods (not shown) inside the carts 22 and 32 and are attached to the latter only in one specific point (not shown) along the entire length. This type of installation allows thermal expansion of the gutters 14 or 36 during operation in front of the outlet 12.

5 also shows a sectional view of the structure of the lower section of the bridge 34. More specifically, the lower section of the bridge 34 includes two longitudinal parallel beams 130, for example two steel beams. The beams 130 are fastened along their length by a plurality of upper 132 and lower 134 cross members welded to the inner walls 136 of the beams 130. A space is provided between the beam 130 and the upper 132 and lower 134 cross members to extend the telescopic boom 80. The support wheels 92 for the hoist 80 are guided and supported by sections 138 attached to the inner sides of sections 24, 34. The rails 40 are welded to the beams 130 directly above their outer machines 140 for stability. The upper section of the bridge 24 has a similar design. It should be understood that this design makes it possible to obtain a strong, reliable and compact tiltable bridge 26.

When the trolley 22 supporting the replaced trough 14, which is replaced, is lifted and replaced by the trolley 32 supporting the updated trough 36 on the rails 40 of the lower portion of the bridge 34, the latter rises again to form the tilt bridge 26. Before lifting the trolley 34, the configuration becomes identical to that shown in FIG. 3 (except for the replaced trough and the replaced trolley). After the cart 32 is lifted by the telescopic elevator 80, the configuration shown in FIG. 2 with the corresponding changes is formed.

The return of the upper 22 and lower 34 sections of the bridge to the horizontal position is performed by the first 62 or, alternatively, the second drive 72, the supports 90 are previously removed and then the supports 64 are set instead. When the operation of replacing the main groove 14 with the updated main groove 36 is completed, the configuration of the moving device 20 again corresponds to that shown in FIG. 1, except that the new updated trough 36 is in the working position in front of the outlet 12.

Returning to figures 1 and 2, it should be noted that the locking device 28 performs an important function. In fact, it secures the main channel 14 in front of the outlet 12 in the working position and the inability to move along the upper section of the bridge 24 when it tilts the support trolley for the channel 22 on the inclined bridge 26 in the configuration of the replacement channel.

FIG. 6 is a vertical sectional view of a preferred embodiment of the locking device 28, which includes a locking piston 200 sliding along a guide 202 with reinforced walls 204. In the locked position, as shown in FIG. 6, the locking piston 200 is engaged with the clamp ring 206, which is located on the lowered element 208 of the support trolley for the chute 22 or 32. The mechanism for the moving device 28 is placed in the housing 210, firmly attached to the upper portion of the bridge 24, preferably near the outlet 12. This mechanism includes includes a hoist with a hydraulic drive 212 used to engage or disengage the locking piston 200 from the clamping ring 206 of the hoist. The drive hoist 212 is mounted on a support bracket 214 in the housing 210.

In Fig.7 depicts the locking device 28 of Fig.6 in horizontal section along the line CC in Fig.6. It can be seen that the moving device 28 includes an additional internal safety mechanism 216. More precisely, the mechanism 216 includes a safety collar 218 rotatably mounted on a hinge 220. The safety collar engages with a groove 222 of the locking piston 200 for fixing it, i.e. to ensure that the locking piston 200 cannot be accidentally removed from the mounting ring 206. The lever 224 typically holds the safety collar 218 in the groove 222 with a spring-loaded tension arising from the spring 226. Pre the storage collar is disengaged by the cam 228 acting on the follower 230 provided on the safety collar 218 from the side facing section 24. The cam 228 is mounted on the head-holder 82 of the telescopic boom 80. It is preferable that the two devices 28 are placed symmetrically on both sides of the upper section of the bridge 24 (with their equipment on the carts 22, 32, section 24 and the head-holder 82). It should be understood that the locking piston 200 can only release the cart 22 or 32 when the holding head 82 is present, that is, when the telescopic boom 80 is able to hold the cart 22 or 32, respectively.

It should be added that limit switches are provided for added safety, preferably on all movable elements or motors of the moving device to replace the chute 20. Such elements, in particular, are sections of the bridge 24 and 34, head-holder 82, locking device 28, supports 64 and 90, vertical lifts 112, winches 108 and drives 62, 72. In the case of a telescopic elevator 80, limit switches are preferably provided for each element and allow, in this case, to be constantly controlled its retraction / extension speed.

Claims (16)

1. A movable device for replacing the gutter of a blast furnace, comprising a device (20) for replacing the gutter by moving it between the upper outlet level (16) and the lower working level (42), characterized in that the device (20) contains a tilt bridge (26) configured to hold the chute (14) in working position in front of the outlet (12) of the blast furnace (10) and tilted to form an inclined plane along which the chute (14) can be raised to the upper outlet level (16) or lowered to the lower working level (42). 2. The device according to claim 1, characterized in that the tilt bridge (26) comprises a lower section (34) and an upper section (24), individually tilted between the tilted position to replace the trough (14) and the non-inclined position and with the ability to line up in their inclined positions and form an inclined plane for the movement of the gutter when it is replaced. 3. The device according to claim 2, characterized in that the lower section (34) of the bridge is supported at an end remote from the outlet (12) with the possibility of rotation around an approximately horizontal axis between an inclined position to replace the gutter and a non-inclined position to hold the gutter on the lower working level (42), which allows the replacement of the gutter (14) installed on the lower section (34) of the bridge. 4. The device according to claim 3, characterized in that the upper portion (24) of the bridge is supported at an end remote from the outlet (12) with the possibility of rotation around an approximately horizontal axis between an inclined position to replace the gutter and a non-inclined position to hold the gutter on the upper outlet level (16), in which the trough (14) is installed on the upper section (24) of the bridge with the possibility of its location in front of the outlet (12) of the blast furnace (10). 5. The device according to any one of claims 1 to 4, characterized in that it is equipped with a trolley (22), configured to hold the gutter (14) and move along the tilt bridge (26). 6. The device according to claim 5, characterized in that the trolley (22) is made in the form of a rail vehicle, and the tilt bridge (26) is made with rails (40) for moving the vehicle along the tilt bridge (26). 7. The device according to claim 5, characterized in that the trolley (22) contains wheels (120) mounted on brackets (122) and configured to rotate around a vertical axis to change the orientation of the direction of the wheels (120) from the longitudinal direction to the transverse direction , to move the cart (22) in the transverse direction in the working area (100, 102), located on both sides of the tilt bridge (26) at the lower working level (42). 8. The device according to claim 5, characterized in that it is equipped with a drive configured to move the cart (22) along the tiltable bridge (26). 9. The device according to claim 8, characterized in that the drive is made in the form of a hydraulic lift (80). 10. The device according to claim 9, characterized in that the tilt bridge (26) contains the lower section (34) and the upper section (24), configured to tilt individually or together to form an inclined plane, and the hydraulic lift (80) contains a lift body integrated in the lower section of the bridge (34) and a telescopic piston interacting with guiding devices (92, 138) located in the lower section (34) and in the upper section (24) of the bridge (26). 11. Device according to any one of claims 1 to 4, characterized in that it is provided with at least one hydraulic hoist (72) for tilting the tiltable bridge (26) by turning it around at least one approximately horizontal axis. 12. The device according to claim 11, characterized in that it is provided with at least one articulated support (64, 90) used as a support for the tilt bridge (26) in the non-inclined position and / or in the inclined position. 13. The device according to any one of claims 1 to 4, characterized in that it is equipped with a trolley (22) made to hold the trough (14) and move along the tilt bridge (26), and a locking device (28) for securing the trolley ( 22) on the tiltable bridge (26) in the working position in front of the outlet (12). 14. The device according to item 13, characterized in that it is equipped with a hydraulic hoist (80) containing the head holder (82), engaged with the trolley (22) for the latter to move along the tiltable bridge (26), and a safety mechanism ( 216), comprising a fastening device with a locking device (28) for releasing the locking device (28) when the head-holder (82) engages with the carriage (22) in the working position in front of the outlet (12). 15. The use of a moving device according to any one of claims 1 to 14 for replacing the main trough of a blast furnace. 16. A device for replacing the trough of a blast furnace by moving it between the upper outlet level (16) and the lower working level (42), characterized in that it contains a tilt bridge (26) with an upper section (24) and a lower section (34), the upper section of the bridge (24) is supported on the end closest to the outlet (12) of the blast furnace (10) with the possibility of rotation around an approximately horizontal axis between the non-inclined position to hold the gutter (14) in the working position opposite the outlet (12) on the platform graduation level (16) and an inclined position for replacing the gutter, the lower portion of the bridge (34) is supported on an end remote from the outlet (12) that can rotate around an approximately horizontal axis between the non-inclined position to hold the gutter (14) at the working level (42) and the inclined position for replacing trough, and the lower section (34) and the upper section (24) of the bridge are arranged to line up in their inclined positions to replace the gutter and form a continuous inclined plane for moving the trough (14) between the upper outlet low level (16) and lower working level (42).

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