JPH04224615A - Method for supporting furnace body in converter and method for exchanging furnace body - Google Patents

Abstract

PURPOSE:To support and exchange a furnace body of a converter quickly, safely, and efficiently at a low equipping cost without damaging the furnace body. CONSTITUTION:In the supporting and exchanging method for the furnace body in the converter, the furnace body supporting members 8 is provided to trunnion shafts 2, 3 arranged independently at the right and left sides and also at least one side of the trunnion shafts is made to shiftable to right and left directions, and the furnace body is held with the above supporting members 8 to hold the furnace body 1. At the time of exchanging the furnace body 1, a transporting carriage 23 is set below the furnace and the trunnion shaft is shifted under condition of supporting the furnace body with a lifting device 26 to release holding the furnace body between and the furnace body is quickly exchanged.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supporting a converter body and a method for replacing the furnace body.

0002

[Prior Art] A conventional method for supporting a converter body is to insert a converter fitted with a fixed flange into a trunnion ring.
Fixing with cotters or bolts is commonly used. As a method for replacing the furnace body of a converter supported via a trunnion ring, for example, Japanese Patent Application Laid-Open No. 48
Some of these are disclosed in Japanese Patent Application Laid-open No. 99008, Japanese Patent Application Laid-Open No. 148108-1982, and Japanese Patent Application Laid-open No. 13514-1982.

[0003] In the method disclosed in Japanese Patent Application Laid-Open No. 48-99008, a means for raising and lowering the furnace body is provided on a trunnion ring installed on a pedestal, and the furnace body in an inverted arrangement is coaxially suspended, and the above-mentioned trunnion ring The furnace body is inserted into and removed from the bottom opening of the furnace. In addition, what is shown in Japanese Patent Application Laid-Open No. 54-148108 is a system in which the ancillary equipment and the trunnion bearing upper casing of a replacement converter body are removed and attached to a moving means carried under the converter body. The converter unit (including the furnace body, trunnion ring, trunnion, and supporting device for the furnace body and trunnion ring) is supported by a support that can be raised and lowered, and the unit is further supported so that the lower end of the trunnion touches the trunnion bearing lower casing. After raising the object to a point above the furnace, the moving means is moved to a position in front of the furnace where the object can be lifted by an overhead crane, and from that position, the object is transferred to a predetermined position by an overhead crane. The prepared new converter unit is installed at the replacement location by the reverse process to that described above.

[0004] Furthermore, Japanese Unexamined Patent Publication No. 13514/1983 discloses a jack in which an elevating frame is installed between the front and rear frames that run together, and both front and rear ends of this elevating frame are disposed on the front and rear frames. The lifting frame is connected to the lower end of the downward rod so that the lifting frame can be raised and lowered along the front and rear frames by the operation of the jack, and furthermore, a swing frame is disposed on the lifting frame so as to be freely rotatable in the horizontal direction. The furnace body of the converter is replaced using a converter replacement trolley which is provided with a furnace body receiving shift frame.

[0005]

[Problems to be Solved by the Invention] However, in the conventional converter body support method described above, the top and bottom of the trunnion ring into which the furnace body is inserted are fixed by fixing flanges provided on the furnace body. The heat and load of the furnace body tends to cause deformation and cracks in the furnace shell. Further, there was a problem in that the cotter support claws could not be easily inserted or removed due to heat.

Furthermore, according to the converter body replacement method disclosed in Japanese Patent Laid-Open No. 48-99008, it is easy to extract the furnace body from the trunnion ring. however,
Repair work such as replacing the bricks inside the converter cannot be carried out if the converter remains upside down, so it is necessary to stand the converter upright, which poses the problem of requiring large-scale equipment to stand it upright. Ta. Furthermore, since the new furnace was installed upside down at the time of replacement, there was a problem in that there was a risk that the bricks inside the furnace would fall.

[0007] In addition, in the converter body replacement method disclosed in JP-A-54-148108, in the case of a large-sized converter, the weight of the entire converter becomes large, and supports to support it are required. There was a problem that equipment costs such as these had to be expensive. On the other hand, when replacing the converter body using the converter replacement cart disclosed in JP-A No. 62-13514, the cart is a device for rotating the furnace body on an elevating frame. However, there were problems in that the structure was complicated and large, and the equipment cost was high.

[0008]The present invention has been made by focusing on the above-mentioned problems of the conventional art, and it is possible to avoid deformation or cracking of the furnace shell due to the heat and load of the furnace body, and to prevent the furnace body from deforming or cracking even at high temperatures. It is an object of the present invention to provide a converter furnace body support method that is easy to replace, and a safe and quick converter furnace body replacement method adapted to the furnace body support method.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the method for supporting the furnace body of a converter according to the present invention includes providing support members for holding the furnace body at each tip of the left and right trunnion shafts, and At least one of them is movable left and right, and the furnace body is held between the supporting members. In the method for supporting a converter body, upper and lower constricted portions of the furnace body may be held between the supporting members.

[0010] Furthermore, the support member may have at least two holding portion ends spaced apart in the circumferential direction of the furnace body to sandwich the furnace body. The method for replacing the furnace body of a converter according to the present invention includes disposing a traveling carriage under the furnace, which includes a lifting device for raising and lowering the furnace body, and a traversing truck that is on the lifting device and moves the furnace body laterally, After the furnace body supported by the above furnace body support method is supported by the lifting device via the traversing truck, the trunnion shaft is moved to release the clamping of the furnace body by the support member, and then the traversing truck is moved laterally, After that, the elevating device is lowered to replace the furnace body.

[0011]

[Operation] According to the method for supporting the furnace body of a converter of the present invention, at least one of the left and right trunnion shafts provided with a support member at the tip is moved left and right, and the furnace body is supported by being sandwiched between the support members. , there is no need to fix the trunnion ring to the furnace body. Therefore, the furnace shell does not deform or crack due to repeated thermal stress applied to the furnace body, unlike in the case of conventional furnace support methods in which the furnace shell is restrained by flanges or trunnion rings. . Further, by simply retracting at least one of the trunnion shafts, the support of the furnace body by the supporting member can be quickly and easily released, regardless of whether the furnace body is heated or not. In order to support the furnace body again, it is sufficient to simply advance the retracted trunnion shaft toward the furnace body and hold the furnace body between the supporting members, making it possible to exchange the furnace body very quickly.

[0012] When the converter is relatively small, the structure of the apparatus can be simplified by sandwiching the vertically intermediate trunk of the furnace body with the support member. On the other hand, if the upper and lower constricted portions of the furnace body are held between the support members, more stable support is possible, and even a large converter can be supported. Furthermore, whether the upper and lower constricted parts of the furnace body are to be held together, or the furnace body trunk in between, a supporting member having at least two holding part ends spaced apart in the circumferential direction of the furnace body may be used. By sandwiching the furnace body, the supporting interval between the furnace bodies can be widened, and the stability of the furnace body is further improved.

When replacing the converter body supported by the above-mentioned support method, a traveling carriage is placed under the furnace, the elevating device is raised, and the bottom of the furnace body is placed on the traversing carriage to support it. In this state, if one of the trunnion shafts holding the furnace body is retracted, the furnace body is released from the grip and is supported on the traversing carriage while remaining upright. Next, when the traversing carriage is moved laterally in the retracting direction of the trunnion shaft or in the direction perpendicular to it, the engagement between the other support member and the furnace body is also completely released, and the furnace body becomes completely independent from the support member. Stand upright on the traversing trolley. Since the lifting device is lowered and the furnace body is taken out, it can be replaced without inverting or rotating the converter during the replacement process, and the equipment is simple, and repair work such as replacing the bricks inside the converter is also possible. It is safe and easy to do. Furthermore, since the new furnace can be installed in the upright position by performing the reverse process to the above, there is no risk of the bricks in the furnace falling, and safety is high.

[0014]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show a specific example of equipment for carrying out the method for supporting a converter body and the method for exchanging a furnace body of a converter according to the present invention. 1 in the figure is a converter furnace body having upper and lower constricted portions 1a and 1b. The converter body 1 is supported by a pair of trunnion shafts 2 and 3 on the left and right sides. The left trunnion shaft 2 on the left side in FIGS. 1 and 2 is rotatably supported by a drive part bearing 4 and installed on a foundation B, and is connected to the left trunnion shaft 2 via a drive part large gear 5 attached to the end. Rotationally driven. 7 is a rotary joint attached to the shaft end. A support member 8 is provided at the tip of the left trunnion shaft 2 to hold the converter body 1 . Support member 8 of this embodiment
A vertical arm 8a extends from the shaft end in the vertical direction of the converter body 1, an upper circumferential arm 8b extends from the upper end along the circumferential direction of the converter body 1, and an upper circumferential arm 8b extends from the lower end along the circumferential direction. It has an extended lower circumferential arm 8c. At the ends of the upper circumferential arm 8b and the lower circumferential arm 8c, holding portion ends 9 projecting toward the converter furnace body 1 are provided at intervals in the circumferential direction of the converter furnace body 1. ing. On the other hand, holding part end receiving members 10 corresponding to the holding part ends 9 are attached to the upper and lower drawing parts 1a and 1b of the converter furnace body 1 at a total of 8 locations, 4 locations each on the upper and lower sides. ing. This holding portion end receiving member 10 is
As shown in FIG. 3, two guide plates 10b are provided facing each other on a slide base 10a that is in close contact with the converter furnace body 1, and are fixed with bolts 10c. The holding portion ends 9 of the support member 8 are inserted between the two.

Like the left trunnion shaft 2, the right trunnion shaft 3 is also provided with a support member 8 at its tip, and is rotatably supported by a non-drive bearing 12 and mounted on the foundation B. Cylinder rods 14 of two trunnion shaft moving cylinders 13, which are left and right moving devices mounted on the foundation B, are connected to the outer surface of this non-driving bearing 12. Furthermore, a sliding guide plate 16 is interposed on the base 12a of the non-driving bearing 12 to smoothly slide the non-driving bearing 12 from side to side. On the other hand, on both sides of the foundation B, as shown in FIGS. 4 and 5, there are a pair of bearings in which a bearing fixing fitting 18 driven by a bearing fixing cylinder 17 is rotatably supported by a slide fixing pin 19. A fixing device 20 is attached, and the bearing fixing device 2 is normally
0 is driven to the fixed side, and the bearing fixing fitting 18 is moved to the bearing base 1.
2a to slide the non-drive bearing 12 onto the guide plate 1.
It is fixed on 6.

Below the converter furnace body 1 supported by the left trunnion shaft 2 and the right trunnion shaft 3, as shown in FIG.
A bogie rail 22 is laid, and a traveling bogie 23 running on the bogie rail 22 is arranged. This traveling carriage 23 is equipped with a furnace lifting device 26 consisting of a lifting cylinder 24 and a pedestal 25 that is driven up and down by the cylinder. A slide rail 27 is provided on the upper surface of the pedestal 25. A self-propelled transverse trolley 28 that moves left and right above is mounted.

Using the furnace body support and furnace body exchange equipment constructed as described above, the converter body support method and furnace body exchange method of the present invention will be explained. The converter furnace body 1 is supported as follows, and is replaced with a new furnace if necessary. That is,
The converter furnace body 1 has a holding portion end 9 at the tip of the support member 8 for both the right trunnion shaft 3, which has been moved to the left by the drive of the trunnion shaft moving cylinder 13, and the left trunnion shaft 2, which is opposed to the right trunnion shaft 3. It is supported by being sandwiched between. At this time, each holding part end 9 is connected to a holding part end receiving member 10 attached to the converter furnace body 1.
, respectively, and strongly presses the slide base 10a. Further, the base portion 12a of the non-drive bearing 12 that supports the right trunnion shaft 3 is clamped at the forward limit position on the sliding guide plate 16 by a bearing fixing fitting 18 of a bearing fixing device 20. Even if the converter furnace body 1 supported in this way is heated during operation and thermally expands in its radial and longitudinal directions (vertical direction), it will not be restrained as in the case of a conventional trunnion ring. . The holding end 9 holding the converter body 1 slides on the slide base 10a of the holding end receiving member 10 in the longitudinal direction to follow the thermal expansion of the converter body 1. As a result, there was no deformation or cracking of the steel shell of the converter furnace body 1, and repair costs and equipment failure time were drastically reduced.

The method for replacing the converter furnace body 1 is as follows. (2) Guide the traveling cart 23 and place it under the converter furnace body 1. Furnace lifting device 2 provided on the traveling trolley 23
The lifting cylinder 24 of 6 is driven to move the frame 25 to the traversing truck 2
8 and raise the bottom of the converter body 1 with the traversing cart 2.
8. Support on top. At this time, whether or not the converter furnace body 1 is supported can be determined by, for example, detecting the hydraulic pressure that pressurizes the lifting cylinder 24, or by attaching a load cell to the traversing truck 28 and detecting the load.

■ After confirming that the converter furnace body 1 is supported on the traversing carriage 28, the bearing fixing cylinder 17 of the bearing fixing device 20 is driven in the backward direction, and the bearing fixing fitting 18 is moved backward.
The clamp of the base 12a of the non-drive bearing 12 is released as shown in FIG. Next, the trunnion shaft moving cylinder 13 is driven to retract the cylinder rod 14. As a result, the non-driver bearing 12 slides onto the sliding guide plate 16.
At the same time, the right trunnion shaft 3 retreats together with the support member 8. The retreat distance is set to twice the protrusion length δ of the holding portion end 9 of the support member 8 plus α.

[0020] Thereafter, the traversing cart 28 supporting the bottom of the converter body 1 is made to run along the slide rail 27, and the end of the holding part is moved in the direction in which the right trunnion shaft 3 retreats (to the right in FIG. 2). 9 by the protrusion length δ+α. As a result, the holding end 9 of the support member 8 of the left trunnion shaft 2 also separates from the converter body 1, and the converter body 1 is completely released from being held by the support members 8 on both sides and interferes with the support member 8. It becomes possible to move without having to Thus, by simply retracting at least one of the trunnion shafts (in this example, the right trunnion shaft 3), the support member 8 can move the converter body 1 regardless of whether the converter body 1 is heated or not. Support can be released quickly and easily.

(2) Next, the lifting cylinder 24 of the furnace lifting device 26 on the traveling carriage 23 is driven to lower the pedestal 15 to a predetermined height. Thereafter, the converter furnace body 1 is carried out by guiding the running cart 23 out of the furnace along the cart rails 22. The new furnace body is carried to a position below the furnace by the traveling cart 23, and can be set in the reverse procedure to the above. At this time, the stopping position of the new furnace body lifted by the furnace body lifting device 26 is, as shown in FIG. Holding part end receiving member 10 attached to converter furnace body 1
By detecting the upper end surface with the height position detector 30, automatic and accurate control can be achieved.

As described above, in the converter body replacement method of this embodiment, only the converter furnace body 1 can be quickly extracted and replaced with a new furnace body, so the replacement time is significantly reduced compared to the conventional method. It was possible to shorten the time and improve productivity. In addition, the converter body 1 can be replaced simply by remote automatic operation, without requiring manual work at high places or high heat as in the past, without generating dust, and without the risk of falling metal. It was possible to implement it safely and quickly.

Furthermore, since the converter body 1 can be pulled out downwardly, there is no need to remove the converter body 1 or the front floor each time it is replaced, which improves work efficiency. 6 and 7 show other embodiments of a method for supporting the furnace body of a converter. In this embodiment, the converter body 1 has upper and lower constricted parts 1a and 1b.
Instead, the support member 8
This embodiment differs from the above embodiment in that it is held between the two. In the support structure used in this furnace support method, the support members 8 provided at the tips of the left trunnion shaft 2 and the right trunnion shaft 3 have an arcuate shape that can be closely attached to the cylindrical body 1c of the converter furnace body 1. It is plate-shaped and has a support surface 81 formed in the shape of a plate. By holding the middle body portion 1c of the furnace body 1 with such a simple support member 8, there is an advantage that the structure of the device can be simplified and the equipment cost can be reduced.

FIG. 8 shows still another embodiment of the support member 8 used in the method for supporting the converter body of the present invention. The support member 8 of this embodiment is the same as the converter body 1 of the second embodiment.
The cylindrical body portion 1c of the converter body 1 is held between the two holding portion ends 91 which are spaced apart in the circumferential direction of the converter furnace body 1, instead of being held with the supporting surfaces 81 formed in an arc shape in close contact with each other. The difference is that they are held in close contact. In this way, there is an advantage that the support interval of the converter furnace body 1 in the circumferential direction can be widened, and the stability of the converter furnace body 1 is further improved.

In each of the above embodiments, the actuator for moving the right trunnion shaft 3 from side to side, the bearing fixing device 2
Although a hydraulic or pneumatic fluid cylinder is used as the actuator for operating the bearing fixture 18 of 0 and as the actuator for raising and lowering the furnace body lifting device 26,
An electric motor, an electromagnetic actuator, etc. may also be used. Further, in each of the above embodiments, a case has been described in which only one of the left and right trunnion shafts (the right trunnion shaft 3) is moved left and right, but the present invention is not limited to this. may be moved.

In the first embodiment, after retracting the right trunnion shaft 3, the converter body 1 is laterally moved in the same direction by the traversing cart 28, and the converter body 1 and the support are moved horizontally in the same direction. Although a case has been described in which interference with the member 8 is avoided, for example, when the support member 8 is used in the case where the support member 8 is used as the body part 1 of the furnace body as shown in FIGS. 6 to 8,
If the vertical dimension (height) that holds the trunnion shaft is small, after the trunnion shaft retreats, the converter body 1 may be moved laterally in a direction perpendicular to the trunnion shaft (i.e., the transverse trolley 28 is perpendicular to the plane of the paper in FIG. 2). In this case, the stroke of the lifting cylinder 24 of the furnace body lifting device 26 only needs to be finely adjusted, and the equipment cost can be further reduced.

[0027]

Effects of the Invention As explained above, the method for supporting the converter body of the present invention includes providing a support member for holding the furnace body at each tip of the left and right trunnion shafts, and moving at least one of the trunnion shafts left and right. The furnace body is held between the supporting members. Therefore, there is no need to fix the trunnion ring to the furnace body, and as a result, it is possible to prevent deformation or cracking of the furnace shell due to thermal stress. Moreover, the effect that the support of the furnace body and the release of the support can be quickly and easily obtained regardless of the temperature of the furnace body.

In the method for replacing the furnace body of a converter according to the present invention, the furnace body supported by the above-mentioned furnace body support method is supported by an elevating device via a traversing truck, and then the trunnion shaft is retreated and the furnace body is replaced by a supporting member. The clamping of the furnace body was released, the traversing carriage was then moved laterally, and the lifting device was then lowered to replace the furnace body. Therefore, there is no need to invert or rotate the furnace body during the replacement process, and as a result, the replacement work can be done quickly, safely, and easily, and the replacement equipment can be provided simply and inexpensively.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an installation for carrying out the method of the invention.

FIG. 2 is a side view of FIG. 1.

FIG. 3 is a partial perspective view of an example of a support structure used in the furnace support method of the present invention.

FIG. 4 is a view taken along the line IV-IV in FIG. 2;

FIG. 5 is a perspective view of FIG. 4.

FIG. 6 is a perspective view illustrating a method for supporting a furnace body using another embodiment of the support member.

FIG. 7 is a plan view of FIG. 6.

FIG. 8 is a plan view illustrating a method for supporting a furnace body according to still another embodiment of the support member.

[Explanation of symbols]

1 Converter furnace body 2 Left trunnion shaft 3 Right trunnion shaft 8 Support member 9 End of holding part 10 Holding part end receiving member 23 Traveling trolley 26 Furnace lifting device 28 Traverse trolley

Claims (4)

[Claims] 1. A support member for holding the furnace body is provided at each tip of the left and right trunnion shafts, at least one of the trunnion shafts is movable left and right, and the furnace body is held between the support members. Converter furnace body support method. 2. The method for supporting a furnace body of a converter according to claim 1, wherein the upper and lower constricted portions of the furnace body are sandwiched between supporting members. 3. In the method for supporting a converter body according to claim 1 or 2, the support member has at least two holding portion ends spaced apart in a circumferential direction of the furnace body to sandwich the furnace body. Converter furnace body support method. 4. The furnace according to claim 1, wherein a traveling carriage comprising an elevating device for elevating and lowering the furnace body and a traversing cart disposed on the elevating device and for moving the furnace body laterally is disposed below the furnace. After the furnace body supported by the body support method is supported by the lifting device via the traversing truck, the trunnion shaft is moved to release the furnace body from the support member, and then the traversing truck is moved laterally, Thereafter, the furnace body replacement method is characterized in that the elevating device is lowered to replace the furnace body.