JPS6312127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metallurgical rotary furnace in which a furnace body is rotatably supported around a furnace shaft.

Generally, metallurgical converters are supported via a trunnion ring that surrounds approximately the middle portion of the furnace body. The trunnion ring has a pair of trunnion shafts, and the trunnion shafts are pivotally supported by bearing means installed on the foundation. Therefore, the furnace body is rotatable around the trunnion shaft and can be used for receiving, tapping, and
In addition to normal operations such as slag discharge, various steelmaking operations such as repairing refractories inside the furnace will be carried out. The attachment of the furnace body to the trunnion ring needs to be able to cope with thermal deformation of the furnace body, and in addition, it is necessary to rotate the furnace body around the furnace axis in order to simplify the repair work of the refractory in the furnace. .

In order to solve these problems, in addition to the Kaldor converter, techniques such as those disclosed in Japanese Patent Application Laid-Open No. 85618/1983 are already known. However, in these known technologies, the trunnion ring loads and supports not only the load of the furnace body but also all other functions and rotates, so the structure of the support and rotation means on the trunnion ring is complicated and large. There are some inconveniences such as

The present invention was made to solve these problems, and its features are as follows:
A U-shaped frame is fixedly installed that extends below the furnace body from the trunnion ring, and a bearing block is provided at the lower end of the frame.The bearing block rotatably supports the load of the furnace body in the axial direction. By providing a plurality of rotary support mechanisms and supporting the load in the radial direction of the furnace body with the rotary support mechanisms,
The point is that so-called load concentration and function concentration on the trunnion ring can be avoided.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a front view of the rotary furnace according to the present invention in an upright state, and FIG. 2 shows a view taken along the line shown in FIG. The furnace body 1 is shown in an erect state with the furnace axis X oriented vertically, and is supported by a trunnion ring 4 at a substantially middle part of the furnace body 1 so as to be spaced apart from the inner surface of the trunnion ring 4. A pair of trunnion shafts 5, 6 are protruded from the trunnion ring 4, and the trunnion shafts 5, 6 are supported by bearings 8 on a pedestal 7 so as to be tiltable about an axis Y.

A U-shaped frame 10 that extends below the furnace body 1 is integrally fixed to the trunnion ring 4 below.
A bearing block 12 is installed in the center of the U-shaped frame 10 on a thrust bearing part 11 having a structure described later.
A support plate 13 provided on the furnace bottom 3 and concentric with the furnace axis X is mounted to support the load of the furnace body 1 in the direction of the furnace axis X. Both the bearing block 12 and the support plate 13 on the bottom side of the hearth are provided with a key groove 14 as shown in FIG. FIG. 3 shows a fastening method using pins 17 and bolts 18 instead of the bolts and nuts 16 in FIG. 4.

On the upper and lower surfaces of the trunnion ring 4, lateral support devices 19 shown in FIGS. 2, 5, and 6 are provided at several locations on the circumference. This lateral support device 19 has levers 21, 21' pivoted to a pair of brackets 20, 20' attached to the trunnion ring 4, respectively.
2, 22' as a swing mechanism, lever 21,
Support rollers 23, 23' are pivotally supported at the inner ends of the levers 21', and a fluid pressure cylinder 25 is stretched between the outer ends of the pair of levers 21, 21' to form a roller pressure contact type. be done. By operating the fluid pressure cylinder 25 of the side support device 19, the support rollers 23, 23' are brought into pressure contact with the upper and lower rails 26, 27 provided on the furnace side of the furnace body 1, and the support rollers 23, 23' are brought into pressure contact with the upper and lower rails 26, 27 provided on the furnace side of the furnace body 1, and the radial direction of the furnace body 1 is Support the load. The load in the direction perpendicular to the furnace axis due to the tilting of the furnace body 1 is applied to the side support device 19 and the thrust bearing portion 1.
1, it is possible to support it in a well-balanced manner and without causing local overload.

FIG. 7 shows an example of the structure of the thrust bearing section 11. A central rotation shaft 28 extending downward from the bearing block 12 is supported by a combination of a thrust bearing 29 and a radial bearing 30 provided between the thrust bearing portion 11 and the thrust bearing 29 . A gear 30 is fitted to the central rotating shaft 28, and by rotating a pinion 32 that meshes with the gear 30 with a motor 33, the furnace body 1 connected thereto is rotated about the furnace axis X. This rotation is constantly guided by the support rollers 23, 23' of the side support device 19 and the rails 26, 27 of the furnace belly. 3
4 is a rotary joint through which cooling water and other refining materials can be supplied to or discharged from the rotating furnace body 1.

FIG. 8 shows another example of the structure of the thrust bearing section 11, in which the thrust bearing 29 and radial bearing 30 in FIG. 7 are replaced with a turntable bearing 35 that has both functions.

FIG. 9 shows yet another example of the structure of the thrust bearing part 11, which is applicable when the load in the direction of the furnace axis X is light, and the turntable bearing 35 is attached to the bush 36. has been replaced.

The rotational drive of the furnace body 1 around the furnace axis
As shown in FIGS. 8 and 9, the central drive device is not limited to the central drive device built into the thrust bearing 11 at the bottom of the furnace, but as shown in FIG. pinion 3
It is also possible to use a peripheral drive device in combination with 8.
In this case, the thrust bearing part 11 is connected to the furnace axis X of the furnace body 1.
It is only necessary to rotationally support the load in the direction.

Furthermore, the connection between the U-shaped frame 10 and the furnace body 1 is not limited to the connection structure between the bearing block 12 of the former and the support plate 13 of the latter, as shown in FIGS. 1, 3, and 4. do not have.

11 and 12 show that the support necks 46 protruding from both sides of the bearing block 12 are passed through the upper part of the support plate 13 and driven with a pair of bolts 47.
2 and the support plate 13 are shown. Reference numeral 39 indicates a retainer for the clasp that can be easily removed when releasing the fastening.

13 and 14 show another fastening example in which a bracket 40 and a pin 41 are used.

Figure 15 shows the I-type cotter 4 shown in Figure 16 A and B.
2 is used, and FIGS. 17 and 18 show a more simplified version in which the key 43 is used.

Figure 19 shows the thrust bearing part 1 on the U-shaped frame side.
1 and the furnace bottom 3 on the furnace body side are fastened together with a cross pin 44, thereby preventing a moment due to a load in the radial direction of the furnace body from acting on the thrust bearing portion 11.

20 and 21 show that the thrust bearing section 11 having the bearing block 12 is supported on the U-shaped frame 10 via the pin shaft 45 parallel to the axis Y, so that the load in the radial direction of the furnace body due to the tilting of the furnace body 1 is This prevents the moment from acting on the bearing block 12.

In the rotary furnace according to the present invention, the furnace body 1 can be tilted around the axis Y and rotated around the furnace axis X. Thermal expansion in the radial direction of the furnace body 1 can be accommodated by controlling the internal pressure of the fluid pressure cylinder 25 and operating the cylinder. Furthermore, when replacing the furnace body 1, the furnace body 1 is held in an inverted state, and the fluid pressure cylinder 25 is operated to separate the support rollers 23, 23' from the rails 26, 27 to release the connection between the furnace body 1 and the U-shaped frame 10. Accordingly, it can be placed on a steel receiving truck or the like placed below the furnace body 1.

Therefore, according to the present invention, the furnace body can be easily replaced, local wear can be prevented by rotating the furnace body, uniform slag coating can be achieved, and the furnace body can be coated with Remarkable effects such as being able to sufficiently cope with irregular thermal deformation and thermal expansion that occur can be obtained by the side support device.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the rotary furnace of the present invention with the furnace body in an upright state, Fig. 2 is a view taken along the line shown in Fig. 1, and Fig. 4 is a view taken along the line shown in Fig. 1. 3 is a side view showing the joint between the furnace body side and the U-shaped frame side, FIG. 5 is a plan view showing one set of side support devices, FIG. 6 is a front view thereof, and FIG. The figure is a longitudinal side view showing one example of the thrust bearing part, FIG. 8 is a longitudinal side view showing another example of the thrust bearing part, and FIG. 9 is a longitudinal side view showing still another example of the thrust bearing part. FIG. 10 is a side view showing another example of the rotary drive section, FIG. 11 is a front view showing an example of the coupling structure between the furnace body side and the U-shaped frame side, FIG. 12 is a side view thereof, and FIG. The figure is a front view showing another example of the joint structure between the furnace body side and the U-shaped frame side, FIG. 14 is a side view thereof, FIG. 15 is a front view showing still another example of the same joint structure, and FIG. Figures A and B are a side view and an end view of the I-type cotter used for this, Figure 17 is a front view showing still another example of the same joint structure, Figure 18 is a side view thereof, and Figure 19 is the same joint structure. FIG. 20 is a front view showing still another example of the same coupling structure, and FIG. 21 is a side view thereof. 1...Furnace body, 2...Furnace mouth, 3...Furnace bottom, 4...
Trunnion ring, 5, 6... Trunnion shaft, 7
... Frame, 8... Bearing, 9... Tilt device, 10...
... U-shaped frame, 11 ... Thrust bearing section, 12
... Bearing block, 13 ... Support plate, 14 ... Keyway, 15 ... Key, 16 ... Bolt nut, 1
7...Pin, 18...Kotta, 19...Side support device, 20,20'...Bracket, 21,2
1'...Lever, 22, 22'...Pivot, 23,2
3'...Support roller, 24, 24'...Pivot, 25
...Fluid pressure cylinder, 26, 27...Rail, 2
8... Central rotating shaft, 29... Thrust bearing, 30... Radial bearing, 31... Gear, 32... Pinion, 33... Motor, 34...
... rotary joint, 35 ... bearing for bearing block, 36 ... bush, 37 ... pin gear,
38...Pinion, 39...Keeper, 40...Bracket, 41...Pin shaft, 42...I-shaped knob, 43...Key, 44...Cross pin, 45...
...Pin shaft, 46...Support neck, 47...Kotta, X
...furnace axis, Y...axis line.

Claims (1)

[Scope of Claims] 1 In a furnace body 1 supported tiltably by trunnion shafts 5 and 6 provided on both sides of the furnace body 1 via a trunnion ring 4, the furnace body extends downward from both trunnion shaft mounting positions of the trunnion ring. A U-shaped frame 10 that goes around the bottom is fixedly installed, and a bearing block 12 that rotatably supports the furnace body around the furnace axis X is provided at the center of the lower end of the U-shaped frame. A rotary furnace characterized in that a plurality of rotary support mechanisms 19 of variable hydraulic pressure support type that move forward and backward are distributed and installed to jointly support the load in the radial direction of the furnace body that occurs due to the rotation of the furnace body. 2. A patent claim characterized in that a bearing block 12 containing a thrust bearing provided on the U-shaped frame side and a furnace bottom support plate 13 provided on the furnace body side are removably connected concentrically with the furnace axis X. The rotary furnace according to item 1.