JPH10339582A - Top opening/closing gate apparatus for stock preheating tank - Google Patents

Abstract

(57) [Problem] To provide an opening / closing function and a function of improving the sealing performance by pressing a seal member simultaneously, wherein the movement trajectory of the gate is a smaller space, and the raw material into which the seal member is charged is provided. Provided is a gate device for opening and closing a top portion of a raw material preheating tank, which is disposed at a position not to be directly hit. SOLUTION: A top opening / closing gate device 30 for a raw material preheating tank attached to an arc furnace for steelmaking. A hopper 19 provided at the top of the raw material preheating tank 4 and having a horizontal opening lower end, and an elastic seal member 22 provided along the outer periphery of the opening lower end of the hopper.
A gate 16 in which the outer peripheral portion upper surface contacts the seal member;
An opening and closing device 32 for opening and closing the gate. Switchgear 3
2 is a gate between a lifting drive shaft 17 and a traversing drive shaft 18 which are arranged in parallel with each other and are spaced apart in the width direction, and a position U pressed against the seal member and a disengagement position D by swinging of the lifting drive shaft. And a traversing link mechanism 36 that moves the gate between the disengagement position D and the opening position O by swinging the traversing drive shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material preheating device attached to a steelmaking arc furnace, and more particularly to a top opening / closing gate device for a raw material preheating tank.

[0002]

2. Description of the Related Art FIG. 5 shows a structural example of a steelmaking arc furnace. An arc furnace is a furnace that generates an arc between a raw material charged in a furnace and an electrode to melt the raw material, and then refines the steel to produce steel. The arc furnace is provided with a furnace lid raising and turning device for allowing the furnace lid to escape from above the furnace because the raw material is charged from a charging bucket from the upper part of the furnace.

[0003] In a steelmaking arc furnace, raw materials (scrap) are used.
A shaft type preheating tank (raw material preheating tank) for preheating the raw material with high temperature exhaust gas from a furnace is used for energy saving. In such a shaft type preheating tank, an opening / closing gate is provided at the top of the preheating tank in order to prevent inflow of air into the preheating tank and outflow of high-temperature exhaust gas. This gate is always closed, so that when the top is closed by the charging bucket, the gate opens so that the material in the bucket can be charged into the preheating tank while preventing the inflow of air and the outflow of gas. It has become.

[0004]

FIGS. 6 and 7 show examples of the construction of an opening / closing gate which can be used in the above-mentioned shaft type preheating tank. FIG. 6 shows a lever system and FIG. 7 shows a gate system. . Since the shaft-type preheating tank itself is under planning, the opening and closing gates in FIGS. 6 and 7 are not publicly known, but can be easily created by those skilled in the art.

However, the general set of lever systems shown in FIG. 6 has the disadvantage that the path of the opening / closing gate 16 becomes large and the effective area of the preheating tank 4 becomes narrow. Further, in the horizontally movable gate shown in FIG. 7, there are many problems such as a large number of troubles of biting into the slide portion in an atmosphere having a lot of dust, poor sealing performance, an increase in the size of the driving device, and complexity. . In these figures, 19 is a hopper, 7 is a raw material,
9 is the raw material level after charging.

The present invention has been made to solve the above problems. That is, an object of the present invention is to reduce the vertical trajectory of the gate, increase the effective area, reduce troubles such as biting by dust and the like, have high sealing properties, have a simple structure, and reduce the size of the driving device. An object of the present invention is to provide a gate device for opening and closing a top portion of a preheating tank.
In other words, an object of the present invention is to provide an opening / closing function and a function of improving the sealing performance by pressing the seal member at the same time, and the movement locus of the gate is a smaller space,
An object of the present invention is to provide a gate device for opening and closing a top portion of a raw material preheating tank, wherein a sealing member is disposed at a position where the raw material to be charged is not directly hit.

[0007]

According to the present invention, there is provided a gate opening / closing gate device for a raw material preheating tank attached to an arc furnace for steelmaking, comprising a hopper provided at the top of the raw material preheating tank and having a horizontal opening lower end. An elastic seal member provided along the outer periphery of the lower end of the opening of the hopper, a gate whose outer peripheral portion is in contact with the seal member, and an opening and closing device for opening and closing the gate, wherein the opening and closing devices are parallel to each other. A lifting drive shaft and a traversing drive shaft which are arranged and are spaced apart in the width direction, and a pressing position U and a release position D on the seal member by swinging of the lifting drive shaft.
And a traversing link mechanism for moving the gate between the disengagement position D and the opening position O by swinging the traversing drive shaft. Is provided.

According to the structure of the present invention, since the seal is provided by the contact between the elastic seal member provided along the outer periphery of the lower end of the opening of the hopper and the upper surface of the outer peripheral portion of the gate, the seal member is inserted. No direct hits of raw materials. In addition, since the gate is moved between the pressing position U to the seal member and the release position D by the lifting link mechanism, the seal member can be pressed and the sealing performance can be improved. Further, since the gate is moved between the disengagement position D and the opening position O by the traversing link mechanism, the opening and closing function and the sealing function can be simultaneously provided by using the lifting link mechanism together. In addition, the gate is pressed against the seal member by the swing of the lifting drive shaft.
From the disengagement position D to the opening position O by swinging of the traversing drive shaft, the movement locus of the gate can be made smaller. Therefore, the trajectory of the gate in the vertical direction is small, the effective area can be widened, troubles such as biting by dust and the like are small, the sealing property is high, the structure is simple, and the driving device can be downsized.

According to a preferred embodiment of the present invention, the lifting link mechanism comprises: a pair of lower lifting levers having lower ends fixed to the outer peripheral portion of the gate at the pressing position U and extending upward; One end is rotatably attached to the upper end of the
1 whose other end is rotatably mounted coaxially with the lifting drive shaft
A pair of upper lifting levers, at least one of the upper lifting levers being fixed to a lifting drive shaft, the traversing link mechanism having one end fixed to the outer peripheral portion of the gate at the pressing position U, A pair of lower traversing levers, and one end is rotatably attached to the other end of the lower traversing lever,
1 whose other end is rotatably mounted coaxially with the traversing drive shaft
And a pair of upper traversing levers, at least one of the upper traversing levers being fixed to the traversing drive shaft.

With this configuration, the gate is pressed against the seal member by the swinging of the lifting drive shaft via the pair of upper lifting lever and lower lifting lever pivotally connected to each other.
And the disengagement position D. Similarly, by swinging the traversing drive shaft, the gate is moved substantially laterally between the disengagement position D and the opening position O via a pair of upper traversing levers and lower traversing levers pivotally connected to each other. Can be.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to the common parts in the respective drawings, and the duplicate description will be omitted. FIG. 1 is an overall view of a steelmaking arc furnace and a shaft type preheating tank provided with a top opening / closing gate device according to the present invention. High-temperature exhaust gas 9 from the arc furnace 1 is sucked by an exhaust fan 10. On the other hand, the raw material 7 (scrap) is periodically sent to the furnace top hopper 19 by the bucket 13 carried by the crane.
Is opened and the raw material preheating tank 4 is charged. At this time, the bucket itself and the bucket lid 15 are sealed so that the furnace top is not opened. Further, the raw material 7 in the raw material preheating tank 4 is continuously cooled down in the tank by the action of the pushers 5 and 6 and is charged into the furnace while exchanging heat with the exhaust gas 9.

FIG. 2 is a structural view of a top opening / closing gate device according to the present invention, and FIG. 3 is an enlarged view of a portion A in FIG. FIG.
As shown in FIG. 1, the top opening / closing gate device 30 of the present invention includes a hopper 19, an elastic seal member 22, a gate 16, and an opening / closing device 32. The hopper 19 is provided at the top of the raw material preheating tank 4 and has a horizontal opening lower end. The seal member 22 is provided along the outer periphery of the lower end of the opening of the hopper 19. The seal member 22 is preferably made of, for example, heat-resistant rubber having airtightness and heat resistance. The gate 16 is a plate-like member that closes the lower end of the opening of the hopper 19 from below, and the upper surface of the outer peripheral portion comes into contact with the seal member 22 to seal therebetween. That is, the gates 16 are provided at the lower end of the hopper 19 and are sealed with each other by the elastic seal members 22. Also, the sealing member 22
Are located outside the hopper opening 23 as shown in FIG.

The opening / closing device 32 includes a lifting drive shaft 17 and a traversing drive shaft 18, and a lifting link mechanism 34 and a traversing link mechanism 36. Lifting drive shaft 17 and traversing drive shaft 18
Are arranged parallel to each other and are spaced apart in the width direction.
The drive shafts 17 and 18 can be independently swung by a drive device (not shown).

In the embodiment shown in FIG. 2, the lifting link mechanism 34 includes a pair of lower lifting levers 34a extending vertically.
And a pair of upper lifting levers 34b extending substantially horizontally.
Consists of These are provided outside the hopper 19 and inside the raw material preheating tank 4, and only one of them is shown in the figure. The lower ends of the pair of lower lifting levers 34 a are fixed to the outer peripheral portion of the gate at the pressing position U against the seal member 22. One end of the pair of upper lifting levers 34b is rotatably mounted on the upper end of the lower lifting lever 34a, and the other end is rotatably mounted coaxially with the lifting drive shaft 17. Further, at least one of the upper lifting levers 34 b (the side shown in this figure) is fixed to the lifting drive shaft 17. With this configuration, the gate 16 can be moved substantially vertically between the pressing position U against the seal member 22 and the detaching position D by the swing of the lifting drive shaft 17.

The traversing link mechanism 36 includes a pair of lower traversing levers 36a extending in the traversing direction, and a pair of upper traversing levers 36b extending in the substantially vertical direction. These are also provided outside the hopper 19 and inside the raw material preheating tank 4, and only one of them is shown in the figure. One end of the pair of lower traversing levers 36a is fixed to the outer periphery of the gate at the pressing position U. A pair of upper traversing levers 36b
One end of the lower traversing lever 36a is rotatably attached to the other end, and the other end is rotatably mounted coaxially with the traversing drive shaft 18. In addition, upper traversing lever 3
6b is fixed to the traversing drive shaft 18 (the side shown in this figure). With this configuration, the traversing drive shaft 1
By the swing of 8, the gate 16 can be moved substantially laterally between the detached position D and the opening position O. In this movement, the gate 16 swings around the upper end of the lower lifting lever 34a fixed thereto, so that the gate 16 at the opening position O is in an inverted position as shown by a thin line in FIG. Become.

That is, the gate 16 is connected to the lifting levers 34a and 34b at two places on the left and right, and is also connected to the traversing levers 36a and 36b at two places on the left and right. Each of the levers is provided with a rotational motion by a driving device (not shown) on the pins of the driving shafts 17 and 18. The gate 16 is opened when the raw material 7 is charged, and the timing is determined by detecting the raw material position in the tank by another sensor. 9 is the level immediately after loading, and 8 is the level immediately before loading.

FIG. 4 is an explanatory view of the operation of the top opening / closing gate device of the present invention. In this figure, (A) shows the gate 1
6B shows a non-operating state in which the gate 6 is closed, and FIG. 6B shows an operating state in which the gate 16 is opened and closed. As shown in FIG.
6 first releases the press-fit of the seal member by the action of the lifting levers 34a and 34b, and moves down to the detached position D (solid line). When the reverse movement is performed, the pressure rises to the pressing position U (broken line), and the seal member 22 is naturally pressed tightly to improve the sealing performance.

Subsequently, the gate 16 moves to the open position O (two-dot chain line) by the action of the traversing levers 36a and 36b. This position is a position where the hopper 19 is completely opened. At this time, the gate 16 opens and closes by the action of the traversing levers 36a and 36b, but moves along the locus indicated by 24 due to the interference of the lifting levers 34a and 34b.

As described above, according to the configuration of the present invention,
The seal is formed by the contact between the elastic seal member 22 provided along the outer periphery of the lower end of the opening of the hopper 19 and the upper surface of the outer peripheral portion of the gate 16, so that the raw material 7 (scrap) into which the seal member 22 is charged can be directly hit. I do not receive. Further, since the gate 16 is moved between the pressing position U to the seal member and the release position D by the lifting link mechanism 34, the seal member 22
To improve the sealing property. Further, since the gate 16 is moved between the opening position O of the disengagement position D by the traversing link mechanism 36, the opening and closing function and the sealing function are simultaneously provided by the combined use with the lifting link mechanism 34. Further, the swinging of the lifting drive shaft 17 moves the gate 16 from the pressing position U to the seal member 22 to the disengagement position D, and then the swinging of the traversing drive shaft 18 causes the gate 16 to move from the disengagement position D to the opening position O
The movement trajectory of the gate 16 can be reduced to a smaller space by moving the gate 16 substantially in the horizontal direction. Therefore, the trajectory of the gate 16 in the vertical direction is small, the effective area can be widened, troubles such as biting by dust and the like are reduced, the sealing property is high, the structure is simple, and the driving device can be downsized.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

[0021]

As described above, the top opening / closing gate device of the raw material preheating tank of the present invention has the following effects. The operation of the lifting levers 34a, 34b can maintain a stable sealing property by applying an upward force vertically, as compared to the case of simply contacting. By providing the vertical movement, the sealing position can be easily arranged outside the opening and above the end of the hopper, and this can prevent collision damage due to the raw material falling in the hopper. The opening / closing trajectory of the gate 16 can be made smaller. This means that interference with the internal raw material can be avoided and the upper limit of the raw material can be increased. This is also effective for the preheating effect. Further, since the trajectory of the gate is small, the space of the furnace top 12 can be small, which contributes to cost reduction.

Therefore, the top opening / closing gate device of the raw material preheating tank according to the present invention has a small trajectory in the vertical direction of the gate, can widen the effective area, has little troubles such as biting by dust and the like, has a high sealing property, and has a structure. It is simple and has excellent effects such as a compact drive device.

[Brief description of the drawings]

FIG. 1 is an overall view of a steelmaking arc furnace and a shaft type preheating tank provided with a top opening / closing gate device according to the present invention.

FIG. 2 is a configuration diagram of a top opening / closing gate device according to the present invention.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is an explanatory view of the operation of the top opening / closing gate device of the present invention.

FIG. 5 is a structural example of a conventional arc furnace for steelmaking.

FIG. 6 is a structural example of an arc furnace for steelmaking.

FIG. 7 is another structural example of an arc furnace for steelmaking.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arc furnace for steelmaking 2 Molten steel 3 Furnace lid 4 Raw material preheating tank 5 Lower pusher 6 Upper pusher 7 Raw material (scrap) 8 Raw material level just before charging 9 Raw material level after charging 10 Exhaust fan 12 Top of preheating tank 13 Raw material bucket 14 Bucket opening / closing device 15 Bucket lid 16 Gate 17 Lever rotating shaft 18 Lever rotating shaft 19 Hopper 22 Seal member 23 Hopper opening 24 Gate trajectory 30 Top opening / closing gate device 32 Opening / closing device 34 Lifting link mechanism 34a Lower lifting lever 34b Upper portion Lifting lever 36 Traversing link mechanism 36a Lower traversing lever 36b Upper traversing lever

Claims (2)

[Claims] 1. A gate device for opening and closing a top portion of a raw material preheating tank attached to a steelmaking arc furnace, comprising: a hopper provided at the top of the raw material preheating tank and having a horizontal opening lower end; And an opening and closing device that opens and closes the gate. The opening and closing devices are arranged in parallel with each other and are suspended at intervals in the width direction. An upper drive shaft and a traverse drive shaft, a lifting link mechanism for moving the gate between a pressing position U and a release position D on the seal member by swinging of the lifting drive shaft, and a release position by swinging of the traverse drive shaft. And a traversing link mechanism for moving the gate between D and the opening position O. A top opening / closing gate device for a raw material preheating tank. 2. The lifting link mechanism, wherein a lower end is fixed to an outer peripheral portion of a gate at a pressing position U, a pair of lower lifting levers extending upward, and one end is rotatable at an upper end of the lower lifting lever. A pair of upper lifting levers mounted and rotatably mounted on the other end coaxially with the lifting drive shaft;
At least one of the upper lifting levers is fixed to a lifting drive shaft, and the traversing link mechanism has a pair of lower traversing levers each having one end fixed to an outer peripheral portion of the gate at the pressing position U and extending in the traversing direction. A pair of upper traversing levers, one end of which is rotatably attached to the other end of the lower traversing lever and the other end of which is rotatably mounted coaxially with the traversing drive shaft, at least one of the upper traversing levers being traversingly driven. Fixed to the shaft,
The top opening / closing gate device of a raw material preheating tank according to claim 1, wherein: