JPH065402Y2 - Top furnace charging device for vertical furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an apparatus for charging raw materials into a vertical furnace such as a blast furnace using a swirling chute.

[Conventional technology]

As a device for charging raw materials into a vertical furnace such as a blast furnace, a charging chute that projects downward in the radial direction is attached to the lower part of a vertical chute provided in the core part, and a tiltable lower chute is provided at the tip part. Bellless charging devices are known. The raw material is distributed to predetermined positions in the furnace by tilting the lower chute in the radial direction of the furnace while rotating the entire chute with respect to the core axis.

As a mechanism for turning and tilting a chute, various types have been conventionally developed (for example, Japanese Patent Publication No. 55-375).
64, Japanese Patent Publication No. 56-31322, etc.).

However, in the conventional drive mechanism, the gear wheel is provided on the rotating disc, and further, a mechanism for transmitting power to each of the rotating disc, the gear wheel, and the shaft device is required. Therefore, the power transmission mechanism becomes complicated, and much labor and cost are required for designing, manufacturing, maintenance, and the like.

As a solution to such a drawback, the present inventors have
As shown in FIGS. 3 (a) and 3 (b), a raw material charging device in which a rotary shaft was built in a vertical chute was developed and filed separately.

In this raw material charging device, a vertical chute 51 is pivotally provided in the core portion. A charging chute 52 protruding in the radial direction is attached to the lower end of the vertical chute 51. Furthermore, at the tip of the charging chute 52,
A lower chute 53 having a three-stage structure is attached. The first-stage chute 53a of the lower chute 53 is arranged centering on a tilt axis 54 that is perpendicular to the radial direction of the furnace and has a predetermined tilt angle. The first-stage chute 53a is divided into two near the center position, and the lower half of the chute 53a is inclined shaft
Rotate around. This rotation causes the second-stage chute 53b and the third-stage chute 53c to tilt in the radial direction of the furnace. The third-stage chute 53c is a vertical chute.
Combined with the rotation of 51, the raw material is distributed to any position in the furnace.

A turning donkey 55 is attached to the outer periphery of the vertical chute 51. The power of the swing motor 56, which is located outside the furnace, is
Transmission to the turning donkey 55 via 57 drives the turning donkey 55 to rotate. As a result, the entire chute turns.

Further, inside the vertical chute 51, a power transmission shaft 58 is erected vertically. Then, a tilting cylinder 60 is installed on a swivel base 59 that turns simultaneously with the chutes 51 to 53, and a movable rod 61 of the tilting cylinder 60 is attached to a lower part of the first-stage chute 53a. Have concluded. The tilting cylinder 60 is reciprocated by supplying power from the power feeding intake section 64 to the tilting cylinder 60 by the power cable 63 guided into the furnace via the power transmission shaft 58. Due to this reciprocal movement, a torsional rotational force is applied to the first-stage chute 53a, and the lower chute 53 tilts. The power transmission shaft 58
In order to protect the power cable 63 from heat, a coupling 65 for supplying / discharging cooling water is attached to the.

[Problems to be solved by the device]

When charging the raw material into the vertical furnace by using this charging device, the raw material to be charged falls into the furnace from the vertical chute 51, the charging chute 52, the lower chute 53. Since the inner surfaces of the chutes 51 to 53 are subject to wear during the dropping process of the raw material, regular inspection is required. Also, after a predetermined time has passed, depending on the damage status of each chute 51-53,
Replacement work is performed.

However, since the chutes 51 to 53 are bent in a complicated shape, the removing work becomes troublesome. For example, if an attempt is made to lift the entire chutes 51 to 53 upward, the third-stage chute 53c attached to the tip of the second-stage chute 53b penetrating the turning base 59 becomes an obstacle. When attempting to take out the entire chutes 51 to 53 in the lateral direction, the vertical chute 51, the second-stage chute 53b, and the third-stage chute 53c are taken.
Etc. will be an obstacle. Therefore, replacement work takes time,
It is difficult to replace various devices arranged in the swivel cone during the periodic repair period.

Therefore, the purpose of the present invention is to make a part of the chute body separable, and to take out this part first, so that the vertical chute can be taken out upward and the lower chute can be taken out laterally to perform quick maintenance and management. To do.

[Means for Solving the Problems]

In order to achieve the object, the present invention arranges a chute body including a vertical chute, a charging chute and a lower chute inside a swivel cone, and penetrates the vertical chute and the charging chute to form a power transmission shaft. In a vertically standing furnace top charging device, a bending portion from the charging chute to the lower chute is configured to be removable, and an opening with a lid for taking out the removed bending portion is provided on a side surface of the swirling cone. It is characterized by being provided.

〔Example〕

Hereinafter, the features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the furnace top charging device of this embodiment. The first
In the figure, a turning mechanism, a swinging mechanism, a power transmission shaft, etc. are omitted.

This furnace top charging device has a swirl cone 2 having at its bottom a swivel base 1 attached to the furnace top of the blast furnace.
An opening for inserting the vertical chute 3 is provided at the center of the upper part of the swiveling cone 2. The charging chute 4 is connected to the lower end of the vertical chute 3, and the lower end of the charging chute 4 is further connected to the lower chute 5. The lower chute 5 is three-dimensionally and complicatedly bent from the first-stage chute 5a to the second-stage chute 5b and then to the third-stage chute 5c as shown in the figure. Inside the vertical chute 3, the third
As in the case of the figure, a power transmission shaft (not shown) is arranged so as to penetrate therethrough. Also, the first-stage shoot of the lower shoot 5
A mechanism (not shown) for imparting torsional rotation to 5a is also mounted on the swivel base 1 as in the case of FIG.

Since the vertical chute 3 and the lower chute 5 are complicatedly bent in this way, it is necessary to devise a method for removing each chute. Therefore, in this embodiment, the bent portion 6 from the charging chute 4 to the first-stage chute 5a can be separated from the charging chute 4 and the lower chute 5.
Then, the bent portion 6 is removed from the charging chute 4 and the lower chute 5 and then laterally taken out from the opening 7 with a lid provided on the side surface of the turning cone 2.

FIG. 2 shows the connection relationship of the chutes near the bent portion 6. The lower side of the bent portion 6 is the first stage 5a of the lower chute 5.
And are connected concentrically with some overlap. The upper side of the bent portion 6 is joined to the charging chute 4 by a flange or the like. Here, in order to avoid the complexity of the joint surface shape of the lower chute first stage 5a in which the tilting drive portion is present, the shape of the upper joint surface 10 of the bent portion 6 has the following structure in terms of the device structure. It is necessary to set so as to satisfy the constraint of.

(1) Crossover of the central axis of the upper portion of the bent portion 6 coinciding with the central axis 12 of the charging chute 4 and the central axis of the lower portion of the bent portion 6 coinciding with the central axis 13 of the lower chute first stage 5a. The angle formed as a surface is an obtuse angle in this embodiment. Therefore, considering the weight of the lower chute first stage 5a when removing the bent portion 6, the central axis 13 of the lower chute first stage 5a is taken into consideration.
It is preferable to move the bent portion 6 along. To satisfy this condition, the angle of the joint surface of the bent portion 6 with respect to the charging chute 4 is at least parallel to the central axis 13 of the first step 5a of the lower chute, or the angle at which the surface and the axis do not intersect in the moving direction. Must be set to.

(2) On the other hand, it is inevitable that the support shell 9 connecting the turning gear 8 and the turning base 1 interferes with the charging chute 4. This interference portion forms a fixed portion of the charging chute 4, and the upper joint surface 10 between the charging chute 4 and the bent portion 6 is arranged in the vicinity.

Due to these design technology restrictions, as shown in FIG.
The lower side of the bent portion 6 is the central axis 13 of the first stage 5a of the lower chute.
A circular cross section perpendicular to On the other hand, it is preferable that the upper joint surface 10 of the bent portion 6 has a cross section cut along a vertical plane so as to be perpendicular to the central axis 12 of the charging chute 4 on the projection plane. As a result, the bent portion 6 can be easily removed.

When the bent portion 6 is removed, the inside of the turning cone 2 is in communication with the inside of the furnace. Therefore, the opening of the lower chute 5 that communicates with the inside of the furnace is closed with a blind plate, and the drive parts such as the speed reducer and the bearing in the turning cone 2 are removed. Further, the vertical chute 3 is moved upward and removed from the turning cone 2.
Then, by removing the lower chute 5 to the side, the chute is disassembled.

[Effect of device]

As described above, in the present invention, the bent portion from the charging chute to the lower chute is separable, so that when the parts in the turning cone are replaced, the bent portion is first removed and then the upper portion is moved upward. By taking out the vertical chute and the lower lower chute separately from each other, the replacement work is quick and easy. Thus, according to the present invention, the work can be completed within the regular repair period.

[Brief description of drawings]

FIG. 1 shows a main part of a charging device in an embodiment of the present invention,
FIG. 2 is a view showing the vicinity of a separable bent portion. On the other hand, FIG. 3 shows the charging device previously proposed by the present inventors. 1 ... Swivel base, 2 ... Swivel cone 3 ... Vertical chute, 4 ... Charging chute, 5 ... Lower chute, 6 ... Bend, 7 ... Opening with lid, 8 ... Swivel gear, 9 ... Support shell, 10 ... upper joint surface 11 ... central axis of vertical chute 3 12 ... central axis of charging chute 4 13 ... central axis of lower chute 1st stage 5a (tilt axis) 14 ... lower chute first Center axis of 2nd stage 5b 15 …… Center axis of lower chute 3rd stage 5c

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Mitsumasa Todaka 59 Nippon Steel Plant Design Co., Ltd., 46 Nakahara, Tobata-ku, Kitakyushu, Fukuoka

Claims (1)

[Scope of utility model registration request] 1. A chute body comprising a vertical chute, a charging chute and a lower chute is arranged inside a swiveling cone,
In a furnace top charging device in which a power transmission shaft is erected vertically through the vertical chute and the charging chute, a bent portion from the charging chute to the lower chute is configured to be removable, and removed. A furnace top charging device for a vertical furnace, wherein an opening with a lid for taking out the bent portion is provided on a side surface of the swirling cone.