JPH07878Y2 - Sintering machine sub gate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a sintering machine used for producing a sinter for a blast furnace, and more particularly to a subgate under a feed hopper.

<Prior Art> Fig. 5 shows the ore feeding section of a general Dwightroid sintering machine.
FIG. 6 shows a front view of the lower portion of the feed hopper 4.

The blended raw material 11 stored in the feed hopper 4 is cut out onto the pallet 9 by the drum feeder 1. The cutout amount is roughly determined by the number of rotations of the drum feeder 1 and the position of the main gate 2, and the subgate 3 below the main gate 2 further finely adjusts the cutout amount. A plurality of sub-gates 3 are usually attached in the width direction of the pallet, and the opening degree of each is adjusted by the power cylinder 7.

The raw material layer thickness L · 10 on the pallet 9 is measured by an ultrasonic meter 12, and is controlled to reach a target value by controlling the rotation speed of the drum feeder 1 and the opening degrees of the main gate 2 and the sub gate 3. . The conventional sub-gate is made of high chromium cast iron or the like in order to improve wear resistance, but the sintering raw material adheres to the back of the sub-gate as the deposit 5. As the deposit 5 grows, the gap between the drum feeder 1 and the sub-gate 3 becomes smaller, and in order to keep the raw material layer thickness 10 at the target value, it is necessary to increase the rotation speed of the drum feeder 1.

Before the number of rotations of the drum feeder 1 reaches the upper limit, the operator performs the work of dropping the deposit 5, but this work is normally performed about once every 30 minutes, which is a great workload. Further, since the attachment 5 is not constant in the pallet width direction, the raw material layer thickness L changes in the pallet width direction, which causes uneven burning.

Therefore, as disclosed in Japanese Utility Model Application Laid-Open No. 56-175393, there is a technique in which a water storage tank is provided above a subgate and water is dropped on the back of the subgate to prevent the growth of deposits. It is true that this method does not allow the deposits to grow easily, but has the drawbacks that the water content of the blended raw materials tends to fluctuate, aeration fluctuations tend to occur, the dropping port under the storage tank is easily clogged, and maintenance is difficult.

<Problems to be Solved by the Invention> In view of the above-mentioned current situation, the present invention is based on the fact that it has been put into practice.
It was made to provide a sintering machine sub-gate that can prevent the adhesion of sintering raw materials, reduce the work load for removing adhered substances, and reduce uneven burning without using a special device as in Japanese Patent Publication No. It is a thing.

<Means for Solving the Problems> The present invention is a subgate under a feed hopper of a Dwightroid type sintering machine, wherein the subgate is made of a polymer resin, or a polymer is provided on a surface of the subgate contacting a sintering raw material. It is a sintering machine subgate characterized by lining resin,
In addition, the angle θ between the surface connecting the drum feeder center axis and the subgate tip and the lower surface of the subgate tip is 30 to 80 °.
In addition, the sintering machine subgate according to the above paragraph, characterized in that the cross-section has a pre-drawn shape.

<The process and action that led to the invention> The conventional subgate was reviewed in terms of shape and material.

FIG. 7 (a) shows an inverted L-shaped subgate 1 that is often used conventionally.
6 and FIG. 7 (b) shows a sub-gate of the flat plate type sub-gate 17.

In these sub-gates, the flow of the discharged raw material 11 is directly affected by the deposit 5 attached to the back of the sub-gate, and the thickness H of the discharged raw material on the drum feeder 1 decreases with the growth of the deposit 5 and is non-uniform in the width direction. Became.

Therefore, a sub-gate 18 having a tapered shape as shown in FIGS. 1 to 3 was devised. Since the flow of the discharged raw material 11 is narrowed down, it is considered that the raw material discharge is not so much affected even if the deposit 5 grows to some extent. Was tested.

In terms of materials, high chromium cast iron, SS, etc. have been used in terms of wear resistance, impact resistance, cost, etc., but this time, especially polyethylene resin, ceramics (alumina type), and stainless steel with smooth surfaces were tested. did.

FIG. 1 shows an example of a sub-gate according to the present invention. In this shape, three types of materials {polyethylene resin, stainless steel, ceramics (alumina series)} were used for trial production.

FIG. 2 shows an angle θ formed between the surface 19 connecting the central axis of the drum feeder 1 and the subgate tip surface and the subgate tip lower surface 20.
Experiments were carried out using the subgates 18 made of the three types of materials described above.

The experiment was performed using a DL type sintering machine with a grate area of 210 (m ² ), replacing all of the five sub-gates 3 of the mining section with the prototype gates 18. With the drum feeder rotation speed and the pallet speed kept constant, changes in the material layer thickness L over time were recorded, and the results are shown in FIG. It shows that the larger the layer thickness change-dL / dt (mm / hr), the faster the growth of deposits on the back of the sub-gate, but it becomes difficult for the sintering raw materials to attach in the order of polyethylene resin, ceramics (alumina), and stainless steel. I understand. Since polyethylene resin is self-lubricating, it is difficult for the sintering raw material with a grain size of 1 to 2 mm to adhere even if the surface is rubbed.

It was also found that even with a subgate made of polyethylene resin, no adhered matter was observed when the mounting angle θ was 30 to 80 °. In other words, the sub-gate that does not adhere deposits is completed only after the two elements of the material of polyethylene resin and the appropriate selection of raw materials are combined.

It should be noted that, although the subgate was tested with a polyethylene resin, any polymer resin having lubricity may be used, such as Teflon,
Similar effects can be obtained by using nylon or polypropylene resin, or vinyl chloride resin.

Further, although the sub-gate itself is made of a polymer resin, a similar effect can be obtained even if the conventional iron surface is lined with a polymer resin.

<Example> An operation result when a sub-gate made of polyethylene resin having a shape as shown in FIG. 1 is attached at an angle θ = 50 °, and an operation result when the conventional high chromium cast iron liners 16 and 17 are used Is shown in Table 1. The result of this operation is a grate area of 210 m ²
This is the result of operating each of the DL type sintering machines for 3 days.

In this way, the use of the subgate according to the present invention has the great advantages of reducing the work load for cleaning the deposits on the back of the subgate and improving the yield by reducing uneven burning in the pallet width direction (returned ore generation ratio is reduced by 0.5 to 0.6%). It was

The polyethylene resin subgate according to the present invention does not wear so much and can be continuously used for 3 to 4 months, and there is no particular problem in maintenance.

<Advantages of Device> According to the lower subgate of the feed hopper according to the present invention, it is possible to prevent the adhered matter from adhering to the back of the subgate without using a special device.

As a result, when a sinter ore is produced by a Dwightroid type sinter, the work load is greatly reduced and the product yield is improved.

[Brief description of drawings]

1 is a front view, FIG. 1B is a side sectional view, FIG. 2 is a side view of mounting the subgate according to the invention, and FIG. 3 is a side view of the invention. FIG. 4 is a side sectional view for explaining the operation of the sub-gate, FIG. 4 is a characteristic diagram showing the relationship between material, (mounting) angle, and layer thickness change, and FIG.
FIG. 6 is a side view of the lower part of the feed hopper, FIG. 6 is a front view of FIG. 5, and FIGS. 7 (a) and 7 (b) are side sectional views of a conventional subgate. 1 ... Drum feeder, 2 ... Main gate, 3 ...
Sub-gate, 4 ... Feeding hopper, 5 ... Adhesive part, 6 ...
… Link mechanism, 7… Power cylinder, 8… Sloping chute, 9… Pallet, 10… Raw material layer thickness, 11
…… Discharged raw material, 12 …… Ultrasonic level meter, 16 …… Inverted L-shaped subgate, 17 …… Flat-shaped subgate, 18 …… Converged subgate, 19 …… The surface that connects the drum feeder center axis and the subgate tip surface , 20 …… Sub-gate bottom surface, H …… Drum feeder discharge raw material thickness, L …… Pallet raw material layer thickness, θ …… (Mounting) angle.

Claims (2)

[Scope of utility model registration request] 1. A subgate under a feed hopper of a Dwightroid type sintering machine, characterized in that the subgate is made of a polymer resin, or a polymer resin is lined on a surface of the subgate which contacts a sintering raw material. Sintering machine sub gate. 2. An angle θ between the surface connecting the drum feeder central axis and the sub gate tip and the lower surface of the sub gate tip is 30 to 30.
The sintering machine sub-gate according to claim 1, wherein the cross-section has a pre-drawn shape at 80 °.