JPH0350396Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to an air leakage prevention device for pallets for sintering machines. [Prior Art] To explain a commonly used sintering machine using drawings, as shown in Fig. 6, raw materials consisting of iron ore powder, limestone, and coke powder are cut out from an ore feed hopper 8 and loaded onto a pallet 1. do. This palette 1
is moved by a rotating sprocket 9, and the raw material on the loaded pallet 1 is ignited in an ignition furnace 7,
Air is sucked downward by a wind box 10 placed at the bottom of the pallet 1. As a result, the combustion zone advances downward from the top of the raw material layer, and the portion through which the combustion zone passes becomes sintered ore. [Problems to be solved by the invention] The ventilation resistance of this combustion zone and raw material layer is large, and therefore the pressure inside the wind box 10 is reduced to about -1000 to -2000 mmAq. The air leakage between the pallet 1 and the wind box 10 caused by this negative pressure is approximately equal to the sintering exhaust air volume.
This has reached as high as 15%, leading to an increase in electricity costs for exhaust fans. As shown in FIG. 7, the structure is such that the slide seal plate 4 is attached to the slide bed 5 between the lower side of the pallet 1 and the bed 6 of the wind box 10 via the spring 13 in the slide seal retaining cover 3 on the upper surface. Most of the leakage air is caused by the slide bed 5 and the slide seal plate 4.
This occurs from the gap between the slide seal holding cover 3 and the slide seal plate 4. Many countermeasures have been attempted to date to solve this air leakage problem, but none are effective due to reasons such as high modification costs, complicated equipment that causes many troubles, and inability to sufficiently prevent air leakage. It has not been implemented yet. For example, a device as shown in Japanese Utility Model Publication No. 57-52616 is a device in which a holding plate is provided on the bed, and the holding plate and a support plate elastically held via a spring are sealed via a bellows portion. However, this device is the fifth type used in general sintering machines.
Since the structure is significantly different from the air leakage prevention devices shown by numbers 3 to 5 in the figure,
When applying the technology described in "No. 1 Publication" to the general public,
It is necessary to replace the entire set of air leakage prevention devices, which increases equipment costs. The area around the air leakage prevention device is subject to environmental conditions where dust exists and the temperature is high, causing problems such as thermal distortion in the device after several months. Such devices tend to cause major troubles and are not practical. It has the following disadvantages. The purpose of this invention is to reliably seal the sliding part between the slide seal holding cover and the slide seal plate of a sintering machine pallet, eliminating the drawbacks of conventional air leakage prevention devices that are expensive equipment and have a complicated structure. The purpose of the present invention is to provide an extremely simple device that prevents air from entering the sintering exhaust air and thereby saves energy. [Problems to be Solved by the Invention] The technical means of the present invention for solving the above-mentioned problems includes: a slide seal holding cover provided on the sintering pallet in parallel to a rail that guides the pallet; A slide seal plate that is fitted into the slide seal holding cover and pressed by a spring, and a slide bed that is laid on the upper surface of the side of the wind box provided at the bottom of the pallet and slides the slide seal plate. In the air leak prevention device, a seal rod having a circular or polygonal cross section is movably provided in either or both of the gap between the slide seal plate and the slide bed, or the slide seal plate and the slide seal holding cover. This is a characteristic feature. [Function] A seal rod is provided in the gap between the slide seal plate and the slide bed or between the slide seal plate and the slide seal retaining cover so as to be movable in the longitudinal direction, and the seal rod is moved by the suction negative pressure of the wind box. It is drawn toward the wind box side to block the gap and prevent air from leaking through the gap. [Example] Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is a cross-sectional view of the air leak prevention device of the first embodiment, and FIG. 2 is a vertical cross-sectional view thereof. This air leakage prevention device 21 is used for the pallet 1 for sintering.
A slide seal retaining cover 3 is attached to the lower surface of the pallet 1 between the side lower surface of the wind box 10 and the bed 6 of the wind box 10.
The slide seal plate 4 pressed by 3 is inserted. This slide seal plate 4 is pressed and slid onto a slide bed 5 laid on the bed 6 on the upper side of the wind box 10. Furthermore, a seal rod 11 is movably inserted inside the space formed between the slide holding cover 3 and the slide seal plate 4, and held by a holding pin 12. In this way, the gap between the slide seal holding cover 3 and the slide seal plate 4 is hermetically sealed. FIG. 3 is a cross-sectional view of the air leak prevention device 22 of the second embodiment, in which a rectangular notch 14 is provided on the inner side of the slide seal plate 4, and the seal rod 11 is moved into the notch 14. It is designed so that it can be freely inserted and the gap between it and the slide seal holding cover 3 can be sealed off. FIG. 4 is a cross-sectional view of the air leak prevention device 23 of the third embodiment, in which the seal rod 11 is movably inserted onto the slide bed 5a extending to the outer side, and the slide bed 5a and the slide seal are inserted. The gap with the plate 4 is hermetically sealed. 5a to 5d are cross-sectional views and vertical sectional views showing various aspects of the sealing rod 11, in which FIG. Sealing rod 11b made of solid hexagonal material
Figure c shows a hollow round rod 15 made of rubber material and a metal rod 16.
The seal rod 11c inserted therein, and the seal rod 11d in FIG. These sealing rods 11 may have a circular, elliptical or polygonal cross section so that they can easily roll, and may be made of a material and shape that can be sucked by suctioning gas, etc. Since the negative pressure reaches -1000 to -2000 mmAq, other materials may be used as long as they can withstand this negative pressure and do not deform significantly. The structure is as described above, and when the sintering machine is in operation, the negative pressure inside the wind box 10 is -1000 as described above.
The pressure reaches approximately -2000 mmAq, and air leaks from the atmosphere side through the gap between the slide seal holding cover 3 and the slide seal plate 4 or the gap between the slide seal plate 4 and the slide bed 5. In order to block this leakage, the seal rod 11 is drawn toward the windbox 11 side due to the pressure difference between the inside of the windbox 10 and the atmosphere side, and closes these gaps to prevent leakage. In this case, since the blockage uses the suction force inside the wind box 10, the wear of the seal rod 11 is also small.
Even if wear and tear occurs, the main body will not be damaged due to the selection of materials, and maintenance can be carried out sufficiently by replacing only the seal rod 11. Moreover, since it is easy to replace and repair, and the structure of the seal rod 11 itself is simple, it can be implemented at low cost. Table 1 shows a comparison between the present invention and a conventional example when the present invention is implemented in an actual machine.

[Effect of idea]

As mentioned above, the sintering pallet air leakage prevention device of the present invention does not require any major modification of the commonly used sintering machine pallet air leakage prevention device, and can extremely easily prevent air leakage. The equipment cost is low and it is easy to implement. Furthermore, the sealing device is simple, there is no performance deterioration due to thermal strain or pallet vibration, and replacement is extremely easy. Furthermore, due to its excellent sealing properties, the air leakage rate has been reduced from 5% to 1%.
This is an extremely excellent air leakage prevention device that can reduce the amount of sintered ore to less than 20% at once, reduce the power consumption of the exhaust blower, and achieve stable firing of sintered ore quality by preventing air leakage.

[Brief explanation of drawings]

Figures 1 to 5 show embodiments of the present invention.
The figure is a cross-sectional view of the first embodiment, FIG. 2 is a vertical cross-sectional view of FIG. 1, FIG. 3 is a cross-sectional view of the second embodiment, and FIG. 4 is a cross-sectional view of the third embodiment. Figures 5a to 5d are cross-sectional views showing various aspects of the seal rod, Figure 6 is a side view showing an outline of the entire sintering machine, and Figure 7 is a partial cross-sectional view showing a conventional air leakage prevention device. FIG. 1...Pallet, 2...Rail, 3...Slide seal holding cover, 4...Slide seal plate,
5, 5a...Slide bed, 6...Bed, 7
... Ignition furnace, 8 ... Ore feed hopper, 9 ... Sprocket, 10 ... Wind box, 11, 11a, 11b,
11c, 11d... Seal rod, 12... Seal rod holding pin, 13... Spring, 14... Notch, 15... Hollow round bar, 16... Metal rod.

Claims (1)

[Scope of utility model registration request] A slide seal holding cover provided on the pallet parallel to the rail guiding the sintering pallet, a slide seal plate fitted into the slide seal holding cover and pressed by a spring, and a slide seal plate provided at the bottom of the pallet. In an air leakage prevention device that includes a slide head that is placed on the upper surface of the side of a wind box provided and slides the slide seal plate, the slide seal plate and the slide head, or the slide seal plate and the slide seal holding cover are connected to each other. A leakage prevention device for a sintering machine pallet, characterized in that a sealing rod having a circular or polygonal cross section is movably provided in one or both of the gaps.