JPH0222155A - Grate plate - Google Patents

Abstract

PURPOSE:To lessen deformation and crackings and to use a grate plate for a long period of time by making the surface of main body of a plate between a support piece and a jaw piece into a corrugated shape in the direction of both edges and the back of main body of plate into a tapered face. CONSTITUTION:In this grate plate, a corrugated face 21 has a wavy form wherein ridges of cooled air circulation holes 11 and valleys between the circulation holes 11. Thickness of the main body 10 of plate from the surface in a tapered face 22 is set to have relationship of T>t when thickness of part provided with a support piece 8 is T and thickness of part equipped with a jaw piece 9 is t. Three grooved parts 23 at cut edges, for example, are formed at positions shown by the figure, maintain rigidity of rear half part of the main body 10 of plate, the setting positions may be changed to release occurrence of stress resulting from deformation of the front half part and number and the shape of the notched parts can be variably altered.

Description

DETAILED DESCRIPTION OF THE INVENTION Production Part 1 - The present invention relates to a grate plate for a clinker cooling device attached to a rotary kiln of a cement production facility, and particularly to a fuller type grate plate.

Figure 7 shows an example of a clinker cooling system equipped with this type of grate plate.

In this cooling device, high-temperature (approximately 1250°C to 1350°C) cement clinker 101 exits a rotary kiln (not shown), becomes molten, falls into a cooling chamber (not shown), and is placed on a grate plate. Ru. The grate plate is configured such that movable grate plates 102 and fixed grate plates 103 are arranged alternately, and the clinker 101 placed on the grate plate
is then gradually transferred in the direction of the arrow by the reciprocating motion of the movable grate plate 102, and during this transfer, cooling air is supplied from below the grate plate to the clinker 1 through the distribution holes described later in the grate plate. ,
It is cooled to a predetermined temperature (40°C to 100°C).

105 and 106 are a movable grate plate support and a fixed grate plate support, respectively, and 107 is a T bolt.

Recently, plates such as those shown in FIGS. 8 and 9 have been used as the above-mentioned great plate. This great plate 102 (103) has a rectangular plate main body 110 with a support piece 108 for a T-bolt 107 provided approximately at the center of the back surface, and a jaw piece 109 provided at one end edge of the back surface. Support piece 10 of plate body 110
A plurality of cooling air circulation holes 111 and 112 are formed between the support piece 8 and the jaw piece 109 and between the support piece 108 and the other end edge. In addition, the other edge of the back surface of the plate body 110,
Reinforcing ribs 113, 113' are provided on both side edges and the center portion from the other end edge to the support piece 108, and on both side edges and the center portion from the support piece 108 to the jaw piece 109, for increasing rigidity.
are continuously provided in contact with the support piece 108 and the jaw piece 109. Reference numeral 114 indicates a cooling air circulation hole formed in the jaw piece 109.

The problem to be solved by the invention is that in the above-mentioned great plate, the front half of the surface that is used (between the support piece 108 and the jaw piece 109)
and the rear half (support piece 108 and reinforcing rib 11 provided on the other end edge)
There is a large variation in temperature between 3 and 3). In other words, the front half of the surface and the jaw piece 109 are always at a high temperature in the clinker 101.
Because it is in contact with
Large thermal stress also occurs. On the other hand, the latter half repeats the process of pushing away the clinker 101 or being covered by the clinker due to the reciprocating movement of the movable grate plate 102, so it receives relatively less heat and is kept at a lower temperature than the first half. , the temperature difference between the front and back surfaces is also small. Therefore, the difference in elongation between the front and back surfaces is small, and the generation of thermal stress is not very large in the first half.

Due to the generation of the thermal stress difference between the first half and the second half, the great plate 102 (103) is likely to be deformed or cracked. In particular, since the reinforcing ribs 113 are continuously provided to strengthen the rigidity of the great plate, this may cause damage during cooling, causing cracks etc. mainly in the weak plate parts where the circulation holes 111 and 112 are provided. This results in the occurrence of

Therefore, there was a problem that uniform cooling of the clinker 101 and its smooth transfer were gradually hindered, and the grate plate 102 (103) had to be replaced in a short period of time.

Therefore, the present invention solves the problems of the conventional grate plate, reduces the difference in thermal stress occurring between the front and rear parts of the grate plate, reduces deformation and cracking, and allows the plate to be used for a long period of time. Aims to provide great plates.

In order to achieve the above object, the present invention provides a plate main body 10 between the support piece 8 and the jaw piece 9 as shown in FIGS.
The surface of the plate body 10 is formed into a wavy surface 21 which is wavy toward both side edges, and the back surface of the plate body 10 where the wavy surface 21 is located is a tapered surface whose wall thickness gradually becomes thinner from the support piece 8 to the jaw piece 9. 22, and an edge notch 23 is formed in the reinforcing rib 13.

Since the surface of the plate body 10, which is the heated side, is formed into the corrugated surface 21 as described above, the surface area is larger than the flat surface on the back surface. The difference in thermal expansion due to the temperature difference between the heated side and the cooled side is absorbed by the area difference, and the unit length (
The actual deformation in width direction length) is reduced.

In addition, since the back surface is formed into a tapered surface 22, the cooling effect of the cooling air from below on the jaw piece 9 side, which tends to reach high temperatures, is improved, and the temperature difference between the front and back surfaces in the front half of the plate body IO is reduced. As the temperature decreases, the temperature difference between the first half and the second half also decreases, and the temperature difference during repeated heating and cooling also decreases. Therefore, it is possible to use the device in a state where the temperature gradient between the first half and the second half is small, and the difference in thermal stress generated between the first half and the second half becomes smaller.

Furthermore, since the edge notch 23 is formed in the reinforcing rib 13, the deformation restraining force of the rear half on the front half is reduced, and the heat generated between the front half and the rear half due to temperature changes in the plate body 10 itself is reduced. The stress difference becomes smaller.

A single embodiment of the present invention will be described below with reference to the drawings, focusing on configurations other than those described above.

In FIGS. 1 to 4, the corrugated surface 21 corresponds to the cooling air circulation hole 11.
The waveform is such that the peaks are the peaks, and the valleys are the valleys between the flow holes 11.

Regarding the thickness of the tapered surface 22 from the surface of the plate body 10, the thickness of the portion where the support piece 8 is provided is T, the thickness of the portion where the jaw piece 9 is provided is t, and the relationship between the two is as follows. It is set to be Tit.

In addition, in this embodiment, conventional eighth and ninth grooves are provided on both side edges and the central part from the support piece 8 to the jaw piece 9 on the back surface of the plate body 10.
Reinforcing ribs 113' as shown in the figures are not provided, and the jaw pieces 9 are similarly not provided with cooling air circulation holes 114.

In this embodiment, three edge notches 23 are formed at the positions shown in the figure, but this can be done if the rigidity of the rear half of the plate body 10 can be maintained and the stress generated due to deformation of the front half can be released. They may be arranged in other positions, and their number and shape can be changed in various ways.

5 and 6 show another embodiment, and this embodiment differs from the previous embodiment in that the back surface of the plate body 10, which is a tapered surface 22, also has a wavy surface 25 that is wavy toward both edges.
This is what is being formed. In this waveform surface 25,
It is similar to the corrugated surface 21 in that the cooling air circulation holes 11 form peaks and the spaces between the circulation holes 11 form valleys.
The size of the waves on the wavy surface 25 (heights of peaks and troughs) is smaller than that on the wavy surface 21. Since the other configurations are the same, the same reference numerals are given and the explanation will be omitted.

In this example, the area that the cooling air hits is larger due to the corrugated surface 25 than when the tapered surface 22 is a flat surface, so that the cooling effect is further enhanced.

It should be noted that the illustrated embodiment merely represents a preferred example, and it goes without saying that the detailed design may be other than that shown.

This invention is as described above, and includes: - Reducing the amount of deformation of the plate due to the corrugated surface formed on the surface of the front half of the plate body.

・The tapered surface formed on the back of the front half has a cooling effect on the high-temperature heated parts and alleviates the temperature gradient between the front and rear (
Reduction of thermal stress differences caused by equilibration.

- It is possible to reduce the thermal stress difference that occurs due to the reduction of the deformation restraining force of the rear half against the front half due to the edge notch formed on the reinforcing rib, thereby reducing the deformation and cracks that occur in the plate body. It has the excellent effect of minimizing the amount of clinker as much as possible, allowing it to be used for a long period of time without having to temporarily stop the equipment for replacement, and allowing continued uniform cooling of the clinker and smooth transfer of the clinker. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a great plate showing an embodiment of the present invention, FIG. 2 is a rear perspective view of the same, FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 2, and FIG. 2 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is a rear perspective view of a great plate showing another embodiment, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, and FIG. FIG. 8 is a front view showing an example of a clinker cooling device, FIG. 8 is a back view of a conventional grate plate used therein, and FIG. 9 is a sectional view taken along line IX-IX in FIG. 8. 8...Support piece 9...Jaw piece 10...Plate body 11.12...Cooling air circulation hole 13...Reinforcement rib 21.25...Corrugated surface 22...Tapered surface 23. ... Edge cutting notch Patent applicant: Kurimoto Iron Works Co., Ltd. Pattern 1 Pattern 2 Illustration Horse 7 Illustration Horse 9 times

Claims (1)

[Claims] 1. Equipped with a rectangular plate body with a support piece for a mounting bolt approximately at the center of the back surface and a jaw piece on one end edge of the back surface, and between the support piece and the jaw piece of this plate body, A clinker in which a plurality of cooling air circulation holes are bored between the support piece and the other edge, and reinforcing ribs are provided on the other edge of the back surface of the plate body and on both side edges from the other edge to the support piece. In a grate plate for a cooling device, the surface of the plate body between the support piece and the jaw piece is formed into a wavy surface that is wavy toward both side edges, and the back surface of the plate body with this wavy surface is separated from the support piece. What is claimed is: 1. A grate plate having a tapered surface whose wall thickness gradually becomes thinner toward the jaw piece, and having an edge notch formed in the reinforcing rib.