JPH0420865B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a grate plate for a clinker cooling device attached to a rotary kiln of a cement production facility, and more particularly to a Fuller type grate plate.

BACKGROUND ART FIG. 7 shows an example of a clinker cooling device equipped with this type of grate plate. In this cooling device, a 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. . 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 moved by the reciprocating movement of the movable grate plate 102. The air is transferred in the direction of the arrow, and during this transfer, cooling air is supplied from below the grate plate to the clinker 101 through the distribution holes in the grate plate to be 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;
07 is T bolt.

Recently, plates such as those shown in FIGS. 8 and 9 have been used as the above-mentioned great plates. These great plates 102, 103 have a support piece 108 for a T-bolt 107 approximately in the center of the back surface.
However, the plate body 110 has a longitudinal shape and has a jaw piece 109 on one end edge of the back surface. A plurality of cooling air circulation holes 111 and 112 are formed between the support piece 108 and the jaw piece 109 of the plate body 110 and between the support piece 108 and the other end edge. Also, the other end edge of the back surface of the plate body 110, both side edges and the center part from the other end edge to the support piece 108, and the jaw piece 1 from the support piece 108.
Reinforcement ribs 113, 113' are provided on both side edges and the center of the support piece 108 to increase rigidity.
It is continuously provided in contact with the jaw piece 109. Reference numeral 114 indicates a cooling air circulation hole formed in the jaw piece 109.

Problems to be Solved by the Invention By the way, in the above-mentioned great plate,
There is a large variation in temperature between the front half (between the support piece 108 and the jaw piece 109) and the rear half (between the support piece 108 and the reinforcing rib 113 provided on the other edge) of the surface to be used. That is, the front half of the surface and jaw piece 1
Since 09 is always in contact with the high temperature clinker 101, it receives the most heat, and the temperature difference between the front and back surfaces is also large, so the difference in elongation between the front and back surfaces becomes large.
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 as large as in the first half.

Due to the generation of the thermal stress difference between the first half and the second half, the great plates 102, 10
3, deformation and cracks are likely to occur. In particular, since reinforcing ribs 113 are continuously provided to strengthen the rigidity of the great plate, this may cause cracks during cooling, mainly in the weak flat plate portions where the circulation holes 111 and 112 are provided. This has resulted in the occurrence of such problems.

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

Therefore, this 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, and
The purpose of the present invention is to provide a grate plate that is less susceptible to deformation and cracking and can be used for a long period of time.

Means for Solving the Problems In order to achieve the above object, the present invention provides the following features:
As shown in Figure 4, the surface of the plate body 10 between the support piece 8 and the jaw piece 9 is formed into a waveform surface 21 that is waveformed toward both side edges, and the back surface of the plate body 10 with this waveform surface 21 is Support piece 8 to jaw piece 9
A tapered surface 22 whose wall thickness gradually becomes thinner toward
and an edge notch 2 is formed in the reinforcing rib 13.
3 is formed.

Function As described above, since the front surface of the plate main body 10, which is the heated side, is formed into the corrugated surface 21, the surface area of the front surface is larger than that of 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 actual deformation in unit length (length in the width direction) becomes small.

In addition, since the back surface is formed into a tapered surface 22, the side of the jaw piece 9 that tends to get hotter has a better cooling effect due to the cooling air from below, and the temperature difference between the front and back surfaces in the front half of the plate body 10 is small. At the same time, the temperature difference between the first half and the second half becomes smaller, and the temperature difference when heating and cooling are repeated also becomes smaller. Therefore, it becomes 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 accordingly.

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

Example An example will be described below with reference to the drawings, focusing on configurations other than those described above.

In FIGS. 1 to 4, the wavy surface 21 has the cooling air circulation holes 11 as peaks, and the circulation holes 11 and 11
The waveform has valleys in between.

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 so that T>t.

In addition, in this embodiment, reinforcing ribs 113' as shown in conventional FIGS.
Similarly, the jaw piece 9 is not provided with cold leg 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. It may be installed in any other location,
Moreover, the number and shape of the elements 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, is also formed into a wavy surface 25 that is wavy toward both side edges. It is forming. In this corrugated surface 25, cooling air circulation holes 1
It is the same as the waveform surface 21 in that 1 becomes a peak and the area between the communication holes 11 becomes a valley, but the size of the waves on the waveform surface 25 (the height of the peak and valley) is It is smaller than that of the waveform surface 21. Since the other configurations are the same, the same reference numerals will be given and the explanation will be omitted.

In this case, 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 illustrated.

Effects of the Invention This invention is as described above, and has the following features: - 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; ● High-temperature heated area due to the tapered surface formed on the back surface of the front half. ● Reducing the difference in thermal stress caused by the cooling effect on the front and rear parts and alleviating (balancing) the temperature gradient between the front and rear parts, and reducing the deformation restraining force of the rear part on the front part due to the edge notch formed in the reinforcing rib. It is possible to reduce the thermal stress difference that occurs, thereby minimizing deformation and cracks that occur in the plate body, and eliminating the need to temporarily stop the equipment for replacement. It has the excellent effect of being able to be used for a long period of time without any problems, and that it can continue to cool the clinker evenly and transport it smoothly.

[Brief explanation of drawings]

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. 4 is a perspective view of the grate plate shown in Fig. 2. FIG. 5 is a rear perspective view of the great plate showing another embodiment; FIG.
The figure is a sectional view taken along the - line in Figure 5, Figure 7 is a front view showing an example of a clinker cooling device, Figure 8 is a back view of a conventional grate plate used in it, and Figure 9 is a cross-sectional view of Figure 8. - is a sectional view taken along the line. 8... Support piece, 9... Jaw piece, 10... Plate body, 11, 12... Cooling air circulation hole, 13...
... Reinforcement rib, 21, 25 ... Waveform surface, 22 ... Tapered surface, 23 ... Edge notch.

Claims (1)

[Claims] 1 Equipped with a rectangular plate body with a support piece for a mounting bolt approximately in 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 and the support piece. A clinker cooling system in which a plurality of cooling air circulation holes are bored between one 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 sides from the other edge to the support piece. In the device grate plate,
The surface of the plate body between the support piece and the jaw piece is formed into a waveform surface that is waveform toward both side edges,
The back surface of the plate main body having the corrugated surface is formed into a tapered surface whose wall thickness gradually becomes thinner from the support piece to the jaw piece, and an edge notch is formed in the reinforcing rib. Great plate.