CN202041073U - Rotary kiln grid screen - Google Patents

Abstract

The utility model discloses a rotary kiln grizzly, especially a rotary kiln grizzly for the production line of pellets, which is longer in service life. The rotary kiln grizzly comprises a grizzly body and a protection plate. The protection plate is arranged at the bottom of the grizzly body. The bottom part of the grizzly body is well protected by the protection plate arranged at the bottom of the grizzly body. Therefore, the bottom part of the grizzly body is prevented from being affecting by high temperature, so that the service life of the grizzly is prolonged. A cavity is arranged between the protection plate and the grizzly body, so that the insulation is realized by air. The protection plate can be formed by two side plates, thus is convenient in processing. The grizzly can be provided with a plurality of protection plates and certain spacing is arranged between two adjacent protection plates for compensating dimension changes of the protection plates due to the expansion caused by heat or the contraction caused by cold, thereby achieving a better protection effect. The cavity can also be filled with casting material, so that the protection plate is stabilized and the heat-insulating property is also improved.

Description

Rotary kiln grid screen

technical field

The utility model relates to a rotary kiln grid screen, in particular to a rotary kiln grid screen used in a pellet production line.

Background technique

The rotary kiln is an important equipment in the pellet production line, and it is a high-temperature equipment, and the kiln head grid screen is used to screen out large lumps to prevent the large lumps from hurting the subsequent ring cooler trolley. In production, the bottom of the grid screen is facing the high temperature zone, that is, it is subjected to a high temperature of about 1000 °C, which will cause the oxidation and delamination of the bottom of the grid screen to become thinner, and if it accumulates over time, it will burn through and leak. Because the high temperature will heat the cooling water inside the grid screen, resulting in rapid vaporization of the cooling water, the distribution of cooling water inside the grid screen is not uniform, which makes the temperature of the inside of the grid screen different, and the resulting shrinkage difference causes the grid screen to deform and will The welded joint is pulled open to leak water. Therefore, the traditional grizzly screen has a short service life under the effects of the above two factors, which affects normal production and increases the cost.

Utility model content

The technical problem to be solved by the utility model is to provide a rotary kiln grid screen with a longer service life.

The rotary kiln grid screen adopted by the utility model to solve the technical problem includes a screen body and a protective plate, and the protective plate is arranged at the bottom of the screen body.

Further, a cavity is provided between the protective plate and the bottom surface of the screen body.

Further, the protective plate is composed of two mutually inclined side plates.

Further, the cavity is filled with casting material.

Further, the bottom of the screen body is welded with anchor nails, and the anchor nails are buried in the castable.

Further, there are at least two protective plates along the length direction of the screen body, and the distance between two adjacent protective plates is 5-8mm.

Further, the protective plate is made of stainless steel.

The beneficial effect of the utility model is: by arranging a protective plate at the bottom of the screen body, the bottom part of the screen body is protected by the protective plate, so as to be free from the influence of high temperature, thereby improving the service life. A cavity can also be provided between the protective plate and the screen body, so that air can be used for heat insulation. The protective plate can be composed of two side panels, which facilitates processing. There can be multiple protective plates, and a certain distance is set between adjacent protective plates, so that thermal expansion and contraction can be compensated to achieve a better protection effect. The cavity can also be filled with castables, which can not only stabilize the protective plate, but also improve the thermal insulation performance.

Description of drawings

Fig. 1 is the schematic diagram of the utility model;

Fig. 2 is the A-A line sectional view of Fig. 1;

Parts, parts and numbers in the figure: screen body 1, protective plate 2, cavity 3, side plate 4, anchor nail 5.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in FIG. 1 , the utility model includes a sieve body 1 and a protective plate 2 arranged at the bottom of the sieve body 1 . Protective plate 2 can adopt some temperature-resistant materials. When in use, the bottom of the sieve body 1 faces the kiln head, the high temperature of the rotary kiln will be isolated by the protective plate 2, at least the temperature is buffered by the protective plate 2, such buffering and isolation can avoid the drastic temperature change at the bottom of the sieve body 1, This will not lead to rapid vaporization of the cooling water, thereby avoiding the deformation of the grid screen due to the difference in shrinkage and the leakage of water due to the opening of the welding joint. Due to the heat insulation effect of the protective plate 2, the temperature at the bottom of the sieve body 1 is significantly reduced, thereby weakening the oxidation of the bottom of the sieve body 1 and avoiding burn-through and water leakage.

In order to increase the heat insulation performance of the protective plate 2 , as shown in FIG. 2 , a cavity 3 is provided between the protective plate 2 and the bottom surface of the screen body 1 . The cavity 3 can be realized in the following way: the protective plate 2 is in the shape of an arch or a bridge, and is arranged on the bottom surface of the sieve body 1 to form the cavity 3 . Utilizing the cavity 3 can not only increase the distance between the protective plate 2 and the screen body 1, but also form a layer of air heat insulation, thereby effectively improving the heat insulation performance.

In order to facilitate the processing of the protective plate 2, as shown in FIG. 2, the protective plate 2 is composed of two mutually inclined side plates 4. The mutually inclined side plates 4 and the bottom of the sieve body 1 just form a triangular cavity 3 . The mutually inclined side plates 4 can be formed by one-time bending of the whole plate, or two side plates 4 can be obliquely welded to each other.

As another embodiment of the present invention, as shown in FIG. 2 , the cavity 3 is filled with casting material. Castables can be heat-resistant materials and heat-insulating materials. The castable can assist the protective plate 2 to protect against high temperature. The castable itself can absorb part of the heat, that is, it can absorb the heat of the protective plate 2 to prevent the temperature of the protective plate 2 from being too high, and also has a certain protective effect on the protective plate 2.

In order to make the casting material pour into the cavity 3 firmly, as shown in FIG. 2 , the bottom of the screen body 1 is welded with anchor nails 5 , and the anchor nails 5 are embedded in the casting material. The anchor nails 5 play the role of strengthening the castable, which enables the castable to be more firmly connected to the bottom of the sieve body 1, and also prevents the castable from falling off from the opening of the cavity 3.

Due to the long-term effect of high temperature on the protective plate 2, its long-term shrinkage will damage the joint of the protective plate 2. In order to avoid the above situation and to facilitate the replacement of the broken protective plate 2, as shown in Figure 1, the protective plate 2 along the There are at least two sieve bodies 1 in the length direction, and the interval between two adjacent protective plates 2 is 5-8mm. That is, at this time, multiple columns and rows of protective plates 2 can be set according to the size of the bottom of the screen body 1, and they can be kept at a certain distance, so that the shrinkage of the protective plates 2 can be compensated between the distances, which is beneficial to the use of the protective plates 2.

In order to increase the service life of the protective plate 2, the protective plate 2 is made of stainless steel. This prevents the protective plate 2 from being oxidized at high temperature and increases the service life of the protective plate 2 .

Claims (7)

1. the rotary kiln diagrid comprises sieve nest (1), it is characterized in that: also comprise protective plate (2), described protective plate (2) is arranged on sieve nest (1) bottom.

2. rotary kiln diagrid as claimed in claim 1 is characterized in that: be provided with cavity (3) between described protective plate (2) and sieve nest (1) bottom surface.

3. rotary kiln diagrid as claimed in claim 2 is characterized in that: described protective plate (2) is made of two blocks of side plates (4) that tilt mutually.

4. rotary kiln diagrid as claimed in claim 2 is characterized in that: be filled with in the described cavity (3) and water material feeding.

5. rotary kiln diagrid as claimed in claim 4 is characterized in that: described sieve nest (1) bottom is welded with anchor studs (5), and anchor studs (5) is embedded in and waters in the material feeding.

6. as the described rotary kiln diagrid of the arbitrary claim of claim 1 to 5, it is characterized in that: described protective plate (2) is provided with two at least along sieve nest (1) length direction, and interval 5-8mm between adjacent two protective plates (2).

7. as the described rotary kiln diagrid of the arbitrary claim of claim 1 to 5, it is characterized in that: described protective plate (2) is made by stainless steel.

Images