Preheating structure of roller kiln

Abstract

The utility model discloses a roller kiln preheating structure in the technical field of roller kiln preheating, which comprises a kiln body, a preheating box is arranged at an inlet of the kiln body, a waste heat pipe with a built-in induced draft fan is arranged at the top of the kiln body, and the waste heat pipe is communicated with the preheating box. The lower end of the first branch pipe penetrates into the top of the preheating box and communicates with a third branch pipe, and the lower end of the third branch pipe is provided with an air outlet nozzle discharging air downwards. Air outlet side grooves are formed in the front side wall and the rear side wall of the preheating box correspondingly, and the lower ends of the second branch pipes communicate with the air outlet side grooves. The interior of a car body of the kiln car is hollow, air inlet side grooves are formed in car shells on the front side and the rear side of the kiln car, and the air inlet side grooves correspond to the air outlet side grooves of the preheating box in position. And an arc-shaped drainage plate is arranged in the middle in the kiln car. According to the utility model, through bidirectional cooperative preheating of the top nozzle and the cavity at the bottom of the kiln car and a directional flow guide structure of the arc-shaped flow guide plate, three-dimensional uniform preheating of ceramic products is realized, and the subsequent roasting effect is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of roller kiln preheating technology, and in particular to a roller kiln preheating structure. Background Technology

[0002] Roller kilns, as modern continuous firing thermal equipment, occupy an important position in the firing production of ceramic products and are also widely used in metallurgical industries such as abrasives. In the firing process of ceramic products, the preheating stage before firing in the kiln is indispensable. Good preheating allows the product to better withstand high temperatures during firing, improving the firing quality.

[0003] Currently, most existing roller kiln preheating structures employ top-blowing preheating. While this method achieves preheating to some extent, it has significant shortcomings. Because the air is blown from the top, heat distribution is uneven, making it difficult to cover all parts of the product, resulting in uneven preheating. Uneven preheating directly affects subsequent firing, potentially leading to quality problems such as cracks and deformation, reducing product yield and quality stability. Therefore, developing a roller kiln preheating structure that achieves uniform preheating is particularly urgent. Utility Model Content

[0004] The main objective of this invention is to provide a preheating structure for roller kilns to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A roller kiln preheating structure includes a kiln body, a preheating box at the kiln inlet, and a waste heat pipe with a built-in induced draft fan at the top of the kiln body, connected to the preheating box. A first branch pipe is connected to the lower side of the waste heat pipe, and second branch pipes are connected to both the front and rear sides of the waste heat pipe. The lower end of the first branch pipe extends into the top of the preheating box and connects to a third branch pipe, with a downward-facing air outlet nozzle at the lower end of the third branch pipe. Air outlet grooves are formed on both the front and rear side walls of the preheating box, and the lower ends of the second branch pipes connect to these grooves. A track is provided at the bottom of the kiln body, extending into the preheating box. Kiln cars are mounted on the track. The interior of the kiln car is hollow, and air inlet grooves are formed on both the front and rear sides of the car body, corresponding to the air outlet grooves of the preheating box. An arc-shaped guide plate is centrally located inside the kiln car. A load-bearing mesh plate is installed on the top of the kiln car.

[0007] Furthermore, there are two diversion plates, with the concave surface of each diversion plate facing the air inlet side slot on the same side.

[0008] Furthermore, a vertical support column is installed between the two drainage plates.

[0009] Furthermore, wheels are installed under the kiln car's shell, and the wheels cooperate with the track.

[0010] This invention also includes other components that enable the preheating structure of the roller kiln to function properly, and these devices or components all employ conventional techniques in the art. Furthermore, devices and components not specified in this invention all employ conventional techniques in the art, such as the induced draft fan and exhaust nozzles mentioned in this application. In specific implementation, appropriate equipment or component models can be selected according to the specific working scenario.

[0011] The working principle of this invention is as follows: When the kiln car carrying the product to be preheated enters the preheating box along the track, the waste heat pipe transports the waste heat from the kiln body to the preheating box through the built-in induced draft fan. Hot air is transported through the first branch pipe to the third branch pipe, forming a downward airflow through the top air outlet nozzle to preheat the product from the top; simultaneously, hot air is transported through the second branch pipe to the air outlet side slots on the front and rear sides of the preheating box, and through corresponding connections with the air inlet side slots of the kiln car, the hot air enters the internal cavity of the kiln car. Under the guidance of the arc-shaped guide plate, the hot air changes its airflow direction, forming an upward airflow along the concave surface of the guide plate, and finally blows evenly upward from the bottom of the carrying mesh plate, achieving three-dimensional preheating of the bottom and sides of the product. The synergistic effect of the top nozzle and the bottom airflow, combined with the continuous movement of the kiln car, forms a continuous and stable bidirectional preheating environment.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Achieve three-dimensional bidirectional preheating: Through the synergistic effect of the downward airflow formed by the top air outlet nozzle and the upward airflow inside the kiln car cavity, three-dimensional preheating of the product at the top, bottom and sides is achieved, effectively improving the uniformity of preheating.

[0014] 2. Optimize airflow distribution: Through the guiding effect of the arc-shaped deflector plate and the uniform blowing structure at the bottom of the load-bearing mesh plate, the hot air forms a stable upward airflow, avoiding uneven preheating caused by local temperature differences.

[0015] 3. Improve preheating continuity: By combining the continuous movement of the kiln car with bidirectional preheating, a stable and uniform continuous preheating environment is formed, ensuring the temperature consistency of the product before it enters the kiln for firing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 For along Figure 1 A cross-sectional view along the AA direction.

[0018] Figure 3 This is a cross-sectional view of the kiln car of this utility model.

[0019] In the diagram: 1. Kiln body; 2. Waste heat pipe; 21. First branch pipe; 22. Second branch pipe; 23. Third branch pipe; 3. Preheating box; 31. Air outlet side sluice; 32. Air outlet nozzle; 4. Track; 5. Kiln car; 6. Exhaust fan; 7. Car shell; 8. Air inlet side sluice; 9. Loading mesh plate; 10. Support column; 11. Guide plate; 12. Wheel. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Example:

[0022] like Figures 1-3 As shown, a roller kiln preheating structure includes a kiln body 1, a preheating box 3 at the inlet of the kiln body 1, and a waste heat pipe 2 with a built-in induced draft fan 6 at the top of the kiln body 1, which is connected to the preheating box 3. A first branch pipe 21 is connected to the lower side of the waste heat pipe 2, and second branch pipes 22 are connected to both the front and rear sides of the waste heat pipe 2. The lower end of the first branch pipe 21 extends into the top of the preheating box 3 and is connected to a third branch pipe 23, with a downward-facing air outlet nozzle 32 at the lower end of the third branch pipe 23. Air outlet side grooves 31 are formed on both the front and rear side walls of the preheating box 3, and the lower ends of the second branch pipes 22 are connected to the air outlet side grooves 31. A track 4 is provided at the bottom of the kiln body 1, extending into the preheating box 3. A kiln car 5 is mounted on the track 4. The interior of the kiln car 5 is hollow, and air inlet side grooves 8 are formed on both the front and rear sides of the car body 7, corresponding to the positions of the air inlet side grooves 31 of the preheating box 3. An arc-shaped guide plate 11 is centrally located inside the kiln car 5. A load-bearing mesh plate 9 is installed on the top of the kiln car 5.

[0023] Specifically, there are two baffles 11, with the concave surface of each baffle 11 facing the air inlet side groove 8 on the same side.

[0024] In addition, a vertical support column 10 is provided between the two guide plates 11. Wheels 12 are provided under the car body 7 of the kiln car 5, and the wheels 12 cooperate with the track 4.

[0025] The working principle of this utility model's roller kiln preheating structure is as follows: When the kiln car 5, carrying the product to be preheated, enters the preheating box 3 along the track 4, the waste heat pipe 2 transports the waste heat from the kiln body 1 to the preheating box 3 through the built-in induced draft fan 6. Hot air is transported through the first branch pipe 21 to the third branch pipe 23, forming a downward airflow through the top air outlet nozzle 32 to preheat the product from the top; simultaneously, hot air is transported through the second branch pipe 22 to the air outlet side slots 31 on the front and rear sides of the preheating box 3, and through corresponding communication with the air inlet side slots 8 of the kiln car 5, the hot air enters the internal cavity of the kiln car 5. Under the guidance of the arc-shaped guide plate 11, the hot air changes its airflow direction, forming an upward airflow along the concave surface of the guide plate 11, and finally blows evenly upward from the bottom of the carrying mesh plate 9, achieving three-dimensional preheating of the product's bottom and sides. The synergistic effect of the top nozzle 32 and the bottom airflow, combined with the continuous movement of the kiln car 5, forms a continuous and stable bidirectional preheating environment.

[0026] The above embodiments are merely descriptions of preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope of the present utility model.

Claims

1. A preheating structure for a roller kiln, comprising a kiln body (1), a preheating box (3) provided at the inlet of the kiln body (1), and a waste heat pipe (2) with a built-in induced draft fan (6) provided at the top of the kiln body (1), the waste heat pipe (2) being connected to the preheating box (3), characterized in that: The waste heat pipe (2) is connected to a first branch pipe (21) on its lower side, and the waste heat pipe (2) is connected to a second branch pipe (22) on both its front and rear sides; the lower end of the first branch pipe (21) passes through the top of the preheating box (3) and is connected to a third branch pipe (23), and the lower end of the third branch pipe (23) is provided with a downward air outlet nozzle (32); the front and rear side walls of the preheating box (3) are provided with air outlet side grooves (31), and the lower end of the second branch pipe (22) is connected to the air outlet side grooves (31); the kiln body ( 1) A track (4) is provided at the bottom, and the track (4) extends into the preheating box (3); a kiln car (5) is provided on the track (4); the interior of the kiln car (5) is hollow, and air inlet side slots (8) are provided on the front and rear sides of the kiln car (5), and the air inlet side slots (8) correspond to the air outlet side slots (31) of the preheating box (3); an arc-shaped guide plate (11) is provided in the center of the kiln car (5); a load-bearing mesh plate (9) is provided on the top of the kiln car (5).

2. The roller kiln preheating structure according to claim 1, characterized in that: The number of the guide plates (11) is two, and the concave surface of each guide plate (11) is directly opposite the air inlet side groove (8) on the same side.

3. The roller kiln preheating structure according to claim 2, characterized in that: A vertical support column (10) is provided between the two guide plates (11).

4. The roller kiln preheating structure according to claim 1, characterized in that: The kiln car (5) has wheels (12) installed below its shell (7), and the wheels (12) cooperate with the track (4).

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