Novel hot air circulating system of surface drying furnace

Abstract

The utility model discloses a novel hot air circulating system of a surface drying furnace, which comprises a left air duct and a right air duct which are symmetrically arranged on the left side and the right side in a hearth of the surface drying furnace and are positioned above a conveying roller, and a low sand core channel for a low sand core to pass through is formed below the left air duct and the right air duct. A high sand core channel allowing a high sand core to pass through is formed between the left air channel and the right air channel, high-temperature air is introduced into the left air channel and the right air channel, and the high-temperature air can be blown downwards from the bottoms of the left air channel and the right air channel to the low sand core to be used for drying the low sand core. High-temperature air can be blown to the high sand core from the opposite sides of the left air duct and the right air duct to be used for drying the high sand core. According to the sand core drying device, hot air is blown downwards from the top of the low sand core to dry the low sand core, hot air is blown from the left side and the right side of the high sand core to dry the high sand core, the difference of the drying effect of the high sand core and the drying effect of the low sand core caused by the thickness difference of the high sand core and the low sand core is reduced, and the drying effect of the sand cores is improved on the whole.

Description

Technical Field

[0001] This utility model relates to a novel hot air circulation system for a surface drying oven, belonging to the technical field of drying equipment. Background Technology

[0002] Surface drying furnaces are common equipment for drying sand cores, such as... Figure 1 As shown, the existing surface drying furnace structure includes a furnace body and a heating chamber 14. The heating chamber 14 is located above the furnace body, and its bottom is connected to the top of the furnace body. Circulating fans are installed on the left and right sides of the heating chamber. The volutes of the circulating fans are located inside the heating chamber 14, while the motors are located outside the heating chamber. The air inlets of the volutes of the circulating fans on the left and right sides are positioned opposite each other, and their air outlets face downwards. An air distribution plate 23 is installed at the top of the furnace body, with several air holes penetrating its upper and lower sides. In operation, the sand core inside the furnace body is conveyed from front to back. The circulating fans convey the heated air from the heating chamber downwards and blow it through the air holes on the air distribution plate onto the upper surface of the sand core, drying it. The hot air flows upwards as it flows downwards to the bottom of the furnace body and then enters the heating chamber 14 through the air holes, thus circulating the air within the furnace body and the heating chamber. Sand cores are often composed of different parts, which are assembled after drying. For example, a sand core may consist of two low sand cores 5 and one high sand core 7. After drying in a surface drying furnace, they are assembled. The height of the high sand core 7 is greater than that of the low sand core 5, and the width of the high sand core 7 in the left-right direction is about twice the thickness of the low sand core 5. During drying, the two low sand cores 5 are located on both sides of the high sand core 7 and are transported in the furnace. Therefore, the low sand cores 5 and the high sand core 7 are transported in the furnace for the same time, that is, the drying time is the same. Under the premise that both the low sand cores 5 and the high sand core 7 are dried by hot air blowing from the top, the drying effect of the low sand cores 5 and the high sand core 7 is not the same due to their height difference. For example, the low sand cores 5 may be completely dried, while the upper part of the high sand core 7 is dried but the lower part is not dried, resulting in poor overall drying effect of the sand core. If the drying time is increased, the energy consumption will also increase, thus increasing the overall cost of sand core drying. Summary of the Invention

[0003] The purpose of this invention is to provide a novel hot air circulation system for a surface drying furnace, which solves the technical defect that the hot air in the existing surface drying furnace can only blow the sand core from top to bottom to dry the sand core. Since the thickness of the high and low sand cores are different, the drying time is the same, resulting in poor drying effect of the sand core.

[0004] To solve the above problems, the technical solution adopted by this utility model is: a novel hot air circulation system for a surface drying furnace, including a left air duct and a right air duct symmetrically arranged on the left and right sides of the furnace chamber of the surface drying furnace and located above the conveying rollers. A low sand core channel for low sand cores is formed below the left and right air ducts, and a high sand core channel for high sand cores is formed between the left and right air ducts. High-temperature air is introduced into the left and right air ducts. The high-temperature air can be blown downward from the bottom of the left and right air ducts towards the low sand cores to dry them, and the high-temperature air can be blown from the opposite side of the left and right air ducts towards the high sand cores to dry them. In this invention, for low-sand cores, hot air is blown downwards from the top to dry them, while for high-sand cores, hot air is blown simultaneously from both sides to dry them. This reduces the difference in drying effect between high-sand cores and low-sand cores caused by the thickness difference, and improves the overall drying effect of the sand cores. In this invention, high-sand cores are easier to dry, and compared with the prior art, this invention also reduces the energy consumption of sand core drying.

[0005] As a further improvement of this utility model, downward air nozzles are provided at the bottom of the left and right air ducts, and intermediate air nozzles are provided on the opposite side of the left and right air ducts. This utility model uses the downward air nozzles to blow air and dry the low sand core located below them, while the air blown from the opposite side of the intermediate air nozzles blows air from both sides of the high sand core simultaneously, thus drying the high sand core.

[0006] As a further improvement of this utility model, both the left and right air ducts include a horizontal section and a vertical section. One end of the horizontal section is fixed to the inner wall of the surface drying furnace, and the top end of the vertical section is fixed to and connected to the other end of the horizontal section. A downward air nozzle is located at the bottom of the horizontal section, and a middle air nozzle is located on the side of the vertical section away from the horizontal section. The left and right air ducts in this utility model are generally L-shaped, which facilitates the setting of the downward and middle air nozzles and allows for more accurate control of the direction of hot air blowing.

[0007] As a further improvement of this utility model, a heating chamber is provided at the top of the surface drying furnace body. A burner is installed inside the heating chamber, and the heating chamber is connected to the furnace body. A left circulating fan and a right circulating fan are respectively installed on the left and right sides of the heating chamber. The left and right circulating fans are used to introduce the air heated by the burner inside the heating chamber into the left and right air ducts, respectively, to dry the high-strength and low-strength sand cores. Simultaneously, the air inside the furnace chamber flows upwards into the heating chamber and is heated by the burner. This utility model provides a heating chamber at the top of the surface drying furnace body, facilitating air heating, and utilizes the left and right circulating fans to deliver the heated air into the left and right air ducts, thus promoting overall air circulation.

[0008] As a further improvement of this utility model, the surface drying furnace has a vent on its body to discharge moisture from the furnace chamber, and an air inlet on its heating chamber to supply air to the heating chamber. The vent in this utility model facilitates the discharge of moisture generated during sand core drying, ensuring dryness within the surface drying furnace and heating chamber, and further improving the drying effect of the sand cores.

[0009] As a further improvement of this utility model, a first air guide plate is provided at the bottom of the furnace chamber of the surface drying furnace. The left and right sides of the first air guide plate are bent downwards and fixed to the bottom of the furnace body. The first air guide plate is arranged along the length of the furnace body and is located below the passage of the high-sand core. With the first air guide plate, the hot air blown downwards in the furnace body of this utility model flows upwards to the heating chamber after reaching the bottom of the furnace. The first air guide plate directs the hot air to flow upwards and to both sides, minimizing direct airflow onto the tray at the bottom of the high-sand core and promoting better circulation of hot air.

[0010] As a further improvement of this utility model, second air guide plates are provided on the left and right sides of the bottom of the surface drying furnace. These second air guide plates are inclined, with their bottom ends fixed to the bottom surface of the surface drying furnace and their top ends fixed to the side wall of the furnace. By providing these second air guide plates, the angle at the bottom of the surface drying furnace is increased, which is more conducive to the hot air being blown between the left and right air ducts, further facilitating air circulation.

[0011] As a further improvement of this invention, limiting components are provided on the conveyor roller at both the low-sand core channel and the high-sand core channel. These limiting components are used to limit the trays holding the low-sand cores and high-sand cores to be dried in the left-right direction. This invention provides limiting components on the conveyor roller to limit the left-right movement of the low-sand cores and high-sand cores during conveying by limiting the trays at the bottom of the low-sand cores and high-sand cores in the left-right direction.

[0012] As a further improvement of this utility model, each limiting component includes two limiting rings, both of which are sleeved on and fixed to the conveyor roller. The distance between the two limiting rings is greater than or equal to the width of the tray on which the low-grade and high-grade sand cores to be dried are placed. The limiting component in this utility model consists of two limiting rings, which limit the tray from both sides. The structure is simple and does not interfere with the rotation of the conveyor roller.

[0013] As a further improvement of this utility model, the downward air nozzle and the middle air nozzle are through holes stamped on the left and right air ducts, respectively. The fact that the downward air nozzle and the middle air nozzle are through holes stamped in this utility model makes the manufacture of the left and right air ducts more convenient and the overall structure simpler.

[0014] In summary, the beneficial effects of this utility model are as follows: By improving the hot air circulation system of the surface drying furnace, the low-grade sand core is still dried by blowing hot air from the top, while the high-grade sand core is dried by blowing hot air from both sides simultaneously. This accelerates the drying speed of the high-grade sand core and reduces the difference in drying effect between the high-grade and low-grade sand cores, thereby ensuring the overall drying effect of the sand core. This utility model reduces energy consumption while ensuring the overall drying effect of the sand core. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the existing technology.

[0016] Figure 2 This is a schematic diagram of the structure of this utility model.

[0017] The components are as follows: 1. Furnace chamber; 2. Conveying roller; 3. Left air duct; 4. Right air duct; 5. Low sand core; 6. Low sand core channel; 7. High sand core; 8. High sand core channel; 9. Downward air nozzle; 10. Middle air nozzle; 11. Horizontal section; 12. Vertical section; 13. Surface drying furnace body; 14. Heating chamber; 15. Burner; 16. Left circulating fan; 17. Right circulating fan; 18. Air inlet; 19. First air guide plate; 20. Second air guide plate; 21. Limiting ring; 22. Drive motor; 23. Air distribution plate. Detailed Implementation

[0018] like Figure 2 The novel hot air circulation system for a surface drying furnace is shown and is used on the furnace. The furnace includes a furnace body 13 with a rectangular longitudinal section. The structure of the furnace body 13 is existing technology. The furnace body 13 contains a furnace chamber 1 with a feed inlet at one end and a discharge outlet at the other. Several conveying rollers 2 are installed inside the furnace chamber 1. Both ends of the conveying rollers 2 are rotatably connected to the furnace body 13, and one end of the conveying rollers 2 extends beyond the furnace body 13. A drive motor 22 is installed on the outside of the furnace body 13 to drive the conveying rollers 2 to rotate. The rotation of the conveying rollers 2 is used to transport sand cores during use. The structure of the drive motor 22 driving the conveying rollers 2 is existing technology and will not be described in detail in this invention.

[0019] like Figure 2As shown, the novel hot air circulation system of the surface drying furnace includes a left air duct 3 and a right air duct 4 symmetrically arranged on the left and right sides of the furnace chamber 1 of the surface drying furnace and located above the conveyor roller 2. A low-sand core channel 6 is formed between the left air duct 3 and the right air duct 4 and the conveyor roller 2 for the passage of low-sand core 5. A high-sand core channel 8 is formed between the left air duct 3, the right air duct 4 and the conveyor roller 2 for the passage of high-sand core 7. High-temperature air is introduced into the left air duct 3 and the right air duct 4. This high-temperature air can be blown downwards from the bottom of the left air duct 3 and the right air duct 4 towards the low-sand core 5 to dry it, and can also be blown from the opposite side of the left air duct 3 and the right air duct 4 towards the high-sand core 7 to dry it. Figure 2 As shown, the low sand core 5 and the high sand core 7 in this utility model are relative. Among the sand cores transported side by side, the middle sand core is taller than the sand cores on both sides. The sand core with the larger middle height is the high sand core 7, and the sand cores with the smaller height on both sides are the low sand core 5.

[0020] like Figure 2 As shown, the present invention has downward air nozzles 9 at the bottom of the left air duct 3 and the right air duct 4. The high-temperature air in the left air duct 3 and the right air duct 4 is blown downward from the left air duct 3 and the right air duct 4 through the downward air nozzles 9 and blown towards the low sand core 5. The right surface of the left air duct 3 and the left surface of the right air duct 4 are provided with intermediate air nozzles 10, so that the high-temperature air in the left air duct 3 can be blown to the right towards the high sand core 7, and the high-temperature air in the right air duct 3 can be blown to the left towards the high sand core 7.

[0021] like Figure 2 As shown, both the left air duct 3 and the right air duct 4 in this invention include a horizontal section 11 and a vertical section 12. One end of the horizontal section 11 is fixed to the inner wall of the surface drying furnace, and the top surface of the horizontal section 11 is fixed to the inner surface of the top of the surface drying furnace body 13. The end of the horizontal section 11 away from the vertical section 12 is fixed to the side wall of the surface drying furnace body 13. The top end of the vertical section 12 is fixed to and connected to the other end of the horizontal section 11. A downward air nozzle 9 is disposed at the bottom of the horizontal section 11, and a middle air nozzle 10 is disposed on the side of the vertical section 12 away from the horizontal section 11. The downward air nozzle 9 and the middle air nozzle 10 in this invention are through holes stamped on the left air duct 3 and the right air duct 4.

[0022] like Figure 2As shown, a heating chamber 14 is provided at the top of the surface drying furnace body 13. The bottom of the heating chamber 14 is connected to the top of the surface drying furnace body 13. Specifically, the heating chamber 14 has a bottomless structure. A through hole is opened at the top of the surface drying furnace body 13, and the heating chamber 14 is located directly above the through hole, so that the through hole at the top of the surface drying furnace body 14 is connected to the opening at the bottom of the heating chamber 14. A burner 15 is provided in the heating chamber 14, and a burner fire channel is provided in the heating chamber 14 along the front-to-back direction and connected to the burner 15. A left circulating fan 16 and a right circulating fan 17 are respectively provided on the left and right sides of the heating chamber 14. The volutes of the left circulating fan 16 and the right circulating fan 17... The shell is located inside the heating chamber 14. The burner 15 is located between the air inlets of the volutes of the left circulating fan 16 and the right circulating fan 17. The air outlets of the volutes of the left circulating fan 16 and the right circulating fan 17 are connected to the top of the left air duct 3 and the right air duct 4, respectively. They are used to introduce the air heated by the burner 15 in the heating chamber 14 into the left air duct 3 and the right air duct 4, and blow it out from the middle air nozzle 10 and the downward air nozzle 9 of the left air duct 3 and the right air duct 4 to dry the high sand core 7 and the low sand core 5. At the same time, the air in the furnace chamber 1 of the surface drying furnace flows upward into the heating chamber 14 and is heated by the burner 15, realizing the circulation of air between the furnace body 13 of the surface drying furnace and the heating chamber 14.

[0023] During the drying process, the moisture generated by the high-sand core 7 and low-sand core 5 inside the surface drying furnace body 13 needs to be discharged from the furnace body 13 in a timely manner. Therefore, this invention provides a moisture discharge port (not shown in the figure) on the furnace body 13. This moisture discharge port can be located at the top of the furnace body 13, offset from the heating chamber 14, to discharge moisture from the furnace chamber 1. While the furnace body 13 is discharging moisture, the air volume and pressure inside the furnace body 13 decrease. Therefore, this invention provides an air supply port 18 on the heating chamber 14 to supply air into the heating chamber 14, thereby balancing the air pressure inside the furnace body 13 and the heating chamber 14. This invention places the air supply port 18 at the front or rear end of the heating chamber 14 shell, with the air supply port 18 located at the lower part of the heating chamber 14. Figure 2 As shown.

[0024] like Figure 2As shown, this invention provides a first air guide plate 19 at the bottom of the furnace chamber 1 of the surface drying furnace. The left and right sides of the first air guide plate 19 are bent downwards and its bottom end is fixed to the bottom of the furnace body 13. The longitudinal section of the first air guide plate 19 is an isosceles trapezoidal shape. The length direction of the first air guide plate 19 is consistent with the length direction of the furnace body 13, that is, the first air guide plate 19 is set along the front-back direction of the furnace body. In the use state, the first air guide plate 19 is located below the passage of the high sand core 7, that is, the first air guide plate 19 is located in the center of the bottom of the furnace chamber 1. This invention also provides second air guide plates 20 on the left and right sides of the bottom of the furnace chamber 1 of the surface drying furnace. The second air guide plates 20 are inclined and their bottom ends are fixed to the bottom surface of the furnace body 13, and their top ends are fixed to the side wall of the furnace body 13.

[0025] like Figure 2 As shown, this invention provides limiting components on the conveyor roller 2 at both the low sand core channel 6 and the high sand core channel 8. These limiting components are used to limit the left and right directions of the trays containing the low sand cores 5 and high sand cores 7 to be dried. Each limiting component in this invention includes two limiting rings 21, both of which are sleeved on and fixed to the conveyor roller 2. The distance between the two limiting rings 21 is greater than or equal to the width of the tray containing the low sand cores 5 and high sand cores 7 to be dried. Optimally, this invention sets the distance between the two limiting rings 21 to be slightly greater than the width of the tray containing the low sand cores 5 and high sand cores 7 to be dried, thus providing both left and right limiting of the trays and facilitating tray placement.

[0026] This utility model has a heating chamber 14 at each of the front and rear ends of the top of the surface drying furnace body 13. The two heating chambers have the same structure. The dehumidification port is opened on the surface drying furnace body 13 between the two heating chambers 14. The number of dehumidification ports can be one or more, and a dehumidification pipe is used to connect to the outside of the workshop during use.

[0027] Unless otherwise specified in the above description, all parts are existing technology or can be implemented using existing technology. Furthermore, the specific embodiments described in this utility model are merely preferred embodiments of the invention and are not intended to limit the scope of this utility model. That is, all equivalent changes and modifications made within the scope of this utility model patent should be considered within the technical scope of this utility model.

Claims

1. A novel hot air circulation system for a flash dryer, characterized by: The left air duct and the right air duct are symmetrically arranged on the left and right sides of the hearth of the surface drying furnace and above the conveying roller, a low sand core passage for the low sand core is formed below the left air duct and the right air duct, a high sand core passage for the high sand core is formed between the left air duct and the right air duct, high-temperature air is introduced into the left air duct and the right air duct, the high-temperature air can be blown downward from the bottom of the left air duct and the right air duct to the low sand core for drying the low sand core, and the high-temperature air can be blown to the high sand core from the side of the left air duct and the right air duct facing each other for drying the high sand core.

2. The novel hot air circulation system for the drying oven as claimed in claim 1, wherein: The bottom of the left air duct and the right air duct is provided with a downward air nozzle, and the side of the left air duct and the right air duct facing each other is provided with an intermediate air nozzle.

3. The novel hot air circulation system for the drying oven of claim 2, wherein: The left air duct and the right air duct each include a horizontal section and a vertical section, one end of the horizontal section is fixed to the inner wall of the surface drying furnace, the top end of the vertical section is fixed to the other end of the horizontal section and is in communication, the downward air nozzle is arranged at the bottom of the horizontal section, and the intermediate air nozzle is arranged on the side of the vertical section away from the horizontal section.

4. The new hot air circulation system of the drying oven according to claim 1 or 2 or 3, characterized in that: A heating chamber is arranged on the top of the furnace body of the surface drying furnace, a burner is arranged in the heating chamber, and the heating chamber is in communication with the furnace body, left and right circulating fans are arranged on the left and right sides of the heating chamber, respectively, the left and right circulating fans are used to introduce the air heated by the burner in the heating chamber into the left air duct and the right air duct, respectively, to dry the high sand core and the low sand core, and at the same time, the air in the hearth of the surface drying furnace flows upward into the heating chamber and is heated by the burner.

5. The novel hot air circulation system for the drying oven as claimed in claim 4, wherein: A moisture discharge port is arranged on the furnace body of the surface drying furnace for discharging the moisture in the hearth, and an air supplement port is arranged on the heating chamber for supplementing air into the heating chamber.

6. The novel hot air circulation system for the drying oven of claim 4, wherein: A first air guide plate is arranged at the bottom of the hearth of the surface drying furnace, the left and right sides of the first air guide plate are bent downward and fixed to the bottom of the furnace body, the first air guide plate is arranged along the length direction of the furnace body, and the first air guide plate is below the high sand core passage.

7. The novel hot air circulation system for the drying oven of claim 6, wherein: Second air guide plates are arranged on the left and right sides of the bottom of the hearth of the surface drying furnace, the second air guide plates are arranged obliquely, the bottom end of the second air guide plate is fixed to the bottom surface of the surface drying furnace, and the top end of the second air guide plate is fixed to the side wall of the surface drying furnace.

8. The novel hot air circulation system for the drying oven of claim 1, wherein: Limiting members are arranged on the conveying roller at the low sand core passage and the high sand core passage, the limiting members are used to limit the tray placing the low sand core and the high sand core to be dried in the left and right directions.

9. The novel hot air circulation system for the drying oven of claim 8, wherein: Each limiting member includes two limiting rings, the two limiting rings are sleeved on the conveying roller and are fixed to the conveying roller, and the distance between the two limiting rings is greater than or equal to the width of the tray placing the low sand core and the high sand core to be dried.

10. The novel hot air circulation system for the drying oven as claimed in claim 2, wherein: The downward air nozzle and the intermediate air nozzle are through holes punched on the left air duct and the right air duct.

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