A regenerable coated sand roasting furnace combustion chamber

Abstract

This utility model discloses a combustion chamber for a regenerable coated sand roasting furnace, comprising a combustion chamber body, multiple burners at the top of the combustion chamber body, a conveying shaft with bearings inside the combustion chamber body, and a drive structure in cooperation with the conveying shaft. The conveying shaft has spiral conveying blades, and both ends of the conveying shaft extend outward to the outside of the combustion chamber body, with conveying grooves formed therein. A medium conveying pipe is connected to the conveying grooves via sealed bearings. A heat exchange chamber is provided on the spiral conveying blades, communicating with the conveying grooves. A sand storage box is located at the top of the combustion chamber body, and a sand drop control structure is provided between the bottom of the sand storage box and the combustion chamber body. A medium conveying pipe at the output end is spirally wound around the outside of the sand storage box to form a preheating section. This utility model can preheat the sand core to be coated, while improving the fullness and uniformity of heating.

Description

Technical Field

[0001] This utility model relates to the field of coated sand processing technology, and more specifically, it relates to a combustion chamber of a regenerable coated sand roasting furnace. Background Technology

[0002] Coated sand is a precision casting material with a resin film coated on the surface of quartz sand, exhibiting excellent formability and strength. Its manufacturing process involves mixing thermosetting phenolic resin with sand particles and heating the mixture, causing the resin to melt and uniformly coat the sand particles. Upon cooling, a solid coating is formed. Coated sand cures rapidly at high temperatures, resulting in castings with high surface finish and good dimensional accuracy. It is widely used in the production of precision castings in industries such as automobiles and machinery, and is particularly suitable for manufacturing complex thin-walled castings, effectively reducing casting defects such as sand adhesion and porosity.

[0003] During the production and processing of coated sand, the sand core needs to be heated through a combustion chamber. Existing combustion chambers mainly use combustible gas burned by burners to heat the sand core inside the combustion chamber. However, burners are usually arranged in single or multiple points, resulting in uneven temperature distribution in the combustion chamber. The area near the burner has a higher temperature, while the area far away is underheated, which easily leads to poor heating uniformity of the sand core during heating.

[0004] Furthermore, the way the burner heats the sand core by burning combustible gas tends to make the surface of the sand core hotter, while the internal sand core is heated more limitedly, resulting in poor uniformity of heating inside and outside the sand particles. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the problems existing in the prior art, this utility model provides a combustion chamber for a regenerated coated sand roasting furnace, which solves the technical problem mentioned in the background art that the combustion chamber of the regenerated coated sand roasting furnace mainly heats the coated sand by burning combustible gas in the burner, resulting in poor heating effect and heating uniformity of the coated sand.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A combustion chamber for a regenerable coated sand roasting furnace includes a combustion chamber body. Multiple burners are installed at the top of the combustion chamber body. A conveying shaft is installed inside the combustion chamber body via bearings, and a drive structure is provided in conjunction with the conveying shaft. Spiral conveying blades are installed on the conveying shaft. Both ends of the conveying shaft extend outward to the outside of the combustion chamber body and have conveying grooves. A medium conveying pipe is connected to the conveying grooves via sealed bearings. A heat exchange chamber is provided on the spiral conveying blades and communicates with the conveying grooves. A sand storage box is installed at the top of the combustion chamber body. A sand drop control structure is provided between the bottom of the sand storage box and the combustion chamber body. The medium conveying pipe at the output end is spirally wound around the outside of the sand storage box to form a preheating section.

[0010] The present invention is further configured such that the driving structure includes a driving motor, and a synchronous belt drive structure is provided between the driving motor and the conveying shaft. The synchronous belt drive structure is a meshing transmission between a synchronous belt and a synchronous pulley, which is a known prior art. When the driving motor is started, the conveying shaft can be controlled to drive the spiral conveying blades to rotate through the cooperation between the driving motor and the synchronous belt drive structure, thereby realizing the uniform conveying of the sand core to be preheated in the combustion chamber body.

[0011] The present invention is further configured such that an air inlet box is provided on the outer side of the combustion chamber body, and an air supply pipe is provided inside the air inlet box in conjunction with the burner to provide combustible gas for the combustion of the burner.

[0012] The present invention is further configured such that an exhaust pipe is provided on the combustion chamber body, the exhaust pipe passes through the air inlet box, spirals inside the air inlet box and then exits the air inlet box to connect with external waste treatment equipment. During the combustion process of the burner, waste is generated, and this waste needs to be discharged in time. This waste carries a large amount of heat. The present invention allows the waste to pass through the air inlet box when it is discharged. In this way, the residual heat in the waste gas can be used to heat the combustion gas input into the gas supply pipe. The temperature of the preheated gas increases, which can significantly improve the combustion efficiency, make the combustion more complete, and reduce fuel waste.

[0013] The present invention is further configured such that a feeding pipe is provided at the bottom end of the sand storage box, the feeding pipe connecting the bottom end of the sand storage box to the top end of the combustion chamber body, and the sand dropping control structure includes a feeding impeller, the feeding impeller being mounted inside the feeding pipe via a bearing, and a feeding control motor being provided on the outside of the feeding pipe in conjunction with the feeding impeller. When the feeding control motor is started, the feeding impeller can be rotated, and the feeding speed in the sand storage box can be controlled, so that the sand core raw material can enter the combustion chamber body evenly, achieving uniform feeding, thereby facilitating the uniform heating of the sand core in the subsequent process.

[0014] The present invention is further configured such that a sand discharge pipe is provided at the tail end of the combustion chamber body, for discharging the preheated sand core out of the combustion chamber body for subsequent mixing with coating materials such as resin.

[0015] The present invention is further configured such that a CO / O□ detection device is provided inside the combustion chamber body, preferably a CO / O2 sensor, which can prevent the risk of incomplete combustion or explosion.

[0016] The present invention is further configured such that a temperature detection device is provided inside the combustion chamber body, and the temperature detection device preferably adopts a combination of thermocouple and infrared temperature measurement to monitor the temperature inside the combustion chamber body in real time.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides a combustion chamber for a regenerative coated sand roasting furnace, which has the following beneficial effects:

[0019] 1. This utility model achieves dynamic and uniform heating of the sand core during the conveying process by using a spiral conveying blade and conveying shaft structure set inside the combustion chamber body, in conjunction with multiple burners at the top. While the spiral conveying blades agitate the sand core, a heating medium is introduced into its internal heat exchange chamber, further heating the sand core from the inside, thus solving the problem of uneven temperature distribution caused by traditional single-point heating. Furthermore, the synergistic effect of the multi-point arrangement of the burners and the spiral conveying significantly improves the heating efficiency and uniformity of the sand core, ensuring stable quality of the coated sand.

[0020] 2. This utility model utilizes the design of the exhaust pipe spirally wound inside the air intake box to use the waste heat in the combustion exhaust gas to preheat the combustible gas in the gas supply pipe. This design not only improves the combustion efficiency of the gas but also reduces energy waste. At the same time, the waste heat of the heating medium output from the medium conveying pipe is used to preheat the sand core in the sand storage box through the preheating part, further reducing the energy consumption of the main combustion chamber and realizing multi-stage utilization of thermal energy, which is in line with the concept of green production.

[0021] 3. Through the sand drop control structure (feed impeller and feeding control motor) and the synchronous belt transmission system of the drive motor, the precise quantitative feeding and uniform conveying of sand cores are realized, avoiding the instability of manual operation. The CO / O2 detection equipment and temperature detection equipment installed inside the combustion chamber can monitor environmental parameters in real time, prevent the risk of incomplete combustion or overheating, and ensure production safety. The overall structure has a high degree of automation, is easy to operate, and is suitable for large-scale production. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the combustion chamber of a regenerable coated sand roasting furnace according to this utility model. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the overall structure of the combustion chamber of a regenerable coated sand roasting furnace according to this utility model. Figure 2 ;

[0024] Figure 3 This is a cross-sectional view of the overall internal structure of this utility model;

[0025] Figure 4 This is a cross-sectional view of the exhaust pipe inside the intake box in this utility model.

[0026] Figure 5 This is a cross-sectional view of the internal structure of the feed tube in this utility model;

[0027] Figure 6 This is a cross-sectional schematic diagram of the fit between the spiral conveying blades, the conveying shaft, and the heat exchange cavity in this utility model.

[0028] In the diagram: 1. Combustion chamber body; 2. Burner; 3. Conveying shaft; 4. Spiral conveying blades; 5. Conveying trough; 6. Medium conveying pipe; 7. Heat exchange chamber; 8. Sand storage box; 9. Preheating section; 10. Drive motor; 11. Synchronous belt drive structure; 12. Air inlet box; 13. Air supply pipe; 14. Exhaust pipe; 15. Feeding pipe; 16. Feeding impeller; 17. Feeding control motor; 18. Sand discharge pipe; 19. CO / O2 detection equipment; 20. Temperature detection equipment. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0032] Please see Figures 1-6A combustion chamber for a regenerable coated sand roasting furnace includes a combustion chamber body 1. Multiple burners 2 are installed at the top of the combustion chamber body 1. A conveying shaft 3 is installed inside the combustion chamber body 1 via bearings, and a drive structure is installed in conjunction with the conveying shaft 3. Spiral conveying blades 4 are installed on the conveying shaft 3. Both ends of the conveying shaft 3 extend outward to the outside of the combustion chamber body 1 and are provided with conveying grooves 5. A medium conveying pipe 6 is connected to the conveying groove 5 via a sealed bearing. A heat exchange chamber 7 is provided on the spiral conveying blades 4 and communicates with the conveying groove 5. A sand storage box 8 is installed at the top of the combustion chamber body 1. A sand drop control structure is provided between the bottom end of the sand storage box 8 and the combustion chamber body 1. The medium conveying pipe 6 at the output end is spirally wound around the outside of the sand storage box 8 to form a preheating section 9.

[0033] Please see Figures 1-6 As one implementation of the drive structure: the drive structure includes a drive motor 10, and a synchronous belt drive structure 11 is provided between the drive motor 10 and the conveying shaft 3. The synchronous belt drive structure 11 is a meshing transmission between a synchronous belt and a synchronous pulley, which is a known prior art. When the drive motor 10 is started, the cooperation between the drive motor 10 and the synchronous belt drive structure 11 can control the conveying shaft 3 to drive the spiral conveying blades 4 to rotate, thereby realizing the uniform conveying of the sand core to be preheated in the combustion chamber body 1.

[0034] Please see Figures 1-6 As one embodiment of the combustion chamber body 1: an air inlet box 12 is provided on the outer side of the combustion chamber body 1, and an air supply pipe 13 is provided inside the air inlet box 12 in conjunction with the burner 2 to provide combustible gas for the combustion of the burner 2.

[0035] Please see Figures 1-6 As one embodiment of the combustion chamber body 1: an exhaust pipe 14 is provided on the combustion chamber body 1. The exhaust pipe 14 passes through the air intake box 12, and spirals inside the air intake box 12 before exiting the air intake box 12 and connecting to the external waste treatment equipment. During the combustion process of the burner 2, waste is generated, which needs to be discharged in time. This waste carries a large amount of heat. This utility model makes the waste pass through the air intake box 12 when it is discharged. In this way, the residual heat in the waste gas can be used to heat the combustion gas input into the air supply pipe 13. The temperature of the preheated gas increases, which can significantly improve the combustion efficiency, make the combustion more complete, and reduce fuel waste.

[0036] Please see Figures 1-6As one implementation of the sand storage box 8: a discharge pipe 15 is provided at the bottom of the sand storage box 8, and the discharge pipe 15 connects the bottom of the sand storage box 8 to the top of the combustion chamber body 1. The sand dropping control structure includes a discharge impeller 16, which is installed inside the discharge pipe 15 through a bearing. A discharge control motor 17 is provided on the outside of the discharge pipe 15 in conjunction with the discharge impeller 16. When the discharge control motor 17 is started, the discharge impeller 16 can be rotated through the discharge control motor 17. The discharge speed in the sand storage box 8 can be controlled through the discharge impeller 16, so that the sand core raw material can enter the combustion chamber body 1 evenly, achieving uniform feeding, which is conducive to the uniform heating of the sand core in the future.

[0037] Please see Figures 1-6 As one embodiment of the combustion chamber body 1: a sand discharge pipe 18 is provided at the tail end of the combustion chamber body 1 for discharging the preheated sand core out of the combustion chamber body 1 for subsequent mixing with coating materials such as resin.

[0038] Please see Figures 1-6 As one embodiment of the combustion chamber body 1: a CO / O2 detection device 19 is provided inside the combustion chamber body 1. The CO / O2 detection device 19 is preferably a CO / O2 sensor, which can prevent the risk of incomplete combustion or explosion.

[0039] Please see Figures 1-6 As one implementation of the combustion chamber body 1: a temperature detection device 20 is installed inside the combustion chamber body 1. The temperature detection device 20 preferably adopts a combination of thermocouple and infrared temperature measurement to monitor the temperature inside the combustion chamber body 1 in real time. Multiple sets of temperature detection devices 20 can be installed inside the combustion chamber body 1 to monitor the temperature at different locations.

[0040] In summary:

[0041] This utility model, by setting up a conveying shaft 3, a spiral conveying blade 4 and a matching conveying motor, can make the sand core be evenly conveyed inside the combustion chamber body during the sand core preheating process, so that the burner 2 at the top can evenly heat the sand core being conveyed, thereby improving the heating effect.

[0042] Meanwhile, this utility model provides a medium conveying pipe 6, a conveying trough 5, and a heat exchange chamber 7 that cooperate with each other between the conveying shaft 3 and the spiral conveying blade 4. In this way, the heating medium is conveyed to the corresponding conveying trough 5 through the medium conveying pipe 6 at the tail end, and flows into the heat exchange chamber 7 inside the spiral conveying blade 4 through the conveying trough 5, thereby heating the spiral conveying blade 4. In this way, the spiral conveying blade 4 can further heat the sand core being conveyed, so that the spiral conveying blade 4 can simultaneously heat the sand core while stirring and conveying it. This can further improve the uniformity and sufficiency of heating the sand core before coating.

[0043] In this invention, a sand storage box 8 is provided at the top of the combustion chamber body, and the medium conveying pipe 6 at the first end guides the heating medium to the preheating section 9 after outputting the heating medium. In this way, the residual heat of the heating medium can be used to preheat the sand core material in the sand storage box 8. The sand storage box 8 can be provided with a stirring structure for stirring the sand core, which is prior art and will not be described in detail in this invention. The outside of the pipe structure of the preheating section 9 can be provided with a heat insulation structure, which is prior art and will not be described in detail in this invention. In this way, by preheating the sand core in advance, the heating time of the sand core in the combustion chamber can be reduced and the heating efficiency of the sand core can be improved.

[0044] When in use, start the feeding control motor 17. The feeding control motor 17 can control the rotation of the feeding impeller 16. The feeding impeller 16 can control the feeding speed in the sand storage box 8, so that the preheated sand core raw material can enter the combustion chamber body 1 evenly, achieving uniform feeding, which is conducive to the uniform heating of the sand core in the future.

[0045] Start the drive motor 10. The drive motor 10 and the synchronous belt drive structure 11 can control the conveying shaft 3 to drive the spiral conveying blades 4 to rotate, so that the sand core to be preheated can be uniformly conveyed in the combustion chamber body 1. In this way, the sand core can be stirred during the conveying process, so that the sand core can be evenly contacted with the flame sprayed from the burner 2, avoiding local overheating and improving the heating uniformity.

[0046] Simultaneously, the heating medium is transported to the corresponding conveying trough 5 through the medium conveying pipe 6 at the tail end, and flows into the heat exchange chamber 7 inside the spiral conveying blade 4 through the conveying trough 5, thereby heating the spiral conveying blade 4. In this way, the spiral conveying blade 4 can further heat the sand core being conveyed, so that the spiral conveying blade 4 can simultaneously heat the sand core while stirring and conveying it. This can further improve the uniformity and sufficiency of heating the sand core before coating.

[0047] In this utility model, an insulation structure can be installed on the outside of all pipes or structures that require heat exchange. The insulation cotton and insulation board are used together to achieve heat insulation and reduce heat loss. The setting of the insulation structure is existing known technology, and this utility model will not elaborate on it.

[0048] In all the solutions mentioned above, the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

[0049] In all the solutions mentioned above, those involving the operation of electrical components, unless otherwise specified, are controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies, and their specific circuit structures will not be described in detail here.

[0050] Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies, and this utility model will not elaborate on them.

[0051] If any of the technical solutions mentioned above involve a synchronous belt drive structure, and there is no specific structure, they are all existing technologies involving the combination of synchronous belt and synchronous pulley. The connection between the synchronous belt and the shaft structure is a known technology and will not be elaborated upon in this utility model.

[0052] Of all the solutions mentioned above, those involving the connection between solar panels and batteries can be equipped with essential accessories such as inverters, battery charging controllers, cables, fuses, and brackets. Their control principles and circuit connections are all existing, well-known, and mature technologies, and their specific circuit structures will not be elaborated here.

Claims

1. A combustion chamber of a regeneration type coated sand roaster, comprising a combustion chamber body (1), characterized in that: Multiple burners (2) are provided at the top of the combustion chamber body (1), and a conveying shaft (3) is provided inside the combustion chamber body (1) via bearings. A drive structure is provided in conjunction with the conveying shaft (3). A spiral conveying blade (4) is provided on the conveying shaft (3). Both ends of the conveying shaft (3) extend outward to the outside of the combustion chamber body (1) and are provided with conveying grooves (5). A medium conveying pipe (6) is connected to the conveying groove (5) via a sealed bearing. A heat exchange chamber (7) is provided on the spiral conveying blade (4) in communication with the conveying groove (5). A sand storage box (8) is provided at the top of the combustion chamber body (1). A sand drop control structure is provided between the bottom end of the sand storage box (8) and the combustion chamber body (1). The medium conveying pipe (6) at the output end is spirally wound around the outside of the sand storage box (8) to form a preheating part (9). The drive structure includes a drive motor (10). A synchronous belt drive structure (11) is provided between the drive motor (10) and the conveying shaft (3); an air inlet box (12) is provided on the outside of the combustion chamber body (1), and an air supply pipe (13) is provided inside the air inlet box (12) in conjunction with the burner (2); an exhaust pipe (14) is provided on the combustion chamber body (1), and the exhaust pipe (14) passes through the air inlet box (12), spirals inside the air inlet box (12), and then exits the air inlet box (12) to connect with external waste treatment equipment; a discharge pipe (15) is provided at the bottom of the sand storage box (8), and the discharge pipe (15) connects the bottom of the sand storage box (8) to the top of the combustion chamber body (1); the sand drop control structure includes a discharge impeller (16), the discharge impeller (16) is set in the discharge pipe (15) through a bearing, and a discharge control motor (17) is provided on the outside of the discharge pipe (15) in conjunction with the discharge impeller (16).

2. The combustion chamber of a regenerable coated sand roasting furnace according to claim 1, characterized in that: The combustion chamber body (1) is provided with a sand discharge pipe (18) at its tail end; a CO / O2 detection device (19) is provided inside the combustion chamber body (1); and a temperature detection device (20) is provided inside the combustion chamber body (1).

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