A casting launder downspout heater apparatus

Abstract

The utility model discloses a kind of casting runner lower injection pipe heater devices, it is related to foundry technical field, including support and preheating device;Preheating device includes gas nozzle, jet pipe and fire collecting hood respectively fixed on support;Gas nozzle is fixed on support, and is connected with gas supply device, its gas outlet direction is vertically upwards;Jet pipe cover is located outside gas nozzle and vertically extends upwards, its bottom is provided with the air inlet of intercommunication outside, its top is provided with jet port;Fire collecting hood cover is located outside jet pipe and vertically extends upwards, its height is higher than the height of jet pipe, and its top heat port is located at the bottom of injection pipe.By support preheating device, the gas nozzle of preheating device, jet pipe and fire collecting hood cooperate, can effectively preheat casting runner lower injection pipe, avoid cold-state injection pipe to directly contact high-temperature molten metal to produce crack, spalling and other problems, prevent local cooling of molten metal to form cold separation or blockage, improve metal casting quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of metal casting technology, and in particular to a casting trough pouring pipe heater device. Background Technology

[0002] In metal casting, especially in ingot casting, the casting chute pouring pipe is a crucial component. Its main function is to guide molten metal from the ladle or tundish into the mold, such as an ingot mold, in a smooth and controllable manner, effectively preventing thermal shock from adversely affecting the casting process.

[0003] However, in actual production, a series of serious problems arise when the cold casting tube comes into direct contact with the high-temperature molten metal. Firstly, due to the significant temperature difference between the refractory material of the casting tube and the high-temperature molten metal, sudden heating can cause cracks or spalling in the tube. This not only shortens the tube's service life and increases production costs but also affects the continuity and stability of the casting process. Secondly, as the molten metal flows through the cold casting tube, localized cooling occurs, easily leading to cold shuts or blockages. Cold shuts can cause internal defects in the casting, reducing its mechanical properties and quality; blockages can disrupt the casting process and, in severe cases, even cause production accidents, resulting in significant economic losses for the company. Utility Model Content

[0004] The purpose of this invention is to provide a casting trough pouring pipe heater device. This device can effectively preheat the casting trough pouring pipe, avoiding problems such as cracks and peeling caused when the cold pouring pipe directly contacts the high-temperature molten metal. At the same time, it prevents the molten metal from cooling locally and forming cold shuts or blockages when flowing through the pouring pipe, thereby improving the quality and production efficiency of metal casting.

[0005] To achieve the above objectives, this utility model provides a casting trough inlet heating device, including a support and a preheating device; the preheating device includes a gas nozzle, a jet pipe, and a flame shroud, all fixed to the support; the gas nozzle is fixed to the support and connected to a gas supply device, with its outlet direction vertically upward; the jet pipe is shrouded outside the gas nozzle and extends vertically upward, with an air inlet at its bottom connecting to the outside and a jet outlet at its top; the flame shroud is shrouded outside the jet pipe and extends vertically upward, its height being higher than the height of the jet pipe, and its top heat outlet is located at the bottom of the inlet pipe.

[0006] With the above structure, the preheating device is supported by a bracket. The gas nozzle, jet pipe and fire hood of the preheating device work together to effectively preheat the casting trough pouring pipe, avoiding the problem of cracks and peeling caused by the cold pouring pipe directly contacting the high temperature molten metal. It also prevents the molten metal from cooling locally and forming cold shuts or blockages, thereby improving the quality of metal casting and production efficiency.

[0007] Preferably, the jet tube is a Venturi tube, which, from bottom to top, includes an inlet cylindrical section, a conical contraction section, a cylindrical throat, and a conical diffuser section; the gas nozzle jets directly onto the cylindrical throat. This structure utilizes the Venturi effect to draw in more air, ensuring thorough mixing of the gas and air, improving combustion efficiency, and generating more intense heat to preheat the injection pipe.

[0008] Preferably, the heat-concentrating shroud includes an outer wall and an annular inner inclined surface disposed inside the outer wall, the upper edges of which are connected to form a heat-insulating cavity at their bottom; the annular inner inclined surface forms a conical structure that extends downwards from the top of the outer wall toward the jet pipe. This structure helps to concentrate heat, reduce heat loss, guide the hot airflow to focus on the bottom of the injection pipe, and enhance the heat insulation effect of the heat-insulating cavity, thereby improving preheating efficiency.

[0009] Preferably, the upper surface of the annular inner inclined surface is provided with stripes distributed in an annular array. This structure can prevent the flame from spreading outward, prolong the outward spread time, and enhance the heat storage performance.

[0010] Preferably, the bottom of the outer wall is provided with a ventilation opening connecting to the outside. This structure enables secondary combustion, regulates airflow inside the flame hood, ensures stable combustion, discharges some exhaust gases, and maintains a good working environment.

[0011] Preferably, the heat-concentrating cover is integrally molded from ceramic material. This structural design allows it to withstand high-temperature environments, reduces heat loss, ensures structural stability, and enables long-term stable operation.

[0012] Preferably, the support includes a base plate and legs disposed at the bottom of the base plate; the gas nozzle, jet pipe, and flame shroud are all fixedly mounted on the base plate, and the air inlet is located on the base plate within the coverage area of ​​the jet pipe. This structural arrangement provides stable support for the entire device, ensuring that air can smoothly enter the jet pipe and participate in combustion, as the gas nozzle, jet pipe, and flame shroud are fixed to the base plate and the air inlet is located within the coverage area of ​​the jet pipe on the base plate.

[0013] Preferably, the jet pipe has a flange at its bottom, which is fixed to the base plate by welding or screwing. Fixing it to the base plate by welding or screwing ensures convenient and secure installation.

[0014] Preferably, the bottom of the fire-concentrating cover is provided with mounting holes, and nuts are embedded in the mounting holes; the base plate is provided with through holes corresponding to the mounting holes, and bolts are installed in the through holes and mounting holes to achieve fixed installation. Installation is convenient and secure using bolts.

[0015] Preferably, the device has three outriggers. This configuration provides more stable support for the device.

[0016] After adopting the above technical solution, the beneficial effects of this utility model are: This invention, a casting trough pouring pipe heater, solves a series of problems caused by the direct contact of a cold pouring pipe with high-temperature molten metal in existing technologies. The invention utilizes a support frame to support the preheating device, which, in conjunction with its gas nozzle, jet pipe, and flame-collecting hood, effectively preheats the casting trough pouring pipe. This prevents cracking and peeling caused by direct contact between the cold pouring pipe and the high-temperature molten metal, and also prevents localized cooling of the molten metal, leading to cold shuts or blockages, thereby improving the quality and efficiency of metal casting. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation structure of a casting trough pouring pipe heater device according to the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of a casting trough pouring pipe heater device of the present invention. Figure 3 yes Figure 2 Side sectional view; Figure 4 yes Figure 2 A schematic diagram of the structure of the central support.

[0018] In the diagram, 1 is the support, 11 is the base plate, 110 is the air inlet, 12 is the support leg, 2 is the preheating device, 21 is the gas nozzle, 22 is the jet pipe, 221 is the inlet cylindrical section, 222 is the conical contraction section, 223 is the cylindrical throat, 224 is the conical diffuser section, 23 is the flame hood, 231 is the outer wall, 232 is the annular inner slope, 233 is the stripe, 234 is the vent, 3 is the gas supply device, and I is the injection pipe. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] The orientations mentioned in this specification are based on the orientation of the casting trough lower pipe heater device of this utility model during normal operation, and do not limit its orientation during storage and transportation. They only represent relative positional relationships and do not represent absolute positional relationships.

[0021] like Figure 1 and Figure 2 As shown, a casting runner pouring pipe heater device includes a support 1 and a preheating device 2 mounted on the support 1. The pouring pipe 1 is heated by the preheating device 2 before entering the mold.

[0022] like Figures 1-4As shown, the support 1 includes a base plate 11 and support legs 12 disposed at the bottom of the base plate 11. In this embodiment, three support legs 12 are provided. The support 1 provides stable support for the entire device.

[0023] The preheating device 2 includes a gas nozzle 21, a jet pipe 22, and a flame-gathering shroud 23. The gas nozzle 21 is fixed on the base plate 11 and located at the center of the jet pipe 22. The gas nozzle 21 is connected to a gas supply device 3, and its gas outlet direction is vertically upward, which can stably spray the gas upward.

[0024] The jet pipe 22 is installed outside the gas nozzle 21 and extends vertically upwards, with its bottom fixed to the base plate 11. Specifically, the jet pipe 22 is fixed to the base plate 11 by welding or screw tightening, provided by a flange at its bottom. For long-term use in high-temperature environments, welding is preferred; for frequent disassembly and maintenance, screw tightening is acceptable. The jet pipe 22 has an air inlet 110 at its bottom and a jet nozzle at its top. In this embodiment, the air inlet 110 is located on the base plate 11, within the coverage area of ​​the jet pipe 22, ensuring that air can smoothly enter the jet pipe 22 to participate in combustion. The air inlet 110 connects to the outside environment to introduce air to support gas combustion. After the gas is fully mixed with the air entering from the air inlet 110 inside the jet pipe 22, it is ejected from the jet nozzle for combustion, and the generated heat preheats the injection pipe I.

[0025] The air inlet 110 can be circular or arc-shaped, and its number can be reasonably set. In this embodiment, the air inlet 110 is an arc-shaped opening that is evenly arranged upward around the gas nozzle 21, and there are three of them. This is a reasonable arrangement in actual applications.

[0026] A fire-concentrating shroud 23 is installed outside the jet pipe 22 and extends vertically upwards, with its bottom fixed to the base plate 11. Specifically, the shroud 23 has mounting holes at its bottom, with nuts embedded within these holes; the base plate 11 has through holes corresponding to the mounting holes, and bolts are installed in the through holes and mounting holes to secure the fire-concentrating shroud 23 to the base plate 11. The height of the fire-concentrating shroud 23 is greater than the height of the jet pipe 22, and its top heat outlet is located at the bottom of the injection pipe I. The fire-concentrating shroud 23 provides excellent fire-concentrating and windproofing effects; it also concentrates and transfers the heat generated by combustion to the bottom of the injection pipe I, effectively preheating the injection pipe I.

[0027] Further improvements include a Venturi tube 22, which, from bottom to top, comprises an inlet cylindrical section 221, a conical contraction section 222, a cylindrical throat 223, and a conical diffuser section 224; the gas nozzle 21 jets directly into the cylindrical throat 223. When the gas is ejected from the gas nozzle 21 and jets directly into the cylindrical throat 223, a high-speed airflow is formed at the throat 223. According to the Venturi effect, this high-speed airflow reduces the pressure in this area, thereby drawing in more air from the inlet 110, ensuring thorough mixing of the gas and air, improving combustion efficiency, and generating more intense heat for preheating the injection pipe.

[0028] Further improvements include an outer wall 231 and an annular inner inclined surface 232 disposed inside the outer wall 231, with their upper edges connected to form a heat insulation cavity at their bottom. The annular inner inclined surface 232 forms a conical structure that extends downwards from the top of the outer wall 231 toward the jet pipe 22. This structural design not only effectively concentrates heat and reduces heat loss, but also guides the hot airflow upwards and concentrates it on the bottom of the injection pipe. Simultaneously, the heat insulation cavity further enhances the heat insulation effect, preventing excessive heat loss to the surrounding environment, improving preheating efficiency, and preventing burns.

[0029] In a further improvement, the upper surface of the annular inner inclined surface 232 is provided with stripes 233 arranged in annular array. The cross-sectional shape of the stripes 233 can be triangular or rectangular, and in this embodiment, it is an equilateral triangular structure; its height is 2-5mm and its width is 1-3mm; its distribution density can be reasonably set according to the size of the annular inner inclined surface 232, preferably 3-5 stripes per centimeter.

[0030] To further optimize the performance of the flame-concentrating shield 23, the upper surface of the annular inner inclined surface 232 is provided with annularly distributed stripes 233. These stripes 233 serve to block the flame from spreading outward, prolong the outward spread time, and improve the heat storage performance.

[0031] The bottom of the outer wall 231 is provided with a ventilation port 234 that connects to the outside. This ventilation port 234 can realize secondary combustion. By the natural convection of air around the flame, the air circulation inside the flame shroud 23 is regulated to ensure the stable progress of the combustion process. At the same time, it also helps to exhaust some of the exhaust gas produced by combustion and maintain a good working environment inside the device.

[0032] The fire-concentrating cover 23 is integrally molded from ceramic material. Ceramic material has advantages such as high temperature resistance and good heat insulation performance. The fire-concentrating cover 23, which is integrally molded from ceramic material, can better withstand high temperature environments, reduce heat loss, and has good structural stability, enabling it to work stably for a long time.

[0033] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A casting trough pouring pipe heater device, characterized in that: Includes support frame and preheating device; The preheating device includes a gas nozzle, a jet pipe, and a flame-concentrating hood, which are respectively fixed on the bracket. The gas nozzle is fixed on the bracket and connected to a gas supply device, with its gas outlet direction vertically upward. The jet tube cover is located outside the gas nozzle and extends vertically upward. It has an air inlet at the bottom that connects to the outside and an air jet outlet at the top. The heat-gathering hood is installed outside the jet tube and extends vertically upward, with its height exceeding that of the jet tube, and its top heat port is located at the bottom of the injection tube.

2. The casting runner bottom pipe heater device according to claim 1, characterized in that: The jet tube is a venturi tube, which includes, from bottom to top, an inlet cylindrical section, a conical contraction section, a cylindrical throat, and a conical diffusion section; the gas nozzle jet is directed towards the cylindrical throat.

3. The casting runner bottom pipe heater device according to claim 1, characterized in that: The fire-gathering shroud includes an outer wall and an annular inner inclined surface disposed inside the outer wall, the upper edges of which are connected to each other to form a heat-insulating cavity at its bottom; the annular inner inclined surface forms a conical structure that extends obliquely downward from the top of the outer wall toward the jet pipe.

4. The casting runner bottom pipe heater device according to claim 3, characterized in that: The upper surface of the inner inclined surface of the ring is provided with stripes distributed in a ring array.

5. The casting runner bottom pipe heater device according to claim 3, characterized in that: The bottom of the outer wall is provided with a ventilation opening that connects to the outside.

6. The casting runner bottom pipe heater device according to claim 3, characterized in that: The fire-gathering cover is integrally molded from ceramic material.

7. The casting runner bottom pipe heater device according to claim 1, characterized in that: The support includes a base plate and support legs disposed at the bottom of the base plate; The gas nozzle, jet pipe, and flame-gathering shroud are all fixedly installed on the base plate, and the air inlet is located on the base plate within the coverage area of ​​the jet pipe.

8. The casting runner bottom pipe heater device according to claim 7, characterized in that: The bottom of the jet tube is equipped with a flange, which is fixedly installed on the base plate by welding or screwing.

9. A casting trough pouring pipe heater device according to claim 7, characterized in that: The bottom of the fire-gathering cover is provided with mounting holes, and nuts are embedded in the mounting holes; the base plate is provided with through holes corresponding to the mounting holes, and bolts are installed in the through holes and mounting holes to achieve fixed installation.

10. A casting trough pouring pipe heater device according to claim 7, characterized in that: The outriggers are provided in three parts.

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