Rapid cooling ladle

Abstract

This utility model discloses a rapidly cooling ladle, comprising a ladle body, with cooling pipes arranged spirally around the ladle body on its outer periphery or inner wall, and containing a cooling medium. This rapidly cooling ladle, by incorporating cooling pipes and a cooling medium into the ladle body, avoids solely pursuing rapid cooling. Instead, it accelerates heat dissipation at specific temperatures and within designated cooling times. Through this rapid cooling ladle's temperature control, the temperature of the molten iron can be maintained within a reasonable range, preventing slow cooling that could lead to problems such as melting, collision, and floating of crystal nuclei, severely reducing nucleation capacity. Simultaneously, it can refine graphite and create more nuclei, achieving the effects of graphite refinement and grain refinement, thus ensuring casting performance and improving metallurgical quality.

Description

Technical Field

[0001] This utility model relates to the field of casting production technology, specifically to a ladle for rapid cooling of molten iron. Background Technology

[0002] The molten iron ladle is an important tool for holding molten iron in the casting production process. It is needed to store molten iron, as well as to transfer and pour molten iron.

[0003] During the cast iron smelting process, after the molten iron melts into a liquid state, a higher superheating temperature is often required. This dissolves the primary graphite below the critical radius for crystallization, enhancing the nucleation ability and refining the graphite. Simultaneously, it removes harmful substances such as gases, oxides, and inclusions from the molten iron. High-temperature superheating temperatures can reach 1500℃ or even 1540℃ and above. However, for large castings (tens of tons, hundreds of tons, etc.), a lower pouring temperature (1320-1360℃) is often required. Excessively high temperatures can lead to defects such as shrinkage porosity, while excessively low temperatures can cause defects such as cold shuts, affecting the overall performance of the casting. In actual production, the molten iron is usually superheated to... After reaching 1500℃, the molten iron is poured into a ladle. Slag removal and other slag removal operations are then performed inside the ladle, followed by a long cooling period (30 minutes or more). The molten iron is poured only after the temperature in the ladle drops to the acceptable range of 1320-1360℃. Although the molten iron cools down during this process, the heat dissipation inside the ladle is very slow. This causes serious problems such as melting, collision, and floating of crystal nuclei within the molten iron, which severely reduce the nucleation ability. As a result, the graphite and grains in the molten iron become coarse, reducing the metallurgical properties of the molten iron and ultimately leading to poor metallurgical quality. This is not conducive to the production of high-end castings and the long waiting time delays production time and efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a ladle for rapid cooling of molten iron.

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

[0006] A rapidly cooling ladle includes a ladle body, with cooling pipes arranged around the outer periphery or inner wall of the ladle body. The cooling pipes are spirally arranged around the ladle body, and each end of the cooling pipe has a pipe joint. One pipe joint is detachably connected to an external inlet pipe for inputting cooling medium, and the other pipe joint is detachably connected to an external outlet pipe for discharging cooling medium.

[0007] This rapid cooling ladle, by incorporating cooling pipes on its body and introducing a cooling medium, accelerates the heat dissipation of the ladle, thereby speeding up the cooling of the molten iron inside and allowing it to cool rapidly to the required pouring temperature. This avoids prolonged cooling and delays that could extend production time or negatively impact the properties of the molten iron.

[0008] Furthermore, the cooling medium is a coolant or cooling air, and the external access pipe is connected to an external cold source, which provides the cooling medium.

[0009] Furthermore, the cooling pipe is equipped with one or more of a pressure sensor, a flow meter, and a temperature sensor near the pipe joint.

[0010] In some embodiments, the cooling pipe is a metal pipe, and the cross-section of the cooling pipe is circular, square, or triangular.

[0011] In some embodiments, the cooling pipe has a heat exchange surface on the side facing the inner cavity of the molten iron ladle, and an inner cavity is provided on the inner side of the heat exchange surface. The inner cavity is connected to the inner cavity of the cooling pipe, and the heat exchange surface is an arc-shaped surface that fits the outer periphery of the molten iron ladle.

[0012] Furthermore, the outer periphery of the cooling pipe is provided with a number of heat dissipation fins and / or heat dissipation rings. The heat dissipation fins are arranged along the length direction of the cooling pipe, and the heat dissipation rings are arranged at intervals along the length direction of the cooling pipe to further enhance its heat dissipation and heat exchange capabilities.

[0013] In some embodiments, the outer periphery of the molten iron ladle body is also provided with a detachable binding strap. The binding strap is used to fix the cooling pipes arranged on the outer periphery. The binding strap is provided with several arc-shaped ridges at intervals. The arc-shaped ridges bind the cooling pipes. The two ends of the binding strap are respectively connected to the molten iron ladle body by screws. This connection and installation method is relatively simple and convenient.

[0014] Furthermore, the restraint strap has magnetic blocks embedded between adjacent arc-shaped bulges.

[0015] In some embodiments, the ladle body comprises, from the inside out, a refractory brick layer, a refractory interlayer, and a metal outer layer. The cooling pipe is arranged in the refractory interlayer, and both ends of the cooling pipe extend through the metal outer layer and are connected to the pipe joint. The cooling pipe is installed by pre-embedding, which has good stability and safety.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. This rapid cooling ladle, by setting the cooling pipes on the ladle body and introducing the cooling medium, can accelerate the heat dissipation capacity of the ladle body, thereby facilitating the rapid cooling of the molten iron inside the ladle and allowing the molten iron to cool down quickly to the required pouring temperature. This avoids prolonged cooling waiting time that would extend production time and also prevents prolonged cooling waiting time from affecting the performance of the molten iron; 2. The cooling pipes are arranged in a spiral around the ladle, which can increase the heat dissipation area and range, enabling all-round heat dissipation of the ladle body; the pipe joints are set to connect to external pipelines, utilizing the heat exchange of the cooling medium to quickly remove heat. 3. Through the cooling control of this rapid cooling ladle, the cooling of molten iron can be maintained within a reasonable range, avoiding serious problems such as melting, collision, and floating of crystal nuclei in the molten iron due to slow cooling, which seriously reduces the nucleation ability. At the same time, it can refine graphite and create more nuclei to achieve the effect of refining graphite and refining grains, ensuring casting performance and improving metallurgical quality; 4. The setting of the heat exchange surface can increase the contact area and heat exchange area, which is beneficial to the installation and fixation of the cooling pipe and also to heat exchange; 5. The setting of the heat dissipation fins and the heat dissipation rings can further increase the heat dissipation and heat exchange area of ​​the cooling pipe; 6. It can quickly shorten the cooling waiting time of large iron casting molten iron ladles to within 30 minutes or even less. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a molten iron ladle for rapid cooling according to this utility model;

[0018] Figure 2 This is a schematic diagram of the cooling pipe of this utility model installed on the outer periphery of the molten iron ladle;

[0019] Figure 3 This is a schematic diagram of the cooling pipe of this utility model installed inside the perimeter wall of the molten iron ladle;

[0020] Figure 4 A schematic diagram showing the cooling pipe of this utility model with heat dissipation fins;

[0021] Figure 5 A schematic diagram showing a cooling pipe with heat dissipation fins in another structure according to this utility model;

[0022] Figure 6 A schematic diagram showing the heat dissipation ring fins installed on the cooling pipe of this utility model;

[0023] Figure 7 This is a schematic diagram of the present invention, which uses a restraining strap to fix the cooling pipe outside the molten iron ladle;

[0024] Figure 8This is a partial cross-sectional structural diagram of the present invention, which uses a binding strap to fix the cooling pipe outside the molten iron ladle.

[0025] Figure 9 A partial cross-sectional schematic diagram of the cooling pipes installed inside the periphery of the molten iron ladle according to this utility model;

[0026] Figure 10 A partial cross-sectional schematic diagram of another cooling pipe installed inside the circumferential wall of the molten iron ladle according to this utility model;

[0027] In the diagram: 1. Ladle body; 101. Metal outer layer; 102. Refractory interlayer; 103. Refractory brick layer; 2. Cooling pipe; 3. Pipe joint; 4. Heat exchange surface; 5. Heat dissipation fins; 6. Heat dissipation ring; 7. Binding band; 8. Arc-shaped bulge; 9. Magnetic block. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Combination Figures 1-10 As shown, a rapidly cooling ladle includes a ladle body 1. A cooling pipe 2 is provided on the outer periphery or inside the periphery of the ladle body 1. The cooling pipe 2 is arranged spirally around the ladle body 1. Each end of the cooling pipe 2 is provided with a pipe joint 3. One pipe joint 3 is detachably connected to an external inlet pipe for inputting cooling medium, and the other pipe joint 3 is detachably connected to an external outlet pipe for discharging cooling medium.

[0031] This rapid cooling ladle, by setting the cooling pipe 2 on the ladle body 1 and introducing the cooling medium, can accelerate the heat dissipation capacity of the ladle body, thereby helping to speed up the cooling rate of the molten iron inside the ladle, allowing the molten iron to cool down quickly to the required pouring temperature, avoiding prolonged cooling waiting time that would extend production time, and also avoiding the impact of prolonged cooling waiting time on the performance of the molten iron.

[0032] The cooling pipe 2 is arranged in a spiral around the molten iron ladle, which can increase the heat dissipation area and range, and can dissipate heat from all directions on the molten iron ladle body; the pipe joint is set to connect to external pipelines, such as connecting the external inlet pipe to introduce cooling medium, which can quickly remove heat by heat exchange of the cooling medium, and connecting the external outlet pipe to discharge the cooling medium after heat exchange introduced into the cooling pipe.

[0033] The rapid cooling described in this invention is relative to the natural cooling rate of existing molten iron ladles. For example, the temperature of molten iron poured into a ladle is around 1500℃. After slag removal and transfer, the temperature will drop to around 1400℃, while the optimal pouring temperature is around 1320℃, meaning a temperature drop of about 80℃ is required. Since molten iron ladles are high-temperature resistant containers, holding tens of tons of molten iron, the cooling rate of such a volume of molten iron in a ladle is usually around 1℃ / min. A total temperature reduction of 80℃ would take more than an hour. This rapid cooling ladle design increases the overall cooling rate of the molten iron in the ladle to 2-5℃ / min. This significantly increased cooling rate results in a substantial reduction in waiting time, which can be controlled to within 30 minutes. It should be noted that excessively rapid cooling can also have adverse effects; therefore, the design does not solely pursue rapid cooling but allows for specific cooling times at specific temperatures.

[0034] By controlling the cooling of the molten iron in this rapid cooling ladle, the temperature of the molten iron can be maintained within a reasonable range, avoiding serious problems such as melting, collision, and floating of crystal nuclei in the molten iron caused by slow cooling, which seriously reduces the nucleation ability. At the same time, it can refine graphite and create more nuclei to achieve the effect of refining graphite and refining grains, ensuring the performance of castings and improving metallurgical quality.

[0035] Furthermore, the cooling medium is a coolant or cooling air, and the external access pipe is connected to an external cold source, which provides the cooling medium.

[0036] Depending on the actual conditions of the workshop, liquid cooling or air cooling can be selected. For example, when air cooling is used, the external access pipe is the air duct, and cooling air can be introduced by connecting the air duct to the pipe joint.

[0037] Furthermore, the cooling pipe 2 is equipped with one or more of a pressure sensor, a flow meter, and a temperature sensor near the pipe joint. These sensors can be used individually or in combination.

[0038] The pressure sensor can acquire the pressure flowing into the cooling pipe, the flow meter can acquire the flow rate, and the temperature sensor can acquire the temperature change of the cooling medium at the inlet and outlet in real time. Based on these temperature change data, the cooling effect can be judged, and the cooling medium flowing into the cooling pipe can be more purposefully controlled based on the pressure and flow rate.

[0039] In some embodiments, the cooling pipe 2 is a metal pipe with a circular cross-section, meaning that a circular metal pipe can be used for heat dissipation.

[0040] In some implementations, combined Figure 5 As shown, the cooling pipe 2 has a heat exchange surface 4 on the side facing the inner cavity of the molten iron ladle, and an inner cavity is provided on the inner side of the heat exchange surface 4, which communicates with the inner cavity of the cooling pipe 2. In this case, the heat exchange surface 4 increases the contact area and heat exchange area, which is beneficial for both the installation and fixation of the cooling pipe and heat exchange.

[0041] Furthermore, the outer periphery of the cooling pipe 2 is provided with a plurality of heat dissipation fins 5 and / or heat dissipation rings 6. The heat dissipation fins 5 are arranged along the length direction of the cooling pipe 2, and the heat dissipation rings 6 are arranged at intervals along the length direction of the cooling pipe 2.

[0042] For circular cooling pipes, the heat dissipation fins 5 can be installed on their outer periphery (e.g., Figure 4 As shown), the heat dissipation ring 6 can also be set (e.g. Figure 6 As shown), this further increases the heat dissipation area of ​​the cooling pipes; for cooling pipes 2 arranged on the outer periphery, the heat dissipation fins 5 or heat dissipation rings 6 (which can be semi-rings) can directly dissipate heat into the air; for cooling pipes 2 arranged within the peripheral wall, the heat dissipation fins 5 or heat dissipation rings 6, in addition to increasing the heat exchange area, can also increase the contact area with the refractory material in the refractory interlayer, improving the overall connection strength and stability. For cooling pipes with heat exchange surfaces 4, multiple heat dissipation fins 5 (such as...) can be arranged on the outer peripheral surface outside the heat exchange surface. Figure 5 (As shown). Example 1

[0043] In this embodiment, the cooling pipe 2 is disposed on the outer periphery of the molten iron ladle body 1.

[0044] Furthermore, in combination Figure 7 and Figure 8As shown, the outer periphery of the molten iron ladle body 1 is also provided with a detachable binding strap 7. The binding strap 7 is used to fix the cooling pipe 2 arranged on the outer periphery. The binding strap 7 is provided with several arc-shaped ridges 8 at intervals. The arc-shaped ridges 8 bind the cooling pipe 2. The two ends of the binding strap 7 are respectively connected to the molten iron ladle body 1 by screws.

[0045] The binding straps 7 are multiple vertically arranged metal strips that can fix the cooling pipes to the outer periphery of the molten iron ladle. The arc-shaped protrusions 8 on the binding straps 7 can press down on the cooling pipes. Multiple arc-shaped protrusions 8 can simultaneously bind each vertical ring of cooling pipes. The connecting parts at both ends are connected and fixed to the molten iron ladle body 1 by screws. This connection and installation method is relatively simple and easy to disassemble. When the cooling pipes are not needed, they can be removed, and the cooling pipes can be easily replaced.

[0046] Since the ladle is also equipped with a handle, and the connecting arm of the handle has a connection area with the body of the ladle, this connection area can be avoided when winding the cooling pipe to avoid affecting the normal use of the handle.

[0047] Furthermore, the binding strap 7 has a magnetic block 9 embedded between adjacent arc-shaped protrusions 8. The magnetic block 9 allows the binding strap to be connected to the outer metal layer of the molten iron ladle body by magnetic attraction, further improving the connection stability of the binding strap 7. It also has a good pre-connection effect, making it convenient to adjust the position of the binding strap and to connect the screws. Example 2

[0048] In this embodiment, the cooling pipe 2 is disposed within the peripheral wall of the molten iron ladle body 1.

[0049] Specifically, such as Figure 9 and Figure 10 As shown, the ladle body 1 comprises, from the inside out, a refractory brick layer 103, a refractory interlayer 102, and a metal outer layer 101. The cooling pipe 2 is arranged in the refractory interlayer 102, and both ends of the cooling pipe 2 extend out of the metal outer layer 101 and are connected to the pipe joint 3. The refractory interlayer 102 is an inner lining cast from refractory material.

[0050] This method requires pre-embedding the cooling pipes 2 during the fabrication of the ladle lining. This arrangement allows for a more direct and significant heat exchange effect, and since the cooling pipes 2 are not exposed, their stability and safety are also enhanced. The ends of the cooling pipes can be led out through vent holes on the outer metal layer, or additional holes can be drilled in the outer metal layer to lead out the ends of the cooling pipes.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rapid cooling ladle comprising a ladle body, characterized by, Cooling pipes are provided on the outer periphery or inside the periphery of the ladle body. The cooling pipes are arranged spirally around the ladle body. Each end of the cooling pipe is provided with a pipe joint. One pipe joint is detachably connected to an external inlet pipe for inputting cooling medium, and the other pipe joint is detachably connected to an external outlet pipe for discharging cooling medium.

2. The rapid cooling ladle according to claim 1, wherein The cooling medium is either coolant or cooling air, and the external inlet pipe is connected to an external cold source, which provides the cooling medium.

3. The rapid cooling ladle of claim 1, wherein The cooling pipe is equipped with one or more of the following: a pressure sensor, a flow meter, and a temperature sensor, near the pipe joint.

4. The rapidly cooling ladle of molten iron according to claim 1, characterized in that, The cooling pipe is a metal pipe, and the cross-section of the cooling pipe is circular, square, or triangular.

5. The rapidly cooling ladle of molten iron according to claim 1, characterized in that, The cooling pipe has a heat exchange surface on the side facing the inner cavity of the molten iron ladle, and an inner cavity is provided on the inner side of the heat exchange surface, which is connected to the inner cavity of the cooling pipe.

6. The rapidly cooling ladle of molten iron according to claim 1, characterized in that, The outer periphery of the cooling pipe is also provided with a number of heat dissipation fins and / or heat dissipation rings. The heat dissipation fins are arranged along the length direction of the cooling pipe, and the heat dissipation rings are arranged at intervals along the length direction of the cooling pipe.

7. The rapidly cooling ladle of molten iron according to claim 1, characterized in that, The outer periphery of the molten iron ladle body is also provided with a detachable binding strap. The binding strap is used to fix the cooling pipes arranged on the outer periphery. The binding strap is provided with several arc-shaped ridges at intervals. The arc-shaped ridges bind the cooling pipes. The two ends of the binding strap are respectively connected to the molten iron ladle body by screws.

8. The rapidly cooling ladle of molten iron according to claim 7, characterized in that, The restraint strap has magnetic blocks embedded between adjacent arc-shaped bulges.

9. The rapidly cooling ladle of molten iron according to claim 1, characterized in that, The ladle body comprises, from the inside out, a refractory brick layer, a refractory interlayer, and a metal outer layer. The cooling pipe is arranged in the refractory interlayer, and both ends of the cooling pipe extend out of the metal outer layer and are connected to the pipe joint.

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