Cast iron flow nozzle structure and molten iron flow groove

Abstract

The utility model discloses a cast iron flow nozzle structure and a molten iron flow groove, which belong to the technical field of metallurgical cast iron, and comprise a flow nozzle groove body, a cooling water groove is arranged on the lower end face of a groove body bottom plate on the outlet side of the flow nozzle groove body, and the cooling water groove and the groove body bottom plate are enclosed to form a closed cooling cavity. A water inlet is formed in the side wall of the cooling water tank close to the outlet side of the flow nozzle tank body, the water inlet is communicated with an external cooling water source through a water inlet pipe, and a water outlet is formed in the bottom plate of the cooling water tank far away from the outlet side of the flow nozzle tank body. According to the utility model, a slag-iron mixture at the outlet of the flow nozzle can automatically fall off or fall off when being slightly touched during the operation of a mold, so that the smooth flowing of molten iron and the uniform pouring of a casting are ensured; meanwhile, the temperature of the outlet side of the flow nozzle groove body is effectively controlled, thermal stress concentration caused by high temperature is reduced, and therefore the risk that the flow nozzle is deformed and damaged due to thermal stress is reduced, and the service life of the flow nozzle is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical cast iron, and particularly relates to a cast iron nozzle structure and an iron water chute. Background Art

[0002] Most of the molten iron produced by blast furnaces is transported to steel mills for steelmaking. However, due to reasons such as unqualified molten iron in blast furnaces or steelmaking maintenance, some molten iron is sent to the cast iron workshop for casting. During the casting process, the poured molten iron is poured into the iron water chute and flows into the molds of the running casting machine through the nozzles of the iron water chute.

[0003] During the process of the molten iron flowing from the nozzle to the mold, due to the combined action of the fluidity and gravity of the molten iron at high temperature, molten metal residues and incompletely discharged iron slag continuously accumulate and adhere to the inclined outlet edge of the nozzle, forming layers of slag-iron mixtures. This not only affects the smoothness of the nozzle, hinders the smooth flow of molten iron, leads to uneven pouring, and affects the quality of castings; secondly, it may also increase the resistance of the nozzle, and even cause the nozzle to be blocked or damaged, thus affecting production efficiency and equipment life. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the utility model provides a cast iron nozzle structure and an iron water chute, so that the slag-iron mixture at the nozzle outlet can fall off automatically or be slightly touched during the operation of the mold to fall off, thereby ensuring the smooth flow of molten iron and the uniform pouring of castings; at the same time, the temperature on the outlet side of the nozzle trough body is effectively controlled, reducing the thermal stress concentration caused by high temperature, thereby reducing the risk of deformation and damage of the nozzle due to thermal stress and extending its service life.

[0005] The utility model is realized as follows. On the one hand, the present application provides a cast iron nozzle structure, including a nozzle trough body. A cooling water groove is provided on the lower end surface of the trough bottom plate on the outlet side of the nozzle trough body. The cooling water groove and the trough bottom plate enclose a sealed cooling chamber. A water inlet is provided on the side wall of the cooling water groove close to the outlet side of the nozzle trough body. The water inlet is connected to an external cooling water source through a water inlet pipe. A water outlet is provided on the bottom plate of the cooling water groove far from the outlet side of the nozzle trough body. The water inlet is arranged close to the outlet side of the nozzle trough body, which means that the cooling water can first contact the part that most needs to be cooled, that is, the area where the slag-iron mixture is most likely to accumulate and adhere. This design enables the cooling water to more effectively reduce the temperature of this area, reduce thermal stress, prevent the formation of slag-iron mixtures and damage to the nozzle.

[0006] Furthermore, at least two partitions are arranged in the cooling chamber between the water inlet and the water outlet, and the adjacent partitions are staggered to form an S-shaped flow channel. Prolonging the residence time of cooling water in the cooling chamber helps to make fuller use of the heat exchange capacity of cooling water and improve the cooling effect of the convection nozzle slot and its surrounding components; it can be more evenly distributed in various areas of the cooling chamber, avoiding local overheating or insufficient cooling, and further improving the uniformity and efficiency of cooling.

[0007] Furthermore, a refractory layer is cast in the nozzle slot body.

[0008] On the other hand, the present application provides a molten iron flow trough, comprising an iron receiving trough body and an iron chute body, wherein the outlet side of the iron chute body is connected to and provided with the above-mentioned cast iron nozzle structure.

[0009] Furthermore, there are two cast iron nozzle structures, which are relatively arranged on both sides of the outlet side of the molten iron flow channel, and the two cast iron nozzle structures and the molten iron flow channel form a Y-shaped structure.

[0010] The utility model has the following advantages and technical effects: due to the adoption of the above technical scheme, under the cooling effect of the cooling chamber, the slag-iron mixture at the nozzle outlet can fall off by itself or fall off by a slight touch during the operation of the mold, thereby ensuring the smooth flow of molten iron and the uniform pouring of the casting; at the same time, the temperature on the outlet side of the nozzle trough body is effectively controlled, reducing the concentration of thermal stress caused by high temperature, thereby reducing the risk of deformation and damage of the nozzle due to thermal stress and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of a cast iron nozzle provided by an embodiment of the utility model;

[0012] Figure 2 It is a schematic diagram of the AA section provided by an embodiment of the utility model;

[0013] Figure 3 It is a schematic diagram of the structure of a molten iron flow channel provided by an embodiment of the utility model.

[0014] In the figure: 1. nozzle trough body; 2. cooling water trough; 2-1. cooling chamber; 3. water inlet; 4. water inlet pipe; 5. water outlet; 6. partition; 7. iron receiving trough body; 8. iron chute body. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0016] It should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0017] As Figure 1 and Figure 2 shown, on the one hand, the present application provides a cast iron nozzle structure, including a nozzle trough body 1. A cooling water trough 2 is provided on the lower end surface of the trough bottom plate on the outlet side of the nozzle trough body 1. The cooling water trough 2 and the trough bottom plate enclose a sealed cooling chamber 2-1. An inlet 3 is provided on the side wall of the cooling water trough 2 near the outlet side of the nozzle trough body 1. The inlet 3 is connected to an external cooling water source through a water inlet pipe 4. An outlet 5 is provided on the bottom plate of the cooling water trough 2 far from the outlet side of the nozzle trough body 1. The inlet 3 is arranged near the outlet side of the nozzle trough body 1, which means that the cooling water can first contact the part that most needs to be cooled, that is, the area where the slag-iron mixture is most likely to accumulate and adhere. This design enables the cooling water to more effectively reduce the temperature of this area, reduce thermal stress, prevent the formation of slag-iron mixture and damage to the nozzle.

[0018] Furthermore, at least two partition plates 6 are arranged in the cooling chamber 2-1 between the inlet 3 and the outlet 5. The adjacent partition plates 6 are arranged staggeredly to form an S-shaped flow channel. Extending the residence time of the cooling water in the cooling chamber 2-1 helps to make more full use of the heat exchange capacity of the cooling water, improve the cooling effect on the nozzle trough body 1 and its surrounding components; it can be more evenly distributed in each area of the cooling chamber 2-1, avoiding the situation of local overheating or insufficient cooling, and further improving the uniformity and efficiency of cooling.

[0019] Furthermore, a refractory layer is cast in the nozzle trough body 1.

[0020] As Figure 3 shown, on the other hand, the present application provides an iron water trough, including a molten iron receiving trough body 7 and a molten iron discharging trough body 8. The outlet side of the molten iron discharging trough body 8 is connected and provided with any one of the above-mentioned cast iron nozzle structures.

[0021] Furthermore, two of the cast iron nozzle structures are provided, and the two cast iron nozzle structures are oppositely arranged on both sides of the outlet side of the iron water trough. The two cast iron nozzle structures and the iron water trough form a Y-shaped structure.

[0022] During use, the flow rate of the cooling water in the water inlet pipe 4 is adjusted through a valve to achieve the adjustment of the cooling intensity. The cooling water enters the cooling chamber 2-1 to cool the nozzle trough 1, and the cooled cooling water flushes onto the lower iron unloading plate through the water outlet 5. Due to the above technical solution, under the cooling effect of the cooling chamber 2-1, the slag-iron mixture at the nozzle outlet can fall off automatically or fall off slightly when the mold is running, thus ensuring the smooth flow of the molten iron and the uniform pouring of the casting; at the same time, the temperature on the outlet side of the nozzle trough 1 is effectively controlled, reducing the thermal stress concentration caused by high temperature, thereby reducing the risk of deformation and damage of the nozzle due to thermal stress and extending its service life.

[0023] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cast iron nozzle structure, comprising a nozzle trough body, characterized in that, A cooling water groove is provided at the lower end surface of the bottom plate of the trough body on the outlet side of the nozzle trough body. The cooling water groove and the bottom plate of the trough body enclose a sealed cooling chamber. An inlet is provided on the side wall of the cooling water groove close to the outlet side of the nozzle trough body. The inlet is connected to an external cooling water source through a water inlet pipe. A water outlet is provided on the bottom plate of the cooling water groove far from the outlet side of the nozzle trough body.

2. The cast iron nozzle structure according to claim 1, characterized in that, At least two partition plates are arranged in the cooling chamber between the inlet and the outlet. An S-shaped flow channel is formed by staggered arrangement between adjacent partition plates.

3. The cast iron nozzle structure according to claim 1 or 2, characterized in that, A refractory layer is cast in the nozzle trough body.

4. A molten iron launder, comprising a molten iron receiving trough body and a molten iron discharging trough body, characterized in that, The outlet side of the iron chute body is communicatively provided with the cast iron nozzle structure according to any one of claims 1 to 3 above.

5. The iron water chute according to claim 4, characterized in that, There are two cast iron nozzle structures. The two cast iron nozzle structures are oppositely arranged on both sides of the outlet side of the molten iron flow trough. The two cast iron nozzle structures and the molten iron flow trough form a Y-shaped structure.

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