CN219335953U

CN219335953U - Special pouring chute

Info

Publication number: CN219335953U
Application number: CN202320212216.9U
Authority: CN
Inventors: 常连波; 邢万里; 刘宏基; 魏儒赞; 白华彬; 刘苗苗
Original assignee: Handan Huiqiao Composite Material Technology Co ltd
Current assignee: Handan Huiqiao Composite Material Technology Co ltd
Priority date: 2023-02-15
Filing date: 2023-02-15
Publication date: 2023-07-14
Anticipated expiration: 2033-02-15

Abstract

The utility model discloses a special pouring chute for the casting industry, wherein the section of an inner molten iron runner is circular, and the inner molten iron runner comprises a chute cup, a ox horn chute, an inclined chute and a vertical chute which are sequentially communicated, so that a curved funnel shape is formed. The top surface of the molten iron runner at the lower part of the ox horn chute is provided with an air permeable plug, the top surface and the bottom surface of the pouring chute are respectively provided with an upper annular pipe and a lower annular pipe, wherein the upper annular pipe and the lower annular pipe are uniformly provided with upward air holes, and the upper annular pipe and the lower annular pipe are respectively communicated with the air supply pipe. The top cap is placed on the upper part of the pouring chute and comprises a top cap steel plate in the shape of a cotton slipper vamp, fire-resistant cotton and a shoe plate. The lower part of the pouring chute is connected with a pouring cup cover through threads. The utility model is matched with a fixed-point pouring truck, and the surface of the poured molten iron flow is isolated from air under the protection of gas, so that the non-oxidation pouring is realized.

Description

Special pouring chute

Technical Field

The utility model is applied to the field of casting, relates to a trolley for molten iron casting, and particularly relates to a trolley for fixed-point casting.

Background

In the casting industry, molten metal pouring is an indispensable procedure, a crown block is adopted for conventional pouring, a pouring ladle is lifted by a crown block, molten metal in the pouring ladle is poured into a pouring cup at a pouring station, and the molten metal enters a cavity through a pouring system to form a casting. When the liquid is poured, the surface of the molten metal is necessarily contacted with air, so that the molten metal is oxidized, and oxide inclusions are formed in the casting. The casting is pure, a special chute is preferably used, and air is isolated during casting of molten metal, so that non-oxidation casting is realized.

The publication No. CN205183756U shows a magnesium alloy valve type casting system, which comprises a filter residue guide pipe, a piston type flow control valve, a valve body heating device, a sectional type heat insulation piston guide rod, a piston driving mechanism, a discharge hole, a protective gas input port and the like, wherein magnesium alloy melt enters a casting mould from the discharge hole through a casting system from the inside of the furnace, and protective gas is uniformly distributed inside the discharge hole to protect the magnesium alloy melt and avoid air oxidation. The casting system can be used for magnesium alloy with the melting point of 650 ℃ and can not be used for casting steel metal liquid with the melting point of more than 1200 ℃. The publication No. CN103537659A discloses a slag blocking pouring basin, wherein a slag blocking dam is arranged in the basin, a communicating port is arranged at the bottom of the dam, a pouring gate is arranged at the bottom of the basin behind the dam, molten iron is paid in the basin in front of the dam, foreign slag floats upwards, and the molten iron flows into the basin behind the dam from the communicating port and is cast through the pouring gate. The slag blocking pouring basin is suitable for continuous casting or casting of heavy castings, can only block external slag, and has no effect on self-generated slag generated by contact of molten iron and air. The publication No. CN208450598U shows a pouring ladle slide nozzle which is suitable for centrifugal casting, an inert gas pipe die outlet of the slide nozzle is used for feeding inert gas into the pipe die, and an inert gas baffle outlet of the slide nozzle is used for closing air of the pouring nozzle, so that the molten steel is prevented from being oxidized by contact with the air in the process of entering the pipe die from the pouring ladle and in the subsequent cooling process. The publication No. CN210730971U discloses a tundish for centrifugal casting, wherein the upper surface of a ladle opening is sealed with the bottom of a plunger ladle of molten steel, inert gas outlets are uniformly distributed on the ladle opening of the tundish, inert gas is fed into the tundish under the sealing condition of the ladle opening of the tundish, and the whole inert gas protection can not oxidize in the process of flowing molten steel from the plunger ladle into a pipe die. The combination of the two patents can realize the non-oxidation centrifugal casting of molten metal, but is not suitable for common sand casting.

Disclosure of Invention

The utility model solves the technical problems that: the special pouring chute is matched with the fixed-point pouring ladle, and the non-oxidation pouring of the molten iron isolation air is realized by using the low-cost protective gas.

The technical scheme adopted by the utility model is as follows: the special pouring chute consists of a chute steel plate and refractory materials, the section of the molten iron runner is circular, and the special pouring chute comprises a chute cup, a ox horn chute, an inclined chute and a vertical chute which are sequentially communicated, so that a curved funnel shape is formed. The inclined chute is mainly used for connecting a pouring point of a pouring ladle and a pouring cup point of a casting mould. The top surface of the molten iron runner at the lower part of the ox horn chute is provided with an air permeable plug, the top surface of the pouring chute is provided with an upper annular pipe, the bottom surface of the pouring chute is provided with a lower annular pipe, and the upper annular pipe, the air permeable plug and the lower annular pipe are respectively communicated with the air supply pipe. Upward air holes are uniformly distributed on the upper surface of the upper ring pipe, and downward air holes are uniformly distributed on the bottom surface of the lower ring pipe.

Further, a flat plate is fixed at the upper part of the pouring chute, and a top cap is placed on the flat plate. The top cap comprises a top cap steel plate in the shape of a cotton slipper vamp, fire-resistant cotton and a hoof-shaped plate. The middle of the shoe-shaped plate is provided with a round hole, and the round hole is sleeved on the upper part of the pouring chute. And the top hat steel plate is welded with the hoof-shaped plate, and the inner surface of the top hat steel plate is covered with fire-resistant cotton.

Further, the lower part of the pouring chute is connected with the pouring cup cover through threads, the threads are long-pitch threads, and the pouring cup cover can be quickly moved up and down by rotating the pouring cup cover.

Further, the air supply pipe is filled with cheap CO ₂ Or N ₂ Argon, natural gas and gas may also be used.

The utility model has the beneficial effects that: the utility model is matched with the fixed-point pouring truck for use and moves along with the pouring truck. The surface of the poured molten iron flow is isolated from air under the protection of gas, so that the non-oxidation pouring is realized.

Drawings

FIG. 1 is a schematic structural diagram of embodiment 1;

FIG. 2 is a schematic illustration of the fixed point casting of example 1;

FIG. 3 is a schematic structural diagram of embodiment 2;

FIG. 4 is a schematic view of the overcap A of FIG. 3;

FIG. 5 is a schematic illustration of fixed point casting of example 2;

wherein: 1-chute steel plate, 2-refractory, 3-chute cup, 4-ox horn chute, 5-inclined chute, 6-vertical chute, 7-lower ring pipe, 8-air pipe, 9-air permeable plug, 10-upper ring pipe, 11-pouring ladle, 12-rotating shaft, 13-iron water flow, 14-hydraulic cylinder, 15-flat plate, 16-top cap steel plate, 17-refractory cotton, 18-hoof plate and 19-pouring cup cover.

Detailed Description

Example 1.

The structure of the pouring chute in the embodiment is shown in figure 1, and the pouring chute consists of a chute steel plate 1 and refractory materials 2, wherein the section of a middle molten iron runner is circular, and comprises a chute cup 3, a ox horn chute 4, an inclined chute 5 and a vertical chute 6 which are sequentially communicated, so that a curved funnel shape is formed. The chute cup 3 is used for receiving molten iron in the fixed-point pouring ladle. The ox horn chute 4 is a smooth arc transition section with gradually reduced inner diameter and is used for changing the flowing direction of molten iron from vertical flowing to transverse flowing. The vertical chute 6 is used for introducing molten iron into a pouring cup of a casting mould, the inclined chute 5 is communicated with the ox horn chute 4 and the vertical chute 6, the main functions of the vertical chute are used for connecting a pouring point of a pouring ladle and a pouring cup point of the casting mould, and the inclined chute is beneficial to avoiding the generation of residual iron in the chute caused by the local damage of refractory materials in the chute, so that unnecessary trouble is brought to cleaning.

The top surface of the runner at the lower part of the ox horn chute 4 is provided with an air permeable plug 9, the top surface of the pouring chute is provided with an upper annular pipe 10, the outlet of the vertical chute 6 and the bottom surface of the pouring chute are provided with a lower annular pipe 7, and the lower annular pipe 7, the air permeable plug 9 and the upper annular pipe 10 are respectively communicated with the air supply pipe 8. In order to facilitate the knotting of refractory materials, the upper ring pipe 10 and the lower ring pipe 7 are fixed on the outer surface of the chute steel plate 1, a plurality of upward rows of ventilation holes are uniformly distributed on the upper ring pipe 10, a plurality of downward rows of ventilation holes are uniformly distributed on the bottom surface of the lower ring pipe 7, and when gas is discharged through the ventilation holes, a molten iron runner can be separated from surrounding air, so that no oxidation pouring of molten iron in the runner is realized. The ventilation plug 9 is made of refractory materials, is purchased externally, can be used for introducing gas into the molten iron runner, can be used for discharging air in the molten iron runner, and can prevent molten iron from contacting the ventilation plug 9 and protect the surface of flowing molten iron from isolating air especially in the process of casting molten iron.

In the embodiment, the pouring ladle 11 is turned around the rotating shaft 12 under the action of the hydraulic cylinder 14, the rotating shaft 12 is positioned at the spout of the pouring ladle, and the pouring ladle is turned over, so that the spout position is unchanged, and fixed-point pouring is realized. Molten iron in the pouring ladle flows into the chute cup 3 at fixed points and flows into the casting mould through the ox horn chute 4, the inclined chute 5 and the vertical chute 6. The molten iron flows out from the spout, and the molten iron flow 13 is in the protection range of gas, and isolates air, thereby realizing non-oxidation pouring.

The gas is preferably inexpensive CO ₂ Or N ₂ 。N ₂ The density of the gas is slightly smaller than that of air, and the gas is inert gas. CO ₂ The density is higher than that of air, and the heat expansion rises under the condition of heating the molten iron flow, so that the effect of protecting the molten iron flow can be achieved. Another reason for the selection of the two gases is that the CO is introduced before casting ₂ Or N ₂ Is easy to enter the casting mould and can exhaust the air in the casting mould. Of course, inert gases such as argon can be used, but the price is relatively high, which is not beneficial to industrial production. Natural gas or coal gas may also be used, but is required to be used in combination with an open flame.

Example 2.

Example 1 in actual production casting, molten iron in a casting ladle is covered with protective slag to isolate air and prevent oxidation, molten iron flow 13 flowing out of a sliding nozzle of the casting ladle is isolated from air and prevents oxidation under the protection of gas, and the sliding nozzle is not covered with the protective slag due to slag blocking casting, and the gas cannot completely cover the sliding nozzle of the casting ladle, so that the surface of the molten iron at the sliding nozzle contacts with air and is oxidized to generate a small amount of autogenous oxide inclusion. For this purpose, an improvement was made on the basis of example 1, this example.

The structure of the embodiment is shown in fig. 3 and fig. 4. The lower ring pipe 7 and the upper ring pipe 10 of the pouring chute are respectively fixed on the inner surface of the chute steel plate 1, and when the refractory 2 is disassembled, protection is achieved, dust is prevented from blocking the ventilation holes, and rough operation deformation is avoided.

The upper part of the pouring chute is fixedly welded with a flat plate 15, and a top cap is placed on the flat plate 15. The top cap comprises a top cap steel plate 16, fire resistant cotton 17, and a shoe plate 18 (here the shoe refers to a horseshoe). The middle of the hoof-shaped plate 18 is provided with a round hole, the round hole is sleeved on the upper part of the pouring chute, the hoof-shaped plate 18 is in plane contact with the flat plate 15, air isolation is facilitated, and the box sealing paste is adopted for sealing during use. The top hat steel plate 16 is welded and sealed with the hoof-shaped plate 18, and the top hat steel plate 16 is shaped like the vamp of a cotton slipper. The inner surface of the top hat steel plate 16 is covered with refractory cotton 17, and the refractory cotton 17 is used for preventing radiant heat of molten iron from being transferred to the top hat steel plate 16, so that the top hat steel plate 16 deforms due to thermal stress, and the purpose of prolonging the service life is achieved.

The lower part of the pouring chute is provided with a pouring cup cover 19 which is in threaded connection with the chute steel plate 1 at the lower part, the threads are long-pitch threads, and the pouring cup cover 19 can be quickly moved up and down by rotating the pouring cup cover 19. In use, the rotary pouring cup cover 19 moves downwards to cover the casting pouring cup, and air can be prevented from entering from the lower ring pipe 7. After the casting is finished, the pouring cup cover 19 is lifted up, and the pouring chute is moved to the pouring cup of the next casting mould.

In this embodiment, the fixed-point pouring is shown in fig. 5, the air in the molten iron runner is discharged by the air fed by the air permeable plug 9, the air fed by the lower ring pipe 7 is prevented from entering the pouring cup cover 19, the air in the top cap is discharged by the air fed by the upper ring pipe 10, and the flowing air can cover the pouring ladle nozzle, so that the molten iron at the nozzle is prevented from being oxidized.

The air pressure of the air-permeable plug 9 is small, the flow rate is also small, and the discharged air is satisfied. The pressure of the gas sent out by the lower ring pipe 7 is small, so that dust on the surface of the molding sand is prevented from being blown up in the moving process, and the gas is filled into a pouring cup of another casting mold, thereby meeting the requirement of isolating air. The pressure of the gas sent out by the upper ring pipe 10 is larger than that of the lower ring pipe 7, and the flow is larger, so that the requirement of covering the pouring ladle nozzle by the gas flowing out by the top cap is met.

In the embodiment, on the basis of the embodiment 1, a pouring cup cover 19 is added at the lower part, and a top cap is added at the upper part, so that the poured molten iron can be poured in an anaerobic environment isolated from air. The cup cover 19 and the top cap can be used independently, but the combined use effect is better.

The utility model is matched with the fixed-point pouring truck for use and moves along with the pouring truck. The casting ladle is used for slag blocking casting, the surface of the molten iron flow is isolated from air under the protection of gas, the generation of molten iron autogenous oxide inclusion is avoided, and the purpose of purifying castings is achieved. The utility model is applied to the pouring of high-chromium cast iron castings, realizes the fixed-point flow-following addition of the metamorphic inoculant, and is pure with a ceramic filter screen in a pouring system, thereby greatly improving the toughness of wear-resistant castings.

Claims

1. The section of the molten iron runner is circular, and the special pouring chute is characterized in that: the molten iron runner comprises a chute cup (3), a ox horn chute (4), an inclined chute (5) and a vertical chute (6) which are sequentially communicated, so that a curved funnel shape is formed; the top surface of a molten iron runner at the lower part of the ox horn chute (4) is provided with an air permeable plug (9), the top surface of the pouring chute is provided with an upper annular pipe (10), the bottom surface of the pouring chute is provided with a lower annular pipe (7), and the lower annular pipe (7), the air permeable plug (9) and the upper annular pipe (10) are respectively communicated with an air supply pipe (8); upward air holes are uniformly distributed on the upper surface of the upper ring pipe (10), and downward air holes are uniformly distributed on the bottom surface of the lower ring pipe (7).

2. A special pouring spout as claimed in claim 1, wherein: the upper part of the pouring chute is fixed with a flat plate (15), a top cap is placed on the flat plate (15), and the top cap comprises a top cap steel plate (16) with a cotton-towed vamp, fire-resistant cotton (17) and a hoof-shaped plate (18); a round hole is formed in the middle of the shoe-shaped plate (18), and the round hole is sleeved into the upper part of the pouring chute; the top hat steel plate (16) is welded with the hoof-shaped plate (18), and the inner surface of the top hat steel plate (16) is covered with fireproof cotton (17).

3. A special pouring spout as claimed in claim 1, wherein: the lower part of the pouring chute is connected with a pouring cup cover (19) through threads.

4. A special pouring spout as claimed in claim 1, wherein: CO is introduced into the air supply pipe (8) ₂ Or N ₂ 。