Chute ladle for centrifugal casting

Abstract

The utility model discloses a chute ladle for centrifugal casting, which is applied to the field of centrifugal casting. The sliding nozzle is fixed on the pouring trolley and is of a two-half opening and closing structure, a flange plate of the sliding nozzle is fixedly connected with the outer wrapping body through a fastener, and a pipe cavity of the sliding nozzle is communicated with an ox horn inner cavity of the chute brick. The outer bag body comprises two symmetrical half bodies, the front part is provided with a fixed part, and the rear part is provided with a rotating part; two half symmetrical permanent materials are arranged in the outer bag body, the upper portion of the outer bag body is funnel-shaped, and a lower opening of the outer bag body is matched with an upper opening of the chute brick. The chute brick is of a split and matched two-half structure and is fixed through refractory mortar or heat preservation cotton. The two half split bodies of the chute brick are matched through a boss and a groove, and the shape of the boss and the shape of the groove are matched with the shape of the ox horn inner cavity. According to the utility model, an opening and closing split type is adopted, and the chute bricks are exposed, so that the cleaning of residual steel and the repairing of the chute bricks are facilitated.

Description

Technical Field

[0001] This utility model is applied in the field of centrifugal casting and relates to equipment used with centrifuges, specifically a centrifugal casting chute for guiding molten steel into a mold. Background Technology

[0002] Longer tubular castings are often produced using horizontal centrifuges. The mold is placed horizontally on the centrifuge's rollers, and a chute guides molten steel into the high-speed rotating mold. Under centrifugal force, the steel solidifies to form the tubular casting. The chute is typically made of an outer steel plate with an inner layer of refractory material, which is then dried before use. When the molten steel is poured at a low temperature, especially during pouring, the superheat is low, resulting in residual steel forming in the chute towards the end of the pouring process. Because the chute is a relatively enclosed space, cleaning this residual steel and repairing the chute wastes labor and time, potentially disrupting the pouring production schedule or pre-production preparation. For large-scale centrifugal production, chute cleaning and preparation are crucial steps.

[0003] CN217121683U discloses a centrifugal casting tundish for casting steel pipes. This tundish, mounted on a trolley, is designed with a horn-shaped gating system, a horizontal gating system with a gating nozzle, and a plunger mechanism. The plunger mechanism seals the gating system at the horn-shaped gating brick I. Horn-shaped gating brick I is installed through an opening at the gating nozzle position, mates with horn-shaped gating brick II for sealing, and then the gating nozzle is installed and fixed to a steel plate with fasteners. This tundish is suitable for workshops with good drying conditions. The horn-shaped gating brick I and the plunger head must be heated until red-hot; otherwise, the molten steel will easily solidify and freeze the plunger. Therefore, the problem of cleaning residual steel is essentially eliminated. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a centrifugal casting chute, which adopts a split-opening design, making it convenient for cleaning and repairing residual steel in the chute, and suitable for mass centrifugal casting production.

[0005] The technical solution adopted in this utility model is as follows: a centrifugal casting chute is fixed on a casting trolley by a fixing mechanism. It has a two-part opening and closing structure, including a nozzle, a chute brick, permanent material, a fixing component, an outer casing, and fasteners. The nozzle includes an integral nozzle pipe and a flange plate, which is fixedly connected to the outer casing by fasteners. The cavity of the nozzle pipe communicates with the inner cavity of the chute brick. The outer casing includes two symmetrical halves. A fixing component is installed at the front of the outer casing, and a rotating component is installed at the rear. Inside the outer casing are two symmetrical halves of permanent material. When the upper part of the permanent material is closed, it forms a funnel shape, and the lower opening of the funnel matches the upper opening of the chute brick. The chute brick is a two-part structure that fits together separately. The lower part of the permanent material is fixed with refractory mortar or insulation cotton.

[0006] Furthermore, to facilitate the positioning of the chute brick, the two halves of the chute brick are fitted with bosses and grooves, and refractory mortar is filled between the bosses and grooves to prevent molten steel leakage. The shape of the bosses and grooves conforms to the inner cavity of the horn.

[0007] Furthermore, the rotating component can also be replaced by a fixed component.

[0008] Furthermore, the fasteners are made of bolts and nuts or pins and wedges, and are used to assemble and fix the two halves of the outer casing.

[0009] Furthermore, a ball or small wheel is provided at the bottom of the outer casing to reduce the opening and closing friction of the two outer casing halves, making operation easier.

[0010] Furthermore, the rotating parts, fixing parts, and fasteners are wrapped and protected with refractory mortar or asbestos cloth to prevent splashed steel slag from affecting the movement or installation and removal of these components.

[0011] Furthermore, the rotating component includes a fixed rod and a rotating tube. The fixed rod is welded and fixed to the casting trolley, and the rotating tube is welded and fixed to the outer casing. The rotating tube is fitted with the fixed rod. Alternatively, the rotating component includes a rotating shaft and a rotating tube. The rotating shaft is inserted into the rotating tube and is welded and fixed to one half of the outer casing. The rotating tube is welded and fixed to the other half of the outer casing.

[0012] Furthermore, the fixing mechanism can adopt a structure of positioning pins and positioning holes, which is simple and convenient.

[0013] The beneficial effects of this utility model are: by setting the chute bag to an openable and split type, the chute bricks can be directly exposed, which facilitates the cleaning of residual steel inside the chute bricks and the repair of the chute bricks, saves the preparation time of the chute bag, and is suitable for batch centrifugal casting production. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of Embodiment 1, and also Figure 2 A schematic diagram of the AA cross-section;

[0015] Figure 2 for Figure 1 Top view;

[0016] Figure 3 for Figure 1 The left view;

[0017] Figure 4 for Figure 1 BB cross-sectional diagram;

[0018] Figure 5 This is a schematic diagram of the structure of Example 2;

[0019] Figure 6 This is a schematic diagram of the structure of Example 3;

[0020] Among them: 1-sluice, 2-sluice brick, 3-insulation cotton, 4-permanent material, 5-fixing parts, 6-outer body, 7-refractory mortar, 8-rotating parts, 9-fasteners;

[0021] 11-Dump pipe, 12-Flange plate;

[0022] 15-Rolling ball, 16-Fixed rod, 17-Positioning pin, 18-Small wheel. Detailed Implementation Example

[0023] The chute structure of this embodiment is shown in the attached figure. Figure 1-4 As shown, it is installed on the casting trolley and has a two-part opening and closing structure. It includes a chute 1, a chute brick 2, a permanent material 4, a fastener 5, an outer casing 6, and fasteners 9. The chute 1 includes a chute pipe 11 and a flange plate 12 with an integral structure. The flange plate 12 is fixedly connected to the outer casing 6 by the fasteners 9. The chute pipe 11 and the chute brick 2 are positioned by the mating of their concave and convex end faces, connecting the inner cavity of the chute brick and the cavity of the chute. During centrifugal casting, molten steel is guided from inside the chute brick into the mold.

[0024] The inner cavity of chute brick 2 is a horn-shaped pouring channel, as shown in the attached image. Figure 1 As shown, the entire surface is rounded with no dead corners. This structure helps reduce the resistance to molten steel flow. During casting, the potential energy of the molten steel is converted into kinetic energy, which can accelerate the centrifugal filling of the molten steel, especially necessary for the centrifugal casting of thin-walled long pipes. The chute brick 2 is a two-part structure that fits together separately and should be pre-sintered. Its mating surfaces are shown in the attached figure. Figure 4 The enlarged schematic diagram shows that the two halves of the split chute brick should use a combination of bosses and grooves for easy installation. Refractory mortar should be filled between them to prevent molten steel leakage from the self-fitting surface during pouring. The shape of the bosses and grooves follows the shape of the horn-shaped gating system. To reduce the resistance to molten steel flow, the chute bricks should preferably be made of smooth-surfaced carbonaceous refractory bricks.

[0025] The outer casing 6 comprises two symmetrically split halves, with a fixing component 5 mounted at the front and a rotating component 8 mounted at the rear. The rotating component 8 includes a rotating shaft and a rotating tube. The rotating tube is fixed to one outer casing half, and the rotating shaft is fixed to the other outer casing half. The rotating shaft is inserted into the rotating tube, and the two components work together to allow the two outer casing halves to rotate relative to each other. The fixing component 5 uses bolts and nuts to assemble and fix the two outer casing halves.

[0026] The outer casing 6 contains a permanent refractory lining 4, which is also composed of two symmetrical halves. When joined together, the upper part of the permanent lining forms a funnel shape with a large opening to facilitate the collection of molten steel. The lower opening of the funnel shape mates with the upper opening of the chute brick. The joint between the two halves is filled with refractory mortar to prevent residual steel from forming in the joint. After the two halves of the permanent lining are joined together, the assembly gap between them is sealed with refractory mortar to prevent molten steel leakage.

[0027] The chute brick 2 is fixed to the bottom of the permanent material 4 with refractory mortar, that is, the space between the two is filled with refractory mortar, so that the chute brick and the permanent material are fixed together. In order to increase the heat insulation effect of the chute brick and minimize the heat loss during molten steel pouring, the refractory mortar can be replaced with insulation cotton 3.

[0028] The attached diagram illustrates the pre-pouring state of the chute in this embodiment. After pouring, inspect the chute and chute bricks. If the chute needs replacement, simply remove fastener 9, replace the chute, apply refractory mortar to the mating surfaces of the chute and chute bricks, and then reinstall fastener 9. If it is necessary to clean the residual steel inside the chute bricks, remove the chute, then remove the nut of fixing part 5, unscrew the two outer casing halves, open the two halves of the split chute bricks, clean the residual steel, and repair the chute bricks. After cleaning and repair, screw the two outer casing halves back together, tighten the fixing parts, and then install the chute. This embodiment is particularly convenient for pouring accidents caused by molten steel solidifying inside the chute bricks due to chute pipe blockage. Simply open the two outer casing halves, remove the two halves of the split chute bricks and residual steel, replace the two halves of the split chute bricks, and install the chute; there is no need to damage the permanent material 4. Example

[0029] This embodiment is a modification of the above embodiment, as shown in the appendix. Figure 5 As shown, a ball bearing 15 is installed at the bottom of the chute package to facilitate the opening and closing of the two outer package halves. The rotating component includes a fixed rod 16 and a rotating tube. The fixed rod 16 is welded and fixed to the casting trolley. The rotating tube is welded and fixed to both outer package halves. The rotating tube is fitted with the fixed rod and can rotate around the fixed rod.

[0030] In this embodiment, during the pre-pouring process, i.e., when the nozzle extends into the mold, the outer casing needs to be secured by a special fixing mechanism to prevent the entire outer casing from rotating, as shown in the attached diagram. Figure 5 The locating pin 17 shown mates with the locating hole on the casting trolley. Example

[0031] The chute structure of this embodiment is shown in the attached figure. Figure 6 As shown, the two outer casing halves are changed from being screwed open in the above embodiment to being split open. The rotating component is replaced by a fixing component 5, and small wheels 18 are installed at the bottom of the casing to facilitate the opening and closing of the two outer casing halves. Similar to embodiment 2, a special fixing mechanism is required to secure the outer casing during casting to prevent it from moving.

[0032] It should be noted that: 1) In the above embodiments, the fixing parts and fasteners are bolts and nuts, or bar pins and wedge mechanisms can be used. Installation and disassembly only require hammering, which is more convenient. The fixing parts and fasteners are all existing technologies, and their structures will not be listed one by one. 2) Rotating parts, fixing parts, and fasteners should be wrapped and protected with refractory clay or asbestos cloth to prevent splashed steel slag from affecting the movement or installation and disassembly of these parts. 3) The fixing mechanism is existing technology. The attached figure only shows the positioning pin. Other fixing structures can also be used. 4) The above description uses molten steel as an example, but it can also be used for pouring molten iron or other molten metals. 5) This utility model is suitable for workshops that do not have the necessary drying conditions. The chute bricks and spouts can be preheated in the heating furnace and then directly installed after being taken out.

[0033] This invention improves the chute bag into a two-part opening and closing structure. By unscrewing or splitting it open, the chute bricks can be directly exposed, which facilitates the cleaning of residual steel and the repair of chute bricks, saves the preparation time of the chute bag, and is suitable for batch centrifugal casting production.

Claims

1. A centrifugal casting chute, fixed to a casting trolley by a fixing mechanism; characterized in that: The structure is a two-part opening and closing structure, including a chute (1), a chute brick (2), a permanent material (4), a fixing component (5), an outer casing (6), and fasteners (9). The chute (1) includes an integral chute pipe (11) and a flange plate (12). The flange plate (12) is fixedly connected to the outer casing (6) by fasteners (9). The cavity of the chute pipe (11) is connected to the horn-shaped inner cavity of the chute brick (2). The outer casing (6) includes two symmetrical halves. The fixing component (5) is installed at the front of the outer casing (6), and the rotating component (8) is installed at the rear. The outer casing (6) contains two symmetrical halves of permanent material (4). When the upper part of the permanent material (4) is closed, it is funnel-shaped. The lower opening of the funnel-shaped part matches the upper opening of the chute brick (2). The chute brick (2) is a two-part structure that is separated and fitted together. The lower part of the permanent material (4) is fixed with refractory mortar or thermal insulation cotton.

2. The centrifugal casting chute bag according to claim 1, characterized in that: The two halves of the chute brick (2) are fitted with bosses and grooves, and refractory mortar is filled between the bosses and grooves. The shape of the bosses and grooves follows the shape of the inner cavity of the ox horn.

3. The centrifugal casting chute bag according to claim 1, characterized in that: The rotating component (8) is replaced by the fixed component (5).

4. A centrifugal casting chute bag according to claim 1, characterized in that: The fastener (5) is assembled and fixed by bolts and nuts or pins and wedges to fix the two halves of the outer casing (6).

5. A centrifugal casting chute bag according to claim 1, characterized in that: A ball (15) or a small wheel (18) is provided at the bottom of the outer casing (6).

6. A centrifugal casting chute bag according to claim 1, characterized in that: The rotating part (8), the fixing part (5) and the fastener (9) are wrapped with refractory mortar or asbestos cloth.

7. A centrifugal casting chute according to claim 1, characterized in that: The rotating component (8) includes a fixed rod (16) and a rotating tube. The fixed rod (16) is welded and fixed on the casting trolley, and the rotating tube is welded and fixed on the outer casing. The rotating tube is fitted with the fixed rod (16).

8. A centrifugal casting chute according to claim 1, characterized in that: The rotating component (8) includes a rotating shaft and a rotating tube. The rotating shaft is inserted into the rotating tube and is welded and fixed to one half of the outer casing. The rotating tube is welded and fixed to the other half of the outer casing.

9. A centrifugal casting chute according to claim 1, characterized in that: The fixing mechanism consists of a positioning pin and a positioning hole.

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