A centrifugal casting runner package

Abstract

The utility model discloses a flow channel package for centrifugal casting. The trolley and the package body adopt a connecting mode of screw rod inserting into sleeve pipe, and the upper and lower positions of the package body are adjusted by supporting nut. The horn flow channel is located in the middle of the package body, and the outer circumferential surface of the horn flow channel is pasted with electric heating wire, and the electric heating wire is inserted into the ceramic short pipe for easy bending. The outside of the electric heating wire is wrapped with refractory cotton. The electric heating wire extending out of the refractory cotton is sleeved into the ceramic pipe, and the electric heating wire is led out by the ceramic pipe. The refractory cotton and the shell are connected by refractory castable. The shell is connected with the flow nozzle fastener, and the flow nozzle pipe of the flow nozzle is aligned and sealed with the lower opening of the horn flow channel. In order to conveniently replace the horn flow channel, the flow channel package can adopt modular structure. In order to conveniently paste the electric heating wire, the corresponding groove of the electric heating wire is arranged on the outer surface of the horn flow channel. The utility model adopts electric heating horn flow channel, wraps the heat insulation layer, improves the heat utilization efficiency, and is suitable for the casting enterprises of centrifugal production.

Description

Technical Field

[0001] This invention is applied in the field of centrifugal casting and relates to a flow channel package for diverting molten metal into a mold, specifically a flow channel package with electric heating. Background Technology

[0002] Cast steel pipes have a large length-to-diameter ratio and are mostly cast using horizontal centrifugal casting. A ladle is needed to convert the downward pouring flow of molten steel into a horizontal flow. The molten steel is then guided into the horizontal mold by a nozzle, where it is centrifugally cooled at high speed to form the cast steel pipe. To reduce the temperature drop of the molten steel during its flow in the ladle and to ensure the pouring temperature before entering the mold, thus preventing poor pipe formation, the ladle and nozzle need to be heated to a high temperature, typically red-hot, before pouring. This allows the temperature of the molten steel in the ladle to be set as the pouring temperature. Currently, ladle heating often uses exothermic combustion of combustible gases. After combustion, the flow of the gas releases most of the heat into the surrounding environment, resulting in very low heat utilization efficiency during ladle heating. This heating method is suitable for steel mills where combustible gases are inexpensive, but it is not suitable for foundries, especially small foundries, as it actually increases the cost of ladle heating.

[0003] In centrifugal casting, the tundish not only guides the flow of molten metal but also directly affects process parameters such as the casting method and speed, as well as the quality of the cast steel pipe. CN201921474403.4 discloses a tundish with a refractory sealing gasket on the upper surface of the ladle opening to protect the gas during casting. CN202220491442.0 discloses a centrifugal casting tundish for cast steel pipes, where a plunger mechanism blocks the runner to achieve static separation of steel slag, and the casting speed is controlled by adjusting the opening and closing degree of the rotating mechanism. However, neither of these methods addresses the issue of heating.

[0004] To save on baking costs and facilitate baking of ladle bread, this invention uses electric heating to heat the ladle bread. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a flow channel for centrifugal casting, which uses electric heating wire to improve heating efficiency and is suitable for foundry enterprises.

[0006] The technical solution adopted in this utility model is as follows: a centrifugal casting trough package includes a trolley, a package body, and a nozzle. The package body includes an outer shell, castable refractory, heating wire, refractory cotton, a horn-shaped casting trough, a ceramic tube, and a short ceramic tube. The horn-shaped casting trough is located in the middle of the package body. A heating wire is attached to the outer circumference of the horn-shaped casting trough, and the heating wire is inserted and fitted inside the short ceramic tube. Refractory cotton is wrapped around the outside of the heating wire and the short ceramic tube. The heating wire extending out of the refractory cotton is fitted into the ceramic tube, and the ceramic tube leads the heating wire out of the package body. Refractory castable refractory is placed between the refractory cotton and the outer shell. The outer shell is fastened to the flange of the nozzle, and the nozzle tube is aligned and sealed with the lower opening of the horn-shaped casting trough.

[0007] Furthermore, to facilitate the replacement of the horn-shaped flow channel, the package body is configured as a modular structure, including an upper block, a front block, and a rear block. The upper block is a conical funnel shape, located at the upper opening of the horn-shaped flow channel; the front block is located on the front side of the horn-shaped flow channel and fixed to the outer shell; the rear block is located on the rear side of the horn-shaped flow channel and is threadedly connected to the outer shell by bolts. The nut of the bolt is located between the rear constraint plate and the front constraint plate, which are fixed to the rear block. The shank end of the bolt is machined with a through hole for easy tightening. Heating wires and refractory cotton are provided between the front block and the horn-shaped flow channel, and between the rear block and the horn-shaped flow channel.

[0008] Furthermore, before the heating wire is installed, the heating wire is bent and laid flat, and the width of the flat laying gradually decreases to adapt to the change in the diameter of the horn-shaped flow channel.

[0009] Furthermore, the outer surface of the horn-shaped flow channel is provided with grooves, which correspond to the application of the heating wire, and the size of the grooves corresponds to the outer diameter of the ceramic short tube. The grooves can constrain the heating wire, ensuring that the heating wire is applied correctly and preventing short circuits.

[0010] Furthermore, the refractory cotton can be replaced by aerogel cotton, which has better thermal insulation properties than refractory cotton.

[0011] Furthermore, a fixing screw is welded to the upper surface of the trolley, and the screw is threadedly connected to a support nut. A sleeve is welded to the outer shell, and the upper end of the screw is inserted into the sleeve, which is supported by the support nut. Adjusting the vertical position of the support nut can adjust the height of the package and the nozzle to accommodate different sizes of pipe molds.

[0012] Furthermore, the nozzle includes a nozzle tube, a resistance wire, a flange, a steel pipe, a castable layer, a refractory cotton layer, and a ceramic short tube. The resistance wire is spirally wound around the outer circumference of the nozzle tube, and the resistance wire is encased in the ceramic short tube. The outer layer of the resistance wire and the ceramic short tube is wrapped with a refractory cotton layer. The space between the refractory cotton layer and the steel pipe is a castable layer. A flange is welded to the installation end of the steel pipe.

[0013] The beneficial effects of this utility model are: This utility model uses electric heating wire to locally heat the horn-shaped flow channel and wraps it with an outer insulation layer, which improves the heat utilization efficiency and is very suitable for casting enterprises that produce centrifugal cast steel pipes. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of Example 1, and also... Figure 2 AA sectional view; Figure 2 for Figure 1 A top-view structural diagram; Figure 3 for Figure 2 Schematic diagram of the BB cross-sectional structure; Figure 4 This is a schematic diagram of the heating wire winding process. Figure 5 This is a schematic diagram of the main structure of Example 2; Figure 6 This is a schematic diagram of the lower horn-shaped flow channel structure in Example 3; Among them: 1-cart, 2-screw, 3-support nut, 4-sleeve, 5-outer shell, 6-castable material, 7-heating wire, 8-refractory cotton, 9-horn-shaped flow channel, 10-flow nozzle, 11-fastener, 12-ceramic tube, 13-ceramic short tube; 21-Upper block, 22-Front block, 23-Rear block, 24-Bolt, 25-Rear restraint plate, 26-Front restraint plate. Detailed Implementation

[0015] The term "front" refers to the direction of the nozzle, and "rear" refers to the direction away from the nozzle. "Up and down" refers to the relative position of this utility model in its usage state, and "inside and outside" refers to its position relative to the flow channel of molten steel. The terms "refractory cotton" and "aerogel cotton" both refer to high-temperature resistant, heat-insulating, and flexible materials with insulating properties. Example

[0016] The flow channel structure of this embodiment is shown in the attached figure. Figure 1-3 As shown, the device includes a trolley 1, a package body, and a spout 10. A fixing screw 2 is welded to the upper surface of the trolley 1, and a support nut 3 is threaded onto the screw 2. The upper end of the screw 2 is inserted into a sleeve 4, which is welded to the package body. The package body applies all its weight to the support nut 3 through the sleeve 4. In addition, the vertical height of the package body can be adjusted by adjusting the position of the support nut 3.

[0017] The package includes an outer shell 5, castable refractory 6, heating wire 7, refractory cotton 8, a horn-shaped channel 9, ceramic tubes 12, and ceramic short tubes 13. The outer shell 5 is made of weldable steel for easy welding and installation. The horn-shaped channel 9 is formed by tamping and drying refractory castable refractory and is made using a special mold. The inner mold is the forming cavity of the horn-shaped channel 9, with a diameter gradually decreasing from large to small, and the center lines of the upper and lower openings are perpendicular. The outer mold has a symmetrical opening and closing structure for easy demolding of the horn-shaped channel 9. The horn-shaped channel 9 is located in the middle of the package. Heating wire 7 is attached to the outer circumference of the horn-shaped channel 9 and inserted into several ceramic short tubes 13. The ceramic short tubes 13 insulate the heating wire and can accommodate the bending deformation of the heating wire. Refractory cotton 8 is wrapped around the outside of the heating wire 7 and the ceramic short tubes 13. The refractory cotton 8 serves as insulation to prevent heat loss and also helps to fix the heating wire. When the heating wire 7 extends out of the refractory cotton, it is inserted into the ceramic tube 12, from which the heating wire is led out for easy electrical connection. The ceramic tube 12 serves as insulation and heat insulation. Due to the change in the outer circle shape of the horn-shaped flow channel, the heating wire 7 can be divided into two identical parts, each as shown in the image. Figure 4 As shown, the refractory wool is first bent and laid flat on it, with its width gradually decreasing during laying to accommodate changes in the outer circumference of the horn-shaped flow channel. After the two heating wires are laid flat on the two pieces of refractory wool, the two pieces of refractory wool are then attached to the outer surface of the horn-shaped flow channel 9. The outer layer should preferably be wrapped with refractory cloth, and then fixed with refractory rope or thin iron wire to facilitate the fixation of the heating wires. It is then positioned inside the outer casing 5, and the castable refractory 6 is poured and tamped to fix the horn-shaped flow channel 9.

[0018] The nozzle 10 is connected to the package body via fasteners 11. The nozzle 10 includes a nozzle tube, a resistance wire, a flange, a steel pipe, a castable layer, a refractory cotton layer, and a ceramic short tube. See the utility model patent application for a nozzle for a trough package (application number 2025218713948), whose structure is described in detail therein. The resistance wire is spirally wound around the outer circumference of the nozzle tube, and this resistance wire is also encased in a ceramic short tube. The outer layer of the resistance wire and the ceramic short tube is wrapped with a refractory cotton layer. A castable layer lies between the refractory cotton layer and the steel pipe. A flange is welded to the mounting end of the steel pipe. The fasteners 11 are bolt and nut structures that connect the flange and the outer shell of the package body, allowing for quick installation and disassembly of the nozzle and facilitating nozzle replacement. The nozzle tube is aligned and sealed with the lower opening of the horn-shaped trough 9.

[0019] In this embodiment, the support nut 3 is adjusted according to the position of the mold centerline to ensure that the nozzle aligns with the center hole of the baffle. The nozzle and ladle are electrically heated. The top of the horn-shaped flow channel is covered with insulation cotton, and the outlet of the nozzle is also covered with insulation cotton to prevent heat loss. Thus, the horn-shaped flow channel and nozzle are electrically heated, and there is thermal resistance to outward heat dissipation, greatly improving heating efficiency. Before pouring, the insulation cotton is removed, the trolley is moved, and the nozzle is inserted into the center hole of the baffle. The molten steel in the ladle is poured immediately after temperature measurement. The molten steel enters the mold through the horn-shaped flow channel and nozzle, and after centrifugal cooling, it becomes a cast steel pipe.

[0020] Because the lengths of the lower and upper arcs of the horn-shaped flow channel differ significantly, placing heating wires on both sides would result in a denser arrangement of heating wires on the upper arc surface, leading to a higher heating temperature, while the lower arc surface would have a sparser arrangement, resulting in a lower heating temperature. To ensure a more consistent heating temperature across the upper and lower arc surfaces, it is advisable to place heating wires on both the upper and lower arc surfaces of the horn-shaped flow channel, as shown in the attached diagram. Figure 4 As shown. Example

[0021] This embodiment modularizes the package body, facilitating the replacement of the horn-shaped flow channel 9. (See attached...) Figure 5 As shown, the package includes an upper block 21 and a lower block. The upper block 21 is a conical funnel shape and is placed on top of the lower block, that is, on the top surface of the horn-shaped flow channel 9, located at the upper opening of the horn-shaped flow channel 9. The lower block includes a front block 22 and a rear block 23. The front block 22 is located on the front side of the horn-shaped flow channel 9 and is fixed to the outer shell 5. The rear block 23 is located on the rear side of the horn-shaped flow channel 9 and is threadedly connected to the outer shell 5 by bolts 24. The nuts of the bolts 24 are located between the rear constraint plate 25 and the front constraint plate 26. The rear constraint plate 25 and the front constraint plate 26 are fixed to the rear block 23. The rod end of the bolt 24 is machined with a through hole.

[0022] Between the front block 22 and the horn-shaped flow channel 9, and between the rear block 23 and the horn-shaped flow channel 9, heating wires and refractory cotton with the same structure as in Embodiment 1 are provided.

[0023] In this embodiment, heating wires are attached to the front and back of the horn-shaped flow channel, and refractory cotton is wrapped around it. It is then positioned between the front and rear blocks. A steel rod is inserted into the through hole of bolt 24 and bolt 24 is tightened. The nut of bolt 24 presses against the front constraint plate 26, causing the rear block 23 to move forward and engage with the front block 22, thus fixing the horn-shaped flow channel. Then, the upper block 21 is placed, achieving modular installation of the package. If the horn-shaped flow channel needs to be replaced, the upper block 21 is lifted, and bolt 24 is tightened in the opposite direction. The nut applies axial force to the rear constraint plate 25, causing the bolt to move the rear block 23 backward through the rear constraint plate. When the rear block contacts the outer shell, the backward movement stops, the horn-shaped flow channel is removed for replacement, and then the installation operation is performed, restoring the flow channel package to its usable state.

[0024] This embodiment is modular, enabling rapid replacement of the horn-shaped flow channel and the heating wire, thus saving refractory materials for the castable. Example

[0025] This embodiment is an improvement on embodiment 2. A groove is formed on the outer surface of the horn-shaped flow channel 9, corresponding to the attachment of the heating wire 7. The groove size corresponds to the outer diameter of the ceramic short tube 13, as shown in the attached figure. Figure 6 As shown.

[0026] In this embodiment, corresponding protruding ridges are set on the inner wall of the outer mold for the horn-shaped flow channel, forming a groove after the horn-shaped flow channel is formed. The heating wire is attached to the outer surface of the horn-shaped flow channel, fixed with tape, wrapped with refractory cotton, and secured with thin iron wire. The casting material is then knotted. Compared to Embodiment 2, this embodiment makes attaching the heating wire more convenient and faster, avoiding the drawback of rigidity recovery when the heating wire deforms, making the attachment of the heating wire more suitable for the requirements.

[0027] The aforementioned refractory cotton can be replaced by aerogel cotton, which has better high-temperature insulation properties than refractory cotton.

[0028] This invention utilizes electric heating wires to heat the horn-shaped flow channel, which is then wrapped with an insulation layer, thus improving heat utilization efficiency. To further reduce heat loss, refractory cotton can be used to cover the top of the flow channel during heating. The two heating wires have a power of 0.8-1.5kW and a voltage of 220V, and the heating temperature of the horn-shaped flow channel can reach over 800℃. This flow channel package is highly suitable for foundries producing centrifugal cast steel pipes.

Claims

1. A centrifugal casting ladle, comprising a carriage, a ladle body, and a spout; characterized in that: The package includes an outer shell (5), a castable (6), a heating wire (7), refractory cotton (8), a horn-shaped channel (9), a ceramic tube (12), and a ceramic short tube (13); the horn-shaped channel (9) is located in the middle of the package, and the heating wire (7) is attached to the outer circumference of the horn-shaped channel (9), and the heating wire (7) is inserted into the ceramic short tube (13); the heating wire (7) and the ceramic short tube (13) are wrapped with refractory cotton (8); the heating wire (7) extending out of the refractory cotton is inserted into the ceramic tube (12), and the heating wire (7) is led out of the package by the ceramic tube (12); the castable (6) is between the refractory cotton (8) and the outer shell (5). The outer shell is fastened to the flange of the nozzle, and the nozzle tube is aligned and sealed with the lower opening of the horn-shaped flow channel (9).

2. The centrifugal casting flow channel bag according to claim 1, characterized in that: The package includes an upper block (21), a front block (22), and a rear block (23); the upper block (21) is a conical funnel-shaped structure located at the upper opening of the horn-shaped flow channel (9); the front block (22) is located on the front side of the horn-shaped flow channel (9) and is fixed to the outer shell (5); the rear block (23) is located on the rear side of the horn-shaped flow channel (9) and is threadedly connected to the outer shell (5) by bolts (24), the nuts of the bolts (24) are located between the rear constraint plate (25) and the front constraint plate (26), the rear constraint plate (25) and the front constraint plate (26) are fixed to the rear block (23), and the rod end of the bolts (24) is machined with through holes; heating wires (7) and refractory cotton (8) are provided between the front block (22) and the horn-shaped flow channel (9), and between the rear block (23) and the horn-shaped flow channel (9).

3. A flow channel bag for centrifugal casting according to any one of claims 1 or 2, characterized in that: The heating wire (7) is bent and laid flat, and its width gradually decreases.

4. A flow channel bag for centrifugal casting according to any one of claims 1 or 2, characterized in that: The outer surface of the horn-shaped flow channel (9) is provided with a groove, which corresponds to the application of the heating wire (7), and the size of the groove corresponds to the outer diameter of the ceramic short tube (13).

5. A flow channel bag for centrifugal casting according to claim 4, characterized in that: The refractory cotton (8) is replaced with aerogel cotton.

6. A flow channel bag for centrifugal casting according to claim 1, characterized in that: A fixing screw (2) is welded to the upper surface of the trolley, and the screw (2) is threadedly connected to a support nut (3); a sleeve (4) is welded to the outer shell (5), and the upper end of the screw (2) is inserted into the sleeve (4), which is supported by the support nut (3).

7. A flow channel bag for centrifugal casting according to claim 1, characterized in that: The nozzle comprises a nozzle tube, a resistance wire, a flange, a steel pipe, a refractory layer, a refractory cotton layer, and a ceramic short tube. The resistance wire is spirally wound around the outer circumference of the nozzle tube, and the resistance wire is encased in the ceramic short tube. The outer layer of the resistance wire and the ceramic short tube is wrapped with a refractory cotton layer. The refractory cotton layer is separated from the steel pipe by a refractory layer. A flange is welded to the installation end of the steel pipe.

Images