A gating device for reducing slag inclusion in a ductile iron casting

Abstract

The utility model provides a kind of pouring device for reducing nodular cast iron casting inner slag, belong to the technical field of foundry mould, including sprue cup.The utility model is provided with plug body assembly, before pouring operation starts, isolation plug is plugged to discharge port, iron water is poured into sprue cup, iron water gradually fills sprue cup internal space, when the iron water in sprue cup reaches appropriate amount, slag will be assisted by buoyancy and float naturally to the surface of iron water, at this time, by lifting hook ring, isolation plug is pulled out vertically upwards, opens discharge port, relatively clean iron water will flow into subsequent runner by discharge port, provide high-quality iron water for casting mold filling, carry out pouring operation, when it is observed that the iron water in sprue cup is about to be emptied, surface layer slag is about to be sucked to discharge port, by operating hook ring, isolation plug is moved downwards quickly, re-plugs discharge port, most of the slag floating on the surface is intercepted and discarded in sprue cup.

Description

Technical Field

[0001] This utility model relates to the field of casting mold technology, and more specifically, to a casting device for reducing internal slag in ductile iron castings. Background Technology

[0002] Cast iron is a general term for alloys mainly composed of iron, carbon, and silicon. In these alloys, the carbon content exceeds the amount that can be retained in the austenite solid solution at the eutectic temperature. Items cast from molten iron are collectively called cast iron parts.

[0003] A search revealed that Chinese Patent Publication No. CN222153848U discloses "a casting device for reducing internal slag in ductile iron castings, specifically relating to the field of casting molds, including a mold plate, an upper filter in the middle of the top surface of the mold plate, a lower filter in the middle of the bottom surface of the mold plate, the upper and lower filters being symmetrically arranged on both sides of the mold plate, a pouring cup at the top of the upper filter, a sprue fixedly connected between the pouring cup and the upper filter, a sprue at the bottom of the mold plate, an ingate overlapping one side of the sprue, and the sprue and ingate being connected as one unit. This utility model, by providing a filter block, riser, and positioning pin, facilitates the rapid positioning and installation of the filter block, and also facilitates the initial turbulence and filtration of molten iron, ensuring that the molten iron flows cleanly and steadily into the casting cavity. Multiple filtration reduces internal slag production, and also facilitates the separation of the casting from the riser, improving the surface and processing quality of the casting, and making casting cleaning more convenient." However, it still has the following drawbacks: The device uses a single filtration method, relying solely on filter blocks for mechanical filtration. It lacks active means of isolating molten slag, and all impurity interception is concentrated on the filter blocks. This results in a heavy filtration load on the filter blocks, which gradually become clogged with impurities during the long casting process, leading to a decrease in filtration efficiency.

[0004] Therefore, a casting device for reducing internal slag in ductile iron castings is proposed. Utility Model Content

[0005] The purpose of this invention is to address the problem that current casting devices rely solely on mechanical filtration through filter blocks, lacking active means of slag isolation. All impurity interception is concentrated on the filter blocks, resulting in a heavy filtration load and gradual blockage by impurities during prolonged casting, leading to decreased filtration efficiency. This invention provides a casting device that reduces slag in ductile iron castings to solve the aforementioned problems.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution: The present invention is as follows: a pouring device for reducing internal slag in ductile iron castings, including a pouring cup, wherein a plug assembly is provided inside the pouring cup to prevent molten slag from entering during pouring, a power assembly is provided on one side of the plug assembly, and a filter assembly for filtering slag and reducing internal slag is provided at the bottom of the plug assembly. The plug assembly includes a discharge port fixedly opened at the bottom of the pouring cup, an isolation plug is provided inside the pouring cup, a hook is fixedly installed on the top of the isolation plug, and the isolation plug is located above the discharge port.

[0007] As a preferred technical solution of this utility model, the power assembly includes a telescopic cylinder fixedly installed on one side of the pouring cup, a push rod is installed at the output end of the telescopic cylinder, a connecting rod is fixedly installed at the other end of the push rod, a connecting ring is fixedly installed at the bottom of the connecting rod, and the connecting ring is engaged with a hook ring.

[0008] As a preferred technical solution of this utility model, the filter assembly includes a direct pouring channel bolted to the bottom of the pouring cup, the direct pouring channel being connected to the interior of the pouring cup, and a first ceramic filter screen being fixedly installed inside the direct pouring channel.

[0009] As a preferred technical solution of this utility model, a horn-shaped gating channel is fixedly installed at the other end of the direct gating channel, and a pouring pipe is fixedly connected to the other end of the horn-shaped gating channel.

[0010] As a preferred technical solution of this utility model, a slag discharge pipe is fixedly connected to the top of the pouring pipe, and the slag discharge pipe is located above the horn-shaped pouring channel.

[0011] As a preferred embodiment of this invention, a sealing bushing is fixedly installed at the end of the isolation plug, and the sealing bushing is located above the discharge port.

[0012] As a preferred technical solution of this utility model, a second ceramic filter screen is fixedly installed inside the horn-shaped sprue, and the second ceramic filter screen is located on one side of the first ceramic filter screen.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By using a plug assembly, molten iron can be allowed to settle completely within the pouring cup, effectively trapping slag inside. Specifically, molten iron is poured into the pouring cup, gradually filling the internal space. When the amount of molten iron in the pouring cup reaches a suitable level, the slag will naturally float to the surface of the molten iron due to buoyancy. By operating the plug assembly, the discharge port can be accurately opened after the molten iron has settled, allowing clean molten iron to flow smoothly into the gating channel. The discharge port can be closed in time before the slag on the surface is sucked out, trapping the slag inside the pouring cup. This effectively prevents slag from entering the mold and significantly reduces the probability of internal slag defects. 2. The automatic opening and closing control of the isolation plug is achieved through the set power component. Specifically, the push rod moves upward synchronously with the extension of the output end of the telescopic cylinder, thereby driving the connecting rod and connecting ring to move upward as well. Since the connecting ring is engaged with the hook ring on the top of the isolation plug, the movement of the connecting ring will pull the isolation plug through the hook ring. Under the action of the pulling force, the isolation plug gradually moves upward, and the discharge port is opened. At this time, the relatively clean molten iron in the pouring cup after settling can flow into the subsequent gating channel through the discharge port, which is convenient for pouring operations. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the casting device for reducing internal slag in ductile iron castings provided by this utility model; Figure 2 A side view of the pouring device for reducing slag in ductile iron castings provided by this utility model; Figure 3 A side enlarged structural diagram of the casting device for reducing internal slag in ductile iron castings provided by this utility model; Figure 4 A schematic diagram of the bottom structure of the casting device for reducing internal slag in ductile iron castings provided by this utility model; Figure 5 A cross-sectional structural schematic diagram of the casting device for reducing internal slag in ductile iron castings provided by this utility model.

[0015] The diagram shows: 1. Pour cup; 2. Plug assembly; 201. Outlet; 202. Isolation plug; 203. Hook ring; 3. Power assembly; 301. Telescopic cylinder; 302. Push rod; 303. Connecting rod; 304. Connecting ring; 4. Filter assembly; 401. Sprue; 402. First ceramic filter screen; 5. Horn-shaped sprue; 6. Pour pipe; 7. Slag outlet pipe; 8. Sealing bushing; 9. Second ceramic filter screen. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0017] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0018] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] like Figure 1 and Figure 2 As shown, this embodiment proposes a pouring device for reducing internal slag in ductile iron castings, including a pouring cup 1, a plug assembly 2 for preventing molten slag from entering during pouring, a power assembly 3 for one side of the plug assembly 2, and a filter assembly 4 for filtering slag and reducing internal slag at the bottom of the plug assembly 2. like Figure 3 and Figure 5 As shown, the plug assembly 2 includes a discharge port 201 fixedly opened at the bottom of the pouring cup 1, an isolation plug 202 is provided inside the pouring cup 1, a hook ring 203 is fixedly installed on the top of the isolation plug 202, and the isolation plug 202 is located above the discharge port 201. In use, before the pouring operation begins, the isolation plug 202 seals the outlet 201, and molten iron is poured into the pouring cup 1. The molten iron gradually fills the internal space of the pouring cup 1. When the molten iron in the pouring cup 1 reaches a suitable amount, since the density of the slag is much smaller than that of the molten iron, the slag will naturally float to the surface of the molten iron by means of buoyancy. At this time, by lifting the hook ring 203, the isolation plug 202 is pulled vertically upward, and the outlet 201 is opened. The relatively clean molten iron will flow into the subsequent gating channel through the outlet 201, providing high-quality molten iron for filling the mold of the casting and carrying out the pouring operation. When it is observed that the molten iron in the pouring cup 1 is about to be emptied and the surface slag is about to be sucked towards the outlet 201, the isolation plug 202 is quickly moved downward by operating the hook ring 203 to reseal the outlet 201, intercepting and discarding most of the slag floating on the liquid surface in the pouring cup 1, preventing it from entering the mold, and further reducing the probability of internal slag generation.

[0021] like Figure 3 and Figure 4As shown, the power assembly 3 includes a telescopic cylinder 301 fixedly installed on one side of the pouring cup 1. A push rod 302 is installed at the output end of the telescopic cylinder 301, and a connecting rod 303 is fixedly installed at the other end of the push rod 302. A connecting ring 304 is fixedly installed at the bottom of the connecting rod 303, and the connecting ring 304 is engaged with the hook ring 203. In use, the push rod 302 moves upward synchronously with the extension of the output end of the telescopic cylinder 301, thereby driving the connecting rod 303 and the connecting ring 304 to move upward as well. Since the connecting ring 304 is engaged with the hook ring 203 at the top of the isolation plug 202, the movement of the connecting ring 304 will pull the isolation plug 202 through the hook ring 203. Under the action of the pulling force, the isolation plug 202 gradually moves upward, and the discharge port 201 is opened. At this time, the relatively clean molten iron in the pouring cup 1 after settling can flow into the subsequent gating channel through the discharge port 201, which facilitates the pouring operation.

[0022] like Figure 4 and Figure 5 As shown, the filter assembly 4 includes a sprue 401 bolted to the bottom of the pouring cup 1. The sprue 401 is connected to the interior of the pouring cup 1, and a first ceramic filter screen 402 is fixedly installed inside the sprue 401. Molten iron first flows from the pouring cup 1 into the sprue 401, which is connected to its interior. The first ceramic filter screen 402 has numerous small and regularly or irregularly distributed mesh holes, which can effectively intercept impurities such as slag and oxide scale in the molten iron, greatly improving the purity of the molten iron and further reducing the generation of slag in the ductile iron casting.

[0023] like Figure 4 and Figure 5 As shown, a horn-shaped sprue 5 is fixedly installed at the other end of the sprue 401, and a pouring pipe 6 is fixedly connected to the other end of the horn-shaped sprue 5. When molten iron flows in the horn-shaped sprue 5, its flow direction and speed will change in an orderly manner due to the influence of the shape of the horn-shaped sprue 5. During the flow process, the molten iron will gradually adjust its own flow state, reduce the generation of turbulence and splashing, and finally be accurately injected into the casting cavity through the pouring pipe 6 to complete the entire pouring process.

[0024] like Figure 5 As shown, a slag venting pipe 7 is fixedly connected to the top of the pouring pipe 6, and the slag venting pipe 7 is located above the horn-shaped gating system 5. During the pouring process, molten iron is continuously poured into the casting cavity through the pouring pipe 6. As the molten iron is continuously poured in, the gas generated by the molten iron at high temperature and some tiny slag particles are discharged to the outside of the pouring pipe 6 through the slag venting pipe 7, which helps to improve the overall performance of the casting.

[0025] like Figure 5As shown, a sealing bushing 8 is fixedly installed at the end of the isolation plug 202, and the sealing bushing 8 is located above the discharge port 201. The sealing bushing 8 is made of high-toughness ceramic fiber material, which can effectively fill the microscopic unevenness between the isolation plug 202 and the wall of the discharge port 201, preventing molten iron leakage.

[0026] like Figure 5 As shown, a second ceramic filter 9 is fixedly installed inside the horn-shaped gating 5, located on one side of the first ceramic filter 402. Molten iron flows out from the pouring cup 1 and passes sequentially through the first ceramic filter 402 and the second ceramic filter 9 located inside the horn-shaped gating 5, thereby achieving the gradual interception of impurities in the molten iron and reducing defects such as slag inclusions and porosity caused by the presence of internal slag in the ductile iron casting.

[0027] Specifically, in use, this slag-reducing casting device for ductile iron castings works as follows: Before the casting operation begins, the isolation plug 202 seals the outlet 201, and molten iron is poured into the pouring cup 1. The molten iron gradually fills the internal space of the pouring cup 1. When the amount of molten iron in the pouring cup 1 reaches a suitable level, because the density of the slag is much smaller than that of the molten iron, the slag will naturally float to the surface of the molten iron by means of buoyancy. At this time, by lifting the hook ring 203, the isolation plug 202 is pulled vertically upward, opening the outlet 201. The relatively clean molten iron will flow into the subsequent gating system through the outlet 201, filling the casting with slag. The casting process provides high-quality molten iron for pouring. When it is observed that the molten iron in the pouring cup 1 is about to be emptied and the surface slag is about to be sucked towards the discharge port 201, the isolation plug 202 is quickly moved downward by operating the hook ring 203 to re-seal the discharge port 201, thus trapping and discarding most of the slag floating on the liquid surface in the pouring cup 1. The first ceramic filter screen 402 has numerous small and regularly or irregularly distributed mesh holes, which can effectively intercept slag, oxide scale and other impurities in the molten iron, greatly improving the purity of the molten iron and further reducing the generation of slag in the ductile iron casting.

[0028] All technical features in this embodiment can be freely combined according to actual needs.

[0029] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A pouring apparatus for reducing slag in ductile iron castings, comprising a pouring cup (1), characterized in that, The pouring cup (1) is provided with a plug assembly (2) to prevent molten slag from entering during pouring. A power assembly (3) is provided on one side of the plug assembly (2). A filter assembly (4) is provided at the bottom of the plug assembly (2) to filter slag and reduce internal slag. The plug assembly (2) includes a discharge port (201) fixedly opened at the bottom of the pouring cup (1), and an isolation plug (202) is provided inside the pouring cup (1). A hook ring (203) is fixedly installed on the top of the isolation plug (202), and the isolation plug (202) is located above the discharge port (201).

2. The casting device for reducing slag in ductile iron castings according to claim 1, characterized in that, The power assembly (3) includes a telescopic cylinder (301) fixedly installed on one side of the pouring cup (1). A push rod (302) is installed at the output end of the telescopic cylinder (301). A connecting rod (303) is fixedly installed at the other end of the push rod (302). A connecting ring (304) is fixedly installed at the bottom of the connecting rod (303). The connecting ring (304) is engaged with the hook ring (203).

3. The casting device for reducing slag in ductile iron castings according to claim 1, characterized in that, The filter assembly (4) includes a sprue (401) bolted to the bottom of the pouring cup (1), the sprue (401) being connected to the interior of the pouring cup (1), and a first ceramic filter screen (402) being fixedly installed inside the sprue (401).

4. The casting device for reducing slag in ductile iron castings according to claim 3, characterized in that, The other end of the straight gating channel (401) is fixedly installed with a horn-shaped gating channel (5), and the other end of the horn-shaped gating channel (5) is fixedly connected with a pouring pipe (6).

5. A casting device for reducing slag in ductile iron castings according to claim 4, characterized in that, The top of the pouring pipe (6) is fixedly connected to a slag outlet pipe (7), which is located above the horn-shaped gating channel (5).

6. A casting device for reducing slag in ductile iron castings according to claim 1, characterized in that, A sealing bushing (8) is fixedly installed at the end of the isolation plug (202), and the sealing bushing (8) is located above the discharge port (201).

7. A casting device for reducing slag in ductile iron castings according to claim 4, characterized in that, A second ceramic filter (9) is fixedly installed inside the horn-shaped sprue (5), and the second ceramic filter (9) is located on one side of the first ceramic filter (402).

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