A hot metal transfer system and transfer method

Abstract

A hot metal transfer system and a transfer method, wherein the hot metal transfer system includes a ladle transfer trolley (20) running between a casting liquid distribution station and a pouring station. A moving bracket (21) and a spheroidizing agent conveyor (22) are provided on the ladle transfer trolley (20). The spheroidizing agent conveyor (22) is installed on the moving bracket (21) and approaches or moves away from the ladle (30) through the moving bracket (21). During the process of the ladle transfer trolley (20) transferring the ladle (30), or during the time after the ladle transfer trolley (20) transfers the ladle (30) to the pouring station and before starting to pour the ductile iron hot metal raw material, the ductile iron hot metal raw material in the ladle (30) is spheroidized through the movement and conveying operations of the moving bracket (21) and the spheroidizing agent conveyor (22). The range of spheroidizing timing is broadened, the operation is simple, the control is flexible, the spheroidizing effect is good, and the applicable range is wide.

Description

Technical Field

[0001] The invention relates to the technical field of ductile iron casting production, and in particular to a molten iron transfer system and a transfer method, and is particularly applicable to a single-layer pipe or a multi-metal composite pipe for centrifugally casting ductile iron pipes. Background Art

[0002] When centrifugally casting ductile iron pipes, the spheroidized ductile iron molten iron raw materials are generally transferred to the casting mold for casting. Due to some uncontrollable situations encountered during the molten iron transfer and pouring waiting process, the casting is delayed, and the time from the pouring ladle receiving the ductile iron molten iron raw materials to the actual start of casting is long. The spheroidization of the spheroidized molten iron raw materials declines and the magnesium slag in the molten iron raw materials exceeds the standard, which affects the spheroidization effect and internal quality of the ductile iron pipe. At present, the industry will use the last spheroidizing process in the casting mold, such as the process of blowing spheroidizing agent, to make up for the above shortcomings. For example, Chinese utility model patent CN208840460U discloses a new hot mold centrifugal ductile iron pipe molten iron spheroidizing device, which is to spray spheroidizing agent in the pipe mold, but this type of operation requires special blowing equipment to assist the operation, and the technical requirements for the casting operation are also relatively high. Although there are also literatures that have given other means of implementing spheroidization in the casting mold, it is still necessary to perform some additional operations on the casting mold. Moreover, if the manufactured product is not a single-layer tube, but a multi-metal composite tube, many means cannot be used. Summary of the invention

[0003] In order to solve the problems raised in the background technology, the present invention seeks a breakthrough from the link of molten iron transfer, and provides a molten iron transfer system and a transfer method, which successfully solves the problem of controlling the timing of spheroidization by spheroidizing molten iron on a casting ladle transfer trolley, broadens the selection range of spheroidization timing, is easier to operate, more flexible to control, has a better spheroidization effect, and has a wider range of applications.

[0004] The technical solution of the present invention is as follows:

[0005] A molten iron transfer system, comprising a ladle transfer trolley running between a molten iron distribution station and a pouring station, wherein the molten iron distribution station has a ductile iron molten iron raw material ladle, and the pouring station has a pouring mold; the ladle transfer trolley carries the pouring ladle, receives the ductile iron molten iron raw material at the molten iron distribution station, transports the ladle to the pouring station and controls the ladle to pour the ductile iron molten iron raw material into the pouring mold;

[0006] A moving support and a spheroidizing agent conveyor are provided on the ladle transfer trolley. The spheroidizing agent conveyor is installed on the moving support and approaches or moves away from the ladle through the moving support. During the process of the ladle transfer trolley transporting the ladle, or during the time after the ladle transfer trolley transports the ladle to the pouring station and before starting to pour the ductile iron molten iron raw material, the ductile iron molten iron raw material in the ladle is spheroidized through the movement and conveying operations of the moving support and the spheroidizing agent conveyor.

[0007] For a molten iron transfer system as described above, the moving support is a column-beam type support that can move in the front-back direction of the ladle transfer trolley, and the spheroidizing agent conveyor is a spheroidizing container that can move in the up-down direction along the column-beam type support.

[0008] For a molten iron transfer system as described above, the casting mold is a centrifugal casting pipe mold and has a pouring port facing the ladle.

[0009] For a molten iron transfer system as described above, the ladle is a single-chamber ladle, and its lower part has a first pouring pipe that can be aligned with the pouring port of the casting mold.

[0010] For a molten iron transfer system as described above, the ladle is a multi-chamber ladle, and its lower part has a first pouring pipe and a second pouring pipe that can be aligned with the pouring port of the casting mold by adjusting the direction.

[0011] For a molten iron transfer system as described above, the adjustment of the direction is achieved by rotating the ladle on the rotary stage of the ladle transfer trolley by a certain angle.

[0012] A molten iron transfer method using the molten iron transfer system as described above includes the steps:

[0013] S1, the ladle transfer trolley carries the ladle, receives the ductile iron molten iron raw material distributed by the ductile iron molten iron raw material package at the molten metal distribution station and transports it to the pouring station;

[0014] S2, during the process of the ladle transfer trolley transporting the ladle, or after the ladle transfer trolley transports the ladle to the pouring station and before starting to pour the ductile iron molten iron raw material, the spheroidizing agent conveyor is sent above the ladle by moving the moving support forward, and the spheroidizing agent is transported downward through the spheroidizing agent conveyor to spheroidize the ductile iron molten iron raw material in the ladle;

[0015] S3. When the pouring time is reached, the ladle transfer trolley controls the ladle so that its first pouring pipe pours the ductile iron molten metal raw material into the pouring mold through the pouring port of the pouring mold. The ductile iron molten metal raw material fills the cavity under the action of centrifugal force and obtains ductile iron castings after cooling and solidification.

[0016] A molten metal transfer method using the molten metal transfer system as described above, which is applied to the manufacture of composite layer castings with a ductile iron material on the outer layer, includes the steps:

[0017] S1. The ladle transfer trolley carries the ladle, receives the ductile iron molten metal raw material distributed by the ductile iron molten metal raw material package in the first cavity of the ladle and the composite layer metal raw material distributed by the composite layer metal raw material package in the second cavity of the ladle at the molten metal distribution station, and transfers them to the pouring station.

[0018] S2. During the process of the ladle transfer trolley transferring the ladle, or after the ladle transfer trolley transfers the ladle to the pouring station and before starting to pour the ductile iron molten metal raw material, the spheroidizing agent conveyor is sent above the first cavity of the ladle by moving the moving support forward, and the spheroidizing agent is conveyed downward through the spheroidizing agent conveyor to spheroidize the ductile iron molten metal raw material in the first cavity of the ladle.

[0019] S3. When the pouring time of the ductile iron molten metal raw material is reached, the ladle transfer trolley controls the ladle so that the first pouring pipe of the first cavity pours the ductile iron molten metal raw material into the pouring mold through the pouring port of the pouring mold. The ductile iron molten metal raw material fills the cavity under the action of centrifugal force and starts the cooling and solidification process.

[0020] S4. When the pouring time of the composite layer metal raw material is reached, the ladle transfer trolley controls the ladle whose direction has been adjusted by the rotating platform so that the second pouring pipe of the second cavity pours the composite layer metal raw material into the pouring mold through the pouring port of the pouring mold. The composite layer metal raw material is compounded onto the already formed ductile iron inner layer under the action of centrifugal force and obtains composite layer castings with a ductile iron material on the outer layer after cooling and solidification.

[0021] A molten metal transfer method using the molten metal transfer system as described above, which is applied to the manufacture of composite layer castings with a ductile iron material on the inner layer, includes the steps:

[0022] S1. The ladle transfer trolley carries the ladle, receives the ductile iron molten metal raw material distributed by the ductile iron molten metal raw material package in the first cavity of the ladle and the composite layer metal raw material distributed by the composite layer metal raw material package in the second cavity of the ladle at the molten metal distribution station, and transfers them to the pouring station.

[0023] S2. During the process of the ladle transfer trolley (20) transferring the ladle (30), or after the ladle transfer trolley transfers the ladle to the casting station and before starting to pour the composite layer metal raw materials, or after the ladle transfer trolley starts to control the ladle to pour the composite layer metal raw materials from the second pouring pipe of the second cavity into the casting mold and before starting to pour the ductile iron molten iron raw materials, the spheroidizing agent delivery member is sent above the first cavity of the ladle by moving the moving bracket forward, and the spheroidizing agent is delivered downward through the spheroidizing agent delivery member to spheroidize the ductile iron molten iron raw materials in the first cavity of the ladle.

[0024] S3. When it reaches the pouring time of the ductile iron molten iron raw materials, the ladle transfer trolley controls the ladle whose direction has been adjusted by the rotary table so that the first pouring pipe of its first cavity pours the ductile iron molten iron raw materials into the casting mold through the pouring port of the casting mold. The ductile iron molten iron raw materials are compounded to the formed inner layer of the composite layer metal under the action of centrifugal force, and after cooling and solidification, a composite layer casting with a ductile iron material inner layer is obtained.

[0025] For the molten iron transfer method as described above, before the ladle adjusts its direction on the rotary table, the moving bracket moves the spheroidizing agent delivery member backward to its original position.

[0026] The beneficial effects of the present invention are as follows:

[0027] The molten iron transfer system and transfer method provided by the present invention seek a breakthrough from the molten iron transfer link, and successfully solve the control problem of the spheroidizing timing by spheroidizing the molten iron on the ladle transfer trolley, broaden the selection range of the spheroidizing timing, can avoid some unnecessary quality problems caused by improper spheroidizing timing, and can be applied to the centrifugal casting of ductile iron pipes, especially to the centrifugal casting of ductile iron multi-metal composite pipes.

[0028] The molten iron transfer system and transfer method provided by the present invention perform the last step of spheroidizing treatment on the molten iron on the ladle transfer trolley, which is more convenient than spheroidizing operation in the casting mold, the operation timing and time control are more flexible, the spheroidizing is more uniform, and the effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the detailed description of the preferred embodiments below, the solutions and advantages of the present application will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention.

[0030] In the drawings:

[0031] Figure 1 It is a schematic diagram of the composition principle of a molten iron transfer system according to Embodiment 1 of the present invention.

[0032] Figure 2 is Figure 1 a schematic diagram of a specific structure of the ladle transfer trolley in

[0033] (A) figure is the front view;

[0034] (B) figure is the side view.

[0035] Figure 3 is a schematic diagram of the principle of a molten iron transfer method according to Embodiment 1 of the present invention, where:

[0036] (A), (B), and (C) figures are three different action states during the molten iron transfer process.

[0037] Figure 4 is a schematic diagram of the composition principle of a molten iron transfer system according to Embodiment 2 and Embodiment 3 of the present invention.

[0038] Figure 5 is Figure 4 a schematic diagram of the initial working state structure of the ladle transfer trolley in

[0039] Figure 6 is Figure 4 another schematic diagram of the initial working state structure of the ladle transfer trolley in

[0040] The components represented by the reference numerals in the figures are:

[0041] ductile iron molten iron raw material ladle 10;

[0042] ladle transfer trolley 20, moving support 21, spheroidizing agent conveying member 22, support driving assembly 23, lifting driving assembly 24, walking wheel assembly 25, rotating platform 26;

[0043] ladle 30, first pouring pipe 31, first cavity 32, second cavity 33, second pouring pipe 34;

[0044] pouring mold 40. Specific embodiments

[0045] Embodiment 1

[0046] Refer to Figure 1, A molten iron transfer system, including a ladle transfer trolley 20 running between the casting liquid distribution station and the pouring station. The casting liquid distribution station has a ductile iron molten iron raw material ladle 10, and the pouring station has a pouring mold 40. The ladle transfer trolley 20 carries a ladle 30, receives ductile iron molten iron raw material at the casting liquid distribution station, transports the ladle 30 to the pouring station and controls the ladle 30 to pour the ductile iron molten iron raw material into the pouring mold 40.

[0047] In this embodiment, the pouring mold 40 is a centrifugal casting pipe mold, having a pouring port facing the ladle 30.

[0048] See Figure 2 , On the ladle transfer trolley 20, a moving support 21 and a spheroidizing agent conveying member 22 are provided. The spheroidizing agent conveying member 22 is installed on the moving support 21 and approaches or moves away from the ladle 30 through the moving support 21. During the process of the ladle transfer trolley 20 transporting the ladle 30, or, during the time from when the ladle transfer trolley 20 transports the ladle 30 to the pouring station until before starting to pour the ductile iron molten iron raw material, through the movement and conveying operations of the moving support 21 and the spheroidizing agent conveying member 22, the ductile iron molten iron raw material in the ladle 30 is spheroidized.

[0049] In this embodiment, breakthroughs are sought from the link of molten iron transfer. By spheroidizing the molten iron on the ladle transfer trolley 20, the control problem of the spheroidizing timing is solved. The spheroidizing timing is broadened to the process of the ladle transfer trolley 20 transporting the ladle 30, or, during the time from when the ladle transfer trolley 20 transports the ladle 30 to the pouring station until before starting to pour the ductile iron molten iron raw material, which can avoid some unnecessary quality problems caused by improper spheroidizing timing.

[0050] Continue to see Figure 2 , As an example, the moving support 21 in this embodiment is a column-beam type support that can move in the front-back direction of the ladle transfer trolley 20, and the spheroidizing agent conveying member 22 is a spheroidizing container that can move in the up-down direction along the column-beam type support.

[0051] More specifically, the above column-beam type support may include two columns slidably arranged on both sides of the ladle transfer trolley 20 and a cross beam supported by the two columns. Under the cross beam, a lifting drive assembly 24 such as a push-pull cylinder drives the spheroidizing agent conveying member 22 to move up and down through an intermediate slider or directly connects the spheroidizing agent conveying member 22.

[0052] Two columns can be installed on both sides of the ladle transfer trolley 20 through slide rails, and driven by any support drive assembly 23 to move the two columns back and forth on the slide rails. Any support drive assembly 23 is, for example, a motor-driven gear-rack transmission pair. The rack can be fixed on the side of the ladle transfer trolley 20, and the motor and the drive gear can be fixed on the column, as Figure 2 shown.

[0053] With the above structure, only need to start the motor of the support drive assembly 23 to slide the moving support 21 forward to the front of the ladle transfer trolley 20. After sliding above the ladle 20, then use the lifting drive assembly 24 to push the spheroidizing agent conveying member 22 downward to immerse it into the ladle 20, and then the spheroidizing of the ductile iron molten iron raw material can start.

[0054] Although the spheroidizing agent conveying member 22 in the present invention does not exclude devices similar to those for feeding wire (spheroidizing cored wire) into the molten iron ladle, it is preferably a spheroidizing container that can move up and down along the column-beam type support, especially the spheroidizing container disclosed in the Chinese utility model patents with the authorization announcement numbers CN214193326U or CN214161377U by the present applicant. Such spheroidizing containers have swirling ports with bent channels provided on the peripheral wall and / or bottom wall of the spheroidizing container, and have a self-stirring effect, which can greatly improve the spheroidizing efficiency of the molten iron in the ladle 20.

[0055] It can be seen that by performing the last step of spheroidizing the molten iron on the ladle transfer trolley 20 provided above, it is more convenient than spheroidizing operation in the casting mold 40, the operation timing and time control are more flexible, the spheroidizing is more uniform, and the effect is better.

[0056] The following further elaborates the molten iron transfer method using the molten iron transfer system of the present invention in combination with Figure 3 In the example of Figures 1 to 3 the ladles 30 are all single-chamber ladles, and the lower part thereof has a first pouring tube 31 that can be aligned with the pouring port of the casting mold 40.

[0057] Specifically, the molten iron transfer method using the molten iron transfer system of this embodiment includes the steps:

[0058] S1, the ladle transfer trolley 20 carries the ladle 30, receives the ductile iron molten iron raw material distributed by the ductile iron molten iron raw material package 10 at the molten metal distribution station and transfers it to the pouring station.

[0059] S2, referring to Figure 3, during the process of the pouring ladle transfer trolley 20 transferring the pouring ladle 30, or, after the pouring ladle transfer trolley 20 transfers the pouring ladle 30 to the pouring station and before starting to pour the nodular cast iron molten iron raw material, the moving support 21 moves forward ( Figure 3 in the direction shown in Figure (A)) to send the spheroidizing agent conveying member 22 above the pouring ladle 30, and the spheroidizing agent is conveyed downward through the spheroidizing agent conveying member 22 ( Figure 3 in the direction shown in Figure (B)) to spheroidize the nodular cast iron molten iron raw material in the pouring ladle 30.

[0060] S3, when the pouring time is reached, the pouring ladle transfer trolley 20 controls the pouring ladle 30 so that its first pouring pipe 31 first runs towards the pouring port of the pouring mold 40 ( Figure 3 in the direction shown in Figure (C)), and the nodular cast iron molten iron raw material is poured into the pouring mold 40 through the pouring port of the pouring mold 40. The nodular cast iron molten iron raw material fills the cavity under the action of centrifugal force and is cooled and solidified to obtain nodular cast iron castings.

[0061] The nodular cast iron castings obtained in this embodiment are nodular cast iron single-layer pipes.

[0062] Embodiment 2

[0063] The molten iron transfer system and transfer method of Embodiment 1 are application examples in the manufacture of nodular cast iron single-layer pipes. As mentioned above, the molten iron transfer system and transfer method of the present invention are particularly suitable for controlling the spheroidizing timing of nodular cast iron molten iron raw materials in the manufacture of nodular cast iron multi-metal composite pipes.

[0064] First, as Figure 4 shown, the pouring ladle 30 used in the manufacture of nodular cast iron multi-metal composite pipes in this embodiment is a multi-cavity pouring ladle, and its lower position has a first pouring pipe 31 and a second pouring pipe 34 that can be aligned with the pouring port of the pouring mold 40 by adjusting the direction. Combining Figure 5 it can be seen that the above-mentioned adjustment of the direction is achieved by rotating the pouring ladle 30 by a certain angle on the rotating platform 26 of the pouring ladle transfer trolley 20.

[0065] There are two production situations in the manufacture of nodular cast iron composite layer castings. One is to manufacture composite layer castings with an outer layer of nodular cast iron material, and the other is to manufacture composite layer castings with an inner layer of nodular cast iron material.

[0066] The "castings" referred to in this embodiment all refer to pipe fittings.

[0067] This embodiment first takes the manufacture of composite layer castings with an outer layer of nodular cast iron material as an example to elaborate the molten iron transfer method in this production situation. Specifically, it includes the steps:

[0068] S1. The ladle transfer trolley 20 carries the ladle 30. At the molten metal distribution station, the first cavity 32 of the ladle 30 receives the ductile iron molten metal raw material distributed by the ductile iron molten metal raw material package 10, and the second cavity 33 of the ladle 30 receives the composite layer metal raw material distributed by the composite layer metal raw material package 50 and then transfers it to the pouring station.

[0069] After the ladle 30 on the ladle transfer trolley 20 receives the pouring raw materials in step S1, the initial working state of the ladle 30 is mainly the orientation state, which can be referred to Figure 5 .

[0070] S2. During the process of the ladle transfer trolley 20 transferring the ladle 30, or after the ladle transfer trolley 20 transfers the ladle 30 to the pouring station and before starting to pour the ductile iron molten metal raw material, the moving support 21 moves forward to send the spheroidizing agent delivery member 22 above the first cavity 32 of the ladle 30, and the spheroidizing agent is delivered downward through the spheroidizing agent delivery member 22 to spheroidize the ductile iron molten metal raw material in the first cavity 32 of the ladle 30.

[0071] S3. When it reaches the pouring time of the ductile iron molten metal raw material, the ladle transfer trolley 20 controls the ladle 30 so that the first pouring pipe 31 of the first cavity 32 pours the ductile iron molten metal raw material into the pouring mold 40 through the pouring port of the pouring mold 40. The ductile iron molten metal raw material fills the cavity under the action of centrifugal force and starts the cooling and solidification process.

[0072] S4. When it reaches the pouring time of the composite layer metal raw material, the ladle transfer trolley 20 controls the ladle 30 whose direction has been adjusted by the rotary table 26 so that the second pouring pipe 34 of its second cavity 33 pours the composite layer metal raw material into the pouring mold 40 through the pouring port of the pouring mold 40. The composite layer metal raw material is compounded onto the already formed ductile iron inner layer under the action of centrifugal force, and after cooling and solidification, a composite layer casting with a ductile iron material on the outer layer is obtained.

[0073] In the above molten metal transfer method, for the convenience of operation, before the ladle 30 adjusts its direction on the rotary table 26, the moving support 21 can be moved backward with the spheroidizing agent delivery member 22 to the original position. Of course, in the present invention, the distance between the two columns of the moving support 21 can also be completely wider than the longest part of the ladle 30 (the straight part formed by the two pouring pipes), thereby increasing the freedom of movement of both the moving support 21 and the rotary table 26.

[0074] Example 3

[0075] This embodiment is based on Embodiment 2. Taking the production of a composite layer casting with a ductile iron material inner layer as an example, the molten iron transfer method in this production situation is described. Specifically, it includes the following steps:

[0076] S1. The pouring ladle transfer trolley 20 carries the pouring ladle 30. At the molten metal distribution station, the first cavity 32 of the pouring ladle 30 receives the ductile iron molten metal raw material distributed by the ductile iron molten metal raw material package 10, and the second cavity 33 of the pouring ladle 30 receives the composite layer metal raw material distributed by the composite layer metal raw material package 50 and transfers it to the pouring station.

[0077] After step S1 receives the pouring raw materials, the initial working state of the pouring ladle 30 on the pouring ladle transfer trolley 20 is mainly the direction state, which can be referred to Figure 6 .

[0078] S2. During the process of the pouring ladle transfer trolley (20) transferring the pouring ladle (30), or after the pouring ladle transfer trolley 20 transfers the pouring ladle 30 to the pouring station and before starting to pour the composite layer metal raw material, or after the pouring ladle transfer trolley 20 starts to control the pouring ladle 30 to make the second pouring pipe 34 of the second cavity 33 pour the composite layer metal raw material into the pouring mold 40 until before starting to pour the ductile iron molten metal raw material, the spheroidizing agent conveying member 22 is sent above the first cavity 32 of the pouring ladle 30 by moving the moving support 21 forward, and the spheroidizing agent is conveyed downward through the spheroidizing agent conveying member 22 to spheroidize the ductile iron molten metal raw material in the first cavity 32 of the pouring ladle 30.

[0079] S3. When it reaches the pouring time of the ductile iron molten metal raw material, the pouring ladle transfer trolley 20 controls the pouring ladle 30 whose direction has been adjusted by the rotating carrier 26 so that the first pouring pipe 31 of its first cavity 32 pours the ductile iron molten metal raw material into the pouring mold 40 through the pouring port of the pouring mold 40. The ductile iron molten metal raw material is compounded to the already formed composite layer metal inner layer under the action of centrifugal force, and after cooling and solidification, a composite layer casting with a ductile iron material inner layer is obtained.

[0080] For the action sequence and degrees of freedom of the moving support 21 and the rotating carrier 26, reference can still be made to the description in Embodiment 2, and details will not be elaborated here.

[0081] It can be seen from this embodiment that if the composite layer metal of the outer layer is poured first, by using the molten iron transfer system and transfer method of the present invention, the last step of spheroidizing the ductile iron molten metal raw material can be postponed until after the composite layer metal raw material has been poured into the pouring mold 40, which greatly broadens the spheroidizing timing and provides more sufficient time conditions for the control of the pouring process.

[0082] It is easily understood that the "composite layer metal" mentioned in the embodiments of the present invention refers to the metal composite with ductile cast iron. Generally, there is no particular limitation except that it is different from ductile cast iron. As long as it is a metal that can be used in industry and can be composite with ductile cast iron, preferably but not limited to various corrosion-resistant alloys such as stainless steel, nickel-based alloys, etc.

Claims

1. A hot metal transfer method using a hot metal transfer system, which is applied to the manufacture of composite layer castings with a nodular cast iron material on the outer layer. The hot metal transfer system includes a ladle transfer trolley (20) running between a molten metal distribution station and a pouring station. The molten metal distribution station has a nodular cast iron hot metal raw material ladle (10), and the pouring station has a pouring mold (40). The ladle transfer trolley (20) carries a ladle (30), receives nodular cast iron hot metal raw materials at the molten metal distribution station, transports the ladle (30) to the pouring station and controls the ladle (30) to pour the nodular cast iron hot metal raw materials into the pouring mold (40). A moving support (21) and a spheroidizing agent conveyor (22) are provided on the ladle transfer trolley (20). The spheroidizing agent conveyor (22) is installed on the moving support (21) and approaches or moves away from the ladle (30) through the moving support (21). During the process of the ladle transfer trolley (20) transporting the ladle (30), or, during the time after the ladle transfer trolley (20) transports the ladle (30) to the pouring station and before starting to pour the nodular cast iron hot metal raw materials, the nodular cast iron hot metal raw materials in the ladle (30) are spheroidized through the movement and conveying operations of the moving support (21) and the spheroidizing agent conveyor (22). The moving support (21) is a column-beam type support that can move in the front-rear direction of the ladle transfer trolley (20), and the spheroidizing agent conveyor (22) is a spheroidizing container that can move in the up-down direction along the column-beam type support. The pouring mold (40) is a centrifugal casting pipe mold and has a pouring port facing the ladle (30). The ladle (30) is a multi-chamber ladle, and at its lower position, there are a first pouring pipe (31) and a second pouring pipe (34) that can be aligned with the pouring port of the pouring mold (40) by adjusting the direction. The adjustment of the direction is achieved by rotating the ladle (30) by a certain angle on the rotary table (26) of the ladle transfer trolley (20). It is characterized in that It includes the steps of: S1, the ladle transfer trolley (20) carries the ladle (30), receives the nodular cast iron hot metal raw materials distributed by the nodular cast iron hot metal raw material ladle (10) in the first cavity (32) of the ladle (30) and the composite layer metal raw materials distributed by the composite layer metal raw material ladle (50) in the second cavity (33) of the ladle (30) at the molten metal distribution station and transports them to the pouring station; S2. During the process of the ladle transfer trolley (20) transferring the ladle (30), or after the ladle transfer trolley (20) transfers the ladle (30) to the pouring station and before starting to pour the nodular cast iron molten iron raw material, the spheroidizing agent conveyor (22) is sent above the first cavity (32) of the ladle (30) by moving forward the moving support (21), and the spheroidizing agent is conveyed downward through the spheroidizing agent conveyor (22) to spheroidize the nodular cast iron molten iron raw material in the first cavity (32) of the ladle (30). S3. When it reaches the pouring time of the nodular cast iron molten iron raw material, the ladle transfer trolley (20) controls the ladle (30) to pour the nodular cast iron molten iron raw material into the casting mold (40) through the first pouring pipe (31) of the first cavity (32) through the pouring port of the casting mold (40). The nodular cast iron molten iron raw material fills the cavity under the action of centrifugal force and starts the cooling and solidification process. S4. When it reaches the pouring time of the composite layer metal raw material, the ladle transfer trolley (20) controls the ladle (30) whose direction has been adjusted by the rotary table (26) to pour the composite layer metal raw material into the casting mold (40) through the second pouring pipe (34) of the second cavity (33) through the pouring port of the casting mold (40). The composite layer metal raw material is compounded onto the already formed nodular cast iron inner layer under the action of centrifugal force, and after cooling and solidification, a composite layer casting with a nodular cast iron material on the outer layer is obtained.

2. The hot metal transfer method according to claim 1, wherein Before the ladle (30) adjusts its direction on the rotary table (26), the moving support (21) moves the spheroidizing agent conveyor (22) backward to its original position.

3. A hot metal transfer method using a hot metal transfer system, which is applied to the manufacture of a composite layer casting with a nodular cast iron material on the inner layer. The hot metal transfer system includes a pouring ladle transfer trolley (20) running between a molten metal distribution station and a pouring station. The molten metal distribution station has a nodular cast iron hot metal raw material ladle (10), and the pouring station has a pouring mold (40). The pouring ladle transfer trolley (20) carries a pouring ladle (30), receives nodular cast iron hot metal raw materials at the molten metal distribution station, transports the pouring ladle (30) to the pouring station and controls the pouring ladle (30) to pour the nodular cast iron hot metal raw materials into the pouring mold (40). A moving support (21) and a spheroidizing agent conveyor (22) are arranged on the pouring ladle transfer trolley (20). The spheroidizing agent conveyor (22) is installed on the moving support (21) and approaches or moves away from the pouring ladle (30) through the moving support (21). During the process of the pouring ladle transfer trolley (20) transporting the pouring ladle (30), or, during the time after the pouring ladle transfer trolley (20) transports the pouring ladle (30) to the pouring station and before starting to pour the nodular cast iron hot metal raw materials, the nodular cast iron hot metal raw materials in the pouring ladle (30) are spheroidized through the movement and conveying operations of the moving support (21) and the spheroidizing agent conveyor (22). The moving support (21) is a column-beam type support that can move in the front-back direction of the pouring ladle transfer trolley (20), and the spheroidizing agent conveyor (22) is a spheroidizing container that can move in the up-down direction along the column-beam type support. The pouring mold (40) is a centrifugal casting pipe mold and has a pouring port facing the pouring ladle (30). The pouring ladle (30) is a multi-chamber pouring ladle, and its lower position has a first pouring pipe (31) and a second pouring pipe (34) that can be aligned with the pouring port of the pouring mold (40) by adjusting the direction. The adjustment of the direction is achieved by rotating the pouring ladle (30) by a certain angle on the rotating platform (26) of the pouring ladle transfer trolley (20). It is characterized in that Including the steps: S1, the pouring ladle transfer trolley (20) carries the pouring ladle (30), receives the nodular cast iron hot metal raw materials distributed by the nodular cast iron hot metal raw material ladle (10) in the first cavity (32) of the pouring ladle (30) and the composite layer metal raw materials distributed by the composite layer metal raw material ladle (50) in the second cavity (33) of the pouring ladle (30) at the molten metal distribution station and transports them to the pouring station; S2. During the process of the ladle transfer trolley (20) transferring the ladle (30), or after the ladle transfer trolley (20) transfers the ladle (30) to the pouring station and before starting to pour the composite layer metal raw material, or after the ladle transfer trolley (20) starts to control the ladle (30) to pour the composite layer metal raw material from the second pouring pipe (34) of the second cavity (33) into the pouring mold (40) and before starting to pour the ductile iron molten iron raw material, the spheroidizing agent conveyor (22) is sent above the first cavity (32) of the ladle (30) by moving the moving bracket (21) forward, and the spheroidizing agent is conveyed downward through the spheroidizing agent conveyor (22) to spheroidize the ductile iron molten iron raw material in the first cavity (32) of the ladle (30). S3. When it reaches the pouring time of the ductile iron molten iron raw material, the ladle transfer trolley (20) controls the ladle (30) whose direction has been adjusted by the rotary stage (26) so that the first pouring pipe (31) of its first cavity (32) pours the ductile iron molten iron raw material into the pouring mold (40) through the pouring port of the pouring mold (40). The ductile iron molten iron raw material is compounded onto the already formed composite layer metal inner layer under the action of centrifugal force, and after cooling and solidification, a composite layer casting with a ductile iron material inner layer is obtained.

4. The hot metal transfer method according to claim 3, wherein Before the ladle (30) adjusts its direction on the rotary stage (26), the moving bracket (21) moves the spheroidizing agent conveyor (22) backward to its original position.

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