Electromagnetic induction filtering device and system for counter-pressure casting riser tube

Abstract

The utility model belongs to the technical field of counter-pressure casting, and particularly relates to a counter-pressure casting riser tube electromagnetic induction filtering device and system, which comprises a middle tube, an induction heating coil, a heating coil embedding block, a filtering medium and a riser tube, the filtering medium is arranged inside the riser tube, and the induction heating coil and the heating coil embedding block are arranged outside the riser tube. And the intermediate pipe covers the induction heating coil embedded block. Through structural optimization of the riser tube, impurities at the bottom of the molten metal container can be prevented from being involved into pure molten metal in the molten metal suction process, and filtering of original impurities is guaranteed to the maximum extent. Through the synergistic effect of electromagnetic induction and the magnetic filtering medium, magnetic and non-magnetic impurities in molten metal can be effectively filtered, the purity of the molten metal is remarkably improved, defects in a casting are reduced, and the mechanical property and reliability of the casting are improved.

Description

Technical Field

[0001] This utility model belongs to the field of differential pressure casting technology, specifically relating to an electromagnetic induction filtration device and system for a differential pressure casting riser pipe. Background Technology

[0002] In differential pressure casting, the riser pipe is a key component that guides molten metal from the furnace into the mold cavity. However, many problems currently exist that affect the quality of the castings.

[0003] On the one hand, various impurities, such as oxides and inclusions, inevitably mix into the molten metal during melting and transfer. These impurities enter the mold cavity with the molten metal, forming defects inside the casting and reducing its mechanical properties and reliability. For example, in the automotive manufacturing industry, even tiny impurities can cause critical components to crack under high stress and high fatigue conditions, leading to serious safety accidents. Traditional filtration methods, such as using simple filters, can only filter larger impurities and are ineffective at filtering tiny impurities, making it difficult to meet the stringent quality requirements of high-end castings. Moreover, each casting requires one to two filters, and the higher the production volume, the greater the cost, impacting the factory's operating costs.

[0004] On the other hand, in casting, the molten metal first undergoes refining, degassing, and settling processes to separate impurities from the pure molten metal and remove the impurities. However, some impurities still remain in the molten metal. During the settling process, due to the density of the metal, they settle to the bottom of the molten metal container. In differential pressure casting, the casting is produced by drawing molten metal from a crucible or holding furnace into the mold cavity via a riser pipe for solidification. After solidification, the remaining molten metal flows back into the crucible or holding furnace. This repeated drawing and reflux continuously stirs the molten metal in the crucible or holding furnace, causing the impurities that originally settled at the bottom to be drawn back into the molten metal, thus increasing the amount of impurities in the molten metal.

[0005] Furthermore, existing riser pipes struggle to precisely control the flow of molten metal during its ascent. Turbulent flow exacerbates impurity contamination and can lead to uneven metal distribution within the mold cavity, impacting casting quality. Moreover, the existing filtration system's connection to the riser pipe is insufficient. During differential pressure casting, pressure changes and molten metal scouring can cause filter screen displacement and damage, hindering its stable filtration function. Additionally, manual filter placement is highly susceptible to errors, ranging from affecting filtration efficiency to causing inclusions in the casting, cracking, failure, and even safety hazards.

[0006] Therefore, developing a high-efficiency and stable differential pressure casting riser electromagnetic induction filtration device is of great practical significance. Utility Model Content

[0007] The utility model provides a kind of differential pressure casting riser electromagnetic induction filter device and system, to solve the problem that the combination of filter system and riser is not safe enough in prior art, compact.

[0008] To achieve the above purpose, the utility model provides technical solutions as follows:

[0009] A kind of differential pressure casting riser electromagnetic induction filter device, including intermediate tube, induction heating coil, heating coil embedding block, filter medium and riser;

[0010] The induction heating coil is arranged at the outer ring of the riser by the heating coil embedding block, the riser is internally provided with filter medium, and the intermediate tube is covered on the induction heating coil embedding block;

[0011] The riser bottom is provided with riser flow hole.

[0012] Preferably, it further includes sealing block, and the induction heating coil is sealed and fixed on the outer ring of the riser by the sealing block.

[0013] Preferably, the filter medium includes coarse filter medium and fine filter medium.

[0014] Preferably, it further includes riser flange, and the heating coil embedding block is fixedly arranged at the outer ring of the riser by the riser flange.

[0015] A kind of differential pressure casting riser electromagnetic induction filter system, including the differential pressure casting riser electromagnetic induction filter device, further including furnace cover plate, furnace plate and crucible;

[0016] The differential pressure casting riser electromagnetic induction filter device is installed on the furnace cover plate, the furnace cover plate is arranged on the furnace plate, and the furnace plate is arranged on the crucible.

[0017] Preferably, it further includes furnace plate sealing block, and the furnace cover plate is sealed and fixed on the furnace plate by the furnace plate sealing block.

[0018] The utility model has the advantages that:

[0019] The utility model provides a kind of differential pressure casting riser electromagnetic induction filter device, including the riser of being provided with riser flow hole, can prevent the impurity at the bottom of metal liquid container from being rolled into pure metal liquid during metal liquid suction process, and the filtration of primary impurity is guaranteed to the maximum extent.Furthermore, through the synergistic effect of electromagnetic induction and magnetic filter medium, magnetic and non-magnetic impurities in metal liquid can be effectively filtered, the purity of metal liquid is significantly improved, the internal defects of casting are reduced, and the mechanical properties and reliability of casting are improved.

[0020] The sealing and fixing assembly ensures that the filtering device can stably operate under the high-temperature and high-pressure environment of the differential pressure casting, avoids displacement and damage of the filtering device, and ensures long-term effectiveness of the filtering system. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying the specification of this utility model form a part of the disclosure of this utility model and serve to provide further understanding of the utility model, and together with the description of the illustrative embodiments of the utility model, serve to explain the utility model, and do not constitute an inappropriate limitation on the utility model. In the drawings:

[0022] Figure 1 It is a differential pressure casting riser electromagnetic induction filtering device schematic diagram;

[0023] Figure 2 It is a riser flow hole schematic diagram;

[0024] Figure 3 It is a differential pressure casting riser electromagnetic induction filtering system schematic diagram. DETAILED DESCRIPTION

[0025] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0026] The following detailed description is exemplary description, which aims at providing further detailed description of the utility model. Unless otherwise specified, all technical terms used in the utility model are the same as the meanings commonly understood by the general technical personnel in the field to which the utility model belongs. The terms used in the utility model are only for describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the utility model.

[0027] Please refer to Figure 1 As shown in the figure, the utility model provides a differential pressure casting riser electromagnetic induction filtering device, which comprises an intermediate pipe 11, an induction heating coil 13, a riser flange 14, a filtering medium, an induction heating coil embedding block 16 and a riser 18.

[0028] The induction heating coil 13 is arranged at the outer ring of the riser 18 through the induction coil embedding block 16 and the riser flange 14, and is sealed and fixed through the sealing block 12.

[0029] The induction heating coil 13 is wrapped around a specific position of the riser 18, is packaged with high-temperature-resistant and high-strength insulating material, and can stably work under the high-temperature and high-pressure environment of the differential pressure casting. When the induction heating coil 13 is electrified, an alternating magnetic field will be generated in the riser 18.

[0030] The filter medium is arranged on the clamping groove inside the riser 18, and is composed of two parts, including a coarse filter medium 17 and a fine filter medium 15. The metal liquid is first coarsely filtered by the medium with a larger mesh, and then finely filtered by the medium with a small mesh diameter. In the process of flowing of the metal liquid, the blocking of the double-layer filter medium breaks the turbulence in the process of the metal liquid flow, so that the metal liquid uniformly passes through the mesh, and the metal liquid has a suitable flow state when entering the mold cavity, which is beneficial to the forming of the casting.

[0031] The filter medium is selected from a magnetic material with high magnetic permeability and good filtering performance, such as a high-temperature-resistant alloy or a special formula iron-based alloy sintered felt. Under the action of the alternating magnetic field, the filter medium is magnetized, and has a strong adsorption force on the magnetic impurities in the metal liquid, so that the magnetic impurities are captured and filtered out. At the same time, due to the electromagnetic induction caused by the alternating magnetic field, the metal liquid around the non-magnetic impurities generates a micro-eddy current, and the resistance generated by the micro-eddy current slows down the movement speed of the impurities, so that the impurities are more easily intercepted by the filter medium.

[0032] Through the synergistic effect of electromagnetic induction and the magnetic filter medium, the magnetic and non-magnetic impurities in the metal liquid can be effectively filtered, the purity of the metal liquid is significantly improved, the internal defects of the casting are reduced, and the mechanical properties and reliability of the casting are improved. The double-layer filter medium can change the flow state of the metal liquid in the riser 18, reduce turbulence, and make the metal liquid more uniformly distributed when entering the mold cavity, which is beneficial to the forming of the casting and improves the dimensional accuracy and surface quality of the casting.

[0033] The filter medium does not come out with the casting, and is always embedded in the riser 18. After the casting is completely solidified, the induction heating coil 13 is powered on, so that the filter medium reaches a high temperature of thousands of degrees in a few seconds, the connection point between the casting and the filter medium is melted, the metal in the semi-solid state is melted into the metal liquid, the filtering function of the filter medium is restored, and preparation is made for the next cycle.

[0034] The intermediate pipe 11 covers the induction heating coil embedding block 16; and the bottom of the riser 18 is provided with a riser flow hole 19, as shown in Figure 2 Through the structural optimization of the riser 18, the impurities at the bottom of the metal liquid container can be prevented from being rolled into the pure metal liquid in the metal liquid suction process, and the filtering of the primary impurities is maximized.

[0035] The utility model also provides a kind of differential pressure casting riser electromagnetic induction filtering system, as shown in Figure 3 The system includes the differential pressure casting riser electromagnetic induction filtering device, furnace cover plate 21, furnace plate 22, furnace plate sealing block 23 and crucible 24.

[0036] The differential pressure casting riser electromagnetic induction filtering device is arranged on the furnace cover plate 21 and is sealed and fixed on the furnace plate 22 through the furnace plate sealing block 23, and the furnace plate 22 is arranged on the crucible 24. The sealing ensures that the filtering system can stably operate in the high-temperature and high-pressure environment of differential pressure casting, avoids displacement and damage of the filtering device, and guarantees long-term effectiveness of the filtering system. Embodiment

[0037] The installation process of the differential pressure casting riser electromagnetic induction filtering system is specifically as follows:

[0038] First, the induction heating coil 13 and the induction coil embedding block 16 are assembled and placed at a specified position of the outer circle of the riser 18, so as to ensure that the electromagnetic coil is tightly and neatly installed.

[0039] Then, the coarse filter medium 17 and the fine filter medium 15 are installed on the clamping groove inside the riser, so as to ensure that the filter media are evenly distributed without gaps.

[0040] Next, the intermediate pipe 11 is installed and covers the induction heating coil embedding block 16.

[0041] Then, the differential pressure casting riser electromagnetic induction filtering device is installed on the furnace cover plate 21 and assembled on the furnace plate 22.

[0042] The induction heating coil and the filtering system are sealed and fixed by using the sealing block 12 and the furnace plate sealing block 23, and the installation of the entire filtering system is completed. Embodiment

[0043] The operation process of the differential pressure casting riser electromagnetic induction filtering system is specifically as follows:

[0044] When the differential pressure casting starts, the molten metal in the furnace rises through the riser 18 under the action of differential pressure, at this time, the induction heating coil 13 is powered on to generate an alternating magnetic field, and the filter medium adsorbs and filters the impurities in the molten metal under the action of the magnetic field.

[0045] In the process that the molten metal passes through the riser 18 and enters the mold cavity, the filtering system continuously works, so as to ensure that the molten metal entering the mold cavity is high in purity and good in flow state, thereby guaranteeing the quality of the casting.

[0046] After the filling process is completed, the differential pressure casting riser electromagnetic induction filtering device is powered off, and the casting enters the solidification stage.

[0047] After the casting is completely solidified, the induction heating coil is powered on again, the connection point between the casting and the differential pressure casting riser electromagnetic induction filtering device is fused, and the filtering capacity of the filter medium is restored.

[0048] After the differential pressure casting is completed, the system is maintained and cleaned, specifically as follows:

[0049] Turn off the power supply of the electromagnetic induction filter device of the differential pressure casting riser, and wait for the riser 18 to cool down.

[0050] Dismount the intermediate pipe 11, the sealing block 12 and the furnace plate sealing block 23, and take down the differential pressure casting riser electromagnetic induction filter device from the riser 18.

[0051] Clean the impurities adsorbed on the filter medium, which can be physically cleaned by using a cleaning shovel or chemically cleaned by soaking in a special cleaning agent.

[0052] Check whether the riser flow hole 19 is damaged, and replace the riser 18 in time if it is damaged.

[0053] After cleaning and checking, reinstall the filter system to prepare for the next differential pressure casting.

[0054] In the application of the utility model, the metal liquid suction device is limited by the lowest working liquid level, and lateral flow holes are arranged, the angles of which are upward and uniformly distributed, and the total sectional area is greater than the pipe opening area of the original riser 18, which is used for sharing the original pipe opening metal liquid flow amount of the riser 18, slowing down the problem of increasing impurities after the metal liquid is stirred, and making the metal liquid flow and suck in the pure part.

[0055] In order to ensure the stability and sealing performance of the filter system in the differential pressure casting process, a special sealing and fixing assembly is designed. At the connection between the electromagnetic induction filter device and the riser flange, the sealing block 12 resistant to high temperature and high pressure is used for sealing to prevent the leakage of metal liquid and pressure. At the same time, it can withstand the changes of temperature and size after being washed by the metal liquid, and ensure that the filter device will not be displaced or loose. The sealing and heat preservation structure is also arranged at the connection part of the riser and the mold cavity to prevent the leakage of metal liquid when entering the mold cavity and affect the quality of the casting.

[0056] From the technical knowledge, the utility model can be realized through other embodiments without departing from the spirit or essential characteristics thereof. Therefore, the above disclosed embodiments are only examples and are not the only ones. All changes within the scope of the utility model or within the scope equivalent to the utility model are included in the utility model.

[0057] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model and not to limit them, although the utility model has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the utility model can still be modified or replaced, and any modification or equivalent replacement without departing from the spirit and scope of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A differential pressure casting riser electromagnetic induction filtering device, characterized by, The intermediate tube, the induction heating coil, the heating coil embedding block, the filter medium and the riser tube are included. The induction heating coil is arranged on the outer ring of the riser tube through the heating coil embedding block, the filter medium is arranged inside the riser tube, and the intermediate tube covers the induction heating coil embedding block. The riser tube flow hole is arranged at the bottom of the riser tube.

2. A differential pressure casting riser electromagnetic induction filtering device according to claim 1, characterized in that, The induction heating coil is sealed and fixed on the outer ring of the riser tube through the sealing block.

3. A differential pressure casting riser electromagnetic induction filtering device according to claim 1, characterized in that, The filter medium includes coarse filter medium and fine filter medium.

4. A differential pressure casting riser electromagnetic induction filtering device according to claim 1, characterized in that, The heating coil embedding block is fixedly arranged on the outer ring of the riser tube through the riser tube flange.

5. A differential pressure casting riser electromagnetic induction filtration system, characterized by, The differential pressure casting riser tube electromagnetic induction filtering device as claimed in any one of claims 1-4 is included, and a furnace cover plate, a furnace plate and a crucible are further included. The differential pressure casting riser tube electromagnetic induction filtering device is mounted on the furnace cover plate, the furnace cover plate is arranged on the furnace plate, and the furnace plate is arranged on the crucible.

6. A differential pressure casting riser electromagnetic induction filtration system as claimed in claim 5, wherein, The furnace cover plate is sealed and fixed on the furnace plate through the furnace plate sealing block.

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