Magnesium alloy electromagnetic heating material pipe

Abstract

The invention provides a magnesium alloy electromagnetic heating material pipe which comprises a material pipe, and the outer portion of the material pipe is coated with a heat preservation layer. An eddy current coil is wound outside the thermal insulation layer; the eddy current coil is provided with a heat-resistant insulating outer layer. An alternating magnetic field is generated through an eddy current coil, molten magnesium alloy flowing through a material pipe induces eddy current heating, active heating is achieved, the problem that temperature reduction and solidification can still be achieved through pure heat insulation is solved, and the problems that in a traditional resistance wire heating mode, on one hand, heating efficiency cannot be guaranteed, and on the other hand, resistance wires are prone to breakage and short in service life are solved. And high temperature in the pipeline is ensured, so that the metal fluid in the pipeline keeps good flowability, and the smoothness of the material pipe is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal processing, and in particular to a magnesium alloy electromagnetic heating material pipe. BACKGROUND

[0002] The main process of magnesium material processing includes smelting and casting, plastic forming and heat treatment. The smelting is usually carried out by a reverberatory furnace or a crucible furnace, and the casting is usually carried out under inert gas protection. The rolling and extrusion processes need precise temperature control to optimize the performance.

[0003] The conveying pipe of the existing magnesium alloy processing equipment generally uses resistance heating, for example, using resistance wire. The resistance heating method may have the following problems: on the one hand, the resistance heating temperature is not enough, and the heating speed is slow, and the thermal efficiency is relatively poor. When the metal fluid in the pipe flows fast, it may not meet the high temperature and heat preservation requirements in the pipe. On the other hand, the resistance wire is relatively easy to break, wear or damage due to material reasons, and the service life is affected. Therefore, the present application proposes a magnesium alloy electromagnetic heating material pipe to at least partially solve the problems in the prior art. SUMMARY

[0004] In view of the above problems, the present application is proposed to provide a magnesium alloy electromagnetic heating material pipe to overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above problems, the present application discloses a magnesium alloy electromagnetic heating material pipe for conveying molten magnesium alloy fluid, comprising: a material pipe, the outer part of which is covered with a heat preservation layer; A vortex coil is arranged outside the heat preservation layer; The vortex coil has a heat-resistant insulating outer layer.

[0006] Optionally, it further comprises a shell; The shell is arranged outside the vortex coil, and the vortex coil does not contact the vortex coil; The shell is provided with a rear air outlet at one end of the first end and a front air outlet at one end of the second end; The material pipe is connected with a butt joint at the first end and provided with a discharge port at the second end.

[0007] Optionally, the shell is further provided with an air inlet in the middle part, and the air inlet is provided with a cooling fan.

[0008] Optionally, the shell is provided with a plurality of cooling holes at the end of the first end.

[0009] Optionally, the shell is composed of at least two segments, and each segment is connected by a flange plate welded thereon.

[0010] Optionally, the material pipe is provided with a detection hole, and a temperature sensor is arranged at the detection hole, and a wire of the temperature sensor extends out of the shell from the position of the heat preservation layer.

[0011] Optionally, the shell is made of a metal material.

[0012] Some embodiments of the present application also disclose a magnesium alloy hot melting device, which comprises a reverberatory furnace and a crucible furnace. An output port of the reverberatory furnace or the crucible furnace is connected with the magnesium alloy electromagnetic heating material pipe.

[0013] Embodiments of the present application have the following advantages: The present application is provided with a heat preservation layer outside the material pipe, a vortex coil is arranged outside the heat preservation layer, and the vortex coil has a heat-resistant insulating outer layer. The vortex coil generates an alternating magnetic field, the molten magnesium alloy flowing through the material pipe generates self-induced eddy current and heats, active heating is realized, the problem that the molten magnesium alloy may be cooled and solidified due to simple heat insulation is solved, the problems that the heating efficiency cannot be guaranteed and the resistance wire is easy to break and has a short service life in the traditional resistance wire heating mode are solved, the temperature in the pipe is ensured to be high, the internal metal fluid is ensured to have good fluidity, and the material pipe is ensured to be smooth. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a basic structure schematic diagram of a magnesium alloy electromagnetic heating material pipe provided by an embodiment of the present application; Figure 2 is a structure schematic diagram of a magnesium alloy electromagnetic heating material pipe provided by an embodiment of the present application and having a shell; Figure 3 is another view structure schematic diagram of a magnesium alloy electromagnetic heating material pipe provided by an embodiment of the present application; Figure 4 is a cross-sectional structure schematic diagram of a magnesium alloy electromagnetic heating material pipe provided by an embodiment of the present application. DETAILED DESCRIPTION

[0015] In order to make the above objectives, characteristics and advantages of the present application more apparent and easy to understand, the present application is further described in detail below with reference to the drawings and specific embodiments.

[0016] In some embodiments of the present application, as Figure 1As shown, a magnesium alloy electromagnetic heating tube for conveying molten magnesium alloy fluid includes: a tube 101, which is externally covered with a heat insulation layer 102; an eddy current coil 103 is wound around the outside of the heat insulation layer 102; the eddy current coil 103 has a heat-resistant insulating outer layer. The first end 104 of the tube 101 is connected to a crucible outlet, and the second end serves as an output port connected to processing equipment. During operation, the eddy current coil 103 is energized. When the molten magnesium alloy fluid flows through the tube 101, the alternating magnetic field generated by the eddy current coil 103 penetrates the molten magnesium alloy fluid. As a conductor, according to Faraday's law of electromagnetic induction, the changing magnetic field induces an electromotive force (voltage) inside the conductor. Since the conductor is a closed loop (even a single piece of metal can be considered as composed of countless microscopic loops), this induced electromotive force drives a closed loop current within the conductor. This current is called an eddy current. The metal material itself has resistance. According to Joule's law, when eddy currents flow inside a metal, electrical energy is converted into heat energy due to the work done against resistance: Q = I 2 * R* t. When unloaded, that is, when no conductor passes through the magnetic field generated by the eddy current coil 103, the coil mainly exhibits a large inductive reactance. At this time, the current flowing through the coil is mainly reactive current, used to establish and maintain the magnetic field. The current value is relatively small (depending on the power supply voltage and the coil inductive reactance), and the I generated by the coil itself... 2 The heat source R is limited, and no external object is being heated. This addresses the problem that simple insulation may still lead to cooling and solidification, as well as the shortcomings of traditional resistance wire heating methods, such as insufficient heating efficiency and the tendency for resistance wires to break and have a short lifespan. It ensures a high temperature within the pipe, maintaining good fluidity of the internal molten metal and ensuring unobstructed flow. Therefore, this application, through the aforementioned structure, can maintain a high temperature when conveying molten magnesium alloy fluid, preventing the molten magnesium alloy from solidifying inside the material pipe 101 and ensuring unobstructed flow within the pipe 101.

[0017] An alternating magnetic field is generated by the eddy current coil 103, causing the molten magnesium alloy flowing through the feed pipe to induce eddy currents and generate heat, thus achieving active heating. This solves the problem that simple insulation may still cause cooling and solidification, ensuring smooth flow through the feed pipe. When the molten magnesium alloy flows in the feed pipe 101, the eddy current coil 103 is energized to generate an alternating magnetic field, inducing eddy currents and generating heat inside the magnesium alloy, replenishing its heat loss, maintaining its molten state, and preventing a decrease in flow rate and adhesion to the pipe wall. The magnesium alloy electromagnetic heating feed pipe of this application, used as a furnace feed pipe, adopts electromagnetic heating technology. Compared with traditional heating wire heating, it has advantages such as higher heating temperature (up to 800℃ or more), longer service life, and less wire breakage, avoiding waste caused by furnace shutdown and production stoppage due to wire breakage; it also results in high pipe temperature, is less prone to blockage, and is easy to clean the pipe opening; due to the high pipe temperature, it is easy to produce thin parts and complex products with large projected areas.

[0018] It should be noted that the heat-resistant insulation outer layer can be PEEK material or PVC (polyvinyl chloride): widely used in wire and cable insulation layer, with corrosion resistance, voltage resistance and low cost characteristics. PE (polyethylene) can also be used: high-frequency insulation performance is good, often used in high-frequency cable and communication cable. Or also can use composite insulation layer, for example, the above-mentioned PVC or PE material combined with ceramic fiber material layer, as the coil insulation layer, ceramic fiber has good high temperature resistance, can work stably at 1260℃ for a long time. The above material pipe 101 can be made of stainless steel material, which can heat the material pipe 101 when the coil is powered on, that is, when the fluid state metal flows into the material pipe 101, the coil simultaneously heats the material pipe 101 and the metal fluid inside it, so that the metal fluid maintains a high temperature, thereby maintaining its fluidity.

[0019] It should also be noted that the high-temperature melt has good initial fluidity and low viscosity, and is more easily entered into small gaps. Higher temperature and superheat provide longer "effective flow time", allowing the melt to flow further and fill thinner areas before solidification. Even after the shear heating caused by high-speed injection, a high base temperature provides greater safety margin to prevent underfilling or cold shut due to rapid local heat dissipation. On the other hand, the high fluidity of the melt can better overcome flow resistance and smoothly fill every corner of complex cavities, reducing problems such as gas trapping, vortex, underfilling and the like caused by insufficient fluidity. The high-temperature melt is not easily solidified in advance when encountering corners or obstacles, and can maintain better continuity to fill complex shapes. In addition, the high-temperature melt has high initial energy, which can resist more heat loss during long-distance flow. It provides the melt with a longer "flow life", so that it still maintains a certain temperature and fluidity when it reaches the far end of the mold, thereby being able to completely fill the entire large-area cavity and avoid end cold shut or short shot defects.

[0020] In some embodiments of the present application, a housing 201 is further included, which is sleeved outside the eddy current coil 103, and has a rear air outlet 202 at one end of the first end 104 and a front air outlet 203 at one end of the second end 105. The material pipe 101 is connected with a docking port 208 at the position of the first end 104 and is provided with a discharge port 207 at the position of the second end 105. On the one hand, the above-mentioned housing 201 provides protection for the internal structure and reduces the influence of the external environment on the eddy current coil 103 and the heat preservation layer 102. The front and rear air outlets form an air circulation channel, which is helpful for heat dissipation and prevents the coil from overheating. On the other hand, the docking port 208 and the discharge port 207 facilitate the connection of the material pipe with the crucible and the processing equipment, thereby improving the installation convenience. For example, in a high-temperature workshop environment, the housing 201 not only isolates the eddy current coil 103 from the external space, but also blocks other objects from magnetically colliding with the eddy current coil 103. Through the front and rear air outlets, the air flow carries away part of the heat, thereby avoiding damage to the coil due to high temperature.

[0021] Further, the housing 201 is further provided with an air inlet in the middle part, and the air inlet is provided with a cooling fan 205. The air inlet and the cooling fan 205 enhance the air circulation inside the housing 201, improve the heat dissipation efficiency, further ensure that the eddy current coil 103 works at an appropriate temperature, and prolong its service life. For example, when the equipment is running for a long time, the temperature of the eddy current coil 103 rises, the cooling fan starts to work, cold air is sucked in from the air inlet, hot air is discharged from the front air outlet and the rear air outlet, and the temperature of the coil is effectively reduced.

[0022] The housing 201 is provided with a plurality of heat dissipation holes 209 at the end of the first end 104. The plurality of heat dissipation holes at the first end of the housing increase the heat dissipation area and the air circulation path, assist heat dissipation, prevent heat accumulation at the end, and improve the overall heat dissipation effect. When the equipment is running, part of the heat is accumulated at the first end of the housing, and the heat dissipation holes enable this part of the heat to be dissipated to the outside more quickly, thereby avoiding the influence of the local high temperature on the performance of the nearby components.

[0023] The housing 201 is composed of at least two segments, and each segment is connected by a flange plate 204 welded thereon. The segmented design of the housing 201 and the connection by the flange plate 204 facilitate the manufacturing, transportation, installation and maintenance of the housing 201. When a segment of the housing is damaged, it can be replaced individually, thereby reducing the maintenance cost. In the installation site, the segmented housing 201 can be transported separately and assembled by the flange plate 204. If one segment of the housing is damaged due to collision, only the segment needs to be replaced, and the entire housing does not need to be replaced.

[0024] The material pipe 101 is provided with a detection hole, and a temperature sensor 206 is arranged at the position of the detection hole. The lead of the temperature sensor 206 extends from the position of the heat preservation layer 102 to the outside of the shell 201. The temperature sensor 206 can monitor the temperature of the molten magnesium alloy in the material pipe 101 in real time, so as to adjust the heating power of the eddy current coil 103 according to the temperature, realize accurate temperature control, and ensure that the magnesium alloy is always in a suitable molten state. When the temperature sensor 206 detects that the temperature of the magnesium alloy in the material pipe is lower than the set value, a feedback signal can be fed back to increase the current of the eddy current coil 103, so as to enhance the heating effect; when the temperature is too high, the current is reduced, so as to avoid energy waste and affect the performance of the magnesium alloy.

[0025] In some embodiments of the present application, the shell 201 is made of metal material. The shell made of metal material has high strength and rigidity, can better protect the internal structure, resist external impact and pressure, and at the same time, the metal shell can play a certain electromagnetic shielding effect, reducing the interference of the magnetic field generated by the eddy current coil on external equipment. When an object accidentally collides with the shell in the workshop, the metal shell 201 can withstand the impact force, protecting the internal eddy current coil 103 and heat preservation layer 102 from being damaged; at the same time, the influence of the coil magnetic field on the nearby precision electronic instruments is reduced.

[0026] In some embodiments of the present application, based on the same concept, a magnesium alloy hot melting device is also disclosed, which comprises a reverberatory furnace and a crucible furnace. The output port of the reverberatory furnace or the crucible furnace is connected to the above-mentioned magnesium alloy electromagnetic heating material pipe. The combination of the magnesium alloy electromagnetic heating material pipe and the reverberatory furnace or the crucible furnace enables the molten magnesium alloy to continuously maintain a molten state after being output from the furnace body, ensures the smoothness of the entire conveying process, and improves the overall working efficiency and reliability of the magnesium alloy hot melting device. For example, after the magnesium alloy is melted by the crucible furnace, it is conveyed to the processing equipment through the connected electromagnetic heating material pipe. During the conveying process, the material pipe is continuously heated to avoid the solidification of the magnesium alloy in the middle of the way, and to ensure that the processing equipment can continuously and stably receive the molten magnesium alloy for processing.

[0027] Each of the embodiments in the present specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0028] Although the preferred embodiments of the embodiments of the present application have been described, those skilled in the art can make other changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0029] Finally, it needs to be pointed out that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying that there is any such actual relationship or order between these entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover non-exclusive inclusions, so that a process, method, article, or terminal device including a list of elements does not only include those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article, or terminal device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article, or terminal device including the element.

[0030] The above has carried on the detailed introduction to the magnesium alloy electromagnetic heating pipe provided by the present application, the principle and implementation mode of the present application are described in this document by applying specific examples, the above example description is only for helping to understand the method of the present application and its core idea; at the same time, for the general technical personnel in the art, according to the idea of the present application, there will be changes in the specific implementation mode and application range, and the above is not understood as the limitation of the present application.

Claims

1. A magnesium alloy electromagnetic heating feed tube for conveying molten magnesium alloy fluid, characterized in that, include: The material pipe (101) is covered with an insulation layer (102). An eddy current coil (103) is wound around the outside of the insulation layer (102); The eddy current coil (103) has a heat-resistant insulating outer layer.

2. The magnesium alloy electromagnetic heating tube according to claim 1, characterized in that, It also includes the outer casing (201); The outer shell (201) is fitted around the outside of the eddy current coil (103), and the eddy current coil (103) is not in contact with the eddy current coil (103); The outer casing (201) has a rear air outlet (202) at one end of the first end (104) and a front air outlet (203) at one end of the second end (105). The feed tube (101) is connected to a connector (208) at the first end (104) and has a discharge port (207) at the second end (105).

3. The magnesium alloy electromagnetic heating tube according to claim 2, characterized in that, The outer casing (201) is also provided with an air inlet in the middle, and a cooling fan (205) is provided at the air inlet position.

4. The magnesium alloy electromagnetic heating tube according to claim 2, characterized in that, The outer casing (201) is located at the end of the first end (104) and is provided with a plurality of heat dissipation holes (209).

5. The magnesium alloy electromagnetic heating tube according to claim 2, characterized in that, The outer casing (201) consists of at least two sections, each connected by a flange (204) welded thereto.

6. The magnesium alloy electromagnetic heating tube according to claim 2, characterized in that, The material tube (101) is provided with a detection hole, and a temperature sensor (206) is provided at the location of the detection hole. The wire of the temperature sensor (206) extends from the location of the insulation layer (102) out of the outer shell (201).

7. The magnesium alloy electromagnetic heating tube according to claim 2, characterized in that, The outer casing (201) is made of metal.

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