Efficient metal casting smelting equipment based on cooperation of double heating sources

Abstract

The utility model relates to the technical field of metal casting smelting equipment, and discloses efficient metal casting smelting equipment based on cooperation of double heating sources, which comprises a smelting furnace main body, an induction heating coil is arranged in the smelting furnace main body, and a waste gas eduction tube and a feed port are arranged at the top of the smelting furnace main body; the waste gas eduction tube is communicated with the interior of the smelting furnace main body; the heat conduction oil circulating system is arranged on the outer side of the smelting furnace main body in a surrounding manner; the waste heat recovery device is connected with the waste gas eduction tube; the driving motor is arranged at the top of the smelting furnace body, and a stirring shaft is arranged at the output end of the driving motor and extends into the smelting furnace body. Double heating sources of the induction heating coil and the heat conduction oil circulation system work cooperatively, the metal smelting efficiency is improved, the smelting time is shortened, waste gas waste heat is used for preheating raw materials through the waste heat recovery device, the energy utilization efficiency is improved, energy consumption is reduced, waste gas direct heating type preheating is adopted, and the energy consumption is reduced. The heat efficiency is obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal casting smelting equipment technical field, concretely is a kind of efficient metal casting smelting equipment based on double heating source cooperation. BACKGROUND

[0002] Metal casting is widely used in modern industry, from automobile parts to aerospace precision components, its quality and production efficiency directly affect the development of related industries. The smelting of metal casting is a key link in the whole casting process, which converts solid metal raw materials into liquid metal with good fluidity for subsequent casting forming. In the smelting process, parameters such as temperature, composition and impurity content need to be accurately controlled to ensure the quality of the casting.

[0003] At present, common metal smelting methods include induction smelting, resistance smelting, arc smelting, etc. In actual production, traditional smelting equipment faces many challenges. On the one hand, a single heating source cannot meet the complex production needs, resulting in low smelting efficiency and serious energy waste; on the other hand, a large amount of high-temperature exhaust gas generated during smelting is directly discharged, not only causing energy waste, but also polluting the environment. According to statistics, the waste heat utilization rate of traditional smelting equipment is usually less than 30%, and a large amount of heat energy is wasted.

[0004] Chinese patent CN202320856340 discloses a silver casting smelting equipment, which heats the liquid and preheats the raw materials by setting a water tank using the waste heat of the smelting furnace. However, this waste heat recovery method has certain limitations, as it uses the low-temperature waste heat on the surface of the smelting furnace, and a large amount of heat energy in the high-temperature exhaust gas is not effectively recovered and utilized, resulting in low waste heat recovery efficiency. UTILITY MODEL CONTENT

[0005] To solve the above problems, the utility model adopts the following technical solutions.

[0006] An efficient metal casting smelting equipment based on double heating source cooperation, comprising:

[0007] A smelting furnace main body is internally provided with an induction heating coil, and a waste gas outlet pipe and a feed inlet are arranged at the top; the waste gas outlet pipe is in communication with the inside of the smelting furnace main body, and is used for guiding the exhaust gas generated in the smelting process out;

[0008] A heat conduction oil circulation system is arranged around the outside of the smelting furnace main body;

[0009] A waste heat recovery device is connected to the waste gas outlet pipe, and is used for converting the waste heat of the exhaust gas into usable heat energy;

[0010] A driving motor is arranged at the top of the smelting furnace main body, and a stirring shaft is arranged at the output end of the driving motor, and the stirring shaft extends into the smelting furnace main body.

[0011] a controller electrically connected with the induction heating coil, the heat conduction oil circulation system and the driving motor respectively.

[0012] Preferably, the waste heat recovery device comprises a waste gas preheating coil, an electric regulating valve and a waste gas outlet.

[0013] The waste gas preheating coil is coiled inside the raw material preheating zone, with its inlet connected with the waste gas outlet pipe and its outlet connected with the waste gas outlet.

[0014] The electric regulating valve is installed at the inlet of the waste gas outlet pipe or the waste gas preheating coil and electrically connected with the controller, for regulating the waste gas flow.

[0015] The raw material preheating zone is provided with a temperature sensor electrically connected with the controller, which controls the opening of the electric regulating valve according to the temperature data monitored by the temperature sensor, so as to regulate the waste gas flow and the preheating temperature of the raw material preheating zone in real time.

[0016] Preferably, the waste gas preheating coil comprises an expansion section and a contraction section, with the contraction section starting from the inlet and the pipe diameter gradually decreasing, and the pipe diameter gradually increasing after the contraction section until the outlet.

[0017] Preferably, the heat conduction oil pipeline of the heat conduction oil circulation system is spirally wound outside the smelting furnace body, with a heat conduction oil inlet at the upper end and a heat conduction oil outlet at the lower end.

[0018] Preferably, the stirring shaft is of a hollow structure, with a cooling medium channel inside, and the inlet and outlet of the cooling medium channel are connected with an external cooling system.

[0019] Preferably, the smelting furnace body is provided at the bottom with an inclined flow guide plate, and the lower end of the inclined flow guide plate is connected with a rotatable discharge valve, which is electrically connected with the controller.

[0020] Preferably, the controller comprises a temperature sensor, a PID controller and a man-machine interface, with the temperature sensor evenly distributed on the inner wall of the smelting furnace body and the PID controller connected with the temperature sensor.

[0021] Preferably, the smelting furnace body is wrapped with a multi-layer composite heat insulation material, which comprises an inner ceramic fiber layer and an outer vacuum interlayer.

[0022] Compared with the prior art, the utility model has beneficial effects of

[0023] The utility model discloses a double heating source of inductive heating coil and heat conducting oil circulation system works together, improves the efficiency of metal smelting, shortens the smelting time, and the waste heat recovery device uses the waste gas waste heat for raw material preheating, improves the energy utilization efficiency, reduces the energy consumption and through the waste gas direct heating type preheating, and heat efficiency is improved significantly. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall structure of the utility model sectional view;

[0025] Figure 2 It is the main structure of the utility model smelting furnace schematic diagram;

[0026] Figure 3 It is Figure 1 It is the local structure schematic diagram of A place in middle;

[0027] Figure 4 It is Figure 1 It is the local structure schematic diagram of B place in middle;

[0028] Figure 5 It is Figure 2 It is the local structure schematic diagram of C place in middle.

[0029] In the drawing:

[0030] 1, smelting furnace main part;2, inductive heating coil;31, heat conducting oil import;32, heat conducting oil export;33, heat conducting oil pipeline;4, waste heat recovery device;41, waste gas exhaust port;42, waste gas preheating coil pipe;421, import;422, export;43, electric regulating valve;5, stirring shaft;51, cooling medium passage;6, drive motor;7, controller;71, temperature sensor;8, raw material preheating area;82, temperature sensor;9, external cooling system;10, multilayer composite heat insulating material;101, inner layer ceramic fiber layer;102, outer layer vacuum interlayer;12, inclined guide plate;13, rotatable discharge valve;14, feed inlet;15, waste gas lead-out pipe. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiments of the utility model will be described clearly and completely below with the drawings in the embodiments of the utility model;Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the protection scope of the utility model.

[0032] In the description of the utility model, it needs to explain, the term "upper", "lower", "internal", "external" "top / end" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the utility model, it needs to explain, unless otherwise specified and limited, the terms "installation", "provided with", "sleeved / connected", "connection" and so on should be understood broadly, for example, "connection", can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances. Embodiment

[0034] As Figures 1-5 Indicated, the utility model provides a kind of high-efficiency metal casting smelting equipment based on double heating source cooperation, including smelting furnace main body 1, internally provided with induction heating coil 2, for carrying out induction heating to metal raw material.The top is equipped with waste gas export pipe 15 and feed inlet 14, waste gas export pipe 15 is communicated with smelting furnace main body 1 inside, and waste gas generated in smelting process is exported.Feed inlet 14 is used to input metal raw material.

[0035] Heat conducting oil circulation system, it is spirally wound that its heat conducting oil pipeline 33 is arranged on the outside of smelting furnace main body 1.Heat conducting oil pipeline 33 is equipped with heat conducting oil inlet 31 and heat conducting oil outlet 32, and heat conducting oil inlet 31 is located at upper end, and heat conducting oil outlet 32 is located at lower end.Heat conducting oil inlet 31 and heat conducting oil outlet 32 are connected with heat conducting oil heating device respectively, and heat is transferred to smelting furnace main body 1 by the circulation flow of heat conducting oil, to realize auxiliary heating.

[0036] Waste heat recovery device 4 is connected with waste gas export pipe 15, and includes waste gas preheating coil 42, electric regulating valve 43 and waste gas discharge outlet 41.

[0037] The exhaust gas preheating coil 42 is coiled inside the raw material preheating zone 8, with the inlet 421 connected to the exhaust gas outlet pipe 15 and the outlet 422 connected to the exhaust gas outlet 41. The exhaust gas preheating coil 42 is made of high-temperature-resistant alloy material, such as Inconel 600, and has a corrosion-resistant coating on the surface, such as enamel coating. The exhaust gas preheating coil 42 includes a converging section and a diverging section. The converging section starts from the inlet 421 and the pipe diameter gradually decreases. The length of the converging section can be determined according to the overall length of the coil, for example, the length of the converging section can account for 1 / 3-1 / 2 of the overall length of the coil. The converging ratio can be determined according to the initial flow rate of the exhaust gas and the maximum flow rate expected to be achieved, and generally the pipe diameter can be reduced to 1 / 2-2 / 3 of the initial pipe diameter. The diverging section is after the converging section, and the pipe diameter gradually increases to the outlet 422. The length of the diverging section also needs to be designed according to the actual situation, and generally can be similar to the length of the converging section.

[0038] When the exhaust gas enters the part with gradually decreasing diameter, the flow rate of the exhaust gas increases. According to the principle of heat transfer, the faster the flow rate of the fluid, the larger the convective heat transfer coefficient between the fluid and the surrounding object, which is the raw material here. The increase in convective heat transfer coefficient means that more heat is transferred from the exhaust gas to the raw material per unit time, thereby enhancing the heat exchange efficiency.

[0039] When the exhaust gas passes through the converging section and enters the part with gradually increasing diameter, although the flow rate decreases, the pressure increase helps the exhaust gas to better contact and transfer heat with the raw material around the coil, further promoting the transfer of heat from the exhaust gas to the raw material.

[0040] The change in exhaust gas flow rate will form stronger turbulence in the coil. Turbulence can make the flow of exhaust gas in the coil more chaotic, reducing the thickness of the boundary layer. The boundary layer refers to a layer of fluid with low flow rate near the surface of the solid when the fluid contacts the surface of the solid, which hinders heat transfer. After the turbulence is enhanced, the boundary layer becomes thinner, and heat is more easily transferred from the exhaust gas to the coil and then from the coil to the raw material, thereby improving the heat exchange efficiency.

[0041] The electric regulating valve 43 is installed at the inlet of the exhaust gas outlet pipe 15 or the exhaust gas preheating coil 42 and is electrically connected to the control system 7 for regulating the exhaust gas flow rate.

[0042] A temperature sensor 82 is provided in the raw material preheating zone 8 and is electrically connected to the control system 7. The control system 7 controls the opening of the electric regulating valve 43 according to the temperature data monitored by the temperature sensor 82, adjusts the exhaust gas flow rate in real time, and further adjusts the preheating temperature of the raw material preheating zone 8.

[0043] The stirring shaft 5 extends into the smelting furnace body 1 and is connected to the driving motor 6, and is a hollow structure with a cooling medium passage 51 inside, with the inlet and outlet connected to the external cooling system 9. Through the stirring of the stirring shaft 5, the metal raw material is uniformly heated.

[0044] The control system 7 is electrically connected with the induction heating coil 2, the heat conducting oil circulation system, the driving motor 6, the electric regulating valve 43 and the temperature sensors 71 and 82 respectively. The temperature sensors 71 are uniformly distributed on the inner wall of the smelting furnace body 1, and the PID controller adjusts the power output of the induction heating coil 2 and the heat conducting oil circulation system according to the feedback signal of the temperature sensors 71, so as to realize precise control of the smelting temperature.

[0045] The working principle of the above technical solution is as follows:

[0046] In use, the control system 7 is started, and parameters such as smelting temperature and waste gas flow are set; the metal raw materials are put into the smelting furnace body 1 through the electromagnetic vibration feeder 15 at the feeding port 14. During the heating process, the control system 7 starts the induction heating coil 2 and the heat conducting oil circulation system at the same time. The induction heating coil 2 performs induction heating on the metal raw materials, and the heat conducting oil enters the heat conducting oil pipeline 33 from the heat conducting oil inlet 31, flows around the smelting furnace body 1 and transfers heat to the metal raw materials, so as to realize the cooperative work of the double heating sources.

[0047] The high-temperature waste gas generated in the smelting process enters the waste heat recovery device 4 through the waste gas outlet pipe 15. The waste gas enters the waste gas preheating coil 42, which is coiled in the raw material preheating area 8, and preheats the raw materials.

[0048] The temperature sensor 82 in the raw material preheating area 8 monitors the raw material temperature in real time and feeds back the data to the control system 7. The control system 7 adjusts the opening degree of the electric regulating valve 43 according to the preset temperature range, controls the opening degree of the electric regulating valve 43, adjusts the waste gas flow and realizes the control of the raw material preheating temperature.

[0049] During the heating process, the driving motor 6 drives the stirring shaft 5 to rotate, stirs the metal raw materials in the smelting furnace body 1 and makes the raw materials evenly heated. At the same time, the external cooling system 9 introduces cooling medium into the stirring shaft 5 through the cooling medium channel 51, takes away the heat generated in the stirring process and prevents the stirring shaft 5 from being damaged due to high temperature.

[0050] When the smelting is completed, the control system 7 controls the rotatable discharge valve 13 to open. The inclined flow guide plate 12 at the bottom of the smelting furnace body 1 guides the molten metal to flow out smoothly.

[0051] The above is only a preferred specific embodiment of the present application; however, the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme of the present application and the improved concept thereof within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A high-efficiency metal casting melting equipment based on dual heating source synergy, characterized in that, include: The main body of the smelting furnace (1) is equipped with an induction heating coil (2) inside, and a waste gas outlet pipe (15) and a feed inlet (14) are provided on the top; the waste gas outlet pipe (15) is connected to the inside of the main body of the smelting furnace (1) and is used to export the waste gas generated during the smelting process; A heat transfer oil circulation system is arranged around the outside of the main body of the smelting furnace (1); Waste heat recovery device (4), connected to the exhaust gas outlet pipe (15), is used to convert waste heat of exhaust gas into usable thermal energy; A drive motor (6) is located on the top of the main body (1) of the smelting furnace, and a stirring shaft (5) is provided at its output end. The stirring shaft (5) extends into the main body (1) of the smelting furnace. The control system (7) is electrically connected to the induction heating coil (2), the heat transfer oil circulation system and the drive motor (6), respectively.

2. The device according to claim 1, characterized in that, The waste heat recovery device (4) includes a waste gas preheating coil (42), an electric regulating valve (43), and a waste gas outlet (41). The waste gas preheating coil (42) is coiled inside the raw material preheating zone (8), with its inlet (421) connected to the waste gas outlet pipe (15) and its outlet (422) connected to the waste gas discharge outlet (41); the waste gas preheating coil (42) is made of high temperature resistant alloy material and its surface is provided with an anti-corrosion coating. The electric regulating valve (43) is installed at the inlet of the exhaust gas outlet pipe (15) or the exhaust gas preheating coil (42) and is electrically connected to the control system (7) to regulate the exhaust gas flow rate. A temperature sensor (82) is installed in the raw material preheating zone (8). The temperature sensor (82) is electrically connected to the control system (7). The control system (7) controls the opening of the electric regulating valve (43) according to the temperature data monitored by the temperature sensor (82) to adjust the exhaust gas flow in real time, thereby adjusting the preheating temperature of the raw material preheating zone (8).

3. The device according to claim 2, characterized in that, The exhaust gas preheating coil (42) includes an expansion section and a contraction section. The contraction section starts from the inlet (421) and the pipe diameter gradually decreases. After the contraction section, the pipe diameter gradually increases until the outlet (422).

4. The device according to claim 1, characterized in that, The heat transfer oil pipe (33) of the heat transfer oil circulation system is spirally wound around the outside of the smelting furnace body (1). The heat transfer oil pipe (33) is provided with a heat transfer oil inlet (31) and a heat transfer oil outlet (32). The heat transfer oil inlet (31) is located at the upper end of the heat transfer oil pipe (33), and the heat transfer oil outlet (32) is located at the lower end.

5. The device according to claim 1, characterized in that, The stirring shaft (5) is a hollow structure with a cooling medium channel (51) inside. The inlet of the cooling medium channel (51) is connected to the external cooling system (9).

6. The device according to claim 1, characterized in that, The bottom of the main body (1) of the smelting furnace is provided with an inclined guide plate (12), and a rotatable discharge valve (13) is connected below the inclined guide plate (12). The rotatable discharge valve (13) is electrically connected to the control system (7).

7. The device according to claim 1, characterized in that, The control system (7) includes a temperature sensor (71), a PID controller and a human-machine interface. The temperature sensor (71) is evenly distributed on the inner wall of the furnace body (1), and the PID controller is connected to the temperature sensor (71).

8. The device according to claim 1, characterized in that, The main body (1) of the smelting furnace is wrapped with a multi-layer composite heat insulation material (10), which includes an inner ceramic fiber layer (101) and an outer vacuum interlayer (102).

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