Combined heating device of electrode induction melting gas atomization powder making furnace

Abstract

The utility model relates to a combined heating device of an electrode induction melting gas atomization powder making furnace, and belongs to the technical field of metal powder preparation. Comprising a material hanging device (1), a high-frequency induction coil (5), a medium-frequency induction coil (4) and a fixing rod (2), and the medium-frequency induction coil (4) is arranged over the high-frequency induction coil (5); the fixing rod (2) is arranged on the material hanging device (1), the material hanging device (1) can enable the fixing rod (2) to move up and down, the fixing rod (2) is located over the medium-frequency induction coil (4), and the lower end of the fixing rod (2) is connected with the metal rod (3). According to the device, the degree of superheat of falling metal molten drops is increased through twice heating of the medium-frequency induction coil (4) and the high-frequency induction coil (5), and the yield of fine powder is increased. The fixing rod (2) ensures that the single metal rod (3) is melted as much as possible, and the powder collecting rate of the single metal rod (3) is increased. The problems that the heating power of existing equipment is limited, the superheat degree of metal molten drops is difficult to increase, and the equipment transformation cost is high are solved.

Description

Technical Field

[0001] This utility model relates to a combined heating device for an electrode induction melting gas atomization powder making furnace, belonging to the field of metal powder preparation technology. Background Technology

[0002] The electrode induction melting gas atomization pulverizing furnace uses a high-frequency induction copper coil to heat the tip of a metal rod. The molten droplets from the melted metal rod are then sprayed through a spray plate at a flow rate of 500 m³ / h. 3 / h~2000m 3 High-purity argon gas at a rate of 1 / h is repeatedly broken down to form metal droplets, which are then rapidly cooled and spheroidized in the gas flow to form metal powder with a particle size of 5μm to 150μm.

[0003] Currently, the power supply for the powder-making rods in domestic electrode induction melting gas atomization powder-making equipment is a 150-300kHz high-frequency induction heating power supply. This power supply connects to a conical copper high-frequency induction coil, which heats the metal rod within the melting chamber. The tip of the metal rod melts into droplets that fall onto a spray plate at the bottom of the melting chamber. However, as the power of the high-frequency melting power supply increases, the high-frequency induction coil is prone to discharge, potentially leading to coil breakdown and affecting normal production. Because the heating power of the high-frequency power supply is limited, it is difficult to increase the superheat of the molten metal droplets, which is a key factor determining the fine powder yield during gas atomization powder making. Domestic powder-making companies generally try to indirectly increase the superheat of the molten metal droplets before breakup by increasing the nozzle angle to reduce the droplet travel or by using a heater to heat the argon gas. However, this method suffers from problems such as droplet backflow and extensive equipment modifications, and offers limited improvement in fine powder yield. Utility Model Content

[0004] The technical problem to be solved by this invention is that the heating power of existing equipment is limited, the superheat of molten metal droplets is difficult to increase, and the equipment modification cost is high.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a combined heating device for an electrode induction melting gas atomization pulverizing furnace, including a material hanging device and a high-frequency induction coil, and also including a medium-frequency induction coil and a fixing rod. The medium-frequency induction coil is spaced above the high-frequency induction coil. The fixing rod is detachably mounted on the material hanging device, and the material hanging device can move the fixing rod up and down. The fixing rod is located directly above the medium-frequency induction coil, and its lower end can be detachably connected to the upper end of a metal rod.

[0006] In the above structure, the vertical distance between the bottom circle of the intermediate frequency induction coil and the top circle of the high frequency induction coil is 1.5 to 2.5 cm.

[0007] In the above structure, the distance between the bottommost circle of the high-frequency induction coil and the upper surface of the spray disc is 1 to 3 cm.

[0008] In the above structure, the lower end of the fixing rod is a threaded connector, and the upper end of the metal rod is provided with a matching threaded hole. The fixing rod is threadedly connected to the metal rod.

[0009] In the above structure, the length of the fixing rod is greater than the sum of the height of the intermediate frequency induction coil and the distance between the intermediate frequency induction coil and the high frequency induction coil.

[0010] The material hanging device in the above structure is provided with a transversely penetrating rod changing groove, and the top of the fixing rod is detachably installed in the rod changing groove.

[0011] Furthermore, the fixing rod in the above structure is a T-shaped structure, with the large end of the fixing rod placed at the upper end of the rod changing groove and the middle part locked in the rod changing groove.

[0012] In the above structure, the intermediate frequency induction coil introduction section and the high frequency induction coil introduction section are set at 90°.

[0013] The above structure also includes a medium-frequency induction power supply and a high-frequency induction power supply. The medium-frequency induction power supply is located directly behind the melting chamber, has a frequency of 8 to 25 kHz, and is connected to the medium-frequency induction coil. The high-frequency induction power supply is located to the right of the melting chamber, has a frequency of 150 to 230 kHz, and is connected to the high-frequency induction coil.

[0014] In the above structure, the intermediate frequency induction coil is cylindrical with 2 to 10 turns; the high frequency induction coil is conical with 2 to 4 turns.

[0015] The beneficial effects of this invention are as follows: A medium-frequency induction coil is installed in the middle of the melting chamber to preheat the titanium rod, while a conical high-frequency induction coil is located at the bottom of the melting chamber. This double heating increases the superheat of the falling molten metal droplets, thereby improving the fine powder yield. A fixing rod connects the metal rod to the material hanging device; the fixing rod is not heated by the medium-frequency induction coil, ensuring that each metal rod is preheated and melted as much as possible, thus improving the fine powder yield and overall powder collection rate per rod and increasing production efficiency. Furthermore, this device requires only simple modification to existing equipment; a medium-frequency power supply is added directly behind the melting chamber, introduced into the melting chamber through the medium-frequency induction heating coil. The observation room remains directly in front of the melting chamber, the high-frequency heating power supply is on the right, and the rod changing area is on the left, reducing costs. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic representation of the overall structure of this utility model.

[0017] Figure 2 The diagram shown is a partial front view of the structure of this utility model;

[0018] Figure 3The diagram shows the connection between the metal rod and the fixed rod and the tail of the rod.

[0019] In the diagram: 1. Material hanging device; 2. Fixing rod; 3. Metal rod; 4. Medium frequency induction coil; 5. High frequency induction coil; 6. Medium frequency induction power supply; 7. High frequency induction power supply; 8. Rod changing groove; 9. Rod tail. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figures 1 to 3 As shown, this utility model discloses a combined heating device for an electrode induction melting gas atomization powder-making furnace, including a material hanging device 1 and a high-frequency induction coil 5, as well as a medium-frequency induction coil 4 and a fixing rod 2. The medium-frequency induction coil 4 is spaced out and positioned directly above the high-frequency induction coil 5. The fixing rod 2 is detachably mounted on the material hanging device 1, which allows the fixing rod 2 to move up and down. The fixing rod 2 is located directly above the medium-frequency induction coil 4, and its lower end can be detachably connected to the upper end of a metal rod 3. Those skilled in the art will understand that this device adds a set of medium-frequency induction coils 4 above the high-frequency induction coil 5 to preheat the metal rod 3, increasing the superheat during metal droplet breakage and improving the fine powder yield. Specifically, the medium-frequency induction coils 4 are spaced out and positioned directly above the high-frequency induction coil 5. This structural arrangement allows the metal rod 3 to be heated twice, increasing the superheat of the falling metal droplets and improving the fine powder yield. Simultaneously, this facilitates the connection between the metal rod 3 and the material hanging device 1, while ensuring the fine powder yield and collection rate of a single metal rod 3. This device detachably mounts the fixing rod 2 onto the material hanging device 1. The material hanging device 1 allows the fixing rod 2 to move up and down. Since the lower end of the fixing rod 2 is detachably connected to the upper end of the metal rod 3, it can effectively drive the metal rod 3 to move up and down. Simultaneously, this device positions the fixing rod 2 directly above the intermediate frequency induction coil 4, which is spaced above the high frequency induction coil 5. Therefore, the material hanging device 1 can drive the metal rod 3 from bottom to top through the intermediate frequency induction coil 4 for preheating before entering the high frequency induction coil 5 for melting. The fixing rod 2 ensures that the metal rod 3 can be preheated from bottom to top and that the upper end of the metal rod 3 is placed within the high frequency induction coil 5 as much as possible, improving the powder collection rate of a single metal rod 3. The fixing rod 2 is only used for connection; preferably, it is made of a material that will not be heated by the intermediate frequency induction coil 4, such as PEEK plastic or ceramic. In practice, the material hanging device 1 can preferably have a drive mechanism to drive it to move up and down. The drive mechanism is provided with an upper limit and a lower limit. The lower limit can prevent the material hanging device 1 from contacting the intermediate frequency induction coil 4 and avoid impact damage.

[0022] Preferably, in the above structure, the vertical distance between the bottommost circle of the intermediate frequency induction coil 4 and the topmost circle of the high frequency induction coil 5 is 1.5 to 2.5 cm. Those skilled in the art will understand that, in order to achieve two heating cycles for the metal rod 3, this device preferably alternates between the intermediate frequency induction coil 4 and the high frequency induction coil 5, and the vertical distance between the bottommost circle of the intermediate frequency induction coil 4 and the topmost circle of the high frequency induction coil 5 is 1.5 to 2.5 cm.

[0023] In the above structure, the distance between the bottommost circle of the high-frequency induction coil 5 and the upper surface of the spray disc is 1-3 cm. Those skilled in the art will understand that, to ensure powder collection rate, this device preferably has a distance of 1-3 cm between the bottommost circle of the high-frequency induction coil 5 and the upper surface of the spray disc.

[0024] Preferably, in the above structure, the lower end of the fixing rod 2 is a threaded connector, and the upper end of the metal rod 3 is provided with a matching threaded hole, so that the fixing rod 2 and the metal rod 3 are threadedly connected. Those skilled in the art will understand that, to facilitate the detachable connection between the fixing rod 2 and the metal rod 3, this device preferably has a threaded connector at the lower end of the fixing rod 2, and a matching threaded hole at the upper end of the metal rod 3, so that the fixing rod 2 and the metal rod 3 are threadedly connected. It is also preferable to have a threaded connector at the lower end of the metal rod 3 as well. This connection arrangement allows the unmelted tail 9 of the previous rod to be threadedly connected to the lower end of the new metal rod 3, thereby improving the utilization rate of the metal rod 3.

[0025] Preferably, in the above structure, the length of the fixing rod 2 is greater than the sum of the height of the intermediate frequency induction coil 4 and the distance between the intermediate frequency induction coil 4 and the high frequency induction coil 5. Those skilled in the art will understand that this device ensures that each metal rod 3 is preheated from bottom to top and that it melts as much as possible, thereby improving the fine powder yield and collection rate of the individual metal rod 3 and increasing production efficiency. Specifically, the preferred length of the fixing rod 2 is greater than the sum of the height of the intermediate frequency induction coil 4 and the distance between the intermediate frequency induction coil 4 and the high frequency induction coil 5. This structural arrangement allows the material hanging device 1 to drive the fixing rod 2 downwards, ensuring that each metal rod 3 is preheated from bottom to top, and that the upper end of the metal rod 3 can be completely placed within the high frequency induction coil 5, achieving maximum melting of the metal rod 3.

[0026] Preferably, the material hanging device 1 in the above structure is provided with a transversely penetrating rod changing groove 8, and the top of the fixing rod 2 is detachably disposed in the rod changing groove 8. Those skilled in the art will understand that, in order to facilitate the detachable connection between the fixing rod 2 and the material hanging device 1, this device actually provides a transversely penetrating rod changing groove 8 on the material hanging device 1, and detachably disposes the top of the fixing rod 2 in the rod changing groove 8, thereby achieving the connection between the fixing rod 2 and the material hanging device 1, facilitating the fixing of the metal rod 3 at its lower end.

[0027] Preferably, the fixing rod 2 in the above structure is a T-shaped structure, with the larger end of the fixing rod 2 placed on the upper end of the rod changing groove 8 and the middle part locked inside the rod changing groove 8. Those skilled in the art will understand that the structure of the fixing rod 2 is further preferably T-shaped, with the larger end of the fixing rod 2 placed on the upper end of the rod changing groove 8 and the middle part locked inside the rod changing groove 8, facilitating the assembly and disassembly of the fixing rod 2 and the material hanging device 1.

[0028] Preferably, in the above structure, the intermediate frequency induction coil 4 and the high frequency induction coil 5 are arranged at a 90° angle. Those skilled in the art will understand that, for ease of installation, this device preferably has the intermediate frequency induction coil 4 and the high frequency induction coil 5 arranged at a 90° angle.

[0029] Preferably, the above structure further includes a medium-frequency induction power supply 6 and a high-frequency induction power supply 7. The medium-frequency induction power supply 6 is located directly behind the melting chamber, has a frequency of 8–25 kHz, and is connected to the medium-frequency induction coil 4. The high-frequency induction power supply 7 is located to the right of the melting chamber, has a frequency of 150–230 kHz, and is connected to the high-frequency induction coil 5. Those skilled in the art will understand that this device can be manufactured by modifying and upgrading existing equipment. In practice, only one set of medium-frequency induction power supply 6 needs to be added directly behind the melting chamber, introduced into the melting chamber through the medium-frequency induction coil 4; the area directly in front of the melting chamber remains the observation room, the right side is the high-frequency induction power supply 7, and the left side is the rod changing area, facilitating operation. The medium-frequency induction power supply 6 has a frequency of 8–25 kHz and is connected to the medium-frequency induction coil 4; the high-frequency induction power supply 7 has a frequency of 150–230 kHz and is connected to the high-frequency induction coil 5.

[0030] Preferably, in the above structure, the intermediate frequency induction coil 4 has a cylindrical structure with 2 to 10 turns; the high frequency induction coil 5 has a conical structure with 2 to 4 turns. Those skilled in the art will understand that, to ensure powder collection rate, this device preferably uses a cylindrical structure for the intermediate frequency induction coil 4 to facilitate the insertion of the metal rod 3, and preferably has 2 to 10 turns to improve preheating effect; the high frequency induction coil 5 preferably has a conical structure to ensure that the molten droplets at the lower end of the metal rod 3 fall from the middle for easy collection, and preferably has 2 to 4 turns.

[0031] Example

[0032] Before use, install the tail 9 of the previous rod to the bottom of the metal rod 3, install the bottom end of the fixing rod 2 to the top of the metal rod 3, hang the metal rod 3 with the fixing rod 2 in the middle of the rod changing slot 8 of the hanging device 1, and lower the hanging device 1 so that the tip of the assembled metal rod 3 passes through the intermediate frequency induction coil 4 and is level with the bottom of the intermediate frequency induction coil 4; turn on the intermediate frequency induction power supply 6 for heating (ensure that the metal rod 3 entering the high frequency coil 5 is preheated by the intermediate frequency induction coil 4), and then adjust the descent speed of the assembled metal rod 3 to the preset value. Metal rod 3 descends slowly; when the tip of metal rod 3 enters the high-frequency induction coil 5, the high-frequency induction power supply 7 is turned on. As metal rod 3 descends, the tip of metal rod 3 melts into droplets, which enter the atomization chamber and are atomized into metal powder by the high-speed, high-pressure argon gas from the spray plate; as metal rod 3 descends, when the top of metal rod 3 leaves the bottom of the intermediate frequency induction coil 4, the intermediate frequency induction power supply 6 is turned off; when the top of metal rod 3 enters the top of the high-frequency induction coil 5, the high-frequency induction power supply 7 is turned off; the remaining metal rod 3 is raised to the rod changing chamber for rod changing, and the production of the next rod begins.

[0033] Currently, the yield of 0-53μm TC4 powder from a Φ50*900mm titanium rod is approximately 52%. With this device, the yield of 0-53μm TC4 powder can be increased to 60%; the yield from a single metal rod increases from 90% to 94%; and the utilization rate of the titanium rod increases to 100%.

Claims

1. A combined heating device for an electrode induction melting gas atomization powder production furnace, comprising a material hanging device (1) and a high-frequency induction coil (5), characterized in that: It also includes the intermediate frequency induction coil (4) and fixed rod (2), the intermediate frequency induction coil (4) is arranged in the high frequency induction coil (5) directly above the interval; The fixed rod (2) is detachably arranged on the hanging device (1), the hanging device (1) can move the fixed rod (2) up and down, the fixed rod (2) is directly above the intermediate frequency induction coil (4); The lower end of the fixed rod (2) is a threaded connector, the upper end of the metal rod (3) is provided with a matching threaded hole, the fixed rod (2) and the metal rod (3) are screwed, and the lower end of the metal rod (3) is also provided with a threaded connector; The length of the fixed rod (2) is greater than the sum of the height of the intermediate frequency induction coil (4) and the distance between the intermediate frequency induction coil (4) and the high frequency induction coil (5).

2. The combined heating device for an electrode induction melting gas atomizing powder production furnace according to claim 1, characterized in that: The vertical distance between the bottom circle of the intermediate frequency induction coil (4) and the top circle of the high frequency induction coil (5) is 1.5-2.5 cm.

3. The combined heating device for an electrode induction melting gas atomizing powder production furnace according to claim 1, characterized in that: The distance between the bottom circle of the high frequency induction coil (5) and the upper end of the spray disc is 1-3 cm.

4. The combined heating device for an electrode induction melting gas atomizing powder production furnace according to claim 1, characterized in that: The hanging device (1) is provided with a transversely penetrating rod changing slot (8), and the top of the fixed rod (2) is detachably arranged in the rod changing slot (8).

5. The combined heating device for an electrode induction melting gas atomizing powder production furnace according to claim 4, characterized in that: The fixed rod (2) is T-shaped structure, the large end of the fixed rod (2) is arranged on the upper end of the rod changing slot (8), and the middle part is clamped in the rod changing slot (8).

6. The combined heating device for an electrode induction melting gas atomizing powder production furnace according to claim 1, characterized in that: The intermediate frequency induction coil (4) and the high frequency induction coil (5) are arranged at 90°.

7. The combined heating device for an electrode induction melting gas atomizing powder production furnace according to claim 1, characterized in that: It also includes intermediate frequency induction power supply (6) and high frequency induction power supply (7), the intermediate frequency induction power supply (6) is located directly behind the smelting chamber, the frequency is 8-25 KHz, and is connected with the intermediate frequency induction coil (4); The high frequency induction power supply (7) is located on the right side of the smelting chamber, the frequency is 150-230 KHz, and is connected with the high frequency induction coil (5).

8. The combined heating device for an electrode induction melting gas atomizing powder production furnace according to claim 1, characterized in that: The intermediate frequency induction coil (4) is cylindrical structure, and the number of turns is 2-10 turns; The high frequency induction coil (5) is a conical structure, and the number of turns is 2-4 turns.

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