A medium frequency induction furnace for alloy powder production

Abstract

The invention discloses a medium-frequency induction electric furnace for producing alloy powder, wherein a furnace cover is arranged on the top of the furnace body, a crucible is arranged inside the furnace body, a magnetic yoke is fixedly arranged inside the furnace body, a main induction coil is arranged inside the magnetic yoke, the induction coil is arranged outside the crucible, a discharge pipe is arranged at the bottom end of the furnace body, the top end of the discharge pipe is connected to the inside of the crucible, and the bottom end of the discharge pipe is detachably connected with a discharge control device, the discharge control device comprises a rotatable inner sleeve arranged inside the discharge pipe, the outer wall of the inner sleeve is tightly connected to the inner wall of the discharge pipe, the bottom end of the inner sleeve is closed, a first discharge port is opened on the side wall of the inner sleeve, a second discharge port is arranged on the side wall of the discharge pipe, a discharge branch pipe is connected to the second discharge port, a rotating shaft is connected to the bottom end of the inner sleeve, a supporting base and a rotating drive device are connected to the bottom end of the rotating shaft, and the supporting base and the discharge pipe are fixedly connected by a connecting flange; the invention has the advantages of not easy to leak, safety and reliability, and convenient and labor-saving operation.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy powder production, and in particular relates to a medium frequency induction furnace for alloy powder production. Background Art

[0002] Alloy powder is a metal powder formed by partial or complete alloying of two or more components. Alloy powders are mainly classified according to their composition into ferroalloy powder, copper alloy powder, nickel alloy powder, cobalt alloy powder, aluminum alloy powder, titanium alloy powder and precious metal alloy powder.

[0003] When preparing alloy powder, a medium frequency induction furnace is needed to melt raw materials such as iron blocks and nickel blocks into liquid metal before preparing alloy powder. Medium frequency induction furnaces in the prior art mostly adopt the top discharging method when in use, and the discharging is carried out by tipping the furnace body. The furnace body is relatively heavy and it is very inconvenient to operate. At the same time, frequent tipping of the furnace body is also likely to affect the stability of the furnace body. Therefore, in the prior art, there is a method of discharging from the bottom of the furnace body for unloading, and a plug rod is used to distribute the bottom discharge port to control the bottom discharge. This method is prone to the situation that liquid metal cannot stop the leakage, and the plug rod extends from the top of the furnace body into the furnace body. The travel is long and it is easy to break, which increases the labor intensity of the staff and poses a safety hazard.

[0004] Therefore, in order to solve the above problems, it is necessary to develop a medium frequency induction furnace for alloy powder production. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a medium frequency induction furnace for alloy powder production. A discharge control device is provided at the discharge port at the bottom of the furnace body. Unloading is achieved by rotating the inner sleeve in the discharge control device. It is not easy to leak, the operation is convenient and labor-saving, and the safety is higher.

[0006] The objective of the present invention is achieved as follows: A medium-frequency induction furnace for alloy powder production comprises a furnace body, a furnace cover, a crucible, a yoke, a main induction coil, a discharge pipe and a discharge control device, wherein a furnace cover is arranged at the top of the furnace body, a crucible is arranged inside the furnace body, a yoke is fixedly arranged inside the furnace body, a main induction coil is arranged on the inner side of the yoke, the induction coil is arranged on the outer side of the crucible, a discharge pipe is arranged at the bottom end of the furnace body, the top end of the discharge pipe is connected to the inside of the crucible, the bottom end of the discharge pipe extends out of the furnace body and is detachably connected to the discharge control device, the discharge control device comprises a rotatable inner sleeve arranged inside the discharge pipe, the outer side wall of the inner sleeve is tightly connected to the inner side wall of the discharge pipe, the bottom end of the inner sleeve is closed, the side wall of the inner sleeve is provided with a first discharge port, and the discharge pipe The side wall is provided with a second discharge port fixed in a position corresponding to the first discharge port, and the second discharge port is connected to a discharge branch pipe. When the first discharge port follows the inner sleeve to rotate to a working position connected to the second discharge port, the discharge branch pipe is connected to the inside of the discharge pipe for discharging material. The first discharge port follows the inner sleeve to rotate to a closed position misaligned with the second discharge port, and the discharge branch pipe and the discharge pipe are in a closed state and do not discharge material. The bottom end of the inner sleeve is connected to a rotating shaft, and the bottom end of the rotating shaft extends out of the discharge pipe and is connected to a supporting base with a concave cross-section. The bottom of the discharge pipe is inserted into the supporting base, and the bottom end of the rotating shaft passes through the bottom plate of the supporting base through a rotating bearing and is connected to a rotating driving device. The support base and the outer side wall of the discharge pipe are fixedly connected by a connecting flange.

[0007] Furthermore, a sealing ring is provided between the furnace body and the furnace cover, and an air hole is provided on the furnace cover.

[0008] Furthermore, heat insulation plates are respectively arranged at the top and bottom of the crucible in the furnace body.

[0009] Furthermore, a gas-permeable brick communicating with the interior of the crucible is also provided at the bottom of the furnace body, and the gas-permeable brick is connected to a nitrogen blowing device.

[0010] Furthermore, an auxiliary induction coil is mounted on the outer side of the discharge pipe.

[0011] Furthermore, the discharge branch pipe is arranged to be inclined downward, and the inner bottom surface of the crucible is arranged to be inclined toward the discharge pipe.

[0012] Furthermore, the inner wall of the support base is tightly connected to the outer wall of the discharge pipe.

[0013] Furthermore, a mechanical seal is provided at the rotating bearing.

[0014] Furthermore, the rotation driving device is configured such that a hand wheel is manually driven to rotate the rotating shaft, or the rotation driving device uses a motor to drive the rotating shaft to rotate.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] (1) By arranging a discharge pipe at the bottom of the furnace body and arranging an adjustable blocking device inside the discharge pipe, the movement stroke of the blocking device is reduced, and the discharge pipe is effectively blocked while being safer and more reliable to use, thereby reducing safety hazards;

[0017] (2) A detachable discharge control device is provided at the bottom of the discharge pipe, and the inner sleeve can be regularly removed from the discharge pipe for cleaning, effectively preventing the discharge pipe and the discharge port from being blocked and extending the service life of the discharge pipe;

[0018] (3) By sealing the bottom end of the inner sleeve and setting a support base at the bottom end of the discharge pipe, a double-layer closure of the bottom end outlet of the discharge pipe can be achieved, which can effectively prevent leakage and make the use of the discharge pipe safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A.

[0021] In the figure: 1, furnace body 2, furnace cover 3, crucible 4, magnetic yoke 5, main induction coil 6, discharge pipe 7, discharge control device 8, heat insulation board 9, air brick 10, auxiliary induction coil 701, inner sleeve 702, first discharge port 703, second discharge port 704, discharge branch pipe 705, rotating shaft 706, supporting base 707, rotating bearing 708, rotating drive device 709, connecting flange. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0023] like Figure 1 , Figure 2 As shown, a medium frequency induction furnace for alloy powder production includes a furnace body 1, a furnace cover 2, a crucible 3, a magnetic yoke 4, a main induction coil 5, a discharge pipe 6 and a discharge control device 7.

[0024] Among them, a furnace cover 2 is provided at the top of the furnace body 1, a crucible 3 is provided inside the furnace body 1, a yoke 4 is fixedly provided inside the furnace body 1, a main induction coil 5 is provided on the inner side of the yoke 4, and the induction coil is provided on the outer side of the crucible 3; preferably, a sealing ring is provided between the furnace body 1 and the furnace cover 2, and the sealing ring can adopt an integrated structure of an insulation ring, a water cooling ring and a metal sealing ring, and its specific decoupling stock belongs to the prior art and is no longer specifically limited here. The furnace cover 2 is also provided with air holes, and insulation plates 8 are respectively provided at the top and bottom of the crucible 3 in the furnace body 1.

[0025] Among them, the bottom end of the furnace body 1 is also provided with a permeable brick 9 connected to the inside of the crucible 3, and the permeable brick 9 is connected to a nitrogen blowing device, through which nitrogen can be introduced into the crucible. Specifically, the nitrogen blowing device may include a nitrogen source, and the nitrogen source supplies nitrogen to the furnace through a gas pipe. The gas pipe may also be provided with a gas flow regulating valve, and the pressure of the introduced nitrogen may be 0.5-0.7Mpa. The nitrogen blowing device belongs to the prior art and is common knowledge to those skilled in the art, so it is not specifically limited here.

[0026] Among them, a discharge pipe 6 is arranged at the bottom end of the furnace body 1, and the top end of the discharge pipe 6 is connected to the inside of the crucible 3. The bottom surface of the crucible 3 is arranged to be inclined toward the discharge pipe 6 to facilitate the better outflow of the molten metal. The bottom end of the discharge pipe 6 extends out of the furnace body 1 to connect with the discharge control device 7. An auxiliary induction coil 10 is mounted on the outside of the discharge pipe 6. Through the setting of the auxiliary induction coil 10, the molten metal passing through the discharge pipe 6 can be heated to avoid the clogging of the discharge pipe 6 due to the solidification of the molten metal on the inner wall of the discharge pipe 6. At the same time, when the furnace body 1 stops working and the furnace body 1 is inspected and repaired, when the discharge pipe 6 and the discharge control device 7 are disassembled and cleaned, the auxiliary induction coil 10 is started to heat the residual metal on the inside of the discharge pipe 6, so that it is convenient for it to flow out from the bottom end of the discharge pipe 6 in a liquid state, to assist in cleaning the discharge pipe 6, effectively avoid the clogging of the discharge pipe 6, and achieve better use effect.

[0027] The discharge control device 7 comprises a rotatable inner sleeve 701 arranged inside the discharge pipe 6, the outer wall of the inner sleeve 701 is tightly connected to the inner wall of the discharge pipe 6, the bottom end of the inner sleeve 701 is closed, the side wall of the inner sleeve 701 is provided with a first discharge port 702, and the side wall of the discharge pipe 6 is provided with a second discharge port 703 fixed at a position corresponding to the first discharge port 702, the second discharge port 703 is connected to a discharge branch pipe 704, and the discharge branch pipe 704 is arranged to be tilted downward to facilitate the better outflow of the molten metal. In order to facilitate the cleaning of the entire discharging device, the discharging branch pipe 704 can also be detachably arranged at the second discharging port 703 through a connecting flange and other connecting structures. When the first discharging port 702 follows the inner sleeve 701 to rotate to a working position connected to the second discharging port 703, the discharging branch pipe 704 is connected to the inside of the discharging pipe 6 for discharging. The first discharging port 702 follows the inner sleeve 701 to rotate to a closed position misaligned with the second discharging port 703, and the discharging branch pipe 704 and the discharging pipe 6 are in a closed state and no discharge is performed.

[0028] The bottom end of the inner sleeve 701 is connected to a rotating shaft 705, the bottom end of the rotating shaft 705 extends out of the discharge pipe 6 and is connected to a support base 706 with a concave cross-section. The bottom of the discharge pipe 6 is inserted into the support base 706, and the inner wall of the support base 706 is tightly connected to the outer wall of the discharge pipe 6. The bottom end of the discharge pipe 6 is tightly connected to the inner bottom surface of the support base 706. The bottom end of the inner sleeve 701 is closed and the support base 706 is used to block the bottom end of the discharge pipe 6 in two layers, which can effectively prevent metal The liquid leaks out from the bottom of the discharge pipe 6, effectively reducing the occurrence of leakage. The bottom end of the rotating shaft 705 passes through the bottom plate of the supporting base 706 through the rotating bearing 707 and is connected to the rotating drive device 708. Preferably, in order to ensure the safety and reliability of use, a mechanical seal can be provided at the rotating bearing 707. The mechanical seal is a shaft sealing device of a rotating machine, which refers to at least one pair of end faces perpendicular to the rotating axis that are kept in contact and relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of the auxiliary seal. For the device for preventing fluid leakage formed by sliding, mechanical seals have the advantages of less leakage and long service life. There are many types of shaft seals, which belong to the prior art and are common knowledge to those skilled in the art, so no specific limitation is made here. The rotation drive device 708 can be set to a handwheel to manually drive the shaft 705 to rotate, or the rotation drive device 708 can also use a motor to drive the shaft 705 to rotate. This is common knowledge to those skilled in the art, and no other special requirements are made in this application. It is only necessary that it can realize the functions described in this application. Those skilled in the art can make active selections according to actual application conditions, so no specific limitation is made here. The support base 706 and the outer wall of the discharge pipe 6 are fixedly connected by a connecting flange 709. At the same time, it should be noted that due to the working environment, the structures such as the discharge pipe 6 and the discharge control device 7 can be made of refractory and heat-insulating materials. This is common knowledge to those skilled in the art, so no specific limitation is made here.

[0029] When the present invention is implemented, when in use, the support base 706 is installed and fixedly installed at the bottom end of the discharge pipe 6 through the connecting flange 709. At this time, the inner sleeve 701 is inserted into the discharge pipe 6, and the bottom of the discharge pipe 6 is inserted into the support base 706. The outer wall of the inner sleeve 701 is tightly connected to the inner wall of the discharge pipe 6, the outer wall of the discharge pipe 6 is tightly connected to the inner wall of the support base 706, and the bottom end of the discharge pipe 6 is tightly connected to the inner bottom surface of the support base 706. The first discharge port 702 on the inner sleeve 701 and the second discharge port 703 on the side wall of the discharge pipe 6 are on a coaxial cylindrical surface. After the support base 706 is fixedly installed, the rotating shaft 705 and the inner sleeve 701 are driven to rotate by the rotating drive device 708 to adjust the first discharge port The position of the material port 702 makes the first discharge port 702 and the second discharge port 703 staggered, and the first discharge port 702 and the second discharge port 703 are closed to achieve the blocking of the discharge pipe 6. After the furnace cover 2 is opened and metal raw materials such as pure iron or pure nickel are added into the furnace body 1, the furnace body 1 can be started to work. When the metal raw materials are melted and need to be unloaded, the rotating shaft 705 and the inner sleeve 701 are driven to rotate by the rotating drive device 708, and the first discharge port 702 is rotated to the position of the second discharge port 703, so that the first discharge port 702 and the second discharge port 703 overlap and are connected, the discharge pipe 6 and the discharge branch pipe 704 are connected, and the molten metal can be discharged through the discharge pipe 6 and the discharge branch pipe 704 to complete the unloading.

[0030] When it is necessary to clean the discharge pipe 6 and the discharge control device 7, it is only necessary to loosen the bolts of the connecting flange 709, separate the support base 706 from the discharge pipe 6, move the support base 706 downward, pull the bottom of the discharge pipe 6 out of the support base 706, and continue to move the support base 706 downward until the inner sleeve 701 is pulled out of the discharge pipe 6. The inner sleeve 701 and the discharge pipe 6 can then be cleaned. At the same time, the auxiliary induction coil 10 can also be started to heat the metal remaining on the inner wall of the discharge pipe 6 so that it can flow out better in a liquid state to avoid clogging the discharge pipe 6. After cleaning, the support base 706 and the inner sleeve 701 can be installed. It is convenient and labor-saving to use, has higher safety performance, and effectively extends the service life of the discharge pipe 6.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A medium frequency induction furnace for alloy powder production, characterized in that: The invention comprises a furnace body (1), a furnace cover (2), a crucible (3), a magnetic yoke (4), a main induction coil (5), a discharge pipe (6) and a discharge control device (7), wherein the furnace body (1) is provided with a furnace cover (2) at the top, the furnace body (1) is provided with a crucible (3) inside, the furnace body (1) is fixedly provided with a magnetic yoke (4) inside, the main induction coil (5) is provided inside the magnetic yoke (4), the induction coil is provided outside the crucible (3), the furnace body (1) is provided with a discharge pipe (6) at the bottom, and the top of the discharge pipe (6) is connected to a Inside the crucible (3), the bottom end of the discharge pipe (6) extends out of the furnace body (1) and is detachably connected to a discharge control device (7), the discharge control device (7) comprising a rotatable inner sleeve (701) arranged inside the discharge pipe (6), the outer wall of the inner sleeve (701) is tightly connected to the inner wall of the discharge pipe (6), the bottom end of the inner sleeve (701) is closed, the side wall of the inner sleeve (701) is provided with a first discharge port (702), and the side wall of the discharge pipe (6) is provided with a position fixed to the first discharge port (702). A second discharge port (703) is provided, the second discharge port (703) is connected to a discharge branch pipe (704), when the first discharge port (702) rotates along with the inner sleeve (701) to a working position in communication with the second discharge port (703), the discharge branch pipe (704) is in communication with the inside of the discharge pipe (6) for discharge, the first discharge port (702) rotates along with the inner sleeve (701) to a closed position in a position offset from the second discharge port (703), the discharge branch pipe (704) and the discharge pipe (6) are in a closed state No material is discharged, the bottom end of the inner sleeve (701) is connected to a rotating shaft (705), the bottom end of the rotating shaft (705) extends out of the bottom end of the discharge pipe (6) and is connected to a support base (706) having a concave cross-section structure, the bottom of the discharge pipe (6) is inserted into the support base (706), the bottom end of the rotating shaft (705) penetrates the bottom plate of the support base (706) through a rotating bearing (707) and is connected to a rotating drive device (708), and the support base (706) and the outer wall of the discharge pipe (6) are fixedly connected via a connecting flange (709).

2. The medium frequency induction furnace for alloy powder production according to claim 1, characterized in that: A sealing ring is provided between the furnace body (1) and the furnace cover (2), and a ventilation hole is provided on the furnace cover (2).

3. The medium frequency induction furnace for alloy powder production according to claim 1, characterized in that: Heat insulation plates (8) are respectively arranged at the top and bottom of the crucible (3) in the furnace body (1).

4. The medium frequency induction furnace for alloy powder production according to claim 1, characterized in that: A gas-permeable brick (9) communicating with the interior of the crucible (3) is also provided at the bottom end of the furnace body (1), and the gas-permeable brick (9) is connected to a nitrogen blowing device.

5. The medium frequency induction furnace for alloy powder production according to claim 1, characterized in that: An auxiliary induction coil (10) is sleeved on the outside of the discharge pipe (6).

6. The medium frequency induction furnace for alloy powder production according to claim 1, characterized in that: The discharge branch pipe (704) is arranged to be inclined downward, and the inner bottom surface of the crucible (3) is arranged to be inclined towards the discharge pipe (6).

7. The medium frequency induction furnace for alloy powder production according to claim 1, characterized in that: The inner wall of the support base (706) is tightly connected to the outer wall of the discharge pipe (6).

8. The medium frequency induction furnace for alloy powder production according to claim 1, characterized in that: The rotary bearing (707) is provided with a mechanical seal.

9. The medium frequency induction furnace for alloy powder production according to claim 1, characterized in that: The rotation driving device (708) is configured such that a hand wheel is used to manually drive the rotating shaft (705) to rotate, or the rotation driving device (708) uses a motor to drive the rotating shaft (705) to rotate.

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