Pure magnesium alloy smelting heat preservation standing furnace

Abstract

The invention relates to the technical field of magnesium alloy cast rolling liquid supply devices, and discloses a pure magnesium alloy smelting heat preservation standing furnace. The standing furnace comprises an upper cover and a furnace body shell, and a shutter isolation device and a magnet adsorption device are arranged in the standing furnace. When the magnesium alloy melt stands, iron impurities in the melt are fully adsorbed under the action of the magnet adsorption device, and the impurity iron element can be prevented from being transferred during liquid transfer, so that the impurity iron in the magnesium alloy melt is effectively removed, and the effect of staticizing the melt is achieved; the shutter device is controlled to be closed, so that the stirring of the liquid at the lower part caused by the rotary stirring of the pump during liquid transfer is greatly reduced, and the purity and the product quality of a final product are improved.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium alloy casting and rolling liquid supply devices, and in particular to a pure magnesium alloy smelting and heat-insulating static furnace. Background Art

[0002] Magnesium alloys have been widely used in aerospace, automobile manufacturing, electronics and other fields due to their low density, high specific strength and good damping properties. With the advancement of science and technology and the development of industry, the quality and performance requirements of magnesium alloys are becoming higher and higher. Therefore, in the smelting process of magnesium alloys, advanced equipment and processes are needed to ensure the purity and quality of magnesium alloys.

[0003] In the continuous casting and rolling production process of magnesium alloys, smelting and standing is a key link. The magnesium alloy smelting and standing furnace is a key equipment used in the magnesium alloy smelting process. The pure magnesium alloy smelting and standing furnace is designed to meet this demand. During the smelting process, the magnesium alloy raw materials are heated and melted in the smelting furnace, and then poured into the standing chamber in a certain way. In the standing chamber, the impurities in the molten magnesium alloy can be fully precipitated and standing. During production, the magnesium liquid except the bottom of the standing furnace is transferred as much as possible to ensure the purity and quality of the magnesium liquid. However, the magnesium liquid after standing generally needs to be pumped for liquid transfer production or utilization. The position of the pump is generally located in the lower middle part of the liquid in the standing furnace. No matter what kind of pump is used, the rotating suction method of the pump during the liquid transfer will cause disturbance of the magnesium liquid in the standing furnace, so that the precipitated impurities enter the pure magnesium liquid and are sucked and transferred by the pump, which greatly affects the effect of standing, causing the impurity content of the magnesium liquid to exceed the standard and affecting the subsequent product quality. Therefore, in order to improve the purity of the product, a static furnace is needed that can control the slag at the bottom of the furnace from being turned over and sucked away when the magnesium alloy liquid is extracted.

[0004] In addition, iron is a harmful impurity element in magnesium alloys. Due to the active chemical properties of magnesium alloys, when iron is present, it will form a micro-battery with magnesium, with iron acting as the cathode and magnesium acting as the anode, accelerating the corrosion process of magnesium. This phenomenon is called galvanic corrosion. The traditional method of iron removal is to place the magnesium liquid in a static furnace for a long enough time to allow iron impurities to settle to the bottom of the magnesium liquid. This method is time-consuming, wastes energy, and is difficult to completely remove iron impurities. Therefore, how to reduce the harmful element iron in the magnesium liquid and thus enhance the corrosion resistance of the magnesium alloy is also an urgent problem to be solved. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a pure magnesium alloy smelting and heat-insulating static furnace to solve the technical problems of removing iron impurities in the magnesium alloy liquid and causing disturbance of the magnesium liquid in the static furnace due to the rotating suction force of the pump during liquid transfer, and the precipitated impurities entering the pure magnesium liquid and being sucked and transferred by the pump, affecting the purity of the casting.

[0006] In order to solve the problem of iron impurities, a magnet adsorption device is set in the static furnace to suck out the iron impurities from the melt. In order to solve the problem of the melt being stirred by the pump, a mechanical device similar to a louver is placed in the lower part of the melt. When the pump needs to transfer the liquid, the relevant device is rotated to isolate the bottom impurities from the upper pure melt, thereby avoiding the disturbance of the melt caused by the rotation of the pump, thereby achieving the purpose of transferring pure magnesium liquid.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions: A pure magnesium alloy smelting and heat-insulating static furnace comprises an upper cover and a furnace body shell. A louver isolation device and a magnet adsorption device are arranged in the static furnace.

[0008] Preferably, the shutter isolation device comprises a shutter located in the static furnace and a shutter connecting rod handle located above the static furnace; the shutter is fixed to the bottom of the inner surface of the crucible, and comprises a shutter frame, a shutter shaft, a shutter rocker arm, shutters, and a shutter connecting rod; the shutter connecting rod is a "T"-shaped structure or an "L"-shaped structure, the upper part is connected to the shutter connecting rod handle, and the lower part passes through the central axis of the shutter frame, connecting the shutter rocker arms on each shutter, and by manipulating the shutter connecting rod handle, the shutter connecting rod is driven to rotate, and then the shutter rocker arm is driven to rotate, so as to control the direction of the shutter to be parallel or vertical. When the shutter is in a closed state, the bottom impurities are isolated from the upper pure melt.

[0009] Preferably, the magnetic adsorption device includes a permanent magnet bar and an embedded magnet.

[0010] Preferably, the permanent magnet rod is fixed on the refractory bricks of the upper cover of the static furnace, and the upper cover is driven up or down by controlling the lifting and lowering of a turbine rod elevator connected to the upper cover of the static furnace to insert or remove the permanent magnet rod into or out of the magnesium alloy melt.

[0011] Preferably, the embedded magnet interlayer is embedded between the refractory bricks of the furnace body.

[0012] When the magnesium alloy melt in the static furnace is in a static state, under the joint action of the permanent magnet rod and the embedded magnet, the iron impurities in the magnesium alloy melt are fully and firmly adsorbed, which can effectively prevent the impure iron elements in the magnesium alloy melt from being transferred to the next step during the liquid transfer process after static, thereby effectively removing the impurity iron and achieving the effect of staticizing the melt.

[0013] Preferably, the shutter connecting rod handle and the shutter connecting rod are detachably connected. When the upper cover of the static furnace is lifted, the shutter connecting rod handle is separated from the shutter connecting rod, which facilitates the removal of the melt.

[0014] Preferably, an exhaust hole and a liquid inlet hole are provided on the top of the upper cover to facilitate exhaust and liquid inlet.

[0015] Preferably, a heat insulation plate and refractory bricks are fixed inside the upper cover to reduce heat transfer; the crucible heating wire is fixed to the inner surface of the refractory bricks of the furnace body to achieve heating of the furnace body; the crucible fixing plate and the crucible are surrounded by the refractory bricks of the furnace body.

[0016] Preferably, the furnace body heat insulation board and the furnace body refractory bricks are sequentially arranged inside the furnace body shell, and the heat insulation board plays the role of heat insulation.

[0017] Preferably, a stainless steel protective plate for the upper cover is provided at the lower edge of the upper cover, and a stainless steel protective plate for the furnace body is provided at the upper edge of the furnace body shell, so as to achieve better sealing between the upper cover and the furnace body shell.

[0018] Preferably, an upper cover slider fixing plate and an upper cover screw fixing plate are fixedly arranged on the side of the upper cover so as to achieve connection with the turbine rod elevator.

[0019] Preferably, a bracket is fixedly connected to the outer periphery of the furnace body shell, and a turbine rod elevator, an elevator screw and a guide rail are fixedly arranged on the bracket, the guide rail slider is fixedly connected to the upper cover slider fixing plate of the upper cover, and the elevator screw is fixedly connected to the upper cover screw fixing plate, so that the turbine rod elevator is operated, the worm is driven to rotate by the hydraulic motor, and then the spiral part of the worm is engaged with the turbine to drive the turbine to rotate, and the spiral part of the turbine is engaged with the spiral part of the lifting rod, so that the rotation of the turbine drives the elevator screw to move up and down to realize the lifting and lowering of the upper cover, thereby controlling the immersion or removal of the permanent magnet rod into or out of the melt.

[0020] Preferably, the furnace shell is also provided with furnace shell lifting ears and drain ports to facilitate the movement of the stationary furnace.

[0021] Preferably, a base is provided under the furnace shell for support.

[0022] The beneficial effects of the present invention are as follows: Compared with conventional static furnaces, the present invention significantly improves the quality of the melt by arranging a magnet adsorption device and a louver isolation device.

[0023] When the magnesium alloy melt is at rest in the static furnace of the present invention, the iron impurities in the melt are fully adsorbed under the joint action of the permanent magnet rod and the embedded magnet. During the liquid transfer process after resting, the impure iron elements can be prevented from being transferred, thereby effectively removing the impurity iron in the magnesium alloy melt and achieving the effect of staticizing the melt.

[0024] The static furnace of the present invention is also provided with a louver device. During the liquid transfer process after static placement, the louver device in the furnace is closed by an external connecting rod. During the liquid transfer process, the liquid transfer pump greatly reduces the agitation of the lower liquid caused by the rotation and agitation of the pump, thereby preventing impurities that have sunk to the bottom from being brought into the subsequent products due to the agitation of the melt, thereby improving the purity and product quality of the final product. In the existing static furnace without a louver device, when the liquid transfer pump in the static furnace magnesium alloy solution is started to transfer the magnesium alloy solution to the next process, the start-up of the liquid transfer pump will inevitably cause the magnesium alloy solution to be agitated, and then the impurities that have sunk to the bottom will be brought back into the upper pure liquid, and thus transferred to the next process together with the impurities, affecting the quality of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0026] Figure 1 It is a three-dimensional assembly diagram of a static furnace for melting pure magnesium alloy.

[0027] Figure 2 This is a cross-sectional view of a static furnace for melting pure magnesium alloy.

[0028] Figure 3 This is a schematic diagram of the louver structure of a static furnace for smelting pure magnesium alloy.

[0029] Figure numerals: 1 upper cover, 2 upper cover stainless steel protection plate, 3 insulation plate, 4 upper cover refractory brick, 5 crucible fixing plate, 6 furnace body stainless steel protection plate, 7 furnace body refractory brick, 8 insulation plate, 9 furnace body shell, 10 base, 11 louver connecting rod handle, 12 exhaust hole, 13 liquid inlet hole, 14 crucible, 15 permanent magnet rod, 16 louver, 17 crucible heating wire, 18 turbine rod lifter, 19 guide rail, 20 embedded magnet, 21 guide rail slider, 22 upper cover slider fixing plate, 23 elevator screw, 24 upper cover screw fixing plate, 25 furnace shell lifting ear, 26 drain port, 15-01 louver frame, 15-02 louver shaft, 15-03 louver rocker arm, 15-04 louver, 15-05 louver connecting rod. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0031] See also Figures 1 to 3 : A pure magnesium alloy smelting heat-insulating static furnace comprises an upper cover 1 and a furnace shell 9. A louver isolation device and a magnet adsorption device are arranged in the static furnace.

[0032] The louver isolation device includes a louver 16 located in the static furnace and a louver connecting rod handle 11 located above the outside of the static furnace; the louver 16 is fixed to the bottom of the inner surface of the crucible 14, including a louver frame 15-01, a louver shaft 15-02, a louver rocker arm 15-03, louvers 15-04, and a louver connecting rod 15-05. The louver connecting rod 15-05 is a "T"-shaped structure, the upper part of which is connected to the louver connecting rod handle 11, and the lower part passes through the central axis of the louver frame 15-01, connecting the louver rocker arm 15-03 on each louver 15-04, and by manipulating the louver connecting rod handle 11, the louver connecting rod 15-05 is driven to rotate, and then the louver rocker arm 15-03 is driven to rotate, thereby controlling the direction of the louver 15-04 to be parallel or vertical. When the shutter 16 is in a closed state, the bottom impurities are isolated from the upper pure melt.

[0033] The magnet adsorption device includes a permanent magnet bar 15 and an embedded magnet 20 .

[0034] The permanent magnet rod 15 is fixed on the refractory brick 4 of the upper cover 1 of the static furnace. By controlling the lifting and lowering of the turbine rod elevator 18 connected to the upper cover 1 of the static furnace, the upper cover 1 is driven to rise or fall, so that the permanent magnet rod 15 can be inserted into or removed from the magnesium alloy melt.

[0035] The embedded magnets 20 are embedded in the furnace body refractory bricks 7 in layers.

[0036] When the magnesium alloy melt in the static furnace is in a static state, under the joint action of the permanent magnet rod 15 and the embedded magnet 20, the iron impurities in the magnesium alloy melt are fully and firmly adsorbed, which can effectively prevent the impure iron elements in the magnesium alloy melt from being transferred to the next step during the liquid transfer process after static, thereby effectively removing the impurity iron and achieving the effect of staticizing the melt.

[0037] The shutter connecting rod handle 11 and the shutter connecting rod 15-05 are detachably connected. When the upper cover 1 of the static furnace is lifted, the shutter connecting rod handle 11 is separated from the shutter connecting rod 15-05, which is convenient for taking out the melt.

[0038] The top of the upper cover 1 is provided with an exhaust hole 12 and a liquid inlet 13 for facilitating exhaust and liquid inlet.

[0039] The upper cover 1 is fixed with a heat insulation board 3 and upper cover refractory bricks 4 to reduce heat transfer; the crucible heating wire 17 is fixed to the inner surface of the furnace body refractory bricks 7 to achieve heating of the furnace body; the crucible fixing plate 5 and the crucible 14 are surrounded by the furnace body refractory bricks 7.

[0040] The furnace body heat insulation board 8 and the furnace body refractory bricks 7 are sequentially arranged inside the furnace body shell 9, and the heat insulation board 8 plays the role of heat insulation.

[0041] An upper cover stainless steel protection plate 2 is arranged at the lower edge of the upper cover 1 , and a furnace body stainless steel protection plate 6 is arranged at the upper edge of the furnace body shell 9 , so as to achieve better sealing between the upper cover 1 and the furnace body shell 9 .

[0042] An upper cover slider fixing plate 22 and an upper cover screw fixing plate 24 are fixedly arranged on the side of the upper cover 1 so as to realize the connection with the turbine rod lifting machine 18 .

[0043] The outer periphery of the furnace body shell 9 is fixedly connected to a bracket, on which a turbine worm gear lift 18 is fixedly arranged, and a lift screw 23 is inserted into an upper cover screw fixing plate 24, and a guide rail slider 21 is fixed to the upper cover slider fixing plate 22 by bolts, and a center hole of the guide rail slider 21 is matched with a center axis of the guide rail 19 so that the guide rail slider 21 can move up and down along the guide rail 19, thereby operating the turbine worm gear lift 18, driving the worm to rotate through a hydraulic motor, and then the spiral part of the worm engages with the turbine to drive the turbine to rotate, and the central spiral part of the turbine engages with the spiral part of the lift rod, so that the rotation of the turbine drives the lift screw 23 to move up and down, driving the upper cover screw fixing plate 24 to move up and down, and then the upper cover screw fixing plate 24 will drive the upper cover slider fixing plate to move up and down along the guide rail 19 through the guide rail slider 21, and finally realize the lifting and lowering of the upper cover 1, thereby controlling the immersion or removal of the permanent magnet rod 15 in the melt.

[0044] The furnace shell 9 is also provided with furnace shell lifting lugs 25 to facilitate the movement of the stationary furnace. A base 10 is provided below the furnace shell 9 for support.

[0045] When the magnesium alloy melt is transferred to the static furnace, the shutter 16 is in an open state, the upper cover 1 is in a closed and sealed state, and the permanent magnet rod 15 connected to the upper cover 1 is inserted into the magnesium alloy solution. After standing for a period of time, the impurities in the magnesium alloy melt sink to the bottom, and the iron elements in the melt will be adsorbed to the permanent magnet rod 15 or the embedded magnet 20 on the crucible wall.

[0046] After the standing time reaches the set time, the louver 16 is closed by operating the louver connecting rod handle 11 located above the outside of the standing furnace to separate the lower slag area of ​​the magnesium alloy melt in the standing furnace from the upper pure area, and the liquid transfer pump in the magnesium alloy melt in the standing furnace is started. At this time, the operation of the liquid transfer pump will not cause stirring to the lower slag area, thereby avoiding impurities in the slag area from entering the pump and being transferred to the next process, thereby ensuring the purity of the magnesium alloy melt.

[0047] When the pure magnesium melt in the static furnace is transferred, the bottom sediment in the crucible is drained through the drain port 26 at the bottom of the static furnace, and the impurities of the embedded magnet 20 adsorbed on the permanent magnet rod 15 and the crucible wall are cleaned up to prepare for the next production.

[0048] 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 aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A pure magnesium alloy smelting and heat-insulating static furnace, comprising an upper cover (1) and a furnace shell (9), characterized in that: The static furnace is provided with a shutter isolation device and a magnet adsorption device; The louver isolation device comprises a louver (16) located in a stationary furnace and a louver connecting rod handle (11) located above the outside of the stationary furnace; the louver (16) comprises a louver frame (15-01), a louver shaft (15-02), a louver rocker arm (15-03), louvers (15-04), and a louver connecting rod (15-05); the louver connecting rod (15-05) is a "T"-shaped structure or an "L"-shaped structure. The structure has an upper portion connected to the shutter connecting rod handle (11), and a lower portion penetrating the central axis of the shutter frame (15-01), connecting the shutter swing arms (15-03) on each shutter (15-04), and by controlling the shutter connecting rod handle (11), the shutter connecting rod (15-05) is driven to rotate, thereby driving the shutter swing arm (15-03) to rotate, thereby controlling the direction of the shutters (15-04) to be parallel or vertical; The magnet adsorption device comprises a permanent magnet rod (15) and an embedded magnet (20); the permanent magnet rod (15) is fixed on the refractory brick (4) of the upper cover (1) of the static furnace, and the upper cover (1) is driven to rise or fall by controlling the lifting and lowering of a turbine rod lifter (18) connected to the upper cover (1) of the static furnace, so that the permanent magnet rod (15) can be inserted into or removed from the magnesium alloy melt.

2. The static furnace according to claim 1, characterized in that: The louver window (16) is fixed to the bottom of the inner surface of the crucible (14); the embedded magnet (20) is embedded in the furnace body refractory bricks (7).

3. The static furnace according to claim 1, characterized in that: The shutter connecting rod handle (11) and the shutter connecting rod (15-05) are detachably connected. When the upper cover (1) of the static furnace is lifted, the shutter connecting rod handle (11) and the shutter connecting rod (15-05) are separated.

4. The static furnace according to claim 1, characterized in that: An exhaust hole (12) and a liquid inlet hole (13) are provided on the top of the upper cover (1).

5. The static furnace according to claim 1, characterized in that: A heat insulation board (3) and upper cover refractory bricks (4) are fixed inside the upper cover (1); a crucible heating wire (17) is fixed to the inner surface of the furnace body refractory bricks (7) to achieve heating of the furnace body; and the crucible fixing plate (5) and the crucible (14) are surrounded by the furnace body refractory bricks (7).

6. The static furnace according to claim 1, characterized in that: The furnace body heat insulation board (8) and the furnace body refractory bricks (7) are arranged in sequence inside the furnace body shell (9).

7. The static furnace according to claim 1, characterized in that: An upper cover stainless steel protection plate (2) is provided at the lower edge of the upper cover (1), and a furnace body stainless steel protection plate (6) is provided at the upper edge of the furnace body shell (9).

8. The static furnace according to claim 1, characterized in that: An upper cover slider fixing plate (22) and an upper cover screw fixing plate (24) are fixedly arranged on the side of the upper cover (1) so as to realize connection with the turbine rod lifting machine (18).

9. The static furnace according to claim 1, characterized in that: The outer periphery of the furnace shell (9) is fixedly connected to a bracket, on which a worm gear elevator (18), an elevator screw (23) and a guide rail (19) are fixedly arranged, the guide rail slider (21) is fixedly connected to an upper cover slider fixing plate (22) of the upper cover (1), and the elevator screw (23) is fixedly connected to an upper cover screw fixing plate (24), so that by controlling the operation of the worm gear elevator (18), the upper cover (1) can be raised and lowered, thereby controlling the immersion or removal of the permanent magnet rod (15) in the melt.

10. The static furnace according to claim 1, characterized in that: The furnace shell (9) is also provided with furnace shell lifting ears (25) and a drain port (26), and a base (10) is provided below the furnace shell (9).

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