Vacuum powder spraying device for metal smelting

Abstract

The utility model provides a metal smelting vacuum powder spraying device which comprises a vacuum chamber, a powder spraying gun lifting mechanism and a powder spraying gun, the powder spraying gun lifting mechanism and the powder spraying gun are arranged in the vacuum chamber, the powder spraying gun lifting mechanism comprises a steel supporting frame arranged upwards from the bottom of the vacuum chamber, and a lifting trolley is arranged on the steel supporting frame; a vertically downward powder spraying gun is installed on the trolley, the upper end of the powder spraying gun is connected with one end of a powder inlet pipe, the other end of the powder inlet pipe is arranged on the side wall of the vacuum chamber in a penetrating mode, connected with a powder bin and provided with a valve, and a powder blowing device facing the powder inlet pipe is arranged in the powder bin. The part, located in the vacuum chamber, of the powder inlet pipe is arranged in the drag chain. According to the utility model, continuous feeding and powder spraying can be realized in a vacuum state, the powder spraying position of the powder spraying gun can be adjusted, and the smelting efficiency and the smelting reaction stability are improved.

Description

Technical Field

[0001] This utility model relates to the field of metal smelting equipment technology, and more specifically, to a vacuum powder spraying device for metal smelting. Background Technology

[0002] Magnesium, the eighth most abundant element in the Earth's crust, is a lightweight metal with excellent physicochemical properties, such as low density, high strength-to-weight ratio, and good thermal and electrical conductivity. In nature, magnesium mainly exists in mineral form, such as magnesite, dolomite, and is abundant in seawater. Currently, magnesium and magnesium alloys are used in various fields, including aerospace, automotive, electronics, and building materials. With the advancement of energy conservation and emission reduction policies, especially the increasing demand for lightweight materials in the automotive industry, the demand for magnesium, as a lightweight and high-strength metal, will continue to rise.

[0003] Magnesium production is mainly divided into two methods: electrolysis, which extracts magnesium from seawater and obtains pure magnesium through electrolysis; and thermal reduction, which uses magnesite or dolomite as raw materials and extracts magnesium through a high-temperature reduction reaction. Thermal reduction methods are further divided into the Pidgeon process, vertical tank internal heating process, and liquid jetting process.

[0004] Powder injection devices are crucial for the liquid injection method in magnesium smelting, significantly impacting the thermal reduction efficiency, stability, and maintenance frequency of the process. However, existing metal smelting powder injection devices employ discontinuous feeding, requiring manual feeding of the injection gun. This prevents continuous powder injection and production, resulting in actual reaction rates far below the maximum reaction rate achievable by the molten pool, leading to low smelting efficiency. Furthermore, during smelting, traditional powder injection devices typically inject powder at the surface of the molten pool, and the injection position is not adjustable. This suboptimal reaction location results in slow and incomplete reactions, further contributing to low smelting efficiency. Utility Model Content

[0005] In view of the above problems, the purpose of this utility model is to provide a vacuum powder spraying device for metal smelting, which can realize continuous feeding and powder spraying under vacuum conditions, and the powder spraying position of the spraying gun can be adjusted to ensure that the powder is sprayed out at the ideal liquid level for reaction, thereby improving smelting efficiency and the stability of smelting reaction.

[0006] This utility model provides a vacuum powder spraying device for metal smelting, comprising a vacuum chamber, a powder spraying gun lifting mechanism disposed within the vacuum chamber, and a powder spraying gun, wherein...

[0007] The powder spray gun lifting mechanism includes a steel support frame that is installed from the bottom of the vacuum chamber upwards, and a liftable trolley is installed on the steel support frame;

[0008] A vertically downward powder spraying gun is installed on the trolley. The upper end of the powder spraying gun is connected to one end of the powder inlet pipe. The other end of the powder inlet pipe passes through the side wall of the vacuum chamber and is connected to the powder hopper. A valve is provided. A powder blowing device facing the powder inlet pipe is provided in the powder hopper. The part of the powder inlet pipe located in the vacuum chamber is set in the cable chain.

[0009] The trolley lowers the powder spraying gun so that it extends out of the bottom of the vacuum chamber and enters the vacuum reaction chamber connected to the vacuum chamber. The valve opens and the powder blowing device feeds the powder into the powder inlet pipe, while the powder spraying gun sprays powder.

[0010] The steel support frame includes a central frame and side frames on both sides of the central frame. Vertical rails are provided in the middle of the central frame and on the side frames, and limit baffles are provided at both ends of the rails. The trolley includes a central frame. Upper side frames are vertically connected to the upper ends of one side of the central frame, and lower side frames are vertically connected to the lower ends of the side. Powder spray gun fixing components are provided between the two lower side frames and the two upper side frames. Wheel mounting rods are provided at the upper and lower ends of the other side of the central frame, and wheels adapted to the corresponding rails are provided on the wheel mounting rods. The trolley is disposed inside the steel support frame, and the wheels are disposed on the corresponding rails.

[0011] The powder spraying gun fixing component includes an outer peripheral flange fixed to the outer periphery of the powder spraying gun, a connecting flange bolted to the outer peripheral flange, and two hanging rods connected to the outer wall of the connecting flange. The two hanging rods are collinear with a diameter of the connecting flange. A first pin hole is provided on the hanging rod, and the central axis of the first pin hole is parallel to the central axis of the connecting flange. Grooves are provided at the outer ends of the upper frame and the lower frame, and vertical second pin holes are provided in the grooves. The hanging rods are respectively placed in the corresponding grooves and connected by pins passing through the opposite first and second pin holes.

[0012] The powder spray gun lifting mechanism also includes a reduction motor disposed outside the vacuum chamber. The drive shaft of the reduction motor passes through the side wall of the vacuum chamber and is connected to a sprocket assembly. A chain is engaged on the sprocket assembly, and the two ends of the chain are respectively connected to the upper and lower ends of the trolley. The drive shaft is rotatably connected to the side wall of the vacuum chamber through a first dynamic sealing device.

[0013] A laser rangefinder that faces the trolley is installed above the steel support frame, and an encoder is installed on the geared motor.

[0014] It also includes a fall protection mechanism, which includes a rotating motor installed below the outside of the vacuum chamber. The rotating motor's shaft passes through the side wall of the vacuum chamber and is connected to the drum of a winch installed at the bottom of the vacuum chamber. Two sets of steel wire ropes are installed on the drum. The two sets of steel wire ropes pass around two sets of fixed pulleys on the upper part of the steel support frame and are connected to the upper ends of the trolley. The winch and the trolley operate synchronously in lifting and lowering. The rotating shaft is rotatably connected to the side wall of the vacuum chamber through a second dynamic sealing device.

[0015] A bellows is connected to the bottom of the vacuum chamber, a slide valve is provided at the lower end of the bellows, a connecting pipe connected to the reaction chamber is provided below the slide valve, and a dust valve is provided on the connecting pipe; the powder spraying gun is directed directly at the center of the bellows.

[0016] The dust-blocking valve includes a first valve plate and a second valve plate that are open in opposite directions. When the first valve plate and the second valve are closed, they cover the cross-section of the connecting pipe and have a circular hole in the middle. The powder spraying gun is located in the circular hole.

[0017] The vacuum chamber includes a cylindrical vacuum chamber and a box-shaped vacuum chamber connected vertically. The box-shaped vacuum chamber and the cylindrical vacuum chamber are connected by a flange and bolts. The cross-sectional area of ​​the cylindrical vacuum chamber is smaller than that of the box-shaped vacuum chamber. One side wall of the cylindrical vacuum chamber is aligned with one side wall of the box-shaped vacuum chamber.

[0018] A thermal control coating is applied to the side of the steel support frame facing the powder spray gun, and a water cooling system is provided on the outer wall of the vacuum chamber.

[0019] As described above, the metal smelting vacuum powder spraying device provided by this utility model has a powder spraying gun connected to an external powder silo via a flexible hose, enabling automatic feeding. Closed-loop control is achieved through laser ranging and an encoder, dynamically adjusting the lifting trolley to control the powder spraying position of the gun. The gate valve and dust barrier valve automatically open and close according to the working conditions and the position of the powder spraying gun. This utility model achieves automatic feeding and continuous powder spraying throughout the entire smelting process, with adjustable powder spraying position, uninterrupted smelting, high smelting efficiency, high equipment adaptability, automated powder spraying, and reduced labor costs. Attached Figure Description

[0020] Other objects and results of this invention will become more apparent and readily understood upon referring to the following description taken in conjunction with the accompanying drawings, and with a more complete understanding of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a vacuum powder spraying device for metal smelting according to an embodiment of the present utility model;

[0022] Figure 2 This is a side view of the powder spray gun lifting mechanism according to an embodiment of the present utility model;

[0023] Figure 3 for Figure 1 AA view;

[0024] Figure 4 for Figure 1 BB view;

[0025] Among them, 1-vacuum chamber, 11-cylindrical vacuum chamber, 12-box-shaped vacuum chamber;

[0026] 2-Powder spray gun lifting mechanism, 21-Steel support frame, 211-Intermediate frame, 212-Side frame, 22-Railway, 23-Limit baffle, 24-Gear motor, 241-Encoder, 25-Sprocket assembly, 251-Drive sprocket, 252-Support sprocket, 26-Chain, 27-First dynamic sealing device, 28-Laser rangefinder;

[0027] 3-Cart, 31-Intermediate frame, 32-Upper frame, 33-Lower frame, 34-Powder spray gun fixing component, 341-Outer flange, 342-Connecting flange, 343-Hanging rod, 344-Pin, 35-Wheel mounting rod, 36-Wheel;

[0028] 4-Feeding mechanism, 41-Powder inlet pipe, 42-Drag chain, 43-Valve, 44-Powder blowing device;

[0029] 5-Anti-fall mechanism, 51-Rotating motor, 52-Winder, 53-Wire rope, 54-Fixed pulley, 55-Second dynamic sealing device;

[0030] 6-Connecting channel, 61-Bellbell, 62-Slide valve, 63-Connecting pipe, 64-Dust barrier valve, 641-First valve plate, 642-Second valve plate;

[0031] 7-Powder spray gun;

[0032] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0033] This invention can be modified in various ways and has various embodiments, with specific embodiments illustrated in the accompanying drawings. However, this invention is not limited to this specific implementation and all modifications, equivalents, and substitutions falling within the spirit and technical scope of this invention are to be understood as included.

[0034] Ordinal terms such as "first," "second," etc., may be used to describe various constituent elements, but the constituent elements are not limited to these terms. The terms are used only to distinguish one constituent element from another. For example, without departing from the scope of the claims of this utility model, a second constituent element may be named a first constituent element, and similarly, a first constituent element may be named a second constituent element. Terms and / or include combinations of multiple associated items or one of multiple associated items.

[0035] It should be understood that when referring to a constituent element being "connected" or "in contact" with other constituent elements, this includes not only cases where it is directly connected or in contact with other constituent elements, but also cases where other constituent elements exist between them. Conversely, when referring to a constituent element being "directly connected" or "directly in contact" with other constituent elements, it should be understood that no other constituent elements exist between them.

[0036] In the description of the embodiments, when it is stated that a certain component is formed "on or under" other components, "on or under" includes both two components that are in direct contact with each other and at least one other component that is configured to be formed between the two components. Furthermore, when expressed as "on or under", based on a certain component, it refers not only to the upper direction but may also include the lower direction.

[0037] The terminology used in this application is for illustrative purposes only and is not intended to limit the scope of the invention. Unless the context clearly specifies otherwise, singular expressions include plural expressions. In this application, terms such as "comprising" or "having" are used to specify the presence of features, numbers, steps, operations, constituent elements, components, or combinations thereof described in the specification, and do not preclude the presence or additional possibilities of one or more other features, numbers, steps, operations, constituent elements, components, or combinations thereof.

[0038] Unless otherwise defined, including technical or scientific terms, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Terms as defined in commonly used dictionaries should be interpreted in a meaning consistent with their meaning in the context of the relevant art, and should not be construed as having an ideal or overly formal meaning unless explicitly defined in this application.

[0039] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0040] like Figures 1-4 As shown in the figure, the metal smelting vacuum powder spraying device proposed in this embodiment can be used for powder spraying in magnesium smelting, and can also be used for liquid spraying smelting of other metals.

[0041] This metal smelting vacuum powder spraying device is connected above the vacuum reaction chamber. It sprays powder into the molten pool within the chamber to initiate a chemical reaction, generating magnesium vapor. The magnesium vapor is then collected, completing the magnesium smelting process. A vacuum pump evacuates the chamber. Using this metal smelting vacuum powder spraying device, powder spraying can be completed automatically and continuously throughout the entire smelting process without breaking the vacuum. The spraying position can be adjusted as needed, resulting in high smelting efficiency.

[0042] This metal smelting vacuum powder spraying device includes a vacuum chamber 1, a powder spraying gun lifting mechanism 2 and a powder spraying gun 7 installed in the vacuum chamber 1.

[0043] Vacuum chamber 1 houses the powder spraying gun lifting mechanism 2 and the powder spraying gun 7, and is in vacuum communication with the reaction chamber below. The powder spraying gun 7 sprays powder into the molten pool in the reaction chamber under vacuum, ensuring a vacuum environment for the smelting process. The powder spraying gun lifting mechanism 2 drives the powder spraying gun 7 to move up and down within vacuum chamber 1, allowing it to enter and exit the reaction chamber. The powder spraying gun 7 contains powder material, which is sprayed into the molten pool to undergo a chemical reaction, producing magnesium vapor. The powder spraying gun 7 has a gas supply system to ensure a constant pressure of gas is emitted, thereby driving the powder material outwards.

[0044] The powder spray gun lifting mechanism 2 may include a steel support frame 21 that is installed from the bottom of the vacuum chamber 1 upwards, and a liftable trolley 3 is installed on the steel support frame 21.

[0045] Vacuum chamber 1 is a tall, vertical chamber. The bottom of steel support frame 21 is bolted to the bottom of vacuum chamber 1. The height of steel support frame 21 and vacuum chamber 1 can be determined according to the smelting conditions. There is a gap between the top of steel support frame 21 and vacuum chamber 1, which is sufficient to facilitate the fixing and operation of the upper components of steel support frame 21. The gap between the inner wall of vacuum chamber 1 and internal components such as steel support frame 21 is sufficient to facilitate the operation of components such as powder spraying gun 7. Vacuum chamber 1 with its inner wall close to internal components reduces the space of vacuum chamber 1, which can reduce the vacuuming time and facilitate disassembly and maintenance.

[0046] The trolley 3 can move up and down along the vertical steel support frame 21 so as to drive the powder spraying gun 7 to move vertically.

[0047] A vertically downward powder spraying gun 7 is installed on the trolley 3. The upper end of the powder spraying gun 7 is connected to one end of the powder inlet pipe 41 via a flange and bolts. The other end of the powder inlet pipe 41 passes through the side wall of the vacuum chamber 1 and connects to the powder hopper, and is equipped with a valve 43. A powder blowing device 44 facing the powder inlet pipe 41 is installed inside the powder hopper. The portion of the powder inlet pipe 41 located inside the vacuum chamber 1 is installed within the cable chain 42. The valve 43 and the powder blowing device 44 are both electrically controlled components. The powder inlet pipe 41, valve 43, powder hopper powder blowing device 44, and cable chain 42 together form the feeding mechanism 4.

[0048] The upper end of the 6m high powder spraying gun 7 is firmly installed on the trolley 3. When the trolley 3 is at its highest point, the lower end of the powder spraying gun 7 is located above the bottom outlet of the vacuum chamber 1. The trolley 3 can run along the steel support frame 21, so that the powder spraying gun 7 can move vertically and the lower end of the powder spraying gun 7 can extend into the molten pool below the surface of the reaction chamber.

[0049] To supply material to the powder spraying gun 7, the powder spraying gun 7 is connected to the powder inlet pipe 41. In order for the powder inlet pipe 41 to move with the moving powder spraying gun 7, the powder inlet pipe 41 is made of heat-resistant and wear-resistant flexible pipe, and the powder inlet pipe 41 can move when the powder spraying gun 7 moves up and down.

[0050] To facilitate material feeding, the powder inlet pipe 41 can extend through the side wall of the vacuum chamber 1. The powder inlet pipe 41 is sealed to the side wall. The extension position and the length of the powder inlet pipe 41 are determined according to the smelting conditions, ensuring that the powder inlet pipe 41 can move with the powder spraying gun 7. In this embodiment, the extension position can be set in the middle side wall of the vacuum chamber 1.

[0051] The powder inlet pipe 41 is connected to the powder silo, and the powder in the powder silo is supplied to the powder inlet pipe 41. The valve 43 is only opened when the powder is supplied.

[0052] The powder blowing device 44 can be an inert gas blowing device. The powder blowing device 44 blows inert gas into the powder inlet pipe 41, and the inert gas can carry the powder into the powder inlet pipe 41.

[0053] Once the powder spraying gun 7 reaches the appropriate position within the reaction chamber, when powder spraying is required, the control valve 43 opens, controlling the powder blowing device 44 to open, blowing the powder into the powder inlet pipe 41, and then spraying the powder through the powder spraying gun 7. The powder spraying gun 7 will continuously spray air during its descent to prevent molten metal from entering the gun, and the powder spraying operation will only be performed after it reaches the designated position.

[0054] The portion of the powder inlet pipe 41 located within the vacuum chamber 1 is situated within the central space of the drag chain 42. One end of the drag chain 42 is connected to the outer periphery of the upper port of the powder spraying gun 7 via a flange and bolts. The other end of the drag chain 42 is connected to the inner wall of the vacuum chamber at the inlet of the powder inlet pipe 41 via a flange and bolts. The guide groove of the drag chain 42 can be vertically positioned on the steel support frame 21 at a suitable location. The drag chain 42 can support the flexible powder inlet pipe 41, facilitating material feeding and ensuring that the powder inlet pipe 41 moves smoothly and stably with the powder spraying gun.

[0055] In one specific embodiment of this utility model, for the stable operation of the trolley 3, the steel support frame 21 includes a middle frame 211 and side frames 212 disposed on both sides of the middle frame 211. Vertical rails 22 are provided in the middle of the middle frame 211 and on the side frames 212, and limit baffles 23 are provided at both ends of the rails 22. The cross-section of the steel support frame 21 is U-shaped, and the rails 22 on the three inner sides of the U-shaped steel support frame 21 respectively can restrict the vertical and stable operation of the trolley 3. The limit baffles 23 at both ends of the rails 22 can prevent the trolley 3 from overshooting or bottoming out in the event of loss of control.

[0056] The trolley 3 runs on three tracks 22. The trolley 3 may include a middle frame 31. Upper frames 32 are vertically connected to the upper ends of one side of the middle frame 31, and lower frames 33 are vertically connected to the lower ends of the same side of the middle frame 31. Wheel mounting rods 35 are provided at the upper and lower ends of the other side of the middle frame 31, and wheels 36 adapted to the corresponding tracks 22 are provided on the wheel mounting rods 35.

[0057] The top and bottom ends of the trolley 3 are U-shaped frames, and the powder spraying gun 7 is fixed inside the U-shaped frame. Three wheels 36 are installed on the top and bottom ends of the back of the trolley 3 via wheel mounting rods 35. The three wheels 36 are installed in the middle and at both ends of the wheel mounting rods 35, respectively, corresponding one-to-one with the positions of the three tracks 22.

[0058] After the wheels 36 are installed with the corresponding tracks 22, the steel support frame 21 surrounds the back of the trolley 3, restricting its movement and preventing it from derailing, and ensuring stable operation within the steel support frame 21.

[0059] To ensure stable installation of the powder spraying gun 7, powder spraying gun fixing components 34 are provided between the two lower side frames 33 and the two upper side frames 32. The upper end of the powder spraying gun 7 is mounted on the two powder spraying gun fixing components 34 with a gap, which can ensure the verticality of the powder spraying gun 7.

[0060] Each wheel 36 has an axle that can be threaded through and rotatably connected to a wheel mounting rod 35. The wheel mounting rod 35 can be a cuboid, and the axles are perpendicular to the sides of the adjacent wheel mounting rods 35. The track 22 can be a grooved track formed on the steel support frame 21, with the two sides of the grooved track making rolling contact with the wheels 36 respectively.

[0061] Both the steel support frame 21 and the trolley 3 are made of high-strength, heat-resistant stainless steel.

[0062] In one specific embodiment of this utility model, in order to firmly fix the powder spraying gun 7, the powder spraying gun fixing component 34 may include an outer peripheral flange 341 fixed to the outer periphery of the powder spraying gun 7. A connecting flange 342 is bolted to the outer peripheral flange 341. Two hanging rods 343 are connected to the outer wall of the connecting flange 342. The two hanging rods 343 are on the same straight line as one diameter of the connecting flange 342. A first pin hole is provided on the hanging rod 343. The central axis of the first pin hole is parallel to the central axis of the connecting flange 342. Grooves are provided at the outer ends of the upper frame 32 and the lower frame 33. A vertical second pin hole is provided in the groove. The hanging rods 343 are respectively placed on the corresponding grooves and connected by pins 344 passing through the opposite first pin hole and second pin hole.

[0063] The outer flange 341, the connecting flange 342, and the two hanging rods 343 together form a set of powder spraying gun fixing components 34. The hanging rods 343 are connected to the groove by pins 344, which facilitates the removal of the powder spraying gun fixing components 34 and the powder spraying gun 7 from the trolley 3.

[0064] The outer flange 341 and the connecting flange 342 are fixed by bolts. When connecting the powder spraying gun fixing component 34 and the powder spraying gun 7, the connecting flange 342 can be inserted from both ends of the powder spraying gun 7 respectively.

[0065] In one specific embodiment of this utility model, in order to powerfully drive the trolley 3 to rise and fall, the powder spraying gun lifting mechanism 2 also includes a geared motor 24 disposed outside the vacuum chamber 1. The drive shaft of the geared motor 24 passes through the vacuum chamber 1 and is connected to the trolley 3 via a chain drive device, driving the trolley 3 and the powder spraying gun 7 to move along the track 22. The drive shaft is rotatably connected to the side wall of the vacuum chamber 1 through a first dynamic sealing device 27 to ensure sealing during rotation.

[0066] The geared motor 24, as the power mechanism, is located at the lower part outside the vacuum chamber 1, avoiding damage from the high temperature inside the vacuum chamber 1. Holes are provided on the side wall of the vacuum chamber 1, and the drive shaft passes through the holes to connect with the chain drive device. The chain drive device drives the trolley 3 to move up and down.

[0067] The chain drive device may include a sprocket assembly 25 connected to a drive shaft, on which a chain 26 meshes. The two ends of the chain 26 are connected to the upper and lower ends of the trolley 3, respectively. The sprocket assembly 25 may include a drive sprocket connected to the drive shaft, which drives a driven sprocket to rotate via the chain. The shaft of the driven sprocket is connected to a fixed plate mounted on a steel support frame 21. Two auxiliary sprockets are also mounted on the fixed plate, located above and below the driven sprocket, respectively. The midpoints of the two auxiliary sprockets and the driven sprocket form an isosceles triangle. The chain 26 passes through the gap between the two auxiliary sprockets and the driven sprocket and meshes with them. The two ends of the chain 26 pass over the support sprockets mounted at the upper and lower ends of the steel support frame 21, respectively, and are then connected to the upper and lower ends of the trolley 3. The portion of the chain 26 between the trolley 3 and the support sprockets is substantially vertical.

[0068] The first dynamic sealing device 27, which is set between the hole and the drive shaft of the geared motor 24, can ensure that external air does not enter the vacuum chamber 1.

[0069] In a specific embodiment of this utility model, in order to further ensure the safety of the trolley 3, a fall protection mechanism 5 is also provided, including a rotating motor 51 installed at the lower part of the exterior of the vacuum chamber 1. The rotating shaft of the rotating motor 51 passes through the side wall of the vacuum chamber 1 and is connected to the drum of the winch 52 installed at the lower part of the vacuum chamber 1. Two sets of steel wire ropes 53 are installed on the drum. The two sets of steel wire ropes 53 pass around the two sets of fixed pulleys 54 on the upper part of the steel support frame 21 and are connected to the upper ends of the trolley 3. Each set of fixed pulleys includes two fixed pulleys respectively installed on the two edges of the upper part of the steel support frame 21. The winch 52 and the trolley 3 operate synchronously in lifting and lowering. The rotating shaft is rotatably connected to the side wall of the vacuum chamber 1 through a second dynamic sealing device 55.

[0070] Two steel wire ropes 53 of the winch 52 balance and pull the two ends of the upper part of the trolley 3. The rotating motor 51 controls the operation of the winch 52 to be consistent with the operation of the trolley 3. To prevent the trolley 3 from suddenly losing control and falling during lifting and lowering, the speed of the winch 52 remains unchanged, which can hold the trolley 3 and continue to operate, preventing the trolley 3 from falling. With the two steel wire ropes 53 pulling, the trolley 3 is balanced. When the laser rangefinder detects that the trolley 3 has reached a suitable position, the rotating motor 51 stops rotating, and the smelting work is terminated for maintenance.

[0071] If the trolley 3 suddenly falls when it stops, the laser rangefinder detects that the position of the trolley 3 exceeds the expected value, or the load of the reduction motor decreases rapidly. The rotating motor 51 still controls the winch 52 to stop rotating, and the wire rope 53 can stably hold the trolley. The smelting work is terminated for maintenance.

[0072] The rotating motor 51 that provides power to the winch 52 is located at the lower part outside the vacuum chamber 1, avoiding damage from the high temperature inside the vacuum chamber 1. Holes are provided on the side wall of the vacuum chamber 1, and the rotating shaft passes through the holes to drive the drum of the winch 52 inside the vacuum chamber 1 to rotate, so that the wire rope 53 and the trolley 3 rise and fall synchronously.

[0073] The second dynamic sealing device 55, which is set between the hole and the rotating shaft of the motor 51, can ensure that external air does not enter the vacuum chamber 1.

[0074] The geared motor 24 and the rotary motor 51 are placed on the upper and lower layers of the two-layer support, respectively.

[0075] In one specific embodiment of this utility model, in order to form a connection channel 6 with the reaction chamber, a through hole is provided at the bottom of the vacuum chamber 1, a bellows 61 is connected to the through hole, a slide valve 62 is provided at the lower end of the bellows 61, a connecting pipe 63 connecting to the reaction chamber is provided below the slide valve 62, and a dust valve 64 is provided on the connecting pipe 63. The powder spraying gun 7 is directed towards the center of the bellows 61.

[0076] After the vacuum chamber 1 is connected to the reaction chamber, the two are connected by vacuum. The support on the reaction chamber supports the bottom of the heavy vacuum chamber 1. The connecting channel 6 formed by the bellows 61, the slide valve 62, the connecting pipe 63, and the dust valve 64 is connected to the reaction chamber.

[0077] The bellows 61 can compensate for the relative displacement caused by the temperature difference between the vacuum chamber 1 and the reaction vessel, increasing the sealing and flexibility of the connection between the two and ensuring safety.

[0078] The slide gate valve 62 can easily block the vacuum between the reaction chamber and the vacuum chamber 1 when needed, and the vacuum chamber 1 can be maintained and repaired separately.

[0079] The dust valve 64 is installed to prevent a large amount of smoke and dust generated during smelting from entering the vacuum chamber 1.

[0080] At the start of smelting, both the gate valve 62 and the dust valve 64 are open. The dust valve 64 can be closed after the powder injection gun 7 is inserted into the appropriate position in the reaction chamber. The dust valve 64 clamps the powder injection gun 7 in the middle, blocking the reaction chamber and the vacuum chamber 1. The outer end of the powder inlet pipe 41 begins to supply material. The inert gas carries the powder through the powder inlet pipe 41 and the powder injection gun 7, and finally sprays it out from the nozzle of the powder injection gun 7. The dust valve 64 can prevent a large amount of smoke and dust generated during smelting from entering the vacuum chamber 1.

[0081] After smelting, powder supply is stopped, dust valve 64 is opened, and reduction motor 24 reverses, driving trolley 3 upwards via chain drive. Once trolley 3 reaches its position, reduction motor 24 stops rotating. Gate valve 62 is closed to isolate the reaction vessel from vacuum chamber 1. The powder spraying gun 7 is cooled using compressed gas until it is detected to be within a safe temperature range. Vacuum chamber 1 can then be vented. The venting process must be strictly followed according to the operating procedures to balance the pressure difference inside and outside vacuum chamber 1. Once the pressure inside vacuum chamber 1 equals the external ambient pressure, maintenance and other work can be carried out to prepare for the next production operation.

[0082] In one specific embodiment of this utility model, the dust valve 64 may include a first valve plate 641 and a second valve plate 642 that are open in opposite directions. When the two valve plates are closed, they cover the cross-section of the connecting pipe 63 and have a circular hole in the middle. The powder spraying gun 7 is located in the circular hole and has a gap with the edge of the circular hole. The gap is sufficient to allow the powder spraying gun 7 to shake during the powder spraying process.

[0083] After the first valve plate 641 and the second valve plate 642 are closed, only the powder spraying gun 7 can pass through, which can minimize the rise of smoke and dust.

[0084] In a specific embodiment of this utility model, in order to facilitate the control of the powder spraying position of the powder spraying gun 7, a laser rangefinder 28 of the positive thrust trolley 3 is provided above the steel support frame 21. The laser rangefinder 28 is electrically connected to the encoder 241 of the geared motor 24.

[0085] The laser rangefinder 28 detects the position of the trolley 3 in real time and feeds the signal back to the outside of the vacuum chamber 1, thereby controlling the position of the trolley 3 and the position of the powder spraying gun 7.

[0086] The encoder 241 acquires the speed and rotation angle of the geared motor 24, and determines the chain elongation based on this, so as to calculate and control the position of the trolley 3, thereby controlling the powder spraying position of the powder spraying gun 7.

[0087] The laser rangefinder 28 and encoder 241 simultaneously collect data, and can combine their data to determine the position of the trolley 3 in a vacuum environment with some smoke and dust and unclear high temperature. In the vacuum chamber 1, the laser rangefinder 28 and encoder 241 simultaneously obtain the powder spraying position of the powder spraying gun 7 for closed-loop control, dynamically adjust the position of the powder spraying gun, and control the rotation of the reduction motor 24 to achieve the appropriate position.

[0088] The powder spraying position of the powder spraying gun 7 can be controlled in the lower half of the molten pool. Since the powder spraying gun 7 will continuously spray powder and gas, the sprayed gas forms a strong airflow in the molten liquid. This airflow can drive the molten liquid to roll. The rolling of the molten liquid makes the internal substances mix more thoroughly, increases the contact area between reactants, and makes the chemical reaction more intense, which is beneficial to improving the efficiency and quality of smelting.

[0089] After smelting is completed, the reduction motor 24 reverses, and the trolley 3 rises to the highest point.

[0090] In one specific embodiment of this utility model, to reduce vacuuming, the vacuum chamber 1 includes a cylindrical vacuum chamber 11 and a box-shaped vacuum chamber 12 connected vertically, and the box-shaped vacuum chamber 12 and the cylindrical vacuum chamber 11 are connected by a flange and bolts. The cross-sectional area of ​​the cylindrical vacuum chamber 11 is smaller than that of the box-shaped vacuum chamber 12, and one side wall of the cylindrical vacuum chamber 11 is aligned with one side wall of the box-shaped vacuum chamber 12. Both the cylindrical vacuum chamber 11 and the box-shaped vacuum chamber 12 are made of high-strength carbon steel.

[0091] A cylindrical vacuum chamber 11 with a slightly smaller cross-sectional area is connected above a box-shaped vacuum chamber 12, which can reduce the overall space of the vacuum chamber 1, reduce the vacuuming time, and facilitate subsequent maintenance.

[0092] In one specific embodiment of this utility model, in order to protect components such as the steel support frame 21 from the heat radiation of the powder spraying gun 7, a heat control coating is applied to the side of the steel support frame 21 facing the powder spraying gun 7 and the surface of important components.

[0093] During use, the powder spray gun 7 is inserted into the molten reaction solution for a long time. After the smelting is finished, it is lifted into the vacuum chamber 1. The temperature is thousands of degrees. At the same time, the graphite material of the powder spray gun 7 has a high specific heat. In the vacuum environment, it will radiate heat to the surrounding steel support frame 21 and other components. If the steel temperature is too high, the mechanical properties will decrease, and it may bend, break, become unstable, or collapse.

[0094] The thermal control coating can be a low-absorption, low-emissivity thermal control coating to reduce the thermal radiation absorbed by the steel support frame 21.

[0095] A water cooling system is also installed on the outer wall of vacuum chamber 1 to absorb the heat on the outer wall of vacuum chamber 1, ensuring equipment safety and improving service life.

[0096] The water cooling system may include a water tank and water pipes located outside the vacuum chamber 1, with the water pipes attached to the outer wall of the vacuum chamber 1. Water from the water tank is drawn into the water pipes to cool the outer wall of the vacuum chamber 1, and the hot water in the water pipes flows to an external cooling tower for collection and cooling.

[0097] This utility model provides a set of efficient, highly automated, widely applicable and safe vacuum powder spraying device for non-ferrous metal smelting, which can realize continuous powder spraying and adjustable powder spraying position throughout the entire process of magnesium smelting liquid spraying method.

[0098] The metal smelting vacuum powder spraying apparatus according to the present invention has been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the metal smelting vacuum powder spraying apparatus proposed in the present invention without departing from the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A vacuum powder spraying device for metal smelting, characterized in that, Includes a vacuum chamber, a powder spraying gun lifting mechanism disposed within the vacuum chamber, and a powder spraying gun, wherein, The powder spray gun lifting mechanism includes a steel support frame that is installed from the bottom of the vacuum chamber upwards, and a liftable trolley is installed on the steel support frame; A vertically downward powder spraying gun is installed on the trolley. The upper end of the powder spraying gun is connected to one end of the powder inlet pipe. The other end of the powder inlet pipe passes through the side wall of the vacuum chamber and is connected to the powder hopper. A valve is provided. A powder blowing device facing the powder inlet pipe is provided in the powder hopper. The part of the powder inlet pipe located in the vacuum chamber is set in the cable chain. The trolley lowers the powder spraying gun so that it extends out of the bottom of the vacuum chamber and enters the vacuum reaction chamber connected to the vacuum chamber. After the valve is opened, the powder blowing device feeds the powder into the powder inlet pipe, and the powder spraying gun sprays powder at the same time.

2. The vacuum powder spraying device for metal smelting as described in claim 1, characterized in that, The steel support frame includes a middle frame and side frames arranged on both sides of the middle frame. Vertical rails are provided in the middle of the middle frame and on the side frames, and limit baffles are provided at both ends of the rails. The trolley includes a middle frame, with upper frames vertically connected to the upper ends of one side of the middle frame, and lower frames vertically connected to the lower ends of the side. A powder spraying gun fixing component is provided between the two lower frames and the two upper frames. Wheel mounting rods are respectively provided at the upper and lower ends of the other side of the intermediate frame, and wheels adapted to the corresponding tracks are provided on the wheel mounting rods. The trolley is housed within the steel support frame, and the wheels are mounted on corresponding tracks.

3. The vacuum powder spraying device for metal smelting as described in claim 2, characterized in that, The powder spraying gun fixing component includes an outer peripheral flange fixed to the outer periphery of the powder spraying gun, a connecting flange connected to the outer peripheral flange by bolts, two hanging rods connected to the outer wall of the connecting flange, the two hanging rods being on the same straight line as one diameter of the connecting flange, and a first pin hole provided on the hanging rod, the central axis of the first pin hole being parallel to the central axis of the connecting flange. Grooves are provided at the outer ends of both the upper and lower vehicle frames, and vertical second pin holes are provided in the grooves. The hanging rods are respectively placed in the corresponding grooves and connected by pins passing through the first and second pin holes that are directly opposite each other.

4. The vacuum powder spraying device for metal smelting as described in claim 1, characterized in that, The powder spray gun lifting mechanism also includes a reduction motor disposed outside the vacuum chamber. The drive shaft of the reduction motor passes through the side wall of the vacuum chamber and is connected to a sprocket assembly. A chain is meshed on the sprocket assembly, and the two ends of the chain are respectively connected to the upper and lower ends of the trolley. The drive shaft is rotatably connected to the side wall of the vacuum chamber via a first dynamic sealing device.

5. The vacuum powder spraying apparatus for metal smelting as described in claim 4, characterized in that, A laser rangefinder that faces the trolley is installed above the steel support frame, and an encoder is installed on the geared motor.

6. The vacuum powder spraying apparatus for metal smelting as described in claim 1, characterized in that, It also includes a fall protection mechanism, which includes a rotating motor installed below the outside of the vacuum chamber. The rotating motor's shaft passes through the side wall of the vacuum chamber and is connected to the drum of a winch installed at the bottom of the vacuum chamber. Two sets of steel wire ropes are installed on the drum. The two sets of steel wire ropes pass around two sets of fixed pulleys on the upper part of the steel support frame and are connected to the upper ends of the trolley. The winch and the trolley operate synchronously in lifting and lowering. The rotating shaft is rotatably connected to the side wall of the vacuum chamber via a second dynamic sealing device.

7. The vacuum powder spraying apparatus for metal smelting as described in claim 1, characterized in that, A bellows is connected to the bottom of the vacuum chamber, a slide valve is provided at the lower end of the bellows, a connecting pipe connected to the reaction chamber is provided below the slide valve, and a dust valve is provided on the connecting pipe. The powder spraying gun is aimed directly at the center of the bellows.

8. The vacuum powder spraying apparatus for metal smelting as described in claim 7, characterized in that, The dust-blocking valve includes a first valve plate and a second valve plate that are open in opposite directions. When the first valve plate and the second valve are closed, they cover the cross-section of the connecting pipe and have a circular hole in the middle. The powder spraying gun is located in the circular hole.

9. The vacuum powder spraying apparatus for metal smelting as described in claim 1, characterized in that, The vacuum chamber includes a cylindrical vacuum chamber and a box-shaped vacuum chamber connected vertically. The box-shaped vacuum chamber and the cylindrical vacuum chamber are connected by a flange and bolts. The cross-sectional area of ​​the cylindrical vacuum chamber is smaller than that of the box-shaped vacuum chamber. One side wall of the cylindrical vacuum chamber is aligned with one side wall of the box-shaped vacuum chamber.

10. The vacuum powder spraying apparatus for metal smelting as described in claim 1, characterized in that, A thermal control coating is applied to the side of the steel support frame facing the powder spray gun, and a water cooling system is provided on the outer wall of the vacuum chamber.

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