Metal smelting vacuum powder spraying device and using method thereof

Abstract

The invention provides a metal smelting vacuum powder spraying device and a using method thereof.The device 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 liftable 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 penetrates out of the side wall of the vacuum chamber and is connected to a powder bin, and the part, located in the vacuum chamber, of the powder inlet pipe is arranged in a drag chain. A connecting channel is arranged at the bottom of the vacuum chamber, the connecting channel is communicated with the reaction chamber, and the powder spraying gun positively rushes the center of the connecting channel. Continuous feeding and powder spraying can be achieved in the 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] The present invention relates to the technical field of metal smelting equipment, and more specifically, to a metal smelting vacuum powder spraying device and a use method thereof. Background Art

[0002] Magnesium metal is the eighth most abundant element in the earth's crust. It is a lightweight metal with excellent physical and chemical properties, such as low density, high strength-to-weight ratio, good thermal conductivity and electrical conductivity. Magnesium exists mainly in the form of minerals in nature, such as magnesite, dolomite and seawater, which are rich in magnesium ions. Currently, magnesium and magnesium alloys are used in many fields, including aerospace, automobiles, electronic products, and basic building materials. With the advancement of energy-saving 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] There are two main methods for producing magnesium metal: electrolysis: extracting magnesium from seawater to obtain pure magnesium; thermal reduction: using magnesite or dolomite as raw materials to extract magnesium through high-temperature reduction reactions. The thermal reduction method is mainly divided into the Pijiang method, the vertical tank internal heat method, and the liquid injection method.

[0004] The powder spraying device is very important for the liquid spraying method of magnesium smelting. The powder spraying device has an important influence on improving the thermal reduction efficiency of the liquid spraying method, the stability of the powder spraying, and the maintenance frequency. However, the feeding method of the existing metal smelting powder spraying device is non-continuous feeding. When feeding the powder spraying gun, it is necessary to feed manually, which cannot achieve continuous powder spraying and continuous production, resulting in the actual reaction rate being far lower than the maximum rate at which the molten pool can react, resulting in low smelting efficiency; furthermore, when the traditional powder spraying device is used for powder spraying during the smelting process, the powder spraying position is mostly on the surface of the molten pool, and the powder spraying position cannot be adjusted, and the reaction position is not ideal, which makes the reaction rate relatively slow and the reaction is not sufficient, resulting in a low smelting efficiency. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a metal smelting vacuum powder spraying device and a method of using the same, which can realize continuous feeding and powder spraying under a vacuum state, and the powder spraying position of the powder spraying gun can be adjusted to ensure that the powder is sprayed out at an ideal liquid level height for reaction, thereby improving the smelting efficiency and the stability of the smelting reaction.

[0006] The present invention provides a metal smelting vacuum powder spraying device, comprising a vacuum chamber, a powder spraying gun lifting mechanism and a powder spraying gun arranged in the vacuum chamber, wherein:

[0007] The powder spray gun lifting mechanism comprises a steel support frame arranged upward from the bottom of the vacuum chamber, and a liftable trolley is arranged on the steel support frame;

[0008] A powder spray gun is mounted vertically downward on the trolley, the upper end of the powder spray gun is connected to one end of a powder inlet pipe, the other end of the powder inlet pipe passes through the side wall of the vacuum chamber and is connected to a powder bin, and the part of the powder inlet pipe located in the vacuum chamber is arranged in the drag chain;

[0009] A connecting channel is arranged at the bottom of the vacuum chamber, the connecting channel is communicated with the reaction chamber, and the powder spraying gun is directed toward the center of the connecting channel.

[0010] The steel support frame includes an intermediate frame and side frames arranged on both sides of the intermediate frame, vertical tracks are arranged in the middle of the intermediate frame and on the side frames, and limit baffles are arranged at both ends of the tracks; the trolley includes an intermediate frame, upper frames are vertically connected to the upper ends of one side surface of the intermediate frame, lower frames are vertically connected to the lower ends of the side surfaces, and powder gun fixing components are arranged between the two lower frames and the two upper frames; wheel mounting rods are respectively arranged at the upper and lower ends of the other side surface of the intermediate frame, and wheels respectively adapted to the corresponding tracks are arranged on the wheel mounting rods; the trolley is arranged in the steel support frame, and the wheels are arranged on the corresponding tracks.

[0011] The powder gun fixing component includes a peripheral flange fixed to the outer periphery of the powder gun, a connecting flange is connected to the peripheral flange by bolts, two hanging rods are connected to the outer wall of the connecting flange, the two hanging rods are on the same straight line with a diameter of the connecting flange, a first pin hole is arranged on the hanging rod, and the center axis of the first pin hole is parallel to the center axis of the connecting flange; grooves are arranged at the outer ends of the upper frame and the lower frame, and a vertical second pin hole is arranged in the groove; the hanging rods are respectively placed in the corresponding grooves and are connected by pin shafts passing through the first pin hole and the second pin hole facing each other.

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

[0013] A laser rangefinder facing the trolley is arranged above the steel support frame, and an encoder is arranged on the reduction motor.

[0014] It also includes an anti-falling mechanism, which includes a rotating motor arranged at the lower part of the outside of the vacuum chamber, the rotating shaft of the rotating motor penetrates the side wall of the vacuum chamber, and is connected to the drum of a winch arranged at the lower part of the vacuum chamber, two groups of steel wire ropes are arranged on the drum, the two groups of steel wire ropes are respectively passed around the two groups of fixed pulleys on the upper part of the steel support frame and connected to the upper two ends of the trolley, the winch and the lifting of the trolley are synchronously operated; the rotating shaft is rotatably connected to the side wall of the vacuum chamber through a second dynamic sealing device.

[0015] The connecting channel includes a bellows connected to the bottom of the vacuum chamber, a gate valve is arranged at the lower end of the bellows, a connecting pipe is arranged below the gate valve, a dust blocking valve is arranged on the connecting pipe, and the connecting pipe is connected to the powder spray gun mounting sleeve on the reaction chamber.

[0016] The dust-blocking valve comprises a first valve plate and a second valve plate which are separated from each other. When the first valve plate and the second valve plate are closed, they cover the cross section of the connecting pipe and have a circular hole in the middle. The powder spray gun is located in the circular hole.

[0017] The vacuum chamber comprises a cylindrical vacuum chamber and a box-type vacuum chamber connected up and down, the box-type 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 the cross-sectional area of ​​the box-type vacuum chamber, and one side wall of the cylindrical vacuum chamber is aligned with one side wall of the box-type vacuum chamber; a ring plate is arranged around the bottom of the box-type vacuum chamber, and the powder spray gun bracket on the reaction chamber is supported below the ring plate.

[0018] Another aspect of the present invention provides a method for using a metal smelting vacuum powder spraying device, which uses the metal smelting vacuum powder spraying device to perform powder spraying, comprising the following steps:

[0019] S1: hoisting the box-type vacuum chamber above the reaction chamber, and connecting the connecting channel with the powder spray gun mounting sleeve on the reaction chamber, the powder spray gun bracket on the reaction chamber supports the ring plate at the bottom of the box-type vacuum chamber, installing the powder spray gun lifting component, the powder spray gun and the powder inlet pipe in the box-type vacuum chamber, installing the cylindrical vacuum chamber on the upper part of the box-type vacuum chamber, and the side wall of the cylindrical vacuum chamber is connected with the powder inlet pipe;

[0020] S2: evacuate the vacuum chamber and open the gate valve;

[0021] S3: controlling the reduction motor to make the trolley descend along the steel support frame to drive the powder spray gun to pass through the connecting channel and enter the reaction chamber;

[0022] S4: After the powder spray gun is in place, the dust blocking valve is closed, and the powder bin continues to supply material to the powder inlet pipe, so that the powder spray gun continues to spray powder.

[0023] From the above description, it can be seen that the metal smelting vacuum powder spraying device and its use method provided by the present invention, the powder spraying gun is firmly installed on the upper part of the reaction chamber, connected to the external powder bin through a hose, can automatically feed, dynamically adjust the lifting trolley to control the powder spraying position of the powder spraying gun, and automatically open and close the gate valve and dust valve according to the working conditions and the position of the powder spraying gun. The present invention realizes automatic feeding and continuous powder spraying in the entire smelting process, the powder spraying position can be adjusted, the smelting process is uninterrupted, the smelting efficiency is high, the equipment adaptability is high, automatic powder spraying is realized, and labor costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0025] Figure 1 This is a schematic structural diagram of a metal smelting vacuum powder spraying device according to Example 1 of the present invention;

[0026] Figure 2 A side view of a lifting mechanism for a powder spray gun according to Embodiment 1 of the present invention;

[0027] Figure 3 for Figure 1 AA view;

[0028] Figure 4 for Figure 1 BB view;

[0029] Figure 5 This is a flow chart of a method for using a metal smelting vacuum powder spraying device according to Example 2 of the present invention;

[0030] Among them, 1-vacuum chamber, 11-cylindrical vacuum chamber, 12-box-type vacuum chamber, 13-ring plate;

[0031] 2-powder spray gun lifting mechanism, 21-steel support frame, 211-intermediate frame, 212-side frame, 22-track, 23-limit baffle, 24-reduction motor, 241-encoder, 25-sprocket assembly, 251-driving sprocket, 252-support sprocket, 26-chain, 27-first dynamic sealing device, 28-laser rangefinder;

[0032] 3-trolley, 31-middle frame, 32-upper frame, 33-lower frame, 34-powder spray gun fixing member, 341-peripheral flange, 342-connecting flange, 343-hanging rod, 344-pin shaft, 35-wheel mounting rod, 36-wheel;

[0033] 4-feeding mechanism, 41-powder feeding pipe, 42-drag chain, 43-valve, 44-powder blowing device;

[0034] 5-anti-fall mechanism, 51-rotating motor, 52-winding machine, 53-wire rope, 54-fixed pulley, 55-second dynamic sealing device;

[0035] 6-connecting channel, 61-bellows, 62-gate valve, 63-connecting pipe, 64-dust valve, 641-first valve plate, 642-second valve plate;

[0036] 7- Powder spray gun;

[0037] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0038] The present invention can be subjected to various changes and can have various embodiments, and specific embodiments are illustrated and described in the accompanying drawings. However, the present invention is not limited to the specific implementation, and all changes, equivalents and substitutes falling within the concept and technical scope of the present invention are included, and should be understood to be included.

[0039] Ordinal terms such as first, second, etc. may be used to describe various constituent elements, but the constituent elements are not limited to the terms. The terms are only used to distinguish one constituent element from another constituent element. For example, without departing from the scope of the claims of the present invention, the second constituent element may be named as the first constituent element, and similarly, the first constituent element may be named as the second constituent element. The terms and / or include a combination of multiple associated items or a certain item among multiple associated items.

[0040] It should be understood that when a certain component is mentioned to be "connected" or "contacted" with other components, this includes not only the case where it is directly connected or contacted with other components, but also the case where other components exist in between. Conversely, when a certain component is mentioned to be "directly connected" or "directly contacted" with other components, it should be understood that there are no other components in between.

[0041] In the description of the embodiments, when it is described that a certain component is formed "on or under" another component, on or under includes two components directly contacting each other or at least one other component is arranged and formed between the two components. Moreover, when it is expressed as on or under, it refers to not only the upper direction but also the lower direction based on a certain component.

[0042] The terms used in this application are only used to illustrate specific embodiments and are not intended to limit the present invention. Unless the context clearly provides otherwise, singular expressions include plural expressions. In this application, it should be understood that terms such as "including" or "having" are used to specify the presence of features, numbers, steps, operations, constituent elements, parts or combinations thereof recorded in the specification, and do not preclude the presence or additional possibility of one or more other features, numbers, steps, operations, constituent elements, parts or combinations thereof.

[0043] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by those skilled in the art. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as in the context of the relevant technology, and if not clearly defined in this application, they should not be interpreted as ideal or overly formal meanings.

[0044] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Example 1

[0046] like Figure 1-Figure 4 As shown together, 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 blowing smelting of other metals.

[0047] The metal smelting vacuum powder spraying device is connected above the vacuum reaction chamber, sprays powder into the molten pool in the reaction chamber for chemical reaction, generates magnesium vapor, and collects the magnesium vapor to complete the magnesium smelting. The chamber is evacuated by a vacuum pump. The metal smelting vacuum powder spraying device can automatically and continuously complete the powder spraying in the entire smelting process without destroying the vacuum, and the powder spraying position can be adjusted as needed, with high smelting efficiency.

[0048] The metal smelting vacuum powder spraying device comprises a vacuum chamber 1 , a powder spraying gun lifting mechanism 2 and a powder spraying gun 7 which are arranged in the vacuum chamber 1 .

[0049] The vacuum chamber 1 is used to place the powder gun lifting mechanism 2 and the powder gun 7, and is connected to the reaction chamber below by vacuum. The powder gun 7 sprays powder into the molten pool in the reaction chamber in a vacuum environment to ensure the vacuum environment of the smelting process; the powder gun lifting mechanism 2 is used to drive the powder gun 7 to move up and down in the vacuum chamber 1 so as to enter and withdraw from the reaction chamber; the powder gun 7 is filled with powder and is used to spray powder into the molten pool to perform chemical reactions and obtain magnesium vapor. The powder gun 7 has an air supply system to ensure that the powder gun 7 always has a certain pressure gas sprayed out, thereby driving the powder to spray out.

[0050] The powder spray gun lifting mechanism 2 may include a steel support frame 21 arranged upward from the bottom of the vacuum chamber 1 , and a liftable trolley 3 is arranged on the steel support frame 21 .

[0051] The vacuum chamber 1 is a vertically tall chamber, and the bottom of the steel support frame 21 is installed at the bottom of the vacuum chamber 1 by bolts. The height of the steel support frame 21 and the vacuum chamber 1 can be determined according to the smelting conditions. There is a distance between the steel support frame 21 and the top of the vacuum chamber 1, and the distance is convenient for the fixing and operation of the upper end parts of the steel support frame 21; the distance between the inner wall of the vacuum chamber 1 and the internal steel support frame 21 and other parts is convenient for the operation of the powder spraying gun 7 and other parts. The vacuum chamber 1 with the inner wall close to the internal parts reduces the space of the vacuum chamber 1, can reduce the vacuum pumping time, and is easy to disassemble and repair.

[0052] 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.

[0053] A powder spray gun 7 is mounted vertically downward on the trolley 3. The upper end of the powder spray gun 7 is connected to one end of a powder inlet pipe 41 through a flange and bolts. The other end of the powder inlet pipe 41 passes through the side wall of the vacuum chamber 1 and is connected to the powder bin. The part of the powder inlet pipe 41 located in the vacuum chamber 1 is arranged in the drag chain 42.

[0054] The end of the powder inlet pipe 41 outside the vacuum chamber 1 can be connected to the powder bin through a pipeline, and a valve is provided on the pipeline, and a powder blowing device 44 is provided in the powder bin toward the pipeline. The valve 43 and the powder blowing device 44 are both electronically controlled components. The powder inlet pipe 41, the valve 43, the powder bin powder blowing device 44, and the drag chain 42 together form a feeding mechanism 4.

[0055] The upper end of the powder spray gun 7, which is as high as 6m, is firmly installed on the trolley 3. When the trolley 3 is at the highest point, the lower end of the powder spray 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 spray gun 7 moves vertically, so that the lower end of the powder spray gun 7 can extend below the molten pool liquid level in the reaction chamber.

[0056] In order to feed the powder spray gun 7, the powder spray gun 7 is connected to the powder feeding pipe 41. In order to allow the powder feeding pipe 41 to move with the moving powder spray gun 7, the powder feeding pipe 41 is a heat-resistant and wear-resistant flexible pipe, and when the powder spray gun 7 moves up and down, the powder feeding pipe 41 is movable.

[0057] In order to facilitate feeding, the powder inlet pipe 41 can pass through the side wall of the vacuum chamber 1, and the powder inlet pipe 41 and the side wall are sealed. The passing position and the length of the powder inlet pipe 41 are determined according to the smelting conditions to ensure that the powder inlet pipe 41 can move with the powder spraying gun 7. In this embodiment, the passing position can be set on the middle side wall of the vacuum chamber 1.

[0058] The powder inlet pipe 41 is connected to the powder bin, and the powder in the powder bin is supplied to the powder inlet pipe 41 . The valve 43 is opened only when supplying powder.

[0059] The powder blowing device 44 may be an inert gas blowing device. The powder blowing device 44 blows inert gas into the powder inlet pipe 41 , and the inert gas may bring powder into the powder inlet pipe 41 .

[0060] After the powder spraying gun 7 reaches a suitable position in the reaction chamber, when powder spraying is required, the control valve 43 is opened, the powder blowing device 44 is controlled to be opened, and the powder is blown into the powder inlet pipe 41, and the powder is sprayed by the powder spraying gun 7. The powder spraying gun 7 will continue to spray during the descent to prevent the melt from entering the gun, and the powder spraying operation will be performed after reaching the designated position.

[0061] The part of the powder inlet pipe 41 located in the vacuum chamber 1 is arranged in the middle 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 spray gun 7 through a flange and bolts, and the other end of the drag chain 42 is connected to the inner wall of the vacuum chamber at the opening of the powder inlet pipe 41 through a flange and bolts, and the guide groove of the drag chain 42 can be vertically arranged at a suitable position on the steel support frame 21. The drag chain 42 can support the flexible powder inlet pipe 41, which is convenient for feeding, and allows the powder inlet pipe 41 to smoothly and stably follow the movement of the powder spray gun.

[0062] In order to stabilize the vacuum through the reaction chamber, a connecting channel 6 is provided at the bottom of the vacuum chamber 1 , the connecting channel 6 is communicated with the reaction chamber, and the powder spraying gun 7 is directed toward the center of the connecting channel 6 .

[0063] In a specific embodiment of the present invention, for the stable operation of the trolley 3, the steel support frame 21 includes an intermediate frame 211 and side frames 212 arranged on both sides of the intermediate frame 211, and vertical tracks 22 are arranged in the middle of the intermediate frame 211 and on the side frames 212, and limit baffles 23 are arranged at both ends of the tracks 22. The cross section of the steel support frame 21 is U-shaped, and the tracks 22 are arranged on the three inner sides of the U-shaped steel support frame 21, which can limit the vertical stable operation of the trolley 3. The limit baffles 23 at both ends of the track 22 can prevent the trolley 3 from rushing to the top or squatting to the bottom in the case of loss of control.

[0064] The trolley 3 runs on three tracks 22, and may include an intermediate frame 31, with upper frames 32 vertically connected to both sides of the upper end of one side of the intermediate frame 31, and lower frames 33 vertically connected to both sides of the lower end of this side of the intermediate frame 31, and wheel mounting rods 35 are respectively provided at the upper and lower ends of the other side of the intermediate frame 31, and wheels 36 respectively adapted to the corresponding tracks 22 are provided on the wheel mounting rods 35.

[0065] The upper and lower ends of the trolley 3 are U-shaped frames, and the powder spray gun 7 is fixed in the U-shaped frame. Three wheels 36 are installed at the upper and lower ends of the back of the trolley 3 through wheel mounting rods 35, and the three wheels 36 are respectively installed in the middle and both ends of the wheel mounting rod 35, corresponding to the positions of the three tracks 22 one by one.

[0066] After the wheels 36 are respectively installed with the corresponding tracks 22, the steel support frame 21 surrounds the back of the trolley 3 to limit the displacement of the trolley 3 and prevent it from derailing, and it runs stably in the steel support frame 21.

[0067] In order to stably install the powder gun 7, a powder gun fixing member 34 is provided between the two lower frames 33 and the two upper frames 32. The upper end of the powder gun 7 is mounted on two powder gun fixing members 34 with a spacing, which can ensure the verticality of the powder gun 7.

[0068] The axle of each wheel 36 can be passed through and rotatably connected to the wheel mounting rod 35, and the wheel mounting rod 35 can be a rectangular parallelepiped, and the axles are perpendicular to the side of the adjacent wheel mounting rod 35. The track 22 can be a groove track opened on the steel support frame 21, and the two sides of the groove track are respectively in rolling contact with the wheels 36.

[0069] The steel support frame 21 and the trolley 3 are both made of high-strength heat-resistant stainless steel.

[0070] In a specific embodiment of the present invention, in order to firmly fix the powder gun 7, the powder gun fixing component 34 may include a peripheral flange 341 fixed to the outer periphery of the powder gun 7, and a connecting flange 342 is connected to the peripheral flange 341 by bolts. Two hanging rods 343 are connected to the outer wall of the connecting flange 342, and the two hanging rods 343 are on the same straight line with a diameter of the connecting flange 342. A first pin hole is arranged on the hanging rod 343, and the central axis of the first pin hole is parallel to the central axis of the connecting flange 342; grooves are arranged at the outer ends of the upper frame 32 and the lower frame 33, and a vertical second pin hole is arranged in the groove; the hanging rods 343 are respectively placed on the corresponding grooves and are connected by pin shafts 344 passing through the first pin hole and the second pin hole facing each other.

[0071] The peripheral flange 341, the connecting flange 342 and the two hanging rods 343 together form a set of powder gun fixing components 34. The hanging rod 343 is connected to the groove through a pin 344, which is convenient for removing the combination of the powder gun fixing component 34 and the powder gun 7 from the trolley 3.

[0072] The outer peripheral flange 341 and the connecting flange 342 are fixed by bolts. When the powder spray gun fixing component 34 and the powder spray gun 7 are connected, the connecting flange 342 can be inserted from both ends of the powder spray gun 7 respectively.

[0073] In a specific embodiment of the present invention, in order to effectively drive the trolley 3 to rise and fall, the powder gun lifting mechanism 2 further includes a reduction motor 24 disposed outside the vacuum chamber 1, and the transmission shaft of the reduction motor 24 penetrates the vacuum chamber 1 and is connected to the trolley 3 through a chain drive device, driving the trolley 3 and the powder gun 7 to move along the track 22. The transmission 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.

[0074] The reduction motor 24 as a power mechanism is located at the lower part outside the vacuum chamber 1 to avoid damage caused by high temperature in the vacuum chamber 1. Holes are set on the side wall of the vacuum chamber 1, and the transmission shaft passes through the holes to connect with the chain transmission device, which drives the trolley 3 to move up and down.

[0075] The chain transmission device may include a sprocket assembly 25 connected to the transmission shaft, a chain 26 is meshed on the sprocket assembly 25, and two ends of the chain 26 are respectively connected to the upper and lower ends of the trolley 3. The sprocket assembly 25 may include a driving sprocket connected to the transmission shaft, the driving sprocket drives the driven sprocket to rotate through the chain, the shaft of the driven sprocket is connected to a fixed plate arranged on the steel support frame 21, and two auxiliary sprockets are also arranged on the fixed plate, the two auxiliary sprockets are respectively located above and below the driven sprocket, and 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 respectively bypass the support sprockets arranged at the upper and lower ends of the steel support frame 21, and then connected to the upper and lower ends of the trolley 3, and the part of the chain 26 between the trolley 3 and the support sprocket is basically vertical.

[0076] The first dynamic sealing device 27 disposed between the hole and the transmission shaft of the reduction motor 24 can ensure that external air does not enter the vacuum chamber 1 .

[0077] In a specific embodiment of the present invention, in order to further ensure the safety of the trolley 3, an anti-fall mechanism 5 is also provided, including a rotating motor 51 arranged at the lower outer part of the vacuum chamber 1, the rotating shaft of the rotating motor 51 penetrates the side wall of the vacuum chamber 1, and is connected to the drum of a winch 52 arranged at the lower part of the vacuum chamber 1, and two groups of steel wire ropes 53 are arranged on the drum, and the two groups of steel wire ropes 53 are respectively passed around the two groups of fixed pulleys 54 on the upper part of the steel support frame 21 and connected to the upper two ends of the trolley 3, and the two groups of fixed pulleys include two fixed pulleys respectively arranged at the two edges of the upper part of the steel support frame 21, and the winch 52 is synchronously operated with the lifting and lowering of the trolley 3; the rotating shaft is rotatably connected to the side wall of the vacuum chamber 1 through a second dynamic sealing device 55.

[0078] The two steel wire ropes 53 of the hoist 52 pull the two ends of the upper part of the trolley 3 in a balanced manner, and the rotating motor 51 controls the operation of the hoist 52 to be consistent with the operation of the trolley 3. In order to prevent the trolley 3 from falling out of control suddenly when it is raised or lowered, the speed of the hoist 52 remains unchanged, and the trolley 3 can be pulled and continued to run to prevent the trolley 3 from falling. The two steel wire ropes 53 pull the trolley 3 to balance, and the laser rangefinder detects that the trolley 3 has reached a suitable position, and the rotating motor 51 stops rotating, and the smelting work is terminated for maintenance.

[0079] 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, the wire rope 53 can stably hold the trolley, and the smelting work is terminated for maintenance.

[0080] The rotating motor 51 that provides power for the winch 52 is located at the lower part outside the vacuum chamber 1 to avoid damage caused by high temperature in the vacuum chamber 1. A hole is set on the side wall of the vacuum chamber 1, and the rotating shaft passes through the hole to drive the drum of the winch 52 in the vacuum chamber 1 to rotate, so that the wire rope 53 and the trolley 3 rise and fall synchronously.

[0081] The second dynamic sealing device 55 provided between the hole and the rotating shaft of the rotating motor 51 can ensure that external air does not enter the vacuum chamber 1 .

[0082] The reduction motor 24 and the rotary motor 51 are respectively placed on the upper and lower layers of the two-layer bracket.

[0083] In a specific embodiment of the present invention, the connecting channel 6 may include a through hole provided at the bottom of the vacuum chamber 1, a bellows 61 is connected to the through hole, a gate valve 62 is provided at the lower end of the bellows 61, a connecting pipe 63 connected to the reaction chamber is provided below the gate valve 62, and a dust blocking valve 64 is provided on the connecting pipe 63. The powder spray gun 7 is directed at the center of the bellows 61.

[0084] When the vacuum chamber 1 is connected to the reaction chamber, the two are connected by vacuum, and the powder spray gun support on the reaction chamber supports the bottom of the heavy vacuum chamber 1. The connecting channel 6 formed by the bellows 61, the gate valve 62, the connecting pipe 63, and the dust blocking valve 64 is connected to the reaction chamber.

[0085] The bellows 61 can compensate for the relative displacement caused by the different temperatures in the vacuum chamber 1 and the reaction container, thereby increasing the sealing and flexibility of the connection between the two and ensuring safety.

[0086] The gate valve 62 is convenient for blocking the vacuum of the reaction chamber and the vacuum chamber 1 when necessary, and the vacuum chamber 1 can be maintained and repaired separately.

[0087] The dust blocking valve 64 can be used to prevent a large amount of smoke and dust generated during smelting from entering the vacuum chamber 1.

[0088] At the beginning of smelting, both the gate valve 62 and the dust-blocking valve 64 are opened. The dust-blocking valve 64 can be closed after the powder spraying gun 7 is inserted into the appropriate position in the reaction chamber. The dust-blocking valve 64 clamps the powder spraying gun 7 in the middle, blocking the reaction chamber and the vacuum chamber 1. The outer end of the powder inlet pipe 41 starts to feed, and the inert gas drives the powder through the powder inlet pipe 41 and the powder spraying gun 7, and finally sprays out from the nozzle of the powder spraying gun 7. The dust-blocking valve 64 can prevent a large amount of smoke and dust generated during smelting from entering the vacuum chamber 1.

[0089] After the smelting is completed, the powder supply is stopped, the dust valve 64 is opened, the reduction motor 24 is reversed, and the trolley 3 is driven up through the chain drive device. When the trolley 3 rises to the right position, the reduction motor 24 stops rotating. Close the gate valve 62 to isolate the reaction vessel from the vacuum chamber 1. Use compressed gas to cool the powder gun 7 until it is detected to be within the safe temperature range. The vacuum chamber 1 can be broken. The breaking process must be carried out step by step in strict accordance with the operating procedures to balance the pressure difference inside and outside the vacuum chamber 1. When the pressure inside the vacuum chamber 1 is equal to the pressure of the external environment, maintenance and other work can be carried out to prepare for the next production operation.

[0090] In a specific embodiment of the present invention, the dust-blocking valve 64 may include a first valve plate 641 and a second valve plate 642 that are separated from each other. 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 spray gun 7 is located in the circular hole and has a gap with the edge of the circular hole. The gap can meet the shaking of the powder spray gun 7 during the powder spraying process.

[0091] After the first valve plate 641 and the second valve plate 642 are closed, only the powder spray gun 7 is allowed to pass through, which can minimize the rise of smoke and dust.

[0092] In a specific embodiment of the present invention, in order to facilitate the control of the powder spraying position of the powder spraying gun 7, a laser rangefinder 28 of the forward impact trolley 3 is arranged above the steel support frame 21, and the laser rangefinder 28 is electrically connected to the encoder 241 of the reduction motor 24.

[0093] The laser rangefinder 28 detects the position of the trolley 3 in real time, and feeds back the signal to the outside of the vacuum chamber 1 , so as to grasp the position of the trolley 3 in real time, and thus grasp the powder spraying position of the powder spraying gun 7 .

[0094] The encoder 241 obtains the speed and rotation angle of the reduction motor 24 and determines the elongation of the chain based on the speed and rotation angle, so as to calculate the position of the trolley 3 and thus the powder spraying position of the powder spraying gun 7 .

[0095] In the vacuum chamber 1, the laser rangefinder 28 and the encoder 241 are used to simultaneously obtain the powder spraying position of the powder spraying gun 7 for closed-loop control. The position of the powder spraying gun is dynamically adjusted to control the rotation of the reduction motor 24 to achieve a suitable position.

[0096] 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 melt. These airflows can drive the melt to roll. The rolling of the melt makes the internal substances mixed more fully, increases the contact area between the reactants, and makes the chemical reaction more intense, which is beneficial to improving the efficiency and quality of smelting.

[0097] After smelting is completed, the reduction motor 24 reverses and the trolley 3 rises to the highest point.

[0098] In a specific embodiment of the present invention, in order to reduce vacuuming, the vacuum chamber 1 includes a cylindrical vacuum chamber 11 and a box-type vacuum chamber 12 connected up and down, and the box-type vacuum chamber 12 is connected to the cylindrical vacuum chamber 11 by a flange and bolts. The cross-sectional area of ​​the cylindrical vacuum chamber 11 is smaller than the cross-sectional area of ​​the box-type vacuum chamber 12, and one side wall of the cylindrical vacuum chamber 11 is aligned with one side wall of the box-type vacuum chamber 12. The cylindrical vacuum chamber 11 and the box-type vacuum chamber 12 are both made of high-strength carbon steel.

[0099] 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, shorten the vacuum pumping time, and facilitate subsequent maintenance.

[0100] In order to further stably support the tall vacuum chamber 1 , a ring plate 13 is arranged around the bottom of the box-shaped vacuum chamber 12 , and a powder spray gun bracket on the reaction chamber is supported under the ring plate 13 .

[0101] Since the powder spray gun 7 is inserted into the reaction melt for a long time during use, and is lifted into the vacuum chamber 1 after smelting, the temperature is thousands of degrees. At the same time, the graphite material of the powder spray gun 7 has a large specific heat, and it will radiate heat to the surrounding steel support frame 21 and other parts in a vacuum environment. If the steel temperature is too high, the mechanical properties will be reduced, and it may bend or even break, become unstable, and collapse. In order to protect the steel support frame 21 and other parts from the heat radiation of the powder spray gun 7, a thermal control coating is applied to the side of the steel support frame 21 facing the powder spray gun 7 and the surface of important parts. The thermal control coating can be a low-absorption and low-emissivity thermal control coating to reduce the heat radiation absorbed by the steel support frame 21.

[0102] A water cooling system is also provided on the outer wall of the vacuum chamber 1 to absorb the heat on the outer wall of the vacuum chamber 1 , thereby ensuring the safety of the equipment and increasing its service life.

[0103] The water cooling system may include a water tank and a water pipe disposed outside the vacuum chamber 1, and the water pipe is attached to the outer wall of the vacuum chamber 1. Water in the water tank is pumped into the water pipe to cool the outer wall of the vacuum chamber 1, and the hot water in the water pipe flows to an external cooling tower for collection and cooling.

[0104] The present invention provides a set of non-ferrous metal smelting vacuum powder spraying device with high efficiency, high automation, strong applicability and strong safety, which can realize continuous powder spraying and adjustable powder spraying position in the whole process of magnesium smelting liquid blowing method.

[0105] Example 2

[0106] like Figure 5 As shown, this embodiment provides a method for using a metal smelting vacuum powder spraying device, which uses the metal smelting vacuum powder spraying device described in Example 1 to perform powder spraying.

[0107] The method for using the metal smelting vacuum powder spraying device comprises the following steps:

[0108] S1: The box-type vacuum chamber 12 is hoisted above the reaction chamber, and the connecting channel 6 is connected to the powder spray gun mounting sleeve on the reaction chamber. The powder spray gun bracket on the reaction chamber supports the ring plate 13 at the bottom of the vacuum chamber 1. The powder spray gun lifting component 2, the powder spray gun 7 and the powder inlet pipe 41 are installed in the box-type vacuum chamber 12. The cylindrical vacuum chamber 11 is installed on the upper part of the box-type vacuum chamber 12, and the cylindrical vacuum chamber 11 is connected to the powder inlet pipe 41.

[0109] First, install the box-type vacuum chamber 12 by hoisting machinery to the top of the reaction chamber, connect the powder gun installation sleeve on the reaction chamber, connect the powder gun installation sleeve and the connection channel 6, and use flanges and bolts to connect, which is convenient for the connection between the vacuum chamber 1 and the reaction chamber. After the connection, the gate valve 62 is located above the powder gun installation sleeve of the reaction chamber, which is used to cut off the vacuum connection between the vacuum chamber 1 and the reaction chamber when necessary, so as to facilitate the separate maintenance of the components in the vacuum chamber 1.

[0110] The ring plate 13 is a steel plate arranged around the bottom of the vacuum chamber 1 . The powder spray gun bracket on the reaction chamber is supported under the ring plate 13 of the vacuum chamber 1 , which can assist in supporting the tall and heavy vacuum chamber 1 and contribute to the stability of the vacuum chamber 1 .

[0111] The powder spray gun lifting member 2 , the powder spray gun 7 , the powder inlet pipe 41 , the drag chain 42 and other components are installed in the box-shaped vacuum chamber 12 .

[0112] The cylindrical vacuum chamber 11 may include a cylinder with openings at both ends and a cylinder cover. The cylinder is hoisted and connected to the box-type vacuum chamber 12. The other end of the powder hose and the other end of the drag chain are connected inside the cylinder. After all parts are installed, the cylinder cover is buckled on the cylinder and installed.

[0113] S2: Evacuate the vacuum chamber 1 and open the gate valve 62.

[0114] After installation, the vacuum chamber 1 can be evacuated by a vacuum pump, and the reaction chamber can also be evacuated at the same time. The gate valve 62 can be opened after evacuation, or the gate valve 62 can be opened first and then evacuation. The vacuum degree reaches the smelting requirements.

[0115] S3: By controlling the reduction motor 24, the trolley 3 is made to descend along the steel support frame 21, so as to drive the powder spraying gun 7 to pass through the connecting channel 6 and enter the reaction chamber.

[0116] A vacuum environment is formed, and powder spraying preparation can be carried out. Initially, the trolley 3 is at the highest point of the steel support frame 21, and the reduction motor 24 is in the initial state. To control the trolley 3 to descend to a suitable position in the reaction chamber, the reduction motor 24 is turned on, and the reduction motor 24 rotates forward, driving the sprocket assembly 25 to rotate, and the sprocket assembly 25 drives the chain 26 to rotate, thereby driving the trolley 3 to descend.

[0117] The real-time position of the trolley 3 can be calculated through the data of the laser rangefinder 28 above the steel support frame 21 or the encoder 241 on the reduction motor 24, so as to judge whether the powder spraying position of the powder spraying gun 7 is appropriate. If it is not appropriate, the reduction motor 24 can be adjusted to adjust the position of the trolley 3, so as to achieve the purpose of accurately controlling the powder spraying position of the powder spraying gun 7.

[0118] The laser rangefinder 28 and the encoder 241 collect data simultaneously, and can be combined with each other to determine the position of the vehicle 3 in a vacuum environment with a certain amount of smoke, fuzzy high temperature.

[0119] While the reduction motor 24 drives the trolley 3 to rise and fall, the hoist 52 of the anti-fall mechanism 5 runs synchronously with the rise and fall of the trolley 3, which can prevent the trolley 3 from falling or hitting the top when it suddenly loses control.

[0120] S4: After the powder spraying gun 7 is lowered into position, the dust blocking valve 64 is closed, and the powder bin continues to supply materials to the powder inlet pipe 41, so that the powder spraying gun 7 continues to spray powder.

[0121] After the powder spray gun 7 is in place, powder spraying smelting begins. In order to prevent a large amount of smoke and dust from entering the vacuum chamber 1 during the smelting process, the dust blocking valve 64 is closed first. The dust blocking valve 64 covers the cross section of the connecting channel 6, and only the powder spray gun 7 passes through the middle, which blocks smoke and dust from entering the vacuum chamber 1 to the greatest extent.

[0122] The valve 43 in the powder bin is opened, and the powder blowing device is used to feed the powder into the powder inlet pipe 41. The powder enters the powder spraying gun 7 along the powder inlet pipe 41, and the powder spraying gun 7 sprays the powder out.

[0123] The metal smelting vacuum powder spraying device and the use method thereof according to the present invention are described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the metal smelting vacuum powder spraying device and the use method thereof proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A metal smelting vacuum powder spraying device, characterized in that: It comprises a vacuum chamber, a powder spray gun lifting mechanism and a powder spray gun arranged in the vacuum chamber, wherein: The powder spray gun lifting mechanism comprises a steel support frame arranged upward from the bottom of the vacuum chamber, and a liftable trolley is arranged on the steel support frame; A powder spray gun is mounted vertically downward on the trolley, the upper end of the powder spray gun is connected to one end of a powder inlet pipe, the other end of the powder inlet pipe passes through the side wall of the vacuum chamber and is connected to a powder bin, and the part of the powder inlet pipe located in the vacuum chamber is arranged in the drag chain; A connecting channel is arranged at the bottom of the vacuum chamber, the connecting channel is communicated with the reaction chamber, and the powder spraying gun is directed toward the center of the connecting channel.

2. The metal smelting vacuum powder spraying device according to claim 1, characterized in that: The steel support frame includes an intermediate frame and side frames arranged on both sides of the intermediate frame, a vertical track is arranged in the middle of the intermediate frame and on the side frames, and a limit stopper is arranged at both ends of the track; The trolley comprises an intermediate frame, upper frames are vertically connected to both sides of the upper end of one side of the intermediate frame, lower frames are vertically connected to both sides of the lower end of the side, and powder spray gun fixing components are arranged between the two lower frames and the two upper frames; Wheel mounting rods are respectively arranged at the upper and lower ends of the other side surface of the intermediate frame, and wheels respectively adapted to the corresponding tracks are arranged on the wheel mounting rods; The trolley is arranged in the steel support frame, and the wheels are arranged on corresponding tracks.

3. The metal smelting vacuum powder spraying device according to claim 2, characterized in that: The powder spray gun fixing component comprises an outer peripheral flange fixed to the outer periphery of the powder spray gun, a connecting flange is connected to the outer peripheral flange by bolts, two hanging rods are connected to the outer wall of the connecting flange, the two hanging rods are on the same straight line with a diameter of the connecting flange, a first pin hole is arranged on the hanging rod, and the central axis of the first pin hole is parallel to the central axis of the connecting flange; A groove is provided at the outer ends of the upper frame and the lower frame, and a vertical second pin hole is provided in the groove; The hanging rods are respectively arranged in corresponding grooves and connected via a pin shaft passing through a first pin hole and a second pin hole facing each other.

4. The metal smelting vacuum powder spraying device according to claim 1, characterized in that: The powder spray gun lifting mechanism also includes a reduction motor arranged outside the vacuum chamber, a transmission shaft of the reduction motor penetrates the side wall of the vacuum chamber and is connected to a sprocket assembly, a chain is meshed on the sprocket assembly, and two ends of the chain are respectively connected to the upper and lower ends of the trolley; The transmission shaft is rotatably connected to the side wall of the vacuum chamber via a first dynamic sealing device.

5. The metal smelting vacuum powder spraying device according to claim 4, characterized in that: A laser rangefinder facing the trolley is arranged above the steel support frame, and an encoder is arranged on the reduction motor.

6. The metal smelting vacuum powder spraying device according to claim 1, characterized in that: It also includes an anti-falling mechanism, which includes a rotating motor arranged at the lower part of the outside of the vacuum chamber, the rotating shaft of the rotating motor penetrates the side wall of the vacuum chamber, and is connected to the drum of the hoist arranged at the lower part of the vacuum chamber, two groups of steel wire ropes are arranged on the drum, the two groups of steel wire ropes are respectively passed around the two groups of fixed pulleys at the upper part of the steel support frame and connected to the upper two ends of the trolley, and the hoist and the lifting of the trolley are synchronously operated; The rotating shaft is rotatably connected to the side wall of the vacuum chamber via a second dynamic sealing device.

7. The metal smelting vacuum powder spraying device according to claim 1, characterized in that: The connecting channel includes a bellows connected to the bottom of the vacuum chamber, a gate valve is arranged at the lower end of the bellows, a connecting pipe is arranged below the gate valve, a dust blocking valve is arranged on the connecting pipe, and the connecting pipe is connected to the powder spray gun mounting sleeve on the reaction chamber.

8. The metal smelting vacuum powder spraying device according to claim 7, characterized in that: The dust-blocking valve comprises a first valve plate and a second valve plate which are separated from each other. When the first valve plate and the second valve plate are closed, they cover the cross section of the connecting pipe and have a circular hole in the middle. The powder spray gun is located in the circular hole.

9. The metal smelting vacuum powder spraying device according to claim 1, characterized in that: The vacuum chamber comprises a cylindrical vacuum chamber and a box-shaped vacuum chamber connected up and down, 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 the cross-sectional area of ​​the box-shaped vacuum chamber, and one side wall of the cylindrical vacuum chamber is aligned with one side wall of the box-shaped vacuum chamber; A ring plate is arranged around the bottom of the box-type vacuum chamber, and a powder spray gun bracket on the reaction chamber is supported under the ring plate.

10. A method for using a metal smelting vacuum powder spraying device, using the metal smelting vacuum powder spraying device according to any one of claims 1 to 9 for powder spraying, characterized in that: The following steps are involved: S1: hoisting the box-type vacuum chamber above the reaction chamber, and connecting the connecting channel with the powder spray gun mounting sleeve on the reaction chamber, the powder spray gun bracket on the reaction chamber supports the ring plate at the bottom of the box-type vacuum chamber, installing the powder spray gun lifting component, the powder spray gun and the powder inlet pipe in the box-type vacuum chamber, installing the cylindrical vacuum chamber on the upper part of the box-type vacuum chamber, and connecting the powder inlet pipe with the side wall of the cylindrical vacuum chamber; S2: evacuate the vacuum chamber and open the gate valve; S3: controlling the reduction motor to make the trolley descend along the steel support frame to drive the powder spray gun to pass through the connecting channel and enter the reaction chamber; S4: After the powder spray gun is lowered into position, the dust blocking valve is closed, and the powder bin continues to supply material to the powder inlet pipe, so that the powder spray gun continues to spray powder.

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