Upper chamber atomization gas electrode induction gas atomization powder making device and method

Abstract

The upper chamber atomization gas electrode induction gas atomization powder making device comprises a smelting chamber, an atomization chamber and an induction coil, the induction coil is arranged in the middle of the smelting chamber, and the upper chamber atomization gas electrode induction gas atomization powder making device is characterized in that an air inlet is formed in the outer wall of the smelting chamber, a material changing chamber is arranged at the top of the smelting chamber, the material changing chamber and the smelting chamber are communicated, and a material conveying channel is arranged between the material changing chamber and the smelting chamber; the invention further discloses a preparation method, the gas consumption is reduced, the production efficiency is improved, the production cost is reduced, and the problems that the existing atomization gas consumption is large, gas blowback is achieved, the optimal atomization position of a nozzle is difficult to adjust and the like can be solved.

Description

Technical Field

[0001] The invention relates to the field of preparation of metal powder materials, and more particularly to an upper chamber atomization gas electrode induction gas atomization powder making device and method. Background Art

[0002] With the rapid development of additive manufacturing technology, the demand for spherical titanium alloy powder has also increased significantly. At present, the electrode induction gas atomization process is the mainstream preparation method of spherical titanium alloy powder. However, in the process of mass production, this process has problems such as high gas consumption, gas backblowing, and difficulty in adjusting the optimal atomization position of the nozzle. The current atomization process is that a large amount of high-pressure gas passes through the annular gap of the spray disc to atomize the droplets. The atomization effect is closely related to the assembly of the spray disc. A good atomization effect requires multiple fine-tuning of the relative position of the nozzle, and this process takes a long time. At the same time, there is gas backblowing in the atomization process, which leads to nozzle blockage and discharge of the smelting chamber coil, affecting the efficiency and safety of powder making.

[0003] After investigation, the patent number is CN202121304469.6, which discloses a vacuum electrode induction melting double-flow gas atomization metal powder device. The key points of its technical solution are that it includes a melting chamber and an atomization chamber, the melting chamber is located above the atomization chamber, and the melting chamber and the atomization chamber are connected at the connection, the melting chamber includes an induction coil, an atomization nozzle and a vertically arranged metal rod, the atomization chamber includes a shell, the top wall of the shell is set as a double-layer cavity structure, the upper end of the top wall of the shell is provided with a high-pressure air inlet, and the lower surface of the top wall is provided with a plurality of air outlets, the air outlets are extended from the center of the top wall to the edge so as to be arranged in a long strip shape, and the plurality of air outlets are evenly distributed in a ring along the central axis of the shell; a collection tank and a gas recovery device are provided at the lower end of the atomization chamber, and the collection tank and the gas recovery device are connected to the shell. The device can be used to prepare fine spherical metal powders, and can reduce the "satellite powder" phenomenon, which is conducive to improving the fluidity of metal powders, but the production efficiency still has room for improvement. Summary of the invention

[0004] The present invention is mainly aimed at the above-mentioned problems. This patent proposes a low-gas-consumption upper chamber atomization gas electrode induction gas atomization powder making device and method, which can solve the existing problems of large atomization gas consumption, gas backblowing, and difficulty in adjusting the optimal atomization position of the nozzle, thereby reducing gas consumption, improving production efficiency, and reducing production costs.

[0005] The technical solution of the present invention is: an upper chamber atomizing gas electrode induction gas atomization powder making device, comprising a smelting chamber, an atomizing chamber, and an induction coil. The middle part of the smelting chamber is provided with an induction coil, and is characterized in that an air inlet is provided on the outer wall of the smelting chamber, and a material changing chamber is provided on the top of the smelting chamber. The material changing chamber is connected with the smelting chamber and is provided with a material transfer channel. A lifting component is provided in the material changing chamber to transfer the rod material to the smelting chamber through the material transfer channel.

[0006] Further improvement: a material changing chamber door is provided on the outer wall of the material changing chamber, and a partition plate with a size matching the material changing chamber is provided at the bottom of the material changing chamber to separate the material changing chamber from the smelting chamber.

[0007] Further improvement: The lifting assembly includes a lifting bracket, a lifting motor is arranged on the upper part of the lifting bracket, the lifting motor is connected to a slider, a rotating motor is fixed on the slider, and a rod is replaceably fixed on the bottom of the rotating motor through a clamping device.

[0008] Further improvement: an air inlet assembly is provided at the outer end of the air inlet, the air inlet assembly includes a pressure regulating valve, a gas heating assembly is provided at the outer end of the pressure regulating valve, and a baffle is provided on the inner wall of the air inlet of the smelting chamber.

[0009] Further improvement: Below the smelting chamber is an atomization chamber, and a Laval nozzle is provided on the top of the atomization chamber, and the top of the Laval nozzle matches the position of the rod and the induction coil.

[0010] Further improvement: the bar material is made of titanium alloy bar material.

[0011] Finally: A method for preparing an upper chamber atomization gas electrode induction gas atomization powder making device, characterized in that the steps are as follows:

[0012] Step 1: Lower the partition to separate the material changing chamber from the smelting chamber, open the air release valve, and fill the material changing chamber with air;

[0013] Step 2: Open the door of the material changing chamber again, add titanium alloy bars into the material changing chamber, evacuate to a specified vacuum degree, raise the partition, and connect the material changing chamber with the melting chamber;

[0014] Step 3: The titanium alloy bar moves downward into the induction coil at a certain rotation speed and movement speed under the control of the rotating motor and the lifting assembly;

[0015] Step 4: The pressure in the smelting chamber is adjusted to a suitable pressure through the pressure regulating valve, and the gas enters the smelting chamber stably through the baffle plate;

[0016] Step 5: Turn on the coil power supply to melt the bar material. The melted droplets are carried into the lava nozzle by the high-pressure gas and atomized in the atomization chamber.

[0017] Step 6: When the titanium alloy rod is completely melted, the material head returns to the top under the control of the lifting assembly.

[0018] Compared with the existing technology, the advantages of this product are: it is safer for users to use partitions when replacing rods, and the operation is standardized. The rotating motor and the lifting assembly stably move the rods down, and the nozzle and the induction coil cooperate to improve the efficiency of atomizing metal. It can solve the existing problems of large atomization gas consumption, gas backblowing, and difficulty in adjusting the optimal atomization position of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 The schematic diagram of the melting chamber.

[0021] In the figure, 1, smelting chamber, 2, atomization chamber, 3, induction coil, 4, air inlet, 5, material change chamber, 6, material transfer channel, 7, lifting assembly, 8, rod material, 9, material change chamber door, 10, partition, 11, lifting bracket, 12, rotating motor, 13, air inlet assembly, 14, pressure regulating valve, 15, gas heating assembly, 16, baffle, 17, Laval nozzle. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the implementation methods of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] according to Figure 1 to Figure 2, an upper chamber atomizing gas electrode induction gas atomization powder making device, comprising a smelting chamber 1, an atomizing chamber 2, and an induction coil 3. The induction coil 3 is provided in the middle of the smelting chamber 1. The improvement lies in that an air inlet 4 is provided on the outer wall of the smelting chamber 1, and a material changing chamber 5 is provided on the top of the smelting chamber 1. The material changing chamber 5 is connected to the smelting chamber 1 and is provided with a material transfer channel 6. A lifting component 7 is provided in the material changing chamber 1 to transfer the rod material to the smelting chamber 1 through the material transfer channel.

[0026] The material changing chamber 5 and the smelting chamber 1 are pressure-resistant devices, with a pressure of 3.0 MPa. The bottom of the material changing chamber 5 is connected to the smelting chamber 1. The outer wall of the material changing chamber 5 is provided with a material changing chamber door 9. The bottom of the material changing chamber 5 is provided with a partition 10 of a size matching the material changing chamber 5, which is used to separate the material changing chamber 5 from the smelting chamber 1. The lifting assembly 7 includes a lifting bracket 11. The upper part of the lifting bracket 11 is provided with a lifting motor 17. The lifting motor 17 is connected to a slider 18 through a sprocket chain drive mechanism or a gear rack drive mechanism. A rotating motor 12 is fixed on the slider 18. The bottom of the rotating motor 12 is replaceably fixed with a bar 8 through a clamping device 19. The bar 8 is a titanium alloy bar. The outer end of the air inlet 4 of the smelting chamber 1 is provided with an air inlet assembly 13. The air inlet assembly 13 includes a pressure regulating valve 14. The outer end of the pressure regulating valve 14 is provided with a gas heating assembly 15. A baffle 16 is provided on the inner wall of the air inlet 4 of the smelting chamber 1. Below the smelting chamber 1 is the atomizing chamber 2. A Laval nozzle 17 is provided on the top of the atomizing chamber 2. The top of the Laval nozzle 17 matches the position of the rod 8 and the induction coil 3. When the rod 8 is transferred to the position of the induction coil 3 through the lifting assembly 7, it will be melted and finally sprayed out from the Laval nozzle 17 to form powder.

[0027] The preparation method of the device is as follows:

[0028] Step 1: lower the partition 10 to separate the material changing chamber 5 from the smelting chamber 1, open the air release valve, and fill the material changing chamber 5 with air;

[0029] Step 2: Open the refueling chamber door 9 again, add the titanium alloy bar 8 into the refueling chamber 5, evacuate to a specified vacuum degree, raise the partition 10, and connect the refueling chamber 5 with the smelting chamber 1;

[0030] Step 3: The titanium alloy bar 8 moves downward into the induction coil 3 at a certain rotation speed and movement speed under the control of the rotating motor 12 and the lifting assembly 7;

[0031] Step 4: The pressure in the smelting chamber 1 is adjusted to a suitable pressure through the pressure regulating valve 14, and the gas enters the smelting chamber 1 stably through the baffle plate 16;

[0032] Step 5: Turn on the coil power supply to melt the bar material 8. The melted droplets are carried into the lava nozzle 17 by the high-pressure gas and then atomized in the atomization chamber 2.

[0033] Step 6: When the titanium alloy rod is completely melted, the material head returns to the top under the control of the lifting assembly 7.

Claims

1. An upper chamber atomizing gas electrode induction gas atomization powder making device, comprising a smelting chamber, an atomizing chamber, and an induction coil, wherein an induction coil is provided in the middle of the smelting chamber, characterized in that: An air inlet is arranged on the outer wall of the smelting chamber, a material changing chamber is arranged on the top of the smelting chamber, the material changing chamber is connected with the smelting chamber and a material transfer channel is arranged therebetween, a lifting assembly is arranged in the material changing chamber to transfer the rod material to the smelting chamber through the material transfer channel.

2. The upper chamber atomization gas electrode induction gas atomization powder making device according to claim 1 is characterized in that The outer wall of the material changing chamber is provided with a material changing chamber door, and the bottom of the material changing chamber is provided with a partition plate with a size matching the material changing chamber, which is used to separate the material changing chamber from the smelting chamber.

3. The upper chamber atomization gas electrode induction gas atomization powder making device according to claim 1 is characterized in that The lifting assembly comprises a lifting bracket, a lifting motor is arranged on the upper part of the lifting bracket, the lifting motor is connected to a slide block, a rotating motor is fixed on the slide block, and a rod is replaceably fixed on the bottom of the rotating motor through a clamping device.

4. The upper chamber atomization gas electrode induction gas atomization powder making device according to claim 1 is characterized in that The outer end of the air inlet is provided with an air inlet assembly, the air inlet assembly includes a pressure regulating valve, the outer end of the pressure regulating valve is provided with a gas heating assembly, and a baffle is provided on the inner wall of the air inlet of the smelting chamber.

5. The upper chamber atomization gas electrode induction gas atomization powder making device according to claim 1 is characterized in that Below the smelting chamber is an atomizing chamber, and a Laval nozzle is arranged on the top of the atomizing chamber. The top of the Laval nozzle matches the position of the rod and the induction coil.

6. The upper chamber atomization gas electrode induction gas atomization powder making device according to claim 1, characterized in that The bar material is a titanium alloy bar material.

7. A method for preparing the upper chamber atomizing gas electrode induction gas atomizing powder making device according to claims 1 to 6, characterized in that: The method comprises: Step 1: Lower the partition to separate the material changing chamber from the smelting chamber, open the air release valve, and fill the material changing chamber with air; Step 2: Open the door of the material changing chamber again, add titanium alloy bars into the material changing chamber, evacuate to a specified vacuum degree, raise the partition, and connect the material changing chamber with the melting chamber; Step 3: The titanium alloy bar moves downward into the induction coil at a certain rotation speed and movement speed under the control of the rotating motor and the lifting assembly; Step 4: The pressure in the smelting chamber is adjusted to a suitable pressure through the pressure regulating valve, and the gas enters the smelting chamber stably through the baffle plate; Step 5: Turn on the coil power supply to melt the bar material. The melted droplets are carried into the lava nozzle by the high-pressure gas and atomized in the atomization chamber. Step 6: When the titanium alloy rod is completely melted, the material head returns to the top under the control of the lifting assembly.

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