Spraying gap self-adaptive adjustment gas atomization spraying disc for powder preparation

Abstract

The utility model relates to the field of gas atomization of metal powder, in particular to a gas atomization spray disc with a self-adaptive spray gap for powder preparation. A main body of the gas atomization spray disc is composed of a spray disc cover, a spray disc seat and a spray disc bottom, external threads of the spray disc cover are connected with internal threaded holes of the spray disc seat through threads to form a thread pair, a spray disc cover guide shaft of the spray disc cover is in sliding fit with spray disc cover guide holes of the spray disc seat to form a guide pair, and the spray disc cover guide shaft is connected with the spray disc seat through a spring. The guide step of the spraying disc bottom is in sliding fit with the guide hole of the spraying disc bottom, and a gap formed between the inner wall of the inverted-circular-truncated-cone-shaped hole and the outer wall of the inverted-circular-truncated-cone-shaped step is a coupling type air blade circular seam; a high-pressure air cavity is defined by the spraying disc cover, the spraying disc base and the spraying disc bottom. According to the self-adaptive adjusting spray disc, the coupling type gas blade circular seam gap is adjusted through the spring between the spray disc cover and the spray disc seat, and the gas blade circular seam gap is automatically adjusted according to gas pressure in different stages in the atomization process to guarantee gas flow.

Description

Technical Field

[0001] The utility model relates to the field of gas atomization of metal powders, in particular to a gas atomization spray disc with a spray gap self-adaptively adjusted for powder preparation. Background Art

[0002] The basic principle of gas atomization is to use high-speed airflow to impact molten metal, convert the kinetic energy of the gas into the surface energy of the molten metal through collision, so that the molten metal flow is broken into fine droplets, and the droplets are quickly cooled and solidified in the airflow atmosphere to form powder.

[0003] Metal powder is the key raw material for additive manufacturing, and its quality largely determines the final quality of the product. With the rapid development of additive manufacturing technology and its process specificity, the quality requirements for metal powders are getting higher and higher, such as high sphericity, good fluidity, and low gas and impurity content. With the continuous expansion of the application field of additive manufacturing, more and more types of metal powders are required. Different types of master alloys require different production processes during the production process, including adjusting the flow rate of the atomizing gas.

[0004] At present, there are three main ways to adjust the flow rate of atomizing gas airflow, including: ① adjusting the input pressure of the atomizing nozzle to indirectly adjust the high-pressure gas flow rate; ② replacing the gas atomizing spray disc, increasing or decreasing the gas injection gap of the spray disc, and affecting the high-pressure gas flow rate; ③ changing the relative flow rate between the high-pressure gas flow and the melt flow by changing the diameter of the guide tube. Among them, the method of increasing the input pressure is limited by the size of the spray disc gap, and will cause risks caused by excessive local pressure. Replacing the gas atomizing spray disc requires preparing various different gas atomizing spray discs, which is relatively expensive and the replacement process is cumbersome. Changing the relative flow rate between the high-pressure gas flow and the melt flow will affect production efficiency; and when reducing the inner diameter of the guide nozzle, the cooling speed of the guide nozzle is accelerated due to the reduction in the flow rate of the molten steel flow, which increases the risk of nozzle clogging and is easy to affect the overheating of the molten steel flow. Utility Model Content

[0005] The utility model aims to provide an atomizing spray disc with a spray gap adaptively adjusted for powder preparation, which solves the problems of excessive local pressure, high cost or nozzle blockage that may be caused by adjusting the atomizing gas flow rate in the prior art.

[0006] The technical solution of the utility model is:

[0007] An aerosol spray disc with self-adaptive spray gap adjustment for powder preparation, the main body of the aerosol spray disc is composed of a spray disc cover, a spray disc seat, and a spray disc bottom, and the specific structure is as follows:

[0008] The spray disc cover is a stepped shaft-like structure with a guide hole in the center, and each step is, from top to bottom, an external thread with a reduced diameter, a spray disc cover guide shaft, and an inverted truncated cone-shaped step; the spray disc seat is a flange-like structure with a stepped through hole in the center, and the stepped through hole in the center of the spray disc seat is, from top to bottom, an internal thread hole, a spray disc cover guide hole, and a spray disc bottom guide hole; the spray disc bottom is a stepped shaft-like structure with a central through hole, and each step is, from top to bottom, a truncated cone-shaped step, a spray disc bottom guide shaft with an increased diameter, and a guide step, and the upper half of the central through hole of the spray disc seat is an inner wall with An inverted truncated cone-shaped hole with an inclined angle, the lower half of the central through hole of the spray disc seat is a truncated cone-shaped hole; the external thread of the spray disc cover and the internal threaded hole of the spray disc seat are threadedly connected to form a threaded pair, the spray disc cover guide shaft of the spray disc cover and the spray disc cover guide hole of the spray disc seat are slidingly matched to form a guide pair, the spray disc cover guide shaft and the spray disc seat are connected by a spring, the guide step of the spray disc bottom and the guide hole of the spray disc bottom are slidingly matched, and the gap formed between the inner wall of the inverted truncated cone-shaped hole and the outer wall of the inverted truncated cone-shaped step is a coupled air blade annular gap; a high-pressure air cavity is surrounded by the spray disc cover, the spray disc seat and the spray disc bottom.

[0009] The spray gap self-adapting gas atomization spray disc used for powder preparation has a guide hole in the center of the spray disc cover into which a guide nozzle with the function of guiding molten steel is inserted.

[0010] The spray gap self-adapting atomizing spray disc used for powder preparation has a spray disc seat with high-pressure air inlet holes and ceramic-sealed electrode holes respectively opened on the upper and lower side walls.

[0011] The aerosol spray disc with self-adaptive spray gap adjustment for powder preparation has a spray disc cover guide hole with a diameter smaller than the diameter of the internal thread hole and the spray disc bottom guide hole.

[0012] The spray gap adaptively adjustable aerosol spray disc for powder preparation forms a high-pressure air cavity between the spray disc cover, the spray disc seat and the spray disc bottom, and seals by pressing the contact surfaces between the three; or by machining a rubber ring groove on the contact surface and sealing with a rubber ring; or by applying sealing glue on the contact surface or pressing softer metal to achieve sealing.

[0013] The spray gap adaptively adjustable aerosol spray disc for powder preparation has springs with elastic connections evenly installed along the circumference between the lower end surface of the spray disc cover guide shaft of the spray disc cover and the upper end surface of the spray disc bottom guide shaft of the spray disc bottom, and a pre-tightening force is applied between the spray disc cover and the spray disc bottom through the spring.

[0014] The spray gap adaptively adjusting aerosol spray disc for powder preparation adjusts the coupled air blade annular gap by adjusting the thread pair between the spray disc cover and the spray disc seat. The coupled air blade annular gap changes by one thread pitch each time the thread rotates one circle.

[0015] The spray gap adaptively adjustable aerosol spray disc for powder preparation has a spray disc seat scale engraved on the upper end surface of the spray disc seat, and a pointer corresponding to the spray disc seat scale engraved on the upper end of the spray disc cover.

[0016] The spray gap adaptively adjustable aerosol spray disc for powder preparation has pressure-sensitive material evenly installed along the circumference between the lower end surface of the spray disc cover guide shaft of the spray disc cover and the upper end surface of the spray disc bottom guide shaft of the spray disc bottom, and a ceramic sealed electrode is installed in the ceramic sealed electrode hole on the side wall of the spray disc seat, and the pressure signal of the pressure-sensitive material is drawn out through the ceramic sealed electrode.

[0017] The advantages and beneficial effects of the utility model are:

[0018] 1. The main body of the aerosol spray disc of the utility model is composed of a spray disc cover, a spray disc seat, and a spray disc bottom. The gap between the inner wall of the spray disc bottom and the outer wall of the spray disc cover is a coupled air blade annular gap. The coupled air blade annular gap can be adjusted by a threaded pair between the spray disc cover and the spray disc seat. There is no need to replace aerosol spray discs of various specifications, thereby greatly reducing costs.

[0019] 2. In the utility model, a high-pressure air cavity is formed by close contact between the spray disc cover, the spray disc seat and the spray disc bottom. The high-pressure air inlet hole on the side wall of the spray disc seat introduces high-pressure gas into the high-pressure air cavity, so that the high-pressure gas passes through the coupled air blade annular gap between the spray disc cover and the spray disc bottom, thereby achieving uniform and controllable flow rate of the atomized gas, avoiding blockage of the guide nozzle and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1-Figure 2 It is a schematic diagram of the structure of the utility model. Figure 1 For the main view, Figure 2 This is a top view.

[0021] Figure 3 It is a schematic diagram of the structure of the spray plate cover.

[0022] Figure 4 It is a schematic diagram of the structure of the spray plate bottom.

[0023] Figure 5 It is a structural schematic diagram of the spray disc seat.

[0024] In the figure, 1 is a spray disc cover, 2 is a threaded pair, 3 is a spring, 4 is a high-pressure air inlet hole, 5 is a ceramic-sealed electrode, 6 is an electrode nut, 7 is a spray disc seat, 8 is a pressure-sensitive material, 9 is a spray disc bottom, 10 is an inverted truncated cone-shaped hole, 11 is a coupled air blade annular seam, 12 is an inverted truncated cone-shaped step, 13 is a ceramic-sealed electrode hole, 14 is a high-pressure air cavity, 15 is a guide pair, 16 is a flow guide center hole, 17 is a spray disc seat scale, 18 is a pointer, 19 is an external thread, 20 is a spray disc cover guide shaft, 21 is a spray disc bottom guide shaft, 22 is a spray disc cover guide hole, 23 is a spray disc bottom guide hole, 24 is an internal thread hole, and 25 is a guide step. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 5 As shown, the utility model proposes an aerosol spray disc with a spray gap adaptively adjusted for powder preparation. The main body of the aerosol spray disc is composed of a spray disc cover 1, a spray disc seat 7, and a spray disc bottom 9. It mainly includes a spray disc cover 1, a threaded pair 2, a spring 3, a high-pressure air inlet 4, a ceramic electrode 5, an electrode nut 6, a spray disc seat 7, a pressure-sensitive material 8, a spray disc bottom 9, an inverted truncated cone-shaped hole 10, a coupled air blade annular seam 11, an inverted truncated cone-shaped step 12, a ceramic electrode hole 13, a high-pressure air cavity 14, a guide pair 15, a guide hole 16, a spray disc seat scale 17, a pointer 18, an external thread 19, a spray disc cover guide shaft 20, a spray disc bottom guide shaft 21, a spray disc cover guide hole 22, a spray disc bottom guide hole 23, an internal thread hole 24, etc. The specific structure is as follows:

[0026] The spray disc cover 1 is a stepped shaft-like structure with a guide hole 16 in the center. The steps are, from top to bottom, an external thread 19 with decreasing diameter, a spray disc cover guide shaft 20, and an inverted frustum-shaped step 12 with an inclined angle on the outer wall. The guide hole 16 in the center of the spray disc cover 1 is used to insert a guide nozzle that has the function of draining molten steel.

[0027] The spray disc seat 7 is a flange-like structure with a stepped through hole in the center. The side walls of the spray disc seat 7 are respectively provided with a high-pressure air inlet hole 4 and a ceramic sealed electrode hole 13. The stepped through hole in the center of the spray disc seat 7 is, from top to bottom, an internal threaded hole 24, a spray disc cover guide hole 22 and a spray disc bottom guide hole 23. The diameter of the spray disc cover guide hole 22 is smaller than the diameter of the internal threaded hole 24 and the spray disc bottom guide hole 23.

[0028] The spray disc bottom 9 is a stepped shaft structure with a central through hole, and the steps from top to bottom are successively a truncated cone step and a spray disc bottom guide shaft 21 and a guide step 25 with increasing diameters. The upper half of the central through hole of the spray disc seat 7 is an inverted truncated cone hole 10 with an inclined inner wall, and the lower half of the central through hole of the spray disc seat 7 is a truncated cone hole.

[0029] The external thread 19 of the spray disc cover 1 and the internal thread hole 24 of the spray disc seat 7 are connected by threads to form a thread pair 2. The spray disc cover guide shaft 20 of the spray disc cover 1 and the spray disc cover guide hole 22 of the spray disc seat 7 are slidably matched to form a guide pair 15 for axial guidance. The guide step 25 of the spray disc bottom 9 is slidably matched with the spray disc bottom guide hole 23. The gap formed between the inner wall of the inverted truncated cone hole 10 and the outer wall of the inverted truncated cone step 12 is a coupled air blade annular gap 11. The spray disc cover 1, the spray disc seat 7, and the spray disc bottom 9 form a high-pressure gas cavity 14. The high-pressure gas is input into the high-pressure gas cavity 14 through the high-pressure gas inlet hole 4. The molten steel in the guide nozzle flows out through the guide middle hole 16 in the center of the spray disc cover 1. The high-pressure gas realizes the gas atomization of the molten steel through the coupled air blade annular gap 11. The thread pair 2 between the spray disc cover 1 and the spray disc seat 9 can be adjusted to adjust the gap of the coupled air blade annular gap 11. The coupled air blade annular gap 11 changes one pitch every time the thread rotates one circle.

[0030] The spray plate seat 7 and the spray plate bottom 9 can be assembled separately or processed into an integral body.

[0031] The high-pressure air cavity 14 formed among the spray disc cover 1, the spray disc seat 7 and the spray disc bottom 9 can be sealed by pressing the contact surfaces between the three to achieve a tight fit; or, it can be sealed by machining a rubber ring groove on the contact surface through a rubber ring; or, it can be achieved by applying sealing glue on the contact surface or pressing a softer metal (such as silver wire, copper wire, etc.).

[0032] A spring 3 with an elastic connection is evenly installed along the circumference between the lower end surface of the spray disc cover guide shaft 20 of the spray disc cover 1 and the upper end surface of the spray disc bottom guide shaft 21 of the spray disc bottom 9, and a pre-tightening force is applied between the spray disc cover 1 and the spray disc bottom 9 by the spring 3 to eliminate the influence of the thread tooth meshing clearance in the thread pair 2 on the clearance adjustment process of the coupled air blade annular gap 11.

[0033] Since the gap of the coupled air blade annular gap 11 changes by one pitch every time the thread of the thread pair 2 rotates one circle, a spray disc seat scale 17 can be engraved on the upper end surface of the spray disc seat 9, and a pointer 18 corresponding to the spray disc seat scale 17 can be engraved on the upper end of the spray disc cover 1. The gap of the coupled air blade annular gap 11 is made to correspond to the scale, so as to realize the visualization of the gap of the coupled air blade annular gap 11.

[0034] Pressure-sensitive material 8 is evenly installed along the circumference between the lower end surface of the spray disc cover guide shaft 20 of the spray disc cover 1 and the upper end surface of the spray disc bottom guide shaft 21 of the spray disc bottom 9, and a pottery seal electrode 5 is installed in the pottery seal electrode hole 13 of the side wall of the spray disc seat 7, and the pottery seal electrode 5 is fixed to the side wall of the spray disc seat 7 through the electrode pressing nut 6 on the pottery seal electrode 5, and the pressure signal of the pressure-sensitive material 8 is led out through the pottery seal electrode 5. The thread pair 2 between the spray disc cover 1 and the spray disc seat 7 is adjusted, and the spray disc cover 1 is rotated up and down, and the pressure of the pressure-sensitive material 8 changes. According to the linear relationship between the pressure signal and the screw-in depth of the thread pair 2, the gap of the coupled air blade annular gap 11 can be digitized, and the digital adjustment of the annular gap can be achieved by rotating the thread pair 2 by means of an electric control actuator.

[0035] The implementation results show that the adaptively adjustable spray disc of the utility model adjusts the coupled air blade annular gap through the guide sub-spring between the spray disc cover and the spray disc seat, so as to automatically adjust the air blade annular gap according to the gas pressure at different stages during the atomization process to ensure the gas flow rate, thereby improving the gas utilization rate and reducing the experimental cost.

Claims

1. An atomizing spray disc with self-adaptive spray gap adjustment for powder preparation, characterized in that: The main body of the aerosol spray disc is composed of a spray disc cover, a spray disc seat, and a spray disc bottom. The specific structure is as follows: The spray disc cover is a stepped shaft-like structure with a guide hole in the center, and each step is, from top to bottom, an external thread with a reduced diameter, a spray disc cover guide shaft, and an inverted truncated cone-shaped step; the spray disc seat is a flange-like structure with a stepped through hole in the center, and the stepped through hole in the center of the spray disc seat is, from top to bottom, an internal thread hole, a spray disc cover guide hole, and a spray disc bottom guide hole; the spray disc bottom is a stepped shaft-like structure with a central through hole, and each step is, from top to bottom, a truncated cone-shaped step, a spray disc bottom guide shaft with an increased diameter, and a guide step, and the upper half of the central through hole of the spray disc seat is an inner wall with An inverted truncated cone-shaped hole with an inclined angle, the lower half of the central through hole of the spray disc seat is a truncated cone-shaped hole; the external thread of the spray disc cover and the internal threaded hole of the spray disc seat are threadedly connected to form a threaded pair, the spray disc cover guide shaft of the spray disc cover and the spray disc cover guide hole of the spray disc seat are slidingly matched to form a guide pair, the spray disc cover guide shaft and the spray disc seat are connected by a spring, the guide step of the spray disc bottom and the guide hole of the spray disc bottom are slidingly matched, and the gap formed between the inner wall of the inverted truncated cone-shaped hole and the outer wall of the inverted truncated cone-shaped step is a coupled air blade annular gap; a high-pressure air cavity is surrounded by the spray disc cover, the spray disc seat and the spray disc bottom.

2. The aerosol spray disc with self-adaptive spray gap adjustment for powder preparation according to claim 1, characterized in that: A guide nozzle having the function of guiding molten steel is inserted into the guide hole in the center of the spray plate cover.

3. The aerosol spray disc with self-adaptive spray gap adjustment for powder preparation according to claim 1, characterized in that: The upper and lower side walls of the spray plate seat are respectively provided with high-pressure air inlet holes and ceramic sealing electrode holes.

4. The spray gap adaptively adjustable aerosol spray disc for powder preparation according to claim 1, characterized in that: The diameter of the guide hole of the spray disc cover is smaller than the diameter of the internal thread hole and the guide hole of the spray disc bottom.

5. The aerosol spray disc with self-adaptive spray gap adjustment for powder preparation according to claim 1, characterized in that: The high-pressure air cavity formed among the spray disc cover, the spray disc seat and the spray disc bottom is sealed by pressing the contact surfaces among the three; or by machining a rubber ring groove on the contact surface and sealing with a rubber ring; or by applying sealing glue on the contact surface or pressing softer metal to achieve sealing.

6. The aerosol spray disc with self-adaptive spray gap adjustment for powder preparation according to claim 1, characterized in that: A spring with elastic connection is evenly installed along the circumference between the lower end surface of the spray disc cover guide shaft of the spray disc cover and the upper end surface of the spray disc bottom guide shaft of the spray disc bottom, and a preload force is applied between the spray disc cover and the spray disc bottom through the spring.

7. The aerosol spray disc with self-adaptive spray gap adjustment for powder preparation according to claim 1, characterized in that: The gap of the coupled air blade annular gap is adjusted by adjusting the thread pair between the spray disc cover and the spray disc seat. The pitch of the coupled air blade annular gap changes by one thread pitch each time the thread rotates one circle.

8. The gas atomizing spray disc with self-adaptive spray gap adjustment for powder preparation according to claim 7, characterized in that: A spray disc seat scale is engraved on the upper end surface of the spray disc seat, and a pointer corresponding to the spray disc seat scale is engraved on the upper end of the spray disc cover.

9. The aerosol spray disc with self-adaptive spray gap adjustment for powder preparation according to claim 1, characterized in that: Pressure sensitive material is evenly installed along the circumference between the lower end surface of the spray disc cover guide shaft of the spray disc cover and the upper end surface of the spray disc bottom guide shaft of the spray disc bottom, and a ceramic sealed electrode is installed in the ceramic sealed electrode hole on the side wall of the spray disc seat to lead out the pressure signal of the pressure sensitive material through the ceramic sealed electrode.

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