Cooling device for metal powder

Abstract

The utility model provides a cooling device for metal powder, which relates to the technical field of metal powder production equipment and is characterized in that a powder collecting tank adopts a double-layer tank body structure with an interlayer, and rotating shafts are fixedly arranged on two opposite sides of the outer wall of the powder collecting tank respectively; the bracket is used for supporting the powder collecting tank, and the two rotating shafts are rotatably mounted on the bracket; the driving mechanism is installed on the support, the driving mechanism is connected with a rotating shaft and drives the powder collecting tank to rotate through the rotating shaft, the rotating joint comprises a fixed part and a rotating part which are in rotating fit, the rotating part is coaxially installed on the rotating shaft and synchronously rotates along with the rotating shaft, and the rotating part is provided with a rotating liquid inlet and a rotating liquid outlet; the fixed component is provided with a fixed liquid inlet and a fixed liquid outlet which are connected with an external pipeline, the fixed liquid inlet is communicated with the rotary liquid inlet, the fixed liquid outlet is communicated with the rotary liquid outlet, and the rotary liquid inlet and the rotary liquid outlet are respectively communicated with the interlayer of the powder collecting tank through connecting pipes. The cooling device can improve the cooling efficiency of the metal powder.

Description

Technical Field

[0001] This utility model relates to the technical field of metal powder production equipment, and in particular to a cooling device for metal powder. Background Technology

[0002] Metal powders are aggregates of tiny metal particles, typically ranging in size from 0.1 to 1000 micrometers. They are core raw materials for advanced manufacturing technologies such as powder metallurgy, additive manufacturing (3D printing), and metal injection molding. The high-temperature metal powder needs to be cooled during its preparation.

[0003] Traditional cooling methods involve static water cooling within the powder collection tank, resulting in long cooling times and low efficiency. Furthermore, because both the collection tank and the powder within it are stationary, the cooling water cannot fully contact the powder, leading to excessively high powder temperatures in the center of the tank and poor cooling performance. For example, a 100kg-class atomization device requires 4-6 hours to cool powder using conventional static water cooling.

[0004] However, with the rapid development of the additive manufacturing market, the demand for metal powder is constantly increasing, and the production scale of metal powder is also expanding rapidly. The amount of metal powder produced in a single batch has increased from 100kg-150kg to 1000kg-2000kg. If traditional cooling technology is still used, the cooling time will increase significantly, which will seriously affect the production efficiency of metal powder.

[0005] In addition, traditional cooling methods are difficult to guarantee the cooling quality of metal powders and cannot achieve a sealed environment. Metal powders are easily exposed to air during the cooling stage, which leads to oxidation, resulting in yellowing and performance degradation. Large-diameter powders are also prone to agglomeration and clumping during the cooling process, affecting the final quality of the metal powder.

[0006] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a cooling device for metal powder through repeated experiments in order to solve the problems existing in the prior art. Utility Model Content

[0007] The purpose of this invention is to provide a cooling device for metal powder that can effectively improve the cooling efficiency of metal powder.

[0008] To achieve the above objectives, this utility model proposes a cooling device for metal powder, wherein the cooling device comprises:

[0009] The powder collecting tank has an axially through powder collecting cavity, and valves are respectively provided at both ends of the powder collecting cavity. The powder collecting tank adopts a double-layer tank structure with a jacket, and rotating shafts are respectively fixed on opposite sides of the outer wall of the powder collecting tank.

[0010] A bracket for supporting the powder collection tank, and the two rotating shafts are rotatably mounted on the bracket;

[0011] A drive mechanism is mounted on the bracket, and the drive mechanism is connected to a rotating shaft and drives the powder collection tank to rotate through the rotating shaft;

[0012] A rotary joint includes a fixed component and a rotating component that are rotatably fitted together. The rotating component is coaxially mounted on a rotating shaft and rotates synchronously with the rotating shaft. The rotating component has a rotary inlet and a rotary outlet. The fixed component has a fixed inlet and a fixed outlet that are connected to an external pipeline. The fixed inlet is connected to the rotary inlet, and the fixed outlet is connected to the rotary outlet. The rotary inlet and the rotary outlet are respectively connected to the jacket of the powder collection tank through connecting pipes.

[0013] As described above, in the cooling device for metal powder, the fixed component is a bushing, the rotating component is an inner shaft passing through the bushing, one end of the inner shaft is connected to the rotating shaft, the fixed liquid inlet and the fixed liquid outlet respectively penetrate the side wall of the bushing, the outer wall of the inner shaft is provided with an outlet annular groove that aligns with the fixed liquid outlet and an inlet annular groove that aligns with the fixed liquid inlet, the inner shaft is provided with an inlet channel and an outlet channel, one end of the inlet channel is connected to the inlet annular groove, the other end of the inlet channel is opened at the end of the inner shaft and forms the rotating liquid inlet, one end of the outlet channel is connected to the outlet annular groove, and the other end of the outlet channel is opened at the end of the inner shaft and forms the rotating liquid outlet.

[0014] In the cooling device for metal powder described above, a plurality of sealing rings are provided between the bushing and the inner shaft, and the sealing rings are respectively provided on both sides of the fixed liquid inlet, on both sides of the fixed liquid outlet, and between the fixed liquid inlet and the fixed liquid outlet.

[0015] In the cooling device for metal powder described above, bearings are installed at both ends of the bushing, and the inner shaft is rotatably engaged with the bushing via two of the bearings.

[0016] In the cooling device for metal powder described above, the inner shaft is fixedly connected to the rotating shaft via a connecting assembly, the connecting assembly comprising:

[0017] A flange is fixedly connected to the end face of the inner shaft;

[0018] A connecting plate is arranged parallel to and spaced apart from the flange;

[0019] At least two support plates are provided between the flange and the connecting plate, with one end of each support plate fixedly connected to the flange and the other end of each support plate fixedly connected to the connecting plate.

[0020] The rotating shaft is fixedly connected to the connecting plate.

[0021] As described above, in the cooling device for metal powder, the connecting plate includes a detachably connected connecting plate body and a first pressure plate. The connecting plate body and the first pressure plate are respectively provided with semi-circular grooves for alignment and mating. The two semi-circular grooves form a circular hole-shaped mounting groove. The end of the rotating shaft is inserted into the mounting groove. A positioning pin passes through the connecting plate body, the rotating shaft and the first pressure plate in sequence and fixes the connecting plate body, the rotating shaft and the first pressure plate together.

[0022] In the cooling device for metal powder described above, the connecting plate body and the first pressure plate are detachably connected by a plurality of bolt assemblies.

[0023] In the cooling device for metal powder described above, the drive mechanism is connected to the rotating shaft via the rotary joint.

[0024] The cooling device for metal powder described above, wherein the driving mechanism is an electric motor.

[0025] In the cooling device for metal powder described above, the outer walls at both ends of the powder collecting tank are respectively provided with a tank inlet and a tank outlet communicating with the interlayer. The tank inlet and the rotary inlet, as well as the tank outlet and the rotary outlet, are respectively connected by the connecting pipe.

[0026] Compared with the prior art, the present invention has the following features and advantages:

[0027] The present invention proposes a cooling device for metal powder. A drive mechanism rotates the entire powder collection tank, causing the metal powder inside to continuously tumble and disperse during cooling. This breaks away from the "localized heat accumulation" (such as difficulty in cooling the powder in the middle) of traditional static cooling, ensuring rapid and uniform cooling of the powder and preventing it from clumping due to heat. Simultaneously, the fixed component of the rotary joint is fixed to ensure that the external pipeline connected to the fixed component is also in a fixed state. The rotating component rotates synchronously with the powder collection tank, and the positions of the rotating inlet and outlet on the rotating component relative to the powder collection tank are relatively fixed. This prevents the connecting pipe between the rotating component and the powder collection tank from tangling or breaking. The cooling medium circulates between the jacket and the external pipeline through the connecting pipe, improving the cooling effect of the powder collection tank on the metal powder. Attached Figure Description

[0028] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0029] Figure 1 This is an external view of the cooling device for metal powder proposed in this utility model;

[0030] Figure 2 This is a schematic diagram of the cooling device for metal powder in this utility model;

[0031] Figure 3 This is a perspective view of the cooling device for metal powder in this utility model;

[0032] Figure 4 This is a schematic diagram of the rotary joint in this utility model.

[0033] Explanation of reference numerals in the attached figures

[0034] 100. Cooling device; 1. Fixed inlet; 2. Right support; 3. Fixed component; 4. Right bearing; 5. Rotating component; 6. Drive mechanism; 7. Right cover plate; 8. Right sealing ring; 9. Middle sealing ring; 10. Fixed outlet; 11. Left sealing ring; 12. Left bearing; 13. Flange; 14. Powder collection tank; 15. Upper butterfly valve; 16. Tank outlet; 17. Second pressure plate; 18. Lower butterfly valve; 19. Tank inlet; 20. Rotating inlet; 21. Rotating outlet; 22. Positioning pin; 23. First pressure plate; 24. Bracket; 25. Jacket; 26. Rotating shaft; 27. Outlet ring groove; 28. Inlet ring groove; 30. Inlet channel; 31. Connecting plate; 32. Support plate; 33. Left support. Detailed Implementation

[0035] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0036] like Figure 1 As shown, this utility model proposes a cooling device 100 for metal powder, the cooling device 100 comprising:

[0037] The powder collection tank 14 has an axially through powder collection chamber, and valves are respectively provided at both ends of the powder collection chamber. The powder collection tank 14 adopts a double-layer tank structure with a jacket 25. Rotating shafts 26 are respectively fixed on opposite sides of the outer wall of the powder collection tank 14.

[0038] A bracket 24 is used to support the powder collection tank 14, and two rotating shafts 26 are rotatably mounted on the bracket 24;

[0039] The drive mechanism 6 is connected to a rotating shaft 26 and drives the powder collection tank 14 to rotate through the rotating shaft 26;

[0040] The rotary joint includes a fixed component 3 and a rotating component 5 that are rotatably fitted. The rotating component 5 is coaxially connected to a rotating shaft 26 and rotates synchronously with the rotating shaft 26. The rotating component 5 has a rotating liquid inlet 20 and a rotating liquid outlet 21. The fixed component 3 has a fixed liquid inlet 1 and a fixed liquid outlet 10 that are connected to an external pipeline. The fixed liquid inlet 1 is connected to the rotating liquid inlet 20, and the fixed liquid outlet 10 is connected to the rotating liquid outlet 21. The rotating liquid inlet 20 and the rotating liquid outlet 21 are respectively connected to the jacket 25 of the powder collection tank 14 through connecting pipes.

[0041] The present invention proposes a cooling device 100 for metal powder. The driving mechanism 6 drives the entire powder collection tank 14 to rotate. During the cooling process, the metal powder in the powder collection tank 14 is continuously agitated and dispersed, breaking the "local heat accumulation" (such as difficulty in cooling the middle powder) of traditional static cooling. This ensures that the powder can be cooled quickly and evenly, and avoids the powder from clumping due to heat. At the same time, the fixing part 3 of the rotary joint is fixed to ensure that the external pipeline connected to the fixing part 3 is also in a fixed state. The rotating part 5 rotates synchronously with the powder collection tank 14. The rotating liquid inlet 20 and rotating liquid outlet 21 on the rotating part 5 are relatively fixed in position with the powder collection tank 14, which avoids the connecting pipe between the rotating part 5 and the powder collection tank 14 from getting tangled and twisted. The cooling medium is circulated between the jacket 25 and the external pipeline through the connecting pipe, which improves the cooling effect of the powder collection tank 14 on the metal powder.

[0042] The present invention proposes a cooling device 100 for metal powder, in which each metal powder in the powder collection tank 14 can make more full contact with the inner wall surface (cooling surface) of the powder collection tank 14, and through the above-mentioned rapid cooling process, the temperature of the metal powder can be quickly reduced to below the easily oxidized range.

[0043] The present invention proposes a cooling device 100 for metal powder. During the rotation of the powder collection tank 14, the metal powder is in a dynamic and loose state, and will not form agglomerates due to local overheating or uneven cooling, thus ensuring uniform particle size distribution and meeting the flowability (Hall flow rate usually needs to be ≤20s / 50g).

[0044] The present invention proposes a cooling device 100 for metal powder, and a powder collection tank 14 that is compatible with a larger volume cooling cavity. It can match the gas atomization powder production capacity of 1000-2000kg per furnace, solve the bottleneck of traditional static cooling for small batches and slow turnover, and meet the large-volume demand for powder in the additive manufacturing industry.

[0045] The cooling device 100 for metal powder proposed in this utility model can achieve efficient cooling of metal powder, reduce the consumption of cooling media (such as circulating water and inert gas), and at the same time, the shortened cooling cycle improves the equipment turnover rate, indirectly reducing the production cost per unit of powder.

[0046] In an optional embodiment of this utility model, the fixing component 3 is a bushing, and the rotating component 5 is an inner shaft passing through the bushing. One end of the inner shaft is connected to the rotating shaft 26. The fixed liquid inlet 1 and the fixed liquid outlet 10 respectively penetrate the side wall of the bushing. The outer wall of the inner shaft is provided with an outlet ring groove 27 that aligns with the fixed liquid outlet 10 and an inlet ring groove 28 that aligns with the fixed liquid inlet 1. The inner shaft is provided with an inlet channel 30 and an outlet channel. One end of the inlet channel 30 is connected to the inlet ring groove 28, and the other end of the inlet channel 30 is opened at the end of the inner shaft to form a rotating liquid inlet 20. One end of the outlet channel is connected to the outlet ring groove 27, and the other end of the outlet channel is opened at the end of the inner shaft to form a rotating liquid outlet 21. With the above structure, the cooling medium enters the corresponding inlet ring groove 28 from the fixed inlet 1 of the bushing. Since the inlet ring groove 28 is a 360-degree groove, it ensures that the fixed inlet 1 and the inlet ring groove 28 remain connected while the inner shaft is rotating. The inlet ring groove 28 is connected to the inlet channel 30 inside the inner shaft. The cooling medium flows along the inlet channel 30 to the rotating inlet 20 at the end of the inner shaft and then out, finally entering the jacket 25 of the powder collection tank 14 through the connecting pipe. The outflow path of the cooling medium is from the jacket 25 through another connecting pipe, the rotating outlet 21, the outlet channel, the outlet ring groove 27, and the fixed outlet 10. Throughout the cooling process, the inner shaft rotates synchronously with the powder collection tank 14, while the bushing remains fixed. This allows the cooling medium to continuously cool the rotating powder collection tank 14 without stopping the machine or tangling, thus efficiently and uniformly cooling the metal powder.

[0047] In an optional example of this embodiment, multiple sealing rings are provided between the bushing and the inner shaft. Sealing rings are provided on both sides of the fixed liquid inlet 1, on both sides of the fixed liquid outlet 10, and between the fixed liquid inlet 1 and the fixed liquid outlet 10, so as to effectively ensure the sealed connection between the fixed liquid inlet 1 and the liquid inlet ring groove 28, and between the fixed liquid outlet 10 and the liquid outlet ring groove 27.

[0048] In an optional example, three sealing rings are provided between the bushing and the inner shaft. The three sealing rings are a right sealing ring 8, a middle sealing ring 9, and a left sealing ring 11. A fixed liquid inlet 1 is provided between the right sealing ring 8 and the middle sealing ring 9, and a fixed liquid outlet 10 is provided between the middle sealing ring 9 and the left sealing ring 11.

[0049] In one optional example of this embodiment, a left bearing 12 and a right bearing 4 are respectively installed at both ends of the bushing, and the inner shaft rotates with the bushing through the left bearing 12 and the right bearing 4.

[0050] In an optional example of this embodiment, the inner shaft is fixedly connected to the rotating shaft 26 via a connecting assembly, the connecting assembly including:

[0051] Flange 13 is fixedly connected to the end face of the inner shaft;

[0052] The connecting plate 31 is arranged parallel to and spaced apart from the flange 13;

[0053] At least two support plates 32 are supported between the flange 13 and the connecting plate 31. One end of each support plate 32 is fixedly connected to the flange 13, and the other end of each support plate 32 is fixedly connected to the connecting plate 31.

[0054] The rotating shaft 26 is fixedly connected to the connecting plate 31.

[0055] An open space is created between the end face of the inner shaft and the rotating shaft 26 by means of a connecting component, so that the connecting pipe can be connected to the rotating inlet 20 and the rotating outlet 21 located at the center of the end face of the inner shaft through the open space.

[0056] In an optional example, the connecting plate 31 includes a detachably connectable connecting plate body and a first pressure plate 23. The connecting plate body and the first pressure plate 23 each have a semi-circular groove for alignment. The two semi-circular grooves form a circular mounting groove. The end of the rotating shaft 26 is inserted into the mounting groove. A positioning pin 22 passes through the connecting plate body, the rotating shaft 26, and the first pressure plate 23 in sequence, fixing the connecting plate body, the rotating shaft 26, and the first pressure plate 23 together. With this structure, the rotating shaft 26 can be quickly connected to the connecting plate 31.

[0057] In an optional example, the connecting plate body and the first pressure plate 23 are detachably connected by a plurality of bolt assemblies.

[0058] In an alternative example, the bracket 24 has a right support portion 2 and a left support portion 33 spaced apart, which are rotatably connected to two rotating shafts 26 respectively.

[0059] Furthermore, the rotary joint is mounted on the right support 2 and pressed together by the right cover plate 7.

[0060] In an optional example, a second pressure plate 17 is detachably connected to the left support 33. The left support 33 and the second pressure plate 17 are respectively provided with semi-circular grooves for matching. The two semi-circular grooves form a circular mounting groove. The end of the rotating shaft 26 is rotatably inserted into the mounting groove for rotating the rotating shaft 26 and flipping the powder collection tank 14.

[0061] Furthermore, the diameter of the aforementioned semi-circular groove is larger than the diameter of the rotating shaft 26.

[0062] In an optional embodiment of this utility model, the drive mechanism 6 is connected to the rotating shaft 26 via a rotary joint.

[0063] In one optional embodiment of this utility model, the drive mechanism 6 is a motor.

[0064] In an optional embodiment of this invention, the outer walls at both ends of the powder collecting tank 14 are respectively provided with a tank inlet 19 and a tank outlet 16 communicating with the interlayer 25. The tank inlet 19 and the rotary inlet 20, as well as the tank outlet 16 and the rotary outlet 21, are connected by connecting pipes. With this structure, the tank outlet 16 and the tank inlet 19 are located at both ends of the powder collecting tank 14, increasing the flow path and time of the cooling medium within the interlayer 25, thereby improving the circulation efficiency of the cooling medium.

[0065] In one optional example of this implementation, the connecting pipe is a flexible hose.

[0066] In an optional embodiment of this utility model, the valves at both ends of the powder collection tank 14 are an upper butterfly valve 15 and a lower butterfly valve 18, respectively. The powder collection chamber is sealed by the upper butterfly valve 15 and the lower butterfly valve 18. Through the above-mentioned sealing design, the oxygen content of the metal powder can be controlled below 0.0002%, avoiding oxidation and deterioration caused by long-term exposure to high temperature.

[0067] Please refer to Figures 1 to 4 The specific implementation process of the cooling device 100 for metal powder proposed in this utility model.

[0068] In this embodiment, 2000 kg of metal powder is loaded into the powder collection tank 14. The upper butterfly valve 15 and the lower butterfly valve 18 are closed. The fixed liquid outlet 10 is connected to the outside. The rotating liquid inlet 20 is connected to the liquid inlet 19 of the tank body through a hose. The liquid outlet 16 of the tank body is connected to the rotating liquid outlet 21 through a hose. The fixed liquid inlet 1 is connected to the outside. The second pressure plate 17 and the first pressure plate 23 are flipped. After fixing the powder collection tank 14, the positioning pin 22 on the first pressure plate 23 is assembled. The second pressure plate 17 can be fitted with a buckle for fixing the left support part 33. The external water source is turned on and the motor is turned on. The powder collection tank 14 is rotated evenly and begins to cool while rotating. After 1 hour, the motor is turned off. The metal powder is discharged through the lower butterfly valve 18 and waits for the next batch of material to be directly loaded from the upper butterfly valve 15 for mixing.

[0069] In this embodiment, the efficiency of the cooling device 100 is greatly increased compared to the traditional powder collection tank. For a detailed comparative analysis, please refer to the table below.

[0070]

[0071] The present invention proposes a cooling device 100 for metal powder, which uses dynamic water cooling in the powder collection tank 14. This effectively solves the problems of long cooling waiting time, low efficiency, insufficient contact between cooling water and powder, excessively high intermediate powder temperature, and poor cooling effect.

[0072] The present invention proposes a cooling device 100 for metal powder, and a powder collection tank 14 that provides fast cooling efficiency for metal powder and reduces water and electricity costs.

[0073] The present invention proposes a cooling device 100 for metal powder, which has an independent structural design, is easy to install and disassemble, convenient to operate, has a simple process flow, high safety, and simple and practical device parts design, and is easy to clean.

[0074] The cooling device 100 for metal powder proposed in this invention solves the problem of easy oxidation of metal powder during the high-temperature cooling stage, effectively controls and reduces oxygen content, and meets printing requirements. The metal powder processed by the cooling device 100 proposed in this invention has good quality indicators, high chemical purity, narrow particle size distribution, low oxygen content, and good flowability.

[0075] The present invention proposes a cooling device 100 for metal powder, which solves the problems of slow solidification and cooling of molten metal after it is atomized into fine droplets, slow powder cooling, difficulty in timely powder discharge, sieving and packaging, and relatively low production efficiency.

[0076] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A cooling device for metal powder, characterized by, The cooling device comprises: A powder collecting tank with an axially-through powder collecting cavity, two ends of the powder collecting cavity are respectively provided with valves, the powder collecting tank adopts a double-layer tank body structure with a sandwich, opposite sides of an outer wall of the powder collecting tank are respectively fixedly provided with rotating shafts; A support for supporting the powder collecting tank, the two rotating shafts are rotatably installed on the support; A driving mechanism installed on the support, the driving mechanism is connected with one of the rotating shafts and drives the powder collecting tank to rotate through the rotating shaft; A rotary joint comprising a rotatingly-fitted fixed part and a rotating part, the rotating part is coaxially installed on one of the rotating shafts and rotates synchronously with the rotating shaft, the rotating part has a rotating liquid inlet and a rotating liquid outlet, the fixed part has a fixed liquid inlet and a fixed liquid outlet connected with external pipelines, the fixed liquid inlet is communicated with the rotating liquid inlet, the fixed liquid outlet is communicated with the rotating liquid outlet, the rotating liquid inlet and the rotating liquid outlet are respectively communicated with the sandwich of the powder collecting tank through connecting pipes.

2. The cooling device for metal powder according to claim 1, wherein The fixed part is a shaft sleeve, the rotating part is an inner shaft penetrating in the shaft sleeve, one end of the inner shaft is connected with the rotating shaft, the fixed liquid inlet and the fixed liquid outlet respectively penetrate the side wall of the shaft sleeve, an outer wall of the inner shaft is provided with a liquid outlet annular groove matched with the fixed liquid outlet and a liquid inlet annular groove matched with the fixed liquid inlet, the inner shaft is provided with a liquid inlet channel and a liquid outlet channel, one end of the liquid inlet channel is connected with the liquid inlet annular groove, the other end of the liquid inlet channel is provided on the end of the inner shaft and forms the rotating liquid inlet, one end of the liquid outlet channel is connected with the liquid outlet annular groove, the other end of the liquid outlet channel is provided on the end of the inner shaft and forms the rotating liquid outlet.

3. The cooling device for metal powder according to claim 2, wherein A plurality of sealing rings are arranged between the shaft sleeve and the inner shaft, the two sides of the fixed liquid inlet, the two sides of the fixed liquid outlet and between the fixed liquid inlet and the fixed liquid outlet are respectively provided with the sealing rings.

4. The cooling device for metal powder according to claim 2, wherein Bearing is installed on both ends of the shaft sleeve, the inner shaft is rotatably fitted with the shaft sleeve through the two bearings.

5. The cooling device for metal powder according to claim 2, wherein The inner shaft is fixedly connected with the rotating shaft through a connecting assembly, the connecting assembly comprises: A flange plate fixedly connected with the end face of the inner shaft; A connecting plate arranged in parallel and spaced apart from the flange plate; At least two support plates supported between the flange plate and the connecting plate, one end of each support plate is fixedly connected with the flange plate, the other end of each support plate is fixedly connected with the connecting plate; The rotating shaft is fixedly connected on the connecting plate.

6. The cooling device for metal powder according to claim 5, wherein The connecting plate comprises a connecting plate body and a first pressing plate which are detachably connected, the connecting plate body and the first pressing plate are respectively provided with half-circular grooves matched in position, the two half-circular grooves are enclosed into a circular hole-shaped mounting slot, the end of the rotating shaft is inserted into the mounting slot, a positioning pin penetrates the connecting plate body, the rotating shaft and the first pressing plate in sequence and fixes the connecting plate body, the rotating shaft and the first pressing plate together.

7. The cooling device for metal powder according to claim 6, wherein The connecting plate body and the first pressing plate are detachably connected through a plurality of bolt assemblies.

8. The cooling device for metal powder according to claim 1 or 2, wherein The driving mechanism is connected with the rotating shaft through the rotating joint.

9. The cooling device for metal powder according to claim 8, wherein The driving mechanism is an electric motor.

10. The cooling device for metal powder according to claim 1, wherein Outer walls at two ends of the powder collecting tank are respectively provided with a tank liquid inlet and a tank liquid outlet which are communicated with the interlayer, and the tank liquid inlet and the rotating liquid inlet and the tank liquid outlet and the rotating liquid outlet are connected through the connecting pipes respectively.

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