A liquid deposition coating device for metal powder and its coating process

Abstract

This invention discloses a liquid deposition coating device and process for metal powder, relating to the field of metal powder surface modification technology. It aims to solve the technical problem of uneven distribution of powder and grinding media within a drum due to the presence of the material's natural angle of repose. The device includes two support pipes, a drum, a wave-sequence pushing mechanism, and a rolling assembly arranged inside the drum. This invention uses the sequential action of the wave-sequence pushing mechanism to form a mechanical peristaltic wave that propagates from both ends to the middle within the drum, forcibly breaking the material's angle of repose and solving the "dead zone" problem of material accumulation at the ends of traditional drums. This achieves uniform mixing and efficient conveying throughout the entire drum axis. Combined with the dynamic screening and agglomeration effect of the rolling assembly, the distribution of grinding media and energy transfer path are optimized, transforming disordered collisions into ordered concentrated shearing. This significantly improves the sphericity, sphericity, and surface smoothness of the coated powder, and effectively prevents over-grinding.

Description

Technical Field

[0001] This invention relates to the field of metal powder surface modification technology, and more specifically, to a liquid deposition coating device for metal powder and its coating process. Background Technology

[0002] In the drying and spheroidizing stages of coated powder, traditional equipment often uses high-speed rotating drums in conjunction with grinding media (such as agate balls) for physical ball milling. However, this "passive tumbling" mode, which relies on gravity and centrifugal force, has significant drawbacks. Due to the existence of the material's natural angle of repose, the powder and grinding media easily form stable accumulation "dead zones" at both ends of the drum, resulting in extremely uneven axial distribution of the material. This macroscopic uneven mixing not only reduces the effective volume utilization rate of the equipment but also causes excessive friction on the material near the drum wall and ends, while the material in the central area is not fully mixed. In addition, traditional disordered collisions are difficult to provide sufficient directional shear force, resulting in low spheroidizing efficiency, high energy consumption, and a high risk of over-grinding of fine powder and uncontrolled temperature rise.

[0003] In conventional mechanical ball milling, the mixed state of the grinding media (agate balls) and powder often lacks effective dynamic intervention. During drum rotation, coarse and fine media and powder often intertwine, making it difficult to achieve on-demand aggregation and effective stratification. This leads to two problems: first, a waste of mechanical energy, as the dispersed media cannot form a concentrated shear force field, and a large amount of energy is consumed in disordered collisions and friction; second, difficulty in sorting, when attempting to solve the precipitation of binder components during high-speed mixing (e.g., 2000 rpm), it is impossible to effectively distinguish undissolved precipitates from qualified powders, resulting in significant challenges for subsequent fluidized bed airflow classification. Therefore, we propose a liquid deposition coating device and its coating process for metal powders. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid deposition coating device and coating process for metal powder, so as to solve the technical problem that the powder and grinding media are easily unevenly distributed in the drum due to the existence of the natural angle of repose of the material.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a liquid deposition coating device for metal powder, comprising two support tubes, a roller, a wave-sequence feeding mechanism and a rolling assembly arranged inside the roller; The wave sequence feeding mechanism includes: Two support plates are fixedly connected by a rotating shaft; Two fixed plates are arranged at the center of the axis of rotation; A central plate located between two fixed plates and rotatably fitted onto the surface of the rotating shaft; Several material pushing components are symmetrically arranged on both sides of the central plate, and the material pushing components are arranged linearly. Each of the aforementioned pusher components includes a left end plate and a right end plate fixedly connected by a cover plate. A T-shaped channel is arranged on both the left end plate and the right end plate. A guide rod is inserted into one side of the right end plate and passes through the confluence cavity of the T-shaped channel, located between the left end plate and the right end plate. A pusher plate is rotatably sleeved on the surface of the rotating shaft. When gas is conveyed into the confluence cavity through the T-shaped channel, the gas pressure acts on the guide rod, causing the guide rod to overcome resistance and drive the pusher plate to rotate. A wave sequence valve module is arranged between each of the two adjacent right end plates, and the wave sequence valve module is arranged coaxially with the cross flow channel on the T-shaped channel, so that the cross flow channel on each T-shaped channel forms an independent channel. When filling the T-shaped channel with gas, the guide rod drives the pusher plate to rotate. When the gas pressure in the channel increases to a set threshold, the wave sequence valve module opens, and the gas flows into the next T-shaped channel, driving the pusher plate to rotate and forming a peristaltic wave motion pattern. This conveys particles and spheres located at both ends of the repose angle towards the center. This invention, through the sequential action of the wave sequence pushing mechanism, forms a mechanical peristaltic wave that propagates from both ends to the middle within the drum, forcibly breaking the material's repose angle. This solves the "dead zone" problem of material accumulation at the ends of traditional drums, achieving uniform mixing and efficient conveying throughout the entire drum axis. Combined with the dynamic screening and agglomeration effect of the rolling component, the distribution of grinding media and the energy transfer path are optimized, transforming disordered collisions into ordered concentrated shearing. This significantly improves the spheroidization efficiency, sphericity, and surface smoothness of the coated powder, and effectively prevents over-grinding, ultimately achieving efficient and stable preparation of high-quality metal-coated powder.

[0006] Preferably, the roller is rotatably mounted on the surface of two support tubes via bearings. Each support tube has a pre-embedded air supply pipe and a pre-embedded exhaust pipe arranged on its wall thickness. Each support plate has an air inlet pipe and an air outlet pipe fixedly connected to one side, and the air inlet pipe is connected to the pre-embedded air supply pipe and the air outlet pipe is connected to the pre-embedded exhaust pipe.

[0007] Preferably, each of the pusher components further includes a secondary tube, which connects two T-shaped channels on the left end plate and the right end plate. The pusher plate is provided with a window, and the inner walls on both sides of the window are provided with waist-shaped grooves, and the insert rod on the guide rod is slidably adapted to the inside of the waist-shaped groove.

[0008] Preferably, the wave sequence valve module includes an outer spherical shell, which is connected to the crossflow channel on the T-shaped channel, and a ring with a sandwich layer is sleeved inside the outer spherical shell.

[0009] Preferably, a plurality of limiting rods are fixedly connected in a ring array within the interlayer of the ring, and a valve plate is slidably sleeved inside the ring, with the plurality of limiting rods penetrating the valve plate.

[0010] Preferably, each of the limiting rods is fitted with a first spring, and the first spring is elastically adapted to the valve plate.

[0011] Preferably, the roller assembly includes a plurality of guide rods arranged in a circular array on the surface of the roller, and each guide rod is rotatably connected to two movable rods, which pass through the wall thickness of the roller.

[0012] Preferably, hollow tubes are fixedly connected to the ends of the two movable rods, and each hollow tube is fitted with a telescopic rod that is sealed and slidably fitted inside, with the ends of the telescopic rods forming a sealed cavity inside the hollow tube.

[0013] Preferably, the two telescopic rods are connected to a separator rod at one end of their ball joints, the end surface of the roller is fitted with a limit slide rail, and the end of the guide rod is slidably adapted to the sliding path of the limit slide rail.

[0014] A coating process applicable to a liquid deposition coating device for metal powder includes the following steps: S1. Pretreatment and Degassing Dispersion: Micron-sized metal powder is pretreated by spraying a degassing agent and heating it to allow the powder to react fully and remove internal bubbles, providing a clean and uniform solid carrier for subsequent liquid deposition.

[0015] S2, Liquid Deposition and Multilayer Coating: The binder is dissolved in a chemical solvent and liquid phase deposition is carried out under a specific chemical environment.

[0016] S2.1 Dispersed deposition precipitation: The binder is dispersed and deposited on the surface of the metal powder in liquid form to form a preliminary coating layer.

[0017] S2.2 Near-spherical formation: Through multi-layer coating technology, a dense near-spherical coating structure is formed on the surface of metal powder to achieve uniform coating and preliminary spheroidization.

[0018] S3. Drying and ball milling: First, dry the coated powder to remove the solvent in the coating layer, preliminarily solidify the binder layer, lock the coating morphology, and prevent the powder from agglomerating severely in the subsequent ball milling process.

[0019] S3.1, Air pressure wave sequence triggering: Air is supplied to the pre-embedded pipeline of the support pipe. The gas enters the wave sequence valve module. When the air pressure in the T-shaped channel reaches the threshold, it pushes the valve plate to overcome the resistance of the first spring and open, forming an "air path relay". This design makes the air pressure pass through each pusher component in a wave-like manner according to the set sequence.

[0020] S3.2 Push Plate Wave Sequence Action: Pneumatic pressure drives the guide rod to move axially. Through the cooperation of the insert rod and the waist-shaped groove, the linear motion is converted into the oscillation of the push plate around the rotating shaft. Due to the timing control of the wave sequence valve module, all push plates move in sequence, forming a mechanical peristaltic wave transmitted from both ends of the drum to the center.

[0021] S3.3 Forced material convection: Under slow operating conditions, the creeping wave continuously disrupts the material's angle of repose, forcibly pushing the powder and agate balls accumulated at the ends toward the center, eliminating the "dead zone"; under normal operating speed, the arc-shaped surface of the pusher plate intercepts the falling material, transforming its free fall collision into multi-angle shearing impact.

[0022] S3.4 Dynamic Sieving and Media Aggregation: The separator rod utilizes the density and inertia difference between the agate balls and the powder to "sieve" and aggregate the agate balls in real time, forming an orderly rolling layer along the rod body, while the powder flows down from the gaps, achieving preliminary separation and particle size classification; under the subsequent disturbance of the pusher plate, the aggregated agate balls can concentrate and orderly roll, compact, and shear the powder layer below.

[0023] S4. Post-processing and particle size classification: The powder shaped by ball milling enters a high-speed mixer for final homogenization, and then is precisely screened through fluidized bed airflow classification to select finished powders suitable for specific application requirements.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes the sequential action of a wave-sequence feeding mechanism to create a mechanical peristaltic wave within the drum, propagating from both ends towards the center. This forcibly breaks the material's angle of repose, solving the "dead zone" problem of material accumulation at the ends of traditional drums and achieving uniform mixing and efficient conveying throughout the entire drum's axial direction. Combined with the dynamic screening and agglomeration effects of the rolling assembly, the distribution of grinding media and energy transfer paths are optimized, transforming disordered collisions into ordered concentrated shearing. This significantly improves the sphericity, sphericity, and surface smoothness of the coated powder, effectively preventing over-grinding, and ultimately achieving the efficient and stable preparation of high-quality metal-coated powder.

[0025] 2. The core innovation of this invention lies in the wave-sequence pushing mechanism integrated within the agate ball mill mechanism. This mechanism consists of a support plate, a concentrator plate, and multiple pushing components arranged in a linear array. Each pushing component includes a left or right end plate connected by a T-shaped passageway, a guide rod driven by air pressure, and an arc-shaped push plate with a waist-shaped groove. Under the timing control of the wave-sequence valve module, air pressure passes through each T-shaped passageway in sequence, pushing the guide rod to move, thereby driving all push plates to form a mechanical peristaltic wave transmitted from both ends of the drum to the middle. This design fundamentally changes the force and movement mode of the material inside the drum, transforming the traditional "passive tumbling" that relies on gravity and centrifugal force into a program-controllable "active directional transport." It efficiently breaks the end accumulation and mixing dead zone formed by the angle of repose, realizing forced convection and uniform distribution of materials throughout the entire length of the drum, laying the foundation for efficient mixing, heat transfer, and grinding.

[0026] 3. The introduction of the rolling component in this invention produces a significant synergistic enhancement effect with the wave-sequence feeding mechanism. The axial creeping wave generated by the wave-sequence feeding mechanism mainly solves the macroscopic material distribution and conveying problem, while the rolling component, based on this, achieves refined management of the material group at the microscopic level through its guide rod, separator rod, and limiting slide rail structure. Specifically, when the pusher plate of the wave-sequence feeding mechanism pushes the material (including agate balls and powder) towards the central area, the separator rod of the rolling component uses the difference in density and inertia between the two to "sieve" and gather the agate balls in real time, forming an orderly rolling layer along the rod, while the powder flows down from the gaps. This process produces a triple synergistic effect: firstly, functional relay, the wave-sequence feeding mechanism is responsible for "feeding", and the rolling component... The components are responsible for "separation," forming a highly efficient continuous "conveyor-sorter" process. Secondly, energy reuse is achieved. Under the subsequent disturbance of the wave-sequence pushing mechanism's pusher plate, the agate balls, once gathered, can more concentratedly and orderly roll, compact, and shear the powder layer below, improving the utilization efficiency of the mechanical energy input by the wave-sequence pushing mechanism. Thirdly, the effect is multiplied. The wave-sequence pushing mechanism solves the problem of axial unevenness, while the rolling component solves the problem of uneven media distribution and energy dissipation in the radial direction (within the cross-section). The combination of the two achieves global homogenization from "line" to "surface." Finally, the synergistic work of the two ensures that the powder in the drum is in a controlled and efficient motion state in both the axial and radial directions, thus achieving a composite process effect in terms of crushing and agglomeration, improving sphericity, optimizing particle size distribution, and controlling temperature rise. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0028] Figure 2 This is a three-dimensional cross-sectional view of the present invention.

[0029] Figure 3 This is a three-dimensional structural diagram of the feeding component of the present invention.

[0030] Figure 4 This is a schematic diagram of the cross-sectional structure of the left end plate of the present invention, to illustrate the cross-sectional structure of the T-shaped passageway.

[0031] Figure 5 This is a schematic diagram of the cross-sectional structure of the right end plate of the present invention, to illustrate the cross-sectional structure of the T-shaped passageway.

[0032] Figure 6 This is a three-dimensional cross-sectional view of the feeding assembly of the present invention.

[0033] Figure 7 This is a schematic diagram of the three-dimensional partially exploded structure of the feeding assembly of the present invention.

[0034] Figure 8 For the present invention Figure 7The enlarged cross-sectional view at point A in the diagram shows the three-dimensional structure of the wave sequence valve module.

[0035] Figure 9 This is a schematic diagram of the cross-sectional structure of the push plate of the present invention.

[0036] Figure 10 This is a cross-sectional view of the three-dimensional structure of the rolling assembly of the present invention.

[0037] Figure 11 This is a schematic diagram of the three-dimensional structure of the separator rod of the present invention.

[0038] The following are the labels in the diagram: 1. Coating integrated system; 11. Reactor; 12. Drying mechanism; 13. Agate ball mill mechanism; 131. Support tube; 132. Roller; 2. Wave sequence feeding mechanism; 21. Support plate; 22. Fixing plate; 23. Concentrating plate; 3. Feeding assembly; 31. Left end plate; 32. Right end plate; 33. T-shaped passageway; 34. Sub-pipe; 35. Guide rod; 36. Push plate; 361. Waist-shaped groove; 4. Wave sequence valve module; 41. Outer spherical shell; 42. Ring; 43. Valve plate; 44. First spring; 5. Rolling assembly; 51. Guide rod; 52. Hollow tube; 53. Telescopic rod; 54. Separator rod; 55. Limiting slide rail. Detailed Implementation

[0039] Example 1, such as Figures 1-2 As shown, the present invention relates to a liquid deposition coating device for metal powder, comprising a coating integrated system 1. Specifically, the coating integrated system 1 includes a reaction vessel 11, a drying mechanism 12, and an agate ball milling mechanism 13, with the output and input ends of the reaction vessel 11, the drying mechanism 12, and the agate ball milling mechanism 13 connected in sequence. The reaction vessel 11, the drying mechanism 12, and the agate ball milling mechanism 13 are existing conventional technologies and will not be described in detail here. The reaction vessel 11 is used for the dispersion and deposition of micron-sized metal powder. A binder is used to coat the powder surface in multiple layers to form a near-spherical coated powder, achieving uniform coating and preliminary shaping. The coated powder then enters the drying mechanism 12 to remove the solvent and preliminarily solidify the binder layer to prevent powder agglomeration in subsequent processes. Finally, it enters the agate ball milling mechanism 13, which uses smooth agate balls of varying coarseness to ball mill and disperse the powder, breaking up agglomerates and further spheroidizing them to improve the sphericity of the powder and reduce surface roughness.

[0040] like Figure 2 As shown, the agate ball milling mechanism 13 of this embodiment includes two support tubes 131, a roller 132 arranged between the two support tubes 131, a wave-sequence pushing mechanism 2 and a roller-dividing assembly 5 arranged inside the roller 132.

[0041] Specifically, the roller 132 is rotatably mounted on the surface of the two support tubes 131 via bearings. A pulley is arranged at one end of the roller 132. A motor drive mechanism is arranged on the agate ball mill mechanism 13, and a transmission wheel is arranged at its output end. The transmission wheel and the pulley are connected by a transmission belt. Each support tube 131 has a pre-embedded air supply pipe and a pre-embedded exhaust pipe arranged on its wall thickness. Both are connected to the air pump arranged on the agate ball mill mechanism 13. An electronic valve is arranged at the output end of the air pump to control the connection status of the pre-embedded air supply pipe or the pre-embedded exhaust pipe.

[0042] Combination Figures 3-5 and Figure 7 As shown, in this embodiment, the wave-sequence pushing mechanism 2 includes two support plates 21. Each support plate 21 is installed at one end of the support tube 131. The two support plates 21 are fixedly connected by a rotating shaft. Each support plate 21 has an air inlet pipe and an air outlet pipe fixedly connected to one side. The air inlet pipe is connected to the pre-embedded air supply pipe, and the air outlet pipe is connected to the pre-embedded exhaust pipe. Two fixed plates 22 are arranged at the center of the rotating shaft axis. The two fixed plates 22 are fixedly connected by a protective plate. Between the two fixed plates 22, a concentrating plate 23 is rotatably connected to the rotating shaft surface. With the concentrating plate 23 as the axis of symmetry, several pushing components 3 are arranged in a linear array on both sides of it.

[0043] Combination Figures 3-7 and Figure 9As shown, in this embodiment, several pushing components 3 are completely identical in structure and function. Therefore, any one of the pushing components 3 will be described below: The pushing component 3 includes a left end plate 31 and a right end plate 32. The left end plate 31 and the right end plate 32 are fixedly connected by a cover plate. Both the left end plate 31 and the right end plate 32 are provided with T-shaped channels 33. The T-shaped channel 33 on the left end plate 31 is connected to the air outlet pipe. The right end plate 32... The T-shaped channel 33 on the left end plate 31 is connected to the intake pipe. The T-shaped channels 33 on the left end plate 31 and the right end plate 32 are connected through the auxiliary pipe 34. A guide rod 35 is inserted into one side of the right end plate 32 and passes through the confluence cavity of the T-shaped channel 33. The output end of the guide rod 35 is located between the left end plate 31 and the right end plate 32. When gas is delivered into the confluence cavity through the T-shaped channel 33, the gas pressure acts on the guide rod 35, causing the guide rod 35 to... Overcoming resistance, it moves to one side; located between the left end plate 31 and the right end plate 32, a push plate 36 with an arc-shaped surface is rotatably fitted on the surface of the rotating shaft. A window is arranged on the push plate 36, and waist-shaped grooves 361 are opened on the inner walls on both sides of the window. A rod is fixedly connected to the end of the guide rod 35, which is perpendicular to its axis. The rod is a cylindrical pin, and its diameter is matched with the groove width of the waist-shaped groove 361. When the guide rod 35 is driven by air pressure to move linearly along its own axis, the rod slides in the waist-shaped groove 361. Since the waist-shaped groove 361 is a long strip through groove opened on the push plate 36, and its long side direction is perpendicular to the swing plane of the push plate 36, when the rod is pushed linearly, it applies a force to the side wall of the waist-shaped groove 361. This force generates a torque about the axis of rotation, thereby driving the push plate 36 to rotate about the axis of rotation. By changing the length of the waist-shaped groove 361, the maximum swing angle of the push plate 36 can be controlled.

[0044] It is worth noting that when the pusher plate 36 is at its maximum rotation angle, the distance between the end of the pusher plate 36 and the inner wall of the roller 132 is less than the radius of the agate ball, which allows powder or particles to flow through the gap, while the agate ball cannot pass through the gap.

[0045] Specifically, the concentrator plate 23 is fixedly connected to the adjacent push plates 36 on both sides, so that the gas pressure acts on the guide rod 35, causing the guide rod 35 to overcome the resistance and move to one side, thereby pushing the push plate 36 to rotate.

[0046] Combination Figure 8As shown, in this embodiment, a wave sequence valve module 4 is arranged between each pair of adjacent right end plates 32, and the wave sequence valve module 4 is coaxially arranged with the cross flow channel on the T-shaped channel 33; thus, the cross flow channel on each T-shaped channel 33 forms an independent channel; several wave sequence valve modules 4 are completely identical in structure or function, therefore, any one wave sequence valve module 4 will be described in detail below: the wave sequence valve module 4 includes an outer spherical shell 41, the outer spherical shell 41 is connected to the cross flow channel on the T-shaped channel 33, the outer spherical shell 41 is fitted with a ring 42 with a sandwich layer inside the outer spherical shell 41, several limiting rods are fixedly connected in a ring array inside the sandwich layer on the ring 42, a valve plate 43 is slidably fitted inside the ring 42, and several limiting rods pass through the valve plate 43, a first spring 44 is fitted on the surface of each limiting rod, and the first spring 44 is elastically adapted to the valve plate 43; It is worth noting that the valve plate 43 of the wave sequence valve module 4 remains normally closed under the preload of the first spring 44; the preload of the first spring 44 is calibrated and set to 0.2-0.5MPa, which is the "set threshold" mentioned above; when the external air source continuously supplies air through the air inlet pipe, the air pressure in the T-shaped channel 33 gradually increases; when the air pressure exceeds 0.5MPa, the air pressure overcomes the preload of the first spring 44 and pushes the valve plate 43 to move axially along the ring 42, causing the valve plate 43 to separate from the end face of the ring 42, forming an annular gap that allows gas to flow through; since each T-shaped channel 33 is connected in series through the wave sequence valve module 4, and each module is equipped with a spring with the same threshold, the air pressure can only open the valve to enter the next stage after the previous stage channel is filled to the threshold pressure, thereby realizing the time-sequential control of the air pressure being transmitted sequentially along the channel.

[0047] Specifically, when the air pressure inside any T-shaped channel 33 increases, it exerts a force on the valve plate 43, causing the valve plate 43 to move to one side. A flow gap is formed between the valve plate 43 and the ring 42, allowing gas to flow into the next T-shaped channel 33. At this time, the guide rod 35 moves to one side due to the increased air pressure, overcoming resistance, and then pushes the push plate 36 to rotate, causing several push plates 36 to form a peristaltic wave motion pattern that transmits from both ends of the drum 132 to the middle. This wave-sequence pushing mechanism achieves dual-function optimization for different working conditions of the drum 132: when the drum 132 rotates slowly, the material and the agate ball easily form a stable angle of repose at the bottom, resulting in uneven axial mixing. This device continuously disrupts the angle of repose through active axial peristaltic waves, forcibly conveying the material and the ball at both ends to the center, eliminating the "dead zone" at the ends, and achieving uniform mixing and efficient heat transfer with low energy consumption. Under normal operating conditions of the drum 132, the material and the spheres move in a parabolic motion. While the pusher plate 36 of this device is axially creeping, its arc-shaped surface guides and intercepts the falling spheres and particle clusters, transforming free fall collisions into multi-angle shearing impacts, significantly improving the efficiency of agglomerate crushing and spheroidizing effect, and ensuring uniform axial distribution of agate balls, thus ensuring consistent grinding intensity and improving the sphericity and particle size consistency of the final powder.

[0048] The core innovation of this invention lies in the wave-sequence pushing mechanism 2 integrated within the agate ball mill mechanism 13. This mechanism consists of a support plate 21, a concentrating plate 23, and multiple pushing components 3 arranged in a linear array. Each pushing component 3 includes a left end plate 31 or a right end plate 32 connected by a T-shaped channel 33, a guide rod 35 driven by air pressure, and an arc-shaped push plate 36 with a waist-shaped groove 361. Under the timing control of the wave-sequence valve module 4, air pressure passes through each T-shaped channel 33 in sequence, pushing the guide rod 35 to move, thereby driving all the push plates 36 to form a mechanical peristaltic wave transmitted from both ends of the drum 132 to the middle. This design fundamentally changes the force and movement mode of the material in the drum 132, transforming the traditional "passive tumbling" that relies on gravity and centrifugal force into a program-controllable "active directional transport". It efficiently breaks the end accumulation and mixing dead zone formed by the angle of repose, realizing forced convection and uniform distribution of materials throughout the entire length of the drum 132, laying the foundation for efficient mixing, heat transfer, and grinding.

[0049] like Figure 2As shown in the figure, the roller separator assembly 5 of this embodiment includes several guide rods 51, which are arranged in a circular array on the surface of the roller 132. Each guide rod 51 is rotatably connected to two movable rods, which pass through the wall thickness of the roller 132. Hollow tubes 52 are fixedly connected to the ends of the two movable rods, and telescopic rods 53 are slidably fitted inside each hollow tube 52. The ends of the telescopic rods 53 form sealed cavities inside the hollow tubes 52. A separator rod 54 is connected to one end of each telescopic rod 53. A limiting slide rail 55 is sleeved on the end surface of the roller 132, and the ends of the guide rods 51 are slidably fitted into the sliding path of the limiting slide rail 55. The two ends of the separator rod 54 are both unidirectionally hinged, so that when the two telescopic rods 53 move, only one end is connected to the other end. It can swing in the same direction; this structure achieves dynamic separation and agglomerated rolling contact through the density and inertia difference between the agate balls and the powder, and further realizes three key technical effects: First, adaptive particle size classification and anti-over-grinding, through the dynamic variable gap between the separator rod 54 and the inner wall of the roller 132 to form a dynamic screening system, the powder is screened in real time, and qualified fine powder is discharged in time to avoid over-grinding; Second, the kinetic energy optimization and thermal management of the grinding media, by agglomerating the agate balls to form an orderly rolling layer, ineffective collisions are reduced and energy utilization is optimized, while the thin-layer material bed structure improves heat exchange efficiency and assists in temperature control; Third, anti-wall self-cleaning and low-working-condition high-efficiency shearing, the periodic movement of the separator rod 54 has a wall scraping self-cleaning function, and at low speed, a local high-shear zone is constructed to achieve efficient surface polishing.

[0050] The introduction of the roller-separating component 5 in this invention produces a significant synergistic enhancement effect with the wave-sequence pushing mechanism 2. The axial creeping wave generated by the wave-sequence pushing mechanism 2 mainly solves the macroscopic material distribution and conveying problem, while the roller-separating component 5, based on this, achieves refined management of the material group at the microscopic level through its guide rod 51, separator rod 54, and limiting slide rail 55. Specifically, when the push plate 36 of the wave-sequence pushing mechanism 2 pushes the material (including agate balls and powder) towards the central area, the separator rod 54 of the roller-separating component 5 uses the difference in density and inertia between the two to "sieve" and gather the agate balls in real time, forming an orderly rolling layer along the rod, while the powder flows down from the gaps. This process produces a triple synergistic effect: firstly, functional relay, with the wave-sequence pushing mechanism 2 responsible for "feeding". The roller-separating component 5 is responsible for "separation," forming a highly efficient continuous "conveyor-sorter" process. Secondly, energy reuse is achieved. Under the subsequent disturbance of the pusher plate 36 of the wave-sequence pusher mechanism 2, the agate balls, which are gathered together, can more concentratedly and orderly roll, compact, and shear the powder layer below, improving the utilization efficiency of the mechanical energy input by the wave-sequence pusher mechanism 2. Thirdly, the effect is multiplied. The wave-sequence pusher mechanism 2 solves the problem of axial unevenness, and the roller-separating component 5 solves the problem of uneven distribution of media and energy dissipation in the radial direction (within the cross section). The combination of the two achieves global uniformity processing from "line" to "surface." Finally, the synergistic work of the two makes the powder in the roller 132 in a controlled and efficient motion state in both the axial and radial directions, thereby achieving a composite process effect in terms of crushing and agglomeration, improving sphericity, optimizing particle size distribution, and controlling temperature rise.

[0051] Example 2: A coating process for a liquid deposition coating device for metal powder, comprising the following steps: S1. Pretreatment and Degassing Dispersion: Metal powder with an average particle size of 5-50 μm is placed in a fluidized bed reactor; polyethylene glycol (PEG-400) is sprayed at a rate of 0.1-0.5 L / min as a degassing agent, with the amount of degassing agent being 1%-3% of the metal powder mass; then the temperature is raised to 60℃-80℃, and the temperature is maintained while stirring for 30-60 minutes to allow the degassing agent to fully penetrate and promote the escape of residual gas inside the powder, providing a clean and uniform solid support for subsequent liquid deposition.

[0052] S2. Liquid deposition and multilayer coating: The pretreated metal powder is added to the reactor 11, and the binder is dissolved using a chemical solvent. Liquid phase deposition is then carried out under a specific chemical environment.

[0053] S2.1 Dispersed deposition precipitation: The binder is dispersed and deposited on the surface of the metal powder in liquid form to form a preliminary coating layer.

[0054] S2.2 Near-sphere formation: Maintain a specific chemical environment in reactor 11 with a temperature of 50℃-80℃ and a pH of 4-6. First, dissolve polyvinyl alcohol (PVA) in deionized water at a mass concentration of 5%-10% to form a colloidal solution. Then, under stirring at 300-500 rpm, add the pretreated metal powder to the colloidal solution at a mass ratio of 1:2. Stir for 10-20 minutes to form the first coating layer. After the first layer is uniformly attached, add oxalic acid solution with a concentration of 1-2 mol / L to the reactor, adjust the pH to 3-4, and stir for 15-30 minutes to promote flocculation and deposition of the colloid on the powder surface to form the second coating layer. Repeat the above "adsorption-flocculation" steps 2-3 times to form a multi-layer composite coating, and finally form a dense coating layer with a thickness of 0.5-2 μm on the powder surface.

[0055] S3. Drying and ball milling: The coated powder enters the drying unit 12 to remove the solvent in the coating layer, initially solidify the binder layer, lock the coating morphology, and prevent the powder from agglomerating severely in the subsequent ball milling process.

[0056] S3.1, Air pressure wave sequence triggering: The external air pump supplies air through the pre-embedded pipeline of the support pipe 131. The gas enters the wave sequence valve module 4. When the air pressure in the T-shaped channel 33 reaches the threshold, it pushes the valve plate 43 to overcome the resistance of the first spring 44 and open, forming an "air path relay". This design makes the air pressure like a wave, passing through each pusher component 3 in a set order.

[0057] S3.2, Wave sequence action of push plate 36: Pneumatic pressure drives the guide rod 35 to move axially. Through the cooperation of the insert rod and the waist-shaped groove 361, the linear motion is converted into the swing of push plate 36 around the rotating axis. Due to the timing control of wave sequence valve module 4, all push plates 36 move in sequence, forming a mechanical peristaltic wave transmitted from both ends of roller 132 to the center.

[0058] S3.3 Forced material convection: Under slow operating conditions, the creeping wave continuously disrupts the material's angle of repose, forcibly pushing the powder and agate balls accumulated at the ends toward the center, eliminating the "dead zone"; under normal operating speed, the arc-shaped surface of the pusher plate 36 intercepts the falling material, transforming its free fall collision into multi-angle shearing impact.

[0059] S3.4 Dynamic Sieving and Media Aggregation: The separator rod 54 utilizes the density and inertia difference between the agate balls and the powder to "sieve" and aggregate the agate balls in real time, forming an orderly rolling layer along the rod body, while the powder flows down from the gaps, achieving preliminary separation and particle size classification; under the subsequent disturbance of the pusher plate 36, the aggregated agate balls can more concentratedly and orderly roll, compact, and shear the powder layer below, improving the utilization efficiency of mechanical energy and achieving efficient surface polishing.

[0060] S4. Post-processing and particle size classification: The powder shaped by ball milling enters a high-speed mixer for final homogenization, and then is precisely screened through fluidized bed airflow classification to select finished powders suitable for specific application requirements.

[0061] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A liquid deposition coating device for metal powder, characterized in that, It includes two support tubes (131), a roller (132), a wave-sequence pushing mechanism (2) arranged inside the roller (132), and a rolling assembly (5); The wave sequence feeding mechanism (2) includes: Two support plates (21) are connected by a pivot. Two fixed plates (22) are arranged at the center of the axis of rotation; A concentrator plate (23) is fitted at the center of the axis of rotation. Several pusher components (3) are symmetrically arranged on both sides of the central plate (23); Each of the pusher components (3) includes a left end plate (31) and a right end plate (32) fixedly connected by a cover plate. T-shaped channels (33) are arranged on both the left end plate (31) and the right end plate (32). A guide rod (35) is inserted into one side of the right end plate (32), and the guide rod (35) passes through the confluence cavity of the T-shaped channel (33) and is located between the left end plate (31) and the right end plate (32). A pusher plate (36) is rotatably sleeved on the surface of the rotating shaft. When gas is delivered into the confluence cavity through the T-shaped channel (33), the gas pushes the guide rod (35) to overcome the resistance and drive the pusher plate (36) to rotate. A wave sequence valve module (4) is arranged between each of the two adjacent right end plates (32), and the wave sequence valve module (4) is arranged coaxially with the cross flow channel on the T-shaped channel (33); When filling the T-shaped channel (33) with gas, the guide rod (35) drives the push plate (36) to rotate. When the gas pressure in the channel increases, the wave sequence valve module (4) opens, and the gas flows into the next T-shaped channel (33), driving the push plate (36) to rotate again, forming a peristaltic wave motion pattern, which transports the particles and spheres located at both ends of the rest angle to the middle.

2. The liquid deposition coating equipment for metal powder according to claim 1, characterized in that, The roller (132) is rotated and sleeved on the surface of two support pipes (131) by bearings. Each support pipe (131) has a pre-embedded air supply pipe and a pre-embedded exhaust pipe arranged on its wall thickness. Each support piece (21) has a fixed connection to an air inlet pipe and an air outlet pipe on one side, and the air inlet pipe is connected to the pre-embedded air supply pipe and the air outlet pipe is connected to the pre-embedded exhaust pipe.

3. The liquid deposition coating equipment for metal powder according to claim 2, characterized in that, Each of the pusher components (3) also includes a sub-tube (34), which is connected to two T-shaped passageways (33) on the left end plate (31) and the right end plate (32). The pusher plate (36) is provided with a window, and the inner walls on both sides of the window are provided with waist-shaped grooves (361), and the insert rod on the guide rod (35) is slidably adapted to the inside of the waist-shaped groove (361).

4. The liquid deposition coating equipment for metal powder according to claim 3, characterized in that, The wave sequence valve module (4) includes an outer spherical shell (41), which is connected to the crossflow channel on the T-shaped channel (33), and a ring (42) with a sandwich layer is sleeved inside the outer spherical shell (41).

5. The liquid deposition coating equipment for metal powder according to claim 4, characterized in that, The ring (42) has several limiting rods fixedly connected in a ring array inside the interlayer. A valve plate (43) is slidably sleeved inside the ring (42), and the limiting rods pass through the valve plate (43).

6. The liquid deposition coating equipment for metal powder according to claim 5, characterized in that, Each of the limiting rods is fitted with a first spring (44), and the first spring (44) is elastically adapted to the valve plate (43).

7. The liquid deposition coating equipment for metal powder according to claim 6, characterized in that, The roller assembly (5) includes several guide rods (51), which are arranged in a ring array on the surface of the roller (132). Each guide rod (51) is rotatably connected to two movable rods, which pass through the inner wall of the roller (132).

8. The liquid deposition coating equipment for metal powder according to claim 7, characterized in that, The ends of the two movable rods are respectively fixedly connected to hollow tubes (52), and each hollow tube (52) is fitted with a telescopic rod (53) inside, and the end of the telescopic rod (53) forms a sealed cavity inside the hollow tube (52).

9. The liquid deposition coating equipment for metal powder according to claim 8, characterized in that, Two telescopic rods (53) are connected to a separator rod (54) at one end of their ball joints. The end surface of the roller (132) is fitted with a limiting slide rail (55), and the end of the guide rod (51) is slidably adapted to the sliding path of the limiting slide rail (55).

10. A metal powder liquid deposition coating process using the equipment described in claim 9, characterized in that, Includes the following steps: S1. Pretreatment and Degassing Dispersion: Micron-sized metal powder is pretreated by spraying a degassing agent and heating to allow the powder to react fully and remove internal bubbles, providing a clean and uniform solid carrier for subsequent liquid deposition. S2, Liquid Deposition and Multilayer Coating: Using chemical solvents to dissolve the binder and perform liquid phase deposition under a specific chemical environment; S2.1 Dispersed deposition precipitation: The binder is dispersed and deposited in liquid form on the surface of the metal powder to form a preliminary coating layer; S2.2 Near-spherical formation: Through multi-layer coating technology, a dense near-spherical coating structure is formed on the surface of metal powder to achieve uniform coating and preliminary spheroidization; S3. Drying and ball milling: First, dry the coated powder to remove the solvent in the coating layer, preliminarily solidify the binder layer, lock the coating morphology, and prevent the powder from agglomerating severely in the subsequent ball milling process. S3.1, Gas pressure wave sequence triggering: When gas enters the wave sequence valve module (4), the gas pressure in the T-shaped channel (33) reaches the threshold, pushing the valve plate (43) to overcome the resistance of the first spring (44) and open, forming "gas path relay". This design makes the gas pressure like waves, passing through each pusher component (3) in the set order. S3.2, Push plate (36) wave sequence action: pneumatic pressure pushes the guide rod (35) to move axially. Through the cooperation of the insert rod and the waist groove (361), the linear motion is converted into the swing of the push plate (36) around the rotating shaft. Due to the timing control of the wave sequence valve module (4), all push plates (36) move in sequence to form a mechanical peristaltic wave transmitted from both ends of the roller (132) to the center. S3.3 Forced material convection: Under slow operating conditions, the creeping wave continuously destroys the material's angle of repose, forcibly pushing the powder and agate balls accumulated at the ends toward the center, eliminating the "dead zone"; under normal operating speed, the arc surface of the push plate (36) intercepts the falling material, transforming its free fall collision into a multi-angle shearing impact. S3.4 Dynamic sieving and media aggregation: The separator (54) uses the density and inertia difference between the agate balls and the powder to "sieve" and aggregate the agate balls in real time, so that they form an orderly rolling layer along the rod body, while the powder flows down from the gaps, achieving preliminary separation and particle size classification; Under the subsequent disturbance of the push plate (36), the aggregated agate balls can concentrate and orderly roll, compact and shear the powder layer below; S4. Post-processing and particle size classification: The powder shaped by ball milling enters a high-speed mixer for final homogenization, and then is precisely screened through fluidized bed airflow classification to select finished powders suitable for specific application requirements.

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