Solid-liquid two-phase centrifugal coating machine

Abstract

The utility model relates to the technical field of powder coating equipment, in particular to a solid-liquid two-phase centrifugal coating machine which comprises a fixed cylinder and a rotating cylinder which are coaxially arranged, the rotating cylinder rotates to drive materials in the rotating cylinder to rotate and exert centrifugal force, and the materials in the rotating cylinder are separated from the fixed cylinder. The materials are extruded by the fixed cylinder and the rotating cylinder and extruded by the rotating cylinder and an arc cutter arranged in the rotating cylinder, so that the materials are coated while being fused. The powder feeding port and the liquid feeding port are arranged at the same time, so that solid-phase coating of powder to powder and liquid-phase coating of liquid to powder can be achieved, especially liquid can be continuously or discontinuously added in the coating process during liquid-phase coating, powder agglomeration is prevented, coating quality is improved, operation is simple, and production efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of powder coating equipment technology, and in particular to a solid-liquid two-phase centrifugal coating machine. Background Technology

[0002] Powder materials, especially ultrafine powders, possess superior optical, thermal, electrical, magnetic, and catalytic properties compared to bulk and large particles, and have been widely used in industry. However, due to their high specific surface area and compositional limitations, powder materials suffer from drawbacks such as easy agglomeration and short lifespan, which restricts their application development. To overcome these shortcomings, powder modification can significantly improve material properties, and since most chemical reactions occur at surface interfaces, surface modification is the most direct modification method.

[0003] The basic mechanism of powder modification and coating relies on the physical and chemical bonding between the modifier and the powder. Physical bonding is simple, applicable, and widely used in industrial applications. Physical modification utilizes mechanical force to achieve the bonding between the powder and the modifier; it has a short processing time, the reaction is easy to control, and it allows for continuous mass production. For example, patent CN109499425B – a coating machine – uses a rotating agitator to promote powder coating; patent CN112090355B – a gas phase coating reactor – uses a rotating cylinder to promote gas and solid coating. However, these methods are more difficult to use for coating liquids and powders, as it is challenging to automatically and continuously add liquids during the coating process. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a solid-liquid two-phase centrifugal coating machine. This machine utilizes the interaction between a centrifugal rotating cylinder and a coating blade to achieve efficient and high-quality material fusion and coating. It is equipped with both a solid powder inlet and a liquid inlet to meet different coating requirements, and the liquid injection can be automatically controlled during the coating process.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a solid-liquid two-phase centrifugal coating machine, comprising:

[0006] The fixed cylinder has a temperature control jacket on its inner wall, a powder feeding port and a liquid feeding port at the top, and a discharge port at the bottom.

[0007] A rotary cylinder is coaxially nested inside the fixed cylinder and is driven to rotate by a drive device. Its side walls are distributed with circulation slots that allow the material inside to pass through and reach the fixed cylinder. The rotary cylinder is provided with an upper scraper and a lower scraper on its outer circumferential surface facing the fixed cylinder, and an arc-shaped bottom scraper on its bottom surface.

[0008] A cylinder cover is provided on the top of the fixed cylinder. The powder feeding port and the liquid feeding port are provided on the cylinder cover. The cylinder cover is also provided with an arc blade and a straight shovel blade hanging inside the rotating cylinder.

[0009] A temperature control system, connected to the temperature control jacket of the fixed cylinder, is used to adjust the coating reaction temperature.

[0010] Preferably, the fixed cylinder is composed of an inner cylinder and an outer cylinder that are coaxially fitted together and fused together at the top. The temperature control jacket of the fixed cylinder is a cooling water jacket disposed in the gap between the inner cylinder and the outer cylinder. The cooling water jacket is provided with a guide plate that spirals upward around the inner cylinder. The cooling water jacket is provided with an inlet and an outlet that are connected to the temperature control system. The inlet is located below the bottom end of the guide plate, and the outlet is located above the top end of the guide plate.

[0011] Preferably, the powder feeding port is equipped with a pneumatic gate, and the liquid feeding port is equipped with an atomizing nozzle, the atomizing nozzle being adjustable within a range of 30°-90° relative to the horizontal plane.

[0012] Preferably, the outer end of the discharge port is connected to a discharge cylinder, the other end of the discharge cylinder is provided with a cylinder, a sealing piston driven by the cylinder is provided inside the discharge cylinder, and a feeding pipe is provided in the middle section of the discharge cylinder.

[0013] Preferably, the bottom of the fixed cylinder is rotatably connected to a drive shaft via a bearing, the bottom end of the drive shaft is connected to a drive device, and the top end of the drive shaft is fixedly connected to the rotating cylinder.

[0014] Preferably, the number of lower blades is greater than the number of upper blades, and they are all evenly distributed around the rotating cylinder, with the lower blades located near the bottom of the rotating cylinder.

[0015] Preferably, the arc-shaped bottom scraper is installed in an involute shape along the center to the edge of the rotating cylinder, and there are at least six arc-shaped bottom scrapers, which are evenly distributed circumferentially around the axis of the rotating cylinder.

[0016] Preferably, the gap between the lower scraper, the upper scraper and the inner wall of the fixed cylinder is ≥3mm, and the distance between the bottom surface of the arc-shaped bottom scraper and the bottom surface of the fixed cylinder is ≥3mm.

[0017] Preferably, the convex arc surface of the circular arc blade faces the inner wall of the rotating cylinder, the top view of the straight blade is a right trapezoid, and the minimum gap between the straight blade and the inner wall of the rotating cylinder is smaller than the gap between the arc top of the circular arc blade and the inner wall of the rotating cylinder.

[0018] Preferably, the cylinder head is fixed with four vertical cutter bars, which are evenly distributed around the center of the cylinder head. The bottom sides of two opposing cutter bars are fixed with arc-shaped cutters by screws, and the bottom sides of the other two opposing cutter bars are fixed with straight scrapers by screws. A shim is provided at the mounting point to adjust the gap between the arc-shaped cutter, the straight scraper and the inner wall of the rotating cylinder.

[0019] Preferably, the gap between the arc-shaped top of the circular blade and the inner wall of the rotating cylinder is 3-5mm, and the minimum gap between the straight blade and the inner wall of the rotating cylinder is 2.5-5mm.

[0020] The beneficial effects of this utility model are as follows: A solid-liquid two-phase centrifugal coating machine includes a fixed cylinder and a rotating cylinder arranged coaxially. The rotating cylinder rotates to drive the material inside to rotate and applies centrifugal force, so that the material is subjected to mechanical forces such as the fixed cylinder, the rotating cylinder, and the arc blades set inside the rotating cylinder, thereby achieving material fusion and coating simultaneously. This utility model is also provided with a powder feeding port and a liquid feeding port, thereby realizing solid-phase coating of powder to powder and liquid-phase coating of powder to powder. In particular, liquid-phase coating allows for continuous or intermittent addition of liquid during the coating process, thereby preventing powder agglomeration, improving coating quality, and is simple to operate and has high production efficiency. Attached Figure Description

[0021] Figure 1 This is a front view of a solid-liquid two-phase centrifugal coating machine according to this utility model;

[0022] Figure 2 This is a schematic diagram of the planar structure of the cylinder block.

[0023] Figure 3 yes Figure 2 AA section view;

[0024] Figure 4 yes Figure 2 BB cross-sectional view;

[0025] Figure 5 This is a three-dimensional structural diagram of the rotary cylinder.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1 – Fixed cylinder, 2 – Rotary cylinder, 21 – Circulation trough, 22 – Upper scraper, 23 – Lower scraper, 24 – Arc-shaped bottom scraper, 3 – Cylinder cover, 31 – Powder feed port, 32 – Liquid feed port, 33 – Arc blade, 34 – Straight scraper, 35 – Blade holder, 4 – Discharge port, 41 – Discharge cylinder, 42 – Cylinder, 43 – Sealing piston, 44 – Discharge pipe, 5 – Drive unit, 6 – Cooling water jacket, 61 – Guide plate, 62 – Water inlet, 63 – Water outlet. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the present invention.

[0029] like Figure 1-5 As shown, a solid-liquid two-phase centrifugal coating machine of this embodiment includes a fixed cylinder 1 and a rotating cylinder 2 arranged coaxially. The rotating cylinder 2 is located inside the fixed cylinder 1. A drive shaft is rotatably connected to the bottom center of the fixed cylinder 1 through a bearing. The upper end of the drive shaft is fixedly connected to the rotating cylinder 2, and the lower end of the drive shaft is connected to a drive device 5 through a chain, belt or synchronous belt. The drive device 5 is a motor.

[0030] The sidewall of the rotating cylinder 2 is provided with circulation slots 21 that allow the material inside to pass through and reach the fixed cylinder, thereby facilitating the circulation of material between the fixed cylinder and the rotating cylinder during fusion and coating, and facilitating the passage of material during unloading. The outer wall of the rotating cylinder 2 is circumferentially provided with a lower scraper 23 near the bottom and an upper scraper 22 above the lower scraper 23. The gap between the upper scraper 22, the lower scraper 23 and the inner wall of the fixed cylinder 1 is 5mm. The bottom surface of the outer wall of the rotating cylinder 2 is provided with an arc-shaped bottom scraper 24, and the gap between the arc-shaped bottom scraper 24 and the inner wall of the fixed cylinder 1 is 3mm.

[0031] The top of the fixed cylinder 1 is provided with an openable and closable cylinder cover 3. When the cylinder cover 3 is closed, the interior of the fixed cylinder 1 can be completely sealed to prevent powder from escaping or being oxidized. The cylinder cover 3 is provided with a powder feeding port 31 and a liquid feeding port 32 for feeding materials into the rotating cylinder 2. The powder feeding port 31 is provided with a gate controlled by a cylinder to open and close, and the liquid feeding port 32 is provided with an atomizing nozzle. The atomizing nozzle is connected to the liquid container through a high-pressure pipe, and the atomizing nozzle can be adjusted within the range of 30°-90° with respect to the horizontal plane.

[0032] In addition, in order to balance the internal and external pressures of the fixed cylinder 1 to facilitate feeding and unloading, a filter screen and a pneumatic turbine vibrator are provided on the top of the cylinder cover 3.

[0033] The cylinder head 3 is fixed with four cutter rods 35 around its center circumference. The cutter rods 35 are vertical and extend downward into the interior of the rotating cylinder 2. The bottom sides of two opposing cutter rods 35 are fixed with arc-shaped cutters 33 by screws, and the bottom sides of the other two opposing cutter rods 35 are fixed with straight scraper cutters 34 by screws. In order to adjust the gap between the arc-shaped cutters 33, the straight scraper cutters 34 and the inner wall of the rotating cylinder 2, shims are provided at the locations where the arc-shaped cutters 33 and the straight scraper cutters 34 are installed on the cutter rods 35.

[0034] To improve the efficiency and quality of solid and liquid phase coating of powder, the fixed cylinder 1 is composed of two coaxially fitted inner cylinders and outer cylinders. The top gap between the inner and outer cylinders is sealed, thereby forming a cavity structure cooling water jacket 6 between the inner and outer cylinders. The bottom end of the cooling water jacket 6 is provided with a water inlet 62 and the top end is provided with a water outlet 63. A guide plate 61 is provided between the water inlet 62 and the water outlet 63 of the cooling water jacket 6. The guide plate 61 spirals upward around the inner cylinder to form a spiral water channel.

[0035] When performing liquid phase coating operations, one or more powders are first added through the powder feeding port 31, and then the drive device 5 is started to make the rotating cylinder 2 rotate at high speed inside the fixed cylinder 1. At the same time, atomized liquid is continuously or intermittently sprayed into the rotating cylinder 2 through the liquid feeding port 32.

[0036] The rotation of the rotating cylinder 2 causes the powder to rotate as well. During rotation, the powder is obstructed by the blade 35 and fused together during its circulation between the rotating cylinder 2 and the fixed cylinder 1. Furthermore, the powder is subjected to centrifugal force during rotation and is compressed as it passes through the gap between the arc-shaped blade 33 and the inner wall of the rotating cylinder 2, causing it to accumulate on the inner walls of both the rotating cylinder 2 and the fixed cylinder 1. It is then scraped off by the upper scraper 22, the lower scraper 23, the arc-shaped bottom scraper 24, and the straight scraper 34. This process is repeated, further fusing the powder and liquid and coating the powder surface with liquid. To reduce powder adhesion to the cylinder walls, the inner walls of both the fixed cylinder 1 and the rotating cylinder 2 are polished.

[0037] After running for a certain period of time, such as 10 minutes, the added powder is fully mixed and coated by the liquid, and then the discharge port 4 is opened for unloading. In order to fully unload the material, the outer end of the discharge port 4 is connected to the discharge cylinder 41, and the other end of the discharge cylinder 41 is provided with a cylinder 42. The discharge cylinder 41 is provided with a sealing piston 43 that is driven to slide by the cylinder 42, and the middle section of the discharge cylinder 41 is provided with a feeding pipe 44.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and for the convenience of describing the technical solution, the front, back, left, right, top, middle, and bottom orientations are based on the accompanying drawings and are not a limitation on the protection scope of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the essence and scope of the technical solution of this utility model.

Claims

1. A solid-liquid dual phase centrifugal enrober, characterized by: The application relates to a powder coating device. The fixed cylinder is provided with a temperature control interlayer on the inner wall, a powder feeding port and a liquid feeding port on the top, and a discharging port on the bottom. The rotating cylinder is coaxially nested in the fixed cylinder and is driven to rotate by a driving device, and the side wall is provided with circulating notches for allowing the internal materials to pass through and reach the fixed cylinder. The cylinder cover is arranged on the top of the fixed cylinder, and the powder feeding port and the liquid feeding port are arranged on the cylinder cover. The temperature control system is connected with the temperature control interlayer of the fixed cylinder and is used for adjusting the coating reaction temperature.

2. A solid-liquid dual-phase centrifugal enrober according to claim 1, characterised in that: The fixed cylinder is composed of an inner cylinder and an outer cylinder which are coaxially nested and fused at the top.

3. A solid-liquid dual-phase centrifugal enrober according to claim 1, characterised in that: The powder feeding port is provided with a pneumatic gate, and the liquid feeding port is provided with an atomizing nozzle.

4. A solid-liquid dual-phase centrifugal enrober according to claim 1, characterized in that: The outer end of the discharging port is connected with a discharging barrel, the other end of the discharging barrel is provided with a pneumatic cylinder, the discharging barrel is provided with a sealing piston which is driven to slide by the pneumatic cylinder, and the middle section of the discharging barrel is provided with a discharging pipe.

5. A solid-liquid dual phase centrifugal enrober according to claim 1, characterized in that: The gap between the lower cutter, the upper cutter and the inner wall of the fixed cylinder is greater than or equal to 3 mm.

6. A solid-liquid dual-phase centrifugal enrober according to claim 1, characterized in that: The arc surface of the outward convex arc cutter faces the inner wall of the rotating cylinder.

7. A solid-liquid dual phase centrifugal enrober according to claim 1, characterized in that: The four vertical cutter rods are circumferentially distributed around the center of the cylinder cover.

8. A solid-liquid dual-phase centrifugal enrober according to claim 1, characterized in that: The gap between the arc top of the arc cutter and the inner wall of the rotating cylinder is 3-5 mm. The minimum gap between the straight cutter and the inner wall of the rotating cylinder is 2.5-5 mm.

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