A low-density powder liquid phase coating device and its use method

Abstract

The present invention discloses a low-density powder liquid phase coating device and a method of using the same, which relates to the technical field of powder surface modification equipment, including a raw material conveying plate, the raw material conveying plate is placed in a feeding area, the raw material conveying plate includes a tray for holding powder; a fixture, the fixture includes a tray support frame and a screw transmission; the tray is placed on the tray support frame, and the tray is lifted by the screw transmission; a coating liquid recovery system, the coating liquid recovery system connects the raw material conveying plate and the coating pool; a coating pool, the coating pool is placed on the top of the feeding area, the coating pool includes a coating pool shell, and the coating pool shell is provided with a heating system, an exhaust system, a movable screen and an ultrasonic oscillator; a conveyor belt, which is used to take the powder out of the coating pool. The present invention provides a novel low-density powder liquid phase coating device, which is suitable for the automated continuous production of low-density powder surface modification processing.

Description

Technical Field

[0001] The present invention relates to the technical field of powder surface modification equipment, and in particular to a low-density powder liquid phase coating device and a use method thereof. Background Art

[0002] Powder materials are everywhere in life and their application fields are very wide. In order to improve the performance of powder materials and broaden their application value, special performance modifications are often made to powder materials. Due to their high specific gravity, powder materials with higher density can sink to the bottom or suspend in water phases and organic solvents, and can be dispersed and modified by coating by soaking, stirring, etc. However, low-density powders cannot be well dispersed because they easily float on the surface of the liquid phase, and it is difficult to achieve liquid phase coating. The powder coating methods disclosed in patents CN219621252U and CN219526771 U both use chemical vapor deposition, but the powder has the property of accumulation, so it is impossible to achieve complete coating on the powder surface. Realizing full surface coating of powder is an urgent problem that researchers in this field need to solve. Summary of the invention

[0003] The present invention aims at the problems and shortcomings of the existing low-density powder that cannot be effectively modified by coating and there is no liquid phase coating equipment, and provides a low-density powder liquid phase coating device.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A low-density powder liquid phase coating device comprises a raw material conveying plate, the raw material conveying plate is placed in a feeding area, and the raw material conveying plate comprises a tray for containing powder;

[0006] A fixer, the fixer comprising a tray support frame and a screw drive; the tray is placed on the tray support frame, and the tray is lifted by the screw drive;

[0007] A coating liquid recovery system, wherein the coating liquid recovery system is connected to the raw material delivery tray and the coating tank;

[0008] A coating pool, the coating pool is placed on the top of the feeding area, the coating pool includes a coating pool shell, and the coating pool shell is provided with a heating system, an exhaust system, a movable screen and an ultrasonic oscillator;

[0009] Conveyor belt, used to take the powder out of the coating tank;

[0010] A blast dryer, wherein the blast dryer is located on the top of the conveyor belt, and the direction of the blast outlet, the top of the conveyor belt, and the center of the heating furnace are in a straight line;

[0011] The heating furnace, located on one side of the conveyor belt, is used to heat treat the powder.

[0012] As a further solution of the present invention: the top of the tray is provided with a sealing rubber ring for sealing, the bottom of the tray contains a liquid level sensor, and the bottom of the side of the tray is provided with a quick-connect pipe connected to the coating liquid recovery system.

[0013] As a further solution of the present invention: the quick-connect pipeline includes a quick connector, which is a hard tube embedded in the side wall of the tray, and a soft and retractable soft tube is contained between the hard tube and the connector; the edge of the connector contains a retractable driving part for driving the quick connector and the recovery pipe connector to automatically connect.

[0014] As a further solution of the present invention: an openable feed port is provided on one side of the feed zone, a barrier is provided on the bottom of one side of the feed port, and a waste liquid drainage hole is provided on the bottom of the feed zone.

[0015] As a further solution of the present invention: the bottom exhaust hole of the exhaust system is located at the bottom of the coating pool shell, and the upper outlet of the exhaust pipe is located at the top of the coating pool shell.

[0016] As a further solution of the present invention: reciprocating telescopic devices are installed on both sides of the movable screen to drive the movable screen to reciprocate; the mesh size of the movable screen can be selected and replaced according to the particle size of the powder.

[0017] As a further solution of the present invention: the ultrasonic oscillator is located on the inner wall of the coating pool shell, and three groups are arranged in sequence from top to bottom, and each group has an independent ultrasonic intensity adjustment controller.

[0018] As a further solution of the present invention: the conveyor belt includes a rotating shaft and a crawler belt, the apex of the conveyor belt is located directly above the heating furnace, and the surface of the crawler belt has tooth-like protrusions.

[0019] As a further solution of the present invention: the heating furnace comprises a heating nozzle, a dispersion screen and a bottom heating plate, the heating nozzles are evenly distributed on both sides of the heating furnace wall, and are heated by gas flame spraying;

[0020] The two sides of the dispersion screen are provided with reciprocating telescopes to drive the dispersion screen to reciprocate or vibrate; the edge of the dispersion screen is provided with a limiter, and the heating furnace wall has a protruding structure at the bottom of the dispersion screen; the protruding structure contains rollers for the reciprocating motion of the dispersion screen;

[0021] The bottom heating plates are evenly distributed on both sides of the heating furnace wall and are located below the dispersion screen.

[0022] As a further solution of the present invention: a method for using a low-density powder liquid phase coating device comprises the following steps:

[0023] S1. Preparation of coating system: install 100-5000 mesh screen at the movable screen position, close the bottom switch valve, and inject the coating liquid into the coating tank; the height of the coating liquid is lower than the liquid level detector, turn on the heating system, and control the temperature at 25-40℃;

[0024] S2. Raw material transportation: Place the hollow glass microbeads soaked with silane coupling agent in the raw material delivery tray; open the feed port, place the raw material delivery tray on the tray support frame, fix the raw material delivery tray and the coating tank tightly through the screw drive, and fix the quick-release pipe at the bottom of the tray side; close the feed port;

[0025] S3, coating process: turn on the ultrasonic oscillator and the movable screen; during the coating process, the ultrasonic oscillator is kept open and the movable screen keeps reciprocating oscillation; the bottom switch valve is opened, the coating liquid flows into the raw material conveying tray, and the gas or raised dust in the space is discharged through the exhaust system; under the action of buoyancy, the hollow glass microbeads float up and enter the coating pool through the movable screen;

[0026] S4, wet powder transmission: open the conveyor belt, the bottom of the conveyor belt is below the liquid surface; turn on the blast dryer; the hollow glass beads on the surface of the coating liquid are transported to the top of the heating furnace along the crawler belt; under the action of their own gravity and the wind force of the blast dryer, they fall into the heating furnace;

[0027] S5. Heat treatment of coated powder: turn on the heating nozzle in the heating furnace, maintain the temperature in the cavity at 80-100℃, remove excess water and ethanol on the surface of the powder, and solidify the film layer on the surface of the powder; keep the reciprocating oscillation of the dispersion screen open to prevent the agglomeration of the powder during the heat treatment; the coated hollow glass microbeads that fall into the heating plate are further heat treated, and the temperature is maintained at 110-120℃; the finished product is transported by the finished product conveyor belt.

[0028] The beneficial effects of the present invention are as follows: a novel low-density powder liquid phase coating device is provided, which is suitable for the automated continuous production of low-density powder surface modification processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Figure 1 It is a structural schematic diagram of a low-density powder liquid phase coating device of the present invention;

[0031] Figure 2 It is a schematic structural diagram of a dispersion screen of a low-density powder liquid phase coating device of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-2 As shown, the present invention is a low-density powder liquid phase coating device, a. Raw material conveying tray 1, the raw material conveying tray 1 includes a rectangular or cube tray 11 for holding powder, a sealing rubber ring 12 is provided on the top of the tray for sealing; a liquid level sensor 13 is provided at the bottom of the tray; a quick-connect pipe 14 is provided at the bottom of the tray side. The raw material conveying tray is placed in a feeding area 15. An openable feeding port 16 is provided on one side of the feeding area. A blocking baffle 17 is provided at the bottom of one side of the feeding port to prevent liquid from leaking out. A waste liquid drainage hole 18 is provided at the bottom of the feeding area to facilitate waste liquid recovery.

[0034] b. Fixer 2, the fixer comprises a tray support frame 21 and a screw driver 22. The tray 11 is placed on the tray support frame 21, and the tray 11 is lifted up by the screw driver 22 and combined with the top support.

[0035] c. A coating liquid recovery system 3 , which includes a recovery pipe 31 and a liquid pump 32 .

[0036] d. A coating pool 4 , which includes a coating pool housing 41 , a heating system 42 , a liquid level detector 43 , an exhaust system 44 , a bottom switch valve 45 , a movable screen 46 , and an ultrasonic oscillator 47 .

[0037] e. Conveyor belt 5, said conveyor belt 5 comprises a rotating shaft 51 and a crawler belt 52. The top of the conveyor belt 52 is located directly above the heating furnace 7. The crawler belt 52 has tooth-like protrusions on its surface, which are used to take the powder out of the coating pool.

[0038] f. Blast dryer 6, the blast dryer 6 is located on the top of the conveyor belt 52, and the direction of the blast port, the top of the conveyor belt and the center of the heating furnace are in a straight line.

[0039] g. A heating furnace 7 , which includes a heating nozzle 71 , a dispersion screen 72 , and a bottom heating plate 73 .

[0040] f. Finished material transmission belt 8, wherein the finished material transmission belt 8 comprises a rotating shaft 81 and a crawler belt 82.

[0041] The quick-connect pipe 14 includes a quick connector, which is a hard tube made of metal, polytetrafluoroethylene, plastic, etc. embedded in the side wall of the tray, and a soft and retractable soft tube is contained between the hard tube and the connector. The side of the connector contains a retractable driving member, which can be a spring, for driving the quick connector to automatically connect with the recovery pipe connector.

[0042] The heating system 42 includes an electric heating wire, a temperature sensor, and a temperature controller. The electric heating wire is used for heating, the temperature sensor is used for measuring the temperature, and the temperature controller is used for adjusting the temperature.

[0043] The bottom exhaust hole of the exhaust system 44 is located at the bottom of the coating pool shell, and the upper outlet of the exhaust pipe is located at the top of the coating pool shell.

[0044] The movable screen 46 has reciprocating retractors installed on both sides of the screen to drive the screen to reciprocate. The mesh size of the movable screen can be selected and replaced according to the particle size of the powder.

[0045] The ultrasonic oscillator 47 includes three groups, upper and lower, each group having an independent ultrasonic intensity adjustment controller.

[0046] The heating nozzles 71 are evenly distributed on both sides of the heating furnace wall and are heated by gas spraying. The heating furnace wall can also be heated by a resistance wire heating device. The heating nozzles or resistance wire heating devices are individually controlled on the upper and lower parts of the dispersion screen.

[0047] The dispersion screen 72, such as Figure 2 As described, there are reciprocating retractors 721 on both sides to drive the screen to reciprocate or vibrate to reduce the agglomeration of powder due to heating. A limiter is installed on the edge of the dispersion screen 72. The heating furnace wall has a protruding structure 722 at the bottom of the dispersion screen 72. The protruding structure contains a roller 723 for the reciprocating motion of the dispersion screen.

[0048] The bottom heating plate 73 includes a temperature controller and a temperature detector. The temperature is adjusted by the temperature controller and the temperature is detected by the temperature detector.

[0049] In this embodiment, hollow glass microspheres with a particle size distribution of 45-50 μm and a true density of 0.3-0.34 g / cm3 are used for hydrophobic modification, which includes the following steps:

[0050] s1. Preparation of coating system: Install a 300 mesh screen at the position of the movable screen 46, and close the bottom switch valve 45. Inject the coating solution into the coating pool 4. The coating solution uses an ethanol aqueous solution of a low surface energy substance, and the low surface energy substance is one or a combination of trichlorosilane, trimethoxysilane, triethoxysilane, tridecafluorooctyl triethoxysilane, and heptadecafluorodecyl triethoxysilane, with a concentration of 2%-5%. The volume ratio of water to ethanol is 1:1-1:5. The height of the coating solution is lower than the liquid level detector 43. Turn on the heating system 42, and the temperature is controlled at 25-40°C.

[0051] S2. Raw material transportation: Place the hollow glass microbeads soaked with silane coupling agent in the raw material delivery tray 1. Open the feed port 16, place the raw material delivery tray 1 on the tray support frame 21, and fix the raw material delivery tray 1 and the coating tank 4 tightly through the screw driver 22, and fix the quick-release pipe 14 at the bottom of the tray side. Close the feed port 16.

[0052] S3. Coating process: turn on the ultrasonic oscillator 47 and the movable screen 46. During the coating process, the ultrasonic oscillator 47 is kept open, and the movable screen 46 keeps reciprocating oscillation. The bottom switch valve 45 is opened, and the coating liquid flows into the raw material conveying plate 1, and the gas or raised dust in the space is discharged through the exhaust system 44. Under the action of buoyancy, the hollow glass microbeads float up and enter the coating pool 4 through the movable screen 46. The power of the ultrasonic oscillator 47 is adjusted in real time according to the dispersion state of the hollow glass microbeads.

[0053] S4. Transfer of wet powder: Turn on the conveyor belt 5, the bottom of which is below the liquid surface. Turn on the blast dryer 6. The hollow glass microbeads on the surface of the coating liquid are transported to the top of the heating furnace 7 along the crawler belt 52. Under the action of their own gravity and the wind force of the blast dryer, they fall into the heating furnace 7.

[0054] S5. Heat treatment of coated powder: Turn on the heating nozzle 71 in the heating furnace 7, maintain the temperature in the cavity at 80-100°C, remove excess water and ethanol on the surface of the powder, and solidify the film layer on the surface of the powder. The reciprocating oscillation of the dispersion screen 72 is kept open to prevent the agglomeration of the powder during the heat treatment process. The coated hollow glass microspheres that fall into the heating plate 73 are further heat treated, and the temperature is maintained at 110-120°C. The finished product is transported by the finished product conveyor belt 8.

[0055] S6. Tail liquid treatment: After the hollow glass beads enter the coating pool 4, close the bottom switch valve 45. Start the liquid pump 32 to transport the coating liquid in the raw material delivery tray 1 back to the coating pool 4 for reuse. After the liquid level sensor 13 detects that there is no liquid, turn off the liquid pump 32, disconnect the quick-release pipe 14, return the tray support frame 21 to its original position, and lower the raw material delivery tray 1 at the same time. Open the feed port 16, take out the raw material delivery tray 1, and put in the next batch of raw materials. The liquid that seeps into the feeding area due to loose sealing or other reasons is discharged through the waste liquid drainage hole 18 at the bottom of the feeding area.

[0056] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A low-density powder liquid phase coating device, characterized in that: The invention comprises a raw material conveying tray (1), wherein the raw material conveying tray (1) is placed in a material feeding area (15), and the raw material conveying tray (1) comprises a tray (11) for containing powder; A fixer (2), the fixer (2) comprising a tray support frame (21) and a screw drive (22); the tray (11) is placed on the tray support frame (21), and the tray (11) is lifted up by the screw drive (22); A coating liquid recovery system (3), wherein the coating liquid recovery system is connected to the raw material transport tray (1) and the coating pool (4); A coating pool (4), the coating pool (4) being placed on the top of the feeding area (15), the coating pool (4) comprising a coating pool shell (41) and a bottom switch valve (45), the coating pool shell (41) being provided with a heating system (42), an exhaust system (44), a movable screen (46) and an ultrasonic oscillator (47); A conveyor belt (5) for taking the powder out of the coating tank (4); A blast dryer (6), the blast dryer (6) is located on the top of the conveyor belt (5), and the blast outlet direction, the top of the conveyor belt, and the center of the heating furnace are in a straight line; The heating furnace (7) is located on one side of the conveyor belt (5) and is used to perform heat treatment on the powder.

2. A low-density powder liquid phase coating device according to claim 1, characterized in that: The top of the tray (11) is provided with a sealing rubber ring (12) for sealing, the bottom of the tray (11) contains a liquid level sensor (13), and the bottom of the side of the tray (11) is provided with a quick-connect pipe (14) for connecting to a coating liquid recovery system (3).

3. A low-density powder liquid phase coating device according to claim 2, characterized in that: The pipeline (14) for quick connection includes a quick connector, which is a hard pipe embedded in the side wall of the tray (11) and is used to drive the quick connector to automatically connect with the recovery pipe connector.

4. A low-density powder liquid phase coating device according to claim 3, characterized in that: One side of the feeding area (15) is provided with an openable feeding port (16), the bottom of one side of the feeding port (16) is provided with a blocking baffle (17), and the bottom of the feeding area (15) is provided with a waste liquid drainage hole (18).

5. A low-density powder liquid phase coating device according to claim 4, characterized in that: The bottom exhaust hole of the exhaust system (44) is located at the bottom of the coating pool shell (41), and the upper outlet of the exhaust pipe is located at the top of the coating pool shell (41).

6. A low-density powder liquid phase coating device according to claim 5, characterized in that: Reciprocating telescopic devices are installed on both sides of the movable screen (46) to drive the movable screen (46) to reciprocate; the mesh size of the movable screen (46) can be selected and replaced according to the particle size of the powder.

7. A low-density powder liquid phase coating device according to claim 6, characterized in that: The ultrasonic oscillators (47) are located on the inner wall of the coating pool housing (41), and are arranged in three groups from top to bottom, each group having an independent ultrasonic intensity adjustment controller.

8. The low-density powder liquid phase coating device according to claim 7, characterized in that: The conveyor belt (5) comprises a rotating shaft (51) and a crawler belt (52). The top of the crawler belt (52) is located directly above the heating furnace (7), and the surface of the crawler belt (52) has tooth-like protrusions.

9. A low-density powder liquid phase coating device according to claim 8, characterized in that: The heating furnace (7) comprises a heating nozzle (71), a dispersion screen (72) and a bottom heating plate (73); the heating nozzle (71) is evenly distributed on both sides of the heating furnace wall and is heated by gas flame spraying; The two sides of the dispersion screen (72) are provided with reciprocating retractors (721) to drive the dispersion screen (72) to reciprocate or vibrate; the edge of the dispersion screen (72) is provided with a limiter, and the heating furnace wall has a protruding structure (722) at the bottom of the dispersion screen (72); the protruding structure (722) contains a roller (723) for the reciprocating motion of the dispersion screen (72); The bottom heating plates (73) are evenly distributed on both sides of the heating furnace wall and are located below the dispersion screen (72).

10. A method for using a low-density powder liquid phase coating device, characterized in that: The low-density powder liquid phase coating device according to claim 9 comprises the following steps: S1. Preparation of the coating system: Install a 100-5000 mesh screen at the position of the movable screen (46), close the bottom switch valve (45), and inject the coating liquid into the coating pool (4); when the height of the coating liquid is lower than the liquid level detector (43), turn on the heating system (42) and control the temperature at 25-40° C.; S2. Raw material transportation: hollow glass microbeads soaked in silane coupling agent are placed in a raw material transportation tray (1); the feed port (16) is opened, the raw material transportation tray (1) is placed on a tray support frame (21), the raw material transportation tray (1) is tightly fixed to the coating tank (4) by a screw drive (22), and the quick-connect pipe (14) at the bottom of the tray side is fixed; the feed port (16) is closed; S3, coating process: turn on the ultrasonic oscillator (47) and the movable screen (46); during the coating process, the ultrasonic oscillator (47) is kept open, and the movable screen (46) keeps reciprocating oscillation motion; open the bottom switch valve (45), the coating liquid flows into the raw material conveying plate (1), and the gas or raised dust in the space is discharged through the exhaust system (44); under the action of buoyancy, the hollow glass microbeads float up and enter the coating pool (4) through the movable screen (46); S4, wet powder transmission: open the conveyor belt (5), the bottom of the conveyor belt (5) is located below the liquid surface; open the air drier (6); the hollow glass microbeads on the surface of the coating liquid are conveyed to the top of the heating furnace (7) along the crawler belt (52); under the action of their own gravity and the wind force of the air drier, they fall into the heating furnace (7); S5, heat treatment of the coated powder: open the heating nozzle (71) in the heating furnace (7), maintain the temperature in the cavity at 80-100°C, remove excess water and ethanol on the surface of the powder, and solidify the film layer on the surface of the powder; keep the reciprocating oscillation of the dispersion screen (72) open to prevent the agglomeration of the powder during the heat treatment process; the coated hollow glass microspheres that fall into the heating plate (73) are further heat treated, and the temperature is maintained at 110-120°C; the finished product is transported by the finished product material transmission belt (8).

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