Centrifugal coating machine

Abstract

The utility model particularly relates to a centrifugal coating machine. The centrifugal coating machine comprises a rack, a coating pan, an air knife assembly, a coating pan outer cover, a rotary driving mechanism and a PLC (Programmable Logic Controller) control module, the rotary driving mechanism drives the coating pan to rotate around the center of the coating pan, centrifugal force is formed on materials in the coating pan, air blown by the air knife forms airflow opposite to the centrifugal force through the guide inclined plate, the airflow enters the coating pan and acts on the materials, the two forces are opposite, the speed of the airflow flowing through the surfaces of the materials is increased, and the bonded materials can be scattered. The materials are not easy to adhere in the coating process, the finished material particles are uniform, and the yield is high.

Description

Technical Field

[0001] This utility model relates to the field of coating machine technology, specifically to a centrifugal coating machine. Background Technology

[0002] Perforated coating machines are widely used in the pharmaceutical and food industries. They are mechatronic devices capable of coating tablets, pills, candies, etc., with organic films, water-soluble films, sustained-release and controlled-release coatings, drop pellets, sugar coatings, and coatings for chocolate and candy.

[0003] Currently, the coating process for pharmaceutical solid dosage forms is crude, energy-intensive, has a low degree of automation, and is difficult to control in terms of product quality consistency. During the coating process, materials tend to stick together and are not easy to disperse, resulting in inconsistent particle sizes in the finished product, which affects the quality of the finished product. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a centrifugal coating machine.

[0005] The technical solution adopted by this utility model is as follows: A centrifugal coating machine includes a frame, a coating pan, an air knife assembly, a coating pan cover, a rotary drive mechanism, and a PLC control module. The coating pan cover and the rotary drive mechanism are fixed on the frame. The coating pan is fitted inside the coating pan cover and has an axially arranged rotating shaft connected to its center. The drive end of the rotary drive mechanism is connected to the rotating shaft to drive the coating pan to rotate around the rotating shaft in a first direction A. The coating pan cover is provided with a coating spray gun that extends into the coating pan for liquid spraying coating.

[0006] The coating pan is cylindrical, and a first air inlet pipe is connected to its outer peripheral wall and arranged radially therein. The interface between the outer peripheral wall of the coating pan and the first air inlet pipe has several evenly distributed vent holes at a position away from the first direction A.

[0007] The first intake pipe has an intake end and an outlet end along its axial direction, and a guide ramp is provided inside the first intake pipe.

[0008] The air knife assembly includes an air knife. The air blown from the air knife enters the first air inlet pipe, is guided by a guide plate to form an airflow opposite to the first direction A, and then enters the coating pan through the vent.

[0009] Preferably, both ends of the guide plate in the axial direction of the coating pan are connected to the inner wall of the first air inlet pipe.

[0010] Preferably, stirring blades are also fixed on the inner walls of both sides of the coating pan.

[0011] Preferably, the coating pan cover is fixed to the frame and has a first inlet and a first outlet. The outer peripheral wall of the coating pan is provided with inlet and outlet ports, and inlet and outlet ports are provided with inlet and outlet gates. The inlet and outlet gates are controlled to open and close by a PLC control module.

[0012] The rotary drive mechanism is connected to the PLC control module and drives the coating pan to rotate under the command of the PLC control module. It has a feeding position with the inlet and outlet opposite to the first inlet and a discharging position with the inlet and outlet opposite to the first outlet.

[0013] Preferably, the frame is further fixed with a vacuum feeder for feeding. The outlet end of the vacuum feeder and the first feed port include a first butterfly valve, a weighing component, and a second butterfly valve connected in sequence and all cooperating with the PLC control module. The PLC control module controls the flow between the outlet end of the vacuum feeder and the inlet end of the weighing component by controlling the opening and closing of the first butterfly valve, and receives information feedback from the weighing component to control the opening and closing of the second butterfly valve to control the flow between the outlet end of the weighing component and the first feed port.

[0014] Preferably, it also includes an air intake system, which includes a second air intake duct, an electric heating cabinet, and an air intake fan. The air intake fan is used to introduce external air into the electric heating cabinet for heating. The second air intake duct is connected to the air inlet end of the coating pan cover and the air outlet end of the electric heating cabinet. The air enters the coating pan through the vent to preheat the uncoated sheets before coating / to dry the coated products.

[0015] Preferably, the inlet end of the air intake fan is connected to a filter assembly, which includes a pre-filter, a middle filter, and a surface cooling dehumidification plate.

[0016] Preferably, the inlet end of the air intake fan is also equipped with a differential pressure detection device that measures the pressure of the air intake before and after the filter assembly and is connected to the PLC control module.

[0017] Preferably, the air knife assembly further includes a booster fan, through which the incoming air reaches the air knife.

[0018] The beneficial effects of this utility model are as follows: The rotary drive mechanism drives the coating pan to rotate around its center, forming centrifugal force on the material inside. The air blower blows air through the guide plate to form an airflow in the opposite direction to the centrifugal force and enters the coating pan to act on the material. The two forces are opposite to each other, which increases the rate at which the airflow passes over the surface of the material, can break up the sticky material, making the material less likely to stick together during the coating process, resulting in uniform particle size of the finished material and a high yield. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0020] Figure 1 This is a front view structural diagram of an embodiment of the present utility model;

[0021] Figure 2 This is a rear view structural diagram of an embodiment of the present utility model;

[0022] Figure 3 This is a front view of the coating pan in an embodiment of this utility model;

[0023] Figure 4 This is a side view of the coating pan in an embodiment of the present invention;

[0024] Figure 5 This is a front view of the outer cover of the coating pan in an embodiment of this utility model;

[0025] Figure 6 This is a side view of the outer cover of the coating pan in an embodiment of this utility model;

[0026] Figure 7 This is a front view of the air intake system in an embodiment of this utility model;

[0027] In the diagram, 1-frame, 2-coating pan, 3-coating pan cover, 21-coating spray gun, 22-first air inlet pipe, 23-vent hole, 24-inlet / outlet, 25-inlet / outlet gate, 26-stirring blade, 31-first inlet, 32-first outlet, 41-air knife, 42-booster fan, 51-vacuum feeder, 52-first butterfly valve, 53-weighing assembly, 54-second butterfly valve, 61-second air inlet pipe, 62-electric heating cabinet, 63-inlet fan, 71-primary filter, 72-secondary filter, 73-surface cooling dehumidification plate, 74-differential pressure detection element, 221-guide ramp. Detailed Implementation

[0028] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0029] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0030] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0031] like Figures 1 to 7 As shown in the illustration, a centrifugal coating machine according to an embodiment of this utility model includes a frame 1, a coating pan 2, an air knife assembly, a coating pan cover 3, a rotary drive mechanism, and a PLC control module. The coating pan cover 3 and the rotary drive mechanism are fixed to the frame 1. The coating pan 2 is fitted inside the coating pan cover 3, and an axially arranged rotating shaft is connected to its center. The drive end of the rotary drive mechanism is connected to the rotating shaft to drive the coating pan 2 to rotate around the rotating shaft in a first direction A. The coating pan cover 3 is provided with a coating spray gun 21 that extends into the coating pan 2 for liquid spraying coating.

[0032] The coating pan 2 is cylindrical, and a first air inlet pipe 22 is connected to its outer peripheral wall and arranged radially therein. The interface between the outer peripheral wall of the coating pan 2 and the first air inlet pipe 22 is provided with a plurality of evenly distributed vent holes 23 at a position away from the first direction A.

[0033] The first air intake pipe 22 has an air intake end and an air outlet end along its axial direction, and a guide ramp 221 is provided inside the first air intake pipe 22.

[0034] The air knife assembly includes an air knife 41. The air blown from the air knife 41 enters the first air inlet pipe 22, is guided by the guide plate 221 to form an airflow opposite to the first direction A, and then enters the coating pan 2 through the vent 23.

[0035] With this setup, the rotary drive mechanism drives the coating pan to rotate around its center, creating centrifugal force on the material inside. The air blower blows air through the guide plate, forming an airflow in the opposite direction to the centrifugal force, which enters the coating pan and acts on the material. The two forces are opposite to each other, increasing the rate at which the airflow passes over the material surface, breaking up any sticky materials, making it less likely for the materials to stick together during the coating process, resulting in uniform particle size in the finished product and a high yield.

[0036] In this embodiment, the rotary drive mechanism is specifically a rotary motor.

[0037] Both ends of the guide plate 221 in the axial direction of the coating pan 2 are connected to the inner wall of the first air inlet pipe 22.

[0038] This setting prevents the air from the air knife from passing through the two ends of the guide plate in the axial direction of the coating pan, thus improving the guiding efficiency of the guide plate.

[0039] The inner walls on both sides of the coating pan 2 are also fixed with stirring blades 26.

[0040] With this setup, the mixing blades can work in conjunction with the air knife airflow to disperse the material, further improving the uniformity of the finished product particles.

[0041] The coating pan cover 3 is fixed to the frame 1 and has a first inlet 31 and a first outlet 32. The outer peripheral wall of the coating pan 2 is provided with inlet and outlet ports 24, and inlet and outlet gates 25 are provided at the inlet and outlet ports 24. The inlet and outlet gates 25 are controlled to open and close by a PLC control module.

[0042] The rotary drive mechanism is connected to the PLC control module and drives the coating pan 2 to rotate under the command of the PLC control module. The coating pan 2 has a feeding position with the inlet / outlet 24 opposite to the first inlet 31 and a discharging position with the inlet / outlet 24 opposite to the first outlet.

[0043] The frame 1 is also fixed with a vacuum feeder 51 for feeding. The outlet end of the vacuum feeder 51 and the first feed port 31 include a first butterfly valve 52, a weighing component 53, and a second butterfly valve 54 connected in sequence and all cooperating with the PLC control module. The PLC control module controls the flow between the outlet end of the vacuum feeder 51 and the inlet end of the weighing component 53 by controlling the opening and closing of the first butterfly valve 52, and receives information feedback from the weighing component 53 to control the opening and closing of the second butterfly valve 54 to control the flow between the outlet end of the weighing component 53 and the first feed port 31.

[0044] It also includes an air intake system, which includes a second air intake duct 61, an electric heating cabinet 62, and an air intake fan 63. The air intake fan 63 is used to introduce external air into the electric heating cabinet 62 for heating. The second air intake duct 61 is connected to the air inlet end of the coating pan cover 3 and the air outlet end of the electric heating cabinet 62. The air enters the coating pan 2 through the vent 23 to preheat the uncoated sheets before coating / to dry the coated products.

[0045] The air source for the air knife can be set separately, or the air knife's air inlet pipe can be connected to the second air inlet pipe at a certain point and the flow can be controlled by the air inlet control valve.

[0046] The inlet end of the air intake fan 63 is connected to a filter assembly, which includes a primary filter 71, a secondary filter 72, and a surface cooling dehumidification plate 73.

[0047] With this setup, the incoming air passes through the primary filter, the secondary filter, and the surface dehumidifier before entering the electric heating cabinet, effectively removing dust and moisture from the incoming air.

[0048] The inlet end of the air intake fan 63 is also equipped with a differential pressure detection element 74 that measures the pressure of the air intake before and after the filter assembly and is connected to the PLC control module.

[0049] The air knife assembly also includes a booster fan 42, through which air enters and reaches the air knife 41.

[0050] This setting increases the airflow velocity, further improving the final material coating effect.

[0051] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, optical disk, etc.

[0052] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A centrifugal coating machine, comprising a frame (1), a coating pan (2), an air knife assembly, a coating pan cover (3), a rotary drive mechanism, and a PLC control module, wherein the coating pan cover (3) and the rotary drive mechanism are fixed on the frame (1), the coating pan (2) is fitted inside the coating pan cover (3) and a rotating shaft is axially connected to its center, the drive end of the rotary drive mechanism is connected to the rotating shaft to drive the coating pan (2) to rotate around the rotating shaft in a first direction (A), and the coating pan cover (3) is provided with a coating spray gun (21) extending into the coating pan (2) for liquid spraying coating, characterized in that: The coating pan (2) is cylindrical, and a first air inlet pipe (22) is connected to its outer peripheral wall and arranged radially therein. The interface between the outer peripheral wall of the coating pan (2) and the first air inlet pipe (22) is provided with a plurality of evenly distributed vent holes (23) at a position away from the first direction (A). The first air intake pipe (22) has an air intake end and an air outlet end along its axial direction, and a guide ramp (221) is provided inside the first air intake pipe (22). The air knife assembly includes an air knife (41). The air blown from the air knife (41) enters the first air inlet pipe (22), is guided by the guide plate (221) to form an airflow opposite to the first direction (A), and then enters the coating pan (2) through the vent (23).

2. The centrifugal coating machine according to claim 1, characterized in that: The guide plate (221) is connected to the inner wall of the first air inlet pipe (22) at both ends in the axial direction of the coating pan (2).

3. A centrifugal coating machine according to claim 1, characterized in that: The inner walls on both sides of the coating pan (2) are also fixed with stirring blades (26).

4. A centrifugal coating machine according to claim 1, characterized in that: The coating pan cover (3) is fixed to the frame (1) and has a first inlet (31) and a first outlet (32). The coating pan (2) has an inlet / outlet (24) on its outer peripheral wall. The inlet / outlet (24) is provided with an inlet / outlet gate (25). The inlet / outlet gate (25) is controlled to open and close by a PLC control module. The rotary drive mechanism is connected to the PLC control module and drives the coating pan (2) to rotate under the instruction of the PLC control module. The feed position is opposite to the first feed port (31) and the discharge position is opposite to the first discharge port.

5. A centrifugal coating machine according to claim 4, characterized in that: The frame (1) is also fixed with a vacuum feeder (51) for feeding. The outlet end of the vacuum feeder (51) and the first feed port (31) include a first butterfly valve (52), a weighing component (53), and a second butterfly valve (54) connected in sequence and all cooperating with the PLC control module. The PLC control module controls the flow between the outlet end of the vacuum feeder (51) and the inlet end of the weighing component (53) by controlling the opening and closing of the first butterfly valve (52), and receives information feedback from the weighing component (53) to control the opening and closing of the second butterfly valve (54) to control the flow between the outlet end of the weighing component (53) and the first feed port (31).

6. A centrifugal coating machine according to claim 1, characterized in that: It also includes an air intake system, which includes a second air intake duct (61), an electric heating cabinet (62), and an air intake fan (63). The air intake fan (63) is used to introduce external air into the electric heating cabinet (62) for heating. The second air intake duct (61) is connected to the air intake end of the coating pan cover (3) and the air outlet end of the electric heating cabinet (62). The air enters the coating pan (2) through the vent (23) to preheat the uncoated sheets before coating / to dry the coated products.

7. A centrifugal coating machine according to claim 6, characterized in that: The inlet end of the air intake fan (63) is connected to a filter assembly, which includes a primary filter (71), a secondary filter (72), and a surface cooling dehumidification plate (73).

8. A centrifugal coating machine according to claim 7, characterized in that: The inlet end of the air intake fan (63) is also equipped with a differential pressure detection device (74) that measures the pressure of the air intake before and after the filter assembly and is connected to the PLC control module.

9. A centrifugal coating machine according to any one of claims 1-8, characterized in that: The air knife assembly also includes a booster fan (42), and the air enters through the booster fan (42) and then reaches the air knife (41).

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