Electric heating structure of solid coating machine

Abstract

The utility model relates to an electric heating structure of a solid coating machine, which is mounted in an air inlet formed by an equal-diameter pipe and a reducer pipe, one side wall of the reducer pipe is provided with a mounting hole, the periphery of the mounting hole is provided with a limiting frame, and the limiting frame is detachably connected with a cover plate for sealing the mounting hole; an electric heating pipe is arranged on the cover plate, the electric heating pipe penetrates through the mounting hole and extends into the reducer pipe, an air uniformizing assembly is further arranged on the cover plate, the electric heating pipe is covered with the air uniformizing assembly, and a gap exists between the air uniformizing assembly and the electric heating pipe; hot air flows into the reducer pipe from the equal-diameter pipe, sequentially passes through the air uniformizing assembly and the electric heating pipe and then enters the coating machine. Temperature can be compensated in real time through the electric heating pipe, and it is ensured that hot air enters the coating machine at the set temperature.

Description

Technical Field

[0001] This utility model relates to the field of coating machine technology, and in particular to an electric heating structure for a solid coating machine. Background Technology

[0002] A coating machine is an electromechanical integrated device that can coat tablets, pills, candies, and other products with organic or water-soluble films. It is suitable for the pharmaceutical, chemical, and food industries. During operation, the accompanying heating device runs continuously, directly transferring heat through electric heating tubes, steam, or hot air, which accelerates the drying process and improves quality.

[0003] For example, CN207188052U discloses a high-efficiency coating machine in which the air inlet of the main body of the coating machine is connected to a high-efficiency filtered hot air fan via a pipe, and the air outlet of the main body of the coating machine is connected to a dust removal exhaust fan via a pipe. Another example is CN214511911U, which discloses a high-efficiency pharmaceutical coating device in which hot air is supplied to the coating machine from a filtered hot air cabinet via pipeline, while exhaust gas from the coating machine is discharged by a dust removal exhaust fan. Therefore, it can be seen that the heating device is one of the essential pieces of equipment in the application of coating machines.

[0004] One existing type of coating machine has operable cabinet doors on both sides. The air inlet of the coating machine consists of an equal-diameter pipe and a variable-diameter pipe connected vertically, with the air inlet located near one of the cabinet doors. The variable-diameter pipe is located inside the coating machine, with its outlet facing the rotatable screen roller inside the machine. The equal-diameter pipe extends upwards out of the coating machine. The heating device is connected to the equal-diameter pipe via a hot air duct, thereby supplying hot air to the air inlet. It should be noted that because some sections of the hot air duct are quite long, temperature loss may occur during the hot air delivery process, resulting in insufficient outlet temperature and affecting coating quality. Utility Model Content

[0005] To address the problem of heat loss during the transport of hot air within the hot air duct, this invention provides an electric heating structure for a solid coating machine. By adding an electric heating structure at the outlet of the hot air duct, i.e., inside the air inlet of the coating machine, the temperature loss is compensated, ensuring a stable outlet temperature.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] The solid coating machine has an electric heating structure installed in an air inlet consisting of a constant diameter pipe and a variable diameter pipe. An installation hole is provided on one side wall of the variable diameter pipe. A limit frame is provided around the installation hole. A cover plate for sealing the installation hole is detachably connected to the limit frame, which facilitates the installation and removal of the cover plate.

[0008] An electric heating tube is provided on the cover plate. The electric heating tube extends through the mounting hole into the inside of the variable diameter tube to facilitate heating of the airflow inside the variable diameter tube. An air distribution component is also provided on the cover plate. The air distribution component covers the electric heating tube and is spaced apart from the electric heating tube to facilitate the airflow to flow evenly to the electric heating tube. Hot air flows into the variable diameter tube from the equal diameter tube, passes through the air distribution component and the electric heating tube in sequence, and then enters the coating machine.

[0009] Furthermore, the mounting hole is a rectangular hole, and the limiting frame is a rectangular plate frame. The limiting frame is arranged on the outer wall of the reducing pipe, and multiple stiffening plates are also provided between the limiting frame and the side wall of the reducing pipe. The stiffening plates are triangular plates, which improves the reliability of the limiting frame installation.

[0010] Furthermore, the cover plate has a "[" shape in both its horizontal and vertical sections. The cover plate is fastened to the limiting frame, and hand-tightening bolts are provided on both the upper and lower sides of the cover plate. The hand-tightening bolts are inserted into the limiting frame. Tightening the hand-tightening bolts facilitates the assembly and disassembly of the cover plate.

[0011] Furthermore, the cover plate is provided with a handle, which is made of a plate with an "E" shaped cross-section. The handle facilitates manual movement of the cover plate.

[0012] Furthermore, the electric heating tube is a finned electric heating tube, which is bent into an "S" shape to facilitate sufficient heating of the airflow inside the variable diameter tube. The two ends of the electric heating tube extend out of the cover plate and are connected to the power cord.

[0013] Furthermore, the air distribution assembly includes two mounting rods and a perforated plate sleeved between the two mounting rods. The mounting rods are detachably connected to the cover plate. The perforated plate is bent into a semi-circle on both sides and sleeved on the mounting rods. The two mounting rods can stably support the perforated plate.

[0014] Furthermore, the mounting rod is a circular rod with a limiting ring on it. The front end of the mounting rod extends out of the cover plate and is connected to a nut. The nut, in conjunction with the limiting ring, clamps the cover plate, facilitating the assembly and disassembly of the mounting rod. The rear end of the mounting rod extends into the reducing pipe.

[0015] The beneficial effects of this utility model through the above technical solution are:

[0016] This utility model has a reasonable structural design, with a separate electric heating element installed inside the air inlet of the coating machine, which can play a role in end-point temperature compensation. The heating device supplies hot air, which may experience temperature loss during transport within the hot air duct. The electric heating element can compensate for this temperature loss in real time, ensuring that the hot air enters the coating machine at the set temperature.

[0017] The heating device of this invention does not require excessive heating to compensate for the temperature loss of the hot air duct; it only needs to maintain a base temperature. At this point, the electric heating element can supplement the heat as needed, reducing overall energy consumption. The electric heating element uses a finned design, which avoids obstructing airflow and promotes a more uniform temperature distribution.

[0018] The air distribution assembly of this invention covers the electric heating tube. Hot air first passes through a perforated plate and then through the electric heating tube. The perforated plate promotes the even dispersion of airflow towards the electric heating tube, improving the uniformity of airflow heating. The air distribution assembly, electric heating tube, and cover plate can be removed together from the reducing pipe for easy cleaning of the components. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the air inlet of an existing coating machine.

[0020] Figure 2 This is a schematic diagram showing the vertical arrangement of the electric heating tube and the air distribution component in the electric heating structure of the solid coating machine of this utility model.

[0021] Figure 3 This is a schematic diagram of the installation of the cover plate and the limiting frame of the electric heating structure of the solid coating machine of this utility model.

[0022] Figure 4 This is a schematic diagram showing the separation of the cover plate and the limiting frame in the electric heating structure of the solid coating machine of this utility model.

[0023] Figure 5 This is a top view of the electric heating tube installation in the electric heating structure of the solid coating machine of this utility model.

[0024] Figure 6 This is a schematic diagram showing the disassembled air distribution component of the electric heating structure of the solid coating machine of this utility model.

[0025] The attached diagram is labeled as follows: 1 Cabinet door, 2 Air inlet, 21 Equal diameter pipe, 22 Reducer pipe, 3 Screen roller, 4 Mounting hole, 5 Limiting frame, 6 Rib plate, 7 Cover plate, 8 Hand-tightening bolt, 9 Handle, 10 Electric heating element, 11 Wire, 12 Wire connector, 121 Male connector, 122 Female connector, 13 Power cord, 14 Side wall of the machine body, 15 Temperature sensor, 16 Mounting rod, 17 Perforated plate, 18 Limiting ring, 19 Nut. Detailed Implementation

[0026] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings:

[0027] like Figures 2-6As shown, the electric heating structure of the solid coating machine is installed inside the air inlet 2, which consists of a constant diameter pipe 21 and a variable diameter pipe 22. The hot air supplied by the heating device passes through the constant diameter pipe 21 and then through the variable diameter pipe 22 in the air inlet 2, and finally through the variable diameter pipe 22 to deliver the hot air to the perforated drum 3 inside the coating machine. The coating process takes place inside the rotating perforated drum 3.

[0028] The reducing pipe 22 has an approximate square-to-round structure. A mounting hole 4 is provided on one side wall of the reducing pipe 22. The mounting hole 4 is rectangular and is positioned opposite the cabinet door 1 on one side of the coating machine. The mounting hole 4 can be seen by opening the cabinet door 1. A limiting frame 5 is provided around the mounting hole 4. Therefore, the limiting frame 5 is a rectangular plate frame and is located on the outer wall of the reducing pipe 22, meaning it is not inside the reducing pipe 22.

[0029] To increase the structural strength of the limiting frame 5, multiple stiffening plates 6 are provided between the limiting frame 5 and the side wall of the reducing pipe 22. Specifically, stiffening plates 6 are provided on both the upper and lower sides of the limiting frame 5, with at least two stiffening plates 6 on each side. The stiffening plates 6 are triangular plates. The stiffening plates 6 are used to reconnect and fix the limiting frame 5 to the side wall of the reducing pipe 22, improving the reliability of the installation of the limiting frame 5.

[0030] A cover plate 7 is detachably connected to the limiting frame 5. The cover plate 7 has a "[" shape in both its horizontal and vertical sections. The cover plate 7 is fastened to the limiting frame 5, and can be used to close the mounting hole 4. When the cover plate 7 is removed from the limiting frame 5, it no longer closes the mounting hole 4.

[0031] During installation, the cover plate 7 has two hand-tightening bolts 8 on each of its upper and lower sides. These bolts 8 are inserted into the limiting frame 5 to connect the cover plate 7 to the limiting frame 5. Specifically, the hand-tightening bolts 8 are threaded onto the cover plate 7. A circular hole is made in the corresponding position on the limiting frame 5, and the hand-tightening bolts 8 are inserted into this hole to install the cover plate 7. Tightening the hand-tightening bolts 8 to disengage them from the circular hole allows the cover plate 7 to be removed from the limiting frame 5.

[0032] Note that: Since the limiting frame 5 has stiffening plates 6 on both the upper and lower sides, notches are made at corresponding positions on the upper and lower sides of the cover plate 7 to prevent the stiffening plates 6 from affecting the installation of the cover plate 7. The purpose is to allow the stiffening plates 6 to pass through, ensuring that the cover plate 7 can be smoothly fastened onto the limiting frame 5. At the same time, to facilitate manual operation of the cover plate 7, a handle 9 is provided on the cover plate 7. The handle 9 is made of a plate with an "E" shaped cross-section, making it easy to pick up the cover plate 7.

[0033] In this embodiment, an electric heating tube 10 is provided on the cover plate 7. The electric heating tube 10 is a finned electric heating tube. The electric heating tube 10 extends through the mounting hole 4 into the interior of the reducing pipe 22. The electric heating tube 10 is bent into an "S" shape, that is, the electric heating tube 10 is arranged in an "S" shape inside the reducing pipe 22 to increase the contact area with the hot air inside the reducing pipe 22. Through the electric heating tube 10 inside the reducing pipe 22, the hot air can be heated independently to compensate for temperature loss.

[0034] The electric heating element 10 extends from both ends of the cover plate 7 and is connected to the power cord 13, thereby supplying power to the electric heating element 10. Since the cover plate 7 needs to be disassembled and reassembled, and the electric heating element 10 moves with the cover plate 7, the power supply method of the electric heating element 10 needs to be plugged in and unplugged. Therefore, a wire connector 12 is used, which allows for quick connection and disconnection of the power supply.

[0035] Specifically, the electric heating element 10 is connected to a wire 11, which is connected to the power cord 13 via a wire connector 12. The wire connector 12 is existing technology and features quick connection and disconnection. The wire connector 12 includes a pluggable male connector 121 and a female connector 122. Here, the wire 11 is connected to the male connector 121, and the power cord 13 is connected to the female connector 122. The female connector 122 is mounted on the side wall 14 of the coating machine body and remains stationary.

[0036] Meanwhile, a temperature sensor 15 is installed inside the equal-diameter pipe 21 to monitor the temperature of the hot air inside the air inlet 2. In order to realize the power control of the electric heating tube 10, a thermostat and a solid-state relay are also provided. The thermostat receives the output temperature signal of the temperature sensor 15, compares it with its set temperature value, and can adjust the power of the electric heating tube 10 by controlling the solid-state relay.

[0037] The principle of this invention is as follows: hot air is supplied to the coating machine by a heating device, and the hot air flows into the coating machine through the air inlet 2. During the flow of hot air in the air inlet 2, the temperature sensor 15 monitors the temperature of the hot air in real time and transmits the signal to the temperature controller. When there is heat loss and the temperature in the air inlet 2 does not reach the set temperature, the temperature controller controls the solid-state relay to change the power of the electric heating element 10, thereby reheating the hot air to ensure that the temperature entering the coating machine meets the set temperature.

[0038] Since coating powder may drift onto the electric heating tube 10 during the coating process, the power supply to the electric heating tube 10 can be disconnected after the electric heating tube 10 has been running for a certain period of time. Then, the hand-tightening bolt 8 can be unscrewed to remove the cover plate 7. The cover plate 7 and the electric heating tube 10 can be removed together from the reducer tube 22 and then cleaned manually.

[0039] To optimize the product structure and ensure that hot air passes evenly through the electric heating tube 10, a uniform air distribution component is also provided on the cover plate 7. The uniform air distribution component covers the electric heating tube 10 and is spaced apart from the electric heating tube 10. In this way, hot air flows from the equal diameter pipe 21 into the variable diameter pipe 22, passes through the uniform air distribution component and the electric heating tube 10 in sequence, and then enters the coating machine.

[0040] The air distribution assembly includes two mounting rods 16 and a perforated plate 17 fitted between the two mounting rods 16. The two mounting rods 16 are arranged in parallel with a gap between them. The mounting rods 16 are circular rods and are detachably connected to the cover plate 7. A limit ring 18 is provided on the mounting rod 16. The rear end of the mounting rod 16 extends into the reducer 22, and the front end of the mounting rod 16 extends out of the cover plate 7 and is connected to a nut 19. After tightening the nut 19, the nut 19 and the limit ring 18 clamp the cover plate 7, thereby fixing the mounting rod 16 on the cover plate 7.

[0041] The perforated plate 17 is bent into a semi-circle on both sides and is fitted onto the mounting rod 16 on both sides. One end of the perforated plate 17 abuts against the limiting ring 18. In this way, the hot air entering the reducing pipe 22 first passes through the perforated plate 17, and the action of the perforated plate 17 ensures that the hot air flows evenly to the electric heating tube 10.

[0042] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. An electric heating structure for a solid coating machine, installed inside an air inlet (2) composed of a constant-diameter pipe (21) and a variable-diameter pipe (22), characterized in that, The reducing pipe (22) has an installation hole (4) on one side wall. A limit frame (5) is provided around the installation hole (4). A cover plate (7) for sealing the installation hole (4) is detachably connected to the limit frame (5). An electric heating tube (10) is provided on the cover plate (7). The electric heating tube (10) extends through the mounting hole (4) into the inside of the reducing pipe (22). An air distribution component is also provided on the cover plate (7). The air distribution component covers the electric heating tube (10) and is spaced apart from the electric heating tube (10). Hot air flows from the equal diameter pipe (21) into the reducing pipe (22), passes through the air distribution component and the electric heating tube (10) in sequence, and then enters the coating machine.

2. The electric heating structure for a solid coating machine according to claim 1, characterized in that, The mounting hole (4) is a rectangular hole, and the limiting frame (5) is a rectangular plate frame. The limiting frame (5) is arranged on the outer wall of the reducing pipe (22). A plurality of stiffening plates (6) are also provided between the limiting frame (5) and the side wall of the reducing pipe (22). The stiffening plates (6) are triangular plates.

3. The electric heating structure for a solid coating machine according to claim 2, characterized in that, The cover plate (7) has a horizontal and vertical cross section in the shape of "[". The cover plate (7) is fastened on the limiting frame (5). The cover plate (7) is provided with hand-tightening bolts (8) on both the upper and lower sides. The hand-tightening bolts (8) are inserted into the limiting frame (5).

4. The electric heating structure for a solid coating machine according to claim 1, characterized in that, The cover plate (7) is provided with a handle (9), which is made of a plate with an "E" shaped cross section.

5. The electric heating structure for a solid coating machine according to claim 1, characterized in that, The electric heating tube (10) is a finned electric heating tube. The electric heating tube (10) is bent into an "S" shape. Both ends of the electric heating tube (10) extend out of the cover plate (7) and are connected to the power cord (13).

6. The electric heating structure for a solid coating machine according to claim 1, characterized in that, The uniform airflow assembly includes two mounting rods (16) and a perforated plate (17) sleeved between the two mounting rods (16). The mounting rods (16) are detachably connected to the cover plate (7). The perforated plate (17) is bent into a semi-circle on both sides and is sleeved on the mounting rods (16) on both sides.

7. The electric heating structure for a solid coating machine according to claim 6, characterized in that, The mounting rod (16) is a circular rod with a limiting ring (18) on it. The front end of the mounting rod (16) extends out of the cover plate (7) and is connected to a nut (19). The nut (19) cooperates with the limiting ring (18) to clamp the cover plate (7). The rear end of the mounting rod (16) extends into the reducing pipe (22).

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