Uniform coating device for surface coating of release film

Abstract

The invention discloses a release film surface coating uniform coating device, and relates to the technical field of release film production, the release film surface coating uniform coating device comprises a rack, the rack is provided with a stable conveying assembly, a coating assembly, a pre-curing assembly and a laser thickness gauge, the coating assembly comprises a first sliding rail, one side of the first sliding rail is slidably connected with a second sliding rail, and the second sliding rail is slidably connected with a second sliding rail; and a sliding block is slidably connected to the outer side of the second sliding rail, a coating head is fixedly connected to one side of the sliding block, a scraper is fixedly connected to the bottom of the coating head, and a coating roller is installed on the first sliding rail. According to the uniform coating device for the surface coating of the release film, precise control over the parallelism and the gap of the coating head and the scraper relative to the coating roller is achieved through a precise adjusting mechanism composed of a first sliding rail, a second sliding rail and a sliding block, and a uniform feeding system composed of a buffer tank with a metal filter screen and a heating sleeve and a constant-pressure feeding pump is combined; and the uniformity and consistency of the thickness of the coating are guaranteed from a mechanical structure and a feeding source.

Description

Technical Field

[0001] This invention relates to the field of release film production, and in particular to a device for uniformly coating the surface of release film. Background Technology

[0002] Release film production refers to the manufacturing process of a functional film with a stable release force formed on the surface of a substrate such as polyester film or polyethylene film by uniformly coating a coating solution containing release agents such as silicone oil and fluorine through a coating machine, followed by drying and curing.

[0003] In the production of release films, the uniformity of the surface coating is crucial to product performance. However, existing coating devices have mechanical structural design defects, such as a rough coating head structure leading to low thickness control accuracy, a single feeding system resulting in uneven coating distribution, unstable film material conveying leading to coating range deviation, and the lack of a real-time monitoring and feedback structure making it difficult to correct defects, thus failing to meet production requirements. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a uniform coating device for release film surface coating, comprising a frame, wherein a stable conveying component, a coating component, a pre-curing component and a laser thickness gauge are arranged on the frame; The coating assembly includes a first slide rail, a second slide rail slidably connected to one side of the first slide rail, a slider slidably connected to the outer side of the second slide rail, a coating head fixedly connected to one side of the slider, a scraper fixedly connected to the bottom of the coating head, a coating roller mounted on the first slide rail, a buffer tank fixedly connected to the side of the slider away from the coating head, a constant pressure feed pump fixedly connected to the outer side of the buffer tank, a connecting pipe fixedly connecting the buffer tank and the coating head, a regulating valve and a flow sensor connected inside the connecting pipe, a level gauge fixedly connected inside the buffer tank, and a magnetic stirrer installed inside the buffer tank.

[0005] Preferably, an unwinding roller is installed on the top of the frame, a drive motor and a PLC controller are fixedly connected to the outside of the frame, and a take-up roller and a positioning roller are installed on the top of the frame.

[0006] Preferably, there are two take-up rollers, which are located on both sides of the positioning roller. Each of the two take-up rollers is fixedly connected to a secondary gear on the side closest to the drive motor. The output shaft of the drive motor is fixedly connected to a main gear, and the two sides of the main gear mesh with the opposite sides of the two secondary gears respectively.

[0007] Preferably, there are two first slide rails, which are symmetrically fixedly connected to the top of the frame. The second slide rail is slidably connected between the two first slide rails. The coating head has a hollow cavity design and the inner wall is polished. The inner cavity width of the coating head is the same as that of the coating roller. The first slide rail has an installation groove. The outer side of the coating roller is rotatably connected to a movable plate. The side of the movable plate away from the coating roller is fixedly connected to a movable block extending into the installation groove. A spring is fixedly connected between the movable block and the inner bottom wall of the installation groove. Limiting blocks that are slidably connected to the first slide rail are fixedly connected to both sides of the movable block.

[0008] Preferably, the inner wall of the buffer tank is polished and a metal filter screen is provided at the opening of the connecting pipe, and the outer layer of the buffer tank is provided with a heating jacket.

[0009] Preferably, the stable conveying assembly includes two mounting plates, a fixed roller rotatably connected between the two mounting plates, a slide block slidably connected to the inner side of each mounting plate, an electric push rod fixedly connected to the top of each mounting plate, a tension roller rotatably connected to the slide block, a through-beam photoelectric sensor fixedly connected to the frame, a threaded rod mounted on the bottom of the frame via a bearing, a threaded block threadedly connected to the outer side of the threaded rod, a servo motor fixedly connected to one side of the threaded rod, a guide rod fixedly connected to the bottom of the frame, a correction roller mounted on the top of the threaded block, and a conveying roller mounted on the top of the frame.

[0010] Preferably, the two mounting plates are symmetrically fixedly connected to the top of the frame, the output end of the electric push rod is fixedly connected to the top of the slide, the through-beam photoelectric sensor consists of a transmitter and a receiver separated from the top and bottom, the transmitter and receiver are respectively installed on both sides of the release film material conveying path and precisely aligned, one side of the threaded block is slidably connected to the guide rod, the top of the threaded block is fixedly connected to a retainer, the correction roller is rotatably connected to the inside of the retainer, and the surface of the correction roller is covered with nitrile rubber.

[0011] Preferably, the pre-curing component includes a curing chamber, an infrared heating tube and a temperature sensor are fixedly connected inside the curing chamber, a high-temperature resistant roller is rotatably connected inside the curing chamber, and a laser thickness gauge is fixedly connected to the outside of the curing chamber, with the laser thickness gauge installed at an angle to the direction of release film material transmission.

[0012] Preferably, the curing chamber is fixedly connected to the top of the frame, and the drive motor, electric push rod, servo motor, constant pressure feed pump, regulating valve, flow sensor, level gauge, magnetic stirrer, infrared heating tube, temperature sensor and laser thickness gauge respectively feed back the detection signals to the PLC controller or receive its instructions.

[0013] In summary, the present invention provides a device for uniformly coating a release film surface, which has the following beneficial effects: 1. The uniform coating device for the release film surface coating achieves precise control of the parallelism and gap between the coating head and the scraper relative to the coating roller through a precision adjustment mechanism consisting of a first slide rail, a second slide rail and a slider. Combined with a buffer tank with a metal filter and a heating jacket and a constant pressure feeding pump, the uniformity and consistency of the coating thickness are guaranteed from the mechanical structure and the feeding source.

[0014] 2. The uniform coating device for the release film surface uses an electric push rod in the stable conveying component to drive the tension roller for dynamic tension control, and uses a through-beam photoelectric sensor to detect and cooperate with a servo motor-driven correction roller for lateral position correction. Together, they form a high-response tension and correction closed-loop control system, which ensures that the release film remains flat and centered before entering the coating area, fundamentally eliminating coating defects caused by film wrinkles or deviation, and providing stable substrate conditions for obtaining high-quality coatings.

[0015] 3. The uniform coating device for the release film surface uses an infrared heating tube and temperature sensor in the curing chamber to achieve controllable and uniform pre-curing of the coating. The thickness is monitored immediately after curing by a laser thickness gauge with an optimized installation angle. All these execution and sensing components are integrated into the PLC controller, which ultimately builds a fully automated intelligent control system from unwinding, coating, curing to inspection, which significantly improves the production accuracy, stability and intelligence level of the entire coating device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of another axial integral structure of the present invention; Figure 3 This is a partial structural diagram of the connection between the stable transmission component and the frame of the present invention; Figure 4 This is a schematic diagram of the connection between the threaded block and the guide rod of the present invention; Figure 5 This is a schematic diagram of the structure of the coating component of the present invention; Figure 6 This is a partial structural diagram of the connection between the first slide rail and the coating roller of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of the interior of the buffer container of the present invention; Figure 9 This is a schematic diagram of the internal structure of the curing chamber of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Frame; 101. Unwinding Roller; 102. Drive Motor; 103. Rewinding Roller; 104. Positioning Roller; 105. PLC Controller; 2. Stabilizing Conveyor Assembly; 201. Mounting Plate; 202. Fixed Roller; 203. Slide; 204. Electric Push Rod; 205. Tensioning Roller; 206. Through-beam Photoelectric Sensor; 207. Threaded Rod; 208. Threaded Block; 209. Servo Motor; 210. Guide Rod; 211. Correcting Roller; 212. Conveyor Roller; 3. Coating Assembly Components; 301, First slide rail; 302, Second slide rail; 303, Slider; 304, Coating head; 305, Scraper; 306, Coating roller; 307, Buffer tank; 308, Constant pressure feed pump; 309, Connecting pipe; 310, Regulating valve; 311, Flow sensor; 312, Level gauge; 313, Magnetic stirrer; 4, Pre-curing assembly; 401, Curing chamber; 402, Infrared heating tube; 403, Temperature sensor; 404, High temperature resistant roller; 5, Laser thickness gauge. Detailed Implementation

[0018] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Example

[0019] Please see Figure 1 , Figure 2 , Figure 5 and Figure 6 A uniform coating device for release film surface coating includes a frame 1, on which a coating component 3 is disposed; The coating assembly 3 includes a first slide rail 301, a second slide rail 302 slidably connected to one side of the first slide rail 301, a slider 303 slidably connected to the outer side of the second slide rail 302, a coating head 304 fixedly connected to one side of the slider 303, a scraper 305 fixedly connected to the bottom of the coating head 304, a coating roller 306 mounted on the first slide rail 301, a buffer tank 307 fixedly connected to the side of the slider 303 away from the coating head 304, a constant pressure feed pump 308 fixedly connected to the outer side of the buffer tank 307, a connecting pipe 309 fixedly connecting the buffer tank 307 and the coating head 304, a regulating valve 310 and a flow sensor 311 connected inside the connecting pipe 309, a level gauge 312 fixedly connected inside the buffer tank 307, and a magnetic stirrer 313 installed inside the buffer tank 307.

[0020] The top of the frame 1 is equipped with an unwinding roller 101, and the outside of the frame 1 is fixedly connected with a drive motor 102 and a PLC controller 105. The top of the frame 1 is also equipped with a take-up roller 103 and a positioning roller 104.

[0021] By setting up the unwinding roller 101, the winding roller 103, and the positioning roller 104, and working in coordination with the drive motor 102 and the PLC controller 105, the entire process of unwinding, conveying and winding of the release film is mechanized and automated, laying the foundation for the continuous and stable operation of the entire device.

[0022] There are two take-up rollers 103, which are located on both sides of the positioning roller 104. Each of the two take-up rollers 103 has a secondary gear fixedly connected to the side of the drive motor 102. The output shaft of the drive motor 102 is fixedly connected to the main gear. The two sides of the main gear mesh with the opposite sides of the two secondary gears respectively.

[0023] By simultaneously driving the auxiliary gears on the two take-up rollers 103 with the main gear on the output shaft of the drive motor 102, the dual-station take-up function is realized, which allows the equipment to quickly switch to another station after completing the take-up at one station, effectively improving the efficiency and capacity of continuous operation.

[0024] Two first slide rails 301 are symmetrically and fixedly connected to the top of the frame 1. A second slide rail 302 is slidably connected between the two first slide rails 301. The coating head 304 has a hollow cavity design and a polished inner wall. The inner cavity width of the coating head 304 is the same as that of the coating roller 306. An installation groove 3011 is provided on the first slide rail 301. A movable plate 3061 is rotatably connected to the outer side of the coating roller 3061. A movable block 3062 extending into the installation groove 3011 is fixedly connected to the side of the movable plate 3061 away from the coating roller 306. A spring 3063 is fixedly connected between the movable block 3062 and the inner bottom wall of the installation groove 3011. Limiting blocks that are slidably connected to the first slide rail 301 are fixedly connected to both sides of the movable block 3062.

[0025] By connecting the coating head 304 to the second slide rail 302 and the first slide rail 301 via the slider 303, the coating head 304 can be precisely adjusted in two dimensions: parallel to the axis of the coating roller 306 and perpendicular to the surface of the film. This allows for precise setting of the parallelism and gap between the doctor blade 305 and the coating roller 306, ensuring the uniformity of the coating thickness. By opening an installation groove 3011 on the first slide rail 301 and setting a movable plate 3061 on the outside of the coating roller 306 that is elastically connected to the installation groove via a movable block 3062 and a spring 3063, and by using a limiting block to ensure that the movable block 3062 slides stably along the installation groove 3011, a floating buffer mechanism is formed. This mechanism allows the coating roller 306 to make a slight adaptive vertical float when encountering sudden changes in film thickness or foreign objects, and to quickly reset via the spring 3063. This not only effectively avoids jamming or scratching the film, but also complements the precision adjustment system formed by the first slide rail 301 and the second slide rail 302.

[0026] The inner wall of the buffer tank 307 is polished and a metal filter is provided at the opening of the connecting pipe 309. The outer layer of the buffer tank 307 is provided with a heating jacket.

[0027] By installing a metal filter screen at the inlet of the connecting pipe 309 of the buffer tank 307 and polishing its inner wall, particulate impurities in the adhesive are effectively filtered out and residues are reduced. The heating jacket installed on the outer layer of the buffer tank 307 can maintain the temperature of the adhesive. The two work together to ensure that the adhesive supplied to the coating head 304 is pure and has a consistent viscosity, thus improving the coating quality from the source. Example

[0028] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A stable transmission component 2 is installed on the rack 1; The stable conveying assembly 2 includes two mounting plates 201, with a fixed roller 202 rotatably connected between the two mounting plates 201. A slide block 203 is slidably connected to the inner side of the mounting plates 201. An electric push rod 204 is fixedly connected to the top of the mounting plates 201. A tension roller 205 is rotatably connected to the slide block 203. A through-beam photoelectric sensor 206 is fixedly connected to the frame 1. A threaded rod 207 is mounted on the bottom of the frame 1 via a bearing. A threaded block 208 is threadedly connected to the outer side of the threaded rod 207. A servo motor 209 is fixedly connected to the bottom of the frame 1 and fixedly connected to one side of the threaded rod 207. A guide rod 210 is fixedly connected to the bottom of the frame 1. A correction roller 211 is mounted on the top of the threaded block 208. A conveying roller 212 is mounted on the top of the frame 1.

[0029] The tension roller 205 on the slide block 203 is raised and lowered by the electric push rod 204, realizing the dynamic adjustment of the film tension. At the same time, the position of the film edge is detected by the through-beam photoelectric sensor 206, and the threaded rod 207 is driven by the servo motor 209 to drive the correction roller 211 to move laterally, forming a complete tension and correction closed-loop control system, which ensures that the release film is always flat and centered during the coating process, without wrinkles or deviation.

[0030] Two mounting plates 201 are symmetrically fixedly connected to the top of the frame 1. The output end of the electric push rod 204 is fixedly connected to the top of the slide 203. The through-beam photoelectric sensor 206 consists of a transmitter and a receiver separated from the top and bottom. The transmitter and receiver are respectively installed on both sides of the release film material conveying path and are precisely aligned. One side of the threaded block 208 is slidably connected to the guide rod 210. A retainer is fixedly connected to the top of the threaded block 208. The correction roller 211 is rotatably connected to the inside of the retainer. The surface of the correction roller 211 is covered with nitrile rubber.

[0031] The fixed connection between the electric push rod 204 and the slide 203 ensures the reliability of tension adjustment; the separate design of the through-beam photoelectric sensor 206 enables non-contact and accurate detection of the membrane edge; and the nitrile rubber coating on the surface of the correction roller 211 increases the friction with the membrane, ensuring the effective execution of the correction action while avoiding scratches on the membrane surface. Example

[0032] Please see Figure 1 , Figure 2 and Figure 7 The frame 1 is equipped with a pre-curing component 4 and a laser thickness gauge 5; The pre-curing component 4 includes a curing box 401. An infrared heating tube 402 and a temperature sensor 403 are fixedly connected inside the curing box 401. A high-temperature resistant roller 404 is rotatably connected inside the curing box 401. A laser thickness gauge 5 is fixedly connected to the outside of the curing box 401. The laser thickness gauge 5 is installed at an angle to the direction of release film material transfer.

[0033] The infrared heating tube 402 inside the curing chamber 401 provides a uniform heat source, which is monitored in real time by the temperature sensor 403. Combined with the high-temperature resistant roller 404 supporting the release film, controllable and uniform pre-curing of the coating is achieved. The laser thickness gauge 5 is installed at an angle to the direction of the release film, which effectively avoids the interference of the release film surface reflection on the measurement, thereby ensuring the accuracy of the thickness detection data.

[0034] The curing chamber 401 is fixedly connected to the top of the frame 1. The drive motor 102, electric push rod 204, servo motor 209, constant pressure feed pump 308, regulating valve 310, flow sensor 311, level gauge 312, magnetic stirrer 313, infrared heating tube 402, temperature sensor 403 and laser thickness gauge 5 respectively feed back the detection signals to the PLC controller 105 or receive its instructions.

[0035] The curing box 401 is fixed to the top of the frame 1 and connected to the PLC controller 105 along with the drive motor 102, electric push rod 204, servo motor 209, constant pressure feed pump 308, various sensors and laser thickness gauge 5. This realizes centralized automated control and closed-loop feedback of the entire process from unwinding, tension correction, feeding, coating, pre-curing to thickness monitoring, which improves the accuracy, stability and intelligence of the entire coating system.

[0036] During operation, after the device is started, the release film roll is first released by the unwinding roller 101 and enters the area of ​​the stable conveying component 2. Here, the film roll passes sequentially around the fixed roller 202 and the tensioning roller 205. The through-beam photoelectric sensor 206 detects the film edge position in real time. If deviation is detected, the signal is immediately fed back to the PLC controller 105, which controls the servo motor 209 to drive the threaded rod 207 to move the correction roller 211 laterally, achieving precise correction. At the same time, the electric push rod 204 dynamically adjusts the height of the tensioning roller 205 according to the system tension requirements to ensure that the film roll is conveyed smoothly under constant tension. After passing through the stabilized film roll, it enters the coating station. The constant pressure feed pump 308 pumps the adhesive from the buffer tank 307 and delivers it to the coating head 304 through the connecting pipe 309. The magnetic stirrer 313 continuously stirs to prevent sedimentation. The flow sensor 311 and the regulating valve 310 ensure uniform and stable feeding. After the adhesive spreads in the coating head cavity, it settles on the scraper at the bottom of the coating head 304. The coating head is evenly transferred to the film surface through a precision slit formed by the coating head 305 and the uniformly rotating coating roller 306. The initial position of the coating head can be precisely preset and finely adjusted by the first slide rail 301, the second slide rail 302 and the slider 303. The coated film then enters the curing chamber 401 of the pre-curing component 4. The infrared heating tube 402 provides uniform heat under the monitoring of the temperature sensor 403 to pre-cur the wet coating. The film is supported by the high-temperature resistant roller 404. After curing, the film travels to the end. The laser thickness gauge 5, which is installed outside the outlet of the curing chamber 401 and arranged at an angle to the film, performs real-time multi-point scanning detection of the dry film thickness. The thickness data is fed back to the PLC controller 105 in real time. If a deviation is found, the system can automatically adjust the gap of the coating head 304 or the parameters of the feeding system for dynamic compensation. Finally, the high-quality release film that has been coated and cured is neatly wound up by the winding roller 103 under the drive of the drive motor 102.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A uniform coating device for release film surface coating, comprising a frame (1), characterized in that: The frame (1) is equipped with a stable conveying component (2), a coating component (3), a pre-curing component (4) and a laser thickness gauge (5). The coating assembly (3) includes a first slide rail (301), a second slide rail (302) slidably connected to one side of the first slide rail (301), a slider (303) slidably connected to the outer side of the second slide rail (302), a coating head (304) fixedly connected to one side of the slider (303), a scraper (305) fixedly connected to the bottom of the coating head (304), a coating roller (306) mounted on the first slide rail (301), and the slider (303) being away from the coating head ( A buffer tank (307) is fixedly connected to one side of the coating head (304). A constant pressure feed pump (308) is fixedly connected to the outside of the buffer tank (307). A connecting pipe (309) is fixedly connected between the buffer tank (307) and the coating head (304). A regulating valve (310) and a flow sensor (311) are connected inside the connecting pipe (309). A level gauge (312) is fixedly connected inside the buffer tank (307). A magnetic stirrer (313) is installed inside the buffer tank (307).

2. The uniform coating device for release film surface coating according to claim 1, characterized in that: The top of the frame (1) is equipped with an unwinding roller (101), and the outside of the frame (1) is fixedly connected with a drive motor (102) and a PLC controller (105). The top of the frame (1) is equipped with a winding roller (103) and a positioning roller (104).

3. The uniform coating device for release film surface coating according to claim 2, characterized in that: There are two take-up rollers (103) located on both sides of the positioning roller (104). Each of the two take-up rollers (103) has a secondary gear fixedly connected to the side of the drive motor (102). The output shaft of the drive motor (102) is fixedly connected to a main gear. The two sides of the main gear mesh with the opposite sides of the two secondary gears respectively.

4. The uniform coating device for release film surface coating according to claim 1, characterized in that: Two first slide rails (301) are symmetrically fixedly connected to the top of the frame (1). The second slide rail (302) is slidably connected between the two first slide rails (301). The coating head (304) has a hollow cavity design and the inner wall is polished. The inner cavity width of the coating head (304) is the same as that of the coating roller (306). The first slide rail (301) is provided with an installation groove (3011). The outer side of the coating roller (3061) is rotatably connected to a movable plate (3061). The side of the movable plate (3061) away from the coating roller (306) is fixedly connected to a movable block (3062) extending into the installation groove (3011). A spring (3063) is fixedly connected between the movable block (3062) and the inner bottom wall of the installation groove (3011). Both sides of the movable block (3062) are fixedly connected to limiting blocks that are slidably connected to the first slide rail (301).

5. The uniform coating device for release film surface coating according to claim 1, characterized in that: The inner wall of the buffer tank (307) is polished and a metal filter is provided at the opening of the connecting pipe (309). The outer layer of the buffer tank (307) is provided with a heating jacket.

6. The uniform coating device for release film surface coating according to claim 2, characterized in that: The stable conveying assembly (2) includes two mounting plates (201), a fixed roller (202) is rotatably connected between the two mounting plates (201), a slide block (203) is slidably connected to the inner side of the mounting plate (201), an electric push rod (204) is fixedly connected to the top of the mounting plate (201), a tension roller (205) is rotatably connected to the slide block (203), a through-beam photoelectric sensor (206) is fixedly connected to the frame (1), a threaded rod (207) is installed at the bottom of the frame (1) through a bearing, a threaded block (208) is threadedly connected to the outer side of the threaded rod (207), a servo motor (209) is fixedly connected to one side of the threaded rod (207) at the bottom of the frame (1), a guide rod (210) is fixedly connected to the bottom of the frame (1), a correction roller (211) is installed at the top of the threaded block (208), and a conveying roller (212) is installed at the top of the frame (1).

7. The uniform coating device for release film surface coating according to claim 6, characterized in that: Two mounting plates (201) are symmetrically fixedly connected to the top of the frame (1). The output end of the electric push rod (204) is fixedly connected to the top of the slide (203). The through-beam photoelectric sensor (206) consists of an upper and lower separate transmitter and receiver. The transmitter and receiver are respectively installed on both sides of the release film material conveying path and are precisely aligned. One side of the threaded block (208) is slidably connected to the guide rod (210). A card seat is fixedly connected to the top of the threaded block (208). The correction roller (211) is rotatably connected to the inside of the card seat. The surface of the correction roller (211) is covered with nitrile rubber.

8. The uniform coating device for release film surface coating according to claim 6, characterized in that: The pre-curing component (4) includes a curing box (401), an infrared heating tube (402) and a temperature sensor (403) are fixedly connected inside the curing box (401), a high-temperature resistant roller (404) is rotatably connected inside the curing box (401), and a laser thickness gauge (5) is fixedly connected to the outside of the curing box (401). The laser thickness gauge (5) is installed at an angle to the direction of release film material transmission.

9. The uniform coating device for release film surface coating according to claim 8, characterized in that: The curing chamber (401) is fixedly connected to the top of the frame (1). The drive motor (102), electric push rod (204), servo motor (209), constant pressure feed pump (308), regulating valve (310), flow sensor (311), level gauge (312), magnetic stirrer (313), infrared heating tube (402), temperature sensor (403) and laser thickness gauge (5) respectively feed back the detection signals to the PLC controller (105) or receive its instructions.

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