PET bottle preform heating and equalizing device

Abstract

The utility model relates to a kind of PET bottle embryo heating equalizing device, including box, box is set to cylindrical structure and is respectively set with feed inlet and discharge outlet on side wall face, feed inlet and discharge outlet are set with conveyor belt at center, the both ends of conveyor belt are extended to the outside of feed inlet and discharge outlet respectively and there are several bottle embryos in top end in sequence, and the bottom of conveyor belt is also equipped with driving assembly;Electric heating assembly is also equipped on the inner wall of box;The design of the application is combined with annular conveying and autorotation driving structure, fundamentally solve the contradiction of " neck overheat deformation, bottom heating deficiency", " gradual heating process" avoids surface degradation or internal stress concentration caused by bottle embryo sudden heating, further improves heating stability, reduces forming defect rate, simultaneously, ring airflow can balance the temperature of different areas in box, reduce temperature gradient, further assist bottle embryo uniform heating, avoid workshop environment temperature rise caused by heat loss, improve operation comfort.

Description

Technical Field

[0001] This utility model relates to the technical field of PET bottle production equipment, specifically to a PET preform heating equalization device. Background Technology

[0002] Currently, most mainstream PET preform heating devices in the industry adopt a box-type fixed heating structure. The preforms are transported into a sealed box via a conveyor belt, and heat is supplied using electric heating tubes arranged around the box walls. However, this type of device has many technical shortcomings in practical applications, making it difficult to meet the demands of high-quality production. The problem of uneven heating of the preform is prominent: the heat generated by the electric heating tube easily creates local temperature differences in the chamber, resulting in significant differences in heating of different parts of the preform sidewall (the temperature is higher on the side closer to the heating tube and lower on the side farther away); at the same time, the heat conduction requirements of the preform neck (narrow diameter structure), bottom (thick wall structure) and sidewall are different. In a static state, special parts cannot form a uniform heat exchange with the heat source, further exacerbating the contradiction of "overheating and deformation of the neck and insufficient heating of the bottom", which directly affects the blow molding effect. Lack of zoned temperature regulation capability: Existing devices mostly use electric heating elements with uniform power or fixed temperature settings, without differentiated design for the heating needs of different parts of the preform. In actual production, the bottom of the preform requires a higher temperature to ensure sufficient softening due to its thicker wall, while the neck, due to its slender structure, requires a lower temperature to avoid over-melting. The uniform heating mode cannot adapt to these differentiated needs, often resulting in problems such as "insufficient softening at the bottom leading to inability to stretch during blow molding" or "overheating at the neck causing adhesion to the conveyor belt," reducing production stability. Inadequate temperature monitoring and feedback mechanisms: Most devices only indirectly monitor the heating effect through ambient temperature sensors inside the chamber, failing to accurately obtain the actual temperatures of the neck, upper, lower, and bottom of the preform. Heating parameter adjustment relies on manual experience, lacking real-time temperature feedback and automatic adjustment mechanisms, easily leading to "overheating (preform surface discoloration, raw material degradation)" or "underheating (preform high hardness, incomplete blow molding)," resulting in significant fluctuations in product qualification rates and difficulty in meeting the precision requirements of large-scale production. Low heat utilization efficiency and uneven temperature distribution: Some devices do not have an effective hot air circulation structure. The heat generated by the electric heating tube is easy to accumulate locally in the chamber (such as the temperature in the area near the heating tube is too high) or dissipate with the airflow (heat leakage through the gaps in the chamber). This not only wastes energy, but also causes obvious temperature gradients in different areas of the chamber, further amplifying the problem of uneven heating of the preform. At the same time, heat loss will also increase the ambient temperature of the workshop, affecting the comfort of production operations. In summary, existing PET preform heating devices have significant shortcomings in core technologies such as preform rotation drive, zoned temperature control, precise temperature measurement, and heat recycling. These shortcomings result in poor preform heating uniformity, unstable molding quality, and high energy consumption, making it difficult to meet the current PET bottle industry's production requirements of "high quality, high efficiency, and low energy consumption." Developing a heating device that can achieve uniform heating and precise temperature control of preforms has become a critical technological bottleneck that the industry urgently needs to overcome. Utility Model Content

[0003] Based on the above description, this utility model provides a PET preform heating equalization device to solve the obvious defects of existing PET preform heating devices in core technical aspects such as preform self-rotation drive, zoned temperature control, precise temperature measurement, and heat recycling, which result in poor preform heating uniformity, unstable molding quality, and high energy consumption.

[0004] This utility model is achieved through the following technical solution: A PET preform heating equalization device includes a box body, which is cylindrical in shape and has an inlet and an outlet on its side walls. The inlet and outlet are interconnected and a conveyor belt is located at the center. The two ends of the conveyor belt extend to the outside of the inlet and outlet, respectively, and a number of preforms are arranged sequentially at the top. A drive assembly is also provided at the bottom of the conveyor belt, and the top of the drive assembly extends to the surface of the conveyor belt and drives the preforms to rotate. An electric heating assembly is also provided on the inner wall of the box body. The electric heating assembly is arranged in a ring along the inner wall of the box body and maintains a gap with the side wall of the preforms.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Furthermore, the drive assembly includes a mounting groove on the conveyor belt, in which an adjustment seat is movably mounted via ball bearings. The top of the adjustment seat is provided with a spring collet, which is tilted upwards and unfolded so that its inner wall is tightly fitted with the bottom surface of the preform. The bottom of the adjustment seat is also provided with friction wheels, and multiple friction wheels are interconnected and driven by each other. One of the friction wheels is also equipped with a servo motor.

[0007] Furthermore, a gas injection pipe is vertically installed at the center of the adjusting seat, with its top and bottom ends extending to the top and bottom surfaces of the adjusting seat and arranged concentrically with the preform.

[0008] Furthermore, the electric heating assembly includes an arc-shaped channel disposed inside the housing and connecting the inlet and outlet. Several mounting plates are arranged sequentially at intervals on the side wall of the arc-shaped channel. Each mounting plate is vertically provided with multiple electric heating tubes, which are respectively arranged at the neck, upper, lower and bottom positions of the preform. The heating temperature of the electric heating tubes on the mounting plate increases sequentially from the inlet to the outlet.

[0009] Furthermore, the box body is also provided with a circulating air duct and is arranged on the side away from the arc-shaped channel. The top of the box body is provided with an interface and is connected to the circulating air duct. A plug plate is vertically arranged in the plug plate, and an exhaust fan is fixedly installed on the plug plate. When the plug plate is inserted into the plug plate, the exhaust fan is located inside the circulating air duct.

[0010] Furthermore, multiple infrared thermometers are arranged on the inner wall of the arc-shaped channel, with the multiple infrared thermometers positioned close to the neck, upper part, lower part, and bottom of the preform, respectively.

[0011] Furthermore, the surface of the enclosure is also equipped with a controller, which is electrically connected to the infrared thermometer and the electric heating component via wires, and the controller is remotely controlled by the drive source of the servo motor and the conveyor belt via a Bluetooth module.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This application improves upon existing PET preform heating equipment by adopting a design that combines a ring conveyor and a self-rotating drive structure. This design not only ensures that the preform sidewalls are in 360° contact with the heat source without any dead angles, avoiding the positional difference of "overheating on the side closer to the heating tube and underheating on the side farther away," but also maintains a reasonable gap with the preform sidewalls to form a "ring heat source field." Combined with the preform's self-rotation, this allows heat to be evenly distributed throughout the preform, while avoiding the problem of "local heat concentration in the fixed heating tube." This fundamentally solves the contradiction of "overheating and deformation at the neck and insufficient heating at the bottom," laying the foundation for consistent wall thickness in blow molding. 2. In this application, in response to the structural difference of the preform's "narrow neck and thick bottom", the device adopts a differentiated heating design. Multiple electric heating tubes correspond to the neck, upper, lower and bottom positions of the preform, respectively. The temperature of different parts can be adjusted individually, perfectly adapting to the heat conduction requirements of each part, and solving the defect of the existing device that "uniform heating cannot take into account different parts". In addition, the temperature of the electric heating tubes increases sequentially from the inlet to the outlet, forming a "gradual heating process", avoiding surface degradation or internal stress concentration caused by sudden heating of the preform, further improving heating stability and reducing the molding defect rate. 3. In this application, a circulating air duct is set on the side away from the arc-shaped channel. The exhaust fan in the top plug interface can drive the air in the chamber to circulate between the air duct and the heating area, avoiding local heat accumulation near the heating tube and reducing heat loss from the gaps in the chamber. Compared with the existing non-circulating device, energy consumption can be reduced by 15%-20%, which meets the "low energy consumption" production requirements. At the same time, the circulating air can balance the temperature of different areas in the chamber, reduce the temperature gradient, further assist the preform to be heated evenly, avoid the increase in workshop ambient temperature due to heat loss, and improve the comfort of operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the box structure in this embodiment; Figure 2 This is a schematic diagram of the internal structure of the box in this embodiment; Figure 3 This is a schematic diagram of the driving component in this embodiment; Figure 4 This is a schematic diagram of the structure of the electric heating component in this embodiment; The components are as follows: 1. Box body; 11. Inlet; 12. Outlet; 13. Circulating air duct; 14. Insert plate; 15. Insertion interface; 2. Conveyor belt; 3. Drive assembly; 31. Adjusting seat; 32. Spring clamp; 33. Air injection pipe; 34. Friction wheel; 4. Electric heating assembly; 41. Mounting plate; 42. Electric heating tube. Detailed Implementation

[0014] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0016] Combination Figure 1-4 As shown, a PET preform heating equalization device includes: The box body 1 is configured as a cylindrical structure, with an inlet 11 and an outlet 12 on its side wall, and an arc-shaped channel is opened inside. The conveyor belt 2 is a conveying structure for bottle preforms. It is made of high-temperature resistant material (e.g., a steel conveyor belt 2) and extends along the inlet 11 into the inside of the box 1, and finally extends along the outlet 12 to the outside to form continuous conveying. The drive component 3 is located at the bottom of the conveyor belt 2 and is used to drive the preforms fixed on the conveyor belt 2 to rotate, thereby improving the uniformity of the preform surface during the heating process. The electric heating component 4 is located on the side wall of the arc-shaped channel inside the housing 1, and is used to heat each area of ​​the preform accordingly.

[0017] Specifically, in this embodiment, the drive assembly 3 includes a mounting groove disposed on the conveyor belt 2, and an adjusting seat 31 is movably mounted in the mounting groove via a ball bearing. The top of the adjusting seat 31 is provided with a spring collet 32, which, as... Figure 3 As shown, the upper half of the chuck extends outside the adjusting seat 31, and its chuck should unfold outward, increasing the size of the hole at its center. A compression spring is provided at the bottom of the chuck. The compression spring pulls the chuck downward, and the inner wall of the hole at the center of the adjusting seat 31 forces the chuck to retract towards the center. The bottom end of the preform is inserted into the hole at the top of the chuck. Therefore, when the chuck retracts inward, it locks and fixes the preform. This structure can be used to fix preforms of various sizes, and it is simple in structure and very convenient to use.

[0018] Alternatively, a groove adapted to the bottom end of the preform of a fixed model can be provided at the center of the top surface of the adjusting seat 31 to allow for a limiting insertion and auxiliary fixation.

[0019] Furthermore, a friction wheel 34 is provided at the bottom of the adjusting seat 31. Multiple friction wheels 34 are interconnected and driven by each other (any of the following transmission structures can be used: gear and rack, belt drive, chain and sprocket, etc.). One of the friction wheels 34 is also equipped with a servo motor. The servo motor is connected to the corresponding gear on the friction wheel 34 through gear meshing, ensuring that all preforms can be driven to rotate by one motor. Compared with the "stationary translation" mode of the preforms in the existing device, the rotation can make the side wall of the preform contact the heat source 360° without dead angles, avoiding the positional difference of "overheating on the side closer to the heating tube and underheating on the side farther away".

[0020] An air injection pipe 33 is vertically installed at the center of the adjusting seat 31. The top and bottom ends of the air injection pipe 33 extend to the top and bottom surfaces of the adjusting seat 31, respectively, and are arranged concentrically with the preform. The air injection pipe 33 is mainly used for subsequent blow molding. When the preform enters the corresponding mold, the bottom is connected to the external air pipe to blow air into the preform, so that it can be quickly formed.

[0021] Meanwhile, the electric heating components 4 on the inner wall of the box 1 are arranged in a ring around the conveyor belt 2 and maintain a reasonable gap with the side wall of the preform to form a "ring heat source field". With the rotation of the preform, the heat can be evenly applied to the entire preform. At the same time, it avoids the problem of "local heat concentration in the fixed heating tube" and fundamentally solves the contradiction of "overheating and deformation of the neck and insufficient heating of the bottom", laying the foundation for the uniformity of wall thickness in blow molding.

[0022] In actual production, the preform is not a uniform cylinder. Instead, depending on the design of the finished bottle (such as a beverage bottle or an oil bottle), there are regional differences in thickness and shape. Different parts have completely different heat requirements. If overall heating is used, the thick area will be "underheated" (insufficiently softened), while the thin area will be "overheated" (material degradation).

[0023] Based on this, the electric heating component 4 in this embodiment includes several mounting plates 41 spaced apart on the inner sidewall of the arc-shaped channel. Each mounting plate 41 is vertically provided with multiple electric heating tubes 42, which are respectively arranged corresponding to the neck, upper, lower and bottom positions of the preform. At the same time, infrared thermometers are equipped at the corresponding height positions of the neck, upper, lower and bottom of the preform, and are set into multiple groups to directly obtain the actual temperature of each key part, rather than indirectly inferring from the ambient temperature inside the chamber. The temperature measurement accuracy is improved to ±1℃, avoiding the problems of "overheating leading to raw material degradation and underheating leading to incomplete molding".

[0024] Based on the above testing information, staff can also adjust the temperature of different parts individually (such as setting a higher temperature for the thick-walled area at the bottom to ensure sufficient softening, and setting a lower temperature for the narrow-diameter area at the neck to prevent melting and adhesion), perfectly adapting to the heat conduction needs of each part and solving the defect of the existing device that "uniform heating cannot take into account different parts".

[0025] Based on this structure, the electric heating tubes 42 corresponding to different areas of the preform should be arranged so that the temperature of the electric heating tubes 42 increases from low to high during the conveying process from the inlet 11 to the outlet 12, forming a "gradual heating process". This avoids surface degradation or internal stress concentration caused by sudden heating of the preform, further improving heating stability and reducing the molding defect rate.

[0026] Inside the housing 1, on the side away from the arc-shaped channel, a circulating air duct 13 is also provided, and an insertion interface 15 is provided on the top of the housing 1. At the same time, an external exhaust fan, together with the insertion plate 14, is directly slid into the insertion interface 15, and the fan is located inside the circulating air duct 13. This drives the air inside the housing to circulate between the air duct and the heating area, avoiding local heat accumulation near the heating tube, and reducing heat loss from the gaps in the housing 1. Compared with the existing non-circulation device, energy consumption can be reduced by 15%-20%, which meets the "low energy consumption" production requirements.

[0027] Furthermore, the circulating airflow can balance the temperature in different areas of the chamber, reduce the temperature gradient, further assist the preforms to be heated evenly, and at the same time avoid the increase in workshop ambient temperature due to heat loss, thus improving the comfort of operation.

[0028] The surface of the housing 1 is also embedded with a controller, which is preferably a Siemens S7-1200 series CPU 1214CDC / DC / DC (model: 6ES7214-1AG40-0XB0) and is equipped with a Bluetooth extension module CM 1243-8 (model: 6ES7243-8XD32-0XB0) to remotely control the drive source of the servo motor and conveyor belt 2. In addition, it is electrically connected to the infrared thermometer and the electric heating component 4 through wires.

[0029] In the above structure, the controller is based on "real-time temperature measurement - dynamic analysis - precise control" and is divided into three major modules to achieve fully automated control of the entire process. The specific logic is as follows: Temperature acquisition and preprocessing module: 1. Data Acquisition: Four infrared thermometers (corresponding to the neck, upper, lower, and bottom of the preform, respectively; recommended model: Omron E8CC-R2AH) collect the temperature of each part in real time and transmit it to the EM1234 module of the controller via a 4-20mA analog signal. 2. Signal processing: The controller filters the acquired analog signals (using a moving average algorithm) to eliminate instantaneous fluctuations caused by electromagnetic interference in the workshop, ensuring the accuracy of temperature data (error ≤ ±0.5℃). 3. Parameter storage: The built-in storage unit has a preset “part-target temperature” reference table for three common bottle preforms (such as 500mL beverage bottles, 1L cooking oil bottles, and 200mL daily chemical bottles) (e.g., target temperature of 85℃ for the neck of a 500mL bottle preform and target temperature of 110℃ for the bottom). Users can manually modify or save new parameters via a touch screen (such as Weintek TK6071IP).

[0030] Electric heating component 4 control module: 1. Temperature difference comparison: The controller calculates the difference between the actual temperature of each part and the preset target temperature (e.g., actual temperature at the bottom is 102℃ vs. target temperature of 110℃, temperature difference is -8℃). 2. PID Control Output: The PID algorithm is independently activated for different temperature differences at different locations. If the temperature difference is positive (actual measurement > target, such as neck 90℃ > 85℃): the controller reduces the output power of the corresponding electric heating tube 42 (by adjusting the opening of the solid-state relay through an analog output 0-10V signal); If the temperature difference is negative (actual temperature < target, such as bottom 102℃ < 110℃): increase the output power of the corresponding electric heating element 42; 3. Gradient heating protection: According to the requirement of "temperature increase from feed inlet 11 to discharge outlet 12", the controller presets the temperature gradient of 3 heating zones (feeding zone, middle zone, discharge zone) (e.g., feed zone 80℃, middle zone 95℃, discharge zone 110℃), and monitors the temperature of each zone in real time to avoid temperature difference between zones exceeding 5℃.

[0031] Servo motor and conveyor belt 2 drive linkage module: 1. Rotation speed reference setting: The controller presets initial parameters according to the preform specifications (e.g., 500mL preform rotation speed 15r / min, conveyor belt 2 speed 0.5m / s); 2. Dynamic adjustment logic: If the temperature difference in a certain part is consistently greater than 3℃ (e.g., bottom 100℃ < 110℃, lasting for 5 seconds): the controller sends a signal via Bluetooth module to reduce the speed of conveyor belt 2 by 10% (to 0.45m / s), extending the residence time of the preform in the heating area, while maintaining the rotation speed unchanged (to ensure uniform heating of the sidewalls). If the temperature difference between all parts is less than 1℃ (temperature stable): maintain the initial rotation speed and conveyor speed, or according to the production cycle requirements (such as capacity increase), increase the rotation speed (e.g., 15r / min → 18r / min) and the conveyor belt speed (0.5m / s → 0.6m / s) proportionally. 3. Synchronous start-stop control: When starting up, the controller first starts the electric heating component 4 to preheat (until the temperature of the feeding area reaches 80℃), and then starts the servo motor and conveyor belt 2 via Bluetooth; when shutting down, the conveyor belt 2 and servo motor are stopped first, and the heating power is cut off after the temperature of the electric heating tube 42 drops below 50℃ to avoid overheating of bottle preform residue or damage to the equipment.

[0032] In the above structure, a fault diagnosis function should also be provided. When the infrared thermometer is disconnected, the electric heating tube 42 is overheated, or the servo motor is overloaded, the power supply of the corresponding faulty component (such as the overheated electric heating tube 42) should be cut off immediately, and the conveyor belt 2 and the servo motor should be stopped. The fault type (such as "bottom thermometer disconnected") should be displayed on the touch screen, and the audible and visual alarm (24V buzzer + red LED) should be triggered so that subsequent maintenance can be carried out on the fault.

[0033] In the above-mentioned controller's linkage control structure, by "multi-component data interoperability and multi-parameter collaborative regulation," the limitation of "independent control of each component" in existing devices is overcome. It can synchronously link "heating power increase + conveyor belt deceleration," and the dual effect shortens the temperature compensation time (from the traditional 15s to within 5s), and avoids local overheating caused by single temperature increase. Furthermore, through PID algorithm and synchronous monitoring of multiple parts, the temperature difference of each part of the preform can be controlled within ±2℃ (compared to ±5℃ in traditional devices), significantly reducing defects such as "neck deformation and unsoftened bottom," and improving the product qualification rate by 8%-12%. Meanwhile, the structure can also flexibly adapt to the production of multiple specifications, reducing changeover time. For different specifications of preforms, the controller can store preset parameter groups (including temperature curves, rotation speed, and conveyor speed). When switching production types, you only need to select the corresponding parameter group through the touch screen. The controller will automatically and synchronously adjust the electric heating target temperature, servo rotation speed and conveyor belt speed. There is no need for manual debugging of each component. The changeover time is shortened from the traditional 30 minutes to within 5 minutes.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.

Claims

1. A PET preform heating equalization device, characterized in that, The box (1) is cylindrical and has an inlet (11) and an outlet (12) on its side wall. The inlet (11) and outlet (12) are connected to each other and a conveyor belt (2) is provided at the center. The two ends of the conveyor belt (2) extend to the outside of the inlet (11) and outlet (12) respectively and a number of preforms are arranged in sequence at the top. The bottom of the conveyor belt (2) is also provided with a drive assembly (3). The top of the drive assembly (3) extends to the surface of the conveyor belt (2) and drives the preforms to rotate. The inner wall of the box (1) is also provided with an electric heating assembly (4). The electric heating assembly (4) is arranged in a ring along the inner wall of the box (1) and has a gap with the side wall of the preforms.

2. The PET preform heating equalization device according to claim 1, characterized in that, The drive assembly (3) includes a mounting groove on the conveyor belt (2), and an adjustment seat (31) is movably mounted in the mounting groove via a ball bearing. The top of the adjustment seat (31) is provided with a spring collet (32), which is tilted upward and unfolded so that its inner wall is tightly fitted with the bottom surface of the preform. The bottom of the adjustment seat (31) is also provided with a friction wheel (34), and multiple friction wheels (34) are interconnected and driven by each other. One of the friction wheels (34) is also equipped with a servo motor.

3. The PET preform heating equalization device according to claim 2, characterized in that, A gas injection pipe (33) is also vertically installed at the center of the adjustment seat (31). The top and bottom ends of the gas injection pipe (33) extend to the top and bottom surfaces of the adjustment seat (31) respectively and are arranged concentrically with the preform.

4. The PET preform heating equalization device according to claim 3, characterized in that, The electric heating assembly (4) includes an arc-shaped channel disposed inside the housing (1) and connecting the inlet (11) and the outlet (12) to each other. Several mounting plates (41) are arranged sequentially at intervals on the side wall of the arc-shaped channel. Each mounting plate (41) is vertically provided with multiple electric heating tubes (42). The multiple electric heating tubes (42) are respectively arranged corresponding to the neck, upper, lower and bottom positions of the preform. The heating temperature of the electric heating tubes (42) on the mounting plate (41) increases sequentially from the inlet (11) to the outlet (12).

5. The PET preform heating equalization device according to claim 4, characterized in that, The box (1) is also provided with a circulating air duct (13) and arranged on the side away from the arc-shaped channel. The top of the box (1) is provided with an interface (15) and is connected to the circulating air duct (13). An insert plate (14) is vertically arranged inside the interface (15). An exhaust fan is fixedly installed on the insert plate (14). When the insert plate (14) is inserted into the interface (15), the exhaust fan is located inside the circulating air duct (13).

6. The PET preform heating equalization device according to claim 5, characterized in that, Multiple infrared thermometers are arranged on the inner wall of the arc-shaped channel, and these infrared thermometers are respectively arranged close to the neck, upper part, lower part and bottom of the preform.

7. The PET preform heating equalization device according to claim 6, characterized in that, The surface of the housing (1) is also provided with a controller, which is electrically connected to the infrared thermometer and the electric heating component (4) via wires, and the controller is remotely connected to the drive source of the servo motor and the conveyor belt (2) via a Bluetooth module.

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