Gradient temperature zone curing oven for resistor insulation coating

Abstract

This utility model belongs to the technical field of resistor production equipment, and in particular to a gradient temperature zone curing oven for resistor insulation coatings. It includes a conveyor chain, curing chambers, a CNC control box, a heating mechanism, thermocouples, and a door opening / closing mechanism. Multiple curing chambers are connected in series and fixed to the top of the conveyor chain, and each curing chamber has an inlet / outlet adapted to the conveyor chain. The heating mechanism is fixed to the top of the curing chamber and is used to blow hot air into the chamber. An air outlet is provided at the bottom of the outer side of the curing chamber. Multiple curing chambers with independent temperature zones can accommodate the curing requirements of various coatings such as epoxy and silicone, without requiring equipment replacement and reducing production costs. The independent design ensures low temperature interference between adjacent curing chambers, effectively reducing temperature fluctuations, preventing coating bubbles and cracking, and improving yield. The number of curing chambers can be customized to meet actual production needs and the curing requirements of insulation coatings with different compositions.

Description

Technical Field

[0001] This utility model belongs to the technical field of resistor production equipment, specifically relating to a gradient temperature zone curing oven for resistor insulation coating. Background Technology

[0002] In resistor production, the insulating coating needs to be cured at high temperature to achieve insulation performance and adhesion. The curing quality is highly dependent on temperature control. Insulating coatings of different materials need to be matched with specific "gradient curing curves". For example, epoxy coatings usually require a step temperature increase of 80℃→100℃→120℃, while silicone coatings require a gradient environment of 150℃→180℃→200℃.

[0003] Existing curing ovens mostly adopt a single temperature zone or fixed segmented temperature zone design, which has two major problems: First, the temperature zone cannot be flexibly adjusted, making it impossible to adapt to the curing curve requirements of different materials (such as epoxy and silicone) insulating coatings; second, the temperature fluctuation at the junction of temperature zones is large, resulting in uneven curing of the coating, which is prone to bubbles and cracks, affecting the quality of the finished resistor.

[0004] To address the aforementioned problems, this utility model proposes a gradient temperature zone curing oven for resistor insulation coatings. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a gradient temperature zone curing oven for resistor insulation coating, which features convenient use, high processing precision, and flexible adjustment.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a gradient temperature zone curing oven for resistor insulation coating, comprising a conveyor chain for conveying resistors to be cured, multiple curing chambers with independent temperature zones, a CNC box, a heating mechanism, a thermocouple, and a door opening and closing mechanism;

[0007] Multiple curing boxes are connected in series and fixed to the top of the conveyor chain by bolts, and the curing boxes are provided with inlet and outlet ports adapted to the conveyor chain;

[0008] The heating mechanism is fixed to the top of the curing chamber and is used to blow hot air into the curing chamber. An air outlet is provided at the bottom of the outer side of the curing chamber.

[0009] The thermocouple is fixed to the curing chamber and is used to monitor the temperature inside the curing chamber.

[0010] The opening and closing mechanism is provided corresponding to the inlet and outlet, and is used to open or close the inlet and outlet.

[0011] The CNC box is fixed on the curing box and is electrically connected to the conveyor chain, the heating mechanism and the thermocouple respectively.

[0012] As a preferred embodiment of this utility model, the number of curing chambers is at least three, the temperature range of each curing chamber is 50℃-300℃, and the temperature difference between adjacent curing chambers is 10℃-100℃.

[0013] As a preferred technical solution of this utility model, the heating mechanism includes a hot air blower;

[0014] The top of the curing chamber has a hole, the hot air blower is fixed to the top of the curing chamber, and the air outlet of the hot air blower passes through the hole and extends into the curing chamber.

[0015] As a preferred embodiment of this utility model, the heating mechanism further includes an air inlet duct and a porous filter plate;

[0016] The air inlet duct is fixed to the top of the curing box, and the hot air blower is located inside the air inlet duct;

[0017] The porous filter plate is fixed to the top of the air inlet duct by a flange.

[0018] As a preferred technical solution of this utility model, the door opening and closing mechanism includes a sealing plate and an electric push rod;

[0019] The sealing plate is located inside the curing chamber and corresponds to the inlet and outlet ports;

[0020] The electric push rod is fixed to the top of the curing box, and the piston rod of the electric push rod is fixedly connected to the sealing plate. The electric push rod is electrically connected to the CNC box.

[0021] As a preferred embodiment of this utility model, the door opening and closing mechanism further includes a silicone sealing strip;

[0022] The silicone sealing strip is bonded and fixed to the surface of the sealing plate and adheres to the inner wall of the curing chamber.

[0023] As a preferred embodiment of this utility model, the door opening and closing mechanism further includes a C-shaped guide rail and a guide slider;

[0024] The two C-shaped guide rails are symmetrically fixed to the inner wall of the curing box, and guide grooves are provided on the opposite surfaces of the two C-shaped guide rails.

[0025] The sealing plate is located between the two C-shaped guide rails, and the guide slider is fixed to the end of the sealing plate and is adapted to the guide groove.

[0026] As a preferred embodiment of this invention, there is a gap of 10mm between adjacent curing chambers.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] 1. With multiple curing chambers having independent temperature zones, it can adapt to the curing needs of various coatings such as epoxy and silicone, without the need to change equipment, thus reducing production costs;

[0029] 2. Independent design ensures low temperature interference between adjacent curing chambers, effectively reducing temperature fluctuations, preventing coating bubbles and cracks, and improving yield;

[0030] 3. The number of curing chambers can be customized to meet actual production needs and adapt to the curing requirements of insulating coatings with different compositions.

[0031] Other additional advantages and beneficial effects of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this invention. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 This is a schematic diagram of the cross-sectional structure of the curing box in this utility model;

[0035] Figure 3 This is an isometric structural diagram of the door opening and closing mechanism in this utility model;

[0036] Figure 4 This utility model Figure 2 Enlarged structural diagram at point A in the diagram;

[0037] Figure 5 This utility model Figure 3 A magnified structural diagram at point B in the diagram.

[0038] In the diagram: 1. Conveyor chain; 2. Curing box; 21. Inlet / outlet; 22. Air outlet; 3. CNC box; 4. Heating mechanism; 41. Hot air blower; 42. Air inlet duct; 43. Porous filter plate; 5. Thermocouple; 6. Door opening / closing mechanism; 61. Sealing plate; 62. Electric push rod; 63. Silicone sealing strip; 64. C-shaped guide rail; 641. Guide groove; 65. Guide slider. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] Please see Figures 1-5 The present invention provides the following technical solution: a gradient temperature zone curing oven for resistor insulation coating, including a conveyor chain 1 for conveying resistors to be cured, multiple curing boxes 2 with independent temperature zones, a CNC box 3, a heating mechanism 4, a thermocouple 5, and a door opening and closing mechanism 6.

[0041] Furthermore, by Figure 1 and Figure 2 As shown, in this embodiment, multiple curing boxes 2 are connected in series and fixed to the top of the conveyor chain 1 by bolts, and the curing box 2 is provided with an inlet / outlet 21 adapted to the conveyor chain 1; the heating mechanism 4 is fixed to the top of the curing box 2 and is used to blow hot air into the curing box 2, and an air outlet 22 is opened at the bottom of the outer side of the curing box 2; the thermocouple 5 is fixed to the curing box 2 and is used to monitor the internal temperature of the curing box 2; the door opening / closing mechanism 6 is set corresponding to the inlet / outlet 21 and is used to open or close the inlet / outlet 21; the CNC box 3 is fixed to the curing box 2 and is electrically connected to the conveyor chain 1, the heating mechanism 4 and the thermocouple 5 respectively. After adopting the above scheme, the number of curing boxes 2 is at least three when in use. This utility model has a total of five independent curing boxes 2, namely a preheating zone, a heating transition zone, a main curing zone, a cooling zone and a cooling transition zone. The temperature range of each curing box 2 is 50℃-300℃, and the temperature difference between adjacent curing boxes 2 is 10℃-100℃.

[0042] After starting the equipment, the operator inputs the curing process parameters through the CNC box 3, including the target temperature of each curing chamber 2 (preheating zone, heating transition zone, main curing zone, cooling zone, and cooling transition zone), the running speed of the conveyor chain 1 (adjusted according to the coating curing requirements to ensure that the resistor stays in each temperature zone for a sufficient curing time), and the linkage interval of the door opening and closing mechanism 6. After receiving the parameters, the CNC box 3 synchronously sends initial instructions to the conveyor chain 1, the heating mechanism 4, and the door opening and closing mechanism 6 to complete the equipment start-up preparation.

[0043] After receiving the instruction from the CNC box 3, the heating mechanism 4 corresponding to each curing box 2 starts and blows hot air into the box. At the same time, the thermocouple 5 fixed on each curing box 2 monitors the temperature inside the box in real time and feeds the data back to the CNC box 3. If the temperature of a curing box 2 is lower than the target value, the CNC box 3 controls the heating mechanism 4 to increase the hot air output; if the temperature is higher than the target value, the hot air output is reduced or heating is paused, forming a closed-loop temperature control. After all five curing boxes 2 have reached the preset temperature and stabilized (temperature difference fluctuation ≤ ±2℃), the CNC box 3 sends a "feedable" signal to trigger the start of the conveyor chain 1.

[0044] The resistor to be cured is conveyed by the conveyor chain 1 to the entrance of the first curing chamber 2 (preheating zone). At this time, the door opening mechanism 6 at the corresponding entrance automatically opens. After the resistor enters the chamber, the door opening mechanism 6 quickly closes (to prevent heat loss from the preheating zone). During the period when the resistor stays in the preheating zone, the insulating coating gradually heats up to the target temperature (usually set at 50℃-80℃), so as to achieve the initial evaporation of moisture in the coating and avoid bubbles in the coating due to sudden evaporation of moisture during subsequent high-temperature curing.

[0045] The preheated resistors are conveyed by the conveyor chain 1 into the second curing chamber 2 (heating transition zone). The inlet door opening mechanism 6 opens in conjunction with the outlet door opening mechanism 6 and closes simultaneously. The temperature in this zone is 10℃-50℃ higher than that in the preheating zone (e.g., 90℃-130℃). This gradient heating avoids internal stress in the resistors and coatings due to sudden temperature increases, preparing them for entry into the main curing zone. Thermocouple 5 continuously monitors the temperature to ensure a stable heating rate.

[0046] The resistor then enters the third curing chamber 2 (main curing zone) along the conveyor chain 1. The temperature zone is set to the highest value (150℃-300℃, adjusted according to the coating material). The resistor stays here for the longest time. The heating mechanism 4 continuously outputs hot air, which forms an airflow circulation through the air outlet 22 at the bottom of the curing chamber 2, so that the temperature inside the chamber is evenly distributed. The insulating coating completes the cross-linking reaction at high temperature, forming a stable insulating structure. Thermocouple 5 provides real-time feedback of temperature data, and CNC box 3 precisely controls the heating power to ensure consistent curing quality.

[0047] After the main curing is completed, the resistor enters the fourth curing chamber 2 (cooling zone). The temperature in this zone is 30℃-100℃ lower than that in the main curing zone (e.g., 80℃-150℃). The heating mechanism 4 stops outputting hot air, and some of the hot air is discharged through the air outlet 22. The temperature inside the chamber drops slowly to prevent the coating from cracking or the resistor body from being damaged due to sudden cooling. Thermocouple 5 monitors the cooling rate.

[0048] Finally, after the resistor enters the fifth curing chamber 2 (cooling transition zone), the temperature in the zone further drops to near room temperature (30℃-50℃). At this time, a small amount of room temperature air is introduced through the air outlet 22 to allow the resistor to be completely cooled and shaped, ensuring that the hardness and adhesion of the insulation coating meet the standards.

[0049] After cooling, the resistor is sent out from the cooling transition zone outlet along conveyor chain 1, completing the entire curing process.

[0050] Optionally, by Figure 1 and Figure 2 As shown in this embodiment, the heating mechanism 4 includes a hot air blower 41; the top of the curing box 2 has a hole, the hot air blower 41 is fixed to the top of the curing box 2, and the air outlet of the hot air blower 41 passes through the hole and extends into the curing box 2. With the above solution, when the CNC box 3 sends a start command to the heating mechanism 4 according to the process parameters, the hot air blower 41 starts to run. After receiving the command, the heating component inside the hot air blower 41 is first powered on to heat up, and at the same time the fan blades start. After the heating component reaches the preset temperature (matching the target temperature zone of the corresponding curing box 2), the hot air blower 41 enters a stable air supply state.

[0051] The outlet of the hot air blower 41 extends into the curing chamber 2 through the hole at the top of the chamber, directly supplying hot air into the curing chamber 2. The hot air diffuses downward from the top of the chamber, gradually filling the entire internal space of the curing chamber 2, and at the same time mixes with the air inside the chamber, pushing the air inside the chamber to form a downward airflow circulation. As the hot air continues to be input, the temperature inside the curing chamber 2 gradually rises until it reaches the target temperature set by the CNC box 3.

[0052] When thermocouple 5 detects that the temperature inside curing chamber 2 is lower than the target value, it will send a signal back to CNC box 3. CNC box 3 will then send an enhancement command to hot air blower 41 to increase the power of the heating components inside hot air blower 41 (increase the hot air temperature) or speed up the fan blade speed (increase the hot air volume), thereby increasing the hot air output and rapidly raising the temperature inside the chamber.

[0053] When thermocouple 5 detects that the temperature inside the chamber is higher than the target value, the CNC box 3 sends a weakening or pausing command to the hot air blower 41: if a slight cooling is required, the hot air blower 41 reduces the heating power or the air volume; if a significant cooling is required (such as in the cooling zone), the hot air blower 41 can pause the operation of the heating components and only use the fan blades to run at low speed to help the heat inside the chamber be discharged from the bottom air outlet 22, thereby achieving precise temperature control.

[0054] In the preheating zone and the heating transition zone, the hot air output by the hot air blower 41 is at a low temperature and with a moderate air volume to slowly increase the temperature of the resistor and coating and avoid local overheating. In the main curing zone, the hot air blower 41 needs to continuously output high temperature and sufficient hot air to ensure that the temperature inside the chamber is stable at the highest target value to meet the requirements of the coating crosslinking reaction. In the cooling zone and the cooling transition zone, the hot air blower 41 gradually reduces the heating power until it stops heating, and only uses low air volume to assist the airflow inside the chamber, in conjunction with the air outlet 22 to achieve stable cooling.

[0055] Preferably, by Figure 1 , Figure 2 and Figure 4 As shown in this embodiment, the heating mechanism 4 also includes an air inlet duct 42 and a porous filter plate 43; the air inlet duct 42 is fixed to the top of the curing box 2, and the hot air blower 41 is located inside the air inlet duct 42; the porous filter plate 43 is fixed to the top of the air inlet duct 42 by a flange. With the above solution, when air is introduced, the air inlet duct 42 can collect the outside air in a concentrated manner, avoiding the interference of messy airflow with the air intake efficiency of the hot air blower 41.

[0056] When the air is vented, the air inlet duct 42 can "directly transport" the hot air output by the hot air blower 41 to the hole at the top of the curing box 2, reducing the escape of hot air outside the curing box 2, improving the efficiency of the hot air blower 41 in transporting heat into the box, and reducing energy consumption.

[0057] The porous filter plate 43 is fixed to the top of the air inlet duct 42 by a flange. It can filter the outside air drawn in by the hot air blower 41, blocking dust, lint, particulate impurities and other contaminants in the air, preventing contaminants from entering the curing chamber 2 with the hot air. It can also prevent impurities from adhering to the surface of the insulation coating of the resistor, avoiding spots and defects in the coating. At the same time, it can prevent impurities from affecting the adhesion between the coating and the resistor body, ensuring the curing quality and electrical performance of the insulation coating.

[0058] Optionally, by Figures 1-3As shown, in this embodiment, the door opening and closing mechanism 6 includes a sealing plate 61, an electric push rod 62, and a silicone sealing strip 63. The sealing plate 61 is located inside the curing chamber 2 and corresponds to the inlet / outlet 21. The electric push rod 62 is fixed to the top of the curing chamber 2, and the piston rod of the electric push rod 62 is fixedly connected to the sealing plate 61. The electric push rod 62 is electrically connected to the CNC box 3. The silicone sealing strip 63 is bonded and fixed to the surface of the sealing plate 61 and adheres to the inner wall of the curing chamber 2. With the above scheme, when the conveyor chain 1 transports the resistor to be cured to the inlet / outlet 21 of the corresponding curing chamber 2, the conveyor chain 1 will send a "material in place" signal to the CNC box 3. Or when the resistor has completed the curing of the temperature zone and needs to enter the next temperature zone, the conveyor chain 1 will send a "material to be transferred out" signal. The CNC box 3 sends an "open door" or "close door" command to the door opening and closing mechanism 6 corresponding to the inlet / outlet 21 according to the preset curing process rhythm. After receiving the command, the electric push rod 62 enters the standby state.

[0059] If the CNC box 3 sends an "open door" command, the electric push rod 62 will start and drive the piston rod to retract axially. Since the piston rod of the electric push rod 62 is fixedly connected to the sealing plate 61, the sealing plate 61 will move synchronously with the piston rod until it is completely separated from the inlet / outlet 21, forming a channel for the resistor to pass through. During this process, the silicone sealing strip 63 adhered to the surface of the sealing plate 61 moves synchronously with the sealing plate 61.

[0060] Once the resistor has fully entered the curing chamber 2 (or has fully exited the conveyor chain 1), the conveyor chain 1 sends a "material passed" signal to the CNC box 3. The CNC box 3 then sends a "close door" command to the electric push rod 62. The electric push rod 62 starts, and the piston rod extends axially, pushing the sealing plate 61 to move towards the inlet / outlet 21 until the sealing plate 61 completely covers the inlet / outlet 21. At this time, the silicone sealing strip 63 on the surface of the sealing plate 61 deforms due to the pressure between the sealing plate 61 and the inner wall of the curing chamber 2, tightly filling the gap between the sealing plate 61 and the inner wall of the curing chamber 2, forming a flexible sealing structure. This prevents the high-temperature hot air in the curing chamber 2 from leaking from the inlet / outlet 21 (ensuring stable temperature in the temperature zone and reducing energy consumption) and prevents ambient air from entering the chamber and interfering with the curing environment.

[0061] Optionally, by Figures 1-3 , Figure 5As shown, in this embodiment, the door opening and closing mechanism 6 further includes a C-shaped guide rail 64 and a guide slider 65; two C-shaped guide rails 64 are symmetrically fixed to the inner wall of the curing chamber 2, and guide grooves 641 are provided on the opposite surfaces of the two C-shaped guide rails 64; the sealing plate 61 is located between the two C-shaped guide rails 64, and the guide slider 65 is fixed to the end of the sealing plate 61 and adapted to the guide groove 641. With the above solution, when the electric push rod 62 drives the sealing plate 61 to move during use, the guide slider 65 moves along the guide groove 641. The directional sliding of the chute 641 can strictly limit the movement trajectory of the sealing plate 61, allowing it to move only in a straight line along the length of the C-shaped guide rail 64. This prevents the sealing plate 61 from tilting left or right or shifting up or down due to slight swaying of the piston rod of the electric push rod 62 or slight deformation of the components caused by the high temperature inside the curing chamber 2. This ensures that the sealing plate 61 can accurately avoid the inlet / outlet 21 each time it is opened and can precisely align with the edge of the inlet / outlet 21 when it is closed, avoiding obstruction of resistor delivery or sealing failure due to positional deviation.

[0062] Preferably, by Figure 1 As shown in this embodiment, there is a 10mm gap between adjacent curing chambers 2. With the above solution, the gap can effectively block direct heat conduction between the chambers. Since each curing chamber 2 corresponds to a different temperature zone (e.g., preheating zone 50℃-80℃, main curing zone 150℃-300℃), the temperature difference can reach up to 250℃. If the chambers are in direct contact, the heat from the high-temperature chamber will be quickly transferred to the low-temperature chamber through the metal chamber, causing the temperature of the low-temperature chamber to rise and the temperature of the high-temperature chamber to drop, thus destroying the preset gradient temperature difference. The air insulation layer formed by the gap can significantly reduce the heat conduction efficiency, allowing each curing chamber 2 to independently maintain the target temperature. This ensures that the resistor is cured step by step in the gradient temperature zone according to the process requirements, avoiding the degradation of coating curing quality due to heat transfer between temperature zones (e.g., insufficient preheating causing bubbles, or excessive cooling causing cracking).

[0063] It should be noted that the conveyor chain 1, CNC box 3, hot air blower 41, thermocouple 5, and electric push rod 62 are all commercially available conventional equipment with built-in power switches. Those skilled in the art can make conventional selections according to their needs. Their working principles are common knowledge known to those skilled in the art and have been fully disclosed in the prior art, so they will not be elaborated on further in this article.

[0064] The circuit connection involved in this utility model is a common method used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. It belongs to the widely used prior art.

[0065] Components not described in detail in this article are existing technologies.

[0066] The working principle and usage process of this utility model: The curing oven of this utility model adopts a tunnel curing oven equipment, which has five independent curing chambers 2, corresponding to the preheating zone, the heating transition zone, the main curing zone, the cooling zone and the cooling transition zone respectively. The temperature range of each curing chamber 2 is 50℃-300℃, and the temperature difference between adjacent curing chambers 2 is 10℃-100℃.

[0067] After starting the equipment, the operator inputs the curing process parameters through the CNC box 3, including the target temperature of each curing chamber 2 (preheating zone, heating transition zone, main curing zone, cooling zone, and cooling transition zone), the running speed of the conveyor chain 1 (adjusted according to the coating curing requirements to ensure that the resistor stays in each temperature zone for a sufficient curing time), and the linkage interval of the door opening and closing mechanism 6. After receiving the parameters, the CNC box 3 synchronously sends initial instructions to the conveyor chain 1, the heating mechanism 4, and the door opening and closing mechanism 6 to complete the equipment start-up preparation.

[0068] After receiving the instruction from the CNC box 3, the heating mechanism 4 starts the hot air blower 41 corresponding to each curing box 2, blowing hot air into the box. At the same time, the thermocouple 5 fixed on each curing box 2 monitors the temperature inside the box in real time and feeds the data back to the CNC box 3. If the temperature of a curing box 2 is lower than the target value, the CNC box 3 controls the hot air blower 41 to increase the hot air output; if the temperature is higher than the target value, the hot air output is reduced or heating is paused, forming a closed-loop temperature control. After all five curing boxes 2 have reached the preset temperature and stabilized (temperature difference fluctuation ≤ ±2℃), the CNC box 3 sends a "feedable" signal, triggering the start of the conveyor chain 1.

[0069] The resistor to be cured is conveyed by the conveyor chain 1 to the entrance of the first curing box 2 (preheating zone). At this time, the door opening mechanism 6 at the corresponding entrance automatically opens. After the resistor enters the box, the door opening mechanism 6 quickly closes (to prevent heat loss from the preheating zone). During the period when the resistor stays in the preheating zone, the insulating coating gradually heats up to the target temperature (usually set at 50℃-80℃) to achieve initial evaporation of the coating moisture and avoid bubbles in the coating due to rapid evaporation of moisture during subsequent high-temperature curing.

[0070] The preheated resistors are conveyed by the conveyor chain 1 into the second curing chamber 2 (heating transition zone). The inlet door opening mechanism 6 opens in conjunction with the outlet door opening mechanism 6 and closes simultaneously. The temperature in this zone is 10℃-50℃ higher than that in the preheating zone (e.g., 90℃-130℃). Gradual heating is used to prevent internal stress in the resistors and coatings due to sudden temperature increases, thus preparing them for entry into the main curing zone. Thermocouple 5 continuously monitors the temperature to ensure a stable heating rate.

[0071] The resistor then enters the third curing chamber 2 (main curing zone) along the conveyor chain 1. The temperature zone is set to the highest value (150℃-300℃, adjusted according to the coating material). The resistor stays here for the longest time. The hot air blower 41 continuously outputs hot air, forming an airflow circulation through the air outlet 22 at the bottom of the curing chamber 2, so that the temperature inside the chamber is evenly distributed. The insulating coating completes the cross-linking reaction at high temperature, forming a stable insulating structure. Thermocouple 5 provides real-time feedback of temperature data, and CNC box 3 precisely controls the heating power to ensure consistent curing quality.

[0072] After the main curing is completed, the resistor enters the fourth curing chamber 2 (cooling zone). The temperature in this zone is 30℃-100℃ lower than that in the main curing zone (e.g., 80℃-150℃). The hot air blower 41 stops outputting hot air, and some hot air is discharged through the air outlet 22. The temperature inside the chamber drops slowly to prevent the coating from cracking or the resistor body from being damaged due to sudden cooling. Thermocouple 5 monitors the cooling rate.

[0073] Finally, after the resistor enters the fifth curing chamber 2 (cooling transition zone), the temperature of the zone further drops to near room temperature (30℃-50℃). At this time, a small amount of room temperature air is introduced through the air outlet 22 or the operation of the heating components is paused. Only the fan blades run at low speed, and the heat in the auxiliary chamber is discharged from the bottom air outlet 22, so that the resistor is completely cooled and shaped, ensuring that the hardness and adhesion of the insulation coating meet the standards.

[0074] After cooling, the resistor is sent out from the cooling transition zone outlet along conveyor chain 1, completing the entire curing process.

[0075] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gradient temperature zone curing oven for resistor insulation coating, characterized in that: It includes a conveyor chain (1) for transporting resistors to be cured, multiple curing chambers (2) with independent temperature zones, a CNC box (3), a heating mechanism (4), a thermocouple (5), and a door opening and closing mechanism (6). Multiple curing boxes (2) are connected in series and fixed to the top of the conveyor chain (1) by bolts, and the curing boxes (2) are provided with inlet and outlet ports (21) adapted to the conveyor chain (1). The heating mechanism (4) is fixed to the top of the curing box (2) and is used to blow hot air into the curing box (2). An air outlet (22) is provided at the bottom of the outer side of the curing box (2). The thermocouple (5) is fixed on the curing chamber (2) and is used to monitor the internal temperature of the curing chamber (2); The door opening and closing mechanism (6) is provided corresponding to the inlet and outlet (21) and is used to open or close the inlet and outlet (21). The CNC box (3) is fixed on the curing box (2) and is electrically connected to the conveyor chain (1), the heating mechanism (4) and the thermocouple (5) respectively.

2. The resistor insulation coating gradient temperature zone curing oven according to claim 1, characterized in that: The number of curing chambers (2) is at least three, the temperature range of each curing chamber (2) is 50℃-300℃, and the temperature difference between adjacent curing chambers (2) is 10℃-100℃.

3. The resistor insulation coating gradient temperature zone curing oven according to claim 1, characterized in that: The heating mechanism (4) includes a hot air blower (41); The top of the curing box (2) has a hole, the hot air blower (41) is fixed to the top of the curing box (2), and the air outlet of the hot air blower (41) passes through the hole and extends into the curing box (2).

4. The resistor insulation coating gradient temperature zone curing oven according to claim 3, characterized in that: The heating mechanism (4) also includes an air inlet duct (42) and a porous filter plate (43); The air inlet duct (42) is fixed to the top of the curing box (2), and the hot air blower (41) is located inside the air inlet duct (42); The porous filter plate (43) is fixed to the top of the air inlet duct (42) by a flange.

5. The gradient temperature zone curing oven for resistor insulation coating according to claim 1, characterized in that: The door opening and closing mechanism (6) includes a sealing plate (61) and an electric push rod (62). The sealing plate (61) is located inside the curing chamber (2) and corresponds to the inlet / outlet (21); The electric push rod (62) is fixed to the top of the curing box (2), and the piston rod of the electric push rod (62) is fixedly connected to the sealing plate (61). The electric push rod (62) is electrically connected to the CNC box (3).

6. The resistor insulation coating gradient temperature zone curing oven according to claim 5, characterized in that: The door opening and closing mechanism (6) also includes a silicone sealing strip (63); The silicone sealing strip (63) is bonded and fixed to the surface of the sealing plate (61) and adheres to the inner wall of the curing box (2).

7. The resistor insulation coating gradient temperature zone curing oven according to claim 5, characterized in that: The door opening and closing mechanism (6) also includes a C-shaped guide rail (64) and a guide slider (65). Two C-shaped guide rails (64) are symmetrically fixed to the inner wall of the curing box (2), and guide grooves (641) are provided on the opposite surfaces of the two C-shaped guide rails (64). The sealing plate (61) is located between the two C-shaped guide rails (64), and the guide slider (65) is fixed to the end of the sealing plate (61) and is adapted to the guide groove (641).

8. The gradient temperature zone curing oven for resistor insulation coating according to claim 1, characterized in that: There is a gap of 10 mm between adjacent curing boxes (2).

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