A hot air circulation tunnel oven suitable for mixed insulators

Abstract

This utility model belongs to the technical field of drying equipment, specifically relating to a hot air circulating tunnel oven suitable for hybrid insulators. It includes a heating box with a conveyor frame running through it. Chains are installed on both sides of the conveyor frame, and transmission plates are detachably mounted on the chains. A feeding tray is placed on the conveyor plate. A hot air circulation inlet duct runs through one end of the heating box, and the other end of the duct is connected to the inlet of a circulating pump. The outlet of the circulating pump is connected to the inlet of a fan, and the outlet of the fan is connected to the inlet of a duct heater. The outlet of the duct heater is connected to a hot air circulation supply duct, the other end of which runs through the other end of the heating box. Through holes are distributed on the wall of the heating box facing the air supply plate, and all air supply plates are connected to the hot air circulation supply duct. A distributed temperature sensor group, a human-machine interface device, a circulating pump, a fan, and a control box are electrically connected. This utility model features high temperature uniformity and low energy consumption.

Description

Technical Field

[0001] This utility model belongs to the technical field of drying equipment, specifically relating to a hot air circulating tunnel oven suitable for hybrid insulators. Background Technology

[0002] In power systems, new types of insulators are used to support and fix live conductors while ensuring electrical insulation between the conductors and grounded parts. Due to their superior electrical performance and mechanical strength, new hybrid insulators are gradually replacing traditional ceramic or glass insulators, becoming a trend in the industry. In the production process of new hybrid insulators, the efficient drying of surface treatment reagents is a crucial step, directly affecting the quality of the finished insulators and production efficiency.

[0003] Although existing drying equipment can achieve basic hot air circulation, it is inadequate in terms of temperature uniformity and energy efficiency, specifically in the following aspects: (1) Uneven temperature: The hot air distribution inside the traditional oven is uneven, which easily forms hot or cold spots in certain areas, resulting in poor drying effect of the surface treatment reagent for new insulators and affecting the quality of the finished product; (2) Low energy efficiency: The existing hot air circulation system has high energy consumption and low thermal efficiency, which increases production costs; (3) Inconvenient operation: The control system of traditional drying equipment has a single function and cannot achieve intelligent management and real-time monitoring, which affects production efficiency and ease of operation; (4) Poor adaptability: The design of the conveying system is not flexible enough, and it is difficult to place and transport new insulators of different sizes in the oven, which can easily cause product damage or displacement.

[0004] In the patent with announcement number "CN 209802053 U" and title "A Walking Multi-Station Tunnel Oven", a chain conveyor is installed through the furnace body, and furnace doors are provided on both sides of the furnace body. The product is placed on the conveyor chain and baked by electric heating elements or direct-fired burners below the chain conveyor. However, this method results in uneven heating of different parts of the product. Some parts are heated too high and some parts are heated too low, resulting in a low yield and energy waste. Even reducing the length of the furnace body cannot avoid the above situation. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a hot air circulating tunnel oven suitable for hybrid insulators. By optimizing the hot air circulation system, control system, conveying system, and frame structure, it significantly improves the drying effect of the surface treatment reagent for novel hybrid insulators, enhances the temperature uniformity inside the oven, reduces energy consumption, and improves production efficiency and finished product quality.

[0006] The objective of this utility model is achieved through the following technical solution. A hot air circulating tunnel oven suitable for hybrid insulators, according to this utility model, includes a heating box with openings at both ends. A conveyor frame passes through the heating box, with both ends extending from the corresponding openings of the heating box. Chains driven by conveyor motors are provided on both sides of the conveyor frame, and transmission plates are detachably mounted on the chains on both sides. A feeding tray is placed on the conveyor plate. A hot air circulating inlet pipe passes through one end of the heating box, with one end extending into the inner cavity of the heating box and the other end connected to the inlet of a circulating pump. The outlet of the circulating pump is connected to the inlet of a fan via a fan connecting pipe. The fan outlet is connected to the inlet of the duct heater, and the outlet of the duct heater is connected to the hot air circulation duct. The other end of the hot air circulation duct passes through the other end of the heating box. Air supply plates are provided on the upper, left, and right sides of the inner cavity of the heating box. The air supply plates have a hollow structure and through holes distributed on the wall of the inner cavity of the heating box. All air supply plates are connected to the hot air circulation duct. A distributed temperature sensor group is provided inside the heating box. A human-machine interaction device and a control box are provided on the outside of the heating box. The distributed temperature sensor group, the human-machine interaction device, the circulation pump, the fan and the control box are electrically connected.

[0007] Furthermore, the inlet of the air duct heater is connected to the fan via interface flange I, and the outlet is connected to the hot air circulation duct via interface flange II.

[0008] Furthermore, the inner cavity of the air duct heater 1 forms a heater air duct, and the outer wall of the air duct heater is provided with a junction box. The junction box is provided with a cable inlet. The junction box and the outer wall of the air duct heater are connected through a heat insulation interface flange. The electric heating tube in the air duct is electrically connected to the junction box.

[0009] Furthermore, a temperature warning light electrically connected to the control box is installed on the outside of the heating box.

[0010] Furthermore, both ends of the conveyor frame are provided with sprockets for opening the corresponding chains, and two sprockets at one end of the conveyor frame are connected by a synchronous shaft, and the conveyor motor is connected to the synchronous shaft for transmission.

[0011] Furthermore, each end of the conveyor frame is provided with a sprocket for opening the corresponding chain. The conveyor motor is directly connected to the sprocket on one side. Sprockets are provided at both ends of the synchronous shaft. The chain driven by the conveyor motor meshes with the sprocket at one end of the synchronous shaft, and the sprocket at the other end of the synchronous shaft meshes with the chain on the other side.

[0012] Furthermore, a support plate fixed to the conveyor frame is provided below the chain, allowing the chain to slide on the support plate.

[0013] Furthermore, a support frame is provided at the bottom of the heating box, and the control box is mounted on the support frame.

[0014] Furthermore, the inner wall of the heating box is provided with an insulation board.

[0015] Furthermore, heating chamber door panels and cylinders for driving the heating chamber door panels to open and close are provided at the openings at both ends of the heating chamber.

[0016] Compared with the prior art, the advantages of this utility model are: (1) High temperature uniformity: Through the optimized design of the thermal circulation system and the heat flow countercurrent technology, the hot air can be evenly distributed inside the oven, avoiding the problem of hot or cold spots in traditional ovens, improving temperature uniformity, thereby improving the drying quality of the new mixed insulator surface treatment reagent and achieving efficient drying.

[0017] (2) Low energy consumption: The optimized thermal circulation system and efficient hot air utilization significantly reduce energy consumption and save production costs.

[0018] (3) Intelligent management: The control system achieves precise monitoring and intelligent management of the oven's operating status through the coordinated action of temperature warning light 201, human-machine interaction device 203, control box 203 and distributed temperature sensor group 204, which improves the convenience and reliability of operation.

[0019] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the purpose, features and advantages of this utility model more obvious and easy to understand, the following preferred embodiments are provided in conjunction with the accompanying drawings for detailed description. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an embodiment of a hot air circulating tunnel oven suitable for hybrid insulators according to the present invention.

[0021] Figure 2 This is a schematic diagram of the installation of the conveying system in an embodiment of a hot air circulating tunnel oven suitable for hybrid insulators according to this utility model.

[0022] Figure 3 This is a schematic diagram of the structure and connection of the air duct heater in an embodiment of a hot air circulating tunnel oven suitable for hybrid insulators according to this utility model.

[0023] Figure 4 This is a schematic diagram of the thermal circulation system in an embodiment of a hot air circulating tunnel oven suitable for hybrid insulators according to this utility model.

[0024] Figure 5 This is a block diagram illustrating the working principle of a hot air circulating tunnel oven suitable for hybrid insulators according to an embodiment of this utility model.

[0025] Figure label: 101. Hot air circulation inlet duct; 102. Circulation pump; 103. Fan connecting pipe; 104. Fan; 105. Interface flange I; 106. Duct heater; 107. Interface flange II; 108. Hot air circulation supply duct; 109. Upper air supply plate; 110. Left air supply plate; 111. Right air supply plate; 1061. Heater duct; 1062. Cable inlet; 1063. Junction box; 1064. Insulation interface flange; 1065. Heating element; 201. Temperature warning light; 202. Human-machine interface device; 203. Control box; 204. Distributed temperature sensor group; 301. Synchronous shaft; 302. Conveyor frame; 303. Chain; 304. Conveyor motor; 305. Feed tray; 306. Conveyor plate; 401. Heating chamber outer shell; 402. Support frame; 403. Insulation board; 404. Heating chamber door panel; 45. Cylinder. Detailed Implementation

[0026] 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.

[0027] This utility model provides an embodiment of a hot air circulating tunnel oven suitable for hybrid insulators, such as... Figures 1 to 5 As shown, the oven includes a frame structure, a heat circulation system, a control system, and a conveying system.

[0028] The frame structure includes a heating chamber and a support frame 402. The heating chamber includes a heating chamber shell 401, an insulation plate 403, a heating chamber door panel 404, and a cylinder 405. The heating chamber shell 401 is generally rectangular and has an internal cavity. Openings are located on both ends of the heating chamber shell 401, forming a through tunnel within the cavity. The insulation plate 403 is located on the inner wall of the heating chamber shell 401 to insulate the cavity. The support frame 402 is located at the bottom of the heating chamber shell 401 to support it. A control box 203 is mounted on the support frame 402. The heating chamber door panel 404 and the cylinder 405 are located on the outside of the heating chamber shell 401. The heating chamber door panel 404 covers the openings on both ends of the heating chamber shell 401 to close it. The heating chamber door panel 404 slides vertically on the heating chamber shell 401. The output shaft of cylinder 405 is fixed to the heating chamber door panel 104. Cylinder 405 is fixed to the heating chamber outer shell 401. Cylinder 405 controls the up-and-down sliding of the heating chamber door panel 404, thereby opening and closing the opening on the heating chamber outer shell 401. The heating chamber door panel 104 cooperates with the insulation plate 403 to achieve good heat preservation performance. A temperature warning light 201 and a human-machine interface device 202 are also provided on the outside of the heating chamber outer shell 401.

[0029] The thermal circulation system includes a thermal circulation air inlet duct 101, a circulation pump 102, a fan connecting pipe 103, a fan 104, an interface flange I 105, a duct heater 106, an interface flange II 107, a thermal circulation air supply duct 108, an upper air supply plate 109, a left air supply plate 110, and a right air supply plate 111. The thermal circulation air inlet duct 101 passes through one end of the heating chamber shell 401 and extends into the inner cavity of the heating chamber through the insulation plate 403. The circulation pump 102, the fan 104, and the duct heater 106 are all located on the top of the heating chamber shell 401. The other end of the thermal circulation air inlet duct 101 is connected to the inlet of the circulation pump 102, which efficiently circulates the hot air in the thermal circulation system. The outlet of the circulation pump 102 is connected to the fan 104 through the fan connecting pipe 103. The fan 104 can draw in outside air. The other end of the fan connecting pipe 103 is connected to the inlet side wall of the fan 104. While drawing in outside air, the fan 104 also draws in hot air. The fan 104 can mix the hot air with the outside air to replenish the hot air that is leaked due to the transmission of the mixing insulator.

[0030] Interface flange I 105 connects the outlet of fan 104 and the inlet of air duct heater 106, and interface flange II 107 connects the outlet of air duct heater 106 and the hot air circulation duct 108. A through hole is provided at the other end of heating box shell 401 and insulation plate 403, so that the hot air circulation duct 108 can pass through the other end of heating box shell 401 and through insulation plate 403. The top wall of the insulation board 403 is provided with an upper air supply plate 109, the left wall with a left air supply plate 110, and the right wall with a right air supply plate 111. The upper air supply plate 109, the left air supply plate 110, and the right air supply plate 111 are all hollow structures. The walls of the three air supply plates facing the inner cavity of the heating box are all provided with through holes as hot air outlets. The hot air inlets on the three air supply plates are connected to the outlet of the hot air circulation duct 108. The hot air circulation duct 108 has three independent passages near the outlet. The three independent passages are connected to the hot air inlets of the three air supply plates respectively, so that hot air can enter the three air supply plates respectively, and then be blown evenly into the inner cavity through the through holes on the air supply plates, so that the air temperature in the inner cavity is uniform, and the hybrid insulator is heated evenly.

[0031] The hot air inside the heating chamber, under the action of the circulating pump 102, enters the fan connecting pipe 103 after passing through the hot air circulation inlet pipe 101 and the circulating pump 102. It is then mixed with the ambient temperature and humidity air outside by the fan 104 and enters the air duct heater 106. After being heated by the air duct heater 106, the hot air enters the upper air supply plate 109, the left air supply plate 110, and the right air supply plate 111 through the hot air circulation supply pipe 108, and finally enters the interior of the insulation plate 403, achieving a heat flow counter-current effect and uniformly heating the new insulator.

[0032] The inner cavity of the outer shell of the duct heater 106 forms a heater duct 1061, and both ends of the heater duct 1061 are connected to the fan 104 and the hot air circulation duct 108, respectively. A junction box 1063 is provided on the outer wall of the duct heater 106, and a cable inlet 1062 is provided on the junction box 1063 to provide power to several electric heating elements 1065 inside the heater duct 1061. The junction box 1063 is connected to the outer wall of the duct heater 106 through a heat-insulating flange 1064, which not only connects the outer shell of the duct heater 106 to the junction box 1063, allowing the electric heating elements 1065 inside the duct to be electrically connected to the junction box 1063, but also prevents the heat source from damaging the electrical components inside the junction box 1063.

[0033] The control system includes a temperature warning light 201, a human-machine interface device 202, a control box 203, and a distributed temperature sensor group 204. The distributed temperature sensor group 204, temperature warning light 201, and human-machine interface device 202 are all electrically connected to the control box 203, as are the circulating pump 102 and the fan 104. The distributed temperature sensor group 204 includes multiple temperature sensors distributed on the inner wall of the insulation plate 403, monitoring temperature changes inside the heating chamber and acquiring and feeding back temperature data in real time. The control box 203 of the control system 2 adaptively adjusts and precisely controls the speed of the circulating pump 102 and the fan 104 based on this temperature data to ensure that the temperature inside the heating chamber is maintained at the target temperature set by the human-machine interface device 202. The temperature warning light 201 is located above the heating chamber to observe whether the temperature meets the target temperature. When the temperature is outside the target temperature range, the temperature warning light 201 illuminates to alert the operator. The control system enables precise monitoring and intelligent management of the oven's operating status.

[0034] The conveying system 3 includes a synchronous shaft 301, a conveyor frame 302, a chain 303, a conveyor motor 304, a discharge tray 305, and a conveyor plate 306. The conveyor frame 302 passes through the heating chamber and extends from openings at both ends of the heating chamber's outer shell 401. The conveyor frame 302 is fixedly mounted on the heating chamber's outer shell 401. Chains 303 are provided on both sides of the conveyor frame 302, and sprockets are provided at both ends of the conveyor frame 302. The sprockets are located on the outside of the heating chamber's outer shell 401, and the chains 303 are spread apart by the sprockets. Two sprockets at one end of the conveyor frame 302 are fixedly connected by the synchronous shaft 301, allowing the two sprockets to rotate synchronously. The conveyor motor 304 is located on the conveyor frame 302 near the synchronous shaft 301, and the conveyor motor 304 is drive-connected to the synchronous shaft 301, for example, via chain drive. The conveyor motor 304 is located on the outside of the heating chamber's outer shell 401. The transmission motor 304 rotates, driving the synchronous shaft 301 to rotate, so that the chains 303 on both sides of the transmission frame 302 are synchronously driven.

[0035] Conveyor plates 306 are mounted on the chains 303 on both sides. The snap-fit ​​protrusions on the lower surface of the conveyor plates 306 engage with the gaps in the chain links, allowing the conveyor plates 306 to move with the chains 303 and facilitating quick removal. Due to the long span of the chains 303 and the presence of the conveyor plates 306, a support plate fixed to the conveyor frame 302 is installed below the chains 303 to ensure smooth transmission. This allows the chains 303 to slide on the support plate, guaranteeing stable transmission. Multiple conveyor plates 306 are distributed along the conveying direction of the chains 303, and the portion of the chains 303 and conveyor frame 302 extending out of the heating box housing 401 can accommodate at least one conveyor plate 306. A feeding tray 305 is placed on the conveyor plate 306, and a mixed insulator is placed on the feeding tray 305. The chain 303 rotates, driving the conveyor plate 306 from one end of the heating box to the other, thereby driving the feeding tray 305 and the mixed insulators on the feeding tray 305 from one end of the heating box to the other, so that the hot air in the heating box can fully dry the mixed insulators.

[0036] Figure 2 The shape of the feeding tray 305 and the mixed insulator on it is for illustrative purposes only. The height and diameter of the feeding tray 305 can be adjusted according to the size and shape of the mixed insulator to prevent it from contacting the conveyor plate 306 or other parts of the heating box after being placed on the feeding tray 305. This prevents the reagent on the surface of the mixed insulator from sticking at high temperatures. Matching the shape of the feeding tray 305 to the mixed insulator ensures that the feeding tray 305 can fully support the mixed insulator, preventing it from shaking or shifting and achieving stable transmission. Placing the mixed insulator together with the feeding tray 305 on the conveyor plate 306 allows for flexible placement.

[0037] One end of the conveyor system 3 is the starting point. A conveyor plate 306 is placed on the chain 303 at the starting point. A feeding tray 305 and a mixed insulator are placed on the conveyor plate 306. As the chain 303 moves, the conveyor plate 306, feeding tray 305, and mixed insulator are fed into the heating chamber for heating and drying. When the mixed insulator reaches the end point of the other end of the conveyor system 3 and is completely dried, the conveyor plate 306, feeding tray 305, and mixed insulator are removed. The feeding tray 305 and mixed insulator are then transported to the next process, and the conveyor plate 306 is sent back to the starting point of the conveyor system 3 for continued use. During the continuous operation of the conveyor system 3, the heating chamber door 404 is open to facilitate continuous operation, and the fan 104 can replenish the hot air lost from the openings at both ends of the heating chamber. When the conveyor system 3 is running intermittently, the heating chamber door 404 can be closed to reduce the loss of hot air.

[0038] In practical use, the working process of this utility model is as follows: Start the equipment: The operator starts the oven through the human-machine interface device 202, while the control system 2 initializes each component.

[0039] Preheating: The air duct heater 106 starts heating, and the fan 104 is started. The fan 104 sends ambient temperature and humidity air into the heater air duct 1061, which is heated to the required temperature by the electric heating tube 1065, and then sent into the inner cavity of the heating box through the hot air circulation duct 108 and the air supply plate.

[0040] Hot air circulation: The circulation pump 102 is started, and the circulation pump 102 draws the hot air inside the insulation plate 403 to the fan connection pipe 103 through the hot air circulation inlet pipe 101. The fan 104 then sends the mixed hot air into the air duct heater 106 for heating. The heated airflow is then introduced into the upper air supply plate 109, the left air supply plate 110 and the right air supply plate 111 through the hot air circulation outlet pipe 108, respectively, to achieve a heat flow counter-current effect, ensuring that the hot air is evenly distributed inside the oven and saving energy.

[0041] Conveying system startup: The conveyor motor 304 starts, driving the synchronous shaft 301 and chain 303 to rotate, opening the heating box door 404, placing the conveyor plate 306 along with the feeding tray 305 and the mixed insulator on the chain 303, driving the feeding tray 305 and the mixed insulator into the inner cavity of the heating box for uniform heating, improving product quality.

[0042] Temperature monitoring and regulation: Distributed temperature sensor group 204 monitors the temperature inside the insulation board 403 in real time and feeds the data back to control system 2. Control system 2, in conjunction with the control box 203 and human-machine interface device 202, precisely controls the speed of fan 104 and circulating pump 102 to maintain the target temperature inside the oven. Temperature warning light 201 indicates whether the current temperature meets the set requirements.

[0043] Drying complete: After the mixed insulators are uniformly heated and dried in the oven, they are conveyed out of the oven via the conveyor system 3. The operator confirms whether the drying process is complete through the human-machine interface device 202 and shuts down the oven or proceeds to the next step.

[0044] The beneficial effects of this utility model are summarized as follows: (1) High temperature uniformity: Through the optimized design of the thermal circulation system and the heat flow countercurrent technology, the hot air can be evenly distributed inside the oven, avoiding the problem of hot or cold spots in traditional ovens, improving temperature uniformity, thereby improving the drying quality of the new mixed insulator surface treatment reagent and achieving efficient drying.

[0045] (2) Low energy consumption: The optimized thermal circulation system and efficient hot air utilization significantly reduce energy consumption and save production costs.

[0046] (3) Intelligent management: The control system achieves precise monitoring and intelligent management of the oven's operating status through the coordinated action of temperature warning light 201, human-machine interaction device 203, control box 203 and distributed temperature sensor group 204, which improves the convenience and reliability of operation.

[0047] (4) Flexible conveying design: The conveying system adopts a design of synchronous shaft 301, conveying frame 302, chain 303, conveying motor 304, conveying plate 306 and feeding tray 305, which ensures stable transmission and flexible placement of products in the oven, adapts to new hybrid insulators of different sizes, and avoids shaking or displacement caused by shape mismatch.

[0048] (5) Good thermal insulation performance: The design of the insulation board 403 in the frame structure and the heating box shell 401 provides good thermal insulation effect and further improves thermal efficiency.

[0049] (6) Strong applicability: This oven is particularly suitable for the large-scale production of new hybrid insulators. It can significantly improve the finished product quality and production efficiency of the new hybrid insulator coating, and has high application value and good market prospects.

[0050] In other embodiments, the three air supply plates can also be integrally configured as U-shaped air supply plates with a U-shaped cross section. The U-shaped air supply plates have cavities inside and cover the top of the hybrid insulator. The U-shaped air supply plates have through holes facing the wall of the hybrid insulator as air outlets.

[0051] In other embodiments, the transmission motor 304 and the synchronous shaft 301 can be driven by gears; or, the transmission motor 304 can be directly connected to the sprocket on one side to drive the chain 303 on that side to rotate. Both ends of the synchronous shaft 301 are provided with sprockets. The chain 303 driven by the transmission motor 304 meshes with the sprocket at one end of the synchronous shaft, driving the synchronous shaft 301 to rotate. The sprocket at the other end of the synchronous shaft 301 meshes with the chain on the other side, driving the chain on the other side to rotate synchronously.

[0052] In other embodiments, the chain 303 may also be tensioned using a tensioning device, in which case the support plate can be eliminated.

[0053] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hot air circulating tunnel oven suitable for hybrid insulators, comprising a heating chamber, characterized in that: The heating box has openings at both ends, and a conveyor frame (302) passes through it. Both sides of the conveyor frame (302) are equipped with chains (303) driven by a conveyor motor. Conveyor plates (306) are detachably mounted on the chains (303) on both sides, and a feeding tray (305) is placed on the conveyor plates (306). A hot air circulation inlet pipe (101) passes through one end of the heating box. One end of the hot air circulation inlet pipe (101) extends into the inner cavity of the heating box, and the other end is connected to the inlet of a circulation pump (102). The outlet of the circulation pump (102) is connected to the inlet of a fan (104) through a fan connecting pipe (103). The outlet of the fan (104) is connected to the inlet of a duct heater (106). The outlet of the heater (106) is connected to the hot air circulation duct (108). The other end of the hot air circulation duct (108) passes through the other end of the heating box. Air supply plates are provided on the upper, left and right sides of the inner cavity of the heating box. The air supply plates are hollow structures. Through holes are distributed on the wall of the inner cavity of the heating box. The air supply plates are all connected to the hot air circulation duct (108). The heating box is equipped with a distributed temperature sensor group (204). The outside of the heating box is equipped with a human-machine interaction device (202) and a control box (203). The distributed temperature sensor group (204), the human-machine interaction device (202), the circulation pump (102), the fan (104) and the control box (203) are electrically connected.

2. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: The inlet of the air duct heater (106) is connected to the fan (104) through interface flange I (105), and the outlet is connected to the hot air circulation duct (108) through interface flange II (107).

3. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: The inner cavity of the air duct heater (106) forms a heater air duct (1061). The outer wall of the air duct heater (106) is provided with a junction box (1063). The junction box (1063) is provided with a cable inlet (1062). The junction box (1063) and the outer wall of the air duct heater (106) are connected by a heat insulation interface flange (1064). The electric heating tube (1065) in the air duct (1061) is electrically connected to the junction box (1063).

4. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: A temperature warning light (201) electrically connected to the control box (203) is installed on the outside of the heating box.

5. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: Both ends of the conveyor frame (302) are provided with sprockets for opening the corresponding chains (303). Two sprockets at one end of the conveyor frame (302) are connected by a synchronous shaft (301), and the conveyor motor (304) is connected to the synchronous shaft (301) for transmission.

6. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: The ends of both sides of the conveyor frame (302) are provided with sprockets for opening the corresponding chains (303). The conveyor motor (304) is directly connected to the sprocket on one side. Sprockets are provided at both ends of the synchronous shaft (301). The chain (303) driven by the conveyor motor (304) meshes with the sprocket at one end of the synchronous shaft, and the sprocket at the other end of the synchronous shaft (301) meshes with the chain on the other side.

7. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: A support plate fixed to the conveyor frame (302) is provided below the chain (303), so that the chain (303) can slide on the support plate.

8. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: The bottom of the heating box is provided with a support frame (402), and the control box (203) is installed on the support frame (402).

9. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: The inner wall of the heating box is equipped with an insulation board.

10. A hot air circulating tunnel oven suitable for hybrid insulators according to claim 1, characterized in that: The heating box has a door panel (404) and a cylinder (45) for driving the heating box door panel (404) to open and close at the openings at both ends.

Images