A temperature detection device for high-temperature tubular furnaces

Abstract

This invention relates to the field of tubular furnace technology, specifically to a temperature detection device for high-temperature tubular furnaces. It solves the problems of existing methods for monitoring the temperature during the heating process of high-temperature tubular furnaces, which require heating the heating tube as a whole, making it inconvenient to monitor the temperature of the heating tube from all angles. Furthermore, the monitoring process is easily affected by airflow, leading to inaccurate temperature detection results. The invention includes a heating isolation mechanism and temperature detection mechanisms. A furnace body mechanism is installed outside the heating isolation mechanism, and three temperature detection mechanisms are installed between the heating isolation mechanism and the furnace body mechanism. The furnace body mechanism includes a lower furnace hood. This invention achieves multi-point temperature monitoring by arranging the heating process of the high-temperature tubular furnace in a circumferential manner. Moreover, by actively extracting the heating airflow in one direction, it effectively prevents external airflow from interfering with the temperature detection results, resulting in more accurate detection.

Description

Technical Field

[0001] This invention relates to the field of tubular furnace technology, specifically to a temperature detection device for high-temperature tubular furnaces. Background Technology

[0002] A high-temperature tube furnace is a high-temperature furnace with an inner liner made of lightweight high-temperature fiber material. It is an openable furnace with two semi-circular furnace bodies for easy opening. The most basic function of a high-temperature tube furnace is to achieve high-temperature heating and sintering of materials. By precisely controlling the temperature inside the furnace, various materials can be subjected to high-temperature treatments such as sintering, melting, and crystallization, thereby improving their physical, chemical, and mechanical properties. High-temperature tube furnaces have atmosphere control and processing capabilities, allowing the introduction of different gases (such as inert gases and reducing gases) to create specific atmospheric environments to meet the special requirements of the material processing. During material processing in a high-temperature tube furnace, real-time temperature monitoring of the heating process is necessary. However, current temperature monitoring methods for the heating process in high-temperature tube furnaces require integral heating of the heating tubes, making it inconvenient to monitor the temperature of the heating tubes from all angles. Furthermore, the monitoring process is easily affected by airflow, leading to inaccurate temperature readings. Summary of the Invention

[0003] The purpose of this invention is to provide a temperature detection device for a high-temperature tubular furnace, in order to solve the problems mentioned in the background art regarding the existing temperature monitoring of the heating process of a high-temperature tubular furnace. Because the heating tube needs to be heated as a whole, it is not convenient to monitor the temperature of the outside of the heating tube from all angles, and the monitoring process is easily affected by air flow, resulting in deviations in the temperature detection results.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A temperature detection device for a high-temperature tubular furnace includes a heating isolation mechanism and a temperature detection mechanism. A furnace body mechanism is installed on the outer side of the heating isolation mechanism. Three temperature detection mechanisms are installed between the heating isolation mechanism and the furnace body mechanism. The furnace body mechanism includes a lower furnace cover, and an upper furnace cover is rotatably connected to the upper end of the lower furnace cover. The heating isolation mechanism includes two semi-circular heating covers. The outer surface of the semi-circular heating covers is provided with multiple heat-conducting grooves. Heating strips are installed on the inner side of the heat-conducting grooves. Ventilation gaps are provided between the semi-circular heating covers and the multiple heating strips on both sides. The temperature detection mechanism includes a ventilation frame, and one end of the ventilation frame is equipped with... The ventilation frame has a collection and exhaust base, and consists of a hollow ventilation plate and an arc-shaped guide pipe. The bottom end of the hollow ventilation plate is provided with multiple waist-shaped guide holes. A temperature monitoring probe is installed on the inner side of the waist-shaped guide holes. A fan box is fixedly installed on the inner side of the arc-shaped guide pipe near the collection and exhaust base. A one-way guide assembly is installed on one side of the fan box. A hollow guide ring is installed between the one-way guide assembly and the fan box. An injection pipe is installed on the upper end of the hollow guide ring. Multiple spray nozzles are provided on one side of the hollow guide ring. The one-way guide assembly includes a conical positioning ring, a sealing cone, a support spring, a connecting guide post, a ventilation limit seat, and a ventilation hole.

[0006] Preferably, the furnace body mechanism further includes a control box door that is rotatably connected to the center of the front end face of the lower furnace hood. Pipe end connectors are installed on the inner sides of both ends of the lower and upper furnace hoods. A heating tube is installed between the two pipe end connectors. A drive box is fixedly installed at one end of one of the pipe end connectors, and a pressure gauge is fixedly installed on the outer side of the other pipe end connector.

[0007] Preferably, the heating isolation mechanism further includes a lower isolation frame fixedly connected to the inner side of the upper end of the lower furnace hood, and an upper isolation frame is installed on the upper end surface of the lower isolation frame. The lower furnace hood and the upper furnace hood are fixedly connected to the two semi-circular heating covers respectively through the lower isolation frame and the upper isolation frame.

[0008] Preferably, each ventilation frame contains three ventilation hollow plates and three arc-shaped guide pipes. The three ventilation hollow plates are radially aligned with the semi-circular heating cover. The three arc-shaped guide pipes are linearly arranged along the side of the ventilation hollow plates. The three ventilation frames are linearly arranged along the axis of the semi-circular heating cover. The ventilation hollow plates and arc-shaped guide pipes are welded and fixed. The air collection and exhaust seat is connected to the ventilation hollow plates through the arc-shaped guide pipes.

[0009] Preferably, the arc-shaped guide tube and the heat conduction channel are connected through the waist-shaped guide hole, the temperature monitoring probe is fixedly connected to the ventilation hollow plate, the temperature monitoring probe is provided with a thermocouple inside, the bottom end of the thermocouple passes through the temperature monitoring probe and is inserted into the inner side of the heat conduction channel, and the heating strip is provided with an electric heating resistance wire inside.

[0010] Preferably, the unidirectional flow guide assembly is coaxial with the arc-shaped flow guide tube, the conical positioning ring is fixedly connected to the arc-shaped flow guide tube, the sealing cone head is in close contact with the inner wall of one end of the conical positioning ring, one end of the connecting guide post passes through the ventilation limiting seat and the support spring and is connected to the sealing cone head by a thread, and the ventilation limiting seat and the sealing cone head are connected by the support spring.

[0011] Preferably, the plurality of ventilation holes are arranged circumferentially relative to the axis of the ventilation limiting seat, the air collecting and exhaust seat and the conical positioning ring are connected through the plurality of ventilation holes, the connecting guide post and the sealing cone slide linearly back and forth along the axis of the ventilation limiting seat, and the fan box is provided with fan blades and a fan motor, the fan motor being a high-temperature resistant motor.

[0012] Preferably, the bottom end of the injection tube passes through the arc-shaped guide tube and is connected to multiple spray nozzles through a hollow guide ring. The hollow guide ring and the arc-shaped guide tube are fixedly connected through the injection tube, and the spray nozzles are connected to the hollow guide ring by threads.

[0013] Preferably, the two semicircular heating covers form a heating sleeve, and the plurality of heating strips are arranged in a circular pattern relative to the heating sleeve. The material of the two semicircular heating covers is ceramic fiber.

[0014] Preferably, the lower furnace hood and the upper furnace hood are both made of carbon steel, the heating tube is made of quartz tube, and the lower furnace hood and the heating tube are connected by two tube end connectors.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention incorporates an electric heating resistance wire inside the heating strip, enabling the heating resistance wire to uniformly heat the material inside the heating tube under the support of the heating sleeve. Two semi-circular heating covers are isolated by a lower and upper isolation frame. The fan box evacuates air from the cavity between the semi-circular heating covers and the heating tube via an arc-shaped guide pipe. A temperature monitoring probe is fixedly installed on the inner side of each waist-shaped guide hole. Through ventilation gaps, heat-conducting grooves, and waist-shaped guide holes, air in the cavity between the heating tube and the two semi-circular heating covers is sequentially guided to the inner side of the ventilation hollow plate. The ventilation hollow plate then delivers the hot airflow to the inner side of the air collection and exhaust seat via the arc-shaped guide pipe. Multiple waist-shaped guide holes allow for multi-point output of the hot airflow, and thermocouples enable comprehensive real-time monitoring of the temperature of the hot airflow on the outer surface of the heating tube, effectively preventing inaccurate temperature readings from the temperature monitoring probe due to temperature differences inside and outside the heating tube.

[0017] 2. This invention achieves real-time contact between the sealing cone and the conical positioning ring under the elastic support of the connecting guide column, preventing external warm and humid airflow from affecting the heating uniformity of the heating tube by the semi-circular heating cover. When the hot airflow flows inside the arc-shaped guide pipe, it pushes the sealing cone to separate from the conical positioning ring. At the same time, cold water is injected into the inner side of the hollow guide ring through the injection pipe. Then, the hollow guide ring can spray through multiple circumferentially arranged spray nozzles to uniformly cool the hot airflow between the fan box and the ventilation limit seat, effectively avoiding the shortening of the service life of the fan box due to high temperature. Moreover, the sealing cone, supported by the spring, can prevent moisture backflow from causing heating instability of the heating strip and the semi-circular heating cover. After the material is heated, the material is rapidly cooled by continuously extracting the hot airflow. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a front view of the entire invention;

[0020] Figure 3 This is a schematic diagram of the installation structure of the heating tube of the present invention;

[0021] Figure 4 This is a schematic diagram of the installation structure of the temperature detection mechanism of the present invention;

[0022] Figure 5 This is a schematic diagram of the installation structure of the ventilation frame of the present invention;

[0023] Figure 6 This is a partial cross-sectional structural diagram of the ventilation frame of the present invention;

[0024] Figure 7 This is a partial cross-sectional structural diagram of the ventilated hollow plate of the present invention;

[0025] Figure 8 This is a cross-sectional structural diagram of the temperature detection mechanism of the present invention;

[0026] Figure 9 For the present invention Figure 8 A magnified structural diagram of region A in the middle.

[0027] In the diagram: 1. Furnace body structure; 101. Lower furnace hood; 102. Upper furnace hood; 103. Control box door; 104. Drive box; 105. Pipe end connector; 106. Pressure gauge; 107. Heating tube; 2. Heating isolation mechanism; 201. Lower isolation frame; 202. Upper isolation frame; 203. Semi-circular heating cover; 204. Heating strip; 205. Heat conduction channel; 206. Ventilation gap; 3. Temperature detection mechanism; 301 302. Ventilation frame; 303. Collector and exhaust seat; 304. Hollow ventilation plate; 305. Arc-shaped guide pipe; 306. Waist-shaped guide hole; 307. Temperature monitoring probe; 308. Conical positioning ring; 309. Sealing cone; 310. Support spring; 311. Connecting guide post; 312. Ventilation limit seat; 313. Ventilation hole; 314. Hollow guide ring; 315. Liquid injection pipe; 316. Spray nozzle; 317. Fan box. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Please see Figures 1 to 4 The present invention provides an embodiment of a temperature detection device for a high-temperature tubular furnace, comprising a heating isolation mechanism 2 and a temperature detection mechanism 3. A furnace body mechanism 1 is installed on the outer side of the heating isolation mechanism 2. The furnace body mechanism 1 includes a lower furnace cover 101, an upper furnace cover 102 rotatably connected to the upper end of the lower furnace cover 101, and a control box door 103 rotatably connected to the middle of the front end face of the lower furnace cover 101. Pipe end connecting seats 105 are installed on the inner sides of both ends of the lower furnace cover 101 and the upper furnace cover 102. A connection is made between the two pipe end connecting seats 105. The furnace is equipped with a heating tube 107. The lower furnace cover 101 and the upper furnace cover 102 are both made of carbon steel. The heating tube 107 is made of quartz tube. The lower furnace cover 101 and the heating tube 107 are connected by two tube end connectors 105. One end of one tube end connector 105 is fixedly installed with a drive box 104, and the other end connector 105 is fixedly installed with a pressure gauge 106. The furnace body mechanism 1 facilitates the protective installation of the heating isolation mechanism 2 and the temperature detection mechanism 3, and effectively ventilates and isolates the high temperature.

[0030] Please see Figures 2 to 8The heating isolation mechanism 2 includes two semi-circular heating covers 203. The outer surface of the semi-circular heating cover 203 is provided with multiple heat-conducting grooves 205. Heating strips 204 are installed on the inner side of the heat-conducting grooves 205. The heating strips 204 are provided with electric heating resistance wires inside. Ventilation gaps 206 are provided between the semi-circular heating cover 203 and the multiple heating strips 204 on both sides. A lower isolation frame 201 is fixedly installed on the inner side of the upper end of the lower furnace cover 101. An upper isolation frame 202 is installed on the upper end face of the lower isolation frame 201. The lower furnace cover 101 and the upper furnace cover 102 are fixedly connected to the two semi-circular heating covers 203 through the lower isolation frame 201 and the upper isolation frame 202, respectively. The two semi-circular heating covers 203 form a heating sleeve. The multiple heating strips 204 are arranged in a circle relative to the heating sleeve. The material of the two semi-circular heating covers 203 is ceramic fiber, so that the electric heating resistance wires can perform uniform heating operation on the material in the heating tube 107 under the support of the heating sleeve.

[0031] Please see Figures 4 to 8 Three temperature detection mechanisms 3 are installed between the heating isolation mechanism 2 and the furnace body mechanism 1. The temperature detection mechanism 3 includes a ventilation frame 301. One end of the ventilation frame 301 is equipped with a collection and exhaust seat 302. The ventilation frame 301 is composed of a ventilation hollow plate 303 and an arc-shaped guide pipe 304. Each ventilation frame 301 has three ventilation hollow plates 303 and three arc-shaped guide pipes 304. The three ventilation hollow plates 303 are radially coincident with the semi-circular heating cover 203. The three arc-shaped guide pipes 304 are arranged linearly along the side of the ventilation hollow plate 303. The three ventilation frames 301 are arranged linearly along the axis of the semi-circular heating cover 203. The ventilation hollow plate 303 and the arc-shaped guide pipe 304 are welded and fixed. The collection and exhaust seat 302 and the ventilation hollow plate 303 are connected through the arc-shaped guide pipe 304. The hot airflow can be output at multiple points through multiple waist-shaped guide holes 305.

[0032] The bottom end of the ventilation hollow plate 303 is provided with multiple waist-shaped guide holes 305. A temperature monitoring probe 306 is installed inside the waist-shaped guide hole 305. The arc-shaped guide pipe 304 and the heat conduction groove 205 are connected through the waist-shaped guide holes 305. The temperature monitoring probe 306 is fixedly connected to the ventilation hollow plate 303. A thermocouple is provided inside the temperature monitoring probe 306. The bottom end of the thermocouple passes through the temperature monitoring probe 306 and is inserted into the inside of the heat conduction groove 205. The thermocouple can be used to monitor the temperature of the hot airflow on the outer surface of the heating tube 107 in real time, effectively avoiding the inaccurate temperature detection results of the temperature monitoring probe 306 caused by the temperature difference inside and outside the heating tube 107.

[0033] A fan box 316 is fixedly installed on the inner side of the arc-shaped guide pipe 304 near the air collection and exhaust seat 302. A hollow guide ring 313 is installed between the unidirectional guide assembly and the fan box 316. An injection pipe 314 is installed at the upper end of the hollow guide ring 313. Multiple spray nozzles 315 are provided on one side of the hollow guide ring 313. The bottom end of the injection pipe 314 passes through the arc-shaped guide pipe 304 and is connected to the multiple spray nozzles 315 through the hollow guide ring 313. The hollow guide ring 313 and the arc-shaped guide pipe 304 are fixedly connected through the injection pipe 314. The spray nozzles 315 are connected to the hollow guide ring 313 by threads. The spray nozzles 315 can spray and uniformly cool the hot airflow between the fan box 316 and the ventilation limit seat 311, effectively preventing the fan box 316 from being shortened due to high temperature.

[0034] Please see Figure 8 and Figure 9 A one-way airflow guide assembly is installed on one side of the fan housing 316. The one-way airflow guide assembly is coaxial with the arc-shaped airflow guide tube 304. The one-way airflow guide assembly includes a conical positioning ring 307, a blocking cone 308, a support spring 309, a connecting guide post 310, a ventilation limiting seat 311, and ventilation holes 312. The conical positioning ring 307 is fixedly connected to the arc-shaped airflow guide tube 304. The blocking cone 308 is in close contact with the inner wall of one end of the conical positioning ring 307. One end of the connecting guide post 310 passes through the ventilation limiting seat 311 and the support spring 309 and is threadedly connected to the blocking cone 308. The ventilation limiting seat 311 is connected to the blocking cone 308 through the support spring 309. Multiple ventilation holes 312 are provided. 2. The air intake and exhaust seat 302 and the conical positioning ring 307 are arranged in a circle relative to the axis of the ventilation limit seat 311. The air intake and exhaust seat 302 and the conical positioning ring 307 are connected through multiple ventilation holes 312. The connecting guide post 310 and the sealing cone 308 slide linearly back and forth along the axis of the ventilation limit seat 311. The fan box 316 is equipped with fan blades and a fan motor. The fan motor is a high temperature resistant motor. The sealing cone 308 can prevent the backflow of moisture when the fan box 316 extracts hot air and cause unstable heating of the heating strip 204 and the semi-circular heating cover 203. After the material is heated, the fan box 316 continuously extracts hot air to achieve rapid cooling of the material.

[0035] In summary, when using a high-temperature tubular furnace to process materials at high temperatures, the lower furnace cover 101 and the upper furnace cover 102 are fixedly connected to the two semi-circular heating covers 203 via the lower isolation frame 201 and the upper isolation frame 202, respectively. The power is turned on, and the lower furnace cover 101 is connected to the heating tube 107 via two tube end connectors 105. The material to be processed is placed inside the heating tube 107, and the lower furnace cover 101 and the upper furnace cover 102 are closed by hinges. Air is extracted from the inside of the heating tube 107 and the pressure is monitored by the pressure gauge 106. The power is turned on, and the two semi-circular heating covers 203 form a heating sleeve. Multiple heat-conducting grooves 205 arranged in a circle are provided on the outer surface of the heating sleeve. A heating strip 204 is fixedly installed inside each heat-conducting groove 205, and an electric heating resistance wire is provided inside the heating strip 204. Under the support of the heating sleeve, the electric heating resistance wire can uniformly heat the material inside the heating tube 107.

[0036] The two semi-circular heating covers 203 are isolated by the lower isolation frame 201 and the upper isolation frame 202. Three temperature detection mechanisms 3 are installed between the upper furnace cover 102 and the upper isolation frame 202 in a linear arrangement. The air collection and exhaust seat 302 and the ventilation hollow plate 303 are connected through the arc-shaped guide pipe 304. The fan box 316 is started so that the fan box 316 can evacuate the cavity between the semi-circular heating cover 203 and the heating pipe 107 through the arc-shaped guide pipe 304.

[0037] Specifically, the bottom end of the ventilation hollow plate 303 is provided with multiple waist-shaped guide holes 305, which connect the ventilation hollow plate 303 and the heat conduction channel 205 through the multiple waist-shaped guide holes 305. A temperature monitoring probe 306 is fixedly installed on the inner side of each waist-shaped guide hole 305. When the fan box 316 is evacuating air, the air in the cavity between the heating tube 107 and the two semi-circular heating covers 203 can be sequentially guided through the ventilation gap 206, the heat conduction channel 205 and the waist-shaped guide holes 305 to the ventilation gap 206, the heat conduction channel 205 and the waist-shaped guide holes 305. The ventilation hollow plate 303 is located inside the air-conditioning plate 303. The air-conditioning plate 303 can transport hot air to the inside of the air-conditioning base 302 through the arc-shaped guide pipe 304. The hot air can be output at multiple points through multiple waist-shaped guide holes 305. At this time, the thermocouple installed inside the temperature monitoring probe 306 can monitor the temperature of the hot air on the outer surface of the heating tube 107 in real time, effectively avoiding the inaccuracy of the temperature detection result of the temperature monitoring probe 306 caused by the temperature difference inside and outside the heating tube 107.

[0038] A one-way flow guide assembly is installed on one side of the hollow flow guide ring 313. The sealing cone 308 is in real-time contact with the conical positioning ring 307 under the elastic support of the connecting guide post 310, so as to avoid the external warm and humid airflow affecting the heating uniformity of the semi-circular heating cover 203 to the heating tube 107. When the hot airflow flows inside the arc-shaped flow guide tube 304, it pushes the sealing cone 308 to separate from the conical positioning ring 307. Then, the connecting guide post 310 is guided by the ventilation limit seat 311 and drives the sealing cone 308 to compress the support spring 309. Then, the hot airflow can be delivered to the inside of the collection and exhaust seat 302 through the guidance of multiple ventilation holes 312.

[0039] Simultaneously, cold water is injected into the inner side of the hollow guide ring 313 through the injection pipe 314. The hollow guide ring 313 can then spray water through multiple circumferentially arranged spray nozzles 315 to uniformly cool the hot airflow between the fan box 316 and the ventilation limit seat 311, effectively preventing the fan box 316 from being shortened due to high temperature. Furthermore, the sealing cone 308, through the support spring 309, can prevent moisture backflow from causing unstable heating of the heating strip 204 and the semi-circular heating cover 203. After the material is heated, the material is rapidly cooled by continuously extracting the hot airflow.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A temperature detection device for a high-temperature tubular furnace, comprising a heating isolation mechanism (2) and a temperature detection mechanism (3), characterized in that: A furnace body mechanism (1) is installed on the outside of the heating isolation mechanism (2). Three temperature detection mechanisms (3) are installed between the heating isolation mechanism (2) and the furnace body mechanism (1). The furnace body mechanism (1) includes a lower furnace cover (101), and an upper furnace cover (102) is rotatably connected to the upper end of the lower furnace cover (101). The heating isolation mechanism (2) includes two semi-circular heating covers (203). Multiple heat-conducting grooves (205) are provided on the outer surface of the semi-circular heating covers (203). Heating strips (204) are installed on the inner side of the heat-conducting grooves (205). Ventilation gaps (206) are provided between the semi-circular heating covers (203) and the multiple heating strips (204) on both sides. The temperature detection mechanism (3) includes a ventilation frame (301). A collection and exhaust seat (302) is installed at one end of the ventilation frame (301). The ventilation frame (301) is composed of a ventilation hollow plate (303). The ventilation hollow plate (303) is composed of an arc-shaped guide pipe (304). Multiple waist-shaped guide holes (305) are provided at the bottom end of the hollow plate (303). A temperature monitoring probe (306) is installed inside the waist-shaped guide hole (305). A fan box (316) is fixedly installed on the inner side of the arc-shaped guide pipe (304) near the end of the air collection and exhaust seat (302). A one-way guide assembly is installed on one side of the fan box (316). The one-way guide assembly is connected to... A hollow guide ring (313) is installed between the fan boxes (316). A liquid injection pipe (314) is installed at the upper end of the hollow guide ring (313). A plurality of spray nozzles (315) are provided on one side of the hollow guide ring (313). The unidirectional guide assembly includes a conical positioning ring (307), a sealing cone (308), a support spring (309), a connecting guide post (310), a ventilation limit seat (311), and a ventilation hole (312).

2. The temperature detection device for a high-temperature tubular furnace according to claim 1, characterized in that: The furnace body mechanism (1) also includes a control box door (103) that is rotatably connected to the middle of the front end face of the lower furnace cover (101). Pipe end connectors (105) are installed on the inner sides of both ends of the lower furnace cover (101) and the upper furnace cover (102). A heating tube (107) is installed between the two pipe end connectors (105). A drive box (104) is fixedly installed at one end of one of the pipe end connectors (105), and a pressure gauge (106) is fixedly installed on the outer side of the other pipe end connector (105).

3. The temperature detection device for a high-temperature tubular furnace according to claim 2, characterized in that: The heating isolation mechanism (2) further includes a lower isolation frame (201) fixedly connected to the inner side of the upper end of the lower furnace cover (101). An upper isolation frame (202) is installed on the upper end face of the lower isolation frame (201). The lower furnace cover (101) and the upper furnace cover (102) are fixedly connected to the two semi-circular heating covers (203) through the lower isolation frame (201) and the upper isolation frame (202) respectively.

4. The temperature detection device for a high-temperature tubular furnace according to claim 3, characterized in that: Each ventilation frame (301) contains three ventilation hollow plates (303) and three arc-shaped guide pipes (304). The three ventilation hollow plates (303) are radially aligned with the semi-circular heating cover (203). The three arc-shaped guide pipes (304) are arranged linearly along the side of the ventilation hollow plate (303). The three ventilation frames (301) are arranged linearly along the axis of the semi-circular heating cover (203). The ventilation hollow plates (303) and the arc-shaped guide pipes (304) are welded and fixed. The air collection and exhaust seat (302) is connected to the ventilation hollow plate (303) through the arc-shaped guide pipes (304).

5. The temperature detection device for a high-temperature tubular furnace according to claim 4, characterized in that: The arc-shaped guide tube (304) and the heat-conducting groove (205) are connected through the waist-shaped guide hole (305). The temperature monitoring probe (306) is fixedly connected to the ventilation hollow plate (303). The temperature monitoring probe (306) is equipped with a thermocouple inside. The bottom end of the thermocouple passes through the temperature monitoring probe (306) and is inserted into the inner side of the heat-conducting groove (205). The heating strip (204) is equipped with an electric heating resistance wire inside.

6. The temperature detection device for a high-temperature tubular furnace according to claim 5, characterized in that: The unidirectional flow guide assembly is coaxial with the arc-shaped flow guide tube (304), the conical positioning ring (307) is fixedly connected to the arc-shaped flow guide tube (304), the sealing cone (308) is in close contact with the inner wall of one end of the conical positioning ring (307), one end of the connecting guide post (310) passes through the ventilation limiting seat (311) and the support spring (309) and is connected to the sealing cone (308) by a thread, and the ventilation limiting seat (311) and the sealing cone (308) are connected by the support spring (309).

7. The temperature detection device for a high-temperature tubular furnace according to claim 6, characterized in that: The plurality of ventilation holes (312) are arranged in a circle relative to the axis of the ventilation limiting seat (311). The air collection and exhaust seat (302) and the conical positioning ring (307) are connected through the plurality of ventilation holes (312). The connecting guide post (310) and the sealing cone (308) slide linearly back and forth along the axis of the ventilation limiting seat (311). The fan box (316) is provided with fan blades and a fan motor inside. The fan motor is a high temperature resistant motor.

8. The temperature detection device for a high-temperature tubular furnace according to claim 7, characterized in that: The bottom end of the injection tube (314) passes through the arc-shaped guide tube (304) and is connected to multiple spray nozzles (315) through a hollow guide ring (313). The hollow guide ring (313) and the arc-shaped guide tube (304) are fixedly connected through the injection tube (314). The spray nozzles (315) and the hollow guide ring (313) are connected by threads.

9. The temperature detection device for a high-temperature tubular furnace according to claim 8, characterized in that: The two semicircular heating covers (203) form a heating sleeve, and the multiple heating strips (204) are arranged in a circle relative to the heating sleeve. The material of the two semicircular heating covers (203) is ceramic fiber.

10. The temperature detection device for a high-temperature tubular furnace according to claim 9, characterized in that: The lower furnace cover (101) and the upper furnace cover (102) are both made of carbon steel, and the heating tube (107) is made of quartz tube. The lower furnace cover (101) and the heating tube (107) are connected by two tube end connectors (105).

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