Multi-zone temperature control tube furnace

Abstract

The invention discloses a multi-zone temperature control tube furnace, and relates to the technical field of tube furnaces, the multi-zone temperature control tube furnace comprises an equipment bin and a heating bin; a plurality of heat insulation plates are installed in the heating bin and divide the interior of the heating bin into a plurality of temperature zones. An electric heating rod is arranged in each temperature zone; a combustion tube and a temperature sensor are mounted in each temperature zone; the combustion tube is used for placing samples; a through hole is formed in the heat insulation plate; a blocking plate is arranged on one side of the heat insulation plate; and an electric push rod is mounted in the equipment bin, is connected with the plugging plate and is used for moving the plugging plate so as to control closing and opening of the through hole. The heating process of various samples can be completed at a time, the experiment speed is increased, and the experiment efficiency is improved; through opening of the through holes, rapid heat exchange between the adjacent temperature zones is achieved, even if part of the electric heating rods break down, normal operation of the whole equipment cannot be affected, and the use stability of the equipment can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of tube furnaces, in particular to a multi-zone temperature-controlled tube furnace. Background Art

[0002] A tubular furnace is a high-temperature heating device with a sealed tubular cavity at its core. It enables processes such as material heat treatment, chemical reactions, and synthesis through precise temperature control. Its core advantages lie in its uniform temperature field, controllable atmosphere, and flexible adaptability. It is widely used in materials science, chemical synthesis, semiconductors, and new energy fields.

[0003] The three-zone tubular furnace is a high-end heat treatment equipment with multiple independent temperature controls. By dividing the furnace into three independent temperature zones: front, middle, and back, it enables temperature gradient control or expansion of a long, uniform temperature zone, making it suitable for complex process scenarios (such as crystal growth and gradient material synthesis). Each zone is equipped with independent silicon carbon rods or silicon molybdenum rods, with an adjustable power distribution ratio (e.g., 30%:40%:30%). Alumina fiber modules separate the temperature zones to reduce thermal interference.

[0004] However, each temperature zone of the existing three-zone tubular furnace uses independent electric heating. Once the electric heating equipment in one temperature zone is damaged, the combustion tube in this temperature zone of the tubular furnace will not be able to be used normally, which has certain disadvantages. In addition, the existing three-zone tubular furnace adopts a single tube design, which can only heat one experimental sample at a time, and the experimental efficiency is low. Summary of the Invention

[0005] In order to overcome the above-mentioned defects in the prior art, the present invention provides a multi-zone temperature-controlled tubular furnace, which can improve the use stability and efficiency of the equipment.

[0006] To achieve the above object, the present invention adopts the following technical solutions, including:

[0007] A multi-zone temperature-controlled tubular furnace comprises: an equipment chamber and a heating chamber;

[0008] A plurality of heat insulation panels are installed in the heating chamber, and the heating chamber is divided into a plurality of temperature zones by the heat insulation panels;

[0009] Each temperature zone is provided with an independent heating source, and the independent heating source includes an electric heating rod installed in the heating chamber; a control terminal is installed in the equipment chamber; the control terminal is electrically connected to the electric heating rod and is used to control the operation of the electric heating rod;

[0010] A combustion tube and a temperature sensor are installed in each temperature zone; the combustion tube is used to place the sample; the temperature sensor is used to measure the temperature in each temperature zone, and the temperature sensor is electrically connected to the control terminal;

[0011] A through hole is set on the insulation board, and a blocking mechanism is set on one side of the insulation board; the blocking mechanism includes a blocking plate; an electric push rod is installed in the equipment compartment, and the electric push rod is electrically connected to the control end; the electric push rod is connected to the blocking plate, and is used to move the blocking plate, thereby controlling the closing and opening of the through hole.

[0012] Preferably, a heat absorption end is installed in the heating chamber, a refrigeration device is installed in the equipment chamber, and a heat release end is installed outside the equipment chamber. The refrigeration device is connected to the heat absorption end and the heat release end respectively. The refrigeration device is used to absorb heat in the heating chamber through the heat absorption end and release heat through the heat release end.

[0013] Preferably, the heating chamber comprises a hinged bottom chamber and an upper cover; the heat insulation board is composed of two half-boards respectively installed in the bottom chamber and the upper cover;

[0014] A quick fixing mechanism is installed on both sides of the bottom bin, and the quick fixing mechanism includes a hinged first arc block and a second arc block. The size of the circular ring formed by the first arc block and the second arc block after closing is adapted to the diameter of the combustion tube, and is used to fix the combustion tube; the first arc block is fixedly connected to the bottom bin, and the first arc block and the second arc block are respectively provided with corresponding positioning grooves and pin rods; a pad is also installed on the first arc block.

[0015] Preferably, the heating chamber includes a hinged bottom chamber and an upper cover; a lock and a travel switch are installed on the bottom chamber; the travel switch is used to close when the upper cover closes on the bottom chamber and touches the travel switch, and the lock is used to lock the upper cover and the bottom chamber when the travel switch is closed.

[0016] Preferably, an air inlet joint and an air outlet joint are respectively installed at both ends of the combustion tube; a pressure gauge is installed on the air inlet joint, and a valve is installed on the air outlet joint.

[0017] Preferably, a honeycomb ceramic tail gas treatment tube is installed in the combustion tube.

[0018] Preferably, an intelligent instrument, a temperature adjustment button and a control button group are provided on the equipment compartment; the intelligent instrument is used to display the temperature of each temperature zone in the heating compartment and the power of each electric heating rod; the temperature adjustment button is used to set the target temperature value of the electric heating rod; the control button group includes a main power button, a start button, a stop button and an emergency stop button.

[0019] Preferably, the inner wall of the combustion tube is coated with a repair coating containing nano-ceramic particles.

[0020] Preferably, the working process is as follows:

[0021] Different or the same samples are added to each combustion tube, and the control end controls the electric heating rods in each temperature zone to heat them. The temperature sensor measures the temperature in each temperature zone and transmits the temperature data to the control end in real time. The control end controls the operation of the electric heating rods in real time based on the temperature data, so that the samples in each combustion tube can reach the corresponding design temperature.

[0022] If the electric heating rod in a certain temperature zone fails, the through hole on the insulation board separated from the adjacent temperature zone will be opened. The specific operation is as follows: the control end controls the electric push rod to start, the output shaft of the electric push rod shortens and pulls the sealing plate down to expose the through hole, and the hot air in the adjacent temperature zone enters the temperature zone through the through hole; during this process, the control end controls the operation of the electric heating rod in the adjacent temperature zone in real time according to the temperature data.

[0023] Preferably, an inert gas, a reducing gas or a mixed gas is introduced into the combustion tube; or the combustion tube is vacuumed.

[0024] The advantages of the present invention are:

[0025] (1) The present invention sets up an equipment chamber and a heating chamber, and sets up multiple temperature zones in the heating chamber. An independent heating source and an independent combustion tube are set in each temperature zone. The multiple combustion tubes are heated separately, and the heating process of multiple samples can be completed at one time, which is beneficial to improving the experimental speed and efficiency. By setting up a blocking mechanism, the independent heating source in the adjacent temperature zone can be replaced by the adjacent independent heating source, so that the faulty temperature zone can be heated normally, thereby improving the stability of the equipment.

[0026] (2) The present invention can conveniently cool down the combustion tube by providing a heat absorbing end, a refrigeration device and a heat releasing end.

[0027] (3) The present invention can facilitate the rapid installation and disassembly of the combustion tube by providing a quick fixing mechanism.

[0028] (4) The present invention can flexibly fix the combustion tube in the quick fixing mechanism by installing a pad on the quick fixing mechanism, thereby reducing surface damage to the combustion tube.

[0029] (5) The present invention can conveniently treat the generated exhaust gas and reduce exhaust gas emission pollution by installing a honeycomb ceramic exhaust gas treatment tube in the combustion tube.

[0030] (6) The present invention can facilitate the automatic repair of the combustion tube by coating the inner wall of the combustion tube with an intelligent repair coating containing nano-ceramic particles, which is beneficial to improving the service life of the combustion tube.

[0031] (7) The present invention provides an air inlet joint and an air outlet joint at both ends of the combustion tube, thereby conveniently controlling the air inlet and outlet of the combustion tube and achieving atmosphere control in the combustion tube.

[0032] (8) The present invention can conveniently close and lock the bottom chamber and the upper cover by installing a lock and a travel switch, so that the heating chamber is sealed.

[0033] (9) The present invention can conveniently display and set the target temperature and real-time temperature of each temperature zone in the heating chamber by providing an intelligent instrument and temperature adjustment buttons. By providing a control button group, the start and stop control of the equipment can be conveniently realized.

[0034] (10) The present invention controls the opening of the through-holes to achieve rapid heat exchange between adjacent temperature zones, replacing the electric heating rods in the faulty temperature zone to heat the combustion tubes in the faulty temperature zone. This ensures that even if some of the electric heating rods fail, the normal operation of the entire device will not be affected, thereby improving the stability of the device. Furthermore, the heating rate and temperature of the combustion tube can be controlled by controlling the exposed size of the through-holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic structural diagram of a multi-zone temperature-controlled tubular furnace provided by the present invention;

[0036] Figure 2 for Figure 1 A schematic side cross-sectional view of a multi-zone temperature-controlled tubular furnace is shown;

[0037] Figure 3 for Figure 1 The schematic diagram of the use of the multi-zone temperature-controlled tube furnace shown;

[0038] Figure 4 for Figure 1 Schematic diagram of disassembly and assembly of combustion tube in multi-zone temperature-controlled tubular furnace shown;

[0039] Figure 5 for Figure 1 A schematic structural diagram of a quick fixing mechanism in a multi-zone temperature-controlled tubular furnace is shown;

[0040] Figure 6 for Figure 1 The schematic diagram of the structure of the combustion tube in the multi-zone temperature-controlled tubular furnace shown;

[0041] Figure 7 for Figure 1 The schematic diagram of the structure of the honeycomb ceramic tail gas treatment tube in the multi-zone temperature-controlled tubular furnace is shown.

[0042] Among them, the names corresponding to the figure marks are: 1-equipment compartment, 2-heating compartment, 3-combustion tube, 4-bottom compartment, 5-upper cover, 6-heat insulation board, 7-electric heating rod, 8-control end, 9-temperature sensor, 10-through hole, 11-sealing plate, 12-electric push rod, 13-heat absorption end, 14-refrigeration equipment, 15-heat release end, 16-quick fixing mechanism, 17-first arc block, 18-second arc block, 19-pin rod, 20-positioning groove, 21-pad, 22-air inlet connector, 23-pressure gauge, 24-air outlet connector, 25-valve, 26-honeycomb ceramic exhaust treatment pipe, 27-lock, 28-travel switch, 29-intelligent instrument, 30-temperature adjustment button, 31-control button group. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] Example 1:

[0045] like Figure 1-7As shown, the multi-zone temperature-controlled tubular furnace provided by the present invention comprises: an equipment bin 1 and a heating bin 2 arranged on the top of the equipment bin 1, a plurality of heat insulation plates 6 are installed in the heating bin 2, and the interior of the heating bin 2 is divided into three temperature zones by the heat insulation plates 6. Independent heating sources are arranged in the three temperature zones, and the independent heating sources comprise electric heating rods 7 installed in the heating bin 2. The electric heating rods 7 can select silicon carbon rods / silicon molybdenum rods, and the electric heating rods 7 are electrically connected to the control end 8 installed in the equipment bin 1. Combustion tubes 3 and temperature sensors 9 are respectively installed in the three temperature zones. According to the heating temperature, pipes of different materials can be selected, such as corundum tubes, quartz tubes, etc. Different samples can be placed in the multiple combustion tubes 3 respectively. A through hole 10 is provided on the heat insulation plate 6, and the heat exchange speed on both sides of the heat insulation plate 6 can be accelerated through the through hole 10. A blocking mechanism is provided on one side of the heat insulation plate 6, and the blocking mechanism comprises a blocking plate 11 made of heat insulation material. The blocking plate 11 is connected to an electric push rod 12 installed in the equipment bin 1. When in use, multiple combustion tubes 3 can be Different experimental samples are added respectively, and the electric heating rod 7 is controlled by the control end 8 to heat each temperature zone so that the sample in each combustion tube 3 can reach the designed temperature. The temperature sensor 9 detects the temperature of each temperature zone and transmits the data to the control end 8. The control end 8 controls the start / stop of the electric heating rod 7 in a timely manner. The control program can be designed according to the existing three-temperature zone tube furnace, which will not be described in detail here, so that the temperature of each temperature zone reaches the heating temperature value of each combustion tube 3. If one of the electric heating rods 7 is damaged, the through hole 10 of the adjacent temperature zone (the temperature is higher than the side of the temperature zone) is opened. The specific operation is as follows: the electric push rod 12 is controlled to start, so that its output shaft is shortened and drives the sealing plate 11 to descend, so that the through hole 10 is exposed, and the hot air in the adjacent temperature zone enters the current temperature zone through the through hole 10, realizing rapid heat exchange, replacing the damaged electric heating rod 7 in the current temperature zone, and realizing heating of the combustion tube 3 in the current temperature zone. The heating speed and temperature of the combustion tube 3 can be controlled by controlling the exposure size of the through hole 10. Therefore, even if part of the electric heating rod 7 is damaged, it will not affect the normal operation of the entire device. This is beneficial to improving the stability of the device. It is worth noting that this method of use is suitable for short-term replacement use and is not suitable for long-term use. The present invention adopts a multi-tube structural design, which can complete the heating process of multiple samples in each combustion tube 3 at one time, thereby saving experimental time and improving experimental efficiency. It is worth noting that the sample loading and subsequent use process in the combustion tube 3 can refer to the existing tubular furnace usage regulations, which will not be repeated here.

[0046] By setting up an equipment chamber 1 and a heating chamber 2, and setting up an independent heating source in the heating chamber 2, multiple combustion tubes 3 are heated separately, and the heating process of multiple samples can be completed at one time, which is beneficial to improving the experimental speed and efficiency. By setting up a blocking mechanism, the adjacent independent heating source can be used to replace the independent heating source in the adjacent temperature zone, so that the combustion tube 3 in the temperature zone can be heated normally, thereby improving the stability of the equipment.

[0047] Example 2:

[0048] like Figure 2 As shown, a heat absorption end 13 is installed in the heating chamber 2, a refrigeration device 14 is installed in the equipment chamber 1, and a heat release end 15 is installed at the bottom of the equipment chamber 1. The refrigeration device 14 is connected to the heat absorption end 13 and the heat release end 15. When in use, the refrigeration device 14 can absorb heat from each temperature zone in the heating chamber 2 through the heat absorption end 13 and release heat through the heat release end 15, which can effectively reduce the temperature in the heating chamber 2 and cool the combustion tube 3.

[0049] By providing the heat absorbing end 13 , the refrigeration device 14 and the heat releasing end 15 , the combustion tube 3 can be cooled conveniently.

[0050] Example 3:

[0051] like Figure 2-5 As shown, the heating chamber 2 includes a hinged bottom chamber 4 and an upper cover 5, and the heat insulation board 6 is composed of two half-plates respectively installed on the bottom chamber 4 and the upper cover 5. In order to facilitate the disassembly of the combustion tube 3, a quick fixing mechanism 16 is installed on both sides of the bottom chamber 4. The quick fixing mechanism 16 includes a hinged first arc block 17 and a second arc block 18. The first arc block 17 is fixedly connected to the bottom chamber 4, and a positioning groove 20 is opened on one side of the first arc block 17. A pin rod 19 is installed on the second arc block 18. The pin rod 19 is a spring pin and can be pulled outward. When in use, the combustion tube 3 is placed on the arc groove of the first arc block 17, and then the second arc block 18 is flipped over so that the pin rod 19 is aligned with the positioning groove 20, and the pin rod 19 is inserted into the positioning groove 20 to fix the combustion tube 3. Conversely, the combustion tube 3 can be quickly disassembled. This structural design can facilitate the installation and disassembly of the combustion tube 3 and is more convenient to use.

[0052] By providing the quick fixing mechanism 16 , the combustion tube 3 can be quickly installed and disassembled.

[0053] Example 4:

[0054] like Figure 5 As shown, a pad 21 is installed on the first arc block 17. The pad 21 is made of soft high-temperature resistant material. When in use, the combustion tube 3 contacts and squeezes the pad 21, so that the combustion tube 3 is flexibly fixed in the quick fixing mechanism 16.

[0055] By installing the spacer block 21 on the first arc-shaped block 17 , the combustion tube 3 can be flexibly fixed in the quick fixing mechanism 16 , thereby reducing surface damage to the combustion tube 3 .

[0056] Example 5:

[0057] like Figure 6 As shown, in this embodiment, an air inlet connector 22 is installed at the air inlet end of the combustion tube 3, through which an inert gas or other types of gas can be introduced, and a pressure gauge 23 is installed on the air inlet connector 22, through which the air inlet pressure value can be checked. An air outlet connector 24 is installed at the air outlet end of the combustion tube 3, and a valve 25 is installed on the air outlet connector 24. The valve 25 is a needle valve or other types, which will not be described in detail here. When in use, inert gas (N2, Ar), reducing gas (H2) or a mixed gas can be introduced into the combustion tube 3 from the air inlet connector 22, so that the sample in the combustion tube 3 contacts the gas (to prevent reaction or to participate in reaction), thereby realizing atmosphere control in the combustion tube 3. Similarly, the air inlet connector 22 at the air inlet end can also be replaced with a plug to seal the air inlet end, and the air outlet connector 24 at the air outlet end can be connected to a vacuum pump or other equipment to evacuate the interior of the combustion tube 3 to achieve a near vacuum state in the combustion tube 3, thereby realizing multiple atmosphere controls in the combustion tube 3. It is worth noting that the connection method between the combustion tube 3 and the air inlet connector 22 and the air outlet connector 24 can be flange connection, threaded connection, hinged connection and other connection methods. Of course, they can only be used under the premise that their sealing must be guaranteed.

[0058] By providing the air inlet connector 22 and the air outlet connector 24 , the air inlet and outlet of the combustion tube 3 can be conveniently controlled, thereby achieving atmosphere control of the combustion tube 3 .

[0059] Example 6:

[0060] like Figure 7 As shown, a honeycomb ceramic exhaust gas treatment tube 26 for exhaust gas treatment can be installed in the combustion tube 3 according to experimental needs. The honeycomb ceramic exhaust gas treatment tube 26 has a honeycomb structure and does not affect the passage of gas when placed in the combustion tube 3. The outer diameter of the honeycomb ceramic exhaust gas treatment tube 26 is slightly smaller than the inner diameter of the combustion tube 3. The honeycomb ceramic exhaust gas treatment tube 26 can be added with ZrO2-CeO2 composite carrier + Pt / Pd, or V2O5-WO3 / TiO2, or Pt / Al2O3 and other substances according to experimental needs, which correspond to the treatment of CO, VOCs, nitrogen oxides, etc. in the exhaust gas, thereby being able to treat the discharged exhaust gas and reduce emission pollution.

[0061] By installing the honeycomb ceramic tail gas treatment tube 26 in the combustion tube 3, the tail gas generated can be easily treated and the tail gas emission pollution can be reduced.

[0062] Example 7:

[0063] like Figure 3 As shown, a lock 27 is installed on the bottom bin 4. The lock 27 is a mechanical lock or an electronic lock, which can lock the upper cover 5 and the bottom bin 4 when they are closed. At the same time, a limit switch 28 is installed on one side of the bottom bin 4. When the upper cover 5 is closed on the bottom bin 4, only when the upper cover 5 touches the limit switch 28, the limit switch 28 is closed, and then the lock 27 can be locked.

[0064] By installing the lock 27 and the travel switch 28, the bottom chamber 4 and the upper cover 5 can be conveniently closed and locked, so that the heating chamber 2 is sealed.

[0065] Example 8:

[0066] like Figure 3-4 As shown, in this embodiment, a plurality of smart meters 29 are installed on the front side of the equipment warehouse 1. The smart meters 29 respectively display the temperatures of the three temperature zones in the heating warehouse 2 and the real-time power of the electric heating rod 7, and a temperature adjustment button 30 is provided on one side of the smart meter 29. The target temperature value of the electric heating rod 7 can be set by the temperature adjustment button 30.

[0067] By providing the intelligent meter 29 and the temperature adjustment button 30 , the target temperature and real-time temperature of each temperature zone in the heating chamber 2 can be conveniently displayed and set.

[0068] Example 9:

[0069] like Figure 2-3 As shown, in this embodiment, a control button group 31 is installed on the front side of the equipment compartment 1. The control button group 31 includes a main power button, a start button, a stop button, an emergency stop button, etc., which are used to control the start and stop of the equipment. Of course, it is worth mentioning that the start button of the equipment is linked to the limit switch 28. When the limit switch 28 is not closed, the start button of the equipment cannot be started, thereby avoiding the heating compartment 2 from not being fully closed, resulting in excessive energy consumption.

[0070] By installing a control button group 31 on the front of the equipment compartment 1, the start and stop control of the equipment can be easily achieved.

[0071] Example 10:

[0072] In this embodiment, a smart repair coating containing nano-ceramic particles is applied to the inner wall of the combustion tube 3. This coating automatically repairs cracks at high temperatures, extending its lifespan. This is achieved by adding a microencapsulated repair agent (such as liquid silane) to the silicon carbide composite material, triggering a repair reaction at temperatures above 1200°C. This process is not detailed here.

[0073] By coating the inner wall of the combustion tube 3 with an intelligent repair coating containing nano-ceramic particles, the combustion tube 3 can be automatically repaired, which is beneficial to improving the service life of the combustion tube 3.

[0074] Example 11:

[0075] Sealing half rings are installed in the bottom chamber 4 and the upper cover 5. The two sealing half rings are combined into a sealing ring to clamp and seal the combustion tube 3, thereby sealing the connection between the combustion tube 3 and the heating chamber 2, thereby reducing heat escape.

[0076] The provision of a sealing half ring is beneficial for improving the sealing of the heating chamber 2, reducing heat escape, and thus reducing energy consumption.

[0077] It is worth mentioning that the temperature range of each combustion tube 3 can be designed according to needs, and the maximum temperature can be designed to be 1700°C, 1600°C, and 1500°C. The specific actual temperature range can be designed according to actual needs and will not be repeated here.

[0078] Working principle: When in use, different experimental samples can be added to multiple combustion tubes 3 respectively, and the control end 8 controls the electric heating rod 7 to heat each temperature zone so that the sample in each combustion tube 3 can reach the designed temperature. The temperature sensor 9 detects the temperature of each temperature zone and transmits the data to the control end 8. The control end 8 controls the start / stop of the electric heating rod 7 in a timely manner. Its control program can be designed according to the existing three-temperature zone tube furnace, which will not be repeated here, so that the temperature of each temperature zone reaches the heating temperature value of each combustion tube 3. If one of the electric heating rods 7 is damaged, the through hole 10 of the adjacent temperature zone (the temperature is higher than the side of the temperature zone) will be opened. The specific operation is as follows: control the electric push rod 12 to start, shorten its output shaft and drive the sealing plate 11 to descend, so that the through hole 10 is exposed, and the hot air in the adjacent temperature zone enters the current temperature zone through the through hole 10, realizing rapid heat exchange, replacing the damaged electric heating rod 7 in the current temperature zone, and realizing heating of the combustion tube 3 in the current temperature zone. The heating speed and temperature of the combustion tube 3 can be controlled by controlling the exposure size of the through hole 10. Thus, even if some of the electric heating rods 7 are damaged, the normal operation of the entire device will not be affected. This is beneficial to improving the stability of the device. It is worth noting that this method of use is only suitable for short-term replacement use and is not suitable for long-term use.

[0079] The present invention adopts a multi-tube structural design, which can complete the heating process of multiple samples in each combustion tube 3 at one time, thereby saving experimental time and improving experimental efficiency. The sample loading and subsequent use process in the combustion tube 3 can refer to the operating procedures of the existing tube furnace and will not be repeated here.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-zone temperature-controlled tubular furnace, characterized in that: include: Equipment chamber (1) and heating chamber (2); A plurality of heat insulation plates (6) are installed in the heating chamber (2), and the heating chamber (2) is divided into a plurality of temperature zones by the heat insulation plates (6); An independent heating source is provided in each temperature zone, and the independent heating source comprises an electric heating rod (7) installed in the heating chamber (2); a control terminal (8) is installed in the equipment chamber (1); the control terminal (8) is electrically connected to the electric heating rod (7) and is used to control the operation of the electric heating rod (7); A combustion tube (3) and a temperature sensor (9) are installed in each temperature zone; the combustion tube (3) is used to place a sample; the temperature sensor (9) is used to measure the temperature in each temperature zone, and the temperature sensor (9) is electrically connected to the control terminal (8); A through hole (10) is provided on the heat insulation plate (6), and a blocking mechanism is provided on one side of the heat insulation plate (6); the blocking mechanism includes a blocking plate (11); an electric push rod (12) is installed in the equipment compartment (1), and the electric push rod (12) is electrically connected to the control end (8); the electric push rod (12) is connected to the blocking plate (11) and is used to move the blocking plate (11), thereby controlling the closing and opening of the through hole (10).

2. The multi-zone temperature-controlled tubular furnace according to claim 1, characterized in that: A heat absorbing end (13) is installed in the heating chamber (2), a refrigeration device (14) is installed in the equipment chamber (1), and a heat releasing end (15) is installed outside the equipment chamber (1). The refrigeration device (14) is connected to the heat absorbing end (13) and the heat releasing end (15) respectively. The refrigeration device (14) is used to absorb heat in the heating chamber (2) through the heat absorbing end (13) and release heat through the heat releasing end (15).

3. The multi-zone temperature-controlled tubular furnace according to claim 1, characterized in that: The heating chamber (2) comprises a hinged bottom chamber (4) and an upper cover (5); the heat insulation board (6) is composed of two half-boards respectively installed in the bottom chamber (4) and the upper cover (5); A quick fixing mechanism (16) is installed on both sides of the bottom bin (4), and the quick fixing mechanism (16) includes a hinged first arc block (17) and a second arc block (18). The size of the circular ring formed by the first arc block (17) and the second arc block (18) after closing is adapted to the diameter of the combustion tube (3) and is used to fix the combustion tube (3); the first arc block (17) is fixedly connected to the bottom bin (4), and the first arc block (17) and the second arc block (18) are respectively provided with corresponding positioning grooves (20) and pin rods (19); and a pad block (21) is also installed on the first arc block (17).

4. The multi-zone temperature-controlled tubular furnace according to claim 1, characterized in that: The heating chamber (2) comprises a hinged bottom chamber (4) and an upper cover (5); a lock (27) and a travel switch (28) are installed on the bottom chamber (4); the travel switch (28) is used to close when the upper cover (5) is closed on the bottom chamber (4) and touches the travel switch (28); and the lock (27) is used to lock the upper cover (5) and the bottom chamber (4) when the travel switch (28) is closed.

5. The multi-zone temperature-controlled tubular furnace according to claim 1, characterized in that: An air inlet joint (22) and an air outlet joint (24) are respectively installed at both ends of the combustion tube (3); a pressure gauge (23) is installed on the air inlet joint (22), and a valve (25) is installed on the air outlet joint (24).

6. The multi-zone temperature-controlled tubular furnace according to claim 1, characterized in that: A honeycomb ceramic tail gas treatment pipe (26) is installed in the combustion tube (3).

7. The multi-zone temperature-controlled tubular furnace according to claim 1, characterized in that: The equipment compartment (1) is provided with an intelligent meter (29), a temperature adjustment button (30) and a control button group (31); the intelligent meter (29) is used to display the temperature of each temperature zone in the heating compartment (2) and the power of each electric heating rod (7); the temperature adjustment button (30) is used to set the target temperature value of the electric heating rod (7); the control button group (31) includes a main power button, a start button, a stop button and an emergency stop button.

8. The multi-zone temperature-controlled tubular furnace according to claim 1, characterized in that: The inner wall of the combustion tube (3) is coated with a repair coating containing nano-ceramic particles.

9. A multi-zone temperature-controlled tubular furnace according to any one of claims 1 to 8, characterized in that: The working process is as follows: Different or the same samples are added to each combustion tube (3), and the electric heating rod (7) in each temperature zone is controlled by the control end (8) to heat. The temperature sensor (9) measures the temperature in each temperature zone and transmits the temperature data to the control end (8) in real time. The control end (8) controls the operation of the electric heating rod (7) in real time according to the temperature data, so that the sample in each combustion tube (3) can reach the corresponding design temperature. If the electric heating rod (7) in a certain temperature zone fails, the through hole (10) on the heat insulation plate (6) separated from the adjacent temperature zone will be opened. The specific operation is as follows: the control end (8) controls the electric push rod (12) to start, the output shaft of the electric push rod (12) shortens and pulls the blocking plate (11) down, so that the through hole (10) is exposed, and the hot air in the adjacent temperature zone enters the temperature zone through the through hole (10); in this process, the control end (8) controls the operation of the electric heating rod (7) in the adjacent temperature zone in real time according to the temperature data.

10. The multi-zone temperature-controlled tubular furnace according to claim 9, characterized in that: Inert gas, reducing gas or mixed gas is introduced into the combustion tube (3); or the combustion tube (3) is vacuumed.

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