Tubular resistance furnace effective heating area testing device and testing method

Abstract

The invention discloses a device and method for testing an effective heating area of a tubular resistance furnace, and the device comprises a temperature measurement mechanism disposed in a tubular furnace and a positioning adjustment mechanism used for installing the temperature measurement mechanism, and one end of the tubular furnace is provided with a temperature control instrument extending into the tubular furnace. The positioning adjusting mechanism comprises a positioning block arranged at the other end of the tubular furnace and a rotating block embedded in the positioning block, a first temperature measuring tube is arranged on the positioning block, a second temperature measuring tube is arranged on the rotating block, and the temperature measuring mechanism comprises multi-section temperature sensors arranged in the first temperature measuring tube and the second temperature measuring tube in a penetrating manner; the method comprises the following steps: 1, installing a temperature measuring mechanism; 2, testing an effective heating area; and 3, determining a uniform temperature area of the tubular furnace. According to the invention, the multi-section temperature sensor is adopted for regional testing, so that the real-time temperature values of different positions in the tubular furnace can be conveniently tested at the same time, the uniformity of the temperature in the tubular furnace and the uniform temperature region can be conveniently determined by technicians, and the testing effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of tubular furnace testing, and in particular relates to a testing device and a testing method for an effective heating zone of a tubular resistance furnace. Background Art

[0002] Tubular resistance furnaces are important heating equipment for material performance analysis and heat treatment processes. They are widely used in research institutes, universities, and enterprise production lines. However, there are currently problems such as inconsistent calibration methods and lack of standard calibration methods. The accurate traceability of the temperature values ​​of tubular resistance furnaces cannot be guaranteed, which seriously affects the material quality control process and material performance analysis and testing.

[0003] The existing temperature field test technology of thermocouple calibration furnace is mainly used for the calibration of thermocouples. It has relatively high technical index requirements and is not suitable for the calibration of tubular resistance furnaces used in routine work. This method requires two standard thermocouples as standard instruments and measures the temperature field by manual dragging, which makes it impossible to accurately control the calibration position in the furnace, and has problems such as long calibration time, low efficiency, and high energy consumption. In addition, it requires the use of difficult-to-carry devices such as zero-degree thermostats and conversion switches, which is not convenient for on-site calibration. It is also impossible to measure the field temperature distribution of the entire temperature field at the same time, so the reflected temperature field is not true. In addition, the test temperature point is a fixed value of 1000 degrees Celsius, and the test temperature is relatively single, which is difficult to cover the temperature range of 300 to 1200 degrees Celsius designed for tubular resistance furnaces.

[0004] Therefore, there is a lack of a reasonably designed tubular furnace testing device to solve the problem that the effective heating zone of the tubular furnace is difficult to test. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a tubular resistance furnace effective heating zone testing device in view of the deficiencies in the above-mentioned prior art. By setting a temperature measuring mechanism, it is convenient to directly test the temperature inside the tubular furnace. By setting a multi-section temperature sensor, it is convenient to simultaneously test the real-time temperature values ​​at different positions in the tubular furnace, thereby facilitating the acquisition of real and effective test data and facilitating popularization and use.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a tube type resistance furnace effective heating zone testing device, characterized in that: it comprises a temperature measuring mechanism arranged in the tube type furnace and a positioning and adjusting mechanism for installing the temperature measuring mechanism, and one end of the tube type furnace is provided with a temperature control instrument extending into the interior of the tube type furnace;

[0007] The positioning and adjusting mechanism comprises a positioning block arranged at the other end of the tube furnace and a rotating block embedded in the positioning block, the positioning block is provided with a first temperature measuring tube, the rotating block is provided with a second temperature measuring tube, and the first temperature measuring tube and the second temperature measuring tube are both located in the tube furnace;

[0008] The temperature measuring mechanism includes a multi-section temperature sensor respectively inserted into the first temperature measuring tube and the second temperature measuring tube. One end of the multi-section temperature sensor extending from the positioning block and one end extending from the rotating block are both connected to compensation wires, and the compensation wires are connected to a data acquisition instrument.

[0009] The above-mentioned effective heating zone testing device for a tubular resistance furnace is characterized in that: the positioning block and the rotating block are both double-layer truncated cone structures, the positioning block is provided with a mounting hole for the rotating block to be embedded, the mounting hole is a circular stepped hole, and the small diameter end of the positioning block and the small diameter end of the rotating block are both close to the end of the tubular furnace.

[0010] The above-mentioned tubular resistance furnace effective heating zone testing device is characterized in that: the multi-section temperature sensor includes a five-section temperature sensor and a three-section temperature sensor, five thermocouples are evenly distributed on the five-section temperature sensor, and three thermocouples are evenly distributed on the three-section temperature sensor.

[0011] The above-mentioned effective heating zone testing device of a tubular resistance furnace is characterized in that the first temperature measuring tube and the second temperature measuring tube are arranged in a plum blossom shape in the tubular furnace.

[0012] At the same time, the present invention also discloses a method for testing the effective heating area of ​​a tubular resistance furnace, which has simple steps and convenient operation. A multi-segment temperature sensor is used to perform regional testing, which is convenient for technicians to determine the uniformity of the temperature in the tubular furnace, thereby determining the uniform temperature area of ​​the tubular furnace, and has a good test effect. The method is characterized in that the method comprises the following steps:

[0013] Step 1: Install the temperature measuring mechanism:

[0014] Step 101, installing the positioning and adjusting mechanism: inserting a temperature control instrument at one end of the tube furnace, then installing a positioning block at the other end of the tube furnace, and installing a rotating block on the positioning block, so that the first temperature measuring tube and the second temperature measuring tube extend into the tube furnace;

[0015] Step 102, determine the type of the multi-section temperature sensor: select a five-section temperature sensor or a three-section temperature sensor according to the length of the tube furnace, and then insert the five-section temperature sensor or the three-section temperature sensor into the first temperature measuring tube and the second temperature measuring tube respectively, and connect the data acquisition instrument and the five-section temperature sensor or the three-section temperature sensor through a compensation wire;

[0016] Step 2: Conduct effective heating zone test:

[0017] Step 201, preheating: setting the test temperature on the temperature control instrument, heating the tube furnace to the test temperature, and then keeping the temperature for 30 minutes, so that the temperature in the tube furnace reaches a thermally stable state;

[0018] Step 202, first temperature value collection: collect the temperature in the tube furnace through the five-segment temperature sensor and the three-segment temperature sensor, and then transmit the collected first set temperature value to the data acquisition instrument;

[0019] Step 203, second temperature value collection: after rotating the rotating block 180 degrees, the temperature in the tube furnace is collected again by the five-segment temperature sensor and the three-segment temperature sensor, and then the collected second set temperature value is transmitted to the data acquisition instrument;

[0020] Step 3: Determine the uniform temperature zone of the tube furnace:

[0021] Step 301, determine temperature uniformity: according to the formula Δθ + =max{t imax -t i0}, calculate the maximum value Δθ of furnace temperature uniformity in group i of tube furnaces + , and according to the formula Δθ-=min{t imin -t i0}, calculate the minimum value Δθ of furnace temperature uniformity in group i of tube furnaces - ;

[0022] Among them, t i0 is the temperature measurement value of the sensor at the geometric center of the measurement area collected for the i-th time, t imax The maximum temperature of each test point except the geometric center of the measurement area is collected for the i-th time, t imin The minimum temperature value of each test point except the geometric center of the measurement area is collected for the i-th time, and i is a positive integer;

[0023] Step 302, determine the temperature stability: according to the formula Δδ=max{t′ imax -t′ imin}, the temperature stability Δδ in the i-th group of tube furnaces is calculated;

[0024] Among them, t′ imax is the maximum temperature of each test point collected for the i-th time, t′ imin The minimum temperature value of each test point collected for the i-th time.

[0025] The above method is characterized in that: the data acquisition instrument acquires the first set temperature value and the second set temperature value for at least 15 minutes, and the acquisition frequency is once per minute;

[0026] In step 203, after rotating the rotating block, it is necessary to wait for 5 minutes until the temperature in the tube furnace reaches a thermally stable state before data collection is performed.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The present invention provides a positioning and adjusting mechanism to facilitate installation of the first temperature measuring tube and the second temperature measuring tube in the tubular furnace. The temperature measuring mechanism is provided to facilitate direct testing of the temperature in the tubular furnace. The multi-segment temperature sensor is provided to facilitate simultaneous testing of real-time temperature values ​​at different positions in the tubular furnace, thereby facilitating obtaining real and effective test data, achieving good test results, and having a small volume of the thermocouple. Multiple thermocouples are arranged in a straight line on the multi-segment temperature sensor to ensure accurate positioning and reliable measurement results.

[0029] 2. The present invention is convenient for collecting real-time temperature values ​​at different positions in the tube furnace by setting a data acquisition instrument, so that technicians can analyze each temperature value to determine the range of the effective heating zone of the tube furnace. The test effect is reliable and stable, and it is convenient for promotion and use.

[0030] 3. The method of the present invention has simple steps and is easy to operate. It uses a multi-segment temperature sensor to perform regional testing, which is convenient for performing effective heating zone testing on different positions inside the tube furnace. During the test, by rotating the rotating block, it is convenient to exchange the positions of the second temperature measuring tube located at the center and the second temperature measuring tube located at the edge, that is, the exchange method is used to reduce the system error. By calculating the temperature difference between the center and the edge of the tube furnace, the technician can determine the uniformity and stability of the temperature in the tube furnace, thereby determining the uniform temperature zone of the tube furnace, which is convenient for promotion and use.

[0031] 4. The present invention can also divide the temperature field in the tube furnace into multiple intervals such as front, middle and rear by setting a multi-section temperature sensor, and collect the real-time temperature values ​​in different intervals under the rated temperature setting, so as to more accurately determine the real-time temperature of the different intervals such as front, middle and rear inside the tube furnace during actual use, thereby facilitating the technicians to place the test materials in the required temperature interval and reducing the errors of subsequent operations.

[0032] In summary, the effective heating zone testing device of the tubular resistance furnace adopted in the present invention is convenient for directly testing the temperature in the tubular furnace by setting a temperature measuring mechanism, and is convenient for simultaneously testing the real-time temperature values ​​of different positions in the tubular furnace by setting a multi-segment temperature sensor, thereby facilitating obtaining real and effective test data; the adopted testing method has simple steps and convenient operation, and adopts a multi-segment temperature sensor to perform regional testing, which is convenient for technicians to determine the uniformity of the temperature in the tubular furnace, thereby determining the uniform temperature zone of the tubular furnace, and the testing effect is good.

[0033] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention.

[0035] Figure 2 It is a structural schematic diagram of the positioning block of the present invention.

[0036] Figure 3 It is a structural schematic diagram of the rotating block of the present invention.

[0037] Figure 4 It is a schematic diagram of the combination relationship between the positioning block and the rotating block of the present invention.

[0038] Figure 5 The figure is a flowchart of the method of the present invention.

[0039] Description of reference numerals:

[0040] 1—Tube furnace; 2—Temperature control instrument; 3—Positioning block;

[0041] 4—first temperature measuring tube; 5—mounting hole; 6—rotating block;

[0042] 7—second temperature measuring tube; 8—five-section temperature sensor; 9—three-section temperature sensor;

[0043] 10—thermocouple; 11—compensation wire; 12—data acquisition instrument. DETAILED DESCRIPTION

[0044] like Figures 1 to 4 As shown, a tubular resistance furnace effective heating zone testing device of the present invention comprises a temperature measuring mechanism arranged in the tubular furnace 1 and a positioning and adjusting mechanism for installing the temperature measuring mechanism, and a temperature control instrument 2 extending into the interior of the tubular furnace 1 is arranged at one end of the tubular furnace 1.

[0045] The positioning and adjustment mechanism includes a positioning block 3 arranged at the other end of the tube furnace 1 and a rotating block 6 embedded in the positioning block 3, the positioning block 3 is provided with a first temperature measuring tube 4, and the rotating block 6 is provided with a second temperature measuring tube 7, and the first temperature measuring tube 4 and the second temperature measuring tube 7 are both located in the tube furnace 1.

[0046] The temperature measuring mechanism includes a multi-section temperature sensor respectively inserted into the first temperature measuring tube 4 and the second temperature measuring tube 7. One end of the multi-section temperature sensor extending from the positioning block 3 and one end extending from the rotating block 6 are connected to a compensation wire 11, and the compensation wire 11 is connected to a data acquisition instrument 12.

[0047] When the present invention is used, by setting a positioning adjustment mechanism, it is convenient to install the first temperature measuring tube 4 and the second temperature measuring tube 7 in the tubular furnace 1; by setting a temperature measuring mechanism, it is convenient to directly test the temperature in the tubular furnace 1; by setting a multi-section temperature sensor, it is convenient to test the real-time temperature values ​​of different positions in the tubular furnace 1 at the same time, which is conducive to obtaining real and effective test data and having a good test effect; by setting a data acquisition instrument 12, it is convenient to collect the real-time temperature values ​​of different positions in the tubular furnace 1 respectively, so that it is convenient for technicians to derive the range of the effective heating zone of the tubular furnace 1 by analyzing each temperature value, and the test effect is reliable and stable.

[0048] like Figure 2 and Figure 3 As shown, in this embodiment, the positioning block 3 and the rotating block 6 are both double-layer truncated cone structures, and the positioning block 3 is provided with a mounting hole 5 for the rotating block 6 to be embedded, and the mounting hole 5 is a circular stepped hole, and the small diameter end of the positioning block 3 and the small diameter end of the rotating block 6 are both close to the end of the tube furnace 1.

[0049] The double-layer truncated cone structure in the present invention includes two first cylinders with different diameters, the first small-diameter cylinder is connected to the first temperature measuring tube 4, and the first large-diameter cylinder is located on the side of the first small-diameter cylinder away from the first temperature measuring tube 4; the rotating block 6 includes two second cylinders with different diameters, the second small-diameter cylinder is connected to the second temperature measuring tube 7, and the second large-diameter cylinder is located on the side of the second small-diameter cylinder away from the second temperature measuring tube 7; the interior of the positioning block 3 is provided with a mounting hole 5 adapted to the outer diameter of the rotating block 6, so that the rotating block 6 can be embedded in the positioning block 3, so that the rotating block 6 can both realize self-rotation in the positioning block 3 and prevent the rotating block 6 from falling from the positioning block 3 into the tubular furnace 1 during rotation.

[0050] In this embodiment, the multi-segment temperature sensor includes a five-segment temperature sensor 8 and a three-segment temperature sensor 9 . Five thermocouples 10 are evenly distributed on the five-segment temperature sensor 8 , and three thermocouples 10 are evenly distributed on the three-segment temperature sensor 9 .

[0051] In actual use, by setting a five-section temperature sensor 8 and a three-section temperature sensor 9, it is convenient to simultaneously collect the temperatures at multiple points within the length range, and the five-section temperature sensor 8 and the three-section temperature sensor 9 are respectively inserted into the first temperature measuring tube 4 and the second temperature measuring tube 7, so that the first temperature measuring tube 4 and the second temperature measuring tube 7 can collect real-time temperature values ​​at different points, so that it is convenient for technicians to accurately judge the uniform temperature zone of the tube furnace 1 according to the positions of the first temperature measuring tube 4 and the second temperature measuring tube 7 in the tube furnace 1. The volume of the thermocouple is small, and a plurality of thermocouples are arranged in a straight line on the multi-section temperature sensor, so that the positioning is accurate and the measurement result is reliable.

[0052] It should be noted that the multiple thermocouples 10 are evenly arranged along the length direction from the ends to the middle of the five-segment temperature sensor 8 and the three-segment temperature sensor 9 .

[0053] In this embodiment, the first temperature measuring tube 4 and the second temperature measuring tube 7 are arranged in a plum blossom shape in the tubular furnace 1 .

[0054] like Figure 4 As shown, the number of first temperature measuring tubes 4 is at least three, and the number of second temperature measuring tubes 7 is at least two; in the initial state, one of the second temperature measuring tubes 7 is located at the center of the positioning block 3, and the other second temperature measuring tube 7 and the three first temperature measuring tubes 4 are circumferentially arranged on the positioning block 3, so as to facilitate more comprehensive detection of the real-time temperature values ​​at various positions in the tubular furnace 1.

[0055] like Figure 5 A method for testing the effective heating area of ​​a tubular resistance furnace is shown, comprising the following steps:

[0056] Step 1: Install the temperature measuring mechanism:

[0057] Step 101, install the positioning and adjusting mechanism: insert the temperature control instrument 2 at one end of the tube furnace 1, then install the positioning block 3 at the other end of the tube furnace 1, and install the rotating block 6 on the positioning block 3, so that the first temperature measuring tube 4 and the second temperature measuring tube 7 extend into the tube furnace 1.

[0058] Step 102, determine the type of the multi-section temperature sensor: select a five-section temperature sensor 8 or a three-section temperature sensor 9 according to the length of the tube furnace 1, and then insert the five-section temperature sensor 8 or the three-section temperature sensor 9 into the first temperature measuring tube 4 and the second temperature measuring tube 7 respectively, and connect the data acquisition instrument 12 with the five-section temperature sensor 8 or the three-section temperature sensor 9 through the compensation wire 11.

[0059] Step 2: Conduct effective heating zone test:

[0060] Step 201, preheating: set the test temperature on the temperature control instrument 2, start heating the tube furnace 1 to the test temperature, and then keep the temperature for 30 minutes, so that the temperature in the tube furnace 1 reaches a thermally stable state.

[0061] Step 202 , first temperature value collection: the temperature in the tube furnace 1 is collected by the five-segment temperature sensor 8 and the three-segment temperature sensor 9 , and then the collected first collective temperature value is transmitted to the data acquisition instrument 12 .

[0062] Step 203 , second temperature value collection: after rotating the rotating block 6 by 180 degrees, the temperature in the tube furnace 1 is collected again by the five-segment temperature sensor 8 and the three-segment temperature sensor 9 , and then the collected second set temperature value is transmitted to the data acquisition instrument 12 .

[0063] In actual tests, after rotating the rotating block 6, it is necessary to wait for 5 minutes until the temperature in the tube furnace 1 reaches a thermally stable state before data collection is performed; and in the initial state, any second temperature measuring tube 7 on the rotating block 6 is located at the center of the positioning block 3, and after rotating 180 degrees, the other second temperature measuring tube 7 on the rotating block 6 is located at the center of the positioning block 3. By rotating the rotating block 6 180 degrees, it is convenient to exchange the positions of the second temperature measuring tube 7 located at the center and the second temperature measuring tube 7 located at the edge, that is, the exchange method is used to reduce the system error.

[0064] Step 3: Determine the uniform temperature zone of the tube furnace:

[0065] Step 301, determine temperature uniformity: according to the formula Δθ + =max{t imax -t i0}, the maximum value of furnace temperature uniformity Δθ ​​in tube furnace 1 is calculated + , and according to the formula Δθ - =min{t imin -t i0}, calculate the minimum value Δθ of furnace temperature uniformity in tube furnace 1 - .

[0066] Among them, t i0 is the temperature measurement value of the sensor at the geometric center of the measurement area collected for the i-th time, t imax The maximum temperature of each test point except the geometric center of the measurement area is collected for the i-th time, t imin The minimum temperature value of each test point except the geometric center of the measurement area is collected for the i-th time.

[0067] Step 302, determine the temperature stability: according to the formula Δδ=max{t′ imax -t′ imin}, the temperature stability Δδ in the tube furnace 1 is calculated; where t′ imax is the maximum temperature of each test point collected for the i-th time, t′ imin The minimum temperature value of each test point collected for the i-th time.

[0068] In this embodiment, the data acquisition instrument 12 collects the first set of temperature values ​​and the second set of temperature values ​​for at least 15 minutes, and the collection frequency is once per minute; that is, the first set of temperature values ​​and the second set of temperature values ​​each include at least 15 groups of temperature values, and each group of temperature values ​​includes the real-time temperature values ​​collected by each thermocouple 10, which are used for the calculation of step three.

[0069] In actual use, when a five-section temperature sensor 8 is inserted into the first temperature measuring tube 4 and a three-section temperature sensor 9 is inserted into the second temperature measuring tube 7, the number of the five-section temperature sensors 8 is at least two, and the number of the three-section temperature sensors 9 is at least three, then each group of temperature values ​​includes at least 19 temperature values; when the three-section temperature sensor 9 is inserted into both the first temperature measuring tube 4 and the second temperature measuring tube 7, the number of the three-section temperature sensors 9 is at least five, then each group of temperature values ​​includes at least 15 temperature values; when the five-section temperature sensor 8 is inserted into both the first temperature measuring tube 4 and the second temperature measuring tube 7, the number of the five-section temperature sensor 8 is at least five, then each group of temperature values ​​includes at least 25 temperature values.

[0070] In actual use, the temperature values ​​of the upper, lower, left and right positions in the tube furnace 1 are collected by a multi-segment temperature sensor, and the maximum temperature value, the minimum temperature value, and the temperature value at the geometric center collected by the multi-segment temperature sensor every minute are recorded to calculate the instantaneous temperature uniformity of the tube furnace 1 at that moment. The maximum and minimum values ​​of the instantaneous temperature uniformity of the tube furnace 1 within 30 minutes are taken to calculate the temperature uniformity of the tube furnace 1.

[0071] The present invention adopts a multi-section temperature sensor to perform regional testing, which is convenient for performing effective heating zone testing on different positions inside the tube furnace 1. During the test, by rotating the rotating block 6, the multi-section temperature sensor can collect the temperature inside the tube furnace 1 circumferentially. By calculating the temperature difference between the center and the edge of the tube furnace 1, the technician can determine the uniformity and stability of the temperature inside the tube furnace 1, thereby accurately and quickly determining the uniform temperature zone of the tube furnace 1.

[0072] At the same time, the present invention can also divide the temperature field in the tube furnace 1 into multiple intervals such as front, middle and rear by setting a multi-section temperature sensor, and respectively collect the real-time temperature values ​​in different intervals under the rated temperature setting, so as to more accurately determine the real-time temperature of the different intervals such as front, middle and rear inside the tube furnace 1 when it is actually used, and then facilitate the technicians to place the test materials in the required temperature interval later, so as to reduce the errors of subsequent operations.

[0073] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A tubular resistance furnace effective heating zone testing device, characterized in that: It comprises a temperature measuring mechanism arranged in a tube furnace (1) and a positioning and adjusting mechanism for installing the temperature measuring mechanism, wherein one end of the tube furnace (1) is provided with a temperature control instrument (2) extending into the interior of the tube furnace (1); The positioning and adjusting mechanism comprises a positioning block (3) arranged at the other end of the tube furnace (1) and a rotating block (6) embedded in the positioning block (3); a first temperature measuring tube (4) is arranged on the positioning block (3); a second temperature measuring tube (7) is arranged on the rotating block (6); and both the first temperature measuring tube (4) and the second temperature measuring tube (7) are located in the tube furnace (1); The temperature measuring mechanism comprises a multi-section temperature sensor respectively inserted into the first temperature measuring tube (4) and the second temperature measuring tube (7); one end of the multi-section temperature sensor extending out of the positioning block (3) and one end extending out of the rotating block (6) are both connected to a compensation wire (11); the compensation wire (11) is connected to a data acquisition instrument (12).

2. A tubular resistance furnace effective heating zone testing device according to claim 1, characterized in that: The positioning block (3) and the rotating block (6) are both double-layer truncated cone structures. The positioning block (3) is provided with a mounting hole (5) for the rotating block (6) to be embedded. The mounting hole (5) is a circular stepped hole. The small-diameter end of the positioning block (3) and the small-diameter end of the rotating block (6) are both located at the end close to the tube furnace (1).

3. A tubular resistance furnace effective heating zone testing device according to claim 1, characterized in that: The multi-segment temperature sensor comprises a five-segment temperature sensor (8) and a three-segment temperature sensor (9); five thermocouples (10) are evenly arranged on the five-segment temperature sensor (8); and three thermocouples (10) are evenly arranged on the three-segment temperature sensor (9).

4. A tubular resistance furnace effective heating zone testing device according to claim 1, characterized in that: The first temperature measuring tube (4) and the second temperature measuring tube (7) are arranged in a plum blossom shape in the tubular furnace (1).

5. A method for testing the effective heating area of ​​a tubular resistance furnace using the effective heating area testing device of a tubular resistance furnace as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Install the temperature measuring mechanism: Step 101, installing the positioning and adjusting mechanism: inserting a temperature control instrument (2) at one end of the tube furnace (1), then installing a positioning block (3) at the other end of the tube furnace (1), and installing a rotating block (6) on the positioning block (3), so that the first temperature measuring tube (4) and the second temperature measuring tube (7) extend into the tube furnace (1); Step 102, determining the type of the multi-section temperature sensor: selecting a five-section temperature sensor (8) or a three-section temperature sensor (9) according to the length of the tube furnace (1), then inserting the five-section temperature sensor (8) or the three-section temperature sensor (9) into the first temperature measuring tube (4) and the second temperature measuring tube (7), respectively, and connecting the data acquisition instrument (12) and the five-section temperature sensor (8) or the three-section temperature sensor (9) via a compensation wire (11); Step 2: Conduct effective heating zone test: Step 201, preheating: setting a test temperature on the temperature control instrument (2), causing the temperature in the tube furnace (1) to rise to the test temperature, and then maintaining the temperature for 30 minutes, so that the temperature in the tube furnace (1) reaches a thermally stable state; Step 202, first temperature value collection: the temperature in the tube furnace (1) is collected by a five-segment temperature sensor (8) and a three-segment temperature sensor (9), and then the collected first set temperature value is transmitted to a data acquisition instrument (12); Step 203, second temperature value collection: after rotating the rotating block (6) by 180 degrees, the temperature in the tube furnace (1) is collected again by the five-segment temperature sensor (8) and the three-segment temperature sensor (9), and then the collected second set temperature value is transmitted to the data acquisition instrument (12); Step 3: Determine the uniform temperature zone of the tube furnace: Step 301, determine temperature uniformity: according to the formula Δθ + =max{t imax -t i0 }, calculate the maximum value Δθ of furnace temperature uniformity in group i of tube furnaces (1) + , and according to the formula Δθ - =min{t imin -t i0 }, calculate the minimum value Δθ of furnace temperature uniformity in group i of tube furnaces (1) - ; Among them, t i0 is the temperature measurement value of the sensor at the geometric center of the measurement area collected for the i-th time, t imax The maximum temperature of each test point except the geometric center of the measurement area is collected for the i-th time, t imin The minimum temperature value of each test point except the geometric center of the measurement area is collected for the i-th time, and i is a positive integer; Step 302: Determine the temperature stability: According to the formula Δδ=max{t' imax -t' imin }, calculate the temperature stability Δδ in the i-th group of tube furnaces (1); Among them, t' imax is the maximum temperature of each test point collected for the i-th time, t' imin The minimum temperature value of each test point collected for the i-th time.

6. The method according to claim 5, characterized in that: The data acquisition device (12) acquires the first set temperature value and the second set temperature value for at least 15 minutes, and the acquisition frequency is once per minute; In step 203, after rotating the rotating block (6), it is necessary to wait for 5 minutes until the temperature in the tube furnace (1) reaches a thermally stable state before data collection is performed.

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