Heating tube sorting method for diamond synthesis and heating tube resistance measurement method
By measuring the resistance multiple times at the end of the heating tube and taking the average value, the problem of inaccurate resistance measurement in the prior art is solved, and the current stability and yield improvement in diamond synthesis process is achieved.
Patent Information
- Application Number
- CN202210345534.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-03-31
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2042-03-31
AI Technical Summary
The prior art cannot accurately measure the resistance of the heating tube, resulting in poor product stability and low yield during diamond synthesis.
By measuring the resistance multiple times at different positions at the end of the heating tube and taking the average value, the uniformly arranged conductors are connected to the resistance measuring device, and accurate measurement and sorting are used for the DC resistance measuring instrument.
It improves the accuracy of the resistance measurement of heating tubes, ensures that the current changes are small and the sintering temperature is consistent during the synthesis process, and improves the performance stability and yield of diamond products.
Smart Images
Figure CN114740053B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of resistance measurement, and in particular relates to a method for sorting heating tubes for diamond synthesis and a method for measuring the resistance of the heating tubes. Background Art
[0002] In the synthesis process of the six-sided top press, the heating tube, as the main heating element, is an important heat source in the high temperature and high pressure conditions necessary for the production of artificial diamonds and polycrystalline diamond composites (PDC). Whether the heating tube heats evenly and stably directly determines the quality of the synthesized product.
[0003] Since multiple heating tubes are required in each synthesis process, the more stable the resistance of multiple heating tubes of the same specification in the same batch of synthetic products, the smaller the current change of the six-sided top press during the synthesis process, and the smaller the difference in sintering temperature between different blocks of products, the more beneficial it is to the performance stability and consistency of the synthetic products.
[0004] However, since the heating tube is a tubular structure, it is not easy to accurately measure the resistance of the heating tube with the prior art. In actual production, the heating tubes are usually sorted by weight when used. Specifically, under the same specifications, they are first sorted by weight in the same batch or between different batches, and then used in the same weight range. However, the heating tubes sorted in this way still have problems such as poor resistance stability, poor product stability, and low yield when applied to the production process of synthetic products. Summary of the invention
[0005] The purpose of the present invention is to provide a method for sorting heating tubes for diamond synthesis to solve the problems of poor product stability and low yield rate when using heating tubes to synthesize diamonds in the prior art, and also to provide a method for measuring the resistance of heating tubes to solve the problem of poor product stability and low yield rate when using heating tubes to synthesize diamonds due to the inability of the prior art to accurately measure the resistance of heating tubes.
[0006] The technical solution of the diamond synthesis heating tube sorting method of the present invention is:
[0007] 1) The two ends of the heating tube are defined as a first end and a second end respectively, and n first end wire conduction positions are selected at the first end of the heating tube, and the n first end wire conduction positions are distributed in the circumferential direction of the first end of the heating tube, wherein n is not less than 3, and the n first end wire conduction positions are respectively first end wire conduction position a1, first end wire conduction position a2, ..., first end wire conduction position a n, select n second end wire conduction positions corresponding to the first end wire conduction positions on the second end of the heating tube, the n second end wire conduction positions are distributed in the circumferential direction of the second end of the heating tube, and the n second end wire conduction positions are respectively second end wire conduction position b1, second end wire conduction position b2...second end wire conduction position b n The first end wire conduction position and the second end wire conduction position are used to conduct with the resistance measuring device, and the first end wire conduction position and the second end wire conduction position corresponding to each other are located on a straight line extending along the axial direction of the heating tube;
[0008] 2) The positive and negative wires of the resistance measuring device are respectively connected at the first wire conducting position a1 and the second wire conducting position b1 corresponding to the first wire conducting position a1, and the resistance of the heating tube is measured to be R1; the positive and negative wires of the resistance measuring device are respectively connected at the first wire conducting position a2 and the second wire conducting position b2 corresponding to the first wire conducting position a2, and the resistance of the heating tube is measured to be R2; n and the first end wire conduction position a n The corresponding second end wire conduction position b n The positive and negative wires of the resistance measuring device are connected to each other, and the resistance of the heating tube is measured to be R n ;
[0009] 3) Calculate the resistance of the heating tube R0 = (R1 + R2 + ... R n ) / n;
[0010] 4) Sort the heating tubes according to their resistance.
[0011] The technical effect of the present invention is as follows: since the resistance of the heating tube is measured multiple times at different positions of the end of the heating tube and the average value of the measurement results is taken as the final resistance of the heating tube, the measured resistance of each heating tube is relatively accurate. After the heating tubes are sorted according to their resistances, the heating tubes with relatively close resistances are used in the synthesis process of the same batch of diamond products. Since the resistance difference between the heating tubes is small, the current change of the six-sided top press is small during the synthesis process, and the difference between the sintering temperatures of different blocks of products is small, so that the performance stability and consistency of the synthesized diamond products are better, thereby improving the stability in the synthesis process and the yield of the synthesized products.
[0012] Furthermore, the first-end wire conducting positions are evenly arranged in the circumferential direction of the first end of the heating tube, and the second-end wire conducting positions are evenly arranged in the circumferential direction of the second end of the heating tube.
[0013] The beneficial effect is that the conducting positions of the wires are evenly arranged in the circumferential direction of the end of the heating tube, so that the distribution of the measuring positions is more reasonable and the measuring accuracy is higher.
[0014] Further, n is equal to 3.
[0015] The beneficial effect is that only three measurement positions are selected on each end, which is a small number and is conducive to improving measurement efficiency.
[0016] Furthermore, the resistance measuring device clamps the heating tube through a conductive clamp to achieve conductive connection with the heating tube.
[0017] The beneficial effect is that the conductive clip is used to connect the wire of the resistance measuring device to the heating tube, so it is convenient and quick to take and put the wire, which is conducive to improving the measurement efficiency.
[0018] Furthermore, the resistance measuring device is a DC resistance measuring instrument.
[0019] The beneficial effects are: the DC resistance measuring instrument is easy to use and has low cost.
[0020] The technical solution of the heating tube resistance measurement method of the present invention is:
[0021] 1) The two ends of the heating tube are defined as a first end and a second end respectively, and n first end wire conduction positions are selected at the first end of the heating tube, and the n first end wire conduction positions are distributed in the circumferential direction of the first end of the heating tube, wherein n is not less than 3, and the n first end wire conduction positions are respectively first end wire conduction position a1, first end wire conduction position a2, ..., first end wire conduction position a n , select n second end wire conduction positions corresponding to the first end wire conduction positions on the second end of the heating tube, the n second end wire conduction positions are distributed in the circumferential direction of the second end of the heating tube, and the n second end wire conduction positions are respectively second end wire conduction position b1, second end wire conduction position b2...second end wire conduction position b n The first end wire conduction position and the second end wire conduction position are used to conduct with the resistance measuring device, and the first end wire conduction position and the second end wire conduction position corresponding to each other are located on a straight line extending along the axial direction of the heating tube;
[0022] 2) The positive and negative wires of the resistance measuring device are respectively connected at the first wire conducting position a1 and the second wire conducting position b1 corresponding to the first wire conducting position a1, and the resistance of the heating tube is measured to be R1; the positive and negative wires of the resistance measuring device are respectively connected at the first wire conducting position a2 and the second wire conducting position b2 corresponding to the first wire conducting position a2, and the resistance of the heating tube is measured to be R2; n and the first end wire conduction position a nThe corresponding second end wire conduction position b n The positive and negative wires of the resistance measuring device are connected to each other, and the resistance of the heating tube is measured to be R n ;
[0023] 3) Calculate the resistance of the heating tube R0 = (R1 + R2 + ... R n ) / n;
[0024] The technical effect of the present invention is that: since the resistance of the heating tube is measured multiple times at different positions of the end of the heating tube and the average value of the measurement results is taken as the final resistance of the heating tube, the measured resistance of each heating tube is relatively accurate, and the heating tubes can be sorted according to the resistance of the heating tubes when they are used, so that the same batch of diamond products use heating tubes with relatively close resistances during the synthesis process. Since the resistance difference between the heating tubes is small, the current change of the six-sided top press during the synthesis process is small, and the difference between the sintering temperatures of different blocks of products is small, so that the performance stability and consistency of the synthesized diamond products are better, thereby improving the stability of the synthesis process and the yield of the synthesized products.
[0025] Furthermore, the first-end wire conducting positions are evenly arranged in the circumferential direction of the first end of the heating tube, and the second-end wire conducting positions are evenly arranged in the circumferential direction of the second end of the heating tube.
[0026] The beneficial effect is that the conducting positions of the wires are evenly arranged in the circumferential direction of the end of the heating tube, so that the distribution of the measuring positions is more reasonable and the measuring accuracy is higher.
[0027] Further, n is equal to 3.
[0028] The beneficial effect is that only three measurement positions are selected on each end, which is a small number and is conducive to improving measurement efficiency.
[0029] Furthermore, the resistance measuring device clamps the heating tube through a conductive clamp to achieve conductive connection with the heating tube.
[0030] The beneficial effect is that the conductive clip is used to connect the wire of the resistance measuring device to the heating tube, so it is convenient and quick to take and put the wire, which is conducive to improving the measurement efficiency.
[0031] Furthermore, the resistance measuring device is a DC resistance measuring instrument.
[0032] The beneficial effects are: the DC resistance measuring instrument is easy to use and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a structural schematic diagram of a DC low resistance measuring instrument;
[0034] Figure 2 for Figure 1 The figure in the figure is the measurement principle diagram of the DC low resistance measuring instrument;
[0035] Figure 3 A schematic diagram of the distribution of the first end wire conducting position on the first end of the carbon tube;
[0036] Figure 4 A schematic diagram of the distribution of the second end wire conducting position on the second end surface of the carbon tube;
[0037] Figure 5 for Figure 1 Schematic diagram of the state of the DC low resistance measuring instrument when measuring carbon tubes;
[0038] In the figure: 1. display panel; 2. resistance measuring instrument host; 3. button area; 4. crocodile clip; 5. wire; 51. current wire; 52. voltage wire; 6. host bracket; 7. carbon tube; 71. first conduction position; 72. second conduction position; 73. third conduction position; 74. fourth conduction position; 75. fifth conduction position; 76. sixth conduction position. DETAILED DESCRIPTION
[0039] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.
[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.
[0041] It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, elements defined by the sentence "including a...", etc., do not exclude the process or method that includes the elements.
[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.
[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0044] The present invention is described in further detail below in conjunction with embodiments.
[0045] Specific embodiment 1 of the method for sorting heating tubes for diamond synthesis provided by the present invention:
[0046] In this embodiment, the heating tube is specifically a carbon tube 7. In other embodiments, the heating tube may be a steel tube or a copper tube. A DC low resistance meter is selected as a resistance measuring device to measure the resistance of the carbon tube. The DC low resistance meter has high measurement accuracy, which can reach 0.001 mΩ, and can accurately measure the resistance of the carbon tube.
[0047] like Figure 1As shown, the DC low resistance measuring instrument includes a display panel 1, a resistance measuring instrument host 2, an operation button area 3, an alligator clip 4, a wire 5 and a host bracket 6, wherein the display panel 1 is used to display the measured resistance value, the resistance measuring instrument host 2 is used to process data and provide DC power for measuring resistance, and by operating the operation button area 3, the DC low resistance measuring instrument can be operated to measure the gear and calibrate, as shown in FIG. Figure 2 As shown, the internal resistance measurement principle of the DC low resistance meter is to measure the resistance using the Kelvin four-wire measurement method. Two groups of measuring wires 5 extend from the DC low resistance meter, one group is a positive wire, and the other group is a negative wire. Each group of measuring wires 5 includes two wires, namely a current wire 51 and a voltage wire 52. The end of each group of wires is connected with an alligator clip 4 as a conductive clip. The alligator clip 4 is used to clamp the two ends of the carbon tube 7 to measure the resistance.
[0048] During measurement, the two current wires 51 measure the current passing through the carbon tube 7 , and the two voltage wires 52 measure the voltage drop across the carbon tube 7 . Finally, the resistance value of the carbon tube is calculated by R=U / I.
[0049] The diamond synthesis heating tube sorting method of the present invention includes a heating tube resistance measurement method, and the heating tube resistance measurement method includes the following steps:
[0050] (1) The two ends of the carbon tube 7 are defined as the first end and the second end, respectively. In the circumferential direction of the first end of the carbon tube 7, n first end wire conduction positions are evenly distributed, and in the circumferential direction of the second end, n second end wire conduction positions are evenly distributed. In this embodiment, n is equal to 3. The first end wire conduction positions and the second end wire conduction positions correspond to each other one by one. The six wire conduction positions are respectively the first end wire conduction position a1, the first end wire conduction position a2, the first end wire conduction position a3, the second end wire conduction position b1, the second end wire conduction position b2, and the second end wire conduction position b3. Figure 3 , Figure 4 and Figure 5 As shown, the first end wire conduction position a1 is defined as the first conduction position 71, the first end wire conduction position a2 is defined as the second conduction position 72, the first end wire conduction position a3 is defined as the third conduction position 73, the second end wire conduction position b1 is defined as the fourth conduction position 74, the second end wire conduction position b2 is defined as the fifth conduction position 75, and the second end wire conduction position b3 is defined as the sixth conduction position 76. Figure 3 The figure shows the distribution of the conductive position of the first end wire in the circumferential direction of the first end. Figure 4The diagram shows the distribution of the second end wire conduction positions in the circumferential direction of the second end, wherein the first conduction position 71 corresponds to the fourth conduction position 74, the second conduction position 72 corresponds to the fifth conduction position 75, the third conduction position 73 corresponds to the sixth conduction position 76, and the corresponding first end wire conduction positions and second end wire conduction positions are located on a straight line extending along the axial direction of the carbon tube 7;
[0051] (2) Figure 5 As shown, two crocodile clips 4 are used to clamp the first conduction position 71 and the fourth conduction position 74 corresponding to each other at both ends of the carbon tube 7, and after the display panel 1 of the DC resistance measuring instrument stably displays the resistance, the resistance of the carbon tube 7 measured this time is read out and recorded as R1;
[0052] Then, the carbon tube 7 is rotated 120°, and the two crocodile clips 4 are respectively clamped at the second conduction position 72 and the fifth conduction position 75 corresponding to each other at both ends of the carbon tube 7. After the display panel 1 of the DC resistance measuring instrument stably displays the resistance, the resistance of the carbon tube 7 measured this time is read and recorded as R2;
[0053] Finally, the carbon tube 7 is rotated 120° again, and the two crocodile clips 4 are respectively clamped at the third conduction position 73 and the sixth conduction position 76 corresponding to both ends of the carbon tube 7. After the display panel 1 of the DC resistance measuring instrument stably displays the resistance, the resistance of the carbon tube 7 measured this time is read and recorded as R3;
[0054] (3) The final carbon tube resistance R0 = (R1 + R2 + R3) / 3.
[0055] After the resistance of a plurality of carbon tubes is continuously measured by the above-mentioned heating tube resistance measurement method, the carbon tubes are sorted for use according to the resistance values of the measured carbon tubes and the width of an interval of 0.2 mΩ.
[0056] Since the resistance of the carbon tube is measured multiple times at different positions of the end of the carbon tube and the average value of the measurement results is taken as the final resistance of the carbon tube, the measured resistance of each carbon tube is relatively accurate. After the carbon tubes with different resistance values are sorted according to the resistance values of the carbon tubes, the carbon tubes in the same resistance range are used in the synthesis process of the same batch of diamond products. Since the resistance value difference of the carbon tubes in the same resistance range is small, the current change of the six-sided top press is small during the synthesis process, and the difference between the sintering temperatures of different pieces of products is small, so that the performance stability and consistency of the synthesized diamond products are better, thereby improving the stability of the synthesis process and the yield of the synthesized products.
[0057] Specific embodiment 2 of the method for sorting heating tubes for diamond synthesis provided by the present invention:
[0058] In Example 1, the resistance measuring device is a DC resistance measuring instrument. In this embodiment, different from Example 1, the resistance measuring device is an ohmmeter.
[0059] Specific embodiment 3 of the method for sorting heating tubes for diamond synthesis provided by the present invention:
[0060] In Example 1, there are 3 wire conduction positions at each end of the carbon tube to be measured. After the measurement at one wire conduction position is completed, the carbon tube is rotated 120° to perform measurement at another wire conduction position. In this embodiment, different from Example 1, for carbon tubes with larger inner and outer diameters, there are 4 wire conduction positions at each end of the carbon tube. After the measurement at one wire conduction position is completed, the carbon tube is rotated 90° to perform measurement at another wire conduction position.
[0061] Specific embodiment 4 of the method for sorting heating tubes for diamond synthesis provided by the present invention:
[0062] In Example 1, the three first-end wire conducting positions are evenly arranged in the circumferential direction of the first end. In this embodiment, different from Example 1, the three first-end wire conducting positions are unevenly arranged in the circumferential direction of the first end, and after the first measurement is completed, the carbon tube is rotated 100° for the second measurement, and then the carbon tube is rotated 120° for the third measurement.
[0063] Specific embodiment 5 of the method for sorting heating tubes for diamond synthesis provided by the present invention:
[0064] In Example 1, the end of the wire is connected with an alligator clip, which is clamped on the carbon tube to connect the wire to the carbon tube. In this embodiment, different from Example 1, the measuring wire is fixed on the carbon tube by conductive glue to connect the wire to the carbon tube.
[0065] Specific embodiment 6 of the method for sorting heating tubes for diamond synthesis provided by the present invention:
[0066] In Example 1, the end of the wire is connected with an alligator clip, and the alligator clip is clamped on the carbon tube to connect the wire to the carbon tube. In this embodiment, different from Example 1, during measurement, the positive wire and the negative wire are manually and simultaneously connected to the two ends of the carbon tube to achieve conduction between the carbon tube and the wire.
[0067] The specific embodiment of the method for measuring the resistance of a heating tube of the present invention and the specific contents of the method for measuring the resistance of a heating tube are the same as the specific contents of the method for measuring the resistance of a heating tube in the embodiment of the method for sorting heating tubes for diamond synthesis, and will not be repeated here.
[0068] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. Diamond synthesis heating tube sorting method, Its characteristics are: 1) The two ends of the heating tube are defined as a first end and a second end respectively. At the first end of the heating tube, n first end wire conduction positions are selected. The n first end wire conduction positions are distributed in the circumferential direction of the first end of the heating tube, wherein n is equal to 3 or n is greater than 3. The n first end wire conduction positions are respectively first end wire conduction position a 1 , the first end wire conduction position a 2 ……The first end wire conduction position a n , select n second end wire conduction positions corresponding to the first end wire conduction positions on the second end of the heating tube, the n second end wire conduction positions are distributed in the circumferential direction of the second end of the heating tube, and the n second end wire conduction positions are respectively the second end wire conduction positions b 1 , the second end wire conduction position b 2 ……The second end wire conduction position b n The first end wire conduction position and the second end wire conduction position are used to conduct with the resistance measuring device, and the first end wire conduction position and the second end wire conduction position corresponding to each other are located on a straight line extending along the axial direction of the heating tube; 2) At the first end, the wire conduction position a 1 and the first end wire conduction position a 1 The corresponding second end wire conduction position b 1 The positive and negative wires of the resistance measuring device are connected to each other, and the resistance of the heating tube is measured to be R 1 , at the first end the wire conducts at position a 2 and the first end wire conduction position a 2 The corresponding second end wire conduction position b 2 The positive and negative wires of the resistance measuring device are connected to each other, and the resistance of the heating tube is measured to be R 2 , at the first end the wire conducts at position a n and the first end wire conduction position a n The corresponding second end wire conduction position b n The positive and negative wires of the resistance measuring device are connected to each other, and the resistance of the heating tube is measured to be R n ; 3) Calculate the resistance R of the heating tube 0 =(R 1 +R 2 +……R n ) / n; 4) Sort the heating tubes according to their resistance.
2. The method for sorting heating tubes for diamond synthesis according to claim 1, Its characteristics are: The first-end wire conducting positions are evenly arranged in the circumferential direction of the first end of the heating tube, and the second-end wire conducting positions are evenly arranged in the circumferential direction of the second end of the heating tube.
3. The method for sorting heating tubes for diamond synthesis according to claim 1 or 2, Its characteristics are: The resistance measuring device clamps the heating tube through the conductive clamp to achieve conductive connection with the heating tube.
4. The method for sorting heating tubes for diamond synthesis according to claim 1 or 2, Its characteristics are: The resistance measuring device is a DC resistance measuring instrument.
5. Heating tube resistance measurement method, Its characteristics are: 1) The two ends of the heating tube are defined as a first end and a second end respectively. At the first end of the heating tube, n first end wire conduction positions are selected. The n first end wire conduction positions are distributed in the circumferential direction of the first end of the heating tube, wherein n is equal to 3 or n is greater than 3. The n first end wire conduction positions are respectively first end wire conduction position a 1 , the first end wire conduction position a 2 ……The first end wire conduction position a n , select n second end wire conduction positions corresponding to the first end wire conduction positions on the second end of the heating tube, the n second end wire conduction positions are distributed in the circumferential direction of the second end of the heating tube, and the n second end wire conduction positions are respectively the second end wire conduction positions b 1 , the second end wire conduction position b 2 ……The second end wire conduction position b n The first end wire conduction position and the second end wire conduction position are used to conduct with the resistance measuring device, and the first end wire conduction position and the second end wire conduction position corresponding to each other are located on a straight line extending along the axial direction of the heating tube; 2) At the first end, the wire conduction position a 1 and the first end wire conduction position a 1 The corresponding second end wire conduction position b 1 The positive and negative wires of the resistance measuring device are connected to each other, and the resistance of the heating tube is measured to be R 1 , at the first end the wire conducts at position a 2 and the first end wire conduction position a 2 The corresponding second end wire conduction position b 2 The positive and negative wires of the resistance measuring device are connected to each other, and the resistance of the heating tube is measured to be R 2 , at the first end the wire conducts at position a n and the first end wire conduction position a n The corresponding second end wire conduction position b n The positive and negative wires of the resistance measuring device are connected to each other, and the resistance of the heating tube is measured to be R n ; 3) Calculate the resistance R of the heating tube 0 =(R 1 +R 2 +……R n ) / n.
6. The method for measuring the resistance of a heating tube according to claim 5, Its characteristics are: The first-end wire conducting positions are evenly arranged in the circumferential direction of the first end of the heating tube, and the second-end wire conducting positions are evenly arranged in the circumferential direction of the second end of the heating tube.
7. The method for measuring the resistance of a heating tube according to claim 5 or 6, Its characteristics are: The resistance measuring device clamps the heating tube through the conductive clamp to achieve conductive connection with the heating tube.
8. The method for measuring the resistance of a heating tube according to claim 5 or 6, Its characteristics are: The resistance measuring device is a DC resistance measuring instrument.