CN108982584B - System and method for detecting uniformity of magnesium oxide in electric heating pipe - Google Patents
System and method for detecting uniformity of magnesium oxide in electric heating pipe Download PDFInfo
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- CN108982584B CN108982584B CN201810760120.XA CN201810760120A CN108982584B CN 108982584 B CN108982584 B CN 108982584B CN 201810760120 A CN201810760120 A CN 201810760120A CN 108982584 B CN108982584 B CN 108982584B
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Abstract
The invention relates to a system and a method for detecting the uniformity of magnesium oxide in an electric heating tube, wherein the detection system comprises: the power supply equipment is connected to two ends of the electric heating pipe; the electric heating pipe is suspended and fixed on the bracket; the thermal imaging instrument is arranged in parallel with the bracket and is used for acquiring temperature information of the electric heating tube along the axial direction of the electric heating tube; and the output equipment is connected with the thermal imager and used for determining whether the distribution of the magnesium oxide in the electric heating pipe is uniform or not according to the temperature information. The detection system can quickly and accurately detect the distribution condition of magnesium oxide in the electric heating pipe by means of thermal imaging means, and further judge whether the quality of the electric heating pipe has defects, and meanwhile, the detection system cannot damage the internal structure of the electric heating pipe.
Description
Technical Field
The invention relates to the field of product quality detection of electric heating pipes, in particular to a system and a method for detecting uniformity of magnesium oxide in an electric heating pipe.
Background
The heating pipe is formed by filling an electric heating wire (ferronickel alloy) into a seamless metal pipe (a carbon steel pipe, a titanium pipe, a stainless steel pipe and a copper pipe), shrinking a pipe after filling magnesium oxide with good heat conductivity and insulativity into a gap part, and processing the pipe into various shapes required by a user, so that the size, the distribution uniformity and the like of the particle size of the magnesium oxide greatly influence the performance of the electric heating pipe. The manufacturing process and the factory inspection of the electric heating pipe have certain requirements on the uniformity of magnesium oxide filling, but because the electric heating pipe is wrapped by the metal pipe, the direct observation means cannot be adopted to judge whether the magnesium oxide is uniformly distributed in the electric heating pipe, so that the performance evaluation and the factory inspection of the electric heating pipe are influenced.
Disclosure of Invention
A first object of the present invention is to provide a detection system for an electric heating tube, which can quickly and accurately detect the distribution of magnesium oxide in the electric heating tube without damaging the electric heating tube.
The second purpose of the invention is to provide an electric heating tube detection method, which comprises the electric heating tube detection system provided by the invention.
In order to achieve the above object, the present invention provides a system for detecting uniformity of magnesium oxide in an electric heating tube, comprising: the power supply equipment is connected to two ends of the electric heating pipe; the electric heating pipe is suspended and fixed on the bracket; the thermal imaging instrument is arranged in parallel with the bracket and is used for acquiring temperature information of the electric heating tube along the axial direction of the electric heating tube; and the output equipment is connected with the thermal imager and used for determining whether the distribution of the magnesium oxide in the electric heating pipe is uniform or not according to the temperature information.
Optionally, the support comprises a support body and two support rods fixed on the support body, the support rods are formed into a Y-shaped structure, two ends of the electric heating tube are fixed in an opening at the upper end of the Y-shaped structure in an overlapping manner, and the thermal imaging camera and the support body are arranged in parallel.
Optionally, the distance between the thermal imager and the support body is equal to the focal length of the thermal imager.
Optionally, power supply unit including be used for with external power source be connected uninterrupted power source and with the voltage regulator that uninterrupted power source is connected, the voltage regulator is connected to through the wiring electric heating pipe's both ends.
Optionally, uninterrupted power source with still be connected with first control between the voltage regulator, the voltage regulator with still be connected with the second control between the electric heating pipe, the second control passes through the wiring is connected to the both ends of electric heating pipe.
According to a second aspect of the present invention, there is also provided a method for detecting uniformity of magnesium oxide in an electric heating tube, where the electric heating tube is connected to the system for detecting uniformity of magnesium oxide in the electric heating tube, and the method includes:
after the electric heating pipe is fixed on the bracket, adjusting the output voltage of the power supply equipment to the rated voltage of the electric heating pipe and electrifying;
after the electric heating pipe is electrified for a preset time, controlling the thermal imager to acquire temperature information of the electric heating pipe along the axis direction of the electric heating pipe;
and determining whether the distribution of the magnesium oxide in the electric heating pipe is uniform or not according to the temperature information.
Optionally, the determining whether the distribution of the magnesium oxide in the electric heating tube is uniform according to the temperature information includes:
respectively determining the temperature of each heating section in the electric heating pipe according to the temperature information, wherein the electric heating pipe is equally divided into N heating sections;
sequencing all heating sections according to the temperature from high to low, and determining J heating sections which are ranked at the top as first target heating sections, wherein J/N is larger than or equal to a preset proportion threshold;
according to the temperature of each heating section, respectively determining the temperature difference of the heating sections at the adjacent positions in the electric heating pipe in unit length;
sorting the temperature differences in the descending order, and determining a heating section with a later position in the adjacent position heating sections corresponding to K temperature differences in the front ranking as a second target heating section, wherein K/N is greater than or equal to the preset proportion threshold;
determining a heating section which is the second target heating section in the first target heating section as a third target heating section;
and determining whether the distribution of the magnesium oxide in the electric heating pipe is uniform or not according to the number of the third target heating sections.
Optionally, the determining whether the distribution of the magnesium oxide in the electric heating tube is uniform according to the number of the third target heating sections includes:
when the number of the third target heating sections is larger than a preset number threshold, determining that the distribution of the magnesium oxide in the electric heating pipe is not uniform;
and when the number of the third target heating sections is smaller than or equal to the preset number threshold, determining that the distribution of the magnesium oxide in the electric heating pipe is uniform.
Optionally, the preset number threshold is set according to N.
Optionally, the method further comprises:
and when the magnesium oxide in the electric heating tube is determined to be unevenly distributed, determining the position corresponding to the third target heating section as the position of the magnesium oxide in the electric heating tube which is unevenly distributed.
According to the technical scheme, the thermal imager is adopted to directly obtain the temperature information in the central axis direction of the normal working process of the electric heating pipe, the output equipment can calculate and analyze the temperature information to obtain a final detection result, the detection system can quickly and accurately detect the distribution condition of magnesium oxide in the electric heating pipe by means of thermal imaging, and then judges whether the quality of the electric heating pipe has defects or not, and meanwhile, the detection system cannot damage the internal structure of the electric heating pipe.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is a schematic diagram of an exemplary embodiment of a system for detecting uniformity of magnesium oxide in an electrical heating tube;
FIG. 2 is a flow chart illustrating a method for detecting uniformity of magnesium oxide within an electrical heating tube according to an exemplary embodiment.
FIG. 3 is a flow chart illustrating a method of determining whether the distribution of magnesium oxide within an electrical heating tube is uniform, according to an exemplary embodiment.
Fig. 4 is a schematic diagram illustrating the construction of an electrical heating tube segment according to an exemplary embodiment.
FIG. 5 is a flow chart illustrating a method of determining whether the distribution of magnesium oxide within an electrical heating tube is uniform in accordance with another exemplary embodiment.
FIG. 6 is a flow chart illustrating a method for uniformity detection of magnesium oxide within an electrical heating tube according to another exemplary embodiment.
Description of the reference numerals
1 power supply equipment 2 electric heating pipe
3 support 4 thermal imaging system
5 output equipment 11 uninterrupted power source
12 voltage regulator 13 connection
14 first control element 15 second control element
31 bracket body 32 support rod
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations.
As shown in fig. 1, the present invention provides a system for detecting uniformity of magnesium oxide in an electric heating tube, the system includes a power supply device 1, a support 3, a thermal imager 4 and an output device 5, wherein the power supply device 1 is connected to two ends of the electric heating tube 2, the electric heating tube 2 is suspended and fixed on the support 3, the thermal imager 4 is parallel to the support 3 and is used for acquiring temperature information of the electric heating tube 2 along an axial direction thereof, and the output device 5 is connected to the thermal imager 4 and is used for determining whether distribution of magnesium oxide in the electric heating tube 2 is uniform according to the temperature information. It should be noted that the output voltage of the power supply device 1 is adjustable and equal to the rated voltage of the electric heating tube 2 to be detected, the output voltage of the power supply device 1 can be adjusted according to the electric heating tubes 2 of different models, so as to ensure the normal operation of the electric heating tube 2, the output device 5 can be a computer connected with the thermal imager 4 through a USB cable, an infrared temperature map acquired by the thermal imager 4 can be transmitted to the computer, the computer performs related operations and analyses, and an operation result is transmitted to the thermal imager 4 and displayed on the infrared temperature map. In addition, the electric heating tube 2 is suspended and fixed through the support 3, and the thermal imager 4 can collect the temperature information of any point in the axis direction of the electric heating tube to ensure the accuracy and comprehensiveness of the acquired temperature information.
Through the technical scheme, the thermal imager 4 is adopted to directly acquire the temperature information in the axial line direction of the normal working process of the electric heating pipe 2, the output device 5 can calculate and analyze the temperature information to obtain a final detection result, the detection system can quickly and accurately detect the distribution condition of magnesium oxide in the electric heating pipe 2 by means of thermal imaging means, and then judges whether the quality of the electric heating pipe 2 has defects or not, and meanwhile, the detection system cannot damage the internal structure of the electric heating pipe 2.
The support 3 may be of any suitable construction. In the present invention, as shown in fig. 1, the holder 3 includes a holder body 31 and two support rods 32 fixed to the holder body 31, the support rods 32 are formed in a Y-shaped structure, both ends of the electric heating pipe 2 are fixed in an opening at the upper end of the Y-shaped structure in an overlapping manner, and the thermal imaging camera 4 and the holder body 31 are arranged in parallel. Like this, electric heating pipe 2's both ends detachably fixes in the opening of Y shape structure, and firm reliable be convenient for change to support 3 can not shelter from electric heating pipe 2's effective heating area, and the temperature of the axial direction of the thermal imaging appearance 4 pair of being convenient for is gathered. In other embodiments, the bracket 3 may also be formed as a hook for lifting both ends of the electric heating tube 2 from above, which also enables fixing of the electric heating tube 2.
For the accuracy of guaranteeing thermal imager 4 and gathering infrared temperature image, when arranging support 3 and thermal imager 4, the interval between thermal imager 4 and the support body 31 equals thermal imager 4's focus, thermal imager 4's infrared detector can just in time aim at electric heating pipe 2, in addition, when carrying out arranging of this detecting system, can be with thermal imager 4's rigidity, through adjusting the distance of support body 31 for thermal imager 4, easy operation is convenient.
In the invention, as shown in fig. 1, the power supply device 1 comprises an uninterruptible power supply 11 for connecting with the external power supply and a voltage regulator 12 connected with the uninterruptible power supply, wherein the voltage regulator 12 is connected to two ends of the electric heating tube 2 through a wiring 13, the voltage regulator 12 can be an auto-coupling voltage regulator, the external power supply charges the uninterruptible power supply 11, and after the stabilizing module of the uninterruptible power supply 11 is fully charged, the output voltage can be regulated through the auto-coupling voltage regulator, so that the output voltage is ensured to be exactly equal to the rated voltage of the electric heating tube 2.
A first control part 14 is connected between the uninterruptible power supply 11 and the voltage regulator 12, a second control part 15 is connected between the voltage regulator 12 and the electric heating pipe 2, and the second control part 15 is connected to two ends of the electric heating pipe 2 through a connecting wire 13. Specifically, the first control element 14 may be a first-stage contactor, the second control element 15 may be a second-stage contactor, and when the first-stage contactor is closed, the external power supply, the uninterruptible power supply 11, and the voltage regulator 12 are connected, so that after the output voltage of the voltage regulator 12 is equal to the rated voltage of the electric heating pipe 2, the second-stage contactor may be closed, and the electric heating pipe 2 is powered on. In addition, the first controller 14 and the second controller 15 can also cut off the circuit in time when a danger occurs, thereby preventing a safety accident from occurring. In other embodiments, the first control member 14 and the second control member 15 can also be respectively formed as a switch for controlling the on and off of the circuit.
FIG. 2 is a flow chart illustrating a method for detecting uniformity of magnesium oxide within an electrical heating tube according to an exemplary embodiment. As shown in fig. 2, the method may include the following steps.
In step 21, after the electric heating tube is fixed on the bracket, the output voltage of the power supply device is adjusted to the rated voltage of the electric heating tube and is electrified.
In the invention, the method can be applied to the detection system for the uniformity of the magnesium oxide in the electric heating tube, and the electric heating tube 2 is connected with the detection system for the uniformity of the magnesium oxide in the electric heating tube. When a user needs to detect whether the distribution of the magnesium oxide in the electric heating tube 2 is uniform, the user can firstly place the electric heating tube 2 on the bracket 3 in the detection system (as shown in fig. 1), and directly connect the power supply device 1 with an external power supply; the detection system can then control the first control element 14 to close and adjust the output voltage of the power supply device 1 to the nominal voltage of the electric heating tube 2, wherein the nominal voltage can fluctuate within the range of 110V-220V, which is, for example, 110V. Also, the above rated voltage of the voltage regulation value across the above electric heating tube 2 may be adjusted by the voltage regulator 12 shown in fig. 1.
At the same time, the detection system may also adjust the output frequency of the power supply device 1 to the nominal frequency of the electric heating tube 2, wherein the nominal frequency may fluctuate within the range of 50Hz-60 Hz.
Finally, the detection system can energize the electric heating tube 2.
For example, the second control element 15 shown in fig. 1 may be closed to energize the electric-heating pipe 2.
In step 22, after the electric heating tube is electrified for a preset time, the thermal imaging system is controlled to acquire temperature information of the electric heating tube along the axial direction of the electric heating tube.
In the present invention, after the electric heating tube 2 is powered for the preset time in the step 21, the thermal imaging system 4 is controlled to acquire an infrared temperature image of the electric heating tube 2 along the axial direction thereof, wherein the infrared temperature image may include temperature information of any point along the axial direction of the electric heating tube 2. Then, the thermal imaging camera 4 can output the temperature information of the electric heating tube 2 along the axial direction thereof, which is collected by the thermal imaging camera, to the output device 5.
The preset time may be set by a user, or may be a default empirical value (for example, 5min), and is not particularly limited in the present invention.
In step 23, it is determined whether the distribution of magnesium oxide in the electric heating tube is uniform based on the temperature information.
In the present invention, after the output device 5 acquires the temperature information of the electric heating tube 2 along the axial direction thereof, which is acquired by the thermal imaging instrument 4, it can be determined whether the distribution of the magnesium oxide in the electric heating tube 2 is uniform or not according to the temperature information.
Specifically, whether the distribution of magnesium oxide in the electric-heating tube 2 is uniform or not can be determined through steps 231 to 236 shown in fig. 3.
In step 231, the temperature of each heating section in the electric heating tube is determined according to the temperature information.
In the present invention, the above-mentioned electric-heating tube 2 may be equally divided into N heating sections in the axial direction thereof (as shown in fig. 4, the electric-heating tube 2 includes the heating sections 20 Heating section 21 Heating section 22…, heating section 2N-1These N heating segments), where the total length of the electric heating tube 2 is L, and the length L of each heating segment is L/N. Specifically, since the temperature information of any point in the axial direction of the electric-heating tube 2 is known, the average value of the temperatures of the points in the heating section can be used as the temperature of the heating section for each heating section.
Illustratively, N is 300, L is 30cm, and L is 1mm, i.e., the temperature of each heating zone is calculated every 1 mm.
In step 232, the heating sections are sorted in the order of temperature from high to low, and J heating sections ranked at the top are determined as first target heating sections.
In the invention, J/N is greater than or equal to a preset proportion threshold value. After the temperatures of the N heating sections are obtained in step 231, the heating sections may be sorted in the order of the temperatures from high to low, and then J heating sections ranked at the top may be determined as the first target heating section.
Illustratively, the preset proportion threshold is 5%, N is 300, and J is 60; in this way, after the temperatures of the 300 heating segments are obtained in step 231, the 300 heating segments may be sorted in the order of the temperatures from high to low, and then the top 60 heating segments may be determined as the first target heating segments.
Also, in one embodiment, after the first target heating segment is determined, it may be placed in a set T, where the set T includes J elements.
In step 233, the temperature difference per unit length of the heating segments at the adjacent positions in the electric heating tube is determined according to the temperature of each heating segment.
In the present invention, the adjacent heating sections refer to two heating sections adjacent to each other in the electric-heating pipe 2, and exemplarily, as shown in fig. 4, the heating sections 22And a heating section 21 Heating sections 2 for adjacent positionsN-1And a heating section 2N-2Heating the sections in adjacent positions. After the temperature of each heating segment is determined in step 232, the temperature difference between any two adjacent heating segments can be determined, and then the temperature difference per unit length can be determined according to the temperature difference between the adjacent heating segments.
For example, the temperature difference per unit length of the adjacent position heating section may be determined by the following equation (1):
wherein, Delta TnIs a heating section 2nAnd a heating section 2n-1Temperature difference per unit length; l is the length of the heating section;tnis a heating section 2nThe temperature of (a); t is tn-1Is a heating section 2n-1The temperature of (a); n-1, 2.
In step 234, the temperature differences are sorted in descending order, and the heating segment with the back position in the adjacent position heating segments corresponding to the K temperature differences with the top rank is determined as the second target heating segment.
In the invention, K/N is greater than or equal to the preset proportion threshold. After the N-1 temperature differences are determined in step 233, the N-1 temperature differences may be arranged in descending order, and then, a heating section located at the back (i.e., a heating section with a larger index in fig. 4) of the adjacent position heating sections corresponding to the K temperature differences that are ranked at the front is determined as a second target heating section.
Illustratively, the preset proportion threshold is 5%, N is 100, and K is 5; in this way, after the 99 temperature differences are obtained in step 233, the 99 temperature differences may be sorted in order from high to low, and then, the top 5 temperature differences may be obtained, where the heating sections at the adjacent positions corresponding to the top 5 temperature differences are the heating sections 2 respectively1And a heating section 22 Heating section 26And a heating section 27 Heating section 218And a heating section 219 Heating section 241And a heating section 242 Heating section 289And a heating section 290Thus, the heating section 2 can be connected2 Heating section 27 Heating section 219 Heating section 242Heating section 290A second target heating segment is determined.
Further, for example, the preset ratio threshold is 5%, N is 300, and K is 15; in this way, after 299 temperature differences are acquired in step 233, the 299 temperature differences may be sorted in descending order, and then, of adjacent position heating segments corresponding to the respective 15 temperature differences that are ranked earlier, a heating segment that is positioned later may be determined as the second target heating segment.
Also, in one embodiment, after the second target heating segment is determined, it may be placed in a set V, wherein the set V includes K elements.
Note that, the preset ratio thresholds K, J may be set by the user or may be default empirical values, and for example, the preset ratio thresholds default to 5%, K, J may be equal to or different from each other, and are not particularly limited in the present invention.
In step 235, the heating segment of the first target heating segment that is the second target heating segment is determined as the third target heating segment.
After the first target heating zone and the second target heating zone are determined through steps 232 and 234, respectively, a heating zone of the first target heating zone and the second target heating zone may be determined as a third target heating zone.
In one embodiment, as mentioned above, the first target heating segments determined in the step 232 are placed in the set T, and the second target heating segments determined in the step 234 are placed in the set V, so that all the heating segments in the intersection B of the set T and the set V are the third target heating segments.
For example, T ═ { heating zone 2 ═1 Heating section 26 Heating section 27 Heating section 242Heating section 290V ═ heating section 22 Heating section 27 Heating section 219 Heating section 242 Heating section 290N, B ═ T ═ V ═ heating section 27 Heating section 242 Heating section 290I.e. the heating section 2 can be connected7 Heating section 242And a heating section 290A third target heating segment is determined.
In another embodiment, the heating zones that belong to the second target heating zone at the same time can be selected from the first target heating zones determined in step 232 and used as the third target heating zones.
Illustratively, the first targeted heating segment comprises a heating segment 21 Heating section 26 Heating section 27 Heating section 242 Heating section 290 AddingHot stage 292 Heating section 2100The second target heating section comprises a heating section 22 Heating section 27 Heating section 219 Heating section 242 Heating section 290 Heating section 2 of the first target heating section7Heating section 242And a heating section 290Also the second target heating section, and thus, the heating section 2 can be replaced7 Heating section 242And a heating section 290A third target heating segment is determined.
Returning to fig. 3, in step 236, it is determined whether the distribution of the magnesium oxide in the electric heating tube is uniform according to the number of the third target heating sections.
In the present invention, after the third target heating section is determined through the above step 235, the number of the third target heating sections may be counted, and then, whether the distribution of the magnesium oxide in the electric heating tube 2 is uniform or not may be determined according to the number of the third target heating sections.
In one embodiment, it may be determined whether the ratio of the number of the third target heating sections to N is greater than a preset ratio threshold, and then it may be determined whether the distribution of the magnesium oxide in the electric heating pipe 2 is uniform according to the determination result. Specifically, when the ratio of the number of the third target heating sections to N is greater than the preset ratio threshold, it may be determined that the distribution of the magnesium oxide in the electric heating tube 2 is not uniform; and when the ratio of the number of the third target heating sections to the N is less than or equal to the preset ratio threshold, it can be determined that the distribution of the magnesium oxide in the electric heating tube 2 is uniform.
The preset ratio threshold may be a value set by a user, or may be a default empirical value (e.g., 4%), which is not specifically limited in the present invention.
In another embodiment, it may be determined whether the number of the third target heating sections is greater than a preset number threshold, and then, it is determined whether the distribution of the magnesium oxide in the electric heating pipe 2 is uniform according to the determination result. Specifically, whether the distribution of magnesium oxide within electric-heating tube 2 is uniform can be determined by steps 2361 to 2364 shown in fig. 5.
In step 2361, it is determined whether the number of third target heating segments is greater than a preset number threshold.
In the present invention, the preset number threshold may be set by a user according to the size of the number N of the heating sections included in the electric heating tube 2, for example, the preset number threshold is [ 4% N ], or may be a default empirical value, and is not limited in the present invention.
Specifically, when the number of the third target heating segments is greater than the preset number threshold, the following step 2362 is performed; when the number of the third target heating segments is less than or equal to the preset number threshold, the following step 2363 is performed.
In step 2362, it is determined that the distribution of magnesium oxide within the electrical heating tube is not uniform.
In step 2363, it is determined that the magnesium oxide is uniformly distributed within the electrical heating tube.
FIG. 6 is a flowchart illustrating a method for detecting uniformity of magnesium oxide within an electrical heating tube, according to another exemplary embodiment. As shown in fig. 6, the above method may further include the following steps.
In step 24, when it is determined that the distribution of the magnesium oxide in the electric heating tube is not uniform, a position corresponding to each third target heating section may be determined as a position where the distribution of the magnesium oxide in the electric heating tube is not uniform.
In the present invention, when it is determined in step 236 that the distribution of the magnesium oxide in the electric-heating tube 2 is not uniform, the position corresponding to each of the third target heating sections may be determined as the position where the distribution of the magnesium oxide in the electric-heating tube is not uniform. Therefore, a user can timely know the position of the magnesium oxide in the electric heating pipe 2, which is not uniformly distributed, so that the reason can be conveniently found, and a basis is provided for improving the quality of the electric heating pipe.
In addition, in order to facilitate a user to clearly and intuitively understand the position of the non-uniform distribution of magnesium oxide in the electric-heating pipe 2, each of the third target heating sections determined in step 236 may be highlighted (e.g., highlighted) in the segmented schematic diagram of the electric-heating pipe 2 shown in fig. 4.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. The method for detecting the uniformity of the magnesium oxide in the electric heating pipe is characterized in that an electric heating pipe internal magnesium oxide uniformity detection system is adopted, the electric heating pipe internal magnesium oxide uniformity detection system comprises a power supply device (1), a support (3) and a thermal imager (4), the power supply device (1) is connected to two ends of the electric heating pipe (2), the electric heating pipe (2) is fixed on the support (3) in a suspended mode, the thermal imager (4) is arranged in parallel with the support (3), and the thermal imager (4) is used for collecting temperature information of the electric heating pipe (2) in the axial direction of the electric heating pipe; the output equipment (5) is connected with the thermal imager (4) and used for determining whether the distribution of the magnesium oxide in the electric heating pipe (2) is uniform or not according to the temperature information;
the detection method comprises the following steps:
after the electric heating pipe (2) is fixed on the bracket (3), the output voltage of the power supply device (1) is adjusted to the rated voltage of the electric heating pipe (2) and is electrified;
after the electric heating pipe (2) is electrified for a preset time, controlling the thermal imaging instrument (4) to acquire temperature information of the electric heating pipe (2) along the axis direction;
determining whether the distribution of the magnesium oxide in the electric heating pipe (2) is uniform or not according to the temperature information, comprising: respectively determining the temperature of each heating section in the electric heating pipe (2) according to the temperature information, wherein the electric heating pipe (2) is equally divided into N heating sections; sequencing all heating sections according to the temperature from high to low, and determining J heating sections which are ranked at the top as first target heating sections, wherein J/N is larger than or equal to a preset proportion threshold; according to the temperature of each heating section, the temperature difference of the heating sections at the adjacent positions in the electric heating pipe (2) on the unit length is respectively determined; sorting the temperature differences in the descending order, and determining a heating section with a later position in the adjacent position heating sections corresponding to K temperature differences in the front ranking as a second target heating section, wherein K/N is greater than or equal to the preset proportion threshold; determining a heating section which is the second target heating section in the first target heating section as a third target heating section; and determining whether the distribution of the magnesium oxide in the electric heating pipe (2) is uniform or not according to the number of the third target heating sections.
2. The method according to claim 1, wherein the determining whether the distribution of the magnesium oxide in the electric heating tube (2) is uniform according to the number of the third target heating sections comprises:
when the number of the third target heating sections is larger than a preset number threshold, determining that the distribution of the magnesium oxide in the electric heating pipe (2) is not uniform;
and when the number of the third target heating sections is smaller than or equal to the preset number threshold, determining that the distribution of the magnesium oxide in the electric heating pipe (2) is uniform.
3. The method of claim 2, wherein the predetermined number threshold is set according to N.
4. The method according to any one of claims 1-3, further comprising:
when the fact that the distribution of the magnesium oxide in the electric heating pipe (2) is not uniform is determined, the position corresponding to the third target heating section is determined as the position where the distribution of the magnesium oxide in the electric heating pipe (2) is not uniform.
5. The method according to claim 1, characterized in that the holder (3) comprises a holder body (31) and two support rods (32) fixed to the holder body (31), the support rods (32) are formed into a Y-shaped structure, both ends of the electric heating tube (2) are fixed in an opening at the upper end of the Y-shaped structure in an overlapping manner, and the thermal imaging camera (4) and the holder body (31) are arranged in parallel.
6. A method according to claim 5, characterized in that the spacing between the thermal imager (4) and the holder body (31) is equal to the focal length of the thermal imager (4).
7. The method according to claim 1, characterized in that the power supply equipment (1) comprises an uninterruptible power supply (11) for connection with an external power supply and a voltage regulator (12) connected to the uninterruptible power supply, the voltage regulator (12) being connected to both ends of the electric heating tube (2) by means of a connection (13).
8. Method according to claim 7, characterized in that a first control (14) is also connected between the uninterruptible power supply (11) and the pressure regulator (12), and a second control (15) is also connected between the pressure regulator (12) and the electric heating pipe (2), the second control (15) being connected to both ends of the electric heating pipe (2) by means of the wiring (13).
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