Furnace temperature uniformity detection method and non-contact thermal imaging temperature measuring device

Abstract

The invention provides a furnace temperature uniformity detection method and a non-contact thermal imaging temperature measurement device.The device comprises a non-contact infrared thermometer, an infrared temperature sensor and a temperature measurement frame.The method comprises the steps that when the furnace temperature of a heat treatment furnace is detected, the positions and the number of test points of the heat treatment furnace are determined according to the detection temperature of the heat treatment furnace; designing a furnace temperature uniformity detection device; determining the position of the temperature measuring hole according to the positions and the number of detection points of the heat treatment furnace; detecting the uniformity of the furnace temperature by adopting a non-contact thermal imaging temperature measuring device; and finally connecting computer software for data analysis. The novel temperature measuring frame capable of being telescopically adjusted and the non-contact thermal imaging temperature measuring technology are adopted, the requirements of various temperature measuring frames can be met, the company cost is reduced, meanwhile, it is guaranteed that the detection environment is safe, clean and tidy, and the detection efficiency is improved. The problems of tedious operation process, large occupied space, low detection efficiency, inaccurate data transmission and the like in the detection process of the heat treatment furnace are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of furnace temperature uniformity detection of a heat treatment furnace, and specifically relates to a furnace temperature uniformity detection method and a non-contact thermal imaging temperature measuring device. Background Art

[0002] When using a heat treatment furnace to heat treat parts, the uneven distribution of the heat treatment furnace temperature will cause changes in the strength and toughness of the parts, thereby affecting the structural service life of the entire component.

[0003] The current existing technology mainly uses the following methods to detect the temperature uniformity of a heat treatment furnace: first, determine the number and position of detection points in the effective heating zone of the box-type heat treatment furnace; second, firmly bind the thermocouple to the required temperature measurement position on the temperature measuring frame; and finally, connect the thermocouple to the detection recorder through a compensation wire, and perform detection and record data after power is turned on. However, when using the above-mentioned existing detection technology for detection, during the connection process of the thermocouple, the inspector needs to connect the thermocouple and the inspection recorder one by one. This process is cumbersome and the waiting time is too long. At the same time, the thermocouple detection length of the heat treatment furnace is eight meters. During use, the thermocouple needs to be bundled for easy detection, and the detection process takes up too much space, affecting other equipment and normal production operations, resulting in reduced detection efficiency for inspectors. Summary of the invention

[0004] In order to solve the problems of complicated operation process, large space occupied and reduced detection efficiency of the existing heat treatment furnace temperature uniformity detection process, the present invention provides a simple, quick and more efficient furnace temperature uniformity detection method and a non-contact thermal imaging temperature measurement device.

[0005] A method for detecting furnace temperature uniformity, characterized in that it specifically comprises the following steps:

[0006] Step 1: Design a furnace temperature uniformity detection device according to the detection temperature of the heat treatment furnace;

[0007] First, make and adjust the temperature measuring frame; then determine the location and number of test points of the heat treatment furnace according to the standard, the temperature, size and volume of the effective heating zone of the heat treatment furnace; then install the required number of infrared temperature sensors for measuring the furnace temperature uniformity at the required positions on the temperature measuring frame; finally, place the temperature measuring frame at the detection position in the heat treatment furnace;

[0008] Step 2: Determine the location of the temperature measuring holes according to the detection position and quantity of the heat treatment furnace;

[0009] Step 3: Check the furnace temperature uniformity and record the data;

[0010] According to the detection temperature of the heat treatment furnace, turn on the switch of the non-contact thermal imaging temperature measuring device, gradually heat up the heat treatment furnace to the detection temperature, and then pass the light beam emitted by the infrared thermometer through the temperature measuring hole to perform infrared detection on the temperature of the test point in the effective heating area of ​​the heat treatment furnace, and record the data at the same time;

[0011] Step 4: Connect computer software for data analysis;

[0012] After the data collection is completed, the detection device designed in step 1 is connected to the computer network, and then the data is uploaded to the computer software to analyze the temperature uniformity of the heat treatment furnace and ensure the insulation accuracy.

[0013] Furthermore, the temperature measuring frame in step 1 is made of a heat-resistant alloy material, and its connection is assembled by quickly adjustable telescopic rods, which are adjusted according to the size of the heat treatment furnace.

[0014] Furthermore, the standard in step one is the national standard GB / T9452-2023 "Method for Determination of Effective Heating Zone of Heat Treatment Furnace".

[0015] Furthermore, in the step 1, all the test points are evenly arranged in the height, length and width directions of the effective heating zone of the heat treatment furnace.

[0016] Furthermore, the size and height of the temperature measuring hole in step 2 can be set so that the light beam emitted by the infrared thermometer can be irradiated on the position to be detected in the heat treatment furnace.

[0017] Furthermore, the temperature measuring hole is sealed with a high temperature material to ensure the temperature inside the heat treatment furnace and prevent the temperature inside the furnace from being affected by the airflow.

[0018] The present invention also provides a non-contact thermal imaging temperature measurement device, which is characterized by comprising a non-contact infrared thermometer, an infrared temperature sensor and a temperature measurement stand, for implementing the above method;

[0019] The light beam emitted by the non-contact infrared thermometer is irradiated onto the infrared temperature sensor through the temperature measuring hole;

[0020] There are several infrared temperature sensors, which are respectively installed at required positions on the temperature measuring rack;

[0021] The temperature measuring frame is placed at a detection position in the heat treatment furnace.

[0022] Furthermore, the positions and number of the infrared temperature sensors are determined according to the positions and number required for detecting the effective heating zone of the heat treatment furnace in step 1 of the above method.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention provides a non-contact thermal imaging temperature measuring device, including a non-contact infrared thermometer, an infrared temperature sensor and a temperature measuring frame. Compared with the prior art which uses thermocouples and inspection recorders to detect the temperature uniformity of a heat treatment furnace, the present invention has a simpler structure and occupies a smaller space. The temperature measuring frame is a new type of retractable and adjustable temperature measuring frame, which can meet the needs of temperature measuring frames of various forms and sizes, thereby improving the detection efficiency of the heat treatment furnace and reducing the company's costs.

[0025] 2. The infrared temperature sensor method is adopted in the present invention, so that the inspectors can quickly and effectively detect the uniformity of the temperature in the furnace when conducting the temperature uniformity test of the heat treatment furnace, which solves the problems of cumbersome operation process, large space occupation and low detection efficiency of the heat treatment furnace during the detection process, and improves the efficiency and accuracy of the data.

[0026] 3. The present invention adopts non-contact thermal imaging temperature measurement to ensure a safe, clean and tidy detection environment, and can effectively solve the problem of the thermocouples in the heat treatment furnace being too long, cumbersome to use and messy to stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or other features and advantages of the present invention will become more easily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and some features are exaggerated or reduced to show details of specific components. In the accompanying drawings:

[0028] Figure 1 It is a flowchart of the detection method of the present invention;

[0029] Figure 2 This is a detection diagram of the effective heating area of ​​the heat treatment furnace according to an embodiment of the present invention;

[0030] Description of reference numerals:

[0031] 1-first target; 2-second target; 3-third target; 4-fourth target; 5-fifth target; 6-sixth target; 7-seventh target; 8-eighth target; 9-ninth target; 10-light beam; 11-temperature measuring hole. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.

[0033] Reference Figure 1 The present invention provides a furnace temperature uniformity detection method, which specifically comprises the following steps:

[0034] Step 1: Design a furnace temperature uniformity detection device based on the detection temperature of the heat treatment furnace

[0035] According to the working conditions of the heat treatment furnace, the temperature uniformity of the furnace temperature is determined. At present, the operating temperature of the heat treatment furnace is above 300℃. A non-contact thermal imaging temperature measurement device is designed, which will have the advantages of fast response time, safe use and long service life during operation.

[0036] The non-contact thermal imaging temperature measuring device is mainly composed of three parts: a non-contact infrared thermometer, an infrared temperature sensor and a temperature measuring frame. The design process is: first, make and adjust the temperature measuring frame: the temperature measuring frame is made of heat-resistant alloy material, and its connection is assembled by quickly adjustable telescopic rods, which can be quickly adjusted according to the size of the heat treatment furnace, which is convenient and practical; then according to the national standard GB / T9452-2023 "Determination Method of Effective Heating Zone of Heat Treatment Furnace", according to the temperature, size and volume of the effective heating zone of the heat treatment furnace, the position and number of test points of the heat treatment furnace are determined to ensure that all test points are evenly arranged in the height, length and width directions of the effective heating zone of the heat treatment furnace; then the number of infrared temperature sensors required to measure the uniformity of furnace temperature are respectively installed and fixed at the required positions on the temperature measuring frame with heat-resistant metal wires; finally, the temperature measuring frame is placed at the position of the effective test heating zone in the heat treatment furnace for subsequent furnace temperature uniformity detection.

[0037] In this embodiment, a box-type heat treatment furnace is used, the size of which is 1500mm×800mm×600mm, and the calculated effective heating zone volume is 1200mm×600mm×400mm. According to the national standard GB / T9452-2023 "Measurement Method for Effective Heating Zone of Heat Treatment Furnace", the volume of its effective heating zone is less than 6.4m 3 , at this time, the number of test points required is 9, and the test positions are as follows Figure 2 As shown in the figure, the positions of the 9 required detection points of the heat treatment furnace are called targets. The fifth target 5 is located at the center of the temperature measuring frame, and all other targets are 20 cm above and below the edge of the temperature measuring frame. The 9 infrared temperature sensors are respectively fixed on the targets of the temperature measuring frame with heat-resistant metal wires and placed together at the positions of the effective test heating zones in the heat treatment furnace. At this time, the non-contact thermal imaging temperature measuring device for the heat treatment furnace has been completed.

[0038] Step 2: Determine the location of the temperature measuring holes according to the detection position and number of the heat treatment furnace

[0039] After completing the non-contact thermal imaging temperature measurement device of the heat treatment furnace, close the door of the heat treatment furnace and Figure 2 As shown, a temperature measuring hole 11 is provided on the furnace door. The size and height of the temperature measuring hole 11 should be able to be irradiated by the light beam 10 emitted by the infrared thermometer on the target position in the heat treatment furnace, so as to detect the temperature of the target. At the same time, the temperature measuring hole 11 is sealed with high-temperature materials to ensure the temperature inside the heat treatment furnace and prevent the temperature inside the furnace from being affected by airflow.

[0040] Step 3: Check the furnace temperature uniformity and record the data

[0041] According to the detection temperature of the heat treatment furnace, turn on the switch of the non-contact thermal imaging temperature measuring device, gradually heat the heat treatment furnace to the detection temperature, and then use the light beam emitted by the infrared thermometer to perform infrared detection on the target temperature of the effective heating area of ​​the heat treatment furnace through the temperature measuring hole 11, and record the data at the same time.

[0042] Step 4: Connect to computer software for data analysis

[0043] After the data collection is completed, the non-contact thermal imaging temperature measurement device is connected to the computer network, and then the data is uploaded to the computer software to analyze the furnace temperature uniformity of the heat treatment furnace and ensure the insulation accuracy.

[0044] Through the analysis of the experimental results of this embodiment, we found that: the infrared temperature sensor method can effectively solve the problems of inaccurate and slow data transmission during the transmission process of thermocouples, and improve the efficiency and accuracy of data; the new retractable and adjustable temperature measuring frame can meet the needs of various forms and sizes of temperature measuring frames, improve the detection efficiency of heat treatment furnaces, and reduce company costs; non-contact thermal imaging temperature measurement ensures a safe, clean and tidy detection environment, and can effectively solve the problems of too long length, cumbersome use, and messy stacking of thermocouples in heat treatment furnaces.

[0045] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other implementations. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present invention.

Claims

1. A method for detecting furnace temperature uniformity, characterized in that: The specific steps include: Step 1: Design a furnace temperature uniformity detection device according to the detection temperature of the heat treatment furnace; First, make and adjust the temperature measuring frame; then determine the location and number of test points of the heat treatment furnace according to the standard, the temperature, size and volume of the effective heating zone of the heat treatment furnace; then install the required number of infrared temperature sensors for measuring the furnace temperature uniformity at the required positions on the temperature measuring frame; finally, place the temperature measuring frame at the detection position in the heat treatment furnace; Step 2: Determine the location of the temperature measuring holes according to the detection position and quantity of the heat treatment furnace; Step 3: Check the furnace temperature uniformity and record the data; According to the detection temperature of the heat treatment furnace, turn on the switch of the non-contact thermal imaging temperature measuring device, gradually heat up the heat treatment furnace to the detection temperature, and then pass the light beam emitted by the infrared thermometer through the temperature measuring hole to perform infrared detection on the temperature of the test point in the effective heating area of ​​the heat treatment furnace, and record the data at the same time; Step 4: Connect computer software for data analysis; After the data collection is completed, the detection device designed in step 1 is connected to the computer network, and then the data is uploaded to the computer software to analyze the temperature uniformity of the heat treatment furnace and ensure the insulation accuracy.

2. A furnace temperature uniformity detection method as claimed in claim 1, characterized in that: The temperature measuring frame in step 1 is made of heat-resistant alloy material, and its connection is assembled by telescopic rods that can be adjusted quickly and adjusted according to the size of the heat treatment furnace.

3. A furnace temperature uniformity detection method as claimed in claim 1, characterized in that: The standard in step 1 is the national standard GB / T9452-2023 "Method for determining the effective heating zone of a heat treatment furnace".

4. A furnace temperature uniformity detection method as claimed in claim 1, characterized in that: In the step 1, all the test points are evenly arranged in the height, length and width directions of the effective heating zone of the heat treatment furnace.

5. A furnace temperature uniformity detection method as claimed in claim 1, characterized in that: The size and height of the temperature measuring hole in step 2 can be set so that the light beam emitted by the infrared thermometer can be irradiated on the position in the heat treatment furnace that needs to be tested.

6. A furnace temperature uniformity detection method as claimed in claim 1 or 5, characterized in that: The temperature measuring hole is sealed with a high temperature material to ensure the temperature inside the heat treatment furnace and prevent the temperature inside the furnace from being affected by the airflow.

7. A non-contact thermal imaging temperature measurement device, characterized in that: It comprises a non-contact infrared thermometer, an infrared temperature sensor and a temperature measuring stand, and is used to implement the detection method according to any one of claims 1 to 6; The light beam emitted by the non-contact infrared thermometer is irradiated onto the infrared temperature sensor through the temperature measuring hole; There are several infrared temperature sensors, which are respectively installed at required positions on the temperature measuring rack; The temperature measuring frame is placed at a detection position in the heat treatment furnace.

8. A non-contact thermal imaging temperature measurement device as claimed in claim 7, characterized in that: The positions and number of the infrared temperature sensors are determined according to the positions and number required for detecting the effective heating zone of the heat treatment furnace in step 1 of claim 1.

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