Test positioning device and test positioning method for verification furnace of base metal thermocouple

Abstract

The present invention belongs to the technical field of metrology test tooling, and specifically discloses a test positioning device and a test positioning method for a noble metal thermocouple calibration furnace. The test positioning device includes a positioning main body, movable chucks, and a driving arm. The positioning main body is rotatably installed in the temperature measurement hole, and a positioning cavity is arranged in the axial direction of the positioning main body; there are two movable chucks, and the two movable chucks are detachably installed side by side in the positioning cavity to form a first positioning hole, a second positioning hole, and a third positioning hole in the positioning cavity by surrounding. The second positioning hole and the third positioning hole are symmetrically arranged on both sides of the first positioning hole; the driving arm is connected to the positioning main body, and the driving arm drives the positioning main body to rotate in the temperature measurement hole under the action of an external force. The present invention can well meet the test requirements of the axial temperature field and the radial temperature field of the noble metal thermocouple calibration furnace, greatly improving the test efficiency of the noble metal thermocouple calibration furnace and saving the test time.

Description

Technical Field

[0001] The present invention belongs to the technical field of metrological inspection tooling, and particularly relates to a test positioning device and a test positioning method for a noble metal thermocouple calibration furnace. Background Art

[0002] A thermocouple is a thermometer made of two conductors of different materials based on the Seebeck effect. Generally, the two conductors of different materials are called the two electrodes of the thermocouple. One end of the two electrodes is welded together to form a measuring end, which is placed in the temperature field to be measured during measurement; the other end is the reference end, which is placed in a certain constant temperature field during measurement.

[0003] A thermocouple calibration furnace is an electric heating device that provides heat sources for thermocouple calibration, and is also an essential supporting device for the metrological calibration of various types of thermocouples. The temperature performance (axial temperature field, radial temperature field) of the thermocouple calibration furnace directly affects the metrological calibration accuracy of the thermocouple, and is also a key indicator for judging whether the axial temperature field and radial temperature field of the thermocouple calibration furnace meet the requirements of the regulations and specifications. According to JJF1184-2007 Thermocouple Calibration Furnace Temperature Field Test Technical Specification, the noble metal thermocouple calibration furnace needs to test its axial temperature field and radial temperature field. Currently, there are many test positioning devices for the axial temperature field test project, and the technology is relatively mature. There are relatively few test positioning devices that meet the specification requirements for the radial temperature field test project. The test positioning device is complex in design and cumbersome in operation, resulting in time-consuming and laborious testing of the radial temperature field of the noble metal thermocouple calibration furnace, low efficiency, and being unfavorable for the development of the metrological calibration work of the noble metal thermocouple. Summary of the Invention

[0004] The purpose of the present invention is to provide a test positioning device and a test positioning method for a noble metal thermocouple calibration furnace, which can well meet the test requirements of the axial temperature field and radial temperature field of the noble metal thermocouple calibration furnace, and greatly improve the test efficiency of the noble metal thermocouple calibration furnace and save the test time.

[0005] To achieve the above purpose, according to one aspect of the present application, a test positioning device for a noble metal thermocouple calibration furnace is provided, wherein the noble metal thermocouple calibration furnace includes a temperature measurement hole, the temperature measurement hole is disposed axially through the noble metal thermocouple calibration furnace, and the test positioning device for the noble metal thermocouple calibration furnace includes:

[0006] A positioning main body, the positioning main body is rotatably installed in the temperature measurement hole, and a positioning cavity is provided axially on the positioning main body;

[0007] Movable plug gauges. There are two movable plug gauges, and the two movable plug gauges are detachably installed side by side in the positioning cavity to form a first positioning hole, a second positioning hole and a third positioning hole in the positioning cavity by surrounding. The axis of the first positioning hole is consistent with the axis of the temperature measuring hole. The second positioning hole and the third positioning hole are symmetrically arranged on both sides of the first positioning hole, and the axis directions of the second positioning hole and the third positioning hole are both parallel to the axis direction of the first positioning hole. The first positioning hole, the second positioning hole and the third positioning hole are used for positioning the fixed standard couple or the movable standard couple.

[0008] Drive arm. The drive arm is connected to the positioning body, and the drive arm drives the positioning body to rotate in the temperature measuring hole under the action of an external force.

[0009] Further, the two movable plug gauges are respectively a first movable plug gauge and a second movable plug gauge.

[0010] Wherein, a first semi-circular groove is arranged on the first side of the first movable plug gauge, and a second semi-circular groove is arranged on the second side of the first movable plug gauge opposite to the first side. The first semi-circular groove is buckled on the inner wall of the positioning cavity and forms the second positioning hole with the inner wall of the positioning cavity by surrounding.

[0011] A third semi-circular groove is arranged on the first side of the second movable plug gauge, and the third semi-circular groove and the second semi-circular groove form the first positioning hole by surrounding. A fourth semi-circular groove is arranged on the second side of the second movable plug gauge opposite to the first side. The fourth semi-circular groove is buckled on the inner wall of the positioning cavity and forms the third positioning hole with the inner wall of the positioning cavity by surrounding.

[0012] Further, the test positioning device for the base metal thermocouple verification furnace further includes a locking assembly, and the locking assembly has a locking position for locking the movable plug gauge and an unlocking position for unlocking the movable plug gauge.

[0013] Further, the locking assembly includes a telescopic mechanism. The telescopic mechanism is arranged on the positioning body, and the telescopic mechanism telescopically moves along the radial direction of the positioning cavity to switch between the locking position and the unlocking position.

[0014] Further, the drive arm includes a straight section. The length direction of the straight section is parallel to the length direction of the temperature measuring hole, and a scale is arranged on the straight section.

[0015] Further, the test positioning device for the base metal thermocouple verification furnace further includes an electrical measuring instrument, and the electrical measuring instrument is used for electrically connecting with the fixed standard couple and the movable standard couple.

[0016] On the other hand, the present application also provides a test positioning method for a base metal thermocouple verification furnace. The test positioning method for the base metal thermocouple verification furnace is performed by using the above-mentioned test positioning device, and the test positioning method includes:

[0017] Step S1: Test the axial temperature field of the base metal thermocouple verification furnace in accordance with the Technical Specification for Temperature Field Test of Thermocouple Verification Furnace JJF 1184-2007;

[0018] Step S2: Test the radial temperature field of the base metal thermocouple verification furnace in accordance with the Technical Specification for Temperature Field Test of Thermocouple Verification Furnace JJF 1184-2007.

[0019] Further, the step S1 includes:

[0020] Install the fixed standard thermocouple in the first positioning hole and fix the fixed standard thermocouple at the geometric center of the base metal thermocouple verification furnace;

[0021] Install the movable standard thermocouple in the second positioning hole, and make the movable standard thermocouple move successively between -5 cm and +5 cm along the length direction of the first positioning hole with the geometric center as the 0 cm position;

[0022] Record the thermoelectric potential differences between the fixed standard thermocouple and the movable standard thermocouple at -5 cm, -4 cm, -3 cm, -2 cm, -1 cm, 0 cm, +1 cm, +2 cm, +3 cm, +4 cm and +5 cm and the thermoelectric potential difference at the "0" point, and make a round trip. Subtract the arithmetic mean of the two thermoelectric potential differences measured at the "0" point from the arithmetic mean of the two thermoelectric potential differences measured at any point by the movable standard thermocouple and the fixed standard thermocouple to obtain the thermoelectric potential value difference of the movable standard thermocouple relative to the "0" point at any point and convert it into temperature.

[0023] Further, the step S2 includes:

[0024] Make the measuring ends of the fixed standard thermocouple and the movable standard thermocouple both be located on the axial center cross-section of the base metal thermocouple verification furnace;

[0025] Apply force to the driving arm to make the positioning main body rotate in the temperature measuring hole, so that the movable standard thermocouple moves to the upper, right, lower and left four positions of the axial center cross-section, and measure and record the thermoelectric potential differences between the fixed standard thermocouple and the movable standard thermocouple at each position respectively;

[0026] Interchange the positions of the movable standard couple and the fixed standard couple, apply force to the driving arm again, so that the fixed standard couple moves to the upper, right, lower, and left four positions of the axial central cross-section, and measure and record the thermoelectric potential difference between the fixed standard couple and the movable standard couple at each position respectively;

[0027] Subtract the arithmetic mean of the two thermoelectric potential differences measured at the "0" point from the arithmetic mean of the two thermoelectric potential differences measured at any point between the movable standard couple and the fixed standard couple to obtain the thermoelectric potential value difference of the movable standard couple at any point of the upper, right, lower, and left relative to the "0" point and convert it into temperature.

[0028] Furthermore, the step of interchanging the positions of the movable standard couple and the fixed standard couple includes:

[0029] Take out the second movable plug from the positioning cavity, and move the first movable plug in the positioning cavity so that the fixed standard couple enters the position of the third positioning hole;

[0030] Insert the second movable plug into the positioning cavity and make the movable standard couple enter the position of the first positioning hole.

[0031] Applying the technical solution of the present invention, since the test positioning device in this application is provided with two movable plugs, the above two movable plugs are detachably installed in the positioning cavity, and can form the first positioning hole, the second positioning hole and the third positioning hole in the positioning cavity for positioning the fixed standard couple and the movable standard couple. During the actual radial temperature field test of the base metal thermocouple verification furnace, by changing the positions of the two movable plugs, the positions of the fixed standard couple and the movable standard couple can be quickly interchanged, which can well meet the test requirements of the axial temperature field and the radial temperature field of the base metal thermocouple verification furnace, greatly improving the test efficiency of the base metal thermocouple verification furnace and saving the test time. Description of the Drawings

[0032] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0033] Figure 1 is a perspective view of the test positioning device for the base metal thermocouple verification furnace disclosed in the embodiment of this application;

[0034] Figure 2 is a perspective view of the test positioning device for the base metal thermocouple verification furnace disclosed in the embodiment of this application when installed on the base metal thermocouple verification furnace;

[0035] Figure 3It is a side view of a test positioning device for a base metal thermocouple calibration furnace disclosed in an embodiment of the present application;

[0036] Figure 4 It is a three-dimensional structural diagram when the first movable plug and the second movable plug in the test positioning device for the base metal thermocouple calibration furnace disclosed in the embodiment of the present application are assembled together;

[0037] Figure 5 It is a flowchart of a test positioning method for a base metal thermocouple calibration furnace disclosed in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 10. Base metal thermocouple calibration furnace; 11. Temperature measurement hole; 20. Positioning main body; 21. Positioning cavity; 30. First movable plug; 31. First semi-circular groove; 32. Second semi-circular groove; 40. Second movable plug; 41. Third semi-circular groove; 42. Fourth semi-circular groove; 50. First positioning hole; 60. Second positioning hole; 70. Third positioning hole; 80. Driving arm; 81. Straight segment; 82. Scale; 100. Movable standard couple; 110. Fixed standard couple; 90. Electrical measuring instrument; 120. Locking assembly; 121. Control button. Detailed implementation manners

[0040] The following further describes the present invention in detail with reference to the drawings and specific embodiments. According to the following description and the claims, the advantages and features of the present invention will be more clear. It should be noted that the drawings are all in a very simplified form and are all applicable to non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0041] It should be noted that, in order to clearly illustrate the content of the present invention, the present invention specifically gives multiple embodiments to further illustrate different implementation manners of the present invention. Among them, the multiple embodiments are listed rather than exhaustive. In addition, for the sake of brevity of description, the content already mentioned in the previous embodiments is often omitted in the subsequent embodiments. Therefore, the content not mentioned in the subsequent embodiments can be correspondingly referred to the previous embodiments.

[0042] See Figures 1 to 4 As shown, according to an embodiment of the present application, a test positioning device for a base metal thermocouple calibration furnace is provided, hereinafter referred to as the test positioning device. The test positioning device is used to position the movable standard couple 100 and the fixed standard couple 110 during the test of the base metal thermocouple calibration furnace 10. The base metal thermocouple calibration furnace 10 in this embodiment includes a temperature measurement hole 11, and the temperature measurement hole 11 is disposed through the axial direction of the base metal thermocouple calibration furnace 10. During the actual test process, both the movable standard couple 100 and the fixed standard couple 110 are positioned in the temperature measurement hole 11 through the test positioning device.

[0043] Specifically, the test positioning device in this embodiment includes a positioning main body 20, movable chucks, and a driving arm 80. Among them, the positioning main body 20 is rotatably installed in the temperature measuring hole 11, and a positioning cavity 21 is provided in the axial direction of the positioning main body 20; there are two movable chucks, and the two movable chucks are detachably installed side by side in the positioning cavity 21 to form a first positioning hole 50, a second positioning hole 60, and a third positioning hole 70 in the positioning cavity 21 by surrounding. The axis of the first positioning hole 50 is consistent with the axis of the temperature measuring hole 11. The second positioning hole 60 and the third positioning hole 70 are symmetrically arranged on both sides of the first positioning hole 50, and the axial directions of the second positioning hole 60 and the third positioning hole 70 are both parallel to the axial direction of the first positioning hole 50. During the actual test, the first positioning hole 50, the second positioning hole 60, and the third positioning hole 70 are used to position the fixed standard couple 110 or the movable standard couple 100; the driving arm 80 is connected to the positioning main body 20, and the driving arm 80 drives the positioning main body 20 to rotate in the temperature measuring hole 11 under the action of an external force.

[0044] When it is necessary to test the base metal thermocouple verification furnace 10, first install the test positioning device in the temperature measuring hole 11 of the base metal thermocouple verification furnace 10. Thereafter, the axial temperature field and the radial temperature field of the base metal thermocouple verification furnace 10 can be tested in accordance with the JJF 1184-2007 Technical Specification for Temperature Field Testing of Thermocouple Verification Furnaces.

[0045] When testing the axial temperature field of the base metal thermocouple verification furnace 10, only need to install the fixed standard couple 110 in the first positioning hole 50 and make the fixed standard couple 110 located at the geometric center of the base metal thermocouple verification furnace 10, then install the movable standard couple 100 in the second positioning hole 60. Thereafter, move the movable standard couple 100 in the second positioning hole 60 and calculate the potential difference and convert it into temperature in accordance with the JJF 1184-2007 Technical Specification for Temperature Field Testing of Thermocouple Verification Furnaces, and then the test of the axial temperature field of the base metal thermocouple verification furnace 10 can be completed.

[0046] Thereafter, the radial temperature field of the base metal thermocouple calibration furnace 10 can be tested. At this time, the measuring ends of the fixed standard thermocouple 110 and the moving standard thermocouple 100 are both located on the axial center cross-section of the base metal thermocouple calibration furnace 10. Then, an external force is applied to the driving arm 80 to make the positioning main body 20 rotate within the temperature measurement hole 11 of the base metal thermocouple calibration furnace 10, thereby driving the moving standard thermocouple 100 within the second positioning hole 60 to move to four positions, namely, the upper, right, lower, and left positions of the axial center cross-section of the base metal thermocouple calibration furnace 10. The thermoelectric potential differences between the fixed standard thermocouple 110 and the moving standard thermocouple 100 at each position are respectively tested and measured. Thereafter, the positions of the moving standard thermocouple 100 and the fixed standard thermocouple 110 are interchanged, and the driving arm 80 is applied with force again to make the fixed standard thermocouple 110 move to the above-mentioned four positions of the axial center cross-section, and the thermoelectric potential differences between the fixed standard thermocouple 110 and the moving standard thermocouple 100 at each position are respectively measured and recorded. Finally, after calculating the potential difference according to the JJF1184-2007 Technical Specification for Testing the Temperature Field of Thermocouple Calibration Furnaces and converting it into temperature, the test of the radial temperature field of the base metal thermocouple calibration furnace 10 can be completed.

[0047] It can be understood that the meaning of interchanging the positions of the moving standard thermocouple 100 and the fixed standard thermocouple 110 in this embodiment is to make the moving standard thermocouple 100 located within the first positioning hole 50 and the fixed standard thermocouple 110 located outside the first positioning hole 50. Specifically, the fixed standard thermocouple 110 can be located within the second positioning hole 60 or within the third positioning hole 70. Since two movable plugs are provided in this embodiment, during the process of interchanging the fixed standard thermocouple 110 and the moving standard thermocouple 100, only one of the two movable plugs needs to be removed, and then the other movable plug, the fixed standard thermocouple 110, and the moving standard thermocouple 100 are pushed to move within the positioning cavity 21, and then the removed movable plug is inserted into the positioning cavity 21. That is to say, when it is necessary to interchange the positions of the fixed standard thermocouple 110 and the moving standard thermocouple 100, only the positions of the two movable slots need to be interchanged, and at the same time, the fixed standard thermocouple 110 and the moving standard thermocouple 100 are moved within the positioning cavity 21.

[0048] According to the above structure, it can be known that since the test positioning device in this embodiment is provided with two movable chucks, the above two movable chucks are detachably installed in the positioning cavity 21, and can form a first positioning hole 50, a second positioning hole 60 and a third positioning hole 70 in the positioning cavity 21 for positioning the fixed standard couple 110 and the movable standard couple 100. During the actual radial temperature field test of the base metal thermocouple calibration furnace 10, by changing the positions of the two movable chucks, the positions of the fixed standard couple 110 and the movable standard couple 100 can be quickly interchanged, which can well meet the test requirements of the axial temperature field and the radial temperature field of the base metal thermocouple calibration furnace 10, greatly improving the test efficiency of the base metal thermocouple calibration furnace and saving the test time.

[0049] Specifically, the cross-section of the positioning cavity 21 in this embodiment is a long strip cross-section, and both ends of the long strip cross-section are arc surfaces. For the convenience of distinction, in this embodiment, the two movable chucks include a first movable chuck 30 and a second movable chuck 40 respectively marked. Among them, a first semi-circular groove 31 is provided on the first side of the first movable chuck 30, and a second semi-circular groove 32 is provided on the second side of the first movable chuck 30 opposite to the first side. The first semi-circular groove 31 is buckled on the inner wall of the positioning cavity 21 and forms the second positioning hole 60 with the inner wall of the positioning cavity 21. Specifically, the first semi-circular groove 31 is buckled on the first end of the long strip cross-section and forms the above second positioning hole 60 with the arc surface at the end of the long strip cross-section; a third semi-circular groove 41 is provided on the first side of the second movable chuck 40, and the third semi-circular groove 41 and the second semi-circular groove 32 form the first positioning hole 50. A fourth semi-circular groove 42 is provided on the second side of the second movable chuck 40 opposite to the first side, and the fourth semi-circular groove 42 is buckled on the inner wall of the positioning cavity 21 and forms the above third positioning hole 70 with the inner wall of the positioning cavity 21. Specifically, the fourth semi-circular groove 42 is buckled on the second end of the long strip cross-section and forms the above third positioning hole 70 with the arc surface at the end of the long strip cross-section. With such a setting, when it is necessary to interchange the positions of the fixed standard couple 110 and the movable standard couple 100, only one of the first movable chuck 30 or the second movable chuck 40 needs to be removed, and the other movable chuck, the fixed standard couple 110 and the movable standard couple 100 located in the positioning cavity 21 are pushed along the length direction of the long strip cross-section, and then the removed movable chuck groove is reinstalled into the positioning cavity 21 and the fixed standard couple 110 and the movable standard couple 100 are fixed. The operation is simple and easy to implement.

[0050] Further, the test positioning device in this embodiment further includes a locking assembly 120, which has a locking position for locking the movable plug and an unlocking position for unlocking the movable plug. Through the action of the locking assembly 120, the movable plug can be locked in the positioning cavity 21, which can improve the use stability and reliability of the test positioning device in this embodiment.

[0051] Exemplarily, the locking assembly 120 in this embodiment includes a telescopic mechanism, which is arranged on the positioning main body 20 and telescopically extends along the radial direction of the positioning cavity 21 to switch between the locking position and the unlocking position. Optionally, the telescopic mechanism in this embodiment can be a telescopic cylinder, which is installed on the positioning main body 20. During actual operation, a control button 121 can be arranged on the positioning main body 20, and the control button 121 can control the telescopic cylinder. When the telescopic cylinder extends towards the inside of the positioning cavity 21, the movable plug can be pushed and fixed in the positioning cavity 21, with a simple structure and easy to implement.

[0052] In addition, in other embodiments of the application, the telescopic mechanism can also be a combined structure of a jacking post and a spring. During actual installation, both ends of the spring are respectively connected to the jacking post and the positioning main body 20, and the length direction of the jacking post is perpendicular to the axis direction of the positioning cavity 21. Correspondingly, a positioning hole adapted to the jacking post can be arranged on the movable plug. After the movable plug is inserted into the positioning cavity 21, the jacking post can bounce up under the action of the spring and be inserted into the positioning hole on the movable plug, thereby locking the movable plug in the positioning cavity 21, with a simple structure and easy to implement.

[0053] The above-mentioned telescopic mechanisms are only examples. As long as they are other deformation methods under the concept of this application, they are all within the protection scope of this application.

[0054] Further, a pushing member (not shown in the figure) can also be arranged in the positioning cavity 21 in this embodiment. The pushing member can be a structure such as a pushing cylinder. Through the action of the pushing member, the movable plug can be pushed out of the positioning cavity 21, with a simple structure and convenient for use and operation.

[0055] Further, the driving arm 80 in this embodiment includes a straight segment 81, the length direction of the straight segment 81 is parallel to the length direction of the temperature measuring hole 11, and a scale 82 is arranged on the straight segment 81. With such a setting, during the axial temperature field test of the base metal thermocouple calibration furnace 10, the tester can quickly move the moving standard thermocouple 100 with reference to the scale 82 on the straight segment 81, which can further improve the test efficiency of the base metal thermocouple calibration furnace 10.

[0056] Meanwhile, through the action of the driving arm 80, when it is necessary to drive the positioning main body 20 to rotate in the temperature measuring hole 11, the force-applying part of the tester can be at a certain distance from the positioning main body 20, which can avoid the safety hazard of scalding the tester during the test.

[0057] Furthermore, the test positioning device in this embodiment further includes an electrical measuring instrument 90, which is used to be electrically connected to the fixed standard couple 110 and the moving standard couple 100, and can read or calculate the detection values of the fixed standard couple 110 and the moving standard couple 100, which can improve the test efficiency of the test positioning device in this embodiment. Optionally, a changeover switch or the like can still be provided on the electrical measuring instrument 90 to select whether to read the data of the fixed standard couple 110 or the moving standard couple 100.

[0058] Combined with Figures 1 to 5 As shown, on the other hand, the embodiment of the present application also provides a test positioning method for a base metal thermocouple calibration furnace, and the test positioning method for the base metal thermocouple calibration furnace is executed by using the above-mentioned test positioning device.

[0059] Specifically, the test positioning method includes the following steps:

[0060] Step S1: Test the axial temperature field of the base metal thermocouple calibration furnace 10 in accordance with the temperature field test technical specification of JJF 1184-2007 for thermocouple calibration furnaces.

[0061] In this step, first, set the furnace temperature of the base metal thermocouple calibration furnace 10 at the test temperature point. After the furnace temperature stability meets the requirements of the regulations, install the fixed standard couple 110 in the first positioning hole 50 and make the fixed standard couple 110 fixed at the geometric center of the base metal thermocouple calibration furnace 10; then install the moving standard couple 100 in the second positioning hole 60, and make the moving standard couple 100 take the geometric center as the 0 cm position and move successively between -5 cm and +5 cm along the length direction of the first positioning hole 50. During this process, the tester can quickly move the moving standard couple 100 through the scale 82 on the driving arm 80; then record the thermoelectric potential differences between the fixed standard couple 110 and the moving standard couple 100 at -5 cm, -4 cm, -3 cm, -2 cm, -1 cm, 0 cm, +1 cm, +2 cm, +3 cm, +4 cm, and +5 cm and the thermoelectric potential difference at the "0" point. Make a round trip. Subtract the arithmetic mean of the two thermoelectric potential differences measured at the "0" point from the arithmetic mean of the two thermoelectric potential differences measured at any point between the moving standard couple 100 and the fixed standard couple 110 to obtain the thermoelectric potential value difference of the moving standard couple 100 relative to the "0" point at any point and convert it into temperature, which is the axial temperature field distribution.

[0062] Step S2: Test the radial temperature field of the base metal thermocouple calibration furnace 10 in accordance with the Technical Specification for Temperature Field Test of Thermocouple Calibration Furnace JJF 1184-2007.

[0063] After completing Step S1, proceed to Step S2. In this step, first place the measurement ends of both the fixed standard thermocouple 110 and the moving standard thermocouple 100 on the axial center cross-section of the base metal thermocouple calibration furnace 10. Then apply a force to the drive arm 80 to rotate the positioning body 20 within the temperature measurement hole 11, thereby causing the moving standard thermocouple 100 to move to the four positions of up, right, down, and left on the axial center cross-section. Measure and record the thermoelectric potential differences between the fixed standard thermocouple 110 and the moving standard thermocouple 100 at each position. Next, swap the positions of the moving standard thermocouple 100 and the fixed standard thermocouple 110, and again apply a force to the drive arm 80 to cause the fixed standard thermocouple 110 to move to the four positions of up, right, down, and left on the axial center cross-section. Measure and record the thermoelectric potential differences between the fixed standard thermocouple 110 and the moving standard thermocouple 100 at each position. Finally, subtract the arithmetic mean of the two thermoelectric potential differences measured at the "0" point from the arithmetic mean of the two thermoelectric potential differences measured at any point by the moving standard thermocouple 100 with respect to the fixed standard thermocouple 110, and convert the result into temperature. This value is the radial temperature field distribution of the axial center cross-section.

[0064] Specifically, the step of swapping the positions of the moving standard thermocouple 100 and the fixed standard thermocouple 110 includes: removing the second movable plug 40 from the positioning cavity 21, moving the first movable plug 30 within the positioning cavity 21 so that the fixed standard thermocouple 110 enters the position of the third positioning hole 70; and inserting the second movable plug 40 into the positioning cavity 21 so that the moving standard thermocouple 100 enters the position of the first positioning hole 50.

[0065] Finally, mark the center position and the test end of the temperature field on the base metal thermocouple calibration furnace 10 to complete the test.

[0066] Compared with the prior art, the present invention has the following main advantages:

[0067] (1) By using a drive arm with scales, it is possible to visually determine and monitor the moving distance of the moving standard thermocouple during the axial temperature field test, avoiding many problems such as repeated marking and inaccurate scribing during the test of different base metal thermocouple calibration furnaces.

[0068] (2) Move the movable plug on the test positioning device and make the movable plug form a first positioning hole, a second positioning hole and a third positioning hole around the positioning cavity, which can conveniently and quickly change the position during the radial temperature field test of the base metal thermocouple verification furnace, meet the test requirements of the radial temperature field in the specification. This test positioning device can meet the requirements of the specification for the test positioning device of the base metal thermocouple verification furnace, and well solves the problems such as time-consuming and laborious testing and low efficiency of the base metal thermocouple verification furnace caused by the complex design and cumbersome operation of the current test positioning device, greatly improving the test efficiency of the base metal thermocouple verification furnace and saving the test time.

[0069] For ease of description, spatial relative terms, such as "above", "on top of", "on the upper surface", "above-mentioned", etc., may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the device described as "above" or "on top of" another device or structure will then be positioned "below" or "beneath" the other device or structure. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0070] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above words have no special meaning, and thus should not be construed as limiting the protection scope of the present application.

[0071] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A test positioning device for a base metal thermocouple verification furnace, wherein, The base metal thermocouple calibration furnace (10) includes a temperature measurement hole (11) which is disposed through the axial direction of the base metal thermocouple calibration furnace (10). It is characterized in that the test positioning device for the base metal thermocouple calibration furnace includes: A positioning main body (20) which is rotatably installed in the temperature measurement hole (11), and a positioning cavity (21) is arranged in the axial direction of the positioning main body (20); Movable chocks, there are two movable chocks, and the two movable chocks are detachably installed side by side in the positioning cavity (21) to form a first positioning hole (50), a second positioning hole (60) and a third positioning hole (70) in the positioning cavity (21). The axis of the first positioning hole (50) is consistent with the axis of the temperature measurement hole (11). The second positioning hole (60) and the third positioning hole (70) are symmetrically arranged on both sides of the first positioning hole (50), and the axis directions of the second positioning hole (60) and the third positioning hole (70) are both parallel to the axis direction of the first positioning hole (50). The first positioning hole (50), the second positioning hole (60) and the third positioning hole (70) are used for positioning the fixed standard couple (110) or the movable standard couple (100); A driving arm (80) which is connected to the positioning main body (20), and the driving arm (80) drives the positioning main body (20) to rotate in the temperature measurement hole (11) under the action of an external force.

2. The test positioning device for a base metal thermocouple calibration furnace according to claim 1, characterized in that, The two movable chocks are respectively a first movable chock (30) and a second movable chock (40), Wherein, a first semi-circular groove (31) is arranged on the first side of the first movable chock (30), and a second semi-circular groove (32) is arranged on the second side of the first movable chock (30) opposite to the first side. The first semi-circular groove (31) is buckled on the inner wall of the positioning cavity (21) and forms the second positioning hole (60) with the inner wall of the positioning cavity (21); A third semi-circular groove (41) is arranged on the first side of the second movable chock (40), the third semi-circular groove (41) and the second semi-circular groove (32) form the first positioning hole (50), and a fourth semi-circular groove (42) is arranged on the second side of the second movable chock (40) opposite to the first side. The fourth semi-circular groove (42) is buckled on the inner wall of the positioning cavity (21) and forms the third positioning hole (70) with the inner wall of the positioning cavity (21).

3. The test positioning device for the base metal thermocouple calibration furnace according to claim 1, characterized in that, The test positioning device for the base metal thermocouple calibration furnace further includes a locking assembly (120), and the locking assembly (120) has a locking position for locking the movable chocks and an unlocking position for unlocking the movable chocks.

4. The test positioning device for a base metal thermocouple calibration furnace according to claim 3, characterized in that, The locking assembly (120) includes a telescopic mechanism disposed on the positioning body (20). The telescopic mechanism telescopically moves radially along the positioning cavity (21) to switch between the locked position and the unlocked position.

5. The test positioning device for the noble metal thermocouple calibration furnace according to claim 1, characterized in that, The driving arm (80) includes a straight segment (81). The length direction of the straight segment (81) is parallel to the length direction of the temperature measurement hole (11), and a scale (82) is provided on the straight segment (81).

6. The test positioning device for the noble metal thermocouple calibration furnace according to claim 1, characterized in that, The test positioning device for the base metal thermocouple verification furnace further includes an electrical measuring instrument (90) for electrically connecting to the fixed standard thermocouple (110) and the moving standard thermocouple (100).

7. A test positioning method for a base metal thermocouple calibration furnace, characterized in that, The test positioning method for the base metal thermocouple verification furnace is performed using the test positioning device according to any one of claims 1 to 6. The test positioning method includes: Step S1: Test the axial temperature field of the base metal thermocouple verification furnace (10) in accordance with the temperature field test technical specification of JJF 1184-2007 for thermocouple verification furnaces. Step S2: Test the radial temperature field of the base metal thermocouple verification furnace (10) in accordance with the temperature field test technical specification of JJF 1184-2007 for thermocouple verification furnaces.

8. The test positioning method for a base metal thermocouple calibration furnace according to claim 7, characterized in that, The step S1 includes: Install the fixed standard thermocouple (110) in the first positioning hole (50) and fix the fixed standard thermocouple (110) at the geometric center of the base metal thermocouple verification furnace (10). Install the moving standard thermocouple (100) in the second positioning hole (60), and make the moving standard thermocouple (100) move sequentially between -5 cm and +5 cm along the length direction of the first positioning hole (50) with the geometric center as the 0 cm position. Record the thermoelectric potential differences between the fixed standard thermocouple (110) and the moving standard thermocouple (100) at -5 cm, -4 cm, -3 cm, -2 cm, -1 cm, 0 cm, +1 cm, +2 cm, +3 cm, +4 cm, and +5 cm and the thermoelectric potential difference at the "0" point, and make a round trip. Subtract the arithmetic mean of the two thermoelectric potential differences measured at the "0" point from the arithmetic mean of the two thermoelectric potential differences measured at any point of the moving standard thermocouple (100) and the fixed standard thermocouple (110) to obtain the thermoelectric potential value difference of the moving standard thermocouple (100) relative to the "0" point and convert it into temperature.

9. The test positioning method for the noble metal thermocouple calibration furnace according to claim 7, characterized in that The step S2 includes: Make the measuring ends of the fixed standard thermocouple (110) and the moving standard thermocouple (100) both be on the axial center cross-section of the base metal thermocouple verification furnace (10). Apply a force to the driving arm (80) to rotate the positioning body (20) in the temperature measurement hole (11), so that the moving standard thermocouple (100) moves to the upper, right, lower, and left four positions of the axial center cross-section, and measure and record the thermoelectric potential differences between the fixed standard thermocouple (110) and the moving standard thermocouple (100) at each position respectively. Interchange the positions of the moving standard couple (100) and the fixed standard couple (110), and apply force to the driving arm (80) again so that the fixed standard couple (110) moves to the four positions of up, right, down, and left on the axial center cross-section, and measure and record the thermoelectric potential differences between the fixed standard couple (110) and the moving standard couple (100) at each position respectively; Subtract the arithmetic mean of the thermoelectric potential differences measured twice at the "0" point from the arithmetic mean of the thermoelectric potential differences measured twice at any point between the moving standard couple (100) and the fixed standard couple (110) to obtain the thermoelectric potential value difference of the moving standard couple (100) at any point of up, right, down, and left relative to the "0" point, and convert it into temperature.

10. The test positioning method for a noble metal thermocouple calibration furnace according to claim 9, characterized in that The steps of interchanging the positions of the moving standard couple (100) and the fixed standard couple (110) include: Take out the second movable plug (40) from the positioning cavity (21), and move the first movable plug (30) in the positioning cavity (21) so that the fixed standard couple (110) enters the position of the third positioning hole (70); Insert the second movable plug (40) into the positioning cavity (21) and make the moving standard couple (100) enter the position of the first positioning hole (50).

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