Temperature measuring device for inner wall of small-bore metal pipe during heat treatment

Abstract

The application discloses a built-in thermocouple temperature measuring device for the inner wall of a small-caliber metal pipe in a heat treatment process, which comprises a stretching mechanism and a fixing mechanism; the thermocouple is installed on the stretching mechanism; and the stretching mechanism is connected to the fixing mechanism. The built-in thermocouple temperature measuring device can be used for pre-burying a thermocouple in the inner wall of a small-caliber metal pipe (such as a square pipe, a rectangular pipe, a round pipe or an elliptical pipe) with a diameter of less than or equal to 70 mm, so as to measure the temperature change and the uniformity of the inner wall of the metal pipe in the heat treatment process, and the heat treatment process and equipment of the small-caliber metal pipe can be optimized to the maximum extent, and finally high-performance metal pipes can be obtained.

Description

Technical Field

[0001] This invention relates to metal heat treatment technology, and more specifically, to an internal wall embedded temperature measuring device suitable for the heat treatment process of small-diameter metal pipes. Background Technology

[0002] A good heat treatment process can greatly improve the performance of metallic materials. Therefore, based on the current market demand for high-strength metal tubes, various companies are optimizing and improving their heat treatment processes. Among these, heating and cooling are the two most critical process steps. To optimize the process, it is necessary to verify the improved equipment and process (temperature) regime. Therefore, it is necessary to embed thermocouples in the metal tubes to measure the real-time temperature changes of the metal tubes under different heat treatment process parameters.

[0003] However, for small-diameter (especially ≤70mm) metal tubes with a closed circumferential cross-section (square, rectangular, round, or elliptical tubes), the welding head of a thermocouple spot welding machine cannot reach deep into the interior of the slender tube. Therefore, it is impossible to weld the thermocouple to the inner wall of the slender tube, and thus impossible to measure the temperature change and uniformity of the inner wall of the small-diameter metal tube during heat treatment. Currently, there is no relevant technology for measuring the temperature of the inner wall of small-diameter metal tubes. Summary of the Invention

[0004] To address the aforementioned deficiencies in existing technologies, the present invention aims to provide an internal thermocouple temperature measurement device suitable for the heat treatment process of small-diameter metal pipes. By applying tightening or loosening operations to the outer end of the pipe, this device is driven to open and adhere tightly to the inner wall or loosen inside the pipe. Therefore, thermocouples can be pre-embedded deep within the inner wall of small-diameter (especially ≤70mm) metal pipes (square, rectangular, round, or elliptical pipes, etc.) to measure the temperature change and anisotropic uniformity of the inner wall of the metal pipe during heat treatment. This allows for the optimization of the heat treatment process and equipment for small-diameter metal pipes to the greatest extent possible, ultimately resulting in the production of high-performance metal pipes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An internal wall embedded temperature measuring device suitable for heat treatment of small-diameter metal pipes, comprising an extension mechanism and a fixing mechanism;

[0007] The thermocouple is mounted on the extension mechanism;

[0008] The extension mechanism is connected to the fixing mechanism.

[0009] Preferably, the extension mechanism comprises two sets of movable parallelogram structures.

[0010] Preferably, the quadrilateral structure is formed by four hinged plates connected end to end.

[0011] Preferably, the hinge plates are connected by the same pin at their connection points.

[0012] Preferably, the fixing mechanism includes a guide sleeve and a nut disposed on the same side end of the pin in a relative position, and a bolt inserted into the guide sleeve and the nut.

[0013] Preferably, a sleeve is fitted onto the pin.

[0014] The thermocouple is mounted on the sleeve.

[0015] Preferably, a washer is fitted on the bolt, and the spring washer is close to the guide sleeve (the washer is placed between the nut 3 and the bolt 5 for locking the bolt).

[0016] Preferably, the fixing mechanism includes a main frame;

[0017] A perforation is made at the center of the main frame;

[0018] The inner side of the main frame is provided with multiple hanging holes at equal intervals around the perforation.

[0019] Preferably, the stretching mechanism includes a wing plate, a bolt, a splitting pressure head, and a nut;

[0020] The tail of the bolt is inserted through the through hole from the front side of the main frame, and the bolt head is in contact with the front side of the main frame.

[0021] The slitting head and the nut are both screwed onto the bolt, and the slitting head is close to the inner side of the main frame;

[0022] One end of the wing plate is connected to the hanging hole via a pin, and the number of wing plates corresponds to the number of hanging holes.

[0023] The thermocouple is mounted on the other end of the wing.

[0024] Preferably, the cross-section of the sheet-forming head is cylindrical, square, or rectangular;

[0025] The bolt head is provided with a hexagonal head or an internal hexagonal cylindrical bolt.

[0026] This invention provides an internal embedded thermocouple temperature measuring device suitable for the heat treatment process of small-diameter metal pipes. It can be used for various pipe fittings, including rectangular (square, flat), round, and elliptical pipes, and is particularly suitable for small-diameter pipe fittings. By using this internal embedded thermocouple temperature measuring device, in conjunction with thermocouples welded to the outer surface of the metal pipe, temperature changes at various points inside and outside the pipe can be measured and compared in subsequent heat treatment experiments. This allows for the improvement of the process and equipment, ultimately leading to the optimal heat treatment process and equipment. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of Embodiment 1 of the internal wall embedded temperature measuring device of the present invention;

[0028] Figure 2 This is a front view schematic diagram of Embodiment 1 of the internal wall embedded temperature measuring device of the present invention;

[0029] Figure 3 This is a three-dimensional schematic diagram of Embodiment 2 of the internal wall embedded temperature measuring device of the present invention;

[0030] Figure 4 This is a front view schematic diagram of Embodiment 2 of the internal wall embedded temperature measuring device of the present invention;

[0031] Figure 5 This is a schematic diagram of the main frame in Embodiment 2 of the internal wall embedded temperature measuring device of the present invention. Detailed Implementation

[0032] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] The present invention provides an internal wall embedded temperature measuring device suitable for the heat treatment process of small-diameter metal pipes, comprising an extension mechanism and a fixing mechanism.

[0034] Thermocouple 100 is mounted on the extension mechanism, which is connected to the fixing mechanism.

[0035] Combination Figure 1 and Figure 2 This is a schematic diagram of Embodiment 1 of the internal wall embedded temperature measuring device of the present invention. The extension mechanism includes two sets of movable quadrilateral structures.

[0036] Both sets of quadrilateral structures are composed of four hinged plates connected end to end, and the two sets of parallelogram structures are symmetrically arranged.

[0037] Furthermore, the hinge plates 1 are connected by the same pin 2.

[0038] The fixing mechanism includes a guide sleeve 3 and a nut 4 located on the same side of the pin 2 at opposite positions (i.e., at the two opposite corners of the quadrilateral), and a bolt 5 inserted into the guide sleeve 3 (the washer is placed between the nut 3 and the bolt 5 to lock the bolt. The guide sleeve 3 can also be a nut with the same thread specification as the nut 4) and the nut 4.

[0039] A sleeve 6 is fitted on the pin 2, and the sleeve 6 is located between the hinge plates 1. The thermocouple 100 is installed on the sleeve 6.

[0040] A washer 7 is fitted on bolt 5, and washer 7 is attached between guide sleeve 3 and bolt head.

[0041] Embodiment 1 of the inner wall embedded thermocouple temperature measuring device of the present invention is based on the instability principle of parallelograms. It can be extended deep into the tube to directly press the thermocouple 100 onto the inner wall of the tube, so as to press and solidify the thermocouple 100 on the inner wall of the tube and realize real-time temperature measurement throughout the heat treatment process experiment.

[0042] A parallelogram structure is formed by using a hinge plate 1, and the upper and lower sets of thermocouples 100 are wound around the two diagonal sleeves 6 of the quadrilateral.

[0043] The entire inner wall embedded thermocouple temperature measuring device of the present invention, in embodiment 1, is inserted deep into the metal tube. When the bolt 5 is tightened, the distance between the guide sleeve 3 and the nut 4 at the other two diagonal points of the quadrilateral is shortened, causing the quadrilateral to change. The two sleeves 6 on which thermocouples 100 are installed are pushed away, pressing the thermocouples 100 tightly against the inner wall of the metal tube (e.g., ...). Figure 2 (As shown by the middle arrow), this allows for the actual measurement of the inner wall temperature of the metal tube.

[0044] After the temperature measurement is completed, loosen bolt 5 and gently pull it out to remove the entire inner wall embedded temperature measuring device of embodiment 1 from the tube.

[0045] Bolt 5 can be an internal hex bolt, which should be tightened and loosened using an extended internal hex wrench. Alternatively, a hex head bolt can be used, which should be tightened and loosened using an extended socket wrench.

[0046] Embodiment 1 of the inner wall embedded thermocouple temperature measuring device of the present invention can fix two sets of thermocouples 100 at the same time, that is, measure two opposite points; when it is necessary to measure two other points in the tube, another set of mechanisms can be used, that is, the extension mechanism can be rotated 90° and fixed.

[0047] See again Figure 1 and Figure 2 In Embodiment 1 of the internal wall embedded thermocouple temperature measuring device of the present invention, a slender tube is first erected, and the entire device is inserted deep into the tube using a soft rope. Then, an extended wrench is used to tighten the bolt 5, which completes the contact and compression of the two sets of thermocouples 100 on the inner wall of the tube. Combined with the thermocouples welded to the outer surface of the metal tube, the metal tube can then be sent to a heat treatment experimental area for heat treatment process and / or equipment verification and optimization experiments. After the experiment is completed, the extended socket wrench is used to loosen the bolt 5, and the entire internal wall embedded thermocouple temperature measuring device of Embodiment 1 can be removed for future use.

[0048] It is best to use a torque wrench for bolt 5 to prevent excessive tightening force from breaking the thermocouple 100.

[0049] Combination Figures 3 to 5The diagram shows an embodiment 2 of the internal wall embedded temperature measuring device of the present invention. The fixing mechanism includes a main frame 8, a through hole 9 is opened at the center of the main frame 8, and a plurality of hanging holes 10 are provided at equal intervals around the through hole 9 on the inner side of the main frame 8. The number of hanging holes 10 can be set to 4.

[0050] The extension mechanism includes a wing plate 11, a bolt 12, a splitting pressure head 13, and a nut 14.

[0051] The tail of bolt 12 is inserted through the through hole 9 from the front side of the main frame 8, and the bolt head of bolt 12 is in contact with the front side of the main frame 8.

[0052] The slitting head 13 and nut 14 are screwed onto the bolt 12 in sequence, with the slitting head 13 on the inner side of the main frame 8.

[0053] One end of the wing plate 11 is connected to the hanging hole 10 via a pin 15. There are 4 wing plates, corresponding to the number of hanging holes 10.

[0054] Thermocouple 100 is mounted on the other end of wing 11.

[0055] The second embodiment of the internal wall embedded temperature measuring device of the present invention uses a main frame 8 as the main body, and uses pins 15 to connect each openable and retractable wing plate 11 to each of its hanging holes 10.

[0056] A thermocouple 100 for temperature measurement is welded onto the wing plate 11. The arc surface at the end of the wing plate 11 is used to press the thermocouple 100 onto the inner wall of the metal tube later.

[0057] Insert bolt 12 into the main frame 8, insert the tensioning head 13 and spring washer 16 into bolt 12, and finally install nut 14.

[0058] An extended hexagonal head 17 can be welded to the hexagonal head end of bolt 12 so that it can be tightened or loosened with an extended socket wrench after the entire device has been inserted deep into the long tube.

[0059] The entire internal wall embedded thermocouple temperature measuring device of the present invention, in embodiment 2, is inserted deep into the metal tube. Extended socket wrenches are used to align the hexagonal head 17 and nut 14 from both sides of the tube. As the nut 14 is gradually tightened, the splitting pressure head 13 is pushed to open the wing plate 11, simultaneously pressing the four thermocouples 100 against the inner wall of the metal tube. This allows for the actual measurement of the inner wall temperature of the metal tube.

[0060] After the temperature measurement is completed, loosen nut 14 and gently pull it out to remove the temperature measuring mechanism from the tube.

[0061] When the sizing head 13 is cylindrical or a cuboid with a square cross-section, each flange 11 will open synchronously (at the same angle) as the sizing head 13 is pressed, which is suitable for round tubes or square tubes. When the cross-sectional shape of the sizing head 13 is changed, for example, when the cross-section of the sizing head 13 is changed to a rectangle, the opening angle of each flange 11 will be asynchronous as the sizing head 13 is pressed. In this case, it is suitable for pressing the thermocouple 100 synchronously against the inner wall of an elliptical tube or a flat tube (rectangular tube) with a non-square cross-section.

[0062] See again Figures 3 to 5 Using an extended socket wrench, the entire internal wall embedded thermocouple temperature measuring device of embodiment 2 of the present invention is inserted deep into the pipe. Then, the nuts are tightened from both ends using the extended wrench against the hexagonal head 17 and the nut 14. This completes the contact and compression of multiple sets of thermocouples 100 on the inner wall of the pipe. Combined with the thermocouples welded to the outer surface of the metal pipe, the metal pipe can then be sent to the heat treatment experimental area for heat treatment process and / or equipment verification and optimization experiments. After the experiment is completed, the nut 14 is loosened again using the extended socket wrench, and the entire internal wall embedded thermocouple temperature measuring device of embodiment 2 of the present invention can be removed for future use.

[0063] It is best to use a torque wrench to tighten nut 14 to prevent excessive tightening force from breaking thermocouple 100.

[0064] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. An internal wall embedded temperature measuring device suitable for heat treatment of small-diameter metal pipes, characterized in that: Includes extension mechanisms and fixing mechanisms; The thermocouple is mounted on the extension mechanism; The extension mechanism is connected to the fixing mechanism. The fixing mechanism includes a main frame; A perforation is made at the center of the main frame; The inner side of the main frame is provided with multiple hanging holes at equal intervals around the perforation; The extension mechanism includes a wing plate, bolts, a tensioning head, and nuts; The tail of the bolt is inserted through the through hole from the front side of the main frame, and the bolt head is in contact with the front side of the main frame. The slitting head and the nut are both screwed onto the bolt, and the slitting head is close to the inner side of the main frame; One end of the wing plate is connected to a hanging hole via a pin, and the number of wing plates corresponds to the number of hanging holes; the thermocouple is mounted on the other end of the wing plate. The cross-section of the slitting head is cylindrical, square, or rectangular; The bolt head is provided with a hexagonal head or an internal hexagonal cylindrical bolt.

2. The embedded thermocouple temperature measuring device for the inner wall of small-diameter metal pipes according to claim 1, characterized in that: The extension mechanism includes two sets of movable parallelogram structures.

3. The internal wall embedded temperature measuring device for heat treatment of small-diameter metal pipes according to claim 2, characterized in that: The parallelogram structure is composed of four hinged plates connected end to end.

4. The embedded thermocouple temperature measuring device for the inner wall of small-diameter metal pipes according to claim 3, characterized in that: The hinge plates are connected by the same pin at their joint positions.

5. The embedded thermocouple temperature measuring device for the inner wall of small-diameter metal pipes according to claim 4, characterized in that: The fixing mechanism includes a guide sleeve and a nut located on the same side of the pin shaft, and a bolt inserted into the guide sleeve and the nut.

6. The embedded thermocouple temperature measuring device for the inner wall of small-diameter metal pipes according to claim 4, characterized in that: A sleeve is fitted onto the pin; The thermocouple is mounted on the sleeve.

7. The embedded thermocouple temperature measuring device for the inner wall of small-diameter metal pipes according to claim 5, characterized in that: A washer is fitted onto the bolt, and the washer is close to the guide sleeve.

Images