Material thermodynamic property experimental instrument

Abstract

The utility model relates to the technical field of experimental instruments, in particular to a material thermodynamic property experimental instrument, which comprises a cover body, an extension measuring mechanism and a pressure detecting mechanism, the cover body is internally provided with a bracket for assembling and disassembling a metal pipe fitting to be detected, and the extension measuring mechanism and the pressure detecting mechanism are respectively abutted against two ends of the metal pipe fitting to be detected. And the temperature control mechanism is used for being conducted with the metal pipe fitting to be tested. According to the utility model, experimental measurement of different performance parameters can be carried out, and the experimental efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of experimental instruments, and more specifically, to a material thermodynamic property testing instrument. Background Technology

[0002] In the field of materials science and engineering, the thermodynamic properties of materials, such as the coefficient of linear expansion and Young's modulus, are key indicators for evaluating the reliability of materials under actual working conditions. Currently, measuring these performance parameters requires the use of different experimental instruments for separate measurements. For example, a metal linear expansion coefficient tester is used to measure the thermal expansion behavior of materials under temperature changes, or a Young's modulus tester is used to test the elastic deformation characteristics of materials under mechanical loads. This means that if different performance parameters of a metal sample are to be measured, different experimental instruments must be used, resulting in cumbersome experimental procedures, low experimental efficiency, and difficulty in flexibly carrying out different experimental projects. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing experimental instruments with limited functionality and to provide a material thermodynamic property testing instrument that can perform experimental measurements of different performance parameters, thereby improving experimental efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A material thermodynamic property testing instrument is provided, including a cover, a bracket for loading and unloading a metal pipe to be tested, an elongation measuring mechanism and a pressure testing mechanism for respectively abutting the two ends of the metal pipe to be tested, and a temperature control mechanism for being in communication with the metal pipe to be tested.

[0006] This utility model discloses a material thermodynamic property testing instrument. The support frame allows for the placement of the metal tube under test within a housing. When the temperature of the metal tube is controlled by a temperature control mechanism, the elongation of the metal tube under test can be measured via an elongation measuring mechanism located at the first end of the metal tube, enabling the linear expansion coefficient experiment. Furthermore, the pressure of the metal tube under test can be measured via a pressure detection mechanism located at the second end of the metal tube, enabling the Young's modulus experiment, thus improving experimental efficiency. The housing design reduces heat loss during transmission, improving experimental accuracy.

[0007] Preferably, the elongation measuring mechanism includes a displacement measuring element and a first position adjusting structure. The measuring end of the displacement measuring element faces the first end of the metal pipe to be measured. The displacement measuring element is connected to the adjusting end of the first position adjusting structure. The first position adjusting structure can drive the displacement measuring element to reciprocate along the extension direction of the metal pipe to be measured.

[0008] Preferably, the first position adjustment structure includes a first support, a first sliding member slidably connected to the first support, and the displacement measuring member is connected to the first sliding member; it also includes a first adjusting member, which is slidably inserted into the first support, with the adjusting end of the first adjusting member facing the first sliding member.

[0009] Preferably, the first support has a receiving cavity, the first sliding member is disposed in the receiving cavity, and the first support has a first sliding groove communicating with the receiving cavity; the first position adjustment structure further includes a locking structure, the working end of the locking structure is connected to the first sliding member through the first sliding groove, and the operating end of the locking structure is located outside the receiving cavity.

[0010] Preferably, the displacement measuring device is a dial indicator or a laser interferometer.

[0011] Preferably, the pressure detection mechanism includes a pressure sensor, a display, and a second position adjustment structure. The pressure sensor is communicatively connected to the display, and the sensing end of the pressure sensor faces the second end of the metal pipe to be tested. The pressure sensor is connected to the adjustment end of the second position adjustment structure, which can drive the pressure sensor to reciprocate along the extension direction of the metal pipe to be tested.

[0012] Preferably, the temperature control mechanism includes a constant temperature water tank and a temperature controller communicatively connected to the constant temperature water tank; the metal pipe to be tested has a first guide port and a second guide port on the side wall near both ends, the outlet and inlet of the constant temperature water tank are respectively connected to a first pipe and a second pipe, the first pipe and the second pipe are respectively connected to the first guide port and the second guide port; the pipe walls of the first pipe and the second pipe are both provided with a heat insulation layer.

[0013] Preferably, the material thermodynamic property testing instrument further includes a drainage mechanism connected to the constant temperature water tank; wherein, the drainage mechanism includes a collection bucket and a third pipe, the collection bucket being connected to the constant temperature water tank through the third pipe, and the third pipe being provided with a drain valve.

[0014] Preferably, the material thermodynamic property testing instrument further includes a base, the support is a fixed frame connected to the base, the elongation measuring mechanism and the pressure detection mechanism are both installed on the base, and the metal pipe to be tested is detachably installed on the fixed frame; the base is also provided with a limiting groove, and the cover is detachably inserted into the limiting groove.

[0015] Preferably, the cover has an opening, and the two ends of the cover are respectively provided with a first notch and a second notch that communicate with the opening. The measuring end of the elongation measuring mechanism and the detection end of the pressure detection mechanism abut against the two ends of the metal pipe to be tested through the first notch and the second notch, respectively. The cover is a transparent cover.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The support can be used to place the metal pipe under test inside the enclosure. When the temperature control mechanism is used to regulate the temperature of the metal pipe under test, the elongation of the metal pipe under test can be measured by the elongation measuring mechanism located at the first end of the metal pipe under test, so as to realize the linear expansion coefficient experiment; it can also be used by the pressure detection mechanism located at the second end of the metal pipe under test to detect the pressure of the metal pipe under test, so as to realize the Young's modulus experiment, thereby improving the experimental efficiency; the enclosure can reduce the heat loss during the transmission process and improve the accuracy of the experiment.

[0018] 2. The setting of the first position adjustment structure can be used to adjust the distance between the displacement measuring component and the metal pipe to be tested, which facilitates the linear expansion coefficient experiment; and when the displacement measuring component is adjusted to be far away from the metal pipe to be tested by the first position adjustment structure, the material thermodynamic property tester can independently perform the Young's modulus experiment, different experimental items can be flexibly carried out, and the utilization rate of the test instrument can be improved.

[0019] 3. The setting of the second position adjustment structure can be used to adjust the distance between the pressure sensor and the metal pipe to be tested, which facilitates the Young's modulus test; and when the pressure sensor is adjusted to be far away from the metal pipe to be tested by the second position adjustment structure, the material thermodynamic property tester can conduct the linear expansion coefficient test alone, different test items can be carried out flexibly, and the utilization rate of the test instrument can be improved.

[0020] 4. The drainage mechanism can be used to drain water from the constant temperature water tank that does not meet the current temperature requirement. Then, by adding water that meets the current temperature requirement to the constant temperature water tank and applying it to the metal pipe to be tested, the experimental efficiency can be improved. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the material thermodynamic property testing instrument of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the metal pipe fitting to be tested, the elongation measuring mechanism, and the pressure testing mechanism of this utility model;

[0023] Figure 3This is a schematic diagram of the elongation measuring mechanism of this utility model;

[0024] Figure 4 This is a schematic diagram of the pressure detection mechanism of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the cover of this utility model;

[0026] Figure 6 This is a schematic diagram of the third embodiment of the material thermodynamic property testing instrument of this utility model.

[0027] In the attached diagram: 100, cover; 110, first notch; 120, second notch; 130, opening; 140, through hole; 200, metal pipe to be tested; 210, first through port; 220, second through port; 300, elongation measuring mechanism; 310, displacement measuring component; 320, first support; 321, first slide groove; 322, second slide groove; 330, first sliding component; 340, first adjusting component; 350, locking structure; 400, pressure detection mechanism; 410, pressure sensing component. ; 420, Display unit; 421, Connecting wire; 430, Second support; 431, Third slide rail; 432, Stand; 440, Second slider; 450, Second adjusting screw; 500, Constant temperature water tank; 510, First pipe; 520, Second pipe; 530, Cover; 600, Temperature controller; 610, Control circuit; 700, Drainage mechanism; 710, Collection bucket; 720, Third pipe; 730, Drain valve; 800, Base; 810, Fixing frame; 820, Limiting groove. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Example 1

[0031] like Figures 1 to 5 The first embodiment of the material thermodynamic property testing instrument of this utility model is shown. It includes a cover 100, a bracket for loading and unloading the metal tube 200 to be tested is provided inside the cover 100, an elongation measuring mechanism 300 and a pressure detection mechanism 400 for abutting the first end and the second end of the metal tube 200 to be tested, respectively, and a temperature control mechanism for being in communication with the metal tube 200 to be tested.

[0032] The support can be used to place the metal pipe 200 under test 200 inside the cover 100. When the temperature control mechanism is used to regulate the temperature of the metal pipe 200 under test, the elongation of the metal pipe 200 under test can be measured by the elongation measuring mechanism 300 located at the first end of the metal pipe 200 under test, so as to realize the linear expansion coefficient experiment. It can also be used by the pressure detection mechanism 400 located at the second end of the metal pipe 200 under test to detect the pressure of the metal pipe 200 under test, so as to realize the Young's modulus experiment, thereby improving the experimental efficiency. The cover 100 can reduce the heat loss during the transmission process and improve the accuracy of the experiment.

[0033] like Figure 1 and Figure 2As shown, this utility model also includes a base 800, a support frame 810 connected to the base 800, an elongation measuring mechanism 300 and a pressure detection mechanism 400 both mounted on the base 800, and a metal tube 200 to be tested detachably mounted on the support frame 810; the base 800 also has a limiting groove 820, and the cover 100 is detachably inserted into the limiting groove 820. In this embodiment, the support frame 810 includes a fixed seat and a clamping seat detachably connected to the fixed seat. The fixed seat has a first arc-shaped recess, and the clamping seat has a second arc-shaped recess corresponding to the first arc-shaped recess. When the clamping seat is connected to the fixed seat, the first arc-shaped recess and the second arc-shaped recess can stably position the metal tube 200 to be tested on the base 800, improving the accuracy of the experiment. Specifically, one or more fixing brackets 810 can be set. When one fixing bracket 810 is set, the fixing bracket 810 is used to fix the middle part of the metal pipe fitting 200 to be tested. When multiple fixing brackets 810 are set, the multiple fixing brackets 810 can be distributed at equal intervals.

[0034] It should be noted that, in order for the elongation measuring mechanism 300 and the pressure testing mechanism 400 to abut against the metal pipe fitting 200 under test, both ends of the metal pipe fitting 200 under test are closed, that is, the first end and the second end of the metal pipe fitting 200 under test have a first end face and a second end face for abutment, respectively. In this embodiment, the metal pipe fitting 200 under test can be one of copper metal pipe, aluminum pipe, or stainless steel pipe.

[0035] like Figures 1 to 3 As shown, the elongation measuring mechanism 300 includes a displacement measuring element 310 and a first position adjustment structure. The measuring end of the displacement measuring element 310 faces the first end of the metal tube 200 to be measured. The displacement measuring element 310 is connected to the adjustment end of the first position adjustment structure, which can drive the displacement measuring element 310 to reciprocate along the extension direction of the metal tube 200 to be measured. The first position adjustment structure includes a first support 320 connected to the base 800 and a first sliding element 330 slidably connected to the first support 320. The displacement measuring element 310 is connected to the first sliding element 330. It also includes a first adjusting element 340, which is slidably inserted into the first support 320, with the adjustment end of the first adjusting element 340 facing the first sliding element 330.

[0036] Specifically, the first support 320 has a receiving cavity, the first sliding member 330 is a first slider that slides in the receiving cavity, the side of the first support 320 has a first sliding groove 321 that communicates with the receiving cavity, the top of the first support 320 has a second sliding groove 322 that communicates with the receiving cavity, the displacement measuring member 310 is placed on the top of the first support 320, and the first slider is connected to the bottom of the displacement measuring member 310 through the second sliding groove 322.

[0037] Specifically, the first position adjustment structure also includes a locking structure 350. In this embodiment, the working end of the locking structure 350 is a connecting screw, and the operating end is a nut. The connecting screw is inserted into the receiving cavity through the first slide groove 321 and connected to the first slider. The nut is connected to the connecting screw and located outside the first slide groove 321. Tightening the nut on the connecting screw can limit the position of the displacement measuring element 310. In this embodiment, the first slide groove 321 can be opened on one side or both sides of the first support 320. It should be noted that the connection between the connecting screw and the first slider can be fixed or detachable. When the connection between the connecting screw and the first slider is detachable, by setting the second slide groove 322 to communicate with one end of the first support 320, the displacement measuring element 310 can be taken out through the second slide groove 322, the displacement measuring element 310 can be separated from the first support 320, and the displacement measuring element 310 can be replaced.

[0038] In this embodiment, the first adjusting member 340 is a first adjusting screw, which is threadedly connected to the other end of the first support 320. The first adjusting screw can extend into the receiving cavity and abut against the first slider. Rotating the first adjusting screw allows for fine-tuning of the position of the displacement measuring member 310. It should be noted that the first adjusting screw can also be connected to the first slider via a bearing seat, which also allows for fine-tuning of the position of the displacement measuring member 310. In this embodiment, the displacement measuring member 310 is a dial indicator or a laser interferometer; preferably, a dial indicator is selected in this embodiment.

[0039] like Figure 1 , Figure 2 and Figure 4As shown, the pressure detection mechanism 400 includes a pressure sensor 410, a display 420, and a second position adjustment structure. The pressure sensor 410 and the display 420 are connected via a connecting wire 421. The sensing end of the pressure sensor 410 faces the second end of the metal pipe 200 to be tested. The pressure sensor 410 is connected to the adjustment end of the second position adjustment structure, which can drive the pressure sensor 410 to reciprocate along the extension direction of the metal pipe 200 to be tested. In this embodiment, the second position adjustment structure includes a second support 430 connected to the base 800. The second support 430 is provided with a third sliding groove 431, and a second slider 440 is slidably connected to the third sliding groove 431. The pressure sensor 410 is connected to the second slider 440. The second support 430 is also connected to a stand 432, and a second adjusting screw 450 is connected to the stand 432. The second adjusting screw 450 and the second slider 440 can be in abutment, or they can be connected through a bearing seat, so that the pressure sensor 410 can achieve fine-tuning of its position feed by rotating the second adjusting screw 450. Specifically, the pressure sensor 410 is a pressure sensor, and the display 420 is a pressure / tension display.

[0040] like Figure 1 and Figure 2 As shown, the temperature control mechanism includes a constant temperature water tank 500 and a temperature controller 600, which are connected via a control circuit 610. The metal pipe 200 under test has a first through-hole 210 and a second through-hole 220 on its side walls near both ends, and both through-holes 210 and 220 are connected to the interior of the metal pipe 200. The outlet and inlet of the constant temperature water tank 500 are connected to a first pipe. 510 and 520 are connected to the first and second conduits, respectively, and are connected to the first and second openings, 210 and 220, respectively. In this embodiment, a water pump is connected to the first pipe 510. After the water pump is started, water in the constant temperature water tank 500 can flow into the metal fitting 200 under test through the first pipe 510 and the first conduit 210, and then flow back to the constant temperature water tank 500 through the second conduit 220 and the second pipe 520. To further reduce heat loss during transmission, the walls of both the first pipe 510 and the second pipe 520 are provided with insulation layers; specifically, the insulation layers can be achieved by thickening the pipe walls. In this embodiment, the temperature controller 600 is a PID temperature controller.

[0041] like Figure 1 and Figure 5As shown, the cover 100 has an opening 130, and the limiting groove 820 is adapted to the opening 130. The two ends of the cover 100 are respectively provided with a first notch 110 and a second notch 120 communicating with the opening 130. The measuring end of the elongation measuring mechanism 300 and the sensing end of the pressure sensing mechanism 400 abut against the two ends of the metal pipe 200 to be tested through the first notch 110 and the second notch 120, respectively. In this embodiment, the two ends of the metal pipe 200 to be tested can be configured to extend out of the first notch 110 and the second notch 120, respectively, for abutting against the displacement measuring element 310 and the pressure sensing element 410; alternatively, the measuring end of the displacement measuring element 310 can be configured to extend into the cover 100 through the first notch 110 and abut against the first end of the metal pipe 200 to be tested, and the sensing end of the pressure sensing element 410 can be configured to extend into the cover 100 through the second notch 120 and abut against the second end of the metal pipe 200 to be tested. The cover 100 is also provided with two through holes 140, through which the first pipe 510 and the second pipe 520 can respectively extend into the cover 100 and communicate with the metal pipe 200 to be tested.

[0042] The working principle of the material thermodynamic property testing instrument in this embodiment is as follows:

[0043] S1. Loosen the locking screw of the micrometer, turn the first adjusting screw to make the contact of the micrometer close to the first end face of the metal pipe 200 to be measured, and observe the position indicated by the long pointer of the micrometer. Make sure there is a certain pre-tightening force between the contact and the first end face, such as a pre-tightening force in the range of one to one and a half turns. Then turn the locking screw of the micrometer to fix it in the pre-adjusted position. At this time, the locking structure 350 can also be locked to further improve the positional stability of the micrometer.

[0044] S2. Turn on the display 420, turn the second adjusting screw 450 to move the pressure sensor position so that the sensing end of the pressure sensor is in close contact with the second end face of the metal pipe 200 to be tested; continue to turn the second adjusting screw 450 and observe the pressure value of the display 420, so that there is a certain preload between the pressure sensor and its end face, such as a preload of 0.45~0.55kg; then zero the display 420.

[0045] S3. Fill the constant temperature water tank 500 with water, turn on the constant temperature water tank 500 and the temperature controller 600, and set the temperature controller 600 according to the required temperature for the experiment. The temperature controller 600 can heat the constant temperature water tank 500. While the water in the constant temperature water tank 500 is being heated, it can continuously circulate in the metal pipe 200 under test. The cover 100 can effectively reduce the temperature dissipation of the circulating water in the metal pipe 200 under test, ensuring the constant experimental temperature, and can also effectively prevent the experimenters from being scalded by the high temperature of the metal pipe 200 under test. When the PID temperature controller controls the water temperature to reach the set temperature, it will stop heating.

[0046] It should be noted that:

[0047] When it is necessary to conduct a separate experiment on the coefficient of linear expansion, the pressure sensor is moved away from the metal tube 200 under test by adjusting the second adjusting screw 450 or by sliding the second slider 440. Then, steps S1 and S3 are executed. After heating is stopped, the amount of linear expansion of the metal tube 200 under test is recorded on the dial indicator.

[0048] When it is necessary to conduct Young's modulus test separately, the dial indicator is moved away from the metal tube 200 to be tested by adjusting the first adjusting screw or by sliding the first slider. Then, steps S2 and S3 are performed. After heating is stopped, the expansion stress of the metal tube 200 to be tested is read from the display 420.

[0049] When it is necessary to conduct experiments on the coefficient of linear expansion and Young's modulus simultaneously, steps S1, S2, and S3 are executed, and the results are recorded simultaneously using a dial indicator and a display meter 420.

[0050] Furthermore, the temperature of the temperature controller 600 can be repeatedly adjusted according to the requirements of the experimental operation manual to further increase the temperature of the circulating water in the constant temperature water tank 500. The above steps are repeated to record the linear expansion and expansion stress in different temperature ranges.

[0051] Example 2

[0052] This embodiment is a second embodiment of a material thermodynamic property testing instrument. This embodiment is similar to the first embodiment, except that the cover 100 can be set as a transparent cover, which facilitates observation. Specifically, the cover 100 can be a heat-insulating glass cover.

[0053] Example 3

[0054] This embodiment is the third embodiment of a material thermodynamic property testing instrument. This embodiment is similar to Embodiment 1 or 2, except that, as Figure 6As shown, the material thermodynamic property testing instrument also includes a drainage mechanism 700 connected to the constant temperature water tank 500; wherein, the drainage mechanism 700 includes a collection bucket 710 and a third pipe 720, the collection bucket 710 being connected to the drain end of the constant temperature water tank 500 through the third pipe 720, and the third pipe 720 also having a drain valve 730. In this embodiment, the constant temperature water tank 500 may also be provided with a cover 530, which facilitates the filling of water into the constant temperature water tank 500.

[0055] The working principle of the material thermodynamic property testing instrument in this embodiment is as follows:

[0056] After completing the current experiment, by opening the drain valve 730, all the hot water in the constant temperature water tank 500 is drained into the collection bucket 710. Then, the drain valve 730 is closed, and cold water is injected into the constant temperature water tank 500 and allowed to flow into the metal pipe 200 to be tested. This allows for rapid cooling of both the constant temperature water tank 500 and the metal pipe 200 to be tested, preparing the equipment for subsequent experiments and improving experimental efficiency.

[0057] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A thermodynamic property testing apparatus for materials, characterized in that, It includes a cover (100), which is provided with a bracket for loading and unloading the metal pipe (200) to be tested, and also includes an elongation measuring mechanism (300) and a pressure detection mechanism (400) for respectively abutting against both ends of the metal pipe (200) to be tested, and a temperature control mechanism for communicating with the metal pipe (200) to be tested.

2. The material thermodynamic property testing apparatus according to claim 1, characterized in that, The elongation measuring mechanism (300) includes a displacement measuring element (310) and a first position adjustment structure. The measuring end of the displacement measuring element (310) faces the first end of the metal pipe (200) to be measured. The displacement measuring element (310) is connected to the adjustment end of the first position adjustment structure. The first position adjustment structure can drive the displacement measuring element (310) to reciprocate along the extension direction of the metal pipe (200) to be measured.

3. The material thermodynamic property testing apparatus according to claim 2, characterized in that, The first position adjustment structure includes a first support (320) and a first sliding member (330) slidably connected to the first support (320). The displacement measuring member (310) is connected to the first sliding member (330). It also includes a first adjusting member (340), which is slidably inserted into the first support (320). The adjusting end of the first adjusting member (340) faces the first sliding member (330).

4. The material thermodynamic property testing apparatus according to claim 3, characterized in that, The first support (320) is provided with a receiving cavity, the first sliding member (330) is provided in the receiving cavity, and the first support (320) is provided with a first sliding groove (321) communicating with the receiving cavity; the first position adjustment structure further includes a locking structure (350), the working end of the locking structure (350) is connected to the first sliding member (330) through the first sliding groove (321), and the operating end of the locking structure (350) is located outside the receiving cavity.

5. The material thermodynamic property testing apparatus according to claim 2, characterized in that, The displacement measuring device (310) is a dial indicator or a laser interferometer.

6. The material thermodynamic property testing apparatus according to claim 1, characterized in that, The pressure detection mechanism (400) includes a pressure sensor (410), a display (420), and a second position adjustment structure. The pressure sensor (410) is communicatively connected to the display (420). The sensing end of the pressure sensor (410) faces the second end of the metal pipe (200) to be tested. The pressure sensor (410) is connected to the adjustment end of the second position adjustment structure. The second position adjustment structure can drive the pressure sensor (410) to reciprocate along the extension direction of the metal pipe (200) to be tested.

7. The material thermodynamic property testing apparatus according to any one of claims 1 to 6, characterized in that, The temperature control mechanism includes a constant temperature water tank (500) and a temperature controller (600) that is communicatively connected to the constant temperature water tank (500); the metal pipe fitting (200) to be tested is provided with a first guide port (210) and a second guide port (220) on the side wall near both ends; the outlet end and the inlet end of the constant temperature water tank (500) are respectively connected to a first pipe (510) and a second pipe (520); the first pipe (510) and the second pipe (520) are respectively connected to the first guide port (210) and the second guide port (220); the pipe walls of the first pipe (510) and the second pipe (520) are both provided with a heat insulation layer.

8. The material thermodynamic property testing apparatus according to claim 7, characterized in that, It also includes a drainage mechanism (700) connected to the constant temperature water tank (500); wherein the drainage mechanism (700) includes a collection bucket (710) and a third pipe (720), the collection bucket (710) is connected to the constant temperature water tank (500) through the third pipe (720), and the third pipe (720) is also provided with a drain valve (730).

9. The material thermodynamic property testing apparatus according to any one of claims 1 to 6, characterized in that, It also includes a base (800), the bracket is a fixed frame (810) connected to the base (800), the elongation measuring mechanism (300) and the pressure detection mechanism (400) are both installed on the base (800), and the metal pipe to be tested (200) is detachably installed on the fixed frame (810); the base (800) is also provided with a limiting groove (820), and the cover (100) is detachably inserted into the limiting groove (820).

10. The material thermodynamic property testing apparatus according to any one of claims 1 to 6, characterized in that, The cover (100) has an opening (130), and the two ends of the cover (100) are respectively provided with a first notch (110) and a second notch (120) that are connected to the opening (130). The measuring end of the elongation measuring mechanism (300) and the detection end of the pressure detection mechanism (400) are respectively connected to the two ends of the metal pipe (200) to be tested through the first notch (110) and the second notch (120); the cover (100) is a transparent cover.

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