Cooling mechanism and thermal deformation softening point temperature tester

Abstract

The utility model provides a cooling mechanism and a thermal deformation softening point temperature measuring instrument, which comprise a liquid containing tank with an opening at the top end, and a liquid inlet and a liquid outlet are respectively arranged on the liquid containing tank; the liquid containing tank is used for containing a high-temperature medium in which a to-be-tested sample is immersed; a middle cavity corresponding to the liquid outlet and a storage cavity containing a low-temperature medium and corresponding to the liquid inlet are formed behind the liquid change cooling section, and the liquid change cooling section is used for enabling the high-temperature medium in the liquid containing tank to flow into the middle cavity after the previous batch of samples to be tested are tested and before the next batch of samples to be tested are tested; and the low-temperature medium in the storage cavity is conveyed into the liquid containing tank. According to the cooling mechanism and the thermal deformation softening point temperature tester provided by the utility model, after the liquid containing tank with the open top end and the liquid changing cooling section are arranged, a high-temperature medium can be completely discharged and then a low-temperature medium is injected after a batch of samples are detected, so that the temperature cross contamination is prevented, the test precision is improved, the liquid changing process replaces the traditional natural cooling, and the test efficiency is improved. The detection efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of testing instrument technology, specifically relating to a cooling mechanism and a thermal deformation softening point temperature measuring instrument. Background Technology

[0002] The cooling mechanism and heat distortion softening point temperature measuring instrument are precision testing devices used to measure the temperature characteristics of polymer materials, such as plastics, rubber, coatings, and asphalt, as they deform or soften under constant load and temperature increase. By applying a constant load (bending stress or compressive stress) to the sample and increasing the temperature at a constant rate, the deformation of the sample during the heating process is observed, and the temperature at which the specified deformation value is reached is determined, which is the heat distortion temperature or Vicat softening point temperature.

[0003] In existing technologies, when determining the heat distortion softening point temperature of materials, the sample is typically placed on two supports to form a simple beam structure, with a constant load applied at the midpoint of the sample, or the sample is placed vertically with a constant load applied at the midpoint above the sample. The sample is then immersed in a heat transfer medium (such as silicone oil or liquid paraffin) and heated at a constant rate. However, cooling mechanisms and heat distortion softening point temperature measuring instruments usually lack cooling devices, resulting in slow cooling times. After each test, it is necessary to wait for the oil in the medium tank to cool naturally, which greatly prolongs the interval between experiments, severely reduces experimental efficiency, and fails to meet the needs of modern high-efficiency testing. This approach is also characterized by poor adaptability and practicality. Utility Model Content

[0004] This utility model provides a cooling mechanism and a heat distortion softening point temperature measuring instrument, which aims to solve the problem of poor practicality caused by the low testing efficiency of the cooling methods used in existing cooling mechanisms and heat distortion softening point temperature measuring instruments.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a cooling mechanism, comprising:

[0006] A liquid-holding tank with an open top is provided with an inlet and an outlet; the liquid-holding tank is used to hold a high-temperature medium into which the test sample is immersed.

[0007] After the liquid exchange cooling section, there is an intermediate cavity corresponding to the liquid outlet, and a storage cavity containing a low-temperature medium corresponding to the liquid inlet. The liquid exchange cooling section is used to allow the high-temperature medium in the liquid tank to flow into the intermediate cavity after the previous batch of test samples is tested and before the next batch of test samples is tested, and to transport the low-temperature medium in the storage cavity to the liquid tank.

[0008] In one possible implementation, the fluid exchange cooling section includes:

[0009] Dynamic structure;

[0010] The heat medium tank is connected to the liquid outlet via the power structure, and the inner cavity of the heat medium tank is the intermediate cavity;

[0011] A spare medium tank is connected to the liquid inlet via the power structure, and the inner cavity of the spare medium tank is the storage cavity;

[0012] The cooling unit is connected to the heat transfer tank and the power structure;

[0013] The heat medium tank is connected to the spare medium tank via the power structure;

[0014] The power structure is used to provide power for the flow of the medium.

[0015] In one possible implementation, the power structure includes:

[0016] The valve island has four sets of inlet and outlet connection positions. Each set of inlet and outlet connection positions is respectively connected to the liquid tank and the heat medium tank, the heat medium tank and the spare medium tank, the heat medium tank and the cooling unit, and the spare medium tank and the liquid tank. The valve island is used to control the opening and closing of each of the inlet and outlet connection positions.

[0017] A reversible pump, poweredly connected to the valve island, is used to transport media when the valve island opens or closes the corresponding inlet / outlet connection positions.

[0018] In one possible implementation, the cooling unit is a heat exchanger.

[0019] This utility model also provides a heat distortion softening point temperature measuring instrument, the heat distortion softening point temperature measuring instrument comprising:

[0020] The experimental box has an experimental chamber;

[0021] A cooling mechanism, wherein a liquid-holding tank is located at the bottom of the experimental chamber, and an experimental platform is provided inside the liquid-holding tank within the experimental chamber;

[0022] A load generating mechanism is fixed inside the experimental chamber and located above the experimental platform. The load generating mechanism has a load applying part that extends vertically downward toward the sample.

[0023] In one possible implementation, the experimental box includes:

[0024] The box body has an inner cavity that is the experimental chamber, and the box body also has an operating port that is connected to the experimental chamber.

[0025] The sample holders are provided in multiple ways, and each sample holder is arranged at intervals in the liquid tank along the extension direction of the liquid tank. The multiple sample holders together constitute the experimental platform.

[0026] An opening and closing door can be installed at the operating opening of the experimental chamber. The opening and closing door is provided with an observation window. The opening and closing door is used to seal the experimental chamber during the experiment.

[0027] In one possible implementation, the load generating mechanism includes:

[0028] A horizontal slide rail is provided inside the experimental chamber and fixed to the top of the box body. The horizontal slide rail is provided along the extension direction of the liquid tank.

[0029] A sliding seat is slidably disposed on the horizontal slide rail along the extending direction of the liquid-containing tank;

[0030] A horizontal actuator is used to drive the sliding seat to slide along the extension direction of the liquid-containing tank;

[0031] A load actuator, disposed on the sliding seat, the load actuator having a load application end extending downward in a vertical direction,

[0032] The experimental block is detachably connected to the load application end of the load driver, and the experimental block is used to apply a constant load to the corresponding pattern on the pattern holder.

[0033] In one possible implementation, the experimental chamber further includes a cover plate that covers the opening of the liquid-containing tank.

[0034] In one possible implementation, the heat distortion softening point temperature measuring instrument further includes a matching controller, which is electrically connected to the load generating mechanism and the cooling mechanism, and is used to control the operation of the load generating mechanism and the cooling mechanism.

[0035] In one possible implementation, the heat distortion softening point temperature measuring instrument further includes a control panel, which is mounted on the experimental chamber and electrically connected to the matching controller.

[0036] Compared with existing technologies, this implementation method, by setting up a liquid-holding tank with an open top and a liquid-changing cooling section, allows the high-temperature medium to be completely drained and then the low-temperature medium to be injected after a batch of samples has been tested, preventing cross-contamination of temperatures and improving test accuracy. The liquid-changing process replaces the traditional natural cooling, improving test efficiency. There is no need to wait for the medium to cool down, and the next batch of experiments can be carried out immediately. It has high test efficiency, good adaptability, and good practicality. Attached Figure Description

[0037] Figure 1A schematic diagram illustrating the working principle of the cooling mechanism provided in this embodiment of the utility model;

[0038] Figure 2 A schematic diagram of the structure of the heat distortion softening point temperature measuring instrument provided in the embodiment of this utility model;

[0039] Figure 3 A schematic diagram of the internal structure of the heat distortion softening point temperature measuring instrument provided in an embodiment of this utility model;

[0040] Figure 4 A side view of the internal structure of the heat distortion softening point temperature measuring instrument provided in an embodiment of this utility model;

[0041] Explanation of reference numerals in the attached figures:

[0042] 10. Cooling mechanism; 11. Liquid tank; 12. After-cooling section; 121. Power structure; 1211. Valve island; 1212. Reversible pump; 122. Heat medium tank; 123. Spare medium tank; 124. Cooling unit; 20. Heat deformation softening point temperature measuring instrument; 21. Experimental chamber; 211. Experimental cavity; 212. Chamber body; 213. Sample rack; 214. Opening door; 2141. Observation window; 22. Load generating mechanism; 221. Horizontal slide rail; 222. Sliding seat; 223. Horizontal actuator; 224. Load actuator; 225. Experimental block; 23. Cover plate; 24. Control panel. Detailed Implementation

[0043] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0044] It should be noted that the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", and "tail" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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, they should not be construed as limitations on this utility model.

[0045] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of a structure. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0047] Please refer to the following: Figures 1 to 4 The cooling mechanism 10 and the heat distortion softening point temperature measuring instrument 20 provided by this utility model will now be described. The cooling mechanism 10 includes a liquid holding tank 11 and a liquid replacement cooling section 12. The liquid holding tank 11 is open at the top and has an inlet and an outlet. The liquid holding tank 11 is used to hold the high-temperature medium into which the test sample is immersed. The liquid replacement cooling section 12 has an intermediate cavity corresponding to the outlet and a storage cavity containing a low-temperature medium corresponding to the inlet. The liquid replacement cooling section 12 is used to allow the high-temperature medium in the liquid holding tank 11 to flow into the intermediate cavity after the previous batch of test samples is tested and before the next batch of test samples is tested, and to transport the low-temperature medium in the storage cavity to the liquid holding tank 11.

[0048] Compared with the prior art, the cooling mechanism 10 provided in this embodiment is equipped with a liquid-holding tank 11 with an open top and a liquid-changing cooling section 12. After a batch of samples is tested, the high-temperature medium can be completely discharged before the low-temperature medium is injected, which prevents temperature cross-contamination and improves test accuracy. The liquid-changing process replaces the traditional natural cooling, which improves the test efficiency. There is no need to wait for the medium to cool down, and the next batch of experiments can be carried out immediately. The test efficiency is high, the adaptability is good, and the practicality is good.

[0049] Physical isolation between high-temperature and low-temperature media is achieved through independent intermediate and storage chambers, avoiding temperature fluctuations caused by mixing.

[0050] In some embodiments, the above-mentioned fluid exchange cooling section 12 can adopt the following... Figure 1 The structure shown. See also Figure 1The cooling system 12 after the fluid exchange includes: a power structure 121, a heat transfer medium tank 122, a spare heat transfer medium tank 123, and a cooling unit 124. The power structure 121 connects the heat transfer medium tank 122 to the outlet, and its inner cavity is an intermediate cavity. The spare heat transfer medium tank 123 connects to the inlet via the power structure 121, and its inner cavity is a storage cavity. The cooling unit 124 is connected to both the heat transfer medium tank 122 and the power structure 121.

[0051] The heat medium tank 122 is connected to the spare medium tank 123 via the power structure 121.

[0052] The power structure 121 is used to provide power for the flow of the medium.

[0053] After the high-temperature medium flows into the hot medium tank 122, it is cooled by the cooling unit 124 and can be reused for subsequent tests, reducing the cost of medium consumption. The hot medium tank 122 and the spare medium tank 123 are set up independently, which facilitates maintenance and replacement and improves equipment reliability. The modular design of the hot medium tank 122, the spare medium tank 123 and the cooling unit 124 forms a closed-loop system to realize the recycling of the medium. Each component can be disassembled and replaced independently. For example, the cleaning cycle of the hot medium tank 122 can be extended from once a week in traditional equipment to once a month. The number of spare medium tanks 123 can be increased according to the testing requirements to realize multi-temperature gradient testing.

[0054] In some embodiments, the aforementioned power structure 121 may adopt the following... Figure 1 The structure shown. See also Figure 1 The power structure 121 includes a valve island 1211 and a reversible pump 1212. The valve island 1211 has four sets of inlet and outlet connection positions, each corresponding to a liquid tank 11 and a hot medium tank 122, a hot medium tank 122 and a spare medium tank 123, a hot medium tank 122 and a cooling unit 124, and a spare medium tank 123 and a liquid tank 11, respectively. The valve island 1211 controls the opening and closing of each inlet and outlet connection position. The reversible pump 1212 is poweredly connected to the valve island 1211 and is used to transport the medium when the valve island 1211 opens or closes the corresponding inlet and outlet connection positions.

[0055] The combination of valve island 1211 and reversible pump 1212 enables multi-path fluid control and simplifies pipeline structure. Four sets of pipelines require only one pump to complete bidirectional delivery, reducing volume by 30% compared to traditional multi-pump systems and resulting in a more compact footprint. Reduced pump power requirements and a solenoid valve control response time of <0.1 seconds eliminate human error, lowering equipment failure rate by 60%.

[0056] Valve Island 1211 is an integrated valve control device that combines multiple solenoid valves through a modular design to achieve centralized control of multiple fluid channels. Each solenoid valve in Valve Island 1211 controls an independent fluid channel, and the valve core is driven by electromagnetic force to open and close the channel.

[0057] In some embodiments, the cooling unit 124 may employ, for example... Figure 1 The structure shown. See also Figure 1 Cooling unit 124 is a heat exchanger.

[0058] A heat exchanger is used as the cooling unit 124 to achieve efficient heat exchange. The heat exchanger rapidly cools the high-temperature medium through a heat exchange medium (such as water or air). A plate heat exchanger can be used; it is a highly efficient heat exchange device that uses closely spaced metal plates to form flow channels, enabling heat transfer between two media. A target temperature can be set, and the heat exchanger can be adjusted in real time to ensure that the temperature fluctuation of the low-temperature medium in the spare medium tank 123 is ≤±0.5℃.

[0059] Based on the same inventive concept, this utility model embodiment also provides a heat distortion softening point temperature measuring instrument 20, which can employ, for example... Figures 1 to 4 The structure shown. See also Figures 1 to 4 The heat distortion softening point temperature measuring instrument 20 includes: an experimental chamber 21, a cooling mechanism 10, and a load generating mechanism 22. The experimental chamber 21 has an experimental cavity 211. The liquid tank 11 in the cooling mechanism 10 is located at the bottom of the experimental cavity 211, and an experimental platform is provided inside the liquid tank 11. The load generating mechanism 22 is fixed inside the experimental cavity 211 and located above the experimental platform. The load generating mechanism 22 has a load application part that extends vertically downward toward the sample.

[0060] All components are integrated within the test chamber 21, forming a compact and efficient testing system. This integrated design organically combines core components such as the cooling mechanism 10 and the load generation mechanism 22, significantly reducing the number of external piping connections. In previous distributed layouts, numerous exposed pipes not only increased system complexity but also made the system prone to media leakage due to the large number of interfaces. This was especially problematic under high-temperature and high-pressure testing environments, where leaks could pose safety hazards or cause test interruptions. By integrating the piping inside the test chamber 21, coupled with high-precision sealing technology and standardized interface design, the risk of media leakage is significantly reduced, while also making the equipment's appearance simpler and more organized, facilitating operation and maintenance.

[0061] The load generating mechanism 22 is precisely positioned directly above the specimen, a design that ensures the accuracy of load application from a mechanical perspective. In the testing of the softening point of materials due to thermal deformation, the perpendicularity of the load is crucial. If the load application is eccentric, the specimen will be subjected to a lateral force, leading to tilting or displacement during the test, resulting in significant testing errors and affecting the judgment of the material's true properties. By precisely aligning the load applying part of the load generating mechanism 22 directly above the center of the specimen and employing rigid connections and guiding mechanisms (such as linear guides and ball screws), the load is ensured to be transmitted vertically to the specimen surface without deviation. This vertical loading method not only meets the requirements of relevant testing standards but also allows the specimen to deform under uniform axial pressure, thereby obtaining more reliable and representative test data and effectively improving the accuracy and credibility of the experimental results.

[0062] In some embodiments, the above-mentioned experimental chamber 21 can be adopted as follows: Figures 2 to 4 The structure shown. See also Figures 2 to 4 The experimental chamber 21 includes: a chamber body 212, sample racks 213, and a door 214. The inner cavity of the chamber body 212 is the experimental chamber 211, and the chamber body 212 also has an operating port that communicates with the experimental chamber 211. Multiple sample racks 213 are provided, spaced apart along the extension direction of the liquid tank 11, and the multiple sample racks 213 together constitute the experimental platform. The door 214 can cover the operating port of the experimental chamber 211, and the door 214 has an observation window 2141. The door 214 is used to seal the experimental chamber 211 during experiments.

[0063] The experimental platform inside the experimental chamber 21 adopts a multi-sample rack design, allowing multiple samples to be placed at once according to testing needs. The sample racks are evenly spaced along the extension direction of the liquid tank 11, forming a standardized testing station. This parallel testing mode overcomes the limitation of traditional equipment that can only test a single sample at a time, making it particularly suitable for quality screening or comparative experiments of batch materials. For example, in polymer material research and development, samples with different formulations can be tested simultaneously, and heat distortion data can be obtained concurrently, significantly shortening the experimental cycle and greatly improving efficiency compared to traditional single-sample testing. Each sample rack adopts a modular design, allowing for quick disassembly and replacement to accommodate samples of different specifications (such as plate, column, and sheet shapes), further enhancing the equipment's versatility.

[0064] The experimental chamber 21 features a large observation window 2141 embedded in its hinged door 214. This window is made of high-temperature resistant, anti-fog double-layered tempered glass, with an anti-reflective film coated on the inner glass surface, ensuring clear observation of the sample's condition within the experimental chamber 211 under varying lighting conditions. The observation window 2141 enables "non-contact" real-time monitoring, allowing operators to observe the entire process of sample deformation under load in a high-temperature medium via a high-definition camera or direct visual inspection without frequent opening and closing of the experimental chamber 211. This design effectively avoids temperature fluctuations in the experimental chamber 211 caused by frequent openings in traditional operations (a single opening can cause a 5-10°C drop in temperature, requiring reheating for equilibration), ensuring a temperature stability error of ≤±0.5°C during testing. Furthermore, reducing the number of openings lowers the risk of external dust, moisture, and other impurities entering the experimental chamber 211, maintaining a clean testing environment and further improving data reliability. With a built-in high-definition industrial camera and image analysis software, it can record dynamic data of sample deformation in real time and automatically measure the deformation through image recognition technology, realizing fully digital monitoring and analysis of the testing process. The opening and closing mechanism of the door 214 can adopt a linkage structure, which can move the door 214 upwards while moving towards the experimenter, reducing the opening and closing trajectory of the door 214 and facilitating operation by the experimenter.

[0065] In some embodiments, the load generating mechanism 22 described above may employ, for example... Figure 3 , Figure 4 The structure shown. See also Figure 3 , Figure 4 The load generating mechanism 22 includes: a horizontal slide rail 221, a sliding seat 222, a horizontal actuator 223, a load actuator 224, and an experimental block 225. The horizontal slide rail 221 is disposed within the experimental chamber 211 and fixed to the top of the housing body 212, extending along the direction of the liquid tank 11. The sliding seat 222 is slidably disposed on the horizontal slide rail 221 along the direction of the liquid tank 11. The horizontal actuator 223 drives the sliding seat 222 to slide along the direction of the liquid tank 11. The load actuator 224 is disposed on the sliding seat 222 and has a load application end extending downwards in a vertical direction. The experimental block 225 is detachably connected to the load application end of the load actuator 224 and is used to apply a constant load to the sample on the corresponding sample holder 213.

[0066] It can automatically position and load, and the horizontal driver 223 drives the sliding seat 222 to move along the sample holder, so that each sample can be loaded in sequence without manual adjustment.

[0067] In some embodiments, the above-mentioned experimental chamber 21 can be adopted as follows: Figure 4 The structure shown. See also Figure 4The experimental chamber 21 also includes a cover plate 23, which covers the opening of the liquid tank 11.

[0068] The cover plate 23 at the top of the liquid tank 11 adopts a multi-layer composite structure design, with the inner layer being a high-temperature resistant material, the outer layer being a stainless steel protective plate, and the middle layer being filled with an air insulation layer, forming a highly efficient thermal barrier system.

[0069] The protective function of the cover plate 23 is reflected in multiple dimensions: First, when the high-temperature medium (such as silicone oil) in the liquid tank 11 splashes due to boiling or impact, the cover plate 23 can effectively block the splashing of droplets and prevent the operator from being burned by the high-temperature medium. Second, the closed space formed by the cover plate 23 can inhibit the volatilization of the medium and reduce the diffusion of harmful gases (such as volatile organic compounds produced by decomposition at high temperatures). In conjunction with the ventilation system of the experimental chamber 21, the concentration of harmful gases in the chamber can be controlled below the safe threshold. Third, during the liquid change process, the cover plate 23 can prevent the medium from splashing due to pipeline pressure fluctuations. Especially at the moment of start-up and shutdown of the reversible pump 1212, the buffering effect of the cover plate 23 can reduce the impact intensity of the liquid flow, protect the safety of the operator and the equipment surface from corrosion.

[0070] In some embodiments, the above-mentioned heat distortion softening point temperature measuring instrument 20 can be adopted as follows: Figure 2 The structure shown. See also Figure 2 The heat distortion softening point temperature measuring instrument 20 also includes a matching controller, which is electrically connected to the load generating mechanism 22 and the cooling mechanism 10, and is used to control the operation of the load generating mechanism 22 and the cooling mechanism 10.

[0071] One-click start of the entire testing process reduces manual intervention, and data is automatically recorded to avoid human error.

[0072] In some embodiments, the above-mentioned heat distortion softening point temperature measuring instrument 20 can be adopted as follows: Figure 2 , Figure 3 The structure shown. See also Figure 2 , Figure 3 The heat distortion softening point temperature measuring instrument 20 also includes a control panel 24, which is set on the experimental box 21 and is electrically connected to the matching controller.

[0073] The user interface is intuitive, reducing training costs. An emergency stop button is included to enhance safety.

[0074] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cooling mechanism, characterized in that, include: A liquid-holding tank with an open top, wherein the liquid-holding tank is provided with an inlet and an outlet; The liquid-holding tank is used to hold the high-temperature medium into which the test sample is immersed; After the liquid exchange cooling section, there is an intermediate cavity corresponding to the liquid outlet, and a storage cavity containing a low-temperature medium corresponding to the liquid inlet. The liquid exchange cooling section is used to allow the high-temperature medium in the liquid tank to flow into the intermediate cavity after the previous batch of test samples is tested and before the next batch of test samples is tested, and to transport the low-temperature medium in the storage cavity to the liquid tank.

2. The cooling mechanism as described in claim 1, characterized in that, The fluid exchange cooling section includes: Dynamic structure; The heat medium tank is connected to the liquid outlet via the power structure, and the inner cavity of the heat medium tank is the intermediate cavity; A spare medium tank is connected to the liquid inlet via the power structure, and the inner cavity of the spare medium tank is the storage cavity; The cooling unit is connected to the heat transfer tank and the power structure; The heat medium tank is connected to the spare medium tank via the power structure; The power structure is used to provide power for the flow of the medium.

3. The cooling mechanism as described in claim 2, characterized in that, The power structure includes: The valve island has four sets of inlet and outlet connection positions. Each set of inlet and outlet connection positions is respectively connected to the liquid tank and the heat medium tank, the heat medium tank and the spare medium tank, the heat medium tank and the cooling unit, and the spare medium tank and the liquid tank. The valve island is used to control the opening and closing of each of the inlet and outlet connection positions. A reversible pump, poweredly connected to the valve island, is used to transport media when the valve island opens or closes the corresponding inlet / outlet connection positions.

4. The cooling mechanism as described in claim 2, characterized in that, The cooling unit is a heat exchanger.

5. A heat distortion softening point temperature measuring instrument, characterized in that, include: The experimental box has an experimental chamber; The cooling mechanism according to any one of claims 1-4, wherein the liquid-containing tank in the cooling mechanism is located at the bottom of the experimental chamber, and the experimental chamber is provided with an experimental platform disposed in the liquid-containing tank; A load generating mechanism is fixed inside the experimental chamber and located above the experimental platform. The load generating mechanism has a load applying part that extends vertically downward toward the sample.

6. The heat distortion softening point temperature measuring instrument as described in claim 5, characterized in that, The experimental chamber includes: The box body has an inner cavity that is the experimental chamber, and the box body also has an operating port that is connected to the experimental chamber. The sample holders are provided in multiple ways, and each sample holder is arranged at intervals in the liquid tank along the extension direction of the liquid tank. The multiple sample holders together constitute the experimental platform. An opening and closing door can be installed at the operating opening of the experimental chamber. The opening and closing door is provided with an observation window. The opening and closing door is used to seal the experimental chamber during the experiment.

7. The heat distortion softening point temperature measuring instrument as described in claim 6, characterized in that, The load generating mechanism includes: A horizontal slide rail is provided inside the experimental chamber and fixed to the top of the box body. The horizontal slide rail is provided along the extension direction of the liquid tank. A sliding seat is slidably disposed on the horizontal slide rail along the extending direction of the liquid-containing tank; A horizontal actuator is used to drive the sliding seat to slide along the extension direction of the liquid-containing tank; A load actuator, disposed on the sliding seat, the load actuator having a load application end extending downward in a vertical direction, The experimental block is detachably connected to the load application end of the load driver, and the experimental block is used to apply a constant load to the corresponding pattern on the pattern holder.

8. The heat distortion softening point temperature measuring instrument as described in claim 5, characterized in that, The experimental chamber also includes a cover plate, which is placed over the opening of the liquid tank.

9. The heat distortion softening point temperature measuring instrument as described in claim 5, characterized in that, The heat distortion softening point temperature measuring instrument also includes a matching controller, which is electrically connected to the load generating mechanism and the cooling mechanism, and is used to control the operation of the load generating mechanism and the cooling mechanism.

10. The heat distortion softening point temperature measuring instrument as described in claim 9, characterized in that, The heat distortion softening point temperature measuring instrument also includes a control panel, which is mounted on the experimental chamber and electrically connected to the matching controller.

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