Sample supporting mechanism for thermogravimetric analyzer and thermogravimetric analyzer

Abstract

The utility model relates to the technical field of thermogravimetric testing, in particular to a sample supporting mechanism for a thermogravimetric analyzer and the thermogravimetric analyzer, the sample supporting mechanism comprises a base, a supporting assembly, a sample container and a counterweight structure, the base is used for being arranged on a weighing table of the thermogravimetric analyzer, and the supporting assembly is arranged on the base. The supporting assembly comprises a first supporting rod, a second supporting rod and a heat insulation part, the first supporting rod and the second supporting rod are coaxially arranged, one end of the first supporting rod is connected with one end of the second supporting rod through the heat insulation part, the second supporting rod is arranged on the base in a penetrating mode, and the sample container is used for containing a sample; the sample container is arranged at the other end, far away from the heat insulation piece, of the first supporting rod, and the counterweight structure is arranged at the other end, far away from the heat insulation piece, of the second supporting rod, so that the detection precision of the thermogravimetric analyzer is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to thermal gravimetric test technical field, especially relate to a sample support mechanism for thermal gravimetric analyzer and thermal gravimetric analyzer. BACKGROUND

[0002] Thermal gravimetric test is an important material characterization means, which is used to evaluate the thermal stability of test materials, and is of great significance in the fields of high polymer materials, energy materials, composite material development, etc. for studying the high temperature volatility, thermal stability and other characteristics of materials. When performing thermal gravimetric test, a thermal gravimetric analyzer is used, which can heat the sample and monitor and record the change of the mass of the sample during the test process through a mass sensor to obtain the thermal gravimetric curve of the sample.

[0003] The current thermal gravimetric analyzer usually uses a sample support to support the sample in the heating device, and through a support arm, the weight of the sample and the sample support can act on the mass sensor outside the heating device. However, this arrangement will affect the detection sensitivity of the mass sensor due to the large weight of the overall support device and the poor heat insulation of the support arm, ultimately resulting in poor detection accuracy of the thermal gravimetric analyzer. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defect that the sample support method of the existing thermal gravimetric analyzer affects the detection accuracy of the sample by the mass sensor, and to provide a sample support mechanism for a thermal gravimetric analyzer and a thermal gravimetric analyzer.

[0005] The utility model solves the above technical problems by the following technical solutions:

[0006] In a first aspect, the utility model provides a sample support mechanism for a thermal gravimetric analyzer, which includes a base, a support assembly, a sample container and a counterweight structure. The base is used to be arranged on a weighing platform of the thermal gravimetric analyzer. The support assembly includes a first support rod, a second support rod and a heat insulation piece. The first support rod and the second support rod are coaxially arranged, and one end of the first support rod and one end of the second support rod are connected by the heat insulation piece. The second support rod is arranged on the base. The sample container is used to place the sample, and is arranged at the other end of the first support rod away from the heat insulation piece. The counterweight structure is arranged at the other end of the second support rod away from the heat insulation piece.

[0007] The sample support mechanism provided by the utility model, through setting base, support assembly, sample container and counterweight structure, wherein support assembly includes coaxially arranged first support rod and second support rod, one end of first support rod and one end of second support rod are connected through heat insulation piece, sample container is arranged at one end of first support rod away from heat insulation piece, second support rod is arranged on base, counterweight structure is arranged at the other end of second support rod away from heat insulation piece, in this way, sample container and counterweight structure can utilize lever type structure formed by support assembly to keep overall structural gravity center at the position of base, which is convenient for arranging base on weighing table of thermogravimetric analyzer to measure the weight of overall structure, so that the sample support mechanism is simplified, therefore the structural weight is reduced to a certain extent, on this basis, first support rod and second support rod are connected through heat insulation piece, so that high temperature acting on sample container in testing process can be as little as possible to be transmitted to second support rod connected with base through the block of heat insulation piece, so that high temperature cannot be transmitted to the position of weighing table to affect the detection accuracy of mass sensor, through the above setting, the detection accuracy of thermogravimetric analyzer is effectively guaranteed.

[0008] Preferably, the sample container comprises a crucible, an installation ring is arranged at the other end of the first support rod, and the installation ring is sleeved on the crucible; the installation ring and the first support rod are detachably connected.

[0009] The sample container uses a crucible, which can conveniently hold a sample in a liquid state after heating, and also facilitates Kundsen diffusion during heating, so as to optimize the design of the crucible and the gap through hole, thereby meeting the high temperature test requirements. The detachable connection between the installation ring and the first support rod facilitates replacement of the installation ring and the sample crucible to adapt to synchronous adjustment and replacement of the crucible under different sample weights.

[0010] Preferably, a connecting portion is arranged at the position of the installation ring facing the first support rod, a first threaded hole is formed in the connecting portion, an external thread is arranged on the outer circumferential surface of the first support rod at the other end of the first support rod, and the other end of the first support rod is inserted into the first threaded hole to be threadedly connected with the connecting portion.

[0011] Preferably, the heat insulation piece is a tubular structure, and one end of the first support rod and one end of the second support rod are respectively sleeved at the two end openings of the heat insulation piece.

[0012] In this way, on the one hand, the support assembly is formed into a rod-shaped structure, which not only facilitates connection of the first support rod and the second support rod, but also facilitates implementation of the lever type structure, and on the other hand, the hollow tubular structure of the heat insulation piece can further improve its heat insulation effect.

[0013] Preferably, the thermal conductivity of the heat insulation member is not higher than 2 W / (m*K). In this way, the heat insulation member can have better heat insulation effect, so as to further ensure that the temperature at the weighing table at the bottom of the base is low, thereby ensuring the accuracy of the test results.

[0014] Preferably, the first support rod and the second support rod are made of carbon-carbon composite material, so as to further realize the lightweight of the structure and reduce the heat conduction of each structural member as much as possible.

[0015] Preferably, the counterweight structure comprises a plurality of counterweight blocks, and all the counterweight blocks are detachably connected with the second support rod.

[0016] In this way, the force at the position of the counterweight structure can be adjusted by changing the weight of the counterweight blocks, so as to ensure that the mass distribution of the whole support assembly can ensure the effect that the center of gravity does not change.

[0017] Preferably, at the other end of the second support rod, an external thread is arranged on the outer circumferential surface of the second support rod, and a second threaded hole is arranged through each counterweight block, the counterweight block can be arranged at the other end of the second support rod and is movable relative to the axial direction of the second support rod.

[0018] In this way, on the one hand, the connection and fixation of the counterweight block and the second support rod are realized, and on the other hand, the position of the counterweight block can be adjusted after the counterweight block is installed on the second support rod, so as to adjust the position of the center of gravity of the sample support mechanism.

[0019] Preferably, the base comprises a fixed table and a buffer pad member, a connecting hole is arranged on the fixed table, the second support rod is arranged in the connecting hole, and the buffer pad member is arranged at the bottom of the fixed table.

[0020] In this way, on the one hand, the stability of the whole sample support mechanism can be ensured, so as to improve the stability of the weighing table during the test process, and rigid contact between the sample support mechanism and the weighing table can be avoided, and the detection accuracy of the mass sensor can be further improved. On the other hand, the buffer pad member can further have a heat insulation effect.

[0021] In a second aspect, the utility model also provides a thermal gravimetric analyzer, which comprises the sample support mechanism as described above, and further comprises a heating device, and the sample container is arranged in a heating cavity of the heating device.

[0022] The thermal gravimetric analyzer provided by the utility model has the same beneficial effects as the sample support mechanism described above, and thus will not be described again.

[0023] Preferably, the thermogravimetric analyzer further comprises an isolation layer arranged between the base and the heating device to further insulate high temperature.

[0024] Preferably, the thermogravimetric analyzer further comprises a cooling device arranged at the outer circumferential side of the heat insulation member to further cool the heat insulation member, thereby improving the heat insulation effect of the heat insulation member.

[0025] On the basis of common knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, thereby obtaining each preferred embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A structure schematic view of a sample support mechanism provided by an embodiment of the present application.

[0027] Figure 2 A partial structure schematic view of a sample container and a support assembly of a sample support mechanism provided by an embodiment of the present application.

[0028] Figure 3 A structure schematic view of a base of a sample support mechanism provided by an embodiment of the present application.

[0029] Figure 4 A cross-sectional schematic view of a partial structure of a thermogravimetric analyzer provided by an embodiment of the present application.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 10. A sample support mechanism;

[0032] 1. A base; 11. A fixed table; 111. A connecting hole; 12. A buffer pad; 2. A support assembly; 21. A first support rod; 22. A second support rod; 23. A heat insulation member; 24. A mounting ring; 25. A connecting part; 251. A first threaded hole; 3. A sample container; 4. A counterweight structure; 41. A counterweight block;

[0033] 20. A heating device; 201. A heating body; 202. A heat preservation layer;

[0034] 30. A constant temperature and humidity cavity;

[0035] 40. An isolation layer;

[0036] 50. A cooling device. DETAILED DESCRIPTION

[0037] The present application will be further described by way of examples, but the present application is not limited to the examples.

[0038] Thermogravimetric test is an important material characterization method, which is used to evaluate the thermal stability of the test material, and is of great significance in the fields of high polymer materials, energy materials, composite material development, etc. for studying the high temperature volatility, thermal stability and other characteristics of the material. When performing thermogravimetric test, a thermogravimetric analyzer is used. The thermogravimetric analyzer can heat the sample, and monitor and record the change of the mass of the sample during the test through the mass sensor, so as to obtain the thermogravimetric curve of the sample.

[0039] The current thermogravimetric analyzer usually uses a sample support to support the sample in the heating device, and the weight of the sample and the sample support can act on the mass sensor outside the heating device through the support arm. However, this arrangement will affect the detection sensitivity of the mass sensor due to the large weight of the overall support device and the poor heat insulation of the support arm, ultimately resulting in poor detection accuracy of the thermogravimetric analyzer.

[0040] In view of the above problems, the sample support mechanism for the thermogravimetric analyzer and the thermogravimetric analyzer are provided. The structure of the sample support mechanism is improved, the structure of the sample support mechanism is further simplified, so that the weight can be reduced as much as possible, and the heat insulation of the support mechanism can be improved to a certain extent, so that the detection accuracy of the thermogravimetric analyzer is effectively ensured.

[0041] The above is the core idea of the embodiments of the present application. In the following, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the embodiments of the present application.

[0042] As shown in Figures 1-4 The sample support mechanism 10 for the thermogravimetric analyzer provided by the embodiments of the present application comprises a base 1 and a support assembly 2. The base 1 is arranged on the weighing table of the thermogravimetric analyzer, and the support assembly 2 comprises a first support rod 21, a second support rod 22 and a heat insulation piece 23. The first support rod 21 and the second support rod 22 are coaxially arranged, and one end of the first support rod 21 and one end of the second support rod 22 are connected by the heat insulation piece 23. The second support rod 22 is arranged on the base 1.

[0043] Specifically, the first support rod 21 and the second support rod 22 are coaxially arranged, that is, the first support rod 21 and the second support rod 22 are arranged in the same direction, and the heat insulation piece 23 can connect the first support rod 21 and the second support rod 22, so that the first support rod 21, the heat insulation piece 23 and the second support rod 22 integrally form a rod-shaped structure. On this basis, the second support rod 22 is arranged on the base 1, so that the support assembly 2 forms a lever structure.

[0044] Further, the sample support mechanism further comprises a sample container 3 and a counterweight structure 4, wherein the sample container 3 is used to place a sample and is arranged at the other end of the first support rod 21 away from the heat insulation piece 23, and the counterweight structure 4 is arranged at the other end of the second support rod 22 away from the heat insulation piece 23.

[0045] Specifically, the sample container 3 and the counterweight structure 4 are arranged at the two ends of the support assembly 2 respectively, and the lever structure formed by the support assembly 2 can make the counterweight structure 4 and the sample container 3 respectively generate an acting force on the support assembly 2 to balance the support assembly 2, so that the center of the whole of the support assembly 2, the sample container 3 and the counterweight structure 4 can be formed at the position where the second support rod 22 is connected to the base 1, so that the weighing platform arranged at the base 1 can accurately measure the weight of the whole structure. For example, the weight of the counterweight structure 4 can be adjusted adaptively according to the change of the sample weight, so that the center of gravity of the whole structure remains unchanged.

[0046] In specific implementation, one end of the first support rod 21 provided with the sample container 3 is located in the heating device 20, for example, a programmable temperature-controlled furnace, and the heat insulation piece 23 and the second support rod 22 are located outside the heating device 20, so that the heating device 20 can heat as few parts of the support assembly 2 as possible, and the high temperature received by the part of the support assembly 2 located inside the heating device 20 is transmitted to the part of the support assembly 2 located outside the heating device 20 as much as possible.

[0047] During the test, the furnace can heat the sample under a specific atmosphere at a preset heating rate, and the mass sensor outside the furnace can continuously and accurately measure the change of the sample mass during the heating process, so as to obtain the thermogravimetric curve of the sample, that is, the mass-temperature change curve of the sample. During the test, the temperature at the position of the sample container 3 can reach a high temperature of 1000℃, and by arranging the heat insulation piece 23, the temperature at the position of the bottom of the base 1 used for docking with the weighing platform can be kept below 40℃, which not only ensures the stability of the structure during the test, but also ensures the accuracy of the test result.

[0048] In summary, the sample support mechanism 10 provided by the embodiments of the present application is provided, through the setting of the base 1, the support assembly 2, the sample container 3 and the counterweight structure 4, wherein the support assembly 2 comprises the coaxially arranged first support rod 21 and the second support rod 22, one end of the first support rod 21 and one end of the second support rod 22 are connected through the heat insulation piece 23, the sample container 3 is arranged at the end of the first support rod 21 away from the heat insulation piece 23, the second support rod 22 is arranged on the base 1, and the counterweight structure 4 is arranged at the other end of the second support rod 22 away from the heat insulation piece 23, so that the sample container 3 and the counterweight structure can utilize the lever structure formed by the support assembly 2 to keep the overall structural gravity at the position of the base 1, so as to facilitate the base 1 to be arranged on the weighing table of the thermogravimetric analyzer to measure the weight of the overall structure, thereby realizing the simplification of the sample support mechanism, and thus the structural weight is reduced to a certain extent, and on this basis, the first support rod 21 and the second support rod 22 are connected through the heat insulation piece 23, so that the high temperature acting on the sample container 3 in the test process can be as little as possible to be transmitted to the second support rod 22 connected with the base 1, so that the high temperature cannot be transmitted to the position of the weighing table to affect the detection accuracy of the mass sensor, and through the above setting, the detection accuracy of the thermogravimetric analyzer is effectively ensured.

[0049] In order to further realize the lightweight of the structure and as far as possible to reduce the heat conduction effect of each structural member, in some embodiments, the material of the first support rod 21 and the second support rod 22 can use carbon-carbon composite material.

[0050] Specifically, the carbon-carbon composite material is an advanced composite material composed of pure carbon elements, which uses carbon fiber (or graphite fiber) as reinforcement and chemical vapor deposition or impregnated carbon as matrix, and has lighter weight and better high temperature resistance.

[0051] In some embodiments, the thermal conductivity of the heat insulation piece 23 is not higher than 2 W / (m·K). By setting in this way, the heat insulation piece 23 can have better heat insulation effect, so as to further ensure that the temperature at the weighing table at the bottom of the base 1 is low, so as to ensure the accuracy of the test result.

[0052] For example, the material of the heat insulation piece 23 in the embodiment can use boron nitride, such as amorphous boron nitride material. Boron nitride is a crystal composed of nitrogen atoms and boron atoms through covalent bond, which has good high temperature resistance and high thermal stability, and very low thermal conductivity, which can effectively insulate heat.

[0053] Of course, in other embodiments, the first support rod 21, the second support rod 22 and the heat insulation piece 23 can also use other materials, as long as they have sufficient structural high temperature resistance and heat insulation performance.

[0054] As shown in Figure 4 In some embodiments, since the first support rod 21 and the second support rod 22 are both rod structures, the heat insulation piece 23 can be provided as a tubular structure, and one end of the first support rod 21 and one end of the second support rod 22 are respectively sleeved at the two end openings of the heat insulation piece 23.

[0055] In this way, on the one hand, the support assembly 2 as a whole can be formed as a rod-shaped structure, which not only facilitates the connection of the first support rod 21 and the second support rod 22, but also facilitates the realization of the lever structure, and on the other hand, the hollow tubular structure of the heat insulation piece 23 can further improve its heat insulation effect.

[0056] On this basis, the inner side of the two end openings of the heat insulation piece 23 can be provided with internal threads, and correspondingly, the position of one end of the first support rod 21 and the second support rod 22 is provided with external threads, so that the first support rod 21 and the second support rod 22 are connected with the heat insulation piece 23 through threaded connection to ensure the connection effect. For details, please refer to Figure 4 .

[0057] As shown in Figure 1 In some embodiments, the sample container 3 includes a crucible, and the other end of the first support rod 21 is provided with a mounting ring 24, which is used to be sleeved on the crucible.

[0058] The sample container 3 uses a crucible, which can facilitate the holding of samples in liquid state after heating, and also facilitate the Kundsen diffusion requirement of the sample during heating, so as to optimize the design of the crucible and the gap transparent hole, thereby meeting the high temperature test requirement. In specific implementation, the material of the crucible can be selected as special graphite to realize better heat conduction performance and better structural stability in high temperature environment.

[0059] On this basis, the mounting ring 24 and the first support rod 21 are detachably connected. In this way, the mounting ring 24 and the sample crucible can be replaced to adapt to the synchronous adjustment and replacement of the crucible under different sample weights.

[0060] For example, the detachable connection between the mounting ring 24 and the first support rod 21 can adopt threaded connection. For details, please refer to Figure 2 . The position of the mounting ring 24 facing the first support rod 21 is provided with a connecting part 25, and the connecting part 25 is provided with a first threaded hole 251. Correspondingly, the other end of the first support rod 21 is provided with an external thread on the outer peripheral surface of the first support rod 21, and the other end of the first support rod 21 is inserted into the connecting hole and connected with the connecting hole through threaded connection, so as to realize the detachable connection of the mounting ring 24 and the first support rod 21.

[0061] As mentioned above, after the sample is replaced, in order to ensure that the gravity center of the sample support mechanism 10 as a whole remains unchanged at the position of the base 1, it is necessary to adjust the weight of the counterweight structure 4, and therefore, in some embodiments, the counterweight structure 4 can include a plurality of counterweight blocks 41, all of which are detachably connected with the second support rod 22. In this way, the force at the position of the counterweight structure 4 can be adjusted by changing the weight of the counterweight blocks 41, so as to ensure that the mass distribution of the support assembly 2 as a whole can ensure the effect of keeping the gravity center unchanged.

[0062] As shown in Figure 4 In an implementable manner, an external thread can be arranged on the outer circumferential surface of the second support rod 22 at the other end of the second support rod 22, and a second threaded hole is arranged through the counterweight block 41, and the counterweight block 41 can be arranged at the other end of the second support rod 22 and movable relative to the axial direction of the second support rod 22. In this way, on the one hand, the connection and fixation of the counterweight block 41 and the second support rod 22 are realized, and on the other hand, the position of the counterweight block 41 can be adjusted after the counterweight block 41 is installed on the second support rod 22, so as to adjust the position of the gravity center of the sample support mechanism 10.

[0063] As shown in Figure 3 In some embodiments, the base 1 can further include a fixed table 11 and a buffer pad 12, wherein the fixed table 11 is provided with a connecting hole 111 in which the second support rod 22 is arranged, and the buffer pad 12 is arranged at the bottom of the fixed table 11.

[0064] The arrangement of the buffer pad 12 can ensure the structural stability of the sample support mechanism 10 as a whole, so as to improve the stability of the weighing table during the test process, avoid the rigid contact between the sample support mechanism 10 and the weighing table, and further improve the detection accuracy of the mass sensor. On the other hand, the arrangement of the buffer pad 12 can also have a further heat insulation effect.

[0065] In specific implementation, the buffer pad 12 can be made of PEEK material, i.e., polyether ether ketone special engineering plastic, which has good high-temperature resistance and wear resistance.

[0066] As shown in Figure 4 For the sample support mechanism 10 described above, the utility model embodiment further provides a thermogravimetric analyzer, which includes the sample support mechanism 10 described above. Further, the thermogravimetric analyzer further includes a heating device 20, and the sample container 3 of the sample support mechanism 10 is located in the heating cavity of the heating device 20.

[0067] The heating device 20 is used for heating and keeping the sample during the test, and therefore, in an implementable manner, the heating device 20 comprises a heating body 201 and a heat preservation layer 202 for covering the outer periphery of the sample, so as to ensure that the sample is continuously in a high-temperature environment after being heated on the basis of realizing the heating of the sample.

[0068] In a specific implementation, the thermogravimetric analyzer further comprises a constant temperature and humidity cavity 30, and the base 1 and the counterweight structure 4 are located in the constant temperature and humidity cavity 30. That is, the sample container 3 and a part of the first support rod 21 are located in the heating device 20, and the base 1 and a part of the second support rod 22 are located in the constant temperature and humidity cavity 30. In this way, it can be further ensured that the high temperature after heating is not transmitted to the position of the weighing table, so as to ensure the accuracy of the weighing structure.

[0069] As shown in Figure 2 Further, the thermogravimetric analyzer further comprises an isolation layer 40, which is arranged between the heating device 20 and the constant temperature and humidity cavity 30, so as to further insulate the high temperature.

[0070] In addition, the thermogravimetric analyzer can further comprise a cooling device 50, which is located on the outer periphery side of the heat insulation member 23. The cooling device 50 can further cool the heat insulation member 23, so as to improve the heat insulation effect of the heat insulation member 23. For example, in the embodiment, the cooling device 50 can be implemented by using water cooling, and in other embodiments, other cooling methods can also be used, such as air cooling or using phase change material cooling.

[0071] The sample support mechanism 10 described above can be subjected to a temperature test before use, so as to further ensure that the mechanism before use is within the required range.

[0072] Specifically, the steps of the temperature test are as follows:

[0073] First, the sample container 3 is weighed, and then the weight of the counterweight structure 4 matched with the sample and the sample container 3 is obtained, and the number of counterweight blocks 41 is adjusted, so that the overall structural gravity center of the sample support mechanism 10 is located at the position of the base 1. Then, the heating device 20 is vacuumized, and the chamber is heated to a set temperature and kept for a certain time, and then the temperature change of the bottom of the base 1 is monitored, and then the corresponding relationship between the temperature change of the bottom of the base 1 and the temperature change of the position of the sample container 3 is further detected and analyzed, to see whether it meets the requirements.

[0074] It should be noted that how to determine that the overall structural gravity center of the sample support mechanism 10 is located at the position of the base 1 can be that the sample support mechanism 10 is placed on a horizontal plane, and then it is observed whether the first support rod 21 and the second support rod 22 are in a horizontal state. In the horizontal state, the gravity center of the sample support mechanism 10 is located at the position of the base 1.

[0075] After the temperature test, the sample support mechanism 10 as a whole meets the set requirements, and the chassis obtains the thermal gravimetric curve of the sample.

[0076] Specifically, the test process of the sample includes the following steps:

[0077] The sample is placed in the sample container 3 and is compacted and pre-melted, and then the sample crucible and the sample are initially weighed by a high-precision balance; the number of counterweights 41 matched with the sample is obtained through torque and weight calculation, the counterweights 41 are installed and adjusted in position, so that the center of gravity of the sample support mechanism 10 as a whole is on the base 1. The heating device 20 is filled with inert gas, and then heated and vacuumized in an inert atmosphere, for example, heated to 800 DEG C, kept for 2 hours, and kept at a vacuum degree below 10-4 pa. In this process, the high-precision mass sensor at the bottom of the base 1 is opened to monitor the sample thermal gravimetric curve. Finally, the sample container 3 and the sample are taken out, and are re-weighed by a high-precision balance, and the weighing data before and after the experiment and the thermal gravimetric data are comprehensively evaluated.

[0078] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A sample support mechanism for a thermal gravimetric analyzer, characterized by, The application relates to a sample support mechanism for a thermal gravimetric analyzer. The sample support mechanism comprises a base, a support assembly, a sample container and a counterweight structure. The base is arranged on a weighing platform of the thermal gravimetric analyzer. The support assembly comprises a first support rod, a second support rod and a heat insulation member. The first support rod and the second support rod are coaxially arranged.

2. The sample support mechanism of claim 1, wherein, One end of the first support rod and one end of the second support rod are connected by the heat insulation member. The second support rod is arranged on the base.

3. The sample support mechanism of claim 2, wherein, The sample container is arranged at the other end of the first support rod away from the heat insulation member. The counterweight structure is arranged at the other end of the second support rod away from the heat insulation member.

4. The sample support mechanism of claim 1, wherein, The sample container comprises a crucible.

5. A sample support mechanism according to any one of claims 1 to 4, wherein, An installation ring is arranged at the other end of the first support rod. The installation ring is detachably connected with the first support rod.

6. A sample support mechanism according to any one of claims 1 to 4, wherein, A connecting portion is arranged at the position of the installation ring facing the first support rod.

7. The sample support mechanism of claim 6, wherein, A first threaded hole is arranged on the connecting portion.

8. A sample support mechanism according to any one of claims 1 to 4, wherein, An outer thread is arranged on the outer circumferential surface of the first support rod at the other end of the first support rod.

9. A thermogravimetric analyzer characterized by, The other end of the first support rod is inserted into the first threaded hole to be threadedly connected with the connecting portion. The heat insulation member is a tubular structure.

10. The thermogravimetric analyzer of claim 9, wherein, One end of the first support rod and one end of the second support rod are respectively sleeved on the two end openings of the heat insulation member. The thermal conductivity of the heat insulation member is not higher than 2 W / (m.K). The first support rod and the second support rod are made of carbon-carbon composite material. The counterweight structure comprises a plurality of counterweight blocks. All the counterweight blocks are detachably connected with the second support rod. An outer thread is arranged on the outer circumferential surface of the second support rod at the other end of the second support rod. A second threaded hole is arranged on each of the counterweight blocks. The counterweight blocks can be sleeved on the other end of the second support rod and can be moved relative to the axial direction of the second support rod. The base comprises a fixed table and a buffer pad. A connecting hole is arranged on the fixed table. The second support rod is sleeved on the connecting hole. The buffer pad is arranged on the bottom of the fixed table. The thermal gravimetric analyzer further comprises a heating device. The sample container is arranged in the heating cavity of the heating device. The thermal gravimetric analyzer further comprises an isolation layer arranged between the base and the heating device. The thermal gravimetric analyzer further comprises a cooling device arranged on the outer circumferential side of the heat insulation member.

Images