Thermal conductivity testing device with specified bulk density

Abstract

The utility model provides a heat conductivity testing device with specified bulk density, which comprises a lower sample bin, a lower sample bin, a lower sample bin, a lower sample bin, a lower sample bin, a lower sample bin, a lower sample bin, a lower sample bin, an upper sample bin and a lower sample bin, and the lower sample bin comprises a lower cylinder and a lower cover, the lower cylinder and the lower cover enclose to form a lower accommodating cavity; the upper sample bin and the lower sample bin are oppositely arranged, and the upper sample bin is detachably connected to the lower sample bin; the upper sample bin comprises an upper cylinder body and an upper cover, and the upper cover is detachably connected to the upper cylinder body; the upper cylinder body and the lower cylinder body are both made of transparent materials, and indicating scale marks are arranged on the upper cylinder body and the lower cylinder body. The compression mechanism is arranged in the upper sample bin and the lower sample bin; the testing assembly is arranged between the lower sample bin and the upper sample bin; the thermal conductivity testing device solves the technical problem that the testing result is inaccurate due to the fact that the stacking density cannot be unified in the existing thermal conductivity testing device.

Description

Technical Field

[0001] This utility model relates to the field of thermal conductivity testing technology, and more specifically to a thermal conductivity testing device with a specified bulk density. Background Technology

[0002] In materials research and application scenarios, methods for testing the thermal conductivity of powder or filamentous samples using thermal constant analyzers and thermal conductivity meters have serious drawbacks. During testing, samples must be stacked in stages above and below the testing probe, resulting in a chaotic and uncontrollable packing density. Since the thermal conductivity of a sample is closely related to its packing density, for samples with low thermal conductivity, varying degrees of packing looseness lead to significant fluctuations in test results, making it impossible to obtain accurate thermal conductivity values ​​for the sample itself. Furthermore, this testing method has extremely poor repeatability; results from multiple tests are inconsistent and widely differing. Simultaneously, the entire sample stacking process relies on manual operation, and since each person's technique is different, it's difficult to standardize the operation, leading to substantial human error. These problems significantly hinder the accuracy and reliability of materials thermal conductivity testing, slowing down materials research and the pace of technological innovation in industry. Therefore, a novel testing solution is urgently needed to address these challenges. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the prior art and provide a thermal conductivity testing device with a specified bulk density. The purpose is to solve the technical problem that the test results of the existing thermal conductivity testing devices are inaccurate because the bulk density cannot be uniform.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A thermal conductivity testing apparatus with a specified bulk density includes:

[0006] The lower sample chamber includes a lower cylinder and a lower cover, the lower cylinder and the lower cover forming a lower receiving cavity;

[0007] An upper sample chamber is provided, which is disposed opposite to the lower sample chamber and is detachably connected to the lower sample chamber. The upper sample chamber includes an upper cylinder and an upper cover, which is detachably connected to the upper cylinder. The upper cylinder and the upper cover together form an upper receiving cavity, which is connected to the lower receiving cavity. Both the upper cylinder and the lower cylinder are made of transparent material, and both the upper cylinder and the lower cylinder are provided with indicator scale lines.

[0008] A compression mechanism is provided in the upper sample chamber and the lower sample chamber;

[0009] A testing component is disposed between the lower sample chamber and the upper sample chamber;

[0010] The base, the test components, and the lower sample chamber are all fixedly connected to the base.

[0011] In one embodiment, the compression mechanism includes an upper compression component and a lower compression component, which are arranged opposite each other. The upper compression component is located in the upper sample chamber, and the lower compression component is located in the lower sample chamber.

[0012] In one embodiment, the upper compression assembly includes an upper pressure plate and an upper pressure rod. The upper pressure plate is disposed inside the upper cylinder. One end of the upper pressure rod is connected to the upper pressure plate, and the other end of the upper pressure rod passes through and is slidably connected to the upper cover. The upper pressure rod drives the upper pressure plate to be slidably connected to the inner wall of the upper cylinder.

[0013] In one embodiment, the lower compression assembly includes a lower pressure plate and a lower pressure rod. The lower pressure plate is disposed in the lower cylinder body. One end of the lower pressure rod is connected to the lower pressure plate, and the other end of the lower pressure rod passes through and is slidably connected to the lower cover. The lower pressure rod drives the lower pressure plate to be slidably connected to the inner wall of the lower cylinder body.

[0014] In one embodiment, both the upper pressure rod and the lower pressure rod are threaded rods, the upper cover is provided with an upper threaded hole adapted to connect with the upper pressure rod, and the lower cover is provided with a lower threaded hole adapted to connect with the lower pressure rod.

[0015] In one embodiment, the testing assembly includes a fixture, a horizontal plate, and a test probe. The bottom of the fixture is fixedly connected to the base via a connecting rod. The horizontal plate is detachably connected to the fixture. One end of the test probe is connected to the horizontal plate, and the other end passes through the connection between the upper sample chamber and the lower sample chamber and enters the upper receiving cavity and the lower receiving cavity.

[0016] In one embodiment, the fixture includes a fixed plate and an adjusting plate. The fixed plate is fixedly connected to the base via the connecting rod, and the adjusting plate is detachably connected to the fixed plate. The horizontal plate is disposed between the fixed plate and the adjusting plate.

[0017] In one embodiment, the upper cylinder has an upper connecting arm extending outward from one end near the lower cylinder, and the lower cylinder has a lower connecting arm extending outward from one end near the upper cylinder. The upper connecting arm is detachably connected to the lower connecting arm so that the upper receiving cavity is connected to the lower receiving cavity.

[0018] In one embodiment, the upper connecting arm is bolted to the lower connecting arm.

[0019] In one embodiment, the lower connecting arm is fixedly connected to the base via a connecting post, and the lower connecting arm is bolted to the connecting post.

[0020] The advantages of this utility model compared with the prior art are as follows: (1) The tobacco is quantitatively placed in the lower sample chamber, and the compression mechanism pushes it to be flush with the feed port and test component of the lower cylinder. Then, an equal amount of sample is added to the upper sample chamber. The compression mechanism on both sides applies pressure in opposite directions. The compression amount can be precisely adjusted according to the scale line indicated on the chamber wall to ensure that the compression amount of the samples at both ends is consistent, thereby accurately controlling the packing density and providing a stable premise for testing the thermal conductivity of tobacco under different packing densities. (2) The upper and lower cylinders made of transparent material allow the operator to observe the filling of the sample in the chamber in real time and promptly detect problems such as uneven filling. At the same time, the sample status can be monitored at any time during the compression process to ensure the smooth progress of the test. (3) The test component is located between the upper and lower sample chambers. Combined with the compression mechanism with adjustable packing density, it can accurately measure the thermal conductivity of materials under different packing densities, effectively reducing the error caused by uncontrollable packing state and providing accurate and reliable data for the study of material thermal conductivity.

[0021] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0022] Figure 1 A three-dimensional schematic diagram of a thermal conductivity testing device with a specified bulk density provided by this utility model;

[0023] Figure 2 An exploded schematic diagram of a thermal conductivity testing device with a specified bulk density provided by this utility model;

[0024] Figure 3 A plan view of a thermal conductivity testing device with a specified bulk density provided by this utility model;

[0025] Figure 4 for Figure 3 A cross-sectional view along the AA direction.

[0026] Figure Labels

[0027] 1. Upper sample chamber; 11. Upper cylinder; 111. Upper connecting arm; 12. Upper cover; 13. Upper receiving cavity; 112. Indicating scale line; 2. Lower sample chamber; 21. Lower cylinder; 211. Lower connecting arm; 22. Lower cover; 23. Lower receiving cavity; 3. Compression mechanism; 31. Upper compression assembly; 311. Upper pressure plate; 312. Upper pressure rod; 32. Lower compression assembly; 321. Lower pressure plate; 322. Lower pressure rod; 4. Test assembly; 41. Fixer; 411. Fixing plate; 412. Adjusting plate; 42. Horizontal plate; 43. Test probe; 5. Base; 51. Connecting rod. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] See Figures 1 to 4 As shown, this utility model embodiment discloses a thermal conductivity testing device with a specified bulk density, comprising:

[0034] The lower sample chamber 2 includes a lower cylinder 21 and a lower cover 22, which together form a lower receiving cavity 23.

[0035] An upper sample chamber 1 is disposed opposite to a lower sample chamber 2, and the upper sample chamber 1 is detachably connected to the lower sample chamber 2. The upper sample chamber 1 includes an upper cylinder 11 and an upper cover 12, the upper cover 12 being detachably connected to the upper cylinder 11. The upper cylinder 11 and the upper cover 12 enclose an upper receiving cavity 13, which is connected to the lower receiving cavity 23. Both the upper cylinder 11 and the lower cylinder 21 are made of transparent material, and both the upper cylinder 11 and the lower cylinder 21 are provided with indicator scale lines 112.

[0036] Compression mechanism 3 is disposed in the upper sample chamber 1 and the lower sample chamber 2;

[0037] Test component 4, wherein the test component 4 is disposed between the lower sample chamber 2 and the upper sample chamber 1;

[0038] The base 5, the test component 4 and the lower sample chamber 2 are all fixedly connected to the base 5.

[0039] Specifically, the lower sample chamber 2 consists of a lower cylinder 21 and a lower cover 22, forming a lower receiving cavity 23, which is where the initial sample is loaded. The upper sample chamber 1 consists of an upper cylinder 11 and an upper cover 12, forming an upper receiving cavity 13. The upper receiving cavity 13 is connected to the lower receiving cavity 23, facilitating the vertical flow of the sample. The upper sample chamber 1 and the lower sample chamber 2 have the same structure and are positioned opposite each other. The upper sample chamber 1 is detachably connected to the lower sample chamber 2 for easy installation and replacement. The upper cylinder 11 and the lower cylinder 21 are made of transparent material, making it easy to observe the sample loading and compression. The indicator scale 112 on the upper cylinder 11 and the lower cylinder 21 is key to accurately controlling the compression amount. The indicator scale 112 on the upper cylinder 11 and the lower cylinder 21 are set with a unified scale standard to ensure the accuracy of sample compression.

[0040] Compression mechanism 3 is distributed within upper sample chamber 1 and lower sample chamber 2, changing the bulk density of the sample by pushing it. Test component 4, sandwiched between upper and lower sample chambers 2, is the core component for measuring thermal conductivity. Base 5 secures test component 4 and lower sample chamber 2, ensuring device stability and reducing external interference.

[0041] Further, during operation, first place a quantitative sample into the lower cylinder 21, and use the compression mechanism 3 to push it until it is flush with the inlet of the lower cylinder 21. At this time, the top of the sample is in contact with the test component 4. Next, install the upper sample chamber 1, open the upper cover 12, add an equal amount of sample, and then close the cover. Then, use the compression mechanisms 3 on both the upper and lower sides to squeeze the sample in opposite directions. By compressing the equal amounts of sample on both the upper and lower sides to the same standard indicator scale line 112, the compression amount is ensured to be consistent, and the sample density at both ends is uniform.

[0042] In other words, in this embodiment, the sample density is precisely adjusted using the indicator scale 112 and the compression mechanism 3 to meet different testing requirements; ensuring uniform sample density, with simultaneous compression on both sides and consistent compression amounts, avoiding localized over-density or under-density of the sample; the transparent cylinder facilitates observation and enables visual operation; the indicator scale 112 standardizes the compression, improving operational accuracy and efficiency, effectively reducing errors, and obtaining reliable sample thermal conductivity data. It is understood that the thermal conductivity testing device with a specified bulk density in this embodiment is suitable for various powdered or filamentous samples, such as tobacco powder and tobacco shreds.

[0043] It is understood that, in this embodiment, the upper cover 12 and the upper cylinder 11 can be designed as detachable connections such as threaded connection, snap-fit ​​connection or flange connection, depending on the convenience of operation. This embodiment does not specifically limit the connection method and connection structure of the upper cover 12 and the upper cylinder 11.

[0044] In one embodiment, the compression mechanism 3 includes an upper compression component 31 and a lower compression component 32, which are arranged vertically opposite to each other. The upper compression component 31 is disposed in the upper sample chamber 1, and the lower compression component 32 is disposed in the lower sample chamber 2.

[0045] Specifically, the upper compression component 31 is placed in the upper sample chamber 1, and the lower compression component 32 is located in the lower sample chamber 2, with them arranged vertically opposite each other. The upper compression component 31 applies pressure from above to the powdered / filamentous sample placed in the upper cylinder 11, while the lower compression component 32 applies pressure from below to the sample in the lower cylinder 21. This method of applying pressure from above and below allows the sample to be more evenly distributed throughout the test space under the extrusion force in both directions. Compared with unidirectional compression, bidirectional compression of the sample results in a more compact and uniform sample packing, effectively preventing localized loose packing or excessive compaction within the chamber, ensuring the consistency of sample density throughout. Simultaneously, by adjusting the movement depth of the upper compression component 31 and the lower compression component 32 within the upper cylinder 11 and lower cylinder 21 (i.e., moving them to the designated indicator scale line 112), the pressure applied to the sample can be controlled, precisely controlling the sample packing density to meet the requirements for sample packing density under different experimental conditions, thus ensuring accurate measurement of the thermal conductivity of samples at different packing densities. In addition, the bidirectional compression design can accelerate the process of the sample reaching the set packing density, thereby improving testing efficiency.

[0046] In one embodiment, the upper compression assembly 31 includes an upper pressure plate 311 and an upper pressure rod 312. The upper pressure plate 311 is disposed inside the upper cylinder 11. One end of the upper pressure rod 312 is connected to the upper pressure plate 311, and the other end of the upper pressure rod 312 passes through and is slidably connected to the upper cover 12. The upper pressure rod 312 drives the upper pressure plate 311 to be slidably connected to the inner wall of the upper cylinder 11.

[0047] Specifically, the upper compression assembly 31 mainly consists of an upper pressure plate 311 and an upper pressure rod 312. The upper pressure plate 311 is placed inside the upper cylinder 11 and is in direct contact with the powdered / filamentous sample inside the cylinder. One end of the upper pressure rod 312 is firmly connected to the upper pressure plate 311, and the other end passes through the upper cover 12 and forms a sliding connection with the upper cover 12.

[0048] When sample compression is required, the upper pressure rod 312 is moved by external force. The upper pressure rod 312 drives the upper pressure plate 311 to slide along the inner wall of the upper cylinder 11. Since the upper pressure plate 311 is in direct contact with the sample, the sliding of the upper pressure plate 311 applies pressure to the sample, thus achieving the sample compression operation. On the one hand, the sliding connection between the upper pressure rod 312 and the upper cover 12 makes the operation of the upper pressure plate 311 more flexible and convenient. The operator can precisely control the downward movement distance and force of the upper pressure plate 311 according to actual needs, thereby precisely controlling the degree of sample compression. On the other hand, the sliding connection between the upper pressure plate 311 and the inner wall of the upper cylinder 11 ensures that the upper pressure plate 311 always moves vertically downward during the compression process, applying pressure to the sample evenly. This avoids problems such as uneven sample tilting or uneven accumulation in the cylinder due to uneven force, ensuring that the sample has a uniform packing density throughout the entire upper sample chamber 1, providing a stable and reliable sample state for accurate measurement of sample thermal conductivity.

[0049] In one embodiment, the lower compression assembly 32 includes a lower pressure plate 321 and a lower pressure rod 322. The lower pressure plate 321 is disposed inside the lower cylinder 21. One end of the lower pressure rod 322 is connected to the lower pressure plate 321, and the other end of the lower pressure rod 322 passes through and is slidably connected to the lower cover 22. The lower pressure rod 322 drives the lower pressure plate 321 to be slidably connected to the inner wall of the lower cylinder 21.

[0050] Specifically, the lower compression assembly 32 mainly consists of a lower pressure plate 321 and a lower pressure rod 322. The lower pressure plate 321 is placed inside the lower cylinder 21 and is in direct contact with the powdered / filamentous sample inside the cylinder. One end of the lower pressure rod 322 is firmly connected to the lower pressure plate 321, and the other end passes through the lower cover 22 and forms a sliding connection with the lower cover 22.

[0051] When sample compression is required, the lower pressure rod 322 is moved by external force. The lower pressure rod 322 drives the lower pressure plate 321 to slide along the inner wall of the lower cylinder 21. Since the lower pressure plate 321 is in direct contact with the sample, the sliding of the lower pressure plate 321 applies pressure to the sample, thus achieving the sample compression operation. On the one hand, the sliding connection between the lower pressure rod 322 and the lower cover 22 makes the operation of the lower pressure plate 321 more flexible and convenient. The operator can precisely control the upward movement distance and force of the lower pressure plate 321 according to actual needs, thereby accurately controlling the degree of sample compression. On the other hand, the sliding connection between the lower pressure plate 321 and the inner wall of the lower cylinder 21 ensures that the lower pressure plate 321 always moves vertically downward during the compression process, applying pressure to the sample evenly. This avoids problems such as uneven sample tilting or uneven accumulation in the cylinder due to uneven force, ensuring that the sample has a uniform packing density throughout the entire lower sample chamber 2, providing a stable and reliable sample state for accurate measurement of sample thermal conductivity.

[0052] In one embodiment, both the upper pressure rod 312 and the lower pressure rod 322 are threaded rods. The upper cover 12 is provided with an upper threaded hole adapted to be connected to the upper pressure rod 312, and the lower cover 22 is provided with a lower threaded hole adapted to be connected to the lower pressure rod 322.

[0053] Specifically, both the upper pressure rod 312 and the lower pressure rod 322 are designed as threaded rods. This means that the upper pressure rod 312 is threaded to the upper pressure plate 311, and the lower pressure rod 322 is threaded to the lower pressure plate 321. The upper cover 12 has an upper threaded hole that matches the upper pressure rod 312, and the lower cover 22 has a lower threaded hole that matches the lower pressure rod 322. When the sample in the upper sample chamber 1 needs to be compressed, rotating the upper pressure rod 312 causes it to move linearly along the threaded path due to the threaded engagement with the upper threaded hole, thereby causing the upper pressure plate 311 to move up and down within it. Similarly, for the lower sample chamber 2, rotating the lower pressure rod 322 causes it to move up and down within it through its engagement with the lower threaded hole. The threaded drive offers excellent precision and controllability. By rotating the upper pressure rod 312 and lower pressure rod 322 a certain number of times, the movement of the upper pressure plate 311 and lower pressure plate 321 to the designated indicator scale line 112 can be precisely controlled, thereby accurately controlling the amount of sample compression. This is crucial for thermal conductivity tests that require precise setting of bulk density, significantly improving the accuracy and reliability of test results. The threaded connection provides stable self-locking performance. After the upper pressure plate 311 and lower pressure plate 321 are adjusted to the appropriate position, the self-locking effect of the thread ensures that the pressure plates remain stable during the test, preventing displacement due to the elastic recovery of the sample or slight external vibrations, ensuring that the sample maintains a constant bulk density throughout the test. Furthermore, rotating the upper pressure rod 312 and lower pressure rod 322 is relatively simple, requiring no complex tools or additional power equipment. Operators can easily compress the sample according to the indicator scale line 112 and test requirements, improving operational convenience and efficiency.

[0054] It is understandable that the shape and size of the upper pressure plate 311 are designed to be adapted to the upper cylinder 11, and the shape and size of the lower pressure plate 321 are designed to be adapted to the lower cylinder 21, so that the upper pressure plate 311 and the inner wall of the upper cylinder 11 and the lower pressure plate 321 and the inner wall of the lower cylinder 21 are seamlessly connected, thereby ensuring that the sample is located between the upper pressure plate 311 and the lower pressure plate 321 when the sample is compressed.

[0055] In one embodiment, the test assembly 4 includes a fixture 41, a horizontal plate 42, and a test probe 43. The bottom of the fixture 41 is fixedly connected to the base 5 via a connecting rod 51. The horizontal plate 42 is detachably connected to the fixture 41. One end of the test probe 43 is connected to the horizontal plate 42, and the other end passes through the connection between the upper sample chamber 1 and the lower sample chamber 2 and enters the upper receiving cavity 13 and the lower receiving cavity 23.

[0056] Specifically, the test assembly 4 mainly consists of a fixture 41, a horizontal plate 42, and a test probe 43. The bottom of the fixture 41 is securely connected to the base 5 via a connecting rod 51, providing a solid support foundation for the entire test assembly 4. This ensures that the test probe 43 will not shake due to external vibrations or other factors during measurement, maintaining a stable contact position between the test probe 43 and the sample, thereby ensuring the reliability and accuracy of the measurement data. The horizontal plate 42 is detachably connected to the fixture 41, increasing the flexibility of the device. It allows for quick replacement of the appropriate horizontal plate 42 for different types and sizes of test probes 43 or different testing scenarios, improving the versatility and adaptability of the device and meeting diverse testing needs. One end of the test probe 43 is connected to the horizontal plate 42 to obtain the necessary conditions such as stable support and electrical connection; the other end passes through the connection between the upper sample chamber 1 and the lower sample chamber 2, extending between the upper receiving cavity 13 and the lower receiving cavity 23, so that the test probe 43 can directly contact the sample in the upper sample chamber 1 and the lower sample chamber 2, quickly sense the heat transfer of the sample, effectively improve the measurement efficiency, and accurately obtain the sample thermal conductivity data. It can be understood that in this embodiment, the test probe 43 is a plate probe to ensure that the sample in the upper cylinder 11 and the lower cylinder 21 overflows.

[0057] In one embodiment, the fixture 41 includes a fixing plate 411 and an adjusting plate 412. The fixing plate 411 is fixedly connected to the base 5 via the connecting rod 51, and the adjusting plate 412 is detachably connected to the fixing plate 411. The horizontal plate 42 is disposed between the fixing plate 411 and the adjusting plate 412.

[0058] Specifically, the fixture 41 consists of a fixed plate 411 and an adjusting plate 412. The fixed plate 411 serves as a basic support and fixation, connected to the base 5 via a connecting rod 51, forming the stable foundation of the entire fixture 41. The adjusting plate 412 is detachably connected to the fixed plate 411, allowing for replacement or adjustment according to actual testing needs. The horizontal plate 42 is positioned between the fixed plate 411 and the adjusting plate 412, providing a stable clamping effect through their mutual cooperation. When it is necessary to adjust the position of the horizontal plate 42 or replace it with a different specification, simply remove the adjusting plate 412 and precisely adjust its vertical and horizontal position by adding or removing shims or adjusting the relative position of the adjusting plate 412 and the fixed plate 411. This ensures that the test probe 43 can be accurately placed in the ideal testing position on the sample, improving testing accuracy and making the operation very convenient. When a part of the horizontal plate 42 or the fixing plate 41 is damaged or needs to be upgraded, the adjusting plate 412 can be disassembled separately to repair or replace the internal horizontal plate 42 or fixing plate 411 without replacing the entire fixing plate 41, saving maintenance time and costs. It is understood that the connecting rod 51 is fixedly connected to the base 5 with bolts.

[0059] In one embodiment, the upper cylinder 11 is provided with an upper connecting arm 111 extending outward from one end near the lower cylinder 21, and the lower cylinder 21 is provided with a lower connecting arm 211 extending outward from one end near the upper cylinder 11. The upper connecting arm 111 is detachably connected to the lower connecting arm 211 so that the upper receiving cavity 13 is connected to the lower receiving cavity 23.

[0060] Specifically, an upper connecting arm 111 extends outward from the end of the upper cylinder 11 near the lower cylinder 21, and similarly, a lower connecting arm 211 extends outward from the end of the lower cylinder 21 near the upper cylinder 11. By detachably connecting the upper connecting arm 111 and the lower connecting arm 211, the upper receiving cavity 13 of the upper sample chamber 1 and the lower receiving cavity 23 of the lower sample chamber 2 can be interconnected. This connection method allows the sample to be continuously distributed between the two cavities, creating conditions for subsequent compression and thermal conductivity tests. Common detachable connection methods include bolt and nut connections and snap-fit ​​connections, facilitating the separation or combination of the upper and lower sample chambers 2 when needed. The detachable connection of the upper connecting arm 111 and the lower connecting arm 211 makes the entire device more convenient to install and disassemble. When testing different samples or cleaning and maintaining the device, the upper and lower sample chambers 2 can be easily separated, making the operation simple, efficient, and saving time and labor costs. Meanwhile, the connection of the outward-extending connecting arms can reliably ensure the connection between the upper receiving cavity 13 and the lower receiving cavity 23, allowing the sample to transition naturally between the two chambers and avoiding uneven sample distribution due to poor connection, which would affect the test results of bulk density and thermal conductivity.

[0061] It is understandable that the upper sample chamber 1 and the lower sample chamber 2 have the same structure and are arranged opposite each other. For different amounts of samples, upper sample chamber 1 and lower sample chamber 2 with appropriate volumes can be selected and connected for use, thereby improving the versatility and adaptability of the device.

[0062] In one embodiment, the upper connecting arm 111 is bolted to the lower connecting arm 211.

[0063] Specifically, the upper connecting arm 111 and the lower connecting arm 211 are connected by bolts. This means that each connecting arm has corresponding bolt holes. During installation, the bolts are passed through the bolt holes of the upper connecting arm 111 and then screwed into the bolt holes of the lower connecting arm 211. By tightening the nuts, the upper connecting arm 111 is securely fixed to the lower connecting arm 211, thus connecting the upper sample chamber 1 and the lower sample chamber 2, allowing smooth communication between the upper receiving cavity 13 and the lower receiving cavity 23. The bolt connection provides strong fastening force. During testing, even if the device is subjected to vibration or external force, the upper connecting arm 111 and the lower connecting arm 211 remain tightly connected and will not easily loosen, ensuring that the upper receiving cavity 13 and the lower receiving cavity 23 remain in a continuous state of communication. This ensures stable sample placement and smooth testing, improving the reliability of the test results. By tightening or loosening the bolts, the relative position between the upper connecting arm 111 and the lower connecting arm 211 can be easily adjusted to accommodate samples of different thicknesses or sizes. Furthermore, when it is necessary to disassemble the upper sample chamber 1 and the lower sample chamber 2, simply unscrewing the bolts allows for easy separation, facilitating cleaning, maintenance, or replacement of different components within the sample chambers, thus improving the maintainability of the device. Simultaneously, bolts, as common standard connectors, are readily available and replaceable. If a bolt is damaged during use, a suitable replacement bolt can be easily found, reducing maintenance costs and difficulty, while also enhancing the versatility of the device.

[0064] In one embodiment, the lower connecting arm 211 is fixedly connected to the base 5 by a connecting post, and the lower connecting arm 211 is bolted to the connecting post.

[0065] Specifically, one end of the connecting column is fixed to the base 5, and the lower connecting arm 211 is connected to the other end of the connecting column by bolts. Threaded holes matching the bolt holes of the lower connecting arm 211 are pre-set on the connecting column. During installation, the bolts are passed through the holes in the lower connecting arm 211 and screwed into the threaded holes of the connecting column. Tightening the bolts securely fixes the lower connecting arm 211 to the connecting column. This design ensures that the lower sample chamber 2 is stably connected to the base 5, laying the foundation for the stability of the entire device. The lower connecting arm 211 is fixed to the base 5 by the connecting column, which increases the stability of the connection between the lower sample chamber 2 and the base 5. Compared to a direct connection, the connecting column better distributes the weight from the lower sample chamber 2 and the internal sample, reducing stress concentration at the connection point between the lower connecting arm 211 and the base 5. This makes the device more stable during testing, effectively preventing displacement of the lower sample chamber 2 due to vibration and other factors, ensuring a stable testing environment, and improving the accuracy of thermal conductivity test data. Furthermore, by suspending the lower sample chamber 2 above the base 5, it provides some operating space for adjusting the lower compression assembly 32, improving ease of use.

[0066] Meanwhile, the bolted connection allows for flexible adjustment of the relative positions of the lower connecting arm 211 and the connecting column to accommodate lower sample chambers 2 of different heights or structures. Furthermore, if the device is subsequently upgraded or modified, and upper sample chambers 1 and lower sample chambers 2 of different specifications are replaced, this connection method can be used for easy installation and fixation, enhancing the adaptability and scalability of the device.

[0067] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A thermal conductivity test apparatus of specified bulk density, characterized by, The utility model relates to a double -layered sample container, which comprises: a lower sample container comprising a lower cylinder and a lower cover, the lower cylinder and the lower cover enclosing a lower accommodating cavity; an upper sample container arranged opposite to the lower sample container, the upper sample container being detachably connected to the lower sample container; the upper sample container comprising an upper cylinder and an upper cover, the upper cover being detachably connected to the upper cylinder, the upper cylinder and the upper cover enclosing an upper accommodating cavity, the upper accommodating cavity being communicated with the lower accommodating cavity; the upper cylinder and the lower cylinder being made of transparent material, the upper cylinder and the lower cylinder being provided with an indicating scale line; a compression mechanism arranged in the upper sample container and the lower sample container; a test assembly arranged between the lower sample container and the upper sample container; a base, the test assembly and the lower sample container being fixedly connected to the base.

2. A thermal conductivity test apparatus of a specified bulk density according to claim 1, wherein, The compression mechanism comprises an upper compression assembly and a lower compression assembly, the upper compression assembly and the lower compression assembly being arranged opposite to each other; the upper compression assembly being arranged in the upper sample container, and the lower compression assembly being arranged in the lower sample container.

3. A thermal conductivity test apparatus of a specified bulk density according to claim 2, wherein, The upper compression assembly comprises an upper pressing plate and an upper pressing rod, the upper pressing plate being arranged in the upper cylinder, one end of the upper pressing rod being connected to the upper pressing plate, the other end of the upper pressing rod being arranged through and slidably connected to the upper cover, the upper pressing rod driving the upper pressing plate to be slidably connected to the inner wall of the upper cylinder.

4. A thermal conductivity test apparatus of a specified bulk density according to claim 3, wherein, The lower compression assembly comprises a lower pressing plate and a lower pressing rod, the lower pressing plate being arranged in the lower cylinder, one end of the lower pressing rod being connected to the lower pressing plate, the other end of the lower pressing rod being arranged through and slidably connected to the lower cover, the lower pressing rod driving the lower pressing plate to be slidably connected to the inner wall of the lower cylinder.

5. A thermal conductivity test apparatus of a specified bulk density according to claim 4, wherein, The upper pressing rod and the lower pressing rod are threaded rods, the upper cover being provided with an upper threaded hole adapted to be connected to the upper pressing rod, and the lower cover being provided with a lower threaded hole adapted to be connected to the lower pressing rod.

6. A thermal conductivity test apparatus of a specified bulk density according to claim 1, wherein, The test assembly comprises a holder, a cross plate and a test probe, the bottom of the holder being fixedly connected to the base through a connecting rod, the cross plate being detachably connected to the holder, one end of the test probe being connected to the cross plate, and the other end of the test probe being arranged through the connection between the upper sample container and the lower sample container and into the upper accommodating cavity and the lower accommodating cavity.

7. A thermal conductivity test apparatus of a specified bulk density according to claim 6, wherein, The holder comprises a fixed plate and an adjusting plate, the fixed plate being fixedly connected to the base through the connecting rod, the adjusting plate being detachably connected to the fixed plate, and the cross plate being arranged between the fixed plate and the adjusting plate.

8. A thermal conductivity test apparatus of a specified bulk density according to claim 1, wherein, One end of the upper cylinder extending outwardly towards the lower cylinder is provided with an upper connecting arm, one end of the lower cylinder extending outwardly towards the upper cylinder is provided with a lower connecting arm, and the upper connecting arm is detachably connected to the lower connecting arm, so that the upper accommodating cavity is communicated with the lower accommodating cavity.

9. A thermal conductivity test apparatus of a specified bulk density according to claim 8, wherein, The upper connecting arm is connected to the lower connecting arm through a bolt.

10. A thermal conductivity test apparatus of a specified bulk density according to claim 9, wherein, The lower connecting arm is fixedly connected to the base through a connecting column, and the lower connecting arm is connected to the connecting column through a bolt.

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