Sample container accurate positioning device suitable for heat insulation calorimeter

Abstract

The utility model belongs to the technical field of thermal test instruments, and discloses a sample container accurate positioning device suitable for an adiabatic calorimeter, which comprises a sample container fixing and limiting cavity, a support bottom plate and an adjusting bolt, and the sample container fixing and limiting cavity is a hollow shell; a threaded hole is formed in the bottom of the sample container fixing and limiting cavity, and scales are arranged on the side wall; the lower end of the adjusting bolt is screwed in a bottom threaded hole of the sample container fixing and limiting cavity, and the upper end is used for placing the supporting bottom plate; the supporting bottom plate is flatly inserted into the inner cavity of the sample container fixing and limiting cavity, and the bottom surface of the supporting bottom plate is contacted with the upper end of the adjusting bolt. According to the technical scheme of the utility model, the heat insulation performance test of various different materials can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal test instruments, and in particular relates to a sample container precise positioning device suitable for an adiabatic calorimeter. Background Art

[0002] Thermal safety is a key component of safety and reliability research for energetic materials. Traditional thermal analysis methods, such as TG, DTA, and DSC, are currently widely used both domestically and internationally to evaluate the thermal safety of hazardous chemicals. These methods, characterized by their ability to obtain crucial information on hazards using minimal sample volume and simple methods, are both economical and safe, making them crucial for evaluating the thermal safety of new and inexperienced hazardous substances, particularly those suspected of being explosive.

[0003] However, these traditional thermal analysis methods are typically conducted under non-adiabatic conditions and use very small sample sizes, significantly different from the environmental conditions encountered during actual production and use. This can easily underestimate the actual hazard of hazardous substances, posing a safety hazard in both production and use. The hazard of initiating explosives, the most sensitive component of pyrotechnic agents, is even more significant. Furthermore, with the advancement of pyrotechnic technology, a variety of new pyrotechnic agents have emerged. Accumulating chemical reaction kinetic parameters under adiabatic conditions for these new agents provides fundamental safety data for their application in future pyrotechnic systems.

[0004] Therefore, to meet the needs of future safety assessments for new explosives and to overcome the shortcomings of traditional thermal analysis methods, safety assessment methods have gradually emerged that combine traditional thermal analysis with adiabatic acceleration calorimetry. This method increases sample size to the gram level, a thousand-fold increase compared to methods such as DSC, achieves adiabatic control, improves thermal detection sensitivity and accuracy, and utilizes computers for automated control, recording, and analysis of data.

[0005] These advances have brought these laboratory evaluation methods closer to actual production and use, resulting in more accurate and practical evaluation results. The introduction and use of ARC will strengthen the accumulation of thermal hazard data for explosives, providing support for the rational selection of explosives.

[0006] The Adiabatic Calorimeter (ARC) is the world's most advanced instrument, capable of providing adiabatic calorimetric data in a safe and controlled experimental environment. It uses adiabatic kinetic analysis to generate data and a wide range of thermodynamic factors, such as activation energy, reaction order, frequency factor, adiabatic temperature rise, and heat of reaction. This data can be used to scale up and measure thermal hazards under real-world conditions. Chemical runaway reactions are the most common, and understanding these reactions can help prevent these hazards.

[0007] To ensure accurate testing during adiabatic calorimetry, the top of the thermocouple must be in full contact with the bottom of the sample chamber. Second, after the sample chamber is filled with the test material, it must be first raised to the top heater layer during assembly and then lowered a certain distance to prevent an overly tight fit that could cause the instrument's test interface to become stuck and damaged. However, the lowering distance of the sample chamber is currently controlled solely by vision and feel, which often results in a loose seal in the sample chamber. This can cause sudden pressure drops and inaccurate calorific values during adiabatic calorimetry testing, posing a significant safety hazard to operators, particularly during energetic material testing. Utility Model Content

[0008] (1) Technical issues to be resolved

[0009] The technical problem to be solved by the present invention is that the descending distance of the sample chamber currently relies solely on visual and sensory control, which results in the sample chamber often being loosely sealed, thereby causing problems such as a sudden drop in pressure and inaccurate caloric testing during the adiabatic caloric test process.

[0010] (2) Technical solution

[0011] In order to solve the above technical problems, the utility model provides a sample container precise positioning device suitable for an adiabatic calorimeter, comprising a sample container fixed limiting cavity, a supporting base plate and an adjusting bolt, wherein the sample container fixed limiting cavity is a shell with a hollow interior; a threaded hole is provided at the bottom of the sample container fixed limiting cavity, and a scale is provided on the side wall; the lower end of the adjusting bolt is screwed into the threaded hole at the bottom of the sample container fixed limiting cavity, and the upper end is used to place the supporting base plate; the supporting base plate is inserted flatly into the inner cavity of the sample container fixed limiting cavity, and its bottom surface contacts the upper end of the adjusting bolt.

[0012] Furthermore, an opening is provided on one side wall of the fixed limiting cavity of the sample container.

[0013] Furthermore, the sample container fixing limiting cavity is made of transparent material.

[0014] When in use, the sample container of the adiabatic calorimeter is placed on the supporting bottom plate.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The precise positioning device for sample containers of the adiabatic calorimeter can realize the precise positioning and installation of sample containers of different materials and specifications such as titanium base and alloy base, and can meet the adiabatic calorimetry performance test of various materials.

[0018] 2. The precise support base and adjustment bolts designed in the precise positioning device of the sample container for the adiabatic calorimeter can effectively solve the problem of precise sealing during the adiabatic calorimetry test and ensure the consistency of the adiabatic calorimetry performance of various materials in the same batch.

[0019] 3. When the sample container precise positioning device for the adiabatic calorimeter is used for thermal testing of energetic materials, it can effectively solve the safety hazards to operators caused by high-voltage leakage problems and meet the safety testing requirements of energetic materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a sample container precise positioning device suitable for an adiabatic calorimeter according to the present invention;

[0021] Among them: 1. Container fixed limit cavity; 2. Precision support base plate; 3. Adjustment bolt. DETAILED DESCRIPTION

[0022] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

[0023] The sample container precise positioning device of the present embodiment, which is applicable to the adiabatic calorimeter, comprises a sample container fixed limiting cavity 1, a precise supporting base plate 2, and an adjusting bolt 3. Figure 1 The operating process is as follows: First, insert the precision-adjustable base plate flatly into the sample container's fixed stopper. Four adjusting bolts are then threaded into the sample container's fixed stopper, ensuring close contact with the precision-adjustable base plate and providing support. The adiabatic calorimeter sample container, filled with the test sample, is then placed into the container's fixed stopper. The assembled device is then moved into the adiabatic calorimeter, ensuring close contact between the top of the sample container and the top heater being tested. The height of the adjusting bolts is then adjusted to ensure close contact between the precision-adjustable base plate and the bottom of the sample container. The position of the precision-adjustable base plate's upper surface is recorded using the scale on the sidewall of the sample container's fixed stopper. The height of the adjusting bolts is then adjusted downward to control the position of the precision-adjustable base plate's upper surface, w2, until the difference between w2 and w1 is 2 mm. The nut at the sample container's end is adjusted with a wrench to ensure a tight fit within the adiabatic calorimeter. The adiabatic calorimeter's sample container positioning device is then removed, and the adiabatic calorimeter program control software can be opened to begin the test.

[0024] This embodiment uses the adiabatic calorimetry test of the energetic material Octogen as an example for illustration.

[0025] First, insert the precision adjustment base plate flatly into the fixed limit cavity of the sample container, and then fix the four adjusting bolts in the fixed limit cavity of the sample container through the internal thread so that it is in close contact with the precision adjustment base plate to play a supporting role; then take a titanium FT-4-BC sample container, weigh 50 mg of Octogen powder sample, and put it into the sample container cavity; place the sample container cavity containing Octogen in the container fixed limit cavity; move the assembled entire device into the adiabatic calorimeter so that the top of the sample container cavity is in close contact with the top heater tested by the adiabatic calorimeter; then adjust the height of the adjusting bolt so that the precision support base plate is tightly combined with the bottom end of the sample container cavity, and record the upper surface position scale of the precision adjustment base plate at 55mm through the scale on the side wall of the sample container fixed limit cavity; then adjust the height of the adjusting bolt downward to control the upper surface position of the precision adjustment base plate to stop adjusting when it reaches 53mm. Use a special wrench to adjust the nut at the port of the sample container cavity so that it is tightly combined with the adiabatic calorimeter. At this time, remove the sample container precise positioning device of the adiabatic calorimeter, open the adiabatic calorimeter program control software and start the test.

[0026] After testing, the adiabatic thermal exothermic fronts of three batches of Octogen samples of the same quality were 282℃, 280℃, and 280℃, and the corresponding pressures were 6.2Bar, 6.1Bar, and 6.2Bar, that is, the consistency of the adiabatic thermal performance of samples in the same batch was ≮5%, indicating that the test results of the adiabatic thermal performance of the samples were good.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A precise positioning device for a sample container suitable for an adiabatic calorimeter, characterized in that: It includes a sample container fixing and limiting cavity, a supporting base plate and an adjusting bolt. The sample container fixing and limiting cavity is a shell with a hollow interior. A threaded hole is provided at the bottom of the sample container fixing and limiting cavity, and a scale is provided on the side wall. The lower end of the adjusting bolt is screwed into the threaded hole at the bottom of the sample container fixing and limiting cavity, and the upper end is used to place the supporting base plate. The supporting base plate is inserted flatly into the inner cavity of the sample container fixing and limiting cavity, and its bottom surface contacts the upper end of the adjusting bolt.

2. The sample container precise positioning device for an adiabatic calorimeter according to claim 1, characterized in that: An opening is provided on one side wall of the fixed limiting cavity of the sample container.

3. The device for accurately positioning a sample container for an adiabatic calorimeter according to claim 1, wherein: The sample container fixed limiting cavity is made of transparent material.

4. The device for accurately positioning a sample container for an adiabatic calorimeter according to claim 1, wherein: When in use, the sample container of the adiabatic calorimeter is placed on the supporting base.

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