A sample storage container and a coal sample collection, storage and transportation method

Abstract

This application discloses a sample sealing container and a method for collecting, sealing, and transporting coal samples. The sample sealing container includes: a container body with an inner cavity for containing a coal sample; a microporous membrane frame assembly disposed in the top region of the inner cavity, forming a receiving space containing hygroscopic filler; a microporous membrane on the microporous membrane frame assembly, which separates the hygroscopic filler from the gas space within the inner cavity, allowing only water vapor molecules to pass through; a screw cap disposed at the upper opening of the container body for sealing the coal sample within the container body; and an anti-tamper unit disposed on the screw cap and / or the container body, which undergoes an irreversible change when the screw cap is abnormally opened, providing verifiable evidence that the screw cap has been opened. This application also provides a method for collecting, sealing, and transporting coal samples. This application can effectively maintain the original physicochemical properties of the coal sample during the sealing and transport process, prevent human tampering with the sample, and allows for fully automated operation with controllable costs.

Description

Technical Field

[0001] This application belongs to the field of coal quality testing technology, and specifically relates to a sample sealing container and a method for collecting, sealing and transporting coal samples. Background Technology

[0002] The accuracy of coal quality testing results directly affects the economic interests of both trading parties. From conveyor belt sampling to laboratory testing, coal samples undergo transportation and storage. Distortion or tampering with samples at any stage can cause key indicators such as volatile matter, total moisture, calorific value, and sulfur content to deviate from the original coal quality, potentially leading to quality disputes.

[0003] Currently, coal samples collected from conveyor belts are mostly stored in simple, sealed containers made of ordinary plastic or aluminum. These containers lack humidity, oxygen, and electrostatic insulation. External temperature and humidity can seep through the container walls, causing moisture to evaporate or absorb moisture from the coal sample, while oxygen continuously reacts with the volatiles in the coal to induce oxidation. Stray currents and static electricity at the conveyor belt site can easily cause coal dust to adhere to the inner wall of the container, resulting in sample stratification and loss of fine powder. Furthermore, existing sealing methods are limited to plastic seals, lead seals, or tamper-evident adhesive tapes. These seals can be removed and restored by hot air baking, blade peeling, or warm water immersion, lacking irreversible evidence of tampering.

[0004] While improved solutions exist, such as aluminum-plastic composite sealed containers or sampling barrels with RFID active chips, the former lacks electrostatic protection and humidity control, while the latter requires battery power and is bulky, making it difficult to adapt to small conveyor belt automatic sampling machines. Conventional sampling containers also lack internal humidity buffering mechanisms. During long-distance inter-provincial transportation or port storage, the humidity inside the container remains unbalanced; high-moisture coal easily loses water and dries out, while high-volatile bituminous coal easily absorbs moisture and clumps. Therefore, there is an urgent need for a coal sample sealing solution that combines sample authenticity and anti-cheating features, is compatible with conveyor belt automatic sampling, and is cost-effective. Summary of the Invention

[0005] The purpose of this application is to provide a sample sealing container and a method for collecting, sealing, and transporting coal samples. This addresses the technical problems mentioned in the background art, such as the lack of humidity control and electrostatic protection in existing coal sample sealing containers leading to distortion of sample physicochemical properties, and the weak tamper-proof capability and lack of irreversible tampering evidence in traditional sealing structures.

[0006] To achieve the above objectives, this application adopts the following technical solution: A sample sealing container for sealing and transporting coal samples after collection, comprising: The container body has an inner cavity for holding the coal sample; A microporous membrane carrier assembly is disposed in the top region of the inner cavity. The microporous membrane carrier assembly forms a receiving space, which contains a moisture-absorbing filler. A microporous membrane is provided on the microporous membrane carrier assembly. The microporous membrane separates the moisture-absorbing filler from the gas space of the inner cavity, allowing only water vapor molecules to pass through while blocking solid particles and liquid water from passing through. A screw cap, located at the top of the container body, is used to seal the coal sample inside the container body; A tamper-evident unit, located on the cap and / or the container body, causes an irreversible change when the cap is improperly opened, providing verifiable evidence that the cap has been opened.

[0007] In one possible implementation, the container body is made of insulating material to block the influence of external electric fields on the coal sample inside the cavity.

[0008] In one possible implementation, the sample sealing container also includes a high-barrier shell, which covers the outside of the container body to prevent the penetration of external gases and water vapor.

[0009] In one possible implementation, the screw cap forms a first sealing structure, and the upper opening of the high-barrier outer shell forms a second sealing structure after being heat-sealed. The first sealing structure and the second sealing structure are independent of each other.

[0010] In one possible implementation, the tamper-proof unit includes a physical destructive component, an electronic recording component, and a chemical tracer. Physically destructive components undergo irreversible fractures when subjected to forces exceeding a preset threshold. Electronic records cannot be rewritten once the data has been written. Chemical tracers produce detectable changes in electrical state upon unpacking.

[0011] In one possible implementation, the physical breaking component is a disposable shearing ring cap, which is snapped into the joint between the cap and the container body. The neck of the disposable shearing ring cap has a weak fracture groove, which breaks and cannot be restored when the torque exceeds a preset threshold. The electronic record is a passive RFID tag, which is attached to the outer wall of a high-barrier housing. Its storage area is permanently locked after encrypted data is written to it. The chemical tracer is an tamper-evident circuit breaker. The tamper-evident circuit breaker is attached to the junction of the screw cap and the high-barrier outer shell. It has a built-in conductive circuit that breaks when the package is opened.

[0012] This application also provides a method for collecting, sealing, and transporting coal samples, using the sample sealing container described above, comprising the following steps: The coal sample is loaded into the inner cavity of the container body, and a gas space is reserved in the inner cavity; The humidity of the gas space is passively maintained within a preset range by using the moisture-absorbing filler and microporous membrane in the microporous membrane carrier assembly. The coal sample is sealed inside the container by screwing on the cap; An anti-tampering unit is provided on the cap and / or the container body. When the cap is opened abnormally, the anti-tampering unit produces an irreversible physical morphological change, and / or an irreversible electrical state change, and / or a visually identifiable chemical state change. Before laboratory testing, the changes in the state of the tamper-evident unit are used to verify whether the cap was opened abnormally during transport.

[0013] In one possible implementation, the method further includes covering the outside of the container body with a high-barrier shell, with a screw cap forming a first sealing structure, and the upper opening of the high-barrier shell forming a second sealing structure after heat sealing, wherein the first sealing structure and the second sealing structure are independent of each other.

[0014] In one possible implementation, the heat-sealing temperature of the upper opening of the high-barrier shell is 160~190℃, the heat-sealing time is 0.8~1.5s, and after heat sealing, a holding pressure of 0.05~0.1MPa is applied for cooling and shaping.

[0015] In one possible implementation, the hygroscopic filler is physically isolated from the coal sample, and the hygroscopic filler is selected from any one of magnesium nitrate hexahydrate, saturated sodium chloride crystals, or cobalt-doped color-changing silica gel.

[0016] Compared with the prior art, this application has the following beneficial effects: This application provides a sample sealing container and a method for collecting, sealing, and transporting coal samples. By setting a microporous membrane frame assembly, filling its containment space with hygroscopic filler and setting a microporous membrane, the preset humidity range of the inner cavity is maintained passively. This effectively avoids the problem of the physicochemical indicators such as moisture and volatile matter deviating from the original coal quality due to moisture absorption or water loss during the sealing and transport process. By setting an anti-tampering unit, irreversible changes occur when the cap is abnormally opened, providing multi-dimensional irreversible evidence of tampering, and technically preventing cheating behaviors such as tampering and adulteration.

[0017] In one possible implementation, the above-mentioned combination design of the microporous membrane carrier assembly, the moisture-absorbing filler, and the microporous membrane can achieve automatic humidity balance in the internal cavity without the need for external energy drive. It has a simple structure, low cost, and high reliability, making it suitable for large-scale use in belt automatic sampling scenarios.

[0018] In one possible implementation, the container body is made of insulating material, which can effectively block the influence of stray currents and triboelectric static electricity on the coal sample from the coal conveyor belt, avoid electrostatic adsorption and stratification of coal powder and loss of fine powder, and further ensure the representativeness of the test sample.

[0019] In one possible implementation, the first sealing structure formed by the screw cap and the second sealing structure formed by the heat seal of the upper opening of the high-barrier outer shell are independent of each other. Removing the outer seal does not damage the inner seal, while removing the inner seal will inevitably damage the outer seal. This double-blocks the single unsealing cheating path and greatly improves the anti-tampering capability.

[0020] In one possible implementation, the tamper-proof unit integrates three tamper-proof methods: physical destructive components, electronic recording components, and chemical tracers, forming a triple irreversible tamper-proof evidence chain of mechanical, electrical, and chemical means. Any single act of opening the package will leave at least one verifiable trace of damage, significantly reducing the concealment of cheating.

[0021] In one possible implementation, the electronic record uses a passive RFID tag, which does not require a built-in battery and can operate by relying on the reader's radio frequency power supply. It has no risk of failure during long-term storage, low operating cost, and is permanently locked after being written, ensuring the authenticity and immutability of the sampled data.

[0022] In one possible implementation, the coal sample collection, sealing and transportation method provided in this application can realize fully automated operation from automatic quantitative sample dropping, double-layer independent sealing, anti-tamper component binding and data latching to laboratory three-level verification. No manual intervention is required throughout the process, effectively eliminating the space for cheating in the human operation process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a sample sealing container provided in this application.

[0024] The attached figures are labeled as follows: 1. Container body; 2. High-barrier outer shell; 3. Screw cap; 4. First microporous membrane carrier frame; 5. Second microporous membrane carrier frame; 6. Moisture-absorbing filler; 7. Microporous membrane; 8. Disposable sheared ring cap. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0026] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] like Figure 1 As shown, this application provides a sample sealing container for sealing and transporting coal samples after collection. The sample sealing container mainly includes a container body 1, a high-barrier outer shell 2, a screw cap 3, a first microporous membrane frame 4, a second microporous membrane frame 5, a moisture-absorbing filler 6, a microporous membrane, and an anti-tamper unit. The container body 1 is a cylindrical structure with an inner cavity for containing the coal sample. The high-barrier outer shell 2 covers the outside of the container body 1 to prevent the permeation of external gases and moisture. The screw cap 3 is located at the upper opening of the container body 1, forming a first sealing structure. The upper opening of the high-barrier outer shell 2 is heat-sealed to form a second sealing structure. The anti-tamper unit includes a physical destructive component, an electronic recording component, and a chemical tracer component.

[0032] In this embodiment, as a preferred embodiment of the container body 1, the container body 1 is an electrically insulating inner liner, integrally injection molded from a polymer insulating material. The insulating inner liner is a cylindrical sealed cavity with an annular mounting port at the top for fixing the first microporous membrane carrier 4 and the second microporous membrane carrier 5. The bottom is flat to accommodate automated conveyor belt transport, and the upper opening has a standard snap-fit ​​docking structure to match the conveyor belt discharge short pipe. Preferably, the nominal effective volume of the insulating inner liner is available in three sizes: 100mL, 180mL, and 250mL. The 180mL specification is used for conventional conveyor belt sampling, with a single quantitative sample drop of 120mL, leaving 8%~15% head space. Preferably, the insulating inner liner is integrally injection molded from polytetrafluoroethylene (PTFE) with a uniform wall thickness of 1.8mm and a volume resistivity ≥10¹³Ω·cm, completely isolating stray currents and static electricity on site, avoiding electrostatic adsorption and stratification of coal powder; at the same time, it is resistant to acid and alkali corrosion in coal and does not chemically react with the coal sample to contaminate the sample.

[0033] In one possible embodiment, the high-barrier shell 2 is an integral thermoformed shell of PET / aluminum foil / PE three-layer composite film with a total thickness of 0.20~0.35mm, oxygen permeability ≤0.01cm³ / (m²·24h), and water vapor permeability ≤0.005g / (m²·24h), which can completely block external oxygen, water vapor and electromagnetic interference.

[0034] In this embodiment, the sample sealing container further includes a humidity control unit. A first microporous membrane frame 4 is disposed in the top region of the inner cavity of the container body 1, and a second microporous membrane frame 5 is disposed below the first microporous membrane frame 4. A receiving space is formed between the first microporous membrane frame 4 and the second microporous membrane frame 5, and the hygroscopic filler 6 is filled in this receiving space. A microporous membrane is disposed on the second microporous membrane frame 5, separating the hygroscopic filler 6 from the gas space of the inner cavity. The humidity control unit is only in communication with the gas in the head space inside the container body 1, and is physically isolated from the coal sample contained at the bottom of the inner cavity, so that the hygroscopic filler 6 and liquid will not fall and contaminate the sample.

[0035] In one possible embodiment, the microporous membrane is a hydrophilic modified polypropylene / PTFE membrane with a thickness of 50~150μm, a micropore diameter of 0.05~0.20μm, and an effective permeable membrane area of ​​10~25cm², allowing only the free exchange of water vapor molecules while blocking the permeation of coal sample particles and liquid water. The assembly process of the first microporous membrane frame 4 and the second microporous membrane frame 5 is as follows: select the corresponding moisture-absorbing filler 6 according to the working conditions and fill it into the space between the first microporous membrane frame 4 and the second microporous membrane frame 5; use 28kHz ultrasonic heat sealing to seal the edges of the frame, with a sealing width ≥3mm; weigh and calibrate each buffer bladder filler, with an error control of ±0.05g, and automatically reject unqualified products.

[0036] In this embodiment, the moisture-absorbing filler 6 is selected from chemical substances or compounds capable of maintaining the relative humidity of the internal gas space within a specific range. Specifically, the moisture-absorbing filler 6 is selected from one of the following three modalities: Mode 1: Magnesium nitrate hexahydrate, with an equilibrium relative humidity of 50%~55%RH, suitable for high humidity areas in southern China during the plum rain season, high volatile bituminous coal, and short-term transportation (≤24h).

[0037] Mode 2: Saturated sodium chloride crystals, with an equilibrium relative humidity of 75%RH, suitable for short-distance transportation (≤48h) of lignite in dry and low-temperature winters in northern regions and medium-sized power plants.

[0038] Modal 3: Cobalt-doped color-changing silica gel, with an equilibrium relative humidity of 60%~70%RH, suitable for long-distance inter-provincial transport, port storage, and third-party testing and arbitration samples. Normally blue, it turns pink after water or moisture intrusion due to seal damage, providing direct visual evidence of chemical tampering.

[0039] In one possible embodiment, after the coal sample is placed into the sample sealing container, the volume of the material occupies 85% to 92% of the total volume of the container body 1, with the remaining 8% to 15% of the head space serving as a humidity buffer gas exchange area.

[0040] In this embodiment, the screw cap 3 is a plastic screw cap with a built-in composite aluminum foil sealing gasket. The aluminum foil on the surface of the gasket blocks water vapor and oxygen, while the inner elastic rubber layer achieves a tight seal. A pre-drilled groove is provided on the edge of the screw cap 3 for securing physically destructive components in the tamper-evident unit. The automated sealing parameters for the screw cap 3 are: mechanical swing arm torque 2~3 N·m, hot-pressing temperature 170~200℃, and pressure holding time 0.5~1.2s. After the screw cap 3 is tightened, the aluminum foil gasket is completely fitted to the top of the container body 1, with no gas gaps. The heat-sealing process parameters for the top of the high-barrier outer shell 2 are: constant temperature of the heat-sealing module 160~190℃, and heat-sealing time 0.8~1.5s. After heat sealing, the container is cooled to room temperature (25℃) while a pressure of 0.05~0.1MPa is applied to prevent the composite film from curling up or developing micro-gaps due to cooling. The first sealing structure formed by the cap 3 and the second sealing structure formed by the heat seal at the top of the high-barrier outer shell 2 are independent of each other. Removing the outer heat seal film will not damage the inner cap seal, and removing the cap 3 will inevitably tear the outer shell, thus doubly blocking the single unsealing cheating path.

[0041] In one possible embodiment, the tamper-proof unit includes a physical destructive component, an electronic recording component, and a chemical tracer, all of which are irreversible. The physical destructive component is a one-piece shearing ring cap 7, integrally molded from rigid plastic, which is snapped into place at the junction of the screw cap 3 and the container body 1. The neck of the shearing ring is provided with a weak fracture groove, which will break directly when the torque is greater than 3.5 N·m. After the breakage, it cannot be restored and there is no possibility of secondary bonding repair. The integrity of the ring can be directly observed with the naked eye during transportation and handover.

[0042] In one possible embodiment, the electronic recorder is a passive RFID tag, such as an NFC tag, affixed to the outer wall of the high-barrier housing 2. During the sealing process, the PLC device writes encrypted data in one go: sampling device number, sampling time, coal type and batch, sample weight, and ambient temperature and humidity. After writing, the chip storage area is permanently locked, and cannot be erased, overwritten, or modified. No battery is required; it relies on the reader's RF power supply, and there is no risk of failure during long-term storage.

[0043] In one possible embodiment, the chemical tracer is an tamper-evident circuit breaker sticker, attached to the junction of the screw cap 3 and the high-barrier outer shell 2. The substrate has built-in conductive lines; once the outer shell is opened or cut, the conductive lines break directly, and a portable detector can quickly identify the circuit break. Simultaneously, the color-changing silicone buffer bladder of mode three serves as auxiliary chemical evidence; when sealed properly, it remains blue, turning pink when leaking or becoming damp, allowing for visual prediction of seal failure before opening the cap.

[0044] In this embodiment of the application, a method for collecting, sealing, and transporting coal samples using the above-mentioned sample sealing container is also provided, comprising the following four stages: Phase 1: Automated Mechanical Docking and Quantitative Sampling. Batch-sealed containers are placed in the automatic hopper of the sampling machine. The equipment's clamping mechanism automatically grabs the containers, locking them into the discharge pipe of the coal conveyor belt, and mechanically locking them in place. When the conveyor system reaches the set sampling cycle, the PLC outputs a signal to open the discharge valve, allowing the coal sample to fall vertically into the inner cavity of container body 1 under gravity. A photoelectric sensor is built into the inner cavity sidewall; the system immediately closes the discharge valve when coal accumulates and blocks light. The standard sample volume is 120 mL, with a head space of 10%~12%.

[0045] Phase 2: Double-layer automated sealing operation. A three-axis swing arm vertically presses down on the cap 3, while a torque controller stably outputs 2~3 N·m to tighten the cap 3, achieving the first layer of airtight isolation. A conveyor belt transports the container to the heat-sealing station at a constant speed of 0.1 m / s. The heat-sealing head maintains a constant temperature of 175℃±5℃, contacting the upper opening of the high-barrier outer shell 2 for 1 second to complete the heat sealing. Subsequently, a 25℃ cooling station applies 0.08 MPa pressure for 0.5 seconds to eliminate internal stress in the composite membrane.

[0046] Phase 3: Simultaneous binding and data locking of anti-tamper evidence. The ring cap 7 is automatically snapped into place on the outer ring of the screw cap 3 upon one-time cutting. An NFC reader / writer performs near-field radio frequency writing of all sampled raw data; upon completion, the chip automatically locks the storage area. An anti-tamper circuit breaker is applied across the seam between the screw cap 3 and the high-barrier outer shell 2. A unique QR code is printed on the side of the outer shell; each QR code is individually bound to the NFC data.

[0047] Phase 4: Three-tiered laboratory verification. After the container is transferred to the laboratory, it undergoes three-tiered verification in sequence. Failure to pass any one tier results in the sample being deemed invalid. Level 1 Physical Visual Inspection: 1. Observe whether the disposable shearing ring cap 7 is intact; 2. Check whether the conductive layer of the anti-tamper break sticker is broken or peeling; 3. Select a container with a modal three silicone buffer bladder and observe the color of the silicone. Pink indicates that the seal has failed.

[0048] Level 2 NFC electronic data verification: Using a portable reader to approach the passive RFID tag: 1. Unable to read data → Sample invalid; 2. Verification code does not match QR code → Determined to be tampered with; 3. Incomplete data → Sample invalid.

[0049] Level 3 temperature and humidity validity verification: Read the equilibrium humidity of the container head space and compare it with the standard humidity range. If it exceeds ±10%RH, it is determined that there is a micro-leakage in the seal and the sample is invalid.

[0050] In one possible embodiment, the complete manufacturing and assembly process of the above-mentioned sample sealing container is as follows: (1) Basic component molding: PTFE raw material injection molded container body 1, screw cap 3, first microporous membrane carrier frame 4, second microporous membrane carrier frame 5; PET / AL / PE composite film thermoformed high barrier shell 2.

[0051] (2) Buffer bag preparation: Select the corresponding moisture-absorbing filler 6 according to the working conditions and put it into the space between the first microporous membrane frame 4 and the second microporous membrane frame 5. Seal it and weigh and screen it precisely.

[0052] (3) Pre-assembly and integration: Insert the first microporous membrane carrier 4 and the second microporous membrane carrier 5 into the top slot of the container body 1 to cover the microporous membrane; perform vacuum leak testing on the whole machine.

[0053] (4) Automatic quantitative sample dispensing: PLC controls the dispensing, and photoelectric sensor controls the valve closing, accurately controlling the standard sample volume of 120mL.

[0054] (5) First inner seal: The swing arm presses down on the cap with a standard torque of 2.5 N·m to complete the seal.

[0055] (6) Second external heat seal: heat seal the upper opening of the high-barrier outer shell 2 at a constant temperature of 175℃ for 1 second, and then cool and pressurize to shape.

[0056] (7) Anti-tamper component binding: Insert the disposable cutting ring cover 7; write data and lock it with the NFC reader; paste the anti-tamper circuit breaker sticker; print the QR code.

[0057] (8) Automatic sorting of finished products: intact containers enter the transfer box, and unqualified products are automatically diverted for rework.

[0058] In one possible embodiment, the sample sealing container and coal sample collection, sealing and transportation method provided in this application can be applied to the following scenarios: Example 1: Sampling of high-humidity bituminous coal conveyor belt in a southern power plant environment with high volatile matter content. The moisture-absorbing packing material 6 was magnesium nitrate hexahydrate, with an equilibrium humidity of 50%~55%RH. The storage container was 180mL, with a sample capacity of 120mL and a headspace of 11%. Sealing parameters: capping torque 2.2 N·m, high-barrier outer shell 2 heat-sealing at 170℃ for 1 second. Applicable transport time: short-distance transport within the plant area within 24 hours.

[0059] Example 2: Winter sampling of lignite from a northern open-pit coal mine. The moisture-absorbing packing material 6 was selected from saturated sodium chloride crystals, with an equilibrium humidity of 75% RH. The container size was 250 mL. The heat-sealing temperature was increased to 180℃, and the pressure-holding and cooling time was extended. Applicable scenario: Transfer from the mining area to a nearby coking plant within 48 hours.

[0060] Example 3: Long-distance, inter-regional transshipment of foreign trade coal at the port. The moisture-absorbing filler 6 uses cobalt-doped color-changing silica gel. Anti-tampering components upgraded: thickened shear ring, double-layer circuit breaker. Mandatory laboratory verification sequence: first observe the silica gel color – check the shear ring and circuit breaker – read NFC data – verify the humidity of the head space; any abnormality directly determines the sample as fraudulent and invalid.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A sample sealing container for sealing and transporting coal samples after collection, characterized in that, include: The container body (1) has an inner cavity for containing the coal sample; A microporous membrane carrier assembly is disposed in the top region of the inner cavity. The microporous membrane carrier assembly forms a receiving space, which contains a moisture-absorbing filler (6). A microporous membrane is provided on the microporous membrane carrier assembly. The microporous membrane separates the moisture-absorbing filler (6) from the gas space of the inner cavity, allowing only water vapor molecules to pass through while blocking solid particles and liquid water from passing through. A screw cap (3) is provided at the upper opening of the container body (1) to seal the coal sample inside the container body (1); An anti-tamper unit is disposed on the cap (3) and / or the container body (1). The anti-tamper unit produces an irreversible change when the cap (3) is abnormally opened, so as to provide verifiable evidence that the cap (3) has been opened.

2. The sample sealing container according to claim 1, characterized in that, The container body (1) is made of insulating material to block the influence of external electric field on the coal sample in the inner cavity.

3. The sample sealing container according to claim 1, characterized in that, It also includes a high-barrier shell (2), which covers the outside of the container body (1) to block the penetration of external gases and water vapor.

4. The sample sealing container according to claim 3, characterized in that, The screw cap (3) constitutes a first sealing structure, and the upper opening of the high-barrier outer shell (2) constitutes a second sealing structure after being heat-sealed. The first sealing structure and the second sealing structure are independent of each other.

5. The sample sealing container according to claim 1, characterized in that, The tamper-proof unit includes a physical destructive component, an electronic recording component, and a chemical tracer; the physical destructive component undergoes an irreversible fracture when subjected to force exceeding a preset threshold; the electronic recording component cannot be rewritten after data is written; and the chemical tracer generates a detectable change in electrical state when the device is unsealed.

6. The sample sealing container according to claim 5, characterized in that, The physical breaking component is a disposable shearing ring cap (7), which is snapped into the joint between the screw cap (3) and the container body (1). Its neck is provided with a weak fracture groove, which breaks and cannot be restored when the torque exceeds a preset threshold. The electronic record is a passive radio frequency tag, which is attached to the outer wall of the high barrier housing (2), and its storage area is permanently locked after encrypted data is written. The chemical tracer is an anti-tamper circuit breaker sticker, which is attached to the junction of the screw cap (3) and the high-barrier outer shell (2). It has a built-in conductive circuit, which breaks when the seal is opened.

7. A method for collecting, sealing, and transporting coal samples, characterized in that, Using the sample sealing container according to any one of claims 1 to 6, the steps include: The coal sample is loaded into the inner cavity of the container body (1), and a gas space is reserved in the inner cavity; The humidity of the gas space is maintained within a preset range in a passive manner through the moisture-absorbing filler (6) in the microporous membrane carrier assembly and the microporous membrane; The coal sample is sealed inside the container body (1) by screwing on the cap (3); An anti-tamper unit is provided on the screw cap (3) and / or the container body (1). The anti-tamper unit produces an irreversible physical morphological change, and / or an irreversible electrical state change, and / or a visually identifiable chemical state change when the screw cap (3) is abnormally opened. Before laboratory testing, the state changes of the anti-tamper unit are used to verify whether the screw cap (3) was abnormally opened during the transfer process.

8. The method for collecting, sealing, and transporting coal samples according to claim 7, characterized in that, The method further includes covering the outside of the container body (1) with a high-barrier shell (2), the screw cap (3) forming a first sealing structure, and the upper opening of the high-barrier shell (2) forming a second sealing structure after heat sealing, wherein the first sealing structure and the second sealing structure are independent of each other.

9. The method for collecting, sealing, and transporting coal samples according to claim 8, characterized in that, The temperature for heat sealing the upper opening of the high-barrier shell (2) is 160~190℃, the heat sealing time is 0.8~1.5s, and after heat sealing, a holding pressure of 0.05~0.1MPa is applied for cooling and shaping.

10. The method for collecting, sealing, and transporting coal samples according to claim 7, characterized in that, The hygroscopic filler (6) is physically isolated from the coal sample. The hygroscopic filler (6) is selected from any one of magnesium nitrate hexahydrate, saturated sodium chloride crystals, or cobalt-doped color-changing silica gel.

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