Closed constant humidity type belt push rod type coal sample splitting device and full water compensation method

Abstract

The application provides a closed constant-humidity belt push rod type coal sample splitting device and a full water compensation method. The device comprises a closed splitting box, a horizontal conveying mechanism, a transverse push rod splitting mechanism, a constant-humidity circulation system and a self-adaptive control system. A closed splitting chamber is formed in the closed splitting box. The horizontal conveying mechanism is arranged in the closed splitting chamber. The transverse push rod splitting mechanism is arranged in the closed splitting chamber. The transverse push rod splitting mechanism comprises at least two groups of transversely arranged push rods and a driving unit for driving the push rods. Four openings, including a top feeding port, a storage and checking sample discharging port, a full water sample discharging port and a terminal waste discharging port, are formed in the closed splitting box. A group of double-stage flap valves is arranged at each of the four openings. The constant-humidity circulation system is arranged in the closed splitting box. One technical effect of the application is that the industry pain point of water loss during the preparation of full water samples can be solved, and the device is suitable for a secondary splitting station of a full-automatic sampling and preparation line.

Description

Technical Field

[0001] This invention belongs to the field of coal quality testing technology, specifically relating to a closed, constant humidity belt pusher type coal sample reduction device and a total moisture compensation method. Background Technology

[0002] Total moisture content in coal is a core pricing indicator in coal trade settlement, directly affecting the economic interests of both supply and demand sides. According to the requirements of GB / T 211-2017 "Determination of Total Moisture in Coal" and GB / T 474-2008 "Preparation Method of Coal Samples", the preparation of coal samples with total moisture content must follow the principle of "first reducing the sample and then drying it", and the entire preparation process should minimize moisture loss to maintain the original moisture state of the sample.

[0003] In fully automated sampling systems, crushed coal samples are fed into a secondary reduction equipment via a robotic arm, transported by a horizontal belt conveyor, and then periodically cut off complete coal flow sections by transverse pushers to prepare storage samples and total moisture samples, which is the mainstream process in the industry. However, existing reduction equipment generally suffers from the common problem of total moisture loss: Firstly, the drive unit of the push rod is mostly located outside the housing, and the push rod needs to pass through the side wall. The point of protrusion relies on a dynamic seal, which is difficult to achieve a reliable airtight seal, resulting in water vapor exchange between the inside and outside of the cavity.

[0004] Secondly, the inlet and outlet are mostly single-stage gates or normally open structures, and the cavity is directly open to the atmosphere when the coal enters or exits, which disrupts the internal humidity environment.

[0005] Third, there is a lack of active control over the humidity inside the cavity and compensation for moisture loss in the test results.

[0006] In summary, the aforementioned problems lead to continuous water loss during the preparation of the whole water sample, resulting in a lower measured total moisture content in the laboratory compared to the true value, which affects the fairness of pricing and the traceability of data. Therefore, there is an urgent need for a closed, constant-humidity belt-driven pusher-type coal sample reduction device and a total moisture compensation method to solve the above technical problems. Summary of the Invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a new technical solution for a closed constant humidity belt pusher coal sample reduction device and a total moisture compensation method.

[0008] According to a first aspect of the present invention, a fully enclosed, constant-humidity belt-driven pusher-type coal sample reduction device is provided, comprising: The sealed shrink-fit box and the horizontal conveying mechanism are provided. The sealed shrink-fit box forms a sealed shrink-fit chamber inside. The front of the sealed shrink-fit box is provided with a quick-opening sealed maintenance door. The horizontal conveying mechanism is located in the sealed shrink-fit chamber and extends along the length of the sealed shrink-fit box. A transverse push rod splitting mechanism is provided in the sealed splitting chamber. The transverse push rod splitting mechanism includes at least two sets of transversely arranged push rods and a drive unit for driving the push rods. The push rods are supported by the drive unit, span across the horizontal conveying mechanism, and transversely cut off the coal flow section on the horizontal conveying mechanism under the drive of the drive unit. The side wall of the sealed splitting box does not have openings for the push rods to pass through. The sealed, split-type housing has four openings: a top feed inlet, a sample storage outlet, a full water sample outlet, and an end waste outlet. The top feed inlet and the end waste outlet are located above the feed end and below the end of the horizontal conveying mechanism, respectively. The sample storage outlet and the full water sample outlet correspond to the material cutting positions of the two sets of push rods. Each of the four openings is equipped with a set of double-stage flap valves, forming a double-stage flap valve sealing group. Each double-stage flap valve includes an upper flap, a lower flap, and an intermediate buffer chamber located between them. A constant humidity circulation system and an adaptive control system are provided. The constant humidity circulation system is installed in the sealed partition box and is used to replenish water vapor in the sealed partition chamber. The horizontal conveying mechanism, the transverse push rod partitioning mechanism, the two-stage flap valve sealing group, and the constant humidity circulation system are electrically connected to the adaptive control system.

[0009] Optionally, the sealed, split-type housing is a fully welded stainless steel structure; the quick-opening, sealed inspection door is sealed to the sealed, split-type housing via a foamed silicone sealing strip.

[0010] Optionally, a weighing unit is provided below the sample outlet and the full water sample outlet, respectively. The weighing accuracy of the weighing unit is ±0.1g, and the weighing unit is electrically connected to the adaptive control system.

[0011] Optionally, the constant humidity circulation system includes an explosion-proof ultrasonic humidifier, a circulating fan, and a multi-point temperature and humidity sensor; the explosion-proof ultrasonic humidifier and the circulating fan are both installed on the side wall of the sealed partition box, and their outlets are connected to the sealed partition chamber; the circulating fan drives the air circulation within the sealed partition chamber; the multi-point temperature and humidity sensor is located within the sealed partition chamber and is evenly distributed along the length of the sealed partition box; the multi-point temperature and humidity sensor and the explosion-proof ultrasonic humidifier are both electrically connected to the adaptive control system, and the adaptive control system performs closed-loop adjustment of the output of the explosion-proof ultrasonic humidifier based on the average humidity measured by the multi-point temperature and humidity sensor.

[0012] Optionally, the top feed inlet is located at the top center of the sealed shrinkage box and matches the delivery coordinates of the robot arm; the at least two sets of push rods are a sample storage push rod located directly above the sample storage outlet and a full water sample push rod located directly above the full water sample outlet.

[0013] Optionally, the electrical components in the horizontal conveying mechanism, the transverse push rod splitting mechanism, the two-stage flap valve sealing group, and the constant humidity circulation system all adopt the Ex d IIB T4 Gb explosion-proof rating, and the power supply and control lines of the sealed splitting box are led out through the explosion-proof cable gland static seal.

[0014] According to a second aspect of the present invention, a method for full moisture compensation is provided, characterized in that it employs a fully enclosed constant humidity belt pusher type coal sample reduction device as described in the first aspect, comprising the following steps: Step S1, standby pre-adjustment: The relative humidity in the sealed partition chamber is stabilized at 95%–98% through continuous closed-loop operation of the constant humidity circulation system; Step S2, Sealed Feeding: The robotic arm puts the coal sample into the top feed port. The two-stage flap valve at the top feed port switches on and off alternately according to the set time sequence, sending the coal sample through the intermediate buffer chamber into the horizontal conveying mechanism in the sealed shrinking chamber. During the feeding process, the sealed shrinking chamber is not directly connected to the outside atmosphere. Step S3, constant humidity conveying and reduction: The coal sample is conveyed forward by the horizontal conveying mechanism. The at least two sets of push rods periodically cut off the coal flow cross section at a set frequency and fall into the storage sample outlet and the full water sample outlet respectively. The remaining coal flow is discharged from the end waste outlet. Step S4, closed discharge: The double-stage flap valve at the sample outlet, the double-stage flap valve at the full water sample outlet, and the double-stage flap valve at the end discharge port intermittently discharge the corresponding materials. The discharge process does not disrupt the constant humidity environment in the closed shrinkage chamber. Step S5, humidity closed-loop fine adjustment: The changes in the moisture content of the coal sample are compared in real time by the online infrared moisture meters at the feed end and the discharge end, and the set humidity of the constant humidity circulation system is adjusted accordingly. Step S6, Result Compensation and Correction: Based on the average temperature and humidity of the entire reduction process, the total residence time of the coal sample in the sealed reduction chamber, the coal type correction coefficient, and the total feed mass, calculate the total moisture loss of the entire process, compensate and correct the laboratory measured results of the full water sample, and then output and archive them.

[0015] Optionally, in step S1, the temperature difference between the air temperature in the sealed shrinkage chamber and the temperature of the fed coal sample is controlled to be ≤1℃, and the temperature of the inner wall of the sealed shrinkage box is controlled to be 2-3℃ higher than the dew point temperature.

[0016] Optionally, in step S2, the alternating switching sequence of each group of dual-stage flap valves is as follows: first, open the upper flap valve and close the lower flap valve to allow the coal sample to fall into the intermediate buffer chamber, then close the upper flap valve and open the lower flap valve to discharge material into the sealed shrinkage chamber.

[0017] Optionally, in step S5, if the online infrared moisture meter at the discharge end detects a slight increase in the moisture content of the coal sample, the set humidity will be lowered by 0.5%-1%; if a slight decrease in the moisture content of the coal sample is detected, the set humidity will be raised by 0.5%-1%, so that the net moisture exchange between the coal sample and the environment approaches zero.

[0018] One technical advantage of this invention is that: In this embodiment, the four aspects of "closed structure, environmental protection during material feeding and discharging, active humidity control, and closed-loop control" work together to achieve closed humidity control throughout the entire process of conveying and reducing the sample. This effectively solves the industry pain point of moisture distortion in the whole water sample preparation process and ensures the standard requirement of "reducing the sample before drying and minimizing moisture loss" for whole water coal samples. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a fully enclosed, constant humidity belt pusher type coal sample reduction device according to an embodiment of the present invention.

[0020] In the diagram: 1. Sealed split-type housing; 11. Sealed split-type chamber; 12. Top feed inlet; 13. Sample outlet; 14. Full water sample outlet; 15. End waste outlet; 2. Horizontal conveying mechanism; 3. Push rod; 4. Two-stage flap valve; 41. Upper flap; 42. Lower flap; 43. Intermediate buffer chamber; 5. Weighing unit; 61. Multi-point temperature and humidity sensor; 62. Explosion-proof ultrasonic humidifier; 63. Circulating fan; 7. Quick-opening sealed maintenance door. Detailed Implementation

[0021] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0022] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship 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.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] See Figure 1 This application provides a fully enclosed, constant-humidity belt-driven pusher-type coal sample reduction device, comprising: The sealed shrink-down box 1 and the horizontal conveying mechanism 2 are provided. The sealed shrink-down box 1 forms a sealed shrink-down chamber 11 inside. The front of the sealed shrink-down box 1 is provided with a quick-opening sealed maintenance door 7. The horizontal conveying mechanism 2 is disposed in the sealed shrink-down chamber 11 and extends along the length of the sealed shrink-down box 1. The horizontal conveying mechanism 2 can be a horizontal conveyor belt. The transverse push rod reduction mechanism is located in the sealed reduction chamber 11, including at least two sets of transversely arranged push rods 3 and a drive unit for driving the push rods 3. The push rods 3 are supported by the drive unit, span across the horizontal conveying mechanism 2, and can transversely cut the coal flow section on the horizontal conveying mechanism 2 under the drive of the drive unit; the side wall of the sealed reduction box 1 does not have an opening for the push rods 3 to pass through. The sealed, split-type housing 1 has four openings: a top feed inlet 12, a sample storage outlet 13, a full water sample outlet 14, and an end waste outlet 15. The top feed inlet 12 and the end waste outlet 15 are respectively located above the feed end and below the end of the horizontal conveying mechanism 2. The sample storage outlet 13 and the full water sample outlet 14 correspond to the material cutting position of the push rod 3. Each of the four openings is equipped with a set of double-stage flap valves 4, forming a double-stage flap valve sealing group. Each double-stage flap valve 4 includes an upper flap 41, a lower flap 42, and an intermediate buffer chamber 43 located between the two. A constant humidity circulation system and an adaptive control system are provided. The constant humidity circulation system is installed in the sealed shrinkage box 1 and is used to replenish water vapor into the sealed shrinkage chamber 11. The horizontal conveying mechanism 2, the transverse push rod shrinkage mechanism, the two-stage flap valve sealing group, and the constant humidity circulation system are electrically connected to the adaptive control system.

[0027] In the above embodiment, the horizontal conveying mechanism 2 and the transverse push rod splitting mechanism are integrally built into the sealed splitting chamber 11, and the side wall of the sealed splitting chamber 1 does not have an opening for the push rod 3 to pass through. This ensures that the movement of the drive unit and the push rod 3 is completely enclosed within the sealed splitting chamber 11, structurally eliminating the dynamic seal and leakage points required for the push rod to pass through the wall in conventional external drive schemes, thus giving the sealed splitting chamber 11 truly reliable airtightness. Moreover, in conjunction with the fully welded main body and the front quick-opening sealed inspection door 7, both airtightness and the reliability of manual cleaning and maintenance are taken into account.

[0028] Furthermore, each of the four openings is equipped with a set of two-stage flap valves 4 (upper flap 41, lower flap 42, and intermediate buffer chamber 43). When materials enter or exit, the intermediate buffer chamber 43 is switched on and off alternately, so that the sealed shrinkage chamber 11 is not directly connected to the outside atmosphere, and the constant humidity environment is not disrupted during the material entry and exit process.

[0029] In addition, the constant humidity circulation system continuously replenishes water vapor into the sealed reduction chamber 11 to maintain a near-saturated water vapor environment, significantly reducing the water vapor partial pressure difference between the coal sample surface and the environment, and inhibiting the evaporation of free moisture in the coal sample during the entire transportation and reduction process from a thermodynamic perspective; and the adaptive control system provides unified timing and closed-loop control for each actuator.

[0030] In summary, this invention achieves closed-loop humidity control throughout the entire conveying-splitting process by working together on four aspects: "closed structure, environmentally sound feeding and discharging, active humidity control, and closed-loop control." This effectively solves the industry pain point of moisture distortion in the whole-moisture sample preparation process and ensures that the whole-moisture coal sample meets the standard requirement of "splitting before drying to minimize moisture loss."

[0031] Optionally, the sealed, split-type housing 1 is a fully welded stainless steel structure; the quick-opening, sealed inspection door 7 is sealed to the sealed, split-type housing 1 by a foamed silicone sealing strip and a multi-point eccentric locking mechanism.

[0032] In the above embodiments, the all-welded stainless steel body has no risk of leakage at the joints, is corrosion-resistant and has high strength; the foamed silicone sealing strip has good compression resilience and aging resistance, so that the quick-opening sealing inspection door 7 achieves airtightness comparable to the welded body after closing, which not only ensures airtightness but also facilitates disassembly, cleaning and maintenance.

[0033] Optionally, a weighing unit 5 is provided below the sample outlet 13 and the full water sample outlet 14, respectively, with a weighing accuracy of ±0.1g. The weighing unit 5 is electrically connected to the adaptive control system.

[0034] In the above implementation, the weighing unit 5 collects the mass of the stored sample and the total water sample in real time and uploads it to the adaptive control system, providing feed / discharge mass data support for subsequent total water loss compensation calculation, thereby improving compensation accuracy and result traceability.

[0035] Optionally, the constant humidity circulation system includes an explosion-proof ultrasonic humidifier 62, a circulating fan 63, and a multi-point temperature and humidity sensor 61; the explosion-proof ultrasonic humidifier 62 and the circulating fan 63 are both installed on the side wall of the sealed partition box 1, and their outlets are both connected to the sealed partition chamber 11; the circulating fan 63 drives the air circulation in the sealed partition chamber 11; the multi-point temperature and humidity sensor 61 is located in the sealed partition chamber 11 and is evenly distributed along the length of the sealed partition box 1; the multi-point temperature and humidity sensor 61 and the explosion-proof ultrasonic humidifier 62 are both electrically connected to the adaptive control system; the adaptive control system performs closed-loop adjustment of the output of the explosion-proof ultrasonic humidifier 62 based on the average humidity measured by the multi-point temperature and humidity sensor 61.

[0036] In the above embodiment, the explosion-proof ultrasonic humidifier 62 and the circulating fan 63 are placed on the side wall and connected to the sealed shrinkage chamber 11 through the outlet. They replenish water vapor into the sealed shrinkage chamber 11 and drive the air to circulate at low speed, so that the humidity is evenly distributed and there are no dead corners. The multi-point temperature and humidity sensors 61 are evenly distributed along the length and take the average humidity as the feedback quantity. The adaptive control system adjusts the output of the explosion-proof ultrasonic humidifier 62 in a closed loop according to this, so as to achieve accurate and stable control of the humidity of the sealed shrinkage chamber 11, and the low-speed airflow does not interfere with the coal flow pattern and shrinkage action.

[0037] Optionally, the top feed inlet 12 is located at the top center of the sealed shrinkage box 1 and matches the delivery coordinates of the robot arm; the at least two sets of push rods 3 are respectively the sample storage push rod 3 located directly above the sample storage outlet 13 and the full water sample push rod 3 located directly above the full water sample outlet 14.

[0038] In the above implementation, the feed inlet is centered and matched with the robot arm's placement coordinates to achieve precise positioning and feeding without interfering with the robot arm's movements; the two sets of push rods 3 correspond to two sampling ports respectively, ensuring that a complete coal flow cross-section is captured each time, and the reduction precision meets the requirements of GB / T 474-2008.

[0039] Optionally, the electrical components in the horizontal conveying mechanism 2, the transverse push rod splitting mechanism, the two-stage flap valve sealing group, and the constant humidity circulation system all adopt the Ex d IIB T4 Gb explosion-proof mark, and the power supply and control lines of the sealed splitting box 1 are led out through the explosion-proof cable gland static seal.

[0040] In the above embodiments, the electrical components meet the explosion-proof requirements of explosion-proof type, gas class IIB, temperature group T4, and protection level Gb. The power supply and control lines are led out through explosion-proof cable glands with static seals and no leakage path, so that the device can be safely used in explosive environments containing flammable media and eliminate the risk of electrical ignition.

[0041] Optionally, embodiments of this application also provide a method for total moisture compensation, employing the above-described apparatus, including: Step S1, standby pre-adjustment: The relative humidity in the sealed partition chamber 11 is stabilized at 95%–98% through continuous closed-loop operation of the constant humidity circulation system; Step S2, closed feeding: The robotic arm puts the coal sample into the top feed port 12. The double-stage flap valve 4 at the top feed port 12 switches on and off alternately according to the set time sequence, sending the coal sample through the intermediate buffer chamber 43 into the horizontal conveying mechanism 2 in the closed shrinking chamber 11. During the feeding process, the closed shrinking chamber 11 is not directly connected to the outside atmosphere. Step S3, constant humidity conveying and reduction: The coal sample is conveyed forward by the horizontal conveying mechanism 2. The at least two sets of push rods 3 cut off the coal flow section at a set frequency and fall into the storage sample outlet 13 and the full water sample outlet 14 respectively. The remaining coal flow is discharged from the end waste outlet 15. Step S4, closed discharge: The double-stage flap valve 4 at the sample outlet 13, the double-stage flap valve 4 at the full water sample outlet 14, and the double-stage flap valve 4 at the end discharge outlet 15 intermittently discharge the corresponding materials. The discharge process does not disrupt the constant humidity environment in the closed shrinkage chamber 11. Step S5, humidity closed-loop fine adjustment: The changes in the moisture content of the coal sample are compared in real time by the online infrared moisture meters at the feed end and the discharge end, and the set humidity of the constant humidity circulation system is adjusted accordingly. Step S6, Result Compensation and Correction: Based on the average temperature and humidity of the entire reduction process, the total residence time of the coal sample in the sealed reduction chamber 11, the coal type correction coefficient, and the total feed mass, calculate the total moisture loss of the entire process, compensate and correct the laboratory test results of the full water sample, and then output and archive them.

[0042] In the above implementation, the system maintains constant humidity during standby, keeps the entire process of material feeding and discharging in a closed environment, and conducts the conveying and fractionation in near-saturated water vapor. This makes the thermodynamic driving force (water vapor partial pressure difference) for the evaporation of free water extremely weak, and significantly reduces water loss throughout the process. The real-time feedback from the online infrared moisture meter enables the system to adaptively fine-tune humidity, and the compensation and correction make the final detection results traceable and correctable, ensuring the original moisture state of the entire water sample from both the process and algorithm perspectives.

[0043] Optionally, in step S1, the temperature difference between the air temperature in the sealed shrinkage chamber and the temperature of the fed coal sample is controlled to be ≤1℃, and the temperature of the inner wall of the sealed shrinkage box is controlled to be 2-3℃ higher than the dew point temperature.

[0044] In the above implementation, the material-air temperature difference is limited to suppress water loss caused by the sensible heat exchange between the coal sample and the air, and the wall temperature is controlled above the dew point to prevent condensation from dripping back onto the coal sample. This ensures that the device "only suppresses water loss and does not add extra external moisture to the coal sample," avoiding the side effect of constant humidity increasing humidity.

[0045] Optionally, in step S2, the alternating switching sequence of each set of dual-stage flap valves is as follows: first, open the upper flap valve and close the lower flap valve to allow the coal sample to fall into the intermediate buffer chamber, then close the upper flap valve and open the lower flap valve to discharge material into the sealed shrinkage chamber.

[0046] In the above implementation, the upper and lower flaps open and close alternately, and the intermediate buffer chamber is isolated, so that the sealed and divided chamber is not directly connected to the outside at any time, minimizing the humidity fluctuation caused by coal exchange and ensuring a stable constant humidity environment.

[0047] Optionally, in step S5, if the online infrared moisture meter at the discharge end detects a slight increase in the moisture content of the coal sample, the set humidity will be lowered by 0.5%-1%; if a slight decrease in the moisture content of the coal sample is detected, the set humidity will be raised by 0.5%-1%, so that the net moisture exchange between the coal sample and the environment approaches zero.

[0048] In the above implementation, the humidity setting is adjusted by two-way small step increments based on the change in output moisture content, dynamically approaching the equilibrium point of "zero net moisture exchange", further improving the accuracy of suppressing water loss and compensating for the trace moisture drift that is difficult to completely avoid.

[0049] Optionally, the total water loss compensation amount is calculated using the following formula: M c = M m +ΔM ΔM = K×(100%) RH avg )×t total In the formula, M c This is the corrected total moisture value, in %; M m RH represents the laboratory measured total moisture content of the whole water sample, expressed as %; ΔM represents the total moisture loss compensation value, expressed as %; K represents the coal type correction coefficient, expressed as % / (%·min), representing the total moisture loss rate of the coal sample per unit humidity difference and unit residence time. avg The average relative humidity within the fully enclosed, partitioned chamber, expressed in % (t). total This represents the total residence time of the coal sample within the sealed, narrowed chamber, expressed in minutes.

[0050] For example, the calibration method for the coal type correction factor K is as follows: (a) Take a coal sample to be tested and determine the initial moisture content M0; (b) The coal sample is subjected to a complete transport-splitting process in a closed splitting chamber with fixed temperature and humidity, and the total water content M1 of the resulting total water sample is determined. (c) From ΔM = M0 M1 calculates the total water loss in a single occurrence; (d) From K = ΔM / [(100% RH avg ) × t total Calculate the K value for this type of coal. (e) Repeat steps (a)–(d) multiple times and take the average value as the coal type correction factor K for that coal type.

[0051] In the above implementation, the compensation model quantifies the moisture loss throughout the entire process using "humidity difference × residence time × coal type coefficient", and through actual measurement and calibration of K, the compensation value ΔM can be calculated, calibrated, and traced, significantly improving the authenticity and correctability of the total moisture detection results.

[0052] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A fully enclosed, constant-humidity belt-driven pusher-type coal sample reduction device, characterized in that, include: The sealed shrink-fit box and the horizontal conveying mechanism are provided. The sealed shrink-fit box forms a sealed shrink-fit chamber inside. The front of the sealed shrink-fit box is provided with a quick-opening sealed maintenance door. The horizontal conveying mechanism is located in the sealed shrink-fit chamber and extends along the length of the sealed shrink-fit box. A transverse push rod splitting mechanism is provided in the sealed splitting chamber. The transverse push rod splitting mechanism includes at least two sets of transversely arranged push rods and a drive unit for driving the push rods. The push rods are supported by the drive unit, span across the horizontal conveying mechanism, and transversely cut off the coal flow section on the horizontal conveying mechanism under the drive of the drive unit. The side wall of the sealed splitting box does not have openings for the push rods to pass through. The sealed, split-type housing has four openings: a top feed inlet, a sample storage outlet, a full water sample outlet, and an end waste outlet. The top feed inlet and the end waste outlet are located above the feed end and below the end of the horizontal conveying mechanism, respectively. The sample storage outlet and the full water sample outlet correspond to the material cutting positions of the two sets of push rods. Each of the four openings is equipped with a set of double-stage flap valves, forming a double-stage flap valve sealing group. Each double-stage flap valve includes an upper flap, a lower flap, and an intermediate buffer chamber located between them. A constant humidity circulation system and an adaptive control system are provided. The constant humidity circulation system is installed in the sealed partition box and is used to replenish water vapor in the sealed partition chamber. The horizontal conveying mechanism, the transverse push rod partitioning mechanism, the two-stage flap valve sealing group, and the constant humidity circulation system are electrically connected to the adaptive control system.

2. The fully enclosed constant humidity belt pusher type coal sample reduction device according to claim 1, characterized in that, The sealed, partitioned enclosure is made of fully welded stainless steel; the quick-opening, sealed inspection door is connected to the sealed, partitioned enclosure by a foamed silicone sealing strip.

3. The fully enclosed constant humidity belt pusher type coal sample reduction device according to claim 1, characterized in that, Weighing units are respectively provided below the sample outlet and the full water sample outlet. The weighing accuracy of the weighing units is ±0.1g, and the weighing units are electrically connected to the adaptive control system.

4. The fully enclosed constant humidity belt pusher type coal sample reduction device according to claim 1, characterized in that, The constant humidity circulation system includes an explosion-proof ultrasonic humidifier, a circulating fan, and multi-point temperature and humidity sensors. Both the explosion-proof ultrasonic humidifier and the circulating fan are installed on the side wall of the sealed, partitioned housing, and their outlets are connected to the sealed, partitioned chamber. The circulating fan drives the air circulation within the sealed, partitioned chamber. The multi-point temperature and humidity sensors are located within the sealed, partitioned chamber and are evenly distributed along the length of the sealed, partitioned housing. Both the multi-point temperature and humidity sensors and the explosion-proof ultrasonic humidifier are electrically connected to the adaptive control system. The adaptive control system performs closed-loop adjustment of the output of the explosion-proof ultrasonic humidifier based on the average humidity measured by the multi-point temperature and humidity sensors.

5. The fully enclosed constant humidity belt pusher type coal sample reduction device according to claim 1, characterized in that, The top feed inlet is located at the top center of the sealed shrinking box and matches the delivery coordinates of the robot arm; the at least two sets of push rods are a sample storage push rod located directly above the sample storage outlet and a full water sample push rod located directly above the full water sample outlet.

6. The fully enclosed constant humidity belt pusher type coal sample reduction device according to claim 1, characterized in that, The electrical components of the horizontal conveying mechanism, the transverse push rod splitting mechanism, the double-stage flap valve sealing group, and the constant humidity circulation system all adopt the Ex d IIB T4 Gb explosion-proof rating. The power supply and control lines of the sealed splitting box are led out through the explosion-proof cable gland static seal.

7. A method for total moisture compensation, characterized in that, The fully enclosed, constant-humidity belt-driven pusher coal sample reduction device as described in claim 1 includes the following steps: Step S1, standby pre-adjustment: The relative humidity in the sealed partition chamber is stabilized at 95%–98% through continuous closed-loop operation of the constant humidity circulation system; Step S2, Sealed Feeding: The robotic arm puts the coal sample into the top feed port. The two-stage flap valve at the top feed port switches on and off alternately according to the set time sequence, sending the coal sample through the intermediate buffer chamber into the horizontal conveying mechanism in the sealed shrinking chamber. During the feeding process, the sealed shrinking chamber is not directly connected to the outside atmosphere. Step S3, constant humidity conveying and reduction: The coal sample is conveyed forward by the horizontal conveying mechanism. The at least two sets of push rods periodically cut off the coal flow cross section at a set frequency and fall into the storage sample outlet and the full water sample outlet respectively. The remaining coal flow is discharged from the end waste outlet. Step S4, closed discharge: The double-stage flap valve at the sample outlet, the double-stage flap valve at the full water sample outlet, and the double-stage flap valve at the end discharge port intermittently discharge the corresponding materials. The discharge process does not disrupt the constant humidity environment in the closed shrinkage chamber. Step S5, humidity closed-loop fine adjustment: The changes in the moisture content of the coal sample are compared in real time by the online infrared moisture meters at the feed end and the discharge end, and the set humidity of the constant humidity circulation system is adjusted accordingly. Step S6, Result Compensation and Correction: Based on the average temperature and humidity of the entire reduction process, the total residence time of the coal sample in the sealed reduction chamber, the coal type correction coefficient, and the total feed mass, calculate the total moisture loss of the entire process, compensate and correct the laboratory measured results of the full water sample, and then output and archive them.

8. The method according to claim 7, characterized in that, In step S1, the temperature difference between the air temperature in the sealed shrinkage chamber and the temperature of the fed coal sample is controlled to be ≤1℃, and the temperature of the inner wall of the sealed shrinkage box is controlled to be 2-3℃ higher than the dew point temperature.

9. The method according to claim 7, characterized in that, In step S2, the alternating switching sequence of each group of dual-stage flap valves is as follows: first, the upper flap valve is opened and the lower flap valve is closed to allow the coal sample to fall into the intermediate buffer chamber; then, the upper flap valve is closed and the lower flap valve is opened to discharge material into the sealed shrinkage chamber.

10. The method according to claim 7, characterized in that, In step S5, if the online infrared moisture meter at the discharge end detects a slight increase in the moisture content of the coal sample, the set humidity will be lowered by 0.5%-1%; if a slight decrease in the moisture content of the coal sample is detected, the set humidity will be raised by 0.5%-1%, so that the net moisture exchange between the coal sample and the environment approaches zero.

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