Integrated rice rapid sampling and moisture on-line detection device

Abstract

This invention belongs to the field of rice testing, specifically an integrated rapid rice sampling and online moisture detection device, comprising: a sampling device body with a tube for sampling and transporting rice grains; and a detection device body installed outside the sampling device body, with a detection chamber and a mounting groove sequentially formed from top to bottom inside the detection device body. By relying on the synergistic effect of a micro-airflow discharge mechanism and a grain-interval homogenization mechanism, the micro-airflow layer trapped between rice grains can be effectively broken. The precise negative pressure control of the micro-negative pressure adsorption module, combined with the air permeability and grain-blocking characteristics of the honeycomb breathable plate, enables the directional and efficient discharge of air between grains. The flexible compaction and constant pressure holding function of the elastic pressure plate assembly further homogenizes the grain-interval gaps and discharges residual trace airflow, effectively solving the problems of false drying in traditional thermal drying methods and uneven electric field distribution in capacitance methods, thus improving the accuracy and stability of rice moisture detection.

Description

Technical Field

[0001] This invention relates to the field of rice testing, specifically an integrated device for rapid rice sampling and online moisture detection. Background Technology

[0002] Moisture content in rice is a core indicator for assessing rice quality, storage safety, and processing suitability. Accurate moisture detection is crucial for grain grading during procurement, moisture and mold prevention during storage, and optimization of processing techniques. Currently, the main methods for rice moisture detection include the heat drying loss method and the capacitance method.

[0003] During the thermal drying weight loss method, after the rice sample is placed into the detection chamber, numerous tiny gaps naturally form between the grains. The air trapped within these gaps creates a micro-airflow interlayer. This interlayer interferes with the detection results in two ways: first, it hinders the diffusion of internal moisture from the rice grains to the surface, prolonging the drying cycle and reducing detection efficiency; second, the airflow itself absorbs a large amount of heat as it heats up, interfering with the accuracy of the weight loss calculation and easily leading to false drying, where the sample surface appears to have reached a constant weight state, but the internal moisture has not actually been completely released, ultimately resulting in a detection value lower than the true moisture content. In the capacitance method for moisture content detection, the principle is based on the difference in dielectric constant between rice grains (containing moisture) and air. Moisture content is calculated by measuring changes in the electric field inside the detection chamber. However, the micro-airflow trapped between rice grains severely disrupts the uniformity of the electric field within the detection chamber, causing significant fluctuations in the capacitance measurement. Furthermore, the volume of this micro-airflow expands or contracts slightly with changes in temperature and air pressure in the detection environment, further exacerbating the measurement deviation of the dielectric constant and ultimately distorting the final moisture content calculation. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, such as the inability to expel the micro-airflow interlayer formed by the retention of a small amount of air, this invention proposes an integrated rapid rice sampling and online moisture detection device.

[0005] The technical solution adopted by this invention to solve its technical problem is: an integrated rice rapid sampling and online moisture detection device, comprising: The main body of the sampling device is equipped with a tube for sampling and conveying rice grains; The main body of the testing equipment is installed outside the main body of the sampling equipment. The main body of the testing equipment has a testing cavity and a mounting groove arranged from top to bottom. The outer wall of the main body of the testing equipment also has a heating sleeve mounting position. The testing cavity is connected to the tube body. A micro-airflow discharge mechanism is installed in the mounting groove of the main body of the detection equipment. The micro-airflow discharge mechanism includes a honeycomb-shaped breathable plate, a manifold box, and a micro negative pressure adsorption module. The honeycomb-shaped breathable plate is fixedly connected to the bottom of the detection chamber. The manifold box is sealed and installed in the mounting groove and is in contact with the lower surface of the honeycomb-shaped breathable plate. The micro negative pressure adsorption module is sealed and connected to the top interface of the manifold box. The intergranular gap homogenization mechanism is installed on the top of the main body of the detection equipment and is used to compact and homogenize the rice sample in the detection chamber; The thermostatic anti-backflow sealing mechanism is installed around the outside of the main body of the testing equipment and the top of the testing chamber to achieve constant temperature control and sealing to prevent backflow in the testing chamber.

[0006] Preferably, the micro airflow discharge mechanism further includes an airflow guide hole, a discharge pipe, a one-way valve, a pressure sensor, and an electromagnetic control valve, and the micro negative pressure adsorption module includes a micro vacuum pump and a connecting pipe; The upper surface of the manifold box has a connecting hole that matches the honeycomb vent plate. The top of the manifold box has a sealing groove and a sealing ring. The middle of the top of the manifold box has an inlet that matches the connecting pipe. The pressure sensor is fixedly installed on the inner wall of the manifold box, the electromagnetic control valve is connected in series on the connecting pipe between the micro vacuum pump and the manifold, and the one-way valve is fixedly installed on the outer ring of the discharge pipe located in the inner cavity of the airflow guide hole.

[0007] Preferably, the honeycomb breathable plate is made of stainless steel, and the surface of the honeycomb breathable plate has breathable holes arranged in a regular hexagonal array.

[0008] Preferably, the interparticle gap homogenization mechanism includes an elastic pressure plate assembly, a drive unit, and a pressure sensor. The drive unit includes a motor, a reciprocating screw, and a guide rod. The motor is fixed to the top of the main body of the detection equipment by a bracket, and drives the reciprocating screw to move the elastic pressure plate assembly up and down along the guide rod.

[0009] Preferably, the elastic pressure plate assembly includes a silicone rubber contact layer and an aluminum alloy substrate. The bottom of the silicone rubber contact layer is provided with three rings of annular array protrusions, and the pressure sensor is fixedly installed at the center of the top of the elastic pressure plate assembly.

[0010] Preferably, the constant temperature anti-backflow sealing mechanism includes a heating sleeve, an annular pressure ring, and a pressure stabilizing and balancing hole. The heating sleeve adopts a composite structure of ceramic heating element, aluminum silicate insulation layer and stainless steel shell, and is fixedly installed at the heating sleeve mounting position and fits against the outer wall of the main body of the testing equipment.

[0011] Preferably, the annular pressure ring is fixedly connected to the outer ring of the aluminum alloy substrate in the elastic pressure plate assembly and is in contact with and fits against the inner wall of the detection cavity.

[0012] Preferably, the pressure stabilizing and balancing hole is opened on the top side wall of the detection chamber, and a one-way breathable membrane is provided on one side of the pressure stabilizing and balancing hole. The one-way breathable membrane is pressed and fixed to the outer surface of the pressure stabilizing and balancing hole by a pressure cap.

[0013] Preferably, the front of the main body of the testing equipment is connected to a double door via a hinge, and a handle is fixedly connected to the double door. The handle is used to open the double door to clean the inside of the main body of the testing equipment.

[0014] The advantages of this invention are: 1. This invention effectively breaks down the micro-airflow interlayer trapped between rice grains by relying on the synergistic effect of the micro-airflow discharge mechanism and the inter-grain gap homogenization mechanism. The precise negative pressure control of the micro negative pressure adsorption module, combined with the air permeability and grain-blocking characteristics of the honeycomb breathable plate, enables the directional and efficient discharge of air between grains. The flexible compaction and constant pressure holding function of the elastic pressure plate component can further homogenize the gaps between rice grains and discharge residual trace airflow, effectively solving the technical problems of false drying phenomenon in traditional thermal drying methods and uneven electric field distribution in capacitance method detection, thus improving the accuracy and stability of rice moisture detection results.

[0015] 2. This invention, through the adoption of an integrated sampling and testing configuration, coupled with a constant-temperature anti-backflow sealing mechanism, enables continuous operation of rice sampling, transportation, and testing, reducing the manual sample transfer process and shortening the pre-testing time. The composite structure of the heating jacket's ceramic heating element, aluminum silicate insulation layer, and stainless steel shell allows for rapid and precise temperature control of the testing chamber; the double-sealed anti-backflow design of the one-way breathable membrane and annular pressure ring effectively blocks interference from external air and water vapor to the testing chamber; the double-door structure of the main body of the testing equipment facilitates internal cleaning and maintenance, significantly improving the device's testing efficiency and ease of operation and maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of an integrated rice rapid sampling and online moisture detection device according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the main body of the integrated rice rapid sampling and online moisture detection device of the present invention; Figure 3This is a schematic diagram of the micro-airflow discharge mechanism of an integrated rice rapid sampling and online moisture detection device according to the present invention; Figure 4 This is a cross-sectional schematic diagram of the manifold of an integrated rice rapid sampling and online moisture detection device according to the present invention. Figure 5 This is a schematic diagram of the intergranular gap homogenization mechanism of an integrated rice rapid sampling and online moisture detection device according to the present invention. Figure 6 This is a schematic diagram of the aluminum alloy substrate of the integrated rice rapid sampling and online moisture detection device of the present invention; Figure 7 This is a schematic diagram of the constant temperature anti-backflow sealing mechanism of an integrated rice rapid sampling and moisture online detection device according to the present invention; Figure 8 This is a schematic diagram of the main body of the detection device of the integrated rice rapid sampling and online moisture detection device of the present invention.

[0018] In the diagram: 100, Sampling equipment body; 110, Tube body; 200, Detection equipment body; 210, Detection chamber; 220, Mounting slot; 230, Heating jacket mounting position; 240, Double door; 241, Handle; 300, Micro airflow discharge mechanism; 310, Honeycomb breathable plate; 320, Manifold box; 321, Sealing ring; 322, Inlet; 330, Miniature vacuum pump; 331, Connecting pipe; 340, Airflow guide hole; 350, Discharge pipe; 3 60. One-way valve; 370. Pressure sensor; 380. Electromagnetic control valve; 400. Particle gap homogenization mechanism; 410. Motor; 411. Reciprocating screw; 412. Guide rod; 420. Silicone rubber contact layer; 421. Aluminum alloy substrate; 422. Protrusion; 430. Pressure sensor; 500. Constant temperature anti-backflow sealing mechanism; 510. Heating jacket; 520. Annular pressure ring; 530. Pressure stabilizing and balancing hole; 531. One-way breathable membrane; 532. Pressure cap. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, an integrated rapid sampling and online moisture detection device for rice includes: The sampling equipment body 100 is equipped with a tube 110 for sampling and conveying rice grains. The main body of the testing equipment 200 is installed outside the main body of the sampling equipment 100. The main body of the testing equipment 200 has a testing cavity 210 and a mounting groove 220 arranged from top to bottom inside. The outer wall of the main body of the testing equipment 200 also has a heating sleeve mounting position 230. The testing cavity 210 is connected to the tube body 110. The micro airflow discharge mechanism 300 is installed in the mounting groove 220 of the main body 200 of the detection equipment. The micro airflow discharge mechanism 300 includes a honeycomb breathable plate 310, a manifold box 320 and a micro negative pressure adsorption module. The honeycomb breathable plate 310 is fixedly connected to the bottom of the detection chamber 210. The manifold box 320 is sealed and installed in the mounting groove 220 and is attached to and connected to the lower surface of the honeycomb breathable plate 310. The micro negative pressure adsorption module is sealed and connected to the top interface of the manifold box 320. The intergranular gap homogenization mechanism 400 is installed on the top of the main body 200 of the detection equipment and is used to compact and homogenize the rice sample in the detection chamber 210. The constant temperature anti-backflow sealing mechanism 500 is installed around the outside of the main body 200 of the testing equipment and the top of the testing chamber 210 to achieve constant temperature control and sealing to prevent backflow of the testing chamber 210.

[0021] Continue as Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the micro-airflow discharge mechanism 300 also includes an airflow guide hole 340, a discharge pipe 350, a one-way valve 360, a pressure sensor 370, and an electromagnetic control valve 380. The micro negative pressure adsorption module includes a micro vacuum pump 330 and a connecting pipe 331. The upper surface of the manifold box 320 has a connecting hole that matches the honeycomb breathable plate 310. The top of the manifold box 320 has a sealing groove and a sealing ring 321 is embedded therein. The middle of the top of the manifold box 320 has a connecting hole that matches the honeycomb breathable plate 310. The connector 331 is fitted with an inlet 322; the pressure sensor 370 is fixedly installed on the inner wall of the manifold box 320; the electromagnetic control valve 380 is connected in series on the connecting pipe 331 between the micro vacuum pump 330 and the manifold box 320; the one-way valve 360 ​​is fixedly installed on the outer ring of the discharge pipe 350 located in the inner cavity of the airflow guide hole 340; the honeycomb vent plate 310 is made of stainless steel, and the surface of the honeycomb vent plate 310 has vent holes arranged in a regular hexagonal array.

[0022] In this embodiment, rice grains are transported to the detection chamber 210 of the detection equipment body 200 via the sampling device body 100 and the tube 110. When the sample filling height in the detection chamber 210 reaches a preset value, the sampling device body 100 stops operating. After the rice grains enter the detection chamber 210 within the detection equipment body 200, the micro-airflow discharge mechanism 300 is activated, and its micro-vacuum pump 330 operates, evacuating the manifold box 320 through the connecting pipe 331. Because the upper surface of the manifold box 320 is sealed to the lower surface of the honeycomb breathable plate 310 through the sealing ring 321, the air pressure inside the chamber drops rapidly. The pressure sensor 370 installed on the inner wall of the manifold box 320 collects pressure data in real time and feeds it back to the control system. When the negative pressure reaches a preset value, the electromagnetic control valve 380 connected in series on the connecting pipe 331 automatically adjusts to a stable opening, controlling the negative pressure fluctuation within a reasonable range. The micro-airflow trapped between the rice grains is evacuated by the air pressure... Driven by differential pressure, the airflow passes sequentially through the hexagonal vent holes of the honeycomb-shaped permeable plate 310 and the connecting hole of the manifold box 320 into the cavity, and then exits the device through the airflow guide hole 340 and the discharge pipe 350. The one-way valve 360 ​​installed on the outer ring of the discharge pipe 350 conducts one-way traffic to ensure that the discharged airflow cannot be re-entered. After the micro-airflow discharge process is completed, the micro vacuum pump 330 stops running and the electromagnetic control valve 380 closes to cut off the gas path. By using precise negative pressure control, the efficient and directional discharge of the micro-airflow trapped between rice grains is achieved, greatly improving the discharge efficiency and completely eliminating the obstruction of moisture diffusion by the airflow interlayer in traditional detection. In addition, the vent hole diameter of the honeycomb-shaped permeable plate 310 is smaller than the minimum rice grain diameter, achieving exhaust without grain discharge and avoiding sample loss. The dual anti-backflow design of the one-way valve 360 ​​and the electromagnetic control valve 380 ensures that the discharged micro-airflow will not re-enter the detection cavity 210, ensuring the stability of the internal environment of the detection cavity 210.

[0023] like Figure 5 and Figure 6 As shown, the interparticle gap homogenization mechanism 400 includes an elastic pressure plate assembly, a drive unit, and a pressure sensor 430. The drive unit includes a motor 410, a reciprocating screw 411, and a guide rod 412. The motor 410 is fixed to the top of the main body 200 of the detection equipment by a bracket, and drives the reciprocating screw 411 to move the elastic pressure plate assembly up and down along the guide rod 412. The elastic pressure plate assembly includes a silicone rubber contact layer 420 and an aluminum alloy substrate 421. The bottom of the silicone rubber contact layer 420 is provided with three rings of annular array protrusions 422. The pressure sensor 430 is fixedly installed at the center of the top of the elastic pressure plate assembly.

[0024] In this embodiment, after the micro-airflow is discharged, the inter-particle gap homogenization mechanism 400 is activated. Its motor 410 drives the reciprocating screw 411 to rotate, causing the elastic pressure plate assembly to descend smoothly along the guide rod 412. When the bottom protrusion 422 of the silicone rubber contact layer 420 of the elastic pressure plate assembly contacts the surface of the rice sample, the pressure sensor 430 installed at the center of the top of the pressure plate collects and feeds back the compaction pressure data in real time. Based on the pressure feedback value, the speed of the motor 410 is adjusted to slowly increase the compaction pressure to a preset value. Subsequently, the motor 410 stops descending and enters a constant pressure holding state. The pressure holding time is related to subsequent constant temperature detection. Synchronized with time, the three-ring array of protrusions 422 at the bottom of the pressure plate are embedded in the gaps between rice grains, forming micro-airflow channels to further expel the trace amounts of airflow remaining during the compaction process. The flexible properties of the silicone rubber contact layer 420, combined with the protrusion design 422, do not damage the rice grains during compaction. Precise pressure maintenance keeps the gap ratio between rice grains stable, significantly reducing gap unevenness and completely eliminating secondary airflow stagnation. The guiding action of the guide rod 412 ensures that the downward direction of the pressure plate is consistent with the axis of the detection chamber 210, avoiding local over- or under-compaction and providing a uniform and stable sample state for subsequent moisture detection.

[0025] like Figure 1 and Figure 7 As shown, the constant temperature anti-backflow sealing mechanism 500 includes a heating jacket 510, an annular pressure ring 520, and a pressure stabilizing and balancing hole 530. The heating jacket 510 adopts a composite structure of ceramic heating element, aluminum silicate insulation layer and stainless steel shell, and is fixedly installed in the heating jacket mounting position 230 and fits against the outer wall of the main body 200 of the detection equipment. The annular pressure ring 520 is fixedly connected to the outer ring of the aluminum alloy substrate 421 in the elastic pressure plate assembly and is in contact with the inner wall of the detection chamber 210. The pressure stabilizing and balancing hole 530 is opened in the top side wall of the detection chamber 210. A one-way breathable membrane 531 is provided on one side of the pressure stabilizing and balancing hole 530. The one-way breathable membrane 531 is pressed and fixed to the outer surface of the pressure stabilizing and balancing hole 530 by a pressure cap 532.

[0026] In this embodiment, while the intergranular gap homogenization mechanism 400 is pressure-maintaining and starting, the constant temperature anti-backflow sealing mechanism 500 is also activated. Its heating jacket 510 is powered on, and the heat generated by the internal ceramic heating element is transferred to the detection chamber 210 through the side wall of the main body 200 of the detection equipment. The aluminum silicate insulation layer effectively reduces heat loss, and the stainless steel outer shell prevents burns to the operator. The heating power is adjusted in real time based on temperature feedback data to stabilize the temperature inside the detection chamber 210 at a preset value. During the detection process, water vapor generated by the evaporation of rice moisture is discharged through the pressure stabilizing and balancing hole 530 on the top side wall of the detection chamber 210. The one-way breathable membrane 531 installed on the outer surface of the pressure stabilizing and balancing hole 531 only allows water vapor to exit in one direction, preventing external air backflow. Simultaneously, the outer ring of the elastic pressure plate assembly... The annular pressure ring 520 fits tightly against the inner wall of the detection chamber 210, further enhancing the sealing performance of the detection chamber 210. The moisture detection sensor (existing detector, not described in detail here) in the main body 200 of the detection equipment collects real-time data on changes in the weight of the rice. When the rice reaches a constant weight, the detection is considered complete. The composite structure of the heating jacket 510 enables rapid and accurate temperature control of the detection chamber 210, which significantly improves efficiency compared to traditional heating methods. Precise temperature control ensures a stable rate of moisture evaporation in the rice, avoiding false drying caused by temperature fluctuations. The double-sealed anti-backflow design of the one-way breathable membrane 531 and the annular pressure ring 520 blocks external air and water vapor from interfering with the detection chamber 210. The final detection result error meets the requirements of the national rice moisture detection standard.

[0027] like Figure 8 As shown, the front of the main body 200 of the testing equipment is connected to a double door 240 via a hinge. A handle 241 is fixedly connected to the double door 240. The handle 241 is used to open the double door 240 to clean the inside of the main body 200 of the testing equipment.

[0028] In this embodiment, after the test is completed, the control system sequentially shuts down the heating jacket 510 and the pressure sensor 430, starts the motor 410 to reverse, and drives the elastic pressure plate assembly to the initial standby position. The operator opens the double door 240 through the handle 241, takes out the dried rice sample in the test chamber 210, cleans the surface of the honeycomb breathable plate 310 to remove residual sample debris, closes the double door 240 after cleaning, and the equipment returns to standby state, waiting for the next test. The elastic pressure plate assembly automatically resets to avoid damage to the pressure plate structure caused by manual operation. The hinge design of the double door 240 and the setting of the handle 241 make it convenient for the operator to quickly clean the test chamber 210. After cleaning, the equipment re-forms a sealed space to ensure the stability and accuracy of subsequent tests.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An integrated device for rapid rice sampling and online moisture detection, characterized in that, include: The main body of the sampling equipment (100) is provided with a tube (110) for sampling and conveying rice. The main body of the testing equipment (200) is installed outside the main body of the sampling equipment (100). The main body of the testing equipment (200) has a testing cavity (210) and a mounting groove (220) arranged from top to bottom inside. The outer wall of the main body of the testing equipment (200) also has a heating sleeve mounting position (230). The testing cavity (210) is connected to the tube body (110). A micro-airflow discharge mechanism (300) is installed in the mounting groove (220) of the main body (200) of the detection equipment. The micro-airflow discharge mechanism (300) includes a honeycomb breathable plate (310), a manifold box (320) and a micro negative pressure adsorption module. The honeycomb breathable plate (310) is fixedly connected to the bottom of the detection chamber (210). The manifold box (320) is sealed and installed in the mounting groove (220) and is in contact with the lower surface of the honeycomb breathable plate (310). The micro negative pressure adsorption module is sealed and connected to the top interface of the manifold box (320). The intergranular gap homogenization mechanism (400) is installed on the top of the main body (200) of the detection equipment and is used to compact and homogenize the rice sample in the detection chamber (210); The constant temperature anti-backflow sealing mechanism (500) is installed around the outside of the main body (200) of the testing equipment and the top of the testing chamber (210) to achieve constant temperature control and sealing to prevent backflow of the testing chamber (210).

2. The integrated rice rapid sampling and online moisture detection device according to claim 1, characterized in that: The micro airflow discharge mechanism (300) also includes an airflow guide hole (340), a discharge pipe (350), a one-way valve (360), a pressure sensor (370), and an electromagnetic control valve (380). The micro negative pressure adsorption module includes a micro vacuum pump (330) and a connecting pipe (331). The upper surface of the manifold box (320) is provided with a connecting hole that matches the honeycomb breathable plate (310). The top of the manifold box (320) is provided with a sealing groove and a sealing ring (321) is embedded. The middle of the top of the manifold box (320) is provided with an inlet (322) that matches the connecting pipe (331). The pressure sensor (370) is fixedly installed on the inner wall of the manifold box (320), the electromagnetic control valve (380) is connected in series on the connecting pipe (331) between the micro vacuum pump (330) and the manifold (320), and the one-way valve (360) is fixedly installed on the outer ring of the discharge pipe (350) located in the inner cavity of the airflow guide hole (340).

3. The integrated rice rapid sampling and online moisture detection device according to claim 2, characterized in that: The honeycomb breathable plate (310) is made of stainless steel, and the surface of the honeycomb breathable plate (310) is provided with breathable holes arranged in a regular hexagonal array.

4. The integrated rice rapid sampling and online moisture detection device according to claim 1, characterized in that: The interparticle gap homogenization mechanism (400) includes an elastic pressure plate assembly, a drive unit, and a pressure sensor (430). The drive unit includes a motor (410), a reciprocating screw (411), and a guide rod (412). The motor (410) is fixed to the top of the main body (200) of the detection equipment by a bracket, and drives the reciprocating screw (411) to move the elastic pressure plate assembly up and down along the guide rod (412).

5. The integrated rice rapid sampling and online moisture detection device according to claim 4, characterized in that: The elastic pressure plate assembly includes a silicone rubber contact layer (420) and an aluminum alloy substrate (421). The bottom of the silicone rubber contact layer (420) is provided with three ring array bumps (422). The pressure sensor (430) is fixedly installed at the center of the top of the elastic pressure plate assembly.

6. The integrated rice rapid sampling and online moisture detection device according to claim 1, characterized in that: The constant temperature anti-backflow sealing mechanism (500) includes a heating sleeve (510), an annular pressure ring (520) and a pressure stabilizing and balancing hole (530). The heating sleeve (510) adopts a composite structure of ceramic heating element, aluminum silicate insulation layer and stainless steel shell, and is fixedly installed at the heating sleeve mounting position (230) and fits against the outer wall of the main body (200) of the testing equipment.

7. The integrated rice rapid sampling and online moisture detection device according to claim 6, characterized in that: The annular pressure ring (520) is fixedly connected to the outer ring of the aluminum alloy substrate (421) in the elastic pressure plate assembly and is in contact with the inner wall of the detection cavity (210).

8. The integrated rice rapid sampling and online moisture detection device according to claim 6, characterized in that: The pressure stabilizing and balancing hole (530) is opened on the top side wall of the detection chamber (210). A one-way breathable membrane (531) is provided on one side of the pressure stabilizing and balancing hole (530). The one-way breathable membrane (531) is pressed and fixed to the outer surface of the pressure stabilizing and balancing hole (530) by a pressure cap (532).

9. The integrated rice rapid sampling and online moisture detection device according to claim 1, characterized in that: The front of the main body (200) of the testing equipment is connected to a double door (240) via a hinge. A handle (241) is fixedly connected to the double door (240). The handle (241) is used to open the double door (240) to clean the inside of the main body (200) of the testing equipment.

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