Grain capacity measuring instrument with inertia gap

Abstract

The application relates to the technical field of grain bulk density determination, and specifically discloses a grain bulk density determination instrument adopting an inertial gap, which comprises a box body, a feeding hopper is arranged on the inner top wall of the box body, a storage cylinder is communicated with the lower end of the feeding hopper, an opening and closing assembly is arranged on the outer circumferential wall of the storage cylinder, a material taking opening is arranged on the side wall of the box body, a storage box is slidably arranged at the material taking opening, and a bulk density determination mechanism is arranged below the storage cylinder; a certain amount of grain enters the storage cylinder through the feeding hopper, the opening and closing assembly controls the opening and closing of the lower end of the storage cylinder, so that the grain falls into the bulk density determination mechanism, the bulk density determination mechanism uniformly stacks and determines the bulk density of the grain, after the measurement is completed, the grain falls into the storage box, the storage box is taken out from the material taking opening to recycle the grain, the whole process is automatically completed in the same box body, action differences caused by manual sample loading, scraping, weighing and other steps are reduced, and the repeatability and accuracy of the bulk density determination are improved.

Description

Technical Field

[0001] This application relates to the field of grain bulk density measurement technology, and in particular to a grain bulk density measuring instrument using inertial clearance. Background Technology

[0002] Grain bulk density refers to the mass of grain per unit volume. It is a core physical indicator for measuring grain quality grade, assessing processing yield, and evaluating storage stability. In the grain procurement process, it directly affects pricing. In storage management, it is a key parameter for determining whether grain is suitable for storage. In processing and international trade, it is also an important basis for quality assessment. Furthermore, the consistency and repeatability of bulk density measurement are essential to ensure uniform and comparable quality judgments for the same batch of grain. It is also a scientific basis for fair pricing and trade arbitration. If the consistency and repeatability are poor, the data of the same batch of samples will be contradictory, which will directly lead to pricing errors, trade disputes, and misjudgments of storage safety. Therefore, grain bulk density meters, as specialized equipment for performing this test, are widely used in grain quality inspection agencies at all levels, grain depots, processing enterprises, and third-party testing laboratories. The accuracy of its measurement results is directly related to fair trade and food security.

[0003] In existing technologies, grain bulk density analyzers typically consist of precision components such as a frame, funnel, intermediate cylinder, exhaust hammer, capacity cylinder, weighing instrument, and a special scraper. During measurement, the funnel is fixed at the top of the frame, the intermediate cylinder is connected below the funnel, and the capacity cylinder is mounted on a holder at the bottom of the intermediate cylinder. The exhaust hammer is placed on one side of the capacity cylinder and can rotate around its axis to strike the outer wall of the cylinder. The weighing instrument is set up independently for final weighing. The funnel is used to hold the sample to be tested and guide the grain into the intermediate cylinder. The intermediate cylinder acts as a buffer and guide, allowing the grain to enter the capacity cylinder at a stable and uniform flow rate. The exhaust hammer strikes a specific part of the outer wall of the capacity cylinder a specified number of times, causing the grain inside the cylinder to vibrate and compact, eliminating excessive gaps. The capacity cylinder is the core component for accurate volume measurement, and the scraper is used to scrape off excess grain from the cylinder opening to ensure a constant volume.

[0004] Regarding the aforementioned technologies, since the striking force of the exhaust hammer is a point-like or localized impact force that propagates from the outside of the cylinder wall to the inside, this force attenuates and is transmitted along a specific path within the particle packing, resulting in a significant difference in the force on the grains in the central and edge areas of the cylinder. This uneven force state makes it difficult for samples from different batches to achieve a truly consistent packing structure, directly affecting the repeatability and representativeness of the measurement. At the same time, the entire measurement process requires operators to complete multiple steps sequentially, which is not only time-consuming and labor-intensive for each test, but also requires a high degree of proficiency and consistency in the operator's technique. Any slight difference in any step may be amplified into a deviation in the final bulk density value, making it difficult to meet the actual needs of large-scale, high-efficiency, and high-accuracy testing. Therefore, improvements are needed. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a grain bulk density measuring instrument employing inertial clearance.

[0006] The grain bulk density measuring instrument using inertial clearance provided in this application adopts the following technical solution: A grain bulk density measuring instrument employing inertial clearance includes a housing. A feeding hopper is provided on the inner top wall of the housing, and a storage cylinder is connected to the lower end of the feeding hopper. An opening and closing assembly for opening and closing the lower end of the storage cylinder is provided on the outer peripheral wall of the storage cylinder. A material dispensing port is provided on the side wall of the housing, and a storage box is slidably disposed at the material dispensing port and slidably disposed on the inner bottom wall of the housing. A bulk density measuring mechanism for uniformly stacking grain and measuring its bulk density is provided below the storage cylinder.

[0007] By adopting the above technical solution, grain enters the storage cylinder through the feeding hopper. The opening and closing component controls the opening and closing of the lower end of the storage cylinder. After a certain amount of grain has entered the storage cylinder, the grain falls into the bulk density measuring mechanism. The bulk density measuring mechanism evenly piles the grain and measures its bulk density. After the measurement is completed, the grain falls into the storage box. The storage box is taken out from the discharging port to recover the grain. The entire feeding, piling, measuring and discharging process is integrated into the same box and completed automatically. This reduces manual operation links and reduces the action differences caused by manual sample loading, leveling and weighing steps. It improves the repeatability and accuracy of bulk density measurement. At the same time, the closed box structure effectively suppresses dust and improves the working environment.

[0008] Optionally, the opening and closing assembly includes a mounting plate, a lead screw motor, and a baffle. The mounting plate is disposed on the outer peripheral wall of the lower end of the storage cylinder, the lead screw motor is disposed on the upper end of the mounting plate, a socket is provided on the outer peripheral wall of the lower end of the storage cylinder, and the baffle is threaded to the outer peripheral wall of the lead screw motor lead screw and is slidably disposed on the upper end of the mounting plate and in the socket.

[0009] By adopting the above technical solution, before the grain is poured into the feeding hopper, the lead screw motor is started. The lead screw of the motor rotates, causing the baffle to slide on the mounting plate and close the opening at the bottom of the storage cylinder. Then, a certain amount of grain is poured into the storage cylinder through the feeding hopper. When it is necessary to discharge all the grain in the storage cylinder into the bulk density measuring mechanism, the lead screw motor drives the baffle to open the opening at the bottom of the storage cylinder, so that the grain falls into the capacity cylinder evenly with a stable flow rate and speed. This reduces the initial accumulation difference caused by the fluctuating flow rate when manually opening the gate to discharge the grain, and creates highly uniform initial conditions for subsequent uniform accumulation, which helps to improve the repeatability of bulk density measurement data between batches.

[0010] Optionally, the bulk density measuring mechanism includes a measuring cylinder, a mounting frame, a support plate, a guide plate, guide columns, a lifting motor, a transmission component, a fixing frame, an electric gripper, a separating assembly, and a weighing assembly. The mounting frame is disposed on the inner bottom wall of the housing, and two sets are symmetrically arranged. The two ends of the support plate are rotatably mounted on the inner side walls of the two sets of mounting frames. The measuring cylinder is vertically mounted on the upper end of the support plate. The guide plate is horizontally mounted on the outer peripheral wall of the measuring cylinder. The guide columns are vertically mounted on the upper end of the support plate, and two sets are symmetrically arranged. The two sets of guide columns are slidably connected to the two ends of the guide plate. The fixing frame is disposed on the inner bottom wall of the box body, the lifting motor is disposed on the upper end of the fixing frame, the electric gripper is slidably disposed on the side wall of the fixing frame for clamping the upper end of the capacity cylinder, one end of the transmission component is disposed on the output end of the lifting motor, and the other end is fixedly connected to the electric gripper, and the electric gripper is driven to move up and down by the lifting motor, the separating component is disposed on the upper end of the support plate for separating the grain in the capacity cylinder, and the weighing component is disposed below the support plate for weighing the grain in the capacity cylinder.

[0011] By adopting the above technical solution, when it is necessary to discharge the grain in the storage cylinder into the capacity cylinder, the electric gripper is activated, and the electric gripper stably clamps the upper end of the capacity cylinder. Then, the lifting motor is activated, and the lifting motor drives the electric gripper and the capacity cylinder to rise through the transmission component, so that the upper end of the capacity cylinder is pressed against the lower end of the storage cylinder. Then, all the grain is discharged into the capacity cylinder. After all the grain is discharged into the capacity cylinder, the lifting motor, transmission component and electric gripper are used to lower the capacity cylinder to the specified height. After the capacity cylinder is stable, the electric gripper releases the capacity cylinder, so that the capacity cylinder can fall freely under the sliding cooperation of the guide plate and guide column until it collides with the support plate. The impact of free fall causes all grains to be simultaneously subjected to inertial forces of equal magnitude and parallel to the gravity line at the moment of landing, and indiscriminate shearing and rearrangement occur simultaneously on the entire cross-section. The traditional radial gradient stacking structure, characterized by a dense center and loose edges due to shearing caused by point-by-point hammering, is transformed into an isotropic and stable stacking structure with a uniform compaction mechanism and consistent stacking degree throughout. Furthermore, the impact energy of each impact is entirely determined by the drop height, unaffected by manual manipulation. This results in a stacking state with uniform radial and axial height within a batch and consistent between batches, improving the repeatability, accuracy, and automation of bulk density measurements. The sliding fit of the guide plate and guide column provides rigid constraints for the free fall of the capacity cylinder, ensuring that the cylinder moves along a single vertical axis. This prevents tilting, swaying, or lateral displacement of the cylinder during the fall, thus preventing uneven distribution of impact force at the bottom of the cylinder, radial differences in the inertial force of the grains, and batch-to-batch fluctuations caused by random differences in the fall posture. This provides a rigid mechanical guarantee for the consistency and repeatability of data between batches.

[0012] Optionally, the partition assembly includes a frame, an electric telescopic rod, and a partition plate. The frame is disposed on the upper end of the support plate, the electric telescopic rod is horizontally disposed on the upper end of the frame, the upper end of the capacity cylinder has a partition groove, and the partition plate is disposed on the telescopic end of the electric telescopic rod and is slidably disposed in the partition groove.

[0013] By adopting the above technical solution, after the grain in the measuring cylinder has completed free fall and inertial clearance, the electric telescopic rod is activated. The telescopic end of the electric telescopic rod moves and drives the separator plate to slide along the frame, so that the separator plate is inserted into the separator groove at the upper end of the measuring cylinder. This accurately separates the standard volume of grain located below the separator plate from the excess grain above, replacing the traditional hand scraper leveling operation. It is not affected by the operator's technique, thereby improving the repeatability and consistency of the bulk density measurement.

[0014] Optionally, the weighing assembly includes a drive motor, a support plate, a pressure sensor, a collection box, a rotating door, and a cylinder. The support plate is disposed on the inner bottom wall of the housing, and two sets are symmetrically arranged. The pressure sensor is disposed on the inner side wall of the two sets of support plates. The collection box is disposed above the pressure sensor. The rotating door is hinged to the lower end of the collection box. The mounting end of the cylinder is rotatably disposed on the upper side wall of the collection box away from the rotating door. The telescopic end of the cylinder is rotatably connected to the rotating door. The drive motor is disposed on the side wall of one set of mounting brackets, and its output end is fixedly connected to the support plate.

[0015] By adopting the above technical solution, the drive motor is started, and the output end of the drive motor rotates, causing the support plate to rotate. The rotation of the support plate causes the capacity cylinder to rotate until the upper end of the capacity cylinder is directly above the collection box. This allows all the excess grain at the top of the capacity cylinder to be poured into the collection box and then dropped into the storage box through the open rotating door. Subsequently, the cylinder is activated, and the extension end of the cylinder moves, causing the rotating door to rotate and close. Then, the separator plate is removed by the electric telescopic rod, allowing all the standard volume of grain in the capacity cylinder to be poured into the collection box. The pressure sensor weighs the grain in the collection box. After weighing, the extension end of the cylinder drives the rotating door to rotate, discharging the grain into the storage box. This achieves direct pouring and weighing of standard volume grain, eliminating the cumbersome steps of removing the capacity cylinder and moving it to the weighing scale in traditional measurements. The entire weighing process is completed inside the box, reducing the influence of environmental airflow and vibration, and improving weighing accuracy and measurement stability.

[0016] Optionally, a fixing plate is vertically arranged on the inner top wall of the box near the lead screw motor. An electric push rod is horizontally arranged on the side wall of the fixing plate, and the telescopic end is arranged through the fixing plate. A reduction motor is vertically arranged on the telescopic end of the electric push rod. A stirring blade is arranged on the output end of the reduction motor. A camera is arranged on the outer peripheral wall of the lower end of the storage cylinder.

[0017] By adopting the above technical solution, the upper end of the measuring cylinder is first lowered to the height of the lower end of the stirring blade by using a lifting motor, transmission components, and electric grippers. Then, the electric push rod is activated, and its extension end moves, driving the reduction motor and stirring blades until the stirring blades are directly above the measuring cylinder. At this point, the reduction motor is activated, and its output end rotates, causing the stirring blades to rotate. Subsequently, the measuring cylinder is slowly raised using the lifting motor, transmission components, and electric grippers, thereby agitating the grain at the upper end of the measuring cylinder and creating a flat upper surface for the grain inside. This results in a grain surface at the upper end of the measuring cylinder that is higher in the middle and lower around the edges, with one side higher than the other. If the grain is low or has an irregular shape, the propagation path and energy distribution of the stress wave during free fall impact will differ, resulting in inconsistent density of grain in different areas of the cylinder and lack of repeatability in batch measurements. However, adjusting the grain at the top of the cylinder to a basically flat state provides a highly uniform initial boundary condition for subsequent free fall impacts, making the mass distribution, height, and surface profile of the grain pile consistent before each impact. This ensures that the inertial compaction effect obtained by the grain in each area of ​​the cylinder after impact is repeatable, improves the consistency and accuracy of bulk density measurement, and reduces measurement errors introduced by random differences in the initial pile shape. The camera can observe and record the flatness of the grain surface at the top of the measuring cylinder in real time, allowing operators to intuitively judge whether the grain surface has met the flatness requirements after the stirring blades are adjusted. This provides a visual initial state confirmation for subsequent free fall impact. In addition, the camera can record images of key steps in each measurement process in real time, so that each bulk density report has traceable and objective verification basis, which has high legal evidence value in trade disputes and arbitration inspections. After the grain surface is leveled, the stirring blades are retracted and the measuring cylinder is raised to the specified height for free fall.

[0018] Optionally, a rotary cylinder is provided on the outer peripheral wall of the upper end of the capacity cylinder, and a sealing plate for sealing the upper end of the capacity cylinder is provided on the output end of the rotary cylinder. A counterweight is provided on the outer peripheral wall of the upper end of the capacity cylinder away from the rotary cylinder for vertically raising and lowering the capacity cylinder.

[0019] By adopting the above technical solution, after the grain at the top of the capacity cylinder is leveled and before free fall, the rotary cylinder is activated. The output end of the rotary cylinder rotates, driving the sealing plate to rotate, thereby sealing the top of the capacity cylinder. This prevents the grain from splashing out of the cylinder opening due to impact, avoiding grain contamination of the equipment inside the box and dust flying. During the lifting and lowering of the capacity cylinder, the counterweight balances the weight on the opposite side with its own weight, keeping the capacity cylinder in a vertical position during movement, thereby ensuring the uniform transmission of impact force and improving the consistency of the stacking effect.

[0020] Optionally, the inner peripheral wall of the guide plate, which is slidably connected to the two sets of guide columns, is provided with a sliding sleeve to reduce guiding resistance.

[0021] By adopting the above technical solution, the sliding sleeve reduces the sliding friction resistance between the guide plate and the guide column, making the initial acceleration of the capacity cylinder during free fall release closer to the pure gravitational acceleration, improving the consistency between the impact energy and the theoretical set value. The low-friction guide also reduces wear, extends the service life of the guide components, and reduces the slight change in falling speed caused by friction fluctuations, further improving the repeatability of the impact clearance effect between multiple measurements.

[0022] Optionally, the lower end of the capacity cylinder is provided with a retaining plate, the outer peripheral wall of the retaining plate is provided with a wedge-shaped surface, and the upper end of the support plate is provided with three sets of retaining blocks at intervals, which are distributed at intervals along the circumference of the capacity cylinder. The inner side of each of the three sets of retaining blocks is provided with a wedge-shaped surface, and when the retaining plate descends, the wedge-shaped surface of the retaining plate slides and abuts against the wedge-shaped surface of the retaining block.

[0023] By adopting the above technical solution, when the capacity cylinder descends, the clamping plate at its lower end falls accordingly. The wedge-shaped surface on the outer peripheral wall of the clamping plate slides and abuts against the wedge-shaped surfaces on the inner sides of the three sets of clamping blocks on the support plate. Under the action of gravity, automatic matching and positioning are achieved, ensuring the uniqueness of the impact contact point. Moreover, the three sets of clamping blocks can provide stable three-point support, reducing swaying and tilting after landing, and making the inertial impact force evenly transmitted to the entire bottom surface of the capacity cylinder. This results in a more uniform and dense rearrangement of grain particles in the radial and axial directions inside the cylinder, improving the accuracy and repeatability of the measurement results.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. Start the electric gripper, which stably holds the upper end of the measuring cylinder. Then start the lifting motor, which drives the electric gripper and measuring cylinder to rise through the transmission component, so that the upper end of the measuring cylinder is pressed against the lower end of the storage cylinder. Then, all the grain is discharged into the measuring cylinder. After all the grain is discharged into the measuring cylinder, the measuring cylinder is lowered to the specified height through the lifting motor, transmission component and electric gripper. After the measuring cylinder is stable, the electric gripper releases the measuring cylinder, allowing the measuring cylinder to fall freely under the sliding cooperation of the guide plate and guide column until it collides with the support plate. The impact of free fall causes all grains to be simultaneously subjected to inertial forces of equal magnitude and parallel to the gravity line at the moment of landing, resulting in indiscriminate shearing and rearrangement on the entire cross-section. The traditional radial gradient stacking structure, characterized by a dense center and loose edges due to shearing, produced by point-by-point hammering, is transformed into an isotropic and stable stacking structure with a uniform compaction mechanism and consistent stacking degree. Furthermore, the impact energy of each impact is entirely determined by the drop height, unaffected by manual manipulation. This results in a stacking state with uniform radial and axial height within a batch and consistent between batches, improving the repeatability, accuracy, and automation of bulk density measurement. The sliding fit of the guide plate and guide column provides rigid constraints for the free fall of the capacity cylinder, ensuring that the capacity cylinder moves along a single vertical axis. This prevents the capacity cylinder from tilting, swaying, or shifting laterally during the fall, thus preventing uneven distribution of impact force at the bottom of the cylinder, radial differences in the inertial force of the grains, and batch-to-batch fluctuations caused by random differences in the fall posture. This provides a rigid mechanical guarantee for the consistency and repeatability of batch-to-batch data. 2. Start the drive motor. The output of the drive motor rotates, causing the support plate to rotate. The rotation of the support plate causes the capacity cylinder to rotate until the upper end of the capacity cylinder is directly above the collection box. This pours all the excess grain from the upper end of the capacity cylinder into the collection box and then through the open rotating door into the storage box. Then, the cylinder is activated. The extension end of the cylinder moves, causing the rotating door to rotate and close. Then, the separator is removed by the electric telescopic rod, allowing all the standard volume of grain in the capacity cylinder to be poured into the collection box. The pressure sensor weighs the grain in the collection box. After weighing, the extension end of the cylinder drives the rotating door to rotate, discharging the grain into the storage box. This achieves direct pouring and weighing of standard volume grain, eliminating the cumbersome steps of removing the capacity cylinder and moving it to the weighing scale in traditional measurements. The entire weighing process is completed inside the box, reducing the influence of environmental airflow and vibration, and improving weighing accuracy and measurement stability. 3. First, the upper end of the measuring cylinder is lowered to the height of the lower end of the stirring blade by lifting the motor, transmission components, and electric grippers. Then, the electric push rod is started. The extension end of the electric push rod moves, driving the reduction motor and stirring blade to move until the stirring blade is directly above the measuring cylinder. At this time, the reduction motor is started. The output end of the reduction motor rotates, driving the stirring blade to rotate. Then, the measuring cylinder is slowly lifted by lifting the motor, transmission components, and electric grippers, thereby agitating the grain at the upper end of the measuring cylinder and forming a flat upper surface of the grain inside the measuring cylinder. If the grain at the upper end of the measuring cylinder is in an irregular shape, such as high in the middle and low around the edges, high on one side and low on the other side, the propagation path and energy distribution of the stress wave during free fall impact will be different, resulting in inconsistent density of grains in different areas of the cylinder and lack of repeatability in batch-to-batch measurements. Adjusting the grain at the upper end of the measuring cylinder to a basically flat state provides a highly uniform initial boundary condition for subsequent free fall impact. This system ensures that the mass distribution, height, and surface profile of the grain pile are consistent before each impact, thereby guaranteeing the repeatability of the inertial compaction effect achieved by the grain in each area of ​​the cylinder after impact. This improves the consistency and accuracy of bulk density measurement and reduces measurement errors introduced by random differences in the initial pile shape. The camera can observe and record the flatness of the grain surface at the top of the cylinder in real time, allowing operators to intuitively judge whether the grain surface has met the flatness requirements after the stirring blades are adjusted. This provides a visual initial state confirmation for subsequent free fall impacts. In addition, the camera can record images of key steps in each measurement process in real time, ensuring that each bulk density report has traceable and objective verification evidence. This provides high legal evidence value in trade disputes and arbitration inspections. After the grain surface is leveled, the stirring blades are retracted, and the cylinder is raised to the designated height for free fall. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a partial structural diagram; Figure 3 yes Figure 2 Partial structural diagram; Figure 4 yes Figure 2 Another perspective illustration; Figure 5 yes Figure 4An enlarged schematic diagram of part A in the middle.

[0027] Reference numerals: 1. Box body; 11. Feed hopper; 12. Storage cylinder; 13. Discharge port; 14. Storage box; 2. Opening and closing assembly; 21. Mounting plate; 22. Screw motor; 23. Baffle; 24. Socket; 3. Bulk density measuring mechanism; 31. Capacity cylinder; 32. Mounting frame; 33. Support plate; 34. Guide plate; 35. Guide column; 36. Lifting motor; 37. Transmission component; 38. Fixing frame; 39. Electric gripper; 4. Dividing assembly Components; 41. Frame; 42. Electric telescopic rod; 43. Divider plate; 44. Divider groove; 5. Weighing assembly; 51. Drive motor; 52. Support plate; 53. Pressure sensor; 54. Collection box; 55. Rotating door; 56. Cylinder; 6. Fixing plate; 61. Electric push rod; 62. Gear motor; 63. Stirring blade; 64. Camera; 7. Rotary cylinder; 71. Sealing plate; 72. Counterweight; 8. Clip plate; 81. Clip block. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0029] This application discloses a grain bulk density measuring instrument employing inertial clearance, referring to... Figure 1 , Figure 2 and Figure 3 A grain bulk density measuring instrument using inertial clearance includes a housing 1. A feeding hopper 11 is fixedly installed on the inner top wall of the housing 1. The lower end of the feeding hopper 11 is connected to a storage cylinder 12. An opening and closing component 2 is installed on the outer peripheral wall of the storage cylinder 12. A material dispensing port 13 is opened on the side wall of the housing 1. A storage box 14 is slidably installed at the material dispensing port 13 and is slidably installed on the inner bottom wall of the housing 1. A bulk density measuring mechanism 3 is installed below the storage cylinder 12.

[0030] Grain enters the storage cylinder 12 through the feeding hopper 11. The opening and closing component 2 controls the opening and closing of the lower end of the storage cylinder 12. After a certain amount of grain has entered the storage cylinder 12, the grain falls into the bulk density measuring mechanism 3. The bulk density measuring mechanism 3 evenly piles the grain and measures its bulk density. After the measurement is completed, the grain falls into the storage box 14. The storage box 14 is taken out from the discharging port 13 to recover the grain. The entire feeding, piling, measuring and discharging process is integrated into the same box 1 and automatically completed. This reduces manual operation links and reduces the action differences caused by manual sample loading, leveling and weighing steps. It improves the repeatability and accuracy of bulk density measurement. At the same time, the closed box 1 structure effectively suppresses dust and improves the working environment.

[0031] Reference Figure 2 and Figure 4The opening and closing component 2 in this embodiment includes a mounting plate 21, a lead screw motor 22, and a baffle 23. The mounting plate 21 is fixedly installed on the outer peripheral wall of the lower end of the storage cylinder 12. The lead screw motor 22 is bolted to the upper end of the mounting plate 21. A socket 24 is provided on the outer peripheral wall of the lower end of the storage cylinder 12. The baffle 23 is threaded to the outer peripheral wall of the lead screw of the lead screw motor 22 and is slidably installed in the upper end of the mounting plate 21 and in the socket 24.

[0032] Start the lead screw motor 22. The lead screw of the lead screw motor 22 rotates and drives the baffle 23 to slide on the mounting plate 21, and causes the baffle 23 to close the opening at the lower end of the storage cylinder 12. Then, a certain amount of grain is poured into the storage cylinder 12 through the feed hopper 11. When it is necessary to discharge all the grain in the storage cylinder 12 into the bulk density measuring mechanism 3, the lead screw motor 22 drives the baffle 23 to open the opening at the lower end of the storage cylinder 12, so that the grain falls into the capacity cylinder 31 evenly with a stable flow rate and speed. This reduces the initial accumulation difference caused by the fluctuating flow rate when manually opening the gate to discharge the grain, and creates highly uniform initial conditions for subsequent uniform accumulation, which helps to improve the repeatability of bulk density measurement data between batches.

[0033] Reference Figure 2 , Figure 3 and Figure 4 To achieve a uniform radial and axial height within a batch and consistent stacking between batches, the bulk density measuring mechanism 3 in this embodiment includes a capacity cylinder 31, a mounting frame 32, a support plate 33, a guide plate 34, a guide column 35, a lifting motor 36, a transmission component 37, a fixing frame 38, an electric gripper 39, a separating component 4, and a weighing component 5. The mounting frame 32 is fixedly installed on the inner bottom wall of the housing 1, and two sets are symmetrically arranged. The two ends of the support plate 33 are rotatably installed on the inner side walls of the two sets of mounting frames 32. The capacity cylinder 31 is lifted and installed on the upper end of the support plate 33, and the guide plate 34 is horizontally fixedly installed on the outer peripheral wall of the capacity cylinder 31. The guide columns 35 are vertically fixedly installed on the upper end of the support plate 33, and two sets are symmetrically arranged. The two sets of guide columns 35 are slidably connected to the two ends of the guide plate 34. The fixing frame 38 is bolted to the inner bottom wall of the box 1. The lifting motor 36 is bolted to the upper end of the fixing frame 38. The electric gripper 39 is slidably installed on the side wall of the fixing frame 38. One end of the transmission component 37 is installed on the output end of the lifting motor 36, and the other end is fixedly connected to the electric gripper 39. The electric gripper 39 is driven to rise and fall by the lifting motor 36. The separating component 4 is installed on the upper end of the support plate 33, and the weighing component 5 is installed below the support plate 33.

[0034] The electric gripper 39 is activated, and it stably clamps the upper end of the capacity cylinder 31. Then, the lifting motor 36 is activated, and the lifting motor 36 drives the electric gripper 39 and the capacity cylinder 31 to rise through the transmission component 37, so that the upper end of the capacity cylinder 31 is pressed against the lower end of the storage cylinder 12. Then, all the grain is discharged into the capacity cylinder 31. After all the grain is discharged into the capacity cylinder 31, the lifting motor 36, the transmission component 37 and the electric gripper 39 lower the capacity cylinder 31 to the specified height. After the capacity cylinder 31 is stable, the electric gripper 39 releases the capacity cylinder 31, so that the capacity cylinder 31 undergoes free fall motion under the sliding cooperation of the guide plate 34 and the guide column 35 until it collides with the support plate 33. The free fall impact causes all grains to be simultaneously subjected to inertial forces of equal magnitude and parallel to the gravity line at the moment of landing, and indiscriminate shearing and rearrangement occur simultaneously on the entire cross-section. The traditional radial gradient stacking structure, which is dense at the center and loose at the edges due to shearing, produced by point-by-point striking with an exhaust hammer, is transformed into an isotropic stable stacking with a uniform compaction mechanism and consistent stacking degree. The energy of each impact is determined entirely by the drop height, unaffected by manual methods. This results in a stacking state with uniform radial and axial height within a batch and consistent between batches, improving the repeatability, accuracy, and automation level of bulk density measurement. The sliding fit between the guide plate 34 and the guide column 35 provides rigid constraint for the free fall of the capacity cylinder 31, ensuring that the capacity cylinder 31 moves along a single vertical axis. This prevents the capacity cylinder 31 from tilting, swaying, or lateral displacement during the fall, thereby preventing uneven distribution of impact force at the bottom of the cylinder, differential components of grain inertial force in the radial direction, and batch-to-batch fluctuations caused by random differences in the fall posture. This provides a rigid mechanical guarantee for the consistency and repeatability of batch-to-batch data. In this embodiment, the lower end of the storage cylinder 12 is provided with a snap-fit ​​groove, and the upper end of the capacity cylinder 31 can be tightly snapped into the snap-fit ​​groove to prevent dust from flying. In this embodiment, the transmission component 37 includes a first pulley, a second pulley, and a belt. The first pulley is fixedly installed on the output end of the lifting motor 36, and the second pulley is rotatably installed on the side wall of the fixed frame 38 and located directly below the first pulley. The belt is sleeved on the outer peripheral wall of the first pulley and the second pulley. The electric gripper 39 is fixedly connected to one side of the belt. The output end of the lifting motor 36 rotates to drive the first pulley to rotate, and the rotation of the first pulley drives the belt and the second pulley to rotate, thereby driving the electric gripper 39 to rise and fall.

[0035] Reference Figure 2 and Figure 4In this embodiment, the partition component 4 includes a frame 41, an electric telescopic rod 42, and a partition plate 43. The frame 41 is fixedly installed on the upper end of the support plate 33. The electric telescopic rod 42 is horizontally bolted to the upper end of the frame 41. A partition groove 44 is provided at the upper end of the capacity cylinder 31. The partition plate 43 is fixedly installed on the telescopic end of the electric telescopic rod 42 and is slidably installed in the partition groove 44.

[0036] When the electric telescopic rod 42 is activated, the telescopic end of the electric telescopic rod 42 moves and drives the separator 43 to slide along the frame 41, so that the separator 43 is inserted into the separator groove 44 at the upper end of the capacity cylinder 31, accurately separating the standard volume of grain below the separator 43 from the excess grain above. This replaces the traditional hand scraper leveling operation and is not affected by the operator's technique, thereby improving the repeatability and consistency of the bulk density measurement.

[0037] Reference Figure 2 , Figure 3 and Figure 5 In order to weigh standard volume grains, the weighing component 5 in this embodiment includes a drive motor 51, a support plate 52, a pressure sensor 53, a collection box 54, a rotating door 55, and a cylinder 56. The support plate 52 is fixedly installed on the inner bottom wall of the box 1, and two sets are symmetrically arranged. The pressure sensor 53 is fixedly installed on the inner side wall of the two sets of support plates 52. The collection box 54 is fixedly installed on the upper end of the pressure sensor 53. The rotating door 55 is hinged to the lower end of the collection box 54. The mounting end of the cylinder 56 is rotatably installed on the upper side wall of the collection box 54 away from the rotating door 55. The telescopic end of the cylinder 56 is rotatably connected to the rotating door 55. The drive motor 51 is bolted to the side wall of one set of mounting brackets 32, and the output end is fixedly connected to the support plate 33.

[0038] The drive motor 51 is started, and its output rotates, causing the support plate 33 to rotate. The rotation of the support plate 33 then rotates the measuring cylinder 31 until its upper end is directly above the collecting box 54. This allows all excess grain from the upper end of the measuring cylinder 31 to be poured into the collecting box 54 and then falls through the open rotating door 55 into the storage box 14. Next, the cylinder 56 is activated, and its telescopic end moves, causing the rotating door 55 to rotate and close. Then, the electric telescopic rod 42 removes the separator 43, allowing the standard volume of grain in the measuring cylinder 31 to be poured into the collecting box 54. The pressure sensor 53 then weighs the grain in the collecting box 54. After weighing, the grain is collected. Afterwards, the telescopic end of cylinder 56 drives the rotating door 55 to rotate, discharging the grain into the storage box 14, thereby realizing the direct pouring and weighing of standard volume grain. This eliminates the cumbersome steps of removing the capacity cylinder 31 and moving it to the weighing instrument in traditional measurement. The entire weighing process is completed inside the box 1, reducing the influence of environmental airflow and vibration, and improving weighing accuracy and measurement stability. In this embodiment, two sets of cylinders 56 are symmetrically arranged on both sides of the collection box 54. The two sets of cylinders 56 are symmetrically arranged on both sides of the collection box 54, and synchronously telescopically drive the rotating door 55 to open and close, so that the force on both sides of the rotating door 55 is balanced, avoiding the skew and jamming caused by unilateral drive and the uneven wear at the hinge, ensuring that the discharge action is smooth and reliable.

[0039] Reference Figure 2 and Figure 4 The different states of the grain at the upper end of the capacity cylinder 31 will affect the consistency and repeatability of the stacking effect. Therefore, in this embodiment, a fixing plate 6 is vertically fixedly installed on the inner top wall of the box 1 near the screw motor 22. An electric push rod 61 is horizontally bolted on the side wall of the fixing plate 6, and the telescopic end is set through the fixing plate 6. A reduction motor 62 is vertically bolted on the telescopic end of the electric push rod 61. A stirring blade 63 is fixedly connected to the output end of the reduction motor 62. A camera 64 is fixedly installed on the outer peripheral wall at the lower end of the storage cylinder 12.

[0040] First, the upper end of the capacity cylinder 31 is lowered to the height of the lower end of the stirring blade 63 by the lifting motor 36, transmission component 37, and electric gripper 39. Then, the electric push rod 61 is activated, and the extension end of the electric push rod 61 moves, driving the reduction motor 62 and stirring blade 63 to move until the stirring blade 63 is directly above the capacity cylinder 31. At this time, the reduction motor 62 is activated, and the output end of the reduction motor 62 rotates, driving the stirring blade 63 to rotate. Then, the capacity cylinder 31 is slowly raised by the lifting motor 36, transmission component 37, and electric gripper 39, thereby agitating the grain at the upper end of the capacity cylinder 31 and forming a flat upper surface of the grain inside the capacity cylinder 31. If the grain at the upper end of the capacity cylinder 31 is of an irregular shape, such as high in the middle and low around the edges, high on one side and low on the other, the propagation path and energy distribution of the stress wave during free fall impact will be different, resulting in inconsistent density of grains in different areas of the cylinder, and lack of repeatability in batch-to-batch measurements. Adjusting the grain at the upper end of the capacity cylinder 31 to a more uniform shape will improve the overall performance. The flat state provides a highly uniform initial boundary condition for subsequent free-fall impact, making the mass distribution, height, and surface profile of the grain pile consistent before each impact. This ensures the repeatability of the inertial compaction effect obtained by the grain in each area of ​​the cylinder after impact, improving the consistency and accuracy of bulk density measurement and reducing measurement errors introduced by random differences in the initial pile shape. The camera 64 can observe and record the flatness of the grain surface at the top of the capacity cylinder 31 in real time, allowing operators to intuitively judge whether the grain surface after adjustment by the stirring blade 63 meets the flatness requirements. This provides a visual initial state confirmation for subsequent free-fall impact. In addition, the camera 64 can record images of key steps in each measurement process in real time, making each bulk density report have traceable and objective verification basis, which has high legal evidence value in trade disputes and arbitration inspections. After the grain surface is leveled, the stirring blade 63 is retracted, and the capacity cylinder 31 is raised to the designated height for free-fall motion.

[0041] Reference Figure 2 and Figure 4 The grain inside the capacity cylinder 31 may splash out from the cylinder opening due to impact. Therefore, in this embodiment, a rotary cylinder 7 is bolted to the outer peripheral wall of the upper end of the capacity cylinder 31, a sealing plate 71 is fixedly installed on the output end of the rotary cylinder 7, and a counterweight 72 is fixedly installed on the outer peripheral wall of the upper end of the capacity cylinder 31 away from the rotary cylinder 7.

[0042] The rotary cylinder 7 is activated, and the output end of the rotary cylinder 7 rotates, which drives the sealing plate 71 to rotate, thereby sealing the upper end of the capacity cylinder 31 to prevent the grain from splashing out of the cylinder opening due to impact, and to avoid grain contamination of the equipment inside the box 1 and dust flying. During the lifting and lowering of the capacity cylinder 31, the counterweight block 72 balances the weight on the opposite side by its own weight, so that the capacity cylinder 31 maintains a vertical posture during movement, thereby ensuring the uniform transmission of impact force and improving the consistency of the stacking effect.

[0043] Reference Figure 2 In this embodiment, the guide plate 34 and the two sets of guide posts 35 are slidably connected and have sliding sleeves fixedly installed on their inner peripheral walls. The sliding sleeves reduce the sliding friction resistance between the guide plate 34 and the guide posts 35, making the initial acceleration of the capacity cylinder 31 during free fall release closer to the acceleration due to pure gravity. This improves the consistency between the impact energy and the theoretical set value. The low-friction guide also reduces wear, extends the service life of the guide components, and reduces the slight change in falling speed caused by friction fluctuations. This further improves the repeatability of the impact gap-clearing effect between multiple measurements. In this embodiment, the sliding sleeve is set as a graphite-inlaid copper sleeve. The self-lubricating properties of graphite form a solid lubricating film between the copper sleeve and the guide post 35 that does not require external grease, reducing the sliding friction coefficient to a low level. This ensures that the axial resistance of the capacity cylinder 31 during lifting and lowering along the guide post 35 and during free fall release is minimized, thereby maximally approximating the theoretical impact energy under pure gravity acceleration and ensuring high consistency of the inertial gap-clearing effect and long-term maintenance-free reliability.

[0044] Reference Figure 5 In this embodiment, the lower end of the capacity cylinder 31 is welded with a retaining plate 8. The outer peripheral wall of the retaining plate 8 is provided with a wedge-shaped surface. Three sets of retaining blocks 81 are fixedly installed at intervals on the upper end of the support plate 33 and are distributed at intervals along the circumference of the capacity cylinder 31. The inner side of each of the three sets of retaining blocks 81 is provided with a wedge-shaped surface. When the retaining plate 8 descends, the wedge-shaped surface of the retaining plate 8 slides and abuts against the wedge-shaped surface of the retaining block 81.

[0045] As the capacity cylinder 31 descends, the retaining plate 8 at its lower end also falls. The wedge-shaped surface on the outer peripheral wall of the retaining plate 8 slides and abuts against the wedge-shaped surface on the inner side of the three sets of retaining blocks 81 on the support plate 33. Under the action of gravity, automatic matching and positioning are achieved, ensuring the uniqueness of the impact contact point. Moreover, the three sets of retaining blocks 81 can provide stable three-point support, reducing the shaking and tilting after landing, and making the inertial impact force evenly transmitted to the bottom surface of the entire capacity cylinder 31. This results in a more uniform and dense rearrangement of grain particles in the radial and axial directions inside the cylinder, improving the accuracy and repeatability of the measurement results.

[0046] The implementation principle of a grain bulk density measuring instrument using inertial clearance according to an embodiment of this application is as follows: The electric gripper 39 is activated, gripping the upper end of the capacity cylinder 31. Then, the lifting motor 36 is activated, which drives the electric gripper 39 and the capacity cylinder 31 to rise through the transmission component 37, so that the upper end of the capacity cylinder 31 is pressed against the lower end of the storage cylinder 12. Then, all the grain is discharged into the capacity cylinder 31. The capacity cylinder 31 is then lowered to the specified height through the lifting motor 36, the transmission component 37, and the electric gripper 39. After the capacity cylinder 31 is stable, the electric gripper 39 releases the capacity cylinder 31, allowing the capacity cylinder 31 to fall freely under the sliding cooperation of the guide plate 34 and the guide column 35 until it collides with the support plate 33. The impact of free fall causes all grains to be simultaneously subjected to an inertial force of equal magnitude and parallel to the line of gravity at the moment of landing, resulting in indiscriminate shearing and rearrangement on the entire cross-section. Start the drive motor 51. The output end of the drive motor 51 rotates, causing the support plate 33 to rotate. The rotation of the support plate 33 causes the capacity cylinder 31 to rotate until the upper end of the capacity cylinder 31 is directly above the collection box 54. Thus, all the excess grain at the upper end of the capacity cylinder 31 is poured into the collection box 54 and falls into the storage box 14 through the unclosed rotating door 55. Then, start the cylinder 56. The telescopic end of the cylinder 56 moves, causing the rotating door 55 to rotate and close. Then, the electric telescopic rod 42 removes the partition plate 43, so that all the standard volume of grain in the capacity cylinder 31 is poured into the collection box 54. The pressure sensor 53 weighs the grain in the collection box 54, thus realizing the direct pouring and weighing of standard volume grain. First, the upper end of the capacity cylinder 31 is lowered to the height of the lower end of the stirring blade 63 by the lifting motor 36, transmission component 37 and electric gripper 39. Then, the electric push rod 61 is started. The extension end of the electric push rod 61 moves, driving the reduction motor 62 and stirring blade 63 to move until the stirring blade 63 is directly above the capacity cylinder 31. At this time, the reduction motor 62 is started. The output end of the reduction motor 62 rotates, driving the stirring blade 63 to rotate. Then, the capacity cylinder 31 is slowly lifted by the lifting motor 36, transmission component 37 and electric gripper 39, thereby agitating the grain at the upper end of the capacity cylinder 31 and forming a flat upper surface of the grain inside the capacity cylinder 31. The camera 64 can observe and record the flatness of the grain surface at the upper end of the capacity cylinder 31 in real time, so that the operator can intuitively judge whether the grain surface after the stirring blade 63 is adjusted meets the flatness requirements.

[0047] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grain bulk density measuring instrument employing inertial clearance, characterized in that: The container includes a box body (1), a feeding hopper (11) is provided on the inner top wall of the box body (1), the lower end of the feeding hopper (11) is connected to a storage cylinder (12), the outer peripheral wall of the storage cylinder (12) is provided with an opening and closing component (2) for opening and closing the lower end of the storage cylinder (12), a material taking port (13) is provided on the side wall of the box body (1), a storage box (14) is slidably provided at the material taking port (13), and the storage box (14) is slidably provided on the inner bottom wall of the box body (1), and a bulk density measuring mechanism (3) for uniformly stacking grain and measuring bulk density is provided below the storage cylinder (12).

2. The grain bulk density measuring instrument using inertial clearance as described in claim 1, characterized in that: The opening and closing assembly (2) includes a mounting plate (21), a lead screw motor (22), and a baffle (23). The mounting plate (21) is disposed on the outer peripheral wall of the lower end of the storage cylinder (12). The lead screw motor (22) is disposed on the upper end of the mounting plate (21). A socket (24) is provided on the outer peripheral wall of the lower end of the storage cylinder (12). The baffle (23) is threaded to the outer peripheral wall of the lead screw of the lead screw motor (22) and is slidably disposed in the upper end of the mounting plate (21) and the socket (24).

3. A grain bulk density measuring instrument employing inertial clearance as described in claim 1, characterized in that: The bulk density measuring mechanism (3) includes a capacity cylinder (31), a mounting frame (32), a support plate (33), a guide plate (34), a guide column (35), a lifting motor (36), a transmission component (37), a fixing frame (38), an electric gripper (39), a separating component (4), and a weighing component (5). The mounting frame (32) is set on the inner bottom wall of the housing (1), and two sets are symmetrically arranged. The two ends of the support plate (33) are rotatably set on the inner side walls of the two sets of mounting frames (32). The capacity cylinder (31) is raised and lowered on the upper end of the support plate (33). The guide plate (34) is horizontally set on the outer peripheral wall of the capacity cylinder (31). The guide column (35) is vertically set on the upper end of the support plate (33), and two sets are symmetrically arranged. The two sets of guide columns (35) and the guide plate (36) are connected to each other. The two ends of 34) are slidably connected. The fixed frame (38) is set on the inner bottom wall of the box (1). The lifting motor (36) is set on the upper end of the fixed frame (38). The electric gripper (39) is slidably set on the side wall of the fixed frame (38) for clamping the upper end of the capacity cylinder (31). One end of the transmission component (37) is set on the output end of the lifting motor (36), and the other end is fixedly connected to the electric gripper (39). The electric gripper (39) is driven to rise and fall by the lifting motor (36). The separating component (4) is set on the upper end of the support plate (33) for separating the grain in the capacity cylinder (31). The weighing component (5) is set below the support plate (33) for weighing the grain in the capacity cylinder (31).

4. A grain bulk density measuring instrument employing inertial clearance as described in claim 3, characterized in that: The partition assembly (4) includes a frame (41), an electric telescopic rod (42), and a partition plate (43). The frame (41) is located at the upper end of the support plate (33). The electric telescopic rod (42) is horizontally located at the upper end of the frame (41). A partition groove (44) is provided at the upper end of the capacity cylinder (31). The partition plate (43) is located on the telescopic end of the electric telescopic rod (42) and is slidably located in the partition groove (44).

5. A grain bulk density measuring instrument employing inertial clearance as described in claim 3, characterized in that: The weighing assembly (5) includes a drive motor (51), a support plate (52), a pressure sensor (53), a collection box (54), a rotating door (55), and a cylinder (56). The support plate (52) is located on the inner bottom wall of the housing (1), and two sets are symmetrically arranged. The pressure sensor (53) is located on the inner side wall of the two sets of support plates (52). The collection box (54) is located at the upper end of the pressure sensor (53). The rotating door (55) is hinged to the lower end of the collection box (54). The mounting end of the cylinder (56) is rotatably located on the upper side wall of the collection box (54) away from the rotating door (55). The telescopic end of the cylinder (56) is rotatably connected to the rotating door (55). The drive motor (51) is located on the side wall of one set of mounting brackets (32), and its output end is fixedly connected to the support plate (33).

6. A grain bulk density measuring instrument employing inertial clearance as described in claim 2, characterized in that: A fixing plate (6) is vertically arranged on the inner top wall of the box (1) near the screw motor (22). An electric push rod (61) is horizontally arranged on the side wall of the fixing plate (6), and the telescopic end is arranged through the fixing plate (6). A reduction motor (62) is vertically arranged on the telescopic end of the electric push rod (61). A stirring blade (63) is arranged on the output end of the reduction motor (62). A camera (64) is arranged on the outer peripheral wall of the lower end of the storage cylinder (12).

7. A grain bulk density measuring instrument employing inertial clearance as described in claim 3, characterized in that: A rotary cylinder (7) is provided on the outer peripheral wall of the upper end of the capacity cylinder (31). A sealing plate (71) for sealing the upper end of the capacity cylinder (31) is provided on the output end of the rotary cylinder (7). A counterweight (72) for vertically raising and lowering the capacity cylinder (31) is provided on the outer peripheral wall of the upper end of the capacity cylinder (31) away from the rotary cylinder (7).

8. A grain bulk density measuring instrument employing inertial clearance as described in claim 3, characterized in that: The inner peripheral wall of the guide plate (34) and the two sets of guide posts (35) are provided with sliding sleeves to reduce guiding resistance.

9. A grain bulk density measuring instrument employing inertial clearance as described in claim 3, characterized in that: The lower end of the capacity cylinder (31) is provided with a retaining plate (8), and the outer peripheral wall of the retaining plate (8) is provided with a wedge-shaped surface. The upper end of the support plate (33) is provided with three sets of retaining blocks (81) spaced apart and distributed along the circumferential direction of the capacity cylinder (31). The inner side of each of the three sets of retaining blocks (81) is provided with a wedge-shaped surface. When the retaining plate (8) descends, the wedge-shaped surface of the retaining plate (8) slides against the wedge-shaped surface of the retaining block (81).

Images