Online yield detection device and detection method for grain harvesters

Abstract

This invention discloses an online yield detection device and method for a grain harvester. The detection device includes multiple storage chambers, a weighing sensor, and a level sensor. All the storage chambers are arranged in a circular array within a measuring chamber, and each measuring chamber has a bottom cover. The bottom cover has a discharge port. The measuring chamber can rotate relative to the bottom cover under the drive of a first motor. It also includes a weighing chamber located below the discharge port, with an openable bottom cover. The weighing sensor is a tension sensor placed between the bottom cover and the weighing chamber. In this invention, the circular array of storage chambers within a rotating measuring chamber allows the discharge port and inlet to be positioned in fixed locations. Grain can be fed into and unloaded from the storage chambers by rotating their positions, resulting in high efficiency in switching storage chambers and minimal modifications to the harvester when integrated.

Description

Technical Field

[0001] This invention relates to the field of grain yield detection technology, and in particular to an online yield detection device and method for grain harvesters. Background Technology

[0002] During grain harvesting, online detection of grain yield is necessary, including grain volume and weight. This allows for real-time monitoring of field yield and avoids the hassle of subsequent statistics. The applicant's prior application, CN 110361078 A, discloses an online yield detection device for grain harvesters based on a weighing-calibrated volumetric system. This device includes a left and right volumetric hopper and a pusher plate. Each hopper has a weighing sensor and a discharge port at its bottom, and each hopper also has a proximity sensor to detect fullness. The pusher plate is driven by a sliding drive mechanism to horizontally push the grain between the two hoppers. During feeding, grain first flows into the left hopper. When the grain height in the left hopper exceeds the top surface by approximately 5 cm, the pusher plate moves to the right, pushing the excess grain into the right hopper. Grain then flows into the right hopper, filling it. Simultaneously, the discharge port of the left hopper opens to discharge grain. When the grain height in the right hopper exceeds its top surface by approximately 5 cm, the pusher plate moves to the left, repeating this process. Furthermore, the machine stops when the hopper is full for the first time, and the mass of grain that can be held in a single hopper is calibrated by the weighing sensor (m1). After calibration, the harvester continues to work, and can stop several times during the harvesting process for calibration.

[0003] The aforementioned prior applications have the following technical problems in actual use:

[0004] (1) Since the left and right hoppers need to take turns feeding and unloading grain, the grain conveying device of the harvester needs to feed grain into the two hoppers in turn. The grain outlets of the two hoppers are located on both sides, which is complex and requires major modifications to the harvester. Therefore, it is difficult to integrate this solution into the existing harvester and the modification cost is high.

[0005] (2) The lateral movement of the push plate and the horizontal movement of the unloading gate are inefficient, require a long response time, and are complex to control in terms of timing. Furthermore, the horizontal movement of the unloading gate is prone to jamming and mechanical failure, resulting in low reliability. In addition, since the gate needs to be opened for unloading, there may be situations where unloading is not possible or is not timely.

[0006] (3) The weighing sensor is installed on the harvester and is in contact with the bottom of the silo but not connected. This increases the vibration of the silo during the harvesting and yield measurement process, which affects the accuracy of the yield measurement data. Summary of the Invention

[0007] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an online yield detection device and detection method for grain harvesters with low structural complexity, high reliability and high operating efficiency.

[0008] Technical solution: To achieve the above objectives, the present invention provides an online yield detection device for a grain harvester, which is used between the outlet of the grain conveying device of the harvester and the grain silo. It includes multiple storage rooms with the same volume, and also includes a weighing sensor and a material level sensor for detecting whether the storage room is full.

[0009] The number of storage rooms is no less than three, and all the storage rooms are arranged in a circular array inside the measuring chamber. The bottom of the measuring chamber has a lower cover; the lower cover has a grain unloading port; the measuring chamber can rotate relative to the lower cover under the drive of a first motor.

[0010] It also includes a weighing hopper located below the unloading port, the weighing hopper having an openable lower cover; the weighing sensor is a tension sensor placed between the lower cover and the weighing hopper. The weighing hopper is suspended below the weighing sensor via a connecting unit.

[0011] Furthermore, the upper end of the measuring chamber has a cover, and the cover has a grain inlet. The grain inlet and the grain outlet are staggered vertically.

[0012] During operation, one storage compartment is located below the grain inlet, and the grain entering from the inlet falls into this compartment. Another storage compartment is located above the grain outlet, and the grain in this compartment flows out through the outlet. The overflowing grain enters a weighing compartment with a closed bottom for weighing. When the weighing compartment is full, any excess overflows into the grain silo. Since there are at least three storage compartments, there is at least one transition position between the grain inlet and the grain outlet. During operation, when the measuring silo rotates, the storage compartment below the grain inlet moves to the transition position, thus filling the transition compartment. As the measuring silo rotates, the storage compartment that was originally in the transition position moves to above the grain outlet, allowing the grain inside to be unloaded. When the measuring silo rotates, the top cover pushes the excess grain above the storage compartment originally located at the grain inlet into the adjacent empty storage compartment, while simultaneously leveling the top of the grain in the storage compartment. This ensures that the grain in the storage compartment is of a fixed volume. The volume of this storage compartment is denoted as V. 测 .

[0013] Preferably, there are four storage rooms, and in the top view, there is a transition position between the two sides of the unloading port and the inlet port. This can prevent excess grain from being scraped into the empty storage room when the measuring silo rotates, thus preventing the grain from leaking directly due to the connection between the empty storage room and the unloading port.

[0014] Furthermore, a scraper and a scraper motor for driving the scraper to rotate are installed at the upper opening of the weighing bin. By driving the scraper to rotate through the scraper motor, the scraper can scrape off excess grain above the weighing bin, causing the excess grain to fall into the grain bin. The upper end of the grain in the weighing bin is flush with the opening of the weighing bin, that is, the volume of the grain is consistent with the volume of the weighing bin.

[0015] The volume of the aforementioned storage compartment is larger than that of the weighing hopper. This ensures that each rotation of the measuring hopper at a set angle guarantees that the falling grain fills the measuring hopper completely and accumulates above its opening. After being leveled by a scraper, the resulting grain volume matches the weighing hopper's volume. This eliminates the possibility of spillage or other losses that could prevent the weighing hopper from being full. The weighing hopper is entirely housed within the grain silo, with its bottom cover normally closed. Grain falling from the unloading port prioritizes filling the weighing hopper; once full, any overflowing grain flows directly into the silo. The grain inside the weighing hopper helps to hold it in place, preventing significant shaking during harvester operation.

[0016] Furthermore, a second motor is installed on the outer wall of the weighing chamber, and a winding wheel is fixed to the output shaft of the second motor. A rope connecting the lower cover of the weighing chamber is wound on the winding wheel. With this structure, when the second motor rotates, the winding wheel can wind and unwind the rope to achieve symmetrical traction movement of the lower cover of the weighing chamber, thereby realizing the opening and closing of the weighing chamber.

[0017] Furthermore, the first motor is mounted on the platform tray, which is fixedly installed relative to the harvester's frame. A drive shaft is also rotatably mounted on the platform tray, and the drive shaft is connected to the measuring chamber. The first motor establishes a transmission relationship with the drive shaft through a reduction gear set. Both the first motor and the platform tray are located above the measuring chamber.

[0018] Furthermore, the measuring chamber is cylindrical, and the level sensor includes a first level sensor and a second level sensor that are radially offset from each other in the measuring chamber. Both the first and second level sensors are mounted on an inclined plate fixed relative to the top cover. By detecting the level status at multiple points, it can be ensured that the measuring chamber is rotated by one step angle only after the current storage compartment is full, thus ensuring accurate measurement of the grain volume.

[0019] Furthermore, the weighing sensor is mounted below the measuring chamber via a V-shaped bracket. The two upper ends of the V-shaped bracket are fixed to the sides of the unloading port, and the lower end of the V-shaped bracket is centered relative to the top-view projection contour of the unloading port.

[0020] The method for online yield detection of a grain harvester is applied to the aforementioned online yield detection device for a grain harvester and implemented by a control unit. In this solution, the control unit is an MCU, which is connected to the level sensor and the weighing sensor, and can drive the first motor, the second motor, and the scraper motor to operate. The method includes:

[0021] Based on the signal generated by the material level sensor, it is determined whether the storage room located below the grain inlet is full. In this solution, both the first material level sensor and the second material level sensor generate trigger electrical signals indicating that the storage room located below the grain inlet is full of grain and the grain has accumulated to the upper side of the opening of the storage room.

[0022] The first motor is controlled to rotate, causing the measuring chamber to rotate by one step angle. After rotating by one step angle, the storage compartment originally located below the grain inlet reaches a transition position, and the storage compartment originally filled with grain in the transition position moves above the unloading port for unloading. Simultaneously, the empty storage compartment originally adjacent to the grain inlet moves below the grain inlet. As the measuring chamber rotates, the top cover pushes excess grain from above the storage compartment originally below the grain inlet into the empty storage compartment that is about to move below the grain inlet.

[0023] Increment the counter by 1 to obtain the current number n of the full storage rooms, and then calculate based on the volume V of the storage rooms. 称 Calculate the total volume V of the harvested grain. 总 V 总 =nV 测 ;

[0024] The weight of the harvested grain is calculated based on the volume of the harvested grain and the mass of the grain per unit volume.

[0025] Furthermore, the method also includes:

[0026] Determine whether the quality calibration conditions are met; if not, keep the weighing chamber cover closed. The quality calibration conditions may include: the harvester's mileage reaching a preset mileage, the harvested grain reaching a preset volume or weight, and situations where the harvested grain size, moisture content, variety, etc., may change due to changes in the plot of land, crop growth conditions (such as large-scale lodging, or crops growing on the shady side of the area).

[0027] When the quality calibration conditions are met, and simultaneously the three conditions are met—the harvester stops moving, no grain falls from the unloading port, and the measuring chamber is in a supersaturated state—the calibration process is executed.

[0028] The calibration process includes:

[0029] Control the operation of the scraper motor so that the scraper flattens the opening of the weighing chamber;

[0030] The weight m of the grain in the weighing bin is calculated by acquiring data generated by the weighing sensor. 称 And in conjunction with the volume V of the weighing chamber 称 Calculate the weight of grain per unit volume.

[0031] Open the bottom cover of the weighing chamber to release the grain. The released grain enters the grain silo, and then close the bottom cover.

[0032] After calibration, subsequent grain weight calculations are based on the calibrated weight per unit volume of grain until the next calibration. When calibration is performed only once during a harvest, the total mass of the harvested grain is obtained.

[0033] The calibration process described above can be repeated multiple times, and the average value is taken to obtain a more accurate weight of grain per unit volume. When multiple mass calibrations are required, after each calibration cycle, the first motor is controlled to rotate the measuring chamber by one step angle, allowing grain from the next storage compartment to fall into the weighing chamber, and the calibration process continues until the set number of cycles is reached. In this case, the final total harvested grain mass is calculated in multiple segments, with the weight calculation result for each segment based on the weight of grain per unit volume calibrated at the beginning of that segment. That is: in, The weight of the grain in the bin is measured during the i-th calibration. Let p be the total volume of grain harvested in the i-th segment; p is the total number of segments.

[0034] Beneficial Effects: The online yield detection device and method for grain harvesters of the present invention have the following beneficial effects:

[0035] (1) Grain volume and grain weight are measured separately, which can effectively reduce the complexity of the structure. Only one tension sensor is needed to effectively calibrate the grain weight. The weighing bin is always vertical due to its own weight, which improves the reliability of the measurement.

[0036] (2) A circular array of storage rooms is set up in the rotary measuring chamber, so that the unloading port and the inlet port can be set in a fixed position. By rotating the position of the storage rooms, the grain can be fed and unloaded in turn. This is convenient for grain feeding and unloading, and the efficiency of switching storage rooms is high. The storage rooms at the unloading port and the inlet port can be switched synchronously, and the grain feeding and unloading can be completed simultaneously. There is no need for complex timing control, the structure is simpler, and the cost is reduced.

[0037] (3) The detection device can be easily integrated into the harvester, and is not affected by the structural differences between the auger type elevator and the scraper type elevator, and does not require major modifications to the existing harvester.

[0038] (4) The passive unloading method is adopted, so the situation of not being able to unload grain or unloading grain in a timely manner will not occur. Attached Figure Description

[0039] Figure 1 A three-dimensional structural diagram of an online yield detection device used in grain harvesters;

[0040] Figure 2 A front view structural diagram of an online yield detection device used in grain harvesters;

[0041] Figure 3 This is a schematic diagram of the layout of the unloading port and the inlet port in a preferred embodiment;

[0042] Figure 4 This is a schematic diagram of the control system.

[0043] In the diagram: 1-Unloading port; 2-Measuring bin; 3-Upper cover; 4-First motor; 5-First gear; 6-Second gear; 7-Drive shaft; 8-Platform support plate; 9-First material level sensor; 10-Second material level sensor; 11-Grain inlet; 12-Lower cover; 13-Weighing sensor; 14-Scraper motor; 15-Weighing bin; 16-Second motor; 17-Lower cover of weighing bin; 18-Rope; 19-Scraper; 20-V-shaped bracket; a-Transition position. Detailed Implementation

[0044] The invention will now be further described with reference to the accompanying drawings.

[0045] like Figure 1-2The illustrated online yield detection device for a grain harvester is used between the outlet of the harvester's grain conveying device and the grain silo. It includes multiple storage compartments of equal volume, a weighing sensor 13 capable of weighing the grain within each compartment, and a level sensor to detect whether the compartment is full. There are at least three storage compartments arranged in a circular array within a measuring compartment 2. The measuring compartment 2 has a lower cover 12 at its bottom and a grain discharge port 1. The measuring compartment 2 can rotate relative to the lower cover 12 under the drive of a first motor 4. Specifically, the first motor 4 is mounted on a platform tray 8, which is fixedly mounted relative to the harvester's frame. A drive shaft 7 is rotatably mounted on the platform tray 8 and connects to the measuring compartment 2. The first motor 4 establishes a transmission relationship with the drive shaft 7 through a reduction gear set. In the illustrated embodiment, the reduction gear set includes a first gear 5 fixed to the output shaft of the first motor 4 and a second gear 6 meshing with the first gear 5 and fixed relative to the drive shaft 7. The first motor 4 and the platform tray 8 are both located above the measuring chamber 2.

[0046] The detection device also includes a weighing chamber 15 located below the unloading port 1, the weighing chamber 15 having an openable lower cover 17; the weighing sensor 13 is a tension sensor placed between the lower cover 12 and the weighing chamber 15. The weighing chamber 15 is suspended below the weighing sensor 13 via a connecting unit.

[0047] The upper end of the measuring chamber 2 has a cover 3, and the cover 3 has a grain inlet 11. The grain inlet 11 is offset vertically from the grain outlet 1.

[0048] During operation, one storage chamber is located below the grain inlet 11, and the grain entering from the grain inlet 11 falls into this storage chamber; another storage chamber is located above the grain outlet 1, and the grain in this storage chamber flows out through the grain outlet 1. The flowing grain can enter the weighing chamber 15, which is closed at the bottom, for weighing. When the weighing chamber is full, the excess overflows into the grain silo. Since there are no fewer than three storage chambers, there is at least one transition position between the grain outlet 1 and the grain inlet 11. In the illustrated embodiment, there are four storage chambers, that is, there are two transition positions between the grain outlet 1 and the grain inlet 11. During operation, when the measuring chamber 2 rotates, the storage chamber below the grain inlet 11 moves to the transition position, so the transition position has a full storage chamber. As the measuring chamber 2 rotates, the storage chamber that was originally in the transition position moves to above the grain outlet 1, so that the grain in it is unloaded. When measuring bin 2 rotates, the top cover 3 pushes the excess grain originally located above the grain inlet 11 into the adjacent empty grain bin, while simultaneously leveling the top of the grain in the grain bin. This ensures that the grain in the grain bin has a fixed volume, and the volume of the grain bin is denoted as V.测 In the illustrated embodiment, the set angle for each rotation of the measuring chamber 2 is 90°, which is called a step angle.

[0049] Preferably, such as Figure 3 As shown, there are four storage rooms, and in the top view, there is a common transition position a between the two sides of the unloading port 1 and the inlet port 11. This can prevent excess grain from being scraped into the empty storage room when the measuring chamber 2 rotates, thus preventing the grain from leaking directly due to the connection between the empty storage room and the unloading port 1.

[0050] The weighing bin 15 is equipped with a scraper 19 and a scraper motor 14 that drives the scraper 19 to rotate. By driving the scraper 19 to rotate through the scraper motor 14, the scraper 19 can scrape off excess grain above the weighing bin 15, causing the excess grain to fall into the grain bin. The upper end of the grain in the weighing bin 15 is flush with the opening of the weighing bin 15, that is, the volume of the grain is consistent with the volume of the weighing bin 15.

[0051] The volume of the aforementioned storage compartment is larger than that of the weighing hopper 15. Thus, each rotation of the measuring hopper 2 at a set angle ensures that the falling grain fills the measuring hopper 2 completely and accumulates above its opening. After being leveled by the scraper 19, the grain volume matches that of the weighing hopper 15. This eliminates the possibility of splashing losses from falling grain, preventing the weighing hopper 15 from being filled. The weighing hopper 15 can be entirely placed inside the grain silo, with its lower cover 17 normally closed. Grain falling from the unloading port 1 prioritizes filling the weighing hopper 15. Once the weighing hopper 15 is full, subsequent grain overflows and enters the grain silo directly. The grain inside the weighing hopper 15 can hold it down, preventing significant shaking during harvester operation.

[0052] The above structure offers several advantages. First, separating grain volume and weight measurements effectively reduces structural complexity, requiring only a single tension sensor for effective weight calibration and improving measurement reliability. Second, the circular array of storage chambers within the rotary measuring chamber 2 allows the unloading port 1 and the inlet port 11 to be positioned in fixed locations. Grain can be fed and unloaded in rotation through the rotating positions of these storage chambers, facilitating easy integration into the harvester. This design is unaffected by structural differences between auger and scraper elevators, offers high efficiency in switching storage chambers, simplifies the structure, and reduces costs. Third, during the harvesting process, both the volume and weight of the harvested grain can be obtained simultaneously.

[0053] A second motor 16 is installed on the outer wall of the weighing chamber 15. A winding wheel is fixed on the output shaft of the second motor 16, and a rope 18 connecting the weighing chamber lower cover 17 is wound on the winding wheel. With this structure, when the second motor 16 rotates, the winding wheel can wind and unwind the rope 18 to achieve symmetrical traction movement of the weighing chamber lower cover 17, thereby opening and closing the weighing chamber 15.

[0054] The measuring chamber 2 is cylindrical. The material level sensors include a first material level sensor 9 and a second material level sensor 10, which are radially offset from each other in the measuring chamber 2. Both the first material level sensor 9 and the second material level sensor 10 are mounted on an inclined plate fixed relative to the upper cover 3. By detecting the material level at multiple points, it can be ensured that the measuring chamber 2 is rotated by a step angle only after the current storage compartment is full, thus ensuring accurate measurement of the grain volume.

[0055] The weighing sensor 13 is mounted below the measuring chamber 2 via a V-shaped bracket 20. The two upper ends of the V-shaped bracket 20 are fixed to the side of the unloading port 1, and the lower end of the V-shaped bracket 20 is centered relative to the top-view projection outline of the unloading port 1.

[0056] The online yield detection method for grain harvesters is applied to the aforementioned online yield detection device for grain harvesters and implemented by a control unit. In this embodiment, the control unit is an MCU, such as... Figure 4 As shown, the MCU connects to the level sensor and the weighing sensor 13, and can drive the first motor 4, the second motor 16, and the scraper motor 14. In addition, the MCU is also connected to a communication module for external communication. The method includes the following steps S101-S104:

[0057] Step S101: Based on the signal generated by the material level sensor, determine whether the storage room located below the grain inlet 11 is full. In this embodiment, both the first material level sensor 9 and the second material level sensor 10 generate trigger electrical signals indicating that the storage room located below the grain inlet 11 is full of grain and the grain has accumulated to the upper side of the opening of the storage room.

[0058] In step S102, the first motor 4 is controlled to rotate, causing the measuring chamber 2 to rotate by a step angle. After rotating by a step angle, the storage room originally located below the grain inlet 11 reaches a transition position, and the storage room originally filled with grain in the transition position moves above the unloading port 1 for unloading. The empty storage room originally adjacent to the grain inlet 11 moves below the grain inlet 11. As the measuring chamber 2 rotates, the upper cover 3 pushes the excess grain above the storage room originally located below the grain inlet 11 into the empty storage room that is about to move below the grain inlet 11.

[0059] Step S103: Increment the counter by 1 to obtain the number n of the currently full storage rooms, and calculate based on the volume V of the storage rooms. 测 Calculate the total volume V of the harvested grain. 总 V 总 =nV 测 ;

[0060] Step S104: Calculate the weight of the harvested grain based on the volume of the harvested grain and the mass of the grain per unit volume.

[0061] Preferably, the method further includes:

[0062] Determine whether the quality calibration conditions are met; if not, close the weighing chamber cover 17 so that the weighing chamber 15 is filled with grain and is in an oversaturated state; when the quality calibration conditions are met, and the harvester stops moving, no grain falls from the unloading port 1, and the measuring chamber 2 is in an oversaturated state, execute the calibration process.

[0063] Quality calibration conditions may include: the harvester's mileage reaching the preset mileage, the harvested grain reaching the preset volume or weight, and situations such as changing the harvesting plot, changes in crop growth conditions (such as large-scale lodging, or crops growing on the shady side of the area), which may cause changes in the size, moisture content, variety, and other factors of the harvested grain.

[0064] The above calibration process includes the following steps S201-S203:

[0065] Step S201: Control the scraper motor 14 to operate so that the scraper 19 scrapes the opening of the weighing chamber 15 flat.

[0066] Step S202: Acquire the data generated by the weighing sensor 13 and calculate the weight m of the grain in the weighing bin 15. 称 And in conjunction with the volume V of the weighing chamber 15 称 Calculate the weight of grain per unit volume.

[0067] Step S203: Open the weighing chamber lower cover 17 to release the grain. The released grain enters the grain silo. After the grain is completely released, close the lower cover.

[0068] After calibration, subsequent grain weight calculations are based on the calibrated weight per unit volume of grain until the next calibration. When calibration is performed only once during a harvest, the total mass of the harvested grain is obtained.

[0069] During the calibration process, steps S201-S203 can be repeated multiple times, and the average value is taken to obtain a more accurate weight of grain per unit volume. When multiple mass calibrations are required, after each calibration cycle, the first motor 4 is controlled to rotate the measuring chamber 2 by one step angle, so that the grain in the next storage chamber falls into the weighing chamber 15, and the calibration process continues until the set number of times is reached. In this case, the final total mass of harvested grain is calculated in multiple segments, and the weight calculation result of each segment is based on the weight of grain per unit volume calibrated at the beginning of that segment. That is: in The weight of the grain in bin 15 is measured during the i-th calibration. Let p be the total volume of grain harvested in the i-th segment; p is the total number of segments.

[0070] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An online yield detection device for a grain harvester, comprising multiple storage compartments, a weighing sensor (13), and a level sensor for detecting whether the storage compartments are full; characterized in that: All the storage rooms are arranged in a circular array inside the measuring chamber (2), and the bottom of the measuring chamber (2) has a lower cover (12); the lower cover (12) has a grain unloading port (1); the measuring chamber (2) can rotate relative to the lower cover (12) under the driving action of the first motor (4); It also includes a weighing bin (15) located below the unloading port (1), the weighing bin (15) having an openable weighing bin cover (17); the weighing sensor (13) is a tension sensor placed between the cover (12) and the weighing bin (15); The weighing chamber (15) is equipped with a scraper (19) and a scraper motor (14) that drives the scraper (19) to rotate. The upper end of the measuring chamber (2) has a cover (3), and the cover (3) has a grain inlet (11); there are four storage chambers, and in the top view, there is a transition position between the unloading port (1) and the grain inlet (11) on both sides; The weighing bin (15) is suspended below the weighing sensor (13) via a connecting unit; the volume of the storage room exceeds the volume of the weighing bin (15); the weighing bin (15) is placed inside the grain silo, and the lower cover (17) of the weighing bin is normally closed. Grains falling from the unloading port (1) first fill the weighing bin (15), and after the weighing bin (15) is filled, the subsequent grains that fall overflow directly into the grain silo.

2. The online yield detection device for a grain harvester according to claim 1, characterized in that, A second motor (16) is installed on the outer wall of the weighing chamber (15). A winding wheel is fixed on the output shaft of the second motor (16), and a rope (18) connecting the lower cover (17) of the weighing chamber is wound on the winding wheel.

3. The online yield detection device for a grain harvester according to claim 1, characterized in that, The first motor (4) is mounted on the platform tray (8), and a drive shaft (7) is also rotatably mounted on the platform tray (8). The drive shaft (7) is connected to the measuring chamber (2). The first motor (4) establishes a transmission relationship with the drive shaft (7) through a reduction gear set.

4. The online yield detection device for a grain harvester according to claim 1, characterized in that, The measuring chamber (2) is cylindrical, and the material level sensor includes a first material level sensor (9) and a second material level sensor (10) that are radially offset from each other in the measuring chamber (2).

5. The online yield detection device for a grain harvester according to claim 1, characterized in that, The weighing sensor (13) is mounted below the measuring chamber (2) via a V-shaped bracket (20).

6. A method for online yield detection of a grain harvester, which applies the online yield detection device for a grain harvester as described in claim 1, characterized in that, The method includes: Based on the signal generated by the material level sensor, it is determined whether the storage room located below the grain inlet (11) is full; Control the first motor (4) to rotate so that the measuring chamber (2) rotates by a step angle; Increment the counter by 1 to obtain the current number n of the full storage rooms, and then calculate based on the volume of the storage rooms. Calculate the total volume of the harvested grain. ,Right now =n ; The weight of the harvested grain is calculated based on the volume of the harvested grain and the mass of the grain per unit volume.

7. The online yield detection method for a grain harvester according to claim 6, characterized in that, The method further includes: Determine whether the quality calibration conditions are met; when the quality calibration conditions are met, and simultaneously the three conditions are met—the harvester stops moving, no grain falls from the unloading port (1), and the measuring chamber (2) is in an oversaturated state—the calibration process is executed. The calibration process includes: Control the operation of the scraper motor (14) so ​​that the scraper (19) scrapes the opening of the weighing bin (15) flat; The weight of the grain in the weighing bin (15) is calculated by acquiring data generated by the weighing sensor (13). and in combination with the volume of the weighing chamber (15) Calculate the weight of grain per unit volume; Open the weighing chamber cover (17) to release the grain, and close the cover after the grain has been completely released; When multiple quality calibrations are required, each time the calibration process is completed, the first motor (4) is controlled to rotate the measuring chamber (2) by one step angle so that the grain in the next storage chamber falls into the weighing chamber (15), and the calibration process continues until the set number of times is reached.

Images