Grain yield monitoring device and method having moisture content measurement function

Abstract

A grain yield monitoring device having a moisture content measurement function. The grain yield monitoring device comprises: a processor, a grain storage device, a metering device and a counterweight device. The method comprises: when a balance arm (9) is in equilibrium, obtaining a calibrated grain mass on the basis of the mass of a counterweight block (6), and obtaining a grain volume in a metering device on the basis of trigger positions of a photoelectric sensor array (21); and on the basis of a grain flow signal, obtaining the measured mass of grains flowing through a grain storage device within a mass calibration time period, calibrating, on the basis of an error between the calibrated grain mass and the measured grain mass, a grain mass obtained by a flow sensor (12), and thereby obtaining a total grain yield, and on the basis of the grain volume, obtaining grain moisture content. Simultaneously measuring grain moisture content and calibrating grain yield reduces the impact of harvester jolting and slope gradient on the measurement precision. Further disclosed is a grain yield monitoring method having a moisture content measurement function.

Description

Grain harvest monitoring device and method with moisture content measurement function

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This invention claims priority to Chinese patent application No. 202410117933.2 filed with the State Intellectual Property Office of China on January 26, 2024, entitled “A grain harvest monitoring device and method with moisture content measurement function”, the entire contents of which are incorporated by reference into this invention and constitute a part of this invention for all purposes. Technical Field

[0003] The present invention relates to the technical field of intelligent agricultural machinery, and in particular to a grain harvest monitoring device and method with a moisture content measurement function. Background Art

[0004] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0005] The harvester's yield monitoring system is a crucial component of precision agriculture, and the yield map generated by the system is a crucial component of the operation prescription map. Currently, grain harvester yield measurement technologies primarily use impulse, weighing, volumetric, capacitive, and photoelectric methods to monitor the total amount of grain entering the warehouse. These methods are all subject to calibration errors, errors in grain moisture content and density, sensor errors, and machine vibration errors.

[0006] Currently, the most widely used yield measurement method is the weighing sensor yield measurement method, but this method has many defects. First, when the plots and crop types and varieties are changed, multiple stops and calibrations are required, which makes actual operation difficult; second, the bumps and vibrations of the harvester during operation have a great impact on the measurement values ​​of the weighing sensor, seriously affecting the measurement accuracy; third, it cannot be calibrated independently when the grain density changes.

[0007] Summary of the Invention

[0008] In order to solve the above problems, the present invention proposes a grain harvest monitoring device and method with moisture content measurement function, which measures the grain moisture content while calibrating the grain harvest, reduces the impact of harvester bumps and slopes on measurement accuracy, and has the functions of self-calibration of grain flow measurement values ​​and moisture content measurement.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a grain harvest monitoring device with a moisture content measurement function, comprising: a processor, a grain storage device, a metering device disposed below the grain storage device, and a counterweight device connected to the metering device;

[0011] The grain storage device is provided with a flow sensor for detecting the grain flow;

[0012] The metering device is provided with a photoelectric sensor array;

[0013] The counterweight device includes a counterweight block and a balance arm, with a counterweight block and a metering device respectively provided on both sides of the balance arm;

[0014] The processor is configured to obtain the calibrated mass of the grain based on the mass of the counterweight block when the balancing arm is in a balanced state, and obtain the volume of the grain in the metering device based on the trigger position of the photoelectric sensor array; obtain the measured mass of the grain flowing through the grain storage device during the mass calibration time period based on the grain flow signal, calibrate the grain mass obtained by the flow sensor based on the error between the calibrated mass of the grain and the measured mass of the grain, thereby obtaining the total grain harvest, and obtain the moisture content of the grain based on the grain volume; wherein the mass calibration time period is the time period from the start of calibration to the time when the balancing arm is in a balanced state.

[0015] As an optional embodiment, the grain storage device includes a grain storage barrel provided with a flow sensor and a grain storage barrel flip device for opening and closing the grain storage barrel; the grain storage barrel flip device includes a grain storage barrel flip motor, a grain storage barrel flip and a grain storage barrel push-pull electromagnet, the rotating shaft of the grain storage barrel flip is installed on the outer wall of the grain storage barrel and connected to the grain storage barrel flip motor, the grain storage barrel push-pull electromagnet is installed at the bottom of the grain storage barrel and is arranged at 90° to the rotating shaft of the grain storage barrel flip, for supporting and fixing the grain storage barrel flip.

[0016] As an optional embodiment, the metering device includes a metering cylinder and a metering cylinder flap device for opening and closing the metering cylinder; the metering cylinder is mounted on a balance arm, and the photoelectric sensor array is mounted at 90 degrees on the bell mouth wall of the metering cylinder;

[0017] The metering cylinder flip device includes a metering cylinder flip, a metering cylinder push-pull electromagnet and a metering cylinder flip motor. The rotating shaft of the metering cylinder flip is installed on the outer wall of the metering cylinder and is connected to the metering cylinder flip motor. The metering cylinder push-pull electromagnet is installed at the bottom of the metering cylinder and is arranged at 90° to the rotating shaft of the metering cylinder flip, which is used to support and fix the metering cylinder flip.

[0018] As an optional embodiment, when calibration begins, the metering cylinder flap motor drives the metering cylinder flap to rotate to close the bottom of the metering cylinder, and the push rod of the metering cylinder push-pull electromagnet extends to fix the metering cylinder flap;

[0019] When the photoelectric sensor array has a trigger signal, the grain storage drum flap motor drives the grain storage drum flap to rotate, so as to gradually reduce the opening of the bottom of the grain storage drum;

[0020] When the balance arm is in a balanced state, the grain storage barrel flip motor drives the grain storage barrel flip to rotate to close the bottom of the grain storage barrel, and the grain storage barrel push-pull electromagnet fixes the grain storage barrel flip;

[0021] After the calibration is completed, the push rod of the push-pull electromagnet of the metering cylinder is retracted, and the metering cylinder flap motor drives the metering cylinder flap to rotate to open the bottom of the metering cylinder;

[0022] When the grain in the metering cylinder is emptied, the push rod of the grain storage cylinder push-pull electromagnet is retracted, and the grain storage cylinder flap motor drives the grain storage cylinder flap to rotate to open the grain storage cylinder.

[0023] As an optional embodiment, the counterweight device further includes a support mechanism, which includes a support base, a support seat, a positioning plate, a support seat bearing, a force sensor, a damper, a support block and a contact switch;

[0024] The support seat is arranged on the support base, and the balance arm is connected to the support seat through the support seat bearing, and performs vertical movement with the support seat as the fulcrum;

[0025] Two dampers and two force sensors are provided between the support base and the balance arm;

[0026] The positioning plate is installed on the grain box of the harvester and is set opposite to the counterweight block. The positioning plate is equipped with a support block and a contact switch.

[0027] A support block and a contact switch are provided on a side of the support base opposite to the counterweight block.

[0028] As an optional embodiment, the balancing arm is in a balanced state when the values ​​of the two force sensors are equal or within a set threshold range, and the counterweight triggers the contact switch on the positioning plate.

[0029] After calibration is completed and the grain in the metering cylinder is emptied, the counterweight falls onto the support block of the support base and triggers the contact switch at the same time.

[0030] As an alternative embodiment, the measured mass M′ of grain flowing through the grain storage device at the sampling time interval Δt is: M′=gΔt 2 ·ρS; The number of sampling times of the flow sensor within the mass calibration period ΔT is n′, and the average grain mass is thus for: M′ i represents the grain mass measured by the flow sensor at the i-th sampling time;

[0031] By judgment The error ΔM from the grain calibration mass and the set value M ERThe size of the grain mass obtained by the flow sensor is used to determine whether the grain mass obtained by the flow sensor is calibrated, and the total grain harvest M is obtained. 总 for:

[0032] Where: n1 is the number of times the harvest process is not calibrated; n2 is the total number of calibrations during the harvest process; S is the area of ​​grain flowing through the grain storage device; ρ is the grain density; M 1i represents the i-th uncalibrated grain harvest; M 2i represents the grain harvest at the i-th calibration.

[0033] As an optional embodiment, when ΔM is less than or equal to the set value M ER If no calibration is performed, then if the total number of sampling times of the flow sensor during the mass calibration period ΔT and the interval period T before calibration is n ΔT+T1 , then the grain harvest M1 is: S i represents the area of ​​grain flowing through the grain storage cylinder detected for the i-th time;

[0034] When ΔM is greater than the set value, calibration is performed. The grain harvest within the mass calibration period ΔT uses the grain calibration mass m to obtain the calibration coefficient k. ER for If the sampling times of the flow sensor in the interval time period T before calibration is n T The flow sensor is calibrated to measure M' T , The grain harvest M2 in the ΔT+T time period is: M2=m+M′ T .

[0035] As an optional embodiment, the moisture content of the grain obtained based on the grain volume is:

[0036] Where n w is the total number of measurements of grain moisture content; W i is the grain moisture content measured for the i-th time; ρ is the grain density under the ideal moisture content condition of the working plot; V is the grain volume under the ideal moisture content condition of the working plot; V′ is the grain volume in the measuring cylinder under equilibrium state; m is the calibrated mass of the measuring cylinder under ideal moisture content condition.

[0037] In a second aspect, the present invention provides a method for monitoring grain harvest with a moisture content measurement function, using the grain harvest monitoring device with a moisture content measurement function described in the first aspect, comprising:

[0038] When the balancing arm is in a balanced state, the calibrated mass of the grain is obtained according to the mass of the counterweight;

[0039] The grain mass flowing through the grain storage device during the mass calibration period is obtained based on the grain flow signal from the flow sensor, and the grain mass obtained by the flow sensor is calibrated based on the error between the calibrated grain mass and the measured grain mass, thereby obtaining the total grain harvest; wherein the mass calibration period is the period from the start of calibration to the time when the balance arm is in a balanced state;

[0040] When the balancing arm is in a balanced state, the volume of the grain in the metering device is obtained according to the trigger position of the photoelectric sensor array, and the moisture content of the grain is obtained according to the volume of the grain.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention proposes a grain yield monitoring device and method with moisture content measurement capabilities. The device measures grain flow using a grain flow sensor, calibrates the sensor's measurement value at regular intervals, and simultaneously measures grain moisture content while calibrating the grain yield, enabling detection of both grain moisture content and yield information. The monitoring device provided by the present invention features a simple structure and principle, self-calibration, and independence from the type of crop being harvested. It reduces the impact of harvester vibrations and slopes on measurement accuracy, is less susceptible to environmental factors, offers high measurement accuracy, and enables real-time dynamic monitoring. It also features self-calibration of measurement values ​​and moisture content measurement.

[0043] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0045] FIG1 is a front view of a grain harvest monitoring device with a moisture content measurement function provided by Example 1 of the present invention;

[0046] FIG2 is an axonometric view of a grain harvest monitoring device with a moisture content measurement function provided by Example 1 of the present invention;

[0047] FIG3 is a partial cross-sectional view of a grain harvest monitoring device with a moisture content measurement function provided by Example 1 of the present invention;

[0048] Among them, 1. Support base; 2. Support seat; 3. Damper; 4. Force sensor; 5. Support block; 6. Counterweight block; 7. Positioning plate; 8. Contact switch; 9. Balance arm; 10. Support seat bearing; 11. Measuring cylinder; 12. Flow sensor; 13. Grain storage cylinder flap; 14. Measuring cylinder flap; 15. Grain storage cylinder; 16. Grain storage cylinder push-pull electromagnet; 17. Grain storage cylinder flap motor; 18. Stirring motor; 19. Measuring cylinder flap motor; 20. Measuring cylinder push-pull electromagnet; 21. Photoelectric sensor array; 22. Agitator. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0050] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "comprise" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0053] Example 1

[0054] As shown in FIG1-2, this embodiment provides a grain harvest monitoring device with a moisture content measurement function, comprising: a processor, a grain storage device, a metering device provided below the grain storage device, and a counterweight device connected to the metering device;

[0055] The grain storage device is provided with a flow sensor for detecting the grain flow;

[0056] The metering device is provided with a photoelectric sensor array;

[0057] The counterweight device includes a counterweight block and a balance arm, with a counterweight block and a metering device respectively provided on both sides of the balance arm;

[0058] The processor is configured to obtain the calibrated mass of the grain based on the mass of the counterweight block when the balancing arm is in a balanced state, and obtain the volume of the grain in the metering device based on the trigger position of the photoelectric sensor array; obtain the measured mass of the grain flowing through the grain storage device during the mass calibration time period based on the grain flow signal, calibrate the grain mass obtained by the flow sensor based on the error between the calibrated mass of the grain and the measured mass of the grain, thereby obtaining the total grain harvest, and obtain the moisture content of the grain based on the grain volume; wherein the mass calibration time period is the time period from the start of calibration to the time when the balancing arm is in a balanced state.

[0059] In this embodiment, the grain storage device is installed on a grain harvester and includes a grain storage cylinder 15, a grain storage cylinder flap device and a flow sensor 12;

[0060] The grain storage cylinder 15 is fixed on the granary, and the grain transported to the granary first enters the grain storage cylinder 15; the flow sensor 12 is installed on the side wall of the grain storage cylinder 15. The flow sensor adopts microwave detection method to detect the flow rate of grain falling from the grain storage cylinder 15, and then calculate the mass of the falling grain.

[0061] The grain storage barrel flip device is fixed at the bottom of the grain storage barrel 15 and is used to complete the opening and closing actions of the grain storage barrel 15; the grain storage barrel flip device includes a grain storage barrel flip motor 17, a grain storage barrel flip 13 and a grain storage barrel push-pull electromagnet 16. The rotating shaft of the grain storage barrel flip 13 is installed on two bearings on the outer wall of the grain storage barrel 15 and is connected to the grain storage barrel flip motor 17. The grain storage barrel push-pull electromagnet 16 serves as a fixing device for the grain storage barrel flip 13 and is installed at the bottom of the grain storage barrel 15. It is arranged at 90° to the rotating shaft of the grain storage barrel flip 13. After the push rod of the grain storage barrel push-pull electromagnet 16 is extended, it supports and fixes the grain storage barrel flip 13.

[0062] In this embodiment, the metering device includes a metering drum 11, a metering drum flap device and a stirring device;

[0063] The metering cylinder 11 is mounted on the balance arm 9;

[0064] The metering drum flip device has the same structure as the grain storage drum flip device, and is used for the opening and closing actions of the metering drum 11, including a metering drum flip 14, a metering drum push-pull electromagnet 20 and a metering drum flip motor 19; the rotating shaft of the metering drum flip 14 is installed on two bearings on the outer wall of the metering drum 11 and is connected to the metering drum flip motor 19. The metering drum push-pull electromagnet 20 serves as a fixing device for the metering drum flip 14 and is installed at the bottom of the metering drum 11, and is arranged at 90° to the rotating shaft of the metering drum flip 14. After the push rod of the metering drum push-pull electromagnet 20 is extended, it supports and fixes the metering drum flip 14.

[0065] In this embodiment, as shown in Figure 3, the stirring device includes a stirring motor 18 and an agitator 22. The stirring motor 18 is fixed on the outer wall of the metering cylinder 11, and the agitator 22 is installed on two bearings on the outer wall of the metering cylinder 11 and is connected to the stirring motor 18. The stirring motor 18 drives the agitator 22 to rotate, so that the grains in the metering cylinder 11 are distributed more compactly and evenly, and the top of the grain pile is smoother.

[0066] In this embodiment, two groups of photoelectric sensor arrays 21 are provided and are installed on the bell mouth wall of the metering cylinder 11 at a 90° angle.

[0067] In this embodiment, the counterweight device further includes a support mechanism; the support mechanism is mounted on the grain tank of the harvester and includes a support base 1, a support seat 2, a positioning plate 7, a support seat bearing 10, a force sensor 4, a damper 3, a support block 5 and a contact switch 8;

[0068] The support seat 2 is arranged on the support base 1, and the balance arm 9 is connected to the support base 2 through the support seat bearing 10. The two dampers 3 and the two force sensors 4 are connected to the support base 1 and the balance arm 9 at both ends. The damper 3 is used to reduce or prevent the up and down swing of the balance arm 9 caused by the bumps of the harvester. The force sensor 4 is used to measure the tension of the balance arm 9 on both sides of the support seat 2; the positioning plate 7 is installed on the harvester grain tank and is arranged opposite to the counterweight 6; two contact switches 8 are installed on the positioning plate 7 and the support base 1; one of the two support blocks 5 is installed on the support base 1, and the other is installed on the positioning plate 7 to buffer the impact force of the up and down swing of the counterweight 6;

[0069] The counterweight 6 and the metering device are installed on both sides of the balance arm 9 and are connected to the support base 2 through the support base bearing 10. They move vertically up and down with the support base 2 as the fulcrum.

[0070] In this embodiment, the above device can be used to measure the grain moisture content in order to measure the grain harvest.

[0071] Specifically, grain yield is measured using a flow sensor and a metering cylinder calibration method. Grain lifted by the harvester first falls into the grain storage cylinder 15 and then into the grain bin through the metering cylinder 11. The grain's falling motion is considered free fall, with both the grain storage cylinder flap 13 and the metering cylinder flap 14 open.

[0072] The falling grain flow rate is measured by the flow sensor 12, and the grain area S flowing through the grain storage cylinder 15 is obtained by microwave detection. Within the same sampling time interval Δt, the grain falling distance is Δh = gΔt 2 , then the volume of grain is V = gΔt 2S, based on the grain density ρ of the working plot under the ideal moisture content measured before the operation, the grain mass M′ flowing through the grain storage cylinder 15 under the sampling time interval Δt is obtained: M′=gΔt 2 ·ρS.

[0073] The metering cylinder 11 calibrates the measured value of the flow sensor 12 at intervals T. First, the metering cylinder flap motor 19 rotates the metering cylinder flap 14, closing the bottom of the metering cylinder 11. The push rod of the metering cylinder push-pull electromagnet 20 extends to fix the metering cylinder flap 14, and the grain falls into and is temporarily stored in the metering cylinder 11.

[0074] When the photoelectric sensor array 21 at the bell mouth of the metering cylinder receives a trigger signal, the grain storage cylinder flap motor 17 rotates the grain storage cylinder flap 13, gradually reducing the opening of the bottom of the grain storage cylinder 15, so that the grain falling into the metering cylinder 11 slowly increases;

[0075] When the values ​​of the two force sensors 4 on the balance arm 9 are equal or within the set threshold range, and the counterweight block 6 triggers the contact switch 8 on the positioning plate 7, the balance arm 9 reaches a balanced state. At this time, the grain storage barrel flip motor 17 is controlled to rotate the grain storage barrel flip 13, closing the bottom of the grain storage barrel 15, and the grain storage barrel push-pull electromagnet 16 fixes the grain storage barrel flip 13. At this time, the grain is temporarily stored in the grain storage barrel 15.

[0076] When the balance arm is in a balanced state, the mass of the counterweight 6 is equal to the sum of the mass of the grain in the metering cylinder 11 and the mass of the metering cylinder 11 and its accessories, that is, m 配重 =m 筒 +m, where m is the calibrated mass of grain in the measuring cylinder under ideal moisture content conditions, m 筒 It is the mass of the measuring cylinder and its accessories.

[0077] After both ends of the balance arm 9 are balanced, the stirring motor 18 in the metering cylinder rotates for a period of time. When the signal of the photoelectric sensor array is stable, the push rod of the metering cylinder push-pull electromagnet 20 is retracted, and the metering cylinder flip motor 19 opens the bottom of the metering cylinder, and the grain in the metering cylinder falls into the granary; after the grain in the metering cylinder is emptied, the counterweight block 6 falls onto the support block 5, and at the same time triggers the contact switch 8 on the support base 1. The trigger signal causes the controller to control the push rod of the grain storage cylinder push-pull electromagnet 16 to be retracted, and the grain storage cylinder flip motor 17 opens the bottom of the grain storage cylinder 15. At this time, the metering cylinder completes a calibration process.

[0078] Record the number of sampling times of the flow sensor during the mass calibration period ΔT from the closing of the bottom of the metering cylinder 11 to the closing of the bottom of the grain storage cylinder 15 as n', and thus obtain the average grain harvest amount M′ i represents the grain mass measured by the flow sensor at the i-th sampling time.

[0079] when The error ΔM from m is less than or equal to the set value M ER When The flow sensor measurement value within the mass calibration time period ΔT and the pre-calibration interval T is not calibrated; if the total number of sampling times of the flow sensor within the ΔT+T time period is n ΔT+T1 , then the grain harvest M1 is: S i Represents the area of ​​grain flowing through the grain storage barrel detected for the i-th time.

[0080] when The error ΔM from m is greater than the set value M ER When The grain harvest within ΔT is calibrated with a measuring cylinder to obtain the mass m. At this time, the measured value of the flow sensor is calibrated to obtain the calibration coefficient k. ER , If the flow sensor measures n T times, the flow sensor measurement value is calibrated to M' T , The grain harvest M2 in the ΔT+T time period is:

[0081] Therefore, the total grain harvest during the harvest process M 总 for:

[0082] Where: n1 is the number of times no calibration is done during the harvest process; n2 is the total number of calibrations during the harvest process; M 1i represents the i-th uncalibrated grain harvest; M 2i represents the grain harvest at the i-th calibration.

[0083] While the flow sensor is being calibrated using the metering cylinder, the grain moisture content can also be measured. The product of the grain density ρ and the grain volume V under ideal moisture conditions in the field is the calibrated grain mass m of the counterweight. Grain moisture content varies from field to field, and the calibrated grain mass m of the counterweight can be adjusted by adding or removing magnetic steel.

[0084] The stirring motor 18 drives the stirrer 22 to rotate, making the top of the grain pile in the measuring cylinder smoother. After the bottom of the grain storage cylinder is closed and stirred, when the signals of the two groups of photoelectric sensor arrays 21 are stable, the volume of grain V′ in the measuring cylinder is calculated based on the position of the triggered photoelectric sensor array at this time.

[0085] When the counterweight and the metering cylinder are in equilibrium, due to the moisture content, the volume V′ of the grain in the metering cylinder 11 when the grain calibrated mass m is reached is greater than the volume V of the grain in the metering cylinder 11 under the ideal moisture content condition. The moisture content w of the grain measured in a single time is:

[0086] Where ρ is the grain density under the ideal moisture content of the working plot; V is the grain volume under the ideal moisture content of the working plot; V′ is the grain volume in the measuring cylinder under equilibrium; m is the calibrated mass of the measuring cylinder under ideal moisture content, m = ρV.

[0087] The average moisture content of grains in the harvested plot is:

[0088] Where n w is the total number of moisture content measurements.

[0089] Example 2

[0090] This embodiment provides a method for monitoring grain harvest with a moisture content measurement function, using the grain harvest monitoring device with a moisture content measurement function described in Example 1, including:

[0091] When the balancing arm is in a balanced state, the calibrated mass of the grain is obtained according to the mass of the counterweight;

[0092] The grain mass flowing through the grain storage device during the mass calibration period is obtained based on the grain flow signal from the flow sensor, and the grain mass obtained by the flow sensor is calibrated based on the error between the calibrated grain mass and the measured grain mass, thereby obtaining the total grain harvest; wherein the mass calibration period is the period from the start of calibration to the time when the balance arm is in a balanced state;

[0093] When the balancing arm is in a balanced state, the volume of the grain in the metering device is obtained according to the trigger position of the photoelectric sensor array, and the moisture content of the grain is obtained according to the volume of the grain.

[0094] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A grain harvest monitoring device with a water content measurement function, characterized in that, Including: a processor, a grain storage device, a metering device disposed below the grain storage device, and a counterweight device connected to the metering device; a flow sensor is provided on the grain storage device for detecting the grain flow rate; an optoelectronic sensor array is provided on the metering device; the counterweight device includes counterweight blocks and a balance arm, with a counterweight block and the metering device respectively disposed on both sides of the balance arm; the processor is configured to, when the balance arm is in a balanced state, obtain the calibrated grain mass based on the mass of the counterweight block, obtain the volume of the grain in the metering device based on the triggering position of the optoelectronic sensor array; obtain the measured grain mass flowing through the grain storage device during the mass calibration time period based on the grain flow signal, calibrate the grain mass obtained by the flow sensor according to the error between the calibrated grain mass and the measured grain mass, thereby obtaining the total grain harvest, and obtain the grain moisture content based on the grain volume; wherein, the mass calibration time period is the time period from the start of calibration to when the balance arm is in a balanced state.

2. The grain harvest monitoring device with moisture content measurement function according to claim 1, characterized in that the grain storage device includes a grain storage cylinder provided with a flow sensor and a grain storage cylinder flap device for opening and closing the grain storage cylinder; the grain storage cylinder flap device includes a grain storage cylinder flap motor, a grain storage cylinder flap, and a grain storage cylinder push-pull electromagnet, the rotating shaft of the grain storage cylinder flap is installed on the outer wall of the grain storage cylinder and connected to the grain storage cylinder flap motor, the grain storage cylinder push-pull electromagnet is installed at the bottom of the grain storage cylinder and is arranged at 90° to the rotating shaft of the grain storage cylinder flap for supporting and fixing the grain storage cylinder flap.

3. The grain harvest monitoring device with moisture content measurement function according to claim 1, characterized in that, the metering device includes a metering cylinder and a metering cylinder flap device for opening and closing the metering cylinder; the metering cylinder is installed on the balance arm, and the optoelectronic sensor array is installed at 90° on the wall of the bell mouth of the metering cylinder; the metering cylinder flap device includes a metering cylinder flap, a metering cylinder push-pull electromagnet, and a metering cylinder flap motor, the rotating shaft of the metering cylinder flap is installed on the outer wall of the metering cylinder and connected to the metering cylinder flap motor, the metering cylinder push pull electromagnet is installed at the bottom of the metering cylinder and is arranged at 90° to the rotating shaft of the metering cylinder flap for supporting and fixing the metering cylinder flap.

4. A grain harvest monitoring device with a moisture content measurement function according to claim 2 or 3, characterized in that at the start of calibration, the metering cylinder flap motor drives the metering cylinder flap to rotate to close the bottom of the metering cylinder, and the push rod of the metering cylinder push-pull electromagnet extends to fix the metering cylinder flap; when there is a trigger signal from the optoelectronic sensor array, the grain storage cylinder flap motor drives the grain storage cylinder flap to rotate to gradually reduce the opening at the bottom of the grain storage cylinder; when the balance arm is in a balanced state, the grain storage cylinder flap motor drives the grain storage cylinder flap to rotate to close the bottom of the grain storage cylinder, and the grain storage cylinder push-pull electromagnet fixes the grain storage cylinder flap; after calibration is completed, control the push rod of the metering cylinder push-pull electromagnet to retract, and the metering cylinder flap motor drives the metering cylinder flap to rotate to open the bottom of the metering cylinder; when the grain in the metering cylinder is emptied, control the push rod of the grain storage cylinder push-pull electromagnet to retract, and the grain storage cylinder flap motor drives the grain storage cylinder flap to rotate to open the grain storage cylinder.

5. The grain harvest monitoring device with moisture content measurement function according to claim 1, characterized in that, the counterweight device further includes a support mechanism, and the support mechanism includes a support base, a support seat, a positioning plate, a support seat bearing, a force sensor, a damper, a support block, and a contact switch; The support base is arranged on the supporting pedestal, and the balance arm is connected to the support base through a support base bearing, and makes a vertical movement with the support base as the fulcrum; Two dampers and two force sensors are arranged between the supporting pedestal and the balance arm; The positioning plate is installed on the grain box of the harvester and is arranged opposite to the counterweight. The positioning plate is provided with a support block and a contact switch, On the side of the supporting pedestal opposite to the counterweight, there are a support block and a contact switch.

6. The grain harvest monitoring device with a moisture content measurement function according to claim 5, characterized in that The balance arm is in a balanced state when the values of the two force sensors are equal or within a set threshold range, and when the counterweight triggers the contact switch on the positioning plate, the balance arm is in a balanced state; After the calibration is completed and the grain in the measuring cylinder is emptied, the counterweight falls onto the support block of the supporting pedestal and triggers the contact switch at the same time.

7. The grain harvest monitoring device with moisture content measurement function according to claim 1, characterized in that, The measured mass M′ of the grain flowing through the grain storage device at the sampling time interval Δt is: M′ = gΔt 2 ·ρS; the number of sampling times of the flow sensor within the mass calibration time period ΔT is n′, and thus the average value of the measured grain mass is: M′ i represents the measured grain mass of the i-th sampling of the flow sensor; By judging The error ΔM from the calibrated quality of the grain and the set value M ER are used to determine whether to calibrate the grain quality obtained from the flow sensor, and the total harvested grain amount M obtained therefrom 总 is as follows: Where: n1 is the number of times without calibration during the harvesting process; n2 is the total number of calibrations during the harvesting process; S is the area of the grain flowing through the grain storage device; ρ is the grain density, M 1i represents the grain harvesting amount without calibration for the i-th time, M 2i represents the grain harvesting amount with calibration for the i-th time.

8. The grain harvest monitoring device with a moisture content measurement function according to claim 7, characterized in that When ΔM is less than or equal to the set value M ER no calibration is performed. If the total number of sampling times of the flow sensor within the mass calibration time period ΔT and the interval time period T before calibration is n ΔT+T1 , then the grain harvest amount M1 is: S i represents the area of the grain flowing through the grain storage cylinder detected for the i-th time; When ΔM is greater than the set value, calibration is performed, and the grain harvest amount during the mass calibration time period ΔT is Calibrate the mass m of the object to obtain the calibration coefficient k ER is If the number of sampling times of the flow sensor within the interval time period T before calibration is n T times, the measured value of the flow sensor is calibrated to M' T , The grain harvest M2 during the period of ΔT + T is: M2 = m + M' T .

9. The grain harvest monitoring device with moisture content measurement function according to claim 1, characterized in that, The moisture content of the grain obtained based on the grain volume is as follows: where n w is the total number of measurements of the moisture content of the grain; W i is the moisture content of the grain measured at the i-th time; ρ is the density of the grain under the ideal moisture content conditions of the operation plot; V is the volume of the grain under the ideal moisture content conditions of the operation plot; V′ is the volume of the grain in the measuring cylinder in the equilibrium state; m is the calibrated mass of the measuring cylinder under the ideal moisture content conditions.

10. A method for monitoring the grain harvest with the function of measuring the moisture content, characterized in that, Using the grain harvest monitoring device with a moisture content measurement function according to any one of claims 1-9, including: When the balance arm is in a balanced state, the calibrated grain mass is obtained according to the mass of the counterweight; The measured grain mass flowing through the grain storage device during the mass calibration time period is obtained according to the grain flow signal of the flow sensor, and the grain mass obtained by the flow sensor is calibrated according to the error between the calibrated grain mass and the measured grain mass, thereby obtaining the total grain harvest amount; wherein, the mass calibration time period is the time period from the start of calibration to when the balance arm is in a balanced state; When the balance arm is in a balanced state, the volume of the grain in the measuring device is obtained according to the triggering position of the photoelectric sensor array, and the moisture content of the grain is obtained according to the grain volume.

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