A cleaning loss monitoring device and method with lost grain collection function

Abstract

The present invention discloses a cleaning loss monitoring device and method with a lost grain collecting function. The monitoring device comprises a cleaning loss device obliquely installed at a cleaning and screening outlet of a harvester, a cleaning loss sensor installed below the cleaning loss device and parallel to the cleaning loss device, and a grain collecting device horizontally installed on the harvester and located below the cleaning loss sensor. The monitoring method uses a cleaning loss sensor and a photoelectric sensor to monitor the cleaning loss in the full width direction of the harvester, and corrects the monitoring value of the cleaning loss sensor according to the amount of lost grain grains collected, thereby improving the monitoring accuracy while expanding the monitoring range.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent agricultural machinery, and in particular to a cleaning loss monitoring device and method with a lost grain collection function. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Cleaning loss is one of the main losses of combine harvesters in field operations. When the harvester is operating, it is inevitable that some grains will be discharged from the machine through the cleaning screen along with the debris due to inappropriate fan speed, excessive cleaning load and other reasons. Since the grains in the debris are very few compared to the stems and grass, the complex field operating conditions, coupled with the influence of machine vibration and other strong interference signals, make the identification and extraction of grain signals extremely difficult. At present, the detection of cleaning losses for combine harvesters mainly adopts the post-process manual detection method, which has a large workload, high work intensity, and a long time consumption, and cannot provide real-time feedback of status data to the harvesting equipment. Real-time monitoring of cleaning losses is an issue that needs to be urgently addressed in the development of intelligent harvesters. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a cleaning loss monitoring device and method with a lost grain collection function, which can collect the lost grains discharged by the cleaning screen, and use a cleaning loss sensor and a photoelectric sensor to monitor the cleaning loss in the full width direction of the harvester. The monitoring value of the cleaning loss sensor is corrected according to the number of lost grain grains collected, thereby improving the monitoring accuracy while expanding the monitoring range.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a cleaning loss monitoring device with a lost grain collection function, comprising: a processor, a cleaning device installed at a cleaning and screening outlet of a grain harvester, a cleaning loss sensor installed below the cleaning loss sensor, and a grain collecting device installed below the cleaning loss sensor;

[0007] The cleaning loss sensor is used to monitor the grains dropped from the impurity removal device;

[0008] The grain collecting device comprises a screening device for secondary screening of fallen grains and a collecting and measuring device for collecting the screened grains, wherein a photoelectric sensor for monitoring the collected grains is provided in the collecting and measuring device;

[0009] The processor is configured to determine the number of grains impacting the cleaning loss sensor and the number of grains falling into the collecting and measuring device respectively based on the grain signal of the cleaning loss sensor and the photoelectric signal of the photoelectric sensor, thereby obtaining the first cleaning loss mass in the monitoring area of ​​the cleaning loss sensor and the second cleaning loss mass in the monitoring area of ​​the photoelectric sensor, and correct the first cleaning loss mass based on the second cleaning loss mass and a set error threshold, thereby obtaining the total cleaning loss amount.

[0010] As an optional implementation, the cleaning loss sensor is installed on the grain harvester through a bracket. Under the parameter conditions of different fan speeds, cleaning screen vibration frequencies and sieve hole openings, the areas where the grains and debris discharged by the cleaning screen fall are gridded, the grains in each grid area are collected, and a distribution model of the grains discharged by the cleaning screen is established. According to the grain distribution model, the position where the grains are relatively concentrated in the width direction under different parameter conditions is selected as the installation position of the cleaning loss sensor.

[0011] As an optional implementation, the sensing units of the cleaning loss sensor are arranged in an array, including, from top to bottom, a protective layer, a PI layer, a TPU layer, a PVDF layer, a TPU layer, a PI layer and a buffer layer.

[0012] As an optional embodiment, the screening device includes a mesh screen, a vibration motor and a variable frequency fan; the mesh screen is horizontally installed below the cleaning loss sensor and is connected to the vibration motor through a driving connecting rod. The vibration motor drives the mesh screen to move through the driving connecting rod so that the grains fall from the screen holes of the mesh screen. The variable frequency fan is installed on one lateral side of the mesh screen, and the rotation speed of the vibration motor and the variable frequency fan is adjusted according to the grain signal monitored by the cleaning loss sensor.

[0013] As an optional implementation, the collecting and measuring device includes a collecting funnel and a collecting box. The collecting funnel is installed below the mesh screen, the collecting box is installed below the collecting funnel, and a photoelectric sensor is installed on the cylindrical wall of the collecting funnel.

[0014] As an optional implementation, two cleaning loss sensors are used, and the monitoring length of each cleaning loss sensor is l, then the full width direction monitoring area of ​​the cleaning loss sensor is 2l, and the first cleaning loss mass is The full width monitoring area of ​​the photoelectric sensor is l ′ , l ′ =L-2l, the second cleaning loss mass is Where: L is the width of the grain harvester’s cleaning and screening opening; is the thousand-grain weight of grains in the operating field measured before the operation; n1 is the total number of grains monitored by the cleaning loss sensor; n2 is the total number of grains monitored by the photoelectric sensor.

[0015] As an optional implementation, the process of correcting the first cleaning loss quality includes:

[0016] Assume that within the time interval T, the number of measurements of the cleaning loss sensor and the photoelectric sensor are k1 and k2 respectively, and the mean values ​​of the first cleaning loss quality are determined respectively. and the second cleaning loss mass mean

[0017] If the detection method of photoelectric sensors is adopted in all width directions, the measured values ​​in the monitoring area of ​​the loss sensor are cleared. for:

[0018] according to and The error Δm between the two and the set error threshold m ER The comparison results are used to correct the first cleaning loss quality.

[0019] As an alternative embodiment, when Δm is less than or equal to m ER When the first cleaning loss mass within the time interval T is not corrected, the loss m a for:

[0020] When Δm is greater than m ER Correction is made when the correction factor k ER for: The corrected loss m b for:

[0021] As an optional embodiment, the total cleaning loss m 总 for: Among them: j1 is the number of uncorrected times; j2 is the number of corrected times.

[0022] In a second aspect, the present invention provides a method for monitoring grain loss with a function of collecting lost grains, comprising:

[0023] The grains dropped from the impurity removal device are monitored by a cleaning loss sensor arranged below the impurity removal device, and the collected grains are monitored by a photoelectric sensor arranged in the collection and measurement device;

[0024] Determine the number of grains impacting the cleaning loss sensor according to the grain signal of the cleaning loss sensor, thereby obtaining the first cleaning loss mass in the monitoring area of ​​the cleaning loss sensor;

[0025] Determine the number of grains that fall into the collecting and measuring device according to the photoelectric signal of the photoelectric sensor, thereby obtaining the second cleaning loss mass in the monitoring area of ​​the photoelectric sensor;

[0026] According to the second cleaning loss quality and the set error threshold, the first cleaning loss quality is corrected to obtain the total cleaning loss amount.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention proposes a cleaning loss monitoring device and method with a function of collecting lost grains. The monitoring device includes a cleaning device obliquely installed at the cleaning screen outlet of a harvester, a cleaning loss sensor installed below the cleaning device and parallel to the cleaning device, and a grain collecting device horizontally installed on the harvester and located below the cleaning loss sensor. The monitoring method adopts two methods, one is the cleaning loss sensor monitoring, which has good real-time measurement performance; the other is the photoelectric sensor monitoring, which performs secondary wind screening on the discharged grain mixture, has less impurities, and the measurement result is relatively accurate. The present invention combines the advantages of both, corrects the monitoring value of the cleaning loss sensor according to the set error threshold, and finally obtains the total cleaning loss. The monitoring device and method of the present invention can collect the lost grains discharged by the cleaning screen, can not only monitor the cleaning loss in the full width direction of the harvester, but also correct the cleaning loss monitoring value, thereby expanding the monitoring range and improving the monitoring accuracy.

[0029] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings in the specification, 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.

[0031] Figure 1 An axonometric diagram of the cleaning loss monitoring device provided in Example 1 of the present invention;

[0032] Figure 2 A side view of the cleaning loss monitoring device provided in Example 1 of the present invention;

[0033] Figure 3 A front view of the cleaning loss monitoring device provided in Example 1 of the present invention;

[0034] Figure 4 A schematic diagram of the arrangement of the sensing units of the cleaning loss sensor provided in Example 1 of the present invention;

[0035] Figure 5 A layered schematic diagram of a sensing unit of a cleaning loss sensor provided in Example 1 of the present invention;

[0036] Among them, 1. impurity removal device; 2. vibration motor; 3. cleaning loss sensor; 4. mesh screen; 5. collecting funnel; 6. collecting box; 7. bracket; 8. photoelectric sensor; 9. sensing unit; 9-1. protective layer; 9-2. PI layer; 9-3. TPU layer; 9-4. PVD layer; 9-5. TPU layer; 9-6. PI layer; 9-7. buffer layer; 10. variable frequency fan; 11. driving connecting rod. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0039] 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 of their variations 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.

[0040] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0041] Example 1

[0042] like Figure 1 As shown, this embodiment provides a cleaning loss monitoring device with a lost grain collection function, including: a processor, a dedusting device 1 obliquely installed at a cleaning and screening outlet of a grain harvester, a cleaning loss sensor 3 installed below the dedusting device 1 and parallel to the dedusting device 1, and a grain collecting device horizontally installed on the grain harvester and located below the cleaning loss sensor 3.

[0043] In this embodiment, the impurity removal device 1 is a comb-tooth structure, and the comb-tooth gap can be adjusted to block large impurities such as large stems and weeds. Grains and light impurities fall from the comb-tooth gap onto the cleaning loss sensor 3.

[0044] In this embodiment, two cleaning loss sensors 3 are arranged on the grain harvester through a bracket 7. The bracket 7 is connected to the grain harvester. The cleaning loss sensors 3 are installed on the bracket 7 and can be adjusted in the left and right directions.

[0045] In this embodiment, if Figure 4-5 As shown, the sensing units 9 of the cleaning loss sensor 3 are arranged in a 2×4 array and installed on a hard substrate; from top to bottom, they are respectively a protective layer 9-1, a PI layer 9-2, a TPU layer 9-3, a PVDF layer 9-4, a TPU layer 9-5, a PI layer 9-6, and a buffer layer 9-7. The signal line is connected from the PVDF layer 9-4. The TPU layer 9-3 and the TPU layer 9-5 are processed to form a surface microstructure, and a layer of gold is sputtered on the surface microstructure to improve the response speed and detection accuracy of the sensing unit 9.

[0046] In this embodiment, the grain collecting device includes a screening device for secondary screening of fallen grains and a collecting and measuring device for collecting the screened grains.

[0047] The screening device comprises a mesh screen 4, a vibration motor 2 and a variable frequency fan 10; Figure 3 As shown, the mesh screen 4 is horizontally installed below the cleaning loss sensor 3, and is connected to the vibration motor 2 through the driving connecting rod 11. The vibration motor 2 drives the mesh screen 4 to move up, down, left and right through the driving connecting rod 11, so that the grains fall from the sieve holes of the mesh screen 4; the variable frequency fan 10 is installed on one lateral side of the mesh screen 4 to blow away light impurities or small stems from the mesh screen 4.

[0048] The rotation speed of the vibration motor 2 and the variable frequency fan 10 is adjusted in real time according to the grain signal monitored by the cleaning loss sensor 3, and the rotation speed is increased when the detected value is large; specifically, when the number of grains monitored by the cleaning loss sensor 3 increases, the rotation speed of the vibration motor 2 and the variable frequency fan 10 is increased to ensure that the debris falling on the mesh screen 4 can be cleaned; when the number of grains detected by the cleaning loss sensor 3 is zero and the machine travel speed is also zero, the machine harvesting operation is stopped at this time, and the vibration motor 2 and the variable frequency fan 10 are controlled and adjusted to run at the maximum speed to clean up the debris remaining on the mesh screen 4.

[0049] The collecting and measuring device comprises a collecting funnel 5, a photoelectric sensor 8 and a collecting box 6; Figure 1-2 As shown, the collecting funnels 5 are installed below the mesh screen 4, one on each side. A collecting box 6 is provided below each collecting funnel 5. The photoelectric sensor 8 is installed on the cylindrical wall of the collecting funnel 5 to detect the number of grains falling into the collecting box 6 after screening, and then calculate the quality of the grains.

[0050] In this embodiment, in order to realize the monitoring of the cleaning loss in the full width direction, two monitoring methods are adopted: one is to monitor by the cleaning loss sensor 3, using two cleaning loss sensors, each with a length of l, and a full width monitoring range of 2l; the other is to monitor by the photoelectric sensor 8, with a full width monitoring range of l ′, l ′ =L-2l, where L is the width of the harvester's cleaning and screening outlet.

[0051] First, a cleaning loss sensor monitoring method is provided, wherein the number of grains impacting the cleaning loss sensor is determined according to the grain signal of the cleaning loss sensor, thereby obtaining the first cleaning loss mass in the monitoring area of ​​the cleaning loss sensor; specifically, the method includes:

[0052] Through experiments, under different parameters such as fan speed, cleaning screen vibration frequency, sieve hole opening, etc., the area where the seeds and debris discharged from the cleaning screen fall is gridded, the seeds in each small grid area are collected, and a mathematical model of the distribution of the seeds discharged from the cleaning screen is established. According to the distribution model, the position where the seeds are relatively concentrated in the width direction under different parameters is selected as the installation position of the cleaning loss sensor 3.

[0053] After the cleaning loss sensor 3 is arranged according to the determined installation position, the grains fall from the comb teeth gap of the impurity removal device 1 onto the sensing unit 9 of the cleaning loss sensor 3. Due to the different masses of the grains and the light impurities, the maximum deformation and deformation time caused by the collision are also different. According to the Hertz contact theory, the collision time is t i :

[0054]

[0055] Where: m is the mass of the collision object; v n is the normal velocity of the collision; E * is the effective particle elastic modulus, R * is the effective particle radius.

[0056] v n =(v0+gt)·sinθ

[0057]

[0058] Among them: v0 is the initial velocity in the vertical direction; t is the time from the outlet of the cleaning screen to the sensor surface; θ is the angle between the sensor surface and the vertical direction; h is the vertical distance from the sensor to the outlet of the cleaning screen.

[0059] The collision time t of grain and debris on the sensor unit i is the response time of the sensor unit, according to the calculated collision time t i , design the sensor signal hardware circuit, can clearly i Related parameters such as filter circuit cutoff frequency, comparator voltage threshold, etc. According to the formula, it can be seen that the distance h from the cleaning loss sensor to the cleaning screen outlet is related to the normal speed v of the collision. n If there is a positive correlation, the optimal sensor unit response time parameter can be obtained by adjusting the distance h.

[0060] The impact signal detected by the cleaning loss sensor 3 is fed back to the controller, and after processing, the number of grains that impact the cleaning loss sensor is obtained, and then the first cleaning loss mass m1 in the 2l area is obtained: in: is the thousand-grain weight of grains in the operating field measured before the operation; n1 is the total number of grains monitored by the two cleaning loss sensors.

[0061] Then, a photoelectric sensor monitoring method is used to determine the number of grains falling into the collecting and measuring device according to the photoelectric signal of the photoelectric sensor, thereby obtaining the second cleaning loss quality in the photoelectric sensor monitoring area; specifically, it includes:

[0062] The grains discharged from the impurity outlet of the harvester fall from the comb teeth of the impurity removal device 1. The grains in the area 21 hit the cleaning loss sensor 3 and then bounce to the ground. ′ The grains in the area fall onto the mesh screen 4. The rotation speeds of the vibration motor 2 and the variable frequency fan 10 are adjusted in real time according to the grain signal detected by the cleaning loss sensor 3. When the number of grains detected by the cleaning loss sensor 3 increases, the rotation speeds of the vibration motor 2 and the variable frequency fan 10 are increased to ensure that the debris falling on the mesh screen 4 can be cleaned up; when the number of grains detected by the cleaning loss sensor 3 is zero and the machine travel speed is also zero, the machine harvesting operation is stopped at this time, and the control system adjusts the vibration motor 2 and the variable frequency fan 10 to run at the maximum speed to clean up the debris remaining on the mesh screen 4.

[0063] The grains pass through the mesh holes of the mesh screen 4 and slide into the collecting box 6 through the collecting funnel 5. The photoelectric sensor 8 on the cylinder of the collecting funnel 5 counts the grains that slide into the collecting box 6. The thousand-grain weight of the grains in the working plot measured before the operation is calculated. ′ The second cleaning loss mass m2 in the range: in: is the thousand-grain weight of grains in the working field measured before the operation; n2 is the total number of grains monitored by the two photoelectric sensors.

[0064] When the photoelectric signal is always in the triggering state, the collecting box 6 is in the full state, and the control system alarms and prompts the operator to clear the grains in the collecting box.

[0065] Finally, due to the good real-time performance of the cleaning loss detection sensor and the relatively accurate measurement results of the photoelectric sensor monitoring due to the secondary air screening cleaning, there is less debris. Therefore, the advantages of both are combined to correct the first cleaning loss quality; specifically, the following are included:

[0066] The average value of the first cleaning loss mass and the second cleaning loss mass within a period of time is taken, and at this time, the grains are considered to be uniformly distributed within the full-width monitoring range of the cleaning loss sensor and the photoelectric sensor;

[0067] In the time interval T, the number of measurements of the cleaning loss sensor and the photoelectric sensor are k1 and k2 respectively, and the mean values ​​of the grain quality are and

[0068]

[0069]

[0070] If the photoelectric detection method is used in all width directions, the measured value of the monitoring area of ​​the loss sensor is for:

[0071] ① When and The error Δm is less than or equal to the set value m ER When The first cleaning loss mass within the time interval T is not corrected, and the loss amount m a for:

[0072]

[0073] ② When and The error Δm is greater than the set value m ER When Correct the measured value within the time interval T, the correction coefficient k ER for:

[0074] Corrected loss amount m b for:

[0075] Then, the total grain loss during harvesting is m 总 for:

[0076] Where: j1 is the number of times the measured value in the harvest process is not corrected; j2 is the total number of corrections in the harvest process.

[0077] Example 2

[0078] This embodiment provides a method for monitoring grain loss with a function of collecting grain loss, using the device for monitoring grain loss described in Embodiment 1, comprising:

[0079] By installing an impurity removal device at the impurity screening outlet of a grain harvester, installing a cleaning loss sensor below the impurity removal device, and installing a grain collecting device below the cleaning loss sensor, the grain collecting device includes a screening device for secondary screening of fallen grains and a collecting and measuring device for collecting the screened grains, wherein a photoelectric sensor is provided in the collecting and measuring device;

[0080] The kernels dropped from the impurity removal device are monitored by a cleaning loss sensor, and the collected kernels are monitored by a photoelectric sensor;

[0081] Determine the number of grains impacting the cleaning loss sensor according to the grain signal of the cleaning loss sensor, thereby obtaining the first cleaning loss mass in the monitoring area of ​​the cleaning loss sensor;

[0082] Determine the number of grains that fall into the collecting and measuring device according to the photoelectric signal of the photoelectric sensor, thereby obtaining the second cleaning loss mass in the monitoring area of ​​the photoelectric sensor;

[0083] According to the second cleaning loss quality and the set error threshold, the first cleaning loss quality is corrected to obtain the total cleaning loss amount.

[0084] Although the above describes the specific implementation mode 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 creative work are still within the scope of protection of the present invention.

Claims

1. A cleaning loss monitoring device with a lost grain collection function, characterized in that: include: A processor, a debris removal device installed at a debris removal port of a grain harvester, a cleaning loss sensor installed below the debris removal device, and a grain collecting device installed below the cleaning loss sensor; The cleaning loss sensor is used to monitor the grains dropped from the impurity removal device; two cleaning loss sensors are used, and the monitoring length of each cleaning loss sensor is l , then the full width monitoring area of ​​the cleaning loss sensor is 2 l , the first cleaning loss mass is ; The full width monitoring area of ​​the photoelectric sensor is , , the second cleaning loss quality is ;in: The width of the screen for grain harvesters to clean and screen out debris; It is the grain weight of the grains in the working plot measured before the operation; The total number of kernels monitored by the cleaning loss sensor; is the total number of grains monitored by the photoelectric sensor; The process of correcting the first cleaning loss quality includes: Set at time interval T The number of measurements of the cleaning loss sensor and the photoelectric sensor are and , and the mean value of the first cleaning loss quality is determined respectively and the second cleaning loss mass mean ; If the detection method of photoelectric sensors is adopted in all width directions, the measured values ​​in the monitoring area of ​​the loss sensor are cleared for: ;according to and The error between The error threshold is set The comparison result is used to correct the first cleaning loss quality; when Less than or equal to When the time interval T The first cleanup loss quality within is not corrected, so the loss amount for: ;when Greater than Correction factor for: The corrected loss amount is for: ; The grain collecting device comprises a screening device for secondary screening of fallen grains and a collecting and measuring device for collecting the screened grains, wherein a photoelectric sensor for monitoring the collected grains is provided in the collecting and measuring device; The processor is configured to determine the number of grains impacting the cleaning loss sensor and the number of grains falling into the collecting and measuring device respectively based on the grain signal of the cleaning loss sensor and the photoelectric signal of the photoelectric sensor, thereby obtaining the first cleaning loss mass in the monitoring area of ​​the cleaning loss sensor and the second cleaning loss mass in the monitoring area of ​​the photoelectric sensor, and correct the first cleaning loss mass based on the second cleaning loss mass and a set error threshold, thereby obtaining the total cleaning loss amount.

2. A cleaning loss monitoring device with a lost grain collection function as claimed in claim 1, characterized in that: The cleaning loss sensor is installed on the grain harvester through a bracket. Under the parameter conditions of different fan speeds, cleaning screen vibration frequencies and sieve hole openings, the areas where the grains and debris discharged by the cleaning screen fall are gridded, the grains in each grid area are collected, and a distribution model of the grains discharged by the cleaning screen is established. According to the grain distribution model, the position where the grains are relatively concentrated in the width direction under different parameter conditions is selected as the installation position of the cleaning loss sensor.

3. A cleaning loss monitoring device with a lost grain collection function as claimed in claim 1, characterized in that: The sensing units of the cleaning loss sensor are arranged in an array.

4. A cleaning loss monitoring device with a lost grain collection function as claimed in claim 1, characterized in that: The screening device includes a mesh screen, a vibration motor and a variable frequency fan; the mesh screen is horizontally installed below the cleaning loss sensor and is connected to the vibration motor through a driving connecting rod. The vibration motor drives the mesh screen to move through the driving connecting rod so that the grains fall from the screen holes of the mesh screen. The variable frequency fan is installed on one lateral side of the mesh screen, and the rotation speeds of the vibration motor and the variable frequency fan are adjusted according to the grain signal monitored by the cleaning loss sensor.

5. A cleaning loss monitoring device with a lost grain collection function as claimed in claim 4, characterized in that: The collecting and measuring device comprises a collecting funnel and a collecting box. The collecting funnel is installed below the mesh screen, the collecting box is installed below the collecting funnel, and a photoelectric sensor is installed on the cylindrical wall of the collecting funnel.

6. A cleaning loss monitoring device with a lost grain collection function as claimed in claim 1, characterized in that: Total cleaning loss for: ;in: is the number of uncorrected times; Number of corrections.

7. A method for monitoring grain loss with a function of collecting lost grains, characterized in that: The cleaning loss monitoring device according to any one of claims 1 to 6 comprises: The grains dropped from the impurity removal device are monitored by a cleaning loss sensor arranged below the impurity removal device, and the collected grains are monitored by a photoelectric sensor arranged in the collection and measurement device; Determine the number of grains impacting the cleaning loss sensor according to the grain signal of the cleaning loss sensor, thereby obtaining the first cleaning loss mass in the monitoring area of ​​the cleaning loss sensor; Determine the number of grains that fall into the collecting and measuring device according to the photoelectric signal of the photoelectric sensor, thereby obtaining the second cleaning loss mass in the monitoring area of ​​the photoelectric sensor; According to the second cleaning loss quality and the set error threshold, the first cleaning loss quality is corrected to obtain the total cleaning loss amount.

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