Agricultural machine granary and online material level detection method thereof

Abstract

The present application relates to a kind of agricultural machinery granary and its material level on-line detection method, including whole vehicle information terminal, signal processor, light source, bar sensor.Whole vehicle information terminal is used to display the final result of granary material level, it is a man-machine interactive interface;Signal processor is whether the data of control light source works, reads bar sensor, integrates data and completes the calculation of granary material level data;Light source works as the input source of bar sensor;Bar sensor belongs to optical sensor, when sensor is covered by grain, the input of light source is shielded.A kind of granary material level detection method refers to, through signal processor, light source is lit, and the photosensitive information of bar sensor is read in real time, after summarizing calculation, the final result of granary material level is obtained, and is uploaded to whole vehicle information terminal.The present application can realize the real-time on-line monitoring of crop yield.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of digital transformation of agricultural machinery and equipment, and particularly relates to an agricultural machinery grain bin and an online detection method for a grain level thereof. BACKGROUND

[0002] Accelerating the digital transformation of agricultural machinery and equipment is an important support for promoting the development of agricultural informatization. In the crop harvesting link, realizing real-time online monitoring of yield is not only the basis for building arable land food production capacity evaluation, but also an important part of agricultural operation state monitoring. However, there is no mature solution in the industry. In the process of combined operation of agricultural machinery, it is mainly divided into four processes of harvesting, threshing, collecting to the grain bin and transferring to the transport vehicle. Among them, the process of grain particles gathering in the grain bin is the most stable, and it has good feasibility to measure the change of grain quantity in the grain bin in real time.

[0003] In the related field of measuring granular or powdery material storage bins, the common solution is to use a laser radar or a stereo vision camera installed on the top of the bin body to measure the material level, and the precision can reach within 1cm. However, in the process of agricultural operation, the grain particles are sprayed into the grain bin at a certain speed through the feeding port and are randomly scattered in the grain bin, which will seriously interfere with the light signal, resulting in that the laser radar or visual recognition solution cannot be used. SUMMARY

[0004] The purpose of the present application is to provide an agricultural machinery grain bin and an online detection method for a grain level thereof, so as to solve the problem that the detection of the grain level of the agricultural machinery grain bin is easily disturbed by the feeding in the prior art, resulting in inaccurate detection results.

[0005] To achieve the above-mentioned purpose, the scheme of the present application includes:

[0006] A technical scheme of an online detection method for a grain level of an agricultural machinery grain bin, a strip-shaped sensor is vertically arranged in the grain bin, and a plurality of light sensing circuits are arranged on the strip-shaped sensor; each light sensing circuit includes a light sensing point for detecting the ambient brightness; if the ambient brightness of a certain light sensing point is changed and the ambient brightness detected by the light sensing points below the light sensing point are all lower than a preset brightness threshold, the height corresponding to the light sensing point is output as the grain level height.

[0007] The present application has the beneficial effects that the grain level height in the grain bin can be detected in real time, the precision of the grain level measurement is not affected by the vibration of the grain, and is not affected by the type and humidity of the grain. Compared with the existing single-point measurement full-bin sensor, the present application has higher precision. The present application can also predict the full-time of the grain bin in advance through the change trend of the grain level, timely dispatch the transfer vehicle, and improve the overall operation efficiency.

[0008] Further, the photosensitive circuit comprises a photosensitive device, a photosensitive part of the photosensitive device forms a photosensitive point on the strip-shaped sensor; one end of the photosensitive device is connected with a power supply, and the other end is connected with one input end of a comparator; the other input end of the comparator is connected with a brightness threshold setting voltage, and the output end of the comparator is connected with a shift register; the shift register comprises a cascade port for cascading a plurality of strip-shaped sensors and an output end for outputting detection results.

[0009] The present application has the beneficial effect that the strip-shaped sensor arranged in the middle of the grain depot contains a plurality of photosensitive point circuits for monitoring the ambient brightness, and the density of the photosensitive points determines the resolution of the material level detection.

[0010] Further, at least one light source is arranged on the top of the grain depot and faces the photosensitive points.

[0011] The present application has the beneficial effect that the light source is used to enhance the ambient brightness, so that the light and dark contrast is stronger, and the stability of the judgment of whether the photosensitive point is covered by the grain is improved, so that the material level detection is not affected by the ambient light.

[0012] Further, the strip-shaped sensor is vertically arranged in the middle of the grain depot.

[0013] The present application has the beneficial effect that the strip-shaped sensor is vertically fixed in the grain depot, and in order to reduce the error caused by uneven accumulation of grain, the strip-shaped sensor is arranged in the middle in the horizontal projection direction.

[0014] Further, the photosensitive points are equally spaced on the strip-shaped sensor.

[0015] The present application has the beneficial effect that the photosensitive points arranged on the strip-shaped sensor are distributed at equal distances, which facilitates the calculation of the material level height according to the height of the grain depot and the change of the photosensitive points.

[0016] A grain depot for agricultural machinery comprises a depot body and a signal processor, a strip-shaped sensor is vertically arranged in the depot body, and a plurality of photosensitive circuits are arranged on the strip-shaped sensor; each photosensitive circuit comprises a photosensitive point for obtaining the ambient brightness; the signal processor is used to obtain the ambient brightness detected by the photosensitive point and calculate the material level height of the grain depot according to the height of the blocked photosensitive point from the depot bottom.

[0017] Further, the photosensitive circuit comprises a photosensitive device, a photosensitive part of the photosensitive device forms a photosensitive point on the strip-shaped sensor; one end of the photosensitive device is connected with a power supply, and the other end is connected with one input end of a comparator; the other input end of the comparator is connected with a brightness threshold setting voltage, and the output end of the comparator is connected with a shift register; the shift register comprises a cascade port for cascading a plurality of strip-shaped sensors and an output end for outputting detection results.

[0018] Further, at least one light source is further included, which is arranged on the top of the granary and faces one side of the photosensitive point.

[0019] Further, the strip-shaped sensor is vertically arranged in the middle of the granary.

[0020] Further, the photosensitive points are equally spaced on the strip-shaped sensor. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the online detection device system for the granary material level of agricultural machinery according to the present application.

[0022] Figure 2 It is a schematic diagram of the online detection device for the granary material level of agricultural machinery according to the present application.

[0023] Figure 3 It is a schematic diagram of the online detection device for the granary material level of agricultural machinery according to the present application. Figure 2 It is an enlarged view of the strip-shaped sensor I part in the online detection device for the granary material level of agricultural machinery according to the present application.

[0024] Figure 4 It is a photosensitive circuit module of the online detection device for the granary material level of agricultural machinery according to the present application.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1, light source; 2, strip-shaped sensor; 3, signal processor; 4, granary body; 5, grain; 6, photosensitive point. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application will be further described in detail below with reference to the drawings and examples.

[0028] An embodiment of the online detection method for the granary material level of agricultural machinery:

[0029] The online detection method for the granary material level of agricultural machinery according to the present application aims to realize a device that can measure the granary material level of agricultural machinery online. Based on the measurement results and the cross-sectional area of the granary, the number of harvested grains can be calculated in real time.

[0030] Technical principle: Based on the detection of environmental brightness changes by multi-point high-sensitivity ambient light sensors. The sensors covered by grains have very low environmental brightness values due to the blocking of light, while the sensors not covered by grains can detect higher environmental brightness values.

[0031] Composition of the granary material level detection device:

[0032] The granary material level detection device mainly includes: a signal processor, a strip-shaped sensor, and a light source, and the connection relationship is as shown in Figure 1 .

[0033] The signal processor is used for driving the light source, configuring the brightness judgment threshold, reading the state of all light sensing points of the bar sensor, calculating the height of the material level, and communicating with other related devices of the vehicle.

[0034] The bar sensor contains multiple light sensing circuits, and the density of the light sensing points determines the resolution of the material level detection.The light sensing circuit module of the bar sensor can be cascaded to adapt to different granary depths.

[0035] The light source is used to enhance the ambient brightness and make the light and dark contrast stronger, thereby improving the stability of the judgment of whether the light sensing point is covered by the grain. Therefore, for a granary that meets the natural light lighting conditions, when the ambient light is sufficient (for example, sunny day), turning off the light source will not affect the function of the system.

[0036] The device of the application is shown in Figure 2 The bar sensor 2 is vertically fixed inside the granary body 4, and in order to reduce the error caused by uneven accumulation of grain 5, the bar sensor 2 should be as centered as possible in the horizontal projection direction; in order to effectively utilize the light intensity, the light source 1 should be located on the side facing the middle light sensing point 6 (the enlarged view of the bar sensor I part is shown in Figure 3 Figure 3 The bar sensor I part is shown in Figure 2 The bar sensor I part is shown in

[0037] The method for realizing the granary material level detection is as follows: without loss of generality, it is assumed that the height of the effective volume inside the granary is H, the bar sensor 2 contains N equally spaced light sensing points, and the interval between each two light sensing points is H / N. The signal processor 3 reads the state of the N light sensing points from top to bottom, and if the brightness of the first to K light sensing points is higher than the threshold value, and the brightness of K+1 to N is lower than the threshold value, then the material level height is H*(N-K) / N.

[0038] The brightness threshold value is adjusted by DAC conversion or digital potentiometer, which can reduce the brightness threshold value to compensate for the attenuation of the sensor sensitivity, and the minimum value of the threshold value is limited by the maximum dark current Idark of the light sensing element.

[0039] The online detection method for the grain depot level of the agricultural machine can well adapt to the agricultural operation scene, the level measurement precision is not affected by vibration, is not affected by the types and humidity of grains, and is not affected by environmental light. The installation of the system has no influence on the structure of the grain depot and does not change the original working state of the grain depot. The level height can be detected in real time, the precision is higher than that of the existing single-point measurement full-bay sensor, in addition, the full-bay time of the grain depot can be predicted in advance through the change trend of the level, the vehicle is dispatched in time, and the overall operation efficiency is improved. The processing, manufacturing, installation and debugging of the technical scheme are simple, and the application cost is relatively low.

[0040] The light sensing circuit module of the agricultural machine grain depot comprises eight light sensing circuits with light sensing points, and the light sensing circuit module is as shown in the figure. Figure 4 The light sensing circuit module mainly comprises environmental light sensing devices D1-D8, load resistors R1-R8, comparators U1-U8, a shift register and connectors. The types and specifications of the three types of elements, namely the light sensing devices, the load resistors and the comparators, are the same, the connector 1 and the connector 2 can be connected in pairs, so that a plurality of light sensing circuit modules can be cascaded according to the height of the grain depot.

[0041] The signal definitions of the connectors are as follows:

[0042] VCC: power supply of the module;

[0043] GND: ground signal of the module;

[0044] VREF: brightness threshold setting voltage;

[0045] SIN: serial signal input, connected to the serial output of the previous module, and suspended when there is no previous module;

[0046] SOUT: serial signal output;

[0047] SCLK: shift register clock signal;

[0048] LOAD: parallel input loading of the shift register.

[0049] The load resistor is used to convert the output current of the light sensing device into a voltage signal, and the voltage signal is proportional to the brightness. When the voltage is greater than VREF, the comparator outputs a high level, otherwise a low level. The output state of the comparator is controlled and read by the signal processor at a fixed time (for example, every 1 second), and the position of the light sensing point where the state changes can be approximately regarded as the position of the level. In actual application, the light sensing circuit module can also be flexibly designed to have 2, 4, 8, 16 or other number of light sensing points, and the design principle remains unchanged. In addition to white light, other light sources can also be used in the technical scheme, and the corresponding light sensing device needs to be replaced with a device matched with the wavelength of the light source, but compared with white light, it is easy to be disturbed by environmental light.

[0050] An agricultural machine warehouse embodiment:

[0051] The specific installation structure of the agricultural machine warehouse of the present application is shown in Figure 2 The method for on-line detection of the material level of the agricultural machine warehouse of the present application can be realized, and the method and the agricultural machine warehouse of the present application have been sufficiently clear in the method embodiment, and thus will not be described here again.

Claims

1. An online detection method for grain silo level of agricultural machinery, characterized in that, The strip-shaped sensor is vertically arranged in the granary, and the strip-shaped sensor comprises a photosensitive circuit module, the photosensitive circuit module comprises a shift register and a plurality of photosensitive circuits; each photosensitive circuit comprises a photosensitive device for detecting ambient brightness; if it is read that the ambient brightness of a certain photosensitive device changes, and the ambient brightness detected by the photosensitive devices below the photosensitive device are all lower than a preset brightness threshold, the height corresponding to the photosensitive device is output as the material level height; In the same photosensitive circuit module, the output end of the photosensitive device is connected to one input end of a comparator after being grounded through a load resistor, and a brightness threshold setting voltage is provided to the other input end of the comparator; the output end of the comparator is connected to the shift register, and the shift register comprises a cascade port for cascading a plurality of strip-shaped sensors and an output end for outputting detection results; The photosensitive circuit module further comprises a connector 1 and a connector 2, a VREF line for providing the brightness threshold setting voltage is connected between the connector 1 and the connector 2, an SCLK line for providing a clock signal to the shift register is further connected, and a LOAD line for providing parallel input loading to the shift register is further connected; the serial signal output SOUT of the shift register is connected to the connector 1, and the serial signal input SIN for connecting the serial signal output of the previous module is connected to the connector 2; through the paired connection of the connector 1 and the connector 2, a plurality of photosensitive circuit modules are cascaded according to the height of the granary.

2. The method of claim 1, wherein, The VCC line for supplying power to each photosensitive device is connected between the connector 1 and the connector 2, and the GND line for providing a ground signal is further connected.

3. The method of claim 1, wherein, At least one light source is further included, and the light source is arranged on the top of the granary and faces one side of the photosensitive device.

4. The method of claim 1, wherein, The strip-shaped sensor is vertically arranged in the middle of the granary.

5. The method of claim 1, wherein, The photosensitive devices are equally spaced on the strip-shaped sensor.

6. A farm machinery barn characterized by The granary body and a signal processor are included, the strip-shaped sensor is vertically arranged in the granary body, the strip-shaped sensor comprises a photosensitive circuit module, the photosensitive circuit module comprises a shift register and a plurality of photosensitive circuits; each photosensitive circuit comprises a photosensitive device for acquiring ambient brightness; the signal processor is used for outputting the height corresponding to the photosensitive device as the material level height if it is read that the ambient brightness of a certain photosensitive device changes, and the ambient brightness detected by the photosensitive devices below the photosensitive device are all lower than a preset brightness threshold; In the same photosensitive circuit module, the output end of the photosensitive device is connected to one input end of a comparator after being grounded through a load resistor, and a brightness threshold setting voltage is provided to the other input end of the comparator; the output end of the comparator is connected to the shift register, and the shift register comprises a cascade port for cascading a plurality of strip-shaped sensors and an output end for outputting detection results; The photosensitive circuit module further comprises a connector 1 and a connector 2, and a VREF line for providing the brightness threshold setting voltage is connected between the connector 1 and the connector 2, and an SCLK line for providing a clock signal to the shift register is also connected, and a LOAD line for providing parallel input loading to the shift register is also connected; a serial signal output SOUT of the shift register is connected to the connector 1, and a serial signal input SIN for connecting the serial signal output of the previous stage module is connected to the connector 2; through the paired connection of the connector 1 and the connector 2, multiple photosensitive circuit modules are cascaded according to the height of the granary.

7. The farm silo of claim 6, wherein, A VCC line for supplying power to each photosensitive device is connected between the connector 1 and the connector 2, and a GND line for providing a ground signal is also connected.

8. The farm silo of claim 6, wherein, Further comprising at least one light source, which is arranged on the top of the granary and faces one side of the photosensitive device.

9. The farm silo of claim 6, wherein, The strip-shaped sensor is vertically arranged in the middle of the interior of the granary.

10. The farm silo of claim 6, wherein, The photosensitive devices are equally spaced on the strip-shaped sensor. The photosensitive devices are equally spaced on the strip-shaped sensor.

Images