Impulse type yield measuring device, harvester and impulse type yield measuring method

Abstract

The present invention relates to the field of precision agriculture technology, and specifically discloses an impulse-type yield measuring device, a harvester, and an impulse-type yield measuring method. The impulse-type yield measuring device is installed at the grain unloading port of a grain unloading barrel, and includes an outer shell, an impulse plate, and a pressure sensor; the outer shell encloses a yield measuring chamber, the yield measuring chamber is provided with a relative assembly surface and a baffle surface, the assembly surface is provided with a receiving port, the grain unloading barrel is connected to the yield measuring chamber through the receiving port, and the bottom end of the yield measuring chamber is provided with a discharge port for discharge; the impulse plate and the pressure sensor are both arranged in the yield measuring chamber, the impulse plate is parallel to the assembly surface, the fixed end of the pressure sensor is fixedly connected to the baffle surface, and the weighing end of the pressure sensor is fixedly connected to the connecting surface of the impulse plate. The impulse-type yield measuring device realizes direct measurement of the impact force caused to grain by setting an impulse plate. The above design reduces the assembly difficulty of the impulse-type yield measuring device, improves the disassembly and assembly efficiency, and completes the accurate weighing of grain quality.

Description

Technical Field

[0001] The present invention relates to the technical field of precision agriculture, and in particular to an impulse-type yield measurement device, a harvester and an impulse-type yield measurement method. Background Art

[0002] Precision agriculture has always been a technology with great research value. Accurately obtaining land grain yields helps to improve land information and guide subsequent agricultural production.

[0003] Most of the existing harvesters cannot measure the weight of harvested grain. Harvesters working in the field need to unload the grain onto a loading truck, which then transports it to a grain loading center for weighing. This solution has low weighing efficiency and can only measure the weight of the grain loaded on the loading truck each time, and cannot accurately understand the yield of a single field of the user. In addition, a small number of harvesters are equipped with the function of measuring the weight of harvested grain when they leave the factory. They weigh the grain in the entire granary by installing weighing sensors at the bottom and sides of the granary, which is equivalent to using weighing sensors to suspend the entire granary for weighing. The structure is complex and the bumps and vibrations of the harvester during operation have a great impact on the measured value of the weighing sensor, affecting the measurement accuracy. If you want to modify the harvesters on the market to add a weighing function, the current solution requires a lot of manpower and material resources, and the cost is very high, which is difficult for farmers to accept. Therefore, this solution has not been popularized. Summary of the invention

[0004] The purpose of the present invention is to provide an impulse-type yield measurement device, a harvester, and an impulse-type yield measurement method. The installation position is adjusted, and the device is installed at the auger of the grain unloading barrel. Since the harvester grain unloading barrel is exposed to the outside, and the impulse-type yield measurement device has a simple structure, it can be quickly installed or retrofitted. The grain unloading barrels of the harvesters have a high degree of structural similarity, and the device has good versatility. Therefore, most harvesters on the market that cannot measure the weight of harvested grain can be empowered with low production and installation costs, and the market value is very large. The yield measurement method is improved, and an impulse plate is installed at the auger outlet to reduce the impact of the bumpy vibration of the harvester on the yield measurement accuracy, ensure accurate weighing of the grain quality of the entire granary, and avoid the device being installed in the granary to affect space utilization.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An impulse-type yield measuring device is installed at the grain unloading port of a grain unloading drum, and comprises an outer shell, an impulse plate and a pressure sensor. The outer shell encloses a yield measuring cavity, and the yield measuring cavity is provided with a relative assembly surface and a baffle surface. The assembly surface is provided with a receiving port, and the grain unloading drum is connected with the yield measuring cavity through the receiving port. The bottom end of the yield measuring cavity is provided with a discharge port for discharge; the impulse plate and the pressure sensor are both arranged in the yield measuring cavity, the impulse plate is parallel to the assembly surface, the fixed end of the pressure sensor is fixedly connected to the baffle surface, and the weighing end of the pressure sensor is fixedly connected to the connecting surface of the impulse plate.

[0007] As a preferred technical solution of the impulse-type production measurement device, the impulse plate is provided with a coating surface opposite to the connecting surface, and the coating surface is provided with a buffer layer.

[0008] As a preferred technical solution of the impulse production measurement device, the buffer layer is formed by spraying rubber and plastic materials.

[0009] As a preferred technical solution of the impulse production measurement device, a padding block is sandwiched between the fixed end and the baffle surface, and the locking assembly passes through the outer shell and the padding block and is fixed to the pressure sensor.

[0010] As a preferred technical solution for the impulse production measurement device, a padding block is sandwiched between the weighing end and the impulse plate, and a locking assembly passes through the impulse plate and the padding block and is fixed to the pressure sensor.

[0011] As a preferred technical solution of the impulse-type production measurement device, the edge of the impulse plate is gap-matched with the inner wall of the production measurement cavity.

[0012] As a preferred technical solution of the impulse-type production measurement device, the impulse-type production measurement device further includes a signal processor, which is communicatively connected to the pressure sensor and is used to receive and analyze data from the pressure sensor.

[0013] A harvester includes a grain bin, a fuselage, a grain unloading drum and the above-mentioned impulse-type yield measuring device, wherein the grain unloading port is located at one end of the grain unloading drum, and the other end of the grain unloading drum is connected to the grain bin. The grain bin can collect the grain in the fuselage and transport the grain to the impulse-type yield measuring device through the grain unloading drum.

[0014] As an optimal technical solution for the harvester, the grain unloading barrel includes a grain unloading barrel wall, in which is provided an auger body for transporting the grain and an auger shaft for driving the auger body to rotate, the auger shaft extends into the yield measuring chamber and is rotatably connected to the baffle surface, and the impulse plate avoids the auger shaft.

[0015] The impulse production measurement method is applied to the above-mentioned impulse production measurement device, comprising the following steps:

[0016] S10: Calculating the impact force received by the impulse plate throughout the entire process through the collected values ​​of the pressure sensor;

[0017] S20: Calculate the linear velocity of grain at the grain unloading drum;

[0018] S30: Integrate the grain masses at all moments during the entire harvesting period to finally obtain the total grain mass.

[0019] Beneficial effects of the present invention:

[0020] The impulse type yield measuring device uses the design of an impulse plate connected to a pressure sensor to determine the relative position of the impulse plate and the grain unloading barrel passing through the receiving port, so that the grain entering the yield measuring cavity can smoothly impact the impulse plate according to a predetermined trajectory, thereby realizing the pressure sensor to collect force data. By analyzing and calculating the force data, the grain quality can be accurately weighed. The above structure has the advantages of high precision, small space occupation and compact structure, and can stably complete the weighing operation of grain quality for a long time. The design of assembly is realized by the cooperation of the receiving port and the grain unloading barrel, which reduces the difficulty of disassembly and assembly of the impulse type yield measuring device on the grain unloading barrel, facilitates the later installation of the impulse type yield measuring device on the conventional grain unloading barrel, and significantly improves the versatility of the impulse type yield measuring device. The design of assembling the impulse type yield measuring device directly on the grain unloading barrel can also make full use of the space in the granary. Because the grain unloading barrel of the harvester is directly exposed to the outside and has a simple structure, and there are many types and models of harvesters, but the grain unloading barrel has a high degree of structural similarity, most harvesters on the market that cannot measure the weight of harvested grain can quickly install the impulse yield measuring device provided by this embodiment to achieve the measurement of harvested grain yield. The device is easy to install and the cost is extremely low, and the market value is very large. In addition, when the impulse yield measuring device calibrates the data, it can directly pour grain of known mass into the granary, and the grain unloading barrel can be opened to unload the grain to obtain the measurement data and analyze and calibrate it. The grain remaining in the granary is almost a constant value, so the convenience and accuracy of data calibration are very high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an impulse-type yield measuring device and a part of a grain unloading drum provided in an embodiment of the present invention;

[0022] Figure 2 It is a cross-sectional view of an impulse-type yield measuring device and a part of a grain unloading drum provided in an embodiment of the present invention;

[0023] Figure 3 is a partial exploded view of an impulse-type production measurement device provided in an embodiment of the present invention;

[0024] Figure 4is a schematic structural diagram of a harvester provided by an embodiment of the present invention;

[0025] Figure 5 It is a formula derivation diagram of the impulse production measurement method provided in an embodiment of the present invention.

[0026] In the figure:

[0027] 100. impulse-type production measuring device; 110. locking assembly; 120. spacer block; 130. pressure sensor; 140. impulse plate; 150. baffle surface; 160. auger shaft; 170. auger body; 180. grain unloading drum wall; 200. grain silo; 300. fuselage; 400. grain unloading drum. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] like Figure 1-Figure 4 As shown, this embodiment provides an impulse-type yield measuring device 100, which is installed at the grain unloading port of the grain unloading barrel 400, and includes an outer shell, an impulse plate 140 and a pressure sensor 130; the outer shell encloses a yield measuring cavity, and the yield measuring cavity is provided with a relative assembly surface and a baffle surface 150, and the assembly surface is provided with a receiving port, and the grain unloading barrel 400 is connected with the yield measuring cavity through the receiving port, and the bottom end of the yield measuring cavity is provided with a discharge port for discharge; the impulse plate 140 and the pressure sensor 130 are both arranged in the yield measuring cavity, the impulse plate 140 is parallel to the assembly surface, the fixed end of the pressure sensor 130 is fixedly connected to the baffle surface 150, and the weighing end of the pressure sensor 130 is fixedly connected to the connecting surface of the impulse plate 140.

[0033] The impulse type yield measuring device 100 uses the design of the impulse plate 140 connected to the pressure sensor 130 to determine the relative position of the impulse plate 140 and the grain unloading barrel 400 passing through the receiving port, so that the grain entering the yield measuring chamber can smoothly impact the impulse plate 140 according to the predetermined trajectory, thereby realizing the collection of force data by the pressure sensor 130. By analyzing and calculating the force data, the grain quality can be accurately weighed. The above structure has the advantages of high precision, small space occupation and compact structure, and can stably complete the weighing operation of grain quality for a long time. The design of assembly is realized by the cooperation of the receiving port and the grain unloading barrel 400, which reduces the difficulty of disassembly and assembly of the impulse type yield measuring device 100 on the grain unloading barrel 400, facilitates the later installation of the impulse type yield measuring device 100 on the conventional grain unloading barrel 400, and also significantly improves the versatility of the impulse type yield measuring device 100. The design of assembling the impulse type yield measuring device 100 directly on the grain discharge barrel 400 can also make full use of the space in the granary 200. Because the grain discharge barrel 400 of the harvester is directly exposed to the outside, the structure is simple, and there are many types and models of harvesters, but the grain discharge barrel 400 has a high structural similarity. Therefore, most harvesters on the market that cannot measure the weight of harvested grain can quickly install the impulse type yield measuring device 100 provided by this embodiment to achieve the measurement of the harvested grain yield. The device is easy to install and the cost is extremely low, and the market value is very large. In addition, when the impulse type yield measuring device 100 calibrates the data, it can directly pour grain of known mass into the granary 200, and the grain discharge barrel 400 can be opened to discharge the grain to obtain the measurement data and analyze and calibrate it. The grain remaining in the granary 200 is almost a constant value, so the convenience and accuracy of data calibration are very high.

[0034] During the production measurement operation, the fixed end is stationary relative to the grain unloading drum 400, and the pressure transmitted through the impulse plate 140 acts on the weighing end, causing the pressure sensor 130 to undergo a slight deformation similar to the bending of a cantilever beam. The center of the pressure sensor 130 integrates a strain gauge group for detecting the pressure and transmitting the detection signal to other devices through the signal line at the top of the fixed end.

[0035] At the same time, the above design, by installing the impulse type yield measuring device 100 at the grain discharge port of the grain discharge barrel 400, does not require the operator to climb up the grain bin 200 of the harvester for installation. The above design has a simple structure and reduces the difficulty of disassembly and assembly. The impulse type yield measuring device 100 has a small number of structural parts and is easy to install separately. It has low requirements on the proficiency of the operator. The installation process is time-saving and efficient, and it is not easy to make mistakes, which is suitable for mass promotion and application.

[0036] In addition, the existing harvesters include semi-feeding, full-feeding, paddy field and dry field types, and the sizes and structures of the grain bins 200 are different, which makes the installation structure of the impulse type equipment installed in the grain bin 200 complicated, and it is impossible to achieve fast and universal installation of different models. The impulse type yield measuring device 100 provided in this embodiment is set on the grain discharge port, and does not need to be adapted to the size of the grain bin 200, thereby expanding the scope of application of the impulse type yield measuring device 100.

[0037] Exemplarily, the fixed end is connected to the bottom of the baffle surface 150, and the weighing end is connected to the middle of the connection surface. The design of the fixed end being connected to the bottom of the baffle surface 150 optimizes the stress condition of the pressure sensor 130 and reduces the risk of positional displacement of the pressure sensor 130; the design of the weighing end being connected to the middle of the connection surface ensures uniform stress at various locations on the impulse plate 140 and ensures the accuracy of the measurement results of the pressure sensor 130. The above structural layout makes the pressure sensor 130 a single-point cantilever structure. During installation, the pressure sensor 130 is installed vertically, with the fixed end at the bottom and the weighing end at the top, and the force direction points to the baffle surface 150.

[0038] In this embodiment, the impulse plate 140 is provided with a coating surface opposite to the connection surface, and the coating surface is provided with a buffer layer. The provision of the buffer layer effectively alleviates the vibration of the impulse plate 140 caused by impact, reduces the influence of unexpected factors on the measurement results, and also reduces the damage of the impulse plate 140 to the grain when impacted.

[0039] Furthermore, the buffer layer is formed by spraying rubber and plastic materials. Specifically, the rubber and plastic materials have the property of not sticking to soil, thereby reducing the adhesion of the buffer layer to soil in the grain, ensuring the cleanliness of the buffer layer, and reducing the residue of grain and soil in the impulse-type yield measurement device 100.

[0040] In this embodiment, a padding block 120 is sandwiched between the fixed end and the baffle surface 150, and the locking assembly 110 passes through the outer shell and the padding block 120 and is fixed to the pressure sensor 130; a padding block 120 is sandwiched between the weighing end and the impulse plate 140, and the locking assembly 110 passes through the impulse plate 140 and the padding block 120 and is fixed to the pressure sensor 130.

[0041] The pad block 120 provided between the pressure sensor 130 and the baffle surface 150 can prevent the pressure sensor 130 from being deformed too much and touching the baffle surface 150, thereby reducing the risk of food being stuck due to the small gap between the pressure sensor 130 and the baffle surface 150; the pad block 120 provided between the impulse plate 140 and the pressure sensor 130 can prevent the impulse plate 140 from being deformed too much and touching the pressure sensor 130. The above design reduces the probability of deformation of each component, reduces the risk of food being stuffed into the gap between components, and reduces the risk of interference with the measurement result of the pressure sensor 130.

[0042] Specifically, the locking assembly 110 includes at least two locking bolts, the locking bolts pass through the outer shell and the pad block 120 and are screwed to the pressure sensor 130, and the locking bolts pass through the impulse plate 140 and the pad block 120 and are screwed to the pressure sensor 130. The above structure is simple and reliable, occupies a small space and has high connection stability, which ensures the smooth operation of the impulse type production measurement device 100.

[0043] In this embodiment, the heightening block 120 disposed between the pressure sensor 130 and the baffle surface 150 and the heightening block 120 disposed between the impulse plate 140 and the pressure sensor 130 have the same size specifications, and two through holes are passed through the middle of the heightening block 120 for passing the locking bolts. The size specifications of the locking bolts are consistent, and the above design can reduce the types of components, reduce the probability of errors in manufacturing and installation, and improve production efficiency.

[0044] During assembly, the locking bolts are first used to pass through the impulse plate 140 and a spacer block 120 in sequence, and screwed into the weighing end of the pressure sensor 130. Then, the locking bolts are used to pass through the baffle surface 150 and another spacer block 120 in sequence, and screwed into the fixed end of the pressure sensor 130. The installation process is convenient and quick.

[0045] Exemplarily, the outer edge of the impulse plate 140 is matched with the inner wall clearance of the production measurement chamber, and the inner edge is matched with the outer diameter clearance of the auger shaft 160. Specifically, the outer dimensions of the impulse plate 140 match the shape of the inner wall of the production measurement chamber. The above design enables the impulse plate 140 to obtain more grain impact, reduces the probability that the impact generated by the grain is not received by the impulse plate 140, and improves the accuracy of the measurement result. In order to fill the gap of the impulse plate 140 above the auger shaft 160, the impulse plate 140 can be designed as a left-right symmetrical split type. When installing, the left and right impulse plates 140 are put on the auger shaft 160 and then fixed to each other. However, through experimental determination, the grain ejected from the auger body 170 is a parabolic trajectory, and the proportion of grain passing through the gap of the impulse plate 140 above the auger shaft 160 is very small, and the proportion is stable, so the total mass can be converted by the mass measured by the impulse plate 140 and the proportion. In this example solution, under the premise of being able to stably measure the weight of grain, the impulse plate 140 has a simpler structure and is easier to install, so other solutions will not be elaborated in more detail.

[0046] In this embodiment, the impulse production measurement device 100 further includes a signal processor, which is communicatively connected to the pressure sensor 130 and is used to receive and analyze data from the pressure sensor 130. The signal processor processes the data from the pressure sensor 130, can filter valid data and display it on the display panel, thereby intuitively presenting the results to the user through the display panel.

[0047] The present embodiment also provides a harvester, including a grain bin 200, a fuselage 300, a grain unloading drum 400 and the above-mentioned impulse-type yield measuring device 100. The grain unloading port is located at one end of the grain unloading drum 400, and the other end of the grain unloading drum 400 is connected to the grain bin 200. The grain bin 200 can collect the grain in the fuselage 300 and transport the grain to the impulse-type yield measuring device 100 through the grain unloading drum 400.

[0048] The harvester has a simple and reliable structure, can quickly complete the disassembly and assembly operations of the impulse-type yield measuring device 100, and ensures that the yield measuring operation of the grain in the granary 200 can be completed smoothly.

[0049] In this embodiment, when the harvester is harvesting, grain is transported from the body 300 to the granary 200. During this process, the harvester is in a state of severe vibration or bumping. In order to ensure the accuracy of the data detected by the yield measuring device, the impulse yield measuring device 100 does not work at this time. After the harvested grain is full and the alarm is sounded, the body 300 of the harvester stops the harvesting action and starts to unload the grain. The grain in the granary 200 is transported to the grain unloading port through the grain unloading barrel 400 to complete the grain unloading work. When unloading grain, the harvester in a relatively static state greatly reduces the impact of bumping vibration on the measurement accuracy, thereby ensuring the accuracy of the impulse yield measuring device 100.

[0050] In this embodiment, the grain unloading barrel 400 includes a grain unloading barrel wall 180, in which an auger body 170 for transporting grain and an auger shaft 160 for driving the auger body 170 to rotate are arranged, the auger shaft 160 extends into the production measurement chamber and is rotatably connected to the baffle surface 150, and the impulse plate 140 avoids the auger shaft 160. Specifically, the auger shaft 160 is coaxial with the grain unloading barrel wall 180; the auger body 170 is circumferentially welded to the side of the auger shaft 160. The above structure is simple and reliable, and can smoothly transport the grain in the granary 200 to the grain unloading port, so that the grain with an initial velocity can be ejected onto the impulse plate 140 according to a predetermined trajectory.

[0051] For example, the part of the auger shaft 160 placed in the yield measurement chamber is not provided with the auger body 170. The above design makes it possible for the grain to no longer be pushed by the auger body 170 after reaching the grain discharge port, and to leave the grain discharge barrel 400 from the grain discharge port. The above design avoids the situation where the grain entering the yield measurement chamber continues to be pushed, simplifies the movement track of the grain in the yield measurement chamber, and ensures that the grain can smoothly impact the impulse plate 140 and then be discharged from the discharge port.

[0052] The upper part of the impulse plate 140 is semicircular and has a central groove. The above structure enables the impulse plate 140 to avoid the auger shaft 160 of the harvester, simplifies the structure of the harvester, and expands the area of ​​the coating surface as much as possible. The lower part of the impulse plate 140 is rectangular and close to the inner wall size of the yield measurement chamber, thereby minimizing the gap between the impulse plate 140 and the inner wall of the yield measurement chamber, further reducing the probability that the impact generated by the grain is not received by the impulse plate 140.

[0053] In this embodiment, the signal processor is installed in the cab of the harvester.

[0054] like Figure 1-Figure 5 As shown, this embodiment also provides an impulse yield measurement method, which is applied to the above-mentioned impulse yield measurement device 100 and includes the following steps:

[0055] Step 1: Calculate the impact force received by the impulse plate 140 throughout the entire process through the collected values ​​of the pressure sensor 130 .

[0056] Step 2: Calculate the linear velocity of grain at the grain unloading drum 400.

[0057] Step 3: Integrate the mass of grain at all moments during the entire harvesting period to finally obtain the total mass of grain.

[0058] Among them, step one includes the following detailed steps: calibrating the pressure sensor 130 in the laboratory to obtain a standard voltage value corresponding to each kilogram of grain mass; then periodically collecting the voltage value of the pressure sensor 130, and calculating the grain mass at that moment based on the voltage value obtained at a certain time point, and calculating the impact force corresponding to the grain mass at this time.

[0059] The impulse yield measurement method can calculate the total mass of grain based on the data obtained by the pressure sensor 130. The calculation method is simple and accurate, and the weighing result can be calculated smoothly.

[0060] In this embodiment, the impact force F needs to be calculated first. The ratio of the impact caused by 1 kg to the voltage value returned by the pressure sensor is defined as the calibration value K. The calibration method of the sensor is common knowledge in this field and will not be elaborated here. The harvester is provided with a controller, which is used to periodically collect the voltage value of the pressure sensor 130. After obtaining the voltage value vol at a certain time point, the grain mass m at that moment can be calculated by the calibration value K. With the help of the formula F=ma, the impact force F corresponding to the grain mass at this time can be calculated (since the calibration of the pressure sensor in the laboratory is obtained by the gravity acceleration g, the a in the formula can also be directly replaced by the gravity acceleration g). The formula is:

[0061] F=mg=vol / K×g

[0062] The sensor will have a certain basic value during use. In order to reduce the error, calibration is required. There are two methods for sensor calibration:

[0063] 1) Fix the fixed end of the sensor to a plane, leave the middle of the sensor and the weighing end suspended, measure the voltage value V0 in this state, place a standard 1kg weight horizontally at the weighing end, measure the voltage value V1 output by the sensor, and use (V1-V0) / 1kg as the calibration value K.

[0064] 2) Fix the fixed end of the sensor on a vertical plane, leave the middle of the sensor and the weighing end suspended, measure the voltage value V0 in this state, hang a dynamometer through the hole at the weighing end, apply a force of 1kg vertically to the weighing end, measure the voltage value V1 output by the sensor, and use (V1-V0) / 1kg as the calibration value K.

[0065] After that, the grain linear velocity v needs to be calculated. The speed when the grain hits the impulse plate 140 is the grain linear velocity v, which is determined by the rotation speed of the auger body 170 of the harvester, the radius of the auger body 170, and the distance between the impulse plate 140 and the scraper on the grain unloading barrel 400. Finally, the grain linear velocity v is calculated by the synthesized centripetal force velocity. The formula is:

[0066] v=60 / n×2×Π×(r+l)×√2

[0067] Among them, Π is a variable that may introduce errors, n is the rotation speed of the auger body 170, r is the radius of the auger body 170, and l is the distance between the scraper and the impulse plate 140.

[0068] In this embodiment, there are several ways to obtain the rotation speed n of the auger body 170:

[0069] 1) Directly read the display value of the display panel;

[0070] 2) Use the video recording method to analyze the actual speed and the speed displayed by the instrument frame by frame;

[0071] 3) Obtain accurate speed value by adding a speed sensor.

[0072] In this embodiment, the radius of the auger body 170 is an actually measured constant value, which may be different for different specifications and models. It can be measured before leaving the factory and input into the measurement device formula for storage.

[0073] In this embodiment, the distance between the impulse plate 140 and the scraper on the grain unloading drum 400 can be directly measured after the device is installed, and the value can be input into the formula of the measuring device for storage.

[0074] Finally, the total weight M needs to be calculated. According to the formula Ft = mv, the weight of the grain at the moment can be calculated; the entire time period is divided into a small time period δ, and the grain weight m is integrated during the entire harvesting time period, and the total weight M of the grain will be obtained in the end.

[0075] The derivation formula is:

[0076]

[0077] However, the above formula is an ideal case. In the actual measurement process, the measurement is discrete, so it is necessary to assume that the force is uniform in each small time period, that is, the force at each small time period δ is taken as the average force of the time period, and the following actual calculation formula can be derived:

[0078]

[0079] At this time, the value of δ is the time interval of each collection, a is the number of sampling times in the time period to be measured, and δ = 100 milliseconds in this measurement model. Theoretically, when the sampling frequency is fast enough, the error can be minimized to the greatest extent, and finally the total weight M in the required time period is calculated by summing up.

[0080] From the above, it can be seen that there are errors in the derivation process, which can be reduced by adding the whole bin calibration. The whole bin calibration process is as follows: feed the harvester with a known weight M1 for a period of time, simulate harvesting on site, calculate the weight M2 through the above theory, and use M1 / M2 as the error factor K1.

[0081] Finally, the following formula is obtained:

[0082]

[0083] It can be seen from the above formula that most of the errors in the experiment come from the obtained voltage value. Possible reasons include different models, different grain crops, temperature and humidity, the accuracy of the pressure sensor, the vibration of the harvester, the distance between the auger and the scraper of different models, etc. The error parameters can be eliminated by fixing a model and fixing the grain weight. The speed of the auger body is also a factor that needs to be paid attention to during the harvesting process. For example, when the harvester is unloading grain, the throttle will not be fixed, but will increase after a period of time. This will interfere with the recording of the overall unloading time. The proportional coefficient can be added to eliminate the error by recording how long it takes for the throttle to increase after the unloading starts.

[0084] This embodiment analyzes how to select pressure sensors with different ranges, static test methods, dynamic test methods, and data errors. It is concluded that coordinated unloading of grain during harvesting will indeed interfere with later data. The specific experimental methods and experimental data are not described in detail here.

[0085] There are many possible reasons for the errors in experimental data, such as the large differences in temperature and humidity at different times, the large randomness of artificially recorded time points, and the uncertainty of artificially selected points in subsequent data analysis, etc. Through the above method, we can check the influencing factors one by one, and I will not go into details here.

[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A harvester, characterized in that: The invention comprises a grain bin (200), a machine body (300), a grain unloading barrel (400) and an impulse-type yield measuring device, wherein a grain unloading port is located at one end of the grain unloading barrel (400), and the other end of the grain unloading barrel (400) is connected to the grain bin (200), and the grain bin (200) is capable of collecting grain in the machine body (300) and conveying the grain to the impulse-type yield measuring device through the grain unloading barrel (400), wherein the impulse-type yield measuring device is installed at the grain unloading port of the grain unloading barrel (400), and the impulse-type yield measuring device comprises: The outer shell encloses a production measurement cavity, the production measurement cavity is provided with an assembly surface and a baffle surface (150) facing each other, the assembly surface is provided with a receiving opening, the grain unloading barrel (400) is connected with the production measurement cavity through the receiving opening, and the bottom end of the production measurement cavity is provided with a discharge port for discharge; The impulse plate (140) and the pressure sensor (130) are both arranged in the production measurement cavity, the impulse plate (140) is parallel to the assembly surface, the fixed end of the pressure sensor (130) is fixedly connected to the bottom of the baffle surface (150), and the weighing end of the pressure sensor (130) is fixedly connected to the middle of the connection surface of the impulse plate (140); The impulse plate (140) is provided with a coating surface opposite to the connection surface, and the coating surface is provided with a buffer layer.

2. The harvester according to claim 1, characterized in that: The buffer layer is formed by spraying rubber and plastic materials.

3. The harvester according to claim 1, characterized in that: A padding block (120) is sandwiched between the fixed end and the baffle surface (150); the locking assembly (110) passes through the outer shell and the padding block (120) and is fixed to the pressure sensor (130).

4. The harvester according to claim 1, characterized in that: A padding block (120) is sandwiched between the weighing end and the impulse plate (140), and a locking assembly (110) passes through the impulse plate (140) and the padding block (120) and is fixed to the pressure sensor (130).

5. The harvester according to claim 1, characterized in that: The edge of the impulse plate (140) is clearance-matched with the inner wall of the production measurement cavity.

6. The harvester according to any one of claims 1 to 5, characterized in that: The impulse production measurement device further comprises a signal processor, the signal processor being communicatively connected to the pressure sensor (130) and being used for receiving and analyzing data from the pressure sensor (130).

7. The harvester according to claim 1, characterized in that: The grain unloading barrel (400) comprises a grain unloading barrel wall (180), wherein an auger body (170) for transporting the grain and an auger shaft (160) for driving the auger body (170) to rotate are arranged in the grain unloading barrel wall (180), wherein the auger shaft (160) extends into the production measuring chamber and is rotatably connected to the baffle surface (150), and the impulse plate (140) avoids the auger shaft (160).

8. The impulse production measurement method is characterized by: The impulse yield measuring device applied to the harvester according to any one of claims 1 to 6 comprises the following steps: S10: calculating the impact force received by the impulse plate (140) throughout the entire process through the collected value of the pressure sensor (130); S20: Calculating the linear velocity of grain at the grain unloading drum (400); S30: Integrate the grain masses at all moments during the entire harvesting period to finally obtain the total grain mass.

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