| Factory rice seedling raising is a key link in the mechanized production process of rice,and the precision seeding device is an important part of the rice seedling raising production line.The seeding amount of the seedling tray is an important indicator to measure the consistency of the seeding of the rice seedling raising production line.The important basis of inspection,the quality of its performance,directly affects the quality of seedling raising.The metering amount of the rice seedling production line of the existing rice seedling production line is mainly calibrated in advance by manual methods.It is manually monitored during work and corrected by manual observation when changes occur.Not only is the labor intensity high,it is easy to cause worker fatigue,and the adjustment is not timely and error The high rate restricts the production efficiency of the factory seedling raising production line.Therefore,in order to improve the degree of automation and operating efficiency of the rice seedling raising and seeding production line and reduce the labor level,it is necessary to conduct research on the device for detecting the seeding amount of the seedling tray of the rice seedling raising and production line,timely forecast the seeding amount and adjust it,and improve the quality of seedling raising.In this paper,on the basis of collating and analyzing the current development status of seeding amount detection devices and weighing devices at home and abroad,the research on the seeding amount weighing device of the rice seedling production line is carried out.Developed dynamic weighing and dynamic-static combined weighing devices for the seedling amount of the rice seedling production line,and carried out experimental studies separately.It was obtained that both devices can effectively improve the automation degree and production efficiency of the rice seedling production line.The main contents and conclusions of this article are as follows:(1)The overall scheme of the dynamic weighing and dynamic-static combined weighing device for constructing the seedling amount of the rice seedling raising production line was constructed.Based on the dynamic analysis of the weighing mechanism and the structural characteristics of the seedling production line,two weighing devices were constructed.One is to determine the metering scheme of the seedling tray and dynamic weighing before and after the acceleration mechanism of the conveying mechanism,which is called the dynamic weighing device;the other is to determine the metering of the seedling tray,static weighing and dynamic conveying static weighing before and after accelerated separation The scheme is called dynamic and static combined weighing device.The weighing mechanism designed to be installed before and after the sowing mechanism of the seedling raising production line is designed to weigh the sowing amount of the seedling tray by comparing the difference between the weight of the seedling tray before and after sowing.The structural characteristics of the two schemes are that the dynamic weighing device only needs to change part of the transmission of the factory seedling raising production line,and does not affect the structure of the whole machine.The combination of dynamic and static weighing devices will change the length of the whole machine in addition to part of the transmission,which requires further analysis.The measurement accuracy and reliability of the two principles.(2)Design of key components of dynamic weighing and dynamic-static combined weighing device of rice tray seeding production line.According to the analysis of continuous weighing motion,dynamic and dynamic static conveying models were established,and different roller-type conveying mechanisms were developed;combined with the roller conveying mechanism,resistance strain-type weighing sensors were used to develop dynamic weighing mechanisms and dynamic and static Combine weighing mechanism.The STM32F4 single-chip microcomputer is designed as the controller of two devices,the sensors are optimized,the control flow of the system is determined,and the preparation of the main program and interactive interface program is completed.(3)Optimization of dynamic weighing algorithm for seeding amount of rice seedlings in rice seedling production line and experimental study on performance of dynamic weighing device.By analyzing the dynamic weighing technology and the detection error of the weighing system,the Butterworth low-pass filter,Kalman filter and arithmetic average filter are used to analyze the filtering effect of each filtering algorithm on the interference signal through MATLAB simulation Kalman filter algorithm.Based on the determination of the key technical parameters of the dynamic weighing device,a prototype of the principle of the dynamic weighing device was developed.Using productivity and seeding rate as test factors and weighing accuracy as indicators,a dynamic weighing device test based on Kalman filter algorithm was conducted.The test results show that the sowing amount has the most significant influence on the dynamic weighing accuracy,and the productivity has a certain influence on the dynamic weighing accuracy.The weighing accuracy is low at low sowing amount(40g ～ 80g),and the weighing accuracy range was 87.92% ～ 91.71 %,The average weighing accuracy was 90.13%,and the weighing accuracy is high at a large broadcast volume(100g ～ 120g),the weighing accuracy range was 92.03% ～ 95.85%,and the average weighing accuracy was 93.65%.It can be seen that when the seedling raising amount is low,the accuracy is poor,and it is not suitable for metering;for example,when the seedling raising amount is high,this method can be used when the accuracy requirement is not high,to avoid making the seedling raising machine structure larger improve.(4)Experimental research on the performance of the dynamic and static combined seeding device of the rice seedling production line and the weighing device.Through theoretical analysis,the key technical parameters of the combined dynamic and static weighing device were determined.Based on the process principle of the combined dynamic and static weighing method,the prototype of the combined dynamic and static weighing device principle was developed to achieve the combined dynamic and static weighing;with productivity and seeding rate as test factors,Weighing accuracy is the test index.Prototype test of dynamic and static combined weighing device is carried out;the test results show that the seeding amount has a certain effect on the dynamic and static combined weighing accuracy,and the productivity has little effect on the dynamic and static combined weighing accuracy,and the low seeding rate(40g ～ 80g),the weighing accuracy range was 99.27% ～99.98%,and the average weighing accuracy was 99.79%;when the broadcast volume is large(100g ～ 120g),the weighing accuracy range was 99.72% ～ 100%,and the average weighing accuracy was 99.92%.It can be seen that the dynamic and static combined weighing device has a higher weighing accuracy.The average weighing accuracy was as high as 99.7%,and the weighing error was ≤ ± 0.00075 kg,which achieves the high-precision weighing standard.Metering device for weighing the seedling raising amount of seedling tray. |
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