The Design and Research of the Bolt Loosening Monitoring System in Combine Harvesters Based on Wheatstone Bridge Circuit Sensor

Agriculture, Journal Year: 2025, Volume and Issue: 15(7), P. 704 - 704

Published: March 26, 2025

The combine harvester, as a multi-component machine comprising cutting table, conveyor, threshing cylinder, and other components, experiences significant stress bolt failures in table-conveyor structures due to inherent excitation the table’s cantilevered design. To address loosening monitoring critical joint, this paper designed Wheatstone bridge circuit-based wireless system multi-channel sensor, enabling multi-bolt on harvesters. Utilizing LoRa communication, effectively overcomes wiring complexity deployment difficulties of traditional agricultural machinery systems. sensor can precisely monitor pre-tightening forces up 150 kN for M12–M24 bolts. A calibration test based dynamic time warping (DTW) accurately fitted sensor’s response pressure displacement with determination coefficients 0.9780 0.9753. Then, validation focusing connection bolts revealed 95.12% overlap between simulated measurement range under conditions. Furthermore, fitting curves measurements against tightening torque angle yielded 0.9945 0.9939, which demonstrated accurate conditions defined 3.02 × 1012 3.49 1012. Finally, combined simulation results, field performance confirmed ability detect minute 5% pre-load reductions, achieve 200 ms data transmission host computer, maintain lossless over 1.2 km. This design provided valuable reference harvesters machinery.

Language: Английский

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Effects of Unbalanced Incentives on Threshing Drum Stability during Rice Threshing

Agriculture, Journal Year: 2024, Volume and Issue: 14(5), P. 777 - 777

Published: May 17, 2024

As a result of the uneven growth rice, unbalanced vibration threshing drum caused by stalk entanglement in combine harvester is more and severe. In order to reveal influence excitation on roller axis locus during rice threshing, stability was studied. The dynamic signal test analysis system are used axial trajectory drum. At same time, winding analyzed experimental results. Axis rules under no-load conditions obtained. simulate radial distribution along drum, counterweight distributed instead entangled stalk. Then, definite effect rotating analyzed. Results show that amplitude stem grain larger vertical direction smaller horizontal when compared with unloaded state 200 g weight. It found both directions decreased after 400 600 counterweights were added, respectively, barrel. Finally, it can be seen increase weight counterweight, characteristics misalignment cylinder become obvious. This study provide reference for reducing improving driving comfort.

Language: Английский

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Pneumatic conveying characteristics in the rice husk powder industry and optimization of engineering process

Process Safety and Environmental Protection, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

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Parameter optimization of the notched blade spiral fertilizer discharger for pineapple orchards based on DEM

Frontiers in Mechanical Engineering, Journal Year: 2025, Volume and Issue: 11

Published: Feb. 17, 2025

Introduction In order to improve the fertilizer-discharging uniformity of traditional spiral fertilizer distributor and achieve precise controllable fertilization, based on agronomic characteristics fertilization in pineapple orchards, a notched-blade discharger with mechanism discontinuous-blade sliding-cutting pushing-pore is innovatively designed. Methods Based parametric modelling determining volume accommodation spiral, theoretical amount determined combination analysis. The main factors influencing performance are analyzed using calculation formulas. discrete element method used simulate process. By comparing simulation experiments, it that has better than one. effects number shape periodic notched blades through single-factor experiments. L 9 (3⁴) orthogonal table adopted for conducting tests. Results test results show primary secondary influence indexes blade notch number. When sector, three notches, fluctuation coefficient discharge 27.01%. bench 27.42% when rotating speed 60r/min. experimental values consistent. Moreover, reduced by 64.86 percentage points compared under same conditions. 64.86% lower different rotational speeds, fitting curve y = 2.02 x + 23.02. Conclusion can be controlled adjusting speed. It improves accuracy application achieves goal green sustainable development industry tropics. research provide reference designing optimizing dischargers.

Language: Английский

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Optimization of Coal Mining Machine Drum Structure and Microscopic Analysis of Coal Particle Flow

Energy Science & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 18, 2025

ABSTRACT To solve the problems of low loading performance and insufficient design drum thin‐seam coal mining machine, this paper proposes an innovative coal‐guiding systematically investigates effects different designs on trajectory, flow structure, efficiency particles from both macro‐ microscopic perspectives. At macroscopic level, optimized significantly improves by adding circular arc‐shaped guide plate triangular plate. Simulation experiments show that average mass rate coal‐guided is increased 14.1%, under high load conditions 9.1%; with increase rotational speed, maximum 16.96%. changed movement direction particles, which led to a 15.85% in axial velocity structure particles. This provides new theoretical basis technical solution for improving coal‐mining has important practical significance wide application potential.

Language: Английский

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Cumin-Harvesting Mechanization of the Xinjiang Cotton–Cumin Intercropping System: Review of the Problem Status and Solutions

Agriculture, Journal Year: 2025, Volume and Issue: 15(8), P. 809 - 809

Published: April 8, 2025

Cumin (Cuminum cyminum L.) is a globally important spice crop, particularly significant in Xinjiang, China, where it extensively cultivated cotton–cumin intercropping systems. This review concentrates on the serious bottleneck hindering development of cumin industry: low level harvesting mechanization. Traditional manual methods are labor-intensive, inefficient, and result high yield losses. paper fully explores prospects challenges mechanizing accordance with particular biological characteristics plants complexity We current status research following domains: (1) traits models; (2) grain loss stalk damage patterns stripper similar crops; (3) factors influencing root–soil interaction during mechanical extraction; (4) uprooting–conveying techniques row division/plant singulation applicable to root tuber (5) cumin-threshing -cleaning technologies. highlights inadequacy grain-harvesting machinery for underscores urgent need specialized, low-loss technologies tailored cumin’s delicate nature context. Finally, we propose future directions overcome these mechanization promote sustainable industry.

Language: Английский

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Design and Testing of Film Picking–Unloading Device of Tillage Residual Film Recycling Machine Based on DEM Parameter Calibration

Agronomy, Journal Year: 2025, Volume and Issue: 15(4), P. 955 - 955

Published: April 14, 2025

The operating parameters and effect of a residual film recycling device can be predicted, the key determined based on DEM–MBD coupling simulation. obtained from parameter calibration are basis This study calibrates DEM for soil-touching components tillage machine. A film-picking model elastic tooth–soil–residual interactions was established. reliability contact verified by comparing simulation experimental angle repose soil–soil (43.6° vs. 42.42°, error 2.7%) film–residual (43° 43.7°, 1.6%) using funnel bucket methods. film–soil detachment developed, with force analysis showing an 8.1% between (0.34 N) experiment (0.37 N). Additionally, used to analyze recovery rate under teeth, yielding 2% (90%) (92%). provides optimization in components.

Language: Английский

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Analysis of the Resistance to Teeth During the Picking Process Based on DEM-MBD Coupling Simulation

Agronomy, Journal Year: 2025, Volume and Issue: 15(5), P. 1002 - 1002

Published: April 22, 2025

To improve the film-picking performance of toothed chain tillage residual film recycling machines, working parameters a device were optimized using Box–Behnken design, with rate as response parameter. The effectiveness device, along soil compaction, torque, and stress on picking teeth during process, was evaluated through DEM-MBD coupling simulations experiments. for film-lifting found to be forward speed v=1.94 m·s−1, tooth n=10.47 rad·s−1, penetration depth h=125 mm. Under these conditions, single-tooth multi-tooth devices 88% 90%, respectively, 2% error. simulation experimental values process 800 Pa, 2.72 N·m, 6.4 N, respectively. corresponding 870 2.53 6.5 errors 8%, 7%, 2%. This study provides valuable insights optimizing design machines predicting stress.

Language: Английский

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Design of a Conveyer Trough Bolt Signal Acquisition System and Bayesian Ensemble Identification Method for Working State

Agriculture, Journal Year: 2025, Volume and Issue: 15(9), P. 970 - 970

Published: April 29, 2025

Rice combine harvester conveyor troughs and their bolted connections are susceptible to vibration-induced failure due operational environmental excitations. Addressing the challenge of predicting state harvester’s trough structure prior failure, this study addresses by investigating signal analysis, system design, condition identification for these critical components. Firstly, multi-point vibration signals from were acquired analyzed in time-frequency domain. The analysis pinpointed X-direction at trough-frame connection (Point 5) as most responsive location, with RMS peaking 6.650 during header start-up (vs. 0.849 idle). Significant responses also noted Point 3 (Y-dir, 4.628) 6 (X-dir, 3.896) under certain conditions (where Z-direction minimal), identifying points that form basis assessment. Secondly, a acquisition was developed using high-performance AD7606 ADC A39C wireless technology. It features 16-bit resolution (0.00076 mm/s theoretical sensitivity), 8-channel synchronous sampling up 200 kSPS, rapid (0.8 s) data transmission. This meets demands high-frequency, high-precision monitoring structure. Finally, after comparing machine learning algorithms, Support Vector Machine chosen its superior performance. Using one-vs.-one strategy points, an model developed. Validation field confirmed high accuracy (96.9–99.7%) principal states low misclassification rates (<5%). allows precise structure’s working status. research presented offers effective methodologies technical underpinning structural components rice harvesters.

Language: Английский

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Response Prediction and Experimental Validation of Vibration Noise in the Conveyor Trough of a Combine Harvester

Agriculture, Journal Year: 2025, Volume and Issue: 15(10), P. 1099 - 1099

Published: May 19, 2025

The noise generated by combine harvesters during operation has drawn growing attention, particularly that of the conveying trough shell, whose generation mechanism remains unclear. This study investigated vibration radiation characteristics troughs analyzing a chain system with 83 links using numerical simulation and experimental validation. A dynamic model conveyor was developed, time domain reaction force at bearing support used as excitation for shell’s finite element model. Modal harmonic response analyses were performed to obtain response, which served an acoustic boundary input LMS Virtual Lab. indirect method compute radiated noise, achieving coupled modeling shell noise. Simulation results revealed maximum occurred approximately 112 Hz, closely matching data. Comparative analysis transmitted 500 Hz 700 showed power levels 98.4 dB 109.52 dB, respectively. Results indicate dominates over structural in energy contribution, highlighting it primary path. work offers validated prediction supports control design harvester troughs.

Language: Английский

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