Study On The Security Of The Single Wheel Paddy Field Cultivator

The paddy field cultivator plays an important role in the process of production mechanization in southern China, the TieNiu once-renowned reputation in all of the Hunan, the advantages for the realization of mechanized farming instead of the manpower, animal farming, high efficiency, low consumption and low cost has established its historical status, because of its light weight, simple operation, low cost, the higher benefit features, welcomed by the vast number of farmers. But in recent years there have been a series of safety accidents with single wheel paddy field cultivator, have caused serious effects on the agriculture produces, especially has caused the safety harm to the people, caused the government takes seriously, Because the structure of the original cultivator existing design flaws and the illegal operations in the using process and other reasons has led to the frequent occurrence of the existing accident, based on the existing cultivator safety accidents occurring phenomenon and characteristics to give a thorough investigation, find out the main reason and the occurring mechanism, the result shows that the safety accidents is mainly single wheel cultivator, mainly due to the unreasonable structure design has led to single wheel cultivator poor stability, therefore the phenomenon of side tumbling have frequently occurred during farming, plus the operator's illegal operation and other human factors ultimately contributed to the accident, therefore this article selects Hunan existing single wheel paddy field cultivator machine that two representative type (1ZD-20,1ZSQ-25) to carrying out safety performance research.This article focuses mainly on the theory of the cultivator structural parameters and operating parameters for stability analysis identify the deficiencies of existing design models. First carries on the stress analysis, and then the single wheel cultivator barycenter carries on testing and solving, and find out it's 3d parameters, combining with actual unit parameters to analysis the relevant factors that affect the safety performance, and find out the changes of factors to influence coefficient of side tumbling safety, the specific performance:1. Speed, minimum turning radius, turning angle, weight and other factors as the key factors that affect safety performance;2. Weight obvious effect on the security and stability, increasing weight is the fastest and most direct way to improve the safety coefficient of the existing models;3. Steering angle to a certain extent affected the safety coefficient, control the maximum steering angle can better master side tumbling torque produced,the influence of speed relatively less than it, but the high speed is also to be avoided, the influence of minimum turning radius is the smallest, so the minimum turning radius to permit the appropriate increase.To 1ZD-20 type cultivator adopt aggravating and slow method, on its side tumbling safety coefficient carried on analysis and orthogonal test, the results show that:the lateral fulcrum aggravating is the primary factor effect cultivator turning safety coefficient, followed by the way of cultivator installation, speed is the smallest. Between different levels of the three factors the optimal combination is:installed the lateral fulcrum on the left side for the driving direction is benefit barycenter to be steady, barycenter point horizontal distribution is close to the inside of the stable triangle, increased the stability of torque, with a low driving speed reduced the size of the centrifugal torque, which reduces the production of side tumbling torque, increase the weight of the lateral fulcrum, rapidly increasing the size of a stable torque.To add slip clutch structure model carries on the corresponding side tumbling safety performance impact analysis and field experiments, the results of the study show that:barycenter position have changed since adding clutch, reduce the machine barycenter height, set the maximum turning angle and the like improvement measures have greatly improved the safety coefficient, the Tieniuwang improve 45%, and Sanniu model raised more than 20%; For the Sanniu brand 1ZD-20 cultivator for field experiments indicate that, after changing,the overall safety coefficient is increased greatly compared with before, the field without side tumbling phenomenon. Especially at the highest speed cases, in the case of no weight the safety coefficient increased by nearly 30% compared with change before. For the Tieniuwang brand 1ZSQ-25 cultivator for field experiments show that after changing, the overall safety coefficient is increased obviously compared with before, increased from 1.320.68,the field without side tumbling phenomenon.Finally,based on the theoretical analysis and experimental research, combine existing single wheel cultivator structure design presence the safety performance deficiency, puts forward the improvement measures and solutions, from the lower center of gravity height,offset barycenter offset,increased weight,limiting speed and turning radius and other parameters to improvement, meanwhile to the clutch structural pattern, the control mode, the safety protection mode and various safety protection forms makes the improvement, finally, in structural form and control structure layout was reasonable improvement and ascend, ensure the safety of the cultivator operation, strengthened existing cultivator for the safety stable performance. from the model structure analysis and field balancing stability researches to start, radically to identify the underlying causes of lack of safety, to make up for single wheel cultivator of safety performance is insufficient, raise the safety performance of purpose, to provide a safe and reliable agricultural equipment for agricultural production.