In this paper, for the object of decision as strength and stress of the necessary setting foundation of small engines, the author experimented the four agricultural engines, and measured the strains used the strain meter. Moreover, recorded the vibration amplitudes and compared. The result of these experiment it were the constant relationship between strain value, strain direction and engine speed, but didn't always connect proportional to between strain and amplitude. Another studies, checked calculation from vibration shaking force and ratio of measuring direction magnitude. External force and strain was vary on the resonance point, so it way peculiar trend.
Max. pull increased with increment of the weight and the distance of position of balance weight loading, but the handle reaction reduced. On the no-wheel-weight loading, Ka (balance weight/weight of garden tractor)×100 per cent was in order of weight of balance weight load-ing 10kg>″20kg>″30kg, and on the wheel-weight loading, it was 30kg>20kg>10kg. That is, when the ratio of balance weight loading and weight of garden tractor was larger, the augmentation of max. pull was dropped to lower efficiency. When hitching point was transfered to the front of driving-shaft, max. draft force increased and handle reaction reduced. Also max. draft force increased with the increment of position of center of gravity, and on the no-wheel-weight loading, max. draft force increased like straight line to 20cm of position of center of gravity, and on the wheel-weight loading, to 30cm or more of it. Therefore, as the weight of garden tractor became larger, max. draft force did not reduce the augmentation to remote distance of center of gravity.
Wheel efficiency is obtained as follows. ηW is the ratios of the power to advance against the output of the wheel axis. ηW=cosδ(1-μ) δ; Angle of rolling friction. μ; Travel reduction, slip percentage of the wheel. μ is one of the factor that shows the wheel faculty, and it is decided by the wheel motion which is followed by the load and the reaction force of soil to the wheel. There are one travel reduction to cause the stress in the soil which keeps the ballances against the loads. In this paper, the motions of the farm wheel are analysed. α is the inclinated angle moving direction of one point on the wheel to the horizontal line, dF is the moving distance of that point, dF and dS are respectively perpendicular components of dF to that wheel surface.
1. The flow of fertilizer in the side-delivery hopper can be divided into five flowing layers-from i to v. The flowing layer i on the bottom is the leading one and generates other layers ii -v. These layers differ each other with respect to the flowing velocity and quantity, but there are close mutual relations among them. 2. As the flow makes a detour from iv to i, mixed fertilizers are inclined to be seperated one by one in the course of flowing. The discontinuity of flow is so remarkably lowered as compared with in case of the downward-delivery hopper, that there remains no layer which does not move, and the flow presents a single type regardless of sorts of fertilizers. But there are some respective differences of fluidity among various fertilizers, which are due to the differences of their shearing characteristics. 3. The results of this experiment suggest some practical methods to improve fertilizer distributors. Because of the intensity of shearing effects, the side delivery mechanism is proved to be effective than the downward-delivery one for preventing stagnation of the flow. The shapes and structures of agitators should be amended so as to stimulate the flow of layers iii-v. For the control of discharge, it is preferable to adjust the opening of the gate than the revolving speed of the delivery mechanism.
This paper presents the experimental results of the compressibility of green or dry sheaves, using some binding materials on variable tightening forces. We have got some results, that is: 1. The relation between the rate of shrinkage of sheaves and the tightening force of binding material is represented by the experimental equation: E=a+mlogW where, E: rate of shrinkage (%) W: tightening force (kg) a, m: coefficients 2. The rate of shrinkage of sheaves does not depend upon the kind of binding materials, but it diminishes as the diameter of binding material becomes larger. 3. The sheaves of green barley and wheat shrink easier than green rice sheaves, but there is little difference of shrinkage in dry sheaves. 4. We could not find out the difference in the characteristic of shrinkage between before and after the ripening season. The rate of shrinkage of the sheaves of green stalks is smaller than that of dry sheaves. 5. If the binding force is released, the sheave can not regain its original volume. We call this phenomenon residual shrinkage. The rate of residual shrinkage changes in obedience to the rate of shrinkage. 6. When the sheaves are binded by uniform force, the quantity of shrinkage, of sheaves is larger in accordance with the volume of sheaves, while the rate of shrinkage is smaller. 7. In this test, we come to the conclusion that nearly 50%-shrinkage of sheaves is enough for small binder, and that the standard tightening force for small sheaves is 10-15kg.
The vibration of the knapsack mist sprayer causes the worker to be tired. And so, in this report, the author investigated experimentally the vibration of its. On this type mist sprayer, the vibrations are mainly occured by the revolution of engine. The vibrations were measured at several points on the engine and the knapsack fiame by the Askania type hand vibrograph. As the results it became clear that the vibrations of this type mist sprayer are perfectly taken away by setting each part of mist sprayer on adequate position and useing the vibration absorber.
The relation between lift and spring elasticity and volumetric efficiency of the flat valve for use of suction and discharge of power sprayer was examined, and the condition of the movement of valve was observed with photographing and discussed. The results were as follows: 1) Maximum limit of lift was in 0.25-0.3d (d: diameter of valve seat), and spring was the stronger, the efficieney was the better. 2) Spring elasticity was the stronger and r. p. m was the fewer, the practical lift of valve the fewer, and the lift did not always show the full rising and falling. 3) The valve rose and fell in the inclined carriage to the valve seat. This inclination was especially large at the valve without stem guide.