Ripper of the soil crust

Abstract

This article presents the kinematics and dynamics of the tooth of the device for the destruction of the soil crust in the spring period on the seed beds (ribbons) of seedlings of the first year of sowing.

A dense airtight soil crust is formed on the seed beds, which prevents oxygen from reaching the root system of seedlings of the first year of coniferous seedlings. Existing devices, when loosening, shift the fragments of the crust together with the weak roots of seedlings, especially Siberian cedar pine, which leads to damage of seedlings and a drop in the yield of planting material.

The scheme and design of the tool for loosening the soil crust without damaging the root system of seedlings are proposed.

The ripper is a hinged device consisting of a crankshaft, on the cranks of which the teeth of the soil crust ripper are pivotally mounted. The gear ratio of the crankshaft drive from the support wheel is selected from the condition of ensuring equality of the translational speed of the chassis and the portable translational movement of the crank centers. The loosening depth can be adjusted.

Using the Chebyshev method, theoretical substantiations of the kinematics and dynamics of the ripper tooth were performed.

The speed of the crank axis is calculated and a velocity plan and an acceleration plan are constructed. The calculations took into account the moment of friction and the mass of the tooth. If, for design reasons, the actual weight differs from the calculated one, then a compensatory removable load must be installed on the tooth axis.

Based on the above, it can be concluded that it is advisable to create a prototype design of the considered tool for loosening the soil crust without shifting the root system of seedlings relative to the soil horizon.