Speed changing unit of straw returning machine

Abstract

The invention relates to a gear change mechanism for returning stalks to farmlands, comprising an input conical gear shaft, a positive rotation conical gear and a reverse rotation conical gear, a gear shifting sliding bush, a high speed fixed gear wheel and a low speed fixed gear wheel, a high speed sliding gear and a low speed sliding gear, a first shaft, a second shaft and a box body, wherein, the positive rotation conical gear and the reverse rotation conical gear are amounted on a shaft by a bearing while a positive gear shifting sliding bush is sheathed on the first shaft by a spline, the high speed fixed gear wheel and the low speed fixed gear wheel are fixedly amounted on the shaft, the high speed sliding gear and the low speed sliding gear are sheathed on the second shaft by the spline, and the conical gear shaft is meshed with the positive rotation conical gear and the reverse rotation conical gear simultaneously; the position of the gear shifting sliding bush is changed to control the positive rotation gear shifting and the reverse rotation gear shifting, and the position of the high speed sliding gear or the low speed sliding gear is changed to realize high speed and low speed gear shifting; during the process of rotary tillage and stubble cleaning, when a stubble cleaning cutter shaft is wound by weeds, the stubble cleaning cutter shaft can rapidly get rid of the weeds by rotating reversely, thus improving the effect and efficiency of rotary tillage and stubble cleaning; in addition, different rotary tillage rotation speeds can be applied to different plant stalks for carrying out stubble cleaning.

Description

Technical field: [0001] The invention relates to a straw returning machine, in particular to a variable speed device of the straw returning machine. Background technique: [0002] In order to more effectively promote the technology of returning straw to the field and prevent farmers from burning straw to pollute the environment, the state has increased financial subsidies for the use of straw returning machinery and introduced more favorable support policies. Farmers across the country have begun to use straw returning machines on a large scale. At present, the existing rotary tillage stubble cultivators in China include tie rod couplings, horizontal rods, carriages, carriage adjustment struts, adjustment rods and mud presses, suspension assemblies, gearboxes, rotary tillers, and intermediate ploughs. Although they all have the functions of tillage, soil breaking, stubble burying, leveling, etc., in the process of rotary tillage and stubble, the stubble shaft is very easy to enta...

AI Technical Summary

Problems solved by technology

[0002] In order to more effectively promote straw returning technology and prevent farmers from burning straw to pollute the environment, the state has increased financial subsidies for the use of straw returning machines and introduced more favorable support policies. Farmers across the country have begun to use straw returning machines on a large scale At present, the existing domestic rotary tillage and stubble removal machines include tie rod joints, horizontal rods, carriages, carriage adjustment struts, adjustment rods and mud pressing plates, suspension frame assemblies, gearboxes, rotary tiller sets, and intermediate plows. Although they all have t

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