grass cutter

Abstract

The invention relates to a lawn mower, which comprises a casing, a first cutter shaft, a first transmission device, a first cutter, a second cutter and a third cutter, and the two ends of the first cutter shaft are installed on the casing respectively. One end of the first knife shaft is connected to the first transmission device on the two side plates of the housing, the first transmission device is installed on one of the side plates of the housing, the first cutter and the second cutter are respectively set on the first knife On the shaft, it also includes a second cutter shaft and a second transmission device. After the two ends of the second cutter shaft are respectively installed on the two side plates of the housing, the axial direction of the second cutter shaft is the same as that of the first cutter shaft. The axial directions are parallel to each other. After the third cutter is arranged on the second cutter shaft, the third cutter is misaligned with the first cutter or the second cutter. The second transmission device is installed in one of the housings. On the side plate, the second transmission device is connected with one end of the second cutter shaft. The invention prevents material from clogging in the mower.

Description

technical field [0001] The invention relates to a straw processing device for harvesting grains by a harvester, in particular to a grass cutter for chopping straw, and belongs to the technical field of agricultural machinery. Background technique [0002] If the length of the straw left by the combine harvester is too long, farmers generally use the method of burning the straw to clean up the field. When burning the straw, a large amount of smoke and dust are generated to seriously pollute the air. The greenhouse effect; runs counter to the environmental protection requirement that reduces the carbon dioxide emission in the atmosphere. [0003] In order to avoid the aforementioned situation, the existing combine harvesters use low stubble to harvest crops, which reduces the height of straw left in the farmland and makes it impossible to burn. At the same time, the length of straw cut by the combine harvester is relatively long, and must be chopped by the grass cutter of the...

AI Technical Summary

Problems solved by technology

In order to increase the chopping effect, it can be achieved by increasing the rotation speed and the number of knives, but when the feeding is uneven and the crops are wet, there will be blockage and damage to the transmission parts

In addition, when the feed crop is relatively long, it will be entangled on the moving knife shaft, and resistance will increase and resistance will occur after long-term use, which will affect work efficiency

Although this kind of grass cutter increases the grass cutting performance by increasing the spindle speed of the grass cutter, the length of the cut straw is about 15mm, which cannot achieve the purpose of returning to the field effectively

Moreover, the mounting seat for installing the movable blade is fixed on the shaft sleeve by welding. Since the moving blade and the shaft sleeve are subjected to great resistance when cutting grass, after long-term use, it is easy to cause the welding place between the mounting seat and the shaft sleeve to break. , resulting in adverse consequences of flying out of the mounting seat together with the moving blade

[0005] In addition, because the diameter of the rotating shaft that drives the movable knife to rotate is small, when the input straw or uncut straw is easily wound on the rotating shaft, for example, the diameter of the rotating shaft is 150mm, and the length of the straw is 200mm or more. The length of the shaft is greater than the diameter of the shaft. Therefore, it is easy to cause the straw to be easily wound on the shaft. However, if the diameter of the shaft is enlarged, it will cause interference with the housing after the movable knife is installed, or increase the volume and quality of the whole machine, which will inevitably increase. The load of a large tractor, therefore, the diameter of the shaft can only be selected within the specified range

[0006] In addition, when the amount of stalk input into the grass cutter is too large, since the fixed blade is directly locked on the bottom of the housing through the bolt or the pin shaft and the backing plate, when the stalk is blocked between the movable blade and the fixed blade time, the straw cannot be chopped, and the distance between the fixed blade and the moving blade cannot be changed, and the blocked straw cannot be discharged in time, causing overload and causing damage to the transmission device

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