A self-limiting device for the lower knife of a harvester

Abstract

The present invention provides a self-limiting apparatus of a lower knife of a harvester, comprising a limit bolt, a left limit block (833c), a right limit block (832d), a left limit block baffle (711c) and a right limit block baffle (711b). The right limit block (832d) is integrally welded on an elevator platform square duct (832e) arranged on the right side. The left limit block (833c) is integrally welded on an elevator platform square duct (833b) arranged on the left side. The left limit block baffle (711c) is integrally welded on a connection tube (711a). The right limit block baffle (711b) is welded on a square tube (711e) on the right side of a frame. According to the self-limiting apparatus of the lower knife of the harvester, the left limit block (833c) and the right limit block (832d) are integrally welded on an elevator platform on the left side and the right side respectively, the left limit block baffle and the right limit block baffle are integrally welded on the left side square tube and the connection tube which are welded together and arranged on the frame, and the limiting purpose can be achieved through limiting bolts. Therefore, the self-limiting apparatus of the lower knife of the harvester is simple to operate, can automatically limit after one-time adjustment, is wide in the adjustment range as the allowance of the bolts is big, and is simple in structural design, not high in accuracy requirements and low in manufacturing cost. In addition, the whole apparatus is provided with a few of parts.

Description

Technical field [0001] The invention relates to a combine harvester, in particular to a lower knife limit mechanism of the combine harvester. Background technique [0002] At present, most of the harvesters on the market are equipped with a secondary cutting device that can cut the crop stubble, also called the lower knife. The use effect of the existing lower knife is to prevent it from falling into the mud or rising from the cutting platform during work. The bottom interference is equipped with its own limit device. Through the limit device, the lowest and highest working positions of the knife are given, that is, the minimum distance from the ground and the maximum lift height. Suzhou Kubota Company once introduced a secondary cutting device with patent number ZL201220064344.5. Its height limit is realized by a compression spring installed on the frame. This device has a complicated structure, inconvenient operation, and requires manufacturing cost and precision. High, and th...

AI Technical Summary

Problems solved by technology

This patent installs a limit rod between the header and the lower cutter, so that the header and the lower cutter can maintain an appropriate safety distance when they approach each other during their respective lifting movements, and the lower cutter can cut The lower position of the crop stubble, this device ensures that the lower cutter does not touch the ground, but because it is connected to the header, the adjustment distance is restricted by the height of the header from the ground, and the lower cutter has a heavy weight. During the process, the limit device often needs to bear the load, but this patent only uses a limit rod to hinge the header.

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