Felling saw

Abstract

The invention discloses a felling saw. The felling saw comprises a casing provided with a side surface opening, a cover plate connected on one side surface of the casing, guide rails fixedly mounted on one inner side wall of the casing and arranged in the front-and-back direction of the casing, a mounting plate glidingly connected onto the guide rails, an electric push rod connected between the mounting plate and the back part of the inside of the casing as well as a motor fixedly connected on the mounting plate, wherein a rotating shaft of the motor extends to one side wall of the casing; the felling saw further comprises a guide plate connected to one outer side wall of the casing, chain wheels connected at the front end of the guide plate and on the rotating shaft of the motor as well as a saw chain connected between the two chain wheels. The tightness degree of the saw chain is adjusted automatically and conveniently through cooperative work of the electric push rod and a tension sensor, and the saw chain can be automatically adjusted to the state suitable for normal work without experience.

Description

technical field [0001] The invention belongs to the field of electric logging saws, and in particular relates to a saw chain structure of the logging saw. Background technique [0002] The tightness of the saw chain of the existing logging saw is manually adjusted, which needs to rely more on empirical judgment, and the adjustment is troublesome. In addition, the saw chain of the existing common logging saw includes a connecting link, a left cutting link and a right cutting link, and the left cutting link and the right cutting link are arranged alternately, and the adjacent left cutting link and the right cutting link There is a connecting link between the chain links, and the adjacent chain links are connected by driving pieces and rivets; generally, the cutting link includes two connecting pieces, one of which is integrally connected with a generally L-shaped cutting piece. The blade, and the edge end of the front end of the cutting blade protrudes slightly forward. At th...

AI Technical Summary

Problems solved by technology

[0002] The tightness of the saw chain of the existing logging saw is adjusted manually, which requires more experience and judgment, and the adjustment is more troublesome

In addition, the saw chain of the existing common logging saw includes a connecting link, a left cutting link and a right cutting link, and the left cutting link and the right cutting link are arranged alternately, and the adjacent left cutting link and the right cutting link There is a connecting link between the chain links, and the adjacent chain links are connected by driving pieces and rivets; generally, the cutting link includes two connecting pieces, one of which is integrally connected with a generally L-shaped cutting piece. The blade, and the edge end of the front end of the cutting blade protrudes slightly forward. At the moment when the blade is in contact with the object to be cut, the cutting blade is subjected to a force opposite to the cutting direction, and a component of the force will produce a force on the rivet. The radial shear force, another component force will generate axial pulling force on the rivet, which will cause pressure between the rivet head and the connecting piece, and loosen the contact part between the rivet head and the connecting piece. After the rivet and the connecting piece are loose, due to The position of the connecting piece moves to different degrees, and the shear resistance of the rivet also decreases. The rivet is especially stressed on the side close to the cutting blade, which is prone to strain or even breakage, and there is a great potential safety hazard.

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