JPH0319601A - Beam for subsoiler - Google Patents

Abstract

PURPOSE:To eliminate interference with cutouts in the upper part of blade edges and improve strength of a beam by deviating the positions of cutouts in the upper part of blade edge in the height direction and forming the blade edge into a left and right asymmetric shape. CONSTITUTION:A blade edge 12 to provide a cutting blade is formed in the edge on the front side of a beam and slopes are formed left and right of the front edge of the blade edge 12 as the center line. The wall thickness thereof is increased toward the back end. The top part of the blade edge is asymptotic to the side of the beam body 10 describing a spherical surface with a radius (r). The positions of the cutouts (13L) and (13R) in the longitudinal direction of the beam body is different in the left and right sides with the front edge of the blade edge as the center. Stress can be dispersed due to the separated positions of the aforementioned cutouts, contributing to an increase in strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a beam for a subsoiler, and more particularly to a beam for a subsoiler that prevents stress from concentrating on the excavation blade portion near the upper end of the beam of the subsoiler.

[Conventional technology]

The conventionally well-known subsoiler is a beam (also called a standard or shank) with a chisel attached to its lower end that is inserted into the soil and pulled by a tractor to crush the plowing ground. This method is used for the purpose of regenerating cultivated soil by supplying oxygen to the cultivated soil by forming slits in the cultivated soil.

The beam main body 1 constituting this subsoiler has a blade 2 formed along its length on the front edge in the direction of work progress, and is provided with a so-called blade attachment, which facilitates the excavation of cultivated soil. It is designed to reduce digging resistance when being towed through the soil.

This blade a2 is symmetrical when viewed from the front, and the blade thickness gradually increases toward the rear in the direction of work progress, and the blade edge 2
The two upper ends of the beam also form a curved surface that converges to the thickness of the beam body.

In excavation work using this beam body, when considering the bending moment applied to the beam body, it is considered that a uniformly distributed load is applied to the blade edge 2, and the bending moment diagram draws a quadratic curve at the fulcrum. The moment distribution with the maximum value is considered.

[The problem that the idea attempts to solve]

Therefore, since the thickness of the member changes greatly at the upper end 2A of the blade edge, a notch will be formed in the material mechanics-F notch. The stress caused by the load applied during work was quite large, and in severe cases, it could cause breakage.

Therefore, the present invention aims to provide a beam for a subsoiler that is free from breakage by preventing as much as possible the stress concentration caused by the change in wall thickness at the upper end of the blade edge shape, in other words, the notch. It is intended to be Ll-like.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a subsoiler beam in which excavation blades are formed on both sides of the leading edge. This is characterized in that it is designed to prevent stress concentration at the upper end of the excavating blade.

[Function] The subsoiler beam of the present invention is constructed by dispersing stress concentration points created by the formation of the blade edge into at least two places, so interference caused by the notch at the top of the blade edge is eliminated, improving the strength of the beam. can be done.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings. In these drawings, reference numeral 10 indicates the whole hem, a chisel 11 is attached to the lower end, and an attachment hole 11 to the subsoiler frame is attached to the upper end. A is worn.

A cutting edge 12 serving as a digging blade is formed on the front edge of the beam, and this cutting edge 12 is sloped from side to side with the front end as the center line, and becomes thicker toward the rear end. The upper end of this blade edge aligns the spherical surface of radius r to the beam body 10.
It is asymptotic to the side of . This spherical curved surface constitutes the notch 3 of Murano Mechanics -■-, and on the left and right sides of the front end of the blade edge, there are notches 131,
and 13R are different in the lengthwise position of the beam body. In other words, the two left and right notches 13L, 1.
If the 3Rs are close to each other, the interference phenomenon of the cutouts will occur, resulting in a noticeable decrease in strength, but by placing the notches far apart, the stress can be dispersed, increasing the strength. Contributing.

In addition to the shapes shown in Figs. 2 and 3, the shape of the bonfire 13 is as follows.
As shown in the side view and front view shown in FIGS. 4 and 5, the bonfire can have a planar shape as well as a curved surface.

〔Effect of the invention〕

As is clear from the above explanation, the subsoiler beam of the present invention has an asymmetrical shape in which the notches at the top of the blade green are not arranged on the same line in the left and right direction, but are shifted in the height direction. Therefore, it is possible to prevent notch interference caused by the load applied to the beam, which has the effect of increasing the strength of the beam.

[Brief explanation of drawings]

Fig. 1 is a side view of the subsoiler beam of the present invention;
The figures are a front view, FIG. 3 is a side view, FIG. 4 is a front view and a side view of a beam according to another embodiment, and FIG. 5 is a front view, a side view, and a side view of a beam according to another embodiment. FIG. 6 is a side view showing a conventional beam.

Claims (1)

[Claims] (1) In a subsoiler beam with excavation blades formed on both sides of the leading edge, the upper end of the excavation blade is formed by an asymmetric notch on the left and right with the blade edge as the center. A beam for a subsoiler characterized by being configured to prevent stress concentration.