Combination Evaluation Method of Excavator Active Digging Force

Abstract

The invention discloses a method for evaluating active digging force combinations of a digger. The method includes: determining a digging point of a bucket, obtaining maximum theoretical digging force meeting four limiting factors of the digger itself under free combinations of three active factors, and determining a maximum value in the maximum theoretical digging force corresponding to the multiple combinations of the three active factors within an effective range as a maximum active combined digging force of the digging point. By taking actual application of the digger as a starting point and taking more actual probability into consideration, the maximum theoretical digging force capable of being brought into play at a given digging point is obtained by starting from the digging point, so that digging capability of the digger at different areas can be evaluated more reasonably and comprehensively; more reasonable and comprehensive factors are taken into consideration by the maximum digging force based on the active combinations, so that actual digging capability can be reflected better, and optimized designing of the digger is facilitated.

Description

technical field [0001] The invention relates to a performance index of engineering machinery, in particular to an evaluation method of digging force based on active combination. Background technique [0002] Excavators play an extremely important role in construction, mining, agriculture, water conservancy and other fields. The digging capacity of an excavator is one of the most critical indicators for evaluating the performance of an excavator. The theoretical excavation force is not only the basis for the structural design, strength calculation and counterweight selection of the excavator working device, but also an important parameter reflecting the excavation performance. [0003] In the prior art, the theoretical mining force has traditional analysis and evaluation methods. The maximum theoretical digging force of the excavator under the specified posture is obtained by using the evaluation method that has been used so far, and the stability coefficient of the excavat...

AI Technical Summary

Problems solved by technology

After analysis and research, we found that the traditional calculation method of theoretical excavation force has the following problems: 1. Only consider the tangential excavation force, or simply consider the normal-to-cut ratio as a fixed value, which is usually taken as 0.2; 2. Starting from the attitude of the working device, we get It is only the maximum digging force of the digging point in one posture, not the maximum digging force of the digging point. In this paper, the digging point refers to the position of the bucket cutting edge in space; 3. The calculation method of compound digging force is different from that of the single Mining calculation methods are essentially the same, and cannot truly reflect the compound mining capabilities

It can be seen that the traditional theoretical digging force calculation method does not take into account the influence of the changes of the three factors of the law cut ratio, digging attitude and digging method on the maximum theoretical digging force of a given digging point, which fundamentally determines the maximum theoretical digging force. The inaccuracy of digging force calculation can not truly reflect the digging capacity of the excavator

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