Keywords
loading distance
loading cycle
productivity
logs
How to Cite
##article.highlights##
- Diameter of logs and distance to the truck affect productivity of manual loading system
- 10 to 30 cm diameter and 30 to 60 kg logs take 12 s to carry them.
- Logs smaller than 30 cm in diameter at distances greater than 10 m need 15 s to carry them.
- Pieces larger than 30 cm and 60 kg, more than 10 m from the truck require double manual loading time.
- The efficiency of this system can be increased by setting maximum loading distances of 10 m.
Abstract
Introduction: In some forest regions of Mexico, it is common for short-sized logs to be handloaded; however, the efficiency of this operation has been poorly documented.
Objective: To evaluate the effect of log size and distances on manual loading productivity in forests in the region of El Salto, Durango, Mexico.
Materials and methos: A total of 738 manual loading cycles of 4 ft (1.22 m) logs were timed using the ‘back-to-zero’ method. Log volume and loading distances were taken by direct in-situ measurement. Average log diameters were divided into three categories and loading distances into four. The system yield was determined by relating log volume to total loading time.
Results and discussion: Manual loading yield was established from 3.80 to 16.42 m3∙h-1, influenced by log diameter and loading distances, because 82 % of the loaded volume corresponds to logs with diameters from 10 to 30 cm, which are loaded every 12 s; logs larger than 30 cm require 27 s. Also, 91 % of the loading volume is carried out in the first 10 m of distance from the truck and takes 15 s per log, and, at longer distances, 35 s.
Conclusions: It is possible to increase the performance of the operation by considering maximum loading distances in the order of 10 m
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