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258 Iona Ţenu et al. parameters: working depth of the tillage equipment active parts: 0...300 mm; the setting angle of the tillage tool: -25 0 ...+25 0 (it is possible to adjust the active part soil penetration angle with 25 degrees more or less than average angle); the carriage speed (when towed by the cable by the 5.5 kw electric motor): 0.5… 1.55 m/s; the tyre wheel and compaction roller maximum vertical load: 500 daN; the maximum towing force (of the carriage) at the carriage speed of 0.55 m/s: 800 daN; the maximum towing force (of the carriage) at a carriage speed of 1.55 m/s: 280 daN; the minimum breaking strength of the towing cable: 40.83 kN. It was concluded that there were no significant differences between the design parameters and the achieved ones. In the second stage, the laboratory rig was tested in order to evaluate the moldboard plough body-ground interaction and tyre wheel- ground interaction (Fig.2). 3.1. Tests under Laboratory Conditions Regvar<strong>din</strong>g the Active Part-soil Interaction A plough body with the working width of 200 mm, mounted on the rig carriage, was tested. In this case, the effects of the working depth, soil penetration resistance and working speed of the plough body over the towing force and specific power consumption were evaluated. The results of the tests are presented in Table 1. The results show that the increase of plough body travelling speed leads to a increase of the towing resistance force. At the same time, the increasing speed of the plough body has the effect of a pronounced increase of the specific power consumption. It may also be noted that an increased soil penetration resistance leads to a significant increase of the towing resistance force. In the meantime, an increased soil penetration resistance leads to a significant increase of the specific power consumption. It was also found that as the body plough working depth increases, there is a notable increase of the towing resistance force. In the meantime, the increase of the plough body working depth causes a slight and uneven variation of the specific power consumption: increasing the working depth from 100 mm to 150 mm leads to a slight decrease of the specific power consumption; when further increasing the working depth from 150 mm to 200 mm, an increase of the specific power consumption was recorded. These variations of the specific consumption of power may be thus explained: for low working depths (bellow 15 cm), the slice of soil displaced does not form a furrow (there is no slice roll-over), so the specific power consumption is low; for working depths above 15 cm the conditions for the furrow rollover are becoming better (in this situation, the torsion and inversion of the furrow are achieved and the specific power consumption increases), so that the specific energy consumption is getting higher.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 259 Table 1 The working parameters of the test rig for the plough body-ground modelling interaction Plough body working depth mm 100 150 200 Soil penetration resistance MPa 0.2 0.4 0.2 0.4 0.2 0.4 Plough body Towing Specific power speed resistance force consumption m/s N W/cm 2 0.75 705 2.65 1.00 720 3.60 1.25 735 4.59 0.75 925 3.47 1.00 940 4.70 1.25 960 6.00 0.75 1055 2.64 1.00 1070 3.57 1.25 1080 4.50 0.75 1380 3.45 1.00 1400 4.67 1.25 1420 5.92 0.75 1450 2.72 1.00 1470 3.67 1.25 1485 4.64 0.75 1859 3.47 1.00 1890 4.72 1.5 1930 6,03 a b Fig. 2 – The test rig experimentation under laboratory conditions of the tyre wheel and active part interactions with the ground: a – the wheel-ground interaction study; b – the plough body-ground interaction study.
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BULETINUL INSTITUTULUI POLITEHNIC D
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