Pull, Torque Slip Characteristics of Braked Wheel of Seed Drills and Planters
Karakteristike vuče, obrtnog momenta i klizanja kočenog točka sejalica i sadilica
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Author
Walke, Vivek
Keywords
pulltorque
skid
axle load
ground wheel
vuča
obrtni moment
klizanje
osovinsko opterećenje
pogonski točak
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Show full item recordAbstract
Sowing or planting is one of the most important farm operations.
Generally it is done by seed drill and planters. Metering device govern the seed to seed
spacing in sowing operation. A constant velocity ration between the ground wheel shaft
and the shaft of metering device helps in maintaining regular hill to hill spacing.
Metering device requires torque for its operation which is derived from the ground
wheel. Therefore, the ground wheel in seed drills and planters works as a braked wheel.
The braked wheel experiences negative slip which is known as skid. Excessive value of
skid will result in alteration of spacing between hills. Skid increases with the increase in
braking torque resulting in large variations in hill to hill spacing. Hence, the relationship
between braking torque and skid is important to the designer of seed drills and planters.
The relationships between pull, torque and slip characterizes the behavior of the braked
wheel. An experiment was carried out to determine skid at different lug height (15, 20,
25, 30, 35 and 40 mm), different axle load (98.1, 147.15 and 196.2 N) and different
torque. A regression model was developed relating skid (s) with lug height (L) and
torque (T). Axle load had no significant effect on skid in the range studied. The
regression model was a quadratic polynomial equation having (R2 = 0.82). Expected
value of skid at different values of lug height and braking torque were calculated from
the regression equation and given in a table. This can be used for determining lug height
when torque requirement and permissible level of skid were known. It can be seen that
skid increases with decrease in lug height almost for all values of braking torque. Setva ili sadnja su među najvažnijim operacijama u poljoprivredi. Merni
uređaj na sejalici ili sadilici određuje rastojanje između zrna. Konstantan odnos brzine
vratila pogonskog točka i vratila mernog uređaja održava pravilno rastojanje između
sadnica. Merni uređaj zahteva pogonski obrtni moment od pogonskog točka. Zato
pogonski točak pri trenju sa podlogom radi kao kočeni točak. On trpi negativno klizanje
poznato kao klizno kočenje. Porast vrednosti prokljizavanja dovodi do promene
rastojanja između sadnica. Povećano klizanje sa povećanjem momenta kočenja dovodi
do značajnih variranja u rastojanju između sadnica. Zato je za konstruktore sejalica i
sadilica važan odnos kočionog momenta i klizanja. Odnosi između vuče, momenta i
klizanja karakterišu ponašanje kočenog točka. Ovaj ogled je izveden da bi se odredilo
klizanje pri različitim visinama poteznice (15, 20, 25, 30, 35 i 40 mm), različitim
osovinskim opterećenjima (98.1, 147.15 i 196.2 N) i različitim obrtnim momentima.
Razvijen je regresioni model koji uključuje klizanje (s), visinu poteznice (L) i obrtni
moment (T). Osovinsko opterećenje nije imalo značajan uticaj na klizanje u ispitivanom
opsegu. Regresioni model je imao oblik kvadratne polinominalne jednačine (R2 = 0.82).
Očekivana vrednost klizanja pri različitim visinama poteznice i kočionim momentima
izračunavani su iz regresione jednačine i prikazani u tabeli. Ovo se može upotrebiti za
određivanje visine poteznice kada su poznati potrebni obrtni moment i dozvoljeni nivo
klizanja. Može se uočiti da klizanje raste sa opadanjem visine poteznice pri skoro svim
vrednostima kočionog momenta.