طراحی، ساخت و ارزیابی عملکرد شیر کنترل قابل نصب در خروجی پمپ هیدرولیک تراکتور MF285

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی بیوسیستم، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

چکیده

چکیده
شیر کنترل پمپ هیدرولیک تراکتور MF285 از نوع کشویی است و در ورودی پمپ تعبیه شده است. این امر باعث می­ شود تا واکنش سامانه کنترل خودکار کشش تراکتور در برابر تغییرات شرایط خاک به موقع نبوده و از این طریق بازده کششی تراکتور کاهش می­ یابد. در این تحقیق یک شیر کنترل جدید قابل نصب در خروجی پمپ هیدرولیک و با قابلیت کنترل الکترونیکی و با هدف بکارگیری در سامانه کنترل الکتروهیدرولیکی اتصال سه نقطه تراکتور طراحی و ساخته شد. به منظور اطمینان از صحت عملکرد شیر کنترل جدید، تاثیر دو نوع شیر کنترل (الکترونیکی و مکانیکی) در سه سطح دور موتور و سه سطح فشار روغن هیدرولیک بر روی دبی پمپ در قالب طرح کاملا تصادفی و با سه تکرار بررسی شد. نتایج نشان داد که تاثیر دور موتور ، فشار روغن و اثر متقابل آن ها در سطح احتمال (1%) معنی­دار بود ولی تاثیر نوع شیرکنترل و اثرات متقابل آن با سایر تیمارها معنی ­دار نبود. در تمامی فشارهای کاری، با افزایش دور موتور دبی پمپ افزایش معنی­داری داشت. همچنین رابطه خطی معنی­ داری بین دبی پمپ و دور موتور مشاهده شد. نتایج آزمایش ­های پاسخ گذرای سامانه کنترل الکتروهیدرولیکی به ورودی پل ه­ای در فرآیندهای بالاروی و پایین روی نشان داد که سامانه کنترل با سرعت مناسبی ورودی را دنبال کرده و بعد از رسیدن به حالت پایداری، ارتفاع وسیله را در محدوده ناحیه مرگ (± 2 سانتی متر) ثابت نگه داشته است.
 

کلیدواژه‌ها


عنوان مقاله [English]

Design, Construction and Evaluation of the control valve with capable of installing at the pump outlet of the MF 285 Tractor

نویسندگان [English]

  • Ahad Ghods Azar
  • Norooz Moradinejad
Department of Biosystems Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
چکیده [English]

Abstract
The Control valve of the hydraulic pump of MF285 tractor is a sliding type and installed at the pump inlet. This causes the draft control system couldn't react on time to changes in soil conditions and consequently the tractive efficiency decreases. In this research a new control valve was designed and constructed that can be installed at the pump outlet, with electronic control capability and for use in the electro-hydraulic hitch control system. In order to ensure the correct operation of the control valve, the effects of two control valves (electronic and mechanical) under three engine speed(rpm) levels and three oil pressure levels on flow rate of the hydraulic pump were assessed by conducting a completely randomized design. The results showed that the effect of engine speed, oil pressure and their interaction were significant (P<0.01) but the effect of control valve type and its interactions with other treatments were not significant. At all pressure levels, the flow rate increased with increasing engine rpm. Also, a significant linear relationship was observed between the pump flow and engine speed. The results of transient response tests of electro-hydraulic control system to step input in raising and lowering positions showed that the control system followed the system input with a suitable speed. And after reaching the steady state, kept the height of the device in the range of the death zone (± 2 cm).

کلیدواژه‌ها [English]

  • Keywords: Tractor
  • Hydraulic Pump
  • Control valve
  • Draft Control
  • Electro-Hydraulic
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