•   1. Advantages of limited-torque hydraulic couplings
  ◆ To enhance the starting capability of squirrel-cage induction motors, we can leverage the motor’s peak torque as the starting torque, thereby avoiding the unreasonable mismatch phenomenon of “using a large horse to pull a small cart.”
  ◆ Shorten the electric motor’s starting time and reduce the inrush current during the starting process.
  ◆ Prevent power overload and protect the motor and working machinery from damage due to overload.
  ◆ Reduce vibration and impact during the starting process.
  ◆ In multi-motor drive systems, it ensures that each motor starts independently, achieves power balance, and can provide a starting torque limit ranging from 1.2 to 1.6 times the rated torque.
  ◆ Simple and reliable structure, no mechanical wear, and requires no special maintenance.
  ◆ Able to work in a variety of harsh working environments.
  
  2. Application scope of hydraulic couplings
          Widely used in various types of mechanical equipment across industries such as power, iron and steel, metallurgy, mining, coal, building materials, chemical engineering, ports, lifting, transportation, and construction machinery. Examples include: belt conveyors, scraper conveyors, chain conveyors, screw conveyors, bucket elevators, wheel stacker-reclaimers, coal mills, ball mills, crushers, bridge cranes, gantry cranes, tower cranes, leather tanning drums, washing machines, wire-drawing machines, rubber mixing machines, boiler slag crushers, centrifuges, amusement machines, and more.

   

  3. Characteristics of Limited-Torque Hydraulic Couplers

  (1) Types, varieties, and specifications of limited-torque hydraulic couplings:
  ◆ By transmission medium: either mineral oil or water-filled; these have the same axial installation length, and their components are fully interchangeable.
  ◆ By drive type: the YOX series is driven by an outer impeller (pump impeller); the YOXn series is driven by an inner impeller (turbine impeller).
  ◆ By cavity type: there is the single-cavity YOX series; and the double-cavity YOXD series.
  ◆ Structural classification based on starting time length: YOP series—without rear auxiliary chamber; YOX series—standard type; YOXV series—extended rear auxiliary chamber type; YOXvvs series—extended rear auxiliary chamber and enlarged side auxiliary chamber type.
  ◆ By equipment transmission characteristics: there are the YOXP series with belt pulleys; and the YOXIIZ and YOXNZ series with brake wheels.

  ◆ By easy-disassembly type: YOXA series with elastic sleeve pin couplings.

   

  (2) Characteristic curve (at a liquid filling rate Qc = 80%)
  ◆ The combined starting characteristic curve of the electric motor and the hydraulic coupling is shown in Figure 1.
  ◆ The original characteristic curve diagram of the hydraulic coupling’s starting process is shown in Figure 2.
  ◆ The start-up time and process curves for the motor and hydraulic coupling are shown in Figure 3.
   
  
   

  

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  (3) Designation and Meaning of Hydraulic Coupling Codes and Markings
          The designations and markings of hydraulic couplings shall be indicated using Chinese pinyin letters in accordance with GB/T 5837-2008 .
           1. Hydraulic couplings driven by an external impeller and using mineral oil as the working medium do not require any codes or letters to denote them.
           2. Meaning:

  

  

   

Related downloads:

ZTE Limited-Radius Hydraulic Coupler (YOX) Sample.pdf