Cách thay dây cáp tời điện?

Tại sao phải thay dây cáp?

Dây cáp bị mòn do:

• Mặc bình thường & mài mòn: Cọ xát vào trống, bó lúa, và tải.

• Mệt mỏi: Uốn nhiều lần trên ròng rọc.

• Ăn mòn: Exposure to moisture or chemicals.

• Kinking or Birdcaging: Improper handling or overload.

• Broken Wires: Visible breaks indicate significant weakening.

• Reduced Diameter: Wear can decrease rope diameter beyond safe limits.

• Core Failure: Internal damage not always visible externally.

Ignoring worn rope risks catastrophic failure, thiệt hại tài sản, and severe injury. Regular inspection and timely replacement are non-negotiable.

Safety requirements for replacing wire ropes

1. Ngắt kết nối sức mạnh: Physically unplug or lock out/tag out (TRÁI TIM) cái Hoạt vận động điện at the main power source. Verify it’s dead!

2. Lower Completely: Carefully lower the hook block until there’s absolutely no tension on the wire rope.

3. Secure the Load Block: Use a suitable sling or chain to securely support the hook block before cutting the old rope. Prevent uncontrolled falling!

4. PPE là bắt buộc: Wear heavy-duty gloves, kính an toàn, and steel-toe boots. Consider hard hats if working under the hoist.

5. Know Your Hoist: Consult the manufacturer’s manual! Procedures and parts (like the correct rope size, kiểu, and end termination) vary significantly between wire rope electric hoist mô hình.

6. Work Area: Ensure a clean, well-lit, and uncluttered space. Keep unauthorized personnel away.

Công cụ & Materials You’ll Need

• Manufacturer-approved replacement wire rope (Correct diameter, sự thi công, grade, and length)

• Wire rope cutters (Bolt croppers or specialized cutters)

• Heavy-duty cable ties or seizing wire

• Tape measure

• Marker/Paint Pen

• Appropriate wrenches/sockets (for securing pins or nuts)

• Manufacturer-specified socket/pin for the hook block termination

• Lubricant (if recommended by manufacturer)

• Rag/Shop Towels

• Safety Glasses & Heavy-Duty Gloves

• Hoist Manual (Essential!)

Steps to replace the wire rope of electric hoist

Giai đoạn 1: Removal of the Old Wire Rope

• 1. Secure & Identify Termination: With the hook block securely supported and no tension on the rope, locate where the rope end is fixed to the drum. This is usually under a clamp plate, held by a wedge socket, or secured with pins.

• 2. Release the Old Termination: Using the correct tools, carefully remove the bolts/clamp plate, wedge, or retaining pin securing the rope end to the drum. Note exactly how it was assembled.

• 3. Unspool Carefully: Slowly unwind the old rope from the drum. Pay attention to the direction it was spooled (clockwise or counter-clockwise) and the groove pattern. Guide it carefully to prevent kinking or uncontrolled whipping. Use cable ties to temporarily bundle sections.

• 4. Remove from Sheaves: Once the rope is completely off the drum, guide it out of the upper sheave(S) near the hoist body and the hook block sheave(S). Note the rope path precisely.

• 5. Dispose Safely: Coil the old rope securely using cable ties and dispose of it responsibly according to local regulations. Do not leave it lying around – it’s a tripping hazard and the broken wires are sharp.

Giai đoạn 2: Installing the New Wire Rope

• 1. Prepare the New Rope:

  • Check the new rope for damage during shipping.
  • Identify the correct end to attach to the drum (sometimes marked, or the “live” end might be specified).
  • Apply seizing wire or strong cable ties tightly around the rope about 2-3 rope diameters from the end that will attach to the drum. This prevents unlaying when you cut the factory binding.
  • Carefully cut the factory binding beyond your seizing.

• 2. Attach to the Drum:

  • Feed the prepared end of the new rope into the drum termination point, following the exact path and direction noted during removal.
  • Secure it using the original clamp plate, ổ cắm nêm, or pins. Torque all fasteners to the manufacturer’s specifications. This connection is critical! Ensure the rope end is seated correctly and fully.

• 3. Route Through Sheaves:

  • Carefully guide the rope through the upper sheave(S) on the hoist body, following the precise path of the old rope.
  • Continue routing it down through the sheave(S) on the hook block. Double-check the path ensures free movement without rubbing the hoist body or hook block.

• 4. Spooling Onto the Drum (Crucial Step!):

  • Direction is Key: The rope must spool onto the drum in the correct direction (usually indicated on the drum or in the manual). Spooling the wrong way causes immediate damage and unsafe operation.

  • Tension is Key: Apply firm, controlled tension to the rope as you slowly power the hoist to wind it onto the drum. You can often do this by hand-pulling down on the rope below the hook block while someone operates the “UP” control briefly and carefully. NEVER spool without tension – it will result in loose, overlapping wraps that crush and destroy the rope.

  • Level Winding: Ensure the rope winds evenly, side-by-side, filling the drum grooves neatly from one flange to the other. Avoid gaps or overlaps. Guide it if necessary (wear gloves!).

  • Spool Full Length: Wind the entire length of the new rope onto the drum until the hook block nears its highest point. Leave at least 1.5 – 2 full wraps of rope on the drum when the hook is at its lowest point (as per manufacturer spec, usually marked on the rope/drum). NEVER let the hook block reach the point where the rope termination could be pulled off the drum.

• 5. Secure the Load End:

  • Lower the hook block to a comfortable working height (still securely supported!).
  • Feed the free end of the rope through the specified termination point on the hook block (VÍ DỤ., a hole for a pin).
  • Apply seizing wire/cable ties 2-3 diameters from the end. Cut the rope cleanly beyond the seizing.

  • Install the manufacturer-specified socket, pin, or clamp to secure the rope end to the hook block. Torque to spec.

• Remove Support & Bôi trơn (If Applicable): Carefully remove the sling or chain supporting the hook block. Apply recommended lubricant to the rope if specified by the manufacturer (some pre-lubed ropes don’t need it immediately).

Giai đoạn 3: Post-Installation Checks & Kiểm tra

• 1. Kiểm tra trực quan: Double-check all terminations are secure, rope is correctly seated in all sheaves, and spooling on the drum is neat and even.

• 2. Operational Check (Không tải): Reconnect power. Slowly run the hoist through its full UP and DOWN range several times. Lắng nghe những tiếng động bất thường. Watch the rope spool on and off the drum smoothly and track correctly in the sheaves.

• 3. Light Load Test: Lift a very light load (significantly below capacity) several times. Observe operation.

• 4. Kiểm tra tải định mức (Critical!): Perform a test lift with a load at or near the hoist’s rated capacity. Consult your manual and safety regulations (like OSHA/ANSI or equivalent). This often requires formal documentation and specific procedures. Do NOT skip this step. It verifies the integrity of the installation under stress.

• 5. Final Inspection: After testing, inspect the terminations again and check the rope for any signs of unusual wear or damage from the initial runs.

Maintenance Tip: Regularly inspect your wire rope electric hoist rope according to the manufacturer’s schedule and applicable safety standards. Look for broken wires, chỗ gấp khúc, corrosion, diameter reduction, and improper spooling. Keep records of inspections and replacements.

Replacing the wire rope on your electric hoist is a vital maintenance task demanding respect, preparation, and strict adherence to safety protocols and manufacturer instructions. While this guide provides a general overview, your hoist’s specific manual is the ultimate authority. If you lack the proper tools, training, or confidence, always enlist a qualified technician. Properly installed and maintained wire rope is fundamental to the safe, có hiệu quả, and long-lasting operation of your wire rope electric hoist. Don’t cut corners – prioritize safety above all else.