{"id":8482,"date":"2026-03-30T17:40:56","date_gmt":"2026-03-30T09:40:56","guid":{"rendered":"https:\/\/www.wtauserver.com\/?p=8482"},"modified":"2026-03-30T17:40:56","modified_gmt":"2026-03-30T09:40:56","slug":"composition-working-principle-and-wiring-method-of-heavy-hammer-limit-switch","status":"publish","type":"post","link":"https:\/\/www.wtauserver.com\/en\/composition-working-principle-and-wiring-method-of-heavy-hammer-limit-switch\/","title":{"rendered":"Composition, principle and wiring method of hammer limit switch"},"content":{"rendered":"
Hammer limit switch<\/strong>(Also known as anti-rollover switch, hammer-type height limiter) is a kind ofMechanically triggered safety protection switch<\/strong>, Widely used in cranes, electric hoists and other lifting equipment, the core role isPrevent the hook from rising too high (rushing to the top)<\/strong>, To avoid breaking the wire rope, damaging equipment or causing safety accidents.<\/div>\n
\"Internal<\/div>\n

1. Structure composition<\/h3>\n
It is mainly composed of three parts\uff1a<\/div>\n
    \n
  1. Limit switch body<\/strong>: Contains micro-moving contacts, lever \/swing arm mechanism.<\/li>\n
  2. Heavy hammer<\/strong>: Heavy metal objects, providing gravity trigger force.<\/li>\n
  3. Connecting wire rope \/ tie rod<\/strong>: Connect the hammer to the switch swing arm.\n
    \"Installation<\/div>\n<\/li>\n<\/ol>\n
    <\/div>\n

    Second, the working principle<\/h3>\n
    Core logic: the gravity of the hammer maintains the switch closed; the hook supports the hammer\u2192 the switch is disconnected\u2192 the rising circuit is cut off.<\/strong><\/div>\n
      \n
    1. Normal working condition<\/strong>\n
      <\/div>\n

      The hammer sagges freely due to its own weight, and the swing arm\/lever of the switch is tightened downwards through the wire rope, so that the inside of the switchNormally closed (NC) contacts remain closed<\/strong>, The rising control loop is energized, and the hook can be raised and lowered normally.<\/li>\n

    2. Trigger protection status<\/strong>\n
      <\/div>\n

      When the hook rises to the setLimit height<\/strong>When the hook pulley block will be directlyLifting hammer<\/strong>, The connecting wire rope is relaxed, and the switch swing arm is reset under the action of an internal spring\uff0cNormally closed contact disconnected<\/strong>.<\/li>\n

    3. Protection effect<\/strong>\n
      <\/div>\n

      Contact disconnected \u2192 Cut off the coil loop of the ascending contactor (KM)<\/strong> \u2192 Power off on the ascending main circuit \u2192 HookStop rising immediately<\/strong>\uff1bThe descending loop is not affected<\/strong>, You can still operate downwards.<\/p>\n

      <\/div>\n

      Key features<\/strong>\uff1aOnly protect the rising limit<\/strong>, Unable to control the drop limit.<\/li>\n<\/ol>\n

      <\/div>\n

      3. Wiring method (general standard)<\/h3>\n
      Hammer limit switch usually has 3 terminal blocks<\/strong>\uff1aCommon terminal (C), normally open (NO), normally closed (NC)<\/strong>.<\/div>\n
      \"Wiring<\/div>\n

      1. Standard safe connection method (normally closed series, most commonly used)<\/h4>\n
      Lifting safety specification requirementsNormally closed contacts (NC) must be used<\/strong>, The highest reliability.<\/div>\n