Hook consists mainly of the bail, the bail pedestal, cylindrical shell, hook body, hook lever, and spring, etc.
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The inner and outer springs are mounted inside the cylindrical shell, which enable stand to upspring after it is free. A Safety positioning device is mounted upper the cylindrical
shell.
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The positioning device can prevent the hook body from rotating when the empty elevator is hoisted. The positioning device will not work when the drill string is hanging.
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The hook body can rotate freely. Hook’s braking device can lock the hook body at any eight even distributed position.
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Hook’s safety pin body is locked by locking mechanism too.
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A hydraulic cushion device is mounted inside the rotary hook to protect the drill pipe joint during brake-out.
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A reliable safety device is mounted at the mouth of hook. The nondestructive inspection (NDI) was conducted against the main loaded component of hook.