Power tong
    1.
    发明授权
    Power tong 失效
    动力钳

    公开(公告)号:US6082224A

    公开(公告)日:2000-07-04

    申请号:US802629

    申请日:1997-02-19

    IPC分类号: B25B1/24 E21B19/16 B25B17/00

    摘要: A new power tong for rotating tubular members for make-up (connection) and break-out (disconnection) operations. In one aspect such a tong has at least one movable jaw with a smooth surface gripping element thereon and pre-load apparatus for applying a pre-load force to a movable jaw so that the jaw does not slip on a tubular to be rotated and so it does not mark or damage the tubular. In one aspect the pre-load apparatus includes a first pre-load device at one end of a movable jaw for breakout operations and a second pre-load device at another end of the jaw for make-up operations. In one aspect a power tong which has unique smooth surfaced jaw inserts made, e.g., of aluminum. In one aspect a single pivotable pre-load cylinder, fixed to rotary, pivots for pivotable connection to one jaw or the other. This can be done manually or a powered smaller piston/cylinder may be used to pivot the pre-load cylinder. In one aspect a jaw unit which comprises a jaw holder and a jaw movable with respect to said jaw holder, characterized in that said jaw is slidably mounted on said jaw holder.

    摘要翻译: 一种用于旋转用于化妆(连接)和断开(断开)操作的管状部件的新动力钳。 在一个方面,这种钳具有至少一个具有光滑表面抓握元件的可动夹爪和用于向可动夹爪施加预加载力的预加载装置,使得夹爪不会在管状上滑动以旋转,因此 它不会标记或损坏管状物。 在一个方面,预加载装置包括用于突出操作的可动夹爪的一端处的第一预加载装置和用于补充操作的钳口的另一端的第二预加载装置。 在一个方面,具有例如由铝制成的独特的平滑表面的钳口插件的动力钳。 在一个方面,固定到旋转的单个可枢转的预加载缸枢转以枢转连接到一个钳口或另一个。 这可以手动完成,或者可以使用动力较小的活塞/气缸来枢转预负载气缸。 一方面,一种钳口单元,其包括钳口保持器和相对于所述钳口保持器可移动的钳口,其特征在于,所述钳口可滑动地安装在所述钳口保持器上。