Balance weight set free fall emergency braking device, which can realize auto control load loss protection, when the wellhead end accidental loss of load, balance weight free fall.

平衡重设置自由落体紧急制动装置，可实现井口端意外失载后平衡重自由落体坠落不能人控，却能自控失载保护的万无一失。

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Adopt mechanical air-bag balance device to balance weight of he slide and the upper die so than machine operates more smoothly.

采用机械式气囊平衡装置，平衡滑块和上模重量，使机床运行更平衡。

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The present invention discloses a crane comprising a bipod and a balance weight hoisting device.

本发明公开了一种起重机，包括人字架和配重提升装置；

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