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。
Auto power control, frequency auto-adjustment and load balance make it more flexible and stable to establish large scale network.
自动电源控制，频率自动调整负载平衡，使其更为灵活和稳定，建立大规模的网络。
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