Abstract:
A control system for a super-lifting device of a crane comprises a pressure-detecting element (21) for detecting the pressure of a variable amplitude oil cylinder and obtaining a measured pressure value, and a control element (22) for comparing the measured pressure value with the predetermined pressure value. When the measured pressure value is larger than or equal to the predetermined pressure value, the tensioning oil cylinder (23) is shortened, therefore increasing the tensioning pressure of the tensioning oil cylinder (23), reinforcing the tension of the super-lifting cable wire in the super-lifting device, and increasing the super-lifting moment applied to the main arm by the super-lifting device, which can effectively balance the pressure of the variable amplitude oil cylinder. A control method and a super-lifting device with the above control system are disclosed.
Abstract:
A medical drill is disclosed, which is made of amorphous alloy, the amorphous alloy is zirconium amorphous alloy comprising 45 at % or above of zirconium, wherein the tensile strength of the medical drill is 1500-2500 Mpa, and the Vicker's hardness of the medical drill is 400-750. Moreover, a medical drill made of titanium amorphous alloy is also disclosed.
Abstract:
A device includes a mounting apparatus and a supporting apparatus. The mounting apparatus includes a fixing bracket, an engaging member slidably mounted to the fixing bracket, and an operation member mounted to the engaging member. The fixing bracket defines first and second engaging holes. The supporting apparatus includes a connecting bracket detachably mounted to the fixing bracket. The fixing bracket defines a connecting hole. The connecting bracket comprises a hook. The engaging member comprises a stop piece. The operation member forms a projection. When the engaging member is slid to engage the projection into the first engaging hole, the stop piece moves away from the connecting hole and the first hook extends through the connecting hole. The engaging member is slid to engage the projection in the second engaging hole, the stop piece moves between the connecting hole and the hook to engage with the hook.