44results about How to "Steady descent" patented technology

A lifting device with a head cavity in the lifting member shaped to accept a removable lifting head. The head cavity in the lifting device—e.g., the piston of a bottle jack—may be provided with threads, or may have the threads removed. A yoke fitted on the lifting head provides registration, horizontal restraint, or both against a lifted object, component, or surface to prevent sliding off the lifting head while in use. In a smooth-walled-shaft embodiment, a set of risers (spacers, adjusters, trims, or shims) serves to adjust an extension height of the shaft, elevating the lifting head with respect to the piston prior to beginning to lift the hydraulic piston.

The invention relates to a lifting device, in particular to a three-point type lifting device for down-hole detection. The three-point type lifting device comprises a driving motor, winding drums, lifting synchronous belts, synchronous belt wheels, a speed measurement encoder, a touch screen and a detection base. The driving motor drives the winding drums to rotate. The three lifting synchronous belts are wound on the three winding drums correspondingly. The synchronous belt wheels are arranged below the winding drums and matched with the lifting synchronous belts in a perpendicular manner. The lifting synchronous belts are in three-point type uniform distribution through guiding of the synchronous belt wheels. The synchronous belts are connected with the detection base at the same time so that stability of the detection base achieved in the lifting and descending processes can be improved. The speed measurement encoder is used for measuring rotating speed of the synchronous belt wheels and feeding measurement signals back to a control system. Through the driving motor, rotating speed of the winding drums is controlled in real time, so that the detection base is lifted and descended at the constant speed; and all operations of the device are completed on the touch screen. Meanwhile, the synchronous belts are adopted for replacing steel wire ropes, so that a wire arrangement mechanism for winding of the winding drums is omitted; and complexity of the lifting device is lowered.

The invention relates to a hydraulic damping high-rise escape descent control device which consists of a drum wheel (1), a wire rope (2), an overrunning clutch (3), a hydraulic damper (4), a shell (5), a hoisting mechanism (6) and an escape descent control device fixing member (7). When a fire breaks out in a high-rise building, and all exits are closed off by the fire, the men in the scene of a fire have to take the way of escaping from windows or balconies into consideration, the device provided by the invention enables the men to decline slowly in the process of high-rise escape so as to prevent the men from injuries, and the hydraulic damping escape descent control device is used as a resistance source for the wire rope, so that the men can decline slowly in the process of escape; andthe device has the advantages that the structure is simple and the descent velocity is not proportional to the hanging gravity, so that whether children or adults, one or two men are hung on the wirerope, a relatively stable descent velocity can be obtained, thereby providing an escape shortcut for the distress callers in the scene of a fire.

The invention provides a control device for a hydraulic winch and an engineering machine. The control device comprises a motor, a back pressure valve and a flow regulation valve, wherein the motor is connected with the hydraulic winch, and comprises a loading cavity and a descending cavity; and the loading cavity is connected with the back pressure valve, the flow regulation valve and an oil tank sequentially. According to the control device, the flow regulation valve is used for regulating the flow of hydraulic oil discharged from the loading cavity of the motor, so that the control on a descending speed is realized, the speed of slow descending is controlled stably, and the control is more stable and reliable.