3 results about "Fatigue damage" patented technology

The embodiment of the invention discloses an elastic balance mechanism and an elastic balance type double-acting valve. The elastic balance mechanism may comprise an elastic balance cylinder, a valvecylinder and a power source providing assembly. According to the elastic balance mechanism, when a power source is stable, an elastic piece keeps compressed under the action of the elastic balance mechanism, and a pneumatic valve or an oil pressure valve has normal double-acting opening and closing functions; when the power source is unstable or lost, the elastic piece is expanded immediately under the action of the elastic balance mechanism, and the pneumatic valve or the oil pressure valve is at a fault closing (FC ) position or a fault opening (FO) position; and at the moment, in cooperation with the power-on position and the power-off position of a solenoid valve, the valve can select multiple states such as fault positions of FLC, FLO, EFC and EFO. The elastic balance mechanism in theembodiment can be widely applied to valves such as a stop valve, a butterfly valve, a ball valve, a gate valve and a regulating valve, and is used for coping with the restriction of dangerous workingconditions of air shortage of double-acting valves and the risk of fatigue damage to springs of single-acting valves.

A system for monitoring fatigue of a mechanical structure includes a memory (101) that stores response values, each response value relating to one of predetermined stress ranges and one of predetermined average stresses. Each response value represents an upper limit of the number of stress cycles at a predetermined observation point of the mechanical structure in a case where the cycles have a stress range and an average stress associated with the response values. The system comprises a processing device (103) for updating, for each response value, a stress history value representing a number of cycles occurring in a time trend of stress and having a stress range and an average stress associated with the response value. And updating the fatigue damage sum based on the response value and the stress history value. The sum of fatigue damage represents cumulative fatigue damage of the mechanical structure and may be used for real-time fatigue monitoring.

The invention relates to a trimming mold for a car rear wall outside plate. The mold comprises an upper mold holder and a lower mold holder which is matched with the upper mold holder, an upper mold trimming insert is arranged on the lower surface of the upper mold holder, a lower mold trimming insert is arranged on the lower mold holder, the mold further comprises a pressing plate which is movably arranged between the upper mold holder and the lower mold holder in the vertical direction and a pressing plate driving mechanism which is in transmission connection with the pressing plate, a pressing plate connecting pin is arranged between the pressing plate and the pressing plate driving mechanism in the horizontal direction, and the pressing plate is fixedly connected with the pressing plate driving mechanism through the pressing plate connecting pin. Compared with the prior art, the vertical discharging screw hanging connection manner is replaced with the horizontal pressing plate connecting pin connection manner, whole pressure bearing is achieved through a pin rod of the pressing plate connecting pin, the problem that due to thread repeated pressing of a discharging screw, fatigue damage is caused is solved, long-time stable work of the pressing plate is ensured, the service life of the mold is prolonged, and safety and reliability are achieved.