38results about How to "Reduce mechanical fatigue" patented technology

A turbine engine blade having a plurality of blade sections stacked along a radial axis between a root and a tip. Each section extends along a longitudinal axis between a leading edge and a trailing edge, and along a tangential axis between a pressure-side face and a suction-side face. Each section presents a camber line, a deviation defined for each section as the difference between an angle between the tangent to the camber line at the leading edge and the longitudinal axis, and an angle between the tangent to the camber line at the trailing edge and the longitudinal axis. The minimum deviation is at the root of the blade, and the maximum deviation is present at sections situated in the range 0.3H to 0.8H, where H is the height of the blade measured from its root to its tip.

A tube connection assembly of a bicycle frame includes a bi-forked portion formed by a hollow rectangular tube; one end of the rectangular tube being bi-forked as two halves; each half having a positioning groove; and a combining portion formed by two plates which are connected as a shape corresponding to that of the positioning groove and the bi-forked portion so that in assembly the combining portion is assembled to the bi-forked portion; and connection area of the bi-forked portion and combining portion being welded.

The invention relates to the technical field of coil shaping devices. The invention particularly relates to a coil shaping device for a motor. The coil shaping device comprises a motor support platform, the motor supporting platform comprises a bearing platform, a motor main positioning mechanism, a motor auxiliary positioning mechanism and two coil knocking mechanisms. The motor main positioningmechanism comprises a side end fixing rod, a side end movable rod, two first working motors and a motor supporting block; the motor auxiliary positioning mechanism comprises a longitudinal fixing rod,a transverse positioning rod, an auxiliary fixing plate and coil positioning nuts; and each coil knocking mechanism comprises a hydraulic oil cylinder, a supporting plate, a second working motor anda rolling shaft. According to the invention, it is ensured that each coil of the motor can be shaped, the shaping quality of the motor coil is improved, the motor is prevented from deviating in the rotating shaping process, and the rotating shaping process of the motor is stable and reliable.

A mobile unit for transportation of at least one passenger comprises a car accommodating this passenger and an assembly device for fitting this car on a mobile support in rotary manner with respect to a substantially horizontal axis of rotation. The assembly device comprises a single first crown rigidly secured to the car and assembled by a bearing to a second crown performing securing to the mobile support.

A repeater mechanism includes: an hour part, which is mobile between a resting position and a reading position; an hour spring that returns the hour part towards its reading position; a chain that is hooked to the hour part; a barrel that includes a shaft, a drum, a spring, a pulley that is mobile in rotation relative to the shaft and on which the chain is hooked, and also a ratchet that is integral in rotation with the barrel shaft and coupled to the pulley as long as the hour part exerts a traction force on the chain, and uncoupled from the pulley as soon as this traction force is cancelled out; and a pulley spring that is interposed between the ratchet and the pulley.

The present invention is to provide a device of a pair of claw-type rotors having same profiles, the device includes a defined rotor and a conjugate rotor intermeshing with and conjugating to each other. The defined rotor includes a first claw having a cross-section profile having an epicycloid, a first arc, a second arc, a third arc, and a fourth arc all connected together in sequence in a counterclockwise direction. The first, second, third, and fourth arcs are connected with slope continuity, whereby locations of centers, values of radiuses and arc angles of the second and third arcs are capable of being defined in accordance with the slope continuity and geometric relations between the first and fourth arcs. The conjugate rotor has a first claw having a cross-section profile generated by utilizing a conjugate curve corresponding to the first claw of the defined rotor.

The invention relates to a wind generation set deloading control method. The method comprises the steps that whether a current feedback value of a variable pitch motor is larger than a set parameter value Ir or not is judged at first; if yes, a wind generation set runs in a semi-control mode, in other words, when the practical feedback current of the variable pitch motor is larger than the reference value Ir, the variable pitch motor is controlled to carry out output according to the reference value Ir, and meanwhile, double closed loop control is canceled; after continuous running is carried out for the set time T, whether the phenomenon that blades are nonsynchronous exists or not is judged; and when the angle difference of every two adjacent blades exceeds a set angular deviation, the blades are in the nonsynchronous state, a blade cooperation mechanism is executed, the blade with the largest angle is used as the reference, and the other two blades are controlled to keep the same angle as the blade. Due to the fact that the semi-control mode is added, when large turbulent flow appears, the problems that execution of a variable pitch system lags and the wind generation set is overspeed are solved. The variable pitch nonsynchronous phenomenon existing during operation in the semi-control mode is avoided through the blade cooperation mechanism.

The invention relates to an intelligent control method of an electrified operation mechanism of a high-voltage switch. The method includes the steps of importing configuration files and historical data of a motor to form a stepping curve in the motor transmission and energy storage process in a fitting mode, monitoring the real-time process amount of the motor and the dynamic process of switching on and switching off of the switch, performing analysis in combination with the stepping curve of the transmission motor to obtain a soft contact signal of the position of the switch and a soft contact signal of energy storage of a spring, if the switch operation is not in place and a hard contact signal of the switch is consistent with the soft contact signal, calculating and outputting the position of a movable contact of the switch and the triggering angle of a rectification power supply of the transmission motor, and returning to the step of monitoring the real-time process amount of the motor and the dynamic process of the operation mechanism. While self-diagnosis is achieved, speed changing control is performed on the motor, the phenomena such as coil burnt damage caused by frustration of an operation process or being not in place of the opening state are avoided, and the motor is protected to the maximum. The intelligent operation of the operation mechanism can be achieved without changing the original structure, and the method is easy and convenient to use and high in performance cost ratio.

The invention provides a hydraulic tension clamp, which relates to the technical field of electric power fittings. The tension clamp designed by the invention is provided with a buffer device for buffering a mounting plate. The buffer device is placed on the extrusion plate and is symmetrically arranged. A protection device is also provided at the connection between the first flow guide plate and the second flow guide plate, and the protection device can be extended and retracted to protect the connection between the first flow guide plate and the second flow guide plate.