484results about How to "Avoid fatigue damage" patented technology

The invention provides concrete integral pouring construction method and device for a road inspection well. The method comprises advance constructions and post constructions, wherein the advance constructions comprise the following steps of: measuring and paying off; excavating a wellhole; pouring a reinforced concrete foundation bottom and building a wellhole protection wall; connecting pipelines; building a well chamber; mounting a tread; backfilling well perimeters; reserving a branch pipe; building a close up section; mounting a cover plate; building the wellhole; covering and protecting; backfilling cement and stone dust to the well perimeters; and constructing a pavement basic layer. The post constructions comprise the following steps of: excavating the pavement basic layer covered on the wellhole to expose the wellhole, dismantling the cover plate and excavating a concrete foundation pit by using the wellhole as a center, wherein the radius of the excavated foundation pit two times larger than or equal to that of the wellhole; laying reinforcing steel bars in the foundation pit and supporting an inner mold in the wellhole; overhanging a well cover on the wellhole by a fixing bracket overhanging device; adjusting the altitude of the well cover; pouring concrete into the foundation pit and keeping the height of the concrete parallel to the bottom of the well cover; building the perimeters of the well cover into a cement slope by concrete; carrying out acceptance checks; paving a bituminous pavement on the perimeters of the well cover and keeping the bituminous pavement parallel to the well cover.

The invention discloses an efficient fluid finishing method based on the structure cavitation effect. According to the efficient fluid finishing method, the Venturi tube cavitation effect is introduced to fluid finishing, strong bubble cavitation action is formed in the effective polishing area formed between a processing tool and a workpiece to be processed by arranging a Venturi tube structure on the processing tool, and the bubble cavitation action is utilized to drive a liquid-solid abrasive flow in the formed effective polishing area to move in a high-speed turbulent vortex mode to achieve processing on the surface of the workpiece to be processed through abrasive particles. According to the efficient fluid finishing method based on the structure cavitation effect, the Venturi tube structure is utilized to achieve growth and collapse of bubbles in the microspur gap between the processing tool and the workpiece to be processed so as to achieve unordered and high-speed turbulent flow of the abrasive particles; compared with processing equipment adopting ultrasonic waves, the structure is simpler and the cost is lower; and compared with normal bubble-free-collapse processing equipment, the controllability is better, and the bubble collapse driving effect is more obvious.

A method for controlling a drive system of a vehicle, the drive system including a combustion engine with an output shaft, a gearbox with an input shaft, an electrical machine including a stator and a rotor, and a planetary gear with a sun gear, a ring gear and a planet wheel carrier. The combustion engine may be active or inactive. A braking device may be active or passive. The planetary gear may be released or locked. The method includes arranging the planetary gear in the released state, the combustion engine in inactive state, the braking device in active state, and, when information on a requested torque for the operation of the vehicle is received, controlling the electrical machine to provide the requested torque with the combustion engine inactive, the braking device active and the planetary gear released.

The invention provides a method for monitoring vibration and strain of key parts of a full-face rock tunnel boring machine and belongs to the technical field of real-time monitoring of underground construction for full-face rock tunnel boring machines. The invention is intended to provide a monitoring device and an all-weather monitoring warning system thereof. A vibration and strain sensor and a wireless data transmission system therein are used to acquire monitoring data in order to provide long-term real-time monitoring for vibration and strain states of key parts of a TBM (tunnel boring machine) main unit system during operating, operators can be reminded of performing maintaining in time, fatigue damage of key weak parts of the TBM main unit system is prevented, and operational safety and reliable of the TBM are ensured. The invention also provides a method for evaluating strain state of parts unable to be measured, namely, an equivalent mapping method. Therefore, a complete system for monitoring vibration and strain of key parts of the TBM main unit system in the whole process is constructed.

The invention discloses an anti-typhoon and anti-leakage metal roof system. The metal roof system sequentially comprises a main steel structure, main roof purline, secondary roof purline, pressed steel bottom plates and purline laid on the pressed steel bottom plates from top to bottom. A plurality of fixed seats are fixed to the purline at intervals, concave roof plates which are engaged with thefixed seats are arranged between the fixed seats, and multiple layers of sound-insulation and vapor-proof thermal insulation materials are laid on the pressed steel bottom plates. The fixed seats include fixed supporting seats and panel engaging plates, wherein the purline is fixedly connected with the lower ends of the fixed supporting seats; the panel engaging plates are fixedly connected withthe fixed supporting seats, and small angles are formed between the panel engaging plates and the fixed supporting seats in the length direction of the roof plates so that the panel engaging plates and the fixed supporting seats can rotate relatively; and panel engaging parts are formed in the upper parts of the panel engaging plates, and the panel engaging parts and both side edges of the roof plates form engaging connection. The anti-typhoon and anti-leakage metal roof system solves the problems that a traditional metal roof system with vertical lockrands has low wind resistance, and is prone to leaking and prone to producing expansion deformation damage, and the safety of upper supporting facilities is affected.

A rotating electrical machine includes a rotor core, a rotor shaft, a coil, a bind, a lead-out wire of which one end is connected to the coil and the other end is connected to a neutral ring. A filling is filled between the coil and the neutral ring. The neutral ring is formed with a plurality of members that are connected with one another to have flexibility.

The invention relates to a pretension and lay-off method of a crane jib for a ship, belonging to the technical field of a crane. The crane comprises a luffing mechanism composed of a top pulley block, a jib, a winch, a luffing wire rope and a jib head pulley block and a bracket. The method comprises the following steps: A. operating the winch in the forward direction, loosening the jib and layingoff the jib onto the bracket; and B, operating the winch in the reverse direction, pulling the jib upwards to enable the pressure of the jib on the bracket to be less than the pressure on the bracketbefore being subjected to the upward pull, and stopping and shutting off the winch. The invention also relates to a pretension and lay-off device of a crane jib for a ship. The luffing mechanism alsocomprises a middle pulley arranged at the middle of the jib, and the luffing wire rope is connected with the jib head pulley block and the middle pulley through the top pulley block. The pretension and lay-off method and device of a crane jib for a ship can produce a pretension force on the jib by means of the luffing wire rope, thereby reducing the self-weight load of the jib as well as the influence and the destruction on the jib structure as a result of the shock load and the changing load of the bracket on the jib. Besides, the invention has the advantages of simple method and structure, convenient operation and low cost.

The invention relates to a vibration isolation coal cutter, which comprises a cutting mechanism and a body, wherein a buffer mechanism is arranged between the cutting mechanism and the body; the body comprises a traction box; the traction box is provided with a guide piece; the buffer mechanism is provided with a guide sleeve matched with the guide piece; and a buffer is arranged between the guide piece and the guide sleeve. According to the vibration isolation coal cutter, the impact vibration generated by a cutting part can be isolated, the impact on a traction part and the body is reduced, each connecting and fixing piece is prevented from loosening, the fatigue damage of each connecting piece is avoided, the failure rate of the coal cutter is reduced, and the working efficiency of the coal cutter is improved.

The invention belongs to the technical field of structure vibration control and discloses an ultralow frequency swinging type tuning mass damper and an achieving method thereof. The novel tuning mass damper is formed through an added negative stiffness adjusting device with a novel structure, meanwhile, the achieving method of the tuning mass damper is disclosed, accordingly the swinging length of the ultralow frequency swinging type tuning mass damper (TMD) can be effectively shortened, the mounting space of the TMD is decreased, and the engineering application range of the ultralow frequency swinging type TMD is expanded.

A method for minimizing fatigue damage in a welded structure by minimizing the fatigue damage produced in the welded portion of the welded structure. In this method, a substantially linear weld bead is curved in an arc-shape along a direction that transverses the weld bead at a right angle on the surface of a base material adjacent to the bead in the welded portion, and a strike mark is formed through hammer peening or ultrasonic shock peening using a tool for forming a strike mark having at the tip a strike-mark-forming surface with the center of curvature skewed to one side of two end surfaces mutually parallel along the weld bead; a strike mark is formed on the surface of the base material adjacent to the substantially linear and curved weld bead through hammer peening or ultrasonic shock peening using a tool for forming a strike mark having at the tip a planar strike-mark-forming surface with an overall circular or elliptical shape; and fatigue damage on the welded portion is minimized by introducing compressive residual stress in the vicinity of a weld bead toe with the tool for forming a strike mark.

The invention discloses a hydraulic clutch brake device of a punch press and relates to improvement of the hydraulic clutch brake device of the punch press. According to the hydraulic clutch brake device of the punch press, a forward driving mechanism and a reverse driving mechanism are integrated, so that the whole structure is simple, the stress state can be improved, and the service life of parts can be prolonged. The punch press comprises a machine body, a flywheel, a crankshaft and a hydraulic source, the hydraulic clutch brake device is arranged between the crankshaft and the flywheel, a brake ring is fixedly arranged on the machine body, a hydraulic cylinder is connected with an operating ring through an axial opening/closing moving driving mechanism, the axial opening/closing moving driving mechanism comprises a piston rod, a piston and a return spring, and the piston rod also serves as a return guide rod. According to the hydraulic clutch brake device of the punch press, the return rod and the piston rod are integrated, and in order to ensure that the separation is clear, a clutch plate of the device and the flywheel of the device are connected through a steel spring plate, so that the clutch plate is effectively separated from a starting friction plate.

The invention discloses a heavy truck fuel tank oil shaking characteristic testing device and method, and belongs to the technical field of oil tank testing. The device comprises a power unit and a test piece connecting unit, the power unit comprises a bottom frame and a driver, the bottom frame is fixedly arranged on the ground, the driver is installed on the bottom frame, and a reciprocating transmission mechanism is arranged at the output end of the driver; the test piece connecting unit comprises a sliding bracket, a fixed bracket and an oil tank connecting piece; the sliding support is slidably arranged on the bottom frame, the sliding bracket is movably connected with the reciprocating transmission mechanism; first hinge supports are fixedly connected to the middle positions of the front side and the rear side of the sliding bracket, second hinge supports are fixedly connected to the middle positions of the front side and the rear side of the fixed bracket, the two second hinge supports and the corresponding first hinge supports are jointly connected with connecting pins, an elastic buffer structure is connected between the fixed bracket and the sliding bracket, and the oil tank connecting piece is fixedly installed on the fixed bracket. The motion condition of the fuel tank of the heavy truck is truly simulated, and a positive effect is achieved for the structural improvement or research and development of the fuel tank.

The invention relates to a two-stage double-spring direct relief valve and a control method thereof. The two-stage double-spring direct relief valve comprises a valve body internally provided with an oil inlet and an oil outlet. A valve seat is sleeved with the valve body in a sliding manner. A valve element is sleeved with the valve seat in a sliding manner. The width of the upper portion of the valve element is smaller than that of the middle of the valve element. The lower portion of the valve element is conical, the conical lower portion of the valve element is in matching connection with a conical hole penetrating the bottom of the valve seat, and the conical hole is communicated with the oil inlet. A second damping hole and a first damping hole are sequentially and vertically formed in the two sides of the valve seat in a transverse penetrating manner respectively. A pressure adjusting screw is further included and arranged at the top end of the valve body and is in threaded fit with the inner side of the valve body. An outer pressure adjusting spring is arranged in a rod portion of the pressure adjusting screw in the length direction, an inner pressure adjusting spring is coaxially sleeved with the outer pressure adjusting spring, and one end of the inner pressure adjusting spring is connected with the top end of the valve element. The two-stage double-spring direct relief valve has the beneficial effects that collisions between the valve body and the valve seat can be reduced, and the service life of the valve can be prolonged.

The invention discloses a stably-operating adiabatic compressed air storage power generation method and system. The technical scheme is as follows: when a power grid is in a valley load, by using a sinuous coil heat pipe exchanger arranged at a gas storage chamber and a countercurrent gas-liquid heat pipe exchanger arranged at an outlet of a gas compressor, through forced circulation, compression heat in a gas compression and energy storage process is absorbed by steps, and the absorbed heat is stored in the heat storage device; and when the power grid is in a peak load, the heat of the heat storage device is released, by using a gas release countercurrent gas-liquid heat pipe exchanger arranged at a turbine motor inlet and the sinuous coil heat pipe exchanger arranged at the gas storage chamber, through forced circulation, the temperature of a gas entering a turbine motor is increased, expansion cold of the gas storage chamber is absorbed, and the temperature of the gas storage chamber is kept relatively stable. According to the stably-operating adiabatic compressed air storage power generation method and system, the compression heat in a gas compression and energy storage process and expansion cold generated in a gas release and power generation process are absorbed by steps, thus a constant temperature of air in the gas storage chamber can be kept, the whole operation efficiency of the system is improved, the safety of the gas storage chamber can be ensured, and continuous and stable operation of a unit is ensured.

The invention relates to a buffering guide method by reciprocating impact reactive force and a vibration isolation mining machine. The vibration isolation mining machine comprises a lifting part, a reciprocating impact part, a machine body and a traveling part, wherein a buffering device is arranged on the lifting part or between the lifting part and the machine body or between the lifting part and the reciprocating impact part; the impact reactive force is applied on a buffering supporting piece and a fixed supporting piece or a buffering guide sleeve and a buffering guide piece; the buffering piece is deformed to absorb the impact reactive force; a direction guide piece controls a buffering direction to be reciprocating linear buffering, so that non-directional swinging of the buffering piece is prevented, and the buffering piece is prevented from being separated from the lifting part or the machine body; and impact vibration produced by a cutting stop part can be isolated; impact on a traction part and the machine body is reduced; looseness of connection fixing pieces is prevented; fatigue damage to the connection pieces is avoided; the fault rate of the mining machine is reduced; and the working efficiency of the mining machine is improved.

The invention discloses a hole flanging die. The hole flanging die comprises a male die body fixedly connected to an upper die base, and a female die sleeve fixedly connected to a lower die base and matched with the male die body. The male die body comprises a hole flanging part close to the upper die base, and a punching part far away from the upper die base, and the female die sleeve is matched with the punching part. The hole flanging die further comprises a movable limiting mechanism, the female die sleeve moves in the opening and closing direction of the die through the movable limiting mechanism and is fixed to the preset position, and when the female die sleeve is located at the lower limit position, a preset distance is formed between the upper end face of the female die sleeve and the lower end face of the hole flanging part. Accordingly, the hole flanging die can achieve the pre-punching and hole flanging procedures in the same die, and therefore the usage amount of the die is reduced, the tool cost of the die is reduced, the production cost is reduced, and the production efficiency is improved.