1087 results about "Inertia force" patented technology

A work apparatus includes: a housing; a motor support unit designed separately from the housing, the housing being fixed to the motor support unit. A drive motor is designed as an electric motor for driving a tool and is attached to the motor support unit. A receptacle housing designed separately from the motor support unit for receiving at least one battery pack for supplying the drive motor with electrical power is fixed to the housing. The receptacle housing and the motor support unit are designed and arranged relative to each other in such a way that the receptacle housing is able to move relative to the motor support unit in order to reduce, in particular to prevent, direct transmission of inertial forces emanating from the receptacle housing to the motor support unit in the event of an impact load on the work apparatus.

The invention relates to the technical field of life evaluation, in particular to a turbine blade life evaluation method which comprises the following steps: acquiring surface temperature gradient data of a turbine blade of a gas turbine, extracting the temperature change rate of each area of the blade, analyzing the influence of the temperature change rate on the local stress of the blade, and evaluating the life of the turbine blade. And calculating a thermal stress synthetic effect by combining the blade rotation inertia force and the aerodynamic load to obtain blade thermal stress distribution data. According to the method, the thermal stress synthesis effect is calculated by acquiring the temperature gradient data of the surface of the blade and combining the rotary inertia force and the aerodynamic load, the thermal stress distribution characteristics of the blade in different operation states can be accurately reflected, and the life attenuation rate is calculated by combining the current working condition, so that life prediction can be adjusted along with the operation states; the service life offset is calculated by analyzing the influence of the start-stop load of the gas turbine and comparing creep fatigue joint distribution, so that the influence of the running state of the gas turbine on the service life prediction can be dynamically updated in real time.

The invention provides a strong nonlinear simulation method and device suitable for a large floating fan, and the method comprises the steps: dividing a target floating fan into a plurality of body structures according to the model parameters of the target floating fan, so as to construct a multi-body model containing a plurality of degrees of freedom, and building a whole machine load and a motion transmission path; the aerodynamic load input of each body structure is calculated, and the nonlinear dynamic response of the blade is calculated according to the aerodynamic load input of each body structure; according to the coordinate transformation relation, the nonlinear dynamic response of the blade is converted into a whole coordinate system and input into a multi-body dynamic model of the whole machine, generalized active force and generalized inertia force of each body structure in the target floating type draught fan are obtained through calculation, and the motion response of each body structure of the target floating type draught fan is obtained through simultaneous solution. According to the scheme, the motion response of each body structure of the target floating fan can be accurately determined, so that the running state of the floating fan in the deep and far sea complex environment can be accurately evaluated.

The invention belongs to the technical field of underground structure tests, and provides a deep underground structure pseudo-dynamic test method and device.The method comprises the steps that a numerical substructure and a test substructure are constructed, and an interaction boundary is arranged between the numerical substructure and the test substructure; and compensating the boundary prediction data according to the inertia force compensation coefficient based on the numerical sub-structure in each loading process, and loading the compensated prediction data to the test sub-structure, so that the test sub-structure outputs prediction response data and updates the rigidity of the numerical sub-structure, and determining a target balance force according to the prediction response data based on the numerical simulation substructure, driving a next loading process by using the target balance force, and obtaining a dynamic response rule of the soil-structure system when respective boundaries of the numerical simulation substructure and the test substructure meet displacement coordination and force balance. According to the method, the initial stress state of the deep underground structure can be accurately simulated, and the accuracy of obtaining the mechanical response rule of the underground structure is improved.

The application discloses a control method and device of a grass collecting device and electronic equipment. The control method of the grass collecting device comprises the following steps: obtaining a grass unloading instruction; controlling the grass collecting box to move from a first position to a second position in a first direction according to the grass unloading instruction, wherein the first position is a position where the grass collecting box is in a closed state, and the second position is a position where the grass collecting box reaches a maximum opening angle; and controlling the grass collecting box to swing according to swing parameters, wherein the swing parameters comprise a swing angle, and the swing angle is smaller than the maximum opening angle. By using the control method of the grass collecting device, most of the grass clippings can be unloaded after the grass collecting box is lifted, and different direction inertial forces can be generated in the swinging process of the grass collecting box, so that a small amount of residual grass clippings can be removed through vibration, the situation that the grass is not completely unloaded is avoided, the grass unloading efficiency and effect are improved, and manual unloading operation is saved.

The present disclosure obtains a vehicle occupant restraint device capable of continuously restraining the shoulder of an occupant with a shoulder seatbelt as a reaction force member by supporting an airbag with a seatbelt regardless of the physique difference of the occupant during a frontal collision of a vehicle. The vehicle occupant restraint device includes: a seatbelt that restrains an occupant seated on a vehicle seat to the vehicle seat; and a seat belt support airbag which is inflated and deployed at least between a shoulder belt of the seat belt and a shoulder of the occupant by being supplied with gas from an inflator during a frontal collision of the vehicle, the shoulder belt moves toward the front side of the vehicle by following an occupant moving toward the front side of the vehicle due to inertia force, moves along the shoulder belt, and is maintained in a state of being interposed between at least the shoulder of the occupant and the shoulder belt.

The invention relates to the technical field of hydraulic system control, and discloses a fault diagnosis method and device for a hydraulic system of fully-mechanized mining withdrawing triangular area supporting equipment. The method comprises the following steps: acquiring real-time operation data of each oil cylinder through a hydraulic system sensor, extracting differences of motion states of the oil cylinders by adopting a time sequence analysis and principal component analysis method, and calculating quantitative indexes of inertia force distribution and non-uniform force distribution of the oil cylinders. And when the quantitative index exceeds a preset threshold value, identifying the abnormal oil cylinder by adopting a clustering analysis method, analyzing the correlation between the positioning deviation and the abrasion of the sealing element through a linear regression model, and calculating the occurrence probability of an early fault signal. The fault prediction grading result is generated based on the probability distribution, the oil cylinder control parameters are adjusted through the decision tree algorithm, the oil cylinder operation parameters are updated, dynamic adjustment of the hydraulic system and optimization of the supporting structure are achieved, the fault diagnosis precision of the hydraulic system is improved, and the stability and reliability of the supporting structure are ensured through real-time compensation control.

The invention discloses an intelligent layering and guiding device for highway tunnel fire smoke and a control method, and relates to the technical field of tunnel fire safety, a smoke flow Froude number is introduced as a direct control target, the parameter represents the ratio of smoke flow inertia force to buoyancy force, the numerical value directly determines the stability of a layering interface, and the layering interface can be directly controlled. The Froude number of each subarea of the tunnel is calculated in real time through a sensing network and is compared with a critical value calibrated through an experiment, when a real-time value is lower than the critical value, it is indicated that inertia force is relatively insufficient, the buoyancy effect is dominant, and instability and entrainment are likely to happen to an interface between a smoke layer and lower cold air, and then according to a control algorithm, the smoke layer and the lower cold air are controlled. The micro jet fan applies directional inertia force to a smoke layer by adjusting the angle and the speed, the intelligent induction smoke outlet optimizes local pressure difference and flow by adjusting the opening degree and assists in maintaining flowing, the smoke flowing state is actively locked in a stable layered flow interval, and mixing and sedimentation caused by flow state instability are prevented.

The invention relates to the technical field of gear shaft machining equipment, and discloses new energy direct drive motor gear shaft machining equipment and a machining technology.The new energy direct drive motor gear shaft machining equipment comprises a quenching pool and a lifting frame, the lifting frame is located above the quenching pool, and the quenching pool is filled with quenching oil; the bearing frame and the gear shaft body are driven by the driving assembly to rotate in the quenching oil in a reciprocating mode, the tearing effect of inertia force on a covering film on the surface of the gear shaft body is further enhanced through the rotation, more importantly, in the rotating process, the contact state of the surface of the gear shaft body and the quenching oil can be continuously changed, and the gear shaft body is prevented from being damaged. The gear shaft body is alternately exposed in the high-temperature oil area and the low-temperature oil area, and the alternate exposure mode can always ensure that the workpiece gear shaft body can be in contact with low-temperature quenching oil, so that the problem that the temperature of the quenching oil rises due to long-time contact with a high-temperature workpiece is effectively avoided, and a good quenching effect is ensured.

The invention discloses a five-axis machining cutter location linear interpolation optimization control method, which relates to the technical field of numerical control machining, and comprises the following steps: fitting a machining contour to generate a curve expression, determining an operation point sequence based on curvature distribution, and converting the operation point sequence into an actuator pose sequence; based on the model of a five-axis machining machine tool, a total transformation matrix from a base coordinate system to an actuator coordinate system is established through a D-H method, motion parameter changes caused by five-axis elastic deformation and inertia force are established based on the nonlinear beam theory and the Alembert principle, and a nonlinear axis body coupling motion equation is established; a correction expression is generated in combination with the Jacobian matrix, optimal unknown parameters in the correction expression are determined by introducing a quantum fluctuation simulated annealing algorithm, and a correction Jacobian matrix is generated; according to the actuator pose change of the adjacent operation points in the actuator pose sequence, the corrected Jacobian matrix is combined, the inverse kinematics algorithm is adopted to derive the motion parameter vector of the previous operation point, and higher-precision machining control is achieved.

The invention provides an electric power steering active return control method and system, and belongs to the field of electric power steering systems.The electric power steering active return control method comprises the steps that in the rotating process of a vehicle steering wheel, zone control is conducted with the steering wheel rotating angle as the benchmark, and original request torque is obtained; estimating the inertia moment of the steering wheel in the steering wheel aligning process; and calculating the original request torque and the steering wheel inertia torque to obtain a corrected steering wheel torque, and correcting the steering wheel torque according to the corrected steering wheel torque. According to the technical scheme, the aligning torque error caused by rotating speed fluctuation of the steering wheel is eliminated, and particularly under the working condition that a driver is completely released from the hand, the stability of aligning control is remarkably improved.

The invention discloses a vibration excitation device, a vibration excitation system and a use method of the vibration excitation device, and relates to the field of engineering structure detection, and the vibration excitation device comprises a supporting frame which is used for being placed on a vibration-excited object; the supporting hinge is arranged on the supporting frame; one side of the lever is rotationally connected with the supporting hinge; the mass block is connected with the other side of the lever and is arranged on the support frame; the actuator is arranged on the supporting frame, and the output end of the actuator is connected with the lever; and the elastic piece is arranged on one side, hinged with the support, of the lever and is connected with the support frame and the lever. According to the vibration excitation device, the elastic force provided by the elastic piece fixedly installed on the supporting hinge side during resonance counteracts the inertia force, the actuator only needs to overcome the damping force, the reverse elastic force provided by the elastic piece can reduce friction damping, and the actuator power of the vibration excitation device is further reduced.

The invention discloses a combined sucker rod centralizer, and relates to the technical field of sucker rod centralizers, the combined sucker rod centralizer comprises an upper fixing sleeve and a centralizing assembly, the upper fixing sleeve is connected to the outer side of a sucker rod body in a penetrating and sleeving manner, the lower side of the upper fixing sleeve is connected with an upper adjusting mechanism capable of moving up and down, and the upper adjusting mechanism is connected with the upper side of the centralizing assembly. According to the combined sucker rod centralizer, the rotation effect of the centralizing assembly is automatically achieved through the inertia force of up-down movement of a sucker rod and rolling fit of the slope blocks and the balls, so that the contact points of the steel balls and the inner wall of an oil pipe are continuously and dynamically changed, and the situation that local concentrated abrasion is caused due to the fact that the contact points of a traditional centralizer are fixed is avoided; and through high-low position automatic matching of the first inclined plane block and the second inclined plane block, bidirectional stable supporting of the upper guide rod, the lower guide rod and the centralizing assembly can be achieved, the situation that the centralizing assembly is unstable due to inertia offset is avoided, and the operation stability of the device is guaranteed.

The invention discloses a tuned mass vibration damper with controllable damping, and relates to the field of vibration control of offshore wind power generation equipment structures. The mass damping unit is arranged in a suspended mode, the clamping ring is coaxially arranged, the electromagnetic damping units are evenly distributed in the circumferential direction of the clamping ring, and the electromagnetic damping units are connected with the mass damping unit through winding ropes which are arranged in a radial mode to form a multidirectional synergistic composite damping system; the mass damping unit generates reverse inertia force in vibration to restrain movement of the tower and drives the electromagnetic damping unit to act at the same time, the generator is driven to generate electromagnetic damping through the one-way bearing and the speed increaser, and lossless reset is achieved through the torsion ring. The device is integrated with an energy recovery unit, vibration energy is converted into electric energy to be stored, real-time regulation and control of damping force, omni-directional vibration response and energy feedback are achieved, and the vibration reduction efficiency and the energy utilization rate are remarkably improved.

A cone or cylindrical tube stack with narrow in-between gap circumferential surface swirling cyclone separator according to the present invention, creating swirling flow by flowing along the convex outer surface of the inner-stacked cone or cylindrical tube. The inner wall of the outer-stacked cone or cylindrical tube, which is a concave surface, serves as the wall for collecting fluid with larger or higher density particles that is opposite to the surface for swirling, which is disposed in accordance with the separation movement of larger or higher density particles that centrifuged from swirling by their inertial force. The distance that the particles travel towards the wall for collecting fluid with larger or higher density particles is short due to the narrow swirling and separating gaps, combined with the flow on the convex curved surface of the cone or cylindrical tube walls which pressure drag is low, this results in higher swirling speeds than those on the concave inner surface of conventional cyclone, significantly increasing the inertial force of particles centrifuged away from the swirling. Consequently, the separation efficiency of the cone or tube stack circumferential surface swirling cyclone separator according to the present invention is much higher than that of conventional cyclone separators. Especially in cases where the cyclone fluid separator according to the present invention is equipped with multi-stage separation, where the final stage utilizes multiple small cyclones, and in configurations where multiple cones are stacked and equipped with device for swirling and counter-flow separation, which convex fluid drainage ridges are installed on the wall for collecting fluid with larger or higher density particles, the ridges curving towards the side that the swirling flow flows to, sloping from the downstream edges of the cones or cylindrical tubes towards the upstream edges of the cones or cylindrical tubes, which counter to the swirling flow along the convex curved surface of the outer circumferential surface of cone or cylindrical tube. When working with a reverse swirling system, enabling to recycle multiple separation within the system before the fluid exits the separator, enabling high separation efficiency for separating various types of fluids mixed into emulsion or separating micron-level dust such as PM 2.5 from the air.

The utility model discloses a rolling device which comprises an installation frame, an upper roller and a lower roller, a crack for a pole piece to pass through is arranged between the upper roller and the lower roller, two ends of the upper roller are respectively connected with a first bearing seat, the two first bearing seats are installed on the installation frame in a sliding mode, two ends of the lower roller are respectively connected with a second bearing seat, and the second bearing seats are installed on the installation frame in a sliding mode. The two second bearing seats are installed on an installation frame, the upper roller and the lower roller are in transmission through a gear transmission mechanism, an ultrasonic transducer is arranged on the installation frame, the output end of the ultrasonic transducer is connected with the first bearing seat, and the ultrasonic transducer is used for driving the first bearing seat to vibrate up and down. According to the rolling device disclosed by the utility model, under the action of inertia force generated by high-frequency vibration of the upper roller, the pole piece is rolled and generates plastic deformation, particles in a coating displace, and pores are reduced, so that the surface density of the pole piece is increased.

The invention relates to the technical field of reverse osmosis filtration, and discloses a reverse osmosis membrane filter element assembly and a use method thereof.The reverse osmosis membrane filter element assembly comprises two annular plates, a hollow cylinder is rotationally connected between the two annular plates, a motor is fixedly connected to the top of the upper annular plate, and the motor drives a large gear to rotate through a small gear on a first rotating shaft; the large gear drives the hollow cylinder to rotate, the hollow cylinder drives the first filter screen and the fixing plate to rotate when rotating, and the second filter screen slides in the sliding groove to extrude the spring to generate elastic force, so that the first filter screen and the second filter screen are staggered, the size of a filter screen opening is reduced, large particles in water are blocked in the first filter screen, and the filtering effect is achieved; when the hollow cylinder stops rotating, the filter screen II resets under the action of the elastic force of the spring, so that the filter screen openings are aligned, particles in the filter openings are thrown out under the action of inertia force, and filtered water flows into the next process through the water outlet, so that impurities are prevented from flowing out from the filter openings, and the filtering effect is improved.

The invention relates to the technical field of crane safety monitoring, and discloses a crane hoisting overload state monitoring method and system based on digital twinning, and the system comprises a twinning modeling module, a data acquisition module, a state simulation module, an overload decision module, and a model optimization and visualization module. Deep interaction between a physical world and a virtual space is realized through digital twin bodies, limitation of a traditional monitoring method is broken through, multi-source parameters such as wind speed, load and structural stress are fused for the first time, a dynamic coupling model is constructed, nonlinear correlation of wind load, inertia force and structural deformation is captured, the problem of missed judgment of hidden risks in the traditional method is solved, and the method has a wide application prospect. An accident early warning coverage range is expanded, a deflection calculation model is established based on an improved mechanical theory, high-sensitivity detection of fine deformation of the main beam is realized, compared with a static model, the magnitude order is improved, structural damage accumulation is effectively prevented, deep correlation mining is performed on historical and real-time data, and long-time-history advanced early warning of overload risks is realized.

The utility model discloses an inner cooling oil chamber, oil cooling piston and engine, including: inner cooling oil chamber body, including oil chamber body lower part and oil chamber body upper part, oil chamber body upper part at least includes first vortex area and second vortex area, first vortex area is closer to piston center than second vortex area, and the first vortex area is closer to piston center than second vortex area. The second vortex region is closer to the piston ring groove than the first vortex region. Engine oil is sprayed into the oil inlet channel through an engine oil pump and enters the inner cooling oil cavity body through the oil inlet channel. Along with rapid and high-frequency up-and-down movement of the piston, engine oil continuously collides with the upper wall face and the lower wall face of the inner cooling oil cavity body under the action of inertia force, part of the engine oil impacts the first vortex area to form a first vortex, and part of the engine oil impacts the second vortex area to form a second vortex. The contact area of engine oil and the inner cooling oil cavity body is increased, the flowing speed of the engine oil in the vortex area is higher, a better cooling effect is generated, the temperature of a piston can be more effectively reduced, and the phenomenon that the engine oil in the inner cooling oil cavity is coked is reduced.

The present invention is a minimum size, maneuverable, comfortable, safe, and inexpensive compact vehicle, having a higher level of cornering / turning stability than the current state of the art. The inventive design may be applied to two-, three-, and four- (or more) wheeled vehicles. The invention may be utilized in the design of the main components of vehicles providing an increased stability during turning, even at high speeds, based on fixed and moveable chassis portions which swing in relation to one another and novel linking mechanisms connected with large and / or wide wheel portions.

The invention belongs to the technical field of vibration control, and discloses a tuned mass damping device for controlling low-frequency vertical bending vortex vibration of a large-span bridge, which consists of a fixed pulley, a mass block, a high-strength light force transmission cable, a spring, a hanging ring and a damper. Fixed pulleys and mass blocks are arranged at the positive and negative maximum displacement positions of a longitudinal bridge direction mode of a main beam respectively, a suspension system is formed by a full-length force transmission cable, and the gravity of the two mass blocks is basically balanced; the mass block is connected through the spring and is close to the bridge vibration control target frequency. When the bridge vibrates, the two mass blocks generate inertia forces which are opposite in direction but overlapped with each other, the driving system and the bridge form resonance, and therefore bridge vibration is effectively restrained. The gravity of the mass block can be self-balanced, the strength and the number of the springs are greatly reduced compared with those of a traditional TMD, any low-frequency tuning can be conducted in a vertical limited space, and the engineering cost is remarkably reduced. The device can be used for controlling vertical bending and torsional vibration of various engineering structures; the damper is replaced by an actuator, so that active control can be realized or the damper can be used as a structural excitation device.

The invention provides a vehicle transportation control method and device based on a throwing box and electronic equipment, and relates to the technical field of throwing box control, a box body of the throwing box is connected with a vehicle through a 360-degree track, and the box body is correspondingly provided with a box body displacement control device; the method comprises the following steps: in response to a direction control operation for a driving direction control operation device, transmitting a direction control instruction corresponding to the direction control operation to a box body displacement control device; based on the direction control instruction, the specified vehicle body weight corresponding to the vehicle and a front road condition image of the vehicle acquired by an image acquisition device, analyzing and predicting the to-be-driven angle of the vehicle and the to-be-moved intensity of the vehicle through an AI system; and according to the to-be-driven angle and the to-be-driven moving intensity, the box body is controlled to move and / or rotate on the track through a box body displacement control device, so that the inertia force caused by the to-be-driven moving intensity and the to-be-driven angle to the box body is counteracted in advance through second displacement of the box body relative to the vehicle.

The invention relates to the technical field of dynamic force measurement, and particularly provides an inertia force compensation method and system for a dynamic force measurement platform, and the method comprises the steps: arranging a plurality of acceleration sensors on the measurement platform, so as to collect the acceleration information of the platform in the dynamic motion in real time; by combining the mass of the dynamic force measurement platform and the inertia moment data of the dynamic force measurement platform, the error of the platform caused by inertia is calculated and compensated, so that the precision of dynamic force measurement is improved. The method provided by the invention is particularly suitable for small-amplitude disturbance force and micro-vibration measurement scenes, and the interference of the inertia force of the platform on the measurement result can be remarkably reduced.

The invention belongs to the technical field of digital design of Roots blower equipment, and particularly relates to a digital twinning-based dynamic performance digital design method of a blower, which comprises the following steps of: constructing a multi-component parameterized structure model of the blower, establishing a multi-physics field coupling model of pneumatic, structural, thermal, electromagnetic and sound fields, and constructing a digital twinning model of the blower. Dynamic boundary conditions such as flow disturbance, inertia force and base disturbance are loaded, a digital twin model synchronous with a physical fan state is constructed, master-slave type strong coupling joint solution is executed, multi-field response indexes are extracted and normalized analysis is carried out, and finally optimization design parameters of the fan are output through a multi-target optimization feedback mechanism. According to the method, multi-domain balance design among fan structure performance, electromagnetic response, thermal stability and acoustic characteristics can be achieved, modeling precision and parameter optimization capacity are improved, and the method is suitable for digital development of high-reliability roots blower equipment under complex operation conditions.

The utility model discloses a generator shaft vibration force testing device, which comprises a bearing bottom plate and a to-be-tested assembly arranged on the top surface of the bearing bottom plate, two testing supports arranged side by side are arranged at the top of the bearing bottom plate, and a testing shaft in transmission connection with the to-be-tested assembly is inserted between the two testing supports. The test shaft is sleeved with a counterweight assembly used for gradually increasing counterweight to optimize test conditions, the counterweight assembly comprises a bearing disc detachably arranged on the outer surface of the test shaft in a sleeving mode, a plurality of circular grooves with the inclination not smaller than 10 degrees are formed in the bearing disc, the inner wall of each circular groove is connected with a rubber ring, and the inner diameter of the rear end of each rubber ring is smaller than the inner diameter of the middle of each rubber ring. And a counter weight is inserted into the rubber ring. According to the utility model, by adjusting the number and the weight of the counterweights, different grades of loads and inertia forces borne by the generator during working are simulated, so that different vibration test requirements are met, the vibration condition of the generator during operation is reflected more truly, and the test reliability is improved.

The invention belongs to the technical field of truss girder hoisting, and particularly relates to intelligent hoisting equipment for a suspension bridge truss girder in an extreme wind environment and a hoisting construction method.The intelligent hoisting equipment comprises a floating crane, and a hoisting tool component is fixedly installed at the lower end of a steel wire rope of the floating crane and comprises a posture adjusting device and an offset adjusting device. According to the intelligent hoisting equipment for the suspension bridge truss girder in the extreme wind environment and the hoisting construction method, by arranging the sling component and integrating the posture adjusting device and the offset adjusting device, multi-degree-of-freedom active adjustment can be conducted on the hoisted truss girder. The offset adjusting device generates reverse inertia force by driving the mass block to move, so that horizontal swinging of the truss girder caused by wind load is effectively counteracted; the posture adjusting device accurately corrects pitching and rolling postures of the truss girder by adjusting the length of the steel wire rope set, and therefore the overall wind resistance stability and posture keeping capacity of the hoisting system are remarkably enhanced in the extreme wind environment.

The embodiment of the invention provides a trigger and a zero-gravity seat, the trigger comprises a shell, a piston and a gas generator, and the piston comprises a mounting part accommodated in the shell and a fixing rod extending out of the shell; the fixing rod can move between a first position for locking the first component and the second component and a second position for unlocking the first component and the second component, and the gas generator is configured to push the piston to enable the fixing rod to move from the first position to the second position or from the second position to the first position after being actuated; the gas generator is fixed at one end of the mounting part, the gas outlet end faces the fixing rod, a circulating hole is formed in the mounting part, and a sealed cavity is formed between the gas outlet end and the shell. In a normal state, the fixing rod is located at the first position, the seat backrest is in a locking state, when a vehicle collides, the gas generator is ignited, the piston is pushed to enable the fixing rod to move to the second position, and the seat backrest rotates to a normal sitting posture along with the upper half body of a human body under the action of inertia force.

The invention relates to the related technical field of four-chip bridge rectifier processing, in particular to double-end synchronous processing precision miniature MBL bridge rectifier production equipment and a production process, and the equipment comprises a chip combining mechanism, and a material placing table, a solder paste printing mechanism and a die bonding mechanism which are symmetrically arranged along the chip combining mechanism and are sequentially arranged towards the direction of the chip combining mechanism; the die bonding mechanism comprises a support frame body; two symmetrical connecting parts are formed on the connecting arm and used for connecting the swing arm, and two die bonding suction nozzles are installed at the end, away from the connecting arm, of the swing arm; the buffering shaft is connected with the connecting arm, and a buffering piece which elastically buffers in the circumferential direction is arranged between the buffering shaft and the telescopic shaft connected with the driving source; the lifting driving unit is arranged on the supporting frame body and is used for driving the buffer shaft to move axially so as to drive the die bonding suction nozzle to move downwards and reset; the buffer shaft can effectively slow down the initial rotation speed under the action of the buffer piece, so that the problem that crystal grains on the die bonding suction nozzle deviate or fall off due to the dual action of inertia force and centrifugal force is solved.

The invention discloses a critical parameter prediction method for a vertical cantilever fluid conveying pipe comprising a water injection pump and a Y-shaped nozzle, and relates to the field of fluid conveying pipe critical parameter calculation. The prediction method is based on an Euler-Bernoulli beam model and a momentum theorem, bending force, centrifugal force, Coriolis force, inertia force, gravity and additional force generated by an elbow are comprehensively considered, and an oscillatory differential equation of the fluid conveying pipe is established. The method comprises the following steps: performing dimensionless processing on an oscillatory differential equation by introducing dimensionless parameters, deducing a characteristic equation, a characteristic function and a characteristic value under a cantilever boundary condition, converting a partial differential equation into an ordinary differential equation set, and performing matrix solution; and finally, accurate prediction values of the critical flow velocity and the critical frequency can be obtained. The method can effectively reflect the influence rule of the nozzle and the concentrated mass on the vibration characteristics of the fluid conveying pipe, and realizes the accurate prediction of the critical parameters of the vertical cantilever containing the concentrated mass belt Y-shaped nozzle fluid conveying pipe.

The invention relates to the technical field of screw locking machines, in particular to a switch socket automatic screw locking machine which comprises a first electric push rod, a first round rod, a first circular ring, a silica gel ring and a tightening assembly. An electric push rod I is fixedly connected to the connecting block I; the telescopic end of the first electric push rod is fixedly connected with a plurality of first round rods which are in sealed sliding connection with the cylinder. A circular ring I is jointly connected among all the circular rods I and is in contact with the cylinder; a silica gel ring is fixedly connected to the lower side of the circular ring and is in contact with the cylinder; in the screw transferring process, the screw can be stably fixed through cylinder negative pressure and cylinder limiting, the phenomenon that the screw falls off due to inertia force and other external force generated by quick starting and stopping of the screw is avoided, in the process that the screw is inserted into a deep hole, through cooperation of the silica gel ring and the screwdriver, the screw is kept vertically and downwards moving to the bottom of the deep hole, and the screw is prevented from falling off. Therefore, the screw can be stably screwed into the deep hole of the socket, and the skewing phenomenon is avoided.