80results about How to "Reduce momentary impact" patented technology

The invention relates to a three-phase inverter capable of working without parallel connection by interconnection lines and a control method thereof. The three-phase inverter comprises an inversion power circuit and an inversion control circuit, wherein the inversion control circuit comprises an inversion and parallel connection control DSP unit, an output voltage sampling circuit, a filtering inductive current sampling circuit, a drive control circuit, a connection power busbar voltage sampling circuit, a connection power busbar voltage sampling and conditioning circuit, and a connection power busbar voltage phase acquisition circuit. The inversion and parallel connection control DSP firstly performs synchronization control according to connection power busbar phase signals to keep the coincident frequency and the coincident phase of the inverter and a connection power busbar; and then, the inversion and parallel connection control DSP fine tunes the phase and the amplitude of reference signals respectively according to the output power of the inverter to realize uniform flow control, and performs certain constraint on phase deviation of the inverter and the connection power busbar by using the synchronization control. The three-phase inverter has the advantages of simple circuit structure, easy implementation, and improvement on stability and reliability of systems without parallel connection of the interconnection lines.

The invention discloses a smooth switching control method for a three-phase dual-mode inverter. The method comprises off-grid and grid-connected smooth switching control and off-grid smooth switching control. Smooth control comprises soft start of virtual impedance and monocycle current feedback control. When the inverter is switched to the grid-connected mode from the off-grid mode, output current phase lead control and smooth switching control are conducted, temporary impact of output currents and in-network currents of the inverter are restrained, and then backward flowing of energy of the inverter is greatly reduced, and grid-connected smooth switching is achieved. When the inverter is switched to the off-grid mode from the grid-connected mode, only monocycle current feedback control is conducted, the in-network currents are reduced to zero quickly, DC side voltage fluctuation of the inverter caused by temporary unbalance of the currents is avoided, and off-grid smooth switching is achieved. According to the method, the problems that current impact is large when the micro-grid inverter is connected to the grid and DC side voltage fluctuates when the inverter is off-grid are solved, and smooth switching of the operation modes of the micro-grid is achieved.

The invention discloses a single-leg robot jumping mechanism driven through a connecting rod. The single-leg robot jumping mechanism comprises a machine body, a thigh and a shank which are hinged in sequence. The thigh is provided with a jumping drive device for driving the shank to rotate. The hinged position of the machine body and the thigh is provided with a direction drive device for driving the thigh to rotate. The upper end of the shank is provided with a shank ejector plate hinged to the lower end of the thigh. A drive rod is arranged between the shank ejector rod and the jumping drive device. The drive device and the shank ejector rod are hinged to the two ends of the drive rod respectively, and an elastic energy storing piece is arranged between the thigh and the shank ejector plate. The direction drive device can drive the thigh to rotate to achieve the direction control. The jumping drive device and the direction drive device are close to the machine body, the rotational inertia of the thigh relative to the machine body is reduced, the energy consumption of a first drive motor can be reduced, and the moving stability and agility of robot movement are improved. The stability of a robot is improved through balancing fly wheels. The energy can be stored and buffering can be achieved through the elastic energy storing piece and balancing pieces.

The invention provides a six-traction device space debris net capture system which adopts level-1 launch and mass blocks synchronization launch and concentric circles rope net folding and receiving. The system comprises a launch subsystem which is composed of a launcher, a net hold, a cushioning device and a tether tension control device; a fly net subsystem which is composed of a rope net and mass blocks; the launcher is used for pushing the mass blocks at a predetermined distance from a target at a predetermined angle and to drive the rope net be pulled from the center of the net hold while unfolding to a fully unfolded state to capture the target after reaching the target location; the mass blocks are used for dragging the rope net so that the rope net is pulled out and unfolded and the net opening is tightened up to complete capture of the target; the number of the mass blocks is at least three and six mass blocks are adopted through optimized analysis; the tether tension control device is connected with the fly net subsystem and with the target through the rope net to pull the captured target off the track; the rope net is encapsulated in the net hold in a concentric circles package and is used to form sufficient coverage to completely surround the target.

The invention provides a mechanical ball screw-type inerter device variable in inerter coefficient. The ball screw-type inerter device comprises an upper lifting lug, a lower lifting lug, a flywheel, a flywheel chamber, a variable lead screw, a screw nut and a screw stroke chamber; the flywheel is fixedly arranged at one end of the variable lead screw, and is located in the flywheel chamber; the screw nut is arranged at a part, extending out of the flywheel chamber, of the screw nut, and is fixedly connected with the upper end face of the screw stroke chamber; the other end of the variable lead screw extends into the screw stroke chamber; the upper lifting lug and the lower lifting lug are respectively hinged to the upper end of the flywheel chamber and the lower end of the screw stroke chamber. According to the ball screw-type inerter device provided by the invention, by adopting the variable lead screw, the inerter coefficient is changed by changing the lead of a ball screw; without installing an additional device or utilizing additional energy, and meanwhile, without a complicated and expensive controller, the inerter coefficient of the ball screw-type inerter device can be changed, and the temporary impact on a road surface is retarded, and the inerter device is prevented from being overloaded, so that the performance of a hanger bracket is effectively promoted further.

The invention aims to provide a hydraulic generating set for a deceleration strip. The hydraulic generating set comprises the deceleration strip and a generator, wherein the generator, an oil tank and generation units are arranged below the deceleration strip; each generation unit comprises a positioning circular block; the upper side of each positioning circular block is contacted with the deceleration strip; a dual-action hydraulic cylinder is arranged below each positioning circular block; each dual-action hydraulic cylinder is provided with a piston and a piston rod which are connected with each other; each piston rod is connected with the corresponding positioning circular block; a return spring is arranged between each positioning circular block and the corresponding dual-action hydraulic cylinder; each dual-action hydraulic cylinder is connected with a hydraulic motor and the oil tank through convergence pipelines respectively; the hydraulic motor is connected with the generator; the oil return port of the hydraulic motor is connected with the oil tank. According to the hydraulic generating set, liquid output by a plurality of dual-action hydraulic cylinders is converged to drive the hydraulic motor to work, so that momentary impact on cylinder bodies can be slowed down, pressure is dispersed, the acting time of a vehicle is prolonged in an impact process, and a good protection effect is achieved on the entire device; mechanical energy is converted into hydraulic energy more sufficiently, so that energy loss is reduced.

The invention relates to a distributed driving type electric automobile failure control system based on quadratic optimization, which comprises a man-automobile state observation system, a steering wheel turn angle sensor, an automobile speed sensor, a required longitudinal driving force sensor and a required direct yawing torque sensor. The distributed driving type electric automobile failure control system is characterized by further comprising an integral driving force failure distribution controller based on quadratic optimization and four driving motor failure state sensors. A driver monitors the driving state of an automobile via the man-automobile state observation system in real time, and simultaneously monitors the driving motor failure state sensors, when failure of driving motors is detected via failure factor values, an integral automobile controller transmits acquired signals to the integral driving force failure distribution controller, dynamic property and stability requirements of the driver are formulated by the aid of the integral driving force failure distribution controller according to steering wheel turn angle signals and automobile speed signals, and an optimal value of driving force is obtained by means of combining other values, and is transmitted to various driving motors. The distributed driving type electric automobile failure control system can be widely applied to failure coordination control of distributed driving type electric automobiles.

The invention discloses an anti-vibration pressure sensor resistant to transient oil pressure impact. The pressure sensor includes a base, a housing, a core, a lower ring, an upper ring, a lower circuit board, an upper circuit board, an insulation ring, a plurality of solder pins and a buffer member disposed between the base and the core. The lower ring, the upper ring and the lower circuit board are disposed in the housing. The bottom end of the lower ring is fixed onto the base, and the top end of the lower ring is connected fixedly with the bottom of the upper ring. The lower circuit board and the upper circuit board are both fixed in the upper ring and are separated from each other through the insulation ring. The lower circuit board and the upper circuit board are mounted and fixed through the plurality of solder pins and are electrically connected. The bottom ends of the solder pins are connected electrically with the core through wires. The invention has the advantages of increasing the circuit board layout area, avoiding the long screw connection and improving the anti-vibration capability.

The invention discloses a penicillin waste water biological enhancement treatment device and method, and belongs to the technical field of waste water treatment and environmental protection. According to the device, the characteristics of multiple sewage treatment devices such as a sequencing batch type reactor, a membrane bioreactor and a moving bed bio-membrane reactor are integrated; the device mainly comprises a hydrolytic acidification area, a moving bed bio-membrane area provided with suspended filler, and a deep treatment area provided with a membrane assembly and suspended filler. The hydrolytic acidification area is used for pretreating waste water, improving biodegradability of the penicillin waste water and degrading a part of pollutants, and the deep treatment area is a main penicillin waste water biological treatment system. According to the penicillin waste water biological enhancement treatment device and method, the treatment efficiency of the penicillin waste water can be effectively improved, the occupied area can be reduced, the effluent quality can be kept stable, the service life of an aerating device and the membrane assembly can be prolonged, maintenance and operating cost can be reduced, and the penicillin waste water biological enhancement treatment device and method are especially suitable for treating the antibiotic waste water with large water quality and amount changes.

The invention provides an arm frame type trawler and belongs to the technical field of ships. The arm frame type trawler comprises a hull structure and two trawling arm frames. The lower ends of the two trawling arm frames are hinged to the two sides of the hull structure. Floating mechanisms are arranged at the tops of the trawling arm frames. Each floating mechanism comprises a floating box. A hydraulic lifting platform is arranged on the lower side face of each floating box. A lifting board is arranged at the lower end of each hydraulic lifting platform. First through holes are formed in the periphery of each lifting board. Sliding rods are inserted in the first through holes. Baffles are arranged at the upper ends of the sliding rods. The size of each baffle is larger than that of eachfirst through hole. The lower ends of the sliding rods penetrate through the first through holes and are hinged to floating bodies. The sliding rods are provided with reset springs. The reset springsare located between the baffles and the lifting boards. An air bag is arranged between each floating body and the corresponding lifting board. An electric air pump is arranged on the upper side faceof each floating box. An exhaust pipe of each electric air pump communicates with the corresponding air bag. The floating mechanisms in the arm frame type trawler achieve a good supporting effect in the trawler trawling operation process, and the ship navigation stability is improved.

Provided is an uphill and downhill winch upper gradient change point grading gradient change promoting design method. When the downhill gradient alpha is larger than 8 degrees and smaller than or equal to 15 degrees, secondary gradient change is carried out, construction is carried out by 6 degrees downhill, a slope is 6-8 m longer than a flat car and then construction is carried out by 15 degrees downhill. When the downhill gradient alpha is larger than 15 degrees and small than or equal to 25 degrees, third-time gradient change is carried out, construction is carried out by 6 degrees downhill, and the slope is 6-8 m longer than the flat car. The construction gradient is increased by 9 degrees, the downhill gradient reaches 15 degrees, and the slope is 6-8 m longer than the flat car. Finally, the construction gradient is increased by 10 degrees, and the designed gradient changes are achieved. By means of the scheme, due to multi-stage gradient change, instant impact caused to a steel wire rope when a small tramcar is at the gradient change point is reduced, damage to the steel wire rope is reduced, the accidents, likely to happen at the upper gradient change point, that the wire is broken and the tramcar runs are solved, and safety production of a mine is guaranteed.

The invention relates to an artificial wetland treatment method and device of pickled food processing wastewater. The artificial wetland treatment method comprises the following steps: (1) inlet water back-flowing and buffering; (2) purifying treatment; (3) sewage treatment, namely infiltrated sewage is collected on a water collection layer positioned on the bottommost part of a treatment pond and enters an effluent water buffer pond through water through holes; (4) back-flowing and salt squeezing. The device constructed according to the artificial wetland treatment method comprises an artificial wetland body, wherein one side of the artificial wetland body is provided with an inlet water buffer pond, and the other side of the artificial wetland body is provided with the effluent water buffer pond; the artificial wetland body positioned between the inlet water buffer pond and the effluent water buffer pond is provided with the treatment pond; the treatment pond is sequentially divided into the water collection layer, a treatment layer, a water distribution pipe, a salt squeezing pipe and salt resistant plants from bottom to top; the treatment layer is filled with multilayer artificial wetland media; the water distribution pipe and the salt squeezing pipe are distributed on the surface of the treatment layer; the salt resistant plants are planted in the artificial wetland media. The artificial wetland treatment method disclosed by the invention has the advantages of wide medium source and low price. The device disclosed by the invention solves the shock problem of fluctuated impact of the water quality and water amount of distributed sewage without continuous and uniform water inflow.

A lasso-driven hip joint series elastic power-assisted exoskeleton robot comprises a waist connecting mechanism and leg connecting mechanisms. The leg connecting mechanisms are arranged on the two sides of the waist connecting mechanism, motor series elastic modules are arranged on the two sides of the waist connecting mechanism correspondingly, hip joint series elastic modules are arranged at thetops of the leg connecting mechanisms, the hip joint series elastic modules and the motor series elastic modules are in connection transmission through lasso transmission mechanisms, and the hip joint series elastic modules, the motor series elastic modules and the lasso transmission mechanisms provide control and power through a driving and sensing system. According to the lasso-driven hip jointseries elastic power-assisted exoskeleton robot, walking assistance can be provided for people with weak walking ability such as old people or sick rehabilitation people, walking assistance can alsobe provided for people needing long-time and long-distance walking in daily life, human-computer interaction and intention perception technologies are combined, human body movement assistance is further achieved, and the human body movement ability is improved.

The invention discloses a connecting device for towing a trailer and belongs to the technical field of trailers. The connecting device comprises an outer sleeve with one end closed and the other end opened, and a connecting shaft, wherein a plugging cover is arranged in an open end of an outer pipe body and forms an enclosed chamber together with the outer sleeve; the connecting shaft is coaxial with the outer sleeve; one end of the connecting shaft is inserted into the outer pipe body from the closed end of the outer sleeve and from the outside in; the outer wall of the connecting shaft is connected with the closed end of the outer sleeve in an enclosed manner; a cylindrical piston block is arranged in the outer sleeve; the outer wall of the piston block is connected with the inner wall of the outer sleeve in an enclosed manner and fixedly connected with the end, inserted in the outer sleeve, of the connecting shaft; a plurality of liquid- permeable holes are formed in the piston block and run through the piston block in the axial direction of the outer sleeve; and the outer sleeve is filled with hydraulic oil. According to the connecting device, the flowing of the hydraulic oil can buffer the instantaneous towing force, caused when a vehicle body is started to move forward, so as to reduce the instantaneous impact on a universal joint to play a certain role in protecting theuniversal joint and thus to reduce the damage, caused by the instantaneous impact, to the universal joint.

The invention discloses a rubber deceleration strip. The rubber deceleration strip comprises a rubber block, a bolt and a casting iron sheet; the rubber block is arranged on the casting iron sheet; the two ends of the rubber block are wrapped with the casting iron sheet; bolt holes corresponding to each other are formed in the rubber block and the casting iron sheet; the bolt is connected with therubber block and the casting iron sheet through the bolt holes; and the rubber block and the casting iron sheet are fixed on the ground through the bolt. Through the design of the technical scheme, the rubber deceleration strip is unlikely to be damaged when in use, the rubber block and the casting iron sheet are unlikely to fall mutually and can be firmly fixed on the ground, and the service life of the rubber deceleration strip is prolonged; and a skid-resistant layer is arranged on the lower surface of the casting iron sheet, and friction force between the casting iron sheet and the groundcan be increased, so that the rubber deceleration strip is unlikely to loose when in use.

The invention discloses a method for reducing parachute opening impact of a ram air parachute. A front edge notch of a lateral side air chamber and front edge notches of constraint air chambers are each evenly provided with a plurality of rope penetrating holes. The constraint air chambers and the lateral side air chamber on the same side are overlapped, and then a constraint rope is used. One endof the constraint rope is fixedly connected with the outer side of the lateral side air chamber, and the other end of the constraint rope penetrates through the rope penetrating holes in the lateralside air chamber and all the constraint air chambers on the same side in the S-shaped penetrating sequence and finally penetrates out of the outer side of the lateral side air chamber to be fixedly connected with the lateral side air chamber. The middle section of the constraint rope further penetrates through a cutting hole of a separator. The separator is fixedly connected with the outer side ofthe lateral side air chamber. When the ram air parachute is opened and a reserved air chamber is unfolded, a timer on the separator is started, when the set time is counted, the separator works, theconstraint rope is cut off in the middle, the air flow in the reserved air chamber flows to the constraint air chambers and the lateral side air chamber, and the ram air parachute is unfolded step bystep until being fully inflated and starting to work. By means of the method, the one-time large transient impact overload is changed into the multi-time small impact overload, and implementation is simple.

The invention concerns a velocity control method for electric drives, in particular for machine tool control systems, wherein impact on the gear unit and machine caused by acceleration is restricted. To this end, control data are read in blocks, and predetermined nominal speeds (Vsoll) are approached as upper speed limits which are to be retained as far as possible, and local speed limits are approached in the form of target speeds (Vziel) at specific target points (Z4), looking ahead (Z'1, Z'3) within the framework of the look-ahead system with slight acceleration changes within the framework of the maximum permissible jolt. An acceleration limit which is independent of the speed can therefore be left at a constant high maximum value.

The invention discloses a split shield tunneling machine hydraulic pushing control valve set convenient to assemble and a control method thereof. The control valve set comprises a valve block base; atotal oil inlet way and a total oil discharge way are arranged on the valve block base; the total oil inlet way comprises a first oil inlet way and a second oil inlet way; a head connection control block is connected between the first oil inlet way and the second oil inlet way; and a control connection control block is arranged on the second oil inlet way. The head connection control block comprises a proportional pressure reducing valve connected between the first oil inlet way and the second oil inlet way; and the proportional pressure reducing valve can adjust the oil supply pressure to realize stepless pressure adjustment. The control connection control block comprises a control connection cartridge valve connected with the second oil inlet way and a control connection three-way electromagnetic reversing valve; the control connection three-way electromagnetic reversing valve can control connection or disconnection of the control connection cartridge valve; and the number of the control connection control block can be selected according to actual demands. The control valve set can reduce the length and save the mounting space, and is convenient to maintain faults and high in interchangeability.

The invention relates to a cutter shaft of a crusher. The cutter shaft comprises a main shaft, wherein a front end face baffle plate and a rear end face baffle plate are arranged on the main shaft and are correspondingly arranged at two ends of the main shaft. A first front tool rest, a first rear tool rest, a second front tool rest and a second rear tool rest are sequentially arranged between the front end face baffle plate and the rear end face baffle plate on the main shaft. The first rear knife rest and the second front knife rest are arranged in the middle of the main shaft in an overlapped mode, and the first front knife rest and the second front knife rest are sequentially provided with a special-shaped knife A, a special-shaped knife B, a special-shaped knife A and a special-shaped knife B in the circumferential direction. According to the scheme, through the arrangement method of axial overlapping and tangential dislocation of the knife rest set, namely the arrangement mode of the first front knife rest, the first rear knife rest, the second front knife rest and the second rear knife rest, the special-shaped knife A and the special-shaped knife B which are arranged on the first front knife rest and the second front knife rest are partially crossed and overlapped with the special-shaped knife A and the special-shaped knife B which are arranged on the first rear knife rest and the second rear knife rest, so that axial clearances between cutters in the same group can be avoided, and the cutting efficiency is improved. The cutting effect is good, the instant impact in the cutting process is lower, the vibration is smaller, the service life of equipment can be effectively prolonged, the noise is lower, and the noise pollution of the equipment is reduced.