63results about How to "Avoid severe impact" patented technology

This invention relates to reclosing method for power transmission line. For joint parallel double circuit type: each circuit being equiped with individual protector, main protection being phase-splitting current differential protection or phase-command longitudinal protection; for various type single circuit fault or overline fault withni a zone, tripping fault being detected, determinnig no serious permanent fault, sequentially reclosing the tripping phases. For double-circuit fault, there must be two different type circuit being of no fault for reclosing, if not, two circuits must be tripped-off. This invention method increases the reclosing rate, together with minimizing the shock to the system after reclosing permanent fault.

The invention relates to a natural gas electromagnetic valve, which comprises a valve body, wherein the valve body comprises an inlet section and an outlet section; the inlet section and the outlet section are partitioned through a partition board; the periphery of the valve body is provided with at least two valve passages; the valve body corresponding to the valve passages is provided with valve core assemblies for partitioning or conducting the corresponding valve passages; and the valve core assembly comprises an armature, a guide sleeve covered outside the armature, a coil around the guide sleeve and a return spring arranged between the guide sleeve and the armature. The inlet section and the outlet section of the natural gas electromagnetic valve are partitioned through the partition board, the periphery of the valve is provided with the at least two valve passages, and each valve passage is provided with the corresponding valve core assembly to control the opening and closing of the corresponding valve passage so as to gradually open the valve passages, gradually accumulate the flow in a conveying pipeline, avoid flow surge caused by fully communicating the inlet section and the outlet section of the valve body at one time and prevent the flow surge of the conveying pipeline from sharply impacting monitoring equipment.

The invention discloses a sample plate conveying device which comprises obliquely-arranged slides, driven rollers, transmission gears and a chain assembly. The slides incline downwards from the first ends of the slides to the second ends of the slides, and are provided with grooves formed in the length directions of the slides. The driven rollers are arranged at the first ends of the slides. The shaft ends of the driven rollers are provided with driven roller gears. The transmission gears are in engaged connection with the driven roller gears. The chain assembly is arranged under the slides and comprises chains and chain gears. Stop blocks are fixedly arranged on the chains and stretch out of the grooves in the slides. The chain gears arranged close to the first ends of the slides are engaged with the transmission gears. By adoption of the sample plate conveying device, sample plates can be conveyed to a certain position, time and labor are saved, the safety is high, and the reliability is good; the conveying states of the sample plates in the conveying process can be effectively guaranteed; and controllability of the conveying states of the sample plates can be achieved.

The invention discloses an energy storage transient power coordination control method for suppressing subsequent commutation failure, and belongs to the technical field of multi-infeed extra-high voltage alternating current and direct current hybrid power grids. The method comprises the following steps: detecting a direct current, an alternating current bus voltage and an extinction angle of an inverter side; and when the direct current is greater than a first current threshold value or the alternating current bus voltage is smaller than a voltage threshold value or the extinction angle is smaller than a first extinction angle threshold value, controlling an energy storage power station to enter a transient state control mode. According to the invention, an energy storage active output time instruction and a reactive output time instruction are respectively determined by detecting a direct current and an extinction angle of an inverter side, an active power output amplitude instruction is determined by detecting the voltage of an alternating current bus, a reactive power output amplitude instruction is determined by utilizing an energy storage total capacity constraint, and an energy storage active instruction and a reactive instruction of a target output amplitude are sent to an energy storage power station at the target output moment, so that subsequent commutation failure after the alternating-current and direct-current hybrid system breaks down can be effectively suppressed, and voltage recovery after the fault is promoted.

The invention relates to a bundled fine dried noodle flush device and a fine dried noodle packaging line. The bundled fine dried noodle flush device comprises a rack and a noodle-flush conveying mechanism, and the conveying direction of the noodle-flush conveying mechanism is perpendicular to the arranging direction of all bundled fine dried noodles in the same group; the noodle-flush conveying mechanism comprises a flexible transmission part and a pushing part; a fixed bearing surface for bearing the grouped bundled fine dried noodles is configured on the rack, and/or the noodle-flush conveying mechanism further comprises a flexible conveying part, and a conveying part bearing surface for bearing and conveying the grouped bundled fine dried noodles is configured on the flexible conveyingpart; and the noodle-flush conveying mechanism pushes the grouped bundled fine dried noodles to slide on the fixed bearing surface and/or the conveying part bearing surface through the pushing part, so that the end faces of the grouped bundled fine dried noodles are flush, and the grouped bundled fine dried noodles are conveyed. The grouped bundled fine dried noodles slide relative to the fixed bearing surface or the conveying part bearing surface, the end faces of the grouped bundled fine dried noodles are flush under the pushing effect of the pushing part, then the subsequent packaging process is facilitated, and the packaging efficiency of the fine dried noodle packaging line is improved.

The invention discloses a tripping control system of a BPRT unit transmission clutch and a control method of the tripping control system, and relates to the technical field of blast furnace blast gasexcess pressure energy recovery integrated devices. The technical problems that under the condition that blast furnace gas parameters of a BPRT unit abnormally fluctuate greatly, an engagement deviceof the transmission clutch is damaged due to violent impact are solved. The tripping control system comprises a tripping control device, a unit PLC, a stationary blade servo controller, a rotating speed sensor and a stationary blade position sensor. The unit PLC, the stationary blade servo controller and the rotating speed sensor are connected with the tripping control device through electric signals, the unit PLC can set the engagement rotating speed of the transmission clutch, the stationary blade servo controller is used for receiving signals of the tripping control device and the stationary blade position sensor and sending an instruction to a hydraulic device, the stationary blade servo controller controls the stationary blade angle of a turbo-expander through the hydraulic device, and therefore the rotating speed of the turbo-expander is controlled.

The invention relates to the technical field of conveying of power batteries, in particular to a jacking positioning device. The device comprises a mobile cart, a jacking mechanism and a positioning assembly. The jacking mechanism is arranged on a moving track of the mobile cart and located below the bottom face of the mobile cart and comprises a base, a lifting assembly arranged on the base and atop plate movably connected with the base, and the lifting assembly drives the top plate to move up and down. The positioning assembly is fixedly arranged on the top plate. The top face of the top plate is provided with multiple rolling parts so that the bottom face of the mobile cart can slide to the top face of the top plate when passing the rolling parts, and when the bottom face of the mobilecart is moved to the top face of the top plate, the positioning assembly can position the mobile cart to the top face of the top plate. The rolling parts can lower the moving resistance of the mobilecart, the mobile cart is prevented from shifting during movement, and the positioning assembly can prevent the mobile cart from shifting during lifting.

The invention discloses a train wheel and rail turnout device capable of reducing wheel-rail impact influence and relates to integral-cast frog and a guardrail. The frog comprises wing rails, a point rail and frog bottom plates formed between the wing rails and between the wing rails and the point rail. The guardrail is provided with a guardrail bottom plate and is integrally connected with an outer steel rail. The frog bottom plates and the guardrail bottom plate are thinnest at the corresponding positions of a frog toe end and a frog heel end, the thickness of the frog bottom plates and the guardrail bottom plate gradually increases towards the middle, the even thickness h of the frog bottom plates and the guardrail bottom plate is kept in a range not smaller than a harmful space, and h is the difference between the height of the frog or the steel rail and the height of a wheel flange plus 1-2mm. The train wheel and rail turnout device has the advantages that fierce impact of wheels on the frog due to the existence of the harmful space is avoided effectively, steel wheel and frog damage is reduced, steel wheel and frog maintenance is reduced, and the service life of the steel wheels and the frog are prolonged; the fierce impact of the steel wheels on the frog is eliminated, wheel vibration and noise are reduced, riding comfortableness is increased, and train operation energy consumption is reduced.

The invention discloses an anti-impact spring chair comprising a chair frame, a bottom buffer mechanism, a back buffer mechanism and a limiting mechanism, a cushion is mounted at the top of the chairframe, a backrest is mounted on one side of the top of the chair frame, supporting legs are welded to the bottom of the chair frame, the bottom buffering mechanism is arranged under the cushion, the back buffering mechanism is arranged on one side of the backrest, and the limiting mechanism is arranged in the center of one side of the chair frame. Through buffering and counteracting in the three directions, force acting on a chair and a human body is greatly weakened, and the safety of operators is effectively protected.

The invention discloses a safety valve structure capable of avoiding impact of a valve clack during opening and closing and a method thereof. An upper buffer of the safety valve structure is fixed above a valve rod, a first piston is arranged at the bottom, and an inner cavity located above the first piston serves as a first oil cavity; a first oil conveying hole is formed in the side wall; and a lower buffer set comprises at least two lower buffers of the same structure, and all the lower buffers are located in a valve seat and evenly distributed. Second pistons are arranged at the tops of the lower buffers, and an inner cavity below the second pistons serves as a second oil cavity; and a second oil conveying hole is formed at the lower portion of the outer side wall, the first oil cavity, the oil conveying pipe and the second oil cavity jointly form a communicated buffering channel which is closed all the time, and the buffering channel is filled with buffering media. On the basis of ensuring that a safety valve is opened and closed in a short enough time, the impact of the valve clack to a guide sleeve in the opening stage and the impact of the valve clack to the valve seat in the closing stage are reduced, the service life of valve internals of the safety valve is prolonged, and impact damage in the opening and closing process of the safety valve is avoided.

The invention discloses a hydraulic suspension type reactor shutdown rod and a working method thereof. The hydraulic suspension type reactor shutdown rod comprises a control rod guide tube, a reactor core, a cladding, a neutron absorber and a main coolant pump; the control rod guide tube is installed in a reactor core, the cladding is located in the control rod guide tube, a gap is formed between the control rod guide tube and the cladding, the neutron absorber is arranged in the cladding, a discharge hole is formed in the side face of the control rod guide tube, and the buffer device is installed at a bottom inlet of the control rod guide tube. an outlet of the main coolant pump is communicated with a bottom inlet of the control rod guide pipe. According to the shutdown rod and the working method thereof, the use of a mechanical claw can be avoided, meanwhile, the diversity of shutdown is realized, and the safety is higher.

The invention provides a flexible DC power transmission system fault ride-through voltage margin control method and device. The method comprises the following steps: determining a constant DC voltage end outer loop current amplitude limiting value change rate and a constant frequency control end outer loop current amplitude limiting value change rate; determining a constant direct-current voltage end amplitude limiting value and a constant frequency control end amplitude limiting value; according to the method, the output value of a constant direct current voltage end inner loop current controller and the output value of a constant frequency control end inner loop current controller are determined, and the alternating current side fault ride-through of the flexible direct current power transmission system is controlled, so that the fluctuation is greatly reduced, and the fault recovery time is shortened; the flexible DC power transmission system control is dynamically optimized in real time to adapt to the disturbance of the passive AC system, the AC transient process is stabilized, the safe operation of the flexible DC power transmission systems at two ends during the passive AC system transient fault period and in the fault recovery process can be ensured, and the DC control characteristics can be dynamically adjusted according to the fault characteristics. And alternating-current fault ride-through is realized.