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

Re-switch on method for electric tansmission device

ActiveCN1588729ASolve the problem of correct phase selection and quick tripAdvancedEmergency protective arrangements for automatic disconnectionPhase splittingUltra high voltage
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.
Owner:NR ELECTRIC CO LTD

Automatic return door hinge and refrigerator using same

The invention provides an automatic return door hinge, wherein through the mutual matching of a damping part and a return automatic hinge, when the refrigerator is being closed, the two wedges of a first mounting plate and a second mounting plate are mutually matched to form automatic return, a hollow guide pipe drives a first sleeve to rotate relative to a second sleeve, so as to enable the damping grease between the first and the second sleeves to generate extrusion, as the viscous action of the damping grease blocks the relative motion between the first and the second sleeves to supply the damping buffer action, so that the serious collision between the refrigerator door and the refrigerator body caused by overhigh speed of the automatic closing of the refrigerator door is effectively avoided, and the service life and the using comfort of the refrigerator are effectively improved.
Owner:BYD CO LTD

Alarm processing method and background management device

The provided alarm process method comprises: A. receiving alarm message from RNC; B. deciding whether the message fit to pre-set conditions; and C. controlling the alarm message flow according to decision result. This invention avoids serious impact on BAM, and controls the damage in an acceptable range.
Owner:XFUSION DIGITAL TECH CO LTD

Lower sliding door installing structure and cooking utensils

Then invention relates to the field of home appliances, and discloses a lower sliding door installing structure and cooking utensils, wherein the sliding door installing structure comprises a front plate (10), a lower sliding door (20), a first damping hinge (30) and a second damping hinge (40). The lower sliding door is connected to the front plate through the first damping hinge and the second damping hinge in a pivotal mode. The first damping hinge comprises a first damper (31), the second damping hinge comprises a second damper (41), the first damper and the second damper are arranged in a mode that when the lower sliding door is in the open position, the first damper is in a working state, and the second damper is in a working stop state; and when the lower sliding door is in the close position, the first damper is in a working stop state, and the second damper is in a working state. When the lower sliding door reaches the position close to the open position and the closed position, buffer is provided by the first damper and the second damper, so that severe impact and noise generated by moving the lower sliding door to the extreme position are avoided.
Owner:GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD +1

Natural gas electromagnetic valve

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.
Owner:HENAN AEROSPACE HYDRAULIC & PNEUMATIC TECH

Sample plate conveying device

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.
Owner:BAOSHAN IRON & STEEL CO LTD

Bidirectional hydraulic lock

The invention relates to a bidirectional hydraulic lock. An annular extension part which can extend from the position of a valve hole to a plunger and prop against a corresponding side of the prop tolimit the movement of the plunger is formed on the peripheral wall of the valve hole of a valve sleeve of a one-way valve of the bidirectional hydraulic lock, and the extension length of the annular extension part is smaller than that of a plunger rod, so that the plunger rod can penetrate through the annular extension part to drive a valve element; and a first gap for hydraulic oil to flow is formed between the outer wall of the annular extension part and the inner wall of a valve body, and a second gap for hydraulic oil to flow is formed between the inner wall of the annular extension part and the outer wall of the plunger rod, and a plurality of throttling channels for hydraulic oil to flow between the first gap and the second gap is further formed in the annular extension part. According to the bidirectional hydraulic lock, the propelling stroke of the plunger can be limited by the annular extension part, so that the situation that the plunger rod is deformed or broken due to an overlarge force can be avoided, the service life of the hydraulic lock is prolonged, and the bidirectional hydraulic lock is relatively smooth and steady in the working process.
Owner:宁波善研液压有限公司

Transient active control method of energy storage power station

The invention discloses a transient active power control method for an energy storage power station, and belongs to the technical field of multi-infeed extra-high voltage AC / DC hybrid power grids, andthe control method comprises the steps: continuously detecting the real-time DC current of an inversion side and the AC bus voltage of the inversion side; when the real-time direct current is greaterthan a first current threshold value or the alternating current bus voltage is less than a voltage threshold value, controlling the energy storage power station to enter a transient control mode; determining an output time instruction corresponding to the energy storage active output by using the size relationship between the real-time direct current and a first current threshold value and a second current threshold value, wherein the first current threshold value is greater than the second current threshold value; determining by utilizing the size relationship between the alternating currentbus voltage and the voltage threshold value; and sending an energy storage active instruction of the target output amplitude to the energy storage power station at the target output moment accordingto the output time instruction and the output amplitude instruction. According to the control method provided by the invention, the energy storage active power output is applied to the field of commutation failure suppression, and the continuous commutation failure after the DC fault can be effectively suppressed.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Energy storage transient power coordination control method for suppressing subsequent commutation failure

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.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Method for obtaining filter coefficient and torque filter method and system for hybrid electric vehicle

The invention provides a method for acquiring filtering coefficient, and a torque filtering method and system for a hybrid power vehicle. The method for acquiring the filtering coefficient includes: acquiring current working condition modes of an engine, a first electric motor and a second electric motor, determining a filtering coefficient of the engine, a filtering coefficient of the first electric motor and a filtering coefficient of the second electric motor according to the current working condition modes of the engine, the first electric motor and the second electric motor; acquiring a larger value from the filtering coefficient of the first electric motor and the filtering coefficient of the second electric motor, comparing the larger value and the filtering coefficient of the engine to acquire a smaller value from the larger value and the filtering coefficient of the engine, and using the smaller value as a final torque filtering coefficient; and finally performing first order inertia filtering according to the final torque filtering coefficient. The final torque filtering coefficient can be determined by compressive consideration of the filtering coefficients of the engine, the first electric motor and the second electric motor in the current working conditions; a current output torque of the whole vehicle can follow the desired torque of a driver timely and accurately, and the demand of a hybrid power automobile for torque filtering can be met.
Owner:BEIJING BORGWARD AUTOMOBILE CO LTD

Groove machining blade

The invention discloses a groove machining blade. The groove machining blade is defined by an upper positioning surface, a lower positioning surface, two side surfaces and two end surfaces, wherein the two side surfaces and the two end surfaces connect the upper positioning surface with the lower positioning surface. A front cutter surface connecting the upper surface with at least one of the end surfaces is arranged between the end surface and the upper positioning surface. Two side rear cutter surfaces are arranged between the single front cutter surface and the adjacent end surface as well as between the single front cutter surface and the adjacent side surface correspondingly. The side rear cutter surfaces, the end surfaces and the front cutter surface intersect to form a side edge and an end edge correspondingly. The end edge of a double-edged structure is composed of an upper end edge body and a lower end edge body. The groove machining blade has the characteristics of being high in chip breaking ability, high in machining surface quality, long in life and high in cutting efficiency.
Owner:刘辞海

Vibration reducing device, vibration screen and asphalt mixing station

The invention relates to a vibration reducing device, a vibration screen and an asphalt mixing station. The vibration reducing device comprises a material holding part (26) and a motion part; bulk materials are filled in the material holding part (26); one end of the motion part is connected with the vibration part, and the other end extends into an inner cavity of the material holding part (26); and the motion part can perform a reciprocating motion in the bulk materials when the vibration amplitude of the vibration part exceeds a preset value, so that the energy generated by vibration is dissipated through friction and collision between the bulk materials and between the motion part and the bulk materials, and the vibration of the vibration part is reduced. The vibration reducing device can effectively reduce the vibration of the vibration part to prolong the service life of equipment of the vibration part, is simple in structure, and can prevent direct acute impact generated in the vibration reducing process.
Owner:JIANGSU XCMG CONSTR MASCH RES INST LTD

Bundled fine dried noodle flush device and fine dried noodle packaging line

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.
Owner:DENGFENG QIMINGXUAN PROGRAM CONTROL EQUIP

Tripping control system of BPRT unit transmission clutch and control method of tripping control system

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.
Owner:XIAN SHAANGU POWER

Restarting method

The invention discloses a restart method. The method comprises a structure including a voltage detection module, a current detection module, a timer and an output closing relay which are arranged in an intelligent protector. The method is characterized in that: according to parameters of different motors and contactors, setting thresholds of recovery voltage and dropout voltage, setting one time threshold of delay closing time and inputting the threshold into the intelligent protector for setting a restart mode. The restart method comprises a power on automatic start mode and a power on restart mode. The method has combined functions of restart, flexible delay and accurate detection of system voltage and can avoid series impact on a system caused by the start of a large motor or simultaneous start of a plurality of motors and damages to a motor due to the forced start of the motor when the system is under system voltage.
Owner:SHANGHAI HUAJIAN ELECTRICAL EQUIP

Quick double-null-line wire threading device

The invention discloses a quick double-null-line wire threading device. The quick double-null-line wire threading device comprises a water absorption column, an air pipe and a plurality of air nozzles, a roller is arranged in the water absorption column, an arc-shaped backflow plate is obliquely arranged on one side of the water absorption column close to the air pipe, the inner wall of the air pipe is provided with a protrusion, and the air pipe on the same side of the protrusion is provided with a plurality of via holes; the air nozzles are provided with conical air gathering cavities inside, the internal diameter of the air gathering cavities decreases along the wind direction, airflow in the air inlet holes injects to the inner walls of the upper portions of the air gathering cavities from the front side, adjusting rings are rotationally arranged in the two air inlet holes, and screw protrusions are fixed on the inner walls of the air outlet holes. Airflow in the two air inlet holes changes its direction via the expanding section A, the straight section and the expanding section B and is reflected continuously via the inclined inner walls of the expanding section A and the expanding section B to finally form stable-velocity airflow to be ejected from the tail end of the expanding section B. Accordingly, rate of rotational flow due to non-uniform local stress on the inner walls of the air gathering cavities is decreased.
Owner:CHENGDU XINGDA OF COPPER CO LTD

Jacking positioning device

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.
Owner:深圳市大族锂电智能装备有限公司

Train wheel and rail turnout device capable of reducing wheel-rail impact influence

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.
Owner:EAST CHINA JIAOTONG UNIVERSITY

Anti-impact spring chair

PendingCN111820647AProtection securityEliminate direct action of lateral forceOffice stoolsChairsCushion
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.
Owner:HUATING COAL GRP

A hydraulic support intelligent liquid supply pump station and its control method

The invention relates to an intelligent liquid supply pump station for a hydraulic support and a control method thereof. When the hydraulic support requires a large amount of liquid, a large-flow variable-frequency pump and a small-flow servo pump are simultaneously activated to avoid low frequency of the variable-frequency motor-pump set. For unstable liquid supply during work, open the unloading valve to unload the large flow pump, only the emulsion discharged from the small flow servo pump enters the hydraulic support until the working frequency of the large flow pump gradually increases to a stable frequency, close the unloading valve At the same time, the speed of the small flow servo pump is reduced to realize the stable liquid supply of the large flow pump; when the liquid demand of the hydraulic support is small, only the small flow servo pump is turned on. This application utilizes the displacement sensor in the push cylinder to provide real-time feedback and hydraulic monitoring of the running process of the support, to control the liquid supply volume of each pump in the system in advance, to stabilize the pressure of the emulsion pump station, to avoid severe impact, and to eliminate the long power of the hydraulic support. Hysteresis effect on pressure response during distance transfer.
Owner:CHINA UNIV OF MINING & TECH +1

An air duct for copper wire water treatment

The invention discloses an air pipe for water-treated copper wires. The air pipe comprises an air pipe body and a plurality of air nozzles, wherein bulges are arranged on the inner wall of the air pipe body, and a plurality of wire penetrating holes are formed in on the air pipe at the same side with the bulges; cone-shaped air concentrating cavities with the inner diameters gradually decreasing along the air direction are formed in the air nozzle bodies; airflow in air inlets is directly projected to the inner walls of the upper parts of the air concentrating cavities; a regulating ring is rotatably arranged in the middles of the two air inlets, and spiral bulges are fixed on the inner walls of the air outlets. Airflow in the two air inlets does continuous acceleration, constant-speed and deceleration motions in the air inlets by virtue of the flow direction variation in an expansion section A, a flat section and an expansion section B, finally forms a jet of flow-speed-stabilized airflow by virtue of continuous reflection of oblique inner walls of the expansion section A and the expansion section B and is sprayed out from the tail end of the expansion section B, so that the probability that a small jet of rotational flow is formed by airflow because the inner walls of the air concentrating cavities are not locally and uniformly stressed is reduced.
Owner:CHENGDU XINGDA OF COPPER CO LTD

Safety valve structure capable of avoiding impact of valve clack during opening and closing and method thereof

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.
Owner:ZHEJIANG UNIV

Hydraulic suspension type reactor shutdown rod and working method thereof

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.
Owner:XIAN THERMAL POWER RES INST CO LTD

Flexible DC power transmission system fault ride-through voltage margin control method and device

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.
Owner:NANJING NARI GROUP CORP +1

Complex plant extracts, compositions and methods of use for controlling the growth of Clado algae

The invention relates to a compound plant extract, a composition and a use method for controlling the growth of Cladophyllum, belonging to the technical field of seawater pond culture. The compound plant extract is liquid, and the components include thyme extract, perilla extract, Peppermint extract, eucalyptus leaf extract, clove extract, co-solvent and solubilizer, the composite plant extract is uniformly mixed with biochar, zeolite powder, bentonite, and starch to make granules. The method can not only effectively control the abnormal growth of Cladoella in mariculture ponds, but also improve and optimize the culture environment without affecting the growth of culture objects, and effectively solve the problems of environmental deterioration and secondary pollution caused by drug control of algae growth in the prior art.
Owner:OCEAN UNIV OF CHINA +1
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