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97results about How to "High action sensitivity" patented technology
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Current differential protection method for built-in winding mutual inductor of three-phase transformer
ActiveCN102142672AImprove correct action rateHigh action sensitivityEmergency protective circuit arrangementsInductorThree phase transformer
The invention provides a current differential protection method for a built-in winding mutual inductor of a three-phase transformer. Current mutual inductors are installed at the two ends of each phase winding of the inner part of a duplex winding, three-winding or other multi-winding transformer to form current differential protection based on measuring current of two end heads of each winding. The data collected by each current mutual inductor is processed, the difference of the measuring current of two end heads of each winding forms differential current, and 0.05-0.2 time of rated current of the side transformer is used as the action threshold value of the differential current. The differential current is compared with a differential protection action current setting value. When the differential current is larger than the setting value, the winding differential protection acts according to the setting action time, and meanwhile a breaker of each side of the transformer is disconnected to eliminate winding faults. The current differential protection method is not influenced by inrush current, can effectively increase the sensitivity and rapidity of inner fault protection action of the transformer, does not delay to eliminate various shorted faults of the transformer windings, and obviously increases the correct action rate of transformer protection.
Owner:重庆峰极智能科技研究院有限公司
Touch panel and dynamic control method thereof
InactiveCN102955600ADynamically adjust resolutionDynamically adjust signal gainInput/output processes for data processingImage resolutionHuman–computer interaction
The invention provides a touch panel and a dynamic control method thereof. The dynamic control method for a touch panel, includes the steps of: providing a dynamic resolution control circuit for configuring a touch panel to possess a first resolution and a second resolution; and providing an induced signal gain control circuit for configuring the touch panel to have a first gain corresponding to the first resolution, and a second gain corresponding to the second resolution, wherein, the resolution of the touch panel will change from the first resolution to the second resolution when an object is within a distance from the panel. In addition, the present invention further presents a touch panel system and a dynamic control method for adjusting the sensitivity of a touch panel.
Owner:RICH IP TECH
Torque overload protector
A torque overload protector comprises a main shaft end cover shaft. According to the structure of the torque overload protector, a steel ball is embedded into a main shaft groove, a clutch disc is attached to the steel ball, the other face of the clutch disc is attached to a disk-shaped spring, a main shaft sleeve abuts against the disk-shaped spring, and a lock nut is screwed in the other side of the main shaft sleeve to apply preload to the disk-shaped spring. The end cover shaft is fixed on a combination sleeve through an inner screw. The torque overload protector has the advantages that the structure is simple, assembly is easy, and the maintenance cost is effectively reduced; the action sensitivity is high during overloading, and the automatic working recovery capacity is achieved; the torque regulating range is wide, use is convenient and precise, and the technical problems that in the prior art, the structure is complex, assembly is tedious, and the applicability is poor are solved.
Owner:LIAONING INST OF SCI & TECH
Marine haulage device and emergency release method thereof
The invention relates to a marine haulage device and an emergency release method thereof, which belong to the technical field of marine machines. An upper roller clutch (3) is mounted on the output shaft of an upper roller-driving motor (5), a lower roller clutch (4) is mounted on the output shaft of a lower roller-driving motor (6), the output ends of the upper roller clutch (3) and the lower roller clutch (4) are respectively and fixedly connected with small gears (1), the control end of the upper roller clutch (3) is connected with an upper roller clutch controller (54), and the control end of the lower roller clutch (4) is connected with a lower roller clutch controller (64). The upper roller clutch (3) and the lower roller clutch (4) can be synchronously disengaged to carry out emergency release. The transmission torque of the clutches is low, action is quick, sensitivity is high, the clutches can be quickly engaged and disengaged, operation is flexible and reliable, and thereby the invention can fully meet the requirement of International and domestic emergency release action standards.
Owner:WUHAN MARINE MACHINERY PLANT +1
Constant-force floating system
ActiveCN107498467AFlexible operationRealize grindingFluid-pressure actuator testingServomotor componentsConstant forceControl engineering
The invention discloses a constant-force floating system, and relates to the technical field of industrial automatic equipment. The constant-force floating system comprises a controller, a constant-force floating unit, an electric servo valve and a force sensor. The constant-force floating unit can achieve constant-force work, the force sensor can detect constant force and transmits the constant force information to the controller, and the controller conducts active adjustment or makes a decision according to the sensor information to control the electric servo valve so as to control flow input into the constant-force floating unit for constant force adjustment. According to the constant-force floating system, the constant force of the constant-force floating unit can be actively controlled through the controller preset program, real-time adjustment can be conducted according to feedback during using, operation of multiple situations can be achieved, the controllable degree is high, the adjusting speed is high, and precise grinding, cutting and other technology machining are particularly facilitated.
Owner:SUNRISE INSTR CO LTD
HVDC power-transmission whole-line speed protection method by using direct-current filter current
ActiveCN102522733AImprove reliabilityFast actionEmergency protective circuit arrangementsFault location by conductor typesPower flowEngineering
The invention relates to a power-system direct current power transmission line relay protection field and especially relates to a single-terminal electric-quantity whole-line quick action protection method which can be used to identify faults in and out of an HVDC transmission line area. An amplitude of a specific frequency component in a single-terminal direct-current filter branch is used to realize discrimination of the faults in and out of the area. The method of the invention is used to protect a single-terminal whole-line quick action in the direct current power transmission line of the power system. The protection can be achieved only by using the single-terminal electric quantity. The method has a low requirement to a sampling frequency. An algorithm is simple. Sensitivity is high. The method can be realized during engineering. The action speed is fast, selectivity is good and reliability is high. A theory is completed and is easy to be adjusted. The protection method of the invention can replace current traveling-wave protection which is taken as the main protection of the direct current power transmission line. And the method is especially suitable for realizing the whole-line quick action protection of the ultra / super HVDC power transmission line by using the single-terminal electric quantity.
Owner:XI AN JIAOTONG UNIV
Internal combustion engine negative pressure sensor
InactiveCN101021450AImprove relevanceGood synchronizationInternal-combustion engine testingFluid pressure measurement using magnet displacementIntake pressureEngineering
Navigate pressure sensor of internal-combustion engine uses electromagnetic element to measure its admission pressure. Set a diaphragm 5 between main body 1 and end cap 12. Inner space of 1 is divided into a negative pressure chamber B1 and a stable pressure chamber C1 by a spring base 2, which has a damped pore 17. B2 connects with blow hole A1. A spring with gather elasticity is set between 2 and 5. The other side of 5 has a magnet 15, to which sets a Hall element 14 in 12. The invention has merits of sensitive reaction, high action precision, extensive measuring range, high working stability, small capacity, low cost and convenient equipment. It can reflect workload change of internal-combustion engine exactly and can be applied to determine admission pressure and workload of various internal-combustion engines.
Owner:应城市新世纪摩托车配件有限责任公司
Method for judging and protecting low voltage in transformer short circuit fault
InactiveCN101800414AHigh action sensitivityImprove reliabilityEmergency protective circuit arrangementsElectrical testingTransformerLow voltage
The invention relates to a method for judging and protecting low voltage in transformer short circuit fault, which comprises the following steps of: (1) measuring a phase voltage on one side of a wiring transformer by a protection device; (2) calculating a magnitude of line voltage between each two voltages on one side in the step (1) by the protection device; and (3) respectively comparing the magnitude of the phase voltage and the magnitude of the line voltage on one side in the step (2) with a setting value to form low voltage criterions, and forming an or gate output by all the low voltage criterions. After the application of the method, when all sides of the transformer are in a state of interphase short circuit and a neutral grounding system is in a state of single-phase grounding, one of the measured voltages is bound to be zero, the setting value can take a low value so as to ensure that a low voltage starting criterion can still have high action sensitivity and improve the reliability of non-maloperation during normal operation; and the low voltage setting value can enable a current setting value of an overcurrent criterion to take a low value so as to improve the action sensitivity of the overcurrent criterion. The invention has few channels to be protected and simple hardware.
Owner:XJ ELECTRIC +2
Ground fault protection method of nuclear plant low-voltage power distribution system in all power supply ranges
ActiveCN103683225AHigh sensitivitySmall sizeEmergency protective circuit arrangementsLow voltageDistribution power system
The invention belongs to the nuclear plant design technology, and particularly relates to a ground fault protection method of a nuclear plant low-voltage power distribution system in all power supply ranges. According to the method, a ground protective relay is arranged on the connecting line of a neutral point of a medium-and-low-voltage distribution transformer and a ground system. The ground protective relay is a two-stage electric leakage relay, a first-stage electric leakage warning function is achieved so as to prevent ground arc fires in all the power supply ranges, and a second-stage ground fault tripping function is achieved so as to carry out ground fault protection on the whole low-voltage power distribution system. Residual current protective devices in cascading matching are arranged in the power distribution system, a main feeder circuit is provided with an arc-fire protector, a rear end circuit is provided with a body electric shock protector, and multiple layers are standby. By means of the method, the problems of ground arc fires and indirect contact electric shock are solved in the nuclear plant low-voltage power distribution system in all the power supply ranges, and safety of the low-voltage power distribution system is effectively guaranteed.
Owner:CHINA NUCLEAR POWER ENG CO LTD
Eccentric type control device
InactiveCN1807220ASimple structureHigh action sensitivityWinding mechanismsAgricultural engineeringSignal detector
The invention relates the eccentric type control device. The eccentric type control device has the advantages of simple structure, sensitive action, high safety and reliability and low cost. The device comprises armored rope, bed plate, eccentric shaft, bearing seat, pulley, bearing, swinging arm, support stand, spring, spring seat, displacement signal detector and adjusting bolt. The armored rope is looped around pulley, the bearing seat is installed on bed plate, the two ends of eccentric shaft is connected with bearing seat, the pulley is installed on eccentric shaft by bearing, one end of swinging arm is connected with eccentric shaft, the displacement signal detector and spring seat is installed on the other end of swinging arm, the other end of spring seat is installed on support stand, the bottom of support stand is fixed on bed plate, the displacement signal detector is connected with one end of adjusting bolt, and the other end of adjusting bolt is installed on upper support stand.
Owner:陈毅斌
Electromagnetic driver with elastic resetting mechanisms
InactiveCN105546197AWith characteristicsWith progressOperating means/releasing devices for valvesEngineeringElectrical drive
The invention provides an electromagnetic driver with elastic resetting mechanisms. According to the scheme, the electromagnetic driver comprises a pin sleeve and a valve outer shell fixed on the pin sleeve, valve pins are arranged in the pin sleeve, electrical driving mechanisms capable of pushing the valve pins to move are arranged in the valve outer shell, and each electrical driving mechanism comprises an inner yoke sleeve, an electromagnetic solenoid and a magnetic core, wherein the magnetic core is arranged in the inner yoke sleeve which is wound with the electromagnetic solenoid, the magnetic core can move in the inner yoke sleeve and push the corresponding valve pin to move through a push rod; the elastic resetting mechanisms are arranged between the magnetic cores and the valve outer shell. By means of the electromagnetic driver with the elastic resetting mechanisms, effective cushion protection can be conducted on resetting of the magnetic cores, and meanwhile the response speed of the magnetic cores can be increased.
Owner:CHENGDU FULIN PRECISION AUTOMOTIVE COMPONENTS CO LTD
Underground deep layer seismic monitoring system and working method thereof
InactiveCN101118286AImprove accuracyLess distracting factorsSeismic signal receiversIntegrative data analysisEarth crust
The present invention provides an underground depth earthquake monitoring system and comprises a deep well wrapper tube. The present invention is characterized in that the present invention consists of an underground vibration monitoring device and an overground earthquake monitoring signal receiving and signal recognition system; the underground vibration monitoring device consists of an underground electric current vibration meter central device, a sensing hemisphere guard shield, a horizontal plumb, and a suspension metal cable of the monitoring device sensor, as well as a signal transmission line. The working method of the present invention is as follows: firstly, the earthquake monitoring point is confirmed; secondly, the underground depth earthquake monitoring system is arranged, and a matrix form multistep earthquake monitoring network is formed; thirdly, the earth crust vibration situation is gathered, processed, analyzed and stored; fourthly, the earth crust vibration situation in the area or the city through the comprehensive data analysis is determined. The present invention has the advantages of high accuracy of the earthquake monitoring; simple method and reliable result; good signal specificity; high measuring accuracy, and high movement sensitivity of the device.
Owner:张维耀
Automatic explosion-proof device for underground coal mine
InactiveCN111779530AEasy to operateReduce processing difficultyMining devicesDust removalMining engineeringCoal dust
The invention relates to the technical field of protective equipment for an underground coal mine, in particular to an automatic explosion-proof device for the underground coal mine. The automatic explosion-proof device for the underground coal mine comprises a pressure receiving mechanism, a triggering mechanism and a reaction mechanism which are connected in sequence, wherein the triggering mechanism comprises a pressure chamber; an axle center casing pipe is arranged in the pressure chamber; air leakage holes are uniformly formed in the middle position of the axle center casing pipe aroundthe circumference of the cross section of the pipe wall; a triggering piston is arranged in the axle center casing pipe, and is of a cylindrical structure with an axle center cavity; no less than twosealing grooves are formed in the outer circumference of the front end of the triggering piston; an air leakage groove is formed between the adjacent sealing grooves; and an air delivery hole is formed in the bottom of the air leakage groove and is connected to the axle center cavity of the triggering piston. When gas and coal-dust explosion occurs in the underground coal mine, the explosion flameis quickly extinguished to prevent the flame from continuing to spread and trigger more harmful secondary explosion by adopting the automatic explosion-proof device which has the mechanical structure, little processing difficulty and relatively sensitive action.
Owner:山东久泰煤安装备有限公司
High-precision double-head labelling machine
ActiveCN107021275AImprove labeling efficiencyReduce manufacturing costLabelling machinesEngineeringVisual positioning
The invention discloses a high-precision double-head labelling machine. The high-precision double-head labelling machine comprises a worktable, two labelling head assemblies, a first vision positioning assembly and two second vision positioning assemblies, wherein a supporting frame is arranged on the worktable; a first flat plate and a second flat plate which are vertically arranged in parallel are arranged on the supporting frame; transverse guide rails are respectively arranged on the two sides of the second flat plate. The two labelling head assemblies are movably arranged on the transverse guide rails and can slide reciprocally on the transverse guide rails. The first vision positioning assembly is used for positioning a labelled product and is movably arranged on the first flat plate. The two second vision positioning assemblies are respectively arranged on the two sides of the labelled product on the worktable and are used for detecting the appearance of a label to be labelled. The high-precision double-head labelling machine can meet the production requirements on high-precision and high-efficiency labelling production.
Owner:深圳市诺峰半导体设备有限公司
Mousetrap
The invention discloses a mousetrap. A triggering mechanism of the mousetrap comprises a support rod capable of moving up and down relative to a front side plate. A box body is provided with a support locking mechanism which can rotate relative to the box body and support the support rod, a transmission rod is hinged to the front side plate and provided with a clamping position which can be clamped with a lock-clamping part on the support locking mechanism, the box body is further provided with a motor, an inhaul cable which can pull the transmission rod to rotate downward is arranged between an output shaft of the motor and the transmission rod, a reset spring for the resetting of the transmission rod by rotating upward is arranged between the transmission rod and the box body, a top cover is provided with a tread plate which moves downward after being trampled by a mouse, the tread plate and the top cover are respectively provided with conductive contact pieces which can contact to make the motor rotate with power when the thread plate moves downward, a return spring is further arranged between the tread plate and the top cover to separate the conductive contact pieces on the tread plate and on the top cover. The mousetrap has the advantages of being simple in structure, sensitive in action and good in mouse catching effect.
Owner:方鹏羽
Electromagnetic elevator limit switch device
ActiveCN105489408AWith dustproofInsulationContact driving mechanismsContact operating partsElectric controlElectromagnet
The invention relates to the field of electric control technology, and particularly to an electromagnetic elevator limit switch device. The electromagnetic elevator limit switch device comprises the components of a small housing assembly, a housing assembly, a conversion assembly, a closing assembly and an electromagnet assembly. After the electromagnet assembly is energized, the electromagnet assembly transmits an acting force to a dynamic contact connecting rod for making a spring bear a force. The spring makes a dynamic contact silver nail on a dynamic contact connecting rod switch between an off state and an on state on a static contact silver nail on a contact pole, thereby realizing small stroke, high positioning precision and high control flexibility. The electromagnetic elevator limit switch device is advantageous in that the electromagnetic elevator limit switch device is composed of the small housing assembly, the housing assembly, the conversion assembly, the closing assembly and the electromagnet assembly; when the swing rod bears a force with a preset magnitude, the swing rod immediately drives the conversion assembly for switching between the off state and the on state on the small housing assembly of the switch; the housing assembly and the closing assembly realize necessary protection on the switch, thereby obtaining controllable integral safety, higher reliability in switching-on and switching-off, and improving closing performance and insulating performance.
Owner:上海华晟电器有限公司
Electric servo valve
PendingCN107559459AHigh action sensitivityOperating means/releasing devices for valvesMultiple way valvesEngineeringMechanical engineering
The invention discloses an electric servo valve. The electric servo valve comprises a servo motor, a valve body and a valve element; an output shaft of the servo motor is fixedly connected with one end of the valve element; the valve element is positioned in the valve body; a first ventilation groove is formed in the peripheral direction of the valve element; the valve body is provided with a first intake port and a first exhaust port in the positions passing through the cross section of the first ventilation groove; and when the valve element rotates to a certain angle, the first intake port,the first ventilation groove and the first exhaust port communicate with each other. The electric servo valve realizes the flow and air circuit control through driving by the servo motor, the valve body and the valve element, and integrates such performances as high action sensitivity, excellent flow adjustment dynamic performance and integration of air pressure adjustment and air circuit change.
Owner:SUNRISE INSTR CO LTD
Double-speed segmented contact of ultrahigh voltage
InactiveCN1747094AThe overall structure is simple and reliableReduce volumeHigh-tension/heavy-dress switchesAir-break switchesEngineeringBreaking capacity
Owner:王光顺
Line current differential protection method capable of preventing influences of both transitional resistance and load current
ActiveCN103248024ANot affected by motion performanceReliable brakingEmergency protective arrangements for automatic disconnectionElectrical resistance and conductanceHigh resistance
The invention discloses a line current differential protection method capable of preventing influences of both transitional resistance and load current. According to the method, the differential current is calculated by utilizing current on two sides of a transmission line; the protection criterion molecular calculated value is obtained through phase of the current of the transmission line and the differential current; the minimum value of the three-phase current is multiplied by the difference value of the differential current and the current on the two sides to obtain the protection criterion denominator calculated value; and then whether the current differential protection sends out an action trip signal is determined by whether the ratio of the protection criterion molecular calculated value and the protection criterion denominator calculated value is larger than the setting coefficient. The method provided by the invention can achieve reliable braking in case of an external failure of the transmission line, has very high action sensitivity in case of an internal failure of the transmission line, and can act sensitively and reliably when the transmission line falls into a single-phase high-resistance ground fault, and the action performance is free from the influences of both load current and transitional resistance.
Owner:STATE GRID CORP OF CHINA +2
Directional current differential protection method of power transmission line
ActiveCN103296647AHigh action sensitivityAction performance is reliable and correctEmergency protective circuit arrangementsCurrent transformer saturationTransmission line
The invention discloses a directional current differential protection method of a power transmission line. The method includes computing a real part of a ratio of current of one end of the power transmission line to current of the other end of the power transmission line, dividing the real part of the ratio of the current of one end of the power transmission line to the current of the other end of the power transmission line by an absolute value of the real part of the ratio of the current of one end of the power transmission line to the current of the other end of the power transmission line to obtain a direction coefficient and utilizing the direction coefficient, differential current, braking current and a current set value to form directional current differential protection criteria of the power transmission line. Action performance is unaffected by unbalanced current, and action sensitivity is high. Whether current transformers are saturated or not, action can be carried out reliably and accurately when faults occur in a power transmission line protection area, locking can be performed reliably and accurately when faults occur outside the power transmission line protection area, and action performance is unaffected by saturation of the current transformers.
Owner:STATE GRID CORP OF CHINA +3
Joint module and collaborative robot
The invention relates to a joint module and a collaborative robot. The joint module comprises a shell, an input shaft, a driving motor, a brake and a grating absolute encoder, wherein the driving motor is arranged inside the shell, the driving motor comprises a stator and a rotor, the stator is arranged on the shell, and the rotor is arranged on the input shaft and can rotate relative to the stator; the brake is disposed inside the shell, the brake comprises an elastic reset member, a brake magnetic steel sheet, a dynamic friction plate and a static friction plate, the static friction plate isarranged on the shell, the elastic reset member is arranged on the rotor, the brake magnetic steel sheet is connected with the elastic reset member, and the dynamic friction plate is connected with the brake magnetic steel sheet and can be in contact with or separated from the static friction plate; and the grating absolute encoder is disposed inside the brake. The integration and light weight ofthe whole joint module are greatly improved, and the volume and quality of the joint module can be effectively reduced.
Owner:GUANGDONG BOZHILIN ROBOT CO LTD
Remote-controlled omnidirectional mobile manipulator and control method thereof
InactiveCN104999454AIncrease flexibilityStrong handlingProgramme-controlled manipulatorControl signalThree degrees of freedom
The invention provides a remote-controlled omnidirectional mobile manipulator and a control method thereof, and relates to the field of a remote-controlled manipulator. The invention aims at solving the problems that a conventional mobile robot is large in size and poor in flexibility of directional walking and controllability and can not realize multi-node networking. A three-axis acceleration sensor of a remote controller is swung and collects three-axis motion data; a second microprocessor is used for sending the three-axis motion data to a first microprocessor; the first microprocessor is used for controlling four omnidirectional wheels according to the received three-axis motion data, so that the remote-controlled omnidirectional mobile manipulator moves; a key is pressed and sends a motion control signal to the first microprocessor through the second microprocessor, the first microprocessor controls an infrared obstacle avoidance module to detect the position of an obstacle and controls a three-degree-of-freedom grabbing manipulator to swing and grab the obstacle according to the position of the obstacle and the received motion control signal. The swinging remote-controlled device can be used for remotely controlling the manipulator.
Owner:HEILONGJIANG UNIV
Pilot type safety valve
ActiveCN104100747ASmall pressure lossHigh action sensitivityEqualizing valvesSafety valvesPiston ringEngineering
The invention relates to a pilot type safety valve which comprises a main valve and a pilot valve. The main valve comprises a main valve body, a main valve clack, a main valve stem, a main valve bonnet, a main valve spring, a piston, a piston ring, packing and a guide pipe, the pilot valve comprises a pilot valve pressure guide pipe, a pilot valve body, a pilot valve clack, a pilot valve stem, a pilot valve bonnet, a pilot valve spring and a guide sleeve, a pilot valve discharge channel is arranged on the main valve bonnet, and the main valve bonnet and the pilot valve body are connected with each other by bolts to form an integral structure. The pilot type safety valve has the advantages that environmental pollution can be prevented, the service life of the pilot type safety valve can be prolonged, and the cost can be saved.
Owner:YANGZHONG VALVE FACTORY CO LTD
Brake apparatus for capstan of winch
ActiveCN107387607ARealize lockEasy to operateBraking membersBrake actuating mechanismsBrakeClassical mechanics
The invention belongs to the technical field of marine winches, and particularly relates to a brake apparatus for a capstan of a winch. A brake ring of the device is formed in the mode that an upper brake arc plate and a lower brake arc plate are connected in a Hough section shape, and a matching ring is arranged at the end of the capstan in a penetrating mode; a support extends to the matching ring from a base, the adjacent ends of the two braking arc plates are coaxially hinged to the top of the support, and the axis of the hinged position is parallel to the axis of the matching ring; pull rods are arranged at the other ends relative to the hinged ends of the two braking arc plates in a penetrating mode respectively, the two pull rods are located on the same radial section of the matching ring, and the motion paths of the two pull rods avoid each other spatially; the brake apparatus further comprises a foot rest lever, a hinged support base is arranged on the base and hinged to the hinged support base, the bottoms of the two pull rods are hinged to the positions, on the two sides of the hinged support base, of a rod body of the foot rest lever respectively. The brake apparatus has the advantages of being simple in structure, low in manufacturing cost and low in operation and maintenance threshold, and the brake apparatus is extremely suitable for being used in a severe environment where a ship is located and meeting the maintenance requirements.
Owner:MINGGUANG CITY LIUXIANG PUMP IND
Novel small-head sewing machine
ActiveCN107227560AOvercome the disadvantage that the eye of the needle is easily pulled out of the long groove by the sewing needleOvercome the disadvantage of being easily pulled out of the long groove by the sewing needleWork-feeding meansNeedle severing devicesEngineeringSupport point
The invention discloses a novel small-head sewing machine, which is characterized by comprising a machine shell; an installing wall and a worktable; a main pressing pin for pressing fabrics to be sewed, a delivering mechanism, a push mechanism, and a lifting mechanism are arranged on the installing wall; the delivering mechanism comprise a sewing needle, a needle driving part, a swaying pressing pin, and a swaying pressing rod; a supporting point and a driving point are arranged on the swaying pressing rod; a pusher and a shearing mechanism are installed in the worktable; the pusher comprises a material pushing driving part and a cloth delivering tooth in opposite to the swaying pressing foot; the pusher is applied to the driving point, thus the swaying pressing rod and the sewing needle are crossly and repeatedly swayed around the supporting point; the lifting mechanism applies force to the swaying pressing rod, and the shearing mechanism is used for shearing the sewing line crossed through the sewing needle. Through three-synchronous delivering mechanisms, the novel small-head sewing machine overcomes the shortcoming that the needle eye is easy to be pulled out of a long slot by the sewing needle during the working process of a traditional two-synchronous delivering sewing machine; the sewed line trace is beautiful, the sewing quality is greatly promoted; the overall structure is compact, and the movement stability is high.
Owner:TAIZHOU SANBEN SEWING EQUIP CO LTD
Relay protection method for interphase short circuit faults of electric transmission line
ActiveCN103248019AOvercome the impact of protective action performanceHigh action sensitivityEmergency protective circuit arrangementsHigh resistanceElectrical resistance and conductance
The invention discloses a relay protection method for interphase short circuit faults of an electric transmission line. The relay protection method comprises the following steps: a voltage drop from an electric transmission line protection mounting part to an interphase short circuit fault point and a voltage drop from an electric transmission line protection setting range to the interphase short circuit fault point are calculated by using fault interphase electrical capacity at the electric transmission line protection mounting part, and if the angle between the voltage drop from the electric transmission line protection mounting part to the interphase short circuit fault point and the voltage drop from the electric transmission line protection setting range to the interphase short circuit fault point ranges from 90 degrees to 270 degrees, an action tripping signal is given out by a protection device. The method solves the problem of the influence of transition resistance and load current on the protection action performance, and when interphase high-resistance short circuit faults occur to the electric transmission line, the method can act correctly and reliably, the action sensitivity is high, and the protection range is stable.
Owner:STATE GRID CORP OF CHINA +2
Voltage protection method for interphase short circuit faults of electric transmission line
ActiveCN103248022ACorrect and reliable actionHigh action sensitivityEmergency protective circuit arrangementsTransmission lineEngineering
The invention discloses a voltage protection method for interphase short circuit faults of an electric transmission line. The voltage protection method comprises the following steps: calculating the voltage of an interphase short circuit fault point by fault interphase electric capacity at an electric transmission line protection mounting part, using the fault interphase voltage of the electric transmission line protection mounting part to minus the voltage of the interphase short circuit fault point to obtain a voltage drop from the electric transmission line protection mounting part to the interphase short circuit fault point, multiplying the voltage drop of a unit length electric transmission line by the protection setting range to obtain a voltage drop from the electric transmission line protection mounting part to the protection setting range, and judging whether the argument that the amplitude of the voltage drop from the electric transmission line protection mounting part to the interphase short circuit fault point is smaller than that of the voltage drop from the electric transmission line protection mounting part to the protection setting range is tenable, if yes, an action tripping signal is give out by a protection device. The method solves the problem of the influence of transition resistance and load current on the protection action performance, and when interphase high-resistance short circuit faults occur to the electric transmission line, the method can act correctly and reliably, the action sensitivity is high, and the protection range is stable.
Owner:STATE GRID CORP OF CHINA +2
Distribution transformer neutral line breaking protection device
InactiveCN104065035AReasonable and simple circuit designHigh action sensitivityArrangements responsive to excess voltageDistribution systemContactor
Owner:HENAN KAIQI POWER IND
Tripping mechanism of residual current circuit breaker
InactiveCN105070611AEliminate failure problemsEliminate security concernsProtective switch operating/release mechanismsElectronic control systemControl system
The invention discloses a tripping mechanism of a residual current circuit breaker. The tripping mechanism comprises a circuit breaker shell, a disconnection mechanism, a leakage current detection system, an electronic control system, an electromagnetic tripper and a tripping reset device and is characterized in that the tripping reset device comprises a reset element, a tripping connection rod, an installation shaft and a reset spring, the reset element is engaged onto the circuit breaker shell in a sliding way by the reset spring, the middle part of the tripping connection rod is connected below the reset element in a rotation way by the installation shaft, a movable iron core of the electromagnetic tripper is in transmission connection with one end of the tripping connection rod, a hook is further arranged at one end of the tripping connection rod and is buckled with or props against the reset element, and the other end of the tripping connection rod is in transmission connection with the disconnection mechanism. The tripping mechanism is exquisite in design, simple in structure, small in tripping force, high in action sensitivity and high in reliability, and a line failure and a potential risk caused by electric leakage can be eliminated better.
Owner:长城电器集团浙江科技有限公司
Visual magnetically-controlled switch
InactiveCN104779115AStrong extrusion resistanceNot easy to break and damageMagnetic movement switchesEngineeringOrganic glass
The invention relates to a visual magnetically-controlled switch. The visual magnetically-controlled switch comprises an outer tube, two reed switches and leads, wherein the outer tube is a transparent organic glass tube with two ends sealed, and the outer tube is filled with epoxy resin; the two reed switches are connected with the leads respectively and mutually connected in the outer tube. The switch has the inner visual performance and can perform visual operation, so that the switch state is distinguished more conveniently, and hidden danger is discovered more directly; the switch is free of rust, easy to dismount and high in seal and waterproof performance and has very high applicability to severe environments of shafts under mines; the magnetizing range is wide, the detection accuracy and the action sensitivity are high, and the detection error probability is greatly decreased; the switch is simple to produce, short in molding cycle and low in production cost.
Owner:NANJING MEISHAN METALLURGY DEV +1
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