97results about How to "High action sensitivity" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The present invention provides a distribution transformer neutral line breaking protection device which comprises a neutral line breaking signal sampling circuit, a controllable silicon control loop and an AC contactor execution loop. The neutral line breaking signal sampling circuit comprises a voltage dividing resistor R and a varistor RU. The controllable silicon control loop comprises a controllable silicon V1, a rectifier diode V2 and a relay. The AC contactor execution loop comprises an AC contactor. According to the distribution transformer neutral line breaking protection device, through detecting neutral line abnormal overvoltage, the AC contactor is controlled to disconnect a distribution transformer low voltage side output power supply, and the damage to a single-phase electrical appliance caused by distribution transformer low voltage side neutral line breaking is avoided. The distribution transformer neutral line breaking protection device has the advantages of simple and reasonable circuit design, high action sensitivity, ideal operation characteristics, safety and reliability, the device can be widely used in the power supply line of a rural power distribution system public transformer and is used as a distribution transformer neutral line breaking protection device, and the safety of power supply is ensured.