36results about How to "Reduce discharge energy" patented technology

The invention discloses a stretch-forming and electromagnetic combining incremental forming method and device of a large thin-wall part. The method comprises the steps that a driving plate is arranged above a plate to be deformed, the driving plate and the plate to be deformed are clamped by a pressing plate and a supporting plate, and a lifting oil cylinder drives the supporting plate to move, so that the driving plate and the plate to be deformed are stretch-bent and tightened preliminarily, and the stretch-forming process is achieved; the position of an electromagnetic coil is adjusted, the electromagnetic coil is made to exactly face the driving plate to be deformed to discharge electricity, the coil rotates on the surface of the driving plate for a circle around the axis of a male die, and the plate to be deformed is attached to the male die at the same height; then, the oil cylinder descends again to stretch-bend the plate, the coil discharges electricity to deform the plate to be deformed again, the plate to be deformed is attached to the male die, and the alternate forming process of stretch-forming, discharging, re-stretch-forming and re-discharging of the plate is achieved in the same way till deformation of the plate is finished. The flowing evenness of materials can be improved, the thinning ratio of the plate can be reduced, and flexible processing and precise plastic manufacturing of large plates hard to deform can be achieved.

A wire-cut EDM method and apparatus for machining to a fine surface roughness of 1 mu m Rmax or less. Two power supplies and a electrode polarity switching system are used. A first high energy power source is used for initial profile cutting and may also be used for one or more later cuts while the machining pulse parameters, and feed rate and offset are adjusted for increasing less rough surface finishes. The wire electrode is held at negative machining potential. A second power supply and smaller offset values are used for later cuts to create lower values of surface roughness, while still maintaining the wire electrode at a negative machining potential. Finally, in order to create a fine finished surface (Rmax

The invention discloses a warm electromagnetic forming device of a skin piece. The warm electromagnetic forming device comprises a base plate, a die, a plate material and clamping plate assemblies used for fixedly clamping the plate material, the clamping plate assemblies are arranged on the base plate, the plate material is fixedly clamped between the clamping plate assemblies, the warm electromagnetic forming device further comprises a discharge coil and heating pieces used for heating the plate material, the discharge coil is arranged above the plate material, and the heating pieces are arranged on the two sides of the plate material. The invention further discloses a warm electromagnetic forming method which comprises the steps of plate material fixing, plate material stretch forming,plate material heating, electromagnetic forming and the like; and complete attachment of the plate material and a forming face of a mold is achieved by repeatedly executing plate material stretch forming, heating and electromagnetic forming. The warm electromagnetic forming device has the advantages that the forming accuracy is high, the forming quality is good, the forming efficiency is high, andthe requirement of the equipment for the discharge energy and the coil strengthen is low.

The invention discloses a method and a device for improving the performance of an intrinsic safety switching power supply in an explosive dangerous environment. By adoption of the method for detecting the change rate of a current by an inductor, a main circuit is cut off; the time of the current change during short circuit is delayed by the inductor to make the current start rising after a voltage is reduced to zero, so discharging energy during the occurrence of a fault is reduced; and the change rate of the current during the short circuit is controlled by the inductor, so the influence of electromagnetic interference (EMI) is reduced. A current differential measurer of the device is connected with an input end of a driving circuit; an output end of the driving circuit is connected with control ends of switches; the first switch is connected in series with a current-limiting inductor; the second switch is grounded by a load resistor (RL); the current-limiting inductor is connected in parallel with a diode; and the current-limiting inductor and the diode which are connected in parallel are grounded by the RL. The invention has the advantages that: the power of the intrinsic safety switching power supply is improved; the safety and reliability of an intrinsic safety system are improved; the change rate of the current is reduced; and the EMI is reduced.

The invention discloses a two-stage limited pulse width precision electrical discharge pulse power source. In the invention, an adjustable stabilized voltage source E1 is electrically connected with a current-limiting resistance array R1-Rn, a forestage FET Q1 and a discharge electrode anode P+ in sequence; a backward stage FET Q2 is electrically connected with the forestage FET Q1 in series, and is electrically connected with plus-minus discharge electrodes P+ and P- in parallel; the two FETs are inverting driven by high frequency and output rising edge and failing edge of the discharge pulse respectively to realize two-stage limited pulse width and limit the min output pulse width at 60ns, thus outputting microenergy discharge pulse.

The invention discloses a method for controlling the speed of a motor. The motor comprises a direct current motor, a gear speed reducer, a control module and a rotating speed detecting module, wherein the gear speed reducer is used for conducting speed reducing on output of the direct current motor, the control module controls the direct current motor to operate, and the rotating speed detecting module is used for detecting the operating speed of the direct current motor. The method is characterized by including the following steps that the rotating speed detecting module detects the real-time operating speed of the direct current motor; the control module automatically controls the direct current motor to operate according to signals detected by the rotating speed detecting module, the direct current motor is maintained at constant preset speed which does not change along with the load after the speed of the direct current motor is reduced through the gear speed reducer, and the preset speed is smaller than the operating speed of the motor when the motor is unloaded at nominal voltage. When the direct current motor is a curtain motor, the preset speed is smaller than the operating speed of the curtain motor when the curtain motor is at nominal load, and the curtain motor is maintained at preset speed in a PWM speed regulating mode. When the direct current motor is a direct current tubular motor, the preset speed is smaller than the uplink speed of the direct current tubular motor when the direct current tubular motor is at nominal load.

The invention discloses a stimulated experiment system for gas detonation by human body electrostatic discharge, comprising a mixed gas cavity and an ignition device positioned in the mixed gas cavity, wherein the ignition device is controlled by a human body ESD (Electro-Static Discharge) model and carries out ignition; the mixed gas cavity is communicated with a gas tank through an electromagnetic valve and is connected with an oxygen concentration sensor, a gas concentration sensor and a temperature sensor, the human body ESD model, the ignition device, the oxygen concentration sensor, the gas concentration sensor and the temperature sensor are all connected with a computer control system, and the computer control system is connected with a display device. The system of the invention excites gas in the mixed gas cavity to carry out detonation through the human body ESD model and accurately provides values of gas concentration and oxygen concentration upon gas detonation through the infrared gas concentration sensor, an infrared analyzer, the oxygen concentration sensor and the like, thus both the technical support for human body electro-static safe protection in coal mine environment and the foundation for manufacturing electrostatic preventing working uniform of miner are offered.

The invention relates to an automatic blood mixing device for laboratory. The front end of the base is provided with a motor, the output end of the motor is connected with the input end of a gearbox, and a small bevel gear is arranged on the output shaft of the gearbox. The small bevel gear Fit together with the large bevel gear, the large bevel gear is connected with the rotating platform through the connecting rod, the bottom end of the connecting rod is provided with a rotary encoder, and the control device is provided at the rear end of the base; the control device communicates with the motor and speed changer through the data line The boxes are connected together, and the output end of the rotary encoder is connected with the control device. The motor is a DC motor, and the rotary encoder includes a speed detection module for detecting the running speed of the DC motor. Balance detection system. The control device includes a control module operated by a DC motor, and the blood automatic mixing device for laboratory can save manpower to mix, save manpower, and improve work efficiency.

A mining isolated type intrinsic safety LED driving power source comprises an input rectification filter circuit, an isolation transformer, an output filter circuit, a feedback sampling and switch tube controlling circuit and a switch tube crest voltage suppression circuit. The output side of the input rectification filter circuit is connected with the isolation transformer, the output side of the isolation transformer is connected with the output filter circuit and the feedback sampling and switch tube controlling circuit respectively, the switch tube crest voltage suppression circuit is connected with the output side of the feedback sampling and switch tube controlling circuit, the output side of the switch tube crest voltage suppression circuit is connected to the input side of the isolation transformer, and the output side of the output filter circuit is connected with an LED load. The mining isolation type intrinsic safety LED driving power source is characterized in that a passive PFC circuit is additionally arranged between the input rectification filter circuit and the isolation transformer, and a dual-output overvoltage and overcurrent protection circuit is additionally arranged between the output filter circuit and the LED load.

The invention discloses a stretch forming-electromagnetism composite forming device and method for a multi-curvature skin piece. The stretch forming-electromagnetism composite forming device comprisesa bottom plate, a mold and an electromagnetic coil used for forming a plate on the mold, the mold is mounted on the bottom plate, and the electromagnetic coil is arranged above the mold. The stretchforming-electromagnetism composite forming device is characterized in that the stretch forming-electromagnetism composite forming device further comprises a vertical oil cylinder, a tangential oil cylinder, and a chuck used for clamping the edge of the plate, one end of the tangential oil cylinder used for tangentially stretching the plate is hinged to the bottom plate, and the other end of the tangential oil cylinder used for tangentially stretching the plate is hinged to the chuck. A stretch forming and discharging composite process is adopted, stretch forming is conducted to solve a certainspringback problem, then remaining springback is eliminated through electromagnetic force, in this way, the thickness reduction of the plate can meet the design requirement, and meanwhile the requirement for electromagnetic forming energy can also be greatly lowered.

The invention relates to an energy balanced control method and device for an energy-storage power supply system and a balanced system. The method comprises the following steps: during charging balanced control, acquiring actually stored electric energy of each energy storage module, and finding the minimal electric energy; calculating an error value between each of the other electric energy and the minimal electric energy, and judging the amplitude of each of the error values and a first set balanced threshold value, wherein for each of the error values exceeding the first set balanced threshold value, corresponding energy storage branches are controlled to perform charging according to corresponding PWM (Pulse-Width Modulation) control pulses; and during discharging balanced control, finding the maximal electric energy, and calculating an error value between the maximal electric energy and each of the other actual electric energy, wherein for each of the error values exceeding a second set balanced threshold value, corresponding energy storage branches are controlled to perform discharging according to the corresponding PWM control pulses. In the previous two situations, duty ratios of the PWM control pulses are in reverse proportion to the error values. Corresponding charging and discharging energy distribution is performed according to the energy state of each energy storagemodule, so that energy balanced control is realized.

An electrode wire used for spark cutting of low-speed wire cutting comprises an electrode wire body. The electrode wire body is composed of a core material and a surface metal layer, wherein the core material is made of an alloying brass material, and the surface metal layer covers the core material. A transition layer is arranged between the core material and the surface metal layer. The alloying brass material is composed of, by weight, 58.0-65.0% of copper and the balance zinc, a small quantity of adding elements and inevitable impurities. The surface metal layer is composed of copper, zinc, adding elements and inevitable impurities, wherein the zinc content is larger than 52 wt% and smaller than 68 wt%, and the surface metal layer is distributed in a fracture shape longitudinally. Compared with the prior art, the electrode wire has the advantages that the manufactured electrode wire is stable in discharge performance, the cutting speed is increased, a wire feeding part and a guiding device of low-speed wire cutting equipment are prevented from being damaged, a machining technique of the electrode wire is simple, the application range is wide, the cost is low, and broad market prospects are achieved.

The invention relates to a distributed capacitance isolator of an electrostatic adsorption device of an air purifier. The isolator comprises a box body, a PCB (Printed circuit board), a control circuit, a pouring sealant and a plurality of pin terminals. The distributed capacitance isolator has the beneficial effects that in capacitive circuits connected in parallel, a resistor and a high-voltage silicon rectifier stacks are connected in series in each capacitive circuit, so that electrical charges stored at the other capacitors do not be concentrated so as to be discharged at a place in which a capacitor discharges due to short circuit, and therefore the distributed capacitance isolator plays a role in isolating and discharging; the discharge energy is decreased greatly, when particles enter into an electrical field and positive and negative pole pieces are short-circuited, by virtue of decreasing the discharge energetic, an electric spark is weakened, noises and electromagnetic radiation are decreased during sparking, so that the generation of ozone is decreased.

A fuse element (10) and a method for manufacturing the same, are provided whereby the fuse element (10) consists of an active response part which is advantageously formed by at least four metal sub-strips (9) of an elongated fuse metal foil with at least respectively two metal sub-strips being parallel being provided by at least two elongated recess within one or two self-supporting elongated fuse metal strips, with the at least two recesses being provides in serial alignment along the respective fuse metal strip, including leading and trailing parts for electrical connection of each fuse element (10), the elongated fuse metal foil can be reinforced by an elongated dielectric base layer made of polymer material. Accordingly, performance of such a fuse element (10) can be increased and manufacturing costs can be decreased. The invention especially can be applied to a plurality of capacitor sub-units being integrated in housings and submerged in a cooling and insulating liquid within the housing.

The present invention relates to an electric discharge machining apparatus. A voltage measurement circuit (4) is connected between an electrode and a workpiece by a parallel cable through a resistor (R) to measure a machining gap voltage. The parallel cable, like a television antenna feeder line, is formed such that two conductive wires are parallel fixed by an insulating and flexible material such as rubber or resin with a predetermined distance. The interline distance of the parallel cable is increased to decrease a stray capacitance of the cable, so that a high-frequency voltage in finish machining can be measured by the voltage measurement circuit without being attenuated. The resistor (R) is connected to suppress oscillation of a voltage input to the voltage measurement circuit.

The invention discloses a method and a device for improving the performance of an intrinsic safety switching power supply in an explosive dangerous environment. By adoption of the method for detecting the change rate of a current by an inductor, a main circuit is cut off; the time of the current change during short circuit is delayed by the inductor to make the current start rising after a voltage is reduced to zero, so discharging energy during the occurrence of a fault is reduced; and the change rate of the current during the short circuit is controlled by the inductor, so the influence of electromagnetic interference (EMI) is reduced. A current differential measurer of the device is connected with an input end of a driving circuit; an output end of the driving circuit is connected with control ends of switches; the first switch is connected in series with a current-limiting inductor; the second switch is grounded by a load resistor (RL); the current-limiting inductor is connected in parallel with a diode; and the current-limiting inductor and the diode which are connected in parallel are grounded by the RL. The invention has the advantages that: the power of the intrinsic safety switching power supply is improved; the safety and reliability of an intrinsic safety system are improved; the change rate of the current is reduced; and the EMI is reduced.

The invention discloses a pulse power supply energy transmission circuit in reciprocating wire EDM wire cutting, comprising a pulse power supply, an upper conductive block, a lower conductive block, an electrode wire, a workpiece and a host computer. The negative electrode of the pulse power supply is connected to the upper conductive block. A first relay is added between the blocks, a second relay is added between the negative electrode of the pulse power supply and the lower conductive block, the upper conductive block and the lower conductive block are respectively connected to the electrode wire, the positive electrode of the pulse power supply is directly connected to the workpiece, and the host computer By controlling the first relay and the second relay, the upper conductive block, the lower conductive block and the corresponding electrode wire are added to the circuit alternately. The invention solves the problems of equalizing the energy of the discharge points on the surface of the workpiece, equalizing the material removal amount, and the like, and relieves the problem of the waist drum degree error in the middle part.

The invention discloses a micro electric spark pulse power supply based on Boost and RC circuits. The micro electric spark pulse power supply is characterized by comprising a main power loop, a driving circuit, an auxiliary direct-current voltage source and an FPGA controller, wherein the main power loop comprises a boost charging circuit and a discharging loop, and the boost charging circuit adopts a Boost circuit and is used for adjusting the voltage provided by the auxiliary direct-current voltage source and charging the discharging loop, and the discharge loop adopts an RC circuit for providing the breakdown voltage and the discharge energy after breakdown for a gap; the auxiliary direct-current voltage source is used for supplying power to the main power loop and the driving circuit,the FPGA controller is used for outputting a PWM control signal to the driving circuit according to a given target parameter, and the driving circuit performs digital isolation and amplification on the PWM control signal, and generates a driving signal to drive a switching tube in the main power loop to be switched on and switched off. According to the present invention, the charging voltage controllability and the energy adjusting precision are improved, and the machining precision and the machining quality are improved.

The invention discloses an automobile power supply management method, which comprises the following steps: detecting the residual electric quantity and the electric quantity detection deviation of a low-voltage storage battery, the electric quantity detection deviation representing the deviation state of the residual electric quantity detection result under the current working environment; the residual electric quantity and the electric quantity detection deviation of the low-voltage storage battery are sent to a controller; the controller opens or closes the power management module according to the residual electric quantity of the low-voltage storage battery and the electric quantity detection deviation. According to the automobile power supply management method provided by the invention, the residual electric quantity and the electric quantity detection deviation of the storage battery are detected, and according to different detection results, the discharge energy of the storage battery in a low-electric-quantity state is reduced through energy reminding, load reduction or load turn-off limitation, so that the storage battery is ensured to have sufficient electric quantity for starting the automobile; the electric quantity state of the vehicle can be remotely monitored in real time; when the vehicle is in a static state, the whole vehicle power supply is subjected to hierarchical management, and the vehicle power supply condition is remotely monitored.

The invention discloses a low-ozone device of an electrostatic air purifier. The low-ozone device comprises a capacitive isolator, an electrostatic adsorption structure, a tungsten filament, an electric field upper cover, an electric field lower cover and an electrode plate pressing strip. The low-ozone device of the electrostatic air purifier has the beneficial effects that the distance between terminals for fixing the tungsten filament is 124-135mm; optimal fixing points of the tungsten filament of an electrode are polarized through an electrostatic field, so that the resonance effect of the tungsten filament is greatly weakened, reduction of the charge energy of particles entering the electrostatic field is promoted, and generation of ozone is effectively reduced; the distance between a negative plate of the electric field and the tungsten filament is 6mm, and the one-time purification effect is optimal; the width of the negative plate of the electric field is 80.1-80.2mm, the width of a positive plate of the electric field is 58.7-58.8mm. Compared with the conventional negative plate of the electric field, the positive plate of the electric field and the negative plate of the electric field are widened by 30 percent, equivalent particles are removed, and the positive plate of the electric field and the negative plate of the electric field are shortened by 45 percent, so that the amount of the ozone generated by removal of the equivalent particles is obviously decreased.

The invention discloses an ignition circuit. The device comprises a control module, a switching circuit and at least one transformer, wherein a control signal output end of the control module is connected with a control end of the switching circuit, the control module outputs a control signal to the switching circuit to control the conduction state of the switching circuit, and the switching circuit is connected between a primary winding of the transformer and a direct-current power supply. According to the ignition circuit, the switching circuit is used for controlling the conduction state ofthe primary winding of the transformer and the direct-current power supply; the switching circuit is switched on and off according to control frequency output by the control module; the primary winding of the transformer is switched to be in the conduction state with the power supply according to the same frequency, the secondary winding of the transformer correspondingly outputs a high-voltage signal according to the frequency for discharge ignition, the ignition frequency is improved by increasing the on-off frequency of the switching circuit, the single discharge energy is reduced, the ignition noise can be reduced, and the use experience of a user is improved.

A mining isolated type intrinsic safety LED driving power source comprises an input rectification filter circuit, an isolation transformer, an output filter circuit, a feedback sampling and switch tube controlling circuit and a switch tube crest voltage suppression circuit. The output side of the input rectification filter circuit is connected with the isolation transformer, the output side of the isolation transformer is connected with the output filter circuit and the feedback sampling and switch tube controlling circuit respectively, the switch tube crest voltage suppression circuit is connected with the output side of the feedback sampling and switch tube controlling circuit, the output side of the switch tube crest voltage suppression circuit is connected to the input side of the isolation transformer, and the output side of the output filter circuit is connected with an LED load. The mining isolation type intrinsic safety LED driving power source is characterized in that a passive PFC circuit is additionally arranged between the input rectification filter circuit and the isolation transformer, and a dual-output overvoltage and overcurrent protection circuit is additionally arranged between the output filter circuit and the LED load.

The invention is suitable for fine precision machining of insulated hard and brittle materials, belongs to the non-traditional machining field in manufacturing technologies, and particularly provides a pneumatic compression electrochemical discharge machining device and method. An airtight working cavity is filled with helium through a gas supply system, and thus pressure inside the working cavity is increased and controlled. An air pressure feedback and gas supply system is established to regulate the pressure inside the working cavity. A force feedback and tool electrode movement system is established to control effective feeding of tool electrodes, and the machining clearance is guaranteed. Pressure increase can accelerate formation of a gas film layer and improve the stability of the gas film layer, and electro-discharge machining precision and surface machining quality are improved. Pressure increase can also make operating fluid permeate into the machining area more easily, so that the machining depth is increased. Pressure control can indirectly control thickness of the gas film layer, and therefore the electro-discharge machining radius and machining precision can be controlled.

The invention provides a method and a device for realizing powder pressing through a radial electrometric force and an axial electromagnetic force. Powder is pressed simultaneously or in a staged modethrough the radial electromagnetic force and the axial electromagnetic force, the radial electromagnetic force is realized by adopting a solenoid coil, a pulse current is fed into the solenoid coil,a pulse large current and a pulse electromagnetic force are generated on metal powder in an induction mode, sintering is realized through the heat effect generated by the pulse large current, and themagnitude of the pulse electromagnetic force is changed, so that the metal powder can alternately generate elastic deformation and elastic recovery, oxide between the powder is broken, the friction force is reduced, and finally the compaction density is improved. The pulse large current can generate a thermal effect, so that the metal powder and the oxide are melted, the sintering is realized, andthe density of a pressed part is further improved.

A method of manufacturing an ink jet head having a substrate that has a plurality of energy generating elements used for generating energy that in turn is used to discharge ink. The substrate has recessed portions separating the energy generating elements, and a wall member is provided having depending flow passage walls which are joined respectively to the recessed portions. The energy generating elements act on the ink and discharge it through the flow passages.

The invention relates to a capacitance voltage-sharing system for main insulation of an impregnated fiber sleeve, which belongs to the technical field of insulating sleeves and comprises an air side part and an oil side part fixedly connected with one end of the air side part. The air side part comprises an end connecting assembly, a first core body fixedly connected with one end of the end connecting assembly, an insulating piece arranged on the first core body in a sleeving mode and a core body connecting piece arranged at the end, away from the end connecting assembly, of the first core body. The oil side part comprises a second core body with one end fixedly connected with the first core body and a voltage equalizing piece arranged at the end, away from the first core body, of the second core body, and insulating coatings are arranged on the outer surfaces of the first core body and the second core body. According to the invention, the insulating layer in the insulating sleeve is not easy to explode after being broken down, so that the fault probability of the insulating sleeve is reduced.

The invention discloses a stretch-electromagnetic composite forming device and method for multi-curvature skin parts, including a bottom plate, a mold and an electromagnetic coil for forming a sheet on the mold, and the mold is installed on the bottom plate Above, the electromagnetic coil is arranged above the mold, and it is characterized in that it also includes a vertical oil cylinder, a tangential oil cylinder, and a chuck for clamping the edge of the sheet material, and is used for tangentially stretching the sheet material One end of the tangential oil cylinder is hinged to the bottom plate, and the other end is hinged to the chuck. One end of the vertical oil cylinder for vertically stretching the sheet is hinged to the bottom plate, and the other end is hinged to the chuck. hinged. The present invention adopts the composite process of stretching + discharge, and stretching has overcome a certain springback problem, and then eliminates the remaining springback through electromagnetic force, so that the thinning of the sheet can meet the design requirements, and at the same time can greatly reduce the impact on the Electromagnetic forming energy requirements.

The invention discloses a pulse power supply energy transmission loop in reciprocating feed wire cut electrical discharge machining, which comprises a pulse power supply, an upper conducting block, alower conducting block, electrode wires, a workpiece and an upper computer. A first relay is additionally arranged between the negative electrode of the pulse power supply and the upper conducting block; a second relay is additionally arranged between the negative electrode of the pulse power supply and the lower conducting block; the upper conducting block and the lower conducting block are respectively connected with the electrode wires; the positive electrode of the pulse power supply is directly connected with the workpiece; and the upper computer enables the upper conducting block, the lower conducting block and the corresponding electrode wires to be alternately added into a circuit by controlling the first relay and the second relay. According to the pulse power supply energy transmission loop in reciprocating feed wire cut electrical discharge machining provided by the invention, the problems of energy balance and material removal amount balance of discharge points on the surface of the workpiece are solved, and the problem of middle waist bulging degree errors is relieved.