40results about How to "Ensure normal working life" patented technology

The invention relates to a shift register and a grid driver set of a liquid crystal display. The shift register comprises a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a first pull-down thin film transistor, a second pull-down thin film transistor, a first pull-down thin film transistor drive unit and a second pull-down thin film transistor drive unit, wherein the first pull-down thin film transistor drive unit is used for controlling the first pull-down thin film transistor to open when a signal output end outputs a low level and a first clock signal input end inputs a high level; and the second pull-down thin film transistor drive unit is used for controlling the second pull-down thin film transistor to open when the signal output end outputs a low level and a second clock signal input end inputs a high level. The shift register and the grid drive set of a liquid crystal display can effectively restrain output noise and can ensure that the shift register and each thin film transistor in the grid drive set can not generate great threshold voltage excursion, thereby ensuring the normal service life of the shift register and the grid drive set.

The invention provides a heat dissipation performance test system. A power supply unit is in circuit connected with a heating device to form a loop, the heating device is arranged on the tested water-cooling heat sink, a water supply unit is in waterway connection with the tested water-cooling heat sink to form another loop, and a control unit controls switches of the power supply unit and the water supply unit respectively through an industrial personal computer. In the waterway loop of the water supply unit and the tested water-cooling heat sink, a pipeline of a water inlet end of the tested water-cooling heat sink is provided with a flow controller, a pressure sensor and a temperature sensor. A pipeline of a water outlet end of the tested water-cooling heat sink is provided with the temperature sensors. The water inlet end and the water outlet end of the tested water-cooling heat sink are in parallel connection with a bypass which is provided with a differential pressure sensor. Compared with the prior art, the heat dissipation performance test system and method are capable of rapidly and accurately measuring heat dissipation performance of the tested water-cooling heat sink.

The invention relates to a method and a device which are used for leading a long wind pipe to uniformly send and return the wind. The proportional cross-section area size of the rated shunt air quantity of each step of bypass branch pipes is calculated according to the quantity of the three-way wind valves arranged on the long wind pipe and the cross-section area size of the total wind pipe of the initial three-way wind valve; furthermore, the proportional cross-section area size is taken as the basis of the shunting of the wind quantity shunt valve with the shunt adjusting function and the gradual contraction quantity of the cross-section area size of all levels of valves; therefore, leading the wind speed and the dynamic pressure in the long wind pipe to trend to be consistent and the wind-obtaining quantity of all bypass branch pipes to trend to be close, and achieving the object of uniformly sending and returning the wind by the long wind pipe. The device consists of a long wind pipe and bypass branch pipes; the long wind pipe is connected by a plurality of wind quantity shunt three-way adjusting valves or modified three-way wind valves which have the function of shunt adjustment, ensure the airflow speed and the dynamic pressure in the long wind pipe to be approximate to each other and lead all bypass branch pipes to obtain the basically approximate airflow wind quantity. The method is reliable, the device has scientific and reasonable structure, the difficult problem that the existing long wind pipe can not realize the uniform sending and returning of the wind for a long time is solved, and the method and the device have extremely strong practicability.

It discloses a high-speed reciprocating color 3D printer; said printer includes a nozzle assembly that is horizontally movable in one direction, preferably an X-axis direction, and a workbench that is vertically movable in the Z-axis direction. A plurality of spray pipes are mounted on the nozzle assembly, wherein, the spray pipes contains a variety of liquid printing materials, including white matrix material and a variety of color materials. In a movement process, each spray pipe works separately. The white matrix material is used to print out the image firstly, especially the darker area of the image, and then the color of the image is printed through the color material, and the resulting image partially protrudes outward.

The invention provides a safety running control method for a grid-connected current transformer under a power grid fault. The method comprises the following steps of s1, determining a parameter limitation value for safety running of the grid-connected current transformer, wherein the parameter limitation value comprises an active power fluctuation margin limitation value and a phase current limitation value; s2, setting an active power reference value and a reactive power reference value containing a positive-sequence component and a negative-sequence component under a rotating coordinate system, allocating the positive-sequence components and the negative-sequence components of active power and reactive power according to the parameter limitation value, and outputting the active power reference value and the reactive power reference value after allocating; and s3, calculating an output current reference value of the grid-connected current transformer according to the allocated active power reference value and the reactive power reference value containing the positive-sequence component and the negative-sequence component under the rotating coordinate system, and controlling the grid-connected current transformer to output current according to the current reference value. Through the above method, factors such as phase current and power fluctuation are comprehensively considered, the reference current is accurately output and controlled, the safety running of the grid-connected current transformer under the power grid fault can be effectively ensured, the normal working and the service lifetime of the grid-connected current transformer are guaranteed, and an effective support can be formed for a power grid.

The invention discloses a low-cost intelligent chip carrier band and a manufacturing method therefor, and belongs to the technical field of intelligent chip packaging. The low-cost intelligent chip carrier band comprises a carrier band base material (5); a surface conductive layer is formed on the upper surface of the carrier band base material (5); the surface conductive layer is divided into multiple contact blocks at intervals by insulating trenches (4); the surface metal layer comprises a bottom metal layer and a contact metal layer arranged on the upper surface of the bottom metal layer; the low-cost intelligent chip carrier band is characterized in that welding holes (10) corresponding to the contact blocks are formed in the lower surface of the carrier band base material (5); an intra-hole metal layer fitted with the surface conductive layer is formed in the welding holes (10); a cavity hole (8) is formed in the middle part of the carrier band base material (5); and an insulating layer is arranged on the upper surface of the cavity hole (8). According to the low-cost intelligent chip carrier band and the manufacturing method therefor, the intra-hole metal layer is not formed in the cavity hole for fixing chips, so that the cost is greatly lowered.

The invention discloses an electromagnetic lock for a cleaning machine. The electromagnetic lock includes an electromagnetic lock body and a lock rod which can stretch and retract relating to the electromagnetic lock, and also including a positioning member arranged on one side of the electromagnetic lock body and tightly fit with the electromagnetic lock body, and a first leather cup and a second leather cup for sealing, wherein a cavity with two open ends is formed in the positioning member; the lock rod passes through the positioning member; two ends of the first leather cup are respectively fixed with the periphery of the first end, away from the electromagnetic lock body, of each of the lock rod and the cavity, and seal the first ends; two ends of the second leather cup are respectively fixed with the periphery of the second end, close to the electromagnetic lock body, of each of the lock rod and the cavity, and seal the second ends. Through the arrangement of the two leather cups, the effect of dual sealing is provided, water and steam can be effectively blocked at the outer side of the electromagnetic lock body, in addition, residues after cleaning and dirt also can be blocked at the outer side of the electromagnetic lock body, and thereby the normal work and service life of the electromagnetic lock are ensured.

The invention provides a grid-connected inverter control method and system based on power grid asymmetry fault. The grid-connected inverter control method is used for controlling a grid-connected inverter connected between a new energy module and a power grid and comprises the steps that parameter limiting values of new energy for safely transmitting the electric quantity to the power grid throughthe grid-connected inverter is determined and comprises the active power fluctuation amplitude limiting value and the maximum-phase current limiting value; the proportion of the active power output upper limit value and the positive sequence active power of the grid-connected inverter during the fault is obtained through the parameter limiting values according to the fault type and the dropping degree; PI adjusting is conducted on the direct current bus voltage of the grid-connected inverter and reference values of the direct current bus voltage to obtain active power reference; output current reference values of the grid-connected inverter are determined according to the proportion of the active power reference and the positive sequence active power; and the grid-connected inverter is driven to output the current according to the current reference values. According to the grid-connected inverter control method and system based on the power grid asymmetry fault, it can be ensured thatthe grid-connected inverter operates safely under the situation of the asymmetry fault of the power grid, and normal work and the service life of the grid-connected inverter are ensured.

The invention relates to a material cooling conveyor with steel belt surface cleaning and protection functions. The material cooling conveyor is characterized in that a steel belt surface cleaning mechanism and a steel belt protective release agent application mechanism are fixedly arranged on a return path of the steel belt circulating work in sequence, wherein the steel belt surface cleaning mechanism mainly includes a left/right tool rest limiting supporting seat, a tool rest, a scraper and a slag receiving box, and the steel belt protective release agent application mechanism mainly includes a left/right push-pull rod lifting mechanism, a water tank rubber roller mechanism and a left/right supporting mechanism of a water tank. The steel belt surface cleaning mechanism and the steel belt protective release agent application mechanism work synchronously with the operation of a steel belt, the steel belt protective release agent application mechanism has two working modes of applyingand non-applying of a protective release agent according to actual working conditions on the steel belt, so that the steel belt can be subjected to orderly heat transfer, promoting of the cooling of high-temperature molten materials, curing and evaporating of moisture in the protective release agent after being evenly applied with the protective release agent in a surface clean state, and thus theprotective release agent becomes a surface protective layer that facilitates the scrape-off of granular products and the normal working life of the steel belt.

The invention relates to a sulfur underwater granulation system with a reasonable structure. The sulfur underwater granulation system contains a liquid sulfur tank, a liquid sulfur pumping mechanism,a liquid sulfur granulation and molding mechanism, a granulated sulfur and water separation mechanism, a granulated sulfur air drying mechanism, a sulfur powder remelting mechanism, a product collection mechanism, and a sulfur powder water settling mechanism. The granulating and molding mechanism is arranged in a closed type with a controllable air pressure, which can prevent liquid sulfur and sulfide flue gas from overflowing and ensure safe and efficient production; a flue gas purifier and a dust purifier with sulfur gas separation and powder-gas separation functions are arranged between a liquid sulfur dropping device and a sulfur powder water settling tank and between the granulated sulfur air drying mechanism and the sulfur powder water settling tank respectively, which is beneficialto environmental protection and resource recycling; and a dehydrator with a function of reducing the accompanying grain water output is arranged between a forming water tank and a dehydration vibrating screen, so that the loads of solid-water separation and air drying facilities can be reduced, the service life can be ensured, the shutdown maintenance probability can be reduced, the production cost can be reduced, the dehydration and air drying efficiency of the formed particles can be improved, and the product quality and the high-efficiency output of the system can be ensured. The sulfur underwater granulation system achieves remarkable results and is a major innovation in this field.

The present invention relates to a SiC MOSFET bridge arm crosstalk suppressing drive circuit and control method for changing and shutting off negative voltage. The circuit includes first, second, third and fourth voltage totem pole structure circuits, first and second drive resistor circuits, , two low-impedance loops and upper and lower tubes; the first voltage totem pole structure circuit is connected to the second voltage totem pole structure circuit; the second voltage totem pole structure circuit is connected to the first driving resistance circuit, and the first driving resistance circuit is connected to the upper The first low-impedance loop is connected between the tubes; the third voltage totem pole structure circuit is connected to the fourth voltage totem pole structure circuit; the fourth voltage totem pole structure circuit is connected to the second drive resistance circuit, and the second drive resistance circuit is connected to the lower tube The second low-impedance loop is connected between them; the upper pipe is connected with the lower pipe. The invention can give full play to the performance advantages of the SiC MOSFET high-speed switch, realize the crosstalk suppression function of the bridge arm, and increase the driving voltage at the moment of turning off, realize high-speed switching, and reduce the loss of the switching tube.

The invention provides a comprehensive temperature-control electromagnetic clutch and belongs to the technical field of electromagnetic clutches. The comprehensive temperature-control electromagnetic clutch comprises a cooling assembly and an automatic heat dissipating assembly, wherein the cooling assembly comprises a driving part, a driven part, a temperature-control mechanism and a cooling mechanism; the driving part comprises a belt pulley and an electromagnet; the driven part comprises an armature and a driving shaft; the electromagnet comprises an inner coil and an outer coil; the temperature-control mechanism comprises a first temperature-control switch and a second temperature-control switch; the first temperature-control switch is connected with the outer coil; the second temperature-control switch is connected with the inner coil; the cooling mechanism comprises an air cooling device and a cooling pipe; the air cooling device is connected with the driving shaft; the cooling pipe is arranged in the driving shaft and communicates with the air cooling device; the automatic heat dissipating assembly comprises a heat absorbing device, a heat exhaust pipe arranged above the heat absorbing device, and an air inlet pipe arranged below the heat absorbing device; the heat absorbing device comprises a ring cavity, a plurality of heat absorbing parts arranged on the inner side wall of the ring cavity, and a liquid inlet pipe arranged on one side of the upper part of the ring cavity; and the liquid inlet pipe is equipped with a temperature-control switch. By adoption of the comprehensive temperature-control electromagnetic clutch provided by the invention, other devices can be effectively cooled within a wide range; and meanwhile, the working temperature of the comprehensive temperature-control electromagnetic clutch can be controlled.

LED lamps in the prior art dissipate heat through aluminum alloy materials or plastic-clad aluminum lamp housings, so that the LED lamps have the defects of being high in cost, difficult to recover and not environmentally friendly. An LED lamp in a novel structure scheme comprises a lamp cap, a lamp cap plastic part, an LED light source circuit board assembly and a lampshade, and is characterizedby further comprising a heat dissipation lamp body made of plastic, the heat dissipation lamp body is mainly formed by sealed combination of two plastic parts with different shapes, a sealed cavity isformed between the two plastic parts, heat conducting liquid is injected into the sealed cavity, heat energy generated by LEDs is rapidly conducted to the surfaces of all the positions of the heat dissipation lamp body through heat conduction of the liquid, and then the heat energy is dissipated into environment air; as the shape structural design of the heat dissipation lamp body is also special, the contact surface area of the lamp body and the air is increased to the maximum degree, the heat dissipation area is increased, the heat dissipation performance of the lamp is effectively enhanced, and it is guaranteed that the working life of the lamp meets the design requirements; meanwhile, the lamp is all made of plastic, the cost of the lamp is effectively reduced, waste recovery is facilitated, and obvious social and economic benefits are achieved.

The invention discloses a forward feedback type absorption circuit for improving the efficiency of a direct-current solid-state circuit breaker, and relates to the technical field of power electronics. The circuit comprises a voltage spike absorption circuit, a forward energy storage circuit, a reverse energy storage circuit and an energy feedback circuit, wherein the voltage spike absorption circuit, the forward energy storage circuit and the reverse energy storage circuit are respectively connected in parallel at two ends of a first main power tube and a second main power tube which are connected in series reversely, and the energy feedback circuit is connected in parallel at two ends of a power supply. The first end of the first main power tube and the second end of the second main power tube are respectively connected with two ends of a power supply. One end of the load is connected with the second end of the second main power tube, the other end of the load is connected with the negative electrode of the power supply, the voltage spike absorption circuit is used for absorbing voltage spikes, the forward energy storage circuit and the reverse energy storage circuit are used for storing energy when the load is short-circuited, and the energy feedback circuit is used for feeding back the stored energy to the power supply. The circuit enables energy to be fed back to a power supply while providing a voltage spike absorption function, and improves the efficiency of the DC solid-state circuit breaker.

The invention relates to a novel combustion device with a nozzle slagging prevention function. The novel combustion device comprises an air powder channel, an air powder nozzle which is formed by a middle nozzle and peripheral high-speed air nozzles, and a limiting adhesive tape which is acted by high-temperature resistant thermal insulation cotton. The peripheral high-speed air nozzles are arranged at the periphery of the middle nozzle and are supplied with air by a boiler bellows, so that a high-speed airflow ring with functions of blocking ash and slag in a boiler and avoiding slagging at the middle nozzle can be formed at the periphery of the middle nozzle, smooth supply of air and powder airflow and the combustion stability of the boiler are ensured, and the operation of the boiler isnot restricted by coal types. The heat-resistant thermal insulation cotton which is not prone to slag sticking is adopted to replace a traditional refractory casting material which is prone to slag sticking and caking, so that thermal insulation and the normal working life of the air powder nozzle are ensured, at the same time the slagging phenomenon on the surface near the air powder nozzle is also avoided, the unimpeded channeling of combustion flue gas in the boiler is facilitated, the occurrence probabilities of coking on the boiler wall, and abrasion or corrosion of the heated surface are reduced, the workload and cost of daily shutdown maintenance are reduced, the boiler operation is not restricted by the coal types, and the practicability is very high.

The invention discloses a heat-removing constant-temperature structure for a high-power LED lamp. The structure comprises a flat gas-liquid conversion hollow cavity, wherein LED lamp beads are installed on one side of the gas-liquid conversion hollow cavity, magnetic working media corresponding to the LED lamp beads are arranged on the other side of the gas-liquid conversion hollow cavity, and excitation devices are arranged corresponding to the magnetic working media. During actual working, if the high-power LED lamp is in the overheat working state, excitation demagnetization is conducted on the magnetic working media by means of the excitation devices so that heat removal and refrigeration can be achieved; if the high-power LED lamp is in the polar region or high-altitude ultra-cold working state, intermittent constant-temperature excitation is conducted on the magnetic working media by means of the excitation devices so that constant temperature can be realized.