38results about How to "Reduce the number of breaks" patented technology

The invention relates to a grid-connected inverter and a control method thereof. The grid-connected inverter comprises a master control unit as well as a DC-side power supply, a DC-side switch, a busbar capacitor assembly, an inverter unit, a filter unit and a circuit breaker which are connected in sequence; the filter unit at least comprises a filter capacitor and a switch element connected with the filter capacitor in series; when the detected DC voltage reaches startup voltage, the master control unit sends a PWM (Pulse Width Modulation) wave to start the inverter unit to power on the switch element, and when the output voltage of the filter unit reaches the power grid voltage, the master control unit controls the circuit breaker to be powered on; and the master control unit also controls the inverter unit to stop inversion and power off the switch element when the detected DC voltage is lower than the startup voltage. According to the invention, because the switch element is additionally arranged on a branch of the filter capacitor of the filter unit, the grid-connected inverter is freely controlled not to absorb reactive power from a power grid under the circuit breaker is not powered off, so that the breaking frequency of the circuit breaker is reduced, the system efficiency is improved and the complete machine cost is reduced.

The invention belongs to the technical field of smelting, and particularly relates to a smelting process of steel for boron-containing prestressed steel wires and steel strands. The process comprises the following steps: preparing molten iron, waste steel and raw iron serving as raw materials; during smelting of a revolving furnace, adding slag charge, performing the operation of raising high carbon content and post blowing, controlling the end point C over 0.4 percent, and controlling the end point P below 0.015 percent; during steel tapping of the revolving furnace, adding silicon carbide, lime and an alloy serving as deoxidizing materials in sequence along with the steel flow; during refining, deoxidizing the top of the slag by adopting the silicon carbide, wherein the target refining final alkalinity is 1.7; after refining, performing soft argon blowing at the bottom of a steel ladle; during continuous casting, feeding Xibao special high-carbon steel protection slag to a crystallizer; and electromagnetically stirring the crystallizer, casting at a low superheat degree, performing forced cooling during secondary cooling, and electromagnetically stirring at the tail end. By adopting the smelted steel for the boron-containing prestressed steel wires and the steel strands, qualification of chemical components can be ensured. During pulling and twisting of parent metal, the fracture times due to generic defects, sundries and carbon segregation on the surface of a casting blank can be reduced effectively.

The invention discloses an enhanced stable routing protocol for the vehicle Ad Hoc network. A source node finds a target node and obtains multiple effective routes to the target node; and in the route selection phase, a mechanism of the longest route effective time is introduced to select a route longest in effective time and more stable in performance for data transmission. In the route maintenance phase, if the main route is in failure, the source node directly uses the multipath standby route to repair the route, and the route repairing efficiency is improved. The enhanced stable routing protocol can improve the delivery rate of data packets, reduce the average end-to-end time delay, reduce the routing cost, and improve the performance of the vehicle Ad Hoc network.

The invention provides a production line for harmless treatment and efficient resource recovery for waste refrigerators. According to the production line, a first crushing device is connected to a second crushing device through a conveying device; the conveying device between the first crushing device and the second crushing device is provided with an iron removal device; the second crushing device is connected to a distributor; a discharge port at the bottom of the distributor is connected to a metal sorting device; and at least one foam suction device is further arranged between the first crushing device and the metal sorting device and is connected to a foam compressor. The production line has the advantages that the efficiency of the harmless treatment and efficient resource recovery for the waste refrigerators can be improved through reasonable equipment selection and arrangement, the crushing efficiency can be improved, the crushing frequency of polyurethane foam can be reduced, and the risk of fire combustion of polyurethane foam can be reduced.

The invention provides a paper box sucking frame component for a box filling machine. The paper box sucking frame component comprises a paper box conveying channel for holding paper boxes, wherein the tail end of the paper box conveying channel is further pivoted with a sucking frame; the rotating shaft of the sucking frame is parallel to the lower edge of each paper box on the paper box conveying channel; the sucking frame rotates between a paper box support rack and a paper box conveyer belt under the driving of at least one frame driving cylinder; a middle space through which the paper boxes penetrate is formed in the middle of the sucking frame; one or more air sucking arms are also arranged on the sucking frame; the air sucking arms rotate under the control of an air sucking arm control system. By adopting the paper box sucking frame component for the box filling machine, two sides of the sucking frame are uniformly stressed, the sucking frame is prevented from deformation, the falling smoothness of the paper boxes is improved, the times that the air sucking arm is damaged are reduced, and moreover the time for recovering faults is shortened.

The invention relates to a coating method for the mounting ring (17) of a plucker roller (1) of synthetic fiber materials, which applies at least two layers on the mounting ring (17, 30) via chemical coating. The method comprises steps of: applying a first coating of a nonferrous metal as a base coating on the mounting ring (17, 30); and applying a coating based on a nickel-phosphorus alloy, which does not contain any hardener material as the other layer; then the coated mounting ring (17, 30) is then subjected to heat treatment at a temperature which is below the tempering temperature of the base material of the ring.

The invention discloses an oil pumping technology based on a javelin valve anti-gas pump. The oil pumping technology based on the javelin valve anti-gas pump includes that in an upstroke, an oil pumping rod drives a center rod to move upwards, a javelin valve is closed, a plunger is driven to move upwards, oil liquid on the upper portion of the plunger is lifted to the ground, and meanwhile, the plunger lower portion space becomes large, pressure is reduced, and oil is filled in a pump; and in a down stroke, the oil pumping rod drives the center rod to move, pushes the plunger to descend, and enables the javelin valve to be forcibly opened simultaneously, gas-oil mixtures in a pump lower cavity can smoothly enter an oil tube through the plunger, and therefore the anti-gas effect is achieved. The mechanical opening and closing is driven by the oil pumping rod, and the practice that a delivery valve of a conventional pump is opened and closed through a liquid pressure in the pump is abandoned; the oil pumping rod is in floating connection with the plunger, the oil pumping rod and the plunger can rotate relative to each other, and therefore the deformation factors and the number of breaking disconnection times of the oil pumping rod are reduced; and the javelin valve is opened and closed always through one face when working, and the structure determines that the javelin valve is short in service life.

The invention relates to a plunger (1) of a filling tool according to EP 1 088 495 A1 for inserting a strip-shaped holding element, preferably an anchor, into a bristle hole of a brush head capable of receiving bristle tufts . The push rod (1) has on the end side an embedding surface (2) for engaging the retaining element, its cross-section (3, 4, 15; 3, 5, 8; 3) is defined by the longitudinal face and the end face (6, 7; 6, 8; 6, 10) limited. The push rod (1) has an end region (17, 20, 21) on the end side, which is pierced into the material of the brush head when the retaining element is inserted. According to the invention, the cross-sectional area ( 24 , 25 , 26 ) of the push rod ( 1 ), which enters the bristle opening and lies outside the end area, is wider than the end-side end area ( 17 ).

The invention provides a pin pressing device for a commutator, belongs to the technical field of commutator equipment and solve the problem of poor extrusion effect of an existing pin pressing device for the commutator. The pin pressing device for the commutator comprises a base body, a lower mould which is arranged on the base body and is used for mounting the commutator and an upper mould which is matched with the lower mould; the upper mould comprises a pressing cylinder and a connecting shaft; the lower mould comprises a mould core and a plurality of mould plates which uniformly encircle the periphery of the mould core; a gap is formed among the mould plates; when the commutator is arranged on the lower mould, hook pins of the commutator are clamped in the gap, and the upper mould moves downwards to enable the mould plates to be close to the mould core in a radial direction and to extrude the hook pins to be in a boss shape. The pin pressing device for the commutator has the advantages of good extrusion effect and capability of preventing the hook pins of the commutator from being broken.

The invention provides a preparation method of a fusion protein inclusion body, which comprises the following steps of: crushing engineering bacteria; washing an inclusion body; and denaturing, dissolving and filtering the inclusion body. According to the invention, a prepared inclusion body denatured dissolved solution is obviously enhanced in clarity, and a filter is obviously increased in filtering capacity.

The invention provides a high-temperature alloy wire straightening and shearing device, belonging to the field of special alloys. The high-temperature alloy wire straightening and shearing device comprises: a hot straightening furnace, wherein a heating area, a heat preservation area, a shaping area and a cooling area are sequentially arranged in the hot straightening furnace in an alloy wire entering direction; a first interlayer cooling pipeline, which is arranged in the hot straightening furnace and penetrates through the heating area, the heat preservation area and the shaping area, wherein the interlayer of the first interlayer cooling pipeline is filled with argon; a second interlayer cooling pipeline, which is arranged in the hot straightening furnace and penetrates through the cooling area, wherein the interlayer of the second interlayer cooling pipeline is filled with a liquid cooling medium; a shaping mold, which is arranged at the outlet of the shaping area, wherein two ends of the shaping mold respectively communicate with the outlet of the first interlayer cooling pipeline and the inlet of the second interlayer cooling pipeline; and cutting equipment, which is arranged on one side of an outlet of the second interlayer cooling pipeline and is used for receiving the alloy wire discharged from the second interlayer cooling pipeline and cutting the alloy wire. According to the device, a technological process is simple, labor cost is saved, environmental pollution is reduced, and production efficiency is improved.

An embodiment of the invention provides a combined converter and a control method thereof. The combined converter comprises a frame circuit breaker and at least two converters, wherein each convertercomprises an AC grid side, a DC side, an AC motor side, a first contactor and a second contactor. According to the combined converter, through controlling the on-off state of the first contactor, thesecond contactor and the third contactor, the accessing state of each converter is individually controlled, and system redundancy is improved. Furthermore the frame circuit breaker can be always in anoff state, thereby reducing the number of on-off times of the frame circuit breaker and furthermore prolonging service life of the frame circuit breaker. Furthermore, because the converters of a plurality of accessing systems are parallelly connected through the third contactor, circulating current among the converters is lowered.

The invention discloses Pu'er tea dry rice noodles and a preparation method thereof. The preparation method comprises the following steps: elutriating, soaking, crushing and grinding raw material riceto obtain rice slurry; mixing 80-90 parts by weight of the rice slurry, 0.15-1 part by weight of a Pu'er tea raw material and 20-25 parts by weight of starch, and performing extrusion forming to formfresh rice noodles with a cross section diameter of 3-2mm; and sequentially performing cooling and drying shaping on the fresh rice noodles to obtain the Pu'er tea dry rice noodles. The Pu'er tea rawmaterial is ultramicro tea powder with an average particle size of 25-50 microns. The dry rice noodles are rich in taste, the original dried rice noodles are single in taste, and the Pu'er tea tasteof the rice noodles is improved through an existing processing technology.

The invention discloses a novel cutter device and a manufacturing method thereof. The cutter device comprises a cutter and a cutter head; the cutter is molded by integrally pressing a rectangular steel plate on a pressing mould and is provided with a base plate and a cutting edge side plate between which a certain included angle is formed; a cutting edge is formed on the cutting edge side plate; the cutter head includes an inner cutter head and an outer cutter head which are fixed together; and the cutter is fixedly connected with the cutter head to form the cutter device. The cutter provided by the invention is simple to machine and manufacture and has low cost. By adopting the novel cutter device, the service life of the cutter of an expansion dryer is prolonged, the particle-cutting effect is obviously improved, the vibration of the device and the weights of the cutter and the cutter head are reduced, and it is convenient for overhaul and maintenance.

The invention discloses low-loss and convenient noodle cutting equipment, which comprises a bottom plate. The upper surface of the bottom plate is fixedly connected with air cylinders, the side facesof the air cylinders are fixedly connected with supporting plates, transmission shafts are mounted at the axes of the supporting plates in a sleeving mode, rotating wheels are mounted outside the transmission shafts in a sleeving mode, steel wires are mounted outside the rotating wheels in a sleeving mode, the upper sides of the left side faces of the air cylinders are fixedly connected with firstconnecting rods, the ends, away from the air cylinders, of the first connecting rods are fixedly connected with sliding rods, sliding grooves are formed in the surfaces, away from the first connecting rods, of the sliding rods, bolts are inserted in the sliding grooves and extend into the sliding rods, and spacers are mounted on the surfaces, extending into the sliding rods, of the bolts in a sleeving mode. According to the low-loss and convenient noodle cutting equipment, by arranging the steel wires, traditional blade cutting is replaced, the weighing force of a cut object can be well reduced, the fracture number of noodles is decreased, and the purpose of reducing the loss is achieved.