42results about How to "Long-term normal operation" patented technology

The invention discloses a brushless direct-current electric tool.A stator (10) comprises a stator core (25), stator coils (22), a front skeleton (8), a rear skeleton (12) and a lining (28), winding grooves (27) are formed in the stator core (25), the lining (28) is installed in the winding grooves (27), the front skeleton (8) and the rear skeleton (12) are correspondingly installed in the winding grooves (27) in the two ends of the stator core (25), the stator coils (22) are wound around the front skeleton (8) and the rear skeleton (12) on the winding grooves (27) and the lining (28), notches penetrating through the winding grooves (27) are correspondingly formed in the front skeleton (8), the rear skeleton (12) and the lining (28), an isolation notch wedge (21) is embedded into each notch, and the isolation notch wedges (21), and the front skeleton (8), the rear skeleton (12) and the lining (28) are matched between the adjacent stator coils (22) to form a stator inner ventilating channel (23), wherein an inlet and an outlet of the stator inner ventilating channel (23) are communicated with an air inlet (19) and an air outlet (3) respectively.By the adoption of the structure, the brushless direct-current electric tool has the advantages of being simple and reasonable in structure, convenient to produce and machine and safe and reliable in operation, the stator is good in ventilating and cooling effect, and a rotor is good in dustproof effect.

The invention discloses a SVG secondary power acquisition method. The external 380V power supply is led to the connection terminal of the control cabinet, connected to the input of the UPS through a single-phase circuit breaker, and the output of the UPS is connected to the 220V incoming line of the control box. terminal. At the same time, the output of the UPS is led to the wiring terminals of each power unit through a contactor; and then led to the power supply terminals of the module control board through the isolation transformer. The present invention provides stable 220V control power to the control box through the UPS, has the dual functions of isolation and filtering, and improves the anti-interference ability of power supply; the module power supply provides 220V power supply to the power unit through the isolation transformer and the module control board, and realizes the isolation of high and low voltage , At the same time, the module control board is designed with the function of power failure protection, which has the advantage of reliable power supply.

The invention relates to an automatic sand flushing device, which includes an automatic sand removal plate, a plurality of back flush water pipe sets, a back flush inlet pipe, switch valves, a plurality of spray nozzles, an ultrasonic mud-water interface instrument and an automatic control system. The automatic sand removal plate is fixedly disposed at the bottom of an electrical desalting tank inner wall, the plurality of back flush water pipe sets are disposed in the electrical desalting tank and positioned above the automatic sand removal plate, each back flush water pipe set comprises a plurality of back flush water pipes, and the spray nozzles are all arranged on the back flush water pipes. The back flush inlet pipe is communicated with the back flush water pipes, and the switch valves are arranged in the back flush inlet pipe. The ultrasonic mud-water interface instrument is disposed at the bottom of the electrical desalting tank to detect the thickness of silt deposited in the electrical desalting tank. Also, both the ultrasonic mud-water interface instrument and the switch valves are in signal connection with the automatic control system. When the ultrasonic mud-water interface instrument detects that the electrical desalting tank bottom silt exceeds a threshold thickness, the automatic control system opens the switch valves so as to flush the silt at the electrical desalting tank bottom.

The invention discloses a glass cover extactor hood including a smoke-collecting cavity, a side ventilation inner wall, a side intake air cover, a control box, a fan, a composite filter screen, a filter medium, an oil tray, a glass cover and an oil pump or the like. The glass cover is arranged at the lower end of the smoke-collecting cavity and is fixed. A motor is arranged at an upper part in the smoke-collecting cavity. The lower part of the motor is connected to the fan. The invention is characterized in that a fixed plate is fixed under the smoke-collecting cavity of the glass cover extactor hood, one side intake air cover is respectively fixed on the left side and the right side out of the fixed plate, the side ventilation inner wall is fixed at the middle, the lower end of the side intake air cover is connected to an oil tank, the periphery of the lower end of the side ventilation inner wall is arranged in the oil tank, and the control tank is arranged in front of the side intake air cover. The invention has the advantages of concise and beautiful appearance due to the inner-hidden filter screen and an oil cup, small volume and energy consumption, small noise and easy and convenient unpicking and washing, long service life, high oil and smoke absorption efficiency, and clean and hygienic exhausted air. Two side suction is strong to match the characteristics that stoves are arranged at two sides of kitchen range, so that the oil and smoke is not spilled.

A method for recovering butadiene by selective hydrogenation of alkynes, using the C4 fraction rich in alkynes after extraction of butadiene as a raw material, in the presence of a catalyst, using an adiabatic reactor, selective hydrogenation to obtain 1,3 ‑Butadiene, the operating conditions of the process are as follows: the reaction inlet temperature is 20-60°C, the reaction pressure is 0.6-2.5MPa, and the liquid space velocity is 10-25h ‑1 . The catalyst is a palladium-molybdenum catalyst prepared on a nickel-containing alumina carrier with a specific crystal form, which can greatly improve the dispersion and utilization of active metals, and improve the hydrogenation performance of the catalyst. Adopting the method of the invention has very obvious good effects on the effective utilization of the C4 fraction rich in alkynes after the extraction of butadiene, the reduction of waste of resources and the improvement of economic benefits.

The invention discloses a flood and silt prevention method for a large-scale musical fountain in a natural river basin. Downstream, the convex bank refers to the river bank whose shoreline is convex toward the direction of the river, and the concave bank refers to the river bank whose shoreline is concave toward the direction away from the river; the river bottom of the river area corresponding to the convex bank and the concave bank is riprapped and silted, that is, Lay silting stones; build diversion walls in the river area corresponding to the convex bank, and install floating row for large musical fountains in the river area corresponding to the concave bank, so that the floating row is blocked by the diversion wall in the direction of the river. The present invention remarkably improves the preventive ability in terms of flood control and silt prevention by reforming the river bank and the river bottom and constructing the diversion wall, and protects the large music fountain in the natural river basin to be able to operate normally for a long time.

The invention relates to a novel high-efficiency dedusting and desulphurization integrated system process for a coke-tamping, coaling and coke-discharging ground station, comprising the following steps: smoke gas enters a heat accumulating type cooler to be cooled to below 120 DEG C during coal feeding or coke discharging; the cooled smoke gas enters a multifunctional separator and separated tar and a part of large-particle sparkle dust enter a tar settling tank; the smoke gas processed by the multifunctional separator enters a fire resistance bag type dust remover to be filtered; and clean gas is discharged into the atmosphere after filtration. The novel high-efficiency dedusting and desulphurization integrated system process for the coke-tamping, coaling and coke-discharging ground station thoroughly solves the core problems of flammability, explosion proof, hard elimination of toxic gas and high-sulphur coal desulfurization of hard fire cloth bags, tar paste cloth bags and bag-typedust removers, which plague coking enterprises and dust removal enterprises for many years. Proved by practical tests, the dust removal efficiency is more than 99.7 percent, the discharged dust concentration is less than 40mg / m<3>, dust recycled by the ground station is 1400t / a, and smoke and dust are not generated in the production process of a coke oven, thereby completely meeting environmentalrequirements.

The invention relates to a structure for preventing damage to a sealing ring when a high-speed rotor starts and stops, including a shaft, a bearing and a gear box. inside the cavity; the oil seal ring is fixed at the bottom of the seal installation cavity, the oil seal ring is set on the shaft, and there is a gap between the oil seal ring and the shaft; the seal plate is set outside the oil seal ring, and the seal plate is fixed on the gear box. The plate sleeve is set on the shaft, and the shaft sleeve is set between the inner hole of the sealing plate and the shaft, and the shaft sleeve is connected with the sealing plate, and there is a gap between the shaft sleeve and the shaft; the air sealing ring is set between the sealing plate and the oil sealing ring , the air seal ring is fixed on the sealing plate, the air seal ring is set on the shaft, and there is a gap between the air seal ring and the shaft; the gap between the shaft sleeve and the shaft is smaller than the gap between the oil seal ring and the shaft and the air seal ring clearance from the shaft. The invention can effectively prevent the sealing ring from being damaged, and ensure the long-term normal operation of the blower fan.

The invention discloses a stable compact type laser-transceiving integrated detection light path structure. The stable compact type laser-transceiving integrated detection light path structure comprises a laser transceiving device and a pyramid reflector device, wherein laser output by a host laser of a monitor is coupled by an external transmission optical fiber flange, so as to enter a tail fiber in a covering cylinder, the laser is conducted to a laser alignment mirror by the tail fiber, the laser is emitted from a receiving mirror in a center opening after being aligned, passes through a sealing window mirror and a target gas detection area and then arrives at an opposite pyramid reflector of the pyramid reflector device, so as to form a reflected light beam and return along the direction of a main light path, the extended return light beam is received and laterally reflected and focused by the receiving mirror, so as to arrive at a receiving lens and a detector which is used for detecting an optical signal of a receiving spectrum, and an electrical signal output by the detector is transmitted to an output interface by virtue of a connecting wire and then transmitted to a host by virtue of an external cable. According to the stable compact type laser-transceiving integrated detection light path structure, a spectral absorption optical path is doubled, the detection precision can be increased, the application range can be extended, and the anti-vibration performance is obviously improved.

The invention relates to the technical field of damage and leakage restoration on the tops of a sulphuric acid system boiling furnace, a roasting furnace and a sulfur burning furnace in industries of smelting and the like, in particular to a furnace kiln top leakage restoration method. The overall restoration is carried out through composite restoration leakage blocking agents for furnace top fire-resistant brick layers, then, a layer of substitute heat insulation layer is cast on an integral furnace top by light-weight heat insulation materials, a furnace air leakage source is really restored for ensuring the long-period operation of equipment, under the conditions that the materials are saved, the maintenance time is reduced, the operation is convenient, and the cost is reduced, the real leakage points of the equipment can be effectively restored, the anti-corrosion performance of the equipment is improved, the service life of the equipment is prolonged, and the long-time normal operation of the equipment is ensured.

A method for the selective hydrogenation of alkynes to recover butenes, using the C4 fraction rich in alkynes after the extraction of butadiene as a raw material, in the presence of a catalyst, using an adiabatic reactor to selectively hydrogenate alkynes and dienes The hydrogen is butene, and the operating conditions of the process are as follows: the reactor inlet temperature is 25-100°C, the reaction pressure is 0.6-2.5MPa, and the liquid space velocity is 15-25h ‑1 . The catalyst is a palladium-molybdenum-silver selective hydrogenation catalyst prepared on a nickel-containing alumina carrier with a specific crystal form, which can greatly improve the dispersion and utilization of active metals and improve the hydrogenation performance of the catalyst. Adopting the method of the invention has very obvious good effects on the effective utilization of the C4 fraction rich in alkynes after the extraction of butadiene, reduction of waste of resources and improvement of economic benefits.