54results about How to "Reduce construction and maintenance costs" patented technology

The invention discloses an indoor distributed system integral switch power source and a power supply method of the indoor distributed system integral switch power source. Firstly, an external connection high-voltage direct current is input in a direct current-direct current rectifier module, alternating current commercial power is input in an alternating current-direct current rectifier module, a plumbic acid / lithium-ion two-in-one charging management system monitoring unit is used for starting a plumbic acid storage battery charging management process or an iron lithium battery charging management process according to the types of storage batteries, then staring a cross coupling shielding system and finally conducting outputting. By means of the technical scheme, the power source is small in size and is microminiaturized, high-capacity plumbic acid and lithium-ion batteries can both be installed and used in a compatible mode, the environment temperature characteristic can be well adapted, the charging management on the lithium battery and the plumbic acid battery can be simultaneously achieved, the requirements for flexible and variable installation fields of communication equipment, power supplying and backup time discharging are met, and the building and maintaining cost of the equipment are reduced.

The invention relates to a flowing current separation process coal mine underground gangue dumping system. The technical scheme includes that a run-of-mine coal conveyor is mounted on one side of a feeding end of a roller screen, two ends of an on-screen selected raw material coal conveyor are connected with a front-screen chute of the roller screen and a feeding port of a flowing current separation machine respectively, a block coal of the flowing current separation machine is connected with a dewatering screen, an oversize material discharging end of the dewatering screen is sequentially connected with a block coal conveyor, a block coal transferring conveyor and a pulverized coal conveyor, a high frequency screen is mounted in the middle of the block coal conveyor, under-screen water of the dewatering screen is connected with a concentration tank through a pipeline, the concentration tank is connected with the high frequency screen, a gangue outlet of the flowing current separation machine is connected with a bucket elevator, a discharging end of the bucket elevator is sequentially connected with a gangue conveyor, a gangue transferring conveyor and a gangue warehousing conveyor, under-screen water of the high frequency screen and overflow of the concentration tank are connected with a circulating water tank through pipelines respectively, and the circulating water tank is connected with a water inlet of the flowing current separation machine through a circulating water pump and a pipeline. The flowing current separation process coal mine underground gangue dumping system is simple in process, good in separation effect, low in power consumption and low in operating cost.

The invention provides an assembly type hydraulic box culvert template and a construction method of a prefabricated assembly type box culvert of the assembly type hydraulic box culvert template, and belongs to the field of highway engineering construction. The assembly type hydraulic box culvert template comprises a template, a hydraulic power system and an adjusting support. The construction method comprises the steps that the assembly type hydraulic box culvert template is installed; the template is used; steel bars are machined and installed; a steel bar framework is hoisted put into the template; an internal mold is installed; the template is installed while concrete is poured; the concrete is poured; the concrete is cured; and the template is removed, and finally the prefabricated assembly type box culvert is prepared. The box culvert can be prefabricated in a centralized mode, and is installed on site, so that a lot of concrete is saved, the construction progress is accelerated,construction cost is reduced, damage and pollution to underground water and soil are greatly reduced, and the box culvert is especially prominent in green and environment-protecting aspects; and the entity quality of culverts is effectively improved, the yield of the appearance and a protection layer is greatly improved, and good economic and social benefits are obtained.

The invention relates to a train reduced scale model device for aerodynamic noise wind tunnel test and a noise test method of the train reduced scale model device, and belongs to the technical field of high-speed train aerodynamic noise test. The device comprises a lower-end fully-closed base, a reduced scale model vehicle body, a plurality of reduced scale passage connection parts, a reduced scale rail, a reduced scale pantograph, a pantograph reduced scale diversion cover, a plurality of reduced scale steering racks and a reduced scale wheel set thereof, wherein the lower-end fully-closed base is used for a detachable reduced scale vehicle body, the reduced scale model vehicle body is provided with a reduced scale cowcatcher and is not provided with a steering rack, and the reduced scalemodel vehicle body and a sub-structure to which the reduced scale model vehicle body belongs are one eighth of sizes of a corresponding true vehicle to be tested and the rail. With regard to the characteristics of a high-speed train model and a noise source position, different model structures are designed to process different noise sources, a free field sensor and sensor array equipment for voice source identification are arranged outside a flow field and are used for acquiring voice radiation information of a model noise source on the outside and information of the noise sources, the main noise source characteristics on the model are analyzed, and the problem of noise contribution of the noise source to the whole model is analyzed.