2342 results about "Water jet" patented technology

The invention belongs to the technical field of underground engineering, and provides a slurry shield tunneling machine carrying a high-pressure jet system and a working method thereof.The slurry shield tunneling machine comprises a cutterhead mechanism, a slurry supply mechanism and a high-pressure jet mechanism, and the slurry supply mechanism and the high-pressure jet mechanism are arranged on the cutterhead mechanism through a rotation center; the high-pressure water supply assembly comprises a first water supply pipe and a second water supply pipe which are connected through a pipeline dynamic and static conversion end. The grinding material supply assembly comprises a first supply pipe connected with the fixed end and a second supply pipe connected with the rotating end; the second water supply pipe and the second material supply pipe are jointly connected with a spray head, the spray head is arranged on the cutter head mechanism, in the soft soil layer construction process, when the cutter head mechanism suddenly encounters hard substances such as stones, high-pressure water and abrasive materials are provided for the spray head through the second water supply pipe and the second material supply pipe, and the hard substances such as the stones are cut in a water jet mode; abrasion and damage to the hob are reduced, and construction efficiency and safety are guaranteed.

The invention relates to equipment and a method for water-guided laser collaborative forcible entry of a reinforced concrete pile head based on artificial intelligence recognition, and belongs to the technical field of forcible entry equipment. Comprising a mobile chassis; the rack is mounted on the movable chassis; the water jet system is mounted on the rack and is provided with a first working part; the mechanical drill bit system is mounted on the rack and is provided with a second working part; the identifying and positioning module is used for collecting real-time data of a three-dimensional structure, steel bar distribution and a forcible entry area of the pile head; and the control unit is in communication connection with the identifying and positioning module, the water jet system and the mechanical drill bit system, and the control unit receives data of the identifying and positioning module to generate a forcible entry strategy and a mechanical drill bit path plan so as to guide the first working part and the second working part to cooperatively work. The technical problems that in the prior art, impact force of water jet forcible entry is limited, and the forcible entry efficiency of a hard core layer and a complex forcible entry environment is not high are solved.

The invention relates to the technical field of machine tool control, in particular to an electrolysis arc milling composite numerical control machine tool control method and system for case machining. The method comprises the steps that firstly, an electrolyte supply system, an electric arc generation system, a high-pressure water jet system and an ultrasonic vibration system are started in sequence, operation data are obtained, and rough machining parameters are calculated; in the rough machining process, the machining gap, the discharging state and the temperature are monitored in real time and compared with standard parameters, and correction values are calculated; after rough machining is completed and the electrolytic arc milling device is detached, the feeding speed and the spindle rotating speed are adjusted according to the correction value, and finish machining parameters are obtained; by electrolyzing electric arc corrosion materials and combining the synergistic effect of high-pressure water jet and ultrasonic vibration, efficient removal and accurate control of super-difficult-to-machine materials such as titanium alloy and high-temperature-resistant alloy in the machining process are achieved, and the machining efficiency and quality are improved.

The invention belongs to the technical field of laser processing, and particularly relates to a matrix type ultrasonic-assisted liquid guide laser processing system and method.The matrix type ultrasonic-assisted liquid guide laser processing method comprises the steps that a laser module receives a control instruction of an upper computer, outputs a laser beam and focuses the laser beam into a coupling water cavity module; the coupling water cavity module couples an incident laser beam with a water jet in the cavity, and forms a high-pressure water jet to guide the laser to act on the surface of a workpiece; the ultrasonic vibration module is used for forming ultrasonic vibration on the workpiece; the pressure-stabilizing high-pressure water module supplies water to the coupling water cavity module; the CCD machine vision monitoring module collects the position of a light spot focus of the laser beam and sends the position to the upper computer, and the upper computer adjusts the laser module in real time according to the real-time position of the light spot focus and the position of a nozzle of the coupling water cavity module. The influence of high-power ultrasonic vibration on the workpiece clamping stability can be reduced, and therefore high-quality and high-efficiency machining of large-depth-diameter-ratio micropores and surface fine structures of large thin-wall workpieces is achieved.

The invention relates to the technical field of concrete structure construction, and discloses a super-long concrete post-cast strip structure and a manufacturing method.The structure comprises an interface treatment layer, a fiber grid layer, a micro-expansion concrete layer and a steel fiber protection layer which are sequentially arranged from bottom to top, and the interface treatment layer is used for providing combination transition of new concrete and old concrete; the fiber grid layer is used for achieving deformation constraint and stress transfer, the micro-expansion concrete layer is used for forming an autonomous compensation deformation area, and the steel fiber protection layer is used for providing final structure protection and load distribution. The interface treatment layer is a concrete base surface treated by high-pressure water jet, and is coated with a silane-based interface treatment agent. The bonding strength of new concrete and old concrete is enhanced through the interface treatment layer, the fiber grid layer provides effective deformation constraint, the micro-expansion layer achieves automatic shrinkage compensation, the steel fiber layer controls crack development, the layers are matched with one another to form a complete anti-crack system, the problem that the anti-crack performance of a traditional post-cast strip is insufficient is solved, and the overall anti-crack performance is improved.

The underwater cleaning robot for the net cage and the netting comprises a robot central frame, a thrust propeller, a side thrust propeller, crawler wheels, an underwater camera, a tensioning wheel and a water jet cleaning mechanism, the water jet cleaning mechanism comprises a cleaning disc, an adjuster machine body, a water inlet pipe, a water spraying pipe and a petal-shaped cavitation spray head, and the underwater camera collects netting shaking data; after compensation thrust is calculated through feedback, a thrust propeller provides compensation force to counteract shaking of the netting, a tensioning wheel can tension the netting, the robot can be more effectively attached to the net face, in the walking process of the robot, an external high-pressure pump can pump high-pressure water into a regulator machine body through a water inlet pipe, and therefore the net face can be more effectively attached to the net face. The jet flow is sprayed out through the water spraying pipe and the petal-shaped cavitation nozzles to clean the netting, the petal-shaped cavitation nozzles on the two sides incline towards different sides, the sprayed petal-shaped cavitation fluid can drive the regulator body to rotate, rotary cleaning is achieved, and the cleaning area range and cleanliness of the jet flow are improved.

The invention relates to a device for preparing rubber powder by adopting a high-pressure water jet composite method, which comprises a high-pressure water generating system, a multi-nozzle cutting head, a rotary crushing cylinder assembly, a rotary filtering cylinder assembly, a liquid collecting cylinder, a fixed seat and a base, the fixed seat comprises an upper mounting plate, a lower mounting plate and a stand column connected between the upper mounting plate and the lower mounting plate, the multi-nozzle cutting head and the rotary crushing cylinder assembly are mounted on the upper mounting plate, the rotary filtering cylinder assembly is mounted on the lower mounting plate, the liquid collecting cylinder is mounted on the stand column, and the high-pressure water generating system is communicated with the multi-nozzle cutting head. And the rotary crushing cylinder assembly comprises a crushing cylinder and a crushing rotating device. High-pressure water jet and mechanical smashing are efficiently combined, a double smashing mechanism of non-contact cutting and mechanical shearing is achieved, the production requirement of fine rubber powder is met, layered multi-nozzle covering cutting of the multi-nozzle cutting head is achieved, and energy consumption is remarkably reduced.

The invention discloses a method for calculating carbon emission of a trailing suction dredger. The method comprises the steps that S1, the shaft power of a dredge pump is calculated; s2, calculating the shaft power of the high-pressure flushing pump; s3, calculating the main propulsion power of the trailing suction dredger; s4, drag head resistance power is calculated; step S5, forming a ship total power calculation model according to the power calculation results of the step S1 to the step S4, inputting a construction state, process parameters, a construction section and construction time, calculating the instantaneous total power of the ship, and further calculating carbon emission; s6, integrating the calculation model, and calculating the carbon emission of the construction period; s7, the construction periods of different construction sections of the channel are measured and calculated; and S8, arranging different ships for construction in different construction sections according to the calculated construction periods of the different construction sections, and calculating the comprehensive total carbon emission of the fleet in the different construction sections. The dredging efficiency is greatly improved, the energy consumption is reduced, and the carbon emission is reduced.

The present invention provides a method for designing an abrasive water jet-disc cutter combined rock-breaking cutter head, a system therefor, a cutter head and a tunnel boring machine (TBM), wherein the key technology of designing the abrasive water jet-disc cutter combined rock-breaking cutter head of the TBM are provided from the aspects of determining a combined rock-breaking combination mode, configuration of cutter operation parameters and optimization of the combined cutter head; the performance of the abrasive water jet-disc cutter combined rock-breaking cutter head manufactured according to the optimized layout parameters is improved; and a new idea is provided for the development and application of a full-section rock tunneling machine in the field of underground engineering.

The invention provides an intelligent cleaning unmanned aerial vehicle system and method based on high-pressure water jet, and relates to the technical field of unmanned aerial vehicles. The optimized path acquisition module utilizes a sensor to optimize obstacle avoidance to obtain a new path; the real-time positioning acquisition module realizes positioning by means of PTK; the cleaning area determination module determines a cleaning range according to the positioning acquisition image; and the water flow cleaning execution module starts equipment and adjusts a nozzle to complete high-pressure water jet cleaning. The technical problems that a traditional high-altitude cleaning mode is high in safety risk, low in cleaning efficiency, inaccurate in environment perception and insufficient in dynamic adaptability are solved, and safe unmanned cleaning, path optimization precision and cleaning efficiency maximization of high-rise building glass curtain wall cleaning are achieved; and therefore, the technical effects of operation reliability and intelligent level in a complex environment can be obviously improved.

The invention discloses a slurry shield cutterhead nozzle arrangement method and system, and relates to the technical field of tunnel engineering and shield tunneling machines. The method comprises the steps that the total flow of nozzles and the number of the nozzles are determined, and the sediment critical starting flow speed is calculated; obtaining a flow velocity-target distance formula according to a water jet theoretical formula, boundary value conditions and a momentum flux conservation theorem; according to the total flow of the nozzles, the number of the nozzles, the sediment critical starting flow speed and the flow speed-target distance formula, the nozzle arrangement target distance is obtained; and arranging the nozzles according to the nozzle arrangement target distance. According to the method, the arrangement target distance of the nozzles of the slurry shield cutter head is integrally and effectively designed in combination with the water jet theory and the sediment starting mechanism.

The invention provides a high-speed submerging jet flow and mechanical shock synergistic ice damage test method. The method comprises the following test steps: S1, arranging a data acquisition system; s2, initializing working conditions; s3, preparing an ice body sample; s4, prefabricating ice body damage by high-pressure water jet; s5, a servo electric cylinder drives a mechanical structure to impact ice damage; s6, data acquisition; and S7, data processing. According to the invention, the force sensor, the laser displacement sensor and the high-speed camera synchronously collect the load, deformation and image information of ice damage caused by impact of a mechanical structure by means of the servo electric cylinder under the jet-assisted effect, so that accurate control and synchronous measurement of submerged jet and mechanical cooperative damage are realized; the impact of different mechanical structures at different speeds on the ice damage load is avoided.

A self-cleaning method of a washing machine comprises the steps that after each washing procedure is finished, a system automatically detects the real-time humidity and the residual dirt concentration of an inner container of the washing machine, if the humidity is higher than a preset threshold value and the dirt concentration exceeds a datum line, an ultraviolet disinfection process is automatically triggered, UV-C lamp tubes installed on the top and the side wall of the inner container are started for irradiation sterilization, and the ultraviolet disinfection process is stopped; the duration time is 10-30 minutes, the built-in water flow nozzle module is activated in a set period or when a high dirt accumulation level is detected according to dynamic adjustment of the environment temperature and humidity and the use frequency, and the wall face of the inner container, the door seal ring and the drainage pipeline are flushed in all directions through high-pressure pulse water flow. According to the invention, the fundamental conversion from passive response to active prevention is realized, the equipment can perceive the environmental state of the inner container in real time by integrating a multi-dimensional sensor network and an AI prediction model, trend pre-judgment is carried out based on big data of user use habits, water quality conditions and washing modes, and a cleaning program is started when pollution does not appear so as to nip in the bud.

The invention relates to a method for preparing rubber powder by adopting a high-pressure water jet composite method. The method comprises the following preparation steps: S1, crushing rubber particles; s2, performing impact type filtration; s3, internal circulation of the rubber powder liquid; and S4, solid-phase separation and recovery. The cavitation effect and the high-speed impact effect in ultrahigh-pressure water jet can enable a rubber material to achieve the low-temperature crushing effect at the normal temperature, so that the purpose of preparing fine rubber powder can be achieved at the normal temperature in a low-energy-consumption, low-cost and environment-friendly manner; meanwhile, the actual filtering area of the filter cartridge is increased to the maximum extent, and the filtering effect and efficiency are improved to a great extent.

The invention relates to a ship bottom dirt removal system and a ship bottom dirt removal process, and belongs to the technical field of ship bottom dirt removal. The ship bottom dirt removal system comprises an underwater robot platform, four multi-degree-of-freedom mechanical arms, a high-pressure water jet nozzle, a sprinkler type coating nozzle, an underwater motor and an ultrasonic generator; the four multi-degree-of-freedom mechanical arms are all installed on the underwater robot platform, the underwater robot platform is provided with an underwater holder, the underwater holder is provided with a high-definition underwater camera, and the underwater robot platform is provided with a water jet pump, a liquid storage water tank and a conveying pump. According to the system, the underwater robot with the path designed through an algorithm can achieve dirt recognition, multi-mode collaborative removal (high-pressure water jet, bio-enzyme and ultrasonic wave) and self-repairing coating spraying, the system has high efficiency, environment friendliness and long-acting antifouling capacity, and the ship maintenance cost and the marine pollution risk can be remarkably reduced.

The invention discloses a method for synergistically preparing recycled aggregate from urban renewal garden waste and building waste, and relates to the field of treatment of garden waste and building waste. The method comprises the following steps: carrying out molecular-level deconstruction pretreatment on garden wastes, destroying cell walls by adopting dual-frequency ultrasound combined with biological enzymolysis, and treating the building wastes by combining high-pressure water jet with abrasive impact; performing nano-scale composite granulation, adding a nano-composite binder, and introducing CO2 to form a gel transition layer; by means of plasma-assisted sintering, particle diffusion is accelerated by means of radio-frequency plasma and an electric field; chemical vapor deposition is adopted, and a TiN-TiO2 gradient functional coating is formed; real-time monitoring and regulation are performed through a multi-mode sensor network and an intelligent algorithm, and process parameters are adjusted according to a product performance prediction result. The recycled aggregate disclosed by the invention is high in strength, good in heat preservation and strong in freezing resistance; negative carbon emission reduction is achieved in the production process, an intelligent system guarantees stable product quality, environmental protection and economic benefits are achieved, and urban update and solid waste treatment green transformation are promoted.

Food material processing equipment based on water jet comprises a sorting assembly, a food material overturning assembly I, a food material overturning assembly II, a cleaning assembly, a discharging guide rail and a material blocking assembly, the discharging end of the sorting assembly is higher than the feeding end of the food material overturning assembly I, and the sorting assembly and the food material overturning assembly I communicate with each other through the discharging guide rail; the feeding end of the food material overturning assembly II is higher than the discharging end of the food material overturning assembly I, and the feeding end and the discharging end are communicated through a discharging guide rail. The food material overturning assembly I comprises a workbench III, a revolution assembly and an autorotation assembly, the revolution assembly is rotationally installed on the workbench III, and the autorotation assembly is arranged at the rotating end of the revolution assembly. By arranging the food material overturning assembly I, quasi-cylindrical food materials can be driven to rotate through the rotating shaft, and at the moment, the rotating food materials can be cleaned. And the sheet-shaped food materials can fall into the cross-shaped overturning box, then the food materials are driven to be overturned, and then the overturned food materials are cleaned. In this way, the food materials do not need to be manually turned over, and the food material cleaning efficiency is improved.

The invention discloses a coaxial multi-atmosphere water-guided laser processing device. The coaxial multi-atmosphere water-guided laser processing device comprises a laser generating module, a light-water coupling module, a protective airflow generating module and a composite nozzle assembly. And the light-water coupling module performs total reflection coupling on the water jet and the laser through the liquid nozzle to form the laser water jet. The protection airflow generation module comprises a first protection airflow generation module and at least one second protection airflow generation module and can generate multiple layers of coaxial protection airflow, the first protection airflow spirally surrounds the outer side of the laser water jet, and the second protection airflow further surrounds the outer side of the first protection airflow. The composite nozzle assembly is composed of a first nozzle and at least one second nozzle which are sequentially and coaxially nested from inside to outside, and finally outputs coaxial composite jet flow composed of laser water jet flow and multiple layers of protective airflow. The technical problem that in the prior art, it is difficult to achieve efficient drainage, prevent melt from splashing back and maintain stability of water jet at the same time is solved.

An underwater cleaning robot for the net of a cage, comprising a central robot frame, a thrust propeller, side thrust propellers, crawler wheels, an underwater camera, a tensioning wheel and a water jet cleaning mechanism. The water jet cleaning mechanism includes a cleaning disc, a regulator body, a water inlet pipe, a water spray pipe and a petal-shaped cavitation nozzle. The underwater camera collects the net shaking data, and after calculating the compensation thrust through feedback, the thrust propeller provides a compensation force to offset the net shaking. The tensioning wheel can tension the net, making the robot fit the net surface more effectively. During the walking process of the robot, an external high-pressure pump can pump high-pressure water into the regulator body through the water inlet pipe, and spray it out through the water spray pipe and the petal-shaped cavitation nozzle to achieve the cleaning of the net. The petal-shaped cavitation nozzles on both sides are inclined to different sides, and the petal-shaped cavitation fluid ejected can drive the regulator body to rotate, realizing rotary cleaning and improving the cleaning area range and cleanliness of the jet.

The invention discloses a shield tunneling machine cutterhead water jet control method, and relates to the technical field of shield tunneling machine engineering, and the method comprises the steps: obtaining the current rotation state parameters of a cutterhead and the geological parameters of a tunneling face; determining the wear risk level of each area of the cutterhead according to the parameters; whether a high-risk area exists or not is judged, if yes, a directional water jet mode is started to conduct centralized scouring on the high-risk area, and if not, a uniform water jet mode is started to conduct comprehensive scouring on the cutterhead; cutting efficiency parameters are monitored in real time, whether the cutting efficiency parameters are lower than a preset efficiency threshold value or not is judged, and if yes, a pulse water jet mode is started to remove adherends on the surface of the cutterhead. Partition precise control and multi-mode intelligent switching of water jet are achieved, the cutter head protection effect and the water resource utilization efficiency are improved, and the service life of the cutter head is prolonged.

The desert nursery stock planting vehicle comprises a chassis, a nursery stock box, a nursery stock conveying mechanism, a grabbing mechanical arm, a planting mechanical arm, a seedling planting mechanical arm, a water tank and a water pump. The seedling conveying mechanism comprises a first conveying mechanism and a second conveying mechanism, the grabbing mechanical arm transfers seedlings on the first conveying mechanism to the second conveying mechanism, the seedling planting mechanical arm grabs the seedlings and places the seedlings into the high-pressure water jet planter, and the water tank supplies water to the high-pressure water jet planter through the water pump. The chassis is a self-driven chassis and can adapt to complex desert terrains. According to the desert nursery stock planting vehicle, through cooperative operation of multiple manipulators, automatic conveying, grabbing and planting of nursery stocks are achieved, the planting efficiency and the planting quality are improved, and water resources are saved.

A water-guided laser assembly and a precision machining assembly are fixed to the same side of a sliding plate of a vertical five-axis machine tool, an ultrasonic vibration platform is installed on a C-axis workbench of the vertical five-axis machine tool, and the water-guided laser assembly, the ultrasonic vibration platform and the precision machining assembly are controlled by an industrial personal computer to cooperate with each other; a positioning measuring head is adopted to realize relative compensation of the water jet and the cutter; the water jet cooling effect is utilized in water-guided laser processing to reduce the heat affected area and improve the processing quality; ultrasonic vibration auxiliary machining effectively reduces cutting force, inhibits the surface water return phenomenon, improves machining efficiency and prolongs the service life of a cutter; and precise machining (milling, grinding and drilling) is carried out, so that the machining size precision is accurately corrected, and the residual laser-induced damage layer is removed. Through multi-energy-field in-situ combined machining, collaborative optimization of technological parameters and coordinate compensation, the problems of insufficient precision, low efficiency, thermal damage and the like during machining of complex geometrical shapes and difficult-to-machine materials in a single machining technology are solved.

The present invention relates to a high pressure water jet automatic drilling and cutting collaborative system and method for coal seams, and belongs to the field of coal seam gas control. The system comprises a drilling and cutting collaborative control platform, an automatically regulated slotting pump unit and an automatically regulated drill; the drilling and cutting collaborative control platform comprises a coalbed gas geology management system, a decision analysis system, a drilling and cutting collaborative execution system, a monitoring and feedback system, and an information management and evaluation system; construction operation parameter instructions issued by the drilling and cutting collaborative control platform are executed by the automatically regulated slotting pump unit and the automatically regulated drill; coal seam geological information is recorded by the coalbed gas geology management system, and reasonable drilling and cutting construction parameters are analyzed and formulated by the decision analysis system based on the coal seam geological information. Drilling and cutting collaborative construction, on-site operation construction parameter monitoring, and real-time feedback and adjustment are realized by the drilling and cutting collaborative execution system and the monitoring feedback system according to the operation parameter instructions. Coal seam outburst prevention and control effects in a drilling and cutting collaborative implementation area is evaluated by the information management and evaluation system. The present invention improves safety of on-site operators, and reduces personnel input and labor intensity.

The invention relates to the technical field of fluid mechanics, in particular to a method for extracting cavitation water jet unsteady flow field characteristics, which comprises the following steps: S1, performing three-dimensional modeling on a nozzle for cavitation water jet calculation and a fluid domain thereof to generate a three-dimensional model; s2, performing grid division on the three-dimensional model, and importing Fluent for numerical simulation to obtain flow field simulation data; s3, importing the flow field time sequence data into Tecplot, and exporting the grid node data into a flow field snapshot sequence in batches; s4, through a Python program, extracting flow field data to form a matrix; s5, POD decomposition is carried out in the compiled Python program; s6, carrying out DMD (Digital Micromirror Device) decomposition in the compiled Python program; s7, the modal data obtained after POD and DMD decomposition are subjected to topological distribution to the grids to generate the spatial modal diagrams. According to the method, the analysis flexibility is improved, and the method is suitable for various scenes.

The invention relates to a water jet-laser / mechanical energy field cooperative precision machining method for a ceramic base material, and belongs to the field of laser-mechanical cooperative machining. During the execution period, the method comprises the following steps in sequence: firstly, carrying out rapid and low-damage precise material reduction on the ceramic matrix composite material through water jet assisted laser; and then, a superhard forming grinding wheel on the same machine tool is matched with mixed grinding fluid to conduct in-situ finishing and polishing on the surface obtained after material reduction. Wherein the surface quality can be improved while high-efficiency machining is ensured through the synergistic combination of laser and machinery. Through the in-situ grinding and polishing effect of the grinding wheel and the mixed grinding fluid, the precision of a formed surface is higher, and a damaged layer is thinner and even completely removed. Based on a water jet assisted laser milling / mechanical grinding and polishing collaborative machining strategy, rough machining, finish machining and fine polishing of the ceramic matrix composite can be completed on the same equipment, and the method has the characteristics of being high in precision, high in efficiency, high in quality and extremely low in surface damage.

The invention relates to the technical field of coal mining and mine safety engineering, and discloses a coal pillar stability dynamic monitoring and pressure relief control method for gob-side entry driving, which comprises the following steps: collecting multi-field coupling signals of a coal pillar, and collecting environmental data of a roadway; analyzing the stability of the coal pillar according to the multi-field coupling signal, and when an analysis result does not meet a stable condition and the environmental data does not meet an environmental condition, generating a cooperative control instruction of the high-pressure water jet system integrated with the solid-liquid waste collection device; executing directional hydraulic fracturing pressure relief operation on the coal pillar area according to the cooperative control instruction, and monitoring the stress distribution and fracture closing state of the coal pillar after pressure relief; hydraulic parameters of the high-pressure water jet system are adjusted according to the coal pillar stress distribution and the fracture closed state; and when the coal pillar recovers the stable state and the environmental data meet the environmental conditions, controlling the pressure relief operation of the coal pillar area according to the cooperative stop instruction. According to the method, the accuracy of dynamic monitoring and pressure relief control of the stability of the coal pillar of gob-side entry driving can be improved.

The invention discloses a ground single-hole multi-branch water jet radial coal breaking and permeability increasing extraction method, which comprises a directional drilling system, a filling system, a water jet coal breaking system, a deslagging system and a gas extraction system, and is characterized in that a vertical drilling hole is constructed on the ground, a centralizer and a whipstock are arranged at a coal seam junction, and a drill bit deflects to enter a coal seam construction horizontal branch drilling hole; three horizontal branch drill holes are constructed in each coal seam, the included angle is 120 degrees, after horizontal branch drill hole construction is completed, water jet coal breaking is carried out once every time a drill rod is withdrawn, coal seam air permeability is improved until all the drill rods are withdrawn, the process is repeated, drilling and water jet coal breaking work is carried out on other horizontal branch drill holes, and drill rods and drilling tools are withdrawn after all the work is completed. And the flange of the ground casing pipe is connected into an extraction system. The gas extraction work of the ground drilling coal seam group is realized; drill retreating and water jet coal breaking are carried out synchronously, and the air permeability of a coal seam is improved; gas extraction work of the coal seam group is achieved through ground drilling, and the gas control level is improved.

The invention provides a pipeline detecting and cleaning robot, which belongs to the technical field of pipeline robots and comprises a main body, a first motor, an image acquisition detector and a cleaning assembly. Two supporting assemblies are arranged on the main body, each supporting assembly comprises a plurality of supporting rods evenly arranged in the circumferential direction of the main body in a surrounding mode, one ends of the supporting rods are connected with the main body, the other ends of the supporting rods are provided with walking wheels, the first motors are arranged on the supporting rods, the main body is driven to move in a pipeline by driving the walking wheels, and the image acquisition detector is arranged at the front end of the main body. The cleaning assembly is arranged at the front end of the main body and comprises a crushing wheel and a high-pressure water spray head, the crushing wheel is driven by a second motor arranged at the front end of the main body and used for crushing garbage, and a high-pressure water spray head pipe is arranged towards the front end of the main body and used for spraying high-pressure water to wash the garbage. The pipeline detecting and cleaning robot provided by the invention can replace manual work to detect and clean the pipeline, so that the safety and the convenience are greatly improved.

A fountain attachment for water features having an adjustable nozzle for producing dynamic water images at the nozzle outlet, the nozzle having at least one outer nozzle tube (3) and an inner nozzle body (5), has at least one effect attachment (1) which is detachably connected to the outer nozzle tube (3) in the region of the nozzle outlet and has a plurality of apertures (7) which divide a goblet-like water jet into individual jets. There may also be an effect attachment (2) detachably connected to the inner nozzle body (5) in the area of the nozzle outlet.

The invention relates to the technical field of dust removal, in particular to a compressed air photovoltaic panel dust removal system under multiple working conditions, which comprises an air compressor, the air compressor is connected with a compressed air energy storage tank, and the air compressor is used for conveying compressed air to the compressed air energy storage tank; the compressed air energy storage tank is communicated with an airflow pipeline through an air outlet, the other end of the airflow pipeline is communicated with a cleaning device, and the cleaning device is used for blowing and cleaning dust on the photovoltaic panel; the problems of secondary abrasion of a photovoltaic panel and waste of water resources caused by traditional mechanical friction and water jet dust removal modes are solved.