188results about How to "Prevent gushing" patented technology

The invention belongs to the technical fields of fluid machinery engineering, cryogenic engineering and aerospace engineering and relates to cavitation experimental devices, in particular to a cryogenic liquid cavitation experimental device. The cryogenic liquid cavitation experimental device comprises a testing segment part, a pressure-regulating tank part and an auxiliary device part. Different from a traditional cavitation experimental device, the cryogenic liquid cavitation experimental device is characterized in that pressure and temperature adjustment is performed on the experimented cryogenic liquid through pressure control, and flowing adjustment is performed through pressure difference between a supply tank part and a collection tank part. The device can achieve synchronous collection of images, pressure data, temperature data and flow data of a cryogenic liquid cavitation flow field, and is good in experiment effect and high in safety; in addition, experiment equipment is easy and portable, convenient to disassemble and carry, small in occupied space and capable of saving experiment area.

The invention belongs to the technical field of shield tunnel engineering and particularly relates to a shield tunnel portal sealing device and a shield tunnel portal sealing method. The shield tunnel portal sealing device comprises a lined wall, an embedded steel ring is arranged on the lined wall, a sealing box is arranged on the embedded steel ring and comprises a sealing steel ring, a fixing plate, a fold type support plate and two waterproof structures, a plurality of grease injecting holes are evenly circumferentially reserved in the sealing steel ring between the two waterproof structures, each waterproof structure comprises a steel wire brush and a cord fabric rubber plate, the cord fabric rubber plates are arranged on one side close to the embedded steel ring, and grouting holes are reserved in the lined wall and in the sealing steel ring on the inner sides of the cord fabric rubber plates. The shield tunnel portal sealing device has the advantages that the cord fabric rubber plates are primarily used for sealing to prevent a major part of water and soil from pouring out, so that 'pouring prevention' is achieved; water penetration is prevented as the steel wire brushes secondarily achieve seamless contact with a shield tunneling machine shell or duct pieces; and the grouting holes reserved in the lined wall and the sealing steel ring can achieve grouting sealing timely in emergencies.

The invention discloses a multifunctional cold storage preservation storehouse. The multifunctional cold storage preservation storehouse comprises a storehouse body and an intelligent control system which is connected with the storehouse body and controls the storehouse body. The storehouse body is provided with a liquid nitrogen adjusting system and a humidity adjusting system. The liquid nitrogen adjusting system comprises a refrigerant tank installed at one end outside the storehouse body, a temperature sensor, an oxygen concentration sensor, a liquid nitrogen conveying pipeline and an atomization nozzle. The temperature sensor, the oxygen concentration sensor, the liquid nitrogen conveying pipeline and the atomization nozzle are arranged in the storehouse body. The humidity adjusting system comprises a humidity sensor and a humidifier. The multifunctional cold storage preservation storehouse has the main advantages that the application occasions are wide, and the structure is simple and convenient; liquid nitrogen serves as a refrigerant, so that no additional resources need to be consumed for heat exchange, equipment is simple, and fast cooling can be achieved; and data in the storehouse can be monitored in real time, the refrigerant tank can be locked in all directions and can be replaced conveniently, all indexes of the storehouse body can be monitored automatically and precisely, and data are recorded, saved, printed and transmitted.

The invention relates to an earth pressure balance shield foaming agent and a preparation technology thereof. The earth pressure balance shield foaming agent is prepared from 4-15% by weight of sodium dodecyl sulfate, 1-10% by weight of cetyltrimethylammonium chloride, 2-8% by weight of cocamidopropyl betaine, 1-5% by weight of dodecyldimethylamine oxide, 0.1-0.5% by weight of disodium ethylene diamine tetraacetate, 0.1-2.0% by weight of a tackifier and the balance water. The earth pressure balance shield foaming agent has a simple formula and high effects, and utilizes cetyltrimethylammonium chloride with excellent permeability, flexibility, emulsification effects and sterilization performances as a cationic surfactant which can be mixed with other surfactants. The earth pressure balance shield foaming agent is environmentally friendly, has excellent permeability and lubricity and can effectively improve excavated soil fluidity and watertightness.

The invention discloses a shield tunnel initial sealing device and a use method thereof. The shield tunnel initial sealing device is characterized by comprising an initial sealing bucket; at least two annular high-elasticity tail brushes and at least one annular airbag are arranged on the inner wall of the initial sealing bucket; a grease pipeline and an inflation pipeline are arranged inside the wall of the initial sealing bucket; a gap formed between every two adjacent high-elasticity tail brushes communicates with the grease pipeline; the airbag communicates with the inflation pipeline; a supporting frame is arranged on the lower portion of the outer wall of the initial sealing bucket; and an extendable supporting system and a telescopic wheel pair are arranged at the bottom of the supporting frame. The use method of the shield tunnel initial sealing device comprises the steps of positioning and installation of the shield tunnel initial sealing device, interval sealing of a shield tunneling machine and the initial sealing device, and interval sealing of a lining segment and the initial sealing device. The shield tunnel initial sealing device and the use method thereof have the advantages that end mud sand can be effectively sealed under the initial condition that a shield tunnel is not reinforced, initial safety is ensured, the device is easy to use and recyclable, the shield initial expense can be greatly reduced, and the shield initial duration can be greatly shortened.

The invention discloses a U-shaped closed screw machine anti-gushing system capable of separating slag and water and an anti-gushing method, and aims to solve the problems of poor effect and single slag discharging mode of an anti-gushing mechanism of a screw machine in the prior art. The system comprises a U-shaped sealing box body in sealing connection with a first screw conveyor, wherein a second screw conveyor is arranged in the U-shaped sealing box body, and a slag outlet of the second screw conveyor corresponds to a rear matched continuous belt conveyor; the bottom of the U-shaped sealing box body is provided with a slag-water separation mechanism. According to the system, the U-shaped closed box body capable of separating slag and water is additionally mounted, so that when a water-rich and high-water-pressure stratum is encountered in the shield tunneling process, the spiral conveyor works together with a mud pump to effectively separate and convey the slag, soil and water, andthe shield construction is stopped because of a gushing phenomenon generated when the spiral conveyor discharges slag.

The invention discloses a rectangular pipe jacking construction technology, and particularly discloses a construction method for opening a hole between rectangular pipe jacking channels. The construction method comprises the following steps: construction preparation, freezing hole construction, freezing station mounting, active freezing and maintenance freezing, excavating and building construction, freezing hole plugging, and thaw settlement grouting. Through the arrangement of a freezing hole, and arrangement of preventive measures in the construction process of the freezing hole, the construction safety and the construction effect are ensured; for contact channel excavating and building construction, earth excavation is carried out in a layering and blocking removal way, so that the structural stability after contact channel construction is ensured and damage to a surrounding structure is small; after completion of the contact channel construction, the thaw settlement grouting is performed through grouting holes preserved in the two sides of the hole opened between the pipe jacking channels, and preserved in a top plate and a bottom plate, so that ground settlement and structural deformation are controlled; by the construction method, the construction problem of the hole between the rectangular pipe jacking channels is solved, the construction process is safe, the opened channel structure is stable and reliable, and the construction efficiency is high.

The invention discloses a construction method of an earth pressure balance shield tunneling machine muck pressure maintaining pumping device. Before an earth pressure balance shield tunneling machine is tunneled into a stratum which is high in water permeating performance or high in requirement for sedimentation controlling, the soil outlet of the earth pressure balance shield tunneling machine is connected with a pressure maintaining pumping device body, bentonite or foam and others used for preventing gushing is added to a soil bin to carry out muck improvement in the pumping process, the pressure in the soil bin of the earth pressure balance shield tunneling machine can be effectively controlled by controlling the discharge capacity of the pumping device body, gushing or poor sedimentation controlling and other situations are avoided, the earth pressure balance shield tunneling machine can have the functions of an earth pressure shield and a slurry shield and is especially suitable for requirement of composite stratum construction, the requirement of stratum construction with different conditions can be met conveniently and quickly, and therefore the construction difficulty is greatly lowered, the construction cost is greatly reduced, and the construction safety is greatly improved.

The invention discloses a pneumatic auxiliary device for shield tunneling machine soil pressure balance. The pneumatic auxiliary device for shield tunneling machine soil pressure balance comprises anair system and a pressure maintaining system, wherein the air system is connected with a soil bin and can inject gas into the soil bin; the pressure maintaining system is used for monitoring the pressure in the soil bin and controlling the air system whether to inject gas into the soil bin; the air system comprises an air compressor, a gas storage tank and a freezing dryer; the input end of the gas storage tank is connected with the output end of the air compressor; the input end of the freezing dryer is connected with the output end of the gas storage tank; the output end of the freezing dryer communicates with the internal part of the soil bin through an air pipeline; the pressure maintaining system comprises a control valve, a pressure transmitter and a control device; the control valveis arranged on the air pipeline; the pressure transmitter is used for measuring the pressure in the soil bin; and the control device is connected with the pressure transmitter and the control valve separately and controls the control valve to open and close. The pneumatic auxiliary device can reduce load when a shield tunneling machine tunnels, force back underwater through gas pressure, guarantee synchronous grouting quality, reduce abrasion of a cutterhead and a cutter, avoid mud cake of the cutterhead and improve tunneling efficiency.

The invention discloses a stable foaming agent for shield construction of a complex stratum and a preparation method and an application of the stable foaming agent, and solves the problems that the foaming agent for an earth pressure balance shield is low in foaming capacity, poor in foaming stability performance and poor in hard water resistance, and is not green or environmentally friendly in the prior art. The stable foaming agent has the advantages of high foaming expansion, long half foam life period and good biodegradability, and comprises the following components of 8-14% of foaming agent, 0.2-0.5% of thickener, 0.1-0.5% of foam stabilizer and the balance of water, wherein % refers to mass percent, and the foaming agent comprises alpha-olefin sulfonate, alpha-sulfonated fatty acid methyl ester and alkyl polyglucosides.

The invention discloses a muck modifier guaranteeing smooth tunneling of a shield tunneling machine. The muck modifier consists of sodium bentonite slurry, foam solution and shield slurrying agent, wherein the amount of the sodium bentonite slurry is 0-60 parts by mass, the amount of the foam solution is 50-70 parts by mass, the amount of high-molecular polymer is 0.5-1 part by mass, and the amount of the shield slurrying agent is 3-5 parts by mass. The muck modifier disclosed by the invention not only can ensure smooth tunneling of a shield tunneling machine, but also can reduce the abrasion of cutter and tool as well as the replacement of tool so as to lower the cost, shorten the construction period and guarantee safe operation of an engineering.

The invention relates to an ink box, and belongs to the technical field of printing. The ink box comprises an ink box body, an ink storage cavity, a sponge groove, an ink injection pipe, an ink discharge pipe, an air intake and an ink discharge opening. The ink storage cavity is located in the ink box body. The air intake is connected with the ink injection pipe and located in the top of the ink box body. The ink discharge opening is connected with the ink discharge pipe. The sponge groove is located in the bottom of the ink storage cavity. The sponge groove is of a closed structure with the two ends provided with a first air hole and a second air hole respectively, and a sponge is arranged in the sponge groove. The sponge groove is connected with the ink storage cavity through the first air hole and connected with the ink injection pipe through the second air hole. The ink box is simple in structure, easy to machine, convenient to use, smooth in printing, capable of saving ink, not prone to leakage and reliable in performance.

The invention discloses a tube push bench and a recyclable construction method of a main machine of the tube push bench. The technical problems that an existing tube push bench cannot perform shield construction on an integrated sinking type pump house in a contact channel and the main machine is difficult to recycle are solved. The tube push bench comprises a shield, a host-driven cutter system is arranged in the shield, and a shield inner sleeve is detachably connected into the shield. The main machine is arranged in the shield inner sleeve, an outer edge tool is arranged at the outer edge of the cutter system, the outer edge tool is circumferentially and fixedly connected with the cutter system and axially downwards and one-way rotatably hinged to the cutter system, a rack is arranged outside the shield, and a pushing system matched with the shield is arranged at the top of the rack. The tube push bench is wide in application range, high in safety and high in construction efficiency.

The invention provides an inorganic foaming filling and reinforcing composition for a coal mine as well as a using method and application thereof. The inorganic foaming filling and reinforcing composition for the coal mine can be used as a novel safe plugging and reinforcing material, is especially suitable for plugging and reinforcing of the coal mine, and is the best water-proof, fire-proof, gas-proof, collapse-proof and accident-proof material.

The invention discloses a shield machine starting device with an adjustable seal. The shield machine starting device comprises a tube body arranged on a bottom frame, wherein a starting well embedded steel plate connecting plate is arranged on the bottom frame, the front end of the tube body is provided with a hole door connecting flange, a shield machine support device is arranged on the inner surface of the tube body, a negative ring pipe sheet is in lap joint at the tail part of the tube body, and the lap joint part of the tube body and the negative ring pipe sheet is provided with a rubber sealing device. The shield machine starting device has the advantages that the tube body and the negative ring pipe sheet can form a sealed cavity with a hole door and a shield body, when a hole door seal is damaged, the outward leakage of the digging surface pressure can be effectively prevented, and the occurrence of slurry leakage, spraying and collapse can be prevented. Meanwhile, when much water overflows from the digging surface or the pressure is too high, the sealing capability of the rubber seal can also be enhanced through tightly screwing a sealing compression screw bolt, the collapse caused when the shield machine runs into a reinforcing region can be avoided, and the construction risk and the construction cost are greatly reduced.

The spewing-preventing fire hydrant equips valve bolt and valve bolt rod. The lower part of the valve bolt rod links valve. Its characteristic is that the valve is spewing-preventing valve, comprising of hollowing-out valve seat and conic valve clack. On the valve clack there links valve clack rod on which equips spring. The valve clack rod is connected to the valve bolt through hemispherical joint. When the fire hydrant is impacted, the spigot body is separated at the surface of fracture. Because the hemispherical joints of the valve bolt rod and clack rod pole are separated, it can protect the underground spigot body. The often closed unidirectional valve is operated by any outer force, and the subulate valve petal and hollowing-out valve pedestal are operated by the spring force, they all form closed states, and can effectively prevent spewing. The optimized plan equips current capacity measurement device: on the valve clack rod there is measuring impeller on which fixed small magnet, and the corresponding place of the spigot body fixes magnetism sensor whose output is connected to the microprocessor. In the waterway there can be also equipped with valve state sensor, hydraulic pressure sensor and network communication interface, to structure fire hydrant current capacity measurement information terminal device and form network.

The invention discloses a method for constructing an anchor cable on a sand layer, and belongs to the technical field of supporting of foundation pits. According to the technical point, the method comprises the following steps of: (1) drilling a hole in a foundation on the rear side of a constructed foundation pit supporting structure according to design requirements; (2) cleaning a drilled hole wall; (3) putting the anchor cable into the cleaned hole; (4) filling cement mortar or cement slurry into the hole to fix the anchor cable; and (5) tensioning to lock the anchor cable when the cement mortar or the cement slurry reaches designed intensity. The method is characterized by comprising the following steps of: in the hole drilling process in the step (1), drilling by using a double-layer structure, namely drilling by arranging an outer sleeve at the periphery of a pivoted lever of a drilling machine when the drilled hole is positioned on a sand layer rich in water, and keeping the outer sleeve in the sand layer rich in the water without extraction after hole drilling construction is finished. The method for constructing the anchor cable on the sand layer is easy and convenient to operate and is used for constructing the anchor cable in the foundation pit supporting process; and by the method, sand can be effectively prevented from overflowing out of the sand layer rich in the water.

The invention discloses a soil pressure shield waste soil flow plasticity improvement method suitable for a sandy cobble stratum. The soil pressure shield waste soil flow plasticity improvement methodincludes the following steps that S1, according to a geological investigation report, the content of sandy cobble stratum fine particles in the total mass of the stratum is determined as the actual fine particle content; S2, the critical fine particle content is determined by a sandy cobble fluidity model; S3, according to the actual fine particle content and the critical fine particle content, the type of an improver is determined; and S4, the mixing amount of the improver is determined according to the actual fine particle content, wherein the fine particles in the S1, the S2 and the S3 refer to particles with the particle size less than 2 mm. According to the method, the sandy cobble stratum with the characteristic of 'three highs' has the good fluidity, cutter torque of a shield tunneling machine is lowered, cutter pasting is avoided, the viscosity of waste soil is lowered, the stability of the tunnel face is maintained, earthwork overexcavation is controlled, surface collapse andstagnant discharge or flowing are prevented, and the excavation efficiency is improved.

The invention discloses a screw motor deflecting drilling device. The screw motor deflecting drilling device comprises a drill bit, wherein one end of the drill bit is fixedly connected with a screw motor, and the end, far away from the drill bit, of the screw motor is fixedly connected with a motor tool face; the end, far away from the screw motor, of the motor tool face is fixedly connected witha lower non-magnetic drill rod and an upper non-magnetic drill rod, the outer side wall of the lower non-magnetic drill rod and the outer side wall of the upper non-magnetic drill rod are fixedly sleeved with a measuring exploring pipe, and the end, far away from the lower non-magnetic drill rod, of the upper non-magnetic drill rod is fixedly connected with a drill rod; and the end, far away fromthe upper non-magnetic drill rod, of the drill rod is fixedly connected with a water feeder, and the side face of the water feeder is provided with a high-pressure water feeding rubber pipe in a communicating mode. According to the screw motor deflecting drilling device, high-pressure water flow is provided by a slurry pump to drive the screw motor to rotate and drill, a drilling machine appliesbit pressure to an in-hole drilling tool, and the drill hole construction orientation adjustment or branch opening is achieved by adjusting the motor tool face, so that the traditional problem of extraction drill hole collapse caused by the change of the drill hole surrounding rock stress is solved.

The invention discloses a gas-water-slag separation buffer gas-proof gas injection device for coal mining. The device comprises an ore body, a drilling machine, a buffer tank and a gas coal dust collector, wherein the drilling machine is fixedly connected to the ore body through a connecting member; a first through hole and a second through hole corresponding to the position of the drilling machine are disposed on the ore body; the first through hole and the second through hole are in communication with each other; the lower end of the drilling machine is provided with a drill pipe; the lowerend of the drill pipe runs through the first through hole; the gas coal dust collector is located in the buffer tank; the inner bottom of the buffer tank is fixedly connected with two buffer mechanisms; and the upper ends of the two buffer mechanisms are fixedly connected with a support plate. The device is compact in structure, prevents a large number of gas from escaping along a drill hole in acoal seam mining process by pumping a gas mixture at a coal mining position, thereby improving the personal safety of workers to a certain extent, and is able to separate the pumped gas mixture to reduce a waste of a large amount energy.

The invention discloses a spewing prevention device, a use method thereof and a spiral conveyor. The spewing prevention device is used for preventing the spiral conveyor from spewing in the tunnelingprocess of a soil pressure balance shield machine, and comprises a residual soil conveying pipeline connected with the output end of the spiral conveyor, a near-end gate valve mounted on the conveyingpipeline and used for controlling the spiral conveyor to discharge residual soil into the residual soil conveying pipeline, an air source connecting structure mounted on the residual soil conveying pipeline and used for being connected with an air source generating device, and a far-end gate valve mounted on the residual soil conveying pipeline and located in the output direction of the air source connecting structure. The air source generating device conveys compressed air into the residual soil conveying pipeline towards the far-end gate valve through the air source connecting structure toprovide residual soil conveying power for conveying residual soil into a residual collecting device of a shield tunneling machine. According to the spewing prevention device, part of residual soil located at the output end of the spiral conveyor is discharged, the pressure of the residual soil at the output end of the spiral conveyor is lowered to prevent spewing.

The invention provides a freezing construction method for a tunnel contact channel. The freezing construction method comprises the steps that construction preparation is conducted; a freezing curtainis designed, and it is ensured that the frozen soil strength meets the requirements; freezing holes are designed; and temperature measuring holes and pressure relief holes are designed. Compared witha traditional freezing construction method for a tunnel contact channel, by setting the reasonable positive freezing time, the designed heat dissipation amount of each meter of freezing tube comprising a frozen rack tube is not less than 100 kcal / h, the low saline water temperature and the high saline water flow are adopted, thus the freezing speed is increased, the pressure relief holes are formed in the proper positions, and the influence of frost heaving on a tunnel is reduced; and by setting reasonable freezing hole number, distribution and mounting parameters on the contact channel, the requirements of the freezing holes in the contact channel are met, gush of a large amount of muddy water during drilling is prevented, construction is safe, and thus the excavation requirements of thecontact channel are met.

The invention discloses a car washing pool and an assembling method thereof. The car washing pool comprises a downhill part (1), a ponding part (2) and an uphill part (3), wherein the front end and the rear end of the ponding part (2) are respectively fixed with the uphill part (3) and the downhill part (1); two sides of the downhill part (1), the ponding part (2) and the uphill part (3) are respectively provided with a side wall (4); each side wall (4) consists of a front wall (4.1) and a rear wall (4.2); the ponding part (2) consists of a front ponding part (2.1) and a rear ponding part (2.2); the front ponding part (2.1), the uphill part (3) and two front walls (4.1) form an integral front half pool body, the rear ponding part (2.2), the downhill part (1) and two rear walls (4.2) form an integral rear half pool body, and the front half pool body and the rear half pool body are subjected to screw joint fixing. The method has the key that the front half pool body and the rear half pool body are prefabricated and then are transported to a construction site field to be assembled. The car washing pool and the assembling method have the advantage of convenient and quick installation and disassembling processes.

The invention provides a coal mine drilling blowout preventer comprising an orifice casing. A blowout preventing shutter is fixedly connected to the top of the orifice casing through flanges, and each of two ends of the blowout preventing shutter is connected with a wheel disc through a lead screw. The coal mine drilling blowout preventer is reasonable in structure, small in size, high in strength and high in safe reliability. By the adoption of two blowout preventing facilities, sealing property and blowout preventing effect are good, and sudden blowout of water or gas coal dusts can be prevented. The coal mine drilling blowout preventer using the flanges for connection is simple to operate and convenient to demount and maintain, and the upper and lower two blowout preventing facilities can be detached and used individually.

The invention provides a construction method for sudden encounter of untreated karst caves or fractures during shield tunneling. In the shield tunneling process, when the earth silo pressure drops orthe amount of excavated earth decreases, blended thick mud is injected into an earth silo, and then segments with reserved grouting holes are assembled in the tunneling process until shield parametersreturn to be normal, after the assembly is completed, through drilling holes in the segment reserved grouting hole positions in a pressure-loss area of the earth silo, the positions of the karst caves or fractures are detected, and check valves are installed at the hole positions, communicating with the karst caves or fractures, polyurethane slurry is injected, and after grouting is completed, the grouting position is subjected to hole expansion, sleeve valve steel pipes are buried, and cement slurry is injected into the water leakage position; and meanwhile, the ground is monitored at the pressure-loss position of the earth silo, and in areas with large settlement, WSS grouting reinforcement is adopted. According to the construction method, the thick mud is used for treating the karst caves, then the karst cave fractures are plugged by injecting polyurethane and the cement slurry and cooperating with the ground WSS grouting stratum reinforcement, and the problem of shield tunneling encountering untreated karst caves is effectively solved.

The invention provides a comprehensive treatment method for gas and coal spontaneous combustion in near-horizontal thick coal seam mining, and belongs to the technical field of mine gas and coal spontaneous combustion prevention and control. The comprehensive treatment method for gas and coal spontaneous combustion in near-horizontal thick coal seam mining comprises the following steps that gas gushing from a stope face is treated by adopting a two-inlet and one-return-deviation Y-shaped downward ventilation system, an extraction pipe is pre-buried in a connection roadway, and gas gushing fromresidual coal in a goaf is extracted through the extraction pipe; and a grouting pipeline and an air injection pipeline are arranged in an air inlet roadway of the stope face, non-combustible solidified foam is continuously injected into the goaf through the grouting pipeline, and then nitrogen is continuously injected into the goaf through the air injection pipeline. According to the comprehensive treatment method, a three-dimensional prevention and control system for gas and coal spontaneous combustion in near-horizontal thick coal seam mining is constructed, accurate prevention and controlof gas and coal spontaneous combustion coupling disasters are realized, the recovery efficiency of the stope face is improved, and the safety production of a mine is guaranteed.

The invention relates to a method for converter steel tapping alloying molten steel component evening. The method includes that in the process of steel tapping, alloy and carburant are added into molten steel. The alloy is alloying alloy. The method for the converter steel tapping alloying molten steel evening is characterized in that the alloying alloy is added after the carburant is added. According to the method, the problems that in a traditional method, after a converter is tapped, the molten steel enters a steel ladle to lose the self dynamic condition, and molten steel components are not even are solved, so that steel quality is improved.

The invention discloses a shield tunneling machine and a method for controlling the same. The shield tunneling machine comprises a cutter head, a soil bin, a mud feed pipe, a mud discharge pipe, a spiral conveyor, a mud discharge branch pipe and a belt conveyor. The soil bin is arranged on the rear side of the cutter head; a mud feed inlet of the mud feed pipe is communicated with the soil bin and is formed in the upper portion of the soil bin; a mud discharge inlet of the mud discharge pipe is communicated with the soil bin and is formed in the lower portion of the soil bin; an input end of the spiral conveyor extends into the soil bin so that soil in the soil bin can be conveyed out of the soil bin, and the inlet end of the spiral conveyor is positioned below the mud discharge inlet; one end of the mud discharge branch pipe is communicated with an output end of the spiral conveyor, and the other end of the mud discharge branch pipe is communicated with the mud discharge pipe; an end of the belt conveyor is positioned at the output end of the spiral conveyor. The shield tunneling machine and the method have the advantage that the problem of discharge retention due to the fact that residual soil at the bottom of an existing soil bin is settled and gathered and cannot be discharged can be solved.

The invention discloses multi-stage sewage treatment equipment and treatment method for water conservancy projects in the technical field of sewage treatment. The multi-stage sewage treatment equipment comprises a shell, an opening is formed in the top of the shell, and a large garbage filter screen used for filtering large impurities in sewage is fixedly connected to the upper portion of the inner wall of the shell. An adding opening is formed in the position, located below the large garbage filter screen, of the inner wall of the shell, and the adding opening is used for adding a sewage treatment agent into sewage. The middle part of the inner wall of the shell is fixedly connected with a biological sludge filter screen used for filtering biological sludge generated by reaction. The large garbage filter screen and the biological mud filter screen divide the shell into three parts. While sewage is filtered, a conveyor belt is used to drive an arc-shaped scraping plate to intermittently clean sludge and reaction precipitates on the surface of the biological sludge filter screen, so that meshes on the surface of the filter screen cannot be blocked, and the filter screen can keep an optimal filtering effect in the whole sewage filtering process.

The invention relates to an exhaust structure of a steaming household appliance and steaming cooking device. The exhaust structure comprises an inner container with an exhaust port and an exhaust channel with an exhaust air inlet, and an exhaust fan is mounted at an air inlet of the exhaust channel. Theexhaust structure further comprises an air pump, the exhaust port comprises a first exhaust port and a second exhaust port, and the exhaust air inlet comprises a first exhaust air inlet and a second exhaust air inlet. The exhaust channel is provided with an air guide cover at the first exhaust air inlet and the second exhaust air inlet, one end of the air guide cover is provided with an air guide port, and the air guide port faces an air outlet of the exhaust channel, wherein the first exhaust port is in fluid communication with the first exhaust air inlet, the second exhaust port is in fluid communication with a gas inlet of the gas pump, and the gas outlet of the gas pump is in fluid communication with the second exhaust inlet. According to the present invention, the steam circulation at a temperature rising stage can be achieved, the steam utilization rate is increased, the amount of exhausted steam is reduced, and the situation that the high-temperature steam in the inner container rushes out and is directly sprayed to a user when the door is opened when cooking is finished, can be avoided.