160results about How to "Achieve airtightness" patented technology

The invention discloses an auxiliary device for starting and receiving of a shield machine. The auxiliary device comprises a steel sleeve, a bottom framework, and a bearing board, wherein the steel sleeve is formed by connecting a plurality of sleeve bodies, the bottom framework is arranged at the bottom of the steel sleeve, the bottom framework comprises a plurality of sections, the bottom framework comprises a bottom board that extends along a direction vertical to an axis of the steel sleeve, the bearing board extends along the direction vertical to the axis of the steel sleeve and has a side edge matched with the outer side wall of the sleeve body, the bearing board is vertical to the bottom board, lifting boxes are arranged at two ends of the bottom board, the lifting boxes comprise an external box that is formed by connecting a top board parallel to the bottom board with a part of the bearing board and an internal box that is arranged in the external box, the internal box is internally provided with a hydraulic device, and a plurality of vertical and horizontal steel boards are arranged in a clearance between the internal box and the external box so as to divide the clearance into a mesh structure. The auxiliary device can be used for starting and receiving of the shield machine, also can realize cross-station, lifting and translation of the shield machine, is low in device loss and long in service life.

The invention discloses a low pressure molding package structure for a fuel cell, which comprises a shell, an air electrode and a separation film, a hollow fixing piece, and a hot melt adhesive layer. A plurality of air holes are formed on at least one surface of the shell and the periphery of an inner surface of each air hole is provided with a recessed first accommodating part. The air electrode and the separation film are superposed on the inner surfaces of the plurality of air holes. The hollow fixing piece is arranged in the shell, the surface adjacent to the separation film is provided with an annular flange in a projection mode, and a recessed second accommodating part is formed outside the annular flange. The second accommodating part and the first accommodating part enclose to form a C-shaped flow channel. A hot melt adhesive in a melting state is injected from an injection orifice of the shell or the fixing piece in a low pressure molding mode, so that the hot melt adhesive flows in the C-shaped flow channel and closely adheres and coats the edges of the air electrode and the separation film; and when the hot melt adhesive is cooled and cured, a circle of hot melt adhesive layer which has elasticity and adhesiveness and tightly compresses the air electrode is formed so as to block the leakage of the liquid in the cell.

The embodiment of the invention discloses a method for preparing a two-dimensional material. The two-dimensional material is prepared by stripping through a cutting force generated by secondary flow. The method comprises the following steps of selecting a raw material and a dispersing liquid, and preparing a mixed solution in a mixer; selecting a reactor and a power system, and connecting the reactor, the power system and the mixer; and pushing the mixed solution to the reactor, controlling the flow rate and the circulation time in the reactor, and stripping the raw material to prepare the two-dimensional material by rapid flowing of the mixed solution in the reactor and the cutting force generated by the continuous secondary flow formed at a bent plate. The preparation method has the advantages of simplicity in operation process, low cost, high adjustability and high universality and practicability, and is suitably used for various dispersing liquids and raw material systems; and infinite amplification in longitudinal dimension can be achieved during the preparation process, thus, an amplification effect does not exist, industrial production is promoted, and the method can be used for preparation of the two-dimensional material at a large scale.

The invention relates to a gob-side entry retaining method for putting top waste rock down to achieve roadway side packing. The method is mainly applied to the gob-side entry retaining technical field. In the advancing process of a working face, a top coal caving support is directly adopted to put waste rack above a goaf down, the waste rock is transported to the end of the working face and is simply crushed, transferred and transported back, the processed waste rock is stacked, the goaf on one side of a retained roadway is filled with the processed waste rock to form a waste rock wall serving as a roadway side support, and a rear top beam is arranged at the position, needing roadway side packing, of hydraulic supports of the working face, so that a waste rock back transportation device is conveniently installed and the waste rock is stacked to the enough height. Meanwhile, when the waste rock is stacked or after the waste rock is stacked, cemented filling materials are sprayed to the stacking position of the waste rock to achieve airtightness and reinforcement along the roadway side support of the gob-side entry retaining. The method is of great importance in ensuring gob-side entry retaining stability of the thick seam working face, especially the fully mechanized caving face, improving the resource recovery rate and simplifying the roadway side support process.

The invention discloses a method for aluminum ash treatment and recycling use. Through combination of an aluminum ash heat recovery process and an aluminum ash cold recovery process in a current production system and utilization of a dedusting system and multiple waste use processes, the method effectively solves the problem that environmental pollution, resource wasting and a cost are increased, realizes recycling use of treated alumina and fluoride salts, and has obvious economic benefits.

The invention relates to improvement of a pressure gauge verification technology, in particular to a full-automatic pressure gauge verification table and a full-automatic verification method; and thefull-automatic pressure gauge verification table comprises a verification table, a switch, a code scanning device, a camera adjusting mechanism, a camera, a gauge clamping mechanism, a gauge knockingmechanism, a display, a controller and a gas circuit control system; the camera adjusting mechanism comprises a sliding base and a sliding block, the sliding block is in sliding fit with the sliding base, the sliding base is inclined, the camera is installed on the sliding block and faces the gauge clamping mechanism, the gauge knocking mechanism comprises a vertical rod, a telescopic air cylinderand a push rod, the push rod is connected with a telescopic end of the telescopic air cylinder, and a cylinder body of the telescopic air cylinder is installed on the vertical rod. The full-automaticpressure gauge verification table has the advantages of less manual intervention, high automation integration level and high detection accuracy, and can realize the automatic pressure gauge detectionfunction of scanning once, knocking for three times and easily detecting the pressure gauge.

The invention provides a three-dimensional stack structure of a thin-film ceramic circuit. Between two adjacent thin-film ceramic substrates, through ball mounting welding or prefabricated pad welding, stacking of more than three thin-film ceramic circuit substrates is realized. Solid metal through holes are used for realizing electric connection of a random layer. The structure comprises a local electromagnetic self-shielding structure of a chip and/or a passive component. The local electromagnetic self-shielding structure comprises an upper metal layer, a lower metal layer and side surface solid metal through holes. The three-dimensional stack structure can realize stacking of the thin-film ceramic circuit so that an active chip, an RF structure, a high-power structure, a broadband switching structure and the like are integrally integrated in a three-dimensional direction, thereby reducing plan area of a function core by more than 70%, effectively improving product integration level, synchronously realizing hermetic sealing and electromagnetic self-shielding, and improving product adaptability. The three-dimensional stack structure can replace 60-70% of similar products and has advantages of saving cost by more than 60% and improving production efficiency by more than 40%.

The invention discloses a microphone module group which includes a plurality of microphone units, a shell for fixing said microphone units. said microphone units are divided into two units, said shell includes a plastic canister with two microphone units are installed inside the plastic canister and a rubber sleeve coated outside said plastic canister; a common acoustic cavity of two microphone units is set between two microphones inside said plastic canister, a voice channel connected with environment and the common acoustic cavity is set on said plastic canister and rubber sleeve; the microphone module group reduces difficulty that the microphone is fit to microphone array, reaches penetration and airtightness of the voice channel, picks up required voice sign efficiently for forming pickup beam of microphone array, and can prevent acoustic reflection in electronic product.

The invention relates to a layered graphite composite bipolar plate and a preparation method thereof. The layered graphite composite bipolar plate comprises a middle layer and surface layers arrangedat the two sides of the middle layer, the middle layer is a thermoplastic resin/graphite composite material plate, the surface layers are thermosetting resin/graphite composite material layers, and the outer surfaces of the surface layers are provided with flow channel structures. Compared with the prior art, the middle layer is made of the thermoplastic composite material, the feeding precision of the thermosetting composite material is improved in an auxiliary mode in the manufacturing process, and meanwhile the problem that the forming reliability of the thermosetting composite material islow under the high carbon content is solved; in addition, the middle layer with high resin content in the layered polar plate improves the bending strength and air tightness of the bipolar plate, andthe surface layer with high carbon content improves the conductivity of the bipolar plate; the overall performance of the bipolar plate is improved by means of respective optimization of different functional layers, and meanwhile, the preparation process is simple and convenient, is beneficial to batch production, and has a higher practical value.

The invention discloses an axisymmetric air inlet structure of a Hall thruster, relates to the field of spaceflight electric propulsion, and aims to solve the problem that working medium gas is asymmetrically distributed when entering a discharge channel, so that the influence of asymmetrical discharge is caused. A radial buffer chamber sinking groove is formed in the center of the lower portion of a magnetic pole bottom plate of the Hall thruster, and a radial buffer chamber cover plate covers the radial buffer air channel sinking groove to form a closed radial buffer chamber. The top of the magnetic pole bottom plate and the bottom of the discharge channel are provided with a first axial buffer chamber sinking groove and a second axial buffer chamber sinking groove respectively, and a closed axial buffer chamber is formed by combining a sealing ring and a mortise and tenon joint structure. Constructing a gas injection structure at the bottom of the discharge channel; communicating air holes which are uniformly distributed in the circumferential direction are formed in the bottom of the magnetic pole bottom plate and the bottom of the discharge channel to communicate the radial buffer chamber, the axial buffer chamber and the gas injection structure; working medium gas sequentially passes through the gas inlet pipe, the radial buffer chamber, the axial buffer chamber and the gas injection structure and is finally injected into the discharge channel in an axial symmetry mode. The device is used for injecting gas into the discharge channel in an axial symmetry mode.

The invention provides an airtight parallel transmission optical device comprising a silicon substrate, an IC chip, a VCSEL chip, a PD chip, and a lens cover plate. The silicon substrate is provided with a silicon dioxide layer, and is provided with fine through holes, which are filled with conductive substances. The conductive substances are used to communicate the surface layer and the bottom layer of the silicon substrate, and are protruded from the bottom surface of the silicon substrate. The silicon substrate is also provided with a solder layer in a plated manner, and the IC chip is disposed on the silicon substrate in an inverted manner. The VCSEL chip and the PD chip are invertedly disposed on the IC chip in an attached manner. The lens cover plate is provided with an array lens, and is buckled with the silicon substrate by a high-precision image aligning system, and then is integrated with the solder layer by adopting the eutectic fusing technology, and then the lens array can be aligned with the VCSEL chip and the PD chip to realize the optical path coupling, and therefore the airtight packaging technology problem can be solved, the material-saving performance and the energy consumption-saving performance can be achieved, the production can be facilitated, and then the product quality can be improved.

The invention relates to a method for gob-side entry retaining of a medium-thickness coal seam and belongs to the technical field of gob-side entry retaining. The method is characterized in that by taking the advantage of large space of a working face of the medium-thickness coal seam, part of a support of the working face on the gob-side entry retaining side is changed into a top coal caving support and a long tail beam support, and a scraper conveyor, a transfer crusher, a transfer belt conveyor and a downward-spreading conveyor are arranged behind the supports on the working face; and in the working face propelling process, the top coal caving support is directly adopted for conveying gangue above a gob downwards, the downwards-conveyed gangue is downwards spread to the gob area on the gob-side entry retaining side to form a beside-entry support after the procedures of conveying, crushing, transferring and downward spreading, and the whole process is carried out in the gob area. Meanwhile, before the gangue is stacked, flexible protecting plates with holes are adopted for separation in advance so as to adapt to roof settling and prevent the gangue from entering an entry, cementing material filling and reinforcing are carried out, and the flexible protecting plates with the holes can be recycled. The method has important significance to guarantee of the gob-side entry retaining stability, increase of the resource recovery rate and simplifying of a beside-entry support process.

The invention discloses a ceramic bonding pad array shell and belongs to the technical field of ceramic shells of integrated circuits. The ceramic bonding pad array shell comprises a ceramic substrateand a T-shaped heat sink, wherein a cavity with steps is formed in the middle of the ceramic substrate; the upper surface of the heat sink is used for mounting chips; the heat sink is in matched overlap connection with the cavity; and the lower surface of the heat sink is co-planar to the lower surface of a bonding pad arranged on the lower surface of the ceramic substrate. According to the ceramic bonding pad array shell disclosed by the invention, the technical problems existing in the prior art that alignment of ball placement or column placement molds is influenced by the ceramic bondingpad array shell, air convection is influenced and heat dissipation is bad can be solved. The technical effects that alignment of ball placement or column placement molds is not influenced, ball placement or column placement can be performed on the surface of the heat sink and the heat dissipation ability is improved can be achieved.

The invention discloses a portable flour multi-quality detector based on near infrared and a detection method. The detector comprises a case, and a power supply, a light source module, a spectrum acquisition module and a control processing module which are arranged on the case, the light source module comprises a detection accessory, the detection accessory comprises an objective table, a light source seat, a light source cover, a sample reference box, a reflecting cover, an optical fiber collimating mirror, a height adjusting mechanism and a halogen lamp bead; the spectrum acquisition modulecomprises a spectrograph, and the spectrograph is connected with an optical fiber collimating mirror through an optical fiber; the control processing module comprises a circuit board, an embedded computer and a liquid crystal display screen, the embedded computer is connected with the halogen lamp beads through the circuit board, the spectrograph is connected with the embedded computer, and the embedded computer is connected with the liquid crystal display screen. The detector is compact in structure, complete in function, light, handy, portable, high in universality, capable of moving everywhere, simple in detection method, capable of effectively detecting whether the moisture value and the DON value of a sample exceed the standard or not and high in detection precision.

The invention discloses a Ka/Ku dual-frequency BUC of an integrated design. The BUC includes an intermediate-frequency signal and reference signal shared input port, two radio frequency output ports,a power input port and a low-frequency control signal input port. The Ka/Ku dual-frequency BUC is integrated with frequency up-conversion units and power amplification units on two frequency bands ofKa and Ku. The frequency up-conversion units and the power amplification units realize switching through a control terminal, and have a shared heat dissipation unit, power supply unit and monitoring unit at the same time. The intermediate-frequency input end of the dual-frequency BUC receives a signal, the Ka frequency band or the Ku frequency band is selected through the control terminal, power amplification is carried out on the selected frequency band, and the same is sent to an antenna. According to the small-volume Ka/Ku dual-frequency BUC of the invention, dual-frequency integrated alternate working can be carried out to ensure that a commercial aircraft flies in global airspace across different regions and different satellite communication frequency bands, and arbitrary switching and real-time communication can be realized.

The invention discloses an air conditioning unit for an EMU multiple unit train and belongs to the technical field of air conditioning equipment of rail vehicles. The air conditioning unit comprises an air conditioning unit body which is characterized in that a first sealing assembly is arranged between an air port in the bottom of the air conditioning unit body and the top of a car; the first sealing assembly comprises a first annular sealing flange arranged at the outer edge of the air port and a first sealing rubber strip arranged in an annular groove of the first annular sealing flange. The air conditioning unit disclosed by the invention has the beneficial effects that 1, the sealing flange at the air port and the car is a bended formed metal sheet part, so that an existing section bar is replaced and a die opening cost is cancelled while the sealing effect is guaranteed, and meanwhile, a design scheme is modified favorably, and the design cost and the product cost are reduced greatly; and 2, the air port and the car are of a double-layered sealing structure, and meanwhile, the double-layered sealing structure is of a labyrinth seal, so that the sealing property of the positions of the air ports is guaranteed, and the airtightness of the unit is achieved by means of a pressure wave protecting valve arranged in the unit.

The invention provides a high-temperature material sucking and discharging truck for sucking high-temperature materials by negative pressure and discharging the high-temperature materials by positive pressure. The high-temperature material sucking and discharging truck comprises a high temperature resistant truck chassis, wherein a vacuum pump and a material tank are mounted on the truck chassis; the material tank is connected with an air compressor; a material sucking hole and a tail gate discharging device are mounted at the bottom of the material tank; an air filtering device is mounted in the material tank, fixed at the material sucking hole at the bottom of the material tank, sealed with the material tank and connected with a fine filtering and dust removal chamber outside the material tank through an air pipeline; the fine filtering and dust removal chamber is connected with a metal filter through the air pipeline; the metal filter is connected with a silencer and the vacuum pump through the air pipeline; the air filtering device adopts a sheet-shaped porous ceramic filter; and a filter pipe is also mounted in the fine filtering and dust removal chamber and adopts a tubular porous ceramic filter. According to the high-temperature material sucking and discharging truck, the high-temperature deformation of the filter and the pipeline can be prevented for avoiding the adhesion phenomenon, and the materials can be sucked by the negative pressure and discharged by the positive pressure.

The invention discloses a cooking control method used for a cooking utensil. The cooking utensil comprises a cooker body, an inner pot, a cover, a top temperature sensor, a pressure valve opening andclosing mechanism and a control device, wherein the control device can maintain the pressure in the cooking space to be the constant pressure P. The cooking control method comprises the following steps: S1, heating the inner pot by adopting an inner pot heating device; S2, when the temperature of the top of the inner pot is kept constant at the first preset temperature T1 within the preset time, controlling the pressure valve opening and closing mechanism to be closed through the control device; and S3, controlling the inner pot heating device to carry out further heating till the temperatureon the top of the inner pot achieves the second preset temperature T2, wherein T2=T1+P/dalta p, and dalta p refers to the pressure change value in the cooking space when the temperature on the top ofthe inner pot increases by unit temperature under the condition that the cooking space is under the closed state. Through the cooking control method provided by the invention, by utilizing the top temperature sensor, the cooking utensil can have the preset constant pressure in an area with any altitude.

The invention discloses a space extensible aircraft transformable nose cone provided with nested segmented housings. The space extensible aircraft transformable nose cone is composed of the nested segmented nose cone housings, cross bars and a transmission mechanism of the cross bars, a parallel guide rail rotating mechanism, and a motor screw rod and nut driving device; in whole body deflection and stretching motion process, the mutual nesting of segments of the nested segmented housings can be maintained, the line contact of adjacent nose cone housings is ensured, and the special shape characteristic of the nested segmented housings is capable of improving the nose cone sealing performance greatly, and the reliability of the transformable nose cone is improved. A space extensible structure with a motion freedom of 2 is formed by the nested segmented housings, the cross bar mechanism, and the parallel guide rail rotating mechanism on the side surface; the adoption of the transmissionmechanism is capable of realizing integral body linkage of the segmented housings. The space extensible aircraft transformable nose cone is flexible in transformation, lower in driving, small in nosecone occupied space, and stable in transformation.

The invention discloses an airtight platform anchoring device. The device comprises a base, a ring seat, a PU temporary clamp, a backing plate, a pressure plate and a cover. The base shape is matchedwith a platform top flange and is detachably fixed to the upper side of the platform top flange, the ring seat is detachably fixed to the upper side of the base, a truncated-type through hole matchedwith the shape of the PU temporary clamp is formed in the ring seat, the outer side of the PU temporary clamp is a truncated type and is arranged in the through hole of the ring seat, the backing plate is disposed on the upper portion of the PU temporary clamp, the backing plate is detachably fixed to the ring seat, the pressure plate is disposed on the upper side of the backing plate and is detachably fixed to the backing plate and the ring seat, the cover is disposed outside the ring seat, the backing plate and the pressure plate, and the lower end of the cover is fixed to the upper side ofthe base. The device integrates the temporary clamp into the platform anchoring device, and not only achieves the temporary fixing effect of the lightweight temporary clamp on a submarine cable, but also achieves the airtightness of the inside of platform anchoring.