719results about How to "Smooth connection" patented technology

The invention relates to the technical field of artificial intelligence, and discloses a man-machine dialogue history and semantic retrieval-based prompt automatic construction method, which comprises the following steps of S1, performing text preprocessing on historical dialogue data and user input, including dynamically generating query keywords, verifying and analyzing a file uploaded by a user, and extracting core contents; s2, utilizing a pre-training language model to map the historical dialogue and the user request into semantic vectors, matching in combination with the keyword weight, and constructing a historical vector set and a user request vector; and S3, extracting a context fragment most relevant to the user request from the historical dialogue vector based on a convex optimization method. The context information highly related to the user request is accurately extracted through the sparse optimization technology, and the background information, the user request and the generation instruction are organically integrated in combination with the dynamic Prompt template design, so that the semantic correlation and context coherence of the generated reply are improved, and the interference of redundancy and irrelevant information is avoided.

The invention belongs to the technical field of waste resource recycling, and particularly relates to a waste resource recycling plastic product manufacturing and forming device which comprises a base, an injection mechanism used for plastic plasticizing and moving is arranged at the top of the base, and a first feeding hopper is arranged at the top of the injection mechanism; a mold closing mechanism connected with a discharging port of the injection mechanism is arranged at the top of the base and used for conducting pressing molding on molten plastic, a treatment box is arranged at the position, located on one side of the injection mechanism, of the top of the base, and a smashing mechanism used for smashing waste resources is arranged in the treatment box; the two driving crushing cutters are driven by the first motor to synchronously and relatively rotate, and then are matched with the fixed crushing cutter to crush waste plastics; according to the waste plastic crushing and cleaning device, multiple functions of crushing, screening, cleaning, drying and the like can be ingeniously integrated, the crushing effect and efficiency of waste plastic are improved, and the powder cleaning effect and the powder quality are also improved.

The invention belongs to the technical field of yarn production detection and image processing, and discloses a lightweight yarn defect detection method based on an improved YOLOv8n network, which comprises the following steps: collecting yarn pictures on a production line, preprocessing the collected pictures, inputting the preprocessed pictures into a DGL-YOLO network trained offline, and outputting yarn defect detection pictures with abnormal positions and types. The DGL-YOLO network is based on a YOLOv8n network, a CBS module except the first two CBS modules in the Backbone and a CBS module in the Neck are all replaced by a DMAConv module, and a C2f module in the Backbone and a C2f module in the Neck are all replaced by a C2f-GhostDynamicConv module. The detection method provided by the invention has high confidence coefficient in yarn abnormity identification, and is suitable for being deployed on mobile equipment of a yarn production line to complete a task of real-time yarn detection.

The invention provides an air bubble film bag production line and a method thereof, and relates to the technical field of air bubble film production equipment.The air bubble film bag production line comprises an air bubble film production assembly, a first buffering assembly, a second buffering assembly, a before-folding transition assembly, a folding assembly and a pressing and cutting assembly which are sequentially connected; the bubble film production assembly comprises a bubble forming part, the bubble forming part comprises a bubble roller body, a water through hole is formed in the center of the bubble roller body, and a plurality of vent holes are formed in the circumference of the bubble roller body. The air bubble film production device has the beneficial effects that the air bubble film production assembly is linked with the folding assembly and the pressing and cutting assembly, air bubble films produced by the air bubble film production assembly can be input into the folding assembly and the pressing and cutting assembly in diameter for production of air bubble film bags, and the situation that the air bubble films are rolled into packages is avoided; and the rolled air bubble film is mounted on the air bubble film bag production equipment, so that the production efficiency of the air bubble film bags is greatly improved, and human resources of a production workshop are saved.

The invention relates to the field of metallurgical machining, and particularly discloses powder metallurgy pressure forming equipment and a forming method.The powder metallurgy pressure forming equipment comprises a bearing plate, a machining groove is formed in the bearing plate, and a pressure mechanism matched with the machining groove is arranged on the bearing plate; a containing box for containing metal powder is arranged on the bearing plate, a releasing assembly is arranged on the containing box, and the releasing assembly is used for releasing the powder in the containing box into the machining groove. In the pressurizing process, the movement of the containing box and the release action of powder are achieved, it is guaranteed that the powder in the containing box does not fall off, coordinated operation of the containing box and the release assembly is achieved, powder pressurizing forming is completed, in the machining process, continuity of the working procedures is achieved, connection of the working procedures is improved, connection of the working procedures is smooth, and the machining efficiency is improved. No procedure action waiting time exists, the machining time is shortened, the production efficiency is improved, the enterprise cost is reduced, and the market competition of enterprises is facilitated.

The invention relates to the technical field of hydraulic pressure, and discloses an oil cylinder for an oil press, a hydraulic system of the oil cylinder and a pressurizing method, a protection frame is additionally arranged outside the oil cylinder, vibration under the working condition of high-speed movement or extreme pressure can be reduced, and the oil cylinder is prevented from being damaged or deformed; the multi-pump system transmits hydraulic oil of a hydraulic oil tank to the lifting module through an oil supply pipeline, the lifting module conducts overflow pressure stabilization on the hydraulic oil and then transmits the hydraulic oil to the station oil cylinder, and therefore the station oil cylinder stretches out and draws back to adjust the position of the oil press. The multi-pump system transmits hydraulic oil of a hydraulic oil tank to an energy accumulator for pressurization through a pressurization pipeline, pressure regulation is conducted through a pressure regulation one-way throttle valve, then pressure stabilization is conducted through a pressure regulation piezoelectric hydraulic reversing valve and a pressure regulation hydraulic control one-way valve, and finally the hydraulic oil flows into a light-pressure station oil cylinder or a heavy-pressure station oil cylinder through the pressurization pipeline. Therefore, the hydraulic pressure output of the oil press is improved, the same oil press can process various different work tasks, and the universality and adaptability of equipment are improved.

The invention provides a zirconium boride / graphene complex-phase wear-resistant and high-temperature-resistant ceramic material and a preparation method thereof, and belongs to the technical field of ceramics. The preparation method comprises the following steps: pretreating graphene, preparing titanium dioxide / graphene microspheres, modifying the titanium dioxide / graphene microspheres, functionalizing the titanium dioxide / graphene microspheres, preparing a ceramic mixture, molding and sintering. The step of functionalizing the titanium dioxide / graphene microspheres comprises the following steps: putting the modified titanium dioxide / graphene microspheres into xylene, adding bisphenol A epoxy resin and triphenylphosphine, raising the temperature, carrying out stirring reaction, filtering out, washing, putting into N, N-dimethylformamide, uniformly stirring, adding gallic acid and p-toluenesulfonic acid, and carrying out ultrasonic treatment to obtain the titanium dioxide / graphene microspheres. Raising the temperature for reaction, filtering, washing and drying after the reaction is finished, so as to prepare functionalized titanium dioxide / graphene microspheres; the prepared ceramic material is high in strength, good in wear resistance and excellent in high temperature resistance.

The invention discloses a prototype-based federated medicine multi-modal Hash retrieval method, system and equipment and a medium, belongs to the technical field of federated learning and multi-modal Hash retrieval, and aims to solve the technical problem of how to effectively guarantee the privacy and security of medical data in a multi-modal Hash retrieval process. The technical scheme adopted by the invention is as follows: the method comprises the following steps of: constructing a medical multi-modal data set; constructing a federal medicine multi-modal Hash retrieval model based on the prototype: constructing the federal medicine multi-modal Hash retrieval model based on the prototype by utilizing a neural network and a deep learning technology; model training: training a federal medicine multi-modal Hash retrieval model based on a prototype by utilizing the final data set; the method for constructing the federal medicine multi-modal Hash retrieval model based on the prototype comprises the following specific steps: performing medical multi-modal fusion; carrying out prototype parameter reinforcement learning; a hash retrieve query.

The invention discloses an industrial wastewater treatment process, and belongs to the technical field of wastewater treatment.The industrial wastewater treatment process comprises the following steps that firstly, the pH value of wastewater is adjusted to be smaller than 5, microelectrolysis filler is added, and pretreated wastewater is obtained through stirring, standing and filtering; 2, carrying out Fenton oxidation treatment on the pretreated wastewater; according to the method, an iron-carbon micro-electrolysis-Fenton oxidation combined mode is adopted for treating the wastewater, the COD removal rate is high, granular iron-carbon filler (micro-electrolysis filler) used in the iron-carbon micro-electrolysis process has stable physical and chemical properties, and the long-term and efficient treatment effect can be guaranteed; according to the micro-electrolysis filler, the boron-nitrogen-doped carbon material is used for replacing a conventional carbon material, so that the treatment efficiency of the granular iron-carbon filler is improved, the treatment process can be better linked with a Fenton oxidation treatment process, and industrial treatment is facilitated.

The invention provides an optical fiber penetration piece which comprises a penetration main piece, the penetration main piece is used for penetrating through an equipment shell, the penetration main piece is of a hollow structure with two open ends, the two open ends of the penetration main piece are respectively provided with a sealing assembly, and the sealing assemblies are provided with a plurality of through holes for armored optical fibers to pass through. The armored optical fiber comprises an optical fiber body and a protective sleeve, the optical fiber body is metalized, the protective sleeve is of a gold-plated structure, and the metalized optical fiber body is welded and connected with the gold-plated protective sleeve at the two ends of the protective sleeve through tin-antimony solder or tin-gold solder. The tin-antimony solder or the tin-gold solder has relatively low welding temperature, so that thermal damage to the optical fiber body can be reduced, the optical fiber body is prevented from being damaged due to overheating, and continuity and high quality of signal transmission are maintained; meanwhile, the tin-antimony solder or the tin-gold solder has good flowability and wettability and can be uniformly distributed at the connecting part of the optical fiber body and the protective sleeve, so that damage to the optical fiber body caused by local stress concentration is avoided.

The invention relates to a multichannel PCM data real-time acquisition and output system and method based on an ALSA framework, and the system comprises a multichannel analog quantity input unit and a multichannel analog quantity output unit, and also comprises a system configuration unit, a memory resource unit, an AD acquisition conversion unit, an audio routing unit, a DA output conversion unit and an ALSA DMA cache region distribution unit. The ALSA DMA cache region allocation unit is used for building a PCM data path of a user space and a kernel space and providing an annular cache region queue for storing DMA resource descriptors, and the audio routing unit obtains the returned DMA resource descriptors from the ALSA DMA cache region allocation unit and allocates the DMA resource descriptors to an output end to complete synchronous multichannel input and output of PCM data. According to the system provided by the invention, the ALSA DMA buffer area distribution unit is adopted, so that the DMA configuration process is simplified, and the data transmission efficiency is improved.

The invention discloses a passable area detection method based on multi-sensor feature level fusion, and the method comprises the following steps: collecting radar point cloud data and RGB image data of a plurality of driving areas through employing a laser radar and a vehicle-mounted camera, and constructing an original data set; constructing a depth map based on the collected radar point cloud data; constructing a training data set based on the RGB image and the depth map; constructing a passable area detection model, and training the model by using the training data set; and 4, executing the step 1 and the step 2 for a to-be-detected driving area, then detecting the to-be-detected driving area by using the passable area detection model trained in the step 4, and identifying the passable area in the to-be-detected driving area. According to the passable area detection method, the detection performance of the model can be improved, the capturing capability of the model on data details is enhanced, and then the detection precision of the passable area is improved.

The invention relates to the technical field of medical image intelligent analysis systems, in particular to a mammary gland molybdenum target image intelligent analysis system and method based on multi-scale deep learning, and the system comprises an image obtaining module which is used for obtaining a mammary gland molybdenum target image; the calcification detection module is connected with the image acquisition module, and is used for carrying out intelligent detection on calcification points in the mammary gland molybdenum target image based on the multi-dimensional feature matrix and the adaptive feature filter, and generating confidence scores and dynamic segmentation thresholds of the calcification points; the calcification segmentation module is connected with the calcification detection module and is used for segmenting the calcification point region based on the dynamic segmentation threshold value of the calcification detection module; the calcification quantification module is connected with the calcification segmentation module and is used for extracting quantitative features of the calcification points based on the segmentation result of the calcification segmentation module, and by introducing feature extraction and feature fusion of different scales, the sensitivity to tiny calcification points is remarkably improved; and meanwhile, the problem that a traditional single-scale model cannot accurately identify calcification characteristics of different scales is solved.

The embodiment of the invention provides a feed device, an antenna system and a base station, the feed device comprises a substrate, the substrate comprises a signal line, and the signal line is used for transmitting an electric signal; the shell is arranged on the substrate, the shell comprises a bottom wall and side walls, and a plurality of cavities are defined by the side walls and the bottom wall; and the plurality of functional circuits are respectively accommodated in the plurality of cavities, the plane where the plurality of functional circuits are located is perpendicular to the substrate, and the plurality of functional circuits are connected with the signal lines through strip lines. According to the feed device, the antenna system and the base station provided by the embodiment of the invention, the feed device can be easily integrated with different functional modules of the antenna system, and the flexible layout of the antenna system is realized.

The invention belongs to the technical field of dressing production equipment, and discloses dressing processing equipment. The dressing processing equipment comprises a rack, a discharging mechanism, a punching device, a slitting device and a collecting mechanism, the discharging mechanism, the punching device, the slitting device and the collecting mechanism are all arranged on the rack, the discharging mechanism is configured to unwind a material belt, the punching device is configured to punch holes in the material belt, the slitting device is configured to cut the material belt into at least two pieces in the width direction, and the collecting mechanism is configured to receive the material belt. And the material receiving mechanism is configured to wind the cut material belts respectively. According to the dressing processing equipment, punching and slitting can be achieved on the same dressing processing equipment, in the whole processing process, only a material belt needs to be placed and wound once, it can be ensured that the punching area is correct only by adjusting the position of the material belt once, a wide-width material belt is slit into a needed narrow-width material belt, the whole process is simple in procedure, and the production efficiency is improved. All links are smoothly connected, so that the production efficiency is improved, and the production cost and the time cost are reduced.

The invention relates to a coconut shred vegetation blanket protection revetment and a construction method thereof.The coconut shred vegetation blanket protection revetment comprises a plurality of coconut shred vegetation blankets arranged on a side slope of a river or a mountain or a terrace, the coconut shred vegetation blankets are sequentially arranged in a lap joint mode in the extension direction of the side slope, and the coconut shred vegetation blankets are anchored to the side slope through anchoring parts; a seed layer is scattered on the coconut shred vegetation blanket, a layer of planting soil covers the seed layer, and a seed layer is scattered on the surface of the planting soil. According to the method, flexible slope protection can be conducted on slopes of roads, railways and river channels, construction is rapid, the soil fixation effect is good, the method and roadbed construction can be conducted at the same time, the soil fixation and slope protection effects are achieved through different plant communities, the construction cost is much lower than that of a traditional method, and the later maintenance cost is almost zero. The coconut shred vegetation blanket can be applied to various urban landscaping, the construction speed is high, the survival rate is high, selectivity is high, a large amount of water is not needed, the current situation of water use is fundamentally solved, and a large amount of cost is saved.

The utility model provides a water purification floating bed for cress planting, which relates to the field of agricultural planting and comprises a plurality of floating bed bodies, a plurality of connecting pipes, a plurality of socketed pipes and a frame, each floating bed body is symmetrically provided with four potted plant mounting holes and four connecting corners, and the connecting corners are connected with the frame. Fixing holes are formed in the middles of the connecting corners, cavities are formed in the floating bed body, the multiple connecting pipes and the multiple socketed pipes are fixedly communicated with the floating bed body and the two sides of the frame respectively, and the socketed pipes are matched with the connecting pipes. By arranging the connecting pipes, the socketed pipes, the connecting corners, the fixing holes and the water level adjusting assemblies, under the condition that the connecting pipes are connected with the socketed pipes, communication between a plurality of floating bed bodies can be facilitated, communication between the floating bed bodies and the frame can also be facilitated, and then binding belts and the fixing holes among the floating bed bodies are used for binding; therefore, the floating bed structure is more convenient to disassemble and assemble.

A movable feeding device of a lime double-hearth shaft kiln comprises an integral moving trolley, a moving trolley guide rail, a combined portal frame, a rotary hopper supporting ring beam, a hopper supporting structure, a hopper rotation driving mechanism, a rotary hopper and a charging bell, the integral moving trolley walks on the moving trolley guide rail in a reciprocating mode, and the rotary hopper supporting ring beam is installed on the integral moving trolley. A hopper supporting structure and a hopper rotation driving mechanism are arranged on the rotary hopper supporting ring beam, the rotary hopper is erected on the hopper supporting structure and driven by the hopper rotation driving mechanism to rotate, the combined portal is fixedly connected with the rotary hopper supporting ring beam, and a charging bell lifting driving device is installed on the combined portal. The charging bell is arranged at a discharging opening in the bottom of the rotary hopper, a lifting shaft protection sleeve is arranged in the middle of the rotary hopper, and a transmission mechanism of the charging bell is connected into the lifting shaft protection sleeve in a penetrating mode. According to the utility model, two-way movable feeding of the kiln top can be realized, limestone materials are uniformly heated, the operation process is environment-friendly, and the operation is safe.

The utility model relates to a device for improving band steel packing efficiency, which is matched with a band steel coil and a packing band coil for use and comprises a bearing frame, a storage frame and a bearing frame base, the bearing frame is of an inverted trapezoidal structure, positioning shafts are arranged in the middles of two side walls of the bearing frame, the two positioning shafts are in bolted connection with the storage frame, a pin penetrating frame is arranged on the bearing frame, and a roll shaft is arranged at the bottom of the bearing frame. Before use, the center line of the bearing frame in the length direction and the center line of the strip steel need to be guaranteed to be on the same vertical horizontal line, the problem that operation inconvenience is caused by the fact that a whole roll of packing belt is long and the packing belt roll topples over during operation is solved, meanwhile, the packing belt does not need to be cut in advance, the operation time is shortened, and the production efficiency is improved. The packing belt cutting device is simple in structure, safe, reliable, convenient to operate and maintain in the later period, and capable of effectively overcoming the defect that in the prior art, time and labor are wasted when packing belts are cut.

The invention discloses an anti-ultraviolet automobile film and a preparation method thereof, and belongs to the technical field of automobile films. The invention relates to a high-temperature-resistant coating which comprises the following components in parts by weight: 80-100 parts of polyethylene glycol terephthalate, 3-5 parts of polyimide, 5-8 parts of a plasticizer, 2-3 parts of a defoaming agent, 1-2 parts of a flatting agent and 20-30 parts of TiO2 / PDA / ZnO (at) MOF. TiO2 is wrapped by polydopamine, agglomeration of TiO2 is prevented, meanwhile, ZnO is wrapped on the outer layer more uniformly due to the adsorption effect on ZnO, and polydopamine also has the antibacterial and light absorption effects; the combination of TiO2 and ZnO can effectively improve the breadth and depth of ultraviolet protection. The prepared automobile film has high transmittance and ultraviolet absorptivity, and a pencil hardness test table has good mechanical properties and good antibacterial rate.

The invention relates to the field of batteries, and provides a battery clamp and a preparation method thereof. The battery clamp comprises a first clamping plate, and a first clamping groove is formed in the first clamping plate; a second clamping groove is formed in the second clamping plate, and under the condition that the first clamping plate is installed on the second clamping plate, the first clamping groove and the second clamping groove form a clamping space used for clamping the outer circle face of the battery; the telescopic supporting rod is connected to the first clamping plate or the second clamping plate. The battery clamp can effectively clamp the outer circular surface of the battery and prevent the battery from moving or sliding off in the operation process, so that the stability and the safety of operation are ensured. And the design of the clamping groove fully considers the protection of the battery, so that the damage to the battery caused by too large clamping force of a traditional clamp is avoided, the service life of the battery is prolonged, and the maintenance cost is reduced.

The invention belongs to but is not limited to the technical field of gas concentration monitoring, and discloses a dry-type transformer fault characteristic gas detection device and method, and the device comprises a sensor module, a power supply module, and a central control module. The sensor module comprises a gas sensor and a circuit module matched with the gas sensor, and is used for collecting gas concentration data in real time by utilizing the gas sensor and transmitting the gas concentration data to the central control module; and the power supply module is composed of a power supply module, a voltage conversion module and a peripheral module and is used for providing stable power supply support for the whole system and managing communication and function integration among the components. The system is suitable for various environment monitoring requirements such as laboratories, industrial places and warehouses, the safety management level can be effectively improved, and it is ensured that the concentration change of harmful gas in the environment can be reflected in time.

The invention belongs to the field of basalt fiber photovoltaic supports, and discloses an energy-consuming basalt fiber photovoltaic support without trepanning connection, which is characterized in that a plurality of groups of energy-consuming connecting pieces are arranged on a stand column, and each energy-consuming connecting piece comprises a buckle, an energy-consuming assembly and a pre-embedded connecting steel plate; the buckle is used for fixing the basalt fiber supporting structure and providing stable inclined supporting force and vertical supporting force for the basalt fiber purline; the energy dissipation assembly consumes external load energy through friction, and the anti-seismic and wind-resistant performance of the support is enhanced; the whole support is connected without opening holes, stress is effectively dispersed, local stress concentration is avoided, and the material performance is kept; the energy dissipation assembly enables the support to be in rigid connection under the load and then to be in flexible connection, energy is consumed, load transmission is limited, and rod pieces are prevented from falling off and cracking. By adopting the bracket, the problems of mechanical property reduction and stability caused by trepanning are solved, the durability and the safety of the bracket are remarkably improved, and the bracket is widely applicable to different geographical and climatic conditions.

The invention relates to the technical field of transportation equipment, in particular to an automatic stacking device which comprises a tray collecting and delivering module, a tray centering module, a grabbing module and a tray steering module. The tray collecting and delivering module is used for delivering the collected trays to a conveying line; the tray centering module is used for centering each tray sent by the tray collecting and sending module on a conveying line; the grabbing module is used for grabbing goods to the centered tray; the tray steering module is used for steering the transportation direction of a tray loaded with goods; and the turned tray is transported to the shaping table, and the shaping table is used for adjusting the placing position of the goods on the tray. The structural design of each process module is compact, the overall occupied area is small, operation is flexible, and the transportation efficiency is high.

The embodiment of the invention relates to the technical field of industrial buildings or building groups, in particular to an arrangement structure of a nuclear power plant with double reactors, which comprises a main plant area, a fuel production and treatment area, a cooling water facility area, a power distribution device area, a radioactive auxiliary production area, a non-radioactive auxiliary production area, a pre-plant building area and an ancillary facility area, the main plant area comprises a nuclear island area and a conventional island area, the nuclear island area is arranged in the center of the nuclear power plant, a first reactor and a second reactor are arranged in the nuclear island area and are adjacently arranged, and the first reactor is arranged on the north side of the second reactor. According to the arrangement structure, the same plant area has the functions of power generation, fuel production and fuel treatment, double-reactor sharing of all the functional areas is achieved, in addition, the coordination of the overall layout of the nuclear power plant is considered, compact and reasonable general plane arrangement is conducted on the nuclear power plant, connection and transition between all the functional areas are optimized, and therefore double reactors can be better served.

The utility model belongs to the technical field of fixing mechanisms, particularly relates to a fixing device for a membrane type oxygenator, and provides the following scheme aiming at the problems that the existing fixing device is difficult to fix, a tube is separated, the membrane type oxygenator is easy to fall off, and the membrane type oxygenator needs to be fixed by two persons and is inconvenient to use, the fixing device comprises a connecting rod; a limiting ring is arranged at the side end of the connecting rod, the supporting ring is arranged in the limiting ring and used for supporting the membrane type oxygenator to be fixed, a set of connecting assemblies are arranged between the limiting ring and the supporting ring, and the connecting assemblies are used for disassembling the supporting ring; a fixing block is arranged at the side end of the connecting rod, and the clamping and positioning assembly is arranged in the fixing block and used for clamping and positioning the membrane oxygenator; the membrane type oxygenator fixing device can effectively and quickly fix a membrane type oxygenator, is convenient for a single person to operate, can replace a new supporting ring through a connecting assembly, can adapt to supporting of membrane type oxygenators with different sizes, and is convenient to use.

According to the technical scheme, the die mounting device capable of adjusting the wall thickness of the seamless pipe is characterized in that a first spherical groove is formed in the center of a fixed base, a movable base matched with the first spherical groove is arranged in the first spherical groove, an annular groove is formed in the center of the movable base, a stretching die is arranged in the annular groove, and a moving core matched with the stretching die is arranged in the stretching die; a gap is reserved between the drawing die and the movable core, a pipe inlet is formed in one end of the drawing die, and pressing plates are arranged on the two sides of one end of the pipe inlet respectively and are in threaded connection with the movable base. A positioning block is arranged above the edge of the first spherical groove, a threaded hole is formed in one end of the positioning block, an adjusting bolt penetrates through the threaded hole and then is inserted into the threaded groove, and an arc protrusion matched with the second spherical groove is arranged at the other end of the positioning block. The utility model has the beneficial effects that the contact surface of the movable base and the fixed base is designed to be a spherical surface, so that the range of the adjustable angle of the movable base is expanded; the stability of the device is improved under the premise that the angle adjustment is not affected through the arc protrusions.

The utility model relates to a flame-retardant sound-absorbing module which is provided with a frame and a sound-absorbing assembly. The upper end of the frame is detachably fixed to a wall through the connecting assembly, the sound absorption assembly is arranged in the frame, and the lower end of the frame is detachably covered with flame-retardant cloth. The connecting assembly comprises a connecting block, a lifting rope with one end fixedly arranged on the connecting block and a clamping block fixedly arranged at the other end of the connecting block, the other end of the lifting rope is fixedly arranged on an external wall, and a sliding groove which extends in the extending direction of the frame and allows the clamping block to slide in the sliding groove to form sliding fit is formed in the upper end of the frame. The two ends of the sliding groove communicate with the outside, a limiting plate used for limiting the clamping block in the sliding groove is arranged at a groove opening of the sliding groove, and the upper end of the frame is detachably and fixedly arranged on a wall through sliding fit between the clamping block and the sliding groove and limitation of the limiting plate on the clamping block. According to the utility model, packages and internal materials can be conveniently replaced, and meanwhile, the packaging box is convenient to mount and dismount.

The invention provides an ionic liquid catalyst and a preparation method thereof, methyl methyl carbamate and a preparation method, a preparation system and application thereof. The structural formula of the ionic liquid catalyst is [Zn (CH3NHC (O) OCH3) 2] < 2 + >. 2 (CH2COO)-. According to the invention, urea, methanol and dimethyl carbonate are used as raw materials, and methyl carbamate is prepared under the catalytic action of the ionic liquid catalyst. Methanol, dimethyl carbonate and urea are subjected to multi-step alcoholysis reaction and ammonolysis reaction, the target product selectivity is high, the raw material conversion rate is high, the methyl methyl carbamate product purity is high, no organic tin residues exist, and the catalyst cost is low.

The utility model discloses a simulation device for a control panel of an aircraft landing gear. The simulation device comprises a landing gear operation instruction simulation device unit and a landing gear folding and unfolding operation simulation device unit which are arranged side by side and connected through a data line, the undercarriage operation indication simulation device unit is mainly used for indicating testing and locking of aircraft states and operation actions related to the undercarriage, and the undercarriage folding and unfolding operation simulation device unit is mainly used for folding and unfolding the undercarriage. According to the utility model, the electronic circuit structure composed of the switch, the knob and the indicating lamp and the physical structure of the operating rod are utilized to simulate the operation function of the undercarriage control panel on the left console of the trafficker type, thereby simplifying the physical structure operation parts of the real machine. The use experience basically indifferent from real machine display and operation is provided for a user, and the manufacturing cost of the device is reduced.