116results about How to "Reduced mechanical properties" patented technology

The invention provides an ultra-high-speed electric connector which comprises an insulating body, the insulating body is provided with a lengthwise slot, a plurality of terminal slots are formed in lengthwise side walls on the two sides of the slot respectively, and a fool-proof part is arranged in the slot and used for dividing the insulating body into a power supply and low-speed signal area and a high-speed signal area which are located on the two sides of the fool-proof part; the plurality of terminals comprise differential signal terminals distributed in the high-speed signal area and other terminals distributed in the high-speed signal area and the power supply and low-speed signal area, every two differential signal terminals are adjacent, and two sides of every two adjacent differential signal terminals are respectively provided with a grounding terminal; every two adjacent differential signal terminals and two grounding terminals located on the two sides of the two differential signal terminals form a terminal module, and the two differential signal terminals and the two grounding terminals of each terminal module and an insulating block inserted into the insulating body are formed in an embedded mode. The ultra-high-speed electric connector can enable signal transmission to be better and more stable.

The invention provides a passenger vehicle door anti-pinch control method and system based on visual identification. Belongs to the technical field of intelligent traffic and vehicle safety control. The method comprises the following steps: acquiring a vehicle door area video picture through a video acquisition module, and generating vehicle door area original video data; performing video preprocessing according to the original video data of the vehicle door area to generate preprocessed video data; inputting the preprocessed video data into a target recognition module, recognizing a human body or a carried object target, and generating target recognition data; performing target feature extraction according to the target identification data to generate target feature data; according to the passenger-carrying vehicle door anti-pinch control method based on visual identification, the response speed of vehicle door anti-pinch is increased, a response can be made immediately when a target just enters a dangerous area, and potential safety hazards caused by response lag are reduced.

The utility model discloses a turnover structure and an earphone box, the turnover structure comprises a first hinge seat and a second hinge seat, and the first hinge seat is provided with a first channel communicated with an inner cavity of a box body; the second hinge seat is rotationally connected with the first hinge seat, and the second hinge seat rotates to drive the box cover to close or open the box body; the second hinge seat is provided with a second channel, and the second channel and the first channel are used for allowing a flexible conductive structure for connecting the box cover and the box body to sequentially penetrate through; the second channel is provided with a first end and a second end, the first end is communicated with the inner cavity of the box cover, and the projection of the second end in the extending direction of the first channel is located in the boundary of the cross section of the first channel in the rotating stroke of the second hinge seat. According to the utility model, the flexible conductive structure can form a gentle bending structure instead of forming a sharp break angle according to the space of the first channel and the stress condition of the flexible conductive structure. The condition of stress concentration is avoided, and the probability of mechanical fatigue or fracture damage of the flexible conductive structure is reduced.

The utility model relates to the technical field of plastic pulley production, and disclose a kind of feeding device for plastic pulley production, including bottom plate, first mounting bracket and second mounting bracket are arranged on bottom plate, supporting frame is arranged on second mounting bracket, supporting frame is arranged on the storage frame, the bottom end of storage frame is provided with mounting plate, conveying belt is arranged on first mounting bracket, conveying belt is located the side of storage frame;Adjusting assembly is arranged in storage frame, adjusting assembly includes movable plate sliding in mounting plate, the top of movable plate is provided with knob;When movable plate reciprocating sliding in mounting plate, knob pushes plastic gear shaft body in storage frame to slide on conveying belt;Conveying belt and mounting rod are rotated by servo motor synchronous drive, and the abutment transmission of cam plate and connecting plate is combined, reciprocating sliding push material is realized, cooperate the elastic reset of connecting spring, ensure that plastic gear shaft body is stably conveyed from storage frame to conveying belt, reduce feeding interruption.

The embodiment of the application provides a control method and device of a rod wire loop device and a storage medium, the control method comprises the following steps: determining a loop starting time of the loop device according to a rolling piece running speed of a target rolling piece and a downstream rack biting time; determining a real-time loop height value according to the loop starting time, a loop starting initial height, a steady-state target loop height and a ramp rising time, and controlling the loop device to start the loop according to the real-time loop height value; acquiring a real loop height value of the loop device, and correcting an upstream rack running speed according to the real loop height value and the real-time loop height value; and when a tail of the rolling piece leaves the upstream rack, the loop device is controlled to fall back according to a tail loop closing target height. The method realizes adaptive control of the rod wire loop.

The invention relates to a method for efficiently preparing a high-performance material by simulating additive manufacturing, which comprises the following steps: respectively simulating green body printing and sintering processes by adopting CFD and PFS methods, cooperatively calculating green body printing and sintering process parameters, and preparing the high-performance material by adopting the obtained process parameters. The method specifically comprises the steps that CFD is adopted to simulate feed flow and green body temperature field distribution in the green body printing process, PFS is adopted to simulate green body printing pore defect evolution, and a printing temperature interval and a printing speed interval are obtained through calculation; pFS is adopted to simulate morphology evolution and rearrangement of powder particles in the sintering process and sintering microscopic structure evolution, and a sintering temperature interval is obtained through calculation; and preparing a high-performance material or product by adopting the process parameters obtained by simulation. By means of CFD and PFS collaborative simulation of green body printing defect and sintering defect evolution, optimal process parameters for eliminating defects are obtained, the high-performance material is prepared, the problems that high-performance material additive manufacturing is low in efficiency and high in cost are successfully solved, the method is simple, and large-scale production is facilitated.

The invention relates to a high-intensity focused ultrasound-assisted laser lift-off method, and belongs to the technical field of silicon carbide wafer lift-off. The method comprises the following steps: a, forming a modified layer: providing a silicon carbide crystal ingot, positioning a laser focus point F of a pulse laser ray L at a preset depth in the silicon carbide crystal ingot by adopting the pulse laser ray L with the wavelength permeable to the silicon carbide crystal ingot, and forming the modified layer in the silicon carbide crystal ingot by relatively moving the silicon carbide crystal ingot and the laser focus point F; and b, a wafer stripping step: providing a high-intensity focused ultrasound generating device. According to the invention, the fundamental innovation of the stripping mechanism is realized, the stripping efficiency is high, the action position is accurate, and the damage is more controllable; energy is highly concentrated and precisely acted, energy dispersion is avoided, and the stripping precision is improved; process integration is achieved through synchronous machining, the problems of secondary clamping, interface re-healing and the like are avoided, and efficiency and consistency are improved; the thermal damage and the mechanical damage are obviously reduced; by adjusting the focus position, the system can adapt to complex structures and deep modification.

The application discloses a kind of full-automatic multi-station traditional Chinese medicine granule dispensing system, the system includes dispensing platform, medicine device, medicine cabinet, mechanical arm, supply box device, load box carousel, sealing device, box outlet device, weighing device and dose visual monitoring device.Wherein, dispensing system and medicine cabinet are regular polygon layout, medicine cabinet is set around dispensing system;Mechanical arm can automatically grab medicine bottle from medicine cabinet and place on dispensing station of dispensing system, or, grab medicine bottle from dispensing station and return to medicine cabinet;Supply box device can separate and convey stacked medicine box to load box carousel, and load box carousel sequentially conveys medicine box to dispensing station.In addition, the application also discloses a kind of full-automatic multi-station traditional Chinese medicine granule dispensing method, and the dispensing method is applied to traditional Chinese medicine granule dispensing system.Wherein, the dispensing method includes continuous uninterrupted dispensing of medicine and medicine box according to prescription requirements, each medicine is placed in dispensing station immediately start medicine dispensing operation, and multiple prescriptions are processed in parallel with water flow.The application realizes the rapid automation of traditional Chinese medicine granule medicine by the integration of medicine cabinet and dispensing system regular polygon layout and continuous uninterrupted dispensing of medicine, medicine box and medicine, and realizes the parallel dispensing of multiple prescriptions with water flow, significantly reduces the complex repetitive mechanical and manual operation, and improves the dispensing efficiency of medicine.

The invention relates to the technical field of brake disc materials, and discloses a brake disc material prepared from a carbon-ceramic composite material and a processing technology thereof.The processing technology comprises the following steps that phenolic resin, carbon powder, metal oxide, composite carbon fibers and a pore forming agent are evenly mixed and then placed in a mold, and a composite material prefabricated body is obtained through compression molding and cold water demolding; processing the composite material preform to form a carbon-ceramic brake disc rough blank, and then performing carbonization treatment to obtain a carbonized composite material; and mixing the carbonized composite material with silicon powder, carrying out siliconizing treatment, soaking in a protective solution, sintering, taking out, polishing and perforating to obtain the brake disc material prepared from the carbon-ceramic composite material. The composite carbon fiber contains a large number of silicon hydroxyl groups and can be tightly combined with phenolic resin, carbon powder, metal oxide and a pore-forming agent, and the polycarbosilane layer generates a nanoscale silicon carbide phase, so that the mechanical property and wear resistance of the brake disc material prepared from the carbon-ceramic composite material can be improved.

The invention relates to a bi-crosslinking cyanate ester-epoxy blended adhesive and a preparation method thereof, and relates to the technical field of high polymer materials, the adhesive comprises the following components in parts by weight: 45-85 parts of cyanate ester resin, 5-35 parts of epoxy resin, 0-20 parts of a reactive diluent, 2-6 parts of a bi-crosslinking curing agent and 0-50 parts of a functional filler, the bi-crosslinking curing agent has the following structure: R is alkyl, aliphatic amine or aryl; r'is a primary amino group and / or a secondary amino group, R ''is-C = N and / or-OCN, m is an integer from 1 to 3, and n is an integer from 1 to 2. By adding the double-crosslinking curing agent containing the amino group and the cyano group, the technical problems of high curing temperature, large stress after curing, poor temperature resistance of epoxy resin and the like of the existing cyanate ester resin system are solved, and the curing temperature, the bonding strength and the temperature resistance of the adhesive are balanced. The adhesive can be cured at the temperature lower than 90 DEG C, and has high glass transition temperature, low thermal weight loss and excellent adhesive property.

The invention provides a cabbage head harvester with a variable-diameter leaf removing mechanism and a harvesting method. The problems that in the prior art, manual harvesting efficiency is low, and leaf removing cannot be adjusted in a self-adaptive mode according to crop sizes and irregular shapes in equipment harvesting are solved. Comprising a movable chassis, a leaf threshing and root cutting mechanism, a leaf removing mechanism and a material transferring mechanism, the movable chassis comprises a rack, and a middle through groove is formed in the front-back direction of the rack; the leaf threshing and root cutting mechanism comprises a leaf threshing assembly and a root cutting assembly, and the leaf threshing assembly and the root cutting assembly are connected into the middle barrel groove of the rack through the conveying mechanism. The leaf threshing assembly is located in front of the root cutting assembly. The leaf removing mechanism is located below the output end of the conveying mechanism. The material transferring mechanism comprises a material transferring plate and a material transferring assembly. When the material transferring assembly acts, the leaf-removed cabbage heads output from an outlet of the material transferring plate are conveyed into a material storage pool above the machine frame. The machine can not only improve the harvesting efficiency, but also adapt to green vegetable heads with different sizes and irregular shapes for leaf removal.

This application discloses a piston-type multi-way valve and a water softener, comprising: a housing having a cavity, a first guide hole, and a second guide hole, the first guide hole communicating with the cavity; a sealing piston movably disposed within the cavity; a drive mechanism disposed on the housing; and a movable component having a first connecting portion and a second connecting portion, the first connecting portion slidably passing through the first guide hole and connected to the sealing piston, the second connecting portion being connected to the output end of the drive mechanism and slidably inserted into the second guide hole. By providing the first and second guide holes on the housing, the first connecting portion of the movable component slides within the first guide hole, and the second connecting portion of the movable component slides within the second guide hole, forming a dual-point cooperative guiding structure. This effectively limits the radial sway of the movable component during long-distance reciprocating motion, ensuring the straightness and stability of its motion trajectory, and improving the motion stability of the movable component.

The invention discloses an insulator for a direct current converter transformer and an online monitoring method thereof, and relates to the technical field of insulators. According to the insulator for the direct current converter transformer, the insulator body and the connection structure are internally integrated with a multi-stage state monitoring system comprising a first-stage sensing unit, a second-stage sensing unit and a third-stage sensing unit; according to the invention, three types of key state data of internal mechanical stress of the insulator, the connection state of the first metal accessory and the second metal accessory and the overall temperature distribution can be synchronously acquired in real time, real-time monitoring of the insulator and multi-dimensional comprehensive information acquisition are realized, early warning is realized based on the multi-dimensional comprehensive information, and the reliability of the insulator is improved. According to the method, preliminary early warning can be carried out according to single data, meanwhile, time-space alignment and comprehensive judgment can be carried out on multi-dimensional data, high-level fault early warning is carried out, the stability and reliability of the insulator are improved, and sudden faults are reduced.

The application discloses a portable broad bean picking device and a picking method thereof, and relates to the technical field of agricultural machinery, comprising a rotary cutting gear transmission mechanism and a steel wire centering guide mechanism; the rotary cutting gear transmission mechanism comprises a rotary cutting gear which is hollow and provided with circumferential radial notches and a suspension supporting structure, the rotary cutting gear is connected with a rotary cutting tool and externally engaged with a driving gear; the suspension supporting structure comprises circular arc tracks arranged on upper and lower surfaces of the rotary cutting gear and a plurality of universal ball bearings thereon; the steel wire centering guide mechanism comprises a plurality of elastic steel wires which are circumferentially arranged around the rotary cutting tool rotation center and a radial opening and closing mechanism. The application realizes continuous, efficient and in-situ cutting of broad beans from stems, can adapt to plants in different growth states, and significantly reduces the missing picking rate and damage; the handheld design makes the operator keep upright operation, reduces the labor intensity, the overall structure is light and flexible, and provides an efficient and labor-saving picking solution for small and medium-sized planting.

This invention relates to the field of coatings, specifically to an industrial anti-corrosion coating and its preparation method. The coating comprises a film-forming resin, a curing agent, a solvent, and an anti-corrosion composite nanofiller. The anti-corrosion composite nanofiller has a three-layer structure: a core layer of mesoporous silica loaded with an organic corrosion inhibitor; a middle shell layer of in-situ grown amino-functionalized metal-organic framework material; and an outer layer of low surface energy formed by modification with a hydrophobic modifier.

The invention provides an intelligent generator control method and device based on a dynamic load and electronic equipment, and belongs to the field of power grid fluctuation suppression, the method is applied to an energy management unit in a gas power generation system, and the gas power generation system further comprises a gas generator set, an energy storage converter, a super capacitor and a CT mutual inductor. The method comprises the following steps: counting power change times and a power change value of a load within a preset time length based on electrical parameters of a power grid side load; selecting a working mode as a constant power factor mode, a constant reactive power mode or an automatic adjustment mode based on the power change frequency and the power change value; and based on the operation state parameters of the super capacitor, controlling the total output power of the gas generator set in the three adjusting modes. According to the invention, stable power supply of the load can be maintained through adjustment of the super capacitor and the energy storage converter, the adjustment frequency of the gas generator set is reduced, and the power generation efficiency of the gas generator set is improved.

The invention relates to the technical field of artificial board processing, in particular to a preparation method of green low-toxicity flame-retardant plywood. The method comprises the following steps: S1, green synthesis and step-by-step dipping treatment of a complexing phosphorus-nitrogen flame retardant; s2, preparation of a flame-retardant adhesive and construction of an interface intumescent flame-retardant system; s3, stepped layered assembly and hot press molding; s4, conducting ion regulation and anti-rust treatment; wherein the complexing phosphorus-nitrogen flame retardant in the step S1 takes phosphorus and nitrogen as core flame-retardant elements and is synthesized through a complexing rapid reaction and cross-linking reaction technology, the reaction temperature is 80-100 DEG C, and the reaction time is 30-60 minutes; the mass ratio of the phosphorus-containing metal complex precursor to the nitrogen source compound to the chitosan to the catalytic substance is (2-3): (5-6): (1-3): (0.5-1). According to the flame-retardant plywood prepared through the method, the combustion rate growth index is smaller than 100 W / s, the 600-s total heat release amount is smaller than 7.0 MJ, the smoke generation rate index of the smoke generation characteristic is smaller than or equal to 30 m / s, the 600-s total smoke generation amount is smaller than or equal to 50 m, and multiple technical defects of traditional flame-retardant plywood are overcome.

The invention discloses an idling start-stop control method based on navigation traffic information, which comprises the following steps: when a vehicle is in a navigation state, a start-stop forbidding judgment module acquires traffic information of an intersection in front of a planned driving path in real time, including a signal lamp state, lamp changing remaining time and a distance to a stop line; when the vehicle approaches the target intersection, combining the vehicle state and the traffic information, and generating a forbidding request signal of the idle start-stop system through judgment logic; the power control execution module executes a final control action for forbidding automatic flameout of the engine based on the forbidding request signal. According to the invention, the problems of unnecessary start and stop and influence on driving smoothness and energy consumption caused by incapability of accurately associating path-related signal lamps and passing scenes in the prior art are solved, intelligent cooperative control of the idle speed start and stop system based on navigation information is realized, and vehicle energy consumption is optimized while driving experience is improved.

This invention discloses a method for preparing conductive PET fiber. The invention relates to the field of functional chemical fiber preparation technology. The method involves copolymerizing bis(2-hydroxyethyl) disulfide (HEDS, 2-5 mol% of the total molar amount of diols) with terephthalic acid and ethylene glycol to prepare disulfide-modified PET (SS-PET). TiO2@ATO conductive whiskers (aspect ratio not less than 20, whiteness index not less than 80) are treated with a titanate coupling agent and then melt-blended with SS-PET to prepare ATO-SS-PET composite masterbatch. High-viscosity pure PET is used as the core layer, and ATO-SS-PET composite material is used as the sheath layer (whisker content 5-12 wt%), with a core-sheath mass ratio of 60:40-80:20. The finished fiber is obtained through core-sheath composite melt spinning, multi-stage hot roller stretching, and high-temperature, high-pressure dyeing with disperse dyes. During the dyeing process, the disulfide bonds in the sheath are dynamically exchanged at 125–135℃, which drives the stretched and disassembled conductive whiskers to re-randomize and re-align, and the three-dimensional conductive permeation network is self-repaired and rebuilt in situ.

The invention discloses a gear position self-learning method, system and equipment of a gear shifting mechanism and a medium, and relates to the technical field of computers.The gear shifting mechanism comprises a reduction gear, a threaded lead screw, a gear shifting fork and a dog-tooth clutch, the reduction gear drives the gear shifting fork through the threaded lead screw to achieve combination and separation of the dog-tooth clutch so as to conduct gear shifting, the method comprises the steps that under the condition that gear position information of a gear shifting mechanism is abnormal, whether the driving state of a target vehicle meets a preset self-learning condition or not is determined; if the self-learning condition is met, the current position of the threaded lead screw is obtained; locked-rotor detection is carried out on the gear shifting mechanism from the current position of the threaded screw rod, and the actual total stroke of the threaded screw rod in the locked-rotor detection process is obtained; if the stroke deviation between the actual total stroke and the preset theoretical total stroke is smaller than or equal to the preset error threshold value, the position information of the actual top dead center and the actual bottom dead center serves as the updated gear position to be stored.

The invention discloses leek harvesting and hotbed chive cultivation integrated equipment. The equipment comprises an advancing device, and a bionic cutting device, a sleeve conveying device, a flexible conveying device and a sleeve placing and stably holding device which are integrated on the advancing device. The bionic cutting device achieves bionic linkage of clamping, lifting and cutting through a single driving piece and a gear transmission mechanism, harvesting damage is effectively reduced, the sleeve conveying device is provided with a rotatable baffle mechanism, double-channel conveying blockage is prevented, the sleeve placing and stabilizing device adopts a double-groove cam separation mechanism and a clamping jaw type stabilizing mechanism, and the cutting efficiency is improved. And stable separation and placement of the sleeve are realized. The equipment can automatically identify the position and crop rotation of Chinese chives through integrating visual identification and a main control system, cooperatively controls each module to complete the whole-process integrated continuous operation from identification, harvesting, conveying to sun-shading sleeve placement, and has the advantages of high automation degree of operation, small crop damage, stable and reliable sleeve placement and suitability for large-scale continuous production.

The utility model discloses a kind of multi-grade adjustment rotary switches, including base, shell cover, rotating handle and contact assembly, rotating handle rotationally arranged between base and shell cover, and drive rod extending along its radial direction is provided;Contact assembly includes the multiple elastic structure's moving contact bridge of the shaft center of rotating handle as center annularly arranged in installation cavity, and multiple static contact pieces are arranged in base and respectively opposite multiple moving contact bridges, multiple moving contact bridges are connected and respectively located on the movement path of drive rod, drive rod respectively drives multiple moving contact bridges and multiple static contact pieces contact in rotating handle rotating process, by the mechanism of the wheel contact formed by drive rod and multiple moving contact bridges, operation pressure is significantly dispersed, avoid single moving contact bridge sustained stress, greatly reduce the mechanical load and fatigue degree of moving contact bridge, reduce the probability of heating, reduce wear and risk of fusion welding, extend mechanical service life.

The application relates to the technical field of water treatment equipment, and relates to a water treatment equipment which comprises a water storage device and a temperature adjusting device; the temperature adjusting device comprises a heat exchange structure and a heat exchange component; the heat exchange structure has a first heat exchange end and a second heat exchange end; the first heat exchange end is thermally coupled to the water storage device; and the second heat exchange end is thermally coupled to the heat exchange component; wherein the heat exchange structure comprises a first heat exchange piece and a second heat exchange piece; and the first heat exchange piece is thermally coupled to the second heat exchange piece. The water treatment equipment of the embodiment adopts the heat exchange structure of double refrigerating pieces superposition; the first heat exchange piece is thermally coupled to the second heat exchange piece; one refrigerating piece is used to cool the other refrigerating piece; the temperature difference between the two ends is obviously improved; and the heat exchange effect is improved.

This invention provides a stacker crane for aisle storage, including a traveling base beam and a stacking device on the traveling base beam. A buffer device is also provided on the traveling base beam, and an adjustment device is installed at the outer end of the buffer device. The buffer device includes a buffer frame on the traveling base beam, with multiple sets of buffer crossbeams fixedly connected to both sides of the buffer frame, defining multiple buffer levels distributed vertically within the buffer frame. Buffer plates are fixedly connected to the multiple sets of buffer crossbeams, and multiple sets of goods are placed on the buffer plates. A conveying component is provided on the buffer plates, and scanning components are provided on the multiple sets of buffer crossbeams. A contact component is provided at one end of each set of buffer crossbeams. This invention improves storage and retrieval efficiency through multi-level buffering and path optimization, achieves real-time monitoring and automatic correction of goods status through intelligent scanning and pressure sensing fusion, and completes high-precision automatic docking based on laser ranging and electromechanical linkage. Ultimately, it constructs a highly efficient, reliable, and fully automated intelligent warehousing and stacking system.

The utility model belongs to the technical field of waste treatment, and discloses a demisting device for an absorption tower, the demisting device comprises a demisting assembly I and a demisting assembly II, the demisting assembly I is coaxially mounted in an air inducing pipeline, a backflow cavity I is positioned between the side wall of a reaction cavity and the inner side wall of the absorption tower, the top end of the backflow cavity I is open, and the air inducing pipeline is communicated with the backflow cavity I; a second backflow cavity is formed between the outer side wall of the air inducing pipeline and the outer cavity wall of the top end of the reaction cavity, the second backflow cavity is communicated with the air inducing pipeline, a hydrophilic semi-permeable membrane is arranged at the communication position, and the side end of the second backflow cavity is communicated with the first backflow cavity; the bottom of the exhaust cavity communicates with an air inlet pipeline, and the lower end of the air inlet pipeline communicates with the air inducing pipeline and the first backflow cavity. The second demisting assembly is installed in the air inlet pipeline, and an exhaust port communicating with the outside is formed in the top of the exhaust cavity. According to the demisting device, the flowing path of liquid is changed, the situation that the liquid and gas are repeatedly mixed to generate mist again can be reduced, secondary demisting is conducted through the second demisting assembly, and the demisting effect is improved.

This invention discloses a waste recycling device for FIBC (Flexible Intermediate Bulk Container) processing, relating to the field of comprehensive environmental utilization of solid waste. The device includes a hollow frame, a hydraulic rod mounted on the hollow frame, and a pressure plate mounted on the hydraulic rod. The equipment continuously feeds FIBC waste into a flattening machine. The pressure plate is automatically triggered by the weight of the waste, achieving a complete automatic cycle of feeding, weighting, triggering, compaction, resetting, and locking, thus improving waste recycling efficiency. When not in operation, the pressure plate is rigidly limited by a limiting mechanism, preventing hydraulic system depressurization or accidental drop. This ensures uniform compaction density of the plastic waste, reducing the mixing and adhesion of plastic and impurities due to insufficient compaction, facilitating subsequent separation of plastic from other components. It also protects core components such as the hydraulic rod and pressure plate, extending equipment lifespan, reducing maintenance costs, and contributing to the resource-based recycling of plastic waste and comprehensive utilization of solid waste.

The utility model provides a sealed low noise explosion -proof motor relates to motor technical field, include: explosion -proof casing, the bottom position of explosion -proof casing is equipped with two steady legs with bolt mounting hole, the one side installation of explosion -proof casing first seal cover, the inside position installation of explosion -proof casing motor body, the other side installation of explosion -proof casing one connection flange, install a group of locking bolt that is annular array distribution between explosion -proof casing and connection flange. Conveying pump has replaced traditional fan heat dissipation, has reduced the generation of mechanical vibration and noise, in the operation process, motor can keep quiet and stable, has improved the working environment significantly, has reduced the influence of noise to operating personnel, the loose frame will a group of bolt fast anti -loose, avoids the seal cover of binding post loose, avoids connection flange loose, operating personnel will loose frame reverse push after can realize the quick unlocking of locking bolt, has improved the practicality and stability of anti -loose.

The present application relates to a kind of antibacterial and anti-adhesion catheter based on intelligent response nanofiber membrane, which is composed of medical polymer catheter substrate, silane coupling agent transition layer grafted on the outer surface of the substrate and nanofunctional fiber membrane layer formed on the outer surface of the transition layer by electrospinning process, the nanofunctional fiber membrane layer is composed of polyvinyl alcohol loaded hyaluronic acid grafted copper-doped carbon dots (CCDH), CCDH takes copper-doped carbon dots as core, and forms core-shell structure by grafting hyaluronic acid on the surface. The present application solves the problem of easy peeling of catheter coating by chemical bonding, and the formed antibacterial and anti-adhesion catheter has very low water contact angle and friction coefficient, not only effectively blocks the initial adhesion of bacteria at the physical level by constructing hydration layer, but also releases copper ions and carbon dots by enzymatic hydrolysis of hyaluronic acid under bacterial infection microenvironment, induces the production of reactive oxygen species to kill bacteria efficiently, and has broad application prospect in reducing the risk of catheter-related urinary tract infection.

The utility model relates to building technical field discloses a prefabricated pipe pile stand column steel support joint, including prefabricated pipe pile stand column, the pile head is arranged at the top of prefabricated pipe pile stand column, the microexpansion concrete filling core is equipped in prefabricated pipe pile stand column, the microexpansion concrete filling core bottom end is fixedly connected circular thin steel plate through anchor bar, the top end fixedly connected with anchor plate of anchor bar, the pile head is equipped with longitudinal reinforcement framework and transverse stirrup, steel support, steel support sets up on anchor plate, and the groove section steel is connected through the welding of the angle weld of steel support side surface and forms. In the utility model, the longitudinal reinforcement framework and transverse stirrup are arranged in the pile head to form the reinforcement net cage, and the microexpansion concrete filling core is adopted to pour to enhance the bending, shearing strength of pile head, and the connecting structure of anchor bar, anchor plate and circular thin steel plate makes steel support load can be evenly transmitted to prefabricated pipe pile stand column through anchor plate, and the reliable bearing capacity and crack resistance of node are ensured.

The invention relates to the technical field of circuit board processing, in particular to a pneumatic vibration main shaft for circuit board processing and a circuit board drilling method. The main shaft comprises a main shaft shell, a floating rotating shaft and a pneumatic vibration assembly. The pneumatic vibration assembly is provided with a first air pressure cavity and a second air pressure cavity which are oppositely arranged in the axial direction of the floating rotating shaft, and a first air path and a second air path which are communicated with the two cavities and can independently control air pressure. By controlling the air pressure of the two air paths, a controlled air pressure difference is formed between the two cavities, so that the floating rotating shaft is driven to generate axial reciprocating vibration. Axial micro-vibration of the drill point is achieved through the pure pneumatic principle, chip removal in the drilling process is effectively promoted, the hole wall quality and the drilling precision are improved, and the system is simple in structure and high in anti-interference capacity.