335results about How to "Reduced stability" patented technology

The invention provides an electric control box remote data acquisition system based on the Internet of Things, and relates to the technical field of data processing, and the method comprises the steps: obtaining the operation state data of an electric control box through a sensor, transmitting the operation state data through a wireless signal network, obtaining a data frame set, analyzing the data identifier of each data frame, verifying the integrity of the data, and obtaining the data frame set; determining performance parameters of the wireless signal network, detecting whether an abnormal change occurs in the transmission process, generating a solution when the abnormal change occurs, generating a retransmission signal when packet loss occurs in the transmission process, determining a retransmission queue according to the data identifier, and transmitting the retransmission signal according to the retransmission queue when delay occurs in the transmission process. The priority of a retransmission queue and the distribution of network bandwidth are dynamically adjusted, and when signal attenuation occurs in the transmission process, the execution sequence is adjusted according to the operation record and result of a solution by switching a transmission channel and adjusting transmission power. The transmission process of the operation data of the electric control box can be detected.

The invention provides an antenna signal detection network, a detection method, an antenna system and a base station. The detection network comprises two correction channels and a switching network. Wherein the first correction channel comprises a plurality of first output ports, and the phases of the plurality of first output ports are the same; the second correction channel comprises a plurality of second output ports, the number of the second output ports is the same as that of the first output ports, the phases of the plurality of second output ports are different, and the plurality of first output ports and the second output ports are connected with the antenna array; the switching network is respectively connected with the two correction channels and is used for realizing the connection of the two correction channels with the calibration port in different time domains, and the calibration port is connected with the RRU and is used for inputting a transmission signal between the antenna array and the RRU. According to the antenna signal detection network, the antenna signal detection method, the antenna system and the base station provided by the invention, whether the connection between the antenna array and the RRU is correct or not can be quickly and conveniently detected.

The invention relates to the field of spindle boxes, and discloses a shockproof high-precision spindle box structure which comprises a spindle box body. A buffering assembly is arranged at the bottom end of the main spindle box body, first buffering springs are evenly installed at the bottom end of the main spindle box body, spring seats are installed at the bottom ends of the first buffering springs, auxiliary assemblies are arranged at the top ends of the spring seats, and connecting round rods are fixedly installed between the spring seats. Sliding seats are slidably mounted on one sides of the spring seats, the sliding seats are connected through second buffer springs, and connecting rods are rotatably mounted at the top ends of the sliding seats; by arranging the auxiliary assembly, the damping protection effect of the device on the main spindle box body is enhanced, the springback speed of a first buffer spring is reduced, resetting of the main spindle box body is smoother and more stable, then the working precision of the main spindle box body is improved, and the quality of machined products is improved.

The invention discloses a backlight module processing coating flatness monitoring system based on machine vision, relates to the technical field of processing coating monitoring, and solves the technical problems that in the prior art, the influence of a coating material cannot be analyzed, and the execution efficiency of processing coating is reduced. The method specifically comprises the steps that a film covering influence analysis unit analyzes the processing film covering influence of the backlight module, film covering material thickness data and film covering glue matching data are collected, and whether the film covering material and a glue matching material are influenced or not is deduced through data comparison; the processing and laminating influence of the backlight module is analyzed, whether flatness floating is influenced by a laminating material or not in the processing and laminating process is deduced by analyzing the influence of the laminating material, so that the laminating material is repaired and replaced in time, and the situation that the use efficiency of the laminating material is reduced due to the fact that the influence of flatness floating cannot be solved due to reworking is avoided. And the film coating processing progress of the backlight module is influenced.

A low-torque loading device provided by the present invention comprises a tooth-shaped belt wheel, a tooth-shaped belt, a first spring, a second spring, a zero setting pull rod, a zero setting bolt and nut combination, a shell and a cover plate, the tooth-shaped belt wheel, the tooth-shaped belt, the first spring and the second spring are installed in the shell, the tooth-shaped belt wheel is connected with the shell, the tooth-shaped belt wheel is kneaded with the tooth-shaped belt, and the zero setting bolt and nut combination is connected with the shell. One end of the cog belt is fixedly connected with the bottom frame of the shell through a first spring, and the other end of the cog belt is connected with a zero setting pull rod penetrating through the inner side of the bottom frame of the shell through a second spring. According to the invention, through the positive correlation of the difference between the load torque and the tension of the double springs and the adoption of differential loading, the error caused by the springs is eliminated, the error is reduced, and the loading precision is improved.

The utility model discloses a flexible photovoltaic support in the technical field of solar photovoltaic, which comprises at least two groups of photovoltaic supports which are longitudinally arranged, connecting pieces are arranged in the longitudinal direction, a plurality of groups of photovoltaic supports are connected through the connecting pieces, each group of photovoltaic supports at least comprises two bases, two inhaul cables and a photovoltaic assembly, the bases are transversely arranged, and the photovoltaic assemblies are arranged on the bases. The lower ends of the bases are fixed on the ground, the bases are connected through the inhaul cables, the photovoltaic modules are fixed on the inhaul cables, the connecting pieces comprise span stabilizing pieces and connecting ropes, the span stabilizing pieces are connected between the inhaul cables arranged on each group of photovoltaic supports side by side, and the connecting ropes are used for connecting the span stabilizing pieces on two adjacent groups of photovoltaic supports. According to the flexible photovoltaic support, the technical problems that a certain safety risk exists and the labor intensity and the installation difficulty are increased due to the fact that an installation instrument needs to be manually lifted on a mountainous region to pre-tighten a steel rope in an existing device are solved, and the installation difficulty and the labor intensity are reduced, and the installation cost is reduced.

The present invention discloses a secondary return optical path scanner device and calibration method, belonging to the field of scanner technology, the device includes an optical path return module, the optical path return module is arranged between the optical lens and the CMOS, used for controlling the optical path, splitting a single section of the optical path into multiple sections of the optical path; wherein the optical path return module includes a primary return mirror, a secondary return mirror and a return bracket, the primary return mirror and the secondary return mirror are assembled on the return bracket, the primary return mirror and the secondary return mirror are used to return the optical path, and adjust the position and posture of the light incident on the CMOS. The present invention utilizes the optical path return, optimizes the layout, achieves the purpose of miniaturization, can freely adjust the position and posture of the core components, so that the scanner device has greater variability in structure, and improves the space utilization rate of the whole machine.

The invention discloses a portable agricultural unmanned aerial vehicle shelter which comprises a shelter body, a limiting seat is arranged in the shelter body, a supporting plate is installed on the limiting seat, a motor is installed at the side end of the limiting seat, and the output end of the motor is connected with a first sleeve through a first driving part; the interior of the first sleeve is connected to the bottom of a supporting plate through a first screw rod, and the side end of the supporting plate is connected with a clamping plate through a rotating assembly. According to the portable agricultural unmanned aerial vehicle shelter, an unmanned aerial vehicle is placed on a supporting plate, a lifting plate arranged at the bottom of the supporting plate drives a second sleeve to descend, a ball in the second sleeve drives a second screw to rotate, and a first rotating rod on the second screw drives a clamping plate to rotate; the unmanned aerial vehicle base can be conveniently clamped and fixed through the clamping plates, the overall mechanical structure has high stability and durability, and the problem that the stability is reduced due to the fact that springs are adopted for limiting is solved.

This invention relates to the field of semiconductor optoelectronic device technology, specifically to a method and application for reducing the contact resistance of high-Al-content n-AlGaN materials in device manufacturing processes. The method involves surface atom adsorption and annealing of the n-AlGaN layer under a protective gas atmosphere; the atoms are Si and N atoms. This method significantly increases the carrier concentration on the material surface, thereby contributing to excellent ohmic contact performance and reducing the material's contact resistivity. It solves the problem of difficult ohmic contact preparation for high-Al-content n-AlGaN materials, especially the difficulty in forming ohmic contacts after etching. The method is simple and reproducible, effectively avoiding the complexity and instability of existing processes such as acid / alkali corrosion or high-temperature annealing. It ensures large-scale mass production and has no adverse effects on subsequent device fabrication, exhibiting good process compatibility.

The present application relates to the field of gas turbine technology, specifically to a sand supply device for gas turbine engine sand dust deposition experiment; including box, air intake system, air outlet system, stirring system and dust concentration measuring instrument; air intake system is arranged in the lower part of the box; the air outlet system is arranged in the upper part of the box, and the air outlet system contains height-adjustable air outlet; the input end of the air outlet is provided with an air outlet inlet flow diverter; the stirring system is installed at the bottom of the box, including servo motor, motor support and stirring impeller. According to the target particle concentration, the height of the air outlet inlet flow diverter is adjusted as the main means, and the air inlet flow and speed of the air inlet and the stirring impeller speed are fine-tuned, and through the coupling effect of the three, the high, medium and low concentration levels can be continuously adjusted, covering the engine full working condition sand dust simulation demand, solving the problem of single adjustment mode and insufficient precision of traditional device.

The utility model discloses a slit extrusion die head mechanism, and mainly relates to the technical field of extrusion coating. Comprising a die head body, positioning carrier rollers and guide carrier rollers, an extrusion slit is formed in one side of the die head body, the positioning carrier rollers are arranged in parallel relative to the extrusion slit, positioning plates are arranged at the two ends of each positioning carrier roller respectively, adjusting seats are fixed to the sides, away from the die head body, of the positioning plates, and the sides, away from the die head body, of the adjusting seats are mounting surfaces. The die head comprises a die head body, a mounting face is arranged on the die head body, the mounting face is an inclined face inclining in the direction away from the die head body from bottom to top, an inserting groove extending in the length direction of the mounting face is formed in the mounting face, a sliding block sliding in the inserting groove and capable of being locked is arranged in the inserting groove, a moving block is fixed to the outer end of the sliding block, and shaft seats are arranged at the two ends of the guide carrier roller. And the shaft seat is fixed at the outer end of the moving block. The device has the beneficial effects that the tension and the running direction of a base material after coating can be better controlled, so that the coating stability is ensured.

The embodiment of the invention discloses a high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe and a preparation method thereof, relates to the technical field of non-ferrous metal material manufacturing, and aims to solve the technical problem of poor production in the prior art. According to the high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe, the content of Ni ranges from 9.0% to 11.0%, the content of Fe ranges from 1.0% to 2.0%, the content of Mn ranges from 0.5% to 1.0%, the sum of impurity elements does not exceed 0.2%, and the balance is Cu.

The present application relates to the field of environmental protection, and particularly to a technology for disposing of wind power generation scrap materials by using industrial kiln; the organic metal catalytic adsorption filler prepared by the present application is used for adsorbing dioxins in flue gas; through catalytic reaction, the dioxins are converted into more harmless or more easily handled compounds, so as to reduce the content; at the same time, the adsorption effect can also help to remove dioxins from the flue gas; such conversion includes breaking of chemical bonds, rearrangement or change of functional groups, etc.; through these changes, the toxicity and stability of dioxins are reduced, so that they are more easily handled or degraded; at the same time, due to the adsorption effect, the dioxins are fixed on the catalyst or adsorbent, so as to be effectively removed from the flue gas; the present application has simple process, small investment, low cost and high economy, and industrial waste such as plastic, rubber, tire, etc. is used as combustion-supporting material.

The application discloses a kind of deep melting interlayer development area rigid pile composite foundation structure design method, it is related to rigid pile composite foundation field, including the following steps: step one, in the existing rigid pile bearing capacity calculation process, front-end increase subgrade-ground temperature field analysis;Step two, increase groundwater analysis;Step three, determine the compression modulus of the soil layer of seasonal freeze-thaw layer, (water-rich) melting interlayer, permafrost layer, bearing capacity characteristic value, check the single pile bearing capacity characteristic value of different positions in the cross section of roadbed using different pile length, pile diameter, pile body stiffness material;Step four, carry out zoned unequal design, adjust pile length, pile diameter, pile body stiffness, so that the range of all pile single pile bearing capacity characteristic values in cross section is lower than design allowable value.The application effectively optimizes pile foundation design, reduces material waste, reduces engineering cost, while ensuring the safety and stability of structure.

The invention discloses a multi-stage HDI circuit board and a manufacturing method thereof. The circuit board comprises a first core board, a second core board and a porous filling layer. The first core plate is composed of a porous material base layer and first conductive pattern layers on the upper and lower sides; the second core plate is arranged on the outer layer of the first core plate and comprises an inner side PP layer and a second conductive pattern layer covering the inner side PP layer, the PP layer is provided with conducting holes and heat dissipation holes, the conducting holes are filled with conductive metal materials to achieve conduction, the heat dissipation holes are blind holes, the bottoms of the heat dissipation holes directly penetrate through the base layer, and the heat dissipation holes are filled with porous materials to enhance heat dissipation. The manufacturing method comprises the steps of cutting, pressing, etching, drilling, conductive material filling, polishing, secondary etching, secondary drilling, porous material hole filling, plate cutting and the like. Through the cooperation of the porous material base layer and the porous filling layers in the heat dissipation holes, the heat dissipation performance of the HDI circuit board is significantly improved, the conduction structure is optimized, the structural strength is enhanced, the manufacturing flexibility is improved, the cost is reduced, and the HDI circuit board is suitable for various application scenes of high-density interconnection circuit boards.

The utility model relates to the field of ethnic costumes, in particular to a display device for ethnic costume pictures. The technical problems that in the using process of a display device, the display effect is poor due to the fact that the display device only has a one-face display effect, the structure is fixed, rotation adjustment cannot be achieved, display flexibility is not achieved, and movement is inconvenient are solved. According to the technical scheme, the national clothing picture display device comprises a fixed box body and further comprises a display frame, walking wheels, universal wheels, a supporting assembly and a display assembly. The rotating flexibility of the rotating disc is improved through the arrangement of the walking wheels, the device can be easily moved to any position according to actual use requirements through the universal wheels, then through the supporting assembly, the rubber pad makes contact with the ground to increase friction force, the displacement phenomenon in the use process is avoided, and through the display assembly, the display effect is improved. The four-side display effect can display various different national garment pictures, and the picture styles in the display shell can be replaced conveniently.

This invention discloses a method and system for treating landfill leachate stock, belonging to the field of wastewater treatment technology. The method includes the following steps: first, adding an appropriate amount of acid to the landfill leachate and stirring until homogeneous to obtain an acidic solution with a pH value below 1.5; then, adding silicate cement to the acidic solution in one go or in small amounts multiple times, mixing thoroughly, and allowing it to settle until solids precipitate before discharging the liquid to the external environment or transporting it to the next process. The total amount of silicate cement added is 6%-10% of the mass of the acidic solution. This method can simultaneously treat TP, TN, and NH3 in landfill leachate. 3 Removal of -N and COD, TP, TN, NH 3 The removal rate of nitrogen (-N) can reach over 75%, and the COD removal rate can reach over 30%. The levels of recalcitrant organic macromolecules and benzene ring compounds are significantly reduced. The organic matter in the water sample is reduced, and the molecular structures are simpler and smaller, which is beneficial for biological decomposition and utilization. The system has a simple structure, is easy to use, and significantly reduces water treatment costs.

This invention discloses a compound traditional Chinese medicine powder inhaler for respiratory tract infections and its preparation method, relating to the field of pharmaceutical formulation technology. The compound traditional Chinese medicine powder inhaler for respiratory tract infections is composed of polysaccharide composite gel microspheres, forsythia, scutellaria, honeysuckle, and isatis root. The polysaccharide composite gel microspheres are composed of seaweed sulfated polysaccharide, lentinan, calcium chloride, and curcumin. Seaweed sulfated polysaccharide, lentinan, curcumin, and calcium chloride cross-link to form a three-dimensional network spherical structure, improving the particle morphology and flowability of the micropowder. Furthermore, due to its good hygroscopic and moisturizing properties, it competitively reduces the moisture absorption of the micropowder, preventing aggregation and further improving flowability. In addition, the gel microspheres have excellent adhesion, adhering to the infection site after entering the respiratory tract, reducing expulsion losses due to respiration, maintaining an effective drug concentration at the infection site, and improving therapeutic efficacy.

The utility model discloses a kind of gas tank dry gas desulfurization systems.The system includes: low temperature absorption tower, in which raw material gas tank dry gas and low temperature absorption oil countercurrent contact;Primary amine liquid absorption tower, in which utilize amine liquid to remove hydrogen sulfide in dry gas after organic sulfur is removed;Hydrolysis reactor, in which carbonyl sulfur in primary absorption tail gas is hydrolyzed, and hydrolysis tail gas is obtained;Secondary amine liquid absorption tower, in which utilize lean amine liquid to remove hydrogen sulfide in hydrolysis tail gas, and after absorption, purified dry gas is obtained.The desulfurization system of the utility model can purify and remove organic sulfide and hydrogen sulfide in dry gas, reduce sulfur content in gas, and then reduce SO2 content in flue gas discharged from heating furnace of subsequent each device, ensure that heating furnace of whole plant is safe, environmental protection, high efficiency and stable operation.

The invention discloses a preparation method of a pavement material based on an alkali-activated fly ash glass body, and relates to the technical field of road engineering materials and hazardous waste treatment. The method comprises the following steps: mixing fly ash with water, removing soluble ions, mixing with a nano material, carrying out melting treatment, and rapidly cooling in a magnetic field environment to obtain a fly ash glass body; performing heat treatment on the sintered red mud to obtain heat activated red mud; preparing a dry material comprising a gel material and aggregate, wherein the gel material is composed of a fly ash glass body and thermally activated red mud; mixing the alkali activator, the water reducer and the nanofiber, and uniformly stirring to obtain a homogeneous solution; and adding the homogeneous solution into the dry material, and uniformly mixing to obtain the pavement material slurry. According to the invention, deep dissolution and recombination of the fly ash vitreous body and the thermally activated red mud are promoted by using an alkali excitation technology, elements are promoted to be rearranged on a molecular level, an aluminosilicate network structure with high strength and durability is formed, heavy metals are effectively fixed, and reduction and recycling of the fly ash and the red mud are realized.

This utility model discloses an aluminum cutting device, including a base, clamping devices, and processing devices. The base includes a processing platform, a support table A, a motor table A, a motor A, a support table B, and a lifting rod. The clamping devices include a rotating frame, a motor B, a rotating cylinder, a clamping block, a limiting rod, a threaded rod, a telescopic rod, and a support table C. The processing devices include a frame, a screw A, a motor D, a slide rod, a sliding table, a laser emitter, a motor E, a screw B, and a sliding groove. This utility model is equipped with multiple clamping devices, which can effectively control the stability of small aluminum materials under the action of the motor. If the view from one side is not easy to position, the aluminum material can be flipped over for cutting. In addition, this utility model is equipped with a multi-directional displacement device, which can effectively control the laser cutter to move back, forth, left, and right, allowing for more flexible cutting of aluminum materials, especially for some irregularly shaped small parts.

The utility model discloses a fishing rod support with a reminding anti-blocking structure, which is provided with an upper clamping piece positioned on a ground support, a hinge is mounted on the right side of the outer surface of the upper clamping piece, and a lower clamping piece is mounted on the lower surface of the hinge; comprising a locking plate which is installed on the left side of the outer surface of the lower clamping piece, a clamping groove is formed in the inner surface of the locking plate, a locking column is installed on the left side of the outer surface of the upper clamping piece, and meanwhile a nesting groove is formed in the middle section of the inner surface of the locking column. According to the fishing rod support with the reminding and blocking-preventing structure, the upper clamping piece facilitating supporting is arranged, the lower clamping piece is effectively matched with the hinge to be assembled, the fishing rod support is stably assembled on a ground fixing device through the use of a locking plate and a locking column, and the stability between the upper clamping piece and the lower clamping piece is controlled through the use of a clamping groove and a fixing screw; and in cooperation with the supporting frame and the rotating supporting column, stable supporting use is effectively formed through the supporting piece.

The application provides a lithium-rich lithium-iron material, a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The lithium-rich lithium-iron material comprises a core and a coating layer coated on the surface of the core. The material of the core is lithium-rich lithium-iron doped with a first doping element, and the material of the coating layer is carbon material doped with a second doping element. The first doping element comprises at least one of Ti, W, Ni, Ce and Co, and the second doping element comprises at least one of B, N, S, O and P. The lithium-rich lithium-iron material is used as a lithium supplement in a battery, so that the capacity of the battery can be further improved and the gas production amount can be reduced.

The invention discloses a C, N-FeNbO4 / NF microrod based on foamed nickel in-situ 001 crystal face derivation and a derivation method and application thereof, and the method comprises the following steps: in a hydrothermal reaction, hydrolyzing urea to release OH-to replace oxalate in niobium oxalate so as to form a Nb-OH monomer; meanwhile, Fe < 3 + > is hydrolyzed into Fe (OH) 3 colloid; the preparation method comprises the following steps: performing liquid phase nucleation on Nb-OH and Fe (OH) 3 under a hydrothermal condition to form a FeNbO4 precursor, and growing the FeNbO4 precursor on foamed nickel (NF) in situ; in this way, the 001 crystal face of FeNbO4 is accurately regulated and controlled through the strong coordination effect of F <-> to form a rod structure. Under high-temperature (900 DEG C) carbonization, the FeNbO4 is further crystallized into an acid-resistant and alkali-resistant monoclinic crystal type three-dimensional microrod (C, N-FeNbO4 / NF) with C and N co-doped (C, N-FeNbO4) composite NF. According to the method disclosed by the invention, the agglomeration phenomenon of FeNbO4 is relieved; the microrod structure exposes more catalytic active sites, so that the catalytic activity is improved. In addition, the catalyst shows high conductivity by co-doping C and N with synergistic high-conductivity NF. Based on the regulation and control, the C, N-FeNbO4 / NF shows good electrochemical performance in the oxygen evolution reaction.

The utility model provides a fast-assembly cable waterproof joint, which relates to the field of cable waterproof joints, and comprises a base, a binding post, a second threaded pipe, a second elastic body, a first threaded pipe, a first elastic body and two clamping claws respectively fixed at one end of the first elastic body and one end of the second elastic body. And waterproof rubber cores are movably arranged in the two clamping claws. A worker can screw a first elastic body and a first threaded pipe and then screw a second elastic body and a second threaded pipe, clamping claws at one end of the first threaded pipe and one end of the second threaded pipe are extruded, the clamping claws contract inwards and extrude a waterproof rubber core, and the waterproof rubber core contracts to extrude an internal cable; the sealing performance of the waterproof rubber core and the internal cable is improved, shaking and pulling of the cable are reduced, passing of steam is reduced, and the safety in use is greatly improved.

The invention relates to the technical field of rigid-flex board manufacturing, and discloses a rigid-flex board pressing process, which comprises the following steps: S1, material preparation: preparing a flexible circuit layer which is usually made of a polyimide material; preparing a rigid circuit layer, which is usually made of an FR-4 material; an adhesive layer is prepared for bonding the flexible layer and the rigid layer together. According to the invention, the fixing frame and the carrier plate which can be separated are arranged, and when the rigid-flex board is pressed and the carrier part bearing the rigid-flex board drives the rigid-flex board to move towards the blanking direction, the carrier plate gradually moves to a slotting area; therefore, when the carrier plate moves to the slotting area and exceeds the position of the center line of the carrier plate, the carrier plate can rotate towards the lower portion of the fixing frame due to gravity, the pressed rigid-flex board borne by the upper surface of the carrier plate can slide to the upper surface of the material receiving plate along the inclined carrier plate gradually when the carrier plate rotates, and discharging operation is completed.

This application relates to a workbench and PCB processing equipment. The workbench includes a support member, a material support plate, and a first ejector mechanism. The material support plate is connected to the support member and is used to support workpieces. The material support plate has a first through hole. The first ejector mechanism includes an ejector base and a first lifting member. The ejector base is located on the side of the material support plate near the support member and has a mounting groove. One end of the first lifting member is rotatably connected to the mounting groove. The ejector base can move in a second direction to push one end of the first lifting member along the mounting groove, so that the other end of the first lifting member can extend into and protrude from the first through hole to lift the workpiece. This ensures smooth operation of the ejector mechanism and improves production efficiency.

The invention relates to a preparation method and application of a supported cobaltosic oxide catalyst, and the preparation method comprises the following steps: 1) dissolving a cobalt source and a carrier precursor in ethanol and water, adding 2-methylimidazole, stirring, standing, aging, and drying to obtain ZIF-67-based precipitate; and 2) carrying out primary roasting on the ZIF-67-based precipitate in a reducing atmosphere and carrying out secondary roasting in an oxidizing atmosphere in sequence to obtain the supported cobaltosic oxide catalyst, and applying the supported cobaltosic oxide catalyst to the reaction of catalyzing propane to generate carbon dioxide and water. Compared with the prior art, the method for preparing the supported cobaltosic oxide catalyst based on the ZIF-67 not only simplifies the preparation process and reduces the cost, but also remarkably improves the performance of the catalyst, and has important practical significance for improving the efficiency and economical efficiency of a VOCs catalytic oxidation technology; the preparation method provides a new and efficient solution for the development of a VOCs catalytic oxidation technology, and is expected to realize more environment-friendly and more economical VOCs treatment in industrial application.

The utility model discloses a roof steel truss assembly construction structure which comprises an installation platform, a lifting support and a steel truss body, the installation platform is provided with the lifting support, the lifting support is provided with a hydraulic lifter, and the hydraulic lifter is connected with the steel truss body through a steel strand body and a lifting appliance; the steel truss body comprises an upper-layer frame and a lower-layer frame, the lower-layer frame comprises jig frames, longitudinal main beams and connection secondary beams are arranged between the jig frames, and vertical web members connected with the upper-layer frame are arranged at the intersection points of the longitudinal main beams and the connection secondary beams. Temporary supporting rods matched with the lower-layer frame are arranged on the side walls of the vertical web members, and diagonal web members are arranged between the upper-layer frame and the lower-layer frame. The roof steel truss splicing construction structure is ingenious in design and practical in function, and effectively solves the problems that in traditional ground splicing, horizontal steel truss splicing is adopted, components need to be turned over, the cost of construction machinery is high, and the safety risk is large.