55results about How to "Extended operating cycle" patented technology

The invention discloses a detachable traceless silicone rubber creepage-increasing umbrella skirt and processing equipment and a processing technology thereof, and belongs to the technical field of electric insulation accessory processing, the detachable traceless silicone rubber creepage-increasing umbrella skirt specifically comprises an umbrella skirt body, a mounting hole matched with an insulation plate is formed in the middle of the umbrella skirt body, and an interlocking opening communicated with the mounting hole is formed in the umbrella skirt body in the radial direction of the umbrella skirt body; the interlocking opening can realize autonomous closing and locking, and the closed umbrella skirt body forms a complete closed-loop structure; according to the invention, through the arrangement of the interlocking opening, the umbrella skirt body is directly sleeved into the insulating plate and then the interlocking part is buckled during installation, the umbrella skirt body is separated by hands during disassembly, tools are not needed, adhesive residues are avoided, mechanical damage is avoided, detachable traceless installation is truly realized, the insulating plate body is not damaged, and the later maintenance and replacement efficiency is greatly improved.

This invention relates to the field of petrochemical technology, specifically to a method and system for dehydrogenating low-carbon alkanes to olefins. The method includes: (1) introducing low-carbon alkanes into a moving bed reaction zone packed with a dehydrogenation catalyst to undergo a dehydrogenation reaction, obtaining dehydrogenation products, and separating the dehydrogenation products to obtain hydrogen, olefins, and alkanes; (2) introducing the spent catalyst flowing out from the bottom of the moving bed reaction zone into a regenerator for regeneration treatment to obtain a regenerated catalyst, and recycling the regenerated catalyst back to the moving bed reaction zone to participate in the dehydrogenation reaction. Using the method provided by this invention, the conversion rate of low-carbon alkanes can be improved, continuous catalyst circulation can be achieved, and the operating cycle of the unit can be extended.

Embodiments of the present application provide a method and apparatus for generating optimized parameters. The method is suitable for generating optimized parameters related to solder paste printing in surface mount technology. In the method, a cluster parameter model is used to determine whether at least one input parameter deviates from at least one parameter cluster. A global parameter model is used to determine the printing result of a plurality of target parameters in the input parameter. A heuristic algorithm is used to select at least one candidate parameter from the target parameters. An individual parameter model is used to modify the candidate parameter. As a result, the optimized parameters with high operation cycle and low failure rate can be obtained.

This invention discloses a high-gravity oil-solid separation device and method. The device comprises two parts: high-gravity separation and membrane filtration separation. The high-gravity separation part includes a device body, an oil slurry inlet, a diluent inlet, a pipeline mixer, a rotating shaft, a liquid distributor, separation components, a slurry enrichment plate, a heavy phase outlet, a centrifugal pump, a light phase outlet, a motor, and a nitrogen inlet. The membrane filtration separation part includes pipelines and sliding baffles, with the pipelines divided into membrane filtration pipelines and diluent inlet pipelines. This invention first discharges most solid particles through high-gravity separation, and then uses membrane filtration separation to improve the solidification effect, overcoming the limitations of a single separation mode, enhancing the separation effect and long-term operational stability, while simplifying the process flow and saving floor space.

The application discloses a method for sealing coke oven door frame channeling by grouting, which comprises the following steps: firstly, observing the channeling of the coke oven door frame to be repaired, judging the gap state between the coke oven door frame and the protection plate, and determining the channeling position; secondly, removing the T-shaped bolts of the fixed pressing plates adjacent to the upper part and the lower part of the channeling position, and completely covering the channeling position between the upper and lower pressing plates; thirdly, cleaning the installation hole after the T-shaped bolts are removed; fourthly, installing the grouting sealing plate with a grouting pipe and a drainage pipe in the T-shaped bolt installation hole of the upper part and the lower part of the channeling position; fifthly, using a grouting machine to press the sealing grouting material into the gap between the coke oven door frame to be repaired and the protection plate through the grouting pipe in batches until the grouting pipe discharges the grouting material; and finally, completing the sealing grouting of the coke oven door frame channeling. The method overcomes the defects of the traditional coke oven door frame channeling maintenance, reduces the influence on the normal production of the coke oven, avoids damaging the carbonization chamber masonry, improves the maintenance effect and efficiency, reduces environmental pollution, ensures the normal and reliable operation of the coke oven, and prolongs the operation cycle.

The utility model discloses a multilayer combined filter structure of desulfurization dust remover, including tower body, at least one layer composite filler layer is arranged in the tower body, the composite filler layer is multilayer structure, and the regular shaped filler area, transition flow guide area, bulk packing area and support grating from top to bottom include successively, the regular shaped filler area and bulk packing area outside all are provided with fixed frame, the regular shaped filler area and bulk packing area are filled in the corresponding fixed frame respectively, through the high specific surface area of bulk packing, can effectively strengthen gas liquid contact in bulk packing area, improve mass transfer rate, and the low resistance characteristic of regular shaped filler can avoid partial pressure drop surge in regular shaped filler area, realizes the balance of desulfurization efficiency and energy consumption, reduces operating energy consumption while guaranteeing desulfurization effect.

The invention discloses a process method for selective deep desulfurization and denitrification of aromatic-rich fractions. The process method comprises the following steps: (1) mixing aromatic-rich diesel oil with hydrogen, and then feeding the mixture into a pre-hydrogenation reaction zone I for pre-hydrogenation dealkene reaction; (2) a product obtained in the step (1) enters a hydrofining reaction zone II for a hydrofining desulfurization and denitrification reaction; (3) carrying out flash evaporation on the product obtained in the step (2) to separate recycle hydrogen, enabling the obtained refined diesel oil to enter a moving bed adsorption denitrification reaction zone III, and carrying out deep adsorption denitrification reaction on the refined diesel oil under the action of an adsorption denitrification agent to obtain a desulfurized and denitrified refined aromatic-rich diesel oil component; and (4) enabling the inactivated adsorption denitrification agent in the step (3) to enter an adsorbent regeneration area IV, and completing reduction and drying of the inactivated adsorption denitrification agent under the action of a desorption agent to obtain the cyclically regenerated adsorption denitrification agent. According to the process method, deep removal of the sulfur-containing nitrogen-containing compound can be realized, and the investment cost is also greatly reduced.

The utility model relates to the technical field of bag-type dust removers, and discloses a bag-type dust removal connecting structure which comprises a first connecting ring, two connecting blocks are fixedly connected to the inner wall of the first connecting ring, an expansion ring is fixedly connected to the left side of the first connecting ring, and a convex ring is fixedly connected to the left side of the first connecting ring. A second connecting ring is detachably connected to the left side of the first connecting ring, a sealing groove is formed in the second connecting ring, a plurality of first springs are fixedly connected to the inner wall of the sealing groove, sealing rings are fixedly connected to the right sides of the first springs, and a clamping ring is fixedly connected to the interior of the second connecting ring. According to the utility model, dust-containing gas can be effectively prevented from escaping, the clean and safe working environment is guaranteed, the harm of dust to the health of personnel and the surrounding environment is greatly reduced, the stable airflow and pressure environment in the bag-type dust collector can be maintained, the efficient development of dust collection operation is ensured, and the reliable operation cycle and the service life of equipment are prolonged in an assisting manner.

The utility model relates to the field of petroleum chemical technology, concretely relates to a catalyst settlement system stable in operation and good in settlement effect, including clarification mechanism, sludge buffer tank, feed pipeline, sludge tank, backflow pipeline, overflow pipeline, filter press, filtrate tank and sludge discharge pipeline, the clarification mechanism includes a plurality of settlement tanks that are arranged side by side from front to back in proper order and the clarification tank that is arranged at the end of clarification mechanism, the bottom of clarification tank is provided with special ammonium sulfate solution discharge pipeline, is provided with ammonium sulfate solution pump on the ammonium sulfate solution discharge pipeline, the end of ammonium sulfate solution discharge pipeline extends to ammonium sulfate tank area, the outlet end of ammonium sulfate solution pump is equipped with a branch pipeline, this branch pipeline is connected with the feed inlet on the top of filtrate tank through regulating valve, the bottom outlet of filtrate tank is connected with the inlet of clarification mechanism through filtrate pump. The catalyst settlement system is stable in operation, and the downstream device operation cycle is prolonged.

The invention relates to the technical field of petrochemical engineering, in particular to a pre-flash tower bottom oil diversion and emergency oil return system which comprises a switching and shunting module, a pressure mixing module and a cooperative control module. Boosting the pressure of the slurry oil and then dividing the slurry oil into a first branch flow and a second branch flow; the first branch is communicated with a first conveying pipeline, the first conveying pipeline is communicated with a wax oil mixing part, and slurry oil and product wax oil from the vacuum tower are mixed at the wax oil mixing part; the second branch is communicated with a second conveying pipeline, and the second conveying pipeline is communicated with an emergency connector. According to the invention, integrated hardware multiplexing and cooperative control are carried out on the load optimization process and the blockage emergency oil return function of the vacuum tower, and embedded active safety protection is constructed while load reduction and efficiency improvement of the vacuum tower are realized, so that the processing load and operation continuity of the device are systematically improved.

The utility model discloses a protection reactor applied to a hydrotreating reactor, which comprises a feed inlet assembly, a filtration reaction tower, a hydrogenation assembly and a hydrotreating reactor, the feed inlet assembly provides crude oil to be treated for the filtration reaction tower, the hydrogenation assembly provides hydrogen for the filtration reaction tower, the filtration reaction tower is connected with the hydrotreating reactor, and the hydrotreating reactor is connected with the hydrogenation assembly. The filtering reaction tower conveys treated crude oil to the hydrotreating reactor for further reaction, the feed port assembly comprises a first feed port, a second feed port and a third feed port, the filtering reaction tower comprises a first bed layer, a second bed layer and a third bed layer, the first bed layer, the second bed layer and the third bed layer are sequentially arranged from top to bottom, and the first bed layer, the second bed layer and the third bed layer are sequentially arranged from top to bottom. The first feeding hole is connected with the first bed layer, the second feeding hole is connected with the second bed layer, and the third feeding hole is connected with the third bed layer, so that the continuous operation time of the hydrotreating reactor is greatly prolonged.

The invention discloses a waste mineral oil multistage coupling heat exchange and gradient cooling energy-saving cooperative treatment method, which belongs to the technical field of heat energy engineering and energy conservation, and comprises the steps of pretreatment refining, fractionation cutting, molecular distillation, hydrofining, gradient cooling and intelligent control. By constructing a multi-stage coupling heat exchange network, hydrofining high-temperature waste heat is used for preheating fractionation feed, and fractionating tower top steam waste heat is used for preheating molecular distillation feed; cooling the high-temperature material flow according to the temperature by stages through a three-stage gradient cooling system, and recycling the low-temperature cold energy of the molecular distillation unit for a pretreatment process; and dynamically optimizing heat exchange and cooling operation based on an energy balance model through the central control system. According to the method, the technical problems of energy utilization splitting and serious waste heat waste in a waste mineral oil regeneration process are solved, the yield and the quality of a base oil product are greatly improved while the system energy consumption and the cooling water consumption are remarkably reduced, and an innovative solution is provided for efficient regeneration of the waste mineral oil.

The application discloses a novel biogas slurry membrane filtration device based on silicon carbide membranes, comprising: a silicon carbide membrane assembly, which is composed of four groups of membrane groups in parallel connection, and two ends of each group of membrane groups are connected with a shunt pipe and a collection pipe; each group of membrane groups comprises four silicon carbide tubular membrane tubes, and the four silicon carbide tubular membrane tubes are connected in series, each silicon carbide tubular membrane tube is provided with a plurality of large through-hole structures along the axial direction thereof, the diameter of the large through-hole structure is 8 mm, and the pore size of the membrane tube is 150 nm; and a cleaning assembly connected with the silicon carbide membrane assembly and used for cleaning the silicon carbide membrane assembly according to a preset mode. The application has stronger anti-clogging performance, is suitable for anaerobic biogas slurry treatment with high solid content and more organic fiber components, effectively alleviates the problems of scaling and fiber winding and clogging, and solves the problem of membrane strength through the thickening design of the membrane tube spacing.

The utility model relates to the technical field of chemical catalytic reaction equipment provides a kind of for solid particle catalysis suspended state fixed bed reaction device, including reactor, solid particle catalyst layer, Reynolds number control unit and filter screen structure;Solid particle catalyst layer is filled in reactor, and its filling volume occupies 1 / 3~1 / 2 of reactor reaction zone effective volume;Reynolds number control unit is connected with reactor, and filter screen structure is arranged at the top and bottom of the reactor reaction zone.This scheme not only solves the problem of swelling blockage in the application of solid particle catalyst, prolongs the cycle of operation, and the suspended state promotes catalyst and fluid to be in full contact, prevents material short circuit, improves conversion rate, and further inhibits mechanical loss, reduces production cost.

The present application relates to the technical field of industrial water treatment, and in particular to a branched polycarboxylate, a high-temperature-resistant low-phosphorus scale-inhibiting dispersant for grey water and a preparation method thereof.The high-temperature-resistant low-phosphorus scale-inhibiting dispersant for grey water comprises the following raw materials in parts by weight: 6-10 parts of disodium ethylenediaminetetraacetate, 18-22 parts of hydrolyzed polymaleic anhydride, 0.3-0.8 parts of sodium hexametaphosphate, 15-20 parts of sodium polyacrylate, 1.5-2.5 parts of aminotrimethylene phosphonic acid mother liquor, 30-38 parts of branched polycarboxylate and 15-20 parts of deionized water.The obtained scale-inhibiting dispersant can effectively inhibit carbonate scale and sulfate scale, and has good high-temperature stability.

This invention provides a method for preparing a diesel hydrocracking catalyst, comprising the following steps: mixing and kneading a Y-type molecular sieve loaded with a hydrogenation active metal and alumina loaded with a hydrogenation active metal to obtain the final hydrocracking catalyst; wherein the average pore size of the alumina is larger than the average pore size of the Y-type molecular sieve. The catalyst prepared by this method can improve the diffusion performance of macromolecules in low-quality diesel fuel within the molecular sieve channels, enhance catalytic activity, reduce reaction temperature, decrease energy consumption, and extend the operating cycle of the equipment.

This invention relates to the field of catalyst technology, specifically to a solid acid catalyst for post-etherified C4 olefin trimers, its preparation method, and its application. The catalyst comprises at least a metal salt active component, diammonium hydrogen phosphate, and a catalyst support; the metal salt active component includes aluminum sulfate and ferric sulfate; the molar ratio of phosphate ions in the diammonium hydrogen phosphate to metal cations in the metal salt active component is nPO4. 3‑ / n(Al 3+ +Fe 3+ The total amount of metal salt active components and diammonium hydrogen phosphate in the solid acid catalyst accounts for 5-10% of the total mass of the solid acid catalyst. By optimizing the formulation and process of the solid acid catalyst, the problems of easy mudding and clogging of existing solid phosphoric acid catalysts, easy carbon deposition and deactivation of molecular sieve catalysts and complex process operation, and high cost of ionic liquid catalysts are effectively solved, so as to better meet the production and application needs of post-etherified C4 olefin trimers.

This utility model discloses a treatment device for mitigating coking of atmospheric residue oil, belonging to the field of petroleum processing technology. The device includes a vacuum furnace and a vacuum tower. The vacuum tower has a packing layer inside. Its key feature is that it further includes a hydrogenation reactor and a gas-liquid separator. The outlet of the vacuum tower is connected to the inlet of the hydrogenation reactor via a pipeline. The outlet of the hydrogenation reactor is connected to the inlet of the gas-liquid separator via a pipeline. The liquid phase outlet of the gas-liquid separator merges with the atmospheric residue oil feed stream and is then connected to the inlet of the vacuum furnace via a corresponding pipeline. The outlet of the vacuum furnace is connected to the inlet of the vacuum tower via a pipeline. This utility model, by adding a hydrogenation reactor and a gas-liquid separator and reorganizing the pipeline connections, allows the wash oil to be pretreated before mixing, fundamentally improving the thermal stability of the oil, reducing the coking tendency of the residue oil, and extending the operating cycle of the device.

The invention discloses a precision treatment system self-adaptive operation system and method based on a water quality prediction model, and the system is characterized in that an outlet of a condensate pump is communicated with an inlet of a monitoring and water quality prediction system, a thermodynamic system, an inlet of a first precision treatment mixed bed, an inlet of a second precision treatment mixed bed and an inlet of a third precision treatment mixed bed; an outlet of the monitoring and water quality prediction system is communicated with a water quality monitoring index instrument, an outlet of the first fine treatment mixed bed, an outlet of the second fine treatment mixed bed and an outlet of the third fine treatment mixed bed are communicated with a thermodynamic system, and first fine treatment resin regeneration degree detection equipment is arranged on the first fine treatment mixed bed; according to the system and the method, the operation problem caused by frequent regeneration due to the fact that the hydrogen type operation cycle is too short can be solved, and meanwhile the situation that water quality deterioration is prone to occurring during ammonium type operation is solved.

The application discloses a kind of RTO device assembly construction methods, and the risk of cross operation is reduced by specification process.Its core steps include: first, bottom air pipe, steel support and platform installation are carried out;Then hoist lifting valve, gas collecting chamber, heat storage chamber in turn;In heat storage chamber, fill heat storage ceramic according to the structure of "bottom ceramic square saddle ring, multilayer MLM honeycomb ceramic module, top square saddle ring";Hoist combustion chamber, burner again;Finally, install fan, air pipe and accessory structure.The air pipe welding adopts inside and outside mouthpiece fixed weld, effectively control gap and deformation.The method makes construction more standardized and efficient, reduces the risk of cross operation, improves the heat storage efficiency and is suitable for large RTO project.

The application discloses a kind of for crude benzene full fraction and / or coal-based light hydrocarbon hydrogenation processing method, under the condition of 4~15Mpa, make reaction raw material sequentially through first-stage hydrogenation reaction, secondary hydrogenation reaction and tertiary hydrogenation reaction step.Wherein, first-stage hydrogenation reaction is liquid phase prehydrogenation, selects first NiMo catalyst;Secondary hydrogenation reaction is gas-liquid two-phase hydrogenation, selects second NiMo catalyst;Tertiary hydrogenation reaction is gas-phase hydrogenation, selects at least one of third NiMo catalyst, CoMo catalyst and NiMoW catalyst.The application adopts reasonable catalyst grading scheme and appropriate process condition, without carrying out heavy removal pretreatment to crude benzene, reduce the energy consumption required in processing process.

The present application belongs to the technical field of slurry bed hydrogenation, and discloses a residual oil processing system and method. The system comprises a residual oil hydrogenation reaction device, an oil-gas separation unit, an atmospheric distillation unit, a vacuum distillation unit and a raw oil feeding pipeline. The present application has the technical characteristics of simple structure, improved economic benefits, reduced investment cost and device operation energy consumption, etc.

This utility model discloses a cyclone separator for a biomass circulating fluidized bed boiler, comprising a flue gas inlet section, a gas-solid two-phase separation section connected to the flue gas inlet section, a flue gas outlet section connected to the top and bottom of the gas-solid two-phase separation section respectively, and a solid return section. The solid return section includes multiple coaxially connected and fixedly connected solid return straight sections and multiple solid return conical sections, which are arranged at intervals in the vertical direction. Flue gas flows in from the flue gas inlet section, rotates along the inner wall of the gas-solid two-phase separation section, and achieves gas-solid two-phase separation through centrifugal force. The gas phase flows out through the flue gas outlet section, and the solid phase is returned from top to bottom through the solid return section. Through segmented and optimized solid return path and gas-solid separation flow field, the intermittent blockage problem caused by alkali metal adhesion in traditional cyclone separators is solved, avoiding forced boiler load reduction or shutdown. It is especially suitable for biomass combustion scenarios with complex fuel types and variable ash composition.

The invention discloses a plate type falling film evaporator. The evaporator comprises an evaporator tank body, a feed liquid evaporation plate device, a feed liquid distribution device, a feed liquid circulating device, a steam discharging device and a feeding pipeline, the feed liquid evaporation plate device comprises an evaporation plate mechanism, a fixed bracket, a descaling connecting frame and a descaling metal strip; a liquid film evaporation area is formed through the feed liquid evaporation plate device, uniform liquid distribution is achieved through the feed liquid distribution device, non-evaporated feed liquid flows back through the feed liquid circulation device, secondary steam is discharged through the steam discharging device, and raw materials are supplemented through the feeding pipeline; the thermal expansion coefficient of the descaling metal strip is larger than that of the evaporation plate mechanism, micro displacement is generated during heating or the descaling metal strip abuts against and slides to disturb the plate face, scale layer attachment is damaged, the scale layer is promoted to fall off, automatic reset is achieved during cooling, and self-adaptive descaling without external force driving is achieved. Passive scale removal is achieved through the thermal expansion difference, the heat transfer efficiency is improved, the operation period is prolonged, and the cleaning frequency and the maintenance cost are reduced.

The invention relates to a spraying system for removing sediments in a pre-condenser in naphthalene-process phthalic anhydride production, and relates to the technical field of naphthalene-process phthalic anhydride production, the spraying system comprises a pre-condenser body, a gas-liquid separation device, a crude phthalic anhydride intermediate tank and a switching condenser, the surface of the pre-condenser body is provided with a first conveying pipe, and the first conveying pipe is provided with a second conveying pipe; a filtering assembly is arranged on the surface of the first conveying pipe, a connecting pipe is arranged at the other end of the first conveying pipe, the other end of the connecting pipe is arranged on the surface of the gas-liquid separation device, and a liquid phase pipe and a gas phase pipe are arranged on the surface of the gas-liquid separation device; by integrating the pre-condenser body, the gas-liquid separation device, the crude phthalic anhydride intermediate tank and the switching condenser, a complete gas-liquid separation and circulating spraying system is constructed, the efficiency and stability of the crude phthalic anhydride condensation process can be remarkably improved through the synergistic effect of all the components, and gas and liquid can be efficiently separated and impurities can be intercepted through the combination of the gas-liquid separation device and the filtering assembly.

The present application relates to a kind of methyl hexahydrophthalic anhydride preparation method, comprising the following steps: with the refined methyl tetrahydrophthalic anhydride that is not isomerized as raw material, raw material and hydrogen are sent into ebullated bed hydrogenation reactor, then special catalyst is added to carry out hydrogenation;Waste hydrogen and methyl tetrahydrophthalic anhydride light component are taken out by gas phase from the top of reactor, waste catalyst is taken out from the bottom of reactor, and the hydrogenation product crude methyl hexahydrophthalic anhydride is taken out by pump control liquid level from the side of reactor;Crude methyl hexahydrophthalic anhydride is sent into the separation device with thin film evaporator and is subjected to vacuum distillation, and finished product methyl hexahydrophthalic anhydride is obtained.The catalyst used in the present application has moderate activity, high hydrogenation efficiency;Catalyst and product have no separation process, less loss, low safety risk;Post-treatment process has high heat transfer efficiency, short residence time, low colority;Product has less by-product, high yield, stable acid value and anhydride group content, and excellent performance.

This invention provides a grouped self-cleaning aeration and fluidization system, relating to the field of wastewater treatment aeration technology. It includes: a dissolved oxygen sensor, an intelligent control box, a blower, and grouped aeration modules. The intelligent control box includes a power distribution module, a control and protection module, a PLC control module, a cloud-based IoT gateway module, and a data acquisition module. The grouped aeration modules include multiple aeration units; each aeration unit includes multiple independent microporous hoses, hose fixing brackets, and butterfly valves. The dissolved oxygen sensor is connected to the PLC control module. The PLC control module, blower, and grouped aeration modules are connected sequentially. The PLC control module is connected to the butterfly valves. The PLC control module controls the opening and closing of the butterfly valves, performing self-cleaning and starting / stopping the grouped aeration modules. This invention can form directional water flow, achieving full-pool aeration and fluidization, preventing sludge accumulation at the bottom of the pool, and improving sludge suspension and oxygen transfer efficiency.

This invention provides a method for preparing a diesel hydrodewaxing catalyst. The catalyst contains ZSM-5 molecular sieve and alumina, wherein the average pore size of the alumina is higher than that of the ZSM-5 molecular sieve, generally 2-15 nm higher, preferably 4-10 nm. The method for preparing the catalyst includes the following steps: (1) Selecting or preparing ZSM-5 molecular sieve 1 and introducing a hydrogenation active metal into ZSM-5 molecular sieve 1; (2) Selecting or preparing ZSM-5 molecular sieve 2 and introducing a hydrogenation active metal into ZSM-5 molecular sieve 2; optionally, (3) Selecting or preparing alumina and introducing a hydrogenation active metal into alumina; (4) Mixing and molding the materials obtained in steps (1), (2) and (3) to obtain the final diesel hydrodewaxing catalyst. The catalyst can reduce the reaction temperature and extend the operating cycle of the device.

The application discloses a blade-adjustable plate strip shearing flying shear which comprises a blade shaft, a blade, a blade clamping device and a blade adjusting assembly; the blade is fixed in a blade mounting groove arranged on the outer circle of the blade shaft through the clamping device; the blade adjusting assembly comprises an adjustable height component which is arranged at the bottom of the blade mounting groove and is used for supporting the blade and can be controlled in height so as to adjust the extension length of the blade; a plurality of groups of blades can be arranged, the used blade is adjusted to the working height, and the heights of the remaining blades are reduced to not interfere with the use of the working blade; the plurality of groups of blades can be straight blades, concave-convex blades and concave-convex blades with different shapes, or blades with the same function can be arranged, in the case that one group of blades is damaged, another group of blades can be used without replacement, the blades can be selected and used according to the requirement without dismounting and replacing, the operation cycle of the flying shear is greatly prolonged, the consumption of manpower, material resources and energy is reduced, and the production efficiency is improved.