50results about How to "Kill two birds with one stone" patented technology

A crack arrest process and device thereof for removing fine cracks on alloy surfaces, relates to laser impulse processing application technique field. Oxide layers and pollutants on alloy surfaces which affect surface bonding force are removed to obtain good glue-joint strength and permanent stability; a flexible film is adhered to the alloy surface as a crack arrest patch, and a layer of black lacquer coating is applied on the crack arrest patch; laser pulse with following parameters: pulse energy of 15-40J, pulse width of 20-30ns, light spot size of 4-10mm, repetition frequency of 0.5-10Hz is selected to performing laser impact crack arrest according to damage status of the cracks; laser crack arrest is performed by selecting crack arrest route, and crack effects are inspected by using no-damage technique during crack arrest process. The invented method and device can increase alloy surface fatigue threshold value, the existing of residual compressive stress on metal surface after laser impulse enhances fatigue threshold stress on material surface greatly.

The invention belongs to the technical field of cement production, and particularly relates to a reducing hexavalent chromium type grinding aid and a preparing method thereof. In an existing cement chromium removal technology, ferrous sulfate is prone to being oxidized by oxygen in air and losing efficacy under the conditions of high-temperature grinding and long-term storage, hexavalent chromiumis not completely removed, and a large amount of water-soluble hexavalent chromium is still left in cement and probably causes harm to a contact human body. By means of the technical scheme, the method includes the following steps of firstly, evenly mixing a solution of grinding aid components and ferrous sulfate wrapping an organic protection layer in proportion; secondly, preparing a sodium citrate solution; thirdly, adding ascorbic acid to a mixed solution obtained in the first step to be sufficiently dissolved, and adding the sodium citrate solution obtained in the second step under the heating condition to be evenly stirred to obtain the grinding aid. The grinding aid is suitable for the cement grinding process.

The invention relates to a method for preparing a polyvinyl alcohol nano fibrous membrane containing nano silver and amino acid, which comprises the following steps: dissolving polyvinyl alcohol in a mixed solution of formic acid and deionized water, adding into a two-fluid beaming electrostatic spinning pouring pipe A, adding a complex solution generated from amino acid and silver ion into a two-fluid beaming electrostatic spinning pouring pipe B, gathering the two solutions in a sprayer C under the action of gravity, connecting a high-voltage generator to carry out electrostatic spinning while controlling the voltage at 15-20 KV, and receiving fibers with a metal flat plate; and crosslinking the received fibers in formaldehyde and concentrated acetic acid gas phase, and meanwhile, reducing the silver ion in silver histidine to obtain the nano silver, wherein the obtained nano fiber is hydrophilic, but can be easily dissolved in water. The preparation method provided by the invention is simple and high in yield; and the nano fibrous membrane has the advantages of high stability, high mechanical properties and favorable antimicrobial property, and can be used in the fields of medical treatment, cosmetics, food and the like.

The invention discloses a culturing method for transplanting dendrobium officinale to old fruit trees in a parasitic mode and belongs to the technical field of planting plants. The culturing method comprises the steps of culturing seedling tissues, hardening the tissue culture seedlings and transplanting the seedlings to the old fruit trees in the parasitic mode for culturing. The step of hardening the tissue culture seedlings comprises the steps of selecting the bottled tissue culture seedlings, preparing matrixes for culturing the young seedlings, applying fertilizer, carrying out field planting and carrying out field planting management; the step of transplanting the seedlings to the old fruit trees in the parasitic mode comprises the steps of selecting the young dendrobium officinale seedlings, the old host fruit trees and culturing fields of the old host fruit trees, adopting a transplanting method and carrying out culture management. The culturing method solves the prevailing problems that due to the special natural growing environment of the dendrobium officinale, manual culturing is difficult to carry out, the survival rate of transplanting is low, the product quality is not ideal and the planting cost is high, land and space are fully utilized, operation and management are easy to carry out, resource materials are saved, manpower and material resources are saved, and good economic benefits and social benefits are achieved.

The invention relates to a foamed plastic sheet material prepared from waste and old polypropylene and rubber, and preparation method thereof. Ingredients of the foamed plastic sheet material comprise 80-100 parts of waste and old polypropylene film, 15-40 parts of modifier, 4-10 parts of foaming agent, 0.5-1.5 parts of cross-linking agent, 40-110 parts of filler and 0.5-1 part of crosslinking auxiliary agent. The preparation method comprises steps of: adding waste and old polypropylene, a modifier and a filler in a mixing roll according to measurement, plasticating and adding a foaming agent for mixing; then adding a cross-linking agent and a crosslinking auxiliary agent, mixing and crosslinking for moulding; and putting a mixture into an extruder for extrusion, and foaming and fixing in a hot pressing moulding machine. The foamed plastic sheet material of the invention employs the waste and old polypropylene as a base-material, and is modified by the waste and old rubber powder and moulded through a crosslinking foaming, so as to prepare an ideal foam sheet material whose physical and mechanical property is near to that of a product made from a fresh material. In addition, the method has advantages of easily available raw materials, simple operation, no 'three wastes (waste gas, waste water and industrial residue)' discharge, etc., and has substantial economic benefits.

The invention discloses a method for continuously extracting flaxseed gum and lignan from flaxseed husks. The method comprises the following steps of 1, crushing flaxseed husks, adding a certain amount of water into the crushed flaxseed husks, stirring with heating until water boiling, and carrying out solid-liquid separation at a water boiling point, 2, concentrating a liquid phase separated by the step 1, adding a certain amount of alcohol into the concentrated solution, stirring and carrying out solid-liquid separation, 3, drying a solid phase separated by the step 2, crushing to obtain flaxseed gum, and recovering alcohol for next treatment, 4, adding alcohol separated by the step 2 into a solid phase separated by the step 1, carrying out dilution, stirring, and carrying out solid-liquid separation, and 5, transferring the alcohol recovered by the step 3 and a liquid phase separated by the step 4 into an alcohol rectifying tower, recycling a distillate of high-concentration alcohol, collecting a rectifying product liquid, adding an inorganic alkali solution into the rectifying product liquid for alkaline hydrolysis, adjusting a pH value of alkaline hydrolysis products to 7 by an inorganic acid, and carrying out concentration, drying and crushing to obtain lignan extract. The method has a high extract yield, a low production cost and no pollution on the environment, and realizes high efficiency, continuous extraction, time saving and labor saving.

The invention belongs to the technical field of low-temperature equipment, and discloses a connecting shaft structure of an external work output connection device of a turbine expansion engine. The external work output connection device of the turbine expansion engine includes a connecting sleeve, which provided with a sleeve cavity and of which connecting shaft support mechanism cavities formed at the middle parts at the two ends respectively, a left flange plate, a right flange plate, a pair of connecting shaft support mechanisms, and a pair of seal ring seats. The connecting shaft structure includes a connecting shaft supported on the connecting shaft support mechanisms, wherein air inlets are formed in the connecting sleeve and provided with inlet channels; return-air holes are formed in the connecting sleeve; oil inlet holes are formed at the two ends of the connecting sleeve and provided with oil inlet channels; a return-oil hole is formed on one side of the connecting sleeve; oil gaps are formed between the connecting shaft support mechanisms and the seal ring seats; and the two ends of the connecting shaft form a seal gasket matching section. The connecting shaft structure is characterized in that an oil slinger is formed on the connecting shaft and forms an oil throwing groove with one end of the bearing sleeve matching section, and has the advantages that the lubrication and sealing effects are integrated.

The invention discloses a treble PCR method for simultaneously detecting mycoplasma hyopneumoniae, porcine pasteurella multocida and haemophilus parasuis. A treble PCR detection method for directly detecting 3 pathogens once from a sample is established through the following steps: firstly, screening out conservative genetic fragments with the gene type characteristics of the pathogens, using the conservative genetic fragments as 3 gene target points for PCR detection, respectively synthetizing and amplifying primers of the target point genes, and then putting 3 pairs of the primers of the 3 genetic fragments in a PCR reaction system. Through the adoption of the treble PCR method disclosed by the invention, on one hand, the pathogens can be accurately detected, and a mixed infection condition can be analyzed, so that the epidemic and development trend of an epidemic situation can be controlled, and the treble PCR method has double effects; on the other hand, compared with the conventional PCR method, the detecting time is shortened by 24 hours, so that the purpose of quickly detecting actual samples is achieved, and the cost is reduced.

The invention relates to a deep moisturizing gentle shower gel and a preparation method thereof. The deep moisturizing gentle shower gel comprises the following raw materials and components in percentage by weight: 9% to 15% of an amino acid surface active agent, 1% to 1.7% of a thickening agent, 3% to 15% of a humectant, a pH conditioning agent which enables the pH value of the deep moisturizinggentle shower gel to be 7.3 to 7.9 and the balance of deionized water. The preparation method comprises the following steps: adding the thickening agent and the humectant into the deionized water, stirring and mixing to form a thick liquid, then adding the amino acid surface active agent, adding the pH conditioning agent, and mixing uniformly to obtain the deep moisturizing gentle shower gel. Thedeep moisturizing shower gel disclosed by the invention is high in cleaning capability, easy to wash and free of residue after washing, and the skin is moistened and smooth.

A dry spiral vacuum pump without environmental pollution is disclosed. Its rotor (spiral thread) has a pair of left and right spiral thread whose teeth shape is composed of quimby, quasi-Archimedes curve and arc curve. Its number of leads is more than 2. The internal space of pump is divided into more than 2 oil-dosing chambers. When rotor is rotating, the oil-closing chamber moves from suction side to discharging side. On the side wall of pump body has a air suction hole which is communicated with the second oil-clasing chamber from the discharging side. The position of said suction hole most ensure the longest open time of the second oil-closing chamber for introducing cold air to cool and discharging dust.

The invention relates to magnetic adsorption units and a magnetic adsorption caterpillar. The magnetic adsorption units comprise substrates, magnets and antiskid pads are fixed to one sides of the substrates, driving chains and guide anti-fall caterpillar mechanisms are arranged at the other sides of the substrates, each guide anti-fall caterpillar mechanism comprises two columns symmetrically arranged on the substrate, and the columns are provided with rotatable guide covers. The magnetic adsorption caterpillar comprises several magnetic adsorption units, bending plate chain joints are fixedto the two sides of each guide anti-fall mechanism respectively, and the magnetic adsorption units are mutually connected through the bending plate chain joints to constitute the magnetic adsorption caterpillar. Every two columns form each clamping mechanism, each clamping mechanism is used for clamping each guide plate, through the arrangement of guide covers, friction between the guide covers and the guide plates is reduced, running is smooth, and on one hand, it can be guaranteed that the caterpillar runs steadily and stably; on the other hand, the caterpillar can be prevented from being separated out from conveying wheels. A magnetic adsorption caterpillar wall climbing robot can have a high load bearing capability, the load bearing capability is 150 kg or above, and the wall climbingrobot is driven to be applied in the industrial level.

The invention provides a tandem multistage continuous rectification solvent recoverer, which comprises a high level metering tank, a first reboiler, a first rectifying tower, a first condenser, a vapour-liquid separator, a tail gas cooler, a second reboiler, a second rectifying tower, an inner separator, a reverse flow tube, a flow guide tube, a third rectifying tower, a second condenser, a rotorflow meter and a circulating pump. By the device, the problem of the limitation on a separation and recovery range of a solvent is solved. The tandem multistage continuous rectification solvent recoverer has a compact structure, low original cost, small occupied area, small occupied space and a small manual operation range, is easier to operate and has the greatest advantages that: on the basis of the prior art, the height of the rectifying tower is lowered and the solvent can be separated without an overhigh rectifying tower body; the tandem multistage continuous rectification solvent recoverer has higher purity than the conventional equipment; and the equipment can achieve an ideal separating effect on any separable organic solvents and the process requirement states can be achieved under the condition that the solvent does not flow back.

The invention discloses a nuclear-irradiation-resistant reinforced high-temperature-resistant resonant quartz temperature sensor, and relates to the field of resonant temperature sensors and is composed of an integrated packaging part and a thermosensitive quartz resonator, the thermosensitive quartz resonator is located inside the integrated packaging part, and the integrated packaging part is composed of a Kovar alloy pipe cap and a Kovar alloy pipe seat, and tungsten copper layers are sputtered on the inner and outer surfaces of the Kovar alloy pipe cap; a surface shear vibration mode and fundamental wave working are adopted by the thermosensitive quartz resonator, m is equal to 0.76 n, m and n are the width and the length of an alloy film oscillation excitation area, the thermosensitive quartz resonator is composed of a first multi-layer special alloy film oscillation excitation area, a second multi-layer special alloy film oscillation excitation area, a first supporting piece, a second supporting piece, a resonance component, a first bus bar electrode and a second bus bar electrode. The quartz temperature sensor has the advantages that the distance between the thermosensitive resonator and the peripheral circuit can be larger than or equal to 5 m, and the quartz temperature sensor is wide in working temperature range, high in accuracy, excellent in linearity, good in long-term stability, high in nuclear radiation resistance and good in high temperature resistance.

The invention discloses a steering wheel zero offset self-learning unmanned vehicle trajectory tracking method. The method comprises a road line type fitting algorithm, a steering wheel zero offset estimation algorithm and a vehicle kinematics model control algorithm. The road line type fitting algorithm uses a section of expected road point sequence in front of a vehicle as input to fit road linetype parameters. Steering wheel zero offset is estimated by a steering wheel zero offset estimation algorithm according to the current and historical road line type parameters. A vehicle kinematics model control algorithm is combined with the road line type parameters, the steering wheel zero offset and the vehicle kinematics model to calculate and output a steering wheel angle for vehicle trajectory tracking control. The method aims to improve the intelligent level of unmanned vehicle trajectory tracking control and improve the tracking precision.

The invention relates to a water-cellars-containing forest fire prevention isolation belt considering fire fighting and irrigation functions. The forest fire prevention isolation belt is characterized in that a plastic film (2) covers a fire prevention isolation belt (1); ditches (3) are arranged at the two sides of the fire prevention isolation belt (1); and a plurality of water cellars (4) are arranged beside the ditches (3). The forest fire prevention isolation belt has fire fighting and irrigation functions.

The invention provides a back-pressure exhausting pipe capable of generating power, belongs to the technical field of automobiles, and solves technical problems that an existing back-pressure exhausting pipe is poor in back pressure effect, and energy of exhausted gas cannot be utilized completely. The back-pressure exhausting pipe capable of generating power comprises a front-segment pipe connected with an engine, a rear-segment pipe connected with a silencer, a first manifold and a second manifold. The inlets of the first manifold and second manifold are both communicated with the outlet of the front-segment pipe, and the outlets of the first manifold and second manifold are communicated with the inlet of the rear-segment pipe; an impeller is arranged in the first manifold and is connected to an engine, and a shutter capable of closing the inlet of the second manifold is arranged in the second manifold. The back-pressure exhausting pipe has the advantages of good back pressure effect, complete use of the energy of the exhausted gas and the like.

The invention relates to an anti-blocking desalting device and method. The device mainly comprises a device shell and a device internal component, the internal component comprises a guide structure on the inner side of the device, a hollow cylinder concentric with the device shell and an umbrella cap located on the upper portion of the hollow cylinder, a buffer area and a gas distributor are arranged at the bottom of the device, and an inner cylinder is arranged in the buffer area; and liquid distributors are arranged at the bottom ends of the two sides of the shell, and waste water symmetrically enters a ring system between the buffer area inner cylinder and the shell. When the device and the method are particularly used for desalting high-salinity wastewater, the requirement of long-period stable operation can be met, salt in the wastewater can be efficiently removed, and the problems of difficulty in desalting the high-salinity wastewater, easiness in blockage and the like are solved.

The invention provides a method for rapidly obtaining a high-nicotine tobacco mutant by screening tobacco root systems. Yunyan 87 mutation second-generation seeds and Yunyan 87 control seeds are subjected to spot seeding respectively, after the Yunyan 87 control seeds grow out two true leaves, Yunyan 87 mutation second-generation materials and Yunyan 87 control material seedlings are pulled out and cleaned to compare the root systems, and a mutant material KH65 with the more developed root systems is screened out and cultured and transplanted; after tobacco plants are mature, upper, middle andlower tobacco leaves are sampled to measure the nicotine content of a single plant KH65; after the tobacco plant KH65 blooms, selfing is conducted to collect seeds, and the seeds are sown again in the second year; the root system conditions of the mutant material are identified again, and after the tobacco plant is mature, sampling is conducted again to measure the nicotine content of the maturemutant material of the single plant; after the mature mutant tobacco plant grow to bloom, selfing is conducted to collect seeds, and the high-nicotine tobacco mutant is obtained. According to the method, the tobacco mutant material high in nicotine content can be rapidly identified and obtained by screening the root expression of the tobacco EMS mutant material.

The invention discloses a method for continuously extracting flaxseed gum and lignan from flaxseed husks. The method comprises the following steps of 1, crushing flaxseed husks, adding a certain amount of water into the crushed flaxseed husks, stirring with heating until water boiling, and carrying out solid-liquid separation at a water boiling point, 2, concentrating a liquid phase separated by the step 1, adding a certain amount of alcohol into the concentrated solution, stirring and carrying out solid-liquid separation, 3, drying a solid phase separated by the step 2, crushing to obtain flaxseed gum, and recovering alcohol for next treatment, 4, adding alcohol separated by the step 2 into a solid phase separated by the step 1, carrying out dilution, stirring, and carrying out solid-liquid separation, and 5, transferring the alcohol recovered by the step 3 and a liquid phase separated by the step 4 into an alcohol rectifying tower, recycling a distillate of high-concentration alcohol, collecting a rectifying product liquid, adding an inorganic alkali solution into the rectifying product liquid for alkaline hydrolysis, adjusting a pH value of alkaline hydrolysis products to 7 by an inorganic acid, and carrying out concentration, drying and crushing to obtain lignan extract. The method has a high extract yield, a low production cost and no pollution on the environment, and realizes high efficiency, continuous extraction, time saving and labor saving.

The invention relates to a multifunctional shock absorption carpet which comprises a carpet body, a shock absorption air cushion, an alarm, wires, a power supply, a micro switch and a switch. The shock absorption air cushion is arranged at the bottom of the carpet body. When a user exercises on the carpet body, the shock absorption air cushion can play a good shock absorption effect, the noise generated during the exercise can be lowered, and safety of the ankles and other parts of the user also can be protected. In addition, the alarm is mounted on the carpet body and connected to the power supply, the micro switch and the switch through the wires. Moreover, the alarm, the power supply, the micro switch and the switch form an intact closed loop. When the user wants to sleep, the user can turn on the switch; when a thief breaking in a house for theft passes the carpet body, the micro switch will be triggered, the alarm is made to send out a warning sound, and therefore a good anti-theft effect can be achieved.

The invention provides a fruit juice facial mask container comprising a facial mask holding cavity. When the facial mask holding cavity rotates relative to a container body, a barrier film is gashed, so that the container body communicates with the facial mask holding cavity, and a fruit juice facial mask is formed. In addition, whether the facial mask is used can be selected. When the facial mask is selected to be used, except fruit juice wetting the compressed facial mask, the rest fruit juice can be drunk, and the problem of waste does not exist. In addition, the fruit juice facial mask container is similar to a common beverage bottle in size and carrying method, meanwhile, the drinking fruit juice can also form the fruit juice facial mask, carrying is convenient, two effects can be achieved through the single fruit juice facial mask container, and the fruit juice facial mask container is a very convenient object for leisure tourism.

The invention discloses a ginkgo fruit composite preservative and a preservation method. The ginkgo fruit composite preservative comprises a film coating agent, an antibacterial agent and a fumigation agent, wherein each liter of the film coating agent comprises the following components in parts by weight: 10-15g of chitosan, 0.2-0.5g of nano-SiO2, 15-18g of glycerine and solvent, namely acetic acid in the volume concentration of 10%; each liter of the antibacterial agent comprises the following components in parts by weight: 0.1-0.5g of ginkgo exocarp ethanol extract and the solvent, namely water; each liter of the fumigation agent comprises the following gas components: 0.5-1.0mu L of 1-methyl cyclopropene and the balance of air. By using the composite preservative for treating ginkgo fruits, the mildew phenomenon of the ginkgo fruits during the storage period can be effectively inhibited, the problem of water loss of the ginkgo fruits can be simultaneously greatly reduced, the storage and preservation period of the ginkgo fruits can be prolonged to the greatest extent, the fruit hardening of the ginkgo fruits can be prevented and the occurrence of calcification phenomenon can be also prevented.

The invention relates to high-strength steel with a nanometer, layered and metastable skeletal structure. The steel is prepared from the alloy components in percentage by weight: C: 0.01 to 0.1%, Mn:7.0 to 11.0%, Cu: 1.5 to 4.0%, Ni: 1.0 to 3.0%, Al: 1.0 to 2.0%, and the balance of Fe. The invention further relates to a method for preparing the high-strength steel with the nanometer, layered andmetastable skeletal structure. The method comprises the steps of weighing alloy components, smelting, casting, forging, hot rolling, cold rolling and heat treating process. The purpose of the invention is to provide the high-strength steel with the nanometer, layered and metastable skeletal structure and a preparation method thereof. The material has excellent mechanical properties, low productioncost, wide process window, and has a huge application prospect.

The invention discloses a high-transport-capacity and high-efficiency rail transport vehicle and a totally-closed breeding system. The system comprises at least one breeding area used for breeding livestock and a rail transport vehicle connected with the breeding area. According to the invention, by arranging the rail transport vehicle to transport livestock in the breeding area, on the one hand, the working efficiency of transportation is improved; on the other hand, compared with transportation through a motor vehicle, the rail transportation vehicle is used for reducing dust generated in the transportation process in the breeding area, healthy growth of livestock in the breeding area is protected, the morbidity rate of the livestock is reduced, and the yield of the livestock is increased.

The invention discloses an energy-saving acetic ester refining method. The method is characterized in that a pressure regulation valve is arranged at the top of a head oil tank; low-boiling point components in a system are intermittently discharged to a recovery system for treatment; a gas phase at the top of a fractionating tower is used for heating primary ester feed from an esterification tower or a washing tower to convert the primary ester feed into two parts, i.e. a gas phase and a liquid phase; the afterheat of steam is used for heating the liquid phase part of the primary ester feed subjected to primary heat exchange to gasify a part of the liquid phase; the gas phase and liquid phase of the primary ester feed enter different proper positions of the fractionating tower respectively; an oil phase of head oil which is subjected to phase separation is subjected to heat exchange with a finished product discharged from the bottom of the fractionating tower to be heated to temperature matched with the gas phase at the top of the fractionating tower, and enters an inlet in the upper part of the fractionating tower for refluxing. According to the method, low-boiling point impurities in the system can be released in time, the energy consumption of a refining process can be lowered, the energy consumption of a unit weight of product can be lowered by 5 to 20 percent, and the product obtained by the method is high in purity.

The invention relates to a method for preparing a polyvinyl alcohol nano fibrous membrane containing nano silver and amino acid, which comprises the following steps: dissolving polyvinyl alcohol in a mixed solution of formic acid and deionized water, adding into a two-fluid beaming electrostatic spinning pouring pipe A, adding a complex solution generated from amino acid and silver ion into a two-fluid beaming electrostatic spinning pouring pipe B, gathering the two solutions in a sprayer C under the action of gravity, connecting a high-voltage generator to carry out electrostatic spinning while controlling the voltage at 15-20 KV, and receiving fibers with a metal flat plate; and crosslinking the received fibers in formaldehyde and concentrated acetic acid gas phase, and meanwhile, reducing the silver ion in silver histidine to obtain the nano silver, wherein the obtained nano fiber is hydrophilic, but can be easily dissolved in water. The preparation method provided by the invention is simple and high in yield; and the nano fibrous membrane has the advantages of high stability, high mechanical properties and favorable antimicrobial property, and can be used in the fields of medical treatment, cosmetics, food and the like.

The invention relates to a powder adding device used for printer powder adding. The powder adding device comprises a working segment, a connecting segment and a holding segment, wherein the connecting segment is positioned between the working segment and the holding segment; the projection, on a plane A, of the working segment is a projection A, the plane A is a plane arranged vertical to a direction f, and the direction f is a height direction of the powder adding device; the projection, on the plane A, of the holding segment is a projection B; the shape of the projection A is the same as that of a diagram N1; the diagram N1 is obtained by deforming a diagram M1 through the following method: the diagram M1 is an equilateral triangle including a side a1, a side b1 and a side c1, the side c1 of the equilateral triangle is bent towards the interior of a triangle to form an arc-shaped arc edge c1', and the diagram obtained after circular bead processing is carried out at the joint of the side a1 and the side b1 is the diagram N1. Through the scheme, when the powder adding device is inserted into a novel toner bottle for adding toner into a toner cartridge, the problem of toner blockage can be effectively solved, and the problems of pollution and waste caused by the fact that outside leakage appears during toner adding are avoided.

The invention discloses a shear type folium mori picking device which comprises a shear knife assembly. The shear knife assembly comprises a vertical blade, a rotary blade, a slide bar, a slide block,a rotating shaft II and a connecting rod II; the vertical blade is mounted on the slide bar through the slide block, a crankshaft is arranged at one end of a transmission shaft III, the crankshaft ismovably hinged to one end of the connecting rod II, and the other end of the connecting rod II is movably hinged to the slide block; the rotating shaft II is arranged at the lower part of the slide bar and located below the ultimate stroke of the slide block moving downward; the rotating shaft II is connected to a power transfer mechanism through a transmission device VI and can be driven by thetransmission device VI to rotate; and the rotary blade is mounted on the rotating shaft I and located right below the vertical blade. The shear type folium mori picking device is quick in picking speed, high in picking efficiency and convenient to use.

The invention belongs to the technical field of biology, and particularly relates to a double PCR (polymerase chain reaction) method for detecting Streptococcus suis type 2 and Haemophilus parasuis. The method comprises the following steps: respectively screening out Haemophilus parasuis conservative gene segment 16SrRNA and Streptococcus suis type 2 capsular polysaccharide gene cps2J from published documents as two gene target spots for PCR detection; putting 2 pairs of primers for amplifying the 2 gene segments into a PCR reaction system, and directly carrying out one-time detection on Streptococcus suis type 2 and Haemophilus parasuis from the sample by optimizing the annealing temperature, specificity and other parameters. The system of the method can accurately detect the pathogen and analyze the pathogen mixed infection conditions, thereby mastering the development trend and performing the effect of achieving two goals at one stroke.