131results about How to "Guaranteed hardness" patented technology

The invention discloses a master batch with a food fresh-keeping function. The master batch comprises the following components: 40-80 parts of PE resin; 5 to 30 parts of a nano composite antibacterial agent; 0.1 to 5 parts of a surfactant; 2-10 parts of a polyolefin elastomer; 5-25 parts of an organic gas adsorption material; 5-20 parts of a microporous modified atmosphere material; 1-25 parts of an antifogging agent; 0.1 to 10 parts of a lubricant; 0.1-5 parts of a dispersant; 0.1 to 1 part of an antioxidant; 0.1 to 3 parts of absolute ethyl alcohol; and 80 to 300 parts of ultrapure water. The master batch with the food fresh-keeping function has a broad-spectrum antibacterial effect, can reduce the rotting rate, the weight loss rate and the loss rate of fruits and vegetables in the production circulation link, adsorbs organic gas generated by respiration of the fruits and the vegetables, spontaneously adjusts the gas concentration content, and prolongs the fresh-keeping time and the shelf life of the fruits and the vegetables.

The invention relates to the field of C09J163 / 00, in particular to a fast-curing epoxy resin adhesive and a preparation method and application thereof. The fast-curing epoxy resin adhesive is composed of a component A and a component B, the component A at least comprises the following preparation raw materials: epoxy resin, a filler A, a diluent, a flexibilizer and a coupling agent A; the component B at least comprises the following preparation raw materials: a curing agent, a filler B, an accelerant and a coupling agent B; the curing agent is a combination of a polythiol curing agent and at least one of a phenolic aldehyde amine curing agent and a polyamide curing agent, by optimizing a formula system, the operable time (pot life), the curing speed and the hardness after curing of the product are effectively balanced, the product is rapidly cured within the proper operable time, the hardness after curing can be guaranteed, and the service life of the product is prolonged. And the actual application requirements of pipeline cold welding emergency repair are met.

The invention belongs to the technical field of gear machining equipment.The multi-hole gear machining punching equipment comprises a base, a telescopic rod is installed at the upper end of one side of the base, the outer end of the telescopic rod is sleeved with a sliding sleeve, the side end of the sliding sleeve is in threaded connection with a first positioning rod, a positioning table is arranged at the front end of the sliding sleeve, and a control box is installed at the top end of the telescopic rod; the bottom end of the front side of the control box is movably connected with a movable plate, a drill bit is installed at the side end of the movable plate, a cutting fluid spraying piece is arranged at the bottom end of the movable plate, a driving piece is installed at the top of the control box, and a circulating assembly is arranged in the base. Through the arrangement of the first placing assembly and the second placing assembly, personnel can complete single-hole or multi-hole punching operation of the gear by replacing the corresponding first placing assembly or the second placing assembly, meanwhile, cutting fluid in use can be purified, the working environment of use is guaranteed, the cutting fluid is recycled, and the use cost is saved.

The invention provides a method for improving the electric conductivity of C17460 beryllium copper, and belongs to the technical field of beryllium copper alloy treatment.The method comprises the steps that electrolytic copper, nickel and zirconium are laid in a vacuum melting furnace to be sequentially subjected to vacuum melting, refining and casting in a graphite mold to be solidified, and a copper-nickel-zirconium alloy is obtained; the method comprises the following steps: smelting electrolytic copper, a copper-nickel-zirconium alloy, a beryllium-copper master alloy and nickel in a non-vacuum smelting furnace, and then casting and cooling in sequence to obtain a C17460 beryllium-copper cast ingot; sequentially carrying out primary hot rolling, double-sided milling and rough rolling on the cast ingot; the strip is sequentially subjected to edge cutting, primary cleaning and brushing grinding, primary solution treatment, secondary cleaning and brushing grinding, primary finish rolling, secondary solution treatment, tertiary cleaning and brushing grinding, secondary finish rolling, primary cleaning, primary withdrawal and straightening, graded aging, secondary cleaning, secondary withdrawal and straightening and slitting. On the basis of keeping the original excellent mechanical properties of C17460 beryllium copper, the conductivity of the beryllium copper is improved, the production difficulty is low, and the cost is low.

The invention discloses folding cover plate glass, which comprises a folding cover plate glass main body, the upper surface and the lower surface of the folding cover plate glass main body are respectively a half-broken etching surface and an unetched glass surface, the half-broken etching surface is etched with a groove in a bending area of the folding cover plate glass main body, and the distance between the bottommost part of the groove and the unetched glass surface is 10-100 [mu] m. According to the invention, the half-breaking etching process is adopted in the bending area of the cover plate glass with the thickness of more than 0.1 mm to form the groove with a specific shape, so that the glass cover plate can have excellent bending performance while the hardness and the strength of the cover plate glass are ensured, and the problem that the bending area of the folding cover plate glass is fragile when being impacted by external force is solved.

The invention discloses automatic production equipment and a dosing system for medicated pellet feed. The automatic production equipment comprises production equipment and a dosing system, wherein the production equipment is used for uniformly mixing and granulating medicines and raw feed; and the dosing system is used for mixing medicated feed and the raw feed in proportion and conveying the mixture to a feeding side. The device solves the problem that a pig farm adopting pellet feed in the industry cannot feed medicine through pellet feed, and when no feed passes through a certain pipe, a sensor feeds back a signal so as to automatically stop and remind workers; besides, stirring blades rotate under the driving of a connecting rod while revolving along with a mounting frame, a floating frame drives the mounting frame to ascend and descend in the rotating process, finally, an upper cavity is divided into two stirring spaces by a stirring barrel, the inner side of the upper cavity is stirred by the stirring blades, and then the upper cavity is driven by a spiral blade to ascend and fall into the inner space from a circulating hole; a certain circulating effect is achieved, so that after the medicine is added and water is sprayed, the medicine can be uniformly mixed with the feed through stirring, and the uniformity of the medicine in the granulated feed particles is ensured; and finally, by arranging a discharging system, the two kinds of feed can be discharged according to the proportion, whether materials exist in a pipeline or not is sensed through two sensors in the discharging process, and precise dosing control is conducted.

The invention relates to the field of transformers, and particularly discloses a dry-type transformer production positioning tool which comprises a workbench, a positioning baffle, a drilling device, a fixed push rod and a push plate, the right side of the bottom of a cleaning plate is fixedly connected with a transmission mechanism, and the left side of the bottom of the cleaning plate is fixedly connected with a limiting assembly. The cleaning plate can move back and forth to complete automatic centralized cleaning operation of residual scrap iron on the table top; a stainless steel flexible pipe is connected and mounted on the winding disc; the drilling shaft is connected with an output shaft of the driving motor; and the cooling assembly is configured to synchronously start cooling liquid discharge to complete cooling of the drill hole when the drilling device performs drilling operation at a preset rotating speed. The dry-type transformer four-corner punching device is reasonable in structural design, four-corner punching operation can be conducted on boxes of different sizes, specifications and models, meanwhile, the drill rod is effectively cooled, the good protection safety effect is achieved, automatic cleaning of punching scraps is further achieved, and the operation efficiency of dry-type transformer production and machining is improved.

The invention relates to the technical field of food, and particularly discloses a preparation method of an oil gel-based shredded cake. The oil gel is adopted to replace existing common edible oil to prepare the shredded cakes, and the prepared shredded cakes are obvious in layering phenomenon and have excellent sensory quality and high stability.

The utility model discloses a main shaft structure, motorized spindle and machine tool, including shaft core and taper hole seat, the shaft core extends from the tail end to the nose end along the axial direction, the inside of shaft core is provided with shaft core inner bore, the taper hole seat and the shaft core are arranged in a split way, the taper hole seat is fixedly connected to the nose end of the shaft core, and the shaft core is provided with the shaft core inner bore. The taper hole seat is provided with a cutter handle installation hole communicated with the shaft core inner hole, and a hard layer is arranged on the surface layer of the cutter handle installation hole. The nose end of the shaft core is divided into the shaft core to be matched with the taper hole base, the separated taper hole base can achieve local surface modification, the abrasion resistance of the binding face of the pull claw is improved, and the service life of the taper hole base is prolonged while the precision of the main shaft broach is guaranteed.

The invention relates to the technical field of foamed silicone rubber and production and preparation processes, in particular to high-hardness foamed silicone rubber and a preparation method thereof.The high-hardness foamed silicone rubber is prepared from 1-20 parts of hydrogen-containing polysiloxane, 10-70 parts of hydroxyl-terminated polymethylvinylsiloxane, 1-30 parts of a mechanical reinforcing agent, 10-80 parts of a flame retardant and 0.05-0.3 part of a catalyst; the mechanical reinforcing agent is a mixture which simultaneously uses fumed silica, vinyl MQ silicon resin and surface-treated carbon nanotubes, so that the foamed silicone rubber has high hardness and does not increase the density, and meanwhile, by utilizing the shear thickening gel which is filled and adsorbed in the carbon nanotubes, when the foamed silicone rubber material is pressed, the foam silicone rubber material is not easy to deform. According to the present invention, the carbon nano-tube can rapidly harden, such that the originally soft carbon nano-tube can form the skeleton support on the foamed silicone rubber so as to improve the compressive strength and the permanent deformation property of the foamed silicone rubber, such that the foamed silicone rubber material with characteristics of good hardness, low density, excellent compressive strength and excellent resilience can be used for new energy battery support.

The utility model discloses a carbon fiber reinforced anti-cracking thermal insulation wall, and relates to the technical field of wall bodies, the carbon fiber reinforced anti-cracking thermal insulation wall comprises a wall body, the front end face of the wall body is provided with a carbon fiber reinforced plate, the four end faces of the wall body are fixedly provided with reinforcing plates, one side of each reinforcing plate is fixedly provided with a reinforcing block located in the wall body, and the other side of each reinforcing plate is fixedly provided with a reinforcing block located in the wall body. The wall body comprises a heat preservation wallboard, a buffer layer, a reinforcing material filling layer, a heat preservation material and a heat preservation layer, the reinforcing material filling layer is arranged between the buffer layer and the heat preservation material, and net-shaped reinforcing steel wires are arranged in the reinforcing material filling layer. The protection of the wall body is improved through the reinforcing material in the wall body, and the wall body is prevented from cracking.

This invention discloses a method for preparing a large round billet for continuous casting of forged cold-rolled roll sleeves, comprising: controlling the composition system, wherein the chemical composition of the raw material steel is: C: 0.65-0.75%, Si: 0.25-0.40%, Mn: 0.35-0.50%, P≤0.020%, S≤0.020%, Cr: 1.90-2.10%, Ni: 0.30-0.45%, Mo: 0.20-0.40%, V: 0.05-0.10%; and controlling the continuous casting process parameters, wherein the superheat is controlled within a certain range. The casting temperature is maintained between 15 and 35°C, the casting speed is kept stable at 0.24 ± 0.01 m / min, the crystallizer water flow is controlled at 3700 L / min, and the secondary cooling water flow in the crystallizer is controlled at 0.12 L / Kg. During continuous casting, a 200 A / 2.5 HZ electromagnetic stirring of the casting flow and a 500 A / 1.2 HZ strong end electromagnetic stirring are used. The heat treatment process parameters for the continuously cast round billets are controlled as follows: red-charging annealing of the continuously cast round billets, furnace charging temperature ≥ 400°C, heating rate ≤ 100°C / h, holding at 730°C for ≥ 15 h, furnace cooling to 400°C, and air cooling upon exiting the furnace. This invention ensures the hardness and wear resistance of the cold-rolled roll sleeves while improving toughness and machinability, avoiding surface cracking and internal cracking of the roll sleeves during the casting and forging processes, ultimately achieving high-efficiency production and long service life of the roll sleeves.

The present invention discloses a steel ball replaceable spline shaft nylon shaping tooth side positioning device, which mainly includes a nylon shaping tool die seat, etc. The nylon shaping tool is installed in the center of the nylon shaping tool die seat and fixed on the top with a nylon shaping tool pressing plate, a lower center is installed in the center hole of the nylon shaping tool die seat, an upper center is installed just above the lower center, a processing part is clamped between the upper center and the lower center, the nylon shaping tool is located outside the processing part, a linear slider is installed on one side of the nylon shaping tool pressing plate, a line feed rail is connected to the linear slider, the lower part of the circumferential positioning block is connected to the end of the line feed rail, and the circumferential positioning steel ball is fixed to the circumferential positioning block with a steel ball locking screw. The present invention improves the circumferential positioning stability during shaping of the nylon coating on the surface of the spline shaft, improves the wear resistance and maintainability of the device, can realize multiple uses of the positioning steel ball, can maintain the positioning accuracy after replacement, and reduces the adjustment time.

The present disclosure provides a bimetallic self-lubricating composite coating and a preparation method thereof, which relates to the technical field of metal coating modification. The bimetallic self-lubricating composite coating includes: a heat-conducting bearing layer and a lubricating and anti-friction layer; wherein: the heat-conducting bearing layer includes a copper alloy, and the copper alloy includes tin bronze and / or aluminum bronze; the lubricating and anti-friction layer includes a tin-based babbitt alloy matrix, a solid lubricant, and a plurality of hard phases. The bimetallic self-lubricating composite coating provided by the present disclosure can use the copper alloy as a heat-conducting bearing layer and use the tin-based babbitt alloy matrix, the solid lubricant, and the hard phase as a lubricating and anti-friction layer, thereby maintaining the mechanical strength, hardness, thermal conductivity, and heat resistance of the copper alloy, and lubricating and anti-friction can be performed based on the babbitt alloy, thereby solving the problem in the related art that the copper alloy has insufficient compliance, poor adaptability to the bending and misalignment of the shaft and the bearing, and relatively poor lubrication performance.

The utility model discloses a kind of automobile A column reinforcing member based on lightweight design, it is related to the technical field of automobile parts, including external steel body, the inside of external steel body is equipped with main body reinforcing component, the inside of main body reinforcing component is equipped with energy-absorbing member, the side of external steel body away from the surface of main body reinforcing component is equipped with sound insulation cotton.The utility model can make the internal structure of automobile A column more stable by main body reinforcing component, reduce the deformation due to collision, protect front compartment safety, by energy-absorbing member, local shock wave can be offset, ensure that front compartment living space is not deformed, while the material density of energy-absorbing member is smaller, the overall weight of A column can be reduced, so as to reduce the weight of entire vehicle body, reach the effect of reducing fuel consumption, while external steel body is fixed together by hinge hole bolt and angle steel bolt, compared with general welding mode, when maintaining, avoid cutting A column, cause stress concentration of A column, affect the safety of overall A column structure.

The utility model provides an aluminum alloy part oxidation device, belongs to the technical field of material surface treatment, and aims to solve the problem that the oxidation effect of an aluminum alloy part is influenced by non-uniform electrolyte caused by effective component sedimentation due to long-time standing of the electrolyte of the conventional aluminum alloy part oxidation device in the anodic oxidation process. The electrolyte box is of a rectangular box-shaped structure; the gear set shell is fixedly arranged at the upper end of the front end surface of the electrolyte box; the reciprocating driving motor is fixedly arranged on the left end face of the gear set shell; the spring limiting blocks are arranged on the upper end surfaces of the two cross beams of the pendant bracket; the reciprocating rotating assembly is arranged in the gear set shell; and the hanging frame fixing assembly is arranged at the position of the hanging piece support. The device has the comprehensive advantages that the electrolyte components are kept stable and uniform, and the oxidation process is faster and more efficient.

The present invention discloses a high-performance magnetic part and a production method thereof, comprising a magnetic ring, wherein the inner and outer layers of the magnetic ring are coated with an electrophoretic layer, the electrophoretic layer located on the outer layer is coated with a thermal conductive layer, V-shaped fins are installed on the thermal conductive layer, a filling layer is filled between each V-shaped fin, and the outside of the filling layer is coated with a sealing layer. The present invention can increase the corrosion resistance and firmness of the entire magnetic ring by coating the inner and outer layers of the magnetic ring with an electrophoretic layer, and can dissipate heat from the magnetic ring in a timely manner by coating the thermal conductive layer on the outer electrophoretic layer and the V-shaped fins arranged on the thermal conductive layer, and by arranging the filling layer between adjacent V-shaped fins, the hardness of the magnetic ring can be ensured, and the influence of the external temperature on the magnetic ring can be effectively isolated, and the performance of the magnetic ring can be effectively improved by the mutual cooperation between the structures.

A rubber-clad steel automatic tensioning device for an engine belongs to the technical field of chain tensioning devices and comprises an arc-shaped spring steel plate, nitrile rubber, a polytetrafluoroethylene coating and an anti-reversal ratchet mechanism, the nitrile rubber is coated outside the arc-shaped spring steel plate, and a protruding side of the arc-shaped spring steel plate forms a chain contact surface. A polytetrafluoroethylene coating is arranged on the contact face of the chain, one end of the arc-shaped spring steel plate is curled into an annular structure, a shaft sleeve is arranged in the annular structure, a fixing shaft is embedded in the shaft sleeve, and an anti-reversion ratchet mechanism is arranged between the fixing shaft and the inner wall of the shaft sleeve or between the outer wall of the shaft sleeve and the inner wall of the annular structure. And the fixed shaft is connected with the arc-shaped spring steel plate through a torsional spring. Through the design, all functions of a tensioning plate and a tensioner in the existing design are replaced. And on the other hand, through the arrangement, all functions of an existing tensioner and an existing tensioning plate are combined, meanwhile, the space structure is saved, the weight of the device is reduced, and the manufacturing cost of a tensioning system is reduced.

The invention discloses a zirconium-based fuel cladding surface corrosion-resistant interface integrated ZrxO / SiC multilayer composite coating and a preparation method thereof. The method comprises the following steps: 1, pre-oxidizing a zirconium-based fuel cladding to grow a ZrxO oxide film in situ; 2, performing Ar plasma sputtering activation on the pre-oxidized zirconium-based fuel cladding; and 3, alternately depositing to form the SiC composite coating with a multi-layer structure. According to the preparation method, pre-oxidation and magnetron sputtering deposition are combined, and the gradient composite structure coating from ZrxO in-situ growth of the matrix Zr to the surface SiC composite coating is constructed, so that the thermal mismatch and interface thermal resistance of matrix metal and the ceramic coating are reduced, the interface adaptability of the matrix and the SiC composite coating is enhanced, and by means of the high corrosion resistance, high heat conductivity and high hardness of the SiC composite coating, the thermal conductivity of the matrix metal and the surface SiC composite coating is improved. The improvement of surface corrosion resistance and wear resistance of the fuel cladding under normal and accident working conditions is synchronously realized, and the fault-tolerant capability of the zirconium-based cladding under the accident state is optimized.

The invention belongs to the technical field of high-temperature alloy connection, and particularly discloses novel cobalt-based brazing filler metal for high-temperature dissimilar metal connection and a preparation method and application of the novel cobalt-based brazing filler metal. The cobalt-based brazing filler metal is prepared from, by weight, 30%-70% of Co, 14%-27% of Ni, 11%-20% of Cr, 3%-6.5% of Fe, 1%-1.5% of Mn, 3%-6% of Si, 2%-4% of B, 0.3%-0.5% of Sc, 0.2%-0.4% of Y and the balance inevitable impurities. The melting point of the cobalt-based brazing filler metal ranges from 950 DEG C to 1100 DEG C, and the cobalt-based brazing filler metal is suitable for being used in the high-temperature environment of 600 DEG The method focuses on the refining process and performance evaluation of the Co * NiCrFe (Si, B) cobalt-based brazing filler metal, the content of the Co element is systematically adjusted, the brazing strength of the brazing filler metal is guaranteed, meanwhile, the wettability of the brazing filler metal is improved, composition segregation is reduced, and the process requirement for brazing connection of high-temperature dissimilar metal materials can be fully met.

The invention discloses a method for repairing the surface of a polished basin-type insulator based on uniform charge treatment, which comprises the following steps of: setting a stepped repairing material by adopting a method based on uniform charge treatment, repairing the polished insulator through a polished insulator surface repairing device, and keeping the hardness of the surface of the insulator; the method comprises the following steps: determining the shape of an insulator as a sample reference by adopting a three-dimensional scanner before polishing the insulator, polishing the insulator, applying a working voltage to a central conductor of the insulator, calculating a difference value of electric displacements of inner and outer normal lines of a recess after polishing the surface of the insulator, and further solving a surface charge quantity value Q2 of the insulator; the number of repaired step layers of the polishing area can be adjusted along with the process, a sprayed material is a mixture of epoxy resin, aluminum oxide and a curing agent, the dielectric constant of the mixture is 3-10, after preliminary repair, the difference value of measured and calculated surface charge quantity values of the insulator is compared, if the error of the two values is smaller than 10%, repair is finished, and if not, repair is finished. The method can be widely applied to the field of insulating device polishing surface repairing.

This utility model relates to a tissue separation device for spermatic vein ligation surgery, belonging to the field of male infertility surgery and medical devices. The separation device includes an intermediate pad with a central groove for accommodating a movable soft coil; hooks are provided on the opposite end face of the intermediate pad opposite the groove. The hooks bend downwards on both sides, effectively fixing the external spermatic fascia and cremaster muscle, fully exposing the surgical area. The silicone soft coil can be inserted between the blood vessels (testicular artery, pampiniform plexus) and the cremaster muscle, fully exposing the vessels to be ligated. The tissue separation device for spermatic vein ligation surgery provided by this utility model uses a medical-grade silicone soft coil, which has good biocompatibility, allows for flexible intraoperative operation, and its softness avoids damage to blood vessels.

This invention relates to a method for improving the bowl-shaped end face of drill collar steel after straightening, belonging to the technical field of drill collar steel production processes in the metallurgical industry. The technical solution is as follows: a seven-roll straightening method is used, with the reduction of the No. 1 and No. 3 upper and lower rolls being 4-5 mm, and the reduction of the No. 2 upper and lower rolls being 1-2 mm; the reverse bending amount is 15-16 mm; the straightening roll angles are: No. 1 upper and lower roll angle 29.5-30°, No. 2 upper roll angle 30-31°, No. 3 upper roll angle 29.5-30°, and lower roll angle 32-32.5°; the end of the straightened round steel is chamfered, with a chamfer angle of 30-45° and a chamfer length of 1-2 mm. The beneficial effects of this invention are: it can reduce the internal structural stress of the drill collar steel, ensure the hardness of the drill collar, and ensure that the bowl-shaped end face depth of the straightened drill collar steel is within 2 mm, avoiding cracking at the end face face during processing.

The invention discloses gear treatment equipment with a surface treatment function, and relates to the technical field of part machining, the treatment equipment comprises a feeding box and a treatment box, a feeding track is arranged on the feeding box, a feeding channel is arranged in the feeding box, the feeding track is communicated with the feeding channel, a treatment chamber is arranged in the feeding box, and the treatment chamber is communicated with the treatment box. A polishing frame is arranged in the processing chamber, an upper polishing ring and a lower polishing ring are arranged on the polishing frame and are in sliding connection with the polishing frame, polishing assemblies are arranged in the upper polishing ring and the lower polishing ring respectively, a receiving frame is arranged in the processing chamber, and an identification assembly is arranged in the feeding channel. The recognition assembly is electrically connected with the polishing assembly through a wire, a discharging channel is formed in the processing box, a discharging frame is arranged in the discharging channel, a bearing platform is arranged on the discharging frame, and the gear automatic recognition grinding and polishing device has the gear automatic recognition grinding and polishing function.

The utility model discloses a vacuum oil quenching furnace with stirring function belongs to vacuum oil quenching furnace technical field. Including the furnace body and the furnace cover, the furnace cover is hinged with the furnace body through the hinge, and the furnace cover is locked and fixed with the furnace body, and the inside of furnace body is equipped with the gas outlet, and the gas outlet is connected with the gas outlet pipe, and the inside of furnace body is slid with the connecting frame, and the connecting frame is suspended in the inside of furnace body, and the inside of connecting frame is rotatably connected with the shaft, and the outside of shaft is distributed with four sets of fixed frame, and the inside of fixed frame is all installed with three sets of clamp, and the clamp is used for clamping the plate -shaped work piece, and the outside of furnace body is installed with motor, and the motor is connected with the shaft transmission, and the top of furnace body is installed with a plurality of shower nozzles, and a plurality of shower nozzles are arranged vertically, and a plurality of shower nozzles are connected with the oil injection pipe, and the inside of fixed frame is suspended with the plate -shaped work piece through the clamp, and is suspended and fixed, and rotates through the motor drive shaft, and makes every work piece all can be close to the shower nozzle, thereby realizes the consistency to the work piece quenching.

The invention provides a composite forming auxiliary reagent for assisting living tissue shaping and a living tissue explant slice preparation method. The preparation method comprises the following steps: dissolving 4-15 parts by mass of methacrylated polyether F127 diacrylate F127DA, 2.5-5 parts by mass of a GelMA gelatin aqueous solution, 4-6 parts by mass of gelatin, 2.5-5 parts by mass of AlgMA sodium alginate hydrogel and 0.20-0.30 part by mass of an LAP photoinitiator in 100 parts by volume of a PBS buffer solution, and then completely immersing a tissue block into a composite forming auxiliary reagent, irradiating by using a UV light source to obtain a tissue hydrogel block, and slicing to obtain a living tissue explant slice; according to the composite forming auxiliary reagent, a tissue hydrogel block formed by wrapping a tissue block has proper strength and toughness, so that the whole structure can be ensured to have certain hardness and toughness, the tissue block is not easy to deform during cutting, and extra damage and even death of cells in the tissue caused by excessive strength under extrusion are also avoided; and gel fragmentation caused by cutting can be avoided, so that living tissue explant slices with uniform thickness are obtained.

The present invention discloses an ultra-high pressure, high temperature and low torque metal hard-sealed ball valve, including a main valve body and a limiting mechanism. Side valve bodies are fixed at both ends of the main valve body, the grease injection groove runs through the interior of the main valve body, the fixing frame is fixed on the top of the main valve body, the first trapezoidal block is slidably connected to the interior of the fixing frame, and the first trapezoidal block is connected to the connecting rod, a limiting plate is fixed on the sliding plate, and a rack is fixed on the surface of the limiting plate. The ultra-high pressure, high temperature and low torque metal hard-sealed ball valve is provided with a valve seat sealing ring and a self-lubricating layer. The valve seat sealing ring made of Deweilong material can ensure corrosion resistance, hardness and elasticity, so that the sealing surface between the ball and the valve seat sealing ring is tight and elastic, so that it can adapt to sealing under high pressure and low pressure conditions. The self-lubricating layer made of 304 stainless steel and PTFE flexible material can reduce the torque when the valve stem is rotated to drive the ball to rotate, which is convenient for use.

The invention discloses application of nicotinic acid in apple fruit preservation, and relates to the technical field of fruit preservation. According to the method, the niacin aqueous solution is adopted to soak or spray the apple fruits, so that the appearance of the fruits can be kept, and the fruit hardness, protopectin content and soluble pectin content during the storage period of the fruits can be maintained; meanwhile, the activity of superoxide dismutase and catalase of the fruits is improved, and the oxidation resistance of the fruits is enhanced. Nicotinic acid is used for fruit preservation, the preservation effect is good, and safety and reliability are achieved.

The invention discloses an alloy steel wire rod for a low-cost high-plasticity sorbite tool and a manufacturing method of the alloy steel wire rod. The alloy steel wire rod comprises the following chemical components in percentage by mass: 0.55-0.61% of C, 1.25-1.60% of Si, 0.60-0.80% of Mn, 0.60-0.80% of Cr, less than or equal to 0.35% of Ni, less than or equal to 0.35% of Cu, less than or equal to 0.025% of P, less than or equal to 0.020% of S and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of steel billet smelting, continuous casting, heating, controlled rolling and controlled cooling, wherein a soft reduction process is adopted for continuous casting, the initial rolling temperature is controlled to be 900-980 DEG C, the high-pressure water descaling pressure is larger than or equal to 19 MPa, the final rolling temperature is 780-840 DEG C, the spinning temperature is 780-840 DEG C, and cooling is conducted through an air cooling roller bed. The steel wire rod is free of precious metal and low in cost, the hardness of a finished product reaches 58-61 HRC, and the product requirement is met.

The invention discloses water-based two-component polyurethane refinishing paint resistant to impact of a high-pressure water gun and a preparation method of the water-based two-component polyurethane refinishing paint. The water-based two-component polyurethane refinishing paint is prepared from a component A and a component B, the component A is prepared by mixing the following raw materials in parts by weight: 60 to 70 parts of hydroxyl acrylic dispersion, 2 to 3 parts of dispersing agent, 0.1 to 0.3 part of defoaming agent, 0.5 to 1.0 part of wetting agent, 0.1 to 0.2 part of amine, 0.2 to 0.5 part of anti-settling agent, 2 to 25 parts of pigment filler, 0.2 to 0.4 part of flatting agent, 2 to 6 parts of cosolvent, 0.2 to 0.5 part of thickening agent, 0.2 to 0.5 part of ultraviolet absorber, 0.2 to 0.5 part of light stabilizer and 5 to 10 parts of water; the component B is prepared by mixing the following raw materials in parts by weight: 60-70 parts of an isocyanate curing agent and 30-40 parts of an ester solvent. The water-based two-component polyurethane refinishing paint disclosed by the invention can resist the impact of a high-pressure water gun, is good in weather resistance and quick to dry, and can be widely used for repairing a damaged paint film of engineering mechanical equipment.