334results about How to "Won't stay" patented technology

The invention discloses environmental-friendly and water-pressure-resistant tent leather and a preparation method thereof. The preparation method comprises the following steps: adding preparations such as a water-based thickening agent, a defoaming agent, a leveling agent and a curing agent into water-based polyurethane resin, and carrying out mixing and vacuum defoaming to form a water-based polyurethane resin slurry surface layer, middle layer and binding bottom layer; and by a processing method with dry-process film transferring, firstly coating release paper with the surface layer, then coating the release paper with the middle layer and the binding bottom layer after drying and cooling, drying till the release paper is in a half-dry state, then attaching base cloth, drying, curing, cooling, stripping the release paper, bundling, and carrying out surface after-treatment, thus obtaining the environmental-friendly and water-pressure-resistant tent leather. The environmental-friendly and water-pressure-resistant tent leather disclosed by the invention has the advantages that the problems of environmental pollution and residue of organic solvents for preparing traditional tent synthetic leather are solved, and the water-pressure resistance, the yellowing resistance, the waterproof effect, the breathable function and the like of the tent leather are improved.

The invention provides a processing technology of glass protection. According to the processing technology, a protection film is added on the surface of glass before the processing operation of glass cutting or edging, so as to avoid problems such as scraping, corner-chipping, adherence, stain-bonding and the like during glass cutting or edging, save technological processes of coarse grinding and polishing, greatly reduce production cost and improve the yield.

The invention discloses a system and method for recycling and supplying mortar to multi-wire cutting machines. The system comprises a finished product mortar storage tank, a main supply pipeline, an auxiliary reflowing pipeline, a branch supply pipeline, a waste liquid back-pumping main pipeline, a waste liquid back-pumping branch pipeline, a waste liquid recycling tank, a mortar separation and purification device, a silicon carbide dense mortar storage tank, a recycled liquid storage tank, a silicon carbide dense mortar pumping pipeline, a recycled liquid pumping pipeline, a cutting liquid supplementing pipeline and a silicon carbide micropowder supplementing pipeline. The method comprises the following steps of: firstly, supplying finished product mortar: reflowing the finished product cutting mortar before the mortar is supplied to the multi-wire cutting machines, supplying the finished product cutting mortar, completing the supplying of the mortar, and then continuously reflowing the finished product cutting mortar; secondly, recycling waste mortar; and thirdly, starting a stirrer of a mortar recycling device, separating and purifying the waste mortar, compounding and recycling the finished product cutting mortar. The system is reasonably designed, simply and conveniently operated, can simultaneously supply the mortar to a plurality of cutting machines without retaining the mortar in each pipeline.

The invention discloses a multifunctional soft water valve, which comprises a valve body, a cover, an ejector, a fixed valve plate and a movable valve plate, wherein the soft water valve is provided with a water inlet, a water outlet, a drain outlet, a first filter core interface, a second filter core interface and a salt absorbing port; an ejector outlet and an ejector inlet are formed in the soft water valve; the fixed valve plate is provided with a first through hole, a second through hole, a third through hole, a fourth through hole, a fifth through hole and a sixth through hole; the first through hole is communicated with the first filter core interface; the second through hole is communicated with the fifth through hole, and is communicated with the second filter core interface; the third through hole is communicated with the ejector inlet; the fourth through hole is communicated with the ejector outlet; the sixth through hole is communicated with the water outlet; the first through hole is adjacent to the second through hole; the second through hole is adjacent to the third through hole; the third through hole is adjacent to the fourth through hole; and the movable valve plate is provided with a water inlet channel, a conduction blind hole and a pollution discharge channel. The multifunctional soft water valve has the beneficial effects of practicability, large flow, saving in salt, environment friendliness and prolonging of the service life of the valve body.

The invention relates to an impregnation mold for continuous / fiber reinforced thermoplasticity, and a use method thereof, and belongs to the technical field of preparation of a continuous / fiber reinforced thermoplastic composite material. The impregnation mold provided by the present invention comprises a body. The technical points of the body are that: a fiber impregnation flow channel is arranged in the body; an upper portion of the fiber impregnation flow channel is connected with a guidewire block; the guidewire block is provided with silk separating holes; the silk separating holes are communicated with the fiber impregnation flow channel; a side portion of the body is provided with a impregnation melt feeding inlet; the impregnation melt feeding inlet is communicated with the fiber impregnation flow channel. The use method comprises that: continuous fiber enters into the impregnation mold through the silk separating holes on the guidewire block, and contacts molten thermoplasticresin; the fiber passes through a ring-shaped and ripple-like impregnation flow channel between a circular ripple revolving body core shaft and an inner wall of the body chamber, wherein the inner wall has the same shape as the external surface of the circular ripple revolving body core shaft; then the fiber bundle are forced to be expanded and dispersed to realize the impregnation of the fiber by the resin. According to the present invention, impregnation efficiency is high, and dispersion of the fiber is realized well during the impregnation process.

The present invention relates to a heat-resistant adhesive sheet (tape). More particularly, the invention relates to a heat-resistant adhesive sheet of high reliability and workability, in which crosslink reaction can be induced through irradiation of energy rays on an adhesive layer to achieve heat resistance at high temperature and also high dimension stability in parts, to achieve release without leaving any adhesive residues on an attached surface in releasing the layer and also to achieve no oxidation on the attached surface, e.g., a metallic surface at a high temperature. To this end, the heat-resistant adhesive sheet (tape) according to the invention is characterized by comprising a heat-resistant substrate, and an adhesive layer formed on at least one side of the heat-resistant substrate and made with a coating of liquid comprising energy ray curable olygomer resin, thermosetting adhesive resin, energy ray initiator and thermosetting agent, the adhesive layer being cured and heat resistant by irradiating energy rays to induce crosslink reaction.

The invention discloses a processing method of dry bamboo shoot slices. The processing method comprises the following steps: cleaning, slicing, color protecting, drying, packaging and sterilizing, and is characterized in that: fresh bamboo shoots are selected and then shells of the bamboo shoots are peeled off, the peeled-off bamboo shoots are cleaned and then cut into bamboo shoot slices, the bamboo shoot slices are immediately put into a color protection solution and then subjected to three-time heated air circulation drying and airing, and the dry bamboo shoot slices are obtained, vacuumized and then sterilized. The processing method has features of simple process, unchanged color of the dried bamboo shoot slices, and long preservation time and high quality of the bamboo shoot slices.

The invention provides water-based dry method foaming raincoat leather and a preparation method thereof. A water-based thickening agent, a defoaming agent, a flatting agent and other preparations are added into waterborne polyurethane resin, slurry on the surface layer, the middle layer, and the foaming layer and the bottom layer of waterborne polyurethane resin slurry is prepared through mixing and vacuum defoaming; through a dry method film moving processing method, release paper is firstly coated with the surface layer, the surface layer is coated with the middle layer after being dried and cooled, the middle layer is coated with the foaming layer after being dried and cooled, and the foaming layer is coated with the bottom layer after being dried and cooled; after low-temperature drying, base cloth is attached at high temperature, drying, curing and cooling are carried out, the release paper is stripped, split rolling and surface aftertreatment are carried out, and the water-based dry method foaming raincoat is obtained. The obtained water-based dry method foaming raincoat has good washing and water pressure resistance, and the water pressure resistance is still 10,000 MPa or above after washing; the water-based dry method foaming raincoat leather is soft in hand feeling, resistant to wrinkles, high in real leather sense, good in breathability and high in washing and water pressure resistance and completely meets the needs of the market for raincoat leather.

A flush toilet which including a bowl portion having a waste-receiving surface, a rim and a recess; a water spouting portion for spouting the flush water forwardly; and a drainage conduit. The recess of the bowl portion has a bottom below a pooled water level, and a wall surface connecting between the bottom and a lower edge of the waste-receiving surface, wherein the bottom of the recess has a front bottom surface and a rear bottom surface. The bowl portion is configured to allow flush water to form a major stream which is directed to flow from an front end of the bowl portion toward the inlet of the drainage conduit, and the rear bottom surface of the bottom is configured to allow a part of the major stream to collide therewith, and then guide the collided major stream to a front region inside the drainage conduit.

The invention discloses an on-line de-icing device for a power transmission line. The on-line de-icing device comprises a walking mechanism and a rack which is connected to the lower portion of the walking mechanism through mechanical arms. The walking mechanism comprises a rear walking wheel and a front walking wheel, wherein the rear walking wheel is clamped on the de-iced portion of the power transmission line, and the front walking wheel is clamped on the icing portion of the power transmission line, a de-icing mechanism is arranged on the rack and located between the rear walking wheel and the front walking wheel, a wireless controller is arranged on the left side inside the rack, and the walking mechanism is connected with the wireless controller through electric signals; the de-icing mechanism comprises an ice cover crashing module and a water jet cutter dividing module in sequence from left to right. The water pressure of the water jet cutter dividing module can be adjusted according to the detected thickness of an ice cover layer, so that the on-line de-icing device efficiently carries out de-icing without being affected by the thickness of the ice cover layer when the surface ice cover is divided, and also will not damage the line.

The invention discloses a paper starch adhesive and a preparation method thereof. The paper starch adhesive comprises the following components in part by weight: 100 parts of starch, 300 to 600 parts of water, 0.1 to 0.3 part of potassium hydrogen peroxymonosulfate, 5 to 10 parts of caustic soda, 1 to 5 parts of epoxy chloropropane, 0.5 to 1.5 parts of boric acid, 1 to 3 parts of sodium sulfite, 4 to 8 parts of light calcium carbonate and 2.5 to 5 parts of bridging agent. The preparation method comprises the following steps of: adding water into a reaction kettle, heating the water to 38 DEG C, adding the starch into the water, stirring the solution, adding potassium hydrogen peroxymonosulfate solution into the reaction kettle, and reacting the mixed solution for 20 minutes with stirring; diluting the caustic soda, then slowly adding the caustic soda into the reaction kettle twice, stirring the solution for about 20 minutes to form milk white or light yellow transparent colloid, then adding the boric acid, the bridging agent and the light calcium carbonate into the colloid, and stirring the mixture uniformly; and adding the epoxy chloropropane, sodium aliphatate and the sodium sulfite into the reaction kettle with stirring, and stirring the mixture uniformly to obtain the paper starch adhesive. The adhesive has the characteristics of stable viscosity, good adhesiveness, low comprehensive cost, good permeability and the like.

The invention discloses a preparation method of a lithium-pre-embedded hard carbon material. The preparation method includes S1, mixing a hard carbon active material with a binding agent and an electric-conducting agent, adding solvent to stir evenly to obtain thick liquid, spreading the thick liquid onto a copper foil, and drying the copper foil to obtain an initial hard carbon material; S2, in an inertia gas protection atmosphere, adding electrolyte onto the initial hard carbon material until the electrolyte immerses the surface of the initial hard carbon material, completely covering the initial hard carbon material with a metal lithium sheet I to allow lithium-pre-embedded reaction, and removing the metal lithium sheet I after a certain reaction time t to obtain the lithium-pre-embedded hard carbon material, wherein the t is longer than 0 minute but shorter than or equal to 120 minutes. The preparation method has the advantages of simplicity and convenience in operation, short duration, low cost, capability of improving first coulombic efficiency of high-negative-electrode materials and the like.

An exhaust gas recirculation equipment (10), an exhaust gas path (35) of the exhaust gas recirculation cooler (20) assembled between the exhaust gas recirculation tubing (11) is provided in the lower of exhaust gas exit (33) side by the exhaust gas entrance (32) side. In addition, the exhaust gas path (35) can arrange the exhaust gas entrance (32) side in the lower tilting at least 5 degrees relative to the horizontal plane. So the condensation water can reliable flow to one side of the exhaust gas entrance. Thereby the vitriol component in the condensation water can be decomposed and vaporized by the gas exhausting via high temperature, capable of preventing corrosion of each part in the exhaust gas recirculation equipment. This exhaust gas recirculation equipment can not erode each part in the exhaust gas recirculation equipment by the condensation water of the exhaust gas generated by the exhaust gas recirculation cooler.

The invention discloses a lithium-rich manganese-based anode material, a preparation method thereof and a lithium ion battery containing the anode material. A chemical formula of the lithium-enrichment manganese-based anode material is Li1+xMnyMzAwOr, wherein the M is at least one of Ni, Co, Al, Mg, Ti, Fe, Cu, Cr, Mo, Zr, Ru and Sn; the A is at least one of S, P, B and F; the x is larger than 0 and smaller than or equal to 1, the y is larger than 0 and smaller than or equal to 1, the z is larger than or equal to 0 and smaller than 1, the w is larger than or equal to 0 and smaller than or equal to 0.2, and the r is larger than or equal to 1.8 and smaller than or equal to 3. The lithium-enrichment manganese-based anode material is prepared by methods of oxalate coprecipitation, spray drying and high-temperature roasting. The lithium-enrichment manganese-based anode material disclosed by the invention overcomes agglomeration of a material prepared through an oxalate coprecipitation method; a prepared material is controllable in particle size, meets requirements of engineering indexes and can achieve the purpose that transition metal ions are evenly mixed at an atom level; the particle size of the prepared lithium-enrichment manganese-based anode material is 3 to 25mu m, and the lithium-rich manganese-based anode material has good rate capability and circulation performance at the same time; furthermore, the lithium-enrichment manganese-based anode material has the advantages of simple preparation technology, low cost and wide application prospect.

The invention discloses a high-temperature-resistant vacuum bag sealing adhesive tape, which is formed by stirring, mixing and extruding butyl rubber, chloroprene rubber, cardanol modified phenol-formaldehyde resin, nano calcium carbonate, glass fiber, superfine talcum powder, zinc oxide, stearic acid, tackifying resin, titanium dioxide and dioctyl phthalate. The high-temperature-resistant vacuum bag sealing adhesive tape has the beneficial effects that no air leakage is caused during vacuuming in a manufacturing process of a fan blade and an airplane, the maximum service temperature can reach 425 DEG C, and meanwhile, no residual adhesive is remained on a mold when the high-temperature-resistant vacuum bag sealing adhesive tape is separated from the manufacturing mold.

The invention discloses an air purification device which comprises a centrifugal fan, an inner guide barrel and a device shell, wherein an air inlet pipe is arranged on one side of the device shell; a drainage opening is formed in the bottom of the device shell; the inner guide barrel is arranged in the device shell; an air outlet pipe is arranged on the other side of the inner guide barrel, opposite to the air inlet pipe; the air outlet pipe penetrates through the device shell; the centrifugal fan is arranged at the upper part of the inner guide barrel; a first guide pipe surrounds on the outer wall of the inner guide barrel; an inlet through which the first guide pipe penetrate in, and an outlet through which the first guide pipe penetrates out are formed in the device shell. The guide pipe is used for fixing the air flow direction, so that water vapor and waster components in air (such as wet air or air containing fiber) can be effectively separated; the air purification device is automatically cleaned, simple to maintain, energy-saving, environmentally friendly and wide in application scope.

The invention concerns an antiseptic compress comprising a contact surface with the wound or burn, consisting of an elastomeric matrix highly plasticized with a non-polar oil or grease, said elastomeric matrix containing a dispersed hydrocolloid. The invention is characterised in that said elastomeric matrix further comprises likewise dispersed at least an antiseptic agent and at least a surfactant whereof the hydrophilic / lipophilic balance (HLB) is higher than 10. The invention is applicable in particular to compresses and dressings.

The invention provides a solar potable water preparation system and a method for preparing potable water by using the solar potable water preparation system, which aims to overcome the defects that when hot water is prepared by a solar water heater in the prior art, water scales and deposits are easily formed, nitrite is produced, and the potable water standard cannot be achieved. The solar potable water preparation system comprises a heat gathering system, a water storage system, a water system and an electric control system, wherein the water outlet temperature of the heat gathering system, the water level of the water storage system, and the water temperature and water level of the water system are controlled by the electric control system. By using the solar potable water preparation system and the method for preparing the potable water, the production of the nitrite can be prevented or effectively reduced, thereby obtaining the potable water which achieves the potable water standard.

The invention discloses a laser positioning compass and belongs to stationeries. The laser positioning compass is structurally characterized in that a laser switch is arranged at the top of a non-slip knob; the lower end of the non-slip knob is connected with the upper end of a transparent window; the lower end of the transparent window is connected with the upper end of a rotary shaft; the rotary shaft is connected to the top of a base; a plurality of foot stands are fixedly connected to the lower part of the base; non-slip foot pads are connected to the bottoms of the foot stands; the non-slip knob, the transparent window, the rotary shaft and the base have the same shaft line; a laser head is positioned on the shaft line and connected onto the lower surface of the base; one end of a beam ruler is connected onto the transparent window; the other end of the beam ruler is vertically connected with a connecting plate; the lower end of the connecting plate is connected with a pen clip; and the pen clip is connected with a writing pen. The laser positioning compass is simple in structure and very convenient to use; the center of a circle can be accurately positioned by laser; the circle can be accurately drawn; a hole cannot be left in a paper sheet; the obtained drawing is beautiful; the circumferential radius can be drawn by the configured ruler; and the circle drawing efficiency is improved.

The invention belongs to the field of lens cleaning and discloses a component, a system and a method for cleaning lens. The component for cleaning lens provided by the invention comprises an ion module, a first clamping module, a spraying module and a second clamping module. The spraying module performs spray wash on the surface of the lens by atomized alcohol, and a cleaning material is clamped by the first clamping module and the second clamping module to remove the impurity on the surface of the lens after spray wash. The surface of the lens is dried by the ion module and the frictional static on the surface of the lens is eliminated. The cleaning efficiency is high and the lens can be cleaned more cleanly without scratch on the surface of the lens. In addition, the cleaning method is simple and the operation is easy.

The invention discloses a pneumatic torque-adjustable cap screwing device capable of flexibly clamping, which comprises a cap screwing thread bushing, an elastic clamp ring, a rotary cover base, a gland core, a central spindle seal ring, a tightening nut, an air cavity, air inlet passages, a hollow rotating shaft, a protecting bush, an axial seal ring, a lower bearing pedestal, a bearing, an air inlet pipe, an upper bearing pedestal, an adapter sleeve, a connecting seat and a pneumatic motor, wherein the cap screwing thread bushing, the elastic clamp ring, the rotary cover base, the gland core, the central spindle seal ring, the tightening nut, the air cavity and the air inlet passages form a bottle cap pneumatic chuck; the hollow rotating shaft, the protecting bush, the axial seal ring, the lower bearing pedestal, the bearing, the air inlet pipe, the upper bearing pedestal, the adapter sleeve, the connecting seat and the pneumatic motor form a pneumatic cap screwing drive part; the bottle cap pneumatic chuck is utilized to flexibly clamp a bottle cap, the clamping force can be adjusted, the bottle cap cannot be damaged, and clamp marks cannot be preserved on the bottle cap. The pneumatic cap screwing drive part can stably screw the bottle cap in a fixed torque manner according to the predetermined requirements, and the torque of cap screwing can be adjusted and controlled. A pressure relief air passage communicated with the outside is arranged on the lower end surface of the gland core, so that a bottle cap can be conveyed to a certain position. The device has the advantages that the structure is simple, the pneumatic flexible clamp is realized, the pneumatic cap screwing is performed in a torque-adjustable manner, the cap screwing operation is stable and reliable, the cap screwing speed is high and steady, the running cost is low, and the maintenance is facilitated.

The invention discloses a processing method of dried bitter gourd slices. The processing method comprises the following steps: cleaning, slicing, color protecting, drying, packaging and sterilizing. The processing method is characterized by specifically comprises the following steps: picking fresh green bitter gourds, cleaning, slicing into bitter gourd slices, completely soaking the bitter gourd slices in a color-protecting solution, immediately fishing out, performing heated air circulation three times, drying, spreading for cooling, vacuum-packaging and then sterilizing to obtain the dried bitter gourd slices. The processing method of the dried bitter gourd slices, disclosed by the invention, has the characteristics that a process is simple, the production period is short, the appearance of the bitter gourds can be kept, the nutrients of the bitter gourds can not be damaged, the bitter gourds are not oxidized so as to enable the color to be changed, certain charantin and similar insulin are remained, and the like.

The invention discloses a preparation method and an application of a biological scaffold material and SVF assistant adipose tissue. Under an aseptic condition, the biological scaffold material, a stromal vascular fraction (SVF) prepared by digesting purified adipose granules with a medical-graded collagenase, and the purified adipose particles are evenly mixed according to a certain proportion to prepare an adipose graft for filling. The SVF is a mixture of adipose mesenchymal stem cells and various cells, is transplanted after being mixed with autogenous adipose particles, and can be continued to be developed into a mature adipose tissue in vivo; the biological scaffold material can provide a support for transplanted adipose, allows the transplanted tissue to be prone to revascularization, and improves the survival rate of the transplanted tissue; the transplanted tissue is suitable for being injected with a 16 G or 18 G needle, facilitates clinical application, and can be used for repairing of concave deformity (such as tempora and cheek concave), beautifying packing of faces and chests, soft tissue function reconstruction and the like; and especially in the beautifying packing, the prepared transplanted adipose tissue can promote shape recovery and prevent liquefactive necrosis.

The invention discloses a planting method for tea trees. The method comprises the following steps: applying fertilizer on cultivated land, planting tea tree seedlings, performing pest management, performing fertilization management, performing tea-picking management, and shaping and trimming. Through applying a base fertilizer mixed with Chinese herbal medicinal ingredients on a seedbed, the seedbed can effectively absorb nutritional ingredients of the base fertilizer, so as to speed up absorption of phosphorus by the tea tree seedlings, speed up growing speed, improve yield of tea, improve disease resistance of tea tree seedlings, and reduce case fatality rate of the tea tree seedlings. The base fertilizer contains effective component of enzymes bacteria, and can promote absorption of nitrogen phosphorus and potassium by the tea trees, and effectively prevents problems of soil hardening and salinization. Through using a pesticide containing Chinese herbal medicinal ingredients with insecticide effect, insect diseases are effectively prevented, and the ingredients has no harm on human bodies, and hazardous substances would not be retained, so as to effectively improve quality of tea.

The invention discloses a preparation method for a powder sintering material. The preparation method comprises the following steps that a matrix and a surface layer raw material are weighed accordingto the formulation requirement; the matrix and the surface layer raw material are added into a blender mixer to be fully mixed, anda matrix mixture and a surface layer mixture are obtained; a matrix green body is pressed and made, and then a surface layer green body is pressed and made; and the matrix green body and the surface layer green body are sequentially placed in a forming mould for beingpressing into a pressing blank, andthe pressing blank is placed into a sintering furnace for sintering to obtain the powder sintering material. According to the preparation method for the powder sintering material, the forming process is divided into pre-pressing forming and re-pressing forming, the matrix green body and the surface layer green body are pressed in the pre-forming mould by using low pre-pressure, during pre-pressing pressing, powder flows to make the surface of the green bodies become smooth, and the green bodies with the even thickness are obtained in a pressedmode; and then high pressure is used to pressing the green bodies into the pressing blank, and due to the fact that re-pressing pressure is greater than the pre-pressing pressure, during re-pressing, laminated materials can be fully compacted, and defects cannot be left inside the laminated material green bodies.

The invention provides a trigger and a generator voltage regulator. The trigger comprises a comparison unit, which is connected with a power supply end, ground and a switch unit and is used for outputting a first voltage to the switch unit when the voltage at an in-phase input end is larger than that of an inverse-phase input end, and outputting a second voltage to the switch unit when the voltage at the in-phase input end is smaller than that of the inverse-phase input end; the switch unit, which is connected with the ground or the positive pole of a power supply and a trigger control end, and is used for enabling the control end to be conducted with the ground under the control of the comparison unit, or enabling the control end to the conducted with the positive pole of the power supply; and a feedback unit, which is connected with the control end and the inverse-phase input end of the comparison unit, and is used for positively feeding back the signal of the control end to the inverse-phase input end of the comparison unit. When the trigger is applied to the voltage regulator, integration of multiple functions of excitation fixed-frequency triggering, immediate overvoltage cutting off and over-current protection is realized; and a sampling circuit does not need a capacitor, and synchronous detection and overvoltage excitation cut off are realized, and overtime overvoltage excitation does not occur, so that the effects of stable voltage, accurate adjustment and being safe and reliable are achieved, and the service life of the regulator and the service life of a generator are prolonged.

The invention discloses a coated yarn for harness protection, which is used for being woven into a woven yarn layer wrapping a wire, and the woven yarn layer is of an interleaved structure, is not affected by outside temperature, and has a wide application range; the structure is compact, the occupied area is small, and the service life is long; the material can resist wear and high and low temperatures. Because the woven yarn layer is provided with tiny gaps, the woven yarn layer has good heat dispersion, and is soft and waterproof, particulate matter cannot be retained in special operation, and thereby the service life of the wire is long; during installation, an adhesive tape is needed for binding, other accessories are not needed, and therefore installation is convenient; nylon filaments or terylene filaments are chosen as core filaments, so that the tensile strength of the coated yarn is enhanced greatly, while coating made of high-performance material such as polyvinyl chloride, polyvinylidene fluoride or polyester rubber endows the coated yarn with the advantages of high temperature resistance, corrosion resistance and ultraviolet resistance.

The invention belongs to the technical field of steel and iron metallurgy, in particular to a pre-deoxygenation method and device for spraying blowing of carbon powder in a tapping hole of a converter. A plurality of carbon powder spraying pipes are installed in a tubular refractory material of the tapping hole of the converter, in the tapping process of the converter, the carbon powder is blow into tapping steel stream in a spraying manner, the carbon powder and dissolved oxygen [O] in molten steel have a reaction, and CO is generated. By means of the carbon powder spraying pipes in the tapping hole, the carbon powder is blown into the tapping steel stream in the spraying manner for deoxygenation, a deoxygenation product is CO, the gas state CO can escape from the tapping steel stream andis discharged into the atmosphere, no inclusion is left in the molten steel, and no harm is caused to the steel material quality. The carbon powder has large deoxygenation space and has very high deoxygenation capacity, and more than 40% of dissolved oxygen in the molten steel can be removed. Compared with deoxygenation performed through aluminum, about 90% of the deoxygenation cost can be savedby adopting the carbon powder; and compared with deoxygenation performed through silicon, about 80% of the deoxygenation cost can be saved by adopting the carbon powder.

The invention relates to an impeller for a pump unit, in particular for a waste water pump unit, having two cover plates (2, A) which are spaced apart from one another in the axial direction (X) and are connected to one another by means of at least one connecting element (8), and having at least one blade (12, 14) which is arranged between the two cover plates (2, 4) and extends from an inner diameter of the impeller to an outer diameter of the impeller, wherein the blade (12, 14) has a continuous slot (16) which extends from that edge (22, 24) of the blade (12, 14) which is situated at the inner diameter to that edge (26, 28) of the blade (12, 14) which is situated at the outer diameter, and to a pump unit having an impeller of said type.