82results about How to "Avoid too thick" patented technology

The invention discloses an embedded stirring and rubbing slit welding method for dissimilar metals, which is especially suitable for large-area lap connection of aluminum or magnesium or harder metal materials. The embedded stirring and rubbing slit welding method comprises the steps of: firstly, processing one or more dovetail grooves on a second harder base material; secondly, assembling according to a lap connection form, and placing an aluminum plate on the upper sides of the dovetail grooves of the second harder base material; using a needle-free stirring head and installing in an inclining manner; starting the stirring head to rotate and enabling the stirring head to be in contact with the upper surface of the aluminum plate, wherein the pressing depth of the stirring head is limited to about between 0.1mm and 2mm and a welding interface needs not to be penetrated; after rubbing and preheating for several seconds at the starting end, moving the rotating stirring head or operating platform so that the aluminum plate is helically extruded in a groove of a lower plate and the welding or cladding is completed. Compared with the resistance slit welding, the method disclosed by the invention has remarkable energy saving advantage. Compared with the traditional stirring rubbing welding, the method disclosed by the invention has the advantages of no keyhole and no abrasion to needles by the harder base material. The method can be used for welding, and can also be used for preparing a bimetal composite plate.

The invention discloses titaniferous stainless steel electroslag remelting casting powder which is prepared from the raw materials in parts by weight as follows: 46.0-50.0 parts of fluorite, 20.0-24.0 parts of alumina powder, 18.5-22.5 parts of lime, 3.5-5.5 parts of fused magnesite, 2.0-4.0 parts of titanium dioxide as well as other components: 0.0-0.6 part of SiO2, 18.0-22.0 parts of CaO, 20.0-24.0 parts of Al2O3, 4.2-5.8 parts of MgO, 2.0-4.0 parts of TiO2, 45.0-51.0 parts of CaF2, less than 0.03 part of S and less than 0.03 part of C. Slag is formed by the casting powder according to strict quality control standard so as to ensure that the impurity content is low, the purity is high and the slag is dry and free from moisture. In the electroslag remelting process, desulfuration and deoxygenation effects are enhanced, the resistivity is improved, and the casting powder is free from cutoff in arcing, good in lubrication and relatively easy to popularize and apply.

The present invention relates to the field of polymer materials, and further relates to a carbon nanotube / polylactic acid conductive composite material and a preparation method thereof. The carbon nanotube / polylactic acid conductive composite material contains the following groups in blending: 100 parts by weight of polylactic acid and 0.5-10 parts by weight of a modified carbon nanotube conductive powder; the material can also include 0.2-4.0 parts by weight of a non-ion surface active agent, can also further comprise 0.03-0.05 part by weight of an antioxidant. The method of the invention is simple in operation process and suitable for continuous mass production. The obtained carbon nanotube / polylactic acid conductive composite material has good carbon nanotube dispersion, improved aggregation phenomena, good anti-antistatic and conductive properties, and biodegradability and biological compatibility, and can be applied to the fields of electronics, communication and bio-engineering.

The invention discloses a hot galvanizing process. The hot galvanizing process is characterized in that thiourea with concentration being 0.12% is added during pickling, wherein a picking temperature is 50 DEG C, so that a workpiece can be prevented from being over-etched, and hydrogen absorption capacity of ferro matrix can be reduced; an ultrasonic cleaning agent with concentration being 7.5% is added during ultrasonic cleaning, so that greasy dirt and corrosion on the surface of a workpiece can be quickly removed; the ultrasonic cleaning agent is trichloro ethylene which does not contain phosphate, is harmless to aquatic life, is harmless to a human body and is free of stimulation on skin; the cooling comprises the following two steps: a first step, slow cooling, wherein a cooling speed is 10 DEG C/S, and the workpiece is cooled to a temperature of 650 DEG C; and a second step, quick cooling, wherein the workpiece is cooled by a cooling fan, and is cooled to a temperature of 445 DEG C, so that the structure of the workpiece can be prevented from being damaged; pure aluminum with concentration being 0.02% is added into a zinc pot before galvanizing, so that mobility, at a relatively low temperature, of a hot galvanizing solution is improved, a coating is prevented from being thickened, and the appearance of the coating is improved; a bearing produced by adopting the method has the advantages of corrosion resistance, great bonding strength of a galvanized coating and long usage time, is great in market potential and is wide in prospect.

The invention discloses a glaze spraying device for production of ceramic products and belongs to the technical field of ceramic production equipment. The glaze spraying device is technically characterized by comprising a liquid storage tank; a flow guide cover is arranged on the liquid storage tank; a mounting barrel is arranged in the flow guide cover; a plurality of first nozzles are vertically distributed on the side wall of the mounting barrel; a fixing seat is arranged on the upper side of the mounting barrel; a plurality of second nozzles are distributed on the fixing seat; the first nozzles and the second nozzles cooperate to spray glaze on inner walls of blanks; the first nozzles and the second nozzles are connected with a glaze spraying pump arranged on the outer side of the liquid storage tank through pipelines; the liquid inlet end of the glaze spraying pump extends into the liquid storage tank; a plurality of scraper plate adjusting cylinders are vertically arranged on the mounting barrel on sides of the first nozzles at intervals and are connected with an external compressor; and the free ends of telescopic rods of the scraper plate adjusting cylinders are connected through a rubber plate. The glaze spraying device is convenient to use and good in effect and is used for glazing of the blanks.

The invention relates to the technical field of printed circuit boards, in particular to a method of preparing a PCB with improvement on back hole drilling burrs and a small crimping hole. The production design requirements are met by one-time electroplating to the thickness of the hole copper during the whole plate electroplating, a pattern electroplating process in a positive film process is correspondingly changed, only tin plating rather than copper plating is performed at a window opening, over thick hole copper in a crimping hole (part of a second through hole) by electroplating in the case of pattern electroplating can thus be avoided, the crimping hole copper thickness is not affected by the pattern electroplating process, and the hidden danger that over thick hole copper in the crimping hole to result in a small crimping hole can be effectively prevented. Besides, etching processing is carried out after back drilling, the aperture burrs formed at the aperture in the case of back drilling can be removed, and thus, through the method disclosed in the invention, the problems of the aperture burrs of the back drilling hole and the problem of a small crimping hole can be improved at the same time.

The invention provides a desolventizing humidifier which comprises a tank body, multi-layer sieve plates, a steam plywood case I and a discharge device. The multi-layer sieve plates are fixed in the tank body, the steam plywood case I is fixed on the tank body and arranged at the bottoms of the multi-layer sieve plates, and the discharge device is arranged in the tank body. The tank body comprises a steam outlet, a feed port and a discharge port, wherein the steam outlet is arranged at the top, the feed port is connected with a feed device, and the discharge port is arranged at the bottom of the tank body. The discharge device comprises a vertical shaft arranged in the center of the tank body and a drive mechanism driving the vertical shaft to rotate. A distribution device, scraper boards, a harrow rod I and a harrow rod III are fixed successively on the vertical shaft from top to bottom. The scraper boards are arranged above and matched with the multi-layer sieve plates, the harrow rod I is introversive and arranged above and matched with the steam plywood case I, and the harrow rod III is extroversive and arranged above and matched with the tank body bottom. Steam is fed into the steam plywood case I, and steam outlets are arranged on the upper portion of the steam plywood case I. Compared with the prior art, the desolventizing humidifier has the advantages of being high in solvent recovery rate and dephenolized cottonseed protein quality.

The invention provides a crystalline silicon solar cell and a manufacturing method of the crystalline silicon solar cell. The manufacturing method includes the steps that a crystalline silicon slice with PN junctions is used as a substrate, two layers of transparent conducting thin films are deposited on the front and the back of the substrate respectively, and electroplating copper grid line electrodes are arranged on the transparent conducting thin films on the front and the back of the substrate respectively. According to the crystalline silicon solar cell and the manufacturing method of the crystalline silicon solar cell, SiNx is replaced by TCO, and silk-screen printing silver grid lines are replaced by electroplating copper. Due to the fact that the silk-screen printing silver grid lines are replaced by the electroplating copper, electrode grid lines can be more exquisite, smaller in light shielding area, and lower in cost because silver is replaced by copper. Due to the fact that the TCO has high light transparency and electrical conductivity, antireflective films and the inactivation effect of the SiNx can be replaced, a certain effect for collecting current is achieved, the number of the grid lines can be reduced, more importantly, the electroplating copper can be resisted from infiltrating into silicon, and the defects in the process of directly electroplating copper on a silicon cell are overcome. In addition, cost of TCO production equipment is far lower than cost of SiNx production equipment. The TCO and the electroplating copper are combined, therefore, manufacturing cost is low, the preparing process is simple, and efficiency of the cell can be effectively improved.

The invention discloses a manufacturing method of an HDI plate back drilling hole. The method comprises the steps that a production board is drilled, drilled holes comprise a through hole needing backdrilling, and the through hole is metalized through electroless plating copper; a layer of thin copper is flash-plated on the production board through full-board electroplating, wherein the thicknessof a thin copper layer formed during flash-plating is 5 to 8 microns; tin is electroplated on the production board to enable the board surface copper layer and the hole copper to be covered by the tin layer; depth-controlled back drilling is carried out on the through hole needing back drilling according to the design requirement, so that the copper layer at the back drilling part in the throughhole is removed, and a stepped back drilling hole is formed; acid etching treatment is carried out on the production board, and tin is removed; and full-board electroplating treatment is carried out on the production board, and the board surface copper layer and the hole copper are plated to the thickness required by the design. According to the method, by optimizing the production technological process, the problem that a conventional etching process cannot solve the problem of hole blocking of a back drilling burr copper wire is effectively solved; back drilling manufacturing of the HDI plate is achieved; and the percent of pass is high.

The invention relates to a desulphurization pump with a combined impeller rotor. The desulphurization pump comprises the combined impeller rotor, a pump case, a pump inlet part, a pump outlet part anda pump back cover plate, wherein the pump inlet part, the pump outlet part and the pump back cover plate are installed on the pump case to form a pump cavity for containing the combined impeller rotor in an enclosure manner; the combined impeller rotor comprises an impeller body installed on a pump shaft, the impeller body comprises a metal hub lining and a nonmetal blade lining body with which the peripheral surface of the metal hub lining is wrapped in a compression-molding manner, and the nonmetal blade lining body is made from an ultrahigh molecular weight polyethylene material. Accordingto the desulphurization pump with the combined impeller rotor, the deadweight of the impeller body is reduced, and the material cost is saved; in addition, the strength of the impeller body is also guaranteed while it is avoided that the impeller rotor is too thick; the impeller body is resistant to wear and corrosion, and a vibration value of the pump can be reduced; meanwhile, processing is easy, the cost is low, and the running efficiency of the pump is greatly improved.

The invention belongs to the technical field of hardware plate machining, and particularly relates to a plate surface treatment device. The plate surface treatment device comprises a grinding box, a bearing, electric push rods, a first air bag, a second air bag, a movable plate, a screw rod, grinding wheels, a circular plate, a hardware plate, a first air cylinder, an elastic rope, a gear and an arc grinding plate; the electric push rods drive the movable plate to move up and down, and the movable plate moves up and down to drive the screw rod to rotate; the screw rod rotates to drive the circular plate to rotate; the circular plate rotates to drive the gear to rotate, and the gear rotates to drive the arc grinding plate to polish the hardware plate; the first air bag and a third air bag are used for grinding hardware plate on the arc grinding plate, the arc grinding plate and the hardware plate can be prevented from being clamped; when the arc grinding plate is used for grinding the hardware plate, the first air cylinder is contracted and restored to drive the hardware plate to move, so that the double-sided grinding is realized, the grinding efficiency is higher, and the grindingquality is better.

The invention discloses a saving-type environment-friendly electroplating spraying box. The saving-type environment-friendly electroplating spraying box structurally comprises a supporting frame, a spraying box, a control panel, a shielding cloth and a box door, wherein the upper end of the supporting frame is welded to the outer side of the spraying box. The water on the outer surface of a circular pipe is absorbed by a sponge pad, the gas is ejected from an air jet nozzle, the water on the outer surface of the circular pipe is completely removed, meanwhile a micromotor drives a rotating wheel to rotate, so that a rotating annular pipe rotate around a fixed sliding rail circumferentially, a coating in a conveying pipe is discharged into the rotating annular pipe, finally is ejected from arotating nozzle, circular bubbles with different sizes on a paint film of the outer surface of the circular pipe are prevented, the circular pipe is conveyed forward and enters into a supporting ring, a support bracket is extruded through the self diameter of the circular pipe, the bottom of the circular pipe is scraped with a scraping strip, so that surplus paint at the bottom of the circular pipe is scraped, a coating at the bottom of the circular pipe is prevented from being too thick, the smoothness of the paint film is ensured, and falling blocks are prevented.

The invention relates to a compound impeller rotor. The compound impeller rotor comprises an impeller body installed on a pump shaft, the impeller body comprises a metal hub lining and a non-metal blade lining body wrapped and machined on the peripheral surface of the lining of the metal hub in a compression molding mode, and the non-metal blade lining body is composed of an ultrahigh molecular weight polyethylene material. The impeller body is compounded by two materials of metal and plastic. Excellent abrasive resistance of ultrahigh molecular weight polyethylene and high strength of metal are combined, the weight of the impeller body is reduced, and the material cost is reduced; in addition, the phenomenon of high thickness of the impeller body is avoided, and the strength of the impeller body is ensured. The impeller body is wear-proof and corrosion-proof, in addition, the unbalanced eccentric torque and starting inertia of the impeller body are reduced, and the balance degree of the impeller body is ensured; the dynamic balance degree of the impeller body is ensured, the vibration valve of a pump can be conveniently reduced, the rotor is easy to machine and low in cost, and the running efficiency of the pump is greatly improved.

The invention discloses a household smell security system. The system comprises a smell detection unit, a smell comparison unit, a processing unit, and a control unit, the smell detection unit, the smell comparison unit, and the processing unit are connected to the control unit, the smell detection unit is used for detecting indoor smell and sending the detected smell concentration value to the smell comparison unit, the smell comparison unit is used for receiving the smell concentration value sent by the smell detection unit, comparing the smell concentration value with a preset smell concentration value, and sending a comparison result to the control unit, and the control unit is used for controlling the processing unit to conduct processing operation according to the comparison result of the smell comparison unit. According to the household smell security system, household smell can be well protected in an effective manner, and over-strong or sharp smell can be eliminated.

The invention relates to a preparation method of bituminous concrete, and the preparation method uses a device assisting in the preparation of the bituminous concrete. The device assisting in the preparation of the bituminous concrete comprises a supporting base, a stirring mechanism and an overturning mechanism, wherein the supporting base is of a box body structure with an upward opening; the stirring mechanism is arranged at the middle part of the supporting base; and the overturning mechanism is mounted at the lower end of the stirring mechanism. The preparation method of the bituminous concrete can solve the problem that when bitumen materials are fed into an existing device for preparing the bituminous concrete, bitumen can not be heated and emulsified, and the bitumen materials andconcrete materials can not be thoroughly and uniformly stirred, resulting in the influence on the grading ratio of the bitumen to concrete and the influence on the viscosity of formed bituminous concrete. The preparation method of the bituminous concrete can also solve the problem that the inner wall of a stirring tank can not be scraped clean in time, and solidified bitumen is prone to be adheredto stirring blades, resulting in the accumulation of a thick bitumen layer after long-time use, the influence on the stirring quality of the bituminous concrete, low efficiency of stirring and mixing, and the influence on the using quality of the bituminous concrete.

The invention discloses an inflation amount control method and system. According to the inflation amount control method, an inflation amount correction factor is determined according to obtained mixedgas parameters after obtaining measurement inflation parameters of a motor vehicle and judging that the measurement inflation parameters meet a correction condition, the measurement inflation parameters are corrected by using the inflation amount correction factor, and corrected inflation parameters are obtained, so that the inflation amount of the motor vehicle calculated according to the corrected inflation parameters is close to the actual air inflow in an engine, and the purpose that the corrected inflation parameters are closer to the actual air inflow of the engine is achieved. The situation that mixed gas in an air cylinder is too thick or too thin due to the fact that the oil injection amount calculated by the engine according to the inflation amount with the large deviation fromthe actual inflation amount has the large deviation from the actually-needed oil injection amount is avoided, and the running smoothness of the motor vehicle is improved.

Provided is a coal-oil slurry heating furnace system using a thermal circulation liquid stream in the process of hydrogenating direct liquefaction of coal. The thermal circulation liquid material obtained from an outlet material of the coal-oil slurry heating furnace or a downstream front reactor of coal liquefaction is returned to the inlet of the heating furnace through a circulation pump, and optimization of a flow pattern, increase of the temperature of the liquid material in the furnace and shortening of the heating time can be achieved by flexibly regulating the flow rate of the liquid material in a heating furnace tube, so that improvement of the heat transfer efficiency, slow-down of coking in the furnace tube, slow-down of corrosion of the furnace tube and increase of the flexiblerange of flow operation of the coal-oil slurry feed are facilitated, decrease of the temperature shock amplitude of an inlet pipeline of the heating furnace is facilitated when the coal slurry is interrupted, and expanding of the range of coal types for a coal hydrogenating direct liquefaction device is facilitated.