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An alkaline non-cyanide plating solution for copper-plating used on iron and steel base and a preparation method thereof relate to a kind of plating solution. The invention provides the alkaline non-cyanide plating solution for copper-plating used on iron and steel base and the preparation method thereof. The plating solution comprises the following components: main salt, complexing agent, conductive salt, activator, cuprous ion complexing agent, pH stabilizer and brightening agent. The method comprises the following steps: adding complexing agent in water, stirring to dissolve complexing agent, obtaining a solution A; adding main salt in the solution A, stirring to dissolve main salt, obtaining a solution B; adding conductive salt in water, stirring to dissolve conductive salt, obtaininga solution C; mixing the solution B and solution C, adjusting the pH value to 2.0-4.5 with sulfuric acid or sodium hydroxide, obtaining a solution D; adding additive in the solution D, adding water toperform constant volume process and obtaining the alkaline non-cyanide plating solution for copper-plating in the desired volume for use, wherein the additive is activator, cuprous ion complexing agent, pH stabilizer and brightening agent.

The invention relates to a chisel holder system which comprises a base part and a chisel holder. The base part comprises a socket wherein the chisel holder comprising a plug-in insert is introduced. Said chisel holder which comprises a bearing surface is supported on a supporting surface of the base part, and the base part comprises a shoulder which is connected to the supporting surface. A replacement chamber is formed between the shoulder and a facing end surface of the chisel holder. According to the invention, the supporting surface is placed in the transition region in relation to the shoulder by means of at least one recess of the shoulder such that the flat-shaped connection between the supporting surface and the shoulder, in the region of the recess, is interrupted in order to optimise the resistance to wear and tear of the base part.

The invention relates to a Cu-Al connecting pipe provided with a rigid sleeve and a preparation method thereof. The welding head of a Cu pipe is provided with a conical solder side provided with a straight tubular guiding part; the external diameter of the guiding part is slightly less than the internal diameter of an Al pipe; the conical solder side of the Cu pipe and the internal wall of the Al pipe form direct chemical bond connection; the external sleeve of the Cu-Al connecting pipe is sleeved by a small section of a rigid sleeve; when in use, the rigid sleeve can prevent the cracking of the Al pipe caused by the bending of a butt joint and prevent the breaking of welding joint of the Al pipe or the Cu pipe in the sleeve. The rigid sleeve can avoid severe accidents such as the desquamating of welding joint and cracking of Al pipe near the joint and the like, prevents the generation of external splashing matter outside the welding joint, simplifies the process, relieves the destabilized deformation generated when the thin walled Cu pipe bears high pressure in the axial direction, increases the length of no-eutectic tissue welding seam, and is especially applicable to the welding of thin walled Al pipe and thin walled Au pipe.

The invention discloses a healthcare electronic cigarette juice capable of preventing and curing decayed teeth. The health electronic cigarette juice mainly contains 3-5%w / v of a tobacco extract, 40-50%w / v of propylene glycol, 10-15%w / v of purified water, 3-5%w / v of a tobacco flavor, 0.2-1%w / v of a stabilizer, 3-8%w / v of a thickener, 0.5-4%w / v of xylitol, 0.5-4%w / v of L-arabinose and 3-9% w / v of sodium fluoride solution. As the healthcare electronic cigarette juice capable of preventing and curing the decayed teeth contains the xylitol and the sodium fluoride, the healthcare electronic cigarette juice has the effect of preventing and curing the decayed teeth, and increasing the teeth strength; and the cigarette juice can also have healthcare function and prevent and cure the decayed teeth of oral cavity and teeth while enjoying smoking and smoke exhalation.

The invention discloses a copper and a chemical plating tin liquor of copper alloys and each liter of chemical plating tin liquor consists of materials with the following components: organic mixed acid: 150g / 1 to 500g / 1; organic pink salt: 50g / 1 to 100g / 1; organic silver salt: 1g / 1 to 5g / 1; complex agent: 45g / 1 to 200g / 1; reducing agent: 30g / 1 to 60g / 1; stabilizing agent: 10g / 1 to 80g / 1; emulsifying agent: 5g / 1 to 20g / 1; brightening agent: 3g / 1 to 20g / 1 and de-ionized water as the rest. With the chemical plating tin liquor, the copper and alloy surfaces can simply and rapidly form a bright and flat tin layer which does not form tin whiskers and has a certain thickness only needing chemical tin plating treatment for 4 to 8 minutes. The copper and the chemical plating tin liquor are suitable for not only circuit boards which are coated with coppers or copper alloys but also tinning corrosion resistance of other copper materials, etc.

The invention discloses a technology for treating and recycling a fracturing flow-back fluid of an oil and gas field. The technology comprises the steps as follows: oil-separation recovery is performed on a waste fluid of the fracturing flow-back fluid, so that a recovered waste fluid is obtained; the recovered waste fluid is degraded, so that a degraded waste fluid is obtained; flocculation and flotation are performed on the degraded waste fluid, so that floccules are obtained; and the floccules are separated from the fluid, so that a fluid for preparing an oil and gas field fracturing fluid is obtained. According to the technology, sump oil and waste fluid resources are recycled fully, and the treated waste fluid satisfies a standard requirement of preparation of the fracturing flow-back fluid.

The invention relates to a vacuum welding method for preventing a laser seam from generating pores. A vacuum welding device for preventing the laser seam from generating the pores is designed for the method. The vacuum welding device comprises a laser, a welding chamber, a focusing head and a vacuum pump; the laser and the vacuum pump are located outside the welding chamber; one end of the focusing head is connected with the laser through a laser conducting cable; the other end of the focusing head is inserted into the welding chamber; a pre-vacuum-pumping chamber is arranged on one side of the welding chamber; a postwelding sampling chamber is arranged on the other side of the welding chamber; the welding chamber is communicated with the pre-vacuum-pumping chamber and the postwelding sampling chamber; the pre-vacuum-pumping chamber, the welding chamber and the postwelding sampling chamber are communicated with the vacuum pump. The vacuum welding device and method for preventing the laser seam from generating the pores can prevent from generating the pores when the laser seam is solidified, the process is simple, and operation is convenient.

A washing machine that prevents failure of electrical parts, etc. caused by a large amount of detergent foam generated during washing. The washing machine comprises a rotating drum (31) with a rotating center shaft in a horizontal direction or an inclined direction; a water tank (33) wrapped around the rotating drum (31) and elastically supported; a water supply valve ( 44); the water level detection device (46) for detecting the water level in the water tank (33); the drain valve (43) for discharging the water in the water tank (33); the control device (48) for controlling actions such as washing, rinsing, and dehydration ), according to the signal change of the water level detection device (46), detect the generation state of the detergent foam in the water tank (33), control the subsequent defoaming process, washing process, rinsing process, water supply device and drainage device, thereby preventing the occurrence of The detergent foam adheres to electrical parts, causing them to malfunction, etc.

The invention relates to a mite-removing laundry liquid which comprises the following main active components in parts by mass: 5-10 parts of dodecyl dimethyl lycine, 7-12 parts of sodium alcohol ether sulfate, 6-10 parts of fatty alcohol polyoxyethylene ether, 4-8 parts of sodium linear alkyl benzene sulfonate, 0.5-1 part of antibiotic mildewproof miticide (MGU-350), 0.2-0.5 part of chelator and 1-5 parts of thickening agent. The mite-removing laundry liquid has the advantage of strong detergency, does not damage the surface and has the effect of removing mites.

The invention discloses a formula of a non-gelatin soft capsule shell. The soft capsule shell is prepared from the following components in percentage by weight: 25-75 percent of modified starch, 10-30 percent of carrageenan, 10-25 percent of a plasticizer, 40-50 percent of water, 2-12 percent of a thickening agent and the balance of pigment which can be added according to the required color of the soft capsule pill. According to the formula, the main component gelatin of a traditional capsule shell material is replaced by modified starch and carrageenan, so that multiple defects of gelatin can be overcome, the modified starch has the characteristics of film performance, air resistance, adhesion and the like, has high safety performance and good elasticity, and has the dissolving speed superior to that of gelatin; the soft capsule prepared from modified starch and carrageenan has stable property, and cannot easily perform a crosslinking phenomenon; and the soft capsule prepared by using gelatin replacing materials does not have the problem of oxidation crosslinking, and an antioxidant does not need to be added.

The invention relates to a construction paint, particularly a lithium-base permeable crystallization cement sealing and solidifying agent. The cement sealing and solidifying agent is composed of 15-20 parts of sodium silicate, 8-15 parts of lithium metasilicate, 3-5 parts of magnesium fluosilicate, 2-4 parts of sodium dihydrogen phosphate, 0-6 parts of water-based color paste for paint and 50-70 parts of water. The construction technique comprises the following steps: new ground: troweling the new ground, carrying out primary hardening, coating the solidifying agent, completely drying and curing, flushing the ground with clear water, naturally drying, and sanding and polishing with a sander; and old ground: sanding and cleaning the old ground, coating the solidifying agent, naturally drying, cleaning the ground, naturally drying, and sanding and polishing (or additionally coating solidifying agent, cleaning the ground, naturally drying, and sanding and polishing). By using the solidifying agent and construction technique, the strength, hardness and compactness of the concrete are greatly enhanced, and the durability and weathering resistance of the concrete are effectively improved.

The invention relates to a brewing method of a whole fruit fermentation type green plum wine. The method comprises the following steps: a) cleaning and airing green plums, pouring the green plums in fermentation tank to mash, adding pectinase and sodium bisulfite for enzymolysis, and then adding distilled water, glycogen, yeast, diammonium hydrogen phosphate and sodium bisulfite to ferment; b) filtering the fermentation liquor, soaking the obtained pulp with ethanol solution, and adding glycogen, diammonium hydrogen phosphate and sodium bisulfite in the filtrate to ferment and obtain fermentation wine liquor; c) adsorbing the upper fermentation wine liquor with activated carbon, filtering to obtain supernatant, and distilling the lower fermentation wine liquor and the pulp which is soakedwith alcohol to obtain distillate; d) blending the supernatant and the distillate to obtain the green plum wine; and e) using a filtration membrane to filter and purify the green plum wine, and packaging to obtain the finished green plum wine. The green plum wine prepared by the brewing method has gentle mouth feeling and fresh flavor; owning to the faint scent of the plant extract, the green plum wine also has a special flavor; and the green plum wine has good stability, simple technology and low production cost.

The invention discloses a control method and an electronic device. The control method and the electronic device are used to solve the technical problem that a voice recognition engine can not be controlled to rapidly enter a work state in the prior art. The control method is applied to the electronic device. The electronic device comprises a voice recognition engine, and further comprises or is connected with a microphone. The control method includes: obtaining first airflow information collected through the microphone; judging whether the first airflow information meets a first preparatory condition or not; when the first airflow information meets the first preparatory condition, controlling the voice recognition engine to enter a second state.

The invention discloses a composite bar-reinforced ECC and concrete composite beam and a construction method thereof. The whole cross section of the composite beam is in a rectangular shape, and the composite beam comprises a fiber-reinforced cement-based composite material with concrete on the upper portion and interval grooves in the lower portion and an FRP bar-steel bar framework; in the FRP bar-steel bar framework, longitudinally-tensioned FRP bars are placed at the bottom of the beam, located on the inner sides of steel bar stirrups and bound together with the steel bar stirrups, longitudinally-tensioned steel bars are placed on the upper sides of the longitudinally-tensioned FRP bars, and a steel bar framework stud is placed on the top of the beam, located on the inner sides of the steel bar stirrups and bound together with the steel bar stirrups. According to the composite bar-reinforced ECC and concrete composite beam and the construction method thereof, on one hand, through the superior tensile property of the ECC material and the tiny crack mechanism, the dampproof and rustproof purposes are achieved while the bearing capacity and ductility of the composite beam are significantly improved; on the other hand, by mixing the FRP bars with the steel bar, the high strength and the corrosion resistance of the FRP bars and the ductility of the steel bar are fully utilized. The composite bar-reinforced ECC and concrete composite beam can be applied to beam components in building and bridge structures.

The invention discloses a metal smelting technology, and provides a waste copper pretreating and refining technology. The key points of the technical scheme are as follows: the waste copper is pretreated before smelting to remove dirt, sump oil and high-molecular compound on the surface of the waste copper product, so as to avoid polluted gas generated by the waste copper product in the smelting process and reduce production pollution; secondly the oxidation film such as aluminum oxide formed on the surface of the waste copper alloy product can be broken by the pretreatment, for example, the melting point of aluminum oxide is higher than the refining temperature, and aluminum oxide is easy to form into an interstitial solid solution when being refined and then is mixed with the copper alloy finished product, so that the quality of the finished product is reduced; in the follow-up refining process, the process route can be determined according to the final finished product: if the finished product is copper alloy, the alloy elements are added during the refining process to obtain the final product, and if the finished product is pure copper, the copper is cast into an anode plate after refining, and then is electrolytically refined to obtain the pure copper product.

The invention discloses an air conditioner. The air conditioner comprises a compressor, a reversing component, an outdoor heat exchanger, an indoor heat exchanger, a single-way throttle valve, a first coolant flow path and a second coolant flow path both which are connected in parallel, and an electronic control radiator unit. The single-way throttle valve comprises a first valve port and a second valve port, the first valve port is connected with the outdoor heat exchanger, the single-way throttle valve is totally conducted in a circulating direction from the first valve port to the second valve port, and the single-way throttle valve is served as a throttle component in the circulating direction from the second valve port to the first valve port. The first coolant flow path and the second coolant flow path are in series connected between the throttling element and the second valve port respectively, the first coolant flow path is in series connected with a first control valve and the second coolant flow path is in series connected with a second control valve. The electronic control radiator unit comprises an electronic control element and a radiator component, the radiator component is in series connected with the first coolant flow path. According to the air conditioner, condensed water cannot be generated on the electronic control element and the temperature of the electronic control element cannot be reduced to a lower valve.

In a liquid crystal display device provided with a backlight unit, creak reduction means is provided at least on one part of the areas where members constituting the liquid crystal display device such as the liquid crystal panel, the diffusion plate, the reinforcing plate, the frame of the liquid crystal display device and the back surface reflector for the backlight unit come into contact with each other. The creak reduction means may be a slippery film whose surface is fluorinated such as a fluororesin film, a polyacetal resin film, a polyethylene film, and a silicon coating film, or protrusions or protruding fins, or a friction reduction means such as silicon oil or fluorine oil, or a mutual displacement absorbing means such as a flexible sheet. By adopting such a constitution, it is possible to prevent noise from being generated due to mutual friction between the liquid crystal panel and the various members such as the diffusion plate, the reinforcing plate, the frame and the reflector for the backlight unit as a result of thermal expansion.

A resistive superconducting current limiter, by using a magnetic field generating device separated from the circuit of the power system, the current of the power system cannot flow to the linear coil of the resistive superconducting fault current limiting device when the normal current flows to the power system. It is possible to strengthen the current of the superconducting device, prevent the heat generated on the linear coil, and eliminate the magnetic field generated by the linear coil when the normal current is applied to the power system, and it is possible to use not only the BISCCO-based superconducting device, but also the YBCO-based superconducting device. guide device. The current limiter includes: a superconducting fault current limiting module, which is composed of at least one superconducting fault current limiting device; a magnetic field application unit, which is installed in a circular shape to surround the periphery of the superconducting fault current limiting module, with for applying a magnetic field to the superconducting fault current limiting module; and a current transformer for contactlessly inducing a current converted from a current flowing on a circuit of a power system, thereby applying the induced current to the magnetic field applying unit.

The invention discloses a dripping-proof low-bubble linkage type filling structure. The dripping-proof low-bubble linkage type filling structure comprises an air cylinder (1), a feeding device (2) and a filling head (3), wherein the filling head (3) comprises a material cavity (301); the material cavity (301) is internally provided with a material pushing rod (302); the top end of the material pushing rod (302) stretches out of the material cavity (301); the material pushing rod (302) is connected with a piston rod (101) of the air cylinder (1); a spiral discharging pipe (4) is arranged at the bottom end of the filling head (3); the feeding device (2) comprises a material storage bucket (201), a material pipe (202) and a material returning absorption cabin (203); the material storage bucket (201) is communicated with the material returning absorption cabin (203) through the material pipe (202); the material returning absorption cabin (203) is communicated with the material cavity (301); a solenoid valve (5) is arranged between the material storage bucket (201) and the material returning absorption cabin (203). The dripping-proof low-bubble linkage-type filling structure can sufficiently avoid dripping; dropped materials can be recycled to the material returning absorption cabin and the spiral discharging pipe is arranged at the bottom end of the filling head, so that a liquid impact force can be buffered sufficiently and bubbles are prevented from being generated in a filling process.

The invention discloses an automatic exhaust blood-return-resistant infusion apparatus. The infusion apparatus comprises a bottle plug puncture outfit protective sleeve, a bottle plug puncture outfit, an air filter, a dropping funnel, a flow regulator, a liquid medicament filter, a disposable venous infusion needle and the like and is characterized in that: a precision liquid medicament filtering membrane is arranged at a bottom end inside the dropping funnel; a concave cavity is formed in the middle of a bottom plate inside the dropping funnel; an annular plane is processed around the concave cavity of the bottom plate; the precision liquid medicament filtering membrane is tightly attached to the annular plane of the bottom plate by ultrasonic or high frequency heat seal; the concave cavity of the bottom plate can allow the liquid medicament flowing through the precision liquid medicament filtering membrane to be filtered fully; and an automatic venting device consisting of a venting plug, an air filter and a venting needle is arranged on a dropping funnel cover. The infusion apparatus has the advantages of venting automatically in an infusion process, automatically preventing the liquid medicament from flowing, preventing blood from flowing backwards, simplifying venting operation steps and reducing the working strength of medical care personnel, along with the advantages of simple structure, safety and reliability.

The invention relates to a low-frequency resonant activating cup for hydrogen rich water. The low-frequency resonant activating cup comprises a cup cover, a cup body, a base and a first battery, wherein the upper end of the cup body is connected with the cup cover; the lower end of the cup body is connected with the base; the cup cover comprises a cup cover shell and a polymer; the first battery is located in the cup cover shell; an electric control panel and an LED (Light-Emitting Diode) light source are arranged in the cup cover shell below the first battery in sequence; the electric control panel controls the LED light source; the polymer is located below the LED light source; the base comprises a base shell, and a hydrogen and oxygen separation hydrogen producing device and a second battery which are arranged in the base shell; the hydrogen and oxygen separation hydrogen producing device comprises an electrode plate A and an electrode plate B; the electrode plate A and the electrode plate B are provided with a plurality of through holes; the upper part of the electrode plate A is communicated with the cup body; an anodal water holding groove is arranged below the electrode plate B; an ionic membrane is arranged between the electrode plate A and the electrode B; the upper end of the anodal water holding groove and a space of the cup body are separated through the ionic membrane; the lower end of the anodal water holding groove is provided with a wastewater opening.

The present invention relates to konjak dietary fiber healthcare biscuits and a preparation method thereof. The konjak dietary fiber healthcare biscuits are prepared by the following raw materials including, by mass, 30-50 parts of konjak powder, 20-30 parts of compound dietary fiber, 20-30 parts of whole wheat flour, 20-30 parts of purple sweet potato powder, 20-30 parts of vegetable oil, 5-8 parts of white granulated sugar, 3-5 parts of xylitol, 8-10 parts of egges, 10-15 parts of water, and 1-2 parts of leavening agent, wherein the compound dietary fiber is composed of apple dietary fiber, pawpaw dietary fiber and bamboo shoot dietary fiber with a weight ratio of 3:1:1. The konjak dietary fiber healthcare biscuits have comprehensive nutrition and have good healthcare effects.

The invention belongs to the field of metal additive manufacturing, and relates to forging heads, a device and a method of electric arc additive limit stroke high-frequency micro-forging impact strengthening. The forging heads comprise a first forging head and a second forging head, the first forging head comprises a cylindrical first forging head base part and a first forging head forging part located at the top end of the first forging head base part, the first forging head forging part is provided with first forging head forging surfaces, the first forging head forging surfaces are symmetrically arranged on the four sides of the first forging head forging part, and the first forging head forging surfaces are planes, and are used for forging a cladding layer in the process of additive manufacturing to form the cladding layer. According to the designed impact forging heads, forging and modifying can be conducted on materials with different stress characteristics, and the forging efficiency is high; and the alloy materials are used, so it is guaranteed that the forging heads have the good toughness and hardness, and the additive manufacturing-forging-combined composite machining process efficiency is improved.

The invention relates to a vertical air conditioner. The vertical air conditioner comprises an air supplying device, an installation plate, an air blocking plate and a front panel. The air blocking plate is arranged on the radial inner side of the front panel. The installation plate is arranged on the radial inner side of the air blocking plate. The installation plate and the air blocking plate are connected in a sealed manner. A body air way is formed between the installation plate and the air blocking plate. The air supplying device is installed on the installation plate. By means of the vertical air conditioner, the air blocking plate is arranged on the inner side of the front panel and can separate cold air in the air conditioner from the front panel, and therefore generation of condensate water on the outer side surface of the front panel can be reduced.

The invention discloses a preparation method of propyl trimethoxy silane. The method comprises the steps that propyl trichlorosilane and methanol are respectively measured through a flowmeter according to the mass ratio being 1.5 : 1; the methanol passes through a heating tank after being vaporized through a vaporizing tank, and then enters the bottom of an esterification column; the propyl trichlorosilane enters the esterification column from the top and is sprayed down; principal products at the bottom of an esterifying kettle is pumped into the top of the esterification column through a centrifugal pump; methanol gas flowing through the esterification column performs gas stripping to residual HCl in the principal products so as to take away HCl while the principal products drop down; after the principal products drop down to the bottom of the esterifying kettle, the principal products are pumped into a neutralizing kettle through a delivery pump; saturated sodium methoxide solution is dropwise added into the neutralizing kettle to be conducted to neutralizing; and propyl trimethoxy silane crude products are obtained after filtering; the propyl trimethoxy silane crude products are pumped into a rectifying tower to be rectified; and after impurities are separated, propyl trimethoxy silane finished products are obtained. The method solves the problems of the comprehensive utilization of side products in the industrial product of gamma-chloropropyl trichlorosilane, has the characteristics of high production efficiency, stable process and high quantity of production, and improves the product yield and purity, thereby realizing the continuity of the process.

The invention discloses a method for preparing nano copper powder in a micromolecular viscous medium. The method comprises the steps of: by taking a surface active agent, salt, a complexing agent, an antifoaming agent, an antioxidant, cupric salt, a reducing agent and deionized water as raw materials and according to the proportion of (0.001-95 percent) : (0.001-95 percent) : (0.001-80 percent): (0.001-75 percent): (0.001-70 percent): (0.001-75 percent): (0.001-70 percent): (0.001-98 percent), preparing the micromolecular viscous medium by using the surface active agent, the salt, the complexing agent, the antifoaming agent, the antioxidant and the deionized water; adding the cupric salt and uniformly mixing; adding the reducing agent and mixing; adding the deionized water to dilute so asto reduce the degree of viscosity according to a mass ratio of 1:0.5-10 of the total quantity of all materials abovementioned to the deionized water after the reaction completes; and obtaining nano copper powder through filter-pressing, deionized water washing, acetone washing and vacuum drying. According to the method disclosed by the invention, the raw materials selected in the invention are easily available, the manufacturing technique is simple and short, the production efficiency is high, the production cost and the energy compunction are low, and powder has low possibility of agglomeration and has good dispersibility, therefore the method is suitable for large-scale production and solves the problems of easy oxidation and easy agglomeration of the nano copper powder existing in the traditional chemical preparation method.

The invention relates to a formula of a soft capsule shell, which comprises gelatin, water, glycerol and sorbitol. The formula is characterized in that the proportion of a plasticizer (namely glycerol) and sorbitol is adjusted, and the components are as follows by weight percentage: gelatin 80-100%, water 60-80%, plasticizer 40-60%, antioxidant 0.2-1.2%, and PEG-400 (polyethylene glycol-400) 5-15%. Due to high requirements of soft capsules for the plasticity of shell materials, the moisturizing property of sorbitol is considered and the shell is ensured not to cause softening, deformation, adhesion, liquid leakage and other problems of the soft capsule due to excessive water content, so that the plasticizer is mixed for use to ensure the stability of the capsule. The antioxidant can prevent crosslinking due to oxidation reactions among the substances in the shell material, so as to cause time delay in disintegration of the soft capsule. The addition of the antioxidant in the formula provided by the invention can effective inhibit oxidation, so as to ensure the disintegration of the soft capsule and improve the quality of the shell material.

The invention provides a foam removing method for a cylinder washing machine, which primarily includes the following steps: 1. supplying water and detergent to the washing groove before washing; 2. washing according to the predetermined time after the water is supplied to the predetermined water level; 3. detecting water dissolved detergent concentration after washing in predetermined time; 4. comparing the detected detergent concentration to the predetermined one, then washing in accordance with one of multiple predetermined washing methods. Said method detects the detergent concentration in the washing course to judge whether the foams produce or not, if the detergent concentration is under the set value, then washing with ordinary washing method; otherwise, washing with water level, washing time and mode changed washing method. So the invention can prevent foam production during washing to improve the washing performance.