42results about How to "Low chance of exposure" patented technology

The invention provides electronic equipment. The electronic equipment comprises a shell, a camera decorating part and an electroacoustic assembly, wherein the camera decorating part is fixed to the shell and protrudes relative to the appearance face of the shell; the camera decorating part is provided with a top close to the appearance face, a bottom opposite to the top and a sound guide hole extending from the top to the bottom, the sound guide hole penetrates through the peripheral side wall, close to the appearance face, of the decorating part, the electroacoustic assembly is fixedly connected with the bottom and is aligned to the sound guide hole, and the sound guide hole can conduct external sound to the electroacoustic assembly. The sound guide hole penetrates through the peripheralside wall, adjacent to the appearance surface, of the camera decorating part, so that the sound guide hole is relatively hidden in appearance, the appearance integrity of the electronic equipment is improved, the probability that the peripheral side wall, adjacent to the appearance surface, of the camera decorating part makes contact with the surface of a foreign object or the hand of a user is small, and dust or water can be prevented from invading the sound guide hole.

The invention discloses a making method of fiber softening type areca seeds with prolonged quality guarantee period. The making method comprises the following steps of sorting raw materials, and performing cleaning; performing soaking treatment; performing corruption gas explosion treatment so that fibers are softened; performing vacuum seed germinating so as to improve the juice feeling when people chew areca seeds; roasting the seeds: performing vacuum drying; performing glue applying, and performing glue covering; performing seed cutting, and removing kernels; performing solidification withbrine, and performing airing; and performing packing and performing sterilization, so as to obtain the fiber softening type areca seeds with prolonged quality guarantee period. The invention aims toprovide the making method of the fiber softening type areca seeds with prolonged quality guarantee period. According to the making method, through steam explosion, on one hand, cellulose in the arecaseeds can be softened, the condition of enabling the areca seeds to be tasteful through fermentation liquid is facilitated, and on the other hand, the juice chewing feeling of the areca seeds can be improved in a focused manner; and besides, through vacuum seed germinating and seed roasting, the contact probability of the areca seeds and bacteria can be greatly reduced, and the quality guarantee period of products can be greatly prolonged to half a year or above.

The invention provides a silt curing agent prepared from steel slag modified phosphogypsum and a use method thereof. The silt curing agent comprises the following components: 40-70% of steel slag modified phosphogypsum powder, 30-60% of a cementing agent and 1-10% of a reinforcing agent, wherein the steel slag modified phosphogypsum powder is formed by mixing and modifying 5-25% of steel slag and75-95% of phosphogypsum by mass percentage. According to the invention, phosphogypsum is firstly modified by steel slag, alkaline substances of the steel slag react with soluble phosphoric acid, calcium phosphate and fluoride impurities contained in the phosphogypsum to be converted into insoluble precipitate substances, the adhesion among crystals in increased, so that the bonding performance ofphosphogypsum is improved, and meanwhile, acidic substances like sulfuric acid and phosphoric acid in the phosphogypsum are mixed with the steel slag to destroy the vitreous structure in the steel slag, so that the compact silicate vitreous structure in the steel slag is dissociated, the hydration activity of the steel slag is improved, and the strength of silt cured by the curing agent is furtherimproved.

The invention provides a biochemical recovery second-generation toilet seat and a matching apparatus thereof, wherein urination and defecation are divided in the toilet seat; a full-automatic odor blocking apparatus is arranged under a defecation channel; five holes are arranged on a urination discharging tank; a urination storage pipeline is arranged under the urination discharging tank; and a hole site is reserved at the back of a branch pipe for connecting a feces delivery pipe and the toilet seat, and a connecting pipe is connected on the hole site. The port of a plastic bucket with non-glue dry powder is pressed, a center hole connecting pipe is inserted into an air bag in the bucket, and the non-glue dry powder can be sprayed to the branch pipe through the connecting pipe; and after a user uses the toilet, a panel is covered, a handle at the front end of the toilet seat is lifted, and a piercing cross bar which is arranged on a connecting rod screwed at a center hole overcomes the tensile force of a spring arranged on the connecting rod while ascending so that a gag at the lower end of the connecting rod goes upwards from a urination outlet along a guide railing barrel and urine flows out of the urination outlet to wash the baffle plate of the full-automatic odor blocking apparatus and defecation reserved in the branch pipe and supported by the non-glue dry powder, thus achieving the purpose of flushing a toilet without water or with a little water.

The invention discloses an RH vacuum powder spraying refining device and a powder spraying method thereof, and belongs to the technical field of molten steel external refining. The RH vacuum refiningpowder spraying device comprises a vacuum molten steel circulating device and a powder spraying device. The vacuum molten steel circulating device comprises a vacuum chamber, a dip pipe, a steel ladleand a lifting gas pipeline. The powder spraying device comprises a powder spraying element, a powder supply pipe, a buffer gas chamber and a quick connecting part. The powder spraying method comprises but is not limited to refining and alloying functions of desulfurization, deoxidation, inclusion removal, alloy addition and the like. The RH vacuum powder spraying refining device and the powder spraying method thereof have the advantages that the bottom of a vacuum tank is improved on the basis of an RH conventional structure, and spray pipe mounting parameters can be adjusted to meet the process requirements of different steel types; and implementation is easy, maintenance is convenient, the production efficiency can be improved, the production cost is saved, and the application prospectsare good.

A full-automatic solution preparing and injecting device for polishing comprises a polishing solution bottle, a brushless water pump, a polishing solution stirring rotor, a liquid level sensor, a polishing solution stirring motor, an automatic feeding unit, a feeding motor, connecting screw rods, a storage bottle, a polishing powder stirring rotor, a polishing powder stirring motor, a power supply, a controller, an alternating current contactor and an electromagnetic water valve. The full-automatic solution preparing and injecting device can be used for automatically preparing and injecting a polishing solution for polishing, the reliance on operators during polishing is greatly reduced, the automation degree of polishing is improved, the problem that the operators must prepare the polishing solution on site regularly is solved, and the safety problem that the operators inevitably suck in polishing powder during the preparation of the polishing solution is also solved.

The invention discloses a sulfur / titanium dioxide / pyrolytic carbon composite positive electrode material for an aluminum ion battery, a preparation method for the sulfur / titanium dioxide / pyrolytic carbon composite positive electrode material, and the aluminum ion battery. The composite positive electrode material adopts a core-shell structure; the inner core of the core-shell structure is elemental sulfur while the shell of the core-shell structure is a coating layer which is formed by nanometer titanium dioxide, carbon nanotubes and porous asphalt pyrolytic carbon in a compounding manner, wherein the mass ratio of the elemental sulfur to the nanometer titanium dioxide to the carbon nanotubes is (0.5-5) to (1-5) to (0.1-1); and the mass ratio of the nanometer titanium dioxide to the porous asphalt for forming the pyrolytic carbon is (1-5) to (1-10). The composite positive electrode material has the characteristics of high electrical conductivity, stable structure, high compatibility with an electrolyte, and the like, so that the rate capability and cycle performance of the composite material are improved; and when the sulfur / titanium dioxide / pyrolytic carbon composite positive electrode material is used as the positive electrode material of the aluminum ion battery, the energy density, the low-temperature performance and the cycle performance of the battery are improved.

The invention discloses a preparation method of a high-strength aluminum porcelain insulator porcelain body, and the method comprises the following steps: raw material preparation, blank making, glazing, firing and cooling. According to the invention, a traditional sintering mode and a traditional cooling mode are changed by adding low-content sodium tripolyphosphate, and porcelain sand is added during the glazing; the porcelain body prepared by the method has compact structure and high bending strength, and is suitable for industrial production.

The invention relates to a rotary injection device for alkaline dry battery electrolyte, comprising a first workbench (2), a second workbench (3) and an intermediate turntable (4) which rotate synchronously with a host main shaft (1), and an injection mechanism (10 ), the injection mechanism (10) includes a first cylinder (100), an injection rod (101) and a spray gun (102), and the spray gun (102) is arranged on the base plate (1004) of the first cylinder (100), the The bottom plate (1004) is provided with a moving groove (10040) for the spray gun (102) to rotate and move, and also includes a spray gun connecting rod (1023) connecting the spray gun (102) as a whole, and the spray gun connecting rod (1023) is connected to set There is a motor (1024), and the motor (1024) drives the spray gun (102) to move along the rotational movement slot (10040). The electrolyte absorption mode in the injection mechanism of the present invention is negative pressure absorption, and the electrolyte enters the interior of the battery by being thrown out, so the absorption effect is better.

The invention discloses a stirring barrel and a method for preparing environmentally-friendly cutting oil by using the stirring barrel, and belongs to the technical field of metalworking. According tothe main technical points, the stirring barrel comprises a barrel body with an opening in the upper end; a discharging pipe is arranged at the lower end of the barrel body; a rotating shaft is connected in the barrel body in a rotating mode; the lower end of the rotating shaft extends into the barrel body and is provided with a stirring assembly; a mounting base is arranged at the center of the upper end of the barrel body; the stirring assembly comprises a shaft sleeve disc, a fixing disc, a plurality of stirring shafts and and a driving assembly, wherein the shaft sleeve disc is fixedly connected to the mounting base, the fixing disc is fixedly connected to the rotating shaft, the stirring shafts are connected to the peripheral side of the fixing disc, and the driving assembly is arranged on the rotating shaft; the driving assembly comprises a main gear, secondary gears and a motor, wherein the main gear is fixedly connected to the rotating shaft, the secondary gears are fixedly connected to the corresponding stirring shafts, and the motor is arranged above the mounting base; and each secondary gear is arranged outwards in the radial direction of the fixing disc and meshes withthe main gear. The stirring barrel and the method have the advantages that the operation is convenient and simple, in addition, the contact probability between the cutting oil and oxygen can be lowered, and therefore the quality of the environmentally-friendly cutting oil can be improved.

The invention discloses a blending bucket and a method for preparing cold heading oil with the same, and belongs to the technical field of metal processing. The blending bucket is technically characterized by comprising a bucket body which is open at the upper end, wherein a discharging pipe provided with a valve is arranged at the lower end of the bucket body; a revolving shaft is rotationally connected into the bucket body; a stirring assembly is arranged at the lower end of the revolving shaft; a mounting base is arranged at the upper end of the bucket body; the stirring assembly comprisesa box, a plurality of stirring shafts which are connected to the periphery of the box through bearings, and a driving assembly mounted on the revolving shaft; the driving assembly comprises a first bevel gear which is fixedly connected to the revolving shaft, second bevel gears which are fixedly connected to corresponding stirring shafts respectively, and a motor which is mounted on the revolvingshaft; each second bevel gear is arranged outwards along the radial direction of the revolving shaft, and is meshed with the first bevel gear. By adopting the blending bucket, the mixing effect of thecold heating oil can be improved. The preparation method is convenient and easy to operate, and the probability of contact between the cold heating oil and oxygen can be reduced, so that the qualityof the cold heading oil is improved.

The invention relates to an electrolyte solution negative pressure rotational absorption device for an alkaline dry cell. The device comprises a base (1), a stand column (2) fixed with the bottom plate, and a top plate (3) fixedly arranged at the top of the stand column, wherein a supporting cup rotation mechanism (6) is arranged on a driving shaft (4); and a plurality of supporting cups (8) for mounting a battery (7) are uniformly distributed on the supporting cup rotation mechanism (6). The device further comprises a negative pressure absorption structure (9) used for enabling the battery (7) to be in a negative pressure state and then injecting an electrolyte solution into the battery (7), and two spray guns (92) used for injecting the electrolyte solution into the battery (7) centrifugally. According to the technical scheme, the problem that the electrolyte solution is not fully absorbed in a normal pressure state is solved; the injection and absorption processes of the electrolyte solution are combined together; and the electrolyte solution is rotationally absorbed, so that the absorption efficiency of the electrolyte solution is high.

The invention discloses a pole injecting device capable of achieving automatic physical disinfection. The pole injecting device is composed of a pole injector, a power source, a spring, a shell, and an ultraviolet lamp. When the pole injecting device is in use, since the pole injector is utilized, remote-distance injection can be implemented, the trouble that the action of injection operation which can be implemented only when operational personnel jump into an animal fence is saved, thus the working efficiency is improved, and the amount of animals injected in unit time is sharply increased; meanwhile, the probability of the contact of the animals and the operational personnel is lowered, and thus mutual cross infection (contamination) is prevented. Besides, when the pole injecting device is in use, the feature that the wave length of ultraviolet c (UVC) is 200-275 nm and is within a microbe absorption peak range, and the ultraviolet c (UVC) can kill virus and germs within one second by destroying DNA(RNA) structures of microorganisms is utilized, so that a needle tip is quickly disinfected. The purpose that one needle can be used for injecting continuously without being replaced is achieved, and pestilence cross infection among animals is also effectively avoided. Besides, the time spent for disinfecting the needle tip through the ultraviolet is short, and the medicine quality is not influenced.

The invention provides a plant quarantine tissue slice device comprising a cutter and a second connecting pipe; a pumping groove is a chamber groove structure, front and rear plate-like structure support vertical plates are arranged on the bottom surface of the pumping groove, a sampling box and a culture liquid storage tank are further installed from the left to the right on the bottom side of the pumping groove, a rectangular structure notch is arranged on the rear wall, near the left side, of the inner cavity of the pumping groove; a first connecting pipe is connected to between the cultureliquid storage tank and a second connecting pipe, and the other end of the second connecting pipe is connected to a funnel; the plant quarantine tissue slice device is used to sample a stem of a plant, the plant quarantine tissue slice device is relatively closed, and can simultaneously realize the synchronous and relatively-closed dripping of a culture liquid. Compared with the existing plant quarantine tissue slice sampling device, the plant quarantine tissue slice device has higher operability, and greatly reduces the probability of contact with the outside air during sampling, and the sampling process is relatively more closed, so that when subsequent sampled samples are observed by a microscope, the effect is better.

The invention discloses a diaphragm laser cutting device. The diaphragm laser cutting device comprises a laser generator, a locating tool and a position adjusting mechanism, wherein the laser generator is used for enabling diaphragm ring single bodies to be cut out on a diaphragm, the locating tool is used for fixing the diaphragm, and the position adjusting mechanism is used for adjusting the relative position of the locating tool and the laser generator. According to the diaphragm laser cutting device, mass cutting can be carried out on vibrating diaphragms of electret microphones by using laser equipment, and the cutting precision of the vibrating diaphragms is high.

The invention discloses a qualitative detection method for wind-heating cold particles. The method comprises the steps of 1) taking the wind-hot cold particles, adding ethanol, heating to boiling, filtering after cooling, and obtaining a filtrate; performing a ninhydrin chromogenic reaction or a fluorescence reaction on the filtrate; 2) taking the wind-hot cold granules to prepare a test solution,taking forsythia suspensa vahl control medicinal materials to prepare a control medicinal material solution, and testing according to a thin layer chromatography method; 3) taking the wind-heat coldgranules as the test solution; taking the mint medicinal material to make the reference medicinal solution; testing according to thin layer chromatography; 4) taking the wind and heat granules as thetest solution; taking the burdock medicinal materials to prepare the reference medicinal solution; testing according to thin layer chromatography. The method can accurately determine the authenticityof the variety. Further, the method can avoid the one-sidedness of determining the quality of the drug by merely measuring a single component.

The invention relates to a high-efficiency rotating injection mechanism for an electrolyte. The high-efficiency rotating injection mechanism comprises a work bench (1), a sliding block (2), an injection barrel (3) and spray gun connecting rods (323), wherein the sliding block (2) is movably arranged on the work bench (1); the injection barrel (3) comprises a first barrel body (30), injection rods (31) and spray guns (32); the spray guns (32) are arranged on a bottom plate (303) of the first barrel body (30); rotary mobile grooves (3030) for the spray guns (32) are formed in the bottom plate (303); the spray gun connecting rods (323) connect the spray guns (32) into a whole; the spray gun connecting rods (323) are connected with and provided with a motor (324); and the motor (324) drives the spray guns (32) to move along the rotary mobile grooves (3030). The invention provides the electrolyte injection mechanism. The electrolyte absorption mode in the mechanism is rotary centrifugal injection; injection of the electrolyte is finished by twice; and the electrolyte absorption effect is good.

The invention relates to a high-pressure air-filled textile dryer. The high-pressure air-filled textile dryer comprises a rack, two supporting wheels and a hot air dryer. The rack comprises a base andtwo supporting frames, and the two supporting frames are arranged at the front and rear ends of the base respectively. Each supporting wheel comprises a fixing rotating shaft and a wheel body, wherein the fixing rotating shaft is fixedly connected to the corresponding supporting frame, one end of the fixing rotating shaft is provided with an air filling port, the upper side of the fixing rotatingshaft is provided with a row of air outlets communicating with the air filling port, and the middle of the wheel body is provided with a center hole sleeving the fixing rotating shaft so that the wheel body can be rotatably installed on the fixing rotating shaft. The hot air dryer is installed on the base and located between the two supporting wheels. The air filling ports are filled with high-pressure air, by pulling cloth, the wheel bodies can rotate to positions where a row of air blowing holes in each wheel body communicate with the row of air outlets in the corresponding fixing rotatingshaft, as the airflow is strong, the cloth can indirectly suspend over the surfaces of the wheel bodies, the probability of contact between the cloth and the wheel bodies is reduced, in other words, the probability that the surfaces of the wheel bodies are stained with unfixed dyes is reduced, and the cross color between different pieces of cloth is prevented.

The invention relates to an injection device of alkaline dry battery electrolyte. The injection device comprises a first operating platform (2) rotating synchronously with a mainframe main shaft (1), a second operating platform (2) and a middle rotating disc (4), and further comprises an injection mechanism (10), wherein the injection mechanism (10) comprises a first barrel (100), an injection rod (101) and a second barrel (102); the second barrel (102) is provided with a liquid channel (1020) for electrolyte to flow, a liquid inlet (1021) and a capillary opening (1022) formed in the outer wall of the second barrel (102); the injection device further comprises an air exhaust mechanism (11) which is arranged below the first barrel (100) and is communicated with a liquid cavity (10010). In the injection device, the absorption mode of electrolyte adopts absorption under negative pressure, namely the absorption environment of electrolyte is a negative-pressure environment, in the negative-pressure environment, the absorption effect of electrolyte is better, the time when electrolyte is exposed to the air is short, and electrolyte has low probability of deterioration.

The invention belongs to the technical field of torque limiters, and particularly relates to a torque limiter based on slide blocks and used for building electric drill equipment. The torque limiter comprises an input shaft, a drive shell, an output shaft, drive blades and steel balls. When an electric drill designed by the invention is used by people, the input shaft rotates and drives a drive circular ring to rotate; the drive circular ring rotates to drive the drive shell to rotate through four limit trigger blocks; the drive shell drives the output shaft to rotate; and then the electric drill can be normally used. When a drill bit on the electric drill reaches a high rotating speed during use of the electric drill, the torque on the drill bit needs to be smaller so as to prevent fracturing of the drill bit under the circumstance, that is, the torque on the output shaft of the torque limiter needs to be regulated to be smaller; when the rotating speed of the input shaft of the torque limiter designed by the invention reaches a certain limit, the drive circular ring is disengaged from the drive shell; the drive shell rotates under the effect of friction between the steel balls between the drive shell and a transmission shaft; and the torque of the output shaft can be reduced by regulating the steel balls.

The invention discloses a laser light source and a laser projection display device, which relate to the technical field of laser display and are used to reduce the degree of pollution of the heat-conducting silicone grease filled between a heat-conducting block and a laser heat sink, thereby ensuring a stable thermal conductivity of the heat-conducting silicone grease. The laser light source includes a heat conduction block, a heat pipe assembly, and a heat pipe fixing cover fastened together with the laser housing. The heat pipe fixation cover and the laser housing form an accommodation space, the heat pipe assembly and the heat conduction block are arranged in the accommodation space, and the heat pipe assembly is fixed A heat-conducting material is formed on the side of the heat pipe fixing cover contacting the accommodation space, and the surface of the heat-conducting block contacting the laser heat sink. The laser projection display device includes the laser light source mentioned in the above technical solution. The laser light source and the laser projection display device provided by the invention are used for laser display.

The invention relates to an alkaline dry battery electrolyte negative pressure rotary absorption device, which comprises a base (1), a column (2) fixed to the base, a top plate (3) fixedly arranged on the top of the column, and a support on the driving shaft (4). A cup rotating mechanism (6), the supporting cup rotating mechanism (6) is evenly distributed with a plurality of supporting cups (8) for installing the battery (7); it also includes a negative pressure absorbing structure (9) for making the battery (7) in The electrolyte solution is injected into the battery (7) under negative pressure; the number of spray guns (92) is 2, and the electrolyte solution is injected into the battery (7) in a centrifugal manner. The technical solution overcomes the problem of insufficient absorption of the electrolyte under normal pressure, combines the injection of the electrolyte and the negative pressure absorption process, and adopts rotational absorption, so that the absorption efficiency of the electrolyte is high.

The invention relates to a PCB copper electroplating groove, which comprises a groove body, two positive electrodes disposed on two sidewalls of the groove body and a kickboard rack which is arranged in the middle of the groove body and is used for disposing a PCB. One end of the groove body below the kickboard rack is provided with a water inlet. An installation groove for a screen filter is disposed near the kickboard rack between the kickboard rack and the two positive electrodes. The installation groove for the screen filter is provided with the screen filter. One end of the groove body between the screen filter and the two positive electrodes is provided with a water outlet externally connected with a filter. The screen filter concretely contains a fixed pedestal, a plurality of clamp poles vertically arranged on the fixed pedestal and a plurality of filters installed between the clamp poles, wherein the filter comprises a bracing frame, a handle arranged on the top of the bracing frame and filter cloth arranged on the side surface of the bracing frame; strip-shaped grooves are disposed on the side of the clamp poles; strip-shaped bosses are correspondingly arranged on the two sides of the filters; and the filters can be detachably installed on the clamp poles through the joint of the bosses and the grooves. According to the invention, copper ash and impurities in the copper grooves can be effectively minimized and the copper electroplating groove pollution can be prevented.

The invention provides an initial support device for a weak surrounding rock bias multi-arch tunnel. The initial support device for the weak surrounding rock bias multi-arch tunnel comprises a support mechanism, a water pump, an anchor rod and a filtering mechanism, wherein the filtering mechanism comprises a mounting pipe, a drainage pipe, a connecting plate, convex blocks, a filter screen, a pointed end and a fixing rod, the mounting pipe is mounted in the anchor rod, and the drainage pipe is slidably connected into the mounting pipe; the top end of the drainage pipe is rotationally connected with the connecting plate, and the convex blocks with arc-shaped side walls are mounted on the side wall of the connecting plate at equal intervals; the interior of the connecting plate is rotationally connected with the filter screen, and the filter screen is fixedly connected with the drainage pipe; the fixing rod is mounted on the side wall of the drainage pipe, and the fixing rod and the filter screen are rotationally connected into the pointed end; and the initial support device further comprises a connection mechanism and a rock layer. The initial support device for the weak surrounding rock bias multi-arch tunnel has the advantages that accumulated water in a rock stratum is effectively discharged, and the strength of the rock stratum is improved.

A full-automatic solution preparing and injecting device for polishing comprises a polishing solution bottle, a brushless water pump, a polishing solution stirring rotor, a liquid level sensor, a polishing solution stirring motor, an automatic feeding unit, a feeding motor, connecting screw rods, a storage bottle, a polishing powder stirring rotor, a polishing powder stirring motor, a power supply, a controller, an alternating current contactor and an electromagnetic water valve. The full-automatic solution preparing and injecting device can be used for automatically preparing and injecting a polishing solution for polishing, the reliance on operators during polishing is greatly reduced, the automation degree of polishing is improved, the problem that the operators must prepare the polishing solution on site regularly is solved, and the safety problem that the operators inevitably suck in polishing powder during the preparation of the polishing solution is also solved.

The invention relates to an electrolyte negative pressure absorbing device for an alkaline dry battery, comprising a base plate (1), a column (2) fixed to the base plate, a top plate (3) fixedly arranged on the top of the column, and a support cup provided on the drive shaft (4) Rotating mechanism (6), the supporting cup rotating mechanism (6) is evenly distributed with a plurality of supporting cups (8) for installing batteries (7) along the circumferential direction; it also includes a negative pressure absorbing structure (9), the negative pressure absorbing mechanism ( 9) It is used to inject the electrolyte solution into the battery (7) after the battery (7) is under a negative pressure state; it also includes a holding cup delivery mechanism (15), and the holding cup delivery mechanism (15) is used to place the holding cup (8) ) into the holder cup station. The problem of insufficient electrolyte absorption under normal pressure is overcome, and a device is provided, which combines electrolyte injection and absorption processes together, and has high electrolyte absorption efficiency.

The invention discloses a preliminary screening system for COD (chemical oxygen demand) automatic test. The preliminary screening system comprises an upper computer, a first injection pump mechanism,a spectrophotometer, a reagent bottle, a chloride ion selection electrode and a control module, wherein the spectrophotometer is used for testing the light absorption value; the reagent bottle is usedfor storing a preliminary screening reaction reagent; the chloride ion selection electrode is used for testing voltage information in a sample bottle and transmitting the voltage information to the control module; the control module is used for receiving a control instruction of the upper computer and performing the following operations of (1) sending a control signal to the first injection pumpmechanism; taking 0.5mL of samples; adding 5mL of potassium dichromate solution and 8mL of sulfuric acid for reaction; (2) testing the light absorption value at 440nm; (3) performing calculation to obtain the chlorine-containing COD of the sample; (4) calculating the chlorine ion concentration of the sample and the chlorine ion conversion COD; (5) calculating the sample COD and updating the resultto the upper computer. The preliminary screening system belongs to an automatic system for performing fast screening on the COD of the chlorine-containing wastewater.