42results about How to "Good for cleaning" patented technology

The invention relates to compositions and methods for cleaning typically organic beverage and food soils. The cleaning composition is formulated to remove carbohydrate and proteinaceous soils from hard surfaces. The formulations of the invention are directed to remove carbohydrate and proteinaceous soils from beverage manufacturing locations such as soils arising in the manufacture of malt beverages, fruit juices, dairy products, etc.

An oral brush is provided that includes an elongated body, a head portion extending from the body, and a plurality of bristles, formed of particular thermoplastic elastomers, extending from the body. In various embodiments, the thermoplastic elastomer has a Shore A hardness of at least 30; the thermoplastic elastomer is selected from the group consisting of polyetheramides, polyesters, styrene-ethylene-butylene-styrene block copolymers, polyurethanes, polyolefin elastomers, and mixtures thereof; and the thermoplastic elastomer has a flexural modulus of at least 5 MPa.

Vibration dampening elements that are made of rubber and/or an elastomer may fail when subjected to vertical and/or horizontal stresses caused by repeated lifting of the cleaning head assembly and/or unintentional bumping of the cleaning head assembly into door frames, walls or other non-movable objects. The present invention includes, among other things, at least one stabilizer element and preferably two stabilizer elements to reduce damage to certain vibration dampening elements caused by vertical and/or horizontal stress. Alternative embodiments of the stabilizer element are also disclosed.

A compact vacuum cleaning device for automatic cleaning of smooth and textile floor coverings, particularly in the private home sector, has a housing, a suction mouth on the underside of the housing, a cleaning roller disposed in a roller chamber, a dust collection container, a suction fan, an electrical travel drive, control electronics, and a power source. The device height of the vacuum cleaning device is less than 180 mm. The maximal suction air stream that enters through the suction mouth, passes through the dust collection container, and leaves the vacuum cleaning device through the suction fan, is greater than 15 l/s. The maximal suction power is greater than 10 W.

The present invention is a reliable method of electroless-plating integrated circuit die that achieves high yield. Die are attached to a holder using a polyimide adhesive to eliminate voltage differences on bond pads which would otherwise interfere with the plating. The die are aggressively cleaned using multiple cleaning solutions, one heated to a user-defined temperature. Each cleaning is followed by an aggressive rinse in de-ionized water. Die are immersed into multiple metal solutions at user-definable temperatures. Each immersion is followed by an aggressive rinse in de-ionized water, one with heated de-ionized water.

The invention discloses a barrel washer. The barrel washer comprises water tanks, a cleaning motor, a cleaning rotating shaft, a cleaning brush, an empty barrel rotating motor and an empty barrel rotating shaft; the water tanks are located above and below an empty barrel which is cleaned; the cleaning motor is connected with the cleaning rotating shaft; the cleaning brush is arranged on the outer surface of the cleaning rotating shaft; the cleaning brush is in contact with the outer wall of the empty barrel; the empty barrel rotating motor is connected with the empty barrel rotating shaft; the empty barrel rotating shaft is connected with the empty barrel. The barrel washer is firm, durable, easy to operate, high in cleaning efficiency and good in cleaning effect.

The invention discloses a polishing device with an air filtering function. The polishing device comprises a polishing box body. A collection box is arranged at the bottom of the polishing box body. A clamping device body and a filtering device body are arranged at the top of the collection box. A polisher is arranged at the top of the filtering device body. A supporting plate is arranged at the bottom of the clamping device body. A hydraulic device body is arranged at the bottom of the supporting plate. The clamping device body comprises a U-shaped plate. Positioning bolts are arranged in both screw holes in the two sides of the U-shaped plate. A positioning block is arranged at the end, located on the inner side of the U-shaped plate, of each positioning bolt. According to the polishing device with the air filtering function, dust generated in the polishing process can be effectively filtered and can be effectively prevented from damaging the health of operating personnel; cleaning of a production workshop is facilitated; the situation that the environment is polluted due to the fact that the dust floats to the atmosphere is avoided; scraps generated in the polishing process can be recycled; the sweeping and cleaning work load of the production workshop is reduced; and the work of the operating personnel is convenient.

The invention provides a floor brush assembly and a vertical cleaning machine with the same. The floor brush assembly comprises a floor brush base, and a driving motor is arranged at the front end ofthe floor brush base; the driving motor is connected with a rolling brush assembly; a clean water outlet pipeline and a sewage recovery system are also formed on the floor brush base; the sewage recovery system comprises a sewage tank; a sewage tank cover is arranged at the upper end of the sewage tank, the front end of the sewage tank cover inclines towards the middle to form a slope surface, therear side of the sewage tank cover horizontally extends towards the middle to form a horizontal plane, vertical wall surfaces are formed between the slope surfaces on the two sides and the horizontalplane respectively, a sewage inlet is formed in the middle, and drainage angles alpha are formed between the vertical wall surfaces and the sewage inlet respectively. The clean water outlet pipelinecomprises a water storage chamber defined by a floor brush water outlet upper cover plate and a floor brush water outlet lower cover plate, and the water storage chamber is communicated with a water pump. The floor brush assembly is uniform in water outlet, sewage backflow is effectively prevented, secondary pollution is avoided, and user experience is good.

A device for measuring the magnetization of a soft ferrite pre-sintering material is provided. The device comprises a weighing mechanism, a bracket above the weighing mechanism, and a support on the top of the bracket, wherein the support is provided with a permanent magnet, the weighing mechanism connected with the inside of the bracket is provided with a container for holding a ferrite pre-sintering material. The bracket, the support and the container are all non-magnetic structures. The device indirectly measures the amount of spinel by measuring a magnetization angle, is high in measurement accuracy of magnetization, simple, reasonable, easy to process and manufacture, and convenient to operate. Components in the device are common in laboratories and low in cost so as to reduce research and development and production cost, help to improve production efficiency, and help to ensure high product quality.

The invention relates to a milk foaming steam pipe which comprises an inner pipe internally provided with a steam channel. The milk foaming steam pipe is characterized by further comprising an outer pipe, a steam nozzle and a spray head, the outer pipe sleeves the inner pipe, an air channel is formed between the periphery wall of the inner pipe and the inner hole wall of the outer pipe, and the air channel and the steam channel are independent of each other; the steam nozzle is internally provided with a transition steam channel and a transition air channel which are independent of each other,a steam inlet end of the steam nozzle is insertedly connected to a steam outlet end of the inner pipe, and the upper portion of the steam nozzle is in threaded connection with the tail end in the outer pipe; the spray head is internally provided with a through hole, and an outlet end of the through hole is shaped like necking, the lower portion of the steam nozzle stretches into the through holeand is in threaded connection with the interior of the through hole of the spray head, and a negative pressure cavity is formed in the spray head below the steam nozzle. According to the steam pipe, it can be guaranteed that adequate air is mixed with the steam without complex operation, tiny air particles are directly formed to be put into milk to form milk foams, milk cannot be left in the innerchannel of the steam pipe basically, and use is more sanitary and healthier.

The invention discloses an automatic cooker. The automatic cooker comprises a main machine body, a frying pan, a feeding mechanism, a stirring mechanism and a seasoning mechanism, wherein an inner cooking cavity is formed in the main machine body, the frying pan comprises an upper pan and a lower pan, the upper pan and the lower pan are each of an arc-shaped columnar structure, the upper pan and the lower pan are of a cylinder structure after being spliced, the front side face of the main machine body is provided with a first opening which penetrates into the inner cooking cavity and is matched with the lower pan, the top face of the main machine body is provided with a second opening which penetrates into the inner cooking cavity and is matched with the upper pan, the arc-shaped top face of the upper pan is provided with a food inlet used for putting food materials into the lower pan, and the feeding mechanism, the stirring mechanism and the seasoning mechanism are all carried on the main machine body and are respectively used for feeding food materials, stir-frying the food materials and putting seasoning supplies. According to the automatic cooker, full-automatic food material and seasoning feeding and food material stir-frying can be achieved, the automatic cooker is more intelligent, dish discharging and stir-frying pan cleaning are facilitated, in-pan direct spraying of seasoning can be achieved, and the automatic cooker is more efficient.

The invention relates to a novel livestock and poultry multi-story building ventilation system. The ventilation system is arranged in a livestock and poultry building; the livestock and poultry building is communicated with an air shaft; an exhaust fan is arranged on a wall body of the air shaft in a concentrated mode; a summer ventilation system comprises a summer ventilation pipe; the summer ventilation pipe is arranged above a feeding layer; multiple summer air outlet pipes with different angles are distributed at the bottom of the summer ventilation pipe; a winter ventilation system comprises a winter ventilation pipe; the winter ventilation pipe comprises a preheating section and an air outlet section; the preheating section is arranged in a preheating air duct; one end of the preheating section is communicated with the bottom end of an air chamber through an adjustable winter air inlet; the other end of the preheating section is connected with the air outlet section through a connecting section; the air outlet section is also arranged above the feeding layer; and multiple air outlet pipes with the length directly reaching the downstream of the feeding layer are distributed at the bottom of the air outlet section. The summer air outlet pipes blow air to the pig body in three directions, so that the optimal air speed, air volume and air blowing position can be provided for the pig. The winter air outlet pipes are conveyed to the ground position, hot vitiated air is squeezed out of a ceiling from the bottom, and an air outlet can be adjusted, so that the optimal air volume can be provided.

The invention discloses a mop dehydration device which comprises a motor (20), a support base (15), a connecting support (10), a round table (9), a mop rod clamping device, a mop head clamping device and a mop head clamp driving device, wherein the mop head clamp driving device comprises a pressing block (8), a pressing lever (5), a ratchet wheel (7) and a pawl (4); the pressing block (8) is connected with the mop head clamping device in a sliding manner in the vertical direction and buckled with the mop head clamping device in the horizontal direction; one end of the pressing lever (5) is compressed to the upper end surface of the pressing block (8); the ratchet wheel (7) is fixedly connected onto a pin shaft (6); one end of the pawl (4) is hinged to a vertical column (28), and the other end of the pawl (4) is buckled with the ratchet wheel (7). Through adoption of the mop dehydration device, the operation noise is reduced greatly, and the mop can be better to be wrung out, so as to be more conducive to floor cleaning; in addition, the mop head clamping device is simple in structure and convenient to operate.

The invention relates to an environment-friendly fuel hose. The fuel hose comprises a hose body, wherein the hose body comprises an inner lining layer, a reinforcing layer and an outer covering layerwhich are sequentially arranged from inside to outside, and the inner side surface of the inner lining layer is provided with a blocking layer which is used for isolating fuel oil and the inner lininglayer so as to prevent the fuel oil from extracting soluble substances from the inner lining layer. According to the fuel hose, through the arrangement of the blocking layer, direct contact between the inner lining layer and the fuel oil is avoided, so that the oil can be prevented from extracting the soluble substances from the rubber layer of the hose, and the problem of fuel pollution from thehose in a fuel conveying process is solved. A manufacturing method of the environment-friendly fuel hose is further related. The method comprises the following steps of preparing adhesive tape of theinner lining layer and the outer covering layer; sequentially extruding the blocking layer and the inner lining layer, weaving or winding the reinforcing layer and extruding the outer covering layer;and vulcanizing. The method is simple and convenient to operate, and the manufactured environment-friendly fuel hose is compact in structure and stable in performance.

The invention discloses a saccharomycete production and processing device convenient to clean, belongs to the technical field of saccharomycete processing, and solves the problem that bacteria are easily bred on the inner wall of a tank body because the tank body of the existing device is inconvenient to clean. The device is technically characterized by comprising the tank body, wherein a drivingassembly is arranged at the top of the tank body, a plurality of cleaning mechanisms used for cleaning the side wall of the tank body are arranged in the middle of the tank body, a lifting ring is arranged at the bottom of the tank body, a cleaning ring is arranged on the exterior of the lifting ring in a sleeving manner, a plurality of scraping assemblies are uniformly distributed on the cleaningring, and the cleaning ring and the cleaning mechanism sare fixedly connected with the driving assembly respectively. According to the embodiment of the invention, the cleaning mechanisms are arranged, the cleaning mechanisms not only can play a role in cleaning dirt on the side wall of the tank body, but also can play a role in increasing the contact area of cleaning liquid and the side wall ofthe tank body, cleaning of the side wall is facilitated, meanwhile, a linkage type driving mode is adopted for operation, and therefore, the device is energy-saving, environmentally friendly and convenient to control.

The invention discloses a dispensing machine for silica gel gasket producing. According to the dispensing machine, supporting legs are arranged at the lower end of the base, transverse plates are welded to the lower end surface of the base, springs are arranged at the lower end of the transverse plates, bottom plates are arranged at the lower end of the springs, a supporting plate is arranged on the upper end surface of the base, a liquid storage tank is arranged at the upper end of the supporting plate, liquid inlet pipes are arranged on the two sides of the liquid storage tank, a transversepipe is arranged at the lower end of the liquid inlet pipes, branch pipes are arranged at the lower end of the transverse pipe, dispensing nozzles are arranged at the lower end of the branch pipes, anair pressure cylinder is arranged on the upper end surface of the base, a lifting column is arranged at the upper end of the air pressure cylinder, a workbench is arranged at the upper end of the lifting column, a round hole is formed in the end surface of the workbench, the lifting column is arranged in the round hole, hollow grooves are arranged in the end surface of the workbench, fixing grooves are arranged in the lower end of the hollow grooves, a left limiting block and a right limiting block are arranged in the hollow grooves, a through hole is arranged in the left limiting block, a threaded hole is arranged in the right limiting block, a screw rod penetrates through the left limiting block through the through hole, the right end of the screw rod is arranged in the threaded hole, anut is arranged on the outer side of the left limiting block, and the nut is connected with the screw rod through threads.

The invention discloses an eye administration flushing device with an eyelid opening function. The eye administration flushing device comprises a head support assembly, an eyelid support assembly andan administration flushing assembly, and is characterized in that the head support assembly comprises a bottom plate and a support vertical plate; the support vertical plate is arranged on the bottomplate; a telescopic adjusting rod and a first threaded rod are arranged on the support vertical plate; the eyelid supporting assembly comprises a supporting frame, a connecting frame and a supportingroller; a connecting block and a threaded block are arranged on the supporting frame; a sliding rod and a second threaded rod are arranged on the connecting frame; the sliding rod is connected with the connecting block; the second threaded rod is connected with the threaded block; the supporting frame is clamped with the first threaded rod, and the supporting roller is arranged on an arc-shaped plate; the administration flushing assembly comprises a waste liquid collecting cover, a flushing spray head, an adjusting plate and a movable sliding block; the movable sliding block is clamped to thesupporting vertical plate; the adjusting plate is connected with the movable sliding block in an inserted mode; and the waste liquid collecting cover and the flushing spray head are connected with theadjusting plate, so that the device is reasonable in structural design, convenient to adjust and suitable for large-scale popularization.

The invention provides a method for removing surface pollution of a polished silicon wafer with a normal-temperature HF acid. The method comprises the steps of additionally arranging two grooves, namely a liquid groove and a pure water groove, in front of a standard cleaning machine table; weighing 49-51% of hydrofluoric acid solution according to a proportion of 0.8-1.2% of volume of the liquid groove; weighing a surfactant according to a proportion of 0.1-0.2% of the volume of the liquid groove; adding the weighed hydrofluoric acid solution and the weighed surfactant into the liquid groove,and performing full mixing; placing the silicon wafer in the liquid groove, and cleaning the silicon wafer under a normal temperature; placing the cleaned silicon wafer in the pure water groove, and cleaning the silicon wafer with pure water under the normal temperature; and placing the cleaned silicon wafer in the standard cleaning machine for cleaning. The surface pollution of the polished silicon wafer is removed by the normal-temperature HF acid, so that the surface cleanliness is greatly improved, and the demands of different clients are satisfied.

The invention relates to an intelligent handrail which comprises an outer frame, a scraping unit, a scrubbing unit, a wiping unit and a wipe dry unit, the scraping unit is installed at the lower end of the outer frame, the scrubbing unit is arranged in the middle of the outer frame, the wipe dry unit is arranged at the upper end of the outer frame, the wiping unit is arranged in the outer frame, and the wiping unit is located between the scrubbing unit and the wipe dry unit. The intelligent handrail can solve the problems that a large number of passengers are transported by an escalator everyday, the surface of a hand strap often carries a large number of bacteria, and particularly, a large number of dust is accumulated on an escalator or a sidewalk located outdoors, so that the service life of the hand strap can be influenced, the riding experience and mood of the passengers can be influenced, a traditional hand strap is generally wiped and cleaned manually, time and labor are wastedin the manner, cleaning personnel can block an entrance and an exit of the escalator during wiping, and normal use of the escalator or the moving sidewalk by the passengers is influenced.

The disclosure relates to a method of cleaning a process chamber of a capacitively coupled plasma reactor, the method comprising: a) Introducing a gas comprising 80-100% in volume of inert gas into the process chamber, wherein said inert gas is selected from the group consisting of neon, argon, krypton, xenon and combinations thereof; and b) Forming a plasma from said inert gas, thereby cleaning said process chamber.

The invention relates to a stirring paddle used for paraffin production stirring equipment, which belongs to the paraffin processing equipment field. The invention provides the stirring paddle used for the paraffin production stirring equipment, and comprises a spindle sleeve and at least four blades fixed on the circumference outside the spindle sleeve; each blade comprises a hollow blade body and a corrosion resisting layer covering the outer surface of the blade body, and a heating net is filled in the inner cavity of the blade bodies. A heating device is arranged in the blades, so that the problem that the reactant viscosity is increased, the reaction rate of the material at the lower part is decreased; and the heating device is in favor of blade cleaning.

The invention discloses a neurosurgical nursing wound cleaning device which comprises a device body, a stirring mechanism is arranged in the device body, the stirring mechanism comprises a second bevel gear, spiral blades, stirring rods and a stirring shaft, and a second bevel gear is fixedly connected on the top end of the device body, a rotating shaft is fixedly arranged on the second bevel gear, the stirring rods are symmetrically arranged on the two sides of the rotating shaft, the two stirring shafts are connected with the rotating shaft through connecting rods, and second bearings are arranged at the joints of the connecting rods and the stirring shafts. The solid drug and liquid drug are fed into the device body from the feeding port, the bidirectional motor rotates to drive the transmission shaft to rotate, the transmission shaft rotates to drive the first blowing gear to rotate, the first bevel gear rotates to drive the second bevel gear to rotate so as to drive the rotating shaft to rotate, the rotating shaft rotates to drive the spiral blades to rotate, and under the action of the connecting rods and the second bearings, the rotating shaft rotates to drive the stirring rods to rotate.

The device assists the customer in cleaning residue from their skin and body hair after they use a toilet for elimination, after they receive a cut or abrasion, or from other source. With the device, the person physically transforms toilet paper and other tissue-like paper in real time to have greater texture, density, and wetness, all three of which together facilitate cleaning better than dry paper or than wet paper without such increased density and texture. Being pocket sized and intended for repeated use, the device can be easily carried by or on the person and used in any bathroom or location anywhere without modification to the plumbing facilities, without risk of running out of a supply of pre-moistened wipes, and without damaging the environment or sewage and septic systems.

The invention discloses an intelligent self-service car washing system, and belongs to the field of car washing, the intelligent self-service car washing system comprises a car washing body, a processor is arranged in the car washing body, a code scanning area is arranged on the car washing body, and the code scanning area is in communication connection with a processor; a pre-storage water tank is arranged in the car washing body, a water spraying pipe is arranged on the pre-storage water tank, a water spraying gun is arranged at the outlet end of the water spraying pipe, the processor is in communication connection with the water spraying pipe, and a water flow controller is arranged on the water spraying pipe, comprises a pressure pump and an electric control valve and is electrically connected with the output end of the processor; a display screen is arranged in the car washing body and is in communication connection with the processor. The code scanning area is used for an automobile user to scan codes through the code scanning area, the flow speed of the water spraying pipe can be adjusted, different charging prices can be conveniently formulated for automobile washing in different areas, manual use is reduced, manual output is saved, automobile washing is facilitated, and the device is convenient to use.

The invention provides a folding type snow sweeper which comprises an aluminum alloy framework, a wheeled support, bolts located in the connecting position of the aluminum alloy framework and the wheeled support and achieving a connecting effect, an LED lamp fixed to the aluminum alloy framework, and a chassis located at the bottom of the aluminum alloy framework and connected through a movable shaft. The upper portion of the chassis is provided with an interface connected with a wire, a motor is arranged in the chassis, a disc type sweeping wheel is additionally arranged at the bottom of themotor, and a detachable guide board is arranged on the side face of the chassis. A main working mode is simple, the motor is directly controlled by a switch to rotate so as to drive the disc type sweeping wheel to work, compared with other metal frameworks, the aluminum alloy framework is firm in structure, light in weight and convenient to use in the working process, the snow sweeper can be usedat night or in the morning due to the arrangement of the LED lamp, the snow sweeper can be folded to be stored after being used, and the occupied area is small. The disc type sweeping wheel is betterin sweeping effect, accumulated snow is unlikely to adhere, and the disc type sweeping wheel is suitable for sweeping a rugged road surface or a narrow road surface.

The invention relates to the field of machining, and discloses a clamping device. The clamping device comprises an upper sucker, a lower sucker and a sucker valve body, wherein the upper sucker is opposite to the lower sucker, the sucker valve body is arranged on the end face of one side of the lower sucker, the upper sucker is provided with a positioning structure used for positioning a workpiece, and the positioning structure is deformable. The invention also discloses a clamping method. According to the clamping device, the problem that a thin-wall piece is easy to deform due to clamping iseffectively solved.

The invention provides a cooking utensil. A cavity bottom plate and a rotation disc body are included. The cavity bottom plate is provided with a downwards-concave concave part. The rotation disc bodyis arranged in the concave part, the upper surface of a carrying part in the rotation disc body is flush to the upper surface of the cavity bottom plate, a plurality of rolling bodies for supportingrotation of the rotation disc body are arranged in the concave part, and accordingly rotation and/or supporting of the rotation disc body are/is achieved through the multiple rolling bodies. Through the technical scheme, the cooking utensil integrally sinks, the bottom face of a cavity and a rotation disc are flatter, transition is smooth, cleaning is convenient, the cooking utensil can rotate under supporting of the multiple rolling bodies, and uniformity during food heating can be better.

The invention relates to an inclined workpiece table grinding machine, and belongs to the field of machine manufacturing, in particular to a grinding machine capable of being used for machining handicrafts (such as ashtrays). According to the technical scheme, a workpiece table which is inclined or perpendicular to the horizontal plane is adopted, and the workpiece table is provided with a partition plate and a flow guide opening, so that the defects that existing equipment is low in machining precision and polishing standard are overcome; the polishing machine has the beneficial effects that due to the fact that the workpiece table which is inclined or perpendicular to the horizontal plane is adopted, cleaning of grinding residues is facilitated, the influence of the residues is avoided, the machining precision and the polishing standard are improved, the workpiece table is provided with the partition plate and the flow guide opening, the residues and cleaning sewage are conveniently collected in a centralized mode, and environmental protection is facilitated.

The invention discloses a dust removal device for processing a decoration panel. The dust removal device comprises a support frame, a machine shell is fixed at the top end of the support frame, an inlet plate opening is formed in the front side of the machine shell, a plate outlet is formed in the back side of the machine shell, a first motor and a second motor are arranged at the right end of themachine shell, motor shafts of the first motor and the second motor penetrate through the interior of the machine shell, the motor shafts of the first motor and the motor shaft of the second motor are provided with soft brushes, the two sides of the inner part of the plate inlet and the plate outlet are respectively provided with sliding shells, the sliding shells are in a U shape, a motor is arranged at one end of the outer wall of the sliding shell, the rotating shaft of the motor penetrates through the U-shaped grooves of the sliding shells, and rotating rollers are arranged in the U-shaped groove of the sliding shell. According to the dust removal device, the motor shafts of the first motor and the second motor are respectively provided with the soft brushes, after the panel enters the machine shell, the two ends of the opposite plate are cleaned by the soft brushes, dust and impurities are separated, the processing quality of the rear-sequence panel is greatly improved, and the method is suitable for being widely popularized and used.

The invention relates to a Mini/microLED bonding pad intelligent cleaning device which comprises a mounting plate, a cleaning assembly, an injection valve and a vibration assembly, the cleaning assembly is mounted on the front end face of the mounting plate and used for cleaning residues on a bonding pad, the injection valve is mounted on the left side of the front end of the mounting plate, and the vibration assembly is mounted on the lower side of the front end face of the mounting plate and used for cleaning residues on the bonding pad. The front end of the mounting plate drives the cleaning assembly to perform vibration cleaning on the bonding pad. The device can solve the problems that when an existing device cleans a bonding pad, many solder paste residues often exist on the bonding pad, the residues on the bonding pad cannot be effectively and accurately cleaned, the follow-up installation effect of an LED is affected, and meanwhile when the existing device cleans the bonding pad, the residues cannot be effectively and accurately collected, and the service life of the LED is prolonged. And the residues are easy to fall again, so that secondary pollution of the residues is caused, and subsequent installation of the LED is not facilitated.