55results about How to "Good anti-rat effect" patented technology

The invention discloses a reinforced type all-dielectric and rodent-resistant cable and a manufacturing process of the reinforced type all-dielectric and rodent-resistant cable, and relates to the technical field of communication cables. The reinforced type all-dielectric and rodent-resistant cable comprises multiple optical fibers, fiber paste, a loose casing pipe, a center reinforcement piece, a cable core water-resistant compound, an inner sheath, multiple rod-shaped FRPs 7 and an outer sheath, wherein the multiple rod-shaped FRPs 7 are arranged between the inner sheath and the outer sheath; the multiple optical fibers are arranged inside the inner sheath; the loose casing pipe is arranged outside the optical fibers; the position between the optical fibers and the loose casing pipe is filled with the fiber paste; the position between the loose casing pipe and the inner sheath is filled with the cable core water-resistant compound; the center reinforcement piece is arranged in the center of the optical fibers. According to the reinforced type all-dielectric and rodent-resistant cable and the manufacturing process of the reinforced type all-dielectric and rodent-resistant cable, the weight of FRP sheathed rodent-resistant cables is reduced greatly, the difficulty of laying construction is not added under the condition that the cables have the good rodent-resistant effect, and the solution is provided for optical communications at areas with serious damage caused by rodents, such as mountainous areas and sewer lines of cities.

The invention relates to a granary automatically exhausting air regularly. At present, a multi-function grain storage granary which can prevent insects, rats and mildew, stores grain and can eliminate and reduce grain waste is lacked. The granary comprises bases (1), a granary body (2) is arranged on the bases, a set of air exhaust columns (3) is arranged in the granary body, a main air exhaust air barrel (5) is arranged at the top of the granary body, an umbrella cap (6) is arranged above the main air exhaust air barrel, an air exhaust fan (9) is connected below the main air exhaust air barrel, a timing controller (10) is connected with the air exhaust fan, a grain inlet (7) is formed in the upper portion of the granary body, and a grain discharge port (8) is formed in the lower portion of the granary body. The granary is used for storing the grain, can automatically carry out air blast regularly, and keeps the grain dry.

A cable (1) in particular for use in a concentrated solar power installation is provided, is provided with a core (2) for transmitting signals and / or power, an inner jacket (3) enclosing the core, an outer jacket (4) enclosing the inner jacket, and a shield (5) disposed between the inner and outer jackets. The shield is configured as a flexible conduit. A concentrated solar power installation comprising the cable is also provided.

The invention belongs to the field of a cable material, and particularly relates to a rat-proof polyvinyl chloride (PVC) cable material. The rat-proof PVC cable material is prepared from the following raw materials in parts by weight: 100 parts of PVC resin, 6-10 parts of an impact modifier, 40-45 parts of a plasticizer, 0.1-0.5 parts of an antioxidant, 0.1-0.5 parts of a lubricating agent, 5-8 parts of a heat stabilizer, 20-30 parts of a filler, 15-20 parts of a fire retardant and 2-3 parts of raticide. The PVC cable material provided by the invention has excellent mechanical and physical properties, and can meet the rat requirements of the cable, and the protection rate can be up to over 99.5%.

The invention discloses a manufacturing method for an interlocked armored aluminum alloy flat cable. According to the manufacturing technology, the manufacturing method comprises the following steps in sequence: drawing wires, stranding a conductor, annealing the conductor, extruding an insulating layer, extruding a lining layer, and pressing an interlocked armored layer, wherein the conductor annealing step comprises the steps: through boxcar type heating and annealing steps, heating the stranded conductor to 370-400 DEG C, lasting for 4-5 hours at the environment of 370-400 DEG C, and then naturally cooling to the room temperature; and the interlocked armored layer pressing step is that an aluminum alloy tape with the thickness of 0.5mm-0.6mm is arranged on the surface of the lining layer and pressed into a Z-shaped interlocked armored form with the arc-shaped height of 2mm-4mm according to pitches of 6mm-24mm. according to the manufacturing method, the conductivity property and creep property can be improved, the service life of the cable can be effectively prolonged, the system can have good radiating effect in short time under overload state, and can be ensured to run safely.

The invention discloses an anti-rat-type PVC cable material and a preparation method. The material is prepared by the following raw materials by weight: 75 to 95 of XS-2-type PVC, 20 to 30 of metallocene linear low-density PE, 5 to 10 of MBS, 10 to 20 of antimony trioxide , 8 to 12 of brucite powder, 20 to 30 of carbon block N330, 2 to 3 of a calcium zinc composite stabilizer, 0.5 to 1 of stearic acid, 2 to 3 of sulphur, 3 to 5 of zinc oxide, 10 to 15 of nano wollastonite powder, 12 to 18 of epoxidized soybean oil, 10 to 15 of chlorinated paraffin, 8 to 12 of dioctyl sebacate, 5 to 10 of diisodecyl phthalate, 2 to 3 of an anti-rat agent M-17, and 5 to 10 of composite filler. According to the cable material of the invention, excellent anti-rat performance is provided, fire accidents and economic loss caused by rat bite can be effectively prevented, the material is environmental-friendly and safe, the physical and mechanical performance is more reliable, good flame retardant performance is provided, and better low-smoke and low-toxic properties are provided.

The invention discloses a rat-proof optical cable capable of being recognized easily, and a production technology and die for an optical cable, and belongs to the technical field of optical cables. The invention aims at solving problems that a conventional optical cable is poor in rat-proof performance, and a mark of the optical cable is worn after long-time use, and cannot be recognized. The exterior of a cable core of the optical cable is sequentially provided with a longitudinal coating steel belt, a polyethylene sheath, and a nylon sheath, wherein the exterior of the nylon sheath is provided with a recognition projection. The polyethylene sheath and the nylon sheath employ a double-head sheath production device, and there is a grafting agent in the material of the polyethylene sheath.The optical cable is small in size, is light in weight, is simple and convenient for reconstruction, is easy to recognized and is high in rat-proof performance.

The invention provides a woven bag flat filament which comprises mixed waste materials of PP (polypropylene) and PE (polyethylene) or PVC (polyvinyl chloride) and master batches. The master batches comprise carrier resins, fillers, dispersing agents, lubricating agents, coupling agents, toughening agents and rat-proof agents, and the rat-proof agents are mixture of capsaicin, camphor extracts andargy wormwood leaf extracts and loaded into kaolin and lignin which serve as filler components. The invention further provides a method for preparing the woven bag flat filament. The method includes the steps: master batch preparation; waste plastic treatment; batching mixing; extrusion molding; cooling; shredding; heating forming; winding. A preparation method of the master batches includes the step: loading the rat-proof agents into the kaolin and chitosan. According to the prepared woven bag flat filament, waste plastics are effectively utilized, environmental protection is facilitated, andthe prepared flat filament has good mechanical properties and rat-proof effects.

The invention discloses a cable with ratproof function, which is characterized in that a longitudinally-wrapped embossing steel band structure layer and an external polymer-material protective layer are arranged outside a cable core, and a structure layer comprising at least one wrapped steel wire is adjacently arranged outside the longitudinally-wrapped embossing steel band structure layer. Test results show that the cable in such a structure not only has the advantage of rodent resistance, but also has the function of preventing the damages caused by rats.

The invention discloses a ratproof data cable. The ratproof data cable comprises a cable inner core, a fireproof layer and an insulating layer which are arranged from inside to outside in sequence, wherein the cable inner core comprises a foaming framework and a conductor core group; the foaming framework comprises four limiting convex strips; the conductor core group is mounted in a mounting cavity; the conductor core group comprises a pair of wires which are arranged side by side; the exterior of the pair of wires is coated with an insulating layer; the outline of the cross section of the insulating layer adopts a regular hexagon shape; the edge of the insulating layer is sprayed with a ratproof coating film; the formula of the ratproof coating film comprises capsicin; adhesion layers are arranged on all the six outer side faces of the insulating layer. By virtue of the cable inner core, the fireproof layer, the regular hexagonal insulating layer, and the ratproof coating film which is arranged on the edge of the insulating layer, the ratproof data cable has a good ratproof effect, low dosage of rodenticide, and low pollution to the environment; and meanwhile, the shortcomings of relatively high weight and high cost of the existing data cable which is armoured with metal on the surface for preventing rodents from biting the cable are solved.

The invention provides a waste plastic woven bag ribbon-like filament which comprises raw materials including a PP (polypropylene) and PE (polyethylene) mixed waste material and a master batch, wherein the master batch comprises a carrier resin, packing, a dispersant, a moistening agent, a coupling agent, a toughening agent and a ratproof agent; the ratproof agent is a mixture of ratproof, a camphor extract and a folium artemisiae argyi extract and is supported in folium artemisiae argyi and chitosan as packing components. The invention further provides a method for preparing the woven bag ribbon-like filament from waste plastic. The method comprises the following steps: preparing the master batch, treating the waste plastic, mixing blending materials, performing extrusion molding, cooling, shredding, performing heating molding, and coiling, wherein the step of preparing the master batch comprises a step of supporting the ratproof agent in bentonite and chitosan. As waste plastic is effectively utilized, the waste plastic woven bag ribbon-like filament provided by the invention is beneficial to environmental protection, and is good in mechanical property and ratproof effect.

The invention belongs to the field of optical cables, and particularly relates to a rat-bite-proof butterfly-shaped optical cable. The cable comprises a sheath and a core cable. The sheath wraps and fixes the core cable, and an outer surface of the sheath is provided with a high-viscosity glue layer. The high-viscosity glue layer is formed by a high-viscosity glue, and the high-viscosity glue is an organic adhesive system containing synthetic capsaicin; and the high-viscosity glue layer is coated with anti-aging leather. The rat-bite-proof butterfly-shaped optical cable has a good rat-bite-proof effect; the rat-bite-proof effect lasts for a long time, and a service life is long; and the optical cable is environment-friendly, non-toxic and harmless.

The invention relates to the technical field of rodent-proof devices, in particular to a rodent-proof wire collar. The present invention adopts the following technical scheme: a rodent-proof electric wire collar, including a body, the body is a hollow cylindrical shape, two circular through holes are arranged on both sides of the body, and an annular protrusion is arranged on the circular through hole. An opening slit is arranged on the body and the annular protrusion, and the opening slit extends from the side of the body to the inner circle of the annular protrusion. The invention has a simple structure, can effectively prevent mice from entering the home by climbing electric wires, and has better effect of preventing mice.

The invention relates to the technical field of rat control, and particularly relates to a rat-proof system used for a power distribution cable and a laying method thereof. The structure of the rat-proof system comprises an electric well and a power distribution room which is connected with the electric well. The electric well comprises a filler which is arranged in the internal cavity of the electric well and used for wrapping and burying a cable, a through hole which is arranged on the wall surface of the electric well and used for penetrating of the cable and steel wire bodies which fill the through hole and are used for plugging the gap between the cable and the wall of the through hole. The through hole is also communicated with an electric wire slot. The electric wire slot is provided with iron wire cotton in a filling way and is communicated to the power distribution room. A smooth rat baffle is inserted on the door of the power distribution room. According to the rat-proof system, the gap positions are comprehensively filled so that the rats can be intercepted from entering the power distribution cable, the rats can be effectively prevented from damaging the cable and thus safe power utilization of the power distribution cable can be guaranteed. The laying method of the rat-proof system comprises the steps of cable lead-in, cable wrapping and burying, steel wire body filling, iron wire cotton filling and inserting of the rat baffle. The laying method has the advantages of being convenient and easy so as to enhance the rat-proof efficiency.

The invention relates to communication optical fiber cable techniques, and in particular relates to a mobile base station ratproof radio-frquency remote optical fiber cable capable of conducting thunder and lightning. The optical fiber cable comprises a cable core and an outer protecting sleeve, wherein the cable core consists of a tight sleeve layer, a subunit reinforcing component and a subunit sheath which are wrapped outside optical fibers in sequence; a plurality of cable cores are twisted with reinforcing pieces and are wrapped with an inner sheath; the inner sheath is sequentially wrapped with a steel strip and the outer protecting sleeve; adhesion force of the steel strip and the outer protecting sleeve can meet a torsion experiment that the optical fiber cable is twisted for 180 degrees for 10 times forward and backward. Due to adoption of an optical-fiber tight sleeve structure, the outer protecting sleeve as an outer protecting layer, and novel structural design and process control, not only is ordinary wireless radio-frequency remote optical fiber cable property ensured for the optical fiber cable, but also the conduction function is enhanced, the thunder and lightning conduction is improved, the ratproof property is improved, and the rapidness and the convenience in construction are achieved by using the special process steel strip after an uncoated layer is peeled off, so that the construction period and the construction cost are greatly reduced.

The invention belongs to the technical field of optical cables, and discloses a nonmetal rat-proof optical cable, which is provided with a plurality of optical fibers, a loose tube (2), a first protective layer (3) and a second protective layer (6), and is characterized by also comprising an inner cushion layer (4) and a rat-proof component, the inner cushion layer is tightly attached to the first protective layer, and the rat-proof component coats the outside of the inner cushion layer; the rat-proof component is composed of a rat-proof base layer (5), a plurality of convex bodies (51) and rat-proof objects (511), the convex bodies protrude upwards from the upper surface of the rat-proof base layer, and the rat-proof objects are located in the convex bodies; and the convex bodies are distributed on the rat-proof base layer at intervals in rows in the length direction of the rat-proof base layer, and the outer surfaces of the convex bodies are attached to the inner surface of the second protective layer in the non-metal rat-proof optical cable. The invention further discloses a manufacturing method of the optical cable. The following main beneficial effects are that: the structure is simpler, the manufacture is easier, the ratproof effect is better, the product structure is more stable and more reliable, and the ratproof cable is more suitable for multi-thunder areas, strong current occasions and severe environment occasions.

The invention discloses a black 70 DEG C PVC (polyvinyl chloride) rodent-resistant cable sheath material, which comprises the following components in parts by weight: 100 parts of crushed waste PVC cable sheath material, 0-2 parts of PVC resin powder, 0-1 part of dioctyl ester, 0-0.5 parts of chlorinated paraffin, 0-0.5 parts of a composite stabilizer, 0-0.2 parts of bisphenol A, 0-0.3 parts of lubricant, 0.-0.5 parts of color masterbatch, and 2-3 parts of rodent-resistant masterbatch. After tests, all of the indicators of the 70 DEG C PVC cable sheath material disclosed by the invention exceed national standards, so that the PVC cable sheath material completely meets the use requirements of enterprises. The tested indicators are as follows: tensile strength>=15.0MPa, breaking elongation>=180.0%, low-temperature embrittlement impact temperature of -25 DEG C, volume resistivity at 20 DEG C>=1.0*10<8>ohm.m, thermally stable time at 200 DEG C>=50min, and protection rate of 100%.

The invention discloses a flexible armored butterfly-shaped optical cable and a manufacturing method, which relate to the field of communication hardware manufacturing. The optical cable provided by the invention comprises a suspension wire, an outer sheath, a plurality of reinforcing members and an armored subunit, wherein the spiral steel belt in the armored subunit wraps an armored protection optical fiber, so that the optical fiber can be prevented from being broken after the outer sheath is damaged by mice and other animals; the outer sheath is of an 8-shaped self-supporting structure, sothat good installation performance is achieved while the tensile capacity is ensured; the optical fiber contained in the optical cable has a large degree of freedom in the armored layer and is basically free from external effects such as extrusion, stretching and the like, so that the optical cable has better transmission performance; the optical cable is simple in structure, safe and reliable.

The invention relates to the technical field of PVC (polyvinyl chloride) materials, in particular to a rat-proof PVC modified material and a preparation method thereof. The rat-proof PVC modified material comprises raw materials in parts by weight as follows: 80-120 parts of PVC resin, 45-65 parts of a plasticizer, 25-45 parts of a filling agent, 3-7 parts of a heat stabilizer, 2-4 parts of an impact modifier, 0.8-1.6 parts of a rat proof agent, 0.6-1.0 part of a lubricating agent and 0.3-0.7 parts of other aids. According to the rat-proof PVC modified material, each property of the prepared rat-proof PVC modified material exceeds the national standard with the adoption of the raw materials and through strict control of the weight ratio of the raw materials, the rat proof effect is good, and the rat-proof PVC modified material is environment-friendly and has excellent temperature resistance and weather fastness, high strength, excellent impact resistance, good flame retardant effect, excellent processing performance and excellent overall performance.

The invention discloses a miniature easy-to-branch rat-proof photoelectric composite cable for a wireless small base station and a method for preparing the photoelectric composite cable. The photoelectric composite cable comprises an optical unit located in the center, electric units symmetrically arranged on two sides of the optical unit, and an outer sheath wrapping the optical unit and the electric units. The optical unit comprises a wire core and a rat-proof protection layer wrapping the wire core. The rat-proof protection layer comprises an inner protection layer, a middle protection layer and an outer protection layer, wherein the inner protection layer is a metal armor layer, and the middle protection layer is a rat-proof layer. The rat-proof layer is prepared from the following components in parts by weight: 10 to 12 parts of PV plastic; 23 to 25 parts of ABS plastic; 1.6 to 1.8 parts of compatilizer, namely, ABS-g-MAH; and 2 to 4 parts of plant rat-proof agent. The plant ratproof agent is prepared from the following components in parts by weight: 35 to 41 parts of capsaicine; 42 to 44 parts of berberine; 12 to 14 parts of crotin; 6 to 8 parts of sophocarpidine; and 3 to 5parts of nicotinic acid. The outer wall of the outer protection layer is sawtooth; and a plurality of convex parts and a plurality of concave parts are arranged in the circumferential direction of theouter protection layer, wherein the convex parts and the concave parts are sequentially and alternately arranged. The rat-proof photoelectric composite cable has the advantages of remarkable ratproofeffect, light weight and low cost.

A non-metal armored three-sheath self-supporting rat-proof optical cable comprises a cable core, a sheath layer, a force bearing element and a rat-proof layer, the sheath layer comprises an inner sheath, a middle sheath and an outer sheath, the inner sheath, the middle sheath and the outer sheath are sequentially arranged on the outer side of the cable core, the force bearing element is arranged between the inner sheath and the middle sheath, and the rat-proof layer is arranged between the middle sheath and the outer sheath. The optical cable is simple and reasonable in structural design, thethree-layer nonmetal sheath structure is adopted, and the force bearing element is arranged between the inner sheath and the middle sheath, so the tensile property of the self-supporting optical cableis remarkably enhanced; and moreover, the rat-proof layer is arranged between the middle sheath and the outer sheath, so that a better rat-proof effect can be achieved. The preparation process is simple in operation and low in process cost, and the optical cable prepared by the method has remarkable tensile property and bending property, light weight, simple construction operation and easy laying.

The invention provides a lightweight anti-rodent optical cable, which includes a cable core, an inner sheath, an armored reinforcement layer and an outer sheath arranged sequentially from the inside to the outside; the armored reinforcement layer includes several reinforcements arranged at intervals , the reinforcement members are evenly distributed on the outer circumference of the inner sheath with the cable core as the center. Both the inner sheath and the outer sheath are HDPE sheaths. In the present invention, the strength members of the armor reinforcement layer are evenly arranged at certain intervals. Obviously, the number of armor reinforcement members used is much less than that in a close arrangement, the weight of the optical cable will be reduced a lot, and the production process is relatively simple. Secondly, At present, the size of the reinforcement commonly used in the market is more than 0.8mm. The reinforcement in the invention can use a reinforcement with a smaller diameter, and the amount of sheathing material used will be greatly reduced, which not only effectively reduces the cable heavier and more economical.

The invention discloses an access network and indoor wiring optical cable, and relates to the technical field of communication optical cables. From the outside to the inside, the optical cable sequentially comprises an external sheath, an aluminum belt which is disposed in the length direction of the optical cable, a water-blocking tape which is disposed in the length direction of the optical cable, a reinforcing element, the interior of which is provided with two rip cords which are disposed in the length direction of the optical cable, an internal sheath, and a cable core which comprises at least one optical unit and a nonmetal reinforcing part wrapping the periphery of an optical element. The optical unit comprises a micro-beam tube and a plurality of optical fibers disposed in the micro-beam tube. The interior of the micro-beam tube is provided with a flame-retardate water-blocking element. According to the invention, the external sheath and the aluminum can be peeled off easily from the rip cords. When the optical cable is connected to a splice box or indoors, the parts outside the internal sheath can be removed, and the indoor connection and indoor wiring can be met. The application range of the optical cable is enlarged, and the construction difficulty and cost of optical cable home entry are reduced. Moreover, the construction efficiency of optical cable home entry is greatly improved.

The invention discloses a rat baffle with an ultrasonic rat-expeller. The length of the rat baffle equals to the width of a doorframe; an ultrasonic rat-expeller is embedded in the inner of the rat baffle. When force is applied from outside of a door by a worker, the rat baffle will be opened; after the worker enters a room, the rat baffle is closed; it can prevent rats and is convenient for workers to enter and leave the room. For heavy equipment handling, door stops of the rat baffle can be secured, which is fully open for easy handling. The key is to use the frequency and sound pressure ofultrasonic wave to drive away the rats, which can not only prevent the rats from passing through, but also interfere and expel them physiologically through the ultrasonic rat-expeller.

The invention discloses a deratization and rat-prevention method, and belongs to the technical field of deratization. The technical solution main point is that the method comprises the following steps: rodent situation investigation: investigating rodent species distribution, density and outdoor migration ways; scheme formulation: formulating a scheme and preparing poison bait appliances accordingto the distribution density of target rats; deratization measures: putting poison bait according to the indoor and outdoor environment; rat-prevention measures: sealing holes, gaps and pipeline outlets; consolidation measures: setting poison bait sites at corners or borders of rat invasion and rat activity places; and rat corpse treatment: burning or deeply burying rat corpses. The method solvesthe problem of poor effects of conventional deratization.

An environment-friendly type full automatic cake making machine is characterized in that a dough mixing forming mechanism, a product translation mechanism, an expansion pressing mechanism, a forming mechanism, a sesame supplying mechanism, an oven and an electrical controller are arranged on a housing; the electrical controller controls the above mechanisms to work, and man-machine interface operation, infrared heating, temperature automatic control, fault and material shortage automatic warning, and data display can be achieved; Feeding, filling adding, chewing material adding, forming, sesame pasting and finished product acquisition can be automatically controlled, and an operator only needs to add raw materials according to a parameter set by a control system. The environment-friendly type full automatic cake making machine is small in size, can avoid pollution, is low in energy consumption, can save labor and relieve the working load, is high in yield, is clean in food, and is wide in application range.

The invention discloses a black 90-DEG C thermal-plasticity low-smoke zero-halogen flame-retardant polyolefin rat-proof sheathing compound. The thermal-plasticity low-smoke zero-halogen flame-retardant polyolefin rat-proof sheathing compound comprises the following components in parts by weight: 70-80 parts of black regenerated low-smoke zero-halogen granular materials, 0-10 parts of EVA (ethylene vinyl acetate copolymer), 0-15 parts of aluminum hydroxide, 0-5 parts of magnesium hydroxide, 0-6 parts of lubricants, 0-0.5 parts of coupling reagents, 0-3 parts of compatilizers, 0-0.4 parts of antioxidants, 2-3 parts of rat-proof master batches and 0.5-1.5 parts of color master batches, wherein the black regenerated low-smoke zero-halogen granular materials are recycled waste low-smoke zero-halogen plastic particles, in the content, the weight of the EVA is not less than 25%, the weight of the aluminum hydroxide or the magnesium hydroxide is not less than 50%. According to the regenerated thermal-plasticity low-smoke zero-halogen flame-retardant polyolefin rat-proof sheathing compound which is detected, the mechanical property and the anti-ultraviolet-ray property both surpass the national standard and conform to the using requirements of enterprises completely. The detection indexes are as follows: the tensile strength is more than or equal to 9.0MPa, the elongation at break is more than or equal to 150.0%, the low-temperature embrittlement impact temperature is below 30 degrees, the oxygen index is more than or equal to 32, after the aging is performed to the sheathing compound at 158 DEG C plus or minus 2 DEG C for 168h, the change ratio of the tensile strength of the sheathing compound is less than or equal to plus or minus 25, the change ratio of the elongation at break of the sheathing compound is less than or equal to 25, and the protection ratio of the sheathing compound is 100%.

The invention provides a ratproof device and an air conditioner. The ratproof device provided by the invention comprises a slide way support seat, a shielding structure and a diameter adjustment device, wherein a tube outlet hole, and a slide way arranged at the peripheral side of the tube outlet hole, are arranged on the slide way support seat; a first end of the shielding structure is slidably arranged in the slide way to adjust a distance between a second end of the shielding structure and the centre of the tube outlet hole; and the diameter adjustment device is in rotatable fit with the slide way support seat to drive the first end of the shielding structure to slide along the slide way. In the ratproof device and the air conditioner, which are provided by the invention, under the driving of the diameter adjustment device, the first end of the shielding structure slides in the slide way, and then the distance between the second end of the shielding structure and the centre of the tube outlet hole is adjusted, that is, a part of the tube outlet hole of the shielding structure is shielded, thus the size of an opening of the tube outlet hole is changed, and then the size of the opening of the tube outlet hole can be adjusted to adapt to the size of a connection tube, a gap between the tube outlet hole and the connection tube is reduced, and therefore, a good ratproof effect is brought.