CN203451619U

CN203451619U - Sieve basket used for processing fiber material

Info

Publication number: CN203451619U
Application number: CN201320306743.2U
Authority: CN
Inventors: 塔里娅·莱蒂宁; 若尼·米耶蒂宁
Original assignee: Metso Paper Oy
Current assignee: Valmet Technologies Oy
Priority date: 2012-06-15
Filing date: 2013-05-30
Publication date: 2014-02-26
Anticipated expiration: 2023-05-30
Also published as: FI20125668A; AT13675U1; DE202013101853U1; FI124364B

Abstract

The utility model relates to a sieve basket used for disposing a fiber material. The sieve basket is provided with a sieve surface on the input current side of the fiber material, a sieve hole is formed in the input side and is used for guiding part of fiber material input from the input side of the sieve basket to the receiving side of the sieve basket. In an embodiment of the utility model, at least part of the length of the wall of the sieve surface and at least part of the length of the sieve hole are respectively coated with a first coating at the input side, and each first coating contains chemical nickel. In addition, at least part of the sieve surface arranged at the input side and coated with the first coating is coated with a second coating, and the second coating is a hard chrome coating or a hard metal coating.

Description

Basket for the treatment of fibrous material

Technical field

The utility model relates to the basket for the treatment of fibrous material for applying in the processing of fibrous material, and it has wear-resistant coating.

Background technology

Basket (Siebkorb) is applied in the manufacturing processed of fibrous material in papermaking and Pulp industry, is used for sub-argument from the raw material of different lengths and fiber to go out impurity.It can be new wooden material or the used Paper or cardboard from trees that fibrous material initially starts from it.

Compass screen surface on basket comprises sieve seam, the liquid in fibrous material mixture that will process in sieve apparatus and can stitch from the input side of screen drum and flow to an outside of shining tin, receiver side namely by sieve by the definite fiber composition of sieve seam size, and continue therefrom in raw material manufacturing processed mobile.The composition that does not flow to the receiver side that shines cylinder from shining the input side of cylinder of fibrous material mixture is removed, to proceed, processes.For basket, also can use this appellation of screen drum, that is to say, it relates to the worn parts being fixed on sieve nest.Whole equipment is called as sieve apparatus.

In the sepn process of fibrous material mixture, particularly the hard impurity in fibrous material, as sand, glass and metal, can produce wearing and tearing to the profile of the compass screen surface of basket and sieve seam.Abrasion piece to metal, as basket, can be according to electrochemical mode by hard chromium plating, namely coating is set by precipitate pure chromium from electrolytic solution to the surface of parts.By hard chromium plating, reach such object: strengthen surperficial hardness and also improve thus the wear resistance of parts.When hard chromium plating, can in the electrolytic solution (chrome acid bath) adopting, adopt vitriol as catalyzer or adopt organic catalyst.In hard chromium plating, form sexavalent chrome (Cr ⁶⁺), it is that highly carcinogenic poisonous rubbish and it may be discharged in process of production together with waste water.Whole chrome acid bath also must upgrade with the specific timed interval.In the situation that coat-thickness is larger, there is crackle and embrittlement in being problematic in that in chromium plating.

A kind of laminated coating of basket has been described in patent publication us US2004/0195158.This coating not only comprises hard chromium plating coating but also comprises the coating of iron-free, and the coating of this iron-free, as marker, is used for identifying the wearing and tearing of hard chromium coating.

Utility model content

Of the present utility model to liking, a kind of basket that is used for fibrous material to carry out sorting and processing, this basket comprises compass screen surface and on input side, comprises sieve aperture mouth in the inlet flow side of fibrous material, wherein, described sieve aperture mouth is arranged to for a part for the fibrous material of inputting on basket input side is directed on the receiver side on basket.Basket is characterised in that, at least a portion of the wall body length of compass screen surface and sieve aperture mouth is coated with the first coating on the input side of basket, and this first coating comprises chemical nickel.In addition, the feature of basket is also, at least a portion that is coated with the compass screen surface of the first coating is coated with the second coating on input side.This second coating can be hard chrome coating or the hard metallic coating that contains wolfram varbide.

According to a kind of embodiment of the present utility model, the thickness of the first coating is 5 to 80 μ m, is preferably 10 to 60 μ m, most preferably is 10 to 40 μ m.

According to a kind of embodiment of the present utility model, the thickness of the second coating is 50 to 500 μ m.

According to a kind of embodiment of the present utility model, the two coatings of the first coating and the second coating formation, in this pair of coating, the relative share that the thickness of the first coating accounts for two coat-thicknesses is less than the thickness of the second coating.

According to a kind of embodiment of the present utility model, the sieve aperture mouth on basket has such diameter: this diameter at least consists of the thickness of the first coating at least in part from the direction of input side.

According to a kind of preferred implementation of the present utility model, the diameter of the sieve aperture mouth on basket is 0.1 to 15mm, and preferably 0.1 to 0.8mm.

According to a kind of embodiment of the present utility model, the first coating of basket is chemical nickel coating, and this chemical nickel coating comprises 1% to 14% phosphorus or 1% to 6% boron.

According to a kind of embodiment of the present utility model, the second coating consists of the hard metallic coating that contains carbide, and this hard metallic coating is the thermospray in the first coating is made on compass screen surface coating.

According to a kind of embodiment of the present utility model, the hard metallic coating that contains carbide is the coating that comprises tungsten carbide particle and/or chromium carbide particle.The hard metallic coating that contains wolfram varbide says it is the coating of one of following metal alloy: WC-10Co-4Cr, CrCr in chemical composition ₃c ₂-25NiCr, WC-20Cr ₃c ₂-7Ni or Cr ₃c ₂-37WC-18.Metal alloy can for example consist of the metal alloy that mainly contains nickel and cobalt.

According to a kind of embodiment of the present utility model, at least a portion of the wall body length of sieve aperture mouth is coated with chemical nickel and forms sieve orifice diameter, for example sieve of wire basket seam from the direction of input side.At least 5%, preferably at least 10% of sieve orifice diameter consists of chemical nickel.

According to a kind of embodiment of the present utility model, chemical nickel coating forms by immersion liquid coating in nickel plating bath, wherein, the phosphorus content in this nickel plating bath be 1% to 14% or boron content be 1% to 6%.Chemical nickel coating can be before the second coating formation by coated component is hardened with the thermal treatment of 200 to 500 ℃.

According to a kind of embodiment of the present utility model, the hard metal that the second coating contains wolfram varbide by use carries out thermospray and forms.Described thermospray can be implemented in the direction of the surface profile perpendicular to first surface on compass screen surface.

According to a kind of embodiment of the present utility model, the wear resistance of the hard metallic coating of thermospray can be by for example improving to this surface system of brushing or polishing with diamond brush or abrasive band.The surface of polishing can also prevent that fiber and impurity from adhering to from the teeth outwards.This surface can also reduce resistance to flow, and this makes to choose and can save best energy at such minute, at this minute, chooses, and basket rotates and blade rotor is the stator that is fixed on this position.

According to a kind of embodiment of the present utility model, coating method is also included in the parts that form before the first coating from existing pair of coating of surface removal.Existing pair of coating can be removed by chemical treatment, that is, two layers of two coatings are dissolved simultaneously.

Accompanying drawing explanation

Below with reference to accompanying drawing, describe some embodiments of the present utility model in detail, wherein:

Fig. 1 has illustrated the structure of the basket of seeing from the end of basket with cross-sectional view;

Fig. 2 has illustrated the structure of the hole sizer plate on hole sizer basket with cross-sectional view;

Fig. 3 has illustrated the example of the hole sizer section (Lochsiebprofil) of basket with cross-sectional view;

Fig. 4 has illustrated the example for the gap sieve section of basket with cross-sectional view;

Fig. 5 has illustrated from sieving the structure of the wire basket of seeing end wiry with cross-sectional view;

Fig. 6 has illustrated from sieving the structure of the cated wire basket of the painting of seeing end wiry with cross-sectional view;

Fig. 7 has illustrated from sieving the structure of the cated wire basket of the painting of seeing end wiry with cross-sectional view;

Fig. 8 has illustrated from sieving the structure of the cated wire basket of the painting of seeing end wiry with cross-sectional view;

Fig. 9 has illustrated from sieving the structure of the cated wire basket of the painting of seeing end wiry with cross-sectional view;

Figure 10 has illustrated from sieving the structure of the cated wire basket of the painting of seeing end wiry and for the example of the jet angle of thermospray with cross-sectional view;

Figure 11 has illustrated from sieving the structure of the cated wire basket of the painting of seeing end wiry and for the example of the jet angle of thermospray with cross-sectional view;

Figure 12 shows the schematic diagram through the coating of thermospray.

Embodiment

In this application, concept " basket " refers to the abrasion piece of sieve apparatus, and it is used in the cleaning of fibrous material mixture and divides and choose.Basket can be to be provided with the hole sizer basket in hole or the wire basket consisting of wire, and wire basket has gap or gap length between each wire.Basket can be also the gap basket being formed by machining by plate.For hole sizer basket, gap basket and wire basket, use in this application general designation " basket ".Basket also can be called as screen drum.

For the hole in basket or gap, use and be referred to as " aperture " or " sieve aperture mouth " in this application.On basket, the sieve aperture mouth of basket is formed by the input side of compass screen surface and the passage between receiver side, and this passage has circular shape or the shape of elongated gap conventionally, and wherein, sieve aperture sieves in other words seam that is sieve aperture mouth is positioned at the narrowest position of passage.Sieve aperture mouth for the sorting capability of basket, has core meaning for trafficability characteristic that is for producing on the one hand on the other hand.Passage between input side and receiver side also can have other shapes.Aperture or passage in basket are manufactured by this way:, the narrow positions operated by rotary motion of aperture or passage is being compared the edge of more close input side with the edge of receiver side.Input orifice or passage are from the input side edge of compass screen surface to the position constriction of sieve aperture or sieve plate or attenuate, and aperture or the passage edge from this position to receiver side expands.The narrowest position also can be arranged on the edge of input side or also can be arranged in some cases the edge of receiver side.Liquid in pending, fibrous material mixture and the outside that can flow to basket from the input side of basket by the sieve aperture mouth on basket in sieve apparatus by the composition of the definite fiber of sieve aperture mouth size flow to receiver side in other words.Term " diameter " is the common name as the width of sieve plate in the diameter in the hole in hole sizer basket or wire basket or gap basket in this application.

Term " abrasion piece " refers to such parts, and it at least stands coming off of the wearing and tearing undertaken by different machinery that is material with a surface, for example on these parts, causes thus the weakening of pressure decreased, size change and distortion or surface quality.Wearing and tearing also may occur by the wearing and tearing that adhere to, the abrasion and corrosion wearing and tearing of abrasion.Term " two coating " refers to such coating, and it consists of the first coating and the second coating.For two coatings, also can use title duplex coating or combination coating.

As long as no pointing out in addition, percentage value is weight percent in this application.Before numerical value, with symbol >, represent " more, be greater than " and represent " still less, being less than " with symbol <.

The schematic diagram of the axial direction due along basket of the basket 1 shown in Fig. 1 in sieve apparatus that is the cross section of seeing from the end of basket.The interior week of basket forms compass screen surface on basket.The compass screen surface 2 of basket 1 can consist of the hole sizer plate of arc.Selectively, the compass screen surface of basket also can consist of the sieve wire being arranged side by side, and sieve wire is generally arranged on support bar 4, and at this, support bar bends to circle, to reach the special diameter H of basket.Sieve wire also can be arranged on the mounting ring being formed by plate cutting, has saved thus independent bending machining.The input side of fibrous material (inlet flow side) S can be positioned on the inner side 10 of basket, fibrous material flows laterally from the inner side of basket thus.Selectively, the input side of basket can also be positioned on the outside of basket, that is fibrous material outside-in 10 flows.

In Fig. 2, schematically shown the cross-sectional view of the structure of compass screen surface 2 on basket 1, compass screen surface consists of plate 6 and the hole/gap in this plate 8, and described hole/gap consists of the aperture of the mono-Side direction receiving side AK of inlet flow S from basket.These apertures not only have the first wall body 5 but also have the second wall body 7.The total length of these wall bodies equals the size of compass screen surface from input side to receiver side.Aperture can equate with regard to diameter, and its wall body can extend abreast, as shown in Figures 2 and 3.Selectively, the diameter of aperture on compass screen surface receiver side AK can be greater than the diameter on the input side S of basket, as shown in Figure 4.Face in the input side S of plate 6 direction 18 forms the compass screen surface 2 on basket input side S, is positioned at the face in inlet flow S mono-side of fibrous material.

The selectable structure of compass screen surface has been shown in Fig. 3 and Fig. 4, and at this, the face 18 in the direction of the input side S of plate 6 is configuration.The face of the configuration of plate forms the compass screen surface 2 on input side S, and the face of this configuration can be for example such: first wall body in aperture 8 is higher than the second wall body.The hole sizer basket of configuration for example can be manufactured in this manner, that is, in cylinder, with machinery, make profiled member and get out a plurality of holes.

Wire basket for example also can be made by compass screen surface plate, and this compass screen surface plate is by mechanically additional, bonding or by welding, the sieve wire of cold-drawn is fixed on support bar 4 and is made.Compass screen surface plate is also further bent to cylinder and is bonded together by welding in each end.Wire basket also can sieve wire by handle and be fixed on the mounting ring cutting out and make, and has saved thus independent bending machining.Support ring can be appended on wire or on its end, to improve rigidity, be fixed on housing with realizing.Gap basket for example can be made by mechanically making groove on the input side at basket and/or receiver side, and the degree of depth of groove will make to form on compass screen surface the continuous gap that extends to receiver side from input side.

An example of the compass screen surface 2 of wire screen basket is shown in Fig. 5, the cross section for seeing from the end of sieve wire 22 in figure with cross-sectional view.Three sieve wires 22 that are arranged in juxtaposition are shown in the drawings, and they arrange according to following mode each other side by side with specific spacing:, remain with sieve seam 3 between them.First surface 12 wiry is positioned at a side (input side) of inlet flow S and a part for the face on formation compass screen surface 2 input sides for fibrous material.Wire has the first side 14 and the second side 16.The total length of side equals the length of this side from input side to receiver side.Sieve seam 3 resides between

side wiry

14 and 16 arranged side by side on input side.Be associated with sieve seam, title ' wall body ' also can be for side.The first surface of the input side S direction along basket wiry arranged side by side forms the compass screen surface on basket input side, that is is positioned at the face of inlet flow S mono-side of fibrous material.Compass screen surface on input side also comprises sieve tip 20 wiry.

Basket is generally made by metallic substance.Metallic substance can be for example acidproof stainless steel (FeCrNiMo), as according to the austenitic stainless steel of EN standard 1.4404,1.4307 or 1.4547 or dual phase steel 1.4462.Basket particularly stands corrosive wear in practice, and this corrosive wear is to cause due to the solid of motion in material stream and hard particle collision wearing surface.In basket, the compass screen surface on input side S 2 and frayed towards the unlimited

sieve aperture mouth

3,8 of input side particularly, in other words, that is the sieve wire on compass screen surface 2 is in the surface 12 of fibrous material inlet flow S mono-side and limits each

side

14,16 of sieve clearance distance wiry side by side in wire basket, particularly frayed in inlet flow one side.Correspondingly, the surface 18 of inlet flow one side on the mesoporous metal filament plate 6 of hole sizer basket and the edge surface (wall body) in hole/aperture 8 particularly from inlet flow S mono-side through frayed.The sieve profile wiry of basket for example can be frayed by this way: cause thus the increasing of sieve between each wire seam 3/reduce or the cause rounding in inlet flow one side tip 20 wiry.Size, quality, momentum and the hardness of particle of collision and the thickness of coating and hardness all can exert an influence to wearing and tearing in addition.Sieve

aperture mouth

3,8 on input side compass screen surface particularly stands the wearing and tearing that fine particle causes.The increasing of sieve seam has for example weakened the clean/sorting capability of basket.For example, the wearing and tearing of the profile wiry on wire basket cause reducing of input side place turbulent flow, and this causes again reducing of basket capacity.

The wear resistance of basket can be improved by two stage coating process, realizes two coatings by this coating process on the surface of basket, and this pair of coating consists of the first coating and the second coating.The surface being positioned at below the first coating can be called to basic material surface.At least the compass screen surface on basket 2 has coating.According to a kind of embodiment, be mainly on the compass screen surface of basket, be on the

compass screen surface

18,12 on input side at least on the surface of inlet flow S mono-side of fibrous material, there are two coatings.Preferably, at the

sieve aperture mouth

3,8 being arranged on compass screen surface 2, be provided with at least one coating.Particularly, on the wall body of sieve aperture mouth, have coating, this coating is in a side of inlet flow S on compass screen surface substantially.This coating not necessarily will be in the whole length of sieve aperture mouth, in aperture, the whole wall body length from inlet flow S mono-side to receiver side AK is extended.For example, this coating can exist according to 3 of the clearance distance on wire basket on the length-specific sieving on

side

14,16 wiry.For example, this coating can only extend to the connecting portion between sieve wire and support bar on sieve each side wiry, as shown in FIG. 6.According to one preferred embodiment, particularly the first coating forms on the input side at basket on whole compass screen surface 2.In addition, the first coating narrow positions at sieve aperture mouth or passage in sieve aperture mouth or in passage forms.Coating also can exceed a little the narrow positions of sieve aperture mouth or passage and extend towards the direction of receiver side AK from the direction of input side S.By regulating the thickness of the first coating, hole or gap in basket can be preferably set, be the diameter of sieve aperture mouth.

Can carry out coating to Manufactured basket structure, for example, screen drum or the hole cylinder of needed support ring is installed therein.Alternatively, also can carry out coating to independent abrasion piece, as for example before manufacturing compass screen surface plate to end support ring and/or wire coating.Manufactured compass screen surface plate is cylindraceous before bending to barrel shape or before forming basket structure.Particularly, this coating process is suitable for the coating of wire basket.This coating process also can be used for the basket of wearing and tearing to supplement coating.

According to of the present utility model pair of coating, be preferably also applicable to such basket, the diameter of the sieve aperture mouth in this basket on its compass screen surface 2 is less than 15mm, but is at least 0.1mm.The diameter in hole is for example that 0.1 to the 15mm width that sieves seam is 0.1 to 0.8mm.

In carrying out the first stage of two coatings, to chemical nickel EN(EN=electroless nickel plating for a surperficial part for the surface of parts or parts) carry out coating.More precisely, utilize reductive agent on the surface of parts, to implement controlled autocatalytic nickel precipitation.This pair of coating process also can be called autocatalytic chemical nickel plating.The coating forming in the first stage is called as the first coating.According to an embodiment, at least a portion of the wall body length of compass screen surface 2 and

sieve aperture mouth

3,8 is coated with the first coating on input side S, and this first coating comprises chemical nickel.The thickness of the first coating can be for example 5 to 80 μ m, is preferably 10 to 60 μ m, most preferably is 10 to 40 μ m.

When carrying out chemical coating with nickel, do not need outside electric current supply, but chemical reaction in electrolytic solution produces electronics.By the method, can for example on the basket surface of being made by metallic substance, by reductive agent, carry out nickel deposited coating (nickel coating of reduction).Can be with phosphorus or boron compound as reductive agent.Can be using the parts for the treatment of coating as negative electrode.Treat that the parts of coating are also as catalyzer.The nickel coating reducing on parts surface is catalysis (having catalysis), continues thus reaction to carry out catalysis, even if also coating reaction is proceeded and can be produced thick coating.If this coating is not catalysis,, when the coated metal in the surface of the parts until coating covers, coating reaction stops.

The coating of chemical nickel plating is not pure nickel, but always contains or phosphorus, boron or tin according to the kind of reductive agent.An exception is to use hydrazine (Hydrazin) as reductive agent, makes thus nickel as pure nickel, deposit on the surface of parts for the treatment of coating.The coating of pure nickel is seldom.

In chemical nickel coating, that is in the first coating, except nickel, always have the second material, that is what relate to is except nickel, according to the kind of reductive agent, also to contain the combination coating of boron for example or phosphorus.In chemical nickel coating, except phosphorus and/or boron, also may there is cobalt or tungsten.Also can in nickel plating bath, add alloying element, as aluminum oxide, diamond particles, boron nitride or silicon carbide, can obtain different dispersion coatings thus.Nickel coating mainly consists of nickel, and the amount of nickel is 100% to deduct phosphorus, boron and/or other additive.

Be not only the composition of nickel plating bath and the composition that process parameter also affects chemical nickel coating.Nickel plating bath can also comprise other stablizer, accelerator, plural components, buffer substance (Pufferstoffe) and/or surfactant.The pH value of nickel plating bath and the reductive agent using also affect the temperature while carrying out coating.Application temperature can be between 60 to 100 ℃.When application temperature is during lower than 60 ℃, coating speed generally can be very low, for example, lower than 5 μ m/h.Coating time is favourable with regard to saving energy fast.In the electrolytic bath based on hypophosphite (Hypophosphit) of acidity, application temperature is preferably 80 to 90 ℃.

Can for example by oxidation, utilize phosphoric acid salt to carry out coating to parts, wherein, as reductive agent, for example use hydrophosphate or sodium phosphate salt.Electroless nickel bath comprises about nickel of 1 to 8g/l.In nickel plating bath, as nickel, for example can use single nickel salt or nickelous chloride.PH value in nickel plating bath for example can be between 4 to 5 or between 8 to 11.PH value in bath for example can regulate by ammonia, sodium hydride or sulfuric acid.Phosphoric acid salt bath be hold manageable, advantageously and can realize the enforcement of heavy metal free.Phosphorus content in bath can be between 1% to 14%.At Ni ²⁺/ H ₂pO ₂nickel in-bath and the molar ratio of hydrophosphate should be arranged in 0.25 to 0.60 scope, preferably in 0.30 to 0.45 scope.The phosphorus content of coating can be low phosphorus content wherein the weight of phosphorus account for 1% to 7%, medium phosphorus content wherein the weight of phosphorus account for 7 to 10p-%, or high content of phosphorus wherein the weight of phosphorus account for 10% to 14%.The temperature that nickel is bathed and the pH value of particularly bathing affect phosphorus content.The pH value of bathing by reducing nickel, the phosphorus content of the phosphorus content rising in nickel bath and the nickel coating that correspondingly will form in nickel is bathed also raises.The general phosphorus content forming as nickel coating of phosphorus content that nickel is bathed.

Alternatively, nickel is bathed and can also be comprised boron compound as reductive agent.In the first coating, in bathing according to nickel, the content of boron compound forms 1% to 6% boron.In the application that needs hardness and wear resistance, the boron content of coating can be chosen as at least 2%.As reductive agent, for example can use 0.2% to 4% dimethylamine.Selectively, can use the Sodium Bromide between 4% and 7%.The pH value of the bath that comprises boron can be for example between 5 and 14.

In acid operating environment, the erosion resistance of low-phosphorous nickel coating is weaker than the erosion resistance of the nickel coating of high phosphorus.Alkalescence, containing in the operating environment of alkali, the erosion resistance of low-phosphorous nickel coating is better than the erosion resistance of the nickel coating of high phosphorus.The pH value of the pH value of acid operating environment operating environment of alkalescence lower than 7 is higher than 7.In putting into practice border, the weakness of phosphorus content in pH value lower than 4 or occur higher than 9 in the situation that.In some screening processes, pH value is lower than 4 or higher than 9, but pH value is between 4 and 9 in traditional screening process.

Thermal treatment has weakened the erosion resistance of low-phosphorous nickel coating, because almost whole phosphorus forms compound independent, that form hardness together with nickel.Form thus high phosphorus and low-phosphorous region, between these regions, formed the potential difference that promotes corrosion.In the nickel situation of high phosphorus, heat treated effect is lower or unimportant.

By phosphorous nickel coating is heat-treated, can significantly improve the hardness of coating.For example on phosphorous nickel coating, during heating treatment form hard compound, as for example Ni ₃p.The hardness of coating was regulated by heat treated time and temperature.The nickel coating of boracic has been hard especially not having in heat treated situation, but it also can be improved by thermal treatment.According to a kind of embodiment, for to needing the abrasion piece of erosion resistance to carry out coating, need to use phosphorous nickel, for example there is the nickel coating of high phosphorus content, it contains 10% to 14% phosphorus.By thermal treatment, also can realize the optimum coating with regard to erosion resistance and hardness.

Micro-Vickers' hardness of the nickel coating of chemistry can be roughly 500HV(1N load).Hardness can even be brought up to numerical value 1.100HV(1N load by thermal treatment).Microhardness

according to DIN50133, determine.For the parts for the treatment of coating, thermal treatment for example can be implemented at the temperature of 200 to 500 ℃.Coated parts for example stand the little duration of thermal treatment one of 450 ℃, can obtain thus the coating Vickers' hardness of about 1.000HV.By advantageously selecting heat treated temperature and time, the first coating is obtained to desired hardness and erosion resistance.Through heat treated chemical nickel coating, with regard to color, be flavous.Flavous color can be as wear indicator when estimation supplements coating demand.Color by the first coating can be visually definite simply, and when the profile of parts also can be corresponding to original profile reparation, for example, by supplementary coating.By passivation, nickel coating can also be formed to black.The color of black can correspondingly be indicated as the vision of wearing and tearing.The color of black without thermal treatment obtain, when considering for example thermal treatment to corrosive effect and may follow the distortion of basket after thermal treatment, this can be favourable.The microhardness of pressing the nonheat-treated Ni-P-nickel coating of chemical mode can be for example 500HV200, and this coating contains 10% to 14% phosphorus.The hardness of corresponding coating can be for example 900HV200 in heat treated situation.Microhardness is determined according to DIN50133 and HV200=200g/2N.

The magnetization of the nickel coating of chemistry causes difficulty may to the manufacture of the second coating.Hard chrome coating is to manufacture in the situation that utilizing electric current, and the magnetization of nickel coating may damage current density and/or adversely locate its direction vector thus.This magnetization also may cause disadvantageous eddy current in the jet of thermospray, because liquid metal and gas may partly ionize or otherwise polarization.In nickel-phosphor coating, low phosphor coating is that ferromegnetism is the strongest, the coating of middle phosphorus content in magnetic ten times lower than low-phosphorous nickel coating.The nickel coating of high phosphorus is nonmagnetic.Thermal treatment strengthens five times because the rearrangement being caused by phase transformation (Neuanordnung) makes magnetic.Nickel-boron coating is starkly lower than nickel-phosphor coating aspect ferromegnetism.Considering that in magnetized detrimental effect situation, advantageously, the first coating forms by the nickel of middle phosphorus content with regard to the manufacturability of two coatings, is more advantageously that the nickel by rich phosphorus content forms.

With regard to the manufacturability of two coatings, importantly, form enduringly the link between basic material and the first coating.In addition, the second coating sticks in the first coating regularly, and this also exerts an influence to two coatings.The first coating of high phosphorus has been improved the tack of the first coating on basic material.When the phosphorus content of the first coating reduces, the tack of the second coating in the first coating itself improves.This reduces owing to the stress forming in coating.With regard to the tack of the second coating advantageously, first coating with in phosphorus content manufacture.Generally speaking, make every effort to high as far as possible phosphorus content, reach whereby the good erosion resistance in acid environment, therefore preferably select the coating of high phosphorus.When the tack of the second coating is occupied an leading position or when operating environment is alkaline, the phosphorus content of the first coating can be chosen as lower (for example, in using phosphorus content).

Chemical nickel plating is immersion liquid coating, and the parts for the treatment of therein coating are immersed in pond and coating is formed uniformly on all surface of parts.By chemical nickel plating, can on parts, obtain the coating of even thickness.Coating can be for example on each side of basket, also according on clearance distance or sieve seam 3 sieves at basket each

side

14,16 wiry.If expectation, not in some zone-coating, can cover this region with mask, this mask stops adhering to of coating.In immersion liquid coating, coat-thickness increases gradually as the function of time, for example, be 16 to 25 μ m/h, 5 to 15 μ m/h or 4 to 10 μ m/h.Composition, pH value and other the coating parameter of bathing, as the mixing of coating temperature and bath, also affect the rate of growth of coat-thickness.Mixing can be for example according to mechanical system or utilize filtered air to implement.The coat-thickness of parts can be for example 5 to 100 μ m.According to a kind of embodiment of the present utility model, the thickness maximum of coating is about 60 to 80 μ m.In the coating situation of thickening, in coating, form inner tensile stress, it can cause the embrittlement in coating and form crackle.By regulating the coat-thickness of the first coating also can regulate the clearance distance of basket, i.e. the diameter of sieve aperture mouth.When two wall bodies in gap have identical coated weight, clearance distance can for example reduce the twice of coat-thickness.

The size maximum of the particle that the wall body in the aperture on the compass screen surface 2 of basket is loaded equals bore dia or wavelength width of a slit.As will be in basket on the wall body of compass screen surface 2 and the thickness of the first coating forming on the sieve aperture mouth of inlet flow S mono-side of fibrous material, preferably be chosen as at least 5% of gap diameter, more preferably at least 10%, make thus to apply and structurally form enough thick layer, the load that the particle that it is able to take to be loaded by effects on surface causes.Hole on the compass screen surface of basket or the gap in aperture, to be passage can preferably be adjusted to or be reduced to 10 to 120 μ m by the first coating as for example minimum size of sieve seam 3, is preferably 20 to 80 μ m.The thickness of the first coating is preferably 5 to 60 μ m here, and 10 to 40 μ m more preferably.The thickness of coating can be also 5 to 20 μ m.In the situation that for example lower than the less coat-thickness of 5 μ m, compass screen surface from characteristic, say that weak basic material can cause the larger deformation load for coating, this load meeting causes shortening the life-span of coating.In addition, when overweight coating, coating becomes fragile and more easily suffers damage.By the first coating, can reach particularly and fix and wear-resisting coating in the aperture on the compass screen surface of basket.Therefore by the first coating, can regulate and improve the wear resistance of parts specific part.For example, can make wear resistance controllably for the part of input side one side of basket by coat-thickness.In addition, by the first coating, the aperture on basket can be adjusted to desired hole size or gap size or aperture size or size.The wear resistance of the clearance distance on compass screen surface can for example improve according to following mode:, clearance distance, to be that diameter is fabricated to larger than rated value, and by coating, clearance distance is adjusted to rated value.By coating, also can regulate the profile of sieve aperture mouth.

The first coating stage can be to manufacture new basket relevant conform with object measure, by this measure, on new basket, form wear-resisting coating and combine, reach desired aperture size or orifice shapes.Coating can selectively be revised, and wherein, the basket of wearing and tearing is placed in original size again by coating or the size of the basket that moved and profile combine to be adjusted to application purpose by coating and match.By coating, for example can revise excessive clearance distance, it may be the corrosive wear in or gap smooth by excessive electrolysis and causing.

The surface quality of chemical nickel coating is generally smooth and smooth, and surface roughness Ra can be for example 0.5 μ m thus.Surfaceness also can be less, for example, be 0.2 μ m.It can be for example also 2.1 μ m or 5 μ m even.The surfaceness that is mainly basic material exerts an influence to the surfaceness of chemical nickel coating.General Ni-P coating and Ni-B coating are adapted to the surfaceness of basic material.When coating comprises large particle (>1 μ m) and is distributed in brokenly in coating as norbide and particle, can obtain larger surfaceness.

In spray-on coating, it is the roughness of 3 to 6 μ m that good adhesivity, for example Ra are brought in more coarse surface.When sprayed coating in the second applying coating, advantageously, before forming the chemical nickel plating of the first coating, the basic material on surface 12 is roughened at input side, for example, by particle jet (Kornblasen).Can improve thus the tack of the second coating in the first coating, because the surfaceness of basic material copies in the first coating, it is chemical nickel coating.If the second coating is hard chrome coating, the roughness of the first coating is a kind of infringement to the surface 12 of input side or basic material.When the shape of profile covers gap and in the situation that use enough aluminum oxide coarse sands of large granularity, the roughness on the surface 12 of input side can not stitched or the surfaceness of sieve aperture mouth not exert an influence sieve, does not have thus the particle of experience wear to pass through gap.

When the aperture in basket or the surfaceness in gap are smaller, the obstruction risk of basket in the manufacturing processed of fibrous material will be low as much as possible.But when the second coating is sprayed onto in this coating, this smooth surface is not the particularly preferred substrate of the second coating.Here may need, before manufacturing the second coating, make the first coating roughening on the surface 12 of input side.When the size in basket mesopore or gap or diameter are during for 0.3mm at least, in basket, the surfaceness in aperture is larger, because basket is more insensitive for stopping up here.

In order to improve adhesion from the teeth outwards, can before being applied to the first coating, process parts the surface of parts, wherein, this surface cleaning is fallen to grease, marker color, dust and oxide compound.Make the zone of oxidation of surface isolation generally also according to chemical mode, by a surface, be for example immersed in the solution that comprises hydrochloric acid or according to electrochemical mode and be immersed in electrolytic solution and make its fragmentation, this surface is activated better for metallize thus.The composition of coating also can affect the tack of coating.By phosphorous nickel coating, compare with the nickel coating of boracic and can obtain better tack on steel surface.The tack of the nickel coating of high phosphorus on basic material is better than the tack of nickel coating low-phosphorous or that have middle phosphorus content on basic material.

According to a kind of embodiment, in the second coating stage, on chemical nickel coating, by thermospray, form the coating that contains carbide.The coating of making in subordinate phase is called as the second coating.By the second coating, for standing compass screen surface 2 wear load and wearing and tearing, on input side S, can form larger wearing and tearing leeway.According to a kind of embodiment, on the input side of the second coating compass screen surface 2 at basket 1, form, on the surface 18 on sieve wiry surperficial 12 or at sieve plate.

The coating that contains carbide can be for example by containing wolfram varbide or being formed by the hard metallic coating of chromium carbide.Also have fundamental element, as for example Ti, V, Nb, Mo, Ta and Hf, can be used as carbide and these fundamental elements can be applied in the coating that contains carbide.The coating that contains carbide is included in carbide hard in tough and tensile metal carrier body.As metal carrier body (in conjunction with parent), can use cobalt, chromium and nickel, because they soak carbide well.For the coating that contains carbide, can use the hard metallic coating of title.But in this application, the coating of carbide-containing does not refer to ceramics-metall composite, the sintering metal with ceramic main.In thermospray, can on abrasion piece, for example basket, apply as the corresponding region in hard chromium plating.

With reference to Figure 12, the coated material (bar, wire, powder) that is placed in whole or in part fusing or the state of plasticity in thermospray as particle mist by air-flow by disperse spray on the surface for the treatment of coated component, here particle mist is dispersed when collision.When cooling, by a plurality of granuloplastic lamelliform coatings 42, mechanically sticked on the surface for the treatment of coated component 40.As coated material, can use the material arbitrarily with stable melted state, as metal, pottery or its alloy.Different heat spraying methods comprises flame plating, electric arc spraying, plasma spraying, vacuum plasma spray coating, HVOF (High Velocity Oxygen Fuel) and detonation spraying, detonation flame spraying in other words.HVOF (High Velocity Oxygen Fuel) (HVOF,, HVAF) for example can be used for forming hard metallic coating, as WC-Co (Cr) and Cr ₃c ₂-NiCr.Can be than manufacturing thicker and closeer coating with HVOF spraying with HVAF spraying.Comparing thicker and closeer coating with hard chrome is favourable, because the compactness of hard chrome dies down the in the situation that of crackle formation and coat-thickness increase.The characteristic of hard metallic coating can be made matchingly by composition, the shape and size of coated powder particle and the parameter of spraying method of the coated material that will use.

According to a kind of embodiment of the present utility model, the injection firing rate of thermospray is selected in this manner considering treat coating object in the situation that:, make the part protection of the object of pending coating treat another part of coating object.Jet angle for example can be selected in the wire of basket or aperture situation in this manner considering:, the wire of orifice plate or the

clearance distance

3,8 of the profile in aperture protection between it, at this, clearance distance remains open.The example that regulates in such a way jet angle shown in Figure 10, that is, and the clearance distance 3 between the profile of wire 22 protection sieve wire.Jet angle tilts roughly to sieve profile wiry angle A in the figure, and wherein, beam 36 is substantially vertical about profile 12.Jet angle also can be less than profile angle A, is preferably roughly half of profile angle.The adhesion of spray-on coating is also relevant with jet angle.With regard to the adhesion of coating, vertical direction is best injection direction.

An example of the structure of compass screen surface shown in Figure 11, the tip of sieving therein wire profile is ground, and forms two

horizontal planes

32 and 34 thus at 12 places, the first tip wiry.When

horizontal plane

32 and 34 is for example 0 degree (tip of grinding) and 20 degree (profile angle), jet angle can be less than profile angle.During spraying spray beam 36 along profile 12 to-and-fro movements.When jet angle apparent surface 12 deviates from vertical direction, it is more weak that coating result can become, that is coating is less adhered to from the teeth outwards.In addition, the internal structure of coating can be more weak.This coating can for example comprise porousness (Porigkeit).

For the second coating of basket, the composition of coating is important, can not only reach last hardness can also reach fracture toughness property by this composition.The second coating can comprise the carbide particle (WC) in for example 200 to 800nm nano level particles, cobalt chromium matrix (CoCr).When referring to the outside dimension of particle, for the granular size of carbide, also can use term granularity.In some cases, also the trickle degree of particle of the internal structure of particle can be described by granularity.WC-Co-Cr coated component for example can comprise the cobalt of 1 to 12 % by weight and chromium and the wolfram varbide of 2 to 5 % by weight, thereby reaches 100% total quantity of material.For example, the hardness of the hard metallic coating of WC-Co base is roughly 1.000HV.The hard metallic coating of wear-resisting thermospray can also comprise other hard particle except carbide, as for example nitride, oxide compound or boride.By carbide coating, also can reduce the fracture toughness property of coating and reduce thus the corrosive wear for the treatment of coated component.The second coating can be also dual carbide lamella, and wherein, coating for example not only contains wolfram varbide but also contains chromium carbide.The granular size of chromium carbide is generally 2 to 10 μ m.The second coating can consist of hard metal, and its chemical composition is one of following: WC-10Co-4Cr, Cr ₃c ₂-25NiCr, WC-20Cr ₃c ₂-7Ni or Cr ₃c ₂-37WC-18NiCo.Cr ₃c ₂the hard metal of-37WC-18NiCo-can be replaced by the NiCo that comprises 18% another kind of alloy.Hard metallic coating by thermospray can for example reach following Vickers' hardness: WC-10Co-4Cr1000-1200HV300, Cr ₃c ₂-37WC-18 metal 900-1050HV300, CrC ₃c ₂-25NiCr800-950HV300 (HV300=300g/3N).

The wear resistance of the hard metallic coating of thermospray can be by for example improving to this surface system of brushing or polishing with diamond brush or abrasive band.The brush system on surface or the large tip on grinding polishing surface, these tips can cause coming off of coating.The surface of polishing has also prevented that fiber and impurity from adhering to from the teeth outwards.Through brush system or polished surface, reduced resistance to flow, this causes saving at the energy of minute choosing best, minute is choosing basket to rotate and is being the stator that is fixed on this position to the clean blade of basket.This sieve apparatus is called as the sieve that becomes a mandarin, and its counterpart is stream sieve.

According to a kind of implementation form, the second coating of two coatings consists of hard still crisp material.The second coating is more crisp than the nickel coating of the toughness of the first coating.The second coating is mainly positioned on the

surface

12,18 of inlet flow side of compass screen surface 2 on basket and itself forms the so-called profile on the compass screen surface of basket simultaneously.In a side of the input surface S of basket to compass screen surface 2 according to treating that the material of sorting applies the load that the particle that is for example 1 to 3mm by mean diameter causes.In order to prevent the embrittlement that runs through of the second coating, enough heavy back to form the second coating, be preferably at least 5%, more preferably at least 10% of average diameter of particles.The second coating can consist of and its thickness is for example 50 to 500 μ m the hard metal that contains carbide.Selectively, the second coating can consist of hard chrome, and its thickness is between 50 to 400 μ m.

According to a kind of embodiment, the second coating of compass screen surface consists of hard chrome.Hard chrome coating can be made by hard chrome plating according to electrochemical mode, that is from electrolytic solution, deposits pure chromium on the surface of the first coating.

According to a kind of embodiment, advantageously, in this pair of coating, the relative share of the first coating two coat-thicknesses as for example chemical nickel coating accounts for is less than the share of the second coating, is the share of hard metallic coating or hard chrome coating.The thickness of hard metallic coating is for example at least 100 μ m.

Can repeat when needed each step in the step of above-mentioned two stages coating process, for example, in order to repair damage or the wearing and tearing on basket surface.Can also repeat two coating stages.

According to a kind of embodiment, the renewal of coating is removed two coatings that exist in basket before being included in the first and second coating stages of enforcement simultaneously.The second coating that coating to be removed comprises the first coating of particularly consisting of chemical nickel and consists of the hard metal of thermospray.Coating can be removed mechanically or by water jet.Coating preferably by first coating (chemical nickel coating) of the two coatings of chemical dissolution the basic material (surface of forming metal silk) below being positioned at it remove, wherein, the second coating (the hard metal of thermospray) is also in company with dissolving.Can be for example by basket is immersed in chemical solution and is dissolved, this solution and the first coating react and the basic material below being positioned at coating comes off.Chemical solution not can be positioned at the first coating below basic material reaction and can not damage relevant surface.The shape of the profile of sieve also keeps not being damaged.Chemical solution can comprise for example chemical preparations, as for example aminocarboxylic acid, sulfonic acid, sodium carbonate and salt of wormwood.The coating that contains low-phosphorous chemical nickel is compared with the chemical nickel of high phosphorus, can by matting, remove more quickly.Coming off of coating can be by electric current and/or by coating inject high pressure water is accelerated.The middle use high pressure water that comes off of hard metallic coating be difficulty and be impossible in some cases.By electric current-intensified chemical dissolution process, for the chemical nickel of high phosphorus, be favourable.In order to accelerate coming off of the first coating, can use for example electrochemical method, basket holds liquid bath as negative electrode as anode therein.The size of the electric current of identical orientation can be about 20A/sqft～21mA/cm2.The preheating of parts is also needed for soluble chemistry nickel coating.Preheating is particularly applicable to for dissolving the chemical nickel coating of high phosphorus.After decoating, can implement for the first and second coating stages, to manufacture new two coatings.

Can only remove the second coating, for example by high pressure cleaning, particularly due to the second coating reason more crisp than the first coating.

In Fig. 6, with the cross section of seeing from sieve wire ends, illustrate according to a kind of structure of sieve wire 22 of two coatings of embodiment.Sieve first surface 12 wiry that is the wire surface on the inlet flow S side of fibrous material, and the first side 14 wiry and the second side 16, by the first coating 24, apply, that is with chemical nickel (EN).Nickel coating 24 extends until support bar or support ring are firmly welded with forming metal silk on this support bar or support ring on

side

14,16 wiry.The first coating of wall body length can extend until point with alphabetical L, mark in the drawings.Also be that coating can only be arranged in sieve aperture mouth on the length-specific on

sieve side

14,16 wiry, as for example in the sieve seam 3 of inlet flow one side of compass screen surface.Chemical nickel coating forms the coating 24 of uniform thickness substantially.The size in the gap 3 between each wire can regulate by chemical nickel coating.On nickel coating, by the hard metallic coating of thermospray, form the second coating 26.Hard metallic coating forms on first surface 12 wiry.Coating in spraying is compared with hard chrome coating has obviously more uniform thickness.

In Fig. 7, with the cross section of seeing from sieve wire ends, illustrate according to a kind of structure of sieve wire 22 of two coatings of embodiment.Sieve first surface 12 wiry that is the wire surface in the inlet flow S of fibrous material mono-side, and the first side 14 wiry and the second side 16, by the first coating 24, apply, that is with chemical nickel (EN).Nickel coating can extend until the some L of wall body length on each

side

14,16 wiry.Chemical nickel coating forms the coating 24 of uniform thickness substantially.On nickel coating, by electrochemistry hard chrome plating, form the second coating, hard chrome coating 28.Due to chrome-plating process, coating 28 from thickness say be uneven and chromiumcoating can be not on

side

14,16 wiry that is the surface wiry arranged side by side that forms gap form.

In Fig. 8, with the cross section of seeing from sieve wire ends, illustrate according to a kind of structure of sieve wire 22 of two coatings of embodiment.Sieve first surface 12 wiry that is wire on the surface of the inlet flow S of fibrous material mono-side, with electrolytic nickel 30, apply, electrolytic nickel forms the first coating.Due to Ni-Speed, coating 30 is heterogeneous with regard to thickness.Nickel coating can not form on

side

14,16 wiry yet.Hard metallic coating 26 by thermospray uniform thickness on nickel coating forms the second coating 26.Hard metallic coating is also only positioned on sieve first surface 12 wiry.

In Fig. 9, with the cross section of seeing from sieve wire ends, illustrate according to a kind of structure of sieve wire 22 of two coatings of embodiment.Sieve first surface 12 wiry that is wire on the surface of the inlet flow S of fibrous material mono-side, with electrolytic nickel 30, apply, electrolytic nickel forms the first coating.Due to Ni-Speed, coating 30 is heterogeneous with regard to thickness and nickel coating can not form on

side

14,16 wiry.On nickel coating, by electrochemistry hard chrome plating, form the second coating that is hard chrome coating 28.Hard chrome coating 28 is also only positioned on sieve first surface 12 wiry and due to chrome-plating method but heterogeneous.

Two coatings are particularly suitable for the coating wiry to basket.But in the two coatings shown in Fig. 6 to Fig. 9, also can on the surface 18 at the orifice plate 6 of hole sizer basket, make, this surface is present in basket structure and is easy to wear thus in inlet flow one side of fibrous material.When coating is carried out in hole, note quick and heterogeneous the dwindling of possibility of the surface volume of the open surfaces in hole during carrying out coating.

By according to of the present utility model pair of coating, the first coating forms by chemical nickel plating and the second coating is the hard metallic coating in thermospray therein, can reach and for example by traditional individual layer hard chrome coating, compare longer coating life.In addition, the wear resistance of the hard metallic coating of thermospray is better than the wear resistance of traditional hard chrome coating.Hard metallic coating by thermospray (HVAF) reaches larger coat-thickness, and can in coating, not form crackle.The thickness of the HVAF coating of thermospray can be for example 200 to 500 μ m, and the thickness of the HVOF coating of thermospray is limited to below 250 μ m, and this forms owing to crackle.By two coatings, also can improve the tack of hard metallic coating on parts surface, that is chemical nickel coating can improve the tack of hard metallic coating, and need not for example by hacking, process the surface for the treatment of coating.

According to a kind of embodiment, whole basket carries out coating in such a way:, make not only on the compass screen surface 2 of input side S but also in

sieve seam

3,8, at least to exist the first coating that contains chemical nickel.By the method, can obtain the coating of even thickness.Above-mentioned situation has significantly reduced the wearing and tearing of sieve seam, that is the form and dimensional precision that sieves profile wiry and sieve seam is maintained.Can reach thus the longer life-span of basket.This coating process does not cause poisonous rubbish yet.

As mentioned above, two coatings also can consist of chemical nickel coating (EN) and the hard metallic coating electrochemically forming thereon, form thus the second coating.Selectively, two coatings also can consist of the nickel coating (the first coating) of electrolytic deposition that is the hard metallic coating in thermospray thereon or the hard chrome coating (the second coating) electrochemically forming.The hard chrome plating of chemical nickel coating can for example be implemented by activate EN coating by electric mode in chromium plating bath, and mode is: the position that exchanged negative electrode and anode before actual hard chrome plating.In hard chrome plating, the thickness of EN coating can be for example approximately 30 μ m.The two coatings that consist of chemical nickel the first coating, can realize the wearing and tearing that reduce the clearance distance on basket and the life-span that extends basket.In addition can keep better shape and the dimensional precision of clearance distance.

The utility model is not limited to above-mentioned embodiment, but should the utility model be applied to wider scope in the scope of inventive concept of the present utility model.

Claims

1. the basket for the treatment of fibrous material (1), wherein, this basket has compass screen surface (2) and on input side, has sieve aperture mouth (3 in a side of the inlet flow (S) of fibrous material, 8), described sieve aperture mouth is provided for a part for the fibrous material of the input side at described basket (S) input to be directed to the receiver side (AK) of basket

It is characterized in that,

Described compass screen surface (2) and described sieve aperture mouth (3,8) at least a portion of wall body length is coated with the first coating (24) on described input side, this first coating comprises chemical nickel, and at least a portion is placed in compass screen surface on described input side, that be coated with described the first coating (24) and is also coated with the second coating being comprised of hard chrome coating (28) or the hard metallic coating (26) that contains carbide.

2. basket according to claim 1,

It is characterized in that,

The thickness of described the first coating (24) is 5 to 80 μ m.

3. basket according to claim 1,

It is characterized in that,

The thickness of described the first coating (24) is 10 to 60 μ m.

4. basket according to claim 1,

It is characterized in that,

The thickness of described the first coating (24) is 10 to 40 μ m.

5. basket according to claim 1,

It is characterized in that,

The thickness of described the second coating (26,28) is 50 to 500 μ m.

6. according to the basket described in any one in claim 1 to 5,

It is characterized in that,

The two coatings of described the first coating and described the second coating formation, in this pair of coating, the thickness of described the first coating (24) shared relative share on the thickness of this pair of coating is less than the thickness of described the second coating (26,28).

7. according to the basket described in any one in claim 1 to 5,

It is characterized in that,

The diameter of described sieve aperture mouth (3,8) at least consists of the thickness of described the first coating (24) at least in part from the direction of described input side (S).

8. basket according to claim 7,

It is characterized in that,

The diameter of described sieve aperture mouth is 0.1 to 15mm.

9. basket according to claim 7,

It is characterized in that,

The diameter of described sieve aperture mouth is 0.1 to 0.8mm.

10. according to the basket described in any one in claim 1 to 5,

It is characterized in that,

Described the first coating is chemical nickel, and this chemical nickel comprises 1% to 14% phosphorus or 1% to 6% boron.

11. according to the basket described in any one in claim 1 to 5,

It is characterized in that,

Described the second coating is the hard metallic coating (26) that contains carbide, and this hard metallic coating is upper in the upper coating forming by thermospray of described the first coating (24) at sieve plate (2).

12. baskets according to claim 11,

It is characterized in that,

The described hard metallic coating (26) that contains carbide is the coating that comprises tungsten carbide particle and/or chromium carbide particle.

13. baskets according to claim 12,

It is characterized in that,

The described hard metallic coating that contains wolfram varbide is the coating of one of following metal alloy: WC-10Co-4Cr, Cr from chemical composition ₃c ₂-25NiCr, WC-20Cr ₃c ₂-7Ni or Cr ₃c ₂-37WC-18.