CN111532792B - High temperature resistant type closes fan - Google Patents
High temperature resistant type closes fan Download PDFInfo
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- CN111532792B CN111532792B CN202010294997.1A CN202010294997A CN111532792B CN 111532792 B CN111532792 B CN 111532792B CN 202010294997 A CN202010294997 A CN 202010294997A CN 111532792 B CN111532792 B CN 111532792B
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- blade
- shell
- laser cladding
- axial direction
- high temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
Abstract
The invention discloses a high-temperature resistant type air shutter, which comprises: the inner ring wall of the shell is provided with a plurality of guide grooves perpendicular to the axial direction at intervals along the axial direction, and the two sides of the shell are respectively provided with an inlet and an outlet communicated with the interior of the shell; the rotating shaft is rotatably arranged in the shell in an penetrating mode along the axial direction, a plurality of blades in the axial direction of the rotating shaft are arranged around the rotating shaft at intervals, one side, facing the inner wall of the shell, of each blade is provided with a convex tooth in guiding fit with the corresponding guide groove, and a sealing pair is formed between each blade and the inner wall of the shell; the surface of the blade is coated with a Ni60-WC laser cladding coating, and Ni60: WC in the Ni60-WC laser cladding coating is 9:1 (mass ratio). The air-closing machine can greatly improve the sealing performance of the air-closing machine, and can obtain better sealing effect at high temperature; the Ni60-WC laser cladding coating is formed on the surface of the blade of the air shutter through laser cladding, so that the wear resistance and the heat resistance of the blade are better improved.
Description
Technical Field
The invention belongs to the technical field of light fans, and particularly relates to a high-temperature-resistant type air shutter fan.
Background
The air-shutting machine is classified into three types, namely a common type, a pressure-resistant type and a high-temperature-resistant type, is important equipment in a pneumatic conveying and ventilating dust removal network, and has the main function of continuously and timely discharging materials in a discharger or a dust remover and simultaneously ensuring that the pressure in the equipment is not exposed to a normal-pressure environment. The air seal machinery is widely applied to pneumatic transportation of equipment in the industries of rice milling, powder making, feed, machinery, chemical engineering, medicine, tobacco, metallurgy, cement, dust removal and the like and unloading in a pipe network pressure state. When the air-blocking machine is used in a high-temperature state, for example, in the production of the expanded precipitated material, the temperature of the expanded material after being demoulded can reach 150 ℃, the moisture content reaches 30%, the material characteristics show high temperature and high humidity, and the characteristics are completely different from those of conventional powder. For example, the temperature of some materials is as high as 600 ℃ when the materials are just manufactured, and under the production condition, the problems of material blockage or serious air leakage, large air leakage and the like caused by blade deformation can occur in the actual use of the conventional air-shutting machine. The air shutter blades and the air shutter shell are generally made of carbon structural steel materials, deformation, corner collapse and abrasion are inevitable in high-temperature occasions, oxides are generated on the surface of the carbon structural steel to cause pitting corrosion, and the failure modes can cause the surface rate of the steel to fail first or even break suddenly and the like. Therefore, the necessary surface strengthening measures for the carbon steel can improve the high temperature resistance and the wear resistance of the steel surface, can also greatly reduce the production cost of enterprises and obtain good economic benefit.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the invention provides the high-temperature-resistant type air shutter which can not influence the sealing property or cause the blocking phenomenon due to the high-temperature expansion and even deformation of the blades at higher temperature.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high temperature resistant type air shutter, comprising:
the inner ring wall of the shell is provided with a plurality of guide grooves perpendicular to the axial direction at intervals along the axial direction, and the two sides of the shell are respectively provided with an inlet and an outlet communicated with the interior of the shell;
the rotating shaft is rotatably arranged in the shell in an axial direction in a penetrating mode, a plurality of blades in the axial direction of the rotating shaft are arranged around the rotating shaft at intervals, and one side, facing the inner wall of the shell, of each blade is provided with a convex tooth in guiding fit with the corresponding guide groove; the surface of the blade is coated with a Ni60-WC laser cladding coating, and Ni60: WC (9 +/-0.5: 1) in the Ni60-WC laser cladding coating is in a mass ratio.
Further, the Ni60-WC laser cladding coating is obtained by the following method:
Mixing Ni60 and WC in a mass ratio of 9:1, and ball-milling the mixed powder in a ball mill for at least 2 hours to obtain composite powder;
step 2, powder preparation
Taking out and drying the ball-milled composite powder in the step 1, fully mixing the mixed powder by using a polyvinyl alcohol organic adhesive with the mass concentration of 3% to form a paste, uniformly coating the paste on the surface-pretreated blade, flattening the surface of the blade with the thickness of a preset layer of 0.9-1mm, and drying the blade for later use;
The dried blade is placed on a platform of a laser, the technological parameters of the laser are set to be 1.6KW, the scanning speed is 420mm/min, and the defocusing amount is as follows: 55mm, protective gas flow: 8 L.h < -1 >, and finally preparing a Ni60-WC laser cladding coating on the surface of the blade.
The installing port has been seted up respectively at the both ends of casing, and the outer fringe of installing port is equipped with annular boss around circumference, and installing port department is equipped with the bearing frame, the bearing frame passes through annular boss installation, the both ends of pivot are passed through the bearing and are rotated and install on the bearing frame, and the pivot is coaxial with the casing.
Furthermore, in order to facilitate the replacement of the blades in the disassembly and assembly process, a plurality of dovetail grooves are formed in the outer wall of the rotating shaft at intervals along the circumferential direction, the blades can enter the interior of the casing through mounting ports at two ends of the casing and are clamped on the rotating shaft through the dovetail grooves.
Compared with the prior art, the invention has the following technical effects: the edge of the air-lock valve blade is provided with the convex teeth, and the inner wall of the air-lock valve shell is provided with the guide groove matched with the convex teeth of the blade, so that the air-lock valve blade can be fixed at a certain position to rotate by the guide groove when rotating, the sealing performance of the air-lock valve can be greatly improved by the design, and a better sealing effect can be obtained at high temperature; the Ni60-WC laser cladding coating is formed on the surface of the blade of the air shutter through laser cladding, so that the wear resistance and the heat resistance of the blade are better improved.
Drawings
Fig. 1 is a schematic structural diagram of a ventilation closing machine in the embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a casing of a ventilation device in an embodiment of the invention.
Fig. 3 is a top view of fig. 2.
FIG. 4 is an illustration of the assembly of the shutter blades and shaft in an embodiment of the present invention.
Fig. 5 is a right side view of fig. 4.
FIG. 6 is a wear curve of a Ni60-WC laser cladding coating of Ni60: WC 9:1 formed on the surface of a vane in an embodiment of the present invention after high temperature frictional wear;
fig. 7 is a wear curve of a Ni60-WC laser cladding coating of Ni60: WC 4:1 formed on the surface of a blade after high temperature frictional wear in an embodiment of the present invention.
Fig. 8 is a wear curve of a Ni60-WC laser cladding coating of Ni60: WC 7:3 formed on the surface of a blade after high temperature frictional wear in an embodiment of the present invention.
Fig. 9 is an electron micrograph of Ni60-WC laser cladding coating of Ni60: WC 9:1 formed on the surface of a vane before and after high temperature frictional wear at 50 × magnification in an example of the present invention, where a is before wear and b is after wear.
Fig. 10 is an electron micrograph of Ni60-WC laser cladding coating of Ni60: WC 4:1 formed on the surface of a vane before and after high temperature frictional wear at 50 × magnification in an example of the present invention, where a is before wear and b is after wear.
Fig. 11 is an electron micrograph of Ni60-WC laser cladding coating of Ni60: WC 7:3 formed on the surface of a vane before and after high temperature frictional wear at 50 × magnification in an example of the present invention, where a is before wear and b is after wear.
The reference numbers in the figures are: 1. the device comprises a shell, 2 parts of guide grooves, 3 parts of inlets, 4 parts of outlets, 5 parts of rotating shafts, 6 parts of blades and 7 parts of convex teeth.
Detailed Description
The invention is described in more detail below with reference to the following examples:
a high temperature resistant type air shutter of the present embodiment, as shown in fig. 1 to 4, comprises a casing 1 and a rotating shaft 5,
the inner ring wall of the machine shell 1 is provided with a plurality of guide grooves 2 perpendicular to the axial direction at intervals along the axial direction, and the two sides of the machine shell 1 are respectively provided with an inlet 3 and an outlet 4 communicated with the inside of the machine shell 1. The rotating shaft 5 is rotatably arranged in the machine shell 1 along the axial direction, a plurality of blades 6 along the axial direction of the rotating shaft 5 are arranged around the rotating shaft 5 at intervals, and one side of each blade 6, which faces the inner wall of the machine shell 1, is provided with a convex tooth 7 in guiding fit with the guide groove 2; the surface of the blade 6 is coated with a Ni60-WC laser cladding coating, wherein the mass ratio of Ni60 to WC is 9:1, Ni60 to WC is 4:1, and Ni60 to WC is 7:3 in the Ni60-WC laser cladding coating.
Specifically, the installing port has been seted up respectively at the both ends of casing 1, and the outer fringe of installing port is equipped with annular boss around circumference, and installing port department is equipped with the bearing frame, and the bearing frame passes through annular boss installation, and the bearing rotation is installed on the bearing frame at the both ends of pivot 5, and pivot 5 is coaxial with the casing.
The outer wall of pivot 5 is equipped with a plurality of dovetail along axial direction around circumference interval, and blade 6 can get into the casing through the installing port at casing both ends inside and clamp on pivot 5 through the dovetail (also, for the convenience of blade installation, the blade is kept away from the distance between one side of installation axle and the pivot center pin and is less than or equal to the radius of installing port), and the material of 6 base members of blade and casing 1 is the Q235 steel.
The examples of forming the Ni60-WC laser cladding coating on the surface of the blade 6 are as follows:
example 1
1) Surface pretreatment of the blade 6:
and (3) polishing the surface of the blade 6 by using a 180# grinding wheel, polishing again by using metallographic abrasive paper to obtain a smooth and flat surface, cleaning by using alcohol, and drying in a vacuum drying oven for later use.
2) Preparing laser cladding powder
The powders were mixed according to the percentage Ni60: WC 9:1 and ball milled in a ball mill for 2 hours.
3) Pre-arranged powder
And taking out the mixed composite powder, drying, fully mixing the mixed powder with a polyvinyl alcohol organic adhesive with the mass concentration of 3 wt.% to form paste, uniformly coating the paste on the surface of the treated blade 6, flattening the surface of the treated blade, and finally drying the treated blade in a drying oven for later use, wherein the thickness of the preset layer is 0.9-1 mm.
4) Laser cladding preparation of Ni60+ WC composite coating
The processed blade 6 is placed on a platform of a laser, the technological parameters of the laser are set to be 1.6KW, the scanning speed is 420mm/min, and the defocusing amount is as follows: 55mm, protective gas flow: 8 L.h-1Finally, preparing the percentage Ni60: laser cladding coating of WC 9: 1.
5) The HT-1000 type screen display type high-temperature friction and wear testing machine is used, a ball disc friction pair is adopted, and an upper sample adopts SiO2A lower sample of the friction ball is a Ni60/WC composite coating sample; by coefficient of frictionAs an index of frictional wear performance, the coefficient of friction value was directly read by a testing machine.
6) Observing the surface of the cladding layer of the sample block under a 50-time electron microscope
7) Measuring flatness of a surface using a CMM
8) The composite cladding layer has fewer cracks and compact structure, the thickness of the coating is 0.4-0.6mm, the friction coefficient is stabilized to about 0.2 through a high-temperature friction and wear test, the worn surface has only shallow scratches, and the flatness variation is 0.002 mm.
Example 21) surface preparation of the blade 6:
and (3) polishing the surface of the blade 6 by using a 180# grinding wheel, polishing again by using metallographic abrasive paper to obtain a smooth and flat surface, cleaning by using alcohol, and drying in a vacuum drying oven for later use.
2) Preparing laser cladding powder
The powders were mixed according to the percentage Ni60: WC 4:1 and ball milled in a ball mill for 2 hours.
3) Pre-arranged powder
And taking out the mixed composite powder, drying, fully mixing the mixed powder with 3 wt.% polyvinyl alcohol organic adhesive to form paste, uniformly coating the paste on the surface of the treated Q235 steel, flattening the surface, and finally drying in a drying oven for later use, wherein the thickness of the preset layer is 0.9-1 mm.
4) Laser cladding preparation of Ni60+ WC composite coating
The processed blade 6 is placed on a platform of a laser, the technological parameters of the laser are set to be 1.6KW, the scanning speed is 400mm/min, and the defocusing amount is as follows: 55mm, protective gas flow: 8 L.h-1Finally, preparing the percentage Ni60: 4:1 WC.
5) The HT-1000 type screen display type high-temperature friction and wear testing machine is used, a ball disc friction pair is adopted, and an upper sample adopts SiO2A lower sample of the friction ball is a Ni60/WC composite coating sample; the friction coefficient is used as the friction and wear performance index, and the friction coefficient value is directly read by a testing machine.
6) Observing the surface of the cladding layer of the sample block under a 50-time electron microscope
7) Measuring flatness of a surface using a CMM
8) The composite cladding layer is measured to have visible pits, the thickness of the coating is 0.4-0.6mm, the final friction coefficient is stabilized at about 0.3 through a high-temperature friction and wear test, and the worn surface has visible cracks, pits, white spots and the change amount of the flatness is 0.005 mm.
Example 3
1) Surface pretreatment of the blade 6:
and (3) polishing the surface of the blade 6 by using a 180# grinding wheel, polishing again by using metallographic abrasive paper to obtain a smooth and flat surface, cleaning by using alcohol, and drying in a vacuum drying oven for later use.
2) Preparing laser cladding powder
Mixing the components according to the percentage of Ni60: WC: 7:3, and ball-milling the mixed powder in a ball mill for 2 hours.
3) Pre-arranged powder
Taking out the mixed composite powder, drying, fully mixing the mixed powder with 3 wt.% polyvinyl alcohol organic adhesive to form paste, uniformly coating the paste on the surface of the treated blade 6, flattening the surface, and finally drying in a drying oven for later use, wherein the thickness of the preset layer is 0.9-1 mm.
4) Laser cladding preparation of Ni60+ WC composite coating
The processed blade 6 is placed on a platform of a laser, the technological parameters of the laser are set to be 1.2KW, the scanning speed is 300mm/min, and the defocusing amount is as follows: 55mm, protective gas flow: 8 L.h-1Finally, preparing the percentage Ni60: laser cladding coating of WC 7: 3.
5) The HT-1000 type screen display type high-temperature friction and wear testing machine is used, a ball disc friction pair is adopted, and an upper sample adopts SiO2A lower sample of the friction ball is a Ni60/WC composite coating sample; the friction coefficient is used as the friction and wear performance index, and the friction coefficient value is directly read by a testing machine.
6) Observing the surface of the cladding layer of the sample block under a 50-time electron microscope
7) Measuring flatness of a surface using a CMM
8) The composite cladding layer is tested to have more scratches and spots, the thickness of the coating is 0.4-0.6mm, the final friction coefficient is stabilized between 0.3-0.4 through a high-temperature friction and wear test, the surface friction trace after wear is serious, and the variation of the flatness is 0.007 mm.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (4)
1. The utility model provides a fan is closed to high temperature resistant type which characterized in that: the method comprises the following steps:
the inner ring wall of the shell (1) is provided with a plurality of guide grooves (2) perpendicular to the axial direction at intervals along the axial direction, and two sides of the shell (1) are respectively provided with an inlet (3) and an outlet (4) communicated with the interior of the shell (1);
the rotating shaft (5) is rotatably arranged in the shell (1) in a penetrating mode along the axial direction, a plurality of blades (6) along the axial direction of the rotating shaft (5) are arranged around the rotating shaft (5) at intervals, and one side, facing the inner wall of the shell (1), of each blade (6) is provided with a convex tooth (7) matched with the guide groove (2) in a guiding mode; the surface of the blade (6) is coated with a Ni60-WC laser cladding coating, and the mass ratio of Ni60 to WC in the Ni60-WC laser cladding coating is (9 +/-0.5): 1.
2. The high temperature resistant type air shutter according to claim 1, characterized in that: the Ni60-WC laser cladding coating is obtained by the following method:
step 1, preparing laser cladding powder,
mixing the materials according to the mass ratio of Ni60: WC =9:1, and ball-milling the mixed powder in a ball mill for at least 2 hours to obtain composite powder;
step 2, pre-placing the powder,
taking out and drying the ball-milled composite powder in the step 1, fully mixing the mixed powder by using a polyvinyl alcohol organic adhesive with the mass concentration of 3% to form a paste, uniformly coating the paste on a blade (6) subjected to surface pretreatment, flattening the surface and drying the preset layer with the thickness of 0.9-1mm for later use;
step 3, preparing a Ni60-WC laser cladding coating by laser cladding, placing the dried blade (6) on a platform of a laser, setting the technological parameters of the laser to be 1.6KW, the scanning speed to be 420mm/min, and the defocusing amount to be: 55mm, protective gas flow: 8 L.h-1Finally, preparing a Ni60-WC laser cladding coating on the surface of the blade (6).
3. The high temperature resistant type air shutter according to claim 1, characterized in that: the mounting hole has been seted up respectively at the both ends of casing (1), and the outer fringe of mounting hole is equipped with annular boss around circumference, and mounting hole department is equipped with the bearing frame, the bearing frame passes through annular boss installation, the both ends of pivot (5) are passed through the bearing and are rotated and install on the bearing frame, and pivot (5) are coaxial with the casing.
4. The high temperature resistant type air shutter according to claim 3, characterized in that: the outer wall of pivot (5) is seted up a plurality of dovetail along axial direction around the circumference interval, blade (6) can get into the casing inside and clamp on pivot (5) through the dovetail via the installing port at casing both ends.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010294997.1A CN111532792B (en) | 2020-04-15 | 2020-04-15 | High temperature resistant type closes fan |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010294997.1A CN111532792B (en) | 2020-04-15 | 2020-04-15 | High temperature resistant type closes fan |
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| CN111532792B true CN111532792B (en) | 2022-03-01 |
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Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476534Y (en) * | 2000-09-28 | 2002-02-13 | 刘德昌 | Air seal machinery for fibre material |
| CN2470588Y (en) * | 2001-03-15 | 2002-01-09 | 王英娟 | Long-life, wear-resisting, high-temp.-resisting blade of fan |
| CN201264812Y (en) * | 2008-08-05 | 2009-07-01 | 天津菲斯特机械设备有限公司 | High temperature airlock valve |
| CN202118125U (en) * | 2011-06-17 | 2012-01-18 | 广州机械科学研究院 | Sealing structure for bearing end surface convenient to detach and install |
| WO2013005384A1 (en) * | 2011-07-01 | 2013-01-10 | センコー株式会社 | Rotary valve, and dense-phase conveying system for powder and granular materials |
| CN202170816U (en) * | 2011-07-09 | 2012-03-21 | 潍坊雷诺特动力设备有限公司 | Steam sealing system of steam power device |
| CN102537367B (en) * | 2012-01-12 | 2014-12-03 | 北京理工大学 | Shaft sealing device with magnetic fluids |
| CN103863770A (en) * | 2012-12-13 | 2014-06-18 | 哈尔滨弘泰电力设备有限公司 | Triangular rotor |
| CN204751505U (en) * | 2015-05-19 | 2015-11-11 | 麻城凯龙科技化工有限公司 | Fan closes |
| CN105624670B (en) * | 2016-03-17 | 2018-05-08 | 中国人民解放军理工大学野战工程学院 | Aluminium alloy element surface abrasion resistance antifriction composite coating and preparation method thereof |
| CN106757010B (en) * | 2017-01-17 | 2020-01-03 | 江苏理工学院 | Preparation method of fiber laser cladding nickel-based nickel-coated tungsten carbide cladding coating |
| CN207158165U (en) * | 2017-07-31 | 2018-03-30 | 宝武集团环境资源科技有限公司 | A kind of deduster star-shaped dust-discharging valve device |
| CN209100093U (en) * | 2018-09-05 | 2019-07-12 | 沈阳鹰缘科技有限公司 | A kind of novel axle envelope |
| CN210048035U (en) * | 2019-05-20 | 2020-02-11 | 四川自立机械有限公司 | Backplate formula air shutter |
| CN210176017U (en) * | 2019-05-24 | 2020-03-24 | 东源辉科建材发展有限公司 | Discharging fan |
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