CN114834834A - Blade comprising diamond wear-resistant layer, preparation method of blade and spiral conveyor - Google Patents
Blade comprising diamond wear-resistant layer, preparation method of blade and spiral conveyor Download PDFInfo
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- CN114834834A CN114834834A CN202210313250.5A CN202210313250A CN114834834A CN 114834834 A CN114834834 A CN 114834834A CN 202210313250 A CN202210313250 A CN 202210313250A CN 114834834 A CN114834834 A CN 114834834A
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Images
Classifications
-
- 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
- B65G33/00—Screw or rotary spiral conveyors
- B65G33/24—Details
- B65G33/26—Screws
- B65G33/265—Screws with a continuous helical surface
-
- 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
- B65G33/00—Screw or rotary spiral conveyors
- B65G33/24—Details
- B65G33/26—Screws
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention provides a blade comprising a diamond wear-resistant layer, a preparation method thereof and a screw conveyor; wherein, the blade is spirally arranged on the auger conveying rod body; the surface of the blade is provided with a diamond wear-resistant layer, and the diamond wear-resistant layer comprises a first wear-resistant layer and a second wear-resistant layer; the blade comprises a material receiving surface and a periphery; the first wear-resistant layer is arranged on the material facing surface; the second wear-resistant layer is arranged on the periphery. The diamond coating is arranged on the surface of the blade, so that the problem of abrasion of the blade in the using process is effectively solved, and the abrasion resistance of the blade is improved.
Description
Technical Field
The invention relates to the technical field of screw conveyors, in particular to a blade comprising a diamond wear-resistant layer, a preparation method of the blade and a screw conveyor.
Background
The screw conveyer is a kind of conveyer widely used in grain industry, building material industry, chemical industry, mechanical manufacturing industry, transportation industry and other national economic departments, and is mainly used for horizontal conveying and vertical lifting of various powdery, granular and small block-shaped loose materials. When the screw shaft rotates, the materials are conveyed forwards under the pushing of the blades due to the gravity of the materials and the friction force generated between the materials and the shell of the screw conveyor.
During the operation of the screw conveyor, the blades are continuously rubbed with materials to generate abrasion, so that the service life of the blades is shortened; when the abrasion is serious, the whole conveyor shakes seriously even because of the abrasion of the blades, parts are scrapped, the working efficiency is seriously influenced, and the maintenance cost is increased.
Disclosure of Invention
In order to solve the problems, the invention provides a blade comprising a diamond wear-resistant layer, wherein the blade is spirally arranged on a packing auger conveying rod body; the surface of the blade is provided with a diamond wear-resistant layer, and the diamond wear-resistant layer comprises a first wear-resistant layer and a second wear-resistant layer; the blade comprises a material receiving surface and a periphery; the first wear-resistant layer is arranged on the material facing surface; the second wear-resistant layer is arranged on the periphery.
In the diamond wear-resistant layer adopted by the embodiment, diamond is used as superhard particles, so that the diamond wear-resistant layer has extremely high hardness, excellent wear resistance and better heat conductivity, the diamond wear-resistant layer is high in bonding strength and good in formability, and the wear resistance of the blade can be greatly improved; on the other hand, through the concrete position of reasonable setting diamond wearing layer, protected the easy impaired position of blade, also can practice thrift diamond wearing layer's material simultaneously, realize low-cost efficient effect.
Furthermore, the blade also comprises a back surface, and the back surface and the material receiving surface are two opposite surfaces; the diamond wear-resistant layer also comprises a third wear-resistant layer; the third wear-resistant layer is arranged on the back surface.
In this embodiment, the back surface of the blade is provided with a third wear-resistant layer, and considering that the third wear-resistant layer is not deeply worn by the material, the thickness of the third wear-resistant layer is small, and generally does not exceed 0.5 mm, and the preferred thickness is 0.4 mm.
Further, the thickness of the first wear-resistant layer is gradually reduced along the direction close to the conveying rod body.
In this embodiment, the circumferential position of the vane is more easily worn due to the excessive linear velocity during rotation, so that the thickness of the first wear-resistant layer near the vane circumference is the largest, so that the vane is more favorably protected. Along the direction close to the conveying rod body, the easily damaged degree of the blades is continuously reduced, so that the thickness of the first wear-resistant layer is also continuously reduced, and different parts of the blades can be favorably protected; meanwhile, the consumption of raw materials of the first wear-resistant layer can be reduced, so that the production cost is reduced. On the other hand, the height difference between the first wear-resistant layer and the blade can be very small due to the reduction of the thickness of the first wear-resistant layer, and the resistance of material transportation is effectively reduced.
Further, the thickness of the diamond wear-resistant layer is 0.2 mm-5 mm.
In the present embodiment, the thickness of the diamond wear-resistant layer is preferably 0.2 mm to 5 mm in consideration of the cost and the wear-resistant effect of the diamond wear-resistant layer, for example, in one specific embodiment, the thickness of the second wear-resistant layer is 5 mm, and the thickness of the first wear-resistant layer is gradually reduced along the direction close to the conveying rod body, wherein the thickness close to the conveying rod body is 5 mm, and the thickness far from the conveying rod body is 0.2 mm.
Further, the diamond wearing layer interval sets up a plurality of expansion joints, and the direction that the expansion joint set up is the direction of the outer fringe pointing to conveying pole body axis of diamond wearing layer.
In this embodiment, through setting up the dilatation joint, effectively reduced the thermal stress that the in-process of diamond wearing layer preparation produced to avoid the coating fracture, further guaranteed diamond wearing layer's wear resistance.
Furthermore, one end of each expansion joint, which is far away from the conveying rod body, is a first end, and the length of a circular arc between the first ends of any two expansion joints is 2-15 cm; and/or the width of the expansion gap is 0.2 mm-1 mm.
In the embodiment, the expansion gap is provided for protecting the bonding strength of the diamond wear-resistant layer and avoiding cracking, but cannot affect the wear-resistant performance, so that the expansion gap is not too wide, and preferably, the width of the expansion gap is 0.2 mm-1 mm. In another aspect, the arc length between the first ends of any two expansion joints is preferably 2 cm to 15 cm.
Further, the diamond wear-resistant coating comprises the following raw materials in parts by mass: 1-30 parts of diamond micro powder; 0-60 parts of hard particles; 40-90 parts of solder alloy powder; 5-20 parts of a binder.
In this embodiment, the diamond micro powder and the hard particles serve as main hard phases and have a wear-resistant effect, the brazing alloy powder needs to wet the diamond and the substrate to form metallurgical bonding, the wear resistance needs to be considered, the brazing alloy powder is matched with the wear-resistant performance of the hard particles, the brazing filler metal and the hard particles are bonded on the surface of the substrate through the binder, and the bonding strength between materials is improved.
Further, the diamond micro powder comprises at least one of non-coated diamond micro powder and metal-coated diamond micro powder; and/or the hard particles comprise at least one of tungsten carbide, boron carbide, silicon carbide, boron nitride, silicon nitride; and/or the braze alloy powder comprises nickel-based alloy braze powder; and/or the binder comprises an aqueous solution of at least one of hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, ethyl cellulose, sodium carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose; the mass fraction of solute in the aqueous solution is 0.5-1.5%.
In the embodiment, the diamond particles are used as the hardest material to greatly improve the wear resistance of the blade, the hard particles are selected from tungsten carbide, boron carbide, silicon carbide, boron nitride, silicon nitride and the like, and the wear resistance degree and size of the blade can be smoothly transited by adjusting the proportion of the diamond particles and the hard particles and the thickness of the diamond wear-resistant layer during coating. In one specific embodiment, the blade is prepared by mixing raw materials in proportion, coating the mixture on the surface of the blade to be treated, and performing induction brazing.
Further, a diamond wear layer is brazed to the surface of the blade.
In this embodiment, through scribbling the diamond wearing layer to the surface of blade with the borer, the diamond wearing layer surface that the preparation obtained is level and smooth, the composition is even, the machining precision is high, and bonding strength is high, can effectively solve wearing body among the current technology and drop easily, the poor scheduling problem of bonding force.
The invention also provides a spiral conveyor which comprises the auger conveying rod provided by any one of the embodiments.
The screw conveyor provided in this embodiment includes at least one of the benefits and effects of any of the above embodiments, which is not described herein again.
The invention also provides a preparation method of the blade comprising the diamond wear-resistant layer, the blade comprising the diamond wear-resistant layer is used for the auger conveying rod of any one of the embodiments, and the preparation method of the blade comprising the diamond wear-resistant layer comprises the following steps:
s10: cutting a matched frame plate in advance according to the target shape and the target thickness of the diamond wear-resistant layer;
s20: mixing the raw materials of the diamond wear-resistant layer to prepare a paste material;
s30: fixing the blade to a frame plate, and coating a paste material on the periphery, the material facing surface and the back surface of the blade to obtain the blade to be brazed;
s40: and after the blade to be brazed is dried, carrying out induction brazing in a protective gas environment to obtain the blade comprising the diamond wear-resistant layer.
In this embodiment, in order to realize the interval coating or smooth transition of diamond wearing layer, adopt the mode of prefabricated frame version, the frame version of adaptation is prepared according to the size of required diamond wearing layer, and reserve out the position of corresponding diamond wearing layer, fix the blade to the frame version, adopt modes such as brush dipping in or needle tubing crowded coating to tile the paste material in meeting the material face and periphery, the frame version plays the effect of fixed shape and thickness, when the required thickness of diamond wearing layer is thicker, but layered coating.
After the technical scheme of the invention is adopted, the following technical effects can be achieved:
1. the surface of the blade is coated with a diamond wear-resistant layer by brazing, and diamond is used as reinforcing particles, so that the wear resistance of the coating is greatly improved;
2. the thickness of the diamond wear-resistant layer is smoothly transited according to the easy wear degree of the blade, so that the material conveying resistance is reduced, and the cost is saved;
3. and an expansion gap is arranged to reduce stress.
4. In the brazing process, mechanical vibration such as ultrasound and high-frequency knocking is added, so that the effects of leveling the coating, refining grains, purifying tissues (degassing, deslagging and purifying) and reducing the residual stress of the coating are achieved.
Drawings
Fig. 1 is a schematic structural diagram of an auger conveying rod according to some embodiments of the present invention.
FIG. 2 is a cross-sectional view of the blade of FIG. 1.
Fig. 3 is a schematic structural diagram of an auger conveying rod according to some embodiments of the present invention.
FIG. 4 is a cross-sectional view of the blade of FIG. 3.
Fig. 5 is a schematic structural diagram of an auger conveying rod according to another view angle provided by some embodiments of the present invention.
Fig. 6 is a schematic structural diagram of an auger conveying rod according to some embodiments of the present invention.
Description of reference numerals:
100-auger conveying rod; 10-a conveying rod body; 20-blades; 21-material facing level; 22-peripheral edge; 23-back side; 30-diamond wear layer; 31-a first wear layer; 32-a second wear layer; 33-a third wear layer; 40-expansion gap; 41-a first end; 42-circular arc.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 6, the present invention provides a blade 20 including a diamond wear layer, the blade 20 is spirally disposed on an auger conveying rod body 10; the surface of the blade 20 is provided with a diamond wear-resistant layer 30, and the diamond wear-resistant layer 30 comprises a first wear-resistant layer 31 and a second wear-resistant layer 32; the blade 20 comprises a material facing surface 21 and a periphery 22, and the first wear-resistant layer 31 is arranged on the material facing surface 21; a second wear layer 32 is provided at the periphery 22.
In the working process of the auger conveying rod 100, the linear velocity of the peripheral edge 22 of the blade 20 is higher along with the rotation of the conveying rod body 10, so that the impact between the blade and the material is more violent and the abrasion is more easily generated; to address this problem, the present embodiment provides a diamond wear layer 30 on the surface of the blade 20. The first wear-resistant layer 31 and the second wear-resistant layer 32 are a whole, namely, the diamond wear-resistant layer 30, wraps the periphery 22 of the blade 20 and extends towards the direction of the conveying rod body 10, and the extending length can be adjusted according to actual conditions. Specifically, the extension length is 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 100% of the width of the blade 20.
Further, the blade 20 further comprises a back surface 23, the back surface 23 and the material facing surface 21 are two opposite surfaces, and the diamond wear-resistant layer 30 further comprises a third wear-resistant layer 33; a third wear layer 33 is provided on the back surface 23 of the blade 20.
In some embodiments of the present embodiment, the back surface 23 of the blade 20 is provided with a third wear-resistant layer 33, and considering that the third wear-resistant layer 33 is not deeply worn by the material, the thickness of the third wear-resistant layer 33 is small, generally not more than 0.5 mm, and preferably 0.4 mm. In one embodiment, the third wear resistant layer 33 has a substantially constant thickness and a width extending along the periphery 22 in a direction toward the conveyor bar body 10 and a length that is 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 100% of the width of the blade 20.
In the diamond wear-resistant layer 30 adopted in the embodiment, diamond is used as the superhard particles, and the diamond wear-resistant layer has extremely high hardness, excellent wear resistance and better heat conductivity, and the diamond wear-resistant layer has high bonding strength and good formability, so that the wear resistance of the blade 20 can be greatly improved; on the other hand, through the concrete position of reasonable setting diamond wearing layer 30, protected easy impaired position of blade 20, also can practice thrift diamond wearing layer 30's material simultaneously, realize low-cost efficient effect.
Referring to fig. 2, further, the thickness of the first wear-resistant layer 31 is gradually reduced in a direction approaching the feed bar body 10.
In the present embodiment, in order to reduce the transportation resistance of the material, the first wear-resistant layer 31 and the blade 20 are smoothly transited, and specifically, the thickness of the first wear-resistant layer 31 is gradually reduced along the direction approaching the conveying rod body 10. In one embodiment, second abradable layer 32 is of constant thickness, thereby providing stable protection to peripheral edge 22 of blade 20.
Adopt the technical scheme that this embodiment provided, its beneficial effect lies in: the position of the peripheral edge 22 of the vane 20 is more susceptible to wear due to excessive linear velocity during rotation, and therefore the thickness of the first abradable layer 31 adjacent to the peripheral edge 22 of the vane 20 is maximized, resulting in more advantageous protection of the vane 20. Along the direction close to the conveying rod body 10, the damage degree of the blade 20 is continuously reduced, so that the thickness of the first wear-resistant layer 31 is also continuously reduced, and different parts of the blade 20 can be favorably protected; meanwhile, the consumption of raw materials of the first wear-resistant layer 31 can be reduced, so that the production cost is reduced. On the other hand, the reduction of the thickness of the first wear-resistant layer 31 also enables the height difference between the first wear-resistant layer and the blade 20 to be very small, and effectively reduces the resistance of material transportation.
Further, the diamond wear layer 30 has a thickness of 0.2 mm to 5 mm.
In the present embodiment, the thickness of the diamond wear-resistant layer 30 is preferably 0.2 mm to 5 mm in consideration of the cost and the wear-resistant effect, for example, in one embodiment, the thickness of the second wear-resistant layer 32 is 5 mm, and the thickness of the first wear-resistant layer 31 is gradually reduced along the direction close to the conveying rod body 10, wherein the thickness is 5 mm close to the conveying rod body 10 and 0.2 mm far from the conveying rod body 10.
Referring to fig. 5, further, a plurality of expansion gaps 40 are arranged at intervals on the diamond wear-resistant layer 30, and the direction of the expansion gaps 40 is the direction in which the outer edge of the diamond wear-resistant layer 30 points to the axis of the conveying rod body 10.
In one embodiment, the diamond wear layer 30 is a unitary body, such as shown in fig. 6; however, during the manufacturing process of the blade 20, there may be a case where the diamond wear-resistant layer 30 is cracked due to stress generated by heating, so the expansion gap 40 is provided in the present embodiment to divide the diamond wear-resistant layer 30 into a plurality of layers at intervals. Since the blade 20 is spirally arranged on the conveying rod body 10, the direction of the expansion gap 40 is directed from the outer edge of the diamond wear-resistant layer 30 to the axis of the conveying rod body. In the embodiment, the expansion gap 40 is arranged, so that the thermal stress generated in the preparation process of the diamond wear-resistant layer 30 is effectively reduced, the coating is prevented from cracking, and the wear resistance of the diamond wear-resistant layer 30 is further ensured.
Further, one end of each expansion joint 40, which is far away from the conveying rod body 10, is a first end 41, and the length of an arc 42 between the first ends 41 of any two expansion joints 40 is 2-15 cm; and/or the expansion joint 40 has a joint width of 0.2 mm to 1 mm.
In the present embodiment, the expansion gap 40 is provided to protect the bonding strength of the diamond wear-resistant layer 30 from cracking, but cannot affect the wear-resistant performance thereof, and therefore should not be too wide, and preferably, the expansion gap 40 has a gap width of 0.2 mm to 1 mm, and specifically, may be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. On the other hand, the length of the arc 42 between the first ends 41 of any two expansion joints 40 is preferably 2 cm to 15 cm, and specifically may be 2 cm, 4 cm, 6 cm, 8 cm, 10 cm or 12 cm.
Further, the diamond wear-resistant coating comprises the following raw materials in parts by mass: 1-30 parts of diamond micro powder; 0-60 parts of hard particles; 40-90 parts of solder alloy powder; 5-20 parts of a binder.
In the embodiment, the diamond particles are used as the hardest material to greatly improve the wear resistance of the blade 20, the hard particles are selected from tungsten carbide, boron carbide, silicon carbide, boron nitride, silicon nitride and the like, and the wear resistance degree and size of the blade can be smoothly transited by adjusting the proportion of the diamond particles and the hard particles and the thickness of the diamond wear-resistant layer 30 during coating. In one embodiment, the blade 20 is prepared by proportioning and mixing raw materials, applying the mixture to the surface of the blade 20 to be treated, and induction brazing. Therefore, the raw materials of the diamond wear-resistant coating are granular, and the granularity is as follows:
the particle size of the diamond micropowder includes, for example, 50/60, 80/100, 200/230, 230/270, 270/325, 325/400 mesh and the like; the particle size of the hard particles includes, for example, 50/60, 80/100, 200/230, 230/270, 270/325, 325/400 mesh, and the like; the particle size of the solder alloy powder includes, for example, 100/200, 200/300 mesh, and the like.
Further, the diamond micro powder comprises at least one of non-coated diamond micro powder and metal-coated diamond micro powder; and/or the hard particles comprise at least one of tungsten carbide, boron carbide, silicon carbide, boron nitride, silicon nitride; and/or the braze alloy powder comprises nickel-based alloy braze powder; and/or the binder comprises an aqueous solution of at least one of hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, ethyl cellulose, sodium carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose; the mass fraction of solute in the aqueous solution is 0.5-1.5%.
Further, a diamond wear layer 30 is brazed to the surface of the blade 20.
In the related technology, in order to improve the wear resistance of the blade, a wear-resistant body is generally installed on the blade, the wear-resistant body is usually prefabricated by sintering, casting and other processes, the manufacturing process is complex, the cost of the blade is increased, the self weight of the blade is increased, the wear-resistant body is easy to fall off integrally, and the comprehensive mechanical property and other aspects are difficult to meet the requirements; on the other hand, the wear-resistant metal or alloy coating can be prepared on the surface of the blade through a surface additive technology, but the improvement of the wear resistance is limited, and the problems of easy deformation of a workpiece, uneven components, uneven coating surface, difficult process control, poor coating bonding force and the like are accompanied.
In the embodiment, in order to solve the above problems, the diamond wear-resistant layer 30 is coated on the surface of the blade 20 by brazing, so that the prepared diamond wear-resistant layer 30 has the advantages of smooth surface, uniform components, high processing precision and high bonding strength, and the problems of easy falling off of a wear-resistant body, poor bonding force and the like in the prior art can be effectively solved.
The invention also provides a spiral conveyor which comprises the auger conveying rod 100 provided by any one of the embodiments.
The screw conveyor provided in this embodiment includes at least one of the benefits and effects of any of the above embodiments, which is not described herein again.
The invention also provides a preparation method of the blade comprising the diamond wear-resistant layer, the blade comprising the diamond wear-resistant layer is used for the auger conveying rod of any one of the embodiments, and the preparation method of the blade comprising the diamond wear-resistant layer comprises the following steps:
s10: cutting a matched frame plate in advance according to the target shape and the target thickness of the diamond wear-resistant layer;
s20: mixing the raw materials of the diamond wear-resistant layer to prepare a paste material;
s30: fixing the blade to a frame plate, and coating a paste material on the periphery, the material facing surface and the back surface of the blade to obtain the blade to be brazed;
s40: and after the blade to be brazed is dried, carrying out induction brazing in a protective gas environment to obtain the blade comprising the diamond wear-resistant layer.
In this embodiment, in order to realize interval coating or smooth transition of diamond wearing layer, adopt the mode of prefabricated frame version, the frame version of adaptation is prepared according to the size of required diamond wearing layer, and reserve out the position of corresponding diamond wearing layer, fix the blade to the frame version, adopt modes such as brush dipping in or needle tubing crowded coating to tile the paste material in meeting the material face, back and periphery, the frame version plays the effect of fixed shape and thickness, when the required thickness of diamond wearing layer is thicker, but layered coating. Wherein, the frame plate material comprises stainless steel, nickel, iron, copper, silica gel, rubber and the like. The expansion gap can be correspondingly arranged when the frame plate is prefabricated, and can also be arranged in a groove-opening mode after the paste material is coated on the blade, such as cutting, drilling and milling and the like.
In some embodiments of this embodiment, in the process of performing the induction brazing in step S40, mechanical vibration is added, and the mechanical action, the thermal action, the cavitation action, the acoustic flow action, and the like, which are generated on the medium by the high-frequency vibration and the radiation pressure, achieve the effects of leveling the coating, refining the crystal grains, purifying the structure (degassing, deslagging, purification), and reducing the residual stress of the coating. The mechanical vibration includes ultrasound, high frequency knocking, and the like.
In some embodiments of this embodiment, the protective gas is, for example, argon or nitrogen.
In some embodiments of this embodiment, the mechanical vibration, specifically, additional ultrasonic vibration, high-frequency knocking, etc., is performed while the gas is protected, and the mechanical action, thermal action, cavitation action, acoustic flow action, etc., generated by the high-frequency vibration and radiation pressure on the medium, achieve the effects of leveling the coating, refining grains, purifying the structure, degassing, deslagging, purifying, and reducing the residual stress of the coating.
In some embodiments of this embodiment, the blade is pre-treated prior to application of the paste-like material, the pre-treatment including, for example, sand blasting, shot blasting, sanding, acid washing, etc., to remove surface contaminants such as oil, rust, scale, etc.
Example 2
The embodiment provides a preparation method of a blade comprising a diamond wear-resistant layer, which comprises the following steps:
s00: pre-treating; the surface of the blade is pretreated by sand blasting to remove oil stain, rust, oxide skin and the like on the surface.
S10: cutting an adaptive frame plate in advance according to the target shape and the target thickness of the diamond wear-resistant layer; the diamond wear layer has the following dimensions: the coating thickness of the second wear-resistant layer is 4 mm, and the thickness of the outermost edge of the blade is 4 mm; the maximum position of the thickness of the first wear-resistant layer is 4 mm, and the minimum position of the thickness of the first wear-resistant layer is 0.5 mm; the thickness of the third wear-resistant layer is 0.4 mm, and the stainless steel frame plate is cut according to the size.
S20: mixing the raw materials of the diamond wear-resistant layer to prepare a paste material; weighing 200/230-mesh non-coated diamond micro powder and 200/300-mesh BNi-2 nickel-based brazing filler metal powder in proportion, placing the two powders in a three-dimensional mixer for premixing uniformly, pouring the powders into an aqueous solution of methyl cellulose with the mass fraction of 1%, and stirring uniformly to form a paste, wherein the mixture ratio of the components is 22.5 parts by mass of diamond micro powder, 67.5 parts by mass of nickel-based brazing filler metal powder and 10 parts by mass of a binder.
S30: fixing the pretreated blade to a frame plate, and coating a paste material to the periphery and the material facing surface of the blade in a brush dipping manner to obtain the blade to be coated by the brazing rod;
s40: after the blade of waiting for the borer to scribble is dry, carry out the response borer under the protective gas environment and scribble, induction heating electric current 55A, adopt the head of shaking during borer scribbles and strike the blade frequently, lead to 99.5% argon gas as the protective gas, gas flow 3L/min, use the special blowing head to send argon gas to the borer and scribble the heating region surface, borer scribbles and finishes and stops argon gas transport when cooling to below 200 ℃, can obtain above-mentioned blade including diamond wearing layer after the cooling.
Example 3
The embodiment provides a preparation method of a blade comprising a diamond wear-resistant layer, which comprises the following steps:
s00: pre-treating; the surface of the blade is pretreated by sand blasting to remove oil stain, rust, oxide skin and the like on the surface.
S10: cutting an adaptive frame plate in advance according to the target shape and the target thickness of the diamond wear-resistant layer; the diamond wear layer has the following dimensions: the coating thickness of the second wear-resistant layer is 5 mm, and the thickness of the outermost edge of the blade is 5 mm; the maximum position of the thickness of the first wear-resistant layer is 5 mm, and the minimum position of the thickness of the first wear-resistant layer is 0.5 mm; the thickness of the third wear-resistant layer is 0.4 mm, and the stainless steel frame plate is cut according to the size.
S20: mixing the raw materials of the diamond wear-resistant layer to prepare a paste material; weighing 270/325-mesh non-coated diamond micro powder, 200/230-mesh silicon carbide and 230/270-mesh BNi-2 nickel-based brazing filler metal powder in proportion, placing the three kinds of powder in a three-dimensional mixer for premixing uniformly, pouring the three kinds of powder into an aqueous solution of hydroxypropyl methyl cellulose with the mass fraction of 0.8%, and stirring uniformly to form a paste, wherein the mixture ratio of the components is 30 parts by mass of diamond micro powder, 30 parts by mass of hard particles, 30 parts by mass of nickel-based brazing filler metal powder and 10 parts by mass of a binder.
S30: and fixing the pretreated blade to a frame plate, and coating a paste material to the periphery and the material facing surface of the blade in a brush dipping manner to obtain the blade to be brazed.
S40: after the blade of waiting for the borer to scribble is dry, carry out the response borer under the protective gas environment and scribble, induction heating electric current 55A, adopt the head of shaking during borer scribbles and strike the blade frequently, lead to 99.5% argon gas as the protective gas, gas flow 3L/min, use the special blowing head to send argon gas to the borer and scribble the heating region surface, borer scribbles and finishes and stops argon gas transport when cooling to below 200 ℃, can obtain above-mentioned blade including diamond wearing layer after the cooling.
Example 4
The embodiment provides a preparation method of a blade comprising a diamond wear-resistant layer, which comprises the following steps:
s00: pre-treating; the surface of the blade is pretreated by sand blasting to remove oil stain, rust, oxide skin and the like on the surface.
S10: cutting an adaptive frame plate in advance according to the target shape and the target thickness of the diamond wear-resistant layer; the diamond wear layer has the following dimensions: the coating thickness of the second wear-resistant layer is 5 mm, and the thickness of the outermost edge of the blade is 5 mm; the maximum position of the thickness of the first wear-resistant layer is 5 mm, and the minimum position of the thickness of the first wear-resistant layer is 0.5 mm; and cutting a stainless steel frame plate according to the size.
S20: mixing the raw materials of the diamond wear-resistant layer to prepare a paste material; weighing 270/325-mesh non-coated diamond micro powder, 200/230-mesh silicon carbide and 230/270-mesh BNi-2 nickel-based brazing filler metal powder in proportion, placing the three kinds of powder in a three-dimensional mixer for premixing uniformly, pouring the three kinds of powder into an aqueous solution of hydroxypropyl methyl cellulose with the mass fraction of 0.8%, and stirring uniformly to form a paste, wherein the mixture ratio of the components is 30 parts by mass of diamond micro powder, 30 parts by mass of hard particles, 30 parts by mass of nickel-based brazing filler metal powder and 10 parts by mass of a binder.
S30: and fixing the pretreated blade to a frame plate, and coating a paste material to the periphery and the material facing surface of the blade in a brush dipping manner to obtain the blade to be brazed.
S40: after the blade of waiting for the borer to scribble is dry, carry out the response borer under the protective gas environment and scribble, induction heating electric current 55A, adopt the head of shaking during borer scribbles and strike the blade frequently, lead to 99.5% argon gas as the protective gas, gas flow 3L/min, use the special blowing head to send argon gas to the borer and scribble the heating region surface, borer scribbles and finishes and stops argon gas transport when cooling to below 200 ℃, can obtain above-mentioned blade including diamond wearing layer after the cooling.
Examples of the experiments
Abrasive wear tests were performed on standard wear specimens prepared by braze-coating a diamond wear layer consistent with that provided in example 2, and by plasma-surfacing a standard wear specimen with 35% WC coating and 35% WC coating, the results of which are shown in table 1.
TABLE 1 abrasion test results
| Coating layer | Mass/g of coated sample before abrasion | Mass loss Δ m/mg |
| Examples of the experiments | 146.3985 | 21.4 |
| 35% WC coating | 158.1842 | 183.3 |
| 35% WC coating by surfacing | 163.1061 | 259.3 |
Under the same abrasion condition, the abrasion weight loss of the experimental example is only 11.6% of that of a 35% WC coating which is brazed, 8.3% of that of the 35% WC coating which is surfacing welded, and the diamond wear-resistant layer has the advantages of small thickness and light weight while playing a great abrasion-resistant role, and can reduce the resistance of material conveying and the resistance of equipment operation; in addition, the wear resistance of the 35% WC coating of the brazing filler metal is also superior to that of the 35% WC coating of the surfacing welding because the surfacing welding temperature is high, the brazing filler metal is fully melted, WC sinks and is greatly enriched at the bottom of the coating, and a heat affected zone of the surfacing welding is also large, so that the blade is deformed, the thermal stress is increased, and the service life is short.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A blade comprising a diamond abradable layer,
the blade (20) is spirally arranged on the auger conveying rod body (10);
wherein the surface of the blade (20) is provided with a diamond wear-resistant layer (30), and the diamond wear-resistant layer (30) comprises a first wear-resistant layer (31) and a second wear-resistant layer (32);
the blade (20) comprises a material facing surface (21) and a periphery (22);
the first wear-resistant layer (31) is arranged on the material receiving surface (21);
the second wear layer (32) is provided on the peripheral edge (22).
2. The blade of claim 1,
the blade (20) further comprises a back surface (23), and the back surface (23) and the material receiving surface (21) are two opposite surfaces;
the diamond wear layer (30) further comprises a third wear layer (33);
the third wear layer (33) is provided on the back surface (23).
3. The blade of claim 1,
the thickness of the first wear-resistant layer (31) is gradually reduced along the direction close to the conveying rod body (10).
4. The blade of claim 1,
the thickness of the diamond wear-resistant layer (30) is 0.2 mm-5 mm.
5. The blade of claim 1,
a plurality of expansion gaps (40) are arranged on the diamond wear-resistant layer (30) at intervals,
the expansion gaps (40) are arranged in the direction that the outer edges of the diamond wear-resistant layers (30) point to the axis of the conveying rod body (10).
6. The blade of claim 5,
one end of each expansion joint (40) far away from the conveying rod body (10) is a first end (41), and the length of an arc (42) between the first ends (41) of any two expansion joints (40) is 2-15 cm; and/or
The seam width of the expansion seam (40) is 0.2 mm-1 mm.
7. The blade of claim 1,
the diamond wear-resistant coating (30) comprises the following raw materials in parts by mass:
8. the blade of claim 7,
the diamond micro powder comprises at least one of non-coated diamond micro powder and metal-coated diamond micro powder; and/or
The hard particles comprise at least one of tungsten carbide, boron carbide, silicon carbide, boron nitride and silicon nitride; and/or
The brazing filler metal alloy powder comprises nickel-based alloy brazing filler metal powder; and/or
The binder comprises at least one aqueous solution of hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, ethyl cellulose, sodium carboxymethyl cellulose, methyl cellulose and hydroxypropyl methyl cellulose; the mass fraction of solute in the aqueous solution is 0.5-1.5%.
9. A method of manufacturing a blade according to any of claims 1-8, comprising the steps of:
s10: cutting a matched frame plate in advance according to the target shape and the target thickness of the diamond wear-resistant layer;
s20: mixing the raw materials of the diamond wear-resistant layer to prepare a paste material;
s30: fixing the blade to the frame plate, and coating the paste material on the periphery of the blade and the material facing surface and the back surface of the blade to obtain the blade to be brazed;
s40: and after the blade to be brazed is dried, carrying out induction brazing in a protective gas environment to obtain the blade comprising the diamond wear-resistant layer.
10. A screw conveyor comprising a blade according to any one of claims 1 to 8.
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