Pulverizer blade with composite surfacing wear-resistant layer and laser cladding process of pulverizer blade

Abstract

The invention discloses a crusher blade with a composite surfacing wear-resistant layer and a laser cladding process of the crusher blade, and relates to the technical field of blade laser cladding processing. When the composite screening net piece moves upwards, a rotary transmission structure is controlled by an extrusion block to drive a spiral unblocking piece to conduct rotary unblocking work in a screening plate; the stirring and heating assembly mixes and heats the composite powder; a screening plate and a first scraping piece are matched to preliminarily screen composite powder, large-particle impurities are screened out, and a first transmission rod, a first bevel gear structure, a second transmission rod, a second bevel gear structure, a first transmission gear, a lifting gear, a lifting rod, a lifting rack and a gravity block are matched to control a spiral unblocking piece to rotate forwards or reversely in screening holes. And the composite powder is conveyed, the screening holes are cleaned, and the situation that the screening holes are blocked during working is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of laser cladding processing of blades, and particularly relates to a pulverizer blade with a composite hardfacing wear-resistant layer and a laser cladding process thereof. BACKGROUND

[0002] The blade is a core component in the fields of mechanical processing and material processing, and its performance directly affects the machining precision, efficiency and cost; the pulverizer blade is a cutting tool used in a pulverizer, and its function is to crush materials into the required particle size; the laser cladding is a surface modification and repair technology for rapidly melting and solidifying alloy powder and a substrate surface by a high-energy laser beam to form a metallurgical bonding coating, and its core advantages are high bonding strength of the coating and the substrate, small heat-affected zone, controllable coating composition, which can significantly improve the wear resistance, corrosion resistance and impact resistance of the part, and can also be used for repairing and remanufacturing of waste parts; the pulverizer blade is usually subjected to the laser cladding process to improve its performance during processing.

[0003] The existing pulverizer blade uses a powder feeding structure to deliver composite powder to a laser cladding device for hardfacing wear-resistant layer processing during the laser cladding process, but when the composite powder is delivered to the powder feeding structure after being mixed and stirred, it may form clumps or contain large particle impurities, which may cause blockage of the powder feeding structure during operation, so that the staff needs to stop and clean, thereby reducing the processing efficiency of the pulverizer blade and the use effect of the laser cladding process, and failing to meet people's needs. SUMMARY

[0004] The application aims to solve the technical problems in the prior art; for this purpose, the application provides a pulverizer blade with a composite hardfacing wear-resistant layer and a laser cladding process thereof.

[0005] A laser cladding process for a pulverizer blade with a composite hardfacing wear-resistant layer, comprising the following steps: S1, fixing a treated blade body to a laser processing position and preparing composite powder; S2, introducing the composite powder into a powder storage box and mixing and heating the composite powder by a stirring and heating assembly; S3, preliminarily screening the composite powder by a screening plate cooperating with the stirring and heating assembly, and re-screening the composite powder by a composite screening net moving up and down; S4, when the composite screening net moves upward, rotating and unblocking the screw unblocking piece in the screening plate by the rotating transmission structure controlled by the extrusion block; S5, delivering the screened composite powder to a powder feeding structure by a conveying assembly, and delivering the composite powder to a molten pool by the powder feeding structure for laser cladding processing.

[0006] As a further scheme of the present application: in step S1, the blade body is cleaned of oil stains, rust and oxide skin, which can be treated by sand blasting of SA2.5 grade, or wiped with organic solvents such as acetone and ethanol, and then polished with sandpaper of 80-120 mesh to make the surface roughness reach Ra3.2-6.3μm; then, the blade is checked for cracks, pores and other defects by means of penetration detection or magnetic powder detection to avoid defects affecting the bonding effect of the cladding layer.

[0007] As a further scheme of the present application: in step S2, the stirring and heating assembly comprises a stirring rod and a heating jacket; the stirring rod is rotatably arranged on the upper side of the inside of the powder storage box and is provided with a plurality of stirring paddles for cooperation; the heating jacket is arranged on the outer wall of the powder storage box and heats the working area of the stirring paddles; the bottom end of the stirring rod is provided with a first scraping member for scraping the upper end surface of the screening plate; and the top end of the powder storage box is provided with a stirring motor for controlling the rotation of the stirring rod.

[0008] As a further scheme of the present application: in step S3, a plurality of screening holes are arranged in a circular array on the screening plate; two helical unblocking members are symmetrically arranged in the screening holes; a material guide strip is symmetrically arranged on the helical unblocking member and connected with the screening hole; a first support block is coaxially arranged between the adjacent helical unblocking members; a first transmission rod is rotatably arranged in the material guide strip and transmissionally connected with the extrusion block; a first bevel gear structure is coaxially arranged in the first support block and connected with the first transmission rod and the helical unblocking member; a second transmission rod is coaxially arranged on the first bevel gear structure and controls the synchronous rotation of the adjacent first transmission rods; and the upper part of the material guide strip is a symmetrical inclined surface, which facilitates the discharging, and the rotation directions of the upper and lower helical unblocking members are the same, so that the two helical unblocking members cooperate to discharge.

[0009] One end of the first transmission rod is coaxially provided with a second bevel gear structure; the second bevel gear structure is coaxially provided with a first transmission gear; a lifting gear is rotatably arranged in the screening plate and meshed with the first transmission gear; the lifting gear is transmissionally connected with the extrusion block; the lifting gear controls the rotation of the second bevel gear structure through the first transmission gear, so that the second bevel gear structure drives the first bevel gear structure to work through the first transmission rod, the first bevel gear structure drives the two helical unblocking members to work, and the first bevel gear structure drives the helical unblocking members in the adjacent screening holes to work through the second transmission rod.

[0010] As a further scheme of the present application: the extrusion block is vertically provided with a lifting rod movably sealed with the screening plate; the lifting rod is provided with a lifting rack engaged with a lifting gear; the screening plate is provided with a guide block guidingly connected with the lifting rod; the bottom end of the screening plate is provided with a sealing ring sealingly connected with the lifting rod, the sealing ring is detachably embedded in the bottom end of the screening plate, so that the lower end surface of the sealing ring is flush with the bottom end surface of the screening plate; the bottom end of the lifting rod is provided with a gravity block aligned with the extrusion block; one side of the lifting rod is provided with a sliding groove slidingly connected with the guide block, the guide block can stably guide the lifting rod to lift and lower; the other side of the lifting rod is provided with a groove matched with the lifting rack.

[0011] As a further scheme of the present application: in step S4, the composite screening net piece includes a first screening net piece and a second screening net piece, the first screening net piece is arranged above the second screening net piece, the mesh size of the first screening net piece is larger than that of the second screening net piece; the first screening net piece is arranged on the inner side of the moving ring, the moving ring is attached to the inner wall of the powder storage box, and the moving ring moves in attachment with the powder storage box; the upper end of the second screening net piece is provided with a telescopic structure vertically connected with the bottom end of the moving ring; a plurality of extrusion blocks are arranged in a circular array on the inner wall of the moving ring; when the moving ring drives the first screening net piece and the second screening net piece to move upward, the extrusion blocks control the spiral unblocking piece to rotate in the screening hole through the gravity block and the lifting rod; the telescopic structure includes a telescopic rod vertically arranged at the bottom end of the moving ring and a telescopic pipe vertically arranged at the upper end of the second screening net piece, the telescopic rod and the telescopic pipe are movably sealed, the telescopic pipe is provided with a telescopic spring connected with the bottom end of the telescopic rod, and a plurality of telescopic pipes are vertically arranged at the edge of the second screening net piece; the second screening net piece is attached to the inner wall of the powder storage box.

[0012] As a further scheme of the present application: the upper end of the moving ring is provided with a moving rod movably attached to the screening plate, the screening plate is provided with a moving hole movably attached to the moving ring; the inner top surface of the powder storage box is provided with a connecting box sealingly connected with a plurality of moving rods; the connecting box is provided with a moving block connected with the moving rod; the connecting box is provided with a plurality of lead screw transmission structures controlling the moving block to lift and lower, the lead screw transmission structure is detachably fixed with the moving block; the top end of the lead screw transmission structure is coaxially provided with a second transmission gear; the stirring rod is provided with a rotating gear ring controlling a plurality of second transmission gears to synchronously rotate; the rotating gear ring is engaged with a plurality of second transmission gears, respectively, and the moving ring stably lifts and lowers in the connecting box through the moving rod and the moving block.

[0013] As a further scheme of the present application: in step S5, the inner side lower part of the powder storage box is provided with a material guiding table, a powder discharging groove in a funnel structure is formed in the material guiding table, the powder discharging groove is communicated with the discharging port; the bottom end of the material guiding table is provided with the discharging port; the inner side of the material guiding table is rotatably provided with a spiral powder discharging piece which is arranged in alignment with the discharging port, the spiral powder discharging piece conveys the composite powder in the powder discharging groove into the discharging port; the spiral powder discharging piece is symmetrically provided with a second scraping piece for cleaning the material guiding table, the second scraping piece scrapes and conveys the composite powder on the material guiding table.

[0014] As a further scheme of the present application: the discharging port is provided with a support piece for rotatably supporting the spiral powder discharging piece, the support piece comprises a second support block connected with the bottom end of the spiral powder discharging piece and a powder discharging strip connecting the second support block with the discharging port; the support piece is provided with a third bevel gear structure coaxially connected with the spiral powder discharging piece, the third bevel gear structure is arranged in the interior of the second support block; the bottom end of the powder storage box is provided with a first protection box; the upper part of the outer wall of the powder storage box is provided with a second protection box; the first protection box is provided with a fourth bevel gear structure coaxially connected with the third bevel gear structure, one end of the third bevel gear structure is coaxially provided with a third transmission rod penetrating through the powder discharging strip and the discharging port, one end of the third transmission rod extends into the first protection box and is connected with the fourth bevel gear structure; the second protection box is provided with a rotating gear in transmission connection with a second transmission gear, the powder storage box is rotatably provided with a third transmission gear in meshing connection with the second transmission gear, the second protection box is formed with a through groove matched with the third transmission gear, the third transmission gear is in meshing connection with the rotating gear; the rotating gear is provided with a fourth transmission rod coaxially connected with the fourth bevel gear structure.

[0015] As a further scheme of the present application: a pulverizer blade of a composite overlay wear-resistant layer comprises a blade body, an overlay wear-resistant layer and a transition layer, the overlay wear-resistant layer is composed of a wear-resistant framework and a bearing matrix, the wear-resistant framework is mainly high-hardness ceramic particles or carbide, the bearing matrix is mainly metal alloy, wraps and fixes the wear-resistant framework, fills the gaps between the wear-resistant framework, and forms metallurgical combination with the blade body to ensure that the wear-resistant layer does not fall off; the transition layer is used for relieving thermal stress, and is arranged between the blade body and the overlay wear-resistant layer; the transition layer can be selected from materials with thermal expansion coefficients close to that of the base body, which can effectively relieve thermal stress and prevent the base body from cracking, or can be selected from materials with good metallurgical compatibility with the overlay layer, which can improve the interface bonding strength and prevent the overlay layer from falling off.

[0016] Compared with the prior art, the present application has the following beneficial effects: (1) The stirring and heating assembly is arranged to mix and heat the composite powder, so that the agglomeration of the composite powder is reduced, the first scraper and the screening plate are matched to preliminarily screen the composite powder, and the large-particle impurities are screened out, the guide strip, the first supporting block, the first transmission rod, the first bevel gear structure, the second transmission rod, the second bevel gear structure, the first transmission gear, the lifting gear, the lifting rod, the lifting rack, the guide block and the gravity block are arranged to control the forward rotation or the reverse rotation of the spiral unblocking piece in the screening hole, so that the composite powder is conveyed and the screening hole is cleaned, the plugging of the screening hole during work is avoided, the processing efficiency of the pulverizer blade is improved, and the use effect of the laser cladding process is improved.

[0017] (2) The composite screening net piece is arranged to be used with the screening plate to screen the composite powder multiple times, improve the uniformity of the composite powder, avoid the plugging of the powder feeding structure by the composite powder, and the first screening net piece, the moving ring, the second screening net piece and the telescopic structure are arranged to move the screening, improve the screening effect, and the stirring rod, the moving rod, the connecting box, the moving block, the screw transmission structure, the second transmission gear and the rotating gear ring control the moving ring to lift, so that the gravity block and the lifting rod drive the spiral unblocking piece to work through the extrusion block, improve the screening effect of the powder storage box, and improve the use effect of the laser cladding process.

[0018] (3) The guide table, the discharge port, the second scraper and the spiral feeding piece are arranged to quickly convey the composite powder screened by the composite screening net piece into the powder feeding structure, avoid accumulation in the powder storage box, and the supporting piece, the third bevel gear structure, the first protective box, the second protective box, the fourth bevel gear structure, the rotating gear and the fourth transmission rod are arranged to control the spiral feeding piece and the second scraper to work, and the rotating gear ring and the second transmission gear cooperate with the stirring rod to improve the discharging effect of the powder storage box and improve the use effect of the laser cladding process. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the laser cladding process of the application.

[0020] Figure 2 It is a partial structure diagram of the powder storage box and the powder feeding structure in the application.

[0021] Figure 3 It is a sectional view of the powder storage box in the application.

[0022] Figure 4 It is a partial structure diagram of the stirring and heating assembly and the screening plate in the application.

[0023] Figure 5 It is a partial structure diagram of the stirring and heating assembly and the screening plate in the application. Figure 4 It is an enlarged view of the structure at A in the application.

[0024] Figure 6 It is the local structure diagram of the composite screening net piece and the rotating tooth ring in the application.

[0025] Figure 7 It is the local structure diagram of the second screening net piece and the telescopic structure in the application.

[0026] Figure 8 It is the local structure diagram of the screening plate and the screening hole in the application.

[0027] Figure 9 It is the local structure diagram of the spiral unblocking piece and the gravity block in the application.

[0028] Figure 10 It is the local structure diagram of the first bevel gear structure and the lifting rod in the application.

[0029] Figure 11 It is the local structure diagram of the spiral unloading piece and the rotating gear in the application.

[0030] Figure 12 It is the local structure diagram of the blade body in the application.

[0031] In the figure: 1, blade body; 2, powder storage box; 3, screening plate; 4, composite screening net piece; 5, extrusion block; 6, spiral unblocking piece; 7, stirring rod; 8, stirring paddle; 9, heating sleeve; 10, first scraping piece; 11, screening hole; 12, material guide strip; 13, first supporting block; 14, first transmission rod; 15, first bevel gear structure; 16, second transmission rod; 17, second bevel gear structure; 18, first transmission gear; 19, lifting gear; 20, lifting rod; 21, lifting rack; 22, guide block; 23, sealing ring; 24, gravity block; 25, first screening net piece; 26, moving ring; 27, second screening net piece; 28, telescopic structure; 29, moving rod; 30, connecting box; 31, moving block; 32, screw transmission structure; 33, second transmission gear; 34, rotating tooth ring; 35, material guide table; 36, discharge port; 37, spiral unloading piece; 38, second scraping piece; 39, supporting piece; 40, third bevel gear structure; 41, first protective box; 42, second protective box; 43, fourth bevel gear structure; 44, rotating gear; 45, fourth transmission rod; 46, hardfacing wear-resistant layer; 47, transition layer; 48, stirring motor; 49, telescopic rod; 50, telescopic tube; 51, telescopic spring; 52, second supporting block; 53, unloading strip; 54, third transmission rod; 55, third transmission gear; 56, powder feeding structure; 57, support frame. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be clearly and completely described below with examples. Obviously, the described examples are only some of the examples of the present application, rather than all the examples. Based on the examples in the present application, all the other examples obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0033] Embodiment one Please refer to Figure 1 - Figure 8 The present application provides a laser cladding process for a pulverizer blade with a composite surfacing wear-resistant layer, comprising the following steps: S1, fixing the treated blade body 1 to the laser processing position and preparing the composite powder; S2, introducing the composite powder into the powder storage box 2 and mixing and heating the composite powder through the stirring and heating assembly; S3, using the screening plate 3 in cooperation with the stirring and heating assembly to preliminarily screen the composite powder, and using the composite screening mesh 4 moving up and down to screen the composite powder again; S4, when the composite screening mesh 4 moves up, the rotating transmission structure is controlled by the extrusion block 5 to drive the spiral unblocking piece 6 to rotate and unblock in the screening plate 3; S5, the composite powder after screening is conveyed to the powder feeding structure 56 through the conveying assembly, and the composite powder is conveyed to the molten pool for laser cladding processing through the powder feeding structure 56.

[0034] In the present application, in step S1, the surface of the blade body 1 is cleaned of oil stains, rust and oxide skin, which can be treated by SA2.5 grade sand blasting, or wiped with organic solvents such as acetone and ethanol, and then polished step by step with 80-120 mesh sandpaper to make the surface roughness reach Ra3.2-6.3μm; then, by means of penetration detection or magnetic powder detection, it is checked whether the blade has defects such as cracks and pores, so as to avoid the influence of defects on the bonding effect of the cladding layer.

[0035] In the present application, the upper end of the powder feeding structure 56 is provided with a support frame 57 for mounting the powder storage box 2, and a through groove for discharging is formed in the support frame 57, so that the powder storage box 2 is in communication with the upper end of the powder feeding structure 56.

[0036] In step S2, the stirring and heating assembly in the present application comprises a stirring rod 7 and a heating sleeve 9; the stirring rod 7 is rotatably arranged on the upper part of the inner side of the powder storage box 2 and is provided with a plurality of stirring paddles 8 used in cooperation; the outer wall of the powder storage box 2 is provided with a charging port for adding composite powder and an exhaust port for exhausting; the heating sleeve 9 is arranged on the outer wall of the powder storage box 2 and heats the working area of the stirring paddles 8; the bottom end of the stirring rod 7 is provided with a first scraping piece 10 for scraping the upper end surface of the screening plate 3; the top end of the powder storage box 2 is provided with a stirring motor 48 for controlling the rotation of the stirring rod 7.

[0037] In the embodiment, the stirring motor 48 is started to drive the stirring rod 7 to rotate, so that the stirring rod 7 drives the stirring paddle 8 to rotate, the mixed composite powder in the powder storage box 2 is fully stirred, the heating jacket 9 is started to heat the composite powder, the moisture in the composite powder is reduced, and the composite powder is prevented from agglomeration; when the stirring rod 7 and the stirring paddle 8 rotate, the composite powder is preliminarily screened through the screening plate 3, and the stirring rod 7 drives the first scraping part 10 to rotate on the upper end surface of the screening plate 3, so that the composite powder is prevented from being accumulated on the screening plate 3 to block the screening plate 3.

[0038] In step S3, the screening plate 3 is provided with a plurality of screening holes 11 in a circular array; the two spiral unblocking parts 6 are symmetrically arranged in the screening holes 11; the spiral unblocking parts 6 are symmetrically provided with material guide strips 12 connected with the screening holes 11; coaxial first supporting blocks 13 are arranged between adjacent spiral unblocking parts 6; the material guide strips 12 are rotatably provided with first transmission rods 14 in transmission connection with the extrusion blocks 5; the first supporting blocks 13 are provided with first bevel gear structures 15 coaxially connected with the first transmission rods 14 and the spiral unblocking parts 6; the first bevel gear structures 15 are coaxially provided with second transmission rods 16 for controlling adjacent first transmission rods 14 to rotate synchronously; the upper portions of the material guide strips 12 are inclined surfaces, facilitating material discharging; and the rotation directions of the upper and lower spiral unblocking parts 6 are the same, so that the two spiral unblocking parts 6 cooperate to discharge materials.

[0039] In the embodiment, the screening plate 3 screens the composite powder through the screening holes 11, the first transmission rods 14 drive the first bevel gear structures 15 to work, the first bevel gear structures 15 drive the two spiral unblocking parts 6 to rotate on the first supporting blocks 13, and the first bevel gear structures 15 drive the spiral unblocking parts 6 in adjacent screening holes 11 to rotate through the second transmission rods 16, so that the spiral unblocking parts 6 rotate in the screening holes 11 to convey the composite powder in the screening holes 11.

[0040] In the embodiment, one end of the first transmission rod 14 is coaxially provided with a second bevel gear structure 17; the second bevel gear structure 17 is coaxially provided with a first transmission gear 18; the screening plate 3 is rotatably provided with a lifting gear 19 in mesh with the first transmission gear 18; the lifting gear 19 is in transmission connection with the extrusion block 5; the lifting gear 19 controls the second bevel gear structure 17 to rotate through the first transmission gear 18, so that the second bevel gear structure 17 drives the first bevel gear structure 15 to work through the first transmission rod 14, the first bevel gear structure 15 drives the two spiral unblocking parts 6 to work, and the first bevel gear structure 15 drives the spiral unblocking parts 6 in adjacent screening holes 11 to work through the second transmission rod 16.

[0041] In the embodiment, the extrusion block 5 drives the lifting gear 19 to rotate, so that the lifting gear 19 drives the first transmission gear 18 to rotate, the first transmission gear 18 drives the second bevel gear structure 17 to rotate, the second bevel gear structure 17 drives the first transmission rod 14 to rotate, the first transmission rod 14 drives the first bevel gear structure 15 to work, the first bevel gear structure 15 drives the spiral unblocking element 6 to rotate, and the first bevel gear structure 15 drives the second transmission rod 16 to rotate, the second transmission rod 16 drives the adjacent first bevel gear structure 15 to rotate, so that the plurality of spiral unblocking elements 6 work to transport the composite powder in the screening hole 11.

[0042] In the embodiment, the extrusion block 5 is vertically provided with a lifting rod 20 movably sealed with the screening plate 3; the lifting rod 20 is provided with a lifting rack 21 engaged with the lifting gear 19; the screening plate 3 is provided with a guide block 22 guidingly connected with the lifting rod 20; the bottom end of the screening plate 3 is provided with a sealing ring 23 sealingly connected with the lifting rod 20, the sealing ring 23 is detachably embedded in the bottom end of the screening plate 3, so that the lower end surface of the sealing ring 23 is flush with the bottom end surface of the screening plate 3; the bottom end of the lifting rod 20 is provided with a gravity block 24 aligned with the extrusion block 5; one side of the lifting rod 20 is provided with a sliding groove slidingly connected with the guide block 22, the guide block 22 can stably guide the lifting rod 20 to lift and lower, and the other side of the lifting rod 20 is provided with a groove matched with the lifting rack 21.

[0043] In the embodiment, when the extrusion block 5 moves upward and controls the gravity block 24 to move, the gravity block 24 drives the lifting rod 20 to move upward, the lifting rod 20 drives the guide block 22 to slide in the sliding groove, the lifting rod 20 drives the lifting rack 21 to move, so that the lifting rack 21 drives the lifting gear 19 to rotate, thereby controlling the spiral unblocking element 6 to work; when the extrusion block 5 is separated from the gravity block 24, the gravity block 24 drives the lifting rod 20 to move downward, so that the lifting rack 21 drives the lifting gear 19 to rotate, thereby controlling the spiral unblocking element 6 to unblock.

[0044] In step S4, the composite screening net piece 4 in the application includes a first screening net piece 25 and a second screening net piece 27, the first screening net piece 25 is arranged above the second screening net piece 27, the mesh size of the first screening net piece 25 is larger than that of the second screening net piece 27; the first screening net piece 25 is arranged on the inner side of the moving ring 26, the moving ring 26 is attached to the inner wall of the powder storage box 2, and the moving ring 26 moves with the powder storage box 2; the upper end of the second screening net piece 27 is provided with an extension structure 28 connected perpendicularly to the bottom end of the moving ring 26; a plurality of extrusion blocks 5 are arranged in a circular array on the inner wall of the moving ring 26; when the moving ring 26 drives the first screening net piece 25 and the second screening net piece 27 to move upward, the extrusion blocks 5 control the spiral unblocking piece 6 to rotate in the screening hole 11 through the gravity block 24 and the lifting rod 20; the extension structure 28 includes an extension rod 49 arranged perpendicularly to the bottom end of the moving ring 26 and an extension pipe 50 arranged perpendicularly to the upper end of the second screening net piece 27, the extension rod 49 and the extension pipe 50 are movably sealed, the extension pipe 50 is provided with an extension spring 51 connected to the bottom end of the extension rod 49, a plurality of extension pipes 50 are arranged perpendicularly to the edge of the second screening net piece 27, and the second screening net piece 27 is attached to the inner wall of the powder storage box 2.

[0045] In the embodiment, when the moving ring 26 drives the first screening net piece 25 to move upward, the first screening net piece 25 screens the composite powder, the moving ring 26 drives the extension rod 49 to move, the extension rod 49 drives the extension spring 51 to extend and retract, the extension rod 49 drives the extension pipe 50 to move upward, the extension pipe 50 drives the second screening net piece 27 to move upward, the second screening net piece 27 screens the composite powder, the moving ring 26 drives the extrusion blocks 5 to move to the gravity block 24, and when the extrusion blocks 5 are attached to the gravity block 24, the gravity block 24 drives the lifting rod 20 to move.

[0046] In the application, the upper end of the moving ring 26 is provided with a moving rod 29 that moves with the screening plate 3, the screening plate 3 is provided with a moving hole that is attached to the moving ring 26; the inner top surface of the powder storage box 2 is provided with a connecting box 30 that is sealingly connected to a plurality of moving rods 29; the connecting box 30 is provided with a moving block 31 connected to the moving rod 29; the connecting box 30 is provided with a plurality of lead screw transmission structures 32 that control the moving block 31 to move up and down, the lead screw transmission structure 32 is detachably fixed to the moving block 31; the top end of the lead screw transmission structure 32 is coaxially provided with a second transmission gear 33; the stirring rod 7 is provided with a rotating gear ring 34 that controls a plurality of second transmission gears 33 to rotate synchronously, the inner wall of the rotating gear ring 34 is provided with a reinforcing piece connected to the stirring rod 7; the rotating gear ring 34 is meshed with a plurality of second transmission gears 33 respectively, and the moving ring 26 stably moves up and down in the connecting box 30 through the moving rod 29 and the moving block 31.

[0047] In the embodiment, when the stirring rod 7 rotates, the stirring rod 7 drives the rotating tooth ring 34 to rotate through the reinforcing part, the rotating tooth ring 34 drives the second transmission gear 33 to rotate, the second transmission gear 33 drives the screw transmission structure 32 to work, the screw transmission structure 32 drives the moving block 31 to move, the moving block 31 drives the moving rod 29 to move, and the moving rod 29 drives the moving ring 26 to move.

[0048] Embodiment two On the basis of the embodiment one, refer to 2- Figure 11 , the second embodiment of the application, wherein, in step S5, the inner lower part of the powder storage box 2 is provided with a material guiding table 35, a discharging groove in the shape of a funnel is formed in the material guiding table 35, the discharging groove is in communication with a discharging port 36; the bottom end of the material guiding table 35 is provided with the discharging port 36; the inner side of the material guiding table 35 is rotatably provided with a spiral discharging part 37 aligned with the discharging port 36, the spiral discharging part 37 conveys the composite powder in the discharging groove to the discharging port 36; the spiral discharging part 37 is symmetrically provided with a second scraping part 38 for cleaning the material guiding table 35, the spiral discharging part 37 is symmetrically provided with a reinforcing part connected with the second scraping part 38, the second scraping part 38 scrapes and conveys the composite powder on the material guiding table 35, the discharging port 36 is in communication with a powder conveying structure 56, and the powder conveying structure 56 is an existing powder feeder.

[0049] In the embodiment, the spiral discharging part 37 rotates to convey the composite powder on the material guiding table 35 to the discharging port 36, and the composite powder is conveyed to the powder conveying structure 56 through the discharging port 36, the spiral discharging part 37 rotates to drive the second scraping part 38 to rotate through the reinforcing part, and the second scraping part 38 scrapes and conveys the composite powder on the material guiding table 35.

[0050] The support piece 39 is coaxially connected with the third bevel gear structure 40, one end of the third bevel gear structure 40 is coaxially provided with the third transmission rod 54 penetrating through the discharging strip 53 and the discharging port 36, one end of the third transmission rod 54 extends into the first protection box 41 and is connected with the fourth bevel gear structure 43; the second protection box 42 is provided with the rotating gear 44 in transmission connection with the second transmission gear 33, the powder storage box 2 is rotatably provided with the third transmission gear 55 in mesh with the second transmission gear 33, a through slot matched with the third transmission gear 55 is formed in the second protection box 42, and the third transmission gear 55 is in mesh with the rotating gear 44; the rotating gear 44 is provided with the fourth transmission rod 45 coaxially connected with the fourth bevel gear structure 43.

[0051] In the embodiment, when the stirring rod 7 rotates, the rotating gear ring 34 drives the second transmission gear 33 to rotate, the second transmission gear 33 drives the third transmission gear 55 to rotate, the third transmission gear 55 drives the rotating gear 44 to rotate, the rotating gear 44 drives the fourth transmission rod 45 to rotate, the fourth transmission rod 45 drives the fourth bevel gear structure 43 to rotate, the fourth bevel gear structure 43 drives the third transmission rod 54 to rotate, the third transmission rod 54 drives the third bevel gear structure 40 to rotate, and the third bevel gear structure 40 drives the spiral discharging piece 37 to rotate on the support piece 39 to perform the discharging work.

[0052] Embodiment three On the basis of the embodiment two, referring to Figure 12 , the third embodiment of the present application, the pulverizer blade of the composite overlay wear-resistant layer comprises a blade body 1, an overlay wear-resistant layer 46 and a transition layer 47, the overlay wear-resistant layer 46 is composed of a wear-resistant framework and a bearing matrix, the wear-resistant framework is mainly high-hardness ceramic particles or carbide, the bearing matrix is mainly metal alloy, wraps and fixes the wear-resistant framework, fills the gaps between the wear-resistant framework, and forms a metallurgical bond with the blade body 1 to protect the overlay wear-resistant layer 46 from falling off; the transition layer 47 is used for relieving thermal stress, and is arranged between the blade body 1 and the overlay wear-resistant layer 46; the transition layer 47 can be selected from materials with a thermal expansion coefficient close to that of the base body, which can effectively relieve thermal stress and prevent the base body from cracking, or can be selected from materials with good metallurgical compatibility with the overlay layer, which can improve the interface bonding strength and prevent the overlay layer from falling off.

[0053] The above examples are only used to illustrate the technical method of the present application but not to limit the present application. Although the present application is explained in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical method of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present application.

Claims

1. A laser cladding process for shredder knife with composite build-up wear layer characterized by, It comprises the following steps: S1, the processed blade body is fixed to the laser processing place, and the composite powder is prepared; S2, the composite powder is introduced into the powder storage box, and the composite powder is mixed and heated by the stirring and heating assembly; S3, the composite powder is preliminarily screened by the screening plate cooperating with the stirring and heating assembly, and the composite powder is screened again by the composite screening net moving up and down; S4, when the composite screening net moves up, the rotating transmission structure is driven by the extrusion block to rotate the spiral unblocking piece in the screening plate; S5, the composite powder after screening is transported to the powder feeding structure by the conveying assembly, and the composite powder is transported to the molten pool for laser cladding processing by the powder feeding structure.

2. A laser cladding process for shredder knife with composite build-up wear layer as claimed in claim 1 wherein, The stirring and heating assembly comprises: A stirring rod is rotatably arranged on the upper part of the inner side of the powder storage box, and the stirring rod is provided with a plurality of cooperating stirring paddles; A heating sleeve is arranged on the outer wall of the powder storage box and heats the working area of the stirring paddle; The bottom end of the stirring rod is provided with a first scraping piece for scraping the upper end surface of the screening plate.

3. A laser cladding process for a shredder knife with a composite overlay wear layer according to claim 2, characterized in that, A plurality of screening holes are arranged in a circular array on the screening plate; Two spiral unblocking pieces are symmetrically arranged in the screening hole; The spiral unblocking piece is symmetrically provided with a material guide strip connected with the screening hole; Coaxial first support blocks are arranged between adjacent spiral unblocking pieces; A first transmission rod is rotatably arranged in the material guide strip and is in transmission connection with the extrusion block; The first support block is provided with a first bevel gear structure coaxially connected with the first transmission rod and the spiral unblocking piece; The first bevel gear structure is coaxially provided with a second transmission rod for controlling the synchronous rotation of adjacent first transmission rods.

4. A laser cladding process for a shredder knife with a composite overlay wear layer according to claim 3, characterized in that, One end of the first transmission rod is coaxially provided with a second bevel gear structure; The second bevel gear structure is coaxially provided with a first transmission gear; A lifting gear is rotatably arranged in the screening plate and is in meshing connection with the first transmission gear; The lifting gear is in transmission connection with the extrusion block.

5. A laser cladding process for a composite build-up wear layer shredder blade as claimed in claim 4, wherein, A lifting rod is vertically arranged on the extrusion block and is in movable sealing connection with the screening plate; The lifting rod is provided with a lifting rack in meshing connection with the lifting gear; The screening plate is provided with a guide block in guiding connection with the lifting rod; The bottom end of the screening plate is provided with a sealing ring in sealing connection with the lifting rod; The bottom end of the lifting rod is provided with a gravity block in alignment with the extrusion block.

6. A laser cladding process for shredder knife of composite build-up wear layer as claimed in claim 5 wherein, The composite screening net comprises: A first screening net is arranged on the inner side of a moving ring, and the moving ring is in close contact with the inner wall of the powder storage box; A second screening net is provided with an extension structure vertically connected with the bottom end of the moving ring at the upper end; A plurality of extrusion blocks are arranged in a circular array on the inner wall of the moving ring; When the moving ring drives the first screening net and the second screening net to move upward, the extrusion blocks control the spiral unblocking pieces to rotate in the screening hole through the gravity blocks and the lifting rods.

7. A laser cladding process for a shredder knife with a composite build-up wear layer according to claim 6, characterized in that The upper end of the moving ring is provided with a moving rod in close contact with the screening plate; The inner side top surface of the powder storage box is provided with a connecting box in sealing connection with a plurality of moving rods; The connecting box is provided with a moving block connected with the moving rod; The connecting box is provided with a plurality of lead screw transmission structures for controlling the lifting of the moving block; The top end of the lead screw transmission structure is coaxially provided with a second transmission gear; The first transmission rod is coaxially provided with a second bevel gear structure at one end; The second bevel gear structure is coaxially provided with a first transmission gear; A lifting gear is rotatably arranged in the screening plate and is in meshing connection with the first transmission gear; The lifting gear is in transmission connection with the extrusion block. A lifting rod is vertically arranged on the extrusion block and is in movable sealing connection with the screening plate; The lifting rod is provided with a lifting rack in meshing connection with the lifting gear; The screening plate is provided with a guide block in guiding connection with the lifting rod; The bottom end of the screening plate is provided with a sealing ring in sealing connection with the lifting rod; The bottom end of the lifting rod is provided with a gravity block in alignment with the extrusion block. The stirring rod is provided with a rotating gear ring for controlling the synchronous rotation of the second transmission gears.

8. A laser cladding process for a shredder blade with a composite overlay wear layer according to claim 7, characterized in that, The inner lower part of the powder storage box is provided with a material guiding table. The bottom end of the material guiding table is provided with a discharge port. The inner side of the material guiding table is rotatably provided with a spiral discharging element aligned with the discharge port. The spiral discharging element is symmetrically provided with a second scraping element for cleaning the material guiding table.

9. A laser cladding process for a shredder blade with a composite overlay wear layer according to claim 8, characterized in that, The discharge port is provided with a supporting element for rotatably supporting the spiral discharging element. The supporting element is provided with a third bevel gear structure coaxially connected with the spiral discharging element. The bottom end of the powder storage box is provided with a first protective box. The upper part of the outer wall of the powder storage box is provided with a second protective box. The first protective box is provided with a fourth bevel gear structure coaxially connected with the third bevel gear structure. The second protective box is provided with a rotating gear in transmission connection with the second transmission gear. The rotating gear is provided with a fourth transmission rod coaxially connected with the fourth bevel gear structure.

10. A shredder blade of a composite build-up hardfacing, according to the laser cladding process of a composite build-up hardfacing of any one of claims 1-9, characterized in that, It comprises: a hardfacing wear layer composed of a wear-resistant framework and a load-bearing substrate; a transition layer for relieving thermal stress, arranged between the blade body and the hardfacing wear layer.

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