Rotor for screen sedimentation centrifuge with carbide wear-resistant layer and preparation method of rotor

Abstract

The invention provides a rotor for a screen sedimentation centrifuge with a carbide wear-resistant layer and a preparation method of the rotor, and belongs to the technical field of centrifugal separation.The rotor for the screen sedimentation centrifuge with the carbide wear-resistant layer comprises a rotary drum and a spiral piece, the spiral piece is arranged on the rotary drum and comprises a spiral blade and a spiral barrel, and the spiral blade is arranged on the spiral barrel. The spiral blade is arranged on the spiral barrel, the spiral piece is used for scraping solid-phase particles deposited on the inner wall of the rotary drum through the spiral blade through rotation, and the spiral piece is used for generating centrifugal force through rotation so that the solid-phase particles in materials can be transferred to the inner wall of the rotary drum under the action of the centrifugal force; and the target part is arranged on at least one of the inner wall of the rotary drum, the spiral blade and the spiral barrel and is used for being in contact with the solid-phase particles. Strong scouring and abrasion of materials can be effectively resisted, the service life of the rotor is remarkably prolonged, the maintenance and replacement frequency of equipment is reduced, and the long-term operation cost of the equipment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal separation, and in particular relates to a rotor for a screen sedimentation centrifuge with a carbide wear-resistant layer and a preparation method thereof. Background Art

[0002] In many fields of modern industry, such as chemical industry, mining, pharmaceutical industry and environmental protection, the separation and purification of materials is a crucial production link. The screen sedimentation centrifuge has been widely used in these fields due to its efficient separation performance. It uses the strong centrifugal force generated by high-speed rotation to separate the solid particles and liquid in the material, thereby meeting the requirements of subsequent production processes. In the field of centrifugal separation technology, the screen sedimentation centrifuge plays an extremely critical role, and the performance of its rotor directly affects the working efficiency and service life of the entire centrifuge. In the prior art, in order to improve the wear resistance of the rotor, the method of attaching alumina ceramic sheets to the spiral and drum surfaces of the rotor is often used.

[0003] However, this traditional protection method has many defects and shortcomings that are difficult to overcome. First of all, the connection between the alumina ceramic sheet and the rotor structure mainly relies on adhesives, and the bonding strength of this connection method is relatively limited. When the centrifuge is running at high speed for a long time and facing a complex and changeable material flushing environment, the ceramic sheet is very likely to fall off. Once the ceramic sheet falls off, the rotor structure will be exposed to harsh working conditions without any protection, which greatly reduces the wear resistance of the rotor, and thus seriously interferes with the normal operation of the centrifuge, greatly shortens its service life, increases the downtime and frequency of equipment maintenance, and brings great challenges to the company's production continuity.

[0004] Secondly, the ceramic material with high alumina content is expensive, and its patch process is complicated and cumbersome, which not only requires professional technicians to operate, but also requires special patch equipment and tools, which undoubtedly makes the manufacturing cost of the equipment rise sharply. From the perspective of long-term operating costs, high material costs and complex maintenance costs (frequent maintenance due to ceramic sheet shedding) have brought heavy economic burdens to enterprises.

[0005] Furthermore, the toughness of alumina ceramics is relatively poor. During the operation of the centrifuge, if it is subjected to a large impact force, such as the presence of hard foreign matter in the material or the impact during the start-up and stop of the equipment, the ceramic pieces are prone to break. The broken ceramic pieces not only lose their wear-resistant protection function, but their fragments may also be mixed into the material, causing pollution to the material quality, further reducing the reliability and stability of the entire centrifugal separation process.

[0006] In addition, the existing rotor wear-resistant protection technology based on alumina ceramic tiles can no longer meet the needs of screen sedimentation centrifuges for efficient, stable and low-cost operation. Summary of the invention

[0007] Based on the problems existing in the prior art, the present invention proposes a rotor for a screen sedimentation centrifuge with a carbide wear-resistant layer and a preparation method thereof, which has high hardness, high wear resistance and good chemical stability. Compared with traditional alumina ceramic sheets, it has better wear resistance, can effectively resist strong erosion and wear of materials, significantly extend the service life of the rotor, reduce the frequency of equipment maintenance and replacement, and reduce the long-term operating cost of the equipment.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a rotor for a screen sedimentation centrifuge with a carbide wear-resistant layer, comprising a drum and a spiral member, wherein the spiral member is arranged on the drum, the spiral member comprises a spiral blade and a spiral cylinder, the spiral blade is arranged on the spiral cylinder, the spiral member is used to scrape off the solid phase particles deposited on the inner wall of the drum through the spiral blade by rotation, and the spiral member is used to generate centrifugal force through rotation so that the solid phase particles in the material are transferred to the inner wall of the drum under the action of the centrifugal force, the carbide wear-resistant layer is arranged on the target part for contacting with the solid phase particles of at least one of the inner wall of the drum, the spiral blade and the spiral cylinder, the carbide wear-resistant layer is formed by a cladding process of carbide powder, and the carbide powder is clad on the rotor surface by a plasma cladding process or a laser cladding process, and the carbide has high hardness, high wear resistance and good The invention has excellent chemical stability and wear resistance compared with traditional alumina ceramic sheets. It can effectively resist strong scouring and wear of materials, significantly extend the service life of the rotor, reduce the frequency of equipment maintenance and replacement, and reduce the long-term operation cost of the equipment. The carbide itself has a certain chemical stability and can resist the erosion of corrosive media such as acid and alkali to a certain extent. For centrifuges that process corrosive materials in the chemical, pharmaceutical and other industries, the rotor of the invention can effectively prevent the structural strength from decreasing and surface damage caused by corrosion. The carbide wear-resistant layer is formed on the surface of the drum and the spiral by plasma cladding or laser cladding technology, which can form a good metallurgical bond between the wear-resistant layer and the substrate. This bonding method is different from the traditional coating bonding, and its bonding force is stronger. Under high-speed rotation, strong vibration and high-stress working conditions, the wear-resistant layer is not easy to fall off.

[0009] Preferably, the drum comprises a large end device, a straight section, a conical section, a screen section and a small end device. The large end device is used to connect the power device and the feeding device of the centrifuge. The straight section provides a relatively stable centrifugal space. Under the action of centrifugal force, the material undergoes preliminary stratification and sedimentation. The conical section is used to guide the flow direction of the material. The screen section is used to screen the material. The small end device is used to discharge the separated solid material. The spiral cylinder has a radial gap with the straight section, the conical section and the screen section. A special manufacturing process is designed for the structural characteristics of different parts of the rotor. From feeding, processing to cladding and assembly, each link is closely coordinated, which not only ensures the processing accuracy and quality of each part of the rotor, but also gives full play to the advantages of the carbide wear-resistant layer, improves the comprehensive performance of the entire rotor, and enables it to better adapt to the complex working conditions of the screen sedimentation centrifuge.

[0010] Furthermore, the large end device of the drum is located at one end of the drum and is connected to one end of the straight section of the drum by bolts. The other end of the straight section of the drum is connected to the conical section of the drum by bolts. The conical section of the drum is further connected to the screen section of the drum by bolts. The screen section of the drum is connected to the small end device of the drum by bolts. The small end device of the drum is used to discharge solid materials. The spiral blades are used to push the materials to move in the centrifuge drum. The large end device of the drum is cast from high-strength aluminum alloy, and a reinforcing rib structure is designed inside to enhance the overall rigidity and stability.

[0011] Preferably, a fixing frame is provided on both sides of the drum screen segment, one side of the fixing frame is fixedly connected to the drum cone segment by bolts, the inner cavity of the fixing frame is movably connected to one end of the drum screen segment, the other side of the drum screen segment extends to the inner cavity of the small end device of the drum, one side of the small end device of the drum is movably connected to the drum screen segment through the fixing frame, one side of the drum screen segment is fixedly connected with a toothed disk, the bottom of the small end device of the drum is fixedly connected with a fixing seat, the bottom of the fixing seat is fixedly connected with a motor, the output end of the motor is fixedly connected with a gear, and the gear is meshed with the toothed disk. Further, the spiral blade is a conical structure, the diameter of one end of the spiral blade is adapted to the straight section of the drum, and the diameter of the other end is adapted to the drum screen segment, the diameter of the middle section of the spiral blade is adapted to the drum cone segment, and further, the surface of the drum screen segment is provided with screen holes, and the shape of the screen holes is a rectangular structure.

[0012] In traditional screen sedimentation centrifuges, the screen is usually fixed, and materials tend to accumulate on the screen under the action of centrifugal force, especially some materials with high viscosity or irregular particle shapes, which tend to block the mesh of the screen and reduce the separation efficiency. The rotation of the drum screen segment causes the material to be constantly stirred and rolled on the screen, making it difficult to form a stable accumulation state, thereby effectively preventing the material from blocking the screen and ensuring that the material can continue to pass through the screen smoothly for separation. The rotation of the drum screen segment changes the material flow field inside the drum. Due to its relatively independent rotation, when it works in conjunction with the drum straight section, drum cone section and other components, it can form a more complex and orderly flow field for the material in the drum.

[0013] Preferably, the spiral blade adopts a variable cross-section twisted structure, from the root to the tip, the thickness of the blade gradually decreases, the width gradually increases, and the twist is at a certain angle along the rotation direction. The surface of the spiral blade is provided with a guide strip, which extends along the length direction of the blade, and its depth and width gradually change from the root to the tip, matching the variable cross-section structure of the blade. The blade adopts a variable cross-section twisted structure, from the root to the tip, the thickness of the blade gradually decreases, the width gradually increases, and the twist is at a certain angle along the rotation direction. This structural design enables the material to be more evenly distributed in the internal space of the rotor after entering the centrifuge, reducing local material accumulation and blockage, and improving the fluidity and separation efficiency of the material. At the same time, the surface of the blade is provided with a guide groove, which extends along the length direction of the blade, and its depth and width gradually change from the root to the tip, matching the variable cross-section structure of the blade. The guide groove can guide the material to flow along a specific path, further optimize the separation process of the material, and reduce the direct impact and wear of the material on the blade.

[0014] Preferably, the inner wall of the drum is provided with a plurality of spoilers distributed along the axial direction of the flow channel, the spoilers are arc-shaped, the curvature of which is adapted to the wall surface of the flow channel, and the surface of the spoilers is coated with the same material as the carbide wear-resistant layer. The spoiler structure is composed of a plurality of spoilers distributed along the axial direction of the flow channel, the spoilers are arc-shaped, the curvature of which is adapted to the wall surface of the flow channel, and the surface of the spoilers is coated with the same material as the carbide wear-resistant layer. The spoilers can destroy the laminar flow state of the material in the flow channel, make the material fully mixed and dispersed, and promote the separation of different components in the material.

[0015] Furthermore, an arc-shaped groove is provided in the inner cavity of the fixed frame, and connecting parts are fixedly connected to both ends of the drum screen segment, and the connecting part extends to the inner cavity of the arc-shaped groove away from the side of the drum screen segment. The connecting part and the arc-shaped groove are slidably connected, and the two ends of the drum screen segment extend to the interior of the arc-shaped groove through the connecting part, so that it can rotate inside the arc-shaped groove, and the purpose of rotating the drum screen segment can be achieved under the drive of the motor.

[0016] Preferably, the carbide wear-resistant layer is formed by cladding carbide powder on the surface of the rotor structure using a plasma cladding or laser cladding process, and the carbide powder is one or more combinations of tungsten carbide, titanium carbide or chromium carbide.

[0017] Preferably, the spiral element and the drum are both made of high-strength alloy steel, and the thickness of the carbide wear-resistant layer formed during the cladding process is 1.5-5.0 mm.

[0018] Furthermore, the inner surface of the drum cone section is provided with a spiral guide protrusion, which can guide the material to flow along a specific path during the centrifugal process, thereby promoting the separation of the material.

[0019] A method for preparing a rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer, comprising the following steps:

[0020] Step S1: manufacturing the spiral component, firstly cutting the steel plates of the spiral cylinder and the spiral blades, rolling the spiral cylinder to the designed shape, pressing the spiral blades through a press machine, and then welding the spiral blades to the spiral cylinder, then performing overall heat treatment to eliminate welding stress and improve material properties, and then machining to achieve the designed dimensional accuracy requirements, and then using plasma cladding or laser cladding process to clad the front, back and outer edge of the blade, and finally grinding the outer edge of the spiral component to make its surface smooth and flat and ensure dimensional accuracy;

[0021] Step S2: The large end fitting of the drum and the small end fitting of the drum are manufactured by first obtaining a blank through a casting process, and then machining the blank to obtain the precise size and shape required for the connection part, the installation part, etc., so as to meet the designed size and shape accuracy requirements;

[0022] Step S3: the production of the drum straight section and the drum conical section, firstly cutting the cylinder steel plate and the flanges at both ends, welding the cylinder steel plate and the flanges at both ends into one, performing heat treatment to eliminate welding stress, and then machining to ensure the dimensional accuracy of the inner diameter, outer diameter and length of the drum straight section and the drum conical section, and then using plasma cladding or laser cladding process to clad the inside of the drum straight section and the drum conical section, and finally grinding the inner diameter to ensure the smoothness and dimensional accuracy of the inner wall;

[0023] Step S4: The drum screen segment is manufactured by first cutting the cylinder steel plate and the flanges at both ends and welding them together, performing heat treatment and machining, opening the required holes on the cylinder, and using plasma cladding or laser cladding technology to clad the inner wall outside the openings. Then, carbide bars are attached to the clad inner wall, and finally the inner diameter is ground to ensure the overall performance and dimensional accuracy of the drum screen segment.

[0024] Compared with the prior art, the rotor for screen sedimentation centrifuge with carbide wear-resistant layer and the preparation method thereof of the present invention have the following advantages and positive effects:

[0025] 1. The rotor for screen sedimentation centrifuge with carbide wear-resistant layer of the present invention and the preparation method thereof adopt plasma cladding or laser cladding process to clad carbide powder on the surface of the rotor. Carbide has high hardness, high wear resistance and good chemical stability. Compared with traditional alumina ceramic sheets, it has better wear resistance and can effectively resist strong erosion and wear of materials, significantly extend the service life of the rotor, reduce the frequency of equipment maintenance and replacement, and reduce the long-term operation cost of the equipment.

[0026] 2. The cladding process used in the screen sedimentation centrifuge rotor with a carbide wear-resistant layer and the preparation method thereof of the present invention can form a good metallurgical bond between the carbide wear-resistant layer and the rotor structure, with high bonding strength and not prone to falling off, thereby improving the reliability and stability of the rotor and ensuring the continuous and efficient operation of the centrifuge.

[0027] 3. The rotor for screen sedimentation centrifuge with carbide wear-resistant layer and the preparation method thereof of the present invention have designed a special manufacturing process for the structural characteristics of different parts of the rotor. From cutting, processing to cladding and assembly, each link is closely coordinated, which not only ensures the processing accuracy and quality of each part of the rotor, but also gives full play to the advantages of the carbide wear-resistant layer, improves the comprehensive performance of the entire rotor, and enables it to better adapt to the complex working conditions of the screen sedimentation centrifuge.

[0028] 4. The screen sedimentation centrifuge rotor with carbide wear-resistant layer of the present invention and the preparation method thereof adopt a carbide wear-resistant layer, such as tungsten carbide, titanium carbide or chromium carbide, which has extremely high hardness. Its hardness value is usually much higher than that of traditional centrifuge rotor materials. When facing materials containing high-hardness particles, it can effectively resist the impact and scouring of particles, greatly reducing the wear on the rotor surface. The wear-resistant layer has good uniformity. By accurately controlling the plasma cladding or laser cladding process parameters, it can ensure that the carbide wear-resistant layer is evenly distributed on various parts of the drum and spiral parts without obvious thickness differences and defects. This allows the rotor to maintain consistent wear resistance as a whole, avoids equipment imbalance and failure due to excessive local wear, and further improves the operating stability and reliability of the centrifuge.

[0029] 5. The carbide itself in the screen sedimentation centrifuge rotor with carbide wear-resistant layer and the preparation method thereof of the present invention has a certain chemical stability and can resist the erosion of corrosive media such as acid and alkali to a certain extent. For centrifuges that process corrosive materials in the chemical, pharmaceutical and other industries, the rotor of the present invention can effectively prevent the structural strength reduction and surface damage caused by corrosion. The carbide wear-resistant layer is formed on the surface of the drum and the spiral part by plasma cladding or laser cladding process, which can form a good metallurgical bond between the wear-resistant layer and the substrate. This bonding method is different from the traditional coating bonding, and its bonding force is stronger. Under high-speed rotation, strong vibration and high-stress working conditions, the wear-resistant layer is not easy to fall off.

[0030] 6. In the rotor for screen sedimentation centrifuge with carbide wear-resistant layer of the present invention and the preparation method thereof, the gear is driven by a motor to rotate, and the gear drives the rotation of the toothed disk, thereby driving the drum screen segment to rotate. A sealing structure is provided at the bearing joint to prevent material leakage. The rotation of the drum screen segment can effectively prevent the material from being blocked on the screen, thereby improving the separation efficiency. At the same time, due to its relatively independent rotational motion, when working in coordination with other drum components, it can further optimize the flow field distribution of the material in the drum, making the material separation process more efficient and uniform.

[0031] 7. Rotor for screen sedimentation centrifuge with carbide wear-resistant layer of the present invention and preparation method thereof In a conventional screen sedimentation centrifuge, the screen is usually fixed and the material is easily accumulated on the screen under the action of centrifugal force, especially some materials with high viscosity or irregular particle shape, which are easy to block the mesh of the screen and reduce the separation efficiency. The rotation of the drum screen segment causes the material to be constantly stirred and tumbled on the screen, making it difficult to form a stable accumulation state, thereby effectively preventing the material from blocking the screen and ensuring that the material can continue to be separated smoothly through the screen. The rotational motion of the drum screen segment changes the material flow field inside the drum. Due to its relatively independent rotation, when it cooperates with the drum straight section, drum cone section and other components, it can form a more complex and orderly flow field in the drum. For example, the material is initially heated by the drum straight section. After the speed is increased, when the material enters the rotating drum screen section, it will be affected by the tangential force generated by the rotation of the screen section, making the flow rate and flow direction of the material in the screen section more uniform, further promoting the separation of solid particles and liquids. This optimized flow field distribution improves the material separation efficiency of the entire centrifuge, making the separation process more efficient and uniform. The rotation of the drum screen section prevents material blockage, which reduces the uneven impact force on the screen during operation. In the case of a traditional fixed screen, material blockage will cause an increase in local pressure and increase the friction between the screen and the material, thereby accelerating the wear of the screen. The rotating screen section avoids this situation and extends the service life of the screen. At the same time, it also reduces the energy consumed to overcome blockage and uneven friction, reduces the energy consumption of the centrifuge, and improves the overall economy of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of a rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to the present invention;

[0033] Figure 2 A three-dimensional schematic diagram of a rotor structure for a screen sedimentation centrifuge having a carbide wear-resistant layer according to the present invention;

[0034] Figure 3 A side perspective schematic diagram of a rotor structure for a screen sedimentation centrifuge having a carbide wear-resistant layer according to the present invention;

[0035] Figure 4 A schematic diagram of the spiral blade structure of a rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to the present invention;

[0036] Figure 5 A schematic diagram of the structure of a drum screen segment of a rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to the present invention;

[0037] Figure 6The present invention is a schematic flow diagram of a method for preparing a rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer.

[0038] Explanation of the reference numerals in the accompanying drawings: 1. spiral blade; 2. spiral cylinder; 3. large end mount of the drum; 4. straight section of the drum; 5. conical section of the drum; 6. screen section of the drum; 7. small end mount of the drum; 8. fixing frame; 9. toothed disc; 10. fixing seat; 11. motor; 12. gear; 13. spoiler. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0041] The present invention adopts the following technical scheme: a rotor for a screen sedimentation centrifuge with a carbide wear-resistant layer, comprising a drum and a spiral member, the spiral member is arranged on the drum, the spiral member comprises a spiral blade and a spiral cylinder, the spiral blade is arranged on the spiral cylinder, the spiral member is used to scrape off solid phase particles deposited on the inner wall of the drum through the spiral blade by rotation, and the spiral member is used to generate centrifugal force through rotation so that the solid phase particles in the material are transferred to the inner wall of the drum under the action of the centrifugal force, the carbide wear-resistant layer is arranged on the target part of at least one of the inner wall of the drum, the spiral blade and the spiral cylinder for contacting with the solid phase particles, the carbide wear-resistant layer is formed by a cladding process of carbide powder, and a special manufacturing process is designed for the structural characteristics of different parts of the rotor. From feeding, processing to cladding and assembly, each link is closely coordinated, which not only ensures the processing accuracy and quality of each part of the rotor, but also gives full play to the advantages of the carbide wear-resistant layer, improves the comprehensive performance of the entire rotor, and enables it to better adapt to the complex working conditions of the screen sedimentation centrifuge.

[0042] By adopting the above technical solution, a spiral is arranged to scrape off the solid phase particles deposited on the inner wall of the drum through the spiral blades through rotation, and the spiral is arranged to generate centrifugal force through rotation so that the solid phase particles in the material are transferred to the inner wall of the drum under the action of the centrifugal force. The spiral blades are welded on the spiral cylinder, and the spiral cylinder is coaxially arranged with the drum and located inside the drum. When the centrifuge is working, the drum rotates at a certain speed difference to achieve the pushing and further separation of the material.

[0043] Furthermore, the drum includes a large end device, a straight section, a conical section, a screen section and a small end device. The large end device is used to connect the power device and the feeding device of the centrifuge. The straight section provides a relatively stable centrifugal space. Under the action of centrifugal force, the material undergoes preliminary stratification and sedimentation. The conical section is used to guide the flow of the material. The screen section is used to screen the material. The small end device is used to discharge the separated solid material. There is a radial gap between the spiral cylinder and the straight section, conical section and screen section of the drum. A special manufacturing process is designed for the structural characteristics of different parts of the rotor. From feeding, processing to cladding and assembly, each link is closely coordinated, which not only ensures the processing accuracy and quality of each part of the rotor, but also gives full play to the advantages of the carbide wear-resistant layer, improves the comprehensive performance of the entire rotor, and enables it to better adapt to the complex working conditions of the screen sedimentation centrifuge.

[0044] The drum's large end is made of high-strength aluminum alloy casting, and its internal design has a reinforcing rib structure to enhance the overall rigidity and stability. The drum's straight section is made of stainless steel by forging. The forging process makes its internal structure more uniform and dense, and has good comprehensive mechanical properties. The drum's cone section is made of titanium alloy, which has the advantages of light weight, high strength and good corrosion resistance. The inner surface of the drum cone section is provided with a spiral guide protrusion, which can guide the material to flow along a specific path during the centrifugal process, avoid the accumulation or blockage of the material in the cone section, and improve the separation efficiency of the material. A layer of nano-tungsten carbide coating is coated on the surface of the guide protrusion. The nano-tungsten carbide coating has extremely high hardness and wear resistance, which can effectively protect the guide protrusion from being worn during long-term contact with the material. The drum screen section uses a special stainless steel wire mesh, which is nitrided to form a nitrided layer with high hardness on the surface, which improves the wear resistance and corrosion resistance of the screen. On the nitrided screen, a layer of thermal spraying is sprayed. Alumina-titanium oxide ceramic coating, the ceramic coating further enhances the wear resistance and corrosion resistance of the screen. At the same time, its porous structure helps the liquid in the material to pass through the screen quickly, improving the separation efficiency. The small end of the drum is made of integral forged alloy steel. Its structural design is compact and can effectively reduce the retention of materials at the end. A removable carbide wear-resistant liner is installed at the part of the small end of the drum that contacts the material. When the wear-resistant liner is worn to a certain extent, it can be easily replaced to reduce maintenance costs. There are tiny grooves on the surface of the wear-resistant liner, which can play a drainage role in the material discharge process, making the material discharge smoother.

[0045] The large end mount and small end mount of the drum are located at both ends of the drum respectively, and are used to connect with other parts of the centrifuge and ensure the installation stability of the drum. The straight section of the drum is the main cylindrical part of the drum, which provides a larger material sedimentation space. The conical section of the drum guides the flow and separation of materials. Its cone angle is designed according to the material characteristics and separation requirements. The screen section of the drum is located at a specific position of the drum, which is used to achieve the initial separation of solids and liquids. The screen aperture is selected according to the particle size of the processed material.

[0046] Preferably, the large end device of the drum is located at one end of the drum and is connected to one end of the straight section of the drum by bolts, the other end of the straight section of the drum is connected to the conical section of the drum by bolts, the conical section of the drum is further connected to the screen section of the drum by bolts, the screen section of the drum is connected to the small end device of the drum by bolts, the small end device of the drum is used to discharge solid materials, the spiral blades are used to push the materials to move in the centrifuge drum, and the large end device of the drum is cast from high-strength aluminum alloy, and a reinforcing rib structure is designed inside to enhance the overall rigidity and stability.

[0047] In another embodiment, fixed frames are provided on both sides of the drum screen segment, one side of the fixed frame is fixedly connected to the drum cone segment by bolts, the inner cavity of the fixed frame is movably connected to one end of the drum screen segment, the other side of the drum screen segment extends to the inner cavity of the small end device of the drum, one side of the small end device of the drum is movably connected to the drum screen segment through the fixed frame, one side of the drum screen segment is fixedly connected with a toothed disk, the bottom of the small end device of the drum is fixedly connected with a fixed seat, the bottom of the fixed seat is fixedly connected with a motor, the output end of the motor is fixedly connected with a gear, and the gear is meshed with the toothed disk. Furthermore, the spiral blade is a conical structure, the diameter of one end of the spiral blade is matched with the straight section of the drum, and the diameter of the other end is matched with the drum screen segment, the diameter of the middle section of the spiral blade is matched with the drum cone segment, and further, the surface of the drum screen segment is provided with screen holes, and the shape of the screen holes is a rectangular structure.

[0048] In traditional screen sedimentation centrifuges, the screen is usually fixed, and materials are easily accumulated on the screen under the action of centrifugal force, especially some materials with high viscosity or irregular particle shapes, which are easy to block the mesh of the screen and reduce the separation efficiency. The rotation of the drum screen segment causes the material to be constantly stirred and tumbled on the screen, making it difficult to form a stable accumulation state, thereby effectively preventing the material from clogging the screen and ensuring that the material can continue to pass through the screen smoothly for separation. The rotation of the drum screen segment changes the material flow field inside the drum. Due to its relatively independent rotation, when it cooperates with the drum straight section, drum cone section and other components, it can form a more complex and orderly flow field in the drum. For example, after the initial acceleration of the drum straight section, the material enters the rotating drum screen section. When the screen mesh rotates, it will be affected by the tangential force generated by the rotation of the screen segment, making the flow rate and flow direction of the material in the screen segment more uniform, further promoting the separation of solid particles and liquids. This optimized flow field distribution improves the material separation efficiency of the entire centrifuge, making the separation process more efficient and uniform. The rotation of the drum screen segment prevents material blockage, which reduces the uneven impact force on the screen during operation. In the case of a traditional fixed screen, material blockage will cause an increase in local pressure and increase the friction between the screen and the material, thereby accelerating the wear of the screen. The rotating screen segment avoids this situation and extends the service life of the screen. At the same time, it also reduces the energy consumed to overcome blockage and uneven friction, reduces the energy consumption of the centrifuge, and improves the overall economy of the equipment.

[0049] Preferably, the spiral blade adopts a variable cross-section twisted structure, and the thickness of the blade gradually decreases and the width gradually increases from the root to the tip, and the blade is twisted at a certain angle along the rotation direction. The surface of the spiral blade is provided with a guide strip, which extends along the length direction of the blade, and its depth and width gradually change from the root to the tip, matching the variable cross-section structure of the blade. The blade adopts a variable cross-section twisted structure, and the thickness of the blade gradually decreases and the width gradually increases from the root to the tip, and the blade is twisted at a certain angle along the rotation direction. This structural design enables the material to be more evenly distributed in the internal space of the rotor after entering the centrifuge, reducing local material accumulation and blockage, and improving the fluidity and separation efficiency of the material. At the same time, the surface of the blade is provided with a guide groove, which extends along the length direction of the blade, and its depth and width gradually change from the root to the tip, matching the variable cross-section structure of the blade. The guide groove can guide the material to flow along a specific path, further optimize the separation process of the material, and reduce the direct impact and wear of the material on the blade.

[0050] Furthermore, the inner wall of the drum is provided with a plurality of spoilers distributed along the axial direction of the flow channel, the spoilers are arc-shaped, and their curvature is adapted to the wall surface of the flow channel, and the surface of the spoilers is coated with the same material as the carbide wear-resistant layer. The spoiler structure is composed of a plurality of spoilers distributed along the axial direction of the flow channel, the spoilers are arc-shaped, and their curvature is adapted to the wall surface of the flow channel, and the surface of the spoilers is coated with the same material as the carbide wear-resistant layer. The spoilers can destroy the laminar flow state of the material in the flow channel, make the material fully mixed and dispersed, and promote the separation of different components in the material.

[0051] An arc-shaped groove is provided in the inner cavity of the fixed frame, and connecting parts are fixedly connected at both ends of the drum screen segment. The connecting part extends to the inner cavity of the arc-shaped groove away from the side of the drum screen segment. The connecting part and the arc-shaped groove are slidably connected. The two ends of the drum screen segment extend to the inside of the arc-shaped groove through the connecting parts, so that it rotates inside the arc-shaped groove. The purpose of rotating the drum screen segment can be achieved under the drive of the motor.

[0052] Furthermore, the spiral blade is a conical structure, the diameter of one end of the spiral blade is adapted to the straight section of the drum, the diameter of the other end is adapted to the screen section of the drum, and the diameter of the middle section of the spiral blade is adapted to the conical section of the drum.

[0053] The spiral is used to scrape off the solid particles deposited on the inner wall of the drum through the spiral blades by rotation, and the spiral is used to generate centrifugal force through rotation so that the solid particles in the material are transferred to the inner wall of the drum under the action of centrifugal force. The spiral blades are welded on the spiral cylinder, and the spiral cylinder is coaxially arranged with the drum and located inside the drum. When the centrifuge is working, the drum rotates at a certain speed difference to achieve the pushing and further separation of the material.

[0054] The surface of the drum screen segment is provided with screen holes, which are rectangular in shape. The screen holes are used to screen the materials, thereby ensuring the screening efficiency of the materials. The screen hole diameter is selected according to the particle size of the processed materials.

[0055] Furthermore, the carbide wear-resistant layer is formed by cladding carbide powder on the surface of the rotor structure by plasma cladding or laser cladding process, and the carbide powder is one or more combinations of tungsten carbide, titanium carbide or chromium carbide.

[0056] It has high hardness, high wear resistance and good corrosion resistance, can effectively resist the erosion and wear of materials, and protect the drum and spiral parts. During the cladding process, by precisely controlling the cladding process parameters such as cladding power, cladding speed, powder feeding rate, etc., a good metallurgical bond is formed between the carbide wear-resistant layer and the drum and spiral parts to ensure that the wear-resistant layer will not fall off during high-speed rotation and strong wear.

[0057] Preferably, the spiral element and the drum are both made of high-strength alloy steel, and the thickness of the wear-resistant layer formed by the carbide wear-resistant layer during the cladding process is 1.5-5.0 mm.

[0058] Furthermore, the inner surface of the drum cone section is provided with spiral guide protrusions, which can guide the material to flow along a specific path during the centrifugal process, thereby promoting the separation of the material.

[0059] A method for preparing a rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer, comprising the following steps:

[0060] Step S1: manufacturing the spiral component, firstly cutting the steel plates of the spiral cylinder and the spiral blades, rolling the spiral cylinder to the designed shape, pressing the spiral blades through a press machine, and then welding the spiral blades to the spiral cylinder, then performing overall heat treatment to eliminate welding stress and improve material properties, and then machining to achieve the designed dimensional accuracy requirements, and then using plasma cladding or laser cladding process to clad the front, back and outer edge of the blade, and finally grinding the outer edge of the spiral component to make its surface smooth and flat and ensure dimensional accuracy;

[0061] Step S2: The large end fitting of the drum and the small end fitting of the drum are manufactured by first obtaining a blank through a casting process, and then machining the blank to obtain the precise size and shape required for the connection part, the installation part, etc., so as to meet the designed size and shape accuracy requirements;

[0062] Step S3: the production of the drum straight section and the drum conical section, firstly cutting the cylinder steel plate and the flanges at both ends, welding the cylinder steel plate and the flanges at both ends into one, performing heat treatment to eliminate welding stress, and then machining to ensure the dimensional accuracy of the inner diameter, outer diameter and length of the drum straight section and the drum conical section, and then using plasma cladding or laser cladding process to clad the inside of the drum straight section and the drum conical section, and finally grinding the inner diameter to ensure the smoothness and dimensional accuracy of the inner wall;

[0063] Step S4: The drum screen segment is manufactured by first cutting the cylinder steel plate and the flanges at both ends and welding them together, performing heat treatment and machining, opening the required holes on the cylinder, and using plasma cladding or laser cladding technology to clad the inner wall outside the openings. Then, carbide bars are attached to the clad inner wall, and finally the inner diameter is ground to ensure the overall performance and dimensional accuracy of the drum screen segment.

[0064] The rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer and the preparation method thereof are further described below in conjunction with specific embodiments.

[0065] In some embodiments, the present invention provides a rotor for a screen sedimentation centrifuge with a carbide wear-resistant layer, comprising a drum and a spiral member, wherein the spiral member is arranged on the drum, the spiral member comprises a spiral blade 1 and a spiral cylinder 2, the spiral blade 1 is arranged on the spiral cylinder 2, the spiral member is used to scrape off solid phase particles deposited on the inner wall of the drum through the spiral blade 1 by rotation, and the spiral member is used to generate centrifugal force by rotation so that the solid phase particles in the material are transferred to the inner wall of the drum under the action of the centrifugal force, the carbide wear-resistant layer is arranged on the target part for contacting with the solid phase particles on at least one of the inner wall of the drum, the spiral blade 1, and the spiral cylinder 2, the carbide wear-resistant layer is formed by a cladding process of carbide powder, the drum comprises a large end device 3 of the drum, a straight section 4 of the drum, a conical section 5 of the drum, a screen section 6 of the drum and a small end device 7 of the drum, and the large end device 3 of the drum is used to The power device and the feeding device of the centrifuge are connected. The straight section 4 of the drum provides a relatively stable centrifugal space. Under the action of centrifugal force, the material undergoes preliminary stratification and sedimentation. The conical section 5 of the drum is used to guide the flow direction of the material. The screen section 6 of the drum is used to screen the material. The small end device 7 of the drum is used to discharge the separated solid material. There is a gap in the radial direction between the spiral cylinder 2 and the straight section 4 of the drum, the conical section 5 of the drum, and the screen section 6 of the drum. The large end device 3 of the drum is located at one end of the drum and is connected to one end of the straight section 4 of the drum by bolts. The other end of the straight section 4 of the drum is connected to the conical section 5 of the drum by bolts. The conical section 5 of the drum is further connected to the screen section 6 of the drum by bolts. The screen section 6 of the drum is connected to the small end device 7 of the drum by bolts. The small end device 7 of the drum is used to discharge the solid material. The spiral blade 1 is used to push the material to move in the centrifuge drum.

[0066] Among them, carbide materials, such as tungsten carbide, titanium carbide and chromium carbide, are widely used in the field of industrial wear resistance due to their extremely high hardness and wear resistance. These materials can not only effectively resist the impact and erosion of high-hardness particles, but also have good chemical stability and can remain stable in corrosive environments such as acid and alkaline.

[0067] In this embodiment, carbide powder is clad on the surface of the centrifuge rotor by plasma cladding or laser cladding process to form a solid wear-resistant layer. Compared with traditional alumina ceramic sheets, this wear-resistant layer has better wear resistance and chemical stability, can significantly extend the service life of the rotor, and reduce the maintenance and replacement frequency of the equipment. Moreover, the cladding process is a key step in the preparation of the rotor. Both plasma cladding and laser cladding are methods of melting carbide powder at high temperature and combining it with the rotor matrix material. These two processes each have their advantages: plasma cladding has high deposition efficiency and applicability, while laser cladding is known for its precise control and small heat-affected zone. During the cladding process, the uniformity and bonding strength of the wear-resistant layer can be ensured by precisely controlling the cladding parameters, such as power, speed and gas flow. This good metallurgical bonding can prevent the wear-resistant layer from falling off under high-speed rotation and high-stress environments, ensuring the reliability and stability of the rotor.

[0068] Among them, according to the structural characteristics of different parts of the centrifuge rotor, during the processing, attention can be paid to the uniform distribution of the wear-resistant layer of the drum and spiral parts. By accurately controlling the plasma cladding or laser cladding process parameters, it is ensured that the rotor maintains consistent wear resistance as a whole, avoiding equipment imbalance and failure caused by excessive local wear.

[0069] It should be noted that the rotor for screen sedimentation centrifuge with carbide wear-resistant layer in this embodiment has wide application potential in multiple industries:

[0070] In one possible case, it can be applied in chemical production, where many processes need to handle materials containing corrosive or high-hardness particles. Traditional centrifuges are prone to failure due to wear and corrosion under such conditions, while the rotor with carbide wear-resistant layer can effectively resist these adverse factors and ensure the long-term stable operation of the equipment.

[0071] In other possible cases, it can be applied in mineral processing. Centrifuges are often used to separate valuable metals or minerals from ores. Since ores usually contain high hardness particles, traditional rotors are prone to wear, while rotors with carbide wear-resistant layers can provide longer service life and higher separation efficiency, reducing the cost of mineral processing.

[0072] In other possible cases, it can be applied in the pharmaceutical industry, where the centrifuge is used to separate drug components or remove impurities. Since the pharmaceutical process has high requirements on the stability and reliability of the equipment, the rotor with a carbide wear-resistant layer can provide higher separation accuracy and longer equipment life, meeting the strict requirements of the pharmaceutical industry. It should be noted that the present application does not specifically limit the application scenarios of the rotor for the screen sedimentation centrifuge with a carbide wear-resistant layer, that is, those skilled in the art can adjust its type according to actual conditions. The above situation is only an exemplary explanation of the forms in which the rotor for the screen sedimentation centrifuge with a carbide wear-resistant layer in this application can be used, but is not limited to the situations described in the above embodiments.

[0073] The large end device 3 and the small end device 7 of the drum are respectively located at the two ends of the drum, and are used to connect with other parts of the centrifuge and ensure the installation stability of the drum. The straight section 4 of the drum is the main cylindrical part of the drum, which provides a larger material sedimentation space. The conical section 5 of the drum plays a role in guiding the flow and separation of materials. Its cone angle is designed according to the material characteristics and separation requirements. The drum screen section 6 is located at a specific position of the drum, and is used to achieve the preliminary separation of solid and liquid. The screen aperture is selected according to the particle size of the processed material.

[0074] The rotating design of the drum screen segment effectively prevents the material from clogging on the screen. The fixed screen in the traditional centrifuge is prone to reduce the separation efficiency due to material accumulation, while the rotating screen segment can continuously stir and roll the material to prevent accumulation and ensure that the material can pass through the screen smoothly for separation.

[0075] Through the rotational motion, the material flow field inside the drum is optimized. After the initial acceleration of the material through the straight section of the drum, when it enters the rotating drum screen section, it is acted upon by the tangential force, and the flow rate and direction are more uniform. This optimized flow field distribution improves the separation efficiency of solid particles and liquids, making the separation process more efficient and uniform.

[0076] The good metallurgical bonding between the carbide wear-resistant layer and the rotor matrix ensures the firmness of the wear-resistant layer. Under high-speed rotation, strong vibration and high-stress working conditions, the wear-resistant layer is not easy to fall off, which significantly improves the operating stability and reliability of the centrifuge. In addition, the rotation of the drum screen segment reduces the uneven impact force on the screen during operation, prolongs the service life of the screen, and also reduces the energy consumed to overcome blockage and uneven friction, reduces the energy consumption of the centrifuge, and improves the overall economy of the equipment.

[0077] In some embodiments, the present application may also include a drum and a spiral element, the spiral element is arranged on the drum, the spiral element includes a spiral blade 1 and a spiral cylinder 2, the spiral blade 1 is arranged on the spiral cylinder 2, the spiral element is used to scrape off the solid phase particles deposited on the inner wall of the drum through the spiral blade 1 by rotation, and the spiral element is used to generate centrifugal force by rotation so that the solid phase particles in the material are transferred to the inner wall of the drum under the action of the centrifugal force, a carbide wear-resistant layer is arranged on the target part of at least one of the inner wall of the drum, the spiral blade 1, and the spiral cylinder 2 for contacting the solid phase particles, the carbide wear-resistant layer is formed by a cladding process of carbide powder, the spiral blade 1 adopts a variable cross-section twisted structure, from the root to the tip, the thickness of the blade gradually decreases, the width gradually increases, and it is twisted at a certain angle along the rotation direction, and a guide strip is arranged on the surface of the spiral blade 1. The flow strip extends along the length direction of the blade, and its depth and width gradually change from the root to the tip, matching the variable cross-section structure of the blade. The inner wall of the drum is provided with a plurality of spoilers 13 distributed along the axial direction of the flow channel. The spoiler 13 is arc-shaped, and its curvature is adapted to the wall surface of the flow channel, and the surface of the spoiler 13 is coated with the same material as the carbide wear-resistant layer. The inner cavity of the fixed frame 8 is provided with an arc-shaped groove, and both ends of the drum screen segment 6 are fixedly connected with a connecting part, and the connecting part extends to the inner cavity of the arc-shaped groove away from the side of the drum screen segment 6, and the connecting part and the arc-shaped groove are slidably connected. The surface of the drum screen segment 6 is provided with screen holes, and the shape of the screen holes is a rectangular structure. The carbide wear-resistant layer is formed by cladding carbide powder on the surface of the rotor structure by plasma cladding or laser cladding process, and the carbide powder is one or more combinations of tungsten carbide, titanium carbide or chromium carbide.

[0078] In some embodiments, the present application may also include a drum and a spiral member, the spiral member is arranged on the drum, the spiral member includes a spiral blade 1 and a spiral cylinder 2, the spiral blade 1 is arranged on the spiral cylinder 2, the spiral member is used to scrape off the solid phase particles deposited on the inner wall of the drum through the spiral blade 1 by rotation, and the spiral member is used to generate centrifugal force by rotation so that the solid phase particles in the material are transferred to the inner wall of the drum under the action of the centrifugal force, a carbide wear-resistant layer is arranged on the inner wall of the drum, the spiral blade 1, and at least one of the spiral cylinder 2 for contacting the solid phase particles. The carbide wear-resistant layer is formed by a cladding process of carbide powder. The spiral member and the drum are both made of high-strength alloy steel. The thickness of the carbide wear-resistant layer formed during the cladding process is 1.5-5.0 mm. The inner surface of the drum cone section 5 is provided with a spiral guide protrusion, which can guide the material to flow along a specific path during the centrifugation process, thereby promoting the separation of the material.

[0079] In some embodiments, a fixing frame 8 is provided on both sides of the drum screen segment 6 of the present application, one side of the fixing frame 8 is fixedly connected to the drum cone segment 5 by bolts, the inner cavity of the fixing frame 8 is movably connected to one end of the drum screen segment 6, the other side of the drum screen segment 6 extends to the inner cavity of the drum small end device 7, one side of the drum small end device 7 is movably connected to the drum screen segment 6 through the fixing frame 8, one side of the drum screen segment 6 is fixedly connected to a toothed disc 9, the bottom of the drum small end device 7 is fixedly connected to a fixing seat 10, the bottom of the fixing seat 10 is fixedly connected to a motor 11, the output end of the motor 11 is fixedly connected to a gear 12, and the gear 12 is meshed with the toothed disc 9 When the centrifuge is started, the motor 11 starts to run, the output shaft of the motor 11 drives the gear 12 to rotate, the gear 12 drives the toothed disc 9 to rotate, the toothed disc 9 is connected to the drum screen segment 6, and the power is transmitted to the drum screen segment 6, thereby driving the drum screen segment 6 to rotate around its axis. In this process, since the drum screen segment 6 is slidably connected with the drum straight segment 4 and the drum cone segment 5, the drum screen segment 6 can rotate relatively independently. At the same time, the sealing structure ensures that during the rotation of the drum screen segment 6, the material will not leak out from the gap, thereby ensuring the normal operation of the centrifuge and the sealing of the material separation process.

[0080] In the case of traditional fixed screens, material blockage will lead to increased local pressure, increase the friction between the screen and the material, and thus accelerate the wear of the screen. The rotating screen segment avoids this situation and extends the service life of the screen. It also reduces the energy consumed to overcome blockage and uneven friction, reduces the energy consumption of the centrifuge, and improves the overall economy of the equipment.

[0081] In some embodiments, the spiral member of the present application may be manufactured as follows.

[0082] First, the steel plates of the spiral barrel 2 and the spiral blade 1 are cut, the spiral barrel 2 is rolled to the designed shape, the spiral blade 1 is pressed by a press, and then the spiral blade 1 is welded to the spiral barrel 2, followed by an overall heat treatment to eliminate welding stress and improve material properties, and then machining is performed to achieve the designed dimensional accuracy requirements, and then plasma cladding or laser cladding processes are used to clad the front, back and outer edge of the blade, and finally the outer edge of the spiral is ground to make its surface smooth and flat and ensure dimensional accuracy. For the production of the large end fitting 3 of the drum and the small end fitting 7 of the drum, the blank is first obtained through a casting process, and then machining is performed to produce the precise size and shape required for the connection part, the installation part, etc., so that it meets the designed size and shape accuracy requirements. For the production of the straight section 4 of the drum and the cone section 5 of the drum, the barrel steel plate and the flanges at both ends are cut, and the barrel steel plate and the flanges at both ends are connected. The flanges are welded together, heat treated to eliminate welding stress, and then machined to ensure the dimensional accuracy of the inner diameter, outer diameter and length of the drum straight section 4 and the drum cone section 5. Then, plasma cladding or laser cladding technology is used to clad the inside of the drum straight section 4 and the drum cone section 5. Finally, the inner diameter is ground to ensure the smoothness and dimensional accuracy of the inner wall. For the production of the drum screen segment 6, the cylinder steel plate and the flanges at both ends are first cut and welded together, heat treated and then machined, the required holes are opened on the cylinder, and plasma cladding or laser cladding technology is used to clad the inner wall outside the opening, and then carbide bars are attached to the clad inner wall. Finally, the inner diameter is ground to ensure the overall performance and dimensional accuracy of the drum screen segment 6. After the spiral and the drum are assembled into one according to the design requirements, they are strictly tested and all performance indicators are qualified, and then the rotor production can be completed.

[0083] In some embodiments, during the production of the spiral component, the steel plates of the spiral cylinder 2 and the spiral blade 1 are first accurately cut according to the design requirements. After the cutting is completed, the spiral cylinder 2 is placed on a rolling device and rolled according to the designed curvature radius to form the shape of the spiral cylinder 2. The spiral blade 1 is press-formed by a special press machine. The press-formed spiral blade 1 is welded to the spiral cylinder 2. The welding parameters must be strictly controlled during the welding process to ensure the welding quality. After the welding is completed, the spiral component is heat treated as a whole to eliminate the stress generated by the welding and improve the organizational structure and performance of the material. After the heat treatment, it is machined to process the key dimensions of the spiral component such as the axial hole and the connection part to ensure its assembly accuracy with other components. Then, plasma cladding or laser cladding equipment is used to clad the carbide powder on the front, back and outer edge of the spiral blade 1 according to the optimized process parameters. After the cladding is completed, the outer edge of the spiral component is ground by grinding equipment to make its surface reach the roughness and dimensional accuracy required by the design.

[0084] For the large end device 3 of the drum and the small end device 7 of the drum, a casting mold is made according to the design drawings, and the molten metal is injected into the mold. After cooling and solidification, a blank is obtained. After the blank is pre-treated by cleaning and grinding, bolt holes, positioning surfaces and other parts connected to other parts are processed by machining equipment to ensure its installation accuracy and connection reliability.

[0085] In the manufacture of the drum straight section 4 and the drum conical section 5, the cylinder steel plate and the flanges at both ends are first cut, and the cylinder steel plate and the flanges at both ends are welded. A suitable welding process and welding sequence are used during welding to reduce welding deformation. After welding, heat treatment is performed to eliminate welding stress. After heat treatment, machining is performed to process the inner diameter, outer diameter and connection parts of the drum straight section 4 and the drum conical section 5, and then plasma cladding or laser cladding process is used to clad the inside of the drum straight section 4 and the drum conical section 5 with carbide powder. After cladding, the inner diameter is ground to ensure the smoothness and dimensional accuracy of the inner wall and reduce the resistance and wear of the material when flowing inside.

[0086] To make the drum screen segment 6, first cut the cylinder steel plate and the flanges at both ends and weld them together, perform heat treatment and then machine processing to obtain the required external dimensions and connection parts, make holes on the cylinder according to the design requirements, and after the holes are made, use plasma cladding or laser cladding process to clad the inner wall outside the holes with carbide powder. After the cladding is completed, apply a high-temperature resistant and high-strength adhesive on the cladding layer, stick the carbide bars on the inner wall, and finally grind the inner diameter to ensure the overall performance and dimensional accuracy of the drum screen segment 6, so that the material can be smoothly screened and separated by sedimentation in the drum screen segment 6.

[0087] During the assembly process of the spiral and the drum, the spiral is installed inside the drum according to the design requirements, the gap and relative position between the two are adjusted, and they are fastened together through bolts and other connecting parts. After the assembly is completed, the rotor is installed on the centrifuge for testing. During the test, the rotor's speed, vibration, temperature rise and other performance indicators are monitored. If all indicators meet the design requirements, the rotor is completed and can be officially put into use.

[0088] The working principle of the rotor for the screen sedimentation centrifuge with carbide wear-resistant layer is as follows: 1. When the screen sedimentation centrifuge is running, the material is first transported to the high-speed rotating drum through the feed pipe. The drum is driven by the centrifuge to rotate at a speed of several thousand revolutions per minute, generating a strong centrifugal force. Under the action of the centrifugal force, the solid particles in the material are quickly thrown to the drum wall. Since the straight section 4 of the drum provides a large sedimentation space, larger particles of solid matter begin to settle initially here.

[0089] 2. With the continuous filling and rotation of the material in the drum, the material gradually moves toward the drum cone section 5. The special shape design of the drum cone section 5 guides the material to further flow and separate, so that the solid particles continue to settle along the wall of the drum cone section 5 and gather toward the small end of the drum 7.

[0090] 3. At the same time, the spiral element inside the drum is also rotating at a relatively small speed difference with the drum. The main function of the spiral element's rotation is to push the solid particles deposited on the drum wall to the drum's small end device 7 for subsequent discharge. During the pushing process, the spiral blade 1 continuously rubs against the material, and the carbide wear-resistant layer on its surface effectively resists this friction and wear.

[0091] 4. When the material passes through the drum screen section 6, the liquid part is thrown out of the drum through the pores of the screen under the action of centrifugal force, achieving the initial separation of solid and liquid. The solid particles are trapped on the inner surface of the screen and continue to be pushed to the discharge port by the spiral element for discharge.

[0092] 5. When the centrifuge is started, the motor 11 starts to run, the output shaft of the motor 11 drives the gear 12 to rotate, the gear 12 drives the toothed disc 9 to rotate, the toothed disc 9 is connected to the drum screen segment 6, and the power is transmitted to the drum screen segment 6, thereby driving the drum screen segment 6 to rotate around its axis. In this process, since the drum screen segment 6 is slidably connected with the drum straight segment 4 and the drum cone segment 5, the drum screen segment 6 can rotate relatively independently. At the same time, the sealing structure ensures that during the rotation of the drum screen segment 6, the material will not leak out from the gap, thereby ensuring the normal operation of the centrifuge and the sealing of the material separation process.

[0093] It can be understood that a series of specific expressions involved in the present invention, such as "multiple", "and / or", "first", "second" and various directional words and "connected" and other terms, all have their unique and rich definitions and are worthy of in-depth analysis and understanding.

[0094] The term "plurality" in the context of the present invention clearly means two or more than two. This definition plays an important guiding role in situations involving quantity description. For example, when referring to "plurality of components", it means that the number of components involved is at least two, which covers all possible quantity situations starting from two components, and provides a broad and clear scope definition for the setting of the number of components in the technical solution. This definition method helps to take into account application scenarios of different scales and complexities during the design and implementation process. Whether it is a relatively simple dual-component combination or a more complex multi-component integrated system, it can be effectively planned and described based on the concept of "plurality".

[0095] Regarding the associative descriptor "and / or". The three relationships it represents provide rich expressions for the diversity of technical solutions. Taking A and / or B as an example, the existence of A alone means that in certain specific operating modes, conditions or application scenarios, only the element A plays a role, and B is not enabled or irrelevant. For example, in the energy-saving mode of a device, it may rely solely on the specific functions of the A component to maintain basic operation in order to achieve the purpose of reducing energy consumption. The existence of A and B at the same time indicates that in most conventional or specific complex working conditions, A and B cooperate and complement each other to jointly achieve technical goals. For example, in a data processing system, A is responsible for the preliminary screening and sorting of data, and B conducts in-depth analysis and mining. The two work together to improve the efficiency and accuracy of data processing. The existence of B alone means that in some special cases, B can independently undertake technical tasks, and A can be temporarily shelved or not involved at all. The existence of these three relationships enables the technical solution to flexibly adapt to different needs and environmental changes, greatly enhancing the adaptability and practicality of the invention.

[0096] Regarding the terms such as "first" and "second", their core purpose is to distinguish the same type of information, rather than to limit a specific order or degree of importance. In the process of explaining the technical solution, the use of these terms helps to clearly sort out the categories of various types of information. For example, when describing the data collected by multiple sensors, they are marked as first sensor data and second sensor data respectively, only to be able to clearly distinguish data from different sources in subsequent data analysis, processing, and technical logic construction, but does not imply that the first sensor data takes precedence over the second sensor data in importance, or that there is a strict order of collection between the two. In fact, without departing from the scope of the present invention, the names of the first information and the second information are completely interchangeable, which fully reflects the flexibility and non-sequential characteristics of these terms in information classification, and avoids misunderstandings and unnecessary restrictions that may arise from the use of terms.

[0097] Such as "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and other directional words. The orientation or position relationship they indicate is based on a relative reference system shown in the accompanying drawings. Its main function is to facilitate a clear description of the present embodiment and simplify the overall description process. Taking the design of a mechanical device as an example, when it is mentioned that a certain component is located "inside" the device, it is relative to the overall external contour of the device. Through this relative orientation description, technicians can quickly understand the approximate position layout of the component in the entire device structure, but it does not mean that the fixed orientation of the component in absolute space is immutable. Similarly, the description of "longitudinal" and "lateral" is also based on the device form or technical process trend presented in the accompanying drawings. In the actual manufacturing, installation or use process, the device may be rotated, inverted or adjusted according to the actual situation of the site, supporting equipment, etc. These directional words provide a relative, easy-to-understand and communicate means of describing the position relationship, rather than a strict orientation limitation of the device or component in the actual space.

[0098] The term "connection" covers a wide range. It includes direct connection without other components between the two. This connection method often has high connection rigidity, stability and direct signal or energy transmission. For example, in some high-precision electronic circuits, the direct welding connection between the chip and the pin can ensure that the signal is transmitted quickly and accurately within the shortest path, reducing signal attenuation and interference. At the same time, "connection" also includes indirect connection with other components between the two. This indirect connection method is very common in complex mechanical systems or large industrial equipment. For example, the power source is connected to the working part through intermediate components such as transmission shafts and couplings. The existence of intermediate components may play a variety of roles such as buffering, speed change, and change the direction of force, so that the entire system can adapt to different working requirements and working conditions. This comprehensive definition of the concept of "connection" enables the flexible selection of appropriate connection methods according to specific functional requirements, structural layout and performance requirements during the design and implementation of technical solutions. Whether it is pursuing efficient and direct connection effects or realizing complex functional integration with the help of intermediate components, it can be effectively planned and operated within the framework of the concept of "connection".

[0099] Description of the operation sequence presented in the accompanying drawings of the technical solution of the present invention. Although the operation process is shown in a specific order in the accompanying drawings, this should not be understood as an absolute and unchangeable execution requirement. In the modern technological environment, especially in the context of increasingly powerful multi-tasking and parallel computing capabilities, the implementation of the technical solution can be flexibly adjusted according to actual conditions. For example, on an automated production line, certain operation steps may be presented as a serial order in the theoretical flow chart, but under the actual intelligent control system scheduling, if the equipment resources permit and do not affect the final product quality and production safety, some operations can be carried out in parallel. The existence of this flexibility enables the invention to better adapt to the comprehensive consideration of multiple factors such as different production scales, equipment configurations, and time cost requirements, avoid problems such as inefficiency or waste of resources due to rigidly following the operation sequence in the accompanying drawings, and give full play to the maximum potential of the technical solution in different application scenarios.

[0100] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the technical concepts disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the following scope of rights.

[0101] It should be understood that the present invention is not limited to the precise structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the scope of the appended claims.

Claims

1. A rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer, characterized in that: It comprises a rotating drum and a spiral member, wherein the spiral member is arranged on the rotating drum; The spiral element comprises a spiral blade (1) and a spiral cylinder (2), wherein the spiral blade (1) is arranged on the spiral cylinder (2), and the spiral element is used to scrape off solid phase particles deposited on the inner wall of the drum through the spiral blade (1) by rotating, and the spiral element is used to generate centrifugal force by rotating so that the solid phase particles in the material are transferred to the inner wall of the drum under the action of the centrifugal force; The carbide wear-resistant layer is arranged on at least one of the inner wall of the drum, the spiral blades (1) and the spiral cylinder (2) and is used for the target part in contact with the solid phase particles. The carbide wear-resistant layer is formed by a cladding process using carbide powder.

2. The rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to claim 1, characterized in that: The drum comprises a large end device (3), a straight section (4), a conical section (5), a screen section (6) and a small end device (7); The large end device (3) of the drum is used to connect the power device and the feeding device of the centrifuge; The straight section (4) of the drum provides a relatively stable centrifugal space, where the material undergoes preliminary stratification and sedimentation under the action of centrifugal force; The drum cone section (5) is used to guide the flow direction of the material; The rotary drum screen segment (6) is used to screen the material; The small end portion of the drum is equipped with (7) for discharging the separated solid materials; There is a gap in the radial direction between the spiral cylinder body (2) and the drum straight section (4), the drum conical section (5) and the drum screen section (6).

3. A rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to claim 2, characterized in that: The drum large end device (3) is located at one end of the drum and is connected to one end of the drum straight section (4) by bolts; The other end of the drum straight section (4) is connected to the drum cone section (5) by bolts, and the drum cone section (5) is further connected to the drum screen section (6) by bolts; The drum screen segment (6) is connected to the drum small end device (7) by bolts, and the drum small end device (7) is used to discharge solid materials; The spiral blade (1) is used to push the material to move in the centrifuge drum.

4. The rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to claim 2, characterized in that: A fixing frame (8) is provided on both sides of the rotary drum screen segment (6); one side of the fixing frame (8) is fixedly connected to the rotary drum cone segment (5) by bolts; the inner cavity of the fixing frame (8) is movably connected to one end of the rotary drum screen segment (6); the other side of the rotary drum screen segment (6) extends to the inner cavity of the rotary drum small end device (7); one side of the rotary drum small end device (7) is movably connected to the rotary drum screen segment (6) by the fixing frame (8); one side of the rotary drum screen segment (6) is fixedly connected to a toothed disc (9); the bottom of the rotary drum small end device (7) is fixedly connected to a fixing seat (10); the bottom of the fixing seat (10) is fixedly connected to a motor (11); the output end of the motor (11) is fixedly connected to a gear (12); the gear (12) meshes with the toothed disc (9); The inner cavity of the fixed frame (8) is provided with an arc-shaped groove, and both ends of the rotary drum screen segment (6) are fixedly connected with connecting parts, and the connecting part extends to the inner cavity of the arc-shaped groove away from the side of the rotary drum screen segment (6), and the connecting part and the arc-shaped groove are slidably connected.

5. The rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to claim 1, characterized in that: The spiral blade (1) adopts a variable cross-section twisted structure. From the root to the tip, the thickness of the blade gradually decreases, the width gradually increases, and the blade is twisted at a certain angle along the rotation direction. The surface of the spiral blade (1) is provided with a guide strip, which extends along the length direction of the blade. The depth and width of the guide strip gradually change from the root to the tip, matching the variable cross-section structure of the blade.

6. The rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to claim 1, characterized in that: The inner wall of the drum is provided with a plurality of spoilers (13) distributed along the axial direction of the flow channel. The spoilers (13) are arc-shaped, and their curvature is adapted to the wall surface of the flow channel. The surface of the spoilers (13) is coated with the same material as the carbide wear-resistant layer.

7. The rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to claim 1, characterized in that: The spiral blade (1) is a conical structure, the diameter of one end of the spiral blade (1) is adapted to the straight section (4) of the drum, the diameter of the other end is adapted to the screen section (6) of the drum, and the diameter of the middle section of the spiral blade (1) is adapted to the conical section (5) of the drum.

8. The rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to claim 1, characterized in that: The carbide wear-resistant layer is formed by cladding carbide powder on the surface of the rotor structure using a plasma cladding or laser cladding process. The carbide powder is one or more combinations of tungsten carbide, titanium carbide or chromium carbide.

9. The rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer according to claim 1, characterized in that: The spiral element and the drum are both made of high-strength alloy steel, and the thickness of the carbide wear-resistant layer formed during the cladding process is 1.5-5.0 mm.

10. A method for preparing a rotor for a screen sedimentation centrifuge having a carbide wear-resistant layer, characterized in that: The following steps are involved: Step S1: manufacturing the spiral component, firstly cutting the steel plates of the spiral cylinder (2) and the spiral blade (1), rolling the spiral cylinder (2) to the designed shape, pressing the spiral blade (1) by a press machine, and then welding the spiral blade (1) to the spiral cylinder (2), then performing overall heat treatment to eliminate welding stress and improve material properties, and then machining to achieve the designed dimensional accuracy requirements, and then using plasma cladding or laser cladding process to clad the front, back and outer edge of the blade, and finally grinding the outer edge of the spiral component to make its surface smooth and flat and ensure dimensional accuracy; Step S2: The drum large end fitting (3) and the drum small end fitting (7) are manufactured by first obtaining a blank through a casting process, and then machining the blank to obtain the precise size and shape required for the connection part, the installation part, etc., so as to meet the designed size and shape accuracy requirements; Step S3: the drum straight section (4) and the drum conical section (5) are manufactured by first cutting the cylinder steel plate and the flanges at both ends, welding the cylinder steel plate and the flanges at both ends into one piece, performing heat treatment to eliminate welding stress, and then machining to ensure the dimensional accuracy of the inner diameter, outer diameter and length of the drum straight section (4) and the drum conical section (5). Then, plasma cladding or laser cladding is used to clad the inside of the drum straight section (4) and the drum conical section (5). Finally, the inner diameter is ground to ensure the smoothness and dimensional accuracy of the inner wall. Step S4: The drum screen segment (6) is manufactured by first cutting the cylinder steel plate and the flanges at both ends and welding them together, performing heat treatment and machining, opening the required holes on the cylinder, and using plasma cladding or laser cladding to clad the inner wall outside the openings. Then, carbide bars are attached to the clad inner wall, and finally the inner diameter is ground to ensure the overall performance and dimensional accuracy of the drum screen segment (6).

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