The slew bearing is a special structure that can simultaneously bear large axial load, radial load and overturning moment and other comprehensive loads, and integrates multiple functions such as support, rotation, transmission and fixation. Large bearings. Generally speaking, the slew plate bearing itself has mounting holes, lubricating oil and sealing devices, which can meet the different needs of various types of hosts working under different working conditions; on the other hand, the slew plate bearing itself has a compact structure and guides rotation. Due to its convenience, easy installation and easy maintenance, it is widely used in large-scale rotating devices such as lifting and transportation machinery, excavators, construction machinery, port machinery, wind power generation, medical equipment, radar and missile launchers.
Slewing bearings can be roughly divided into the following structural types according to different structural types:
1. Four-point contact ball slewing bearing 2. Double-row four-point contact ball slewing bearing 3 , Crossed cylindrical roller slewing bearing 4. Crossed tapered roller slewing bearing 5. Three-row cylindrical roller combined slewing bearing
Parameter description
Tolerances, clearances of slewable bearings and The clearance complies with JB/T 10471 "Rolling bearings and slewing bearings", and the tolerances and clearances of slewing bearings for wind turbines comply with JB/T 10705 "Rolling bearings and wind turbine bearings". If customers have other special requirements for size, tolerance, and clearance, corresponding products can be provided according to the operating conditions and user requirements. Cage The cage used in slew bearings has different structural types such as integral cage, segmented cage or isolated cage. The integral cage or segmented cage is made of No. 20 steel or ZL102 cast aluminum alloy. The isolated cage is made of polyamide 1010 resin, ZL102 cast aluminum alloy or QA110-3-1.5 aluminum bronze. In recent years, with the continuous development of the material industry, nylon GRPA66.25 has also been popularized and applied in the design of segmented cages. Bearing lubrication: Most slew bearings work under heavy load and low speed conditions. Generally, the lubrication method using grease filled lubrication can achieve extremely satisfactory results. Commonly used greases include calcium-based grease, Lithium-based grease, aluminum-based grease, and high-temperature grease, etc. Users can choose the most appropriate grease according to specific conditions. The sealing of the slewing bearing is to prevent the filled grease from leaking out, and to prevent external dust, impurities and moisture from invading the inside of the bearing and affecting its normal operation. Since most slew bearings operate under heavy loads and low speeds, the sealing types of the bearings adopt two structures: rubber sealing rings and labyrinth seals. The rubber sealing structure itself has the advantages of simple structure, small space occupation, and reliable sealing performance and has been widely used. However, its disadvantage is that at high temperatures, the rubber sealing lip is prone to early aging and loss of sealing properties, so at high temperatures Slewing bearings operating under working conditions should adopt labyrinth seals. Three-row combined roller slewing bearing (slewing bearing) The three-row roller slewing bearing has three separate upper and lower races and radial raceways, so that the load of each row of rollers can be accurately determined and can withstand it at the same time. It is the one with the largest carrying capacity among the four products for various loads. The shaft and radial dimensions are large and the structure is strong. It is especially suitable for heavy machinery requiring larger diameters, such as bucket wheel excavators, wheeled cranes, marine Cranes, ladle slewing and large-tonnage truck cranes and other machinery. Double row angular contact ball slewing bearing (slewing bearing) The double row ball slewing bearing has three races. The steel balls and isolation blocks can be directly discharged into the upper and lower raceways. According to the stress conditions, two rows of steel balls with different diameters are arranged. . This kind of open assembly is very convenient. The load-bearing angle of the upper and lower arc raceways is 90°, which can withstand large axial force and tipping moment. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed. The double row ball slewing bearing has relatively large axial and radial dimensions and a solid structure. It is especially suitable for loading and unloading machinery such as tower cranes and truck cranes that require medium or larger diameters.
Single-row crossed roller slewing bearing (slewing bearing) Single-row crossed roller slewing bearing consists of two seat rings. It has compact structure, light weight, high manufacturing precision, small assembly gap, and high installation accuracy requirements. The rollers are 1:1 cross arrangement, able to withstand axial force, large radial force and overturning moment at the same time. It is widely used in lifting and transportation, engineering machinery and military products. Single row four-point contact ball slewing bearing (slewing bearing) The single-row four-point contact ball bearing slewing bearing consists of two seat rings. It has a compact structure and light weight. The steel ball contacts the arc raceway at four points and can withstand the axial direction at the same time. force, radial force and overturning moment. Rotary conveyors, welding operators, small and medium-sized cranes, excavators and other engineering machinery can be used. Production process flow chart Raw materials → Forgings → Turning → Inspection → Heat treatment → Grinding → Inspection → Quenching and tempering → Fine grinding → Fine grinding →Inspection→Assembly→Assembly and inspection→Packaging→Crating→Transportation→Customer. Material of turntable slewing bearing: 50Mn, 42CRMO, GCR15SIMN, 9CR18MO. Precision of turntable slewing bearing: P0, P6, P5, P4, P2. The accuracy is from low to high, and the price will also be from low to high. Purpose of turntable slewing bearings: 1. Trailers: This type of bearings are used in a variety of situations, the most important of which are in the transportation industry, agricultural trailers, irrigation systems and airport luggage racks. Application on vehicles, transmitting axial load, radial load and torque of bearings. In other applications, they mostly transmit axial loads. Jinyuan specializes in manufacturing slewing bearings for trailers. 2. Wind power: Wind turbine bearings usually include yaw bearings, pitch bearings, and transmission system bearings (main shaft and gearbox bearings). Jinyuan provides customers with yaw bearings and pitch bearings. The yaw bearing is installed at the connection between the tower and the cockpit, and the pitch bearing is installed at the connection between the root of each blade and the hub. Each wind turbine uses one set of yaw bearings and three sets of pitch bearings. 3 Solar: Rotating solar panels are a great solution for increasing energy. Because Jinyuan Bearing has a very compact design, it supplies the largest solar farm in Europe. 4. Medical equipment; The high-precision, low-noise, high-life, and high-reliability series of medical equipment spindle turntable slewing bearings developed by j Jinyuan Bearing have been widely used in gamma knives, CT machines, nuclear magnetic resonance imaging machines, etc. Large medical equipment. 5. Robots: Industrial robots and other equipment. Jinyuan turntable slewing bearings are installed at the joints of the robot. This structure can achieve incredibly high-precision rotational motion.
Edit the packaging of bearings in this section
Bearing packaging is divided into inner packaging and outer packaging. After the bearing is manufactured and passed the inspection, it will be cleaned and rust-proofed, and then placed in the inner packaging to achieve the purpose of waterproofing, moisture-proof, dust-proof, impact-proof, maintaining the quality and accuracy of the bearing, and convenient use and sales. . The inner packaging of bearings is divided into three categories according to the rust-proof period: ①Short-rust-proof period packaging: The rust-proof period is 3 to 6 months, which is suitable for bearings that are shipped in large quantities to the same subscriber and put into use in a short period of time. As agreed by both parties, simple packaging is adopted based on the principle of convenience of use. ② General rust-proof period packaging: The rust-proof period is one year, suitable for general-purpose bearings. ③Long rust-proof period packaging: The rust-proof period is two years, suitable for special and precision bearings. The inner packaging materials of the bearing include polyethylene plastic tube (box), kraft paper, plain and wrinkled polyethylene composite paper, carton, polyethylene or polyethylene plastic film, nylon fastening tape or plastic braided fastening tape, waterproof high-strength plastic tape , sacks, etc. All the above materials must ensure that the materials pass the corrosion resistance test. Principle requirements for the inner packaging method of bearings: ① Miniature bearings: Every 10 to 15 sets of bearings are put into a plastic tube, and every 5 to 10 plastic tubes are put into a carton (or bag or roll). ② Medium and small bearings: Multiple sets of bearings are wrapped in polyethylene film, external kraft paper or polyethylene composite paper; Multiple sets of bearings are packed into a plastic tube (box); Single sets of bearings are packed in polyethylene film bags, folded or Seal the bag and put it into a carton.
③Large bearings: Use polyethylene film or polyethylene composite paper to package a single set, and then put it into a carton; Use a polyethylene film bag to wrap a single set, fold the bag mouth, and then put it into a carton; Single sets to special Plastic box; single set of three-layer wrapping packaging: polyethylene film tape or composite paper tape for the inner layer, fastening tape for the middle layer, and waterproof and permeable plastic tape for the outer layer. ④ Extra large bearings: Single set with three layers of wrapping and packaging (same as above); Single set of four layers of wrapping and packaging: After the above three layers of wrapping and packaging, the outermost layer is wrapped with a layer of linen tape. For separable tapered roller bearings with an outer diameter ≥150mm, the inner and outer components should be lined with polyethylene film before packaging, or the inner and outer components should be packaged separately. For interchangeable cylindrical roller bearings with an outer diameter of ≥150mm, since the complete set packaging is easy to be damaged, the inner and outer components can generally be packaged separately. The general materials and requirements for bearing outer packaging are as follows: ① Double corrugated cartons, the total weight of each box (gross weight) does not exceed 25kg, and the outside of the box is tied with plastic strapping; ② Nail board box (wooden box), the total weight of each box does not exceed 30kg, The outside of the box should be tied with blue steel straps; ③Calcium plastic corrugated boxes, the total weight of each box should not exceed 25kg, and the boxes should be tied with plastic strapping tapes. When putting bearing products with inner packaging into a box, you should first line the box with a plastic bag or plastic film; if there are any gaps in the box, they need to be filled with corrugated paper blocks, paper scraps and other dry materials.
Edit this paragraph Bearing Parts
(1) Overview of Bearing Parts
1. Bearing parts constitute one of the parts of rolling bearings, but do not include all appendix. 2. Bearing ring is an annular part of a radial rolling bearing with one or several raceways. 3. Bearing washer is an annular part of a thrust rolling bearing with one or several raceways. 4. Flat back-up ring: A detachable essentially flat washer with its inner or outer portion used as a rib for the outer or inner ring of a radial cylindrical roller bearing. 5. Inclined retaining ring (separable) A separable ring with an "L" shaped cross-section, using its outer part as a rib for the inner ring of a radial cylindrical roller bearing. 6. Back-up ring A separable ring in a roller bearing with two or more rows of rollers that is used to isolate the two rows of rollers and guide the rollers. 7. Stop ring A single-port ring with a constant cross-section, installed in an annular groove, to position the rolling bearing axially in the housing or on the shaft. 8. Locking ring: A single-port ring with constant cross-section, installed in an annular groove as a back-up ring to keep the roller or cage in the bearing. 9. Spacer ring is an annular part used between two bearing rings or bearing washers or between two half bearing rings or two half bearing washers to maintain the specified axial distance between them. 10. Seal ring: An annular cover composed of one or several parts. It is fixed on one ring or washer of the bearing and contacts another ring or washer or forms a narrow labyrinth gap to prevent lubricating oil from leaking out and foreign objects from intruding. 11. The dust cover is an annular cover, usually stamped from a thin metal plate, fixed on one ring or washer of the bearing, and extending toward the other ring or washer, covering the internal space of the bearing, but not connected with the other ring or washer. Ferrule or gasket contact. 12. Retainer: A part attached to the inner ring or shaft ring, which uses centrifugal force to enhance the ability of the rolling bearing to prevent the intrusion of foreign objects. 13. Rolling elements Balls or rollers rolling between raceways. 14. Cage A bearing part that partially wraps all or some of the rolling elements and moves with them to isolate the rolling elements and usually also guides the rolling elements and keeps them within the bearing.
(2) Structural characteristics of bearing parts
1. Raceway The surface of the load-bearing part of the rolling bearing is used as the rolling track of the rolling elements. 2. Straight raceway: A raceway in which the generatrix in the plane perpendicular to the rolling direction is a straight line. 3. Convex raceway is a basically cylindrical or conical raceway with a continuous slight convex curve in the plane perpendicular to the rolling direction to prevent stress concentration at the contact point between the roller and the raceway. 4. Spherical raceway The raceway is part of the ball surface. 5. Groove The raceway of the ball bearing is groove-shaped, usually with an arc-shaped cross section, and its radius is slightly larger than the ball radius. 6. (Groove) shoulder The side of the groove (roller) track.
7. Rib: A narrow shoulder protruding from the raceway surface and parallel to the rolling direction. It is used to support and guide the rolling elements and keep them in the bearing. 8. Guide cage surface The cylindrical surface of the bearing rings and washers is used to guide the cage in the radial direction. 9. The end face of the ferrule (washer) is the surface of the ferrule (washer) perpendicular to the axis center line of the ferrule (washer). 10. Bearing inner bore: The inner bore of the rolling bearing inner ring or shaft ring. 11. Cylindrical inner bore: The inner bore of the bearing or bearing parts. The generatrix is ??basically a straight line and is parallel to the bearing axis line or the bearing part axis line. 12. Conical inner hole: The inner hole of a bearing or bearing part, the busbar of which is basically a straight line and intersects with the axis of the bearing or the axis of the bearing part. 13. Bearing outer surface: The outer surface of the rolling bearing outer ring or seat ring. 14. Ring (washer) chamfer refers to the surface of the ring (washer) where the inner hole or outer surface of the bearing is connected to one end of the ring. 15. Overtravel groove is a groove or groove opened in the rib or flange root of the bearing ring or bearing washer to facilitate grinding. 16. Sealing (contact) surface The surface in sliding contact with the sealing ring. 17. Seal ring (dust cover) groove Groove used to retain the bearing seal ring (dust cover). 18. Snap ring groove The groove used to retain the snap ring. 19. Lubrication groove is a groove used to transport lubricant on bearing parts. 20. Lubrication holes are holes in bearing parts used to deliver lubricant to rolling elements.
(3) Bearing rings
1. Inner ring The bearing ring with the raceway on the outer surface. 2. Outer ring The bearing ring with raceway on the inner surface. 3. Tapered inner ring The inner ring of a tapered roller bearing. 4. Tapered outer ring The outer ring of a tapered roller bearing. 5. Double raceway tapered inner ring has a double raceway tapered roller bearing inner ring. 6. Double raceway tapered outer ring has a double raceway tapered roller bearing outer ring. 7. Wide inner ring A bearing inner ring that is widened at one or both ends to improve guidance of the shaft in its bore or to provide supplementary locations for mounting fasteners or seals. 8. Locked inner ring A grooved ball bearing inner ring with all or part of the shoulder removed. 9. Locked outer ring A grooved ball bearing outer ring with all or part of the shoulder removed. 10. Stamped outer ring is a ferrule that is stamped from a thin metal plate and is sealed at one end (sealed stamped outer ring) or open at both ends, generally pointing towards the outer ring of the radial needle roller bearing. 11. Flanged outer ring: Bearing outer ring with flange. 12. Aligning outer ring: An outer ring with a spherical outer surface to adapt to the permanent angular displacement between its axis and the axis of the bearing seat. 13. Aligning outer seat ring The ring used to align the outer ring and the seat hole has a spherical inner surface that matches the spherical outer surface of the outer ring. 14. Outer spherical surface The outer surface of the bearing outer ring is part of the ball surface. 15. The rib on the front of the conical outer ring is the rib on the front of the raceway of the conical outer ring, which is used to guide the roller and bear the thrust of the large end face of the roller. 16. Middle retaining ring: A bearing ring with double raceways, such as the middle integral rib of a double raceway conical inner ring.
(4) Bearing washers
1. Shaft washers are bearing washers installed on the shaft. 2. Seat Washer The bearing washer installed in the seat. 3. Middle ring: A bearing washer with raceways on both sides, used between the two rows of rolling elements of a double-row bidirectional thrust rolling bearing. 4. Aligning seat ring is a seat ring with a spherical back to adapt to the permanent angular displacement between its axis center line and the seat axis center line. 5. Aligning seat washer is a washer used between the self-aligning seat ring and the thrust-bearing surface of the shell. Its surface is a concave spherical surface that matches the spherical back of the self-aligning seat ring.
(5) Rolling elements
1. Spherical rolling elements 2. The roller has an axis of symmetry and its cross-section in any plane perpendicular to its axis is circular shaped rolling element. 3. Ball (roller) population All balls (rollers) in a specific rolling bearing. 4. Ball (roller) group A row of balls (rollers) in a rolling bearing.
5. Cylindrical roller The generatrix on the outer surface of the roller is basically a straight line and is parallel to the axis of the roller. 6. Needle rollers are small-diameter cylindrical rollers with a large ratio of length to diameter. The length is generally between 3 and 10 times the diameter, but the diameter usually does not exceed 5mm. Needle roller heads can come in several shapes. 7. Tapered roller The generatrix on the outer surface of the roller is basically a straight line and intersects with the roller axis line. It is generally a truncated cone. 8. (Convex) spherical convex roller The outer surface of the roller is an inward convex arc in the plane containing its axis. 9. Concave roller The outer surface of the roller is a concave arc in the plane containing its axis. 10. Symmetrical spherical roller The outer surface of the convex spherical roller is symmetrical on both sides of the plane passing through the middle of the roller and perpendicular to its axis. 11. Asymmetric spherical roller The outer surface of the convex spherical roller is asymmetrical on both sides of the plane passing through the middle of the roller and perpendicular to its axis. 12. The crown roller is basically a cylindrical or conical roller. The outer surface of the roller is a continuous slightly convex curve in the plane containing the roller axis line to prevent stress from being generated at the end of the contact between the roller and the raceway. concentrated. 13. Modified roller At the end of the outer surface of the roller, its diameter is slightly modified to prevent stress concentration at the end where the roller contacts the raceway. 14. Spiral roller: A roller made of steel rods wound into a spiral shape. 15. Roller end surface: The end surface that is basically perpendicular to the roller axis line. 16. The large end face of the roller is the end face of the large end of the tapered roller or the asymmetric spherical roller. 17. The small end face of the roller is the end face of the small end of the tapered roller or the asymmetric spherical roller. 18. Roller chamfer: The surface connecting the outer surface of the roller to the end surface. (6) Cage 1. Wave-shaped cage includes a rolling bearing cage composed of one or two wavy annular parts. 2. Cage pocket (window) hole is a hole or opening in the cage to accommodate one or more rolling elements. 3. Cage beam is a part of the cage used to separate adjacent cage pockets. 4. Cage claw A cantilever extending from the cage or half-cage. 5. Cage support is generally a cylindrical support that can be used through the axial hole of the roller. 6. Rib-guided cage is a cage that is radially guided (centered) by the shoulder surface on the bearing ring or bearing washer. I've found a professional for you, study hard!