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What are the classification of gear?

Gears can be classified according to tooth shape, gear shape, tooth line shape, tooth surface and manufacturing method. 1. Gears can be classified according to tooth profile, tooth profile curve, pressure angle, tooth height and displacement. 2. Gears are divided into cylindrical gears, bevel gears, non-circular gears, racks, worm-worm gears according to their shapes. 3. According to the shape of the tooth line, gears are divided into spur gears, helical gears, herringbone gears, and curved gears. 4. According to the surface gear where the gear is located, it is divided into external gear and internal gear. The tooth top circle of the external gear is larger than the tooth root circle; while the tooth top circle of the internal gear is smaller than the tooth root circle. 5. According to the manufacturing method, gears are divided into casting gears, cutting gears, rolling gears, sintering gears, etc.

2023

What are the application areas of slewing bearings?

What are the application areas of slewing bearings 1. ship crane In the ship crane is commonly used in double-row reducing ball, four-point contact ball, three-row roller inner tooth structure of the turntable bearings, including three-row roller turntable bearings are mainly used in heavy cranes, four-point contact ball turntable bearings and double-row reducing ball turntable bearings are used in light cranes. 2. port crane Port cranes generally use three-beat roller slewing bearings with a diameter of 4 meters, which can be used to withstand large overturning forces. slewing bearing 3. wind power generator The service life of the wind turbine is required to be 20 years, and the installation cost of the bearing is higher, so the service life of the yaw and pitch bearings is required to exceed 20 years. The base hardness of the bearing ring is between 240 and 280 HB, which can withstand the impact without plastic deformation. At the same time, the surface hardening hardness of the raceway can reach 55 to 62 HRC, which can improve the contact fatigue life and ensure the service life of the bearing. 4. ladle turret Slewing bearings are generally three-row roller type, because of its poor working environment, high temperature, high performance requirements for fixtures, lubricants, seals, etc.

2023

Causes and preventive measures of broken teeth of slewing bearing

Causes of broken teeth of 1. slewing bearing 1. Aspects of production (1) The strength of the material used in the bearing production process is insufficient or there are a large number of non-metallic inclusions in the metal structure, which will affect the rigidity of the bearing material. (2) The heat treatment quenching process of the bearing can improve the strength, toughness, wear resistance and fatigue strength of the bearing. If the heat treatment process is not good, the performance of the bearing may be affected. For example, the heating temperature is too high, which makes the carbon concentration of the surface carburized layer too high, forming angular block and network carbide structure. However, the subsequent quenching and heating process temperature is too low to eliminate it, resulting in increased brittleness of carburized layer surface, the service life of the gear is reduced. 2. Installation (1) Poor meshing: Improper adjustment of the backlash of the large and small gears during bearing installation, and poor meshing may cause tooth breakage. (2) Meshing gap adjustment: The meshing gap adjustment of the tooth jump and the pinion is not adjusted according to the requirements, resulting in the gear and the large gear during operation when the tooth jump position is large, the gear is stuck and the tooth is broken. (3) the gear axis is not parallel: after the installation of the size of the gear meshing, resulting in broken teeth. (4) bolt loosening: slewing bearing installation bolt fastening is not firm, the size of the gear meshing is poor, resulting in broken teeth. 3. Aspects of use (1) Abnormal operation: tooth breakage caused by violation of relevant equipment operation procedures, overload high-speed rotation or host collision with obstacles, etc. (2) Foreign matter stuck: when the slewing bearing meshes with the pinion, foreign matter is stuck, causing tooth breakage. The broken teeth of the slewing bearing are irreversible and need to be replaced. After the reasons for the broken teeth of the slewing bearing are clear, we should summarize the corresponding experience to prevent the occurrence of broken teeth.

2023

How to remove the slewing bearing? Bearing disassembly method and matters needing attention

Disassembly method of 1. slewing bearing 1. Normal clearance fit Under the condition that the support size is designed normally, the clearance fit of the bearing can be removed by tapping or pulling out with copper rod or other soft metal smaller than the inner diameter of the bearing at the end of the shaft, or the bearing can be slowly pulled out and removed by using a special puller as long as the direction is aligned. 2, the inner ring interference situation For bearing disassembly can not be separated from the tool, small size turntable bearing regular tool of choice is the puller. Divided into two kinds of thread and hydraulic. Thread puller is a more traditional tool. Its operation is to align the center screw with the center hole of the shaft, apply a small amount of grease to the center hole of the shaft for lubrication, hook the hook on the end face of the inner ring of the bearing, and twist the center rod with a wrench to pull out the bearing. The hydraulic puller uses a hydraulic device instead of the thread. When the piston in the middle is continuously extended during pressurization, the bearing will be continuously pulled out, which is faster than the traditional threaded puller and the hydraulic device can quickly retreat. When there is a large number of small size bearings need to be disassembled, you can also use the rapid disassembly of the hydraulic device. 3. The interference fit of the outer ring The premise of removing the bearing under the condition of interference fit of the outer ring of the bearing is that the diameter of the outer ring stop shoulder cannot be less than the supporting diameter required by the bearing. It can be considered to leave two to three notches at the bearing seat step position in the bearing design stage to facilitate the puller claws to have focal points and facilitate disassembly. When the bearing is large or the amount of interference is large, the flexible coil induction heating method can be used to disassemble by heating the outer diameter of the box body, using the principle of thermal expansion and contraction.

2023

What are the installation steps of rotary drive?

1. Swing Drive Installation 1. Preparation before installation Before installation, the rotary drive requires personnel to check whether the device is physically damaged. Clean the rotary reducer and the connecting bracket; Remove impurities such as iron filings, paint, burrs or welding slag on the supporting surface. Use diesel or gasoline cleaning fluid to clean the anti-rust oil on the installation surface, and can not damage the performance of the rubber seal.

2023

Gear rack main classification and selection of the use of the need to pay attention to matters

The classification of the rack can be classified according to the tooth shape, gear shape, tooth line shape, manufacturing process and other methods. 1. Gears are divided into cylindrical gears, straight teeth and helical teeth according to their shapes; 2. According to the shape of the tooth line, the gears are divided into spur gears, helical gears and herringman gears; 3. According to the process, it can be divided into quenching, quenching and tempering, grinding, milling and grinding, which can be blackened according to the demand Matters needing attention when choosing to use 1. Whether the gear runout, full tooth depth, common normal line, tooth direction are qualified or not, and whether the circumferential error is out of tolerance. 2. Whether the installation distance of gear and rack is appropriate. 3, rack, gear meshing clearance should be 0.25 * modulus. 4. Whether the full tooth depth, runout and common normal of the rack, especially the tooth direction, are qualified.

2023

Classification and characteristics of rack

The rack is also divided into straight tooth rack and helical tooth rack, which are paired with straight tooth cylindrical gear and helical tooth cylindrical gear respectively; the tooth profile of the rack is straight line instead of involute (for the tooth surface, it is plane), which is equivalent to the main characteristics of the cylindrical gear rack with infinite radius of indexing circle 1. Since the rack tooth profile is a straight line, each point on the tooth profile has the same pressure angle and is equal to the inclination angle of the tooth profile. This angle is called the tooth profile angle, and the standard value is 20 °. 2. Any straight line parallel to the tooth top line has the same pitch and modulus. 3. The straight line parallel to the tooth top line and the tooth thickness is equal to the tooth groove width is called the index line (center line), and the rack is the reference line for calculating the rack size. The main parameters of the rack: Slot width, tooth top height, tooth root height, tooth height, tooth thickness, tooth root circle radius, etc.

2023

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