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Cylindrical rollers and raceways are line contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the rib of the ferrule is small, which is suitable for high-speed rotation. According to whether the ring has ribs, it can be divided into NU, NJ, NUP, N, NF and other single row cylindrical roller bearings, and NNU, NN and other double row cylindrical roller bearings. The bearing has a detachable inner ring and outer ring.

Cylindrical roller bearings with no ribs on the inner ring or outer ring, the inner ring and outer ring can move relative to the axial direction, so they can be used as free end bearings. A cylindrical roller bearing with double ribs on one side of the inner ring and outer ring, and a single rib on the other side of the ring, which can withstand a certain degree of axial load in one direction. Steel stamping cages are generally used, or copper alloy car-made solid cages. But there are also some polyamide shaped cages.

According to whether the ring has ribs, there are single row bearings such as NU, NJ, NUP, N, NF, and double row bearings of NNU and NN. The bearing has a detachable inner ring and outer ring. Cylindrical roller bearings with no ribs on the inner ring or outer ring, the inner ring and outer ring can move relative to the axial direction, so they can be used as free end bearings. Cylindrical roller bearings with double ribs on one side of the inner ring or outer ring and single ribs on the other side of the ring can withstand axial loads in one direction to a certain extent.

Cylindrical roller bearings are suitable for double-supported short shafts with good rigidity, shafts that cause axial displacement due to thermal elongation, and machine parts that need to be separated for installation and disassembly. Mainly used in large motors, machine tool spindles, axle boxes, diesel engine crankshafts, and gearboxes for automobiles and tractors.

Flange is otherwise known as flange flange or flange. Flanges are parts that are connected to each other between pipes and are used for connection between pipe ends; they are also useful for flanges on equipment inlets and outlets, And can be used as connection between two equipments, example reducer flanges.

Flange connection or flange joint refers back to the detachable connection of flange, Gasket and bolt as a team of combined sealing structure. Pipe flange refers back to the flange used for piping in the pipeline installation, And used in the equipment refers to the inlet and outlet flange of the equipment. There are holes in the flanges, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets. Flanges are divided into threaded (threaded) flanges, welding flanges and clamp flanges. Flanges are usually used in pairs, and wire welding flanges and welding flanges with a pressure greater than 4 kg can be used for pipes with extremely poor working performance.Add sealing points within the two flanges, immediately after tighten with bolts. Flanges with different pressures have different thicknesses, and the bolts they use are also different. When the water pump and valve are connected to the pipeline, some parts of these equipments are also made into corresponding flange shapes, also called flange connection. All connecting parts that are closed at the same time by using bolts around the two planes are generally called “flanges”. For example, the connection of ventilation pipes, such parts can be called “flange parts”. But this connection is only a part of the equipment, Such as the text between the flange and the pump, it is not easy to call the pump ‘flange parts’. Smaller ones such like valves Wait, always be called ‘flange parts’.

The reducer flange is used for the connection between the motor and the reducer, as well as the connection between the reducer and other equipment.

Due to the good comprehensive performance of the flange, it is widely used in basic projects such as chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power, aerospace, shipbuilding, etc.

The operation of mechanical equipment is closely related to the selection and use of bearings. However, in the process of cement production, due to complex production conditions, many people are not clear about the selection and installation of bearings. So next, I will introduce a special bearing for cement plant, spherical roller bearings for cement plants 232/750CAKF1/W33.

The cement production line is mainly composed of crushing and pre-homogenization, raw meal preparation and homogenization, preheating decomposition, firing of cement clinker, cement grinding and packaging. Bearings mainly include roller press main shaft bearings, vertical mill roller bearings, vertical mill crank arm bearings, cement rotary kiln supporting wheels, retaining wheels and pinion bearings, ball mill main shaft bearings, crusher bearings, etc. Although there are many types of bearings, their main working characteristics are low speed, heavy load and large impact. Therefore, bearings with high load capacity, impact resistance and high reliability are the best choices for enterprises.

Self-aligning roller bearings have a large radial bearing capacity and self-aligning function. They have lower requirements on the machining accuracy of the casing, avoiding installation errors or shaft deflection that affect the use of the bearings, and have high vibration and shock resistance. Spherical roller bearings have two rows of rollers, which mainly bear radial loads and can also bear axial loads in any direction. It has high radial load capacity, especially suitable for working under heavy load or vibration load, but it cannot bear pure axial load. The raceway of the outer ring of this type of bearing is spherical, so its self-aligning performance is good, and it can compensate the coaxiality error. Like self-aligning ball bearings, self-aligning roller bearings also have self-alignment, but due to the large contact surface between the roller and the raceway surface, its friction capacity is much higher than that of self-aligning ball bearings. Since spherical roller bearings also have greater frictional resistance during rotation, the limit speed of this type of bearing is lower than that of ball bearings, but it is different from the line contact between the roller and the raceway in tapered roller bearings. The speed is higher than that of tapered roller bearings.

Spherical roller bearings for cement plants 232/750CAKF1/W33,the Inner diameter of this bearing is 750mm, the outer diameter size is 1360mm, the high degree is 475, and the weight is 3080kg.

The slewing bearing is a large bearing with a special structure that can bear comprehensive loads such as large axial loads, radial loads, and overturning moments at the same time, and integrates multiple functions such as support, rotation, transmission, and fixation.

Slewing bearings are widely used. Construction machinery is the first and most widely used place for slewing bearings, such as earthmoving machinery, excavators, dismantling machines, stackers and reclaimers, graders, road rollers, dynamic compaction machines, rock drilling machinery, roadheaders, etc.Before the slewing bearing is installed, the installation surface of the main engine should be inspected first. It is required that the support should have sufficient strength, the connection surface should be machined, and the surface should be smooth without sundries and burrs. For those that cannot be machined to achieve the required flatness, special plastics with high injection strength can be used as fillers to ensure the accuracy of the installation plane and to reduce vibration.

In addition to various construction machinery, the application range of slewing bearings has gradually expanded, and equipment platforms such as port equipment, metallurgical equipment, and drilling platforms have begun to use slewing bearings to replace the original bearings on a large scale.Port equipment: port cranes, reach stackers;New energy equipment: wind power generation equipment, solar power generation equipment;Metallurgical equipment: metallurgical cranes, ladle turrets, steel grabbers, mud cannons, oxygen blowing devices;Amusement equipment: Ferris wheel, etc.; Airport equipment: airport refueling machine; Military equipment: radar, tanks, etc.; Robots: palletizing robots, welding robots, manipulators; Medical equipment: Gamma Knife; Environmental protection equipment: mud scraper;

Turntable slewing bearing application:

1. Trailer: This type of bearing is used in many occasions, the most important of which are used in the transportation industry, agricultural trailers, irrigation systems and airport luggage racks. In vehicle applications, the bearings transmit axial loads, radial loads and torques. In other applications, they mostly transmit axial loads. LZK specializes in the manufacture of turntable slewing bearings for trailers.
2. Wind power: Wind turbine bearings usually include yaw bearings, pitch bearings, transmission system bearings (main shaft and gearbox bearings). LZK 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 energy: Rotating solar panels are a great solution for increasing energy. Thanks to the very compact design of the LZK bearings, the largest solar farm in Europe is supplied.
4. Medical equipment: The high-precision, low-noise, long-life, high-reliability series of medical equipment spindle turntable slewing bearings developed by LZK Bearing have been widely used in large medical equipment such as gamma knife, CT machine, and nuclear magnetic resonance machine.
5. Robots: industrial robots and other equipment. LZK turntable bearings are installed on the joints of the robot, and this structure can achieve incredibly high-precision rotary motion.

With the prolongation of the running time of wind turbines, due to the harsh environment of wind farms, gearbox failures occur more and more frequently, such as oil leakage, tooth surface pitting, peeling, broken teeth, abnormal wear, bearing running circles, raceway pitting , Peeling and other phenomena.

There are many factors leading to the above defects, including manufacturing factors: gearbox structure design, load calculation, bearing selection, material selection, manufacturing and processing, test run and cleaning before leaving the factory, etc.; operating factors: control strategy, monitoring measures, maintenance methods; environment Factors: climate, changing wind conditions; control factors: if any link is not properly controlled, it will lead to hidden dangers, which will expand from small defects to large defects, causing irreversible damage to mechanical parts.

Therefore, from the factory to the phase-out and scrapping of wind turbine gearboxes, we must use the concept of full-life cycle management to reduce the damage rate and removal rate of the gearbox and shorten the recovery time through careful maintenance and scientific management, so as to achieve long-life and healthy operation of the gearbox. Improve unit utilization.

There are many reasons for the gear box to be damaged and removed from the shelf. Through investigation and data statistics, the defects are mainly manifested as: broken teeth of gears, pitting, wear and peeling of tooth surfaces, broken inner ring gears, damaged and stuck planetary gears, worn bearings, running of inner and outer rings. circle etc. The direct cause of these defects is mainly due to poor contact of the teeth, eccentric loading, excessive local stress, causing micro-cracks and gradually expanding, resulting in burns, pitting, and peeling of the tooth surface, resulting in local fracture of the tooth. The indirect causes of these phenomena may be related to factors such as design and manufacturing, materials and heat treatment, operation and maintenance, control strategies, and the environment. The specific situation of each gearbox will be different, but generally speaking, the initial manufacturing defect is a potential cause. During use, complex loads, improper maintenance, and failure to track and deal with it in time will accelerate the expansion of defects.