Wholesale homemade crane accessories slewing bearing device price, factory direct sales of homemade crane accessories, small crane slewing bearing is a large bearing that can withstand comprehensive loads, and can withstand large axial, radial loads and overturning moments at the same time. Slewing bearings are also called slewing bearings. Some people also call them: rotating support bearings and slewing bearings. Slewing bearings are widely used in real industries. They are called the joints of machines. They are necessary for machines that require relative rotational motion between two objects and simultaneously bear axial force, radial force, and overturning moment. Important transmission components. With the rapid development of the machinery industry, slewing bearings have been widely used in shipbuilding equipment, engineering machinery, light industrial machinery, metallurgical machinery, medical machinery, industrial machinery and other industries.
The slewing bearing is a new type of mechanical component that has gradually emerged around the world in the past 40 years. It consists of inner and outer rings, rolling elements, etc. At present, the slewing bearings produced in my country are mainly produced by the Ministry of Machinery Industry in the early 1990s. Designate Tianjin Engineering Machinery Research Institute to organize the introduction of design and manufacturing technology from the former Federal German Company. The Ministry of Machinery Industry of the People's Republic of China issued the standard: B/3-"Slewing Bearing Types, Basic Parameters and Technical Requirements" on the day of the year. It was mainly drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Mechanical and Electronics Industry and Xuzhou Slewing Bearing Factory. Later, the national In 2010, the construction machinery standard: ..3- was released. In 2010 and 2012, new machinery industry standards B/3- and B/3- were released.
1. Small crane slewing bearing device
The slewing bearing device of small crane usually adopts rolling bearing type, and its structure is the same as rolling bearing. The main features of this device are compact structure, convenient assembly and maintenance, good dustproof and lubrication conditions, small axial clearance, small rotational resistance and long service life. Because the bearing has an annular structure, the channel in the center provides very convenient conditions for power, information transmission and overall layout between the upper and lower vehicles. However, this device requires the frame and turntable structure to be very rigid to ensure that the rolling elements and raceways of the supporting device are in good contact. In addition, due to the high requirements on materials and processing technology, the cost of rolling bearing type slewing bearing devices is relatively high.
According to the shape of rolling elements, slewing bearing devices can be divided into two types: ball type and rolling type. Each type is divided into single row and double row, roller type and three row type. The large ring gear of the rotary drive device is usually integrated with the seat ring of the supporting device, and is divided into two types: internal meshing and external meshing. When in use, the inner and outer rings of the supporting device are fixed with the frame and the turntable respectively with bolts. Since the rolling elements of the ball-type bearing device are in point contact with the seat ring, while the roller-type bearing device is in line contact, theoretically speaking, the load-bearing capacity of the latter is greater than that of the former. However, considering that the slewing bearing device can withstand upward or downward force, the rollers in the single-row roller slewing bearing device are placed crosswise with each other. Half of the rollers bear the upward force and the other half bear the downward force. In fact, When loaded, only half of the total number of rollers are carried, so for single-row bearing type slewing bearings, the load-bearing capacity of ball type and roller type is not much different. The matching dimensions of this slewing bearing device are relatively precise. During use, care should be taken to prevent external impurities and corrosive fluids from entering the interior of the device, and lubricants must be added regularly as required to ensure the normal use of the device.
The crane slewing platform is also called the upper frame. It is the basis for the installation and connection of power units and various working devices. The front part of the platform is equipped with a lifting arm and control system, the middle and rear parts are equipped with a diesel engine and a biped support for a fixed luffing mechanism, the lower bottom is equipped with an upper seat ring of a slewing support device, and a counterweight box (block) is installed at the rear part.
, Rotary platform
The rotary platform is also called the upper frame. It is the basis for the installation and connection of power units and various working devices. The front part of the platform is equipped with a lifting arm and control system, the middle and rear parts are equipped with a diesel engine and a biped support for a fixed luffing mechanism, the lower bottom is equipped with an upper seat ring of a slewing support device, and a counterweight box (block) is installed at the rear part.
, slewing bearing
In addition to completing the slewing operation, the slewing bearing can also reduce various loads from the upper part and transfer them to the lower support frame. When the slewing platform rotates, it maintains the balance of the fuselage.
Mechanical crane slewing bearing This machine adopts roller jacket slewing bearing. It uses multiple cylindrical or conical rollers with smaller diameters, which are fixed by a race so that the distance between each roller is the same. When rotating, the roller rolls on the raceway and the seat ring also rotates.
Small crane slewing bearing This machine uses a rolling bearing type slewing bearing. It consists of upper and lower seat rings, rolling elements, isolation rings, sealing devices and large ring gears. There are two types of rolling elements: rollers and steel balls. According to the number of rows of rolling elements, there are two types: single row and double row. The single-row type can withstand axial loads, radial loads and overturning moments in different directions. The double-row type can withstand larger axial loads and overturning moments.
Slewing mechanism
The small crane is meshed with the cylindrical gear at the lower end of the vertical axis of the main rotating device and the slewing transmission gear. The clutch drives the slewing pinion to rotate along the slewing gear, causing the slewing platform to rotate accordingly. The hydraulic crane uses a hydraulic motor to drive the rotating pinion through a set of reduction gears to realize the rotation of the fuselage.
2. Introduction to the slewing mechanism of a small crane
After a small crane has been used for many years, the slewing bearing will vibrate and make noise when rotating. In addition to other faults, the entire vehicle needs to be repaired. When repairing the slewing bearing, press The repair procedure is to disassemble the single-row four-point contact ball type. Before disassembly, attach one end of the magnetic dial indicator base to the fixed side of the slewing support, place the dial indicator head against the rotating side of the slewing support, and pull up and down with force. , the gap reaches 3., put the dial indicator in the inner and outer direction to check, the gap is ., such inspection data has seriously exceeded the usage limit, according to the usage regulations, it is necessary to replace the new turntable, but it will cost tens of thousands of yuan. , and the manufacturer cannot promise that the goods will arrive soon, and the small crane must be shut down to wait for parts. In this case, consider taking appropriate technical means to repair it.
To this end, a comprehensive inspection was carried out on the slewing bearing. After disassembly, cleaning, comprehensive inspection and track inspection, it was found that although the track was severely worn, there were no cracks or deep dents, which was caused by normal use. Excessive wear and tear, so the slewing bearing was repaired and resized. The diameter of the track balls was enlarged. The enlarged balls were customized and all the old balls were replaced with new ones. After assembly, the slewing bearing rotates flexibly and the clearance is Normal, the simple repair solution ensures the normal use of the small crane.
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