How to maintain the slewing bearing of crane?

www.zys-bearings.comThe slewing bearing of crane is an important joint of crane, so its maintenance is very necessary. For the maintenance of slewing bearing, we should do the following procedures：

Check the bolts on the slewing bearing

1. check the bolts on the slewing bearing visually before each operation of the crane.

2. After the operation of the slewing bearing for the first 100 working hours, we should check whether the bolt is loose or not; check again when operating for 300 working hours; check every 500 working hours thereafter. If bolt is found loose in inspection, please stop the operation and ask the professional technician to check.

3. Fill the slewing bearing with lithium grease before installation.

4. When changing bolts, wipe them clean and fasten them after using retainer; use cranes according to operation manual and lifting performance table; check fastening bolts as required.

Regular check of slewing bearing

1. Check the flexibility of rotation regularly. If noise and impact are found, we should should stop the machine immediately and do troubleshooting.

2. Check whether there are cracks or breakage in the gear ring. 

3. Check the seal condition regularly. If the seal is damaged, replace it in time. 

ZYS support high end precision bearing project to hold commencement ceremony in Dagong science and Technology Industrial Park

Recently, Dagong attract high-end precision bearing project held a groundbreaking ceremony in the science and Technology Industrial Park, county people's Congress Chairman Zhou Zongquan, deputy secretary of Shanghai City, Zhujiajue Town, Qingpu district Party committee and town mayor Qiao Huifeng, Shanghai merchants representatives, Dagang village cadres near 200 people to participate in activities.
The project of high-end precision bearings is supported by Luoyang Bearing Science&Technology Co.,Ltd.. The project covers an area of 39.8 mu with a standard factory building of 32,000 square meters and equipment investment of 32 million RMB. The project mainly produces precision bearings for brands such as automobiles, household appliances and medical equipment. After the project is completed and put into production, an invoice sale of 300 million RMB will be formed. Products are sold to Europe and the United States, Japan and South Korea and other developed countries and regions; enjoy a reputation at domestic and abroad.

ZYS break the monopoly of axle box bearing in foreign countries

The technology of subway bearing has been monopolized by foreign countries all the time. China's long-term dependency on importing of axle box bearings is expected to be broken. To break the foreign monopoly in the field of high-end rail transportation bearings, is China's Luoyang Bearing Science&Technology Co.,Ltd..
 Luoyang Bearing Science&Technology Co.,Ltd. recently accepted the interview of  China Business Times reporter and said: "Our company developed bearings in Beijing Metro Line 8, after 3 years of rigorous operational assessment, passenger test 350,000 km, have successfully passed the experts Accreditation. Testing of the data have reached the relevant national standards and the leading domestic level, they can totally replace imported products. "
 Luoyang Bearing Science&Technology Co.,Ltd. became the first one in rail bearing industry that can be mass production and qualified supplier of R & D and production unit. The move marks ZYS breaking the pattern of foreign monopoly in the field, will replace the import of high-end bearings, ending the era of full import of high-end bearings to fill the gap in the country.

Selection of Cutting Amount for Bearing Bush Processing

Selection of Cutting Amount for Bearing Bush Processing

Selection of Back Engagement
When rough machining, in the case of rigid process system and the power of machine tool, it is necessary to take the larger back engagement to reduce the number of load. During fine processing, the machining accuracy and surface roughness of the parts should be ensured. On the basis of the surface quality requirements, tool materials, work-piece materials and machine tool performance, the cutting volume manual or relevant information is referred to: Coarse car outer contour αp=2mm, half fine car outer contour αp=0.75mm, fine car αp=0.4mm; Rough boring αp=1mm, fine boring αp=0.3mm.
Section of Load
In rough machining, according to the machining material, the size of the tool, the diameter of the work-piece and the determined back engagement, the cutting volume manual or relevant data, combined with the machine tool instruction manual, selecting: Half fine car f=0.15mm/r, fine car f=0.1mm/r, fine boring f=0.1mm/r.

Selection of Spindle Speed
On the grounds of the confirmed back engagement, feed quantity and durability of work-piece and tool material, referring to the cutting amount manual or relevant information, and table look-up, select the cutting speed Vc, coarse car Vc=120m/min, half fine car Vc=130m/min, fine car Vc=140m/min, rough boring Vc=60m/min, fine boring Vc=70m/min, and calculate the spindle speed with formula (2-5).
Vc =πdn/1000        （2－5）
In this formula: n is the revolving speed of the work-piece or cutter (r/min).
Vc is the cutting speed (m/min)
D is the rotary diameter of the work-piece or cutter corresponding to the selected point of cutting edge(mm).
Combined with practical experience, the final spindle speed is determined: Roughing machining n=600 r/min, half fine car n=800 r/min, fine car n=1000 r/min, fine boring n=700 r/min, threading n=500r/min.

High-temperature slewing bearing features

 High-temperature slewing bearing cage is aluminum or copper, seals and lubricants have to be high temperature. Around the temperature can reach 300 degrees. The common slewing ring cage is nylon. The ambient temperature can reach 80 degrees. Ordinary support isolation block most of the use of nylon bar, high temperature can be copper or aluminum, can be selected according to the specific temperature, can also be customized, prior and sales staff to communicate clearly on technical issues.

ZYS One-way bearings

ZYS One Way Bearings are divided into open type and sealed type. The keyway can be machined on the inner ring and outer ring.
ZYS freewheel clutch is mainly used in such applications as speed conversion, reversal preventing, intermittent movement and etc. Working principle is to use friction generated by wedge, spring and such compression elements to transmit torque.
Features: small size, transmitting high torque, smooth combining, high slip combining, working without noise, etc.
Technical parameters of ZYS one way clutches:
Fitted outer raceway diameter: φ30mm～φ150mm
Fitted inner raceway diameter: φ10mm～φ120mm
Minimum mounting width: 15mm～30mm
Rated torque: 60N.m～4000N.m
ZYS freewheel clutches are mainly applied in aero-engine, reducer, starting system and the transmitting system of helicopter. Working speed can reach 30000rpm, and even 45000rpm in special condition.

ZYS Slewing Bearing Testing Process

ZYS Slewing Bearing Testing Process

   1.Examination of semi finished product and parts before enter factory

    2.Examination of rough lathing semi finished product

    3. Examination of inner and outer circle of lathe finish

    4.Examination of rough lathing path

    5.Examination of path induction hardened

    6.Examination of gear process

    7.Examination of lathe finish plane

    8.Examination of ruling

    9.Examination of make mounting hole

    10.Examination of lathe finish path

    11.Examination of fitting

     12.Examination of finished product

     13.The finished product enter into warehouse