Crane slewing bearing&excavator slewing bearing slewing ring bearing

Slewing bearing and wheel bearing,some people also called it:slewing bearing,slewing ring bearing or turntable bearing.

Slewing bearing is nearly forty years worldwide emerging new type of mechanical parts, it is composed of inner and outer ring, rolling body, etc, at present, finalize the design production of slewing bearing in China, mainly in the early 80 s by the ministry of machinery industry in tianjin institute of engineering machinery group introduced the former federal republic of Germany Rothe Erde design and manufacturing technology of the company. Released on December 20, 1984 of the People's Republic of China machinery industry standard: JB / 2300-2300 the rotary bearing type, basic parameters and technical requirements, composed mainly of machinery and electronics industry of tianjin engineering machinery research institute, xuzhou hering slewing bearing factory is responsible for drafting, the country then issued standard of construction machinery in 1991: JB36.1-36.3-91, released in 1999 and 2011 successively new machinery industry standard JB / 2300-2300 and JB / 2300-2011.

Slewing bearing, is a kind of comprehensive load to bear a large bearings, can withstand the larger axial and radial load and tilting moment. Slewing ring bearings generally installed with a hole in the gears or gear, grease holes and sealing device, which enable mainframe design compact structure, and guide is simple, easy to maintain. Slewing bearing presence of tooth, tooth and tooth in the four-point contact ball bearing, double row angular contact ball bearing, crossed cylindrical roller bearing, crossed tapered roller bearing and three composite bearings, four row cylindrical roller series, including four-point contact ball bearing has high static load capacity, crossed cylindrical roller with high load capacity, preloaded can make crossed tapered roller bearing bearing has great support stiffness and the rotation accuracy, three rows of cylindrical roller bearing combination height because of the increase to the bearing capacity of bearing, all kinds of power respectively by different race to bear, so under the same stress distribution, the bearing diameter can be significantly reduced, thus make the characteristics of the host more compact is a kind of high bearing capacity of slewing ring bearings. Slewing bearings are widely used in hoisting machinery, mining machinery, construction machinery, port machinery, ship machinery and mechanical precision radar and missile launcher equipment such as large rotary device. At the same time also can according to customer's specific requirements of the design, development, production various special slewing bearing structure.

Rotary bearing usually consists of worm, slewing bearing, shell, motor and other components. Because core part USES the rotary bearing, can also carry axial force and radial force and overturning moment. The form a lot, but the structure of basic same. From left and right, respectively is (partially) : 1. The outer ring (teeth or no teeth) 2. The sealing tape 3. Rolling body (ball or roller) 4. Refueling mouth;From left and right, respectively is (the) : 1. The block 2. Plug pin (3) inner ring (teeth or no teeth) 4. The isolation piece or cage 5. Mounting holes (orifice or light hole).

Rotary bearing in the real industrial application is very extensive, known as: "machine joints", its main applications are widely used in: crane, rail crane, port cranes, deck cranes, metallurgical cranes, container cranes, excavators, filling machine, and CT machine standing wave therapy apparatus, navigation, radar antenna tower, missile launcher, tanks and robots, and revolving restaurant, etc.

Slewing ring bearing model (China standard) has the following parts:

Single row four-point contact ball slewing bearing series (01)

Double rejection diameter ball slewing bearing series (02)

Single row cross roller slewing bearing series (11)

Three row roller slewing bearing series (13)

Single row four-point contact ball slewing bearing (HS series)

Single row cross roller slewing bearing (HJ series)

Single row four-point contact ball slewing bearing (QU,QW,QN series)

Slewing ring bearing model (INA standard) has the following parts:

Four-point contact slewing bearing series (VL)

Four-point contact slewing bearing series (VS)

Four-point contact slewing bearing series (V)

Single row cross roller slewing bearing series (XS)

Single row cross roller slewing bearing series (X)

Rotary bearing noise common with dust and scarred two solutions as below:

(1) the dust acoustic control method of rotary with dust and other foreign bodies, the cyclical vibration happens, the so-called dust, the size of its vibration and noise, and with or without. Dust acoustic control methods: improve the rotary bearing/wheel bearings cleaning method, before installation to bearing, shaft and hole and all parts to match the strict cleaning clean; Remove the foreign body in lubricant; To improve the bearing seal; Avoid the use of material is not pure plastic cage or foreign bodies are embedded.

(2) the scars of sound control method of rotary bearing rolling surface crack, indentation, or rust, if any, will occur like rivet rivet cyclical vibration and noise, the cycle may be fixed but mostly, the corresponding relationship between speed into a scar on the channel occurred in a row, scars on the ball, and the noise with the installation and lubrication condition and have certain changes. This kind of noise control methods: installation not knock when the bearings, bearing and shaft assembly after a load bearing seat when prevent bearing oblique; Inventory to prevent rusting bearing and transport to prevent impact vibration; Using high viscosity of grease.

(3) the lubrication factors cause the noise and its countermeasures of lubricant selection error and lack of lubricant degradation and induration, can lead to rotary bearing/wheel bearing vibration and noise, and the noise without certain regularity. In this case, only to choose suitable lubricant, adjust its lubrication dose, prolong the service life of lubricant and reasonable replacement cycle.

(4) with the host about the noise and its countermeasures of this kind of noise is not a simple caused by bearing, thus single to find reasons from the aspects of bearing is invalid, dealing with host comprehensive attention, when it is necessary to improve the performance of the host. The main narrative in the motor common hum and rack resonant sound.

A. the hum of the motor and its countermeasures: the motor shaft axial vibration will cause A lot of high frequency noise, hum, its frequency and axial vibration frequency is the same, can is A constant change. Hum way to prevent and prevent axial vibration method is the same.

B. bracket resonant sound and its countermeasures: the outer ring quality is inherent vibration caused by axial bearing frame axial bending vibration mode, then called resonant acoustic noise. Increase the preload method can improve the quality of outer ring of the axial natural frequency, resonance condition, reduce the noise.

 Method of extending the bearing’s lifetime

1. The installation is correct, that affects precision, life, performance. And fill the bearing with lubricant after installation.  

2. Don't allow strong impact, such as hammer striking, transfer roller pressure 

3. Use the accurate installation tool, avoid to use cloth kind and short fibers

4. Lubricate the bearing to avoid rust with high quality mineral oil, especially in summer

5. General inspection, such as the surrounding temperature, vibrate, noise inspection 

6. Keep bearing cleaning from dirt, dust, pollutant, moisture. 

7. Bearing should not be ultra cooled.

Sample

Usually by EMS, DHL, UPS, TNT, Fedex. Anyway as you like.Bulk order:Usually by sea.

Delivery

Within 7 days for Sample or below 100 pcs,30-45 days for large quantity.

Warranty

Six months warranty time for the tracker unit from the delivery date leave factory,excluded the accessories.

Payment

It can be through T/T, L/C.

Please inform us when the payment made, so that we are able to arrange the productions ASAP.

WuXi Nengli Bearing Co.Ltd specialize in researching and developing various kinds of high precision, non-noise, long-life bearings, high quality bearings and other machinery & transmission products,and we also can provide OEM service according to the customers’ request.

The advantage of our Product

1).We have manufactured bearings for over 20 years. 

2).The stable annual output was 3000000 sets.

3).Our tech and service team was very powerful and professional.

4).We have our own brand "WRM".

Product actual pictures:

If you need more information about our products,please feel free to contact us. We will do our best to meet your requirment !

Your inquiry related to our product & price will be replied within 24 hours.

OEM projects are highly welcomed. We have professional team here to help.

Wish you a prosperous business with our quality service.