Archive for category: Knowledge

Introduction

Spring bush bearings, also known as spring roller bearings, find widespread use in various applications. One of the most typical areas of application is the steel industry. These bearings are employed in various components, including:

1. Rollers in Steel Mills: In rolling mills, spring bush bearings support the rollers that shape and process steel sheets.
2. Continuous Casting Machines: Spring bush bearings are used for supporting the guide rollers and directing rollers in continuous casting machines.

3. Furnace Equipment: Inside furnaces or refining equipment, spring bush bearings are utilized for the rollers that handle hot materials.

   Construction and Components

   The construction of spring bush bearings is relatively straightforward. They consist of three main components:

   1. Inner Ring: The inner ring provides the mounting surface for the bearing.
   2. Rolling Elements: These typically include cylindrical rollers with a retaining cage. The rolling elements facilitate smooth rotation.
   3. Outer Ring: The outer ring encloses the entire assembly and provides stability.

   These basic elements can be assembled to create various types of bearings, depending on specific requirements. Whether the application involves split bearing housings, high-temperature operations, or axial load transmission, spring bush bearings can adapt. They handle impact loads and minor misalignments with ease, making them versatile even when multiple challenges arise simultaneously. Additionally, these bearings exhibit excellent wear resistance.

   

   Elasticity and Tolerance

   One notable feature of spring bush bearings is their inherent elasticity. The slight clearance between the inner and outer rings allows them to maintain functionality even under conditions like bending deformation. This property makes them particularly suitable for continuous casting machines and high-temperature transfer equipment.

   Advantages of Spring Bush Bearings

   1. Robust Design: Spring bush bearings share a similar height profile with needle roller bearings but offer greater durability. They can withstand temperature variations, contamination, and inadequate lubrication.
   2. Tolerance to Deviations: These bearings tolerate deviations and inclinations, making them ideal for challenging environments.

   3. Application Range: Spring bush bearings find applications beyond the steel industry. They are also used in mining, cement, and other heavy-duty sectors.

The pressure roller bearings are mainly used in the continuous furnaces of sintering plants. They are massive bearings ready to be fixed. They are used with heavy loads and where the rotation reverses continuously at low speed.
The outer ring shows three entire borders, one section and one outer surface which is highly resistant to wear.
The inner ring is made of two parts, each one has an entire border expressly developed in order to bear high axial thrusts, in addition to radial loads.
Pressure roller bearings do not need maintenance.
The outer ring and the inner ring are manufactured in GCr18Mo steel.
Hardness 60-2 HRC.
In order to increase the resistance to wear, pressure roller bearings usually undergo bainitic temper treatment up to 250° C, named S2.
The sealing system foresees the presence of Viton O-rings, which are inserted in the proper grooves on the inner ring. The seals allow the bearing to be disassembled, they prevent the entrance of contaminating agents and in the meantime, the leakage of lubricant.

Code	d	D	B	Load ratings
				C (KN)	Co (KN)
PRB88x170x95	88	170	95	384	908
PRB93x170x95	93	170	95	384	908
PRB93x171x95	93	171	95	384	908
PRB110x200x90	110	200	90	414	841
PRB110x210x110	110	210	110	479	942
PRB110x300x87/133	110	300	87/133	604	1022
PRB120x190x130	120	190	130	580	1570
PRB120x210x113.8	120	210	113.8	584	1268
PRB120x210x114	120	210	114	584	1268
PRB128.665x210x101.6	128.665	210	101.6	393	1132
PRB128.665x210x114	128.665	210	114	463	1395
PRB130x210x132	130	210	132	529	1659
PRB130x250x132	130	250	132	899	1664
PRB140x250x114	140	250	114	769	1601
PRB140x250x130	140	250	130	899	1957

Cam followers (stud-type track rollers) are designed to run on tracks and to be used in cam drives, conveyor systems, etc. They are based on either needle or cylindrical roller bearings. Instead of an inner ring, they have a threaded solid stud (pin).

Features and benefits:

1. Accommodate high radial loads
2. Accommodate axial loads
3. Long service life
4. Easy to mount

NUKR35, NUKR40, NUKR47, NUKR52, NUKR62, NUKR72, NUKR80, NUKR85, NUKR90, NUKR100, NUKR110

 

The slewing drive is a complete system assembly that can be easily installed and integrated into existing system programs.

It is composed of ball slewing bearing or cylindrical roller slewing bearing, worm, shell and other parts that can bear axial, radial and overturning moments at the same time. The worm is driven by a hydraulic motor or motor to drive the slewing bearing to rotate. The surface of the housing is spray-coated and fully enclosed with seals to protect the slewing drive from contamination, damage and grease loss.

These components are assembled together to avoid customers installing various mating components, and we can also provide a variety of size standards.

The outstanding advantages of the slewing drive are as follows:
• The design is very compact, suitable for installation of mechanical equipment with limited space.

• Very high load carrying capacity in a very compact design.

• long lasting.

• Low maintenance costs.

• Cast housing protects internal parts.

Slewing drives are used worldwide for:
• Vehicle and crane systems.

• Rotation of attachments such as excavators, hydraulic tongs and forklifts.

• Facility management (automated systems).

• Loading and unloading equipment.

• Positioning Systems.

The rotary motion of the slewing drive is driven by a hydraulic motor or an electric motor. It is easy to find a matching hydraulic motor in the market, and it also conforms to industry standards, which can save a lot of time. For the motors, however, some device adapters are also required.

The housing of the slewing drive is a cast part and can be dimensioned according to customer requirements. The closed housing protects the swing system from contamination, damage and grease loss, ensuring smoother operation and longer life of the swing drive.

Additionally, labyrinth seals mounted on the housing structure protect the interior of the assembly from contamination if the swing drive is used in wet or dirty environments. Because the performance and reliability of the slewing drive depends to a large extent on the internal stability. It is worth noting that high-pressure water guns cannot be used to clean the swing drive, as the pressurized water will penetrate the seal and enter the inside of the swing drive, which will greatly reduce the service life.

Slewing drives can be used in temperatures ranging from -20°C to 70°C.

Proper and regular lubrication is required to ensure stable operation and long service life of the slewing drive. Grease is conducive to the better functioning of the rotary drive, reducing wear, reducing noise during operation, extending service life and reducing heat generation.

Periodically lubricate with a grease compatible with the seal material, depending on the frequency of use and ambient operating conditions.

It is best to fill the slewing drive with the same lubricating oil that was originally used. If you wish to use another type of grease, you must verify that the grease is compatible with the originally used grease. In addition, regular relubrication is recommended during operation and after extended periods of non-use or cleaning.

Grease that has been aged but not used should be replaced if it has not been used after three years. Also, greases must not be mixed with different thickeners and base oils.