T4AR2060 Tandem Bearings in Twin Screw Extruder Gearboxes Tandem Bearings in Twin Screw Extruder Gearboxes

 Tandem thrust cylindrical roller bearings with small radial cross section size, compact structure, large axial load capacity, each column roller uniform load, wear resistance, small vibration noise and long life and other characteristics, is the ideal of parallel twin screw extruder screw spindle bearing.Users according to screw center distance, space and load size in our company to choose two, three, four, five, six, seven or eight columns tandem bearings.Tandem bearing DescriptionTandem 2 rows(T2AR), Tandem 3 rows(T4AR), Tandem 6 rows(T6AR), Tandem 7 rows(T7AR), Tandem 8 rows(T8AR)* Tandem thrust bearings are produced by only through ordersTandem Thrust Bearings tolerance of housing - F7Tandem Thrust Bearings tolerance of axis - F6TandemThrust Bearings can receive heavy load in a limited space and support firmly in the direction of axis and last long with low frictional power. In addition, these bearings are moved by oil lubrication. Also thesetandem thrust bearings are used principally in gear boxes for single & twin screw extruders in the rubber and plastic industries.Tandem Thrust bearings are also known as “Multi-stage cylindrical roller thrust bearing. Tandem Thrust bearings are comprised of "stages" which include precision ground and matched thrust plates. These bearings also include compression sleeves separated by cylindrical roller assemblies. This design enables the Tandem Thrust bearings to provide a solution in a radial restricted envelope. The bearings are available in multiple stages, 2-8 to accommodate your design requirements. Depending on your preference, these bearings are available in a wide variety of sizes and options.

Tandem Bearings Type

1.Multi-stage cylindrical roller thrust bearing (basic type) adopts elastic spacer to connect the shaft

 washer,housing washer, roller and cage assembly.

The components of this Thrust Bearings are demountable. The user should assemble or dismount

the bearing meticulously according to numeral order we provide.

2. Multi-stage cylindrical roller thrust bearing (shaft type) is made by penetrating an axis through the

 inner bore of basic type multi-stage cylindrical roller thrust bearing and fastening the bearing to the

 axis by locking collar.

The components of this type of cylindrical roller thrust bearing are inseparable.

3. Multi-stage cylindrical roller thrust bearing (sleeve type) locking collar is made by covering a sleeve

to the external of the basic type multi-stage cylindrical roller thrust bearing.It is also

inseparable,and is assembled and disassembled as a whole.

Multi-Stage cylindrical roller thrust bearings(Tandem bearings) has the characteristics of limited radial space, high axial forces, equal support of all the rows of rollers and long operating life, and is the ideal spindle of parallel screw extruder.

The tandem bearings provided by our institute has the following types: double rows, three rows, four rows, five rows, six rows and eight rows, we also provided bearings with shaft and sleeve barrel. Customers can have their own selections according to center distance of screws, space and load (Figure 1~3). We also accept the orders of other dimensions.

Application of tandem bearings

   When using  tandem bearings, the following recommendations should be adhered to:

   1. Preload: 1% of the dynamic basic load rating. The dynamic basic load rating of each tandem bearing see Figure 1~3. Figures not listed will be provided by out institute on request.

   2. Radial guidance: full complement cylindrical roller bearings or needle roller bearings can be used.

   3. Eliminate tilting: the supporting parts must be machined to eliminate any tilting.

   4. Mounting tolerances:  recommended the following mounting tolerances: shaft f6 and housing bore F7.

   5. Lubrication: tandem bearings must always be lubricated by oil circulation (Figure 4)

1.Multi-stage cylindrical roller thrust bearing (basic type) adopts elastic spacer to connect the shaft

 washer,housing washer, roller and cage assembly.

The components of this Thrust Bearings are demountable. The user should assemble or dismount

the bearing meticulously according to numeral order we provide.

2. Multi-stage cylindrical roller thrust bearing (shaft type) is made by penetrating an axis through the

 inner bore of basic type multi-stage cylindrical roller thrust bearing and fastening the bearing to the

 axis by locking collar.

The components of this type of cylindrical roller thrust bearing are inseparable.

In 2000, our multi-stage cylindrical roller thrust bearing (shaft type) obtained the national patent and

was awarded “high-tech product” by Department of Science and Technology in Anhui Province.

3. Multi-stage cylindrical roller thrust bearing (sleeve type) locking collar is made by covering a sleeve

to the external of the basic type multi-stage cylindrical roller thrust bearing.It is also

inseparable,and is assembled and disassembled as a whole.

Shaft type:This type is another structure derived from the basic type. A shaft is put through the bore of the basic type. The bearing is fixed onto the shaft by some elastic snap ring. This type is not separable and must be mounted as a whole.