• wedge back stop device
  • wedge back stop device

  • Model :

Wedge Backstop is a device mounted contactable in the low speed shaft of reduce or pulley shaft to prevent it from return movement, in comparing with traditional such as roller type backstop, it has the advantages of large braking moment, reliable force transfer, easy release and installation. It is formed by numbers of wedge block regularly between the outer and inner rings into a rolling path, when the inner ring moves reversely, under the spring force, the wedge block put the inner and outer ring into an integrated tight body to receive the return moment. It is commonly used in the equipment requiring non return movement such as belt conveyor and bucket elevator and so on

Working Environment 

This backstop is working under ambient temperature of -25 to 50, in operation, the backstop produces certain heat, therefore good ventilation is appreciated, when the limited highest working temperature of 80° is reached , necessary cooling measure has to be taken to protect the machine from any adverse affect. Whenever the ambient is over 38° or working in open yard, effective cooling measure has to be considered such as ventilation and other cooling devices. It is noted that no corrosive substance is allowed at the location of the device nearby.

Caution:

In case allowed by the local laws or rules, this backstop can be taken as standby brake, but it cannot be taken as operation brake or replacement.

Symbol of backstop

Symbol example:

1.when inner ring rotates clockwise, rated torque is 1000N.m, mounting bore diameter is 100mm, it is typed NFS125-100

2.when inner ring rotates anticlockwise, rated torque is 1000N.m,  mounting bore diameter is 40mm, the fixture enc cap is of disc shaped single direction double direction running, it is typed: NFBTbn10-40

Dimension and Main Parameter

Working Environment 

This backstop is working under ambient temperature of -25 to 50, in operation, the backstop produces certain heat, therefore good ventilation is appreciated, when the limited highest working temperature of 80° is reached , necessary cooling measure has to be taken to protect the machine from any adverse affect. Whenever the ambient is over 38° or working in open yard, effective cooling measure has to be considered such as ventilation and other cooling devices. It is noted that no corrosive substance is allowed at the location of the device nearby.

Caution:

In case allowed by the local laws or rules, this backstop can be taken as standby brake, but it cannot be taken as operation brake or replacement Symbol of backstop

Symbol example:

1.when inner ring rotates clockwise, rated torque is 1000N.m, mounting bore diameter is 100mm, it is typed NFS125-100

2.when inner ring rotates anticlockwise, rated torque is 1000N.m,  mounting bore diameter is 40mm, the fixture enc cap is of disc shaped single direction double direction running, it is typed: NFBTbn10-40

Dimension and Main Parameter


1 .F7 or E8/m6 of GB/T1800.4.1999 (See table 3) is recommended for the matching of backstop bore and installation shaft when placing the order( Either of the above shall be noted in placing the order)

2 .Flat key is mostly applied for the connection between the backstop bore and the installation shaft, GB/T1095-2003 shall be followed for the dimension of the key and keyway; the tolerance of backstop bore keyway is made as per D10 in GB/t-1095-2003 (See table 3)

3 .The elongation length of the installation shaft shall be equal to that of the inner ring, the minimum length shall not be less than 5/6 of the inner ring to insure sufficient strength of the shaft and key.


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