Tongling Tieke Railway Equipment Co.,Ltd |
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Brief introduction:
Slack adjuster is also known as automatic brake shoe clearance
regulator. It is an important part of the truck braking rigging
device. When the brake shoes are worn and the clearance between
brake shoe and wheel thread increases, the slack adjuster will
automatically shorten and adjust the clearance between brake shoe
and wheel thread to the normal range; When the new brake shoe is
replaced, the clearance becomes smaller, and the slack adjuster
automatically extends to adjust the clearance to the normal range,
so as to keep the piston stroke of the brake cylinder within the
specified range.
At present, the commonly used slack adjuster for freight cars in
China are ST1-600 and ST2-250 two-way slack adjusters, both of
which are controlled by levers. The main difference is the
extension length of screw: ST1-600 type’s extension length is 600
mm, while ST2-250’s is 250 mm. ST1-600 type slack adjuster is
generally installed at the position of the upper pull rod of the
original vehicle, and ST2-250 slack adjuster is generally installed
at the position of the middle pull rod in the original vehicle. ST
brake slack adjuster has two-way adjustment function, and adopts
non self-locking threaded mechanical structure. It has features of
reliable function, compact mechanism, rapid action and no
interference to air braking.
Technical parameters:
S/N | Item | ST1-600 Slack Adjuster | ST2-250 Slack Adjuster |
1 | Adjust stroke (screw working length) (mm) | 600 | 250 |
2 | Max. screw extension one time (mm) | 30 | 30 |
3 | Max. screw compression one time (mm) | 135 | >50 |
4 | Max. allowed pull force (KN) | 78.4 | 78.4 |
5 | Max. total length (mm) | 2566 | 1420 |
6 | Min. total length (mm) | 1966 | 1170 |
7 | Outer diameter (mm) | 100 | 100 |
8 | Install position | Upper pull rod or balance lever | Middle pull rod |
9 | Weight (kg) | 33 | 28 |
10 | Manual adjust function | Yes | Yes |
Detail photos:
ST1-600 Slack adjuster and ST2-250 slack adjuster
Inside struture of ST type slack adjuster:
Application on railway frieght cars:
FAQ:
1. What is the L value of the screw length of the brake regulator
after loading?
When all vehicles are equipped with new high wear synthetic brake
shoes, the extension length of brake regulator rod is: st1-600
500-570mm; ST2-250 type: 200-240mm
2. What are the advantages of installing brake regulators on
vehicles?