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Help CenterReverse Torque Loading Conditions Contact Backstop
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Reverse Torque Loading Conditions Contact Backstop
1. Advantages of Contact Backstop
Easy Installation & Disassembly
Quick disconnect mounting pins for fast torque arm installation and removal.
Reliable Lubrication
&Unique sealing design:
Using dual lipped seals and dust ring to seal. Dual lipped seals can effectively avoid internal oil leakage.
Dust ring can prevent outside dust from contacting oil seal to provide prolonged life in hostile
environments.
&Thorough system design:
Inner cam can rotate freely with shaft. Contact-sealed splash circulation can lubricate and protect
workpiece and minimize wear and tear.
Multiple oil drain plug can ensure the installation of backstop be mounted at any desired angle.
Filtered breather, oil sight gauge and purgeable grease-cavities provide a complete self lubricating system,
which shortens maintenance time.
longer Service Life
Unique design of cylindrical rollers and wedge action weaken the backstopping contact stress,
which increases life.
2. Application of Contact Backstop
Positive protection against reverse torque runaways of inclined conveyor or elevator installations, and adequate provision for the safety of operating personnel can be assured by considering the following: The causes of reverse torque loading conditions.
The importance of installing backstops on low speed headshafts -- where reverse torque loads originate.
3. Types of of Contact Backstop
DSN contact backstops are spring and sprag backstops engineered for use in low speed operation.
4. Details of of Contact Backstop
How it works
Several irregular blocks are arranged regularly between outer ring and inner ring. When the inner ring is rotating in the
working direction, the irregular blocks contact with the outer ring and inner ring gently.
When the inner ring is rotating on the contrary to the working direction, irregular blocks will be deflect driven
by spring force and wedge outer ring and inner ring closer together to afford backstop torque.
Installation Size (corresponding letter in table pls check the following pictures)
Torque Arm Stirrup Design
Stirrup is used to locate torque arm. It must have enough resistance to shear strength (pressure).
When user selected arm length is different, the withstood Toque Arm Reaction Force also changes.
The pin hole on the stirrup must be long and be installed at the same direction of torque arm, to
relieve backstop outer race from undue parallel forces.
When backstopping, the pin on the stirrup has no force effected. Its function at this time is to prevent reverse rotation
at normal runtime.
Torque Arm Stirrup Stress Diagram
Following is the minimum Torque Arm Reaction Force borne by the stirrup when torque arm length is
standard.
Common Arrangement of Backstop and Stirrup
Stirrup is used to locate torque arm. It must have enough resistance to shear strength (pressure).
When user selected arm length is different, the withstood Toque Arm Reaction Force also changes.
The pin hole on the stirrup must be long and be installed at the same direction of torque arm, to relieve
backstop outer race from undue parallel forces.
When backstopping, the pin on the stirrup has no force effected. Its function at this time is to
prevent reverse rotation at normal runtime.
Clearance: the clearance between backstop torque arm bottom and stirrup surface is
recommended to be 8 -12 mm.
5. Brief Advantages of our factory
*16 years experience in mining machinery manufacturing
*Well equipped with complete facilities, more than 50 rich experienced engineers and more than
2000 skilled employees
* Highly advanced digital processing equipment.
* All mining machinery we made are also performing in our self owned coal mine.
6. Our Factory
7. Quality Control
8. Product Process
9. Product Show
10. Working Site
The Backstop DSN130 is working in our corporate-owned coal in
Fugu, Shaanxi Province-Feimaliang Coal Mine.
Backstop DSN330 in our client's coal mine: Manshi Yongzhi Coal Mine (Ordos, Inner Mongolia)
11. FAQ
(Data required for selection of Roller Backstops)
12. We also supply
* Belt Conveyor
* Scraper Conveyor
* Grid Couplings
* Taper Lock Hub
* Coal Washing Equipment
Thank you for your reading.
And if you are interested in our products, please send us inquiries. We will reply you in time.
Send Inquiry to This Supplier
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