BC Model Backstops by Marland Clutch
Image source https://www.marland.com
Marland BC model clutches are extremely reliable roller style; bearing supported backstops provide positive protection against potentially dangerous and damaging reverse torque runaways of inclined conveyors. They provide positive rollback protection to equipment like inclined belt conveyors and bucket elevators, where reverse rotation must be prevented. These backstop clutches are self-contained and oil-lubricated, designed to operate in dusty, high-temperature mine and stone pit environments. Torque ranges from 3,000 to 720,000 lb.ft. Speed ranges from 0 to 300 RPM.
The Need For Adequate Backstops
Positive protection against reverse torque runaways of inclined conveyors or elevated installations, and adequate provision for the safety of operational personnel, can be assured by considering the following:
1. The causes of reverse torque loading conditions.
2. The importance of installing backstops on low-speed head shafts.
3. Use sound methods for selecting backstop sizes based on many years of successful installations rather than theoretical reverse torque calculations.
4. The basic design, operating principle, and uniformly high torque capacity of Marland One-Way backstops.
5. The simple maintenance and lubrication requirement of the Marland design.
Product Features
- 20-year, 24/7/365 service life
- Superior roller design
- Optional Smart Marland Monitoring System
- Full contact Taconite seals
- Lower stresses
- Positive triple-sealing
- 19 standard models available with torque ranges up to 2,100,000 lb.ft.
- Removable torque arm
- Optional Smart Marland Monitoring System
- Superior roller design
Design Features
Marland backstops are entirely mechanical, automatic operating units, incorporating a time-proven basic operating principle to provide greater safety and longer life with minimum maintenance requirements. Seventeen standard sizes are available up to 1,200,000 pound-feet of torque. The following design features assure superior performance:
SIMPLE INITIAL INSTALLATION
The backstop is a symmetrical product that can be mounted for desired free shaft rotation. Arrows on cam faces or inner labyrinth show the direction of free rotation.
The torque arm is a single “I” beam section attached to the backstop with two precision ground torque arm pins. This dramatically simplifies field installation. The arm may be placed up-down or at any angle and provides uniform loading on both cover plates. The position is preferred to be horizontal to reduce bearing loading for longer bearing life.
SEALED OIL CHAMBER
The Clutch elements and ball bearings are self-oiled in a sealed oil chamber. The recommended lubricant is Mobil DTE Heavy Medium oil for various ambient temperatures. A double-lip oil seal is provided adjacent to the ball bearings to keep oil in and contaminants out.
POSITIVE TRIPLE SEALING
- All metal labyrinth, grease packed.
- Full circle square packing against ground inner labyrinth that maintains grease seal and serves as an additional barrier to dirt entry.
- Double-lip oil seal to prevent grease from entering the oil chamber and oil dilution of sealing grease.
MINIMUM MAINTENANCE
Grease fittings in each outer labyrinth are provided for occasional renewal of grease seal, which forces out dirt and old grease through relief fittings. A periodic check of oil level and purity can be made through an oil level indicator while in operation or at rest. If the inspection reveals impurities in the oil, draining, flushing, and refilling can be easily accomplished through the furnished piping, tees, and drain plugs.
Marland Clutch Backstop Catalog
Marland Clutch BC Backstop Automatic Grease Lubrication System
Contact Us if you have any questions, need more information or if you are interested in purchasing a BC Model Backstop.
HVH Industrial is an authorized distributor of Marland Clutch; we work closely with the Marland engineering team to provide superior customer service and support.
Vladimir Harutyunyan
Vladimir Harutyunyan is the founder of HVH Industrial. He has masters degree in mechanical engineering and over 10 years of experience in mechanical power transmission field.
Feel free to connect with Vlad on Linkedin: https://www.linkedin.com/in/vladharut
Vladimir Harutyunyan
Vladimir Harutyunyan is the founder of HVH Industrial ...
Feel free to connect with Vlad on Linkedin: https://www.linkedin.com/in/vladharut
