DS-APR23-PG52_Layout 1 20/04/2023 13:41 Page 2
PRODUCTS
CLUTCHES, BRAKES & COUPLINGS
A RELIABLE SOLUTION FOR COPPER MINE HOIST BRAKING SYSTEMS
COUPLINGS MEET THE DEMANDS OF THE STEELMAKING INDUSTRY
Quick Flex elastomeric couplings from Lovejoy, manufactured by R+L Hydraulics, are being used by a European steelmaker to drastically reduce downtime. In steelmaking, molten pig iron produced in the blast furnace is transformed into crude steel in converters. The crude steel is then cast into long strips called slabs in continuous casting lines. The slabs, up to 10m long and weighing as much as 25 tons, are rolled and shaped to form strip steel or steel wire rolls. Glowing from heat, these slabs are transported on roller tables, and here they must move continuously on the rollers until they cool down or are ready to enter the next processing step. Equipment reliability is essential here. Gear couplings tended to be used, but these had
When a major mine hoist OEM needed reliable low-speed and high-speed braking systems for a double-drum, 20-ton system designed for a copper mine hoist, it got in touch with Svendborg Brakes. On a hoist, two braking systems are usually present. High-speed service brakes
are installed on the high-speed side of the hoist’s drive motor, which hold the hoist in place when the motor isn’t generating torque, offering parking functionality. A low- speed braking system delivers stopping power in all conditions, including power loss. Achieving a gradual stop is very important, so integrated controls are required to ensure a ’soft stop’ during braking. So, in terms of the low-speed braking system, Svendborg Brakes supplied
pedestal-mounted Model BSFH 512 spring-applied, hydraulically released, dual- spring calliper brakes, each with 96,000N braking force. The brakes act on two 12ft diameter discs installed on the 10.5ft diameter rope drum. For the high-speed side of the motor, pedestal-mounted Model BSFI 3100 spring- applied, hydraulically released, mono-spring calliper brakes were chosen. Offering 80,000N braking force, the brakes are applied on a 47.5in disc. To deliver the soft stop needed for the application, Svendborg Brakes provided
customised SOBO iQ hydraulic power units. These and the braking systems are operated by a single SOBO iQ control. This braking controller uses a state-of-the-art dual-loop proportional integral (PI) control system to measure hydraulic pressure and speed, and pressure control is applied with reference to speed and hoist deceleration. Braking torque is controlled by comparing actual hoist speed feedback against a pre- determined speed ramp. Consequently, braking is smoothened throughout operation. With its braking system design and manufacturing expertise, Svendborg Brakes is
a one-stop-shop for complete solutions for individual hoist designs. Brakes, HPUs and controls can all be tailored to exactly meet hoist performance requirements, delivering an optimal solution for customers.
Svendborg Brakes
www.svendborg-brakes.com BRAKING SOLUTIONS FOR INDUSTRIAL ROBOTS
Industrial robots are increasingly being used to assemble, transport and ensure greater production efficiencies. Regardless of their industry of application, the following applies: wherever masses need to be
braked and held securely in one position, brakes are required that can reliably perform these tasks. “Fast movements with large masses such as
a car body are commonplace in robotics. This generates a high mass inertia and thus a high torque. The brake now has the task of holding the robot arm in position and braking the movement safely in an emergency. For this case, there is a safety brake that is actuated in a de-energised state,” explained Kevin Zysk, sales engineer, Brakes and Clutches at KEB Automation. With the COMBISTOP spring-applied brake and the COMBIPERM permanent magnet brake, KEB offers customers the right brake solution
52 DESIGN SOLUTIONS APRIL 2023
for different robotic applications. The COMBISTOP brake, for example, has a
torque of up to 1,500Nm and is constantly open after reaching the wear limit. In addition, the spring-applied brake can be equipped with further accessories such as a microswitch for monitoring the wear and condition of the brake, or a release lever for manually releasing the brake. The compact COMBIPERM permanent magnet
brake has a maximum torque of 145Nm and offers zero backlash, a higher power density, and fast switching times.
KEB Automation
www.keb.co.uk
disadvantages in this application. Quick Flex elastomeric couplings overcame the issues. These have torque transmission capabilities equal to those of gear couplings, but the elastomer inserts used in Quick Flex couplings eliminates metal-on-metal contact that can cause damage and wear to the hubs. The coupling’s design allows easy access to the elastomer insert. After loosening a few screws on the easy-to-remove covers, inserts can be inspected or replaced in a matter of moments. Of additional benefit, different cover options are available. “It’s easy to inspect and maintain the couplings without
taking the line out of service for long periods,” commented Detlef Peick. “Should a failure occur despite the ease of inspection and servicing, it may still be possible to continue production without jeopardising the roller, because a ruptured elastomer insert interrupts the flow of forces, so the roller table can continue to operate by using the adjacent rolls to move the slabs. The insert can be replaced later in just a few minutes, without removing the gearbox or drives.” Of further benefit, these couplings do not require lubrication
or regular oil checks and are designed specifically to withstand harsh operating conditions with minimal service. In addition to
steelmaking, the couplings are suitable for use in mining, oil and gas, food processing, and pulp and paper applications.
R+L Hydraulics
www.rl-hydraulics.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56
