Linings for drive sheaves Customer Information Content: Traction 2 K25 2 Production 3 Quality 3 Ropes 4 Assembly 5 Test facilities 6 Brake pads 7 Wheels 7 BECORIT 8 Contact 8 Lining Lock block K 25 D 920 D 670 SB K 22 Becoplast
K25: highest COF under wet circumstances Traction safety for drive sheaves The COF (coefficient of friction) between steel rope and liner assures the efficiency of the leading sheave. With knowledge about the influencing factors the BECORIT GmbH can choose the best lining material. These parameters are: moisture temperature lubricant type of steel rope load case acceleration contamination K25: good friction in contact with lubricants acc. to DIN 21258 One of our solutions: K25 K25 is preferred used in hoists for coal and ore. It has outstanding chemical properties: It does not soak or swell, it is durable against mine water and rope. Even in this situation K25 has a COF that secures a save system operation. This can also be supported with additional constructive most oils, grease and measures at the lining. For lubricants. Furthermore K25 the BECORIT GmbH it is a has a higher friction coefficient pleasure to give advises. under wet conditions then under dry conditions (see diagram). Even under extreme conditions K25 features a save friction coefficient: In case of heavy load the system operator should expect lubricant squeezing out of the steel 2
Customised production process The production of the BECORIT GmbH enables small tolerances and high flexibility. The profiles of linings can have one or several grooves. The design of the lining can also be adapted to the application. Furthermore there are following differences for assembly: complete blocks wedge blocks screwable blocks clampable blocks Due to design and profile the liners join with the leading sheave to one unit. Fundamentally the inner and outer diameters of the traction (rope) sheave as well as rope diameter and depth of rope groove should be given by all orders. Increases in the pretensioning of lining blocks are specifications and will be given by the BECORIT GmbH. Quality assurance All production steps are subject to permanent review. This includes receiving inspections of all raw materials, as well as quality tests of semi-finished and finished products. We pay special attention to the examination of the physical properties, especially those which influence the friction coefficient. Only after approval the release for delivery is given. All steps are documented traceable. 3
Longitudinal stress Way of one strand Wire Ropes The forces of hanging loads are transmitted by ropes which thereby are stressed in longitudinal direction. The typical stress in one strand while running over a sheave is depicted in the left diagram. Aside from the shown stress spikes the total load separates unevenly across all strands: For an ordinary rope the maximum stress lies in position 8 and 14. For a lang lay rope these positions are 5 and 13. (compare to leftsided simplification). The less the strands relatively move to each other, the less even are the forces separated on all strands: A shorter rope life is the result. Likewise a shorter lifetime results from a hard groove surface because of a strain -hardening of the outer strands. Therefore while designing a sheave consider the compensating movements of the strands as well as the hardness of the groove surface. The BECORIT GmbH has been working since 80 years with this issue: Linings for sheaves can separate the arising loads more even on all strands and can prevent a strain-hardening. It is a pleasure for the BECORIT GmbH to supply you with more information. 4
Assembly instructions The lining segments are placed side by side and wedged tightly with strong hammer blows. To close the lining belt key blocks are inserted which are either single part (depicted right) or multiple parts (depicted left). When inserting a single part key block, the remaining gap between the first and last lining block is filled in with the supplied block and a small plate until the key block can be fitted in tightly. This block is secured to the pulley rim by means of a screw. When inserting a multiple parts key block, the remaining gap is first closed with the block and the plate until the block can befitted and driven in with light hammer blows. The short block is then inserted and driven in the direction of the arrow (shown in sketch). The same applies for blocks and. The endplate is then tightly wedged into the remaining gap from above. 5
Test facilities BECORIT s first priority: Safety. Quality achieves safety. Quality implies research and development, verifications and benchmarking. Therefore the BECORIT GmbH has the most modern facilities for development and verification: For example the most innovative test facility for train brake pads in Europe. Due to these systems braking under extreme weather conditions (snow, ice and low temperatures) can be simulated. This evaluation checks the skills of each brake pad under environment dependence. Linings for drive sheaves are tested in a friction test facility under different circumferences: Dry wire rope Wet wire rope Lubricated wire rope The BECORIT GmbH also carries out application-oriented tests to assess the suitability of materials for extraordinary uses. 6
Brake Pads Brakes are safety components, wherefore the functionality and reliability of the linings is the first priority for the BECORIT GmbH. In doing so highest expectations of several industries are fulfilled: Cable cars, hoists, suspension railways, windmills and trains. To increase the selection and range of pad materials the BECORIT GmbH regularly develops new linings. This regards organic as well as sintered pads. Every lining is developed according to its specific use. Friction wheels BECORIT - Friction wheels are in operation mainly in underground sectors of mining. Here high traction is demanded from the drive units of the locomotives. BECOLAN friction wheels ensure that the driving torque sits securely on the rail. The diversity of possibilities available in the designs of friction wheels means that they can be adapted to fit the type of machine in question in any application. As a result, it is possible to equip both large machines, such as diesel or battery-driven locomotives, as well as smaller shunting trolleys. By developing an appropriate design and geometry of the friction wheel lining, it is possible to achieve an optimum transmission of drive torque and thus ensure a high availability and long working life of the wheels. In many tests there was found an optimal tread what makes possible to give a high standard of safety to the transportation in underground sectors, even on wet rails. 7
BECORIT: Safe is safe Our success story began with the production of friction materials for hoisting and lifting systems in mining. That was back in 1926. Twenty years later, BECORIT GmbH was also developing brake pads for railway vehicles and became one of the most renowned manufacturers of friction materials across the whole world. It has always been our goal to develop technically innovative products which prove themselves to their users through their excellent quality. This is a general principle which will also ensure our success in the future. We focus on a clear goal: to satisfy our clients worldwide to the very highest degree. Your contact team: BECORIT GmbH Rumplerstraße 6 10 45659 Recklinghausen Germany Phone: +49 2361 666-797 Fax: +49 2361 666-808 E-Mail: info@becorit.de Safe is safe Guenter LITSCHKE (Mech.Eng.) Director Sales & Engineering E-Mail: glitschke@wabtec.com Phone: +49-2361-666-735 Fax: +49-2361-666-808 Mobile: +49-171-99-016-99 Lukas SCHINK (M.Eng.) Manager Sales & Engineering E-Mail: lschink@wabtec.com Phone:+49-2361-666-797 Fax: +49-2361-666-781 Mobile:+49-172-35-020-37 www.becorit.de The Becorit GmbH is certified: IRIS; ISO 9001 ISO 14001 8