Linings for drive sheaves

Size: px

Start display at page:

Download "Linings for drive sheaves"

Norma Poole
6 years ago
Views:

1 Linings for drive sheaves Lining Lock block Content: Traction 2 Quality 3 Wire Ropes 4 Assembly 5 Test facilities 6 Brake pads 7 Wheels 7 BECORIT 8 K 25 D 920 D 670 SB K 22 Becoplast

Traction safety Customer Information: Traction K25: highest COF under wet conditions The coefficient of friction (COF)

With extensive knowledge about the influencing factors BECORIT GmbH can choose the best lining material.

good friction in contact with lubricants acc. to DIN 21258 K25 K25 is preferably used in hoists for coal and ore.

Even under extreme conditions K25 features a high friction coefficient: In case of heavy load the system operator can

2 Traction safety Customer Information: Traction K25: highest COF under wet conditions The coefficient of friction (COF) between a steel wire rope and liner assures the efficiency of the leading sheave. With extensive knowledge about the influencing factors BECORIT GmbH can choose the best lining material. These parameters are: moisture load case temperature acceleration lubricant contamination type of steel wire rope K25: good friction in contact with lubricants acc. to DIN K25 K25 is preferably used in hoists for coal and ore. It has outstanding chemical properties: It does not soak or swell, it is durable against mine waters and most oils, grease and lubricants. Furthermore K25 has a higher friction coefficient under wet conditions then under dry conditions (see diagram). Even under extreme conditions K25 features a high friction coefficient: In case of heavy load the system operator can expect lubricant to squeeze out of the steel wire rope. Even in this situation K25 has a valuable COF that improves the safety of the system. This can also be supported with additional constructive measures at the lining. For BECORIT GmbH it is a pleasure to give advise. 2

Customer Information: Quality Reliable Traceability All

Inspections of raw materials received: e.g.

materials. 2. Quality tests of semifinished products: e.g.

thermalmechanical reaction behaviour. 3.

$shear, compression and fracture tests.$ properties, especially those which influence the friction

Only after approval the release for delivery is given.

3 Customer Information: Quality Reliable Traceability All production steps are subject to permanent reviews: IRIS 1. Inspections of raw materials received: e.g. Becorit inspects the grain size distribution of all bulk materials. 2. Quality tests of semifinished products: e.g. all manufactured granulates are inspected regarding thermalmechanical reaction behaviour. 3. Quality tests of finished products for example with tensile, shear, compression and fracture tests. 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. Inspection of the grain size distribution Intermediate inspection with the Elastographen Final inspection with the Zwick testing machine ISO 9001 ISO

running over a sheave is depicted in the

strands: For an ordinary rope the maximum

For a lang lay rope these positions are 5

each other, the less even the forces are

The BECORIT GmbH has been working since 80

4 Customer Information: Wire Ropes Longitudinal stress Way of one strand Wire Ropes The forces of hanging loads are transmitted by ropes, which are thereby 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 distributes unevenly across all strands: For an ordinary rope the maximum stress occurs in position 8 and 14. For a lang lay rope these positions are 5 and 13. (refer to leftsided simplification). The less the strands move relatively to each other, the less even the forces are distributed 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 on this issue: Linings for sheaves can distribute the arising loads more evenly on all strands and can prevent strain-hardening. It is a pleasure for the BECORIT GmbH to supply you with more information. 4

Customer Information: Assembly Assembly instructions The lining segments are placed side by side and wedged tightly

To close the lining belt key blocks are inserted, which either comprise of a single part (depicted right) or multiple

When inserting a single part key block, the remaining gap between the first and last lining block is filled in with the

This Fundamentally the geometry and the inner and outer diameter of the lining groove as well as rope diameter and

Increases in the pretensioning of lining blocks are specifications that will be given by the BECORIT GmbH.

5 Customer Information: Assembly 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 either comprise of a 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 adjustment block and thin plates until the key block can be fitted in tightly. This Fundamentally the geometry and the inner and outer diameter of the lining groove as well as rope diameter and depth of rope groove should be given with all orders. Increases in the pretensioning of lining blocks are specifications that will be given by the BECORIT GmbH. block is secured to the pulley rim by means of a screw. When inserting a multiple part key block, the remaining gap is first closed with the adjustment block and plates until the block can be fitted 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

Customer Information: Test facilities Test facilities

Quality implies research and development, verifications and

Therefore the BECORIT GmbH has the most modern facilities

innovative test facility for train brake pads in Europe.

conditions (snow, ice and low temperatures) can be

This evaluation checks the capability of each brake pad

Linings for drive sheaves are tested in a friction test

6 Customer Information: Test facilities 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 capability of each brake pad under environmental dependence. Linings for drive sheaves are tested in a friction test facility under different circumstances: 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

Customer Information: further products Brake Pads Brakes

reliability of the linings is the first priority for the

In setting this priority highest expectations of several

BECORIT GmbH regularly develops new linings.

Every lining is developed according to its specific use.

operation mainly in underground sectors of mining.

of friction wheels means that they can be adapted to fit

As a result, it is possible to equip both large

friction wheel lining, it is possible to achieve an

7 Customer Information: further products Brake Pads Brakes are safety components, therefore the functionality and reliability of the linings is the first priority for the BECORIT GmbH. In setting this priority 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 entails 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 an optimal tread was found making it possible to provide a high standard of safety for the transportation in underground sectors, even on wet rails. 7

Customer Information: Becorit BECORIT: Safe is safe Our success story began with the production of friction materials for hoisting and lifting systems in the mining sector. That was back in 1926.

8 Customer Information: Becorit BECORIT: Safe is safe Our success story began with the production of friction materials for hoisting and lifting systems in the mining sector. That was back in Twenty years later, BECORIT GmbH was also developing brake pads for railway vehicles and became one of the most renowned manufacturers of friction materials in many countries around the 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 Recklinghausen Germany Phone: Fax: info@becorit.de Safe is safe Guenter LITSCHKE (Mech.Eng.) Director Sales & Engineering glitschke@wabtec.com Phone: Fax: Mobile: Lukas SCHINK (M.Eng.) Manager Sales & Engineering lschink@wabtec.com Phone: Fax: Mobile: Becorit is certified: IRIS ISO 9001 ISO

Linings for drive sheaves

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