Design and application advice

Linchpins at the end of shafts

This is one of the widest spread applications. In response, Rübig has supplemented the standard series, offering an even wider range of sizes than those listed in DIN 11023:

nominal size	D max.	d	c	f x 45°
4×27	20	4	8	2
6×27	20	6	8	2
5×32	25	5	8	2
6×42	32	6	10	2
8×42	32	8	12	2
10×45	32	10	14	2
12×45-	32	12	18	2
12×45+	32	12	18	2
10×55	45	10	15	2,5
12×55-	45	12	15	2,5
12×55+	45	12	15	2,5
17×60	45	17	21	2,5
6×62	53	6	15	3
8×62	53	8	15	3
10×65	53	12	15	3
12×65	53	12	15	3
8×75	63	8	18	4
10×75	63	10	18	4
12×75	63	12	18	4
17×75	63	17	21	4
10×100	80	10	21	5
12×100	80	12	21	5
17×100	80	17	21	5
10×125	105	10	25	5
12×125	105	12	25	5
17×125	105	17	25	5
20×150	125	20	35	5
20×175	150	20	35	5

Linchpins in the center of the shaft or tube

When using linchpins on tubes it’s necessary to pay special attention to the maximum surface pressure. The allowable values are ..

max. 350 N/mm² for DIN Linchpins up to 8 mm diameter;
max. 420 N/mm² for DIN Linchpins 8mm- 10mm diameter; and
max. 250 N/mm² for Commercial Linchpins

.. and should not be exceeded. We also offer hardened pins upon request which can handle pressures up to 850 N/mm².

RUBIG linchpins – reliable and durable

Linchpins are used for connecting and securing elements onto or betweenmachines. Optimal design andquality in these safety elements are therefore vital.

RÜBIG linchpins are forged in the die. This allows a wider
selection of materials as well as a special detail design. The
specially developed shape of the locking clip ensures optimal
closing force and safety in the linchpins.

Linchpins are safety elements, so continuous quality control is a priority when it comes to their production

Linchpins on rectangular tubes and special applications

The RÜBIG Formclip was especially designed for securing rectangular tubes. Simple closures, transport hedges etc. can be constructed cheaply and conveniently using formclips.

FAQ Chains

Direction of travel

A RÜBIG chain may run in both directions. However, when contaminated it is advisable that the hooked ends of chain links are arranged in travel direction (A). In case of high tensile forces (at most when 20% of the break load is reached), the chain should be arranged the other way around (B), thus enabling the chain links to be more easily disengaged from the driving sprockets. At any rate, the chain must be laid on the sprockets with the opened side of the hook facing upwards! If possible, the drive should be located on the tension side/in the desired (main) transport direction.

Chain tensioner

Spring suspended guide wheels from one side
Guide wheels with adjustable tension

In case foreign objects penetrate between the wheel and the chain, a suspended axle is always an advantage.

Weldability

RÜBIG chains have good weldability. However, when welding to flanges and bars you need to take care as the surfaces of the joints must not be heated above 250°C. The direction of welding shall be always from the thinnest to thickest part of the chain link. Before welding the chain link from the opposite side, let it cool down at ambient air temperature first! When welding items onto “HV” chain elements we recommend keeping these at 190°C – 200°C for one hour holding time in order to relieve stress. In case it is not possible to prevent overheating of chain links due to their quantity or the cross section of welded items or in case the chain links’ microstructure is without defects, they could be sent back to RÜBIG after the welding is performed to undergo repeated heat treatment.

Chain base – division bars fixing

It is convenient to use steel as a base supporting surface and special sliding rails made of “Robalon”. The chain should be welded to the attachments so that the attachments slide over the base; however, the chain itself does not come into contact with the base.

Overload clutch

In order to enable defect-free operation and because of safety reasons RÜBIG recommends the installation of a mechanical overload clutch (also a shear pin, electrical overload protection, belt drive or appropriately designed and adjusted hydraulic limiter may be convenient as alternatives).

Chains running in parallel

In case there are 2 or more chain strands connected by means of the attachments’ skirting you may receive, on request for no extra price, chains assembled in pairs with matching pitch and in matching lengths.

Service / maintenance

If there is no other possibility, RÜBIG chains may also be operated without extra servicing. However, their life expectation is thus significantly reduced compared to when they receive regular maintenance. To perform the maintenance, RÜBIG recommends the application of biologically degradable chain oil (chainsaw oil). In case of operation underneath transported goods (in case of scraper floors), especially when not in operation for longer periods of time before the season begins, the chain shall be thoroughly cleaned and oiled after it has been left to dry.

The connection of a scraper flange for a scraper floor may be performed by direct welding onto the chain. This technically superior possibility is based on the application of chain links with special attachments. In this case, each scraper flange is screwed onto one left and one right chain link with attachment. As the chain link produced in this way is heat treated only after welding, the most homogeneous microstructure possible is formed in the weld joint area.

Possible Applications

Screen cleaning equipment

As the RÜBIG chains have proven themselves to be to a large extent insusceptible when exposed to wet and contaminated material, they are ideally suited for rough operating conditions in the screen cleaning equipment of small-scale hydropower plants.

Shredder equipment

The RÜBIG chain in use is, in this case, welded together with division bars to a robust, dismountable chain conveyor. This conveyor guarantees the secure feeding of organic waste, such as hedge cuttings, leaves, bark, root balls, etc. into a shredder.

Silo rotary cutter

RÜBIG chains in HV execution used in silo rotary cutters guarantee a significantly longer lifetime compared to other chain types. The possibility of manual disassembly further improves their maintenance and enables the exchange of individual chain links to achieve the optimum arrangement of links with welded-on blades or broaching tools. For application in feed mixers and in silo rotary cutters still in use today, RÜBIG chains are built to a high resistance and high wear resistant standard.

Recycling equipment

The removal operation from underneath the impact crusher is performed by a chain scraper conveyor specially developed for applications in material recycling. Crushed material such as demolition waste, stones, soil, etc. is continuously extracted from underneath the impact crusher with the help of a RÜBIG chain T100HV.

Belt filter press

A gravitational belt filter press is used for a continuous liquid separation process, especially for cooling lubricants, cooling water and circulating emulsions. The impurities are separated by means of a filtration cloth stretched on a carrier belt. This carrier belt is connected with two laterally running T49 INOX RÜBIG chains and is thus simultaneously guided, tensioned and driven.

Manure spreader

Because RÜBIG chains are not susceptible to contamination they are ideally suited for applications in spreaders of manure, sludge, etc. The large surface areas of the chain link joints prevent rapid wear or elongation of the chain.
The chain is suitable for application as a drive chain or a conveyor chain. Its typical application is in scraper floors as installed in all agricultural manure spreaders or dung spreaders installed, for example, by Tebbe and HAWE Wester. Also suitable as a scraper floor chain in lime and cement spreaders – supplied, for example, by Streumaster – these chain links forged from heat treated steel are used in road construction. If the spreader is designed robust enough, the RÜBIG chain also enables the extraction of separation lime.

Beet harvester

This linked chain, because of its wear resistance, is also used in every beet harvesting machine or full harvester built by the Holmer company. The main reason is the requested reliability of the beet harvester – from the harvester it is expected that the durability of its wear parts last at least one full season.