Chain and belt tensioning systems
40Pages

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TENSIONING SYSTEMS - TABLE OF CONTENTS Function, Principles, Handling 4 Optical Control Displays 5 Chain and Belt Monitors 6 Mechanical Limit Switches 6 Mounting Brackets for Spann-Box® Sizes 1 and 2 8 Graphical Depiction of Installation Examples 9 The Correct Choice of Chain Tensioner 13 Chain Tensioners for Roller Chains as per DIN 8188 14 Spann-Boy®, Spann-Boy®TS, Spann-Box® Size 0, 33 - 39 Spann-Box® Size 1, Spann-Box® Size 1 Type SR-L, Spann-Box® Size 1 Type SR-S

TENSIONING SYSTEMS For chains and belts Advantages of our tensioning systems Wide range – extensive inventory Thanks to our variety of different tensioning systems, we are able to quickly and accurately meet practically any requirements. If you require an individual solution, our freeof-charge, non-binding consulting services are sure to help. Reduction in wear on chain links and drive sprockets Reduction in working noise Automatic adjustment Compensation for chain and belt elongation Use as chain and belt monitors Direction change for chain and belt drives T ENSIONING SYS T EMS – TABLE OF...

FUNCTION, PRINCIPLES, HANDLING Our tensioning systems are free-running and resilient. As a result, they do not function as rigid deflectors when stressed. This avoids excessive contact pressure. Our systems aim to keep the overall force on the slack strand – resulting from the weight of the chain and the centrifugal force – under control. The ideal installation position is right behind the drive sprocket in order to keep the length of the slack strand that needs to be tensioned as short as possible. Use at extreme temperatures If you choose the correct material, you can also use our...

OPTICAL CONTROL DISPLAYS Murtfeldt Spann-Box® systems generally have a coloured scale. This enables you to determine the tensioning state of the chain at a glance. The display is as easy to understand as possible: Green The chain tensioner is working in the “green range”. The tensioning force is providing an ideal, smooth running movement. Yellow The tensioning force is not ideal but is still sufficient. F unct ion, Principle s, Handling / Opt ical Cont rol Displays Red The chain tensioner needs to be adjusted. The tensioning force on the chain is too low for a smooth and reliable running...

CHAIN AND BELT MONITORS If a chain has excessive elongation or a break, critical damage can occur. Our chain and belt monitors track the production process and trigger the automatic shutdown of the machine if malfunctions occur. For this purpose, a mechanical limit switch or contact-free inductive switch is integrated into your chain or belt tensioner. Both individual and reliable Switch design requirements can vary greatly. Please contact us for more information. We will design the best solution for your requirements. MECHANICAL LIMIT SWITCHES To best suit your requirements The attachment...

Chain and Belt Monitors / Mechanical Limit Switche s / Induct ive Switche s T ensioning s yst ems Spann-Boy® (left) and Spann-Box® (right) with mechanical limit switch INDUCTIVE SWITCHES For Spann-Box® Alternatively, a contact-free inductive switch can be used. This makes sense if there is a risk of explosion or contamination. Concerns about wear might also result in the use of an inductive switch. Inductive switches can be used for Spann-Box® size 1 and 2. Special models and designs in stainless steel are available on request. 7

MOUNTING BRACKETS FOR SPANN-BOX® The ideal assembly aid We offer various mounting brackets to make assembly more easy. They provide additional modification/adjustment flexibility. Elongated mounting holes allow easy adjustment if the normal tension distance has already been used up. Alignment errors can be corrected by side movement. We are happy to provide detailed assembly instructions for all our systems. Simply contact us or see our Web site at www.murtfeldt.com. Corresponding size Adjustment range

Optimum, extremely efficient chain support/tensioning 180° return profile. This arrangement allows a particularly long chain length to be accommodated. Return/tensioning station Popular but non-optimal arrangement, tension distance not used efficiently Mount ing Br acke ts / Gr aphical Depict ion of Installat ion E x a mple s GRAPHICAL DEPICTION OF INSTALLATION EXAMPLES If the running direction changes, we recommend using two Spann-Box® units near to the drive. 9

SPECIAL TENSIONERS The requirements of our customers are diverse. No pool of machinery is the same as another, so the enquiries we receive are often extremely individual. We will do everything possible to meet your demands with our special models. Correct advice is absolutely vital here – it‘s what makes our components reliable. system for your machines to be determined. A host of factors can restrict functionality, such as force effects, chain speed, chain pressure, contamination, and temperature. The use of machinery in problematic temperature ranges can often result in a high risk of...

Spann-Box® size 1 with arc segment made from Material ”S”®plus+OIL for an accumulator chain Size 1 tension station with roller Spann-Box® size 1 or size 2, tandem tensioner for tensioning chains with extremely large chain pitches T tension station for compensation of extensive chain lengthening Spann-Box® size 1 with return profile made of Murdotec® SP in accordance with customer’s requirements Spann-Box® designs with locking devices; they prevent the slide profile from being compressed when the direction of rotation changes, for example.

OVERVIEW OF Spann-Box® Types Chain tensioners Spann-Box® size 0 page 21 Spann-Boy® with arc segment profile – page 17 Spann-Boy® with sprocket page 18 Spann-Boy® TS with arc segment profile – page 19 Spann-Boy® TS with sprocket page 20 Spann-Box® size 30 page 22 Spann-Box® size 1 with arc segment profile – page 24 Spann-Box® size 1 with semi-circular profile – page 25 Spann-Box® size 1 with return profile – page 26 Spann-Box® size 1 with sprocket type K-L – page 27 Spann-Box® size 1 with sprocket type K-S – page 27 Spann-Box® size 2 with arc segment profile page 29 Spann-Box® size 2 with...