DE202008009424U1 - Slant-tolerant discs for suspension drives - Google Patents

Abstract

The obliquely tension-tolerant disc for cable drives is characterized in that at least two zones with different coefficients of friction are present.

Description

Which technical problems should be solved the invention solved become?

In Drives of machinery for the transport of goods and Passengers like shaft conveyors, lifts but also devices The intralogistics such as storage and retrieval machines and cranes are getting through the design and arrangement of the drums, the driving and deflection discs during the run of the suspension to unavoidable so-called. Schrägzügen. Under slant trains is understood that the suspension means not from the beginning of the roll at deflected in the groove bottom of the drum groove and / or the disc base is, but first runs on one of the groove flanks. in the further course of the overrun of Disc will get the rope into the groove bottom. this happens by sliding or rolling in. Most are to glide and a combination of the two described movements Roll.

By the sliding of the suspension element over the groove flank, there is a relative movement between the suspension element and groove resulting in increased abrasive wear. at the rolling movement is the support means in a rolling movement in the direction of impact the strands turned up and contrary to the direction of impact of the strands turned down. A twisting of the rope reduces the distances of the rope Strands to each other with the result of punctiform contact inside the suspension element with life-reducing high local pressures. When turning up the stranded bandage is loosened. Single element of strands though also the rope insert can take on extra lengths. When running over Slices then become those excess lengths to the ends of the rolled over Zone irreversibly deferred and form so-called baskets. When baskets occur the plant no longer operable. Costly change of suspension element and downtime are the result. Apart from that, at a failure to recognize the damage consequential damages such. B. suspension means derailment with load crashes not be excluded. This effect is enhanced when special friction pairings must be used, the high friction force transmission such as B. in Koepeantrieben allow. With increasing coefficient of friction increases the problem of diagonal pull and the possible consequences outlined above.

By the bias-tolerant Slices are made while maintaining the necessary for the task Friction coefficients z. B. for the transmission of frictional forces on the suspension means for a conveyor movement, the effect of the suspension element roll when entering the deflection pulleys reduced or as far as minimized. Lifetime-reducing effects become pushed back.

With the bias-tolerant On the one hand, the economic efficiency of the conveyor technology Plant and machine increased. In addition, a significant contribution to ensure the safety of the entire system during operation.

In what way has the problem been so far solved?

With usual So far, the designer has only had the opportunity to have discs with a variation of the groove opening angle to a limited extent to influence the suspension element rolls. This possibility is with the Schrägzugtoleranten Slice in addition where.

What disadvantages do the known draw Solutions after yourself?

at usual Slices are the friction pairing suspension element - disc flank under certain circumstances unfavorable, that a rotation of the support means and / or increased abrasive wear on the flanks even unavoidable. Due to the additional wear on both Friction partners can safety relevant changes occur that the Influence overall system. In addition, economic damage is due to unexpected service and costly downtime not be ruled out.

Which tasks are the basis of the invention?

reduction of the bias influence on the injury the daily means when running over Slices and increase the economy and safety of the entire system.

How does this task become in the invention solved?

The obliquely tensile-tolerant disc is characterized in that the groove flanks ( 1 ) obtained a smaller coefficient of friction than the groove bottom ( 2 ). The smaller coefficient of friction of the groove flank is achieved by mechanical processing (specification of a deliberately structured surface), deposits and embedding in the groove flanks, coatings or coatings, chemical or thermal treatments. A reduction of the friction coefficient is also conceivable by the incorporation of lubricants in the groove materials, which are released during operation, ie in the overrunning between the friction partners Tragmittel - and disc. A completely reduced coefficient of friction over the entire groove, ie groove flanks and groove bottom, is not desirable, since there is a risk that the suspension element is pulled over the disc without this rotates. The expected relative movements between suspension element and disc could in turn cause increased abrasive wear.

Claims (16)

The obliquely tension-tolerant disc for cable drives is characterized in that at least two zones with different coefficients of friction are present. The bias-tolerant Slice for Cable drives is characterized in that the zones of different Friction values are generated by mechanical processing. The bias-tolerant Slice for Cable drives is characterized in that the zones of different Friction values are generated by thermal treatment. The bias-tolerant Slice for Cable drives is characterized in that the zones of different Friction values are generated by chemical treatment. The slant-tolerant washer for cable drives is characterized in that in the groove flanks ( 1 ) Inserts with a friction coefficient different from the disc material are inserted, screwed in, clamped or glued. The bias-tolerant Slice for Cable drives is characterized in that the disc of at least one or more materials. The bevel tolerant pulley for rope drives is characterized in that the groove flank ( 1 ) is completely or partially coated. The bevel tolerant pulley for rope drives is characterized in that the groove flank ( 1 ) is painted completely or partially. The slant-tolerant washer for cable drives is characterized in that the groove opening angle ( 5 ) is at least 25 degrees. The slant-tolerant pulley wheel pulley is characterized in that the groove depth ( 3 ) is at least 40% of the nominal diameter of the suspension. The slant-tolerant pulley wheel pulley is characterized in that the groove edges ( 4 ) are provided with a radius r less than 20% of the Tragmittelnenndurchmesser. The obliquely tensile-tolerant disc for cable drives is characterized in that the zone on the groove flanks with different coefficients of friction on one or both sides to the groove bottom ( 2 ). The bias-tolerant Slice for Cable drives is characterized in that the groove bottom with undercuts can be provided. The bias-tolerant Slice for Cable drives is characterized in that the zone on the groove flanks with different coefficients of friction a length of at least 5% of Tragmittelnenndurchmessers Has. The bias-tolerant Slice for Cable drives is characterized in that they consist of one or more Consists of materials. The bias-tolerant Slice for Cable drives is characterized in that the zones of different Friction values are generated by combining machining processes.