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f+h Intralogistics 3/2014

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f+h Intralogistics 3/2014

Drive technology a b c d

Drive technology a b c d e Stepping it up a notch in logistics Raimund Perneder, Burkhard König In fully automated high-bay warehouses, storage and retrieval systems take over the handling of charge carriers. Due to their linear motion sequences, timing belts can also be used instead of rope or chain drives for start-up processes in storage locations. Timing belt technology offers a range of configuration options to companies specialised in drive technology. These options are basically determined by the requirement profiles of a storage and retrieval system. Raimund Perneder is an author of specialist books and a freelancer for SIT Antriebselemente GmbH. Engineer Burkhard König is Product Manager of SIT Antriebselemente GmbH, based in Brakel, Germany The most common construction techniques for storage and retrieval systems are rail-guided single-column devices. In order to control storage locations, three main directions of motion are required: aisle-related horizontal motion (x direction), vertical lifting and lowering of the load hand-ling device (y direction) and the motion of a telescopic fork for storing or removing from stock (z direction). These linear driveways control, accelerate and position the timing or synchronous belts. A variety of implementation concepts are available with regard to the motion technology of a storage and retrieval system and load handling device. Project engineers generally prefer a durable and high-performance solution, which can easily process, lift and position thanks to standard drive components. Due to the linear motion to be performed in all directions, timing belts can prove to be a useful solution, and their positive tooth engagement simplifies tasks while being positioned. Precise position control A particular security interest concerns the control system. In fact, the control station must always be checked, together with the location and status (e. g. speed) of the load handling device. When controlling, it is possible to switch to the deceleration phase when at maximum speed. Therefore, servo inverters affect sinusoidal starting and braking ramps, thus eliminating build-up of the structure. In each storage location, target markings can be found on shelves or shelf braces for accurate positioning. Each storage location is approached in controlled silent running and, normally, the entire software provides multiple security measures and is redundantly designed. The control system is designed to be safe in the event of a power failure, so that neither the programme nor the goods to be conveyed can crash. In addition, faults are recorded and statistically analysed in order to obtain information aimed at creating preventive maintenance strategies. The supply of the traction current and control signals is provided, for example, by conductor lines, energy chains or noncontact systems through inductive feeding. In combination with modern process control systems, drive stations (servo technology) can be controlled so that optimal driveways with short access and cycle times can be created. It is therefore important to bring the goods to be conveyed from A to B quickly, safely and with little effort. Belt drive geometries With regard to the design of drive technology for storage and retrieval systems, the belt 26 f+h Intralogistics 3/2014

Drive technology 01 For horizontal and vertical positioning of the load handling device, different positioning options are available for timing belts layout for timing belt positioning is of particular interest. Images 01 a to e show different versions of horizontal-vertical concepts (x-y movements), each with its own individual feature. They show operators the variety of options with different geometric positions for timing belts. The solutions presented are also found in surface gantries or gantry robots. Image 01 a shows a storage and retrieval system with two timing belts that work independently. The chassis motor for horizontal motion is installed in a fixed position (in the image foreground) and, during operation, the motor of the lifting mechanism is located on the mobile beam below the column of the storage and retrieval system. In Image 01 b, both drive stations are installed in a fixed position. The motor illustrated on the left of the image controls the vertical motion of the load handling device, whereas the one on the right controls the horizontal motion of the storage and removal system. In order to achieve horizontal motion of the load handling device, both motors are to be controlled with the same speed and direction of rotation, whereas, for vertical motion, only the left one is operated. With any other combination in terms of speed and direction of rotation, corresponding diagonal motion of the load handling device can be achieved. The storage and retrieval system in Image 01 c is available with just one timing About SIT SIT Antriebselemente GmbH is a German company with headquarters in Brakel and in other sites in Europe, as well as in China and the USA. The global company is specialised in the mechanical drive technology sector and its field of activities covers all types of wrap-around drives and related accessories for industrial use. As a system provider for mechanical drive technology, the company provides pulleys, belts, couplings and shaft-hub connections from a single source. belt, which controls both horizontal and vertical directions of motion. The belt is struck with its ends on the load handling device, and its geometric positioning resembles an “H”. At the head end of the system, a top and a bottom drive station are installed. Motors driven in opposite directions provide horizontal motion at the same speed, whereas motors driven in the same direction provide vertical motion of the load handling device. Other combinations ensure diagonal motion. The configuration in Image 01 d has two separate timing belts, both with clamped ends. The timing belt for horizontal motion is stored on the floor. Both clasp their respective drive pulley, thus forming the geometrical shape of the Greek letter omega (Ω). Here, both motors are installed and are movable. More efficient. More productive. More successful. Optimise your processes in warehousing, production, and distribution. We offer powerful and flexible material handling systems for the entire supply chain. You know your requirements. We have the solutions. DAIFUKU. 02 Telescope drive for load handling devices Image sequence from top to bottom: Central position – extended to the left – extended to the right DAIFUKU CO., LTD. c/o Industrial Logistics Тел. +7 (495)-225-13-59


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