【正文】 ctivity. The two biggest factors are work surface height and reach distance.Work surface height is the height at which hands are normally held to perform work on conveyed objects. Heavier tasks performed on larger objects require a lower work surface height than light, higherprecision tasks. Since people are different heights, one fixed height can serve for everyone and you can alter the height of the conveyor itself. The thing to do is design the height appropriate to the load. If you want to vary it, design it for the taller workers and utilize step platforms for shorter workers. For standing workers doing belt picking or light assembly, the rule of thumb is about 42 inches. For seated workers, it 30 inches.Reach distance: Zones of repetitive reaching on a conveyor should be within 18 inches of the front of the operator body. This increases productivity and helps avoid repetitive musculoskeletal injuries by limiting repeated forwards reaching. This is affected by load. If numerous items are being picked from the belt, the zone of repetitive reaching enpasses the entire belt. If you are consistently moving larger items that take up most of the belt, the zone might not extend to the far edge of the belt since objects might be grasped at middepth, within the zone. If you using a wider belt with pickers on each side, the ergonomic sweet spot is still 18 inches to the center of the belt.(9) Choose the right beltingA powered conveyor belt is the only ponent in contact with both the drive pulley and the product. Despite this, it a frequently overlooked ponent. It can greatly enhance conveyor performance if properly selected and installed, or cause headaches if it is not. There are thousands of conveyor belt styles, materials, thicknesses, surfaces, and colors to consider. Because belt is costly and sometimes difficult to install correctly, getting it right the first time is important. Things to consider include the kind of load, the need for increased oil resistance, and applications where the load amp。 boxes ?Is the bottom soggy? What about protruding staples? Is the bottom of the box fanfolded or taped? Does it bulge? All of these things could cause the box to act erratically on roller conveyors.(4) Utilize energysaving controls and devicesConveyors are very energy efficient pared to the alternatives for moving product through a facility. Substantial energy and cost savings are possible. How can you convey more for less energy? Some mon sense ways to increase conveyor productivity Above: know and understand your load factors to avoid a variety of issues. Misunderstanding load factors is perhaps the most mon conveyor specification and maintenance error. We can assist you in tracking down the necessary information as you specify conveyor loads.Select the right motor for the job. The motor should run at or near top capacity at all times. If load weights vary, use twospeed motors and adjustablespeed drives to enable motors to run near top capacity.Keep the conveyor lubricated. Proper lubrication is a necessity in any energy efficient system using reducers, chains, and bearings. Besides saving energy, you抣l increase the life of your equipment.Turn your conveyor off when it is not in use. In some operations it may not make sense to continually switch them on and off, but you can efficiently do this in many cases. Intelligent controls can help by turning the conveyor off automatically when it is not needed.Use gravity feeds when possible. You can substitute gravity for power conveyor in the right situation, creating both equipment cost reductions and energy savings. Mixing power and gravity units to conserve energy and reduce costs is usually possible.Design with energy savings in mind. Use long, straight runs with fewer drives. If possible, power the entire system with one drive. Use highefficiency speed reducers. Replace wornout conveyor. Modern conveyors designed more efficiently, with appropriate controls, deliver significant returnon investment based on energy savings alone.(5) Correctly select and integrate vertical and horizontal conveyorsWhen elevation changes are necessary, choosing the right vertical transport device can make or break system performance. You have to take into account system throughput requirements, product characteristics, elevation change, number of charge/discharge points, manual or automated charge/discharge, interface with horizontal transport devices, proximity to workers, safety devices, environment, and future system requirements. Analysis of the above criteria will result in an optimum solution. In the unit handling world of a typical distribution center, examples might include vertical reciprocating conveyors (VRC), continuous vertical conveyors, incline belt conveyors, spiral conveyors, chutes, and scissor lifts.(6) Test for performance You have installed a new conveyor system, and you are ready to get into production. Not so fast. It may be tempting to turn your system loose, but you be money ahead if you allow time for adequate testing. If you do a cursory checkout, you miss the opportunity to finetune controls and detect hidden mechanical issues. Conveyor systems can have millions of moving parts designed to work in concert. Due to that plexity, a new system may need adjustments to perform. An outline of testing procedures: Inspection: Visually inspect the entire system. This is about safety. Are all the guards in place? Are the pullstops accessible? Are the safety stickers easy to see and read? The mechanical and junction boxes should be closed. Function testing: Place a small number of items on the conveyor from the various infeed points. This small amount allows for a controlled evaluation process. Look for obvious flaws。外文翻譯ENNLISH TRANSLATIONConveyor beltPoint of contact between a power transmission belt and its pulley. A conveyor belt uses a wide belt and pulleys and is supported by rollers or a flat pa