Step 3 determine the diameters of the pulleys using the belt speed and rpm. The dimensions on timing belt pulleys are not inherently intuitive. This value can be used for calculation but it will be the worst case. A synchronous toothed belt may make louder noise during highspeed rotation.
With this software, the user can design simple 2pulley drives or calculate the correct timing belt for complicated multipulley drives. Pulley shaft centertocenter distance inches angle of pulley groove degrees, 90 for flat and 20 for vee coefficient of friction 0. The gravitational load to lift or lower the material being transported. Above belt conveyor designed according to indian standards is11592. Calculation methods conveyor belts siegling total belting solutions conveyor and processing belts this brochure contains advanced equations, figures and recommendations, based on our longstanding experience. This manual covers three vbelt cross sections and pulley groove sizes designated 3v, 5v and 8v. Elastic elongation due to the takeup engagement ecw is a function of the belt carcass elastic modulus and the sum of the weights of the counterweight and takeup pulley. Average hours per day of service also should be considered. Eladrive offers a drive calculation for all application technology fields. Actual operating loads known in those cases where the actual operating load is known, design the belt. Knowing the correct shaft speed of both shafts on a beltdriven machine is important when performing machinery diagnostics. Pulley design software pulley design calculator borst. In general, the drives are in the integralhorsepower class as distiguished from light duty of fractional horsepower drives. These calculations are mainly for existing installations but you could also put it towards your design if you want to calculate what the length needs to be of the belt, as long as you already know the distance between the two pulleys and the size of the pulleys.
In the following ratio, rs is the speed ratio, d1 the diameter of the driver pulley, d2 the diameter of the driven pulley. The frictional resistance of the conveyor components, drive, and all accessories while operating at design capacity. How to design takeup travel for a fabric conveyor belt. Belts may be used as a source of motion, to transmit power efficiently, or to track relative movement.
Center distance and belt length the minimum pulley diameters recommended for standard vbelts are shown in table 3. To calculate multiple pulley sets, where the first driven large pulley shaft drives the second driver small pulley, and so on, enter first small driver pulley rpm and pulley set diameters and centers separated by commas and as shown below. With unmatched conveyor pulley engineering and manufacturing capabilities, dodge has the knowledge and. Research paper design and selecting the proper conveyorbelt. Calculate corrected load or design power, using the following equations. During the project design stage for the transport of raw materials or finished products, the choice of the. How to calculate first, second and third pulley systems. The pulley equivalent of a lever and fulcrum is in fact atwoods machine, which is comprised of a pulley mounted to a fixed. Locate the power source and the driven unit in the service factors table on page 11. Shigleys mechanical engineering design type pulley 1.
In the calculation and design of a belt drive there are. Transmission designer is the optimum tool for designing two 2 timing belt pulley drives and calculating required timing belt tensions. The second part, the distance between the pulleys, is if you already know what. In this video we learn how to calculate the belt length as well as the distance between the two pulleys this is common in the hvac and building services industry, used. Step 1 determine design horsepower procedure to calculate the design hp, first determine the relative severity or service factor of the drive. Narrow belt sheaves are more compact than classical belt sheaves. One or more vbelts may be used on a drive, as required, to transmit the horsepower load. Conveyor pulley selection guide pulley core diameter the outside diameter of the cylindrical body of a conveyor pulley, without coating. Belt conveyors for bulk materials fifth edition chapter 6.
Design manual for power transmission belts alexandris. Mechanics and machine design, equations and calculators. Its easier to visualize the necessary dimensions if you imagine a smaller belt that is just big. Changing a pulley size or making an adjustment on the motor pulley if it is adjustable will accomplish this. Once you know the accurate speed of both components, use this formula to determine the. The rpm of the first driven large pulley is transferred to second set small driver pulley and so on. To calculate multiple pulley sets, where the first driven. Drive alive is the best tool for designing timing belt pulley drives with more than two 2 timing belt pulleys and. Therefore the vr of the system can be equated as distance covered by effortdistance covered by weight 2 4 1xx 2 4 1, for the present example which consists of 4 pulleys. In bulk handling applications, an adequate pulley face length is one that is 2 or 3 greater overall or 1 to 1. Pulleys transmit power from one location to another, and they can form a transmission ratio. Vbelt pulleys and lengths are now defined by means.
Face width the length of a pulleys cylindrical body. To accommodate these belts the pulleys have v shaped grooves which. This area is intended to act as the contact surface for the conveyor belt. These principles are used extensively in this chapter, although not always called out by name. Groove design the groove depth should be at least 1. Ideally you would do this by first identifying the input and output speeds using a strobe light, photo tach or laser tach. Normally the belt is wrapped around two pulleys with 180 of the belt touching each of the two pulleys. Speed ration, arc of contact, tension ration for belt about to slip, power capacity, pulley torque, initial tension. A belt is a loop of flexible material used to mechanically link two or more rotating shafts. These charts allow the user to check for interferences before a system is designed for a given ratio. The htd design requires substantial belt tooth to pulley groove clearance backlash to perform. Step 2 finding the speeds of driving and driven pulleys n 1 and n 2 in many problems, the speeds of the driving and the driven pulleys will be given. Contents page product features 4 design of vbelt drives designations and explanations applied 5 calculation procedure 6. The motor pulley is less costly, it is the easy one to change, and as.
The person lifting the 200kg load experiences a pull equal to only 50kg 200kg4. For more precise calculation, contact belt manufacturer for the tension vs elongation equation. The radius at the bottom of the groove should be slightly larger than the rope. For the ultimate in performance and economy, dodge offers engineered conveyor pulleys. Input pulley speed rpm desired output pulley speed rpm input pulley pitch diameter inches pulley shaft centertocenter distance inches angle of pulley groove degrees, 90 for flat and 20 for vee coefficient of friction 0. Avoiding overloading of the pulley mount, pulley, cable, and cargo in order to prevent failure. Dodge engineers utilize fea models and stateoftheart technologies to design conveyor pulleys assemblies of the highest quality.
If we need to calculate the distance between the centres of the two pulleys, then we can use the following calculations to approximate this. Shell strength of conveyor belt pulleys 345 there is a maximum radial displacement wmax at the shell centre of the axial section and there are two minimum radial displacements lvmin at the ends of the shell of the axial section. Pulley to calculate the effort required to lift the load we divide the load by the number of ropes do not count the rope that goes to the effort. Htd drive clearance, using small diameter pulleys, is approximately four times greater than an equivalent gt3 timing belt drive. Aug 16, 2012 belt drive speed calculation pulley size and speed calculation belt drive speed calculation duration. Using the four pulley system on the right, the person. If a belt or cable runs around a fixed shaft, friction between the belt and the shaft can cause the efficiency to be low, and the cable can rapidly wear.
We will need to know the diameters of the pulleys as well as the belt length. Pulleys are one of the oldest and most ubiquitous power transmission elements, but they require careful design. Drive alive is the best tool for designing timing belt pulley drives with more than two 2 timing belt pulleys and calculating required timing belt tensions. Visually calculate pulley size, rpm, belt length and speed wwith animated scaled diagrams. Two pulley connecting belt design and calculations. Make sure to design the pulley system within acceptable fleet angles in order to reduce crushing, abrasion, and cable stacking. For example, if your small pulley is 80mm diameter, and spins at rpm, and you need to find the second pulley size to spin it at 400 rpm, enter pulley1 80, pulley 1 rpm, pulley 2 rpm 400, and hit calculate to find the second pulley diameter. Some belts are more appropriate for specific applications. Pulley diameters, point 4, tables 2, 2a, 3 and 3a 19 installation and takeup allowance, point 7, tables 4 and 5 21 belt length correction factor, point 11, table 6 23. Poly chain gt carbon lowspeed design load calculations for use when designing poly chain gt carbon belt drives for gear reducer output shafts and general roller chain conversions. Timing belt pulley design calculator see our other engineering calculators. Two pulley drives are calculated and multiple drive design solutions are generated.
Avoiding overloading of the pulley mount, pulley, cable, and. This paper provides to design the conveyor system used for which includes belt speed, belt width, motor selection, belt specification, shaft diameter, pulley, gear box selection, with the help of standard model calculation. A simple pulley basically consists of two components, the wheel and the string. Mechanics and sliding friction in belt drives with pulley grooves article pdf available in journal of mechanical design 1282 march 2006 with 7,295 reads how we measure reads. Face width the length of a pulley s cylindrical body.
Timing belt pulley diameter charts pfeifer industries. As smaller diameter pulleys are used, the clearance required to operate properly is increased. May 26, 2019 these calculations are mainly for existing installations but you could also put it towards your design if you want to calculate what the length needs to be of the belt, as long as you already know the distance between the two pulleys and the size of the pulleys. The useful life is affected by the changing frequency of stress, the magnitude of the stress amplitude and the location. The most economical and practical pulley to replace is the motor pulley. The string is allowed to slide or pass through this groove with a load that is to be lifted fixed at one of its ends and an effort applied at the other end in order to lift the load. Fundamental principles of design discussed in topic 3 are of particular impo rtance to the proper use of bearings in machines. The goal is to increase the cfm from 3000 cfm to 4000 cfm. Determine the face length of the conveyor pulley the face length of a conveyor pulley is a derivative of the conveyor belt width. Pdf mechanics and sliding friction in belt drives with. Center distance and belt length the relation between center distance and length is given by the following formula. It consists of tension calculations on pulley, stress analysis on pulley, on components of belt conveyor and its effect. Seek to identify and apply fundamental principles as you read about bearings.