Belt Rope And Chain Drives Pdf
File Name: belt rope and chain drives .zip
A belt is a loop of flexible material used to link two or more rotating shafts mechanically, most often parallel. Belts may be used as a source of motion, to transmit power efficiently or to track relative movement.
- BELT, ROPE & CHAIN DRIVES FOR MINING ENGINEERING
- Belt rope and chain drives
- Belt, Rope and Chain Drive
- v-belt ppt
Power transmission system with taut belt connecting two See Also. Belt Pulley Chain Drive.
BELT, ROPE & CHAIN DRIVES FOR MINING ENGINEERING
Types of Belts. Material used for Belts. Types of Flat Belt Drives. Velocity Ratio of Belt Drive. Length of an Open Belt Drive. Power Transmitted by a Belt. Centrifugal Tension. Maximum Tension in the Belt. Initial Tension in the Belt. V-belt Drive. Ratio of Driving Tensions for V-belt. Rope Drive. Fibre Ropes. Sheave for Fibre Ropes. Wire Ropes. Ratio of Driving Tensions for Rope Drive. Chain Drives. Terms Used in Chain Drive.
Kinematic of Chain Drive. Classification of Chains. Hoisting and Hauling Chains. Conveyor Chains. Power Transmitting Chains. Length of Chains. Introduction The belts or ropes are used to transmit power from one shaft to another by means of pulleys which rotate at the same speed or at different speeds. The amount of power transmitted depends upon the following factors : 1.
The velocity of the belt. The tension under which the belt is placed on the pulleys. The arc of contact between the belt and the smaller pulley. The conditions under which the belt is used.
It may be noted that a The shafts should be properly in line to insure uniform tension across the belt section.
Selection of a Belt Drive Following are the various important factors upon which the selection of a belt drive depends: 1. Speed of the driving and driven shafts, 2. Speed reduction ratio, 3. Power to be transmitted, 4. Centre distance between the shafts, 5. Positive drive requirements, 6. Space available, and 8. Service conditions. Shafts layout, Types of Belt Drives The belt drives are usually classified into the following three groups : 1.
Light drives. Medium drives. Heavy drives. Types of Belts a Flat belt. Types of belts. Though there are many types of belts used these days, yet the following are important from the subject point of view : 1. Flat belt. The flat belt, as shown in Fig. The V-belt, as shown in Fig. Circular belt or rope. The circular belt or rope, as shown in Fig. Chapter 11 : Belt, Rope and Chain Drives l If a huge amount of power is to be transmitted, then a single belt may not be sufficient. In such a case, wide pulleys for V-belts or circular belts with a number of grooves are used.
Then a belt in each groove is provided to transmit the required amount of power from one pulley to another. Material used for Belts The material used for belts and ropes must be strong, flexible, and durable. It must have a high coefficient of friction. The belts, according to the material used, are classified as follows : 1. Leather belts. The most important material for the belt is leather.
The best leather belts are made from 1. The hair side of the leather is smoother and harder than the flesh side, but the flesh side is stronger. The fibres on the hair side are perpendicular to the surface, while those on the flesh side are interwoven and parallel to the surface. Therefore for these reasons, the hair side of a belt should be in contact with the pulley surface, as shown in Fig.
This gives a more intimate contact between the belt and the pulley and places the greatest tensile strength of the belt section on the outside, where the tension is maximum as the belt passes over the pulley. The leather may be either oak-tanned or mineral salt tanned e. In order to increase the thickness of belt, the strips are cemented together.
The belts are specified according to the number of layers e. The leather belts must be periodically cleaned and dressed or treated with a compound or dressing containing neats foot or other suitable oils so that the belt will remain soft and flexible. Cotton or fabric belts. Most of the fabric belts are made by folding canvass or cotton duck to three or more layers depending upon the thickness desired and stitching together.
These belts are woven also into a strip of the desired width and thickness. They are impregnated with some filler like linseed oil in order to make the belts water proof and to prevent injury to the fibres. The cotton belts are cheaper and suitable in warm climates, in damp atmospheres and in exposed positions. Since the cotton belts require little attention, therefore these belts are mostly used in farm machinery, belt conveyor etc.
Rubber belt. The rubber belts are made of layers of fabric impregnated with rubber composition and have a thin layer of rubber on the faces. These belts are very flexible but are quickly destroyed if allowed to come into contact with heat, oil or grease. One of the principal advantage of these belts is that they may be easily made endless.
These belts are found suitable for saw mills, paper mills where they are exposed to moisture. Balata belts. These belts are similar to rubber belts except that balata gum is used in place of rubber. These belts are acid proof and water proof and it is not effected by animal oils or alkalies. The strength of balata belts is 25 per cent higher than rubber belts.
Types of Flat Belt Drives The power from one pulley to another may be transmitted by any of the following types of belt drives: 1.
Open belt drive. The open belt drive, as shown in Fig. In this case, the driver A pulls the belt from one side i. Thus the tension in the lower side belt will be more than that in the upper side belt. The lower side belt because of more tension is known as tight side whereas the upper side belt because of less tension is known as slack side, as shown in Fig. Crossed or twist belt drive. The crossed or twist belt drive, as shown in Fig.
In this case, the driver pulls the belt from one side i. RQ and delivers it to the other side i. Thus the tension in the belt RQ will be more than that in the belt LM. The belt RQ because of more tension is known as tight side, whereas the belt LM because of less tension is known as slack side, as shown in Fig.
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Belt rope and chain drives
Material used for Belts. Velocity Ratio of Belt Drive. Length of an Open Belt Drive. Power ransmitted by a Belt. Ratio of Driving ensions for Flat Belt Drive.
Views 8 Downloads 2 File size KB. All rights reserved. Date: File: Velocity of the belt 2. Tension under which belt is placed in pulley. Condition under which belt is used.
Introduction: The belts or ropes are used to transmit power from one shaft to another by means of pulleys which rotate at the same speed or at different speeds. The amount of power transmitted depends upon the following factors:. Types of Belts: 1. Flat belt : The flat belt is mostly used in the factories and workshops, where a moderate amount of power is to be transmitted, from one pulley to another when the two pulleys are not more than 8 meters apart. V-belt : The V-belt is mostly used in the factories and workshops, where a moderate amount of power is to be transmitted, from one pulley to another, when the two pulleys are very near to each other. Circular belt or rope : The circular belt or rope is mostly used in the factories and workshops, where a great amount of power is to be transmitted, from one pulley to another, when the two pulleys are more than 8 meters apart. Velocity Ratio of Belt Drive: It is the ratio between the velocities of the driver and the follower or driven.
Belt, Rope and Chain Drive
Belt drives are essential to many applications since they transmit power torque and speed. A variety of belt types are available. Each functions at different speeds and transmits different amounts of power.
Belt rope and chain drives. Download for free Report this document. Power from one shaft to another can be transmitted by means of belt, ropes, chains, gears etc. Belt drives are used when the distance between the shafts do not exceed more than 8m. Flat belt drive has basically three components namely driving pulley, flat belt and the driven pulley.
Стратмор попытался их удержать, но не сумел. За мгновение до того, как они сомкнулись, Сьюзан, потеряв равновесие, упала на пол за дверью. Коммандер, пытаясь приоткрыть дверь, прижал лицо вплотную к узенькой щелке. - Господи Боже мой, Сьюзан, с тобой все в порядке. Она встала на ноги и расправила платье.
V-belts are used for very close distance pulleys. Ropes or circular belts are used for 10m or more distance. The open belt drive is used with shafts arranged.
Но невозмутимость Стратмора, очевидно, подверглась тяжкому испытанию. - Кто тебе это сказал? - спросил он, и в его голосе впервые послышались металлические нотки. - Прочитал, - сказал Хейл самодовольно, стараясь извлечь как можно больше выгоды из этой ситуации. - В одном из ваших мозговых штурмов. - Это невозможно. Я никогда не распечатываю свои мозговые штурмы.
Когда двери автобуса открылись, молодые люди быстро вскочили внутрь. Беккер напряг зрение. Сомнений не. В ярком свете уличного фонаря на углу Беккер увидел. Молодые люди поднялись по ступенькам, и двигатель автобуса снова взревел. Беккер вдруг понял, что непроизвольно рванулся вперед, перед его глазами маячил только один образ - черная помада на губах, жуткие тени под глазами и эти волосы… заплетенные в три торчащие в разные стороны косички. Красную, белую и синюю.
Отчаянный парень, - пробормотал Хейл себе под нос. Он знал, что задумал Чатрукьян. Отключение ТРАНСТЕКСТА было логичным шагом в случае возникновения чрезвычайной ситуации, а ведь тот был уверен, что в машину проник вирус. К несчастью, это был самый надежный способ собрать в шифровалке всех сотрудников Отдела обеспечения системной безопасности. После таких экстренных действий на главном коммутаторе раздавался сигнал общей тревоги.
И этот вирус уже невозможно остановить - разве что вырубить электроэнергию и тем самым стереть миллиарды бит ценнейшей информации. Спасти ситуацию может только кольцо, и если Дэвид до сих пор его не нашел… - Мы должны выключить ТРАНСТЕКСТ! - Сьюзан решила взять дело в свои руки. - Я спущусь вниз, в подсобное помещение, и выключу рубильник. Стратмор медленно повернулся.