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| Coal Handling in Thermal Plant |
The Coal Handling Plant is one of the most critical part of a coal based thermal Power generating station. The huge amount of coal is usually supplied by railways.A railway siding line is taken into power station and the coal is delivered in the storage yard.The coal is unloaded from the point of delivery by means of Wagon Tipplers. The coal is taken from the unloading site to the dead storage by means of Belt conveyors. The belt deliver the coal to 0 meter level and further move to transfer points.The transfer points are use to transfer coal to next belt.The Belt conveyors elevates the coal to Breaker /Crusher House.
The Gear Boxes are used for speed reduction and the application of desired torque. Most of the material handling equipment drive coupled with the gear box and the equipment. The Gear Box types and design are as here under.
The Gear Boxes are used for speed reduction and the application of desired torque. Most of the material handling equipment drive coupled with the gear box and the equipment. The Gear Box types and design are as here under.
GEAR BOXES
The gearbox that uses gears and gear trains to provide speed and torque conversions from a rotating power source to another device.
TYPES OF GEAR BOXES:
1.Worm Reducers :
2.Helical Gear Boxes:
These include single to multiple stage ranging from Spur,Helical,Bevel Helical and Helical worm gears:
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HELICAL GEAR BOX -TWO STAGE
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 SV Gears is a well known organization occupied in offering our clients with a quality range of Gear our range of Industrial Gears includes Bevel Gears, Helical Gears, and Worm Gears. The gears are usually found in round shape or in disc form. Spur Gear has radial tooth projections. The leading edges of the teeth are joined in parallel to the spindle of rotation. When these gears are fitted to parallel rod, then only these gears can be entwined properly. We obtain best quality raw material for manufacturing our products. We use top quality steel rounds and a corrosion-resistant bronze for making high strength Spur gear. These raw materials are obtained from the renowned and dependable vendors and suppliers of India and abroad. The raw materials are vigilantly checked by our quality expert before using them in the final products to guarantee top quality we have gained proficiency in designing and manufacturing spur gear |
Design and manufacturing of gears
Gear
A gear is a rotating machine part which has cut teeth, that mesh with another toothed part in order to transmit torque. The cut teeth are also called 'cogs'. Gears are one of the most important parts of any machine or a mechanism. Some of the sectors in which gears play a vital role are:
- Turbine plant
- Hot and Cold Rolling
- Construction machinery
- Elevator industry
Standard system of Gear Teeth
In a gear drive, two types of curves, the cycloidal and the involute, are generally used. In a gear drive, the shape of the tooth depends upon the pressure angle. Gears of involute profile with 14.5°, 20° full-depth and 20° stub pressure angles are most commonly used in industries. A 20° pressure angle full-depth involute gear tooth has various advantages over the other pressure angles. BIS has recommended the use of 20° pressure angle full depth involute gear tooth.
the output of a gear depends on the accuracy of its design and manufacturing. The correct manufacturing of a gear requires a number of prerequisite calculations and design considerations. The design considerations taken into account before manufacturing of gears are:- Strength of the gear in order to avoid failure at starting torques or under dynamic loading during running conditions.
- Gear teeth must have good wear characteristics.
- Selection of material combination.
- Proper alignment and compactness of drive
- Provision of adequate and proper lubrication arrangement.
Selection of Materials
The gear material should have the following properties:
- High tensile strength to prevent failure against static loads
- High endurance strength to withstand dynamic loads
- Low coefficient of friction
- Good manufacturability
Generally cast iron, steel, brass and bronze are preferred for manufacturing metallic gears with cut teeth. Where smooth action is not important, cast iron gears with cut teeth may be employed. Commercially cut gears have a pitch line velocity of about 5 metre/second. For velocities larger than this, gear sets with non-metallic pinions as one member are used to eliminate vibration and noise. Non-metallic materials are made of various materials such as treated cotton pressed and moulded at high-pressure, synthetic resins of the phenol type and rawhide. Moisture affects rawhide pinions. Gears made of phenolic resins are self-supporting on the other hand other two types are supported by metal side plates at both ends of the plate. Large wheels are made with fretting rings to save alloy steels. Wheel centre is commonly cast from cast iron. The ring is forged or roll expanded from steel of the respective grade specified by the tooth design.
Gear wheel proportions
A gear has three important parts
- Hub
- Web or arms
- Rim
Hub of gears are of two types, solid or split. The advantage of split hub is that it reduces the cooling stresses in the gear and facilitates the mounting of the gear on the shaft. The solid hub gear is to be mounted overhung on the shaft. The key is placed under the arm in case of solid hub while in case of split hub, the key is placed at right angles to the hub joint. Small gears up to 250 mm pitch circle diameter are built with a web, which joins the hub and the rim. The thickness of the web of the gear should be such that it is capable of transmitting the torque without shearing off at the hub where it joins. The gear is designed such that the thickness of its web is equal to half the circular pitch. Gear of larger diameter are provided with arms. The number of arms depends on the pitch circle diameter of the gear. Following are the prevailing practices of the number of arms and gear diameters
| Gear diameter(mm) | Arms |
|---|---|
| 300-500 | 4-5 |
| 500-1500 | 6 |
| 1500-2400 | 8 |
| >2400 | 10-12 |
Welcome to Gear’s manufacturing one stop solutions right from concept designing to final production & performance testing. We cater to industrial needs for power transmissions! Top Gear has hard won reputation for quality products & production excellence through highly skilled & trained workforce of more supported by more than Sub Contractors.
Gears manufacturing is one of the world leaders gears technology. It bring to you the finest in gear and transmission technology in financial and technical collaboration. Our guiding principle since then has been always “Quality Gears”. Slowly but steadily our business expanded. So also the quality, range, customers and services. Soon, we became the No. 1 (loose) gear manufacturer in the country both in terms of quality and volume.
We are committed to continuous improvement, 100% customer satisfaction and look forward to working with you to solve your demanding needs. We do believe we can start building a history with your company and include your name to our list of many satisfied, privileged customers continuing to be the best source for all your gearing needs. Our ability to manufacture gearing products which meets the latest industry standards and demanding customer requirements has paved way for a diverse list of clients.
