Lina colucci, dianhao luo, andrew mang and byung seok kwon date. But before getting into the complete design, the following design criterion need to be noted. Pdf shaft is a critical and standard component which is used normally in all. Economic aspects of chemicals wasted and cost of equipment. The sizes of parts and overall sizes of assemblies are conveyed by dimensions placed on the drawing. Shaft design is critical to the performance of your industrial mixer. Agitator shaft is a critical component used in reactor pressure vessel. E housing and shaft note notel note 2 note 3 grindstone dressing proper shaft machining methods how to minimize shaft wear. Shaft design introduction standard diameters of shafts torsion.
Agitator design and agitator systems about us we have figured it out stelzer ruhrtechnik is one of the leading companies in agitation technology and a soughtafter solutions partner for projectspecific process technology solutions. The differential agitator is an electro mechanic set consists of two shafts. In this paper, we have mainly focused on different types of agitator used in industries to increase the mixing performance. Student 2professor 1,2department of mechanical engineering 1,2msss cet, jalna abstractmixing is very important operation in any process industry. Our core business was and is the technical design and production. Redesign and structural analysis of agitator shaft for. Material selection usually steel, unless you have good reasons.
This dissertation work is aimed to redesign existing single impeller agitator shaft by using ss316 material with double impeller. Preliminary design of a power transmission shaft under fatigue. Finite element analysis fea used to calculate critical speed and shaft deflection. Review on design of agitator to optimize its performance.
They are used in everything from clocks to rockets and have been around for 3000 years. Mechanical design does not end with the shaft, since strength and practical issues remain for the impeller. Design of shaft design of solid shaft subjected to shear stress for selected motor power rated torque and maximum torque is calculated as given below. Hydraulic turbineshydraulic turbines raven mechanical. Figure 1 original plain thrust bearing design figure 2 new roller thrust bearing design. Efficient mixing for water treatment applications our turboxal agitator is a floating oxygenator that improves the efficiency of injecting pure oxygen into aeration basins of shallow water less than 5m or aerated lagoons, or in pools in which the installation of submersible. A large change in stiffness close to the top of the shafting where the small gearbox shaft is coupled to the large tank shaft concentrates the. Agitator shafts thrust bearing accendo reliability. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. I wanted to calculate power consumption of agitator having 3 impellers installed on a single shaft and running at same speed. Agitator power consumption calculation posted in industrial professionals. Cg209775 and cg2097100 are made from heavy wall tubing.
The viscosity of newtonian media is independent of the agitator shaft speed or shear rate. Design requirements drilled shaft design is performed by obs using the soils design sections s4 package. The main design considerations for choosing either electric traction drive or hydraulic for a particular project are the number of floors, the height of the building, the number of people to be transported, desired passenger waiting times and frequency of use. Other attachments include inlet and outlet lines, coils, jackets, and wells for thermometers. Ross multishaft mixers the worldwide standard for design and innovation ross is the leading manufacturer of multishaft mixers and has been since we introduced the original multishaft mixer over 80 years ago. Gears are mounted on rotatable shafts and the teeth are made to mesh engage with a gear on another shaft. The original design is shown in figure 1 and the new design in figure 2. The dimensions of shafts designed for fatigue or static strength are selected relative to the working stress of the shaft material, the torque, the bending loads to be.
Nfpa 285 standard fire test method for evaluation of fire propagation characteristics of exterior nonloadbearing wall assemblies containing combustible components 2012 edition reference. The welding flange is designed for welding into the tank. Vessel baffling is required for optimum performance. In both cases a twostage ekato viscoprop agitator system with an impeller diameter d 2 1100mm serves as basis for the calculations. Review on design of agitator to optimize its performance rahul h. The joint between the front plate and mating flange is. This research is to design and implement a new kind of agitators called differential agitator.
Pdf geometry and architecture of mixing agitator a. Standard design agitator lkr5 is fitted with a standard motor and the agitator shaft is directly coupled to the motor shaft. Example of spiral bevel gear design 6 oerlikon cycloid spiral bevel gear calculations design features. Provide factoryassembled and tested fan units consisting of housing, wheel, fan shaft, bearings, and fan drive. Norwegian design and construction experiences of unlined pressure shafts and tunnels published in international conference on hydropower.
Introduction shaft design city, university of london. This white paper explores the following topics related to shaft design. Lower portion of stirrer shaft is sandblasted and has a 38 wide flat. Another part of mixer design is the tank in which the mixer is used, since tank dimensions in. The mixing arena is the boxing ring where chemist and chemical engineer fight in the work done. Introduction to nonnewtonian fluid and power requirement for nonnewtonian fluids d. The basic objective in dimensioning a drawing is to give the manufacturing or construction personnel the dimensions they need to do their work without requiring them to add, subtract, or estimate distances. The shaft is generally acted upon by bending moment, torsion and axial force. Any type of shock or impact should be avoided as the carbon seal element is easily damaged. Designed to utilize cg2095 and cg2096 ptfe agitators.
In design it is usually possible to locate the critical areas, size these to meet the strength requirements, and then size the rest of the shaft to meet the requirements of the shaftsupported elements. Service limit state design of drilled shaft foundations includes the evaluation of settlement due. The bearing sat in a bracket bolted under the top of the tank and the shaft was coupled to the gearbox. The loads are active and are transmitted from the impeller blades to the agitator shaft and then to the gear box. Design of shaft primarily involves in determining stresses at critical point in the shaft. Today, ross operates five plants in the usa, along with ross owned plants in china and india. A291 a291m19 standard specification for steel forgings, carbon and alloy, for pinions, gears and shafts for reduction gears. The first shaft is the bearing axis while the second shaft is the axis of the quartet upper bearing impellers group and the triple lower group which are called as agitating group. Provide with a cast iron back plate or imbedded hub in the wheel and keyed to a polished steel shaft.
The first step is process design from a chemical viewpoint and involves the specification of the impeller pattern, speed, temperature and blade angle. Bending moment is the hydraulic force fh acting on a shaft at a length away from the bearings perpendicular to the axis of rotation. Contents preface acknowledgements introduction 1 crown wheel and pinion. The first shaft is the bearing axis while the second shaft is the axis of the quartet upper bearing impellers group and the triple lower group which are called as agitating. Design specification of the motor is then determined by. Lower shaft through vessel nozzle into tank and support with approximately 8 inches of shaft extending above the vessel flange. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. There is a bracket and a front plate between the motor and the welding flange. The new arrangement lasted only 8 months before the thrust ball bearing collapsed. A hole is drilled centrally through the whole length of the shaft. Grease replenishing system for highspeed spindles finelub ii. Agitator shaft length should be calculated on which basis. Design of shaft should be carried out with consideration of fatigue and. An analysis of stress and impact when the impact load creates on roller shaft with the help of hypermesh when the angle is increased to 17 degree.
Simply supported shafts have zero slope in the middle and thus help maintain tracking. Super precision sealed angular contact ball bearings. Thus, a single housing can be transformed into a variety of applications and mounting. Compare combined stresses to suitable allowable stresses. Evren toygar 2006 fracture and fatigue analysis of an agitator. Design and implementation of differential agitators to. The work is carried out to reduce deflection by optimizing the design or by using different materials like ss, ss304 and ss305. Bearings catalogs and cad drawings services nsk global. Blue plains tunnel shaft design and construction description of innovation tsjd, a joint venture of traylor bros. Conservative mechanical design criteria for strong shafts severe duty design operating below 65% of first critical speed.
Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. Nskhps high performance standard bearings for industrial machinery. Agitator design and selection standard engineers vineet. Agitator is one of the important parts in the mixing process. Proper and uniform mixing gives improved quality of the product. The second step in the design sequence is the mechanical design of the mixer components. The fundamental approach is straightforward, design for power torque and speed, then shaft loads, and finally mixer dynamics. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings. Drilled shaft foundations should be designed at the service limit state to meet the tolerable movements for the structure. Spur gear creation american society for engineering.
On internet i found articles for power consumption calculation for agitator with one impeller only. The five primary variables of shaft design how to prevent fatigue failure in the gearbox shaft when and when not to. Agitator design is often though as the application of two engineering disciplines. Design of shaft length of agitator posted in industrial professionals. Never lift the agitator using the extension shaft as a lift point. Precision ground and polished stirrer shaft for use with chemglass process reactors. The formulae for stressing these shafts are given, to enable the size of the shafts to be. I am asking this because on low level alarm 20 % of tank, agitator is not getting immersed in liquid resulting in frequent damage to bearing due to vibration so we have changed alarm value to 50% instead of 20%.
Bending moment causes the shaft to bend away from the central rotational axis and is critical to determine the shaft material, diameter and bearing design. Btn agitators installation, operation maintenance manual. Fatigue, fatigue failure, fatigue analysis, shaft design. Food and beverage processing, paper and pulp processing, water wastewater. Figure 881 shows a typical standard tank figure 81. Given constraint and dimension specifications for a tensioner shaft, we had to take fatigue, stress concentration, standard part availability, and manufacturing considerations into account to finalize and. The modular construction design enables installation of additional equipment onto the housing. I offer design and drawing program which designs and draws a detailed drawing of agitator mixer, with user friendly dialog boxes, which is an addon for any cad program for designing and developing ga drawing for agitator mixer. Mechanical agitator power requirements for liquid batches. A good industrial mixer design cannot use a gearbox that has an output shaft significantly smaller than the mixer in tank shaft, even if the overall critical speed of the system would be sufficient.
Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Standard specification for steel forgings, carbon and. Food for thought you wanted to stir things up but, your mixing gave only agitation. Short term training programme on process engineering.