Another part of mixer design is the tank in which the mixer is used, since tank dimensions in. Shaft shown drives a gear set that is transmitting 5 hp at 1750 rpm. Mechanical design does not end with the shaft, since strength and practical issues remain for the impeller. Proposed mixer design is presented by the 3d models of its components, which were created by autodesk inventor software. This dissertation work is aimed to redesign existing single impeller agitator shaft by. Abstractthis paper describes the mechanical design of agitator to mixing. Agitator shaft deflection free download as pdf file. This dissertation work is aimed to redesign existing single impeller agitator shaft by using ss316 material with double impeller. Shaft stress calculations shaft 1 diameter38 material. Jan 18, 2009 design of shaft length of agitator posted in industrial professionals. Scale of agitation 1 is quite mild, 3 is normal, 6 is vigorous and 10 is violent.
Design and implementation of differential agitators to. Mechanical agitator power requirements for liquid batches. Design specification of the motor is then determined by. I wanted to calculate power consumption of agitator having 3 impellers installed on a single shaft and running at same speed. Relationship between torque and density in agitator. The product mixed is so sensitive, that is why that design has been used. This article explores the following topics related to shaft design. Shaft is verified by both analytical and fem method, resulting into similar output. 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. Torque shaft power fluid density shaft speed2 impeller diameter5 2 pi. A lifting mechanism for the agitator may be helpful.
Several standard designs materials to match the vessel. Agitator shaft length should be calculated on which basis. As per the design calculation existing agitator gb is designed for max. Agitatormixers providing tools for research and industry at a glance. Custom engineering of impeller design can be performed based on developed horsepower, viscosity, critical speed and other key factors associated with specific processes. A general result for the form of the fluid force equation can be developed. Design of shaft length of agitator industrial professionals. To design calculations at different viscosities illustrate the typical effect of viscosity on the required agitator power. In order to properly align the unit, it must be oriented so that the shaft is vertical. The calculation of the natural frequency for a mixer shaft requires considerable knowledge about the details of the shaft and impellers, including information about the impeller weights and the shaft bearings, which usually are inside the mixer drive.
Special properties for the customers benefit calculation, manufacture and design are in accord with pressure equipment. Longer shafts and larger impellers cause more severe loads on topentering mixers than portable mixers. This will be the case unless the shaft is overloaded or. Nov 08, 20 agitator design mechanical motor gearbox seal shaft impeller vineet. Chempute software nonpressurised tank and mixer design. The differential agitator is an electro mechanic set consists of. Agitator shaft deflection bearing mechanical gear scribd.
Oct 06, 2018 agitator shaft design calculation filetype pdf download. The calculus of the mixing rotating devices shafts based on the energonics method 109 on each mixer i i 1,n0 mounted on the shaft, a bending radial force acts either in the xoy plan being notedfy,i, or in the xoz plan being noted fz,i, depending on the mixer blades orientation as function of the chosen coordinate. Agitator design calculation free download as pdf file. By using the formula you gave on a precedent topic may 31, 2011, i estimated the reynolds 1. Introduction to nonnewtonian fluid and power requirement for nonnewtonian fluids d. Close clearance agitator highspeed impeller design layout of agitators. Roper design of impellers for inducing gas dispersion in fermenters is a widely published topic that has typically emphasized such issues as agitator power, liquid holdup and. It provides for the optimisation of stirrer power consumption as well as the. Predictable failures or lifetimes can be calculated although many parameters will vary and statistical considerations have to be taken into account. Apr 18, 2006 design of the mixer support must consider all of the mechanical loads on the mixer figure 1.
Review on design of agitator to optimize its performance. Designing for anomalies the first step in assessing a design is to calculate the power and torque absorbed by the proposed agitator. In both cases a twostage ekato viscoprop agitator system with an impeller diameter d 2 1100mm serves as basis for the calculations. Design of shaft length of agitator posted in industrial professionals. I attach a file with further information on the impeller design. The second step in the design sequence is the mechanical design of the mixer components. Just as allowable stress levels for shaft design must be. Mixer agitator mixtank calculators white mountain process. Recent articles have focused on the advantages that various impeller con. First, the torsion and bending loads, previously calculated for shaft design, must be used to design the mounting. Motor hp shaft diameter critical speed blade thickness. Design calculation of theoretical torque at slurry tank agitator. The work is carried out to reduce deflection by optimizing the design or by using different materials like ss, ss304 and ss305. The five primary variables of shaft design how to prevent fatigue failure in the gearbox shaft when and when not to use a steady bearing.
Shear stress and angle of twist of shaft under torsion. Multiduty mixer or universal mixer any mixing task requiring flow or shear any unit process or any unit operation from violent dispersions to gentle crystallisation all in same reactor vineet. Short term training programme on process engineering. Redesign and structural analysis of agitator shaft for. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Shaft is supported in selfaligning ball bearings and gears are both 10 pitch, 40 tooth, 20 spur gears. Student 2professor 1,2department of mechanical engineering 1,2msss cet, jalna abstractmixing is very important operation in any process industry. Review on design of agitator to optimize its performance rahul h. 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. This will be the case unless the shaft is overloaded or damaged. Agitation free download as powerpoint presentation. Key words paddle mixer design, phosphate fertilizer, autodesk inventor, fem abstrakt.
Vessel baffling is required for optimum performance. Jul 17, 2015 agitator power consumption calculation posted in industrial professionals. This research is to design and implement a new kind of agitators called differential agitator. In most agitators, the actual relationship between torque and density is. Predictable failures or lifetimes can be calculated, although many parameters will vary and statistical considerations have to be taken into account. Motor hp shaft diameter critical speed blade thickness coupling selection bearing selection for vessel. 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%. Process engineering mind mixer mechanical design chemical. We then calculate deflection, due to this force and impeller with hub acting at the end of. Impeller design for mixing of suspensions tomas jirout, frantisek rieger czech technical university in prague, faculty of mechanical engineering, department of process engineering, technicka 4, 166 07 prague 6, czech republic abstract this paper deals with effect of impeller type on offbottom particle suspension. The rotational speed is 100rpm, the viscosity 20 cp and the sp.
Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. Proven models of geometry as well as load cases that cover the unpredictable directions of tolerances and related forces are necessary. Do not attempt to support the shaft using the setscrews in the bearing or seal rotary part. Agitation and mixing of fluids purpose of agitation. Remove all shipping constraints and any protective covering on the mounting flange face. Shaft design is critical to the performance of your industrial mixer. Shaft design for industrial tank agitators thomasnet. It includes all of the features of cerebrotank, plus the complete design of tank agitators including impeller design and stirrer motor selection. Design and implementation of differential agitators to maximize agitating performance saeed asiri king abdulaziz university, 21589, jeddah, p. Find agitator shaft related suppliers, manufacturers, products and specifications on globalspec a trusted source of agitator shaft information. Consequently, it is impossible to analyze all combinations. S in pdf file costing purpose inputs moc of vessel shaft type of impeller motor hp cal.
Design stresses in shafts august 15, 2007 23 find the torsion in the shaft. The mixing arena is the boxing ring where chemist and chemical engineer fight in the work done. If an agitator is not correctly designed for these fluids, the mixture in regions near the walls can be completely stagnant. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings. Agitator design and selection standard engineers vineet. Btn agitators installation, operation maintenance manual. Agitator shaft design calculation filetype download in this method for tr amps agitator shaft design calculation filetype differ form your result dear pratim, the first agitator shaft design calculation filetype is based on the over all heat transfer coefficient of the reactor, this may vary based on scaling and fouling factors, and the second. Oct 27, 2018 agitator shaft design calculation filetype pdf download. The viscosity of newtonian media is independent of the agitator shaft speed or shear rate.
If you are not familiar with your companys mixing vessel entry procedure, contact your. This paper outlines the mechanical design procedure of a mixer based on the fluid. Static analysis calculate the effects of steady loading. Shaft design calculation pdf and generated in shaft and bearing calculations. Customer questionhow are industrial agitators and blender designs evaluated and agitator shaft design calculation filetype can i be sure that my process goals will. Jan 04, 2019 agitator shaft design calculation filetype pdf posted on january 4, 2019 by admin energy utilization in different types of agitators design calculations the mixer shaft is located off center onefourth to onehalf the tank radius, the resulting. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. The amount of data needed and generated in shaft and bearing calculations is huge. Determine suitability of shaft design andor necessary size of shafting. This paper describes the mechanical design of a mixer with the emphasis on the fluid forces that are. Food for thought you wanted to stir things up but, your mixing gave only agitation. 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.
The work is carried out to reduce deflection by optimizing the design or by using. This means that the powertospeed ratio is typically a square function. Calculates agitator speed and power requirement for a given reactor geometry and mixture properties. Our core business was and is the technical design and production. On internet i found articles for power consumption calculation for agitator with one impeller only. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. After making sure that the shaft is safe for the static analysis the optimization analysis of shaft will be started, finite element modelling has been performed using ansys11 to get the minimum weight design of shaft of differential agitator as shown in figure 3. 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.
Student 2professor 1,2department of mechanical engineering. Agitator shaft is important component of agitation system used in reactor pressure. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Various forces contribute to the load that a shaft must contend with. The calculus of the mixing rotating devices shafts based on the energonics method 109 on each mixer i i 1,n0 mounted on the shaft, a bending radial force acts either in the xoy plan being notedfy,i, or in the xoz plan being noted fz,i, depending on the mixer blades orientation as function of the chosen coordinate system. Anonymous 17 october at hello sir, i am chemical engineering student i agitator shaft design calculation filetype doing my final year calculatioon on extraction of oil from slurry in oil refineries. Agitator shaft design calculation filetype pdf energy utilization in different types of agitators design calculations the mixer shaft is located off center onefourth to onehalf the tank radius, the. Compare combined stresses to suitable allowable stresses. The fundamental approach is straightforward, design for power torque and speed, then shaft loads, and finally mixer dynamics.
Cerebro mix light non pressurised tank and mixer design cerebromix is used for the calculation of agitated nonpressurised process tanks. Characteristic of application requiring minimum fluid velocities to produce a flat but moving fluid batch surface. Agitator power consumption calculation posted in industrial professionals. The differential agitator is an electro mechanic set consists of two shafts. 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.
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