The role of ergonomic office chairs in improving the productivity of the office is often neglected. Only in the recent times we can find corporate and semi corporate companies trying to understand the importance behind this concept. Since corporate and semi corporate companies want to utilize the maximum productivity, they are always on the front to find out ways to improve productivity of their staff.
As a result we can find that the demand for ergonomic chairs is increasing in the recent times as globalization is on rise.Comfort of the EmployeesOnly when the employees of an organization are comfortable in their work space, they can be able to give their best. This can be affected by lot of factors including the shape and comfort of their seats i. e.
chairs. You cant expect best ideas from an employee who is not even comfortable to sit in his chair properly. Now you can estimate the loss your company might incur when your employees are not comfortable in their positions.Dont jeopardize your Employees HealthKeeping aside the productivity aspect to the side for some time, using regular office chairs will cause back pain and neck pain to the employees in the long run.
That means, it is going to effect the health of the employees in the long run and more importantly this kind of changes are irreversible in most cases and hence the person might have to suffer from the condition all through his life. So, dont jeopardize with the health of your employees just by looking for some small amount of money. Purchase ergonomic Office Chairs to make your employees comfortable in their positions and to prevent health complications to them in future.
Long Working Hours in front of ComputersThanks to the modernization of our society, most of our professions are related to sitting jobs these days. Computers have encroached to almost all parts of our lives and the result is that we are forced to sit in front of computers all through the day for doing our jobs. In this context, it has become necessary to take care of our health as there is less scope for physical movement and exercise.
In order to acquaint ourselves for long working hours in front of the computers, we need to ensure that our sitting position i.e. office chairs are good enough and that they can prevent back pain, spinal injury, neck pain, etc which are otherwise common. Recent increase in the number of spondylitis cases show us the need to focus on improving office environment through Ergonomic Chairs.
Improved ProductivityThose corporate and semi corporate companies who have envisioned this aspect well before others, have started reaping the benefits through improved productivity. This confirms that employees who are comfortable in their work spaces will be able to provide better productivity to the company on the whole. So, make no delay.
Invest in Ergonomic Chairs for your office and improve your office productivity by many folds. Its never too late to make the right decision RELATED QUESTION What is the best ergonomic office chair within a 10k budget in India? It feels good that people are now looking for office chairs designed ergonomically.
keeping right posture of back and health at the same time has been observed before making a purchase which is indeed an aspect to watch for.Market of ergonomic chairs have got utterly hampered by the non standard roadside low quality chair retailers offering good looking chairs right from Indian rupees 800 to 5000, however all these chairs requires re purchases or frequent maintenance, moreover it damages the entire backbone and causes permanent pain and hospital expenses worth much higher then an excellent ergonomic office chair price. I would like to suggest here Indias best chair manufacturer known for ergonomic designed and has biggest clientele in Indian Market including Indias giant organisations.Bluebell Ergonomics Pvt LtdWith a variety of office chairs includingPremiums chairs|Executive chairs|Workstation chairs|Visitor chairsMore importantly all these chairs areergonomically designedand highly durable due to itshigh quality materialand machinery used for manufacturing (I have purchased 180 units for my office staff, and above information is based on the same).Variety and beautiful color options adds an extra grace to the workplace which eventually works well for the performance of the company as well due to happy vibes inside the company. Also it is worlds first ever company to implement the concept of 7 chakras into their designs, and the vibes of this physiology is easily observable.ADJUSTMENTS360 Degree Rotation offers more flexibility towards multitasking.
Efficient gas-lift mechanism offers desirable up down adjustments depending up on table specifications. FABRICUse of various material which are ideally used to stop back irritation due to over sweating. A sleek and thin fabric creates enough comfort and cushion.
This allows an employee to sit for longer duration with no problems at all. 7 CHAKRASThis is an exclusive USPs that only Bluebell Ergonomics Pvt Ltd offers in the world, Understanding the significance of 7 chakras in Indian tradition spreads a positive physiology towards working culture which then leads to impressive company performance eventually.DISCOUNTS & OFFERSBluebell has impressive discounts on every product on their official website andspecial offers on B2B Purchases.AVAILABILITYBluebell chairs are easily available on other E-Commerce site such as:AmazonFlipkartIndustrybuyingIndiaMartBluebell Ergonomicsand etc. I highly recommend Bluebell Ergonomics Pvt Ltd for anyone who looks for quality products.
Do have a small comparison between other companies and Bluebell to finalize your decision but do not seek quality chairs on roadside shops. it eventually becomes expensive to you unnecessarily.
Some familiar examples of uses are the strong, helical torsion springs that operate clothespins and traditional spring-loaded-bar type mousetraps. Other uses are in the large, coiled torsion springs used to counterbalance the weight of garage doors, and a similar system is used to assist in opening the trunk (boot) cover on some sedans. Small, coiled torsion springs are often used to operate pop-up doors found on small consumer goods like digital cameras and compact disc players. Other more specific uses:
A torsion bar suspension is a thick, steel torsion-bar spring attached to the body of a vehicle at one end and to a lever arm which attaches to the axle of the wheel at the other. It absorbs road shocks as the wheel goes over bumps and rough road surfaces, cushioning the ride for the passengers. Torsion-bar suspensions are used in many modern cars and trucks, as well as military vehicles.
The sway bar used in many vehicle suspension systems also uses the torsion spring principle.
The torsion pendulum used in torsion pendulum clocks is a wheel-shaped weight suspended from its center by a wire torsion spring. The weight rotates about the axis of the spring, twisting it, instead of swinging like an ordinary pendulum. The force of the spring reverses the direction of rotation, so the wheel oscillates back and forth, driven at the top by the clock's gears.
Torsion springs consisting of twisted ropes or sinew, were used to store potential energy to power several types of ancient weapons; including the Greek ballista and the Roman scorpio and catapults like the onager.
The balance spring or hairspring in mechanical watches is a fine, spiral-shaped torsion spring that pushes the balance wheel back toward its center position as it rotates back and forth. The balance wheel and spring function similarly to the torsion pendulum above in keeping time for the watch.
The D'Arsonval movement used in mechanical pointer-type meters to measure electric current is a type of torsion balance (see below). A coil of wire attached to the pointer twists in a magnetic field against the resistance of a torsion spring. Hooke's law ensures that the angle of the pointer is proportional to the current.
A DMD or digital micromirror device chip is at the heart of many video projectors. It uses hundreds of thousands of tiny mirrors on tiny torsion springs fabricated on a silicon surface to reflect light onto the screen, forming the image.
if automatic doors have to be provided air conditioning has to be also provided otherwise people will suffocate and fall in train coaches.crowd like Mumbai suburban system the doors cannot be closed with people always trying to get in train when automatic door closing and opening is provided. ushers have to be employed to push people into coaches in order to close the doors which is costly for railways as well as passengers.
If all doors of trains to be automatically, it will cost a lot of money for railways. Railways will pass it over to travellers. Most of Indian travellers are spending more than 10% of earnings on travel.
It will be a burden for them.
Not just cost of the doors.
Also the lost income to the railways due to less people travelling as there would be no foot board space available.Sceptical about the quality. Look at the quality of our train rakes. New rakes look acceptable only for few years and not maintained later. I remember traveling in a train with one window not closing fully and it was peak winter in Delhi area.
If something like that happens with automatic doors, it could be quite big problem.Doors will be broken to make space for travelling. People travel on footboard not because they want to travel that way.
Generally, that happens due to insufficient space inside. We do not have sufficient number of trains to cater to the demand existing. One can think of automatic doors after we are able to meet the unmet demand for the trains.
Why automatic closing doors in Indian Railways are not successful?
With any variable frequency drive application, the critical parameters are TORQUE - what's the worst-case torque? - and SPEED.Your application is 0.55kW over a span of 50-300RPM. Assuming your mechanical variable speed drive is either a variable belt drive or a disc drive, it is a torque-multiplying drive where the available output power is constant as the speed changes. 0.55kW at 300RPM is 17.5 N-m, while the same 0.55kW at 50RPM is 105N-m. Then it gets worse. A three-phase AC motor is capable of producing much more torque at start than it can output continuously.
Exactly how much more is dependent on the design of the motor, but generally 150-250% of full-load torque is available at start. Not taking this into account results in a lot of misapplied inverter/motor systems because that torque is not available from an inverter unless the inverter is sized to deliver a lot more current.The question then becomes "what is the worst-case condition?" That is, where do you need the most torque when operating your machine? Let's say your equipment is an industrial mixer, and stipulate that it MUST be started with the mechanical variable speed drive at its slowest setting when loaded with materials or it will fail to start.
The worst-case torque condition then would be (assuming 200% starting torque available) 2 x 105 N-m, or 210 N-m. To properly size a VFD/motor combination, your system MUST be able to produce 210 N-m. Typically, an industrial-duty VFD unit is rated to put out a certain amount of current continuously, and 150% of that rating for 60 seconds.
A drive designed for pump and fan applications may only be rated for 110% overload for 60 seconds. When operating a motor on a VFD, output current is (for all intents and purposes) equivalent to torque.So, what size motor do we need to produce 210 N-m at start? If 210 N-m is 150% of the motor's full-load rating, the motor full-load torque would be 140 N-m.
Assume we're going to use a four-pole 50Hz rated motor with a nameplate rated speed of 1475RPM. One hundred forty N-m at 1475RPM means 21.6kW. The closest standard rating is 22kW.Wait, what? The old system uses a 0.55kW motor, and the new one requires a 22kW motor? Welcome to the wonderful world of mechanical torque multiplication.
Remember, your maximum speed is 300 RPM. You don't want to operate an induction motor at full-load current over a maximum range of 50-300RPM if you can possibly avoid it. You don't want just a motor, you want a motor with a gearbox.
Such as a motor/gearbox combination with a rated output speed of 300 RPM and a rated continuous output torque of 140 N-m. Plug those numbers into the equations and the motor rating drops to 4.4kW. The closest standard rating is 5.0kW. Yes, the motor is almost 10x the size of the original, but that is what is required to ensure that the system will start under the worst possible condition.
But wait! There's more! Once the system is started, the torque required to run it falls off rather dramatically, since the current system with the 0.55kW motor can spin the output shaft at 300 RPM while producing no more than 17.5 N-m of torque. One advantage of variable-frequency drives is that you can operate the motor at OVER the nameplate frequency, so long as the motor is mechanically capable of handling the overspeed condition, and the motor does not draw more than the nameplate full-load current.
How about a motor with a gearbox rated 140 N-m at 200 RPM? Now the motor size drops to 2.9kW, and the closest standard motor is 3.0kW. Were it me, that's the size I'd select. To get 50-300 RPM out of the system, the VFD would operate between 12.5Hz and 75Hz. However, at 75Hz the motor/gearbox combination would be capable of providing 95 N-m.
In other words, the motor would be very lightly loaded. Still not what I'd consider ideal, but getting closer. Play with the gear ratios, possibly the motor full-load speed, and an optimal solution can be found.
Now, what if the application is a conveyor belt? A conveyor is a constant-torque application. That is, it requires the same amount of torque regardless of the speed, with the singular exception of - once again - starting. However, let's say in this application the conveyor can be started with the mechanical variable speed drive in its highest speed setting, so now the worst-case torque is 2 x 17.
5 N-m, or 35 N-m.
Again, your maximum shaft speed is 300 RPM and minimum shaft speed is 50RPM, so some gear reduction is needed to keep the new motor operating somewhere reasonably near nameplate speed. Again, let's assume a four-pole motor with a 1450RPM nameplate rating at 50Hz. 1450/300 yeilds 4.83:1 reduction, so either a gearbox, V-belts and sheaves or a chain drive can be configured to get us 5:1 reduction (and 5x torque multiplication).
With a starting torque requirement of 35 N-m at the conveyor, we divide by 5 to get the starting torque requirement at the motor shaft - 7 N-m. Seven Newton-meters represents 150% of the motor full-load rating, so 7/1.5 = 4.67 N-m rated at 1450RPM, or 0.71kW. The closest standard rating is 0.75kW. So, a 0.75kW motor, a 5:1 gear reduction and a 0.75kW inverter are required. So we have two applications for your 0.55kW mechanical variable speed drive, and the inverter/motor replacements are VASTLY different.
Application is everything, because application defines the worst-case torque requirements. I've been doing this for a living for more than 25 years now, and I've replaced a LOT of misapplied drive systems where worst-case torque was not properly considered. Hope this helps.What is the best practice or strategy to replace a mechanical variable speed drive asynchronous motor with a regular asynchronous motor and a frequency inverter?.
The operation of the motor can be understood by referring to figure which shows one pole of the motor with a shading coil. Considering a cycle of alternating current (fig 1) applied to the stator winding we will explain the working of shaded pole motor.During the portion OADuring the portion OA of the alternating-current cycle [Fig 1], the flux begins to increase and an e.
is induced in the shading coil.
The resulting current in the shading coil will be in such a direction (Lenzu2019s law) so as to oppose the change in flux. Thus the flux in the shaded portion of the pole is weakened while that in the unshaded portion is strengthened as shown in figure 2.During the portion ABDuring the portion AB of the alternating-current cycle, the flux has reached almost maximum value and is not changing.
Consequently, the flux distribution across the pole is uniform [See Fig 3] since no current is flowing in the shading coil.During the portion BCAs the flux decreases (portion BC of the alternating current cycle), current is induced in the shading coil so as to oppose the decrease in current. Thus the flux in the shaded portion of the pole is strengthened while that in the unshaded portion is weakened as shown in Fig 4.
The effect of the shading coil is to cause the field flux to shift across the pole face from the unshaded to the shaded portion. This shifting flux is like a rotating weak field moving in the direction from unshaded portion to the shaded portion of the pole.The rotor is of the squirrel-cage type and is under the influence of this moving field.
Consequently, a small starting torque is developed. As soon as this torque starts to revolve the rotor, additional torque is produced by single-phase induction-motor action. The motor accelerates to a speed slightly below the synchronous speed and runs as a single-phase induction motor.
What is the principle and operation of a shaded pole motor?
Centrifugal blower is a kind of driven fluid machinery, which relies on the mechanical energy input to increase the gas pressure and discharge gas side by side. Centrifugal blowers are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induction of boilers and industrial furnaces; cooling and ventilation of air-conditioning equipment and household electrical appliances; drying and selection of grain; ventilation and propulsion of wind tunnels and hovercraft.RAETTS(Dongguan Ruitian Electrical Technology Co.
) is one of the leading professional manufacturer of high speed centrifugal blower and air knife drying system in China.If you want to buy centrifugal blowers or air knives, RAETTS is your good choice.Website:www.raettsgroup.comWhat is a centrifugal blower?
It is a DTMF based automatic door locking system.The DTMF device makes it entirely remote control system. This DTMF device is controlled by the mobile phone from any location.
The principle of this device is that, when you make the call to the DTMF device, it automatically receives the call.Then the DTMF tones generated from that device are received by the microcontroller. When the call is connected, you can type the door opening as well as the locking code from the keypad of your phone.
This code is sent to the microcontroller in the form of DTMF tones, which directs the circuit to close as well as open the door.For detailed explanation of the working of this device, please visit the official kitsguru store.Free YouTube Video link:-What is the working principle of DTMF controlled automatic door locking system?.