Sunday, 22 June 2014

Facts of Single Disc Scrubber Machines

Single disc scrubbers are the most versatile, multipurpose and general machines for maintenance and cleaning of all types of floors and carpets. As the name implies, it uses a single rotating disc which works on the floor to clean it. Different pads, rotation speed and motor power can provide the solution for any floor cleaning application: floor cleaning, scrubbing, polishing, marble/granite restoration, crystallization, buffing, spray buffing, scarifying, scouring, sanding, stripping, carpet shampooing, wooden floor sanding etc.

Theoretically, a single disc floor machine is a low speed machine with a horizontally rotating head attached to a large, round scrubbing pad or floor scrubbing brush which spins in a circle in one direction. The spinning of the pad or brush is powered by a small motor, ideally mounted directly over the centre of the machine head to distribute equal pressure on all sides of the brush or pad for proper scrubbing. Most scrubbers come equipped with solution tanks that can squirt floor cleaning solution directly into the scrubbing pad and onto the floor. Scrubbers are made to spin at a variety of speeds. The speed at which the pad or brush rotates directly affects the kind of floor cleaning job to be done.

Single disc scrubbers operate in a side to side or “swing” motion and are designed to handle scrubbing jobs, when the floor has in-ground dirt. Depending upon the accessory chosen, these machines can be used to remove old polishes from worn out floors or grind floors to bring a mirror shine finish on the same floors. Single speed scrubbers usually rotate at output speeds from about 150 to 175 revolutions per minute (RPM). Dual speed scrubbers will go from about 150-350 RPM. With new forms of engineering technologies coming in, many manufacturers have started producing variable or multiple speed floor scrubbers in which the brush/ pad speed can be regulated to suit the floor/ carpet maintenance operation being performed.

Single Disc Scrubbers

Criteria for Selection

The selection of a floor cleaning machine firstly depends upon many factors such as the cleaning operation that needs to be performed, dirt or stain prevalent on the floor, the area to be cleaned, the layout of the area, manoeuvrability of the machine to perform cleaning operations and presence of human traffic during cleaning hours. Usually, where no other machine can be suggested, a single disc scrubber can be the most general purpose machine to be used for any floor cleaning operation. The mechanical action of the floor cleaning process takes into account factors such as motor power, brush speed, brush orientation, weight on the brush and brush aggressiveness. Single disc scrubbers can be evaluated based on the following factors:

  • Motor Power: This defines the strength of the motor to rotate the brush. As the situation becomes more difficult for the brush to rotate, higher should be the power of the motor. For example, for someone doing marble crystallization or dry buffing or carpet shampooing, the friction caused between the floors and pads is higher than the routine floor cleaning operation thereby obstructing the pad to move smoothly. In such circumstances, the motors with higher power will facilitate the pad or brush to rotate despite the resistance provided by the floors. Also, if the operation hours are longer, higher motor power will be more helpful.
  • Brush/ Pad Speed: Every floor or carpet maintenance operation can be optimized with the ideal brush speed of the machine. For those who need to perform multiple operations, there are options of using single speed, 2-speed, 4-speed and variable speed machines.
  • Drive: Usually, the motors rotate at a speed of 1440 RPM, but the brush or pad cannot be allowed to rotate at such high speeds for operator safety. Between the motor and the brush, there is always a speed or motion transmission system, which is usually a gear drive or a belt drive. The more the speed reduction ration, higher is the power transmitted to the machine from the motor. Machines with belt drives are the easiest to design, comparatively cheaper, noiseless and easy to replace. However, since they are not able to produce lower speeds and transmit more power to the brush, they are more suited for easier applications like floor cleaning. For other operations such as carpet shampooing, crystallization, scarifying, marble restoration etc, gear driven machines are most suitable. With gear drives, the speed reduction ratio is higher; therefore the force transmitted to the machine from the motor through the gear drive is higher. Gear drives can also be of different types and planetary gear drives are known to transmit maximum power to the machine.
  • Brush size: If the area to be cleaned is too large, a smaller brush will take too long for cleaning and will render the cleaning job highly inefficient and time consuming. It will be a waste of the labour and money. Therefore, selecting the machine with the right brush size is most important. Most machines are available in 12”, 15” 17” and 20”. It is suggested that machine should be chosen of such a size which would support floor pads which are of fixed sizes as well.
  • Weight and stability: Although single discs require operator skills to balance rather than lift it, weight still plays a crucial role for the machines. Brush pressure is important as the right kind of pressure applied on the brush or pad can optimize the cleaning result. Machine weights should be kept as low as possible without compensating the application. Higher weights can cause operator fatigue when working for longer hours. For carpet shampooing for example, higher weights are not advisable as the extra weights may not let the pile of carpets stand up. But when grinding needs to be performed on the floors, with higher weight, the grinding results will be faster, better and more uniform. If the motor is mounted on the centre of the base of the machine right above the centre of the brush, then the pressure distributed on the base will be equal on all sides. This will help in uniform cleaning, polishing and grinding results and better stability of the machine thereby causing lesser fatigue to the operator.
  • Vibration: At higher weights or higher speeds also, the machine should be stable and should not cause vibrations. The machine operator could benefit from a lower level of vibrations – enabling the machine to be used for longer periods with minimum operator fatigue.
  • Noise: Many single disc cleaners also enable the cleaning process to blend more into everyday working practices by offering a far lower noise option than many other types of floor cleaning machines. This ensures that floor cleaning tasks are able to be undertaken during working hours with minimal disruption to the surrounding workforce and therefore reducing the cost of the machine operators’ overtime or out of hours allowance.
  • Accessories available for use with the machine: The machine should be compatible with all types of accessories so that it can be used for various applications. Except for the pads, most brushes for the machines are to be supplied by the manufacturer of the machine itself. Therefore, it should be checked first as to what are the accessories that will be provided with the machine and optionally.
  • Availability of spares and services from the supplier: Spares and services should be readily available, as longer down times for the machines means loss of revenues to the service providers. Doing a background check for availability and cost of spares will always be helpful in the smooth operations of the machines in years to come.
  • Reputation of the manufacturer: Every manufacturer in the market has certain products which are their core strengths and some products that are only to complement their product portfolio to make it an all round package. But if they are not known to supply some machines with the same quality they are usually associated with, their single disc scrubbers can be avoided.

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