When washing clothes, the drum rotates clockwise for about 10- 15 seconds at a speed of 25-60 revolutions per minute, stops for 3-6 seconds, and then rotates counterclockwise for 10- 15 seconds, and continues to repeat until the washing and blanching procedures are carried out.
Clothes are constantly thrown down in the drum, which combines the basic principles of hand washing such as rolling and kneading. Because the drum itself will turn the clothes upside down, the key role of water is to wet the clothes, not to float them, so the water level in the drum does not have to be higher than the clothes.
Not only has the basic washing and drying function, but also some models and specifications have the function of drying clothes, and it can be carried out in the same drum. Generally, it is equipped with a heating line, which can heat drinking water, improve the actual effect of laundry with warm boiled water and boiled water, or save energy only by using the temperature of drinking water. Some models do not have a separate temperature control button. In addition, many models are limited by the fully intelligent programming of washing machines, and when washing functions such as "direct speed" are adopted, special water temperature will be forced to be used for washing.
Because this washing method is not easy to produce super recoil, and combined with a variety of hand washing methods, it does the least damage to clothes and is the cleanest of the three. Most commercial washing machines choose drum design. Suitable for cleaning clothes with high requirements, such as wool, silk and satin materials.
Most of them have "pre-washing" function. First, introduce cold water and laundry detergent. After about 15-30 minutes of pre-washing, the wastewater in the pre-washing process is discharged, and then new cold water and another laundry detergent are automatically introduced to improve the cleaning effect of particularly dirty clothes.
According to the basic principle of laundry, drum washing machine saves water demand and detergent demand compared with stirring and dual-power washing machines. Because the water level line in the drum can be washed without soaking clothes, the general water demand is about one-third of that of a dual-power washing machine.
The user can set the speed ratio of the drying process (from 180-2000 rpm, depending on the model specifications), but some models and specifications do not provide the speed ratio setting.
Even if there is no water in the drum, the clothes in the drum can be turned over only by the rotation of the drum. In addition to saving water in washing, it is also very easy to integrate drying treatment into washing machine. Therefore, most washing machines with blow-drying function are drum-type design schemes.
If the front type with a relative height of about 80-85cm is adopted, there are many models and specifications that can be assembled under the whole cabinet. A part of the front washing machine can be used as an indoor space for assembling the dryer.
Because all rollers have to bear the weight of clothes and water and rotate constantly when washing clothes, the design scheme of damping system software is more complicated. Coupled with the embedded heating wire and relatively high water temperature, it is generally more expensive than a dual-power washing machine.
For most models and specifications, customers cannot calibrate the washing and drying time. When the drum washing machine is running, it will lock the machine to prevent theft. Once the washing machine is running, users will find it inconvenient to lift clothes, because they have to wait for the drum to stop rotating or even empty the pipeline. Some models and specifications prohibit users from adding clothes after the washing machine is running.
The motor of most drum washing machines needs to use a transmission belt to transmit the driving force of rotation to the drum. After long-term use, the transmission belt is easy to wear. In recent years, some models and specifications use direct drive variable frequency motor to push the drum at the same time, and do not use the transmission belt, which is said to be more leisurely and durable. Need to use low-foaming laundry detergent. Otherwise, the foam may overflow.