I. Introduction industrial washing machine is used in hotels, Hotel Laundry or cleaning plant used large quantities of clothing and washing machine, with washing capacity, Effect, Low cost High efficiency And less pollution. The washing process generally washed Rinse, Uniform drainage and dehydration of several parts. Control of the entire washing key to a very smooth low speed when washing, and dehydration when the torque has a high rotation speed. Industrial washing machines drive system is a complex washing and dehydration in the motor speed varied widely, usually more than one clutch cage motor is running or use the variable level switch with clutch motor, pulleys and other mechanical devices to achieve Reversible switching speed regulation. And because a large workload, in orderBD; mso-hansi-font-family: Times New Roman ; mso-ascii-font-family: Times New Roman "> below. Washing, Clear drift of the rotational speed of 40 r / min, uniform drainage speed 70 r / min, 2 times the speed of dehydration were 400 r / min and 500 r / min, dry speed 30 r / min, corresponding to sections washing time was t 1 = 5 min, t 2 = 1 min, t 3 = 2 min, t 4 = 3min, t 5 = 1 min, t 6 = 4 min, t 7 = 5 min; In addition, the converter also set up two slopes rise / fall time, 1 for the wash cycle, one for dehydration cycle. As can be seen from the diagram, the motor running in the course of constantly changing shift, and a wide speed range, this converter is fully capable of competent work. Third, the control system introduced 8A The Power current characteristics and control requirements, choose Panasonic BFV70374FP converter, the main technical regulations 2. 1.2 ??? PLC Selection SI MATI C S72 200 series
Siemens launched a small PLC. Its compact structure, Good scalability, Low cost, by the user favorite. CPU use CPU224, 6ES72142 1BD222 0XB0, the digital input / output points 24 points for the realization of washing machine start and stop control, and multi-rate options; expansion module use an analog input interface, to collect clothing and fabrics, Times New Roman ; mso-ascii-font-family: Times New Roman "> water temperature Weight, Turbidity to determine the operating mode of washing machines. (2) speed control system and control the flow chart: specific control flow is as follows: initially select the method of washing the Control Panel, and issued orders start; then distributed in the laundry drum in the vicinity of the various sensors to detect the cloth, Amount of cloth and other signals into the PLC, PLC based information through fuzzy decision-making, the operation mode for washing machine, washing each stage to determine the order of operations, Washing time; PLC and through the switch output signal to the inverter to issue commands to control the motor s rotating, New Roman "> start-stop, Multi-level rate options Multi-level addition and subtraction rate selection. When the motor overload is detected, the fault alarm signal back to the PLC, control indicator alarm or control of motor stop. Among them, the cloth quantity detection based motor “ switch ” , “ stop ” Inertial speed of the pulse when the number of measurement. Put some clothes in the wash bucket and water, and then drive motor to “ Open ” 0. 3 s, “ Stop ” 0. 7 s repeated operation of the law, during the motor in “ oman "> frequency selection, low speed operation should have a torque increase. Table 2, the main parameter for the inverter. IV Notes Converter significantly increased the use of the performance of industrial washing machine, but as a high-power power electronics products, but also work in the community laundry room, in use there are some considerations. Washing clothes at low speed when the drum contains a lot of water as a result, a great load. Therefore, the need to enhance the compensation set by torque converter to output a large torque at low speed motor. In the high-speed dehydration condition, the clothing is easy to form uneven distribution of the drum, at very high speeds will produce work of great eccentricity excitation, causing severe vibration of the whole structure. Therefore, oman ">, the operation mode determination process, should arrange for a uniform water conditions, so that the discharge while maintaining the clothing distribution. In addition, the frequency converter to be installed and make regular inspections to prevent vibration lead to loosening. Frequency installed in high humidity, laundry room, insulation and corrosion often occur. Therefore, the laundry room should be dry to maintain a certain degree and good ventilation to prevent water vapor into the cause electrical short circuit within the inverter. industrial washing machines are used for hotels , Community laundry room, pay attention to noise issues, to prevent impact on nearby residents; must also consider the inverter interference to other electrical equipment. Should be added in the converter into an electric line side reactors. V. Conclusion s New Roman "> variable frequency control is automatic control of industrial washing machines are a good choice. using PLC and frequency converter speed control system can meet the standards of cleaning and high-speed dehydration and other conditions of the request, and can improve the quality of washing; inverter reduces the use of transmission, increasing the system s operational life, reduced mechanical and electrical noise, also optimizes the washing speed and reduces power loss. At present, Zhendui industrial washing machine Teyou the Fuzaitexing Ershe Ji s washing machines have special inverter stages of development. With the texture of clothing Upgrading and diversification, conversion of industrial washing machines will continue to move forward the continuous development.