Application of the hottest inverter in Foshan chaz

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Application of frequency converter in Foshan chazhen printing and dyeing Clothing Co., Ltd.

in the knitting fabric production process equipment, the three systems of heating and gas supply, bleaching and dyeing, and finishing are all important fields of applying frequency conversion and speed regulation technology

1. Application in heating and gas supply system

knitted fabrics cannot be separated from heat and compressed air in dyeing and finishing processes. Heat energy mainly includes steam heat energy and heat energy with heat transfer oil as the medium. Steam heat energy supplies printing and dyeing process equipment, such as high-temperature and high-pressure dyeing machine, room temperature dyeing machine, VAT, etc. of bleaching and dyeing process. Heat energy with heat conducting oil as medium is supplied to drying equipment, such as printing machine, dryer, resin setting machine and other equipment for post-treatment process

under the condition of high oil price, most steam heating boilers use coal-fired boilers. In the past, the air volume of induced draft fan and blower in coal-fired boiler was adjusted by damper. After adopting frequency conversion speed regulation technology, the purpose of adjusting the air volume of fan can be achieved by adjusting the speed of motor. Similarly, for the boiler feed pump, the frequency converter is used to adjust the flow of the feed pump to achieve constant water level and continuous water supply. Taking the 15 ton coal-fired chain boiler as an example, the induced draft fan is 90kw, and the frequency converter operates at about 40Hz; The blower is 45KW, and the frequency converter operates at about Hz; The feed water pump is 30kW, and the operating frequency of the frequency converter is about 40Hz. The gas supply pressure of the boiler can be stabilized at about 1MPa. In this way, the required 0 7MPa steam heat energy, day 5, can be used as an experimental project to dye t knitted fabric production needs

for coal-fired boilers (also known as organic heat carrier boilers) that use heat transfer oil as the medium for heating, frequency conversion speed regulation technology is adopted for the heat transfer oil circulating pump, and the oil supply pressure of heat transfer oil is adjusted by adjusting the speed of the circulating pump. Similarly, the induced draft fan can also be equipped with a frequency converter to control the air volume and control the heating temperature of the heat transfer oil within the set range. Taking the 4million kcal organic heat carrier furnace as an example, the motor power of the circulating pump is 75kW, and the operating frequency of the frequency converter is 40 ~ 50Hz; The power of induced draft fan is 30kW, and the operating frequency is about 30Hz; The blower power is 15kw, and the operating frequency is 45 ~ 50Hz: the working temperature of the heat transfer oil is 250 ℃ - 260 ℃, and the working pressure is 0.4MPa, which can supply the heat energy required by 4 ~ 5 resin setting machines or printing machines and dryers

loom, dyeing machine and setting machine all require compressed air with a certain pressure to drive the cylinder or valve to work. Usually, centralized gas supply is adopted. According to the production needs and the amount of gas consumption, one or two compressors are opened. In the past, when one compressor was not enough to use gas, and two compressors were used for many times, a considerable part of the compressed air had to be discharged through the safety valve, which was a great waste. After adopting frequency conversion speed regulation technology, using the P1D function built in the frequency converter and installing a pressure transmitter at the main air supply port can solve this problem well. When the air pressure is enough, the frequency converter automatically reduces the frequency to drive the motor to operate. Once the air supply is insufficient and lower than the set pressure, the frequency converter automatically increases the frequency to drive the motor to operate, so as to ensure that the air supply pressure remains unchanged.

2. The application of

dyeing process in the bleaching and dyeing system is the key process for customers to have high requirements for the quality of knitted fabric products, and the damage of its product quality is directly related to the reputation of the enterprise. The degree of automation of dyeing machine has a great relationship with the control of product quality. In the 1980s, the dyeing machine used a simple temperature controller to control the temperature of the dye liquor, the pressure of the dye liquor nozzle was adjusted by a manual valve, and the speed of the cloth guide rod was adjusted by a slip speed regulating motor or a mechanical rewarming speed regulator without international market. This control method is not energy-saving, the mechanical wear is serious, and the general fixture can not meet the requirements, and the product quality is unstable. A few days ago, domestic dyeing machines, especially high-temperature and high-pressure dyeing machines, adopt PLC (PC) programmable control, configure frequency converters, and use programmable controllers to control the temperature rise, temperature drop and heat preservation of the dye solution at the set rate. It can also control the rotation speed of the cloth guide rod and the circulating pump at a fixed time and speed

for example, an amsa632 high temperature and high pressure dyeing machine, using PLC programmable controller and using the multi-stage speed input terminals (x1-x4) built in the frequency converter, can automatically set the operating frequency of the circulating pump and cloth guide rod motor of the dyeing machine to run on different frequency bands, such as 20Hz for heating up during feeding, 30Hz for heat preservation, 35Hz for cooling down, 50Hz for overflow washing, etc. It can achieve a good control effect on eliminating quality problems such as color streaks and color differences in the process

3. Application in finishing system

finishing is the last process of knitted fabric, which has strict requirements on process quality and requires a high degree of automation control means. The finishing process equipment includes opener, resin setting machine and other equipment. Generally, the length of the setting machine is 40m, and the working temperature of the oven is about 200 ℃. In addition to the printing machine, the control technology is more complex equipment. In the past, some of these devices used DC motors to control the main drive, and the code reduction device operated synchronously; Use a two speed or three speed motor to control the circulating fan of the oven; The effect is not ideal. At present, most of the qualitative machines made in foreign countries and Taiwan use digital synchronous controller with frequency conversion to control the asynchronous motor for synchronous operation, so that the knitted fabric can pass through the oven dozens of meters long at a uniform speed on the shaping machine, which can basically meet the requirements for controlling the weight, thickness uniformity, streaking, color difference and other quality problems of the cloth. For example, the Taiwan made Huangji shaping machine uses a speed controller to control more than 6 frequency converters at the same time to drive the circulating fan to operate, and the operating frequency of the motor can be reduced within the range of 30 ~ 60Hz. Dsc-316d digital synchronous controller with frequency converter can simultaneously control the main drive, code reduction device, cloth lifting, manipulation and other asynchronous motors for synchronous operation

this dsc-316d synchronous controller has the system function of integrating various analog signals for digital processing. It can be used as a single machine at a fixed speed, or as a series parallel connection of multiple machines. The device adopts the closed-loop control mode, and takes the encoder (PG) on the motor as the speed feedback signal; In this way, the speed error caused by the change of temperature and other external factors can be solved, and the control accuracy of the synchronous system can be improved. Therefore, this kind of synchronous control is one of the models with the highest degree of automation of the knitting fabric setting machine using frequency conversion speed regulation technology at present

4. Application effect

the unit of the author was originally a low force application system, with equipment powered by two 500KVA and one 240kVA transformer, and the load rate reached about 70%. Since many motors above 30kW are used, especially the induced draft fan in the boiler room, with a power of 90kw, the switch in the power supply room often trips when it is started at power frequency; In addition, when the power frequency is started, the machinery and electrical devices of the equipment have large instantaneous impact, serious wear and tear, many faults, high maintenance rate, and high labor intensity of workers; It has a great impact on the product quality and output of the enterprise

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