In the production process equipment of knitted fabrics, the three systems of heating, gas supply, bleaching and dyeing, and finishing are important fields for applying variable frequency speed control technology.
1. Application on heating and gas supply system
Knitted fabrics are inseparable from thermal energy and compressed air in the printing and finishing process. The thermal energy mainly includes two kinds of heat energy: steam heat energy and heat transfer oil as medium. Steam heat supply printing and dyeing process equipment such as high temperature and high pressure dyeing machine for bleaching and dyeing process, room temperature dyeing machine, pulling cylinder and so on. The heat transfer oil is used as the medium for the heat supply drying equipment, such as the printing machine, the dryer, the resin setting machine and the like of the finishing process.
Steam heating boilers use coal-fired boilers at higher fuel prices. The induced draft fan and blower in the coal-fired boiler have been adjusted by the damper in the past. After adopting the frequency conversion speed regulation technology, the fan speed can be adjusted by adjusting the speed of the motor. Similarly, for the feed water pump of the boiler, the frequency converter is used to adjust the flow rate of the feed water pump to reach the constant water level for continuous water supply. Take 15 tons of coal-fired chain boiler as an example, the induced draft fan is 90KW, the running frequency of the inverter is about 40Hz; the blower is 45KW, the running frequency of the inverter is about 45-55Hz; the feed pump is 30KW, and the running frequency of the inverter is about 40Hz. The supply pressure of the boiler can be stabilized at around 1 MPa. This will ensure the steam heat energy of 0.5-0.7Mpa pressure required by the dyeing machine, and the need for daily dyeing of 40-50t knitted fabric.
The coal-fired boiler (also called organic heat carrier furnace) which uses heat-conducting oil as medium for heating, adopts frequency conversion speed regulation technology for the heat-conducting oil circulation pump, and adjusts the oil supply pressure of the heat-conducting oil by adjusting the rotation speed of the circulating pump. Similarly, the drum fan can also be equipped with an inverter to control the air volume and control the heating temperature of the heat transfer oil within the set range. Take the 4 million kcal organic heat carrier furnace as an example, the circulating pump motor power is 75kW, the inverter running frequency is 40~50Hz; the induced draft fan power is 30kW, the running frequency is about 30Hz; the blower power is 15kW, the running frequency is 45~50Hz: the heat transfer oil working temperature 250 ° C -260 ° C, working pressure 0.4MPa, can supply 4 ~ 5 resin setting machine or printing machine, the heat required by the dryer.
Weaving machines, dyeing machines, and setting machines all require compressed air with a certain pressure to push the cylinder or valve to work. Usually, the method of centralized gas supply is adopted. According to the production needs, the amount of gas used is open-set or two compressors. In the past, the compressors were not used enough. When two units were opened, there was a lot of compressed air. Some of them were discharged through the safety valve, which was a waste. After adopting the frequency conversion speed regulation technology, the P1D function built in the inverter is used to install the pressure transmitter on the total air supply port, which can solve this problem well. When the air pressure is sufficient, the inverter automatically reduces the frequency to drive the motor. Once the air supply is insufficient, it is lower than the set pressure. The inverter automatically raises the frequency to drive the motor to run, thus ensuring that the air supply pressure does not change. The principle is shown in Figure 1. Domestic Jialing inverter as an example).
2. Application on bleaching and dyeing system
The dyeing process is a key process for customers to have high quality requirements for knitted fabrics. The quality of their products is directly related to the reputation of the company. The degree of automation of the dyeing machine has a great bearing on the quality of the control products. In the dyeing machine of the 1980s, the temperature of the dyeing liquid was controlled by a simple thermostat, the pressure of the dyeing nozzle was adjusted by a manual valve, and the speed of the cloth stick was adjusted by a slip motor or a mechanical stepless speed. The device is idling, this control method does not save energy, the mechanical wear is serious, and the product quality is unstable. Recently, the domestic dyeing machine, especially the high temperature and high pressure dyeing machine, uses PLC (PC) programmable control to configure the frequency converter, and uses the programmable controller to control the dyeing liquid to heat up, cool down and keep warm at the set rate. It is also possible to realize the timing, constant speed control and control principle block diagram of the speed of the guide cloth stick and the circulating pump.
Such as an AMSA632 high temperature and high pressure dyeing machine, using PLC programmable controller, and then using the multi-speed input terminal (X1—X4) built in the inverter, the operating frequency of the circulating pump and the guide roller motor of the dyeing machine can be automatically set. 20Hz temperature rise during feeding, 30Hz when holding temperature, 35Hz when cooling, 50Hz when overflowing, etc., running in different frequency bands. It can achieve good control effect on the quality problems such as eliminating color and color difference in the process.
1. Application on heating and gas supply system
Knitted fabrics are inseparable from thermal energy and compressed air in the printing and finishing process. The thermal energy mainly includes two kinds of heat energy: steam heat energy and heat transfer oil as medium. Steam heat supply printing and dyeing process equipment such as high temperature and high pressure dyeing machine for bleaching and dyeing process, room temperature dyeing machine, pulling cylinder and so on. The heat transfer oil is used as the medium for the heat supply drying equipment, such as the printing machine, the dryer, the resin setting machine and the like of the finishing process.
Steam heating boilers use coal-fired boilers at higher fuel prices. The induced draft fan and blower in the coal-fired boiler have been adjusted by the damper in the past. After adopting the frequency conversion speed regulation technology, the fan speed can be adjusted by adjusting the speed of the motor. Similarly, for the feed water pump of the boiler, the frequency converter is used to adjust the flow rate of the feed water pump to reach the constant water level for continuous water supply. Take 15 tons of coal-fired chain boiler as an example, the induced draft fan is 90KW, the running frequency of the inverter is about 40Hz; the blower is 45KW, the running frequency of the inverter is about 45-55Hz; the feed pump is 30KW, and the running frequency of the inverter is about 40Hz. The supply pressure of the boiler can be stabilized at around 1 MPa. This will ensure the steam heat energy of 0.5-0.7Mpa pressure required by the dyeing machine, and the need for daily dyeing of 40-50t knitted fabric.
The coal-fired boiler (also called organic heat carrier furnace) which uses heat-conducting oil as medium for heating, adopts frequency conversion speed regulation technology for the heat-conducting oil circulation pump, and adjusts the oil supply pressure of the heat-conducting oil by adjusting the rotation speed of the circulating pump. Similarly, the drum fan can also be equipped with an inverter to control the air volume and control the heating temperature of the heat transfer oil within the set range. Take the 4 million kcal organic heat carrier furnace as an example, the circulating pump motor power is 75kW, the inverter running frequency is 40~50Hz; the induced draft fan power is 30kW, the running frequency is about 30Hz; the blower power is 15kW, the running frequency is 45~50Hz: the heat transfer oil working temperature 250 ° C -260 ° C, working pressure 0.4MPa, can supply 4 ~ 5 resin setting machine or printing machine, the heat required by the dryer.
Weaving machines, dyeing machines, and setting machines all require compressed air with a certain pressure to push the cylinder or valve to work. Usually, the method of centralized gas supply is adopted. According to the production needs, the amount of gas used is open-set or two compressors. In the past, the compressors were not used enough. When two units were opened, there was a lot of compressed air. Some of them were discharged through the safety valve, which was a waste. After adopting the frequency conversion speed regulation technology, the P1D function built in the inverter is used to install the pressure transmitter on the total air supply port, which can solve this problem well. When the air pressure is sufficient, the inverter automatically reduces the frequency to drive the motor. Once the air supply is insufficient, it is lower than the set pressure. The inverter automatically raises the frequency to drive the motor to run, thus ensuring that the air supply pressure does not change. The principle is shown in Figure 1. Domestic Jialing inverter as an example).
2. Application on bleaching and dyeing system
The dyeing process is a key process for customers to have high quality requirements for knitted fabrics. The quality of their products is directly related to the reputation of the company. The degree of automation of the dyeing machine has a great bearing on the quality of the control products. In the dyeing machine of the 1980s, the temperature of the dyeing liquid was controlled by a simple thermostat, the pressure of the dyeing nozzle was adjusted by a manual valve, and the speed of the cloth stick was adjusted by a slip motor or a mechanical stepless speed. The device is idling, this control method does not save energy, the mechanical wear is serious, and the product quality is unstable. Recently, the domestic dyeing machine, especially the high temperature and high pressure dyeing machine, uses PLC (PC) programmable control to configure the frequency converter, and uses the programmable controller to control the dyeing liquid to heat up, cool down and keep warm at the set rate. It is also possible to realize the timing, constant speed control and control principle block diagram of the speed of the guide cloth stick and the circulating pump.
Such as an AMSA632 high temperature and high pressure dyeing machine, using PLC programmable controller, and then using the multi-speed input terminal (X1—X4) built in the inverter, the operating frequency of the circulating pump and the guide roller motor of the dyeing machine can be automatically set. 20Hz temperature rise during feeding, 30Hz when holding temperature, 35Hz when cooling, 50Hz when overflowing, etc., running in different frequency bands. It can achieve good control effect on the quality problems such as eliminating color and color difference in the process.
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