The application of frequency conversion speed regulation technology in the textile industry is very broad, and we can almost see its application in various spinning machines. The application of frequency conversion technology on textile equipment can not only improve production efficiency, improve automation level, reduce the intensity of workers’ work, but also improve automatic energy-saving operation, increase power-saving rate, and provide continuous operation in case of instantaneous power failure, and acceleration and deceleration of conveyor belt speed at the same time. function. The following is an example of the application of textile machine frequency converter (hereinafter referred to as VFD) in the textile industry.

Roving frame

Because the bobbin winding part of the roving frame and the speed of the front roller are prone to errors when starting and stopping, this will cause the roving tension to be too large or too small, which will easily lead to the formation of coarse details of the roving. In order to reduce the occurrence of coarse details , When designing the transmission of the roving frame, a reactor, a time relay, an electromagnetic clutch, and other anti-detail devices will be added.

The reactor here is mainly responsible for dealing with the three-phase unbalanced state of the motor when the roving frame is started, so as to reduce the starting torque of the motor and achieve the purpose of soft start. When the phase is separated, the bobbin stops winding, while the front roller continues to output the roving with inertia, and the roving between the roller and the flyer has a certain degree of slack to prevent excessive tension when the roving is driven again.

This kind of anti-detail device has serious defects in actual use. One is that the reactor is connected in series with one phase of the three-phase circuit, and the starting torque of the motor is reduced by using the three-phase unbalanced principle. When the roving frame is started, the reactor is short-circuited through the time relay to restore the motor to a three-phase balanced state. put into normal operation. If there is a problem with the time relay, the motor will be in three-phase unbalanced operation for a long time, causing the motor to overheat and burn out. The second is that the clutch time of the electromagnetic clutch used for parking is realized through the coordination of two time relays, which makes it difficult to grasp the slack degree of the roving, and the failure of the electromagnetic clutch is also relatively high; In actual production, it can be kept very little, and the problem of anti-detail of roving has not been well solved. At present, the new roving frame and the old machine transformation adopt AC frequency conversion technology. So that this technological problem can be solved. According to the test of the yarn quality before and after the transformation of the FA491 roving frame, the CV% of the roving in the start-up section is reduced by 2-3%, and the thickness of the roving is reduced by more than 90%.

FA491 high-speed suspension roving frame is a new type of roving frame developed in recent years. Industrial computer, PLC and VFD are used to control 4 sets of motors to rotate the flyer, roller, simple tube and dragon tendon to lift respectively. The cone wheel speed change device and forming device are removed, which simplifies the mechanism. High efficiency, high reliability, low noise, easy operation and maintenance. Good process adaptability, reducing broken ends. The highest speed can reach the standard 1500rpm, realizing new technologies such as man-machine dialogue, parking and automatic positioning. It is a high-level roving frame.

VFD in Textile Industry

Sizing machine

The sizing machine can reduce the application of some mechanical structures and motors through the application of frequency conversion speed regulation technology. In the transformation of old G142 series sizing machines, AC frequency conversion speed regulation is adopted, which reduces the first group of mechanical stepless transmissions in the original design, and saves a servo motor and a slow motor at the same time. In terms of satisfying the sizing process, the speed of the vehicle has been changed from slow speed, acceleration and deceleration of the main engine to an uninterrupted stepless speed regulation of the speed of the start-up process, which provides conditions for adjusting the pressure of the speed change and realizing the balance of the sizing rate of the sizing yarn.

GA308 sizing machine is AC distributed drive. Among them, the sizing tank, the lower sizing tank and the drying cylinder are driven by AC frequency conversion motors, while the weaving shaft and traction roller are independently driven by AC servo frequency conversion motors. A total of 5 VFDs, 2 servo controllers, and sensors for pressure, temperature, and moisture regain are used. Controlled by industrial computer and programmable logic controller PLC. constitute a distributed control system. Among them, PLC is used to control the action of the whole machine, the moisture regain, the temperature of the drying room and the pulp tank, and the pressure of the pressing roller. The whole machine is controlled by the industrial computer. This machine has high control precision, stable performance and low failure rate. It is a high-quality and high-level equipment.

Application in cotton textile equipment

In the spinning process, the electrical transmission of the processing equipment is required to be stable, and the jogging, starting, and speed up and down should be realized smoothly, so as to make the fiber draft uniform, reduce the weight unevenness and evenness CV value. In the transmission system of cotton spinning equipment, belts and gears are used. Due to the hardness of the motor, it is inevitable that belt slipping and gear impact will occur during jogging and starting. In the mechanical transmission wheel train, the more gears, the greater the probability of gear damage. The application of AC frequency conversion technology can solve the problem of smooth start, eliminate the impact force of mechanical start, realize stepless speed regulation, and meet the production process requirements to improve yarn quality. When this technology is applied to the change of the yarn count, there is no need to change the teeth or the pulley, and the change of the process speed of the equipment can be completed only by setting the frequency conversion.

The traditional old-fashioned carding machine is limited by age technology, manufacturing cost, market demand and other factors, so there are inevitably some defects. For example, the electromagnetic clutch in the drive system of the A186D carding machine has high faults, which often cause stoppages and fire alarms from time to time, causing certain losses to production efficiency and product quality. It takes a lot of manpower and material resources to maintain and maintain. Some enterprises fly wheel electromagnetic clutch is abandoned. In this way, thin strips are produced in the process of the slow speed of the doffer, and when it is serious, there will be broken edges, and the phenomenon that the cotton net is broken will affect the quality of the raw strips. In order to avoid this phenomenon, some enterprises use improper operation methods to make up for the above equipment defects, but it is also not advisable to cause a large number of scraps.

The process of improving the operating condition of a carding machine. In order to make the speed up and down of the doffer smooth, the A186D carding machine is designed with a two-speed motor, an inertia wheel, and an electromagnetic clutch in the mechanical transmission, and realizes it by means of electricity and machinery. In the design of A186E, A186F and FA201 carding machines, the control link of star-delta conversion of motor is added, so as to further improve the slope of rising and falling speed. FA201B and FA212 carding machines adopt AC frequency conversion speed regulation, so as to realize the arbitrary adjustment of the doffer speed-up slope and the arbitrary variable function of the doffer process speed. Provide a good example for the transformation of old machines.

The equipment transformation of A186D through AC frequency conversion speed regulation technology not only improves the performance of the equipment, but also reduces downtime due to failure. It also improves production efficiency and sliver quality.

The application of frequency conversion speed regulation technology in the textile industry is very broad, and we can almost see its application in various spinning machines. The application of frequency conversion technology on textile equipment can not only improve production efficiency, improve automation level, reduce the intensity of workers’ work, but also improve automatic energy-saving operation, increase power-saving rate, and provide continuous operation in case of instantaneous power failure, and acceleration and deceleration of conveyor belt speed at the same time. function. The following is an example of the application of textile machine frequency converter (hereinafter referred to as VFD) in the textile industry.

Roving frame

Because the bobbin winding part of the roving frame and the speed of the front roller are prone to errors when starting and stopping, this will cause the roving tension to be too large or too small, which will easily lead to the formation of coarse details of the roving. In order to reduce the occurrence of coarse details , When designing the transmission of the roving frame, a reactor, a time relay, an electromagnetic clutch, and other anti-detail devices will be added.

The reactor here is mainly responsible for dealing with the three-phase unbalanced state of the motor when the roving frame is started, so as to reduce the starting torque of the motor and achieve the purpose of soft start. When the phase is separated, the bobbin stops winding, while the front roller continues to output the roving with inertia, and the roving between the roller and the flyer has a certain degree of slack to prevent excessive tension when the roving is driven again.

This kind of anti-detail device has serious defects in actual use. One is that the reactor is connected in series with one phase of the three-phase circuit, and the starting torque of the motor is reduced by using the three-phase unbalanced principle. When the roving frame is started, the reactor is short-circuited through the time relay to restore the motor to a three-phase balanced state. put into normal operation. If there is a problem with the time relay, the motor will be in three-phase unbalanced operation for a long time, causing the motor to overheat and burn out. The second is that the clutch time of the electromagnetic clutch used for parking is realized through the coordination of two time relays, which makes it difficult to grasp the slack degree of the roving, and the failure of the electromagnetic clutch is also relatively high; In actual production, it can be kept very little, and the problem of anti-detail of roving has not been well solved. At present, the new roving frame and the old machine transformation adopt AC frequency conversion technology. So that this technological problem can be solved. According to the test of the yarn quality before and after the transformation of the FA491 roving frame, the CV% of the roving in the start-up section is reduced by 2-3%, and the thickness of the roving is reduced by more than 90%.

FA491 high-speed suspension roving frame is a new type of roving frame developed in recent years. Industrial computer, PLC and VFD are used to control 4 sets of motors to rotate the flyer, roller, simple tube and dragon tendon to lift respectively. The cone wheel speed change device and forming device are removed, which simplifies the mechanism. High efficiency, high reliability, low noise, easy operation and maintenance. Good process adaptability, reducing broken ends. The highest speed can reach the standard 1500rpm, realizing new technologies such as man-machine dialogue, parking and automatic positioning. It is a high-level roving frame.

VFD in Textile Industry

Sizing machine

The sizing machine can reduce the application of some mechanical structures and motors through the application of frequency conversion speed regulation technology. In the transformation of old G142 series sizing machines, AC frequency conversion speed regulation is adopted, which reduces the first group of mechanical stepless transmissions in the original design, and saves a servo motor and a slow motor at the same time. In terms of satisfying the sizing process, the speed of the vehicle has been changed from slow speed, acceleration and deceleration of the main engine to an uninterrupted stepless speed regulation of the speed of the start-up process, which provides conditions for adjusting the pressure of the speed change and realizing the balance of the sizing rate of the sizing yarn.

GA308 sizing machine is AC distributed drive. Among them, the sizing tank, the lower sizing tank and the drying cylinder are driven by AC frequency conversion motors, while the weaving shaft and traction roller are independently driven by AC servo frequency conversion motors. A total of 5 VFDs, 2 servo controllers, and sensors for pressure, temperature, and moisture regain are used. Controlled by industrial computer and programmable logic controller PLC. constitute a distributed control system. Among them, PLC is used to control the action of the whole machine, the moisture regain, the temperature of the drying room and the pulp tank, and the pressure of the pressing roller. The whole machine is controlled by the industrial computer. This machine has high control precision, stable performance and low failure rate. It is a high-quality and high-level equipment.

Application in cotton textile equipment

In the spinning process, the electrical transmission of the processing equipment is required to be stable, and the jogging, starting, and speed up and down should be realized smoothly, so as to make the fiber draft uniform, reduce the weight unevenness and evenness CV value. In the transmission system of cotton spinning equipment, belts and gears are used. Due to the hardness of the motor, it is inevitable that belt slipping and gear impact will occur during jogging and starting. In the mechanical transmission wheel train, the more gears, the greater the probability of gear damage. The application of AC frequency conversion technology can solve the problem of smooth start, eliminate the impact force of mechanical start, realize stepless speed regulation, and meet the production process requirements to improve yarn quality. When this technology is applied to the change of the yarn count, there is no need to change the teeth or the pulley, and the change of the process speed of the equipment can be completed only by setting the frequency conversion.

The traditional old-fashioned carding machine is limited by age technology, manufacturing cost, market demand and other factors, so there are inevitably some defects. For example, the electromagnetic clutch in the drive system of the A186D carding machine has high faults, which often cause stoppages and fire alarms from time to time, causing certain losses to production efficiency and product quality. It takes a lot of manpower and material resources to maintain and maintain. Some enterprises fly wheel electromagnetic clutch is abandoned. In this way, thin strips are produced in the process of the slow speed of the doffer, and when it is serious, there will be broken edges, and the phenomenon that the cotton net is broken will affect the quality of the raw strips. In order to avoid this phenomenon, some enterprises use improper operation methods to make up for the above equipment defects, but it is also not advisable to cause a large number of scraps.

The process of improving the operating condition of a carding machine. In order to make the speed up and down of the doffer smooth, the A186D carding machine is designed with a two-speed motor, an inertia wheel, and an electromagnetic clutch in the mechanical transmission, and realizes it by means of electricity and machinery. In the design of A186E, A186F and FA201 carding machines, the control link of star-delta conversion of motor is added, so as to further improve the slope of rising and falling speed. FA201B and FA212 carding machines adopt AC frequency conversion speed regulation, so as to realize the arbitrary adjustment of the doffer speed-up slope and the arbitrary variable function of the doffer process speed. Provide a good example for the transformation of old machines.

The equipment transformation of A186D through AC frequency conversion speed regulation technology not only improves the performance of the equipment, but also reduces downtime due to failure. It also improves production efficiency and sliver quality.

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