JPH0367948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for driving a pair of Nelson rollers, and more specifically, the present invention relates to a method for driving a pair of Nelson rollers, and more specifically, the present invention relates to a method for driving a pair of Nelson rollers.
The present invention relates to a method in which a Nelson roller used for stretching and processing a linear object such as a wire can be driven with less energy and the capacity of the driving power source can be reduced.

Conventionally, as a driving method for the Nelson roller, in order to produce a large quantity of the same product, such as in a drawing device for synthetic fibers, a device in which multiple spinning and drawing take-up weights are installed in parallel has been used, and the number of such spindles is 20 or more. It is often more than a weight. Each weight is provided with a Nelson roller. The rotation speed of the Nelson roller varies depending on the stretching conditions, but it is rotated at a surface speed of 1.500 m/min or more, and in the case of high speed, 3000 m/min or more. The rollers are driven in the manner shown in FIG. 1 (block diagram showing the drive system of the linear material transfer roller).

That is, the yarn Y spun in the spinning section 1 is stretched in the stretching section 2 and wound up in the winding section 3.

Supply rollers R1, R1' provided in the stretching section 2,
R2, R2'...RN, RN' are respectively supply roller directly connected synchronous motors M1, M1', M2, M2',...
MN, MN', and supply roller directly connected synchronous motors M1, M1', M2, M2'...MN,
MN' is started and stopped using the motor control panel 4. Further, as a power source for driving the electric motor, a supply roller voltage type inverter 5 is used which allows setting of individual supply roller speed conditions.

On the other hand, the stretching roller D1 provided in the stretching section 2,
D1', D2, D2'...DN, DN' are respectively drawing roller directly connected synchronous motors P1, P1', P2, P2'...
Rotates in conjunction with PN and PN'. Stretching roller direct-coupled synchronous motor P1, P1', P2, P2',...PN,
PN' is started and stopped using the motor control panel 4. Further, as a power source for driving the electric motor, a voltage-type inverter 6 for the stretching roller is used, which allows setting of speed conditions for each stretching roller.

Recently, due to improvements in production efficiency in the manufacturing process of synthetic fibers, the speed has increased from 3000m/min to 6000m/min, and multi-filament drawing of 2 to 4 threads on one roller is performed, followed by splitting and winding. Methods such as ``take-up'' came to be adopted. In this case, 1
As the number of processed fibers on the drawing rollers increases,
The number of rollers installed can be reduced accordingly, and the equipment itself can be made economically. However, in the conventional method of driving rollers, the capacity of each synchronous motor increases, and the power supply becomes larger as a result. There is a drawback.

The installed capacity of a voltage type inverter as a drive source for a synchronous motor is determined by the load of the motor that is already in operation and the starting load of the motor that is about to be started.

For example, in the conventional method described above, when processing a synthetic fiber drawing machine with 20 spindles with one thread attached to each spindle (total of 20 threads), the load already in operation is 1.0KW x 1/0.6 x 1 /0.85 × 19 (Motor capacity) (Power factor) (Efficiency) (Number of spindles) The load required to start one spindle is 1.0KW × 1/0.6 × 1/0.85 (Motor capacity) (Power factor) (Efficiency) × 20 times (increase rate due to activation), resulting in a total of 76.5KVA.

On the other hand, in the conventional method described above, when processing is performed using a synthetic fiber drawing device with 5 spindles with 4 threads set on each spindle (total of 20 threads), (the motor capacity is 4 times as large as the 4 threads,
The number of rollers will be 1/4. ) The load already in operation is 4.0KW x 1/0.6 x 1/0.85 x 4 (motor capacity) (power factor) (efficiency) (number of spindles) The load required to start one spindle is 4.0KW x 1/ 0.6 × 1/0.85 (motor capacity) (power factor) (efficiency) × 20 times (increase rate due to startup), resulting in a total of 188.3KVA.

Therefore, when multiple threads are attached to a roller and the threads are processed, the power capacity increases.
This would be extremely uneconomical.

Further, even when the speed is extremely increased, it is necessary to bring the rollers to the specified rotation speed in a short period of time, which increases the power supply capacity and becomes extremely uneconomical.

That is, in the case of the conventional device, the number of power supplies for driving the electric motor increases due to the increase in the number of threads or the increase in speed. This is due to the increase in starting load as the capacity of each motor increases (the starting load for a synchronous motor is about 20 times the normal load). this is,
It is a necessary condition that the power supply device commonly provided to each weight maintains the voltage and frequency of the operating conditions, and the motor to be started has no choice but to start directly.

In order to reduce the starting load, we tried a method of setting the power supply to a low frequency, performing a slow startup, and then temporarily increasing the frequency of the power supply, but in the case of a synchronous motor, the starting load is low even during low-speed startup. cannot be expected to reduce significantly.

Therefore, in order to eliminate the drawbacks of the prior art described above, an induction motor with a high power factor and high efficiency was adopted. However, when driving a pair of Nelson rollers using an induction motor, it is necessary to make the rotational speed of each roller, that is, the circumferential speed, the same speed, and the rotational speed of the electric motor directly connected to each roller must be the same. I took care to make sure that In this case, it is necessary to detect the speed of each electric motor directly connected to each roller and perform feedback control to each power supply device based on the obtained detected speed value. Furthermore, in the case of induction motors, speed errors occur due to slippage, so it is necessary to correct this error, which requires extremely sophisticated control, and requires installation of two lines of power supply and control equipment, which increases equipment costs. has become extremely large.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art and improved techniques described above, and to provide a method for driving a linear object transfer roll that has a high power factor and high efficiency, and does not require complicated equipment.

The present invention provides a method for driving a transfer roller that continuously transfers a linear object wound around a pair of Nelson rollers A and A', in which each electric motor for rotating the Nelson rollers A and A' is an induction motor. electric motor 7,
7' is commonly used by connecting to one drive power source,
The electric motor 7' that drives one roller A' is not controlled, and the speed of only the electric motor 7 that drives the other roller A is detected and the detected value is fed back to control the speed. This is a method of driving a linear object transport roller.

FIG. 2 is a block diagram of the method of the invention;
A and A' are a pair of Nelson rollers, roller A is directly connected to the induction motor 7, and roller A' is directly connected to the induction motor 7'. 8 is a speed detector, and roller A
The rotation speed of the induction motor 7' directly connected to the motor is detected. This speed detection may be performed by detecting the speed of the induction motor 7. The induction motors 7 and 7' share a common power supply, and one of the induction motors 7 or 7' is uncontrolled and connected to one PWM type transistor inverter 9. 10 is an acceleration/deceleration setting controller, and 11 is a speed setting device. A speed detection circuit 12 is connected to the speed detector 8 on one side and to the slip correction control circuit 14 on the other side.

In the case of the induction motors 7, 7', a slip correction circuit 13 is provided since speed errors occur due to slip. One side of the slip correction circuit 13 is connected between the acceleration/deceleration setting controller 10 and the PWM type transistor inverter 9, and the other side is connected to the slip correction control circuit 14 like the speed detection circuit 12.

That is, each of the conventional induction motors 7 and 7' has
The speed detector 8, PWM type transistor inverter 9, acceleration/deceleration setting controller 10, speed setting device 1
1. All of the speed detection circuit 12, slip correction circuit 13, and slip correction control circuit 14 are provided, but in the present invention, the induction motors 7 and 7' have a common power supply device, which is a PWM type transistor inverter 9. Therefore, the number of these facilities can be reduced to 1/2.

In this case, there is a concern about the slip error between the induction motors 7 and 7', but when no filament is installed on rollers A and A', an error of about 0.1% is observed; When the rollers A and A' are set on rollers A and A' and continuously conveyed, it completely disappears. This is because the uncontrolled induction motor has a load torque, that is, the linear object is two Nelson rollers A,
This is because rollers A and A' move at the same speed due to the tension generated by winding the rollers around A' several times and pulling them.

According to the method of the present invention, as described above, the Nelson rollers A and A' are driven by one power supply device, and furthermore, by winding a linear object around the Nelson rollers A and A' and making them run. , based on the fact that the rollers A and A' can have the same speed, even if the rollers A and A' are connected to one power supply device, the speed error of each roller A and A' is eliminated, and the power supply device and the power supply The equipment associated with the equipment, such as the speed detection circuit, slip correction circuit, speed detector, speed setting device, acceleration/deceleration setting controller, etc., can be halved, significantly reducing equipment costs, and using a PWM method as a power supply. By using a transistor inverter and sharing the converter section of the inverter with the rollers forming the other nelsons, the regenerated power generated during braking can be used for other purposes, and power consumption can be significantly reduced.

For example, when the method of the present invention is applied to a synthetic fiber drawing device, each weight becomes a driving device, that is, a power supply device, so it can start, stop, brake, speed up, etc. independently of other weights, and the yarn When threading, the speed is low (e.g. 1000m/min) for workability, and after threading is finished, the speed is set at high speed (e.g. 5000-10000m/min).
The speed of each roll within the weight can be relatively slowed down or fast, such as by setting the speed to

Using the method of the present invention, for example, when processing with a synthetic fiber drawing machine with 5 spindles with 4 threads set on each spindle (20 threads in total), the load is 4.0KW x 1/0.85 x 1/0.9 (motor Capacity) (power factor) x 5set (weight), which is approximately 26.1KVA.

Therefore, the power supply capacity can be significantly reduced (1/3 to 1/7) compared to the conventional one, and the equipment cost can be significantly reduced (30% or more).

The method of the present invention can also be effectively applied to rollers for transporting linear objects such as electric wires and steel cords.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a drive system of a conventional linear object transfer roller. FIG. 2 is a block diagram showing a drive system for a linear material transfer roller according to the method of the present invention. DESCRIPTION OF SYMBOLS 1... Spinning section or yarn feeding section, 2... Drawing section, 3... Winding section, 4... Motor control panel, 5... Voltage type inverter for supply roller, 6... Voltage type inverter for drawing roller, 7, 7'... Induction Electric motor, 8...Speed detector, 9
...PWM type transistor inverter, 10... acceleration/deceleration setting controller, 11... speed setting device, 12... speed detection circuit, 13... slip correction circuit, 14... slip correction control circuit.

Claims (1)

[Scope of Claims] 1. In a transfer roller driving method for continuously transferring a linear object wound around a pair of nelson rollers A, A', each electric motor 7, 7 rotates the nelson rollers A, A'. ' is an induction motor, and the motors 7,
7' is commonly used by connecting to one drive power source,
The electric motor 7' that drives one roller A' is not controlled, and the speed of only the electric motor 7 that drives the other roller A is detected and the detected value is fed back to control the speed. A method of driving a linear material transfer roller. 2. A method for driving a linear material transfer roller according to claim 1, characterized in that the linear material is a synthetic fiber. 3. The method of driving a linear object transport roller according to claim 2, characterized in that a pair of Nelson rollers is used in the step of drawing synthetic fibers.