JPH0388679A - Rewinding speed control method for fiber thread streak rewinding machine - Google Patents

Abstract

PURPOSE:To accurately further surely focus-control the actual speed to the preset speed with good efficiency in a short time by performing a slight change control, when a difference between the preset speed and the detected speed is within a fixed range, and a large change control when the difference exceeds a fixed value. CONSTITUTION:When a difference between the preset speed, set by a speed control means 5, and the detected speed, detected by a pulse generator 4 (speed detecting means), is within a range of 3 to 7rpm, + or -0.3 to 0.8 times the difference between the preset speed and the detected speed is added to the speed control means 5. While when the difference between the preset speed and the detected speed exceeds 7rpm, + or -1.5 to 2.5 times the difference between the preset speed and the detected speed is added to the speed control means 5. That is, when the actual speed is large detached from the preset value, a large control value is added with the actual speed early fetched to a range of the preset value, while when the actual speed is in a fixed range approximate to the preset speed, a little control value is added for performing a control in a more accurate control range.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for controlling the winding speed of a fiber yarn winder.

More specifically, the present invention relates to a winding speed control method for a fiber yarn winder, which is a winder for glass fiber, etc., and has a winding shaft, a winding drum, etc. having a large diameter and a large moment of inertia as a whole.

[Prior Art] Winding machines for glass fibers, synthetic fibers, etc. have been well known. In these winding machines, the winding diameter is small at the beginning of winding the yarn, so the winding drum is rotated at a relatively high speed, and as the yarn is wound, the winding diameter increases, so the rotation speed of the winding drum increases. It is necessary to reduce the number of rotations until the final winding is completed.

The winding speed control method of these conventional winding machines generally employs closed loop means using feedback control. In other words, the conventional technology includes a rotation speed control means for applying a constant rotation speed to a spindle and a spindle motor, and a rotation speed detection means for detecting the rotation speed of the spindle, and the set rotation speed set by the rotation speed control means is provided. The difference between the rotation speed and the detected rotation speed detected by the rotation speed detection means is directly feedback-controlled.

This conventional technique has been effective for winding machines in which the amount of yarn to be wound is not very large or the winding speed is not very high.

[Problems to be Solved by the Invention] However, recent winding machines for glass fiber, etc., have the diameter of the winding shaft, spindle, etc. larger and the speed has increased in order to improve productivity and save labor. As a result, fiber yarn winding machines with a large overall moment of inertia have appeared, and in such winding machines, it has become difficult to precisely control the winding speed using conventional winding control methods. It's here. If the winding speed is not controlled, the thread count of the product may become uneven, resulting in serious quality defects.

In order to solve the problems of the prior art described above, the present invention performs slight change control when the difference between the set rotation speed and the detected rotation speed is within a certain range, and performs large control when the difference exceeds a certain value. This provides a technology for efficiently, accurately and reliably controlling the actual rotational speed to converge to the set rotational speed in a short time.

[Means to solve the problem] In order to achieve the above object, the present invention has the following configuration.

That is, the present invention includes at least a spindle, a motor for rotating the spindle, a rotation speed control means for imparting a set rotation speed to the motor, and a rotation speed detection means for detecting the rotation speed of the spindle. In the fiber yarn winding machine, when the difference between the set rotation speed set by the rotation speed control means and the detected rotation speed detected by the rotation speed detection means is within the range of 3 to 7 rpm, the set rotation speed is and ±0.3 to 0.8 times the difference between the set rotation speed and the detected rotation speed to the rotation speed control means, and the difference between the set rotation speed and the detected rotation speed is 7r.
When exceeding pm, ± the difference between the set rotation speed and the detected rotation speed.
This is a method for controlling the winding speed of a fiber yarn winding machine, characterized in that the actual rotation speed is controlled to converge to the set rotation speed by adding 1.5 to 2.5 times to the rotation speed control means.

In the above, rpm indicates the number of revolutions per minute.

[Function] The present invention is effective when the difference between the set rotation speed and the detected rotation speed is 3 to 7 rpm.
When within the range of m, ± the difference between the set rotation speed and the detected rotation speed.
083 to 0.8 times is added to the rotation speed control means, and when the difference between the set rotation speed and the detected rotation speed exceeds 7 rpm, the difference between the set rotation speed and the detected rotation speed is ±1.5 to 2.5. By adding the multiplication factor to the rotation speed control means, the
It is possible to control the actual rotation speed to converge to the set rotation speed accurately and reliably. The reason for this is that when the actual rotation speed deviates significantly from the set value, a large control value is added to bring it into the set value range more quickly, and when the actual rotation speed is within a certain range close to the set rotation speed, more precise control values are added. This is to add a small control value to control within the control range. In other words, with a winder that has a large moment of inertia and small load fluctuations, when it is rotating at a rotation speed close to the set value, it will converge to the set rotation speed with a small amount of control, but if it is rotating far from the set value. This is based on the physical principle that when the value is far away, it is difficult to converge to the set value unless a larger control value is added.

As a result, stable rotation control can be obtained in a winding machine that (1) has a large moment of inertia, (2) is a high-speed rotating body, and (2) has small fluctuations in rotational speed with respect to changes in load.

[Example] The method of the present invention will be explained in detail below using the drawings.

Note that the method of the present invention is not limited to the following examples.

FIG. 1 shows an example of the control method of the present invention. 1
indicates an integrated spindle and a motor for rotating the spindle. 2 is an inverter, and 3 is an induction motor. A pulse generator 4 is provided after the induction motor 3 to detect the rotational speed of the spindle l. In this case, the number of revolutions and one pulse do not need to be in a one-to-one relationship.

Note that the pulse generator 4 may be a rotary generator. Reference numeral 5 denotes a rotation speed control means for applying a set rotation speed to the spindle motor. 6 is a rotation number adding means.

In the above device, the difference between the set rotation speed set by the rotation speed control means 5 and the detected rotation speed detected by the rotation speed detection means (pulse generator 4) is 3 to 7 rpm.
When within the range of m, ± the difference between the set rotation speed and the detected rotation speed.
0. 3-0. 8 times is added to the rotation speed control means, and when the difference between the set rotation speed and the detected rotation speed exceeds 7 rpm, the rotation speed is set to ±1.5 to 2.5 times the difference between the set rotation speed and the detected rotation speed. It is added to the control means to control the actual rotation speed to converge to the set rotation speed.

Particularly preferably, the difference between the set rotation speed set by the rotation speed control means 5 and the detected rotation speed detected by the rotation speed detection means (pulse generator 4) is 3 to 7 rpm.
When within the range of m, ± the difference between the set rotation speed and the detected rotation speed.
0.5 times is added to the rotation speed control means, and when the difference between the set rotation speed and the detected rotation speed exceeds 7 rpm, ±2 times the difference between the set rotation speed and the detected rotation speed is added to the rotation speed control means. death,
Controls the actual rotation speed to converge to the set rotation speed. Note that when the difference between the set rotational speed and the actual detected rotational speed is less than 3 rpm, it is preferable not to change the control.

FIG. 2 shows a general relationship between the rotational speed N of the spindle and the winding time T for keeping the yarn winding speed constant.

In other words, the relationship between T and N is N = K (-1/r'T
) (where K is a constant). The above-mentioned control is performed based on the difference between the rotation speed set by this calculation formula and the actual rotation speed (feedback value) detected by the detector.

Figure 3 shows the rotational speed N of the spindle at the start of the present invention.
The relationship between T and winding time T is shown. In other words, at the beginning, it deviates greatly from the set value A, so for example, add twice the difference between the set rotation speed and the detected rotation speed to the rotation speed control means,
Controls the actual rotation speed to converge to the set rotation speed. Next, the difference between the set rotation speed A and the detected rotation speed is 3 to 7 rpm (Figure 3 B to B
When the rotation speed falls within the range 2), ±0.5 times the difference between the set rotation speed and the detected rotation speed is added to the rotation speed control means to control the actual rotation speed to converge to the set rotation speed. Note that the setting value A in Fig. 3 is
In reality, the curve slopes downward to the right as shown in Figure 2, but for the sake of explanation, we will use a minute time period.

Next, FIG. 4 shows a specific configuration example using the present invention. A spindle 11 on which a yarn (for example, a yarn spun by a spinning machine, cooled, treated with an oil, and stretched to a desired degree if necessary) is wound is rotationally driven by a spindle motor 12. The rotation speed of the motor 12 is detected by a rotation speed sensor 21 . The traverse device 13 traverses the yarn to be wound along the spindle 11, and includes a traverse element 13A, a traverse cam 13B that reciprocates the traverse element 13A,
It is composed of a traverse motor 14 that rotates this traverse cam 13B.

This traverse device [113] is connected to the takeoff motor 1 so that it is always at a constant distance from the package surface regardless of the package diameter.
5, it is moved into and out of contact with the package. The rotational speed of the traverse motor 14 is detected by a rotational speed sensor 22, and the winding diameter of a package formed by winding a thread on the spindle 11 is detected by a winding diameter sensor 23.

The control circuit 19 is a circuit including a well-known microprocessor consisting of a CPU, ROM, RAM, input interface (Ilo), and the like. Then, the spindle motor rotation speed Ns and the traverse motor rotation speed Nt are respectively calculated according to the detection signal from the winding diameter sensor (not shown), and the calculated rotation speed and the rotation speed detected by the rotation speed sensors 21 and 22 are combined. The rotation speeds of the motors 12 and 14 are controlled via motor drivers 16 and 17, respectively, according to the deviation of the motors. Further, the departure motor 15 is controlled via a motor driver 18 in response to a detection signal from the winding diameter sensor. A keyboard 24 for inputting various data such as edge angle, wind ratio, yarn speed, winding time, etc. is connected to the control circuit 19, and a display 25 for displaying various data is also connected.

In the specific example of the present invention, preferable winding control can be achieved by incorporating the control means shown in FIG. 1 into the spindle 11.

Although the present invention has been described with respect to winding glass fiber, other yarns such as synthetic fibers can also be used.

In particular, the present invention is preferably applied to a winding machine for glass fibers that can be wound at high speed and with a large winding shape.

[Effects of the Invention] The present invention has the advantage that the difference between the set rotation speed and the detected rotation speed is 3 to 7 rpm.
When within the range of m, ± the difference between the set rotation speed and the detected rotation speed.
0.3 to 0°8 times is added to the rotation speed control means, and when the difference between the set rotation speed and the detected rotation speed exceeds 7 rpm, the difference between the set rotation speed and the detected rotation speed is ±1.5 to . By adding 2.5 times the rotation speed to the rotation speed control means, it was possible to control the actual rotation speed to converge to the set rotation speed efficiently, accurately, and reliably in a short time. The reason for this is that when the actual rotation speed deviates significantly from the set value, a large control value is added to bring it into the set value range more quickly, and when the actual rotation speed is within a certain range close to the set rotation speed, more precise control values are added. This is to add a small control value to control within the control range.

As a result, stable rotation control could be obtained for a winder that (1) has a large moment of inertia, (2) is a high-speed rotating body, and (2) has small fluctuations in rotational speed in response to changes in load.

[Brief explanation of drawings]

FIG. 1 shows an example of the control method of the present invention. FIG. 2 shows a general relationship between the rotational speed N of the spindle and the winding time T for keeping the yarn winding speed constant. Figure 3 shows the rotational speed N of the spindle at the start of the present invention.
The relationship between T and winding time T is shown. FIG. 4 is another overall configuration diagram of the present invention. 1. Spindle and spindle motor 2: Inverter 3: Induction motor 4: Pulse generator 5: Rotation speed control means 6: Rotation speed addition means Fig. 1 Winding time T Winding time T Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] (1) Consists of at least a spindle, a spindle motor for rotating the spindle, a rotation speed control means for imparting a set rotation speed to the motor, and a rotation speed detection means for detecting the rotation speed of a winding drum. In the fiber yarn winding machine, when the difference between the set rotation speed set by the rotation speed control means and the detected rotation speed detected by the rotation speed detection means is within the range of 3 to 7 rpm, the set rotation speed is ±0.3 to 0.8 times the difference between the set rotation speed and the detected rotation speed is added to the rotation speed control means, and the difference between the set rotation speed and the detected rotation speed is 7 rpm.
If the rotation speed exceeds ±1 of the difference between the set rotation speed and the detected rotation speed.
A method for controlling the winding speed of a fiber yarn winding machine, characterized in that the actual rotation speed is controlled to converge to the set rotation speed by adding 5 to 2.5 times the rotation speed to a rotation speed control means.