JP2000211813A - Fiber winding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the revolviong speed of a collet in the neighborhood of the target revolving speed value while quick followup is made for the target speed value varying from time to time and prevent hunting effectively even in case the target value is largely different from the actual revolving speed. SOLUTION: The value obtained by multiplying the difference ΔN between the actual revolving speed N of a collet 2 and its target speed value NO by a proportioning control constant (k) is fed to an inverter 4 as a command value S, wherein the constant (k) is changed over into 0.1 when ΔN lies within 3 rpm, 0.5 when between 3 and 10 rpm, and 0.2 when exceeding 10 rpm. Thereby effective control is continued in the range free of hunting when N lies far from NO, and the followup characteristic is raised by introducing a comparatively large feedback when N approaches NO and the feedback is lessened when further approached so that overshoot is prevented effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber winding device suitably used for spinning and winding glass fibers and the like.

[0002]

2. Description of the Related Art As a fiber winding device of this type, there is known a fiber winding device in which the rotation of a collet is controlled by a general-purpose inverter, and the fiber is wound around a package provided on the collet. In other words, since the peripheral speed increases as the package becomes thicker, the rotational speed is accordingly reduced over time, and the winding speed is kept constant even if the package is thicker, thereby preventing the fiber diameter from becoming thinner. ing.

[0003]

The rotation speed command to the inverter is output from the control means in accordance with the winding condition. The output amount is the rotation speed between the target rotation speed and the actual rotation speed. The difference may be detected and corrected. In the case of such a correction, simple proportional control is adopted for reasons such as the internal control of the inverter is unclear, the inertia of the load is extremely large with respect to the power, and the calculation time is limited, Usually, the proportional constant is switched between two stages depending on the difference between the actual rotation speed and the target rotation speed.

However, the switching of the proportional control constant is conventionally performed such that the feedback amount is doubled by increasing the value when the rotational speed difference is large, and reduced by half when the rotational speed difference is small. It's just a simple method. For this reason, when the amount of feedback exceeds the acceleration / deceleration curve of the inverter for a load with large inertia when the rotational speed difference is large, hunting is likely to occur, and the rotational speed difference is small and the feedback amount is suppressed more than necessary. However, the problem that the response becomes poor when it is used cannot be wiped.

[0005]

In order to solve the above-mentioned problems, the present invention comprises control means for controlling, via an inverter, the number of revolutions of a collet to which a fiber winding package is mounted. This control means calculates a rotation speed difference from the actual rotation speed of the collet and a target rotation speed according to the winding conditions, and outputs a value obtained by multiplying the rotation speed difference by a proportional control constant to the inverter as a command value. In the control means, a switching unit for switching the proportional control constant in three stages is provided in the control unit, and the switching unit changes the proportional control constant between the actual rotational speed of the collet and the target rotational speed. When the number difference is within the first reference value, a small value (k
In 1), when the value exceeds the first reference value and falls within the second reference value, the value is switched to a large value (k2), and when the value exceeds the second set value, the value is switched again to a small value (k3). It is characterized in that. That is, the switching is basically intended to be determined so as to satisfy k1 <k2 and k3 <k2.

With such a configuration, when the rotation speed difference between the actual rotation speed and the target rotation speed is between the first reference value and the second reference value, relatively large feedback is applied. On the other hand, when the actual rotational speed can quickly follow the target rotational speed, when the rotational speed difference falls within the first reference value, the proportional control constant is suppressed to a small value. It is possible to effectively prevent the rotational speed from overshooting beyond the target rotational speed. On the other hand, according to the present invention, the proportional control constant is reduced when the rotational speed difference exceeds the second reference value. The integrated value of the correction can be increased at a speed corresponding to the response speed within a range not exceeding, and it is possible to effectively prevent an excessive correction.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. The fiber winding device of this embodiment is for winding glass fibers or the like, and is configured by assembling element parts such as a collet 2 with a winding device main body 1. More specifically, a rotating plate 3 is provided on the front surface of the winding device main body 1, and the rotating plate 3 has two collets 2 (A,
B) are protruded in parallel, and the space therebetween is partitioned by a shielding plate (not shown), and each collet 2 is driven to rotate by an internal motor M. The collet 2 is expandable and contractible in the radial direction, and is configured so that a package (not shown) can be attached and detached.
It has a relatively large inertia of mm, diameter 300 mm and weight 140 kg. Also, the motor M has
A 7.5 kW output, 4-pole type is employed.
On the other hand, a traverse mechanism (not shown) is provided at a position displaced in an oblique direction from the axis of the collet 2, and the traverse mechanism traverses glass fibers (strands) led out of the furnace and collected into one. Glass fiber is wound around the package.

In such a fiber winding device, the peripheral speed increases as the package becomes thicker, and accordingly, the rotation speed of the collet 2 is reduced with time, and the winding speed is reduced even if the package becomes thicker. It is necessary to keep the fiber constant to prevent the fiber diameter from becoming thin. Therefore, in the present embodiment, the rotation speed of the collet 2 is controlled by the control means 5 via the inverter 4 of, for example, about 15 KW output, and the target rotation speed N0 is controlled according to the winding condition set from the operation panel 6. In this case, the calculation is performed inside the control means 5. The winding conditions set on the operation panel 6 are as follows:
For example, as shown in FIG. 2, after once starting up to a steady operation of 4000 rpm, the number of rotations is 4000 to 2500 rpm.
about 1r every fixed time (for example, 10 sec) in the range of pm
The content is reduced by pm.

On the other hand, in this embodiment, the actual rotation speed N of the collet 2 is taken into the control means 5 in the form of a pulse train by a pickup sensor 8 which detects a slit 7 provided behind the collet 2. Then, a rotational speed difference ΔN is obtained from the actual rotational speed N and the target rotational speed N0, and a value obtained by multiplying the rotational speed difference ΔN by a proportional control constant k is input to the inverter 4 as a command value S. I have. At this time, the control means 5 is provided with a switching section 9 for switching the proportional control constant k in three stages, and the switching section 9 changes the proportional control constant k to the actual rotational speed N as shown in FIG. When the rotation speed difference ΔN between the target rotation speed N0 and the target rotation speed N0 is within the first reference value ΔN1 (eg, 3 rpm), the rotation speed difference ΔN exceeds the first reference value ΔN1 (3 rpm) to a small value k1 (eg, 0.1). When it is within the second reference value ΔN2 (for example, 10 rpm), it becomes a large value k2 (for example, 0.5), and when it exceeds the second reference value ΔN2 (10 rpm), it becomes a small value k3 (for example, 0.2) again. ).

With such a configuration, the rotation speed difference ΔN between the actual rotation speed N and the target rotation speed N0 is equal to the first reference value Δ
When the value is between N1 and the second reference value ΔN2, a relatively large feedback is applied because the proportional control constant k2 is large, and the actual speed N can quickly follow the target speed N0. , The rotational speed difference ΔN is the first
Is within the reference value ΔN1, the proportional control constant k is suppressed to a small value k1, and the actual rotation speed N is effectively prevented from overshooting beyond the target rotation speed N0, and a stable constant rotation state is achieved. Is achieved. On the other hand, in this embodiment, the proportional control constant k is set to a small value k3 when the rotation speed difference ΔN exceeds the second reference value ΔN2.
For the collet 2 with large inertia and extremely poor response,
The integrated value of the correction can be increased at a speed corresponding to the response speed within a range that does not exceed the acceleration / deceleration curve of the inverter 4, and excessive correction can be effectively prevented. For example, in the related art, hunting occurs when there is a rotational speed difference of 10 rpm or more, and control may be lost. However, according to this embodiment, it is possible to cope with a rotational speed difference of 50 rpm or more. It is also possible to improve the followability to the number N0 and the stability at the time of constant rotation.

The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, a setting in which the proportional control constant is further finely divided and switched in each reference value is also effective.

[0012]

As described above, the present invention can stabilize the rotation speed of the collet in the vicinity of the target rotation speed as compared with the related art, and can quickly operate the collet in response to the constantly changing target rotation speed. Followability can be realized. In addition, even when the target rotational speed is far away from the actual rotational speed, control can be effectively performed over a wide range without causing hunting.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is a graph showing an example of a winding condition in the embodiment.

FIG. 3 is a graph showing a relationship between a rotational speed difference and a proportional control constant in the embodiment.

[Explanation of symbols]

 2 ... Collet 4 ... Inverter 5 ... Control means 9 ... Switching unit k ... Proportional control constant N ... Actual speed N0 ... Target speed ΔN ... Speed difference ΔN1 ... First reference value ΔN2 ... Second reference value

Claims (1)

[Claims] The present invention further comprises control means for controlling, via an inverter, the number of revolutions of a collet to which a fiber winding package is mounted, the control means controlling the actual number of revolutions of the collet and winding conditions. A rotational speed difference is obtained from the corresponding target rotational speed, and a value obtained by multiplying the rotational speed difference by a proportional control constant is output to the inverter as a command value. A switching unit that switches over the stages is provided. In this switching unit, the proportional control constant is set to a small value when the difference between the actual rotation speed of the collet and the target rotation speed is within the first reference value. When the value exceeds the first reference value and falls within the second reference value,
Further, when the value exceeds the second set value, the value is switched to a smaller value again.