JPS647569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting the amount of calender bank, that is, the amount of raw material accumulated on a calender roll during calender molding.

In calender molding, keeping the amount of raw material supplied onto the calender roll constant is
This is important for improving product accuracy. Conventionally, the amount of raw material supplied to the calender was adjusted by visually observing the amount of accumulated material in the bank and occasionally adjusting a raw material supply device such as a roll mill. However, this method automatically detects the bank amount between calendar rolls,
This is not a feedback method. As a result, the bank fluctuates, and the thickness of the sheet-shaped product rolled with calender rolls is uneven, resulting in a decrease in yield.

In view of the above circumstances, the present invention has been made in order to provide a method for detecting the amount of calendar banks that accumulates between the calender rolls and performs feedback control, thereby contributing to improving product accuracy.

Embodiments of the present invention will be described below with reference to the drawings.

In the calendar shown in Fig. 1, the upper No. 1 calendar roll 1 forming the calendar bank reservoir and
A reflection type photoelectronic switch 5 is disposed at a predetermined position above the No. 2 calendar roll 2, and the light emitting direction of the photoelectronic switch 5 passes through a predetermined bank 6 position between the calender rolls 1 and 2, and then reaches one of the calender rolls 2. Configure it to face the axis. In the figure, 3 is a No. 3 calender roll, 4 is a No. 4 calender roll, and 7 is a conveyor that conveys and supplies raw materials between the calender rolls 1 and 2.

In such a configuration, when detecting the amount of bank 6 between calender rolls 1 and 2, light is emitted from photoelectronic switch 5 toward the axis of one calender roll 2. At this time, if the banks 6 are accumulated above a predetermined position between the calendar rolls 1 and 2, the light hits the optical bank 6 and is not reflected and is not detected by the photoelectronic switch 5. Therefore, when the reflected light is not detected, it can be detected that the amount of the bank 6 is above a predetermined position, and the signal is sent to a feeding device that sends the raw material to a calender, for example, and then sent to the conveyor 7.
The amount of raw material supplied between the calender rolls 1 and 2 may be reduced by, for example, reducing the amount of raw material supplied to the calender rolls 1 and 2.

On the other hand, when the amount of bank 6 between calender rolls 1 and 2 decreases and its level drops as shown by the two-dot chain line, the light emitted from photoelectronic switch 5 hits the surface of calender roll 2 and is further reflected. and is sensed by the photoelectronic switch 5. Therefore, when the reflected light is sensed, it can be detected that the amount in the bank 6 is below a predetermined position, so the signal is sent to the control device of the feeding device, for example, to increase the amount fed to the conveyor 7, as described above. The amount of raw material supplied between the calender rolls 1 and 2 may be increased by, for example,

In this way, by using the surface of the calendar roll 2 as a reflective surface, the amount of the bank 6 can be easily detected as an ON-OFF signal by the light emitted from the photoelectronic switch 5. Incidentally, even if the light emitting direction of each photoelectronic switch 5 is slightly deviated from the axis of the calendar roll 2, the reflected light can be detected as long as the axis of the roll 2 is within the luminous flux range. In addition, when directly detecting the reflected light from the bank surface, the color and intensity of the reflected light change depending on the surface condition such as the shape, gloss, and color of the bank, so it may not be possible to accurately detect the reflected light depending on the bank. Reflected light cannot be detected, etc.
Although it is greatly affected by the surface condition of the bank, in the present invention, the constant and strong reflected light from the surface of the calender roll 2, which has a much higher light reflectance than the bank material (the two axes of the calender roll and the photoelectronic switch 5 The photoelectronic switch 5 uses whether or not the reflected light (in the direction connecting the two) is blocked by the bank material.
Since it is determined as an ON-OFF signal, it is not affected by surface conditions such as bank shape, gloss, or color.

By the way, in FIG. 1, the reflection type photoelectronic switch 5 was used for explanation. However, it goes without saying that if a transmissive photoelectronic switch or a laser beam emitter and light receiver are used together to perform the same function as the reflective photoelectronic switch 5, the bank amount can be detected in the same way.

In addition, in FIG. 1, the detection of the amount of bank 6 between No. 1 roll 1 and No. 2 roll 2 was explained, but this detection method is applicable to the amount of bank 6 between No. 2 roll 2 and No. 3 roll 3, and between No. 2 roll 2 and No. 3 roll 3. Needless to say, the present invention can also be applied to detecting the bank amount between the No. 3 roll 3 and the No. 4 roll 4.

2 and 3 show another embodiment of the present invention, in which a plurality of, for example, three, photoelectronic switches 5 are arranged above the calendar rolls 1 and 2, and each photoelectronic switch 5 emits light. When arranged so that the directions are shifted in the circumferential direction of the calender roll 1, and the photoelectronic switches 5 are designated as No. 1, No. 2, and No. 3, respectively,
As shown in FIG. 4, the operating time of each photoelectronic switch 5 is sequentially shifted to prevent light interference, and the amount of bank 6 is detected as a digital signal. In the example shown in FIG. 4, the No. 1 photoelectronic switch 5 has an ON signal, and the other two have OFF signals.

When this method is adopted, even if the amount of banks 6 on calendar roll 2 varies, bank 6
By detecting the amount as a counted value and adjusting the amount supplied to the conveyor 7 in proportion to the deviation from the target amount of the bank 6, more accurate detection and stable control can be achieved than in the previous embodiment. Become.

It should be noted that the present invention is not limited only to the above-mentioned embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

As described above, according to the present invention, the bank amount can be accurately detected by the photoelectronic switch without being affected by the surface condition of the bank, and therefore the bank amount can be determined by providing feedback to the raw material supply amount control device. It has excellent effects such as stabilization and improvement of product precision.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a side view showing another embodiment of the invention, Fig. 3 is a perspective view of Fig. 2, and Fig. 4 is a side view showing an embodiment of the present invention. FIG. 4 is a diagram showing the operating sequence of the optoelectronic switch shown in FIG. 3; 1, 2... Calendar roll, 5... Photoelectronic switch, 6... Bank.

Claims (1)

[Claims] 1. In a calender, light is directed from an optical sensor toward the surface of one of the calender rolls that forms the raw material reservoir of the calender, and this light connects the axis of the calender roll on the surface of the calender roll and the optical sensor. Optical sensor turns on and off the presence or absence of reflection in the direction
A method for detecting the amount of a calendar bank, characterized in that the amount of raw material accumulated in a calendar is detected by determining it as a signal. 2. In a calender, light is directed at different positions on the surface of one of the calender rolls that forms the raw material reservoir of the calender from a plurality of optical sensors with a time difference. A method for detecting the amount of calendar bank, characterized in that the amount of raw material accumulated in the calendar is detected by determining the presence or absence of reflection in the direction connecting the sensors as a digital signal using each optical sensor.