JP2001356053A - Temperature-measuring apparatus and its temperature measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring technique of a temperature-measuring apparatus whereby a temperature of a yarn-shaped body of any kind and any processing conditions can be correctly measured without errors although a measured value obtained by converting a detection signal from a yarn thermometer and the actual temperature of the yarn-shaped body do not necessarily agree because of various disturbances. SOLUTION: This temperature-measuring apparatus 15 is constituted of the non-contact thermometer 21, a switching part 16d for switching a heater 3 stepwise, a converting part 16b for converting the detection signal of the non- contact thermometer 21 to a yarn temperature value with the use of a conversion constant, and a correcting part 16e for correcting the conversion constant on the basis of a correlation between each set temperature of the heater 3 and the yarn temperature value corresponding to each set temperature. A plurality of conversion constants corresponding to kinds of yarns, thicknesses of yarns and the like processing conditions are stored in a storage part 16e of the temperature-measuring apparatus 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a measuring technique of a temperature measuring device for measuring a temperature of a measuring object which is a thread such as a synthetic fiber without contact.

[0002]

2. Description of the Related Art For example, a thermoplastic synthetic fiber such as polyester or polyamide which is a filamentous material is subjected to thermal processing by a false twisting machine to be shrunk to be processed into a highly elastic processed yarn. is there. In this case, if the temperature at the time of performing the thermal processing is inappropriate or fluctuates, the properties of the processed fibrous body may be uneven, resulting in uneven dyeing of the fibrous body or variation in tensile strength. Therefore, it is necessary to accurately maintain the temperature of the filament during processing at a predetermined temperature.

When the temperature of the filament for controlling the temperature of the filament during processing is monitored by measuring the temperature of the heater, thread debris accumulates on the heater and oil mist for processing adheres. In such a case, since a temperature difference occurs between the heater temperature and the filament temperature, the filament temperature cannot be accurately grasped. In addition, when directly measuring the temperature of the filament, if a contact-type thermometer that measures the temperature by contacting the temperature detector with the filament is used, the temperature of the filament escapes to the temperature detector and decreases. In addition, the filament temperature cannot be accurately grasped. Therefore, the temperature of the filament is directly measured using a non-contact thermometer such as an infrared radiation thermometer that can measure the temperature without contacting the filament, and the temperature of the filament is accurately grasped. It is possible.

[0004]

The infrared radiation thermometer for measuring the temperature of the filament as described above measures the temperature by detecting infrared rays radiated from the filament to be measured. The emissivity of the filament varies depending on the yarn type, and the amount of radiation from the filament varies depending on the yarn thickness. It is necessary to previously input a conversion constant between the detected value of the radiation thermometer and the actual temperature of the filament.

However, there are endless combinations of yarn processing conditions such as yarn thickness and yarn type, and there is a limit to the number of conversion constants that can be input. Is desirable. For this reason, there may not be a conversion constant suitable for the thread to be processed, and as a result, a conversion constant closest to the processing condition may be used. Also, due to various disturbances, the yarn temperature value calculated by the conversion constant does not always match the actual temperature of the filament, and the filament temperature may not be accurately displayed,
As a result, the quality of the processed yarn may be affected, such as the dyeability and tensile strength of the processed thread.

Accordingly, an object of the present invention is to provide a measuring technique of a temperature measuring device capable of accurately and accurately measuring the temperature of a filament without error under all kinds of thread types and thread processing conditions.

[0007]

The present invention uses the following means to solve the above problems.
That is, in the first aspect, a yarn thermometer for detecting the yarn temperature in a non-contact state, a means for switching the set temperature of the yarn heating device in a stepwise manner, and a yarn constant using a conversion signal for the detection signal of the yarn thermometer. The temperature measuring device includes means for converting the temperature into a temperature value, and means for correcting the conversion constant based on the correlation between each set temperature of the yarn heating device and the corresponding yarn temperature value.

According to a second aspect of the present invention, in the temperature measuring device, a storage unit for storing a plurality of conversion constants according to processing conditions and the like is provided.

According to a third aspect of the present invention, the set temperature of the yarn heating device is switched in a stepwise manner.
The yarn temperature value is calculated from the detection signal of the yarn thermometer using the conversion constant stored in advance, and the conversion constant is corrected based on the correlation between each set temperature of the yarn heating device and the corresponding yarn temperature value.

[0010]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a schematic view showing a false twisting machine, FIG. 2 is a perspective view of a temperature measuring device for measuring the temperature of a filament in a non-contact state, FIG. 3 is a plan view of the same, and FIG. 4 is a temperature measuring device according to the present invention. FIG. 5 is a block diagram showing a temperature measuring mechanism, FIG. 5 is a flowchart showing correction of a filament-measured temperature by the temperature measuring device according to the present invention, and FIG. 6 is a graph showing correction of a filament-measured temperature by the temperature measuring device according to the present invention. is there.

A schematic configuration of a false twister provided with a temperature measuring device 15 for detecting and measuring the temperature of a filament will be described.
In the false twisting machine shown in FIG. 1, the thread Y unwound from the yarn supply package 6 is formed by a first feed roller 11 and a second feed roller 12 disposed downstream of the first feed roller 11. It is maintained at a drawable yarn tension. A false twisting device 5 is provided at a downstream portion between the first and second feed rollers 11 and 12. The filament Y is twisted by the false twisting device 5, and the filament Y between the first feed roller 1 and the false twisting device 5 (twisting region) is in a twisted state in which the twist is contained. .

The first and second feed rollers 11.1
A heater 3 for heat fixing is provided in an upstream portion between the two. The heater 3 comprises a twisted filament Y
Is heated to the stretching temperature, and the heating temperature is
The temperature is controlled accurately based on the heater temperature detected by a temperature sensor (not shown) such as a thermocouple built in the heater 3 or the temperature of the filament Y detected by the temperature measuring device 15. A cooling plate 4 is provided downstream of the heater 3 to cool the filament Y heated by the heater 3.

A second heater 8 is provided between the second feed roller 12 and the third feed roller 13 to heat the filament Y again. Thereafter, the filament Y is subjected to an oiling process by the oiling device 9 and wound up by the winding package 7. As described above, in the false twisting machine, twist is given while the filament Y unwound from the yarn supply package 6 is stretched, and the twist is heat-fixed, so that the filament Y is processed into a bulky yarn. Like that.

Next, the temperature measuring device 15 will be described. The temperature measuring device 15 measures the temperature of the filament Y passing through the temperature measuring device 15, and the filament Y is attached to the temperature measuring device 15 so that the transmission of the twist of the filament Y is not hindered. The vehicle travels in a substantially non-contact state without being bent inside. The temperature measuring device 15 is disposed, for example, near the outlet (downstream end) of the heater 3.

The temperature measuring device 15 includes, for example, a non-contact type thermometer 21 for measuring the temperature of the filament Y and a filament Y.
And a pair of thread guides 23 arranged at appropriate intervals in the running direction of the thread Y. The non-contact type thermometer 21 and the yarn thickness detector 22 include a pair of thread guides 2.
The yarn thickness detector 22 is disposed between the positions 3 and 23, and is disposed upstream of the non-contact type thermometer 21 in the running direction of the filament Y.

The non-contact type thermometer 21 is, for example, an infrared radiation thermometer for measuring a temperature by detecting infrared rays radiated from a filament Y which is an object to be measured. , For example, a slab catcher of the photoelectric capacitance type or the capacitance type. The yarn thickness detector 22
Also detects the thickness of the running filament Y in a substantially non-contact state.

The pair of thread guides 23, 23 are formed with slit-like guide portions 23a, respectively, and the thread members Y are guided by the guide portions 23a, 32a. The thread Y traveling while intermittently contacting the guide portions 23a is provided with a thread thickness detector 22a of the thread thickness detector 22 and a thread temperature detector 2 of the non-contact thermometer 21.
1a, and when passing through the yarn thickness detector 22a,
The yarn thickness is detected, and the yarn temperature is detected when passing through the yarn temperature detection unit 21a.

Next, a method of measuring the temperature by the temperature measuring device 15 will be described. As shown in FIG. 4, the storage unit 16a in the controller 16 of the temperature measurement device 15 includes
A conversion constant for converting a detection signal of the non-contact type thermometer 21 into an actual temperature of the filament Y for a plurality of filaments Y having a specific thickness is stored for each thread type. For example, the conversion constant between the detection signal and the actual temperature for a polyester having a thickness of 300 denier and the conversion constant between the detection signal and the actual temperature for a polyamide having a thickness of 75 denier are stored. ing.

When measuring the temperature of the running filament Y, first, the thread type of the filament Y is set in the controller 16 of the temperature measuring device 15. Then, the detection signal of the yarn thickness by the yarn thickness detection unit 22a of the yarn thickness detector 22 and the detection signal of the yarn temperature by the yarn temperature detection unit 21a of the non-contact type thermometer 21 are input to the controller 16. You. In the controller 16, the thread thickness of the thread Y is recognized from the input thread thickness detection signal, and is recognized from among the conversion constants for a plurality of thread thicknesses stored in the storage unit 16 a. A conversion constant for the yarn thickness that matches the yarn thickness is selected, and a yarn temperature corresponding to the yarn temperature detection signal is calculated based on the conversion constant.

If the conversion constant for the yarn thickness that matches the yarn thickness recognized based on the detection signal is not among the conversion constants stored in the storage unit 16a, the closest conversion constant among the stored conversion constants is used. The yarn temperature is calculated using a conversion constant for the yarn thickness.

When the thread thickness is known in advance from the processing conditions of the thread Y, the thread thickness is set in the controller 16 without providing the thread thickness detector 22. The yarn temperature may be calculated from the conversion constant of the storage unit 16a for the determined yarn thickness.

The controller 16 of the temperature measuring device 15
And a display unit 17 of the main body 21 of the non-contact type thermometer 21.
b or the like, or can be formed separately. Further, the filament Y is a concept including not only a thread composed of a thermoplastic synthetic fiber such as polyester or polyamide, but also other filament members.

As described above, the temperature measuring device 15 can measure the yarn temperature of the filament Y according to the thread type and the processing conditions. Temperature measurement device 15 to more accurately measure
The automatic correction device 16c is incorporated in the controller 16 of FIG.
Hereinafter, the temperature measurement device 15 including the automatic correction device 16c according to the present invention will be described.

As shown in FIG.
c is a switching unit 16d that switches the set temperature of the heater 3 in a stepwise manner, and a correction that corrects and corrects the conversion constant based on the correlation between each set temperature of the heater 3 and each yarn temperature value calculated at the set temperature. And a converter 16b for converting a detection signal from the temperature measuring device 15 into a yarn temperature value using a conversion constant, and is incorporated in the controller 16 of the temperature measuring device 15.

As shown in FIG. 5, when measuring the temperature of the filament Y, first, the thread is threaded on a false twisting machine to prepare for thread processing, and the thread type of the filament Y is measured by a temperature measuring device 15. (Start S). Next, heater 3
Is set, and the heater 3 is heated to a set value (step T1). At this time, the heater 3 can be heated based on, for example, a value detected by a temperature sensor (not shown) built in the heater 3. Then, the yarn temperature at that time is detected and measured by the temperature measuring device 15 by the method described above (step T2), and the detection signal is read into the storage unit 16a of the main controller (step T2).
3). The storage unit 16a selects a conversion constant to a yarn temperature value suitable for the processing state of the yarn based on the detection signal (step T4), and converts the detection signal into a yarn temperature value by the conversion constant (step T4). Step T5). Then, the yarn temperature value and the set value of the heater 3 at that time are read and stored in the storage unit 16a (step T6).

Next, the set temperature of the heater 3 is compared with the upper limit temperature of the heater 3 (step 7), and when the set temperature is lower than the upper limit temperature, the set temperature of the heater 3 is separately set by the switching section 16d. The temperature is switched (step 8), and the flow from step T1 to step T6 is performed again under the different set temperature, the yarn temperature value at the different set temperature is calculated, and read into the storage unit 16a. Thus, the above-described series of flow is repeated until the set temperature of the heater 3 reaches the upper limit temperature of the heater 3. The switching unit 16
Usually, the set temperature of the heater 3 by d is automatically switched, but it may be configured to be manually switched by providing a set temperature adjustment knob or the like. Further, at least two yarn temperature values for the temperature set value of the heater 3 must be calculated.

Then, when the set temperature of the heater 3 reaches the upper limit temperature of the heater 3, the amount of change in the yarn temperature value with respect to the temperature value of the heater 3 based on the data of a plurality of yarn temperature values measured next. Is calculated, and it is determined whether the amount of change is within a predetermined range (step T9). When the variation of the yarn temperature value is within the predetermined range, the yarn temperature value is calculated using the conversion constant as it is (Halt H), while the variation amount of the yarn temperature value is not within the predetermined range. At this time, the conversion constant is corrected and corrected so that the variation falls within the predetermined range (step T10), and a new conversion constant is set to calculate the yarn temperature value (Halt H).

Next, the correction of the conversion constant in the controller 16 will be described in detail. FIG. 6 is a graph in which the set temperature of the heater 3 is plotted on the horizontal axis and the measured values of the heater temperature and the yarn temperature at that time are plotted on the vertical axis. Usually, the yarn temperature calculated by the temperature gradient of the heater temperature and the conversion constant is used. The value does not always coincide with the temperature gradient. Therefore, the conversion constant is corrected in the following procedure so that the temperature change of the yarn temperature value accurately follows the temperature change of the heater 3.

First, at least two or more yarn temperature values with respect to the set temperature value of the heater 3 are calculated, and the set temperature of the heater 3 is calculated as b1 (° C.) based on the conversion constant. Set temperature of heater 3 is a2 (° C)
Let b2 (° C.) be the yarn temperature value calculated in. At this time, the amount of temperature change of the heater 3 is 1 (= (a2-a1) / (a2
−a1)), and the change amount k1 of the yarn temperature value is as follows: k1 = (b2−b1) / (a2−a1) Here, the error related to the predetermined range is e (e ≧ e ≧
0), and when | k1-1 | ≦ e, the yarn temperature value is directly calculated using the conversion constant. On the other hand, when | k1-1 |> e, the conversion constant is corrected, and Calculate the appropriate conversion constant.

That is, based on the new conversion constant, the yarn temperature value calculated when the set temperature of the heater 3 is a1 (° C.) is c1 (° C.), and the yarn temperature value calculated when the set temperature of the heater 3 is a2 (° C.) Is set to c2 (° C.), and at this time, the change amount k2 of the new yarn temperature value is k2 = (c2−c1) / (a2−a1). The conversion constant is set such that the relational expression of | k2-1 | ≦ e holds between the e and e, that is, the change amount k2 of the yarn temperature falls within a predetermined range based on the change amount of the temperature of the heater 3. to correct. As a result, the straight line connecting the yarn temperature values corrected by the new conversion constant shown in FIG. 6 is substantially parallel to the straight line indicating the temperature change of the heater 3, and the temperature change of the corrected yarn temperature value is the temperature change of the heater 3. And the yarn temperature value can be calculated more accurately.

The set temperature of the heater 3 (= measured temperature)
Is corrected from b1 to c1 when the yarn temperature value is a1 because the yarn temperature value b1 has deviated from the set temperature a1 by a large amount. When the difference between b1 and a1 is within a predetermined range, the yarn temperature value is corrected. The conversion constant may be corrected so as to correct only the amount of change in the value.

The correction of the conversion constant may be carried out for all weights, or for one or several weights in the same group in which a thread having the same yarn type and thickness is set. Typically, the correction result may be reflected on other weights, and the conversion constant of the yarn temperature value in all weights may be determined uniformly.

By improving the temperature measuring device 15 in this way, it is possible to obtain an accurate conversion constant according to the yarn type and the yarn processing conditions. As a result, the filament constant can be more accurately determined using the conversion constant. Temperature measurement can be performed, and measurement accuracy can be improved.

In this embodiment, the set temperature of the heater 3 is set to 2
However, it goes without saying that three or more may be used.

[0035]

According to the present invention having the above-described configuration, the following effects can be obtained. That is, as in claim 1, a yarn thermometer for detecting the yarn temperature in a non-contact state, a means for switching the set temperature of the yarn heating device in a stepwise manner, and a detection signal of the yarn thermometer using a conversion constant. Since the temperature measuring device is provided with means for converting to a yarn temperature value, and means for correcting the conversion constant based on the correlation between each set temperature of the yarn heating device and the corresponding yarn temperature value, the yarn type is improved. In addition, an accurate conversion constant according to the thread processing conditions can be obtained. As a result, the temperature of the filament can be measured more accurately using the conversion constant, and the measurement accuracy can be improved.

Further, since a storage unit for storing a plurality of conversion constants according to processing conditions and the like is provided in the temperature measuring device as described in claim 2, it is possible to accurately control the yarn shape in various yarn types and processing conditions. The body temperature can be measured, and the versatility of the temperature measuring device is increased.

Then, the set temperature of the yarn heating device is switched stepwise, and the yarn temperature value is calculated from the detection signal of the yarn thermometer using the conversion constant stored in advance for each set temperature. By taking a temperature measuring method of correcting the conversion constant based on the correlation between each set temperature of the yarn heating device and the corresponding yarn temperature value, an accurate conversion constant according to the yarn type and yarn processing conditions can be obtained. As a result, the temperature of the filament can be more accurately measured using the conversion constant, and the measurement accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a false twisting machine.

FIG. 2 is a perspective view of a temperature measuring device that measures the temperature of the filament in a non-contact state.

FIG. 3 is a plan view of the same.

FIG. 4 is a block diagram showing a temperature measuring mechanism of the temperature measuring device according to the present invention.

FIG. 5 is a flowchart showing correction of a filament measurement temperature by the temperature measurement device according to the present invention.

FIG. 6 is a graph showing correction of a filament-measured temperature by the temperature measuring device according to the present invention.

[Explanation of symbols]

 Y Filament 3 Heater 15 Temperature measurement device 16 Controller 16a Storage unit 16b Conversion unit 16c Automatic correction unit 16d Switching unit 16e Correction unit 21 Non-contact thermometer 21a Thread temperature detection unit

Continuation of the front page (72) Inventor Keishiro Takakura 1 Nishinokyo Kuwaharacho, Nakagyo-ku, Kyoto F-term in Shimadzu Corporation (reference) 2G066 AC16 BC11 4L036 AA01 MA33 PA05 PA17 UA25

Claims (3)

[Claims] 1. A yarn thermometer for detecting a yarn temperature in a non-contact state, means for switching a set temperature of a yarn heating device in a stepwise manner, and a detection signal of the yarn thermometer being converted into a yarn temperature value using a conversion constant. A temperature measuring device comprising: means for converting; and means for correcting the conversion constant based on a correlation between each set temperature of the yarn heating device and a yarn temperature value corresponding thereto. 2. The temperature measuring device according to claim 1, wherein a storage unit for storing a plurality of conversion constants according to processing conditions and the like is provided in the temperature measuring device. 3. The set temperature of the yarn heating device is switched in a stepwise manner, and for each set temperature, a yarn temperature value is calculated from a detection signal of a yarn thermometer using a conversion constant stored in advance. A temperature measuring method, wherein the conversion constant is corrected based on a correlation between a set temperature and a yarn temperature value corresponding to the set temperature.