JP4616032B2 - Tire cord heat treatment determination apparatus, tire cord heat treatment determination method, and tire cord heat treatment determination program - Google Patents

Description

  The present invention relates to a tire cord heat treatment determination apparatus and a tire cord heat treatment determination method for detecting an atmospheric temperature in a heat treatment furnace for performing a heat treatment with hot air on a tire cord, which is a twisted fiber cord used for a pneumatic tire, using a temperature measuring device. And a tire cord heat treatment determination program.

  Conventionally, tire cords (twisted fiber cords) made of organic fiber cords such as PET fibers have been widely used for pneumatic tires. Such a tire cord is heated by hot air for a certain time in a heat treatment furnace (so-called HT machine) in order to ensure adhesion with rubber (for example, Patent Document 1).

In the heat treatment furnace, high-temperature air (hot air) generated using a burner using LPG or kerosene as fuel is blown from a blow-out port by a blower. The air blown from the outlet is returned to the outlet through the circulation duct and is heated again by the burner.
JP-A-6-280167 (page 3)

  By the way, in the above-described heat treatment furnace, air circulates through the circulation duct, and accordingly, dust such as scale adheres to the blowout opening or the like according to the amount of the heat-treated tire cord. When dust such as a scale adheres to the blowout port or the like, the amount of hot air blown from the blowout port gradually decreases, and the amount of heat received by the tire cord in the heat treatment furnace also decreases.

  For this reason, if regular cleaning of the blower including the blowout opening is neglected, the tire cord is not sufficiently heat-treated, and the tire cord after heat treatment and adhesive treatment (so-called Dip anti) obtains the required physical properties. There was a problem that it was impossible.

  In order to avoid this problem, periodic cleaning of the blower is indispensable, but since the relationship between the cleaning interval of the blower and the physical properties of the tire cord (Dip anti) is not clear, the tire cord (Dip anti However, there is a problem that it is not possible to maximize the cleaning interval such as the outlet while securing the physical properties required for the above.

  Therefore, the present invention has been made in view of such a situation, and makes it possible to recognize the optimum cleaning timing of the air blower in the heat treatment furnace while ensuring the physical properties required for the tire cord (Dip anti). An object of the present invention is to provide a tire cord heat treatment determination apparatus, a tire cord heat treatment determination method, and a tire cord heat treatment determination program.

In order to solve the above-described problems, the present invention has the following features. First, the first feature of the present invention is that a tire cord (tire cord 20), which is a twisted fiber cord used for a pneumatic tire, is normally heat-treated by hot air (hot air W) in a heat treatment furnace (heat treatment furnace 10). A tire cord heat treatment determination apparatus (tire code heat treatment determination computer 150) for determining whether or not a heat treatment furnace is applied, and detects an atmospheric temperature in the heat treatment furnace based on a state of a temperature measuring device provided in the heat treatment furnace And a maximum temperature (maximum temperature T _MAX ) of the tire cord during heat treatment of the tire cord based on the ambient temperature detected by the ambient temperature detection unit (atmosphere temperature detection unit 151) and the ambient temperature detection unit Holding time (holding time) in which the temperature of the tire cord is held within the maximum temperature range (maximum temperature range R _MAX ) including P _MAX ) and a holding time estimation unit (tire code temperature estimation unit 155), and when the holding time estimated by the holding time estimation unit falls below a predetermined threshold, the holding time falls below a predetermined threshold. The gist is to include a notification unit (notification unit 157) that notifies the fact.

  According to such a feature, based on the atmospheric temperature in the heat treatment furnace, the holding time during which the tire cord temperature is held in the maximum temperature range including the maximum temperature of the tire cord during the heat treatment of the tire cord is estimated. .

  Here, the inventor based on the knowledge that the physical properties of the tire cord (Dip anti) after the heat treatment and the adhesive treatment are determined by the maximum temperature of the tire cord reached by the heat treatment and the holding time thereof. The retention time is estimated.

  That is, according to such a feature, it is possible to determine whether or not the physical properties required for the tire cord (Dip counter) can be ensured based on the estimated holding time.

  Further, when the holding time falls below a predetermined threshold value, the fact is notified, so that the operator of the heat treatment furnace or the like can recognize the optimum cleaning timing of the blower in the heat treatment furnace.

  A second feature of the present invention relates to the first feature of the present invention, wherein the ambient temperature detector detects a plurality of ambient temperatures by a plurality of temperature measuring devices (for example, thermocouples 131 to 138). The gist of the holding time estimation unit is to estimate the holding time by at least a calculation according to a finite element method using a plurality of data of the ambient temperature.

  A third feature of the present invention is a tire cord heat treatment determination method for determining whether a tire cord, which is a twisted fiber cord used for a pneumatic tire, is normally heat treated by hot air in a heat treatment furnace, Detecting the atmospheric temperature in the heat treatment furnace based on the state of a temperature measuring device provided in the heat treatment furnace, and heat treatment of the tire cord based on the atmospheric temperature detected in the detecting step Estimating a holding time during which the temperature of the tire cord is held in a maximum temperature range including a maximum temperature of the tire cord in the inside, and the holding time estimated in the estimating step being less than a predetermined threshold value And a step of notifying that the holding time has fallen below a predetermined threshold.

A fourth feature of the present invention relates to the third feature of the present invention, and in the step of detecting the ambient temperature, a plurality of the ambient temperatures are detected by a plurality of the temperature measuring devices,
The gist of the step of estimating the holding time is to estimate the holding time at least by a calculation according to a finite element method using the atmospheric temperature data.

A fifth feature of the present invention is a tire cord heat treatment determination program for determining whether a tire cord, which is a twisted fiber cord used for a pneumatic tire, is normally heat treated by hot air in a heat treatment furnace, Based on the ambient temperature detection procedure for detecting the ambient temperature in the thermal treatment furnace based on the state of the temperature measuring device provided in the thermal treatment furnace on the computer, and the ambient temperature detected in the ambient temperature detection procedure And a holding time estimation procedure for estimating a holding time during which the temperature of the tire cord is held in a maximum temperature range including a maximum temperature of the tire cord during the heat treatment of the tire cord, and an estimation in the holding time estimation procedure. When the holding time falls below a predetermined threshold, it is notified that the holding time has fallen below a predetermined threshold. And summarized in that to execute the that notification procedure.

  A sixth feature of the present invention relates to the fifth feature of the present invention, wherein, in the ambient temperature detection procedure, a plurality of the ambient temperatures are detected by a plurality of the temperature measuring devices, and in the retention time estimation procedure, The gist is to estimate the holding time by at least a calculation according to a finite element method using a plurality of data of the ambient temperature.

  According to the features of the present invention, a tire cord heat treatment determination device and a tire cord heat treatment determination that can recognize the optimum cleaning timing of the blower in the heat treatment furnace while ensuring the physical properties required for the tire cord (Dip anti-). A method and a tire cord heat treatment determination program can be provided.

  Next, an embodiment of a pneumatic tire according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(Schematic configuration of heat treatment furnace including tire cord heat treatment determination device)
FIG. 1 shows an overall schematic configuration of a heat treatment furnace including a tire cord heat treatment determination device according to the present embodiment. As shown in the figure, the heat treatment furnace 10 is provided with a blower 100 that is used to heat-treat the tire cord 20 with hot air W.

  The blower 100 blows hot air W, which is air heated by a burner (not shown) using LPG or kerosene as fuel, from the nozzle port 101.

  The hot air W blown from the nozzle port 101 heats the tire cord 20 and then returns to the nozzle port 101 side of the blower 100 through the circulation duct 110 and is heated again by the burner.

  The tire cord 20 is a twisted fiber cord of an organic fiber (for example, PET fiber) used for a pneumatic tire for automobiles, and is constant at a high temperature (for example, 240 ° C.) in order to ensure adhesion with rubber. Heat for a time (eg, 80 seconds).

  The tire cord 20 is moved by the feed rollers 30A to 30E while receiving the hot air W in the direction of the arrow AR at a constant speed.

  The tire cord heat treatment determination computer 150 (tire code heat treatment determination device) estimates the temperature of the tire cord 20 based on the ambient temperature in the heat treatment furnace 10 and determines whether the tire cord 20 is heated at a predetermined temperature for a certain time. This is a judgment.

  Specifically, the tire cord heat treatment determination computer 150 is connected to thermocouples 131 to 138 (not shown in FIG. 1, refer to FIGS. 2A and 2B) installed in the heat treatment furnace 10. Based on the state of the thermocouples 131 to 138 (temperature measuring device), the temperature of the tire cord 20 is estimated.

  Further, when the tire cord heat treatment determination computer 150 determines that the tire cord 20 has not been heated at a predetermined temperature for a certain period of time, it notifies the operator of the heat treatment furnace 10 and the like.

  An operator of the heat treatment furnace 10 cleans the blower 100 based on the notification from the tire cord heat treatment determination computer 150 and removes dust such as a scale attached to the nozzle port 101 and the like.

  FIG. 2A is a plan view schematically showing the blower 100 (including the circulation duct 110) and the feed rollers 30A to 30E installed in the heat treatment furnace 10 shown in FIG. Moreover, FIG.2 (b) is an arrow line view from F2B direction shown to Fig.2 (a).

  As shown in FIG. 2A, the thermocouples 131 to 138 are installed in the vicinity of the end portions of the feed rollers 30A to 30E. Moreover, as shown in FIG.2 (b), the thermocouples 131-138 are installed about every 10 m along the tire cord 20 meandered by the feed rollers 30A-30E. Note that the installation positions of the thermocouples 131 to 138 may be installed not between the ends of the feed rollers 30A to 30E but between the feed rollers, for example.

(Logic block configuration of tire cord heat treatment determination device)
FIG. 3 is a logical block configuration diagram of the tire cord heat treatment determination computer 150 constituting the tire cord heat treatment determination device in the present embodiment.

  As shown in the figure, the tire code heat treatment determination computer 150 includes an atmosphere temperature detection unit 151, an information input unit 153, a tire code temperature estimation unit 155, and a notification unit 157.

  The ambient temperature detector 151 detects the ambient temperature in the heat treatment furnace 10 based on the state of the thermocouples 131 to 138 (temperature measuring devices).

  Specifically, the atmospheric temperature detection unit 151 detects the atmospheric temperature at a plurality of positions in the heat treatment furnace 10 based on the state of the thermocouples 131 to 138, and the data of the detected plurality of atmospheric temperatures is the tire code temperature. It outputs to the estimation part 155.

  The information input unit 153 allows an operator of the heat treatment furnace 10 to input information. The information input unit 153 can also input information from another computer connected to the tire cord heat treatment determination computer 150.

  For example, the information input unit 153 receives the type of the tire cord 20 to be heat-treated in the heat treatment furnace 10, the heat transfer coefficient of the material constituting the tire cord 20, and the like.

  The tire cord temperature estimation unit 155 estimates the temperature of the tire cord 20 based on the ambient temperature at a plurality of positions in the heat treatment furnace 10 output by the ambient temperature detection unit 151.

Specifically, the tire cord temperature estimation unit 155 includes a maximum temperature range including the maximum temperature T _MAX of the tire cord 20 during the heat treatment of the tire cord 20 based on the atmospheric temperature data output by the atmospheric temperature detection unit 151. A holding time P _MAX during which the temperature of the tire cord 20 is held in R _MAX is estimated (see FIG. 5). In the present embodiment, the tire cord temperature estimation unit 155 constitutes a holding time estimation unit.

The tire cord temperature estimation unit 155 obtains the holding time P _MAX of the maximum temperature range R _MAX (for example, 220 to 250 ° C.) by calculation according to the finite element method (FEM) using at least a plurality of atmospheric temperature data. presume.

Further, the tire code temperature estimation unit 155 calculates the retention time P _MAX by adding the type of the tire code 20 input using the information input unit 153 and the heat transfer coefficient of the material constituting the tire code 20. You can also.

  Specifically, in the test environment, hot air W is applied to the tire cord 20 wound around the thermocouple, and the temperature transition of the tire cord 20 is measured. Next, a program for the temperature transition (heat transfer coefficient) of the tire cord 20 is constructed using the FEM.

  In addition, physical properties such as air, specific heat of the tire cord 20, thermal conductivity, density, the structure of the heat treatment furnace 10, the structure of Dip anti, the feed rate of the tire cord 20, the temperature, etc., and the tire measured in the test environment The data of the heat transfer coefficient of the code 20 is provided to the tire code temperature estimation unit 155 that executes the program, and the temperature transition of the tire code 20 is estimated.

Notification unit 157, as if the retention time P _MAX that is determined by the tire cord temperature estimating unit 155 is below a predetermined threshold value (e.g., 45 seconds), the retention time P _MAX is informed that below a predetermined threshold value It is.

Specifically, the notification unit 157 includes an alarm device, and causes the alarm device to ring when the holding time P _MAX falls below a predetermined threshold.

In addition, the notification unit 157 is not limited to an alarm device, but can turn on an alarm lamp or connect another computer via a communication network (not shown) that the holding time P _MAX has fallen below a predetermined threshold. It is also possible to notify devices (including PDAs and mobile phone terminals).

(Operation of tire cord heat treatment determination device)
Next, the operation of the above-described tire cord heat treatment determination computer 150 will be described. FIG. 4 shows an operation flow of the tire cord heat treatment determination computer 150.

  As shown in the figure, in step S10, the tire cord heat treatment determination computer 150 uses the thermocouples 131 to 138 to acquire atmospheric temperature data for a plurality of positions in the heat treatment furnace 10.

In step S <b> 20, the tire cord heat treatment determination computer 150 calculates the temperature of the tire cord 20. As described above, the tire cord heat treatment determination computer 150 has the physical properties such as air, the specific heat of the tire cord 20, the thermal conductivity, the density, the structure of the heat treatment furnace 10, the structure of Dip, the feed speed of the tire cord 20, the temperature, and the like. And the maximum temperature range R _MAX including the maximum temperature T _MAX of the tire cord 20 during the heat treatment of the tire cord 20 (for example, 220 to 220), based on the data of the heat transfer coefficient of the tire cord 20 measured in the test environment 250 ° C.), the holding time P _MAX during which the temperature of the tire cord 20 is held is estimated (see FIG. 5).

  Specifically, the tire cord heat treatment determination computer 150 selects elements (for example, thermocouples 131, 132, and 133) based on the ambient temperatures at a plurality of positions in the heat treatment furnace 10 obtained using the thermocouples 131 to 138. Use to determine the ambient temperature acquired.

Further, the tire cord heat treatment determination computer 150 calculates the retention time P _MAX for each element using the ambient temperature and the heat transfer coefficient of the material constituting the tire cord 20 (which may include the type of the tire cord 20). To do.

In step S30, the tire cord heat treatment determination computer 150 determines whether or not the calculated holding time P _MAX is within an allowable range, that is, the holding time P _MAX is below a predetermined threshold (for example, 45 seconds).

When the holding time P _MAX is within the allowable range (YES in step S30), the tire cord heat treatment determination computer 150 repeats the processing from step S10.

If the holding time P _MAX is not within the allowable range (NO in step S30), the tire cord heat treatment determination computer 150 indicates that the holding time P _MAX is not within the allowable range, that is, the heat treatment furnace 10 is abnormal due to an alarm (or warning lamp). Inform that there is.

  For example, in the graph shown in FIG. 5, the tire cord heat treatment determination computer 150 notifies that there is an abnormality in the heat treatment furnace 10 when the transition of the temperature of the tire cord 20 is indicated by a dotted line.

The operator of the heat treatment furnace 10 that recognizes that the holding time P _MAX is not within the allowable range by the notification in step S40 cleans the blower 100 and removes dust such as a scale attached to the nozzle port 101 and the like.

(Action / Effect)
According to the tire cord heat treatment determination computer 150 described above, the tire cord falls within a maximum temperature range R _MAX including the maximum temperature T _MAX of the tire cord 20 during the heat treatment of the tire cord 20 based on the ambient temperature in the heat treatment furnace 10. A holding time P _MAX at which the temperature of 20 is held is estimated.

In other words, the physical properties of the tire cord 20 (Dip anti) after the heat treatment and the adhesive treatment are determined by the maximum temperature T _MAX of the tire cord 20 that is reached by the heat treatment and the holding time P _MAX. Based on P _MAX , it is possible to determine whether or not the physical properties required for the tire cord 20 (Dip anti) can be secured.

Further, when the holding time P _MAX falls below a predetermined threshold value, the fact is notified, so that the operator of the heat treatment furnace 10 recognizes the optimum cleaning timing of the blower 100 in the heat treatment furnace 10. Can do.

Further, according to the tire cord heat treatment determining computer 150, based on the estimated hold time P _MAX, whether capable of ensuring physical properties required in the tire cord 20 (Dip anti) can be determined. For this reason, it is not necessary to directly check the physical properties of the tire cord 20 after the heat treatment (Dip anti), and it is possible to avoid interruption of the heat treatment of the tire cord 20 due to the confirmation.

(Other embodiments)
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

For example, in the above-described embodiment of the present invention, the temperature of the tire cord 20 is within the maximum temperature range R _MAX including the maximum temperature T _MAX using the heat transfer coefficient of the material constituting the tire cord 20 and the type of the tire cord 20. Although the embodiment to estimate the retention time P _MAX held, furthermore, other data (e.g., transition data of the outside air temperature seasonal and daily) was added and the retention time P _MAX may be estimated. By using the data, it can be more accurately determined whether or not the tire cord 20 (Dip counter) has the required physical properties regardless of the timing of the heat treatment of the tire cord 20.

  In the above-described embodiment of the present invention, the thermocouples 131 to 138 are used as the temperature measuring device for measuring the ambient temperature in the heat treatment furnace 10, but instead of the thermocouple, for example, an infrared thermometer is used. May be. In the above-described embodiment of the present invention, a plurality of thermocouples (temperature measuring devices) are used. However, a plurality of temperature measuring devices are not necessarily used.

Furthermore, in the above-described embodiment of the present invention, the holding time P _MAX is estimated using the finite element method (FEM). However, the finite element method is not necessarily used for estimating the holding time P _MAX. Good.

  Further, the functions of the atmospheric temperature detection unit 151, the information input unit 153, the tire code temperature estimation unit 155, and the notification unit 157 constituting the logical block of the tire code heat treatment determination computer 150 described above are provided by a recording medium such as a CD-ROM. It can also be provided as a program that can be provided via a communication network.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

1 is an overall schematic configuration diagram of a heat treatment furnace including a tire cord heat treatment determination device according to an embodiment of the present invention. It is the figure which showed typically the air blower and the feed roller which are installed in the heat processing furnace which concerns on embodiment of this invention. 1 is a logical block configuration diagram of a tire cord heat treatment determination apparatus according to an embodiment of the present invention. It is an operation | movement flowchart of the tire cord heat processing determination apparatus which concerns on embodiment of this invention. It is a graph which shows the relationship of the maximum temperature of the tire cord which concerns on embodiment of this invention, the maximum temperature range, and holding time.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Heat treatment furnace, 20 ... Tire cord, 30A-30E ... Feed roller, 100 ... Blower, 101 ... Nozzle port, 110 ... Circulation duct, 131-138 ... Thermocouple, 150 ... Tire cord heat treatment judgment computer, 151 ... Atmosphere Temperature detection unit, 153 ... information input unit, 155 ... tire code temperature estimation unit, 157 ... notification unit, R _MAX ... maximum temperature range, T _MAX ... maximum temperature, P _MAX ... holding time, W ... hot air

Claims (6)

A tire cord heat treatment determination device for determining whether a tire cord, which is a twisted fiber cord used for a pneumatic tire, is normally subjected to heat treatment by hot air in a heat treatment furnace,
Based on the state of the temperature measuring device provided in the heat treatment furnace, an atmospheric temperature detection unit that detects the atmospheric temperature in the heat treatment furnace,
Based on the atmospheric temperature detected by the atmospheric temperature detection unit, a holding time during which the tire cord temperature is held in a maximum temperature range including the maximum temperature of the tire cord during heat treatment of the tire cord is estimated. A retention time estimation unit;
A tire cord heat treatment determination apparatus comprising: a notification unit that notifies that the holding time has fallen below a predetermined threshold when the holding time estimated by the holding time estimation unit has fallen below a predetermined threshold. The ambient temperature detector detects a plurality of the ambient temperatures by a plurality of the temperature measuring devices,
The tire cord heat treatment determination device according to claim 1, wherein the holding time estimation unit estimates the holding time by at least a calculation according to a finite element method using a plurality of data of the ambient temperature. A tire cord that is a twisted fiber cord used for a pneumatic tire is a tire cord heat treatment determination method for determining whether heat treatment is normally performed by hot air in a heat treatment furnace,
Detecting an atmospheric temperature in the heat treatment furnace based on a state of a temperature measuring device provided in the heat treatment furnace;
A step of estimating a holding time during which the temperature of the tire cord is held in a maximum temperature range including the maximum temperature of the tire cord during the heat treatment of the tire cord based on the atmospheric temperature detected in the detecting step. When,
And a step of notifying that the holding time is below a predetermined threshold when the holding time estimated in the estimating step is below a predetermined threshold. In the step of detecting the ambient temperature, a plurality of the ambient temperatures are detected by a plurality of the temperature measuring devices,
The tire cord heat treatment determination method according to claim 3, wherein, in the step of estimating the holding time, the holding time is estimated at least by a calculation according to a finite element method using the atmospheric temperature data. A tire cord that is a twisted fiber cord used for a pneumatic tire is a tire cord heat treatment determination program that determines whether heat treatment is normally performed by hot air in a heat treatment furnace,
On the computer,
Based on the state of the temperature measuring device provided in the heat treatment furnace, an atmospheric temperature detection procedure for detecting the atmospheric temperature in the heat treatment furnace,
Based on the atmospheric temperature detected in the atmospheric temperature detection procedure, a holding time during which the temperature of the tire cord is held in a maximum temperature range including the maximum temperature of the tire cord during heat treatment of the tire cord is estimated. A retention time estimation procedure;
A tire cord heat treatment determination program for executing a notification procedure for notifying that the holding time is below a predetermined threshold when the holding time estimated in the holding time estimation procedure is below a predetermined threshold. In the ambient temperature detection procedure, a plurality of the ambient temperatures are detected by a plurality of the temperature measuring devices,
The tire cord heat treatment determination program according to claim 5, wherein in the holding time estimation procedure, the holding time is estimated by at least a calculation according to a finite element method using a plurality of data of the ambient temperature.

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