JP2006116835A - Rubber weight detection system and weight detection method - Google Patents

Rubber weight detection system and weight detection method Download PDF

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JP2006116835A
JP2006116835A JP2004307652A JP2004307652A JP2006116835A JP 2006116835 A JP2006116835 A JP 2006116835A JP 2004307652 A JP2004307652 A JP 2004307652A JP 2004307652 A JP2004307652 A JP 2004307652A JP 2006116835 A JP2006116835 A JP 2006116835A
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rubber
weight
strip
thin
detecting
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Naoaki Shimada
直明 島田
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To conduct, with easiness and at a low cost, detecting on all tires the used amounts of the slender belt-like rubbers without stopping the tire molding process. <P>SOLUTION: In the rubber molding equipment wherein a slender belt-like rubber N continuously extruded from an injection molding machine 6 is rolled with a pair of roller heads 3, 4 and wound round a tire molding drum 1, there is provided a weight detection system for the above rubber N. This detection system is equipped with a detector 7 of the width of the rubber N, a detector 8 of the gap between the above roller heads, a rotating speed detector 5 of the roller heads, a rubber temperature detector 9 and a controlling section 10. The controlling section 10 calculates and outputs every predetermined time during the tire molding process, the weight of the rubber N that has been used in the molding, from the cross-section of the extruded rubber, the extrusion speed of the rubber and the rubber density at the observed temperature all calculated from the data obtained with the above each means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、射出成形機から連続的に押し出した帯状ゴム(リボンともいう)を成形ドラムで巻き取ってタイヤ成形を行う成形装置又は成形方法において、使用した細帯状のゴムの重量を検知するゴム重量検知システム及び重量検知方法に関する。   The present invention relates to a rubber for detecting the weight of a thin band-shaped rubber used in a molding apparatus or a molding method in which a band-shaped rubber (also referred to as a ribbon) continuously extruded from an injection molding machine is wound with a molding drum to form a tire. The present invention relates to a weight detection system and a weight detection method.

タイヤ成形において、細帯状のゴムをタイヤ成形ドラム上に巻き付け、各種のタイヤ構成部材を成形することが行われているが、タイヤの品質、例えばユニフォーミティを維持する等のために、タイヤの構成部材となるゴムの重量等を精度良く制御して成形することが必要である。
そのため、細帯状のゴムの巻き取りに際して、射出成形機によるゴムの押出し速度及びタイヤ成形ドラムの表面速度を一致させる等の制御が行われている。
In tire molding, it has been practiced to wrap a rubber strip on a tire molding drum to mold various tire components, but in order to maintain tire quality, for example, uniformity, etc. It is necessary to precisely control the weight of the rubber used as a member for molding.
Therefore, at the time of winding the strip-shaped rubber, control such as matching the rubber extrusion speed by the injection molding machine and the surface speed of the tire molding drum is performed.

例えば、射出成形機から射出又は押出される細帯状のゴム(押出物)を張力制御し、その量及び形状を精度良く維持しながらタイヤ成形ドラムに巻付けるために、細帯状のゴムのたるみ変位データを検出して、予め設定した目標変位データと比較して変位データの誤差値を算出し、この誤差値から、射出成形機の射出速度、射出容量及び射出サイクルの条件により演算定数を選定してタイヤ成形ドラム回転速度を設定し、その回転速度を制御することで、タイヤ成形ドラムの表面速度と射出成形機の射出速度を常に一致させるように同期制御し、精度よくタイヤ成形ドラムに巻き付けるようにしたものが知られている(特許文献1参照)。   For example, to control the tension of a strip-shaped rubber (extruded product) injected or extruded from an injection molding machine and wind it around a tire molding drum while maintaining its amount and shape with high accuracy, the slack displacement of the strip-shaped rubber The data is detected, and the error value of the displacement data is calculated by comparing with the preset target displacement data. From this error value, the calculation constant is selected according to the injection speed, injection capacity and injection cycle conditions of the injection molding machine. By setting the tire molding drum rotation speed and controlling the rotation speed, the tire molding drum surface speed and the injection speed of the injection molding machine are synchronously controlled so that they always coincide, and the tire molding drum is wound with high accuracy. What was made is known (refer patent document 1).

また、射出成形機から押出される細帯状のゴムをタイヤ成形ドラムに巻き付ける際に、細帯状のゴム(帯状ゴム)の幅の変動を抑制し、細帯状のゴムの形状及び重量を均一化して精度良く巻き付けるため、射出機のヘッド部に細帯状のゴムの弛み量を検出する弛み検出器を、また射出成形機の吐出口と前記タイヤ成形ドラムとの間に幅検出器を配置して射出成形機から押出された細帯状のゴムの弛み量と幅とを計測し、制御部で計測された弛み量から得た射出速度と、幅検出器で計測された細帯状のゴムの幅の変化とに応じてドラム巻き付け速度を調整するよう制御するものも知られている(特許文献2)。   In addition, when winding the strip-shaped rubber extruded from the injection molding machine around the tire molding drum, fluctuations in the width of the strip-shaped rubber (strip-shaped rubber) are suppressed, and the shape and weight of the strip-shaped rubber are made uniform. In order to wind with high precision, a slack detector that detects the slack amount of the rubber band in the head of the injection machine, and a width detector between the discharge port of the injection molding machine and the tire molding drum are used for injection. The slack amount and width of the strip-shaped rubber extruded from the molding machine are measured. The injection speed obtained from the slack amount measured by the control unit and the change in the width of the strip-shaped rubber measured by the width detector. There is also known one that controls the drum winding speed to be adjusted in accordance with (Patent Document 2).

しかしながら、これらの従来技術は、帯状ゴム(細帯状のゴム)を安定してタイヤ成形ドラムに巻き付けるための制御を行うだけで、巻き付けゴムの量(重量)が常に一定になるように制御するものではないから、上記制御をいくら精緻に実施しても、製品タイヤにおいて細帯状のゴム重量が常に一定であることを保証するものではない。
ところで、タイヤ成形ドラムに射出成形機から押し出されたゴムを巻き付けてタイヤを成形する方法では、多種類のゴムを各部位に分けて巻き付けるため、個々の部材の重量管理は容易ではなく、とくに成形ドラムに巻き付けた細帯状のゴムの重量をオンライン(製造ライン上)で測定するのは困難である。そのため、タイヤに使用した細帯状のゴムの重量を測定しようとすれば、一旦タイヤをドラムから取り外して測定を行うことが必要であり、量産ラインで全数についてこのような測定を行うのは事実上不可能である。
However, these conventional technologies control the amount (weight) of the wrapping rubber to be always constant only by performing control for stably wrapping the strip rubber (thin strip rubber) around the tire molding drum. Therefore, no matter how finely the above control is performed, it does not guarantee that the weight of the rubber band in the product tire is always constant.
By the way, in the method of forming a tire by wrapping rubber extruded from an injection molding machine around a tire forming drum, since various types of rubber are wound separately in each part, weight management of individual members is not easy, especially molding. It is difficult to measure the weight of the strip-shaped rubber wound around the drum online (on the production line). For this reason, if we want to measure the weight of the rubber strips used in tires, it is necessary to remove the tires from the drum and perform measurements. Impossible.

そこで、ドラム本体にロードセルなどを取り付け、細帯状のゴムの重量を実測する方法を採用することも考えられないわけではないが、機械部品と比較して細帯状のゴムの重量は僅かであり、精度よく測定できないだけではなく、それを行うためにはドラム本体の構造も複雑になり、コスト高になってしまうという問題がある。   Therefore, it is not unthinkable to attach a load cell to the drum body and measure the weight of the rubber strip, but the weight of the rubber strip is small compared to mechanical parts, In addition to being unable to measure accurately, there is a problem that the structure of the drum body becomes complicated and the cost becomes high in order to do so.

このように、従来はオンラインでの巻き付けゴム重量の測定は不可能であり、他方、ドラムを取り外して測定する方法では、一旦取り外したドラムは、以降の工程には戻せないため、得られるデータはそのロットのサンプルデータにしか過ぎず、全数測定は不可能であるため、タイヤ全数についてその使用細帯状のゴムの重量を保証することは不可能であった。   In this way, it is impossible to measure the weight of the wrapping rubber on-line conventionally. On the other hand, in the method of removing the drum and measuring it, the once removed drum cannot be returned to the subsequent process, so the data obtained is Since it is only sample data of the lot and it is impossible to measure all the tires, it is impossible to guarantee the weight of the rubber band used for all the tires.

特開2002−103477号公報JP 2002-103477 A 特開2004−90301号公報JP 2004-90301 A

本発明は、以上の従来の問題に鑑みなされたものであって、その目的は、量産ラインでタイヤ成形ドラムに帯状のゴムを巻き付けて成形する際に、タイヤをドラムから外すことなく細帯状のゴム重量をオンライン(製造ライン)上で容易且つ正確に、しかも全数測定できるようにすることである。   The present invention has been made in view of the above-described conventional problems. The purpose of the present invention is to squeeze a belt-shaped rubber around a tire molding drum in a mass production line without molding the tire from the drum. The rubber weight should be easily and accurately measured on-line (manufacturing line).

請求項1の発明は、射出成形機から押出された細帯状のゴムを一対のローラヘッドで圧延してタイヤ成形ドラムに巻き付けるタイヤ成形装置で使用するゴム重量検知システムであって、圧延後のゴム幅を計測するゴム幅検出手段、前記ローラヘッド間の間隔を計測する間隔検出手段、ゴムの温度検出手段及び、前記ゴムの押出速度を算出し、かつ、該押出速度、前記ゴムの幅、測定温度におけるゴム密度及び押し出し時間に基づき、成形に使用した前記ゴム重量を算出する演算手段を有することを特徴とする。
請求項2の発明は、請求項1に記載された前記細帯状のゴムの重量検知システムにおいて、前記演算手段が前記一対のローラヘッド間の間隔、細帯状のゴムの幅、及び前記ローラヘッドの形状により決定される形状に基づき細帯状のゴムの断面積を算出することを特徴とする。
請求項3の発明は、請求項1又は2に記載された前記細帯状のゴムの重量検知システムにおいて、前記演算手段は、前記一対のローラヘッドの一方の回転数を該ローラヘッド間の平均間隔の補正を加えて前記ゴムの押出速度を算出することを特徴とする。
請求項4の発明は、射出成形機から押出された細帯状のゴムを一対のローラヘッドで圧延した後に、タイヤ成形ドラムに巻き付ける前記細帯状のゴムの成形工程において前記ゴムの重量を検知する方法であって、圧延後のローラヘッド上の前記ゴム幅、前記ローラヘッド間の間隔、前記ゴムの温度を測定する工程、前記ゴムの押出速度を算出する工程、測定された前記ゴム幅、ローラヘッド間の間隔、及び前記一対のローラヘッドで形成される間隙の形状に基づき前記ゴムの断面積を算出する工程、前記ゴムの測定温度に応じたゴム密度を得る工程、得られた前記ゴムの押出速度、断面積、ゴム密度及び押し出し時間に基づき成形に使用したゴム重量を算出する工程を有することを特徴とする。
請求項5の発明は、請求項4に記載された細帯状のゴムの重量検知方法を、前記タイヤ成形工程中所定時間毎に実行することを特徴とする。
請求項6の発明は、請求項4に記載された細帯状のゴムの重量検知方法を、前記タイヤ成形工程中連続的に実行することを特徴とする。
The invention of claim 1 is a rubber weight detection system for use in a tire molding apparatus that rolls a strip-shaped rubber extruded from an injection molding machine with a pair of roller heads and winds it on a tire molding drum, and the rubber after rolling Rubber width detection means for measuring the width, interval detection means for measuring the interval between the roller heads, rubber temperature detection means, and the extrusion speed of the rubber are calculated, and the extrusion speed, the width of the rubber, and the measurement It has an operation means for calculating the weight of the rubber used for molding based on the rubber density at temperature and the extrusion time.
According to a second aspect of the present invention, in the weight detection system for the thin strip-shaped rubber according to the first aspect, the calculation means includes a distance between the pair of roller heads, a width of the thin strip-shaped rubber, and a width of the roller head. The cross-sectional area of the rubber strip is calculated based on the shape determined by the shape.
According to a third aspect of the present invention, in the weight detection system for the strip-like rubber according to the first or second aspect, the calculation means calculates the rotation speed of one of the pair of roller heads as an average interval between the roller heads. The rubber extrusion speed is calculated with the above correction added.
According to a fourth aspect of the present invention, there is provided a method for detecting the weight of the rubber in the step of forming the strip-shaped rubber wound around a tire molding drum after rolling the strip-shaped rubber extruded from the injection molding machine with a pair of roller heads. The step of measuring the rubber width on the roller head after rolling, the interval between the roller heads, the temperature of the rubber, the step of calculating the extrusion speed of the rubber, the measured rubber width, and the roller head A step of calculating a cross-sectional area of the rubber based on a distance between the gaps and a shape of a gap formed by the pair of roller heads, a step of obtaining a rubber density according to a measured temperature of the rubber, and extrusion of the obtained rubber It has the process of calculating the weight of rubber used for molding based on speed, cross-sectional area, rubber density and extrusion time.
The invention of claim 5 is characterized in that the method for detecting the weight of the thin rubber band according to claim 4 is executed at predetermined time intervals during the tire forming process.
The invention of claim 6 is characterized in that the method for detecting the weight of the thin rubber band described in claim 4 is continuously executed during the tire forming step.

(作用)
射出成形機から連続的に押し出した帯状ゴム(リボン)を上下のローラで圧延した後に、タイヤ成形ドラムに巻き付けるタイヤ成形工程において、細帯状のゴムの給送速度、幅、断面積を算出又は測定して、これと細帯状のゴムの温度に応じた密度からタイヤ成形ドラムに巻き取られる細帯状のゴムの総重量を求める。
この細帯状のゴムの総重量を求めるため、前記ローラヘッドのギャップ、ローラヘッドの回転数、ローラヘッド上の細帯状のゴム幅、押し出しゴムの温度データ、当該温度におけるゴムの密度を、所定の演算周期毎にサンプリングし、それらに基づきゴム押出し速度を算出し、細帯状のゴムの重量を得る。これをタイヤ成形工程中全てのタイヤについて、所定時間毎に或いは実質的に連続して行うことで全てのタイヤにおける細帯状のゴム重量の検知をリアルタイムで行う。
(Function)
Calculate or measure the feeding speed, width, and cross-sectional area of the rubber strip in the tire molding process after rolling the rubber strip (ribbon) continuously extruded from the injection molding machine with the upper and lower rollers and winding it around the tire molding drum. Then, the total weight of the strip-shaped rubber wound on the tire molding drum is obtained from the density corresponding to the temperature of the strip-shaped rubber.
In order to obtain the total weight of the rubber strip, the gap between the roller head, the rotation speed of the roller head, the width of the rubber strip on the roller head, the temperature data of the extruded rubber, the density of the rubber at the temperature Sampling is performed at every calculation cycle, and the rubber extrusion speed is calculated based on the sampling to obtain the weight of the rubber strip. This is performed for all tires during the tire molding process at predetermined time intervals or substantially continuously, thereby detecting the weight of the rubber band in all tires in real time.

本発明によれば、細帯状のゴムをオンラインで容易に重量検知ができるようにしたため、抜き取り検査が不要であるばかりではなく、生産効率も低下しないという効果がある。また、全数測定可能であるため、各巻き付け部材の重量保証が可能であり、例えばユニフォーミティ等、品質が良好なタイヤを安定して提供することができる。   According to the present invention, since the weight of the strip-like rubber can be easily detected on-line, not only the sampling inspection is unnecessary, but also the production efficiency is not lowered. In addition, since the total number can be measured, it is possible to guarantee the weight of each winding member, and it is possible to stably provide tires with good quality such as uniformity.

本発明の細帯状のゴム重量検知方法及び検知システムの実施形態について、添付図面を参照して説明する。
図1は、本発明の細帯状のゴム重量の測定を行うための検知システムを概略的に示した図である。
本検知システムは、タイヤ成形ドラム1と、タイヤ成形ドラム1の回転軸2の回転数を検出するドラム回転数検出器2aと、射出成形機6の口金(ノズル)6aから押し出されたゴム細帯状のゴムNを圧延すると共に、タイヤ成形ドラム1の表面に導く一対のローラヘッド即ち上ローラヘッド3及び下ローラヘッド4と、下ローラヘッド4の回転数を検出する下ローラヘッド回転検出器5と、射出成形機6の口金6aとタイヤ成形ドラム1との間に配置され、口金6から押し出された細帯状のゴムNの幅を検出する幅検出器7と、上下のローラヘッド3,4間の間隔(空隙の幅)を検出するローラヘッドギャップ検出器8と、射出成形機の口金6のところのゴムの温度を検出するゴム温度計9と、各検出データに基づき押し出しゴム量を演算し、かつ射出成形機6の射出速度やタイヤ成形ドラム1の回転速度制御等を行う制御部10とからなっている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a thin band-like rubber weight detection method and detection system according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a view schematically showing a detection system for measuring the weight of a thin rubber band according to the present invention.
This detection system includes a tire molding drum 1, a drum rotation number detector 2 a that detects the rotation number of the rotating shaft 2 of the tire molding drum 1, and a rubber strip shaped extruded from a base (nozzle) 6 a of an injection molding machine 6. A pair of roller heads, that is, an upper roller head 3 and a lower roller head 4, and a lower roller head rotation detector 5 that detects the number of rotations of the lower roller head 4. The width detector 7 is disposed between the die 6a of the injection molding machine 6 and the tire molding drum 1 and detects the width of the rubber band N extruded from the die 6, and between the upper and lower roller heads 3 and 4. Roller head gap detector 8 for detecting the gap (gap width), rubber thermometer 9 for detecting the temperature of rubber at the die 6 of the injection molding machine, and calculating the amount of extruded rubber based on each detection data And it has a control unit 10 for performing rotational speed control of the injection speed and the tire building drum 1 of the injection molding machine 6.

ここで、制御部10は、演算等の処理を行うCPU及び記憶装置、演算処理やタイヤ成形機1、射出成形機6等の動作制御を行うプログラム等を格納したROM、演算処理や動作制御のためデータ等の記憶を行うRAMからなる記憶装置(図示せず)を備えており、RAMには、例えば細帯状のゴムを構成するゴム材料の各温度における密度を記録したゴム材料密度テーブル等が設けられている。   Here, the control unit 10 includes a CPU and a storage device that perform processing such as computation, a ROM that stores a program that performs computation processing and operation control of the tire molding machine 1, the injection molding machine 6, and the like, arithmetic processing and operation control. Therefore, a storage device (not shown) including a RAM for storing data and the like is provided, and the RAM includes, for example, a rubber material density table that records the density at each temperature of the rubber material constituting the rubber strip. Is provided.

以上の構成において、前記制御部10は、設定値に応じて細帯状のゴムの押出し速度を制御すると共に、タイヤ成形ドラム1の表面速度をこれに一致させるよう制御する。また、同時に、射出成形機6をこのドラム回転速度に同期してタイヤ成形ドラム1の幅方向に往復移動するように制御する。
これらの制御により、射出成形機6から押し出された帯状ゴム材料は、上ローラヘッド3と下ローラヘッド4で細帯状のゴムNに圧延された後、タイヤ成形ドラム1に巻き付けられる。
In the above-described configuration, the control unit 10 controls the extrusion speed of the rubber strip in accordance with the set value, and controls the surface speed of the tire molding drum 1 to match this. At the same time, the injection molding machine 6 is controlled to reciprocate in the width direction of the tire molding drum 1 in synchronization with the drum rotation speed.
By these controls, the belt-shaped rubber material extruded from the injection molding machine 6 is rolled into the thin belt-shaped rubber N by the upper roller head 3 and the lower roller head 4 and then wound around the tire molding drum 1.

本実施形態では、射出成形機6の口金6aから帯状ゴムを押し出し、上下ローラヘッド3、4で圧延した細帯状のゴムNをタイヤ成形ドラム1の表面上に巻き付ける際、ローラヘッドギャップ検出装置8にてローラーヘッド3、4の間隔A(mm)を測定し、同様に下ローラヘッド回転数検出器5で下ローラヘッド4の回転数Rrpmを、細帯状のゴム幅検出器(測定装置)7でゴム幅Wを、更に、ゴム温度計9で射出成形機6の口金6aのところのゴムの温度を検出又は測定し、それぞれの検出又は測定データは、所定時間Δt毎に制御部10から前記各測定又は検出器等に順次送信される送信要求信号に応じて制御部10に送信される。   In the present embodiment, when a rubber band is extruded from the die 6a of the injection molding machine 6 and the thin rubber band N rolled by the upper and lower roller heads 3 and 4 is wound on the surface of the tire molding drum 1, the roller head gap detecting device 8 is used. , The distance A (mm) between the roller heads 3 and 4 is measured. Similarly, the lower roller head rotational speed detector 5 determines the rotational speed Rrpm of the lower roller head 4 and the narrow rubber width detector (measuring device) 7. The rubber width W and the rubber temperature at the base 6a of the injection molding machine 6 are detected or measured by the rubber thermometer 9, and the detected or measured data is read from the control unit 10 every predetermined time Δt. It is transmitted to the control unit 10 in response to a transmission request signal sequentially transmitted to each measurement or detector.

制御部10は、細帯状のゴム幅Wと、検出されたローラヘッドの間隔A(mm)とローラヘッド形状により決定される断面形状に基づき前記細帯状のゴムの平均厚みを算出し、これらのデータに基き押し出された細帯状のゴムの断面積Sを算出する。
また、制御部10は下ローラヘッド4の回転数Rrpmに、前記ローラヘッドの間の平均間隔即ち細帯状のゴムの平均厚みの補正を入れたゴム押出速度Vを算出し、かつ、前記測定されたゴム温度より、記憶装置のテーブルから当該温度におけるゴム密度ρ(g/mm)を読み出す。なお、ゴム押出速度Vを算出するに当たり、ゴム押出速度Vに与えるゴムの平均厚みの影響を考慮した前記補正は、例えば、実験により演算定数を求め演算時にこれを用いることで行う。
The control unit 10 calculates the average thickness of the rubber strips based on the rubber width W of the thin belts, the cross-sectional shape determined by the detected roller head interval A (mm) and the roller head shape, Based on the data, the cross-sectional area S of the extruded rubber strip is calculated.
Further, the control unit 10 calculates the rubber extrusion speed V obtained by correcting the rotation speed Rrpm of the lower roller head 4 and correcting the average distance between the roller heads, that is, the average thickness of the strip-shaped rubber, and the measurement is performed. From the rubber temperature, the rubber density ρ (g / mm 3 ) at the temperature is read from the table of the storage device. In calculating the rubber extrusion speed V, the correction considering the influence of the average thickness of the rubber on the rubber extrusion speed V is performed, for example, by calculating a calculation constant by experiment and using it during the calculation.

図2は、押し出された細帯状のゴムNの断面積の計算例を示す図である。
即ち、この実施形態では、細帯状のゴムNは、上下のローラヘッド間の間隔Aと等しい最大厚さと幅Wを備えており、かつ前記ローラヘッド形状により決定される断面形状は、図示のように、細帯状のゴムの断面において両端に向かって間隔を減じる方向にテーパーが付された形状になっている。制御部10はこれらのデータに基づき、ローラヘッド間の平均間隔つまり細帯状のゴムの平均厚みを算出し、更に細帯状のゴムNの断面積を算出する。
FIG. 2 is a diagram showing a calculation example of the cross-sectional area of the extruded rubber band N.
That is, in this embodiment, the thin rubber N has a maximum thickness and a width W equal to the distance A between the upper and lower roller heads, and the sectional shape determined by the roller head shape is as shown in the figure. In addition, in the cross section of the rubber strip, the shape is tapered in the direction of decreasing the distance toward both ends. Based on these data, the control unit 10 calculates the average interval between the roller heads, that is, the average thickness of the strip-shaped rubber, and further calculates the cross-sectional area of the strip-shaped rubber N.

制御部10は、所定時間Δt毎に各検出器をスキャンする、即ち各検出器に所定時間間隔Δt毎に測定又は検知データ送信要求信号を送信して各検知手段からの検知データを集め、それらに基づきゴム押し出し速度V、細帯状のゴムの断面積Sを算出し、かつメモリ手段のテーブルから現在温度における細帯状のゴムの密度ρを読み出して、成形中に単位時間当たりに押し出される帯状ゴムの重量(ゴム重量G=V×S×ρ)を求め、これから所定時間(Δt)当たりの細帯状のゴム重量G・Δtを算出する。   The control unit 10 scans each detector every predetermined time Δt, that is, sends a measurement or detection data transmission request signal to each detector at every predetermined time interval Δt, and collects detection data from each detection means. Based on the above, the rubber extrusion speed V, the cross-sectional area S of the rubber strip are calculated, the density ρ of the rubber strip at the current temperature is read from the table of the memory means, and the rubber strip extruded per unit time during molding (Rubber weight G = V × S × ρ) is obtained, and a thin rubber weight G · Δt per predetermined time (Δt) is calculated therefrom.

図3は、縦軸に各スキャン時における細帯状のゴム重量を、また、横軸にスキャン時間間隔Δtをとり、各スキャン時t1、t2・・・tnにおけるゴム押し出し重量G1、G2、・・・Gnが次のスキャン時までのΔt時間継続するとして算出したときの細帯状のゴム重量を示している。
ここで、時間t1から時間tnまでに使用された細帯状のゴム総重量ΣGは次式で表される。
ΣG=(G1+G2+・・・Gn)Δt、
In FIG. 3, the vertical axis indicates the weight of the rubber band in each scan, the horizontal axis indicates the scan time interval Δt, and the rubber extrusion weights G1, G2,... Tn at each scan t1, t2,. -It shows the rubber weight of the thin band when Gn is calculated as continuing Δt time until the next scanning.
Here, the thin rubber-like total weight ΣG used from time t1 to time tn is expressed by the following equation.
ΣG = (G1 + G2 +... Gn) Δt,

タイヤの成形工程では、多種類のゴムを部位に分けて巻き付けるため個々の巻き付けゴムの重量管理は煩雑であるが、本発明によれば、タイヤ成形ドラム状に巻き付けられるゴムの重量を、巻き付け工程を実施しながら同時に容易かつ精度よく検知できる。具体的には、ローラヘッドのギャップ、ローラヘッドの回転数、ローラヘッド上の細帯状のゴム幅、押し出しゴムの温度データを、所定の演算周期毎にサンプリングし、それに基づき温度補正を施して演算を行い細帯状のゴムの重量を得ることができるから、細帯状のゴムの重量管理が容易であり高品質のタイヤを安定的に提供することができる。   In the tire molding process, the weight management of the individual rubber wrapping rubbers is complicated because many types of rubbers are wound in parts, but according to the present invention, the weight of the rubber wound around the tire molding drum is Can be detected easily and accurately at the same time. Specifically, the temperature data of the roller head gap, the number of rotations of the roller head, the band-like rubber width on the roller head, and the temperature of the extruded rubber are sampled at a predetermined calculation cycle, and the temperature correction is performed based on the sampling data. Thus, the weight of the strip-shaped rubber can be obtained, and the weight management of the strip-shaped rubber is easy, and a high-quality tire can be stably provided.

なお、以上の説明において、Δtを極短い時間に設定すれば、制御部10は事実上連続的にその時点までの細帯状のゴム重量を演算出力することができる。
例えば、制御部10は、巻き付け開始からその時点までの細帯状のゴム重量を常に監視することができる他、図示しない表示装置に表示することもできる。
また、制御部10は、細帯状のゴムの重量と予め設定した設定値とを絶えず比較することも可能であり、比較の結果その差が所定の範囲から逸脱したときには、タイヤ成形ドラムの回転数を増減するように制御する。或いは射出成形機の射出速度等を変更する等の制御を行い、細帯状のゴムの重量を設定値に戻す制御を行うよう構成することもできる。制御部は、これらの制御を従来周知の制御技術に基づき適宜なし得ることができる。
In the above description, if Δt is set to an extremely short time, the control unit 10 can calculate and output the weight of the thin rubber band up to that point in practice.
For example, the control unit 10 can always monitor the weight of the thin rubber band from the start of winding to that point, and can also display the weight on a display device (not shown).
Further, the control unit 10 can also constantly compare the weight of the rubber band with a preset set value, and when the difference deviates from a predetermined range as a result of the comparison, the rotation speed of the tire forming drum Control to increase or decrease. Alternatively, control such as changing the injection speed or the like of the injection molding machine can be performed, and control can be performed to return the weight of the thin rubber band to the set value. The control unit can appropriately perform these controls based on conventionally known control techniques.

本発明の実施形態に係る射出成形機を備えた細帯状のゴム重量検知システムを概略的に示す図である。It is a figure which shows roughly the thin strip | belt-shaped rubber | gum weight detection system provided with the injection molding machine which concerns on embodiment of this invention. 細帯状のゴム断面積の計算例を説明するための図である。It is a figure for demonstrating the example of calculation of rubber | gum cross-sectional area of a strip | belt shape. 成形工程中所定時間に使用した細帯状のゴム重量を各サンプリング時毎に示す図である。It is a figure which shows the thin rubber | gum-like rubber weight used for the predetermined time during a shaping | molding process for every sampling time.

符号の説明Explanation of symbols

1・・・タイヤ成形ドラム、2・・・タイヤ成形ドラムの回転軸、2a・・・タイヤ成形ドラムの回転数検出器、3・・・上ローラヘッド、4・・・下ローラヘッド、5・・・下ローラヘッドの回転数検出器、6・・・射出成形機、6a・・・口金、7・・・細帯状のゴム幅検出器、8・・・ローラヘッド間のギャップ(間隔)検出器、9・・・温度検出器、10・・・制御部。   DESCRIPTION OF SYMBOLS 1 ... Tire forming drum, 2 ... Rotating shaft of tire forming drum, 2a ... Revolution detector of tire forming drum, 3 ... Upper roller head, 4 ... Lower roller head, 5. ..Rotational speed detector of lower roller head, 6 ... injection molding machine, 6a ... cap, 7 ... rubber width detector, 8 ... detect gap (interval) between roller heads , 9 ... temperature detector, 10 ... control unit.

Claims (6)

射出成形機から押出された細帯状のゴムを一対のローラヘッドで圧延してタイヤ成形ドラムに巻き付けるタイヤ成形装置で使用するゴム重量検知システムであって、
圧延後のゴム幅を計測するゴム幅検出手段、前記ローラヘッド間の間隔を計測する間隔検出手段、ゴムの温度検出手段及び、前記ゴムの押出速度及び断面積を算出し、かつ、該押出速度、前記断面積、測定温度におけるゴム密度及び押し出し時間に基づき、成形に使用した前記ゴム重量を算出する演算手段を有することを特徴とする前記細帯状のゴムの重量検知システム。
A rubber weight detection system that is used in a tire molding apparatus that rolls a strip of rubber extruded from an injection molding machine with a pair of roller heads and winds the rubber on a tire molding drum,
Rubber width detecting means for measuring the rubber width after rolling, interval detecting means for measuring the interval between the roller heads, rubber temperature detecting means, and calculating the extrusion speed and cross-sectional area of the rubber, and the extrusion speed And a weight detecting system for the thin rubber strip, comprising a calculating means for calculating the weight of the rubber used for molding based on the cross-sectional area, the rubber density at the measurement temperature and the extrusion time.
請求項1に記載された前記細帯状のゴムの重量検知システムにおいて、
前記演算手段が前記一対のローラヘッド間の間隔、細帯状のゴムの幅、及び前記ローラヘッドの形状により決定される形状に基づき細帯状のゴムの断面積を算出することを特徴とする前記細帯状のゴムの重量検知システム。
The weight detection system for the thin rubber band according to claim 1,
The calculation means calculates the cross-sectional area of the thin rubber band based on a distance determined by the distance between the pair of roller heads, the width of the thin rubber band, and the shape of the roller head. A belt-like rubber weight detection system.
請求項1又は2に記載された前記細帯状のゴムの重量検知システムにおいて、
前記演算手段は、前記一対のローラヘッドの一方の回転数を該ローラヘッド間の平均間隔の補正を加えて前記ゴムの押出速度を算出することを特徴とするゴムの重量検知システム。
In the weight detection system for the thin rubber band according to claim 1 or 2,
The rubber weight detection system according to claim 1, wherein the calculating means calculates the rubber extrusion speed by correcting the average number of rotations of one of the pair of roller heads.
射出成形機から押出された細帯状のゴムを一対のローラヘッドで圧延した後に、タイヤ成形ドラムに巻き付ける前記細帯状のゴムの成形工程において前記ゴムの重量を検知する方法であって、
圧延後のローラヘッド上の前記ゴム幅、前記ローラヘッド間の間隔、前記ゴムの温度を測定する工程、前記ゴムの押出速度を算出する工程、測定された前記ゴム幅、ローラヘッド間の間隔、及び前記一対のローラヘッドで形成される間隙の形状に基づき前記ゴムの断面積を算出する工程、前記ゴムの測定温度に応じたゴム密度を得る工程、得られた前記ゴムの押出速度、断面積、ゴム密度及び押し出し時間に基づき成形に使用したゴム重量を算出する工程、を有することを特徴とする前記細帯状のゴムの重量検知方法。
A method of detecting the weight of the rubber in the step of forming the strip-shaped rubber wound around a tire molding drum after rolling the strip-shaped rubber extruded from an injection molding machine with a pair of roller heads,
The rubber width on the roller head after rolling, the interval between the roller heads, the step of measuring the temperature of the rubber, the step of calculating the extrusion speed of the rubber, the measured rubber width, the interval between the roller heads, And a step of calculating a cross-sectional area of the rubber based on a shape of a gap formed by the pair of roller heads, a step of obtaining a rubber density according to a measurement temperature of the rubber, an extrusion speed of the obtained rubber, and a cross-sectional area And a step of calculating the weight of the rubber used for molding based on the rubber density and the extrusion time.
請求項4に記載された細帯状のゴムの重量検知方法を、前記タイヤ成形工程中所定時間毎に実行することを特徴とする前記細帯状のゴムの重量検知方法。   5. A method for detecting the weight of a thin rubber strip according to claim 4, wherein the method for detecting the weight of the thin rubber strip is executed every predetermined time during the tire molding step. 請求項4に記載された細帯状のゴムの重量検知方法を、前記タイヤ成形工程中連続的に実行することを特徴とする前記細帯状のゴムの重量検知方法。   The method for detecting the weight of a thin rubber strip according to claim 4, wherein the method for detecting the weight of the thin rubber strip is continuously performed during the tire forming step.
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