JP2009137038A - Folding-back bladder monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding-back bladder monitoring system which can early detect the occurrence of abnormality and prevent a failure due to the folding-back defect even when the abnormality occurs in an internal pressure for supplying a bladder or the bladder deteriorates with age. <P>SOLUTION: The folding-back bladder monitoring system 10 is equipped with: a bladder bulge diameter measuring sensor 21 for measuring the bulge diameter of the folding-back in a bulged state; an alarm unit 26 for transmitting an abnormality alarm; and a control part 24 for outputting an alarm transmission command to the alarm unit 26 when the bulge diameter input from the bladder bulge diameter measuring sensor 21 is out of the predetermined normal range. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a system for monitoring the operation of a folded bladder that bulges by supplying an internal pressure and folds a side portion of a carcass ply affixed to a tire molding drum around a bead core.

  Conventionally, in the process of molding a tire, after attaching the carcass ply, both sides of the carcass ply are folded back around the bead core, and are usually folded bladders disposed at both axial ends of the molding drum. Folding is performed by supplying an internal pressure to the inner wall of the carcass ply and deforming the side portion of the carcass ply disposed on the outer peripheral side. At this time, in order to perform constant folding, bulging is performed under the condition that the original pressure of the air supplied to the inside of the folding bladder and the time during which the air is supplied are constant.

  However, in the prior art, even if the original pressure of the air supplied to the inside of the folded bladder and the time during which this air is supplied are constant, there are air leaks and punctures in the folded bladder and its flow path. In this case, the folding shape of the bladder is different, and there is a problem that normal folding cannot be performed. Conventionally, an abnormality is manually detected by detecting an air leak sound. However, with this alone, it is difficult to reliably detect air leaks, and since it is a human detection, the detection is uneven. Further, even when the internal pressure is constant, there is a problem that the shape at the time of swelling changes due to rubber fatigue forming the bladder.

  The present invention has been made in view of such problems, and even when an abnormality occurs in the internal pressure supplied to the bladder or when the bladder changes over time, the occurrence of the abnormality is detected at an early stage, and the folding failure is detected. It is an object of the present invention to provide a folded bladder monitoring system that can prevent a failure caused by the problem.

<1> is a system that monitors the operation of the folded bladder that bulges by supplying an internal pressure and folds the side portion of the carcass ply attached to the tire molding drum around the bead core.
A bladder bulging diameter measuring sensor for measuring the bulging diameter of the folded bladder in the bulging state, an alarm device for transmitting an abnormal alarm, and bulging diameter data input from the bladder bulging diameter measuring sensor are predetermined. And a control unit that outputs a warning transmission command to the alarm device when it is out of the normal range.

  <2> includes a bladder internal pressure measurement sensor for measuring the internal pressure of the folded bladder in <1>, and the control unit causes the internal pressure data input from the bladder internal pressure measurement sensor to be out of a predetermined normal range. In this case, the folded bladder monitoring system is configured to output an alarm transmission command to the alarm device.

  <3> includes an air flow rate measurement sensor for measuring an inflow amount of air supplied as an internal pressure of the folded bladder in <1> or <2>, and the control unit is connected to the air inflow amount measurement sensor. This is a folding bladder monitoring system configured to output an alarm transmission command to the alarm device when the input inflow amount data deviates from a predetermined normal range.

<4> is a system that monitors the operation of the folding bladder that folds the side portion of the carcass ply attached to the tire molding drum around the bead core by bulging due to the supplied internal pressure.
A bladder bulging diameter measuring sensor for measuring the bulging diameter of the folded bladder in the bulging state, an internal pressure control valve for controlling the internal pressure, and bulging diameter data input from the bladder bulging diameter measuring sensor are predetermined. The internal pressure control valve starts the internal pressure control based on the bulge diameter data input from the bladder bulge diameter measurement sensor so that the bulge diameter falls within the normal range when it is outside the normal range. A folding bladder monitoring system comprising a control unit that outputs a control start command and an internal pressure target value in the internal pressure control.

  <5> includes a bladder internal pressure measurement sensor that measures an internal pressure of the folded bladder and an alarm device that transmits an abnormality alarm in <4>, and the control unit receives internal pressure data input from the bladder internal pressure measurement sensor. Is a folded bladder monitoring system configured to prevent the control start command from being output to the internal pressure control valve and to output the alarm transmission command to the alarm device when it is out of a predetermined normal range. .

  <6> includes an air flow rate measurement sensor that measures an inflow amount of air supplied as an internal pressure of the folded bladder in <5>, and the control unit receives inflow amount data input from the air flow rate measurement sensor. The folding bladder monitoring system is configured to prevent the control start command from being output to the internal pressure control valve and to output the alarm transmission command to the alarm device when it deviates from a predetermined normal range.

  <7> is the bulging diameter data input from the bladder bulging diameter measurement sensor to the control unit in <5> or <6>, and the bulging diameter data deviates from the control target range predetermined outside the normal range. In this case, the folded bladder monitoring system is configured so that the control start command is not output to the internal pressure control valve and the alarm transmission command is output to the alarm device.

  <8> is a method according to any one of <1> to <7>, wherein the bladder bulge diameter measuring sensor is irradiated on the outer circumferential surface of the bulged folded bladder and reflected by the change in the light receiving position of the laser beam reflected there. This is a folded bladder monitoring system configured by a laser distance measuring device that identifies the radial position of the outer peripheral surface.

  According to <1>, a bladder bulge diameter measurement sensor that measures the bulge diameter of the folded bladder in the bulged state, an alarm device that issues an abnormal alarm, and a bulge input from the bladder bulge diameter measurement sensor. A control unit that outputs an alarm transmission command to the alarm device when the output diameter data is out of a predetermined normal range, so that the molding operation is interrupted by information from the control unit or information from the alarm device. Thus, the cause of the abnormality can be detected at an early stage, and the folding bladder can be prevented in advance from exhibiting an abnormal bulging shape and causing a folding failure.

  <2> According to <2>, a bladder internal pressure measurement sensor for measuring the internal pressure of the folded bladder is provided, and the controller is operated when internal pressure data input from the bladder internal pressure measurement sensor is out of a predetermined normal range. Since the alarm transmission command is output to the alarm device, the abnormality of the bladder internal pressure can be detected at an early stage, and the cause of the return failure can be removed in advance.

  According to <3>, an air flow rate measurement sensor for measuring an inflow amount of air supplied as an internal pressure of the folded bladder is provided, and the inflow amount data input from the air inflow amount measurement sensor is previously received by the control unit. Since it is configured to output an alarm transmission command to the alarm device when it deviates from the defined normal range, it is possible to detect an abnormality in the inflow amount of air at an early stage and eliminate the cause of the return failure in advance. .

  According to <4>, the bladder bulge diameter measuring sensor that measures the bulge diameter of the folded bladder in the bulged state, the internal pressure control valve that controls the internal pressure, and the bladder bulge diameter measurement sensor are input. Based on the bulging diameter data input from the bladder bulging diameter measurement sensor so that the bulging diameter falls within the normal range when the bulging diameter data deviates from a predetermined normal range, the internal pressure control valve Since it includes a control start command for starting internal pressure control and a control unit that outputs an internal pressure target value in the internal pressure control, even if the bulging shape changes with respect to the same internal pressure due to aging of the folded bladder, the internal pressure is reduced. Since the bulging shape is made constant by controlling, the occurrence of folding failure can be prevented.

  According to <5>, a bladder internal pressure measurement sensor for measuring the internal pressure of the folded bladder and an alarm device for transmitting an abnormality alarm are provided, and the control unit has predetermined internal pressure data input from the bladder internal pressure measurement sensor. The control start command is not output to the internal pressure control valve when it is out of the normal range, and the alarm transmission command is output to the alarm device. Thus, the cause of the return failure can be removed in advance.

  According to <6>, an air flow rate measurement sensor that measures an inflow amount of air supplied as an internal pressure of the folded bladder is provided, and the inflow amount data input from the air flow rate measurement sensor to the control unit is determined in advance. Since the control start command is not output to the internal pressure control valve when it is out of the normal range, and the alarm transmission command is output to the alarm device, an abnormality in the inflow amount of air is detected early. Thus, the cause of the folding failure can be removed in advance.

  According to <7>, when the bulge diameter data input from the bladder bulge diameter measurement sensor deviates from a predetermined control target range outside the normal range, the control unit controls the internal pressure control. Since the control start command is not output to the valve and the alarm transmission command is output to the alarm device, extreme aging of the folding bladder is detected early and the cause of the folding failure is removed in advance. be able to.

  According to <8>, the above-described bladder bulging diameter measuring sensor is a laser that identifies the radial position of the outer circumferential surface by changing the light receiving position of the laser beam irradiated to the outer circumferential surface of the bulged folded bladder and reflected there. Since the distance measuring device is used, a change in the bladder bulge shape can be detected with high accuracy and simple means.

  1 and 2 are partial cross-sectional views showing a folded bladder to be monitored in the folded bladder monitoring system according to the embodiment of the present invention. FIG. 1 shows a state before supplying an internal pressure, and FIG. The pair of folded bladders 1 are respectively attached to side drums 5 provided on both sides of the molding drum 2 in the axial direction, and air flows into the folded bladder 1 from the air inlet / outlet 6 so that the internal pressure is increased. The folding bladder 1 is bulged by increasing the pressure, and the folding bladder 1 is configured to discharge and contract the internal pressure by its self-restoring force by releasing the air inlet / outlet 6 to the atmosphere. In the figure, reference numeral 3 is a bead lock section, reference numeral 4 is a center drum, reference numeral 21 is a folded bladder bulging diameter measuring sensor constituting a part of a bladder monitoring system described later, and reference numeral 22 is a bladder internal pressure. The measurement sensor and reference numeral 23 represent an air flow measurement sensor, respectively.

  In order to mold a tire using such a molding drum 2, first, after winding the inliner 11 around the molding drum 2, the carcass ply 12 is folded on both sides, and at least a part of the outer peripheral surface of the bladder 1 is formed. Then, the bead core 13 and the bead filler 14 are set on the radially outer side of the carcass ply 12. Then, as shown in FIG. 1, the diameter of the bead lock portion 3 is expanded, and the bead core 13 is held by the bead lock portion 3.

  Subsequently, the internal pressure is supplied from the air inlet / outlet 6 to bulge the folded bladder 1 as shown in FIG. 2, but the side portion 12 a of the carcass ply 12 is deformed in accordance with the movement of the folded bladder 1. The side portion 12a of the carcass ply 12 is folded back by the bulging.

  Thereafter, the side portion 12a of the carcass ply 12 is wrapped around the bead core 13 and the bead filler 14 by bringing the cone-shaped slider 7 inward in the axial direction of the molding drum and further folding the bladder 1 inward in the axial direction. Thus, the main body 12b of the carcass ply 12 can be brought into close contact with the main body 12b.

  Here, when the side part 12a of the carcass ply 12 is folded, the side part 12a after the folding is wrinkled, the position thereof is shifted, and the close contact with the main body part 12b is insufficient. In some cases, the folding may be difficult due to a problem. This bulging shape varies depending on the internal pressure, the inflow speed thereof, and further the mechanical characteristics of the folding bladder 1 itself, and these factors do not vary. Thus, the present invention is a system that monitors the bulging shape of the folded bladder and manages it so that it falls within a certain shape range, and its configuration will be described below.

  FIG. 3 is a block diagram showing the folded bladder monitoring system according to the first embodiment of the present invention. The folded bladder monitoring system 10 measures the bladder bulge for measuring the bulging diameter Dx of the folded bladder in the bulged state. An alarm is sent to the alarm device 26 when the bulge diameter data Dx input from the bulge diameter measurement sensor 21, an alarm device 26 for transmitting an abnormality alarm, and the bulge bulge diameter measurement sensor 21 are out of a predetermined normal range. And a control unit 24 that outputs a command. Preferably, in addition to these, a bladder internal pressure measurement sensor 22, an air flow rate measurement sensor 23, and a display unit 25 may be provided.

  The folded bladder monitoring system 10 operates as follows. That is, the bulging diameter of the folded bladder is measured at a timing t1 when a predetermined time has elapsed after the start of air supply to the folded bladder. For example, the timing t1 may be a timing immediately after the folded bladder completes its bulge in the normal state. Further, the measurement point of the outer diameter may be a single point set in the vicinity of the axial position corresponding to the maximum diameter of the folding bladder from the center in the axial direction of the forming drum, or a plurality of points including this, for the axial position, for example. You can also Further, the circumferential position of the measurement point may be a single point in the circumferential direction or a plurality of points including this. Hereinafter, the case where the number of measurement points is one will be described. However, even in the case of a plurality of points, the measurement can be performed in the same manner by statistically handling the measurement values for these points.

  Here, the normal range Dmin to Dmax of the bulging diameter is set in advance, and this can be determined by investigating the range when the normal operation is performed based on the past quality data. Then, this set value is stored in the memory 28 of the control unit 24.

  The control unit 24 inputs the bulging diameter data Dx measured at the timing t1 by the bladder bulging diameter measuring sensor 21, and the CPU 27 reads the normal range limit values Dmin and Dmax from the memory 28, and the bulging diameter. If the data Dx is within the normal range Dmin to Dmax, nothing is output. If this is outside the normal range Dmin to Dmax, the display unit 25 is displayed to that effect and an alarm transmission command is issued to the alarm device 26. Perform output processing. At this time, it is also possible to output a signal to interrupt the molding operation to the device side (not shown) that controls the molding drum.

  Further, when the bladder monitoring system 10 is provided with the bladder internal pressure measurement sensor 22, the normal range Pmin to Pmax of the internal pressure at the predetermined timing t2 is set in advance, and the limit value is stored in the memory 28 of the control unit 24. The bladder internal pressure measurement sensor 22 measures the internal pressure of the bladder at a predetermined timing t2, and the control unit 24 inputs the internal pressure data Px measured at the timing t2 from the bladder internal pressure measurement sensor 22, and the CPU 27 If the limit values Pmin and Pmax of the normal range are read from the memory 28 and the internal pressure data Px is within the normal range Pmin to Pmax, nothing is output, and if this is out of the normal range Pmin to Pmax, this is indicated on the display unit 25. And a process of outputting an alarm transmission command to the alarm device 26 is performed.

  Similarly, when the bladder monitoring system 10 is provided with the air flow rate measurement sensor 23, the normal range Qmin to Qmax of the air flow rate at the predetermined timing t3 is set in advance, and this limit value is stored in the memory 28 of the control unit 24. The air flow rate measurement sensor 23 measures the air flow rate to the bladder at a predetermined timing t3, and the control unit 24 inputs the air flow rate data Qx measured at the timing t3 from the air flow rate measurement sensor 23. At the same time, the CPU 27 reads the normal range limit values Qmin and Qmax from the memory 28, and outputs nothing if the internal pressure data Qx is within the normal range Qmin to Qmax. In addition to displaying the fact on the unit 25, a process of outputting an alarm transmission command to the alarm device 26 is performed.

  If the abnormality of the bladder bulge diameter is a puncture of the folded bladder 1 or an air leak in the pipeline, the internal pressure data Px is out of the normal range and the bladder bulge diameter data Dx is also likely to be out of the normal range. In such a case, after the work for removing the cause is performed, the tire molding operation is continued.

  Thus, by using the bladder monitoring system 10 of the present invention, in the case of a condition that causes a folding failure, this can be detected early and the occurrence thereof can be prevented.

  Similarly, when the air flow rate decreases due to clogging of piping, etc., the air flow measurement data Qx is out of the abnormal normal range, and the bladder bulge diameter measurement data Dx is also likely to be out of the normal range. In this case as well, the occurrence of the folding failure can be prevented in advance by removing the factor causing the folding abnormality.

  In addition, when the internal pressure abnormality and the air flow rate abnormality do not occur but only the measurement data Dx of the bladder bulge diameter is abnormal, it can be considered that the bulge shape has changed due to aging of the folded bladder 1 or the like. Also in this case, for example, by replacing the bladder at an early stage, the occurrence of a return failure can be prevented in advance.

  In this embodiment, the bladder bulge diameter measuring sensor 21 specifies the radial position of the outer circumferential surface by the change in the light receiving position of the laser beam that is irradiated on the outer circumferential surface of the folded folded bladder 1 and reflected there. It is preferable to use a laser distance measuring device, which can be measured in a non-contact manner, which is advantageous in terms of arrangement, and a highly accurate result can be obtained.

  In addition, as the bladder internal pressure measurement sensor 22, for example, a semiconductor pressure sensor using the fact that the electrical resistance changes depending on pressure can be used. What utilizes the change of the differential pressure can be used.

  FIG. 4 is a block diagram showing a folded bladder monitoring system according to the second embodiment of the present invention. The folded bladder monitoring system 20 measures a bladder bulge that measures the bulging diameter Dx of the folded bladder in the bulged state. The control unit 24A includes an output diameter measurement sensor 21, internal pressure control valves 31a and 31b for controlling the internal pressure of the folded bladders 1a and 1b, and a control unit 24A. Based on the bulge diameter data Dx input from the bladder bulge diameter measurement sensor 21 so that the bulge diameter data Dx falls within the normal range Dmin to Dmax when the diameter Dx deviates from the predetermined normal range Dmin to Dmax. Then, a process for outputting to the internal pressure control valves 31a and 31b a control start command for starting control for adjusting the internal pressure and an internal pressure target value Pa in the internal pressure control is performed.

  Here, for the setting of the internal pressure target value Pa, a predetermined value as a function of the bulging diameter data Dx can be used. When feedback control is performed so as to approach the median value Dm), the internal pressure target value Pa is changed in real time according to the bulging diameter data Dx.

  Here, a bladder internal pressure measurement sensor 22 for measuring the internal pressure of the folded bladder and an alarm device 26 for transmitting an abnormality alarm are provided, and the internal pressure data Px input from the bladder internal pressure measurement sensor 22 is determined in advance by the control unit 24A. If it is outside the normal range Pmin to Pmax, the control start command is not output to the internal pressure control valves 31a and 31b, the display unit 25 is displayed to that effect, and an alarm is transmitted to the alarm device 26. It is preferable to configure so as to output a command, and air leaks and punctures of the folding bladders 1a and 1b can be detected early.

  Similarly, in addition to this, an air flow rate measurement sensor 23 for measuring the inflow amount of air supplied as the internal pressure of the folded bladders 1a and 1b is provided, and the control unit 24A receives the inflow amount input from the air flow rate measurement sensor 23. When the data Qx deviates from the predetermined normal range Qmin to Qmax, the control start command is not output to the internal pressure control valves 31a and 31b, and the display unit 25 displays that effect and an alarm is issued. It is preferable to output an alarm transmission command to the device 26, and problems such as clogged pipes can be detected at an early stage.

  In addition, it is determined in advance whether or not to perform the control as described above according to the range of the bulging diameter Dx that has been input, and if a very abnormal bulging diameter Dx that deviates from this range is measured, Instead of performing the internal pressure control, an alarm device 26 is provided instead, and a command for causing the alarm device 26 to issue an alarm is output, and a signal for interrupting the operation is transmitted to the device controlling the tire molding. It is preferable to output.

  The limit values of the normal range are stored in the memory 28, and when the CPU 27 performs the above processing, these limit values are read from the memory 28 as in the case of the first embodiment. .

It is a fragmentary sectional view which shows the folding bladder used as the monitoring object in the folding bladder monitoring system which concerns on embodiment of this invention in the state before supplying an internal pressure. It is a fragmentary sectional view which shows the folding bladder in the state bulged. It is a block diagram which shows the folding bladder monitoring system of the 1st Embodiment of this invention. It is a block diagram which shows the folding bladder monitoring system of the 1st Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b Folding bladder 2 Molding drum 3 Bead lock part 4 Center drum 5 Side drum 6 Air inlet / outlet 10 Folding bladder monitoring system 11 Inliner 12 Carcass ply 12a Carcass ply side part 12b Carcass ply main part 13 Bead core 14 Bead filler 20 Folded bladder monitoring system 21 Folded bladder bulging diameter measurement sensor 22 Bladder internal pressure measurement sensor 23 Air flow measurement sensor 24, 24A Control unit 25 Display unit 26 Alarm unit 27 CPU
28 Memory 31a, 31b Internal pressure control valve

Claims (8)

In a system for monitoring the operation of a folded bladder that bulges by supplying an internal pressure and folds a side portion of a carcass ply attached to a tire molding drum around a bead core,
A bladder bulging diameter measuring sensor for measuring the bulging diameter of the folded bladder in the bulging state, an alarm device for transmitting an abnormal alarm, and bulging diameter data input from the bladder bulging diameter measuring sensor are predetermined. A folded bladder monitoring system comprising: a control unit that outputs an alarm transmission command to the alarm device when it is out of the normal range.   A bladder internal pressure measurement sensor for measuring the internal pressure of the folded bladder is provided, and the control unit is configured to issue an alarm transmission command to the alarm device when internal pressure data input from the bladder internal pressure measurement sensor is out of a predetermined normal range. The folded bladder monitoring system according to claim 1, wherein the folded bladder monitoring system is configured to output the signal.   In addition to providing an air flow measurement sensor that measures the inflow amount of air supplied as the internal pressure of the folded bladder, the inflow amount data input from the air inflow amount measurement sensor is deviated from a predetermined normal range. The folded bladder monitoring system according to claim 1 or 2, wherein an alarm transmission command is output to the alarm device when the alarm occurs. In the system for monitoring the operation of the folded bladder that folds the side portion of the carcass ply attached to the tire molding drum around the bead core by bulging due to the supplied internal pressure,
A bladder bulging diameter measuring sensor for measuring the bulging diameter of the folded bladder in the bulging state, an internal pressure control valve for controlling the internal pressure, and bulging diameter data input from the bladder bulging diameter measuring sensor are predetermined. The internal pressure control valve starts the internal pressure control based on the bulge diameter data input from the bladder bulge diameter measurement sensor so that the bulge diameter falls within the normal range when it is outside the normal range. A folded bladder monitoring system comprising a control unit that outputs a control start command and an internal pressure target value in the internal pressure control.   A bladder internal pressure measurement sensor for measuring the internal pressure of the folded bladder and an alarm device for transmitting an abnormal alarm are provided, and the control unit has internal pressure data input from the bladder internal pressure measurement sensor deviated from a predetermined normal range. 5. The folded bladder monitoring system according to claim 4, wherein the control start command is not output to the internal pressure control valve and the alarm transmission command is output to the alarm device.   When an air flow rate measurement sensor for measuring an inflow amount of air supplied as an internal pressure of the folded bladder is provided, and the control unit detects that the inflow amount data input from the air flow rate measurement sensor is out of a predetermined normal range. 6. The folding bladder monitoring system according to claim 5, wherein the control start command is not output to the internal pressure control valve and an alarm transmission command is output to the alarm device.   When the bulging diameter data input from the bladder bulging diameter measurement sensor is out of the normal control range outside the normal range, the control unit issues the control start command to the internal pressure control valve. 7. The folded bladder monitoring system according to claim 5, wherein the folding bladder monitoring system is configured not to output and to output an alarm transmission command to the alarm device.   The bladder bulging diameter measuring sensor is configured by a laser distance measuring device that identifies the radial position of the outer circumferential surface by changing the light receiving position of the laser beam irradiated to and reflected from the outer circumferential surface of the bulging folded bladder. The folded bladder monitoring system according to any one of claims 1 to 7.

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