WO2019245051A1 - Tire leak detecting method, and tire leak detecting device - Google Patents

Abstract

This tire leak detecting method includes: a step of hermetically sealing an inner chamber of a tire using a hermetic sealing means, and accommodating an inner bag in the hermetically sealed inner chamber; a step of supplying air to the inner bag from an air supply means to expand the same, and supplying inspection gas into the inner chamber, between the inner bag and the tire, from an inspection gas supply means; and a step of detecting a leak of inspection gas from the tire by means of a detector provided outside the tire.

Description

Tire leak detection method and tire leak detection device

The present disclosure relates to a tire leak detecting method and a tire leak detecting device for detecting a leak of a test gas supplied to an inner chamber of a tire.

As a conventional leak detection method, for example, a method described in Japanese Patent Application Laid-Open No. 2000-501833 is known.

In this method, a test gas (helium / air mixture) is supplied to a sealed inner chamber formed between an upper plate, a lower plate, a bowl portion and a wheel, while the inner chamber of the wheel is suctioned by a pump. At this time, the mass spectrometer leak detector detects whether the test gas leaks from between the upper plate, the lower plate, the bowl-shaped portion and the wheel. This method can be easily applied to a tire leak test by replacing the above-described upper plate, lower plate, and bowl-shaped portion with a tire.

Here, it is conceivable to collect the inspection gas from the inner chamber of the tire after the above-described leakage inspection is completed, and use the collected inspection gas again for the next leakage inspection. However, in this case, the test gas is supplied to the inner chamber and exchanged while expelling a large volume of air that has filled the inner chamber of the tire, so that the test gas and the air are mixed. The concentration of the test gas, especially helium gas, decreases. As a result, when the reused test gas is used, even if the tire has a leak, the test gas cannot be detected because the helium gas concentration is further lowered, and the leak detection may fail. There was a problem. In order to prevent such a leak test from failing, at present, after the leak test is completed, the test gas is released to the atmosphere and discarded, and a new test gas is supplied to the inner chamber every time the leak test is performed. However, if the test gas is discarded every time the leak test is performed, a large amount of the test gas (helium gas) is required every time, and the helium gas is also very expensive, so that the leak test cost is high. There was a problem that would be. The test gas is recovered after the above-described leak test, helium gas is separated from the recovered test gas, and then the separated helium gas and air are mixed to generate a test gas (helium / air mixture). The use of the generated test gas for the next leak test was also studied. However, there is a problem that such a separating operation requires a large and expensive separating device.

The present disclosure has an object to provide a method and an apparatus for inspecting a leakage of a tire, which can reduce the cost of the leakage inspection by reducing the amount of the inspection gas used for the leakage inspection.

Such an object is achieved by firstly sealing the inner chamber of the tire by a sealing means, storing the inner bag in the sealed inner chamber, and inflating the inner bag by supplying air from the air supply means. And a step of supplying a test gas from a test gas supply unit to an inner chamber between the inner bag and the tire, and a step of detecting leakage of the test gas from the tire by a detector provided outside the tire. This can be achieved by a method for inspecting tire leakage.

Secondly, a sealing means for sealing the inner chamber of the tire, an inner bag stored in the sealed inner chamber, an air supply means for supplying air to the inner bag to inflate the inner bag, A test gas supply means for supplying a test gas to an inner chamber between the tire and the tire, and a tire provided outside the tire and provided with a detector for detecting the test gas and detecting leakage of the test gas from the tire This can be achieved by the leak inspection device described above.

In the first and sixth aspects, air is supplied to an inner bag housed in an inner chamber of a sealed tire to inflate the inner bag, and a test gas is supplied to an inner chamber between the inner bag and the tire. However, since the leak of the inspection gas from the tire is detected by a detector provided outside the tire, the amount of the inspection gas can be reduced by the amount of air supplied into the inner bag. Leak inspection costs can be easily reduced.

In addition, according to the configuration of the second aspect, the volume of the inner chamber between the inner bag and the tire at the end of the air supply can be significantly reduced, thereby significantly reducing the amount of the test gas. And a stable test gas concentration can be obtained. Furthermore, if the configuration is made as in the third aspect, the supply time of the air and the test gas can be shortened, and the work efficiency can be easily improved. In addition, the configuration of the fourth aspect makes it possible to use the same amount of test gas for tires of different sizes, and the configuration of the fifth aspect reduces the cost of the test gas. Can be Further, by configuring as in the seventh aspect, it is possible to easily improve the detection accuracy and easily cope with a change in the type of tire. Further, with the configuration as in the eighth aspect, an existing tire vulcanizing bladder can be effectively used. Further, according to the ninth aspect, the elevating body, the inner bag can be supported, and the lower ring and the center post can be raised and lowered by the common first lifting mechanism. As a result, the entire apparatus can be simplified. And equipment cost can be reduced. Further, according to the configuration of the tenth aspect, it is possible to effectively suppress the situation where dust falling from above is mixed into the inspection gas.

It is the front view which showed some Embodiment 1 of this invention which was partly broken. It is the A section enlarged view of FIG.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
In FIGS. 1 and 2, reference numeral 11 denotes a fixed frame fixed on a floor surface, and a rotating body 13 rotatable around a vertical axis via a bearing 12 is provided directly above the fixed frame 11. A flange-shaped lower rim 14 is fixed to the upper end of the rotating body 13. A lower bead portion 16 of a vulcanized pneumatic tire 15 which is placed horizontally can be seated in an airtight state at an outer end of the lower rim 14 in the radial direction. Here, in the tire 15 as described above, it is rare that foreign matters such as stones and wood chips are mixed in the rubber, a cavity is formed in the rubber, and the rubber is foamed due to insufficient vulcanization. Therefore, it is desirable that the tire 15 having such a defect be removed by inspection. As an inspection for this purpose, for example, the inspection gas (helium / air mixture) is supplied into the inner chamber 17 of the tire 15 surrounded by the tire 15 as described above, and the inspection gas leaking from the tire 15 is leaked. What is detected by a detector is known. As described above, the leak of the inspection gas may occur between the tire 15 and the rim (the lower rim 14 and an upper rim described later).

A support 20 supported on the fixed frame 11 so as to be able to move up and down is installed above the rotating body 13. The support 20 has a plurality of vertically extending piston rods 22 of a cylinder 21 as a first elevating mechanism. Are connected, and the head side of these cylinders 21 is connected to the fixed frame 11. An axially central portion of a lifting body 23 having a cylindrical shape coaxial with the support hole 20a is inserted into a vertically extending support hole 20a formed at the center of the support 20. The elevating body 23 is supported so that it can rotate around an axis perpendicular to the supporting body 20 by interposing a plurality of bearings 24 between the elevating body 23 and the supporting body 20. Since the elevating body 23 installed above the lower rim 14 is supported by the supporting body 20 via the bearing 24, the elevating body 23 can be moved up and down integrally with the supporting body 20 by the operation of the cylinder 21. A flange-shaped upper rim 25 that is paired with the lower rim 14 is fixed to a lower end portion of the elevating body 23 projecting downward from a lower end of the support body 20. The upper bead portion 16 of the tire 15 is seated on the upper rim 25 in an air-tight state when the elevating body 23 is lowered by the operation of the cylinder 21. When the lower bead portion 16 of the tire 15 is seated on the lower rim 14 as described above, while the upper rim 25 is seated on the upper bead portion 16 of the tire 15 by the operation of the cylinder 21, the inner chamber 17 of the tire 15 Is sealed. For this reason, the lower rim 14, the upper rim 25, the elevating body 23, and the cylinder 21 constitute a part of the sealing means 26 for sealing the inner chamber 17 of the tire 15, that is, the sealing means 26 includes the lower rim 14, the upper rim 14. 25, an elevating body 23 and a cylinder 21. Reference numeral 27 denotes a bearing interposed between the support 20 and the upper rim 25.

リ ン グ A ring-shaped upper ring 29 is fixedly supported at the lower end of the elevating body 23 below the upper rim 25, here the lower end of the elevating body 23. The upper end of the inner bag 30 that can be expanded and contracted is held in an airtight state on the outer peripheral portion of the upper ring 29. Reference numeral 31 denotes a center post that is inserted into the elevating body 23 and that is supported by the elevating body 23 so as to be able to elevate and extend in the vertical direction. A lower ring 32 paired with the upper ring 29 is fixed to the lower end of the center post 31. The lower end of the inner bag 30 is held in an airtight state by a lower ring 32 provided at the lower end of the center post 31. As a result, the inner bag 30 is stored in the closed inner chamber 17. As described above, in this embodiment, the sealing means 26 includes the rotating body 13, the lower rim 14, the cylinder 21, the elevating body 23, the upper rim 25, and the center post 31. In the present disclosure, the sealing means includes a disc-shaped lower rim, an elevating body, a disc-shaped upper rim, and extends downward from the lower surface of the upper rim. It may be configured to include an extension rod which is provided with a supply / discharge passage for supplying air to the inner bag, and an elevating mechanism (cylinder, pinion rack mechanism, etc.) for elevating the elevating body. . Further, as the inner bag 30 described above, a bladder for tire vulcanization which is frequently used in the tire industry can be used. In this way, the existing tire vulcanizing bladders owned by each tire company can be used effectively, equipment costs can be reduced, and changes in the type of tire 15 can be easily dealt with. can do.

Reference numeral 33 denotes a cylinder as a second lifting / lowering mechanism, the rod side of which is fixed to the upper end of the lifting / lowering body 23 and extending coaxially with the lifting / lowering body 23 in the vertical direction. The tip of the piston rod 34 of the cylinder 33 is connected to the upper end of the center post 31. When the cylinder 33 operates, the center post 31 moves up and down separately from the elevating body 23. At this time, the lower ring 32 also moves up and down to approach and separate from the upper ring 29. On the other hand, when the cylinder 21 is operated while the operation of the cylinder 33 is stopped, in addition to the elevating body 23, the inner ring 30 is held, and the lower rings 29, 32 and the center post 31 are also integrally moved up and down. . For this reason, the cylinder 21 also functions as an elevating mechanism shared by them. As a result, the entire inspection apparatus can be simplified, and equipment costs can be reduced. In the present disclosure, the inner bag may be formed of a tire tube-shaped member made of thin rubber, or may be formed of a plurality of rubber balloons that are arranged in the circumferential direction and are spherical when inflated. Good. Further, in the present disclosure, the first and second lifting mechanisms may be configured by a rack and pinion mechanism or a screw mechanism.

Reference numeral 37 denotes an air supply / discharge passage formed in the elevating body 23 and the center post 31. One end of the supply / discharge passage 37 opens to the outer periphery of the lower end of the center post 31 between the upper ring 29 and the lower ring 32. On the other hand, the other end is connected to air supply means 39 such as an air pump via a hose 38 provided with a switching valve in the middle. As a result, when air (including air having a low oxygen concentration) is supplied from the air supply means 39 through the hose 38 and the supply / discharge passage 37 into the inner bag 30, the inner bag 30 is moved into the inner chamber 17 of the tire 15. Expands at Reference numeral 40 denotes a supply / discharge passage for the inspection gas formed in the elevating body 23 and the upper rim 25. A supply / discharge port 41 located at one end of the supply / discharge passage 40 is formed on a lower surface of the upper rim 25. On the other hand, the other end is connected to a test gas supply means 43 including a gas cylinder, a gas tank, and the like via a hose 42 provided with a switching valve in the middle. As a result, when the test gas is supplied from the test gas supply means 43 to the inner chamber 17 between the inner bag 30 and the tire 15 through the hose 42, the supply / discharge passage 40, and the supply / discharge port 41, the inner bag 30 The inner chamber 17 between the tires 15 is filled with a test gas. Here, as described above, the supply / discharge port 41 of the supply / discharge passage 40 for supplying / discharging the inspection gas to / from the inner chamber 17 between the inner bag 30 and the tire 15 may be formed on the lower surface of the upper rim 25. In addition, it is possible to effectively suppress the situation where dust falling from above enters the inspection gas, and it is possible to suppress the interruption of the work due to the clogging of the supply / discharge passage 40.

Supplying air to the inner bag 30 housed in the inner chamber 17 of the tire 15 thus sealed and inflating it, and supplying a test gas to the inner chamber 17 between the inner bag 30 and the tire 15 On the other hand, if the leak of the test gas from the tire 15 is detected by a detector described later provided outside the tire 15, the amount of the test gas supplied into the tire 15 can be reduced compared to the prior art. The amount of air supplied into the bag 30 can be reduced, so that the cost of leak inspection can be easily reduced. Here, as the above-mentioned inspection gas, a mixture gas of one or more of helium gas, hydrogen gas, argon gas and carbon dioxide gas, or a mixture gas obtained by adding nitrogen gas or the like to these gases is used. In this embodiment, a commercially available mixed gas of 5% hydrogen gas and 95% nitrogen gas, which is excellent in explosion-proof properties, is used.

If the test gas is composed of a mixed gas of hydrogen gas and nitrogen gas, the cost of the test gas can be easily reduced compared to the case where a mixed gas containing helium gas or the like is used as the test gas. it can. Here, in recent years, inexpensive hydrogen gas generators and nitrogen gas generators are commercially available. Hydrogen gas and nitrogen gas are generated by these generators, and by mixing both gases in consideration of explosion-proof properties, a hydrogen gas-nitrogen gas mixture gas with a high hydrogen gas concentration can be generated. In addition, the accuracy of detecting a leak can be easily improved. The pressure of the air supplied into the inner bag 30 and the pressure of the test gas supplied to the inner chamber 17 between the inner bag 30 and the tire 15 are equal pressures, but are usually 0.2 to 0.3 MPa (gauge). Pressure), air and test gas are used.

# 46 is a horizontal guide frame fixed to the fixed frame 11 on the side of the sealing means 26 and extending in the radial direction with respect to the tire 15. A slide bearing 49 fixed to the upper end of a vertically extending moving body 48 is slidably engaged with a guide rail 47 attached to the lower surface of the guide frame 46. Reference numeral 50 denotes a screw shaft rotatably supported by the guide frame 46 and extending along the guide rail 47. The screw shaft 50 is screwed into a part of the moving body 48 and connected to a rotating shaft of a motor (not shown). When the motor operates and the screw shaft 50 rotates, the moving body 48 moves in the radial direction of the tire 15 while being guided by the guide rail 47, and approaches and separates from the tire 15. Reference numeral 51 denotes a vertically extending guide rail fixed to the side surface of the moving body 48 on the tire 15 side. A slide bearing 53 fixed to the base end of an upper arm 52 extending toward the tire 15 is slidably engaged with the upper portion of the guide rail 51. On the other hand, a slide bearing 55 fixed to the base end of an L-shaped lower arm 54 is slidably engaged with the lower side of the guide rail 51. Reference numeral 56 denotes an upper screw shaft extending parallel to the guide rail 51 and rotatably supported on the upper part of the moving body 48, and 57 represents a lower screw shaft coaxial with the upper screw shaft 56 and rotatably supported on the lower part of the moving body 48. It is. The upper screw shaft 56 and the lower screw shaft 57 are reverse screws and are respectively connected to rotating shafts of two motors (not shown). When the motor operates to rotate the upper screw shaft 56 and the lower screw shaft 57, the upper arm 52 and the lower arm 54 move in the axial direction (up-down direction) of the tire 15 while being guided by the guide rail 51, and Move closer to and away from 15.

Reference numerals 60 and 61 denote upper and lower detectors fixed to the distal ends of the upper arm 52 and the lower arm 54, respectively. The upper detector 60 and the lower detector 61 are provided outside the tire 15 and leak the inspection gas from the tire 15 based on the above-described defect, or cause a leak between the tire 15 and the lower rim 14 and the upper rim 25. A leak of the test gas can be detected. Here, as the above-described upper detector 60 and lower detector 61, for example, a catalytic combustion sensor can be used for hydrogen gas detection. A mass analyzer can be used for helium gas detection. A gas heat conduction type sensor can be used for detecting argon gas and carbon dioxide gas. 62 is a plurality of measuring means provided on the upper arm 52 and the lower arm 54. These measuring means 62 measure the outer shape of the tire 15 after air is supplied to the inner bag 30 and the inspection gas is supplied to the inner chamber 17 between the inner bag 30 and the tire 15. Here, as the above-mentioned measuring means 62, for example, a two-dimensional laser sensor or an imaging tube can be used. Reference numeral 63 denotes a ring-shaped external gear fixed to the outer periphery of the rotating body 13. An external gear 65 fixed to an output shaft of a drive motor 64 meshes with the external gear 63. Then, air is supplied to the inner bag 30 as described above, and the inspection gas is supplied to the inner chamber 17 between the inner bag 30 and the tire 15 together. Is rotated around a major axis. The outer shape of the rotating tire 15 is measured by the measuring means 62 over the entire area.

結果 The result measured by the measuring means 62 is sent to the control means (not shown). At this time, the control means performs an operation based on the measurement result, and outputs a control signal to the motor (not shown). As a result, the moving body 48, the upper arm 52, and the lower arm 54 move, and move the upper detector 60 and the lower detector 61 to a detection position where leakage of the test gas can be detected. The motor (not shown), the screw shaft 50, the upper screw shaft 56, and the lower screw shaft 57 as a whole move the upper detector 60 and the lower detector 61 to the measurement position based on the measurement result from the measuring means 62. The moving means 68 is constituted. If such measuring means 62 and moving means 68 are provided, even if the type, for example, the size of the tire 15 is changed, such a change can be easily dealt with and the upper detection can be performed. The detector 60 and the lower detector 61 can be accurately moved to the optimum detection position where the leakage of the test gas can be detected with high accuracy. When the preparation is completed in this way, the upper detector 60 and the lower detector 61 are moved in the meridian direction along the outer shape of the tire 15 while rotating the tire 15, and leakage of the detection gas from the tire 15 is increased. Detection is performed by the detector 60 and the lower detector 61.

Next, the operation of the first embodiment will be described.
Now, the piston rod 22 of the cylinder 21 is retracted, the support body 20, the elevating body 23, the upper rim 25, and the upper ring 29 are stopped at the ascending limit, and the piston rod 34 of the cylinder 33 is projected and the center post 31, It is assumed that the inner bag 30 from which the air has been discharged has a substantially cylindrical shape by moving the ring 32 downward. At this time, the guide frame 46, the moving body 48, the upper arm 52, and the lower arm 54 integrally move outward in the radial direction and are separated from the lower rim 14. In this state, a horizontally placed tire 15 is carried between the lower rim 14 and the upper rim 25, and when the lower bead portion 16 of the tire 15 is seated on the lower rim 14, the piston rod 22 of the cylinder 21 Protrudes and the support 20, the elevating body 23, the upper rim 25, the upper ring 29, the center post 31, and the cylinder 33 descend integrally, but this descending continues even after the lower ring 32 contacts the lower rim 14. It is done. At this time, the distance between the upper ring 29 and the lower ring 32 gradually decreases due to the retraction of the piston rod 34 of the cylinder 33, whereby the inner bag 30 is crushed in the axial direction. At this time, low-pressure air may be supplied to the inner bag 30 from the air supply means 39 through the supply / discharge passage 37. Then, when the upper rim 25 comes into contact with the tire 15 and the upper bead portion 16 of the tire 15 is seated on the upper rim 25, the operation of the cylinder 21 is stopped and the support 20, the elevating body 23, the upper rim 25, the center The lowering of the post 31 and the cylinder 33 is stopped, and the operation of the cylinder 33 is stopped. As a result, the inner chamber 17 of the tire 15 is sealed by the sealing means 26, and the inner bag 30 is stored in the sealed inner chamber 17.

Next, air is supplied from the air supply means 39 into the inner bag 30 through the supply / discharge passage 37 to inflate the inner bag 30 in the inner chamber 17 of the tire 15, while the inner space between the tire 15 and the inner bag 30 is increased. Room 17 is open to the atmosphere. Then, after the supply of a predetermined amount of air from the air supply means 39 to the inner bag 30 is completed and the air pressure becomes a constant pressure, for example, about 95% of the test gas pressure, the supply / discharge passage from the test gas supply means 43 A test gas of a predetermined pressure (100% pressure) is supplied to the inner chamber 17 between the tire 15 and the inner bag 30 through 40. Here, the pressure of the air at the start of the supply of the test gas is usually lower than the pressure of the test gas, but the pressure on both sides of the inner bag 30, that is, the pressure of the air and the pressure of the test gas are always equal. Therefore, the inner bag 30 contracts to a position where both pressures are balanced. Here, air is supplied into the inner bag 30 until the outer surface of the inner bag 30 contacts the inner surface of the tire 15 over a wide area, and then the inspection gas is supplied to the inner chamber 17 between the inner bag 30 and the tire 15. Even when the tire 15 is supplied, since a large number of ridges are usually formed on the inner surface of the tire 15 at the time of vulcanization, the inner bag 30 is separated from the inner surface of the tire 15 by the supply of the inspection gas. As a result, a thin layer of the test gas is formed almost evenly between the tire 15 and the inner bag 30. By supplying the air and the test gas in the order described above, it is possible to perform the leak test on the entire range of the tire 15 without any problem, and to significantly reduce the supply amount of the test gas into the tire 15. The gas concentration of the test gas in the inner chamber 17 (here, the hydrogen gas concentration) can be made a stable value.

In the present disclosure, the supply of air to the inner bag 30 and the supply of the test gas to the inner chamber 17 between the inner bag 30 and the tire 15 are performed at least partially at the same time, in other words, the air is supplied. The time during which the test gas is supplied and the time during which the test gas is supplied may partially or entirely overlap. In this case, the time for supplying the air and the test gas can be reduced, and the work time can be reduced. Efficiency can be easily improved. Also, if the original pressure of the above-mentioned air and the test gas is, for example, 10: 1 and the air and the test gas are simultaneously supplied up to a predetermined pressure, the supply amount of the air to the test gas becomes approximately 10: 1, Inspection gas usage can be reduced to almost 1/10. Here, as a form of duplication as described above,
(1) The supply of air and the supply of test gas are started at the same time, and the supply of these air and gas is completed at the same time. (2) The supply of test gas from the middle of air supply is common, but both are common. The supply of test gas at the same time, or the supply of test gas after the supply of air, or the supply of air after the supply of test gas, (3) during the supply of test gas Although the supply of air is common, the supply of both is terminated at the same time, or the supply of test gas is terminated after the supply of air is terminated, or the supply of air is terminated after the supply of test gas is terminated. A form can be mentioned. Further, in the present disclosure, a predetermined amount of a low-pressure (slightly higher than the atmospheric pressure) test gas is supplied to the inner chamber 17 of the tire 15, and after the supply of the test gas, a predetermined pressure of While supplying the air to compress the test gas, the inner bag 30 may be inflated to a position where the pressures of the two are balanced. In this way, it is possible to perform a leak test with a fixed amount of test gas even for tires 15 of different types and sizes, and the amount of test gas used can be uniform regardless of the tire 15.

As described above, in the present disclosure, the air is supplied from the air supply unit 39 to the inner bag 30 to inflate the inner bag 30, and the test gas is supplied from the test gas supply unit 43 to the inner chamber 17 between the inner bag 30 and the tire 15. I am trying to supply. In this manner, the amount of the inspection gas can be reduced by the amount of air supplied into the inner bag 30, and thus the cost of the leakage inspection can be easily reduced. When the supply of air to the inner bag 30 and the supply of the inspection gas to the inner chamber 17 between the inner bag 30 and the tire 15 are completed, the motor is operated to rotate the screw shaft 50, and the moving body 48, The upper arm 52 and the lower arm 54 are integrally moved radially inward to approach the tire 15. At this time, the drive motor 64 is operated to rotate the tire 15 around a vertical axis. While the tire 15 is rotating, the measuring device 62 measures the outer shape of the tire 15 over the entire circumference. The result measured by the measuring means 62 is sent to the control means. At this time, the control means performs an operation based on the measurement result and outputs a control signal to a motor that drives the screw shaft 50, the upper screw shaft 56, and the lower screw shaft 57. Thereby, the screw shaft 50, the upper screw shaft 56, and the lower screw shaft 57 rotate to move the moving body 48, the upper arm 52, and the lower arm 54, and move the upper detector 60 and the lower detector 61 to the detection position. . Thereafter, by moving the upper detector 60 and the lower detector 61 in the meridian direction along the outer shape of the tire 15 while rotating the tire 15, it passes through a location where leakage may occur, and The detection gas leak is detected by the upper detector 60 and the lower detector 61.

The present disclosure is applicable to an industrial field for detecting a leak of a test gas supplied to an inner chamber of a tire.

The disclosure of Japanese Patent Application No. 2018-119288 filed on June 22, 2018 is referred to in its entirety.
All publications, patent applications, and technical standards referred to in this specification are to the same extent as if each individual publication, patent application, or technical standard was specifically and individually stated to be referenced. Referenced in the specification.

Claims (10)

1. Sealing the inner chamber of the tire by a sealing means, storing the inner bag in the sealed inner chamber, and supplying air from the air supply means to the inner bag to inflate the inner bag; A method for detecting leakage of a tire, comprising: a step of supplying a test gas from a test gas supply means to an inner chamber of the tire; and a step of detecting leakage of the test gas from the tire by a detector provided outside the tire.
2. The method according to claim 1, wherein after the supply of air to the inner bag is completed, a test gas is supplied to an inner chamber between the inner bag and the tire.
3. The tire leak detection method according to claim 1, wherein the supply of air to the inner bag and the supply of the inspection gas to the inner chamber between the inner bag and the tire are performed at least partially at the same time.
4. 4. The method according to claim 1, wherein after the supply of the test gas to the inner chamber of the tire is completed, air is supplied to the inner bag to expand the inner bag while compressing the test gas.
5. The tire leak detection method according to any one of claims 1 to 4, wherein the inspection gas is a mixed gas of hydrogen gas and nitrogen gas.
6. Sealing means for sealing the inner chamber of the tire, an inner bag housed in the sealed inner chamber, air supply means for supplying air to the inner bag to inflate the inner bag, and A tire leak detection device including a test gas supply means for supplying a test gas to an inner chamber between the tires, and a detector provided outside the tire and detecting a test gas leak from the tire by detecting the test gas. .
7. After the air is supplied to the inner bag and the test gas is supplied to the inner chamber between the inner bag and the tire, a measuring means for measuring the outer shape of the tire is provided, and a detector is provided based on the measurement result by the measuring means. 7. The tire leak detecting device according to claim 6, wherein a moving means for moving the tire to the detection position is provided.
8. The tire leak detecting device according to claim 6 or 7, wherein a tire vulcanizing bladder is used as the inner bag.
9. The sealing means is a lower rim that allows the lower bead portion of the horizontally placed tire to be seated in an airtight state, an elevating body that is installed above the lower rim and that can move up and down, and an upper rim fixed to the elevating body. A first elevating mechanism for lowering the elevating body so that the upper rim is seated in an airtight state on the upper bead portion of the tire, while being supported by an elevating body below the upper rim, and an upper end of the inner bag. An upper ring that holds the lower end of the inner bag in an air-tight state, a center post that is supported by the elevating body so as to be able to move up and down, and that extends vertically. The tire leak detecting device according to any one of claims 6 to 8, further comprising: a second elevating mechanism that elevates and lowers the center post independently of the elevating body.
10. The tire leak detecting device according to claim 9, wherein a supply / discharge port for supplying / discharging the inspection gas to / from the inner chamber between the inner bag and the tire is formed on a lower surface of the upper rim.

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