JP4487011B1 - Magnet mounting method and magnet removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and efficiently perform a detaching operation while preventing damage to a permanent magnet when a permanent magnet having a rim attached to a spindle is attached or detached in a tire inspection apparatus.
In the magnet mounting method of the present invention, a bottomed mounting hole 18 into which a permanent magnet 9 is inserted is formed in a spindle 6, and the bottom of the mounting hole 18 faces away from the opening side of the mounting hole 18. An extending through-hole 28 is formed, and a rod-shaped guide member 29 is inserted into the through-hole 28 until the protruding end protrudes from the bottom of the mounting hole 18 toward the opening side so as to counteract the magnetizing force of the permanent magnet 9 on the bottom. The permanent magnet 9 is inserted into the mounting hole 18 while supporting the bottom side of the permanent magnet 9 with the protruding end of the guide member 29. When removing the permanent magnet 9, the permanent magnet 9 may be extracted from the mounting hole 18 while pushing up the bottom side of the permanent magnet 9 at the protruding end of the guide member 29 so as to counteract the magnetizing force of the permanent magnet 9.
[Selection] Figure 4

Description

  The present invention relates to a magnet attachment method and a magnet removal method used when a permanent magnet is attached to and detached from a rim exchange device of a tire inspection device.

2. Description of the Related Art Conventionally, a tire inspection apparatus that performs product inspection on a finished tire is provided with a pair of rims that sandwich and support the tire. There are several types of rims depending on the size of the tire to be supported. If the size or type of the tire to be inspected changes, the rim must be replaced. Therefore, the conventional tire inspection apparatus is provided with a rim exchanging apparatus for exchanging rims.
As such a rim exchanging device, for example, a device that fixes a rim with a fixing member that is swingably provided on the spindle side is known. However, such a rim exchanging device that mechanically fixes the rim using the fixing member tends to have a complicated structure, which is not preferable in terms of the device price and maintenance.

Therefore, in order to make it easier to attach / detach the rim, Patent Document 1 discloses a rim exchanging device that attaches / detaches the rim to / from the spindle using a permanent magnet.
JP-A-1-283131

By the way, the rim exchanging device disclosed in Patent Document 1 employs a configuration in which a bottomed mounting hole is formed in the flange portion of the spindle, and a permanent magnet such as a ferrite magnet having a strong magnetic force is mounted in the mounting hole. However, when the permanent magnet is brought close to the bottom of the mounting hole, a strong magnetic force (magnetization force) is generated between the permanent magnet and the bottom of the mounting hole, so that the permanent magnet strikes the bottom of the mounting hole vigorously. There is a possibility that the permanent magnet formed of the brittle material is damaged.
In addition, when the permanent magnet is incorporated into the mounting hole, if the permanent magnet is drawn to the inner surface of the mounting hole or the spindle surface around the opening of the mounting hole, the same permanent magnet may be damaged. It can happen.

If such permanent magnet breakage occurs, the magnet pieces will scatter and become magnetically attached to the surface of the spindle, such as the inside of the mounting hole or the flange, and the work of removing these pieces will be necessary, greatly reducing productivity. become.
Also, if a magnetic force acts inside the mounting hole or between the surface of the spindle and the permanent magnet, it is difficult to remove the permanent magnet from the mounting hole due to this magnetic force, and the once installed permanent magnet will not be removed. It was.
The present invention has been made in view of the above-described problems, and can prevent the permanent magnet from being damaged by preventing the permanent magnet from being vigorously attached to the inside of the permanent magnet mounting hole or the surface of the spindle. It is an object of the present invention to provide a magnet attaching method and a magnet removing method which can easily and efficiently perform a magnet attaching / detaching operation.

In order to achieve the object, the present invention takes the following technical means.
That is, the magnet mounting method of the present invention includes a rim that sandwiches a tire and is fixed to a spindle, and a tire inspection device that includes a permanent magnet that fixes the rim and the spindle on the spindle side. A magnet mounting method for mounting,
A bottomed mounting hole into which the permanent magnet is inserted is formed in the spindle, and a through hole is formed at the bottom of the mounting hole so as to extend in a direction opposite to the opening side of the mounting hole. A rod-shaped guide member is inserted until the protruding end protrudes from the bottom of the mounting hole toward the opening, and the permanent magnet of the permanent magnet is inserted at the protruding end of the guiding member so as to oppose the magnetizing force of the permanent magnet to the bottom. The permanent magnet is inserted into the mounting hole while supporting the bottom side.

In this way, even if a force (magnetic adhesion force) is applied between the permanent magnet and the bottom portion of the mounting hole, the guide member supports the permanent magnet from the bottom side of the mounting hole at the tip. Therefore, it is possible to prevent the permanent magnet from violently hitting the bottom of the mounting hole and being damaged. The mounting hole is preferably opened on the side facing the rim. In this case, the permanent magnet may be inserted into the mounting hole from the rim side.
In this way, since the permanent magnet can be brought close to the rim, the rim can be fixed to the spindle side with as much magnetic force as possible.

Furthermore, the guide member may be formed of a magnetic material, and the permanent magnet may be inserted into the mounting hole in a state of being magnetically attached to the protruding end of the guide member.
In this way, the permanent magnet is magnetically attached to the protruding end of the guide member, and it is difficult for the permanent magnet to shift laterally from the guide member. Even if the permanent magnet is attracted to the inside of the mounting hole or the surface of the spindle due to some kind of beat, However, it is difficult to approach the inside of the mounting hole or the surface of the spindle. Therefore, the permanent magnet can be inserted into the mounting hole while being firmly held by the guide member, and the permanent magnet can be easily inserted into the mounting hole without being disturbed by the magnetic adhesion force.

The following may be provided for the permanent magnet.
For example, a lid body is provided on the surface of the permanent magnet facing the rim so as to prevent the permanent magnet from directly touching the rim, and the permanent magnet and the lid body are integrated (together) or separated (separately). It can also be inserted into the mounting hole.
In this way, even if the permanent magnet is damaged due to an impact on the permanent magnet from the outside, the broken pieces of the magnet will not be scattered outside the mounting hole, and the productivity will not be greatly impaired.

In addition, a case body made of a nonmagnetic material that restricts the permanent magnet from directly touching the inner peripheral surface of the mounting hole is provided on the outer peripheral side of the permanent magnet, and the permanent magnet and the case body are integrated (together) or separately. The body (separately) can be inserted into the mounting hole.
This restricts the permanent magnet from being magnetized directly to the inner peripheral surface of the mounting hole, and the force that attracts the permanent magnet to the inner peripheral surface of the mounting hole is reduced, so that the permanent magnet is not obstructed by the magnetic force. The magnet can be easily inserted into the mounting hole.
Furthermore, a bottom body that restricts the permanent magnet from directly touching the bottom of the mounting hole may be provided on the bottom surface of the permanent magnet, and the permanent magnet and the bottom body may be inserted into the mounting hole integrally (together).

In this way, since the permanent magnet is protected by the bottom body, the permanent magnet does not strike the bottom of the mounting hole directly and the damage is less likely to occur.
If the bottom body is formed of a magnetic material, even if the permanent magnet is broken, the pieces are magnetically attached to the magnetic material member, and the pieces can be easily removed from the mounting hole.
In addition, the outer peripheral surface of the case body and the inner peripheral surface of the mounting hole are formed to be screwable with each other, the guide member and the through hole are screwed together, and the guide member is attached to the through hole. The guide member is inserted into the mounting hole by rotating, the bottom of the permanent magnet is supported by the protruding end of the guide member, and the permanent magnet is adjusted while adjusting the position of the protruding end by rotating the guide member. You may make it insert in a mounting hole. If it does in this way, even if the magnetic force of a permanent magnet is acting in a mounting hole by rotating a case body with respect to a mounting hole, a permanent magnet can be easily inserted or removed. Further, since the permanent magnet is firmly held by the guide member that is screwed into the through hole, the permanent magnet can be more reliably prevented from hitting the bottom of the mounting hole and being damaged. Furthermore, since the case body inserted in the mounting hole is attached by screwing, it does not fall out of the mounting hole.

Furthermore, since the guide member is screwed into the through hole, the guide member does not move unexpectedly in the mounting hole. Therefore, the permanent magnet can be inserted into the mounting hole while the permanent magnet is securely held by the protruding end of the guide member.
In the magnet mounting method of the present invention, the permanent magnet can be attached to and detached from the mounting hole without guiding the permanent magnet by the guide member.
For example, in a tire inspection apparatus provided with a rim that sandwiches a tire and is fixed to a spindle, and a permanent magnet that fixes the rim and the spindle on the spindle side, a magnet mounting method for attaching the permanent magnet to the spindle,
A bottomed mounting hole into which the permanent magnet is inserted is formed in the spindle, and a case body that restricts the permanent magnet from directly touching the inner peripheral surface and the bottom of the mounting hole is provided, and the outer peripheral surface of the case body And the inner peripheral surface of the mounting hole are formed so as to be able to be screwed together, the case body is screwed into the mounting hole, and the permanent body is fixed by the case body so as to counteract the magnetizing force of the permanent magnet on the bottom portion. The permanent magnet and the case body may be inserted into the mounting hole while supporting the bottom side of the magnet.

In this manner, the permanent magnet attached to the case body is taken out from the mounting hole while twisting out the case body, so that the permanent magnet can be removed so as not to tilt with respect to the mounting hole. Further, as compared with the case where the guide member is used to support the permanent magnet, the insertion / removal operation of the guide member becomes unnecessary, and the workability is further improved.
On the other hand, when removing the permanent magnet attached to the spindle from the spindle using the magnet attaching method described above, the magnet removing method of the present invention is provided with a rod-shaped guide member in the through hole, and the protruding end of the permanent magnet. It is inserted until it hits the bottom side, and the permanent magnet is extracted from the mounting hole while pushing the bottom side of the permanent magnet at the protruding end of the guide member so as to counteract the magnetizing force of the permanent magnet. .

When removing the permanent magnet inserted into the mounting hole integrally with or separately from the lid from the spindle, integrally with the lid or separately from the spindle, a rod-shaped guide member is inserted into the through-hole, and the protruding end is the tip. Insert the lid until it hits the bottom side of the permanent magnet, and push up the bottom side of the permanent magnet at the protruding end of the guide member so as to counteract the magnetizing force of the permanent magnet. It is good to pull out from the mounting hole.
Further, when removing the permanent magnet inserted into the mounting hole integrally or separately from the case body from the spindle, insert a rod-shaped guide member into the through-hole until the protruding end contacts the bottom side of the permanent magnet. The case body and the permanent magnet may be extracted integrally from the mounting hole while pressing the bottom side of the permanent magnet at the protruding end of the guide member so as to counteract the magnetizing force of the permanent magnet.

Further, when the permanent magnet inserted into the mounting hole integrally with the bottom body is removed from the spindle, a rod-shaped guide member is inserted into the through-hole until the protruding end contacts the bottom body, and the magnet of the permanent magnet is inserted. The bottom body and the permanent magnet may be extracted from the mounting hole integrally (together) while pushing the bottom body at the protruding end of the guide member so as to oppose the attachment force.
When the permanent magnet inserted into the mounting hole integrally with the case body is removed from the spindle while the case body is screwed into the mounting hole, a rod-shaped guide member is inserted into the through-hole, and the protruding end is the case. It is inserted until it touches the bottom side of the body, the bottom of the permanent magnet is pushed by the protruding end of the guide member, and the case body screwed into the mounting hole is twisted in the direction opposite to the screwing direction, and the case body and the permanent body are permanently It is good to pull out the magnet from the mounting hole.

Further, when removing the permanent magnet inserted into the mounting hole from the spindle while rotating the guide member with respect to the through-hole, the guide member is rotated in the direction opposite to that at the time of attachment. It is preferable to insert the permanent magnet into the mounting hole while pushing the bottom side of the permanent magnet with the protruding end of the guide member.
Further, the permanent magnet inserted into the mounting hole is removed from the spindle while screwing a case body that restricts the permanent magnet from directly contacting the inner peripheral surface and bottom of the mounting hole without using a guide member. At this time, it is preferable that the case body and the permanent magnet are integrally (jointly) extracted from the mounting hole while twisting in the opposite direction to that when the case body is attached.

  According to the magnet attachment method and the magnet removal method of the present invention, it is possible to easily and efficiently perform the removal operation of the permanent magnet by preventing the permanent magnet from being damaged or the permanent magnet from being magnetically attached to the spindle.

First, a tire inspection apparatus 1 in which a magnet attaching method and a magnet removing method are performed will be described with reference to the drawings.
As schematically shown in FIG. 1, the tire inspection apparatus 1 of the present invention is provided in a frame 3 installed so as to straddle an upper portion of a conveyance roller 2 that conveys a tire T to be inspected in a horizontal state. And upper and lower spindles 14 and 16 for rotating the tire T between the upper and lower rims 4 and 5 and a rotating drum 22 which moves horizontally with respect to the tire T of the upper and lower spindles 14 and 16 and is freely contacted and separated. The tire T is configured to measure the uniformity, shape or dynamic balance of the rotating tire T.

The tire inspection apparatus 1 also includes upper and lower permanent magnets 9 and 10 that magnetically attach the upper and lower rims 4 and 5 to the upper and lower spindles 14 and 16 and the upper and lower rims 4 and 5 according to the type and size of the tire T. And a rim attaching / detaching mechanism including upper and lower rim exchanging devices 11 and 12 which are attached to and detached from the upper and lower spindles 14 and 16, respectively.
In addition, let the up-down direction of the paper surface of FIG. 1 be the up-down direction at the time of describing the tire inspection apparatus 1. Further, the direction away from the rotation axis of the upper spindle 14 in the radial direction is defined as the radially outer side when the tire inspection apparatus 1 is described, and the direction approaching the rotation axis from the radially outer side is defined as the radially inner side.

As shown in FIGS. 1 and 2, the upper spindle 14 is configured as an upper spindle 14 that is rotationally driven in both forward and reverse directions by a drive motor 13. An engaging portion 15 that is recessed upward is formed on the lower end surface of the upper spindle 14, and the upper and lower spindles 14, 16 are connected to each other by fitting the upper end of the lower spindle 16 into the engaging portion 15. It is connected to one.
On the lower end side of the upper spindle 14, a flange portion 17 is formed so as to protrude from the outer peripheral surface in a plate shape. The lower surface of the flange portion 17 is formed flat, and a plurality of upper mounting holes 18 that are recessed upward are formed around the rotational axis of the upper spindle 14 on the flat lower surface. The upper permanent magnets 9 for magnetically attaching the upper rim 4 to the upper spindle 14 are respectively attached to the mounting holes 18.

The upper permanent magnet 9 is inserted into each of a plurality of mounting holes 18 formed in the lower surface of the flange portion 17 of the upper spindle 14. The upper permanent magnet 9 is accommodated in these bottomed mounting holes 18 opened downward, and generates a strong magnetic force toward the lower surface side of the flange portion 17 of the upper spindle 14. The upper spindle 14 can be magnetically attached.
As shown in FIGS. 1 and 3, the lower spindle 16 is rotatably attached to the lower spindle housing 7, and the spindle housing 7 is attached to an elevating cylinder 44 that is extendable in the vertical direction. Yes. The upper end of the lower spindle 16 is tapered upward and can be engaged with the engaging portion 15 of the upper spindle 14. Further, a flange portion 20 projecting in a plate shape is formed below the tapered portion of the lower spindle 16. The upper surface of the flange portion 20 is formed flat, and a plurality of lower mounting holes 21 recessed downward are formed around the rotational axis of the lower spindle 16 on the flat upper surface. The lower permanent magnets 10 for magnetically attaching the lower rim 5 to the lower spindle 16 are mounted in the mounting holes 21, respectively.

The lower permanent magnet 10 is inserted into a bottomed mounting hole 21 formed on the upper surface of the flange portion 20 of the lower spindle 16 in the same manner as the upper permanent magnet 9 so that the lower rim 5 can be magnetized. It has become.
As shown in FIG. 1, the drum unit 8 includes a rotary drum 22 that is formed in a cylindrical shape around an axis that faces in the vertical direction, and a drum support 23 that rotatably supports the rotary drum 22. . The drum unit 8 causes the simulated road surface formed on the outer peripheral surface of the rotating drum 22 to contact and separate from the tire T by moving the drum support 23 in the horizontal direction using the slide rail 24 with respect to the frame 3. It is configured to be able to.

  In the tire inspection apparatus 1 of this embodiment, the elevating cylinder 44 is extended and the lower spindle 16 is moved upward to be connected to the upper spindle 14, and between the upper and lower rims 4, 5 attached to the upper and lower spindles 14, 16. The tire T is held by sandwiching the tire T therebetween. When the tire T is driven and rotated while being in contact with the rotating drum 22, a force resulting from a load during traveling of the tire T acts on the rotating drum 22, and a uniformity measuring unit (not shown) attached to the rotating drum 22. By measuring this force, the uniformity of the tire T is evaluated.

As shown in FIGS. 2 and 3, when the upper and lower rims 4 and 5 are mounted, the rim attaching / detaching mechanism is arranged on the upper and lower sides provided on the flange portions 17 and 20 of the upper and lower spindles 14 and 16, as described above. The upper and lower rims 4, 5 are magnetically attached to the upper and lower spindles 14, 16 using permanent magnets 9, 10. When removing the upper and lower rims 4 and 5, the upper rim 4 is removed from the upper spindle 14 using the upper rim exchanging device 11, and after the upper rim is removed by the upper rim exchanging device 11, the lower rim exchanging device 12 is removed. The lower rim 5 is used and removed from the lower spindle 16.
The upper rim exchanging device 11 includes a bracket 25 attached to the lower end portion of the frame 3 in a hanging manner and an actuator 26 provided at the lower end of the bracket 25, and the upper rim 4 is moved by the pressing force of the actuator 26. The upper spindle 14 can be separated from the flange portion 17.

The lower rim exchanging device 12 is a box-shaped member attached to the frame 3, and a lower rim attaching / detaching hole 27 is formed in an opening shape on the upper surface thereof. The lower rim attachment / detachment hole 27 is formed to have a size that allows passage of the flange portion 20 of the lower spindle 16 in the vertical direction but does not allow passage of the lower rim 5 in the vertical direction. The lower rim 5 is formed so that the lower rim 5 can be separated from the lower spindle 16 by moving the lower spindle 16 on which the rim 5 is magnetized downward.
When the upper and lower rims 4 and 5 are attached to the upper and lower spindles 14 and 16 using the rim attaching / detaching mechanism, the upper and lower rims 4 and 5 are previously placed on the lower rim exchanging device 12 so as to be concentric with the lower rim attaching / detaching hole 27. If the lower spindle 16 is extended upward, the lower rim 5 is first placed on the lower spindle 16 by the lower permanent magnet 10 and the upper rim 4 by the upper permanent magnet 9. Are magnetically attached to the upper spindle 14 in order, and the upper and lower rims 4 and 5 are attached.

  However, when the permanent magnets 9 and 10 as described above are mounted in the mounting holes 18 and 20 of the upper and lower spindles 14 and 16, the permanent magnets 9 and 10 are easily damaged. The case where the upper permanent magnet 9 is mounted in the mounting hole 18 will be described as an example. When the permanent magnet 9 is brought close to the bottom of the mounting hole 18, a strong magnetic force (magnetization force) is generated between the permanent magnet 9 and the bottom of the mounting hole 18. ) Occurs, the permanent magnet 9 may strike the bottom of the mounting hole 18 violently, and the permanent magnet 9 formed of a brittle material such as ferrite may be damaged. Further, when the permanent magnet 9 is attracted to the inner peripheral surface of the mounting hole 18 or the surface of the upper spindle 14 around the opening portion with some momentum, the same permanent magnet 9 may be damaged.

When the permanent magnet 9 is broken, the magnet pieces are scattered and magnetically attached to the inside of the mounting hole 18 and the surface of the upper spindle 14, and it is necessary to remove these pieces. This greatly impairs the productivity of various inspections. In addition, since a magnetic force acts between the inside of the mounting hole 18 and the permanent magnet 9 when the permanent magnet 9 is attached or detached, the magnetic force becomes an obstacle to make the permanent magnet 9 move smoothly with respect to the mounting hole 18. It may be impossible to insert and remove, and it may take time to attach and detach the permanent magnet 9.
Therefore, in the magnet mounting method of the present invention, a through hole 28 extending toward the side opposite to the opening side is formed at the bottom of the mounting holes 18 and 21, and a rod-shaped guide member 29 is mounted to the through hole 28 at its protruding end. Insert the holes 18 and 21 from the bottoms of the holes 18 and 21 to the outside of the openings so that the bottoms of the permanent magnets 9 and 10 are fixed at the protruding ends of the guide members 29 so as to oppose the magnetizing force of the permanent magnets 9 and 10 to the bottoms. The permanent magnets 9 and 10 are attached while being supported.

The through-hole 28 is formed so as to linearly connect the bottom of the mounting holes 18 and 21 and the surface of the mounting holes 18 and 21 and the surface of the flanges 17 and 20 on the opposite side in the vertical direction. ing. The through hole 28 is formed to have a hole diameter through which the permanent magnets 9 and 10 inserted in the mounting holes 18 and 21 cannot pass, and the permanent magnets 9 and 10 do not fall out through the through hole 28.
The guide member 29 is formed in a rod shape having a thickness that can be inserted into the through hole 28. The guide member 29 is inserted into the through hole 28 from the opening side opposite to the opening side of the mounting holes 18, 21, and protrudes in the mounting holes 18, 21 or above the opening at the permanent magnets 9, 10. Is configured to be supported from the bottom side. The guide member 29 of the present embodiment is formed of a magnetic material that generates a magnetic force in a direction attracting the bottom side of the permanent magnets 9 and 10, and the bottom portions of the permanent magnets 9 and 10 are magnetically attached to the projecting ends. Thus, the permanent magnets 9 and 10 can be inserted into the mounting holes 18 and 21. The guide member 29 may be a metal material that can be magnetized as long as it is magnetically attached to the bottom side of the permanent magnets 9, 10, or a magnet having a different polarity from the bottom side of the permanent magnets 9, 10. There may be.

Specifically, the magnet attachment method of the present embodiment is performed as follows. The case where the upper permanent magnet 9 is inserted into the mounting hole 18 formed in the flange portion 17 of the upper spindle 14 will be described as an example.
As shown in FIG. 4A, in the flange portion 17 of the upper spindle 14, the mounting hole 18 opens downward. When the upper permanent magnet 9 is inserted into the mounting hole 18, the guide member 29 is first inserted downward from the upper opening of the through hole 28.
As shown in FIG. 4B, when the guide member 29 is inserted into the through hole 28, the protruding end of the guide member 29 penetrates into the mounting hole 18. Then, with respect to the guide member 29 protruding to the outside of the mounting hole 18 through the opening of the mounting hole 18, the magnetic force is attracted between the protruding end of the guide member 29 and the bottom of the permanent magnet 9. The protruding end of the guide member 29 is magnetically attached to the bottom of the permanent magnet 9. In this state, by supporting the end of the guide member 29 opposite to the permanent magnet 9 side, the permanent magnet 9 is resisted against the magnetic force (magnetization force) to the bottom side of the mounting hole 18 by the protruding end of the guide member 29. It can be supported from the bottom side.

As shown in FIG. 4C, when the permanent magnet 9 is brought close to the bottom side of the mounting hole 18, a large magnetic force (magnetization force) acts between the permanent magnet 9 and the bottom of the mounting hole 18. 9 is strongly attracted to the bottom side of the mounting hole 18. However, if the permanent magnet 9 is supported from the bottom side by the protruding end of the guide member 29 as described above, the permanent magnet 9 is slowly inserted into the mounting hole 18 against the magnetic force applied to the bottom of the mounting hole 18. Can do.
In this way, by supporting the permanent magnet 9 until it reaches the bottom of the mounting hole 18, it is possible to prevent the permanent magnet 9 from striking the bottom and being damaged.
Further, when the permanent magnet 9 is brought close to the mounting hole 18 while being supported by the guide member 29, a magnetic force acts between the permanent magnet 9 and the inner peripheral surface of the mounting hole 18 of the upper spindle 14 and the periphery of the opening. Become. However, in particular, if the guide member 29 is formed of a magnetic material that attracts the bottom side of the permanent magnet 9, the permanent magnet 9 is magnetically attached to the protruding end of the guide member 29, so that the permanent magnet 9 magnetically attached to the guide member 29 is guided. It becomes difficult to shift laterally from the protruding end of the member 29, and the insertion of the permanent magnet 9 becomes smoother and easier.

  In addition, what is necessary is just to operate in the reverse procedure to the time of attachment, when removing the permanent magnet 9 inserted in the mounting hole 18. That is, the rod-shaped guide member 29 is inserted into the through-hole 28 until the protruding end contacts the bottom side of the permanent magnet 9, and then the bottom of the permanent magnet 9 at the protruding end of the guide member 29 so as to oppose the magnetic force of the permanent magnet 9. Push the side up. In this way, even if the permanent magnet 9 is strongly magnetically attached to the bottom of the mounting hole 18, the permanent magnet 9 can be opposed to the magnetic force acting between the permanent magnet 9 and the bottom of the mounting hole 18. The permanent magnet 9 can be easily removed from the mounting hole 18.

Next, magnet attachment methods and magnet removal methods according to the second to fourth embodiments will be described.
The permanent magnet 9 attached by the magnet attaching method and the magnet removing method of the first embodiment is composed of only a magnet. However, as shown in FIGS. 5A to 5C, a lid 30, a case body 31, and / or a bottom body 32 is provided in advance on the permanent magnet 9, and a magnet attachment method and a magnet removal method are provided. May be made even easier.
As shown in the left diagram of FIG. 5A, for example, in the magnet attaching method and the magnet removing method of the second embodiment, the permanent magnet 9 is directly attached to the upper rim 4 on the surface of the permanent magnet 9 facing the upper rim 4. A lid 30 that suppresses touching is provided.

The lid 30 is a plate member provided on the surface of the permanent magnet 9 on the opening side of the mounting hole 18 and is formed of a nonmagnetic material that is not magnetically attached to the permanent magnet 9 in this embodiment. The lid 30 is fixed to the surface of the permanent magnet 9 and moves together with the permanent magnet 9 when attached or removed.
The lid 30 is formed in an area slightly larger than the surface of the permanent magnet 9. On the other hand, the mounting hole 18 of the second embodiment is formed in a stepped hole shape in which the lower part (opening side) has an inner diameter larger than that of the upper part, and the permanent magnet 9 is provided above the mounting hole 18 and the mounting hole 18. The lid 30 can be fitted in the lower part of the cover. Therefore, when the permanent magnet 9 is inserted into the upper portion of the mounting hole 18, the lid 30 is fitted into the lower portion of the mounting hole 18 so that the mounting hole 18 is in a sealed state. It is possible to suppress debris when the permanent magnet 9 is damaged due to any beat from being scattered from the mounting hole 18. Further, the lid body 30 prevents the upper rim 4 from directly hitting and prevents the permanent magnet 9 from being damaged by an impact when the rim is attached or detached.

Next, the magnet attachment method and the magnet removal method of the second embodiment are specifically performed as follows.
As shown in the right figure of FIG. 5A, when attaching the permanent magnet 9 integrally provided with the lid 30 to the mounting hole 18, the permanent magnet 9 is supported from the bottom side by the protruding end of the guide member 29. Then, the permanent magnet 9 and the lid body 30 are integrally inserted into the mounting hole 18. In this way, the permanent magnet 9 is inserted into the upper portion of the mounting hole 18 while being supported from the bottom side by the protruding end of the guide member 29, and the lid body 30 covers the lower portion of the mounting hole. The body 30 is attached. When the permanent magnet 9 is removed from the mounting hole 18, a rod-shaped guide member 29 is inserted into the through hole 28 until the protruding end contacts the bottom side of the permanent magnet 9, so that the guide member opposes the magnetic force of the permanent magnet 9. The lid 30 and the permanent magnet 9 are integrally extracted from the mounting hole while the bottom end of the permanent magnet 9 is pushed up by the protruding end 29.

If the lid 30 is provided in this way, even if the permanent magnet 9 is broken due to some time signature such as an external impact such as an impact when the rim is attached / detached, the fragments may be scattered outside the mounting hole. There is no.
In addition, in 2nd Embodiment, although the thing in which the cover body 30 was provided integrally with the permanent magnet 9 was illustrated, the cover body 30 can also be provided detachably with the permanent magnet 9 (separate body). In such a case, when attaching the permanent magnet 9 to the mounting hole 18, the permanent magnet 9 is first inserted into the upper part of the mounting hole 18, and then the lid 30 is fitted into the lower part of the mounting hole 18.

Further, the lid body 30 can be fitted into the opening of the mounting hole 18 so that the position of the lower surface of the lid body 30 is slightly above the surface of the flange portion 17 of the upper spindle 14 (inside the mounting hole). In this way, even if the upper rim 4 is configured to come into contact with the flange portion 17 in a surface state, a gap is formed between the surface of the lid 30 and the upper rim 4, and the lid is separated from the upper rim 4. The impact at the time of attachment / detachment transmitted to the permanent magnet 9 via 30 can be further reduced.
As shown in the left diagram of FIG. 5B, for example, in the magnet attachment method and the magnet removal method of the third embodiment, in addition to the lid body 30, the inner peripheral surface of the mounting hole 18 on the outer peripheral side of the permanent magnet 9. A case body 31 is provided to prevent the permanent magnet 9 and the lid body 30 from touching directly.

  The case body 31 is formed in a cylindrical shape whose inner diameter is larger than the outer diameter of the permanent magnet 9, and is formed so as to be movable integrally with the permanent magnet 9 by accommodating the permanent magnet 9 on the inner peripheral side. The width of the case body 31 in the vertical direction is formed to be thicker than the permanent magnet 9 by the thickness of the lid body 30, and the case body 31 connects the magnetic material lid body 30 and the permanent magnet 9, which are superposed on each other, from the outer peripheral side. It is formed so that it can be enclosed. The case body 31 is made of a nonmagnetic material such as synthetic resin, stainless steel, aluminum, or copper, and is configured not to generate a magnetic force with the permanent magnet 9. Therefore, when the permanent magnet 9 to which the case body 31 is attached is inserted into the mounting hole 18, the inner peripheral surface of the mounting hole 18 and the periphery of the opening are equal to the thickness of the case body 31 formed of a nonmagnetic material. And the permanent magnet 9 are weakened, and the permanent magnet 9 can be inserted into the mounting hole 18 without being obstructed by the magnetic force. Further, by enclosing the outer peripheral side of the permanent magnet 9 made of a magnetic material and the lid body 30 with a case body 31 made of a non-magnetic material, the magnetic force of the permanent magnet 9 is stronger on the upper rim 4 side (lower side). Thus, the upper rim 4 can be strongly magnetically attached to the flange portion 17 of the upper spindle 14. Furthermore, even if the permanent magnet 9 is broken at any moment, such as an impact from the outside such as an impact when the rim is attached or detached, there is no possibility that the fragments will be scattered outside the mounting hole.

Next, the magnet attachment method and the magnet removal method of the third embodiment are specifically performed as follows.
5B, when attaching the permanent magnet 9 integrally provided with the case body 31 to the mounting hole 18, the permanent magnet 9 is supported from the bottom side by the protruding end of the guide member 29. As shown in FIG. And the case body 31 are integrally inserted into the mounting hole 18. In this way, the permanent magnet 9 is inserted into the mounting hole 18 while being supported from the bottom side by the protruding end of the guide member 29 and the case body 31 is formed between the outer peripheral side of the permanent magnet 9 and the inner peripheral surface of the mounting hole 18. The case body 31 can be inserted into the mounting hole 18 together with the permanent magnet 9. Further, when removing the permanent magnet 9 from the mounting hole 18, a rod-shaped guide member 29 is inserted into the through hole 28 until the protruding end contacts the bottom side of the permanent magnet 9, and is guided so as to oppose the magnetizing force of the permanent magnet 9. While pushing up the bottom side of the permanent magnet 9 with the protruding end of the member 29, the case body 31 and the permanent magnet 9 are extracted from the mounting hole 18 integrally.

As described above, the permanent magnet 9 and the case body 31 are integrally inserted into and removed from the mounting hole 18, so that the inner peripheral surface of the mounting hole 18 and the periphery of the opening are equal to the thickness of the case body 31 formed of a nonmagnetic material. The magnetic force generated between the permanent magnet 9 and the permanent magnet 9 is weakened, so that the permanent magnet 9 can be easily attached and detached.
Note that in the third embodiment, the lid member 30 and the case body 31 are inserted into the mounting hole integrally with the permanent magnet 9, but the lid member 30, the case body 31, and the permanent magnet 9 are individually (separately provided). It can also be inserted into the mounting hole. In this way, for example, the case body 31 can be attached in advance to the inner peripheral surface of the mounting hole 18, and the permanent magnet 9 can be smoothly inserted into the mounting hole 18, or the permanent magnet 9 can be inserted from the mounting hole 18. Can be taken out smoothly, and the permanent magnet 9 can be attached and detached more easily.

As shown in the left diagram of FIG. 5C, in the magnet attachment method and the magnet removal method of the fourth embodiment, in addition to the lid body 30 and the case body 31, the bottom portion of the mounting hole 18 is formed on the bottom surface of the permanent magnet 9. A bottom body 32 is provided to prevent the permanent magnet 9 from being directly touched.
The bottom body 32 is a plate member disposed at the bottom of the permanent magnet 9, and is formed of a nonmagnetic material in the present embodiment. The bottom body 32 is formed integrally with the case body 31 described above and covers the bottom surface side of the permanent magnet 9, and moves (integrally) with the permanent magnet 9 during installation or removal to enter the mounting hole 18. It can be attached and detached. Therefore, when the permanent magnet 9 is inserted into the mounting hole 18 together with the bottom body 32, the magnetic force generated between the bottom surface of the mounting hole 18 and the permanent magnet 9 is equal to the thickness of the bottom body 32 formed of a nonmagnetic material. The permanent magnet 9 can be attached and detached more easily while preventing the permanent magnet 9 from being damaged.

Specifically, the magnet attachment method and the magnet removal method of the fourth embodiment are performed as follows.
When the permanent magnet 9 is attached to the mounting hole 18 together with the bottom body 32 formed integrally with the case body 30 as shown in the right view of FIG. 5C, it is supported from the bottom side by the protruding end of the guide member 29. Then, the permanent magnet 9 and the bottom body 32 are inserted into the mounting hole 18 together (together). Further, when removing the permanent magnet 9 from the mounting hole 18, the rod-shaped guide member 29 is inserted into the through hole 28 until the protruding end contacts the bottom body 32, and the protruding end of the guiding member 29 is opposed to the magnetic force of the permanent magnet. While pushing up the bottom body 32, the bottom body 32 and the permanent magnet 9 are integrally extracted from the mounting hole 18.

In this way, even if the permanent magnet 9 is broken due to some time signature such as an external impact such as an impact when the rim is attached or detached, there is no possibility that the fragments will be scattered outside the mounting hole. Furthermore, the debris can be removed from the mounting hole 18 together with the case body 30 and the bottom body 32, so that it is not necessary to use extra labor for disposing of the debris of the permanent magnet 9, and the work for removing and attaching the permanent magnet 9 is efficient. Can be done automatically.
In addition, about the cover body 30, the case body 31, or the bottom body 32 illustrated in the second to fourth embodiments, at least any one or two of them are selected and attached to the permanent magnet 9 in advance. All of these may be attached to the permanent magnet 9 in advance. Further, when a plurality of lids 30, case bodies 31, or bottom bodies 32 are selected and provided on the permanent magnet 9, at least one of them is formed of a magnetic material, and the rest is formed of a nonmagnetic material. Is good. In this way, even if the permanent magnet 9 is damaged, the fragments are magnetically attached to at least one of the lid 30, the case body 31, or the bottom body 32, and it becomes easy to remove the fragments from the mounting hole 18. It is. In addition, the method for fixing the case body 31 to the mounting hole 18 and the method for fixing the case body 31 to the case body 31 can be appropriately selected from adhesion, welding, screwing, screwing (screwing), and the like. Further, if the method of inserting the permanent magnet 9 into the mounting hole while guiding with the guide member 29 is performed, it is necessary to attach the lid body 30, the case body 31 or the bottom body 32 to the permanent magnet in advance. There is no.

Next, a magnet attachment method and a magnet removal method according to the fifth embodiment will be described.
The permanent magnet 9 used in the magnet attaching method and the magnet removing method of the fifth embodiment includes a lid body 30 and a case body 31 as in the third to fourth embodiments. In the case body 31 of the fifth embodiment, the case body 31 is formed of a nonmagnetic material that is not magnetically attached to the permanent magnet 9, and the outer peripheral surface of the case body 31 and the inner peripheral surface of the mounting hole 18 can be screwed together. It has become.
That is, a first male screw portion 34 that can be screwed into a first female screw portion 33 formed on the inner peripheral surface of the mounting hole is formed on the outer peripheral surface of the case body 31. Therefore, when the case body 31 is rotated in one direction with respect to the mounting hole 18, the first male screw portion 34 of the case body 31 is screwed into the first female screw portion 33 of the mounting hole, and the permanent magnet is moved to the case body 31. And inserted into the mounting hole. Further, if the case body 31 is rotated in the reverse direction, the permanent magnet 9 comes out of the mounting hole 18 together with the case body 31, and the permanent magnet 9 can be attached and detached.
An opening that is slightly smaller than the inner diameter of the case body is formed on the rim mounting side of the case body 31, and a lid 30 made of a magnetic material is attached to the opening from the inside of the case body 31. Yes. This lid is formed in a shape in which two discs having different diameters are overlapped, with the large diameter portion fitted into the inner periphery of the case body 31 and the small diameter portion fitted into the opening. The thickness of the small diameter portion (vertical height) is set to be equal to or less than the depth of the opening (vertical height).

  In the fifth embodiment, the guide member 29 is formed of a magnetic material, and the outer peripheral surface of the guide member 29 and the inner peripheral surface of the through hole 28 can be screwed together. That is, a second male screw portion 36 that can be screwed into a second female screw portion 35 formed on the inner peripheral surface of the through hole 28 is formed on the outer peripheral surface of the guide member 29. Therefore, if the guide member 29 is rotated in either direction with respect to the through hole 28, the second male screw portion 36 of the guide member 29 is screwed into the second female screw portion 35 of the through hole 28, and the guide member 29. The permanent magnet 9 can be attached to and detached from the mounting hole 18 while accurately adjusting the position of the protruding end in the vertical direction. Further, if the pitch between the second male screw portion 36 and the second female screw portion 35 is reduced, the guide member 29 can be moved with a strong force in the vertical direction even when the force for rotating the guide member 29 is weak. Even when a strong magnetic force acts between the permanent magnet 9 and the bottom of the mounting hole 18, the permanent magnet 9 can be attached to and detached from the mounting hole 18 against the magnetic force of the permanent magnet 9. It becomes. Further, it is possible to prevent the guide member 29 from inadvertently moving in the axial direction (vertical direction).

Specifically, the magnet attaching method and the magnet removing method of the fifth embodiment are performed as follows.
As shown in FIG. 6A, a case body 31 that covers the outer peripheral surface of the permanent magnet 9 is provided outside the permanent magnet 9, and a case is provided below the case body 31 (on the rim mounting side). A detachable jig 37 for rotating the body 31 is attached. Four engaging recesses 38 are formed on the lower end surface of the case body 31 at equal intervals around the rotation axis of the guide member 29. The engaging recess 38 is formed in a concave shape upward, and can be engaged with the engaging protrusion 39 of the jig 37 from below the case body 31. Therefore, when the jig 37 is rotated in any direction, the case body 31 rotates with respect to the mounting hole 18.

In this state, when the guide member 29 is rotated in one direction (clockwise in FIG. 6) with respect to the through hole 28, the second male screw portion 36 formed on the outer peripheral surface of the guide member 29 becomes the inner peripheral surface of the through hole 28. And the guide member 29 moves downward. Eventually, the protruding end of the guide member 29 comes into contact with the upper surface of the permanent magnet 9 and the guide member 29 and the permanent magnet 9 are magnetized.
As shown in FIG. 6B, when the guide member 29 and the permanent magnet 9 are magnetized, the guide member 29 is rotated in the reverse direction (counterclockwise in FIG. 6) with respect to the through hole 28. While the second male screw portion 36 is screwed into the second female screw portion 35, the guide member 29 moves upward, and the position of the protruding end of the guide member 29 changes upward. Further, when the jig 37 is rotated in the same direction as the rotation direction of the guide member 29, the first male screw portion 34 formed on the outer peripheral surface of the case body 31 engaged with the jig 37 becomes the inner peripheral surface of the mounting hole 18. The case body 31 moves upward while being twisted (rotating).

As shown in FIG. 6C, when the case body 31 is completely accommodated in the mounting hole 18, it is screwed into the guide hole 40 extending from the side surface of the flange portion 17 toward the inner peripheral surface of the mounting hole 18. The lock pin 41 provided in the state is protruded, and the case body 31 is fixed in the mounting hole 18 with the lock pin 41.
In this way, when removing the permanent magnet 9 inserted into the mounting hole 18, the operation may be performed in the reverse order of the attachment. That is, the guide member 29 screwed into the through hole 28 is screwed in until the protruding end of the guide member 29 contacts the bottom side of the case body 31, and the case body 31 screwed in the mounting hole 18 is twisted in the direction opposite to the screwing direction. In addition, the case body 31 and the permanent magnet 9 may be extracted from the mounting hole 18 integrally while rotating the guide member 29 in the direction opposite to that at the time of attachment.

In this way, the guide member 29 can be rotated with respect to the through hole 28, and the case body 31 can be rotated with respect to the mounting hole 18 to finely adjust the position while supporting the permanent magnet 9. While the magnet 9 is securely supported, the permanent magnet 9 can be slowly brought close to the mounting hole 18, and the permanent magnet 9 can be more reliably prevented from hitting the bottom of the mounting hole 18 and being damaged. Further, since the case body 31 inserted into the mounting hole 18 is attached by screwing, the permanent magnet 9 does not fall out of the mounting hole 18.
Further, a strong pushing force can be applied to the permanent magnet 9 by the guide member 29 screwed into the through hole 28 configured like a screw jack, and the guide member 29 is rotated with respect to the through hole 28. However, the permanent magnet 9 can be gradually and reliably extracted from the mounting hole 18.

In the fifth embodiment, the outer peripheral surface of the case body 31 and the inner peripheral surface of the mounting hole 18 are screwed together, and the outer peripheral surface of the guide member 29 and the inner peripheral surface of the through hole 28 are screwed together. Has been described as an example. However, only the outer peripheral surface of the case body 31 and the inner peripheral surface of the mounting hole may be screwed together, or only the outer peripheral surface of the guide member 29 and the inner peripheral surface of the through hole 28 may be mutually connected. You may comprise so that it may screw together. Moreover, you may add the baseplate which contact | abuts the end surface of the case body which opposes this to the bottom part side of a mounting hole.
Next, a magnet attachment method and a magnet removal method according to the sixth embodiment will be described.

As shown in FIG. 7, in the magnet attaching method and the magnet removing method of the sixth embodiment, unlike the first to fifth embodiments, a guide member 29 for guiding the permanent magnet 9 into the mounting hole 18 is provided. It is not used, and the through hole 28 for inserting the guide member 29 is not provided in the flange portion 17. And the case body 31 which suppresses that the permanent magnet 9 touches directly the inner peripheral surface and bottom face of the mounting hole 18, ie, the case body 31 formed in the bottomed side in the mounting hole 31, is provided, On the outer peripheral surface of the case body 31, a second female screw portion 35 that is screwed together with a first male screw portion 34 formed on the inner peripheral surface of the mounting hole 18 is formed.
Similarly to the fifth embodiment, four engaging recesses 38 are formed on the lower end surface of the case body 31 at equal intervals around the rotation axis. The engaging recess 38 is formed in a concave shape upward, and a detachable jig 37 for rotating the case body 31 is attached.

  Therefore, when attaching the permanent magnet 9 to the mounting hole 18, the case body 31 is rotated in one direction with respect to the mounting hole 18. As a result, the first male threaded portion 34 of the case body 31 is screwed into the first female threaded portion 33 of the mounting hole 18, the case body 31 moves upward, and the permanent magnet 9 is attached together with the case body 31 to the mounting hole. 18 is inserted. Further, when removing the permanent magnet 9 from the mounting hole 18, the case body 31 is rotated in the direction opposite to that at the time of attachment. In this way, the case body 31 can be moved while supporting the permanent magnet by the case body 31 so as to oppose the adhesive force of the permanent magnet to the bottom of the mounting hole. In this way, by supporting the permanent magnet 9 until it reaches the bottom of the mounting hole 18, it is possible to prevent the permanent magnet 9 from striking the bottom and being damaged. Further, the permanent magnet 9 can be taken out from the mounting hole 18 together with the case body 31 while twisting the case body 31, and the permanent magnet 9 can be removed without being inclined with respect to the mounting hole 18. It is possible to save adjustment work and to improve workability than to attach and detach the permanent magnet 9.

Although the sixth embodiment has been described with no lid provided, for example, a lid may be provided as in the other embodiments described above.
The present invention is not limited to the above-described embodiments, and the shape, structure, material, combination, and the like of each member can be appropriately changed without changing the essence of the invention.
In the above embodiment, the guide member 29 formed of a magnetic material is exemplified. However, the guide member 29 may be made of a nonmagnetic material.
The screwing between the outer peripheral surface of the case body 31 and the inner peripheral surface of the mounting hole 18 and the screwing between the outer peripheral surface of the guide member 29 and the inner peripheral surface of the through hole 28 disclosed in the fifth embodiment are as follows. The present invention can also be applied to the embodiment to the fourth embodiment.

  In the above embodiment, the magnet attaching method and the magnet removing method have been described by taking as an example the case where the upper permanent magnet 9 is attached to and detached from the mounting hole 18 formed in the flange portion 17 of the upper spindle 14. However, the magnet attaching method and the magnet removing method of the present invention can also be used when the lower permanent magnet 10 is attached to and detached from the mounting hole 21 formed in the flange portion 20 of the lower spindle 16.

It is a front view of a tire inspection apparatus. It is front sectional drawing of an upper spindle. It is front sectional drawing of a lower spindle. It is explanatory drawing which shows the magnet attachment method and magnet removal method of 1st Embodiment. It is explanatory drawing which shows the magnet attachment method and magnet removal method of 2nd Embodiment-4th Embodiment. It is explanatory drawing which shows the magnet attachment method and magnet removal method of 5th Embodiment. It is explanatory drawing which shows the magnet attachment method and magnet removal method of 6th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire inspection apparatus 2 Conveyance roller 3 Frame 4 Upper rim 5 Lower rim 6 Upper spindle housing 7 Lower spindle housing 8 Drum part 9 Upper permanent magnet 10 Lower permanent magnet 11 Upper rim exchanging device 12 Lower rim exchanging device 13 Drive motor DESCRIPTION OF SYMBOLS 14 Upper spindle 15 Engagement part 16 Lower spindle 17 Upper flange part 18 Upper mounting hole 20 Lower flange part 21 Lower mounting hole 22 Rotary drum 23 Drum support 24 Slide rail 25 Bracket 26 Actuator 27 Lower rim attachment / detachment Hole 28 Through-hole 29 Guide member 30 Lid 31 Case body 32 Bottom 33 First female screw part 34 First male screw part 35 Second female screw part 36 Second male screw part 37 Jig 38 Engaging recess 39 Engaging protrusion 40 Guide hole 41 Lock Pin T Tire

Claims (17)

In a tire inspection apparatus provided with a rim that sandwiches a tire and is fixed to a spindle, and a permanent magnet that fixes the rim and the spindle on the spindle side, a magnet mounting method for attaching the permanent magnet to the spindle,
A bottomed mounting hole into which the permanent magnet is inserted is formed in the spindle,
In the bottom of the mounting hole, a through-hole extending toward the side opposite to the opening side of the mounting hole is formed,
Insert the rod-shaped guide member into the through-hole until the protruding end penetrates from the bottom of the mounting hole toward the opening side,
A magnet mounting method comprising: inserting the permanent magnet into the mounting hole while supporting the bottom side of the permanent magnet at the protruding end of the guide member so as to counteract the magnetizing force of the permanent magnet on the bottom. . The mounting hole is open on the side facing the rim,
The magnet mounting method according to claim 1, wherein the permanent magnet is inserted into the mounting hole from the rim side. The guide member is formed of a magnetic material;
Insert the guide member until its tip penetrates through the opening,
The magnet mounting method according to claim 1, wherein the permanent magnet is inserted into the mounting hole in a state of being magnetically attached to the protruding end. A lid is provided on the surface of the permanent magnet facing the rim to restrict the permanent magnet from directly touching the rim,
The magnet mounting method according to claim 1, wherein the permanent magnet and the lid are inserted into the mounting hole integrally or separately. A case body made of a non-magnetic material that restricts the permanent magnet from directly touching the inner peripheral surface of the mounting hole is provided on the outer peripheral side of the permanent magnet,
The magnet mounting method according to claim 1 , wherein the permanent magnet and the case body are inserted into the mounting hole integrally or separately.
A bottom body is provided on the bottom surface of the permanent magnet to restrict the permanent magnet from directly touching the bottom of the mounting hole,
The magnet mounting method according to claim 1 , wherein the permanent magnet and the bottom body are integrally inserted into the mounting hole.   The magnet attachment method according to claim 6, wherein the bottom body is formed of a magnetic material. The outer peripheral surface of the case body and the inner peripheral surface of the mounting hole are formed so that they can be screwed together,
The magnet mounting method according to claim 5, wherein the permanent magnet and the case body are integrally inserted into the mounting hole while the case body is screwed into the mounting hole. The outer peripheral surface of the guide member and the inner peripheral surface of the through hole are formed so as to be able to be screwed together, and the guide member and the through hole are screwed together,
The guide member is rotated with respect to the through hole, and the guide member is inserted into the mounting hole.
2. The permanent magnet is inserted into the mounting hole while the bottom of the permanent magnet is supported by the protruding end of the guide member, and the position of the protruding end is adjusted by rotating the guide member. A method for attaching a magnet to a tire inspection apparatus according to any one of -8. In a tire inspection apparatus provided with a rim that sandwiches a tire and is fixed to a spindle, and a permanent magnet that fixes the rim and the spindle on the spindle side, a magnet mounting method for attaching the permanent magnet to the spindle,
A bottomed mounting hole into which the permanent magnet is inserted is formed in the spindle,
A case body is provided that restricts the permanent magnet from directly touching the inner peripheral surface and bottom of the mounting hole,
The outer peripheral surface of the case body and the inner peripheral surface of the mounting hole are formed so that they can be screwed together,
The case body is screwed into the mounting hole, and the permanent magnet and the case body are attached to the mounting hole while supporting the bottom side of the permanent magnet by the case body so as to oppose the magnetizing force of the permanent magnet to the bottom portion. A magnet mounting method characterized by being inserted into the magnet. When removing the permanent magnet attached to the spindle using the magnet attaching method according to any one of claims 1 to 3,
Insert the rod-shaped guide member into the through-hole until the protruding end hits the bottom side of the permanent magnet,
A magnet removal method comprising: pulling out the permanent magnet from the mounting hole while pushing up the bottom side of the permanent magnet at the protruding end of the guide member so as to counteract the magnetizing force of the permanent magnet. When removing the permanent magnet attached to the spindle using the magnet attachment method according to claim 4 from the spindle integrally with the lid or separately from the spindle.
Insert the rod-shaped guide member into the through-hole until the protruding end hits the bottom side of the permanent magnet,
A magnet removal method comprising: pulling out the permanent magnet from the mounting hole while pushing up the bottom side of the permanent magnet at the protruding end of the guide member so as to oppose the magnetizing force of the permanent magnet. When removing the permanent magnet attached to the spindle from the spindle using the magnet attaching method according to claim 5,
Insert the rod-shaped guide member into the through-hole until the protruding end hits the bottom side of the permanent magnet,
The magnet removing method, wherein the case body and the permanent magnet are integrally extracted from the mounting hole while pushing up the bottom side of the permanent magnet at the protruding end of the guide member so as to oppose the magnetizing force of the permanent magnet. When removing the permanent magnet attached to the spindle using the magnet attachment method according to claim 6 or 7, from the spindle,
Insert a rod-shaped guide member into the through-hole until its tip hits the bottom body,
The magnet removing method, wherein the bottom body and the permanent magnet are integrally extracted from the mounting hole while pushing up the bottom body at the protruding end of the guide member so as to oppose the magnetizing force of the permanent magnet. When removing the permanent magnet attached to the spindle using the magnet attaching method according to claim 8,
Insert the rod-shaped guide member into the through-hole until the protruding end hits the bottom side of the case body,
While pushing up the bottom side of the permanent magnet at the protruding end of the guide member and twisting the case body screwed into the mounting hole in a direction opposite to the screwing direction, the case body and the permanent magnet are integrally extracted from the mounting hole. A method for removing a magnet characterized by the above. When removing the permanent magnet attached to the spindle using the magnet attaching method according to claim 9,
The guide member is inserted in the through hole by rotating in the opposite direction to the time of attachment,
A method of removing a magnet, wherein the permanent magnet is extracted from the mounting hole while pushing up the bottom side of the permanent magnet with the protruding end of the guide member. When removing the permanent magnet attached to the spindle from the spindle using the magnet attaching method according to claim 10,
A method for removing a magnet, wherein the case body and the permanent magnet are integrally extracted from the mounting hole while twisting in a direction opposite to that when the case body is attached.

Images