JPH1034667A - Method and apparatus for applying releasing liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform cost down for production of a tire while deterioration of working environment such as floating of releasing liq. under misty condition is prevented from occurring. SOLUTION: When a releasing liq. R is fed on the inner periphery of a thin conical rotating body 49 rotating around an axial line, after the releasing liq. R flows toward another side in the axial direction while the releasing liq. R is spread on the inner periphery, it is scattered from the whole periphery of another end 49b in the axial direction toward the outside in the radial direction by a centrifugal force while it is turned into drop-like shape in the vertical face. Therefore, there exists no possibility that the releasing liq. R is scattered into mist-like shape to the environment and the working environment becomes good and installation of a coating booth and a dirt pickup apparatus becomes unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for applying a release liquid to an inner surface of a green tire.

[0002]

2. Description of the Related Art Generally, after a green tire is housed in a vulcanizing mold, a vulcanized bladder disposed in the inner space of the green tire is expanded with a high-temperature, high-pressure vulcanizing medium to vulcanize the green tire. Thereafter, the vulcanized bladder is shrunk to separate the vulcanized bladder from the inner surface of the vulcanized tire. Here, if the above-described peeling is not performed smoothly, problems such as damage to the vulcanized tire or the vulcanized bladder may occur. A mold liquid is applied so that the vulcanized bladder can be peeled off smoothly after vulcanization.

Conventionally, such a release liquid is applied by pressurizing the release liquid in a tank and mixing it with high-pressure air while injecting the release liquid from an injection port of a spray gun. Was sprayed on the inner surface of the raw tire.

[0004]

However, the coating method using such a spray gun has a problem that the working environment is deteriorated because the release liquid is mist-like and scatters around. . In order to solve such problems, a sealed coating booth is separately provided between the tire molding device and the vulcanizing device, and the coating operation as described above is performed in the coating booth, or A dust suction device is installed in the vicinity of the tank to collect scattered mist of the release liquid.However, in the former case, a large-scale application booth is required, and in the latter case, For this reason, expensive dust-absorbing devices are required, which has generally hindered a reduction in tire production costs.

An object of the present invention is to provide a method and an apparatus for applying a release liquid, which can reduce the cost of tire production while preventing the working environment from deteriorating.

[0006]

SUMMARY OF THE INVENTION The purpose of the invention is as follows.
In the inner space of the raw tire, while supplying the mold release liquid to the inner circumference while rotating the rotating body that has become wider toward the other end in the axial direction from the one end in the axial direction, In which the release liquid is scattered radially outward from the entire circumference of the other end in the axial direction of the rotating body by centrifugal force and applied to the entire inner surface of the raw tire. Secondly, the rotating body that expands from one end in the axial direction to the other end in the axial direction, a rotating means for rotating the rotating body disposed in the inner space of the raw tire around the axis, A supply unit that continuously supplies the release liquid to the inner periphery of the rotating body, and a moving unit that moves the rotating body in the axial direction of the raw tire,
The release liquid supplied to the inner periphery of the rotating body is scattered radially outward from the entire circumference of the other end in the axial direction of the rotating body by centrifugal force and applied to the entire inner surface of the raw tire. This can be achieved by a coating device.

When the release liquid is applied to the inner surface of the green tire, the release liquid is continuously supplied to the inner periphery of the rotating body by a supply means. At this time, the rotating body is supplied from one end in the axial direction. The rotating body is configured to expand toward the other end in the axial direction, and furthermore, since the rotating body is rotated around the axis by being driven by the rotating means, the supplied release liquid is supplied to the inner periphery of the rotating body. While spreading, it flows to the other side in the axial direction due to centrifugal force, and when it reaches the other end in the axial direction of the rotating body, it is scattered in the form of droplets radially outward from the entire circumference of the other end in the axial direction. Here, since the rotating body is located in the inner space of the green tire, the scattered release liquid is applied to the inner surface of the green tire. When the rotating body is moved in the axial direction of the raw tire by the moving means in such a state, the application position is sequentially moved, and the release liquid is applied to the entire inner surface of the raw tire. In this way, the release liquid is sprayed radially outward from the rotating body by centrifugal force as it is in the form of a liquid, so that the release liquid becomes mist and scatters around. There is no. As a result, the working environment is improved, and the installation of a paint booth and a dust-absorbing device is not required, and the cost of tire production can be reduced.

[0008] Further, according to the present invention, the mold release liquid can be applied to the inner surface of the sidewall portion of the green tire extending substantially in the radial direction without fail. Further, the transfer of the raw tire from the tire forming apparatus to the vulcanizing apparatus is usually performed by suspending a standing (vertically placed) raw tire on a hook, as described in claims 3 and 7. With this configuration, the coating operation can be performed with the posture at the time of transportation, and the work efficiency is improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 11 denotes a tire forming apparatus. The tire forming apparatus 11 includes a rotatable and expandable / reducible diameter forming drum 12. The forming drum 12 has a carcass layer wound therearound, and the carcass layer is expanded into a substantially semicircular shape. Thereafter, a belt layer and tread rubber are attached to the outside of the carcass layer to form a radial tire. Is molded. Reference numeral 13 denotes a raw tire storage stand provided apart from the forming drum 11, and the raw tire storage base 13 has an L-shaped frame 14.
And a plurality of horizontal support rods 15 whose base ends are fixed to the frame 14. Each support rod 15 supports the raw tire M in a hooked state.

Reference numeral 16 denotes a horizontal mounting beam installed so as to extend horizontally above the tire forming apparatus 11 and the tire storage table 13.
A rail 17 extending from the vehicle to the tire storage table 13 is attached. Reference numeral 18 denotes a transfer device movably supported by the rail 17, and the transfer device 18 is capable of suspending a raw tire M in an upright state (a vertically placed state in which the axis is substantially horizontal) at the lower end. The hook 19 can be swung in a horizontal plane and can be moved up and down. twenty one
Is a tire table installed between the tire forming apparatus 11 and the tire storage table 13.On this tire table 21, the raw tire M transported from the tire molding apparatus 11 by the transport apparatus 18 is provided. It is placed in the posture at the time of transportation, that is, in a standing state.

Reference numeral 25 denotes a release liquid coating device installed near the tire placing table 21. The coating device 25 has a vertically extending frame 26, and a release liquid R A tank 27 storing the water is attached. A motor 28 is fixed to the upper end of the tank 27,
A rotating shaft 29 of 28 is inserted into the tank 27, and a stirring blade 30 for stirring the release liquid R is fixed to a tip of the rotating shaft 29. Numeral 34 denotes a rack supported by the upper end of the frame 26. The rack 34 extends parallel to the axis of the raw tire M on the table 21. Reference numeral 35 denotes a stepping motor mounted on the frame 26.
A pinion 37 that meshes with the rack 34 is provided at the tip of the 35 rotation shaft 36.
Has been fixed. As a result, the stepping motor
When the pinion 37 rotates by operating the pin 35, the rack 34 moves along the axis of the raw tire M on the table 21. A vertically extending mounting plate 38 is fixed to the end of the rack 34 closest to the raw tire M.
A bellows 39 is provided around the rack 34 between the frame 38 and the frame 26.
Is arranged. The mounting plate 38 has a rack 34
The base end of the support rod 41 extending in parallel to is fixed, and
Above the support rod 41, a cylinder 42 extending parallel to the support rod 41 is installed, and its head side is rotatably connected to the mounting plate 38. The tip of the support rod 41 and the piston rod of the cylinder 42
An inclined plate 44 extending in a substantially vertical direction is rotatably connected to the distal end of 43. As a result, when the cylinder 42 operates and the piston rod 43 projects or retracts, the inclined plate 44 inclines in a vertical plane about the connection position with the support rod 41.

1, 2 and 3, the inclined plate
A motor 47 as a rotating means is attached to a lower end portion of the motor 44, and a rotating shaft 48 of the motor 47 extends substantially parallel to the cylinder 42. A rotating body 49 coaxial with the rotating shaft 48 is fixed to the distal end of the rotating shaft 48. The rotating body 49 expands from one end (tip) 49a in the axial direction to the other end (base end) 49b in the axial direction. Here, it has a thin cone shape. And this rotating body 49 is a raw tire M on the placing table 21.
When the motor 47 is arranged in the inner space K, the motor 47 rotates around the axis. The rack 34, the stepping motor 35, and the pinion 37 described above constitute a moving unit 50 for moving the rotating body 49 in the axial direction of the raw tire M as a whole.
2. The inclined plate 44 as a whole is a rotator inclining means for inclining the axis of the rotator 49 with respect to the axis of the raw tire M.
Make up 51.

Reference numeral 54 denotes a switching valve attached to the distal end of the motor 47. The switching valve 54 is connected to a base end of a supply pipe 56 extending parallel to the rotating shaft 48. The supply pipe 56 extends to a position facing the inner periphery of one end in the axial direction of the rotating body 49, and has a supply port 55
Are formed. Reference numeral 57 denotes a switching valve attached to the lower end of the tank 27. The switching valve 57 and the switching valve 54 are connected by a connection hose 58. As a result, the switching valve 57 is switched to the open position, and the connection hose 58
When the switching valve 54 is switched to a position at which the fluid R and the supply pipe 56 communicate with each other, the release liquid R in the tank 27 passes through the connection hose 58 and the supply pipe 56 and the rotation of the rotating body 49 rotating from the supply port 55. It is continuously supplied to the inner circumference at one axial end. Switching valve described above
As a whole, the supply pipes 54 and 57, the supply pipe 56, and the connection hose 58 constitute supply means 59 for continuously supplying the release liquid R to the inner periphery of the rotating rotating body 49. An air hose 60 connects the switching valve 54 to an air source (not shown). When the application of the release liquid R is stopped for a long time, in order to prevent the release liquid R from being clogged in the connection hose 58, a position where the air hose 60 and the connection hose 58 communicate with each other is used. The switching valve 54 is switched, and the release liquid R in the connection hose 58 is pushed back into the tank 27 by air.

Next, the operation of the embodiment of the present invention will be described. First, a carcass layer is wound around the forming drum 12, and the carcass layer is expanded in a substantially semicircular shape. Thereafter, a belt layer and a tread rubber are attached to the outside of the carcass layer to form a green tire M. Next, the transport device
After operating the hook 18 to move the hook 19 to just before the forming drum 12, the raw tire M formed by reducing the diameter of the forming drum 12
Is transferred from the forming drum 12 to the hook 19. This allows
The raw tire is hooked on the hook 19 and is supported by the hook 19 in an upright state. Next, the raw tire M
Is transported from the forming drum 12 to the tire placing table 21, and is placed on the tire placing table 21 in the posture at the time of carrying, that is, in the upright state (vertically). Next, the transfer device 18 is
And wait above.

Next, the release liquid R is applied to the inner surface of the raw tire M. In this case, first, the switching valve 57 is opened,
The release liquid R stirred by the stirring blade 30 is guided to the switching valve 54 through the connection hose 58. Next, the stepping motor 35 is operated to rotate the pinion 37 to move the rack 34 and the rotating body 49 to one side in the axial direction along the axis of the raw tire M. At this time, the motor 47 is operated to rotate the rotating shaft 48 and the rotating body 49.
Are integrally rotated about these axes.

When the other end 49b in the axial direction of the rotating body 49 reaches a position where it overlaps the other end of the inner surface of the raw tire M (bead toe of the bead portion Mb on the other side), the connection hose 58 and the supply pipe 56 are connected. The switching valve 54 is switched to the communicating position,
The release liquid R is continuously supplied from the supply port 55 to the inner periphery of one end of the rotating body 49 through the connection hose 58 and the supply pipe 56. At this time, the rotating body 49 is moved from one axial end 49a to the other axial end.
It is formed in a thin-walled conical shape that widens as it goes toward 49b.
Since the release liquid R supplied is spread around the axis of rotation of the rotating body 49 and flows toward the other side in the axial direction by centrifugal force while being driven around by the rotation of the rotating body 49, End 49
When it reaches b, it scatters in a vertical plane from the entire circumference of the other end 49b in the radial direction to the outside in the vertical plane due to centrifugal force. Here, since the rotating body 49 is located at the other end of the inner space K of the raw tire M, the scattered release liquid R is applied to the other end of the inner surface of the raw tire. The transfer of the raw tire M from the tire forming apparatus 11 is performed as described above.
Is hung on the hook 19, but in this embodiment, as described above, the coating operation can be performed with the raw tire M in the posture at the time of transportation (vertical state), and therefore, prior to the coating operation. There is no need to change the attitude of the raw tire M, for example, change the attitude from a vertical state to a horizontal state, and the work efficiency is improved. The rotating body in such a state
When the moving means 50 is moved to one side in the axial direction of the raw tire M by the moving means 50, the position to be applied gradually moves to one side.

Here, when the raw tire M is for a radial tire, the side wall portion Ms extends substantially in the radial direction as shown in FIG.
Scatters in a vertical plane in a drop shape,
The application of the release liquid R to the inner surface of Ms becomes insufficient. For this reason, in this embodiment, the rotating body 49 is formed on a straight line that obliquely connects the left and right sidewall portions Ms, here, the upper side of the other sidewall portion Ms and the lower side of the one sidewall portion Ms. When it reaches, the piston 42 is retracted by operating the cylinder 42. Thereby, the inclined plate 44
Pivots clockwise around the tip of the support rod 41,
The rotator 49 is inclined with respect to the raw tire M to an upper position Iz indicated by a virtual line in FIG. As a result, the axis of the rotating body 49 and the axis of the raw tire M intersect at a predetermined angle,
The release liquid R scattered from the other end 49b in the axial direction of 49 passes through a plane obliquely connecting the left and right sidewalls Ms, and is located above and on one side of the sidewall Ms, here the other sidewall Ms. Is applied to the lower inner surface of the side wall portion Ms. Thus, the rotating body inclining means 51 for inclining the axis of the rotating body 49 with respect to the axis of the raw tire M is provided,
The sidewall portion Ms of the raw tire M extending substantially in the radial direction
When the release liquid R is applied to the inner surface of the raw tire M, if the axis of the rotating body 49 and the axis of the raw tire M intersect at a predetermined angle, the side wall portion Ms of the raw tire M extending substantially in the radial direction is formed. The release liquid R can be applied to the inner surface without fail. Here, when the rotating body is a flat disk and the axis of the rotating body is horizontal as described above, the release liquid supplied to the side end face of the rotating body is repelled from the side end face, or It falls down without touching a side end surface, and it is difficult to apply to the inner surface of raw tire M. However, when the rotating body 49 is formed in the shape of a flared thin cone as in this embodiment, and is rotated around the axis, the axis of the rotating body 49 is at any angle, that is, horizontal, vertical, Even if inclined, the release liquid R flows toward the other side in the axial direction while expanding the inner periphery of the rotating body 49, and eventually scatters outward from the other end 49b in the axial direction in the radial direction. Thus, the release liquid R can be applied regardless of the posture of the rotating body 49.

Then, the side wall portion Ms
Is completed, the piston rod 43 of the cylinder 42 is projected, and the rotating body 49 is inclined until its axis is parallel to the axis of the raw tire M. Here, since the inner diameter near the crown Mc portion of the raw tire M is larger than the bead portion Mb and the side wall portion Ms and the application area is wider, the moving speed of the rotating body 49 and the release liquid R from the supply port 55 are increased. If the supply amount is constant, the coating film thickness of the release liquid R in the vicinity of the crown Mc may be thin. Therefore, when the mold release liquid R is applied to the vicinity of the crown Mc, the moving speed of the rotating body 49 is reduced from the time of applying the bead Mb and the side wall Ms, or the supply amount from the supply port 55 is reduced. It is preferable that the thickness of the coating liquid of the release liquid R is made constant by increasing the thickness at the time of application of the part Mb and the side wall part Ms.

When the other end 49b in the axial direction of the rotating body 49 reaches a position overlapping one end (bead toe of the bead portion Mb on one side) of the inner surface of the raw tire M, the stepping motor 35 is rotated in the reverse direction. Retract rack 34. As a result, the rotating body 49 moves toward the other side in the axial direction, and the release liquid R is applied to the inner surface of the raw tire M in an overlapping manner. During such application, the rotating body 49 is moved to the other side wall portion Ms.
Reaches a straight line obliquely connecting the lower side and the upper side of one side wall portion Ms, the piston rod 43 of the cylinder 42
Is projected, and the rotating body 49 is inclined with respect to the raw tire M to a lower position Ik indicated by a virtual line in FIG. As a result, the rotating body
The release liquid R scattered from the other end 49b in the axial direction of 49 is below the other side wall part Ms and one side wall part Ms.
Are respectively applied to the upper inner surfaces of the upper and lower surfaces. In this way, the release liquid R is applied to the entire inner surface of the raw tire M,
When 49 returns to the application start position, the switching valve 54 is switched to a position where the supply pipe 56 is cut off from the connection hose 58.
Thereafter, the operation of the motor 47 and the stepping motor 35 is stopped, and the rotation and the axial movement of the rotating body 49 are stopped.
Next, the raw tire M coated with the release liquid R is transferred from the tire placing table 21 to the raw tire storage table 13 by the transfer device 18, hooked on the support rod 15, and then transferred to the vulcanization step. In this embodiment, since the release liquid R is scattered radially outward from the rotating body 49 by centrifugal force as it is as described above, the release liquid R is applied to the raw tire M. The mold liquid R is not mist-like and scatters around. As a result, the working environment is improved, and the installation of a painting booth and a dust suction device, which were required in the past, is not required. Cost can be reduced.

FIG. 4 is a diagram showing another embodiment of the present invention. In this embodiment, instead of the rotating body tilting means 51 in the above-described embodiment, a raw tire tilting means 62 for tilting the axis of the raw tire M with respect to the axis of the rotating body 49 is provided at the upper end of the tire table 21. ing. Here, the raw tire inclining means 62 has a supporting portion 63 for supporting the raw tire M from below, and an inclined plate 64 one end of which is rotatably connected to the tire mounting table 21, A vertically extending cylinder 66 connected to the center of the cylinder 21 via a bracket 65, and a bracket 68 rotatably connected to the tip of a piston rod 67 of the cylinder 66 and fixed to the other end of the inclined plate 64 It is composed of When the mold release liquid R is applied to the inner surface of the side wall portion Ms of the raw tire M which extends substantially in the radial direction by the rotating body 49, the piston rod 67 of the cylinder 66 is protruded or retracted to remove the raw tire M. It is inclined from the vertical position, and the axis of the rotating body 49 and the axis of the raw tire M intersect at a predetermined angle, that is, the axis of the rotating body 49 and the straight line that diagonally connects the left and right sidewall portions Ms of the raw tire M. Let the perpendicular plane be parallel. As a result, the release liquid R is also applied to the inner side surface of the sidewall portion Ms of the raw tire M extending substantially in the radial direction.
Can be reliably applied.

In the above-described embodiment, the rotating body
Although 49 has a thin conical shape, in the present invention, it may be a trumpet shape or the like that widens from one axial end to the other axial end.

[0022]

As described above, according to the present invention, it is possible to reduce the cost of tire production while preventing the working environment from deteriorating.

[Brief description of the drawings]

FIG. 1 is an entire front view, partially broken, showing an embodiment of the present invention.

FIG. 2 is a front view of a main part in which a part of a coating apparatus is broken.

FIG. 3 is a front cross-sectional view near a rotating body.

FIG. 4 is a front view of another embodiment of the present invention in which a portion near a raw tire inclining means is partially broken.

[Explanation of symbols]

 25 ... Coating device 47 ... Rotating means 49 ... Rotating body 49a ... Axial end 49b ... Axial other end 50 ... Moving means 51 ... Rotating body tilting means 59 ... Supplying means 62 ... Green tire tilting means R ... Releasing liquid M ... Raw tire K… Inside space Ms… Side wall

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location // B29K 21:00 B29L 30:00

Claims (7)

[Claims] 1. A mold release liquid is supplied to an inner periphery of a rotating body which is widened from the one end in the axial direction to the other end in the axial direction while rotating around the axis in the inner space of the green tire. By moving the release liquid in the axial direction of the tire, the release liquid is scattered radially outward from the entire circumference of the other end in the axial direction of the rotating body by centrifugal force and is applied to the entire inner surface of the raw tire. A method of applying a release liquid. 2. The method according to claim 1, wherein when the mold release liquid is applied to the inner surface of the sidewall of the raw tire extending substantially in the radial direction, the axis of the rotating body and the axis of the raw tire intersect at a predetermined angle. The method for applying the release liquid described in the above. 3. The method for applying a release liquid according to claim 1, wherein the application of the release liquid is performed in a vertically placed state where the axis of the green tire is substantially horizontal. 4. A rotating body that widens from one end in the axial direction to the other end in the axial direction, rotating means for rotating the rotating body disposed in the inner space of the raw tire around an axis, Supply means for continuously supplying the release liquid to the inner periphery of the rotating body, and moving means for moving the rotating body in the axial direction of the raw tire, wherein the release liquid supplied to the inner periphery of the rotating body is provided. A mold release liquid coating device, wherein the rotation body is scattered radially outward from the entire circumference of the other end of the rotating body in the radial direction by centrifugal force and is applied to the entire inner surface of the raw tire. 5. A rotating body inclining means for inclining the axis of the rotating body with respect to the axis of the green tire, wherein the mold release liquid is applied to the inner surface of the sidewall of the green tire extending substantially in the radial direction. 5. The release liquid applying apparatus according to claim 4, wherein the axis of the rotating body and the axis of the raw tire intersect at a predetermined angle. 6. A raw tire inclining means for inclining an axis of the raw tire with respect to an axis of a rotating body, wherein a mold release liquid is applied to an inner surface of a sidewall portion of the raw tire extending substantially in a radial direction. 5. The release liquid applying apparatus according to claim 4, wherein the axis of the rotating body and the axis of the raw tire intersect at a predetermined angle. 7. The separation device according to claim 4, wherein the rotating body is arranged so that its axis is substantially horizontal, and the raw tire to which the release liquid is applied is arranged vertically so that its axis is substantially horizontal. Applicator for mold liquid.