JPH0483633A - Device for applying release agent to inner surface of green tire - Google Patents

Abstract

PURPOSE:To obtain a device capable of automatically applying a release agent to the inner surfaces of green tires without rotating the green tires by providing a vertical rotary shaft inside a ring-shaped table, fixing an ejection nozzle for the release agent to the vertical rotary shaft so as to be directed toward the radial direction of said shaft, and providing upper side chucks for holding the upper side beads of the green tires at places above the vertical rotary shaft. CONSTITUTION:Green tires G are put on a ring-shaped table 1 at its elevated position, and lower side chucks 5 are opened outward to fix the lover side beads of the green tires on the ring-shaped table. Then, while the ring-shaped table 1 is lowered, upper side chucks 25 are opened outward to fix the upper side beads of the green tires and, after the table descends by a predetermined distance, it is stopped so that the green tires are fixed while the gap between their upper side and lower side beads is being kept in a vertically opened state. Thereafter, a vertical rotary shaft 12 is rotated, and a release agent is segmentally ejected by an ejection nozzle 15. When the vertical rotary shaft rotates through an angle smaller by a minute angle theta than 360 degrees, the rotation of the vertical rotary shaft is stopped. By this method, the release agent is applied to the inner surfaces of the green tires within a range except portions where reinforcing raw rubber tapes are stuck. Accordingly, the work of the application of the release agent can be automated, and the reliability of the application work is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a release agent coating device for spraying and applying a release agent to the inner surface of a green tire prior to vulcanization.

(Prior art) When attaching a green tire to a vulcanizer, it is easy to insert a bladder into the green tire, and an air exhaust path is formed between the green tire and the bladder. In order to easily remove the bladder from the finished tire, a preforming agent is applied in advance to the inner surface of the green tire described in item 1. In applying the mold release agent, a spray nozzle for the former mold agent is fixedly provided, and the green tire is rotated around this spray nozzle. Therefore, there is a joint between the inner liner and the inner liner on the inner surface of the green tire, and raw rubber tape is pasted to this joint for reinforcement to cover the joint. However, if the above-mentioned mold release agent adheres to the stepped part of the edge of this protrusion, this mold release agent gets caught up in the rubber layer of the tire during vulcanization and creates cracks. During use, these particles grow and cause tire damage.

Therefore, conventionally, in order to prevent the mold release agent from adhering to the stepped portion, the stepped portion was covered by, for example, applying a masking tape along the reinforcing raw rubber tape.

(Problem to be Solved by the Invention) However, conventionally, when applying a mold release agent prior to vulcanization, the masking tape described above is pasted on the inner surface of a green tire, and this masking tape is peeled off after the mold release agent is applied. These operations are troublesome and hinder automation of this process. Moreover, this masking tape caused positional shift or peeled off partially, resulting in poor reliability. Furthermore, in the past, the green tire was rotated with the release agent injection nozzle fixed, so there was a problem that the surface of the green tire was scratched or stained due to contact with the driving roller.

The present invention provides a mold release agent application device for the inner surface of a green tire that can automatically apply a mold release agent to the inner surface of a green tire while avoiding the inner liner application area without rotating the green tire, thereby allowing the application of masking tape. This eliminates the need for work and prevents staining of the green tire surface.

(Means for Solving the Problem) The device for applying a mold release agent on the inner surface of a green tire according to the present invention is provided with a ring-shaped table on which a green tire can be placed horizontally, which is movable up and down, and on which the ring-shaped table is mounted. A lower chuck for holding the lower bead of the green tire on the ring-shaped table is attached so as to be openable and closable, and a vertical rotating shaft that is driven and rotated is provided inside the ring-shaped table, and this vertical rotating shaft is used for mold release. A spray nozzle capable of spraying the agent in a fan shape is fixed in the radial direction,
The present invention is characterized in that an upper chuck for holding the upper bead portion of the green tire is provided above the vertical rotation axis.

(Function) Place the green tire on the ring-shaped table in its raised position, open the lower chuck outward to fix the lower bead of the green tire on the ring-shaped chiffle, and then lower the ring-shaped table while lowering the green tire to the upper side. The chuck is opened outward to fix the upper bead, and after descending a predetermined distance, the tire is stopped to widen the bead spacing of the green tire up and down and fixed.

Thereafter, while rotating the vertical axis of rotation, the spray nozzle sprays the Type 1 agent in a fan shape, and when the axis of vertical axis of rotation has rotated through an angle smaller than 360 degrees by a minute angle θ, the above-mentioned rotation is stopped. The above-mentioned minute angle θ is preferably a slightly wider angle, that is, about 10 to 30 degrees, depending on the width of the reinforcing raw rubber tape at the inner liner joint. In other words, the rotation angle of the vertical rotation axis is preferably 330 to 35
The temperature is set to 0 degrees, and a release agent is applied to the inner surface of the green tire in a range of <330 to 350 degrees, except for the portion where the reinforcing raw rubber tape is pasted.

This mold release agent is sprayed so as to spread in a fan shape within the -plane, and the angle of inclination of the spreading surface of this type agent with respect to the horizontal plane is set depending on the direction in which the reinforcing raw rubber tape is attached, for example. When the raw rubber tape is applied in a vertical direction (radial direction), the nozzle is fixed vertically, and when the raw rubber tape is affixed at an angle of 45 degrees, the nozzle is fixed so as to be inclined by the same 45 degrees. Although this nozzle is fixed so that its center line faces the radial direction of the green tire, it is preferable that the inclination angle with respect to the horizontal direction and the height of the nozzle are adjustable.

(Example) In Fig. 1, G is a green tire, and two air cylinders and a sliding guide are arranged parallel to each other on the lower surface of a ring-shaped table l on which the green tire G is placed.
A plurality of sets of sliding devices 2 are fixed radially, and a lock Fi that engages with the lower bead of the green tire G is attached to the tip of the inward piston rod 3 of the sliding device 2.
4 is fixed, and a lower chuck 5 that can be freely opened and closed is formed by the sliding device 2, the locking plate 4, and the like.

The plurality of sliding devices 2 are fixed on a ring-shaped lifting platform 6 below, and the ring-shaped lifting platform 6 is connected to a plurality of lifting air cylinders 7 vertically installed on the floor below. It is fixed to each upper end of a vertical sliding rod (not shown) disposed between the piston rod 8 and the air cylinder 7 for ascending, and as the piston rod 8 moves up and down, the ring-shaped elevating platform is moved up and down. 6. The lower chuck 5 and the ring-shaped table 1 etc. move up and down vertically, and when lowering the chuck 5, the lower chuck 5 is opened outward, so that the locking plate 4 moves outward and the lower side of the green tire G is moved. It is designed to grip the bead.

A vertical cylindrical bracket 10 is erected at the inner lower side of the ring-shaped table 1, and this cylindrical bracket 1
A vertical rotating shaft 12 is rotatably mounted inside the vertical rotating shaft 11 through bearings 11, 11, and a driving sprocket 13 is fixed to the lower end of this vertical rotating shaft 12. Rotate a predetermined angle slightly smaller than .

The lower end of a vertically long frame-shaped connecting fitting 14 is connected to the upper end of this vertical rotating shaft 12, and a mold release agent injection nozzle 15 is attached to the inside of this connecting fitting 14 by means of a fitting 16 (see Fig. 3). It is installed so that the inclination angle and height relative to the horizontal direction can be adjusted.

On the other hand, an upper shaft 17 is connected to the upper end of this connecting fitting 14 on an extension line of the vertical rotation shaft 12, and one end of this upper shaft 17 is connected to the lower cylindrical portion 2 of the upper table 19 via a bearing 18.
0 is rotatably mounted. And this lower cylinder part 2
A protrusion 20a provided at the lower end of the lower cylindrical bracket 10 and a protrusion 10a provided at the upper end of the lower cylindrical bracket IO are connected by a connecting rod 21 parallel to the vertical rotation axis I2 and the upper axis 17, and the cylindrical bracket 10 is connected to the two-part table. 19 is non-rotatably connected.

On the upper table 19, 2 all sliding devices 22.22 consisting of an air cylinder and a sliding guide are fixed facing each other on the left and right sides of FIG. 1, and 2 & Il sliding devices 22. 22 are fixed facing the front side of the paper and the back side of the paper, and a locking plate 24 is fixed to the tip of each piston rod 23 (see FIG. 2) of the sliding device 22 facing in these four directions. The moving device 22 and the locking plate 24 form an upper chuck 25 that can be opened and closed.

In the above structure, as shown in FIG.
When the is in the upper standby position, this ring-shaped table 1
As shown in Fig. 3, the green tire G is placed on top of the raw rubber tape T for reinforcing the joint La of the inner liner L on the inner surface.
is placed facing the same side as the connecting rod 21. At this time, the lower chuck 5 and the second chuck 25 above it are each closed. Then, the lower chuck 5 under the ring-shaped table 1 shown in (-) is opened, the locking plate 4 comes into pressure contact with the inner surface of the lower bead of the green tire G, and the green tire G is fixed on the ring-shaped table 1. .

Next, the piston rod 8 of the lifting air cylinder 7
is retracted downward, and the green tire G starts lowering via the ring-shaped lifting platform 6, the lower chuck 5, and the ring-shaped table l, and in the middle of this descent, the upper chuck 25 is opened outward. , the locking plate 24 is pressed against the inner surface of the upper bead of the green tire G, and the upper chuck 25 is fixed to the green tire G, and then, as shown in FIG. 2, the middle of the upper and lower beads of the green tire is released from the mold. When the height is approximately equal to that of the agent injection nozzle 15, the lower stage of the ring-shaped lifting platform 6, etc. is stopped, and the green tire G is fixed with the gap between its upper and lower beads widened vertically.

After the green tire G has stopped, the lower vertical rotation shaft 12 of the upper chuck 25 is driven via the drive sprocket 13 at the lower end, and the angle θ is smaller than 360 degrees.
During this time, the mold release agent is injected from the front mold agent injection nozzle 15 toward the inner surface of the green tire G, and as shown in FIG. A molding agent is applied. However, the entire area except for the part at a small angle θ which is slightly wider than the width of the reinforcing raw rubber tape T covering the joint La of the inner liner L (
A mold release agent is applied to the area of angle A). In addition, as shown in FIG. 4, the joint part I of the inner liner L.

If a is tilted and the reinforcing raw material J and tape T are also tilted accordingly, the mold release agent is sprayed from the spray nozzle 15 in a fan shape within a plane parallel to the above-mentioned tilted joint La. be done. In this case, due to the presence of the connecting rod 21 that connects the lower cylindrical part 20 of the upper table 19 and the lower cylindrical bracket 10, there is a part where the mold release agent is not applied, but since that part is narrow, it is not practical. , there is no particular problem.

5 and 6, a crank-shaped connecting rod 31 is rotatably attached in place of the above-mentioned connecting rod 21, and the reinforcing raw rubber tape T is applied only to the part where the release agent is not applied. This was done to prevent this from happening. That is, the lower cylinder part 20 of the upper table 19 and the lower cylindrical bracket NO are connected by a crank-shaped connecting rod 31, and the connecting fitting 1 to which the injection nozzle 15 is fixed is connected.
A rectangular brushing plate 32 is fixed to the lower end of the spray nozzle 15 so as to face the tip of the injection nozzle 15, and as shown in FIG. To apply the reinforcing raw rubber tape T to the tip of the nozzle 15, just before the end of the nozzle 15 faces the part, the connecting rod 31 is pushed out of the fan-shaped spread range α of the mold release agent using the brushing plate 32.

(Effects of the Invention) This invention provides a ring-shaped table on which a green tire is placed, which can be raised and lowered, a lower chuck that can be opened and closed is attached to this ring-shaped table, and a vertical rotation axis is provided at the lower inside of the ring-shaped table. The mold release agent injection nozzle is fixed to the upper part of the mold release agent, and the upper chuck is installed above the lower chuck.The green tire is placed on the ring-shaped table at the 1st raised position, and the lower chuck is opened. The lower bead of the green tire is fixed on a ring-shaped table, and then the upper chuck is opened while lowering the ring-shaped table to fix the upper bead, and after descending a predetermined distance, the bead is stopped and the bead of the green tire is moved up and down. Then, while rotating the vertical axis of rotation, the release agent is injected in a fan shape from the injection nozzle, and when the vertical axis of rotation is rotated by a minute angle θ smaller than 360 degrees, the above rotation is achieved. By stopping the green tire, the release agent can be automatically applied to the remaining area, avoiding the application of reinforcing raw rubber tape that covers a predetermined area on the inner surface of the green tire, that is, the joint area of the inner liner. This eliminates the need for the conventional troublesome work of applying and peeling off masking tape, making it possible to automate this process of applying a mold release agent, and also improving the reliability of the work since the masking tape does not peel off or shift its position. will improve. Further, in this invention, since the green tire is fixed and the release agent injection nozzle is rotated, the surface of the green tire is not soiled or damaged.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the present invention, Fig. 2 is a longitudinal sectional view when the ring-shaped table is lowered, Fig. 3 is a sectional view taken along the line T in Fig. 2,
4 is a sectional view taken along the line IV--IV in FIG. 3, FIG. 5 is a longitudinal sectional view of a modified example, and FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. G Nigeleen Tire, 1: Ring-shaped table, 5: Lower chuck, 12: Vertical rotating shaft, 15: Release agent injection nozzle, 25: Upper chuck. Figure 1 Figure 4 Figure 5

Claims (1)

[Scope of Claims] [1] A ring-shaped table on which a green tire can be placed horizontally is provided so as to be movable up and down, and the lower bead portion of the green tire on the ring-shaped table is held on the ring-shaped table. A lower chuck is attached to the lower chuck so that it can be opened and closed, and a vertical rotating shaft is provided inside the ring-shaped table, and a spray nozzle capable of spraying mold release agent in a fan shape is attached to this vertical rotating shaft in a radial direction. An apparatus for applying a mold release agent to an inner surface of a green tire, characterized in that an upper chuck is provided for holding the upper bead portion of the green tire above the vertical rotation axis.