JPH03290211A - Green tire loading method for tire vulcanizing machine - Google Patents

Abstract

PURPOSE:To grip upper and lower beads of a green tire securely by means of a mold and position the green tire on a loader by gripping the green tire from the outer periphery by means of the loader, conveying the tire on the center of the mold, inserting and gripping upper and lower bead rings, inserting a bladder into the green tire before closing the top and bottom forces and moving the loader backward. CONSTITUTION:Shoes 2 and 2' of a loader 1 of a tire vulcanizing machine V are set on the outer periphery of a green tire T, and the outer periphery of green tire is gripped and the green tire T is lifted up to the inserting position in a mold. In the state of opening the top force of the vulcanizing machine, the loader 1 is lowered slightly at the center of the mold, the end of a lower bead TB of the green tire T is inserted into a bead ring MB of a bottom force. The top force M is lowered close to the upper surfaces of shoes 2 and 2', the bead surfaces TU of the green tire T are inserted into an upper bead ring MU of the top force. A bladder 3 is lifted up into the green tire, and pressure is applied into the bladder, and the bladder is expanded along the inner periphery of the green tire T to support the green tire T, and the loader 1 is moved back to the position A and the top force is lowered, closed totally and vulcanized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for inserting a green tire into a mold in a tire vulcanizer.

[Conventional technology]

When inserting a green tire into the mold of a tire vulcanizer, before closing the mold, the upper and lower beats 9 of the green tire are centered with respect to the mold, and the upper and lower beads are pushed into the upper and lower bead 9 rings of the mold, respectively. (Patent Application No. 1983-014564)
has been proposed, but in this case, the centering and bead pushing devices are difficult to install in practice, especially for small tires.

Furthermore, due to interference with the pushing device when inserting the bladder, the pushing device is moved backward, resulting in a situation in which the upper bead cannot be gripped (described later).

Therefore, as an alternative (Japanese Patent Application No. 01-019869), a method has been proposed in which the upper bead is first pushed into the upper bead ring, and then the device is lowered to push the lower bead 9 into the lower bead cylinder. There is.

However, in this case, since the upper bead is not supported when the lower bead is pushed in, depending on the tire, there is a risk that the upper bead may fall off from the upper bead ring due to the weight of the tire.

Of course, it is possible to press the upper bead again, but this increases the cycle time, which is not preferable.

[Problem to be solved by the invention]

(1) In order to prevent the upper bead from falling off the upper bead 9 ring, the upper bead 8 is always securely gripped by the upper bead ring from before to when the mold is fully closed. Make sure to support the weight of the raw tire until the end.

(2) When gripping a raw tire with a loader, adjust the position of the loader shoe so that the raw tire is centered on the loader.
Although a positioning mechanism is required, there is no need to adjust it according to the tire diameter.

[Means to solve the problem]

(1) Grip the green tire from the outside with a loader, set it in the center of the mold, and insert the green tire bead into the bead cylinders of the upper and lower molds. In particular, the upper bead is kept inserted into the upper bead ring by inserting a bladder or the like until just before the mold is fully closed, and then the loader is released from the mold, the mold is fully closed, and the Sulfurize.

(2) The loader shoes are opened and closed in synchronization, and when the sensors on both sides of the shoes detect both tires, the shoe closing operation is stopped.

(3) After the upper and lower beads of the green tire are seated on the bead cylinders of the upper and lower molds, while the bladder is inserted into the green tire, the equator line of the tread is displaced downward by the weight of the tread of the green tire. It prevents roaders from shaving and keeps the tire equator line in the desired position.

[Effect]

Position the green tire with a loader and insert it into the mold. Close the upper and lower molds leaving the height of the loader, and use the loader or a separately provided pawl to set the upper and lower beats 8 of the green tire to the upper and lower beats 8.
Push it into the ring, use the bladder to prevent the upper bead from falling off the upper bead ring, then move the loader backward, seal the upper and lower molds, and start vulcanization.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1 to 3.

Figure 1 shows only the parts of a known tire vulcanizer that are relevant to the present invention, including the lower mold (Kaneko Beat 9 ring) MB
In contrast, an upper mold M and an upper bead ring MU that open and close relative to each other are shown, and a bladder 3 is shown in the center of the lower mold MB.

In FIG. 3, the loader 1 has an arm 5 that pivots around a shaft 4 from a standby position A to a mold position B.
A screw 7 rotated by a motor 6 is installed at the tip of the arm 5, and the shoes 2 and 2' engage with the screw 7 with reverse threads, and the motor 6 moves the shoes 2 and 2' onto the arm 5. It has a mechanism that expands and contracts in sync.

At least one sensor 8 is installed inside each of the shoes 2 and 2', and when gripping the green tire T at position A, the motor 6 synchronizes the shoes 2°2'. By closing the tire and stopping the motor 6 when the sensors 8 of both shoes 2 and 2' detect the outer circumference of the tire, the green tire is always positioned at the center of the loader.

Note that when the loader 1 sets the green tire 'r on the mold at position B and moves backward, in this embodiment, since the loader 1 is rotated, a part of the shoe may interfere with the green tire. In order to lower the pressure, the cylinder 9 is arranged so that the tip 10 of the shoe can be moved back to a position 10' around the pin 11. Therefore, for example, if the loader makes a different movement such as linear movement between A + B, these 10 moving mechanisms are not necessary, or they need to be installed on both sides.

Next, the operation of this device will be explained.

The shoe 2.2' of the loader 1 of the tire vulcanizer V is opened as shown by the dotted line in Fig. 2, and the shoe 2.2' of the loader 1 of the tire vulcanizer V is opened as shown by the dotted line in Fig. 2. Set and shoe 2
, 2' are closed, grip the outer periphery of the green tire with a shoe as shown in the lower part of FIG. 2, raise the loader 1, and move it to the insertion position into the mold using the loader 1 as shown by the dotted line in FIG. Lift up the raw tire T. With the upper mold of the vulcanizer open (not shown because it is publicly known), press the mold center heloder 1 at position B in Fig. 3.
The loader 1 is lowered slightly and the lower bead TB of the green tire T is first inserted into the lower bead ring MB of the lower mold, as shown in FIG. Then, put the upper mold M on shoe 2.
, 2' to near the upper surface (position shown in FIG. 1), and insert the upper bead TU of the green tire T into the upper bead ring Mυ of the upper mold. Next, the bladder 3 shown in FIG.
After inflating along the inner circumference and supporting the green tire T, the shoe 2.2' of the loader 1 is opened, the loader 1 is moved back from the B position to the A position, and the upper mold is lowered and fully closed. , begin vulcanization.

The process of inserting the bladder 3 into the green tire T and the process of fully closing the mold after inserting the bladder are well known, and therefore will not be described here.

As another example of inserting the green tire into the mold described above, the green tire is held in the loader shown in FIG.
3-014564 and Japanese Patent Application No. 01-019869, the upper and lower bead parts of the green tire are vertically tilted by 12°13,
It is also possible to crimp the top and bottom beads + IJ song at the same time or one side.

Furthermore, in the above embodiment, the bladder 3 is inserted into the green tire T to support the green tire T before the loader 1 moves backward.
It is also possible to hold the green tire in the upper and lower bead rings by directly inserting fluid into the green tire and inflating the green tire, as in Japanese Patent Application No. 59-123897 filed by Zakura Doi Tire Ant 9 Rubber Company.

Furthermore, when the pawl device 13 is provided instead of putting the loader 1 into the mold, lowering the loader 1, and inserting the lower bead into the lower bead ring as in the above embodiment, the lowering operation of the loader is performed as follows. It is also possible to press the lower bead into the lower bead ring using the pawl 13 instead.

Furthermore, the loader 1 is raised to the upper mold, and the pawl device 12 is used to
After the upper bead is set in the upper bead ring, the mold can be lowered together with the loader, and after the lower bead is pushed into the lower bead ring, the loader can be moved backward.

〔Effect of the invention〕

In a tire vulcanizer, the green tire is gripped from the outer periphery by a loader, the green tire is carried onto the center of the mold, the upper and lower molds are brought close together, and the upper and lower beats 9 of the green tire are respectively placed into the upper and lower beads. By inserting and gripping the bladder into the ring, inserting the bladder into the green tire before the upper and lower molds are fully closed, and then retracting the loader from the mold, the following effects can be obtained.

(1) It is possible to enter the vulcanization process while the upper and lower beads of the green tire are always securely held in the mold, and it is possible to vulcanize tires of excellent quality.

(2) The green tire can be positioned on the loader without adjusting the tire dimensions.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a state in which a tire according to an embodiment of the present invention is inserted into a mold, FIG. 2 is a diagram showing the operation of a loader gripping a raw tire, and FIG. 3 is a detailed plan view of the loader. M...Upper metal W MU...Upper bead ring Ms...Lower die 3...Bladder 1 flash

Claims (1)

[Claims] In a tire vulcanizer, a loader grips the green tire from the outer periphery, carries the green tire onto the center of the mold, brings the upper and lower molds closer together, and inserts and grips the upper and lower beads of the green tire into the upper and lower bead rings, respectively. A green tire loading method for a tire vulcanizer, characterized by inserting a bladder into the green tire before fully closing the upper and lower molds, and then retracting the loader from the mold.