JP2016210086A - Loader for tire vulcanizer and method of carrying green tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that can always horizontally lift a green tire without obliquely hanging the green tire when lifting the green tire using a loader for a tire vulcanizer.SOLUTION: A loader for a tire vulcanizer comprises a plurality of radially openable and closable paddles circumferentially arranged at predetermined intervals with respect to the center of a main body and paddle claw parts each provided at a lower end of each paddle and extending radially outward. The plurality of paddles are inserted into an inner cavity of a green tire, and then moved radially outward by a predetermined expansion pressure to insert the paddle claw part under an upper bead part of the green tire, whereby the green tire is lifted and carried. An electromagnet is arranged on the paddle claw part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tire vulcanizer loader that lifts a green tire and transports it to a tire vulcanizer in the production of a pneumatic tire, and a method for transporting a green tire using the tire vulcanizer loader.

  In the manufacturing process of a pneumatic tire, a tire vulcanizer is used to horizontally lift a green tire placed on a green tire cradle using a tire vulcanizer loader (hereinafter also simply referred to as a “loader”). After being transported to and loaded in the vulcanizer, vulcanization molding is performed.

  At this time, if the green tire lifted by the loader is lifted diagonally rather than horizontally, the green tire cannot be placed in the center of the mold (bead ring) when the green tire is loaded into the tire vulcanizer. There is a risk that defects such as twist (TWIST) and bradley wreath (BLCR) may occur in the vulcanized tire.

  Therefore, in order to prevent the green tire from being lifted obliquely, a technique for improving the loader and the pedestal of the green tire has been proposed (for example, Patent Document 1).

JP 2013-31944 A

  However, even with the above-described technology, when the green tire is lifted with a loader, the problem of the slanting of the green tire has not been sufficiently solved, and further improvement is required.

  Therefore, the present invention is to provide a technique that can always lift a green tire horizontally without causing the slanting of the green tire when the green tire is lifted using a loader for a tire vulcanizer. And

  The present inventor has conducted intensive studies on the solution of the above problems, and found that the above problems can be solved by the invention described below, and has completed the present invention.

The invention described in claim 1
A plurality of paddles that are arranged at predetermined intervals in the circumferential direction with respect to the center of the main body and that can be opened and closed radially, and paddle claws that are provided at the lower ends of the paddles and extend outward in the radial direction. And inserting the plurality of paddles into the inner cavity of the green tire and then moving the paddle pawls below the upper bead of the green tire by moving the paddles radially outward with a predetermined expansion pressure. A tire vulcanizer loader that lifts and transports the green tire by inserting it into
A loader for a tire vulcanizer, wherein an electromagnet is disposed on the paddle claw portion.

The invention described in claim 2
The tire vulcanizer loader according to claim 1, wherein the number of paddles is 4 to 8.

The invention according to claim 3
3. The tire vulcanizer loader according to claim 1, wherein an upper plate extending outward from the paddle is provided above the paddle claw portion. 4.

The invention according to claim 4
A method for transporting a green tire that lifts and transports a green tire using the loader for a tire vulcanizer according to any one of claims 1 to 3,
A paddle insertion step of inserting the plurality of paddles into the lumen of the green tire by lowering the main body in a state where no magnetic force is generated in the electromagnet;
A green tire holder for holding the green tire by inserting the paddle claw portion under the upper bead portion of the green tire by moving each of the inserted paddles outward at a predetermined expansion pressure. Steps,
A green tire lifting step of lifting the held green tire by raising the main body,
In the green tire lifting step, the expansion pressure of the plurality of paddles is reduced, and the electromagnet is caused to generate a magnetic force so that the upper bead portion of the green tire is pulled toward the paddle claw portion. This is a method for transporting green tires.

  ADVANTAGE OF THE INVENTION According to this invention, when lifting a green tire using the loader for tire vulcanizers, it is possible to provide a technique that can always lift a green tire horizontally without causing slanting of the green tire. .

It is sectional drawing which shows typically the paddle of the loader for tire vulcanizers which concerns on one embodiment of this invention, and the upper bead part of a green tire. It is sectional drawing explaining the lifting of the green tire by the loader for tire vulcanizers shown in FIG. It is a figure which shows the state by which the green tire is lifted with the loader for tire vulcanizers based on the conventional proposal, (a) is the state where the green tire is lifted horizontally, (b) is the green tire diagonally The state where it is suspended is shown. It is a figure explaining the mode of an upper bead part when a green tire is lifted diagonally.

1. Background to the Present Invention (1) Problems of the Prior Art Prior to describing the embodiments of the present invention, the above-described proposal for preventing the slanting of a green tire is why A specific explanation will be given as to whether the problem could not be sufficiently prevented.

  FIG. 3 is a view showing a state in which a green tire is lifted by a loader for a tire vulcanizer based on a conventional proposal, (a) shows a state where the green tire is lifted horizontally, and (b) shows a state where The state where the green tire is slanted is shown. And FIG. 4 is a figure explaining the mode of an upper bead part when a green tire is lifted diagonally.

  As shown in FIG. 3A, in this loader, a plurality of paddles 7 are attached to the lower surface of the main body 1 at a predetermined interval in the circumferential direction, and a green tire 15 is attached to each lower end of the paddle 7. A lower plate 10 (see FIG. 4) is provided as a paddle claw portion for holding the upper bead portion 12.

  In the loader shown in FIGS. 3 and 4, an upper plate 11 extending outward is provided above the lower plate 10 in order to suppress the slanting of the green tire 15. Thereby, the width | variety which pinches | interposes the upper bead part 12 of the green tire 15 can be narrowed, and it becomes easy to lift the green tire 15 horizontally.

  However, even when such a loader is used, the green tire 15 may be lifted obliquely as shown in FIG.

  That is, when the loader holds the green tire 15, each of the paddles 7 moves radially outward as indicated by the arrow in FIG. 4 to expand the upper bead portion 12 of the green tire 15 by a predetermined extension. If the green tire is set in a pressed state before being lifted but there is some trouble, the upper bead portion 12 of the green tire 15 is connected to the upper surface of the lower plate 10 like the paddle 7 on the right side of FIG. Instead of being supported on the side surface of the paddle 7, it may be supported only on the side surface of the paddle 7. In this way, if the upper bead portion 12 is supported only by the side surface of the paddle 7, even if the green tire 15 is lifted, the upper bead portion 12 no longer falls on the lower plate 10, so the green tire 15 is inclined. It will be lifted.

  Such a problem could not be sufficiently prevented even if, for example, an improvement such as providing a centering mechanism for improving the setting accuracy on the cradle on which the green tire before lifting is placed is provided.

(2) Progress of studies leading to the present invention The inventor supported the upper bead portion on the side surface of the paddle when the upper bead portion was supported only on the side surface of the paddle, not on the upper surface of the lower plate 10 and the side surface of the paddle 7. If the upper bead portion can be dropped onto the upper surface of the lower plate, the upper bead portion can be supported by the upper surface of the lower plate and the side surface of the paddle. Various experiments and examinations were carried out.

  As a result, an electromagnet is attached to the lower plate, and the expansion pressure of each of the plurality of paddles is reduced while the green tire is lifted, and the upper bead portion of the green tire is drawn to the lower plate by the electromagnet. As a result, the present invention has been completed.

2. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing a paddle of a tire vulcanizer loader and an upper bead portion of a green tire according to the present embodiment. Yes.

(1) Loader for tire vulcanizer according to this embodiment The loader according to this embodiment is the same as the conventional loader shown in FIG. 3 except that electromagnet 14 is arranged on lower plate 10. It has a configuration.

  That is, the loader according to the present embodiment includes a plurality of paddles 7 that are arranged at equal intervals in the circumferential direction with respect to the center of the main body 1 and that can be opened and closed radially, and are provided at the lower ends of the paddles 7. And a lower plate 10 (see FIG. 1) as a paddle claw portion extending outward.

  The paddle 7 and the lower plate 10 are formed from a single metal plate, and the lower plate 10 is formed by bending the tip of the plate. At this time, the angle between the paddle 7 and the lower plate 10 is set to an acute angle rather than 90 °. In order to suspend the green tire 15 stably, the number of paddles 7 is preferably 4-8.

  Further, similarly to the conventional loader shown in FIG. 3, in order to prevent the green tire 15 from being lifted obliquely, an upper plate 11 extending radially outward is attached above the lower plate 10. Yes.

  Although not shown, the loader main body is provided with opening / closing means for radially opening and closing each of a plurality of paddles arranged in the circumferential direction in a radial direction synchronously. In the present embodiment, the opening / closing means includes an air cylinder and an electromagnetic valve that adjusts the air pressure supplied to the air cylinder.

  As described above, the loader according to the present embodiment is different from the conventional one in that the electromagnet 14 is disposed on the lower plate 10.

  In the present embodiment, a control device (not shown) for controlling the timing for operating the opening / closing means and the electromagnet is provided.

(2) Green Tire Transport Method Next, a green tire transport method using the loader described above will be described.

  First, the main body 1 (see FIG. 3A) is lowered while each of the plurality of paddles 7 is moved inward in the radial direction, and the inside of the green tire 15 placed in a horizontal state is placed. Each paddle 7 is inserted into the cavity. At this time, the power supply of the electromagnet 14 is set to OFF so as not to generate a magnetic force.

  Next, compressed air is supplied to the air cylinder of the opening / closing means, and each paddle 7 is moved radially outward at a predetermined expansion pressure as indicated by the arrow in FIG. 7 is inserted under the upper bead portion 12 of the green tire 15 to hold the green tire 15. Thereafter, the main body 1 (see FIG. 3A) is raised and the green tire 15 is lifted.

  At this time, if there is any trouble in the set state of the green tire before lifting, a portion for supporting the upper bead portion 12 is generated only on the side surface of the paddle 7 as shown in the right side of FIG. The tire 15 is lifted diagonally.

  On the other hand, in the present embodiment, with the green tire 15 being lifted, the electromagnetic valve of the air cylinder is turned off to reduce the expansion pressure radially outward of each paddle 7. Thereby, as shown by the arrow of FIG.2 (b), the force which each paddle 7 presses the upper bead part 12 toward outward is loosened.

  As a result, even if there is a place where the upper bead portion 12 is supported only on the side surface of the paddle 7 when the green tire 15 is lifted, as in the paddle 7 on the right side of FIG. It is expected that the upper bead portion 12 falls and is supported on the lower plate 10 by the weight of the green tire 15 as shown on the right side of FIG.

  However, the air cylinder that adjusts the expansion pressure of each paddle 7 cannot be finely adjusted at positions other than the opening / closing limit position on the equipment. The portion 12 may not fall due to friction with the side surface of the paddle 7.

  On the other hand, in the present embodiment, the electromagnet 14 attached to the lower plate 10 is operated simultaneously with reducing the expansion pressure of the paddle 7. As a result, the upper bead portion 12 made of metal can be drawn to the lower plate 10, so that the upper bead portion 12 that has not fallen only by reducing the expansion pressure of the paddle 7 is shown on the right side of FIG. 7 can be reliably dropped to the lower plate 10.

  Thereby, in all of the plurality of paddles 7, the upper bead portion 12 of the green tire 15 can be supported on the lower plate 10, so even when the green tire 15 is lifted obliquely. The posture of the green tire 15 can be corrected horizontally.

  The green tire 15 can be securely stored in the center of the mold by transporting the green tire 15 to the tire vulcanizer while maintaining the state in which the green tire 15 is suspended horizontally, and the twist ( It is possible to prevent the occurrence of defects such as TWIST and Bradley Lease (BLCR).

  Hereinafter, based on an Example, this invention is demonstrated more concretely.

1. Examples and Comparative Examples (1) Examples A series of processes for vulcanization molding after lifting a size 225 / 50R17 green tire and loading it into a tire vulcanizer using the loader described in the above embodiment. went.

  Further, in the embodiment, as shown in Table 1, when the green tire 15 is lifted, the expansion pressure of each paddle 7 is reduced, and the force with which each paddle 7 presses the upper bead portion 12 outward is loosened. While performing “paddle pressure reduction”, a magnetic force was generated from the electromagnet 14 attached to the lower plate 10 to drop the upper bead portion 12 to the lower plate 10 as shown in FIG.

(2) Comparative Example 1
In Comparative Example 1, a green tire was lifted and transported using a loader in which an electromagnet was not provided on the lower plate as shown in FIGS. 3 and 4, and vulcanized after being loaded into a tire vulcanizer. . Further, paddle pressure reduction was not performed.

(3) Comparative Example 2
In Comparative Example 2, a loader without an electromagnet attached to the lower plate was used, and after the paddle pressure was reduced when the green tire was lifted, it was loaded into a tire vulcanizer and vulcanized.

(4) Comparative Example 3
In Comparative Example 3, a loader having an electromagnet attached to the lower plate as shown in FIG. 1 was used, and the green tire was lifted and transported and loaded into a tire vulcanizer, followed by vulcanization molding. Did not do.

2. Evaluation (1) Incidence of slanting The green tire before being loaded into the tire vulcanizer is visually checked, and the number of times the green tire is tilted to the extent that the operator needs to correct it is measured. The incidence of slanting was calculated based on The calculation results are shown in Table 1.

(2) Defect occurrence rate Check the tire after vulcanization molding visually, measure the number of occurrences of defects such as twists and bradley wreaths caused by slanting of green tires, and generate defects based on the measurement results. The rate was calculated. The calculation results are shown in Table 1.

  From Table 1, it can be seen that in the example, the slanting hanging occurrence rate and the defect occurrence rate are reduced compared to any of Comparative Examples 1 to 3. As a result, when the green tire is lifted, the expansion pressure of each paddle is reduced to loosen the pressing force in the outer diameter direction, and a magnetic force is generated from the electromagnet attached to the lower plate to lower the upper bead portion. It was confirmed that by pulling the plate to the plate, it was possible to prevent the green tire from being lifted in an inclined state and to sufficiently prevent defects in vulcanization molding.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Main-body part 7 Paddle 10 Lower plate 11 Upper plate 12 Upper bead part 14 Electromagnet 15 Green tire

Claims (4)

A plurality of paddles that are arranged at predetermined intervals in the circumferential direction with respect to the center of the main body and that can be opened and closed radially, and paddle claws that are provided at the lower ends of the paddles and extend outward in the radial direction. And inserting the plurality of paddles into the inner cavity of the green tire and then moving the paddle pawls below the upper bead of the green tire by moving the paddles radially outward with a predetermined expansion pressure. A tire vulcanizer loader that lifts and transports the green tire by inserting it into
A loader for a tire vulcanizer, wherein an electromagnet is disposed on the paddle claw portion.   The tire vulcanizer loader according to claim 1, wherein the number of paddles is 4 to 8.   3. The tire vulcanizer loader according to claim 1, wherein an upper plate extending outward from the paddle is provided above the paddle claw portion. 4. A method for transporting a green tire that lifts and transports a green tire using the loader for a tire vulcanizer according to any one of claims 1 to 3,
A paddle insertion step of inserting the plurality of paddles into the lumen of the green tire by lowering the main body in a state where no magnetic force is generated in the electromagnet;
A green tire holder for holding the green tire by inserting the paddle claw portion under the upper bead portion of the green tire by moving each of the inserted paddles outward at a predetermined expansion pressure. Steps,
A green tire lifting step of lifting the held green tire by raising the main body,
In the green tire lifting step, the expansion pressure of the plurality of paddles is reduced, and the electromagnet is caused to generate a magnetic force so that the upper bead portion of the green tire is pulled toward the paddle claw portion. How to transport green tires.

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