JP2016215516A - Loader and method for carrying green tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loader and a method for carrying a green tire, by which occurrence of vulcanization failure in the green tire can be reduced by suppressing development of scratches or acceleration of degradation in a bladder when a chuck is released after shaping the green tire by using the bladder, and exchanging times of the bladder can be reduced.SOLUTION: When a green tire is to be held, a rotary chuck is rotated downward to descend an inner end, and then a horizontal chuck is horizontally and radially moved outward so as to support a bead of the green tire to hold the tire. When the green tire is to be released, the rotary chuck is rotated upward to elevate the inner end, then the horizontal chuck is horizontally and radially moved inward so as to release the bead of the green tire to release the tire, as well as the chuck is restored to an initial position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a loader used when supplying a green tire to a tire vulcanizer and a method for transporting the green tire.

  When vulcanizing a green tire, a molded green tire is held by a loader and supplied to a predetermined position of a tire vulcanizing apparatus (for example, Patent Document 1).

  4A and 4B are side views schematically showing how a conventional loader holds a green tire. FIG. 4A shows a state before holding the green tire, and FIG. 4B shows a state after holding the green tire. As shown in FIG. 4A, first, while lowering the main body portion 10 of the loader, the plurality of chucks 2 arranged on the lower surface of the main body portion 10 are horizontally moved radially outwardly to thereby move the green tire 3. The chuck 2 is inserted into the lumen. Thereafter, the chuck 2 is horizontally moved outward, and the chuck 2 is inserted into the lower portion of the bead portion 4, whereby the green tire 3 is taken out horizontally and out of the center as shown in FIG. 4 (b). Then, the green tire 3 gripped thereafter is supplied to a predetermined position of the tire vulcanizing apparatus.

JP 2009-137243 A

  However, tire vulcanizers that use mushroom-type bladders and tire vulcanizers that have a distance between the fixing ring of the bladder and the bead portion of the green tires are used to supply green tires using the loader described above. In such a case, the following problems may occur when the loader releases the green tire after shaping by the bladder.

  FIG. 5 is a cross-sectional view schematically showing a state in which a conventional loader releases a green tire after completion of shaping by a bladder. FIG. 5A shows a state before releasing the green tire when shaping is completed. It shows how the green tires are released.

  As shown in FIG. 5 (a), after shaping the green tire 3 with the bead portion 4 supported by the chuck 2 by the bladder 5, when trying to release the chuck 2 from the bead portion 4 of the green tire 3, FIG. ), The chuck 2 presses the bladder 5 which is bent and protrudes from the bead portion 4 of the green tire 3, and the chuck 2 may damage the surface of the bladder 5. Even when the chuck 2 is not damaged, if the chuck 2 presses the bladder 5 many times, a high load is applied to the bladder 5 and the deterioration of the bladder 5 may be promoted. The acceleration of the occurrence of such scratches and deterioration not only ruptures the bladder during vulcanization, leading to poor vulcanization of the green tire, but also requires the bladder to be replaced early with the planned number of uses. This will increase the cost.

  Accordingly, the present invention reduces the occurrence of poor vulcanization of the green tire by suppressing the generation of scratches and deterioration in the bladder when releasing the chuck after shaping the green tire using the bladder. It is an object of the present invention to provide a loader and a method for transporting a green tire that can reduce the number of times the bladder is replaced.

  The inventor has intensively studied to solve 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 loader for holding a green tire by opening a plurality of chucks arranged on the lower surface of the main body radially outward and transporting the green tire to a tire vulcanizing device,
Control means for controlling the operation of the chuck is provided,
The chuck includes a plurality of horizontal chucks that are arranged radially with respect to the center of the main body and move horizontally in a radial direction, and a rotary chuck having one end rotatably connected to an outer end of the horizontal chuck. Has
The control means includes
When holding the green tire, the bead of the green tire is moved by rotating the rotary chuck downward and lowering the inner end, and then horizontally moving the horizontal chuck outward in the radial direction. Holding the green tire supporting the part,
When releasing the green tire, the rotary chuck is rotated upward to raise the inner end, and then the horizontal chuck is horizontally moved inward in the radial direction to To release the bead and release the green tire and return the chuck to the initial position,
The loader controls the operation of the chuck.

The invention described in claim 2
A detection sensor for detecting the green tire is provided;
In response to the detection of the green tire by the detection sensor, the control means controls the operation of the chuck so as to start the operation of supporting the bead portion of the green tire by the rotating chuck and the horizontal chuck. The loader according to claim 1.

The invention according to claim 3
A method for transporting a green tire using the loader according to claim 1 or 2 to transport the green tire to a tire vulcanizing device,
After rotating the rotating chuck downward and lowering the inner end, the horizontal chuck is horizontally moved outward to support the bead portion of the green tire and hold the green tire. Holding step to
A transporting step for transporting the held green tire to the tire vulcanizing device;
After rotating the rotating chuck upward to raise the inner end portion, the horizontal chuck is moved inward in the radial direction to release the bead portion of the green tire to And a releasing step of releasing the chuck and returning the chuck to an initial position.

  According to the present invention, when releasing a chuck after shaping a green tire using a bladder, the occurrence of poor vulcanization of the green tire is reduced by suppressing the generation of scratches and deterioration in the bladder. In addition, it is possible to provide a loader and a method for transporting a green tire that can reduce the number of times of replacing the bladder.

It is sectional drawing which shows typically a mode that the loader which concerns on one embodiment of this invention hold | maintains and releases a green tire. It is sectional drawing explaining an example of the operation mechanism of the rotation chuck in the loader concerning one embodiment of the present invention. It is an expanded sectional view showing a bead part of a green tire typically. It is a side view which shows a mode that the conventional loader hold | maintains a green tire. It is sectional drawing which shows a mode that the conventional loader releases a green tire after the shaping by a bladder is completed.

Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

1. Basic Configuration of Loader According to this Embodiment First, an outline of the loader according to this embodiment will be described. FIG. 1 is a cross-sectional view schematically showing how the loader according to the present embodiment holds and releases a green tire, (a) shows the loader before holding the green tire, and (b) shows the loader. (C) is a state when the green tire held by the loader is shaped by the bladder, and (d) is a view when the chuck is released after shaping.

  In the loader according to the present embodiment, a plurality of chucks are radially arranged with respect to the center of the main body portion 10 on the lower surface of the main body portion 10 as in the conventional loader. However, each chuck is composed of a horizontal chuck 7 and a rotary chuck 9, and the rotary chuck 9 is connected by a connecting portion 8 fixed to the horizontal chuck 9, which is different from the conventional loader.

  In the present embodiment, a plurality of horizontal chucks 7 are arranged radially with respect to the center of the main body 10 in parallel with the lower surface of the main body 10.

  The rotating chuck 9 is connected to the horizontal chuck 7 by a connecting portion 8 provided at an outer end portion of each horizontal chuck 7, and is connected so as to freely rotate around the connecting portion 8. A bead holding portion 11 that holds the bead portion 4 of the green tire 3 is provided at the inner end of the rotating chuck 9 and rotates in accordance with the rotation of the rotating chuck 9.

  The horizontal chuck 7 and the rotary chuck 9 are respectively connected to an actuator (not shown), and the horizontal chuck 7 can be moved horizontally or the rotary chuck 9 can be rotated by operating the actuator.

  The loader according to the present embodiment is provided with a detection sensor that detects a green tire and a control unit that controls the operation of the chuck, although not shown.

2. Next, a method for supporting and transporting a green tire using a loader will be described.

  As shown in FIG. 1A, in the loader before holding the green tire, the horizontal chuck 7 is positioned on the center side of the loader 1 (hereinafter referred to as “closed” state), and the rotary chuck 9 is the loader 1. Is in a state of being nearly horizontal (hereinafter referred to as an “up” state).

  Next, when a detection sensor (not shown) detects the position of the bead portion 4 of the green tire 3, the control means operates the actuator to control the operations of the horizontal chuck 7 and the rotary chuck 9.

  Specifically, as shown in FIG. 1B, the actuator is operated, and first, the rotating chuck 9 is rotated downward (hereinafter referred to as a “down” state) around the connecting portion 8 to obtain a horizontal chuck. 7 is opened at a predetermined acute angle. Next, in this state, the horizontal chuck 7 is horizontally moved radially outward (hereinafter referred to as “open” state). Thus, the green tire 3 can be supported by holding the bead portion 4 of the green tire 3 by the bead holding portion 11 of the rotating chuck 9.

  Thereafter, the supported green tire 3 is supplied to the tire vulcanizing apparatus by being transported to a tire vulcanizing apparatus (not shown), and is shaped by the bladder 5 as shown in FIG.

  After the shaping by the bladder 5 is completed, the control means operates the actuator to release the chuck from the green tire 3 as shown in FIG.

  Specifically, the actuator is operated to return the rotary chuck 9 to the raised state. At this time, since the rotating chuck 9 returns to the raised state by rotating upward, the bead holding portion 11 of the rotating chuck 9 is released from the green tire 3 along the surface of the bladder 5.

  Thus, in the present embodiment, when releasing the chuck, the chuck is moved along the surface of the bladder rather than moving the chuck in the horizontal direction as in the conventional loader. The chuck can be released without pressing the surface. As a result, there is no risk of damaging the surface of the bladder 5, and since the heavy load is not applied to the bladder 5, the deterioration of the bladder 5 can be prevented from being accelerated. It is possible to reduce the occurrence of poor sulfur and reduce the number of bladder replacements.

  As a further effect, since the possibility that the chuck of the loader and the fixing ring of the bladder are in contact with each other is reduced as compared with the conventional case, it is possible to expect an effect of reducing the wear of the chuck and the fixing ring.

  The released chuck is then returned to the initial state by operating the actuator to horizontally move the horizontal chuck 7 inward in the radial direction and returning it to the closed state to prepare for the support of the next green tire. .

3. Next, the operation mechanism of the rotating chuck in supporting the green tire by the loader will be described in more detail.

  FIG. 2 is a cross-sectional view for explaining an example of the operation mechanism of the rotary chuck in the loader according to the embodiment of the present invention. The chuck 6 includes a horizontal chuck 7, a rotary chuck 9, an operation slide disk 12 for the rotary chuck, a rotation support portion 14 (an example of the connection portion 8 in FIG. 1), a ball bearing 13, and an actuator (not shown). .

  The rotary slide working slide 12 is disposed in contact with the upper side of the horizontal chuck 7, and the rotary chuck working slide 12 and the horizontal chuck 7 are respectively connected to actuators (not shown).

  The rotary chuck working slide 12 is connected to the outer end of the rotary chuck 9 through two ball bearings 13 at its outer end. A rotation support portion 14 is fixed to the horizontal chuck 7, and the rotation chuck 9 is rotatably supported by the rotation support portion 14.

  In this state, as shown in FIG. 2A, when the operating slide 12 of the rotary chuck 9 moves horizontally in the direction of the arrow, that is, inward, the rotary chuck 9 uses the rotation support portion 14 as a fulcrum. By rotating downward, the bead holding portion 11 provided at the inner end of the rotary chuck 9 is lowered, and the rotary chuck 9 is lowered. In this state, by horizontally moving the horizontal chuck 7 outward in the radial direction, the bead portion of the green tire can be held by the bead holding portion 11 of the rotary chuck 9 to support the green tire.

  On the other hand, as shown in FIG. 2B, when the operating slide 12 moves horizontally in the direction of the arrow, that is, outward, the rotating chuck 9 rotates upward with the rotation support portion 14 as a fulcrum. The bead holding part 11 provided at the inner end of the rotary chuck 9 is raised and the rotary chuck 9 is raised. Thereby, the green tire can be released from the rotating chuck 9. Thereafter, the chuck can be returned to the initial state by horizontally moving the horizontal chuck 7 inward in the radial direction.

  FIG. 3 is an enlarged sectional view of the bead portion 4 of the green tire, and 15 indicates the thickness of the bead portion 4. In the present embodiment, the operation stroke of the rotary chuck 9 is relative to the thickness 15 of the bead portion from the viewpoint of reliably holding the bead portion 4 by the bead holding portion 11 provided at the inner end portion of the rotary chuck 9. It is preferably +10 mm or more. At this time, since the bead holding part 11 of the rotating chuck 9 preferably supports the green tire so as to cover the tip of the bead part 4, the bead holding part 11 has an angled or rounded shape. It is preferable that the length of the bead holding portion 11 is equal to or less than the circumferential length L of half the arc when the bead portion 4 of the green tire 3 is an arc, from the viewpoint that the green tire is not damaged. To preferred.

  The cross-sectional shapes of the chucks, that is, the horizontal chuck 7 and the rotary chuck 9 are not particularly limited, but the green tire 3 and the bladder 5 have no edge with respect to the green tire 3 on the surface contacting the green tire 3 and the bladder 5. This is preferable from the viewpoint of preventing scratches from occurring.

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

1. Preparation of Specimen (Evaluation Tire) First, green tires of the types shown in Examples 1 to 4 in Table 1 and Comparative Examples 1 to 4 in Table 2 were prepared.

  Next, each produced green tire was chucked and lifted using a loader shown in Table 1 and Table 2, supplied to a tire vulcanizer, and shaped using a bladder shown in Table 1 and Table 2. . After shaping, the loader chuck was released and vulcanized.

2. Evaluation (1) Evaluation Method The number of bladders used in each example and comparative example was counted. Then, the number of bladder replacements that occur due to damage due to friction between the chuck and the bladder is counted as the number of defective occurrences, and the value calculated by dividing this by the number of vulcanizations is the vulcanization failure rate, `` good '', `` Evaluation was made based on “possible” and “impossible” Each of the above judgments is “good” if the defective vulcanization rate is 0.010% or less, “good” if the defective vulcanization rate is more than 0.010% and 0.020% or less. If the defect rate exceeded 0.020%, it was judged as “impossible”.

(2) Results Tables 1 and 2 show the evaluation results. In Tables 1 and 2, the number of vulcanized green tires used in each example and the defective rate of vulcanized tires, the number of bladders and the defective rate of bladders (occurrence rate of damaged bladder) are also shown. It is described.

  From Table 1 and Table 2, comparing Example 1 and Comparative Example 1, which differ only in the loader, Example 2 and Comparative Example 2, Example 3 and Comparative Example 3, Example 4 and Comparative Example 4, It can be seen that the defective vulcanization rate is decreasing.

  In addition, the number of bladders used and the bladder defect rate are also reduced, and it can be seen that the frequency of replacing the bladder can be reduced by using the loader of the present embodiment.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above 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 Loader 2, 6 Chuck 3 Green tire 4 Bead part 5 Bladder 7 Horizontal chuck 8 Connection part 9 Rotation chuck 10 Main part 11 Bead holding part 12 Rotary chuck action slide board 13 Ball bearing 14 Rotation support part 15 Thickness L of bead part Circumference

Claims (3)

A loader for holding a green tire by opening a plurality of chucks arranged on the lower surface of the main body radially outward and transporting the green tire to a tire vulcanizing device,
Control means for controlling the operation of the chuck is provided,
The chuck includes a plurality of horizontal chucks that are arranged radially with respect to the center of the main body and move horizontally in a radial direction, and a rotary chuck having one end rotatably connected to an outer end of the horizontal chuck. Has
The control means includes
When holding the green tire, the bead of the green tire is moved by rotating the rotary chuck downward and lowering the inner end, and then horizontally moving the horizontal chuck outward in the radial direction. Holding the green tire supporting the part,
When releasing the green tire, the rotary chuck is rotated upward to raise the inner end, and then the horizontal chuck is horizontally moved inward in the radial direction to To release the bead and release the green tire and return the chuck to the initial position,
A loader for controlling the operation of the chuck. A detection sensor for detecting the green tire is provided;
In response to the detection of the green tire by the detection sensor, the control means controls the operation of the chuck so as to start the operation of supporting the bead portion of the green tire by the rotating chuck and the horizontal chuck. The loader according to claim 1. A method for transporting a green tire using the loader according to claim 1 or 2 to transport the green tire to a tire vulcanizing device,
After rotating the rotating chuck downward and lowering the inner end, the horizontal chuck is horizontally moved outward to support the bead portion of the green tire and hold the green tire. Holding step to
A transporting step for transporting the held green tire to the tire vulcanizing device;
After rotating the rotating chuck upward to raise the inner end portion, the horizontal chuck is moved inward in the radial direction to release the bead portion of the green tire to And a releasing step of releasing and returning the chuck to an initial position.

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