JPS6234524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bladder insertion method for a tire vulcanizer and improvements to the tire vulcanizer.

In a tire vulcanizer, a rubber bag called a bladder is inserted into the tire in order to seal the heat medium for vulcanization (hot water, steam) inside the tire.

Conventionally, this bladder was inserted into the tire,
As shown in FIG. 1, the ascending and descending positions of the bladder were set using a spacer a for setting an ascending point and a spacer b for setting a descending point.

For this reason, when changing the bladder height for each tire size, it is necessary to replace the spacer, which is very time-consuming and causes the vulcanizing heat medium to enter the hydraulic cylinder C, causing the seal to tighten. There was a problem that damage such as d was likely to occur, and maintenance efforts were increased.

In addition, a bladder f is inserted into the tire and the tire is inflated and shaped using steam pressure (this process is called shaping), and the upper ring e is lowered from above the tire with the lower end of the bladder f fixed. Since the bladder f is lowered in this manner, the bladder f tends to be inserted vertically asymmetrically into the tire, which tends to cause variations in tire quality.

The present invention has been proposed in view of the above-mentioned points, and it is possible to shape the tire by inserting a bladder into the tire vertically symmetrically, and also to easily set the elevation position of the bladder without using a spacer. It is an object of the present invention to provide a method for inserting a bladder into a curing machine and a tire curing machine.

In the method of the present invention, the upper and lower clamp fittings that clamp the upper and lower ends of the bladder inserted into the tire are synchronously raised and lowered in opposite directions to extend the bladder. Raise and lower the upper and lower clamps synchronously until they are at the center of the
The bladder is inserted into the tire by raising and lowering the lower clamp fittings in opposite directions synchronously until they are opened at a predetermined distance. Since only the metal fitting is lowered so that it comes into close contact with the lower clamp metal fitting, the bladder can be positioned at the center of the tire and inserted symmetrically upward and downward into the tire for shaping, so the relationship between the tire and bladder can be adjusted. The quality of the tire can be improved without trapping air in between.

The device of the present invention is a device directly used to carry out the method of the present invention described above, and is a device that synchronously raises and lowers upper and lower clamp fittings that clamp the upper and lower ends of a bladder inserted into a tire in opposite directions. It is characterized by having a clamp metal lifting mechanism, a means for detecting the positions of the upper and lower clamp metal fittings, and a means for raising and lowering only the upper clamp metal fittings independently. According to
The bladder is positioned at the center of the tire and is inserted symmetrically upward and downward into the tire by means that can be raised and lowered in synchronization in mutually opposite directions at all times, and that allows only the detection means and the upper clamp fitting to be raised and lowered independently. Since the bladder can be shaped and shaped, there is no need for a spacer to set the elevation position when inserting the bladder, and various problems caused by using a spacer can be solved.

Hereinafter, the present invention will be explained based on illustrated embodiments.

In FIG. 2, 1a and 1b are an upper mold and a lower mold divided into upper and lower halves, the lower mold 1b is fixed to the base 2 of the tire vulcanizer, and the upper mold 1a is a publicly known mold (not shown). The mechanism moves the lower mold 1b up and down.
It is installed so that it can be moved away from the 3 is a bladder, and upper and lower ends are upper clamp fittings 5, respectively.
and is held by a lower clamp fitting 6.
4 is a tire, which is pressed to the upper and lower molds 1a and 1b through the bladder 3 by a heat medium for vulcanization (in most cases pressurized hot water or steam) introduced into the interior of the bladder 3, and is molded and vulcanized. . The upper clamp fitting 5 is fixed to a post 7, and the post 7 is raised and lowered by a hydraulic cylinder 8. A male thread 8a is provided on the outer periphery of the hydraulic cylinder 8, and this male thread 8a engages with a female thread 9a provided on the inner periphery of the screw 9. The lower clamp fitting 6 is fixed to a hub 10, and a cylinder 11 is attached to the hub 10.
is fixed. A female thread 11a is provided on the circumference of the cylinder 11, and this female thread 11a is engaged with a male thread 9b provided on the outer periphery of the screw 9. The screw 9 has a gear 12 at its lower end, and is rotatably held with respect to the base 2 via a bearing 13. The gear 12 is driven by a pinion 15 by a drive device 14 consisting of an electric motor, a hydraulic motor, etc.
It is designed to be rotationally driven through. In addition, the female thread 9a and male thread 9b of the screw 9
are screws in opposite directions, so that by rotating the screw 9 by the drive device 14, the cylinder 11 and the hydraulic cylinder 8 can always be raised and lowered by the same distance in opposite directions. ing. Further, a small gear 16 meshes with the pinion 15 and rotates an angle detector 18 via a reducer 17.
As a result, the vertical distance between the cylinder 11 and the hydraulic cylinder 8 is converted into an angle by the angle detector 18 and detected.
The cylinder 11 and the hydraulic cylinder 8 can be positioned using a setting device. Furthermore, although the lower bead ring 19 is normally seated on the lower mold 1b, it can be raised via the sleeve 20 by the cylinder 21.

Next, the operation will be explained with reference to FIGS. 3 and 4.

First, when the screw 9 is rotated by the drive device 14 via the pinion 15 and the gear 12, the third
As shown on the left side of the figure, the lower clamp fitting 6 descends via the cylinder 11 and the hub 10, the upper clamp fitting 5 rises via the hydraulic cylinder 8 and the post 7, and then the post 7 is moved by the hydraulic cylinder 8. By pushing it to the upper limit, the upper clamp fitting 5 rises and the bladder 3 is expanded into a cylindrical shape. Next, the raw tire 4 before vulcanization is fitted onto the outer periphery of the lower beat ring 19 by a known means (not shown), and then the screw 9 is rotated in the opposite direction to the above, whereby the cylinder 11, The lower clamp fitting 6 rises via the hub 10, reaches the "c" position shown on the right side of FIG. 3, and is positioned at the center of the green tire 4. At this time, from the center a-a of the raw tire 4 to the center b of the normal bladder 3
-b is above, and the upper and lower clamp fittings 5 and 6 are designed to always move up and down the same distance in opposite directions, so when the lower clamp fitting 6 reaches the "c" position, the upper clamp fitting 5 has descended only to the vicinity of the "d" position. Here, when the post 7 is lowered by the hydraulic cylinder 8, the upper clamp fitting 5 is lowered to the "c" position, the upper and lower clamp fittings 5 and 6 are in close contact with each other, and the bladder 3 is attached to the raw tire 4.
is positioned at the center of Thereafter, when the screw 9 is rotated in the opposite direction again, the upper and lower clamp fittings 5 and 6 are raised and lowered by the same distance in opposite directions, as shown by the solid line on the right side of FIG. It is inserted vertically symmetrically inside. In order to smoothly insert the bladder 3 into the green tire 4 during the above-mentioned bladder lifting and lowering process, the bladder 3 is slightly inflated with low steam pressure. When the bladder 3 has been inserted into the green tire 4 in this way, a specified steam pressure is supplied into the bladder 3 to sufficiently expand and mold the tire, and then the upper mold 1a is closed and the bladder 3 is heated. Supply a heat medium for curing and vulcanize the tire. When the upper mold 1a is closed, the upper clamp fitting 5 is pushed down by the closing force of the upper mold by a hydraulic cylinder. After vulcanization,
After opening the upper mold 1a and stretching the bladder 3 up and down as described above, when the lower bead ring 19 is raised by the cylinder 21 as shown in FIG.
The tire 4 is peeled off from the lower mold 1b, lifted above the bladder 3, and taken out of the vulcanizer by appropriate means.

As is clear from the above, according to this embodiment, the following effects can be obtained.

(1) The position of the bladder can be set extremely easily by using a setting device or the like without using a spacer as in the conventional case. Therefore, it does not take much time to replace spacers, etc., and adjustment for each tire size becomes easy.

(2) Since no spacer is used, there is no intrusion of vulcanizing heat medium into the cylinder, extending the life of the cylinder, packing, etc., and reducing maintenance.

(3) Since the bladder can be positioned at the center of the green tire to perform expansion molding of the tire, air is not trapped between the bladder and the tire, and tire quality can be improved.

Note that although the vertical distances of the upper and lower clamp fittings are detected by converting them into angles using an angle detector, it goes without saying that various detection means other than the angle detector can be considered.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional device, FIG. 2 is a sectional view showing an embodiment of the present invention, and FIGS. 3 and 4 are sectional views for explaining the operating state. 3: Bladder, 4: Tire, 5: Upper clamp fitting, 6: Lower clamp fitting, 7: Post, 8: Hydraulic cylinder, 8a: Male thread, 9: Screw, 9
a: Female thread, 9b: Male thread, 10: Hub, 1
1: Cylindrical, 11a: Female thread, 12: Gear, 1
4: Drive device, 15: Pinion.

Claims (1)

[Claims] 1. The upper and lower clamp fittings that clamp the upper and lower ends of the bladder inserted into the tire are moved up and down in opposite directions synchronously to extend the bladder, and then the lower clamp fittings are moved up and down in opposite directions. Raise and lower the upper and lower clamps synchronously until they are at the center of the raw tire, then lower only the upper clamp until it comes into close contact with the lower clamp, then move the upper and lower clamps synchronously in opposite directions. A method for inserting a bladder into a tire vulcanizer, which comprises inserting the bladder into the tire by raising and lowering the bladder until it opens at a predetermined interval. 2. A clamp metal lifting mechanism that synchronously raises and lowers upper and lower clamp metal fittings that clamp the upper and lower ends of the bladder inserted into the tire in opposite directions;
A tire vulcanizing machine characterized by being provided with means for detecting the positions of upper and lower clamp fittings, and means for independently raising and lowering only the upper clamp fittings.