JPS5944985B2 - Drainage device for bags for curing retreaded tires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bag used in tire retreading, a means for vulcanizing (thereby retreading) the tread surface of a tire when the tread surface is worn out. The purpose of the present invention is to provide a device that can easily, safely, and quickly remove water accumulated inside the device.

In the conventionally known vulcanizing means, ie, the vulcanizing means shown in FIG. 1, hydraulic power is often accumulated within the bag 8.

That is, Fig. 1 shows a conventionally known vulcanizing means (in this case, 1 is a watch case, the overall shape is donut-shaped, there is a steam jacket 2 inside, and an aluminum material provided inside). The structure is configured to enable heating of the mold 4 formed by.

This whole mold 4 is used to mold the retreaded tire 6 placed inside by heating and vulcanizing it, and during molding, a doughnut-shaped bag 7 is inserted inside the mold 4, and heated steam is passed through the mold 4 to mold the retreaded tire 6. This allows the tire 6 to be heated from the inside as well.

Reference numeral 9 indicates a steam injection valve through which steam and auxiliary compressed air are pressurized.

Reference numeral 10 denotes an inner ring, which is used to press down the inner peripheral portion of the retreaded tire so that it does not protrude in the radial direction.

When vulcanization is performed by the above methods,
The heated steam inside the bag cools and becomes water droplets that accumulate inside the bag.As a result, the weight of the bag increases during subsequent operations such as carrying around. Otherwise, uneven heat conduction will occur.Also, if heated steam is inserted through the press-in valve while water remains in the bag, conversely, water heated from inside, that is, heat There are various disadvantages such as water spraying towards the worker and inducing burns.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide a device that can drain water from a bag extremely easily, quickly, and safely.

Hereinafter, FIG. 3 of the drawing showing an embodiment of the present application will be explained.

A washer 13 is integrally fixed to the base of the steam press-in valve 9, and the washer 13 is embedded in the inner peripheral edge 7a of the bag 7 as shown in the figure.

Further, a cylindrical body 12 is connected to the press-fit valve 9 via a connecting screw 11.

This cylindrical body 12 is used to prevent rubber that has collapsed from the inner surface of the bag 7 from clogging the inside of the steam injection valve 9 when the bag 7 is used for a long period of time.

The shape of the outer surface of the inner peripheral edge 7a of the bag 7 may be formed into a shape corresponding to the inner surface shape of the tire bead other than the round shape shown in the figure.

The cross-sectional shape of the bag 7 may be formed into a circular pond shape as shown in the figure.

Next, '16 shows a water draining device.

In the main body 17 of the water draining device 16, 18 is a hollow base, 19 is a connector connected to the base 18 via a connecting screw 20, and a connection port 21 is provided at the lower end of the connector.

Further, a connecting thread 22 is formed on the outer circumferential surface of this connecting port 21 to be screwed into a female thread 14 formed on the inner surface of the steam injection valve 9.

Reference numeral 23 denotes a connecting device connected to the base body 18 via a connecting screw 24, so that a well-known air chuck can be connected thereto.

25 indicates its pneumatic inlet. This air pressure inlet 2
5 may be equipped with a well-known valve core.

A packing holder 26 is connected to the base 18 via a connecting screw 27, and a receiving surface 29 for the packing is formed on the upper side of the packing holder.

30 shows a gasket placed on the receiving surface 29.

This packing 30 is made of an elastic material such as rubber.

Reference numeral 31 indicates a packing presser screwed onto the holder 26, and 32 indicates its presser surface.

Next (this 33 is a drain pipe formed in a cylindrical shape, and the through hole 19a in the connector 19 and the through hole 28 in the packing holder 26)
Insert it loosely.

By pressing the inner circumferential surface of the rubber gasket 30 against the surface of the drain pipe 33, the internal space of the base body 18 is prevented from communicating with the outside of the base body 18 through the through hole 28. .

Rubber gasket 30 for drain pipe 33 in this case
The pressure contact is carried out by sandwiching the packing 30 between the pressing surface 32 of the packing holder 31 and the receiving surface 29 of the packing holder 26, thereby causing the packing to bulge in the inner circumferential direction.

34 is a water inlet provided at the lower end of the drain pipe 33; 35
is a drain port provided at the top end, and any hose may be connected to this drain port.

The connecting screws 20, 24, 27, etc. are constructed using well-known means to maintain the airtight condition inside the main body 17.

Next, the operation of draining the water 38 accumulated on the bottom surface 7b of the bag 7 using the water draining device 16 will be explained.

First, the connecting screw 22 of the connector 19 in the main body 17 is screwed into the female screw 14 of the steam press-in valve 9.

In this case, it is preferable that the drain pipe 33 is pulled up in the direction of the arrow 39 with respect to the main body 17.

Next, the drain pipe 33 is lowered in the direction of the arrow 40, and the water inlet 34 at the lower end thereof is positioned near the bottom surface 7b as shown in the figure.

Separately, the air pressure inlet 25 is connected to an arbitrary pressurized air source, such as an air pump compressor.

When the pressurized air source is activated and pressurized air is blown from the air pressure inlet 25, the air passes through the inside of the base 18 and the through hole 19a of the connector 19, and then through the inside of the steam pressure injection valve 9. and flows into the bag 7.

When the internal space 8 of the bag 7 is pressurized, water 38 enters the drain pipe 33 from the inlet 34 of the drain pipe 33 due to the pressure, passes through the drain pipe 33, and is discharged from the drain port 335.

If this state continues for a while and water no longer comes out from the drain port 35 and the air press-fitted into the bag 7 comes out instead, most of the water in the bag 7 will be drained.

Therefore, it is sufficient to stop the air injection at that point.

Note that the lower end of the drain pipe 33 may have its lower end 36 closed as shown in the partial view of FIG. 3, and an inlet 31 may be formed on the side at a position close to the lower end.

By doing this, the drain pipe 33 is connected to the arrow 40.
Even if the bag 7 is inserted in the wrong direction, the lower end of the drain pipe can be prevented from damaging the bag 7 even if the bag 7 is pushed in too hard.

Furthermore, even if the drain pipe 33 is pushed in so far that the bottom surface 7b of the bag is depressed as shown in the figure, the inlet port 37 will not be blocked, and the water draining operation as described above can be carried out without any problem. Can be done.

As described above, in this invention, the inside of the bag is pressurized by introducing compressed air from the air pressure inlet 25 while the connection port 21 of the water draining device main body 17 is attached to the valve 9 of the bag 7. If the tip (lower end) of the drain pipe 33 is below the water surface as shown in Figure 3, the water inside the bag will be drained outward through the drain pipe due to the pressure inside the bag, making it very easy to drain the water inside the bag. It has an effect that can be removed.

Moreover, in the present invention, since the drain pipe is configured to be able to be inserted into and removed from the main body 17, that is, to be able to move up and down, even if the bag is for a freight vehicle or a passenger car, the diameter of the bag may vary. The tip of the drain pipe can be aligned with the bottom surface of each bag (the position indicated by the reference numeral 7b in FIG. 3), which has the effect of draining most of the water that remains below the bag.

Furthermore, if the bag is made of a material with high elasticity, even if the bag expands and contracts due to the air pressure inside the bag, the drain pipe that is attached to the main body (as opposed to the main body) is removable, This is an innovative effect that can prevent the tip of the drain pipe from accidentally piercing or penetrating the bottom of the bag, causing damage to the bag. be.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a schematic vertical cross-sectional view of a tire retreading device, FIG. 2 is a front view of a bag, and FIG.
The figure is a longitudinal sectional view showing the relationship between the bag and the water draining device. 7... Bag, 9... Valve for steam injection - 16... Water removal device, 17... Body, 21... Connection port, 25...Pneumatic inlet, 33...Drain pipe.

Claims (1)

[Claims] 1 The main body is provided with a connection port that can be attached to a steam pressurization valve in a bag, and is also provided with an air pressure inlet that communicates with the connection port; While it is attached to the steam pressure valve, the tip of the steam can be inserted into the bag through the valve (a strained drain pipe is provided through the bag so that it can be freely inserted and removed, and the drain pipe is The pipe penetrates through the main body, and the drain port at the rear end protrudes from the main body in an open state against the outside air.Furthermore, the drain pipe allows air to be blown into the bag from the air pressure inlet through the connection port. A water draining device for a bag for curing a retread tire, characterized in that the device is airtightly attached to the main body so that compressed air can pass through the interior from the tip of the drain pipe and be discharged from the drain port at the rear end. .