JP4565719B2 - Method and apparatus for buffing vulcanized tread member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a buffing method for roughing a base surface of a vulcanized tread member having a tread pattern formed thereon.
[0002]
[Prior art]
To form a retreaded tire, a vulcanized tread member with a pattern formed on the surface by a vulcanization molding machine is wrapped around the base tire, the front and rear ends are joined, and the vulcanized can is vulcanized. In the precure method (cold retreading method) for molding retreaded tires, the vulcanized tread member buffs the base surface, which is the adhesive surface to the base tire, to remove the silicon and solvent on the surface and finish the surface rough Thus, it is possible to improve the adhesiveness when cement is applied and pasted to the base tire.
[0003]
The vulcanized tread member has a flat tread member 01 having a uniformly flat base surface as shown in FIG. 8 and wing portions 02a and 02a on both sides as shown in FIG. There is a tread member 02 with a wing curved inward.
Since the base tire has a toroidal shape, the tread member with wings is more familiar with the base tire than the flat tread member 01, so that the number of tread members with wings has increased in recent years.
[0004]
In general, the buff is carried out by transporting the tread member with the base surface facing up, and applying a rotating brush provided in the middle of the transport. In the case of a conventional flat tread member, the tread member is being transported. Three stages of rough buff, main buff, and finish buff are executed by the sequentially provided brush. In the case of a tread member with wing, four stages of rough buff, main buff, wing buff, and finish buff are provided and executed sequentially. .
[0005]
[Problems to be solved by the invention]
As described above, since there are many buffing stages in the past, the buffing equipment itself is large, equipment cost is high, and the installation space is wide.
[0006]
In addition, even if the tread member is either a flat tread member or a tread member with wings, a slight protrusion is formed on the base surface due to surface tread pattern molding and rubber properties at the time of vulcanization molding, especially in the case of tread members with wings As shown in FIG. 10, the wings 02a and 02a on both sides fall to the outside due to their own weight when transported with the base surface facing upward, and as a result, the protrusions 03 on the base surface are further emphasized, and the convex amount h increases.
[0007]
For example, a tread member with a wing with a normal projection h of 1 mm will increase to about 2.3 mm if the wing part falls outside due to its own weight, and will increase to 1.8 mm or more with a normal projection h of 0.7 mm. .
[0008]
Therefore, it is necessary to first cut the ridge 04 during buffing, so that the buffing efficiency is poor, and even if the base surface is buffed, the vicinity of the ridge 03 becomes a buff remaining 03a as shown in FIG. When the wing portion 02a falls down, the base curved surface is deformed into a concave portion, and the same portion becomes the buff remaining 02b, so that manual buffing is required.
[0009]
In this way, the buffing work is repeated many times in the end, which takes time and effort, and makes automation difficult.
The present invention has been made in view of such a point, and the intended process is a vulcanized product that can perform appropriate rough cutting without leaving a buff with a small number of buffing operations, particularly with respect to a tread member with a wing, and can reduce the size of the apparatus. A tread member buffing method and apparatus are provided.
[0010]
[Means for solving the problems and effects]
In order to achieve the above object, the invention described in claim 1 is a buffing method for roughing a base surface of a belt-shaped vulcanized tread member formed with a tread pattern, wherein the vulcanized tread member Vulcanization in which both sides of the vulcanized tread member are raised at a predetermined position in the middle of conveyance, and a brush rotating across the both sides is pressed against the vulcanized tread member at the same predetermined position from above. A method of buffing the finished tread member was used.
[0011]
Since both sides of the vulcanized tread member transported with the base surface facing up are raised at predetermined positions, the wing of the tread member with wing can be supported and maintained by preventing the wing from falling outward. The protrusion does not increase, and the base curved surface does not deform into a recess.
Therefore, there is no need to cut the ridge during buffing, and no buff remains in the vicinity of the ridge and the curved base surface. This facilitates automation, enables appropriate rough cutting with a small number of buffing operations, and makes the device compact. .
[0012]
The invention according to claim 2 is the buffing method of the vulcanized tread member according to claim 1, wherein the bulging of both side portions of the vulcanized tread member is on both outer sides below both side portions of the vulcanized tread member. It is performed by inserting a wedge-shaped inserter from one side.
[0013]
Both sides are raised by inserting wedge-shaped inserters from the outside on both sides of the vulcanized tread member, so both sides can be raised easily if necessary, with wings The tread member can be used properly so that it is raised and the flat tread member is not raised.
[0014]
According to a third aspect of the present invention, in the buffing method for a vulcanized tread member according to the first or second aspect, the vulcanized tread member is reciprocated by reversing the conveying direction and repeatedly buffed with the same brush. It is characterized by that.
[0015]
Unlike multiple stages that are provided in the middle of conveying the vulcanized tread member and buffing is executed sequentially at each stage, the vulcanized tread member is reciprocated and repeatedly buffed with the same brush, so the buffing equipment itself It can be made small and compact, and the installation cost can be reduced while keeping the equipment cost low.
[0016]
According to a fourth aspect of the present invention, there is provided a buffing device for rough cutting a base surface of a belt-like vulcanized tread member having a tread pattern formed thereon, a conveying means for conveying the vulcanized tread member with the base surface facing upward, A vulcanized unit comprising a swelling means for raising both sides of the vulcanized tread member at a predetermined position in the middle, and a scraping means for roughing the vulcanized tread member by pressing a rotating brush across the both sides at the predetermined position. It is a tread member buffing device.
[0017]
While the vulcanized tread member is being conveyed by the conveying means, both sides of the vulcanized tread member are raised by the raising means, and the wing of the tread member with wings can be supported and maintained by falling outside. The base surface is roughened while the surface of the base surface is not raised and the base curved surface is not deformed into a recess, and the brush of the scraping means rotates. A buffing operation is performed, and the device itself can be made compact.
[0018]
According to a fifth aspect of the present invention, in the buffing device for a vulcanized tread member according to the fourth aspect, the swelling means inserts wedge-shaped inserters from both outer sides below both sides of the vulcanized tread member. It is a thing to do.
[0019]
Inserted wedge-shaped inserters from the outside on both sides of the vulcanized tread member, and swells both sides so that both sides can be easily swelled as required. In the case of a raised or flat tread member, it can be used properly so as not to be raised.
[0020]
The invention according to claim 6 is the buffing device for the vulcanized tread member according to claim 5, wherein the inserter is prepared in various wedge shapes and is suitable for the shape of the side portion of the vulcanized tread member. The inserter is selected and used, or by changing the position of the inserter, the way of raising the both ends of the vulcanized tread member is changed.
[0021]
Different inserts with different wedge shapes can be selected and used for various shapes of vulcanized tread members, or both ends of vulcanized tread members can be raised by changing the position of the inserter The proper buffing work can always be performed efficiently.
[0022]
According to a seventh aspect of the present invention, in the buffing device for a vulcanized tread member according to any one of the fourth to sixth aspects, the rotating brush has a substantially cylindrical shape, and both side portions are at the tip. It is characterized by gradually decreasing the diameter.
[0023]
In particular, the base curved surfaces on both sides of the winged tread member can be appropriately and efficiently buffed by the shape in which the diameters of both sides of the rotating brush are gradually reduced.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
An overall external view of the buffing device 1 of the present embodiment is shown in FIG.
[0025]
A buff line is configured by the roller conveyor 2, and the buff device 1 is disposed in the middle of the buff line, and the vulcanized tread member 3 with wing is conveyed by the roller conveyor 2 and passes through the buff device 1. Is executed.
[0026]
The buffing device 1 is covered with a cover 4 so that shavings generated by the buffing work are not scattered around, and includes a dust suction device to suck the shavings.
[0027]
The structure of the buffing device 1 inside the cover 4 is shown in FIG.
A belt conveyor 11 is interposed between the front and rear roller conveyors 2 and 2.
In the belt conveyor 11, an endless belt 12 is bridged between the front and rear rollers 13 and 14, and a portion rotating on the upper side of the belt 12 is curved so as to be slightly swollen upward by a plurality of guide rollers 15, A portion that rotates on the lower side of the belt 12 is curved so as to bulge downward by a plurality of guide rollers 16.
[0028]
A brush 20 is provided above and below the central portion at the highest position of the curved portion that rotates on the upper side of the belt 12 so that the brush 20 can be moved up and down. It has a cylindrical shape and both sides have a tapered shape with a gradually decreasing diameter toward the tip.
[0029]
The brush 20 is oriented horizontally in the width direction of the belt 12 and rotates around the axis, and the width of the brush 20 is larger than the width of the tread member 3 with wings.
The brush 20 is driven forward and backward by a motor (not shown).
[0030]
Wedge-shaped inserters 31 and 32 are slidably provided in the horizontal direction so as to approach and separate from each other at the center of the curved portion rotating above the belt 12 below the brush 20. .
The inserters 31 and 32 have the same wedge shape that forms a right triangle when viewed from the side, and are disposed in a symmetrical manner with the wedge-shaped tips facing each other.
[0031]
In FIG. 2, the inserters 31 and 32 are positioned on the left and right with the belt 12 in between. When the inserters 31 and 32 are slid in the direction approaching each other from the same position, the tapered tips of the inserters 31 and 32 are shown in FIG. It is inserted to bite into the underside.
By inserting the left and right inserters 31 and 32, the left and right sides of the belt 12 are raised at the same position.
[0032]
Therefore, the rotating belt 12 of the belt conveyor 11 is formed with swelled portions 12a and 12a on the left and right sides thereof, and gets over the left and right inserters 31 and 32.
The inserters 31 and 32 have their upper surfaces slightly curved upward so that the belt 12 can smoothly get over.
[0033]
When the tread member 3 with wings is conveyed by the roller conveyor 2 with the base surface facing up and transferred to the belt conveyor 11, the tread member with wings is formed by the left and right raised portions 12a and 12a of the belt 12 at the center position. 3 can prevent and support the wings 3a, 3a on the left and right side portions from falling outside.
[0034]
The brush 20 descends while rotating on the vulcanized tread member 3 and can contact the base surface and buff the base surface as shown in FIG.
FIG. 5 shows a cross-sectional view of the main part in the state shown in FIG.
[0035]
As shown in FIG. 5, the left and right raised portions 12a and 12a of the belt 12 formed by inserting the left and right inserters 31 and 32 prevent the left and right wing portions 3a and 3a of the tread member 3 with wings from falling down.
A brush 20 whose left and right sides are tapered is pressed against the upper base surface of the tread member 3 with wings maintained in this shape with an appropriate pressing force while rotating.
[0036]
Since the left and right wing portions 3a and 3a of the tread member 3 with wing are supported, the protrusions formed on the base surface as described above are not emphasized, and the convex amount h does not increase.
Further, the base curved surface is not deformed into the concave portion.
[0037]
If the shape of the brush 20 is appropriate for the winged tread member 3 maintained in such a shape, buffing is effectively performed.
The tread member 3 with wing is identified by the width W and the height H shown in FIG. 6, and the width W and height H of the 9-inch and 10-inch tread members are shown in the table of FIG. Street.
[0038]
On the other hand, the buffing efficiency of the brush depends on the width W ′ of the brush shown in FIG.
Here, the per-brush amount α refers to the wing portion of the tread member 3 with the wing when the brush 20 approaches the tread member 3 with the wing from above the base surface ((1) in FIG. 7). This is the amount of compression of the brush portion compressed by the wing portion 3a as shown in FIG. 7 (2) when in contact with the central base surface other than 3a.
[0039]
It is desirable that the amount per brush α increases toward the tip of the wing portion, and the table in FIG. 6 shows the amount per brush α at the rising portion of the wing portion.
[0040]
As shown in the table of FIG. 6, for a 9-inch winged tread with a width W of 230 mm and a height H of 44 mm, a brush with a width W ′ of 245 mm and a brush contact amount α of 6.5 mm is 15 mm. A wedge-shaped inserter having a wedge tip angle θ (see inserters 31 and 32 in FIG. 6) of 30 degrees is used.
[0041]
For a 10-inch winged tread member with a width W of 255 mm and a height H of 43 mm, an inserter with a width W ′ of 20 mm, a 275 mm brush with a brush contact amount α of 5 mm, and a wedge tip angle θ of 20 degrees. It is appropriate to use
[0042]
The width W ′ of the brush is preferably larger than the width W of the tread member with wings. However, since it is meaningless if it is too large, the difference between them is set to 100 mm or less, preferably 25 mm or less.
[0043]
As for the amount α per brush, the range of 2 to 10 mm is appropriate, and preferably 5 to 8 mm, the buffing efficiency can be improved and the brush life can be extended.
[0044]
As described above, by using the appropriate inserters 31 and 32 for the tread member 3 with wings, the tread member 3 with wings does not increase the protruding amount h of the protrusion on the base surface at a predetermined position of the belt conveyor 11. The left and right wings 3a and 3a are supported in a state where the base curved surface is not deformed into a concave portion, and are pressed against the base surface with an appropriate pressing force while rotating the brush 20 having an appropriate width W ′ and a brush contact amount α. By doing so, it is possible to perform appropriate rough cutting without generating a buff residue.
[0045]
Since there is no increase in the convex amount h of the ridge on the base surface, there is no need to cut the ridge and no buff remains, so there is no need to partially buff manually and buffing efficiency is extremely good .
[0046]
The roller conveyor 2 and the belt conveyor 11 that convey the tread member 3 with wing can be reversed, the tread member 3 with wing can be reciprocated, and the brush 20 can also be reversed.
Therefore, one brush 20 of one buffing device 1 can repeatedly buff the tread member 3 with wings that are reciprocally conveyed by sequentially reversing the rotation direction and appropriately changing the pressing force.
[0047]
Normally, the tread member 3 with wing is moved back and forth half a half, that is, forward / backward / forward, and the buffing process is completed by three times of buffing work, and further, the buffing work to scrape the buffing residue manually is unnecessary. Buffing efficiency is good.
[0048]
Unlike the conventional method in which a plurality of stages are provided in the middle of transporting the tread member and buffing is sequentially executed at each stage, the tread member 3 with wings is transported back and forth and repeatedly buffed with the same brush 20. It is small and can be made compact, and the installation cost can be reduced by keeping the equipment cost low.
[0049]
Appropriate brushes and inserters are prepared for each tread member with wings, and can be selected according to the tread member with wings for easy replacement or used by changing the position of the inserter. By changing the way of raising both ends of the vulcanized tread member, it is possible to always perform an appropriate buffing operation efficiently.
[0050]
In the case of a flat tread, either use a cylindrical brush that is not tapered at both ends, or use it so that only the cylindrical part is buffed even if both ends are tapered. What is necessary is just to use a flat tread member and a winged tread member easily.
[Brief description of the drawings]
FIG. 1 is an overall external view of a buffing apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a structure of a buffing device inside a cover.
FIG. 3 is a perspective view showing the structure of the buffing device in another state.
FIG. 4 is a perspective view showing a structure of a tread member with a wing and a buffing device at the time of buffing.
FIG. 5 is a cross-sectional view of a main part during buffing.
FIG. 6 is a table showing corresponding dimensions of a tread member with wing, a brush, and an inserter, and dimensions of each member.
FIG. 7 is an explanatory view of a tread member with a wing and a brush for explaining a brush contact amount α.
FIG. 8 is a cross-sectional view of a flat tread member.
FIG. 9 is a cross-sectional view of a tread member with a wing.
FIG. 10 is a cross-sectional view when the tread member with wings is placed on a plane with the base surface facing up.
FIG. 11 is a perspective view of a conventional buffed tread member with wings.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Buffing device, 2 ... Roller conveyor, 3 ... Tread member with wing, 4 ... Cover,
11 ... belt conveyor, 12 ... belt, 13, 14 ... roller, 15, 16 ... guide roller,
20 ... Brush, 21 ... Rotating shaft, 22 ... Wire,
31, 32 ... Inserters.

Claims (7)

In the buffing method for roughing the base surface of the belt-shaped vulcanized tread member in which the tread pattern is formed,
Transport the vulcanized tread member with the base surface up,
Raise both sides of the vulcanized tread member at a predetermined position during transportation,
A buffing method for a vulcanized tread member, characterized in that a brush rotating over both sides is pressed against the vulcanized tread member from above at the predetermined position and buffed. The bulging of both side portions of the vulcanized tread member is performed by inserting wedge-shaped inserters from both outer sides below the both side portions of the vulcanized tread member. Buffing method for vulcanized tread members. The buffing method for a vulcanized tread member according to claim 1 or 2, wherein the vulcanized tread member is reciprocally conveyed by reversing the conveying direction and repeatedly buffed with the same brush. In the buffing device for roughing the base surface of the belt-shaped vulcanized tread member in which the tread pattern is formed,
Transport means for transporting the vulcanized tread member with the base surface facing up;
Swelling means for raising both sides of the vulcanized tread member at a predetermined position in the middle of conveyance;
A buffing device for a vulcanized tread member, characterized by comprising a cutting means for pressing and roughing a brush rotating on both sides of the vulcanized tread member at the predetermined position. 5. The buffing device for a vulcanized tread member according to claim 4, wherein the swelling means inserts a wedge-shaped inserter from both outer sides below both sides of the vulcanized tread member. The inserter is prepared in various wedge shapes, and an inserter suitable for the shape of the side of the vulcanized tread member is selected and used, or a vulcanized tread member is changed by changing the position of the inserter. The buffing device for a vulcanized tread member according to claim 5, wherein a method of raising both ends of the vulcanized tread member is changed. The vulcanized product according to any one of claims 4 to 6, wherein the rotating brush has a substantially cylindrical shape, and both side portions are gradually reduced in diameter toward the tip. Tread member buffing device.

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