JP2016210133A - Spew trimming equipment and spew trimming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spew trimming technique by which after a spew is trimmed, a load due to a removal work in an inspection process can be reduced without generation of stain by a lubrication on a surface of a tire.SOLUTION: Spew trimming equipment for ablation of spew formed on a surface of a tire after vulcanization by a cutter blade comprises: rotating means which rotates the tire after vulcanization; spraying and coating means which sprays and coats a lubricant onto a surface of the rotating tire after vulcanization; a cutter blade for ablation of spew; and contacting means which brings the cutter blade into contact with the surface of the tire after vulcanization. The spraying and coating means performs spraying and coating of the lubricant by use of an internal mixing type mist nozzle which previously mixes the lubricant and air in the interior thereof and sprays them as mists, and discharge port of the mist nozzle is positioned above the tire after vulcanization.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tire spew trimming apparatus and a spew trimming method for trimming spews formed on the surface of a vulcanized tire.

  On the surface of the tire after vulcanization, thin protrusions, that is, spews are formed by vent holes or the like provided in the vulcanization mold in order to release air during vulcanization. Such spew is trimmed using a cutter blade such as a clipper blade in order to impair the appearance of the pneumatic tire.

  Prior to this trimming, a lubricant such as silicon may be sprayed and applied to the tire surface using a spray gun to reduce friction between the tire and the cutter blade, prevent damage to the tire, and cool the cutter blade. Conventionally, it is performed (for example, patent document 1).

JP, 2015-30223, A

  However, in the case of the conventional spew trimming method described above, after the spew is trimmed, the lubricating liquid applied to the tire surface is dried to cause a stain, which may cause a decrease in the appearance of the tire. When such a stain occurs, it is necessary for the operator to remove it as dirt, but this removal operation is a heavy load on the operator.

  Therefore, an object of the present invention is to provide a spew trimming technique capable of reducing a load of a work for removing a stain without causing a stain due to a lubricating liquid on the tire surface after trimming the spew.

  The inventor has intensively studied and found that the above-described problems can be solved by the invention described below, and has completed the present invention.

The invention of claim 1
A spew trimming device for cutting a spew formed on the surface of a tire after vulcanization with a cutter blade,
Rotating means for rotating the vulcanized tire;
Spray application means for spraying and applying a lubricant to the surface of the rotating vulcanized tire;
A cutter blade for excising the spew;
Contact means for bringing the cutter blade into contact with the surface of the tire after vulcanization,
The spray application means is a spray application means for spraying and applying the lubricating liquid using an internal mixing type mist nozzle that mixes the lubricating liquid and air in advance and sprays it as mist.
The spew trimming device, wherein a discharge port of the mist nozzle is positioned above the vulcanized tire.

The invention described in claim 2
2. The spew trimming apparatus according to claim 1, wherein a distance between a discharge port of the mist nozzle and a surface of the vulcanized tire is 300 to 500 mm.

The invention according to claim 3
The spew trimming apparatus according to claim 1 or 2, wherein the spray application unit is configured to spray the lubricating liquid at a pressure of 0.1 to 0.9 MPa.

The invention according to claim 4
A spew trimming method in which a lubricant is sprayed and applied to the surface of a rotating vulcanized tire, and then a spew formed on the surface of the vulcanized tire is cut using a cutter blade,
An internal mixing type mist nozzle that mixes the lubricating liquid and air in advance and sprays the mist as a mist is disposed so that a nozzle discharge port is located above the vulcanized tire, and the lubrication is performed from the mist nozzle. A spew trimming method characterized by spraying and applying a liquid.

The invention described in claim 5
5. The spew trimming method according to claim 4, wherein water is used as the lubricating liquid.

  According to the present invention, it is possible to provide a spew trimming technique capable of reducing a load of a work for removing a stain without causing a stain due to a lubricating liquid on the tire surface after trimming the spew.

It is typical sectional drawing of the external mixing type nozzle in the conventional spew trimming apparatus. It is typical sectional drawing of the internal mixing type mist nozzle in the spew trimming apparatus which concerns on one embodiment of this invention. 1 is a front view schematically showing a spew trimming apparatus according to an embodiment of the present invention. It is a figure which shows typically the supply line which supplies air and lubricating liquid to a spray gun in one embodiment of this invention.

1. Background to the Invention Prior to the description of the embodiment of the present invention, the background to the present invention will be described.

  The present inventor has examined why a stain of the lubricating liquid is generated on the surface of the tire when a conventional spew trimming apparatus is used. As a result of repeated experiments to confirm the relationship between various spray conditions and the occurrence of spots, the occurrence of spots is related to the particle size of the lubricating liquid, and the nozzle attached to the tip of the spray gun It was found that when the lubricating liquid having a large particle size adheres to the tire surface among the particulate lubricating liquid sprayed from No. 1, spots are generated.

  As a result of further investigation on the cause of the spraying of such a large particle size lubricating liquid from the nozzle, it was found that there was a cause in using an external mixing nozzle as the nozzle.

  FIG. 1 is a schematic cross-sectional view of an external mixing nozzle in a conventional spew trimming apparatus. As shown in FIG. 1, the external mixing type nozzle discharges the lubricating liquid M pumped from a tank (not shown) from the discharge port 5 while discharging air A from the air discharge port outside the nozzle. By colliding with the lubricating liquid M, the lubricating liquid M and the air A are mixed outside the nozzle to form particles of the lubricating liquid M and spray the tire surface.

  This external mixing type nozzle has a feature that a very large amount of spraying can be ensured, while the particle diameter of the lubricating liquid M is adjusted by the pressure of the air A colliding with the lubricating liquid M, There is a characteristic that the particle diameter varies, and it is difficult to control only the small particle diameter.

  For this reason, in a conventional spew trimming apparatus using an external mixing type nozzle, it was found that application of a lubricating liquid having a large particle size is unavoidable, and as a result, spots are likely to occur on the tire surface.

  Based on the above findings, the present inventor has studied a nozzle capable of generating a lubricant having a small particle size without variation, and has come up with an internal mixing type mist nozzle capable of generating mist.

  FIG. 2 is a schematic cross-sectional view of an internally mixed mist nozzle in the spew trimming apparatus according to the present embodiment. As shown in FIG. 2, the mist nozzle of the present embodiment is different from the above-described external mixing type nozzle in that air is supplied into the nozzle and the lubricating liquid M and air A are mixed in the mixing chamber 4 inside the nozzle. It is configured to be mixed.

  In this way, by mixing the lubricating liquid M and the air A before the lubricating liquid M is discharged from the discharge port 5, the lubricating liquid can be made to have a small particle diameter without variation, and mist can be generated. It is possible to prevent the generation of a stain due to the application of a lubricating liquid having a large particle size, and it is possible to reduce the load of the stain removal operation.

  However, the internal mixing type mist nozzle is more precise than the conventional external mixing type nozzle, so if it is placed around a spew trimming device where rubber scraps or spews that are generated when the spew is cut off are easily scattered, It has been found that there is a big problem that the outlet is easily clogged and cannot be used properly.

  Therefore, the present inventor conducted further investigation and positioned the discharge port of the mist nozzle above the vulcanized tire to prevent the discharge port from being clogged with scattered rubber residue or spew, thereby allowing internal mixing. The present invention has been completed by allowing the mold mist nozzle to be appropriately used in a spew trimming apparatus.

  Such an internal mixing type mist nozzle can be applied sufficiently even if the flow rate is very small when spraying and applying to the tire surface as compared with the external mixing type nozzle. Can be greatly reduced, and the preparation work of the lubricating liquid M by the operator can also be reduced.

  In addition, by using an internal mixing type mist nozzle as in this embodiment, the mist can be generated with a small particle diameter of the lubricating liquid without variation, and sprayed and applied quantitatively and uniformly on the tire surface. Therefore, water can be used as the lubricating liquid instead of the conventionally used silicon, and the occurrence of spots can be prevented more reliably.

2. Next, a spew trimming apparatus for spraying and applying a lubricating liquid to the tire surface using the above-described internal mixing type mist nozzle will be described.

  FIG. 3 is a front view schematically showing the spew trimming apparatus according to the present embodiment. As shown in FIG. 3, the spew trimming device includes a tire rotating means (not shown) that rotates the vulcanized tire T in the direction of the white arrow, and a lubricating liquid M on the surface Ta of the rotating tire T. A spray gun 3 serving as a spray application means for spraying and applying from the nozzle at the tip, and a cutter blade 2 attached to the holder 1 for cutting off the spew S are provided. Then, the spew S is cut by bringing the cutter blade 2 into contact with the surface Ta of the tire T on which the lubricating liquid M has been spray-coated.

  In the spew trimming apparatus according to the present embodiment, as the nozzle attached to the tip of the spray gun 3 for spraying the lubricating liquid M, an internal mixing type mist nozzle as shown in FIG. 2 is used. The spray gun 3 is arranged so that the discharge port of the mist nozzle is located above the tire T.

  Next, a supply line for supplying air and lubricating liquid to the above-described spray gun will be described. FIG. 4 is a diagram schematically showing a supply line for supplying air and lubricating liquid to the spray gun of the present embodiment. In FIG. 4, the shape of the nozzle of the spray gun 3 is schematically shown in order to clarify the configuration of the supply line.

  As shown in FIG. 4, in the present embodiment, the spray gun 3 is connected to a lubricating liquid supply line that supplies the lubricating liquid M and an air supply line that supplies air A.

  The lubricating liquid supply line is formed between the main tank 6 in which the lubricating liquid M is stored and the spray gun 3, and the lubricating liquid M sent out from the main tank 6 with the hydraulic pressure adjusted by the pressurizing pump 9. Is supplied to the spray gun 3 via a strainer 7 for filtering impurities.

  The air supply line is configured such that the air supplied from the air supply mechanism (not shown) with the air pressure adjusted by the air regulator 8 is supplied to the spray gun 3.

  In this way, the pressure of the lubricating liquid M is adjusted by the pressurizing pump 9 and the air pressure is adjusted by the air regulator 8 and mixed in the nozzle, whereby the nozzle of the spray gun 3 disposed above the tire T is adjusted. It is possible to control the spray amount, particle diameter, and spray width of the mist sprayed from the discharge port, and thus the mist of the lubricating liquid M can be sprayed appropriately.

  The distance between the discharge port 5 of the mist nozzle and the surface of the tire T after vulcanization is preferably set to 300 to 500 mm, and the pressure for spraying the lubricating liquid is set to 0.1 to 0.9 MPa. preferable. Thus, the usage-amount of lubricating fluid can be reduced by adjusting appropriately the distance of the discharge port 5 of a mist nozzle, and the tire T, and the pressure which sprays lubricating fluid.

  As a specific example, the present inventor adjusts the hydraulic pressure of the lubricating liquid M to 100 kpa by the pressurizing pump 9 and the air pressure to 100 kpa by the air regulator 8 in the spew trimming apparatus in the present embodiment. After the misting lubricant M was sprayed and applied from the discharge port of the tip nozzle 3, the trimming process was performed. As a result, it was confirmed that the generation of a stain after the trimming process can be sufficiently prevented.

  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 Holder 2 Cutter blade 3 Spray gun 4 Mixing chamber 5 Discharge port 6 Main tank 7 Strainer 8 Air regulator 9 Pressurizing pump A Air M Lubricating fluid S Sup T Tire Ta Tire surface

Claims (5)

A spew trimming device for cutting a spew formed on the surface of a tire after vulcanization with a cutter blade,
Rotating means for rotating the vulcanized tire;
Spray application means for spraying and applying a lubricant to the surface of the rotating vulcanized tire;
A cutter blade for excising the spew;
Contact means for bringing the cutter blade into contact with the surface of the tire after vulcanization,
The spray application means is a spray application means for spraying and applying the lubricating liquid using an internal mixing type mist nozzle that mixes the lubricating liquid and air in advance and sprays it as mist.
The spew trimming device, wherein a discharge port of the mist nozzle is located above the vulcanized tire.   The spew trimming apparatus according to claim 1, wherein a distance between a discharge port of the mist nozzle and a surface of the vulcanized tire is 300 to 500 mm.   The spew trimming apparatus according to claim 1 or 2, wherein the spray application unit is configured to spray the lubricating liquid at a pressure of 0.1 to 0.9 MPa. A spew trimming method in which a lubricant is sprayed and applied to the surface of a rotating vulcanized tire, and then a spew formed on the surface of the vulcanized tire is cut using a cutter blade,
An internal mixing type mist nozzle that mixes the lubricating liquid and air in advance and sprays the mist as a mist is disposed so that a nozzle discharge port is located above the vulcanized tire, and the lubrication is performed from the mist nozzle. A spew trimming method comprising spraying and applying a liquid.   The spew trimming method according to claim 4, wherein water is used as the lubricating liquid.

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