JP4656568B2 - Steel mandrel joint jig and method of manufacturing hose using the same - Google Patents

Description

  The present invention relates to a steel mandrel joint jig and a method of manufacturing a hose using the same (hereinafter, also simply referred to as “joint jig” and “manufacturing method”, respectively). The present invention relates to a steel mandrel joint jig used in manufacturing and a method of manufacturing a hose using the same.

  Conventionally, when manufacturing a hydraulic hose for construction machinery, a hose for cleaning, etc. using a steel mandrel, knitting work has been performed one by one when knitting a wire. In this case, since the wire between the mandrel and the mandrel cannot be a hose, it must be discarded, but since the length between the mandrel and the mandrel is as long as several tens of centimeters, it was a great waste. . In addition, the operation of inserting the mandrel into the knitting machine is very skillful, and the mandrel rotates with the rotation of the knitting machine, which is very dangerous.

On the other hand, since the steel mandrel is in the shape of a pipe, a method has been proposed and used in which a joint rod made of rubber, plastic, or the like is inserted into the end of the mandrel to joint between the mandrel and the mandrel. In addition, as a technique related to a method of manufacturing a molded hose using a mandrel, for example, Patent Document 1 discloses that the end portions of a mandrel body made of metal fittings or the like are attached to both ends of a flexible cylindrical mandrel body. A mandrel is described which is provided with a detachable connecting member for mutual connection.
JP-A-5-301282 (Claims etc.)

  According to the method using the joint rod, it is possible to simplify the insertion of the mandrel into the knitting machine, but on the other hand, since the outer diameter of the mandrel and the outer diameter of the joint rod are close, There was a difficulty that it was difficult to discover the department. In some cases, the joint portion and the hose body are mistaken and the hose body is cut. In addition, it is necessary to cut the joint part after knitting, but the steel mandrel is generally several tens of meters long, but because it is a steel pipe, it cannot be wound and stored. This is because the jointed steel mandrel is twice as long unless it is cut and does not enter the process.

  Furthermore, in the method using the joint rod, the joint rod is thinner than the mandrel, and the mandrel and the joint rod are not in close contact with each other. In some cases, a fatal defect that remains inside the hose was caused. In this case, it is very difficult to find the joint rod remaining inside the hose, and often the hose is shipped with the joint rod remaining, and the fatal claim that the user does not flow the oil inside the hose. The problem of sporadic occurred.

  Accordingly, an object of the present invention is to provide a steel mandrel joint jig that is simple, inexpensive, and has good work efficiency, and eliminates problems at the time of cutting the joint portion, thereby making it more efficient than conventional ones. It is in providing the manufacturing method of a hose.

  In order to solve the above-mentioned problems, the present inventor has intensively studied, and by adopting the following configuration, it is possible to realize a joint method capable of efficient work without causing a problem at the time of cutting the joint part. As a result, the present invention has been completed.

That is, the steel mandrel joint jig of the present invention, the longitudinal ends, with a cylindrical cavity and steel mandrel fitted, characterized Rukoto longitudinal central portion, it is formed smaller in diameter than both end portions It is what.

  In addition, the hose manufacturing method of the present invention is a state in which at least two steel mandrels are connected via the steel mandrel joint jig of the present invention when the hose is manufactured using the steel mandrel. It is characterized by being used.

  According to the present invention, the above-described configuration makes it possible to realize a steel mandrel joint method that is simple, inexpensive, and has good working efficiency, whereby a hose can be manufactured more efficiently. Further, since the joint part of the steel mandrel can be found more easily, the occurrence of an error in the cutting part can be eliminated. Furthermore, it is possible to surely eliminate the fatal defect that the joint rod remains in the hose in the conventional joint method.

Hereinafter, preferred embodiments of the present invention will be described in detail.
In FIG. 1, the schematic perspective view of the joint jig for steel mandrels of this invention is shown. As shown in the figure, the joint jig 1 of the present invention includes cylindrical hollow portions 10 into which steel mandrels are fitted at both ends in the longitudinal direction.

  Cylindrical cavities 10 provided at both ends in the longitudinal direction of the joint jig 1 have an inner diameter slightly larger than the outer diameter of the steel mandrel, and are formed so that the ends of the steel mandrel can be fitted. Accordingly, by fitting and supporting the end portions of the steel mandrels in the cylindrical cavities 10, the joints between the steel mandrels can be performed by a simple and inexpensive method, and the efficiency of manufacturing a hose using the steel mandrels is improved. It can contribute to the conversion. FIG. 2 shows a state in which the end of the mandrel 3 carrying the hose 2 on the outer periphery is fitted in the cylindrical cavity 10 of the joint jig 1.

  The shape of the joint jig 1 is not particularly limited as long as it has no risk of impairing the workability at the time of manufacturing the hose except for having the cylindrical hollow portion 10 as shown in the figure. It is preferable to form the part with a smaller diameter than both ends. This makes it very easy to find the joint part even after the wire is knitted, so there is no possibility of accidentally cutting the hose body part other than the joint part.

  In the present invention, the dimensions of the joint jig 1 are not particularly limited and can be appropriately determined based on the strength required at the time of use. The thickness of the cylindrical cavity 1 is 0.5 mm or more. It is preferable to be 5 mm or less. In the conventional method using the joint rod, there is a possibility that the joint rod remains inside the hose, which may cause a fatal failure. However, in the joint jig 1 of the present invention, the thickness of both ends mated with the mandrel is changed to the mandrel. By forming the outer diameter to be 0.5 mm to 5 mm thicker, there is no possibility that the joint jig will remain inside the hose when the mandrel is extracted in the final process. That is, in this case, the outer diameter of both ends of the joint jig 1 is always 1 mm to 10 mm larger than the inner diameter of the hose, so that the joint jig 1 cannot be pulled into the hose. As a result, it is possible to reliably eliminate the occurrence of a fatal defect that remains in the hose of the joint jig.

  As a material of the joint jig 1, metal or plastic can be used. As the metal, it is possible to preferably use iron, aluminum, copper, and alloys thereof that are inexpensive and have a large elongation. As the plastic, an olefin resin or polyamide resin (nylon) that is inexpensive and easy to mold, an acetal resin excellent in heat resistance (for example, Delrin (registered trademark)), or the like is preferable.

  When the hose is manufactured using the steel mandrel joint jig 1 of the present invention, as shown in FIG. 3, it is used with at least two steel mandrels 2 connected through the joint jig 1. To do. Thereby, the waste of the wire 4 can be reduced as much as possible, and the productivity of the hose can be improved. Further, since the joint jig 1 can be used simply by being fitted to the end of the mandrel 2, it is excellent in workability. The number of connections of the mandrel 2 can be appropriately determined according to the distance between the processes, that is, for example, two when the length of the mandrel 2 is equal to the distance between the processes, three when the length of the interprocess distance is half, In the case of 1/4 of the distance between processes, it is sufficient to connect with 5 wires. In any case, the mandrel 2 itself can be easily handled by cutting the joint jig 1 after knitting. it can.

  In the manufacturing method of this invention, about the point except using it in the state which connected the steel mandrel 2 using the joint jig 1, it can carry out in accordance with a conventional method, and it does not restrict | limit in particular. Also, there is no restriction on the process of using the joint jig 1, and depending on the convenience of handling, not only at the time of wire braiding, but also at each process of extruding, lapping (molding) and vulcanization of the outer jacket rubber. The mandrel 2 can be used in a connected state. Furthermore, there is no restriction | limiting in particular also about the hose which can apply the manufacturing method of this invention, It can apply to any hose manufactured using a steel mandrel.

It is a perspective view of the joint jig for steel mandrels concerning one embodiment of the present invention. It is a fragmentary perspective view which shows the state which made the joint jig shown in FIG. 1 fit with the edge part of the mandrel which carries a hose on the outer periphery. It is a fragmentary perspective view which shows the state which connected the two mandrels through the joint jig shown in FIG.

Explanation of symbols

1 Joint jig for steel mandrel 2 Hose 3 Mandrel 4 Wire 10 Cylindrical cavity

Claims (2)

Longitudinal direction both end portions, provided with a cylindrical cavity and steel mandrel fitted, the center portion in the longitudinal direction, the steel mandrel joint jig characterized that you have been formed smaller in diameter than both end portions. In performing the production of the hose with a steel mandrel, the steel mandrel, via a joint jig for steel mandrel according to claim 1 Symbol placement, the hose, characterized in that it uses a state connected by at least two Production method.

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