JP2011025290A - Welding equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide welding equipment that facilitates welding of the end faces of two metallic wires to each other safely and in a short time. <P>SOLUTION: The welding equipment for welding the end faces of two metallic wires 21, 22 to each other is configured: to have a lower die 1 in which a cross sectionally half-circular groove 16 for the metallic wires 21, 22 to be placed on is penetrated from one end to the other end; to have an upper die 2 in which a groove 17 of the same shape is formed in a position opposing the groove 16; and to supply a welding wire 9 and an inert gas to the inner face of the groove 17 of the upper die 2, with a prescribed voltage applied between the welding wire 9 and the inner face of the groove 16 of the lower die 1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a welding apparatus, and more particularly to a welding apparatus that can safely and easily weld end faces of two metal filaments in a short time.

  In the manufacturing process of a conveyor belt having a steel cord as a core (reinforcing layer), the steel cord is unwound from the drum and used. When unwinding from one drum is completed, the unrolled steel cord The rear end is joined to the front end of a steel cord that is unwound from the next drum, and is continuously supplied to the production process of the conveyor belt.

  This joining operation is usually performed by manual welding, but there is a problem that the welding operation is potentially dangerous for the operator and the production line must be stopped until the welding operation is completed. In particular, if the number of steel cords becomes very large, the production line must be stopped for a long time, so the time that the conveyor belt stays in the vulcanization press is extended, and the vulcanization time of the cover rubber is exceeded, It will cause quality degradation.

  In order to solve such a problem, it is conceivable to use a welding apparatus as proposed in Patent Document 1 to achieve semi-automated welding work.

  However, the welding apparatus disclosed in Patent Document 1 has a problem that it is difficult to perform a welding operation because the structure and operation are complicated.

JP 11-28572 A

  The objective of this invention is providing the welding apparatus which can weld the end surfaces of two metal filaments safely and easily in a short time.

  The welding device of the present invention that achieves the above object is a welding device for welding the end faces of two metal filaments, and a semicircular groove having a semicircular cross section on which the metal filament can be placed is one end. A lower die penetrating from the other end to the other end, and an upper die formed with a groove having the same shape as the groove at a position facing the groove, and supplying a welding wire and an inert gas to the inner surface of the groove of the upper die In addition, a predetermined voltage is applied between the welding wire and the inner surface of the lower mold groove.

  The inner surfaces of the upper and lower mold grooves are preferably covered with copper. Further, at least in the lower mold groove, it is preferable to install a holder that presses the metal filament in the radial direction with an elastic force.

  The welding apparatus of the present invention is suitably used for welding the end surfaces of steel cords constituting the core of the conveyor belt.

  According to the welding apparatus of the present invention, a groove having a semicircular cross section on which a metal filament can be placed penetrates from one end to the other end, and a groove having the same shape is formed at a position facing the groove. An upper die, supplying a welding wire and an inert gas to the inner surface of the upper die groove, and applying a predetermined voltage between the welding wire and the inner surface of the lower die groove, Since arc welding is performed inside the upper mold, welding work can be performed safely and in a short time. In addition, since the worker only needs to supply the inert gas, the welding wire, and the electric power after placing the two metal filaments on the lower mold and then covering the upper mold, the welding work is easily performed. be able to.

It is a block diagram of the welding apparatus which consists of embodiment of this invention. It is a perspective view which shows the structure of the upper mold | type and lower mold | type of the welding apparatus of FIG. It is sectional drawing in the AA arrow shown in FIG. It is a perspective view explaining the procedure of welding operation, (a) shows a preparation operation, (b) shows a welding operation, respectively. It is a partial cross section figure of the lower mold | type which shows the structure of a holder.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a configuration of a welding apparatus according to an embodiment of the present invention.

  This welding apparatus includes a lower mold 1 on which a metal wire is placed, and an upper mold 2 that is disposed so as to face the lower mold 1 and can be moved up and down. The upper die 2 is provided with a supply pipe 5 leading from the upper surface 3 to the lower surface 4. The supply pipe 5 has a gas pipe 7 connected to an inert gas cylinder 6, a welding wire 9 fed from a feeding device 8, and electric power. The conducting wire 11 connected to the plus terminal of the supply apparatus 10 is accommodated. Further, the lower mold 1 is formed with a through hole 14 penetrating from the lower surface 12 to the upper surface 13, and houses a conductive wire 15 connected to the negative terminal of the power supply device 10. In addition, it is preferable that the welding wire 9 has as a main component the same material as a metal filament, and argon gas and helium gas are illustrated as an inert gas.

  On the upper surface 13 of the lower mold 1 and the lower surface 4 of the upper mold 2, as shown in FIG. 2, grooves 16 and 17 that are semicircular in cross section and on which a metal wire can be placed and penetrate in the longitudinal direction, A plurality are formed at positions facing each other. The through hole 14 of the lower mold 1 and the supply pipe 5 of the upper mold 2 are provided for each of the grooves 16 and 17, respectively, and open to the inner surfaces of the grooves 16 and 17 at positions overlapping vertically as shown in FIG. .

  The welding wire 9 is slidably accommodated in a nozzle tube 20 in which an insulating material 18 is sealed, and is in contact with the conductor 11 through a contact tip 19 in the vicinity of the opening. Further, the direction of the outlet of the distal end of the gas pipe 7 is adjusted so that an inert gas can be blown to the vicinity of the distal end portion of the welding wire 9.

  The welding operation of two metal filaments by such a welding apparatus will be described below with reference to FIG.

  First, as shown in FIG. 4A, two metal filaments 21 and 22 are placed in series in the groove 16 of the lower mold 1, and the end surfaces 23 and 24 of each other protrude directly above the through hole 14. To fit. Next, as shown in FIG. 4 (b), after the upper die 2 is put on the lower die 1 and the metal filaments 21 and 22, power is supplied to the conducting wires 11 and 15 and the gas pipe 7 is inactive. The welding wire 9 is sent out while jetting gas. As a result, an arc shielded by an inert gas is generated at the tip of the welding wire 9, and the end surfaces 23 and 24 of the metal filaments 21 and 22 and the welding wire 9 are melted by the heat of the arc. Then, the end surfaces 23 and 24 of the metal filaments 21 and 22 can be melt-bonded by stopping the supply of the inert gas and power and cooling for a certain period of time.

  Thus, since arc welding is performed inside the lower mold 1 and the upper mold 2, the welding operation can be performed safely and in a short time. In addition, since the worker only places the two metal filaments 21 and 22 on the lower mold 1 and then covers the upper mold 2 and then supplies the inert gas, the welding wire 9 and electric power, the welding operation is performed. Can be easily performed.

  In the above welding apparatus, it is desirable to cover the inner surfaces of the grooves 16 and 17 of the lower mold 1 and the upper mold 2 with copper. By doing so, it is possible to prevent the metal filaments 21 and 22 from being fixed to the inner surfaces of the grooves 16 and 17 after welding, and to shorten the cooling time.

  Moreover, it is desirable to provide the holder 25 which elastically presses the metal filaments 21 and 22 in the radial direction on the inner surface of the groove 16 of the lower mold 1. Examples of the holder 25 include those in which a spherical body 28 is fixed to one end of a spring 27 housed in a recess 26 formed in the bottom surface of the groove 16 as shown in FIG. By providing such a holding tool 25, the metal filaments 21 and 22 wound around the drum and having the curl are securely held between the upper die 2 and the lower die 1, so that welding is stable. Can be done. A plurality of the holders 25 may be arranged in the circumferential direction of the groove 16 or provided in the groove 17 of the upper mold 2.

  Although the welding apparatus of the present invention is not particularly limited in use, in order to continuously supply the steel cord, the metal cords 21 and 22 are steel cords that are the cores of the conveyor belt. It is suitably used for welding work for joining the tip of the other steel cord to the rear end of one steel cord.

DESCRIPTION OF SYMBOLS 1 Lower mold 2 Upper mold 3 (Upper mold) Upper surface 4 (Upper mold) Lower surface 5 Supply pipe 6 Cylinder 7 Gas pipe 8 Feeding device 9 Welding wire 10 Electric power supply device 11 (To upper mold) Conductor 12 (Lower Lower surface 13 (lower die) upper surface 14 Through hole 15 (to lower die) Conductor 16 (lower die) groove 17 (upper die) groove 18 Insulating material 19 Contact chip 20 Nozzle tube 21, 22 Metal wire Articles 23 and 24 End face 25 Holder 26 Recess 27 Spring 28 Spherical body

Claims (4)

A welding device for welding the end faces of two metal filaments,
A lower mold in which a semicircular groove having a cross-sectional shape on which the metal wire can be placed penetrates from one end to the other end;
An upper mold in which a groove having the same shape as the groove is formed at a position facing the groove;
A welding apparatus that supplies a welding wire and an inert gas to the inner surface of the upper mold groove and applies a predetermined voltage between the welding wire and the inner surface of the lower mold groove.   The welding apparatus according to claim 1, wherein inner surfaces of the grooves of the upper mold and the lower mold are coated with copper.   The welding apparatus according to claim 1 or 2, wherein a holder for pressing the metal wire rod with an elastic force in a radial direction is installed in at least the groove of the lower mold.   The welding apparatus according to any one of claims 1 to 3, wherein the metal wire is a steel cord constituting a core of a conveyor belt.

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