JPH0665685U - Arc resistant hose - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an arc resistant hose that will not be damaged even when used under severe conditions. [Structure] A flame resistant fiber layer 2 is provided on the outer layer of a fluororesin tube 1, and a flame retardant varnish 3 is applied to the surface of the flame resistant fiber layer 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an arc resistant hose, and more particularly to an arc resistant hose suitable for use as a piping hose for air and liquid in an arc welding robot.

[0002]

[Prior art]

 Conventionally, as an arc resistant hose, a tube made of polyurethane, polyvinyl chloride, silicone rubber or the like having an outer layer coated with flame resistant fibers has been used.

[0003]

[Problems to be solved by the device]

 However, in such a conventional arc-resistant hose, when the welding arc is used under severe conditions where it hits a large amount for a long time, the heat from the arc is transmitted to the inner tube and the tube is punctured. The problem arises that

An object of the present invention is to solve the above conventional problems and provide an arc resistant hose that is not damaged even when used under severe conditions.

[0005]

[Means for Solving the Problems]

 As a result of various studies to achieve the above object, the present invention has found that a fluorine resin tube may be used as a tube, and has completed the present invention.

That is, the present invention is an arc resistant hose characterized in that a flame resistant fiber layer is provided on the outer layer of a fluororesin tube.

[0007]

[Action]

 In the present invention, since the fluororesin tube having excellent heat resistance is used as the tube, there is no hole in the tube even when used under severe conditions.

[0008]

【Example】

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

FIG. 1 is a sectional view showing an example of the arc resistant hose of the present invention, in which a flame resistant fiber layer 2 is provided on an outer layer of a fluororesin tube 1.

FIG. 2 is a cross-sectional view showing another example of the arc-resistant hose of the present invention. The flame-resistant fiber layer 2 is provided on the outer layer of the fluororesin tube 1, and the flame-resistant fiber layer 2 has a flame-retardant property. Varnish 3 is applied.

Examples of the fluororesin used in the fluororesin tube 1 include polytetrafluoroethylene (PTFE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene / hexafluoropropylene copolymer. Examples thereof include polymers (FEP). The fluororesin tube 1 is usually molded to a thickness of 0.5 to 2 mm.

Further, examples of the flame resistant fiber used in the flame resistant fiber layer 2 include glass fiber, metal fiber, carbon fiber, and the like, and acrylonitrile-based carbon fiber is particularly preferable because it has excellent flame resistance. The flame resistant fibers may be used alone, or two or more kinds of flame resistant fibers may be mixed and used.

The flame resistant fiber layer 2 is formed on the outer layer of the fluororesin tube 1 by winding, braiding or the like. Alternatively, the tube 1 may be pre-braided.

It is preferable to apply the flame-retardant varnish 3 on the surface of the flame-resistant fiber layer 2 because the flame-resistant fiber layer 2 is prevented from being dispersed and the handleability is improved.

Examples of the flame-retardant varnish 3 include silicone-based flame-retardant varnish and alkyd-based flame-retardant varnish.

A polytetrafluoroethylene tube having an inner diameter of 4 mm and a thickness of 1 mm is braided with acrylonitrile-based flame-resistant fiber in a thickness of 5 mm, and a hose having a silicone-based flame-retardant varnish applied thereto is connected to an automobile arc. When used as an air pipe hose (normal pressure 10 kgf / cm ² ) in the welding machine, the heat resistance temperature was doubled as compared with the conventional arc resistant hose, and the hose damage due to heat was significantly reduced.

[0017]

[Effect of device]

 The arc-resistant hose of the present invention has a high heat-resistant temperature, the damage due to heat is significantly reduced, the corrosion resistance and the chemical resistance are improved, and the durability is excellent. It is also used for the pipes for various chemicals and solvents. It is possible to provide a versatile arc resistant hose that can be used.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an arc resistant hose of the present invention.

FIG. 2 is a cross-sectional view showing another example of the arc resistant hose of the present invention.

[Explanation of symbols]

 1 Fluororesin tube 2 Flame resistant fiber layer 3 Flame retardant varnish

Claims (2)

[Scope of utility model registration request] 1. An arc-resistant hose having a flame-resistant fiber layer as an outer layer of a fluororesin tube. 2. The arc-resistant hose according to claim 1, wherein a flame-retardant varnish is applied to the surface of the flame-resistant fiber layer.