JPS599863Y2 - Synthetic resin pipe heating device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pipe heating device used when bending a joint resin pipe, particularly at a piping site.

Methods of heating and softening the pipe when bending a composite resin pipe include heating the outer surface of the pipe with a torch lamp or gas burner, or immersing the pipe in a heated oil bath.

The former method is simple, but it requires a high degree of heat kneading to uniformly heat and soften, which tends to cause uneven heating such as overheating, and it also takes a long time to heat and has poor workability, especially for medium and large diameters. Not practical for pipes.

Furthermore, piping sites and the like are easily affected by the weather.

In the latter case, the device is large-scale and cannot be easily used at piping sites.

This invention was made in view of the above points, and the purpose is to provide a synthetic resin pipe heating device that can be easily used at piping sites and the like.

The gist of this invention is that the resin tube is made up of a heating tube that heats it from the outside and a rod-shaped heating element that heats it from the inside. is provided so that the resistance heating element is positioned below when it is fitted into the synthetic resin pipe, and the rod-shaped heating element has a portion along its axial direction where the resistance heating element is not provided. A part of the rod-shaped heating element is located above the plastic tube when it is inserted into the plastic tube.

Next, this invention will be explained with reference to embodiments of the drawings.

Reference numeral 1 denotes a rod-shaped heating element for inserting into the resin pipe A to heat it from the inner surface, and is composed of a rod-shaped element 11 and a resistance heating element 12 attached around the rod-shaped element 11.

The resistance heating element 12 is band-shaped and is not attached to the entire circumference of the rod-shaped body 11, but is attached to all but one surface, and when inserted into the resin A, the resistance heating element 12
The free part is located above, and the resin pipe A
The upper tube wall of the tube is heated uniformly without being overheated.

Reference numeral 2 denotes a heating cylinder that fits over the synthetic resin pipe A and heats it from the outside surface, and is made up of a cylinder body 21 in the shape of an unequal hexagonal cylinder and a resistance heating element 22 attached to one side of its inner surface. Become.

Then, the resistance heating element 22 is fitted into the resin pipe A so as to face downward.

Note that 23 is a lid provided at both ends of the cylinder body 21 to shut off the inside, and 3 is a sealing lid provided on the rod-shaped heating element 1.

Further, 4 is a support rod for preventing the synthetic resin pipe A from sagging when heated.

As described above, the rod-shaped heating element 1 is inserted approximately into the center of the resin pipe A with the surface on which the resistance heating element is not provided facing upward.
The heating cylinder 2 is fitted into the resin pipe A with the resistance heating element 22 facing downward.

The resistance heating element 12.22 is connected to a power source, and the resin tube A is heated from the inside and outside.

At this time, the heating cylinder 2 and the rod-shaped heating element 1 are not provided with a resistance heating element in the upper part, so that the upper part of the heating cylinder 2 or the upper part of the joint or resin tube A does not become particularly high in temperature during heating, and the temperature is uniform. temperature, and the synthetic resin pipe A is heated uniformly from the inner and outer surfaces.

After a predetermined period of time has elapsed, the heated and softened resin tube A is taken out and used for bending or the like.

As mentioned above, this invention heats the resin pipe from its inner and outer surfaces using a heating cylinder and a rod-shaped heating element, so it is efficient and can be used even in outdoor piping sites, even in weather conditions such as rain and wind. In addition, the heating cylinder and rod-shaped heating element are arranged to avoid the upper part from becoming hot, rather than installing a resistance heating element on the entire surface, so that the resin pipe can be heated evenly from the inner and outer surfaces. Can be softened.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of an example of this invention, and FIG. 2 is a sectional view taken along line II--II in FIG. 1... Rod-shaped heating element, 12... Resistance heating element, 2... Heating cylinder, 22... Resistance heating element, A... Combined resin pipe.

Claims (1)

[Scope of utility model registration request] It consists of a heating cylinder that heats the synthetic resin pipe from the outside and a rod-shaped heating element that heats it from the inside. When fitted into the resin pipe, the resistance heating element is positioned below, and the rod-shaped heating element has a portion along its axial direction where no resistance heating element is provided, and this portion is connected to the resin tube. A synthetic resin pipe heating device that is positioned above the pipe when inserted into the pipe.