JPS635858Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating device for heating and shrinking a heat-shrinkable sleeve placed over the outer periphery of a tube, and has a particularly simple mechanism that facilitates attachment and detachment to the tube.

In general, pipelines with anti-corrosion coating, such as pipelines in which steel pipes with anti-corrosion coating are sequentially welded,
Each weld is covered with a heat-shrinkable plastic tube or tape to form a sleeve, which is heat-shrinked to protect the weld from corrosion.

Conventionally, propane torches or prefabricated annular heaters have been used to heat-shrink heat-shrinkable sleeves attached to steel pipes, but construction using a propane torch requires skill in the heat-shrinking work, and is also sensitive to wind, temperature, etc. The drawback is that it is affected by the external environment, and assembly type annular heaters take time to install and remove.
It had the disadvantage of poor work efficiency.

In view of this, the present inventors developed a heating device equipped with a trolley that ran on the top of the tube, and patent application
It was proposed as No. 160134. This device consists of a trolley that rides on the top of the tube, an annular heater that surrounds and heat-shrinks the heat-shrinkable sleeve on the tube, and a fixed fixture that prevents the trolley from moving when heating the heat-shrinkable sleeve. The annular heater was supported between the front and rear wheels of a truck, and it was a very effective device for long pipelines because it could be easily moved on the pipe. However, the traveling truck and fixed rails are large-scale, heavy, and costly, and there are also disadvantages in that it takes time to attach and detach the device.

In view of this, the present invention was developed after further consideration.
We have developed a heating device for tube-covering heat-shrinkable sleeves that has a simple mechanism and can be attached and removed accurately and easily. The heater is rotatably connected at the upper end and can be opened and closed at the lower end to the left and right, and has arms that come into contact with the sleeve mounting tube from near the connecting parts at both front and rear ends of the heater, and arms that come into contact with the sleeve mounting tube from the connecting parts to the left and right. A strut that abuts the sleeve-attached tube from a symmetrical position apart and holds both the heaters coaxially with the tube is provided to protrude inwardly, and a strut that is symmetrically located outside the center of gravity of the heater is provided on the outer frame of the two heaters. It is characterized by a hanging metal part provided at the position.

This will be explained in detail below using the drawings.

1 and 2 show an embodiment of the heating device of the present invention. In the figures, a indicates a tube into which a heat-shrinkable sleeve is inserted, and 1a and 1b indicate the inner side that covers the sleeve insertion tube a. 2 shows a pair of left and right heaters having a semi-cylindrical shape, for example, heat dissipating concave surfaces 2a and 2b using far infrared rays as a heat source. It can be opened and closed freely. Both heaters 1a, 1
Arms 4a and 4b abutting on the sleeve insertion tube a are protruded inward from the vicinity of the connecting portions at both front and rear ends of b so as to be rotatable left and right, and both arms 4a and 4b are connected by a spring 5, and the connection Both the heaters 1a and 1b are connected to the sleeve insertion tube a by contacting the sleeve insertion tube a from symmetrical positions left and right away from the sleeve insertion tube a.
Supports 6a and 6b that hold the heaters 1a and 1b coaxially with the heaters 1a and 1b are provided to protrude inwardly, and the heaters 1a and 1b
A hanging metal part 7a is placed at a symmetrical position outside the center of gravity of b.
7b is provided.

In the figure, 11 is a lock mechanism that prevents the lower ends of both heaters from opening to the left and right during the process of heat-shrinking the heat-shrinkable sleeve, and 12 is an outlet that supplies current to the heater built into the semi-cylindrical concave heat dissipation surface. shows.

The heating device of the present invention has the above-mentioned configuration, and when the whole is lifted up by attaching ropes to the hanging fittings 7a, 7b as shown in FIG.
Since the position of b is outside the center of gravity of the heaters 1a and 1b, the lower ends of both the heaters 1a and 1b automatically open to the left and right, allowing them to be easily removed from the heat-shrinkable sleeve cladding tube a. In addition, in order to attach a heat-shrinkable sleeve to the tube a equipped with the sleeve, by lowering both the heaters 1a and 1b that have been lifted up as described above, the arms 4a and 4b are attached to the sleeve attached tube a, as shown in FIG. When it touches and lowers further, both heaters 1
The lower ends of the heaters 1a and 1b are closed, and the supports 6a and 6b are in contact with the sleeve mounting tube a, and both heaters 1a and 1b are closed.
can be easily arranged coaxially with the sleeve mounting tube a.

In addition, in order to adjust the opening degree of the lower end when both heaters are lifted up, stoppers 10a and 10b using the link mechanism 9 and both arms 4a and 4b are provided on both arms 4a and 4b as shown in the figure, or Although not shown in the drawings, it is desirable to provide appropriate stoppers on the outer frames of both heaters 1a and 1b. Also both arms 4a, 4b
If there is a risk of damaging the anti-corrosive coating layer on the tube a and/or the attached heat-shrinkable sleeve due to contact between the support columns 6a and 6b and the sleeve-equipped tube a, install rollers on both arms and the tip of the support column. Alternatively, a shock absorber may be provided. Further, if there is a possibility that the anti-corrosion coating layer of the tube body may be affected by heat when the heat-shrinkable sleeve is heat-shrinked, a heat shielding plate may be provided at this portion.

In this way, the heating device of the present invention has a simple mechanism, so it does not cause any malfunctions, can be easily attached to and removed from the pipe to be heated, and has remarkable effects such as being able to reduce the weight of the device. It is something.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the device of the present invention; Figure 1 is a front view, Figure 2 is a side view, and Figure 3 shows the device in the lifted state shown in Figure 1. FIG. a...Heat-shrinkable sleeve attachment tube, 1a, 1b...
... Heater, 2a, 2b ... Heat dissipation concave surface, 3 ... Chimney, 4a, 4b ... Arm, 5 ... Spring, 6a, 6b ... Support column, 7a, 7b ... Hanging metal part, 8 ... Lifting rope .

Claims (1)

[Scope of utility model registration request] A pair of left and right heaters each having a semi-cylindrical concave heat dissipating surface on the inside that covers a tube fitted with a heat-shrinkable sleeve are rotatably connected at the upper end, and the lower end can be opened and closed to the left and right. an arm that comes into contact with the sleeve mounting tube from near the connecting portions at both the front and rear ends of the device;
A strut is provided to protrude inwardly from a target position left and right away from the connecting portion to abut the sleeved tube and hold both the heaters coaxially with the sleeved tube, and the outer frame of both the heaters A heating device for a tube-coated heat-shrinkable sleeve, characterized in that a hanging metal part is provided at a target position outside the center of gravity of the heater.