JPS5933614Y2 - Heat shrink tube heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating device for heat shrinkable tubes.

Traditionally, heat shrink tubes are heated using gas torch lamps,
Gasoline torch lamps or hot plasters, which heat sucked air with a heating wire and blow it out, were used, but since the flame temperature of torch lamps reaches over 1000°C, the surface of the heat shrink tube was burned out. It was easy to do, but required skill.

In addition, since hot plaster heats air and blows out the heated air, only a small portion of the hot air contributes to heating the heat shrink tube, resulting in extremely low thermal efficiency. In outdoor environments, it takes a long time to shrink, which has the disadvantage of poor work efficiency.

In view of the above points, the present invention provides a heat-shrinkable tube heating device that can uniformize heating and improve work efficiency without burning out the surface of the heat-shrinkable tube or requiring skill in the work. The drawings will be described in detail below.

FIG. 1 shows an embodiment of the present invention, in which 1 is a heat shrink tube;
2 is an object that covers the heat shrink tube 1; 3 is an annular heater having a heating element 3b such as a heating wire on the inner wall surface of an annular reflecting plate 3a; 4 is a drive mechanism for the annular heater, and 4 is a support rod for the annular heater; Belt or chain 6 that attaches and supports 5
, a pulley 7.8, and a drive motor 9.

Reference numeral 10 denotes a sensor support rod, which is provided on a lever 11 for moving the support rod 10, and has limit switches at both ends that determine the range in which the heater 3 is reciprocated by rotating the drive motor 9 in forward and reverse directions. A proximity sensor 12.13 of the heater support rod 5 is attached.

Reference numeral 14 denotes a substrate, in which a long hole is provided so that the heater support rod 5 can move within the heating range.

Reference numeral 15 indicates a heating section cover, and 16 indicates a drive section cover. The drive section cover 16 is provided with a long hole so that the lever 11 can be moved.

Figure 2 shows an electrical system diagram, 17 is a power supply, 18 is a power switch, 19 is a motor drive rectifier circuit, and 20 is a sensor 1.
2. A relay circuit controlled by a flip-flop circuit 20 that sends on/off signals according to signals from 13, 22 is a relay contact that switches to reverse the polarity of the drive power source for the motor 9, and is connected to one side by a spring or the like. However,
When the relay coil is energized, it switches to the opposite side.

When heating a heat shrink tube using the device of the present invention, first use the lever 11 to connect the sensors 12 and 13 to the heat shrink tube 1.
When the heater is moved to the heating start position and the power switch is turned on, the heating element 3b of the heater is energized, the motor 9 is driven at the same time, the heater 3 runs, and when the heater support rod 5 comes into contact with the sensor 12 or 13, the flip-flop is activated. The output of the pull circuit 20 is turned on or off, the on/off state of the relay circuit 21 is reversed, the polarity of the drive voltage of the motor 9 is reversed, and the direction of rotation of the motor 9 is reversed.

This operation is repeated every time the heater support rod 5 contacts the sensor 12, 13, so the heater 3 gradually heats the heat shrink tube 1 without reciprocating.

While monitoring the state of contraction, the heating section is moved to the uncontracted part using the lever 11, so that the entire body is contracted.

The movement of the lever 11 can be carried out stepwise or continuously.

As shown in FIG. 3, a polyethylene jacket 2 is placed on the core wire 25.
6, the end of the polyethylene sleeve 28 passed between the cable sheaths 26 on both sides and the ethylene ethyl wrapped around the sheath 26 alternately. The apparatus of the present invention is used to heat-shrink a cross-linked polyethylene heat-shrinkable tube 1 for covering a layer 29 of a hot-melt adhesive tape made of acrylate copolymer or the like between the jacket 26 and the sleeve 28. (In this case, the inner diameter was 120 mm and the width was 30 mm.
(Using an annular heater with a power of 900 W and a running speed of the heater of 25 mm/sec and a reciprocating width of 100 mm), the variation in heating temperature was extremely small at 10 to 15 °C, there were no bubbles or burnout, and the heating time was Very good shrinkage was obtained in less than 10 minutes.

In such a cable connection part, it is necessary to heat the temperature of the heat-melting adhesive tape overlapping layer 29 to 130° C. or higher.
On the other hand, in order to prevent the surface of the heat-shrinkable tube from being burnt out, the upper limit temperature needs to be 170° C. or less, but the apparatus of the present invention can sufficiently perform heating that requires such high temperature accuracy.

As described above, according to the present invention, since the annular heater is reciprocated, the heat-shrinkable tube is heated uniformly, its surface is not burnt out, and no skill is required at all. It has significantly higher thermal efficiency than hot plaster, increasing work efficiency, and because it can heat and shrink small areas one by one by moving the reciprocating position of the heater, it prevents air bubbles from forming inside the heat-shrinkable tube. You can prevent it from remaining.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is an electrical system diagram, and FIG. 3 is a cross-sectional view of a communication cable connection portion in which an experiment was conducted using the device of the present invention. DESCRIPTION OF SYMBOLS 1... Heat shrink tube, 3... Annular heater, 4... Drive mechanism, 10... Sensor support rod, 11... Lever, 12. 13...Sensor.

Claims (1)

[Scope of utility model registration request] An annular heater surrounding a heat-shrinkable tube to be heated; a drive mechanism for driving the heater to reciprocate in the length direction of the tube; means for moving the support of the rain sensors in the lengthwise direction of the tube; and means for moving the heater each time each of the sensors generates a signal. A heat shrinkable tube heating device comprising: a control circuit that controls the drive mechanism to reverse the direction.