KR100706487B1 - Delivering apparatus for preventing heat shrinkable tube from elongating - Google Patents

Abstract

The present invention relates to an anti-stretch transfer device capable of preventing the heat shrink tube from being stretched in the longitudinal direction during the manufacture of the heat shrink tube. The conveying apparatus 10 according to the present invention is a pair of feed rollers which are arranged up and down on a conveying path of the heat shrink tube 1 between the heating device 5 and the expansion device 7 to convey the tube 1. (11, 12) and a servomotor (31) for rotationally driving the feed rollers (11, 12) in a variable speed. Power transmission to the servomotor 31 and the feed rollers 11 and 12 is connected to the output shaft of the servomotor 31 and the worms 41 and 42 extending in a direction perpendicular to the feed path of the tube 1. , By the worm wheels 43 and 44 engaged with the worms 41 and 42 in a state in which the feed roller 11 is coupled to one side. In addition, the conveying apparatus 10 is a ball screw 50 and a ball screw (50) extending in a direction perpendicular to the conveying path of the tube 1, so as to adjust the distance between the pair of conveying rollers (11, 12) 50 is fastened so as to be lifted and provided with ball nuts 61 and 62 on which one side of the worm wheels 43 and 44 are rotatably coupled. According to this conveying apparatus 10, by adjusting the conveying speed of the tube 1 between the heating device 5 and the expansion device 7, the longitudinal stretching is performed by using the speed ratio before and after the expansion of the tube 1. Occurrence can be prevented or adjusted.

Heat Shrink, Tube, Expansion, Feed, Stretch, Speed, Adjustable

Description

Delivering apparatus for preventing heat shrinkable tube from elongating}

1 is a block diagram of a conventional heat shrink tube manufacturing equipment.

Figure 2 is a block diagram of a heat shrink tube manufacturing equipment applied to the transfer apparatus according to the present invention.

3 is a perspective view of a conveying apparatus according to the present invention;

<Explanation of symbols for the main parts of the drawings>

1: tube 3: caterpillar

5: heating device 6: guide roller

7: expansion device 9: take-up roller

10: feed device 11, 12: feed roller

31: servomotor 41, 42: worm

43, 44: worm wheel 50: ball screw

61, 62: Ball Nut

The present invention relates to a heat shrink tube stretching prevention transfer device used in the manufacturing equipment of the heat shrink tube, and more particularly, by stretching the heat shrink tube heated in the heating apparatus at a predetermined speed to the expansion device excessive stretching of the heat shrink tube (延伸) relates to a transfer device for preventing.

The heat shrink tube is made of a cross-linked polymer synthetic resin, and when heat is applied, the heat shrink tube contracts at a predetermined rate to be in close contact with an object to be insulated, and is used for electrical insulation, waterproofing, and device protection.

Therefore, the heat shrink tube is commercialized in a state in which the crosslinked wire rod is expanded to a predetermined size, and an example of a conventional manufacturing facility used therein is shown in FIG. 1.

As shown in FIG. 1, the conventional manufacturing equipment includes a caterpillar 3 which draws out and conveys the tube 1 in a state of being wound in a feed-off (not shown) through an extrusion and crosslinking process. And an expansion device (7) for heating the tube (1) transferred from the caterpillar (3), an expansion device (7) for expanding the tube (1) exiting the heating device (5) to a predetermined diameter; It consists of a take-out roller 9 for discharging the tube 1.

The heating device 5 is composed of a chamber filled with a hot liquid heating medium such as glycerin. The tube 1 is deformably flexible by heat exchange with the heating medium while passing through the heating device 5 while being immersed in the heating medium. On the other hand, in order to prevent the tube 1 from floating on the heating medium by buoyancy when passing through the heating device 5, the heating device 5 includes a plurality of guide rollers 6 along the upper feed path of the tube 1. Are rotatably installed.

The expansion device 7 is configured to generate a vacuum suction input therein to expand the tube 1. When the tube 1 heated in the heating device 5 passes through the expansion device 7, the vacuum suction input generated in the expansion device 7 causes the tube 1 to expand in all directions to increase in diameter. An example of such an expansion device is disclosed in Korean Patent Laid-Open No. 2004-75266, and thus detailed description thereof will be omitted.

As described above, in the conventional manufacturing equipment, the tube 1 is conveyed by the driving force of the caterpillar 3 and the take-out roller 9 before and after the heating device 5 and the expansion device 7, and the caterpillar 3 and the take-out Since the distance between the rollers 9 is long, there was a problem that excessive stretching occurred in the longitudinal direction in the tube 1 during conveyance. In this way, when longitudinal stretching occurs in the tube 1 while passing through the heating device 5 and the expansion device 7, the feeding speed of the tube 1 is relatively slowed, and thus, in the longitudinal direction. There was also a problem that the stretched tube 1 stagnated in the heating apparatus 5 and was pinched between the guide rollers 6 due to buoyancy. On the other hand, when the diameter of the tube 1 is large or the conveying speed is increased, the longitudinal stretching of the tube 1 becomes more excessive, resulting in the limitation of the conveying speed of the tube 1, and a problem of poor quality occurs. Done.

The present invention has been developed to solve the above problems, an object of the present invention is to provide a conveying device that can prevent and adjust the longitudinal stretching of the tube by adjusting the conveying speed of the tube between the heating device and the expansion device.

An object of the present invention as described above, a pair of feed rollers which are arranged up and down on the transfer path of the heat shrink tube between the heating device and the expansion device for conveying the tube, and the servo drive to rotate the feed roller in a variable speed It is achieved by providing a transfer device comprising a motor.

In addition, the conveying apparatus of the present invention may further include a spacing adjusting means for adjusting the spacing between the conveying rollers to be applicable to a tube of various diameters. The gap adjusting means includes a ball screw extending in a direction perpendicular to the feed path of the tube, and a ball nut which is fastened to the ball screw in a state connected to the feed roller.

In addition, the transfer apparatus of the present invention is a worm connected to the output shaft of the servo motor and extending in a direction perpendicular to the transfer path of the tube for transmitting power from the servo motor to the transfer roller, and the transfer roller on one side It may include a worm wheel engaged with the worm in a coupled state.

In this case, the gap adjusting means, the ball screw extending in the direction perpendicular to the conveying path of the tube, the ball nut is fastened so as to be lifted on the ball screw, the other side of the worm wheel rotatably coupled to one side It may include.

On the other hand, in one embodiment of the present invention, a plurality of the worms are formed side by side to correspond to each of the pair of feed rollers, the worms in the opposite direction to each other so that the feed rollers rotate in the opposite direction Can have

In addition, a plurality of ball nuts may be formed in parallel to correspond to each of the pair of feed rollers. In this case, the ball screw has a fastening portion of each ball nut such that the ball nuts are elevated in opposite directions according to their rotation. It has a spiral shape opposite to each other.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 2 is a view showing a schematic configuration of a heat shrink tube manufacturing equipment to which the transfer apparatus according to the present invention is applied. In FIG. 2, the same reference numerals are given to the same components as those of the manufacturing facility of FIG. 1, and a detailed description thereof will be omitted.

As shown in FIG. 2, the manufacturing apparatus to which the present invention is applied includes a caterpillar which draws out and conveys the tube 1 in a state of being wound in a feed-off (not shown) through an extrusion and crosslinking process ( 3), a heating device 5 for heating the tube 1 conveyed from the caterpillar 3, an expansion device 7 for expanding the tube 1 exiting the heating device 5 to a predetermined diameter, A take-out roller 9 for discharging the expanded tube 1 is provided. The heating device 5 is composed of a chamber filled with a hot liquid heating medium such as glycerin.

The tube 1 is flexible to be expandable in a subsequent expansion device 7 by heat exchange with the heating medium while passing through the heating device 5 while being immersed in the heating medium. On the other hand, in order to prevent the tube 1 from floating on the heating medium by buoyancy when passing through the heating device 5, the heating device 5 includes a plurality of guide rollers along the upper feed path of the tube 1 ( 6) are rotatably installed. The expansion device 7 consists of a vacuum chamber, which expands the diameter of the tube 1 by the vacuum suction input when the tube 1 passes through the inside thereof.

Between the heating device 5 and the expansion device 7, a conveying device 10 of the present invention for supplying the tube 1 heated in the heating device 5 to the expansion device 7 is installed.

The feeder 10 is interlocked with a pair of feed rollers 11 and 12 for feeding the tube 1 and a pair of feed rollers 11 and 12 by rotating in contact with the top and bottom of the tube 1. And a servo motor 31 for rotating.

As shown in FIG. 3, power transmission from the servomotor 31 to the transfer rollers 11 and 12 is performed by worms 41 and 42 and worm wheels 43 and 44. That is, a pair of worms 41 and 42 are coupled to the output shaft of the feeding motor 31 in a direction perpendicular to the feeding direction of the tube 1, and a feed roller 11 is connected to the pair of worms 41 and 42. 12 and the worm wheels 43 and 44 coaxially engaged respectively. The pair of worms 41 and 42 have a spiral structure (right screw / left screw) in opposite directions, so that the pair of worm wheels 43 and 44 rotate in opposite directions according to the drive of the servomotor 31. Done. Accordingly, the conveying rollers 11 and 12 also rotate in opposite directions to convey the tubes 1 sandwiched therebetween along the advancing direction.

In addition, the conveying apparatus 10 according to the present invention, as a means for adjusting the distance between the pair of rollers (11, 12), the ball screw installed to be rotatable in parallel with the worms (41, 42) ( 50 and a pair of ball nuts 61 and 62 fastened to the ball screw 50 so as to be lifted and lowered. Worm wheels 43 and 44 are rotatably coupled to the side surfaces of the ball nuts 61 and 62, respectively. The ball screw 50 has a fastening portion 51, 52 of each ball nut 61, 62 in a spiral shape opposite to each other so that the ball nuts 61, 62 are lifted in opposite directions according to their rotation. Therefore, when the ball screw 50 rotates, the ball nuts 61 and 62 are lifted in opposite directions, and accordingly the worms 41 and 42 are also lifted, thereby spacing between the feed rollers 11 and 12. This narrows or moves away. Such rotation of the ball screw 50 may be made by a separate motor (not shown), or may be made by manual operation. In this way, by rotating the ball screw 50, by adjusting the interval between the feed rollers (11, 12) it is possible to transfer the tube (1) of various diameters.

In this transfer device 10 by adjusting the rotational speed of the feed rollers (11, 12), to prevent the longitudinal stretching of the tube (1), or to adjust the amount of stretching. That is, when the rotational speed of the feed rollers 11 and 12 is increased while the rotational speed of the take-up roller 9 is fixed, the transportation speed of the tube 1 drawn into the expansion device 7 is increased by the expansion device 7. The longitudinal elongation is reduced by being faster than the feeding speed of the tube (1) inflated out from), on the contrary, if the rotational speed of the feeding rollers (11, 12) is reduced, the tube (1) introduced into the expansion device (7) As the conveying speed of the tube 1 which expands out of the conveying speed becomes faster, the longitudinal stretching is increased.

In the above embodiment, a configuration in which a pair of feed rollers 11 and 12 are simultaneously rotated and driven by the servo motor 31 and lifted at the same time to adjust the spacing, but only one feed roller 11 is a servo Receiving power from the motor 31 and at the same time can be configured to move up and down, the other feed roller 12 may be configured to follow and rotate in place.

As described above, according to the present invention, by adjusting the feed rate of the tube between the heating device and the expansion device, it is possible to prevent or control the occurrence of longitudinal stretching by using the speed ratio before and after the expansion of the tube. Therefore, the production speed of the tube can be increased and good quality can be obtained.

In the above, certain preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. will be.

Claims (7)

A pair of feed rollers 11 and 12 disposed up and down on a transfer path of the heat shrink tube 1 between the heating device 5 and the expansion device 7 to feed the tube 1, and the feed roller A transfer apparatus for a heat shrink tube, characterized in that it comprises a servo motor (31) for rotationally driving the variable speed (11, 12). The method of claim 1, Transfer device of the heat shrink tube, characterized in that it further comprises a gap adjusting means for adjusting the gap between the feed rollers (11, 12). The method of claim 2, The worm 41 is connected to the output shaft of the servo motor 31 and extends in a direction perpendicular to the transfer path of the tube 1, and the worm 41 in a state in which the feed roller 11 is coupled to one side. Transfer device for a heat shrink tube further comprises a worm wheel (43) engaging with. The method of claim 2, The gap adjusting means, A ball screw 50 extending in a direction perpendicular to the feed path of the tube 1 and a ball nut 61 which are fastened to the ball screw 50 in a state of being connected to the feed roller 11. Transfer device of the heat shrink tube, characterized in that it comprises a. The method of claim 3, wherein The gap adjusting means, The ball screw 50 extending in a direction perpendicular to the conveying path of the tube 1 and the ball screw 50 to be elevated on the ball screw 50, the other side of the worm wheel 43 is rotatably coupled to one side Transfer device for heat shrink tube, characterized in that it comprises a ball nut (61). The method of claim 3, wherein The worms 41 and 42 are formed in plural in parallel to correspond to the pair of feed rollers 11 and 12, and the worms 41 and 42 rotate in opposite directions. 42) is a transfer device of the heat shrink tube, characterized in that having a spiral in the opposite direction to each other. The method according to claim 4 or 5, The ball nuts 61 and 62 are formed in plural in parallel to correspond to the pair of feed rollers 11 and 12, and the ball screw 50 is formed by the ball nuts 61 and 62 according to their rotation. The fastening part (51, 52) of each ball nut (61, 62) so as to be lifted in the opposite direction to each other, characterized in that the transfer device of the heat-shrinkable tube, characterized in that it has a spiral shape in the opposite direction.

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