JPH0589779A - Tubular bulb heating method and apparatus - Google Patents

Abstract

PURPOSE:To provide a tubular bulb heating method and its apparatus to heat the whole heating parts uniformly while compensating the difference of heating conditions in the outside part of a tubular bulb in the most external side and those in the other heating parts at the time of heating aligned tubular bulbs from the direction at a right angle to the aligned direction. CONSTITUTION:A tubular bulb heating method is a method to heat aligned tubular bulbs 51, 51 from the direction at a right angle to the direction and while setting heating condition compensating parts 30, 30 in the outside of the tubular bulbs 51, 51 located in the most external side among the tubular bulbs 51, 51 in the same distance (d) as that between neighboring tubular bulbs 51, 51 the tubular bulbs 51, 51 together with the heating condition compensating parts 30, 30 are heated. Or, aligned tubular bulbs 51, 51 are put in the outside of the tubular bulbs 51, 51 located in the most external side among the tubular bulbs 51, 51 to be heated from rectangular direction to the aligned direction and the heating condition compensating parts 30, 30 are put in the same direction (d) as that between the neighboring tubular bulbs 51, 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of heating a tube and an apparatus for carrying out the method, and more particularly, to a method of aligning tubes that are closely aligned and simultaneously heated from a direction orthogonal to the alignment direction. By compensating for the difference in heating conditions that occurs between the outer part of the outer bulb and other heating parts,
The present invention relates to a method of heating a tube in which all the heating parts of the tube, including the outer portion, are heated substantially uniformly, and an apparatus for carrying out the method.

[0002]

2. Description of the Related Art Conventionally, a pinch seal for sealing a valve and a mount has been widely used for sealing a small bulb after heating an open end of the valve pipe and pressing and crushing the heated portion with a pincher. Has been adopted. This pinch seal is
A good sealing shape is always obtained when performing on one tube end, but two tube ends can be sealed at the same time, for example when pinching a small U-shaped fluorescent lamp. When wearing, there is a problem that the sealing shape is not stable.

To further explain the above problem with reference to FIGS. 4 and 5, both tube ends 51, 51 of the U-shaped bulb 50 of the U-shaped fluorescent lamp are aligned and opposed to each other, but the inner part 5 thereof is arranged.
The two are opposed to each other at a narrow distance d such as several millimeters, for example, 2.5 millimeters. Such tube ends 51,
When 51 is heated by the burner 53, the inner space 52, 52 and the outer space 54, 54 are affected by the narrow gap.
Since the burners 53 have different contact conditions, and in the inner portion 52, the mutually opposing pipe end portions have a thermal influence on each other, the inner portion 52 and the outer portion 54 are uniformly heated due to the different heating conditions. Instead, a temperature difference occurs. As a result, the degree of shrinkage of the valve differs between the inner part 52 and the outer part 54, and the problem arises that the sealing shape (pinch-sealed shape) is not constant.

That is, according to the conventional method of heating a tube,
When a plurality of aligned bulbs (including not only the bulb but also mounts and other members) may be heated, the outermost portion of the bulb and the outermost portion of the bulb may be heated. Due to the difference in the above-mentioned heating conditions, the heated state is not the same between the inner part of the container and the heating part of another tube, and a difference in the degree of shrinkage occurs.
Therefore, there is a problem that a product with stable quality cannot be obtained in the subsequent process.

[0005]

As described above, when the aligned tubes are heated by the conventional heating method, the outermost portion of the outermost bulb and the innermost portion of the outermost bulb are heated. There is a problem in that the product is not uniformly heated due to the difference in the heating conditions from the heating part of the other tube and the degree of shrinkage is different, and a product of stable quality cannot be obtained.

Therefore, an object of the present invention is to make the heating conditions the same for all the heating parts of the aligned bulbs when heating the aligned bulbs from the direction orthogonal to the alignment direction. It is an object of the present invention to provide a method for heating a tube and a device for carrying out the method, in which the heating section of (1) is heated uniformly to obtain a product of stable quality.

[0007]

In order to achieve the above object, a method of heating a tube according to the present invention is a method of heating a tube in which aligned tubes are heated in a direction orthogonal to the alignment direction. There, the heating condition compensating member is placed at the outer side of the outermost one of the above-mentioned tubes, and the heating condition compensating member is arranged at a distance equivalent to that of the adjacent tube. It is characterized by being heated.

The tube heating apparatus of the present invention is a tube heating apparatus for heating aligned tubes in a direction orthogonal to the alignment direction, and is located on the outermost side of the tubes. It is characterized in that the heating condition compensating member is arranged outside the tube, and the heating condition compensating member is arranged at a distance equivalent to that of the adjacent tube.

[0009]

In the method of the present invention, the heating condition compensating member is positioned outside the outermost bulb of the aligning bulbs, and the heating condition compensating member and the respective bulbs are aligned at the same intervals. , Since the tube including the heating condition compensating member is heated, the presence of the heating condition compensating member causes the burner to hit the tube and the thermal interaction between the facing parts of the tube, The heating part of all tubes
The heating conditions are almost the same. As a result, all the heating parts can be made to have substantially the same degree of shrinkage, and a product of constant quality can be obtained in post-processing.

Further, in the tube heating apparatus of the present invention, since the heating condition compensating member is arranged at a predetermined interval for compensating for the heating condition of the aligned tube, the aligned tube is treated as the heating condition compensating member. By inserting and positioning in between, the heating conditions of the alignment tube are immediately compensated. Therefore, the method of the present invention can be carried out with high efficiency.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective explanatory view showing a heating process of an embodiment of the apparatus of the present invention, FIG. 2 is a view explaining a heating action of a burner as seen from the direction of arrow F in FIG. 1, and FIG. 3 is a perspective explanatory view showing a pinch process. 4 is a perspective explanatory view showing a heating process of the conventional pinch seal device, and FIG. 5 is a heating operation explanatory view of the burner as seen from the direction of arrow G in FIG.

In the illustrated embodiment, the present invention is applied to a pinch seal device for a U-shaped fluorescent lamp (compact fluorescent lamp). Therefore, the bulb bulb has a U-shape, and the aligned bulb bulb has two bulbs, and these two bulbs are the outermost bulbs at the same time. Further, the heating portion is a tube end portion, and a mount is inserted and supported at the tube end portion although not shown. Further, in the present specification, the term “bulb” includes various types such as a valve and a valve provided with a mount.

The tube heating method according to the present invention is a tube heating method for heating aligned tubes 51, 51 from a direction orthogonal to the alignment direction. The heating condition compensating members 30, 30 are arranged outside the outermost tubes 51, 51 and at the same distance d as the adjacent tubes 51, 51. This is a method in which the tube 51 including 51 is heated.

The tube heating apparatus of the present invention is for implementing the tube heating method of the present invention, and is a tube for heating the aligned tubes 51, 51 from a direction orthogonal to the alignment direction. A heating device for a sphere, which is positioned outside the outermost tube 51, 51 of the tubes 51, 51 and is heated to a distance d equivalent to that of the adjacent tubes 51, 51. The compensation members 30 and 30 are arranged and configured.

More specifically, FIG. 1 shows a heating process of the pinch seal device of the present embodiment, in which a U-shaped valve 50 held by a valve holder (not shown) is arranged in a direction orthogonal to the alignment direction. A pair of parallel burners 1 facing each other
1, 12 are provided. The burners 11 and 12 are symmetrically moved toward and away from the valve 50 by a mechanism (not shown). That is, when the burner 11 moves in the direction of arrow AB, the burners 12 move in the direction of arrow DC and approach each other, and when the burner 11 moves in the direction of arrow BA, the burner 12 moves in the direction of arrow CD, Separate from each other. The burners 11 and 12 are ignited to heat the sealing portion of the valve 50 in the advancing position where they are close to each other, and the frame is squeezed and retracted in the retracted position where they are separated.

Further, FIG. 3 shows a pinch process. When the burners 11 and 12 are retracted, the heating process is completed and the pinch process is started. Is coming up. The pinchers 21 and 22 are composed of pinch blocks 21a and 21b and pinch blocks 22a and 22b, respectively. Until each pincher 21 and 22 reaches a predetermined position for pinching, the pinch block 21
Between a and 21b and between the pinch blocks 22a and 22b, they rise in an open state separated from each other, but when they reach a predetermined position, they are immediately closed by a mechanism (not shown) and each pipe end portion 51, Pinch 51 to crush and seal the tube ends 51, 51. Immediately after completion of the sealing, the pinch blocks 21a, 21b and 22a, 22b
Opens and descends.

Further, in the vicinity of the outer ends 54, 54 of the tube ends 51, 51 of the valve 50 held by the valve holder,
The heating condition compensating members 30, 30 are arranged respectively. The heating condition compensating members 30 and 30 are provided at both pipe end portions 5.
The heating condition compensating member 30 on the one end side is formed of a member formed in the shape of a round bar having the same outer diameter as that of Nos. 1 and 51.
And tube end portions 51, 51 and the other end side heating condition compensating member 30.
And are aligned on the same line at substantially the same pitch. That is, the distance d'between the heating condition compensating member 30 and the tube end portion 51 is the same as the distance d between the tube end portions 51, 51. With this arrangement, the inside 52 and the outside 54 of the tube end 51 are Means that the difference in heating conditions is compensated, and heating is performed under the same conditions.

Next, the operation of this embodiment will be described. First, the valve 50 is held by a valve holder (not shown),
The mount and its support body (not shown) allow the mount to be inserted into and supported by the tube end portion 51. Then, the burners 11 and 12 are switched to the heating frame and moved forward to simultaneously heat with a width including the tube end portion 51 and the heating condition compensating member 30. At the time of heating, since the heating condition compensating member 30 is arranged outside the outer portion 54, the contact degree of the burners 11 and 12 with respect to the inner portion 52 and the outer portion 54 is as follows.
Since they are almost the same and the mutual heat action of the facing portions is also the same, the inner portion 52 and the outer portion 54 are heated and heated uniformly, and the shrinkage of the inner portion 52 and the outer portion 54 is also uniform.

Thereupon, the burners 11 and 12 retreat, and then the pinchers 21 and 22 ascend, pinch the tube end 51, and descend. Since the degree of shrinkage of the pinched and sealed shape is almost uniform, the shape is always constant and good quality is obtained. The mechanism for driving the burner and the pincher is the same as a generally known one, and thus detailed description thereof is omitted, but an appropriate mechanism may be used. The material and shape of the heating condition compensating member are not limited to those in this embodiment, and may be appropriately selected as long as the object can be achieved. Furthermore, the number of tubes (valves, tube ends) is not limited to two, and they may be aligned.

[0020]

As described above in detail, according to the method of heating a tube of the present invention, the tube outside the outermost tube among the tubes arranged in the same manner as the interval between adjacent tubes. Since the heating condition compensating member is arranged and the heating condition compensating member and all the aligned tubes are heated, the difference in the heating condition between the outer part of the outermost tube and other heating parts is compensated. As a result, the heating states of all the heating parts of the aligned tube can be made uniform. As a result, the degree of shrinkage becomes uniform, and in the processing of the next step, it is possible to obtain a high quality product having a stable shape and distortion.

Further, in the tube heating apparatus of the present invention, since the heating condition compensating member is arranged at a predetermined interval for compensating the heating condition of the aligned tube, the aligned tube is placed between the heating condition compensating members. By inserting and positioning in, the heating condition of the alignment tube is immediately compensated. Therefore, the tube heating method of the present invention can be implemented with high efficiency.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view showing a heating process of an embodiment of the device of the present invention.

FIG. 2 is an explanatory view of a heating action similarly seen from the direction of arrow F in FIG.

FIG. 3 is a perspective explanatory view showing a pinch step in the same manner.

FIG. 4 is a perspective explanatory view showing a heating process of a conventional pinch seal device.

FIG. 5 is an explanatory view of a heating action as seen from the direction of arrow G in FIG.

[Explanation of symbols]

 d Equivalent distance 30 Heating condition compensating member 51 Aligned tube, outermost tube, tube end

Claims (2)

[Claims] 1. A heating method for heating an aligned tube in a direction orthogonal to the alignment direction, wherein the tube is positioned outside the outermost tube, and A heating method of a tube, wherein a heating condition compensating member is arranged at a distance equivalent to that of the adjacent tube, and the tube including the heating condition compensating member is heated. 2. A heating device for heating an aligned tube in a direction orthogonal to the alignment direction, wherein the tube heating device is located outside the outermost tube of the tubes. A heating device for a tube, wherein a heating condition compensating member is arranged at a distance equal to that of adjacent tubes.