JPS59203733A - Apparatus for producing partly linear glass coil tube - Google Patents

Abstract

PURPOSE:To obtain the titled apparatus capable of providing uniform products easily by constituting the apparatus with a combination of a turntable for lifting a material by a specified pitch using a rotating mechanism, a drum attached slidably in its diametral direction, and a burner. CONSTITUTION:A glass tube 1 held by inserting freely movably through a supporting member 2 is fixed to a drum main body 6 with a fixing member 4 by manipulating a pin 7a. Then, the glass tube 1 is softened and drawn out by heating with a burner 8 (9 in the drawing is a flame throwing part). The shaft 16 is then turned to rotate the drum main body 6 by 180 deg. together with a turntable 15 and the tube 1 is pulled out simultaneously while its softened part is wound around a curved surface part 5a of the drum main body 6. (In this stage, the turntable 15 is moved downward by an external thread of the shaft 16 and an internal thread of the bed 17, so that the bent glass tube 1 is transformed to a spiral shape.) The drum main body 6 is then moved rightward along a guide groove in the turntable 15, and the same procedures as described above are repeated to form a multiply wound glass coil tube having linear parts.

Description

[Detailed description of the invention] Regarding location.

Glass corrugated tubes with straight sections are used, for example, in columns for gas chromatographs, but unlike glass spiral tubes, only the bent sections must be heated and softened, so they are susceptible to the effects of heat and bending in the straight sections. Care must be taken to ensure the uniformity of heating of the parts, especially the heating after being wrapped several times, and for this reason, it can only be manufactured by hand, relying on the skills and tricks of skilled craftsmen.

However, with such a handwork manufacturing method that can only be performed by skilled workers, there is a limit to the number of pieces produced, and an increase in costs due to labor costs is unavoidable, and quality also varies due to individual differences among the makers.

The inventors of the present invention have conducted extensive research to mechanically manufacture glass corrugated tubes having such straight sections, and have found that glass tube supports and glass tube wrappings having an outer shape corresponding to the circular shape of the target glass corrugated tubes have been developed. When using a basic fishing device consisting of a drum, a burner, and a drum rotation mechanism, the problem of slanting can be solved and the present invention has been completed.

In the present invention, the drum for winding the glass tube has an outer shape corresponding to the circular shape of the target glass tube, and its two curved portions (corresponding to the bent portions of the glass tube) are shaped like the drum. It is configured to be slidable in the horizontal direction.

By making the curved portion of the drum slidable, when heating the glass tube supplied from the glass tube support with a burner, the curved portion can be slid inside the drum to fully bend the portion of the glass tube that is to be bent. This makes it possible to heat evenly. After heating, the curved portion is slid and fixed at a position corresponding to the circular shape of the intended bent portion of the glass flexible tube, and the drum is rotated by a drum rotation mechanism to give the desired bent portion to the glass flexible tube.

Since the glass corrugated tube is wound several times, the drum rotation mechanism is configured to raise or lower the drum at a predetermined pitch as the drum rotates.

The burner is placed between the glass tube support and the glass tube winding drum, and is designed to uniformly heat the entire portion of the supplied glass tube that corresponds to the intended bend in the glass tube. It has a flame injection part with a length corresponding to the length of the bent part of the glass corrugated tube.

The heating time of the glass tube, that is, the burner ignition time, varies depending on the diameter, wall thickness, and material of the glass tube, but once you set the burner ignition time to an appropriate heating time for each glass tube, it will be automatically activated from then on. The glass tube is always heated in an appropriate manner. It is preferable to adjust the length and strength of the burner flame so that the glass tube is enveloped in flame.

Next, embodiments of the apparatus of the present invention will be described based on the drawings, but the present invention is not limited to these embodiments.

Fig. 1 is a side view of one embodiment of the apparatus of the present invention, Fig. 2 is a plan view of the embodiment shown in Fig. 1, and Fig. 3 is a main view showing the manufacturing situation of a glass corrugated pipe using the apparatus of the present invention. FIG.

(1) is a glass tube, which is supported horizontally by a glass tube support (2). The tip of this glass tube (glass tube) is wrapped around the drum (3) using the fixture (4) of the drum (3).
(This is fixed. The glass tube winding drum (3) is composed of three parts, namely two curved parts (5a), (5b) and the drum body (6).
A (5) is slidably secured to the main body (6) in the longitudinal direction ((A) direction in Figure 2), and is secured with set screws (7, (7b)). Each is fixed at a desired position.

(8) is a burner, which uniformly heats the entire portion of the glass tube (1) to be bent at the same time. Therefore, the length of the flame injection part (9) of the burner (8) along the glass tube (1) corresponds to the length of the bent part of the glass corrugated tube (+01 (Fig. 3)) to be manufactured. Fuel gas is supplied to the burner (8) from a pipe (11), the amount of which is controlled by a valve (121).An output from a control box (31) is also sent to control the ignition time.

For glass tube winding, the drum (3) is connected to a drum rotation mechanism (14).The drum rotation mechanism (14 is composed of a turntable (151) and a threaded rotating shaft (161); (16) is screwed together with the pedestal (171).

The drum (3) is placed on the turntable (15+) on the rail (+
It is fixed to a table (191) that can slide along 81 (in the direction (B) in FIG. 2), and is placed at an eccentric position with respect to the rotation axis during heating (FIGS. 1 and 2).

With this configuration, the drum (3) can be rotated in the (0) direction in FIG. 2 while the curved surface (5) of the drum (3) is always positioned on the extension line of the glass tube. The drum (3) can be lowered by the action of the threaded rotating shaft 161, and the glass tube (1
It is possible to form a bend in the glass corrugated tube flO) without exerting a lateral force on the glass tube flO). After half a rotation, the drum (
3) Press and slide it back to its original position to perform the next heating.

The drum rotation mechanism is not limited to the one shown in FIGS. 1 and 2, but rotates the drum while always positioning the curved part of the drum on the extension line of the glass tube, and also lowers or raises the drum at a predetermined pitch. It can be of any structure as long as it is.

Further, the drum rotation tA may be driven not manually but by using a stepping motor, a servo motor, or the like.

Next, the manufacturing process of a glass corrugated tube using the apparatus of the present invention will be explained.

A straight glass tube (1) is placed on the glass tube support (2), and with the roller (20) lightly pressing the glass tube (1), the tip of the glass tube (1) is placed on the drum (3). Identification to the fixture (4).

At this time, the curved part of the drum (3) on the burner (8) side (
5 at the position where it contacts the drum body (6) (3rd
figure). Therefore, the flame of the burner (8) can uniformly heat the glass tube without being hindered by the curved surface of the drum.

The burner (8) is then ignited by pressing the ignition switch (not shown) in the control box (13).The ignition time is controlled by a time switch (not shown) in the control box (131), and the burner is It automatically extinguishes the fire.When the flame of the burner is made strong enough to envelop the glass tube as described above, it can be heated evenly by the bran on the back of the glass tube.

The ignition time of the burner varies depending on the diameter, wall thickness, material, flame strength, flame temperature, etc. of the glass tube as described above, but is usually 5 to 50 seconds, preferably 10 to 28 seconds.

When the burner (81) is extinguished, pull out the curved part (5) to the position corresponding to the circular shape of the glass tube (Figures 1 and 2) and fix it with the screw (7). Immediately after fixing, rotate the drum (3). A bent portion of the glass tube is formed.As described above, this drum can be rotated extremely smoothly, and a bent portion without deformation is formed in the inner and outer diameters of the glass tube.

At this time, the glass tube (1) has a moderate resistance than the roller.
given to.

By the rotation of the drum (that is, the rotation of the turntable 05), the drum is lowered by the pitch of the rotating shaft (11il), giving the glass tube a spiral shape.Is the pitch of the screw the same as the thickness of the glass tube? Or slightly larger is fine.

In this way, a bent portion of the glass corrugated tube is formed, and by repeating the above operations, a glass corrugated tube having a straight portion wound multiple times is manufactured.

In the present invention, there is no need for the operation of blowing air into the glass tube, which is normally performed in glass work, and even without such an operation, a uniform bent portion with no deformation in the inner and outer diameters of the glass tube can be formed.

When winding the glass tube in two or more layers, if the flame from the burner (8) is applied only from the lateral direction, the already formed bent portion may get in the way, and the portion of the glass tube to be heated may not be heated evenly. At that time, use the auxiliary burner c! located above the bend. 1) can be used to heat the parts that cannot be sufficiently heated by the burner (8). The auxiliary burner c2n+c is supplied with fuel gas from the pipe (11) through a valve (support), and is ignited by an ignition switch (not shown) in the control box (13).

Glass corrugated tubes having a straight section that can be produced by the apparatus of the present invention include columns for gas chromatographs as well as corrugated tubes for condensers, and the total length is not particularly limited or is suitably about 30 cm to 10 m. The diameter of the glass tube is not particularly controlled, or it is usually suitable to have an outer diameter of about 1 to 15 mm. The material of the glass tube may be either hard or soft.

Further, the ignition timing and the ignition time of the burner and the auxiliary burner may be linked to the operation of the drum rotation mechanism, and these operations may be controlled using a microcomputer.

When the apparatus of the present invention is used, a glass corrugated tube having a straight section can be manufactured easily and in a short time even without a skilled worker, and the product obtained is also homogeneous.

Next, an example of manufacturing a glass corrugated pipe having a straight portion using the apparatus of the present invention will be shown.

Manufactured using Pyrex (heat-resistant glass code A7740 manufactured by Corning Glass Works) with a diameter of 6 mm, an inner diameter of 3 mm, and a length of 1.5 m, with a major axis of 155 mm and a width of 45 mm.
A quadruple-wound glass corrugated tube was manufactured using the apparatus of the present invention shown in FIGS. 1 to 3.

The appropriate ignition time for the burner (8) is approximately 28 seconds.
The auxiliary burner (21) was ignited for about 4 seconds after the type 2 mouth.

The obtained glass corrugated tube exhibited excellent strength, with no deformation in the inner and outer diameters of the bent portions, and no abnormality was observed at the boundary between the bent portions.

In addition, when using a Pyrex glass tube with an outer diameter of 5 mm and an inner diameter of 3 mm, the ignition time for one burner is approximately 15 seconds.
The ignition time for one auxiliary burner is approximately 2 seconds, and the outer diameter is 5 mm.
When using Pyrex with an inner diameter of 3 or 4 mm, the ignition time for one burner was about 11 seconds, and the ignition time for one auxiliary burner was about 1 second.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of one embodiment of the device of the present invention, Fig. 2 is a schematic plan view of the embodiment shown in Fig. 1, and Fig. 3 is a schematic perspective view of the main parts of the weir in the device of the present invention. It is. (Brief explanation of the drawings) (1) Niglass tube (2) Niglass tube support (3); Drum wrapping is on drums (5a), (5b): Curved portion (8): Burner (9): Flame injection part 0 [Nigarasu snake pipe (141! Drum rotation mechanism 051 = turntable + 1611 rotation axis (21+ = auxiliary burner

Claims (1)

[Claims] 1. The glass tube support and the glass tube winding device, which has an outer shape corresponding to the circular shape of the desired glass flexible tube with a straight section, consist of a drum, a burner, and a drum rotating machine. The curved surface part is slidable in the longitudinal direction of the drum, and the length corresponds to the length along the glass tube of the flame injection part of the burner or the length of the bent part of the glass tube, and the drum rotation mechanism rotates the drum and holds the drum in a specified position. A manufacturing device for a glass corrugated tube having a straight section configured to be raised and lowered at a pitch of .