JPS59156922A - Continuous manufacturing apparatus of rod-shape glass - Google Patents

Abstract

PURPOSE:To manufacture continuously the titled glass free from flaws, foreign matter and bends by drawing out molten glass in rod shape from a crucible through a tension roll, and cutting the solidified part with a heat cutter. CONSTITUTION:Molten glass in a crucible 2 is drawn up in rod shape by driving rollers 10 and 11. When the tip hits a limit switch 17, a lift 42 is lifted up, and an electric current is supplied to a heat cutter provided to the lift 42 to heat the cutter at a temp. higher than the softening point of glass. Then the heated cutter is pushed against the solidified part of a glass 6, and the glass is cut. Thereafter, the lift 42 is lifted down to be on stand-by. The cut glass rod 6 is lifted up in a frame body 20. When the rod hits a limit switch 18, the frame body 20 is moved toward a receiving body 23 by the action of a cylinder 21, and the rod is transferred to the receiving body. The rod-shaped glass of high quality, free from flaws on the surface of the product, foreign matter therein, and bends etc., is manufactured continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously manufacturing rod-shaped glass that is used as a raw material for rod lenses and the like.

Conventionally, in manufacturing rod-shaped glass, molten glass in a crucible is pulled into a rod shape, and the solidified portion of the pulled rod-shaped glass is cut with a diamond grindstone to cut the product into a predetermined length. I'm trying to get it.

In the case of such a conventional manufacturing method, a cutting impact force is generated during cutting, and this impact force acts as an external force on the so-called forming brush part at the boundary between the rod-shaped glass and the molten glass base.
A bend occurs in the rod-shaped glass. In addition, dust generated during cutting may adhere to the rolls that pull up the rod-shaped glass or fall into the crucible, resulting in scratches on the surface of the rod-shaped glass or foreign matter entering the rod-shaped glass. A problem has arisen.

The present invention has been made to improve the above-mentioned conventional problems, and when manufacturing rod-shaped glass, the surface of the product is free from flaws, and it is possible to effectively prevent foreign matter from entering the product. The object of the present invention is to provide an entire apparatus for continuously manufacturing high quality rod-shaped glass without curves, etc.

In order to achieve the above object, an apparatus for continuous production of rod-shaped glass according to the present invention is provided with a crucible for storing molten glass in the apparatus main body, and pulls the molten glass upward or downward from inside the crucible in the form of a rod using tension rolls. The gist is that a heat cutter is provided on the elevating body that rises or descends in sync with the rod-shaped glass, and the cutter melts and cuts the solidified portion of the rod-shaped glass.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a front view of a manufacturing apparatus according to the present invention, and Fig. 2 is a side view of the same apparatus. In the lower part of a vertically long frame-shaped body 1, molten glass that has been refined is maintained and stored at a forming temperature. Crucible 2
are installed, and three support stays 3.4.5 are horizontally installed on the main body 1, spaced apart in the vertical direction. and,
At the center of the lower support stay 3, a pair of □ guide rollers 7.8 for guiding the crucible 2 and the upper digit rod-shaped glass 6fa are vertically disposed. These guide rollers 7°8 both form shallow V-shaped or U-shaped grooves in the circumferential direction,
In order to uniformly contact the rod-shaped glass 6, one of the guide rollers 7 is fixed and the other guide roller 8 is swingable. is pressed against the hydraulic rough.

Further, a pair of drive rollers 1 are provided at the center of the intermediate support stay 4 to pull up the molten glass from the crucible 2 in a rod shape.
0,11'Y vertically installed. These drive rollers 10,1
1 has a rod-like lath 6 similar to the guide roller 7.8.
Grooves are formed on the circumferential surface of the rollers 10 and 11 to bring them into close contact with each other.
so that it can be rotated by One drive roller 10 is fixed, and the other drive roller 11
is pressed against one drive row 10 by a weight 14.

Furthermore, a detection sensor 15 consisting of a light emitting element and a light receiving element is attached to the upper support stay 5, and limit switches 17, 18'2 are mounted on a support plate 16 erected in the center of the support stay 5, spaced apart in the vertical direction. It is set up. In addition, a pair of left and right wire diameter measuring devices 19 are installed in the main body 1 near the upper end of the crucible 2.
The diameter of the rod 6 measured by the wire diameter measuring device 19 is fed back to the synchronous motor 12.
, 13, so that the diameter of the rod-like lath 6 is always kept constant.

On the other hand, the base of a frame 20 is pivotally attached to the upper part of the main body 1, and as shown in FIG. However, the frame body 20 is caused to swing to an angle along the receiving portion 23 by the operation of the cylinder 21.

Lateral support stays 24 and 25 are installed on the frame 20 at its upper and intermediate parts, and guide rollers 26 and 27 similar to those described above are installed vertically at the center of the intermediate support stay 25, and one roller 26 is fixed, a weight 28 is attached to the other roller 27, and a pair of tension rollers 29 and 30 are suspended in the center of the upper support stay 24, and each roller 29 and 30 is driven by a torque motor 31 and 32. I'm trying to make it rotate. Further, one tension roller 29 is fixed to the frame 20, and the other tension roller 30 is fixed to the frame 20.
0, and is biased by a weight 33 to one tension roller 29 times.

In addition, a pair of idle rollers 34 and 35 are vertically installed in a portion of the support stay 3 that is closer to the left side in FIG. It is biased in the direction of the guide roller 34. Similarly, a pair of drive rollers 37 and 38v are vertically disposed on the left side of the intermediate support stay 4, and these drive rollers 37 and 38 are rotated by motors 39 and 40, and one of the drive rollers 37 is fixed, The other drive roller 38 is biased by a weight 41 in the direction of one drive roller 37 times. The elevating body 42, which has serrations formed on its surface to prevent slipping, is held between the guide rollers 34, 35 and the driving rollers 37 and 38, and by rotating the driving rollers 37 and 38, the elevating body 42 is moved upwardly or downwardly. I'm trying to move it to

As shown in FIGS. 3 and 4, a motor 44 is fixed on the support plate 43 at the upper part of the elevating body 42, and a plate 45 is attached to the drive shaft of the motor 44. 45 in the horizontal direction.

The base of this plate body 45 is made into a bifurcated portion, and a protrusion 46 provided at the upper end of the elevating body 42 is exposed between the bifurcated portions, and a stopper 47 attached to one of the bifurcated portions comes into contact with the protrusion 46. Thus, the entire rotation angle of the plate body 45 is regulated. Furthermore, a heat cutter 48 made of a linear or rod-shaped heating element for cutting the rod-shaped glass 6 by melting is provided at the tip of the plate 45.

Next, the operation of the manufacturing apparatus configured as described above will be explained below.

First, to start the work, a rod-shaped seed glass having the same coefficient of thermal expansion as the molten glass is placed on the driving roller 10.1.
1 and between guide rollers 7.8 and the lower end of the seed glass is placed on the molten glass base surface in the crucible 2. After the molten glass is welded to the lower end of the seed glass, the synchronous motor 1-2.13
'r drive. Then, the molten glass in the crucible 2 sticks to the seed glass and the rod shape is pulled up as the lath 6.
It ascends while being guided by the guide rolls 7.8, which are made of silicone rubber baked and polished on a stainless steel core.

Next, the operation after the seed glass is removed from the device will be explained.

That is, the rod-shaped glass 6 that has passed between the drive rollers 10 and 11 is guided between the guide rods 26 and 27 of the frame 20, passes between the tension rollers 29 and 30 above them, and is placed on the support stay 5. The tip is detected by the sensor 15. Then, voltage is applied to the torque motors 31 and 32 that rotate the tension rollers 29 and 30W, and the rod-shaped glass 6 is pulled up by the drive rollers 10 and 11. A smaller tension is applied to the lath 6, and the rod-shaped glass is pulled up by the drive rollers 10 and 11. roller 29
30 is in close contact with the rod-shaped glass 6 to maintain a stationary state.

After that, the rod-shaped lath 6 rises, and when its tip hits the limit switch 17, the synchronous motors 39 and 40 are started, and the elevating body 42 rises at a speed slightly faster than the rising speed of the rod-shaped lath 6. do.

At the same time as the elevating body 42 rises, the heat cutter 48 is energized so that the temperature of the cutter 4 exceeds the softening point of the glass.
82 is heated, and the plate 45 is rotated by the motor 44. Due to this rotation, the cutter 48 is pressed against the solidified portion of the rod-shaped glass 6, and the rod-shaped glass is melted and cut without applying an external force 2 to the lath 6. Further, the fused rod-shaped glass 6 rises at a speed slightly faster than the rising speed of the elevating body 42. In this way, the rising speed of the elevating body 42 is faster than the speed of the rod-shaped glass raised by the drive rollers 10, 11 (and the tension rollers 29, 30).
Since the speed of the rod-shaped glass being raised is also slow, the cutter 48 does not touch the rod-shaped glass when it rotates to its original position after cutting the rod-shaped lath 6 by melting.

After this, the elevating body 42 descends and enters a standby state, and the fused rod-shaped glass 6 rises in the frame 20,
Its tip touches the upper limit switch 18. Then, the frame body 20 is tilted toward the receiving portion 23 by the operation of the cylinder 21, and when the frame body 20 becomes approximately parallel to the receiving portion 23, the guide plates 49, 49 provided on the receiving portion 23 move against the tension roller 29. 3
0 and between the guide rollers 26.2'7, widening the distance between the rollers, and transferring the fused rod-shaped glass 6 to the receiving portion 23.

During this time, the rod-shaped glass 6 to be cut next
is rising, and as before, this rod-shaped glass 6 is guided by the guide rollers 26 and 27 of the frame 20 which has returned to its original position, passes between the tension rollers 29 and 30, and its tip reaches the sensor 15. .

After this, the same operation as described above is repeated.

Figure @5 shows another embodiment. In this embodiment, a guide roller 27 is swingably attached to the frame 20.
The weight 2 is not provided on the tension roller 30, but instead the roller 27, 302, and the roller 26 fixed by the cylinder 50, 51 are pressed in the 29 direction, and the rod-shaped glass 6 is removed from between the rollers. causes the cylinders 50, 51 to perform a retracting motion.

Therefore, in this example, as in the previous example (,
There is no need to provide a guide plate on the receiving part to increase the distance between the rollers.

In this embodiment as well, the molten glass in the crucible 2 passes through the guide rollers 7.8 to the drive roller 1.
The rod-shaped glass 6 that has been pulled up passes between the guide rollers 26 and 27 of the frame 20 and the tension rolls 29 and 30 and further rises, and as it does so, the heat cutter 48 The elevating body 42 equipped with the rod-shaped glass 6 also rises a little faster than the rod-shaped glass 6, and the heat cutter 48 melts and cuts the solidified portion of the rod-shaped glass 6. Then, the fused rod-shaped glass 6 of a predetermined length is tilted while being held by the rollers 26, 27, 29, 30 of the frame 2o, and the cylinder 5 is held by the rollers.
Release with a retraction movement of 0.51 and move the rod-shaped glass to the receiving part.

In the illustrated example, the crucible 2 is placed at the bottom of the main body 1, but the crucible is placed at the top of the main body 1, and the molten glass is inserted into the rod through the opening formed at the bottom of the crucible. Alternatively, the rod-shaped glass may be pulled out downward, and the pulled-out rod-shaped glass may be melted and cut by a heat cutter that descends in synchronization with the rod-shaped glass.

As explained above, according to the present invention, the melting roller held in the crucible pulls out the melting glass upwardly or downwardly in the shape of a rod, and the solidified portion of the pulled out rod-shaped glass is drawn out in sync with the rod-shaped glass. Since the glass rods can be cut by a heat cutter attached to an elevating body that moves up or down, the rod-shaped glass can be cut without applying any external force, and therefore the rod-shaped glass will not be bent and a product with good molding precision can be produced. I can get nothing. In addition, there is no dust generation due to fusing, so there is no disadvantage of dust adhering to the roller surface and causing defects on the product, and there is no dust falling into the crucible, resulting in high purity with no foreign matter contamination. products can be obtained.

In particular, as described in the example, if the crucible is installed at the top of the main body and the rod-shaped glass is pulled out from the bottom of the crucible downwards, dirt etc. from various devices installed in the main body will enter the crucible. The fear disappears.

Further, according to the present invention, when the rod-shaped glass is lath-cut, the rod-shaped glass is always pulled out at a speed within a certain range without stopping the movement of the rod-shaped glass, so that the rod-shaped glass has a uniform diameter. It has many effects such as being able to manufacture glass efficiently.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a front view of a continuous manufacturing apparatus for rod-shaped glass according to the present invention;
FIG. 2 is a side view of the same apparatus, FIG. 3 is a plan view of a mechanism for melt-cutting rod-shaped glass, FIG. 4 is a front view of the same mechanism, and FIG. 5 is a front view of another embodiment. In the drawings, 1 is an apparatus main body, 2 is a crucible, 6 is a rod-shaped glass, 10.1) is a drive roller, 20 is a frame, 42 is an elevating body, and 48 is a cutter. Figure 1 Figure 2 R Figure 4

Claims (1)

[Claims] A crucible disposed in the main body of the apparatus, a drive roller that pulls out the molten glass in the crucible in the form of a rod, an elevating body that rises or descends in synchronization with the rod-shaped glass drawn out by the drive roller, and the rod. and a cutter provided on the elevating body to melt and cut the solidified portion of the rod-shaped glass.