JPS6232974Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used to improve the abrasion resistance and chemical resistance of paint films in linings and coatings, and to improve the durability of glass fiber reinforced plastics. The present invention relates to an apparatus for producing mixed glass flakes (scaly or powder), and in a broad sense, it relates to an apparatus for producing a glass film from which glass flakes are obtained.

More specifically, as illustrated in the conceptual diagram of FIG. A hollow thin film glass 6 formed by pumping gas through the trachea 5 is drawn into a film-like glass by a pair of pull rollers 7, 7, and is crushed to a required particle size as necessary to obtain glass flakes. The present invention relates to a glass film or flake manufacturing apparatus having the above structure.

The purpose of pumping gas (mainly air) into the flowing molten glass 3 from the hole 2 is to inflate the glass and thereby minimize the thickness of the hollow thin film glass 6 to, for example, about 2 to 6 microns. It's for a reason.

The pull rollers 7, 7 receive the extremely thinned glass 6, adhere it to the peripheral surface and solidify it to form a film, if necessary.
Crush into scales or powder of desired particle size.

In the glass film or flake manufacturing apparatus configured as described above, if foreign objects or bubbles are mixed in the molten glass or if the glass temperature fluctuates abnormally, the hollow thin film glass may break. It is necessary to detect glass cracks because glass cracks require the production of glass films or flakes to be stopped. Conventionally,
This detection was often performed visually.

In addition, US
There is P.3222151. This is shown in Figure 2 A to C and outlined below.

20 is an apron connected to the glass melting tank, from which a hollow thin film glass 21 flows down. A micro switch 23 is provided with a sensor bar 22 on both sides thereof. The thin film glass 21 is
When it is normal, it is pulled by the lower pull rollers 24, 24 and has a smaller diameter than the apron 20. At this time, the thin film glass 21 is separated from the sensor bar 22 (see FIG. 2 A and B).

When the thin film glass 21 breaks, the pull roller 24,
24 is removed, and the diameter of the falling glass 21' becomes almost the same as that of the apron 20, as shown in FIG. 2C. The bottom edge of the glass touches the sensor bar 22, and its movement turns on the microswitch 23. In other words, cracks in hollow thin film glass are automatically detected.

This conventional device has the following problems regarding glass breakage detection.

(b) Breaks cannot be detected unless the sensor bar comes into direct contact with the falling glass after breaking. Moreover, it must not be possible for glass to adhere to and grow on the sensor bar. In other words, the sensor bar must have extremely high positional accuracy and sensing accuracy, which is difficult to obtain. Further, special means must be provided to operate the cylinder and retract the sensor bar together with the microswitch based on the detection of a crack.

(b) The sensor bar and microswitch are located in close proximity to thin film glass that radiates heat and are susceptible to thermal deterioration. In other words, there are problems in terms of lifespan and detection accuracy.

The purpose of the present invention is to solve such problems.

Measures taken by this invention for this purpose (Summary structure)
Assuming the configuration described in [], the following []
It is as follows.

[] An air pipe 5 whose lower end outlet 4 faces the tank bottom hole 2 of the glass melting tank 1 and a blower 30 as a pressure source.
A detector 33 (e.g., a manometer, a flowmeter, a current meter, etc.) are interposed.

According to this configuration [], there are the following functions and effects.

(A) There is a big change in the state of the blown gas in the piping system between before and after the hollow thin film glass is broken. Since this large change is detected, reliable detection is possible without using a highly accurate detector.

(B) When interposing the detector in the piping system, there is a high degree of freedom in the arrangement, and the arrangement is much easier than in the conventional devices described above, which require high precision in the position of the microswitch.

(C) Since the detector is separated from the radiant heat radiation area of the thin film glass, it is not affected by the heat, and in this sense, the detection accuracy of glass cracks is high and the lifespan can be maintained for a long time.

Hereinafter, an embodiment of the present invention will be described based on FIG.

1 is a glass melting tank, 2 is a hole in the bottom of the tank, 3 is molten glass, 4 is a lower end outlet of an air pipe 5, 6 is a hollow thin film glass, 7, 7 is a pull roller, 8 is a glass flake, 30 is a blower . Reference numeral 31 represents a piping system connecting the blower 30 and the air pipe 5, and a system 34 is branched off from the downstream side of an intervening solenoid valve 32 to a manometer 33'.

The manometer 33' is an example of a detector 33 for detecting changes in the state of the blown gas in the summary structure, and the manometer 33'
5 is embedded in the upper end of the float 36. During normal operation without glass breakage, the force for pushing up the float 36 due to air pressure is greater than the weight of the float 36, the float 36 is held at its upper limit, and the conductor 35 turns on the contact 37. When the contact 37 is on, the solenoid valve 32 is opened;
The valve is configured to be closed when it is turned off.

That is, when glass cracking occurs, the resistance to the discharge flow from the air pipe 5 decreases rapidly, and the system 31, 34
pressure drops. As a result, the float 36 descends and the conductor 35 separates from the contact 37, turning it off, thereby closing the electromagnetic valve 32. That is, when the glass breaks, the outflow of gas from the air pipe 5 is automatically stopped.

Even if the gas outflow is stopped, the molten glass continues to flow down in a rod shape. If this falling glass adheres to the pull rollers 7, 7, post-processing becomes difficult.

As a countermeasure against this, the pull rollers 7, 7 are moved to the trolley 38.
A pneumatic or hydraulic cylinder 39 connected to the trolley 38 is activated when the contact 37 is turned off due to glass breakage, and the pull roller 7,
7 is retracted out of the molten glass flowing area.

What should be controlled by the detector 33, ie, the manometer 33', may be the activation of an alarm such as a bell or buzzer, the stopping of the pull roller drive motor or the blower, or any other suitable selection.

Note that the pull rollers 7, 7 may be made of film-like glass instead of glass flakes, and in that case, they are crushed in a subsequent process.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the structure, and FIGS. 2A to 2C are a front view, a side view, and an enlarged front view of a conventional example. FIG. 3 is a schematic diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Glass melting tank, 2... Tank bottom hole, 4... Lower end discharge port, 5... Air pipe, 6... Hollow thin film glass, 7... Pull roller, 30... Air blower, 31...
...Piping system, 33...Detector, 33'...Manometer.

Claims (1)

[Scope of Claim for Utility Model Registration] Formed by forcing gas into the molten glass flowing down from the tank bottom hole 2 of the glass melting tank 1 from the air pipe 5 whose lower end discharge port 4 faces the tank bottom hole 2. It is a device configured to pull in a hollow thin film glass 6 by a pair of pull rollers 7, 7, and a piping system 3 connecting the air pipe 5 and the blower 30.
1. A glass film or flake manufacturing apparatus in which a detector 33 for detecting a change in the state of the blown gas due to the cracking of the hollow thin film glass 6 is interposed. The glass film or flake manufacturing apparatus according to claim 1, wherein the detector 33 is a manometer 33'.