JPH03270738A - Apparatus for cooling and grinding molten glass - Google Patents

Abstract

PURPOSE:To shorten a process and to lower a contamination risk by providing a pair of cooling rolls pressing and cooling molten glass and arranging a pair of grinding rolls under the cooling rolls in opposed relationship. CONSTITUTION:The molten glass MG from a melting furnace is continuously injected in the casting part C between a pair of cooling rolls 1, 1' and pressed while quenched by the cooling rolls 1, 1' to become thin flat glass SG. This flat glass SG is successively fed downwardly and pressed by a pair of rotated grinding rolls 2, 2' to be ground into fine glass particles PG which are, in turn, further classified into a predetermined particle size by a vibration classifier 4. By this method, the deterioration of the characteristics of glass particles can be prevented and the enhancement of productivity and the stabilization of quality can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for cooling and crushing molten glass, and more particularly to an apparatus for continuously producing glass particles from molten glass.

[Conventional technology]

Fine glass particles used in the glass lining of chemical industry reaction vessels and the like require strict management in their manufacture and storage to prevent their properties from deteriorating due to contamination by foreign foreign substances.

Conventionally, in the production of such glass particles, for example, plate-shaped or lump-shaped glass obtained by a casting method in which molten glass is poured down onto a metal plate, cooled and solidified, is made into a certain size by applying an external force. After crushing the assimilated glass, it is further crushed using a ball mill etc. to obtain glass particles of a predetermined particle size. Alternatively, the molten glass is flowed down into water, rapidly cooled and solidified, and an external force is applied to the assimilated glass. The so-called water pulverization method was used to obtain fine glass particles with a predetermined particle size by crushing the glass into pieces the size of a piece of music, removing moisture using a dryer or the like, and then crushing the glass using a ball mill or the like.

[Problem to be solved by the invention]

However, in the method for manufacturing glass particles according to the above-mentioned casting method, the steps of melting, casting, solidification, coarse crushing, crushing, and classification are performed, whereas in the water pulverization method, the steps of melting, granulation, drying, pulverization, classification, etc. are carried out, respectively. Because it involves a combination of processes and has a large number of processes, it is not economical and difficult to increase productivity, and the risk of contamination of glass particles with foreign foreign substances during the manufacturing process increases, especially when using water. The water granulation method, which involves a drying process, is susceptible to contamination and requires strict and complicated management to prevent contamination.
There is a problem in that this further becomes a source of light pollution for improving productivity.

In view of the above-mentioned problems of the prior art, the present invention enables the continuous production of fine glass particles from molten glass, reduces the number of steps, and reduces the risk of contamination due to the reduction in the number of steps. The object of the present invention is to provide a cooling and crushing apparatus for molten glass that can improve productivity and stabilize quality.

[Means to solve the problem]

In order to achieve the above object, the present invention incorporates the following features.

That is, the molten glass cooling and crushing apparatus according to the present invention is as follows:
A pair of cooling rolls are placed opposite each other in the horizontal direction, and pressurize and cool the molten glass flowing down and injected between them to solidify it into a thin plate. It is equipped with a pair of crushing rolls that pressurize and crush the thin plate-like assimilated glass sent out from the crushing roll.

In addition, the pair of cooling rolls is equipped with a pressure sensor that measures the surface pressure applied to the molten glass, and a pressure adjustment mechanism that constantly keeps the surface pressure applied to the molten glass constant based on the measured value of the pressure sensor. It may be assumed that the

Further, each of the pair of grinding rolls may have irregularities on its pressure roll surface that engage with each other.

Further, the pair of grinding rolls may both be formed as smooth rolls, and may be rotated at mutually different circumferential speeds.

[Effect]

The molten glass cooling and crushing apparatus according to the present invention includes a pair of cooling rolls arranged horizontally opposite each other.
The molten glass flowing down and injected is received between the pair of cooling rolls, and the molten glass is pressurized and cooled to solidify into a thin plate shape, and the molten glass can be sequentially sent downward. Furthermore, since a pair of crushing rolls is provided below the wire pair of cooling rolls, the thin plate-like assimilated glass sent out from the pair of cooling rolls is continuously crushed by the wire pair of crushing rolls into glass particles. can do. In particular, when molten glass is pressed into a thin plate shape by a pair of cooling rolls, the pressurized molten glass is rapidly cooled and solidified by contact with the cooling rolls and heat exchange. Glass has a high internal strain due to pressurization and rapid cooling,
- When an external stress greater than that of a window is applied, it will form countless fine particles, just like tempered glass. Can be ground into particles.

In addition, a pressure sensor that measures the surface pressure applied to the molten glass and a pressing force adjustment mechanism that adjusts the surface pressure based on the measurement 41f of the pressure sensor are installed on the pair of cooling rolls. By keeping constant and controlling the thickness of the thin plate-shaped assimilated glass sent out from the wire pair of cooling rolls to a constant value, the grinding by the lower pair of grinding rolls can be performed stably and with high reproducibility.

In addition, the roll surfaces of the pair of crushing rolls are provided with concavities and convexities that engage with each other, and by applying pressures with different phases from both sides of the thin plate-like assimilated glass, shear stress is applied to the thin plate-like assimilated glass to be pressurized, and the pulverization is carried out. It can be made reliable and efficient.

In addition, by rotating a pair of crushing rolls, which are used as smooth rolls, at different circumferential speeds and varying the speed on both sides of the assimilated glass plate, shear stress is applied to the thin plate-shaped assimilated glass to be pressurized. Therefore, the pulverization can be performed reliably and efficiently.

〔Example〕

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

FIG. 1 is a conceptual explanatory diagram showing the configuration of the molten glass cooling and crushing apparatus of this embodiment.

In FIG. 1, (D(1') is a cooling roll,
These cooling rolls (1) (1") are located at the top of the device, and are arranged in pairs to face each other in the horizontal direction. The pressure rolls are made of a metal material with excellent thermal conductivity, such as copper, for example. The cooling roll (1) (1') is formed into a cylindrical shape, and is configured to introduce and circulate cooling water into the interior through both shaft parts having a center hole. In this case, pressure sensors such as load cells placed at both ends of the roll shaft (not shown) are installed inside, and the pressure of the cooling water incorporated inside can be adjusted arbitrarily, and the surface pressure applied to the roll surface can be adjusted. It is said that it is possible to detect the surface pressure and to adjust the back pressure that opposes the surface pressure.

(2) (2') are crushing rolls, and these crushing rolls (202°) are smooth rolls made of, for example, hard alloy steel subjected to surface hardening treatment, and are paired with cooling rolls (I
They are arranged in pairs and in parallel below and spaced apart from each other by a predetermined distance from HI'.

(3) (3') are scrapers, and these scrapers (3H3") use their scraping blades as crushing rolls (2) (2").
) in contact with the lower surface of the rolls (2).
(2') are arranged opposite to each other directly below.

(4) is a vibration classifier, and the vibration classifier @ (4) is
It has multiple stages of sieves with different meshes, and is placed below the pair of crushing rolls (2) (2°).

Although not shown here, the entire outer shell of the cooling pulverizer of this embodiment is covered with a case except for the injection port at the top and the particle outlet of the vibration classifier (4).

In the cooling crushing apparatus of this embodiment having the above-mentioned configuration, the casting machine consists of a V-shaped space formed between a pair of cooling rolls (IDI') rotated in the direction of the solid arrow in FIG. Molten glass MG from melting furnace F is continuously injected into section C at a predetermined flow rate. The molten glass MG in contact with the roll surfaces of the rotating pair of cooling rolls (1) (1') is heated at a temperature of 1°.
Through heat exchange with the glass, it is rapidly cooled and pressurized, and as the glass rotates, it is turned into thin glass SG, which is sent downward one after another, and then rotated downward in the direction of the dotted arrow. Pressurized by the crushing roll (2) (2°),
The glass particles are crushed into fine glass particles PG and subjected to downward vibrational classification i (
4], the particles are classified into particle sizes within a predetermined range.

The thin glass SG that is pressurized and cooled by the pair of cooling rolls (1) and (1') is given a high internal strain by rapid cooling strain and pressurized stress, and has a strength above a certain level. When an external stress of
It becomes G.

In addition, in this example, the back pressure within the pair of cooling rolls (1) (1") is detected and adjusted, and the surface pressure applied to the molten glass MG is always controlled to be constant. 1
By stabilizing the thickness of the thin glass SG sent out from the pulverizing rolls [2) (2'), it is possible to make the pulverization by the pulverizing rolls [2] (2') stable and highly reproducible.

Next, a specific example will be described. Under the above configuration, a pair of cooling rolls (]) (1') with a roll diameter of 20 c+m and a roll length of 40 cm are used with a roll spacing of 0. h+m
while rotating them at 50 rpm,
A pair of grinding rolls (2) (2°) with a roll diameter of 30 clll and a roll length of 40 cm, with a roll spacing of 0.1 + am.
These were placed facing each other and rotated at 6 Orpm, thereby continuously obtaining glass particles PG from molten glass MG.

In addition, the injection amount of molten glass MG at this time is the same as that of the thin glass SG sent out from the pair of cooling rolls (11 (1")).
The width was controlled to be approximately 50 questions.

The particle size distribution of the obtained glass particles PG was fine, centered on 70μ steel, within a range of several μm from 150μ steel, and the particles had a relatively sharp shape.

As described above, according to the molten glass cooling and crushing apparatus of this embodiment, fine glass particles can be continuously obtained from molten glass in the same apparatus, and the process is significantly improved compared to the conventional technology. In addition to reducing the number of glass particles, deterioration of the characteristics of the glass particles due to contamination by foreign foreign substances during the manufacturing process can be prevented and the quality can be stabilized.

It should be noted that the configuration of the cooling crushing apparatus of this embodiment described above is just one example, and for example, as shown in FIG. 2, which is an explanatory cross-sectional view of another embodiment, a pair of crushing rolls (5) ( 5'
) is provided with gear-like unevenness that meshes with each other on each roll surface (6) (6'), and not only the thin glass SG is crushed by pressurizing it, but also the roll surface (6) (6')
Further, finer glass particles PG may be obtained by the rubbing effect between the glass particles PG.

Furthermore, as in this embodiment, smooth rolls may be used as a pair of crushing rolls and these may be rotated at different peripheral speeds. It is preferable that shearing stress can also be applied, and the crushing can be ensured and efficient.

In addition, in the specific example described above, the peripheral speed of rotation of the pair of crushing rolls was set higher than the peripheral speed of rotation of the pair of cooling rolls, but this means that the crushing by the pair of crushing rolls is faster than the rotational peripheral speed of the pair of cooling rolls. This is because when the feeding speed of the thin glass is slower than the rotating peripheral speed, there is a risk that the thin glass SG delayed between the pair of cooling rolls and the pair of crushing rolls will be damaged or missing. Regarding the speed, considering the form of the crushing rolls used, the peripheral rotational speed of the pair of crushing rolls is the same as or faster than the rotational peripheral speed of the pair of cooling rolls, and the pair of crushing rolls is made of thin glass SG. It is set at a speed that does not cause the thin glass SG to break or the molten glass MG above to break due to excessive pulling down.

〔Effect of the invention〕

As described above, according to the molten glass cooling and crushing apparatus according to the present invention, fine glass particles can be continuously obtained from molten glass in the same apparatus, and the number of steps can be significantly shortened. At the same time, deterioration of the properties of glass particles due to contamination with foreign foreign substances can be prevented in advance, thereby improving productivity and stabilizing quality.

[Brief explanation of drawings]

FIG. 1 is a conceptual explanatory diagram showing the configuration of a cooling and crushing apparatus for molten glass according to an embodiment of the present invention. FIG. 2 is an explanatory cross-sectional view of another embodiment of a crushing roll used in the cooling and crushing apparatus for molten glass according to the present invention. It is. (1) (1') - Cooling roll, (2J (2') - Grinding roll, (3H3') - Scraper, (4) - Vibratory classifier, F - Melting furnace, C - Casting section, MG -Fused glass, SG-Thin glass, PC-
- Glass particles. Figure 1

Claims (4)

[Claims] (1) A pair of cooling rolls that are arranged horizontally to face each other and pressurize and cool the molten glass flowing down and injected between them to solidify it into a thin plate; A cooling and crushing device for molten glass, comprising a pair of crushing rolls that pressurize and crush thin plate-shaped solidified glass sent out from a cooling roll. (2) The pair of cooling rolls includes a pressure sensor that measures the surface pressure applied to the molten glass, and a pressure adjustment mechanism that constantly keeps the surface pressure applied to the molten glass constant based on the measured value of the pressure sensor. 2. The molten glass cooling and crushing apparatus according to claim 1, further comprising: (3) The molten glass cooling and crushing apparatus according to claim 1 and claim 2, wherein each of the pair of crushing rolls has irregularities that engage with each other on the pressure roll surface. (4) The molten glass cooling and crushing apparatus according to claim 1 and claim 2, wherein the pair of crushing rolls are both formed as smooth rolls and are rotated at mutually different circumferential speeds. .