JPH03164436A - Method and device for controlling molten glass level in glass melting device - Google Patents

Abstract

PURPOSE:To keep the molten glass level in a glass melting device constant at all times by obtaining the amt. of molten glass in the melting device from the weight difference between the device itself and the device contg. molten glass and adjusting the amt. of glass raw material to be charged with the difference from the set value. CONSTITUTION:The glass melting device A consists of a crucible 1 having a molten glass discharge pipe 4, a heater 8 for the crucible, a heater 9 for the pipe 4, a heating furnace 5 for the crucible 1 and a base 10 for carrying the members, and the device A is placed on a weigher 11 such as a load cell. The glass raw powder 2 is charged into the crucible 1 from its feeder 13, heated and melted by the heater 8 to form molten glass 3 in the crucible 1. At this time, the weight of the entire melting device plus the molten glass 3 is measured by the weigher 11, the difference from the weight of the device A is obtained, and the amt. of molten glass 3 is obtained. A controller is driven based on the difference between the obtained molten glass amt. and the preset molten glass amt., the amt. of the raw glass to be supplied to the crucible from the feeder 13 is adjusted, and the level of the molten glass 3 in the crucible is always kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application in Industry L) The present invention relates to a method and apparatus for adjusting the temperature of glass in a glass melting apparatus.

[Prior Art] Generally, a glass melting apparatus is equipped with a liquid level gauge for detecting the liquid level of molten glass.

By controlling the liquid level of 78 molten glass to a constant level using this liquid level gauge, the glass in the melting device will be uniformly rounded and the outflow pressure of the molten glass will be constant. Since the quality of the glass can be stabilized and overflow can be prevented, operational safety can be ensured.

This liquid level gauge includes contact resistance type, radiation type, and j-node type.
Various types are known, such as the Z-type and the Microwave-2 type.

[Problems to be Solved by the Invention] However, the contact resistance type level gauge has poor accuracy when the viscosity of the molten glass is high, and furthermore, the contact resistance type level gauge has poor accuracy when the viscosity of the molten glass is high. The reactant gas inside the furnace blows out from the inside and erodes the furnace body, causing serious damage to the furnace body.

In addition, in the case of radiation-type liquid level gauges, in order to ensure the safety of workers, care must be taken in the placement of the isotope source and acceptor to ensure that leakage radiation remains, and sufficient space and daily management are required. .

In the case of a laser type liquid level gauge, an opening is required in the furnace body, and as with the contact resistance type liquid level gauge, the furnace body is seriously damaged.

In the case of microwave level gauges, an opening is required for installing the waveguide, which can cause serious damage to the furnace body. Furthermore,
Maintenance such as removing volatile substances attached to the waveguide is required.

In addition, all of these liquid level gauges depend on the input raw material,
: It is difficult to accurately measure the liquid level near the injection site. Additionally, some liquid level meters have the disadvantage that the range of liquid levels that can be detected is narrow.

Therefore, the present invention does not use the liquid level gauge having the above-mentioned drawbacks, but
The object is to provide a method and a device by which the liquid level can be adjusted and maintained at a constant level.

[Means for Solving the Problem] In order to achieve this object, the method for adjusting the liquid level of a glass melting apparatus according to the present invention includes setting a predetermined weight of glass, and weighing the entire weight of the glass melting apparatus including the glass. Then, the glass weight is determined by subtracting the tare weight of the glass melting device from the weight of the entire glass melting device, and this glass weight is compared with the glass weight set above, and based on this comparison, the glass melting device is It is characterized by adjusting the amount of glass raw material added to the glass. A liquid level adjustment method according to another invention includes: setting the weight of the entire glass melting device containing a predetermined weight of glass; weighing the entire weight of the glass melting device including the glass; and weighing the entire set glass melting device; The weighed weight of the entire glass melting apparatus is compared with that of the entire glass melting apparatus, and based on this comparison, the amount of glass raw material to be replenished into the glass melting apparatus is adjusted. A liquid level barb device for a glass melting device according to another invention includes:
A weighing device that weighs the entire weight of the glass melting device including glass, and a charging amount adjusting device attached to a raw material feeder that feeds glass raw materials into the glass melting device, between the weighing device and the charging amount adjusting device. The tare weight of the glass melting device is subtracted from the weight of the entire glass melting device that is connected and arranged and weighed by the weighing device to obtain the glass weight, and the input amount adjustment device is adjusted based on the comparison between this glass weight and the set glass weight. It is characterized by being equipped with a control device that controls the Furthermore, the liquid level gJ1 regulating device according to another invention includes a weighing device for weighing the entire weight of the glass melting device including glass, and an input amount adjusting device attached to a raw material feeder that feeds glass raw materials into the glass melting device. The weight of the entire glass melting apparatus connected and arranged between the weighing device and the input amount adjusting device is compared with the weight of the entire glass melting device weighed by the weighing device, and based on this comparison, It is characterized by being equipped with a control device that controls the input amount adjusting device. [Example] Next, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the longitudinal plane of the glass melting apparatus A according to this embodiment. In FIG. 1, 1 is a glass melting crucible for melting the input unmelted glass raw material 2, 3 is molten glass, and 4 is an outflow pipe connected to the bottom of this glass melting pot 1. The glass melting crucible 1 and the outflow pipe 4 are surrounded by furnace bodies 5 and 6, respectively, and are supported by the furnace body 5 via a support stand 7. Furnace bodies 5 and 6 are connected to each other. Heaters 8 and 9 are provided between the glass melting pipe 1 and the furnace body 5, and between the outflow pipe 4 and the furnace body 6, respectively. 10 is the base of the furnace body. The entire glass melting apparatus A consists of the glass melting crucible 1, the unmelted glass raw material 2, the molten glass 3, the outflow pipe 4, the furnace body 5.6, the support stand 7, the heaters 8 and 9, and the furnace body base 10. The weight is supported at three or four locations by load cells (strain gauges) 11 serving as weighing devices, and this load cell 11 is connected to a control device 12 . Based on the signal from the load cell l1, this control device 12
a weight detection section that detects the weight of the glass melting device A; a calculation section that calculates the weight of the glass by subtracting the empty weight of the glass melting device A measured in advance, that is, the tare weight from this weight; and a display section. , based on the weight of this glass,
It is equipped with a control unit that controls the input amount adjusting device 14 attached to the raw material input machine 13, and is programmable. The raw material feeder l3 is, for example, an electromagnetic feeder or a screw feeder, and the feed amount adjustment device 14 controls the vibration frequency or rotational speed, operating time, etc. of the raw material feeder 13 based on the signal supplied from the control device l2. to adjust the input amount of glass raw materials.

In the case of the glass melting apparatus having the above structure, a predetermined glass weight is input (set) to the control device l2 in advance. This predetermined glass weight may be the weight corresponding to the desired liquid level of the glass in the glass melter, ie, the glass weight when the liquid level is at the desired level, or it may be the weight at which charging should begin.

Furthermore, the empty weight of melting device A without glass 7 (
The tare weight) is weighed in advance using a load cell II. Next, after inputting raw materials from the raw material input device 13, the total weight of the melting device A during melting is weighed by the load cell 11, and the control device 12 subtracts the tare weight from the total weight to calculate the glass weight (unused). (including molten glass raw material 2). Based on the comparison between this glass weight and the set glass weight, the control device 12 controls the input amount adjusting device l4 to adjust the replenishment input amount from the raw material input device l3. Thereby, the glass 3 in the glass melting
can maintain the liquid level at a desired level.

Weigh the entire weight of molten glass equipment A as above? Since the amount of glass input is adjusted by using the molten glass, the liquid level of the molten glass can be controlled without using a liquid level gauge which has many drawbacks as in the prior art.

Therefore, this liquid level control method enables accurate liquid level control at any liquid level. Further, since there is no need to provide an opening in the furnace body, damage to the furnace body due to erosion does not occur. Furthermore,
There is no need for sufficient space or daily management to ensure worker safety, and maintenance of the weighing device 11 is easy. Furthermore, the unmolten glass raw material 2 can also be weighed.

Next, with reference to FIG. 2, a specific example of the method for adjusting the glass liquid level according to the embodiment described above will be described.

First, before charging the glass raw materials, the charging start weight set value W■ is set to 10 kg in the calculation section of the control device 12, and the charging amount of the raw material charging machine 13 is set to 0.0 kg per charging command.
Set to s lCg. Furthermore, input the tare weight of the glass melting apparatus A, and set it to subtract this tare weight from the weighed weight each time (tare subtraction). As a result, the current glass weight value W shown on the display is Olcg
become. Next, Hara? ! '-1 Input machine I3G, 2 Input 12 kg of glass raw material FT (force glass current weight wr
y = 12 kg), the temperature of the glass melting tube 1 is maintained at iooo'c and the glass is melted 3゜.

After that, set the temperature of the outflow pipe 4 to 950″C,
Yong L11! Ura the glass. put out }When the current value of the glass weight W,, becomes 10 kg or less due to the outflow of molten glass, the control device 12 issues a raw material input command, the input amount adjustment device 14 operates the raw material input machine 13, and
g of glass raw material is added. As a result, the glass main star current value Wrv exceeds 10 kg.

Thereafter, when the current glass weight value W,v becomes less than tokg again, a raw material 1 loading command is issued, and 0.5 kg of raw material is loaded. By repeating this, the current value of glass electricity W■ can be changed from 10 kg + 0.5 kg to 10 kg.
It is possible to maintain the range up to

By replenishing the amount decreased due to the outflow from the outflow vibrator 4 in this way, the liquid level of the glass can be kept constant without using a liquid level gauge, and the supply of glass can be stabilized and the operation be safe. be able to.

Next, a modification of the glass liquid level adjustment method will be described.

In this modification, the weight of the entire glass melting apparatus A including a predetermined weight of glass is determined by the glass melting apparatus weight setting value (csr
) is input to the control device 12 as follows. This predetermined weight of glass may be the weight corresponding to the desired liquid level of the glass in the glass melter Lupo i, i.e. the weight of the glass when the liquid level is at the desired level, or it may be the weight at which charging should start. . In the control device 12, a detailed view of the entire glass melting apparatus A including glass measured by the load cell 11 (glass melting apparatus electric power current value GpV) and the above-mentioned glass melting apparatus weight setting value (G3F) are calculated. Will be compared.
Based on this comparison, by controlling the input amount adjusting device l4 and adjusting the replenishment input amount from the material inputting machine l3,
Adjust the liquid level of molten glass. A specific example of this method will be explained based on FIG.
The calculation section is manually operated. In this case, a predetermined weight of glass raw material is charged by the raw material feeder 13, the weight of the entire glass melting apparatus including this glass is weighed, and this weight is set as the glass melting apparatus weight setting value G 5 p. Furthermore, if the desired glass weight and the tare weight of the glass melting device A are known in advance (in this case, the glass melting device A), the glass 7.
The melter weight setting value G, , may also be input. At this time, assuming that the tare weight of the glass melting apparatus A is 150 kg and the weight of the glass is 10 kg, the glass melting apparatus weight setting value G1 is 160 kg.

Control device 12: The respective weight of the entire glass melting apparatus A including the glass (glass melting apparatus weight current value GF
v) becomes equal to or less than the glass melting device weight set value G,, the raw material feeder 13 removes the glass raw material to 0.
．． It is programmed to refill 5 kg. After the molten glass starts flowing out, the current weight GPv of the glass melting device measured by the load cell 11 is 160.
kg or less, the control device 12 issues a glass raw material charging command, and the charging amount adjusting device 4 and the raw material charging machine 13 replenish 0.5 kg of glass raw material. As a result, the current weight of the glass melting equipment GPv is approximately 160.5 kg (the glass weight is approximately 10.5 kg).
g), and then the current value of the summer weight of the glass melter is 1
When the weight falls below 60kg, a raw material input command is issued and the weight is 0.
5 kg of raw material is input.

By repeating this, the glass liquid level is kept constant. Next, a modification of the weighing structure of the glass melting apparatus 8 will be described with reference to FIGS. 4, 5, and 6.

In the case of FIG. 4, the glass melting apparatus A is placed on a pedestal XOa and suspended from above for weighing.

Therefore, the pedestal IQa and the load cell lla are connected by a suspension l5.

In the case of Figure 5, glass? A holder 16 having an L-shaped cross section is attached to the upper edge of the furnace body 5 of the melting apparatus A, and this holder 16 is suspended from the load cell Ilb via a hanging rod 17. In the case of FIG. 6, one end of the pedestal 10b on which the glass melting apparatus A is mounted is supported by a load cell ie, and the other end is supported by a fixed shaft 1B so as to be able to swing vertically within a predetermined range. There is. in this case,
Load cells only need to be placed in one or two locations. In addition, in the case of the above-mentioned weighing structure, the number and arrangement position of load cells can be arbitrarily selected. Although the embodiments have been described above, the present invention can be applied to various types of glass melting apparatuses other than those described above. For example, a multi-vessel glass melting apparatus equipped with a melting tank, a defoaming tank, and a homogenizing tank with a stirring mechanism can also be installed on the base of the furnace body and its weight can be measured. In this case, the melting tank, defoaming tank, and homogenization tank are arranged side by side on the base of the furnace body, and the outflow pipe is connected to the bottom of the homogenization tank. Furthermore, although a Kanthal wire, a SiC resistance heating element, etc. are usually used as the heater, other heating means may also be used.

Further, a flexible flat iJ41 can be connected to both heaters, and the other end of the flat wire can be connected to the electric wire of the heater, and can be supported by an appropriate external support device. Thereby, power supply 4. The weight of the power supply wire no longer acts on the furnace body, and the influence of the weight of the power supply wire on the weight of the glass melting equipment can be eliminated. Furthermore, weighing devices other than load cells, such as electromagnetic scales, can be used.

〔Effect of the invention〕

In the present invention, the liquid level of the glass is adjusted to [ff] by controlling the amount of input based on the weight of the glass melting device without using a liquid level gauge, so that the liquid level can be set at any liquid level within a wide range. , accurate liquid level adjustment can be performed, and as a result, the quality of molten glass can be stabilized and operation safety can be ensured. Furthermore, the furnace body is not damaged, there is no need to ensure the safety of workers, and maintenance is simple.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a glass melting apparatus according to an embodiment of the present invention, FIG. 2 is a flowchart showing a method for adjusting the glass liquid level, FIG. 3 is a flowchart showing a modification of the method for adjusting the glass liquid level, and FIG. Figures 5 and 6 are schematic diagrams showing various weighing structures. 1...Glass molten Lupo, 2...Unmelted glass raw material, 3... Molten glass, 4...Outflow pipe,
5, 6...furnace body, 7...support stand, 8.9
... Heating heater, 10... Furnace body base, I
Oa, tob... mount, 11. lla, llb, IL
c...Load cell (weighing device), 12...Control device, l3...Raw material feeder, l4...Input amount adjustment device, 15.17...Hanging rod, 16.
...Holder 18...Shaft, A...Glass melting device

Claims (1)

[Claims] 1. Set a predetermined glass weight, weigh the entire glass melting device including the glass, and calculate the glass weight by subtracting the tare weight of the glass melting device from the weight of the entire glass melting device. , the glass liquid level of the glass melting apparatus is characterized in that the glass weight is compared with the glass weight set above, and based on this comparison, the amount of supplementary glass raw material input into the glass melting apparatus is adjusted. Adjustment method. 2. Set the weight of the entire glass melting device containing a predetermined weight of glass, weigh the entire glass melting device including glass, and calculate the set weight of the entire glass melting device and the weighed weight of the entire glass melting device. and based on this comparison,
A method for adjusting a glass liquid level in a glass melting device, the method comprising adjusting the amount of glass raw material added to the glass melting device. 3. A weighing device that weighs the entire weight of the glass melting device including glass; A charge amount adjustment device attached to a raw material feeder that feeds glass raw materials into the glass melting device; and a combination of the weighing device and the charge amount adjustment device. placed connected between
Control that subtracts the tare weight of the glass melting device from the weight of the entire glass melting device weighed by the weighing device to obtain the glass weight, and controls the input amount adjusting device based on a comparison between this glass weight and a set glass weight. A glass liquid level adjusting device for a glass melting device, characterized in that it is equipped with a device. 4. A weighing device that weighs the entire weight of the glass melting device including the glass, a charging amount adjusting device attached to a raw material feeder that feeds glass raw materials into the glass melting device, and a combination of the weighing device and the charging amount adjusting device. placed connected between
Compare the set weight of the entire glass melting device with the weight of the entire glass melting device weighed by the weighing device,
A glass liquid level adjusting device for a glass melting apparatus, comprising: a control device that controls the input amount adjusting device based on this comparison.