JPH0680426A - Device for charging glass raw material - Google Patents

Abstract

PURPOSE:To unify the quality of molten glass and to facilitate simplification of an apparatus and maintenance and control thereof by charging raw materials using a bucket capable of free taking in and out of a melting tank, CONSTITUTION:The upper part of a base 1 of a device (A) for charging glass raw materials is composed of a rectangular frame fixed to a prescribed position of the front part of a melting tank (B). A bed 2 movable in the longitudinal direction is set on the base 1 and a slider 3 movable in the left and right direction is set on the bed 2. A bucket-supporting arm 5 supporting a bucket 4 at the top part is attached thereto so as to be rotatable in the right and left peripheral direction of the shaft (perpendicular direction) by an actuator 6. To the furnace opening on the front side of a melting furnace (B), a door 7 for closing the furnace opening is attached movably in the right and left direction and the door involves a shutter 9 for opening and closing an opening 8 for charging raw materials. The door 7 for closing the furnace opening is wide enough to always keep the furnace opening in a closed state even if the opening 8 for charging raw materials is moved to any position. These operations are controlled by a raw material charger control board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass raw material charging device for charging glass raw material into a melting tank of a glass melting furnace.

[0002]

2. Description of the Related Art A method for charging a glass raw material into a melting tank of a glass melting furnace is a refining tank in which the liquid level (level) of the glass raw material melted in the melting tank is communicated with the melting tank. Or, a method is generally used in which a glass level detecting device is attached to a place such as a feeder, and as a result of detection, a glass raw material corresponding to the level state is charged into a melting tank. And if you roughly divide into the glass melting method,
It can be divided into two types: a combustion furnace using oil or gas as an energy source, and an electric furnace using electric energy. In addition, in the melting method of the electric melting furnace, when the atmosphere temperature in the melting tank is 500 ° C or less, the surface is always covered with the raw material, that is, the raw material does not change due to the thermal effect of the temperature in the furnace. On the contrary to the cold top method, there is a hot top method in which the atmosphere temperature in the melting tank is maintained at a high temperature of 1000 ° C or higher and the surface of the melting tank is always red hot. Among these two types, in the cold top method,
Since the temperature inside the melting tank is relatively low, the method of continuously feeding the glass raw material into the melting tank with a highly heat-resistant rubber belt conveyor is often adopted (see Japanese Utility Model Publication No. 2-102432). As a raw material charging device other than the conveyor, a metal vibrating conveyor, a vibrating feeder, or a metal belt conveyor may be used to continuously feed the raw material.

When the melting tank is of a hot top type, there is almost no charging method of a method of inserting a charging machine into a melting tank in a high temperature state and dropping a raw material. In many cases, the screw type, pusher type, vibration type, etc. are all pushed in from the side wall of the melting tank.

[0004]

However, in the cold top method in the electric furnace, when the glass raw material is charged using the rubber belt conveyor, the heat-resistant rubber belt is normally used at a temperature of about 250 ° C.
Since it deteriorates quickly and has a life of only several months, it is necessary to replace the belt each time, which is not preferable in terms of work and maintenance of the apparatus. Further, in a metal vibrating conveyor or vibrating feeder, or a metal belt conveyor, etc., since it is made of metal, it has better heat resistance than a rubber belt conveyor, but like a vibrating conveyor or a vibrating feeder, vibration is utilized. If the glass raw material is transported by vibrating, there is a risk of causing the raw material to be separated during the vibration transportation process. In particular, since this glass powder raw material is a mixture of several raw materials uniformly, when vibrated, it is separated due to the difference in specific gravity and the difference in particles, and the density tends to be offset.

Raw materials for glass include silica, alumina, borax,
Boric acid, salt stone, soda ash, etc. are used in various ways, but in a single raw material, various things such as those that melt at around 700 ° C to those that melt at 2000 ° C such as silica sand and alumina are mixed. Even in the case of borosilicate glass, which has a relatively high melting temperature, the temperature in the melting tank is around 1650 ° C, and there is a large difference in melting point with a single raw material, but the raw material with a low melting point is well mixed with the raw material with a high melting point. , Plays a role as a melting material and reacts with high-melting silica or alumina to melt them.

Therefore, when the raw materials are separated, a deviation occurs, and for example, when the density of silica sand becomes high, unmelted batch stone in an insufficiently melted state or bubbles generated by the gas generated in the melting reaction process is generated, resulting in deterioration of quality or It causes unevenness. Furthermore, in the case where the surface of the melting tank is other than the complete hot top method, it is necessary to charge the raw materials uniformly on the entire surface of the melting tank in a state without unevenness. In each case, the raw material is fed into the furnace while it is being conveyed by the loading machine itself, so the tip of the loading machine (raw material lowering part) enters the furnace, while feeding forward and while moving backward. There is a change in the input amount when it is being input, which causes a deviation.
In order to prevent this, it is necessary to perform complicated control in the operation of the throwing machine or to make a large scale by mounting a hopper on the throwing machine itself. Also, in the case of horizontally feeding on the surface of the melting tank, it is not possible to uniformly feed the raw material unless the conveyor and the entire pedestal receiving the conveyor are moved at a considerably high speed, so the strength durability of the equipment is required, It is easy to get big.

When the melting tank is of the hot top type, the temperature around the charging port into which the raw materials are pushed is unavoidable, so the temperature difference in the melting tank becomes large, and the convection of glass due to the temperature difference becomes active. If the melting tank is small, there is a risk of generating bubbles or batch stones due to unmelting.

[0008]

The present invention solves the above-mentioned problems in the prior art and obtains a glass raw material charging device suitable not only for a cold top type melting tank but also for a hot top type melting tank. It provides a glass raw material charging device that replaces the continuous feeding method using a conveyor or the like for the feeding into the melting tank with a bucket and intermittently feeds the glass material with a bed 2 that is movable on the base 1 in the front-back direction. A glass raw material composed of a slider 3 movably provided on the bed 2 in the left-right direction, and a bucket support arm 5 provided on the slider 3 rotatably in the axial direction and having a bucket 4 at its tip. Input machine
A is characterized in that the bucket 4 is installed so that it can freely move in and out from the raw material charging port of the melting furnace B. When the glass raw material charging device according to the present invention is used in a hot-top type melting tank, it is preferable that the bucket support arm be equipped with a cooling mechanism and the raw material charging port of the melting tank be equipped with an opening / closing door. In the glass raw material charging device in the system, it is preferable that temperature sensors are installed at appropriate points on the ceiling surface of the melting tank and at a plurality of points above and below the furnace wall.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a glass raw material charging apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of the arrangement relationship between the glass raw material charging device A and the melting tank B according to the present invention and a glass raw material charging procedure. A base 1 of the glass raw material charging device A is configured in a rectangular frame shape. It is fixed in place in front of B. A bed 2 that is movable in the front-rear direction is installed on the base 1, and a slider 3 that is movable in the left-right direction is provided on the bed 2. A bucket support arm 5 having a bucket 4 at its tip is rotatably attached to the slider 3 by an actuator 6 in the left and right axial circumferential directions (vertical direction).

A furnace port closing door 7 is provided at the front side of the melting tank B so as to be movable in the left and right directions. The furnace port closing door 7 is provided at the furnace port closing door 7. Raw material inlet
An opening / closing door 9 for opening / closing 8 is provided. Furnace mouth closing door 7
Has a width such that the raw material inlet 8 is always closed even if the raw material inlet 8 is moved to any position of the raw material. The furnace door closing door 7 and the opening / closing door 9 are moved or opened / closed by a motor or an air cylinder (not shown) which is operated by a door movement signal and a door opening / closing signal from a raw material feeding machine control panel (not shown below). To be done.

FIG. 2 is a perspective view of the glass raw material charging device, in which a bucket 4 is provided in front of the base 1 of the glass raw material charging device.
1st to 3rd vertical movement limits connected to the raw material feeding machine control panel operated by the vertical movement cam 13 fixed to the bed 2 when the set depth in the melting tank B is reached. Switches 10 to 12 are attached at a predetermined interval, and when the bed 2 moves to the left and right limits on the left and right sides of the bed 2, that is, the bucket 4 is set to the predetermined left and right inside the melting tank B. When you move to the movement width limit,
The left lateral movement limit switch 16 and the right lateral movement limit switch 17 connected to the raw material feeding machine control panel, which are operated by the left and right lateral movement cams 14 and 15 fixed to the slider 3.
Are installed respectively.

The bed 2 is vertically movably mounted on a pair of guide rails 18, 18 provided on both upper sides in the longitudinal direction of the base 1, and is fixed below one guide rail 18. The rack gear 21 present in the rack 2 has a pinion 20 rotated by a reversible motor 19 fixed to the lower surface of the bed 2.
And the motor 19 is operated on the basis of the bed movement signal from the raw material feeding machine control panel.
Move 2 back and forth. The slider 3 is movably mounted on a pair of guide shafts 22 and 22 which are laid in the width direction of the bed 2, and is an air cylinder provided on the bed 2.
The slider 3 is moved left and right by operating 23 based on the slider movement signal from the raw material feeding machine control panel. A hollow bucket support arm 5 having a bucket 4 at its tip is attached to the slider 3, and its rear end is connected to an actuator 6. The actuator 6 rotates the bucket support arm 5 leftward or rightward based on the bucket rotation signal from the raw material feeding machine control panel, and feeds the glass raw material 28 in the bucket 4 into the melting tank B.

In the hollow portion 51 of the bucket support arm 5,
As shown in FIG. 3, a cooling water supply pipe 24 is provided from the rear end portion to near the front end portion, and a cooling water supply hose (not shown) is connected to the inlet 241. An outlet 25, which is a drainage outlet for draining the cooling water in the hollow portion 51, is provided near the inlet 241, and a cooling water drainage hose (not shown) is connected to the outlet 25. The cooling water supplied from the inlet 241 is jetted by the cooling water supply pipe 24 to the tip end side of the bucket support arm 5, that is, the bucket 4 side, and cools the bucket support arm 5 while the outlet 25 is being cooled.
Emitted from. Cooling water is turned on and off as needed
Water supply and stop may be performed based on a cooling water supply / stop signal from the raw material charging machine control panel, or water may be constantly supplied / drained.

The bed 2 of the glass raw material charging device A is at the rear end position, the slider 3 is at the left end position, the furnace port closing door 7 of the melting tank B is at the left limit position, and the raw material charging port 8 is an opening / closing door.
The state of Fig. 1 closed with 9 is the origin position. As shown in FIG. 4, a hopper 27 having a rotary valve 26 is disposed above the bucket 4 at the origin position, and a raw material measuring device (not shown) is previously provided in the hopper 27. The glass raw material 28 measured in step 1 is sequentially injected from the raw material injection ports 29 and 30 in response to a raw material supply signal from the raw material feeding machine control panel. The glass raw material 28 is discharged into the bucket 4 by opening the rotary valve 26 in response to a rotary valve operation signal from the raw material feeding machine control panel. As shown in FIGS. 1 and 5, on the ceiling surface 31 of the melting tank B, the bucket 4 rotates left and right at predetermined positions within the vertical movement range and the horizontal movement range in the melting tank B, and the glass raw material 28 A temperature sensor 32 is provided at a position corresponding to the points shown in a to l of FIG. When the temperature sensor 32 is normal and stable without eruption of the layer of the glass raw material 28 in the melting tank B as in (a) of FIG. 6, or as in (b), some eruption occurs. However, as a whole, the layer of glass raw material 28 is stable, and when it is in the normal range, it is exceptional. However, if the temperature inside the tank rises abnormally even partially, the temperature sensor 32 near the eruption part detects it and sends information on the abnormal rise in the tank temperature to the raw material feeding machine control panel, and this control A material priority input signal for preferentially inputting the glass raw material 28 from the board to the eruption portion is sent to the glass raw material input device A, and the glass raw material 28 is preferentially supplied to the eruption point in the melting tank B in the melting tank B. The layers are fed until stable.

Temperature sensors 35, such as thermocouples, are attached to the two furnace walls 33, 34 near the rear end of the melting tank B in three steps at appropriate intervals in the vertical direction. , Is connected to the raw material feeder control panel. The three upper and lower temperature sensors 35 constantly detect the internal temperature of the melting tank B and send it to the raw material feeding machine control panel. In the control panel, for example, the upper temperature sensor 35 detects a temperature rise above a predetermined range. When this happens, the power supply circuit to the melting electrode 41 attached to the melting tank B is cut off, or the glass raw material 28 is put into the melting tank B, and the temperature sensor 35 in the middle and lower stages lowers the temperature below a predetermined range. Is detected, the feeding of the glass raw material 28 is stopped, or the melting electrode 41
Control is performed by connecting the energizing circuit to the. In addition, the glass raw materials at the glass raw material charging points a to l in the melting tank B are
The order of charging 28 is selected by a selection device such as a pin board provided on the raw material charging machine control panel. In addition,
When the temperature sensors 32 and 35 detect an abnormal temperature in the melting tank B, the glass raw material 28 is automatically charged into the melting tank B as described above, or the power to the melting electrode 41 is cut off. Of course, if the detection of the abnormal temperature is confirmed, the glass raw material 28 may be manually instructed by confirming the detection of the abnormal temperature and changing the position of the pin of the pin pad.

The melting tank B is connected to the working tank C via a throat 36, and a chamber 38 is formed above the riser portion 37 of the working tank C, and the chamber 38 is provided with the molten glass dough 281. A level detector 39 and an overflow block 40 are installed. The level detector 39 is connected to the raw material feeder control panel, detects the surface level of the molten glass dough 281 in the chamber 38 at every predetermined time, and sends the detection signal to the raw material feeder control panel, When the surface level becomes equal to or lower than a predetermined value, a raw material charging start command signal is sent to the glass raw material charging device, and when the surface level reaches a predetermined value, the raw material charging stop command signal is sent to the glass raw material charging device. Overflow block 40, chamber
When the molten glass dough 281 in the 38 reaches a predetermined level or more, or when waste materials such as scum floating on the surface of the molten glass dough 281 are discharged to the outside of the furnace, the molten glass dough 281 is removed from the surface layer. Let it drain.

A glass raw material measurement command for measuring the glass raw material 28 supplied into the hopper 27, and a plurality of kinds of glass raw materials 28 such as a measured powder raw material and cullet are mixed and supplied into the hopper 27. Raw material mixed supply command, open / close command of rotary valve 26 for discharging glass raw material in hopper 27 into bucket 4, reversible motor 19 for moving bed 2 forward or backward by a set predetermined distance. Drive command, operation command of the air cylinder 23 to move the slider 3 to the left or right limit, operation command of the actuator 6 to rotate the bucket 4 in either the left or right vertical direction, the hollow inside the bucket support arm 5. Cooling water supply / stop command for supplying cooling water to the inside of the part 51 and stopping the supply, and the temperature detected by the temperature sensor 32. And Zui, glass raw materials
The glass material 28 is supplied into the melting tank B on the basis of the priority feed / stop command for preferentially supplying 28 into the melting tank B, the temperature detected by the temperature sensor 35 or the level detection by the level detector 39. For starting / stopping the raw material charging, driving command for a reversible motor (not shown) to move the furnace port closing door 7 to the right or left (origin position), and opening / closing the raw material charging port 8 of the furnace port closing door 7. An operation command of an air cylinder (not shown) for opening and closing the opening / closing door 9 and a melting electrode attached to the melting tank B.
All the commands for connecting / disconnecting the energizing circuit 41, other condition setting and various commands for security, etc., are all performed by the raw material feeding machine control panel including known control means.

In the glass raw material charging device thus constructed, an example will be described in which the glass raw material 28 is sequentially charged into each point a to 1 in the melting tank B by the cold top method. The glass raw material charging device is stopped at the origin position shown in FIG. When the temperature sensor 35 detects a temperature decrease or the level detector 39 detects a level decrease of the molten glass dough 281 in the chamber 38, the glass raw material 28 is sent by a command signal from the raw material feeding machine control panel based on the detected information. Is measured, and the measured glass raw material 28 is supplied from the raw material inlets 29, 30 into the hopper 27 and temporarily stored. After the glass raw material 28 is supplied into the hopper 27, the rotary valve 26 of the hopper 27 is opened, the glass raw material 28 is discharged into the bucket 4 located immediately below the hopper 27, and the rotary valve 26 is closed. Bucket 4
When the glass raw material is discharged into the inside, the reversible motor 19 rotates forward, and the bed 4 is moved forward and stopped until the bucket 4 is positioned immediately before the opening / closing door 9, and then the opening / closing door 9 is opened. When the opening / closing door 9 is opened, the reversible motor 19 rotates further forward, and the bucket 4 moves at the point a on the straight line L1.
When it reaches the -d position, it stops rotating. Ie bed
The bed 2 stops when the second vertical cam 13 operates the first vertical limit switch 10. Simultaneously with this stop, the bucket support arm 5 is rotated counterclockwise by the actuator 6, and the glass raw material 28 in the bucket 4 is fed to the point a in the melting tank B. After the completion of feeding the raw materials, the bucket support arm 5 is reversed by the actuator 6 and returns to the original position, and at the same time, the reversible motor 19 rotates in the reverse direction to move the bed 2 back to the original position. When the bed 2 retreats to the origin position, the opening / closing door 9 closes the raw material inlet 8 of the furnace port closing door 7 and everything returns to the origin position.

By repeating the same operation as above, the second cam limit switch 11 and the third vertical motion limit switch are operated by the vertical cam 13.
12 is operated, the bucket support arm 5 is rotated left or right, and the glass raw material 28 is charged into the points a to f in the melting tank B. Further, when the glass raw material 28 is charged into the points g to l in the melting tank B, the air cylinder 23 moves the slider 3 to the right by a command signal from the raw material charging machine control panel, and the right lateral moving cam 15 is moved. Is the right lateral movement limit switch
Activate 17 to stop slider 3 at the right side travel limit. On the other hand, simultaneously with the movement of the slider 3, the furnace port closing door 7 is moved to the right side, and its raw material inlet 8 is stopped at a position corresponding to the straight line L2 of the bucket 4. Then, the same operation as described above is repeated, and the glass raw material 28 is put into the melting tank B at points g to l. When the feeding of the glass raw material 28 to the points g to l is completed, the air cylinder 23 is operated, the slider 3 is moved to the left limit, that is, the origin position, and the furnace port closing door 7 is also moved to the left side. Return to position. When the glass raw material 28 is charged, the points a to l at which the glass raw material 28 is charged are all set automatically or manually by the raw material charging machine control panel. When any of the plurality of temperature sensors 32 detects an abnormal temperature and the glass raw material 28 is preferentially charged into any one of the points a to l in the melting tank B,
The glass raw material 28 is charged by the same operation as described above.

Next, when the glass raw material 28 is sequentially charged to the same points a to l in the melting tank of the hot top system, the operation of the glass raw material charging device operates in the same manner as described above. However, if the bucket support arm 5 is inserted into the hot-top type melting tank, the heat in the melting tank may deform and damage it in a short period of time.
Cooling water is continuously supplied from the inlet 241 of the bucket bearing arm 5 into the bucket bearing arm 5, and is drained from the outlet 25 of the bucket bearing arm 5 to cool the bucket bearing arm 5 and the glass raw material 28 is charged. In this embodiment, the bucket support arm 5 is hollow and the cooling water is circulated in the hollow portion 51. However, the bucket 4 has a double wall, and the cooling water is also stored in the space of the double wall. Of course, it may be circulated, but it is also a cold top type melting tank.
When the glass raw material 28 is charged into B, it is obvious that the bucket supporting arm 5 may be cooled and charged.

[0021]

Since the present invention is constructed as described above, it has the following effects. Since the glass raw material is not a continuous supply method using a conveyor or a vibration feeder, but an intermittent supply method using a bucket, regardless of whether it is a cold top method or a hot top method melting tank, without separating the powdered glass material, and It can be evenly charged into the melting tank to homogenize the molten glass dough, prevent the generation of bubbles due to batch stones and gas, and help improve and homogenize the product quality.
If the melting tank is a cold top type, if temperature sensors are installed at appropriate points on the ceiling surface of the melting tank and at multiple points above and below the furnace wall, it is necessary to feed the raw material into the tank based on the information obtained from this. Etc. can be automatically controlled and managed. Even if the melting tank is of the hot-top type, cooling the bucket support arm inserted into the melting tank allows the glass raw material to be evenly added to the entire surface of the melting tank, and the temperature of various parts in the melting tank can be increased. The difference can be made as small as possible,
It prevents bubbles and batch stones from being generated by convection of glass, and can homogenize the molten glass dough even in a small-capacity melting tank.In addition, the glass raw material is an intermittent supply method using buckets. Since the raw material charging port is closed, the temperature drop in the melting tank can be prevented as much as possible, and the thermal efficiency can be improved. Further, since the glass raw material charging device has a simple structure, it does not require a large-scale device as in the past, the safety management of the device is easy, and the durability is high.

[Brief description of drawings]

FIG. 1 is an explanatory view of an arrangement of a glass raw material charging apparatus according to the present invention and a melting tank, and a glass raw material charging procedure.

FIG. 2 is a perspective view showing a glass raw material charging device according to the present invention with a part thereof omitted.

3 is a perspective view showing a part of the bucket support arm in FIG. 2 by cutting away.

FIG. 4 is a sectional view for explaining the operation of a bucket and a hopper arranged above the bucket.

FIG. 5 is an explanatory view of a furnace port closing door, an opening / closing door, a temperature sensor, a level detector, etc., showing a melting tank and a working tank in cross section.

FIG. 6 is an explanatory diagram of an eruption state of the glass raw material in the melting tank.

[Explanation of symbols] A ・ ・ ・ Glass raw material charging device 9 ・ ・ ・ Opening / closing door B ・ ・ ・ Melting tank 24 ・ ・ ・ Cooling water supply pipe 1 ・ ・ ・ Base 25 ・ ・ ・ Outlet 2 ・ ・ ・ Bed 28 ・・ ・ Glass material 3 ・ ・ ・ Slider 31 ・ ・ ・ Ceiling surface 4 ・ ・ ・ Bucket 32,35 ・ ・ ・ Temperature sensor 5 ・ ・ ・ Bucket support arm 33,34 ・ ・ ・ Furnace wall 8 ・ ・ ・ Material input port 51 ・ ・ ・ Hollow part of bucket support arm 241 ・ ・ ・ Inlet

Claims (3)

[Claims] 1. A bed 2 movably provided on the base 1 in the front-back direction, a slider 3 movably provided on the bed 2 in the left-right direction, and a slider 3 on the slider 3.
It is rotatably provided around the shaft and has a bucket 4 at the tip.
A glass raw material charging device A comprising a bucket supporting arm 5 having a bucket supporting arm 5 and a bucket raw material charging device A in which the bucket 4 is installed so as to be freely inserted and withdrawn from a raw material charging port of a melting tank B. 2. A cooling mechanism 24, 51 for the bucket support arm 5.
The glass raw material charging device according to claim 1, wherein the glass raw material charging port is provided with an opening / closing door 9 at the raw material charging port 8 of the melting tank B. 3. An appropriate portion of the ceiling surface 31 of the melting tank B, and
The glass raw material charging device according to claim 1 or 2, wherein temperature sensors 32 and 35 are installed at a plurality of upper and lower portions of the furnace walls 33 and 34.