JP2012025627A - Raw material powder mixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a raw material powder mixing device capable of accurately mixing raw material powders in a short time.SOLUTION: The raw material powder mixing device includes: a raw material powder storage silo 1 having a raw material powder storage space 1a; a measurement silo 4 having a measurement space 4a for a raw material powder G supplied from the raw material powder storage silo 1; and a mixing mixer 7 having a mixing space 7a for the raw material powder G measured by the measurement silo 4. When the material powder is dropped to be supplied from the raw material powder storage space 1a to the measurement space 4a via a first supply passage 3 by using a first air passage 14 connecting the raw material powder storage space 1a and the measurement space 4a together, a pressure difference between the raw material powder storage space 1a and the measurement space 4a is adjusted. When the raw material powder G is dropped to be supplied from the measurement space 4a to the mixing space 7a via a second supply passage 6 by using a second air passage 15 connecting the measurement space 4a and the mixing space 7a together, a pressure difference between the measurement space 4a and the mixing space 7a is adjusted.

Description

  The present invention measures the raw material powder so as to have a predetermined mixing ratio, and then mixes the measured raw material powder while mixing to prepare a mixed powder used for a molten glass raw material. Regarding improvements.

  Various glass products such as glass substrates for flat panel displays (FPD) are manufactured by melting a molten glass raw material in a melting furnace and then cooling the molten glass while forming it into a predetermined shape (for example, (See Patent Document 1). This molten glass raw material is composed of a mixed powder (also referred to as a batch) prepared by mixing a plurality of types (for example, about 10 types) of raw material powders at a predetermined mixing ratio.

  As a raw material powder blending apparatus for producing such blended powder, for example, a device as shown in FIG. This raw material powder blending apparatus includes a raw material powder storage silo 101 that stores raw material powder G, a measuring silo 102 that measures the raw material powder G supplied from the raw material powder storage silo 101, and a raw material powder G that is measured by the measuring silo 102. And a blending mixer 103 for blending as a basic configuration. In the illustrated example, the weighing silo 102 is supported via a weighing device (for example, a load cell) 102a, and the total weight of the weight of the weighing silo 102 and the content thereof is measured by the weighing device. It is supposed to be configured.

  The raw material powder G is supplied from the raw material powder storage silo 101 to the measuring silo 102 through a supply path 104 that connects the raw material powder storage silo 101 and the measuring silo 102. Thereafter, the supply of the raw material powder G is stopped at the stage where the weight of the raw material powder G measured by the measuring silo 102 shows the specified value. Thus, when the measurement of the raw material powder G is completed in the measuring silo 102, the raw material powder G in the measuring silo 102 is connected between the measuring silo 102 and the mixing mixer 103 in order to form the mixed powder Gm. The mixture is supplied to the mixing mixer 103 through 105 and mixed while being mixed in the mixing mixer 103.

  Here, the raw material powder G is often fine particles of about several to several tens of micrometers, for example. As a result, when the raw material powder G is supplied from the raw material powder storage silo 101 to the measuring silo 102 or when the raw material powder G is supplied from the measuring silo 102 to the blending mixer 103, dust generation from the raw material powder G is likely to occur. Become. Therefore, when the measuring silo 102 and the blending mixer 103 are in an unsealed state having an opening, the raw material powder G may be scattered from the opening to the external space, and the external space may be contaminated. Therefore, it is common to place dust collectors 106 and 107 close to the openings of the measuring silo 102 and the blending mixer 103 and collect the raw material powder G scattered in the external space with the dust collectors 106 and 107.

  On the other hand, when such a configuration is adopted, if the raw material powder G is actively collected by the dust collectors 106 and 107, the measurement error in the measuring silo 102 becomes large, or the measured raw material powder G Part of the dust is collected and removed from the inside of the blending mixer 103, and the blending accuracy of the raw material powder G may be significantly reduced.

  Therefore, instead of disposing the dust collectors 106 and 107 as in the raw material powder blending apparatus shown in FIG. 5, the weighing silo 102 and the blending mixer 103 are sealed, and the raw powder G is transferred from the raw powder storage silo 101 to the weighing silo 102. When the raw material powder G is supplied from the measuring silo 102 to the blending mixer 103, a raw material powder blending device is developed in which measures are taken to prevent the raw material powder G from scattering into the external space. Has reached.

JP 2007-145668 A

  However, when the measuring silo 102 and the mixing mixer 103 are sealed, when the raw material powder G is supplied from the raw material powder storage silo 101 to the measuring silo 102, the gas in the measuring silo 102 is compressed without escape. Therefore, when the raw material powder G is measured in the measuring silo 102 in this state, the weight is measured to be heavier by the amount of the compressed gas, which causes a measurement error. In addition, the pressure difference between the raw material powder storage silo 101 and the measuring silo 102 that causes the measurement error is gradually eliminated when a sufficient time elapses after the raw material powder G is supplied to the measuring silo 102. However, when waiting for the measurement of the raw material powder G until then, the working efficiency is extremely poor, which causes a practical problem.

  Further, when the measuring silo 102 and the mixing mixer 103 are sealed, when the raw material powder G is supplied from the measuring silo 102 to the mixing mixer 103, the atmospheric pressure in the measuring silo 102 from which the raw material powder G flows out is negative. Thus, the atmospheric pressure in the mixing mixer 103 into which the raw material powder G flows becomes a positive pressure. As a result, a force (airflow) for guiding the raw material powder G acts from the blending mixer 103 that becomes positive pressure toward the measuring silo 102 that becomes negative pressure, and smooth movement of the raw material powder G is hindered. That is, the time required for the preparation of the raw material powder G is unduly prolonged and the preparation work in a short time becomes difficult.

  When supplying the raw material powder G from the raw material powder storage silo 101 to the measuring silo 102, if the atmospheric pressure in the raw material powder storage silo 101 becomes negative and the atmospheric pressure in the measuring silo 102 becomes positive, the above For the same reason, the raw material powder G cannot be smoothly moved from the raw material powder storage silo 101 to the measuring silo 102. Therefore, even if such a situation arises, the time required for the preparation of the raw material powder G is unreasonably prolonged, resulting in the problem that the preparation work in a short time becomes difficult.

  Further, if the raw material powder G is not smoothly transferred from the measuring silo 102 to the blending mixer 103, even if the weight of the raw material powder G is accurately measured by the measuring silo 102, a part of the raw material powder G is added to the measuring silo 102. May remain, and the blending accuracy may decrease without reaching a predetermined blending ratio.

  In view of the above circumstances, an object of the present invention is to provide a raw material powder blending apparatus capable of accurately blending raw material powders in a short time.

  In order to solve the above problems, the present invention provides a raw material powder storage unit having a raw material powder storage space in order from the upstream side to the downstream side, and a measurement space for the raw material powder supplied from the raw material powder storage unit. And a raw material powder storage in a supply path for moving the raw material powder from the upstream side toward the downstream side. A raw material powder blending apparatus in which a space and a measuring space and a measuring space and a mixing space are connected to each other, wherein the raw material powder is moved from the raw material powder storage space to the measuring space through the supply path. A first pressure adjusting unit that adjusts a pressure difference between the raw material powder storage space and the measurement space, and when the raw material powder is moved from the measurement space to the preparation space through the supply path, Characterized in that a second pressure regulator for adjusting the pressure difference between the metering space and the preparation space.

  According to such a configuration, when the raw material powder is moved from the raw material powder storage space of the raw material powder storage unit to the measuring space of the measuring unit through the supply path, the pressure difference generated between the raw material powder storage space and the measuring space is reduced. It can be reduced as much as possible by the first pressure adjusting unit. Similarly, when the raw material powder is moved from the measurement space of the measurement unit to the preparation space of the preparation unit through the supply path, the pressure difference generated between the measurement space and the preparation space is made as much as possible by the second pressure adjustment unit. Can be reduced. Therefore, even if the weight of the raw material powder is measured by the measuring unit during or immediately after the raw material powder is supplied from the raw material powder storage space to the weighing space, the weight of the raw material powder is measured to be heavier than the original weight. You can solve problems such as. That is, it is possible to accurately measure the weight of the raw material powder without sufficiently lapse of time from the time when the raw material powder is supplied to the measuring space.

  Furthermore, when the raw material powder is moved from the upstream side to the downstream side between each of the raw material powder storage space, the metering space and the preparation space, there is substantially no pressure difference between the upstream space and the downstream space, The raw material powder can be moved smoothly.

  In the above configuration, the first pressure adjusting unit may be configured by an air passage that communicates the raw material powder storage space and the measurement space and allows gas to flow between the two spaces based on the pressure difference. Good.

  If it does in this way, gas can be distribute | circulated between the raw material powder storage space and the measurement space through the ventilation path which connects the raw material powder storage space and the measurement space. Therefore, when moving the raw material powder from the raw material powder storage space to the measurement space, even if the pressure in the raw material powder storage space becomes negative and the atmospheric pressure in the measurement space becomes positive, the measurement space is immediately passed through the ventilation passage. The gas flows into the raw material powder storage space, and the pressure difference generated between the raw material powder storage space and the metering space can be reduced as much as possible.

  Said structure WHEREIN: The said 2nd pressure adjustment part may be comprised from the ventilation path which connects the said measurement space and the said mixing space, and distribute | circulates gas between both spaces based on the pressure difference.

  If it does in this way, gas can be circulated between measurement space and preparation space through the vent way which connects measurement space and preparation space. Therefore, when moving the raw material powder from the measuring space to the mixing space, even if the pressure in the measuring space becomes negative and the pressure in the mixing space becomes positive, it is immediately measured from the mixing space through the air passage. Gas flows into the space. Therefore, the pressure difference generated between the weighing space and the blending space can be reduced as much as possible.

  In this case, the raw material powder storage space maintains an atmospheric pressure in a non-sealed state, and the first pressure adjusting unit causes the gas in the preparation space to pass through the air passage that forms the second pressure adjusting unit. And a dust collector that collects the dust discharged together with the gas from the exhaust port of the exhaust channel at a position separated from the exhaust port.

  That is, since the gas flows into the non-sealed raw material powder storage space from the external space, the pressure in the raw material powder storage space is negative even when the raw material powder is moved from the raw material powder storage space to the measurement space. Maintain atmospheric pressure without pressure. Therefore, when the raw material powder is moved from the raw material powder storage space to the measurement space and the atmospheric pressure in the measurement space becomes positive, the gas in the measurement space is discharged into the atmosphere, and the atmospheric pressure in the measurement space is changed to atmospheric pressure. Need to return. However, if the measurement space is communicated with the atmosphere in order to discharge the gas in the measurement space to the atmosphere, dust derived from the raw material powder will be scattered in the atmosphere. Therefore, as described above, by using the air passage that constitutes the second pressure adjustment unit as a part of the first pressure adjustment unit, first, the gas in the measurement space is released to the preparation space and Reduce atmospheric pressure to about atmospheric pressure. In this state, the pressure in the preparation space is positive due to the gas flowing in from the measurement space, so that the gas in the preparation space is discharged from the preparation space through the exhaust passage to the atmosphere, and the gas is discharged from the exhaust port of the exhaust passage. At the same time, the dust discharged is collected by a dust collector. Here, if the dust is sucked too much by the dust collector, the raw material powder in the preparation space (in some cases, the measuring space through the air passage constituting the second pressure adjusting unit) is forcibly sucked out, and the amount of the raw material powder May be unjustly reduced. Therefore, the dust collector is disposed at a position separated from the exhaust port of the exhaust path, and collects only dust that is naturally discharged from the exhaust port of the exhaust path.

  Said structure WHEREIN: The said raw material powder storage part, the said measurement part, and the said preparation part are arrange | positioned in order toward the downward direction from upper direction, and the said supply path moves the said raw material powder using the fall by dead weight. It is preferable.

  If it does in this way, raw material powder can be efficiently moved between each of raw material powder storage space, measurement space, and blending space using the force of gravity.

  Said structure WHEREIN: It is preferable that the said mixed powder is a molten glass raw material.

  In other words, since the blending ratio of the molten glass raw material also affects the physical characteristics of the glass product formed from the raw material, the blending ratio of the raw material powder is managed with high accuracy in the compounded powder used as the molten glass raw material. Need to be. In particular, in the glass substrate for FPD, such a necessity becomes more remarkable because various physical characteristics are required at a high level. In recent years, as represented by a glass substrate for FPD, various glass products are often required to produce a large number of products per unit time. Therefore, this invention which can manufacture the compounded powder prepared with high precision in a short time can be utilized suitably as a compounding apparatus of a molten glass raw material.

  As described above, according to the present invention, when the raw material powder is moved from the raw material powder storage space to the measurement space, or when the raw material powder is moved from the measurement space to the preparation space, the pressure difference between the spaces is made possible. Can be reduced. Therefore, the weight of the raw material powder can be accurately measured by the measuring unit, and the raw material powder can be smoothly moved between the raw material powder storage space, the measurement space, and the preparation space. Therefore, the raw material powder can be accurately prepared in a short time.

It is the schematic which shows the raw material powder preparation apparatus which concerns on 1st Embodiment of this invention. It is the schematic which shows the raw material powder preparation apparatus which concerns on 2nd Embodiment of this invention. It is the schematic which shows the raw material powder preparation apparatus which concerns on 3rd Embodiment of this invention. It is the schematic which shows an example of the conventional raw material powder preparation apparatus. It is the schematic which shows another example of the conventional raw material powder preparation apparatus.

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

  FIG. 1 is a schematic view showing a raw material powder blending apparatus according to a first embodiment of the present invention. The raw material powder blending apparatus includes a plurality of raw material powder storage silos 1. Each raw material powder storage silo 1 has a raw material powder storage space 1a for storing a raw material powder G such as silica sand used as one of glass raw materials. The raw material powder storage space 1a of each raw material powder storage silo 1 is sealed or substantially sealed so that the raw material powder G is not scattered into the external space. In the raw material powder storage space 1a of each raw material powder storage silo 1, different kinds of raw material powders G are stored.

  The lower part of each raw material powder storage silo 1 is reduced in a funnel shape, and the raw material powder G stored in each raw material powder storage space 1a is changed according to the operation of the raw material powder transfer device 2 attached to the lower end of each funnel. It is taken out. The raw material powder transfer device 2 may be a rotary feeder, an electromagnetic feeder, or the like. In this embodiment, the raw material powder transfer device 2 is composed of a screw feeder, and transfers the raw material powder G in a substantially horizontal direction.

  Each raw material powder transfer device 2 is connected to a first supply path 3 extending in the vertical direction and made of a flexible tube or the like, and the raw material powder G taken out from each raw material powder storage space 1a is supplied to the first supply passage 3 respectively. It moves downward in the road 3 due to falling by its own weight.

  A measuring silo 4 is connected to the lower end of each first supply path 3, and the raw material powder G is supplied from each first supply path 3 to the corresponding measuring space 4 a of the measuring silo 4. The measuring space 4a of each measuring silo 4 is sealed or substantially sealed so that the raw material powder G does not scatter into the external space. Each weighing silo 4 is supported via a weighing device (for example, a load cell) 4b, and the total weight of the weighing silo 4 combined with the weight of the contents is measured. Yes. Note that while the raw material powder G is measured by each measuring silo 4, the open / close valve 5 provided at the lower end of each measuring silo 4 is closed. In addition, the weighing device 4b can directly measure the weight of the contents contained in the weighing space 4a by adjusting the zero point of the measurement value when the weighing space 4a of the weighing silo 4 is empty.

  A second supply path 6 made of a flexible tube or the like is connected to the lower end of each measuring silo 4 through an opening / closing valve 5 and is connected to the lower end of the weighing silo 4. The raw material powder G weighed by each weighing silo 4 moves downward in the second supply path 6 due to falling by its own weight.

  A common mixing mixer 7 is connected to the lower end of each second supply path 6, and different raw material powder G supplied through each second supply path 6 is supplied to the mixing space 7 a of one mixing mixer 7. Is done. And the stirring apparatus 7b is arrange | positioned in the preparation space 7a, and the different raw material powder G supplied to the preparation space 7a is mixed and prepared over predetermined time. While the raw material powder G is mixed by the mixing mixer 7, the open / close valve 8 provided at the lower end of the mixing mixer 7 is closed.

  Below the blending mixer 7, a third supply path 9 extending in the vertical direction is connected via an opening / closing valve 8. With the opening / closing valve 8 of the blending mixer 7 being opened, the raw material powder G is supplied by the blending mixer 7. A mixed powder (also referred to as a batch) Gm prepared by mixing moves downward in the third supply path 9 due to its own weight.

  A blended powder storage silo 10 is connected to the lower end of the third supply path 9, and a blended powder produced by blending the raw powder G into the blended powder storage space 10 a in the blended powder storage silo 10 (both batches). Gm) is supplied. The mixed powder storage space 10a is sealed or substantially sealed so that the raw material powder G is not scattered in the external space.

  The lower part of the blended powder storage silo 10 has a funnel-like diameter, and the blended powder Gm stored in the blended powder storage space 10a is taken out in accordance with the operation of the blended powder transfer device 11 attached to the lower end thereof. The blended powder transfer device 11 may be a rotary feeder, an electromagnetic feeder, or the like. In this embodiment, the blended powder transfer device 11 is composed of a screw feeder, and transports the taken blended powder Gm in a substantially horizontal direction. .

  In this embodiment, the open / close valve 12 attached to the mixed powder transfer device 11 is opened, the mixed powder transfer device 11 is operated, and a bottle-shaped or bag-shaped temporary container disposed below the open / close valve 12 is operated. The mixed powder Gm is temporarily stored in the storage container 13, and the mixed powder Gm serving as a molten glass raw material is transported to the pre-furnace silo of the glass melting furnace (not shown) in the temporary storage container 13.

  And the raw material powder preparation apparatus concerning this embodiment is provided with the following 3 characteristic structures in addition to the above basic structures.

  First, in order to adjust the pressure difference generated between the raw material powder storage space 1a and the measuring space 4a when the raw material powder G is dropped and supplied from the raw material powder storage silo 1 to the measuring silo 4, the first pressure adjustment is performed. As a part, the 1st ventilation path 14 which connects between both space 1a, 4a is provided. The first air passage 14 is configured to circulate gas (for example, air) between the spaces 1a and 4a based on the pressure difference between the raw material powder storage space 1a and the measurement space 4a. In other words, the first air passage 14 connects the upper part of the raw material powder storage silo 1 and the upper part of the measuring silo 4 because it is necessary to circulate the gas while avoiding the raw material powder G.

  Thus, when the raw material powder G is dropped and supplied, the atmospheric pressure of the raw material powder storage space 1a becomes negative, and even if the atmospheric pressure of the measurement space 4a becomes positive, the measurement space 4a immediately passes through the first air passage 14. The compressed gas escapes to the raw material powder storage space 1a, and the pressure difference between the two spaces 1a and 4a is reduced as much as possible. Therefore, even when the raw material powder G is supplied from the raw material powder storage space 1a to the measuring space 4a or immediately after it, even if the weight of the raw material powder G is measured by the measuring device 4b, the raw material powder G is compressed by the compressed gas. Inconveniences such as being measured with a weight that is heavier than the original weight do not occur. That is, it is possible to accurately measure the weight of the raw material powder G without causing sufficient time from the time when the raw material powder G is supplied to the measuring space 4a.

  Moreover, since the pressure difference between the raw material powder storage space 1a and the measurement space 4a does not substantially occur, it is difficult to form an air flow that guides the raw material powder G from the measurement space 4a toward the raw material powder storage space 1a. Therefore, the raw material powder G can be smoothly moved from the raw material powder storage space 1a to the measurement space 4a.

  Secondly, in order to adjust the pressure difference generated between the measuring space 4a and the mixing space 7a when the raw material powder G is dropped and supplied from the measuring silo 4 to the mixing mixer 7, A second air passage 15 that communicates between the spaces 4a and 7a is provided. This 2nd ventilation path 15 distribute | circulates gas between both space 4a, 7a based on the pressure difference of the measurement space 4a and the mixing space 7a. The second air passage 15 also connects the upper portion of the measuring silo 4 and the upper portion of the blending mixer 7 for the same reason as the first air passage 14.

  As a result, when the raw material powder G is dropped and supplied, the pressure in the measurement space 4a becomes negative, and even if the pressure in the preparation space 7a becomes positive, the preparation space 7a is immediately compressed through the second air passage 15. The escaped gas escapes into the measuring space 4a, and the pressure difference between the two spaces 4a and 7a is reduced as much as possible. Therefore, the raw material powder G can be smoothly moved from the measurement space 4a to the preparation space 7a.

  Thirdly, in the present embodiment, since the blended powder storage silo 10 is arranged below the blending mixer 7, when the blended powder Gm is dropped and supplied from the blending mixer 7 to the blended powder storage silo 10, the blending space 7a. In order to adjust the pressure difference generated between the two and the mixed powder storage space 10a, a third air passage 16 communicating between the two spaces 7a and 10a is provided as a third pressure adjusting portion. In addition, the 3rd ventilation path 16 has also connected the upper part of the mixing mixer 7 and the upper part of the mixing powder storage silo 10 for the same reason as the 1st ventilation path 14.

  As a result, when the mixed powder Gm is dropped and supplied, the air pressure in the preparation space 7a becomes negative, and even if the air pressure in the preparation powder storage space 10a becomes positive, the preparation powder storage space immediately passes through the third air passage 16. The compressed gas 10a escapes to the preparation space 7a, and the pressure difference between the two spaces 7a and 10a is reduced as much as possible. Therefore, the raw material powder G can be smoothly moved from the preparation space 7a to the preparation powder storage space 10a.

  By providing the above three characteristic configurations, the weight of the raw material powder G can be accurately measured by the measuring silo 4, and the raw material powder storage space 1a, the measurement space 4a, the preparation space 7a, and the preparation powder can be measured. The raw material powder G or the mixed powder Gm can be smoothly moved between the storage spaces 10a. Therefore, the raw material powder G can be accurately prepared in a short time.

  In addition, the 1st ventilation path 14 and the 2nd ventilation path 15 are formed with the steel pipe whose internal diameter is about 50-100 mm, for example. On the other hand, the 3rd ventilation path 16 has a larger internal diameter than the 1st ventilation path 14 and the 2nd ventilation path 15, for example, is formed with the steel pipe whose internal diameter is about 150-200 mm. This is because it is necessary to quickly reduce the pressure difference between the preparation space 7a and the preparation powder storage space 10a because the preparation powder Gm is supplied from the preparation mixer 7 to the preparation powder storage silo 10 in a short time. is there.

  FIG. 2 is a schematic view showing a raw material powder blending apparatus according to a second embodiment of the present invention. The raw material powder preparation apparatus according to the second embodiment is different from the raw material powder preparation apparatus according to the first embodiment in that an intake passage 17 communicating with the atmosphere is provided in the preparation space 7a of the preparation mixer 7. .

  That is, when the mixed powder Gm is supplied from the mixed powder storage silo 10 to the temporary storage container 13 by the operation of the mixed powder transfer device 11, the gas in the mixed powder storage space 10a is also derived to the outside together with the mixed powder Gm. The pressure in the powder storage space 10a may be negative. And since the storage space 13a of the temporary storage container 13 is open | released to air | atmosphere, if the atmospheric | air pressure of the preparation powder storage space 10a becomes a negative pressure, the force which pushes back the raw material powder G from the storage space 13a to the preparation powder storage space 10a side. Act. For this reason, the mixed powder Gm may not be smoothly supplied to the temporary storage container 13, and the measurement space 4a and the preparation space 7a may also have negative pressure, which may affect the measurement value. Therefore, in the second embodiment, when supplying the mixed powder Gm to the temporary storage container 13, outside air is introduced into the mixed powder storage space 10a through the intake passage 17 so as to maintain the prepared powder storage space 10a at atmospheric pressure. I have to.

  In addition, the third ventilation path 16 and the intake path 17 are provided with opening and closing valves 18 and 19, respectively. When the third ventilation path 16 is open, the intake path 17 is closed, and when the intake path 17 is open. The third air passage 16 is closed. Specifically, when supplying the mixed powder Gm to the mixed powder storage space 10 a, the third ventilation path 16 is opened by the opening / closing valve 18 with the intake path 17 closed by the opening / closing valve 19, and the temporary storage container 13 is opened. When supplying the mixed powder Gm, the intake passage 17 is opened by the opening / closing valve 19 with the third ventilation passage 16 closed by the opening / closing valve 18.

  In this embodiment, a part of the third air passage 16 and the intake passage 17 is constituted by a common passage, and the passage extending from the mixed powder storage space 10a branches into two in the middle, and the branch point The one branch passage communicates with the raw material powder storage space 1a to form the third ventilation passage 16, and the other branch passage communicates with the atmosphere to form the intake passage 17.

  FIG. 3 is a schematic view showing a raw material powder blending apparatus according to a third embodiment of the present invention. The raw material powder storage device according to the third embodiment is different from the raw material powder storage device according to the first and second embodiments in that part or all of the raw material powder storage silo 1 for storing the raw material powder G (illustrated example). Then, 1) is changed to a cloth bag {for example, flexible container bag (flexible container)} 20 containing the raw material powder G inside.

  Specifically, the cloth bag 20 containing the raw material powder G can be opened and closed at the bottom, and is disposed in a funnel-shaped receiving base 21 connected to the raw material powder transfer device 2 with the bottom open. . Since the cloth bag 20 is not sealed with the bottom open, the interior of the cloth bag 20 is maintained at atmospheric pressure. Therefore, when the raw material powder G is dropped and supplied from the cloth bag 20 to the measuring silo 4, the pressure in the measuring space 4a is maintained at atmospheric pressure so as to reduce the pressure difference between the inside of the cloth bag 20 and the measuring space 4a. There is a need. Therefore, an exhaust path 22 is provided in the blending space 7a of the blending mixer 7 in a state where the metering space 4a of the metering silo 4 and the blending space 7a of the blending mixer 7 are in communication with each other through the second air passage 15. The gas in the preparation space 7a is exhausted to the atmosphere. That is, the second ventilation path 15 constituting the second pressure adjustment section is used in combination as a part of the first pressure adjustment section, and by this second ventilation path 15, the gas in the measurement space 4a is first released to the preparation space 7a, The atmospheric pressure in the measurement space 4a is reduced to about atmospheric pressure. In this state, the pressure in the preparation space 7a becomes positive due to the gas flowing in from the metering space 4a. Therefore, the exhaust path is discharged from the preparation space 7a through the exhaust path 22 to the atmosphere. The dust discharged together with the gas from the exhaust port 22 is collected by the dust collector 23.

  Further, when the gas in the preparation space 7a is discharged from the exhaust path 22, the raw material powder G may be scattered in the atmosphere together with the discharged gas. Therefore, a dust collector 23 is provided at a position away from the exhaust port of the exhaust path 22 to collect dust discharged together with gas from the exhaust port of the exhaust path 22. The reason for disposing the dust collector 23 away from the exhaust port of the exhaust path 22 is to collect only dust that is naturally discharged from the exhaust port of the exhaust path 22. In other words, the dust collector 23 actively sucks out the raw material powder G in the measurement space 4a or the blending space 7a to prevent the amount of the raw material powder G from being unduly reduced.

  The exhaust passage 22 may be provided in the measurement space 4a of the measurement silo 4. In this case, the first pressure adjusting unit is configured by the exhaust path 22 and the dust collector 23.

  In addition, this invention is not limited to the said embodiment, It can implement with a various form. For example, in the above embodiment, the case where the raw material powder storage silo 1 (Flecon 20), the measuring silo 4, the mixing mixer 7, and the mixed powder storage silo 10 are arranged in the vertical direction from the top is described. 1 (flexible container 20), measuring silo 4, blending mixer 7, and blended powder storage silo 10 may be arranged in the horizontal direction and blended while sequentially conveying the raw material powder G in the horizontal direction.

  Moreover, although the said embodiment demonstrated the case where the preparation powder storage silo 10 which stores the preparation powder Gm manufactured with the preparation mixer 7 was provided, the preparation powder storage silo 10 was abbreviate | omitted and it was temporarily set from the preparation mixer 7. The prepared powder Gm may be supplied directly to the container 13.

  In the above embodiment, the case where the prepared mixed powder Gm is once stored in the temporary storage container 13 and then supplied to the pre-furnace silo of the glass melting furnace has been described, but from the mixing mixer 7 or the mixed powder storage silo 10. The mixed powder Gm may be directly supplied to the pre-silo of the glass melting furnace through piping or the like.

  Moreover, in said embodiment, although the glass raw material was used as the raw material powder G, you may use another powder (For example, food powder raw materials, such as wheat flour, and a chemical product).

DESCRIPTION OF SYMBOLS 1 Raw material powder storage silo 1a Raw material powder storage space 2 Raw material powder transfer apparatus 3 1st supply path 4 Weighing silo 4a Measuring space 4b Weighing apparatus 6 2nd supply path 7 Preparation mixer 7a Preparation space 7b Stirrer 9 Third supply path 10 Preparation Powder storage silo 10a Compound powder storage space 11 Compound powder transfer device 12 Open / close valve 13 Temporary storage container 13a Storage space 14 First air passage 15 Second air passage 16 Third air passage 17 Air intake passage 20 Cloth bag (flexible container)
21 Receiving base 22 Exhaust passage 23 Dust collector G Raw material powder Gm Preparation

Claims (6)

In order from the upstream side to the downstream side, the raw material powder storage unit having a raw material powder storage space, the weighing unit having a measurement space for the raw material powder supplied from the raw material powder storage unit, and the weighing unit weighed A feed section for moving the raw material powder from the upstream side toward the downstream side, between the raw material powder storage space and the measurement space, and between the measurement space and the mixing device. It is a raw material powder blending device that connects each space,
A first pressure adjusting unit that adjusts a pressure difference between the raw material powder storage space and the measurement space when the raw material powder is moved from the raw material powder storage space to the measurement space through the supply path; A raw material powder blending apparatus comprising: a second pressure adjusting unit that adjusts a pressure difference between the measurement space and the blending space when the raw material powder is moved to the blending space through the supply path. .   The first pressure adjusting unit is configured by an air passage that communicates the raw material powder storage space and the measurement space and allows gas to flow between the two spaces based on the pressure difference. Item 2. The raw material powder blending apparatus according to Item 1.   The said 2nd pressure adjustment part is comprised from the ventilation path which connects the said measurement space and the said mixing space, and distribute | circulates gas between both spaces based on the pressure difference. Or the raw material powder preparation apparatus of 2. The raw material powder storage space maintains atmospheric pressure in an unsealed state,
The first pressure adjusting unit includes the ventilation path constituting the second pressure adjusting unit, an exhaust path for exhausting the gas in the preparation space to the atmosphere, and dust discharged together with the gas from the exhaust port of the exhaust path. The raw material powder blending apparatus according to claim 3, comprising: a dust collector that collects the gas at a position spaced apart from the exhaust port.   The raw material powder storage unit, the weighing unit, and the blending unit are arranged in order from the upper side to the lower side, and the supply path moves the raw material powder by using a fall due to its own weight. The raw material powder preparation apparatus of any one of Claims 1-4.   6. The raw material powder preparation apparatus according to claim 1, wherein the preparation powder is a molten glass raw material.

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