Glass raw material manufacturing device

Abstract

The utility model provides a glass raw material manufacturing device capable of inhibiting scattering of glass raw materials during carrying. A glass raw material manufacturing device (1) is provided with: a discharge pipe (6a) having an opening (6c) through which a glass raw material (Ga) is dropped and introduced; a belt conveyor (7) that transports the glass raw material (Ga) introduced from the discharge pipe (6a) in a predetermined transport direction (X); a surrounding member (9a) that surrounds the portion where the glass raw material (Ga) fed from the discharge tube (6a) falls; and a housing (10) that accommodates the belt conveyor (7) and the surrounding member (9a).

Description

Technical Field

[0001] The utility model relates to a manufacturing device for glass raw materials. Background Art

[0002] Various glass products such as glass substrates used in displays such as liquid crystal displays are manufactured by heating glass raw materials in a melting furnace to generate molten glass and then shaping the molten glass into a predetermined shape.

[0003] Glass raw materials are composed of mixed powder (batch) obtained by mixing a plurality of raw material powders at a predetermined mixing ratio.

[0004] As an apparatus for manufacturing such blended powder, there is the following apparatus, which comprises: a raw material powder storage silo storing raw material powder, a measuring silo measuring the raw material powder supplied from the raw material powder storage silo, and a blending mixer blending the raw material powder measured by the measuring silo (for example, refer to paragraphs 0030 to 0035 of Patent Document 1).

[0005] In the glass raw material manufacturing device, the blender is arranged below the measuring silo. The measuring silo and the blender are connected by a supply path. The raw material powder measured by the measuring silo is supplied to the blender via the supply path (see paragraphs 0034 and 0035 of Patent Document 1).

[0006] [Prior technical literature]

[0007] [Patent Literature]

[0008] Patent Document 1: Japanese Patent Application Publication No. 2012-25627 Utility Model Content

[0009] Issues to be solved by utility models

[0010] In the above-described conventional glass raw material manufacturing apparatus, the raw material powder measured out from the measuring silo is conveyed to the mixing and kneading machine through the supply path by the action of gravity.

[0011] As another configuration, the glass raw materials may be transported to the blending mixer by a conveying device such as a belt conveyor instead of the above-mentioned supply path. In this case, when the glass raw materials measured from the measuring silo are placed on the belt of the conveying device, the glass raw materials may scatter and leak out of the conveying device. When the glass raw materials leak out, it is difficult to blend them with good accuracy.

[0012] The present invention has been made in view of the above circumstances, and a technical object is to suppress scattering of glass raw materials during transportation.

[0013] Solutions to Solve Problems

[0014] (1) The present invention is made to solve the above-mentioned problems. A glass raw material manufacturing device includes a discharge pipe for dropping glass raw material, a belt conveyor for conveying the glass raw material dropped from the discharge pipe in a predetermined conveying direction, and a housing for accommodating the belt conveyor. The glass raw material manufacturing device is characterized in that the glass raw material manufacturing device includes a surrounding member, which is accommodated in the housing and surrounds a portion where the glass raw material dropped from the discharge pipe falls.

[0015] According to this configuration, by providing a surrounding member at the location where the glass raw materials dropped from the discharge pipe fall, scattering of the glass raw materials falling onto the belt conveyor can be effectively suppressed. Therefore, the glass raw materials conveyed by the belt conveyor can be blended with high accuracy.

[0016] (2) In the glass raw material manufacturing device described in (1) above, the surrounding member may also have a ceiling portion, a side wall portion extending downward from an end portion of the ceiling portion in the width direction of the belt conveyor, and an opening portion provided on the end side of the ceiling portion in the conveying direction.

[0017] According to this configuration, scattering of the glass-making raw materials that have fallen onto the belt conveyor can be suppressed by the ceiling portion and the side wall portions, and the glass-making raw materials can be appropriately conveyed in the conveying direction through the opening portion.

[0018] (3) In the glass raw material manufacturing device described in (1) or (2) above, the discharge pipe may include a first discharge pipe into which a larger amount of the glass raw material is fed, and a second discharge pipe into which a smaller amount of the glass raw material is fed, and the surrounding member may include a first surrounding member corresponding to the first discharge pipe, and a second surrounding member corresponding to the second discharge pipe, wherein the second surrounding member is smaller than the first surrounding member.

[0019] According to this configuration, by determining the size of the surrounding member according to the amount of glass raw material input, the structure of the manufacturing apparatus can be simplified and the equipment cost can be reduced.

[0020] (4) In the glass raw material manufacturing device described in any one of (1) to (3) above, the glass raw material manufacturing device may include a partition portion that prevents the glass raw material from leaking out from the end portion in the width direction of the belt conveyor, and the partition portion includes a first partition portion provided on the side of one end portion of the belt conveyor in the width direction, and a second partition portion provided on the side of the other end portion of the belt conveyor in the width direction.

[0021] According to this configuration, the glass-making raw materials can be prevented from leaking to the outside of the belt conveyor by the partitioning portion, and the glass-making raw materials after conveyance can be mixed with high accuracy.

[0022] (5) In the manufacturing apparatus of glass raw material described in (4) above, the surrounding member may be arranged between the first partition part and the second partition part.

[0023] According to this configuration, the surrounding member and the partitioning portion prevent the glass-making raw materials conveyed by the belt conveyor from scattering or leaking, thereby making it possible to more accurately mix the conveyed glass-making raw materials.

[0024] (6) In the glass raw material manufacturing apparatus described in any one of (1) to (5) above, the belt conveyor may include a conveying surface for receiving the glass raw material introduced from the discharge pipe, and the cross-sectional shape of the conveying surface may be concave.

[0025] According to this configuration, by configuring the conveying surface of the belt conveyor to be concave, it is possible to suppress the glass-making feedstock on the conveying surface from leaking out from the belt conveyor.

[0026] Utility Model Effect

[0027] According to the present invention, scattering of glass raw materials during transportation can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a side cross-sectional view showing an apparatus for producing glass raw material.

[0029] Figure 2 yes Figure 1 The cross-sectional view involved in the II-II line of sight.

[0030] Figure 3 It is a perspective view showing a discharge pipe and surrounding members.

[0031] Figure 4 It is a flowchart showing a method for manufacturing a glass article.

[0032] Figure 5 It is a flowchart showing the blending process.

[0033] Description of reference numerals:

[0034] 1 Glass raw material manufacturing device

[0035] 6a First discharge pipe

[0036] 6b Second discharge pipe

[0037] 7 Belt conveyor

[0038] 8a First partition

[0039] 8b Second partition

[0040] 9a First enclosing member

[0041] 9b Second enclosing member

[0042] 10. Housing

[0043] 11a Transport surface

[0044] 15 Ceiling part of the surrounding structure

[0045] 16a First side wall portion of the surrounding member

[0046] 16b Second side wall portion of the surrounding member

[0047] 17a Upstream opening of the surrounding member

[0048] 17b Downstream opening of the surrounding member

[0049] Ga First glass raw material

[0050] Gb Second glass raw material

[0051] S12 Transportation process

[0052] W Width direction of belt conveyor

[0053] X Transport direction. DETAILED DESCRIPTION

[0054] Hereinafter, the present specific embodiment will be described with reference to the drawings. Figures 1 to 5 One embodiment of the manufacturing apparatus of the glass raw material which concerns on this invention is shown.

[0055] like Figure 1 and Figure 2 As shown, the glass raw material manufacturing apparatus 1 mainly includes supply devices 2a and 2b for supplying powdered glass raw materials Ga and Gb, and a conveying device 3 for conveying the glass raw materials Ga and Gb supplied from the supply devices 2a and 2b in a predetermined conveying direction X.

[0056] The supply devices 2a and 2b include a first supply device 2a for supplying a first glass raw material Ga, and a second supply device 2b for supplying a second glass raw material Gb. In the present embodiment, the supply amount of the first glass raw material Ga supplied by the first supply device 2a is set to be greater than the supply amount of the second glass raw material Gb supplied by the second supply device 2b, but the setting of the supply amounts of the glass raw materials Ga and Gb is not limited to the present embodiment.

[0057] The supply devices 2 a and 2 b include a hopper 4 , a feeder 5 connected to the hopper 4 , and discharge pipes 6 a and 6 b connected to the feeder 5 .

[0058] The hopper 4 guides glass raw materials Ga and Gb of a predetermined weight supplied from a silo (not shown) to the feeder 5. The hopper 4 is connected to one end of the feeder 5.

[0059] The feeder 5 transfers the glass raw materials Ga and Gb supplied from the hopper 4 to the discharge pipes 6a and 6b. The feeder 5 is constituted by, for example, a vibration feeder, but is not limited to this structure, and may be constituted by a screw feeder, a belt conveyor, or the like.

[0060] The discharge pipes 6a and 6b include a first discharge pipe 6a provided in the first supply device 2a, and a second discharge pipe 6b provided in the second supply device 2b. Each discharge pipe 6a and 6b is configured as a tube extending in the vertical direction, but is not limited to this structure. The tube diameter (inner diameter) D1 of the first discharge pipe 6a is larger than the tube diameter (inner diameter) D2 of the second discharge pipe 6b. Thus, the amount of the first glass raw material Ga fed into the first discharge pipe 6a per unit time can be greater than the amount of the second glass raw material Gb fed into the second discharge pipe 6b per unit time.

[0061] The discharge pipes 6a and 6b are connected to the other end of the feeder 5. The discharge pipes 6a and 6b have an opening 6c for causing the glass raw materials Ga and Gb transferred by the feeder 5 to fall downward and be thrown into the conveying device 3. The upper ends of the discharge pipes 6a and 6b are connected to the feeder 5, and the lower ends of the discharge pipes 6a and 6b are fixed to the upper part of the conveying device 3.

[0062] The conveying device 3 includes a belt conveyor 7 for conveying glass raw materials Ga and Gb introduced from discharge pipes 6a and 6b along a conveying direction X, partitions 8a and 8b for preventing the glass raw materials Ga and Gb from leaking to the outside from the ends of the belt conveyor 7 in the width direction W (horizontal direction perpendicular to the conveying direction X), surrounding components 9a and 9b arranged near the discharge pipes 6a and 6b, and a shell 10 for accommodating the belt conveyor 7, the partitions 8a and 8b and the surrounding components 9a and 9b.

[0063] The belt conveyor 7 includes a belt 11 configured in an endless belt shape and a plurality of rollers 12 to 14 that support the belt 11 .

[0064] The belt 11 is configured to transport the glass raw materials Ga and Gb along its longitudinal direction, that is, the transport direction X, by a driving device (not shown). The belt 11 has a transport surface 11a, and the transport surface 11a receives the glass raw materials Ga and Gb introduced from the openings 6c of the discharge pipes 6a and 6b. Figure 2As shown in FIG. 1 , the cross-sectional shape of the conveying surface 11 a is formed into a concave shape. That is, the center portion of the conveying surface 11 a in the width direction W is located at a position lower than the end portions of the conveying surface 11 a in the width direction W.

[0065] like Figure 2 As shown, the rollers 12 to 14 include a first roller 12, a second roller 13, and a third roller 14 arranged along the width direction W of the belt 11. The first roller 12 supports the lower surface of the central portion of the belt 11 in the width direction W. The second roller 13 supports the lower surface of one end portion of the belt 11 in the width direction W. The third roller 14 supports the lower surface of the other end portion of the belt 11 in the width direction W.

[0066] The first roller 12 is arranged so that its rotation axis is along the width direction W (horizontal direction) of the belt 11. The second roller 13 and the third roller 14 are arranged so that their rotation axes are inclined with respect to the width direction W (horizontal direction) of the belt 11. The second roller 13 and the third roller 14 support the belt 11 in an inclined state, thereby making the conveying surface 11a of the belt 11 concave.

[0067] like Figure 2 As shown, the partitions 8 a and 8 b include a first partition 8 a provided at one end side in the width direction W of the belt conveyor 7 , and a second partition 8 b provided at the other end side in the width direction W of the belt conveyor 7 .

[0068] Each partition 8a, 8b is made of an elastic member such as rubber, but the material of each partition 8a, 8b is not limited to the present embodiment. The upper end of each partition 8a, 8b is fixed to the housing 10 by a fixing member 8c. The lower end of the partition 8a, 8b contacts the conveying surface 11a of the belt 11 in the belt conveyor 7 with elastic deformation.

[0069] Each of the partitions 8a and 8b is formed in an elongated shape along the conveying direction X. The partitions 8a and 8b extend along the length direction of the belt 11 in the belt conveyor 7. With this structure, a space (conveying space) for conveying the glass raw materials Ga and Gb is formed between the first partition 8a and the second partition 8b.

[0070] The surrounding members 9a and 9b are used to suppress the scattering of the glass raw materials Ga and Gb when the glass raw materials Ga and Gb thrown into the belt 11 from the discharge pipes 6a and 6b collide with the belt 11. The surrounding members 9a and 9b are made of metal or resin, but are not limited to these materials. The surrounding members 9a and 9b surround the part where the glass raw materials Ga and Gb thrown in from the opening 6c of the discharge pipes 6a and 6b fall. The surrounding members 9a and 9b are arranged between the first partition 8a and the second partition 8b.

[0071] The surrounding members 9a and 9b include a first surrounding member 9a provided at the first discharge pipe 6a, and a second surrounding member 9b provided at the second discharge pipe 6b. Figures 1 to 3 As shown, the surrounding members 9a, 9b have a ceiling portion 15, side wall portions 16a, 16b extending downward from the end portion of the ceiling portion 15 in the width direction W of the belt conveyor 7, and opening portions 17a, 17b provided on the end side of the ceiling portion 15 in the conveying direction X.

[0072] The sizes of the surrounding members 9a and 9b are determined according to the input amount of the glass raw materials Ga and Gb input from the respective discharge pipes 6a and 6b per unit time, and are configured so that the surrounding members 9a and 9b become smaller as the input amount per unit time decreases. In the present embodiment, the input amount of the second glass raw material Gb input from the second discharge pipe 6b is smaller than the input amount of the first glass raw material Ga input from the first discharge pipe 6a, and therefore the second surrounding member 9b is configured to be smaller than the first surrounding member 9a.

[0073] Specifically, the length dimension L2 of the side walls 16a, 16b of the second enclosure member 9b in the conveying direction X is smaller than the length dimension L1 of the side walls 16a, 16b of the first enclosure member 9a in the conveying direction X. It should be noted that the dimension W2 of the ceiling 15 of the second enclosure member 9b in the width direction W is equal to the dimension W1 of the ceiling 15 of the first enclosure member 9a in the width direction W.

[0074] The ceiling 15 is a plate-shaped portion extending in the horizontal direction. The ceiling 15 is fixed to the housing 10. The ceiling 15 has a through hole 15a through which the glass raw materials Ga and Gb falling through the discharge pipes 6a and 6b pass. The ceiling 15 is connected to the lower end of the discharge pipes 6a and 6b in such a manner that the through hole 15a coincides with the opening 6c of the discharge pipes 6a and 6b.

[0075] The side wall portions 16a, 16b include a first side wall portion 16a protruding downward from one end portion of the ceiling portion 15 in the width direction W, and a second side wall portion 16bc protruding downward from the other end portion of the ceiling portion 15 in the width direction W. The first side wall portion 16a and the second side wall portion 16b are located at positions separated in the width direction W and are opposite to each other.

[0076] The length dimensions L1 and L2 of the side walls 16a and 16b in the conveying direction X are preferably 1.1 to 5 times the diameters D1 and D2 of the corresponding discharge pipes 6a and 6b, and more preferably 1.1 to 3 times the diameters D1 and D2 of the corresponding discharge pipes 6a and 6b.

[0077] The lower end of each side wall portion 16a, 16b does not contact the conveying surface 11a of the belt 11 in the belt conveyor 7. The interval between the lower end of each side wall portion 16a, 16b and the conveying surface 11a is preferably 30 mm or more and 90 mm or less, for example. Thus, it is possible to prevent each side wall portion 16a, 16b and the conveying surface 11a from being worn due to contact therebetween.

[0078] The openings 17a and 17b of the surrounding members 9a and 9b include an upstream opening 17a provided upstream in the conveying direction X and a downstream opening 17b provided downstream in the conveying direction X. The openings 17a and 17b of the second surrounding member 9b are smaller than the openings 17a and 17b of the first surrounding member 9a.

[0079] The housing 10 includes an upper wall portion 10a supporting the discharge pipes 6a and 6b, a pair of side walls 10b and 10c extending downward from ends of the upper wall portion 10a in the width direction W, and a lower wall portion 10d connecting lower ends of the pair of side walls 10b and 10c.

[0080] The upper wall 10a of the housing 10 supports the ceiling 15 of the surrounding members 9a and 9b. The ceiling 15 of the surrounding members 9a and 9b is fixed to the inner surface of the upper wall 10a by fixing members such as bolts. The upper wall 10a has a through hole 10a1 through which the lower end of the discharge pipe 6a and 6b passes.

[0081] The side wall portions 10b and 10c of the housing 10 include a first side wall portion 10b located on one end side of the belt 11 in the width direction W, and a second side wall portion 10c located on the other end side of the belt 11 in the width direction W. The first side wall portion 10b is located outside the first partition portion 8a and covers the first partition portion 8a. The second side wall portion 10c is located outside the second partition portion 8b and covers the second partition portion 8b.

[0082] The lower wall portion 10d of the housing 10 connects the lower end of the first side wall portion 10b and the lower end of the second side wall portion 10c. The lower wall portion 10d is located below the belt conveyor 7 and covers the belt conveyor 7.

[0083] Hereinafter, a method for producing mixed glass raw materials obtained by mixing first glass raw materials Ga and second glass raw materials Gb using the above-described production apparatus 1 and a method for producing a glass article using the mixed glass raw materials will be described.

[0084] like Figure 4 As shown, the method for producing a glass article mainly includes a mixing step S1 , a melting step S2 , and a forming step S3 .

[0085] The blending step S1 is a step of manufacturing a mixed glass raw material using the manufacturing apparatus 1. Figure 5 As shown, the preparation step S1 includes a charging step S11 , a conveying step S12 , a mixing step S13 , and a filling step S14 .

[0086] In the charging process S11, the first glass raw material Ga is supplied from the first supply device 2a to the conveying device 3, and the second glass raw material Gb is supplied from the second supply device 2b to the conveying device 3. In the charging process S11, each glass raw material Ga and Gb is supplied from the silo to the hopper 4. A measuring device is provided on the path from the silo to the hopper 4. Therefore, the glass raw materials Ga and Gb of a predetermined weight measured are supplied to the hopper 4. As the glass raw materials Ga and Gb, for example, silica sand, limestone, soda ash, cullet, etc. can be used.

[0087] After that, each glass raw material Ga, Gb is transferred from the hopper 4 to the feeder 5 and the discharge pipes 6a, 6b. Furthermore, the glass raw materials Ga, Gb fall from the openings 6c of the discharge pipes 6a, 6b to the belt conveyor 7 of the transport device 3.

[0088] More specifically, the glass raw materials Ga and Gb that have passed through the openings 6c of the discharge pipes 6a and 6b pass through the through holes 15a of the ceiling 15 of the surrounding members 9a and 9b, and fall onto the conveying surface 11a of the belt 11 of the belt conveyor 7. At this time, the glass raw materials Ga and Gb tend to scatter due to collision with the conveying surface 11a, but the scattering can be suppressed as much as possible by the ceiling 15 and the side wall portions 16a and 16b of the surrounding members 9a and 9b.

[0089] In the conveying step S12, the glass raw materials Ga and Gb are conveyed by the conveying device 3. The conveying device 3 continuously drives the belt 11 to convey the glass raw materials Ga and Gb placed on the conveying surface 11a to the downstream side in the conveying direction X.

[0090] In the mixing step S13, the glass raw materials Ga and Gb are mixed by a mixing device (mixer) disposed downstream of the conveying device 3 in the conveying direction X. Thus, mixed glass raw materials in which the first glass raw material Ga and the second glass raw material Gb are mixed are produced.

[0091] In the filling step S14, the mixed glass raw material produced in the mixing step S13 is filled into the container. The container filled with the mixed glass raw material is transferred to the melting step S2.

[0092] In the melting step S2, the mixed glass raw material filled in the container is taken out and supplied to a melting furnace that performs the melting step S2. The melting furnace includes a feeder that transfers the mixed glass raw material and a melting tank that melts the mixed glass raw material.

[0093] In the melting step S2, the mixed glass raw material is transferred by a feeder and supplied to a melting tank. The melting tank generates molten glass by heating the mixed glass raw material. The molten glass generated in the melting tank is transferred to the forming step S3 through a predetermined transfer path (transfer step).

[0094] The transfer path is provided with a clarification tank, a stirring tank, a state adjustment tank, etc. After the molten glass is degassed in the clarification tank, it is stirred in the stirring tank to be homogenized. After that, the molten glass is adjusted in the state adjustment tank for viscosity and the like, and is supplied to the forming step S3.

[0095] In the forming step S3, the molten glass is formed by a forming device that performs, for example, an overflow down-draw method. The forming device includes a forming body that can form a glass ribbon as a glass article from the molten glass.

[0096] In the forming step S3, molten glass flows into an overflow channel provided at the upper portion of a forming body having a substantially wedge-shaped cross section, and the molten glass overflowing from the overflow channel flows down along the side surfaces of both sides of the forming body while being fused and integrated at the lower end of the forming body, thereby continuously forming a glass ribbon.

[0097] Next, the glass ribbon is cooled through an annealing process and a cooling process. After that, the glass ribbon may be cut through, for example, a first cutting process. Thus, a single-piece glass plate is formed. The glass plate is manufactured through a second cutting process, an end surface processing process, a cleaning process, an inspection process, etc. The glass plate as a glass article manufactured in this way is suitable for use as a glass substrate for a display such as a liquid crystal display. Not limited to this, the glass ribbon may be wound into a roll without being cut. Thus, a glass roll as a glass article is manufactured.

[0098] According to the manufacturing apparatus 1 of glass raw materials according to the present embodiment described above, by providing the surrounding members 9a and 9b at the portion where the glass raw materials Ga and Gb fall from the openings 6c of the discharge pipes 6a and 6b of the manufacturing apparatus 1, it is possible to suppress as much as possible the scattering of the glass raw materials Ga and Gb when they fall on the conveying surface 11a of the belt conveyor 7. Thus, the mixed glass raw materials can be manufactured with high accuracy, and high-quality glass products can be manufactured.

[0099] It should be noted that the present invention is not limited to the configuration of the above-described embodiment, nor is it limited to the above-described effects. The present invention can be modified in various ways without departing from the gist of the present invention.

[0100] In the above-mentioned embodiment, the lower ends of the side walls 16a and 16b of the surrounding members 9a and 9b are separated from the conveying surface 11a of the belt conveyor 7, but the present invention is not limited to this structure. For example, the side walls 16a and 16b of the surrounding members 9a and 9b may be formed of elastic members such as rubber, and the lower ends of the side walls 16a and 16b may be in contact with the conveying surface 11a in an elastically deformed state.

[0101] In the above-mentioned embodiment, the manufacturing apparatus 1 of glass raw material provided with two supply devices 2a and 2b is illustrated, but this invention is not limited to this structure. The manufacturing apparatus 1 may be provided with one or three or more supply devices.

[0102] In the above embodiment, the manufacturing apparatus 1 is exemplified in which the conveying surface 11a of the belt conveyor 7 in the conveying device 3 is configured in a concave shape, but the present invention is not limited to this structure. The conveying surface 11a of the belt conveyor 7 may be configured in a flat surface shape.

[0103] In the above-mentioned embodiment, the enclosure members 9a and 9b are provided with the ceiling 15 and the pair of side walls 16a and 16b, but the present invention is not limited to this structure. For example, the ceiling 15 may be omitted, and the upper ends of the side walls 16a and 16b may be fixed to the upper wall 10a of the housing 10 to form the enclosure members 9a and 9b.

Claims

1. A glass raw material manufacturing device, comprising a discharge pipe for dropping glass raw material into the glass raw material, a belt conveyor for conveying the glass raw material introduced from the discharge pipe in a predetermined conveying direction, and a housing for accommodating the belt conveyor, characterized in that: The manufacturing apparatus of the glass-making raw material includes a surrounding member which is accommodated in the housing and surrounds a portion where the glass-making raw material thrown in from the discharge pipe falls.

2. The glass raw material manufacturing device according to claim 1, characterized in that: The enclosure member includes a ceiling portion, a side wall portion extending downward from an end portion of the ceiling portion in the width direction of the belt conveyor, and an opening portion provided on an end portion side of the ceiling portion in the conveying direction.

3. The manufacturing device of glass raw material according to claim 1 or 2, characterized in that: The discharge pipe includes a first discharge pipe into which a large amount of glass raw materials are input, and a second discharge pipe into which a small amount of glass raw materials are input. The surrounding member includes a first surrounding member corresponding to the first discharge pipe and a second surrounding member corresponding to the second discharge pipe. The second surrounding member is smaller than the first surrounding member.

4. The manufacturing device of glass raw material according to claim 1 or 2, characterized in that: The manufacturing device of the glass raw material includes a partition portion that prevents the glass raw material from leaking to the outside from the end portion in the width direction of the belt conveyor. The partitioning portion includes a first partitioning portion provided on one end side of the belt conveyor in the width direction, and a second partitioning portion provided on the other end side of the belt conveyor in the width direction.

5. The manufacturing device of glass raw material according to claim 4, characterized in that: The surrounding member is arranged between the first partition portion and the second partition portion.

6. The manufacturing device of glass raw material according to claim 1 or 2, characterized in that: The belt conveyor has a conveying surface for receiving the glass raw material introduced from the discharge pipe. The cross-sectional shape of the conveying surface is concave.

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