JP2007031199A - Equipment and method for manufacturing glass tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass tube manufacturing equipment capable of securely cutting the glass tube even in case that a drawing speed is increased so as to improve the production efficiency and reducing a cut loss. <P>SOLUTION: The glass tube manufacturing equipment 2 is equipped with a drawing device 10 for drawing a tubular glass G, a rough cutter 11 for obtaining a primary glass tube G1' by roughly cutting the tubular glass G, a splitting device 22 for obtaining a secondary glass tube G1 by splitting the glass tube G1' to have a length almost the same as that of a glass tube G2, a re-cutting and edge-baking device 13 for obtaining a finished glass tube G2 by re-cutting the glass tube G1 to have a specified length and baking cut edges, and a conveyor 24 for conveying the secondary glass tube G1 and the finished glass tube G2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a glass tube manufacturing facility and a glass tube manufacturing method.

  Tubular glass is a dunner method in which glass dough drawn from a glass melting furnace is wrapped around a long cylindrical refractory called a sleeve, and air is fed from the back of the sleeve to form a hollow tube, or a glass melting furnace The glass dough drawn out from the glass is extruded downward, and air is introduced from above to form a hollow tube.

  Conventionally, the tubular glass G is processed into a glass tube G2 by a glass tube manufacturing facility 1 as shown in FIG. This glass tube manufacturing equipment 1 includes a tube drawing device 10 that pulls the tubular glass G, a rough cutting device 11 that roughly cuts the tubular glass G to obtain a glass parent tube G1, and a glass parent tube G1 cut into a predetermined length. It includes a re-cut baked apparatus 13 for sintering the cut end to obtain a finished glass tube G2, and a transport apparatus 14 for transporting the finished glass tube G2.

  First, as shown in FIG. 5, the tubular glass G is pulled by the tube drawing device 10 and continuously sent out in the horizontal direction. The tube drawing device 10 includes a pair of endless belts 102A and 102B made of a heat-resistant material that are horizontally opposed to each other with a predetermined gap therebetween and are configured to be rotatable in opposite directions by the rotation driving means 101. The tubular glass G is passed through these gaps and pulled by the frictional action with the endless belts 102A and 102B. The drawing speed of the tubular glass G is adjusted by controlling the rotation speed of the endless belts 102A and 102B.

A rough cutting device 11 is disposed at the end of the tube drawing device 10. As shown in FIG. 6, the rough cutting device 11 includes arm driving means 111, a vertical shaft 112, an arm 113 supported by the vertical shaft 112, and a rough cutting blade 114 attached to the tip of the arm 113. The arm 113 can be horizontally rotated about the vertical axis 112 by the arm driving means 111, and the rough cutting blade 114 is intermittently brought into contact with the outer peripheral surface of the tubular glass G to form a scratch. A bending moment due to its own weight acts on the tubular glass G so that cracks originating from scratches grow around the outer peripheral surface, and as shown in FIG. 4, the tubular glass G is a finished glass tube G2. Roughly cut into a glass parent tube G1 that is longer than the length of the cut loss G _CL , G _CL . The length of the roughly cut glass main pipe G1 is determined by the pipe drawing speed of the pipe drawing device 10, the time during which the rough cutting blade 114 of the rough cutting device 11 is intermittently brought into contact with the outer peripheral surface of the tubular glass G (rough cutting cycle). The rough cutting cycle can be arbitrarily changed by controlling the horizontal rotation speed of the arm 113 of the rough cutting device 11.

  As shown in FIG. 4, the glass master tube G1 roughly cut by the rough cutting device 11 falls, is received by the lower front conveyor 141, and further is a head roller chain conveyor (HRC) arranged at the end of the front conveyor 141. (Conveyor) 142.

  As shown in FIG. 7, the HRC conveyor 142 includes a driving means (not shown), two chains (not shown) that run in the horizontal direction (arrow direction) by the driving means (not shown), a two-chain, etc. And a rolling head roller 142A mounted at intervals. The glass master tube G1 is horizontally held one by one on the mounting surface formed by the adjacent head rollers 142A on the HRC conveyor 142, and is conveyed downstream (in the direction of the arrow) while rotating.

Further, a re-cut baked apparatus 13 including a cutting burner 131, a cutting blade 132, and a baked burner 133 is disposed at both side ends in the middle of the transport direction of the HRC conveyor 142. The glass main tube G1 is heated in the vicinity of both ends by the sharp flame of the cutting burner 131, and then the cutting blade 132 cooled with water or the like is brought into contact with the heated portion, and both ends are cut off by the effect of thermal stress (chill cut). It becomes the glass tube G2 ′ of the finished product length. At this time, the cut-off portion becomes a cut loss G _CL (FIG. 4).

  The finished product glass tube G2 'is heated at both ends by a mouth burner 133 in order to suppress the growth of minute cracks remaining at the cut end, and becomes a finished product glass tube G2. Thereafter, the glass tube G2 is transferred to the product conveyor 143 connected to the terminal end of the HRC conveyor 142, and is conveyed to the packing process.

  In the production of glass tubes, increasing the production efficiency is an important issue in reducing the production cost. To achieve this, the tube drawing speed must be increased and the cut loss must be reduced.

  In the conventional glass tube manufacturing equipment 1 described above, when the tube drawing speed is increased to increase the production efficiency and the rough cutting cycle is shortened (below 0.3 seconds), the rough cutting blade 114 of the rough cutting device 11 is The contact time with the outer peripheral surface of the tubular glass G is shortened, and it is difficult to make an appropriate scratch. The tubular glass G is not separated at the intended separation position, and does not fall on the front conveyor 141, or is not separated at all. In some cases, it continued to progress without being done. As a countermeasure against this, Patent Document 1 discloses that by installing a rotating roller in front of the direction of travel of the drawn tubular glass, the tubular glass can be surely separated by the rotating roller at a desired separation position. A rough cutting device is described.

Attempts have also been made to improve the cutting quality of rough cutting in order to reduce cut loss. For example, in Patent Document 2, the rough cutting device moves in synchronization with the traveling direction of the tubular glass, and scratches in the circumferential direction of the tubular glass. How to do is described.
JP-A-9-132421 JP-A-9-67136

  In the above-mentioned Patent Document 1, when the rough cutting cycle is short and the tube drawing speed is high, the impact when the glass parent tube comes into contact with the rotating roller is large, and there is a possibility of causing damage to the end portion of the glass parent tube. .

  In addition, when the rough cutting blade 114 is abutted strongly in order to make an appropriate scratch on the outer peripheral surface of the tubular glass when the tube drawing speed is increased, a plurality of outer peripheral surfaces of the tubular glass G are arranged in directions other than the circumferential direction. This causes cracks to worsen the cutting quality, or the downward action of the rough cutting blade 114 makes the falling state of the glass main tube G1 unstable, and the front conveyor 141 smoothly conveys the glass main tube G1. May not be done. That is, the glass parent tube G1 overlaps or a phenomenon such as the glass parent tube G1 deviating obliquely with respect to the pulling direction, so-called “gull” occurs, and the outer peripheral surface of the glass parent tube G1 is scratched. The glass parent tube G1 is damaged. In the worst case, there is a possibility that the production line may be stopped, and the production efficiency is greatly reduced by the “gull”.

  Further, even in Patent Document 2, when the tube drawing speed is high, the contact time of the cutting blade to the outer peripheral surface of the tubular glass G is shortened, and it is difficult for an appropriate scratch to enter. There is a possibility that it will not be cut off and will not fall on the front conveyor 141, or it may continue without being cut off at all.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a glass tube manufacturing facility that can reliably perform rough cutting and reduce cut loss even when the tube drawing speed is increased in order to increase production efficiency. .

  In order to solve the above-mentioned problems, the glass tube manufacturing equipment of the present invention roughly cuts the tubular glass into a glass main tube having a length of approximately n glass tubes (n is a natural number of 2 or more). A rough cutting device provided with a cutting blade intermittently abutting on the outer peripheral surface of the tubular glass, a dividing device for dividing and cutting the glass main tube into substantially the same length as the glass tube, and a glass parent tube and / or And a transport device for transporting the glass tube.

  Further, in the method for producing a glass tube of the present invention, a glass glass tube is produced by roughly cutting a tubular glass into two or more glass tube lengths, and then the glass glass tube is approximately the same length as the glass tube. The glass parent tube is obtained by dividing and cutting into two.

  Since the present invention is configured as described above, the rough cutting cycle can be made longer even when the tube drawing speed is increased, so that the time for the cutting blade to come into contact with the outer peripheral surface of the tubular glass is increased, and an appropriate scratch is caused. Since it is easy to enter and can be reliably roughly cut, the rough cut surface is not in a sawtooth state and is cut substantially perpendicular to the tube axis direction, so that cut loss can be reduced. In addition, since appropriate scratches enter, it is not necessary to make the cutting blade abut more strongly than necessary on the outer peripheral surface of the tubular glass, the downward action of the cutting blade is small, and the falling state of the glass main tube is stable, “Gome” in the next process can be avoided, and a decrease in the production efficiency of the glass tube can be suppressed.

  In addition, when roughly cutting the tubular glass by the rough cutting device, the result of the reduction of the required rough cutting site, that is, to obtain n glass master tubes, there were conventionally 2n rough cutting sites, In the present invention, the number is 1 / n per line. In the subsequent process (dividing device), n-1 locations are divided and cut by chill cutting, so that rough cutting locations are reduced. In addition, the split cutting by chill cutting can obtain a glass parent tube that has a smooth cut shape and can be cut more perpendicularly to the tube drawing direction than rough cutting, so the cut loss for that portion is zero or Even if it cannot be zero, it can be shortened. Therefore, in the present invention, even if both ends of the glass parent tube or one of the roughly cut ends are further chill-cut after dividing and cutting to obtain a glass tube having a finished product length, cut loss can be reduced by the amount of divided cutting portions due to chill cutting. .

  In the glass tube manufacturing facility of the present invention, the transfer device makes the transfer time at the time of transferring the glass master tube divided into n pieces by the dividing device to the n rows of transfer means differ in at least two rows. It is characterized by comprising transfer means and aligning means for aligning at most n-1 rows of n rows of glass master tubes.

  The glass tube manufacturing method of the present invention is characterized in that n rows of glass master tubes are aligned in at most n-1 rows.

  When the present invention is configured as described above, the space can be used more efficiently than in the case where n conventional glass tube manufacturing facilities are arranged side by side, and the conveying device, packing facility, etc. are minimized. This is preferable because the manufacturing cost can be kept low.

  The glass tube manufacturing facility of the present invention comprises a re-cut baked apparatus having cutting means for simultaneously cutting both ends of a glass parent tube, and scalloped means for slicing the cut end to obtain a glass tube. To do.

  Moreover, the manufacturing method of the glass tube of this invention cut | disconnects both ends of a glass parent tube simultaneously, and gives a glass tube by giving a mouth-cooking to a cut end.

  The present invention is preferably configured as described above because the distance between the cutting blades at both ends is always constant and the dimensional accuracy of the glass tube length is increased.

  According to the glass tube manufacturing facility of the present invention, even if the tube drawing speed is increased, the rough cutting cycle can be made longer, so that the time for the cutting blade to contact the outer peripheral surface of the tubular glass becomes longer, and appropriate scratches are generated. Since it is easy to enter and can be reliably roughly cut, the rough cut surface is not in a sawtooth state and is cut substantially perpendicular to the tube axis direction, so that cut loss can be reduced. In addition, since appropriate scratches enter, it is not necessary to make the cutting blade abut more strongly than necessary on the outer peripheral surface of the tubular glass, the downward action of the cutting blade is small, and the falling state of the glass main tube is stable, “Gome” in the next process can be avoided, and a decrease in the production efficiency of the glass tube can be suppressed.

  In addition, when roughly cutting the tubular glass by the rough cutting device, the result of the reduction of the required rough cutting site, that is, to obtain n glass master tubes, there were conventionally 2n rough cutting sites, In the present invention, the number is 1 / n per line. In the subsequent process (dividing device), n-1 locations are divided and cut by chill cutting, so that rough cutting locations are reduced. In addition, the split cutting by chill cutting can obtain a glass parent tube that has a smooth cut shape and can be cut more perpendicularly to the tube drawing direction than rough cutting, so the cut loss for that portion is zero or Even if it cannot be reduced to zero, it can be shortened. Therefore, in the present invention, even if both ends of the glass parent tube or one of the roughly cut ends are further chill-cut after dividing and cutting to obtain a glass tube having a finished product length, cut loss can be reduced by the amount of divided cutting portions due to chill cutting. .

  Below, embodiment of the glass tube manufacturing equipment 2 of this invention is described with reference to figures.

  FIG. 1 is a schematic explanatory diagram of a glass tube manufacturing facility 2 according to the present invention.

  The glass tube manufacturing equipment 2 of the present invention includes a tube drawing device 10 that pulls the tubular glass G, a rough cutting device 11 that roughly cuts the tubular glass G to obtain a glass main tube G1 ′, and a glass main tube G1 ′. A dividing device 22 that obtains a glass parent tube G1 by dividing and cutting it to approximately the same length as the tube G2, and a glass tube G2 of a finished product by recutting the glass parent tube G1 to a predetermined length and subjecting the cut end to mouth burning. The re-cut calcination device 13 for obtaining the above and the conveying device 24 for conveying the glass parent tube G1 and the finished glass tube G2 are provided.

  As shown in FIG. 5, the tube drawing device 10 includes a pair of endless belts made of a heat-resistant material that are horizontally opposed to each other with a predetermined gap therebetween and are configured to be rotatable in opposite directions by the rotation driving means 101. 102A and 102B are provided, and the tubular glass G is passed through the gap between them and pulled by the frictional action with the endless belts 102A and 102B. The drawing speed of the tubular glass G is adjusted by controlling the rotation speed of the endless belts 102A and 102B.

  As shown in FIG. 6, the rough cutting device 11 includes arm driving means 111, a vertical shaft 112, an arm 113 supported by the vertical shaft 112, and a rough cutting blade 114 attached to the tip of the arm 113. The arm 113 can be horizontally rotated about the vertical axis 112 by the arm driving means 111, and the rough cutting blade 114 is intermittently brought into contact with the outer peripheral surface of the tubular glass G to form a scratch.

  The arm driving unit 111 includes a speed change mechanism (not shown) that reduces the rotational speed of the arm 113. As the speed change mechanism of the arm driving means 111, a mechanical variable speed mechanism or an electric variable speed mechanism by frictional action can be used, but synchronization with the pipe drawing speed of the pipe drawing device 10 is easy. It is preferable to use an electrically variable speed mechanism such as an inverter motor or a servo motor because the length of the glass main tube G1 to be roughly cut can be easily switched.

  The transport device 24 includes a front conveyor 141, a first conveyor 244, a second conveyor 245 including two rows of attachment chain conveyors (AC conveyors) 245 a and 245 b, a first conveyor 244 and a second conveyor 245. , A transfer device 246 disposed in between, an alignment device 249 installed on the AC conveyor 245a, and a product conveyor 143.

  The first conveyor 244 is connected to the end of the front conveyor 141 in a direction orthogonal to the axial direction of the glass main tube G1. The first conveyor 244 has the same structure as the head roller chain conveyor 142 (HRC conveyor) shown in FIG.

  The dividing device 22 is disposed in the middle of the conveying direction of the first conveyor 244, and includes a cutting burner and a cutting blade (both not shown).

  When the glass main pipe G1 ′ reaches the position of the dividing device 22 in the middle of the conveying direction of the first conveyor 244, the outer periphery near the center of the glass main pipe G1 ′ is heated by the flame of the cutting burner and then cooled. The cut blade comes into contact with the heated portion, and the substantial center of the glass main tube G1 ′ is divided and cut into two glass main tubes G1a and G1b by the action of thermal stress.

  As shown in FIG. 2, the AC conveyors 245a and 245b are equipped with a pair of glass parent pipes G1a and G1b by attaching attachments 2452 at equal intervals on a two-chain chain 2451 that travels in the horizontal direction by driving means (not shown). The attachments 2452 and 2452 are configured to be held horizontally and conveyed one by one.

  As shown in FIGS. 2A and 2B, the transfer device 246 is disposed at the end of the two rails 244A extending from the end of the first conveyor 244 toward the downstream side, and is long on the outer periphery. It is comprised by the two rotary bodies 246a and 246a which attached the nail | claw 247 and the short nail | claw 248 alternately, and the two rotary bodies 246b and 246b. The two rotators 246a and 246a are mounted coaxially with the AC conveyor 245a provided at the end of the transfer device 246, and the two rotators 246b and 246b are coaxially mounted with the AC conveyor 245b, respectively.

  The glass parent pipes G1a and G1b that have been divided and cut into two by the dividing device 22 and conveyed from the first conveyor 244 via the rail 244A reach the positions of the rotating bodies 246a and 246b, respectively. The glass parent tube G1a is STEP-1 shown in FIG. 2A, that is, when the short claw 248 of the rotating body 246a is at the 12 o'clock position (at time T1), the glass parent tube G1a is the long claw 247. When the contact is pressed from behind and rolls on the rail 244A, STEP-2, that is, when the long pawl 247 comes to the 12 o'clock position (at time T2), it is transferred to the AC conveyor 245a in the left column. It will be posted. On the other hand, the glass parent tube G1b is STEP-1 shown in FIG. 2B, that is, when the long claw 247 of the rotating body 246b is at the 12 o'clock position (at time T1), the glass parent tube G1b is When the second claw 248 is not in contact with STEP-2, that is, when the subsequent long claw 247 is in contact (at time T2), it is pressed on the rail 244A to roll on the rail 244A, and then STEP-3, When the long claws 247 come to the 12 o'clock position (at time T3), they are transferred to the AC conveyor 245b in the right row. In this way, the glass parent tube G1a and the glass parent tube G1b are transferred to the AC conveyors 245a and 245b at different transfer times, respectively. Therefore, the glass parent tube G1b is one pitch more than the glass parent tube G1a. (T3-T2 time) It will be conveyed on the AC conveyor 245b with a delay.

  The transfer device 246 is not limited to the above, and as shown in FIG. 3, the long claws 247 and the short claws 248 are alternately arranged on the chain 2451 of the AC conveyors 245a and 245b, and the AC conveyor 245a and the AC conveyor 245b The positions of the long claws 247 and the short claws 248 may be shifted so that a delay of one pitch occurs between them. In any of the transfer devices 246 described above, the short claws 248 include the long claws 247 and the short claws 248 so that the glass parent tube G1 is not pressed from the rear by the contact of the long claws 247 and moves in the transport direction. It plays the role which holds | maintains the glass parent tube G1 between.

  An alignment device 249 is disposed in a direction perpendicular to the axial direction of the glass parent tube G1a at an intermediate position in the conveyance direction of the AC conveyor 245a in the left column. The alignment device 249 inserts the glass parent tube G1a conveyed at equal intervals by the left row AC conveyor 245a into the gaps before and after the glass parent tubes G1b and G1b conveyed at equal intervals on the right row AC conveyor 245b. The main glass pipe G1a and the main glass pipe G1b are merged on the AC conveyor 245b in the right row and rearranged in a row.

  The aligning device 249 preferably has a spiral lead having a spiral lead corresponding to the attachment interval of the attachment 2452 of the AC conveyor 245a in the left column so as to contact the lower end of the outer peripheral surface of the glass parent tube G1a. Further, it may be of a round bar shape having a large frictional resistance with the glass main tube G1a and rotating around the shaft. One end of the glass main tube G1a is pressed toward the AC conveyor 245b side of the right column from the AC conveyor 245a side of the left column. It may be a plate-shaped guide plate or an endless belt that is moved in the axial direction. In this embodiment, the alignment device 249 is arranged on the AC conveyor 245a in the left row, but may be arranged on the AC conveyor 245b in the right row.

  A re-cut baked apparatus for obtaining a finished glass tube G2 by re-cutting the glass main pipes G1a and G1b to a predetermined length at both ends near the end of the AC conveyor 245b in the right row and subjecting the cut end to keratin. 13 and 13 are arranged.

  As shown in FIG. 7A, the re-cut baked apparatuses 13 and 13 each include a pair of cutting burners 131, a cutting blade 132, and a baked burner 133.

The glass main tube G1 is heated in the vicinity of both ends by the sharp flame of the cutting burner 131, and then the cutting blade 132 cooled with water or the like is brought into contact with the heated portion, and both ends are cut off by the effect of thermal stress (chill cut). It becomes the glass tube G2 ′ of the finished product length. At this time, the cut-off portion becomes a cut loss G _CL (FIG. 4).

  The finished product glass tube G2 'is heated at both ends by a mouth burner 133 in order to suppress the growth of minute cracks remaining at the cut end, and becomes a finished product glass tube G2. Thereafter, the glass tube G2 is transferred to the product conveyor 143 connected to the terminal end of the AC conveyor 245b and conveyed to the packing process. The finished glass tube G2 has a high dimensional accuracy in the longitudinal direction because the distance between the two cutting blades 132 and 132 is constant.

  Thereafter, the finished glass tube G2 is transferred to the product conveyor 143.

  Although the glass tube manufacturing equipment of the present embodiment is configured to simultaneously obtain two glass tubes G2 having the same length from one glass main tube G1 ′, the present invention is not limited to this. For example, one glass You may comprise so that three or more glass tubes of the same length may be obtained simultaneously from a main tube, or you may comprise so that two or more glass tubes of different length may be obtained simultaneously from one glass main tube. .

It is a schematic plan view of the glass tube manufacturing equipment of the present invention. It is principal part explanatory drawing of a transfer apparatus, (a) is explanatory drawing of the transfer method of the glass parent tube G1a, (b) is explanatory drawing of the transfer method of the glass parent tube G1b. It is principal part explanatory drawing of the other form of a transfer apparatus, (a) is explanatory drawing of the transfer method of glass main tube G1a, (b) is explanatory drawing of the transfer method of glass main tube G1b. is there. It is a schematic plan view of the glass tube manufacturing equipment of a prior art. It is the schematic plan view (a) and front view (b) of a pipe drawing apparatus and a rough cutting apparatus. It is a schematic side view of a rough cutting device. It is principal part explanatory drawing (a) and a partial enlarged view (b) of a re-cut calcination apparatus.

Explanation of symbols

G Tubular glass G1 'Glass main tube G _CL cut loss G1, G1a, G1b Glass master tube G2 Finished glass tube G2' Finished glass tube 1 Conventional glass tube manufacturing equipment 10 Tube drawing device 101 Rotation drive means 102A , 102B Endless belt 11 Rough cutting device 111 Arm driving means 112 Vertical axis 113 Arm 114 Rough cutting blade 13 Re-cut calcination device 131 Cutting burner 132 Cutting blade 133 Kaki ware burner 14, 24 Conveying device 141 Front conveyor 142 Head roller chain conveyor ( HRC conveyor)
142A Head roller 143 Product conveyor 2 Glass tube manufacturing equipment of the present invention 22 Dividing device 244 First conveyor 244A Rail 245 Second conveyor 245a, 245b Attachment chain conveyor (AC conveyor)
2451 Chain 2452 Attachment 246 Transfer device 246a, 246b Rotating body 247 Long claw 248 Short claw 249 Alignment device

Claims (6)

  Rough cutting device provided with a cutting blade that intermittently abuts on the outer peripheral surface of the tubular glass so as to roughly cut the tubular glass into a glass main tube having a length of about n glass tubes (n is a natural number of 2 or more). And a glass splitting device that splits and cuts the glass main tube into substantially the same length as the glass tube to obtain a glass master tube, and a glass master tube and / or a transport device that transports the glass tube. Pipe manufacturing equipment.   The transfer device includes transfer means for transferring the glass parent pipes divided into n pieces by the dividing device to the n rows of transfer means so that the transfer times are different in at least two rows, and the n rows of glass. 2. The glass tube manufacturing equipment according to claim 1, further comprising alignment means for aligning the parent tube in at most n-1 rows.   3. The re-cut baked apparatus having a cutting means for simultaneously cutting both ends of the glass main tube and a mouth baked means for obtaining a glass tube by subjecting the cut end to mouth calcination. Glass tube manufacturing equipment.   The tube glass is roughly cut to a length of n glass tubes (n is a natural number of 2 or more) to produce a glass main tube, and then the glass main tube is divided and cut into approximately the same length as the glass tube. To obtain a glass parent tube.   The glass tube manufacturing method according to claim 4, wherein the n rows of glass master tubes are aligned in at most n-1 rows.   The method for producing a glass tube according to claim 4 or 5, wherein both ends of the glass parent tube are cut simultaneously, and the cut end is subjected to mouth burning to obtain a glass tube.