JP2013203585A - Method for monitoring and treating gob, and gob generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of trouble during forming by monitoring a generated stringy state caused by biting foreign matter in molten glass by a blade of a cutter mechanism during a cutting operation by the cutter mechanism.SOLUTION: Molten glass G derived from a molten glass derivation mechanism 1 and drooping down is cut by shear blades 20A, 20B of a cutter mechanism 2 using a servomotor as a driving source to generate a gob g. By monitoring a load state of an AC servomotor, it is determined whether the shear blades 20A, 20B are brought into contact with foreign matter in the molten glass G and the foreign matter is bitten by the shear blades 20A, 20B or not during the cutting operation by the cutter mechanism 2. When determined that foreign matter is bitten by the shear blades 20A, 20B, a stringy state is generated, and therefor a gob discard mechanism 4 is operated, to thereby discard a gob g generated by the cutting operation and a gob g generated by the next cutting operation.

Description

  This invention relates to a gob generating device for generating a lump of molten glass called `` gob '' by cutting a molten glass that has been drawn and hung down from a molten glass derivation mechanism by a cutter mechanism. In particular, the present invention relates to a gob monitoring processing method that is applied to monitor a defective production of a gob that occurs due to a foreign object in molten glass biting into a blade of the cutter mechanism during a cutting operation by the cutter mechanism.

  Conventionally, as shown in FIG. 8, this type of gob generating apparatus cuts the molten glass G that is led out from the molten glass derivation mechanism 1 that hangs down the molten glass G that is led out downward. And a cutter mechanism 2 for generating a gob g. The generated gob g falls, is guided by the gob guide mechanism 3, and is guided to a plurality of sections (10 sections of S1 to S10 in the drawing) of the bottle making machine 9. The gob guide mechanism 3 includes a scoop 30 for distributing the gob g to each section, and a trough 31 and a deflector 32 for guiding the gob g delivered from the scoop 30 to the mold of each section. In the figure, 33 is a servo motor that rotates the scoop 30 to distribute the gob g, and 90 is a conveyor that conveys the glass bottles manufactured in each section to the next process.

  As shown in FIG. 9, the molten glass lead-out mechanism 1 is provided with an orifice 11 at the bottom of the spout 10 that accumulates the molten glass G, and a plunger 12 for pushing the molten glass G out of the orifice 11 inside the spout 10. It is deployed movably. When the plunger 12 descends from the top dead center, the molten glass G in the spout 10 is led out from the orifice 11 as it descends and hangs down in a columnar shape. When the plunger 12 reaches the bottom dead center and starts to rise, the cutter mechanism 2 is operated, and the shear glass 20A, 20B reciprocates, whereby the molten glass G hanging from the orifice 11 is cut and a gob g is generated ( For example, see Patent Document 1).

International Publication No. 2011/118616

  By the way, the molten glass G contains foreign matters such as chippings of bricks constituting the melting furnace and fore-hearth, unmelted glass raw materials, and ceramics contained in the raw material cullet. When the molten glass G hanging down from the orifice 11 is cut by the cutter mechanism 2, as shown in FIG. 10, if foreign matter s is present at the cut position, the foreign matter s is shear blades 20 </ b> A and 20 </ b> B of the cutter mechanism 2. The molten glass G may not be cut completely. In such a case, the molten glass G extends linearly and is connected to the gob g (this state is referred to as a “stringing state”, indicated by p in the drawing).

  When this yarn pulling state p occurs, the glass stretched in the shape of the yarn is then broken by the load of the gob g and falls together with the gob g. This delays and delays the timing at which the gob g is introduced into the mold, which hinders the molding of the glass bottle and causes troubles. Further, when the filamentous glass accompanying the gob g is divided from the gob g inside the trough 31 or the deflector 32, it adheres to the surface of the gob g that passes through the trough 31 and the like, and is formed by the gob g. May cause defects in glass bottles.

  The present invention has been made paying attention to the above-mentioned problem, and by monitoring the thread drawing state generated due to the foreign matter in the molten glass biting into the blade of the cutter mechanism during the cutting operation by the cutter mechanism. An object of the present invention is to provide a gob monitoring processing method that prevents the occurrence of troubles during molding and the like, and a gob generating device that implements the method.

  The gob monitoring processing method according to the present invention is a gob generating apparatus that generates a gob by cutting a molten glass that has been drawn and hung down from a molten glass derivation mechanism with a cutter mechanism that uses a servo motor (for example, an AC servo motor) as a drive source. By monitoring the load state of the servo motor, it is determined whether foreign matter in the molten glass is caught in the blade of the cutter mechanism during the cutting operation of the cutter mechanism, and when it is determined that foreign matter is caught in the blade, The gob generated by the cutting operation and the gob generated by the next cutting operation are discarded.

  In the above gob generator, when the foreign material in the molten glass bites into the blade of the cutter mechanism during the cutting operation and the foreign material cannot be completely cut, a thread drawing state occurs. At this time, the load state of the servo motor is large. Thus, torque and load current increase. By monitoring the load state of the servo motor, it is possible to determine whether or not a thread drawing state has occurred due to a foreign object biting into the blade of the cutter mechanism. If it is determined that a foreign object is caught in the blade of the cutter mechanism, the gob generated by the cutting operation is discarded, and the gob is not introduced into the mold, so molding due to a delay in the fall timing of the gob Trouble of time does not occur. In addition, since the gob generated by the cutting operation and the gob generated by the next cutting operation are discarded, the filamentous glass accompanying the gob is cut off from the gob inside the trough, and then the trough etc. It does not stick to the gob that passes through the glass bottle and does not cause defects in the molded glass bottle.

  A gob generating device according to the present invention includes a molten glass derivation mechanism for deriving molten glass, a cutter mechanism that includes a servo motor as a driving source and generates a gob by cutting the molten glass that has been drawn and hung down from the molten glass derivation mechanism; The servo motor comprises a gob guide mechanism that guides the generated gob to a mold for glass product molding, and whether the foreign material in the molten glass is caught in the blade of the cutter mechanism during the cutting operation by the cutter mechanism. A monitoring control device that monitors by the torque or load current of the machine, and when the monitoring control device determines that a foreign object in the molten glass has bitten into the blade of the cutter mechanism, the gob generated by the cutting operation and the next cutting operation A gob discarding mechanism for discarding the generated gob so that the gob is not guided to the mold for glass product molding.

  In the gob generating apparatus having the above-described configuration, when the molten glass is led out and droops from the molten glass lead-out mechanism, the blade of the cutter mechanism is operated by driving the servo motor, and the molten glass is cut to generate the gob. The monitoring control device monitors whether the foreign material in the molten glass is caught in the blade of the cutter mechanism during the cutting operation by the cutter mechanism by the torque or load current of the servo motor. When it is determined that the thread has been bitten, a thread drawing state has occurred, so that the gob generated by the cutting operation and the gob generated by the next cutting operation are not guided to the mold for glass product molding. It is destroyed by the gob destruction mechanism.

  In a preferred embodiment of the present invention, the monitoring control device samples the value of the torque or load current of the servo motor during the cutting operation by the cutter mechanism, and when the sampling value exceeds a predetermined threshold value, the cutter mechanism It is determined that the foreign material in the molten glass is caught in the blade.

  In the above-described configuration of the present invention, the gob guide mechanism includes a scoop for distributing the gob to a plurality of sections, and a trough and a deflector for guiding the gob delivered from the scoop to the mold of each section. In addition, the gob discarding mechanism can be configured to reciprocate a shutter capable of closing the scoop entrance by a cylinder mechanism.

  In this embodiment, the shutter of the gob discarding mechanism normally opens the entrance of the scoop, and the generated gob is introduced into the scoop and delivered to the trough. Guided to the mold. When it is determined that the foreign material in the molten glass is caught in the blade of the cutter mechanism, the cylinder mechanism of the gob discard mechanism is driven and the entrance of the scoop is closed by the shutter, so the generated gob is introduced into the scoop It is discarded without being.

  According to the present invention, the yarn pulling state generated due to the foreign matter in the molten glass biting into the blade of the cutter mechanism during the cutting operation by the cutter mechanism is monitored, so that the forming caused by the occurrence of the yarn pulling state is performed. Occurrence of trouble at the time can be prevented. Further, since the filamentous glass is not separated from the gob in the trough or the deflector and remains, it does not adhere to the gob that passes through the trough and the like, and does not cause defects in the molded glass product.

It is explanatory drawing which shows schematic structure of the gob production | generation apparatus which is one Example of this invention. It is a top view which shows the structural example of a cutter mechanism. It is a block diagram which shows the electric constitution of the gob production | generation apparatus which is one Example of this invention. It is a block diagram which shows the circuit structural example of a servo drive control apparatus. It is explanatory drawing which shows the specific example of the load waveform of an AC servomotor. It is explanatory drawing which expands and shows the load waveform of the AC servomotor at the time of cutting operation by a cutter mechanism. It is a flowchart which shows the flow of the monitoring control by a control part. It is explanatory drawing which shows schematic structure of a bottle making equipment. It is explanatory drawing which shows schematic structure of a gob production | generation apparatus. It is explanatory drawing which shows the thread drawing state generate | occur | produced at the time of gob production | generation.

1 to 7 show an embodiment of a gob generating apparatus for carrying out the gob monitoring processing method of the present invention. However, the present invention is not limited to this embodiment, and The scope of the present invention is not limited by the embodiments.
The gob generator shown in the drawing generates a gob g to be sequentially supplied to the molds 91 arranged in a plurality of sections of the bottle making machine 9, and as shown in FIG. A molten glass derivation mechanism 1 to be generated, a cutter mechanism 2 that generates a gob g by cutting the molten glass G that is derived from the molten glass derivation mechanism 1 and hangs down in a column shape with shear blades 20A and 20B, and the generated gob g. And a gob guide mechanism 3 that leads to a mold 91 of the bottle making machine 9.

  The molten glass lead-out mechanism 1 includes a spout 10 that stores molten glass G introduced from a glass melting furnace (not shown), and an orifice 11 that leads the molten glass G downward is formed at the center of the bottom of the spout 10. . Inside the spout 10, a plunger 12 and a tube 13 are arranged so as to be vertically movable. The tube 13 is for controlling the weight of the gob g, and the amount of the molten glass G derived from the orifice 11 is changed by the vertical movement of the tube 13, and the weight of the gob g is changed. The plunger 12 extrudes the molten glass G from the orifice 11 and sets the shape of the gob g. When the plunger 12 descends, the molten glass G is pushed out of the orifice 11 and hangs down. Since the molten glass G hangs down when the plunger 12 moves up, the molten glass G is sucked from the orifice 11. The shape of the gob g is determined by the timing and the cutting position.

  The cutter mechanism 2 is for cutting the molten glass G, which is led out from the orifice 11 and hangs down in a columnar shape, by reciprocating the two shear blades 20 </ b> A and 20 </ b> B, and is disposed immediately below the orifice 11. FIG. 1 shows a state immediately after the molten glass G led out from the orifice 11 and hung down is cut by the cutter mechanism 2, and a predetermined state immediately after the plunger 12 starts to rise after reaching the bottom dead center. The cutter mechanism 2 is operated at the timing. The shear blades 20A and 20B of the cutter mechanism 2 can be displaced in a direction approaching the orifice 11 and a direction away from the orifice 11. Further, the shake of the molten glass G at the time of cutting is regulated by the guide member 23 disposed below the shear blades 20A and 20B, and the falling posture of the gob g is adjusted.

As shown in FIG. 2, the cutter mechanism 2 of this embodiment is attached to the tips of two arms 21A and 21B that can be opened and closed so that the shear blades 20A and 20B face each other. In the illustrated example, two shear blades 20A and 20B are provided to generate two gobs g at the same time, but may be provided one by one. When each arm 21A, 21B pivots in the closing direction with the base end as the center, the shear blades 20A, 20B overlap in the vertical direction and the cutting edge moves in the opposite direction, whereby the molten glass G hanging down in a columnar shape from the orifice 11 Is cut and a gob g having a predetermined length L is generated. Each arm 21A, 21B is driven by a cutter drive mechanism 22 using the AC servomotor 5 as a drive source. The drive of the AC servomotor 5 is controlled by a motor drive control device 6 (shown in FIG. 3) described later.
The cutter mechanism 2 of this embodiment is of a type in which the shear blades 20A, 20B reciprocate by a predetermined angle integrally with the reciprocating rotation of the arms 21A, 21B, but instead, they face each other. It is also possible to use a type in which the shear blades are reciprocated linearly.

  The generated gob g falls downward in an upright posture, is guided by the gob guide mechanism 3, and is guided to the mold 91 of any section of the bottle making machine 9. The gob guide mechanism 3 includes a scoop 30 for distributing the gob g to each section, and a trough 31 and a deflector 32 for guiding the gob g delivered from the scoop 30 to the mold 91 of each section. .

  A gob discarding mechanism 4 for closing the entrance 30a of the scoop 30 and discarding the poorly formed gob g is disposed above the entrance 30a of the scoop 30. The gob discarding mechanism 4 in the illustrated example is configured to reciprocate a shutter 41 that can close the entrance 30 a of the scoop 30 by a cylinder mechanism 42. When it is determined by the motor drive control device 6 (shown in FIG. 3) that foreign matter in the molten glass G is caught in the shear blades 20A and 20B during the cutting operation by the cutter mechanism 2 and the above-described thread drawing state has occurred. The shutter 41 is closed by the cylinder mechanism 42 so that the poorly formed gob g due to the thread drawing state is not guided to the mold 91 by the gob guide mechanism 3.

  FIG. 3 shows the electrical configuration of the gob generator. In the figure, when the gob guidance control device 7 receives the gob discard signal j from the motor drive control device 6, the gob guide control device 7 opens the electromagnetic valve 44 to send the pressure air to the cylinder mechanism 42 of the gob discard mechanism 4. 43 is advanced to close the shutter 41. The cylinder mechanism 42 of this embodiment incorporates a return spring, and when the pressure air is extracted from the cylinder chamber, the cylinder rod 43 is retracted by the spring force and the shutter 41 is opened. The gob guidance control device 7 receives the timing signal from a timing circuit (not shown), drives the AC servo motor 35, rotates the scoop drive mechanism 36 by a predetermined angle, and communicates the scoop 30 with any trough 31. Let

  As shown in FIG. 4, the motor drive control device 6 includes a control unit 61, a power supply unit 62, and a load detector 65. The power source 62 is for supplying power to the AC servo motor 5 and includes a converter circuit 63 and an inverter circuit 64. The converter circuit 63 rectifies the commercial power supply and temporarily converts it into a DC power supply. Based on the drive signal D from the control unit 61, the inverter circuit 64 converts the DC power into a three-phase AC voltage having a frequency necessary for driving the AC servomotor 5, and outputs it to the AC servomotor 5. The load detector 65 detects the torque or load current of the AC servomotor 5 and feeds back the detected value I to the control unit 61.

  Although not shown, the control unit 61 is constituted by a microprocessor including a CPU and a memory, and feeds back the position and speed of the rotor of the AC servo motor 5 from the encoder 66, and shear blades 20 </ b> A and 20 </ b> B of the cutter mechanism 2. The AC servo motor 5 is controlled so that the opening degree of becomes the command value. The control unit 61 has a function as a monitoring control unit in addition to the function as the drive control unit described above. Is inspected by the torque or load current of the AC servo motor 5 to determine whether or not the above-described thread drawing state in which the molten glass G and the gob g are connected has occurred.

  The control unit 61 as a drive control unit obtains the speed of the AC servomotor 5 based on the signal Z from the encoder 66 and compares the speed with the speed reference F to calculate the load command value of the AC servomotor 5. Then, the drive signal D is given to the inverter circuit 64 in comparison with the detection value I by the load detector 65.

  The control unit 61 serving as the monitoring control unit samples the torque or load current of the AC servo motor 5 at a constant period during the cutting operation by the cutter mechanism 2, and when the sampled value exceeds a predetermined threshold value TH, It is determined that the yarn pulling state has occurred because the foreign matter s in the molten glass G is caught in the shear blades 20A and 20B of the mechanism 2. When the yarn pulling state occurs, the thread-like glass is integrally attached to the gob g generated by the cutting operation and the gob g generated by the next cutting operation, so that the shear blade 20A, 20B When determining that the foreign object s is caught, the control unit 61 generates a gob discard signal j for discarding the gob g generated by the cutting operation and the gob g generated by the next cutting operation. Output to gob guidance control device 7. In FIG. 3, the operation panel 68 is operated by a staff member to drive or stop the cutter mechanism 2.

  FIG. 5 shows a change in load of the AC servo motor 5 with respect to time on the horizontal axis (change in torque value in the figure). In the figure, i1 to i8 indicate torque values of the AC servomotor 5 when a plurality of (eight in the illustrated example) gobs g1 to g8 are successively generated. In the case of the illustrated example, when the fifth gob g5 is generated, foreign matter s in the molten glass G is caught in the shear blades 20A and 20B of the cutter mechanism 2, and the stringing state is generated. , 20B is in a state where the foreign matter s is caught and the foreign matter s cannot be cut completely, a large torque (indicated by x in the figure) is applied to the AC servo motor 5. In this case, the foreign material s that could not be cut into one of the fifth gob g5 and the sixth gob g6, and the filamentous glass due to the breakage of the thread-drawn state adhered to both. Therefore, these gobs g5 and g6 are discarded as defective generations.

  FIG. 6 (1) shows the load waveform (torque waveform in the figure) of the AC servomotor 5 during normal cutting operation by the cutter mechanism 2, and FIG. 6 (2) shows molten glass on the shear blades 20A and 20B. A load waveform of the AC servomotor 5 when the foreign matter s in G is bitten and a thread drawing state occurs is shown. When the foreign matter s is caught in the shear blades 20A and 20B of the cutter mechanism 2 and the foreign matter s cannot be cut completely, the AC servo motor 5 is subjected to a large torque as indicated by x in FIG. ing. In FIG. 6, TH indicates a threshold value set for determining whether or not the load state of the AC servo motor 5 is normal. In FIG. 6 (2), torque exceeding the threshold value TH is shown. Is on.

  The above threshold value TH is set by the personal computer 67 shown in FIG. 3, and the clerk operates the keyboard while displaying the load waveform of the AC servo motor 5 on the display screen of the personal computer 67. Sets or adjusts the threshold value TH. The set threshold value TH is stored in the memory of the control unit 61 of the motor drive control device 6.

FIG. 7 shows a flow of monitoring control by the CPU of the control unit 61. In the figure, “ST” is an abbreviation of “STEP” and indicates each procedure in the flow of monitoring control.
In ST1 of the figure, it is determined whether or not the above threshold value TH has been set. If the determination is "YES", the load state of the AC servomotor 5 is monitored in the next ST2. It is determined whether to start. When the molten glass G in the spout 10 of the molten glass lead-out mechanism 1 is led out from the orifice 11 and hangs down in a columnar shape and the cutter mechanism 2 starts to operate, the determination of ST2 becomes “YES”, and the CPU of the control unit 61 detects the load. The load value detected by the device 65 is sampled and compared with the threshold value TH (ST3, 4). If the load value is equal to or less than the threshold value TH, the determination in ST5 is “NO”, and thereafter, similar sampling processing (ST3) and comparison processing (ST4) are executed.

  The sampling process described above is repeatedly executed at a fixed period for a predetermined period during which the shear blades 20A and 20B of the cutter mechanism 2 reciprocate. If the load value does not exceed the threshold value TH until the cutting is completed, ST6 Is “YES”. At this point in time, a foreign object detection flag F, which will be described later, is not set, so the next determination in ST11 is also “NO”, and the next cutter mechanism 2 waits for the start of the cutting operation (ST2). In the cutting operation by the cutter mechanism 2 this time, the thread pulling state due to foreign matter biting into the shear blades 20A and 20B did not occur, so that the generated gob g is normal and the scoop 30, trough 31 and deflector 32 are normal. After that, it is guided to the mold 91 of the bottle making machine 9.

  Now, in the cutting operation by the cutter mechanism 2, when the load of the AC servomotor 5 increases and the sampled load value exceeds the threshold value TH during a predetermined period in which the shear blades 20A and 20B reciprocate. Then, it is determined that the foreign matter has been caught in the shear blades 20A and 20B and the thread pulling state has occurred, the determination of ST5 is “YES”, the process proceeds to ST7, and it is determined whether the foreign object detection flag F is set. The foreign object detection flag F is set in the memory of the control unit 61 when the load value exceeds the threshold value TH. At this time, the foreign object detection flag F has not been set yet, so the determination in ST7 Is “NO”, and the foreign object detection flag F is set in the next ST8.

In the next ST9, the CPU of the control unit 61 generates the gob discard signal j, calculates the timing for discarding the poorly generated gob g, that is, the timing for operating the gob discard mechanism 4, and then discards the gob at that timing. The signal j is output (ST10). Note that the operation timing of the gob discard mechanism 4 is, for example, when the gob g is generated and dropped by a photoelectric sensor or the like, and when the detection signal is output, the gob g reaches the entrance of the scoop 30. It can be obtained by adding the time required.
In the cutting operation by the cutter mechanism 2 this time, foreign matter is caught in the shear blades 20A and 20B, and the thread pulling state is generated. Therefore, the gob discarding mechanism 4 is activated, and the poorly formed gob g is generated at the entrance 30a of the scoop 30 It is discarded before and is not guided to the mold 91 of the bottle making machine 9.

  In the next cutting operation by the cutter mechanism 2, when the load value of the AC servo motor 5 remains below the threshold value TH, the determination of ST5 is “NO” and the determination of ST6 is “YES”. In ST11, it is determined whether or not the foreign object detection flag F is set. In this case, since the load value of the AC servomotor 5 exceeds the threshold value TH and the foreign object detection flag F is set in the previous cutting operation, the determination in ST11 is “YES”, and the gob discard signal j is determined in ST12. Is generated, and the timing for discarding the poorly generated gob g, that is, the timing for operating the gob discard mechanism 4 is calculated, and after the gob discard signal j is output at that timing (ST13), foreign object detection The flag F is reset (ST14).

DESCRIPTION OF SYMBOLS 1 Molten glass derivation | leading-out mechanism 2 Cutter mechanism 3 Gob guide mechanism 4 Gob discard mechanism 5 AC servo motor 6 Motor drive control apparatus 30 Scoop 31 Trough 32 Deflector 61 Control part

Claims (4)

  In a gob generator that generates a gob by cutting a molten glass that has been drawn and hung down from a molten glass lead-out mechanism by a cutter mechanism using a servo motor as a drive source, the load state of the servo motor is monitored by monitoring the load state of the servo motor. It is determined whether foreign material in the molten glass is caught in the blade of the cutter mechanism during the cutting operation. A gob monitoring processing method, wherein the gob is discarded.   A molten glass derivation mechanism for deriving the molten glass, a cutter mechanism that includes a servo motor as a drive source and that is derived from the molten glass derivation mechanism and generates a gob by cutting down the molten glass, and molding the generated gob into a glass product In a gob generating device comprising a gob guide mechanism that leads to a metal mold for use, whether or not a foreign substance in the molten glass is caught in the blade of the cutter mechanism during the cutting operation by the cutter mechanism is monitored by the torque or load current of the servo motor And a gob generated by the cutting operation and a gob generated by the next cutting operation when it is determined by the monitoring control device that foreign matter in the molten glass is caught in the blade of the cutter mechanism. A gob generating device having a gob discarding mechanism for discarding the product so as not to be guided to a mold for product molding.   The monitoring control device samples the value of the torque or load current of the servo motor during the cutting operation by the cutter mechanism, and when the sampling value exceeds a predetermined threshold, foreign matter in the molten glass is caught on the blade of the cutter mechanism. The gob generating device according to claim 2, wherein the gob generating device determines that the bite has been caught.   The gob guide mechanism includes a scoop for distributing the gob into a plurality of sections, a trough and a deflector for guiding the gob delivered from the scoop to a mold of each section, and the gob discarding mechanism includes an entrance of the scoop. The gob generating device according to claim 2, wherein a shutter capable of closing the part is configured to reciprocate by a cylinder mechanism.

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