JP3796794B2 - Molten glass cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molten glass cutting device for cutting molten glass (gob). More particularly, cathode ray tube glass panel putting molten glass into the mold, to the molten glass cutting device for cutting the molten glass melted falling from above when molding the funnel like.
[0002]
[Prior art]
Glass panel for cathode ray tube, a funnel, etc., the molten glass melted cut with molten glass cutting apparatus, and molding the cut molten glass placed in the mold.
[0003]
The conventional molten glass cutting apparatus employs an air driven shear machine, and cuts the molten glass by opening and closing a pair of arms to which blades (blades) are attached by air drive. From the open pair of arms attached to the blade to the closed, the operation switching from the closed to the open, a stopper to stop each other arm each other collide from opposite direction in the closed position, the reverse operation of the air cylinder The direction of operation was forcibly reversed.
[0004]
[Problems to be solved by the invention]
However, in the conventional air-driven molten glass cutting device, when the pair of arms to which the blades are attached are closed from open to close and operate in the reverse direction from close to open, There are problems such as blades coming into contact with each other due to impact due to contact and vibration due to forced reversal of the operating direction, leading to blade deterioration and blade spillage.
[0005]
In addition, there is a limit to thin blades due to blade spillage and wear deterioration due to vibration. Further, since the air driven shear machine is originally an air system using an air cylinder, the cutting force is weak. Therefore, in the molding of a glass article, the molten glass cannot be cut well, and it is difficult to make the shear marks (surface dents and scratches) inevitable at the time of molding small and shallow. In other words, the molten glass cannot be cut at high speed, the contact time between the blade and the glass is increased, and the glass temperature of the cut portion is lowered, and this portion becomes a shear mark after molding so that it appears prominently in the molded product. Become.
[0006]
The air formula Shah machine, because it uses the reciprocating cylinder of the air system, the response speed, blade can shear mark by the decrease in temperature of the gob, as described above with time becomes longer in contact with the molten glass Become bigger and deeper. For this reason, a great amount of time is spent on polishing the shear mark after molding, which reduces productivity.
[0007]
On the other hand, US Pat. No. 5,336,289 discloses a molten glass cutting device that uses a hydraulically driven rack and pinion mechanism to open and close a pair of arms to which blades are attached. However, the apparatus the arm is supported on a separate shaft, a troublesome adjustment of the blade spacing, the structure is complicated.
[0008]
The present invention has been made in view of the shortcomings of the prior art, the smooth operation of the open to the closed and closed pair of arms fitted with a blade to open, eliminating the shock and vibration of the operation switch, The purpose is to provide a molten glass cutting device that enables the use of thin blades, shortens the contact time between the molten glass and the blade, makes the shear mark smaller and shallower, allows easy adjustment of the blade spacing, and has a simple structure. And
[0009]
[Means for Solving the Problems]
To achieve the above object, the present invention comprises a pair of arms that open and close symmetrically,
A blade for cutting molten glass attached to the tip of each arm;
An arm support shaft that coaxially supports the pair of arms;
A hydraulic rack and pinion mechanism in which the pinion rotates once by movement from one end of the rack to the other end;
An eccentric plate attached to the pinion shaft of the hydraulic rack and pinion mechanism;
A slide block that slides with the rail as a guide;
A connecting rod for connecting the eccentric plate and the slide block;
A link bar that connects the slide block and the pair of arms to operate the blade from open to closed and from closed to open;
Configured to continuously operate the blade from open to closed and from closed to open during one rotation of the pinion ;
A wheel connected to one arm of the pair of arms is attached to the arm spindle,
A blade spacing adjustment mechanism comprising a worm engaged with the wheel and a handle attached to the worm shaft of the worm;
Provided is a molten glass cutting device comprising a backlash removing spring that engages with the wheel .
In a preferred embodiment, the cutting unit including the blade, the arm, and the arm support shaft and the driving unit including the rack and pinion mechanism can be divided.
[0010]
In another preferred embodiment, the connecting rod is divided into two parts so that the cutting part and the driving part can be separated.
[0011]
Furthermore, in another preferred embodiment, a wheel connected to one arm of the pair of arms is attached to the arm support shaft,
Provided blade gap adjustment mechanism comprising a handle attached to the worm and the worm of the worm shaft to be engaged with the wheel,
A backlash removing spring that engages with the wheel is provided.
[0012]
When cutting molten glass, the pinion driven by the hydraulic rack and pinion mechanism rotates one step continuously from one end to the other end of the rack, and the pair of arms with blades attached is opened, closed, and closed. Smooth operation to open, eliminating the shock and vibration of operation switching.
[0013]
Further, since the hydraulic rack and pinion mechanism is used, the cutting force is increased and the response speed is increased.
[0014]
If the cutting part and the driving part can be divided, the cutting part and the driving part can be exchanged.
[0015]
If the connecting rod is divided into two parts so that the cutting part and the driving part can be divided, the connecting rod can be divided first, and then divided into the cutting part and the driving part.
[0016]
Furthermore, engaged in one of the arms of the wheel provided, a worm which engages with the wheel, by providing a blade distance adjusting mechanism comprising a handle attached to the worm of the worm shaft, and the handle is rotated operated The distance between the two blades can be easily adjusted, and the structure becomes simple.
[0017]
Further, the spring interposed arm support shaft under the wheel, removed backlash of the screw engagement of the wheel and the worm, thereby improving the accuracy of the blade spacing adjustment.
[0018]
【Example】
1 and 2 show an embodiment of a molten glass cutting device according to the present invention. FIG. 1 is a plan view thereof, and FIG. 2 is a cross-sectional view thereof.
[0019]
The molten glass cutting device (shear machine 1) according to the present invention includes a cutting unit 2 and a driving unit 3.
[0020]
The cutting part 2 supports a pair of arms 5 and 5 to which upper and lower blades 4a and 4b that operate symmetrically and open and close are attached, and a pair of arms 5 and 5 coaxially via a roller bearing 21 (FIG. 2). Arm support shaft 6 is provided. The arm support shaft 6 is provided with a blade interval adjusting mechanism 28 for adjusting the blade interval between both blades 4a and 4b.
[0021]
Blade gap adjustment mechanism 28 includes a wheel 18 which is fitted to the arm support shaft 6, a worm 19 which engages the wheel 18, of handles 20. attached to the worm shaft of the worm 19. The rotation of the wheel 18 moves the arm 5 of the upper blade 4a up and down along the arm support shaft 6, for example.
[0022]
Thereby, the space | interval of the both blades of the upper blade 4a and the lower blade 4b can be adjusted. Further, a disc spring 22 is interposed below the wheel 18 of the arm support shaft 6, and backlash due to screw engagement between the wheel 18 and the worm 19 is removed. These portions of the cutting portion 2 are supported by the cutting portion base A.
[0023]
The drive unit 3 includes a hydraulic rack and pinion mechanism 16, an eccentric plate 23 attached to the pinion shaft 15 of the hydraulic rack and pinion mechanism 16, a slide block 10 that slides with the rail 11 as a guide, and the slide The connecting rod 12 that connects the block 10 and the eccentric plate 23 is provided.
[0024]
As shown in FIG. 3, the hydraulic rack and pinion mechanism 16 includes a rack 25 built in the rack case and a pinion 24 that engages with the rack 25, and the pinion 24 extends from one end to the other end of the rack 25. Rotate once with the operation.
[0025]
Further, the rack 25 of the hydraulic rack and pinion mechanism 16 is provided with a hydraulic cushion 27 having both ends tapered, and the impact at the rack operating end is suppressed by the taper.
[0026]
FIG. 8 shows a hydraulic circuit of the hydraulic rack and pinion mechanism 16, oil chambers 16 A and 16 B are provided on both sides of the rack case, and both the oil chambers 16 A and 16 B have an oil pipe 34 having a gear box 31 and an orifice 32. And it connects with the oil piping 33 to bypass. The gear box 31 includes a gear pump and circulates oil. The gear box 31 is connected to an oil drain pipe and is provided with an air pot 26. The gear box 31 is configured to release the hydraulic pressure when the gear box 31 is subjected to a sudden hydraulic pressure and to discharge the drained oil.
[0027]
Referring back to FIGS. 1 and 2, the slide block 10 and the eccentric plate 23 that slide with the rail 11 as a guide are connected by a connecting rod 12 (12a, 12b) that can be divided into two. One end of the connecting rod 12 is pivotally attached to the slide block 10 by a connecting pin 13, and the other end is connected to an eccentric plate 23 by a crank pin 14. The eccentric plate 23 is rotationally driven by the rotation of the pinion shaft 15, and the crank pin 14 at the end of the connecting rod 12 is rotated by the rotational driving, whereby the connecting pin 13 at the other end of the connecting rod 12 is linearly moved back and forth. . Thereby, the slide block 10 moves back and forth. These portions of the drive unit 3 are supported by the drive unit base B.
[0028]
In the molten glass cutting apparatus (shear machine 1) according to the present invention, the cutting unit 2 and the driving unit 3 link both ends between the pair of arms 5 and 5 of the cutting unit 2 and the slide block 10 of the driving unit 3. A pair of arms 5 and 5 to which blades 4a and 4b are attached are connected by a link bar 8 supported by shafts 7 and 9 and driven by a drive unit 3, and can be moved by rotation from open to closed and from closed to open. It is the composition that.
[0029]
In this way, the linear motion of the rack 25 is converted into the rotational motion of the pinion 24, which is converted into linear motion by the connecting rod 12 via the eccentric plate 23 and the crank pin 14, and this linear motion is further converted by the link bar 8. It is converted into a rotary opening / closing operation of the arm 5.
[0030]
In the configuration of the present invention, the cutting part 2 and the driving part 3 are detachably coupled by a detachable bolt 17. In addition, since the connecting rod 12 (12a, 12b) for connecting the slide block 10 and the eccentric plate 23 can be divided into two parts, the cutting part 2 and the drive part 3 can be separated by first separating these parts, so that they can be replaced. (For example, replacement with an existing one) becomes possible.
[0031]
4A to 7J show the relationship between the driving of the hydraulic rack and pinion mechanism 16 and the opening and closing operations of the pair of arms 5 and 5 to which the blades 4a and 4b are attached.
[0032]
First, in a state where the blades 4a and 4b are opened to the maximum (initial position), the pinion 24 is located at one end (the lower end side in the figure) of the rack 25 (FIG. 4A). In this position, the crank pin 14 is located at the rearmost part (right end side in the figure).
[0033]
Next, when the rack 25 is moved downward as shown by the arrow l, the pinion 24 rotates counterclockwise as indicated by the arrow m, and the crank pin 14 rotates about the pinion shaft 15 to move the slide block 10 forward. It is moved (to the left in the figure) (FIG. 4B).
[0034]
As a result, both arms 5 rotate around the arm support shaft 6 in the opposing direction indicated by the arrow n via the link bar 8, and both blades 4a and 4b approach each other symmetrically toward the gob 30 (FIG. 4). (B)).
[0035]
Further, the pinion 24 rotates and the blades 4a and 4b approach each other to cut the gob 30. After cutting, the pinion 24 is rotated 180 ° with the blades 4a and 4b somewhat overlapping, and reaches the center position of the rack 25 (FIG. 4C). The center position of the rack is the dead center position of the blades 4a and 4b, and the blades 4a and 4b shift from the closing operation to the opening operation.
[0036]
At this dead center position, the rack 25 is in the middle of a stroke and continues to move linearly in the same direction. The pinion 24 is also rotating and continues to rotate in the same rotational direction. Therefore, the arm reversing operation is achieved in the process of smooth continuous operation without forming a discontinuous point of the operation accompanied by the impact by the conventional stopper at the reversing position (dead center position) of opening and closing the arms 5 and 5.
[0037]
Molten glass 3 0 blades 4a, when the pinion 24 is cut into 4b passes the center position of the rack 25, moves the slide block 10 blades 4a moves rearward, the arrow 0 direction 4b is opened (FIG. 5D). Since the switching of the operation of opening and closing the blades 4a and 4b is not switching by forced reversal as described above, there is no vibration due to switching of the operation. Therefore, there is no impact and vibration between the blades 4a and 4b, and the blades 4a and 4b are not worn, deteriorated, spilled, etc., and a good cutting operation can be obtained.
[0038]
When the pinion 24 comes to the other end of the rack 25, the blades 4a and 4b are opened to the maximum (FIG. 5E).
[0039]
At this point, then supplies the molten glass 3 0 of cutting, moves to the return operation of the rack 25 (FIG. 5 (F)).
[0040]
That is, from this point, when the rack 25 is moved in the direction of the arrow p (upward in the figure), the pinion 24 is rotated clockwise as indicated by the arrow q, and the slide block 10 is moved forward to move the blade 4a, 4b moves in the direction of the arrow r that closes (FIG. 4G).
[0041]
Center position of the pinion 24 is a rack 25 come into (dead center position), the blade 4a, 4b is closed completely, the molten glass 3 0 is cut (Fig. 6 (H)). The reversing operation at the dead center position is also a smooth operation with no impact in the middle of the stroke of the rack 25, similarly to the reversing operation at the position shown in FIG. molten glass 3 0 without is cut satisfactorily. Molten glass 3 0 blades 4a, pinion 24 is cut into 4b is past the center position of the rack 25, the blades 4a, 4b are moved in the direction of an arrow s which is opened (FIG. 6 (I)).
[0042]
Thereafter, the pinion 24 returns to the position of the first one end of the rack 25, and the blades 4a and 4b are opened to the maximum (FIG. 7J). That is, the state returns to the state of FIG.
[0043]
Repeat this operation, blades 4a, successively cutting the molten glass 3 0 4b.
[0044]
9 and 10 are operation curves comparing the shear machine of the present invention with a conventional shear machine.
[0045]
(A) is a full stroke curve with the operation start point as a reference, and (B) is a detail of the dead point portion.
[0046]
9A and 10A, the vertical axis S represents the distance of each blade from the dead point corresponding to the distance between both blades, and the right vertical axis D represents the diameter of the gob. Further, the horizontal axis represents the movement time of the blade, and the dead point position is set to 0 as the reference position.
[0047]
Also, (B), the vertical axis represents the moving distance of the blade, the horizontal axis represents the migration time of blade, the time reference point is the operation start time.
[0048]
A of FIG. 10 showing the conventional example, the speed v of the blade 2.7 m / s, air pressure _{P a} is 3 kg / cm @ 2, b is the velocity v of the blade 3.2 m / s, air pressure _{P a} is 4kg In the conventional operating curve of / cm 2, the dead point (DP) when the blade is closed results in a discontinuous movement with an angle due to the stopper abutment and forced reversal. Vibration is generated and variation occurs as indicated by the hatched portion. C in FIG. 10B indicates the ON time of the air supply solenoid valve.
[0049]
On the other hand, in FIG. 9d showing the present invention, the blade speed v is 4.4 m / s and the hydraulic pressure _Po is 30 kg / cm @ 2, and e is the blade speed v of 5.7 m / s and the hydraulic pressure _Po is 50 kg. The operating curve in the case of the present invention of / cm @ 2 is a smooth sine curve at the dead point (DP) when the blades 4a and 4b are closed, and no impact or vibration occurs after cutting. In addition, the blade pressure is large, the blade speed is increased, and the contact time with the gob is shortened. For example, in the case of cutting with a gob diameter of 100 mm, the contact time T is conventionally about 60 to 80 milliseconds (see FIG. 10A), but according to the present invention, the contact time T is about 50 to 70. The milliseconds can be reduced (see FIG. 9A), and the shear mark can be made smaller and shallower.
[0050]
Such an effect of shortening the contact time increases as the gob diameter increases. That is, the contact time is greatly shortened for a large diameter gob as compared with the conventional case.
[0051]
FIG. 9B shows the case where the hydraulic pressure is 20 kg / cm @ 2, 30 kg / cm @ 2 and 50 kg / cm @ 2, and the greater the cutting force, the faster the blade speed (response speed) and the time for contact with the gob. Shorter.
[0052]
In the case of the present invention, the use of the hydraulic rack and pinion mechanism 16 in this way eliminates the occurrence of shock and vibration, prevents blade spillage, suppresses wear and deterioration, prolongs the service life, and allows maintenance and parts replacement. The frequency is reduced and usability is improved. The hydraulic blade 4 a, the speed of 4b becomes faster become possible pressure cleavage can be shallower reduced shear marks becomes short contact time between the blade and the gob. In addition, combined with high pressure and high speed, it is possible to cut a gob having a large gob diameter.
[0053]
【The invention's effect】
As described above, according to the present invention, the pair of arms to which the blades are attached are operated smoothly from open to closed and from closed to open, so that impact and vibration are eliminated and blade spillage due to contact between the blades is eliminated. . Therefore, the service life is extended, the number of maintenance is reduced, and the productivity is improved. In addition, the blade can be thinned and good cutting can be performed. Further, the cutting force is increased, the blade speed is increased, the contact time with the gob is shortened, the molten glass is cut well, the shear mark is made small and shallow, the polishing time is shortened, and the productivity is improved. In addition, cutting of molten glass having a large gob diameter can be performed well.
[0054]
In addition, according to the present invention, since the cutting part and the driving part can be separated, the cutting part or the driving part can be easily replaced, for example, with an existing driving part.
[0055]
Moreover, according to the present invention, it is easy to adjust the distance between the blades, and the structure can be simplified.
[Brief description of the drawings]
FIG. 1 is a top view of an embodiment of a molten glass cutting device according to the present invention.
2 is a cross-sectional view of the apparatus of FIG.
FIG. 3 is a partial cross-sectional top view of a hydraulic rack and pinion mechanism.
FIG. 4 is a diagram showing a relationship between driving of a hydraulic rack and pinion mechanism and operation of a pair of arms attached with blades.
FIG. 5 is a diagram showing a relationship between driving of a hydraulic rack and pinion mechanism and operation of a pair of arms to which blades are attached.
FIG. 6 is a diagram showing the relationship between the driving of the hydraulic rack and pinion mechanism and the operation of a pair of arms to which blades are attached.
FIG. 7 is a diagram showing a relationship between driving of a hydraulic rack and pinion mechanism and operation of a pair of arms to which blades are attached.
FIG. 8 is a hydraulic circuit diagram of a hydraulic rack and pinion mechanism.
FIG. 9 is an operation curve diagram of the molten glass cutting device (shear machine) of the present invention.
FIG. 10 is an operation curve diagram of a conventional molten glass cutting device (shear machine).
[Explanation of symbols]
2: cutting part, 3: driving part, 4a, 4b: blade, 5: arm, 6: arm support shaft, 8: link bar, 10: slide block, 11: rail, 12, 12a, 12b: connecting rod, 15 : Pinion shaft, 16: Hydraulic rack and pinion mechanism, 18: Wheel , 19: Worm, 20: Handle, 22: Belleville spring, 23: Eccentric plate, 24: Pinion, 25: Rack, 28: Blade spacing adjustment mechanism, 30 : molten glass.

Claims (3)

A pair of arms that open and close symmetrically;
A blade for cutting molten glass attached to the tip of each arm;
An arm support shaft that coaxially supports the pair of arms;
A hydraulic rack and pinion mechanism in which the pinion rotates once by movement from one end of the rack to the other end;
An eccentric plate attached to the pinion shaft of the hydraulic rack and pinion mechanism;
A slide block that slides with the rail as a guide;
A connecting rod for connecting the eccentric plate and the slide block;
A link bar that connects the slide block and the pair of arms to operate the blade from open to closed and from closed to open;
Configured to continuously operate the blade from open to closed and from closed to open during one rotation of the pinion ;
A wheel connected to one arm of the pair of arms is attached to the arm spindle,
A blade spacing adjustment mechanism comprising a worm engaged with the wheel and a handle attached to the worm shaft of the worm;
A molten glass cutting apparatus comprising a backlash removing spring that engages with the wheel .   The molten glass cutting device according to claim 1, wherein the cutting unit including the blade, the arm, and the arm support shaft and the driving unit including the rack and pinion mechanism can be divided.   The molten glass cutting apparatus according to claim 2, wherein the connecting rod is divided into two parts so that the cutting part and the driving part can be separated.

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