JP3592613B2 - Plunger - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a plunger which is a part of a glass bottle forming facility and is set at a lower portion of a rough mold by forming a glass bottle by a blow-and-blow method and forms an inner surface of a mouth of a parison.
[0002]
[Prior art]
Referring to FIGS. 5 and 6 , an outline of a process of forming a glass bottle by a conventional blow-and-blow method will be described. In FIGS. 5 a to 5 c, a parison P as a semi-finished product is manufactured from a molten glass lump (gob) G using a rough mold 20. In Figure 5 a, the gob G is turned into a blank mold 20, FIG. 5 b in pressurized with compressed air from above through the baffle 1 (Settsuruburo), and glass enters the mouth die 21 at the bottom of the blank mold 20 A mouth is made. At this time, the plunger 1 is set at a predetermined position. In Figure 5 c, the plunger 1 is lowered, blowing air into the cavity (counterblow), the parison P is molded in the rough mold 20 and an upper baffle 22. Figure 6 illustrates in some detail the apparatus of an intermediate state of FIG. 5 b and c. In the figure, the plunger 1 is set at a predetermined position, and the baffle 22 is set on the upper part of the rough mold 20. Thereafter, the plunger 1 is lowered, and the counter blow is performed. In Figure 5 d, transferred parison P to reversing apparatus (mechanism) 26 blow mold 24 was used to mold the glass bottle B as a final product in Fig. 5 e to f in the blow mold within 24 (final blowing), In Figure 5 g taken out glass bottles B from the blow mold 24.
[0003]
FIG. 4 is a central longitudinal sectional view of a conventional plunger. In the figure, the upper part of the plunger 1 is a bullet-shaped head 4 and the lower part is an edge 6. The portion above the edge 6 is a portion that comes into contact with the glass during settling blow, and the edge 6 is a boundary between a portion that comes into contact with the glass and a portion that does not come into contact with the glass. At the lower end of the plunger 1, there is provided a mounting portion 10 to be attached to a lifting drive means such as a cylinder. An air passage 13 is bored from below in the inside, and an air hole 9 is provided to communicate the air passage 13 with the outside. Compressed air is supplied from the air passage 13 and the air hole 9 during counter blowing.
[0004]
[Problems to be solved by the invention]
Since the conventional plunger is integrally formed by casting, there is a problem that the heat of the glass is easily taken away. As a result, the temperature of the glass at the mouth of the parison decreases, thermal stress is generated in the glass, the viscosity of the glass increases, and the glass at the mouth is pulled when the plunger descends. (Cracks on the inside of the part). " Further, the vibration transmitted from the lifting drive means when the plunger is lowered also causes the occurrence of "sky".
[0005]
An object of the present invention is to provide a plunger that does not easily generate “sky”.
[0006]
[Means for Solving the Problems]
The present invention relates to a plunger for forming an inner surface of a mouth of a parison by molding a glass bottle by a blow-and-blow method, wherein a tip portion and a main body portion are formed near an edge which is a boundary between a portion to be in contact with glass and a portion not to be contacted. The tip portion has a shell-shaped head and a shaft portion having a diameter smaller than the diameter of the lower end of the head formed to protrude below the head portion, and the main body portion has an upper portion. A concave portion into which the shaft portion of the distal end portion is inserted. The distal end portion is detachably attached to the main body portion by inserting the shaft portion into the concave portion, and the diameter of the shaft portion is reduced by the concave portion. The tip of a retaining pin inserted from the outside of the main body portion is engaged with a concave portion provided on the side surface of the shaft portion, and the concave portion is a tip of the retaining pin. Is slightly larger than before It is plunger, wherein the tip portion is slightly movable loosely coupled in the vertical and horizontal directions relative to the body portion. That is, the tip and the body are manufactured separately, and then the tip is attached to the top of the body. In the plunger of the present invention, since the distal end is separate from the main body, heat is hardly transmitted from the distal end to the main body (hard to escape), and the temperature of the portion of the head in contact with the glass increases. . For this reason, the temperature drop of the glass at the mouth is reduced, the occurrence of thermal stress is reduced, the increase in the viscosity of the glass is suppressed, and the tendency of pulling the glass at the mouth when the plunger descends is reduced. , The drawback of "Tenbiri" is less likely to occur.
[0007]
It is desirable that the boundary between the distal end portion and the main body portion is at the same position as the edge or slightly below the edge. In this case, since the glass does not touch the boundary, there is no possibility that the boundary line will appear at the mouth.
[0008]
Tip that is attached slightly movable loose in the vertical direction and the horizontal direction with respect to the main body portion (with play). In this case, the impact on the glass when the plunger is lowered is reduced, and the vibration of the lifting / lowering driving means is less likely to be transmitted to the distal end portion, so that “sky rumble” is further reduced.
[0009]
Since the tip has a shank with a diameter smaller than the diameter of the lower end of the head, formed at the lower part of the shell-shaped head, and formed with a recess at the upper part of the main body, the shank is inserted. By fitting the shaft into the recess, the tip can be easily attached to the main body.
[0010]
The outer diameter of the shaft portion slightly smaller than the inner diameter of the recess, recessed engagement portion on the side surface of the shaft portion, for engaging the tip of the pinning it exits inserted from the outside of the main body portion in the recess. The recess is formed slightly larger than the tip of the retaining pin. With this configuration, the distal end portion is loosely coupled to the main body portion so as to be finely movable vertically and horizontally.
[0011]
Further, the concave portion may be a circumferential groove formed over the entire circumference of the shaft portion. If the width of the peripheral groove is slightly wider than the diameter of the tip of the retaining pin, the tip can be finely moved in the vertical and horizontal directions with respect to the main body, and can rotate, so that the glass when the plunger descends Is further reduced. Further, when attaching the distal end portion to the main body, the retaining pin can be easily engaged with the concave portion regardless of the orientation of the distal end portion.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing examples. Figure 1 is a top view of the plunger of the embodiment, FIG. 2 is sectional view taken along the line AA in FIG. 1, FIG. 3 is a side view of the distal end portion 2.
[0013]
A plunger 1 shown in FIGS. 1 and 2 includes a distal end 2 and a main body 3. The boundary between the tip 2 and the main body 3 is slightly below the edge 6. As shown in FIG. 3, the distal end portion 2 is formed with a shaft portion 5 having an outer diameter a protruding below the shell-shaped head portion 4. The outer diameter a of the shaft 5 is smaller than the diameter of the lower end of the head 4. An engaging portion 7 is provided in a side surface of the shaft portion 5. The engaging portion 7 is a circumferential groove, and its width b is slightly larger than the diameter of the tip of the retaining pin 11. Therefore, the distal end portion 2 can be finely moved about 0.2 mm in the vertical direction with respect to the main body portion 3 and can rotate.
[0014]
The main body 3 has a cylindrical shape, and the upper portion is a concave portion 8 into which the shaft portion 5 of the distal end portion 2 is inserted. The concave portion 8 is a through hole that also serves as an air passage and extends over the entire length. The inner diameter of the recess 8 is larger than the outer diameter a of the shaft 5 by 0.06 mm. For this reason, the tip 2 can be slightly moved by 0.06 mm in the horizontal direction with respect to the main body 3. Four air holes 9 are provided to communicate the recess 8 with the outside. Compressed air is supplied from the air passage 13 and the air hole 9 during counter blowing. The side face is provided with two pin holes for retaining pins. At the lower part, a mounting portion 10 for mounting to a lifting drive means such as a cylinder is formed.
[0015]
The distal end portion 2 is attached to the main body portion 3 by inserting the shaft portion 5 into the concave portion 8 as shown in FIG. Further, the retaining pin 11 is screwed into the pin hole, and the distal end of the retaining pin 11 is engaged with the engaging portion 7, whereby the distal end portion 2 is prevented from being pulled out from the main body 3. The tip 2 is detachable from the main body 3.
[0016]
In the plunger 1 of FIGS. 1 and 2, since the main body and the tip are separate bodies, the heat of the glass received by the head 4 is not easily transmitted to the main body, and the temperature of the head 4 increases. When the temperature during operation of the head 4 of the plunger of this example was measured, the temperature was 605 ° C. at the top and 573 ° C. at the edge 6. When the temperature of the head of the conventional plunger of FIG. 5 was measured under the same conditions, the head was 537 ° C. and the edge 6 was 422 ° C. The plunger of this embodiment has an average temperature of the head of about 110 ° C. higher than that of the conventional plunger, and the temperature difference between the top and the edge is reduced to 83 ° C. from 115 ° C. to 32 ° C. For this reason, generation | occurrence | production of a thermal stress can be eased and generation | occurrence | production of "bill" can be prevented. Further, since the distal end portion 2 can be finely moved in the vertical and horizontal directions with respect to the main body portion 3 and is rotatable, it is possible to prevent the occurrence of “sky” due to an impact when the plunger is lowered.
[0017]
【The invention's effect】
Since the temperature of the head is high and the temperature difference between the crown and the edge is small, the plunger according to the present invention can prevent the occurrence of “sky swelling” due to thermal stress or glass viscosity. Further, by making the distal end portion finely movable in the vertical and horizontal directions with respect to the main body portion and by being rotatable, it is possible to prevent the occurrence of “sky swelling” due to an impact when the plunger is lowered. Furthermore, the tip portion is detachable from the main body, it becomes possible to mold other types of glass bottles only replace the tip, Also, when the head of the tip is worn Since only the tip portion needs to be replaced, the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a top view of a plunger 1 according to an embodiment.
FIG. 2 is a sectional view taken along line AA in FIG.
FIG. 3 is a side view of the tip 2;
FIG. 4 is a longitudinal sectional view of a conventional plunger 1.
FIG. 5 is an explanatory diagram of glass bottle molding by a blow and blow method.
FIG. 6 is an explanatory diagram of parison molding.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plunger 2 Tip part 3 Main part 4 Head 5 Shaft 6 Edge 7 Engaging part 8 Depression 9 Air hole 10 Mounting part 11 Retaining pin 13 Airway 20 Rough mold 21 Mouth mold 22 Baffle 23 Guide ring 24 Finishing mold 25 bottom type

Claims (2)

In a plunger that forms the inner surface of the mouth of a parison by molding a glass bottle by blow-and-blow method, the tip and main body are separated into upper and lower parts near the edge, which is the boundary between the part that contacts and the part that does not contact the glass. The tip portion has a shell-shaped head and a shaft portion having a diameter smaller than the diameter of the lower end of the head protrudingly formed below the head portion, and the main body portion has the tip portion at the upper portion. Has a concave portion into which the shaft portion is inserted. The distal end portion is detachably attached to the main body portion by inserting the shaft portion into the concave portion, and the diameter of the shaft portion is larger than the inner diameter of the concave portion. The tip of the retaining pin inserted from the outside of the main body portion is engaged with a concave portion provided on the side surface of the shaft portion, and the concave portion is slightly larger than the distal end of the retaining pin. And the tip is Plunger, characterized in that it is slightly movable loosely coupled in the vertical direction and the horizontal direction with respect to the serial body portion 2. The plunger according to claim 1, wherein the recess is a circumferential groove formed over the entire circumference of the shaft portion, the width of the circumferential groove is slightly wider than the diameter of the tip of the retaining pin, and the tip portion is Plunger characterized by being rotatable with respect to the main body

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