JP2001328822A - Plunger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate top checks by improving a plunger. SOLUTION: This plunger is formed by separating the plunger into a tip part and a body part at the vicinity of an edge which is a boundary of a part contacting with the glass and a part not contacting with the glass. As a result, the heat transmission from the tip part to the body part becomes difficult to heighten the temperature of the part contacting with the glass, at the head part. Accordingly, the temperature reduction of the glass at the mouth part is decreased to reduce the generation of thermal stress, and also to suppress the increase of the viscosity of the glass, to reduce the tendency of pulling the glass of the mouth part when lowering the plunger, and, as a result, to eliminate the fault of the top check.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a part of a glass bottle forming equipment, which is a plan for forming the inner surface of a parison mouth by setting the lower part of a rough mold by forming a glass bottle by a blow and blow method. About jars.

[0002]

2. Description of the Related Art An outline of a process for forming a glass bottle by a conventional blow-and-blow method will be described with reference to FIGS. 6a to 6c, a parison P as a semi-finished product is manufactured from a lump (gob) G of molten glass using a rough mold 20. In FIG. 6A, the gob G is put into the rough mold 20, and FIG.
In b, it is pressurized with compressed air from above through the baffle 1 (settle blow), and the glass enters the mouth mold 21 below the rough mold 20 to form a mouth. At this time plunger 1
Is set at a predetermined position. In FIG. 6c, the plunger 1 is lowered, air is blown into the cavity (counter blow), and the parison P is formed by the rough mold 20 and the upper baffle 22. FIG. 7 shows the device in an intermediate state between FIGS. 6b and 6c in somewhat more detail. 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 descends and the counter blow is performed. In FIG. 6d, the parison P is transferred to the finishing mold 24 using the reversing device (mechanism) 26. In FIGS. 6e to 6f, the glass bottle B as a final product is formed in the finishing mold 24 (final blowing), and FIG. Then, the glass bottle B is taken out from the finishing die 24.

FIG. 5 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 an attachment portion 10 to be attached to a lifting drive means such as a cylinder. An air passage 13 is formed in the inside from the lower side, 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 holes 9 during counter blowing.

[0004]

Since the conventional plunger is integrally formed by casting, there is a problem that heat of the glass is easily taken away. For this reason, 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 rumble".

An object of the present invention is to provide a plunger that is unlikely to cause "sky".

[0006]

According to the present invention, there is provided a plunger for forming an inner surface of a mouth portion of a parison by forming a glass bottle by a blow-and-blow method. A plunger characterized in that the plunger is formed separately in the vicinity of a distal end portion and a main 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 decreases, the occurrence of thermal stress decreases, the increase in the viscosity of the glass is suppressed, and the tendency of pulling the glass at the mouth when the plunger descends decreases. , And the disadvantage of “Tenbiri” is less likely to occur.

It is desirable that the boundary between the tip portion and the main body is at the same position as the edge or slightly below the edge. In this case, the glass does not touch the border,
There is no danger of the border line appearing at the mouth.

It is desirable that the tip is loosely attached (with asobi) to the main body so as to be finely movable vertically and horizontally. In this way, the impact on the glass when the plunger is lowered is reduced, and the vibration of the lifting / lowering drive means is less likely to be transmitted to the tip,
"Tenbiri" is less likely to occur.

The distal end has a projecting portion having a diameter smaller than the diameter of the lower end of the head protrudingly formed below the shell-shaped head, and a concave portion into which this shaft is inserted is formed above the main body. Then, the tip can be easily attached to the main body by fitting the shaft into the recess.

In this case, the outer diameter of the shaft is made slightly smaller than the inner diameter of the recess, the engaging portion is recessed on the side surface of the shaft, and the tip of the retaining pin inserted from the outside of the main body into this recess. Engage. 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 in the vertical and horizontal directions.

Further, the recess may be a circumferential groove formed over the entire circumference of the shaft portion. If the width of the circumferential 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 be rotated, and the glass when the plunger descends Is further reduced. Further, when attaching the distal end to the main body, the retaining pin can be easily engaged with the concave portion regardless of the orientation of the distal end.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. FIG. 1 is a top view of the plunger of the embodiment, FIG. 2 is a sectional view taken along line AA in FIG.
Is a side view of the distal end portion 2, and FIG. 4 is a longitudinal sectional view of a plunger of another embodiment.

A plunger 1 shown in FIGS. 1 and 2 comprises a tip 2 and a main body 3. The boundary between the tip 2 and the 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 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 on a side surface of the shaft portion 5.
Is recessed. 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. For this reason, the front end portion 2 is vertically
It is finely movable by about mm and is rotatable.

The main body 3 has a cylindrical shape, and the upper part is a concave part 8 into which the shaft part 5 of the distal end part 2 is inserted. The concave part 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 is 0.06 mm in the horizontal direction with respect to the main body 3.
Fine movement is possible. The recess 8 communicates with the outside and the air holes 9
There are two places. Compressed air is supplied from the air passage 13 and the air holes 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.

The tip 2 is attached to the main body 3 by inserting the shaft 5 into the recess 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.

In the plunger 1 shown in FIGS. 1 and 2, since the main body and the tip are separate bodies, the heat of the glass received at 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 embodiment was measured, the temperature was 605 ° C. at the top and 573 ° C. at the edge 6. The temperature of the head of the conventional plunger shown in FIG. 5 was measured under the same conditions.
2 ° C. The plunger of this embodiment has an average head temperature of about 110 ° C. higher than that of the conventional plunger,
83 ° C from 115 ° C to 32 ° C between head and edge
Is also shrinking. Therefore, the occurrence of thermal stress can be reduced,
It is possible to prevent the occurrence of “heavenly fray”. The tip 2 is finely movable vertically and horizontally with respect to the main body 3.
In addition, since the plunger is rotatable, it is possible to prevent the occurrence of “sky” due to an impact when the plunger is lowered.

The plunger 1 shown in FIG. 4 is an example in which a retaining mechanism is different from that of the above embodiment. In the above-described embodiment, the tip 2 is finely movable in the vertical and horizontal directions with respect to the main body 3 and is rotatable, and the tip 2 is detachable from the main body 3. Is the same as The lower end of the shaft portion 5 is a male screw portion 14, and a retaining nut 12 is screwed thereto. Retaining nut 12
And a ceiling c of the air passage 13. Therefore, the distal end portion 2 can finely move in the vertical direction by c.

[0018]

The plunger of the present invention has a high head temperature and a small temperature difference between the crown and the edge.
It is possible to prevent the occurrence of “brightness” due to thermal stress or glass viscosity. In addition, 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” due to an impact when the plunger is lowered. Furthermore, since the tip can be detachably attached to the main body, other types of glass bottles can be formed simply by replacing the tip, and 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 distal end portion 2;

FIG. 4 is a longitudinal sectional view of a plunger 1 according to another embodiment.

FIG. 5 is a longitudinal sectional view of a conventional plunger 1.

FIG. 6 is an explanatory diagram of glass bottle molding by a blow and blow method.

FIG. 7 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 part 6 Edge 7 Engaging part 8 Concave part 9 Air hole 10 Attachment part 11 Retaining pin 12 Retaining nut 13 Airway 14 Male screw part 20 Coarse type 21 Mould 22 Baffle 23 Guide ring 24 Finish type 25 Bottom type

Claims (6)

[Claims] 1. 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 which does not contact the glass and a portion which does not contact the glass. Characterized in that the plunger is divided into upper and lower parts separately. 2. The plunger according to claim 1, wherein a boundary between the tip and the main body is an edge or slightly below the edge. 3. The plunger according to claim 1, wherein the tip is loosely attached to the main body so as to be finely movable in the vertical and horizontal directions. 4. The plunger according to claim 1, 2 or 3, wherein the tip has a bullet-shaped head and a shaft having a diameter smaller than a diameter of a lower end of the head protruding below the head. The main body has an upper portion having a concave portion into which the shaft of the distal end portion is inserted, and the distal end portion is detachably attached to the main body portion by inserting the shaft portion into the concave portion. Characteristic plunger 5. The plunger according to claim 4, wherein the diameter of the shaft is slightly smaller than the inner diameter of the recess, and a retaining pin inserted from the outside of the body into the side surface of the shaft. A mating engagement portion is formed in a recess, and the recess is formed slightly larger than the tip of the retaining pin, and the tip is loosely coupled to the main body so as to be finely movable in the vertical and horizontal directions. Plunger characterized by the following: 6. The plunger according to claim 5, wherein the recess is a circumferential groove formed over the entire circumference of the shaft portion, and the width of the circumferential groove is slightly larger than the diameter of the tip of the retaining pin. The plunger, wherein the tip is rotatable with respect to the main body.