Bottle blowing gas discharging device in rotary bottle blowing machine

Abstract

The utility model discloses a discharge device for bottle blowing gas in a rotary bottle blowing machine, which comprises a blowing head, a bottle blowing mould capable of being opened and closed is arranged below the blowing head, a vent hole for communicating a mould cavity with the outside is arranged at the bottom of the bottle blowing mould, a vent head is arranged in the vent hole through a vent cover, a vent spring is sleeved on the vent head, and a gas outlet is arranged on the vent hole. When the blowing head blows a bottle preform, the exhaust head can automatically exhaust gas in the die cavity through the exhaust hole by means of pressure difference. According to the utility model, the exhaust hole and the air inlet hole are arranged, so that during bottle blowing, a bottle preform is gradually blown up, the temperature is gradually increased, the air pressure in the die cavity is increased, the exhaust head is pushed to move downwards, and the air in the die cavity is automatically exhausted; at the moment of demolding, the mold is opened suddenly, the space around the mold cavity is enlarged, the pressure intensity is reduced, the air inlet head moves upwards, air enters the air inlet head, and a blown bottle is prevented from being extruded to deform or attached to the inner wall of the mold cavity of the mold.

Description

Technical Field

[0001] The utility model relates to the technical field of blowing gas discharge for blowing bottles, in particular to a device for discharging blowing gas in a rotary bottle blowing machine. Background Technique

[0002] All kinds of bottles are blown from preforms in molds. The quality of the mold and the standardization of bottle blowing are crucial to the quality of the final bottle.

[0003] The existing molds lack an exhaust structure. During the process of blowing the preform into a bottle by the bottle blowing machine, the preform is small and the mold cavity is large. When the mold closes, some gas will accumulate in the mold cavity. During the bottle blowing process, the preform is gradually blown into a bottle, and the accumulated gas and the gradually expanding bottle will squeeze each other, resulting in the blown bottle being easily deformed by the gas extrusion. At the same time, when demolding, the gas outside the mold cavity cannot enter in time or can only enter the mold cavity from the mold joint, resulting in difficult demolding and easy deformation of the bottle. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a device for discharging blowing gas in a rotary bottle blowing machine, aiming to solve the technical problem that the gas in the mold cavity cannot be discharged or entered in time in the prior art.

[0005] To achieve the above purpose, the utility model provides a device for discharging blowing gas in a rotary bottle blowing machine, including a blowing head. A blow mold that can be opened and closed is provided below the blowing head. An exhaust hole communicating the mold cavity with the outside is provided at the bottom of the blow mold. An exhaust head is installed in the exhaust hole through an exhaust hood. An exhaust spring is sleeved on the exhaust head. When the blowing head blows the preform, the exhaust head can automatically discharge the gas in the mold cavity through the exhaust hole by the pressure difference.

[0006] Further, an air inlet hole communicating the mold cavity with the outside is provided on the side wall of the mold. An air inlet head is installed in the air inlet hole through a cover plate. An air inlet spring is sleeved on the air inlet head;

[0007] An air inlet hole is provided on the air inlet head for automatic air intake during demolding.

[0008] Further, a retaining piece is provided on the exhaust head;

[0009] The exhaust head is installed on the mold through an exhaust hood, and the exhaust spring is sleeved between the retaining piece and the exhaust hood.

[0010] Further, a funnel-shaped head is provided on the exhaust head, and a funnel-shaped hole adapted to the funnel-shaped head is provided on the exhaust hood. The funnel-shaped head can be movably installed in the funnel-shaped hole.

[0011] Further, a trapezoidal hole is provided on the mold and the cover plate, and a trapezoidal head b is provided on the air inlet head. The trapezoidal head b is movably installed in the trapezoidal hole.

[0012] The beneficial effects of the present utility model are embodied in:

[0013] In the present utility model, an exhaust hole and an air inlet hole are provided. When blowing a bottle, the bottle preform is gradually blown up and the temperature gradually rises. The air pressure in the mold cavity becomes larger, pushing the exhaust head downward to automatically discharge the gas in the mold cavity. At the moment of demolding, the mold is suddenly opened, the space around the mold cavity becomes larger, the pressure becomes smaller, the air inlet head moves upward, and the gas enters, so that the blown bottle is not squeezed and deformed or adhered to the inner wall of the mold cavity. Description of the Drawings

[0014] Figure 1 is the overall structural schematic diagram of the present utility model;

[0015] Figure 2 is the semi-mold structural schematic diagram of the present utility model;

[0016] Figure 3 is the internal structural schematic diagram of the exhaust hole and the air inlet hole of the present utility model;

[0017] Figure 4 is Figure 3 the front view of;

[0018] Figure 5 is Figure 3 the exploded view of.

[0019] Description of the Reference Numerals:

[0020] 1. Blowing head, 2. Mold, 2a. Mold cavity, 3. Exhaust hole, 4. Exhaust head, 5. Exhaust spring, 6. Flap, 7. Air inlet hole, 8. Air inlet head, 8a. Air inlet, 8b. Trapezoidal head, 9. Air inlet spring, 10. Exhaust hood, 11. Cover plate, 10a. Hopper-shaped hole. Specific Embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0023] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, "a plurality" means more than two. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist.

[0024] See Figures 1 to 5 As shown, a device for discharging blowing gas in a rotary blow molding machine of the present utility model includes a blow head 1. A blow molding mold 2 that can be opened and closed is provided below the blow head 1. An exhaust hole 3 communicating the mold cavity 2a with the outside is provided at the bottom of the blow molding mold 2. An exhaust head 4 is installed in the exhaust hole 3 through an exhaust hood 10. An exhaust spring 5 is sleeved on the exhaust head 4. When the blow head blows the bottle preform, the exhaust head 4 can automatically discharge the gas in the mold cavity 2a through the exhaust hole 3 due to the pressure difference.

[0025] Working principle

[0026] When the blow head extends into the bottle preform and blows the bottle in the mold cavity, as the bottle preform is gradually blown into a bottle, the bottle squeezes the mold cavity space. At the same time, the blow head heats the air in the mold cavity, resulting in an increase in the pressure in the mold cavity, which pushes the exhaust head downward and automatically discharges the gas in the mold cavity, thus preventing the gas in the mold cavity from crushing the bottle.

[0027] When the mold is opened, the mold is suddenly opened, and the pressure in the mold cavity becomes smaller. External gas surges in. An air inlet hole is provided. When demolding, the air inlet head can be pushed up by the air, sucking in the external gas, preventing the blown bottle from sticking to the mold and also preventing the blown bottle from being crushed by the gas in the mold gap.

[0028] In some embodiments, see Figure 1As shown, an air inlet hole 7 communicating the mold cavity 2a on the side wall of the mold 2 with the outside is provided. An air inlet head 8 is installed in the air inlet hole 7 through a cover plate 11, and an air inlet spring 9 is sleeved on the air inlet head 8;

[0029] An air inlet hole 8a is provided on the air inlet head 8 for automatically admitting air during demolding.

[0030] In some embodiments, as shown in Figure 1 A retaining piece 6 is provided on the exhaust head 4;

[0031] The exhaust head 4 is installed on the mold 2 through an exhaust hood 10, and the exhaust spring 5 is sleeved between the retaining piece 6 and the exhaust hood 10.

[0032] In some embodiments, as shown in Figure 1 A bucket-shaped head is provided on the exhaust head 4, and a bucket-shaped hole 10a adapted to the bucket-shaped head is provided on the exhaust hood 10. The bucket-shaped head is movably installed in the bucket-shaped hole 10a.

[0033] In some embodiments, as shown in Figure 1 A trapezoidal hole is provided on the mold 2 and the cover plate 11, and a trapezoidal head 8b is provided on the air inlet head 8. The trapezoidal head 8b is movably installed in the trapezoidal hole.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for discharging blowing gas in a rotary bottle blowing machine, comprising a blowing head (1), wherein a bottle blowing mold (2) which can be opened and closed is provided below the blowing head (1), characterized in that The bottom of the bottle blowing mold (2) is provided with an exhaust hole (3) which connects the mold cavity (2a) with the outside world. The exhaust hole (3) is equipped with an exhaust head (4) through an exhaust cover (10). The exhaust head (4) is provided with an exhaust spring (5). When the blowing head (1) blows the bottle embryo, the exhaust head (4) can automatically discharge the gas in the mold cavity (2a) through the exhaust hole (3) by pressure difference.

2. The device for discharging blowing gas in a rotary bottle blowing machine according to claim 1, characterized in that: An air inlet hole (7) is provided on the side wall of the mold (2) for connecting the mold cavity (2a) with the outside, an air inlet head (8) is installed in the air inlet hole (7) through a cover plate (11), and an air inlet spring (9) is mounted on the air inlet head (8); The air inlet head (8) is provided with an air inlet hole (8a) for automatic air inlet during demoulding.

3. The device for discharging blowing gas in a rotary bottle blowing machine according to claim 1, characterized in that: The exhaust head (4) is provided with a baffle (6); The exhaust head (4) is installed on the mold (2) through the exhaust cover (10), and the exhaust spring (5) is sleeved between the baffle (6) and the exhaust cover (10).

4. The device for discharging blowing gas in a rotary bottle blowing machine according to claim 2, characterized in that: The exhaust head (4) is provided with a bucket-shaped head, the exhaust cover (10) is provided with a bucket-shaped hole (10a) adapted to the bucket-shaped head, and the bucket-shaped head can be moved downward and installed in the bucket-shaped hole (10a).

5. The device for discharging blowing gas in a rotary bottle blowing machine according to claim 2, characterized in that: The mold (2) and the cover plate (11) are provided with a trapezoidal hole, and the air inlet head (8) is provided with a trapezoidal head (8b), and the trapezoidal head (8b) is installed in the trapezoidal hole in a manner that it can move downward.

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