An assembly structure of cavity forming parts applied to a preform mold

Abstract

A total structure of a cavity forming part applied to a preform mold, including a preform cavity and a cavity exhaust structure formed by combining a core seat, a cavity, a die lip, a core, and a cavity bottom. The cavity exhaust structure includes an air outlet channel, an axial exhaust channel formed by the cooperation of the core and the core seat, a gas gathering groove arranged at one end where the core seat and the die lip cooperate, and an end face exhaust surface. The air outlet channel includes an air outlet hole on the core seat and a die lip exhaust groove on the die lip. The two ends of the axial exhaust channel are respectively communicated with the air outlet hole and the preform cavity. A ventilation channel communicating the gas gathering groove and the air outlet hole is arranged on the core seat. The preform cavity, the end face exhaust surface, the gas gathering groove, and the die lip exhaust groove are communicated in sequence from the inside to the outside. The present invention can enhance the exhaust capacity of the preform cavity, accelerate the exhaust speed of the preform cavity, solve the problems such as the increase of injection resistance caused by the backlog of the cavity, the difficulty in forming at the bottle mouth, the unqualified product quality, and the long production cycle.

Description

Technical Field

[0001] The present invention relates to the field of preform molds, and particularly to an assembly structure of cavity forming parts applied to preform molds. Background Art

[0002] When the existing PET preform mold injects preforms, the raw material enters from the bottom of the cavity, and the gas is squeezed by the raw material and sequentially passes through the bottom cavity, body cavity, mouth cavity, and bottle mouth groove of the preform cavity, and then is discharged to the outside of the preform mold. However, problems such as insufficient exhaust area and incorrect exhaust direction in the mouth cavity part and bottle mouth groove of the existing preform mold are likely to cause pressure loss and gas accumulation. Therefore, when the mold is trial-produced or in production, the phenomenon of insufficient filling of the raw material of the product often occurs, seriously affecting the production efficiency and production quality.

[0003] Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an assembly structure of cavity forming parts applied to preform molds.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] An assembly structure of cavity forming parts applied to preform molds, including a preform cavity and a cavity exhaust structure formed by combining a core seat, a cavity, a die lip, a core, and a cavity bottom. The cavity exhaust structure includes an air outlet channel for exhausting to the outside, an axial exhaust channel formed by the cooperation of the core and the core seat, a gas gathering groove and an end face exhaust surface provided at one end where the core seat and the die lip are in cooperation. The air outlet channel includes an air outlet hole on the core seat and a die lip exhaust groove on the die lip. The two ends of the axial exhaust channel are respectively communicated with the air outlet hole and the preform cavity. A ventilation channel communicating the gas gathering groove and the air outlet hole is provided on the core seat, and the preform cavity, the end face exhaust surface, the gas gathering groove, and the die lip exhaust groove are communicated in sequence from inside to outside.

[0007] In the present invention, the end face exhaust surface is arranged at the parting surface between the bottle mouth groove of the core seat and the die lip.

[0008] In the present invention, the end face exhaust surface is of an annular structure.

[0009] In the present invention, the end face exhaust surface is composed of several arc channels with an arc groove cross-section structure. The several arc channels extend and diverge from the normal direction of the axis to the outside and are arranged in an annular distribution.

[0010] In the present invention, the gas gathering groove covers the entrance of the die lip exhaust groove.

[0011] In the present invention, the groove width of the gas gathering groove is not less than 1 mm, and the depth is not less than 0.5 mm.

[0012] In the present invention, the gas accumulation groove is of an annular structure.

[0013] In the present invention, the axial plane A of the ventilation channel is internally tangent to the minor diameter of the annular gas accumulation groove.

[0014] In the present invention, the diameter of the ventilation channel is greater than the groove width of the gas accumulation groove.

[0015] In the present invention, the axis of the ventilation channel is parallel to the conical surface of the mold core base.

[0016] Advantages of the present invention: Through the above-mentioned mold cavity exhaust structure, when the raw material is injected into the preform mold cavity, part of the gas in the preform mold cavity passes through the axial exhaust channel and is discharged through the air outlet channel, and the other part is discharged through the end face exhaust surface, through the gas accumulation groove, through the ventilation channel, the air outlet hole and the mold lip exhaust groove in a split manner, thereby enhancing the exhaust capacity of the preform mold cavity, accelerating the exhaust speed of the preform mold cavity, and solving the problems such as increased injection resistance caused by mold cavity backlog, difficult molding at the bottle mouth, unqualified product quality, and long production cycle. Description of the Drawings

[0017] The present invention will be further described below in conjunction with the drawings and embodiments:

[0018] Figure 1 It is a schematic internal structure diagram of Embodiment 1;

[0019] Figure 2 It is Figure 1 A directional structure diagram of

[0020] Figure 3 It is a schematic internal structure diagram of Embodiment 1 from another angle;

[0021] Figure 4 It is Figure 3 A directional structure diagram of

[0022] Figure 5 It is a schematic internal structure diagram of the mold core base of Embodiment 1;

[0023] Figure 6 It is Figure 5 The left view of

[0024] Figure 7 It is a schematic internal structure diagram of the mold core base of Embodiment 2;

[0025] Figure 8 It is Figure 7 The left view of Specific Embodiments

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0027] Example 1

[0028] Reference Figures 1 - 6 A cavity molding component assembly structure for a preform mold includes a preform mold cavity formed by a core seat 1, a mold cavity 2, a mold lip 3, a mold core 4, and a mold cavity bottom 5, and a mold cavity exhaust structure. The mold cavity exhaust structure includes an exhaust channel 6 for exhausting to the outside, an axial exhaust channel 7 formed by the mold core 4 and the core seat 1, a gas collection groove 8 provided at one end of the core seat 1 and the mold lip 3, and an end face exhaust surface 9. The exhaust channel 6 includes an exhaust hole 61 on the core seat 1 and a lip exhaust groove 62 on the mold lip 3. The two ends of the axial exhaust channel 7 are connected to the exhaust hole 61 and the preform mold cavity, respectively, allowing gas to flow outward. The core seat 1 is provided with a ventilation channel 11 connecting the gas collection groove 8 and the exhaust hole 61. The preform mold cavity, the end face exhaust surface 9, the gas collection groove 8, and the mold lip exhaust groove 62 are connected in sequence from the inside to the outside, allowing gas to flow outward.

[0029] Reference Figures 3 - 6 8 , and the lip 3 is installed at the other end of the mold cavity 2; the core seat 1 includes a mating end surface C, and the end of the lip 3 away from the mold cavity 2 contacts and cooperates with the mating end surface C, and the inlet of the lip exhaust groove 62 is connected to the gas gathering groove 8; the mating end surface C and the end surface exhaust surface 9 are staggered with each other, and a gap is left between the end surface exhaust surface 9 and the end of the lip 3 away from the mold cavity 2 for the gas in the preform mold cavity to enter the gas gathering groove 8, that is, the end surface exhaust surface 9 and the end of the lip 3 away from the mold cavity 2 are clearance-fitted; and the end surface exhaust surface 9 is an annular structure, and the gas in the preform mold cavity flows out to the gas gathering groove 8 through the annular end surface exhaust surface 9. The annular end surface exhaust surface 9 can increase the exhaust area of the preform mold cavity and improve the exhaust efficiency; the gas gathering groove 8 is arranged on the mating end surface C, and one end of the ventilation channel 11 extends through the mating end surface C and is connected with the gas gathering groove 8 to facilitate better gas transportation.

[0030] In this embodiment, the right end surface of the core seat 1 has a bottle mouth groove 12, the die lip 3 is provided with a preform mouth cavity 31 for forming the bottle preform mouth, the mold cavity 2 is provided with a preform body cavity 21 for forming the bottle preform body, and the mold cavity bottom 5 is provided with a preform bottom cavity 51 for forming the bottle preform bottom. The bottle mouth groove 12, the preform mouth cavity 31, the preform body cavity 21, and the preform bottom cavity 51 form a cavity. The mold core 4 is arranged in the core seat 1 and its right end is inserted into the cavity to form the bottle preform cavity. Figure 3As shown. The end face exhaust surface 9 is arranged at the parting surface of the bottle mouth groove 12 of the die core seat 1 and the die lip 3. One end of the axial exhaust channel 7 communicates with the bottle mouth groove 12. The end face exhaust surface 9 and the axial exhaust channel 7 simultaneously discharge to the outside from the bottle preform cavity, improving the exhaust efficiency. During operation, the raw material enters from the die cavity bottom 5, and the gas is squeezed by the raw material and sequentially passes through the blank bottom cavity 51, the blank body cavity 21, the blank mouth cavity 31, the bottle mouth groove 12, and then is discharged to the outside through the end face exhaust surface 9 and the axial exhaust channel 7.

[0031] In this embodiment, the gas collecting groove 8 covers the inlet of the die lip exhaust groove 62 to ensure the communication area between the gas collecting groove 8 and the die lip exhaust groove 62, enabling the gas to flow quickly. Moreover, the groove width of the gas collecting groove 8 is not less than 1 mm, and the depth is not less than 0.5 mm to ensure the effective flow area of the gas in the gas collecting groove 8 and guarantee the gas discharge efficiency.

[0032] In this embodiment, the gas collecting groove 8 is of an annular structure, and the ventilation channel 11 is of a hole-like structure. The diameter of the ventilation channel 11 is larger than the groove width of the gas collecting groove 8 to ensure the discharge efficiency of the ventilation channel 11. The axial plane D of the ventilation channel 11 is internally tangent to the small diameter of the annular gas collecting groove 8, and the axis of the ventilation channel 11 is parallel to the die core seat conical surface E, that is, the ventilation channel 11 is inclinedly arranged on the die core seat 1. Through the above structure, the exhaust direction can be changed, the probability of pressure loss can be reduced, and the strength deficiency of the die core seat conical surface E can be avoided to improve the service life.

[0033] In this embodiment, a step is provided on the die core seat conical surface E of the die core seat 1. The step is axially cut on the die core seat conical surface E. After the die core 4 is fitted with the die core seat 1, a gap is left, and this gap is used as the axial exhaust channel 7. The axially formed exhaust channel 7 is of an annular structure, which can increase the exhaust area for the gas to flow out of the bottle preform cavity and improve the exhaust efficiency of the bottle preform cavity. Moreover, the axial exhaust channel 7 is used for axial exhaust of the bottle preform cavity, and there is no need for the gas to flow around through other structures, so the exhaust efficiency is fast. To further improve the exhaust efficiency, an annular groove 13 is also provided in the die core seat 1. The annular groove 13 corresponds to the annular axial exhaust channel 7, and the air outlet hole 61 communicates with the axial exhaust channel 7 through the annular groove 13.

[0034] Embodiment 2

[0035] Refer to Figures 7 - 8 In this embodiment, the structure is basically the same as that of Embodiment 1, except that: the end face exhaust surface 9 is composed of several arc channels with an arc groove structure in cross section. The several arc channels extend and diverge from the normal direction of the axis from the inside to the outside and are arranged in an annular distribution. This structure also ensures the area for the gas to be discharged from the bottle preform cavity.

[0036] The above are only the preferred embodiments of the present invention, and all technical solutions that achieve the purpose of the present invention by substantially the same means fall within the protection scope of the present invention.

Claims

1. A total structure of cavity forming parts applied to a preform mold, including a preform cavity and a cavity exhaust structure formed by combining a core seat, a cavity, a die lip, a core, and a cavity bottom, characterized in that: The cavity exhaust structure includes an air outlet channel for exhausting to the outside, an axial exhaust channel formed by the cooperation of the mold core and the mold core seat, an air collecting groove and an end face exhaust surface provided at one end where the mold core seat cooperates with the mold lip. The air outlet channel includes an air outlet hole on the mold core seat and a mold lip exhaust groove on the mold lip. The two ends of the axial exhaust channel are respectively communicated with the air outlet hole and the preform cavity. A ventilation channel communicating the air collecting groove and the air outlet hole is provided on the mold core seat. The preform cavity, the end face exhaust surface, the air collecting groove, and the mold lip exhaust groove are communicated in sequence from inside to outside; the preform cavity, the end face exhaust surface, the air collecting groove, the ventilation channel, and the air outlet hole are communicated in sequence.

2. The assembly structure of the cavity forming part applied to the preform mold according to claim 1, characterized in that: The end face exhaust surface is arranged at the parting surface between the bottle mouth groove of the mold core seat and the mold lip.

3. The assembly structure of the cavity forming part applied to the preform mold according to claim 1 or 2, characterized in that: The end face exhaust surface is of an annular structure.

4. The assembly structure of cavity forming parts applied to a preform mold according to claim 1 or 2, characterized in that: The end face exhaust surface is composed of several arc channels with an arc groove cross-section structure. The several arc channels extend and diverge from the normal direction of the axis from inside to outside and are arranged in an annular distribution.

5. The assembly structure of the cavity forming part applied to the preform mold according to claim 1, characterized in that: The air collecting groove covers the entrance of the mold lip exhaust groove.

6. The assembly structure of the cavity forming part applied to the preform mold according to claim 1, wherein: The width of the air collecting groove is not less than 1 mm, and the depth is not less than 0.5 mm.

7. The assembly structure of a cavity forming part applied to a preform mold according to claim 1, characterized in that: The air collecting groove is of an annular structure.

8. The assembly structure of the cavity forming part applied to the preform mold according to claim 7, characterized in that: The axial plane D of the ventilation channel is internally tangent to the small diameter of the annular air collecting groove.

9. The assembly structure of the cavity forming part applied to the preform mold according to claim 1 or 8, characterized in that: The diameter of the ventilation channel is larger than the width of the air collecting groove.

10. The assembly structure of cavity forming parts applied to a preform mold according to claim 1 or 8, characterized in that: The axis of the ventilation channel is parallel to the conical surface E of the mold core seat.

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