Mould sprue for bottle blank production

Abstract

The utility model discloses a mould sprue for bottle blank production, which relates to the technical field of plastic molding, and comprises a mould base body, a sprue bush, a fixing ring and a pair of semi-ring bodies, the mould base body is provided with a first mounting hole, and the mould base body is provided with a second mounting hole corresponding to the upper part of the first mounting hole in an external expansion manner; the second mounting hole and the first mounting hole form a stepped table and are located on the same axis, the fixing ring is fixedly arranged on the sprue bush and integrally formed with the sprue bush, the outer diameter of the sprue bush is smaller than or equal to the inner diameter of the first mounting hole, and the outer diameter of the fixing ring is smaller than or equal to the inner diameter of the second mounting hole; the sprue bush with the fixing ring and the mold base body with the second mounting hole are preset, the fixing ring is clamped in the second mounting hole, the fixing ring is axially pressed through the pair of semi-ring bodies, the sprue bush is fixed while the stability of the sprue bush is guaranteed, the semi-ring bodies are fixed through the screws, mounting and dismounting are convenient, and parts are prevented from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of plastic molding technology, specifically to a mold gate for bottle preform production. Background Technology

[0002] In the field of preform injection molding, the gate, as the core channel for molten plastic to enter the mold cavity, directly affects molding quality and production efficiency due to its installation reliability. Traditional gate installation generally employs an interference fit press-fit structure, where the gate sleeve is frozen with liquid nitrogen and then pressed into the mold mounting hole, utilizing the shrinkage properties of metal to achieve a tight fixation. While this method can meet conventional production needs, it has significant drawbacks in practical applications:

[0003] 1. If the gate is worn or blocked, the mold needs to be completely disassembled. The gate bushing is removed by heating or forceful hammering, which can easily damage the mold cavity. Moreover, the repair cycle can take several hours, resulting in high maintenance costs.

[0004] 2. The injection temperature is relatively high during operation (e.g., the injection temperature of PET material reaches 280-300℃), while it is at room temperature when not in operation. The switching between the working and non-working states of the sprue bushing and the mold base will cause thermal expansion and contraction. Moreover, the thermal expansion coefficients of the two are different, which may cause the sprue bushing and the mold base to loosen, making the installation unstable and affecting the casting operation. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this utility model provides a mold gate for bottle preform production. It includes a pre-set gate sleeve with a fixing ring and a mold base with a second mounting hole. The fixing ring is engaged in the second mounting hole and is axially pressed by a pair of half-rings, ensuring the stability of the gate sleeve while also fixing it. The half-rings are fixed with screws, making installation and disassembly convenient and avoiding damage to components.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a mold gate for bottle preform production, comprising a mold base, a gate sleeve, a fixing ring, and a pair of half-rings. The mold base has a first mounting hole, and a second mounting hole is provided at the upper part of the mold base corresponding to the first mounting hole. The second mounting hole and the first mounting hole form a stepped platform and are on the same axis. The fixing ring is fixedly mounted on the gate sleeve and integrally formed with the gate sleeve. The outer diameter of the gate sleeve is less than or equal to the inner diameter of the first mounting hole, and the outer diameter of the fixing ring is less than or equal to the inner diameter of the second mounting hole. The lower end of the gate sleeve is inserted into the first mounting hole. Simultaneously, the fixing ring is inserted into the second mounting hole, and a first rubber sealing sleeve is provided between the fixing ring and the stepped platform. A pair of half-rings can form a complete ring. The inner diameter of the half-ring is equal to the outer diameter of the sprue sleeve, and the outer diameter of the half-ring is less than or equal to the inner diameter of the second mounting hole. The half-ring is inserted into the second mounting hole and its lower end pushes against the upper surface of the fixing ring. A rubber anti-slip sleeve is provided on the inner side wall of the pair of half-rings, and the rubber anti-slip sleeve surrounds the outer side wall of the sprue sleeve. The upper end of the half-ring is provided with an mounting ring that expands outward. The mold base has multiple threaded holes corresponding to the bottom of the mounting ring. The mounting ring is fixed by screwing multiple screws into the threaded holes.

[0007] Preferably, multiple limiting grooves are vertically formed on the side wall of the second mounting hole, and multiple sliders are evenly arranged on the side wall of the fixing ring, with the sliders slidingly connected to the limiting grooves vertically.

[0008] Preferably, a second rubber sealing sleeve is provided between the lower end of the semi-ring and the fixed ring.

[0009] Preferably, the upper part of the second mounting hole is flared.

[0010] Preferably, the mold base has an installation groove corresponding to the position of the installation ring, the installation ring is inserted into the installation groove, and a plurality of threaded holes are evenly provided at the bottom of the installation groove, and the screw passes through the installation ring and is screwed into the threaded holes.

[0011] Preferably, the semi-ring body and the mounting ring are integrally formed.

[0012] This utility model provides a mold gate for preform production, which has the following beneficial effects:

[0013] 1. This utility model is designed with a sprue sleeve with a fixing ring and a mold base with a second mounting hole. The fixing ring is inserted into the second mounting hole and is axially pressed by a pair of half-rings to ensure the stability of the sprue sleeve and fix it. The half-rings are fixed by screws, which makes installation and disassembly convenient and avoids damage to the parts.

[0014] 2. In this utility model, a second rubber sealing sleeve is provided between the lower end of the semi-ring and the fixed ring to further increase the sealing performance and increase the friction between the two; a limiting groove is vertically opened on the side wall of the second mounting hole, and a slider is provided on the side wall of the fixed ring. The slider is vertically slidably connected to the limiting groove to prevent the sprue sleeve from rotating and to increase its stability. Attached Figure Description

[0015] Figure 1 This is a front sectional view of a mold gate for bottle preform production according to this utility model;

[0016] Figure 2 This is a front sectional disassembly view of a mold gate for bottle preform production according to this utility model;

[0017] Figure 3 A schematic diagram showing the setting groove for the mold base of this utility model;

[0018] Figure 4 A schematic diagram showing the slider provided for the gating sleeve of this utility model.

[0019] In the figure: 1. Mold base; 2. First mounting hole; 3. Second mounting hole; 4. Mounting groove; 5. Flange; 6. Sprue sleeve; 7. Retaining ring; 8. Semi-ring; 9. Mounting ring; 10. Screw; 11. Threaded hole; 12. Rubber anti-slip sleeve; 13. Second rubber sealing sleeve; 14. First rubber sealing sleeve; 15. Limiting groove; 16. Slider. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1-4As shown, a mold gate for bottle preform production includes a mold base 1, a gate sleeve 6, a retaining ring 7, and a pair of half-rings 8. The mold base 1 has a first mounting hole 2. A second mounting hole 3 is formed by expanding outwards at the upper part of the mold base 1 corresponding to the first mounting hole 2. The second mounting hole 3 and the first mounting hole 2 form a stepped platform and are on the same axis. The retaining ring 7 is fixedly mounted on the gate sleeve 6 and integrally formed with it. The outer diameter of the gate sleeve 6 is less than or equal to the inner diameter of the first mounting hole 2, and the outer diameter of the retaining ring 7 is less than or equal to the inner diameter of the second mounting hole 3. The lower end of the gate sleeve 6 is inserted into the first mounting hole 2, while the retaining ring 7 is inserted into the second mounting hole 3. A first rubber sealing sleeve 14 is provided between the retaining ring 7 and the stepped platform. The pair of half-rings 8 can form a complete ring. The inner diameter of the half-ring 8 is equal to the outer diameter of the gate sleeve 6, and the outer diameter of the half-ring 8 is less than or equal to the inner diameter of the second mounting hole 3. The half-ring 8 is inserted into the second mounting hole 3 and its lower end... On the upper surface of the end extrusion fixing ring 7, a pair of semi-ring bodies 8 have rubber anti-slip sleeves 12 on their inner sidewalls, and the rubber anti-slip sleeves 12 encircle the outer sidewall of the gate sleeve 6. The upper end of the semi-ring body 8 is provided with an installation ring 9 that expands outward. The mold base 1 has multiple threaded holes 11 at the bottom of the installation ring 9. The installation ring 9 is fixed by multiple screws 10 screwed into the threaded holes 11. The sidewall of the second installation hole 3 has multiple vertically opened limiting grooves 15. The sidewall of the fixing ring 7 is provided with multiple sliders 16, which are vertically slidably connected to the limiting grooves 15. A second rubber sealing sleeve 13 is provided between the lower end of the semi-ring body 8 and the fixing ring 7. The upper part of the second installation hole 3 is designed with an flared opening 5. The mold base 1 has an installation groove 4 at the position of the installation ring 9. The installation ring 9 is inserted into the installation groove 4. The bottom of the installation groove 4 has multiple threaded holes 11 that are evenly opened. The screws 10 pass through the installation ring 9 and are screwed into the threaded holes 11. The semi-ring body 8 and the installation ring 9 are integrally formed.

[0022] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, as follows:

[0023] According to the instruction manual Figure 1-4As can be seen, in this utility model, the fixing ring 7 is fixedly set on the sprue sleeve 6, preferably near the center position. The sprue sleeve 6 is existing technology. The fixing ring 7 is preferably integrally formed with the sprue sleeve 6 to increase its strength. This design is a pre-customized design. The mold base 1 has a first mounting hole 2 and a second mounting hole 3 on the same axis. The second mounting hole 3 is above the first mounting hole 2 and is designed to expand outward, that is, the inner diameter is larger than the first mounting hole 2. This design is also a pre-customized design. During installation, since the outer diameter of the sprue sleeve 6 is less than or equal to the inner diameter of the first mounting hole 2, and the outer diameter of the fixing ring 7 is less than or equal to the inner diameter of the second mounting hole 3, the sprue sleeve 6 and the fixing ring 7 can be inserted into the first mounting hole 2 and the second mounting hole 3 respectively. The fixing ring 7 can be locked by the stepped platform formed by the first mounting hole 2 and the second mounting hole 3 and will not sink. Of course, in order to ensure the sealing effect, a first rubber sealing sleeve 14 is set between the fixing ring 7 and the stepped platform. A pair of semi-rings 8 can form a complete ring. A semi-ring 8 refers to half of a piece cut vertically along its axis. Since the inner diameter of the semi-ring 8 is equal to the outer diameter of the sprue sleeve 6, and the outer diameter of the semi-ring 8 is less than or equal to the inner diameter of the second mounting hole 3, the pair of semi-rings 8 can encircle the side surface of the sprue sleeve 6. Before the sprue sleeve 6 is inserted into the second mounting hole 3, the pair of semi-rings 8 are encircled on the side surface of the sprue sleeve 6 and positioned above the fixing ring 7. Then, the semi-rings 8 are inserted together into the second mounting hole 3. Simultaneously, the lower end of the semi-ring 8 can push against the upper surface of the fixing ring 7. The semi-ring 8 is fixed by screws 10 passing through the mounting ring 9 located outward from the upper end and screwing it into the threaded hole 11 of the mold base 1, ensuring the axial and circumferential stability of the semi-ring 8, thereby ensuring the axial stability of the fixing ring 7 and the sprue sleeve 6. The semi-ring 8 and the mounting ring 9 are integrally molded, further increasing strength and stability. Since the inner sidewalls of the pair of semi-rings 8 are provided with rubber anti-slip sleeves 12, the rubber anti-slip sleeves 12 surround the outer sidewall of the sprue sleeve 6, exerting a certain compressive force on it, increasing the friction between it and the sprue sleeve 6, and keeping it stable in the circumferential direction. This utility model uses screws 10 for fixing and the semi-ring 8 to press and fix the sprue sleeve 6 with the fixing ring 7, ensuring the stability of the sprue sleeve 6 while achieving convenient installation and disassembly and avoiding damage to parts.

[0024] The second mounting hole 3 has multiple vertically opened limiting grooves 15 on its side wall, and multiple sliders 16 are evenly arranged on the side wall of the fixing ring 7. The sliders 16 are vertically slidably connected to the limiting grooves 15 to prevent the gate sleeve 6 from rotating and to increase its stability.

[0025] A second rubber sealing sleeve 13 is provided between the lower end of the semi-ring 8 and the fixed ring 7 to further increase the sealing performance and increase the friction between the two.

[0026] The second mounting hole 3 has an flared opening 5 at the top to facilitate the insertion of the sprue sleeve 6 and the retaining ring 7.

[0027] The mold base 1 has an installation groove 4 at the position corresponding to the installation ring 9. The installation ring 9 is inserted into the installation groove 4. Multiple threaded holes 11 are evenly provided at the bottom of the installation groove 4. The screw 10 passes through the installation ring 9 and is screwed into the threaded hole 11 to install the installation plate in a hidden manner, ensuring the cleanliness of the surface of the mold base 1.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold gate for preform production, characterized in that, The mold includes a mold base (1), a sprue sleeve (6), a retaining ring (7), and a pair of half-rings (8). The mold base (1) has a first mounting hole (2). The mold base (1) has a second mounting hole (3) that expands outward at the upper part corresponding to the first mounting hole (2). The second mounting hole (3) and the first mounting hole (2) form a stepped platform and are on the same axis. The retaining ring (7) is fixedly mounted on the sprue sleeve (6) and is integrally formed with the sprue sleeve (6). The outer diameter of the sprue sleeve (6) is less than or equal to the inner diameter of the first mounting hole (2), and the outer diameter of the retaining ring (7) is less than or equal to the inner diameter of the second mounting hole (3). When the lower end of the sprue sleeve (6) is inserted into the first mounting hole (2), the retaining ring (7) is inserted into the second mounting hole (3), and the retaining ring (7) and the first mounting hole (2) are aligned. A first rubber sealing sleeve (14) is provided between the stepped platforms. A pair of semi-rings (8) can form a complete ring. The inner diameter of the semi-ring (8) is equal to the outer diameter of the sprue sleeve (6). The outer diameter of the semi-ring (8) is less than or equal to the inner diameter of the second mounting hole (3). The semi-ring (8) is inserted into the second mounting hole (3) and the lower end is squeezed against the upper surface of the fixed ring (7). A rubber anti-slip sleeve (12) is provided on the inner side wall of the pair of semi-rings (8), and the rubber anti-slip sleeve (12) surrounds the outer side wall of the sprue sleeve (6). The upper end of the semi-ring (8) is provided with a mounting ring (9). The mold base (1) is provided with multiple threaded holes (11) at the bottom of the mounting ring (9). The mounting ring (9) is fixed by screwing multiple screws (10) into the threaded holes (11).

2. The mold gate for preform production according to claim 1, characterized in that, The second mounting hole (3) has multiple vertically opened limiting grooves (15) on its side wall, and multiple sliders (16) are evenly arranged on the side wall of the fixing ring (7). The sliders (16) are vertically slidably connected to the limiting grooves (15).

3. The mold gate for preform production according to claim 1, characterized in that, A second rubber sealing sleeve (13) is provided between the lower end of the semi-ring (8) and the fixed ring (7).

4. The mold gate for preform production according to claim 1, characterized in that, The upper part of the second mounting hole (3) is designed with an flared opening (5).

5. A mold gate for preform production according to claim 1, characterized in that, The mold base (1) has an installation groove (4) at the position corresponding to the installation ring (9). The installation ring (9) is inserted into the installation groove (4). Multiple threaded holes (11) are evenly provided at the bottom of the installation groove (4). The screw (10) passes through the installation ring (9) and is screwed into the threaded hole (11).

6. A mold gate for preform production according to claim 1, characterized in that, The semi-ring (8) and the mounting ring (9) are integrally formed.

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