A mold for blow molding a plastic bucket

Abstract

The utility model discloses a mould for plastic bucket blow molding, including mould no.

Description

Technical Field

[0001] This utility model relates to the field of plastic bucket blow molding technology, specifically a mold for plastic bucket blow molding. Background Technology

[0002] Plastic buckets are mostly made of polyethylene, polypropylene, and other plastics through blow molding and injection molding. They are used as outer packaging for liquids and solids in industries such as chemicals, pesticides, pharmaceuticals, food, hardware, electronics, and electromechanical products. Plastic buckets are typically blow-molded using blow molding molds during production. Existing technology includes a patent (CN 218701185U) that discloses a mold for blow molding plastic buckets, comprising a base, a fixed mold fixedly mounted on the top of the base, a movable mold slidably mounted on the top of the base, and the movable mold being compatible with the fixed mold. A drive box is fixedly mounted on the top of the base, and a pushing mechanism is provided on the drive box, which is connected to the movable mold. The fixed mold has a cavity, and a movable plate is slidably mounted inside the cavity. Multiple compression springs are fixedly mounted on one side of the movable plate, and one end of each compression spring is fixedly connected to the inner wall of one side of the cavity. An ejection mechanism is provided on the movable plate, comprising a receiving groove, a push plate, and a push rod. The receiving groove is located in the forming chamber of the fixed mold. On the inner wall, this utility model has the following advantages and effects: When the moving mold and the fixed mold are separated, the push plate can push the molded plastic bucket out of the molding chamber of the fixed mold, making it easy to take out the molded plastic. However, after the plastic bucket is blow-molded, it is still in a relatively soft state due to temperature factors. In order to avoid the plastic bucket from being not hard enough and causing some of it to stick to the blow molding cavity during the removal process, the plastic bucket blow molding mold needs to be left to stand for a period of time until the plastic bucket inside cools down and solidifies to a certain extent before the mold can be separated and the blow-molded plastic bucket can be taken out from the blow molding cavity. This process is relatively time-consuming. Therefore, we propose a mold for blow molding plastic buckets. Utility Model Content

[0003] The technical problem this invention aims to solve is to overcome existing defects and provide a mold for blow molding plastic buckets. This device uses cooling elements to cool and solidify the blow-molded plastic buckets, thereby increasing the unloading speed of the blow-molded plastic buckets. At the same time, the cooling pipes are evenly distributed around the blow molding cavity through a ring design, making the cooling and solidification of the blow-molded plastic buckets more uniform, thus improving the curing speed of the blow-molded plastic buckets. Furthermore, the cooling pipes of the plastic buckets in the device can be automatically connected and disconnected as the two blow molding dies close and open, making it convenient to use and effectively solving the problems in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a mold for blow molding of plastic buckets, including a mold one, a mold two installed behind the mold one, blow molding cavities being provided on the opposite inner surfaces of the mold one and the mold two, and a cooling mechanism.

[0005] Cooling mechanism: It includes cooling pipe one, cooling pipe two, and a separating component. Cooling pipe one is located inside mold one, and cooling pipe two is located inside mold two. A separating component is provided between cooling pipe one and cooling pipe two. This device can cool and solidify the blow-molded plastic bucket through cooling elements, thereby improving the unloading speed of the blow-molded plastic bucket. At the same time, the cooling pipes are evenly distributed around the blow molding cavity through a ring design, so that the cooling and solidification of the blow-molded plastic bucket is more uniform, thereby improving the curing speed of the blow-molded plastic bucket. Furthermore, the cooling pipes of the plastic bucket in the device can be automatically connected and disconnected as the two blow molding molds close and open, making it convenient to use.

[0006] Furthermore, the front side of the second mold is provided with four evenly distributed guide pins, and the rear side of the first mold is provided with four evenly distributed insertion holes. The guide pins are all inserted into the longitudinally adjacent insertion holes to guide the longitudinal alignment of the blow molding cavity between the first mold and the second mold in the plastic bucket blow molding mold.

[0007] Furthermore, both mold one and mold two are provided with rubber sealing rings on their respective inner surfaces to seal the closed gap between mold one and mold two inside the plastic bucket blow molding mold.

[0008] Furthermore, the cooling mechanism also includes a connecting flange and a control valve. The connecting flange is respectively located at the lower right end of the cooling pipe 1 and the cooling pipe 2. The lower right end of both the cooling pipe 1 and the cooling pipe 2 is connected in series with a control valve, which facilitates connecting the cooling pipe inside the mold for blowing plastic buckets with the external coolant supply hose and coolant drain hose.

[0009] Furthermore, the cooling mechanism also includes an inner tube and a second rubber sealing ring. The inner tube is located inside the upper left end of the cooling tube two, and the second rubber sealing ring is provided on the front side of the inner tube to seal the joint gap between the first cooling tube and the inner tube in the plastic bucket blow molding mold.

[0010] Furthermore, the separating assembly includes a cross-shaped component, a sliding rod, a second cross-shaped component, a telescopic column, a spring, a sealing seat, and a conical ring. The first cross-shaped component is located inside the upper left end of the cooling pipe. A sliding rod is slidably connected to a circular hole in the middle of the first cross-shaped component. Both the second and upper left ends of the cooling pipes are equipped with a second cross-shaped component and a conical ring. Two conical rings are located between two second cross-shaped components. Sealing seats are provided on the opposite inner surfaces of the two second cross-shaped components via telescopic columns and springs. The springs are movably connected to the outer ends of adjacent telescopic columns. The sealing seats are respectively installed in conjunction with the sliding rod and the longitudinally adjacent conical rings. The cooling pipes inside the plastic bucket blow molding mold can automatically connect and disconnect as the two blow molding molds close and separate.

[0011] Furthermore, the separating component also includes a rubber sealing ring three, which is disposed inside the conical ring to seal the gap between the conical ring and the sealing seat inside the mold for blow molding plastic buckets.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This mold for blow molding plastic buckets has the following advantages:

[0013] When using a blow molding mold for plastic buckets, cooling pipes one and two can cool and solidify the blow-molded plastic buckets, thereby increasing the unloading speed of the blow-molded plastic buckets. At the same time, cooling pipes one and two are evenly distributed around the blow molding cavity through a ring design, making the cooling and solidification of the blow-molded plastic buckets more uniform, thus increasing the curing speed of the blow-molded plastic buckets. Furthermore, cooling pipes one and two in the device can automatically connect and disconnect as the two blow molding molds close and open through a separator component, making it convenient to use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the cooling mechanism of this utility model;

[0017] Figure 4 This is a cross-sectional view of the connection between cooling pipe one and cooling pipe two of this utility model.

[0018] In the diagram: 1 Mold 1, 2 Mold 2, 3 Blow molding cavity, 4 Guide pin, 5 Rubber sealing ring 1, 6 Cooling mechanism, 61 Cooling pipe 1, 62 Cooling pipe 2, 63 Connecting flange 1, 64 Control valve, 65 Inner pipe, 66 Rubber sealing ring 2, 67 Separator assembly, 671 Cross 1, 672 Slide rod, 673 Cross 2, 674 Telescopic column, 675 Spring, 676 Sealing seat, 677 Cone ring, 678 Rubber sealing ring 3. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-4This embodiment provides a technical solution: a mold for blow molding a plastic bucket, including a mold 1, a mold 2 installed at the rear of the mold 1, blow molding cavities 3 on the opposite inner surfaces of the mold 1 and the mold 2, four evenly distributed guide pins 4 on the front of the mold 2, and four evenly distributed insertion holes on the rear of the mold 1. The guide pins 4 are all inserted into the longitudinally adjacent insertion holes. Rubber sealing rings 5 ​​are provided on the opposite inner surfaces of the mold 1 and the mold 2. When using the device to blow mold the plastic bucket, the mold 1 and the mold 2 are first connected to the telescopic ends of the corresponding external hydraulic rods through the flanges in their respective middle sections to blow mold the plastic bucket. The blow molding unit carries the plastic bucket preform and moves it between the two blow molding cavities 3, and then the external hydraulic rods... The process involves bringing mold 1 and mold 2 closer together. During this process, the front end of the guide pin 4 first engages with the longitudinally adjacent insertion hole. The engagement between the two ensures that the blow molding cavities 3 between mold 1 and mold 2 are longitudinally aligned. After mold 1 and mold 2 are closed, the rubber sealing ring 5 seals the contact gap between mold 1 and mold 2, preventing the plastic barrel preform in the blow molding cavity 3 from overflowing from the gap during the blow molding process. Subsequently, high-pressure gas is delivered to the plastic barrel preform through an external blow molding unit, causing the plastic barrel preform to be stretched and adhered to the wall of the blow molding cavity 3 by the internal high-pressure gas blow molding, thus achieving the blow molding of the plastic barrel. The process also includes a cooling mechanism 6.

[0021] Cooling mechanism 6 includes a first cooling pipe 61, a second cooling pipe 62, and a partition assembly 67. The first cooling pipe 61 is located inside the first mold 1, and the second cooling pipe 62 is located inside the second mold 2. A partition assembly 67 is provided between the first cooling pipe 61 and the second cooling pipe 62. Cooling mechanism 6 also includes a first connecting flange 63 and a control valve 64. The first connecting flange 63 is located at the lower right end of the first cooling pipe 61 and the second cooling pipe 62, respectively. A control valve 64 is connected in series at the lower right end of both the first cooling pipe 61 and the second cooling pipe 62. Cooling mechanism 6 also includes an inner pipe 65 and a second rubber sealing ring 66. The inner pipe 65 is located inside the upper left end of the second cooling pipe 62, and a second rubber sealing ring 66 is provided on the front side of the inner pipe 65. The partition assembly 67 includes a cross-shaped component 671 and a sliding component 68. The system comprises a rod 672, a cross 673, a telescopic column 674, a spring 675, a sealing seat 676, and a cone ring 677. The cross 671 is located inside the upper left end of the cooling pipe 62. A sliding rod 672 is slidably connected to a circular hole in the middle of the cross 671. Both the upper left end of the cooling pipe 62 and the cooling pipe 61 have crosses 673 and cone rings 677, with two cone rings 677 positioned between the two crosses 673. Sealing seats 676 are located on the opposite inner surfaces of the two crosses 673 via telescopic columns 674 and springs 675. Springs 675 are movably sleeved with the outer ends of adjacent telescopic columns 674. Sealing seats 676 are respectively fitted with the sliding rod 672 and the longitudinally adjacent cone rings 677. The partition assembly 67 also includes... Including rubber sealing ring 3 678, which is respectively set inside the conical ring 677, the lower right ends of cooling pipe 1 61 and cooling pipe 2 62 are connected to the external coolant supply hose and coolant drain hose through connecting flange 1 63. Then, the control valve 64 is opened, and coolant enters through the lower right end of cooling pipe 1 61 through the external coolant supply hose. Then, the coolant passes through cooling pipe 2 62 and is discharged through the lower right end of cooling pipe 2 62 to the external coolant drain hose. During the flow of coolant along cooling pipe 1 61 and cooling pipe 2 62, heat transfer is used to cool and lower the temperature of the blow-molded plastic bucket, accelerating its molding speed. Through the structural design of cooling pipe 1 61 and cooling pipe 2 62, the cooling pipe is effectively cooled. This arrangement causes the cooling pipes 61 and 62 to form a ring around the outer end of the blow-molded plastic bucket, resulting in more uniform cooling after the plastic bucket is blow-molded, thus improving the cooling effect. When cooling pipes 61 and 62 are in use, as molds 1 and 2 close together, the upper left openings of cooling pipes 61 and 62 gradually approach each other. The inner pipe 65 first slides into the upper left opening of cooling pipe 61 and slides along the inner wall of cooling pipe 61. Then, the front end of the sliding rod 672 penetrates into the upper left opening of cooling pipe 61 and presses against the front sealing seat 676. At this time, the rear end of the sliding rod 672 presses against the rear sealing seat 676.As mold 1 and mold 2 continue to approach each other, when the compressive force exerted by the front and rear ends of the sealing seat 676 on the corresponding sealing seat 676 exceeds the sum of the compressive force exerted by the spring 675 on the sealing seat 676 and the coolant pressure, the sealing seats 676 move away from the adjacent conical ring 677. The telescopic end of the telescopic column 674 and the spring 675 retract, thereby releasing the sealing and limiting effect of the sealing seat 676 on the conical ring 677, allowing the upper left end of the cooling pipe 1 61 and the cooling pipe 2 62 to connect. (During this process, the sliding gap between the inner tube 65 and the inner wall of the cooling pipe 61 is sealed by the rubber sealing ring 66 to prevent coolant from overflowing from this part.) When mold 1 and mold 2 move away from each other to a certain extent, the slide rod 672 no longer applies pressure to the corresponding sealing seat 676. At this time, the compression and reset force of the spring 675 causes the sealing seat 676 to squeeze and seal the corresponding cone ring 677 again, so that when mold 1 and mold 2 separate, the left side of the gap between cooling pipe 61 and cooling pipe 62... As the upper pipe ends move away from each other, they automatically close (during this process, rubber sealing ring 678 seals the sealing gap between cone ring 677 and adjacent sealing seat 676, preventing coolant from overflowing from this part), preventing coolant in cooling pipe 1 61 and cooling pipe 2 62 from flowing out through this part of the pipe opening. Rubber sealing ring 3 678, rubber sealing ring 2 66, and rubber sealing ring 1 5 all utilize principles such as pressure, friction, surface contact, and lubrication to form a sealing gap between the two contact surfaces, thereby preventing leakage of liquid medium from the corresponding gap. This device can cool and cure the blow-molded plastic bucket through cooling elements, thereby increasing the unloading speed of the blow-molded plastic bucket. At the same time, the cooling pipes are evenly distributed around the blow molding cavity through a ring design, making the cooling and curing of the blow-molded plastic bucket more uniform, thus improving the curing speed of the blow-molded plastic bucket. Furthermore, the cooling pipes of the plastic bucket in the device can be automatically connected and disconnected as the two blow molding dies close and separate, making it convenient to use.

[0022] The working principle of the blow molding mold for plastic buckets provided by this utility model is as follows: When the device blow molds the plastic bucket, firstly, mold 1 and mold 2 are connected to the telescopic ends of the corresponding external hydraulic rods through their respective central flanges. Then, the lower right ends of cooling pipe 1 61 and cooling pipe 2 62 are connected to the external coolant supply hose and coolant drain hose through connecting flange 1 63. Then, the control valve 64 is opened to blow mold the plastic bucket. The blow molding unit carries the plastic bucket preform and moves it between the two blow molding cavities 3. Then, the external hydraulic rods make mold 1 and mold 2 move closer to each other. During the process of mold 1 and mold 2 moving closer to each other, the front end of the guide pin 4 first inserts into the longitudinally adjacent insertion hole, and through the two... The insertion guide between molds 1 and 2 ensures longitudinal alignment of the blow molding cavity 3 between them as they approach each other. After molds 1 and 2 close, a rubber sealing ring 5 seals the contact gap between them, preventing the plastic barrel preform inside the blow molding cavity 3 from overflowing during the blow molding process. Then, high-pressure gas is supplied to the plastic barrel preform through an external blow molding unit, stretching it and causing it to conform to the wall of the blow molding cavity 3, thus achieving blow molding of the plastic barrel. Finally, coolant is supplied through an external coolant supply hose, entering through the lower right end of cooling pipe 61. The coolant then passes through cooling pipe 62 and... The coolant drain hose, located at the lower right end, discharges coolant to the outside. As the coolant flows along cooling pipes 61 and 62, it cools the blow-molded plastic bucket through heat transfer, accelerating the molding process. The structural design of cooling pipes 61 and 62 creates a ring-shaped structure that wraps around the outer end of the blow-molded plastic bucket, resulting in more uniform cooling after molding and improving the overall cooling effect. When cooling pipes 61 and 62 are in use, as molds 1 and 2 close together, the inner pipe 65 slides first as the upper left ends of cooling pipes 61 and 62 gradually approach each other. The slide rod 672 is inserted into the upper left end of the cooling pipe 61 and slides along the inner wall of the cooling pipe 61. Then, the front end of the slide rod 672 penetrates into the upper left end of the cooling pipe 61 and presses against the front sealing seat 676. At this time, the rear end of the slide rod 672 presses against the rear sealing seat 676. As the mold 1 and mold 2 continue to move closer, when the pressing force applied by the front and rear ends of the sealing seat 676 to the corresponding sealing seat 676 is greater than the sum of the compressive force applied by the spring 675 to the sealing seat 676 and the coolant liquid pressure, the sealing seats 676 move away from the adjacent cone ring 677. The telescopic end of the telescopic column 674 and the spring 675 retract, thereby releasing the sealing limit of the sealing seat 676 on the cone ring 677.This connects the upper left ends of cooling pipe 61 and cooling pipe 62 (during this process, the sliding gap between the inner pipe 65 and the inner wall of the cooling pipe 61 is sealed by the rubber sealing ring 66 to prevent coolant from overflowing from this part). When mold 1 and mold 2 move away from each other to a certain extent, the slide rod 672 no longer applies pressure to the corresponding sealing seat 676. At this time, the compression and reset force of the spring 675 causes the sealing seat 676 to squeeze and seal the corresponding cone ring 677 again, so that when mold 1 and mold 2 separate, the cooling pipe 61 and cooling pipe 62 are connected. The upper left end of each pipe automatically closes as they move away from each other (during this process, rubber sealing ring 678 seals the gap between cone ring 677 and adjacent sealing seat 676, preventing coolant from overflowing from this location), thus preventing coolant in cooling pipes 61 and 62 from flowing out through this opening. Rubber sealing rings 678, 66, and 5 all utilize pressure, friction, surface contact, and lubrication to form a sealing gap between the two contact surfaces, thereby preventing leakage of liquid media from the corresponding gaps.

[0023] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A blow molding mold for a plastic bucket, comprising a first mold (1), a second mold (2) installed behind the first mold (1), and blow molding cavities (3) formed on the opposite inner surfaces of the first mold (1) and the second mold (2), characterized in that: It also includes a cooling mechanism (6); Cooling mechanism (6): It includes a first cooling pipe (61), a second cooling pipe (62) and a partition component (67). The first cooling pipe (61) is located inside the first mold (1), the second mold (2) is provided with the second cooling pipe (62), and a partition component (67) is provided between the first cooling pipe (61) and the second cooling pipe (62).

2. The mold for blow molding a plastic bucket according to claim 1, characterized in that: The front side of the mold 2 (2) is provided with four evenly distributed guide pins (4), and the rear side of the mold 1 (1) is provided with four evenly distributed insertion holes. The guide pins (4) are all inserted into the longitudinally adjacent insertion holes.

3. The mold for blow molding a plastic bucket according to claim 1, characterized in that: Both mold one (1) and mold two (2) are provided with rubber sealing ring one (5) on their opposite inner surfaces.

4. The mold for blow molding a plastic bucket according to claim 1, characterized in that: The cooling mechanism (6) also includes a connecting flange (63) and a control valve (64). The connecting flange (63) is respectively located at the lower right end of the cooling pipe (61) and the cooling pipe (62). The lower right end of the cooling pipe (61) and the cooling pipe (62) are connected in series with the control valve (64).

5. The mold for blow molding a plastic bucket according to claim 1, characterized in that: The cooling mechanism (6) also includes an inner tube (65) and a second rubber sealing ring (66). The inner tube (65) is located inside the upper left end of the cooling pipe (62), and the second rubber sealing ring (66) is provided on the front side of the inner tube (65).

6. The mold for blow molding a plastic bucket according to claim 1, characterized in that: The separating assembly (67) includes a cross-shaped component (671), a sliding rod (672), a second cross-shaped component (673), a telescopic column (674), a spring (675), a sealing seat (676), and a conical ring (677). The first cross-shaped component (671) is disposed inside the upper left end of the cooling pipe (62). The sliding rod (672) is slidably connected to a circular hole in the middle of the first cross-shaped component (671). The upper left end of the cooling pipe (62) and the cooling pipe (61) are connected to each other. Each mouth is provided with a cross-shaped second (673) and a cone ring (677). The two cone rings (677) are located between the two cross-shaped second (673). The opposing inner surfaces of the two cross-shaped second (673) are provided with sealing seats (676) through telescopic columns (674) and springs (675). The springs (675) are movably connected to the outer ends of the adjacent telescopic columns (674). The sealing seats (676) are respectively installed in conjunction with the sliding rod (672) and the longitudinally adjacent cone rings (677).

7. The mold for blow molding a plastic bucket according to claim 6, characterized in that: The separating component (67) also includes a rubber sealing ring three (678), which is disposed inside the conical ring (677).

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