Blow molding device for injection-blow plastic bottles with bottle mouth edge
By designing up and down push plates and push slopes in the blow molding device, combined with limit blocks and elastic reset devices, the problem of bottle mouth deformation during blow molding plastic bottle preforms is solved, and the flattening of bottle mouth edges and the improvement of production efficiency is achieved.
Patent Information
- Application Number
- CN202420860504.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-04-24
AI Technical Summary
When the blow-molded plastic bottle preform is formed, the bottle mouth edges are uneven due to high temperature deformation, resulting in the bottle mouth edges of the plastic bottle being uneven and cannot meet the design requirements.
A blow molding device with upper and lower push plates and push slopes is designed. Through the limit block and elastic reset device, the blow molding upper and lower molds are pushed forward simultaneously during the mold closing process and flattened the edge of the bottle mouth.
The edge of the bottle is effectively flattened to ensure that the flatness of the plastic bottle meets the design requirements, while simplifying the installation and use of the device and improving production efficiency.
Smart Images
Figure CN222727366U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a blow molding device for injection-blowing plastic bottles, in particular to a blow molding device for injection-blowing plastic bottles with a bottle mouth edge. Background Art
[0002] It is well known that injection blow molding machines require higher preform temperatures when blowing preforms. Figure 1 When the three-station injection-blowing device shown in the figure is used to inject and blow a non-threaded bottle with a bottle mouth edge, the bottle mouth edge 911 is deformed under the action of high temperature due to the high temperature of the bottle blank 90, so that the final product is a defective plastic bottle 91 with a deformed bottle mouth edge 911, and the flatness of the bottle mouth edge 911 does not meet the design requirements (see Figure 5 shown). Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a blow molding device for injection-blowing plastic bottles with a bottle mouth edge which can flatten the bottle mouth edge during blow molding.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a blow molding device for injection-blowing plastic bottles with a bottle mouth edge, comprising: a blow molding lower mold base and a blow molding upper mold base that moves up and down relative to the blow molding lower mold base, and a blow molding upper half mold and a blow molding lower half mold corresponding to the injection-blowing plastic bottle, the blow molding upper mold base is provided with an upper half mold placement cavity corresponding to the blow molding upper half mold, the blow molding upper half mold is movably arranged in the upper half mold placement cavity, an end wall at a corresponding end of the upper half mold placement cavity, that is, its bottom wall, is provided with an upper half mold elastic reset device for pressing the blow molding upper half mold against the upper push plate, a lower mold placement cavity corresponding to the blow molding lower half mold is provided in the blow molding lower mold base, an end wall at a corresponding end of the lower mold placement cavity, that is, its bottom wall, is provided with a lower push plate, and an end wall at the other end of the lower mold placement cavity, that is, its top wall, is provided with a lower half mold elastic reset device for pressing the blow molding upper half mold against the upper push plate The blow molding upper mold is provided with a limiter which is connected to the blow molding upper mold and is separated from the side wall of the upper mold placement cavity by a certain distance in the opening and closing direction of the blow molding upper and lower molds in the mold opening state. Position block, in the process of closing the upper and lower half molds of blow molding, the upper and lower half molds of blow molding contact before the upper and lower push plates, that is: after the upper and lower half molds of blow molding contact, the pushing slopes of the upper and lower push plates begin to contact, and after the pushing slopes of the upper and lower push plates contact, they interact with each other to push the upper and lower half molds of blow molding forward synchronously. When the upper and lower mold seats of blow molding are closed, the upper half mold of blow molding just rests on the top wall of the upper half mold placement cavity, and the lower half mold of blow molding just rests on the top wall of the lower half mold placement cavity.
[0005] As a preferred solution, in the blow molding device for the injection-blow plastic bottle with a bottle mouth edge, the push slope on the lower push plate is arranged on the side away from the blow molding lower half mold, and the push slope on the upper push plate is arranged on the side close to the blow molding upper half mold, and correspondingly, a push hole is opened on the blow molding lower mold base facing the lower push plate, and a push cylinder is arranged on the blow molding lower mold base, and the piston rod of the push cylinder is arranged in the push hole.
[0006] As a preferred solution, in the blow molding device for the injection-blow plastic bottle with a bottle mouth edge, the outer end of the push-down plate is provided with a chamfer on a side close to the blow molding lower half mold.
[0007] As a preferred embodiment, in the blow molding device for the injection-blow plastic bottle with a bottle mouth edge, the limit block is a T-shaped limit block, and its specific installation method is: a limit installation through hole corresponding to the T-shaped limit block is opened on the blow molding upper mold base, and the T-shaped limit block is movably arranged in the limit installation through hole, and the lower part of the T-shaped limit block extends out from the limit installation through hole and is connected to the blow molding upper half mold.
[0008] As a preferred embodiment, in the blow molding device for the injection-blow plastic bottle with a bottle mouth edge, the specific connection method between the T-shaped limit block and the blow molding upper mold is: a limit installation through hole is opened on the T-shaped limit block, and a limit installation threaded hole corresponding to the limit installation through hole on the T-shaped limit block is opened on the blow molding upper mold, and a limit fixing screw is selected to pass through the limit installation through hole on the T-shaped limit block and tightened in the corresponding limit installation threaded hole on the blow molding upper mold.
[0009] As a preferred solution, in the blow molding device for injection-blow plastic bottles with bottle mouth edges, the limit mounting through hole on the T-shaped limit block is a stepped hole with a larger upper section and a smaller lower section, and the upper section of the limit mounting through hole cooperates with the cap of the limit fixing screw, and the cap of the limit fixing screw is buried in the upper section of the limit mounting through hole.
[0010] As a preferred solution, in the blow molding device for the injection-blow plastic bottle with a bottle mouth edge, the structures of the upper and lower mold elastic reset devices are the same. Taking the upper mold elastic reset device as an example, it includes: a reset spring, and a spring placement cavity opened on the top wall of the upper mold placement cavity, and the reset spring is arranged in the corresponding spring placement cavity.
[0011] As a preferred embodiment, in the blow molding device for the injection-blow plastic bottle with a bottle mouth edge, the specific arrangement of the spring placement cavity is as follows: a return spring placement hole is opened outward on the top wall of the upper half mold placement cavity, and the return spring placement hole is provided with a threaded section near the outer port, and a stud is provided in the threaded section of the return spring placement hole, and the return spring placement hole forms a spring placement cavity on the inner side of the stud.
[0012] The beneficial effects of the utility model are:
[0013] 1. The utility model provides upper and lower push plates, and mutually cooperating push slopes on the upper and lower push plates, and provides a limit block in the upper blow mold to allow the upper blow mold to leave the side wall of the upper mold placement cavity for a distance in the opening and closing direction of the upper and lower molds, so that the upper and lower molds are contacted before the upper and lower push plates, that is, the push slopes of the upper and lower push plates are contacted after the upper and lower molds are contacted, and after the push slopes of the upper and lower push plates are contacted, they interact with each other to push the upper and lower molds forward at the same time. When the upper and lower mold seats are closed, the upper blow mold just abuts against the top wall of the upper mold placement cavity, and the lower blow mold just abuts against the top wall of the lower mold placement cavity, thereby flattening the bottle mouth edge of the bottle blank.
[0014] 2. The utility model sets the push slope on the lower push plate at the side away from the lower blow mold, sets the push slope on the upper push plate at the side close to the upper blow mold, and opens a push hole on the lower blow mold base facing the lower push plate, and sets a push cylinder on the lower blow mold base, so that after the upper and lower blow molds are closed, the piston rod of the push cylinder passes through the push hole and presses against the lower push plate, so that the positions of the upper and lower blow molds do not shift during blow molding, and the bottle mouth edge of the bottle blank is always in a flattened state.
[0015] 3. The utility model provides a chamfer at the outer end of the lower push plate on one side close to the lower blow mold, so that when the upper and lower blow molds are closed, the lower push plate can be inserted between the upper push plate and the upper blow mold more smoothly.
[0016] 4. The installation structure of the limit block of the utility model is very simple and the installation is very convenient, which greatly improves the assembly efficiency and reduces the production cost.
[0017] 5. The utility model provides a reset spring placement hole, a threaded section is provided in the reset spring placement hole near the outer port, a stud is provided in the threaded section of the reset spring placement hole, so that the reset spring placement hole forms a spring placement cavity on the inner side of the stud, making the setting of the spring placement cavity simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the arrangement structure of the three-station injection-blowing device described in the background technology.
[0019] Figure 2 It is a schematic cross-sectional view of the blow molding device of the utility model when the mold is opened.
[0020] Figure 3 It is a schematic cross-sectional view of the blow molding device of the utility model when the mold is closed.
[0021] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure of part D.
[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of a plastic bottle with an uneven bottle mouth edge.
[0023] Figure 6 It is a schematic diagram of the cross-sectional structure of a plastic bottle with a flat bottle mouth edge.
[0024] Figures 1 to 6 The reference numerals in the figure are: 1, machine base, 2, turntable, 21, rotating shaft, 3, injection blow core, 4, barrel, 5, blow molding upper half mold, 50, blow molding upper template, 51, upper mold sliding seat, 510, limit installation through hole, 511, reset spring placement hole, 512, stud, 52, upper push plate, 521, push ramp, 54, reset spring, 55, guide column, 58, T-type limit block, 59, limit fixing Screws, 6, blow molding lower mold, 60, blow molding lower template, 61, lower mold sliding seat, 613, push through hole, 62, push plate, 621, push ramp, 622, chamfer, 64, return spring, 65, push cylinder, 7, injection molding upper mold, 70, injection molding upper template, 8, injection molding lower mold, 80, injection molding lower template, 9, plastic bottle, 90, bottle blank, 91, defective plastic bottle, 911, bottle mouth edge. DETAILED DESCRIPTION
[0025] The following describes in detail a specific implementation scheme of a blow molding device for an injection-blow plastic bottle with a bottle mouth edge according to the utility model by taking a three-station injection-blow device as an example in conjunction with the accompanying drawings.
[0026] like Figure 2 and Figure 3 As shown, the blow molding device of the injection blow plastic bottle with bottle mouth edge described in the utility model comprises: a blow molding lower mold base, a blow molding upper mold base which moves up and down relative to the blow molding lower mold base, and a blow molding upper mold base which moves with the injection blow plastic bottle. Figure 6The blow molding upper and lower half molds 5 and 6 corresponding to the plastic bottle 9 shown in the figure, the upper mold base includes: a blow molding upper mold plate 50 and an upper mold sliding base 51 arranged on the blow molding upper mold plate 50, the lower mold base includes: a blow molding lower mold plate 60 and a lower mold sliding base 61 arranged on the blow molding lower mold plate 60, an upper mold sliding base 51 is provided with an upper mold placement cavity corresponding to the blow molding upper half mold 5, the blow molding upper half mold 5 is movably arranged in the upper mold placement cavity of the upper mold sliding base 51, an upper push plate 52 is arranged on the end wall of the upper mold placement cavity corresponding to one end of the upper mold placement cavity of the upper mold sliding base 51, that is, its bottom wall, and an upper mold elastic reset device for pressing the blow molding upper half mold 5 against the upper push plate 52 is penetrated on the end wall of the upper mold placement cavity of the upper mold sliding base 51 at the other end, that is, its top wall. Figure 4 As shown, the specific structure of the upper mold elastic reset device includes: at least one reset spring 54, a reset spring placement hole 511 corresponding to the reset spring 54 is opened on the top wall of the upper mold placement cavity of the upper mold sliding seat 51, the reset spring placement hole 511 is provided with a threaded section near the outer port, a stud 512 is provided in the threaded section of the reset spring placement hole 511, the reset spring placement hole 511 forms a spring placement cavity on the inner side of the stud 512, and the reset spring 54 is arranged in the corresponding spring placement cavity on the upper mold sliding seat 51; a lower mold placement cavity corresponding to the blow molding lower mold 6 is opened in the lower mold sliding seat 61, and a lower push plate 62 is provided on the end wall of the corresponding end of the lower mold placement cavity of the lower mold sliding seat 61, that is, its bottom wall, and the outer end of the lower push plate 62 is at A chamfer 622 is provided on one side close to the blow molding lower half mold 6, and an end wall at the other end of the lower half mold placement cavity of the lower mold sliding seat 61, that is, its top wall, is penetrated with a lower half mold elastic reset device that presses the blow molding lower half mold 6 against the lower push plate 62. The specific structure of the lower half mold elastic reset device includes: at least one reset spring 64, and the mounting structure of the reset spring 64 is the same as the mounting structure of the reset spring 54, which will not be repeated here; in the mold opening state, the distance between the blow molding upper half mold 5 and the top wall of the upper half mold placement cavity of the upper mold sliding seat 51 when the blow molding lower half mold 6 is pressed against the upper push plate 52 is equal to the distance between the blow molding lower half mold 6 and the top wall of the lower half mold placement cavity of the lower mold sliding seat 61 when the blow molding lower half mold 6 is pressed against the lower push plate 62. The upper push plate 52 is provided with a push slope 521 (see Figure 4As shown), the lower push plate 62 is provided with a push slope 621 matched with the push slope 521 on the upper push plate 5 on the side away from the lower blow mold 6, and the upper mold sliding seat 51 is provided with a T-shaped limit block 58 connected to the upper blow mold 5 and away from the side wall of the upper mold placement cavity of the upper mold sliding seat 51 in the opening and closing direction of the upper and lower molds 5 and 6. The installation method of the T-shaped limit block 58 is as follows: a limit installation through hole 510 corresponding to the T-shaped limit block 58 is opened on the upper mold sliding seat 51, and the T-shaped limit block 58 is movably arranged in the limit installation through hole 510 of the upper mold sliding seat 51, and the lower part of the T-shaped limit block 58 extends out from the limit installation through hole 510, as shown in FIG. Figure 4 As shown, the specific connection method between the T-shaped limit block 58 and the upper blow molding mold 5 is as follows: a limit installation through hole is provided on the T-shaped limit block 58, and a limit installation threaded hole corresponding to the limit installation through hole on the T-shaped limit block 58 is provided on the upper blow molding mold 5. A limit fixing screw 59 is selected to pass through the limit installation through hole on the T-shaped limit block 58 and is tightened in the corresponding limit installation threaded hole on the upper blow molding mold 5 (it belongs to the conventional technology in this field and will not be described in detail here); in this embodiment, the limit installation through hole on the T-shaped limit block 58 is a stepped hole with a large upper section and a small lower section, and the upper section of the limit installation through hole cooperates with the cap of the limit fixing screw 59, and the cap of the limit fixing screw 59 is buried in the upper section of the limit installation through hole; the lower mold sliding seat 61 is provided with a push hole 66 facing the lower push plate 62. 13, the lower mold sliding seat 61 is provided with a push cylinder 65, and the piston rod of the push cylinder 65 is arranged in the push hole 613 of the lower mold sliding seat 61; in the process of closing the upper and lower molds 5 and 6, the upper and lower molds 5 and 6 are in contact with each other before the upper and lower push plates 52 and 62, that is, after the upper and lower molds 5 and 6 are in contact, the push slope 521 on the upper push plate 52 and the push slope 521 on the lower push plate 62 are in contact with each other. The push slope 521 on the upper push plate 52 contacts the push slope 621 on the lower push plate 62 and interacts with each other to push the upper and lower half molds 5 and 6 forward synchronously. When the upper and lower mold sliding seats 51 and 61 are closed, the upper half mold 5 just rests on the top wall of the upper half mold placement cavity of the upper mold sliding seat 51, and the lower half mold 6 just rests on the top wall of the lower half mold placement cavity of the lower mold sliding seat 61.
[0027] When the blow molding device described in the utility model is applied to an injection blow machine, a guide column 55 is usually arranged on the lower blow molding template 60, and the upper blow molding template 50 is slidably arranged on the guide column 55. The injection blow molding device also includes a machine base 1, an injection molding upper template 70, an injection molding lower template 80, an injection molding upper half mold 7 arranged on the injection molding upper template 70, an injection molding lower half mold 8 arranged on the injection molding lower template 80, and a turntable 2 movably arranged in the machine base 1 through a rotating shaft 21, and an injection blow core 3 is arranged on the turntable 2.
[0028] As is known to all, a three-station injection blow molding machine is usually provided with an injection molding station, a blow molding station and a demoulding station. Three sets of injection blow mold cores 3 are installed on the middle turntable 2. During operation, the turntable 2 descends, the blow molding upper half mold 5 and the injection molding upper half mold 7 descend, and the injection mold and the blow molding mold are molded together. At the injection molding station, the molten plastic enters the injection molding cavity through the barrel 4 and the hot runner, and the preform 90 is injection molded on the injection blow mold core 3. The temperature is maintained until the mold is opened, the blow molding upper half mold 5 and the injection molding upper half mold 7 rise, the turntable 2 rises, and then rotates 120° to transfer the injection blow mold core 3 with the preform 90 on the injection molding station to the blow molding station. The injection blow mold core 3 of the demoulding station is transferred to the injection molding station, and then the turntable 2 is lowered to the position, and the blow molding upper half mold 5 and the injection molding upper half mold 7 are lowered. At the blow molding station, the blow molding upper half mold 5 first contacts the blow molding lower half mold 6. Then, as the upper mold sliding seat 51 continues to descend, the upper push plate 52 pushes the lower push plate 62, so that the lower push plate 62 pushes the blow molding upper half mold 5 and the blow molding lower half mold 6 to move synchronously along the axial direction of the injection blow mold core 3 toward the turntable 2, and the bottle mouth edge of the deformed bottle blank 90 on the injection blow mold core 3 is pressed back to the injection blow mold core 3, until the blow molding upper half mold 5 and the blow molding lower half mold 6 are in place, and then the push cylinder 65 pushes The movable piston rod extends forward to support the lower push plate 62, and compressed air is blown into the injection-blowing core 3 of the blow-molding station to blow-mold the bottle blank 90 into a bottle, that is, a plastic bottle 9. The injection-molding cavity of the injection-molding station is injected with molten plastic, and the bottle blank 90 is formed by keeping it warm to a certain temperature. Then the mold is opened, and the blow-molding upper half mold 5 and the blow-molding lower half mold 6 rise. In this process, after the blow-molding upper half mold 5 is disengaged from the lower push plate 62, it moves to a position away from the turntable 2 under the action of the return spring 54. Then, the turntable 2 rises to its position and then rotates, and the injection-blowing core 3 with the plastic bottle 9 of the blow-molding station is transferred to the demolding station. The injection-blowing core 3 on the demolding station is transferred to Injection molding station, the injection molding station with the injection-blowing core 3 of the bottle blank 90 is transferred to the blow molding station, while the turntable 2 rotates, the push cylinder 65 moves the piston rod backward, and the push plate 62 and the blow molding lower half mold 6 move to the position away from the turntable 2 under the action of the return spring 64. After the turntable 2 rotates 120° into position, the turntable 2 is lowered into position, the injection molding upper and lower half molds 7 and 8, and the blow molding upper and lower half molds 5 and 6 are respectively closed into position, and the bottle blank 90 is injection molded at the injection molding station, and the plastic bottle 9 is blow molded at the blow molding station, and the plastic bottle 9 is removed from the injection-blowing core 3 at the demolding station, and the cycle is repeated.
[0029] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made to the shape, structure, characteristics and spirit described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.
Claims
1. A blow molding device for injection-blow plastic bottles with a bottle mouth edge, comprising: The blowing lower mold base and the blowing upper mold base that move up and down relative to the blowing lower mold base, as well as the blowing upper half mold and the blowing lower mold corresponding to the injection blow plastic bottle; it is characterized in that the blowing upper mold base is provided with an upper half mold placement cavity corresponding to the blowing upper half mold, the blowing upper half mold is movably arranged in the upper half mold placement cavity, the end wall of the corresponding one end of the upper half mold placement cavity, that is, its bottom wall is provided with an upper half mold elastic reset device for pressing the blowing upper half mold against the upper push plate, and the blowing lower mold base is provided with a lower half mold placement cavity corresponding to the blowing lower mold, the end wall of the corresponding one end of the lower mold placement cavity, that is, its bottom wall is provided with a lower push plate, and the end wall of the other end of the lower mold placement cavity, that is, its top wall, is provided with a lower half mold elastic reset device for pressing the blowing lower half mold against the lower push plate, and the blowing upper half mold is pressed against When the upper push plate is on, the distance between it and the top wall of the upper mold placement cavity is equal to the distance between it and the top wall of the lower mold placement cavity when the blow molding lower mold is pressed against the lower push plate. The upper and lower push plates are provided with pushing slopes that cooperate with each other. The blow molding upper mold seat is provided with a limit block connected to the blow molding upper mold and away from the side wall of the upper mold placement cavity in the opening and closing direction of the blow molding upper and lower molds in the open mold state. In the mold closing process of the blow molding upper and lower molds, the blow molding upper and lower molds contact before the upper and lower push plates, that is, after the blow molding upper and lower molds contact, the pushing slopes of the upper and lower push plates begin to contact. After the pushing slopes of the upper and lower push plates contact, they interact with each other to push the blow molding upper and lower molds forward synchronously. When the blow molding upper and lower mold seats are closed, the blow molding upper mold just rests on the top wall of the upper mold placement cavity, and the blow molding lower mold just rests on the top wall of the lower mold placement cavity.
2. A blow molding device for injection-blow plastic bottles with a bottle mouth edge according to claim 1, characterized in that: The pushing slope on the lower push plate is arranged on the side away from the lower half mold of the blow molding, and the pushing slope on the upper push plate is arranged on the side close to the upper half mold of the blow molding. Correspondingly, a pushing hole is opened on the lower push plate of the blow molding lower mold base, and a pushing cylinder is arranged on the lower blow molding mold base, and the piston rod of the pushing cylinder is arranged in the pushing hole.
3. A blow molding device for injection-blow plastic bottles with a bottle mouth edge according to claim 2, characterized in that: The outer end of the push-down plate is provided with a chamfer on one side close to the lower blow molding mold.
4. The blow molding device for injection-blow plastic bottles with bottle mouth edges according to claim 1, characterized in that: The limit block is a T-shaped limit block, and its specific installation method is: a limit installation through hole corresponding to the T-shaped limit block is opened on the blow molding upper mold base, the T-shaped limit block is movably arranged in the limit installation through hole, and the lower part of the T-shaped limit block extends out from the limit installation through hole and is connected to the blow molding upper half mold.
5. A blow molding device for injection-blow plastic bottles with a bottle mouth edge according to claim 4, characterized in that: The specific connection method between the T-shaped limit block and the upper blow molding mold is as follows: a limit installation through hole is provided on the T-shaped limit block, and a limit installation threaded hole corresponding to the limit installation through hole on the T-shaped limit block is provided on the upper blow molding mold. A limit fixing screw is selected to pass through the limit installation through hole on the T-shaped limit block and is tightened in the corresponding limit installation threaded hole on the upper blow molding mold.
6. A blow molding device for injection-blow plastic bottles with a bottle mouth edge according to claim 5, characterized in that: The limit installation through hole on the T-shaped limit block is a stepped hole with a large upper section and a small lower section. The upper section of the limit installation through hole matches the cap of the limit fixing screw, and the cap of the limit fixing screw is buried in the upper section of the limit installation through hole.
7. A blow molding device for injection-blow plastic bottles with a bottle mouth edge according to any one of claims 1 to 6, characterized in that: The structures of the upper and lower mold elastic reset devices are the same. Taking the upper mold elastic reset device as an example, it includes: a reset spring and a spring placement cavity opened on the top wall of the upper mold placement cavity, and the reset spring is arranged in the corresponding spring placement cavity.
8. The blow molding device for injection-blow plastic bottles with bottle mouth edges according to claim 7, characterized in that: The specific setting method of the spring placement cavity is: a reset spring placement hole is opened outward on the top wall of the upper half mold placement cavity, a threaded section is provided in the reset spring placement hole near the outer port, a stud is provided in the threaded section of the reset spring placement hole, and the reset spring placement hole forms a spring placement cavity on the inner side of the stud.