A self-cleaning injection molding structure for an injection molding machine

Abstract

The application relates to the technical field of plastic bottle production, in particular to a self-cleaning injection structure for an injection molding machine, which comprises an injection molding station and a cleaning station, a main pipeline, a first branch pipeline and a second branch pipeline, the first branch pipeline and the second branch pipeline are both communicated with the main pipeline, the main pipeline is used for feeding molten plastic into the first branch pipeline and the second branch pipeline, an injection head one and an injection head two, the injection head one is communicated with the first branch pipeline, the injection head two is communicated with the second branch pipeline, a valve is arranged on the first branch pipeline and the second branch pipeline, a switching assembly is used for switching the injection head one and the injection head two between the injection molding station and the cleaning station, and a cleaning assembly comprises a box body and a heating piece, the box body is arranged in the cleaning station, and the heating piece is arranged in the box body and used for heating the injection head one or the injection head two located in the cleaning station. The application can clean the cooled plastic in the injection head, reduce the plastic residues in the injection head, and avoid blockage.

Description

Technical Field

[0001] This application relates to the field of plastic bottle manufacturing technology, and in particular to an injection molding structure for a self-cleaning injection molding machine. Background Technology

[0002] Blow molding is one of the most economical and common methods for manufacturing hollow plastic containers. The basic process is as follows: extrusion or injection to form a tubular preform → placing the preform in a mold → injecting high-pressure air into the preform to make it adhere tightly to the mold cavity → cooling and demolding to obtain the final product. In the production of the tubular preform, hot-melt plastic is injected into the mold through an injection head.

[0003] When the equipment stops working, some hot-melt plastic remains in the injection head. After a period of time, it cools and solidifies inside the injection head, which can easily cause blockage. The blocked plastic is located inside the injection head and exposed to the air. Dust in the air can easily adhere to the blocked plastic through the injection head. During the next injection, some of the blocked plastic will melt due to the high temperature of the molten plastic. At this time, the dust will also be incorporated into the molten plastic, affecting the quality of the tubular preform. Utility Model Content

[0004] The purpose of this application is to provide a self-cleaning injection molding structure for injection molding machines, which can clean the cooled plastic inside the injection head, reduce plastic residue inside the injection head, and avoid clogging.

[0005] The self-cleaning injection molding structure for injection molding machines provided in this application adopts the following technical solution: A self-cleaning injection molding machine structure, comprising: Injection molding station and cleaning station; The system includes a main pipe, a branch pipe 1, and a branch pipe 2, both of which are connected to the main pipe. The main pipe is used to introduce molten plastic into the branch pipes 1 and 2. Injection head one and injection head two, wherein the injection head is connected to the first branch pipe and the second injection head is connected to the second branch pipe; Valves are installed on both the first branch pipe and the second branch pipe; A switching component is used to switch the first injection head and the second injection head between the injection station and the cleaning station; A cleaning assembly includes a housing and a heating element. The housing is disposed at the cleaning station, and the heating element is disposed within the housing and is used to heat either injection head one or injection head two located at the cleaning station.

[0006] Optionally, it also includes a first driving component, wherein both the first injection head and the second injection head are mounted on the output end of the first driving component, and the first driving component is used to drive the first injection head and the second injection head to move toward or away from the housing.

[0007] Optionally, the switching component includes a turntable and a rotating component, wherein both the first injection head and the second injection head are mounted on the turntable, and the rotating component is used to drive the turntable to rotate.

[0008] Optionally, the turntable is gear-shaped, and the rotating component includes a drive gear and a second drive component. The drive gear meshes with the turntable, and the second drive component is used to drive the drive gear to rotate.

[0009] Optionally, it also includes a frame, which is rotatably connected to the turntable and the drive gear, respectively, and the second drive component is mounted on the frame, which is mounted on the output end of the first drive component.

[0010] Optionally, a third driving component is also included, with the housing installed at the output end of the third driving component. The third driving component is used to drive the housing to move closer to or further away from the first injection head or the second injection head located at the cleaning station.

[0011] This application cleans clogged injection head one or injection head two by setting up a box and heating element, that is, melting the solidified plastic in injection head one or injection head two again and letting it flow into the box. This not only avoids clogging of injection head one or injection head two, but also removes the dust in injection head one or injection head two, so as to avoid affecting the quality of molten plastic during re-injection and avoid the generation of defective products. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of an injection molding structure for a self-cleaning injection molding machine according to an embodiment of this application.

[0013] Figure 2 This is a schematic diagram of the structure of the cleaning component in the embodiments of this application.

[0014] In the diagram, 1. Main pipe; 2. Branch pipe one; 3. Branch pipe two; 4. Injection head one; 5. Injection head two; 6. Switching assembly; 61. Turntable; 62. Rotating component; 621. Drive gear; 622. Second drive component; 7. Frame; 8. First drive component; 9. Cleaning assembly; 91. Box; 92. Heating component; 10. Third drive component; 20. Valve. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail below.

[0016] A self-cleaning injection molding structure for injection molding machines, referenced Figure 1 It includes an injection molding station and a cleaning station. The injection molding station is used to inject and form tubular preforms, while the cleaning station is used to clean the injection head to prevent clogging and dust accumulation.

[0017] Specifically, the self-cleaning injection molding machine structure also includes a main pipe 1, a first branch pipe 2, and a second branch pipe 3. Both the first and second branch pipes 2 and 3 are connected to the main pipe 1. The main pipe 1 is used to introduce molten plastic into the first and second branch pipes 2 and 3. In some embodiments, the main pipe 1 is connected to the feeding and heating parts of the injection molding machine to transport molten plastic particles (i.e., molten plastic). The main pipe 1 can be connected to the first and second branch pipes 2 and 3 via a three-way valve, or the main pipe 1 can be integrally formed with the first and second branch pipes 2 and 3.

[0018] Injection head 4 is installed on branch pipe 1 (2), and injection head 5 is installed on branch pipe 2 (3). The main pipe 1 can pass hot melt plastic into injection head 4 and injection head 5. Specifically, injection head 4 can be installed on branch pipe 1 (2) via a quick-release connector, and injection head 5 can be installed on branch pipe 2 (3) via a quick-release connector.

[0019] In some embodiments, when injection head 4 is in the injection station, molten plastic can be injected into the mold to form a tubular preform. At this time, injection head 5 is in the cleaning station, where it can be cleaned to prevent clogging. When injection head 4 needs cleaning, the positions of injection head 4 and injection head 5 are switched, allowing injection head 4 to clean while injection head 5 performs the injection work. This avoids long waiting times before injection head 4 or 5 can finish cleaning, thus increasing injection efficiency.

[0020] In some embodiments, valves 20 are provided on both branch pipe 2 and branch pipe 3. Valves 20 are used to control the opening and closing of branch pipe 2 and / or branch pipe 3. When injection head 4 is in the injection position, valve 20 on branch pipe 2 is open and valve 20 on branch pipe 3 is closed, and vice versa. Valves 20 can be clamp valves, ball valves (high temperature type), butterfly valves (high temperature type), etc.

[0021] Specifically, the switching assembly 6 allows injection heads 4 and 5 to switch positions, enabling them to move back and forth between the injection molding station and the cleaning station. The switching assembly 6 includes a turntable 61 and a rotating component 62. Both injection heads 4 and 5 are mounted on the turntable 61, and the rotating component 62 drives the turntable 61 to rotate. Preferably, injection heads 4 and 5 are symmetrically arranged about the central axis of the turntable 61. Rotating the turntable 61 by 180 degrees allows for the switching of the positions of injection heads 4 and 5, thus enabling them to move back and forth between the cleaning station and the injection molding station.

[0022] In some embodiments, the turntable 61 is gear-shaped, meaning that teeth are arranged around its outer circumference. The rotating component 62 includes a drive gear 621 and a second drive component 622. The drive gear 621 meshes with the turntable 61, and the second drive component 622 drives the drive gear 621 to rotate, thereby rotating the turntable 61 to achieve position switching between injection head 4 and injection head 5. Furthermore, by setting the drive gear 621, the second drive component 622 can be positioned on one side of the turntable 61, making it more convenient to maintain or replace the second drive component 622. The second drive component 622 is preferably a motor.

[0023] In some embodiments, the mold on the injection station can be moved up and down by a telescopic cylinder, so that the mold moves up and is inserted into the injection head 4 or the injection head 5, so that the injection head 4 or the injection head 5 can perform injection work.

[0024] In some embodiments, the mold at the injection station does not move up and down. Instead, the injection head 4 or injection head 5 is inserted into the mold by moving up and down to perform injection molding. Specifically, a first drive member 8 is also included. Both injection head 4 and injection head 5 are mounted on the output end of the first drive member 8. The first drive member 8 drives the injection head 4 and injection head 5 to move closer to or further away from the mold.

[0025] Specifically, it also includes a frame 7, which is fixed to the output end of the first driving member 8. The frame 7 is U-shaped and its two ends are rotatably connected to the driving gear 621 and the turntable 61, respectively. The first driving member 8 drives the frame 7 to move, thereby driving the turntable 61 and the driving gear 621 to move simultaneously. The second driving member 622 is fixedly installed on the frame 7 and its output end is connected to the driving gear 621. The second driving member 622 drives the driving gear 621 to rotate. The first driving member 8 is preferably a linear guide rail.

[0026] Reference Figure 1 and Figure 2In some embodiments, a cleaning component 9 is provided at the cleaning station. The cleaning component 9 is used to clean the injection head 4 or the injection head 5 to prevent clogging. The cleaning component 9 includes a housing 91 and a heating element 92. The housing 91 is located at the cleaning station, and the heating element 92 is located inside the housing 91 and is used to clean the injection head 4 or the injection head 5 located at the cleaning station. When cleaning of injection head 4 or injection head 5 is required, the first driving component 8 moves injection head 4 or injection head 2 towards the housing 91, so that injection head 4 or injection head 2 is inserted into the housing 91. At this time, the heating component 92 heats injection head 4 or injection head 2, causing the plastic solidified on injection head 4 or injection head 2 to melt and flow out again, thereby carrying out the dust inside injection head 4 or injection head 2. This reduces the possibility of clogging of injection head 4 or injection head 2, and also reduces the amount of dust inside injection head 4 or injection head 2, thus avoiding the generation of defective products.

[0027] The heating element 92 can be a heating wire, which can be arranged around the inner wall of the box 91. The heating element 92 can also be a heating tube, which can be installed on each inner wall of the box 91, or only on two mutually symmetrical inner walls.

[0028] In some embodiments, a third drive member 10 is also included. The housing 91 is fixedly installed at the output end of the third drive member 10. The third drive member 10 is used to drive the housing 91 to move closer to or away from the injection head 4 or injection head 5 located at the cleaning station. Because of the third driving component 10, the housing 91 can be moved by the third driving component 10. Even if the injection head 4 or injection head 5 in the injection molding station is not performing injection work (i.e., the first driving component 8 is not driving the turntable 61 to move), the housing 91 can still be moved by the third driving component 10, so that the injection head 4 or injection head 5 in the cleaning station can be inserted into the housing 91 for cleaning. Moreover, the depth of the housing 91 is relatively deep, which does not affect the subsequent injection work. That is, when the injection head 4 or injection head 2 5 is inserted into the housing 91 for cleaning, the first driving component 8 drives the turntable 61 to move, so that the injection head 4 or injection head 2 5 in the injection molding station can be inserted into the mold for injection. The injection head 4 or injection head 2 5 in the cleaning station moves inside the housing 91 and will not hit the inner wall of the housing 91 due to the housing 91 being too shallow. This allows cleaning and injection to be performed simultaneously, increasing efficiency.

[0029] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-cleaning injection molding structure for an injection molding machine, characterized in that, include: Injection molding station and cleaning station; The main pipe (1), branch pipe one (2) and branch pipe two (3) are connected to the main pipe (1). The main pipe (1) is used to introduce molten plastic into the branch pipe one (2) and the branch pipe two (3). Injection head one (4) and injection head two (5), the injection head is connected to the branch pipe one (2), and the injection head two (5) is connected to the branch pipe two (3); Valves (20) are installed on both the first branch pipe (2) and the second branch pipe (3); The switching component (6) is used to drive the first injection head (4) and the second injection head (5) to switch between the injection station and the cleaning station; The cleaning assembly (9) includes a housing (91) and a heating element (92). The housing (91) is disposed at the cleaning station, and the heating element (92) is disposed inside the housing (91) and is used to heat the first injection head (4) or the second injection head (5) located at the cleaning station.

2. The self-cleaning injection molding structure for an injection molding machine according to claim 1, characterized in that, It also includes a first drive unit (8), wherein the first injection head (4) and the second injection head (5) are both installed at the output end of the first drive unit (8), and the first drive unit (8) is used to drive the first injection head (4) and the second injection head (5) to move toward or away from the housing (91).

3. The self-cleaning injection molding structure for an injection molding machine according to claim 2, characterized in that, The switching component (6) includes a turntable (61) and a rotating component (62). The first injection head (4) and the second injection head (5) are both mounted on the turntable (61). The rotating component (62) is used to drive the turntable (61) to rotate.

4. The self-cleaning injection molding structure for an injection molding machine according to claim 3, characterized in that, The turntable (61) is gear-shaped, and the rotating component (62) includes a drive gear (621) and a second drive component (622). The drive gear (621) meshes with the turntable (61), and the second drive component (622) is used to drive the drive gear (621) to rotate.

5. The self-cleaning injection molding structure for an injection molding machine according to claim 4, characterized in that, It also includes a frame (7), which is rotatably connected to the turntable (61) and the drive gear (621) respectively. The second drive component (622) is installed on the frame (7), and the frame (7) is installed at the output end of the first drive component (8).

6. A self-cleaning injection molding structure for an injection molding machine according to any one of claims 1 to 5, characterized in that, It also includes a third drive unit (10), the housing (91) is installed at the output end of the third drive unit (10), the third drive unit (10) is used to drive the housing (91) to move closer to or further away from the first injection head (4) or the second injection head (5) located at the cleaning station.

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