Polyethylene material double-color injection molding mechanism and device

Abstract

The utility model relates to the technical field of injection molding, and particularly discloses a polyethylene material double-color injection molding mechanism and device.The polyethylene material double-color injection molding mechanism comprises an upper die set and a lower die set, the upper die set is provided with a first cavity and a second cavity, the lower die set is provided with a first core and a second core, the first cavity is matched with the first core, and the second cavity is matched with the second core; the second mold cavity and the second mold core are oppositely arranged and are matched with each other; the first mold core and the second mold core are in central symmetry; the mounting plate is arranged on the side, away from the upper module, of the lower module, the rotating assembly comprises a rotating disc and a positioning piece, the rotating disc is rotationally connected to the mounting plate, the positioning piece is arranged on the peripheral wall of the rotating disc, a positioning groove is formed in the mounting plate, and the positioning piece can be embedded into the positioning groove. The rotating precision of the rotating disc can be guaranteed, so that a better injection molding effect is achieved.

Description

Technical Field

[0001] This application relates to the technical field of injection molding, and in particular to a two-color injection molding mechanism and apparatus for polyethylene material. Background Technology

[0002] Two-color injection molds are a special type of injection mold that injects different materials twice on the same injection molding machine. This is achieved by moving the mold section or switching the injection port. Through this process, products with two colors or two material properties can be produced in a single molding process.

[0003] Two-color injection molds include rotary molds and sliding molds. In rotary molds, after the first color is injected, the mold rotates a certain angle, usually 180 degrees, for the second color to be injected. However, after long-term use, the rotation angle can easily deviate, and insufficient rotation precision can lead to errors during mold closing, thus affecting the injection molding effect. Utility Model Content

[0004] To address the problem of rotational deviation in existing injection molding mechanisms, this application provides a two-color injection molding mechanism and apparatus for polyethylene materials.

[0005] On the one hand, the two-color injection molding mechanism for polyethylene material provided in this application adopts the following technical solution:

[0006] A two-color injection molding mechanism for polyethylene material, comprising:

[0007] The upper module has a first cavity and a second cavity, and the lower module has a first core and a second core. The first cavity and the first core are adapted to each other, and the second cavity and the second core are arranged opposite to each other and adapted to each other. The first core and the second core are centrally symmetrical.

[0008] The rotating assembly includes a rotating plate and a mounting plate. The mounting plate is located on the side of the lower module away from the upper module. The rotating assembly includes a turntable and a positioning component. The turntable is rotatably connected to the mounting plate. The positioning component is located on the outer peripheral wall of the turntable. The mounting plate has a positioning groove for the positioning component to be inserted.

[0009] By adopting the above technical solution, the turntable can be further positioned by inserting the positioning component into the positioning groove, so as to achieve a better positioning effect and thus ensure the mold closing accuracy of the injection molding mechanism.

[0010] In some embodiments, the positioning element includes at least one first positioning element and at least one second positioning element, the first positioning element and the second positioning element have different structures, the positioning groove includes at least two first positioning grooves and at least two second positioning grooves, the first positioning groove is adapted to the first positioning element, the second positioning groove is adapted to the second positioning element, the first positioning groove and the second positioning groove are spaced apart along the outer peripheral wall of the turntable, and the included angle is 90°.

[0011] By adopting the above technical solution, and by setting the first positioning member and the second positioning member to different structures, the first positioning member can be limited once by the first positioning groove, and the second positioning member can be limited twice by the second positioning groove. This helps to achieve a better positioning effect, further ensures the positioning accuracy of the turntable, and also minimizes the risk of the turntable deflecting under the action of external forces.

[0012] In some embodiments, the cross-section of the first positioning member is either a polygon or an irregular shape, and the cross-section of the second positioning member is either a polygon or an irregular shape.

[0013] By adopting the above technical solution, the shapes of the first positioning component and the second positioning component can achieve a better positioning effect on the turntable.

[0014] In some embodiments, a fixed plate is provided on the side of the mounting plate away from the lower module, and a drive assembly is provided between the mounting plate and the fixed plate. The drive assembly includes a first drive source and a second drive source. The first drive source is mounted on the fixed plate and is connected to the turntable through the mounting plate to drive the turntable to rotate. One end of the second drive source is provided on the mounting plate, and the other end is connected to the fixed plate to drive the first drive source and the turntable to rise and fall.

[0015] By adopting the above technical solution, the turntable is first driven by the second drive source to move away from the mounting plate, then the turntable is rotated 180° by the first drive source, and then the turntable is moved by the second drive source to move closer to the mounting plate, so that the first positioning component on the turntable is embedded in the first positioning groove and the second positioning component is embedded in the second positioning groove, thereby achieving further positioning of the turntable.

[0016] In some embodiments, the mounting plate has a rotating groove that communicates with the first positioning groove and the second positioning groove. The depth of the rotating groove is greater than the depth of the first positioning groove and the second positioning groove. The rotating groove is used for at least a portion of the first positioning member and the second positioning member to be inserted, and the first positioning member and the second positioning member can be slidably disposed in the rotating groove.

[0017] By adopting the above technical solution and setting a rotating groove, the rotation of the turntable can be guided. By connecting the rotating groove with the first positioning groove and the second positioning groove, when the turntable rotates to the appropriate position, the second drive source drives the turntable, so that the first positioning member is embedded in the first positioning groove and the second positioning member is embedded in the second positioning groove, so as to facilitate the positioning of the turntable.

[0018] In some embodiments, a positioning pin is provided on the side of the upper module facing the lower module, and a pin groove is provided on the side of the lower module facing the upper module. The positioning pin is adapted to the pin groove, and the outer diameter of the positioning pin gradually decreases along the side away from the upper module.

[0019] By adopting the above technical solution and setting positioning pins, positioning between the upper and lower modules can be achieved. Since the outer diameter of the positioning pins gradually decreases along the side away from the lower module, the positioning accuracy can be further improved, so as to achieve precise positioning between the upper and lower modules.

[0020] In some embodiments, a magnetic attractor is provided in the pin slot, and a magnetic metal is provided on the positioning pin, with the magnetic attractor and the magnetic metal being attracted by magnetism.

[0021] By adopting the above technical solution, the magnetic attraction between the magnetic component and the magnetic metal can further realize the connection between the upper and lower modules when the mold is closed, which helps to achieve a better connection effect and also facilitates the separation of the upper and lower modules.

[0022] In some embodiments, the first positioning member is detachably connected to the turntable, and the second positioning member is detachably connected to the turntable.

[0023] By adopting the above technical solution, when the first or second positioning component is worn or loose, it is convenient to replace the first or second positioning component, thereby enhancing the service life of the rotating mechanism.

[0024] In some embodiments, a first mounting groove and a second mounting groove are provided on the side wall of the turntable. A first positioning member is inserted into the first mounting groove, and a second positioning member is inserted into the second mounting groove. The side wall of the first positioning member contacts the inner wall of the first mounting groove. A first fastener is inserted between the first positioning member and the turntable. The side wall of the second positioning member contacts the inner wall of the second mounting groove, and a second fastener is inserted between the second positioning member and the turntable.

[0025] By adopting the above technical solution, and by setting the first mounting slot and the second mounting slot, the offset of the first positioning component and the second positioning component along the circumference of the turntable can be avoided as much as possible. By setting the first fastener and the second fastener, the connection effect between the first positioning component and the second positioning component and the turntable can be guaranteed, which facilitates installation and disassembly.

[0026] On the other hand, this application provides a polyethylene material two-color injection molding apparatus, including any of the polyethylene material two-color injection molding mechanisms as described above.

[0027] Compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0028] 1. By setting positioning components, rotational accuracy can be ensured after the lower mold unit rotates, which helps to achieve better mold closing accuracy and thus ensures injection molding effect;

[0029] 2. By setting at least two positioning parts of different shapes, it is helpful to further improve rotational accuracy and achieve better mold closing accuracy;

[0030] 3. By making the first and second positioning components detachable, installation and disassembly are facilitated, which helps to improve the product's service life. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0032] Figure 2 This is a top view of an embodiment of this application.

[0033] Figure 3 This is a cross-sectional view of the turntable in an embodiment of this application.

[0034] Figure 4 This is a schematic diagram of the structure of the driving component in the embodiments of this application.

[0035] Figure 5 This is a schematic diagram of the connection relationship between the turntable and the positioning component in an embodiment of this application.

[0036] In the picture:

[0037] 1. Upper module; 11. First cavity; 12. Second cavity; 13. Positioning pin; 2. Lower module; 21. First core; 22. Second core; 23. Pin slot; 3. Rotating assembly; 31. Turntable; 32. Positioning component; 33. First positioning component; 34. Second positioning component; 35. First mounting slot; 36. Second mounting slot; 37. First fastener; 38. Second fastener; 4. Mounting plate; 41. Positioning slot; 42. First positioning slot; 43. Second positioning slot; 44. Rotating slot; 5. Drive assembly; 50. Fixing plate; 51. First drive source; 52. Second drive source. Detailed Implementation

[0038] The following will refer to the appendices in the embodiments of this application. Figure 1-5 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0040] Reference Figure 1 This application provides a two-color injection molding mechanism for polyethylene material, including an upper mold assembly 1 and a lower mold assembly 2. The lower mold assembly 2 is positioned close to or away from the upper mold assembly 1 along a guide rod. The upper mold assembly 1 has a first cavity 11 and a second cavity 12, and the lower mold assembly 2 has a first core 21 and a second core 22. The first cavity 11 and the second core 22 are opposite to and adapted to each other, and the second cavity 12 and the second core 22 are opposite to and adapted to each other. The first cavity 11 and the second cavity 12 are centrally symmetrical. After the upper mold assembly 1 and the lower mold assembly 2 are closed, the first color is injected first. After the first color cools and solidifies, the lower mold assembly 2 rotates 180 degrees and then the second color is injected to achieve two-color injection molding.

[0041] Reference Figure 1 and Figure 2 The dual-color injection molding mechanism also includes a rotating component 3 and a mounting plate 4. The mounting plate 4 is located on the side of the lower mold group 2 away from the upper mold group 1. The rotating component 3 includes a turntable 31 and a positioning element 32. The turntable 31 is rotatably connected to the mounting plate 4, and the positioning element 32 is located on the outer peripheral wall of the turntable 31. The mounting plate 4 has a positioning groove 41 for the positioning element 32 to be inserted. By inserting the positioning element 32 into the positioning groove 41, the turntable 31 can be further positioned to achieve a better positioning effect, minimize the deviation of the turntable 31's position, and thus ensure the mold closing accuracy of the injection molding mechanism.

[0042] Specifically, in this embodiment, the positioning element 32 includes at least one first positioning element 33 and at least one second positioning element 34. The first positioning element 33 and the second positioning element 34 have different structures. The positioning groove 41 includes at least two first positioning grooves 42 and at least two second positioning grooves 43. The first positioning grooves 42 are adapted to the first positioning element 33, and the second positioning grooves 43 are adapted to the second positioning element 34. The first positioning grooves 42 and the second positioning grooves 43 are spaced apart along the outer peripheral wall of the turntable 31, and the included angle is 90°. In this embodiment, one first positioning element 33 and one second positioning element 34 are provided, and two first positioning grooves 42 and two second positioning grooves 43 are provided. By setting the first positioning element 33 and the second positioning element 34 with different structures, the first positioning element 33 can be limited once by the first positioning groove 42, and the second positioning element 34 can be limited a second time by the second positioning groove 43. This helps to achieve a better positioning effect, further ensures the positioning accuracy of the turntable 31, and also minimizes the risk of the turntable 31 deflecting under the action of external forces.

[0043] Furthermore, the cross-section of the first positioning member 33 is either a polygon or an irregular shape, and the cross-section of the second positioning member 34 is either a polygon or an irregular shape. It is easy to understand that the first positioning member 33 can be a triangular pyramid, a cuboid, a semi-cylinder, or similar structure, and the second positioning member can also be a triangular pyramid, a cuboid, a semi-cylinder, or similar structure. In this embodiment, the first positioning member 33 is preferably a triangular pyramid, and the second positioning member 34 is preferably a cuboid.

[0044] Reference Figure 4 In some embodiments, a fixing plate 50 is provided on the side of the mounting plate 4 away from the lower module 2. A drive assembly 5 is provided between the mounting plate 4 and the fixing plate 50. The drive assembly 5 includes a first drive source 51 and a second drive source 52. The first drive source 51 is mounted on the fixing plate 50 and passes through the mounting plate 4 to be connected to the turntable 31 to drive the turntable 31 to rotate. In this embodiment, the first drive source 51 is specifically a motor. The first drive source 51 and the turntable 31 can be linked by a gear set, a chain, or a pulley, which is not limited here. One end of the second drive source 52 is provided on the mounting plate 4, and the other end is connected to the fixing plate 50 to drive the first drive source 51 and the turntable 31 to rise and fall. The second drive source 52 is specifically a cylinder.

[0045] First, the turntable 31 is driven to move away from the mounting plate 4 by the second drive source 52, so that the first positioning member 33 moves out of the first positioning groove 42 and the second positioning member 34 moves out of the second positioning groove 43. Then, the turntable 31 is rotated 180° by the first drive source 51. Then, the turntable 31 is moved closer to the mounting plate 4 by the second drive source 52, so that the first positioning member 33 on the turntable 31 is inserted into the first positioning groove 42 and the second positioning member 34 is inserted into the second positioning groove 43, so as to achieve further positioning of the turntable 31.

[0046] Furthermore, referring to Figure 2 and Figure 3 The mounting plate 4 has a rotating groove 44, which communicates with the first positioning groove 42 and the second positioning groove 43. The depth of the rotating groove 44 is greater than the depth of the first positioning groove 42 and the second positioning groove 43. The rotating groove 44 is used for at least part of the first positioning member 33 and the second positioning member 34 to be inserted, and the first positioning member 33 and the second positioning member 34 can be slidably disposed in the rotating groove 44. By providing the rotating groove 44, the rotation of the turntable 31 can be guided, facilitating positioning operations.

[0047] Reference Figure 5In some embodiments, the first positioning member 33 is detachably connected to the turntable 31, and the second positioning member 34 is detachably connected to the turntable 31. Specifically, the turntable 31 has a first mounting groove 35 and a second mounting groove 36 on its side wall. The first positioning member 33 is inserted into the first mounting groove 35, and the second positioning member 34 is inserted into the second mounting groove 36. The side wall of the first positioning member 33 contacts the inner wall of the first mounting groove 35. A first fastener 37 is inserted between the first positioning member 33 and the turntable 31. The side wall of the second positioning member 34 contacts the inner wall of the second mounting groove 36, and a second fastener 38 is inserted between the second positioning member 34 and the turntable 31. It is understood that the first fastener 37 and the second fastener 38 are both screws in this embodiment.

[0048] By providing the first mounting slot 35 and the second mounting slot 36, the offset of the first positioning member 33 and the second positioning member 34 along the circumference of the turntable 31 can be minimized. By providing the first fastener and the second fastener 38, the connection between the first positioning member 33 and the second positioning member 34 and the turntable 31 can be guaranteed, facilitating installation and disassembly. When the first positioning member 33 or the second positioning member 34 becomes worn or loose, it is easy to replace the first positioning member 33 and the second positioning member 34, thereby extending the service life of the rotating mechanism.

[0049] Furthermore, referring to Figure 1 A positioning pin 13 is provided on the side of the upper module 1 facing the lower module 2, and a pin groove 23 is provided on the side of the lower module 2 facing the upper module 1. The positioning pin 13 is adapted to the pin groove 23, and the outer diameter of the positioning pin 13 gradually decreases along the side away from the upper module 1. By setting the positioning pin 13, positioning between the upper module 1 and the lower module 2 can be achieved. Since the outer diameter of the positioning pin 13 gradually decreases along the side away from the upper module 1, the positioning accuracy can be further improved to achieve precise positioning between the upper module 1 and the lower module 2. A magnetic attracting element (not shown in the figure) is provided in the pin groove 23, and a magnetic metal is provided on the positioning pin 13. The magnetic attracting element and the magnetic metal are attracted by magnetism. In this embodiment, the magnetic attracting element is specifically a magnet, and the magnetic metal can be iron, cobalt, nickel, or other metals and their alloys.

[0050] This application also provides a two-color injection molding apparatus for polyethylene material, including the two-color injection molding mechanism for polyethylene material as described above.

[0051] The principle of the embodiment of the polyethylene material two-color injection molding device provided in this application is as follows: After the first color injection is completed, the second drive source 52 drives the turntable 31 away from the mounting plate 4. The second drive source 52 drives the turntable 31 to rotate 180°. Then, the second drive source 52 drives the turntable 31 to move closer to the mounting plate 4, so that the first positioning member 33 is inserted into the first positioning groove 42 and the second positioning member 34 is inserted into the second positioning groove 43, thereby achieving further positioning of the turntable 31, which helps to ensure rotation accuracy and thus ensure good injection molding effect.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A two-color injection molding mechanism for a polyethylene material, characterized by, The utility model relates to a mould set, which comprises: an upper mould set (1) having a first cavity (11) and a second cavity (12), and a lower mould set (2) having a first core (21) and a second core (22), wherein the first cavity (11) is oppositely arranged and matched with the first core (21), the second cavity (12) is oppositely arranged and matched with the second core (22), and the first core (21) is centrally symmetrical with the second core (22); a rotating assembly (3) and a mounting plate (4), wherein the mounting plate (4) is arranged on a side of the lower mould set (2) away from the upper mould set (1), and the rotating assembly (3) comprises a rotating disc (31) and a positioning member (32), wherein the rotating disc (31) is rotationally connected to the mounting plate (4), and the positioning member (32) is arranged on an outer peripheral wall of the rotating disc (31), and the mounting plate (4) is provided with a positioning groove (41) for embedding the positioning member (32).

2. The bi-color injection molding mechanism of polyethylene material according to claim 1, characterized in that: The positioning member (32) comprises at least one first positioning member (33) and at least one second positioning member (34), wherein the first positioning member (33) and the second positioning member (34) are different in structure, the positioning groove (41) comprises at least two first positioning grooves (42) and at least two second positioning grooves (43), the first positioning grooves (42) are matched with the first positioning members (33), the second positioning grooves (43) are matched with the second positioning members (34), and the first positioning grooves (42) and the second positioning grooves (43) are arranged at intervals along the outer peripheral wall of the rotating disc (31) and have an included angle of 90°.

3. The bi-color injection molding mechanism of polyethylene material according to claim 2, characterized in that: The first positioning member (33) has a polygonal or irregular cross section, and the second positioning member (34) has a polygonal or irregular cross section.

4. The bi-color injection molding mechanism of polyethylene material according to claim 3, characterized in that: A fixing plate (50) is arranged on a side of the mounting plate (4) away from the lower mould set (2), a driving assembly (5) is arranged between the mounting plate (4) and the fixing plate (50), the driving assembly (5) comprises a first driving source (51) and a second driving source (52), the first driving source (51) is mounted on the fixing plate (50), the first driving source (51) is transmissionally connected to the rotating disc (31) through the mounting plate (4) to drive the rotating disc (31) to rotate, and one end of the second driving source (52) is arranged on the mounting plate (4) and the other end is transmissionally connected to the fixing plate (50) to drive the first driving source (51) and the rotating disc (31) to ascend and descend.

5. The mechanism for bi-color injection molding of polyethylene material according to claim 4, characterized in that: The rotating groove (44) is communicated with the first positioning groove (42) and the second positioning groove (43), the depth of the rotating groove (44) is greater than the depth of the first positioning groove (42) and the second positioning groove (43), the rotating groove (44) is used for inserting at least part of the first positioning member (33) and the second positioning member (34), and the first positioning member (33) and the second positioning member (34) can be slidably arranged in the rotating groove (44).

6. The dual color injection molding mechanism of polyethylene material of claim 1, wherein: The upper mold set (1) is provided with a positioning pin (13) on the side facing the lower mold set (2), the lower mold set (2) is provided with a plug-in groove (23) on the side facing the upper mold set (1), the positioning pin (13) is matched with the plug-in groove (23), and the outer diameter of the positioning pin (13) gradually decreases away from the side of the upper mold set (1).

7. The dual color injection molding mechanism of polyethylene material according to claim 6, characterized in that: The plug-in groove (23) is provided with a magnetic member, and the positioning pin (13) is provided with a magnetic metal, and the magnetic member and the magnetic metal are magnetically attracted.

8. The bi-color injection molding mechanism of polyethylene material according to claim 2, characterized in that: The first positioning member (33) and the second positioning member (34) are detachably connected with the rotating disc (31).

9. The dual color injection molding mechanism of polyethylene material according to claim 8, characterized in that: The side wall of the rotating disc (31) is provided with a first mounting groove (35) and a second mounting groove (36), the first positioning member (33) is inserted into the first mounting groove (35), the second positioning member (34) is inserted into the second mounting groove (36), the side wall of the first positioning member (33) is in contact with the inner wall of the first mounting groove (35), the first fastening member (37) is inserted between the first positioning member (33) and the rotating disc (31), the side wall of the second positioning member (34) is in contact with the inner wall of the second mounting groove (36), and the second fastening member (38) is inserted between the second positioning member (34) and the rotating disc (31).

10. A bi-color injection molding apparatus for polyethylene materials, characterized by: The polyethylene material double-color injection molding mechanism comprises the polyethylene material double-color injection molding mechanism as claimed in any one of claims 1-9.

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