A multi-directional core-pulling two-color injection mold

Abstract

The application provides a multi-direction core-pulling double-color injection mold, wherein a one-color station and a two-color station are arranged in a mold body; two lower mold cores of the application can be switched between the one-color station and the two-color station through a core turning mechanism, and can be ejected through an ejection mechanism after completing secondary injection in the two-color station, so as to meet the requirement of forming a double-color plastic product by using double-color materials; on the basis, the lower mold core comprises a lower mold core insert, the four-direction core-pulling mechanism comprises two core-pulling large sliders, two core-pulling small sliders and a spade base assembly, and the core-pulling large sliders can control the core-pulling action of the core-pulling small sliders through the spade base assembly, so that the application can realize four-direction core-pulling by providing power to the core-pulling large sliders only, so that the structure of the whole mold is relatively simple and the volume is relatively small; in addition, the four-direction core-pulling can be carried out synchronously, so that the core-pulling action of the whole mold occupies less time, thereby improving the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of two-color injection mold technology, and specifically to a multi-directional core-pulling two-color injection mold. Background Technology

[0002] Two-color injection molds are a type of injection mold that uses two different colors or materials of plastic to inject them into the same workpiece within one injection cycle through a specific mold structure. The core principle is to use two injection systems in the same mold to inject two different plastics respectively, so that the injection molded product has two colors or different functional material areas. Two-color injection molds are commonly used in automotive interior parts, electronic product casings, home appliance parts and other products that require the combination of two materials or colors.

[0003] As the requirements for plastic products become more stringent, their structures are becoming increasingly complex, often requiring multi-directional core pulling. When a plastic product needs both two-color molding and multi-directional core pulling, two injection molding systems and multiple core pulling systems in different directions coexist, making the structure of the two-color injection mold extremely complex and requiring a large amount of space. Furthermore, producing multi-directional core-pulling two-color plastic products requires two separate injection molding processes and multiple core pulling operations in different directions, resulting in numerous production steps and ultimately lower production efficiency. Summary of the Invention

[0004] The problem this invention aims to solve is to provide a multi-directional core-pulling two-color injection mold with a relatively simple structure, small size, and high production efficiency.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: a multi-directional core-pulling two-color injection mold, including a mold body, wherein the mold body has a one-color station and a two-color station inside; further comprising a core-rotating mechanism disposed between the one-color station and the two-color station, two lower mold cores respectively disposed at the one-color station and the two-color station and respectively connected to both sides of the core-rotating mechanism, two sets of four-directional core-pulling mechanisms respectively disposed at the one-color station and the two-color station, and an ejection mechanism disposed at the two-color station;

[0006] The lower mold core includes a lower mold core insert for molding the lower features of the two-color plastic product; the four-way core-pulling mechanism includes two large core-pulling sliders disposed at the front and rear ends of the lower mold core insert for molding the front and rear features of the two-color plastic product, two small core-pulling sliders disposed on the left and right sides of the lower mold core insert for molding the left and right features of the two-color plastic product, and a shovel base assembly disposed at one end of the large core-pulling slider; the small core-pulling sliders are controlled by the shovel base assembly so that they can complete the four-way core-pulling together with the large core-pulling sliders.

[0007] After the two-color plastic product completes its first injection molding at the one-color station, the four-way core-pulling mechanism at the one-color station pulls the core; the core-rotating mechanism rotates the two lower mold cores to transfer the lower mold cores of the one-color station to the two-color station, where a second injection molding is performed; the two-color plastic product that has completed the second injection molding is ejected by the ejection mechanism.

[0008] Compared with the prior art, the mold body of the present invention has a single-color station and a two-color station. The two lower mold cores of the present invention can switch between the single-color station and the two-color station through a core-rotating mechanism, and after the second injection molding is completed in the two-color station, they are ejected by the ejection mechanism, thereby meeting the requirement of molding two-color plastic products with two-color materials. On this basis, the lower mold core of the present invention includes a lower mold core insert, and the four-way core-pulling mechanism includes two large core-pulling sliders, two small core-pulling sliders, and a shovel base assembly. The large core-pulling sliders can control the core-pulling action of the small core-pulling sliders through the shovel base assembly, so that the present invention only needs to provide power to the large core-pulling sliders to achieve four-way core pulling, thereby making the structure of the entire mold simpler and the volume smaller. In addition, since the four-way core pulling can be carried out simultaneously, the core pulling action of the entire mold takes less time, thereby improving production efficiency.

[0009] The present invention provides a multi-directional core-pulling two-color injection mold, wherein the lower mold core has two cavities arranged left and right; the lower mold core insert is provided in two parts and is respectively disposed in the cavity; the core-pulling large slider includes two slider heads arranged left and right, and the two slider heads correspond to the two cavities respectively; each cavity is provided with two core-pulling small sliders.

[0010] The present invention provides a multi-directional core-pulling two-color injection mold, wherein the lower mold core includes a plurality of small slider guide rails; each cavity is provided with a small slider guide rail on both sides; the core-pulling small slider is configured to slide left and right in the small slider guide rails.

[0011] The present invention provides a multi-directional core-pulling two-color injection mold, wherein the small slider guide rail includes a first guide rail and a second guide rail; the first guide rail is disposed on both sides of the lower mold core, and the second guide rail is disposed between the two cavities; the first guide rail has one core-pulling slider, and the second guide rail has two core-pulling sliders.

[0012] The core-pulling slider has an inclined groove, which includes a first inclined surface and a bottom surface; the core-pulling slider includes an elastic lever disposed on the bottom surface;

[0013] The shovel base assembly moves back and forth in the inclined groove along with the large core-pulling slider. During core pulling, the small core-pulling slider is driven to move left and right by the elastic lever. During reset, the small core-pulling slider is driven to move left and right by the first inclined surface.

[0014] The present invention provides a multi-directional core-pulling two-color injection mold, wherein the shovel base assembly includes a single-sided shovel base and a double-sided shovel base; the single-sided shovel base cooperates with the first guide rail, and the double-sided shovel base cooperates with the second guide rail.

[0015] The present invention provides a multi-directional core-pulling two-color injection mold, wherein the single-sided shovel base includes a single-sided shovel base for one color station and a single-sided shovel base for two color stations, and the double-sided shovel base includes a double-sided shovel base for one color station and a double-sided shovel base for two color stations.

[0016] The single-sided shovel base of the single-color workstation has one clearance groove and one second inclined surface, and the double-sided shovel base of the single-color workstation has two clearance grooves and two second inclined surfaces;

[0017] When the single-color station is pulling out cores, the two large core-pulling sliders drive the single-sided shovel base and the double-sided shovel base of the single-color station to move back and forth, while the two small core-pulling sliders remain stationary; when the single-color station is resetting, the two large core-pulling sliders drive the single-sided shovel base and the double-sided shovel base of the single-color station to move back and forth, while the two small core-pulling sliders reset under the action of the first inclined plane and the second inclined plane.

[0018] The single-sided shovel base of the two-color workstation has one control groove and one third inclined surface, and the double-sided shovel base of the two-color workstation has two control grooves and two third inclined surfaces;

[0019] When the two-color station is pulling the core, the two large core-pulling sliders drive the single-sided shovel base and the double-sided shovel base of the two-color station to move back and forth, and the two small core-pulling sliders move left and right to complete the core pulling; when the two-color station is reset, the two large core-pulling sliders drive the single-sided shovel base and the double-sided shovel base of the two-color station to move back and forth, and the two small core-pulling sliders are reset under the action of the first inclined plane and the third inclined plane.

[0020] The present invention provides a multi-directional core-pulling two-color injection mold, which further includes an upper mold core respectively disposed at the one-color station and the two-color station and respectively connected to the two lower mold cores;

[0021] The mold body includes a lower mold assembly and an upper mold assembly; the lower mold core is disposed in the lower mold assembly, and the upper mold core is disposed in the upper mold assembly.

[0022] The present invention provides a multi-directional core-pulling two-color injection mold, wherein the core-rotating mechanism includes a core-rotating plate fixing seat, a core-rotating guide sleeve, and a core-rotating body arranged sequentially from top to bottom; two lower mold cores are respectively disposed on both sides of the core-rotating plate fixing seat; the core-rotating body lifts the core-rotating plate fixing seat and the two lower mold cores and rotates them 180°, and the core-rotating body then resets to transfer the lower mold core of the one-color station to the two-color station.

[0023] The present invention provides a multi-directional core-pulling two-color injection mold, wherein the ejection mechanism includes a large ejector plate and multiple ejector pins and multiple limiting pins disposed on the large ejector plate;

[0024] The lower mold core further includes a small ejector plate; the small ejector plate includes a small ejector plate body, a small ejector pin disposed in the small ejector plate body, and a locking block disposed on one side of the small ejector plate body;

[0025] The ejector pin column controls the up-and-down movement of the small ejector pin so that the small ejector pin can pass through the lower mold core insert;

[0026] The four-way core-pulling mechanism further includes multiple small ejector plate locking blocks that move back and forth with the large core-pulling slider; the side of each small ejector plate locking block has a locking groove; the locking groove cooperates with the locking block to restrict the small ejector plate.

[0027] The present invention provides a multi-directional core-pulling two-color injection mold, wherein the four-directional core-pulling mechanism further includes a hydraulic cylinder disposed on the lower mold assembly and a transmission rod disposed on the hydraulic cylinder; the transmission rod is connected to the core-pulling large slider to control the forward and backward movement of the core-pulling large slider. Attached Figure Description

[0028] Figure 1 This is a perspective view of a multi-directional core-pulling two-color injection mold according to a preferred embodiment of the present invention;

[0029] Figure 2 This is a perspective view of a multi-directional core-pulling two-color injection mold according to a preferred embodiment of the present invention, after the upper mold assembly is hidden;

[0030] Figure 3 This is a perspective view of the internal structure of a preferred embodiment of the present invention from one side.

[0031] Figure 4 This is a top view of the internal structure according to a preferred embodiment of the present invention;

[0032] Figure 5 This is a perspective view of the internal structure of a preferred embodiment of the present invention from another side.

[0033] Figure 6 This is a three-dimensional schematic diagram of the core-rotating mechanism and two lower mold cores according to a preferred embodiment of the present invention;

[0034] Figure 7 This is an exploded view of a core-pulling slider according to a preferred embodiment of the present invention;

[0035] Figure 8 This is a perspective view of a shovel base assembly according to a preferred embodiment of the present invention;

[0036] Figure 9 This is a cross-sectional schematic diagram showing the location of the small ejector plate locking block according to a preferred embodiment of the present invention;

[0037] Figure 10 This is a cross-sectional schematic diagram showing the location of the shovel base assembly according to a preferred embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the state of the lower mold core transfer station according to a preferred embodiment of the present invention;

[0039] Figure 12 This is a perspective view of a two-color plastic product according to a preferred embodiment of the present invention. Detailed Implementation

[0040] Before detailing any embodiment of the invention, it should be understood that the invention, in its application, is not limited to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention can have other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0041] Furthermore, firstly, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0042] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

[0043] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0044] Please see Figure 1-12 The multi-directional core-pulling two-color injection mold shown includes a mold body 1, which has a single-color station 11 and a two-color station 12 inside; it also includes a core-rotating mechanism 2 disposed between the single-color station 11 and the two-color station 12, two lower mold cores 3 respectively disposed at the single-color station 11 and the two-color station 12 and respectively connected to both sides of the core-rotating mechanism 2, two sets of four-way core-pulling mechanisms 4 respectively disposed at the single-color station 11 and the two-color station 12, and an ejection mechanism 5 disposed at the two-color station 12; the lower mold core 3 includes a lower mold core insert 31 for molding the lower features of the two-color plastic product 6; the four-way core-pulling mechanism 4 includes two... The system comprises a large core-pulling slider 41, two small core-pulling sliders 42 respectively disposed on the left and right sides of the lower mold insert 31 for molding the left and right features of the two-color plastic product 6, and a shovel base assembly 43 disposed at one end of the large core-pulling slider 41; the small core-pulling sliders 42 are controlled by the shovel base assembly 43 so as to complete four-way core pulling together with the large core-pulling slider 41; after the two-color plastic product 6 completes the first injection molding at the single-color station 11, the four-way core-pulling mechanism 4 at the single-color station 11 pulls the core; the core-rotating mechanism 2 rotates the two lower mold inserts 3 to transfer the lower mold inserts 3 of the single-color station 11 to the two-color station 12, where a second injection molding is performed; the two-color plastic product 6, after completing the second injection molding, is ejected by the ejection mechanism 5.

[0045] Please continue reading. Figure 12 The illustration shows a two-color plastic product 6 according to a preferred embodiment of the present invention. The two-color plastic product 6 includes two first core-pulling surfaces 61 at the front and back and two second core-pulling surfaces 62 at the left and right. The two first core-pulling surfaces 61 are formed by two large core-pulling sliders 41 arranged at the front and back, respectively, and the two second core-pulling surfaces 62 are formed by two small core-pulling sliders 42 arranged at the left and right, respectively.

[0046] Based on the aforementioned four-way core-pulling feature of the two-color plastic product 6, in actual use, the mold body 1 of the present invention is provided with a single-color station 11 and a two-color station 12. The two lower mold cores 3 of the present invention can switch between the single-color station 11 and the two-color station 12 through the core-rotating mechanism 2, and after the second injection molding is completed at the two-color station 12, they are ejected by the ejection mechanism 5, thereby meeting the requirement of molding two-color plastic products 6 using two-color materials. On this basis, the lower mold core 3 of the present invention includes a lower mold core insert 31, and the four-way core-pulling mechanism 4 includes two large core-pulling sliders 41, two small core-pulling sliders 42, and a shovel base assembly 43. The large core-pulling sliders 41 can control the core-pulling action of the small core-pulling sliders 42 through the shovel base assembly 43, so that the present invention only needs to provide power to the large core-pulling sliders 41 to achieve four-way core pulling, thereby making the structure of the entire mold relatively simple and the volume small. In addition, since the four-way core pulling can be carried out simultaneously, the core pulling action of the entire mold takes less time, thereby improving production efficiency.

[0047] Please continue reading. Figure 3-6 The lower mold core 3 has two cavities arranged left and right; the lower mold core insert 31 is provided in two parts and is respectively provided in the cavity; the core-pulling large slider 41 includes two slider heads 411 arranged left and right, and the two slider heads 411 correspond to the two cavities respectively; each cavity is provided with two core-pulling small sliders 42.

[0048] Specifically, this embodiment features a design where each lower mold core 3 has two cavities, and each cavity has two slider heads 411 and two core-pulling sliders 42 on its four sides. This design allows a single lower mold core 3 to simultaneously injection mold two two-color plastic products 6. Furthermore, by switching the action of the lower mold core 3 through the core-rotating mechanism 2, it is possible to first complete the one-color molding of two two-color plastic products 6 at the one-color station 11, and then complete the two-color molding of two two-color plastic products 6 at the two-color station 12. This results in higher production efficiency for the entire multi-directional core-pulling two-color injection mold.

[0049] It is understood that in other embodiments, each lower mold core 3 may also be provided with three or more cavities, and each cavity is provided with two slider heads 411 and two core-pulling sliders 42 on its four sides, thereby realizing the processing of three or more two-color plastic products 6 by injection molding a single lower mold core 3 at the same time.

[0050] Please continue reading. Figure 6 , Figure 7 The lower mold core 3 includes a plurality of small slider guide rails 32; each cavity is provided with a small slider guide rail 32 on both sides; the core-pulling slider 42 is configured to slide left and right in the small slider guide rails 32.

[0051] Specifically, multiple small slider guide rails 32 are fixed to the lower mold core 3 by fasteners. Each cavity has a small slider guide rail 32 on both sides, and the core-pulling small slider 42 can slide left and right in the small slider guide rail 32. Under this setting, the core-pulling small slider 42 on both sides has a carrier, and the stable operation of the core-pulling small slider 42 is guaranteed.

[0052] Please continue reading. Figure 6 , Figure 7 The small slider guide rail 32 includes a first guide rail 321 and a second guide rail 322. The first guide rail 321 is disposed on both sides of the lower mold core 3, and the second guide rail 322 is disposed between the two cavities. The first guide rail 321 has one core-pulling slider 42, and the second guide rail 322 has two core-pulling sliders 42. Specifically, since each lower mold core 3 has two cavities in this embodiment, a first guide rail 321 is disposed on each side edge of the lower mold core 3, and a second guide rail 322 is disposed in the middle of the lower mold core 3, i.e., between the two cavities. The structure of the second guide rail 322 is the combination of the structures of the two first guide rails 321, serving its left and right cavities respectively. Under this arrangement, not only is the space between the two cavities that originally required two first guide rails 321 compressed to only one second guide rail 322, thereby reducing the mold volume, but also the complexity of the structure is reduced because the second guide rail 322 is formed by the combination of two first guide rails 321.

[0053] Please continue reading. Figure 6 , Figure 7 The core-pulling slider 42 has a groove 421, which includes a first inclined surface 4211 and a bottom surface 4212. The core-pulling slider 42 includes an elastic lever 422 disposed on the bottom surface 4212. The shovel base assembly 43 moves back and forth in the groove 421 with the core-pulling slider 41. When pulling the core, the core-pulling slider 42 is driven to move left and right by the elastic lever 422. When resetting, the core-pulling slider 42 is driven to move left and right by the first inclined surface 4211. The shovel base assembly 43 enters or exits the groove 421 when moving back and forth with the core-pulling slider 41. When the base component 43 exits the inclined groove 421, the action of the base component 43 and the elastic lever 422 forces the small core-pulling slider 42 to move towards the outside of the cavity, thereby completing the four-way core pulling synchronously with the large core-pulling slider 41. When the base component 43 enters the inclined groove 421, the action of the base component 43 and the first inclined surface 4211 forces the inside of the cavity to move, thereby completing the four-way reset synchronously with the large core-pulling slider 41. Since the core pulling and reset in the four directions of the cavity can be synchronized, and the four cavities of the two lower mold cores 3 in the whole mold can be synchronized, the production efficiency of the whole mold is greatly improved.

[0054] Please continue reading. Figure 4 , Figure 8 , Figure 10 The present invention provides a multi-directional core-pulling two-color injection mold, wherein the shovel base assembly 43 includes a single-sided shovel base 431 and a double-sided shovel base 432; the single-sided shovel base 431 cooperates with the first guide rail 321, and the double-sided shovel base 432 cooperates with the second guide rail 322.

[0055] Specifically, in this embodiment, each lower mold core 3 is provided with two cavities, and each lower mold core 3 is provided with a first guide rail 321 on both sides and a second guide rail 322 in the middle. Therefore, the shovel base assembly 43 is configured as a single-sided shovel base 431 and a double-sided shovel base 432. The two single-sided shovel bases 431 are set on both sides of the core-pulling large slider 41 and cooperate with the two first guide rails 321 on both sides of the lower mold core 3 respectively. The double-sided shovel base 432 is set in the middle of the core-pulling large slider 41 and cooperates with the second guide rails 322 on both sides of the lower mold core 3. It can be understood that since there is only one core-pulling small slider 42 in the first guide rail 321, the single-sided shovel base 431 is provided with only one set of structure that cooperates with the core-pulling small slider 42. Since there are two core-pulling small sliders 42 in the second guide rail 322, the double-sided shovel base 432 is provided with two sets of structure that cooperate with the two core-pulling small sliders 42 respectively.

[0056] Please continue reading. Figure 4 , Figure 8 , Figure 10 The single-sided shovel base 431 includes a single-sided shovel base 431a for a single-color workstation and a single-sided shovel base 431b for a two-color workstation, and the double-sided shovel base 432 includes a double-sided shovel base 432a for a single-color workstation and a double-sided shovel base 432b for a two-color workstation.

[0057] The single-sided shovel base 431a of the single-color workstation has a clearance groove and a second inclined surface, and the double-sided shovel base 432a of the single-color workstation has two clearance grooves and two second inclined surfaces.

[0058] When the single-color station 11 is pulling out cores, the two large core-pulling sliders 41 drive the single-sided shovel base 431a and the double-sided shovel base 432a of the single-color station to move back and forth, while the two small core-pulling sliders 42 remain stationary; when the single-color station 11 is resetting, the two large core-pulling sliders 41 drive the single-sided shovel base 431a and the double-sided shovel base 432a of the single-color station to move back and forth, while the two small core-pulling sliders 42 reset under the action of the first inclined surface 4211 and the second inclined surface.

[0059] The single-sided shovel base 431b of the two-color station has a control groove and a third inclined surface, and the double-sided shovel base 432b of the two-color station has two control grooves and two third inclined surfaces;

[0060] When the two-color station 12 is pulling the core, the two large core-pulling sliders 41 drive the single-sided shovel base 431b and the double-sided shovel base 432b of the two-color station to move back and forth, and the two small core-pulling sliders 42 move left and right to complete the core pulling; when the two-color station 12 is reset, the two large core-pulling sliders 41 drive the single-sided shovel base 431b and the double-sided shovel base 432b of the two-color station to move back and forth, and the two small core-pulling sliders 42 are reset under the action of the first inclined surface 4211 and the third inclined surface;

[0061] The core-pulling slider 42 also includes a primary side forming block 423 and a secondary side forming block 424 disposed on the side facing the cavity.

[0062] It is understandable that the two-color plastic product 6 undergoes a first injection molding process at the one-color station 11 to form a semi-finished product, and then undergoes a second injection molding process at the two-color station 12, around the semi-finished product, to form the finished product. Since the slider head 411 of the large core-pulling slider 41 relates to the shape characteristics of the two-color plastic product 6, the slider head 411 at the one-color station 11 matches the characteristics of the semi-finished product formed by the first injection molding, and the slider head 411 at the two-color station 12 matches the characteristics of the finished product formed by the second injection molding. The slider heads 411 at the two stations must be designed differently. The small core-pulling slider 42, which includes a primary side molding block 423 and a secondary side molding block 424, can be formed using the primary side molding block 423 during the first injection molding of the semi-finished product, and using the secondary side molding block 424 during the second injection molding of the finished product. Figure 11 As shown in the enlarged view in the upper left corner, under this setting, after the core-pulling slider 42 completes the first injection molding to form a semi-finished product at the one-color station 11, it is not necessary to pull the core again. Instead, it can directly transfer to the two-color station 12 through the core-turning mechanism 2 for the second injection molding, thus making the structure of the one-color station 11 simpler.

[0063] Furthermore, since the structure of the entire lower mold core 3 is completely identical and can be used in both the one-color station 11 and the two-color station 12 via the core-turning mechanism 2, and the core-pulling slider 42 does not need to pull the core in the one-color station 11 but must pull the core in the two-color station 12, in order to achieve the aforementioned functions, the single-sided shovel base 431 is designed to include the one-color station single-sided shovel base 431a and the two-color station single-sided shovel base 431b, and the double-sided shovel base 432 is designed to include the one-color station double-sided shovel base 432a and the two-color station double-sided shovel base 432b;

[0064] Please continue reading. Figure 10The enlarged view in the upper right corner shows that the single-sided shovel base 431a of the single-color station has a relief groove and a second inclined surface, and the double-sided shovel base 432a of the single-color station has two relief grooves and two second inclined surfaces. The relief groove is used to avoid the elastic lever 422 of the core-pulling slider 42 in the single-color station 11, so that the core-pulling slider 42 in the single-color station 11 will not be pulled out along with the core-pulling slider 41. The second inclined surface is used to press and cooperate with the first inclined surface 4211, so that the core-pulling slider 42 that has been pulled out after rotating back from the two-color station 12 is reset, and the core-pulling slider 42 is locked during the injection molding process.

[0065] Please continue reading. Figure 10 The enlarged view in the upper left corner shows that the single-sided shovel base 431b of the two-color station 12 has a control groove and a third inclined surface, and the double-sided shovel base 432b of the two-color station has two control grooves and two third inclined surfaces. The function of the control groove is to interact with the elastic lever 422 of the core-pulling slider 42 in the two-color station 12, so that the core-pulling slider 42 in the two-color station 12 is pulled out along with the core-pulling slider 41. The function of the third inclined surface is to press and cooperate with the first inclined surface 4211, so that the core-pulling slider 42 is locked during the injection molding process.

[0066] It is worth mentioning that further reading is required. Figure 7 , Figure 10 The elastic lever 422 has an elastic element at its lower end, allowing it to move up and down on the bottom surface 4212. The elastic lever 422 includes a semi-locking block positioned above the bottom surface 4212. During core extraction, the semi-locking block must engage with the control groove of the aforementioned single-sided shovel base 431b or double-sided shovel base 432b in the two-color workstation to generate interaction. During reset, the single-sided shovel base 431b or double-sided shovel base 432b in the two-color workstation presses against the semi-locking block, causing the semi-locking block to... The block is pressed into the bottom surface 4212 under the action of the elastic element. After the single-sided shovel base 431b or the double-sided shovel base 432b of the two-color station is fully reset, the half-block bounces up again under the action of the elastic element and enters the control groove for the next core pulling. In order to facilitate the compression of the half-block by the single-sided shovel base 431b or the double-sided shovel base 432b of the two-color station, the compression surfaces of the single-sided shovel base 431b or the double-sided shovel base 432b of the two-color station and the half-block are both set as inclined surfaces.

[0067] Please continue reading. Figure 2This includes upper mold cores 7, which are respectively located at the single-color station 11 and the two-color station 12 and respectively connected to the two lower mold cores 3. It can be understood that the cavity is composed of the lower mold cores 3 and the upper mold cores 7. Since the structure of the entire lower mold core 3 is completely identical and can be used in both the single-color station 11 and the two-color station 12 through the core-rotating mechanism 2, the structures of the two upper mold cores 7 can be divided into two cases. When the shape of the semi-finished product formed by the first injection molding of the single-color station 11 and the finished product formed by the second injection molding of the two-color station 12 can be determined by the four-way core-pulling mechanism 4, the upper mold cores 7 of the single-color station 11 and the two-color station 12 can have the same structure. When the shape of the semi-finished product formed by the first injection molding of the single-color station 11 and the finished product formed by the second injection molding of the two-color station 12 needs to be determined by the upper mold cores 7 and the four-way core-pulling mechanism 4, the structures of the upper mold cores 7 of the single-color station 11 and the two-color station 12 are different.

[0068] Please continue reading. Figure 1 , Figure 2 The mold body 1 includes a lower mold assembly 13 and an upper mold assembly 14; the lower mold core 3 is disposed on the lower mold assembly 13, and the upper mold core 7 is disposed on the upper mold assembly 14; it can be understood that the lower mold assembly 13 is used to provide a carrier for the core-rotating mechanism 2, the lower mold core 3 and the four-way core-pulling mechanism 4; the upper mold assembly 14 is used to provide a carrier for the upper mold core 7, and when the upper mold assembly 14 opens the mold, it will carry the upper mold core 7 to move together.

[0069] Please continue reading. Figure 3 , Figure 6 , Figure 10 The core-rotating mechanism 2 includes a core-rotating plate fixing seat 21, a core-rotating guide sleeve 22, and a core-rotating body 23 arranged sequentially from top to bottom; the two lower mold cores 3 are respectively arranged on both sides of the core-rotating plate fixing seat 21; the core-rotating body 23 lifts the core-rotating plate fixing seat 21 and the two lower mold cores 3 and rotates them 180°, and the core-rotating body 23 then resets to transfer the lower mold core 3 of the single-color station 11 to the two-color station 12.

[0070] Specifically, a power mechanism is externally connected to the lower part of the rotating core body 23. This power mechanism is used to realize the lifting and rotation of the rotating core body 23; for example... Figure 11 As shown, when the lower mold core 3 needs to switch positions, the rotating core body 23 drives the two lower mold cores 3 to lift first, then rotate 180°, and then reset, thereby realizing the switching of the lower mold core 3 positions.

[0071] Please continue reading. Figure 5 , Figure 7 , Figure 10The ejection mechanism 5 includes a large ejector plate 51 and multiple ejector pins 52 and multiple limiting pins 53 disposed on the large ejector plate 51. It can be understood that the two-color plastic product 6 is first injection molded at the one-color station 11 to form a semi-finished product, and then injection molded at the two-color station 12 and around the semi-finished product to form a finished product. Therefore, the ejection mechanism 5 is only set below the two-color station 12. The large ejector plate 51 is connected to a power mechanism. Under the action of the power mechanism, the large ejector plate 51 drives the multiple ejector pins 52 to move up and down. The function of the multiple limiting pins 53 is to cooperate with the lower end face of the lower mold core 3 to prevent the large ejector plate 51 from moving excessively.

[0072] The lower mold core 3 further includes a small ejector plate 33; the small ejector plate 33 includes a small ejector plate body 331, a small ejector pin 332 disposed within the small ejector plate body 331, and a locking block 333 disposed on one side of the small ejector plate body 331; the ejector pin column 52 controls the small ejector pin 332 to move up and down, so that the small ejector pin 332 can pass through the lower mold core insert 31; specifically, since the two-color plastic product 6 is small in size, directly using multiple large ejector pin columns 52 to eject it would result in a large space occupation and no place to set the molding structure of the two-color plastic product 6. Therefore, the lower mold core 3 further includes a small ejector plate 33, which includes a small ejector plate body 331 and a small ejector pin 332. The ejector pin column 52 drives the small ejector plate 33, which in turn drives the small ejector pin 332 to eject the two-color plastic product 6 from the lower mold core insert 31;

[0073] The four-way core-pulling mechanism 4 further includes multiple small ejector plate locking blocks 44 that move back and forth with the large core-pulling slider 41; the side of the small ejector plate locking block 44 has a locking groove 441; the locking groove 441 cooperates with the locking block 333 to restrict the small ejector plate 33.

[0074] It is understandable that the injection pressure of molten plastic material is relatively high during injection molding. Therefore, each moving part in the cavity must be equipped with a locking mechanism to resist the injection pressure of the material and prevent displacement of the moving parts during the material injection process. In this embodiment, the large core-pulling slider 41 after mold closing can be locked by the lower mold assembly 13, the upper mold assembly 14, and the hydraulic cylinder 45. The small core-pulling slider 42 after mold closing can be locked by inserting the shovel base assembly 43 into the inclined groove 421. However, the small ejector pin 332 in the lower mold insert 31 is still in a free state and may still shift when facing the injection of material. Therefore, the small ejector plate 33 includes a locking block 333, and the four-way core-pulling mechanism 4 includes a small ejector plate locking block 44. The side of the small ejector plate locking block 44 has a locking groove 441. Please refer to [link to relevant documentation]. Figure 9 When the mold is closed, the locking block 333 is inserted into the locking groove 441 to lock the small ejector plate 33, so as to prevent the small ejector 332 from shifting when the raw material is injected.

[0075] It is worth mentioning that you should refer to Figure 9 The small ejector plate locking block 44 is set on the core-pulling large slider 41 and moves back and forth synchronously with the core-pulling large slider 41. Therefore, the locking action of the small ejector plate locking block 44 on the small ejector plate 33 is completely powered by the core-pulling large slider 41 and realized synchronously. Thus, no additional power source is required, which makes the overall structure of the mold simple and occupies less space. The locking of the core-pulling large slider 41, the locking of the core-pulling small slider 42, and the locking of the small ejector plate 33 are carried out synchronously, and no additional locking steps are required, which makes the production efficiency high.

[0076] Please continue reading Figure 9 ,At once Figure 9 From the perspective shown, the locking groove 441 includes a wide groove on the left and a narrow groove on the right. When the large sliding block 41 is reset, the locking block 333 first enters the wide groove and then enters the narrow groove, thereby avoiding the risk of the locking block 333 colliding with the small ejector plate locking block 44 when the small ejector plate 33 resets slowly.

[0077] Please continue reading. Figure 3 , Figure 4 The four-way core-pulling mechanism 4 further includes a hydraulic cylinder 45 disposed on the lower mold assembly 13 and a transmission rod 46 disposed on the hydraulic cylinder 45; the transmission rod 46 is connected to the core-pulling slider 41 so as to control the forward and backward movement of the core-pulling slider 41.

[0078] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A multi-directional core-pulling two-color injection mold, characterized in that: The mold body (1) includes a single-color station (11) and a two-color station (12) inside the mold body (1); it also includes a core-rotating mechanism (2) disposed between the single-color station (11) and the two-color station (12), two lower mold cores (3) disposed on the single-color station (11) and the two-color station (12) and respectively connected to both sides of the core-rotating mechanism (2), two sets of four-way core-pulling mechanisms (4) disposed on the single-color station (11) and the two-color station (12) respectively, and an ejection mechanism (5) disposed on the two-color station (12); The lower mold core (3) includes a lower mold core insert (31) for molding the lower features of the two-color plastic product; the four-way core pulling mechanism (4) includes two large core pulling sliders (41) disposed at the front and rear ends of the lower mold core insert (31) for molding the front and rear features of the two-color plastic product, two small core pulling sliders (42) disposed on the left and right sides of the lower mold core insert (31) for molding the left and right features of the two-color plastic product, and a shovel base assembly (43) disposed at one end of the large core pulling slider (41); the small core pulling sliders (42) are controlled by the shovel base assembly (43) so as to complete the four-way core pulling together with the large core pulling sliders (41); The core-pulling slider (42) has a groove (421), the groove (421) includes a first inclined surface (4211) and a bottom surface (4212); the core-pulling slider (42) includes an elastic lever (422) disposed on the bottom surface (4212). The shovel base assembly (43) moves back and forth in the inclined groove (421) along with the core-pulling large slider (41). When pulling the core, the core-pulling small slider (42) is driven to move left and right by the elastic paddle (422). When resetting, the core-pulling small slider (42) is driven to move left and right by the first inclined surface (4211). After the two-color plastic product completes its first injection molding at the single-color station (11), the four-way core-pulling mechanism (4) located at the single-color station (11) pulls the core; the core-rotating mechanism (2) rotates with the two lower mold cores (3) to transfer the lower mold cores (3) of the single-color station (11) to the two-color station (12) and performs a second injection molding at the two-color station (12); the two-color plastic product that has completed the second injection molding is ejected by the ejection mechanism (5).

2. The multi-directional core-pulling two-color injection mold according to claim 1, characterized in that: The lower mold core (3) has two cavities arranged in a left-right configuration; the lower mold core insert (31) is provided in two parts and is respectively provided in the cavity; the core-pulling large slider (41) includes two slider heads (411) arranged in a left-right configuration and the two slider heads (411) correspond to the two cavities respectively; each cavity is provided with two core-pulling small sliders (42).

3. The multi-directional core-pulling two-color injection mold according to claim 2, characterized in that: The lower mold core (3) includes multiple small slider guide rails (32); each cavity has a small slider guide rail (32) on both sides; the core-pulling slider (42) is configured to slide left and right in the small slider guide rail (32).

4. The multi-directional core-pulling two-color injection mold according to claim 3, characterized in that: The small slider guide rail (32) includes a first guide rail (321) and a second guide rail (322); the first guide rail (321) is disposed on both sides of the lower mold core (3), and the second guide rail (322) is disposed between the two cavities; the first guide rail (321) has one core-pulling slider (42), and the second guide rail (322) has two core-pulling sliders (42).

5. The multi-directional core-pulling two-color injection mold according to claim 4, characterized in that: The shovel base assembly (43) includes a single-sided shovel base (431) and a double-sided shovel base (432); the single-sided shovel base (431) cooperates with the first guide rail (321), and the double-sided shovel base (432) cooperates with the second guide rail (322).

6. The multi-directional core-pulling two-color injection mold according to claim 5, characterized in that: The single-sided shovel base (431) includes a single-color station single-sided shovel base (431a) and a two-color station single-sided shovel base (431b), and the double-sided shovel base (432) includes a single-color station double-sided shovel base (432a) and a two-color station double-sided shovel base (432b). The single-sided shovel base (431a) of the single-color workstation has a clearance groove and a second inclined surface, and the double-sided shovel base (432a) of the single-color workstation has two clearance grooves and two second inclined surfaces; When the single-color station (11) pulls the core, the two large core-pulling sliders (41) drive the single-sided shovel base (431a) and the double-sided shovel base (432a) of the single-color station to move back and forth, while the two small core-pulling sliders (42) remain stationary; when the single-color station (11) is reset, the two large core-pulling sliders (41) drive the single-sided shovel base (431a) and the double-sided shovel base (432a) of the single-color station to move back and forth, while the two small core-pulling sliders (42) are reset under the action of the first inclined surface (4211) and the second inclined surface; The single-sided shovel base (431b) of the two-color station has a control groove and a third inclined surface, and the double-sided shovel base (432b) of the two-color station has two control grooves and two third inclined surfaces; When the two-color station (12) is pulling the core, the two large core-pulling sliders (41) drive the single-sided shovel base (431b) and the double-sided shovel base (432b) of the two-color station to move back and forth, and the two small core-pulling sliders (42) move left and right to complete the core pulling; when the two-color station (12) is reset, the two large core-pulling sliders (41) drive the single-sided shovel base (431b) and the double-sided shovel base (432b) of the two-color station to move back and forth, and the two small core-pulling sliders (42) are reset under the action of the first inclined surface (4211) and the third inclined surface.

7. The multi-directional core-pulling two-color injection mold according to claim 1, characterized in that: It also includes upper mold cores (7) which are respectively set at the single-color station (11) and the two-color station (12) and respectively connected to the two lower mold cores (3). The mold body (1) includes a lower mold assembly (13) and an upper mold assembly (14); the lower mold core (3) is disposed on the lower mold assembly (13), and the upper mold core (7) is disposed on the upper mold assembly (14).

8. The multi-directional core-pulling two-color injection mold according to claim 1, characterized in that: The core-rotating mechanism (2) includes a core-rotating plate fixing seat (21), a core-rotating guide sleeve (22), and a core-rotating body (23) arranged sequentially from top to bottom; the two lower mold cores (3) are respectively arranged on both sides of the core-rotating plate fixing seat (21); the core-rotating body (23) lifts up the core-rotating plate fixing seat (21) and the two lower mold cores (3) and rotates them 180°, and the core-rotating body (23) is then reset so that the lower mold core (3) of the single-color station (11) is transferred to the two-color station (12).

9. The multi-directional core-pulling two-color injection mold according to claim 1, characterized in that: The ejection mechanism (5) includes a large ejector plate (51) and multiple ejector pins (52) and multiple limiting pins (53) disposed on the large ejector plate (51). The lower mold core (3) further includes a small ejector plate (33); the small ejector plate (33) includes a small ejector plate body (331), a small ejector (332) disposed in the small ejector plate body (331), and a locking block (333) disposed on one side of the small ejector plate body (331). The ejector pin (52) controls the small ejector pin (332) to move up and down, so that the small ejector pin (332) can pass through the lower mold insert (31); The four-way core-pulling mechanism (4) further includes multiple small ejector plate locking blocks (44) that move back and forth with the large core-pulling slider (41); the side of the small ejector plate locking block (44) has a locking groove (441); the locking groove (441) cooperates with the locking block (333) to restrict the small ejector plate (33).

10. The multi-directional core-pulling two-color injection mold according to claim 7, characterized in that: The four-way core-pulling mechanism (4) further includes a cylinder (45) disposed on the lower mold assembly (13) and a transmission rod (46) disposed on the cylinder (45); the transmission rod (46) is connected to the core-pulling slider (41) so as to control the forward and backward movement of the core-pulling slider (41).

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