In-mold rotating double-color injection molding structure

Abstract

The utility model relates to an in-mold rotating double-color injection molding structure which comprises a lower mold frame, a lower mold core arranged at the upper end of the lower mold frame and a lower fixing plate installed at the bottom of the lower mold frame, a rotating shaft penetrating through the lower mold frame and the lower fixing plate is arranged in the middle of the lower end of the lower mold core, and a gear is sleeved on the rotating shaft. One end of the rotating shaft is connected with a driving device on the injection molding machine table, the driving device controls the rotating shaft to eject the lower mold core out of the lower mold frame or retract the lower mold core into the lower mold frame, and a power mechanism which is meshed with the gear and drives the rotating shaft to rotate is installed between the lower fixing plate and the lower mold frame. A plurality of forming cavities are uniformly arranged on the lower mold core, and each forming cavity consists of a first-color cavity and a second-color cavity. The in-mold rotary double-color injection molding machine is effectively beneficial to an existing site, the double-color injection molding production cost is reduced by 35%, and the in-mold rotary double-color injection molding scheme can be matched with a common machine table for use, so that the purpose of lean production is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of double-color injection molds, in particular to an in-mold rotating double-color injection structure. Background Art

[0002] As the automotive industry develops in a short, flat and fast pace, lean production of products, simplification / merger / deletion / reorganization are the current mainstream. At present, most two-color molds require two sets of molds. Due to the large-scale production of two-color products, there are not enough two-color injection molding machines. A large number of two-color machines need to be purchased to accept orders. The ordering cycle of two-color machines takes about half a year, while there are many single-color machines that are idle. Therefore, it is necessary to develop a two-color mold solution for single-color machines.

[0003] Now there is a rotary switching two-color injection mold, the publication number is CN113858542B, the mold includes: an upper mold, the upper mold is provided with a first nozzle and a second nozzle for injecting injection molding materials; a lower mold matched with the upper mold, the lower mold is rotatably equipped with an assembly base plate; two groups of injection molding modules symmetrically arranged in the lower mold and connected to the assembly base plate; a first slider mechanism; a second slider mechanism; and a switching mechanism for driving the injection molding module to rotate. During the injection molding process, the first nozzle and the second nozzle are injected synchronously, because the first molding cavity on the side of the first nozzle is sealed and isolated from the second molding cavity; therefore, the injection molding materials injected by the first nozzle will not enter the second molding cavity, and because the first molding cavity on the side of the second nozzle is connected to the second molding cavity, the second nozzle can be connected with the product injected in the first molding cavity during injection, so as to realize the injection molding of two-color products. It needs to be used in conjunction with elastic support parts, assembly base plates and other structures. The overall structure is complex, and the use of a single rack drive can easily cause force imbalance and rack breakage. In addition, the side-sealed water channel structure may cause water leakage if the movement time is too long. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an in-mold rotary two-color injection molding structure, which effectively benefits the existing site and reduces the production cost of two-color injection molding by 35%. The in-mold rotary two-color injection molding solution can be used in conjunction with an ordinary machine. Through the internal rotary two-color injection molding of the mold, the production energy consumption of small and medium-sized two-color molds for B-pillar plate products is solved by 50%, thereby achieving the purpose of lean production.

[0005] The technical solution adopted by the present utility model to solve its technical problems is: to provide an in-mold rotary two-color injection molding structure, including a lower mold frame, a lower mold core arranged at the upper end of the lower mold frame, and a lower fixed plate installed at the bottom of the lower mold frame. A rotary shaft penetrating the lower mold frame and the lower fixed plate is provided in the middle of the lower end of the lower mold core. A gear is sleeved on the rotary shaft. One end of the rotary shaft is connected to a driving device on the injection molding machine table. The driving device controls the rotary shaft to eject the lower mold core out of the lower mold frame or retract the lower mold core into the lower mold frame. A power mechanism meshing with the gear and driving the rotary shaft to rotate is installed between the lower fixed plate and the lower mold frame. A plurality of molding chambers are evenly arranged on the lower mold core, and each molding chamber is composed of a first-color cavity and a second-color cavity.

[0006] As a supplement to the technical solution of the present utility model, the power mechanism includes a power oil cylinder fixed to the outside of the lower mold frame and a driving rack fixed to the piston rod of the power oil cylinder. The driving rack meshes with the gear.

[0007] As a supplement to the technical solution of the present utility model, an auxiliary rack that slides back and forth is installed between the lower mold frame and the lower fixed plate. The auxiliary rack is arranged parallel to the driving rack and is located on both sides of the gear respectively.

[0008] As a supplement to the technical solution of the present utility model, a long strip-shaped limiting groove is opened along the length direction on one side of the auxiliary rack, and a limiting block inserted into the limiting groove is fixedly installed at the lower end of the lower mold frame.

[0009] As a supplement to the technical solution of the present utility model, the piston rod of the power oil cylinder is connected with a T-shaped block, and a clamping groove matched with the T-shaped block is opened at one end of the driving rack.

[0010] As a supplement to the technical solution of the present utility model, wear-resistant blocks are embedded and installed on the lower fixed plate, and the wear-resistant blocks are attached to the driving rack.

[0011] As a supplement to the technical solution of the present utility model, force-bearing bearings matched with the rotary shaft are provided inside both the lower mold frame and the lower fixed plate.

[0012] As a supplement to the technical solution of the present utility model, the rotary shaft adopts a tapered roller bearing.

[0013] As a supplement to the technical solution of the present utility model, cooling pipelines are arranged corresponding to each molding chamber inside the lower mold core. A plurality of water channel structures are arranged around the circumference on the end face of the rotary shaft. The water channel structures are arranged along the axial direction of the rotary shaft. One end of each water channel structure is connected with a water pipe, and the other end of each water channel structure is communicated with the corresponding cooling pipeline respectively.

[0014] As a supplement to the technical solution of the present utility model, long strip-shaped key grooves are axially formed on both sides of the rotating shaft, the upper ends of the key grooves penetrate the upper end surface of the rotating shaft, and protrusions cooperating with the key grooves are provided on the inner wall of the gear.

[0015] Beneficial effects: The present utility model relates to an in-mold rotating two-color injection molding structure, which can achieve two-color molding, save 50% of the mold development cost, reduce the injection machine platform rate by 50%, achieve the reduction of the project development cost, improve the production efficiency, realize that the product development does not need to invest in an injection machine platform, and the ordinary machine platform can also achieve two-color injection molding, and the machine platform has a dual-function guarantee; the auxiliary rack and the driving rack are arranged in parallel and are respectively located on both sides of the gear, and a bilateral rack structure in which the auxiliary rack and the driving rack cooperate together is adopted to ensure the balance of the force and rotation of the gear and prevent the rack from breaking; the traditional one adopts a side-sealed waterway structure, and it is easy to leak water when the movement time is too long. However, the in-mold rotating structure of this mold cancels the side sealing ring design and arranges the waterway structure on the end surface of the rotating shaft, solving the problem of water leakage. Description of the Drawings

[0016] Figure 1 is a sectional view of the present utility model;

[0017] Figure 2 is a structural schematic diagram of the present utility model;

[0018] Figure 3 is a structural schematic diagram of the present utility model after removing the lower fixed plate;

[0019] Figure 4 is a structural schematic diagram of the lower fixed plate of the present utility model;

[0020] Figure 5 is a structural schematic diagram of the rotating shaft of the present utility model;

[0021] Figure 6 is a structural schematic diagram of the gear of the present utility model.

[0022] Illustration: 100, lower die core; 200, lower die frame; 300, lower fixed plate; 400, rotating shaft; 500, gear; 600, force-bearing bearing; 101, first-color cavity; 102, second-color cavity; 201, power oil cylinder; 202, driving rack; 203, auxiliary rack; 204, limiting groove; 205, limiting block; 206, T-shaped block; 301, wear-resistant block; 401, waterway structure; 402, key groove; 403, insertion column; 501, protrusion. Detailed Implementation Manner

[0023] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0024] The embodiment of the present invention relates to an in-mold rotating two-color injection molding structure. As Figures 1-6 shown, it includes a lower mold frame 200, a lower mold core 100 arranged at the upper end of the lower mold frame 200, and a lower fixed plate 300 installed at the bottom of the lower mold frame 200. A rotating shaft 400 passing through the lower mold frame 200 and the lower fixed plate 300 is provided in the middle of the lower end of the lower mold core 100. A gear 500 is sleeved on the rotating shaft 400. One end of the rotating shaft 400 is connected to a driving device on the injection molding machine table. The driving device controls the rotating shaft 400 to push the lower mold core 100 out of the lower mold frame 200 or retract the lower mold core 100 into the lower mold frame 200. The driving device is a top pump or a large oil cylinder. A power mechanism that meshes with the gear 500 and drives the rotating shaft 400 to rotate is installed between the lower fixed plate 300 and the lower mold frame 200. A plurality of molding cavities are evenly arranged on the lower mold core 100, and each molding cavity is composed of a first-color cavity 101 and a second-color cavity 102.

[0025] Specifically, the power mechanism includes a power oil cylinder 201 fixed to the outside of the lower mold frame 200 and a driving rack 202 fixed to the piston rod of the power oil cylinder 201. The driving rack 202 meshes with the gear 500. The piston rod of the power oil cylinder 201 is threadedly connected with a T-shaped block 206. The quick connection between the power oil cylinder 201 and the driving rack 202 is realized through the cooperation between the T-shaped block 206 and the card slot at one end of the driving rack 202.

[0026] The complete operation of in-mold rotational two-color molding is as follows: Inside the upper mold of the injection mold, there are a first nozzle and a second nozzle for injecting raw materials. When injecting, first, the first nozzle injects the raw material of the first color into the first-color cavity 101. After the injection molding of the first color is completed, the upper mold and the lower mold are opened. The driving device on the injection molding machine table controls the rotating shaft 400 to push the lower mold core 100 out of the lower mold frame 200. Then, the power cylinder 201 controls the movement of the driving rack 202. The driving rack 202 cooperates with the gear 500 to rotate the rotating shaft 400 and the lower mold core 100 by 180 degrees, replacing the traditional method of rotating the entire mold through the rotating disk on the injection molding machine table. At the same time, after the lower mold core 100 rotates 180 degrees, the second nozzle is aligned with the second-color cavity 102. The driving device on the injection molding machine table controls the rotating shaft 400 to retract the lower mold core 100 into the lower mold frame 200. The second nozzle injects the raw material of the second color into the second-color cavity 102. After the injection molding of the second color is completed, the product is taken out.

[0027] In this embodiment, an auxiliary rack 203 that slides back and forth is further installed between the lower mold frame 200 and the lower fixed plate 300. The auxiliary rack 203 is arranged in parallel with the driving rack 202 and is located on both sides of the gear 500 respectively. A bilateral rack structure that cooperates with the auxiliary rack 203 and the driving rack 202 together is adopted to ensure the balanced force on the gear 500 and the rotating shaft 400 and prevent the rack from breaking.

[0028] Furthermore, a long strip-shaped limiting groove 204 is opened along the length direction on one side of the auxiliary rack 203. The limiting block 205 fixedly installed at the lower end of the lower mold frame 200 cooperates with the limiting groove 204 to limit the range of the back-and-forth sliding of the auxiliary rack 203.

[0029] In this embodiment, a wear-resistant block 301 is embedded and installed on the lower fixed plate 300. The wear-resistant block 301 is fixed to the lower fixed plate 300 by fasteners. The fasteners are bolts or screws. The wear-resistant block 301 can be a whole piece or composed of multiple pieces spliced together. By highly fitting the wear-resistant block 301 with the driving rack 202, during the back-and-forth movement of the driving rack 202, the crosstalk gap of the driving rack 202 can be effectively reduced, ensuring the stable operation of the driving rack 202. Setting the wear-resistant block 301 can also prevent the lower fixed plate 300 from directly rubbing against the driving rack 202 and improve the service life of the lower fixed plate 300.

[0030] Furthermore, the weight of the lower mold core 100 is approximately 335 KG. Compared with the in-mold rotation structures in the industry in the past, the weight of its mold core (i.e., the lower mold core) is less than 100 KG, which has higher requirements for load and structural operation. Bearing holes are provided inside both the lower mold frame 200 and the lower fixing plate 300, and a stress-bearing bearing 600 that cooperates with the rotating shaft 400 is installed in each bearing hole. The stress-bearing bearing 600 used is a tapered roller bearing. The bearing holes, the rotating shaft 400, and the lower mold core 100 need to be machined strictly with the same intermediate reference hole for centering, and the tolerance between the shaft and the hole is controlled within 0.04 mm.

[0031] In this embodiment, independent cooling pipelines are provided inside the lower mold core 100 corresponding to each forming cavity. Since the lower mold core 100 rotates, the waterway structure 401 is designed to enter and exit the waterway only from the middle rotating shaft 400. A plurality of waterway structures 401 are arranged around the circumference on the end face of the rotating shaft 400, and the waterway structure 401 is arranged axially along the rotating shaft 400. Traditionally, a side-sealed waterway structure is used, and it is easy to leak water after a long movement time. The in-mold rotation solution of the present utility model cancels the side sealing ring design and arranges the waterway structure 401 on the end face of the rotating shaft 400, solving the water leakage problem. One end of each waterway structure 401 is connected to a water pipe, and the water pipes are all integrated on a water collecting plate for easy installation of the pipelines. The water pipes and the water collecting plate are connected by a rotary joint, enabling relative rotation between the two. The water collecting plate can be fixed outside the lower mold frame 200, and the other end of each waterway structure 401 is respectively communicated with the corresponding cooling pipeline.

[0032] Furthermore, long strip-shaped key grooves 402 are axially opened on both sides of the rotating shaft 400. The upper end of the key groove 402 penetrates the upper end face of the rotating shaft 400. Through the cooperation between the protrusion 501 on the inner wall of the gear 500 and the key groove 402, the gear 500 can axially slide relative to the rotating shaft 400, and at the same time, the gear 500 can drive the rotating shaft 400 to rotate together. A plug-in column 403 is provided in the middle of the upper end of the rotating shaft 400, and the plug-in column 403 is inserted into the lower part of the lower mold core 100 and fixedly connected by a fastener.

[0033] The present utility model relates to the development technology of small and medium-sized two-color molds in the entire plastic industry. By improving the mold structure, it saves injection molding machines. The key point is that it can effectively solve the investment in two-color machines, reduce the product rate by 50%, meet the production requirements, while reducing the investment cost and improving the production efficiency.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0035] For the sake of convenience in description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper..." etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0036] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0037] The above has introduced in detail a rotary two-color in-mold injection molding structure provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present application.

Claims

1. An in-mold rotating two-color injection molding structure, comprising a lower mold frame (200), a lower mold core (100) arranged at the upper end of the lower mold frame (200), and a lower fixing plate (300) installed at the bottom of the lower mold frame (200), characterized in that: In the middle of the lower end of the described lower die core (100), a rotating shaft (400) is provided which penetrates through the lower die frame (200) and the lower fixing plate (300). A gear (500) is sleeved on the rotating shaft (400). One end of the rotating shaft (400) is connected to a driving device on the injection molding machine table. The driving device controls the rotating shaft (400) to eject the lower die core (100) out of the lower die frame (200) or retract the lower die core (100) into the lower die frame (200). A power mechanism which meshes with the gear (500) and drives the rotating shaft (400) to rotate is installed between the lower fixing plate (300) and the lower die frame (200). A plurality of molding cavities are uniformly arranged on the lower die core (100), and each molding cavity is composed of a first-color cavity (101) and a second-color cavity (102).

2. The in-mold rotating two-color injection molding structure according to claim 1, wherein: The described power mechanism includes a power oil cylinder (201) fixed to the outside of the lower die frame (200) and a driving rack (202) fixed to the piston rod of the power oil cylinder (201). The driving rack (202) meshes with the gear (500).

3. The in-mold rotating two-color injection molding structure according to claim 2, wherein: An auxiliary rack (203) which slides back and forth is installed between the lower die frame (200) and the lower fixing plate (300). The auxiliary rack (203) is arranged in parallel with the driving rack (202) and is located on both sides of the gear (500) respectively.

4. The in-mold rotating two-color injection molding structure according to claim 3, wherein: A long strip-shaped limiting groove (204) is opened along the length direction on one side of the auxiliary rack (203). A limiting block (205) inserted into the limiting groove (204) is fixedly installed at the lower end of the lower die frame (200).

5. The in-mold rotating two-color injection molding structure according to claim 2, characterized in that: The piston rod of the power oil cylinder (201) is connected with a T-shaped block (206), and a clamping groove matched with the T-shaped block (206) is opened at one end of the driving rack (202).

6. The in-mold rotating two-color injection molding structure according to claim 1, characterized in that: A wear-resistant block (301) is embedded and installed on the lower fixing plate (300), and the wear-resistant block (301) is attached to the driving rack (202).

7. The in-mold rotating two-color injection molding structure according to claim 1, wherein: Force-bearing bearings (600) which cooperate with the rotating shaft (400) are provided inside both the lower die frame (200) and the lower fixing plate (300).

8. The in-mold rotating two-color injection molding structure according to claim 7, characterized in that: The force-bearing bearing (600) is a tapered roller bearing.

9. The in-mold rotating two-color injection molding structure according to claim 1, wherein: Cooling pipelines are arranged inside the lower die core (100) corresponding to each molding cavity. A plurality of water channel structures (401) are arranged around the circumference on the end face of the rotating shaft (400). The water channel structures (401) are arranged along the axial direction of the rotating shaft (400). One end of each water channel structure (401) is connected with a water pipe, and the other end of each water channel structure (401) is communicated with the corresponding cooling pipeline respectively.

10. The in-mold rotating two-color injection molding structure according to claim 1, characterized in that: Long strip-shaped key grooves (402) are axially opened on both sides of the rotating shaft (400). The upper ends of the key grooves (402) penetrate through the upper end face of the rotating shaft (400). Protrusions (501) which cooperate with the key grooves (402) are arranged on the inner wall of the gear (500).

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