Forming mold and forming method for plastic product processing

Abstract

The invention relates to the technical field of plastic forming molds, in particular to a forming mold for plastic product processing and a forming method.The forming mold comprises a module base, a control connecting port is formed in the side wall of the module base, a first telescopic rod is fixedly installed on the upper portion of the module base, and a fixing base is fixedly installed on the upper surface of the module base; a bottom die is rotationally mounted on the upper surface of the fixed seat, and a movable die is arranged above the bottom die; the mold has the beneficial effects that the bottom mold and the movable mold are designed to form a double-layer mold, the movable mold is designed to be provided with different forming cavities of the first upper mold sealing cover and the second upper mold cavity, two sets of same forming cavities are formed in the corresponding bottom mold, and two independent injection molding pipelines of the first glue injection pipe and the second glue injection pipe are matched; the bottom mold forming cavity rotates to the position below the other mold cavity of the movable mold for secondary injection molding after primary injection molding, so that colors are fully isolated, the situation of permeation pollution is avoided, meanwhile, injection molding operation can be circularly performed, and the injection molding efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic molding dies, and in particular to a molding die and a molding method for processing plastic products. Background Art

[0002] In order to improve the appearance of plastic products, two-color injection molding often occurs in the processing of plastic products. Two-color injection molding refers to the process of injecting two plastics of different colors and types in a certain order through a two-color injection molding machine to organically combine the two plastics into a complete product. In the prior art, the molding of two-color plastic products requires the use of two molds, which are molded in two times, which is inconvenient to use and has low production efficiency.

[0003] The existing Chinese patent document with publication number CN117227085B proposes an injection molding device with a layered injection mold. By starting a lifting cylinder, the lifting cylinder will drive the injection spray gun to move, and the injection spray gun will add injection molding materials into the injection mold. According to the set injection molding sequence, the injection spray guns on the lifting cylinder are mobilized to work in sequence to realize the function of multi-layer injection molding to solve the above problem. However, the two colors of materials are not fully isolated, resulting in color contamination, that is, one color penetrates into another color, affecting the appearance.

[0004] Therefore, the present invention proposes a molding mold and a molding method for processing plastic products, which solves the problem that the two colors of materials are not fully isolated and cause color contamination when the prior art only adjusts the height of the injection gun to achieve multi-layer injection molding. An integrated two-color injection molding module is designed with an independent injection molding pipeline. The bottom mold is designed with two molding cavities, and the movable mold is also designed with two matching cavities. After the bottom mold molding cavity is injected once, it is rotated to the bottom of the other mold cavity of the movable mold for secondary injection molding, so that the colors are fully isolated to avoid infiltration and contamination. Summary of the invention

[0005] The object of the present invention is to provide a molding die and a molding method for processing plastic products to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a molding die for processing plastic products, comprising a mold base, a side wall of the mold base is provided with a control connection port, a telescopic rod 1 is fixedly installed on the top of the mold base, a fixed seat is fixedly installed on the upper surface of the mold base, a bottom mold is rotatably installed on the upper surface of the fixed seat, a movable mold is provided above the bottom mold, and the upper end of the telescopic rod 1 is fixedly connected to the lower surface of the movable mold.

[0007] Preferably, a first molding cavity and a second molding cavity are provided inside the bottom mold, the first molding cavity and the second molding cavity are symmetrically arranged after being rotated 180°, and the first molding cavity and the second molding cavity have the same structure.

[0008] Preferably, sealing grooves are provided on the outer sides of the first molding cavity and the second molding cavity, demoulding sealing rings are movably installed on the bottoms of the first molding cavity and the second molding cavity, and demoulding top columns are fixedly installed on the lower surfaces of the demoulding sealing rings.

[0009] Preferably, a through hole matched with the demoulding top column is provided at the bottom of the bottom mold, and a rotating shaft is fixedly installed in the middle of the lower surface of the bottom mold. The rotating shaft passes through the inner wall of the fixed seat and is rotatably connected to the bottom of the mold base.

[0010] Preferably, cooling pipes are symmetrically arranged inside the bottom mold, and the cooling pipes are arranged in an "8" shape. The cooling pipes are arranged on the outside of the first molding cavity and the second molding cavity. Positioning lock seats are fixedly installed on both sides of the bottom mold, and positioning locking blocks matched with the positioning lock seats are fixedly installed on both sides of the movable mold.

[0011] Preferably, a first upper mold cover and a second upper mold cavity are provided on the lower inner wall of the movable mold, the position of the first upper mold cover is adapted to the position of the first molding cavity, the position of the second upper mold cavity is adapted to the position of the second molding cavity, and sealing rings adapted to the second molding cavity are fixedly installed below the first upper mold cover and the second upper mold cavity.

[0012] Preferably, a molding grid is fixedly installed on the lower surface of the first upper mold cover, a first glue injection tube is arranged above the first upper mold cover, a glue injection connecting tube 1 is fixedly installed in the middle of the first glue injection tube, the first glue injection tube and the glue injection connecting tube 1 are both fixedly installed inside the movable mold, and the glue injection head of the first glue injection tube passes through the upper inner wall of the first upper mold cover.

[0013] Preferably, a second glue injection tube is arranged above the second upper mold cavity, and a second glue injection connecting tube is fixedly installed in the middle of the second glue injection tube. The second glue injection tube and the second glue injection connecting tube are both fixedly installed inside the movable mold, and the glue injection head of the second glue injection tube passes through the top of the second upper mold cavity.

[0014] Preferably, a demoulding top plate is slidably installed inside the fixed seat, and two groups of demoulding top plates are provided. The positions of the two groups of demoulding top plates correspond to the positions of the first molding cavity and the second molding cavity respectively. A top column corresponding to the demoulding top column is fixedly installed on the outer side of the upper surface of the demoulding top plate, and a telescopic rod 2 is provided below the demoulding top plate, and the telescopic rod 2 is fixedly installed inside the module base.

[0015] A molding method for processing plastic products, comprising the following steps: Step 1: Prepare for mold installation. Fix the mold base on the injection molding platform. The control connection port needs to be connected to the control device. Connect the bottom of the rotating shaft to the motor drive shaft. Connect the injection connection pipe 1 to the lower injection molding plastic delivery pipe. Connect the injection connection pipe 2 to the upper injection molding plastic delivery pipe. Step 2, performing a primary injection molding, firstly, when the bottom mold and the movable mold are molded together, the lower layer of plastic material is injected through the first injection pipe, so that the inside of the first molding cavity is injection molded to form the first layer of color molding of the plastic product; Step 3: Perform secondary injection molding. The movable mold is lifted with the cooperation of the telescopic rod 1. The bottom mold rotates 180 degrees and then closes with the movable mold again. At this time, the first molding cavity is located below the second upper mold cavity. The second upper mold cavity area is filled with injection molding again through the second injection tube to form the second layer of color molding of the plastic product. Step 4, demoulding, finally the movable mold is lifted again with the cooperation of telescopic rod 1, and telescopic rod 2 lifts the demoulding top plate after the double-layer mold is injection molded, so that the ejector column lifts the demoulding ejector column and then the demoulding sealing ring ejects the injection molded product for demoulding.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention designs a double-layer mold consisting of a bottom mold and a movable mold, and designs a molding cavity different from the first upper mold cover and the second upper mold cavity for the movable mold, and the corresponding two groups of molding cavities are arranged inside the bottom mold, and two independent injection pipes, the first injection hose and the second injection hose, are used together. After one injection, the bottom mold molding cavity is rotated to the bottom of another mold cavity of the movable mold for secondary injection, so that the colors are fully isolated to avoid infiltration and pollution. At the same time, the injection molding operation can be performed reciprocally, thereby improving the injection molding efficiency, and solving the problem that the two colors of materials are not fully isolated and cause color pollution when the prior art only adjusts the height of the injection gun to achieve multi-layer injection molding. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the structure of the present invention in the mold closing state; Figure 2 This is a schematic diagram of the bottom structure of the module base of the present invention; Figure 3 It is a schematic diagram of the structure of the present invention in the mold splitting state; Figure 4 This is a structural schematic diagram of the bottom mold rotation process of the present invention; Figure 5 This is a schematic diagram of the top view of the bottom mold structure of the present invention; Figure 6 This is a schematic diagram of the bottom mold separation structure of the present invention; Figure 7 This is a schematic diagram of the internal cross-sectional structure of the bottom mold of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the fixing seat of the present invention; Fig. 9 This is a bottom view of the structure of the movable mold of the present invention; Fig.10 This is a schematic diagram of the movable mold disassembly structure of the present invention; Fig.11 This is a schematic diagram of the structure of the present invention in the injection molding state; Fig.12 It is a schematic diagram of the cross-sectional structure of the present invention in a locked state; Fig.13 It is a schematic diagram of the molding method of the present invention.

[0017] In the figure: 1. module base; 11. control connection port; 12. telescopic rod 1; 2. bottom mold; 21. positioning lock seat; 211. key handle-shaped locking card core; 212. spring; 22. first molding cavity; 23. second molding cavity; 24. sealing groove; 25. demoulding sealing ring; 251. demoulding top column; 26. rotating shaft; 27. cooling pipe; 3. moving mold; 31. positioning locking block; 32. first upper mold cover; 321. molding grid; 33. second upper mold cavity; 34. sealing ring; 35. first injection hose; 351. injection connection pipe 1; 36. second injection hose; 351. injection connection pipe 2; 4. fixing seat; 41. demoulding top plate; 411. top column; 42. telescopic rod 2. DETAILED DESCRIPTION

[0018] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1 See also Figures 1 to 12The present invention provides a technical solution: comprising a module base 1, a control connection port 11 is arranged on the side wall of the module base 1, a telescopic rod 12 is fixedly installed on the top of the module base 1, a fixing seat 4 is fixedly installed on the upper surface of the module base 1, a bottom mold 2 is rotatably installed on the upper surface of the fixing seat 4, a movable mold 3 is arranged on the top of the bottom mold 2, the upper end of the telescopic rod 12 is fixedly connected to the lower surface of the movable mold 3, a first molding cavity 22 and a second molding cavity 23 are arranged inside the bottom mold 2, and the first molding cavity 22 and the second molding cavity 23 are rotated 180 degrees The first molding cavity 22 and the second molding cavity 23 are symmetrically arranged, and the structures are the same. The outer sides of the first molding cavity 22 and the second molding cavity 23 are both provided with sealing grooves 24. The bottoms of the first molding cavity 22 and the second molding cavity 23 are both movably provided with demoulding sealing rings 25. The lower surfaces of the demoulding sealing rings 25 are fixedly provided with demoulding top pillars 251. The bottom of the bottom mold 2 is provided with through holes adapted to the demoulding top pillars 251. The middle part of the lower surface of the bottom mold 2 is fixedly provided with a rotating shaft 26. The rotating shaft 26 penetrates the inner wall of the fixed seat 4 and is rotatably connected with the bottom of the mold assembly base 1. In this embodiment, the bottom of the module base 1 can be fixed on the injection molding platform, the control connection port 11 needs to be connected to the control device, the telescopic rod 12 mainly plays the role of lifting the movable mold 3, the bottom mold 2 is mainly rotated by the rotating shaft 26 at the bottom, and the rotating shaft 26 can be connected to the driving shaft of the motor. The position corresponding structure of the first molding cavity 22 and the second molding cavity 23 is the same. First, when the bottom mold 2 and the movable mold 3 are molded together, the inside of the first molding cavity 22 is injection molded to form the first layer of color molding of the plastic product, and then the movable mold 3 is lifted with the cooperation of the telescopic rod 12, and the bottom mold 2 is rotated 180° and then molded with the movable mold 3 again. At this time, the first molding cavity 22 is located below the second upper mold cavity 33. The second upper mold cavity 33 area is filled with injection molding again to form the second layer color molding of the plastic product. Finally, the movable mold 3 is lifted again with the cooperation of the telescopic rod 12, and the demoulding top column 251 is lifted up, so that the demoulding sealing ring 25 pushes out the double-layer injection-molded plastic product for easy removal and demoulding. In addition, when the bottom mold 2 rotates once, the second molding cavity 23 will be below the first upper mold cover 32, and injection molding can be performed to form the first layer color molding of another group of plastic products. When the second molding cavity 23 is injection molded and demoulded, the bottom mold 2 rotates and resets. At this time, the second molding cavity 23 is below the second upper mold cavity 33 to perform second layer color injection molding of the plastic product. This cycle is repeated to improve the production efficiency of double-layer plastic products.

[0020] Embodiment 2 On the basis of Example 1, in order to accelerate the cooling and molding of the injection molded product inside the bottom mold 2, cooling pipes 27 are symmetrically arranged inside the bottom mold 2, and the cooling pipes 27 are arranged in an "8" shape. The cooling pipes 27 are arranged on the outside of the first molding cavity 22 and the second molding cavity 23. Positioning lock seats 21 are fixedly installed on both sides of the bottom mold 2, and positioning locking blocks 31 compatible with the positioning lock seats 21 are fixedly installed on both sides of the movable mold 3. In this embodiment, two groups of cooling pipes 27 are symmetrically arranged in the upper and lower parts, and connecting ports are arranged at both ends to connect cooling pipes. The cooling pipes 27 are arranged in an "8" shape to surround the first molding cavity 22 and the second molding cavity 23, thereby accelerating the cooling and molding efficiency of the injection molded product.

[0021] Embodiment 3 On the basis of the second embodiment, in order to position and lock the bottom mold 2 and the movable mold 3 when they are molded together, a key handle-shaped locking card core 211 is symmetrically installed on the inner surface of the positioning lock seat 21, and spring pieces 212 are respectively arranged on the outer sides of the key handle-shaped locking card core 211. One side of the spring piece 212 is fixedly connected to the inner surface of the positioning lock seat 21, and locking grooves compatible with the key handle-shaped locking card core 211 are respectively opened on both sides of the bottom of the positioning locking block 31; in this embodiment, when the bottom mold 2 and the movable mold 3 are molded together, the positioning locking block 31 will be inserted into the positioning lock seat 21, the spring piece 212 and the key handle-shaped locking card core 211 are firstly compressed, and then the key handle-shaped locking card core 211 is stuck into the two sides of the positioning locking block 31 under the rebound of the spring piece 212 to complete the locking, so that the bottom mold 2 and the movable mold 3 are more accurately molded together, and the processing accuracy of the injection mold is improved.

[0022] Embodiment 4 On the basis of the third embodiment, in order to make the movable mold 3 better cooperate with the bottom mold 2 to complete the two-color injection molding, the lower inner wall of the movable mold 3 is provided with a first upper mold cover 32 and a second upper mold cavity 33, the position of the first upper mold cover 32 is adapted to the position of the first molding cavity 22, the position of the second upper mold cavity 33 is adapted to the position of the second molding cavity 23, and a sealing ring 34 adapted to the second molding cavity 23 is fixedly installed below the first upper mold cover 32 and the second upper mold cavity 33, a molding grid 321 is fixedly installed on the lower surface of the first upper mold cover 32, and a A first glue injection tube 35, a glue injection connection tube 1 351 is fixedly installed in the middle of the first glue injection tube 35, the first glue injection tube 35 and the glue injection connection tube 1 351 are both fixedly installed inside the movable mold 3, the glue injection head of the first glue injection tube 35 passes through the upper inner wall of the first upper mold cover 32, a second glue injection tube 36 is arranged above the second upper mold cavity 33, a glue injection connection tube 2 361 is fixedly installed in the middle of the second glue injection tube 36, the second glue injection tube 36 and the glue injection connection tube 2 361 are both fixedly installed inside the movable mold 3, and the glue injection head of the second glue injection tube 36 passes through the upper part of the second upper mold cavity 33; In this embodiment, when the bottom mold 2 and the movable mold 3 are molded together, the glue injection connecting pipe 1 351 is connected to the lower injection plastic conveying pipeline, and the lower plastic material is injected through the first glue injection pipe 35. The first upper mold cover 32 closes the molding cavity above the bottom mold 2. The molding grid 321 forms irregular indentations on the contact surface between the upper color and the lower color after the lower layer is injected, which is convenient for increasing the bonding area of ​​the injection material during the second injection, increasing the bonding of the layered workpiece to avoid the occurrence of stratification, and improving the yield rate of the product. The glue injection connecting pipe 2 361 is connected to the upper injection plastic conveying pipeline, and the lower plastic material is injected through the second glue injection pipe 36. The second upper mold cavity 33 forms an upper injection cavity above the molding cavity of the bottom mold 2, so that after the lower layer is injected, the secondary injection is continued above it to avoid the problem of mutual penetration between the injection materials. The sealing ring 34 is inserted into the sealing groove 24 when the bottom mold 2 and the movable mold 3 are molded together to increase the sealing between the molds.

[0023] Embodiment 5 On the basis of the fourth embodiment, in order to facilitate demolding of the injection mold, a demolding top plate 41 is slidably installed inside the fixed seat 4, and two groups of demolding top plates 41 are provided. The positions of the two groups of demolding top plates 41 correspond to the positions of the first molding cavity 22 and the second molding cavity 23 respectively. A top column 411 corresponding to the demolding top column 251 is fixedly installed on the outer side of the upper surface of the demolding top plate 41, and a telescopic rod 42 is provided below the demolding top plate 41. The telescopic rod 42 is fixedly installed inside the module base 1; in this embodiment, the telescopic rod 42 lifts the demolding top plate 41 after the double-layer mold is injection molded, so that the top column 411 lifts the demolding top column 251 and then the demolding sealing ring 25 pushes the injection molded product out for demolding.

[0024] Embodiment 6 See also Fig.13 On the basis of the fifth embodiment, this embodiment further proposes a molding method for plastic product processing, comprising the following steps: Step 1, mold installation preparation, fixing the mold base 1 on the injection molding platform, the control connection port 11 needs to be connected to the control device, the bottom of the rotating shaft 26 is connected to the motor drive shaft, the injection connection pipe 1 351 is connected to the lower injection molding plastic delivery pipeline, and the injection connection pipe 2 361 is connected to the upper injection molding plastic delivery pipeline; Step 2, performing a primary injection molding, firstly, when the bottom mold 2 and the movable mold 3 are molded together, the lower layer of plastic material is injected through the first injection pipe 35, so that the inside of the first molding cavity 22 is injection molded to form the first layer of color molding of the plastic product; Step 3: Perform secondary injection molding. The movable mold 3 is lifted with the cooperation of the telescopic rod 12. The bottom mold 2 rotates 180° and is molded with the movable mold 3 again. At this time, the first molding cavity 22 is located below the second upper mold cavity 33. The second injection tube 36 is used to inject the second upper mold cavity 33 again to form a second layer of color molding of the plastic product. Step 4, demoulding, finally the movable mold 3 is lifted again with the cooperation of the telescopic rod 12, and the telescopic rod 2 42 lifts the demoulding top plate 41 after the double-layer mold is injection molded, so that the top column 411 lifts the demoulding top column 251 and then the demoulding sealing ring 25 pushes the injection molded product out for demoulding.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A molding die for processing plastic products, comprising a mold base (1), a side wall of the mold base (1) being provided with a control connection port (11), and a telescopic rod (12) being fixedly mounted above the mold base (1), characterized in that: A fixed seat (4) is fixedly mounted on the upper surface of the mold assembly base (1); a bottom mold (2) is rotatably mounted on the upper surface of the fixed seat (4); a movable mold (3) is arranged above the bottom mold (2); and the upper end of the telescopic rod (12) is fixedly connected to the lower surface of the movable mold (3).

2. A molding die for processing plastic products according to claim 1, characterized in that: A first molding cavity (22) and a second molding cavity (23) are arranged inside the bottom mold (2); the first molding cavity (22) and the second molding cavity (23) are arranged symmetrically after being rotated 180 degrees; and the first molding cavity (22) and the second molding cavity (23) have the same structure.

3. A molding die for processing plastic products according to claim 2, characterized in that: The outer sides of the first molding cavity (22) and the second molding cavity (23) are both provided with sealing grooves (24); the bottoms of the first molding cavity (22) and the second molding cavity (23) are both movably provided with demoulding sealing rings (25); and the lower surfaces of the demoulding sealing rings (25) are fixedly provided with demoulding top columns (251).

4. A molding die for processing plastic products according to claim 3, characterized in that: The bottom of the bottom mold (2) is provided with a through hole adapted to the demoulding top column (251), and a rotating shaft (26) is fixedly installed in the middle of the lower surface of the bottom mold (2), and the rotating shaft (26) passes through the inner wall of the fixed seat (4) and is rotatably connected to the bottom of the mold assembly base (1).

5. A molding die for processing plastic products according to claim 4, characterized in that: Cooling pipes (27) are symmetrically arranged in the upper and lower parts of the bottom mold (2). The cooling pipes (27) are arranged in an "8" shape. The cooling pipes (27) are arranged outside the first molding cavity (22) and the second molding cavity (23). Positioning lock seats (21) are fixedly mounted on both sides of the bottom mold (2). Positioning locking blocks (31) adapted to the positioning lock seats (21) are fixedly mounted on both sides of the movable mold (3).

6. A molding die for processing plastic products according to claim 1, characterized in that: A first upper mold cover (32) and a second upper mold cavity (33) are provided on the lower inner wall of the movable mold (3); the position of the first upper mold cover (32) matches the position of the first molding cavity (22); the position of the second upper mold cavity (33) matches the position of the second molding cavity (23); and sealing rings (34) matching the second molding cavity (23) are fixedly installed below the first upper mold cover (32) and the second upper mold cavity (33).

7. A molding die for processing plastic products according to claim 6, characterized in that: A molding grid (321) is fixedly mounted on the lower surface of the first upper mold cover (32); a first glue injection tube (35) is arranged above the first upper mold cover (32); a glue injection connecting tube 1 (351) is fixedly mounted in the middle of the first glue injection tube (35); the first glue injection tube (35) and the glue injection connecting tube 1 (351) are both fixedly mounted inside the movable mold (3); and the glue injection head of the first glue injection tube (35) passes through the upper inner wall of the first upper mold cover (32).

8. A molding die for processing plastic products according to claim 7, characterized in that: A second glue injection tube (36) is arranged above the second upper mold cavity (33), and a second glue injection connecting tube (361) is fixedly installed in the middle of the second glue injection tube (36). The second glue injection tube (36) and the second glue injection connecting tube (361) are both fixedly installed inside the movable mold (3), and the glue injection head of the second glue injection tube (36) passes through the top of the second upper mold cavity (33).

9. A molding die for processing plastic products according to claim 8, characterized in that: A demoulding top plate (41) is slidably mounted inside the fixed seat (4), and two groups of the demoulding top plates (41) are provided. The positions of the two groups of the demoulding top plates (41) correspond to the positions of the first molding cavity (22) and the second molding cavity (23), respectively. A top column (411) corresponding to the demoulding top column (251) is fixedly mounted on the outer side of the upper surface of the demoulding top plate (41), and a second telescopic rod (42) is provided below the demoulding top plate (41), and the second telescopic rod (42) is fixedly mounted inside the mold assembly base (1).

10. A molding method for plastic product processing, implemented by a molding die for plastic product processing according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, mold installation preparation, fix the mold base (1) on the injection molding platform, the control connection port (11) needs to be connected to the control device, connect the bottom of the rotating shaft (26) to the motor drive shaft, connect the injection connection pipe 1 (351) to the lower injection molding plastic delivery pipeline, and the injection connection pipe 2 (361) to the upper injection molding plastic delivery pipeline; Step 2, performing a primary injection molding, firstly, when the bottom mold (2) and the movable mold (3) are molded together, the lower layer of plastic material is injected through the first injection tube (35), so that the first molding cavity (22) is injection molded to form the first layer of color molding of the plastic product; Step three, performing secondary injection molding, the movable mold (3) is lifted with the cooperation of the telescopic rod 1 (12), the bottom mold (2) is rotated 180 degrees and then closed with the movable mold (3) again, at this time the first molding cavity (22) is located below the second upper mold cavity (33), and the second upper mold cavity (33) area is filled with injection molding again through the second injection tube (36), forming a second layer of color molding of the plastic product; Step 4, demoulding is performed, and finally the movable mold (3) is lifted again with the cooperation of the telescopic rod 1 (12), and the telescopic rod 2 (42) lifts the demoulding top plate (41) after the double-layer mold is injection molded, so that the ejector column (411) lifts the demoulding ejector column (251) and then the demoulding sealing ring (25) ejects the injection molded product for demoulding.

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