Structure suitable for achieving secondary precision injection molding in mold

Abstract

The invention relates to the technical field of secondary precise injection molding, in particular to a structure suitable for achieving secondary precise injection molding in a set of mold, the structure comprises an upper fixing plate and a stripping plate installed below the upper fixing plate through a guide column assembly, an upper mold plate is connected below the stripping plate, and meanwhile the lower portion of a lower mold plate is connected with a lower fixing plate through a partition plate. And the interior of the track plate is connected with a base through a movement control assembly, a first upper cavity and a second upper cavity are formed in the base from left to right, a mounting plate located below the track plate is mounted in the lower mold plate, and a lower mold core located below the base is arranged in the mounting plate. According to the structure suitable for achieving secondary precision injection molding in one set of mold, secondary precision injection molding can be directly achieved in one set of mold, products do not need to be taken and placed, the productivity efficiency and the percent of pass can be improved, the production and manufacturing cost of the products is reduced, and the whole mold can conveniently and well conduct injection molding operation.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary precision injection molding, and specifically to a structure suitable for realizing secondary precision injection molding within a set of molds. Background Art

[0002] When manufacturing some electronic connector products or plastic product shells of electronic devices, etc., some plastic waste can be recycled first to become raw material plastic melt, and then these raw material plastic melts are made into plastic product shells and other products through a secondary injection molding die. Therefore, through the secondary injection molding die, not only can plastic waste be recycled to avoid waste, but also products can be injection-molded, complex product structures can be realized, secondary processing procedures and assembly procedures can be reduced, labor costs can be lowered, and the production cycle can be shortened. For example, in the prior art, the patent with the publication number "CN115157550A" and the patent name "A Secondary Molding Injection Mold" discloses that when the upper mold mechanism and the lower mold mechanism are closed, a single-color product is injection-molded in the first cavity. Then, the single-color product is clamped by the first pneumatic gripper. Next, the translation drive motor is controlled to operate, and the gear is driven by the translation drive motor to rotate. Thus, the slider is translated a set distance through the meshing of the gear and the rack, so that the first pneumatic gripper drives the single-color product to move above the second lower mold core. Then, the electric telescopic rod is controlled to retract, so that the single-color product descends and is placed into the second cavity. After completion, the first pneumatic gripper releases the single-color product, and the electric telescopic rod extends to make the first pneumatic gripper move upward to reset. Then, the rotation drive motor is controlled to operate to move the slide bar out from between the upper mold mechanism and the lower mold mechanism. After completion, the upper mold mechanism and the lower mold mechanism are closed again, and a two-color product is cast on the single-color product while a next single-color product is injection-molded in the first cavity, thereby realizing continuous production and having fast and convenient operation, which is beneficial to improving production efficiency. Another example is the patent with the publication number "CN110640975A" and the patent name "Secondary Injection Molding Device and Secondary Injection Molding Process for Mobile Phone Shells" in the prior art, which discloses that the secondary injection molding device includes a primary injection mold and a secondary injection mold. The first upper mold of the primary injection mold is provided with a positioning molding cavity for molding positioning posts. The blank is injection-molded in the primary mold to form a primary molded part. The positioning posts of the primary molded part are used as positioning references and placed in the secondary injection mold for the second injection molding. After the primary molded part is injection-molded in the secondary injection mold, a secondary molded part is formed. The positioning posts and other structures in the secondary molded part are removed by CNC to form a finished mobile phone shell without processing the outer surface.

[0003] In the secondary precision injection molding structure in the above-mentioned prior art, when in use, the product needs to be taken out of the first injection mold and then put into the secondary mold for injection. This makes it impossible to achieve secondary precision injection molding in a single mold, resulting in a relatively long time required for taking and placing the product. Therefore, the efficiency of taking and placing the product is low, and the defective rate is relatively high, affecting the injection molding operation of the later model. So, we propose a secondary precision injection molding structure applicable to a single mold to solve the problems raised above. Summary of the Invention

[0004] The purpose of the present invention is to provide a secondary precision injection molding structure applicable to a single mold, so as to solve the problem in the background technology that in the current secondary precision injection molding structure on the market, when in use, the product needs to be taken out of the first injection mold and then put into the secondary mold for injection. This makes it impossible to achieve secondary precision injection molding in a single mold, resulting in a relatively long time required for taking and placing the product. Therefore, the efficiency of taking and placing the product is low, and the defective rate is relatively high, affecting the injection molding operation of the later model.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A secondary precision injection molding structure applicable to a single mold, including an upper fixing plate, and a stripping plate installed below it through a guide post assembly. A upper template is connected below the stripping plate, a lower template is arranged below the upper template, and at the same time, the lower template is connected to a lower fixing plate through a spacer plate. A track plate is installed inside the upper template, and a base is connected inside the track plate through a movement control assembly. A first upper cavity and a second upper cavity are installed inside the base from left to right. An installation plate is installed inside the lower template and located below the track plate, and a lower core is arranged inside the installation plate and located below the base.

[0006] Preferably, a sprue bushing for the recycled plastic waste to enter is fixedly penetrated through the middle inside of the upper fixing plate, and the lower part of the sprue bushing is vertically communicated with the main flow channel opened inside the stripping plate.

[0007] Preferably, the movement control assembly includes a carrier installed on the right side surface of the upper template. A cylinder is installed on the right side of the carrier, and the output end of the left end of the cylinder penetrates through the carrier and is connected to a connecting rod. And the left end of the connecting rod is connected to the base through a connection control assembly.

[0008] Preferably, a support plate is installed on the bottom surface of the mounting plate. A thimble plate is installed on the lower fixing plate corresponding to the inner side of the spacer plate, and a thimble mechanism is fixed above the thimble plate. The upper end of the thimble mechanism penetrates through the support plate and the inside of the mounting plate and then inserts into the corresponding position in the lower core for ejection operation. The lower ends of the guide post assemblies penetrate through the four corners of the upper fixing plate, the stripping plate, the upper template, the lower template and the spacer plate and are connected to the lower fixing plate. A molded product is arranged in the lower core, and the molded product is composed of a first molded part and a second molded part. The second molded part is connected above the first molded part.

[0009] Preferably, a fixed cover plate is fixed above the base. First flow channels are respectively opened at corresponding positions inside the first upper cavity and inside the fixed cover plate above. Second flow channels are respectively opened at corresponding positions inside the second upper cavity and inside the fixed cover plate above. The first flow channel and the second flow channel are sequentially overlapped and corresponding to the main flow channel through the movement control assembly.

[0010] Preferably, the connection control assembly includes a screw, and the left end of the connecting rod is connected to the right side surface of the base through the screw.

[0011] Preferably, control grooves are respectively opened on the inner walls of the front and rear side surfaces of the track plate.

[0012] Preferably, the connection control assembly includes a vertical rod installed in a groove opened on the right side surface of the base. A connection block is arranged through the outer side of the vertical rod. A return spring is nested and connected to the outer side below the vertical rod. The right side surface of the connection block is connected to the connecting rod. Inner convex columns are respectively fixed on the front and rear side surfaces of the base. Outer convex columns are rotatably installed through the outer sides of the inner convex columns. The outer convex columns are fittingly inserted into the control grooves.

[0013] Preferably, the control groove is arc-shaped.

[0014] Preferably, the middle part of the control groove is horizontally arranged, and both ends of the control groove are inclined.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The structure applicable to realizing secondary precision injection molding in a set of molds can directly realize secondary precision injection molding in a set of molds without taking and placing products, can improve the production efficiency and qualification rate, reduce the production and manufacturing cost of products, and facilitate the injection molding operation of the whole mold. The specific content is as follows: Through the combined use of the air cylinder and the connecting rod, the base can be driven to horizontally slide in the track plate, so that the first upper cavity and the second upper cavity in the base are sequentially moved to the overlapping positions with the lower core for primary injection molding and secondary injection molding. Therefore, secondary precision injection molding can be directly realized in a set of molds without taking and placing products, can improve the production efficiency and qualification rate, reduce the production and manufacturing cost of products, and facilitate the injection molding operation of the whole mold; The connection control component includes screws. Through the screws, the connecting rod can be stably connected to the base, enabling the connecting rod to drive the base to slide horizontally stably. The connection control component includes a connection block and a vertical rod. When the connecting rod drives the base to slide horizontally through the connection block and the vertical rod, the base can also drive the fixed cover plate to move up and down through the vertical rod. Then, when the base slides horizontally, the contact area between the two side surfaces of the base and the fixed cover plate and the inner wall of the track plate can be reduced, thereby reducing the friction force, avoiding wear and damage caused by excessive friction when the base and the fixed cover plate slide horizontally, and facilitating the improvement of the service life of the base and the fixed cover plate. Furthermore, while the base and the fixed cover plate slide horizontally, they also move up and down, facilitating the generation of a certain degree of up-and-down shaking force on the base and the fixed cover plate. Then, a certain shaking force can be generated on the first flow channel and the second flow channel inside the base and the fixed cover plate, facilitating the shaking of the runner condensate in the first flow channel and the second flow channel. Thus, it is convenient to assist in discharging the runner condensate in the first flow channel and the second flow channel in the later stage, facilitating the recycling of the runner condensate, which is plastic waste, after recovery treatment. The treated plastic waste can be injection molded into products such as plastic product shells again through a secondary injection molding die, thereby avoiding waste of plastic waste.

[0016] Furthermore, the outer convex column is rotatably connected to the outside of the inner convex column, thereby reducing the resistance when the inner convex column moves in the control groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic three-dimensional structure diagram of the present invention; Figure 2 Schematic main cross-sectional structure diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged structure diagram at A in Figure 4 Schematic three-dimensional structure diagram of the stripping plate separated from the upper template of the present invention; Figure 5 Schematic bottom view structure diagram of the stripping plate of the present invention; Figure 6 Schematic three-dimensional structure diagram of the track plate of the present invention; Figure 7 Schematic bottom view structure diagram of the track plate of the present invention; Figure 8 Schematic separated structure diagram of the track plate and the base of the present invention; Figure 9 Schematic bottom view structure diagram of the base of the present invention; Figure 10Schematic diagram of the three-dimensional structure of the lower core of the present invention; Figure 11 Schematic diagram of the separation structure between the lower core of the present invention and the molded product; Figure 12 For the present invention Figure 11 Enlarged structure diagram at position B in the present invention; Figure 13 Schematic diagram of the connection structure between the base and the connecting rod in the second embodiment of the present invention; Figure 14 Partial sectional view structure diagram of the track plate in the second embodiment of the present invention; Figure 15 Partial sectional view structure diagram of the separation between the track plate and the base in the second embodiment of the present invention; Figure 16 Partial sectional view structure diagram of the track plate in the third embodiment of the present invention.

[0018] In the figure: 1. Upper fixing plate; 2. Stripping plate; 201. Main flow channel; 3. Upper template; 4. Lower template; 5. Spacer plate; 6. Lower fixing plate; 7. Ejector plate; 8. Ejector mechanism; 9. Guide post assembly; 10. Sprue bushing; 11. Carrier; 12. Cylinder; 13. Track plate; 131. Control groove; 14. Mounting plate; 15. Support plate; 16. Fixed cover plate; 17. Base; 171. First upper cavity; 172. Second upper cavity; 173. Inner convex column; 174. Outer convex column; 18. First flow channel; 19. Second flow channel; 20. Connecting rod; 21. Lower core; 22. Molded product; 221. First molded part; 222. Second molded part; 23. Connecting block; 231. Vertical rod; 232. Return spring. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1 - 16 , the present invention provides the following technical solutions: Embodiment 1: The structure suitable for realizing secondary precision injection molding in a set of molds in this embodiment can directly realize secondary precision injection molding in a set of molds during use. The whole process does not require taking and placing products, thereby improving the production efficiency and qualification rate and reducing the production and manufacturing cost of products. The specific structure refers to the attached Figures 1 - 12As shown in the figure, it includes an upper fixing plate 1, and a stripping plate 2 installed below it through a guide post assembly 9. A lower template 3 is connected below the stripping plate 2, and a lower template 4 is arranged below the upper template 3. At the same time, the lower template 4 is connected to a lower fixing plate 6 through a spacer plate 5. An orbital plate 13 is installed inside the upper template 3, and a base 17 is connected inside the orbital plate 13 through a movement control component. Inside the base 17, a first upper cavity 171 and a second upper cavity 172 are installed from left to right. An installation plate 14 is installed inside the lower template 4 and is located below the orbital plate 13. A lower core 21 is arranged inside the installation plate 14 and is located below the base 17. A gate sleeve 10 for the recycled plastic waste to enter is fixedly penetrated through the middle inside the upper fixing plate 1. The lower part of the gate sleeve 10 is vertically communicated with a main flow channel 201 opened inside the stripping plate 2. The movement control component includes a carrier 11 installed on the right side surface of the upper template 3. A cylinder 12 is installed on the right side of the carrier 11, and the output end of the left end of the cylinder 12 penetrates through the carrier 11 and is connected to a connecting rod 20. And the left end of the connecting rod 20 is connected to the base 17 through a connection control component. A support plate 15 is installed on the bottom surface of the installation plate 14. A thimble plate 7 is installed on the lower fixing plate 6 corresponding to the inner side of the spacer plate 5. A thimble mechanism 8 is fixed above the thimble plate 7. The upper end of the thimble mechanism 8 penetrates through the support plate 15 and the inside of the installation plate 14 and then inserts into the corresponding position inside the lower core 21 for ejection operation. The lower end of the guide post assembly 9 penetrates through the four corners of the upper fixing plate 1, the stripping plate 2, the upper template 3, the lower template 4 and the spacer plate 5 and is connected to the lower fixing plate 6. A molded product 22 is arranged inside the lower core 21, and the molded product 22 is composed of a first molded part 221 and a second molded part 222. The second molded part 222 is connected above the first molded part 221. A fixed cover plate 16 is fixed above the base 17. A first flow channel 18 is opened at the corresponding position inside the first upper cavity 171 and above the fixed cover plate 16. And a second flow channel 19 is opened at the corresponding position inside the second upper cavity 172 and above the fixed cover plate 16. The first flow channel 18 and the second flow channel 19 are sequentially overlapped and corresponding to the main flow channel 201 through the movement control component. The connection control component includes a screw, and the left end of the connecting rod 20 is connected to the right side surface of the base 17 through the screw.

[0021] First, move the entire structure for realizing secondary precision injection molding within a set of molds into the working area. At this time, the bottom surface of the first upper cavity 171 in the base 17 is closely attached to the position directly above the lower core 21. Then, connect the upper fixing plate 1 to an external injection molding machine. Next, the injection molding machine injects the plastic melt (the plastic melt is the recycled plastic waste) into the main flow channel 201 through the sprue bushing 10. At this time, the main flow channel 201 flows the plastic melt into the first flow channel 18 in the first upper cavity 171 through the first flow channel 18 in the fixed cover plate 16. Then, the plastic melt enters between the first upper cavity 171 and the lower core 21 for the first injection molding. After cooling for a period of time, open the mold, and the first molded part 221 is manufactured by injection molding within the lower core 21.

[0022] At this time, the upper fixing plate 1, the stripping plate 2, and the upper template 3 are stably separated from each other through the guide post assembly 9. The upper template 3 is separated from the lower template 4, causing the upper template 3 to drive the internal track plate 13 and the base 17 to move together. As a result, the base 17 is separated from the mounting plate 14 in the lower template 4, and then the first upper cavity 171 is separated from the lower core 21 for demolding. Then, start the cylinder 12. The cylinder 12 drives the connecting rod 20 to move to the left. The connecting rod 20 pushes the base 17 to slide to the left within the track plate 13 through the connection control assembly. At this time, the front and rear side surfaces of the base 17 and the fixed cover plate 16 are in sliding contact with the inner side wall of the track plate 13, ensuring the stable leftward sliding of the base 17 and the fixed cover plate 16. When the base 17 slides to a certain position, stop the operation of the cylinder 12. At this time, the position of the base 17 is as shown in the appendix Figures 1 - 4 and the appendix Figure 6As shown, after the waste materials in the sprue bushing 10 and the main runner 201 are cleared, the mold is then closed. (This part is prior art and will not be introduced in detail here. The waste materials in the sprue bushing 10 and the main runner 201 can be recycled and reused. The processed plastic waste is then injection molded into plastic product casings and other products through a secondary injection molding die again, thereby avoiding waste of plastic waste.) After closing the mold, the main runner 201 communicates with the second runner 19 directly above the second runner 19 in the fixed cover plate 16. The second upper cavity 172 in the base 17 is in close contact with the lower core 21 directly below. Then secondary injection molding is carried out. The injection molding machine injects the plastic melt into the main runner 201 through the sprue bushing 10. At this time, the main runner 201 flows the plastic melt into the second runner 19 in the second upper cavity 172 through the second runner 19 in the fixed cover plate 16. Then the plastic melt enters between the second upper cavity 172 and the lower core 21 for secondary injection molding. At this time, the plastic melt enters into a specific reserved position on the first forming part 221 in the lower core 21. After cooling for a period of time, the second forming part 222 is injection molded. At this time, the first forming part 221 and the second forming part 222 are combined into the formed product 22. Then, similarly to the above, the mold is opened. At this time, the second upper cavity 172 and the lower core 21 are separated for demolding. Then, the electric push rod on the lower fixed plate 6 drives the ejector plate 7 and the ejector mechanism 8 to move upward together, so that the ejector mechanism 8 ejects the formed product 22 in the lower core 21 upward for demolding. Thus, the formed product 22 can be taken out well. Therefore, the operation is convenient, and there is no need to spend a long time to pick and place the product. Secondary precision injection molding can be directly realized in a set of molds, which is convenient for the entire mold to carry out injection molding operations well. At the same time, through the secondary injection molding die, the raw material plastic melt obtained by recycling the plastic waste can be made into plastic product casings and other products. Therefore, the plastic waste can be recycled and the waste of plastic waste can be avoided.

[0023] Embodiment 2: The structure suitable for realizing secondary precision injection molding in a set of molds in this embodiment discloses another structure of the connection control component on the basis of Embodiment 1, which can avoid wear and damage of the base 17 and the fixed cover plate 16 and is convenient for improving the service life of the base 17 and the fixed cover plate 16. The specific structure is referred to in the attached Figures 13 - 15As shown in the figure, control grooves 131 are provided on the inner walls of the front and rear sides of the track slab 13. The connection control assembly includes a vertical rod 231 installed in the groove opened on the right side of the base 17, and a connection block 23 is penetrated through the outside of the vertical rod 231. A return spring 232 is nested and connected to the outside of the lower part of the vertical rod 231. The right side surface of the connection block 23 is connected to the connecting rod 20. Inner convex columns 173 are fixed on the front and rear sides of the base 17. Outer convex columns 174 are rotatably installed through the outside of the inner convex columns 173. The outer convex columns 174 are fitted and inserted into the control grooves 131. The control grooves 131 are arc-shaped. When the connecting rod 20 drives the base 17 and the fixed cover plate 16 to move to the right together through the connection block 23 and the vertical rod 231 in the connection control assembly, at this time, the inner convex columns 173 on the front and rear sides of the fixed cover plate 16 move to the right in the control grooves 131. At this time, the outer convex columns 174 on the outside of the inner convex columns 173 move and rotate while moving in the control grooves 131, which can reduce the resistance of the outer convex columns 174 moving in the control grooves 131. Since the control grooves 131 are arc-shaped, when the inner convex columns 173 move to the right in the control grooves 131, they drive the base 17 and the fixed cover plate 16 to move upward first and then downward. At this time, the vertical rod 231 slides up and down in the connection block 23. Later, through the energy storage of the return spring 232, the base 17 can be automatically driven to move downward for reset, which will not affect the later injection molding operation. When the base 17 and the fixed cover plate 16 move upward to a certain height position, part of the areas on the front and rear sides of the base 17 and the front and rear sides of the fixed cover plate 16 will not contact the inner side wall of the track slab 13. Therefore, the contact area between the two side surfaces of the fixed cover plate 16 and the base 17 and the inner side wall of the track slab 13 can be reduced, thereby reducing the friction force, so as to avoid large friction between the base 17 and the fixed cover plate 16 and the track slab 13 during horizontal sliding, resulting in wear and damage, and facilitating the improvement of the service life of the base 17 and the fixed cover plate 16.

[0024] Embodiment 3: The structure suitable for realizing secondary precision injection molding in a set of molds in this embodiment discloses another structure of the control groove 131 on the basis of Embodiment 2. The specific structure is referred to in the appendix Figure 16As shown, the middle part of the control groove 131 is horizontally arranged, and both ends of the control groove 131 are inclined. In this embodiment, the control groove 131 is designed such that the middle part is horizontal and both ends are inclined, which is the same as the upper half of an isosceles trapezoid. Since the middle part of the control groove 131 is horizontal, the fixed cover plate 16 and the base 17 can maintain a relatively long movement time after rising to the highest point. Subsequently, the time when partial areas of the front and rear sides of the base 17 and the front and rear sides of the fixed cover plate 16 do not contact the inner wall of the track plate 13 can be extended. Therefore, the contact area between the two side surfaces of the fixed cover plate 16 and the base 17 and the inner wall of the track plate 13 can be further reduced, and then the frictional force can be further reduced. Thus, it can further avoid large friction between the base 17 and the fixed cover plate 16 and the track plate 13 during horizontal sliding, resulting in wear and damage, which is conducive to improving the service life of the track plate 13 and the fixed cover plate 16. At the same time, when the base 17 and the fixed cover plate 16 are horizontally sliding while moving up and down, at this time, due to the up and down movement, the base 17 and the fixed cover plate 16 will generate a certain degree of up and down shaking force. Then, the first flow channel 18 and the second flow channel 19 in the base 17 and the fixed cover plate 16 will shake together, which is convenient for shaking the runner condensate in the first flow channel 18 and the second flow channel 19. Subsequently, the bonding strength between the runner condensate and the inner walls of the first flow channel 18 and the second flow channel 19 can be well reduced. Thus, it is convenient to assist in discharging the runner condensate in the first flow channel 18 and the second flow channel 19 later. Then, the discharged runner condensate, which is plastic waste, is recycled after reprocessing, and the processed plastic waste is again injection-molded into products such as plastic product shells through a secondary injection molding die. Thus, the waste of plastic waste can be avoided, and a series of work can be completed.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A secondary precision injection molding structure applicable to be realized within a set of molds, comprising an upper fixing plate (1), and a stripping plate (2) installed below it through a guide post assembly (9), and a upper template (3) is connected below the stripping plate (2), a lower template (4) is arranged below the upper template (3), and simultaneously the lower template (4) is connected to a lower fixing plate (6) through a spacer plate (5), and it is characterized in that: An orbital plate (13) is installed inside the upper template (3), and a base (17) is connected inside the orbital plate (13) through a movement control component. A first upper cavity (171) and a second upper cavity (172) are installed inside the base (17) from left to right. An installation plate (14) located below the orbital plate (13) is installed inside the lower template (4), and a lower core (21) located below the base (17) is arranged inside the installation plate (14). Control grooves (131) are formed in the inner walls of the front and rear sides of the orbital plate (13). Inner convex columns (173) are fixed on the front and rear sides of the base (17). An outer convex column (174) is rotatably installed through the outside of the inner convex column (173), and the outer convex column (174) is fitted and inserted into the control groove (131).

2. A secondary precision injection molding structure applicable to be realized within a set of molds according to claim 1, characterized in that: A sprue bushing (10) for the recycled plastic waste to enter is fixedly penetrated through the middle inside of the upper fixing plate (1). The lower part of the sprue bushing (10) is vertically communicated with a main flow channel (201) formed inside the stripping plate (2).

3. A secondary precision injection molding structure applicable to a set of molds according to claim 1, characterized in that: The movement control component includes a carrier (11) installed on the right side surface of the upper template (3). A cylinder (12) is installed on the right side of the carrier (11). The output end of the left end of the cylinder (12) penetrates through the carrier (11) and is connected with a connecting rod (20). The left end of the connecting rod (20) is connected with the base (17) through a connection control component.

4. A secondary precision injection molding structure applicable to be realized within a set of molds according to claim 1, characterized in that: A support plate (15) is installed on the bottom surface of the installation plate (14). A thimble plate (7) is installed on the lower fixing plate (6) corresponding to the inner side of the spacer plate (5). A thimble mechanism (8) is fixed above the thimble plate (7). The upper end of the thimble mechanism (8) penetrates through the support plate (15) and the inside of the installation plate (14) and then is inserted into the corresponding position inside the lower core (21) for ejection operation. The lower ends of the guide pillar components (9) penetrate through the four corners of the upper fixing plate (1), the stripping plate (2), the upper template (3), the lower template (4) and the spacer plate (5) and are connected with the lower fixing plate (6). A molded product (22) is arranged inside the lower core (21), and the molded product (22) is composed of a first molded part (221) and a second molded part (222). The second molded part (222) is connected above the first molded part (221).

5. A secondary precision injection molding structure applicable to a set of molds according to claim 3, characterized in that: A fixed cover plate (16) is fixed above the base (17). First flow channels (18) are formed in the inside and the corresponding position inside the upper fixed cover plate (16) corresponding to the first upper cavity (171). Second flow channels (19) are formed in the inside and the corresponding position inside the upper fixed cover plate (16) corresponding to the second upper cavity (172). The first flow channels (18) and the second flow channels (19) coincide with the main flow channel (201) in sequence through the movement control component.

6. The secondary precision injection molding structure applicable to a set of molds according to claim 3, wherein: The connection control component includes a screw. The left end of the connecting rod (20) is connected with the right side surface of the base (17) through the screw.

7. A secondary precision injection molding structure applicable to be realized within a set of molds according to claim 3, characterized in that: The connection control component includes a vertical rod (231) installed in a groove formed on the right side surface of the base (17), and a connection block (23) is disposed through the outer side of the vertical rod (231). A return spring (232) is nested and connected to the outer side below the vertical rod (231). The right side surface of the connection block (23) is connected to the connecting rod (20).

8. A secondary precision injection molding structure applicable to be realized within a set of molds according to claim 1, characterized in that: The control groove (131) is arranged in an arc shape.

9. A secondary precision injection molding structure applicable to be realized within a set of molds according to claim 1, characterized in that: The middle part of the control groove (131) is arranged horizontally, and both ends of the control groove (131) are arranged in an inclined shape.

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