A structure suitable for realizing secondary precision injection molding in a set of molds

Abstract

The present invention relates to the technical field of secondary precision injection molding, specifically a structure suitable for realizing secondary precision injection molding in a set of molds, comprising an upper fixed plate, and a stripping plate installed below the stripping plate through a guide column assembly, and an upper template is connected below the stripping plate, while the lower template is connected to the lower fixed plate through a spacer plate, and the interior of the track plate is connected to a base through a movable control assembly, and the interior of the base is installed with a first upper cavity and a second upper cavity from left to right, and the interior of the lower template is installed with a mounting plate located below the track plate, and the interior of the mounting plate is provided with a lower core located below the base. The structure is suitable for realizing secondary precision injection molding in a set of molds, and secondary precision injection molding can be realized directly in a set of molds without taking and placing products, which can improve production efficiency and pass rate, reduce product manufacturing costs, and facilitate the entire mold to perform injection molding operations well.

Description

Technical Field

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

[0002] When manufacturing some electronic connector products or plastic shells of electronic equipment, some plastic waste can be recycled and turned into raw material plastic melts, and then these raw material plastic melts are made into plastic shells and other products through secondary injection molding molds. Therefore, the secondary injection molding mold can not only recycle plastic waste and avoid the waste of plastic waste, but also perform injection molding on the products, which can realize complex product structures, reduce secondary processing and assembly processes, reduce labor costs, and shorten production cycles;

[0003] For example, the patent name disclosed in the prior art with the publication number "CN115157550A" is "A secondary molding injection mold", which 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, and then the single-color product is clamped by the first pneumatic clamp, and then the translation drive motor is controlled to run, and the translation drive motor drives the gear to rotate, thereby driving the slide bar to translate a set distance through the engagement of the gear and the rack, so that the first pneumatic clamp drives the single-color product to move to the top of the second lower mold core, and then controls the electric lifting and retraction rod to retract, so that the single-color product moves downward and is placed in the second cavity. After completion, the first pneumatic clamp releases the single-color product, and the electric lifting and retraction rod extends to make the first pneumatic clamp move upward and reset, and then controls the rotation drive motor to run 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 the single-color product is formed. The upper casting forms a two-color product, and the next one-color product is injection-molded in the first cavity at the same time, thereby realizing continuous production, and the operation is fast and convenient, which is conducive to improving production efficiency. For example, the patent name disclosed in the prior art with the publication number "CN110640975A" is "Secondary Injection Molding Device and Mobile Phone Case Secondary Injection Molding Process", which discloses that the secondary injection molding device includes a primary injection mold and a secondary injection mold, and the first upper mold of the primary injection mold is provided with a positioning molding cavity for forming a positioning column. The blank is injection-molded in the primary mold to form a primary molded part, and the positioning column of the primary molded part is placed in the secondary injection mold as a positioning reference for the second injection molding. The primary molded part is injection-molded in the secondary injection mold to form a secondary molded part, and the positioning column and other structures in the secondary molded part are removed by CNC to form a finished mobile phone case, and the outer surface is not processed.

[0004] The secondary precision injection molding structure in the above-mentioned prior art needs to take out the product from the first injection mold before placing it in the secondary mold for injection molding when in use. This makes it impossible to achieve secondary precision injection molding in a set of molds, which in turn leads to a long time spent on taking and placing the product. Therefore, the product taking and placing efficiency is low, the defective rate is high, and the injection molding operation of the later model is affected. Therefore, we propose a structure suitable for achieving secondary precision injection molding in a set of molds to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a structure suitable for realizing secondary precision injection molding in a set of molds, so as to solve the problem that the secondary precision injection molding structure currently on the market proposed by the above background technology needs to be taken out from the first injection mold before being placed in the secondary mold for injection molding during use. This makes it impossible to realize secondary precision injection molding in a set of molds, which in turn leads to a long time being required to take and place the products. Therefore, the efficiency of product taking and placing is low, the defective rate is high, and the injection molding operation of the later model is affected.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a structure suitable for realizing secondary precision injection molding in a set of molds, comprising an upper fixed plate, and a stripping plate installed thereunder through a guide column assembly, and an upper template is connected to the bottom of the stripping plate, a lower template is arranged below the upper template, and the bottom of the lower template is connected to the lower fixed plate through a spacer plate, a track plate is installed inside the upper template, and the inside of the track plate is connected to a base through a movable control assembly, a first upper cavity and a second upper cavity are installed inside the base from left to right, a mounting plate located below the track plate is installed inside the lower template, and a lower core located below the base is arranged inside the mounting plate.

[0007] Preferably, a sprue sleeve for allowing recycled plastic waste to enter is fixed through the middle of the upper fixed plate, and the lower part of the sprue sleeve is connected to the main channel opened in the stripping plate in upper and lower directions.

[0008] Preferably, the movement control component includes a carrier frame installed on the right side of the upper template, a cylinder is installed on the right side of the carrier frame, and the output end of the left end of the cylinder passes through the carrier frame and is connected to the connecting rod, and the left end of the connecting rod is connected to the base through the connecting control component.

[0009] Preferably, a supporting plate is installed on the bottom surface of the mounting plate, and an ejector plate is installed on the lower fixed plate corresponding to the inner side of the partition plate, and an ejector mechanism is fixed above the ejector plate. The upper end of the ejector mechanism passes through the interior of the supporting plate and the mounting plate and is inserted into the corresponding position in the lower core for ejection operation. The lower end of the guide column assembly passes through the four corners of the upper fixed plate, the stripping plate, the upper template, the lower template and the partition plate and is connected to the lower fixed plate. A molded product is arranged in the lower core, and the molded product consists of a first molding part and a second molding part. The second molding part is connected above the first molding part.

[0010] Preferably, a fixed cover plate is fixed above the base, a first flow channel is opened inside the first upper mold cavity and at corresponding positions inside the upper fixed cover plate, and a second flow channel is opened inside the second upper mold cavity and at corresponding positions inside the upper fixed cover plate, and the first flow channel and the second flow channel are sequentially overlapped with the main flow channel through a mobile control component.

[0011] Preferably, the connection control assembly includes a screw, and the left end of the connecting rod is connected to the right side of the base through the screw.

[0012] Preferably, control grooves are provided on the inner walls of the front and rear sides of the track plate.

[0013] Preferably, the connection control assembly includes a vertical rod installed in a groove opened on the right side of the base, and a connecting block is provided through the outer side of the vertical rod, a reset spring is nested and connected to the outer side of the lower side of the vertical rod, the right side of the connecting block is connected to the connecting rod, and the front and rear side surfaces of the base are fixed with inner convex columns, and the outer side of the inner convex column is rotatably installed through the outer side of the inner convex column, and the outer convex column is snugly inserted into the control groove.

[0014] Preferably, the control groove is arranged in an arc shape.

[0015] Preferably, the middle portion of the control groove is arranged horizontally, and both ends of the control groove are arranged inclined.

[0016] Compared with the prior art, the present invention has the following beneficial effects: it is applicable to realizing a secondary precision injection molding structure in a set of molds, can realize secondary precision injection molding directly in a set of molds, does not need to take and place products, can improve production efficiency and qualified rate, reduce product manufacturing costs, and facilitate the entire mold to perform injection molding operations well. The specific contents are as follows:

[0017] The cylinder and the connecting rod are used in conjunction with each other to drive the base to slide horizontally in the track plate, thereby moving the first upper cavity and the second upper cavity in the base to the position of overlapping with the lower core in sequence for primary injection and secondary injection. Therefore, secondary precision injection molding can be achieved directly in a set of molds without the need to take and place products, which can improve production efficiency and qualified rate, reduce product manufacturing costs, and facilitate the injection molding operation of the entire mold.

[0018] The connection control assembly includes screws, which can stably connect the connecting rod to the base, so that the connecting rod drives the base to slide horizontally stably;

[0019] The connection control assembly includes a connection block and a vertical rod, so that the connection rod drives the base to slide horizontally through the connection block and the vertical rod, and the base can also drive the fixed cover plate to move up and down together 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 side wall of the track plate can be reduced, thereby reducing the friction force, thereby avoiding wear and damage caused by the large friction generated 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.

[0020] Furthermore, by sliding the base and the fixed cover plate horizontally and moving up and down at the same time, the base and the fixed cover plate can generate a certain degree of up and down shaking force, which can then generate a certain shaking force on the first flow channel and the second flow channel in the base and the fixed cover plate, so as to facilitate the shaking of the flow channel condensate in the first flow channel and the second flow channel, thereby facilitating the later auxiliary discharge of the flow channel condensate in the first flow channel and the second flow channel, so as to facilitate the later recovery and recycling of the discharged flow channel condensate as plastic waste. The processed plastic waste can be injection molded into products such as plastic product shells through a secondary injection molding mold again, thereby avoiding the waste of plastic waste.

[0021] Furthermore, the outer boss is rotatably connected to the outer side of the inner boss, thereby reducing the resistance of the inner boss when moving in the control groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 A in the middle is an enlarged structural diagram;

[0025] Figure 4 This is a schematic diagram of the three-dimensional structure of the stripping plate and the upper template being separated according to the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the stripping plate of the present invention when viewed from above;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the track plate of the present invention;

[0028] Figure 7 This is a schematic diagram of the track plate structure from a bottom view according to the present invention;

[0029] Figure 8 This is a schematic diagram of the separation structure of the track plate and the base of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of the base of the present invention when viewed from above;

[0031] Figure 10 Schematic diagram of the three-dimensional structure of the lower core of the present invention;

[0032] Figure 11 This is a schematic diagram of the structure for separating the lower core and the molded product of the present invention;

[0033] Figure 12 For the present invention Figure 11 The enlarged structural diagram at B in the middle;

[0034] Figure 13 This is a schematic diagram of the connection structure between the base and the connecting rod in the second embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram of a partial cross-sectional structure of a track plate in a second embodiment of the present invention;

[0036] Figure 15 This is a schematic diagram of a partial cross-sectional structure showing the separation of the track plate and the base in the second embodiment of the present invention;

[0037] Figure 16 This is a schematic diagram of a partial cross-sectional structure of the track plate in Example 3 of the present invention.

[0038] In the figure: 1. Upper fixed plate; 2. Stripping plate; 201. Main flow channel; 3. Upper template; 4. Lower template; 5. Spacer plate; 6. Lower fixed plate; 7. Ejector plate; 8. Ejector mechanism; 9. Guide column assembly; 10. Gate sleeve; 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 boss; 174. Outer boss; 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 DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] See also Figures 1-16 , the present invention provides the following technical solutions:

[0041] Example 1: This embodiment is suitable for realizing secondary precision injection molding structure in a set of molds. When used, secondary precision injection molding can be realized directly in a set of molds. The whole process does not require taking and placing products, thereby improving production efficiency and qualified rate, and reducing product manufacturing costs. For specific structures, please refer to the attached Figures 1-12As shown, it includes an upper fixed plate 1, and a stripping plate 2 installed below it through a guide column assembly 9, and an upper template 3 is connected to the bottom of the stripping plate 2, and a lower template 4 is provided below the upper template 3. At the same time, the lower template 4 is connected to the lower fixed plate 6 through a spacer plate 5. A track plate 13 is installed inside the upper template 3, and the inside of the track plate 13 is connected to the base 17 through a mobile control assembly. The inside of the base 17 is installed with a first upper cavity 171 and a second upper cavity 172 from left to right, and the inside of the lower template 4 is installed with a mounting plate 14 located below the track plate 13, and the mounting plate 1 4 is provided with a lower core 21 located below the base 17, and a gate sleeve 10 for the recycled plastic waste to enter is fixed through the middle of the upper fixed plate 1, and the lower part of the gate sleeve 10 is connected to the main flow channel 201 opened in the stripping plate 2. The mobile control component includes a carrier 11 installed on the right side of the upper template 3, and 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 passes through the carrier 11 and is connected to the connecting rod 20, and the left end of the connecting rod 20 is connected to the base 17 through the connecting control component. The mounting plate 14 is connected to the base 17 through the connecting control component. A support plate 15 is installed on the bottom surface, and an ejector plate 7 is installed on the lower fixed plate 6 corresponding to the inner side of the spacer plate 5, and an ejector mechanism 8 is fixed above the ejector plate 7. The upper end of the ejector mechanism 8 passes through the interior of the support plate 15 and the mounting plate 14 and is inserted into the corresponding position in the lower core 21 for ejection operation. The lower end of the guide column assembly 9 passes through the four corners of the upper fixed 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 fixed plate 6. A molded product 22 is provided in the lower core 21, and the molded product 22 consists of a first molding part 221 and a second molding part 222. A second molding part 222 is connected to the top of the first molding part 221, a fixed cover plate 16 is fixed above the base 17, a first flow channel 18 is opened in the interior of the first upper mold cavity 171 and the corresponding position in the upper fixed cover plate 16, and a second flow channel 19 is opened in the interior of the second upper mold cavity 172 and the corresponding position in the upper fixed cover plate 16. The first flow channel 18 and the second flow channel 19 are sequentially overlapped with the main flow channel 201 through a moving control component. The connection control component includes screws, and the left end of the connecting rod 20 is connected to the right side of the base 17 by screws.

[0042] First, the entire structure suitable for realizing secondary precision injection molding in a set of molds is moved into the working area. At this time, the bottom surface of the first upper cavity 171 in the base 17 is tightly fitted directly above the lower core 21. At this time, the upper fixed plate 1 is connected to the external injection molding machine, and then the injection molding machine flows the plastic melt into the main channel 201 through the gate sleeve 10 (the plastic melt is the recycled plastic waste). At this time, the main channel 201 flows the plastic melt through the first flow channel 18 in the fixed cover plate 16 into the first flow channel 18 in the first upper cavity 171, and 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, the mold is opened, and the first molded part 221 is manufactured by injection molding in the lower core 21.

[0043] At this time, the upper fixed plate 1, the stripping plate 2 and the upper template 3 are stably separated by the guide column assembly 9, and the upper template 3 is separated from the lower template 4, so that the upper template 3 drives the internal track plate 13 and the base 17 to move together, thereby separating the base 17 from the mounting plate 14 in the lower template 4, and then separating the first upper cavity 171 from the lower core 21 for demoulding, and then starting the cylinder 12, and the cylinder 12 drives the connecting rod 20 to move to the left, and the connecting rod 20 pushes the base 17 to slide to the left in 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 slide in contact with the inner side wall of the track plate 13 to ensure that the base 17 and the fixed cover plate 16 slide stably to the left. When the base 17 slides to a certain position, the cylinder 12 is stopped. At this time, the position of the base 17 is as shown in the attached figure. Figures 1-4 and attached Figure 6As shown, after the waste in the gate sleeve 10 and the main channel 201 is cleaned up, the mold is then closed. (This part is the existing technology and will not be introduced in detail here. The waste in the gate sleeve 10 and the main channel 201 can be recycled and reused, and the processed plastic waste can be injection molded into products such as plastic product shells again through the secondary injection molding mold, thereby avoiding the waste of plastic waste). After closing the mold, the main channel 201 is connected to the top of the second flow channel 19 in the fixed cover plate 16, and the second upper cavity 172 in the base 17 is tightly fitted with the lower core 21 directly below. Then the secondary injection molding is carried out. The injection molding machine flows the plastic melt into the main channel 201 through the gate sleeve 10. At this time, the main channel 201 flows the plastic melt into the second flow channel 19 in the second upper cavity 172 through the second flow channel 19 in the fixed cover plate 16. Then the plastic melt enters between the second upper cavity 172 and the lower core 21 for the second injection molding. At this time, the plastic melt enters After cooling for a period of time, the second molded part 222 is manufactured by injection molding in a specific reserved position on the first molded part 221 in the lower mold core 21. At this time, the first molded part 221 and the second molded part 222 are combined into a molded product 22. Then, the mold is opened in the same way as shown above. At this time, the second upper cavity 172 and the lower core 21 are separated for demoulding. 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 pushes the molded product 22 in the lower mold core 21 upward and demoulds, thereby taking out the molded product 22 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 perform injection molding operations well. At the same time, the raw material plastic melt recycled from plastic waste is conveniently made into products such as plastic product shells through the secondary injection molding mold. Therefore, plastic waste can be recycled and waste of plastic waste can be avoided.

[0044] Example 2: This example is suitable for realizing a secondary precision injection molding structure in a set of molds. On the basis of Example 1, another structure of the connection control component is disclosed, which can avoid wear and damage to the base 17 and the fixed cover 16, and is convenient for improving the service life of the base 17 and the fixed cover 16. For the specific structure, please refer to the attached Figure 13-15As shown, the inner walls of the front and rear sides of the track plate 13 are provided with control grooves 131, and the connection control assembly includes a vertical rod 231 installed in the groove opened on the right side of the base 17, and the outer side of the vertical rod 231 is penetrated by a connecting block 23, and the lower outer side of the vertical rod 231 is nested and connected with a return spring 232. The right side of the connecting block 23 is connected to the connecting rod 20, and the front and rear sides of the base 17 are fixed with an inner convex column 173, and the outer side of the inner convex column 173 is penetrated by a rotatable outer convex column. The outer convex column 174 is inserted into the control groove 131, and the control groove 131 is arranged in an arc shape. When the connecting rod 20 drives the base 17 and the fixed cover plate 16 to move to the right together through the connecting block 23 and the vertical rod 231 in the connecting control assembly, the inner convex columns 173 on the front and rear sides of the fixed cover plate 16 move to the right in the control groove 131. At this time, the outer convex column 174 outside the inner convex column 173 moves and rotates in the control groove 131, which can reduce the outer convex column 17 4 Resistance to movement in the control groove 131. Since the control groove 131 is arranged in an arc shape, the inner protrusion 173 moves rightward in the control groove 131 and drives the base 17 and the fixed cover plate 16 to move upward and then downward. At this time, the vertical rod 231 slides up and down in the connecting block 23. Later, the base 17 can be automatically driven to move downward and reset by the accumulated force of the return spring 232, which will not affect the subsequent injection molding operation. When the base 17 and the fixed cover plate 16 move upward to a certain height, part of the front and rear side surfaces of the base 17 and the front and rear side surfaces of the fixed cover plate 16 will not contact the inner side wall of the track plate 13, thereby reducing 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 plate 13, thereby reducing friction, thereby avoiding large friction between the base 17 and the fixed cover plate 16 and the track plate 13 when they slide horizontally, causing wear and damage, thereby increasing the service life of the base 17 and the fixed cover plate 16.

[0045] Example 3: This example is suitable for realizing a secondary precision injection molding structure in a set of molds. Based on Example 2, another structure of the control groove 131 is disclosed. For the specific structure, please refer to the attached Figure 16As shown, the middle part of the control groove 131 is horizontally arranged, and the two ends of the control groove 131 are inclined. The control groove 131 in this embodiment is designed to be horizontal in the middle part and inclined at both ends, which is the same as the upper half of the isosceles trapezoid. In this way, since the middle part of the control groove 131 is horizontal, the fixed cover plate 16 and the base 17 can maintain a longer moving time after rising to the highest point, thereby extending the time that the partial areas of the front and rear side surfaces of the base 17 and the front and rear side surfaces of the fixed cover plate 16 are not in contact with the inner side wall of the track plate 13, thereby further reducing 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 plate 13, thereby further reducing the friction, thereby further avoiding the base 17 and the fixed cover plate 16 from generating large friction with the track plate 13 when sliding horizontally, thereby causing wear and damage, thereby improving the track plate 13 and the fixed cover plate 16. The service life of the present invention is improved. At the same time, when the base 17 and the fixed cover plate 16 slide horizontally while moving up and down, the base 17 and the fixed cover plate 16 will generate a certain degree of up and down shaking force due to the up and down movement. Then the first flow channel 18 and the second flow channel 19 in the base 17 and the fixed cover plate 16 shake together, which is convenient for shaking the flow channel condensate in the first flow channel 18 and the second flow channel 19, and then the adhesion strength of the flow channel condensate to the inner wall of the first flow channel 18 and the second flow channel 19 can be well reduced, thereby facilitating the discharge of the flow channel condensate in the first flow channel 18 and the second flow channel 19 in the later stage, and then the discharged flow channel condensate as plastic waste is recycled and recycled again, and the processed plastic waste is injection molded into products such as plastic product shells again through the secondary injection molding mold, thereby avoiding the waste of plastic waste and completing a series of tasks.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A structure suitable for realizing secondary precision injection molding in a set of molds, comprising an upper fixing plate (1) and a stripping plate (2) mounted below the upper fixing plate (1) via a guide column assembly (9), wherein an upper template (3) is connected below the stripping plate (2), a lower template (4) is arranged below the upper template (3), and the lower template (4) is connected to the lower fixing plate (6) via a spacer plate (5) below the lower template (4), characterized in that: A track plate (13) is installed inside the upper template (3), and the track plate (13) is connected to a base (17) inside via a mobile control assembly. A first upper cavity (171) and a second upper cavity (172) are installed inside the base (17) from left to right. A mounting plate (14) located below the track plate (13) is installed inside the lower template (4), and a lower core (21) located below the base (17) is provided inside the mounting plate (14). The inner walls of the front and rear sides of the track plate (13) are both provided with control grooves (131); The front and rear sides of the base (17) are both fixed with inner convex columns (173), and the outer side of the inner convex column (173) is rotatably mounted with an outer convex column (174), and the outer convex column (174) is inserted into the control groove (131). The movement control assembly includes a carrier frame (11) installed on the right side of the upper template (3), a cylinder (12) is installed on the right side of the carrier frame (11), and the output end of the left end of the cylinder (12) passes through the carrier frame (11) and is connected to the connecting rod (20), and the left end of the connecting rod (20) is connected to the base (17) through the connection control assembly, and the connection control assembly includes a vertical rod (231) installed in a groove opened on the right side of the base (17), and the outer side of the vertical rod (231) is penetrated by a connecting block (23), the lower outer side of the vertical rod (231) is nested with a reset spring (232), and the right side of the connecting block (23) is connected to the left side of the connecting block (23). The surface is connected to the connecting rod (20), the middle part of the control groove (131) is arranged horizontally, and the two ends of the control groove (131) are arranged in an inclined shape. A fixed cover plate (16) is fixed above the base (17), and a first flow channel (18) is opened in the interior of the first upper cavity (171) and the corresponding position in the fixed cover plate (16) above it, and a second flow channel (19) is opened in the interior of the second upper cavity (172) and the corresponding position in the fixed cover plate (16) above it, and the first flow channel (18) and the second flow channel (19) are sequentially overlapped with the main flow channel (201) through the mobile control component.

2. The structure according to claim 1, which is suitable for realizing secondary precision injection molding in a set of molds, is characterized in that: A sprue sleeve (10) for receiving recycled plastic waste is fixed through the middle of the upper fixed plate (1), and the bottom of the sprue sleeve (10) is connected to the main channel (201) opened in the stripping plate (2) in an upper and lower manner.

3. The structure for realizing secondary precision injection molding in a set of molds according to claim 1, characterized in that: A support plate (15) is installed on the bottom surface of the mounting plate (14), an ejector plate (7) is installed on the lower fixed plate (6) corresponding to the inner side of the spacer plate (5), and an ejector mechanism (8) is fixed above the ejector plate (7). The upper end of the ejector mechanism (8) passes through the interior of the support plate (15) and the mounting plate (14) and is inserted into the corresponding position in the lower core (21) for ejection operation. The lower end of the guide column assembly (9) passes through the four corners of the upper fixed 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 fixed plate (6). A molded product (22) is provided in the lower core (21), and the molded product (22) consists 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).

4. The structure for realizing secondary precision injection molding in a set of molds according to claim 1, characterized in that: The control groove (131) is arranged in an arc shape.

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