Injection molding system, injection molding control method, and injection molded article

Abstract

The application discloses an injection molding system, an injection molding control method and an injection molding product, and relates to the technical field of injection molding production. The injection molding system comprises first, second, third and fourth molding parts, a driving mechanism and an injection assembly. The driving mechanism can drive the first and third molding parts to rotate, so that the first and fourth molding parts cooperate with each other to form a first semi-product cavity, the second and third molding parts cooperate with each other to form a second semi-product cavity, and the first and third molding parts cooperate with each other to form an injection product cavity. The injection assembly synchronously supplies materials to the first and second semi-product cavities and the injection product cavity, so as to synchronously form the first and second semi-products and the injection product. After the first semi-product reserved in the first molding part and the second semi-product reserved in the third molding part are subjected to secondary injection molding, the injection product is formed, and the inner ring is caused to form a first molding part and the outer ring is caused to form a second molding part. In this way, a high-quality hollow sealed injection product can be formed.

Description

Technical Field

[0001] This application relates to the field of injection molding technology, and in particular to an injection molding system, an injection molding control method, and an injection molded product. Background Technology

[0002] Hollow-sealed injection molded products such as washing machine balance rings are widely used in industrial production and daily life. These products have high requirements for the shape accuracy of the internal hollow structure, the overall structural strength, and the reliability of the sealing joint area. The molding quality is directly related to the operational stability and service life of washing machines and other terminal equipment.

[0003] When producing such hollow seal injection molded products, the relevant technology adopts a method of first molding two parts and then welding them together. Two parts are first injection molded separately, and after the parts cool and solidify, they are then welded together along their joints through secondary processing such as hot plate welding or ultrasonic welding, ultimately forming a complete hollow seal structure.

[0004] However, this method of first molding the components separately and then welding them not only suffers from a lengthy and inefficient production process, but also suffers from the problem of molten plastic overflowing at the joints during welding. This not only affects the internal structure of the hollow product but may also impact the volume consistency and sealing reliability of the final product. Therefore, how to mold high-quality hollow sealing injection molded products without welding has become an urgent technical problem to be solved. Summary of the Invention

[0005] The main objective of this application is to provide an injection molding system, an injection molding control method, and an injection molded product, aiming to solve the technical problem of how to mold high-quality hollow sealed injection molded products without welding.

[0006] On the one hand, an injection molding system is provided, comprising: First molding section, second molding section, third molding section, fourth molding section, drive mechanism and injection assembly; The driving mechanism can drive the first molding part and the third molding part to rotate, so that the first molding part and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the third molding part cooperate to form a second semi-finished product cavity, and the first molding part and the third molding part cooperate to form an injection molded finished product cavity. The injection molding system is configured to cyclically execute a first half-cycle and a second half-cycle. The injection assembly is configured to synchronously feed materials to the first semi-finished product cavity, the second semi-finished product cavity, and the injection finished product cavity, so that in each half-cycle, the first semi-finished product cavity forms a first semi-finished product, the second semi-finished product cavity forms a second semi-finished product, and the injection finished product cavity forms an injection finished product. The injection finished product is a hollow ring, and one of the first semi-finished product and the second semi-finished product is used to construct the upper half-ring and the other is used to construct the lower half-ring. The injection-molded finished product is a first semi-finished product that is periodically molded on the first molding part after the first semi-finished product cavity is pre-formed, and a second semi-finished product that is periodically molded on the third molding part after the second semi-finished product cavity is pre-formed. Simultaneously, the inner ring of the first semi-finished product and the second semi-finished product is formed into a first molded part, and the outer ring of the first semi-finished product and the second semi-finished product is formed into a second molded part.

[0007] In one embodiment, the driving mechanism includes a first driving component and a second driving component; the first molding part includes a first molding cavity and a third molding cavity; the first driving component is used to drive the first molding cavity and the third molding cavity to rotate; the third molding part includes a second molding cavity and a fourth molding cavity; the second driving component is used to drive the second molding cavity and the fourth molding cavity to rotate. Wherein, the first molding cavity and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the second molding cavity cooperate to form a second semi-finished product cavity, and the third molding cavity and the fourth molding cavity cooperate to form an injection molded finished product cavity; Alternatively, the third molding cavity and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the fourth molding cavity cooperate to form a second semi-finished product cavity, and the first molding cavity and the second molding cavity cooperate to form an injection-molded finished product cavity.

[0008] In one embodiment, the first semi-finished product cavity, the second semi-finished product cavity, and the injection-molded finished product cavity formed by mutual cooperation are arranged along a first direction, and the injection-molded finished product cavity is located between the first semi-finished product cavity and the second semi-finished product cavity; The first drive assembly is configured to rotate 180° before each half-cycle injection molding to drive the first molding cavity and the third molding cavity to rotate; the second drive assembly is configured to rotate 180° before each half-cycle injection molding to drive the second molding cavity and the fourth molding cavity to rotate.

[0009] In one embodiment, the injection molding system includes a base and a frame disposed opposite each other in a vertical direction, the first molding part, the second molding part, and the first drive assembly are disposed on the frame, and the third molding part, the fourth molding part, and the second drive assembly are disposed on the base; The frame is configured to move closer to the base before each half-cycle of injection molding to perform a mold closing action; and to move away from the base after each half-cycle of injection molding to perform a mold opening action.

[0010] In one embodiment, the fourth molding part includes a first mold core and a first mold core ejector. The first mold core ejector is located on the side of the first mold core away from the frame and is configured to drive the first semi-finished product formed in the first semi-finished product cavity to be ejected from the first mold core to the first molding cavity or to the third molding cavity when the frame performs the mold opening action.

[0011] In one embodiment, the second molding part includes a second mold core and a second mold core ejector. The second mold core ejector is located on the side of the second mold core away from the machine base, and is configured to drive the second semi-finished product formed in the second semi-finished product cavity to be ejected from the second mold core to the second molding cavity or to the fourth molding cavity when the machine frame performs the mold opening action.

[0012] In one embodiment, the injection assembly includes a first injection section, a second injection section, a third injection section, and a heating device for heating the first injection section, the second injection section, and the third injection section; The first injection part is inserted through the first molding part and is used to supply material to the first semi-finished product cavity formed by the cooperation of the first molding part and the fourth molding part. The second injection part is inserted through the second molding part and is used to supply material to the second semi-finished product cavity formed by the cooperation of the second molding part and the third molding part; The third injection section is inserted through the first molding section and is used to supply material to the injection molded cavity formed by the cooperation of the first molding section and the third molding section.

[0013] In one embodiment, the third injection section includes a first sub-injection section and a second sub-injection section. The first sub-injection section is used to supply material to the inner ring of the injection molded product cavity, and the second sub-injection section is used to supply material to the outer ring of the injection molded product cavity, so as to perform secondary injection molding on the first semi-finished product reserved on the first molding section after half of the first semi-finished product cavity is formed in the first half of the molding section, and the second semi-finished product reserved on the third molding section after half of the second semi-finished product cavity is formed in the second half of the molding section. Simultaneously, the inner ring of the first semi-finished product and the second semi-finished product is formed into a first molded part, and the outer ring of the first semi-finished product and the second semi-finished product is formed into a second molded part. The first semi-finished inner ring and the second semi-finished inner ring each have a first connecting portion on their facing sides, and the first semi-finished outer ring and the second semi-finished outer ring each have a second connecting portion on their facing sides. The first molded part fills the gap between the first semi-finished inner ring and the second semi-finished inner ring by heating and melting, and is engaged with the first connecting portion of the first semi-finished product and the first connecting portion of the second semi-finished product, respectively. The second molded part fills the gap between the first semi-finished outer ring and the second semi-finished outer ring by heating and melting, and is engaged with the second connecting portion of the first semi-finished product and the second connecting portion of the second semi-finished product, respectively.

[0014] On the other hand, an injection molding control method is proposed, which is applied to the injection molding system described above, wherein the injection molding system is configured to cyclically execute a first half cycle and a second half cycle. The injection molding control method includes: The control drive mechanism is operated so that the first molding part and the fourth molding part cooperate to form the first semi-finished product cavity, the second molding part and the third molding part cooperate to form the second semi-finished product cavity, and the first molding part and the third molding part cooperate to form the injection molded finished product cavity; The injection assembly is controlled to operate synchronously in each half-cycle, so that the first semi-finished product cavity forms the first semi-finished product, the second semi-finished product cavity forms the second semi-finished product, and the injection molded product cavity forms the injection molded product.

[0015] In one embodiment, the driving mechanism includes a first driving component and a second driving component; the first molding part includes a first molding cavity and a third molding cavity; and the third molding part includes a second molding cavity and a fourth molding cavity. Controlling the driving mechanism to operate so that the first molding part and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the third molding part cooperate to form a second semi-finished product cavity, and the first molding part and the third molding part cooperate to form an injection-molded finished product cavity includes: In the first half-cycle, the first driving component and the second driving component are controlled to work, so that the first molding cavity and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the second molding cavity cooperate to form a second semi-finished product cavity, and the third molding cavity and the fourth molding cavity cooperate to form an injection molded finished product cavity; In the second half-cycle, the first driving component and the second driving component are controlled to work, so that the third molding cavity and the fourth molding part cooperate to form the first semi-finished product cavity, the second molding part and the fourth molding cavity cooperate to form the second semi-finished product cavity, and the first molding cavity and the second molding cavity cooperate to form the injection molded finished product cavity.

[0016] In one embodiment, the injection molding system includes a base and a frame disposed opposite each other in a vertical direction, the first molding part, the second molding part, and the first drive assembly are disposed on the frame, and the third molding part, the fourth molding part, and the second drive assembly are disposed on the base; The injection molding control method further includes: Before each half-cycle injection molding, the control frame moves closer to the base to perform the mold closing action; After each half-cycle of injection molding is performed, the control frame moves away from the base to perform the mold opening action.

[0017] On the other hand, a finished injection-molded product is proposed, which is manufactured using the injection molding control method described above, and the finished injection-molded product includes: The first semi-finished product and the second semi-finished product are connected and set together. One of the first semi-finished product and the second semi-finished product is used to construct an upper half ring and the other is used to construct a lower half ring. The inner ring of the first semi-finished product and the inner ring of the second semi-finished product have a first connecting part on the facing side, and the outer ring of the first semi-finished product and the outer ring of the second semi-finished product have a second connecting part on the facing side. The first molded part is formed on the inner ring of the first semi-finished product and the second semi-finished product, and is respectively engaged with the first connecting part of the first semi-finished product and the first connecting part of the second semi-finished product. The second molded part is formed on the outer ring of the first semi-finished product and the second semi-finished product, and is engaged with the second connecting part of the first semi-finished product and the second connecting part of the second semi-finished product, respectively.

[0018] In one embodiment, the first semi-finished inner ring has a first flange and the second semi-finished inner ring has a second flange. The first flange and the second flange are respectively provided with the first connecting portion, and the first connecting portion includes a first through hole. The first semi-finished product outer ring has a third flange and the second semi-finished product outer ring has a fourth flange. The third flange and the fourth flange are respectively provided with a second connecting part, and the second connecting part includes a second through hole. The first molded part is formed between the opposing sides of the first flange and the second flange, and has a first engaging portion filled in the first through hole; the second molded part is formed between the opposing sides of the third flange and the fourth flange, and has a second engaging portion filled in the second through hole.

[0019] One or more technical solutions proposed in this application have at least the following technical effects: The molding of the first semi-finished product, the second semi-finished product, and the injection-molded finished product are carried out in parallel at the same stage. By dynamically adjusting the combination relationship of the four molding parts through the drive mechanism, the independent injection molding of the first and second semi-finished products is completed in the same mold, as well as the secondary in-mold welding of the first and second semi-finished products in the cavity of the injection-molded finished product. This ultimately achieves one-time molding and in-mold assembly of the hollow ring structure. It can effectively solve the demolding interference problem in the processing of the ring hollow structure, and greatly improve the concentricity and bonding strength of the injection-molded finished product through in-mold integrated molding. In this way, the occurrence of excessive seams and misalignment can be reduced, the processing difficulty can be significantly reduced, and high-quality hollow sealed injection-molded finished products can be formed without welding. By utilizing the positioning accuracy of the injection molding system itself, the first and second semi-finished products are fused together to form the finished injection molded product. This ensures the integrity of the finished product while effectively addressing the impact of insufficient positioning accuracy and poor sealing on the quality of the injection molded product. The fusion process results in uniform wall thickness of the injection molded product, effectively optimizing the appearance quality of the joints, processing accuracy, and overall structural strength, significantly improving product precision and structural strength. The first molded part, through heating and melting, fills the gap between the inner rings of the first and second semi-finished products, allowing it to directly engage with the first and second semi-finished products after solidification. The second molded part, through heating and melting, fills the gap between the outer rings of the first and second semi-finished products. The gap allows for direct engagement with the first and second semi-finished products after curing, resulting in a sealed injection molded product. The engagement structure enhances the structural strength of the sealing area, preventing deformation of the injection molded product due to shrinkage when the first and second semi-finished products move under the drive of the core and turntable. This ensures the sealing effect and sealing area of ​​the connection between the first and second semi-finished products, thereby improving the shape accuracy and sealing quality of the injection molded product. It also prevents the molten plastic from entering the cavity between the first and second semi-finished products during injection molding, effectively improving the quality of the injection molded product. By controlling the switching and coordination of the four molding parts through the drive mechanism, a continuous cycle can be achieved where the first and second semi-finished products are reserved in place and the injection-molded finished products are injected a second time, thereby realizing continuous processing of injection-molded finished products, effectively improving production efficiency and shortening processing time. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the mold opening state of an embodiment of the injection molding system of this application; Figure 2 This is a schematic diagram of the mold closing state of an embodiment of the injection molding system of this application; Figure 3 This is a schematic diagram of the structure of an embodiment of the injection molding system of this application; Figure 4 This is a partial schematic diagram of an embodiment of the injection-molded finished product of this application; Figure 5 This is a schematic diagram of the first semi-finished product, the second semi-finished product, and the injection-molded finished product of this application; Figure 6 This is a flowchart of an embodiment of the injection molding control method of this application; Figure 7 This is a detailed flowchart of step S100 of the injection molding control method of this application; Figure 8 This is a schematic diagram of the structure of an embodiment of the injection-molded finished product of this application; Figure 9 This is a schematic diagram showing the state after step one is completed in one embodiment of the injection molding control method of this application; Figure 10 This is a schematic diagram showing the state after step two is completed in one embodiment of the injection molding control method of this application; Figure 11 This is a schematic diagram showing the state after step three is completed in one embodiment of the injection molding control method of this application; Figure 12 This is a schematic diagram showing the state after step four is completed in one embodiment of the injection molding control method of this application; Figure 13This is a schematic diagram showing the state after step five is completed in one embodiment of the injection molding control method of this application; Figure 14 This is a schematic diagram showing the state after step six of the injection molding control method of this application has been executed, according to an embodiment of the method.

[0023] Explanation of icon numbers: 10. Injection-molded finished product; 11. First semi-finished product; 12. Second semi-finished product; 13. First molded part; 14. Second molded part; 15. First connecting part; 16a. First blind hole; 16b. Second blind hole; 17a. First flange; 17b. Second flange; 18a. Third flange; 18b. Fourth flange; 110. First molding section; 111. First molding cavity; 112. Third molding cavity; 120. Second molding section; 121. Second mold core; 122. Ejector part of the second mold core; 130. Third molding section; 131. Second molding cavity; 132. Fourth molding cavity; 140. Fourth molding section; 141. First mold core; 142. First mold core ejector; 151. First semi-finished product cavity; 152. Second semi-finished product cavity; 153. Injection molded finished product cavity; 200. Drive mechanism; 210. First drive assembly; 220. Second drive assembly; 300, Injection assembly; 310, First injection section; 320, Second injection section; 330, Third injection section; 331, First sub-injection section; 332, Second sub-injection section; 340, Heating device; 410. Base; 420. Frame.

[0024] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0026] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Hollow-sealed injection-molded products such as washing machine balance rings are widely used in industrial production and daily life. These products have high requirements for the shape accuracy of the internal hollow structure (such as internal shape and dimensional parameters), the overall structural strength, and the reliability of the sealing joint area. The molding quality is directly related to the operational stability and service life of washing machines and other terminal equipment.

[0028] In the production of these hollow seal injection-molded products, related technologies employ a process of first molding two parts separately and then welding them together. After the parts cool and solidify, they are then fused together at the joint using secondary processing methods such as hot plate welding or ultrasonic welding, ultimately forming a complete hollow seal structure. However, this process is not only lengthy and inefficient, but also suffers from several drawbacks. During welding, molten plastic can overflow at the joint, directly compromising the internal shape, dimensional accuracy, and volume stability of the hollow structure. Furthermore, due to the differences in the shapes of the two parts, their shrinkage after cooling after injection molding is inconsistent, easily causing misalignment during welding. This leads to misalignment of the welded area, resulting in a reduced weld fusion zone area, decreased structural strength, and potentially affecting the product's volume consistency and sealing reliability. Furthermore, this processing method requires two sets of molds and two injection molding machines to mold two parts separately, followed by welding after logistics transfer. The processes are sequential, making it impossible to simultaneously perform molding and welding. This not only results in lengthy processes and low production efficiency but also low process pass rates. Additionally, it requires investment in specialized welding equipment, demands stringent mold processing precision, and in some cases, necessitates modifications to the injection molding machine program, leading to high equipment investment costs and high production barriers. Therefore, how to mold high-quality hollow, sealed injection-molded products without welding has become a pressing technical problem to be solved.

[0029] like Figure 1 , Figure 2 , Figure 3 As shown, in order to produce high-quality hollow sealed injection molded products without welding, embodiments of this application provide an injection molding system, an injection molding control method, and an injection molded product.

[0030] The injection molding system includes a first molding section 110, a second molding section 120, a third molding section 130, a fourth molding section 140, a drive mechanism 200, and an injection assembly 300. The drive mechanism 200 can drive the first molding section 110 and the third molding section 130 to rotate, so that the first molding section 110 and the fourth molding section 140 cooperate to form a first semi-finished product cavity 151, the second molding section 120 and the third molding section 130 cooperate to form a second semi-finished product cavity 152, and the first molding section 110 and the third molding section 130 cooperate to form an injection-molded finished product cavity 153. The injection molding system is configured to cyclically execute a first half-cycle and a second half-cycle. The injection assembly 300 is configured to synchronously feed materials to the first semi-finished product cavity 151, the second semi-finished product cavity 152, and the injection finished product cavity 153, so that in each half-cycle, the first semi-finished product cavity 151 forms the first semi-finished product 11, the second semi-finished product cavity 152 forms the second semi-finished product 12, and the injection finished product cavity 153 forms the injection finished product 10. The injection finished product 10 is a hollow ring, and one of the first semi-finished product 11 and the second semi-finished product 12 is used to form the upper half-ring and the other is used to form the lower half-ring.

[0031] like Figure 4 , Figure 5 As shown, the injection-molded finished product 10 is a second injection-molded product 11 that was left on the first molding part 110 after half of the first semi-finished product cavity 151 was formed in the first cycle, and a second semi-finished product 12 that was left on the third molding part 130 after half of the second semi-finished product cavity 152 was formed in the second cycle. Simultaneously, the inner ring of the first semi-finished product 11 and the second semi-finished product 12 is formed into the first molded part 13, and the outer ring of the first semi-finished product 11 and the second semi-finished product 12 is formed into the second molded part 14.

[0032] For example, the first molding section 110 carries the first semi-finished product 11, and the third molding section 130 carries the second semi-finished product 12. A driving assembly moves the first molding section 110 and the third molding section 130, dynamically combining them with the second molding section 120 and the fourth molding section 140 to switch between the first semi-finished product cavity 151, the second semi-finished product cavity 152, and the injection-molded finished product cavity 153. In this way, a single molding process can be completed without changing the structure of the molding section, effectively improving the stability and reliability of the processing.

[0033] The drive mechanism 200 can, but is not limited to, drive the first molding section 110 and the third molding section 130 to rotate via a turntable indexing rotation, or drive the first molding section 110 and the third molding section 130 to move via a robotic arm gripping, thereby displacing the molding sections and realizing the combination and switching of the first semi-finished product cavity 151, the second semi-finished product cavity 152, and the injection molded finished product cavity 153. The dynamic switching of the combination relationship between the four molding sections (first molding section 110, second molding section 120, third molding section 130, and fourth molding section 140) can, but is not limited to, the following cooperation methods: the unloaded first molding section 110 and the fourth molding section 140 close the mold to form the first semi-finished product cavity 151, used to mold the first semi-finished product 11; the unloaded third molding section 130 and the second molding section 120 close the mold to form the second semi-finished product cavity 152, used to mold the second semi-finished product 12; except for the injection molded finished product cavity formed by the cooperation of the third molding section and the fourth molding section during the first half-cycle of machine operation, which may not carry... With semi-finished products, during the second half-cycle after startup and subsequent cyclic execution processes, a first molding part 110 carrying the first semi-finished product 11 pre-formed in the previous half-cycle and a third molding part 130 carrying the second semi-finished product 12 pre-formed in the previous half-cycle are molded together to form an injection molding cavity 153. This cavity allows for the simultaneous molding of the inner ring of the first semi-finished product 11 and the second semi-finished product 12 into a first molded part 13, and the outer ring of the first semi-finished product 11 and the second semi-finished product 12 into a second molded part 14, thereby fusing the first semi-finished product 11 and the second semi-finished product 12 into a complete hollow ring-shaped product. The synchronous feeding of the injection assembly 300 allows the molding of the first semi-finished product 11, the second semi-finished product 12, and the injection molding of the finished product 10 to occur in parallel at the same stage. The driving mechanism 200 controls the switching and coordination of the four molding parts to achieve a continuous cycle of the first semi-finished product 11 and the second semi-finished product 12 being reserved in the corresponding molding parts and the injection molded product 10 for secondary injection molding. Each molding part is provided with at least one molding cavity, and the molding parts are combined by switching the molding cavities to form the semi-finished product cavity and the injection molded product cavity 153. The injection molding system is configured to cyclically execute the first half cycle and the second half cycle. During the continuous cyclic processing, after the mold is opened, the injection molded product 10 is ejected from the injection molded product cavity 153, so that the molding cavities corresponding to the first molding part 110 and the third molding part 130 return to the empty state. Then, the empty molding cavity is rotated by the driving mechanism 200 to enter the next half cycle and is used to mold the semi-finished product.

[0034] This application dynamically adjusts the combination relationship of the four molding parts through a driving component, completing the independent injection molding of the first semi-finished product 11 and the second semi-finished product 12 within the same mold, and the secondary in-mold welding molding of the first semi-finished product 11 and the second semi-finished product 12 within the injection molding cavity 153. The molding of the first semi-finished product 11, the second semi-finished product 12, and the injection molded product 10 are carried out in parallel at the same stage, ultimately achieving one-time molding and in-mold assembly of the hollow annular structure. In this way, the demolding interference problem existing in the processing of the annular hollow structure can be effectively solved, and the concentricity and bonding strength of the injection molded product can be greatly improved through in-mold integrated molding. Unlike related technologies that require the semi-finished products to be processed separately and then assembled into a product by means of adhesive bonding, ultrasonic welding, mechanical snap-fitting, etc., the integrated molding method of this application can reduce the occurrence of excessive seams and misalignment, significantly reduce the processing difficulty, and thus produce a high-quality hollow sealed injection molded product 10 without welding.

[0035] Because the first semi-finished product 11 and the second semi-finished product 12 are pre-reserved in the corresponding molding parts (e.g., the first semi-finished product 11 is pre-reserved in the first molding part 110 and the second semi-finished product 12 is pre-reserved in the third molding part 130), and can be combined with the injection molded product cavity 153 formed after the mold is joined, and the first molded part 13 is formed by simultaneously forming the inner ring of the first semi-finished product 11 and the second semi-finished product 12, and the second molded part 14 is formed by forming the outer ring of the first semi-finished product 11 and the second semi-finished product 12, the finished product processing is completed. The two are fused together into the injection molded product 10 using the positioning accuracy of the mold itself. This ensures the integrity of the injection molded product, and effectively solves the impact of insufficient positioning accuracy and poor sealing on the quality of the injection molded product; the welding process makes the wall thickness of the injection molded product uniform, and the appearance quality of the finished product joint, processing accuracy and overall structural strength are effectively optimized, significantly improving the precision and structural strength of the injection molded product, and improving the quality of the finished product. In this process, the first molded part 13 is heated and melted to fill the gap between the inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12, so that it can directly engage with the first semi-finished product 11 and the second semi-finished product 12 after solidification. Similarly, the second molded part 14 is heated and melted to fill the gap between the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12, so that it can directly engage with the first semi-finished product 11 and the second semi-finished product 12 after solidification, ultimately resulting in a sealed injection-molded product. The interlocking connection structure can improve the structural strength of the sealing area of ​​the component. In this way, deformation of the injection-molded product 10 due to shrinkage can be prevented to a certain extent when the first semi-finished product 11 and the second semi-finished product 12 are transferred under the drive mechanism 200 such as the rotating core and turntable. This ensures the sealing effect of the connection area between the first semi-finished product 11 and the second semi-finished product 12 and the sealing area of ​​the sealing area, thereby improving the shape accuracy and sealing quality of the injection-molded product 10. It also prevents the plastic melt from entering the cavity area between the first semi-finished product 11 and the second semi-finished product 12 during the injection of the first molded part 13 and the second molded part 14, effectively improving the quality of the injection-molded product 10. Furthermore, in the embodiments of this application, by controlling the switching and cooperation of the four molding parts through the drive mechanism 200, a continuous cycle of the first semi-finished product 11 and the second semi-finished product 12 being in place and the injection-molded product being injected again can be realized, thereby realizing continuous processing of the injection-molded product, effectively improving production efficiency and shortening processing time.

[0036] like Figure 3As shown, in one embodiment, the driving mechanism 200 includes a first driving component 210 and a second driving component 220; the first molding part 110 includes a first molding cavity 111 and a third molding cavity 112; the first driving component 210 is used to drive the first molding cavity 111 and the third molding cavity 112 to rotate; the third molding part 130 includes a second molding cavity 131 and a fourth molding cavity 132; the second driving component 220 is used to drive the second molding cavity 131 and the fourth molding cavity 132 to rotate.

[0037] Understandably, all four molding sections have molding cavities, but each molding cavity does not independently constitute a complete semi-finished product cavity or injection-molded finished product cavity 153. The first semi-finished product 11 has a first surface and a second surface, one of which is an outer surface and the other an inner surface; the second semi-finished product 12 has a third surface and a fourth surface, one of which is an outer surface and the other an inner surface. The inner surface of the first semi-finished product 11 and the inner surface of the second semi-finished product 12 face each other and together constitute the inner surface of the injection-molded finished product 10; the outer surface of the first semi-finished product 11 and the outer surface of the second semi-finished product 12 face away from each other and together constitute the outer surface of the injection-molded finished product 10. Both molding cavities of the first molding section 110 (first molding cavity 111 and third molding cavity 112) have the first surface features of the first semi-finished product 11, and the first semi-finished product 11 will remain in the molding cavity of the first molding section 110 after mold opening. Both molding cavities (second molding cavity 131 and fourth molding cavity 132) of the third molding section 130 have the third surface features of the second semi-finished product 12, and the second semi-finished product 12 will remain in the molding cavity of the third molding section 130 after mold opening. The fourth molding cavity 132 may be configured to include a molding cavity (for example, when the fourth molding cavity 132 includes the first mold core 141, the molding cavity is formed in the first mold core 141), and the molding cavity has the fourth surface features of the second semi-finished product 12; the second molding cavity 131 may be configured to include a molding cavity (for example, when the second molding cavity 131 includes the second mold core 121, the molding cavity is formed in the second mold core 121), and the molding cavity has the second surface features of the first semi-finished product 11.

[0038] like Figure 1 , Figure 2 As shown, as an example, the first molding cavity 111 and the fourth molding part 140 cooperate to form the first semi-finished product cavity 151, the second molding part 120 and the second molding cavity 131 cooperate to form the second semi-finished product cavity 152, and the third molding cavity 112 and the fourth molding cavity 132 cooperate to form the injection molded finished product cavity 153.

[0039] As another example, the third molding cavity 112 and the fourth molding part 140 cooperate to form the first semi-finished product cavity 151, the second molding part 120 and the fourth molding cavity 132 cooperate to form the second semi-finished product cavity 152, and the first molding cavity 111 and the second molding cavity 131 cooperate to form the injection molded finished product cavity 153.

[0040] The first molding part 110 and the fourth molding part 140 close together, so that their molding cavities together form the first semi-finished product cavity 151, which is used to mold the first semi-finished product 11; the third molding part 130 and the second molding part 120 close together, so that their molding cavities together form the second semi-finished product cavity 152, which is used to mold the second semi-finished product 12; the molding cavity of the first molding part 110 carrying the pre-molded first semi-finished product 11 and the molding cavity of the third molding part 130 carrying the pre-molded second semi-finished product 12 close together to form the injection molded product cavity 153, which is used to simultaneously mold the first molded part 13 in the inner ring of the first semi-finished product 11 and the second semi-finished product 12, and mold the second molded part 14 in the outer ring of the first semi-finished product 11 and the second semi-finished product 12, and weld the first semi-finished product 11 and the second semi-finished product 12 into a complete hollow ring product, thereby molding the final injection molded product 10. In this way, the first semi-finished product 11 and the second semi-finished product 12 can be precisely aligned during mold closing to a certain extent. After the molten plastic is injected, it can be injection molded into a complete injection-molded product 10 in one go. This not only ensures the integrity of the product (i.e., the injection-molded product 10) and effectively solves the quality problems caused by insufficient positioning accuracy or poor sealing, but also reduces the positioning error caused by the complex assembly method, thereby significantly improving the positioning accuracy, shortening the cycle time, and improving the overall processing efficiency.

[0041] It should be noted that the first molding cavity 111 and the third molding cavity 112 of the first molding part 110 can be interchanged, and the second molding cavity 131 and the fourth molding cavity 132 of the third molding part 130 can be interchanged; this is not limited here.

[0042] In the embodiments of this application, the first driving component 210 and the second driving component 220 can be configured as two relatively independent rotary driving devices, used to drive the first molding part 110 and the second molding part 120 to rotate respectively. After one injection molding is completed and the mold is opened, the first driving component 210 drives the first molding part 110 to rotate, so that the positions of the first molding cavity 111 and the third molding cavity 112 are interchanged; the second driving component 220 drives the second molding part 120 to rotate, so that the positions of the second molding cavity 131 and the fourth molding cavity 132 are interchanged; then the mold is closed and injection molding is performed again. In this way, the molding of the first semi-finished product 11 and the second semi-finished product 12 and the molding of the injection-molded finished product 10 can be carried out in parallel, making the cycle compact and efficient. The first driving component 210 and the second driving component 220 can rotate synchronously after the mold is opened, or they can rotate sequentially, which is not limited.

[0043] In addition to setting independent first driving components 210 and second driving components 220 to drive the first molding part 110 and the second molding part 120 to rotate respectively, in other embodiments, a single driving device can be used to drive the first molding part 110 and the second molding part 120 to rotate synchronously. The specific configuration can be set according to actual conditions and is not limited here.

[0044] like Figure 1 , Figure 2 , Figure 3 As shown, in one embodiment, a first semi-finished product cavity 151, a second semi-finished product cavity 152, and an injection-molded finished product cavity 153, which cooperate with each other, are arranged along a first direction D1, and the injection-molded finished product cavity 153 is located between the first semi-finished product cavity 151 and the second semi-finished product cavity 152. The first drive assembly 210 is configured to rotate 180° before each half-cycle injection molding to drive the first molding cavity 111 and the third molding cavity 112 to rotate; the second drive assembly 220 is configured to rotate 180° before each half-cycle injection molding to drive the second molding cavity 131 and the fourth molding cavity 132 to rotate.

[0045] Understandably, before each half-cycle injection molding and in the mold-open state, the first drive assembly 210 drives the first molding part 110 to rotate, thereby swapping the positions of the first molding cavity 111 and the third molding cavity 112; the second drive assembly 220 drives the third molding part 130 to rotate, thereby swapping the positions of the second molding cavity 131 and the fourth molding cavity 132. For example, the entire cyclic processing can be set to repeatedly execute the first half-cycle and the second half-cycle. In the mold-closing state of the first half-cycle, the first molding cavity 111 and the fourth molding part 140 cooperate to form the first semi-finished product cavity 151, which is used to mold the first semi-finished product 11; the second molding part 120 and the second molding cavity 131 cooperate to form the second semi-finished product cavity 152, which is used to mold the second semi-finished product 12; the third molding cavity 112 and the fourth molding cavity 132 cooperate to form the injection molded product cavity 153, which is used to mold the injection molded product 10. Except for the injection molded product cavity formed by the cooperation of the third molding cavity and the fourth molding cavity in the first half-cycle of the machine start-up process, which may not carry semi-finished products, in the second half-cycle of the machine start-up process and subsequent cyclic execution processes, when the injection molded product cavity 153 is formed, the third molding cavity 112 carries the first semi-finished product 11, and the fourth molding cavity 132 carries the second semi-finished product 12. Subsequently, the mold opens in the second half-cycle, and the finished product is removed from the injection molding cavity 153 formed by the third molding cavity 112 and the fourth molding cavity 132. At this time, the first drive assembly 210 drives the first molding part 110 to rotate 180°, realizing the position exchange between the first molding cavity 111 and the third molding cavity 112; the second drive assembly 220 drives the third molding part 130 to rotate 180°, realizing the position exchange between the second molding cavity 131 and the fourth molding cavity 132. In the mold closes in the second half-cycle, the third molding cavity 112 and the fourth molding part 140 cooperate to form the first semi-finished product cavity 151, used to mold the first semi-finished product 11; the second molding part 120 and the fourth molding cavity 132 cooperate to form the second semi-finished product cavity 152, used to mold the second semi-finished product 12; the first molding cavity 111 carrying the first semi-finished product 11 and the second molding cavity 131 carrying the second semi-finished product 12 cooperate to form the injection molding cavity 153, used to mold the injection molded product 10. Then, the mold opens in the first half of the next cycle, and the injection molded product 10 is removed from the injection molded product cavity 153 formed by the first molding cavity 111 and the second molding cavity 131. This process is repeated to complete the batch processing of injection molded products.

[0046] It should be noted that, for the convenience of illustrating the cyclic processing steps, the first half-cycle and the second half-cycle are used as examples in this application embodiment, and the order of the two is not limited.

[0047] In some alternative embodiments, the first drive assembly 210 may be a stationary mold turntable drive assembly, and the first molding part 110 may be configured as a stationary mold core; the second drive assembly 220 may be a moving mold turntable drive assembly, and the first molding part 110 may be configured as a moving mold turntable.

[0048] In addition, in some other alternative embodiments, when the first semi-finished product cavity 151 and the injection molded product cavity 153, and the second semi-finished product cavity 152 and the injection molded product cavity 153 are arranged in different directions and the arrangement directions intersect, the rotation angle of the first drive component 210 and the second drive component 220 can be set according to the actual arrangement. The angle is not limited to 180°; it can be set according to the actual situation and is not limited here.

[0049] For example, the first molding part 110, the second molding part 120, and the first driving assembly 210 can be integrated into the same plate or connecting seat; the third molding part 130, the fourth molding part 140, and the second driving assembly 220 can be integrated into another plate or connecting seat; a portion of the first molding part 110 is arranged opposite to the fourth molding part 140, and the remaining portion of the first molding part 110 and the second molding part 120 are arranged opposite to the third molding part 130. The above-mentioned relative arrangement can be arranged in a vertical or horizontal direction, which is not limited here.

[0050] like Figure 2 , Figure 3 As shown, in one embodiment, the injection molding system includes a base 410 and a frame 420 disposed opposite each other in the vertical direction. A first molding section 110, a second molding section 120, and a first drive assembly 210 are disposed on the frame 420, while a third molding section 130, a fourth molding section 140, and a second drive assembly 220 are disposed on the base 410. The frame 420 is configured to move closer to the base 410 before each half-cycle of injection molding to perform a mold closing action; and to move away from the base 410 after each half-cycle of injection molding to perform a mold opening action.

[0051] For example, the first molding part 110, the second molding part 120, the first driving assembly 210, the third molding part 130, the fourth molding part 140, and the second driving assembly 220 are arranged opposite each other in the vertical direction. The first molding part 110, the second molding part 120, and the first driving assembly 210 are disposed on the frame 420, and the third molding part 130, the fourth molding part 140, and the second driving assembly 220 are disposed on the base 410. This simplifies the drive design, reduces shaking and offset during processing, and optimizes mold closing rigidity and positioning stability. Furthermore, the vertical arrangement makes it easier to reserve the semi-finished product in the molding cavity after mold opening, reducing the risk of semi-finished product falling off or shifting, and improving the stability of continuous production. Compared with the horizontal arrangement, it is also easier to process hollow ring-shaped products with uniform wall thickness and high precision requirements. Before each injection molding process, a mold closing action must be performed to form a sealed and pressure-resistant first semi-finished product cavity 151, second semi-finished product cavity 152, and injection molded product cavity 153, ensuring that the material fully fills the cavity and is injection molded, thereby optimizing the dimensional accuracy of the injection molded product 10.

[0052] Before each injection molding, the frame 420 moves closer to the base 410 to perform the mold closing action, which facilitates the injection component 300 to simultaneously supply material to the first semi-finished product cavity 151, the second semi-finished product cavity 152 and the injection molded product cavity 153, so that the first semi-finished product cavity 151 simultaneously molds the first semi-finished product 11, the second semi-finished product cavity 152 simultaneously molds the second semi-finished product 12, and the injection molded product cavity 153 simultaneously molds the injection molded product 10.

[0053] After each injection molding is completed, the frame 420 moves away from the base to perform the mold opening action, which provides space for the demolding of the finished injection molded product 10 and the rotation and repositioning of the subsequent drive components. This facilitates the removal of the injection molded product 10 and also facilitates the drive components to drive the first molding part 110 and the third molding part 130 to rotate, thereby causing the first molding cavity 111 and the third molding cavity 112 of the first molding part 110 to exchange positions, and at the same time, causing the second molding cavity 131 and the fourth molding cavity 132 of the third molding part 130 to exchange positions. This facilitates the transfer of the molding cavity of the first molding part 110 reserved with the first semi-finished product 11 and the molding cavity of the third molding part 130 reserved with the second semi-finished product 12, and forms the injection molded product cavity 153, thereby completing the batch processing of the injection molded product 10.

[0054] In this way, it is easy to stably realize the entire process of injection molding of semi-finished products, in-mold pre-reservation, and secondary welding molding of injection molded finished products 10 in continuous cycle production, effectively solving the problems of difficult demolding of hollow ring products, poor assembly accuracy, and low processing efficiency, while greatly improving the reliability of equipment operation and the molding consistency of injection molded finished products 10.

[0055] In some other alternative embodiments, the first molding part 110, the second molding part 120, and the first drive assembly 210 may be disposed on the base 410, and the third molding part 130, the fourth molding part 140, and the second drive assembly 220 may be disposed on the frame 420, without limitation.

[0056] The following embodiments of this application are mainly described using the example of a first molding part 110, a second molding part 120, and a first drive assembly 210 disposed on a frame 420, and a third molding part 130, a fourth molding part 140, and a second drive assembly 220 disposed on a base 410: like Figure 1 , Figure 2 , Figure 3As shown, in one embodiment, the fourth molding section 140 includes a first mold core 141 and a first mold core ejector 142. The first mold core ejector 142 is disposed on the side of the first mold core 141 facing away from the frame 420, and is configured to drive the first semi-finished product 11 formed in the first semi-finished product cavity 151 to be ejected from the first mold core 141 to the first molding cavity 111 or to the third molding cavity 112 when the frame 420 performs a mold opening operation. The first semi-finished product 11 has a first flange 17a on its inner ring. A first blind hole 16a is provided on the outer surface of the first semi-finished product 11 corresponding to the position of the first flange 17a. That is, the first flange 17a faces the first molding cavity 111 and has the first blind hole 16a. At the moment of mold opening, the ejector of the first mold core 141 moves synchronously, driving the first semi-finished product 11, which is formed in the first semi-finished product cavity 151, to be ejected from the first mold core 141 into the first molding cavity 111. This allows the first semi-finished product 11 to remain relatively stationary and held in the first molding cavity 111 during separation. The clamping force generated by the contraction of the first blind hole 16a prevents it from falling off during subsequent rotation, thus ensuring that the first semi-finished product 11 is stably placed in the first molding cavity 111 and will not fall off due to gravity. The first blind hole 16a does not participate in secondary injection molding; it is only used for anti-sticking, anti-deformation, and precise positioning. Its position strictly corresponds to the target mold retention side (first molding cavity 111). The outer ring of the first semi-finished product 11 has a third flange 18a, and the third flange 18a may also have a second blind hole 16b. The relevant description of the third forming cavity 112 can be referred to accordingly, and will not be repeated here.

[0057] When the first molding cavity 111 carrying the first semi-finished product 11 and the second molding cavity 131 carrying the second semi-finished product 12 cooperate to form the injection molded product 10 cavity, the gap between the first semi-finished product 11 and the second semi-finished product 12 is completely filled during the secondary injection molding, achieving a physical interlocking connection between the inner and outer rings. For example... Figure 4 As shown, this application can set the first semi-finished product 11 as the upper half ring and the second semi-finished product 12 as the lower half ring. The height of the lower half ring is higher than that of the upper half ring, that is, the height of the second semi-finished product 12 is higher than that of the first semi-finished product 11 (i.e., H1 > H2). The inner ring of the second semi-finished product 12 has a stronger clamping force, and when the mold is opened, it will naturally pull down the first semi-finished product 11 and separate it from the front mold (first molding cavity 111, third molding cavity 112) as a whole. In addition, the outer periphery of the second semi-finished product 12 is provided with a connecting part (such as... Figure 8 As shown at point A), the connectors in the second molding cavity 131 or the fourth molding cavity 132 are inserted. At the moment of mold opening, the stronger clamping force of the inner ring of the second semi-finished product 12 and the positioning effect of the insertion are used to keep the second semi-finished product 12 in the second molding cavity 131 or the fourth molding cavity 132. At the moment of demolding of the injection molded product cavity, the insertion positioning relationship is simultaneously released, allowing the injection molded product 10 to be removed.

[0058] For example, a molding cavity is provided on the side of the first mold core 141 facing the frame 420, and the first mold core ejector 142 is provided on the side of the first mold core 141 away from the frame 420. This allows the ejection force to act vertically and evenly on the first semi-finished product 11, which to a certain extent avoids damage to the first semi-finished product 11, thereby further improving the quality of the injection molded product 10. In this way, the overall structure of the fourth molding part 140 can be simplified, the design of complex transfer structures can be reduced, and the overall structure of the fourth molding part 140 can be made more compact and reliable. It also ensures the stability and reliability of the demolding process to a certain extent, so as to facilitate the ejection of the first semi-finished product 11 formed in the first semi-finished product cavity 151 to the first molding cavity 111 or the third molding cavity 112 when the mold is opened.

[0059] The first mold core ejector 142 is configured to drive the first semi-finished product 11, which is formed in the first semi-finished product cavity 151, to eject when the frame 420 performs the mold opening action. Unlike ejection after the mold is fully opened, the first molding cavity 111 or the third molding cavity 112 can be used to constrain the first semi-finished product 11, reduce the damage to the first semi-finished product 11 caused by the ejection action, improve the yield, and make the demolding action more stable and controllable. At the same time, after the mold is fully opened, the first semi-finished product 11 can be completely ejected into the first molding cavity 111 or the third molding cavity 112. In this way, the independent ejection waiting time can be saved, the injection molding cycle can be shortened, and the production efficiency can be improved.

[0060] In some alternative embodiments, the fourth molding part 140 may employ a moving mold device, and the first mold core ejector 142 may be configured to include an ejector plate and an ejector rod. The ejector plate drives the ejector rod to move synchronously to eject the first semi-finished product 11, and to leave the ejected first semi-finished product 11 in the molding cavity corresponding to the first molding part 110 (such as the first molding cavity 111 or the third molding cavity 112).

[0061] like Figure 1 , Figure 2 , Figure 3 As shown, in one embodiment, the second molding section 120 includes a second mold core 121 and a second mold core ejector 122. The second mold core ejector 122 is disposed on the side of the second mold core 121 facing away from the machine base 410, and is configured to drive the second semi-finished product 12 formed in the second semi-finished product cavity 152 to be ejected from the second mold core 121 to the second molding cavity 131 or to the fourth molding cavity 132 when the machine frame 420 performs the mold opening operation.

[0062] For example, a molding cavity is provided on the side of the second mold core 121 facing the frame 420, and the second mold core ejector 122 is provided on the side of the second mold core 121 away from the frame 420. This allows the ejection force to act vertically and evenly on the second semi-finished product 12, thus avoiding damage to the second semi-finished product 12 to a certain extent and further improving the quality of the injection molded product 10. In this way, the overall structure of the second molding part 120 can be simplified, the design of complex transfer structures can be reduced, and the overall structure of the second molding part 120 can be made more compact and reliable. It also ensures the stability and reliability of the demolding process to a certain extent, so as to facilitate the ejection of the second semi-finished product 12 formed in the second semi-finished product cavity 152 to the second molding cavity 131 or the fourth molding cavity 132 when the mold is opened. The specific implementation of the second semi-finished product 12 remaining in the second molding cavity 131 or the fourth molding cavity 132 can be referred to the relevant description of the first semi-finished product 11 remaining in the first molding cavity 111 or the third molding cavity 112, which will not be repeated here.

[0063] The second mold core ejector 122 is configured to drive the second semi-finished product 12, which is formed in the second semi-finished product cavity 152, to eject when the frame 420 performs the mold opening action. Unlike ejection after the mold is fully opened, the second semi-finished product 12 can be constrained by the second molding cavity 131 or the fourth molding cavity 132, reducing the damage to the second semi-finished product 12 caused by the ejection action, improving the yield rate, and making the demolding action more stable and controllable. At the same time, after the mold is fully opened, the second semi-finished product 12 can be completely ejected into the second molding cavity 131 or the fourth molding cavity 132. In this way, the independent ejection waiting time can be saved, the injection molding cycle can be shortened, and the production efficiency can be improved.

[0064] In some alternative embodiments, the second molding section 120 may employ a stationary mold device, and the second mold core ejector 122 may be configured to include an ejector plate and an ejector rod. The ejector plate drives the ejector rod to move synchronously to eject the second semi-finished product 12, so that the ejected second semi-finished product 12 remains in the molding cavity corresponding to the third molding section 130 (such as the second molding cavity 131 or the fourth molding cavity 132).

[0065] In some embodiments, the injection molding system further includes a material handling assembly (not shown), which can be configured as at least one of an ejector assembly, a push plate, a robot, and a conveyor belt. Taking an ejector assembly and a robot as an example, the ejector assembly can be disposed on at least one of the first molding section 110 and the third molding section 130. After the injection molded product 10 is formed in the injection molded cavity 153 and the frame 420 performs the mold opening action, the ejector assembly ejects the injection molded product 10, and at the same time, the robot removes the injection molded product 10 before the mold closes. In this way, processing errors caused by failure to remove the injection molded product 10 in time can be reduced, effectively improving processing efficiency and reliability, and facilitating continuous production and batch processing of injection molded products 10.

[0066] like Figure 3 As shown, in one embodiment, the injection assembly 300 includes a first injection section 310, a second injection section 320, a third injection section 330, and a heating device 340 for heating the first injection section 310, the second injection section 320, and the third injection section 330. The first injection section 310 passes through the first molding section 110 and is used to supply material to the first semi-finished product cavity 151 formed by the cooperation of the first molding section 110 and the fourth molding section 140; the second injection section 320 passes through the second molding section 120 and is used to supply material to the second semi-finished product cavity 152 formed by the cooperation of the second molding section 120 and the third molding section 130; the third injection section 330 passes through the first molding section 110 and is used to supply material to the injection-molded finished product cavity 153 formed by the cooperation of the first molding section 110 and the third molding section 130. In this way, the processing quality of the first semi-finished product 11, the second semi-finished product 12 and the injection-molded finished product 10 can be improved, and the different requirements of the first semi-finished product 11, the second semi-finished product 12 and their connection positions on injection materials, mechanical properties and sealing performance can be met, thereby significantly improving the processing quality of the semi-finished products and the final injection-molded finished product 10.

[0067] Depending on the specific processing requirements, the first injection section 310 may include one or more nozzles. When multiple nozzles are provided, they are spaced apart along the periphery of the first semi-finished product cavity 151. The arrangement of multiple nozzles shortens the melt flow path, achieves balanced filling, and disperses weld lines. The nozzles of the second injection section 320 and the third injection section 330 can be correspondingly arranged without limitation. It should be noted that the heating device 340 may employ a hot runner system. To prevent premature solidification and blockage of the material at the nozzles, each nozzle can be equipped with an independent heating component (such as a hot runner heating coil), and the heating temperature can be controlled by a temperature control system, thereby ensuring, to a certain extent, uniform and controllable filling behavior during multi-point synchronous injection.

[0068] The injection molding system of this application has a wide range of applications, not only suitable for processing hollow products, but also for joining non-hollow products and providing complete sealing for non-ring-shaped products. Taking the injection-molded finished product 10 as a hollow ring as an example: like Figure 4 , Figure 5 As shown, in one embodiment, one of the first semi-finished product 11 and the second semi-finished product 12 is used to construct the upper half ring of the injection molded product 10, and the other is used to construct the lower half ring of the injection molded product 10. The third injection section 330 includes a first sub-injection section 331 and a second sub-injection section 332. The first sub-injection section 331 is used to supply material to the inner ring of the injection molded product cavity 153, and the second sub-injection section 332 is used to supply material to the outer ring of the injection molded product cavity 153, so as to perform secondary injection molding on the first semi-finished product 11, which was reserved on the first molding section 110 after half-cycle molding of the first semi-finished product cavity 151, and the second semi-finished product 12, which was reserved on the third molding section 130 after half-cycle molding of the second semi-finished product cavity 152, and simultaneously form the first molded part 13 from the inner ring of the first semi-finished product 11 and the second molded part 14 from the outer ring of the first semi-finished product 11 and the second semi-finished product 12.

[0069] The inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12 each have a first connecting portion 15 on their facing sides, and the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12 each have a second connecting portion on their facing sides; the first molded part 13 fills the gap between the inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12 by heating and melting, and is engaged with the first connecting portion 15 of the first semi-finished product 11 and the first connecting portion 15 of the second semi-finished product 12 respectively; the second molded part 14 fills the gap between the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12 by heating and melting, and is engaged with the second connecting portion of the first semi-finished product 11 and the second connecting portion of the second semi-finished product 12 respectively.

[0070] Unlike the single-point injection method that results in a loose connection at the connection points of the first semi-finished product 11 and the second semi-finished product 12, the embodiments of this application provide a first sub-injection section 331 and a second sub-injection section 332 for feeding materials at the inner and outer ring connection points of the first semi-finished product 11 and the second semi-finished product 12, respectively. By simultaneously feeding materials through the first sub-injection section 331 and the second sub-injection section 332, the first molded part 13 and the second molded part 14 are simultaneously formed at the inner and outer ring positions. The high-temperature molten plastic from the first sub-injection section 331 and the second sub-injection section 332 during injection molding melts and re-solidifies the already solidified inner and outer ring positions of the first semi-finished product 11 and the second semi-finished product 12, allowing the first molded part 13 to fill the first semi-finished product 14 through heating and melting. The gap between the inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12 is filled by the residual heat of the inner ring first connecting part 15, so that after curing, a first engaging part can be formed that directly engages with the first connecting part 15 of the first semi-finished product 11 and the first connecting part 15 of the second semi-finished product 12 respectively; similarly, the second molded part 14 is heated and melted to fill the gap between the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12, and the second connecting part of the outer ring is filled by the residual heat of the outer ring, so that after curing, a second engaging part can be formed that directly engages with the second connecting part of the first semi-finished product 11 and the second connecting part of the second semi-finished product 12 respectively; in this way, the first semi-finished product 11 and the second semi-finished product 12 can be fused into a complete hollow ring product, thereby forming a sealed injection molded product 10. The first connecting portion 15 and the second connecting portion can be configured to include blind holes, through holes, grooves, etc. The embodiments of this application not only achieve material-level bonding of the first semi-finished product 11 and the second semi-finished product 12 through hot melting, but also significantly enhance the bonding strength at the connection point by utilizing physical nesting and the formed interlocking connection structure. While ensuring the hollow sealing performance of the molded injection-molded product 10, it significantly enhances the pull-out force and shear resistance at the joint between the first semi-finished product 11 and the second semi-finished product 12, avoiding the risk of weakening or debonding of the connection interface that may occur from relying solely on hot melting bonding. This also further optimizes processing quality, effectively increases the strength of the component's sealing area, and is suitable for processing annular structures with strict requirements for sealing performance, dimensional accuracy, and service life, such as washing machine balance rings. It can also be used to process support rings, shock-absorbing rings, etc.; however, this is not limited to these applications.

[0071] Unlike related technologies that utilize welding connections and require snap-fit ​​structures at the inner and outer ring positions, which presents difficulties in achieving a proper connection, this application provides a first connecting portion 15 on the facing sides of the inner rings of the first semi-finished product 11 and the second semi-finished product 12, and a second connecting portion on the facing sides of the outer rings of the first semi-finished product 11 and the second semi-finished product 12. To prevent product deformation due to shrinkage during rotation or other positional transfers after molding, the first connecting portion 15 and the second connecting portion can be configured as blind holes or through holes. The blind hole and through hole structures facilitate implementation... The tight interlocking further ensures the sealing area of ​​the inner and outer ring sealing regions, thereby improving the product shape accuracy and sealing quality. It also prevents the plastic melt from entering the cavity area between the inner and outer rings of the first semi-finished product 11 and the second semi-finished product 12 during injection molding. Since the first semi-finished product 11, the second semi-finished product 12, the first molded part 13, and the second molded part 14 are mainly formed and connected in the cavity and mold, the first connecting part 15 and the second connecting part are designed with blind holes and through holes to improve the alignment accuracy and further optimize the processing effect when processing products with extremely high alignment accuracy requirements.

[0072] In the embodiments of this application, the first connecting part 15 and the second connecting part can be disposed around the periphery of the first semi-finished product 11 and the second semi-finished product 12; or, the inner and outer rings of the first semi-finished product 11 and the second semi-finished product 12 can be provided with flanges, and the flange width is limited, the first connecting part 15 and the second connecting part are respectively disposed at the corresponding flange positions, and the dimensions of the first connecting part 15 and the second connecting part are respectively limited, so as to ensure that the corresponding shear force meets the requirements. The flanged design facilitates demolding, ensuring stability and reliability of the demolding process to a certain extent. It also improves the alignment accuracy of the first semi-finished product 11 and the second semi-finished product 12, preventing deformation of the injection-molded product 10 due to shrinkage during position transfer driven by the rotating core and turntable mechanisms 200. This ensures the sealing effect and sealing area of ​​the connection region between the first and second semi-finished products 11 and 12, improving the shape accuracy and sealing quality of the injection-molded product 10. Furthermore, it prevents molten plastic from entering the cavity between the first and second semi-finished products 11 and 12 during injection molding of the first and second molded parts 13 and 14, further optimizing processing quality and effect. Thus, it not only ensures the integrity of the product (i.e., the injection-molded product 10) and effectively solves quality problems caused by insufficient positioning accuracy or poor sealing, but also reduces positioning errors caused by complex assembly methods, significantly improving positioning accuracy, shortening the cycle time, and enhancing overall processing efficiency.

[0073] In addition, the specific arrangement of the nozzles of the first sub-injection section 331 and the second sub-injection section 332 in the aforementioned embodiments can be referred to the relevant description of the first injection section 310, and will not be repeated here.

[0074] It should be noted that, in the embodiments of this application, the first molded part 13 fills the gap between the inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12 by heating and melting, and is respectively engaged with the first connecting part 15 of the first semi-finished product 11 and the first connecting part 15 of the second semi-finished product 12; the second molded part 14 fills the gap between the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12 by heating and melting, and is respectively engaged with the second connecting part of the first semi-finished product 11 and the second connecting part of the second semi-finished product 12. The aforementioned engagement connection structure is not a simple surface contact, but a fully toothed mechanical interlocking structure, which is used to improve the structural strength of the component sealing area. In this way, the deformation of the injection molded product 10 due to shrinkage can be further prevented when the first semi-finished product 11 and the second semi-finished product 12 are moved under the drive of the core and turntable drive mechanism 200. This can not only ensure the sealing effect of the connection area of ​​the first semi-finished product 11 and the second semi-finished product 12 and the sealing area of ​​the sealing area, thereby improving the shape accuracy and sealing quality of the injection molded product 10, but also prevent the plastic melt from entering the cavity area between the first semi-finished product 11 and the second semi-finished product 12 during the injection of the first molded part 13 and the second molded part 14.

[0075] The embodiments of this application also propose an injection molding control method, which is applied to the injection molding system described above. The injection molding system is configured to cyclically execute a first half-cycle and a second half-cycle. For ease of description, the following injection molding control method is mainly described using controllers, control devices with control functions, and other control devices as the execution entities. The control module can be, but is not limited to, a microcontroller (MCU), a programmable logic controller (PLC), a digital signal processor (DSP), or a field-programmable gate array (FPGA).

[0076] like Figure 6 As shown, the injection molding control methods include: Step S100: Control the drive mechanism to operate so that the first molding part and the fourth molding part cooperate to form the first semi-finished product cavity, the second molding part and the third molding part cooperate to form the second semi-finished product cavity, and the first molding part and the third molding part cooperate to form the injection molded finished product cavity. The drive mechanism can be, but is not limited to, driving the first molding part and the third molding part to rotate by indexing a turntable, or driving the first molding part and the third molding part to move by gripping with a robotic arm, thereby realizing the combination and switching of the first semi-finished product cavity, the second semi-finished product cavity, and the injection molded finished product cavity.

[0077] Step S200: Control the operation of the injection unit to synchronously form the first semi-finished product from the first semi-finished product cavity, the second semi-finished product from the second semi-finished product cavity, and the injection molded product from the injection molded product cavity in each half-cycle. The synchronous feeding of the injection unit allows the forming of the first semi-finished product, the second semi-finished product, and the injection molded product to proceed in parallel at the same stage.

[0078] In the embodiments of this application, each molding part is provided with at least one molding cavity. Under the drive of the driving mechanism, the molding parts are combined and switched to form a semi-finished product cavity and an injection-molded finished product cavity. During continuous cycle processing, after the mold is opened, the injection-molded finished product is ejected from the injection-molded finished product cavity, so that the molding cavities corresponding to the first molding part and the third molding part return to an empty state. Then, the empty molding cavity is rotated under the drive of the driving mechanism to enter the next cycle and is used to mold the semi-finished product.

[0079] This effectively solves the demolding interference problem in the processing of annular hollow structures, and significantly improves the concentricity and bonding strength of the injection molded product through integrated molding. Unlike related technologies that require separate processing of semi-finished products before assembly into a product through adhesive bonding, ultrasonic welding, or mechanical snap-fitting, the integrated molding method of this application reduces the occurrence of excessive seams and misalignment, significantly reducing processing difficulty, and thus producing high-quality hollow sealed injection molded products without welding. Because the first and second semi-finished products are pre-reserved in the corresponding molding parts (e.g., the first semi-finished product is pre-reserved in the first molding part and the second semi-finished product is pre-reserved in the third molding part), and the first and second semi-finished products can be combined by joining the injection molded product cavity formed after the mold is joined, and the first molded part 13 is formed by simultaneously molding the inner ring of the first semi-finished product 11 and the second semi-finished product 12, and the second molded part 14 is formed by simultaneously molding the outer ring of the first semi-finished product 11 and the second semi-finished product 12, the finished product processing is completed, and the two are fused into the injection molded product by utilizing the positioning accuracy of the mold itself. This ensures the integrity of the injection-molded product while effectively addressing the impact of insufficient positioning accuracy and poor sealing on the quality of the injection-molded product. The welding process ensures uniform wall thickness of the injection-molded product, and effectively optimizes the appearance quality of the finished product joints, processing accuracy, and overall structural strength, significantly improving the precision and structural strength of the injection-molded product and enhancing its overall quality.

[0080] The inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12 each have a first connecting portion 15 on their facing sides, and the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12 each have a second connecting portion on their facing sides. The first molded part 13 is heated and melted to fill the gap between the inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12, and the residual heat is used to fill the first connecting portion 15 of the inner ring, so that after curing, it can form a first engaging portion that directly engages with the first connecting portion 15 of the first semi-finished product 11 and the first connecting portion 15 of the second semi-finished product 12, respectively. Similarly, the second molded part 14 is heated and melted to fill the gap between the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12, and the residual heat is used to fill the second connecting portion of the outer ring, so that after curing, it can form a second engaging portion that directly engages with the second connecting portion of the first semi-finished product 11 and the second connecting portion of the second semi-finished product 12, respectively. In this way, the first semi-finished product 11 and the second semi-finished product 12 can be fused together to form a complete hollow ring product, thereby forming a sealed injection molded product 10. The interlocking connection structure can enhance the structural strength of the sealing area of ​​the component. This can, to a certain extent, prevent the deformation of the injection-molded product 10 due to shrinkage when the first semi-finished product 11 and the second semi-finished product 12 are moved under the drive of the rotating core and turntable drive mechanism 200. This ensures the sealing effect of the connection area between the first semi-finished product 11 and the second semi-finished product 12 and the sealing area of ​​this area, thereby improving the shape accuracy and sealing quality of the injection-molded product 10. It also prevents the plastic melt from entering the cavity area between the first semi-finished product 11 and the second semi-finished product 12 during the injection of the first molded part 13 and the second molded part 14, effectively improving the quality of the injection-molded product 10. Furthermore, in the embodiments of this application, by controlling the switching and cooperation of the four molding parts through the drive mechanism, a continuous cycle of the first semi-finished product and the second semi-finished product being in place and the injection-molded product being injected again can be realized, thereby achieving continuous processing of the injection-molded product, effectively improving production efficiency and shortening processing time.

[0081] like Figure 7 As shown, in one embodiment, the driving mechanism includes a first driving component and a second driving component, the first molding part includes a first molding cavity and a third molding cavity, and the third molding part includes a second molding cavity and a fourth molding cavity.

[0082] Step S100: Control the drive mechanism to operate so that the first molding part and the fourth molding part cooperate to form the first semi-finished product cavity, the second molding part and the third molding part cooperate to form the second semi-finished product cavity, and the first molding part and the third molding part cooperate to form the injection molded finished product cavity, including: Step S110: In the first half cycle, control the first drive assembly and the second drive assembly to work, so that the first molding cavity and the fourth molding part cooperate to form the first semi-finished product cavity, the second molding part and the second molding cavity cooperate to form the second semi-finished product cavity, and the third molding cavity and the fourth molding cavity cooperate to form the injection molded finished product cavity. Step S120: In the second half-cycle, control the first drive assembly and the second drive assembly to work, so that the third molding cavity and the fourth molding part cooperate to form the first semi-finished product cavity, the second molding part and the fourth molding cavity cooperate to form the second semi-finished product cavity, and the first molding cavity and the second molding cavity cooperate to form the injection molded finished product cavity.

[0083] The entire cyclic processing is set to cyclically execute steps S110 and S120, that is, cyclically execute the first half cycle and the second half cycle: In the mold-closed state of the first half cycle, the first molding cavity and the fourth molding part cooperate to form the first semi-finished product cavity, which is used to mold the first semi-finished product; the second molding part and the second molding cavity cooperate to form the second semi-finished product cavity, which is used to mold the second semi-finished product; the third molding cavity and the fourth molding cavity cooperate to form the injection molded product cavity, which is used to mold the injection molded product. Among them, except that the injection molded product cavity formed by the cooperation of the third molding cavity and the fourth molding cavity in the first half cycle of the machine start-up process may not carry the semi-finished product, in the second half cycle of the machine start-up process and subsequent cyclic execution processes, when cooperating to form the injection molded product cavity, the third molding cavity carries the first semi-finished product and the fourth molding cavity carries the second semi-finished product. The second half-cycle then enters the mold-opening state, where the finished product is removed from the injection-molded cavity formed by the third and fourth molding cavities. At this time, the first drive assembly rotates the first molding part (e.g., 180°), swapping the positions of the first and third molding cavities. The second drive assembly rotates the third molding part (e.g., 180°), swapping the positions of the second and fourth molding cavities. In the mold-closing state of the second half-cycle, the third and fourth molding cavities cooperate to form the first semi-finished product cavity, used to mold the first semi-finished product; the second molding part cooperates with the fourth molding cavity to form the second semi-finished product cavity, used to mold the second semi-finished product; the first molding cavity carrying the first semi-finished product and the second molding cavity carrying the second semi-finished product cooperate to form the injection-molded product cavity, used to mold the injection-molded product. The next cycle then enters the mold-opening state of the first half-cycle, where the injection-molded product is removed from the injection-molded product cavity formed by the first and second molding cavities. This cycle is repeated to complete the batch processing of injection-molded products.

[0084] In one embodiment, the injection molding system includes a base and a frame disposed opposite each other in the vertical direction, a first molding part, a second molding part and a first drive assembly disposed on the frame, and a third molding part, a fourth molding part and a second drive assembly disposed on the base.

[0085] Injection molding control methods also include: Before each half-cycle injection molding, the control frame moves closer to the base to perform the mold closing action; After each half-cycle of injection molding is completed, the control frame moves away from the base to perform the mold opening action.

[0086] The mold is closed before each half-cycle of injection molding, which facilitates the simultaneous feeding of injection components into the first semi-finished product cavity, the second semi-finished product cavity, and the injection molded product cavity. The mold is opened after each half-cycle of injection molding, which provides space for demolding the finished injection molded product and for the subsequent rotation and repositioning of the drive components. In this way, it is possible to stably realize the entire process of semi-finished product injection, in-mold pre-reservation, and secondary welding to form the injection molded product in continuous cycle production, effectively solving the problems of difficult demolding of hollow ring products, poor assembly accuracy, and low processing efficiency, while significantly improving the reliability of equipment operation and the consistency of injection molded products.

[0087] like Figure 4 , Figure 8 As shown, an embodiment of this application also proposes an injection-molded finished product 10, which is manufactured using the injection molding control method of the above embodiment. The injection-molded finished product 10 includes a first semi-finished product 11 and a second semi-finished product 12 that are mated together. One of the second semi-finished products 12 is used to form an upper half ring, and the other is used to form a lower half ring. The inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12 have first connecting portions 15 on their facing sides, and the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12 have second connecting portions on their facing sides. A first molded part 13 is formed on the inner rings of the first semi-finished product 11 and the second semi-finished product 12, and is engaged with the first connecting portion 15 of the first semi-finished product 11 and the first connecting portion 15 of the second semi-finished product 12, respectively. A second molded part 14 is formed on the outer rings of the first semi-finished product 11 and the second semi-finished product 12, and is engaged with the second connecting portion of the first semi-finished product 11 and the second connecting portion of the second semi-finished product 12, respectively.

[0088] For example, in the molded injection-molded finished product 10, the inner rings of the first semi-finished product 11 and the second semi-finished product 12 each have a first connecting portion 15 on their facing sides, and the outer rings of the first semi-finished product 11 and the second semi-finished product 12 each have a second connecting portion on their facing sides. In order to prevent product deformation caused by shrinkage when the first semi-finished product 11 and the second semi-finished product 12 rotate or undergo other positional transfers after molding, the first connecting portion 15 and the second connecting portion can mainly be configured to include blind holes and through holes. The blind hole and through hole structure can facilitate tight interlocking and further ensure... The sealing area of ​​the inner and outer rings increases the sealing area, thereby improving the product shape accuracy and sealing quality. This prevents the plastic melt from entering the cavity area between the inner and outer rings of the first semi-finished product 11 and the second semi-finished product 12 during injection molding. Since the first semi-finished product 11, the second semi-finished product 12, the first molded part 13, and the second molded part 14 are mainly formed and connected in the cavity and mold, the first connecting part 15 and the second connecting part can be designed with blind holes and through holes to improve the alignment accuracy and further optimize the processing effect when processing products with extremely high alignment accuracy requirements. The first molded part 13 is heated and melted to fill the gap between the inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12, and the residual heat is used to fill the first connecting part 15 of the inner ring, so that after solidification, it can form a first engaging part that directly engages with the first connecting part 15 of the first semi-finished product 11 and the first connecting part 15 of the second semi-finished product 12 respectively; similarly, the second molded part 14 is heated and melted to fill the gap between the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12, and the residual heat is used to fill the second connecting part of the outer ring, so that after solidification, it can form a second engaging part that directly engages with the second connecting part of the first semi-finished product 11 and the second connecting part of the second semi-finished product 12 respectively; in this way, the first semi-finished product 11 and the second semi-finished product 12 can be fused into a complete hollow ring product, thereby forming a sealed injection molded product 10. The embodiments of this application not only achieve material-level bonding of the first semi-finished product 11 and the second semi-finished product 12 through hot melting, but also significantly improve the bonding strength at the connection position of the two by means of physical nesting and the interlocking connection structure formed. Under the premise of ensuring the hollow sealing performance of the molded injection molded product 10, the tensile strength and shear strength at the joint of the first semi-finished product 11 and the second semi-finished product 12 are significantly enhanced, avoiding the risk of weakening of the connection interface or debonding that may occur by simply relying on hot melting bonding.

[0089] The aforementioned interlocking connection structure can enhance the structural strength of the component's sealing area. This, to a certain extent, prevents the first semi-finished product 11 and the second semi-finished product 12 from deforming due to shrinkage during position transfer driven by the rotating core and turntable drive mechanism 200. This ensures the sealing effect of the connection area between the first semi-finished product 11 and the second semi-finished product 12, as well as the sealing area of ​​that area, thereby improving the shape accuracy and sealing quality of the injection molded product 10. Furthermore, it can prevent the molten plastic from entering the cavity area between the first semi-finished product 11 and the second semi-finished product 12 during injection molding of the first molded part 13 and the second molded part 14.

[0090] In the embodiments of this application, the first connecting part 15 and the second connecting part can be disposed around the periphery of the first semi-finished product 11 and the second semi-finished product 12; or, the inner ring and outer ring of the first semi-finished product 11 and the second semi-finished product 12 can be provided with flanges.

[0091] For example, the inner ring of the first semi-finished product 11 has a first flange 17a, and the inner ring of the second semi-finished product 12 has a second flange 17b. The first flange 17a and the second flange 17b are respectively provided with a first connecting portion 15, and the first connecting portion 15 includes a first through hole. The outer ring of the first semi-finished product 11 has a third flange 18a, and the outer ring of the second semi-finished product 12 has a fourth flange 18b. The third flange 18a and the fourth flange 18b are respectively provided with a second connecting portion, and the second connecting portion includes a second through hole. The first molded part 13 is formed between the opposing sides of the first flange 17a and the second flange 17b, and has a first engaging portion filled in the first through hole. The second molded part 14 is formed between the opposing sides of the third flange 18a and the fourth flange 18b, and has a second engaging portion filled in the second through hole.

[0092] In the embodiments of this application, the flange widths of the first flange 17a, the second flange 17b, the third flange 18a, and the fourth flange 18b can be limited, and the flange widths of the first flange 17a and the second flange 17b can be limited to be similar or equal, the flange widths of the third flange 18a and the fourth flange 18b can be similar or equal, and the dimensions of the first connecting portion 15 and the second connecting portion can be limited respectively to ensure that the corresponding shear force meets the requirements. The flanged design facilitates demolding, ensuring stability and reliability of the demolding process to a certain extent. It also improves the alignment accuracy of the first semi-finished product 11 and the second semi-finished product 12, preventing deformation of the injection-molded product 10 due to shrinkage during position transfer driven by the rotating core and turntable mechanisms 200. This ensures the sealing effect and sealing area of ​​the connection region between the first and second semi-finished products 11 and 12, improving the shape accuracy and sealing quality of the injection-molded product 10. Furthermore, it prevents molten plastic from entering the cavity between the first and second semi-finished products 11 and 12 during injection molding of the first and second molded parts 13 and 14, further optimizing processing quality and effect. Thus, it not only ensures the integrity of the product (i.e., the injection-molded product 10) and effectively solves quality problems caused by insufficient positioning accuracy or poor sealing, but also reduces positioning errors caused by complex assembly methods, significantly improving positioning accuracy, shortening the cycle time, and enhancing overall processing efficiency.

[0093] It should be noted that the first connecting part 15 may also include a first connecting blind hole. The number of the first connecting blind hole and the first through hole can be set to multiple. The first connecting blind hole and the first through hole can be alternately set. One or more first connecting blind holes can be set between adjacent first through holes. The second connecting part may also include a second connecting blind hole. The second connecting blind hole and the second through hole can be set correspondingly without further explanation.

[0094] For example, the inner ring of the first semi-finished product 11 has a first flange 17a, and the outer surface of the first semi-finished product 11 is provided with a first blind hole 16a corresponding to the position of the first flange 17a. That is, the first flange 17a faces the first molding cavity 111 and is provided with a first blind hole 16a. At the moment of mold opening, the ejector of the first mold core 141 moves synchronously, driving the first semi-finished product 11, which is formed in the first semi-finished product cavity 151, to be ejected from the first mold core 141 to the first molding cavity 111. This makes the first semi-finished product 11 relatively stationary during the separation process and remain in the first molding cavity 111. The clamping force generated by the contraction of the first blind hole 16a prevents it from falling off during subsequent rotation, thereby allowing the first semi-finished product 11 to be stably placed in the first molding cavity 111 and not fall off the first molding cavity 111 due to gravity. The first blind hole 16a does not participate in the secondary injection molding and is only used for anti-sticking, anti-deformation and precise positioning; its position strictly corresponds to the target mold retention side (first molding cavity 111). The outer ring of the first semi-finished product 11 has a third flange 18a, and the third flange 18a may also have a second blind hole 16b. The relevant description of the third molding cavity 112 can be referred to accordingly, and the specific implementation of the second semi-finished product 12 remaining in the second molding cavity 131 or the fourth molding cavity 132 can be referred to the aforementioned relevant description of the first semi-finished product 11 remaining in the first molding cavity 111 or the third molding cavity 112, which will not be repeated here.

[0095] When the first molding cavity 111 carrying the first semi-finished product 11 and the second molding cavity 131 carrying the second semi-finished product 12 cooperate to form the injection molded product 10 cavity, the gap between the first semi-finished product 11 and the second semi-finished product 12 is completely filled during the secondary injection molding, achieving a physical interlocking connection between the inner and outer rings. For example... Figure 4 As shown, this application can set the first semi-finished product 11 as the upper half ring and the second semi-finished product 12 as the lower half ring. The height of the lower half ring is higher than that of the upper half ring, that is, the height of the second semi-finished product 12 is higher than that of the first semi-finished product 11 (i.e., H1 > H2). The inner ring of the second semi-finished product 12 has a stronger clamping force, and when the mold is opened, it will naturally pull down the first semi-finished product 11 and separate it from the front mold (first molding cavity 111, third molding cavity 112) as a whole. In addition, the outer periphery of the second semi-finished product 12 is provided with a connecting part (such as... Figure 8 As shown at point A), the connectors in the second molding cavity 131 or the fourth molding cavity 132 are inserted. At the moment of mold opening, the stronger clamping force of the inner ring of the second semi-finished product 12 and the positioning effect of the insertion are used to keep the second semi-finished product 12 in the second molding cavity 131 or the fourth molding cavity 132. At the moment of demolding of the injection molded product cavity, the insertion positioning relationship is simultaneously released, allowing the injection molded product 10 to be removed.

[0096] In related technologies, semi-finished products are first injection molded using an injection molding machine, and then manually transported to the hot plate welding station. During the hot plate welding process, the joints of the semi-finished products are heated to a molten temperature using a hot plate, then pressed together, cooled, and solidified to form a hollow, integral product. This processing involves multiple process changes: including two independent injection molding cycles, manual or mechanical handling, and operation with specialized welding equipment. It requires at least two injection molding machines, two sets of molds, and additional welding fixtures. The entire process involves many steps, dispersed actions, and significant manual intervention, resulting in low production efficiency, poor process stability, large equipment and space requirements, and high overall manufacturing costs.

[0097] like Figure 1 , Figure 2 , Figure 3As shown in the embodiments of this application, the turnover and welding operations that were originally completed outside the mold are all integrated into the injection molding system. The drive mechanism 200 of the injection molding system can drive the first molding part 110 and the third molding part 130 to rotate, so that the first molding part 110 and the fourth molding part 140 cooperate to form the first semi-finished product cavity 151, the second molding part 120 and the third molding part 130 cooperate to form the second semi-finished product cavity 152, and the first molding part 110 and the third molding part 130 cooperate to form the injection molded finished product cavity 153. The injection unit 300 synchronously supplies materials to the first semi-finished product cavity 151, the second semi-finished product cavity 152, and the injection molded product cavity 153, so that the first semi-finished product cavity 151 is formed into the first semi-finished product 11, the second semi-finished product cavity 152 is formed into the second semi-finished product 12, and the injection molded product cavity 153 is formed into the injection molded product 10. Thus, in each injection cycle, the first semi-finished product 11 and the second semi-finished product 12 are formed, the semi-finished products are transferred, the first semi-finished product 11 and the second semi-finished product 12 formed in the previous cycle are docked, and the injection molded product 10 is formed. Instead of separately molding the first semi-finished product 11 and the second semi-finished product 12 before handling and welding, the mold, in a single mold-closed state, simultaneously injects the first semi-finished product cavity 151, the second semi-finished product cavity 152, and the injection-molded product cavity 153 formed by the cooperation of each molding part. Thus, the first semi-finished product 11 is formed in the first semi-finished product cavity 151, and the second semi-finished product 12 is formed in the second semi-finished product cavity 152. The first semi-finished product 11, which was left on the first molding part 110 after the first molding of the first semi-finished product cavity 151, and the second semi-finished product 12, which was left on the third molding part 130 after the first molding of the second semi-finished product cavity 152, are simultaneously formed into the first molded part 13 in the inner ring of the first semi-finished product 11 and the second molded part 14 in the outer ring of the first semi-finished product 11 and the second semi-finished product 12 through secondary injection molding. The first semi-finished product 11 and the second semi-finished product 12 are then fused together to form a complete hollow ring product, thus forming the final injection-molded product 10. The main material of the injection molding cavity 153 used to form the first molded part 13 and the second molded part 14 can melt the joint position of the first semi-finished product 11 left on the first molding part 110 after the first semi-finished product cavity 151 and the second semi-finished product 12 left on the third molding part 130 after the second semi-finished product cavity 152 after the first molding, and naturally fuse into one piece after cooling to form the injection molded product 10.

[0098] To achieve the integrated molding of the above structure, for example, the injection molding system of this application can use an injection molding machine, a mold and a hot runner system inside the mold. The mold is equipped with the aforementioned first molding part 110, second molding part 120, third molding part 130 and fourth molding part 140, and the aforementioned injection assembly 300 is configured through the hot runner system. Thus, the injection molding of the first semi-finished product 11, the second semi-finished product 12, the first molded part 13 and the second molded part 14 are completed simultaneously. The high-temperature plastic melt during the injection of the first molded part 13 and the second molded part 14 is used to melt and then solidify the contact area of ​​the first semi-finished product 11 and the second semi-finished product 12, which are solidified first, and finally achieve the sealing effect of the injection molded product 10, resulting in a hollow injection molded product 10.

[0099] like Figure 4 , Figure 5 As shown, the drive assembly of the injection molding system can drive the first molding section 110 and the third molding section 130 to rotate, so that the first molding section 110 and the fourth molding section 140 cooperate to form the first semi-finished product cavity 151, the second molding section 120 and the third molding section 130 cooperate to form the second semi-finished product cavity 152, and the first molding section 110 and the third molding section 130 cooperate to form the injection molded finished product cavity 153. The mold can be equipped with a first semi-finished product station, a second semi-finished product station, and a finished product station corresponding to the first semi-finished product cavity 151, the second semi-finished product cavity 152, and the injection molded finished product cavity 153, respectively. The molding of the first semi-finished product 11, the molding of the second semi-finished product 12, and the molding of the injection molded finished product 10 are performed in parallel at the same stage. By controlling the switching and coordination of the four molding parts through the drive mechanism, the first semi-finished product 11 and the second semi-finished product 12 are reserved in the corresponding molding parts and the injection molded finished product 10 for secondary injection molding in a continuous cycle. During the continuous cycle processing, the finished product station ejects the injection molded finished product 10 after the mold is opened, so that the first molding part 110 and the third molding part 130 located at the finished product station return to the unloaded state, and then rotate into the semi-finished product station corresponding to the next cycle under the drive of the drive component.

[0100] For example, a complete cycle consists of six consecutive steps, and the specific processing flow is as follows: like Figure 9 As shown, in step one: in the mold-closed state, the first injection section 310, the second injection section 320, and the third injection section 330 simultaneously inject through the hot channel of the heating device 340. The first semi-finished product cavity 151 forms the first semi-finished product 11, the second semi-finished product cavity 152 forms the second semi-finished product 12, and the first molded part 13 and the second molded part 14 are formed in the injection molded product cavity 153. The reserved first semi-finished product 11 and second semi-finished product 12 are melted and solidified again by the high temperature melt during injection, thereby jointly forming a hollow and sealed injection molded product 10. like Figure 10As shown, step two: mold opening. During the mold opening process, the first mold core ejector 142 and the second mold core ejector 122 move synchronously, so that the first semi-finished product 11 remains on the molding cavity corresponding to the first molding part 110 and the second semi-finished product 12 remains on the molding cavity corresponding to the third molding part 130. like Figure 11 As shown, step three: the mold continues to open, making room for the robot arm to pick up the part of the injection-molded finished product 10 that has been sealed at the finished product station; like Figure 12 As shown, in step four: after the injection molded product 10 formed by the injection molded product cavity 153 is removed, the first mold core 141 is ejected and the limit is released; like Figure 13 As shown, in step five: the first driving component 210 drives the first molding part 110 to rotate 180°, thereby exchanging the positions of the first molding cavity 111 and the third molding cavity 112, which is used to transfer the molding cavity containing the first semi-finished product 11 to the finished product station; the second driving component 220 drives the third molding part 130 to rotate 180°, thereby exchanging the positions of the second molding cavity 131 and the fourth molding cavity 132, which is used to transfer the molding cavity containing the second semi-finished product 12 to the finished product station, so that the first semi-finished product 11 reserved in the first molding part 110 and the second semi-finished product 12 reserved in the third molding part 130 are precisely aligned; like Figure 14 As shown, in step six: the first mold core 141 and the first mold core ejector 142 are reset. At this point, preparation for a new cycle is complete. After the mold is closed, the aforementioned steps are repeated to repeatedly injection mold the first semi-finished product 11, the second semi-finished product 12, and complete the molding of the next injection molded product 10. The entire process requires no external handling, secondary heating, or manual intervention; it is all automatically completed by the internal mechanism of the mold.

[0101] In some embodiments, the first molded part 13, the second molded part 14, the first semi-finished product 11, and the second semi-finished product 12 can be made of the same material, such as PP (polypropylene) or other materials suitable for actual processing, and the melting point of each part can be kept consistent during processing.

[0102] In addition, when injection molding the first molded part 13 and the second molded part 14, the plasticizing temperature can be increased by about 10°C (or other set temperatures). This, combined with the shear heat generated when the melt flows through the gate, ensures that the temperature of the material actually entering the injection molded cavity 153 through the inner and outer ring positions is much higher than the melting points of the first semi-finished product 11 and the second semi-finished product 12. Unlike traditional hot plate welding, which relies on an external hot plate to preheat the mating surfaces of the first semi-finished product 11 and the second semi-finished product 12, and which requires significant adjustments to the mold and product if hot plate welding is eliminated, the embodiments of this application use the melt heat of the first molded part 13 and the second molded part 14 themselves as the heat source. This eliminates the need for an independent welding station and hot plate device, simplifying the injection molding system configuration and reducing system modifications, while producing a hollow, sealed injection molded product 10. In this embodiment, when the high-temperature melt of the first molded part 13 and the second molded part 14 fills the finished product station, it directly contacts the solidified surfaces of the first semi-finished product 11 and the second semi-finished product 12, causing localized melting of the contact area of ​​the first semi-finished product 11 and the second semi-finished product 12 by its own heat. Subsequently, during the mold cooling process, the molten interface re-solidifies, and the first molded part 13 and the second molded part 14 fuse with the first semi-finished product 11 and the second semi-finished product 12. The first molded part 13, through heating and melting, fills the gap between the inner ring of the first semi-finished product 11 and the inner ring of the second semi-finished product 12, and fills the first connecting part 15 of the inner ring with residual heat. This allows for the formation of a first engagement portion that directly engages with the first connecting portion 15 of the first semi-finished product 11 and the first connecting portion 15 of the second semi-finished product 12 after curing. The second molded part 14 is heated and melted to fill the gap between the outer ring of the first semi-finished product 11 and the outer ring of the second semi-finished product 12, and the second connecting portion of the outer ring is filled with residual heat. This allows for the formation of a second engagement portion that directly engages with the second connecting portion of the first semi-finished product 11 and the second connecting portion of the second semi-finished product 12 after curing. The engagement connection structure can improve the structural strength of the component sealing area, thereby producing an annular hollow seal injection molded product 10.

[0103] In the embodiments of this application, the final injection-molded product 10 is a completely fused whole, rather than a mechanical assembly of separate parts. Although the first semi-finished product 11, the second semi-finished product 12, the first molded part 13, and the second molded part 14 are sequentially molded in the mold, after the first molded part 13 and the second molded part 14 are injected, their high-temperature melt has melted and re-solidified the boundary between the contact area of ​​the first semi-finished product 11 and the second semi-finished product 12, and there is no clear material boundary line or gap in between; therefore, when the actual molded injection-molded product 10 is cut open for display, no obvious layered boundary is visible, and what is presented is a continuous, dense, hollow, and sealed single component (such as...). Figure 4(As shown). Its mechanical properties, airtightness, and structural integrity are all equivalent to those of a part formed by injection molding in one step; in other words, the first semi-finished product 11 and the second semi-finished product 12 are no longer independent semi-finished products, but together become an inseparable part of the injection-molded finished product 10 through the hot-melt connection of the first molding part 13 and the second molding part 14, the tight engagement of the first molding part 13 with the first semi-finished product 11 and the second semi-finished product 12, and the tight engagement of the second molding part 14 with the first semi-finished product 11 and the second semi-finished product 12.

[0104] The in-mold hollow sealing molding solution of this application differs from related technologies. The resulting injection-molded product 10 has no overflow, a beautiful shape, and higher applicability. It also exhibits high bonding strength and excellent product shape accuracy. The melt can flow into complex structures such as deep cavities, curved surfaces, irregular corners, and internal channels, enabling welding and sealing of areas difficult to reach with traditional welding methods such as ultrasonic welding and hot plate welding. No additional structures such as snap-fit ​​grooves, sealing grooves, or screw holes are required for connection or sealing. This application's embodiment only requires one set of molds, one set of hot runners, and one injection molding machine (such as a single-color injection molding machine). The sealing of the hollow part can be achieved through injection molding, resulting in low hardware investment costs. It eliminates the need for matching with two-color injection molding, modifying a single-color injection molding machine, or using hot plate welding or robotic arms. The process is simple, and the injection molding machine's mold opening and closing actions are easy to operate, eliminating the need for secondary mold opening and closing. Simultaneously, the second drive component can be a moving mold turntable drive component, eliminating the need to rotate after ejecting the product. This makes the product more stable during movement and less prone to falling off, effectively improving the success rate of the hollow injection-molded product 10. Furthermore, the mold can simultaneously complete the injection molding of the first semi-finished product 11, the second semi-finished product 12, and the injection-molded finished product 10, achieving simultaneous component molding and sealing, significantly shortening the production cycle and greatly improving production efficiency. The injection molding system and injection molding control method of this application have a wide range of applications, not only suitable for processing hollow products, but also applicable to the connection of non-hollow products and the comprehensive sealing of non-ring products.

[0105] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. An injection molding system, characterized in that, include: First molding section, second molding section, third molding section, fourth molding section, drive mechanism and injection assembly; The driving mechanism can drive the first molding part and the third molding part to rotate, so that the first molding part and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the third molding part cooperate to form a second semi-finished product cavity, and the first molding part and the third molding part cooperate to form an injection molded finished product cavity. The injection molding system is configured to cyclically execute a first half-cycle and a second half-cycle. The injection assembly is configured to synchronously feed materials to the first semi-finished product cavity, the second semi-finished product cavity, and the injection finished product cavity, so that in each half-cycle, the first semi-finished product cavity forms a first semi-finished product, the second semi-finished product cavity forms a second semi-finished product, and the injection finished product cavity forms an injection finished product. The injection finished product is a hollow ring, and one of the first semi-finished product and the second semi-finished product is used to construct the upper half-ring and the other is used to construct the lower half-ring. The injection-molded finished product is a first semi-finished product that is left on the first molding part after half of the cavity of the first semi-finished product is formed in a cycle, and a second semi-finished product that is left on the third molding part after half of the cavity of the second semi-finished product is formed in a cycle. Simultaneously, the inner ring of the first semi-finished product and the second semi-finished product is formed into a first molded part, and the outer ring of the first semi-finished product and the second semi-finished product is formed into a second molded part. The first semi-finished inner ring and the second semi-finished inner ring each have a first connecting portion on their facing sides, and the first semi-finished outer ring and the second semi-finished outer ring each have a second connecting portion on their facing sides; the first molded part fills the gap between the first semi-finished inner ring and the second semi-finished inner ring by heating and melting, and is engaged with the first connecting portion of the first semi-finished product and the first connecting portion of the second semi-finished product respectively; the second molded part fills the gap between the first semi-finished outer ring and the second semi-finished outer ring by heating and melting, and is engaged with the second connecting portion of the first semi-finished product and the second connecting portion of the second semi-finished product respectively.

2. The injection molding system as described in claim 1, characterized in that, The driving mechanism includes a first driving component and a second driving component. The first molding part includes a first molding cavity and a third molding cavity. The first driving component is used to drive the first molding cavity and the third molding cavity to rotate. The third molding part includes a second molding cavity and a fourth molding cavity. The second driving component is used to drive the second molding cavity and the fourth molding cavity to rotate. Wherein, the first molding cavity and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the second molding cavity cooperate to form a second semi-finished product cavity, and the third molding cavity and the fourth molding cavity cooperate to form an injection molded finished product cavity; Alternatively, the third molding cavity and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the fourth molding cavity cooperate to form a second semi-finished product cavity, and the first molding cavity and the second molding cavity cooperate to form an injection-molded finished product cavity.

3. The injection molding system as described in claim 2, characterized in that, The first semi-finished product cavity, the second semi-finished product cavity, and the injection molded product cavity formed by their mutual cooperation are arranged along a first direction, and the injection molded product cavity is located between the first semi-finished product cavity and the second semi-finished product cavity; The first drive assembly is configured to rotate 180° before each half-cycle injection molding to drive the first molding cavity and the third molding cavity to rotate; the second drive assembly is configured to rotate 180° before each half-cycle injection molding to drive the second molding cavity and the fourth molding cavity to rotate.

4. The injection molding system as described in claim 2, characterized in that, The injection molding system includes a base and a frame arranged opposite each other in the vertical direction. The first molding part, the second molding part, and the first drive assembly are disposed on the frame, and the third molding part, the fourth molding part, and the second drive assembly are disposed on the base. The frame is configured to move closer to the base before each half-cycle of injection molding to perform a mold closing action; and to move away from the base after each half-cycle of injection molding to perform a mold opening action.

5. The injection molding system as described in claim 4, characterized in that, The fourth molding part includes a first mold core and a first mold core ejector; The first mold core ejector is located on the side of the first mold core away from the frame and is configured to drive the first semi-finished product formed in the first semi-finished product cavity to be ejected from the first mold core to the first molding cavity or to the third molding cavity when the frame performs the mold opening action.

6. The injection molding system as described in claim 4, characterized in that, The second molding part includes a second mold core and a second mold core ejector. The second mold core ejector is located on the side of the second mold core away from the machine base, and is configured to drive the second semi-finished product formed in the second semi-finished product cavity to be ejected from the second mold core to the second molding cavity or to the fourth molding cavity when the machine frame performs the mold opening action.

7. The injection molding system according to any one of claims 1 to 6, characterized in that, The injection assembly includes a first injection section, a second injection section, a third injection section, and a heating device for heating the first injection section, the second injection section, and the third injection section; The first injection part is inserted through the first molding part and is used to supply material to the first semi-finished product cavity formed by the cooperation of the first molding part and the fourth molding part. The second injection part is inserted through the second molding part and is used to supply material to the second semi-finished product cavity formed by the cooperation of the second molding part and the third molding part; The third injection section is inserted through the first molding section and is used to supply material to the injection molded cavity formed by the cooperation of the first molding section and the third molding section.

8. The injection molding system as described in claim 7, characterized in that, The third injection section includes a first sub-injection section and a second sub-injection section. The first sub-injection section is used to supply material to the inner ring of the injection molded product cavity, and the second sub-injection section is used to supply material to the outer ring of the injection molded product cavity, so as to perform secondary injection molding on the first semi-finished product reserved on the first molding section after half of the first semi-finished product cavity is formed in the first half cycle, and the second semi-finished product reserved on the third molding section after half of the second semi-finished product cavity is formed in the second half cycle. Simultaneously, the inner ring of the first semi-finished product and the second semi-finished product is formed into a first molded part, and the outer ring of the first semi-finished product and the second semi-finished product is formed into a second molded part.

9. A method for controlling injection molding, characterized in that, An injection molding system as described in any one of claims 1 to 8, wherein the injection molding system is configured to cyclically execute a first half-cycle and a second half-cycle; The injection molding control method includes: The control drive mechanism is operated so that the first molding part and the fourth molding part cooperate to form the first semi-finished product cavity, the second molding part and the third molding part cooperate to form the second semi-finished product cavity, and the first molding part and the third molding part cooperate to form the injection molded finished product cavity; The injection assembly is controlled to synchronously produce the first semi-finished product from the first semi-finished product cavity, the second semi-finished product from the second semi-finished product cavity, and the injection molded product from the injection finished product cavity in each half cycle.

10. The injection molding control method as described in claim 9, characterized in that, The driving mechanism includes a first driving component and a second driving component. The first molding part includes a first molding cavity and a third molding cavity. The third molding part includes a second molding cavity and a fourth molding cavity. Controlling the driving mechanism to operate so that the first molding part and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the third molding part cooperate to form a second semi-finished product cavity, and the first molding part and the third molding part cooperate to form an injection-molded finished product cavity includes: In the first half-cycle, the first driving component and the second driving component are controlled to work, so that the first molding cavity and the fourth molding part cooperate to form a first semi-finished product cavity, the second molding part and the second molding cavity cooperate to form a second semi-finished product cavity, and the third molding cavity and the fourth molding cavity cooperate to form an injection molded finished product cavity; In the second half-cycle, the first driving component and the second driving component are controlled to work, so that the third molding cavity and the fourth molding part cooperate to form the first semi-finished product cavity, the second molding part and the fourth molding cavity cooperate to form the second semi-finished product cavity, and the first molding cavity and the second molding cavity cooperate to form the injection molded finished product cavity.

11. The injection molding control method as described in claim 10, characterized in that, The injection molding system includes a base and a frame arranged opposite each other in the vertical direction. The first molding part, the second molding part, and the first drive assembly are disposed on the frame, and the third molding part, the fourth molding part, and the second drive assembly are disposed on the base. The injection molding control method further includes: Before each half-cycle injection molding, the control frame moves closer to the base to perform the mold closing action; After each half-cycle of injection molding is performed, the control frame moves away from the base to perform the mold opening action.

12. A finished injection-molded product, characterized in that, The injection-molded product is manufactured using the injection molding control method as described in any one of claims 9 to 11, and comprises: The first semi-finished product and the second semi-finished product are connected and set together. One of the first semi-finished product and the second semi-finished product is used to construct an upper half ring and the other is used to construct a lower half ring. The inner ring of the first semi-finished product and the inner ring of the second semi-finished product have a first connecting part on the facing side, and the outer ring of the first semi-finished product and the outer ring of the second semi-finished product have a second connecting part on the facing side. The first molded part is formed on the inner ring of the first semi-finished product and the second semi-finished product, and is respectively engaged with the first connecting part of the first semi-finished product and the first connecting part of the second semi-finished product. The second molded part is formed on the outer ring of the first semi-finished product and the second semi-finished product, and is engaged with the second connecting part of the first semi-finished product and the second connecting part of the second semi-finished product, respectively.

13. The injection-molded finished product as described in claim 12, characterized in that, The first semi-finished inner ring has a first flange and the second semi-finished inner ring has a second flange. The first flange and the second flange are respectively provided with the first connecting part, and the first connecting part includes a first through hole. The first semi-finished product outer ring has a third flange and the second semi-finished product outer ring has a fourth flange. The third flange and the fourth flange are respectively provided with a second connecting part, and the second connecting part includes a second through hole. The first molded part is formed between the opposing sides of the first flange and the second flange, and has a first engaging portion filled in the first through hole; the second molded part is formed between the opposing sides of the third flange and the fourth flange, and has a second engaging portion filled in the second through hole.

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