Hot runner system of multi-station mold

Abstract

The invention provides a hot runner system of a multi-station mold, and belongs to the technical field of molds. The multi-station mold solves the problems that an existing multi-station mold is low in injection molding efficiency and poor in quality. The hot runner system of the multi-station mold comprises a movable mold and a fixed mold, the movable mold is connected with a rotating motor, a motor shaft of the rotating motor is connected with a rotating disc, the movable mold is provided with a plurality of movable mold inserts, and the movable mold inserts are evenly distributed in the circumferential direction. The fixed mold and the corresponding movable mold insert are assembled to form at least three forming cavities and a finished product cavity of the last station, and the hot runner system comprises a hot runner structure I and a hot runner structure II which are arranged on the fixed mold, and a hot runner structure III arranged on the movable mold, the first hot runner structure comprises a first hot runner formed in the fixed mold and a first guide plate communicating with an outlet of the first hot runner, and the first guide plate is provided with a plurality of runner outlets. According to the hot runner system of the multi-station mold, the molding quality of a product can be improved while the injection molding efficiency and stability are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a hot runner system of a multi-station mold. Background Art

[0002] When thick-walled products are produced, if one-time injection molding is used, the problem of cooling shrinkage after injection molding needs to be considered. Therefore, multi-station injection molding is usually adopted during production, and multiple injection molding is usually used to achieve gradual injection molding and reduce shrinkage.

[0003] Thick-walled products of this application, such as Figure 1 As shown, it includes a strip-shaped embryo 1, the upper surface of the embryo 1 is sequentially injection-molded with an injection layer 3 12, an injection layer 5 14 and an injection layer 6 15, and the lower surface of the embryo 1 is sequentially injection-molded with an injection layer 2 11, an injection layer 4 13 and an injection layer 7 16.

[0004] For example, Chinese patent application [authorization announcement number: CN111775401B] discloses a multi-station layered injection molding thick-walled lens injection mold, including a first station for performing one-time injection molding, a third station for performing two-time injection molding, a fifth station for performing three-time injection molding, a second and fourth stations for cooling, and a sixth station for demolding. An intermediate rotating plate is provided between the fixed mold and the movable mold of the injection mold. The rotating intermediate rotating plate drives the product formed by injection molding at the first station to the subsequent second to sixth stations until the product is demolded. The fixed mold includes a fixed mold cavity I, a fixed mold cavity II, and a fixed mold cavity III. A product-shaped air blowing cooling device is provided between the fixed mold cavity I and the fixed mold cavity II, and between the fixed mold cavity II and the fixed mold cavity III. The fixed mold cavity I, the fixed mold cavity II, and the fixed mold cavity III correspond to the first, third, and fifth stations respectively. Two air blowing cooling devices correspond to the second and fourth stations respectively. A demolding port is also provided on the fixed mold corresponding to the sixth station. The mold includes a movable mold cavity I, a movable mold cavity II and a movable mold cavity III. A product-shaped air blowing cooling device is provided between the movable mold cavity I and the movable mold cavity II, between the movable mold cavity II and the movable mold cavity III, and between the movable mold cavity III and the movable mold cavity I. The movable mold cavity I, the movable mold cavity II and the movable mold cavity III correspond to the first, third and fifth stations respectively. The three air blowing cooling devices correspond to the second, fourth and sixth stations respectively. The middle turntable includes six intermediate cavities with the same structure corresponding to the upper cavities of the fixed mold and the movable mold, corresponding to the first to sixth stations respectively. The fixed mold cavity I, the intermediate cavity and the movable mold cavity I constitute the primary molding cavity of the product. The intermediate cavity containing the primary mold of the product formed after the first injection is cooled and rotated between the fixed mold cavity II and the movable mold cavity II. The mold is closed to form a secondary molding cavity wrapped on both sides of the product primary mold. The intermediate cavity containing the secondary mold of the product formed after the secondary injection is cooled and rotated between the fixed mold cavity III and the fixed mold cavity III. The mold is closed to form a tertiary molding cavity wrapped on both sides of the secondary mold of the product.

[0005] The above structure realizes three-times injection molding of both ends of the product by setting the first, third and fifth stations, realizes cooling of the semi-finished product after the first two injection moldings at the second and fourth stations, and then realizes demolding of the product after the fifth molding through the sixth station. However, when molding at the first, third and fifth stations, both ends of the product are injection molded, and the hardness of the semi-finished product in the initial state is relatively low. If injection molding is adopted at both ends of the semi-finished product, it is easy to cause a lack of stable supporting force during the injection molding process, resulting in the molded semi-finished product or product being easily deformed, affecting the quality of the product. In addition, during injection molding, the above structure is injection molded by separately setting a corresponding hot runner structure. During injection molding, the injection nozzle needs to be continuously switched, which reduces the injection molding efficiency. Summary of the Invention

[0006] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a hot runner system for a multi-station mold. The technical problem to be solved by the present invention is to solve the problem of low injection efficiency and poor quality of the existing multi-station mold.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A hot runner system for a multi-station mold comprises a movable mold and a fixed mold, the movable mold being connected to a rotating motor, the motor shaft of the rotating motor being connected to a rotating disk, the movable mold being provided with a plurality of movable mold inserts, the plurality of movable mold inserts being evenly distributed along the circumferential direction, the fixed mold and the corresponding movable mold inserts being combined to form at least three molding cavities and a finished product cavity of the last station, characterized in that the hot runner system comprises a hot runner structure 1 and a hot runner structure 2 arranged on the fixed mold, and a hot runner structure 3 arranged on the movable mold, the hot runner structure 1 comprising a hot runner 1 opened on the fixed mold and a guide plate 1 connected to the outlet of the hot runner 1, the guide plate 1 having a plurality of runner outlets, the runner outlets being respectively connected to the corresponding molding cavities, the hot runner structure 2 comprising a hot runner 2 opened on the fixed mold, the hot runner structure 3 comprising a hot runner 3 opened on the movable mold, the hot runner 2 and the hot runner 3 being respectively located at both ends of the finished product cavity, and the outlet of the hot runner 2 and the outlet of the hot runner 3 being respectively connected to the finished product cavity.

[0009] During injection molding, the movable mold and the fixed mold are first closed, and then the raw material is injected into the molding cavity of the first station. The raw material flows out from the hot runner outlet of the hot runner structure one, flows through the guide plate one, and flows into the molding cavity of the first station from the corresponding flow channel outlet of the guide plate one, thereby realizing the injection molding of the embryo. After molding, the movable mold and the fixed mold are opened. After the mold is opened, the embryo is driven to rotate by the rotating disk of the rotating motor, rotated to the molding cavity of the second station, and the movable mold and the fixed mold are closed for the second time. After closing the mold, the raw material still flows out from the hot runner outlet of the hot runner structure one, flows through the guide plate one, and flows into the molding cavity of the second station from the corresponding flow channel outlet of the guide plate one, thereby realizing the injection molding of the embryo with the injection molding layer two. Since one end face of the embryo is subjected to injection molding, the injection molding process is repeated. The process makes the end of the other end of the embryo abut against the wall of the molding cavity, thereby realizing the positioning of one end of the embryo, ensuring the stability of the semi-finished product when it is injected in the second station, and injection molding is carried out in sequence according to the above method until the semi-finished product is placed in the finished product cavity. By synchronously flowing the raw materials from the hot runner structure two and the hot runner structure three, the raw materials flow from the hot runner two and the hot runner three into the two ends of the molding cavity, thereby realizing the processing of both ends of the semi-finished product, thereby ensuring the consistency of the upper and lower ends of the outer surface of the product, and because the semi-finished product is processed multiple times between the last station, the thickness of the semi-finished product is continuously increased, so that the semi-finished product can withstand a larger impact force, and does not need to be processed by positioning one end, thereby improving the efficiency of the injection molding process.

[0010] This solution is to achieve rapid processing of the semi-finished products of the first few stations by injecting raw materials into all molding cavities through hot runner structure 1, and adopt a single end face injection molding method to facilitate the shaping and cooling of the semi-finished products, while the semi-finished products of the finished cavity are injected by two end faces. On the one hand, the semi-finished products have a certain thickness after multiple injection molding processes, and can be injection molded by two end faces without deformation. On the other hand, the outer surface of the product needs to maintain a high degree of consistency, so the quality of the outer surface of the product after injection molding is improved by simultaneous injection molding of the two end faces. Therefore, for the above-mentioned molding structure, this application adopts a hot runner structure 1 to realize the injection of raw materials into the semi-finished products of the first few stations, and adopts hot runner structure 2 and hot runner structure 3 to realize the injection of raw materials into the semi-finished products of the last station, which can improve the molding quality of the product while improving the injection molding efficiency and stability.

[0011] In the hot runner system of the multi-station mold, the second hot runner and the corresponding third hot runner are symmetrically arranged along the mold opening direction.

[0012] By symmetrically arranging them along the mold opening direction, it is ensured that hot runners 2 and 3 can simultaneously enter the finished product cavity of the last station when the raw materials are injected, thereby improving the molding quality of the product's outer surface.

[0013] In the hot runner system of the above-mentioned multi-station mold, a guide plate 2 is provided on the hot runner structure 2, and a guide plate 3 is provided on the hot runner structure. The above-mentioned hot runner 2 is opened in the guide plate 2, and the above-mentioned hot runner 3 is opened in the guide plate 3. The hot runner 2 and the hot runner 3 are both arranged perpendicular to the mold opening direction.

[0014] By setting hot runner two and hot runner three perpendicular to the mold opening direction, the speed at which the fluid enters the finished product cavity of the last station is reduced, thereby reducing the impact on the semi-finished product in the finished product cavity, making the product molding more stable. While reducing the flow rate, it also reduces the impact of the fluid on hot runner two and hot runner three, ensuring that the speed is reduced without consuming too much heat energy in the fluid, thereby improving the stability of injection molding.

[0015] In the hot runner system of the above-mentioned multi-station mold, a diversion channel is provided on the guide plate 1, and the middle part of the diversion channel is radially dispersed outward to form a plurality of diversion branches connected to the molding cavity. The outlet of the diversion branch is the above-mentioned runner outlet, and the outlet of the hot runner 1 is connected to the middle part of the diversion channel.

[0016] The diversion channel adopts a ray dispersion method, so that the speed of the fluid flowing out of the guide plate 1 into each corresponding molding cavity is roughly the same, avoiding a large impact on the semi-finished product in the molding cavity, improving the stability of the molding, and directly connecting the outlet of the hot runner 1 with the middle of the diversion channel to ensure that the speed of the fluid flowing out of multiple runner outlets is roughly the same, thereby improving the stability of product molding.

[0017] In the hot runner system of the multi-station mold, the branch flow path is arranged perpendicular to the mold opening direction.

[0018] The arrangement of this structure enables the diversion branch to also play a buffering role, slowing down the flow rate of the fluid, thereby reducing the impact force on the semi-finished product and improving the stability and quality of injection molding.

[0019] In the hot runner system of the above-mentioned multi-station mold, a main nozzle is provided in the fixed mold, one end of the main nozzle is connected to the main shooting plate, the hot runner 1 is opened on the main shooting plate, the hot runner structure 1 also includes a buffer plate connected to the main shooting plate at one end, the other end of the buffer plate is connected to the guide plate 1, the outlet of the hot runner 1 is connected to the buffer plate along the mold opening direction, and a buffer flow channel is opened in the buffer plate along the direction perpendicular to the mold opening, and the buffer flow channel is connected to the middle part of the guide plate 1.

[0020] By setting the buffer plate, the fluid entering the main shooting plate from the main nozzle first flows through the buffer plate. The buffer flow channel in the buffer plate is also opened along the vertical mold opening direction. Therefore, the fluid is buffered for the first time in the buffer flow channel, and then flows from the buffer flow channel to the middle part of the guide plate 1, and is buffered for the second time in the diversion channel. This realizes multiple buffering and deceleration of the fluid, reduces the impact on the semi-finished product in the molding cavity, and improves the stability and quality of product molding.

[0021] In the hot runner system of the multi-station mold, the buffer plate is located on the side of the guide plate 1 and the main shooting plate away from the molding cavity.

[0022] With this structural setting, the buffer plate can further increase the buffering effect, while also making it easier for the guide plate to introduce the fluid into the molding cavity and increase the fluid path, thereby reducing the flow rate of the fluid and improving the quality of product molding.

[0023] In the hot runner system of the multi-station mold, all the molding cavities are evenly distributed along the circumference of the rotating disk, and the connection between the buffer plate and the guide plate 1 is arranged along the direction close to the central axis of the rotating disk.

[0024] Since the forming cavities are evenly distributed along the circumference of the rotating disk, the connection between the buffer plate and the guide plate 1 is arranged along the direction close to the motor shaft axis of the rotating motor, so that the connection is as close to the center of the rotating disk as possible, so that the fluid entering the guide plate 1 can flow out from each flow channel outlet at roughly the same speed, thereby improving the stability of the corresponding forming cavities of the guide plate pair when draining.

[0025] In the hot runner system of the above-mentioned multi-station mold, the fixed mold is provided with multiple parallel hot nozzles 1 and at least one hot nozzle 2, and the movable mold is provided with a hot nozzle 3 arranged in a one-to-one correspondence with the hot nozzle 2. The hot nozzle 1, hot nozzle 2 and hot nozzle 3 are all arranged along the mold opening direction, the hot nozzle 1 is arranged between the guide plate 1 and the corresponding molding cavity and connects the two, the hot nozzle 2 is arranged between the guide plate 2 and the finished product cavity and connects the two, the hot nozzle 3 is arranged between the guide plate 3 and the finished product cavity and connects the two, the hot nozzle 2 and the corresponding hot nozzle 3 are respectively located at the two ends of the molding cavity of the last station, and the hot nozzle 2 and the corresponding hot nozzle 3 are coaxially arranged.

[0026] The settings of hot nozzle 1, hot nozzle 2 and hot nozzle 3 enable the buffered fluid to be quickly introduced into the corresponding molding cavity. In order to ensure stable injection of the semi-finished product in the last workstation, hot nozzle 2 and the corresponding hot nozzle 3 are coaxially set to improve the stability of injection molding.

[0027] In the hot runner system of the above-mentioned multi-station mold, there are five molding cavities, the hot runner structure 1 is connected with the five molding cavities and can alternately injection mold the two ends of the semi-finished product, and the hot runner structure 2 and the hot runner structure 3 are connected with the finished product cavity.

[0028] In order to further improve the injection molding quality and cooling efficiency of semi-finished products, the two end faces of the semi-finished products in all molding cavities are alternately injection molded. After one end face of the semi-finished product processed in one station is molded, the end face of the same end will be processed again after one station is separated. This ensures that there is sufficient cooling time after injection molding of both ends of the semi-finished product, thereby improving the injection molding quality of the product.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. By injecting raw materials into all molding cavities through the hot runner structure 1, rapid processing of the semi-finished products of the first few stations is achieved, and a single end face injection molding method is adopted to facilitate the shaping and cooling of the semi-finished products, while the semi-finished products of the finished cavity are injected by two end faces. On the one hand, the semi-finished products have a certain thickness after multiple injection molding processes, and can be injection molded by two end faces without deformation. On the other hand, the outer surface of the product needs to maintain a high degree of consistency, so the quality of the outer surface of the product after injection molding is improved by the simultaneous injection molding of the two end faces. Therefore, for the above-mentioned molding structure, this application adopts a hot runner structure 1 to realize the injection of raw materials into the semi-finished products of the first few stations, and adopts hot runner structures 2 and 3 to realize the injection of raw materials into the semi-finished products of the last station, which can improve the molding quality of the product while improving the injection molding efficiency and stability.

[0031] 2. By alternately injection molding the two end faces of the semi-finished product in the molding cavity, after one end face of the semi-finished product processed in one station is molded, it will be processed again on the end face of the same end after one station is separated, ensuring that there is sufficient cooling time after injection molding of both ends of the semi-finished product, thereby improving the injection molding quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural diagram of the product in this embodiment.

[0033] Figure 2 It is a side view of the present invention.

[0034] Figure 3 yes Figure 2 Cross-sectional view of AA in the figure.

[0035] Figure 4 yes Figure 2 Cross-sectional view of the BB.

[0036] Figure 5 It is a side view of the present invention from another direction.

[0037] Figure 6 yes Figure 5 Cross-sectional view of CC.

[0038] Figure 7 It is a partial structural diagram of the present invention.

[0039] Figure 8 It is a partial structural schematic diagram of hot runner structure 1, hot runner structure 2 and hot runner structure 3 in the present invention.

[0040] Figure 9 It is a front view of the present invention.

[0041] Figure 10 yes Figure 9 Cross-sectional view along DD.

[0042] Figure 11 yes Figure 9 Cross-sectional view along EE.

[0043] Figure 12 It is a partial structural diagram of the hot runner structure 1 in the present invention.

[0044] Figure 13 It is a partial structural diagram of the hot runner structure 2 and the hot runner structure 3 in the present invention.

[0045] In the figure, 1. embryo; 11. Injection molding layer 2; 12. Injection molding layer 3; 13. Injection molding layer 4; 14. Injection molding layer 5; 15. Injection molding layer 6; 16. Injection molding layer 7; 2. movable mold; 21. movable mold insert; 22. Hot nozzle 3; 3. fixed mold; 31. main nozzle; 32. main shot plate; 33. Hot nozzle 1; 34. Hot nozzle 2; 4. rotating motor; 41. rotating disk; 5. molding cavity; 6. hot runner structure 1; 61. hot runner 1; 62. guide plate 1; 62a. runner outlet; 62b. diverter channel; 62c. diverter branch; 63. buffer plate; 63a. buffer runner; 7. hot runner structure 2; 71. hot runner 2; 72. guide plate 2; 8. hot runner structure 3; 81. hot runner 3; 82. guide plate 3; 9. finished product cavity. DETAILED DESCRIPTION

[0046] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0047] like Figure 1-6As shown, the hot runner system of the multi-station mold includes a movable mold 2 and a fixed mold 3. The movable mold 2 is connected to a rotating motor 4, and the motor shaft of the rotating motor 4 is connected to a rotating disk 41. The rotating disk 41 is connected to a plurality of movable mold inserts 21. The plurality of movable mold inserts 21 are evenly distributed along the circumference. The fixed mold 3 and the corresponding movable mold inserts 21 are combined to form at least two molding cavities 5 and a finished product cavity 9 of the last station.

[0048] like Figure 3-8 As shown, in this embodiment, there are five molding cavities 5. The hot runner system includes a hot runner structure 1 6 and a hot runner structure 2 7 provided on the fixed mold 3 and a hot runner structure 3 8 provided on the movable mold 2. The hot runner structure 1 6 includes a hot runner 1 61 provided on the fixed mold 3 and a guide plate 1 62 connected to the outlet of the hot runner 1 61. The guide plate 1 62 has a plurality of flow channel outlets 62a, and the flow channel outlets 62a are respectively connected to the corresponding molding cavities 5. The hot runner structure 2 7 includes a hot runner 1 61 provided on the fixed mold 3 and a guide plate 1 62 connected to the outlet of the hot runner 1 61. The guide plate 1 62 has a plurality of flow channel outlets 62a, and the flow channel outlets 62a are respectively connected to the corresponding molding cavities 5. Hot runner 2 71 on the fixed mold 3, hot runner structure 3 8 includes hot runner 3 81 opened on the movable mold 2, hot runner 2 71 and hot runner 3 81 are respectively located at the two ends of the finished product cavity 9, and the outlet of hot runner 2 71 and the outlet of hot runner 3 81 are respectively connected to the molding cavity 5, hot runner structure 1 6 is connected to the molding cavity 5 of the first five stations and can alternately injection mold the two ends of the semi-finished product, hot runner structure 2 7 and hot runner structure 3 8 are connected to the finished product cavity 9 of the last station.

[0049] During injection molding, first close the movable mold 2 and the fixed mold 3, and then inject the raw material into the molding cavity 5 of the first station. The raw material flows out from the hot runner 161 outlet of the hot runner structure 16, flows through the guide plate 162, and flows into the molding cavity 5 of the first station from the corresponding flow channel outlet 62a of the guide plate 162, so as to realize the injection molding of the embryo 1. After molding, the movable mold 2 and the fixed mold 3 are opened. After the mold is opened, the embryo 1 is driven to rotate by the rotating disk 41 of the rotating motor 4, and is rotated to be placed in the molding cavity 5 of the second station, and the movable mold 2 and the fixed mold 3 are closed for the second time. After closing the mold, the raw material still flows out from the hot flow outlet of the hot runner structure 16, flows through the guide plate 162, and flows into the molding cavity 5 of the second station from the corresponding flow channel outlet 62a of the guide plate 162, so as to realize the injection molding of the embryo 1 with the injection molding layer 2. One end face of the body 1 is processed so that the end of the other end of the embryo 1 is against the cavity wall of the molding cavity 5, thereby realizing the positioning of one end of the embryo 1 and ensuring the stability of the semi-finished product during injection molding at the second station. The semi-finished product is injection molded in sequence according to the above method until it is placed in the finished product cavity 9 of the last station. By making the raw materials flow in synchronously from the hot runner structure 2 7 and the hot runner structure 3 8, the raw materials flow into the two ends of the finished product cavity 9 synchronously from the hot runner 2 71 and the hot runner 3 81, thereby realizing the processing of both ends of the semi-finished product, thereby ensuring the consistency of the upper and lower ends of the outer surface of the product. Moreover, since the semi-finished product is processed multiple times between the last station, the thickness of the semi-finished product is continuously increased, so that the semi-finished product can withstand a larger impact force, and does not need to be processed in a positioning manner at one end, thereby improving the efficiency of the injection molding process.

[0050] This solution is to perform raw material injection molding on the molding cavity 5 on the station before the last station through the hot runner structure 6, thereby realizing rapid processing of the semi-finished products of the first few stations, and adopting a single end face injection molding method to facilitate the shaping and cooling of the semi-finished products, while the semi-finished products in the last station are injected by two end faces. On the one hand, the semi-finished products have a certain thickness after multiple injection molding processes, and can be injection molded by two end faces without deformation. On the other hand, the outer surface of the product needs to maintain a high degree of consistency, so the quality of the outer surface of the product after injection molding is improved by the simultaneous injection molding of the two end faces. Therefore, this solution is to perform raw material injection molding on the molding cavity 5 on the station before the last station, and realize raw material injection molding on the molding cavity 5 on the station before the last station. In view of the above-mentioned molding structure, a hot runner structure 1 6 is adopted to realize the injection of raw materials into the semi-finished products of the first few stations, and a hot runner structure 2 7 and a hot runner structure 3 8 are adopted to realize the injection of raw materials into the semi-finished products of the last station, which can improve the injection molding efficiency and stability while improving the molding quality of the product, and realize alternating injection molding of the two end faces of the semi-finished products in all the molding cavities 5 in front of the last cavity, so that after one end face of the semi-finished product processed in one station is molded, it will be processed again on the end face of the same end after one station is separated, ensuring that there is sufficient cooling time after the injection molding of both ends of the semi-finished product, thereby improving the injection molding quality of the product.

[0051] like Figure 8 and Figure 13 As shown, the hot runner 2 71 and the corresponding hot runner 3 81 are symmetrically arranged along the mold opening direction, the hot runner structure 2 7 is provided with a guide plate 2 72, and the hot runner structure is provided with a guide plate 3 82. The above-mentioned hot runner 2 71 is opened in the guide plate 2 72, and the above-mentioned hot runner 3 81 is opened in the guide plate 3 82. The hot runner 2 71 and the hot runner 3 81 are both arranged perpendicular to the mold opening direction.

[0052] like Figure 10-12 As shown, a diversion channel 62b is provided on the guide plate 1 62, and the middle part of the diversion channel 62b is radially dispersed outward to form a plurality of diversion branches 62c connected to the molding cavity 5, and the outlet of the diversion branch 62c is the above-mentioned runner outlet 62a, and the outlet of the hot runner 1 61 is connected to the middle part of the diversion channel 62b, and the diversion branch 62c is arranged perpendicular to the mold opening direction.

[0053] like Figure 2-8 As shown, a main nozzle 31 is provided in the fixed mold 3, one end of the main nozzle 31 is connected to the main shooting plate 32, a hot runner 61 is opened on the main shooting plate 32, and the hot runner structure 6 also includes a buffer plate 63 connected to the main shooting plate 32 at one end, and the other end of the buffer plate 63 is connected to the guide plate 62. The outlet of the hot runner 61 is connected to the buffer plate 63 along the mold opening direction, and a buffer flow channel 63a is opened in the buffer plate 63 along the vertical mold opening direction. The buffer flow channel 63a is connected to the middle part of the guide plate 62. The buffer plate 63 is located on the side of the guide plate 62 and the main shooting plate 32 away from the molding cavity 5. All molding cavities 5 are evenly distributed along the circumference of the rotating disk 41, and the connection between the buffer plate 63 and the guide plate 62 is set along the central axis direction close to the rotating disk 41.

[0054] like Figure 8 、 Figure 11 and Figure 12 As shown, the fixed mold 3 is provided with a plurality of parallel hot nozzles 33 and at least one hot nozzle 2 34, the movable mold 2 is provided with a hot nozzle 3 22 arranged in a one-to-one correspondence with the hot nozzle 2 34, and the movable mold 2 is provided with a hot nozzle 3 22. The hot nozzle 1 33, the hot nozzle 2 34 and the hot nozzle 3 22 are all arranged along the mold opening direction. The hot nozzle 1 33 is arranged between the guide plate 1 62 and the corresponding molding cavity 5 and connects the two. The hot nozzle 2 34 is arranged between the guide plate 2 72 and the finished product cavity 9 and connects the two. The hot nozzle 3 22 is arranged between the guide plate 3 82 and the corresponding finished product cavity 9 and connects the two. The hot nozzle 2 34 and the corresponding hot nozzle 3 22 are respectively located at the two ends of the finished product cavity 9 of the last workstation, and the hot nozzle 2 34 and the corresponding hot nozzle 3 22 are coaxially arranged.

[0055] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A hot runner system for a multi-station mold, comprising a movable mold (2) and a fixed mold (3), wherein the movable mold (2) is connected to a rotating motor (4), a motor shaft of the rotating motor (4) is connected to a rotating disk (41), a plurality of movable mold inserts (21) are connected to the rotating disk (41), and the plurality of movable mold inserts (21) are evenly distributed along the circumferential direction, the fixed mold (3) and the corresponding movable mold inserts (21) are combined to form at least two molding cavities (5) and a finished product cavity (9) of the last station, characterized in that: The hot runner system includes a hot runner structure 1 (6) and a hot runner structure 2 (7) provided on a fixed mold (3) and a hot runner structure 3 (8) provided on a movable mold (2), wherein the hot runner structure 1 (6) includes a hot runner 1 (61) provided on the fixed mold (3) and a guide plate 1 (62) connected to the outlet of the hot runner 1 (61), wherein the guide plate 1 (62) has a plurality of runner outlets (62a), and the runner outlets (62a ) are respectively connected to the corresponding molding cavity (5), the hot runner structure 2 (7) includes a hot runner 2 (71) opened on the fixed mold (3), and the hot runner structure 3 (8) includes a hot runner 3 (81) opened on the movable mold (2), the hot runner 2 (71) and the hot runner 3 (81) are respectively located at the two ends of the finished product cavity (9), and the outlet of the hot runner 2 (71) and the outlet of the hot runner 3 (81) are respectively connected to the finished product cavity (9).

2. The hot runner system of the multi-station mold according to claim 1, characterized in that: The hot runner 2 (71) and the corresponding hot runner 3 (81) are symmetrically arranged along the mold opening direction.

3. The hot runner system of the multi-station mold according to claim 1 or 2, characterized in that: The hot runner structure 2 (7) is provided with a guide plate 2 (72), and the hot runner structure is provided with a guide plate 3 (82). The hot runner 2 (71) is opened in the guide plate 2 (72), and the hot runner 3 (81) is opened in the guide plate 3 (82). The hot runner 2 (71) and the hot runner 3 (81) are both arranged perpendicular to the mold opening direction.

4. The hot runner system for a multi-station mold according to claim 1 or 2, characterized in that: A diversion channel (62b) is provided on the guide plate (62), and the middle portion of the diversion channel (62b) is radially dispersed outward to form a plurality of diversion branches (62c) connected to the molding cavity (5), the outlet of the diversion branch (62c) is the above-mentioned runner outlet (62a), and the outlet of the hot runner (61) is connected to the middle portion of the diversion channel (62b).

5. The hot runner system of the multi-station mold according to claim 4, characterized in that: The diversion branch (62c) is arranged perpendicular to the mold opening direction.

6. The hot runner system of the multi-station mold according to claim 1 or 2, characterized in that: A main nozzle (31) is provided in the fixed mold (3), one end of the main nozzle (31) is connected to the main injection plate (32), the hot runner (61) is opened on the main injection plate (32), the hot runner structure (6) also includes a buffer plate (63) connected to the main injection plate (32) at one end, the other end of the buffer plate (63) is connected to the guide plate (62), the outlet of the hot runner (61) is connected to the buffer plate (63) along the mold opening direction, the buffer plate (63) is provided with a buffer flow channel (63a) along the vertical mold opening direction, and the buffer flow channel (63a) is connected to the middle part of the guide plate (62).

7. The hot runner system for a multi-station mold according to claim 6, characterized in that: The buffer plate (63) is located on a side of the guide plate 1 (62) and the main shooting plate (32) away from the molding cavity (5).

8. The hot runner system for a multi-station mold according to claim 6, characterized in that: All the forming cavities (5) are evenly distributed along the circumference of the rotating disk (41), and the connection point between the buffer plate (63) and the guide plate 1 (62) is arranged along the direction close to the central axis of the rotating disk (41).

9. The hot runner system of the multi-station mold according to claim 3, characterized in that: The fixed mold (3) is provided with a plurality of parallel hot nozzles (33) and at least one hot nozzle (34). The movable mold (2) is provided with a hot nozzle (22) corresponding to the hot nozzle (34). The movable mold (2) is provided with the hot nozzle (22). The hot nozzle (33), the hot nozzle (34) and the hot nozzle (22) are all arranged along the mold opening direction. The hot nozzle (33) is arranged between the guide plate (62) and the corresponding molding cavity (5) and connects the two. The hot nozzle (34) is arranged between the guide plate (72) and the finished product cavity (9) and connects the two. The hot nozzle (22) is arranged between the guide plate (82) and the finished product cavity (9) and connects the two. The hot nozzle (34) and the corresponding hot nozzle (22) are respectively located at the two ends of the finished product cavity (9), and the hot nozzle (34) and the corresponding hot nozzle (22) are coaxially arranged.

10. The hot runner system of the multi-station mold according to claim 1 or 2, characterized in that: There are five molding cavities (5), the hot runner structure 1 (6) is connected to the five molding cavities (5) and can perform alternate injection molding on both ends of the semi-finished product, and the hot runner structure 2 (7) and the hot runner structure 3 (8) are connected to the finished product cavity (9).

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