Plastic part forming mold frame integrating hot runner and linkage ejection

Abstract

The invention relates to the technical field of injection molding devices, in particular to a plastic part forming mold frame integrating a hot runner and linkage ejection. Comprising a vertical frame and further comprises a variable amplitude reciprocating mechanism which is arranged on the vertical frame and connected with an injection mold frame capable of performing variable stroke reciprocating motion, the injection mold frame is rotationally connected with a fixed mold and fixedly provided with a first linear driving module, the first linear driving module is in transmission connection with a mold moving frame, and the mold moving frame is rotationally connected with a movable mold and a transmission mechanism; the movable mold and the fixed mold rotate synchronously, a forming mold cavity is formed after the movable mold and the fixed mold are closed, the ejection pipe is connected to the movable mold in a sliding mode, an air chamber and a valve chamber are formed in the movable mold, and four ejection spray holes are communicated between the air chamber and the valve chamber. The method has the beneficial effects that multi-parameter dynamic cooperative regulation and control in the whole injection molding process are achieved, and the problem that the forming quality is poor due to the fact that a traditional injection mold lacks the multi-parameter adaptation capacity is solved.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, specifically to a plastic part molding mold frame that integrates hot runner and linked ejection. Background Technology

[0002] Injection molds are core equipment for mass-producing complex-shaped plastic parts. Their performance directly determines the molding quality, dimensional accuracy, and production efficiency of the plastic parts. As the automotive, electronics, and home appliance industries continue to demand higher levels of structural complexity, lightweighting, and precision in plastic parts, traditional injection molds are gradually revealing many technical bottlenecks and are no longer able to meet the production needs of high-end products. Specific problems are as follows: Traditional injection molds cannot achieve dynamic and coordinated control of multiple parameters throughout the entire injection molding process, resulting in poor molding quality and difficulty in improving production efficiency. Specifically, injection molding is a complex dynamic process involving melt flow, heat transfer, pressure change, and phase transformation and solidification. The process requirements of each stage, such as filling, holding pressure, cooling, and demolding, are significantly different. Optimal molding results need to be achieved through dynamic adaptation of multiple parameters, such as vibration parameters, rotation state, temperature, and ejection method. However, in existing technologies, neither conventional injection molds nor the "plastic part molding mold with linkage ejection mechanism" disclosed in CN222309726U have solved the core problem of coordinated control of multiple parameters throughout the entire process. Based on this, the present invention provides a plastic part molding die frame that integrates hot runner and linked ejection to solve the problems mentioned in the background art. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a plastic part molding mold base that integrates hot runner and linked ejection to solve the problem that traditional injection molds cannot achieve multi-parameter dynamic collaborative control throughout the injection molding process, resulting in poor plastic part molding quality and difficulty in improving production efficiency.

[0004] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A plastic part molding mold frame integrating hot runner and linked ejection, including a stand, and further comprising: A variable amplitude reciprocating mechanism is mounted on a vertical frame, on which a variable stroke reciprocating injection mold frame is connected. A fixed mold is rotatably connected to the injection mold frame and a first linear drive module is fixedly mounted thereon. A moving mold frame is driven to the first linear drive module, and a moving mold is rotatably connected to the moving mold frame. The transmission mechanism is configured to achieve synchronous rotation of the moving mold and the fixed mold, which together form a molding cavity after being closed. The ejector tube is slidably connected to the moving mold. The moving mold has an air chamber and a valve chamber. Four ejector nozzles are connected between the air chamber and the valve chamber. A valve plate that is slidably connected to the valve chamber is fixedly installed at the front end of the ejector tube. The linkage ejection mechanism is configured to realize the displacement of the valve plate in the valve chamber and the opening and closing of the ejection nozzle; The air supply system is configured to supply air in the open state of the top nozzle; The temperature control system is configured to control the temperature of the moving mold.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] As a preferred technical solution of the present invention, the variable amplitude reciprocating mechanism includes a variable frequency motor fixed on a vertical frame, a main shaft and a secondary shaft rotating on the vertical frame, a synchronous belt drivingly connected to the output shaft of the variable frequency motor, the main shaft drivingly connected to the synchronous belt, bevel gears installed on both the main shaft and the secondary shaft, the two bevel gears meshing orthogonally, a second linear drive module fixed on the vertical frame, an amplitude adjustment frame drivingly connected to the second linear drive module, the amplitude adjustment frame slidingly connected to the vertical frame, a hollow shaft rotatably connected to the amplitude adjustment frame, the hollow shaft being linked to the main shaft, four toothed gears arrayed on the hollow shaft, a rack plate fixed on the injection mold frame, each toothed gear having a different driving stroke on the rack plate when meshing with the rack plate, and a return spring fixed on the injection mold frame, the other end of the return spring being fixedly connected to the vertical frame.

[0007] As a preferred technical solution of the present invention, the hollow shaft is provided with a hollow through groove that is open at both ends and slidably connected to the main shaft. The cross-section of the hollow through groove and the main shaft are both regular hexagonal. The width of the four toothed gears is the same as the width of the rack plate. An adjustment slot is fixedly provided between two adjacent toothed gears. The width of the adjustment slot is 1.25 times the width of the rack plate. The number of teeth of the four toothed gears are 2, 4, 6 and 8 respectively. The starting point of the teeth of the four toothed gears is the same. The central angle corresponding to the effective meshing arc segment on the toothed gear with 8 teeth is 150°.

[0008] As a preferred technical solution of the present invention, the transmission mechanism includes a transmission shaft rotatably connected to the upright frame and a square shaft rotatably connected to the injection mold frame. The transmission shaft is connected to a synchronous belt drive, and the square shaft is linked to the transmission shaft. A through shaft linked to the square shaft is rotatably connected to the mold moving frame. Transmission gears are fixedly installed on both the through shaft and the square shaft. Driven gear rings are fixedly installed on both the fixed mold and the moving mold. The two transmission gears are respectively meshed with the driven gear rings at corresponding positions.

[0009] As a preferred technical solution of the present invention, the through shaft is provided with a through hole that is open at both ends and slidably connected to the square shaft, and the square shaft is provided with a transmission groove that is open at the tail end and slidably connected to the transmission shaft. The cross-sections of the transmission groove, the through hole, the square shaft and the transmission shaft are all regular hexagonal.

[0010] As a preferred embodiment of the present invention, the linkage ejection mechanism includes a tailstock fixed to the back of the moving mold, an intermediate gear rotatably connected to the tailstock, an ejection toothed plate fixedly installed at the tail of the ejection tube, a transmission toothed plate slidably connected to the moving mold, both the ejection toothed plate and the transmission toothed plate meshing with the intermediate gear, the ejection toothed plate and the transmission toothed plate being respectively disposed on both sides of the intermediate gear, an ejection push plate fixedly installed at the tail of the ejection toothed plate, two elastic anti-compression members fixedly installed between the ejection push plate and the moving mold, a driven push block rotatably connected to the ejection push plate, the rotation axis of the driven push block being on the same straight line as the rotation axis of the moving mold, an ejection frame cooperating with the driven push block fixedly installed on the upright frame, and a limiting spring that is limited by the moving mold being sleeved on the ejection tube.

[0011] As a preferred technical solution of the present invention, the air supply system includes a high-pressure air pump fixedly mounted on a frame. An air filter is installed at the air inlet of the high-pressure air pump, and the air outlet of the high-pressure air pump is connected to a first corrugated metal pipe. A rotary joint is fixedly connected to the other end of the first corrugated metal pipe. An outlet air passage is opened at the axial position of the outlet pipe. The rotary joint is rotatably connected to the outlet air passage. Air holes are arrayed on the outlet pipe at positions corresponding to the air chambers. The air holes are connected to the air chambers. The outlet nozzles are inclined towards the axis of the outlet pipe, and the included angle between the outlet nozzles and the axis of the outlet pipe is 60°.

[0012] As a preferred embodiment of the present invention, the temperature control system includes a heating channel and a cooling channel formed within the moving mold. A heating ring tube is rotatably connected to the heating channel, and a cooling ring tube is rotatably connected to the cooling channel. A second corrugated metal pipe is fixedly connected to both the heating ring tube and the cooling ring tube. A flange joint is fixedly installed at the other end of each of the two second corrugated metal pipes. The heating channel is located on the outside of the forming mold cavity, and the cooling channel is located on the inside of the forming mold cavity. A temperature probe is fixedly installed on the moving mold, and a main controller is fixedly installed on the support frame. The data terminal of the temperature probe is connected to the main controller via a wireless signal connection.

[0013] As a preferred technical solution of the present invention, a plastic injection conduit is fixedly installed on the fixed mold, the plastic injection conduit is connected to the molding cavity, and a plastic injection inlet pipe is fixedly installed on the upright frame, the plastic injection inlet pipe and the plastic injection conduit are slidably connected.

[0014] The beneficial effects of this invention are: 1. This invention achieves dynamic and coordinated control of multiple parameters throughout the entire injection molding process, solving the problem of poor molding quality caused by the lack of multi-parameter adaptability in traditional injection molds. Through the deep linkage of the variable amplitude reciprocating mechanism, transmission mechanism, and temperature control system, it dynamically switches the toothed gear to achieve amplitude adaptation from 2 to 8 teeth according to the melt characteristics and molding requirements of different process stages such as filling, holding pressure, and cooling. It synchronously controls the rotation speed of the stationary mold and the moving mold from 750 rpm to 30 rpm, combined with the internal and external layered temperature control of the heating and cooling channels and real-time... Temperature feedback regulation forms a three-in-one coordinated control system of vibration, rotation, and temperature. Compared with the limitations of existing technologies that can only achieve single parameter control or independent function operation, this invention breaks through the melt flow barrier through large amplitude and high rotation speed in the filling stage, accurately compensates for shrinkage with medium amplitude and rotation speed in the holding pressure stage, and avoids adhesion and deformation with small amplitude and low speed in the cooling stage. The parameters are dynamically adapted and mutually empowered, effectively eliminating traditional defects such as material shortage, weld lines, shrinkage cavities, and warping, and greatly improving the density, dimensional accuracy, and surface smoothness of plastic parts.

[0015] 2. This invention constructs a combined mechanical linkage and high-pressure gas ejection system, solving the technical problems of scratches and uneven ejection caused by traditional hard ejection. It also achieves efficient coordination between the ejection function and other molding systems. The linked ejection mechanism precisely controls the valve plate displacement and the opening and closing of the ejection nozzles through the meshing transmission of the ejection frame, intermediate gear, and gear plate. Combined with the directional high-pressure airflow from the 60° inclined nozzles of the gas supply system, it forms a combined demolding mode of mechanical hole control and gas pushing. Simultaneously, the ejection action is deeply linked with the amplitude-variable vibration and synchronous rotation system, ensuring smooth operation during the cooling stage. Small-amplitude vibration provides a foundation for demolding and reduces adhesion. The extremely low rotation speed before demolding provides stable conditions for ejection. Clean high-pressure gas not only achieves smooth ejection but also helps to remove residual heat from the mold cavity, further ensuring the integrity of the molded part. Compared with the lack of coordination in the independent ejection mechanism of the prior art, the ejection function of this invention does not operate in isolation but forms a closed loop with the molding parameters of the whole process. This avoids damage to the molded part caused by hard ejection and improves demolding efficiency, ensuring that the molded part can be separated quickly without damage, highlighting the innovation and practicality of the design. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a plastic part molding die frame integrating a hot runner and a linked ejector according to the present invention; Figure 2 For the present invention Figure 1 A structural diagram from another perspective; Figure 3 This is a schematic diagram of the injection mold base and driven push block of the present invention; Figure 4 For the present invention Figure 3 A magnified schematic diagram of the partial structure at point A in the middle; Figure 5 For the present invention Figure 3 A magnified schematic diagram of the local structure at point B; Figure 6 For the present invention Figure 3 A magnified schematic diagram of the structure at point C in the middle; Figure 7 This is a schematic diagram of the square shaft and the injection molding inlet tube of the present invention; Figure 8 This is a schematic diagram of the temperature probe and driven push block of the present invention; Figure 9 For the present invention Figure 8 A magnified schematic diagram of the local structure at point D; Figure 10 This is a schematic diagram of the through shaft and transmission gear of the present invention.

[0017] The attached diagram lists the components represented by each number as follows: 1. Frame; 2. Injection mold frame; 3. Fixed mold; 4. First linear drive module; 5. Mold moving frame; 6. Moving mold; 7. Ejector tube; 8. Valve chamber; 9. Air chamber; 10. Ejector nozzle; 11. Valve plate; 12. Variable frequency motor; 13. Main shaft; 14. Sub-shaft; 15. Second linear drive module; 16. Amplitude adjustment frame; 17. Hollow shaft; 18. Gear with missing teeth; 19. Rack plate; 20. Return spring; 21. Drive shaft; 22. Square shaft; 23. Through shaft; 24. Drive gear; 25. Driven gear ring; 2 6. Tailstock; 27. Intermediate gear; 28. Ejector gear plate; 29. ​​Transmission gear plate; 30. Ejector push plate; 31. Elastic anti-pressure component; 32. Driven push block; 33. Ejector frame; 34. High-pressure air pump; 35. First corrugated metal pipe; 36. Ejector air passage; 37. Air hole; 38. Heating flow channel; 39. Heating ring pipe; 40. Cooling ring pipe; 41. Cooling flow channel; 42. Second corrugated metal pipe; 43. Temperature probe; 44. Main controller; 45. Injection plastic conduit; 46. Injection plastic inlet pipe; 47. Limit spring. Detailed Implementation

[0018] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0019] The present invention provides the following preferred embodiments. like Figure 1-10 As shown, a plastic part molding die frame integrating hot runner and linked ejection includes a stand 1, and further includes: A variable amplitude reciprocating mechanism is mounted on the upright frame 1, and a variable stroke reciprocating injection mold frame 2 is connected to it; The variable amplitude reciprocating mechanism includes a variable frequency motor 12 fixed on the frame 1, a main shaft 13 and a secondary shaft 14 rotating on the frame 1. A synchronous belt is driven to the output shaft of the variable frequency motor 12. The main shaft 13 is driven to the synchronous belt. Both the main shaft 13 and the secondary shaft 14 are equipped with bevel gears. The two bevel gears mesh orthogonally. A second linear drive module 15 is fixed on the frame 1. An amplitude adjustment frame 16 is driven to the second linear drive module 15. The amplitude adjustment frame 16 is slidably connected to the frame 1. A hollow shaft 17 is rotatably connected to the amplitude adjustment frame 16. The hollow shaft 17 is linked to the main shaft 13. The hollow shaft 17 has a hollow through groove with openings at both ends and slidably connected to the main shaft 13. Both the hollow through groove and the main shaft 13 have a regular hexagonal cross section. Four toothed gears 18 are arrayed on the hollow shaft 17. A rack plate 19 is fixedly mounted on the injection mold frame 2. When each toothed gear 18 meshes with the rack plate 19, the driving stroke of the rack plate 19 is different. A return spring 20 is fixedly mounted on the injection mold frame 2. The other end of the return spring 20 is fixedly connected to the upright frame 1. The width of each of the four toothed gears 18 is the same as the width of the rack plate 19. An adjustment slot is fixed between two adjacent toothed gears 18. The width of the adjustment slot is 1.25 times the width of the rack plate 19. The number of teeth of the four toothed gears 18 are 2, 4, 6 and 8 respectively. The starting point of the teeth of the four toothed gears 18 is the same. The central angle corresponding to the effective meshing arc segment on the toothed gear 18 with 8 teeth is 150°. The tooth pitch of the four missing-tooth gears is the same; The variable frequency motor 12 drives the main shaft 13 to rotate via a synchronous belt. The main shaft 13 and the bevel gear on the secondary shaft 14 mesh orthogonally to achieve power transmission. The hollow shaft 17 slides and links with the main shaft 13 through a regular hexagonal hollow through slot, ensuring that the rotational power is transmitted synchronously without affecting the amplitude adjustment. The second linear drive module 15 drives the amplitude adjustment frame 16 to slide along the upright frame 1, which can precisely switch the meshing of the toothed gear 18 with different numbers of teeth on the hollow shaft 17 with the rack plate 19. In conjunction with the return spring 20 on the injection mold frame 2, it can realize reciprocating vibration with different strokes.

[0020] During the filling stage of injection molding, the second linear drive module 15 drives the amplitude adjustment frame 16 to slide, so that the 8-tooth missing gear 18 on the hollow shaft 17 meshes with the rack plate 19. Its 8-tooth design corresponds to the longest drive stroke and 150° effective meshing arc segment, which can provide reciprocating vibration with the maximum amplitude. This amplitude can significantly reduce the flow resistance of the melt, break the flow barrier of the melt in the mold cavity, promote the melt to fill the corners of the molding cavity quickly and evenly, effectively eliminate defects such as missing material, weld lines and bubbles, and greatly improve the density and molding integrity of the plastic part. After entering the initial stage of pressure holding, the amplitude adjustment frame 16 is switched to the 6-tooth missing gear 18. The 6 teeth correspond to the medium amplitude, which can promote the orderly arrangement of the molten molecular chains through continuous slight vibration, make up for the volume loss caused by the cooling and shrinkage of the molten material, and reduce shrinkage cavities and depressions. After entering the later stage of pressure holding, the amplitude adjustment frame 16 is switched to the 4-tooth missing tooth gear 18. The 4 teeth correspond to the second smallest amplitude, which can stabilize the shape of the melt and avoid excessive vibration to generate flash. The two work together to achieve precise pressure holding and shrinkage compensation, reduce the internal stress of the plastic part, and improve dimensional accuracy and surface flatness. During the cooling stage, the amplitude adjustment frame 16 is switched to the 2-tooth missing gear 18. The minimum number of teeth corresponds to the shortest drive stroke and the minimum amplitude. This small amplitude avoids excessive adhesion between the molten material and the mold wall when it solidifies through extremely slight reciprocating vibration, creating favorable conditions for subsequent linkage ejection, and does not interfere with the shaping process of the plastic part. It effectively suppresses warping and deformation during the cooling stage and ensures the stability of the plastic part's shape. The precise switching of the toothed gear 18 at each stage enables dynamic adaptation of the amplitude to the melt state and molding requirements of each stage of injection molding. This creatively integrates variable amplitude vibration with the injection molding process, solving technical problems such as uneven filling, insufficient holding pressure, and cooling deformation in traditional injection molding. Furthermore, through the vibration effect of the adapted amplitude at each stage, it synergistically improves the density, dimensional stability, surface quality, and demolding convenience of the plastic parts, forming an integrated molding solution that combines molding efficiency and product quality.

[0021] The injection mold frame 2 is rotatably connected to the fixed mold 3 and fixedly mounted with the first linear drive module 4. The first linear drive module 4 is driven to be connected to the mold moving frame 5. The mold moving frame 5 is rotatably connected to the moving mold 6. After the moving mold 6 and the fixed mold 3 are closed, a molding cavity is formed. A sealing ring groove is provided on the side of the fixed mold 3 that is opposite to the moving mold 6, and a sealing ring that matches the sealing ring groove is fixed on the side of the moving mold 6 that is opposite to the fixed mold 3. The first linear drive module 4 drives the mold moving frame 5 to move the moving mold 6 towards the fixed mold 3. When the two molds close to form a molding cavity, the sealing ring on the moving mold 6 is precisely embedded in the sealing ring groove of the fixed mold 3, forming a sealed structure through the tight fit between the sealing ring and the groove wall.

[0022] When the mold is closed, the tight fit between the sealing ring and the groove wall can effectively prevent the molten material in the molding cavity from overflowing from the gap between the mold joint surfaces, thus avoiding the generation of flash defects from the source. At the same time, it ensures the airtightness of the molding cavity, prevents external air from entering the molding cavity and mixing with the molten material to form bubbles, and stabilizes the pressure environment in the molding cavity, providing a stable pressure foundation for amplitude vibration and synchronous rotation. The transmission mechanism is configured to achieve synchronous rotation of the moving mold 6 and the fixed mold 3; The transmission mechanism includes a transmission shaft 21 rotatably connected to the upright frame 1 and a square shaft 22 rotatably connected to the injection mold frame 2. The transmission shaft 21 is connected to the synchronous belt drive, and the square shaft 22 is linked with the transmission shaft 21. A through shaft 23 linked with the square shaft 22 is rotatably connected to the mold moving frame 5. Transmission gears 24 are fixedly installed on both the through shaft 23 and the square shaft 22. Driven gear rings 25 are fixedly installed on both the fixed mold 3 and the moving mold 6. The two transmission gears 24 are respectively meshed with the driven gear rings 25 at the corresponding positions. The through shaft 23 has a through hole that is open at both ends and slidably connected to the square shaft 22. The square shaft 22 has a transmission groove that is open at the tail end and slidably connected to the transmission shaft 21. The cross-sections of the transmission groove, the through hole, the square shaft 22 and the transmission shaft 21 are all regular hexagonal. During the injection filling stage, the transmission mechanism drives the fixed mold 3 and the moving mold 6 to rotate synchronously at a speed of 750 rpm. The centrifugal force generated by this high speed can work synergistically with the variable amplitude reciprocating vibration to push the molten material to spread quickly and evenly along the inner wall of the molding cavity. Especially for complex cavities or thin-walled plastic parts, it can effectively overcome the flow resistance of the molten material, prevent the molten material from accumulating or stagnating in the corners of the cavity, and ensure that the entire cavity is completely filled. At the same time, the centrifugal force can cause the air bubbles in the molten material to converge towards the center and be discharged, reducing air bubble defects and improving the integrity of the plastic part molding. After entering the holding pressure stage, the rotation speed of the fixed mold 3 and the moving mold 6 is reduced to 400 rpm in sync. The continuous medium rotation speed can keep the melt active under the holding pressure, make up for the volume loss caused by cooling and shrinkage, and promote the orderly arrangement of the melt molecular chains along the rotation direction, enhance the compactness and mechanical stability of the internal structure of the plastic part, and avoid the shrinkage and depression problems caused by the melt solidifying too quickly in the traditional holding pressure process. During the cooling stage, the rotation speed of the fixed mold 3 and the moving mold 6 is further reduced to a low speed of 200 rpm. The low speed rotation can keep the plastic part and the inner wall of the mold cavity slightly moving, avoiding excessive adhesion between the plastic part and the mold wall when the plastic part cools and solidifies. At the same time, it promotes the uniform dissipation of heat in the mold cavity, prevents warping and deformation of the plastic part caused by excessive local temperature difference, and ensures the dimensional accuracy of the plastic part. Before demolding, the rotation speed of the fixed mold 3 and the moving mold 6 is reduced to an extremely low level of 30 rpm. At this time, the fixed mold 3 and the moving mold 6 are almost stationary, which provides a stable working condition for the linkage ejection mechanism to accurately trigger the displacement of the valve plate 11 and open the ejection nozzle 10. It also avoids friction and scratches on the plastic part caused by the rotation of the mold during demolding. With the air supply system's 60° tilted nozzle air jet, the plastic part can be demolded smoothly and without damage. This rotation speed change that is dynamically adapted according to the injection stage deeply integrates the rotational motion with the injection molding process. It not only solves the technical problems of uneven filling, insufficient holding pressure, cooling deformation, and demolding damage in traditional injection molding, but also synergistically improves the density, mechanical properties, dimensional stability, and surface quality of the plastic part, forming an efficient and high-quality integrated molding solution.

[0023] Ejector pipe 7 is slidably connected to moving mold 6. Moving mold 6 has air chamber 9 and valve chamber 8. Four ejector nozzles 10 are connected between air chamber 9 and valve chamber 8. A valve plate 11 that is slidably connected to valve chamber 8 is fixedly installed at the front end of ejector pipe 7. The linkage ejection mechanism is configured to realize the displacement of the valve plate 11 in the valve chamber 8 and the opening and closing of the ejection nozzle 10; The linkage ejection mechanism includes a tailstock 26 fixed to the back of the moving mold 6, an intermediate gear 27 rotatably connected to the tailstock 26, an ejection toothed plate 28 fixedly installed at the tail of the ejection tube 7, a transmission toothed plate 29 slidably connected to the moving mold 6, and both the ejection toothed plate 28 and the transmission toothed plate 29 meshing with the intermediate gear 27. The ejection toothed plate 28 and the transmission toothed plate 29 are respectively located on both sides of the intermediate gear 27. An ejection push plate 30 is fixedly installed at the tail of the ejection toothed plate 28. Two elastic anti-pressure members 31 are fixedly installed between the ejection push plate 30 and the moving mold 6. A driven push block 32 is rotatably connected to the ejection push plate 30. The rotation axis of the driven push block 32 is on the same straight line as the rotation axis of the moving mold 6. An ejection frame 33 that cooperates with the driven push block 32 is fixedly installed on the upright frame 1.

[0024] A limiting spring 47, which is limited by the moving mold 6, is fitted on the ejector tube 7; The transmission ratio of the intermediate gear 27 is 1:1, ensuring that the displacement of the ejector gear plate 28 and the transmission gear plate 29 are equal. During the demolding stage, the variable amplitude reciprocating mechanism drives the injection mold frame 2 to move. When the moving mold 6 reaches the preset ejection position, the ejector frame 33 on the stand 1 contacts the driven push block 32 and generates a resisting force, pushing the ejector plate 30 to compress the elastic anti-pressure member 31. The ejector plate 30 drives the ejector tooth plate 28 to move. Through the meshing transmission of the intermediate gear 27, the transmission tooth plate 29 slides synchronously, thereby driving the ejector tube 7 to move axially along the moving mold 6, realizing the sliding of the valve plate 11 in the valve chamber 8 and the precise opening of the ejector nozzle 10. The air supply system is configured to supply air to the top nozzle 10 in the open state; In a preferred embodiment, the outlet pressure of the ejector nozzle 10 is 0.8 MPa; The air supply system includes a high-pressure air pump 34 fixed on the upright frame 1. An air filter is installed at the air inlet of the high-pressure air pump 34. The air outlet of the high-pressure air pump 34 is connected to a first corrugated metal pipe 35. The other end of the first corrugated metal pipe 35 is fixedly connected to a rotary joint. An outlet air passage 36 is opened at the axial position of the outlet pipe 7. The rotary joint is rotatably connected to the outlet air passage 36. Air holes 37 are arrayed on the outlet pipe 7 at positions corresponding to the air chamber 9. The air holes 37 are connected to the air chamber 9. The outlet nozzle 10 is inclined towards the axis of the outlet pipe 7. The angle between the outlet nozzle 10 and the axis of the outlet pipe 7 is 60°. When the linkage ejection mechanism opens the ejection nozzle 10, the high-pressure air pump 34 starts. The air is filtered by the air filter to form clean high-pressure gas, which is delivered to the rotary joint through the first corrugated metal pipe 35, and then introduced into the ejection air passage 36 of the ejection pipe 7 by the rotary joint. It enters the air chamber 9 through the air hole 37 on the ejection pipe 7, and is finally ejected directionally from the ejection nozzle 10 which is inclined at 60° to the axis of the ejection pipe 7. The rotary joint solves the problem of air passage connection when the ejector tube 7 rotates with the mold, ensuring continuous and uninterrupted gas delivery; The 60° inclined ejector nozzle 10 concentrates the airflow onto the inner wall of the plastic part, forming a uniform and highly directional thrust, thus avoiding excessive local stress that could lead to deformation of the plastic part. Clean gas not only enables rapid separation of the plastic part from the mold cavity, but also removes residual heat from the molding cavity, assisting in the cooling and solidification of the plastic part; The aforementioned mechanism has constructed a composite demolding mode of mechanical linkage hole control and high-pressure gas ejection, which solves the problems of scratches and uneven ejection that are easily generated by traditional hard ejection, and greatly improves demolding efficiency and the surface integrity of plastic parts; The temperature control system is configured to control the temperature of the moving mold 6.

[0025] The temperature control system includes a heating channel 38 and a cooling channel 41 located within the moving mold 6. A heating ring pipe 39 is rotatably connected to the heating channel 38, and a cooling ring pipe 40 is rotatably connected to the cooling channel 41. A second corrugated metal pipe 42 is fixedly connected to both the heating ring pipe 39 and the cooling ring pipe 40. A flange joint is fixedly installed at the other end of each of the two second corrugated metal pipes 42. The heating channel 38 is located on the outside of the molding cavity, and the cooling channel 41 is located on the inside of the molding cavity. A temperature probe 43 is fixedly installed on the moving mold 6, and a main controller 44 is fixedly installed on the support frame 1. The data terminal of the temperature probe 43 is connected to the main controller 44 via a wireless signal connection.

[0026] A plastic injection conduit 45 is fixedly installed on the fixed mold 3, and the plastic injection conduit 45 is connected to the molding cavity. A plastic injection inlet pipe 46 is fixedly installed on the upright frame 1, and the plastic injection inlet pipe 46 is slidably connected to the plastic injection conduit 45.

[0027] Specifically, a sealing ring is fitted around the outside of the injection plastic conduit 45, and the injection plastic conduit 45 is sealed and connected to the injection plastic inlet pipe 46 through the sealing ring; During the injection molding process, the temperature probe 43 on the moving mold 6 collects the temperature data around the mold cavity in real time and transmits it to the main controller 44 via wireless signal. The main controller 44 controls the delivery of heating or cooling medium according to the preset temperature threshold. When the temperature is below the threshold, the heating medium enters the heating ring pipe 39 through the flange joint and the second corrugated metal pipe 42, and is heated through the heating flow channel 38 outside the forming mold cavity; When the temperature is higher than the threshold, the cooling medium enters the cooling channel 41 inside the molding cavity through the cooling ring pipe 40 to cool down, thereby achieving dynamic temperature control. In a preferred embodiment, the heating medium of the temperature control system is No. 320 heat transfer oil, and the cooling medium is 25°C cooling water. The heating channel 38 and the cooling channel 41 are arranged in an inner and outer layer. With the real-time monitoring and wireless data transmission of the temperature probe 43, the temperature of the moving mold 6 is accurately and quickly controlled, avoiding the problems of large temperature difference and slow response of traditional temperature control systems. During the filling stage, the fluidity of the melt is ensured; during the holding stage, the shrinkage activity of the melt is maintained; and during the cooling stage, the uniform shaping of the plastic part is promoted. In deep coordination with the amplitude vibration and synchronous rotation mechanism, the warping, shrinkage, and sink marks of the plastic part are effectively suppressed. The second corrugated metal pipe 42 is adapted to the rotary joint to ensure stable media delivery when the mold rotates. The flange joint ensures the sealing and disassembly of the pipeline connection, improving the practicality and ease of maintenance of the equipment.

[0028] The specific steps for using this invention are as follows: The first linear drive module 4 drives the mold moving frame 5 to move the moving mold 6 towards the fixed mold 3. The mold closing and sealing are achieved by the fit of the sealing ring and the sealing ring groove, forming the molding cavity. The plastic injection pipe 46 and the plastic injection conduit 45 are slidably connected to transport the molten material. The variable frequency motor 12 drives the main shaft 13 to rotate via a synchronous belt. On the one hand, the power is transmitted through the bevel gear, and on the other hand, the hollow shaft 17 is driven to rotate by the regular hexagonal hollow slot. At the same time, the transmission shaft 21, square shaft 22, and through shaft 23 are linked by the regular hexagonal structure, so that the transmission gear 24 drives the fixed mold 3 and the moving mold 6 to rotate synchronously. The second linear drive module 15 can adjust the amplitude adjustment frame 16 to switch the toothed gear 18 with different number of teeth on the hollow shaft 17 to mesh with the rack plate 19, and cooperate with the return spring 20 to realize the variable amplitude reciprocating vibration of each process stage. During the filling stage, an 8-tooth missing gear 18 is used in conjunction with a 750rpm rotation speed to promote rapid and uniform filling of the molten material. In the initial stage of pressure holding, a 6-tooth gear is switched and the rotation speed is reduced to 400rpm. In the later stage, a 4-tooth gear is switched to accurately compensate for shrinkage. During the cooling stage, a 2-tooth gear is switched and the rotation speed is reduced to 200rpm to avoid adhesion and deformation. During the temperature control process, the temperature probe 43 collects the temperature data of the moving mold 6 in real time and transmits it to the main controller 44. The main controller 44 dynamically adjusts the delivery of heating or cooling media through the inner and outer layered layout of the heating channel 38 and the cooling channel 41 to ensure the required temperature of the molten material at each stage. During demolding, the injection mold frame 2 moves to the preset position, the ejector frame 33 abuts against the driven push block 32, and the ejector tube 7 is driven to move through the meshing transmission of the ejector push plate 30, the ejector tooth plate 28 and the intermediate gear 27, opening the ejector nozzle 10. The high-pressure air pump 34 delivers filtered clean gas, which is sprayed out directionally through the 60° inclined ejector nozzle 10, so as to achieve smooth and damage-free demolding of the plastic part. The various mechanisms work together to complete the integrated molding of the plastic part.

[0029] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A plastic part molding die frame integrating hot runner and linked ejection, comprising a stand (1), characterized in that, Also includes: A variable amplitude reciprocating mechanism is set on a stand (1), and a variable stroke reciprocating injection mold frame (2) is connected to it. A fixed mold (3) is rotatably connected to the injection mold frame (2) and a first linear drive module (4) is fixedly mounted on it. A moving mold frame (5) is connected to the first linear drive module (4) and a moving mold (6) is rotatably connected to the moving mold frame (5). The transmission mechanism is configured to achieve synchronous rotation of the moving mold (6) and the fixed mold (3), and the moving mold (6) and the fixed mold (3) form a molding cavity after they are closed. The ejector tube (7) is slidably connected to the moving mold (6). The moving mold (6) has an air chamber (9) and a valve chamber (8). There are four ejector nozzles (10) between the air chamber (9) and the valve chamber (8). The front end of the ejector tube (7) is fixedly installed with a valve plate (11) that is slidably connected to the valve chamber (8). The linkage ejection mechanism is configured to realize the displacement of the valve plate (11) in the valve chamber (8) and the opening and closing of the ejection nozzle (10); The air supply system is configured to supply air to achieve the open state of the top nozzle (10); The temperature control system is configured to control the temperature of the moving mold (6).

2. The integrated hot runner and linked ejection plastic part molding die frame according to claim 1, characterized in that, The variable amplitude reciprocating mechanism includes a variable frequency motor (12) fixed on the frame (1), a main shaft (13) rotating on the frame (1), and a secondary shaft (14). A synchronous belt is driven to the output shaft of the variable frequency motor (12). The main shaft (13) is driven to the synchronous belt. Both the main shaft (13) and the secondary shaft (14) are equipped with bevel gears, which mesh orthogonally. A second linear drive module (15) is fixed on the frame (1). An amplitude adjustment frame (16) is driven to the second linear drive module (15). 16) Sliding connection with the upright (1), the amplitude adjustment frame (16) is rotatably connected to a hollow shaft (17), the hollow shaft (17) is linked with the main shaft (13), four toothed gears (18) are arrayed on the hollow shaft (17), a rack plate (19) is fixedly mounted on the injection mold frame (2), each toothed gear (18) has a different driving stroke on the rack plate (19) when meshing with the rack plate (19), a return spring (20) is fixedly mounted on the injection mold frame (2), and the other end of the return spring (20) is fixedly connected to the upright (1).

3. A plastic part molding die frame integrating hot runner and linked ejection as described in claim 2, characterized in that, The hollow shaft (17) has a hollow through groove with openings at both ends and slidably connected to the main shaft (13). The cross-sections of the hollow through groove and the main shaft (13) are both regular hexagons. The widths of the four toothed gears (18) are the same as the width of the rack plate (19). An adjustment gap is fixedly provided between two adjacent toothed gears (18). The width of the adjustment gap is 1.25 times the width of the rack plate (19). The number of teeth of the four toothed gears (18) are 2, 4, 6 and 8 respectively. The starting point of the teeth of the four toothed gears (18) is the same. The central angle corresponding to the effective meshing arc segment on the toothed gear (18) with 8 teeth is 150°.

4. The integrated hot runner and linked ejection plastic part molding die frame according to claim 1, characterized in that, The transmission mechanism includes a transmission shaft (21) rotatably connected to the upright frame (1) and a square shaft (22) rotatably connected to the injection mold frame (2). The transmission shaft (21) is connected to the synchronous belt drive, and the square shaft (22) is linked with the transmission shaft (21). A through shaft (23) linked with the square shaft (22) is rotatably connected to the mold moving frame (5). Transmission gears (24) are fixedly installed on both the through shaft (23) and the square shaft (22). Driven gear rings (25) are fixedly installed on both the fixed mold (3) and the moving mold (6). The two transmission gears (24) are respectively meshed with the driven gear rings (25) at the corresponding positions.

5. A plastic part molding die frame integrating hot runner and linked ejection as described in claim 4, characterized in that, The through shaft (23) has a through hole with openings at both ends and sliding connection with the square shaft (22). The square shaft (22) has a transmission groove with an opening at the tail end and sliding connection with the transmission shaft (21). The cross-sections of the transmission groove, through hole, square shaft (22) and transmission shaft (21) are all regular hexagons.

6. A plastic part molding die frame integrating hot runner and linked ejection as described in claim 1, characterized in that, The linkage ejection mechanism includes a tailstock (26) fixed to the back of the moving mold (6), an intermediate gear (27) rotatably connected to the tailstock (26), an ejection toothed plate (28) fixedly installed at the tail of the ejection tube (7), and a transmission toothed plate (29) slidably connected to the moving mold (6). Both the ejection toothed plate (28) and the transmission toothed plate (29) are meshed with the intermediate gear (27). The ejection toothed plate (28) and the transmission toothed plate (29) are respectively arranged on both sides of the intermediate gear (27). The tail of the plate (28) is fixedly fitted with an ejector plate (30). Two elastic anti-pressure members (31) are fixedly fitted between the ejector plate (30) and the moving mold (6). A driven push block (32) is rotatably connected to the ejector plate (30). The rotation axis of the driven push block (32) is on the same straight line as the rotation axis of the moving mold (6). An ejector frame (33) that cooperates with the driven push block (32) is fixedly fitted on the stand (1). A limiting spring (47) that is limited by the moving mold (6) is sleeved on the ejector tube (7).

7. A plastic part molding die frame integrating hot runner and linked ejection as described in claim 1, characterized in that, The air supply system includes a high-pressure air pump (34) fixed on the stand (1). An air filter is installed at the air inlet of the high-pressure air pump (34). The air outlet of the high-pressure air pump (34) is connected to a first corrugated metal pipe (35). The other end of the first corrugated metal pipe (35) is fixedly connected to a rotary joint. An outlet air passage (36) is opened at the axial position of the outlet pipe (7). The rotary joint is rotatably connected to the outlet air passage (36). An air hole (37) is arrayed on the outlet pipe (7) at the position corresponding to the air chamber (9). The air hole (37) is connected to the air chamber (9). The outlet nozzle (10) is inclined towards the axis of the outlet pipe (7). The angle between the outlet nozzle (10) and the axis of the outlet pipe (7) is 60°.

8. A plastic part molding die frame integrating hot runner and linked ejection as described in claim 1, characterized in that, The temperature control system includes a heating channel (38) and a cooling channel (41) opened in the moving mold (6). A heating ring pipe (39) is rotatably connected to the heating channel (38), and a cooling ring pipe (40) is rotatably connected to the cooling channel (41). A second corrugated metal pipe (42) is fixedly connected to both the heating ring pipe (39) and the cooling ring pipe (40). A flange joint is fixedly installed at the other end of each of the two second corrugated metal pipes (42). The heating channel (38) is located on the outside of the forming cavity, and the cooling channel (41) is located on the inside of the forming cavity. A temperature probe (43) is fixedly installed on the moving mold (6), and a main controller (44) is fixedly installed on the stand (1). The data terminal of the temperature probe (43) is connected to the main controller (44) via a wireless signal connection.

9. A plastic part molding die frame integrating hot runner and linked ejection as described in claim 1, characterized in that, A plastic injection conduit (45) is fixedly installed on the fixed mold (3), and the plastic injection conduit (45) is connected to the molding cavity. A plastic injection inlet pipe (46) is fixedly installed on the stand (1), and the plastic injection inlet pipe (46) is slidably connected to the plastic injection conduit (45).

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