A kind of roto-planet rubber coating injection molding machine and rubber coating method

Abstract

The application belongs to the technical field of rubber-coated injection molding of wandering star wheel, in particular to a rubber-coated injection molding machine and a rubber-coating method. The machine comprises a workbench, a stand fixed to one side of the workbench, a lifting injection mechanism arranged on the stand, a fixing seat fixed to the top of the workbench, a rotating disc rotatably connected to the top of the fixing seat, a water-cooling plate fixed to the top of the rotating disc, a lower mold plate fixed to the top of the water-cooling plate, and a water-cooling pipe arranged in the water-cooling plate. The water-cooling plate is arranged at the bottom of the lower mold plate, and a heat dissipation plate and heat dissipation fins are arranged in the water-cooling plate. The end of the heat dissipation fins extends to the inner cavity of the water-cooling pipe, effectively increasing the heat exchange contact area between the cooling water and the mold, shortening the heat conduction path, quickly conducting the residual heat accumulated at the bottom of the mold cavity, strengthening the overall heat exchange capacity, accelerating the cooling and setting speed of the colloid, shortening the molding cycle, and improving the production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of planetary wheel overmolding technology, specifically a planetary wheel overmolding machine and overmolding method. Background Technology

[0002] The planetary wheel overmolding injection molding machine is a vertical rotary table-type injection molding equipment specifically designed for overmolding metal inserts. It is mainly used for one-time overmolding of the outer periphery of a planetary wheel metal substrate with thermoplastic colloid. The equipment adopts a vertical mold closing and vertical injection structure, and is equipped with a multi-station rotary table. It can sequentially complete continuous processes such as insert feeding, mold closing and injection, water cooling and shaping, demolding and part removal, and is suitable for the precision overmolding requirements of planetary wheels.

[0003] In the existing technology, the water-cooling structure in the planetary wheel overmolding injection molding machine relies solely on the indirect heat conduction between the outer wall of the water-cooling channel and the mold steel plate. The heat at the bottom of the mold cavity needs to penetrate the mold steel plate layer by layer to be transferred to the cooling water, resulting in a long heat conduction path, low heat exchange efficiency, and an extended overall cooling and setting time to ensure the curing and setting of the colloid. This significantly lengthens the single injection molding cycle and limits the mass production capacity of vertical turntable multi-station equipment.

[0004] Therefore, the present invention provides a planetary wheel overmolding injection molding machine and an overmolding method. Summary of the Invention

[0005] To overcome the shortcomings of the prior art and solve the problems mentioned in the background art, the present invention proposes a planetary wheel overmolding injection molding machine and an overmolding method.

[0006] The technical solution applicable to solving the technical problem of this invention is as follows: A planetary gear overmolding injection molding machine of this invention includes a worktable, a column fixedly connected to one side of the worktable, a lifting injection mechanism on the column, a fixed base fixedly connected to the top of the worktable, a rotating disk rotatably connected to the top of the fixed base, a water-cooling plate fixedly connected to the top of the rotating disk, a lower template fixedly connected to the top of the water-cooling plate, water-cooling pipes arranged inside the water-cooling plate, a heat dissipation and heat conduction mechanism between the water-cooling pipes and the lower template, a water-cooling box arranged on one side of the worktable, the water-cooling pipes forming a closed-loop water circuit with the water-cooling box through a water circulation mechanism, and the worktable being driven by a rotation drive mechanism that can rotate the rotating disk.

[0007] Preferably, the lifting and dispensing mechanism includes a cylinder and a dispensing cylinder. The cylinder is fixedly installed on the column. The output end of the cylinder is fixedly connected to a mounting plate. The bottom of the mounting plate is fixedly connected to a mounting plate. The bottom of the mounting plate is fixedly connected to an upper template. The top of the mounting plate is fixedly connected to a dispensing cylinder. The bottom end of the dispensing cylinder is fixedly connected to a dispensing pipe. The end of the dispensing pipe away from the dispensing cylinder extends into the inner cavity of the upper template. The bottom of the upper template is evenly provided with several dispensing holes. Both the mounting plate and the mounting plate are slidably connected to the side wall of the column.

[0008] Preferably, the heat dissipation and heat conduction mechanism includes a heat dissipation plate and a heat dissipation fin. The water-cooled plate is evenly provided with a plurality of heat dissipation grooves. A water-cooling pipe is fixedly connected to the bottom of the heat dissipation groove. A plurality of arc-shaped grooves are evenly provided on the top of the water-cooling pipe. A heat dissipation plate is fixedly connected to the top of the inner wall of the heat dissipation groove. The top of the heat dissipation plate is in contact with the bottom of the lower template. A heat dissipation fin is fixedly connected to the bottom of the heat dissipation plate. The heat dissipation fin extends through the arc-shaped groove into the inner cavity of the water-cooling pipe. A plurality of vertical grooves are evenly provided on the heat dissipation fin.

[0009] Preferably, the water circulation mechanism includes a water pump, which is fixedly installed on the water-cooled box. An inlet chamber is formed inside the water-cooling plate, and an outlet chamber is formed inside the rotating disk. Connecting pipe 1 and connecting pipe 2 are fixedly connected to both ends of the water-cooling pipe, respectively. The end of connecting pipe 1 away from the water-cooling pipe extends into the inlet chamber, and the end of connecting pipe 2 away from the water-cooling pipe extends into the outlet chamber. An inlet pipe is rotatably connected inside the inlet chamber, and a water delivery pipe is fixedly connected to the end of the inlet pipe away from the inlet chamber. The fixed base is embedded with a water outlet pipe, the top end of which is rotatably connected to the water outlet cavity. A drain pipe is fixedly connected to the end of the water outlet pipe away from the water outlet cavity. A water pump is connected to a water delivery pipe. A suction pipe is connected to the water pump. The end of the suction pipe away from the water pump extends to the bottom of the inner cavity of the water-cooled box. The end of the drain pipe away from the water outlet pipe is connected to the inner cavity of the water-cooled box. An air-cooled heat dissipation component is provided inside the water-cooled box. A cleaning and replenishment component is provided on one side of the water-cooled box.

[0010] Preferably, the air-cooled heat dissipation assembly includes a fan, the fan is fixedly installed on the outer wall of the water-cooled box, a water-cooling cavity is opened inside the water-cooled box, the water-cooling cavity is zigzag-shaped, a drain pipe is connected to the water-cooling cavity, a number of arc-shaped protrusions are evenly distributed on the inner wall of the water-cooling cavity, the bottom end of the water-cooling cavity is connected to the inner cavity of the water-cooled box, a number of air-cooling cavities are evenly distributed inside the water-cooled box, the air-cooling cavities are isosceles trapezoidal in shape, heat dissipation fins are fixedly connected to the top and bottom of the air-cooling cavities, a number of air-cooling channels are opened inside the water-cooled box, two adjacent air-cooling cavities are connected through the air-cooling channels, and the air-cooling cavities and air-cooling channels form a serpentine shape, an air inlet is opened on the side wall of the water-cooled box, the air inlet is connected to the air-cooling cavity located at the bottom, an air outlet is opened on the top of the water-cooled box, the air outlet is connected to the air-cooling channel, and the fan is adapted to the air inlet.

[0011] Preferably, the cleaning and replenishing fluid assembly includes a storage tank. The storage tank is provided on one side of the water-cooled box. A second water pump is fixedly installed on the top of the storage tank. A second water delivery pipe is fixedly connected to the end of the inlet pipe away from the inlet chamber. A second drain pipe is fixedly connected to the end of the outlet pipe away from the outlet chamber. Valves are fixedly installed on the first water delivery pipe, the second water delivery pipe, the first drain pipe, and the second drain pipe. The end of the second water delivery pipe away from the inlet pipe is connected to the second water pump. A second suction pipe is connected to the second water pump. The end of the second suction pipe away from the second water pump extends into the inner cavity of the storage tank.

[0012] Preferably, the rotary drive mechanism includes a motor, the motor is fixedly installed on one side of the worktable, a spur gear is fixedly connected to the output end of the motor, a gear ring is fixedly connected to the outer wall of the lower template, the spur gear meshes with the gear ring, a marking protrusion is provided on the outer wall of the fixed seat, a second cylinder is fixedly installed on one side of the worktable, an arc plate is fixedly connected to the output end of the second cylinder, and a positioning protrusion is provided on both sides of the arc plate.

[0013] Preferably, a number of sets of limiting rods are uniformly fixed to the top of the rotating disk, and a top plate is slidably connected to each set of limiting rods. Two positioning protrusions are symmetrically provided on the top plate, and the positioning protrusions are adapted to the positioning protrusions. A number of ejector pins are uniformly fixed to the top of the top plate, and the ejector pins are adapted to the lower template. A spring is fixed between the top of the top plate and the top of the limiting rod.

[0014] Preferably, the bottom of the second mounting plate is symmetrically fixed with two positioning rods, the positioning rods are stepped rods, a plurality of positioning holes are evenly opened on the lower template, the positioning holes are stepped holes, the positioning holes are adapted to the positioning rods, a plurality of clearance holes are evenly opened on the heat dissipation plate, and a plurality of clearance posts are evenly fixed in the heat dissipation groove, the clearance holes and clearance posts are adapted to the ejector pins.

[0015] A method for overmolding a planetary gear, applicable to the aforementioned planetary gear overmolding injection molding machine, comprising the following steps: S1: Place the planetary wheel metal cores into the lower template cavity in sequence. Drive the gear ring of the motor to rotate the rotating disk and the lower template to change positions until the mold cavity with the planetary wheel metal cores rotates to the bottom of the upper template. Start the cylinder to drive the upper template to move down as a whole. Use the positioning rod and positioning hole to guide and limit the movement. The upper and lower templates fit together precisely and close, ensuring accurate alignment of the cavity. S2: After the mold is closed, the molten rubber in the injection cylinder is evenly injected into the lower mold cavity through the injection pipe and injection hole, and the ring-shaped rubber filling is completed on the outer circumference of the metal wheel core. The cooling water is circulated in a closed loop through the water cooling pipe by the water pump. The heat exchange is enhanced by the heat dissipation plate attached to the bottom of the mold cavity and the heat dissipation fins with vertical grooves extending into the water channel, and the heat is quickly and evenly removed. The return water is cooled down by the zigzag water cooling cavity and air cooling cavity and the heat dissipation fins, and the temperature is continuously kept constant, so that the rubber coating can be quickly shaped and shrink evenly. S3: During demolding and material removal, cylinder one drives the upper mold plate to move upward to open the mold, and the motor drives the lower mold plate to rotate to the arc plate, so that the top plate is aligned with the arc plate. Cylinder two drives the arc plate to slide upward, so that the top plate drives the ejector pin to perform an ejection action, lifting the formed planetary wheel workpiece. The finished product is then manually removed, and the ejector pin automatically resets, entering the next injection molding cycle.

[0016] The beneficial effects of this invention are as follows: 1. The planetary wheel overmolding injection molding machine and overmolding method of the present invention, by setting a water-cooling plate at the bottom of the lower mold plate, and installing a heat dissipation plate and heat dissipation fins inside the water-cooling plate, and extending one end of the heat dissipation fins into the inner cavity of the water-cooling pipe, effectively increases the heat exchange contact area between the cooling water and the mold, shortens the heat conduction path, quickly removes the residual heat accumulated at the bottom of the mold cavity, enhances the overall heat exchange capacity, accelerates the cooling and solidification speed of the colloid, shortens the molding cycle, and improves production efficiency.

[0017] 2. The planetary wheel overmolding injection molding machine and overmolding method described in this invention, by setting a zigzag water-cooling cavity, the return water from the first drain pipe first enters the water-cooling cavity for buffering and heat dissipation, extending the return water flow path. In conjunction with the evenly arranged arc-shaped protrusions inside the water-cooling cavity, the water flow velocity is disturbed and the water flow contact heat dissipation area is increased, pre-cooling the high-temperature cooling water after use, and then returning it to the water-cooling box. This avoids the high temperature caused by the reuse of high-temperature water circulation, ensuring constant temperature circulation of cooling water. The water-cooling box integrates a serpentine connected air-cooling cavity and air-cooling channel, which, together with the forced air delivery of the fan, forms a circulating air-cooling heat dissipation system. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the column of the present invention; Figure 3 This is a schematic diagram of one part of the cylinder of the present invention; Figure 4 This is a schematic diagram of the lower template area of ​​the present invention; Figure 5 This is an exploded view of the rotating disk of the present invention; Figure 6 This is a schematic diagram of the heat sink of the present invention; Figure 7 This is a schematic diagram of the water-cooling pipe of the present invention; Figure 8 yes Figure 7 A magnified view of a section at point A in the middle; Figure 9 This is a schematic diagram of the top plate of the present invention; Figure 10 This is a cross-sectional view of the fixing seat of the present invention; Figure 11 yes Figure 10 A magnified view of a section at point B in the middle; Figure 12 This is a schematic diagram of the water-cooled box of the present invention; Figure 13 This is a cross-sectional view of the water-cooled cavity of the present invention; Figure 14 This is a cross-sectional view of the air-cooling channel of the present invention.

[0020] In the diagram: 1. Workbench; 2. Column; 3. Cylinder 1; 4. Mounting Plate 1; 5. Mounting Plate 2; 6. Glue Injection Cylinder; 7. Upper Template; 8. Positioning Rod; 9. Glue Injection Tube; 10. Cylinder 2; 11. Arc Plate; 12. Fixing Base; 13. Marking Strip; 14. Motor; 15. Spur Gear; 16. Rotating Disc; 17. Water-Cooling Plate; 18. Lower Template; 19. Gear Ring; 20. Positioning Hole; 21. Heat Dissipation Slot; 22. Clearance Column; 23. Water-Cooling Pipe; 24. Connecting Pipe 1; 25. Connecting Pipe 2; 26. Arc Groove; 27. Heat Dissipation Plate; 28. Heat Dissipation Fin 1; 29. Clearance hole; 30. Limiting rod; 31. Top plate; 32. Spring; 33. Ejector pin; 34. Water inlet pipe; 35. Water outlet pipe; 36. Water inlet chamber; 37. Water outlet chamber; 38. Water-cooled box; 39. Liquid storage tank; 40. Water supply pipe one; 41. Water supply pipe two; 42. Water pump one; 43. Water pump two; 44. Water suction pipe one; 45. Water suction pipe two; 46. Drain pipe one; 47. Drain pipe two; 48. Fan; 49. Water-cooled chamber; 50. Arc-shaped protrusion; 51. Air-cooled chamber; 52. Heat dissipation fin two; 53. Air-cooled channel; 54. Air inlet; 55. Air outlet. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1-14 As shown in the figure, a planetary gear overmolding injection molding machine according to an embodiment of the present invention includes a worktable 1, a column 2 fixedly connected to one side of the worktable 1, a lifting injection mechanism provided on the column 2, a fixed seat 12 fixedly connected to the top of the worktable 1, a rotating disk 16 rotatably connected to the top of the fixed seat 12, a water-cooled plate 17 fixedly connected to the top of the rotating disk 16, a lower template 18 fixedly connected to the top of the water-cooled plate 17, water-cooled pipes 23 arranged inside the water-cooled plate 17, a heat dissipation and heat conduction mechanism provided between the water-cooled pipes 23 and the lower template 18, a water-cooled box 38 provided on one side of the worktable 1, the water-cooled pipes 23 forming a closed circulation water circuit with the water-cooled box 38 through a water circulation mechanism, and the worktable 1 driving the rotating disk 16 to rotate through a rotation drive mechanism. The heat dissipation and heat conduction mechanism includes a heat dissipation plate 27 and heat dissipation fins 28. A plurality of heat dissipation grooves 21 are evenly opened on the water-cooled plate 17. A water-cooled pipe 23 is fixedly connected to the bottom of the heat dissipation groove 21. A plurality of arc-shaped grooves 26 are evenly opened on the top of the water-cooled pipe 23. A heat dissipation plate 27 is fixedly connected to the top of the inner wall of the heat dissipation groove 21. The top of the heat dissipation plate 27 is in contact with the bottom of the lower template 18. A heat dissipation fin 28 is fixedly connected to the bottom of the heat dissipation plate 27. The heat dissipation fin 28 extends through the arc-shaped grooves 26 into the inner cavity of the water-cooled pipe 23. A plurality of vertical grooves are evenly opened on the heat dissipation fin 28. The water circulation mechanism includes a water pump 42, which is fixedly installed on the water-cooled box 38. A water inlet chamber 36 is formed inside the water-cooled plate 17, and a water outlet chamber 37 is formed inside the rotating disk 16. Connecting pipe 24 and connecting pipe 25 are fixedly connected to both ends of the water-cooled pipe 23, respectively. The end of connecting pipe 24 away from the water-cooled pipe 23 extends into the water inlet chamber 36, and the end of connecting pipe 25 away from the water-cooled pipe 23 extends into the water outlet chamber 37. A water inlet pipe 34 is rotatably connected inside the water inlet chamber 36, and a water delivery pipe 40 is fixedly connected to the end of the water inlet pipe 34 away from the water inlet chamber 36. The fixed base 12 is embedded with a water outlet pipe 35. The top end of the water outlet pipe 35 is rotatably connected to the water outlet cavity 37. The end of the water outlet pipe 35 away from the water outlet cavity 37 is fixedly connected to a drain pipe 46. The water pump 42 is connected to the water supply pipe 40. The water pump 42 is connected to a suction pipe 44. The end of the suction pipe 44 away from the water pump 42 extends to the bottom of the inner cavity of the water-cooled box 38. The end of the drain pipe 46 away from the water outlet pipe 35 is connected to the inner cavity of the water-cooled box 38. The water-cooled box 38 is equipped with an air-cooled heat dissipation component. A cleaning and replenishment component is provided on one side of the water-cooled box 38. The air-cooled heat dissipation assembly includes a fan 48. The fan 48 is fixedly installed on the outer wall of the water-cooled box 38. A water-cooling cavity 49 is formed inside the water-cooled box 38. The water-cooling cavity 49 is zig-shaped. The drain pipe 46 is connected to the water-cooling cavity 49. Several arc-shaped protrusions 50 are evenly provided on the inner wall of the water-cooling cavity 49. The bottom end of the water-cooling cavity 49 is connected to the inner cavity of the water-cooled box 38. Several air-cooling cavities 51 are evenly provided inside the water-cooled box 38. The air-cooling cavities 51 are isosceles trapezoidal in shape. Heat dissipation fins 52 are fixed to both the top and bottom. Several air cooling channels 53 are opened inside the water-cooled box 38. Two adjacent air cooling cavities 51 are connected by air cooling channels 53, and the air cooling cavities 51 and the air cooling channels 53 form a serpentine shape. An air inlet 54 is opened on the side wall of the water-cooled box 38. The air inlet 54 is connected to the air cooling cavity 51 located at the bottom. An air outlet 55 is opened on the top of the water-cooled box 38. The air outlet 55 is connected to the air cooling channels 53. The fan 48 is adapted to the air inlet 54. This application takes into account that the existing water-cooling structure in the planetary wheel overmolding injection molding machine relies solely on the indirect heat conduction between the outer wall of the water-cooling channel and the mold steel plate. The heat at the bottom of the mold cavity needs to penetrate the mold steel plate layer by layer to be transferred to the cooling water, resulting in a long heat conduction path, low heat exchange efficiency, and an extended overall cooling and setting time to ensure the curing and setting of the colloid. This significantly lengthens the single injection molding cycle and limits the mass production capacity of the vertical turntable multi-station equipment. To address this, this application sets a water-cooling plate 17 at the bottom of the lower mold plate 18, and installs a heat dissipation plate 27 and heat dissipation fins 28 inside the water-cooling plate 17. The ends of the heat dissipation fins 28 are extended into the inner cavity of the water-cooling pipe 23. This effectively increases the heat exchange contact area between the cooling water and the mold, shortens the heat conduction path, quickly removes the residual heat accumulated at the bottom of the mold cavity, enhances the overall heat exchange capacity, accelerates the cooling and setting speed of the colloid, shortens the molding cycle, and improves production efficiency. It should be noted that the heat dissipation grooves 21 on the water-cooled plate 17 correspond one-to-one with the mold cavities on the lower template 18, and the heat dissipation plate 27 is attached to the bottom of the mold cavity, which can quickly conduct heat in the mold cavity to the water-cooling pipe 23. By setting a zigzag water-cooling cavity 49, the return water from the drain pipe 46 first enters the water-cooling cavity 49 for buffering and heat dissipation, extending the return water flow path. With the evenly arranged arc-shaped protrusions 50 inside the water-cooling cavity 49, the water flow velocity is disturbed and the water flow contact heat dissipation area is increased, pre-cooling the high-temperature cooling water after use, and then returning it to the water-cooling box 38. This avoids the high temperature caused by the reuse of high-temperature water circulation and ensures constant temperature circulation of cooling water. The water-cooling box 38 integrates a serpentine connected air-cooling cavity 51 and an air-cooling channel 53, which, together with the fan 48 for forced air delivery, form a circulating air-cooling heat dissipation system. Through the isosceles trapezoidal air-cooling cavity 51 and the heat dissipation fins 52 arranged on the upper and lower parts, the air heat exchange surface is expanded. The zigzag water-cooling cavity 49 is assisted by air cooling to quickly remove excess heat from the water. In addition, the end of the inlet pipe 34 away from the inlet cavity 36 extends from the inside to the outside of the outlet pipe 35. The part of the outlet pipe 35 located in the fixed base 12 and the rotating disk 16 is an annular pipe, which can ensure that it is embedded and fixed in the fixed base 12, and can rotate with the outlet cavity 37 without interfering with the inlet pipe 34. By adopting the rotating sealing connection structure of the inlet cavity 36, the outlet cavity 37 and the inlet pipe 34 and the outlet pipe 35, the cooling water circulation is uninterrupted under the continuous rotation of the rotating disk, the cooling conditions of multiple stations are consistent, and the quality uniformity of batch products is strong. By opening the vertical groove on the heat dissipation fin 28, the water flow state inside the water-cooling pipe 23 is disturbed, so that the cooling water forms turbulent disturbance, avoiding the problem of water flow sticking to the wall and insufficient heat exchange; improving the heat exchange rate, cooling faster and heat dissipation more evenly.

[0023] The cleaning and replenishing fluid assembly includes a storage tank 39. The storage tank 39 is located on one side of the water-cooled box 38. A second water pump 43 is fixedly installed on the top of the storage tank 39. A second water delivery pipe 41 is fixedly connected to the end of the inlet pipe 34 away from the inlet chamber 36. A second drain pipe 47 is fixedly connected to the end of the outlet pipe 35 away from the outlet chamber 37. Valves are fixedly installed on the first water delivery pipe 40, the second water delivery pipe 41, the first drain pipe 46, and the second drain pipe 47. The end of the second water delivery pipe 41 away from the inlet pipe 34 is connected to the second water pump 43. A second water suction pipe 45 is connected to the second water pump 43. The end of the second water suction pipe 45 away from the second water pump 43 extends into the inner cavity of the storage tank 39. It should also be noted that by adding a liquid storage tank 39, a second water pump 43, and supporting pipelines, and cooperating with multiple valves to switch water circuit modes, cleaning fluid can be independently delivered to the inside of the water-cooled pipe 23 during equipment shutdown. This allows for soaking and flushing of the inner wall of the water-cooled pipe 23, the surface of the heat dissipation fins, and the entire circulating water circuit, effectively softening and removing accumulated scale and impurities. Pipeline descaling and maintenance can be completed without disassembling the mold and water-cooling components. The cleaning coverage is comprehensive and the operation is convenient. In addition, the production cooling and pipeline cleaning circuits are independently controllable and do not interfere with each other. This ensures that the water-cooled pipe 23 remains unobstructed and the heat dissipation structure remains clean for a long time, maintaining stable mold cooling efficiency, reducing uneven cooling, product defects, and pipeline corrosion caused by scaling, reducing equipment maintenance costs and downtime, and effectively improving equipment lifespan and mass production stability.

[0024] The lifting and dispensing mechanism includes a cylinder 3 and a dispensing cylinder 6. The cylinder 3 is fixedly installed on the column 2. The output end of the cylinder 3 is fixedly connected to a mounting plate 4. The bottom of the mounting plate 4 is fixedly connected to a mounting plate 5. The bottom of the mounting plate 5 is fixedly connected to an upper template 7. The top of the mounting plate 4 is fixedly connected to the dispensing cylinder 6. The bottom end of the dispensing cylinder 6 is fixedly connected to a dispensing pipe 9. The end of the dispensing pipe 9 away from the dispensing cylinder 6 extends into the inner cavity of the upper template 7. The bottom of the upper template 7 is evenly provided with several dispensing holes. The mounting plate 4 and the mounting plate 5 are slidably connected to the side wall of the column 2. The rotary drive mechanism includes a motor 14. The motor 14 is fixedly installed on one side of the worktable 1. A spur gear 15 is fixedly connected to the output end of the motor 14. A gear ring 19 is fixedly connected to the outer wall of the lower template 18. The spur gear 15 and the gear ring 19 are meshed and connected. A marking protrusion 13 is provided on the outer wall of the fixed seat 12. A cylinder 2 10 is fixedly installed on one side of the worktable 1. An arc plate 11 is fixedly connected to the output end of the cylinder 2 10. A positioning protrusion is provided on both sides of the arc plate 11. The top of the rotating disk 16 is uniformly fixed with several sets of limiting rods 30. Each set of limiting rods 30 is slidably connected to a top plate 31. The top plate 31 is symmetrically provided with two positioning protrusions II, which are adapted to the positioning protrusions I. The top of the top plate 31 is uniformly fixed with several ejector pins 33, which are adapted to the lower template 18. A spring 32 is fixed between the top of the top plate 31 and the top of the limiting rods 30. The bottom of the mounting plate 25 is symmetrically fixed with two positioning rods 8, which are stepped rods. The lower template 18 is evenly provided with a plurality of positioning holes 20, which are stepped holes and are adapted to the positioning rods 8. The heat dissipation plate 27 is evenly provided with a plurality of clearance holes 29. The heat dissipation groove 21 is evenly fixed with a plurality of clearance posts 22, which are adapted to the ejector pins 33. It should be further explained that the lower template 18 is driven to rotate smoothly and change position through the meshing transmission of motor 14, spur gear 15 and gear ring 19, realizing automatic switching of multiple workstations and a high degree of automation. The marking protrusion 13 on the fixed seat 12 makes it easy for workers to clearly identify the position of the loading station. The arc plate 11 driven by cylinder 2 10 cooperates with the limit rod 30, top plate 31, spring 32 and ejector pin 33 to form an elastic ejection structure. The ejection process is buffered and gentle, and the force is even, which facilitates the automatic demolding and material removal of the workpiece and avoids workpiece adhesion, pressure damage and colloid shedding. It is also worth noting that the glue injection cylinder 6, glue injection tube 9, and multiple sets of glue injection holes work together to achieve uniform and stable injection of the glue into the mold cavity of the lower mold plate 18, improving the uniformity of the planetary wheel coating molding. The upper mold plate 7 slides and rises along the column 2, with smooth and reliable movement. The positioning rod 8 with the stepped rod structure and the stepped positioning hole 20 on the lower mold plate 18 achieve precise insertion and fit, effectively improving the mold closing accuracy, preventing mold plate misalignment and displacement, and reducing problems such as overflow and product eccentricity. At the same time, avoidance holes 29 and avoidance pillars 22 are set at the heat dissipation plate 27 and heat dissipation groove 21 corresponding to the ejector pin 33 to reasonably avoid the demolding action, avoid interference and friction between the ejector pin 33 and the heat dissipation and heat conduction mechanism, ensure smooth demolding action, and protect the heat dissipation and heat conduction mechanism from damage and instability.

[0025] A method for overmolding a planetary gear, applicable to the aforementioned planetary gear overmolding injection molding machine, comprising the following steps: S1: Place the planetary wheel metal cores into the cavity of the lower template 18 in sequence. Drive the gear ring 19 through the motor 14 to rotate the rotating disk 16 and the lower template 18 to change positions until the mold cavity with the planetary wheel metal cores rotates to the bottom of the upper template 7. Start the cylinder 3 to drive the upper template 7 to move down as a whole. Use the positioning rod 8 and the positioning hole 20 to guide and limit the movement. The upper template 7 and the lower template 18 fit together precisely and close, ensuring accurate cavity alignment. S2: After the mold is closed, the molten rubber in the injection cylinder 6 is evenly injected into the mold cavity of the lower mold plate 18 through the injection pipe 9 and injection hole, and the ring-shaped rubber filling is completed on the outer circumference of the metal wheel core. The cooling water is circulated in a closed loop through the water cooling pipe 23 by the water pump 42. The heat exchange is enhanced by the heat dissipation plate 27 attached to the bottom of the mold cavity and the heat dissipation fins 28 with vertical grooves extending into the water channel, and the heat is quickly and evenly removed. The return water is cooled by secondary heat dissipation through the zigzag water cooling cavity 49, the air cooling cavity 51 and the heat dissipation fins 52, and the temperature is continuously kept constant, so that the rubber body can quickly set and shrink evenly. S3: During demolding and material removal, cylinder 13 drives the upper mold plate 7 to move upward to open the mold, and motor 14 drives the lower mold plate 18 to rotate to the arc plate 11, so that the top plate 31 is aligned with the arc plate 11. Cylinder 210 drives the arc plate 11 to slide upward, so that the top plate 31 drives the ejector pin 33 to perform an ejection action, lifting the formed planetary wheel workpiece. The finished product is then manually removed, and the ejector pin 33 automatically resets and enters the next injection molding cycle.

[0026] Working principle: When this equipment is working, the planetary wheel metal core to be coated is first placed inside the cavity of the lower mold plate 18. The motor 14, through the meshing of the gear ring 19 with the spur gear 15, drives the rotating disk 16, the water-cooling plate 17 and the lower mold plate 18 to rotate as a whole. During the mold closing stage, the cylinder 3 on the outside of the column 2 drives the mounting plate 4 and the mounting plate 5 to slide down vertically along the column 2, driving the upper mold plate 7 to move down. The positioning rod 8 at the bottom of the mounting plate 5 is precisely inserted into the stepped hole of the lower mold plate 18 to achieve guiding alignment and axial limitation, ensuring that the upper mold plate 7 and the lower mold plate 18 are accurately closed and tightly sealed. During the plasticizing and injection process, the molten rubber inside the injection cylinder 6 is transported to the inside of the upper mold plate 7 through the injection pipe 9 and evenly distributed. The injection holes are designed to inject glue into the closed mold cavity at multiple points, completing the glue filling operation on the outer periphery of the planetary wheel. During the cooling and shaping stage, the cooling water in the water-cooling box 38 is drawn by the water pump 42, introduced into the water inlet cavity 36 through the water delivery pipe 40 and the water inlet pipe 34, and then flows into the water-cooling pipe 23 through multiple sets of connecting pipes 24. The cooling water flows through the heat dissipation fins 28 at the bottom of the heat dissipation plate 27 that extend into the inner cavity of the water-cooling pipe 23. The heat dissipation plate 27 is in close contact with the bottom of the lower mold plate 18, which can quickly absorb the heat of the mold cavity. The vertical grooves on the surface of the heat dissipation fins 28 disturb the water flow, increase the heat exchange area, enhance the heat exchange efficiency, and quickly remove the heat. The hot water after heat exchange flows into the water outlet cavity 37 through the connecting pipe 25, and then flows into the water-cooling box through the water outlet pipe 35 and the drain pipe 46. The zigzag water-cooling cavity 49 inside the water-cooling box 38 has an arc-shaped protrusion 50 that disrupts the water flow and extends the heat dissipation path. Simultaneously, the fan 48 inside the water-cooling box 38, in conjunction with the serpentine air-cooling cavity 51 and the second heat dissipation fin 52, forms a forced air-cooling structure, providing secondary cooling for the circulating water. The cooled water then flows back to the water-cooling box 38, achieving a closed-loop circulation of cooling water for continuous heat dissipation. During demolding, cylinder 1 3 drives the upper mold plate 7 upward to open the mold, and motor 14 drives the lower mold plate 18 to rotate to the arc-shaped plate 11, aligning the top plate 31 with the arc-shaped plate 11. Cylinder 2 10 drives the arc-shaped plate 11 to slide upward, causing the top plate 31 to drive the ejector pin 33 to perform an ejection action, lifting the formed planetary wheel workpiece for easy manual removal. During this process, the spring... 32 is compressed by the top plate 31; after being ejected, cylinder 2 10 drives the arc plate 11 to slide down and reset. The spring force of spring 32 drives the top plate 31 and ejector pin 33 to automatically reset. When the equipment needs maintenance and descaling for long-term use, the valves on the water supply pipe 1 40 and the drain pipe 1 46 and the water pump 1 42 can be closed, the water pump 2 43 matched with the liquid storage tank 39 can be turned on, and the valves on the water supply pipe 2 41 and the drain pipe 2 47 can be opened. The cleaning fluid is delivered to the water inlet chamber 36 and the water cooling pipe 23 through the water supply pipe 2 41. The cleaning fluid circulates through the inner wall of the water cooling pipe 23 and the surface of the heat dissipation fins 1 28 to soften and flush away the scale and impurities inside the pipe. Water circuit maintenance can be completed without disassembling the machine, and the long-term heat exchange stability of the cooling system can be continuously guaranteed.

[0027] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0028] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A planetary wheel overmolding injection molding machine, characterized in that: The workbench (1) includes a column (2) fixedly connected to one side of the workbench (1), a lifting and dispensing mechanism on the column (2), a fixed seat (12) fixedly connected to the top of the workbench (1), a rotating disk (16) rotatably connected to the top of the fixed seat (12), a water-cooled plate (17) fixedly connected to the top of the rotating disk (16), a lower template (18) fixedly connected to the top of the water-cooled plate (17), water-cooled pipes (23) arranged inside the water-cooled plate (17), a heat dissipation and heat conduction mechanism between the water-cooled pipes (23) and the lower template (18), a water-cooled box (38) set on one side of the workbench (1), the water-cooled pipes (23) forming a closed loop with the water-cooled box (38) through a water circulation mechanism, and the workbench (1) is driven by a rotation drive mechanism, which can drive the rotating disk (16) to rotate.

2. The planetary wheel overmolding injection molding machine according to claim 1, characterized in that: The lifting and dispensing mechanism includes a cylinder (3) and a dispensing cylinder (6). The cylinder (3) is fixedly installed on the column (2). The output end of the cylinder (3) is fixedly connected to a mounting plate (4). The bottom of the mounting plate (4) is fixedly connected to a mounting plate (5). The bottom of the mounting plate (5) is fixedly connected to an upper template (7). The top of the mounting plate (4) is fixedly connected to a dispensing cylinder (6). The bottom end of the dispensing cylinder (6) is fixedly connected to a dispensing pipe (9). The end of the dispensing pipe (9) away from the dispensing cylinder (6) extends into the inner cavity of the upper template (7). The bottom of the upper template (7) is evenly provided with several dispensing holes. The mounting plate (4) and the mounting plate (5) are both slidably connected to the side wall of the column (2).

3. The planetary wheel overmolding injection molding machine according to claim 2, characterized in that: The heat dissipation and heat conduction mechanism includes a heat dissipation plate (27) and heat dissipation fins (28). A plurality of heat dissipation grooves (21) are evenly provided on the water cooling plate (17). A water cooling pipe (23) is fixedly connected to the bottom of the heat dissipation groove (21). A plurality of arc-shaped grooves (26) are evenly provided on the top of the water cooling pipe (23). A heat dissipation plate (27) is fixedly connected to the top of the inner wall of the heat dissipation groove (21). The top of the heat dissipation plate (27) is in contact with the bottom of the lower template (18). A heat dissipation fins (28) are fixedly connected to the bottom of the heat dissipation plate (27). The heat dissipation fins (28) extend through the arc-shaped grooves (26) into the inner cavity of the water cooling pipe (23). A plurality of vertical grooves are evenly provided on the heat dissipation fins (28).

4. The planetary wheel overmolding injection molding machine according to claim 3, characterized in that: The water circulation mechanism includes a water pump (42), which is fixedly installed on the water-cooled box (38). A water inlet chamber (36) is provided inside the water-cooled plate (17), and a water outlet chamber (37) is provided inside the rotating disk (16). Connecting pipes 1 (24) and 2 (25) are fixedly connected to both ends of the water-cooled pipe (23). The end of connecting pipe 1 (24) away from the water-cooled pipe (23) extends into the water inlet chamber (36), and the end of connecting pipe 2 (25) away from the water-cooled pipe (23) extends into the water outlet chamber (37). A water inlet pipe (34) is rotatably connected inside the water inlet chamber (36), and a water delivery pipe (4) is fixedly connected to the end of the water inlet pipe (34) away from the water inlet chamber (36). 0), the fixed base (12) is inlaid with a water outlet pipe (35), the top end of the water outlet pipe (35) is rotatably connected to the water outlet cavity (37), the end of the water outlet pipe (35) away from the water outlet cavity (37) is fixedly connected to a drain pipe (46), the water pump (42) is connected to the water delivery pipe (40), the water pump (42) is connected to a pumping pipe (44), the end of the pumping pipe (44) away from the water pump (42) extends to the bottom of the inner cavity of the water-cooled box (38), the end of the drain pipe (46) away from the water outlet pipe (35) is connected to the inner cavity of the water-cooled box (38), the water-cooled box (38) is provided with an air-cooled heat dissipation component, and a cleaning and replenishing component is provided on one side of the water-cooled box (38).

5. A planetary gear overmolding injection molding machine according to claim 4, characterized in that: The air-cooled heat dissipation assembly includes a fan (48). The fan (48) is fixedly installed on the outer wall of the water-cooled box (38). A water-cooled cavity (49) is opened inside the water-cooled box (38). The water-cooled cavity (49) is zig-shaped. The drain pipe (46) is connected to the water-cooled cavity (49). Several arc-shaped protrusions (50) are evenly provided on the inner wall of the water-cooled cavity (49). The bottom end of the water-cooled cavity (49) is connected to the inner cavity of the water-cooled box (38). Several air-cooled cavities (51) are evenly opened inside the water-cooled box (38). The air-cooled cavity (51) is in the shape of an isosceles trapezoid. The top of the air-cooled cavity (51) is... The top and bottom are both fixed with heat dissipation fins (52). The water-cooled box (38) has several air-cooling channels (53). Two adjacent air-cooling cavities (51) are connected by air-cooling channels (53), and the air-cooling cavities (51) and air-cooling channels (53) form a serpentine shape. The side wall of the water-cooled box (38) has an air inlet (54), which is connected to the air-cooling cavity (51) located at the bottom. The top of the water-cooled box (38) has an air outlet (55), which is connected to the air-cooling channel (53). The fan (48) is adapted to the air inlet (54).

6. The planetary wheel overmolding injection molding machine according to claim 5, characterized in that: The cleaning and replenishing component includes a storage tank (39). The storage tank (39) is provided on one side of the water-cooled box (38). A second water pump (43) is fixedly installed on the top of the storage tank (39). A second water delivery pipe (41) is fixedly connected to one end of the inlet pipe (34) away from the inlet chamber (36). A second drain pipe (47) is fixedly connected to one end of the outlet pipe (35) away from the outlet chamber (37). Valves are fixedly installed on the first water delivery pipe (40), the second water delivery pipe (41), the first drain pipe (46), and the second drain pipe (47). The end of the second water delivery pipe (41) away from the inlet pipe (34) is connected to the second water pump (43). A second water suction pipe (45) is connected to the second water pump (43). The end of the second water suction pipe (45) away from the second water pump (43) extends into the inner cavity of the storage tank (39).

7. A planetary wheel overmolding injection molding machine according to claim 6, characterized in that: The rotary drive mechanism includes a motor (14). The motor (14) is fixedly installed on one side of the worktable (1). A spur gear (15) is fixedly connected to the output end of the motor (14). A toothed ring (19) is fixedly connected to the outer wall of the lower template (18). The spur gear (15) meshes with the toothed ring (19). A marking protrusion (13) is provided on the outer wall of the fixed seat (12). A cylinder two (10) is fixedly installed on one side of the worktable (1). An arc plate (11) is fixedly connected to the output end of the cylinder two (10). A positioning protrusion is provided on both sides of the arc plate (11).

8. A planetary wheel overmolding injection molding machine according to claim 7, characterized in that: The top of the rotating disk (16) is uniformly fixed with several sets of limiting rods (30), and a top plate (31) is slidably connected to each set of limiting rods (30). Two positioning protrusions are symmetrically provided on the top plate (31), and the positioning protrusions are adapted to the positioning protrusions. Several ejector pins (33) are uniformly fixed to the top of the top plate (31), and the ejector pins (33) are adapted to the lower template (18). A spring (32) is fixed between the top of the top plate (31) and the top of the limiting rods (30).

9. A planetary wheel overmolding injection molding machine according to claim 8, characterized in that: The bottom of the mounting plate 2 (5) is symmetrically fixed with two positioning rods (8), the positioning rods (8) are stepped rods, the lower template (18) is evenly provided with a number of positioning holes (20), the positioning holes (20) are stepped holes, the positioning holes (20) are adapted to the positioning rods (8), the heat dissipation plate (27) is evenly provided with a number of clearance holes (29), the heat dissipation groove (21) is evenly fixed with a number of clearance columns (22), the clearance holes (29) and clearance columns (22) are adapted to the ejector pins (33).

10. A method for overcoating a planetary wheel, characterized in that: This overmolding method is applicable to a planetary wheel overmolding injection molding machine as described in claim 9, and the overmolding method includes the following steps: S1: Place the planetary wheel metal cores in the cavity of the lower template (18) in sequence. Drive the gear ring (19) through the motor (14) to drive the rotating disk (16) and the lower template (18) to rotate and change positions until the mold cavity with the planetary wheel metal cores rotates to the bottom of the upper template (7). Start the cylinder (3) to drive the upper template (7) to move down as a whole. Use the positioning rod (8) and the positioning hole (20) to guide and limit the movement. The upper template (7) and the lower template (18) fit together precisely and close, ensuring accurate alignment of the cavity. S2: After the mold is closed, the molten rubber in the injection cylinder (6) is evenly injected into the mold cavity of the lower mold plate (18) through the injection pipe (9) and injection hole, and the ring-shaped rubber filling is completed on the outer circumference of the metal wheel core. The cooling water is circulated in a closed loop in the water cooling pipe (23) by the water pump (42). The heat exchange is enhanced by the heat dissipation plate (27) attached to the bottom of the mold cavity and the heat dissipation fins (28) with vertical grooves extending into the water channel, and the heat is quickly and evenly removed. The return water is cooled by the zigzag water cooling cavity (49) and the air cooling cavity (51) and the heat dissipation fins (52) for secondary heat dissipation and cooling. The constant temperature cooling is maintained so that the rubber body can be quickly shaped and shrink evenly. S3: When demolding and removing material, cylinder one (3) drives the upper template (7) to move upward to open the mold, and motor (14) drives the lower template (18) to rotate to the arc plate (11), so that the top plate (31) is aligned with the arc plate (11). Cylinder two (10) drives the arc plate (11) to slide upward, so that the top plate (31) drives the ejector pin (33) to perform an ejection action, lifting the formed planetary wheel workpiece, manually removing the finished product, and then the ejector pin (33) automatically resets and enters the next injection molding cycle.

Images