An injection molding device for producing the housing of festival lights

Abstract

The present invention discloses an injection molding device for producing festival lamp housings, which relates to the technical field of injection molding. The injection molding device includes a left chassis, a right chassis, an installation gear ring, a hollow gear, several outer modules, several inner modules, a synchronous drive unit, at least one injection molding machine, and a water cooling component. The installation gear ring is arranged in the left chassis, the hollow gear is arranged in the right chassis, several of the outer modules are arranged on the installation gear ring, several of the inner modules are arranged on the hollow gear, the synchronous drive unit is installed at the upper ends of the left chassis and the right chassis, and at least one injection molding machine and the water cooling component are arranged in the left chassis. After the injection molding machine injects plastic into an injection cavity, the water cooling component cools the injection cavity. After the cooling is completed, the synchronous drive unit drives the injection cavity to rotate, rotates the outer modules and the inner modules to other positions for demolding, and prompts the next injection cavity to quickly start injection molding, thereby improving the working efficiency of the injection molding device.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and specifically to an injection molding device for producing festival lamp housings. Background Art

[0002] The lamp housings of festival lamps are usually manufactured by injection molding. The conventional injection molding method uses an opening and closing mold to form an injection cavity, fills the injection cavity with molten plastic, and then opens the mold to take out the injection-molded lamp housing after the plastic cools. The existing injection molding devices can produce multiple lamp housings each time the mold is opened, but the time required for the corresponding mold preheating and cooling is relatively long, consuming a long time; the preheating and cooling time of a single injection molding mold is much shorter than that of a general multi-cavity mold, but the manufacturing efficiency is not high and it is suitable for small-batch production. Therefore, there is no injection molding equipment on the market that can reduce the equipment preheating and cooling time and at the same time speed up the manufacturing speed. General injection molded parts will carry plastic strips remaining in the injection channels and require manual trimming, so improvements are needed. Summary of the Invention

[0003] The purpose of the present invention is to provide an injection molding device for producing festival lamp housings to solve the problems raised in the prior art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An injection molding device for producing festival lamp housings, including a left chassis, a right chassis, an installation gear ring, a hollow gear, several outer modules, several inner modules, a synchronous drive unit, at least one injection molding machine, and a water cooling component. The installation gear ring is arranged in the left chassis, the hollow gear is arranged in the right chassis, several outer modules are arranged on the installation gear ring, several inner modules are arranged on the hollow gear, the synchronous drive unit is installed at the upper ends of the left chassis and the right chassis, and at least one injection molding machine and the water cooling component are arranged in the left chassis.

[0005] Further, the synchronous drive unit includes a first gear, a second gear, a first motor, and a rotating shaft. The first motor is arranged on the right chassis, the rotating shaft is connected to the motor shaft of the first motor, the first gear and the second gear are installed on the rotating shaft, the first gear is meshed with the installation gear ring, the second gear is meshed with the hollow gear, the first motor drives the rotating shaft to rotate, the rotating shaft drives the first gear and the second gear to rotate synchronously, the first gear drives the installation gear ring to rotate, the installation gear ring drives the outer modules to rotate, the second gear drives the hollow gear, and the hollow gear drives the inner modules to rotate. Each outer module corresponds to each inner module one by one. After the outer module and the inner module are combined to form an injection cavity, after the injection molding machine injects plastic into an injection cavity, when the water cooling component cools the injection cavity, after the cooling is completed, the synchronous drive unit drives the injection cavity to rotate, rotates the outer module and the inner module to other positions for demolding, and promotes the next injection cavity to start injection quickly, improving the working efficiency of the injection molding device.

[0006] Furthermore, each of the outer modules includes a water jacket, an inner mold cylinder, a core column, a pair of first electric push rods and a connecting plate. The water jacket is arranged on the inner ring of the installation gear ring. The inner mold cylinder is installed inside the water jacket. The core column is connected to the water jacket through the connecting plate. The core column is located in the middle of the inner mold cylinder. A pair of the first electric push rods are installed on the core column.

[0007] Furthermore, each of the outer modules further includes a demolding push plate, a rotating ring and a plurality of flow disturbance swirl plates. The demolding push plate is connected to the piston rods of the pair of first electric push rods. An injection hole is formed in the demolding push plate. The demolding push plate is slidably installed between the inner mold cylinder and the core column. The rotating ring is rotatably installed inside the water jacket. The plurality of flow disturbance swirl plates are annularly and evenly arranged on the rotating ring. An inlet hole is formed in one side of the water jacket close to the core column. An outlet hole is formed in the other side of the water jacket far from the core column. During injection molding, the piston rods of the first electric push rods retract to pull the demolding push plate to the tail position. The second electric push rod pushes the inner module into the inner mold cylinder. The moving module drives the injection molding machine to insert into the injection hole of the demolding push plate. After injection molding, the temperature sensor in the inner mold cylinder detects the heat of the molten plastic, so that the solenoid valve in this outer module is opened, and the water in the water tank is poured into the water jacket.

[0008] Furthermore, the water cooling assembly includes a water supply system, an inlet pipe, an outlet pipe, a water tank and a pressure maintaining valve. The water tank is arranged in the middle of several outer modules. A first inner groove communicated with the inlet hole is formed inside the water tank. A second inner groove communicated with the outlet hole is also formed inside the water tank. The first inner groove is communicated with the second inner groove. The pressure maintaining valve is arranged at the communication part of the first inner groove and the second inner groove. The water supply system is rotationally and sealingly connected to the first inner groove of the water tank through the inlet pipe. The water supply system is rotationally and sealingly connected to the second inner groove of the water tank through the outlet pipe. A temperature sensor is arranged inside the inner mold cylinder of each outer module. A solenoid valve is arranged at the inlet hole of each water jacket. A check valve is arranged at the outlet hole of the water jacket. The solenoid valve and the temperature sensor are connected to the control system through a circuit. The water supply system pours cooling water into the water tank through the inlet pipe. The pressure of the cooling water in the first inner groove rises. When the water pressure exceeds the overflow pressure of the pressure maintaining valve, the cooling water flows into the second inner groove through the pressure maintaining valve and finally flows out through the outlet pipe. Through the setting of the pressure maintaining valve, a certain water pressure is maintained in the first inner groove for the cooling of the outer module. When the cooling water enters the water jacket through the solenoid valve, the pressure energy of the water will push the flow disturbance swirl plates to move, so that the rotating ring and the plurality of flow disturbance swirl plates rotate inside the water jacket, and the cooling water flow is evenly diffused to the outside of the inner mold cylinder to realize the cooling of the injection molded part. The heat-absorbing cooling water flows into the second inner groove through the check valve at the outlet hole. Through the setting of the rotating ring and the plurality of flow disturbance swirl plates, the cooling water flows and diffuses more evenly on the outside of the injection molded part, enhancing the overall heat absorption and cooling effect and realizing the rapid cooling of the injection molded part.

[0009] Further, an installation frame is provided on the side of the hollow gear away from the left chassis. Each group of the inner modules includes a pair of second electric push rods, a box cover, a positioning plate, several adjusting inner molds and several driven inner molds. The pair of second electric push rods are arranged on the installation frame. The box cover is connected to the piston rods of the pair of second electric push rods. The positioning plate is installed on the side of the box cover away from the second electric push rods. The several adjusting inner molds and driven inner molds are slidably installed on the side of the positioning plate away from the box cover. When the temperature sensor inside the inner mold cylinder detects that the overall temperature of the injection-molded lamp housing has decreased and the molten plastic has reached the solidification temperature, the electromagnetic valve is closed through the control system to block the continuous inflow of cooling water into the water jacket. The cooling water remaining in the water jacket continues to absorb the residual heat of the lamp housing to prevent the temperature of the inner mold cylinder from completely cooling, which plays an effect of enhancing the fluidity of the molten plastic during subsequent injection molding.

[0010] Further, the several adjusting inner molds and driven inner molds are all arranged in a circular and evenly distributed manner. The adjusting inner molds and the driven inner molds are arranged at intervals. A round pin is provided on the side of each adjusting inner mold close to the positioning plate. A slider is provided on the side of each driven inner mold close to the positioning plate. Several straight-head chutes and round-head chutes are formed on the positioning plate. The round pin is slidably arranged in the round-head chute. The slider is installed in the straight-head chute. A return spring is arranged between each slider and the straight-head chute. Before injection molding, the second electric push rod pushes the inner module into the inner mold cylinder. The second motor drives the driving bevel gear to rotate. The driving bevel gear drives the bevel gear indexing plate to rotate. The inclined chute on the bevel gear indexing plate pushes the round pin to move. All the adjusting inner molds move outward. All the driven inner molds also move outward under the action of the adjusting inner molds. The adjusting inner molds and the driven inner molds enclose the inner wall of the lamp housing.

[0011] Further, each group of the inner modules further includes a second motor, a driving bevel gear and a bevel gear indexing plate. The second motor is installed inside the box cover through a bracket. The driving bevel gear is installed on the motor shaft of the second motor. The bevel gear indexing plate is rotatably installed on the side of the positioning plate close to the box cover. The bevel gear indexing plate is meshed and connected with the driving bevel gear. An inclined chute is formed on the bevel gear indexing plate. The round pin is slidably connected with the inclined chute. When demolding is required, the bevel gear indexing plate rotates in reverse to move the adjusting inner molds inward. Under the action of the return spring, all the driven inner molds also move inward to close up, so that the adjusting inner molds and the driven inner molds are separated from the inner wall of the lamp housing. Then the second electric push rod retracts the inner module. The first electric push rod pushes the demolding push plate to the outside of the inner mold cylinder to push the lamp housing out of the inner mold cylinder. Under the action of gravity, the lamp housing is separated from the demolding push plate and falls off the device. The lamp housing falls onto the conveyor belt below the device and moves to the next processing procedure.

[0012] Further, at least one of the injection molding machines is installed in the left chassis through a moving module. Each injection molding machine includes an injection barrel, a feeding screw, a feeding pipe, and a third motor. The injection barrel is connected to the moving module. Electric heating wires are installed in the inner wall of the injection barrel. The feeding screw is rotatably installed inside the injection barrel. The motor shaft of the third motor penetrates the injection barrel and is connected to the feeding screw. The feeding pipe is connected to one side of the injection barrel close to the third motor. The moving module docks the end of the injection barrel with the injection hole on the demolding push plate, and the molten plastic is extruded into the injection cavity formed by the outer module and the inner mold by using the feeding screw.

[0013] Further, the inside of the feeding screw is hollow. A closing pin is slidably installed inside the feeding screw. An inner spring is connected between the closing pin and the inside of the feeding screw. An electromagnet is also arranged inside the feeding screw. The electromagnet is circuit-connected to the control system. After the injection cavity is filled, the electromagnet is energized to attract the closing pin towards the end of the injection barrel, so that the closing pin cuts off the inside of the injection barrel from the injection cavity, thereby avoiding caking in the injection channel and avoiding protruding plastic columns remaining on the outer surface of the lamp housing.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] After the injection molding machine injects plastic into an injection cavity, wait for the water cooling component to cool the injection cavity. After cooling is completed, the synchronous drive unit drives the injection cavity to rotate, rotates the outer module and the inner module to other positions for demolding, and prompts the next injection cavity to start injection quickly, improving the working efficiency of the injection device.

[0016] Through the setting of the rotating ring and several flow disturbance rotating plates, the cooling water flows and diffuses more evenly on the outside of the injection molded part, enhancing the overall heat absorption and cooling effect, realizing the rapid cooling of the injection molded part. The cooling water remaining in the water jacket continues to absorb the residual heat of the lamp housing, preventing the temperature of the inner mold cylinder from completely cooling, and playing an effect of enhancing the fluidity of the molten plastic during subsequent injection.

[0017] By setting the closing pin, after injection molding is completed, the electromagnet is used to adsorb the closing pin, so that the closing pin cuts off the inside of the injection barrel from the injection cavity, thereby avoiding caking in the injection channel and avoiding protruding plastic columns remaining on the outer surface of the lamp housing, achieving the effect of avoiding manual trimming again. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall external structure of the present invention;

[0019] Figure 2 is a schematic diagram of the overall internal structure of the present invention;

[0020] Figure 3 is a schematic diagram of the installation structure of the outer module part of the present invention;

[0021] Figure 4 It is a schematic structural diagram of the inside of the water jacket of the present invention;

[0022] Figure 5 It is a schematic installation structure diagram of the inner module part of the present invention;

[0023] Figure 6 It is a schematic structural diagram of the inside of the box cover of the present invention;

[0024] Figure 7 It is a schematic connection structure diagram of the inner module of the present invention;

[0025] Figure 8 It is a schematic structural diagram of the inside of the injection molding machine of the present invention.

[0026] In the figure: 1, left chassis; 2, right chassis; 3, first gear; 4, second gear; 5, mounting bracket; 6, first motor; 7, mounting gear ring; 8, hollow gear; 9, outer module; 10, inner module; 11, water tank; 12, water jacket; 13, rotating ring; 14, turbulence swirling plate; 15, inner mold cylinder; 16, core column; 17, first electric push rod; 18, demolding push plate; 19, second electric push rod; 20, box cover; 21, second motor; 22, driving bevel gear; 23, bevel gear modification disk; 24, positioning plate; 25, adjusting inner mold; 26, driven inner mold; 27, return spring; 28, injection barrel; 29, third motor; 30, feeding screw; 31, inner spring; 32, closing pin; 33, feed pipe; 34, connecting plate; 35, rotating shaft. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment: As Figures 1-8 shown, the present invention provides a technical solution, an injection molding device for producing a festival lamp shell, including a left chassis 1, a right chassis 2, a mounting gear ring 7, a hollow gear 8, four outer modules 9, four inner modules 10, a synchronous driving unit, two injection molding machines, and a water cooling component. The mounting gear ring 7 is arranged in the left chassis 1, the hollow gear 8 is arranged in the right chassis 2, the four outer modules 9 are arranged on the mounting gear ring 7, the four inner modules 10 are arranged on the hollow gear 8, the synchronous driving unit is installed at the upper ends of the left chassis 1 and the right chassis 2, and the two injection molding machines and the water cooling component are arranged in the left chassis 1.

[0029] The synchronous drive unit includes a first gear 3, a second gear 4, a first motor 6 and a rotating shaft 35. The first motor 6 is arranged on the right chassis 2, and the rotating shaft 35 is connected to the motor shaft of the first motor 6. The first gear 3 and the second gear 4 are mounted on the rotating shaft 35. The first gear 3 is meshed and connected with the mounting gear ring 7, and the second gear 4 is meshed and connected with the hollow gear 8. The first motor 6 drives the rotating shaft 35 to rotate, the rotating shaft 35 drives the first gear 3 and the second gear 4 to rotate synchronously. The first gear 3 drives the mounting gear ring 7 to rotate, and the mounting gear ring 7 drives the outer module 9 to rotate. The second gear 4 drives the hollow gear 8, and the hollow gear 8 drives the inner module 10 to rotate. Each outer module 9 corresponds to each inner module 10 one by one. After the outer module 9 and the inner module 10 are clamped, an injection cavity is formed. After the injection molding machine injects plastic into an injection cavity, the water cooling component cools the injection cavity. After the cooling is completed, the synchronous drive unit drives the injection cavity to rotate, rotates the outer module 9 and the inner module 10 to other positions for demolding, and prompts the next injection cavity to start injection quickly, improving the working efficiency of the injection molding device.

[0030] Each outer module 9 includes a water jacket 12, an inner mold cylinder 15, a core column 16, a pair of first electric push rods 17 and a connecting plate 34. The water jacket 12 is arranged on the inner ring of the mounting gear ring 7. The inner mold cylinder 15 is installed inside the water jacket 12. The core column 16 is connected to the water jacket 12 through the connecting plate 34. The core column 16 is located in the middle of the inner mold cylinder 15. A pair of first electric push rods 17 are installed on the core column 16. Each outer module 9 further includes a demolding push plate 18, a rotating ring 13 and a plurality of flow disturbing rotating plates 14. The demolding push plate 18 is connected to the piston rods of the pair of first electric push rods 17. An injection hole is formed on the demolding push plate 18. The demolding push plate 18 is slidably installed between the inner mold cylinder 15 and the core column 16. The rotating ring 13 is rotatably installed inside the water jacket 12. A plurality of flow disturbing rotating plates 14 are annularly and evenly arranged on the rotating ring 13. An inlet hole is formed on one side of the water jacket 12 close to the core column 16, and an outlet hole is formed on the other side of the water jacket 12 far from the core column 16. During injection molding, the piston rods of the first electric push rods 17 retract, pulling the demolding push plate 18 to the tail position. The second electric push rod 19 pushes the inner module 10 into the inner mold cylinder 15. The moving module drives the injection molding machine to insert into the injection hole of the demolding push plate 18. After injection, the temperature sensor in the inner mold cylinder 15 detects the heat of the molten plastic, causing the solenoid valve in this outer module 9 to open, and the water in the water tank 11 is poured into the water jacket 12.

[0031] The water-cooling component (not shown in the figure) includes a water supply system, an inlet pipe, an outlet pipe, a water tank 11 and a pressure-maintaining valve. The water tank 11 is arranged in the middle of the four outer modules 9. A first inner groove communicating with the water inlet hole is opened inside the water tank 11, and a second inner groove communicating with the water outlet hole is also opened inside the water tank 11. The first inner groove is communicated with the second inner groove. The pressure-maintaining valve is arranged at the communicating place of the first inner groove and the second inner groove. The water supply system is rotationally and sealingly connected to the first inner groove of the water tank 11 through the inlet pipe, and the water supply system is rotationally and sealingly connected to the second inner groove of the water tank 11 through the outlet pipe; a temperature sensor is arranged inside the inner mold cylinder 15 of each outer module 9, an electromagnetic valve is arranged at the water inlet hole of each water jacket 12, and a check valve is arranged at the water outlet hole of the water jacket 12. The electromagnetic valve and the temperature sensor are connected to the control system through an electric circuit. The water supply system fills the water tank 11 with cooling water through the inlet pipe. The pressure of the cooling water in the first inner groove rises. When the water pressure exceeds the overflow pressure of the pressure-maintaining valve, the cooling water flows into the second inner groove through the pressure-maintaining valve and finally flows out through the outlet pipe. Through the setting of the pressure-maintaining valve, a certain water pressure is maintained in the first inner groove for the cooling of the outer module 9. When the cooling water enters the water jacket 12 through the electromagnetic valve, the water pressure energy will push the spoiler vane 14 to move, so that the rotating ring 13 and several spoiler vanes 14 rotate inside the water jacket 12, and the cooling water flow is evenly diffused to the outside of the inner mold cylinder 15 to realize the cooling of the injection molded part. The heat-absorbing cooling water flows into the second inner groove through the check valve at the water outlet hole. Through the setting of the rotating ring 13 and several spoiler vanes 14, the cooling water flows and diffuses more evenly on the outside of the injection molded part, enhancing the overall heat-absorbing and cooling effect and realizing the rapid cooling of the injection molded part.

[0032] On the side of the hollow gear 8 away from the left chassis 1, there is an installation frame 5. Each set of inner modules 10 includes a pair of second electric push rods 19, a box cover 20, a positioning plate 24, six adjusting inner molds 25 and six driven inner molds 26. The pair of second electric push rods 19 are arranged on the installation frame 5. The box cover 20 is connected to the piston rods of the pair of second electric push rods 19. The positioning plate 24 is installed on the side of the box cover 20 away from the second electric push rods 19. The six adjusting inner molds 25 and the driven inner molds 26 are slidably installed on the side of the positioning plate 24 away from the box cover 20. The six adjusting inner molds 25 and the driven inner molds 26 are both arranged in a circular and evenly distributed manner. The adjusting inner molds 25 and the driven inner molds 26 are arranged at intervals. On the side of each adjusting inner mold 25 close to the positioning plate 24, there is a round pin. On the side of each driven inner mold 26 close to the positioning plate 24, there is a slider. Six straight-head chutes and round-head chutes are formed on the positioning plate 24. The round pins are slidably arranged in the round-head chutes, and the sliders are installed in the straight-head chutes. A return spring 27 is arranged between each slider and the straight-head chute. Each set of inner modules 10 further includes a second motor 21, a driving bevel gear 22 and a bevel gear indexing plate 23. The second motor 21 is installed inside the box cover 20 through a bracket. The driving bevel gear 22 is installed on the motor shaft of the second motor 21. The bevel gear indexing plate 23 is rotatably installed on the side of the positioning plate 24 close to the box cover 20. The bevel gear indexing plate 23 is meshed and connected with the driving bevel gear 22. An inclined chute is formed on the bevel gear indexing plate 23, and the round pin is slidably connected with the inclined chute.

[0033] When the temperature sensor inside the inner mold cylinder 15 detects that the overall temperature of the injection-molded lamp housing has dropped and the molten plastic has reached the solidification temperature, the solenoid valve is closed through the control system to block the continuous inflow of cooling water into the water jacket 12. The cooling water remaining in the water jacket 12 continues to absorb the residual heat of the lamp housing to prevent the temperature of the inner mold cylinder 15 from completely cooling. When subsequent injection molding is carried out, it plays the role of enhancing the fluidity of the molten plastic. Before injection molding, the second electric push rod 19 pushes the inner module 10 into the inner mold cylinder 15. The second motor 21 drives the driving bevel gear 22 to rotate, the driving bevel gear 22 drives the bevel gear indexing plate 23 to rotate, and the inclined chute on the bevel gear indexing plate 23 pushes the round pin to move. All the adjusting inner molds 25 move outward, and all the driven inner molds 26 also move outward under the action of the adjusting inner molds 25. The adjusting inner molds 25 and the driven inner molds 26 enclose the inner wall of the lamp housing. When demolding is required, the bevel gear indexing plate 23 rotates in reverse to move the adjusting inner molds 25 inward. Under the action of the return spring 27, all the driven inner molds 26 also move inward to make the adjusting inner molds 25 and the driven inner molds 26 separate from the inner wall of the lamp housing. Subsequently, the second electric push rod 19 retracts the inner module 10, and the first electric push rod 17 pushes the demolding push plate 18 outward of the inner mold cylinder 15 to push the lamp housing out of the inner mold cylinder 15. Under the action of gravity, the lamp housing separates from the demolding push plate 18 and falls off the device, and the lamp housing falls onto the conveyor belt below the device and moves to the next processing procedure.

[0034] Two injection molding machines are installed in the left chassis 1 through a moving module (not shown in the figure). Each injection molding machine includes an injection barrel 28, a feeding screw 30, a feeding pipe 33, and a third motor 29. The injection barrel 28 is connected to the moving module. An electric heating wire is installed in the inner wall of the injection barrel 28. The feeding screw 30 is rotatably installed inside the injection barrel 28. The motor shaft of the third motor 29 penetrates through the injection barrel 28 and is connected to the feeding screw 30. The feeding pipe 33 is connected to one side of the injection barrel 28 close to the third motor 29. The inside of the feeding screw 30 is hollow. A closing pin 32 is slidably installed inside the feeding screw 30. An inner spring 31 is connected between the closing pin 32 and the inside of the feeding screw 30. An electromagnet (not shown in the figure) is also installed inside the feeding screw 30. The electromagnet is electrically connected to the control system. The moving module docks the end of the injection barrel 28 with the injection hole on the demolding push plate 18. The molten plastic is squeezed into the injection cavity formed by the outer module 9 and the inner module 10 by the feeding screw 30. After the injection cavity is filled, the electromagnet is energized to attract the closing pin 32 towards the end of the injection barrel 28, so that the closing pin 32 cuts off the inside of the injection barrel 28 from the injection cavity, thereby avoiding caking in the injection channel and avoiding residual protruding plastic columns on the outer surface of the lamp housing.

[0035] The working principle of the present invention: The first motor 6 drives the rotating shaft 35 to rotate. The rotating shaft 35 drives the first gear 3 and the second gear 4 to rotate synchronously. The first gear 3 drives the installation gear ring 7 to rotate. The installation gear ring 7 drives the outer module 9 to rotate. The second gear 4 drives the hollow gear 8, and the hollow gear 8 drives the inner module 10 to rotate. Each outer module 9 corresponds to each inner module 10 one by one. After the outer module 9 and the inner module 10 are closed, an injection cavity is formed. After the injection molding machine injects plastic into an injection cavity, waiting for the water cooling component to cool the injection cavity. After the cooling is completed, the synchronous drive unit drives the injection cavity to rotate, rotates the outer module 9 and the inner module 10 to other positions for demolding, and promotes the next injection cavity to start injection quickly, improving the working efficiency of the injection molding device.

[0036] During injection molding, the piston rod of the first electric push rod 17 retracts, pulling the demolding push plate 18 to the tail position. The second electric push rod 19 pushes the inner module 10 into the inner mold cylinder 15. The moving module drives the injection molding machine to insert into the injection hole of the demolding push plate 18. After injection, the temperature sensor in the inner mold cylinder 15 detects the heat of the molten plastic, causing the solenoid valve in the outer module 9 to open, and the water in the water tank 11 is poured into the water jacket 12.

[0037] The water supply system fills the cooling water into the water tank 11 through the water inlet pipe. The pressure of the cooling water in the first inner tank rises. When the water pressure exceeds the overflow pressure of the pressure maintaining valve, the cooling water flows into the second inner tank through the pressure maintaining valve and finally flows out through the water outlet pipe. Through the setting of the pressure maintaining valve, a certain water pressure is maintained in the first inner tank for the cooling of the outer module 9. When the cooling water enters the water jacket 12 through the solenoid valve, the pressure energy of the water will push the turbulence rotating plate 14 to move, so that the rotating ring 13 and several turbulence rotating plates 14 rotate inside the water jacket 12, evenly diffusing the cooling water flow to the outside of the inner mold cylinder 15 to achieve the cooling of the injection molded part. The heat-absorbing cooling water flows into the second inner tank through the one-way valve of the water outlet hole. Through the setting of the rotating ring 13 and several turbulence rotating plates 14, the cooling water flows and diffuses more evenly on the outside of the injection molded part, enhancing the overall heat absorption and cooling effect and realizing the rapid cooling of the injection molded part.

[0038] When the temperature sensor inside the inner mold cylinder 15 detects that the overall temperature of the injection molded lamp housing has dropped and the molten plastic has reached the solidification temperature, the control system closes the solenoid valve to block the continuous inflow of cooling water into the water jacket 12. The cooling water remaining in the water jacket 12 continues to absorb the residual heat of the lamp housing to prevent the temperature of the inner mold cylinder 15 from completely cooling. When subsequent injection molding is carried out, it plays an effect of enhancing the fluidity of the molten plastic. Before injection molding, the second electric push rod 19 pushes the inner module 10 into the inner mold cylinder 15. The second motor 21 drives the driving bevel gear 22 to rotate, and the driving bevel gear 22 drives the bevel gear indexing plate 23 to rotate. The inclined chute on the bevel gear indexing plate 23 pushes the round pin to move, and all the adjusting inner molds 25 move outward. All the driven inner molds 26 also move outward under the action of the adjusting inner mold 25. The adjusting inner mold 25 and the driven inner mold 26 enclose the inner wall of the lamp housing. When demolding is required, the bevel gear indexing plate 23 rotates in reverse to move the adjusting inner mold 25 inward. Under the action of the return spring 27, all the driven inner molds 26 also move inward to close, so that the adjusting inner mold 25 and the driven inner mold 26 are separated from the inner wall of the lamp housing. Subsequently, the second electric push rod 19 retracts the inner module 10, and the first electric push rod 17 pushes the demolding push plate 18 to the outside of the inner mold cylinder 15 to push the lamp housing out of the inner mold cylinder 15. Under the action of gravity, the lamp housing is separated from the demolding push plate 18 and falls off the device, and the lamp housing falls onto the conveyor belt below the device and moves to the next processing step.

[0039] The moving module docks the end of the injection cylinder 28 with the injection hole on the demolding push plate 18, and uses the feeding screw 30 to squeeze the molten plastic into the injection cavity formed by the outer module 9 and the inner module 10. After the injection cavity is filled, the electromagnet is energized to attract the closing pin 32 towards the end of the injection cylinder 28, so that the closing pin 32 cuts off the inside of the injection cylinder 28 from the injection cavity, thus avoiding caking in the injection channel and avoiding the residual protruding plastic columns on the outer surface of the lamp housing.

[0040] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. An injection molding device for producing holiday light housings, characterized in that: The invention comprises a left chassis (1), a right chassis (2), a mounting gear ring (7), a hollow gear (8), a plurality of outer modules (9), a plurality of inner modules (10), a synchronous drive unit, at least one injection molding machine, and a water cooling component, wherein the mounting gear ring (7) is arranged in the left chassis (1), the hollow gear (8) is arranged in the right chassis (2), a plurality of the outer modules (9) are arranged on the mounting gear ring (7), a plurality of the inner modules (10) are arranged on the hollow gear (8), the synchronous drive unit is installed at the upper ends of the left chassis (1) and the right chassis (2), and at least one injection molding machine and the water cooling component are arranged in the left chassis (1); A mounting frame (5) is provided on a side of the hollow gear (8) away from the left chassis (1); each group of the inner mold assembly (10) comprises a pair of second electric push rods (19), a box cover (20), a positioning plate (24), a plurality of adjustment inner molds (25) and a plurality of driven inner molds (26); the pair of second electric push rods (19) are provided on the mounting frame (5); the box cover (20) is connected to the piston rods of the pair of second electric push rods (19); the positioning plate (24) is installed on a side of the box cover (20) away from the second electric push rods (19); and the plurality of adjustment inner molds (25) and driven inner molds (26) are slidably installed on a side of the positioning plate (24) away from the box cover (20); A plurality of the adjusting inner dies (25) and the driven inner dies (26) are evenly distributed in a ring shape, the adjusting inner dies (25) and the driven inner dies (26) are spaced apart from each other, a round pin is arranged on a side of each adjusting inner dies (25) close to the positioning plate (24), a slider is arranged on a side of each driven inner dies (26) close to the positioning plate (24), a plurality of straight head slide grooves and round head slide grooves are provided on the positioning plate (24), the round pin is slidably arranged in the round head slide groove, the slider is installed in the straight head slide groove, and a return spring (27) is arranged between each slider and the straight head slide groove; Each group of the inner mold assembly (10) further comprises a second motor (21), a driving bevel gear (22) and a bevel gear displacement plate (23); the second motor (21) is mounted on the inner side of the housing cover (20) via a bracket; the driving bevel gear (22) is mounted on the motor shaft of the second motor (21); the bevel gear displacement plate (23) is rotatably mounted on a side of the positioning plate (24) close to the housing cover (20); the bevel gear displacement plate (23) is meshingly connected with the driving bevel gear (22); an inclined groove is formed on the bevel gear displacement plate (23); and the round pin is slidably connected with the inclined groove; All of the adjustable inner molds (25) move outward, and all of the driven inner molds (26) also move outward under the action of the adjustable inner molds (25). After the injection molding machine injects plastic into an injection cavity, the water cooling component cools the injection cavity. After the cooling is completed, the synchronous driving unit drives the injection cavity to rotate, and the outer mold assembly (9) and the inner mold assembly (10) are rotated to other positions for demoulding.

2. The injection molding device for producing holiday light housing according to claim 1, characterized in that: The synchronous drive unit comprises a first gear (3), a second gear (4), a first motor (6) and a rotating shaft (35); the first motor (6) is arranged on the right chassis (2); the rotating shaft (35) is connected to the motor shaft of the first motor (6); the first gear (3) and the second gear (4) are mounted on the rotating shaft (35); the first gear (3) is meshedly connected to the mounting gear ring (7); and the second gear (4) is meshedly connected to the hollow gear (8).

3. The injection molding device for producing holiday light housing according to claim 1, characterized in that: Each of the outer mold groups (9) comprises a water jacket (12), an inner mold barrel (15), a core column (16), a pair of first electric push rods (17) and a connecting plate (34); the water jacket (12) is arranged on the inner ring of the mounting gear ring (7); the inner mold barrel (15) is installed inside the water jacket (12); the core column (16) is connected to the water jacket (12) via the connecting plate (34); the core column (16) is located in the middle of the inner mold barrel (15); and the pair of first electric push rods (17) are installed on the core column (16).

4. The injection molding device for producing holiday light housing according to claim 3, characterized in that: Each of the outer mold groups (9) further comprises a demoulding push plate (18), a rotating ring (13) and some spoiler vortex plates (14); the demoulding push plate (18) is connected to the piston rods of a pair of first electric push rods (17); an injection hole is provided on the demoulding push plate (18); the demoulding push plate (18) is slidably mounted between the inner mold cylinder (15) and the core column (16); the rotating ring (13) is rotatably mounted inside the water jacket (12); a plurality of spoiler vortex plates (14) are evenly distributed in an annular shape on the rotating ring (13); a water inlet hole is provided on a side of the water jacket (12) close to the core column (16); and a water outlet hole is provided on a side of the water jacket (12) away from the core column (16).

5. The injection molding device for producing holiday light housing according to claim 4, characterized in that: The water cooling assembly comprises a water supply system, a water inlet pipe, a water outlet pipe, a water tank (11) and a pressure-retaining valve. The water tank (11) is arranged in the middle of a plurality of outer mold groups (9). A first inner groove connected to the water inlet hole is provided inside the water tank (11). A second inner groove connected to the water outlet hole is also provided inside the water tank (11). The first inner groove is connected to the second inner groove. The pressure-retaining valve is arranged at the connection point between the first inner groove and the second inner groove. The water supply system is rotatably sealedly connected to the first inner groove of the water tank (11) through the water inlet pipe. The water supply system is rotatably sealedly connected to the second inner groove of the water tank (11) through the water outlet pipe. A temperature sensor is arranged inside the inner mold cylinder (15) of each outer mold group (9). A solenoid valve is arranged at the water inlet hole of each water jacket (12). A one-way valve is arranged at the water outlet hole of the water jacket (12). The solenoid valve and the temperature sensor are connected to the control system through a circuit.

6. The injection molding device for producing holiday light housing according to claim 1, characterized in that: At least one of the injection molding machines is installed in the left chassis (1) through a movable module. Each injection molding machine includes an injection molding barrel (28), a feeding screw (30), a feeding pipe (33) and a third motor (29). The injection molding barrel (28) is connected to the movable module. An electric heating wire is installed in the inner wall of the injection molding barrel (28). The feeding screw (30) is rotatably installed inside the injection molding barrel (28). The motor shaft of the third motor (29) passes through the injection molding barrel (28) and is connected to the feeding screw (30). The feeding pipe (33) is connected to a side of the injection molding barrel (28) close to the third motor (29).

7. The injection molding device for producing holiday light housing according to claim 6, characterized in that: The feeding screw (30) is hollow inside, a closing pin (32) is slidably mounted inside the feeding screw (30), an inner spring (31) is connected between the closing pin (32) and the inside of the feeding screw (30), and an electromagnet is also arranged inside the feeding screw (30), and the electromagnet is connected to a control system circuit.

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