A plastic injection molding device

Abstract

The present invention discloses a plastic injection molding device, belonging to the technical field of injection molding. A plastic injection molding device includes a workbench with an injection mold assembly, a melting injection tube fixedly connected to the workbench, and the injection end of the melting injection tube is communicated with the input end of the injection mold assembly. A spiral lifting mechanism is arranged in the feed cylinder. The present invention can effectively increase the temperature of plastic particles, thereby accelerating their melting or processing process. It can also make the ejected hot air help evaporate the moisture on the surface of plastic particles, reduce the moisture content, prevent vacuum bubbles from being generated in the molten plastic with moisture, prevent bubbles or pores from forming inside the molded plastic tray, improve the strength of the finished product, and can also transfer the excess heat in the coolant to the inside of the feed cylinder for heating the air, recycling the excess heat in the injection mold assembly, not only reducing the waste of heat resources, but also reducing the energy consumption of the cooling circulation pump.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly to a plastic injection molding device. Background Art

[0002] Plastic injection molding is a process widely used in plastic manufacturing. It uses hot molten plastic materials to form through a mold to produce various plastic products. The advantage of this technology is that it can efficiently and mass-produce parts with complex shapes and is widely used in fields such as electronic products, automobiles, and household items. With the rise of tea culture and the change of consumers' lifestyles, the tea set market has been continuously growing. The diversified demand for tea sets has promoted the production of related auxiliary products, including plastic trays for placing and displaying tea sets. Plastic trays not only have the characteristics of being light and easy to clean, but also can effectively protect ceramic or glass tea sets from being damaged.

[0003] Therefore, the use of plastics has increased sharply, and the environmental pollution problem has become more and more serious. The recycling and reuse of waste plastics have gradually become an important topic in the plastic injection molding industry. The recycling of waste plastics not only helps to reduce the demand for new plastic raw materials, but also can reduce the raw material procurement cost and achieve the sustainable utilization of resources. Therefore, more and more enterprises can recycle and crush the cleaned polypropylene and polyethylene into particles and then use the particles for a second time.

[0004] Due to the increasing demand, the production progress needs to be followed up in a timely manner. In the prior art, there are the following drawbacks in the injection molding process of plastic trays for placing and displaying tea sets. During the injection molding process, due to the residual excess moisture inside the conveyed plastic, the plastic with moisture will generate vacuum bubbles in the molten state, which will cause bubbles or pores inside the plastic tray, resulting in a reduction in the strength of the finished product. And during the cooling process, it is necessary to use a coolant to cool the heat of the plastic material injected into the mold to make the plastic tray cool and form. However, the coolant that absorbs heat will return to the cooling circulation pump for cooling, and the excess heat in the mold cannot be recycled, which not only wastes heat resources but also increases the energy consumption of the cooling circulation pump. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art that the plastic with moisture will generate vacuum bubbles in the molten state, which will cause bubbles or pores inside the plastic tray, resulting in a reduction in the strength of the finished product and the excess heat in the mold cannot be recycled, which not only wastes heat resources but also increases the energy consumption of the cooling circulation pump, and to propose a plastic injection molding device.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A plastic injection molding device, including a workbench with an injection mold assembly, further comprising: a melting injection pipe fixedly connected to the workbench, and the injection end of the melting injection pipe is communicated with the input end of the injection mold assembly. Among them, a feeding cylinder is fixedly connected to the feeding end of the melting injection pipe through a mounting pipe. A spiral lifting mechanism is arranged in the feeding cylinder, and air injection holes are arranged on the spiral lifting mechanism. When the spiral lifting mechanism drives the plastic to move from bottom to top, the air injection holes move synchronously and inject air; a hollow plate is sleeved on the outer wall of the melting injection pipe. A cooling pipe is arranged in the injection mold assembly, and the output end of the cooling pipe is communicated with the cavity of the hollow plate; a drying mechanism is arranged on the inner wall of the feeding cylinder, and the input end of the drying mechanism is communicated with the cavity of the hollow plate through a connecting pipe; a backflush air injection mechanism is arranged in the feeding cylinder. Among them, an air outlet hole is opened at the top of the feeding cylinder, and the air injection end of the backflush air injection mechanism faces the air outlet hole. When the air injection holes inject air, the backflush air injection mechanism sprays gas towards the air outlet hole.

[0008] Preferably, to facilitate the agitation of the plastic, the spiral lifting mechanism includes a hollow pipe rotatably connected in the feeding cylinder, and a spiral plate is fixedly connected to the outer wall of the hollow pipe.

[0009] Furthermore, to blow air on the plastic while the spiral plate agitates the plastic, a transmission disc is fixedly connected to the top of the feeding cylinder. A turbine blade is fixedly connected to the outer wall of the hollow pipe, and the turbine blade is arranged in the cavity of the transmission disc. And the transmission disc is arranged on the connecting pipe. When the coolant is transported through the connecting pipe, the turbine blade rotates synchronously.

[0010] Even further, to facilitate the heating of the air in the feeding cylinder, the drying mechanism includes: a heat conducting plate fixedly connected to the inner wall of the feeding cylinder. Among them, a cavity is opened in the heat conducting plate. An inlet liquid pipe and an outlet liquid pipe are respectively fixedly connected to the feeding cylinder, and both the inlet liquid pipe and the outlet liquid pipe are communicated with the cavity. The inlet liquid pipe is communicated with the connecting pipe; a cooling circulation pump is arranged on the workbench. Among them, the input end of the cooling circulation pump is fixedly connected to the outlet liquid pipe through a pipeline, the output end of the cooling circulation pump is communicated with the cooling pipe, and the cooling pipe includes a conveying pipe and an output pipe arranged in the injection mold assembly. The conveying pipe is communicated with the output end of the cooling circulation pump, and the output pipe is fixedly connected to the hollow plate.

[0011] Preferably, to facilitate the discharge of the moisture in the feeding cylinder, the backflush air injection mechanism includes a hollow disc fixedly connected to the outer wall of the hollow pipe. The hollow disc is arranged in the feeding cylinder, and a cavity is opened in the hollow disc. The cavity is communicated with the hollow pipe. A through hole is opened at the top of the hollow disc, and the jet end of the through hole faces the air outlet hole.

[0012] To facilitate the recovery and utilization of the heat outside the hollow plate, further, a gas transmission plate is fixedly connected to the top of the transmission disk, a main gear is arranged in the gas transmission plate where the hollow tube extends, a rotating shaft is rotatably connected in the gas transmission plate, an auxiliary gear is fixedly connected to the rotating shaft, the main gear meshes with the auxiliary gear, a pressurization plate is fixedly connected to the top of the gas transmission plate, a blade is fixedly connected to the rotating shaft extending into the pressurization plate, a heat conduction tube is wound around the outer wall of the hollow plate, the heat conduction tube is communicated with the pressurization plate, and the pressurization plate is communicated with the cavity of the gas transmission plate through an air outlet pipe.

[0013] To facilitate the supply of hot air to the diversion cavity and the air injection holes, preferably, a diversion cavity is formed in the hollow tube, the diversion cavity is communicated with the gas transmission plate, a diversion cavity is formed in the spiral plate, and the diversion cavity is respectively communicated with the diversion cavity and the air injection holes.

[0014] To facilitate the filtration and cleaning of the air entering the heat conduction tube, preferably, a filter box is arranged at the air inlet end of the heat conduction tube, and a filter screen is arranged in the filter box.

[0015] To facilitate the injection molding of the plastic tray, further, the injection molding die assembly includes a concave die and a convex die, a working box is fixedly connected to the workbench, the concave die is fixedly connected in the working box and is communicated with the injection end of the melting injection tube, and the convex die is slidably connected in the working box and cooperates with the concave die.

[0016] A plastic injection molding method has the following operating steps:

[0017] Step 1: Convey the plastic through a pipeline into the feeding cylinder, start the melting injection tube, and inject the melted plastic liquid into the injection molding die assembly;

[0018] Step 2: When the injection molding die assembly demolds, start the cooling circulation pump, so that the coolant cools and demolds the die through the conveying pipe and the output pipe, and the coolant adsorbs the heat of the die and is injected into the cavity of the hollow plate;

[0019] Step 3: The coolant in the cavity of the hollow plate adsorbs the heat on the outer wall of the melting injection tube and transfers it into the heat conduction plate, and the temperature of the heat conduction plate rises to heat and dehumidify the plastic particles in the feeding cylinder;

[0020] Step 4: The spiral plate rotates to drive the particles in the feeding cylinder to move, and the air injection holes jet hot air to the moving particles;

[0021] Step 5: Jet air through the through holes, so that the humid gas in the feeding cylinder is discharged through the air outlet holes.

[0022] Compared with the prior art, the present invention provides a plastic injection molding device, which has the following beneficial effects:

[0023] 1. The plastic injection molding equipment drives the spiral plate to rotate through a hollow tube, so that the spiral plate drives the plastic particles to move spirally inside the feeding cylinder. While stirring the plastic particles, it can also uniformly mix the plastic particles in the cylinder. While stirring, the air injection holes synchronously move spirally along with the spiral lifting mechanism, and hot air is ejected from the air injection holes. As the air injection holes move, on the one hand, the hot air can be evenly distributed throughout the cylinder, effectively increasing the temperature of the plastic particles, thereby accelerating their melting or processing process. On the other hand, it can also make the ejected hot air help evaporate the moisture on the surface of the plastic particles, reduce the moisture content, thereby reducing bubbles and defects caused by moisture, improving the quality of the final product, preventing vacuum bubbles from being generated in the molten plastic with moisture, preventing bubbles or pores from forming inside the molded plastic tray, and improving the strength of the finished product;

[0024] 2. For this plastic injection molding equipment, by starting the cooling circulation pump, the coolant will first pass through the inside of the injection mold assembly to cool and form the mold. The coolant that absorbs heat will first pass through the cavity of the hollow plate sleeved on the outer wall of the melting injection pipe. During this process, the coolant will adsorb the excess heat dissipated from the outer wall of the melting injection pipe and transfer it to the heat conduction plate for recycling, enabling it to transfer the excess heat in the coolant to the inside of the feeding cylinder, and the excess heat in the injection mold assembly can be recycled. This not only reduces the waste of heat resources but also reduces the energy consumption of the cooling circulation pump;

[0025] 3. When the plastic injection molding equipment drives the plastic particles to move through the spiral plate, the air injection holes will eject the particles to the outside of the drying mechanism on the inner wall of the feeding cylinder, thereby impacting and vibrating the whole plastic particles, promoting the evaporation of the water vapor of the plastic particles, improving the heat transfer efficiency of the hot air and moisture inside the feeding cylinder, promoting the rapid evaporation of the water vapor, accelerating the drying process of the plastic particles, and at the same time being able to preheat the plastic particles;

[0026] 4. The plastic injection molding equipment ejects gas through the through hole towards the air outlet hole. During this process, the moisture inside the feeding cylinder will be blown to the outside through the air outlet hole opened at the top of the feeding cylinder, quickly blowing out the moisture inside the feeding cylinder, significantly reducing the moisture content in the air inside the feeding cylinder, thereby improving the drying effect of the plastic particles and preventing the moisture from accumulating inside the feeding cylinder, thus keeping the environment dry;

[0027] 5. For this plastic injection molding equipment, a filter box is provided at the air inlet end of the heat conduction pipe, and a filter screen is arranged inside the filter box to intercept and filter the gas entering the heat conduction pipe, and the filter screen is detachably arranged for subsequent cleaning.

[0028] The parts not involved in this device are the same as the prior art or can be implemented using the prior art. The present invention can effectively increase the temperature of plastic particles, thereby accelerating their melting or processing process. It can also make the hot air ejected help evaporate the moisture on the surface of plastic particles, reduce the moisture content, thereby reducing bubbles and defects caused by moisture, improving the quality of the final product, preventing vacuum bubbles from being generated in the molten plastic with moisture, preventing bubbles or pores from forming inside the molded plastic tray, improving the strength of the finished product, and can also transfer the excess heat in the coolant to the inside of the feed cylinder for heating the air, recycling the excess heat in the injection mold assembly, not only reducing the waste of heat resources, but also reducing the energy consumption of the cooling circulation pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. 6 is an axonometric structural schematic diagram of a plastic injection molding device proposed by the present utility model;

[0030] Figure 2 FIG. 10 is a partial structural schematic diagram of a plastic injection molding device proposed by the present utility model Figure 1 ;

[0031] Figure 3 FIG. 16 is a partial structural schematic diagram of a plastic injection molding device proposed by the present utility model Figure 2 ;

[0032] Figure 4 FIG. 22 is a sectional structural schematic diagram of a plastic injection molding device proposed by the present utility model Figure 1 ;

[0033] Figure 5 FIG. 28 is a sectional structural schematic diagram of a plastic injection molding device proposed by the present utility model Figure 2 ;

[0034] Figure 6 FIG. 34 is a sectional structural schematic diagram of a plastic injection molding device proposed by the present utility model Figure 3 ;

[0035] Figure 7 FIG. 40 is a structural schematic diagram of the inside of the hollow tube of a plastic injection molding device proposed by the present utility model.

[0036] In the figure: 1, workbench; 2, melting injection tube; 3, installation tube; 4, feed cylinder; 5, hollow plate; 6, heat conduction tube; 7, filter box; 8, concave mold; 9, convex mold; 10, conveying tube; 11, output tube; 12, hollow tube; 13, spiral plate; 14, air injection hole; 15, diversion cavity; 16, shunt cavity; 17, hollow disk; 18, through hole; 19, turbine blade; 20, transmission disk; 21, air delivery disk; 22, main gear; 23, rotating shaft; 24, auxiliary gear; 25, pressure increasing disk; 26, blade; 27, air outlet pipe; 28, air outlet hole; 29, liquid inlet pipe; 30, heat conduction plate; 31, liquid outlet pipe. Specific implementation mode

[0037] 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.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0039] Embodiment:

[0040] Referring to Figures 1 - 7 , a plastic injection molding device includes a workbench 1 with an injection mold assembly, and further includes: a melting injection tube 2 fixedly connected to the workbench 1, and the injection end of the melting injection tube 2 is communicated with the input end of the injection mold assembly. Among them, a feed cylinder 4 is fixedly connected to the feed end of the melting injection tube 2 through an installation tube 3. A spiral lifting mechanism is arranged in the feed cylinder 4, and an air injection hole 14 is arranged on the spiral lifting mechanism. When the spiral lifting mechanism drives the plastic to move from bottom to top, the air injection hole 14 moves synchronously and jets air; a hollow plate 5 is sleeved on the outer wall of the melting injection tube 2. A cooling tube is arranged in the injection mold assembly, and the output end of the cooling tube is communicated with the cavity of the hollow plate 5; a drying mechanism is arranged on the inner wall of the feed cylinder 4, and the input end of the drying mechanism is communicated with the cavity of the hollow plate 5 through a connecting tube; a backflush air jetting mechanism is arranged in the feed cylinder 4. Among them, an air outlet hole 28 is opened at the top of the feed cylinder 4, and the air jetting end of the backflush air jetting mechanism faces the air outlet hole 28. When the air injection hole 14 jets air, the backflush air jetting mechanism jets gas towards the air outlet hole 28.

[0041] The melting injection tube 2 mainly consists of a melting system and an injection system. The melting system mainly consists of a heater, a screw, etc. It is the main part for heating and melting plastic pellets. The injection system mainly consists of an injection cylinder, an injection head, etc. It can inject the melted plastic into the injection mold assembly to complete the molding. At the feeding end of the melting injection tube 2, a feeding cylinder 4 is fixedly connected through a mounting tube 3 for injecting plastic particles into the melting injection tube 2.

[0042] When plastic particles are pre-injected into the interior of the feeding cylinder 4, the spiral lifting mechanism will drive the plastic particles to move spirally inside the feeding cylinder 4, stirring the plastic particles while also being able to uniformly mix the plastic particles in the cylinder. During the agitation, the air injection holes 14 synchronously move spirally following the spiral lifting mechanism, and the air injection holes 14 eject hot air. As the air injection holes 14 move, on the one hand, the hot air can be evenly distributed throughout the cylinder, effectively increasing the temperature of the plastic particles, thereby accelerating their melting or processing process. On the other hand, it can also make the ejected hot air help evaporate the moisture on the surface of the plastic particles, reducing the moisture content, thereby reducing bubbles and defects caused by moisture, improving the quality of the final product, preventing vacuum bubbles from being generated in the molten plastic with moisture, preventing bubbles or pores from forming inside the molded plastic tray, and improving the strength of the finished product.

[0043] In addition, during the process of the spiral lifting mechanism driving the plastic particles to stir spirally inside the feeding cylinder 4, the plastic particles will be fully in contact with the drying mechanism. The plastic particles can be in full contact with the outside of the drying mechanism during the moving process. When the cooling circulation pump is started, the coolant will first pass through the interior of the injection mold assembly to cool the mold for molding, and the coolant that absorbs heat will first pass through the cavity of the hollow plate 5 sleeved on the outer wall of the melting injection tube 2. During this process, the coolant will adsorb the excess heat dissipated from the outer wall of the melting injection tube 2 and transfer it to the drying mechanism for recycling, enabling it to transfer the excess heat in the coolant to the interior of the feeding cylinder 4, and the excess heat in the injection mold assembly can be recycled, not only reducing the waste of heat resources but also reducing the energy consumption of the cooling circulation pump.

[0044] Moreover, the spiral lifting mechanism can cooperate with the drying mechanism. When the spiral lifting mechanism drives the plastic particles to move, the air injection holes 14 will eject the particles onto the outside of the drying mechanism on the inner wall of the feeding cylinder 4, thereby impacting and vibrating the whole plastic particles, thus promoting the evaporation of the water vapor of the plastic particles, increasing the heat transfer efficiency of the hot air and moisture inside the feeding cylinder 4, promoting the rapid evaporation of the water vapor, accelerating the drying process of the plastic particles, and at the same time being able to pre-heat the plastic particles.

[0045] When the air jet hole 14 is in the process of jetting air, the recoil jetting mechanism jets gas towards the air outlet hole 28. During this process, the moisture inside the feed cylinder 4 is blown to the outside through the air outlet hole 28 opened at the top of the feed cylinder 4, which can quickly blow out the moisture inside the feed cylinder 4, significantly reduce the moisture content in the air inside the feed cylinder 4, thereby improving the drying effect of the plastic particles, and can also prevent the moisture from accumulating inside the feed cylinder 4, thus keeping the environment dry.

[0046] Furthermore, the above-mentioned spiral lifting mechanism includes a hollow tube 12 rotatably connected inside the feed cylinder 4, and a spiral plate 13 is fixedly connected to the outer wall of the hollow tube 12.

[0047] By rotating the hollow tube 12, the spiral plate 13 can be driven to rotate, so that it drives the plastic particles to move inside the feed cylinder 4.

[0048] A transmission disk 20 is fixedly connected to the top of the feed cylinder 4, a turbine blade 19 is fixedly connected to the outer wall of the hollow tube 12, and the turbine blade 19 is arranged in the cavity of the transmission disk 20, and the transmission disk 20 is arranged on the connecting pipe. When the coolant is transported through the connecting pipe, the turbine blade 19 rotates synchronously.

[0049] When the cooling circulation pump works, the coolant entering the cavity of the hollow plate 5 is transported to the transmission disk 20 through the pipeline. At this time, the coolant will drive the turbine blade 19 to rotate during the flowing process, and then the hollow tube 12 drives the spiral plate 13 to rotate.

[0050] Even further, the above-mentioned drying mechanism includes: a heat conduction plate 30 fixedly connected to the inner wall of the feed cylinder 4. Among them, a cavity is opened in the heat conduction plate 30. An inlet liquid pipe 29 and an outlet liquid pipe 31 are respectively fixedly connected to the feed cylinder 4. Both the inlet liquid pipe 29 and the outlet liquid pipe 31 are communicated with the cavity, and the inlet liquid pipe 29 is communicated with the connecting pipe; a cooling circulation pump arranged on the workbench 1. Among them, the input end of the cooling circulation pump is fixedly connected to the outlet liquid pipe 31 through a pipeline, the output end of the cooling circulation pump is communicated with the cooling pipe, and the cooling pipe includes a conveying pipe 10 and an output pipe 11 arranged inside the injection mold assembly. The conveying pipe 10 is communicated with the output end of the cooling circulation pump, and the output pipe 11 is fixedly connected to the hollow plate 5.

[0051] And, the injection mold assembly includes a concave mold 8 and a convex mold 9. A work box is fixedly connected to the workbench 1. The concave mold 8 is fixedly connected inside the work box, and the concave mold 8 is communicated with the injection end of the melting injection pipe 2. The convex mold 9 is slidably connected inside the work box and cooperates with the concave mold 8. The melted plastic is injection molded by the cooperation of the concave mold 8 and the convex mold 9. And, the convex mold 9 is driven by a hydraulic cylinder.

[0052] When the cooling circulation pump is started, the liquid will be transported through the delivery pipe 10 into the concave mold 8 and the convex mold 9. The cooling liquid will adsorb the heat inside the mold and transfer it through the output pipe 11 into the hollow plate 5, and then be transported by the hollow plate 5 into the liquid inlet pipe 29. The liquid inlet pipe 29 will transfer the cooling liquid into the cavities of the heat conducting plates 30 at different positions on the inner wall of the feeding cylinder 4, causing the heat conducting plates 30 to generate heat, heating the air inside the feeding cylinder 4. Then, the cooling liquid will be discharged through the liquid outlet pipe 31 and transported to the input end of the cooling circulation pump to achieve the circulating function.

[0053] It should be explained that the above-mentioned backflush jet mechanism includes a hollow disk 17 fixedly connected to the outer wall of the hollow pipe 12. The hollow disk 17 is arranged inside the feeding cylinder 4, and a cavity is provided inside the hollow disk 17, which is communicated with the hollow pipe 12. A through hole 18 is provided at the top of the hollow disk 17, and the jet end of the through hole 18 faces the air outlet hole 28.

[0054] When gas is transported inside the hollow pipe 12, the through hole 18 will blow the gas towards the position of the air outlet hole 28, discharging the moisture inside the feeding cylinder 4 to the outside.

[0055] Here, in order to facilitate the transportation of hot gas inside the hollow pipe 12, a gas delivery disk 21 is fixedly connected to the top of the transmission disk 20. The hollow pipe 12 extends into the gas delivery disk 21 and is provided with a main gear 22. A rotating shaft 23 is rotatably connected inside the gas delivery disk 21, and an auxiliary gear 24 is fixedly connected to the rotating shaft 23. The main gear 22 meshes with the auxiliary gear 24. A pressurizing disk 25 is fixedly connected to the top of the gas delivery disk 21. The rotating shaft 23 extends into the pressurizing disk 25 and is fixedly connected with a blade 26. A heat conducting pipe 6 is wound around the outer wall of the hollow plate 5, and the heat conducting pipe 6 is communicated with the pressurizing disk 25. The pressurizing disk 25 is communicated with the cavity of the gas delivery disk 21 through an air outlet pipe 27.

[0056] When the hollow pipe 12 rotates, it will drive the main gear 22 inside the gas delivery disk 21 to rotate, and the main gear 22 will drive the auxiliary gear 24 on the rotating shaft 23 to rotate, causing the rotating shaft 23 to drive the blade 26 inside the pressurizing disk 25 to rotate. As a result, a negative pressure effect is generated inside the pressurizing disk 25. The heat conducting pipe 6 connected to the pressurizing disk 25 will adsorb the external air into the interior of the pressurizing disk 25, and then the gas will be transported to the cavity of the gas delivery disk 21 through the air outlet pipe 27. And the heat conducting pipe 6 can be a copper pipe. When the gas moves inside the heat conducting pipe 6, it will transfer the heat on the outer wall of the hollow plate 5, thereby heating and raising the temperature of the air, causing the gas inside the heat conducting pipe 6 to rise. A filter box 7 is provided at the air inlet end of the heat conducting pipe 6, and a filter screen is provided inside the filter box 7 for intercepting and filtering the gas entering the heat conducting pipe 6. And the filter screen is detachably arranged for subsequent cleaning.

[0057] In addition, a diversion cavity 15 is formed in the hollow tube 12. The diversion cavity 15 communicates with the air delivery disc 21. A flow division cavity 16 is formed in the spiral plate 13, and the flow division cavity 16 communicates with the diversion cavity 15 and the air injection holes 14 respectively. The gas is delivered into the flow division cavity 16 and the air injection holes 14 through the diversion cavity 15 respectively.

[0058] A plastic injection molding method comprises the following operating steps:

[0059] Step 1: Convey the plastic into the feeding cylinder 4 through a pipeline, start the melting injection pipe 2, and inject the melted plastic liquid into the injection mold assembly.

[0060] Step 2: When the injection mold assembly is demolded, start the cooling circulation pump, so that the coolant cools and demolds the mold through the delivery pipe 10 and the output pipe 11. After adsorbing the heat of the mold, the coolant is injected into the cavity of the hollow plate 5.

[0061] Step 3: The coolant in the cavity of the hollow plate 5 adsorbs the heat on the outer wall of the melting injection pipe 2 and transfers it into the heat conducting plate 30. The temperature of the heat conducting plate 30 rises to heat and dehumidify the plastic particles in the feeding cylinder 4.

[0062] Step 4: The spiral plate 13 rotates to drive the movement of the particles in the feeding cylinder 4, and the air injection holes 14 inject hot air to the moving particles.

[0063] Step 5: The through hole 18 jets air, so that the humid gas in the feeding cylinder 4 is discharged through the air outlet hole 28.

[0064] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitution or change, and all should be covered by the protection scope of the present invention.

Claims

1. A plastic injection molding device, comprising a workbench (1) with an injection mold assembly, characterized in that: Also includes: A melting injection tube (2) is fixedly connected to the workbench (1), and an injection end of the melting injection tube (2) is connected to an input end of the injection mold assembly. The feed end of the melting injection tube (2) is fixedly connected to a feed barrel (4) via a mounting tube (3), a spiral lifting mechanism is arranged inside the feed barrel (4), and an air jet hole (14) is arranged on the spiral lifting mechanism. When the spiral lifting mechanism drives the plastic to move from bottom to top, the air jet hole (14) moves synchronously and sprays air; A hollow plate (5) is sleeved on the outer wall of the melting injection tube (2); a cooling tube is arranged in the injection mold assembly, and the output end of the cooling tube is connected to the cavity of the hollow plate (5); A drying mechanism is arranged on the inner wall of the feed cylinder (4), and the input end of the drying mechanism is connected to the cavity of the hollow plate (5) through a connecting pipe; A recoil jet mechanism is arranged in the feed barrel (4), The top of the feed barrel (4) is provided with an air outlet (28), the jet end of the recoil jet mechanism is directed toward the air outlet (28), and when the jet hole (14) jets, the recoil jet mechanism jets gas toward the air outlet (28); The spiral lifting mechanism comprises a hollow tube (12) rotatably connected to the inside of the feeding cylinder (4), and a spiral plate (13) is fixedly connected to the outer wall of the hollow tube (12); A transmission disc (20) is fixedly connected to the top of the feed barrel (4), a turbine blade (19) is fixedly connected to the outer wall of the hollow tube (12), and the turbine blade (19) is arranged in the cavity of the transmission disc (20), and the transmission disc (20) is arranged on the connecting pipe, and when the coolant is transported through the connecting pipe, the turbine blade (19) rotates synchronously; The top of the transmission disc (20) is fixedly connected to an air delivery disc (21); the hollow tube (12) extends to the air delivery disc (21) and is provided with a main gear (22); a rotating shaft (23) is rotatably connected to the air delivery disc (21); an auxiliary gear (24) is fixedly connected to the rotating shaft (23); the main gear (22) and the auxiliary gear (24) are meshed; a booster disc (25) is fixedly connected to the top of the air delivery disc (21); the rotating shaft (23) extends to the booster disc (25) and is fixedly connected with blades (26); a heat conduction pipe (6) is wound around the outer wall of the hollow plate (5); the heat conduction pipe (6) is connected to the booster disc (25); and the booster disc (25) is connected to the cavity of the air delivery disc (21) through an air outlet pipe (27).

2. A plastic injection molding device according to claim 1, characterized in that: The drying mechanism comprises: a heat conducting plate (30) fixedly connected to the inner wall of the feed barrel (4), A cavity is provided in the heat conducting plate (30), and a liquid inlet pipe (29) and a liquid outlet pipe (31) are fixedly connected to the feed cylinder (4), respectively; the liquid inlet pipe (29) and the liquid outlet pipe (31) are both connected to the cavity, and the liquid inlet pipe (29) is connected to the connecting pipe; a cooling circulation pump arranged on the workbench (1), The input end of the cooling circulation pump is fixedly connected to the liquid outlet pipe (31) through a pipeline, and the output end of the cooling circulation pump is connected to the cooling pipe. The cooling pipe includes a delivery pipe (10) and an output pipe (11) arranged in the injection mold assembly. The delivery pipe (10) is connected to the output end of the cooling circulation pump, and the output pipe (11) is fixedly connected to the hollow plate (5).

3. A plastic injection molding device according to claim 1, characterized in that: The recoil jet mechanism comprises a hollow disk (17) fixedly connected to the outer wall of the hollow tube (12); the hollow disk (17) is arranged in the feed barrel (4); a cavity is formed in the hollow disk (17); the cavity is communicated with the hollow tube (12); a through hole (18) is formed at the top of the hollow disk (17); and the jet end of the through hole (18) faces the air outlet (28).

4. A plastic injection molding device according to claim 1, characterized in that: A flow guide cavity (15) is provided in the hollow tube (12), and the flow guide cavity (15) is connected to the gas delivery plate (21). A flow diversion cavity (16) is provided in the spiral plate (13), and the flow diversion cavity (16) is respectively connected to the flow guide cavity (15) and the gas injection hole (14).

5. The plastic injection molding equipment according to claim 1, characterized in that: The air inlet end of the heat conducting pipe (6) is provided with a filter box (7), and a filter screen is provided inside the filter box (7).

6. A plastic injection molding device according to claim 1, characterized in that: The injection mold assembly comprises a female mold (8) and a male mold (9); a work box is fixedly connected to the workbench (1); the female mold (8) is fixedly connected in the work box, and the female mold (8) is connected to the injection end of the melting injection tube (2); the male mold (9) is slidably connected in the work box and cooperates with the female mold (8).

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