Injection molding device for bubble removing type plastic pipe connecting piece

Abstract

The invention relates to the related technical field of injection molding, discloses an injection molding device for a bubble removal type plastic pipe connecting piece, and aims to solve the problem that the product quality is reduced due to the fact that molten plastic of an existing device is easy to carry bubbles. The device comprises an injection molding machine base, a lower die plate with double stations is rotationally connected to the injection molding machine base, an upper die plate corresponds to the upper portion of the injection molding machine base, a first lifting seat and a second lifting seat which can ascend and descend are arranged above the upper die plate and are connected with a feeding pipe, a hopper and an upper screw rod with a drive respectively, the lower end of the feeding pipe is connected with a centrifugal melting barrel, a conical barrel is arranged in the feeding pipe, and a quartz electric heating pipe is arranged between the feeding pipe and the centrifugal melting barrel. An arc-shaped filter screen, a conical stock bin and a blanking pipe with a nozzle are arranged at the bottom; the centrifugal melting barrel rotates at a high speed to generate centrifugal force to separate bubbles, heating and filtering structures are combined to improve the purity of raw materials, continuous operation is achieved through the double-station design, and the product quality and the production efficiency are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, specifically to an injection molding device for a bubble-removing type plastic tube connector. Background Technology

[0002] In the injection molding process of plastic products, especially plastic pipe fittings, air bubbles are often trapped in the molten plastic. The presence of these air bubbles can cause defects on the product surface, such as pores and silver streaks, which seriously affect the appearance quality of the product. More importantly, air bubbles can significantly reduce the mechanical properties of the product, such as tensile strength and impact toughness, making the product prone to cracking or damage during use, thereby shortening the product's service life.

[0003] Traditional injection molding equipment typically attempts to reduce air bubbles by increasing injection pressure, extending holding time, or adding venting channels. However, these methods have limited effectiveness and may increase production costs or prolong molding cycles. For example, increasing injection pressure can lead to accelerated mold wear; adding venting channels can complicate the mold structure. Furthermore, for applications with high product quality requirements, existing technologies struggle to completely eliminate air bubbles in molten plastic, resulting in low product yield and high scrap rates. Therefore, effectively removing air bubbles from molten plastic and improving the quality and production efficiency of injection-molded products is a pressing technical problem that needs to be solved in the current injection molding technology field. Summary of the Invention

[0004] The purpose of this invention is to provide a formation monitoring and early warning device based on a vibration detector, so as to solve the problem mentioned in the background art that molten plastic is prone to carrying air bubbles, which leads to a decline in product quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an injection molding device for a bubble-removing plastic tube connector, comprising an injection molding machine base, a lower mold plate rotatably connected to the injection molding machine base, the rotation of the lower mold plate being switched via the rotatable connection for continuous operation, an upper mold plate correspondingly provided above the lower mold plate for cooperating with the lower mold plate to achieve mold closing, a first lifting seat provided above the upper mold plate for driving the feed pipe and other components to lift as a whole to adjust the relative position of the nozzle and the mold, a feed pipe fixedly connected to the first lifting seat for conveying plastic raw materials, a hopper fixedly connected to one side of the first lifting seat for storing plastic granules, the hopper being connected to the feed pipe to ensure that the raw materials smoothly enter the feed pipe, a second lifting seat correspondingly provided above the first lifting seat for driving the upper screw to move axially, a second hydraulic motor fixedly connected to the second lifting seat for providing rotational power to the upper screw, the output end of the second hydraulic motor being fixedly connected to the upper screw, pushing the raw materials downward by rotation, the upper screw being axially inserted through the feed pipe; The lower end of the feeding pipe is rotationally connected with a centrifugal melting cylinder, and the centrifugal force is generated by high-speed rotation to realize bubble separation. A conical cylinder is coaxially arranged in the centrifugal melting cylinder to ensure that the centrifugal force is uniformly applied to the raw materials, thereby improving the melting and bubble removal effects. A quartz electric heating tube is arranged in the annular gap between the centrifugal melting cylinder and the conical cylinder to realize efficient and uniform heating of the raw materials, thereby promoting the melting of the raw materials. An arc-shaped filter screen is fixedly connected to the bottom edge of the centrifugal melting cylinder. The arc-shaped design is adapted to the direction of the centrifugal force, which can effectively filter impurities in the molten plastic and improve the purity of the raw materials. A conical material bin is rotationally connected to the bottom of the centrifugal melting cylinder, which is convenient for temporarily storing molten plastic and guiding it to converge to the center. The bottom of the conical material bin is integrally connected with a feeding pipe for conveying the molten plastic to a nozzle. The lower end of the feeding pipe is equipped with a nozzle to realize precise injection of the molten plastic. The bottom end of the upper screw rod is fixedly connected with a stirring rod, which can stir the molten raw materials to make them mix more uniformly. The stirring rod penetrates the conical cylinder along the axial direction. The lower end of the stirring rod is fixedly connected with a slide rod, which realizes the injection action by axial movement. The slide rod penetrates the conical material bin along the axial direction. The lower end of the slide rod is fixedly connected with a lower screw rod, which pushes the molten plastic into the feeding pipe by rotation. The lower screw rod penetrates the feeding pipe along the axial direction.

[0006] Further, the lower mold plate is disc-shaped, one side of which is provided with a first injection molding position, and the opposite side is provided with a second injection molding position. The first injection molding position and the second injection molding position are centrally symmetrically distributed around the center of the lower mold plate, which can realize alternating injection molding operation and greatly improve production efficiency.

[0007] Further, the first tooth ring is fixedly connected to the outer side wall of the lower mold plate, and the first hydraulic motor is fixedly connected inside the injection molding machine base to provide rotary driving force. The output end of the first hydraulic motor is fixedly connected with a first drive gear, which is engaged with the first tooth ring to realize precise rotary positioning of the lower mold plate through gear transmission, thereby ensuring the accuracy of injection molding position switching.

[0008] Further, a lifting plate is provided below the lower mold plate for mounting the first hydraulic cylinder and the first guide rod. The first hydraulic cylinder is fixedly connected to the lifting plate to provide lifting power. The output end of the first hydraulic cylinder is fixedly connected to the bottom of the lower mold plate to drive the lower mold plate to lift and realize mold closing and opening. The first guide rod is vertically fixedly connected to the lifting plate to ensure the stability and perpendicularity of the lifting movement of the upper mold plate, thereby improving the mold closing precision. The upper end of the first guide rod is fixedly connected to the upper mold plate.

[0009] Further, the first guide rod is provided with three, which are distributed in an equilateral triangle shape. One of the three first guide rods penetrates the center of the lower mold plate and forms a sliding fit with the lower mold plate. The other two first guide rods are symmetrically distributed on the outer side of the lower mold plate. This distribution forms a stable triangular support structure, which further enhances the overall stability of the lower mold plate rotation and the upper mold plate lifting.

[0010] Further, the second guide rod is vertically and fixedly connected to the upper die plate, and provides guidance for the lifting of the first lifting seat, and ensures the movement accuracy, the upper end of the second guide rod is fixedly connected with the first lifting seat, the second hydraulic cylinder is fixedly connected to the upper die plate, and provides lifting driving force, the output end of the second hydraulic cylinder is fixedly connected with the bottom of the first lifting seat, and the first lifting seat is driven to accurately lift, and the accurate butt joint of the nozzle and the mold gate is ensured.

[0011] Further, the third hydraulic cylinder is fixedly connected to the first lifting seat, and provides axial driving force, the output end of the third hydraulic cylinder is fixedly connected with the bottom of the second lifting seat, axial feeding control of the upper screw rod and related components is realized, and the accurate regulation and control requirements of material pushing and injection volume are met.

[0012] Further, the second gear ring is fixedly connected to the outer side wall of the upper part of the centrifugal melting cylinder, the third hydraulic motor is fixedly connected to one side of the first lifting seat and provides rotating power, the output end of the third hydraulic motor is fixedly connected with the second driving gear, the second driving gear is engaged with the second gear ring, and stable rotating power is provided for the centrifugal melting cylinder through gear transmission, so that the centrifugal force required by the centrifugal melting cylinder is ensured to realize bubble separation.

[0013] Further, the annular gap between the centrifugal melting cylinder and the tapered cylinder is filled with high-thermal-conductivity filler, the high-thermal-conductivity filler completely wraps the quartz electric heating tube, the heat conduction efficiency can be enhanced, the heat of the quartz electric heating tube can be more uniformly and quickly transmitted to the raw materials, and the melting efficiency is improved.

[0014] Further, the tapered cylinder has a tapered structure with a small upper end diameter and a large lower end diameter, and cooperates with the centrifugal force to make the raw materials gather to the bottom edge, so that the bubble separation effect is enhanced, and the spiral heat-conducting fins are fixedly connected to the inner wall of the tapered cylinder, so that the heat conduction area is increased, the heating efficiency is improved, and the raw materials are pushed downward during centrifugal rotation, so that the raw materials are uniformly melted and conveyed.

[0015] Compared with the prior art, the beneficial effects of the present application are: The injection molding device for the bubble-removing plastic pipe connector has the advantages that the centrifugal melting cylinder is arranged, and rotates at high speed, the centrifugal force is used to extrude and discharge the bubbles in the molten plastic to the central area, the effective bubble removal of the molten plastic is realized, the quality of the injection molding product is significantly improved, and the surface defects and the decrease of mechanical properties caused by the bubbles are avoided. The tapered cylinder is coaxially arranged in the centrifugal melting cylinder, and cooperates with the quartz electric heating tube and the arc-shaped filter screen, so that the raw materials can be uniformly heated and sufficiently melted under the action of the centrifugal force, and impurities can be effectively filtered, the purity and uniformity of the molten plastic are further improved, and the high-quality injection molding is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front appearance structure schematic view of the present application; Figure 2 Fig. 1 is a schematic diagram of the back appearance structure of the present application; Figure 3 Fig. 2 is a schematic diagram of the lower die plate structure of the present application; Figure 4 Fig. 3 is a schematic diagram of the lower die plate driving structure of the present application; Figure 5 Fig. 4 is a schematic diagram of the centrifugal melt cylinder driving structure of the present application; Figure 6 Fig. 5 is a schematic diagram of the hopper structure of the present application; Figure 7 Fig. 6 is a schematic diagram of the cross-section structure of the centrifugal melt cylinder of the present application; Figure 8 Fig. 7 is a schematic diagram of the arc-shaped filter screen structure of the present application.

[0017] Fig. 1 is a schematic diagram of the back appearance structure of the present application; DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] The present application will be described in detail with reference to the drawings. EMBODIMENT

[0020] Please refer to Figure 1 - Figure 8The application provides a kind of injection molding device for bubble type plastic pipe connector, including injection molding machine base 1.The injection molding machine base 1 is the support structure of the whole device, and a lower die plate 2 is rotatably connected thereon.The lower die plate 2 realizes its rotation switching by rotary connection, which enables the device to work continuously, for example, while injection molding is carried out in one station of the lower die plate 2, another station can take parts or replace molds, thereby greatly improving production efficiency.

[0021] A upper die plate 6 is provided above the lower die plate 2, and the upper die plate 6 cooperates with the lower die plate 2 to realize mold clamping.In the injection molding process, the clamping accuracy of the mold directly affects the forming quality of the product.A first lifting seat 8 is provided above the upper die plate 6, and the first lifting seat 8 can drive the whole components such as feeding pipe 10 to lift, so as to adjust the relative position of nozzle 29 and the mold.This lifting design enables the nozzle 29 to accurately align the gate of the mold, ensuring the accuracy of injection.

[0022] A feeding pipe 10 is fixedly connected to the first lifting seat 8, and the feeding pipe 10 is used for conveying plastic raw materials.A hopper 11 is fixedly connected to one side of the first lifting seat 8, and the hopper 11 is used for storing plastic particles.The hopper 11 is communicated with the feeding pipe 10, ensuring that the plastic particle raw materials can smoothly enter the feeding pipe 10.

[0023] A second lifting seat 13 is provided above the first lifting seat 8, and the second lifting seat 13 can drive the upper screw 15 to move axially.A second hydraulic motor 14 is fixedly connected to the second lifting seat 13, and the second hydraulic motor 14 provides rotary power for the upper screw 15.The output end of the second hydraulic motor 14 is fixedly connected with the upper screw 15, and the upper screw 15 moves downward by rotation to push the raw materials.The upper screw 15 is arranged along the axial direction through the feeding pipe 10, and the helical structure of the upper screw 15 can effectively convey the plastic particles in the hopper 11 downward.

[0024] A centrifugal melting cylinder 16 is rotatably connected to the lower end of the feeding pipe 10.The centrifugal melting cylinder 16 is a key component for realizing bubble removal in the application, which generates centrifugal force by high-speed rotation to realize bubble separation in molten plastic.A tapered cylinder 20 is coaxially arranged in the centrifugal melting cylinder 16, and the existence of the tapered cylinder 20 ensures that the centrifugal force can uniformly act on the raw materials, improving the melting and bubble removal effect.A quartz electric heating tube 21 is arranged in the annular gap between the centrifugal melting cylinder 16 and the tapered cylinder 20, and the quartz electric heating tube 21 realizes efficient and uniform heating of the raw materials, promoting the melting of the raw materials, and at the same time, the structure of the centrifugal melting cylinder 16, which is narrow at the top and wide at the bottom, makes the heating temperature of the tapered cylinder 20 gradually increase from top to bottom, so that the plastic particles can experience the process from low-temperature preheating and drying to high-temperature melting, preventing the generation of harmful gases.

[0025] The arc-shaped filter screen 24 is fixed at the bottom edge of the centrifugal melt cylinder 16, and the arc-shaped design of the arc-shaped filter screen 24 is adapted to the direction of the centrifugal force, which can effectively filter impurities in the molten plastic and improve the purity of the raw material. The conical hopper 25 is rotatably connected to the bottom of the centrifugal melt cylinder 16, which is convenient for temporarily storing molten plastic and guiding it to converge to the center. The conical hopper 25 is integrally connected with the bottom of the conical hopper 25. The discharge pipe 26 is used to convey the molten plastic to the nozzle 29. The lower end of the discharge pipe 26 is equipped with the nozzle 29, which realizes the precise injection of the molten plastic.

[0026] The bottom end of the upper screw rod 15 is fixedly connected with the stirring rod 23, which can stir the molten raw material to make it more uniform. The stirring rod 23 penetrates the conical cylinder 20 along the axial direction. The lower end of the stirring rod 23 is fixedly connected with the sliding rod 27, which realizes the injection action by axial movement. The sliding rod 27 penetrates the conical hopper 25 along the axial direction. The lower end of the sliding rod 27 is fixedly connected with the lower screw rod 28, which pushes the molten plastic into the discharge pipe 26 by rotating. The lower screw rod 28 penetrates the discharge pipe 26 along the axial direction. The upper screw rod 15, the stirring rod 23, the sliding rod 27 and the lower screw rod 28 form a coordinated working conveying, stirring and injection system, which ensures the smoothness and efficiency of the whole process from granular to molten to injection of the plastic raw material. Embodiment

[0027] On the basis of embodiment one, the application further provides a preferred structure.

[0028] Please refer to Figure 3 - Figure 5 The lower die plate 2 is disc-shaped, and a first injection molding position 201 is arranged on one side of the lower die plate 2, and a second injection molding position 202 is arranged on the opposite side. The first injection molding position 201 and the second injection molding position 202 are centrally symmetrically distributed around the center of the lower die plate 2. This double-station design allows one station to perform injection molding while the other station can perform mold cooling, mold opening, part removal or mold replacement, etc., thereby realizing alternating injection molding operations, greatly improving production efficiency and reducing idle time of the equipment.

[0029] In order to realize precise rotational switching of the lower die plate 2, a first tooth ring 203 is fixedly connected to the outer side wall of the lower die plate 2. A first hydraulic motor 204 is fixedly connected inside the injection molding machine base 1, which provides a rotating driving force. The output end of the first hydraulic motor 204 is fixedly connected with a first drive gear 205, and the first drive gear 205 is engaged with the first tooth ring 203. Through gear transmission, the first hydraulic motor 204 can drive the lower die plate 2 to rotate accurately and position, ensuring the accuracy of the injection molding position switching, and avoiding production problems caused by inaccurate positioning.

[0030] In order to realize the mold closing and opening action, the lower die plate 2 is provided with a lifting plate 3 below, and the lifting plate 3 is used to install the first hydraulic cylinder 4 and the first guide rod 5. The first hydraulic cylinder 4 is fixedly connected to the lifting plate 3, and the first hydraulic cylinder 4 provides lifting power. The output end of the first hydraulic cylinder 4 is fixedly connected to the bottom of the lower die plate 2, and drives the lower die plate 2 to lift to realize mold closing and opening. The first guide rod 5 is vertically fixed to the lifting plate 3, and the first guide rod 5 ensures the stability and perpendicularity of the lifting movement of the upper die plate 6, and improves the mold closing precision. The upper end of the first guide rod 5 is fixedly connected to the upper die plate 6.

[0031] In a preferred embodiment, the first guide rod 5 is provided with three, and the three first guide rods 5 are distributed in an equilateral triangle. One of the first guide rods 5 penetrates the center of the lower die plate 2 and forms a sliding fit with the lower die plate 2, and the other two first guide rods 5 are symmetrically distributed on the outside of the lower die plate 2. This distribution forms a stable triangular support structure, further enhancing the overall stability of the lower die plate 2 during rotation and the upper die plate 6 during lifting, effectively preventing shaking or deflection that may occur under high-speed or high-pressure operation, thereby ensuring the precision and quality of the injection molded product.

[0032] In order to ensure the precise lifting of the first lifting seat 8, the second guide rod 7 is vertically fixed to the upper die plate 6, and the second guide rod 7 provides guidance for the lifting of the first lifting seat 8, ensuring its movement precision. The upper end of the second guide rod 7 is fixedly connected to the first lifting seat 8. The second hydraulic cylinder 9 is fixedly connected to the upper die plate 6, and the second hydraulic cylinder 9 provides lifting driving force. The output end of the second hydraulic cylinder 9 is fixedly connected to the bottom of the first lifting seat 8, and drives the first lifting seat 8 to lift precisely, ensuring the accurate docking of the nozzle 29 with the mold gate, and avoiding the problems of material leakage or inaccurate injection.

[0033] In order to realize the axial feeding control of the upper screw 15 and related components, the third hydraulic cylinder 12 is fixedly connected to the first lifting seat 8, and the third hydraulic cylinder 12 provides axial driving force. The output end of the third hydraulic cylinder 12 is fixedly connected to the bottom of the second lifting seat 13, realizing the axial feeding control of the upper screw 15 and related components, meeting the accurate regulation and control requirements of material pushing and injection amount, and thus realizing the accurate control of injection amount.

[0034] In order to provide stable rotating power for the centrifugal smelting cylinder 16, the second gear ring 17 is fixedly connected to the upper outer side wall of the centrifugal smelting cylinder 16. The third hydraulic motor 18 is fixedly connected to one side of the first lifting seat 8, and the third hydraulic motor 18 provides rotating power. The output end of the third hydraulic motor 18 is fixedly connected with the second driving gear 19, and the second driving gear 19 is engaged with the second gear ring 17. Through gear transmission, the third hydraulic motor 18 can provide stable rotating power for the centrifugal smelting cylinder 16, and ensure that it obtains sufficient centrifugal force to realize bubble separation, which is the key guarantee of the bubble removal effect of the present application. Embodiment

[0035] On the basis of embodiment two, the present application further provides more optimized structure and working principle.

[0036] Please refer to Figure 7 In order to enhance the heat conduction efficiency, the annular gap between the centrifugal smelting cylinder 16 and the conical cylinder 20 is filled with high thermal conductivity filler. The high thermal conductivity filler completely wraps the quartz electric heating tube 21, which can enhance the heat conduction efficiency, make the heat of the quartz electric heating tube 21 more evenly and quickly transferred to the raw materials, and improve the melting efficiency. This design ensures that the plastic particles can quickly and uniformly reach the molten state, laying the foundation for the subsequent bubble removal and injection process.

[0037] The conical cylinder 20 is in a conical structure with a small upper end diameter and a large lower end diameter, which can make the raw materials gather to the bottom edge with the centrifugal force, enhancing the bubble separation effect. This conical structure uses centrifugal force to extrude the bubbles in the molten plastic to the center area, while the heavier molten plastic is thrown to the outer wall, thereby realizing effective separation of bubbles and molten plastic. The inner wall of the conical cylinder 20 is fixedly connected with the spiral heat conducting sheet 22, which can not only increase the heat conduction area and improve the heating efficiency, but also push the raw materials downward during centrifugal rotation, promoting uniform melting and conveying of the raw materials. The spiral heat conducting sheet 22 not only accelerates heat transfer, but also generates an axial pushing force on the molten plastic through its spiral structure, ensuring smooth flow of the molten plastic in the centrifugal smelting cylinder 16 and further promoting the discharge of bubbles.

[0038] Working principle: When using the injection molding device of the bubble removal type plastic pipe connector, in the initial state, two groups of lower molds of the same specification are respectively installed at the first injection position 201 and the second injection position 202 of the lower mold plate 2, and the matching upper molds are correspondingly installed at the bottom of the upper mold plate 6. The pretreated plastic particle raw materials are put into the hopper 11.

[0039] After starting the device, the first hydraulic cylinder 4 drives the lifting plate 3 to descend in the vertical direction, and the lifting plate 3 drives the upper mold plate 6 to descend synchronously through the first guide rod 5, so as to realize the mold closing action. Then, the second hydraulic cylinder 9 drives the first lifting seat 8 to descend along the second guide rod 7 in the axial direction, so as to accurately align the nozzle 29 with the gate position of the mold.

[0040] The second hydraulic motor 14 drives the upper screw 15 to rotate, and the plastic particles in the hopper 11 fall into the feeding pipe 10 under the action of gravity and fall into the centrifugal melting cylinder 16 under the spiral pushing action of the upper screw 15. At the same time, the third hydraulic motor 18 drives the centrifugal melting cylinder 16 to rotate at high speed through the meshing transmission of the second driving gear 19 and the second tooth ring 17, and uses the centrifugal force to make the plastic particles gather to the inner wall of the centrifugal melting cylinder 16. In this process, the quartz electric heating tube 21 transmits heat to the plastic particles through the high-thermal-conductivity filler, so as to realize the melting of the raw materials. The spiral heat-conducting sheet 22 on the inner wall of the conical cylinder 20 can not only increase the heat exchange area to improve the heat conduction efficiency, but also can form an axial pushing force on the molten raw materials in cooperation with the centrifugal force when the centrifugal melting cylinder 16 rotates, and can generate a gradient centrifugal effect with the conical structure of the centrifugal melting cylinder 16, so as to make the molten plastic gather to the bottom of the centrifugal melting cylinder 16. With the extrusion action of the centrifugal force, the bubbles in the molten plastic migrate to the central area of the centrifugal melting cylinder 16, and finally escape through the feeding pipe 10 and the hopper 11.

[0041] The molten plastic enters the conical hopper 25 after filtering impurities through the arc-shaped filter screen 24. In the injection stage, the third hydraulic cylinder 12 first drives the upper screw 15 to retreat upward, so that the lower screw 28 enters the inside of the conical hopper 25, and the molten plastic is sent into the lower feeding pipe 26 under the spiral conveying action of the lower screw 28. Then, the third hydraulic cylinder 12 drives the upper screw 15 to move downward, and then the molten plastic is injected through the nozzle 29 by the push-in action of the slide rod 27, so as to complete the molding by injecting the molten plastic into the mold cavity.

[0042] When the injection of the first injection position 201 is completed, the first hydraulic cylinder 4 drives the lower mold plate 2 to descend, so as to realize the mold opening. At the same time, the first hydraulic motor 204 drives the first driving gear 205 to mesh with the first tooth ring 203, so as to rotate the lower mold plate 2 by 180 degrees, switch the second injection position 202 to the injection position, and switch the first injection position 201 to the part taking or mold replacing position, so as to realize the continuous and efficient injection molding production.

[0043] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An injection molding apparatus for a bubble-type plastic pipe coupling, comprising an injection molding machine base, characterized in that, The lower mold plate is rotationally connected to the injection molding base, and a upper mold plate is correspondingly arranged above the lower mold plate, a first lifting seat is arranged above the upper mold plate, a feeding pipe is fixedly connected to the first lifting seat, a hopper is fixedly connected to one side of the first lifting seat, the hopper is in communication with the feeding pipe, a second lifting seat is correspondingly arranged above the first lifting seat, a second hydraulic motor is fixedly connected to the second lifting seat, and an upper screw rod is fixedly connected to the output end of the second hydraulic motor. A centrifugal melting cylinder is rotationally connected to the lower end of the feeding pipe, a tapered cylinder is coaxially arranged in the centrifugal melting cylinder, a quartz electric heating pipe is arranged in the annular gap between the centrifugal melting cylinder and the tapered cylinder, an arc-shaped filter screen is fixedly connected to the bottom edge of the centrifugal melting cylinder, a conical material bin is rotationally connected to the bottom of the centrifugal melting cylinder, a discharging pipe is integrally connected to the bottom of the conical material bin, a nozzle is assembled to the lower end of the discharging pipe, a stirring rod is fixedly connected to the bottom end of the upper screw rod, the stirring rod penetrates the tapered cylinder in the axial direction, a sliding rod is fixedly connected to the lower end of the stirring rod, the sliding rod penetrates the conical material bin in the axial direction, a lower screw rod is fixedly connected to the lower end of the sliding rod, and the lower screw rod penetrates the discharging pipe in the axial direction.

2. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 1, wherein: The lower mold plate is disc-shaped, a first injection molding position is arranged on one side of the lower mold plate, and a second injection molding position is arranged on the opposite side, and the first injection molding position and the second injection molding position are centrally symmetrically distributed around the center of the lower mold plate.

3. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 2, wherein: A first tooth ring is fixedly connected to the outer wall of the lower mold plate, a first hydraulic motor is fixedly connected to the inside of the injection molding base, a first driving gear is fixedly connected to the output end of the first hydraulic motor, and the first driving gear is engaged with the first tooth ring.

4. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 1, wherein: A lifting plate is correspondingly arranged below the lower mold plate, a first hydraulic cylinder is fixedly connected to the lifting plate, the output end of the first hydraulic cylinder is fixedly connected to the bottom of the lower mold plate, a first guide rod is fixedly connected to the lifting plate in a vertical manner, and the upper end of the first guide rod is fixedly connected to the upper mold plate.

5. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 4, wherein: The first guide rod is provided with three first guide rods, and the three first guide rods are distributed in an equilateral triangle shape, one of the first guide rods penetrates the center of the lower mold plate and is in sliding fit with the lower mold plate, and the other two first guide rods are symmetrically distributed on the outer side of the lower mold plate.

6. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 1, wherein: A second guide rod is fixedly connected to the upper mold plate in a vertical manner, the upper end of the second guide rod is fixedly connected to the first lifting seat, a second hydraulic cylinder is fixedly connected to the upper mold plate, and the output end of the second hydraulic cylinder is fixedly connected to the bottom of the first lifting seat.

7. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 1, wherein: A third hydraulic cylinder is fixedly connected to the first lifting seat, and the output end of the third hydraulic cylinder is fixedly connected to the bottom of the second lifting seat.

8. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 1, wherein: A second tooth ring is fixedly connected to the outer wall of the upper part of the centrifugal melting cylinder, a third hydraulic motor is fixedly connected to one side of the first lifting seat, a second driving gear is fixedly connected to the output end of the third hydraulic motor, and the second driving gear is engaged with the second tooth ring.

9. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 1, wherein: The annular gap between the centrifugal melting cylinder and the tapered cylinder is filled with high-thermal-conductivity filler, and the high-thermal-conductivity filler completely wraps the quartz electric heating pipe.

10. The injection molding apparatus for a bubble trap type plastic pipe coupling according to claim 1, wherein: The tapered cylinder is in a conical structure with a small upper end diameter and a large lower end diameter, and helical heat-conducting fins are fixedly connected to the inner wall of the tapered cylinder.

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