Injection molding device for pipeline assembly part production

Abstract

The invention discloses an injection molding device for pipeline assembly production, and aims to solve the problems of low raw material preheating efficiency and non-uniform drying of an existing device. The device comprises an injection machine base, a sliding guide rail, a charging barrel, a screw rod, an injection oil cylinder, a hopper, a nozzle and a forming mold, the hopper is provided with a stirring shaft driven by a stirring motor, a stirring rod and a built-in air distribution partition plate which divides a raw material stirring cavity and a hot air buffering cavity, the lower end of the stirring rod is connected with an exhaust fan to drive airflow circulation, the heating ring controls temperature in a segmented mode, and the temperature control barrel is provided with a red copper inner wall and a spiral heat exchange piece. The air inlet is provided with a dustproof cover, an air distribution partition plate is matched with an arc-shaped scraper to prevent blocking, molten waste gas can be recycled, and the device improves the preheating and drying effect, avoids product defects, guarantees quality and reduces energy consumption.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and more particularly to an injection molding apparatus for producing pipe assemblies. Background Technology

[0002] Injection molding technology is one of the main methods in the production of plastic products and is widely used in the mass production of various plastic parts, including pipe assemblies. Although existing injection molding equipment is relatively mature in terms of plastic melting and injection, there are still some technical defects and room for improvement in raw material pretreatment, especially in the drying, preheating and heat transfer efficiency of plastic granules.

[0003] Traditional injection molding equipment typically relies on independent drying equipment or simple hopper heating for raw material preheating. This often results in uneven heating, high energy consumption, and poor preheating effect. If plastic granules are not sufficiently dried and preheated before injection, defects such as bubbles and silver streaks will appear on the surface of the product, affecting product quality and mechanical properties. In particular, for pipe assemblies with high requirements for dimensional accuracy and surface quality, insufficient raw material pretreatment will directly affect the pass rate of the final product. Summary of the Invention

[0004] The technical problem to be solved by this invention is the low preheating efficiency of raw materials in existing injection molding devices. To address this, we propose an injection molding device for producing pipe assemblies.

[0005] To achieve the above objectives, this application adopts the following technical solution: an injection molding device for producing pipe assemblies, comprising a horizontally arranged injection machine base, two parallel sliding guide rails fixedly installed on the injection machine base by bolts, a cylindrical barrel slidably connected to the sliding guide rails by a slider, the barrel axis being consistent with the length direction of the sliding guide rails, a screw coaxially passing through the barrel, the screw and the inner wall of the barrel having clearance fit, an injection cylinder slidably connected to the side of the barrel away from the nozzle on the sliding guide rail by a slider, the cylinder body of the injection cylinder being limited by a positioning pin, the output end of the injection cylinder being fixedly connected to the end of the screw away from the nozzle by a flange, for driving the screw to move along the barrel axis;

[0006] A conical hopper is welded to the top of the barrel near the injection cylinder. The bottom of the hopper is connected to the inside of the barrel to feed plastic raw materials into the barrel. A conical nozzle is connected to the barrel away from the injection cylinder via a threaded seal. An openable molding die is set on the side of the nozzle away from the barrel. The molding die has a cavity that matches the shape of the pipe assembly. The nozzle outlet end is sealed to the cavity inlet.

[0007] A heating ring is fitted along the axial direction on the outer wall of the material cylinder. The heating ring fits tightly against the outer wall of the material cylinder. A temperature control cylinder is fitted coaxially on the outside of the heating ring. Both ends of the temperature control cylinder are sealed to the outer wall of the material cylinder, so that an annular hot air cavity is formed between the temperature control cylinder and the heating ring. An air inlet is opened at one end of the hot air cavity, and an air outlet is connected to the other end of the hot air cavity. The end of the air outlet away from the hot air cavity is sealed to the bottom side wall of the hopper.

[0008] A stirring motor is fixedly installed on the upper part of the hopper by a bracket. The drive shaft of the stirring motor extends downward along the axis of the hopper, and the driving shaft is fixedly connected to the stirring shaft by a coupling. The stirring shaft coaxially passes through the hopper, and the stirring shaft is rotatably connected to the top of the hopper by a sealed bearing. At least three sets of stirring rods are evenly fixedly connected to the shaft section inside the hopper along its circumference. Each set of stirring rods extends radially along the stirring shaft, and the end of the stirring rod away from the stirring shaft is clearance-fitted with the inner wall of the hopper.

[0009] Near the bottom of the hopper, an air distribution baffle is horizontally fixed. The air distribution baffle divides the inside of the hopper into an upper raw material mixing chamber and a lower hot air buffer chamber. The lower end of the mixing rod passes through the air distribution baffle and extends into the hot air buffer chamber.

[0010] The stirring rod is located at the lower end of the hot air buffer chamber and is fixed with an exhaust fan by a key connection. The exhaust fan is coaxial with the stirring shaft and is used to drive the airflow circulation in the hopper.

[0011] Furthermore, the heating coils are electric heating coils, and 3-5 sets are equidistantly arranged along the axial direction of the barrel. Each set of heating coils is electrically connected to an independent temperature control module. The temperature control module can adjust the heating temperature of each set of heating coils individually, so as to achieve gradient temperature control in different areas along the axial direction of the barrel, adapt to the melting temperature curve of different plastic raw materials, and avoid local overheating or insufficient melting of the raw materials.

[0012] Furthermore, the inner wall of the temperature control cylinder is made of copper, and the inner wall of the temperature control cylinder is tightly fitted to the outer wall of the heating coil. The high thermal conductivity of copper is used to efficiently transfer the heat from the heating coil to the hot air cavity. Spiral heat exchange fins are welded along the axial direction of the inner wall of the temperature control cylinder. The spiral heat exchange fins are adapted to the hot air cavity to increase the contact area with the air in the hot air cavity and improve the heat exchange efficiency. The outer wall of the temperature control cylinder is wrapped with a heat insulation layer made of aluminum silicate cotton with a thickness of 20-30mm. This layer is used to reduce the heat loss from the hot air cavity to the outside and reduce energy consumption.

[0013] Furthermore, a dust cover is detachably and securely connected to the air inlet via threads. The dust cover has a multi-layer metal filter structure with a mesh size of 80-120 mesh, and an activated carbon adsorption layer is filled between adjacent filter screens. The dust cover is used to filter dust and impurities in the outside air, and at the same time removes moisture from the air through the activated carbon adsorption layer, preventing dust from entering the hot air chamber and contaminating the hot air, or moisture from affecting the preheating and drying effect of the raw materials.

[0014] Furthermore, the air distribution baffle is made of stainless steel with a thickness of 5-8mm. The air distribution baffle has a dense array of ventilation holes in a ring. The diameter of the ventilation holes is 1-2mm, which is smaller than the minimum particle size of the plastic particles to be processed. This ensures that hot air can be evenly penetrated into the plastic particle pile in the raw material mixing chamber through the ventilation holes, while preventing plastic particles from falling into the hot air buffer chamber and blocking the airflow channel.

[0015] Furthermore, a cylindrical first feeding cylinder is connected to the center of the air distribution baffle and fixed with bolts. The first feeding cylinder is coaxially arranged with the stirring shaft, and the stirring shaft passes through the first feeding cylinder and is in clearance fit with the inner wall of the first feeding cylinder. A cylindrical second feeding cylinder is coaxially arranged below the first feeding cylinder, and the lower end of the second feeding cylinder is connected to the top of the feeding cylinder.

[0016] Furthermore, at least two sets of arc-shaped scrapers are provided on the upper surface of the air distribution baffle. The arc-shaped scrapers are fixedly connected to the stirring shaft and are distributed symmetrically at a center of 180°. The arc-shaped scrapers are made of polytetrafluoroethylene with a smooth surface, and the gap between the lower surface of the arc-shaped scraper and the upper surface of the air distribution baffle is no more than 0.5mm. When the arc-shaped scrapers rotate with the stirring shaft, they can scrape off the plastic particles accumulated on the upper surface of the air distribution baffle to prevent the particles from clumping and blocking the air vents. At the same time, they push the particles towards the first feeding cylinder in the center to ensure uniform and smooth feeding.

[0017] Furthermore, an exhaust fan is disposed between the first and second feeding cylinders, and the outer ring of the exhaust fan is rotatably connected to the lower outer wall of the first feeding cylinder and the upper outer wall of the second feeding cylinder respectively through deep groove ball bearings.

[0018] A sealing ring is provided between the inner ring of the bearing and the outer wall of the first and second feed cylinders to prevent hot air or exhaust gas from leaking from the bearing gap and to ensure airflow circulation efficiency.

[0019] The hub of the exhaust fan is fixedly connected to the stirring shaft via a key connection, and rotates synchronously with the stirring shaft, driving the airflow in the hot air buffer chamber to flow upward.

[0020] Furthermore, a fan-shaped discharge hole is provided at the hub of the exhaust fan to allow plastic granules to pass through.

[0021] Furthermore, the side wall of the second feed cylinder is provided with dense ventilation holes along its axial direction. The diameter of the ventilation holes is 1 to 1.5 mm, and the inclination angle is 30 to 45°. The openings face away from the feed cylinder.

[0022] The vent is used to allow the waste gas generated when the plastic granules are heated and melted in the barrel to pass through. After the waste gas enters the hot air buffer chamber through the vent, it is driven upward by the exhaust fan and mixes with the hot air transported by the hot air chamber. Together, they preheat and dry the plastic granules in the hopper, while realizing the recycling and efficient discharge of waste gas, and avoiding the retention of waste gas from affecting the quality of raw materials.

[0023] The technical effects and advantages of this invention are as follows:

[0024] 1. This invention achieves uniform preheating and drying of plastic granules by setting an annular hot air cavity on the outer wall of the barrel and efficiently transferring the heat from the heating coil to the air inside the hot air cavity through the temperature control cylinder. The hot air is then introduced into the hot air buffer cavity at the bottom of the hopper through the air outlet pipe, and the hot air is circulated in the raw material stirring cavity inside the hopper by the exhaust fan at the lower end of the stirring shaft. This design makes heat transfer more efficient and ensures sufficient contact between the hot air and the granules, significantly improving the preheating and drying effect and avoiding problems such as local overheating or uneven drying, thereby ensuring the quality of injection molded products.

[0025] 2. The exhaust fan not only drives the hot air to circulate in the hopper, but also draws the exhaust gas generated during the plastic melting or preheating process into the circulating airflow through the vent holes on the side wall. After these exhaust gases are mixed with the hot air, they can be used together to preheat and dry the plastic particles in the hopper, realizing the reuse of exhaust gas. At the same time, through the reflux of the hot air chamber and an appropriate exhaust mechanism, the exhaust gas can be efficiently discharged, avoiding stagnation that affects the quality of the raw materials. Attached Figure Description

[0026] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0027] Figure 1 This is a schematic diagram of the front structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the injection molding structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the spiral heat exchanger structure of the present invention;

[0031] Figure 5 This is a schematic cross-sectional view of the barrel structure of the present invention;

[0032] Figure 6 This is a cross-sectional side view of the present invention;

[0033] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle;

[0034] Figure 8 This is a schematic diagram of the air distribution baffle and exhaust fan structure of the present invention;

[0035] Figure 9 This is a schematic diagram of the exhaust fan structure of the present invention.

[0036] Legend: 1. Injection molding machine base; 2. Sliding guide rail; 3. Barrel; 4. Screw; 5. Injection cylinder; 6. Hopper; 7. Nozzle; 8. Molding mold; 9. Heating coil; 10. Temperature control cylinder; 11. Hot air chamber; 12. Spiral heat exchange plate; 13. Air inlet; 14. Dust cover; 15. Air outlet pipe; 16. Agitator motor; 17. Agitator shaft; 18. Agitator rod; 19. Air distribution baffle; 20. Arc-shaped scraper; 21. First discharge barrel; 22. Second discharge barrel; 23. Exhaust fan; 2301. Discharge hole. Detailed Implementation

[0037] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Example 1

[0039] like Figure 1-9 As shown, the present invention provides an injection molding apparatus for producing pipe assemblies, which includes a horizontally arranged injection base 1. Two parallel sliding guide rails 2 are fixedly installed on the injection base 1 by bolts. A cylindrical material cylinder 3 is slidably connected to the sliding guide rails 2 by a slider. The axis of the material cylinder 3 is consistent with the length direction of the sliding guide rails 2. A screw 4 is coaxially inserted inside the material cylinder 3. The screw 4 is clearance-fitted with the inner wall of the material cylinder 3 to ensure good sealing during rotation and reciprocating motion.

[0040] On the sliding guide rail 2, on the side of the barrel 3 away from the nozzle 7, an injection cylinder 5 is also slidably connected via a slider. The cylinder body of the injection cylinder 5 is limited to the injection base 1 by a positioning pin to ensure its stability during operation. The output end of the injection cylinder 5 is fixedly connected to the end of the screw 4 away from the nozzle 7 via a flange, and is used to drive the screw 4 to reciprocate along the axis of the barrel 3 to realize the plasticization, metering and injection of plastic.

[0041] At the top of the material cylinder 3, near the injection cylinder 5, a conical hopper 6 is fixed by welding. The bottom of the hopper 6 is connected to the inside of the material cylinder 3 through an opening for conveying plastic raw material granules to be processed into the material cylinder 3. At the end of the material cylinder 3 away from the injection cylinder 5, a conical nozzle 7 is connected by a threaded seal. An openable molding die 8 is provided on the side of the nozzle 7 away from the material cylinder 3. The molding die 8 has a cavity that matches the shape of the required pipe assembly. During injection, the outlet end of the nozzle 7 is sealed and connected to the inlet of the cavity to inject molten plastic into the mold cavity.

[0042] To efficiently heat the material cylinder 3 and preheat the raw materials, a heating ring 9 is fitted along the axial direction on the outer wall of the material cylinder 3. The heating ring 9 fits tightly against the outer wall of the material cylinder 3 to ensure effective heat transfer. A temperature control cylinder 10 is coaxially fitted on the outer side of the heating ring 9, and both ends of the temperature control cylinder 10 are sealed to the outer wall of the material cylinder 3. In this way, an annular hot air cavity 11 is formed between the temperature control cylinder 10 and the heating ring 9. One end of the hot air cavity 11 has an air inlet 13 for drawing in external air, and the other end of the hot air cavity 11 is connected to an air outlet pipe 15. The end of the air outlet pipe 15 away from the hot air cavity 11 is sealed and connected to the bottom side wall of the hopper 6 to guide hot air into the hopper 6.

[0043] At the upper part of the hopper 6, a stirring motor 16 is fixedly installed by a bracket. The drive shaft of the stirring motor 16 extends downward along the axial direction of the hopper 6, and the drive shaft is fixedly connected to the stirring shaft 17 by a coupling. The stirring shaft 17 coaxially passes through the hopper 6, and the stirring shaft 17 is rotatably connected to the top of the hopper 6 by a sealed bearing to ensure that the stirring shaft 17 will not leak material when rotating at high speed. The stirring shaft 17 is located on the shaft section inside the hopper 6, and at least three sets of stirring rods 18 are evenly fixedly connected along its circumference. Each set of stirring rods 18 extends radially along the stirring shaft 17, and the end of the stirring rod 18 away from the stirring shaft 17 is clearance-fitted with the inner wall of the hopper 6 to ensure that the plastic particles in the hopper 6 can be fully stirred.

[0044] Near the bottom of the hopper 6, a horizontally fixed air distribution baffle 19 is installed. This baffle divides the internal space of the hopper 6 into an upper raw material mixing chamber and a lower hot air buffer chamber. The lower end of the stirring rod 18 passes through the air distribution baffle 19 and extends into the hot air buffer chamber. The lower end of the stirring rod 18 is located in the hot air buffer chamber and is fixedly connected to an exhaust fan 23 by a key. The exhaust fan 23 is coaxially arranged with the stirring shaft 17. Driven by the stirring motor 16, the exhaust fan 23 rotates together with the stirring shaft 17 to drive the airflow circulation in the hopper 6. It forcefully draws hot air from the hot air buffer chamber into the raw material mixing chamber for heat exchange, forming a preheating and drying circulating airflow.

[0045] Example 2

[0046] Based on Example 1, combined with Figure 5 The heating coils 9 are electric heating coils, and 3-5 sets are equidistantly arranged along the axial direction of the barrel 3 to achieve more precise temperature control. Each set of heating coils 9 is electrically connected to an independent temperature control module, which can individually adjust the heating temperature of each set of heating coils 9. Through this segmented and independent temperature control method, gradient temperature control can be achieved in different areas along the axial direction of the barrel 3, thereby adapting to the melting temperature curves of different plastic raw materials, avoiding local overheating and degradation or insufficient melting of the raw materials, and further improving plasticizing quality and efficiency. For example, the temperature in the area near the nozzle 7 can be slightly higher, while the temperature in the area away from the nozzle 7 can be slightly lower, gradually increasing so that the plastic particles reach a uniform melting state before entering the nozzle 7.

[0047] Furthermore, the inner wall of the temperature control cylinder 10 is preferably made of copper, and the inner wall of the temperature control cylinder 10 is tightly fitted with the outer wall of the heating coil 9. This utilizes the high thermal conductivity of copper to efficiently transfer the heat generated by the heating coil 9 to the air in the hot air cavity 11. A spiral heat exchange plate 12 is welded along its axial direction on the inner wall of the temperature control cylinder 10. The height and pitch of the spiral heat exchange plate 12 are adapted to the annular space of the hot air cavity 11 to increase the contact area with the air in the hot air cavity 11, forming a longer heat exchange path, thereby significantly improving the heat exchange efficiency. This allows the air to fully absorb heat when passing through the hot air cavity 11, forming high-temperature hot air. In order to reduce heat loss and improve energy utilization, the outer wall of the temperature control cylinder 10 is wrapped with a heat insulation layer, which is preferably made of aluminum silicate cotton with a thickness of 20-30mm. This is used to minimize the heat loss from the hot air cavity 11 to the outside and reduce energy consumption.

[0048] Furthermore, such as Figure 3As shown, a dust cover 14 is detachably and securely connected to the air inlet 13 via threads. This dust cover 14 has a unique structure, consisting of a multi-layer metal filter with a mesh size of 80-120, ensuring effective filtration of fine particles in the air. More importantly, an activated carbon adsorption layer is filled between adjacent filter screens. This composite structure allows the dust cover 14 to not only filter dust and impurities from the outside air, but also effectively remove moisture from the air through the activated carbon adsorption layer. This prevents dust from entering the hot air chamber 11 and contaminating the hot air, or moisture from affecting the preheating and drying effect of the plastic raw materials in the hopper 6, ensuring the purity and dryness of the raw materials, which is crucial to the quality of the final pipeline assembly.

[0049] Example 3

[0050] Based on the above embodiments, combined with Figure 7 and Figure 8 The air distribution baffle 19 is a key component inside the hopper 6. The air distribution baffle 19 is preferably made of stainless steel with a thickness of 5-8 mm to ensure its mechanical strength and corrosion resistance. The air distribution baffle 19 has densely packed ventilation holes arranged in a ring array. The diameter of the ventilation holes is 1-2 mm, and the hole diameter is designed to be smaller than the minimum particle size of the plastic particles to be processed. This design ensures that hot air can be evenly penetrated into the plastic particle pile in the raw material mixing chamber through the ventilation holes for efficient heat exchange and drying. At the same time, it prevents plastic particles from falling into the hot air buffer chamber and blocking the airflow channel, thus affecting the hot air circulation.

[0051] A cylindrical first feeding cylinder 21 is bolted through and fixed to the center of the air distribution baffle 19. The first feeding cylinder 21 is coaxially arranged with the stirring shaft 17, and the stirring shaft 17 passes through the first feeding cylinder 21 and is clearance-fitted with the inner wall of the first feeding cylinder 21 to ensure smooth rotation of the stirring shaft 17. A cylindrical second feeding cylinder 22 is coaxially arranged below the first feeding cylinder 21, and the lower end of the second feeding cylinder 22 is connected to the top of the cylinder 3 to provide a smooth feeding channel for the preheated and dried plastic granules.

[0052] To further optimize the raw material processing inside the hopper 6, at least two sets of arc-shaped scrapers 20 are provided on the upper surface of the air distribution baffle 19. These arc-shaped scrapers 20 are fixedly connected to the stirring shaft 17 and are preferably distributed symmetrically at a center of 180°, so that they can act evenly on the surface of the air distribution baffle 19 when rotating. The arc-shaped scrapers 20 are made of polytetrafluoroethylene and have a smooth surface, ensuring low friction on the plastic particles and preventing wear. The gap between the lower surface of the arc-shaped scraper 20 and the upper surface of the air distribution baffle 19 is no more than 0.5mm. When the stirring shaft 17 rotates, the arc-shaped scrapers 20 can scrape off the plastic particles accumulated on the upper surface of the air distribution baffle 19, preventing the particles from clumping and blocking the ventilation holes. At the same time, the particles are pushed towards the first discharge cylinder 21 in the center, ensuring uniform and smooth discharge and avoiding blockage.

[0053] like Figure 7 and Figure 8 As shown, the exhaust fan 23 is disposed between the first feeding cylinder 21 and the second feeding cylinder 22. The outer ring of the exhaust fan 23 is rotatably connected to the lower outer wall of the first feeding cylinder 21 and the upper outer wall of the second feeding cylinder 22 respectively through deep groove ball bearings. A sealing ring is provided between the inner ring of the bearing and the outer wall of the first feeding cylinder 21 and the second feeding cylinder 22 to prevent hot air or exhaust gas from leaking from the bearing gap, ensuring airflow circulation efficiency and improving energy utilization. The hub of the exhaust fan 23 is fixedly connected to the stirring shaft 17 through a key connection and rotates synchronously with the stirring shaft 17, driving the airflow in the hot air buffer chamber to flow upward, forcing the hot air to pass through the ventilation holes in the air distribution baffle 19 and exchange heat with the plastic particles in the hopper 6. A fan-shaped feeding hole 2301 is provided at the hub of the exhaust fan 23 for the plastic particles to pass through, ensuring that the particles can still move smoothly downward when the exhaust fan 23 is working.

[0054] Furthermore, the second feeding cylinder 22 has densely packed ventilation holes inclined along its axial direction on its side wall. The diameter of these ventilation holes is 1-1.5 mm, and the inclination angle is 30-45°, with the openings facing away from the feeding cylinder 3. These ventilation holes are crucial for allowing the waste gas generated during the heating and melting of the plastic granules in the feeding cylinder 3 to pass through. After entering the hot air buffer chamber through the ventilation holes, this waste gas is driven upward by the exhaust fan 23 and mixes with the hot air delivered by the hot air chamber 11 to preheat and dry the plastic granules in the hopper 6. This achieves the recycling of waste gas, reduces energy waste, and also achieves effective discharge of waste gas, avoiding the impact of waste gas retention on raw material quality. This has positive significance for environmental protection and product quality.

[0055] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An injection molding apparatus for pipe assembly production, characterized by, The utility model provides an injection machine seat is arranged horizontally, two parallel sliding rails are fixedly installed on the injection machine seat through bolt, cylindrical barrel is slidably connected on the sliding rail through the sliding block, the barrel axis is consistent with the length direction of sliding rail, the screw rod is coaxially penetrated in the barrel, the screw rod and the clearance fit of barrel inner wall, the sliding rail is also slidably connected with injection oil cylinder through the sliding block on the side of barrel away from nozzle, the cylinder body of injection oil cylinder is limited through the positioning pin with injection machine seat, and the output end of injection oil cylinder is fixedly connected with the one end of screw rod away from nozzle through flange; The one end of barrel top close to injection oil cylinder is fixedly provided with conical hopper through welding, and the bottom of hopper is communicated with the inside of barrel, the one end of barrel away from injection oil cylinder is fixedly provided with conical nozzle through thread sealing, the side of nozzle away from barrel is provided with open-close forming mould, the forming mould is provided with cavity matched with the shape of pipeline assembly, and the outlet end of nozzle is sealingly connected with the cavity inlet. The outer wall of barrel is provided with heating ring along the axial direction, the heating ring is closely attached to the outer wall of barrel, the heating ring is coaxially provided with temperature control cylinder outside, and the both ends of temperature control cylinder are sealingly connected with the outer wall of barrel, so that annular hot air cavity is formed between temperature control cylinder and heating ring, one end of hot air cavity is provided with air inlet, the other end of hot air cavity is connected with air outlet pipe, and the bottom side wall of hopper is sealingly communicated with the end of air outlet pipe away from hot air cavity. The upper portion of hopper is fixedly provided with stirring motor through support, the driving shaft of stirring motor extends downward along the axial direction of hopper, and the driving shaft is fixedly connected with stirring shaft through coupling, the stirring shaft is coaxially penetrated through hopper, and the stirring shaft is rotatably connected with the top of hopper through sealing bearing, the shaft section of stirring shaft in the inside of hopper is uniformly fixedly connected with at least three groups of stirring rods along the circumferential direction, each group of stirring rods extends along the radial direction of stirring shaft, and the one end of stirring rod away from stirring shaft is clearance fitted with the inner wall of hopper. The inside of hopper is horizontally fixedly provided with air distribution baffle close to the bottom, the air distribution baffle divides the inside of hopper into raw material stirring cavity in the upper portion and hot air buffer cavity in the lower portion, and the lower end of stirring rod penetrates through air distribution baffle and extends into hot air buffer cavity. The lower end of stirring rod in hot air buffer cavity is fixedly provided with air suction fan through key connection, and the air suction fan is coaxially arranged with stirring shaft.

2. An injection molding apparatus for producing a pipe assembly according to claim 1, wherein The heating ring is electric heating ring, and 3-5 groups of heating rings are equidistantly arranged along the axial direction of barrel, each group of heating rings is electrically connected to independent temperature control module, and the temperature control module can individually adjust the heating temperature of each group of heating rings.

3. An injection molding apparatus for producing a pipe assembly according to claim 1, wherein The inner wall of temperature control cylinder is made of red copper, and the inner wall of temperature control cylinder is closely attached to the outer wall of heating ring, the inner wall of temperature control cylinder is welded with spiral heat exchange fins along the axial direction, the spiral heat exchange fins are matched with hot air cavity, and the outer wall of temperature control cylinder is wrapped with heat insulation layer, and the heat insulation layer is made of aluminum silicate cotton.

4. An injection molding apparatus for producing a pipe assembly according to claim 1, wherein The dust cover is detachably fixedly connected with the air inlet through thread, the dust cover is multilayer metal screen structure, the screen mesh number is 80-120 meshes, and the adjacent screens are filled with activated carbon adsorption layer.

5. An injection molding apparatus for producing a pipe assembly according to claim 1, wherein The air distribution baffle is made of stainless steel and has a thickness of 5-8 mm, and dense air holes are arranged in a ring array on the air distribution baffle.

6. An injection molding apparatus for producing a pipe assembly according to claim 1, wherein A cylindrical first discharging cylinder is fixedly connected to the center of the air distribution baffle through penetration by a bolt, the first discharging cylinder is coaxially arranged with the stirring shaft, the stirring shaft penetrates the first discharging cylinder and is in clearance fit with the inner wall of the first discharging cylinder, and a cylindrical second discharging cylinder is coaxially arranged below the first discharging cylinder and is in communication with the top of the first discharging cylinder.

7. An injection molding apparatus for producing a pipe assembly according to claim 6, wherein At least two groups of arc-shaped scrapers are arranged on the upper surface of the air distribution baffle, the arc-shaped scrapers are fixedly connected with the stirring shaft and are symmetrically distributed at the center by 180°, the arc-shaped scrapers are made of polytetrafluoroethylene and have smooth surfaces, and the clearance between the lower surface of the arc-shaped scraper and the upper surface of the air distribution baffle is not greater than 0.5 mm.

8. An injection molding apparatus for producing a pipe assembly according to claim 7, wherein The air suction fan is arranged between the first discharging cylinder and the second discharging cylinder, and the outer ring of the air suction fan is rotatably connected with the outer wall of the lower end of the first discharging cylinder and the outer wall of the upper end of the second discharging cylinder through deep groove ball bearings, respectively. A sealing ring is arranged between the inner ring of the bearing and the outer wall of the first discharging cylinder and the second discharging cylinder. The hub of the air suction fan is fixedly connected with the stirring shaft through key connection and rotates synchronously with the stirring shaft.

9. An injection molding apparatus for producing a pipe assembly according to claim 8, wherein A fan-shaped discharging hole is arranged at the hub of the air suction fan.

10. An injection molding apparatus for producing a pipe assembly according to claim 9, wherein Dense air holes are obliquely arranged on the side wall of the second discharging cylinder along the axial direction.

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