Flaring extrusion injection molding device with precise pressure maintaining control

Abstract

The invention provides a precise pressure maintaining control flaring extrusion injection molding device, and relates to the technical field of extrudes.The precise pressure maintaining control flaring extrusion injection molding device comprises a pressure maintaining injection device arranged between a nozzle and a machine barrel, and the pressure maintaining injection device comprises a barrel body, a flow guide sleeve mechanism and a pressure maintaining injection mechanism; the feeding end and the discharging end of the barrel body are respectively connected with the machine barrel and the nozzle; the flow guide sleeve mechanism is arranged in the cylinder in the axial direction, a flow dividing cavity is defined by the flow guide sleeve mechanism and the inner wall of the cylinder, a material storage cavity communicated with the flow dividing cavity is formed in the flow guide sleeve mechanism, and the material storage cavity is communicated with the nozzle; the pressure maintaining injection mechanism is arranged in the flow guide sleeve mechanism, the injection end of the pressure maintaining injection mechanism is arranged in the material storage cavity, and materials in the material storage cavity can be pushed to the nozzle; the pressure maintaining injection device is arranged between the machine barrel and the nozzle, the injection molding pressure can be effectively controlled, accurate and stable constant-pressure plastic repair can be achieved, the problems of mold expansion, flash and the like can be effectively solved, and therefore the product quality and the production efficiency are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of extruders, and in particular to a precise pressure-maintaining controlled flaring extrusion injection molding device. Background Art

[0002] In the production process of large steel-reinforced polyethylene spiral corrugated pipes, the expansion process is a crucial link, which has a direct impact on the quality and performance of the product. However, the currently widely used extrusion injection molding device often finds it difficult to achieve precise constant pressure plastic filling during the process of injection molding to pressure holding. This technical difficulty often leads to quality problems such as mold expansion and flash in the product. At the same time, the traditional single-screw extruder also has significant limitations in the control of expansion accuracy. Its unique intermittent motion mode and the rapid change of screw speed make the control of the production process more complicated and difficult.

[0003] The existence of these technical difficulties not only affects the appearance quality and dimensional accuracy of the product, but may also cause warping and dimensional shrinkage during the middle and late use of the product, which has a serious impact on installation and fit. Especially in the injection molding process, the process of switching from the injection molding stage to the pressure holding stage has a decisive influence on the internal quality and mechanical properties of the injection molded product, especially the impact strength. The combined effect of multiple factors such as internal stress orientation, temperature change and deformation induction during this conversion process jointly determines the impact strength of the product and makes it anisotropic. Therefore, to some extent, the impact strength of the product can be regarded as an important indicator of its melt uniformity.

[0004] Therefore, in order to effectively solve the above problems, the present invention proposes a flaring extrusion injection molding device capable of achieving precise pressure holding control. Summary of the invention

[0005] The purpose of the present invention is to provide a flaring extrusion injection molding device with precise pressure holding control to solve the above-mentioned technical problems existing in the prior art; the preferred technical scheme among the many technical schemes provided by the present invention can produce many technical effects; see the detailed description below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a precisely pressure-maintaining controlled flaring extrusion injection molding device, comprising a pressure-maintaining injection device arranged between a nozzle and a barrel, the pressure-maintaining injection device comprising a barrel, a guide sleeve mechanism and a pressure-maintaining injection mechanism, wherein: the feed end and the discharge end of the barrel are respectively connected to the barrel and the nozzle; the guide sleeve mechanism is axially arranged inside the barrel, and forms a diversion cavity with the inner wall of the barrel, a storage cavity is arranged inside the guide sleeve mechanism and is connected to the diversion cavity, and the storage cavity is connected to the nozzle; the pressure-maintaining injection mechanism is arranged in the guide sleeve mechanism, the injection end of the pressure-maintaining injection mechanism is arranged in the storage cavity, and can push the material in the storage cavity to the nozzle.

[0008] Preferably, the guide sleeve mechanism includes a diverter cone and a sleeve assembly, wherein: the diverter cone is arranged on the outside of the sleeve assembly and close to one end of the barrel, and a first thermal insulation gap is arranged between the diverter cone and the sleeve assembly; the storage chamber is arranged inside the sleeve assembly and close to one end of the nozzle.

[0009] Preferably, the guide sleeve mechanism includes an annular diverter bracket, wherein: the annular diverter bracket is arranged in the diverter cavity and close to one side of the barrel, the annular diverter bracket is sleeved on the sleeve body assembly, and a plurality of diverter ports are evenly arranged on the annular diverter bracket along the circumferential direction.

[0010] Preferably, a plurality of sieve holes are provided on the peripheral wall of the sleeve assembly and communicated with the material storage cavity; and all the sieve holes are evenly distributed along the circumferential direction.

[0011] Preferably, the pressure-maintaining injection mechanism includes a cylinder body, a piston assembly and a plunger, wherein: the cylinder body is arranged inside the guide sleeve mechanism; the piston end of the piston assembly is inserted into the cylinder body and slidingly cooperates with the cylinder body, the piston end of the piston assembly divides the cylinder body into a first piston chamber and a second piston chamber, the first piston chamber and the second piston chamber are respectively connected to the first oil pipe and the second oil pipe, the connecting rod end of the piston assembly is inserted into the storage chamber and connected to the plunger; the plunger slides with the storage chamber.

[0012] Preferably, a second thermal insulation gap is provided between the outer wall of the cylinder body and the inner wall of the guide sleeve mechanism.

[0013] Preferably, the pressure-maintaining injection device further comprises a cooling mechanism, and the cooling mechanism comprises a spiral water jacket, wherein: the spiral water jacket is arranged in the second thermal insulation gap and is sleeved on the cylinder body; the spiral water jacket is connected to a first liquid pipe and a second liquid pipe.

[0014] Preferably, the pressure-maintaining injection device comprises a pressure detection unit, wherein: a detection end of the pressure detection unit is arranged in the material storage cavity, and is used for detecting the injection pressure of the material in the material storage cavity.

[0015] Preferably, the precise pressure-maintaining controlled flaring extrusion injection molding device comprises a supporting device, a screw feeding device and a nozzle, wherein: the screw feeding device comprises a barrel, a feed hopper and a screw driving mechanism, the feed hopper is arranged on the barrel for feeding, the screw driving mechanism is connected to the barrel for conveying the material in the barrel, and the barrel is connected to the nozzle through the pressure-maintaining injection device.

[0016] Preferably, the precise pressure-maintaining controlled expanding extrusion injection molding device comprises a control device, and the screw feeding device and the pressure-maintaining injection device are both electrically connected to the control device.

[0017] The invention provides a precise pressure-holding controlled flaring extrusion injection molding device which has at least the following beneficial effects:

[0018] The precise pressure-maintaining controlled expanding extrusion injection molding device comprises a pressure-maintaining injection device arranged between a nozzle and a barrel, the barrel is used for conveying materials, the nozzle is used for material injection molding, and the pressure-maintaining injection device is used for controlling the injection pressure of the materials.

[0019] The pressure-maintaining injection device includes a barrel, a guide sleeve mechanism and a pressure-maintaining injection mechanism. The feed end and the discharge end of the barrel are connected to the barrel and the nozzle respectively; the guide sleeve mechanism is axially arranged inside the barrel and forms a diversion cavity with the inner wall of the barrel. A storage cavity is arranged in the guide sleeve mechanism and is connected to the diversion cavity. The storage cavity is connected to the nozzle. The pressure-maintaining injection mechanism is arranged in the guide sleeve mechanism. The injection end of the pressure-maintaining injection mechanism is arranged in the storage cavity and can push the material in the storage cavity to the nozzle. When working, the barrel conveys the material to the pressure-maintaining injection device, and the material enters the storage cavity after passing through the diversion cavity. After that, the injection end of the pressure-maintaining injection mechanism pushes the material in the storage cavity to the nozzle, thereby realizing extrusion injection molding. In this process, the pressure-maintaining injection device is used to effectively control the injection pressure and realize precise constant pressure plastic replenishment, thereby ensuring production quality and production efficiency.

[0020] The present invention can effectively control the injection pressure by arranging a pressure-maintaining injection device between the barrel and the nozzle, realize accurate and stable constant-pressure plastic replenishment, and effectively solve problems such as mold expansion and flash, thereby ensuring product quality and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 and Figure 2 It is a schematic diagram of the structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the material flow state inside the pressure-maintaining injection device of the present invention;

[0024] Figure 4 It is a schematic structural diagram of the pressure-maintaining injection device of the present invention;

[0025] Figure 5 is a cross-sectional schematic diagram of the annular shunt stent at position AA of the present invention;

[0026] Figure 6 It is a schematic cross-sectional view of the oil and water circuits at position AA of the present invention;

[0027] Figure 7 It is a schematic cross-sectional view of the front cover portion of the sleeve assembly of the present invention.

[0028] Reference numerals

[0029] 1. Nozzle; 2. Pressure-maintaining injection device; 21. Cylinder; 22. Guide sleeve mechanism; 221. Diverter cone; 222. Sleeve assembly; 2221. First thermal insulation gap; 2222. Sieve hole; 2223. Second thermal insulation gap; 223. Annular diverter bracket; 2231. Diverter port; 23. Pressure-maintaining injection mechanism; 231. Cylinder; 2311. First piston chamber; 2312. Second piston chamber; 2313. First oil pipe; 2314, second oil pipe; 232, piston body; 233, piston connecting rod; 234, plunger; 24, diversion chamber; 25, storage chamber; 26, cooling mechanism; 261, spiral water jacket; 262, first liquid pipe; 263, second liquid pipe; 27, pressure detection unit; 3, spiral conveying device; 31, barrel; 32, feed hopper; 33, spiral driving mechanism; 4, supporting device; 5, control device; 51, industrial controller. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] The present invention provides a precise pressure-holding controlled expansion extrusion injection molding device, referring to Figures 1 to 7 As shown, the precise pressure-maintaining controlled expanding extrusion injection molding device includes a pressure-maintaining injection device 2 arranged between the nozzle 1 and the barrel 31 , and the pressure-maintaining injection device 2 includes a barrel 21 , a guide sleeve mechanism 22 and a pressure-maintaining injection mechanism 23 .

[0033] The feed end of the cylinder 21 is connected to the barrel 31, and the discharge end of the cylinder 21 is connected to the nozzle 1; the guide sleeve mechanism 22 is arranged inside the cylinder 21, and is coaxially arranged with the cylinder 21. The guide sleeve mechanism 22 and the inner wall of the cylinder 21 surround a diversion chamber 24, and the diversion chamber 24 is an annular chamber. A storage chamber 25 is arranged inside the guide sleeve mechanism 22 and connected to the diversion chamber 24, and the storage chamber 25 is connected to the nozzle 1.

[0034] The pressure-maintaining injection mechanism 23 is disposed in the guide sleeve mechanism 22 , and the injection end of the pressure-maintaining injection mechanism 23 is disposed in the material storage chamber 25 , and can push the material in the material storage chamber 25 to the nozzle 1 .

[0035] During operation, the material conveyed in the barrel 31 is conveyed to the nozzle 1 under pressure through the pressure-maintaining injection device 2, thereby achieving extrusion injection molding.

[0036] In the process of the material flowing through the pressure-maintaining injection device 2 , the material first enters the storage chamber 25 through the diversion chamber 24 , and then the injection end of the pressure-maintaining injection mechanism 23 is actuated to push the material in the storage chamber 25 into the nozzle 1 .

[0037] The present invention adopts a pressure-maintaining injection method, has a good pressure-maintaining effect, and can achieve accurate and stable constant-pressure plastic replenishment, thereby solving problems such as mold expansion and flash, and can significantly improve product quality and ensure production efficiency.

[0038] Embodiment 2:

[0039] Example 2 is based on Example 1:

[0040] like Figures 1 to 7As shown, the guide sleeve mechanism 22 includes a splitter cone 221 and a sleeve assembly 222, and the sleeve assembly 222 includes a sleeve front section, a front cover, a rear cover and a sleeve rear section, wherein the front cover and the rear cover are respectively arranged at the two ends of the sleeve front section, wherein the front cover is located at one end of the sleeve front section close to the barrel 31, and the rear cover is located at one end of the sleeve front section close to the nozzle 1, and the sleeve rear section is connected to the rear cover.

[0041] The diverter cone 221 is arranged outside the sleeve assembly 222 and connected to the front cover. The diameter of the diverter cone 221 gradually increases in the direction away from the barrel 31. The diverter cone 221 is arranged in a cone shape or a spherical shape, so that the material melt can be effectively converted into an annular melt.

[0042] A first thermal insulation gap 2221 is provided between the diverter cone 221 and the front cover. The provision of the first thermal insulation gap 2221 can effectively reduce the contact area, thereby playing a role of thermal insulation.

[0043] The material storage chamber 25 is arranged inside the rear section of the sleeve body and is connected with the nozzle 1 through the rear port of the cylinder body 21 .

[0044] As an optional embodiment, the guide sleeve mechanism 22 includes an annular diverter bracket 223, which is arranged in the diverter chamber 24 and close to the side of the barrel 31. The annular diverter bracket 223 is sleeved on the front section of the sleeve body. The annular diverter bracket 223 is shaped like a torpedo body and has multiple diverter ports 2231 evenly arranged along the circumference.

[0045] The annular melt is divided into a number of independent melt flows by the annular flow dividing bracket 223, which can reduce the internal volume of the flow channel, increase the heating area of ​​the plastic melt, and is beneficial to shorten the melt heating time when restarting after shutdown.

[0046] As an optional embodiment, a plurality of sieve holes 2222 are provided on the peripheral wall of the rear section of the sleeve body and communicate with the storage chamber 25. The sieve holes 2222 are arranged in a circular shape, and all the sieve holes 2222 are evenly distributed along the circumference of the rear section of the sleeve body.

[0047] During operation, the material melt flows into the storage chamber 25 through the sieve holes 2222 . When the storage chamber 25 is filled, it flows toward the nozzle 1 under the push of the pressure-maintaining injection mechanism 23 , thereby completing the injection.

[0048] As an optional embodiment, the pressure-maintaining injection mechanism 23 includes a cylinder body 231 , a piston assembly and a plunger 234 , wherein the piston assembly includes a piston body 232 and a piston connecting rod 233 connected to the piston body 232 .

[0049] The cylinder body 231 is axially arranged inside the front section of the sleeve body, the piston body 232 is the piston end of the piston assembly, and its size matches that of the cylinder body 231. The piston body 232 is slidably arranged in the cylinder body 231, and divides the inner cavity of the cylinder body 231 into a first piston cavity 2311 and a second piston cavity 2312. The first piston cavity 2311 and the second piston cavity 2312 are respectively connected with a first oil pipe 2313 and a second oil pipe 2314. The first oil pipe 2313 and the second oil pipe 2314 pass through the cylinder body 231, the sleeve body assembly and the cylinder body 21 in turn and are connected to the hydraulic system to form a hydraulic circuit. The piston connecting rod 233 is the connecting rod end of the piston assembly, which passes through the rear cover and is inserted into the storage cavity 25, and is connected to the plunger 234. The plunger 234 matches the size of the storage cavity 25, and the plunger 234 is slidably arranged in the storage cavity 25.

[0050] During the injection process, the flow of hydraulic oil in the first piston chamber 2311 and the second piston chamber 2312 is controlled by the first oil pipe 2313 and the second oil pipe 2314 to achieve the pushing and retracting of the plunger 234. The pushing pressure of the plunger 234 is the material holding pressure.

[0051] In order to avoid oil leakage, the first oil pipe 2313 and the second oil pipe 2314 are provided with sealing rings to ensure the sealing effect of the oil circuit.

[0052] As an optional embodiment, a second thermal insulation gap 2223 is provided between the outer wall of the cylinder body 231 and the inner wall of the front section of the cylinder body. The second thermal insulation gap 2223 can reduce the contact area between the cylinder body 231 and the front section of the cylinder body, thereby ensuring the thermal insulation effect.

[0053] As an optional embodiment, the pressure-maintaining injection device 2 also includes a cooling mechanism 26, which includes a spiral water jacket 261. The spiral water jacket 261 is arranged in the second insulation gap 2223 and is sleeved on the cylinder body 231. The gap between the outer wall of the spiral water jacket 261 and the cylinder body 231 is greater than 8 mm. The spiral water jacket 261 and the second insulation gap 2223 cooperate with each other, and the cooling and insulation effects are significant.

[0054] The second thermal insulation gap 2223, on the one hand, cooperates with the spiral water jacket 261 to have a significant cooling effect, which can effectively prevent the cylinder body 231 from overheating, protect the oil cylinder, and cool the hydraulic oil at the same time. On the other hand, it can play a role in isolating heat, isolating the spiral water jacket 261 and the diverter chamber 24, thereby ensuring the temperature of the material melt in the diverter chamber 24.

[0055] The spiral water jacket 261 is connected with a first liquid pipe 262 and a second liquid pipe 263 . The first liquid pipe 262 and the second liquid pipe 263 pass through the cylinder body 231 , the jacket assembly and the barrel 21 in sequence and are connected to the liquid cooling system to form a cooling liquid circulation loop.

[0056] In order to avoid leakage of the coolant, the first liquid pipe 262 and the second liquid pipe 263 are provided with sealing rings to ensure the sealing effect of the water channel.

[0057] As an optional embodiment, the pressure-maintaining injection device 2 includes a pressure detection unit 27 . The pressure detection unit 27 uses a pressure sensor. The detection end of the pressure sensor is arranged in the storage chamber 25 for detecting the injection pressure of the material in the storage chamber 25 .

[0058] During the working process, the pressure sensor detects the pressure in real time and transmits the pressure signal to the control device 5. The control device 5 controls the hydraulic system and the screw conveying device according to the pressure information, so as to accurately adjust the material conveying speed, flow rate and pressure, and finally achieve the purpose of reasonable injection molding of the molten material, which can effectively improve the product quality and stabilize the product plasticization quality and process conditions.

[0059] As an optional embodiment, the precise pressure-maintaining controlled expanding extrusion injection molding device includes a supporting device 4, a spiral feeding device and a nozzle 1, the supporting device 4 includes a base assembly, and the nozzle 1, the pressure-maintaining injection device 2, and the spiral clinker device are all arranged on the base assembly.

[0060] The screw conveying device 3 includes a barrel 31, a feed hopper 32 and a screw drive mechanism 33. The feed hopper 32 is arranged on the barrel 31 for feeding; the screw drive mechanism 33 includes a screw drive motor, a frequency converter and a screw. The screw drive motor is connected to the end of the barrel 31 and is electrically connected to the frequency converter. The screw is transmission-connected to the output end of the screw drive motor. The screw is rotatably arranged in the barrel 31. The screw drive motor drives the screw to rotate, thereby conveying the material in the barrel 31; the end of the barrel 31 away from the screw drive motor is connected to the nozzle 1 through the pressure-maintaining injection device 2.

[0061] The screw conveying device can stably convey materials, thereby ensuring smooth injection molding.

[0062] As an optional implementation, the precise pressure-maintaining controlled expanding extrusion injection molding device includes a control device 5 , the control device 5 includes an industrial controller 51 , and the screw feeding device and the pressure-maintaining injection device 2 are both electrically connected to the industrial controller 51 .

[0063] The industrial controller 51 enables the device to realize intelligent control of the injection molding process.

[0064] The working principle and operation process of the precise pressure-holding controlled flaring extrusion injection molding device of the present invention are as follows:

[0065] (1) Initial state

[0066] Before the device is started, all components are in a standby state, the screw drive motor is not started, the piston assembly is in an initial position, and there is no material melt in the storage chamber 25.

[0067] (2) Loading and melting

[0068] Plastic raw materials are added into the barrel 31 through the feed hopper 32, and the screw drive motor is started to drive the screw to rotate, push the raw materials to be transported, and heat and melt. The melt gradually accumulates in the barrel 31, thereby reaching the set pressure.

[0069] (3) Injection stage

[0070] When the melt pressure in the storage chamber 25 reaches a preset value, the pressure sensor transmits a signal to the industrial controller 51, and the industrial controller 51 issues an instruction to drive the spiral drive motor to continue to convey the melt at a certain speed, and supplies oil to the pressure-maintaining injection mechanism 23 through the hydraulic system. The plunger 234 is pushed forward under the action of the hydraulic oil and pushed to the nozzle 1 for injection.

[0071] (4) Pressure holding stage

[0072] When the melt in the mold is filled and reaches the maximum melt pressure value, the pressure sensor sends a signal again. The industrial controller 51 determines that the injection molding is completed based on the signal, and sends a deceleration and zeroing instruction to control the screw drive motor to stop. At the same time, the hydraulic system continues to supply oil to the pressure-maintaining injection mechanism 23 to keep the melt in the mold in a pressure-maintaining state until it cools and solidifies.

[0073] (5) Shutdown and cleanup

[0074] After the injection molding is completed, the device is in a shutdown state. At this time, the material in the storage chamber 25 can be discharged through the drain valve for next use. At the same time, the device is cleaned and maintained as necessary to ensure the smooth progress of the next injection molding process.

[0075] The present invention aims to comprehensively improve product quality and production efficiency by accurately controlling the pressure holding process and optimizing the production process.

[0076] By adding a pressure-maintaining injection device 2 between the nozzle 1 and the barrel 31, a more accurate and stable constant pressure plastic replenishment can be provided during the injection molding to pressure-maintaining process, thereby effectively solving problems such as mold expansion and flash, and significantly improving the internal quality and mechanical properties of the product.

[0077] In addition, the present invention also fully considers the problem of energy consumption during the design process. Through intelligent control, the motor power in the pressure holding stage is only one-third of the original power, thereby significantly reducing energy consumption.

[0078] At the same time, the present invention has extremely high flexibility and can meet the expansion requirements of pipes with different specifications from DN200 to DN2000, greatly improving the production efficiency and adaptability of the production line.

[0079] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple" or "several" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A precise pressure-holding controlled flaring extrusion injection molding device, characterized in that: It includes a pressure-maintaining injection device arranged between the nozzle and the barrel, and the pressure-maintaining injection device includes a barrel, a guide sleeve mechanism and a pressure-maintaining injection mechanism, wherein: The feed end and the discharge end of the barrel are connected to the barrel and the nozzle respectively; The guide sleeve mechanism is axially arranged inside the cylinder and encloses a flow dividing cavity with the inner wall of the cylinder. A material storage cavity is arranged inside the guide sleeve mechanism and communicates with the flow dividing cavity. The material storage cavity is communicated with the nozzle. The pressure-maintaining injection mechanism is arranged in the guide sleeve mechanism, and the injection end of the pressure-maintaining injection mechanism is arranged in the material storage cavity, and can push the material in the material storage cavity to the nozzle.

2. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 1, characterized in that: The guide sleeve mechanism comprises a flow diverter cone and a sleeve body assembly, wherein: The splitter cone is arranged outside the sleeve assembly and close to one end of the barrel, and a first heat insulation gap is arranged between the splitter cone and the sleeve assembly; The material storage chamber is arranged inside the sleeve assembly and close to one end of the nozzle.

3. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 2, characterized in that: The guide sleeve mechanism comprises an annular flow diversion bracket, wherein: The annular flow diversion bracket is arranged in the flow diversion cavity and close to one side of the barrel. The annular flow diversion bracket is sleeved on the sleeve assembly. The annular flow diversion bracket is evenly provided with a plurality of flow diversion ports along the circumferential direction.

4. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 2, characterized in that: A plurality of sieve holes are arranged on the peripheral wall of the sleeve assembly and communicate with the material storage cavity; All the sieve holes are evenly distributed along the circumference.

5. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 1, characterized in that: The pressure-maintaining injection mechanism comprises a cylinder, a piston assembly and a plunger, wherein: The cylinder body is arranged inside the guide sleeve mechanism; The piston end of the piston assembly is inserted into the cylinder body and slidably cooperates with the cylinder body. The piston end of the piston assembly divides the cylinder body into a first piston chamber and a second piston chamber. The first piston chamber and the second piston chamber are respectively connected with a first oil pipe and a second oil pipe. The connecting rod end of the piston assembly is inserted into the material storage chamber and connected to the plunger. The plunger is slidably matched with the material storage cavity.

6. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 5, characterized in that: A second heat-insulating gap is provided between the outer wall of the cylinder body and the inner wall of the flow guide sleeve mechanism.

7. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 6, characterized in that: The pressure-maintaining injection device further comprises a cooling mechanism, wherein the cooling mechanism comprises a spiral water jacket, wherein: The spiral water jacket is arranged in the second heat insulation gap and is sleeved on the cylinder body; The spiral water jacket is connected with a first liquid pipe and a second liquid pipe.

8. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 1, characterized in that: The pressure-maintaining injection device comprises a pressure detection unit, wherein: The detection end of the pressure detection unit is arranged in the material storage cavity, and is used for detecting the injection pressure of the material in the material storage cavity.

9. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 1, characterized in that: The precise pressure-maintaining controlled flaring extrusion injection molding device comprises a supporting device, a spiral feeding device and a nozzle, wherein: The screw conveying device includes a barrel, a feed hopper and a screw driving mechanism. The feed hopper is arranged on the barrel and is used for feeding. The screw driving mechanism is connected to the barrel and is used for conveying the material in the barrel. The barrel is connected to the nozzle through the pressure-maintaining injection device.

10. The precise pressure-holding controlled flaring extrusion injection molding device according to claim 9, characterized in that: The precise pressure-maintaining controlled flaring extrusion injection molding device comprises a control device, and the screw feeding device and the pressure-maintaining injection device are both electrically connected to the control device.

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