Injection molding machine barrel temperature uniformity control device

Abstract

This utility model relates to the field of plastic product manufacturing technology, specifically disclosing a uniform temperature control device for injection molding machine barrels. The device includes a barrel body, which holds the injection molding material. A surrounding electromagnetic induction heating element is fitted around the barrel body, serving as the main heating component. This element heats the barrel body itself through electromagnetic induction. In this uniform temperature control device, the surrounding electromagnetic induction heating element heats the barrel body itself via electromagnetic induction, allowing heat to be evenly transferred from the outer wall to the interior. This avoids the independent control differences inherent in traditional segmented heating. Simultaneously, a drive motor rotates the stirring rod, main stirring blade, and auxiliary stirring blade. The main stirring blade agitates the material in the upper and middle sections, while the auxiliary stirring blade adapts to the conical structure at the bottom of the barrel, enhancing axial material mixing and eliminating temperature gradients along the barrel's length, resulting in more uniform heating and plasticization of the material in all axial regions.

Description

Technical Field

[0001] This utility model relates to the field of plastic product manufacturing technology, specifically to a device for uniform temperature control of injection molding machine barrels. Background Technology

[0002] As the core equipment in the production of plastic products, the temperature control of the injection molding machine barrel directly affects the molding quality of the product. Existing injection molding machine barrels usually use segmented electric heating rods combined with thermocouple temperature sensors for closed-loop control. The heating power is adjusted by PID algorithm to maintain the set temperature. This temperature control method is based on the melting rheological characteristics of the material, ensuring that the plastic particles undergo solid softening, melting plasticization and uniform mixing processes in the barrel, thereby obtaining a melt with good fluidity for injection molding.

[0003] In actual production applications, due to the long axial length of the barrel and the independent control of each heating section, a temperature gradient along the length of the barrel is likely to occur, resulting in uneven plasticization of the material. In addition, the melt flow state inside the barrel is complex, and the radial temperature difference causes the material near the barrel wall to decompose or carbonize due to excessive heating, while the material in the central area may not be fully plasticized. Utility Model Content

[0004] The purpose of this invention is to provide a uniform temperature control device for injection molding machine barrels, in order to solve the problems mentioned in the background art, which are that due to the long axial length of the barrel and the independent control of each heating section, temperature gradients are easily generated along the length of the barrel, resulting in uneven plasticization of the material. Furthermore, the complex melt flow state inside the barrel and the radial temperature difference cause the material near the barrel wall to decompose or carbonize due to excessive heating, while the material in the central area may not be sufficiently plasticized.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a uniform temperature control device for injection molding machine barrel, including a barrel body, which is a barrel body for holding injection molding materials. The barrel body is surrounded by a circumferential electromagnetic induction heating element, which is the main heating component. It heats up the barrel body itself through the principle of electromagnetic induction, so as to achieve uniform heat transfer from the outer wall of the barrel body to the inside.

[0006] An auxiliary support is provided at the bottom of the outer side of the material cylinder body, and the upper end of the auxiliary support has a groove that engages with the bottom end of the surrounding electromagnetic induction heating element. A limiting frame is engaged at the opening at the upper end of the material cylinder body, and an auxiliary bearing is installed at the center of the limiting frame.

[0007] The auxiliary bearing is rotatably connected to the top of the stirring rod, and the top of the stirring rod is connected to the output end of the drive motor. The outer frame of the drive motor is connected to the limiting frame. The stirring rod is fitted with a main stirring blade, and the bottom end of the main stirring blade abuts against the upper end of the auxiliary stirring blade. The auxiliary stirring blade is fitted outside the guide screw body, and the bottom end of the guide screw is spiral-shaped. The guide screw and the stirring rod are axially threaded.

[0008] By adopting the above technical solution, the entire cylinder is heated by a surrounding electromagnetic induction heating element, thus achieving uniform axial heat conduction.

[0009] Preferably, the bottom end of the material cylinder is provided with a conical structure, and the interior of the conical structure of the material cylinder matches the shape of the auxiliary stirring blade.

[0010] By adopting the above technical solution, the conical structure at the bottom of the material cylinder is matched with the shape of the auxiliary stirring blades, effectively eliminating the dead corner of material accumulation at the bottom of the material cylinder.

[0011] Preferably, the limiting frame has four symmetrically arranged fan-shaped openings inside, and each support of the limiting frame has an infrared radiation heating tube embedded at its bottom.

[0012] By adopting the above technical solution, the fan-shaped opening of the limiting frame reduces the obstruction to material flow and ensures smooth material circulation during the mixing process.

[0013] Preferably, a limiting ring is engaged with the upper end of the main stirring blade, and the bottom end of the limiting ring abuts against the top end of the scraper, and rectangular openings are equidistantly provided inside the main stirring blade.

[0014] Using the above technical solution, the limiting ring fixes the main stirring blade to ensure stirring stability, and the scraper closely adheres to the cylinder wall to scrape off the accumulated material, preventing the material from decomposing and carbonizing due to prolonged contact with the high-temperature cylinder wall.

[0015] Preferably, the bottom end of the scraper is mounted on the surface of the auxiliary stirring blade, and the scraper surface abuts against the inner wall of the material cylinder.

[0016] Using the above technical solution, the scraper and auxiliary stirring blades work together to continuously clean the material on the cylinder wall during the stirring process, so that the material near the cylinder wall is always in a flowing and mixed state, avoiding local overheating.

[0017] Preferably, the auxiliary stirring blade is located below the stirring rod, and the bottom end of the auxiliary stirring blade abuts against the upper end of the spiral plate of the guide screw.

[0018] By adopting the above technical solution, the auxiliary stirring blades and the guide screw spiral plate cooperate to smoothly push the uniformly plasticized material to the discharge port while stirring the material.

[0019] Preferably, the infrared radiation heating tube faces the material inside the cylinder, and the cable of the infrared radiation heating tube passes through the side wall of the limiting frame.

[0020] Using the above technical solution, the infrared radiation heating tube directly heats the inside of the material, realizing the self-heating of the material's interior and making up for the deficiency of external heating in that it is difficult to quickly and evenly heat the center of the material.

[0021] Compared with the prior art, the beneficial effects of this utility model are: the injection molding machine barrel temperature uniform control device:

[0022] 1. A surround electromagnetic induction heating element is fitted around the barrel body. The barrel body heats up by electromagnetic induction. The heat is evenly transferred from the outer wall to the inside, avoiding the independent control differences of traditional segmented heating. At the same time, the drive motor drives the stirring rod, main stirring blade and auxiliary stirring blade to rotate. The main stirring blade stirs the material in the middle and upper part, and the auxiliary stirring blade is adapted to the conical structure at the bottom of the barrel to enhance the axial mixing of materials, eliminate the temperature gradient along the length of the barrel, and make the material more evenly heated and plasticized in all axial areas.

[0023] 2. The infrared radiation heating tube embedded at the bottom of the limit frame bracket emits infrared rays toward the material inside the cylinder, directly penetrating the material to supplement radial heat. Together with the scraper rotating with the agitator, it scrapes away the material accumulated on the cylinder wall, preventing the material on the cylinder wall from decomposing and carbonizing due to prolonged heating. The agitation of the main agitator blade and the infrared radiation heating ensure that the material in the central area is fully heated, greatly reducing the radial temperature difference and solving the problem of uneven heating and different plasticization states of the material near the cylinder wall and the central area.

[0024] 3. The guide screw and the stirring rod are axially threaded together. When rotating, the bottom of the screw pushes the material towards the outlet. The auxiliary stirring blades work together to organize the flow path. The stirring of the main stirring blade and the auxiliary stirring blade makes the material more uniformly plasticized. The material is evenly discharged through the guide screw, avoiding temperature fluctuations caused by uneven discharge flow rate. This provides a stable melt for injection molding and improves the dimensional accuracy, surface quality and mechanical properties of the product. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall internal side section of the present invention.

[0027] Figure 3 This is a three-dimensional structural diagram of the installation of the main stirring blade, auxiliary stirring blade, and guide screw of this utility model.

[0028] Figure 4 This is a three-dimensional structural diagram of the main stirring blade and the guide screw of this utility model.

[0029] Figure 5This is a side-sectional three-dimensional structural diagram of the surround electromagnetic induction heating element of this utility model;

[0030] Figure 6 This is a three-dimensional structural diagram of the installation of the limiting frame and the infrared radiation heating tube of this utility model.

[0031] In the diagram: 1. Material cylinder body; 2. Surround electromagnetic induction heating element; 3. Auxiliary support; 4. Limiting frame; 5. Auxiliary bearing; 6. Drive motor; 7. Stirring rod; 8. Main stirring blade; 9. Limiting ring; 10. Scraper; 11. Auxiliary stirring blade; 12. Guide screw; 13. Infrared radiation heating tube. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figures 1-6 This utility model provides a technical solution: a uniform temperature control device for injection molding machine barrel, including a barrel body 1, a surrounding electromagnetic induction heating element 2, an auxiliary support 3, a limiting frame 4, an auxiliary bearing 5, a drive motor 6, a stirring rod 7, a main stirring blade 8, a limiting ring 9, a scraper 10, an auxiliary stirring blade 11, a guide screw 12, and an infrared radiation heating tube 13.

[0034] Among them, the barrel body 1 is a barrel for holding injection molding materials. The barrel body 1 is surrounded by a surrounding electromagnetic induction heating element 2, which is the main heating component. It heats up the barrel body 1 itself through the principle of electromagnetic induction, so that heat is evenly transferred from the outer wall of the barrel body 1 to the inside.

[0035] An auxiliary support 3 is provided at the bottom of the outer side of the cylinder body 1, and the upper end of the auxiliary support 3 has a groove that engages with the bottom end of the surrounding electromagnetic induction heating element 2. A limiting frame 4 is engaged at the opening at the upper end of the cylinder body 1, and an auxiliary bearing 5 is installed at the center of the limiting frame 4. The bottom end of the cylinder body 1 is set as a conical structure, and the inside of the conical structure of the cylinder body 1 matches the shape of the auxiliary stirring blade 11. Four fan-shaped openings are symmetrically opened inside the limiting frame 4, and an infrared radiation heating tube 13 is embedded at the bottom end of each support of the limiting frame 4. The infrared radiation heating tube 13 faces the material inside the cylinder body 1, and the cable of the infrared radiation heating tube 13 passes through the side wall of the limiting frame 4.

[0036] Referring to the attached diagrams in the instruction manual Figures 1-6As shown, place the auxiliary support 3 on the corresponding installation plane of the injection molding machine and fix it with bolts. The groove at the upper end of the auxiliary support 3 must be kept horizontal so that it can be engaged with the surrounding electromagnetic induction heating element 2 later. Tightly wrap the surrounding electromagnetic induction heating element 2 around and fit it on the outside of the barrel body 1 to ensure that the surrounding electromagnetic induction heating element 2 is completely attached to the outer wall of the barrel body 1 to improve heating efficiency. Then slowly put the barrel body 1 with the heating element fitted into the auxiliary support 3 so that the bottom end of the surrounding electromagnetic induction heating element 2 is precisely engaged with the groove of the auxiliary support 3 to complete the initial fixation.

[0037] At the opening at the upper end of the material cylinder body 1, the limiting frame 4 is snapped together with a buckle to ensure that the limiting frame 4 is installed firmly and its center is aligned with the axis of the material cylinder body 1. The auxiliary bearing 5 is installed in the preset mounting hole in the center of the limiting frame 4 and an appropriate amount of lubricant is applied to reduce bearing rotation friction. The top end of the stirring rod 7 is passed through the auxiliary bearing 5 to achieve a rotatable connection between the stirring rod 7 and the auxiliary bearing 5. The outer frame of the drive motor 6 is connected to the limiting frame 4 and fixed with bolts to ensure that the drive motor 6 is stable. Then, the output end of the drive motor 6 is precisely connected to the top end of the stirring rod 7 and locked to ensure stable power transmission.

[0038] The main stirring blade 8 and the auxiliary stirring blade 11 are sequentially fitted onto the outside of the stirring rod 7, so that they are tightly abutted against the auxiliary stirring blade 11. The guide screw 12 is screwed into the bottom end of the stirring rod 7 through an axial thread. The infrared radiation heating tube 13 is embedded in the installation groove pre-opened at the bottom end of each bracket of the limiting frame 4, so that the infrared radiation heating tube 13 faces the material inside the barrel 1. The cable of the infrared radiation heating tube 13 is led out along the pre-set wire hole on the side wall of the limiting frame 4. The cable is fixed and insulated. The limiting ring 9 is snapped onto the upper end of the main stirring blade 8, ensuring that the limiting ring 9 is tightly fitted with the main stirring blade 8. One end of the scraper 10 is installed on the blade surface of the auxiliary stirring blade 11, and the other end is adjusted to abut against the inner wall of the barrel 1, so that the scraper 10 can effectively scrape off the material on the barrel wall during the stirring process.

[0039] The auxiliary bearing 5 is rotatably connected to the top of the stirring rod 7, and the top of the stirring rod 7 is connected to the output end of the drive motor 6. The outer frame of the drive motor 6 is connected to the limiting frame 4. The stirring rod 7 is fitted with a main stirring blade 8, and the bottom end of the main stirring blade 8 abuts against the upper end of the auxiliary stirring blade 11. The auxiliary stirring blade 11 is fitted outside the body of the guide screw 12, and the bottom end of the guide screw 12 is spiral. The guide screw 12 and the stirring rod 7 are axially threaded. The upper end of the main stirring blade 8 is engaged with a limiting ring 9, and the bottom end of the limiting ring 9 abuts against the top of the scraper 10. The main stirring blade 8 has rectangular openings at equal intervals. The bottom end of the scraper 10 is installed on the blade surface of the auxiliary stirring blade 11, and the surface of the scraper 10 abuts against the inner wall of the material cylinder 1. The auxiliary stirring blade 11 is below the stirring rod 7, and the bottom end of the auxiliary stirring blade 11 abuts against the upper end of the spiral plate of the guide screw 12.

[0040] Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, when the power supply of the device is turned on, the surrounding electromagnetic induction heating element 2 is started. It uses the principle of electromagnetic induction to make the cylinder 1 heat up itself. The heat is evenly transferred from the outer wall to the inside, and the material inside the cylinder 1 is preheated evenly in the axial direction. At the same time, the infrared radiation heating tube 13 starts to work and emits infrared rays into the material inside the cylinder 1. The infrared rays penetrate the material and supplement the radial heat. In conjunction with the electromagnetic induction heating, the temperature difference between the axial and radial directions of the material is quickly reduced, and the overall temperature of the material quickly becomes uniform.

[0041] Start the drive motor 6. The drive motor 6 drives the stirring rod 7 to rotate through the auxiliary bearing 5. The main stirring blade 8 and the auxiliary stirring blade 11 rotate synchronously. The main stirring blade 8 stirs the material in the upper part of the barrel, promoting the mixing and heat transfer of the material in the upper part. The auxiliary stirring blade 11 is adapted to the conical structure at the bottom of the barrel, effectively stirring the material in the corner of the bottom of the barrel, avoiding the accumulation of material to form a temperature dead zone, strengthening the mixing of the bottom material, breaking the local temperature stratification of the material in the barrel, and making the material more evenly heated during the stirring process. As the stirring rod 7 rotates, one end of the scraper 10 is connected to the auxiliary stirring blade 11, and the other end is attached to the inner wall of the barrel 1 and rotates synchronously, continuously scraping off the material attached to the barrel wall, avoiding the accumulation of material from being in contact with the high temperature barrel wall for a long time, causing local overheating or carbonization, ensuring the temperature near the barrel wall is stable, and ensuring that the material near the barrel wall and the material in other areas inside the barrel are heated evenly.

[0042] After the material is plasticized, the guide screw 12 rotates with the stirring rod 7, and its spiral bottom pushes the material towards the discharge port. During this process, the auxiliary stirring blade 11 cooperates with the spiral plate of the guide screw 12 to further streamline the material flow path, ensuring that the plasticized material is uniformly discharged from the barrel at a stable flow rate and uniform temperature. After the production task is completed, the surrounding electromagnetic induction heating element 2 and the infrared radiation heating tube 13 are turned off to stop heating. After the temperature of the barrel body 1 drops to a safe range, the drive motor 6 is turned off.

[0043] Working principle: When using the injection molding machine barrel temperature uniform control device, the surrounding electromagnetic induction heating element 2 is sleeved on the outside of the barrel body 1. After being powered on, the barrel body 1 heats up by using the principle of electromagnetic induction. The heat is transferred from the outer wall to the inside, providing basic heating for the material and achieving axial preliminary uniform preheating. The infrared radiation heating tube 13 embedded at the bottom of the limit frame 4 emits infrared rays toward the material inside the barrel body 1. The infrared rays directly penetrate the material, supplementing radial heat, which works in conjunction with the electromagnetic induction heating.

[0044] The drive motor 6 drives the stirring rod 7 to rotate through the auxiliary bearing 5. The main stirring blade 8 and the auxiliary stirring blade 11 rotate synchronously. The main stirring blade 8 stirs the material in the upper part of the material cylinder. The auxiliary stirring blade 11 is adapted to the conical structure at the bottom of the material cylinder to enhance the mixing of the bottom material and break up local temperature stratification. One end of the scraper 10 is connected to the auxiliary stirring blade 11 and the other end is attached to the inner wall of the material cylinder 1. When it rotates with the stirring rod 7, it scrapes off the material attached to the cylinder wall to avoid the accumulation of material from local overheating or carbonization due to prolonged heating, and to ensure the temperature near the cylinder wall is stable.

[0045] The guide screw 12 is axially threaded to the stirring rod 7. When the stirring rod 7 rotates, its spiral bottom pushes the material towards the discharge port. At the same time, the auxiliary stirring blade 11 cooperates with the spiral plate of the guide screw 12 to further streamline the material flow path, ensuring that the plasticized material is discharged evenly and avoiding temperature fluctuations caused by uneven flow rate during discharge, thus increasing the overall practicality.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for uniformly controlling the temperature of the injection molding machine barrel, including: The barrel body (1) is a barrel for holding injection molding materials. The barrel body (1) is surrounded by a surrounding electromagnetic induction heating element (2), which is the main heating component. It heats up the barrel body (1) itself through the principle of electromagnetic induction, so that heat is evenly transferred from the outer wall of the barrel body (1) to the inside. The feature is that: an auxiliary support (3) is provided at the bottom of the outer side of the material cylinder body (1), and the upper end of the auxiliary support (3) has a groove that engages with the bottom end of the surrounding electromagnetic induction heating element (2). A limiting frame (4) is engaged and connected at the opening of the upper end of the material cylinder body (1), and an auxiliary bearing (5) is installed at the center of the limiting frame (4). The auxiliary bearing (5) is rotatably connected to the top of the stirring rod (7), and the top of the stirring rod (7) is connected to the output end of the drive motor (6). The outer frame of the drive motor (6) is connected to the limiting frame (4). The stirring rod (7) is fitted with a main stirring blade (8), and the bottom end of the main stirring blade (8) abuts against the upper end of the auxiliary stirring blade (11). The auxiliary stirring blade (11) is fitted outside the body of the guide screw (12), and the bottom end of the guide screw (12) is spiral. The guide screw (12) and the stirring rod (7) are axially threaded.

2. The injection molding machine barrel temperature uniform control device according to claim 1, characterized in that: The bottom end of the material cylinder (1) is set as a conical structure, and the inside of the conical structure of the material cylinder (1) matches the shape of the auxiliary stirring blade (11).

3. The injection molding machine barrel temperature uniform control device according to claim 1, characterized in that: The limiting frame (4) has four symmetrically arranged fan-shaped openings inside, and each support of the limiting frame (4) has an infrared radiation heating tube (13) embedded at the bottom.

4. The injection molding machine barrel temperature uniform control device according to claim 1, characterized in that: The upper end of the main stirring blade (8) is engaged with a limiting ring (9), and the bottom end of the limiting ring (9) abuts against the top end of the scraper (10). Rectangular openings are equidistantly provided inside the main stirring blade (8).

5. The injection molding machine barrel temperature uniform control device according to claim 4, characterized in that: The bottom end of the scraper (10) is installed on the surface of the auxiliary stirring blade (11), and the surface of the scraper (10) abuts against the inner wall of the material cylinder (1).

6. The injection molding machine barrel temperature uniform control device according to claim 1, characterized in that: The auxiliary stirring blade (11) is located below the stirring rod (7), and the bottom end of the auxiliary stirring blade (11) abuts against the upper end of the spiral plate of the guide screw (12).

7. The injection molding machine barrel temperature uniform control device according to claim 3, characterized in that: The infrared radiation heating tube (13) faces the material inside the cylinder body (1), and the cable of the infrared radiation heating tube (13) passes through the side wall of the limiting frame (4).

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