A wavy double-threaded barrier pin screw

Abstract

This invention discloses a corrugated double-threaded barrier pin screw, comprising a feeding section, a melting section, and a homogenizing section. The melting section includes a main thread, a secondary thread, a melting groove, and a solidification groove. The main thread extends from the feeding thread of the feeding section to the end of the homogenizing section, with an increased lead at the end of the feeding thread, making the pitch of the main thread greater than that of the feeding thread. The secondary thread is newly formed from the advancing surface at the end of the feeding thread and extends to the end of the homogenizing section, merging with the main thread. The secondary thread divides the feeding thread groove of the feeding section into a melting groove and a solidification groove in the melting section. The thread height and thread width of the secondary thread are both lower than those of the main thread. The depth of the melting groove gradually increases from shallow to deep in the melting section and then decreases from deep to shallow in the homogenizing section, thereby significantly improving the mixing and homogenization effect of the molten plastic, increasing the melting efficiency of the plastic, and achieving high speed, high quality, and high output of the product. It also significantly improves the screw's conveying efficiency and solid-liquid separation efficiency, and extends the screw's lifespan.

Description

Technical Field

[0001] This invention relates to the field of plastic product molding equipment, specifically to a corrugated double-threaded barrier pin screw. Background Technology

[0002] Injection molding is the primary molding method for plastic products, and the injection screw is one of the most critical components of an injection molding machine. It rotates inside the machine barrel, heating and plasticizing solid plastic into a molten state. The rotation propels this molten plastic forward, resulting in a molten plastic with uniform density, viscosity, and composition. This molten plastic is then injected into the mold cavity under pressure. After cooling and solidification, a plastic product with the same shape as the mold cavity is obtained. The quality of the injection screw design directly affects the quality and output of plastic products and plays a decisive role in the performance of the injection molding machine.

[0003] However, existing injection screws still have certain shortcomings in their structural design. When the length-to-diameter ratio is short, the mixing and homogenization effects of the screw are poor, making it impossible to achieve high speed and high output of high-quality plasticized products under zero back pressure. Therefore, there is an urgent need for an injection screw that can solve the above problems. Summary of the Invention

[0004] To overcome the shortcomings mentioned above, the present invention aims to provide a technical solution that can solve the above problems.

[0005] A corrugated double-threaded barrier pin screw includes a feeding section, a melting section, and a homogenizing section. The melting section includes a main thread, a secondary thread, a melting groove, and a solid groove.

[0006] The main thread is formed by extending the feeding thread of the feeding section and extends to the end of the homogenization section, and the lead of the feeding thread at the end of the feeding section is increased, so that the pitch of the main thread is greater than the pitch of the feeding thread.

[0007] The auxiliary thread is newly formed by the pushing surface at the end of the feeding thread and extends to the end of the homogenization section to merge with the main thread. The auxiliary thread divides the feeding thread groove of the feeding section into the molten groove and the solid groove in the melting section. The thread height and thread width of the auxiliary thread are both lower than those of the main thread.

[0008] The depth of the melting tank gradually increases from shallow to deep in the melting section and decreases from deep to shallow in the homogenization section.

[0009] Preferably, the pitch of the main thread is 1.25 times the pitch of the feeding thread, and the width of the solid groove is smaller than the width of the feeding thread groove of the feeding section.

[0010] Preferably, the pitch of the auxiliary thread in the molten section is the same as the pitch of the main thread in the molten section; the pitch of the auxiliary thread gradually increases in the homogenization section, and the auxiliary thread merges with the main thread at the end of the homogenization section.

[0011] Preferably, the depth of the solid tank gradually decreases from deep to shallow in the melting section.

[0012] Preferably, the width of the secondary thread is 0.5 to 0.7 times the width of the primary thread; the difference in thread height between the primary thread and the secondary thread is 0.1 to 0.15 times the width of the primary thread.

[0013] Preferably, the depth of the feeding thread groove is 2.3 to 2.5 times the depth of the groove after the main thread and auxiliary thread at the end of the homogenization section are combined.

[0014] Preferably, the homogenization section has an integrally formed mixing section and a pin section on the side away from the melting section; the mixing section includes a barrier head, and the barrier head is provided with an inclined feed chute and a discharge chute; the pin section is provided with a plurality of staggered pins.

[0015] Preferably, the feed trough and the discharge trough are separated by a barrier ridge, and there is a barrier gap between the barrier ridge and the barrel.

[0016] Preferably, the feed chute is milled through on one side near the homogenization section, and the discharge chute is milled through on the other side near the pin section.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. In a corrugated double-threaded barrier pin screw of the present invention, the main thread and the auxiliary thread allow for better separation of the solid and liquid phases of the plastic. The pitch of the main thread in the melting section is greater than the pitch of the feeding thread in the feeding section, which can improve the screw's conveying efficiency and production capacity, and reduce energy consumption.

[0019] 2. In a corrugated double-threaded barrier pin screw of the present invention, the melting section, the mixing section and the pin section can improve the plasticizing effect of the raw materials, making the components in the molten plastic more uniform, with fewer solid particles, and resulting in higher quality of the molded products.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a partial structural schematic diagram of the present invention.

[0024] Figure 3 This is the present invention. Figure 2 A schematic diagram of a partial cross-section at EE.

[0025] Figure 4 This is a schematic diagram showing the variation of the auxiliary thread bottom diameter (also representing the depth of the melting groove) in this invention.

[0026] Figure 5 This is a schematic diagram showing the variation of the main thread bottom diameter (also representing the solid groove depth) in this invention.

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the barrier head in the mixing section of this invention.

[0028] In the diagram: 1. Screw;

[0029] 2. Feeding section; 21. Feeding thread; 22. Feeding thread groove;

[0030] 3. Melting section; 31. Solidification tank; 32. Main thread; 33. Secondary thread; 34. Melting tank;

[0031] 4. Homogenization section;

[0032] 5. Mixing section; 51. Feed chute; 52. Discharge chute; 53. Barrier gap;

[0033] 6. Pin section; 7. Root diameter of auxiliary thread; 8. Outer diameter of main thread; 81. Root diameter of main thread. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Please see Figures 1-6 In this embodiment of the invention, a corrugated double-threaded barrier pin screw includes a feeding section 2, a melting section 3 and a homogenizing section 4. The melting section 3 includes a main thread 32, a secondary thread 33, a melting groove 34 and a solid groove 31.

[0039] The main thread 32 is extended from the feeding thread 21 of the feeding section 2 and extends to the end of the homogenization section 4. The lead of the feeding thread 21 at the end of the feeding section 2 is increased, so that the pitch of the main thread 32 is greater than the pitch of the feeding thread 21.

[0040] The auxiliary thread 33 is newly generated from the pushing surface at the end of the feeding thread 21 and extends to the end of the homogenization section 4 to merge with the main thread 32. The auxiliary thread 33 divides the feeding thread groove 22 of the feeding section 2 into the melting section 3 into the melting groove 34 and the solid groove 31. The thread height and thread width of the auxiliary thread 33 are both lower than those of the main thread 32.

[0041] The depth of the melting tank 34 gradually increases from shallow to deep in the melting section 3 and decreases from deep to shallow in the homogenization section 4.

[0042] It should be noted that the feeding section 2 can heat and melt the plastic raw material and push the raw material to the melting section 3 through the feeding thread 21 and the feeding thread groove 22; while the main thread 32 of the melting section 3 is formed by the lead of the feeding thread 21 gradually increasing. The pitch of the main thread 32 is greater than that of the feeding thread, which can improve the conveying efficiency of the screw 1, enable more plastic raw material to be conveyed, increase production capacity and reduce energy consumption.

[0043] It should also be noted that, as the feed thread 21 changes its lead upon entering the melting section 3 to form the main thread 32, the width of the feed thread groove 22 also increases accordingly. The auxiliary thread 33 then separates the original feed thread groove 22 within the melting section 3, forming a melting tank 34 for accommodating molten plastic and a solid tank 31 for accommodating solid plastic particles. Because the thread height of the auxiliary thread 33 is lower than that of the cylindrical thread, in actual use, the molten plastic material continuously flows from the solid tank 31 into the melting tank 34 through the gap between the auxiliary thread 33 and the barrel, achieving rapid and continuous separation of the solid and liquid phases of the plastic material.

[0044] It should also be noted that the depth of the molten pool 34 gradually increases from shallow to deep in the molten section 3 (that is, Figure 4 The gradual inclination of the threaded bottom diameter 7 towards the lower left side gradually increases the carrying capacity of the molten plastic in the melting tank 34, accelerates the separation speed and effect of the solid and liquid phases of the plastic raw material, further improves the melting speed and effect of the plastic raw material and the homogenization effect of the plastic raw material components, and improves the quality of the final product. Meanwhile, the shallowing of the melting tank 34 in the homogenization section 4 allows the molten plastic to be extruded from the melting tank 34 into the mixing section 5 more quickly, increasing the discharge speed of the molten plastic and further improving production capacity.

[0045] The pitch of the main thread 32 is 1.25 times the pitch of the feed thread 21, and the width of the solid groove 31 is smaller than the width of the feed thread groove 22 of the feed section 2.

[0046] It should be noted that during the plastic transport process of screw 1, the pitch of the main thread 32 is 1.25 times that of the feed thread 21, which can carry more plastic and reduce the pressure on screw 1. However, the width of the solid groove 31 is smaller than that of the feed thread 21, which reduces the carrying capacity of the solid groove 31 for solid plastic, while increasing the carrying capacity of the molten groove 34 for molten plastic. This achieves the goal of increasing the overall carrying capacity of screw 1 while also increasing the shear stress and pressure between solid plastics in the solid groove 31, thereby improving the melting speed and melting efficiency of solid plastics.

[0047] The pitch of the auxiliary thread 33 in the melting section 3 is the same as that of the main thread 32 in the melting section 3; the pitch of the auxiliary thread 33 gradually increases in the homogenization section 4, and the auxiliary thread 33 merges with the main thread 32 at the end of the homogenization section 4.

[0048] It should be noted that the auxiliary thread 33 is parallel to the main thread 32 in the melting section 3, with the same pitch. This effectively separates the solid plastic and the molten plastic, ensuring stable and rapid transport of both. It also ensures that the molten plastic in the solid tank 31 can flow continuously and stably into the melting tank 34. In the homogenization section 4, the pitch of the auxiliary thread 33 begins to increase and merges with the main thread 32 at the end of the homogenization section 4. This gradually widens the melting tank 34 and reduces the width of the solid tank 31, squeezing the molten plastic in the solid tank 31 and any unmelted granular plastic particles into the melting tank 34. This further improves the melting effect of the solid plastic in the homogenization section 4 and the flow efficiency of the molten plastic into the melting tank 34.

[0049] The depth of the solid tank 31 gradually decreases from deep to shallow in the melting section 3.

[0050] It should be noted that the solidification tank 31 gradually becomes shallower in both the melting section 3 and the homogenization section 4 (that is, in... Figure 5 The bottom diameter 81 of the main thread gradually tilts to the lower left relative to the constant outer diameter 8 of the main thread. In the melting section 3, the carrying capacity of the solid tank 31 can be gradually reduced, and the upper layer of molten plastic can be continuously and stably transferred to the melting tank 34, maintaining the continuous and stable separation of solid and liquid. In the homogenization section 4, the depth of the solid tank 31 decreases continuously while the width of the tank also decreases rapidly, further accelerating the flow of molten plastic to the melting tank 34 and further improving the melting efficiency of plastic.

[0051] The width of the thread ridge of the auxiliary thread 33 is 0.5 to 0.7 times the width of the thread ridge of the main thread 32; the difference in thread ridge height between the main thread 32 and the auxiliary thread 33 is 0.1 to 0.15 times the width of the thread ridge of the main thread 32.

[0052] It should be noted that the height difference between the main thread 32 and the auxiliary thread 33 allows the molten plastic in the solid tank 31 to flow more smoothly into the melting tank 34, making the solid-liquid separation of the plastic more stable and efficient. The width of the auxiliary thread 33, which is 0.5 to 0.7 times the width of the main thread 32, allows for better heat exchange, transferring heat from the melting tank 34 to the solid tank 31, thus accelerating the melting efficiency of the solid plastic in the solid tank 31. Furthermore, because there are no fragments from solid breakage clogging the screw gap, preventing poor lubrication and pressure fluctuations between the screw 1 and the inner wall of the barrel, the screw 1 experiences more uniform stress, resulting in more stable operation and a longer service life.

[0053] The groove depth of the feeding thread groove 22 is 2.3 to 2.5 times the groove depth of the main thread 32 and auxiliary thread 33 at the end of the homogenization section 4 after they are combined.

[0054] It should be noted that the depth of the feeding thread groove 22 can improve the carrying capacity of the screw 1 for plastic, while the depth of the groove at the end of the homogenization section 4 can allow the molten plastic to be better extruded into the next section of the screw 1.

[0055] The homogenization section 4 is integrally formed with a mixing section 5 and a pin section 6 on the side away from the melting section 3; the mixing section 5 includes a barrier head, on which an inclined feed chute 51 and a discharge chute 52 are provided; the pin section 6 is provided with a plurality of staggered pins.

[0056] It should be noted that in the homogenization section 4, the molten plastic enters the barrier head of the mixing section 5 through the feed chute 51 and then enters the pin section 6 through the discharge chute 52. In some embodiments, the inclination angle of the feed chute 51 and the discharge chute 52 can be selected as 30 degrees. The mixing section 5 can perform mixing treatment on the granular solid plastic in the molten plastic, while the pin section 6 further mixes the mixed plastic to reduce the amount of solid plastic in the molten plastic, make the composition more uniform, and improve the quality of the plastic.

[0057] The feed chute 51 and the discharge chute 52 are separated by a barrier ridge, and there is a barrier gap 53 between the barrier ridge and the barrel.

[0058] It should be noted that the molten plastic entering the feed tank 51 from the homogenization section 4 still contains granular solid plastic. When the molten plastic enters the discharge tank 52 from the barrier ridge, the small particles that have not yet melted and plasticized will be subjected to shearing and extrusion in the barrier gap 53, causing a large amount of mechanical energy to be converted into heat energy, which melts the small particles of solid plastic and improves the molten state of the plastic. At the same time, due to the rotation of the screw 1, the molten plastic in the feed tank 51 and the discharge tank 52 will undergo vortex circulation, which will make the components in the molten plastic mix more evenly and the quality better.

[0059] The feed chute 51 is milled through one section near the homogenization section 4, and the discharge chute 52 is milled through one side near the pin section 6.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A corrugated double-threaded barrier pin screw, comprising a feeding section, a melting section, and a homogenizing section, characterized in that, The melting section includes a main thread, a secondary thread, a melting groove, and a solid groove; The main thread is formed by extending the feeding thread of the feeding section and extends to the end of the homogenization section, and the lead of the feeding thread at the end of the feeding section is increased, so that the pitch of the main thread is greater than the pitch of the feeding thread. The auxiliary thread is newly formed by the pushing surface at the end of the feeding thread and extends to the end of the homogenization section to merge with the main thread. The auxiliary thread divides the feeding thread groove of the feeding section into the molten groove and the solid groove in the melting section. The thread height and thread width of the auxiliary thread are both lower than those of the main thread. The depth of the melting tank gradually increases from shallow to deep in the melting section and decreases from deep to shallow in the homogenization section; The pitch of the main thread is 1.25 times the pitch of the feeding thread, and the width of the solid groove is smaller than the width of the feeding thread groove of the feeding section. The pitch of the auxiliary thread in the molten section is the same as that of the main thread in the molten section; the pitch of the auxiliary thread gradually increases in the homogenization section, and the auxiliary thread merges with the main thread at the end of the homogenization section. The depth of the solid tank gradually decreases from deep to shallow in the melting section; The width of the secondary thread's thread ridge is 0.5 to 0.7 times that of the primary thread's thread ridge width; the difference in thread ridge height between the primary thread and the secondary thread is 0.1 to 0.15 times the width of the primary thread's thread ridge. The depth of the feeding thread groove is 2.3 to 2.5 times the depth of the groove after the main thread and auxiliary thread at the end of the homogenization section are combined.

2. The corrugated double-threaded barrier pin screw according to claim 1, characterized in that, The homogenization section has a mixing section and a pin section integrally formed on the side away from the melting section; the mixing section includes a barrier head, and the barrier head is provided with an inclined feed chute and a discharge chute; the pin section is provided with a plurality of staggered pins.

3. The corrugated double-threaded barrier pin screw according to claim 2, characterized in that, The feed trough and the discharge trough are separated by a barrier ridge, and there is a barrier gap between the barrier ridge and the barrel.

4. The corrugated double-threaded barrier pin screw according to claim 3, characterized in that, The feed chute is milled through on one side near the homogenization section, and the discharge chute is milled through on the other side near the pin section.

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