A high-strength hot runner nozzle

Abstract

This utility model discloses a high-strength hot runner nozzle, relating to the field of injection molding technology. It includes a nozzle body and a fixed cylinder coaxially fixed to the end of the nozzle body. The nozzle body, away from the fixed cylinder, has three contact parts arranged coaxially in sequence along the direction away from the fixed cylinder. The radius of the cross-section of the outer arc wall of contact part one facing away from the fixed cylinder is smaller than the radius of the cross-section of the end closer to the fixed cylinder, and both ends have a smooth transition. The radius of the cross-section of contact part two is slightly larger than the radius of the cross-section of contact part one away from the fixed cylinder. This utility model, by adding contact parts one, two, and three, provides oblique and radial support respectively when in contact with the mold, and all are thickened. This increases the bending strength by increasing the moment of inertia of the cross-section, resisting deformation caused by thermal stress. Furthermore, the nozzle body is made entirely of special materials, which can withstand long-term erosion due to high glass fiber content, thus improving its service life.

Description

Technical Field

[0001] This utility model relates to the field of injection molding, specifically a high-strength hot runner nozzle. Background Technology

[0002] High glass fiber plastics (such as PA66+GF50% and PBT+GF30%) significantly improve the mechanical strength, heat resistance and dimensional stability of the material by adding glass fiber (GF).

[0003] Traditional hot runner nozzles are mostly made of ordinary materials, which are hard enough to resist the micro-cutting action of glass fiber. In addition, traditional threaded connections require multiple rotations to tighten, and each disassembly and assembly takes a long time and is inconvenient.

[0004] To address these issues, we designed a high-strength hot runner nozzle. Utility Model Content

[0005] The purpose of this invention is to provide a high-strength hot runner nozzle to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a high-strength hot runner nozzle, including a nozzle body and a fixing cylinder coaxially fixed to the end of the nozzle body. The nozzle body is provided with a first contact part, a second contact part, and a third contact part in sequence along the direction away from the fixing cylinder. The cross-sectional radius of the outer arc wall of the first contact part facing away from the fixing cylinder is smaller than the cross-sectional radius of the end close to the fixing cylinder, and the two ends are smoothly transitioned. The cross-sectional radius of the second contact part is slightly larger than the cross-sectional radius of the first contact part away from the fixing cylinder.

[0007] The radius of the third contact section is smaller than that of the second contact section, and there is a smooth transition between the second and the third contact section. Both the second and the third contact sections are annular structures, and the first contact section and the transition between the second and the third contact section are thickened.

[0008] Furthermore, the fixed cylinder is equipped with limiting mechanisms at both ends not along its axial direction. The limiting mechanisms include a turntable coaxially disposed on the inner end side of the fixed cylinder. A ring gear is coaxially fixed on the side wall of the turntable near the mouthpiece body. A bevel gear meshes with the ring gear on one side of the fixed cylinder along its radial direction. A housing is fixed on the outer wall of the fixed cylinder at the position corresponding to the bevel gear. A fixed shaft is fixed at the end of the bevel gear away from the axial direction of the fixed cylinder. The fixed shaft passes through the fixed cylinder and the housing in sequence and rotates relative to each other. A crank handle is coaxially fixed at the end of the fixed shaft that passes through the housing. Multiple slots are provided on the side wall of the crank handle and the housing that are close to each other, arranged in a ring array about the axial direction of the crank handle. A pin is slidably disposed in the slot.

[0009] Furthermore, multiple sliding plates arranged in a circular array about the axis of the turntable are slidably disposed on one side wall of the turntable near the interior of the fixed cylinder. A fixed plate is slidably disposed on the side wall of the sliding plate away from the turntable. The fixed plate is coaxially disposed with the annular toothed plate. The same fixed tube is coaxially fixed on the side wall of the two fixed plates that are close to each other. A storage channel is coaxially opened through the center of the side wall of the turntable and the side wall of the fixed plate that are close to each other. Sliding columns with the same structure are coaxially fixed on the side wall of the sliding plate that are close to the turntable and the fixed plate respectively. Multiple sliding grooves are opened on the side wall of the turntable near the fixed plate, arranged in a circular array about the axis of the turntable. One end of the sliding groove is set towards the storage channel, and the other end is bent and extended towards the outer edge of the turntable. The sliding column of the sliding plate close to the turntable slides in the sliding groove. Multiple sliding grooves correspond one-to-one with multiple sliding plates.

[0010] Furthermore, the fixed disk has multiple sliding grooves arranged in a circular array along the axis of the fixed disk on one side wall near the turntable. The length direction of the sliding grooves is consistent with the radial direction of the fixed disk. Multiple sliding plates correspond one-to-one with multiple sliding grooves. The sliding column on the side wall of the sliding plate near the fixed disk slides in the sliding groove. The same rotating cylinder is fixed on the outer arc wall of the two turntables, and the radius of the outer arc wall of the fixed disk is smaller than the radius of the inner arc wall of the rotating cylinder. The rotating cylinder rotates on the inner arc wall of the fixed cylinder.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By adding contact part one, contact part two and contact part three, oblique support and radial support are provided respectively when in contact with the mold, and all of them are thickened. By increasing the moment of inertia of the cross section, the bending strength is improved and the deformation caused by thermal stress is resisted. In addition, the entire nozzle body is made of special materials, which can withstand long-term erosion with high glass fiber content and improve service life.

[0013] 2. By rotating the bevel gear with a crank handle, the ring gear and turntable are driven to rotate synchronously, realizing the radial extension and retraction of the skateboard, thereby achieving fixed installation, simplifying the operation process and lowering the operation threshold. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the internal structure of the nozzle body in this utility model;

[0016] Figure 3 This is a cross-sectional view of the internal structure of the fixed cylinder in this utility model;

[0017] Figure 4 This is an exploded view of the limiting mechanism in this utility model.

[0018] In the picture:

[0019] 10. Mouthpiece body; 101. Contact part one; 102. Contact part two; 103. Contact part three; 11. Fixing cylinder; 111. Fixing tube; 12. Housing; 13. Crank handle; 14. Pin;

[0020] 20. Ring gear; 21. Bevel gear; 22. Turntable; 23. Slide plate; 24. Fixed plate. Detailed Implementation

[0021] 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.

[0022] Please see the appendix Figure 1 To be continued Figure 4 This utility model provides a technical solution: a high-strength hot runner nozzle, including a nozzle body 10 and a fixing cylinder 11 coaxially fixed to the end of the nozzle body 10. The nozzle body 10 is provided with a first contact part 101, a second contact part 102 and a third contact part 103 in sequence along the direction away from the fixing cylinder 11. The cross-sectional radius of the outer arc wall of the first contact part 101 facing away from the fixing cylinder 11 is smaller than the cross-sectional radius of the end close to the fixing cylinder 11, and the two ends are smoothly transitioned. The cross-sectional radius of the second contact part 102 is slightly larger than the cross-sectional radius of the end of the first contact part 101 away from the fixing cylinder 11.

[0023] The radius of the cross section of the third contact part 103 is smaller than that of the cross section of the second contact part 102, and there is a smooth transition between the second contact part 102 and the third contact part 103. Both the second contact part 102 and the third contact part 103 are annular structures, and the transition between the first contact part 101 and the second contact part 102 and the third contact part 103 is thickened.

[0024] The fixed cylinder 11 is provided with limiting mechanisms at both ends that are not along its axial direction. The limiting mechanism includes a turntable 22 coaxially disposed on the inner end side of the fixed cylinder 11. The turntable 22 near the mouthpiece body 10 is coaxially fixed with an annular gear disk 20 on the side wall near the mouthpiece body 10. The annular gear disk 20 is meshed with a bevel gear 21 on one side of the fixed cylinder 11 along the radial direction.

[0025] A housing 12 is fixed on the outer wall of the fixed cylinder 11 at the position corresponding to the bevel gear 21. A fixed shaft is fixed at the end of the bevel gear 21 away from the axial direction of the fixed cylinder 11. The fixed shaft passes through the fixed cylinder 11 and the housing 12 in sequence and rotates relative to each other. A crank handle 13 is coaxially fixedly connected to the end of the fixed shaft that passes through the housing 12. Multiple slots are provided on the side wall of the crank handle 13 that are close to each other with respect to the axial direction of the crank handle 13. A pin 14 is slidably provided in the slot.

[0026] In practice, the radius of the outer arc wall of the contact part 101 gradually decreases from the end near the fixed cylinder 11 to the end, forming a smooth transition flow channel contraction section, guiding the melt to smoothly transition from the large diameter flow channel of the fixed cylinder 11 to the small diameter flow channel, reducing turbulence and glass fiber breakage caused by abrupt changes in cross section.

[0027] The radius of the second contact section 102 is slightly larger than the end of the first contact section 101, forming a short expansion section to disperse the glass fiber bundles gathered in the melt, avoid excessive local concentration and aggravate wear, and at the same time reduce the melt flow rate through the expansion section to reduce the impact on the downstream third contact section 103.

[0028] The radius of the third contact part 103 is smaller than that of the second contact part 102, forming the final runner outlet, matching the mold gate size, and connecting with the second contact part 102 through rounded corners to eliminate right-angle dead corners and prevent melt retention and decomposition. The wall thickness at the transition is increased to improve the resistance to heat deformation and adapt to long-term high-temperature working conditions.

[0029] See appendix Figure 1 To be continued Figure 4 Multiple sliding plates 23 are slidably arranged in a circular array about the axis of the turntable 22 on one side wall near the inside of the fixed cylinder 11. A fixed plate 24 is slidably arranged on one side wall away from the turntable 22. The fixed plate 24 is coaxially arranged with the annular toothed plate 20. The same fixed tube 111 is coaxially fixed on one side wall of two fixed plates 24 that are close to each other.

[0030] The turntable 22 and the fixed plate 24 are coaxially connected at the center of their respective side walls, and the slide plate 23 is coaxially fixed with the same sliding column on its side wall near the turntable 22 and the fixed plate 24. The turntable 22 is provided with a plurality of slide grooves arranged in a ring array about the axis of the turntable 22 on its side wall near the fixed plate 24. One end of the slide groove is set towards the storage channel, and the other end is bent and extended towards the outer edge of the turntable 22. The slide column of the slide plate 23 near the turntable 22 slides in the slide groove. The plurality of slide grooves correspond one-to-one with the plurality of slide plates 23.

[0031] The fixed disk 24 has multiple sliding grooves arranged in a ring array along the axial direction of the fixed disk 24 on one side wall near the turntable 22. The length direction of the sliding grooves is consistent with the radial direction of the fixed disk 24. Multiple sliding plates 23 correspond one-to-one with multiple sliding grooves 2. The sliding column on the side wall of the sliding plate 23 near the fixed disk 24 slides in the sliding groove 2. The same rotating cylinder is fixed on the outer arc wall of the two turntables 22, and the radius of the outer arc wall of the fixed disk 24 is smaller than the radius of the inner arc wall of the rotating cylinder. The rotating cylinder rotates on the inner arc wall of the fixed cylinder 11.

[0032] In practice, the operator turns the crank handle 13, which drives the bevel gear 21 to rotate through the fixed shaft. The bevel gear 21 meshes with the ring gear disk 20, transmitting the rotational motion to the turntable 22. When the turntable 22 initially rotates, the slide column of the slide plate 23 slides along the spiral section. Under the restriction of the second slide groove, the slide plate 23 is forced to slide along the second slide groove. The second slide groove restricts the slide plate 23 to slide only radially, avoiding circumferential offset. The two fixed disks 24 are connected by the fixed tube 111, which serves as a guide and also isolates heat transfer to reduce heat loss. After the crank handle 13 is rotated to the position, the pin 14 is inserted into the slot to prevent the bevel gear 21 from reversing and causing loosening, ensuring the reliability of the connection.

[0033] Working principle: The melt enters the nozzle body 10 through the fixed cylinder 11. The outer arc wall radius of the first contact part 101 gradually decreases to form a smooth contraction section, which guides the melt to transition smoothly and reduces turbulence and glass fiber breakage. The radius of the second contact part 102 increases slightly to form a short expansion section, which disperses the glass fiber bundles and reduces the flow velocity, reducing the impact on the third contact part 103. The radius of the third contact part 103 decreases to form an outlet, which smoothly transitions with the second contact part 102 to prevent melt stagnation. The transition area is thickened to resist thermal deformation.

[0034] When disassembly or assembly is required, turn the crank handle 13, which drives the bevel gear 21 to rotate via the fixed shaft. The bevel gear 21 drives the ring gear disk 20 and the turntable 22 to rotate. The slide plate 23 on the turntable 22 slides along the spiral section of the slide groove, and at the same time moves radially under the restriction of the second slide groove of the fixed disk 24, pushing the fixed disk 24 to press or loosen the distributor plate, thus achieving quick disassembly or assembly. Finally, insert the pin 14 into the slot to prevent the bevel gear 21 from reversing and ensure a stable connection.

Claims

1. A high-strength hot runner nozzle, comprising a nozzle body (10) and a fixing cylinder (11) coaxially fixed to the end of the nozzle body (10), characterized in that: The nozzle body (10) is provided with a first contact part (101), a second contact part (102) and a third contact part (103) in a coaxial manner along the direction away from the fixed cylinder (11) at one end. The outer arc wall of the first contact part (101) facing away from the fixed cylinder (11) has a cross-sectional radius smaller than that of the end closer to the fixed cylinder (11), and the two ends are smoothly transitioned. The cross-sectional radius of the second contact part (102) is slightly larger than that of the end of the first contact part (101) away from the fixed cylinder (11). The cross-sectional radius of the third contact part (103) is smaller than that of the second contact part (102), and there is a smooth transition between the second contact part (102) and the third contact part (103). Both the second contact part (102) and the third contact part (103) are annular structures, and the transition between the first contact part (101) and the second contact part (102) and the third contact part (103) is thickened.

2. The high-strength hot runner nozzle as described in claim 1, characterized in that: The fixed cylinder (11) is provided with limiting mechanisms at both ends that are not along its axial direction. The limiting mechanism includes a turntable (22) coaxially disposed on the inner end side of the fixed cylinder (11). The turntable (22) near the mouthpiece body (10) has an annular gear disk (20) coaxially fixed on one side wall near the mouthpiece body (10). The annular gear disk (20) is meshed with a bevel gear (21) on one side of the fixed cylinder (11) along the radial direction.

3. The high-strength hot runner nozzle as described in claim 2, characterized in that: A housing (12) is fixed on the outer wall of the fixed cylinder (11) at the position corresponding to the bevel gear (21). A fixed shaft is fixed at one end of the bevel gear (21) away from the axial direction of the fixed cylinder (11). The fixed shaft passes through the fixed cylinder (11) and the housing (12) in sequence and rotates with each other. A crank handle (13) is coaxially fixed at one end of the fixed shaft that passes through the housing (12). Multiple slots are provided on the side wall of the crank handle (13) that are close to each other with respect to the axial direction of the crank handle (13). A pin (14) is slidably provided in the slot.

4. A high-strength hot runner nozzle as described in claim 2, characterized in that: On one side wall of the turntable (22) near the interior of the fixed cylinder (11), multiple sliding plates (23) are arranged in a ring array about the axis of the turntable (22). On the side wall of the sliding plates (23) away from the turntable (22), a fixed plate (24) is slidably arranged. The fixed plate (24) is coaxially arranged with the annular toothed plate (20). On the side wall of the two fixed plates (24) that are close to each other, the same fixed tube (111) is coaxially fixed.

5. A high-strength hot runner nozzle as described in claim 4, characterized in that: The turntable (22) and the fixed plate (24) are both coaxially connected at the center of their side walls. The slide plate (23) is coaxially fixed with the same sliding column on the side wall of the turntable (22) and the fixed plate (24). The turntable (22) is provided with a plurality of slide grooves arranged in a ring array about the axis of the turntable (22) on the side wall of the turntable (22) near the fixed plate (24). One end of the slide groove is set towards the storage channel, and the other end is bent and extended towards the outer edge of the turntable (22). The slide column of the slide plate (23) near the turntable (22) slides in the slide groove. The plurality of slide grooves correspond one-to-one with the plurality of slide plates (23).

6. A high-strength hot runner nozzle as described in claim 4, characterized in that: On one side wall of the fixed disk (24) near the turntable (22), there are multiple sliding grooves arranged in a ring array about the axis of the fixed disk (24). The length direction of the sliding grooves is consistent with the radial direction of the fixed disk (24). Multiple sliding plates (23) correspond one-to-one with multiple sliding grooves. The sliding column on the side wall of the sliding plate (23) near the fixed disk (24) slides in the sliding groove. The same rotating cylinder is fixed on the outer arc wall of the two turntables (22), and the radius of the outer arc wall of the fixed disk (24) is smaller than the radius of the inner arc wall of the rotating cylinder. The rotating cylinder rotates on the inner arc wall of the fixed cylinder (11).

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