A dual-valve needle nozzle structure, injection molding device and application

Abstract

A dual-valve needle nozzle structure, injection molding device, and application are disclosed. The dual-valve needle nozzle structure includes: a nozzle body, an outer valve needle, and an inner valve needle; the outer valve needle is limited to move within the secondary material cavity; in a first moving state, the outer valve needle isolates the main material cavity from the nozzle output port; in a second moving state, the outer valve needle connects the main material cavity to the nozzle output port; the inner valve needle is limited to move within its own cavity; in the first moving state, the inner valve needle isolates the secondary material cavity from the nozzle output port; in the second moving state, the inner valve needle connects the secondary material cavity to the nozzle output port. This solution provides a dual-valve needle nozzle structure that can input two different materials into the nozzle body as needed. By adjusting the movements of the outer and inner valve needles corresponding to the main and secondary material cavities respectively, the dual-valve needle nozzle structure can uniformly output any material as needed, solving the problem of material contamination caused by overly complex material switching steps in existing material injection molding processes.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment, and more particularly to a dual-valve needle nozzle structure, an injection molding device, and its application. Background Technology

[0002] To achieve different performance or decorative effects, existing injection-molded parts often employ a dual injection molding process, such as first injecting material A and then injecting material B to form the structure of a composite bottle. However, the existing dual injection molding process is complex. On the one hand, it requires frequent switching of injection nozzles, making the processing cumbersome. On the other hand, when switching between injection material A and material B, residues of the two materials may remain in the nozzle, leading to contamination of the nozzle and the molded material, which affects the performance of the composite bottle. Summary of the Invention

[0003] The purpose of this invention is to propose a dual-valve needle nozzle structure that can input two different materials into the nozzle body as needed. By adjusting the movement of the outer and inner valve needles corresponding to the main material cavity and the auxiliary material cavity, the dual-valve needle nozzle structure can uniformly output any material as needed, and can be widely used in injection molding of combination bottles.

[0004] The present invention also proposes an injection molding device that uses the above-described dual-valve needle nozzle structure.

[0005] The present invention also proposes the use of an injection molding device in the preparation of composite bottles.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A dual-valve needle nozzle structure includes: a nozzle body, an outer valve needle, and an inner valve needle;

[0008] The nozzle body has a main material cavity inside, and the main material cavity has a secondary material cavity inside; the outlet of the secondary material cavity is linearly close to and connected to the nozzle outlet of the main material cavity.

[0009] The outer valve needle is limited to move within the auxiliary material cavity; in the first moving state, the end of the outer valve needle moves toward the nozzle output port, and the outer side wall of the outer valve needle abuts against the nozzle output port to isolate the main material cavity from the nozzle output port; in the second moving state, the end of the outer valve needle moves away from the nozzle output port, and the outer valve needle disengages from the nozzle output port to allow the main material cavity to communicate with the nozzle output port.

[0010] The outer valve needle is provided with a needle cavity, and the needle cavity is provided with a needle outlet at one end facing the outlet of the cavity. The side wall of the needle cavity is provided with a secondary material passage hole, which connects the needle cavity and the secondary material cavity.

[0011] The inner valve needle is limited to move within the needle cavity; in the first moving state, the end of the inner valve needle moves toward the needle output port, and the inner valve needle moves to block the auxiliary material passage hole through the outer wall, so that the auxiliary material cavity is isolated from the nozzle output port; in the second moving state, the end of the inner valve needle moves away from the needle output port, and the outer wall of the inner valve needle disengages from the auxiliary material passage hole, so that the auxiliary material cavity is connected to the nozzle output port.

[0012] Optimally, the nozzle outlet includes, from the inside to the outside, a cutting cylindrical portion and a narrowing portion;

[0013] The cut cylindrical portion is cylindrical; the inner diameter of the narrowed portion gradually decreases from the inside to the outside, so that the inner wall of the narrowed portion forms a beveled end face;

[0014] The outer side of the outer valve needle is provided with an outer conical end face at the end, and the outer diameter of the outer conical end face gradually increases towards the nozzle output port;

[0015] The outer conical end face and the outer side of the outer valve needle sequentially enter the nozzle output port; the outer side of the outer valve needle is aligned with the cutting cylindrical portion; the outer side of the outer valve needle moves against the inner wall of the cutting cylindrical portion, and the two cut the material at the nozzle output port during relative movement; the outer conical end face abuts against the inner side wall of the narrowing portion.

[0016] Optimally, the inner radial direction of the inner cavity outlet gradually decreases towards the nozzle outlet;

[0017] When the outer valve needle reaches the end point of its first moving state, the auxiliary material moves through the hole to abut or approach the smallest inner diameter of the inner cavity outlet.

[0018] When the outer valve needle reaches the end of its second moving state, the auxiliary material moves through the hole to a position close to the maximum inner diameter of the inner cavity output port.

[0019] Optimally, when the inner valve needle reaches the end of its movement in the second moving state, the end of the inner valve needle is aligned with or close to the auxiliary material passage hole.

[0020] Optimally, the auxiliary material is disposed on two opposing sidewalls of the needle cavity through the hole; the auxiliary material through the hole is inclined toward the needle output port, so that the inner sidewall of the auxiliary material through the hole furthest from the needle output port forms an inclined guide wall;

[0021] The end of the inner valve needle is an end plane; when the inner valve needle reaches the end point of its second moving state, the end plane is horizontally aligned with the inclined guide wall.

[0022] Optimally, it may also include: an injection molding pressurization device;

[0023] One of the injection molding pressurizing devices is connected to the main material cavity and is used to control the pressure inside the main material cavity;

[0024] One of the injection molding pressurizing devices is connected to the inner cavity of the auxiliary material and is used to control the pressure inside the inner cavity of the auxiliary material.

[0025] Optimally, the outer wall of the auxiliary material cavity is attached to the inner wall of the main material cavity, and the outer wall of the auxiliary material cavity is provided with a spiral groove along its length. The spiral groove and the inner wall of the main material cavity form a material conveying channel, and the end of the material conveying channel is connected to the nozzle output port.

[0026] An injection molding apparatus includes: a moving drive and the above-described dual-valve needle nozzle structure;

[0027] The output of a portion of the moving driver is connected to the outer valve needle, which is used to drive the outer valve needle to move within the inner cavity of the auxiliary material, so that the outer valve needle is adjusted to a first moving state or a second moving state.

[0028] The output of a portion of the moving driver is connected to the inner valve needle, and is used to drive the inner valve needle to move within the needle cavity, so that the inner valve needle is adjusted to a first moving state or a second moving state.

[0029] Optimally, the mobile actuator includes: a cylinder;

[0030] The output end of the cylinder is connected to the inner valve needle or the outer valve needle.

[0031] The use of an injection molding device in the preparation of composite bottles, wherein the injection molding device is the aforementioned injection molding device;

[0032] The combined bottle comprises: an outer layer and an inner layer; the inner layer is located between the outer sidewall and the inner sidewall of the outer layer, or the inner layer is located on the inner sidewall of the outer layer; the outer layer is formed from material A; the inner layer is formed from material B;

[0033] Material A is input into the input terminal of the main material cavity; material B is input into the input terminal of the auxiliary material cavity.

[0034] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0035] This solution provides a dual-valve needle nozzle structure that can input two different materials into the nozzle body as needed. By adjusting the movement of the outer and inner valve needles corresponding to the main material cavity and the auxiliary material cavity, the dual-valve needle nozzle structure can uniformly output any material as needed. It can be widely used in injection molding of combination bottles and solves the problem that the material switching steps between materials in the existing material injection molding process are too complicated, which leads to easy material contamination. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of one embodiment of a dual-valve needle nozzle structure in which the outer valve needle is in the second state and the inner valve needle is in the first state.

[0037] Figure 2 This is a schematic diagram of one embodiment of a dual-valve needle nozzle structure in which the outer valve needle is in the first state and the inner valve needle is in the first state.

[0038] Figure 3 This is a schematic diagram of one embodiment of a dual-valve needle nozzle structure in which the outer valve needle is in the first state and the inner valve needle is in the second state.

[0039] Figure 4 This is a schematic diagram of one embodiment of the injection molding device;

[0040] Figure 5 This is a partial structural schematic diagram of one embodiment of the external conical end face at the nozzle outlet.

[0041] in:

[0042] Nozzle body 1; outer valve needle 2; inner valve needle 3; injection molding pressurization device 4; moving drive 5;

[0043] Main material inner cavity 11; secondary material inner cavity 12; cut cylindrical part 13; narrowing part 14;

[0044] Nozzle outlet 111; Inner cavity outlet 121; Spiral groove 122; Material conveying channel 123;

[0045] Inclined end face 141;

[0046] 21. Needle inner cavity; 22. Needle outlet; 23. Outer conical end face;

[0047] Substrate through hole 31; inclined guide wall 32; end plane 33. Detailed Implementation

[0048] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "inner side," "outer side," "inner end," "outer end," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0050] like Figure 1 A dual-valve needle nozzle structure includes: a nozzle body 1, an outer valve needle 2, and an inner valve needle 3;

[0051] The nozzle body 1 has a main material cavity 11 inside, and a secondary material cavity 12 is provided inside the main material cavity 11; the outlet 121 of the secondary material cavity 12 is linearly close to and connected to the nozzle outlet 111 of the main material cavity 11.

[0052] The outer valve needle 2 is limited to move within the auxiliary material cavity 12; in the first moving state, the end of the outer valve needle 2 moves toward the nozzle output port 111, and the outer side wall of the outer valve needle 2 abuts against the nozzle output port 111 to isolate the main material cavity 11 from the nozzle output port 111; in the second moving state, the end of the outer valve needle 2 moves away from the nozzle output port 111, and the outer valve needle 2 disengages from the nozzle output port 111 to allow the main material cavity 11 to communicate with the nozzle output port 111.

[0053] The outer valve needle 2 is provided with a needle cavity 21. The needle cavity 21 is provided with a needle output port 22 at one end facing the output port 121 of the cavity. The side wall of the needle cavity 21 is provided with a secondary material passage hole 31, which connects the needle cavity 21 and the secondary material cavity 12.

[0054] The inner valve needle 3 is limited to move within the needle cavity 21; in the first moving state, the end of the inner valve needle 3 moves toward the needle output port 22, and the inner valve needle 3 moves to block the auxiliary material passage hole 31 through the outer wall, so that the auxiliary material cavity 12 is isolated from the nozzle output port 111; in the second moving state, the end of the inner valve needle 3 moves away from the needle output port 22, and the outer wall of the inner valve needle 3 disengages from the auxiliary material passage hole 31, so that the auxiliary material cavity 12 is connected to the nozzle output port 111.

[0055] This solution provides a dual-valve needle nozzle structure that can input two different materials into the nozzle body 1 as needed. By adjusting the movement of the outer valve needle 2 and inner valve needle 3 corresponding to the main material cavity 11 and the auxiliary material cavity 12 respectively, the dual-valve needle nozzle structure can output any material evenly as needed. It can be widely used in injection molding of combination bottles and solves the problem that the material switching steps between materials in the existing material injection molding process are too complicated, which leads to easy material contamination.

[0056] Specifically, the nozzle body 1 has a main material cavity 11 and a secondary material cavity 12, which can receive different materials respectively; for example, material A can be introduced into the main material cavity 11, and material B can be introduced into the secondary material cavity 12; the main material cavity 11 has a nozzle output port 111, and material A in the main material cavity 11 can be output to the mold through the nozzle output port 111; since the inner cavity output port 121 of the secondary material cavity 12 is aligned with the nozzle output port 111 of the main material cavity 11, and the two are close to and connected, material B in the secondary material cavity 12 can be output to the main material cavity 11 through the inner cavity output port 121, and then discharged from the main material cavity 12. The material from cavity 11 is output to nozzle output port 111. This design uses a needle-within-needle structure, with an outer valve needle 2 located in the auxiliary material cavity 12. The needle cavity 21 within the outer valve needle 2 contains an inner valve needle 3. The outer valve needle 2 is limited in its movement within the auxiliary material cavity 12 and has at least two movement states. The first movement state of the outer valve needle 2 is blocking the nozzle output port 111, where the outer valve needle 2 abuts against the inner cavity output port 121 at its end, and the outer side wall of the outer valve needle 2 abuts against the inner side wall of the inner cavity output port 121, thereby blocking the nozzle output port 111. Material A from the main material cavity 11 cannot be output outside the nozzle output port 111. Figure 2 The second moving state of the outer valve needle 2 is the open state of the nozzle output port 111. The outer valve needle 2 moves away from the nozzle output port 111, and the outer side wall of the outer valve needle 2 disengages from the inner side wall of the nozzle output port 111, thereby exposing the nozzle output port 111. The material A in the main material cavity 11 is output to the outside through the nozzle output port 111, such as... Figure 1The outer valve needle 2 has an inner cavity 21 to accommodate the inner valve needle 3. The side wall of the inner cavity 21 has a secondary material passage hole 31 connecting the inner cavity 21 and the secondary material cavity 12. The inner valve needle 3 can move within the inner cavity 21. Similarly, the inner valve needle 3 has at least two movement states. The inner valve needle 3 can move linearly and pass through the secondary material passage hole 31. Generally, the secondary material cavity 12, the secondary material passage hole 31, and the needle output port 22 are connected sequentially. Material B travels along the secondary material cavity 12, the secondary material passage hole 31, and the needle output port 22, and then passes through the main material cavity 12. 1. Output to nozzle output port 111; The first moving state of the inner valve needle 3 is the state of blocking the needle output port 22. The inner valve needle 3 moves through the auxiliary material passage hole 31 on the side wall of the needle inner cavity 21. The inner valve needle 3 uses its own outer side wall to block the auxiliary material passage hole 31, thereby blocking the auxiliary material passage hole 31 between the auxiliary material inner cavity 12 and the needle output port 22. The material B in the auxiliary material inner cavity 12 cannot be output to the inner cavity output port 121, that is, the material B will not be output to the nozzle output port 111. Therefore, the first moving state of the inner valve needle 3 will restrict the output of material B. Figure 1 and Figure 2 The second moving state of the inner valve needle 3 is when the inner cavity output port 121 is exposed. When the inner valve needle 3 moves to the point where the outer wall is disengaged from the auxiliary material passage hole 31, the auxiliary material passage hole 31 between the auxiliary material inner cavity 12 and the inner cavity output port 121 is in a hollowed-out state. The material B in the auxiliary material inner cavity 12 can be output to the inner cavity output port 121 through the main material inner cavity 11. Therefore, the second moving state of the inner valve needle 3 will output the material B to the nozzle output port 111. Figure 3 Thus, this solution allows for the selective output of injection molding raw materials from materials A and B by adjusting either the outer valve needle 2 or the inner valve needle 3 to either the first or second moving state as needed. For example, when material A needs to be fed in first, the outer valve needle 2 is adjusted to the second moving state, and the inner valve needle 3 is adjusted to the first moving state; when material B is fed in later, the outer valve needle 2 is adjusted to the first moving state, and the inner valve needle 3 is adjusted to the second moving state. This solution enables the dual-valve needle nozzle structure to uniformly output any material as needed, and can be widely used in injection molding of combination bottles and gradient color bottles, solving the problem of material contamination caused by overly complex material switching steps in existing material injection molding processes.

[0057] Optimally, the nozzle output port 111 includes, from the inside to the outside, a cutting cylindrical portion 13 and a narrowing portion 14;

[0058] The cut cylindrical portion 13 is cylindrical; the inner diameter of the narrowed portion 14 gradually decreases from the inside to the outside, so that the inner wall of the narrowed portion 14 forms a beveled end face 141.

[0059] The outer valve needle 2 has an outer conical end face 23 at its end on its outer side surface, and the outer diameter of the outer conical end face 23 gradually increases toward the nozzle output port 111;

[0060] The outer conical end face 23 and the outer side surface of the outer valve needle 2 sequentially enter the nozzle output port 111; the outer side surface of the outer valve needle 2 is aligned with the cutting cylindrical portion 13; the outer side surface of the outer valve needle 2 moves against the inner wall of the cutting cylindrical portion 13, and the two cut the material at the nozzle output port 111 during relative movement; the outer conical end face 23 abuts against the inner side wall of the narrowing portion 14.

[0061] The outer valve needle 2 in this design also has a material cutting function, such as... Figure 5 Specifically, the outer valve needle 2 has an outer conical end face 23 at its end. The outer diameter of the outer conical end face 23 gradually increases towards the nozzle output port 111. The outer conical end face 23 enters the cutting cylindrical part 13 at its smallest outer diameter, thus making it easier for the outer valve needle 2 to enter the cutting cylindrical part 13 and then abut against the inner wall of the narrowing part 14. Subsequently, the outer side of the outer valve needle 2 is guided to move against the inner wall of the cutting cylindrical part 13. When the outer side of the outer valve needle 2 just enters the cutting cylindrical part 13, the entrance edge of the cutting cylindrical part 13 has a rounded edge, and the junction between the outer side of the outer valve needle 2 and the outer conical end face 23 also has a rounded edge. When the two rounded edges approach each other, the material at the nozzle output port 111 will be cut off. During process 1, the material is pushed out of the nozzle body 1, thereby draining the material A output from the nozzle output port 111 in the main material cavity 11. At the same time, some material A may exist between the outer side of the outer valve needle 2 and the inner sidewall of the nozzle output port 111. However, this solution uses a needle-within-needle structure, and material B is mainly discharged from the needle cavity 21 inside the outer valve needle 2. At this time, the needle output port 22 is located in the middle of the nozzle output port 111. The output position of material B is far away from the position of residual material A. Therefore, the residual material A in the nozzle output port 111 will not affect the output of material B. Material A will not mix into material B, maintaining the purity of material B, thereby maintaining the purity of each layer of material in the injection molding of the composite bottle and ensuring the structural stability of the composite bottle.

[0062] Optimally, the inner radial direction of the inner cavity outlet 121 gradually decreases towards the nozzle outlet 111;

[0063] When the outer valve needle 2 reaches the end point of its first moving state, the auxiliary material moves through the hole 31 to abut or approach the smallest inner diameter of the inner cavity output port 121.

[0064] When the outer valve needle 2 reaches the end of its second moving state, the auxiliary material moves through the hole 31 to the position near the maximum inner diameter of the inner cavity output port 121.

[0065] The outer valve needle 2 of this scheme is used to control the output switch of material A. Preferably, the endpoints of the first and second moving states are associated with the output position of material B, so that the outer valve needle 2 is adjusted to the position most favorable for outputting material B. Specifically, the inner diameter of the inner cavity output port 121 gradually decreases. That is, when material B is output from the auxiliary material inner cavity 12 through the inner cavity output port 121, the output flow rate of material B at the inner cavity output port 121 increases due to the narrowing of the inner diameter, thereby improving the output efficiency of material B. At the endpoint of the first moving state, the outer valve needle 2... When the nozzle output port 111 is blocked, the auxiliary material through hole 31 moves to the point closest to the smallest inner diameter of the inner cavity output port 121. On the one hand, the flow rate of material B into the needle inner cavity 21 is the fastest, improving the output efficiency of material B. On the other hand, the auxiliary material through hole 31 and the inner cavity output port 121 can be infinitely close to each other at one end within the auxiliary material inner cavity 12. When outputting material B, material B is unlikely to remain in the section between the end of the inner valve needle 3 and the auxiliary material through hole 31. Combined with the acceleration effect of the narrowing inner wall on material B, the output of material B is more uniform and stable, improving the uniformity of the product. When the outer valve needle 2 reaches the end point of the second moving state, the auxiliary material through hole 31 moves to the point closest to the largest inner diameter of the inner cavity output port 121, and the distance between the inner cavity output port 121 and the auxiliary material inner cavity 12 is the largest, reducing the pressure of material B outside the auxiliary material through hole 31.

[0066] Ideally, when the inner valve needle 3 reaches the end of its movement in the second moving state, the end of the inner valve needle 3 is aligned with or close to the auxiliary material passage hole 31.

[0067] In the second moving state, the outer wall of the inner valve needle 3 disengages from the auxiliary material passage hole 31, exposing the auxiliary material passage hole 31. Preferably, in this design, when the inner valve needle 3 disengages from the auxiliary material passage hole 31, the end of the inner valve needle 3 remains aligned with or close to the auxiliary material passage hole 31. This reduces the distance between the inner valve needle 3 and the auxiliary material passage hole 31 in the second moving state, thereby reducing the movement of material B towards this distance and preventing material B from becoming blocked. Furthermore, it avoids differences in output parameters between blocked material B and normally output material B, which could affect the quality of the injection molded material. Simultaneously, a shorter distance reduces the response time of the inner valve needle 3, enabling the switching between the first and second moving states to be completed in a very short time.

[0068] Optimally, the auxiliary material is disposed on two opposing sidewalls of the needle cavity 21 through the hole 31; the auxiliary material through the hole 31 is inclined toward the needle output port 22, so that the inner sidewall of the auxiliary material through the hole 31 furthest from the needle output port 22 forms an inclined guide wall 32;

[0069] The end of the inner valve needle 3 is an end plane 33; when the inner valve needle 3 reaches the end point of its movement in the second moving state, the end plane 33 is horizontally aligned with the inclined guide wall 32.

[0070] like Figure 3 In this solution, the auxiliary material passage hole 31 can be designed to be horizontal as needed, and the number of auxiliary material passage holes 31 can be set to multiple. However, when multiple auxiliary material passage holes 31 exist, and multiple auxiliary material passage holes 31 feed simultaneously, the material B may move towards the inner valve needle 3 when the material B from different auxiliary material passage holes 31 enters horizontally towards each other due to the relatively high feeding speed of the material B. This can lead to the material B easily remaining on the inner wall of the needle cavity 21, especially at the position between the end of the inner valve needle 3 and the auxiliary material passage hole 31. To address this, in the optimal embodiment of this solution, the auxiliary material passage holes 31 can be set in pairs, specifically inside the needle. The cavity 21 has two opposing sidewalls; the auxiliary material through hole 31 is inclined toward the needle output port 22; when the auxiliary material through hole 31 is inclined, the auxiliary material through hole 31 can output material B to the needle output port 22 at an angle, and material B can be output along the inclined guide wall 32. The opposing needle output ports 22 can tilt and counteract material B, so that material B adheres upward to the inner sidewall of the needle cavity 21; in particular, the end plane 33 of the inner valve needle 3 is located at the inclined guide wall 32, which can prevent material B from extending upward, thereby avoiding material B residue, maintaining the stability of material B output parameters, and preventing material B remaining in the needle cavity 21 from affecting product performance.

[0071] Optimally, it also includes: an injection molding pressurization device 4;

[0072] One of the injection molding pressurizing devices 4 is connected to the main material cavity 11 and is used to control the pressure inside the main material cavity 11;

[0073] One of the injection molding pressurizing devices 4 is connected to the auxiliary material cavity 12 and is used to control the pressure inside the auxiliary material cavity 12.

[0074] The injection molding pressurization device 4 used in this solution is a pressure control device known in the injection molding industry, such as a liquid pressurization pump. The main material cavity 11 and the auxiliary material cavity 12 are controlled by independent injection molding pressurization devices 4. In the processing of the composite bottle, this solution can output material A or material B at a specific pressure as needed. Each layer of material can be injection molded at the optimal pressure. Due to the use of a needle-within-needle structure, the materials do not affect each other when output at different pressures.

[0075] Optimally, the outer side wall of the auxiliary material cavity 12 is attached to the inner side wall of the main material cavity 11. The outer side wall of the auxiliary material cavity 12 is provided with a spiral groove 122 along the length direction. The spiral groove 122 and the inner side wall of the main material cavity 11 form a material conveying channel 123. The end of the material conveying channel 123 is connected to the nozzle output port 111.

[0076] The outer wall of the auxiliary material cavity 12 is attached to the inner wall of the main material cavity 11, and a spiral groove 122 is provided on the outer wall of the auxiliary material cavity 12. The spiral groove 122 extends spirally and can guide material A to be output to the nozzle output port 111. In this way, the auxiliary material cavity 12 and the main material cavity 11 are attached to each other, which can increase the contact area between the two and ensure the connection stability. The cavity output port 121 and the nozzle output port 111 are kept in a straight line alignment. At the same time, since this solution is a needle-within-needle structure, the overall size of the dual-valve needle nozzle structure can be made smaller. The material is conveyed through the material conveying channel 123 instead of the main material cavity 11. The residue of material A in the main material cavity 11 is smaller, which simplifies the overall structure of the dual-valve needle nozzle structure. It has the advantages of small size and high-efficiency material conveying, and reduces the production cost of the dual-valve needle nozzle structure.

[0077] An injection molding apparatus includes: a motion driver 5 and a dual-valve needle nozzle structure according to any of the above embodiments;

[0078] The output of part of the moving driver 5 is connected to the outer valve needle 2, which is used to drive the outer valve needle 2 to move within the auxiliary material cavity 12, so that the outer valve needle 2 is adjusted to the first moving state or the second moving state.

[0079] The output terminal of the moving driver 5 is connected to the inner valve needle 3, which drives the inner valve needle 3 to move within the needle cavity 21, so that the inner valve needle 3 is adjusted to the first moving state or the second moving state.

[0080] The movable actuator 5 in this solution can be implemented by a known mechanism with a driving and moving function, such as a combination of a hydraulic cylinder, a motor and a lead screw, a combination of gears and racks, a robotic arm, etc.; one movable actuator 5 drives the outer valve needle 2 to move, and the other movable actuator 5 drives the inner valve needle 3 to move. The outer valve needle 2 and the inner valve needle 3 are adjusted by different movable actuators 5, thereby improving the controllability of the outer valve needle 2 and the inner valve needle 3.

[0081] Optimally, the mobile actuator 5 includes: a cylinder;

[0082] The output end of the cylinder is connected to the inner valve needle 3 or the outer valve needle 2.

[0083] The cylinder is the optimal embodiment of the moving actuator 5 in this solution. The cylinder has two output states: an extended state and a retracted state. This perfectly satisfies the adjustment of the inner valve needle 3 to the first or second moving state, or the adjustment of the outer valve needle 2 to the first or second moving state. Only two cylinders are needed to control the output of material A or material B of the dual-valve needle nozzle structure. At the same time, the cylinder has a fast response speed and a fast switching between the first and second moving states, which further reduces the switching time and avoids material residue during the switching period.

[0084] The use of an injection molding device in the preparation of composite bottles, wherein the injection molding device is one of the injection molding devices in any of the above embodiments;

[0085] The combined bottle comprises: an outer layer and an inner layer; the inner layer is located between the outer sidewall and the inner sidewall of the outer layer, or the inner layer is located on the inner sidewall of the outer layer; the outer layer is formed from material A; the inner layer is formed from material B;

[0086] Material A is input to the input terminal of the main material cavity 11; material B is input to the input terminal of the auxiliary material cavity 12.

[0087] This solution describes a composite bottle, which is a bottle formed from at least two layers of different raw materials. The composite bottle mainly has two layers: an outer layer and an inner layer. The inner layer can be formed on the inner wall of the outer layer, or in the interlayer between the outer and inner walls, depending on the required process. For example, in an environmentally friendly bottle, the outer layer can be made from the highest-performance material A, while the inner layer, surrounded by the outer layer, can be made from a cheaper material B, thus saving on production costs. Similarly, in a gradient bottle, the inner layer can be formed on the inner wall of the outer layer. Material B is the main material, and colorants are added to material A. By controlling the output pressure of material A, material A is gradually distributed on the outer surface of the inner layer, thus forming a gradient bottle. It should be noted that the above examples are only for illustrating that the injection molding device can be applied to the molding process of composite bottles. The actual molding process can be adjusted according to the sequence of steps, raw materials, parameters, etc., as needed.

[0088] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A dual-valve needle nozzle structure, characterized in that, include: Nozzle body, outer valve needle and inner valve needle; The nozzle body has a main material cavity inside, and the main material cavity has a secondary material cavity inside; the outlet of the secondary material cavity is linearly close to and connected to the nozzle outlet of the main material cavity. The outer valve needle is limited to move within the auxiliary material cavity; in the first moving state, the end of the outer valve needle moves toward the nozzle output port, and the outer side wall of the outer valve needle abuts against the nozzle output port to isolate the main material cavity from the nozzle output port. In the second moving state, the end of the outer valve needle moves away from the nozzle output port, and the outer valve needle disengages from the nozzle output port, so that the main material inner cavity communicates with the nozzle output port; The outer valve needle is provided with a needle cavity, and the needle cavity is provided with a needle outlet at one end facing the outlet of the cavity. The side wall of the needle cavity is provided with a secondary material passage hole, which connects the needle cavity and the secondary material cavity. The inner valve needle is limited to move within the needle cavity; in the first moving state, the end of the inner valve needle moves toward the needle output port, and the inner valve needle moves to block the auxiliary material passage hole through the outer wall, so that the auxiliary material cavity is isolated from the nozzle output port; in the second moving state, the end of the inner valve needle moves away from the needle output port, and the outer wall of the inner valve needle disengages from the auxiliary material passage hole, so that the auxiliary material cavity is connected to the nozzle output port.

2. The dual-valve needle nozzle structure according to claim 1, characterized in that, The nozzle outlet, from the inside out, includes: a cutting cylindrical portion and a narrowing portion; The cut cylindrical portion is cylindrical; the inner diameter of the narrowed portion gradually decreases from the inside to the outside, so that the inner wall of the narrowed portion forms a beveled end face; The outer side of the outer valve needle is provided with an outer conical end face at the end, and the outer diameter of the outer conical end face gradually increases towards the nozzle output port; The outer conical end face and the outer side of the outer valve needle sequentially enter the nozzle output port; the outer side of the outer valve needle is aligned with the cutting cylindrical portion; the outer side of the outer valve needle moves against the inner wall of the cutting cylindrical portion, and the two cut the material at the nozzle output port during relative movement; the outer conical end face abuts against the inner side wall of the narrowing portion.

3. The dual-valve needle nozzle structure according to claim 2, characterized in that, The inner diameter of the inner cavity outlet gradually decreases from the direction of the nozzle outlet; When the outer valve needle reaches the end point of its first moving state, the auxiliary material moves through the hole to abut or approach the smallest inner diameter of the inner cavity outlet. When the outer valve needle reaches the end of its second moving state, the auxiliary material moves through the hole to a position close to the maximum inner diameter of the inner cavity output port.

4. The dual-valve needle nozzle structure according to claim 3, characterized in that, When the inner valve needle reaches the end of its movement in the second moving state, the end of the inner valve needle is aligned with or close to the auxiliary material passage hole.

5. The dual-valve needle nozzle structure according to claim 4, characterized in that, The auxiliary material is disposed on two opposing sidewalls of the needle cavity through the hole; the auxiliary material through the hole is inclined toward the needle output port, so that the inner sidewall of the auxiliary material through the hole furthest from the needle output port forms an inclined guide wall; The end of the inner valve needle is an end plane; when the inner valve needle reaches the end point of its second moving state, the end plane is horizontally aligned with the inclined guide wall.

6. The dual-valve needle nozzle structure according to claim 1, characterized in that, Also includes: Injection molding pressurization device; One of the injection molding pressurizing devices is connected to the main material cavity and is used to control the pressure inside the main material cavity; One of the injection molding pressurizing devices is connected to the inner cavity of the auxiliary material and is used to control the pressure inside the inner cavity of the auxiliary material.

7. A dual-valve needle nozzle structure according to any one of claims 1-6, characterized in that, The outer wall of the auxiliary material cavity is attached to the inner wall of the main material cavity. The outer wall of the auxiliary material cavity is provided with a spiral groove along its length. The spiral groove and the inner wall of the main material cavity form a material conveying channel. The end of the material conveying channel is connected to the nozzle output port.

8. An injection molding device, characterized in that, include: The mobile actuator and a dual-valve needle nozzle structure as described in any one of claims 1-7; The output of a portion of the moving driver is connected to the outer valve needle, which is used to drive the outer valve needle to move within the inner cavity of the auxiliary material, so that the outer valve needle is adjusted to a first moving state or a second moving state. The output of a portion of the moving driver is connected to the inner valve needle, and is used to drive the inner valve needle to move within the needle cavity, so that the inner valve needle is adjusted to a first moving state or a second moving state.

9. An injection molding apparatus according to claim 8, characterized in that, The mobile actuator includes: a cylinder; The output end of the cylinder is connected to the inner valve needle or the outer valve needle.

10. The use of an injection molding apparatus in the preparation of composite bottles, characterized in that, The injection molding device is the injection molding device according to claim 8; The combined bottle comprises: an outer layer and an inner layer; the inner layer is located between the outer sidewall and the inner sidewall of the outer layer, or the inner layer is located on the inner sidewall of the outer layer; the outer layer is formed from material A; the inner layer is formed from material B; Material A is input into the input terminal of the main material cavity; material B is input into the input terminal of the auxiliary material cavity.

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