Leakage-proof injection molding machine nozzle

Abstract

The present invention relates to a leakage-proof injection molding machine nozzle, comprising a nozzle body and a blocking needle, wherein the nozzle body is provided with a rubber flow channel connected to a lower end discharge port, and a blocking needle hole, wherein the lower end of the blocking needle hole is connected to the rubber flow channel, wherein the blocking needle is arranged in the blocking needle hole and can move up and down, wherein a circle of a first blocking surface and a circle of a second blocking surface are arranged above the discharge port in the rubber flow channel, and the first blocking surface is located above the second blocking surface, wherein a circle of a third blocking surface and a circle of a fourth blocking surface are arranged on the outer peripheral surface of the blocking needle, and the third blocking surface is located above the fourth blocking surface; when the blocking needle moves downward, the first blocking surface and the third blocking surface are tightly attached to form a first blocking structure, and at the same time, the second blocking surface and the fourth blocking surface are tightly attached to form a second blocking structure. The injection molding machine nozzle of the present invention can effectively prevent leakage from occurring at the discharge port when injection molding stops through two blocking structures, thereby ensuring the quality of nozzle use.

Description

Technical Field

[0001] The invention relates to the field of injection molding spraying, and in particular to a leakage-proof injection molding machine nozzle. Background Art

[0002] The injection molding machine nozzle is an intermediate structure used to introduce the molten plastic in the barrel into the mold. One end of the nozzle is in contact with the entrance of the main channel of the mold. The molten material in the barrel is injected into the mold through the nozzle under the action of pressure.

[0003] See attached Figure 1 To Attachment Figure 4 As shown, in the existing injection molding machine nozzle, the nozzle body 1 has a discharge port 12 at the lower end, and the nozzle body 1 has a rubber flow channel 11 and a needle blocking hole 13 inside. The pull rod 3 is swung up and down to drive the blocking needle 2 to move up and down in the needle blocking hole 13. The lower end of the needle blocking hole 13 is connected to the rubber flow channel 11, and the blocking needle 2 can be lowered into the rubber flow channel 11 and block the discharge port 12. During injection molding, the blocking needle 2 is driven to rise by the pull rod 3, and the injection molding rubber flows down through the rubber flow channel 11 to be ejected from the discharge port 12 to the mold. After the injection molding is completed, the pull rod 3 is pushed upward to drive the blocking needle 2 to descend to block the discharge port 12 to prevent the rubber from overflowing from the discharge port 12.

[0004] The existing injection molding machine nozzle has the following problems: (1) The lower end of the blocking needle 2 and the rubber flow channel 11 only have a blocking structure at the discharge port 12. As the injection molding machine nozzle is used for a longer time, the molten material causes wear on the blocking structure, and the blocking performance will gradually decrease. It cannot effectively block the discharge port 12 of the nozzle, causing leakage. (2) When the blocking needle 2 moves up and down in the blocking needle hole 13, there is a gap between the two. During injection molding, the internal cavity pressure will cause the rubber to overflow along the gap between the blocking needle 2 and the blocking needle hole 13 to between the blocking needle 2 and the pull rod 3. After a long period of accumulation, the blocking needle 2 will be unable to move up and down. The blocking needle 2 cannot block the discharge port 12 of the nozzle, which will cause nozzle leakage. The rubber retained in the inner cavity continues to leak out, causing waste and pollution, or blocking the flow channel in the mold and damaging the mold. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a leakage-proof injection molding machine nozzle, which can effectively prevent leakage from the discharge port when injection molding is stopped, thereby ensuring the quality of nozzle use.

[0006] To achieve the above-mentioned purpose, the present invention provides a leakage-proof injection molding machine nozzle, comprising a nozzle body and a blocking needle, wherein the nozzle body is provided with a rubber flow channel connected to a lower end discharge port, and a blocking needle hole, the lower end of the blocking needle hole is connected to the rubber flow channel, the blocking needle is arranged in the blocking needle hole and can move up and down, a circle of first blocking surface and a circle of second blocking surface are provided above the discharge port in the rubber flow channel, and the first blocking surface is located above the second blocking surface, a circle of third blocking surface and a circle of fourth blocking surface are provided on the outer peripheral surface of the blocking needle, and the third blocking surface is located above the fourth blocking surface; when the blocking needle moves downward, the first blocking surface and the third blocking surface are tightly attached to form a first blocking structure, and at the same time, the second blocking surface and the fourth blocking surface are tightly attached to form a second blocking structure.

[0007] Furthermore, the first blocking surface is a circle of vertical surfaces, and the third blocking surface is a circle of inclined surfaces.

[0008] Furthermore, the second blocking surface is a circle of inclined surface, and the lower end is connected to the discharge port, and the fourth blocking surface is also a circle of inclined surface, and the inclination angle is different from that of the second blocking surface.

[0009] Furthermore, the nozzle body is provided with a fifth blocking surface at the lower end of the blocking needle hole along the circumference of the blocking needle hole, and the middle part of the blocking needle has a sixth blocking surface around the circumference of the rod body. When the blocking needle rises, the fifth blocking surface is in close contact with the sixth blocking surface to form an upper blocking structure.

[0010] Furthermore, the blocking needle has a truncated cone portion with a tapered surface facing downward in the middle, and the sixth blocking surface is arranged at the upper end of the truncated cone portion.

[0011] Furthermore, the fifth sealing surface and the sixth sealing surface are both in an annular shape.

[0012] Furthermore, the nozzle body is provided with a circle of annular groove on the outer side of the fifth sealing surface, and the outer edge of the sixth sealing surface is located in the annular groove.

[0013] Furthermore, a pull rod which can rotate up and down is provided in the nozzle body, and the pull rod is connected to the upper end of the blocking needle.

[0014] As described above, the injection molding machine nozzle according to the present invention has the following beneficial effects:

[0015] By setting the first and third plugging surfaces that match each other, and the second and fourth plugging surfaces that match each other, tightly together, when the injection molding is in progress, the plugging needle rises, the first and third plugging surfaces are separated, the second and fourth plugging surfaces are separated, and the molten rubber flows from the rubber flow channel to the discharge port and then sprays out. After the injection molding is completed, the plugging needle moves downward, the first and third plugging surfaces are tightly attached to form a first plugging structure to block the molten rubber, and at the same time, the second and fourth plugging surfaces are tightly attached to form a second plugging structure to block the molten rubber again, thereby preventing the stored material from overflowing from the discharge port and effectively separating the molten rubber from the injection mold. Moreover, if the second plugging structure is not tightly sealed due to wear, only a small amount of material leakage will occur. The injection molding machine nozzle of the present invention can effectively prevent material leakage from the discharge port when the injection molding stops through the above-mentioned two plugging structures, thereby ensuring the quality of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the internal structure of the injection molding machine nozzle in the existing design.

[0017] Figure 2 This is a schematic diagram of the internal structure of the injection molding machine nozzle in the existing design, which is a half-section view from another angle.

[0018] Figure 3 for Figure 1 Enlarged view of circle A in .

[0019] Figure 4 This is a schematic diagram of a blocking needle blocking the discharge port in an existing design.

[0020] Figure 5 It is a schematic diagram of the internal structure of the injection molding machine nozzle of the present invention when the injection molding is in progress.

[0021] Figure 6 for Figure 5 Enlarged view of circle B in .

[0022] Figure 7 for Figure 5 Enlarged view of circle C in .

[0023] Figure 8 It is a schematic diagram of the internal structure of the injection molding machine nozzle of the present invention when the injection molding is stopped.

[0024] Fig. 9 for Figure 8 Enlarged view of circle D in .

[0025] Fig.10 for Figure 8 Enlarged view of circle E in .

[0026] Fig.11This is a schematic diagram of the internal structure of the injection molding machine nozzle of the present invention, which is a half-section view from another angle.

[0027] Component number description

[0028] 1 Nozzle body

[0029] 11 Rubber flow channel

[0030] 12 Discharge port

[0031] 13. Blocking the pinhole

[0032] 14 Second sealing surface

[0033] 15 First sealing surface

[0034] 16 Fifth sealing surface

[0035] 17 Annular groove

[0036] 2 Blocking needle

[0037] 21 Fourth sealing surface

[0038] 22 Third sealing surface

[0039] 23 Sixth sealing surface

[0040] 24 Cone

[0041] 3 Tie rod DETAILED DESCRIPTION

[0042] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0043] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0044] See also Figures 5 to 11The present invention provides a nozzle for an injection molding machine that prevents leakage of materials, including a nozzle body 1 and a blocking needle 2. The nozzle body 1 is provided with a rubber flow channel 11 connected to a lower end discharge port 12, and a blocking needle hole 13. The lower end of the blocking needle hole 13 is connected to the rubber flow channel 11. The blocking needle 2 is arranged in the blocking needle hole 13 and can move up and down. When the blocking needle 2 moves downward, its lower end can extend into the rubber flow channel 11 and reach the discharge port 12. A circle of first blocking is provided in the rubber flow channel 11 above the discharge port 12. A circle of third sealing surface 22 and a circle of fourth sealing surface 21 are arranged on the outer circumference of the blocking needle 2, and the third sealing surface 22 is located above the fourth sealing surface 21; when the blocking needle 2 moves downward, the first sealing surface 15 and the third sealing surface 22 are tightly attached to form a first sealing structure, and at the same time, the second sealing surface 14 and the fourth sealing surface 21 are tightly attached to form a second sealing structure.

[0045] The main working principle of the injection molding machine nozzle of the present invention is: when the injection molding work is carried out, refer to Figure 5 and Figure 6 , the blocking needle 2 rises, the first blocking surface 15 separates from the third blocking surface 22, the second blocking surface 14 separates from the fourth blocking surface 21, and the molten rubber flows from the rubber flow channel 11 to the discharge port 12 and then sprays out into the mold. Figure 8 and Fig. 9 , the pressure in the nozzle is eliminated, the blocking needle 2 moves downward, the first blocking surface 15 and the third blocking surface 22 are tightly attached to form a first blocking structure to block the molten rubber material, and at the same time, the second blocking surface 14 and the fourth blocking surface 21 are tightly attached to form a second blocking structure to block the molten rubber material again, thereby preventing the stored material from overflowing from the discharge port 12, and effectively separating the molten rubber material from the injection mold. In addition, the molten rubber material retained between the first blocking structure and the second blocking structure loses pressure support. If the second blocking structure is not sealed tightly due to wear, only a small amount of material leakage occurs. The injection molding machine nozzle of the present invention, by providing the above-mentioned two blocking structures, can effectively prevent leakage from the discharge port 12 when injection molding stops, thereby ensuring the quality of nozzle use.

[0046] In the present application, the first sealing surface 15 and the third sealing surface 22, as well as the second sealing surface 14 and the fourth sealing surface 21, can be in surface contact or line contact, as long as the sealing function is ensured.

[0047] See also Figures 3 to 11 The present invention will be further described below with reference to a specific embodiment.

[0048] See also Figure 6 and Fig. 9In this embodiment, the first blocking surface 15 is a circle of vertical surfaces, the third blocking surface 22 is a circle of inclined surfaces, and the second blocking surface 14 and the first blocking surface 15 can form a linear contact. Under a certain pressure, the contact between the second blocking surface 14 and the first blocking surface is closer. Of course, the first blocking surface can also be a circle of inclined surfaces. Similarly, the second blocking surface 14 is a circle of inclined surfaces, and its lower end is connected to the discharge port 12. The fourth blocking surface 21 is also a circle of inclined surfaces, and the inclination angle is different from that of the second blocking surface 14, so that a linear contact is formed between the second blocking surface 14 and the fourth blocking surface 21 to ensure the blocking effect. Of course, in the present application, the first blocking surface 15 and the third blocking surface 22, as well as the second blocking surface 14 and the fourth blocking surface 21 are not limited to the above-mentioned specific structural forms, and other reasonable structures can also be adopted, as long as the above-mentioned functions can be achieved without affecting the flow of the rubber.

[0049] In this embodiment, as a preferred design, see Figure 7 and Fig.10 The nozzle body 1 is provided with a fifth blocking surface 16 at the lower end of the blocking needle hole 13 along the circumference of the blocking needle hole 13, and the middle part of the blocking needle 2 is provided with a sixth blocking surface 23 around the circumference of the rod body. When the blocking needle 2 rises, the fifth blocking surface 16 and the sixth blocking surface 23 are in close contact with each other to form an upper blocking structure. During the injection molding, the blocking needle 2 rises, and the rubber flows from the rubber flow channel 11 to the discharge port 12 and then sprays out and is injected into the mold. At this time, the sixth blocking surface 23 and the fifth blocking surface 16 are in close contact and cooperate with each other to form a sealing surface, so that the rubber in the rubber flow channel 11 cannot enter the blocking needle hole 13, effectively preventing the phenomenon of overflowing into the blocking needle hole 13 during the injection molding, thereby avoiding the phenomenon that the blocking needle 13 cannot smoothly descend and block the discharge port 12.

[0050] As a preferred design, see Figure 5 , Figure 7 and Fig.10 In the present embodiment, the middle part of the blocking needle 2 has a frustum portion 24 with a tapered surface facing downward, and the middle part of the blocking needle 2 is in a step shape. The sixth blocking surface 23 is arranged at the upper end of the frustum portion 24. When the injection molding is carried out, the pressure in the inner cavity of the nozzle will act on the conical surface of the frustum portion 24, so that the sixth blocking surface 23 and the fifth blocking surface 16 can be further approached to ensure the sealing effect.

[0051] As a preferred design, in this embodiment, see Figure 5 and Fig.10 The fifth sealing surface 16 and the sixth sealing surface 23 are both annular, and, see Figure 4 and Figure 5A circle of annular groove 17 is provided on the outer side of the fifth sealing surface 16, and the outer edge of the sixth sealing surface 23 is located in the annular groove 17, so that the contact area between the fifth sealing surface 16 and the sixth sealing surface 23 can be minimized by the annular groove 17. When a certain pressure is applied to the blocking needle 2, the pressure between the fifth sealing surface 16 and the sixth sealing surface 23 is greater, the contact is tighter, and the sealing effect is better.

[0052] In this embodiment, see Figure 6 A pull rod 3 which can rotate up and down is provided in the nozzle body 1. The pull rod 3 is connected to the upper end of the blocking needle 2. By moving the pull rod 3 up and down, the blocking needle 2 is controlled to move up and down.

[0053] As can be seen from the above, the injection molding machine nozzle in this embodiment, through the first blocking structure and the second blocking structure, enables the blocking needle 2 to effectively block the discharge port 12, thereby preventing leakage from the discharge port when the injection molding stops. At the same time, through the upper blocking structure, it can effectively prevent the phenomenon of overflow into the blocking needle hole 13 during injection molding, thereby avoiding the phenomenon that the blocking needle 13 cannot smoothly descend to block the discharge port 12. The problem of nozzle leakage in the existing design is solved from two aspects, ensuring the quality of nozzle use, and the structure is simple, and the operation is stable and reliable.

[0054] In summary, the invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A nozzle for an injection molding machine for preventing leakage of materials, comprising a nozzle body (1) and a blocking needle (2), wherein the nozzle body (1) is provided with a rubber flow channel (11) connected to a material outlet (12) at the lower end, and a blocking needle hole (13), wherein the lower end of the blocking needle hole (13) is connected to the rubber flow channel (11), and the blocking needle (2) is arranged in the blocking needle hole (13) and can move up and down, characterized in that: A circle of first blocking surface (15) and a circle of second blocking surface (14) are provided in the rubber material flow channel (11) above the material outlet (12), and the first blocking surface (15) is located above the second blocking surface (14); a circle of third blocking surface (22) and a circle of fourth blocking surface (21) are provided on the outer peripheral surface of the blocking needle (2), and the third blocking surface (22) is located above the fourth blocking surface (21); when the blocking needle (2) moves downward, the first blocking surface (15) and the third blocking surface (22) are in close contact with each other to form a first blocking structure, and at the same time, the second blocking surface (14) and the fourth blocking surface (21) are in close contact with each other to form a second blocking structure; the nozzle body (1) is at the lower end of the blocking needle hole (13) A fifth blocking surface (16) is provided along the circumference of the blocking needle hole (13); the middle part of the blocking needle (2) has a sixth blocking surface (23) which is around the circumference of the rod body; when the blocking needle (2) rises, the fifth blocking surface (16) and the sixth blocking surface (23) are in close contact with each other to form an upper blocking structure; the middle part of the blocking needle (2) has a truncated cone portion (24) with a conical surface facing downwards; the sixth blocking surface (23) is provided at the upper end of the truncated cone portion (24); the fifth blocking surface (16) and the sixth blocking surface (23) are both in an annular shape; the nozzle body (1) has a circle of annular grooves (17) on the outer side of the fifth blocking surface (16), and the outer edge of the sixth blocking surface (23) is located in the annular groove (17).

2. The injection molding machine nozzle according to claim 1, characterized in that: The first blocking surface (15) is a circle of vertical surfaces, and the third blocking surface (22) is a circle of inclined surfaces.

3. The injection molding machine nozzle according to claim 1, characterized in that: The second blocking surface (14) is a circle of inclined surface, and the lower end is connected to the discharge port (12). The fourth blocking surface (21) is also a circle of inclined surface, and the inclination angle is different from that of the second blocking surface (14).

4. The injection molding machine nozzle according to claim 1, characterized in that: A pull rod (3) which can rotate up and down is provided in the nozzle body (1), and the pull rod (3) is connected to the upper end of the blocking needle (2).

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