Glue inlet structure of hot runner

Abstract

A glue inlet structure of a hot runner comprises a sprue bush and a positioning ring, the sprue bush is positioned by a positioning part of the positioning ring, a heat insulation gap is formed between the positioning part and the sprue bush, a sealing cavity is formed between the positioning ring and the sprue bush, the sealing cavity is communicated with the heat insulation gap, and the sealing cavity is communicated with the heat insulation gap. And molten plastic is prevented from flowing to the outside of the sealing cavity through the heat insulation gap. According to the embodiment, the sealing cavity is formed between the positioning ring and the sprue bush and can seal the heat insulation gap, so that leaked molten plastic is effectively prevented from entering the hot runner through the heat insulation gap, and the use stability of the hot runner is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of injection hot runners, in particular to a glue inlet structure of a hot runner. Background Art

[0002] A hot runner is a heating component system used in an injection mold to inject molten plastic particles into the mold cavity.

[0003] like Fig.11 As shown, the existing hot runner includes a fixed plate Ⅰ1', a positioning ring Ⅰ2' is arranged in the middle of the upper end of the fixed plate Ⅰ1', a sprue sleeve Ⅰ3' is embedded in the positioning ring Ⅰ2', and a sprue sleeve Ⅰ inner hole channel 31' is arranged axially in the sprue sleeve Ⅰ3'; an injection nozzle Ⅰ4' is arranged coaxially with the sprue sleeve Ⅰ3' at the upper end, and an injection nozzle inner hole channel Ⅰ41' is arranged axially in the injection nozzle Ⅰ4', and the injection nozzle Ⅰ4' can move up and down, so as to couple or separate with the sprue sleeve Ⅰ3'. When the injection nozzle Ⅰ4' is coupled with the sprue sleeve Ⅰ3', the injection nozzle inner hole channel Ⅰ41' is connected with the sprue sleeve Ⅰ inner hole channel 31' to form a glue inlet channel, and the glue inlet channel is connected with the main flow channel 100 of the hot runner. Among them, the sprue sleeve Ⅰ3' and the injection nozzle Ⅰ4' are heated to the melting temperature of the plastic by the heating element, while the positioning ring Ⅰ2' is at room temperature. In order to prevent the heat loss of the sprue sleeve Ⅰ3' and the injection nozzle Ⅰ4', an insulating gap Ⅰ5' is provided between the positioning ring Ⅰ2' and the outer wall of the sprue sleeve Ⅰ3', so that no heat conduction occurs between the sprue sleeve Ⅰ3' and the positioning ring Ⅰ2'.

[0004] However, in the manual debugging stage before the continuous production of the injection molding machine, the injection nozzle Ⅰ4' and the gate sleeve Ⅰ3' will be coupled and separated many times, and each coupling will produce a certain degree of impact. After multiple couplings, the sealing surface S between the injection nozzle Ⅰ4' and the gate sleeve Ⅰ3' will be worn or notched, resulting in leakage in the glue inlet channel during the injection molding process; after the leaked molten plastic encounters the positioning ring Ⅰ2', it will theoretically solidify into solid plastic and will not enter the interior of the hot runner through the insulation gap Ⅰ5'. However, in the actual process, since the gate sleeve Ⅰ3' and the injection nozzle Ⅰ4' are continuously heated by the heating element, the leaked molten plastic will remain in a liquid state, thereby entering the interior of the hot runner through the insulation gap Ⅰ5', eventually causing the interior of the hot runner to be filled with plastic, damaging the internal structure of the hot runner, and affecting the normal operation of the hot runner. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a glue inlet structure of a hot runner.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A hot runner glue inlet structure includes a gate sleeve and a positioning ring, the gate sleeve is positioned by a positioning portion of the positioning ring, and an insulating gap is provided between the positioning portion and the gate sleeve. It is characterized in that a sealed cavity is provided between the positioning ring and the gate sleeve, and the sealed cavity is connected to the insulating gap to prevent molten plastic from flowing to the outside of the sealed cavity through the insulating gap.

[0008] In the utility model, a second sealing cavity is further provided between the positioning ring and the sprue bushing, and the second sealing cavity seals the sealing cavity.

[0009] In the utility model, a plurality of third sealing cavities which are sealed in sequence are further arranged between the positioning ring and the sprue bushing, and at least one third sealing cavity seals the second sealing cavity.

[0010] In the utility model, the sprue sleeve is positioned by the positioning hole of the positioning ring, and the heat-insulating gap is provided between the hole wall of the positioning hole and the outer wall of the sprue sleeve;

[0011] The glue inlet structure also includes a sealing gasket, which includes a sleeve inner hole and a sealing inner hole. The sealing inner hole is arranged at the upper end of the sleeve inner hole. The aperture of the sealing inner hole is larger than the aperture of the sleeve inner hole. The sleeve inner hole and the sealing inner hole are connected through the inner hole end surface.

[0012] The sleeve inner hole is sleeved on the outer wall of the gate sleeve, the upper end of the sealing gasket is in contact with the inner top surface of the positioning ring, the inner top surface of the positioning ring is connected to the positioning hole, and the sealing cavity is formed between the sealing gasket, the positioning ring and the gate sleeve.

[0013] In the utility model, a first sealing ring is circumferentially provided on the inner top surface of the positioning ring, the first sealing ring fits the inner hole end surface of the sealing gasket, and the sealing cavity and the second sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

[0014] In the utility model, a plurality of first sealing rings are provided on the inner top surface of the positioning ring along the circumferential direction, and the plurality of first sealing rings are arranged in sequence along the radial direction away from the positioning hole. The plurality of first sealing rings are respectively fitted with the inner hole end surfaces of the sealing gasket, and the sealing cavity, the second sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

[0015] In the utility model, a second sealing ring is circumferentially provided on the inner hole end surface of the sealing gasket, and the second sealing ring is fitted to the inner top surface of the positioning ring. The sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

[0016] In the utility model, a plurality of second sealing rings are circumferentially arranged on the inner hole end face of the sealing gasket, and the plurality of second sealing rings are sequentially arranged radially away from the sleeve inner hole, and the plurality of second sealing rings are respectively attached to the inner top surface of the positioning ring, and the sealing cavity, the second sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

[0017] In the utility model, at least one first sealing ring is circumferentially provided on the inner top surface of the positioning ring, and at least two second sealing rings are circumferentially provided on the inner hole end surface of the sealing gasket, and the first sealing ring and the second sealing ring are alternately arranged along the radial direction away from the gate sleeve, the first sealing ring fits the inner hole end surface of the sealing gasket, and the second sealing ring fits the inner top surface of the positioning ring, and the sealing cavity, the second sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

[0018] In the utility model, at least two first sealing rings are circumferentially provided on the inner top surface of the positioning ring, and at least one second sealing ring is circumferentially provided on the inner hole end surface of the sealing gasket, and the first sealing ring and the second sealing ring are alternately arranged along the radial direction away from the gate sleeve, the first sealing ring fits the inner hole end surface of the sealing gasket, and the second sealing ring fits the inner top surface of the positioning ring, and the sealing cavity, the second sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

[0019] Beneficial effects of the utility model: In this embodiment, a sealed cavity is set between the positioning ring and the gate sleeve, and the sealed cavity can seal the insulation gap, effectively preventing the leakage of molten plastic from entering the hot runner through the insulation gap, thereby ensuring the stability of the hot runner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a structural schematic diagram of Example 1;

[0022] Figure 2 This is a schematic diagram of the structure of the glue inlet structure of Example 2 on the hot runner;

[0023] Figure 3 Schematic diagram of the structure of the glue inlet structure in Example 2;

[0024] Figure 4 Schematic diagram of a conventionally designed gasket;

[0025] Figure 5 Schematic diagram of a gasket designed for a dish shape;

[0026] Figure 6 It is a schematic diagram of a sealing gasket without an inner hole end face;

[0027] Figure 7 Schematic diagram of the structure of the glue inlet in Example 3;

[0028] Figure 8 Schematic diagram of the structure of the glue inlet structure in Example 4;

[0029] Fig. 9 Schematic diagram of the structure of the glue inlet in Example 5;

[0030] Fig.10 Schematic diagram of the structure of the glue inlet structure in Example 6;

[0031] Fig.11 It is a structural schematic diagram of the prior art. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model. Embodiment 1:

[0035] like Figure 1 and Figure 4-6As shown, this embodiment discloses a hot runner glue inlet structure, including a sprue sleeve 3 and a positioning ring 2, the positioning ring 2 is mounted on the fixed plate 1 of the hot runner, the sprue sleeve 3 is provided with a sprue sleeve inner hole channel 31 along the axial direction, the upper end of the sprue sleeve 3 is provided with an injection nozzle 4 coaxial therewith, the injection nozzle 4 is provided with an injection nozzle inner hole channel 41 along the axial direction, and the injection nozzle 4 can move up and down, so as to couple or separate with the sprue sleeve 3. When the injection nozzle 4 is coupled with the sprue sleeve 3, the injection nozzle inner hole channel 41 is connected with the sprue sleeve inner hole channel 31 to form a glue inlet channel, and the glue inlet channel is connected with the main flow channel of the hot runner, so that the molten plastic can flow into the main flow channel of the hot runner, and then flow to each mold cavity through the branch flow channel of the hot runner to achieve injection molding.

[0036] Furthermore, the gate sleeve 3 is positioned by the positioning part of the positioning ring 2, and an insulating gap 5 is provided between the positioning part and the gate sleeve 3. A sealed cavity 7 is provided between the positioning ring 2 and the gate sleeve 3, and the sealed cavity 7 is communicated with the insulating gap 5 to prevent the molten plastic from flowing through the insulating gap 5 to the outside of the sealed cavity 7.

[0037] In this embodiment, the middle portion of the positioning portion of the positioning ring 2 is a positioning hole 210 extending axially along the positioning ring 2, the sprue bushing 3 is positioned by the positioning hole 210 of the positioning ring 2, and the thermal insulation gap 5 is provided between the hole wall of the positioning hole 210 and the outer wall of the sprue bushing 3;

[0038] Furthermore, the glue inlet structure also includes a sealing gasket 6, which includes a sleeve inner hole 61 and a sealing inner hole 62. The sealing inner hole 62 is arranged at the upper end of the sleeve inner hole 61, and the aperture of the sealing inner hole 62 is larger than the aperture of the sleeve inner hole 61. The sleeve inner hole 61 and the sealing inner hole 62 are connected via an inner hole end face 63; the sleeve inner hole 61 is sleeved on the outer wall of the gate sleeve 3, and the upper end of the sealing gasket 6 is in contact with the inner top surface of the positioning ring 2, and the inner top surface of the positioning ring 2 is connected to the positioning hole 210, and the sealing cavity 7 is formed between the sealing gasket 6, the positioning ring 2 and the gate sleeve 3.

[0039] Specifically, the sleeve inner hole 61 is a circular inner hole, and the sealing inner hole 62 is a circular inner hole or a truncated cone inner hole. The diameter of the sealing inner hole 62 is at least partially larger than the diameter of the sleeve inner hole 61. Specifically, when the sealing inner hole 62 is a circular inner hole, the diameter of the sealing inner hole 62 is larger than the diameter of the sleeve inner hole 61; when the sealing inner hole 62 is a truncated cone inner hole, the minimum diameter of the sealing inner hole 62 is larger than or equal to the diameter of the sleeve inner hole 61, and the maximum diameter is larger than the diameter of the sleeve inner hole 61. More specifically, the sealing gasket 6 can adopt a conventional design or a dish-shaped design; and when the dish-shaped sealing gasket 6 is pressed, the dish-shaped design can produce a larger normal deformation, so that the sealing effect between the end face of the sealing inner hole 62 and the positioning ring 2 is better. The conventional design of the sealing gasket 6 refers to Figure 4 , dish-shaped design gasket 6 Figure 5 In addition, it should be noted that the inner hole end surface 63 is an optional structure, and the inner hole end surface 63 may not be provided in other embodiments, such as Figure 6 shown.

[0040] In this embodiment, a sealing cavity 7 is provided between the positioning ring 2 and the sprue bushing 3. The sealing cavity 7 can seal the thermal insulation gap 5, effectively preventing the leakage of molten plastic from entering the hot runner through the thermal insulation gap 5, thereby ensuring the stability of the hot runner. Embodiment 2:

[0041] like Figure 2-3 As shown, this embodiment is improved on the basis of embodiment 1. In this embodiment, the outer wall of the gate sleeve 3 includes a first step circumferential surface 321 and a first step end surface 322 arranged along the circumferential direction. The first step end surface 322 is arranged at the lower end of the first step circumferential surface 321. The thermal insulation gap 5 is formed between the hole wall of the positioning hole 210 of the positioning ring 2 and the first step circumferential surface 321. The lower end of the sealing gasket 6 is supported by the first step end surface 322, and the upper end of the sealing gasket 6 is pressed by the inner top surface of the positioning ring 2. The sealing cavity 7 is formed between the sealing gasket 6, the inner top surface of the positioning ring 2 and the first step circumferential surface 321.

[0042] After the upper end of the sealing gasket 6 is pressed by the inner top surface of the positioning ring 2, the positioning ring 2 will provide a load to the sealing gasket 6, causing the sealing gasket 6 to generate axial stress, so that the inner top surface of the positioning ring 2 and the upper end surface of the sealing gasket 6 are tightly fitted to form a first sealing surface, and the lower end surface of the sealing gasket 6 is tightly fitted to the first step end surface 322 to form a second sealing surface. This embodiment seals the sealing cavity 7 by adding the first sealing surface and the second sealing surface, thereby increasing the reliability of the sealing of the thermal insulation gap 5. Embodiment 3:

[0043] like Figure 7As shown, this embodiment is improved on the basis of embodiment 2. In this embodiment, the positioning hole 210 of the positioning ring 2 is provided with a second step along the circumferential direction, and the second step includes a second step end face 211 and a second step peripheral surface 212 provided at the upper end of the second step end face 211, and the second step end face 211 is the inner top surface of the positioning ring 2, wherein the upper end face of the sealing gasket 6 is pressed by the second step end face 211, and the outer side face of the sealing gasket 6 is pressed by the second step peripheral surface 212; when the sealing gasket 6 is pressed, the sealing cavity 7 is formed between the sealing gasket 6, the first step peripheral surface 321 and the second step end face 211, the second step end face 211 is tightly fitted to the upper end face of the sealing gasket 6 and forms a first sealing surface, and the lower end face of the sealing gasket 6 is tightly fitted to the first step end face to form a second sealing surface; in addition, the axial stress generated by the pressure on the sealing gasket 6 will cause the sealing gasket 6 to produce a normal deformation, so that the outer side face of the sealing gasket 6 and the second step peripheral surface 212 are tightly fitted to form a third sealing surface.

[0044] In this embodiment, the sealing cavity 7 is sealed simultaneously by the first sealing surface, the second sealing surface and the third sealing surface, thereby further increasing the reliability of the sealing. Embodiment 4:

[0045] like Figure 8 As shown, this embodiment is improved on the basis of embodiment 2 and / or embodiment 3, and the difference is that: in this embodiment, a second sealing cavity 71 is further provided between the positioning ring 2 and the gate sleeve 3, and the second sealing cavity 71 seals the sealing cavity 7. For example, the inner top surface of the positioning ring 2 is circumferentially provided with a first sealing ring 213, and the first sealing ring 213 fits the inner hole end surface 63 of the sealing gasket 6 and forms a fourth sealing surface. The sealing cavity 7 and the second sealing cavity 71 are formed between the sealing gasket 6, the positioning ring 2 and the gate sleeve 3.

[0046] The present embodiment adds a fourth sealing surface and a second sealing cavity 71, wherein the second sealing surface, the fourth sealing surface and the second sealing cavity 71 seal the sealing cavity 7, and the first sealing surface and the third sealing surface seal the second sealing cavity 71, thereby forming a double-cavity sealing design through the second sealing cavity 71 and the sealing cavity 7, further increasing the sealing reliability.

[0047] It should be noted that, in some embodiments, a plurality of first sealing rings 213 may be provided, so as to form multiple groups of fourth sealing surfaces and second sealing cavities 71 to seal the sealing cavity 7, thereby further improving the sealing effect of the thermal insulation gap 5; and a plurality of third sealing cavities 72 that are sealed in sequence may be provided between the positioning ring 2 and the sprue sleeve 3, and at least one third sealing cavity 72 seals the second sealing cavity 71. For example, a plurality of first sealing rings 213 are circumferentially provided on the inner top surface of the positioning ring 2, and the plurality of first sealing rings 213 are sequentially arranged along the radial direction away from the positioning hole 210, and the plurality of first sealing rings 213 are respectively attached to the inner hole end surface 63 of the sealing gasket 6, and the sealing cavity 7, the second sealing cavity 71 and the third sealing cavity 72 are formed between the sealing gasket 6, the positioning ring 2 and the sprue sleeve 3. Embodiment 5:

[0048] like Fig. 9 As shown, this embodiment is improved on the basis of embodiment 3 and / or embodiment 4, and the difference is that: in this embodiment, a plurality of third sealing cavities 72 which are sealed in sequence are further arranged between the positioning ring 2 and the gate sleeve 3, and at least one third sealing cavity 72 seals the second sealing cavity 71. For example, the inner hole end face 63 of the sealing gasket 6 is circumferentially provided with a second sealing ring 631, and the second sealing ring 631 is attached to the inner top surface of the positioning ring 2 and forms a fifth sealing surface, and the sealing cavity 7 and the third sealing cavity 72 are formed between the sealing gasket 6, the positioning ring 2 and the gate sleeve 3.

[0049] It should be noted that, in some embodiments, a plurality of second sealing rings 631 may be provided, so as to form multiple groups of fifth sealing surfaces and third sealing cavities 72 to seal the sealing cavity 7, thereby further improving the sealing effect of the thermal insulation gap 5; for example, the inner hole end face 63 of the sealing gasket 6 is circumferentially provided with a plurality of second sealing rings 631, and the plurality of second sealing rings 631 are sequentially arranged along the radial direction away from the sleeve inner hole 61, and the plurality of second sealing rings 631 are respectively attached to the inner top surface of the positioning ring 2, and at the same time, the sealing cavity 7, the second sealing cavity 71 and the third sealing cavity 72 are formed between the sealing gasket 6, the positioning ring 2 and the gate sleeve 3.

[0050] The present embodiment adds a fifth sealing surface and a third sealing cavity 72, wherein the sealing cavity 7 is sealed by the second sealing surface, the fifth sealing surface and the third sealing cavity 72, and the third sealing cavity 72 is sealed by the first sealing surface and the third sealing surface. In this way, a double-cavity sealing design is formed by the sealing cavity 7 and the third sealing cavity 72, thereby further increasing the sealing reliability. Embodiment 6:

[0051] like Fig.10As shown, this embodiment combines the structures of Embodiment 4 and Embodiment 5. In this embodiment, at least one first sealing ring 213 is circumferentially provided on the inner top surface of the positioning ring 2, and at least two second sealing rings 631 are circumferentially provided on the inner hole end surface 63 of the sealing gasket 6. The first sealing ring 213 and the second sealing ring 631 are alternately arranged in a radial direction away from the gate bushing 3. The first sealing ring 213 fits the inner hole end surface 63 of the sealing gasket 6 and forms a fourth sealing surface. The second sealing ring 631 fits the inner top surface of the positioning ring 2 and forms a fifth sealing surface. The sealing cavity 7, the second sealing cavity 71 and the third sealing cavity 72 are formed between the sealing gasket 6, the positioning ring 2 and the gate bushing 3.

[0052] In this embodiment, the sealing cavity 7 is first sealed by the second sealing surface, the fifth sealing surface and the second cavity 71, and then the second cavity 71 is sealed by the fourth sealing surface and the third sealing cavity 72, and then the third sealing cavity 72 is sealed by the first sealing surface and the third sealing surface, so that the sealing cavity 7, the second cavity 71 and the third sealing cavity 72 form a three-cavity sealing design, further increasing the sealing reliability. In addition, the first sealing ring 213 and the second sealing ring 631 can be provided in plurality, so as to form multiple groups of the fifth sealing surface, the second cavity 71, the fourth sealing surface and the third sealing cavity 72 to seal the sealing cavity 7.

[0053] In addition, in another embodiment, at least two first sealing rings 213 may be provided on the inner top surface of the positioning ring 2 along the circumferential direction, and at least one second sealing ring 631 may be provided on the inner hole end surface 63 of the sealing gasket 6 along the circumferential direction, and the first sealing ring 213 and the second sealing ring 631 may be alternately arranged along the radial direction away from the gate sleeve 3, and the first sealing ring 213 may fit the inner hole end surface 63 of the sealing gasket 6 to form a fourth sealing surface, and the second sealing ring 631 may fit the inner top surface of the positioning ring 2 to form a fifth sealing surface, and the sealing cavity 7, the second sealing cavity 71 and the third sealing cavity 72 may be formed between the sealing gasket 6, the positioning ring 2 and the gate sleeve 3.

[0054] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. A hot runner inlet structure, comprising a sprue bushing and a positioning ring, wherein the sprue bushing is positioned by a positioning portion of the positioning ring, and a heat insulating gap is provided between the positioning portion and the sprue bushing, wherein: A sealed cavity is arranged between the positioning ring and the sprue bushing, and the sealed cavity is communicated with the thermal insulation gap to prevent molten plastic from flowing to the outside of the sealed cavity through the thermal insulation gap.

2. The glue inlet structure according to claim 1, characterized in that: A second sealing cavity is further provided between the positioning ring and the sprue bushing, and the second sealing cavity seals the sealing cavity.

3. The glue inlet structure according to claim 2, characterized in that: A plurality of third sealed cavities which are sealed in sequence are further arranged between the positioning ring and the gate sleeve, and at least one third sealed cavity seals the second sealed cavity.

4. The glue inlet structure according to claim 3, characterized in that: The sprue bushing is positioned by the positioning hole of the positioning ring, and the heat-insulating gap is provided between the hole wall of the positioning hole and the outer wall of the sprue bushing; The glue inlet structure also includes a sealing gasket, which includes a sleeve inner hole and a sealing inner hole. The sealing inner hole is arranged at the upper end of the sleeve inner hole. The aperture of the sealing inner hole is larger than the aperture of the sleeve inner hole. The sleeve inner hole and the sealing inner hole are connected through the inner hole end surface. The sleeve inner hole is sleeved on the outer wall of the gate sleeve, the upper end of the sealing gasket is in contact with the inner top surface of the positioning ring, the inner top surface of the positioning ring is connected to the positioning hole, and the sealing cavity is formed between the sealing gasket, the positioning ring and the gate sleeve.

5. The glue inlet structure according to claim 4, characterized in that: A first sealing ring is circumferentially disposed on the inner top surface of the positioning ring, and the first sealing ring fits the inner hole end surface of the sealing gasket. The sealing cavity and the second sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

6. The glue inlet structure according to claim 4, characterized in that: The inner top surface of the positioning ring is provided with a plurality of first sealing rings along the circumferential direction. The plurality of first sealing rings are arranged in sequence along the radial direction away from the positioning hole. The plurality of first sealing rings are respectively fitted with the inner hole end surfaces of the sealing gasket. The sealing cavity, the second sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

7. The glue inlet structure according to claim 4, characterized in that: The inner hole end surface of the sealing gasket is provided with a second sealing ring along the circumferential direction, and the second sealing ring is in contact with the inner top surface of the positioning ring. The sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

8. The glue inlet structure according to claim 4, characterized in that: The inner hole end surface of the sealing gasket is provided with a plurality of second sealing rings along the circumferential direction, and the plurality of second sealing rings are arranged in sequence along the radial direction away from the sleeve inner hole, and the plurality of second sealing rings are respectively attached to the inner top surface of the positioning ring, and the sealing cavity, the second sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the gate sleeve.

9. The glue inlet structure according to claim 4, characterized in that: At least one first sealing ring is circumferentially provided on the inner top surface of the positioning ring, and at least two second sealing rings are circumferentially provided on the inner hole end surface of the sealing gasket. The first sealing ring and the second sealing ring are alternately arranged in a radial direction away from the sprue bushing. The first sealing ring fits the inner hole end surface of the sealing gasket, and the second sealing ring fits the inner top surface of the positioning ring. The sealing cavity, the second sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the sprue bushing.

10. The glue inlet structure according to claim 4, characterized in that: At least two first sealing rings are circumferentially provided on the inner top surface of the positioning ring, and at least one second sealing ring is circumferentially provided on the inner hole end surface of the sealing gasket. The first sealing rings and the second sealing rings are alternately arranged in a radial direction away from the sprue bushing. The first sealing ring fits the inner hole end surface of the sealing gasket, and the second sealing ring fits the inner top surface of the positioning ring. The sealing cavity, the second sealing cavity and the third sealing cavity are formed between the sealing gasket, the positioning ring and the sprue bushing.

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