A four-piece self-sealing screw head assembly

Abstract

The present invention discloses a four-piece self-sealing screw head assembly, which includes a screw head, a check ring 1, a check ring 2 and a meson, wherein the check ring 1, the check ring 2 and the meson are sequentially sleeved on the screw head, the front end of the screw head is an arrow-shaped wing, the check ring 1 is a circular ring, and has two grooves on the circular ring, the arrow-shaped wings at the front end of the screw head are respectively sleeved in the two grooves of the check ring 1, the bottom edges of the two grooves of the check ring 1 both include a flat part and an inclined part, the check ring 2 is installed at the rear end of the check ring 1, the middle part of the screw head has a boss, and the meson is installed behind the boss. The four-piece self-sealing screw head assembly of the present invention can cooperate with the function of the injection molding machine to automatically seal the glue, thereby achieving the purpose of reducing the backflow of molten plastic, and then making the weight and density of the plastic injected into the mold the same, the size and weight of the precision injection molded product are stable, and the quality of the precision plastic products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machine nozzles, in particular to a four-piece self-sealing screw head assembly. Background Art

[0002] At present, the standard screw head group adopts a three-piece design, which uses the inertia of injection to seal the check ring and the end face of the screw to prevent the plastic from flowing back. In this very short time, the molten plastic will flow back, causing dimensional deviation of the injection molded product.

[0003] Therefore, in order to overcome the defects of the prior art and solve the above functions, a four-piece self-sealing screw head group has been developed to automatically seal the glue in conjunction with the function of the injection molding machine, thereby reducing the backflow of molten plastic and improving the quality of precision plastic products. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art. The present invention provides a four-piece self-sealing screw head group which can reduce the backflow of molten plastic and improve the stability and precision of precision injection molded products.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A four-piece self-sealing screw head assembly, comprising a screw head, a check ring 1, a check ring 2 and a meson, wherein the check ring 1, the check ring 2 and the meson are sequentially sleeved on the screw head, the front end of the screw head is an arrow-shaped wing, the check ring 1 is a circular ring with two grooves, the arrow-shaped wings at the front end of the screw head are respectively sleeved in the two grooves of the check ring 1, the bottom edges of the two grooves of the check ring 1 both include a flat portion and a sloped portion, the check ring 2 is installed at the rear end of the check ring 1, the middle part of the screw head has a boss, and the meson is installed behind the boss.

[0007] Furthermore, the bottom edge of the groove is transitioned from a plane portion to a plane portion through an inclined slope portion, and the wing can rotate along the bottom edge of the groove.

[0008] Furthermore, the second anti-return ring is cylindrical, the meson is a truncated cone, and the rear end of the second anti-return ring has a concave portion matching the truncated cone of the meson.

[0009] Furthermore, the aperture of the meson is smaller than the outer diameter of the boss.

[0010] Furthermore, when the wing at the front end of the screw head rotates clockwise in the groove of the check ring 1, a gap is generated between the check ring 1 and the check ring 2, and when the screw head rotates counterclockwise, a seal is generated between the check ring 1 and the check ring 2.

[0011] Furthermore, the outer diameter of the check ring 1 is 10 mm to 400 mm.

[0012] The beneficial effects of the present invention are as follows: through the four-piece self-sealing screw head assembly of the present invention, the function of the injection molding machine can be cooperated to automatically seal the glue, thereby achieving the purpose of reducing the backflow of molten plastic, and then making the weight and density of the plastic injected into the mold the same, the size and weight of the precision injection molded product are stable, and the quality of the precision plastic product is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the exploded structure of the self-sealing screw head group in the present invention.

[0014] Figure 2 It is a structural cross-sectional view of the self-sealing screw head assembly in the present invention.

[0015] Figure 3 It is a structural cross-sectional view of the reverse ring one of the present invention.

[0016] Figure 4 It is a structural cross-sectional view of the second reverse ring of the present invention.

[0017] Figure 5 It is a top view of the structure of the meson of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figures 1 to 5As shown, it shows the specific structure of a four-piece self-sealing screw head group, which includes a screw head 1, a check ring 2, a check ring 3 and a meson 4, wherein the check ring 2, the check ring 3 and the meson 4 are sequentially sleeved on the screw head 1, the front end of the screw head 1 is an arrow-shaped wing 5, the check ring 2 is a circular ring, and has two grooves defined by two protrusions 6 on the circular ring, the arrow-shaped wings 5 ​​at the front end of the screw head 1 are respectively sleeved in the two grooves of the check ring 2, the bottom edges of the two grooves of the check ring 2 include a flat part 8 and a flat part 10, and a slope part 7, the check ring 2 3 is installed at the rear end of the check ring 2, the middle part of the screw head 1 has a boss 9, and the meson 4 is installed behind the boss 9.

[0020] The bottom edge of the groove is transitioned from the plane portion 8 to the plane portion 10 through the inclined slope portion 7, and the wing 5 can rotate along the bottom edge of the groove. The check ring 2 3 is cylindrical, and the meson 4 is a truncated cone. The rear end of the check ring 2 3 has a concave portion 11 that matches the truncated cone inclination angle 12 of the meson. The aperture of the meson 4 is smaller than the outer diameter of the boss 9.

[0021] When the wing 5 at the front end of the screw head 1 rotates clockwise in the groove of the check ring 2, since the wing 5 of the screw head descends from the plane part 8 to the plane part 10 through the inclined part 7, a gap will be generated between the check ring 2 and the check ring 2 3. When the screw head 1 rotates counterclockwise, since the wing 5 of the screw head 1 rises from the lower plane part 10 to the plane part 8 through the inclined part 7, the screw head 1 will retreat, making the check ring 2 and the check ring 2 seal and cooperate, thereby generating a seal between the check ring 2 and the check ring 2 3.

[0022] The outer diameter of the check ring 2 is 10 mm to 400 mm.

[0023] The working principle of the present invention is as follows: when the screw head 1 of the machine rotates counterclockwise to start storing material, the low-level plane part in the groove of the check ring 2 in the four-piece type contacts with the wing 5 of the screw head 1, and a natural gap is formed between the check ring 2 and the check ring 3, so that a gap is also generated between the check ring 2 and the meson 4, and the molten plastic flows to the front end of the screw head 1 through this gap. After completing the entire material storage stroke, the screw head 1 needs to reverse half a circle clockwise. At this time, the high-level plane part in the groove of the check ring 2 in the four-piece type contacts with the wing 5 of the screw head 1. At this time, the check ring 2 and the check ring 2 are completely sealed, and the check ring 2 and the meson 4 are also sealed, ensuring that the plastic will not flow back from the four-piece screw head group when the injection action starts, thereby making the weight and density of the plastic injected into the mold the same, and the size and weight of the precision injection molded product are stable. Under the condition of mold guarantee, the dimensional tolerance can be controlled within 0.002mm. The traditional three-piece set relies entirely on the inertia of injection to return the check ring to contact the meson plane for sealing. During the movement of the check ring, plastic backflow will occur, resulting in instability of the injection molded product.

[0024] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A four-piece self-sealing screw head assembly, characterized in that: It comprises a screw head, a first non-return ring, a second non-return ring and a meson, wherein the first non-return ring, the second non-return ring and the meson are sequentially sleeved on the screw head, the front end of the screw head is an arrow-shaped wing, the first non-return ring is a circular ring, and has two grooves on the circular ring, the arrow-shaped wings at the front end of the screw head are respectively sleeved in the two grooves of the first non-return ring, the bottom edges of the two grooves of the first non-return ring both include a flat part and an inclined part, the second non-return ring is installed at the rear end of the first non-return ring, the middle part of the screw head has a boss, and the meson is installed behind the boss; Wherein, the bottom edge of the groove is transitioned from a plane portion to a plane portion through an inclined slope portion, and the wing can rotate along the bottom edge of the groove; When the wing at the front end of the screw head rotates clockwise in the groove of the first check ring, a gap is generated between the first check ring and the second check ring, and when the screw head rotates counterclockwise, a seal is generated between the first check ring and the second check ring; The meson is a truncated cone, and the rear end of the second anti-return ring has a concave portion matching the truncated cone of the meson; The aperture of the meson is smaller than the outer diameter of the boss.

2. The self-sealing screw head assembly according to claim 1, characterized in that: The outer diameter of the check ring 1 is 10 mm to 400 mm.

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