High-precision blowing valve of injection mold

Abstract

A high-precision air blowing valve of an injection mold comprises a shell and an inner mold core, an inner convex ring is arranged in the shell, a sealing groove is formed in the shell on one side of the inner convex ring, a guide hole and an air inlet hole are formed in the inner convex ring, the inner mold core is inserted into the guide hole of the shell, and the outer wall of the inner mold core is matched with the inner wall of the guide hole in a sealing mode. A sealing head is arranged at one end of the inner core and matched with the sealing groove, the other end of the sealing head is connected with a nut, the nut is connected with the sealing head through threads, a spring is arranged on the outer wall of the inner core between the nut and the inner protruding ring, corresponding positioning penetrating holes are formed in the nut and the inner core, and positioning pins are arranged in the positioning penetrating holes. And the nut is positioned and matched with the inner core through a positioning pin.

Description

Technical Field

[0001] The utility model relates to an injection mold, in particular to a high-precision air blowing valve of the injection mold. Background Art

[0002] In an injection mold, if the clamping force of the injection-molded plastic part is too large, the ejector or ejector plate will have difficulty ejecting it. Usually, a valve structure is set in the injection mold, and an air pump is used to blow high-pressure air into the mold from the valve. With the assistance of the high-pressure air, the molded plastic part can be demolded. The valves of the existing technology are such as Chinese invention patent 201710623859.1, and the patent name is "Valve Unit and Die-casting Mold". The valve unit includes a valve assembly that can reciprocate along the direction from the plunger to the upper mold, and the valve assembly includes a valve body, and the plunger is provided with a through hole. The valve body is sleeved in the through hole, and the valve body and the through hole gap cooperate to circulate air; the valve assembly further includes an outer convex portion, and the outer convex portion is provided at one end of the valve body facing the material storage cavity, and the through hole is provided with an inner concave portion that can be fitted with the surface of the outer convex portion to close the material storage cavity; the outer convex portion is provided with a power hole that can accommodate the rubber handle to drive the valve body to move toward the material storage cavity and then open the material storage cavity. However, the structure has the following disadvantages: 1. The gap between the valve body and the through hole is coordinated for air circulation, that is, the gap between the valve body and the through hole is large, resulting in inaccurate positioning of the valve body. The valve body is prone to shaking when moving up and down along the through hole, thus affecting its accuracy and air tightness; 2. A retaining ring is installed at the end of the valve body away from the material storage chamber, and the retaining ring is fixed to the end of the valve body away from the material storage chamber by screws, and is only fixed to the valve body by screws and retaining rings. After the valve body works back and forth for a long time, the screws are easy to loosen. Once loosened, it will affect the air tightness and may even cause the screws, springs and other components to fall off, affecting the blowing. Summary of the invention

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a high-precision blowing valve for an injection mold with tight fit, reliable assembly, accurate positioning, high precision, good air tightness and long service life.

[0004] The utility model discloses a technical scheme for a high-precision air blowing valve for an injection mold, which comprises an outer shell and an inner core, wherein an inner convex ring is formed in the outer shell, a sealing groove is formed in the outer shell on one side of the inner convex ring, a guide hole and an air inlet hole are opened in the inner convex ring, the inner core is inserted into the guide hole of the outer shell, an outer wall of the inner core is sealed and matched with an inner wall of the guide hole, a sealing head is formed at one end of the inner core, the sealing head is matched with the sealing groove, a nut is connected to the other end of the sealing head, the nut is connected to the sealing head via threads, a spring is arranged on the outer wall of the inner core between the nut and the inner convex ring, corresponding positioning through holes are formed in the nut and the inner core, positioning pins are arranged in the positioning through holes, and the nut is positioned and matched with the inner core via the positioning pins.

[0005] Furthermore, an inner sealing surface is formed on the inner wall of the sealing groove, and an outer sealing surface is formed on the outer wall of the sealing head, and the outer sealing surface is sealingly matched with the inner sealing surface.

[0006] Furthermore, a gasket is arranged on the outer wall of the inner core, one side of the gasket is in contact with the spring, and the other side of the gasket is in contact with the nut.

[0007] Furthermore, the outer wall of the shell is formed with steps.

[0008] Furthermore, a slot is formed on the step, and when blowing, the positioning pin and the slot are limitedly matched.

[0009] Furthermore, four air inlet holes are formed in the inner convex ring of the outer shell.

[0010] The utility model discloses a high-precision air blowing valve for an injection mold. The utility model mainly comprises an inner convex ring formed in an outer shell, a guide hole and an air inlet hole formed in the inner convex ring, the inner diameter of the guide hole is close to the outer diameter of an inner core, so that the clearance at the fitting position of the guide hole and the inner core is very small. When air is blown, the guide hole can play a good guiding role for the left and right sliding of the inner core, and the inner core will not shake when sliding. Since the inner core and the guide hole are accurately positioned, the outer wall of the sealing head can be made into an outer sealing straight face, and the inner wall of the sealing groove can be made into an inner sealing straight face. No wear will be generated between the two through the straight face matching, and good air tightness can be guaranteed when no air is blown. In addition, corresponding positioning perforations are formed in the nut and the inner core, and positioning pins are arranged in the positioning perforations. The positioning pins can play a positioning role for the nut and the inner core, and the nut will not loosen when the inner core is in long-term reciprocating motion, thereby ensuring reliable assembly of the two and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural schematic diagram of a high-precision air blowing valve for an injection mold of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the shell;

[0013] Figure 3 It is a schematic diagram of the structure of the inner core;

[0014] Figure 4 It is a structural diagram of a nut;

[0015] Figure 5 It is a right side schematic diagram of a high-precision air blowing valve of an injection mold of the utility model;

[0016] Figure 6 It is a side view schematic diagram showing four air inlet holes formed in the inner convex ring of the shell. DETAILED DESCRIPTION

[0017] The utility model relates to a high-precision air blowing valve for an injection mold, such as Figure 1 — Figure 6 As shown, it includes an outer shell 1 and an inner core 2, wherein the outer shell 1 is provided with an inner convex ring 3, a sealing groove 4 is formed in the outer shell 1 on one side of the inner convex ring 3, a guide hole 5 and an air inlet hole 6 are opened in the inner convex ring 3, the inner core 2 is inserted into the guide hole 5 of the outer shell 1, the outer wall of the inner core 2 is sealed with the inner wall of the guide hole 5, a sealing head 7 is provided at one end of the inner core 2, the sealing head 7 is matched with the sealing groove 4, the other end of the sealing head 7 is connected with a nut 8, the nut 8 is threadedly connected to the sealing head 7, a spring 9 is arranged on the outer wall of the inner core 2 between the nut 8 and the inner convex ring 3, corresponding positioning through holes 10 are formed in the nut 8 and the inner core 2, a positioning pin 11 is arranged in the positioning through hole 10, and the nut 8 is positioned and matched with the inner core 2 via the positioning pin 11.

[0018] Furthermore, the inner wall of the sealing groove 4 is formed with an inner sealing surface 12, and the outer wall of the sealing head 7 is formed with an outer sealing surface 13, and the outer sealing surface 13 is sealed with the inner sealing surface 12. When the sealing head 7 is matched with the sealing groove 4, the positioning is more accurate and the matching airtightness is better.

[0019] Furthermore, a gasket 14 is disposed on the outer wall of the inner core 2 , one side of the gasket 14 is in contact with the spring 9 , and the other side of the gasket 14 is in contact with the nut 8 .

[0020] Furthermore, the outer wall of the housing 1 is provided with a step 15. The step 15 serves to limit the entire valve and ensure the reliability of assembly.

[0021] Furthermore, a slot 16 is formed on the step 15, and when blowing, the positioning pin 11 is limitedly matched with the slot 16. When blowing, the air pressure will push the sealing head 7 to move to the left through the air inlet 6, and the sealing head 7 will drive the inner core 2, the gasket 14, the nut 8, and the positioning pin 11 to move to the left together, so that the positioning pin 11 is stuck in the slot 16, and the slot 16 can limit the positioning pin 11, thereby preventing the inner core 2 and the sealing head 7 from rotating.

[0022] Furthermore, four air inlet holes 6 are formed in the inner convex ring 3 of the housing 1 .

[0023] The utility model discloses a high-precision air blowing valve for an injection mold, which is mainly composed of an inner convex ring 3 in a shell 1, a guide hole 5 and an air inlet 6 in the inner convex ring 3, the inner diameter of the guide hole 5 is close to the outer diameter of the inner core 2 (in actual processing, the gap between the two is only 0.03 mm-0.05 mm), so that the gap between the guide hole 5 and the inner core 2 is very small, and when blowing, the guide hole 5 can play a good guiding role in the left and right sliding of the inner core 2, and the inner core 2 will not shake when sliding. Because the inner core 2 and the guide hole 5 are close to each other, the inner core 2 can slide smoothly. The guiding positioning is precise, so the outer wall of the sealing head 7 can be made into an outer sealing surface 13, and the inner wall of the sealing groove 4 can be made into an inner sealing surface 12. The two will not be worn by the surface matching, and good air tightness can be guaranteed when no air is blown. In addition, corresponding positioning holes 10 are made in the nut 8 and the inner core 2, and a positioning pin 11 is arranged in the positioning hole 10. The positioning pin 11 can play a positioning role for the nut 8 and the inner core 2. When the inner core 2 is in long-term reciprocating motion, the nut 8 will not loosen, ensuring that the two are assembled reliably and have a long service life.

Claims

1. A high-precision air blowing valve for an injection mold, characterized in that: The invention comprises an outer shell (1) and an inner core (2), wherein the outer shell (1) is provided with an inner convex ring (3), a sealing groove (4) is formed in the outer shell (1) on one side of the inner convex ring (3), a guide hole (5) and an air inlet hole (6) are opened in the inner convex ring (3), the inner core (2) is inserted into the guide hole (5) of the outer shell (1), the outer wall of the inner core (2) is sealed with the inner wall of the guide hole (5), and a sealing head (7) is formed at one end of the inner core (2), and the sealing head (7) is sealed with the sealing head (6). The sealing groove (4) is matched with the sealing head (7), the other end of the sealing head (7) is connected to the nut (8), the nut (8) and the sealing head (7) are connected by threads, a spring (9) is arranged on the outer wall of the inner core (2) between the nut (8) and the inner convex ring (3), corresponding positioning holes (10) are formed in the nut (8) and the inner core (2), a positioning pin (11) is arranged in the positioning hole (10), and the nut (8) is positioned and matched with the inner core (2) through the positioning pin (11).

2. A high-precision blowing valve for an injection mold as claimed in claim 1, characterized in that: The inner wall of the sealing groove (4) is formed with an inner sealing surface (12), and the outer wall of the sealing head (7) is formed with an outer sealing surface (13), and the outer sealing surface (13) is sealingly matched with the inner sealing surface (12).

3. A high-precision blowing valve for an injection mold as claimed in claim 1, characterized in that: A gasket (14) is arranged on the outer wall of the inner core (2), one side of the gasket (14) is in contact with the spring (9), and the other side of the gasket (14) is in contact with the nut (8).

4. A high-precision blowing valve for an injection mold as claimed in claim 1, characterized in that: The outer wall of the housing (1) is provided with a step (15).

5. A high-precision blowing valve for an injection mold as claimed in claim 4, characterized in that: The step (15) is provided with a slot (16), and when blowing, the positioning pin (11) and the slot (16) are limitedly matched.

6. A high-precision blowing valve for an injection mold as claimed in claim 1, characterized in that: Four air inlet holes (6) are formed in the inner convex ring (3) of the housing (1).

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