Exhaust valve structure of plastic mould

Abstract

The exhaust valve structure comprises an outer sleeve and a core, the outer sleeve is provided with a through inner hole, the upper portion of the inner hole is provided with a conical surface opening, the core is coaxially arranged in the inner hole of the outer sleeve, the upper portion of the core is provided with a blocking protruding head matched with the conical surface opening of the outer sleeve, and the inner hole of the outer sleeve is provided with a through hole. A buffer body is arranged on the conical surface opening of the outer sleeve or the plugging raised head of the core, a spring is arranged at the lower part of the core, and the spring jacks up the core in a normal state, so that a gap channel is formed between the plugging raised head of the core and the conical surface opening of the outer sleeve. According to the exhaust valve structure of the plastic mold, the buffer body is additionally arranged, so that impact vibration of the core and the outer sleeve can be absorbed, direct friction between metals is reduced, and the service life of the exhaust valve is prolonged; and meanwhile, the buffer body can further play a sealing role, so that a sizing material cannot enter the inner hole of the outer sleeve, and the forming quality of a product is improved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a structure for an exhaust valve in a plastic mold. Background Technology

[0002] In the plastic molding process, the venting valve is a key component that ensures gas is released when molten plastic is filled, preventing air bubbles or material shortages in the product.

[0003] The prior art patent document "An Exhaust Valve for a Tire Mold" (publication number CN207893201U) discloses an exhaust valve for a tire mold, including a valve body and a valve stem passing through the inner hole of the valve body. The valve stem extends out of the valve body at both ends. A sealing head is provided at the front end of the valve stem, and the sealing head and the front end of the inner hole of the valve body are provided with mutually cooperating closed conical surfaces. A limiting block with a maximum outer diameter larger than the diameter of the rear end of the inner hole of the valve body is provided at the rear end of the valve stem. A ball bearing portion is provided on the inner wall of the valve body, including at least one row of balls. Each row of balls includes several balls evenly distributed along the circumference of the inner wall of the valve body. A sleeve is provided on the valve stem, and the sleeve is in close contact with the ball bearing portion. When the valve stem is pressed backward, the sleeve can disengage from the ball bearing portion. When the sleeve is just disengaged from the ball bearing portion, the sealing head and the front conical surface of the inner hole of the valve body are not completely in contact. A compression spring is sleeved on the valve stem, and the front and rear ends of the compression spring press on the sleeve and the step at the rear end of the inner hole of the valve body, respectively. Although the above-mentioned exhaust valve can depress the valve stem slowly at first and then quickly during the exhaust process, allowing the gas to be discharged evenly in the early stage to avoid the formation of air bubbles, and quickly sealing the exhaust passage in the later stage to prevent rubber from entering the exhaust passage, this technical solution is not perfect. The main problems are: the sealing head at the front end of the valve stem and the valve body will often touch each other, and as the usage time goes by, the contact surface between the two will be damaged, leading to functional failure; and there is no buffer structure between the two.

[0004] Therefore, there is an urgent need for a plastic mold venting valve structure. Utility Model Content

[0005] In view of the shortcomings of the prior art, this utility model provides a plastic mold exhaust valve structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A plastic mold venting valve structure includes an outer sleeve and a core. The outer sleeve has a through inner hole with a conical opening at the upper part. The core is coaxially disposed in the inner hole of the outer sleeve. The upper part of the core has a sealing protrusion that mates with the conical opening of the outer sleeve. A buffer body is provided on the conical opening of the outer sleeve or the sealing protrusion of the core. A spring is provided on the lower part of the core. Under normal conditions, the spring lifts the core, so that the sealing protrusion of the core and the conical opening of the outer sleeve form a gap channel.

[0008] Furthermore, a fitting clearance of 0.05-0.1mm is reserved between the outer diameter of the core and the inner hole of the outer sleeve.

[0009] Furthermore, the cone angle of the opening of the outer casing is 30°-60°, and the sealing protrusion of the core has a matching cone angle.

[0010] Furthermore, the conical opening of the outer casing or the sealing protrusion of the core is provided with a high-temperature resistant buffer gel, which is arranged around the conical surface of the sealing protrusion.

[0011] Furthermore, the lower part of the core is provided with a spring slot, which is an annular groove structure with a depth greater than 1 / 2 of the spring wire diameter. The upper end of the spring abuts against the spring slot, and the lower end of the spring abuts against the upper part of the mold support plate.

[0012] Furthermore, the upper part of the mold support plate is provided with an exhaust groove that communicates with the inner hole of the outer sleeve.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] A plastic mold venting valve structure is provided, including an outer sleeve and a core. The outer sleeve has a through-hole with a conical opening at the top. The core is coaxially positioned within the inner hole of the outer sleeve. The top of the core has a sealing protrusion that mates with the conical opening of the outer sleeve. A buffer is installed on either the conical opening of the outer sleeve or the sealing protrusion of the core. This buffer absorbs the impact vibration between the core and the outer sleeve, reducing direct metal-to-metal friction and extending the service life of the venting valve. It also reduces the risk of damage from collisions between the contact surfaces. Furthermore, the buffer provides a seal, preventing the plastic material from entering the inner hole of the outer sleeve, thus improving product molding quality. This design overcomes the limitations of existing technologies where the sealing head at the front end of the valve stem frequently contacts the valve body, leading to damage at the contact surface and functional failure. Attached Figure Description

[0015] Figure 1 The figure shown is a three-dimensional structural diagram of the exhaust valve of this utility model;

[0016] Figure 2 As shown Figure 1 Enlarged view of part of structure A in the middle;

[0017] Figure 3 As shown Figure 1 Enlarged view of part of structure B in the middle;

[0018] Figure 4 The diagram shown is a structural diagram of the exhaust valve (core open state) of this utility model applied to a mold;

[0019] Figure 5The diagram shown is a structural diagram of the exhaust valve (core closed state) of this utility model applied to a mold;

[0020] Figure 6 As shown Figure 5 Enlarged view of the C-shaped structure.

[0021] In the diagram: 1. Outer shell; 2. Core; 3. Spring; 4. High-temperature resistant buffer colloid; 5. Mold support plate; 6. Venting groove; 7. Template; 8. Rubber material; 11. Conical opening; 21. Sealing protrusion; 22. Spring slot. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] See Figure 1-6 As shown, this utility model provides a technical solution: a plastic mold vent valve structure, including an outer sleeve 1 and a core 2. The outer sleeve 1 has a through inner hole, and the upper part of the inner hole has a conical opening 11. The core 2 is coaxially disposed in the inner hole of the outer sleeve 1. The upper part of the core 2 has a sealing protrusion 21 that cooperates with the conical opening of the outer sleeve. The conical opening 11 of the outer sleeve 1 or the sealing protrusion 21 of the core 2 is provided with a buffer body. The lower part of the core 2 is provided with a spring 3. Under normal conditions, the spring 3 lifts the core 2, so that the sealing protrusion 21 of the core 2 and the conical opening 11 of the outer sleeve 1 form a gap channel. This plastic mold vent valve structure overcomes the problem in the prior art where the sealing head at the front end of the valve column and the valve shell often come into contact, causing damage to the contact surface and resulting in functional failure.

[0024] A 0.05-0.1mm clearance is reserved between the outer diameter of the core 2 and the inner hole of the outer sleeve 1 to prevent the core 2 from jamming with the outer sleeve 1 while allowing gas to flow. The cone angle of the cone opening 11 of the outer sleeve 1 is 30°-60°, and the sealing protrusion 21 of the core 2 has a matching cone angle.

[0025] See Figure 2As shown, a high-temperature resistant buffer colloid 4 is provided on the conical opening 11 of the outer jacket 1 or the sealing protrusion 21 of the core 2. In this embodiment, the high-temperature resistant buffer colloid 4 is placed on the sealing protrusion 21 area of ​​the core 2, and the high-temperature resistant buffer colloid 4 is arranged around the conical surface of the sealing protrusion 21. In order for the high-temperature resistant buffer colloid 4 to be stably placed on the conical surface area of ​​the sealing protrusion 21, a groove is provided in the conical surface area for the high-temperature resistant buffer colloid 4 to be embedded. The high-temperature resistant buffer colloid 4 is made of silicone or fluororubber, with a temperature resistance of ≥250℃, and has both elasticity and wear resistance. The high-temperature resistant buffer colloid 4 absorbs the impact vibration of the core 2 and the outer jacket 1, reduces direct metal-to-metal friction, and extends the service life of the exhaust valve. At the same time, the high-temperature resistant buffer colloid 4 can further play a sealing role, preventing the colloid material from entering the inner hole of the outer jacket 1, thus improving the product molding quality.

[0026] See Figure 3-4 As shown, the lower part of the core 2 is provided with a spring groove 22, which is an annular groove structure with a depth greater than 1 / 2 of the spring wire diameter. The upper end of the spring 3 abuts against the spring groove 22, and the lower end of the spring 3 abuts against the upper part of the mold support plate 5. The depth of the spring groove 22 is designed to be greater than 1 / 2 of the spring wire diameter to ensure that the upper end of the spring 3 is firmly engaged, preventing displacement or loosening caused by long-term vibration; the lower end of the spring 3 directly abuts against the mold support plate 5, using the rigid structure of the mold itself to provide stable support.

[0027] See Figure 4-5 As shown, the upper part of the mold support plate 5 is provided with an exhaust groove 6 that communicates with the inner hole of the outer sleeve 1. The exhaust groove 6 is directly connected to the inner hole of the outer sleeve 1. After passing through the gap channel, the gas is quickly guided to the inner hole and discharged into the exhaust groove 6 of the support plate 5. There is no need to open a complicated exhaust hole or add a sealing structure.

[0028] Working principle: The exhaust valve is installed inside the template 7, and the lower end of the exhaust valve abuts against the upper part of the mold support plate 5. (See reference...) Figure 1-2 Under normal conditions, the core 2 is lifted by the spring 3, creating a gap channel between the sealing protrusion 21 of the core 2 and the conical opening 11 of the outer sleeve 1. During mold production, the gas generated by the flow of the rubber material and the air inside the mold are discharged through this gap channel into the inner hole and into the venting groove 6 of the support plate 5. (See reference...) Figure 5-6 When the adhesive flows to the exhaust valve position, the adhesive 8 will press the core 2, causing the core 2 to overcome the spring force and move downward, thus sealing the gap channel formed by the sealing protrusion 21 of the core 2 and the conical opening 11 of the outer sleeve 1. Since there is a high-temperature resistant buffer adhesive 4 between the sealing protrusion 21 of the core 2 and the conical opening 11 of the outer sleeve 1, it can further play a sealing role, preventing the adhesive from entering the inner hole of the outer sleeve 1, improving the product molding quality, and overcoming the problem that in the prior art, the valve column front sealing head and the valve shell will often touch, causing damage to the contact surface and functional failure.

Claims

1. A plastic mold venting valve structure, comprising an outer sleeve (1) and a core (2), characterized in that, The outer sleeve (1) has a through inner hole, and the upper part of the inner hole has a conical opening (11). The core (2) is coaxially disposed in the inner hole of the outer sleeve (1). The upper part of the core (2) has a sealing protrusion (21) that matches the conical opening of the outer sleeve. A buffer body is provided on the conical opening (11) of the outer sleeve (1) or the sealing protrusion (21) of the core (2). A spring (3) is provided on the lower part of the core (2). The spring (3) normally lifts the core (2) so that the sealing protrusion (21) of the core (2) and the conical opening (11) of the outer sleeve (1) form a gap channel. High-temperature resistant buffer colloid (4) is provided on the conical opening (11) of the outer jacket (1) or the sealing protrusion (21) of the core (2), and the high-temperature resistant buffer colloid (4) is arranged around the conical surface of the sealing protrusion (21).

2. The plastic mold venting valve structure according to claim 1, characterized in that, A clearance of 0.05-0.1mm is reserved between the outer diameter of the core (2) and the inner hole of the outer sleeve (1).

3. The plastic mold venting valve structure according to claim 1, characterized in that, The cone angle of the cone opening (11) of the outer jacket (1) is 30°-60°, and the sealing protrusion (21) of the core (2) has a matching cone angle.

4. The plastic mold vent valve structure according to claim 1, characterized in that, The lower part of the core (2) is provided with a spring slot (22), which is an annular groove structure with a depth greater than 1 / 2 of the spring wire diameter. The upper end of the spring (3) abuts in the spring slot (22), and the lower end of the spring (3) abuts in the upper part of the mold support plate (5).

5. The plastic mold venting valve structure according to claim 4, characterized in that, The upper part of the mold support plate (5) is provided with an exhaust groove (6) that communicates with the inner hole of the outer sleeve (1).

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