Gas cap demolding structure for rotational molding mold

Abstract

The utility model relates to the technical field of rotational molding demolding, in particular to a gas cap demolding structure for a rotational molding mold. The communicating pipe extends into the mold and comprises a plurality of groups of gas cap demolding mechanisms; the multiple sets of gas cap demolding mechanisms are all mounted on the mold, and each gas cap demolding mechanism comprises a mounting barrel, a buffer chamber, a communicating pipe, a plugging pipe, a lower sealing plate, a connecting rod, a spring, a limiting block, a plugging head a and a plugging head b. The speed of output airflow can be reduced, the situation that high-speed airflow is directly blown to a workpiece to cause deformation of the workpiece is prevented, and the production quality of products is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotational molding demolding, in particular to a gas-assisted demolding structure for a rotational molding mold. Background Technique

[0002] Rotational molding is a method for forming hollow thermoplastic plastics. First, powdery, paste-like or monomer materials are injected into a mold. By heating the mold and rotating it biaxially, the materials are evenly distributed in the inner cavity of the mold by their own gravity and melted. After cooling, the hollow product is demolded. The conventional mold demolding uses ejector pins to eject the product from the mold. Since the products produced by the rotational molding process are all hollow structures, when using ejector pins to demold the products produced by the rotational molding process, it is easy to break the products, resulting in unqualified products. Therefore, using a gas-assisted demolding method can improve the yield of the products.

[0003] Chinese Patent with Publication No. CN218803507U discloses a gas-assisted demolding structure for a rotational molding mold, which relates to the field of rotational molding demolding technology. It includes a gas-assisted demolding assembly for inflating the mold. The gas-assisted demolding assembly includes a valve body, a valve core and an elastic member. The valve body is fixed on the outer side of the bottom of the mold. An inflation hole is opened at one end of the valve body close to the mold. The valve core and the elastic member are both located inside the valve body. The valve core is slidably matched with the inner wall of the valve body. Two ends of the elastic member respectively abut against the bottom of the valve body and the valve core. A sealing head for cooperating with the inflation hole for sealing is arranged at one end of the valve core close to the inflation hole. The sealing head is pressed tightly at the inflation hole by the elastic member. An air inlet hole is opened on the side wall of the valve body on the side of the valve core close to the inflation hole.

[0004] The above-mentioned disclosed patent still has the following technical defects: due to the setting of the elastic member, to push the valve core to move downward, the internal air pressure of the valve body needs to be increased. The increased air pressure flows out through the gap between the inflation hole and the sealing head, and the high-speed air flow directly impacts on the surface of the product, which is easy to cause deformation of the product. Summary of the Utility Model

[0005] The purpose of the utility model is to propose a gas-assisted demolding structure for a rotational molding mold aiming at the problems existing in the background technique.

[0006] The technical solution of the utility model, a gas-assisted demolding structure for a rotational molding mold, includes multiple groups of gas-assisted demolding mechanisms;

[0007] Multiple sets of air-actuated demolding mechanisms are all installed on the mold. The air-actuated demolding mechanism includes an installation cylinder body, a buffer chamber, a connecting pipe, a plugging pipe, a lower sealing plate, a connecting rod, a spring, a limiting block, a plugging head a and a plugging head b. Among them, the buffer chamber is connected to the inside of the mold through the connecting pipe, the installation cylinder body is connected to the inside of the buffer chamber, the plugging pipe is connected and arranged at the bottom end of the buffer chamber and is located inside the installation cylinder body, the connecting rod is movably arranged inside the buffer chamber and the installation cylinder body, the plugging head a, the plugging head b and the lower sealing plate are sequentially arranged on the connecting rod, a sealing ring is arranged on the circumferential side of the lower sealing plate, the spring is sleeved on the connecting rod, and one end of the connecting rod movably penetrates through the end of the installation cylinder body; an air inlet end connecting pipe is connected and arranged on each of the multiple installation cylinder bodies.

[0008] Preferably, an upper sealing plate is fixed on the connecting rod. The upper sealing plate is located between the lower sealing plate and the plugging head b. A sealing ring is also arranged on the circumferential side of the upper sealing plate. Two rotating plates are symmetrically arranged on the connecting rod. Both of the two rotating plates are located between the upper sealing plate and the lower sealing plate. Vent holes are opened on the upper sealing plate.

[0009] Preferably, the end of the air inlet end connecting pipe extends into the inside of the installation cylinder body and is located between the upper sealing plate and the lower sealing plate.

[0010] Preferably, at least five sets of air-actuated demolding mechanisms are provided. At least one set is provided at each position of the four corners and the middle part of the mold.

[0011] Preferably, the inner diameter of the buffer chamber is larger than the inner diameter of the installation cylinder body.

[0012] Preferably, the end of the connecting pipe extending to the inside of the mold is flush with the inner side surface of the mold.

[0013] Preferably, an anti-direct blowing plate is arranged on the connecting rod. The anti-direct blowing plate is located between the plugging head a and the plugging head b.

[0014] Compared with the prior art, the utility model has the following beneficial technical effects: The output gas enters the closed cavity between the plugging head b and the lower sealing plate. As the air pressure gradually increases, the lower sealing plate is forced to gradually move downward, that is, driving the plugging head b and the plugging head a to move downward. Subsequently, the air flow inside the installation cylinder body flows into the inside of the buffer chamber through the gap of the plugging pipe. Due to the sudden increase in its internal volume by the provided buffer chamber, the flow rate of the gas is reduced, preventing the high-speed air flow from impacting and deforming the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 and Figure 3 Both are cross-sectional structural diagrams of the installation cylinder body and the buffer chamber in the utility model.

[0017] Reference Numerals: 1, mold; 2, mounting cylinder; 3, buffer chamber; 4, connecting pipe; 5, plugging pipe; 6, upper sealing plate; 601, ventilation hole; 7, lower sealing plate; 8, sealing ring; 9, connecting rod; 10, spring; 11, anti-direct blowing plate; 12, plugging head a; 13, plugging head b; 14, rotating plate; 15, intake end connecting pipe. Detailed Embodiment

[0018] Embodiment 1

[0019] As Figures 1-3 shown, a gas-assisted demolding structure for a rotational molding mold proposed in this embodiment, the connecting pipe 4 extends into the mold 1 and includes multiple groups of gas-assisted demolding mechanisms.

[0020] At least five groups of gas-assisted demolding mechanisms are provided, and at least one group is provided at each position of the four corners and the middle of the mold 1. By arranging gas-assisted demolding mechanisms at various positions of the mold 1, multiple positions of the workpiece can be ejected simultaneously, avoiding concentrated force on one part of the workpiece and preventing the workpiece from being damaged or deformed due to excessive pressure; multiple groups of gas-assisted demolding mechanisms are all installed on the mold 1. The gas-assisted demolding mechanism includes a mounting cylinder 2, a buffer chamber 3, a connecting pipe 4, a plugging pipe 5, a lower sealing plate 7, a connecting rod 9, a spring 10, a limiting block, a plugging head a 12, and a plugging head b 13. Among them, the buffer chamber 3 is connected to the inside of the mold 1 through the connecting pipe 4. The end of the connecting pipe 4 extending into the mold 1 is flush with the inner side surface of the mold 1. The mounting cylinder 2 is connected to the inside of the buffer chamber 3. The inner diameter of the buffer chamber 3 is larger than the inner diameter of the mounting cylinder 2. The plugging pipe 5 is connected and arranged at the bottom end of the buffer chamber 3 and is located inside the mounting cylinder 2. The connecting rod 9 is movably arranged inside the buffer chamber 3 and the mounting cylinder 2. The plugging head a 12, the plugging head b 13, and the lower sealing plate 7 are sequentially arranged on the connecting rod 9. A sealing ring 8 is arranged on the periphery of the lower sealing plate 7. The spring 10 is sleeved on the connecting rod 9. One end of the connecting rod 9 movably penetrates through the end of the mounting cylinder 2; An intake end connecting pipe 15 is connected to each of the multiple mounting cylinders 2.

[0021] An anti-direct blowing plate 11 is arranged on the connecting rod 9. The anti-direct blowing plate 11 is located between the plugging head a 12 and the plugging head b 13. The anti-direct blowing plate 11 can play a role in dispersing the air flow and reducing the flow rate of the air flow.

[0022] The output gas enters the interior of the installation cylinder body 2 through the intake end connecting pipe 15. At this time, the gas is in the closed cavity between the plug b 13 and the lower sealing plate 7. As the air pressure gradually increases, it forces the lower sealing plate 7 to gradually move downward, which drives the connecting rod 9 to move. The connecting rod 9 in turn drives the plug b 13 and the plug a 12 to move downward. Subsequently, the airflow inside the installation cylinder body 2 flows into the interior of the buffer chamber 3 through the gap of the plugging pipe 5. Since the internal volume of the buffer chamber 3 is relatively large, the flow rate of the gas is reduced, preventing the high-speed airflow from deforming the workpiece by impact. The airflow then enters the interior of the mold 1 through the connecting pipe 4, thereby realizing the demolding work of the workpiece.

[0023] Embodiment 2

[0024] As Figure 2 and Figure 3 shown, a gas-lift demolding structure for a rotational molding mold proposed in this embodiment, compared with Embodiment 1, in this embodiment, an upper sealing plate 6 is fixed on the connecting rod 9. The upper sealing plate 6 is located between the lower sealing plate 7 and the plug b 13. Sealing rings 8 are also provided on the periphery of the upper sealing plate 6. Two rotating plates 14 are symmetrically arranged on the connecting rod 9. Both of the two rotating plates 14 are located between the upper sealing plate 6 and the lower sealing plate 7. An air vent hole 601 is provided on the upper sealing plate 6; the output gas enters between the upper sealing plate 6 and the lower sealing plate 7, and while driving the lower sealing plate 7 and the upper sealing plate 6 to move downward, it can also drive the rotating plates 14 to rotate. The rotation of the rotating plates 14 drives the plug a 12 to rotate, realizing the separation of the plug a 12 from the workpiece and preventing the workpiece from adhering to the plug a 12. After the rotating plates 14 rotate, the airflow flows out through the air vent hole 601.

[0025] The end of the intake end connecting pipe 15 extends into the interior of the installation cylinder body 2 and is located between the upper sealing plate 6 and the lower sealing plate 7. The protruding intake end connecting pipe can limit the rotation of the rotating plate 14, preventing the end of the rotating plate 14 on the side of continuous rotation from being flush with the inner side surface of the mold 1.

[0026] The above has described in detail the embodiments of the present utility model in conjunction with the accompanying drawings. However, the present utility model is not limited thereto. Within the scope of knowledge possessed by those skilled in the art to which it pertains, various changes can be made without departing from the gist of the present utility model.

Claims

1. An air top demoulding structure for a rotational moulding die, characterized in that, It includes multiple sets of air-top demolding mechanisms; Multiple sets of air-top demolding mechanisms are all installed on the mold (1). The air-top demolding mechanism includes an installation cylinder body (2), a buffer chamber (3), a connecting pipe (4), a blocking pipe (5), a lower sealing plate (7), a connecting rod (9), a spring (10), a limit block, a plug head a (12) and a plug head b (13). Among them, the buffer chamber (3) is connected to the inside of the mold (1) through the connecting pipe (4), the installation cylinder body (2) is connected to the inside of the buffer chamber (3), the blocking pipe (5) is connected and arranged at the bottom end of the buffer chamber (3) and is located inside the installation cylinder body (2), the connecting rod (9) is movably arranged inside the buffer chamber (3) and the installation cylinder body (2), the plug head a (12), the plug head b (13) and the lower sealing plate (7) are sequentially arranged on the connecting rod (9), a sealing ring (8) is arranged on the circumferential side of the lower sealing plate (7), the spring (10) is sleeved on the connecting rod (9), and one end of the connecting rod (9) movably penetrates through the end of the installation cylinder body (2); an air inlet end connecting pipe (15) is connected and arranged on each of the multiple installation cylinder bodies (2).

2. The air jack demoulding structure for a rotational moulding die according to claim 1, wherein, A upper sealing plate (6) is fixed on the connecting rod (9). The upper sealing plate (6) is located between the lower sealing plate (7) and the plug head b (13). A sealing ring (8) is also arranged on the circumferential side of the upper sealing plate (6). Two rotating plates (14) are symmetrically arranged on the connecting rod (9). Both of the two rotating plates (14) are located between the upper sealing plate (6) and the lower sealing plate (7). An air vent hole (601) is opened on the upper sealing plate (6).

3. The air ejection demoulding structure for a rotational moulding die according to claim 2, wherein, The end of the air inlet end connecting pipe (15) extends into the inside of the installation cylinder body (2) and is located between the upper sealing plate (6) and the lower sealing plate (7).

4. The air jack demolding structure for a rotational molding mold according to claim 1, characterized in that At least five sets of air-top demolding mechanisms are provided. At least one set is provided at each position of the four corners and the middle of the mold (1).

5. The air jack demolding structure for a rotational molding mold according to claim 1, characterized in that, The inner diameter of the buffer chamber (3) is larger than the inner diameter of the installation cylinder body (2).

6. The air jack demolding structure for a rotational molding mold according to claim 1, characterized in that, The end of the connecting pipe (4) extending to the inside of the mold (1) is flush with the inner side surface of the mold (1).

7. A gas-lift demolding structure for a rotational molding mold according to claim 1, characterized in that, A direct-blow prevention plate (11) is arranged on the connecting rod (9). The direct-blow prevention plate (11) is located between the plug head a (12) and the plug head b (13).

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