Efficient exhaust structure of plastic mold

Abstract

The application relates to the technical field of plastic molds, in particular to an efficient exhaust structure of a plastic mold, which comprises a male die, one side of the male die is provided with a female die, one side of the male die close to the female die is provided with two exhaust grooves, one side of the male die close to the female die is provided with a first mold cavity, one side of the female die close to the male die is provided with a second mold cavity, the inside of the male die is provided with two exhaust holes, the outer surface of the male die is fixedly connected with two gas storage cylinders, and the outer surface of the male die is provided with two three-way pipes. The three-way pipe and the gas storage cylinder are arranged, the three-way pipe and the gas storage cylinder are matched with each other, the gas storage cylinder can exhaust the gas in the first mold cavity and the second mold cavity through the three-way pipe, the exhaust hole and the exhaust groove, and the exhaust efficiency is improved through the three-way pipe and the gas storage cylinder.

Description

Technical Field

[0001] This application relates to the technical field of plastic molds, and in particular to a high-efficiency venting structure for plastic molds. Background Technology

[0002] A plastic mold is a type of mold with a highly efficient venting structure used in compression molding, extrusion molding, injection molding, blow molding, and low-foaming molding. The coordinated changes in the mold's punch, die, and auxiliary molding system allow for the production of a series of plastic parts of different shapes and sizes. It mainly includes a die with a variable cavity, consisting of a die assembly base plate, die components, and die assembly clamping plates; and a punch with a variable core, consisting of a punch assembly base plate, punch components, punch assembly clamping plates, cavity cut-off components, and side cut-off plates.

[0003] Regarding the aforementioned related technologies, the inventors discovered the following defects: air exists inside the mold cavity of the plastic mold, and molten plastic also generates gas, which interferes with the molding of the product. In the prior art, the venting efficiency of the plastic mold is low, making it difficult to expel air from the mold cavity in a timely manner, which affects the molding quality and production efficiency. In order to solve the problem of low venting efficiency in the prior art, this application sets up components such as a three-way pipe and an air storage cylinder, so that the air storage cylinder can draw out the air from the mold cavity through the three-way pipe, thereby improving the venting efficiency. Utility Model Content

[0004] To improve venting efficiency, this application provides a high-efficiency venting structure for plastic molds.

[0005] This application provides a high-efficiency venting structure for a plastic mold, employing the following technical solution: A high-efficiency venting structure for a plastic mold includes a punch, a die on one side of the punch, two venting grooves on the side of the punch near the die, a first mold cavity on the side of the punch near the die, each venting groove communicating with the first mold cavity, a second mold cavity on the side of the die near the punch, an injection hole inside the die communicating with the second mold cavity, two venting holes inside the punch, one end of each venting hole communicating with a corresponding venting hole, two air storage cylinders fixedly connected to the outer surface of the punch, and two three-way pipes installed on the outer surface of the punch, one end of each three-way pipe communicating with the other end of the corresponding venting hole via a first one-way valve.

[0006] Optionally, the punch is internally fixedly connected to four sleeves, and the die is internally fixedly connected to four sleeve rods.

[0007] Optionally, a second one-way valve is installed at the third end of each of the three-way tubes, through which air inside the three-way tube can be discharged.

[0008] Optionally, each of the gas storage cylinders is provided with a piston block inside, and a piston rod is fixedly connected to the outer surface of each piston block.

[0009] Optionally, a drive bar is fixedly connected to the other end of each piston rod, and a push rod is fixedly connected to both ends of each drive bar.

[0010] Optionally, a drive plate is provided on the other side of the punch, and the side of the drive plate near the punch is fixedly connected to the other end of the push rod.

[0011] Optionally, a spring is fitted onto the outer surface of each push rod, and one end of each spring is in contact with the outer surface of the punch.

[0012] Optionally, the second end of each of the three-way tubes is connected to the interior of the corresponding gas storage cylinder.

[0013] In summary, this application includes the following beneficial technical effects: 1. This utility model, by setting up components such as a three-way pipe and an air storage cylinder, and through the cooperation between the three-way pipe and the air storage cylinder, enables the air storage cylinder to extract the gas inside the first mold cavity and the second mold cavity through the three-way pipe, the exhaust hole and the exhaust groove, thereby achieving the effect of improving the exhaust efficiency by setting up components such as a three-way pipe and an air storage cylinder.

[0014] 2. This utility model, by setting components such as push rods and springs, and through the cooperation between the push rods and springs, enables the push rod to drive the drive bar to move after the spring pushes the punch and die to fit together, thereby causing the drive bar to drive the piston rod and piston block to move, thus achieving the effect of controlling the exhaust interval by setting push rods and springs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall modular state structure in the embodiments of this application; Figure 2 This is a schematic diagram of the overall mold closing state structure in the embodiments of this application; Figure 3 This is a schematic diagram of the internal structure of the punch in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the cavity mold in the embodiment of this application.

[0016] Reference numerals: 1. Punch; 2. Die; 3. Vent groove; 4. Vent hole; 5. Air reservoir; 6. First mold cavity; 7. Second mold cavity; 8. Three-way tube; 9. First one-way valve; 10. Sleeve; 11. Sleeve rod; 12. Second one-way valve; 13. Piston block; 14. Piston rod; 15. Drive bar; 16. Push rod; 17. Drive plate; 18. Spring. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-4 The figure provides a further detailed description of this application.

[0018] This application discloses an efficient venting structure for plastic molds. For example... Figure 1 , 2 As shown in Figures 3 and 4, a high-efficiency venting structure for a plastic mold includes a punch 1, a die 2 on one side of the punch 1, two venting grooves 3 on the side of the punch 1 near the die 2, and two venting holes 4 inside the punch 1. One end of each venting hole 4 is connected to a corresponding venting hole 4. Each venting groove 3 is connected to a first mold cavity 6. A second mold cavity 7 is provided on the side of the die 2 near the punch 1. An injection hole is provided inside the die 2 and is connected to the second mold cavity 7. The injection hole is used to connect to a material conveying mechanism to inject molten plastic into the second mold cavity 7. The first mold cavity 6 is provided on the side of the punch 1 near the die 2. Several through holes are provided inside the first mold cavity 6 for the passage of ejector pins and to assist in venting. Two air storage cylinders are fixedly connected to the outer surface of the punch 1. 5. Two three-way pipes 8 are installed on the outer surface of the punch 1. One end of each three-way pipe 8 is connected to the other end of the corresponding vent hole 4 through the first one-way valve 9. The air inside the vent hole 4 can enter the interior of the three-way pipe 8 through the first one-way valve 9. The second end of each three-way pipe 8 is connected to the interior of the corresponding air storage cylinder 5. The air storage cylinder 5 can extract the air inside the vent hole 4 through the three-way pipe 8 and the first one-way valve 9. When the punch 1 and the die 2 are in the mold closing state, the raw material enters the interior of the second mold cavity 7 and the first mold cavity 6 through the injection hole. The gas inside the first mold cavity 6 and the second mold cavity 7 enters the vent hole 4 through the vent groove 3, and then enters the interior of the air storage cylinder 5 through the first one-way valve 9 and the three-way pipe 8, so that the interior of the first mold cavity 6 and the second mold cavity 7 is in a near-vacuum state, thereby improving the venting efficiency.

[0019] Please see Figure 3 Each air storage cylinder 5 has a piston block 13 inside. The piston block 13 is made of rubber. The outer surface of the piston block 13 is in close contact with the inner wall of the air storage cylinder 5. A piston rod 14 is fixedly connected to the outer surface of each piston block 13. The piston rod 14 is used to drive the piston block 13 to move, thereby realizing the intake or exhaust of air from the air storage cylinder 5.

[0020] Please see Figure 3 Each three-way tube 8 is equipped with a second one-way valve 12 at its third end. Air inside the three-way tube 8 can be discharged through the second one-way valve 12. When the piston block 13 moves away from the three-way tube 8, the first one-way valve 9 opens, and air inside the exhaust groove 3 and exhaust hole 4 enters the air storage cylinder 5 through the three-way tube 8. When the piston block 13 moves closer to the three-way tube 8, the second one-way valve 12 opens, and air inside the air storage cylinder 5 is discharged through the three-way tube 8 and the second one-way valve 12.

[0021] Please see Figure 1 , 2 3, 4. The punch 1 is fixedly connected to four sleeves 10 inside, and the die 2 is fixedly connected to four sleeve rods 11 inside. The outer surface of each sleeve rod 11 is slidably connected to the inside of the corresponding sleeve 10. The sleeves 10 and sleeve rods 11 are used to limit and support the movement of the punch 1.

[0022] Please see Figure 1 , 2 Each piston rod 14 has a drive bar 15 fixedly connected to its other end. When the drive bar 15 moves away from the punch 1, it drives the piston rod 14 and piston block 13 to move, and the air storage cylinder 5 performs air extraction. When the drive bar 15 moves closer to the punch 1, the air storage cylinder 5 performs air exhaust, and the punch 1 and the die 2 separate. Each drive bar 15 has a push rod 16 fixedly connected to both ends. The outer surface of each push rod 16 slides in contact with the inside of the punch 1. The push rod 16 is used to drive the movement of the drive bar 15 and other components, and at the same time provides auxiliary positioning and support for the punch 1.

[0023] Please see Figure 1 , 2 A drive plate 17 is provided on the other side of the punch 1. The other side of the drive plate 17 is used to connect with the hydraulic drive mechanism. The side of the drive plate 17 near the punch 1 is fixedly connected to the other end of the push rod 16. The drive plate 17 can be moved by the push rod 16.

[0024] Please see Figure 1 , 2 Each push rod 16 has a spring 18 fitted on its outer surface. One end of each spring 18 is in contact with the outer surface of the punch 1, and the other end of each spring 18 is in contact with the side of the drive plate 17 near the punch 1. The drive plate 17 can drive the punch 1 to move closer to the die 2 through the spring 18, so that the punch 1 and the die 2 can be closed.

[0025] The implementation principle of the efficient venting structure of a plastic mold in this application embodiment is as follows: When the mold is closed, the hydraulic drive mechanism drives the drive plate 17 to move. The drive plate 17 drives the punch 1 to move closer to the die 2 through the spring 18. After the punch 1 and the die 2 are closed, the material is injected into the mold cavity from the injection hole. The gas inside the mold cavity enters the venting hole 4 through the venting groove 3. At the same time, the drive plate 17 and the push rod 16 continue to drive the drive bar 15 to move. The drive bar 15 drives the piston rod 14 and the piston block 13 to move. The air storage cylinder 5 extracts the gas inside the venting hole 4 through the three-way pipe 8 and the first one-way valve 9. After the material cools down, the drive plate 17 moves in the opposite direction. The push rod 16 and the drive bar 15 drive the piston rod 14 and the piston block 13 to move in the opposite direction. The air inside the air storage cylinder 5 is discharged through the three-way pipe 8 and the second one-way valve 12. At the same time, the drive bar 15 drives the punch 1 and the die 2 to move away from each other through the air storage cylinder 5 and other components, thus completing the mold separation.

[0026] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-efficiency venting structure for a plastic mold, comprising a punch (1), characterized in that: A die (2) is provided on one side of the punch (1). Two venting grooves (3) are opened on the side of the punch (1) near the die (2). A first mold cavity (6) is opened on the side of the punch (1) near the die (2). Each venting groove (3) is connected to the first mold cavity (6). A second mold cavity (7) is opened on the side of the die (2) near the punch (1). An injection hole is opened inside the die (2). The injection hole is connected to the second mold cavity (7). Two venting holes (4) are opened inside the punch (1). One end of each venting hole (4) is connected to the corresponding venting hole (4). Two air storage cylinders (5) are fixedly connected to the outer surface of the punch (1). Two three-way pipes (8) are installed on the outer surface of the punch (1). One end of each three-way pipe (8) is connected to the other end of the corresponding venting hole (4) through a first one-way valve (9).

2. The high-efficiency venting structure for a plastic mold according to claim 1, characterized in that: The punch (1) has four sleeves (10) fixedly connected inside, and the die (2) has four sleeve rods (11) fixedly connected inside.

3. The high-efficiency venting structure for a plastic mold according to claim 1, characterized in that: Each of the three-way tubes (8) is equipped with a second one-way valve (12) at its third end, through which air inside the three-way tube (8) can be discharged.

4. The high-efficiency venting structure for a plastic mold according to claim 1, characterized in that: Each of the gas storage cylinders (5) is provided with a piston block (13) inside, and a piston rod (14) is fixedly connected to the outer surface of each piston block (13).

5. The high-efficiency venting structure for a plastic mold according to claim 4, characterized in that: Each piston rod (14) is fixedly connected to a drive bar (15) at the other end, and each drive bar (15) is fixedly connected to a push rod (16) at both ends.

6. The high-efficiency venting structure for a plastic mold according to claim 5, characterized in that: A drive plate (17) is provided on the other side of the punch (1), and the side of the drive plate (17) near the punch (1) is fixedly connected to the other end of the push rod (16).

7. The high-efficiency venting structure for a plastic mold according to claim 5, characterized in that: Each push rod (16) has a spring (18) fitted onto its outer surface, and one end of each spring (18) is in contact with the outer surface of the punch (1).

8. The high-efficiency venting structure for a plastic mold according to claim 1, characterized in that: The second end of each of the three-way tubes (8) is connected to the interior of the corresponding gas storage cylinder (5).

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