A mold stripping device for injection molding of plastic products

Abstract

The application relates to the technical field of injection molding and discloses a mold demolding device for injection molding of plastic products, which comprises a movable mold and a fixed mold, the movable mold and the fixed mold are provided with positioning mechanisms, the positioning mechanism comprises a forming seat which is slidably connected to the movable mold, the fixed mold is fixedly connected with a push rod corresponding to the forming seat, and the forming seat is provided with a positioning hole matched with the push rod; the fixed mold is a hollow structure filled with a demolding agent, the fixed mold is provided with a feeding cylinder, the feeding cylinder is respectively connected with an air pipe and a liquid inlet pipe, the feeding cylinder is provided with a pushing mechanism, the pushing mechanism comprises a sealing plate, the sealing plate is slidably connected to the inside of the feeding cylinder, the sealing plate is fixedly connected with a positioning rod, and the positioning rod and the sealing plate are elastically connected in the feeding cylinder; the end of the positioning rod is fixedly connected with a conical cap; through the technical scheme, the problem that demolding is difficult due to negative pressure during demolding can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and more specifically to a mold release device for injection molding of plastic products. Background Technology

[0002] Processing plastic products usually requires the use of injection molding machines. The whole process of smoothly separating and ejecting the plastic part from the mold cavity and core after the plastic has cooled and solidified in the mold is called injection molding demolding.

[0003] When injection molding products with greater height, the mold usually needs to be deep. During demolding, the deep cavity can easily create negative pressure between the product and the mold, making it difficult to demold. Existing technology usually involves creating venting grooves on the mold. However, creating venting grooves can only reduce the amount of air left when the mold is closed. It is difficult to break the negative pressure environment between the product and the cavity when the mold is opened and demolded. Therefore, the improvement effect on the demolding difficulty of deep cavity injection molded products is limited. At the same time, the release agent is usually applied in advance before the mold is closed. After multiple injections, the release agent on the surface of the cavity will be gradually carried away by the product. It is impossible to guarantee a good demolding effect every time, and frequent shutdowns are required for re-spraying, which affects the injection molding efficiency. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a mold release device for injection molding of plastic products, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] This invention provides a mold release device for injection molding of plastic products, comprising a moving mold and a fixed mold. Positioning mechanisms are provided on the moving mold and the fixed mold. Each positioning mechanism includes a molding seat slidably connected to the moving mold. A push rod corresponding to the molding seat is fixedly connected to the fixed mold. The molding seat has a positioning hole that mates with the push rod. The fixed mold is a hollow structure containing a release agent. A feed cylinder is provided inside the fixed mold. An air pipe and a liquid inlet pipe are connected to the feed cylinder. A pushing mechanism is provided inside the feed cylinder. The pushing mechanism includes a sealing plate slidably connected inside the feed cylinder. A positioning rod is fixedly connected to the sealing plate. The positioning rod and the sealing plate are elastically connected inside the feed cylinder. A conical cap is fixedly connected to the end of the positioning rod. A conical cylinder mates with the conical cap is slidably connected inside the feed cylinder. A liquid outlet hole mates with the conical cylinder is provided on the feed cylinder.

[0007] It also includes two molding seats that are slidably connected to both ends of the moving mold, and the positioning mechanism includes a magnetic block that is slidably connected inside the molding seat. The molding seat has a mounting frame containing the magnetic block that is fixedly connected inside it. The molding seat is a hollow structure and is filled with coolant.

[0008] It also includes a groove on the fixed mold that mates with the forming seat, an installation block fixedly connected to the moving mold, a forming rod fixedly connected to the installation block, and the forming rod and forming seat combined to form the shape of the product.

[0009] It also includes a positioning seat in the feeding cylinder, wherein the positioning seat is fixedly connected to the feeding cylinder and a first elastic element is connected between the positioning seat and the sealing plate.

[0010] It also includes a conical block that mates with a cone cap fixedly connected to the conical cylinder, a movable seat fixedly connected to the conical cylinder, an installation ring fixedly connected inside the feed cylinder, and the movable seat slidably connected to the installation ring.

[0011] It also includes a limiting rail fixedly connected to the mounting ring, a movable seat slidably connected to the limiting rail, and a second elastic element connecting the movable seat and the feed cylinder.

[0012] It also includes a connecting ring fixedly connected to the outer wall of the feed cylinder, a fixed frame slidably connected to the outer wall of the feed cylinder, the fixed frame being fixedly connected to the inner wall of the fixed mold, an electric push rod being installed on the fixed frame, and the telescopic end of the electric push rod being fixedly connected to the connecting ring.

[0013] It also includes that the air pipe extends to the outside of the fixed mold, the air pipe and the feed cylinder are slidably connected, and the liquid outlet holes on the feed cylinder are distributed in a ring.

[0014] It also includes a molding cavity on the mounting block, a molding rod fixedly connected to the molding cavity, a sliding groove on the moving mold, and a limiting groove on the moving mold, the limiting groove cooperating with the push rod.

[0015] It also includes a fixed base fixedly connected to the fixed mold, a through hole opened in the molding cavity, a push rod slidably connected in the through hole, the push rod extending to the outside of the moving mold, a partition plate provided in the fixed base, and the release agent being filled in the cavity formed by the partition plate and the fixed base.

[0016] The technical solution provided by this invention has the following advantages compared with the prior art:

[0017] This invention utilizes a combination of a feed cylinder, a release agent, an air pipe, and a liquid inlet pipe. The release agent is sprayed into the cavity of the fixed mold through the feed cylinder, facilitating demolding and preventing the product from adhering to the cavity after molding. After the release agent is sprayed, gas is delivered to the feed cylinder through the air pipe, and then the gas flows out through the liquid outlet, quickly drying the release agent in the fixed mold cavity and improving demolding efficiency. During demolding, gas can also be introduced to separate the product from the cavity, preventing negative pressure from causing the product to stick to the fixed mold cavity and making demolding impossible. At the same time, the pusher mechanism can automatically clean the liquid outlet under the drive of gas, preventing the liquid outlet from being blocked by the dried release agent. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 This is a partial structural schematic diagram of an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the positioning mechanism structure in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the fixed mold structure in an embodiment of the present invention;

[0023] Figure 5 This is a schematic cross-sectional view of the moving mold in an embodiment of the present invention;

[0024] Figure 6 This is a schematic cross-sectional view of the feed cylinder in an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the feeding mechanism structure in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the feeding mechanism from another perspective in an embodiment of the present invention.

[0027] The labels in the diagram represent: 1. Moving mold; 101. Molding column; 102. Limiting groove; 103. Mounting block; 104. Molding cavity; 105. Slide groove; 106. Ejector rod; 2. Fixed mold; 3. Fixed seat; 4. Positioning mechanism; 41. Molding seat; 42. Positioning hole; 43. Push rod; 44. Magnetic block; 45. Mounting frame; 5. Feed cylinder; 6. Electric push rod; 7. Air pipe; 8. Pushing mechanism; 81. Sealing plate; 82. Positioning rod; 83. Positioning seat; 84. Conical cap; 85. First elastic element; 801. Conical cylinder; 802. Second elastic element; 803. Moving seat; 804. Conical block; 805. Limiting rail; 9. Mounting ring; 10. Liquid outlet; 11. Liquid inlet pipe; 12. Fixed frame; 13. Connecting ring; 14. Partition plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] The present invention will be further described below with reference to embodiments.

[0030] Example 1:

[0031] Please see Figures 1-8 This invention provides a technical solution: a mold release device for injection molding of plastic products, comprising a moving mold 1 and a fixed mold 2. The fixed mold 2 is a hollow structure containing a release agent. A feed cylinder 5 is provided inside the fixed mold 2. An air pipe 7 and a liquid inlet pipe 11 are respectively connected to the feed cylinder 5. A pushing mechanism 8 is provided inside the feed cylinder 5. The pushing mechanism 8 includes a sealing plate 81, which is slidably connected inside the feed cylinder 5. A positioning rod 82 is fixedly connected to the sealing plate 81. The positioning rod 82 and the sealing plate 81 are elastically connected inside the feed cylinder 5. A conical cap 84 is fixedly connected to the end of the positioning rod 82. A conical cylinder 801 that cooperates with the conical cap 84 is slidably connected inside the feed cylinder 5. A liquid outlet hole 10 that cooperates with the conical cylinder 801 is provided on the feed cylinder 5.

[0032] In specific implementation: The feed cylinder 5 and the liquid inlet pipe 11 are set up to cooperate. The liquid inlet pipe 11 sprays the release agent into the cavity of the fixed mold 2 through the feed cylinder 5, thereby facilitating demolding and preventing the product from sticking to the cavity after molding. After the release agent is sprayed, gas is transported into the feed cylinder 5 through the air pipe 7, and then the gas flows out through the liquid outlet 10, thereby quickly drying the release agent in the cavity of the fixed mold 2, thereby improving the demolding efficiency. During demolding, gas can also be introduced to separate the product from the cavity, avoiding negative pressure that causes the product to stick to the cavity of the fixed mold 2 and make demolding impossible.

[0033] Please see Figures 6-8 The present invention provides a technical solution: the pushing mechanism 8 further includes a positioning seat 83, the positioning seat 83 is fixedly connected inside the feeding cylinder 5, and a first elastic element 85 is connected between the positioning seat 83 and the sealing plate 81.

[0034] In specific implementation: the positioning seat 83 is used to install the positioning rod 82 to ensure the stability of the movement trajectory of the positioning rod 82, and the first elastic element 85 is a spring that can reset the sealing plate 81.

[0035] Please see Figures 6-8 The present invention provides a technical solution: a conical block 804 that cooperates with a conical cap 84 is fixedly connected to the conical cylinder 801, a movable seat 803 is fixedly connected to the conical cylinder 801, an installation ring 9 is fixedly connected inside the feed cylinder 5, and the movable seat 803 is slidably connected to the installation ring 9.

[0036] In practice: the cone block 804 is driven to move by the cone cap 84, which in turn drives the cone cylinder 801, which is fixedly connected to the cone cap 84, to move synchronously. The cone cylinder 801 then moves into the liquid outlet hole 10 to clean the liquid outlet hole 10 and prevent the liquid outlet hole 10 from being blocked by the dried release agent.

[0037] Please see Figures 6-8 The present invention provides a technical solution: a limiting rail 805 is fixedly connected to the mounting ring 9, the movable seat 803 is slidably connected to the limiting rail 805, and a second elastic element 802, which is a spring, is connected between the movable seat 803 and the feed cylinder 5.

[0038] In specific implementation: Under the action of wind, the pushing mechanism 8 first slides the sealing plate 81 inside the feeding cylinder 5. Since one end of the feeding cylinder 5 is conical, as the sealing plate 81 moves, a gap is formed between the sealing plate 81 and the feeding cylinder 5. The gas pushes the mold release agent inside the feeding cylinder 5 to move, thereby pushing the mold release agent into the cavity of the fixed mold 2. At the same time, the sealing plate 81 drives the positioning rod 82 to move synchronously, the first elastic element 85 is compressed, and the cone cap 84 drives the cone block 804 to move. The cone cap 84 and the cone block 804 cooperate to push the cone cylinder 801 along the limiting rail 805 towards... When the outlet hole 10 of the feed cylinder 5 moves in the direction of the discharge hole, the second elastic element 802 is compressed. After the cone cylinder 801 moves to the position of the discharge hole 10, it completely pushes out the release agent that may remain on the inner wall of the discharge hole 10, thus completing the unblocking and cleaning of the discharge hole 10. When the air pipe 7 stops supplying air, the sealing plate 81 resets under the elastic force of the first elastic element 85, and the cone cap 84 resets simultaneously and no longer squeezes the cone block 804. The moving seat 803 drives the cone cylinder 801 to reset under the elastic force of the second elastic element 802, and the discharge hole 10 is exposed again, which facilitates the normal delivery of the release agent or gas in the next cycle.

[0039] Second embodiment:

[0040] Please see Figures 3-5 The present invention provides a technical solution: a positioning mechanism 4 is provided on the moving mold 1 and the fixed mold 2. The positioning mechanism 4 includes a forming seat 41 slidably connected to the moving mold 1, and a push rod 43 corresponding to the forming seat 41 is fixedly connected to the fixed mold 2. The forming seat 41 is provided with a positioning hole 42 that cooperates with the push rod 43.

[0041] In specific implementation: the molded seat 41, push rod 43 and positioning hole 42 are configured to cooperate. When the mold is closed, the push rod 43 and positioning hole 42 cooperate to bring the two molded seats 41 together to form a cavity. When demolding, the push rod 43 gradually moves away from the positioning hole 42, thereby causing the two molded seats 41 to gradually move away from each other.

[0042] Please see Figure 3 The present invention provides a technical solution: two molding seats 41 are provided and slidably connected to both ends of the moving mold 1. The positioning mechanism 4 further includes a magnetic block 44, which is slidably connected inside the molding seat 41. An installation frame 45 containing the magnetic block 44 is fixedly connected inside the molding seat 41. The molding seat 41 is a hollow structure and is filled with coolant inside.

[0043] In practice: the molding seats 41 are moved away from each other under the action of the magnetic block 44. When the film is closed, the push rod 43 overcomes the magnetic force of the magnetic block 44 and brings the two molding seats 41 closer together. The coolant in the molding seat 41 can cool the product and make the product form as soon as possible.

[0044] Please see Figures 2-3 The present invention provides a technical solution: the fixed mold 2 has a groove that cooperates with the forming seat 41, the moving mold 1 is fixedly connected to the mounting block 103, the mounting block 103 is fixedly connected to the forming rod 101, and the forming rod 101 and the forming seat 41 are combined to form the shape of the product.

[0045] In practice: the molding rod 101 and the molding seat 41 are combined to form a complete cavity structure.

[0046] Please see Figures 6-7 The present invention provides a technical solution: a connecting ring 13 is fixedly connected to the outer wall of the feeding cylinder 5, a fixed frame 12 is slidably connected to the outer wall of the feeding cylinder 5, the fixed frame 12 is fixedly connected to the inner wall of the fixed mold 2, an electric push rod 6 is installed on the fixed frame 12, and the telescopic end of the electric push rod 6 is fixedly connected to the connecting ring 13.

[0047] In practice: the electric push rod 6, the fixed frame 12 and the connecting ring 13 are coordinated to extend the end of the feed cylinder 5 into the cavity of the fixed mold 2, so that the liquid outlet 10 at the end of the fixed mold 2 is located in the cavity, and the release agent is sprayed out from the liquid outlet 10. When the product is formed, the feed cylinder 5 is moved out of the cavity.

[0048] Please see Figure 5 , Figure 7 The present invention provides a technical solution: the air pipe 7 extends to the outside of the fixed mold 2, the air pipe 7 and the feed cylinder 5 are slidably connected, and the liquid outlet holes 10 on the feed cylinder 5 are distributed in a ring.

[0049] Please see Figures 2-3 The present invention provides a technical solution: the mounting block 103 is provided with a molding cavity 104, the molding rod 101 is fixedly connected to the molding cavity 104, the moving mold 1 is provided with a sliding groove 105, and the moving mold 1 is also provided with a limiting groove 102, the limiting groove 102 and the push rod 43 cooperate.

[0050] In specific implementation: the slide groove 105 is used to limit the molding seat 41, ensuring that the molding seat 41 slides back and forth along the slide groove 105. When the mold is closed, the push rod 43 is inserted into the limiting groove 102 to further position the push rod 43 and improve the mold closing accuracy.

[0051] Please see Figures 2-3 The present invention provides a technical solution: a fixed base 3 is fixedly connected to the fixed mold 2, a through hole is opened on the molding cavity 104, a push rod 106 is slidably connected in the through hole, the push rod 106 extends to the outside of the moving mold 1, a partition 14 is provided in the fixed base 3, and a release agent is placed in the cavity formed by the partition 14 and the fixed base 3.

[0052] In actual implementation:

[0053] After mold closing, injection molding is performed. After injection molding, the mold is opened after the product has solidified. The moving mold 1 moves the molding seat 41 away from the fixed mold 2. The push rod 43 on the fixed mold 2 gradually exits the positioning hole 42 on the molding seat 41. Under the repulsive magnetic force of the corresponding magnetic blocks 44, the two molding seats 41 slide along the slide groove 105 towards both ends of the moving mold 1, separating from the side wall of the product. At this time, by driving the ejector rod 106, the product molded on the mounting block 103 can be ejected to complete the demolding. The entire demolding process does not require additional complex drives, and the action is smooth and continuous. The limiting groove 102 and the push rod 43 are matched to coordinate with the movement of the push rod 43.

[0054] Please see Figure 5 The present invention provides a technical solution: a fixed base 3 is fixedly connected to the fixed mold 2, a through hole is opened on the molding cavity 104, a push rod 106 is slidably connected in the through hole, the push rod 106 extends to the outside of the moving mold 1, a partition 14 is provided in the fixed base 3, and the release agent is filled in the cavity formed by the partition 14 and the fixed base 3.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mold release device for injection molding of plastic products, comprising a moving mold (1) and a fixed mold (2), characterized in that, The moving mold (1) and the fixed mold (2) are provided with a positioning mechanism (4). The positioning mechanism (4) includes a molding seat (41) slidably connected to the moving mold (1). The fixed mold (2) is fixedly connected with a push rod (43) corresponding to the molding seat (41). The molding seat (41) is provided with a positioning hole (42) that cooperates with the push rod (43). The fixed mold (2) is a hollow structure containing a release agent. A feed cylinder (5) is provided inside the fixed mold (2). An air pipe (7) and a liquid inlet pipe (11) are respectively connected to the feed cylinder (5). A pusher mechanism (8) is provided inside the feed cylinder (5). The pusher mechanism (8) includes a sealing plate (81). The sealing plate (81) is slidably connected inside the feed cylinder (5). A positioning rod (82) is fixedly connected to the sealing plate (81). The positioning rod (82) and the sealing plate (81) are elastically connected inside the feed cylinder (5). The end of the positioning rod (82) is fixedly connected to a cone cap (84), and a cone cylinder (801) that cooperates with the cone cap (84) is slidably connected inside the feed cylinder (5). The feed cylinder (5) is provided with an outlet hole (10) that cooperates with the cone cylinder (801).

2. The mold release device for injection molding of plastic products according to claim 1, characterized in that: The molding base (41) has two parts and is slidably connected to both ends of the moving mold (1). The positioning mechanism (4) also includes a magnetic block (44), which is slidably connected inside the molding base (41). The molding base (41) is fixedly connected to a mounting frame (45) containing the magnetic block (44). The molding base (41) is a hollow structure and is filled with coolant.

3. The mold release device for injection molding of plastic products according to claim 1, characterized in that: The fixed mold (2) has a groove that mates with the forming seat (41). The moving mold (1) is fixedly connected to an mounting block (103). The mounting block (103) is fixedly connected to a forming rod (101). The forming rod (101) and the forming seat (41) are combined to form the shape of the product.

4. A mold release device for injection molding of plastic products according to claim 1, characterized in that: The feeding mechanism (8) also includes a positioning seat (83), which is fixedly connected inside the feeding cylinder (5), and a first elastic element (85) is connected between the positioning seat (83) and the sealing plate (81).

5. A mold release device for injection molding of plastic products according to claim 1, characterized in that: A conical block (804) that cooperates with a cone cap (84) is fixedly connected to the cone cylinder (801). A movable seat (803) is fixedly connected to the cone cylinder (801). An installation ring (9) is fixedly connected inside the feed cylinder (5). The movable seat (803) is slidably connected to the installation ring (9).

6. A mold release device for injection molding of plastic products according to claim 5, characterized in that: The mounting ring (9) is fixedly connected to a limiting rail (805), the movable seat (803) is slidably connected to the limiting rail (805), and a second elastic element (802) is connected between the movable seat (803) and the feed cylinder (5).

7. A mold release device for injection molding of plastic products according to claim 1, characterized in that: A connecting ring (13) is fixedly connected to the outer wall of the feed cylinder (5), and a fixed frame (12) is slidably connected to the outer wall of the feed cylinder (5). The fixed frame (12) is fixedly connected to the inner wall of the fixed mold (2). An electric push rod (6) is installed on the fixed frame (12), and the telescopic end of the electric push rod (6) is fixedly connected to the connecting ring (13).

8. A mold release device for injection molding of plastic products according to claim 1, characterized in that: The air pipe (7) extends to the outside of the fixed mold (2), and the air pipe (7) and the feed cylinder (5) are slidably connected. The liquid outlet holes (10) on the feed cylinder (5) are distributed in a ring.

9. A mold release device for injection molding of plastic products according to claim 3, characterized in that: The mounting block (103) has a molding cavity (104), the molding rod (101) is fixedly connected to the molding cavity (104), the moving mold (1) has a sliding groove (105), and the moving mold (1) also has a limiting groove (102), the limiting groove (102) and the push rod (43) cooperate.

10. A mold release device for injection molding of plastic products according to claim 9, characterized in that: A fixed seat (3) is fixedly connected to the fixed mold (2). A through hole is opened on the molding cavity (104). A push rod (106) is slidably connected in the through hole. The push rod (106) extends to the outside of the moving mold (1). A partition plate (14) is provided in the fixed seat (3). The release agent is placed in the cavity formed by the partition plate (14) and the fixed seat (3).

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