Exhaust type injection mold based on non-destructive falling of injection molding nozzle

Abstract

The invention discloses an exhaust type injection mold based on non-destructive falling of an injection molding nozzle, and relates to the field of injection molds, the exhaust type injection mold specifically comprises a supporting frame and a plurality of first air cylinders vertically and fixedly arranged on the inner wall of the supporting frame, an upper mold is arranged at the bottoms of the first air cylinders, and a lower mold is fixedly arranged on the bottom wall, located under the upper mold, of the supporting frame; a demolding assembly for assisting demolding is arranged in the lower mold; according to the invention, the ox horn gate is arranged below the lower mold, so that an injection molding part is automatically separated from the gate during mold opening, and automatic injection of an oil release agent and ejection operation of the ejector pin are realized by controlling the movement of the cylinder II and the lifting plate, so that an oil layer is formed between the bottom of the injection molding part and the lower mold, and demolding is facilitated; and the risk that ejector pin traces are left on the surface of the injection molding part due to overlarge local stress during direct ejection of the ejector pin is reduced, the demolding quality and the surface smoothness of the injection molding part are improved, and demolding of the injection molding part can be accelerated through the oil demolding agent remaining in the lower mold.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and more particularly to a venting injection mold based on lossless shedding of an injection port. Background Art

[0002] In the injection mold technology of automotive headlight cover, traditional vented injection molds often face problems such as cumbersome injection port handling, difficult demoulding, and poor venting during the injection molding process. In other words, the injection port needs to be manually trimmed, which not only increases production processes and costs, but also may affect product quality. During the vented compression molding process, ejecting the molded part directly with an ejector pin is a common demolding method. However, strong adhesion between the molded part and the mold can lead to incomplete demolding or ejector pin marks, affecting the appearance quality of the molded part. Furthermore, it is not possible to form an "oil layer" on the contact surface between the molded part and the lower mold prior to demolding. This not only reduces the risk of ejector pin marks and allows for rapid demolding, but also prevents the "oil layer" from being used to prepare for the next demolding step. Therefore, a solution is proposed. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a venting injection mold based on lossless shedding of the injection port.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a venting injection mold based on lossless removal of the injection port, comprising a support frame and multiple groups of cylinders 1 vertically fixedly arranged on the inner wall thereof, an upper mold being arranged at the bottom of the cylinders 1, a lower mold being fixedly arranged on the bottom wall of the support frame directly below the upper mold, and a demolding assembly for assisting demolding being arranged inside the lower mold; The demoulding assembly includes multiple groups of oil filling holes opened above the lower mold, and oil blocking columns are slidably arranged inside the oil filling holes. A circular tube is also opened above the lower mold, and the circular tube is connected to the top of the oil filling hole through oil filling tube 2.

[0005] Furthermore, an oil main pipe is installed on the side wall of the lower mold, an oil injection pipe 1 is opened on the inner wall of the lower mold, and the top of the oil injection pipe 1 is connected to the circular tube, and the bottom of the oil injection pipe 1 is connected to the oil main pipe.

[0006] Furthermore, a plurality of groups of top holes are provided on the inner wall of the lower mold, and ejector pins are slidably provided inside the top holes, and a baffle is fixedly provided at the bottom of the ejector pins.

[0007] Furthermore, a thrust spring is sleeved on the outer wall of the ejector pin above the baffle plate, a connecting rod is fixedly provided at the bottom of the baffle plate, the bottom of the connecting rod is movable and passes through to the bottom of the top hole, and the connecting rod is connected to the upper circular plate and the lower circular plate from top to bottom on the outer wall below the lower mold.

[0008] Furthermore, a lifting plate is slidably arranged between the multiple groups of connecting rods, and the lifting plate is located between the upper circular plate and the lower circular plate. The bottom of the oil blocking column is movable through the bottom of the lower mold and is fixedly connected to the lifting plate, and the bottom of the lifting plate is fixedly connected to the support frame through cylinder 2.

[0009] Furthermore, multiple groups of circular arrays of oil injection holes are arranged above the lower mold, and multiple groups of circular arrays of top holes are arranged on the lower mold, and the oil injection holes are arranged close to the top holes.

[0010] Furthermore, a non-destructive fall-off part for non-destructive fall-off of the injection molded part is provided on one side of the lower mold, and the non-destructive fall-off part includes a glue injection hole opened inside the lower mold, and a movable column is slidingly provided inside the glue injection hole, and an electric push rod is fixedly provided on the bottom wall of the support frame directly below the movable column. The electric push rod is fixedly connected to the movable column, and a horn glue outlet is provided on the upper side wall of the glue injection hole.

[0011] Furthermore, the output end of the horn glue port is located at the die groove of the lower mold, and an air hole is opened on the bottom wall of the upper mold.

[0012] Furthermore, an upper connecting plate is fixedly provided on the bottom of the cylinder 1, and the upper connecting plate is fixedly connected to the upper mold.

[0013] Furthermore, an injection molding main pipe is inserted above the support frame, the bottom of the injection molding main pipe extends to the bottom of the upper connecting plate and is fixedly connected to two groups of U-shaped tubes, and the output ends of the U-shaped tubes are connected to their corresponding injection holes.

[0014] The technical effects and advantages of the present invention are as follows: The present invention controls the contraction of the extended end of the second air cylinder, and the lifting plate moves downward along multiple connecting rods, pulling the oil blocking column downward, and the top of the oil blocking column moves to the bottom of the second oil filling pipe, and injects oil release agent into the first oil filling pipe through the oil main pipe. The oil release agent enters the second oil filling pipe through the circular tube and then overflows along the top of the oil filling hole. The oil release agent overflows from multiple groups of oil filling holes at the same time, so that an "oil layer" is formed between the bottom of the injection molded part and the lower mold, which not only separates the bottom of the injection molded part from the lower mold first, but also further cools the bottom of the injection molded part to ensure that the bottom of the injection molded part is solidified.

[0015] The present invention controls the extended end of the second air cylinder to extend and push the upper circular plate upward, and the upper circular plate pushes the ejector pin and the oil blocking column to move upward, thereby ejecting the headlight cover shell of the automobile accessory. The "oil layer" is used to solidify the injection molded part, thereby reducing the risk of ejector pin marks being left on the surface of the injection molded part due to excessive local force when the ejector pin is directly ejected. The mold is quickly demoulded, adhesion is prevented, and the demoulding quality of the injection molded part is improved. The oil release agent remaining in the lower mold is used for demoulding optimization for the next injection molding.

[0016] The present invention provides a horn glue port under the lower mold so that the injection molded part is automatically separated from the gate when the mold is opened. By controlling the movement of the second cylinder and the lifting plate, the automatic injection of the oil release agent and the ejection operation of the ejector are realized. Not only an "oil layer" is formed between the bottom of the injection molded part and the lower mold to facilitate demolding, but also the risk of leaving ejector marks on the surface of the injection molded part due to excessive local force when the ejector is directly ejected is reduced, thereby improving the demolding quality and the surface finish of the injection molded part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the appearance of the overall structure of the present invention.

[0018] Figure 2 It is a front view of the overall structure of the present invention.

[0019] Figure 3 It is a three-dimensional diagram of the internal structure of the lower mold in the present invention.

[0020] Figure 4 It is a three-dimensional diagram of the outer structure of the lifting plate in the present invention.

[0021] Figure 5 It is a three-dimensional diagram of the outer structure of the top hole in the present invention.

[0022] Figure 6 It is a structural stereogram of the non-destructive shedding part in the present invention.

[0023] Figure 7 It is a cross-sectional view of the overall structure of the present invention.

[0024] Figure 8 This is a three-dimensional diagram showing the exhaust hole located above the upper mold.

[0025] The accompanying drawings are marked as follows: 1. Support frame; 2. Upper connecting plate; 3. Lower mold; 4. Cylinder 1; 5. Injection main pipe; 61. Cylinder 2; 62. Lifting plate; 63. Round tube; 64. Oil filling pipe 2; 65. Oil main pipe; 66. Oil filling hole; 67. Oil blocking column; 68. Oil filling pipe 1; 69. Ejector hole; 610. Thrust spring; 611. Baffle plate; 612. Connecting rod; 613. Upper circular plate; 614. Lower circular plate; 615. Ejector pin; 7. U-shaped tube; 8. Upper mold; 91. Electric push rod; 92. Movable column; 93. Glue injection hole; 94. Ox-horn glue port. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1: Please refer to Figures 1-8 As shown in the figure, if the adhesion between the injection molded part and the mold is strong during the demoulding process, it is easy to cause incomplete demoulding or leave ejector marks, affecting the appearance quality of the injection molded part. The following solution can be used to solve the problem; The venting injection mold based on non-destructive removal of the injection port in this embodiment includes a support frame 1 and multiple groups of cylinders 4 vertically fixedly arranged on the inner wall thereof. An upper mold 8 is arranged at the bottom of the cylinder 4. A lower mold 3 is fixedly arranged on the bottom wall of the support frame 1 directly below the upper mold 8. A demolding assembly for assisting demolding is arranged inside the lower mold 3. It should be noted that the vented injection mold has an internal cooling system, which is a prior art technology. It uses circulating water channels, oil cooling, or heat exchangers to control the mold temperature, accelerate melt solidification, and reduce warpage. The layout of the cooling water channels is optimized according to the shape, wall thickness, and material properties of the plastic part to ensure temperature uniformity. The demoulding assembly includes multiple groups of oil injection holes 66 provided above the lower mold 3. The multiple groups of oil injection holes 66 are arranged in a circular array above the lower mold 3. Oil blocking columns 67 are slidably provided inside the oil injection holes 66. A circular tube 63 is also provided above the lower mold 3. The circular tube 63 is connected to the top of the oil injection holes 66 through a second oil injection tube 64. See also Figure 3-Figure 6 As shown, an oil main pipe 65 is installed on the side wall of the lower mold 3, and an oil injection pipe 68 is opened on the inner wall of the lower mold 3. The top of the oil injection pipe 68 is connected to the circular tube 63, and the bottom of the oil injection pipe 68 is connected to the oil main pipe 65; After the injection molding, the control cylinder 1 4 moves upward, and the upper mold 8 is separated from the lower mold 3. At the same time, the extended end of the control cylinder 2 61 is first contracted, and the lifting plate 62 moves downward along the multiple connecting rods 612, and pulls the oil blocking column 67 downward. The top of the oil blocking column 67 moves to the bottom of the oil injection pipe 2 64, and the oil release agent is injected into the oil injection pipe 1 68 through the oil main pipe 65. The oil release agent enters the oil injection pipe 2 64 through the circular tube 63 and then overflows along the top of the oil injection hole 66. The oil release agent overflows from multiple groups of oil injection holes 66 at the same time, so that an "oil layer" is formed between the bottom of the injection molded part and the lower mold 3, which not only separates the bottom of the injection mold from the lower mold 3 first, but also further cools the bottom of the injection molded part to ensure that the bottom of the injection molded part is solidified. The inner wall of the lower mold 3 is further provided with a plurality of top holes 69, which are arranged in a circular array on the lower mold 3, and the oil injection hole 66 is arranged near the top hole 69. An ejector pin 615 is slidably provided inside the top hole 69, and a stop plate 611 is fixedly provided at the bottom of the ejector pin 615. A thrust spring 610 is sleeved on the outer wall of the ejector pin 615 above the stop plate 611. A connecting rod 612 is fixedly provided at the bottom of the stop plate 611. The bottom of the connecting rod 612 is movably extended to the bottom of the top hole 69. The connecting rod 612 is connected to an upper circular plate 613 and a lower circular plate 614 from top to bottom on the outer wall below the lower mold 3. The extended end of the rear control cylinder 61 extends to push the upper circular plate 613 upward, and the upper circular plate 613 pushes the ejector pin 615 and the oil blocking column 67 upward to eject the headlight cover housing of the automobile accessory. This reduces the risk of the ejector pin 615 leaving traces on the surface of the injection molded part due to excessive local force when the ejector pin 615 is directly ejected, and the mold is quickly demoulded to prevent adhesion, thereby improving the demoulding quality of the injection molded part. The oil release agent remaining in the lower mold 3 is used to optimize the demoulding for the next injection molding. A lifting plate 62 is slidably provided between the multiple groups of connecting rods 612. The lifting plate 62 is located between the upper circular plate 613 and the lower circular plate 614. The bottom of the oil blocking column 67 is movable and passes through the bottom of the lower mold 3 and is fixedly connected to the lifting plate 62. The bottom of the lifting plate 62 is fixedly connected to the support frame 1 through the second cylinder 61. Example 2: Traditional molds often face problems such as cumbersome injection port handling, difficult demoulding, and poor venting during the injection molding process. In other words, the injection port needs to be manually trimmed, which not only increases production processes and costs but also may affect product quality. The following solution can be used to solve these problems. A non-destructive shedding part is provided on one side of the lower mold 3 for non-destructive shedding of the injection molded part. The non-destructive shedding part includes a glue injection hole 93 provided inside the lower mold 3. A movable column 92 is slidably provided inside the glue injection hole 93. An electric push rod 91 is fixedly provided on the bottom wall of the support frame 1 just below the movable column 92. The electric push rod 91 is fixedly connected to the movable column 92. A horn glue port 94 is provided on the upper side wall of the glue injection hole 93, and the output end of the horn glue port 94 is located at the mold groove of the lower mold 3; That is, when the mold is opened, due to the shrinkage characteristics of the plastic at the glue mouth and the special geometric shape of the ox-horn glue mouth 94, a natural separation force can be formed between the injection molded part and the ox-horn glue mouth 94, achieving lossless separation of the ox-horn glue mouth 94, which belongs to the existing technology; See also Figure 8 As shown, the bottom wall of the upper mold 8 is provided with air holes for exhaust during injection molding, which effectively discharges the air in the cavity and the gas generated by the decomposition of the melt, thereby avoiding defects such as burning and gas marks caused by trapped air and improving the quality of the injection molded parts. See also Figure 1-Figure 2 As shown, an upper connecting plate 2 is fixedly provided at the bottom of the cylinder 1 4, and the upper connecting plate 2 is fixedly connected to the upper mold 8; By controlling the extension of the extended end of the second electric push rod 91, the injection molding material remaining inside the horn glue port 94 is cleaned out of the outside of the horn glue port 94. An injection molding main pipe 5 is inserted above the support frame 1. The bottom of the injection molding main pipe 5 extends to the bottom of the upper connecting plate 2 and is fixedly connected to two sets of U-shaped tubes 7. The output ends of the U-shaped tubes 7 are connected to the corresponding injection holes 93. In the present invention, it can be seen from the combination of Example 1 and Example 2 that: By providing a horn glue port 94 below the lower mold 3, the molded part is automatically separated from the gate when the mold is opened. By controlling the movement of the second cylinder 61 and the lifting plate 62, the automatic injection of the oil release agent and the ejection operation of the ejector pin 615 are realized. This not only forms an "oil layer" between the bottom of the molded part and the lower mold 3, facilitating demoulding, but also reduces the risk of the ejector pin 615 leaving traces on the surface of the molded part due to excessive local force when the ejector pin 615 is directly ejected, thereby improving the demoulding quality and the surface finish of the molded part. In addition, the oil release agent remaining in the lower mold 3 can accelerate the demoulding of the injection molded part. Working principle: When the present invention is in use, the control cylinder 1 4 is pushed downward to connect the lower mold 3 with the upper mold 8 to form an injection cavity. Then, the plastic slurry is injected into the two U-shaped tubes 7 through the injection main pipe 5. The plastic slurry enters the injection cavity through the horn glue port 94 and is formed; The design of the ox-horn glue nozzle 94 allows the product to be automatically separated from the glue nozzle when the mold is opened, eliminating the need for manual trimming of the glue nozzle, reducing production processes and improving production efficiency; After the injection molding, the control cylinder 1 4 moves upward, and the upper mold 8 is separated from the lower mold 3. At the same time, the extended end of the control cylinder 2 61 is first contracted, and the lifting plate 62 moves downward along the multiple connecting rods 612, and pulls the oil blocking column 67 downward. The top of the oil blocking column 67 moves to the bottom of the oil injection pipe 2 64, and the oil release agent is injected into the oil injection pipe 1 68 through the oil main pipe 65. The oil release agent enters the oil injection pipe 2 64 through the circular tube 63, and then overflows along the top of the oil injection hole 66. The oil release agent overflows from multiple groups of oil injection holes 66 at the same time, making An "oil layer" is formed between the bottom of the injection molded part and the lower mold 3, which not only separates the bottom of the injection mold from the lower mold 3 first but also further cools the bottom of the injection molded part to ensure that the bottom of the injection molded part is solidified. The extended end of the second control cylinder 61 then extends to push the upper circular plate 613 upward. The upper circular plate 613 pushes the ejector pin 615 and the oil blocking column 67 upward to eject the headlight cover housing of the automotive part. This reduces the risk of the ejector pin 615 leaving marks on the surface of the injection molded part due to excessive local force when the ejector pin 615 is directly ejected, and allows for rapid demoulding, preventing adhesion, and improving the demoulding quality of the injection molded part. When the ejector pin 615 pushes the molded part upward, the horn glue port 94 is automatically cut off when the mold is opened, and the glue port is not damaged, thereby reducing the risk of plastic melt leakage and the probability of flash generation of the molded part.

[0028] Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification in order to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An exhaust-type injection mold based on lossless shedding of the injection molding port, comprising a support frame (1) and a plurality of cylinder groups (4) vertically fixedly arranged on the inner wall thereof, characterized in that: An upper mold (8) is provided at the bottom of the cylinder 1 (4), a lower mold (3) is fixedly provided on the bottom wall of the support frame (1) directly below the upper mold (8), and a demoulding component for assisting demoulding is provided inside the lower mold (3); The demoulding assembly includes a plurality of oil injection holes (66) opened above the lower mold (3), and an oil blocking column (67) is slidably provided inside the oil injection hole (66). A circular tube (63) is also opened above the lower mold (3), and the circular tube (63) is connected to the top of the oil injection hole (66) through the second oil injection tube (64).

2. The venting injection mold based on lossless removal of the injection port according to claim 1, characterized in that: An oil main pipe (65) is installed on the side wall of the lower mold (3), and an oil injection pipe (68) is opened on the inner wall of the lower mold (3). The top of the oil injection pipe (68) is connected to the circular tube (63), and the bottom of the oil injection pipe (68) is connected to the oil main pipe (65).

3. The venting injection mold based on lossless removal of the injection port according to claim 2, characterized in that: The inner wall of the lower mold (3) is provided with a plurality of top holes (69), the interior of the top holes (69) is provided with a slidable ejector pin (615), and the bottom of the ejector pin (615) is fixedly provided with a baffle plate (611).

4. The venting injection mold based on lossless removal of the injection port according to claim 3, characterized in that: The ejector pin (615) is located on the outer wall above the retaining plate (611) and is sleeved with a thrust spring (610). A connecting rod (612) is fixedly provided at the bottom of the retaining plate (611). The bottom of the connecting rod (612) is movable and extends to the bottom of the top hole (69). The connecting rod (612) is located on the outer wall below the lower mold (3) and is connected to an upper circular plate (613) and a lower circular plate (614) from top to bottom.

5. The venting injection mold based on lossless removal of the injection port according to claim 4, characterized in that: A lifting plate (62) is slidably provided between the plurality of connecting rods (612), and the lifting plate (62) is located between the upper circular plate (613) and the lower circular plate (614). The bottom of the oil blocking column (67) is movable and passes through the bottom of the lower mold (3) and is fixedly connected to the lifting plate (62), and the bottom of the lifting plate (62) is fixedly connected to the support frame (1) through the second cylinder (61).

6. The venting injection mold based on lossless removal of the injection port according to claim 5, characterized in that: A plurality of groups of circular arrays of oil injection holes (66) are arranged above the lower mold (3), and a plurality of circular arrays of top holes (69) are arranged on the lower mold (3), with the oil injection holes (66) being arranged close to the top holes (69).

7. The venting injection mold based on lossless removal of the injection port according to claim 1, characterized in that: A non-destructive shedding piece for non-destructive shedding of the injection molded part is provided on one side of the lower mold (3), and the non-destructive shedding piece includes a glue injection hole (93) opened inside the lower mold (3), and a movable column (92) is slidably provided inside the glue injection hole (93). An electric push rod (91) is fixedly provided on the bottom wall of the support frame (1) directly below the movable column (92), and the electric push rod (91) is fixedly connected to the movable column (92). A horn glue opening (94) is provided on the upper side wall of the glue injection hole (93).

8. The venting injection mold based on lossless removal of the injection port according to claim 7, characterized in that: The output end of the ox horn glue port (94) is located at the die groove of the lower mold (3), and an air hole is opened on the bottom wall of the upper mold (8).

9. The venting injection mold based on lossless removal of the injection port according to claim 8, characterized in that: An upper connecting plate (2) is fixedly provided at the bottom of the cylinder 1 (4), and the upper connecting plate (2) is fixedly connected to the upper mold (8).

10. The venting injection mold based on lossless removal of the injection port according to claim 9, characterized in that: An injection molding main pipe (5) is inserted above the support frame (1), the bottom of the injection molding main pipe (5) extends to the bottom of the upper connecting plate (2) and is fixedly connected to two groups of U-shaped tubes (7), and the output ends of the U-shaped tubes (7) are connected to their corresponding injection holes (93).

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