Injection molding device and injection molding method

Abstract

The injection molding device comprises an injection molding table, the rear side of the injection molding table is connected with a hanging plate through a vertical plate, an injection molding liquid cylinder is arranged above the hanging plate, the bottom of the hanging plate is connected with an upper mold in a liftable mode, the upper mold comprises an upper fixing block, the bottom of the upper fixing block is rotationally connected with a circular cover plate, and the center of the bottom of the circular cover plate is coaxially connected with a circular column. A lower injection molding hole is formed in one side of the round cover plate, an upper injection molding hole and a blocking rod are arranged on the upper fixing block, and the upper injection molding hole is connected with an injection molding liquid cylinder through an injection molding pipe; a lower mold is detachably connected to the middle of the injection molding table and comprises a lower fixing block, a cylindrical hole is formed in the lower fixing block, and an annular plate and a bottom circular plate are connected into the cylindrical hole in a liftable mode; the annular plate and the bottom circular plate move upwards to push the injection molding cylinder out of the lower mold, so that the film is convenient to take; and by arranging the blocking rod, the blocking rod is inserted into the lower injection molding hole, the situation that protrusions exist in the positions, corresponding to the lower injection molding hole, of the injection molding barrel is avoided, time and labor are saved, and efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding, and in particular relates to an injection molding device and an injection molding method. Background Art

[0002] In the production process of plastic products such as packaging boxes, injection molding cylinders, etc., injection molding devices are generally used for molding. Figure 1 The injection molding cylinder shown includes an injection molding cylinder side wall, an injection molding cylinder bottom wall and an injection molding cylinder placement chassis that protrudes downward from the bottom of the injection molding cylinder. When injection molding this type of injection molding cylinder is produced, a lower mold and an upper mold are generally used. An injection molding cavity that conforms to the shape of the injection molding cylinder is directly opened on the lower mold. During injection molding, the injection liquid is injected into the injection molding cavity and then cooled and formed. After that, the injection molding cylinder is removed from the lower mold.

[0003] However, in the actual implementation process of the above-mentioned injection molding device, it is found that there are areas that need to be improved: after the injection molding is completed, when the injection molding cylinder is demolded, the injection molding cylinder needs to be picked out from the lower mold, which is relatively laborious and inconvenient to operate; in addition, there is a protrusion on the injection molding hole that extends into the injection molding hole. After the injection molding is completed, the protrusion on the injection molding cylinder needs to be cut and polished, which is relatively time-consuming and labor-intensive. Summary of the invention

[0004] In view of the deficiencies and defects in the prior art, the purpose of the present invention is to provide an injection molding device and an injection molding method, which solves the problem that when the injection molding device in the prior art demolds the injection molding cylinder, it is necessary to pick the injection molding cylinder out of the lower mold, which is relatively laborious; and the injection molding hole is prone to have a protrusion on the injection molding cylinder that extends into the injection molding hole, and after the injection molding is completed, the protrusion needs to be cut and polished, which is relatively time-consuming and labor-intensive.

[0005] In order to solve the above technical problems, the present invention adopts the following technical scheme: an injection molding device, used for injection molding an injection molding cylinder, comprising an injection molding table, the rear side of the injection molding table is connected to a hanging plate through a vertical plate, an injection molding liquid cylinder is arranged above the hanging plate, the injection molding liquid cylinder is filled with injection molding liquid, the bottom of the hanging plate is connected to an upper mold by a first telescopic rod and can be lifted and lowered, the upper mold comprises an upper fixed block, the bottom of the upper fixed block is rotatably connected to a circular cover plate, the bottom center of the circular cover plate is coaxially connected to a circular column, the length of the circular column is the same as the length of the inner wall of the injection molding cylinder, a lower injection molding hole is arranged on one side of the circular cover plate, an upper injection molding hole and a blocking rod that can be aligned with the lower injection molding hole are arranged on the upper fixed block, an injection molding valve is arranged at the bottom of the injection molding liquid cylinder, and the upper injection molding hole is provided on the upper fixed block. The plastic hole is connected to the injection liquid cylinder through an injection tube, and the blocking rod is liftably arranged in the upper fixed block, and the diameter of the blocking rod is the same as the diameter of the lower injection hole; the middle part of the injection molding platform is detachably connected to a lower mold, and the lower mold includes a lower fixed block, and a cylindrical hole is opened on the lower fixed block. An annular plate is liftably connected to the cylindrical hole through a second telescopic rod, and a bottom circular plate is liftably connected to the cylindrical hole through a third telescopic rod. The outer diameter of the bottom circular plate is larger than the diameter of the circular column and smaller than the diameter of the cylindrical hole, and the bottom circular plate is located below the annular plate, and the outer diameter of the annular plate, the diameter of the cylindrical hole, and the diameter of the circular cover plate are all the same as the outer diameter of the injection molding cylinder, and the inner diameter of the annular plate and the diameter of the circular column are all the same as the inner diameter of the injection molding cylinder.

[0006] As a further improvement of the present invention, the thickness of the annular plate is the same as the height at which the injection molding cylinder is placed on the chassis.

[0007] As a further improvement of the present invention, a cooling device capable of cooling the lower mold and the injection molding cylinder is also provided on the lower fixed block or the injection molding table.

[0008] As a further improvement of the present invention, a circle of cold air cavity is provided on the outer side of the cylindrical hole on the lower fixing block, and the cold air cavity is connected to the cold air fan through an air duct.

[0009] As a further improvement of the present invention, the cold air cavity is provided with an air hole communicating with the bottom of the cylindrical hole, the air hole is provided with an air valve, and the circular column is provided with a gas sensor capable of detecting gas.

[0010] As a further improvement of the present invention, a second mounting hole corresponding to the second telescopic rod and a third mounting hole corresponding to the third telescopic rod are provided on the lower fixed block below the cylindrical hole, the body of the second telescopic rod is fixed in the second mounting hole, and the body of the third telescopic rod is fixed in the third mounting hole.

[0011] As a further improvement of the present invention, an insertion hole is provided at the bottom of the upper fixed block at the position where the blocking rod is arranged, and the blocking rod is connected and arranged in the insertion hole through an electric push rod.

[0012] As a further improvement of the present invention, a mounting cavity is provided in the upper fixing block, a motor is fixed in the mounting cavity, and an output shaft of the motor extends out of the mounting cavity and is connected to the cover plate.

[0013] An injection molding method using an injection molding device for injection molding comprises the following steps:

[0014] (1) Adjustment of mold: Rotate the circular cover plate to align the lower injection hole with the upper injection hole; Move the annular plate upward so that the upper end of the annular plate extends out of the cylindrical hole; Move the upper mold downward, and during this process, after the annular plate contacts the circular cover plate, it moves downward together with the circular cover plate until the upper mold covers the lower mold; Move the bottom circular plate upward until the upper end of the bottom circular plate contacts the circular column;

[0015] (2) Adding injection liquid: Open the injection valve and move the annular plate slowly downward. The upper part of the annular plate, the outer wall of the circular column, the inner wall of the cylindrical hole and the circular cover plate form a first flow injection zone. During the downward movement of the annular plate, the gas in the cylindrical hole is pushed downward. At the same time, the injection liquid flows into the first flow injection zone to form the side wall of the injection cylinder.

[0016] The annular plate continues to move downward, and after the annular plate contacts the bottom circular plate, the bottom circular plate moves downward together with the annular plate until the vertical distance between the plane on the annular plate and the bottom of the circular column is equal to the thickness of the bottom wall of the injection molding cylinder. At this time, the upper part of the annular plate, the upper part of the bottom circular plate, the inner wall of the cylindrical hole, the outer wall of the circular column and the circular cover plate enclose a second flow injection molding area, and the injection molding liquid flows into the second flow injection molding area until the injection molding liquid fills the second flow injection molding area to form a complete injection molding cylinder; close the injection molding valve, rotate the circular cover plate to align the circular cover plate with the blocking rod, and move the blocking rod downward until the bottom of the blocking rod is flush with the bottom of the lower injection molding hole;

[0017] (3) Injection molding: The injection molding liquid in the second flow injection molding zone is naturally cooled until the injection molding cylinder is injection-molded and cooled;

[0018] (4) Turn on the cooling fan, which blows cold air into the cold air chamber, lowers the temperature of the cold air chamber, and cools and shrinks the lower mold and the injection molding cylinder, so that a gap is generated between the lower mold and the injection molding cylinder to facilitate demolding of the lower mold and the injection molding cylinder; then, move the bottom circular plate downward to complete the separation and demolding of the bottom circular plate and the injection molding cylinder;

[0019] (5) Then, the annular plate is moved downward to complete the demolding between the injection molding cylinder and the annular plate or the injection molding cylinder and the upper mold, and then the annular plate, the bottom circular plate, and the upper mold are moved upward to remove the injection molding cylinder from the lower mold; then, the annular plate and the bottom circular plate are moved downward again to pull the injection molding cylinder off the upper mold plate, completing the film removal process.

[0020] As a further improvement of the present invention, between step (4) and step (5), the following steps are also included: opening the air valve, and inputting cold air into the bottom of the cylindrical hole through the cold air chamber. The cold air blown into the bottom of the cylindrical hole helps to separate the injection molding cylinder and the annular plate, and is used to preliminarily detect whether the injection molding cylinder is leaking. That is, when the gas sensor detects gas, it preliminarily indicates that the external gas can enter the injection molding cylinder, and there is a possibility that the injection molding cylinder has a leak, thereby strengthening subsequent detection; otherwise, it indicates that there is no leak in the injection molding cylinder and the injection molding cylinder is preliminarily qualified.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. By setting an injection molding table, an injection molding cylinder, an upper mold and a lower mold, the upper mold is set to a structure of an upper fixed block, a round cover plate and a round column, and the lower mold is set to a structure of a lower fixed block, a cylindrical hole, a liftable annular plate and a liftable bottom round plate,

[0023] When molding, first extend the annular plate out of the cylindrical hole, and then move the upper mold downward. During this process, after the annular plate encounters the circular cover plate, it descends together with the circular cover plate until the upper mold covers the lower mold, and then the annular plate is slowly moved downward, and then the injection liquid is added to the closed first flow injection molding area surrounded by the circular cover plate, the annular plate, the circular column and the cylindrical hole. Because the annular plate first contacts the circular cover plate on the outside and then enters the cylindrical hole, and then in the cylindrical hole, the annular plate is moved downward to separate from the circular cover plate. During the downward movement of the annular plate in the cylindrical hole, the air in the cylindrical hole is pushed downward, completing the separation of the first flow injection molding area from the outside air, ensuring the relative vacuum in the first flow injection molding area (the air in the first flow injection molding area is greatly reduced).

[0024] The annular plate continues to move downward until it meets the bottom circular plate, and then the bottom circular plate and the annular plate continue to move downward for a certain distance. During this process, the annular plate and the bottom circular plate continue to push the air in the cylindrical hole downward. At this time, the closed second flow injection molding area surrounded by the circular cover plate, the annular plate, the bottom circular plate, the circular column and the cylindrical hole, the space of the second flow injection molding area is the model of the injection molding cylinder. During this process, the second flow injection molding area is separated from the outside air to ensure the relative vacuum in the second flow injection molding area (the air in the second flow injection molding area is greatly reduced), the second flow injection molding area is filled with injection liquid, and then cooled, so as to reduce the air content in the injection molding liquid during the injection molding process, thereby reducing the bubbles on the injection molding cylinder after molding, and improving the molding injection molding quality and qualified rate of the injection molding cylinder;

[0025] In addition, the annular plate and the bottom circular plate can remove and scrape the foreign particles on the outer wall of the circular column and the inner wall of the cylindrical hole during the downward injection molding process, and keep the outer wall of the circular column and the inner wall of the cylindrical hole clean, thereby ensuring the cleanliness of the injection molding cylinder, avoiding impurities in the injection molding cylinder, and improving the quality of the injection molding cylinder;

[0026] Third, the matching setting of the annular plate and the bottom circular plate, after the annular plate and the bottom circular plate are overlapped, the annular plate and the bottom circular plate form an offset, that is, the gap between the upper plane of the bottom circular plate and the plane of the annular plate can form an injection molding area for placing the injection molding cylinder on the chassis, that is, the injection molding of the injection molding cylinder on the chassis is completed.

[0027] Fourth, the matching setting of the annular plate and the bottom circular plate, after the injection cylinder is formed, move the annular plate and the bottom circular plate upward, the annular plate and the bottom circular plate can push the injection cylinder out of the lower mold, complete the demoulding of the injection cylinder and the lower mold, and then, remove the injection cylinder from the circular column, which is convenient for film removal.

[0028] In summary, the coordinated arrangement of the annular plate and the bottom circular plate can complete multiple functions synchronously or step by step, and the structure is simple and compact, which greatly improves the functionality and utilization of the structure and improves the overall efficiency;

[0029] In addition, by rotating the circular cover plate and the upper fixed block, and setting a blocking rod, after the injection liquid is added, the circular cover plate is rotated so that the lower injection hole on the circular cover plate is staggered with the upper injection hole on the upper fixed block, so as to prevent the injection liquid from continuing to drip into the lower injection hole and reduce the protrusion of the injection liquid in the injection hole. In addition, after rotating the circular cover plate, the lower injection hole is aligned with the blocking rod, and then the blocking rod is inserted into the lower injection hole to prevent the injection liquid from protruding upward at the lower injection hole, avoiding the presence of a protrusion at the position corresponding to the lower injection hole on the injection cylinder, avoiding the presence of a protrusion at the lower injection hole on the injection cylinder in the prior art, and the trouble of needing to deal with the protrusion later, saving time and effort, and improving efficiency. In addition, when the circular cover plate rotates, it will drive the circular column to rotate, which will relatively drive the improvement of the fluidity of the injection liquid in the second flow injection zone, further reduce the air in the injection liquid, reduce the bubble content of the molded injection cylinder, and improve the molding quality of the injection cylinder.

[0030] 2. By providing a cooling device on the lower fixed block or the injection molding table that can cool the lower mold and the injection molding cylinder, firstly, the cooling of the injection molding liquid can be accelerated during the injection molding process to improve the molding efficiency; secondly, after injection molding, the cooling temperature can be increased to further cool the injection molding cylinder and the lower mold, so that the injection molding cylinder and the lower mold are cooled and shrunk, which helps to create a gap between the injection molding cylinder and the lower mold, and facilitates the demoulding of the injection molding cylinder and the lower mold.

[0031] 3. By setting a cold air cavity on the lower fixed block, the cold air cavity is connected to the cold air blower through an air duct. The setting of the cold air cavity is convenient for large-scale cooling of the injection molding cylinder periphery over a large area. Secondly, it helps the inner wall of the lower fixed block to shrink toward the side of the cold air cavity, which helps to separate the inner wall of the lower fixed block from the outer wall of the injection molding cylinder, thereby facilitating demoulding. By setting an air hole connected to the bottom of the cylindrical hole on the cold air cavity, an air valve is set on the air hole, and a gas sensor is set on the circular column, therefore, after the injection molding cylinder is formed, the bottom circular plate is moved downward, and the air valve can be opened to inject cold air into the bottom of the cylindrical hole. The cold air penetrates into the outer side of the injection molding cylinder in the cylindrical hole, which helps to separate and demould the injection molding cylinder from the annular plate and the inner wall of the cylindrical hole. In addition, the injection molding cylinder can be preliminarily tested for leaks. If the gas sensor on the circular column detects gas, it is preliminarily indicated that the injection molding cylinder is leaking, and the subsequent injection molding cylinder leak test is increased. If the gas sensor on the circular column does not detect gas, it is preliminarily indicated that the injection molding cylinder is not leaking.

[0032] 4. By providing an installation cavity in the upper fixed block, a motor is fixed in the installation cavity, and the output shaft of the motor is connected to the cover plate. After starting the motor, the motor drives the circular cover plate to rotate, so that the lower injection hole is aligned with the upper injection hole, or the lower injection hole is aligned with the blocking rod.

[0033] 5. An injection molding method using an injection molding device, wherein the annular plate first extends out of the cylindrical hole and contacts the circular cover plate, and then enters the cylindrical hole together, and then the annular plate is moved downward, so that the first flow injection molding area forms a relative vacuum state, and the annular plate continues to be moved downward, and after the annular plate contacts the bottom circular plate, the bottom circular plate moves downward together with the annular plate, so that the second flow injection molding area also forms a relative vacuum state throughout the whole process, reducing the gas in the flow injection molding area, thereby reducing the bubbles in the injection molding cylinder; in addition, while adding injection liquid to the first flow injection molding area or the second flow injection molding area, the annular plate and the bottom circular plate are moved downward, and the first flow injection molding area is gradually expanded to eventually become the second flow injection molding area, thereby reducing the residual space between the first flow injection molding area and the second flow injection molding area during injection molding, and further reducing the gas content in the injection molding liquid, thereby reducing the bubbles in the injection molding cylinder and improving the quality of the injection molding cylinder.

[0034] In addition, when the annular plate moves downward to expand the first flow injection zone, the outer wall of the circular column and the inner wall of the cylindrical hole can be cleaned synchronously, thereby reducing impurities in the injection cylinder during injection molding.

[0035] In addition, the cooling fan is first turned on to cool down the injection cylinder and the lower mold to shrink them, so that the injection cylinder and the cylindrical hole are initially demolded, and then the annular plate is moved upward to eject the injection cylinder from the lower mold, avoiding or reducing the large wear between the injection cylinder and the cylindrical hole caused by the hard ejection of the injection cylinder, and maintaining the aesthetic appearance of the injection cylinder. When demolding the injection cylinder, the injection cylinder is first ejected from the lower mold to expose the entire injection cylinder, and then the injection cylinder is pulled off the circular column to facilitate the removal of the injection cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings:

[0037] Figure 1 It is a structural schematic diagram of the injection molding cylinder;

[0038] Figure 2 It is a structural schematic diagram of the present invention;

[0039] Figure 3 for Figure 2 Section Figure 1 (The upper mold is not covered on the lower mold, and the annular plate extends out of the cylindrical hole);

[0040] Figure 4 for Figure 3 A magnified view at point A;

[0041] Figure 5 for Figure 2 Section Figure 2 (The state during the injection molding process from the upper mold cover to the lower mold);

[0042] Figure 6 The schematic diagram of the structure of the upper mold (the circular cover plate and the upper fixing block are separated);

[0043] In the figure: 1. injection molding table; 2. hanging plate; 3. injection molding cylinder; 31. injection molding cylinder side wall; 32. injection molding cylinder placement chassis; 4. injection molding liquid cylinder; 5. first telescopic rod; 6. upper mold; 61. upper fixing block; 62. round cover plate; 63. circular column; 64. lower injection molding hole; 65. upper injection molding hole; 66. blocking rod; 67. insertion hole; 68. mounting cavity; 69. motor; 7. lower mold; 71. lower fixing block; 72. cylindrical hole; 73. second telescopic rod; 74. annular plate; 75. bottom circular plate; 76. third telescopic rod; 77. gas sensor; 78. third mounting hole; 8. cold air cavity; 9. air hole; 10. injection molding tube; 12. electric push rod; 13. vertical plate. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-6 The present invention is further described in detail. For a clearer illustration, only the structures related to the inventive point of the present invention are shown in the figure.

[0045] For the convenience of description, the coordinate system is defined as Figure 2 As shown, the left-right direction is the horizontal direction, the front-back direction is the longitudinal direction, and the up-down direction is the vertical direction.

[0046] The embodiment of the present invention discloses an injection molding device for injection molding an injection molding cylinder 3. For the injection molding cylinder 3, as shown in FIG. Figure 1 As shown, it is cylindrical, and mainly includes an injection molding cylinder side wall 31, an injection molding cylinder bottom wall 3 and an injection molding cylinder placement chassis 32 below the bottom of the injection molding cylinder 3. An injection molding device, such as Figure 2 , Figure 3 and Figure 5 As shown, it includes an injection molding table 1, the rear side of the injection molding table 1 is fixedly connected to a hanging plate 2 through a vertical plate 13, an injection molding cylinder 3 is fixed above the hanging plate 2, an injection molding liquid cylinder 4 is filled with injection molding liquid, and an injection molding valve is provided at the bottom of the injection molding liquid cylinder 4 for opening or closing the discharge port of the injection molding cylinder 3. A heating wire (not shown in the figure) or other heating mechanism is wound and fixed on the side wall of the injection molding cylinder 3 to keep the injection molding liquid in a hot melt state.

[0047] like Figure 2 , Figure 3 and Figure 5 As shown, the bottom of the hanging plate 2 is connected to the upper mold 6 via a first telescopic rod 5, and the first telescopic rod 5 can be an electric push rod or a pneumatic push rod. Figure 3 and Figure 4 As shown, the upper mold 6 includes an upper fixed block 61, and a circular cover plate 62 is rotatably connected to the bottom of the upper fixed block 61. Specifically, a mounting cavity 68 is provided in the upper fixed block 61, and a motor 69 is fixed in the mounting cavity 68. The output shaft of the motor 69 extends out of the mounting cavity 68 and is connected to the cover plate. After the motor 69 is started, the motor 69 drives the circular cover plate 62 to rotate. A circular column 63 is coaxially connected and fixed to the bottom center of the circular cover plate 62. The length of the circular column 63 is the same as the length of the inner wall of the injection cylinder 3. The length of the inner wall of the injection cylinder 3 refers to the net size between the upper plane of the bottom wall of the injection cylinder 3 and the top of the injection cylinder 3. Figure 4 and Figure 6 As shown, a lower injection hole 64 is provided on one side of the circular cover plate 62, and the lower injection hole 64 avoids the circular column 63. An upper injection hole 65 and a blocking rod 66 that can be aligned with the lower injection hole 64 are provided on the upper fixing block 61. Figure 2 As shown, the upper injection hole 65 is connected to the injection liquid cylinder 4 through the injection tube 10, and the injection tube 10 is a hose, and the outer side of the injection tube 10 is wrapped with a heat preservation film. Figure 6As shown, after the circular cover plate 62 is rotated, the lower injection hole 64 can be aligned with the upper injection hole 65, or the lower injection hole 64 can be aligned with the blocking rod 66. The blocking rod 66 can be raised and lowered in the upper fixed block 61, and the diameter of the blocking rod 66 is the same as the diameter of the lower injection hole 64, or slightly smaller than the diameter of the lower injection hole 64; specifically, an insertion hole 67 is provided at the bottom of the upper fixed block 61 at the position where the blocking rod 66 is set, and the blocking rod 66 is connected and set in the insertion hole 67 through the electric push rod 12. In the retracted state, the blocking rod 66 can be completely retracted in the insertion hole 67. When adding the injection liquid, adjust the circular cover plate 62 so that the lower injection hole 64 of the circular cover plate 62 is aligned with the upper injection hole 65 of the upper fixed block 61. After the injection liquid is added, rotate the circular cover plate 62 so that the lower injection hole 64 of the circular cover plate 62 is aligned with the blocking rod 66, and then the blocking rod 66 extends into the lower injection hole 64.

[0048] like Figure 2 , Figure 3 and Figure 5 As shown, the middle part of the injection molding table 1 is detachably connected with a lower mold 7. Specifically, a clamping hole can be provided on the injection molding table 1, and the lower mold 7 is clamped in the clamping hole and connected with a locking bolt.

[0049] like Figure 3 , Figure 4 and Figure 5 As shown, the lower mold 7 includes a lower fixed block 71, and a cylindrical hole 72 is formed on the lower fixed block 71. An annular plate 74 is connected to the cylindrical hole 72 in a manner of lifting and lowering through three second telescopic rods 73. The thickness of the annular plate 74 is the same as the height of the injection cylinder placed on the bottom plate 32. A bottom circular plate 75 is connected to the cylindrical hole 72 in a manner of lifting and lowering through a third telescopic rod 76. The outer diameter of the bottom circular plate 75 is larger than the diameter of the circular column 63 and smaller than the diameter of the cylindrical hole 72, and the bottom circular plate 75 is located below the annular plate 74. The outer diameter of the annular plate 74, the diameter of the cylindrical hole 72, and the diameter of the circular cover plate 62 are all the same as the outer diameter of the injection cylinder 3, and the inner diameter of the annular plate 74 and the diameter of the circular column 63 are all the same as the inner diameter of the injection cylinder 3. In addition, in order to improve the sealing performance between the annular plate 74 and the cylindrical hole 72 and the circular column 63, a sealing ring (not shown in the drawings) can be provided on both the inner and outer sides of the annular plate 74. In addition, in order to improve the sealing performance and reduce the leakage of the injection liquid, a sealing ring is also provided on the outer side of the circular cover plate 62. The sealing ring is heat-resistant, and the heat-resistant temperature of the sealing ring is higher than the temperature of the injection liquid.

[0050] like Figure 3As shown, the second telescopic rod 73 and the third telescopic rod 76 can be electric push rods, and when set, a second mounting hole (not shown in the drawings) corresponding to the second telescopic rod 73 and a third mounting hole 78 corresponding to the third telescopic rod 76 can be provided on the lower fixing block 71 below the cylindrical hole 72, and the body of the second telescopic rod 73 is fixed in the second mounting hole, and the body of the third telescopic rod 76 is fixed in the third mounting hole 78. The first telescopic rod 5, the second telescopic rod 73 and the third telescopic rod 76 can be electric push rods, hydraulic push rods or pneumatic push rods.

[0051] In addition, if Figure 5 As shown, a cooling device capable of cooling the lower mold 7 and the injection tube 3 is also provided on the lower fixed block 71 or the injection molding table 1. By providing the cooling device, firstly, the cooling of the injection liquid can be accelerated during the injection molding process to improve the molding efficiency; secondly, after the injection molding, the cooling temperature can be increased to further cool the injection tube 3 and the lower mold 7, so that the injection tube 3 and the lower mold 7 are cooled and shrunk, which helps to generate a gap between the injection tube 3 and the lower mold 7, and facilitates the demoulding of the injection tube 3 and the lower mold 7.

[0052] The cooling device may adopt a water-cooling device or an air-cooling device commonly used in the prior art. For example, in this embodiment, a circle of cold air cavity 8 is provided on the outer side of the cylindrical hole 72 on the lower fixed block 71. The cold air cavity 8 is connected to a cold air machine (not shown in the figure) through an air duct (not shown in the figure). The connection setting method of the cold air cavity 8, the air duct (not shown in the figure) and the cold air machine can adopt the connection structure commonly used in the prior art. The cold air machine is arranged outside the lower fixed block 71. In addition, if Figure 5 As shown, the lower fixed block 71 is also provided with a wind pressure hole 14 that enables the outside world to communicate with the cold air chamber 8. A pressure valve (not shown in the figure) is provided on the wind pressure hole 14. When the pressure valve detects that the pressure in the cold air chamber 8 is too high, the wind pressure hole 14 opens to discharge the gas in the cold air chamber 8, forming an air convection cycle. The setting of the cold air chamber 8 is convenient for large-scale cooling of the injection molding cylinder 3 around a large area, and secondly, it helps the inner wall of the lower fixed block 71 to shrink toward the cold air chamber side, which helps to separate the inner wall of the lower fixed block 71 from the outer wall of the injection molding cylinder 3, thereby facilitating demoulding.

[0053] In addition, if Figure 3As shown, the cold air chamber 8 is provided with an air hole 9 communicating with the bottom of the cylindrical hole 72, and the air hole 9 is provided with an air valve, and the circular column 63 is provided with a gas sensor 77 capable of detecting gas. Therefore, after the injection molding cylinder 3 is formed, the bottom circular plate 75 is moved downward, and the air valve can be opened to inject cold air into the bottom of the cylindrical hole 72, and the cold air penetrates into the outside of the injection molding cylinder 3 in the cylindrical hole 72, which is helpful for the separation and demoulding of the injection molding cylinder 3 from the annular plate 74 and the inner wall of the cylindrical hole 72. In addition, the injection molding cylinder 3 can be subjected to a preliminary leak test. If the gas sensor 77 on the circular column 63 detects gas, it is preliminarily indicated that the injection molding cylinder 3 is leaking, and the subsequent injection molding cylinder 3 leak test is increased. If the gas sensor 77 on the circular column 63 does not detect gas, it is preliminarily indicated that the injection molding cylinder 3 is not leaking.

[0054] The technical principle and technical effect of an injection molding device of the present invention are as follows: an injection molding table 1, an injection molding cylinder 3, an upper mold 6 and a lower mold 7 are arranged, and the upper mold 6 is arranged to have a structure of an upper fixed block 61, a circular cover plate 62 and a circular column 63, and the lower mold 7 is arranged to have a structure of a lower fixed block 71, a cylindrical hole 72, a liftable annular plate 74 and a liftable bottom circular plate 75.

[0055] When molding, the annular plate 74 is first extended out of the cylindrical hole 72, and then the upper mold 6 is moved downward. During this process, the annular plate 74 descends together with the circular cover plate 62 after encountering the circular cover plate 62 until the upper mold 6 covers the lower mold 7. Then the annular plate 74 is slowly moved downward, and then the injection liquid is added to the closed first flow injection molding area surrounded by the circular cover plate 62, the annular plate 74, the circular column 63 and the cylindrical hole 72. Because the annular plate 74 first contacts the circular cover plate 62 on the outside and then enters the cylindrical hole 72, and then the annular plate 74 is moved downward in the cylindrical hole 72 to separate from the circular cover plate 62, the annular plate 74 moves downward in the cylindrical hole 72. The air in the cylindrical hole 72 is pushed downward during the downward movement of the annular plate 74, completing the separation of the first flow injection molding area from the outside air, ensuring the relative vacuum in the first flow injection molding area (the air in the first flow injection molding area is greatly reduced).

[0056] The annular plate 74 continues to move downward until it meets the bottom circular plate 75, and the bottom circular plate 75 continues to move downward for a certain distance with the annular plate 74. During this process, the annular plate 74 and the bottom circular plate 75 continue to push the air in the cylindrical hole 72 downward. At this time, the circular cover plate 62, the annular plate 74, the bottom circular plate 75, the circular column 63 and the cylindrical hole 72 form a closed second flow injection molding area. The space in the second flow injection molding area is the model of the injection molding cylinder 3. During this process, the second flow injection molding area is separated from the outside air to ensure a relative vacuum in the second flow injection molding area (the air in the second flow injection molding area is greatly reduced). The second flow injection molding area is filled with injection molding liquid and then cooled. The air content in the injection molding liquid is reduced throughout the injection molding process, thereby reducing the bubbles on the injection molding cylinder 3 after molding and improving the molding injection molding quality and qualified rate of the injection molding cylinder 3.

[0057] In addition, the annular plate 74 and the bottom circular plate 75 can remove and scrape the foreign particles on the outer wall of the circular column 63 and the inner wall of the cylindrical hole 72 during the downward injection molding process, and keep the outer wall of the circular column 63 and the inner wall of the cylindrical hole 72 clean, thereby ensuring the cleanliness of the injection cylinder 3, avoiding the inclusion of impurities in the injection cylinder 3, and improving the quality of the injection cylinder 3;

[0058] Third, the matching arrangement of the annular plate 74 and the bottom circular plate 75, after the annular plate 74 and the bottom circular plate 75 are overlapped, the annular plate 74 and the bottom circular plate 75 form an offset, that is, the gap between the upper plane of the bottom circular plate 75 and the upper plane of the annular plate 74 can form an injection molding area for placing the injection molding cylinder on the chassis 32, that is, the injection molding of the injection molding cylinder on the chassis 32 is completed.

[0059] Fourth, the matching setting of the annular plate 74 and the bottom circular plate 75, after the injection cylinder 3 is formed, the annular plate 74 and the bottom circular plate 75 are moved upwards, and the annular plate 74 and the bottom circular plate 75 can push the injection cylinder 3 out of the lower mold 7, completing the demoulding of the injection cylinder 3 and the lower mold 7, and then, the injection cylinder 3 can be removed from the circular column 63, which is convenient for removing the film.

[0060] In summary, the coordinated arrangement of the annular plate 74 and the bottom circular plate 75 can complete multiple functions synchronously or step by step, and the structure is simple and compact, which greatly improves the functionality and utilization of the structure and improves the overall efficiency;

[0061] In addition, by rotatably connecting the circular cover plate 62 with the upper fixed block 61 and providing a blocking rod 66, after the addition of the injection molding liquid is completed, the circular cover plate 62 is rotated so that the lower injection molding hole 64 on the circular cover plate 62 is staggered with the upper injection molding hole 65 on the upper fixed block 61, thereby preventing the injection molding liquid from continuing to drip into the lower injection molding hole 64 and reducing the protrusion of the injection molding liquid in the injection molding hole. In addition, after rotating the circular cover plate 62, the lower injection molding hole 64 is aligned with the blocking rod 66, and then the blocking rod 66 is inserted into the lower injection molding hole 64 to prevent the injection molding liquid from protruding upward at the lower injection molding hole 64, thereby avoiding the presence of a protrusion at the position corresponding to the lower injection molding hole 64 on the injection molding cylinder 3, and avoiding the trouble of having a protrusion at the lower injection molding hole 64 on the injection molding cylinder 3 in the prior art, thereby avoiding the trouble of having to deal with the protrusion later, thereby saving time and effort and improving efficiency. In addition, when the circular cover plate 62 rotates, the circular column 63 is driven to rotate, which will relatively increase the fluidity of the injection liquid in the second flow injection molding area, further reduce the air in the injection liquid, reduce the bubble content of the molding injection cylinder 3, and improve the molding quality of the injection cylinder 3.

[0062] The injection molding method using an injection molding device for injection molding comprises the following steps:

[0063] (1) Adjustment of mold alignment: Rotate the circular cover plate 62 to align the lower injection hole 64 with the upper injection hole 65; Move the annular plate 74 upward so that the upper end of the annular plate 74 extends out of the cylindrical hole 72; Move the upper mold 6 downward, and in this process, after the annular plate 74 contacts the circular cover plate 62, it moves downward together with the circular cover plate 62 until the upper mold 6 covers the lower mold 7; Move the bottom circular plate 75 upward until the upper end of the bottom circular plate 75 contacts the circular column 63;

[0064] (2) Adding injection liquid: Open the injection valve and simultaneously slowly move the annular plate 74 downward. The upper part of the annular plate 74, the outer wall of the circular column 63, the inner wall of the cylindrical hole 72 and the circular cover plate 62 form a first flow injection zone. During the downward movement of the annular plate 74, the gas in the cylindrical hole 72 is pushed downward. At the same time, the injection liquid flows into the first flow injection zone to form the side wall 31 of the injection cylinder.

[0065] The annular plate 74 continues to move downward. After the annular plate 74 contacts the bottom circular plate 75, the bottom circular plate 75 moves downward together with the annular plate 74 until the vertical distance between the upper plane of the annular plate 74 and the bottom of the circular column 63 is equal to the thickness of the bottom wall of the injection molding cylinder 3. At this time, the upper part of the annular plate 74, the upper part of the bottom circular plate 75, the inner wall of the cylindrical hole 72, the outer wall of the circular column 63 and the circular cover plate 62 enclose a second flow injection molding area. The injection molding liquid flows into the second flow injection molding area until the injection molding liquid fills the second flow injection molding area to form a complete injection molding cylinder 3. Close the injection molding valve, rotate the circular cover plate 62, align the circular cover plate 62 with the blocking rod 66, and move the blocking rod 66 downward until the bottom of the blocking rod 66 is flush with the bottom of the lower injection molding hole 64.

[0066] (3) Injection molding: The injection molding liquid in the second flow injection molding zone is naturally cooled until the injection molding cylinder 3 is injection-molded and cooled;

[0067] (4) Turn on the cooling fan, which blows cold air into the cold air chamber 8, so that the temperature of the cold air chamber 8 decreases, and the lower mold 7 and the injection cylinder 3 cool and shrink, so that a gap is generated between the lower mold 7 and the injection cylinder 3 to facilitate demolding of the lower mold 7 and the injection cylinder 3; then, move the bottom circular plate 75 downward to complete the separation and demolding of the bottom circular plate 75 and the injection cylinder 3;

[0068] (5) Afterwards, the annular plate 74 is moved downward to complete the demolding between the injection cylinder 3 and the annular plate 74 or the injection cylinder 3 and the upper mold 6, and then the annular plate 74, the bottom circular plate 75, and the upper mold 6 are moved upward to remove the injection cylinder 3 from the lower mold 7; then the annular plate 74 and the bottom circular plate 75 are moved downward again to pull the injection cylinder 3 off the upper mold plate, completing the film removal process.

[0069] In addition, for further optimization, the following steps are included between step (4) and step (5): open the air valve, and the cold air chamber 8 inputs cold air to the bottom of the cylindrical hole 72. The cold air blown into the bottom of the cylindrical hole 72 helps to separate the injection molding cylinder 3 and the annular plate 74, and is used to preliminarily detect whether the injection molding cylinder 3 is leaking. That is, when the gas sensor 77 detects gas, it preliminarily indicates that the external gas can enter the injection molding cylinder 3, and there is a possibility that the injection molding cylinder 3 has a leak point, thereby strengthening subsequent detection; otherwise, it indicates that there is no leak point in the injection molding cylinder 3, and the injection molding cylinder 3 is preliminarily qualified.

[0070] In addition, in step (3), the cooling device can also be turned on to cool the lower mold 7 to accelerate the cooling and molding speed of the injection liquid.

[0071] The technical effect of the injection molding method using an injection molding device is as follows: by using an injection molding method using an injection molding device, the annular plate 74 first extends out of the cylindrical hole 72 and contacts the circular cover plate 62, and then enters the cylindrical hole 72 together, and then moves the annular plate 74 downward, so that the first flow injection molding area forms a relative vacuum state, and continues to move the annular plate 74 downward. After the annular plate 74 contacts the bottom circular plate 75, the bottom circular plate 75 moves downward together with the annular plate 74, so that the second flow injection molding area also forms a relative vacuum state throughout the whole process, reducing the gas in the flow injection molding area, thereby reducing the bubbles in the injection molding cylinder 3; in addition, while adding injection liquid to the first flow injection molding area or the second flow injection molding area, the annular plate 74 and the bottom circular plate 75 are moved downward, and the first flow injection molding area is gradually expanded to eventually become the second flow injection molding area, reducing the residual space between the first flow injection molding area and the second flow injection molding area during injection molding, and further reducing the gas content in the injection molding liquid, thereby reducing the bubbles in the injection molding cylinder 3 and improving the quality of the injection molding cylinder 3.

[0072] In addition, when the annular plate 74 moves downward to expand the first flow injection zone, it can simultaneously complete the cleaning of the outer wall of the circular column 63 and the inner wall of the cylindrical hole 72, thereby reducing impurities in the injection cylinder 3 during injection molding.

[0073] In addition, the cooling fan is first turned on to cool down the injection cylinder 3 and the lower mold 7 to shrink them, so that the injection cylinder 3 and the cylindrical hole 72 are initially demolded, and then the annular plate 74 is moved upward to eject the injection cylinder 3 from the lower mold 7, thereby avoiding or reducing the large wear between the injection cylinder 3 and the cylindrical hole 72 caused by the hard ejection and separation of the injection cylinder 3, and maintaining the aesthetic appearance of the injection cylinder 3. When the injection cylinder 3 is demolded, the injection cylinder 3 is first ejected from the lower mold 7, so that the injection cylinder 3 is fully exposed, and then the injection cylinder 3 is pulled off the circular column 63 to facilitate the removal of the injection cylinder 3.

[0074] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. It should be understood that the specific embodiments described herein are only used to understand the present invention and are not used to limit the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. An injection molding device for injection molding an injection molding cylinder, comprising an injection molding table, the rear side of the injection molding table is connected to a hanging plate through a vertical plate, an injection molding liquid cylinder is arranged above the hanging plate, and the injection molding liquid cylinder is filled with injection molding liquid, characterized in that: The bottom of the hanging plate is connected to an upper mold by a first telescopic rod in a liftable manner, and the upper mold includes an upper fixed block, a circular cover plate is rotatably connected to the bottom of the upper fixed block, a circular column is coaxially connected to the bottom center of the circular cover plate, the length of the circular column is the same as the length of the inner wall of the injection molding cylinder, a lower injection hole is provided on one side of the circular cover plate, an upper injection hole and a blocking rod that can be aligned with the lower injection hole are provided on the upper fixed block, an injection valve is provided at the bottom of the injection molding liquid cylinder, the upper injection hole is connected to the injection molding liquid cylinder through an injection molding tube, the blocking rod is liftably arranged in the upper fixed block, and the diameter of the blocking rod is the same as the diameter of the lower injection molding hole. The holes have the same diameter; a lower mold is detachably connected to the middle part of the injection molding table, the lower mold includes a lower fixed block, a cylindrical hole is opened on the lower fixed block, an annular plate is liftably connected to the cylindrical hole through a second telescopic rod, a bottom circular plate is liftably connected to the cylindrical hole through a third telescopic rod, the outer diameter of the bottom circular plate is larger than the diameter of the circular column and smaller than the diameter of the cylindrical hole, and the bottom circular plate is located below the annular plate, the outer diameter of the annular plate, the diameter of the cylindrical hole, and the diameter of the circular cover plate are all the same as the outer diameter of the injection molding cylinder, and the inner diameter of the annular plate and the diameter of the circular column are all the same as the inner diameter of the injection molding cylinder.

2. An injection molding device according to claim 1, characterized in that: The thickness of the annular plate is the same as the height at which the injection molding cylinder is placed on the chassis.

3. An injection molding device according to claim 1, characterized in that: A cooling device capable of cooling the lower mold and the injection molding cylinder is also provided on the lower fixed block or the injection molding table.

4. An injection molding device according to claim 3, characterized in that: A circle of cold air cavity is arranged on the outer side of the cylindrical hole on the lower fixing block, and the cold air cavity is connected with the cold air machine through an air duct.

5. An injection molding device according to claim 4, characterized in that: The cold air cavity is provided with an air hole which is communicated with the bottom of the cylindrical hole, the air hole is provided with an air valve, and the circular column is provided with a gas sensor which can detect gas.

6. An injection molding device according to claim 1, characterized in that: The lower fixing block is provided with a second mounting hole corresponding to the second telescopic rod and a third mounting hole corresponding to the third telescopic rod below the cylindrical hole. The body of the second telescopic rod is fixed in the second mounting hole, and the body of the third telescopic rod is fixed in the third mounting hole.

7. An injection molding device according to claim 1, characterized in that: An insertion hole is provided at the bottom of the upper fixed block at the position where the blocking rod is arranged, and the blocking rod is connected and arranged in the insertion hole through an electric push rod.

8. An injection molding device according to claim 1, characterized in that: A mounting cavity is provided in the upper fixing block, a motor is fixed in the mounting cavity, and an output shaft of the motor extends out of the mounting cavity and is connected to the cover plate.

9. An injection molding method using an injection molding device as claimed in claim 1, characterized in that: The method comprises the following steps: (1) adjusting the mold: rotating the circular cover plate so that the lower injection hole is aligned with the upper injection hole; moving the annular plate upward so that the upper end of the annular plate extends out of the cylindrical hole; moving the upper mold downward, and in this process, after the annular plate contacts the circular cover plate, it moves downward together with the circular cover plate until the upper mold covers the lower mold; moving the bottom circular plate upward until the upper end of the bottom circular plate contacts the circular column; (2) Adding injection liquid: Open the injection valve and move the annular plate slowly downward. The upper part of the annular plate, the outer wall of the circular column, the inner wall of the cylindrical hole and the circular cover plate form a first flow injection zone. During the downward movement of the annular plate, the gas in the cylindrical hole is pushed downward. At the same time, the injection liquid flows into the first flow injection zone to form the side wall of the injection cylinder. The annular plate continues to move downward, and after the annular plate contacts the bottom circular plate, the bottom circular plate moves downward together with the annular plate until the vertical distance between the plane on the annular plate and the bottom of the circular column is equal to the thickness of the bottom wall of the injection molding cylinder. At this time, the upper part of the annular plate, the upper part of the bottom circular plate, the inner wall of the cylindrical hole, the outer wall of the circular column and the circular cover plate enclose a second flow injection molding area, and the injection molding liquid flows into the second flow injection molding area until the injection molding liquid fills the second flow injection molding area to form a complete injection molding cylinder; close the injection molding valve, rotate the circular cover plate to align the circular cover plate with the blocking rod, and move the blocking rod downward until the bottom of the blocking rod is flush with the bottom of the lower injection molding hole; (3) Injection molding: The injection molding liquid in the second flow injection molding zone is naturally cooled until the injection molding cylinder is injection-molded and cooled; (4) Turn on the cooling fan, which blows cold air into the cold air chamber, lowers the temperature of the cold air chamber, and cools and shrinks the lower mold and the injection molding cylinder, so that a gap is generated between the lower mold and the injection molding cylinder to facilitate demolding of the lower mold and the injection molding cylinder; then, move the bottom circular plate downward to complete the separation and demolding of the bottom circular plate and the injection molding cylinder; (5) Then, the annular plate is moved downward to complete the demolding between the injection molding cylinder and the annular plate or the injection molding cylinder and the upper mold, and then the annular plate, the bottom circular plate, and the upper mold are moved upward to remove the injection molding cylinder from the lower mold; then, the annular plate and the bottom circular plate are moved downward again to pull the injection molding cylinder off the upper mold plate, completing the film removal process.

10. The method for performing injection molding using an injection molding device according to claim 9, characterized in that: Between step (4) and step (5), the following steps are also included: opening the air valve, and inputting cold air into the bottom of the cylindrical hole through the cold air chamber. The cold air blown into the bottom of the cylindrical hole helps to separate the injection molding cylinder and the annular plate, and is used to preliminarily detect whether the injection molding cylinder is leaking. That is, when the gas sensor detects gas, it preliminarily indicates that the external gas can enter the injection molding cylinder, and there is a possibility that the injection molding cylinder has a leak, and subsequent detection is strengthened; otherwise, it indicates that there is no leak in the injection molding cylinder and the injection molding cylinder is preliminarily qualified.

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