Leak-proof injection molding head of injection molding machine

Abstract

The utility model discloses a leakproof injection molding head of an injection molding machine, which comprises a connecting pipe, a circular filter plate and a conical nozzle which are sequentially and fixedly connected, the connecting pipe, the circular filter plate and the conical nozzle are coaxial, and the outer side surface of the connecting pipe is provided with external threads which can be connected and mounted on the injection molding machine. A plurality of square filtering holes are evenly formed in the circular filtering plate around the axis of the circular filtering plate, a plurality of circular cavities are evenly formed in the circular filtering plate around the axis of the circular filtering plate, square through holes communicating with the interiors of the square filtering holes are formed in one sides of the circular cavities, and square sliding columns are slidably inserted into the square through holes; a piston connected with one end of the square sliding column is arranged in the circular cavity in a sliding mode, the square sliding column is sleeved with a spring, the two ends of the spring are connected with the piston and one side of the circular cavity respectively, and an air conveying structure capable of conveying air into the circular cavity is arranged on the circular cavity. The utility model has the following advantages and effects: the effects of preventing raw materials from leaking and filtering the raw materials are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to an injection molding head of an injection molding machine which is leak-proof. Background Art

[0002] The injection molding machine is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting materials. The injection head is an indispensable and important component of the injection molding machine. The injection molding machine heats the plastic and aligns and pressurizes it, so that the plastic solution flows to the injection head, and then injects it into the mold to produce finished plastic parts. However, at present, after the plunger machine completes the injection molding and the injection head is separated from the mold, the hot-melt raw materials inside the barrel will easily flow out and leak from the injection head. Once the waiting time is too long, the raw materials will harden, which will not only cause the hardened raw materials to accumulate and cause the injection head outlet to be blocked, but also the raw materials that harden into small lumps and do not cause blockage will be injected and integrated into the next part together with the subsequent raw materials, thereby affecting the molding quality of the part. Utility Model Content

[0003] The utility model aims to provide an injection molding head of an injection molding machine which is leak-proof and has the effects of preventing leakage of raw materials and filtering raw materials.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions: an injection molding head for an injection molding machine that prevents leakage, comprising a connecting pipe, a circular filter plate and a conical nozzle that are fixedly connected in sequence, the connecting pipe, the circular filter plate and the conical nozzle are coaxial, and the diameter of the circular filter plate is larger than the connecting pipe, the outer side of the connecting pipe is provided with an external thread that can be connected and installed on the injection molding machine, the circular filter plate is evenly provided with a plurality of square filter holes that connect the connecting pipe and the conical nozzle around its axis, the circular filter plate is evenly provided with a plurality of circular cavities that are aligned with one side of the square filter hole around its axis, the circular cavity is provided with a square through hole that connects the inside of the square filter hole near the side of the square filter hole, and the width of the square through hole is consistent with the width of the square filter hole, a square slide column is slidably inserted in the square through hole, and a piston connected to one end of the square slide column is slidably arranged in the circular cavity, a spring is sleeved on the square slide column, and the two ends of the spring are respectively connected to the piston and one side of the circular cavity, and the circular cavity is provided with a gas supply structure that can supply gas to the inside of each circular cavity.

[0005] The utility model is further configured as follows: the gas delivery structure includes an gas delivery pipe fixed to the outer wall of the circular filter plate, a gas delivery channel 1 opened in the circular filter plate and connected to the adjacent circular cavity, and a delivery channel 2 opened in the circular filter plate and connected to the gas delivery pipe and a delivery channel 1, the gas delivery channel 1 connecting the air vent of the circular cavity close to the side of the circular cavity away from the square filter hole, and the piston is located between the air vent and the square through hole and moves.

[0006] The utility model is further configured as follows: four corners of the square through hole and the square sliding column are respectively provided with matching chamfers.

[0007] The utility model is further configured as follows: a circular support column is fixedly arranged on one side of the piston away from the square sliding column, the diameter of the circular support column is smaller than the piston, and one end of the circular support column can be pressed against one side of the circular cavity.

[0008] The beneficial effect of the utility model is that by adopting the above technical scheme, when the injection head and the mold are separated, firstly, the external air pump or other air-inflating equipment will automatically inject air into the air delivery pipe, and then the air injected into the delivery pipe will pass through the delivery pipe 2 and the delivery pipe 1, enter each circular cavity, and push the piston in the circular cavity to move toward the direction close to the square through hole, and in the movement process of the piston, not only the spring will be compressed, but also the square slide column will be pushed to slide out of the square through hole, until the end of the square slide column and one side of the square filter hole contact each other, due to the width of the square through hole and the square The widths of the square filter holes are consistent, so the square slide column sliding in the square through hole will close the square filter hole at this time to prevent a large amount of raw material in the barrel from leaking out of the plunger head, thereby avoiding the problem of hardened raw material accumulation blocking the outlet of the injection molding head. Finally, when the plunger head works again, the above-mentioned air pump and other inflatable equipment will stop supplying air to the circular cavity. At the same time, the spring will push the piston away from the square through hole in the process, which not only restores the initial position of the square slide column to open the square filter hole, but also cooperates with the piston to squeeze out the excess gas in the circular cavity, thereby preparing for the next round of leakage prevention work. Among them, the square filter holes on the circular filter plate can not only filter out impurities in the raw materials during the operation of the injection plug head, but also block the raw materials that harden into small pieces before the plunger head works in the connecting pipe to prevent the subsequent raw materials from entering the template cavity together, thereby affecting the molding quality of the parts; the chamfers of the square through holes and the square slide columns can not only reduce the friction area between the square slide columns and the side walls of the square filter holes, but also ensure that the spring safety sleeve is installed on the square slide column; the circular support column on one side of the piston can stably limit the movement of the piston between the vent and the square through hole to ensure the stable realization of the above-mentioned automatic anti-leakage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1Schematic diagram of the three-dimensional structure of this embodiment;

[0011] Figure 2 is a cross-sectional view of the connecting pipe, circular filter plate and conical nozzle structure of this embodiment;

[0012] Figure 3 is a cross-sectional view of the circular filter plate structure of this embodiment;

[0013] In the figure, 1. connecting pipe; 2. circular filter plate; 21. square filter hole; 22. circular cavity; 23. square through hole; 24. gas pipe; 25. gas delivery channel 1; 26. delivery channel 2; 3. conical nozzle; 4. square sliding column; 5. piston; 6. spring; 7. circular support column. DETAILED DESCRIPTION

[0014] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] Embodiment: A leak-proof injection molding machine injection head, such as Figure 1-3 As shown, it includes a connecting pipe 1, a circular filter plate 2 and a conical nozzle 3 which are fixedly connected in sequence. The connecting pipe 1, the circular filter plate 2 and the conical nozzle 3 are coaxial, and the diameter of the circular filter plate 2 is larger than that of the connecting pipe 1. The outer side of the connecting pipe 1 is provided with an external thread which can be connected and installed on an injection molding machine. The circular filter plate 2 is evenly provided with a plurality of square filter holes 21 connecting the connecting pipe 1 and the conical nozzle 3 around its axis. The inside of the circular filter plate 2 is evenly provided with a plurality of circular cavities 22 aligned with one side of the square filter holes 21 around its axis. A square through hole 23 connected to the inside of the square filter hole 21 is provided on one side of the circular cavity 22 near the square filter hole 21, and the width of the square through hole 23 is consistent with the width of the square filter hole 21. A square slide column 4 is slidably inserted in the square through hole 23, and a piston 5 connected to one end of the square slide column 4 is slidably arranged in the circular cavity 22. A spring 6 is sleeved on the square slide column 4, and the two ends of the spring 6 are respectively connected to the piston 5 and one side of the circular cavity 22. The circular cavity 22 is provided with a gas supply structure that can supply gas to the inside of each circular cavity 22.

[0016] Among them, the gas transmission structure includes an air transmission pipe 24 fixed to the outer wall of the circular filter plate 2, an air transmission channel 25 opened in the circular filter plate 2 and connected to the adjacent circular cavity 22, and a delivery channel 2 26 opened in the circular filter plate 2 and connected to the air transmission pipe 24 and a delivery channel 1. The air transmission channel 1 25 connects the air vent of the circular cavity 22 close to the side of the circular cavity 22 away from the square filter hole 21, and the piston 5 is located between the air vent and the square through hole 23 and moves; the four corners of the square through hole 23 and the square slide column 4 are respectively provided with matching chamfers; a circular support column 7 is fixedly arranged on the side of the piston 5 away from the square slide column 4, the diameter of the circular support column 7 is smaller than that of the piston 5, and one end can be against one side of the circular cavity 22.

[0017] The working principle of this embodiment:

[0018] When the injection head is separated from the mold, first, the external air pump or other air-inflating equipment will automatically inject air into the air delivery pipe 24, and then the air injected into the delivery pipe will pass through the delivery pipe 2 and the delivery pipe 1, enter each circular cavity 22, and push the piston 5 in the circular cavity 22 to move toward the square through hole 23. During the movement of the piston 5, not only the spring 6 will be compressed, but also the square slide column 4 will be pushed to slide out of the square through hole 23 until the end of the square slide column 4 contacts one side of the square filter hole 21. Since the width of the square through hole 23 is the same as the width of the square filter hole 21, Therefore, the square slide column 4 sliding in the square through hole 23 will close the square filter hole 21 at this time to prevent a large amount of raw material in the barrel from leaking out of the plunger head, thereby avoiding the problem of hardened raw material accumulation blocking the outlet of the injection molding head. Finally, when the plunger head works again, the above-mentioned inflation equipment such as the air pump will stop supplying air to the circular cavity 22. At the same time, the spring 6 will push the piston 5 away from the square through hole 23 in this process, not only restoring the initial position of the square slide column 4 to open the square filter hole 21, but also cooperating with the piston 5 to squeeze out the excess gas in the circular cavity 22, thereby preparing for the next round of leakage prevention work. Among them, the square filter holes 21 on the circular filter plate 2 can not only filter out impurities in the raw materials during the operation of the injection plug head, but also block the raw materials that have hardened into small pieces before the injection plug head works in the connecting tube 1, so as to prevent the raw materials thereafter from entering the template cavity together, thereby affecting the molding quality of the parts; the chamfers of the square through holes 23 and the square slide column 4 can not only reduce the friction area between the square slide column 4 and the side walls of the square filter holes 21, but also ensure that the spring 6 is safely mounted on the square slide column 4; the circular support column 7 on one side of the piston 5 can stably limit the piston 5 to move between the vent and the square through hole 23, so as to ensure the stable realization of the above-mentioned automatic anti-leakage effect.

Claims

1. A leak-proof injection molding machine injection head, comprising a connecting pipe (1), a circular filter plate (2) and a conical nozzle (3) which are fixedly connected in sequence, wherein the connecting pipe (1), the circular filter plate (2) and the conical nozzle (3) are coaxial, and the diameter of the circular filter plate (2) is larger than that of the connecting pipe (1), and the outer side surface of the connecting pipe (1) is provided with an external thread which can be connected and installed on the injection molding machine, characterized in that: The circular filter plate (2) is evenly provided with a plurality of square filter holes (21) connected to the connecting pipe (1) and the conical nozzle (3) around its axis. The circular filter plate (2) is evenly provided with a plurality of circular cavities (22) aligned with one side of the square filter hole (21) around its axis. A square through hole (23) connected to the inside of the square filter hole (21) is provided on the side of the circular cavity (22) close to the square filter hole (21). The width of the square through hole (23) is the same as the width of the square filter hole (21). A square slide column (4) is slidably inserted in the square through hole (23). A piston (5) connected to one end of the square slide column (4) is slidably arranged in the circular cavity (22). A spring (6) is sleeved on the square slide column (4). The two ends of the spring (6) are respectively connected to the piston (5) and one side of the circular cavity (22). The circular cavity (22) is provided with a gas supply structure capable of supplying gas to the inside of each circular cavity (22).

2. The anti-leakage injection molding head of an injection molding machine according to claim 1, characterized in that: The gas delivery structure comprises a gas delivery pipe (24) fixed to the outer wall of the circular filter plate (2), a gas delivery channel 1 (25) opened in the circular filter plate (2) and connected to the adjacent circular cavity (22), and a delivery channel 2 (26) opened in the circular filter plate (2) and connected to the gas delivery pipe (24) and the delivery channel 1, wherein the gas delivery channel 1 (25) is connected to the vent of the circular cavity (22) close to the side of the circular cavity (22) away from the square filter hole (21), and the piston (5) is located between the vent and the square through hole (23) and moves.

3. The anti-leakage injection molding head of an injection molding machine according to claim 1, characterized in that: The four corners of the square through hole (23) and the square sliding column (4) are respectively provided with matching chamfers.

4. The anti-leakage injection molding head of an injection molding machine according to claim 1, characterized in that: A circular support column (7) is fixedly provided on the side of the piston (5) facing away from the square slide column (4); the diameter of the circular support column (7) is smaller than that of the piston (5), and one end of the circular support column (7) can abut against one side of the circular cavity (22).

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