Leakage-proof sealing device for charging barrel of plastic injection molding machine
By incorporating a stepped structure and an inflatable seal between the barrel and the nozzle, the leakage problem at the connection between the barrel and the nozzle is solved, resulting in improved sealing performance and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU KINGMIRA TECH CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-05-15
AI Technical Summary
Tiny gaps at the connection between the barrel and nozzle of a plastic injection molding machine can cause material leakage and waste.
The barrel and nozzle are designed with a stepped structure, and inflatable seals and elastic fasteners are installed between them. The inflatable seals are used to adjust the sealing state by gas, and the elastic fasteners are used to increase the mechanical seal strength and flexible sealing effect.
It improves the sealing effect at the connection between the barrel and the nozzle, avoids raw material leakage, and enhances the sealing strength and service life.
Smart Images
Figure CN224240270U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic injection molding, and in particular to a leak-proof sealing device for the barrel of a plastic injection molding machine. Background Technology
[0002] The barrel (also known as the "machine barrel" or "heating barrel") of a plastic injection molding machine is one of the core components of the injection molding machine. It is responsible for heating, melting, and conveying solid plastic granules into the mold for shaping.
[0003] A nozzle is located at the discharge port at the lower end of the barrel. This nozzle connects to the inner cavity of the mold and is used to guide the molten material into the mold. The barrel and the nozzle are assembled together, so leakage is prone to occur at the connection point. Traditional seals are mainly based on a single mechanical seal, and there is still a small gap between the two, which causes drooling at the connection point, resulting in material waste.
[0004] Therefore, it is necessary to provide a new leak-proof sealing device for plastic injection molding machine barrels to solve the above-mentioned technical problems. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model provides a leak-proof sealing device for the barrel of a plastic injection molding machine.
[0006] The plastic injection molding machine barrel anti-leakage sealing device provided by this utility model includes a barrel body, a discharge port at the lower end of the barrel body, and a nozzle structure installed at the discharge port.
[0007] The lower end of the barrel body near the discharge port is stepped;
[0008] The nozzle structure includes a nozzle pipe, and the upper end of the nozzle pipe has an integrally connected guide shroud. The guide shroud is stepped and adapted to the lower half of the material cylinder body, so that the two are assembled and connected.
[0009] An inflatable seal is installed in the contact area between the barrel body and the flow guide shroud;
[0010] An elastic fastener is also fixed to the outside of the nozzle, and the elastic fastener abuts against the lower end face of the barrel body.
[0011] Preferably, a first open annular groove is formed on the inner wall of the barrel body and in the stepped area, while a second open annular groove is formed on the inner wall of the guide shroud and in the stepped area.
[0012] When the flow guide is installed inside the barrel body, the first open annular groove and the second open annular groove form a sealing annular groove.
[0013] Preferably, the inflatable seal includes an air tube, which is embedded and fixed inside the sealing ring groove, and an air nozzle for inflation is installed on the air tube, the air nozzle extending to the outside of the barrel body.
[0014] Preferably, the trachea is made of perfluoroether rubber, and the inner wall of the trachea has an inner support frame woven with aramid fibers, while the outer wall of the trachea is coated with a polyimide film.
[0015] Preferably, the trachea is filled with nitrogen.
[0016] Preferably, the elastic fastener includes two sets of clamps, which are sleeved on the outside of the nozzle and fixed by bolts to form an annular fixing frame. A baffle is welded and fixed to the upper end of the clamps.
[0017] A spring is also fitted outside the nozzle, with one end of the spring pressing against the baffle plate and the other end pressing against the lower end face of the material cylinder body.
[0018] Compared with related technologies, the leak-proof sealing device for plastic injection molding machine barrels provided by this utility model has the following advantages:
[0019] This utility model provides a leak-proof sealing device for a plastic injection molding machine barrel. The lower end of the barrel body and the guide cover are mutually adapted to each other in a stepped shape, which increases the mechanical seal strength and has a stronger sealing effect. At the same time, an inflatable sealing element is also provided between the two to increase the flexible material and improve the sealing effect, so as to avoid liquid leakage. Attached Figure Description
[0020] Figure 1 A schematic diagram of a preferred embodiment of the anti-leakage sealing device for the plastic injection molding machine barrel provided by this utility model;
[0021] Figure 2 This is a partial cross-sectional structural schematic diagram of the barrel body shown in this utility model;
[0022] Figure 3 This is a schematic diagram of the structure of the barrel body shown in this utility model;
[0023] Figure 4 This is a schematic diagram of the nozzle structure shown in this utility model;
[0024] Figure 5 This is a schematic diagram of the structure of the elastic fastener shown in this utility model;
[0025] Figure 6 This is a schematic diagram of the structure of the inflatable sealing element shown in this utility model.
[0026] The following are the labels in the diagram: 1. Barrel body; 11. First open annular groove; 2. Nozzle structure; 21. Spray pipe; 22. Flow guide; 23. Second open annular groove; 3. Elastic fastener; 31. Clamp; 32. Baffle; 33. Spring; 4. Inflatable seal; 41. Air pipe; 42. Air nozzle. Detailed Implementation
[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0028] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0031] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.
[0032] Please see Figures 1 to 6 The present invention provides a plastic injection molding machine barrel anti-leakage sealing device, which includes a barrel body 1, a discharge port at the lower end of the barrel body 1, and a nozzle structure 2 installed at the discharge port;
[0033] The lower end of the barrel body 1, near the discharge port, is stepped;
[0034] The nozzle structure 2 includes a nozzle 21, and the upper end of the nozzle 21 has an integrally connected guide shroud 22. The guide shroud 22 is stepped to fit the lower half of the material cylinder body 1, so that the two are assembled and connected.
[0035] An inflatable seal 4 is installed in the contact area between the barrel body 1 and the flow guide 22;
[0036] An elastic fastener 3 is also fixed to the outside of the nozzle 21, and the elastic fastener 3 abuts against the lower end face of the barrel body 1.
[0037] It should be noted that the lower end of the barrel body 1 is designed in a stepped shape, and the guide shroud 22 in the nozzle structure 2 is also stepped. Therefore, the guide shroud 22 can be assembled and installed inside the barrel body 1, thereby enabling multi-stage sealing, making the mechanical seal between the two have higher strength and better sealing effect.
[0038] An inflatable seal 4 is provided between the barrel body 1 and the flow guide 22. The inflatable seal 4 can be adjusted by filling it with gas, so as to better fill the gap between the barrel body 1 and the flow guide 22 and further improve the sealing performance of both.
[0039] An elastic fastener 3 is also fixed on the nozzle 21. The elastic fastener 3 presses against the lower end of the barrel body 1 and generates an elastic force on it, thereby generating a downward force on the nozzle 21 and the guide shroud 22, making the connection between the barrel body 1 and the guide shroud 22 more compact.
[0040] It should also be noted that the flow guide shroud 22 and the barrel body 1 are preferably fixed with bolts to ensure the connection strength between the two, while the added elastic fastener 3 is used for further reinforcement and can also play a buffering role when the equipment is in operation.
[0041] In the embodiments of this utility model, please refer to Figure 3 , Figure 4 and Figure 6 A first open annular groove 11 is provided on the inner wall of the barrel body 1 and in the stepped area, while a second open annular groove 23 is provided on the inner wall of the guide shroud 22 and in the stepped area; when the guide shroud 22 is installed inside the barrel body 1, the first open annular groove 11 and the second open annular groove 23 form a sealing annular groove.
[0042] Meanwhile, the inflatable seal 4 includes an air pipe 41, which is filled with nitrogen. The air pipe 41 is embedded and fixed inside the sealing ring groove. An air nozzle 42 for inflation is installed on the air pipe 41, and the air nozzle 42 extends to the outside of the barrel body 1.
[0043] The trachea 41 is made of perfluoroether rubber, and has an inner support frame woven with aramid fibers on its inner wall, while the outer wall of the trachea 41 is coated with a polyimide film.
[0044] It should be noted that the barrel body 1 and the flow guide shroud 22 are respectively provided with a first open annular groove 11 and a second open annular groove 23, which form a sealing annular groove after the assembly and fixing of the two are completed.
[0045] As for the inflatable seal 4, it includes an annular air tube 41, which can be embedded and fixed inside the sealing ring groove, and inert gases such as nitrogen are injected into it through the air nozzle 42, thereby adjusting the degree of expansion of the air tube 41 to enhance the sealing between the barrel body 1 and the guide shroud 22.
[0046] The air tube 41 has a frame woven from aramid fibers inside, which can enhance the pressure resistance of the air tube 41. Thus, when the material is pressurized and discharged inside the barrel body 1, the air tube 41 can withstand the increased pressure and improve its service life. At the same time, the air tube 41 is coated with a polyimide film on the outside, which can prevent the raw materials after they have melted from sticking.
[0047] In the embodiments of this utility model, please refer to Figure 2 and Figure 5 The elastic fastener 3 includes two sets of clamps 31. The two sets of clamps 31 are sleeved on the outside of the nozzle 21 and fixed by bolts to form an annular fixing frame. A baffle 32 is welded and fixed on the upper end of the clamps 31.
[0048] A spring 33 is also fitted outside the nozzle 21. One end of the spring 33 abuts against the baffle 32, and the other end abuts against the lower end face of the barrel body 1.
[0049] It should be noted that: in the elastic fastener 3, the two sets of clamps 31 are fixed to the nozzle 21 by bolts to ensure their stability. At the same time, a spring 33 is also sleeved on the nozzle 21. One end of the spring 33 abuts against the baffle 32 on the clamp 31, and the other end abuts against the lower end of the barrel body 1, so as to generate a downward force on the nozzle 21, making the connection between the barrel body 1 and the guide shroud 22 more compact.
[0050] When the clamp 31 is fixed at different positions on the nozzle 21, the spring 33 is compressed to different degrees, and thus has different elastic potential energy. The installation position of the clamp 31 can be adjusted according to the actual situation to ensure stable support for the nozzle structure 2.
[0051] The circuits and controls involved in this utility model are all existing technologies and will not be described in detail here.
[0052] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A leak-proof sealing device for a plastic injection molding machine barrel, comprising a barrel body (1), the lower end of the barrel body (1) having a discharge port, and a nozzle structure (2) installed at the discharge port, characterized in that: The lower end of the barrel body (1) near the discharge port is stepped; The nozzle structure (2) includes a nozzle (21), and the upper end of the nozzle (21) has an integrally connected guide shroud (22). The guide shroud (22) is stepped and adapted to the lower half of the material cylinder body (1) so that the two are assembled and connected. An inflatable seal (4) is installed in the contact area between the barrel body (1) and the flow guide (22); An elastic fastener (3) is also fixed to the outside of the nozzle (21), and the elastic fastener (3) abuts against the lower end face of the barrel body (1).
2. The leak-proof sealing device for the plastic injection molding machine barrel according to claim 1, characterized in that, A first open annular groove (11) is provided on the inner wall of the barrel body (1) and in the stepped area, while a second open annular groove (23) is provided on the inner wall of the flow guide (22) and in the stepped area. When the flow guide (22) is installed inside the barrel body (1), the first open annular groove (11) and the second open annular groove (23) form a sealing annular groove.
3. The leak-proof sealing device for the plastic injection molding machine barrel according to claim 1, characterized in that, The inflatable seal (4) includes an air pipe (41) which is embedded and fixed inside the sealing ring groove. An air nozzle (42) for inflation is installed on the air pipe (41) and extends to the outside of the barrel body (1).
4. The leak-proof sealing device for the plastic injection molding machine barrel according to claim 3, characterized in that, The trachea (41) is made of perfluoroether rubber. The inner wall of the trachea (41) has an inner support frame woven with aramid fibers, while the outer wall of the trachea (41) is coated with a polyimide film.
5. The leak-proof sealing device for the plastic injection molding machine barrel according to claim 4, characterized in that, Nitrogen gas is filled into the trachea (41).
6. The leak-proof sealing device for the plastic injection molding machine barrel according to claim 1, characterized in that, The elastic fastener (3) includes two sets of clamps (31). The two sets of clamps (31) are sleeved on the outside of the nozzle (21) and fixed by bolts to form an annular fixing frame. A baffle (32) is welded and fixed to the upper end of the clamps (31). A spring (33) is also fitted outside the nozzle (21). One end of the spring (33) abuts against the baffle (32), and the other end abuts against the lower end face of the barrel body (1).