Anti-leakage injection head for injection molding machine

Abstract

The utility model discloses a leak-proof injection molding head for an injection molding machine, comprising an injection molding tube and an injection molding head, an annular sealing airbag is installed on the injection molding head, an annular groove is provided on the inner wall of the injection molding tube, an air cavity and a rotating cavity are provided inside the injection molding head, the air cavity is communicated with the annular sealing airbag, a piston plate is provided in the air cavity, a screw is provided for rotation in the rotating cavity, the piston plate is connected to the screw through a connection mechanism, a rotating groove is provided on the injection molding head, and the end of the screw extends into the rotating groove. During the installation process of the injection molding head, the utility model drives the piston plate to move through the rotation of the components, so that the gas in the air cavity is filled into the annular sealing airbag, so that the gas fully fills the annular groove, thereby achieving a good sealing effect, effectively preventing the leakage of the plastic melt during the injection molding process, thereby improving the quality of the injection molded product, reducing the waste of materials, and avoiding the production safety hazards that may be caused by leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a leakage-proof injection molding head for injection molding machines. Background Art

[0002] The leak-proof injection head for injection molding machines is an indispensable and extremely important component of injection molding machines. It plays a vital role in the entire injection molding process. Its core function is to effectively prevent the leakage of molten plastic during the injection molding process. During the injection molding operation, high temperatures are generated inside the injection molding machine to heat the plastic raw materials to a molten state. These hot and fluid molten plastics need to be accurately injected into the mold through precise channels and outlets to form the predetermined plastic products.

[0003] In this process, if there is no leak-proof injection molding head, the molten plastic can easily leak out from the connection between the injection molding head and the injection molding machine, the outlet of the injection molding head, or other possible gaps under pressure. Once leakage occurs, it will not only cause waste of raw materials and increase production costs, but also the leaked molten plastic may adhere to the internal structure of the injection molding machine, affecting the normal operation and service life of the machine. More seriously, if the leaked molten plastic contacts the operator, it may cause safety accidents such as burns. Therefore, a leak-proof injection molding head for an injection molding machine is proposed. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and provides a leak-proof injection molding head for an injection molding machine.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The leak-proof injection molding head for an injection molding machine comprises an injection molding tube and an injection molding head, an annular sealing airbag is installed on the injection molding head, an annular groove is arranged on the inner wall of the injection molding tube, an air cavity and a rotating cavity are arranged inside the injection molding head, the air cavity is communicated with the annular sealing airbag, a piston plate is arranged in the air cavity, a screw is arranged to rotate in the rotating cavity, the piston plate is connected to the screw through a connecting mechanism, a rotating groove is arranged on the injection molding head, the end of the screw extends into the rotating groove, a gear is installed on the screw, the gear cooperates with the injection molding tube through a rotating mechanism, a fixed frame is installed on the injection molding tube, a sliding rod is installed on the fixed frame, a limit rod is arranged on the sliding rod through a sliding sleeve of an extrusion mechanism, and a limit groove is arranged on the injection molding head.

[0007] Preferably, the connection mechanism comprises a connection frame threadedly sleeved on the screw rod, and the end of the connection frame is fixedly connected to the piston plate.

[0008] Preferably, the rotating mechanism comprises a gear ring mounted on the injection molding tube, and the gear ring is meshed with the gear.

[0009] Preferably, the extrusion mechanism comprises a spring sleeved on the outside of the sliding rod, and two ends of the spring are respectively connected to the limiting rod and the fixing frame.

[0010] Preferably, the vertical cross-sectional view of the annular sealing airbag is T-shaped, and the vertical cross-sectional view of the annular groove is also T-shaped.

[0011] Preferably, the piston plate is sealingly and slidably disposed in the air cavity, and the limiting rod is L-shaped.

[0012] Beneficial effects of the utility model:

[0013] 1. During the installation of the injection molding machine head, the piston plate is driven to move by the rotation of the components, so that the gas in the air cavity is filled into the annular sealing airbag, so that it fully fills the annular groove, achieving a good sealing effect and effectively preventing the leakage of the plastic melt during the injection molding process, thereby improving the quality of the injection molded products, reducing material waste, and avoiding production safety hazards that may be caused by leakage.

[0014] 2. When the injection molding machine head needs to be disassembled, pull out the limit rod and rotate the injection molding machine head to make the gas in the annular sealing airbag return to the air cavity, and the airbag becomes deflated, which facilitates the separation of the injection tube and the injection molding machine head. This makes the disassembly and maintenance of the injection molding machine head more convenient, saves time and labor costs, improves production efficiency, and also facilitates the maintenance, replacement or cleaning of the injection molding machine head. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the vertical section structure of the injection molding tube and the injection molding machine head;

[0016] Figure 2 for Figure 1 A schematic diagram of the structure at A;

[0017] Figure 3 for Figure 1 Schematic diagram of the back structure;

[0018] Figure 4 for Figure 3 An enlarged schematic diagram of the structure at location B.

[0019] In the figure: 1 injection tube, 2 injection molding machine head, 3 annular sealing airbag, 4 annular groove, 5 gear ring, 6 air cavity, 7 piston plate, 8 rotating cavity, 9 screw, 10 connecting frame, 11 rotating groove, 12 gear, 13 fixed frame, 14 sliding rod, 15 limiting rod, 16 spring, 17 limiting groove. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-4 The invention discloses a leak-proof injection head for an injection molding machine, comprising an injection molding tube 1 and an injection molding head 2, an annular sealing airbag 3 is installed on the injection molding head 2, an annular groove 4 is arranged on the inner wall of the injection molding tube 1, an air cavity 6 and a rotating cavity 8 are arranged inside the injection molding head 2, the air cavity 6 is connected with the annular sealing airbag 3, the air cavity 6 is filled with gas, the gas can enter the annular sealing airbag 3 to fill it up, and can return to the air cavity 6 to deflate the annular sealing airbag 3.

[0022] A piston plate 7 is provided in the air cavity 6, and the piston plate 7 is sealed and slidably arranged in the air cavity 6. A screw 9 is rotatably provided in the rotating cavity 8, and the piston plate 7 is connected to the screw 9 through a connecting mechanism. A rotating groove 11 is provided on the injection molding machine head 2, and the end of the screw 9 extends into the rotating groove 11. A gear 12 is installed on the screw 9, and the gear 12 cooperates with the injection molding tube 1 through a rotating mechanism. A fixed frame 13 is installed on the injection molding tube 1, and a slide bar 14 is installed on the fixed frame 13. A limit rod 15 is provided on the slide bar 14 through a sliding sleeve of an extrusion mechanism, and the limit rod 15 is L-shaped. A limit groove 17 is provided on the injection molding machine head 2.

[0023] The connecting mechanism includes a connecting frame 10 threadedly sleeved on the screw 9, and the end of the connecting frame 10 is fixedly connected to the piston plate 7. The connecting frame 10 is U-shaped and both branches are sealed and slidable through the inner wall of the rotating chamber 8 and extend into the air chamber 6. Therefore, the connecting frame 10 has its own limit and will not rotate with the screw 9.

[0024] The rotating mechanism includes a gear ring 5 installed on the injection tube 1, which meshes with the gear 12. When the gear 12 rotates relative to the injection tube 1 following the injection molding head 2, it can rotate under the action of the gear ring 5, thereby driving the screw 9 to rotate.

[0025] The extrusion mechanism includes a spring 16 sleeved on the outside of the slide rod 14, and the two ends of the spring 16 are respectively connected to the limit rod 15 and the fixed frame 13. The spring 16 realizes the extrusion of the limit rod 15 to ensure that it enters the limit groove 17, thereby preventing the injection molding head 2 from rotating relative to the injection molding tube 1.

[0026] The vertical cross-section of the annular sealing airbag 3 is T-shaped, and the vertical cross-section of the annular groove 4 is also T-shaped. This shape structure has a limiting effect to prevent the injection tube 1 and the injection molding head 2 from detaching. The unique structure of the T-shaped sealing ring gives it some significant advantages. First, the T-shaped design increases the area of ​​the sealing contact surface. Compared with some simple-shaped sealing rings, a larger contact area means better pressure dispersion, thereby improving the stability and reliability of the seal.

[0027] When the utility model is used, when the injection molding machine head 2 is installed in the injection molding tube 1, the injection molding machine head 2 rotates relative to the injection molding tube 1. During the rotation process, since the gear ring 5 is fixed on the injection molding tube 1 and meshes with the gear 12 on the injection molding machine head 2, the gear 12 will rotate accordingly, thereby driving the screw 9 to rotate. When the screw 9 rotates, the connecting frame 10 provided by the threaded sleeve pushes the piston plate 7 to move in the air cavity 6. When the piston plate 7 moves in the direction close to the annular sealing airbag 3, the gas in the air cavity 6 is squeezed into the annular sealing airbag 3, making it full and filling the annular groove 4, thereby achieving a good sealing effect and preventing leakage.

[0028] Correspondingly, after the limiting rod 15 is pulled out and the limiting rod 15 is separated from the limiting groove 17, the injection molding machine head 2 is then rotated relative to the injection molding tube 1. At this time, when the piston plate 7 moves away from the annular sealing airbag 3, the gas in the annular sealing airbag 3 returns to the air cavity 6, making it deflated so as to facilitate the separation of the injection molding tube 1 from the injection molding machine head 2. This design can also extend the service life of the annular sealing airbag 3. When sealing is not required, the annular sealing airbag 3 is allowed to deflate, which reduces continuous wear and fatigue, thereby maintaining good performance in long-term use.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A leak-proof injection head for an injection molding machine, comprising an injection molding tube (1) and an injection molding head (2), characterized in that: The injection molding machine head (2) is provided with an annular sealing airbag (3), the inner wall of the injection molding tube (1) is provided with an annular groove (4), the injection molding machine head (2) is provided with an air cavity (6) and a rotating cavity (8), the air cavity (6) is communicated with the annular sealing airbag (3), a piston plate (7) is provided in the air cavity (6), a screw (9) is rotatably provided in the rotating cavity (8), the piston plate (7) is connected to the screw (9) through a connection mechanism, and the injection molding machine head (2) is provided with an air cavity (6) and a rotating cavity (8) is provided with a rotating cavity (8). A rotating groove (11) is provided, the end of the screw rod (9) extends into the rotating groove (11), a gear (12) is installed on the screw rod (9), the gear (12) cooperates with the injection tube (1) through a rotating mechanism, a fixed frame (13) is installed on the injection tube (1), a sliding rod (14) is installed on the fixed frame (13), a limiting rod (15) is provided on the sliding rod (14) through an extrusion mechanism sliding sleeve, and a limiting groove (17) is provided on the injection molding machine head (2).

2. The anti-leakage injection molding head for an injection molding machine according to claim 1, characterized in that: The connection mechanism comprises a connection frame (10) threadedly sleeved on a screw rod (9), and an end of the connection frame (10) is fixedly connected to a piston plate (7).

3. The anti-leakage injection molding head for an injection molding machine according to claim 2, characterized in that: The rotating mechanism comprises a gear ring (5) mounted on the injection molding tube (1), and the gear ring (5) is meshed with a gear (12).

4. The anti-leakage injection molding head for an injection molding machine according to claim 3, characterized in that: The extrusion mechanism comprises a spring (16) sleeved on the outside of the slide rod (14), and two ends of the spring (16) are respectively connected to the limit rod (15) and the fixed frame (13).

5. The anti-leakage injection head for an injection molding machine according to claim 4, characterized in that: The vertical cross-sectional view of the annular sealing airbag (3) is T-shaped, and the vertical cross-sectional view of the annular groove (4) is also T-shaped.

6. The anti-leakage injection head for an injection molding machine according to claim 5, characterized in that: The piston plate (7) is sealingly and slidably arranged in the air cavity (6), and the limiting rod (15) is L-shaped.

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