Injection mold hot runner system applied to polymer pre-filling and sealing injector

Abstract

The invention discloses an injection mold hot runner system applied to a polymer pre-filled injector, and relates to the technical field of injection molding, and the injection mold hot runner system comprises a protection assembly used for supporting the whole injection mold hot runner system and supporting required parts; the air cylinder is located in the middle of one side of the protection assembly; the heating temperature sensing junction box is located at one end of the air cylinder and located on one side of the protection assembly; and the protection assembly comprises a protection cover, a splitter plate is arranged in the protection cover, and a protection shell is arranged at the top of the protection cover. The needle valve hot runner system is adopted, the risk of product sprue wire drawing pollution is avoided, and the product quality is improved; a single product is subjected to two-point needle valve glue feeding, so that the wall thickness and concentricity of the product are better ensured, and hidden dangers caused by non-uniform wall thickness are reduced; the optimized splitter plate and hot nozzle structure reduces the risk of black spots of the product to the maximum extent; the needle valve synchronous driving system is lowest in cost; and the needle valve spacing is smaller, so that 0.5 ml of needle cylinders can be produced to the minimum extent.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to a hot runner system of an injection mold applied to a polymer prefilled syringe. Background Art

[0002] As a higher-level drug packaging material, prefilled syringes are not medical devices, but are composed of drug packaging systems. Prefilled syringes have both the functions of storing drugs and ordinary injections. Prefilled syringes are mainly used for packaging and storage of high-end drugs and are directly used for injection or for ophthalmology, otology, orthopedics and other surgical flushing. With the continuous development of science, biological agents and gene drugs will have breakthrough developments, and prefilled will be the best carrier for these drugs. However, in order to improve the efficiency of preparation during the preparation process of prefilled syringes, it is necessary to use the corresponding injection mold hot runner system to prepare them. The hot runner is a method of heating to ensure that the plastic of the runner and gate remains in a molten state. The hot runner system is generally composed of several parts such as a hot nozzle, a manifold, a temperature control box and accessories. There are generally two types of hot nozzles, open hot nozzles and needle valve hot nozzles. Since the form of the hot nozzle directly determines the selection of the hot runner system and the manufacture of the mold, the hot runner system is often divided into an open hot runner system and a needle valve hot runner system.

[0003] However, the existing injection molds used in polymer prefilled syringes are prone to wire drawing risks during use, which reduces the quality of the product, increases the hidden dangers caused by uneven wall thickness, increases the risk of black spots in the product, and has certain limitations on the product spacing, thereby reducing the utilization rate. Summary of the invention

[0004] The purpose of the present invention is to provide a hot runner system for injection molds used in polymer prefilled syringes in order to solve the problems that the existing injection molds used in polymer prefilled syringes are prone to the risk of wire drawing during use, thereby reducing the quality of the product, increasing the hidden dangers caused by uneven wall thickness, increasing the risk of black spots in the product, and having certain limitations on the product spacing, thereby reducing the utilization rate.

[0005] To achieve the above object, the present invention provides the following technical solution: a hot runner system for an injection mold used in a polymer prefilled syringe, comprising:

[0006] Protective components are used to support the entire injection mold hot runner system and the required components;

[0007] A cylinder, located in the middle of one side of the guard assembly;

[0008] A heating temperature sensing junction box is located at one end of the cylinder and on one side of the protective assembly;

[0009] The protection assembly includes a protection cover, a diverter plate is arranged inside the protection cover, a protection shell is arranged on the top of the protection cover, a valve needle push plate is arranged on the top of the diverter plate, and the valve needle push plate is located inside the protection shell, a cover plate is arranged on the top of the protection shell, the valve needle push plate is in a "U" shape, a main nozzle extending to the bottom is arranged at the middle position of the top of the valve needle push plate, valve needles are arranged at the four corners outside the main nozzle and inside the valve needle push plate, hot nozzles are arranged at the four corners of the bottom of the diverter plate, and a syringe is arranged at the middle position of the bottom of the diverter plate.

[0010] As a further solution of the present invention: the output end of the cylinder extends to one side of the interior of the protective shell and is butt-connected with the middle position of one side of the valve needle push plate.

[0011] As a further solution of the present invention: the diverter plate is used for external heating, and the hot nozzle is used for direct heating.

[0012] As a further solution of the present invention: a plug hole is provided at the middle position of the top of the cover plate, and the main nozzle is movably connected to the cover plate through the plug hole.

[0013] As a further solution of the present invention: a plurality of valve needle movable holes are evenly arranged at the four corners of the top of the cover plate, and the four groups of valve needles are movably connected to the cover plate through the valve needle movable holes.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By setting up protective components, cylinders and heating temperature-sensing junction boxes, a needle valve hot runner system is used during use to avoid the risk of product gate wiredrawing contamination and improve product quality; a single product is injected with two-point needle valves to better ensure the wall thickness and concentricity of the product and reduce the hidden dangers caused by uneven wall thickness; the optimized manifold and hot nozzle structure (3D printing to avoid dead angles) minimizes the risk of product black spots; the lowest cost needle valve synchronous drive system; and a smaller needle valve spacing (12mm) allow us to produce a minimum of 0.5ml syringes, thereby increasing the utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of the present invention;

[0017] Figure 2 It is a partial stereogram of the present invention;

[0018] Figure 3 It is a rear view of the present invention;

[0019] Figure 4 It is a front view of the present invention;

[0020] Figure 5 It is a left side view of the present invention;

[0021] Figure 6 A top view of the present invention;

[0022] Figure 7 A top view of the present invention;

[0023] Figure 8 is an internal stereogram of the present invention;

[0024] Fig. 9 It is a schematic diagram of the internal structure of the present invention.

[0025] In the figure: 1. Protection assembly; 101. Protection cover; 102. Protection shell; 103. Cover plate; 104. Main nozzle; 105. Valve needle; 106. Hot nozzle; 107. Syringe; 108. Diverter plate; 109. Valve needle push plate; 2. Cylinder; 3. Heating temperature sensing junction box. DETAILED DESCRIPTION

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

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0028] See also Figures 1 to 9In an embodiment of the present invention, a hot runner system for an injection mold used in a polymer prefilled syringe comprises:

[0029] Protection component 1, used to support the entire injection mold hot runner system and required parts;

[0030] The cylinder 2 is located at the middle position of one side of the protection component 1;

[0031] A heating temperature sensing junction box 3 is located at one end of the cylinder 2 and at one side of the protection component 1;

[0032] The protection component 1 includes a protection cover 101, a diverter plate 108 is arranged inside the protection cover 101, a protection shell 102 is arranged on the top of the protection cover 101, a valve needle push plate 109 is arranged on the top of the diverter plate 108, and the valve needle push plate 109 is located inside the protection shell 102, a cover plate 103 is arranged on the top of the protection shell 102, the valve needle push plate 109 is in a "U" shape, a main nozzle 104 extending to the bottom of the valve needle push plate 109 is arranged at the middle position of the top of the valve needle push plate 109, valve needles 105 are arranged at the four corners outside the main nozzle 104 and inside the valve needle push plate 109, hot nozzles 106 are arranged at the four corners of the bottom of the diverter plate 108, and a syringe 107 is arranged at the middle position of the bottom of the diverter plate 108.

[0033] Please refer to Figure 1 , 2 , 3, 4, 5, 6, 7, 8 and 9, the output end of the cylinder 2 extends to one side of the inside of the protective shell 102 and is docked with the middle position of one side of the valve needle push plate 109, so that when the output end of the cylinder 2 is extended or shortened under the action of electricity, it will directly act on the valve needle push plate 109.

[0034] Please refer to Figure 8 , the manifold 108 is used for external heating, and the hot nozzle 106 is used for direct heating.

[0035] Please refer to Figure 1 , 2 , 3, 4, 5, 6 and 7, a plug hole is provided at the middle position of the top of the cover plate 103, and the main nozzle 104 is movably connected to the cover plate 103 through the plug hole to facilitate glue injection.

[0036] Please refer to Figure 1 , 2 , 3, 4, 5, 6 and 7, a plurality of valve needle movable holes are evenly arranged at the four corners of the top of the cover plate 103, and the four valve needles 105 are movably connected to the cover plate 103 through the valve needle movable holes.

[0037] The working principle of the present invention is: when in use, a needle valve hot runner system is adopted to avoid the risk of wire drawing contamination at the product gate and improve product quality; a single product is fed with two-point needle valves to better ensure the wall thickness and concentricity of the product and reduce the hidden dangers caused by uneven wall thickness; the optimized diverter plate 108 and hot nozzle 106 structure (3D printing to avoid dead angles) minimize the risk of product black spots; the lowest cost needle valve synchronous drive system; smaller needle valve spacing (12mm) allows us to produce a minimum of 0.5ml syringe 107, thereby improving the utilization rate.

[0038] What has been described above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hot runner system for injection molds used in polymer prefilled syringes, characterized in that: include: A protective assembly (1) is used to support the entire injection mold hot runner system and to support required components; The cylinder (2) is located at a middle position on one side of the protection component (1); A heating temperature sensing junction box (3) is located at one end of the cylinder (2) and at one side of the protection component (1); The protection component (1) comprises a protection cover (101), a diverter plate (108) is arranged inside the protection cover (101), a protection shell (102) is arranged on the top of the protection cover (101), a valve needle push plate (109) is arranged on the top of the diverter plate (108), and the valve needle push plate (109) is located inside the protection shell (102), a cover plate (103) is arranged on the top of the protection shell (102), a main nozzle (104) extending to the bottom is arranged at the middle position of the top of the valve needle push plate (109), valve needles (105) are arranged at the four corners of the outer side of the main nozzle (104) and located inside the valve needle push plate (109), and hot nozzles (106) are arranged at the four corners of the bottom of the diverter plate (108).

2. The hot runner system for injection molds used in polymer prefilled syringes according to claim 1, characterized in that: A syringe (107) is provided at the middle position of the bottom of the diverter plate (108).

3. The hot runner system for injection molds used in polymer prefilled syringes according to claim 2, characterized in that: The output end of the cylinder (2) extends to one side of the interior of the protective shell (102) and is butt-connected to the middle position of one side of the valve needle push plate (109).

4. The hot runner system for injection molds used in polymer prefilled syringes according to claim 3, characterized in that: The diverter plate (108) is used for external heating, and the hot nozzle (106) is used for direct heating.

5. The hot runner system for injection molds used in polymer prefilled syringes according to claim 4, characterized in that: A plug hole is provided at the middle position of the top of the cover plate (103).

6. The hot runner system for injection molds used in polymer prefilled syringes according to claim 5, characterized in that: The main nozzle (104) is movably connected to the cover plate (103) via a socket.

7. The hot runner system for injection molds used in polymer prefilled syringes according to claim 6, characterized in that: A plurality of valve needle movable holes are evenly arranged at the four corners of the top of the cover plate (103).

8. The hot runner system for injection molds used in polymer prefilled syringes according to claim 7, characterized in that: The four groups of valve needles (105) are all movably connected to the cover plate (103) through the valve needle movable holes.

9. The hot runner system for injection molds used in polymer prefilled syringes according to claim 8, characterized in that: The valve needle push plate (109) is in a "U"-shaped structure.

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