Assembled injection molding hot nozzle

Abstract

The utility model relates to the technical field of injection molding, in particular to a split mounting type injection molding hot nozzle, which comprises a positioning ring, a middle ring and a hot nozzle main body, the positioning ring is detachably connected with the hot nozzle main body, the middle ring is connected with the positioning ring and sleeved on the hot nozzle main body, and the middle ring is provided with a mounting groove for mounting a heating component. An injection molding cavity is formed in the hot nozzle main body in a penetrating manner; and a glue inlet communicated with the injection molding cavity is formed in the positioning ring. Through the detachable positioning ring, the middle ring and the hot nozzle main body, the injection molding hot nozzle with an assembled structure is provided, so that the damaged hot nozzle can be quickly replaced, the cost of a hot runner injection mold is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, and more specifically, to an assembled injection hot nozzle. Background Art

[0002] The injection molding process is the most critical step in the production of PVC pipe fittings. The quality and efficiency of the injection molding process determine the production cost of PVC pipe fittings. Injection molding processes are generally divided into hot runner and cold runner injection molding, depending on the runner system. The injection nozzle is a component used in hot runner injection molding, located at the discharge point of the injection molding machine. Choosing the appropriate injection nozzle based on the characteristics of the injection molded product is crucial for achieving a stable surface finish.

[0003] In the prior art, Chinese patent CN206568475U discloses an injection hot nozzle, comprising a nozzle body, an injection hole is provided along the central axis of the nozzle body, and a clamping position fixed to the discharge port of the injection molding machine is provided on the outer circumferential surface of the nozzle body. A glue inlet end and a glue outlet end are provided at both ends of the nozzle body along the axial direction, and the injection hole is provided through the glue inlet end and the glue outlet end. The end face of the glue inlet end is inclined 0.4 to 0.7 degrees toward the injection hole to form an inclined surface. Under the action of pressure, the pressure and flow direction of the molten plastic are concentrated at the injection hole position, thereby improving the injection molding quality. However, the injection hot nozzle in the prior art is an integral structure. When the hot nozzle structure is damaged and cannot meet the production standard, the injection hot nozzle and the diverter plate connected thereto need to be replaced as a whole, which takes a long time to maintain and has high mold costs. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art in that after a hot nozzle is damaged, the maintenance time is long and the mold cost is high, and to provide an assembled injection hot nozzle, which realizes the rapid replacement of a damaged hot nozzle, reduces the cost of the hot runner injection mold, and improves production efficiency.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] Provided is an assembled injection hot nozzle, comprising a positioning ring, an intermediate ring and a hot nozzle body, wherein the positioning ring is detachably connected to the hot nozzle body, the intermediate ring is connected to the positioning ring and is sleeved on the hot nozzle body, the intermediate ring is provided with a mounting groove for mounting a heating component, an injection cavity is provided through the interior of the hot nozzle body, and the positioning ring is provided with a glue inlet connected to the injection cavity.

[0007] The utility model relates to an assembled injection hot nozzle. First, the intermediate ring is connected to the positioning ring. Then, the positioning ring is installed on the nozzle body. The intermediate ring is sleeved on the nozzle body. The glue inlet on the positioning ring is connected to the injection cavity inside the nozzle body. After the assembled injection hot nozzle is assembled, the nozzle is fixed to the mold for PVC hot runner injection molding. The heating component on the mold is connected to the mounting groove on the intermediate ring to ensure a stable connection and surround the nozzle body. During the injection molding process, the glue enters from the glue inlet, remains in a molten state under the action of the heating component, and passes through the injection cavity connected to it into the mold. During repeated injection molding, the nozzle body is the part most likely to break. When the nozzle body breaks, it only needs to be disassembled from the positioning ring and the intermediate ring, and then a nozzle body of appropriate size and specifications can be reinstalled. There is no need to replace the nozzle as a whole, which reduces the production cost of the hot runner injection mold. The hot nozzle replacement operation is simple and quick, and the hot runner injection molding production efficiency is improved.

[0008] Furthermore, the positioning ring and the nozzle body are connected by a thread. The positioning ring is provided with an external thread, and the nozzle body is provided with an internal thread. The threaded connection between the positioning ring and the nozzle body can ensure a stable connection and make disassembly and installation simple and convenient, thereby improving the installation efficiency between the nozzle body and the positioning ring.

[0009] Furthermore, the positioning ring and the intermediate ring are connected by screws. Threaded holes of the same size are provided at corresponding positions of the positioning ring and the intermediate ring. The positioning ring and the intermediate ring are connected by screws to ensure that their relative positions remain fixed during the injection molding process without deflection or loosening.

[0010] Furthermore, the injection cavity includes a glue inlet connected to the positioning ring, an intermediate flow channel, and a glue outlet, wherein the glue inlet and the glue outlet are connected via the intermediate flow channel. PVC rubber flows from the positioning ring into the nozzle, flows steadily in the injection cavity, passes through the glue inlet, the intermediate flow channel, and the glue outlet, and then flows out of the nozzle body, ultimately entering the injection mold.

[0011] Furthermore, the axes of the inlet, middle flow channel, and outlet coincide with each other. Aligning the inlet, middle flow channel, and outlet ensures that their central axes coincide, allowing the flow of the rubber material in the injection cavity to be smoother and maintaining a stable amount of rubber inflow, thus avoiding surface defects such as surface scratches on the product during the injection molding process.

[0012] Furthermore, the diameter of the glue inlet end is larger than the diameter of the intermediate flow channel, and the diameter of the glue inlet end is equal to the diameter of the glue outlet end. During the injection molding process, the glue inlet end where the nozzle body connects to the positioning ring and the glue outlet end where the nozzle body connects to the mold are prone to glue blockage. Setting a larger diameter increases the volume of the glue inlet and glue outlet ends, avoiding glue blockage at the points where the glue enters and exits the nozzle body. The glue flow process in the intermediate flow channel tends to be stable. The inner diameter of the intermediate flow channel can be selected according to the molded product and the characteristics of the plastic. The nozzle body with appropriate size specifications can be selected according to different molding requirements.

[0013] Furthermore, the nozzle body is provided with a heating tube, which is connected to the mounting groove and sleeved on the nozzle body. The heating tube is sleeved on the nozzle body to keep the PVC plastic in the nozzle body in a molten state at all times and can flow smoothly in the nozzle body.

[0014] Furthermore, the nozzle body is provided with a spiral heating groove, and a heating wire is provided in the spiral heating groove. The spiral heating wire provides a stable heating effect for the rubber material flowing in the nozzle body, ensuring a constant temperature of the nozzle body and avoiding local overheating.

[0015] Furthermore, an annular positioning groove is provided at one end of the nozzle body away from the positioning ring. The annular positioning groove at the end of the nozzle body facilitates installation of the nozzle body into the corresponding hot runner injection mold, providing a positioning effect for the installation of the assembled nozzle.

[0016] Furthermore, the positioning ring is provided with mutually parallel operating parts, which facilitate clamping with tools such as a wrench, thereby quickly rotating the positioning ring to complete the connection between the positioning ring and the nozzle body.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. It realizes the rapid replacement of damaged hot nozzles, reduces the cost of hot runner injection molds, and improves the production efficiency of injection molding;

[0019] 2. The size of the nozzle structure can be quickly changed according to the product size requirements, thereby stabilizing the product appearance and avoiding defects such as surface scratches on the injection molded product;

[0020] 3. The hot nozzle has a simple structure and is easy to assemble. It is suitable for a variety of hot runner injection molds, shortening the development cycle of the hot runner injection molding system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an assembled injection hot nozzle;

[0022] Figure 2 It is a structural diagram of the hot nozzle body;

[0023] Figure 3 It is a structural diagram of the positioning ring;

[0024] Figure 4 Schematic diagram of the structure of the middle ring;

[0025] In the accompanying drawings: 100, positioning ring; 101, glue inlet; 102, operating part; 200, intermediate ring; 201, mounting groove; 300, hot nozzle body; 301, injection cavity; 302, glue inlet end; 303, intermediate flow channel; 304, glue outlet end; 305, annular positioning groove. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] Example 1

[0029] This embodiment is the first embodiment of the assembled injection hot nozzle. The assembled injection hot nozzle in this example includes a positioning ring 100, an intermediate ring 200 and a hot nozzle body 300. The positioning ring 100 is detachably connected to the hot nozzle body 300, the intermediate ring 200 is connected to the positioning ring 100 and is sleeved on the hot nozzle body 300, and the intermediate ring 200 is provided with a mounting groove 201 for installing the heating component. The hot nozzle body 300 is provided with an injection cavity 301 running through it, and the positioning ring 100 is provided with a glue inlet 101 connected to the injection cavity 301.

[0030] like Figure 1As shown, in the process of using the assembled hot nozzle in this embodiment, the positioning ring 100 and the intermediate ring 200 are first fixedly connected, and then the positioning ring 100 is connected to the hot nozzle body 300. During the connection process, it is necessary to ensure that the glue inlet 101 on the positioning ring 100 is aligned with the injection cavity 301 inside the hot nozzle body 300, and the central axes of the two coincide and remain connected. Figure 4 As shown, the intermediate ring 200 is provided with a mounting groove 201. After assembly, the intermediate ring 200 is mounted on the nozzle body 300, with the mounting groove 201 located on the side of the intermediate ring 200 closest to the nozzle body 300, thus completing the assembly of the modular nozzle. During PVC hot runner injection molding, the modular nozzle is connected to the hot runner injection mold. The rubber flows into the nozzle body from the rubber inlet 101 within the positioning ring 100. The heating assembly is connected to the mounting groove 201 on the intermediate ring 200, continuously heating the nozzle body to ensure that the rubber inside remains molten. The rubber passes through the injection cavity 301 provided through the nozzle body and finally flows out from the other end of the nozzle body that is not connected to the positioning ring 100, entering the mold to complete the product molding. During the PVC hot runner injection molding process, the injection cavity 301 in the hot nozzle body 300 has a large contact area with the rubber material and maintains a high temperature for a long time, making it the part most prone to damage. When the hot nozzle body is structurally damaged and cannot meet production standards, due to the detachable connection structure between the hot nozzle body and the positioning ring 100, it only needs to be removed from the positioning ring 100 and the intermediate ring 200 and replaced with a new hot nozzle body 300. There is no need to replace the entire hot nozzle structure. This enables rapid replacement of damaged hot nozzles, reduces the cost of hot runner injection molds, and improves injection molding production efficiency.

[0031] The positioning ring 100 and the nozzle body 300 in this embodiment are connected by threads. Figure 1 As shown, an external thread is provided on the positioning ring 100, and an internal thread is provided on the hot nozzle body, or an internal thread is provided on the positioning ring 100, and an external thread is provided on the hot nozzle body. The positioning ring 100 and the hot nozzle body are fixed by threaded connection. The structure is simple, easy to form, and the installation and disassembly process is convenient and fast, which improves the installation efficiency between the hot nozzle body 300 and the positioning ring 100. At the same time, the connection is stable and the sealing is good, which can prevent the internal molten rubber from leaking.

[0032] The locating ring 100 and the intermediate ring 200 are connected by screws. Screw holes are provided on the locating ring 100 and the intermediate ring 200. To ensure a stable connection, the number of screw holes should be controlled to be at least two. The screw holes are evenly distributed in a circular shape on the locating ring 100 and the intermediate ring 200. Connecting the locating ring 100 and the intermediate ring 200 with screws ensures that their relative position remains fixed during the injection molding process, preventing deflection and loosening, thereby improving the surface quality of the injection-molded product.

[0033] like Figure 2As shown, an annular positioning groove 305 is provided at one end of the nozzle body 300 away from the positioning ring 100. One end of the nozzle body 300 is connected to the positioning ring 100, and the other end is provided with an annular positioning groove 305. The transition between the annular positioning groove 305 and the outer surface of the nozzle body can be rounded to facilitate installation of the nozzle body 300 into the corresponding hot runner injection mold, providing a positioning effect for the installation of assembled nozzles.

[0034] The positioning ring 100 is provided with parallel operating portions 102. In this embodiment, the positioning ring 100 has an arc-like outer surface and is provided with at least two sets of operating portions 102 on its side for easy clamping. The operating portions 102 are parallel to each other, allowing operators to easily clamp the positioning ring 100 with a wrench, thereby enabling stable rotation and completing the connection or disconnection between the positioning ring 100 and the nozzle body 300.

[0035] The working principle of the assembled injection hot nozzle in this embodiment is as follows: after connecting the intermediate ring 200 and the positioning ring 100 by screws, align the nozzle body 300 and the positioning ring 100, then use a wrench or other tool to clamp the operating part 102 on the positioning ring 100 and rotate it to complete the threaded connection between the nozzle body 300 and the positioning ring 100, and finally install the assembled assembled injection hot nozzle on the PVC hot runner injection mold for injection molding.

[0036] Example 2

[0037] This embodiment is the second embodiment of the assembled injection nozzle. This embodiment is similar to the first embodiment, except that the injection cavity 301 includes a glue inlet end 302 connected to the positioning ring 100, an intermediate flow channel 303, and a glue outlet end 304. The glue inlet end 302 and the glue outlet end 304 are connected via the intermediate flow channel 303. Figure 2 As shown, during the injection molding process, the PVC rubber flows from the positioning ring 100 into the hot nozzle, and the rubber flows steadily in the injection cavity 301, always maintaining a molten state, and then flows out of the hot nozzle body 300 after passing through the rubber inlet end 302, the middle flow channel 303, and the rubber outlet end 304 in sequence, and finally enters the injection mold.

[0038] In this embodiment, the axes of the glue inlet 302, the intermediate flow channel 303, and the glue outlet 304 coincide with each other. Keeping the central axes of the glue inlet 302, the intermediate flow channel 303, and the glue outlet 304 coincident ensures smooth flow of the molten glue in the injection cavity 301, maintains a stable glue inflow rate, and avoids appearance defects such as surface scratches on the product during the injection molding process.

[0039] like Figure 2As shown, the diameter of the glue inlet end 302 is larger than the diameter of the intermediate flow channel 303, and the diameter of the glue inlet end 302 is equal to the diameter of the glue outlet end 304. During the injection molding process, the glue inlet end 302, where the nozzle body 300 connects to the positioning ring 100, and the glue outlet end 304, where the nozzle connects to the mold, are prone to glue blockage. Setting a larger diameter increases the volume of the glue inlet end 302 and the glue outlet end 304, preventing glue blockage at the points where glue enters and exits the nozzle body 300. The glue flow process in the intermediate flow channel 303 is stable. The inner diameter of the intermediate flow channel 303 can be selected based on the molded product and the characteristics of the plastic. The size of the nozzle structure can be quickly adjusted according to the product size requirements, improving the molding quality of the injection molded product.

[0040] The working principle of the assembled injection molding hot nozzle in this embodiment is as follows: the PVC rubber flows in from the rubber inlet end 302 with a larger diameter, avoiding blockage caused by a large amount of rubber inlet, flows smoothly in the middle flow channel 303 of a suitable diameter, and finally flows out from the rubber outlet end 304 with a larger diameter, avoiding blockage caused by a slow rubber outlet speed.

[0041] Example 3

[0042] This embodiment is the third embodiment of an assembled injection molding nozzle. This embodiment is similar to the first embodiment, except that a heating tube is provided on the nozzle body 300. The heating tube is connected to the mounting groove 201 and is mounted on the nozzle body 300. The heating tube is mounted on the nozzle body and continuously heats the nozzle body 300, keeping the PVC material in the injection cavity 301 molten and flowing smoothly.

[0043] The working principle of the assembled injection hot nozzle in this embodiment is as follows: the heating tube is fixed by the installation groove 201, and the heating tube is sleeved on the hot nozzle body, so that the hot nozzle body always maintains a high temperature to facilitate the smooth flow of the rubber material.

[0044] Example 4

[0045] This fourth embodiment of an assembled injection molding nozzle is similar to the first embodiment, except that a spiral heating groove is provided on the nozzle body 300, within which a heating wire is installed. The volume of the rubber material within the injection cavity 301 at the inlet end 302, the middle flow channel 303, and the outlet end 304 varies. The density of the spiral heating wire can be adjusted based on the position, allowing for a dense structure at both ends and a sparse structure in the middle. This provides a stable heating effect for the rubber material flowing within the nozzle body 300, ensuring a constant temperature and preventing localized overheating.

[0046] The working principle of the assembled injection molding hot nozzle in this embodiment is as follows: by providing a spiral heating groove and a heating wire on the hot nozzle body, a stable heating effect is provided for the hot nozzle body to avoid local overheating.

[0047] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An assembled injection hot nozzle, characterized in that: The invention comprises a positioning ring (100), an intermediate ring (200) and a hot nozzle body (300), wherein the positioning ring (100) is detachably connected to the hot nozzle body (300), the intermediate ring (200) is connected to the positioning ring (100) and is sleeved on the hot nozzle body (300), the intermediate ring (200) is provided with a mounting groove (201) for mounting a heating component, an injection cavity (301) is provided through the inside of the hot nozzle body (300), and the positioning ring (100) is provided with a glue inlet (101) connected to the injection cavity (301).

2. The assembled injection hot nozzle according to claim 1, characterized in that: The positioning ring (100) and the nozzle body (300) are connected by threads.

3. The assembled injection hot nozzle according to claim 1, characterized in that: The positioning ring (100) and the intermediate ring (200) are connected by screws.

4. The assembled injection hot nozzle according to claim 1, characterized in that: The injection cavity (301) comprises a glue inlet end (302) connected to the positioning ring (100), an intermediate flow channel (303), and a glue outlet end (304), wherein the glue inlet end (302) and the glue outlet end (304) are connected via the intermediate flow channel (303).

5. The assembled injection hot nozzle according to claim 4, characterized in that: The axes of the glue inlet end (302), the middle flow channel (303) and the glue outlet end (304) coincide with each other.

6. The assembled injection hot nozzle according to claim 5, characterized in that: The diameter of the glue inlet end (302) is larger than the diameter of the middle flow channel (303), and the diameter of the glue inlet end (302) is equal to the diameter of the glue outlet end (304).

7. The assembled injection hot nozzle according to claim 1, characterized in that: The hot nozzle body (300) is provided with a heating tube, which is connected to the mounting groove (201) and sleeved on the hot nozzle body (300).

8. The assembled injection hot nozzle according to claim 1, characterized in that: The nozzle body (300) is provided with a spiral heating groove, and a heating wire is provided in the spiral heating groove.

9. The assembled injection hot nozzle according to any one of claims 1 to 8, characterized in that: An annular positioning groove (305) is provided at one end of the hot nozzle body (300) away from the positioning ring (100).

10. The assembled injection hot nozzle according to any one of claims 1 to 8, characterized in that: The positioning ring (100) is provided with operating parts (102) parallel to each other.

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