Valve needle type hot runner

Abstract

The utility model provides a valve needle type hot runner, relates to the technical field of injection molds, and solves the technical problem that a structure for protecting a hot nozzle is lacked on a valve needle type hot runner in the prior art. The device comprises a valve body, a hot nozzle sleeve, a hot nozzle and a valve needle, the hot nozzle is connected with the lower end of the needle valve body, the valve needle is located in the needle valve body, the outer wall of the needle valve body is sleeved with the hot nozzle sleeve, the hot nozzle sleeve can wrap the hot nozzle, and the valve needle is located in the valve needle. And the valve needle can penetrate through the opening of the hot nozzle and is matched with the opening of the hot nozzle sleeve.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a valve needle type hot runner. Background Technology

[0002] Compared to ordinary hot runner systems, needle-type hot runner systems have an additional needle actuator to control the opening and closing of the needle, thus controlling the opening and closing of the hot runner nozzle. Needle-valve hot runner systems not only control weld lines and deformation, but also ensure aesthetically pleasing gates and improve product quality. Therefore, needle-valve hot runner systems are widely used in the injection molding of materials with good flowability.

[0003] Currently, with long-term use of needle-type hot runner systems, the frequent opening and closing of the hot nozzle outlet by the valve needle can easily lead to wear on the hot nozzle, which in turn can cause molten plastic leakage. In such cases, the entire needle-type hot runner system needs to be repaired or replaced, which consumes a significant amount of time and reduces work efficiency.

[0004] The applicant has discovered that the prior art has at least the following technical problems:

[0005] In the existing technology, there is a lack of a structure to protect the hot nozzle on the valve needle type hot runner. Utility Model Content

[0006] The purpose of this invention is to provide a valve needle-type hot runner to solve the technical problem of the lack of a structure to protect the hot nozzle in the existing valve needle-type hot runner. 。 The various technical effects of the preferred technical solutions among the many technical solutions provided by this utility model are described in detail below.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This utility model provides a valve needle type hot runner, including a needle valve body, a hot nozzle sleeve, a hot nozzle, and a valve needle. The hot nozzle is connected to the lower end of the needle valve body, the valve needle is located inside the needle valve body, the hot nozzle sleeve is fitted on the outer wall of the needle valve body and can cover the hot nozzle, and the valve needle can pass through the opening of the hot nozzle and cooperate with the opening of the hot nozzle sleeve.

[0009] Optionally, the hot nozzle sleeve includes a cylindrical section and a conical section, the lower end of the cylindrical section is connected to the large opening end of the conical section, the cylindrical section is sleeved on the outer wall of the needle valve body, and the conical section wraps around the hot nozzle.

[0010] Optionally, the tapered segment is provided with a stepped structure.

[0011] Optionally, the opening of the hot nozzle sleeve is a variable diameter hole, and the end of the valve needle is a variable diameter end, with the variable diameter hole cooperating with the variable diameter end.

[0012] Optionally, the variable diameter orifice includes a large orifice section, a tapered orifice section, and the large orifice section, the tapered orifice section, and the small orifice section are connected sequentially from the inside of the hot nozzle sleeve to the outside of the hot nozzle sleeve, wherein the diameter of the large orifice section is larger than the diameter of the small orifice section.

[0013] Optionally, the opening of the hot nozzle is a through hole, and the diameter of the through hole is the same as the diameter of the large hole section.

[0014] Optionally, it also includes a limiting ring, which is sleeved on the needle valve body. The inner wall end of the limiting ring is provided with an annular opening groove, and the upper end of the hot nozzle sleeve is located in the annular opening groove.

[0015] Optionally, an expansion gap is provided between the upper end face of the heating nozzle sleeve and the top wall of the annular opening groove.

[0016] This utility model provides a needle-type hot runner, in which a hot nozzle sleeve is fitted onto the outer wall of the needle valve body and covers the hot nozzle. The opening and closing action of the valve needle is achieved by directly passing through the opening of the hot nozzle and engaging with the opening of the hot nozzle sleeve, thereby opening and closing the needle-type hot runner. Furthermore, the hot nozzle sleeve allows for quick installation and removal, saving time compared to repairing and replacing the hot nozzle. Additionally, the hot nozzle sleeve can be made of a material harder than the hot nozzle, increasing its wear resistance and service life, thus extending the working time of the needle-type hot runner. This solves the technical problem of the lack of a protective structure for the hot nozzle in existing needle-type hot runners. 。 Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the valve needle-type hot runner provided in an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the valve needle-type hot runner provided in an embodiment of the present invention;

[0020] Figure 3 yes Figure 2A partial view of A in the middle;

[0021] Figure 4 yes Figure 2 A partial view of the blocked state of B in the middle;

[0022] Figure 5 yes Figure 2 A partial view of the open state of B in the middle;

[0023] Figure 6 This is a schematic diagram of the structure of the hot nozzle sleeve of the valve needle type hot runner provided in this embodiment of the utility model;

[0024] Figure 7 This is a cross-sectional view of the hot nozzle sleeve of the valve needle type hot runner provided in this embodiment of the utility model;

[0025] Figure 8 This is a schematic diagram of the limiting ring structure of the valve needle-type hot runner provided in this embodiment of the utility model;

[0026] Figure 9 This is a schematic diagram of the structure of a valve needle-type hot runner in the prior art.

[0027] 1. Needle valve body in the figure;

[0028] 2. Heating nozzle sleeve; 21. Cylindrical section; 22. Conical section; 23. Variable diameter hole;

[0029] 3. Hot nozzle; 31. Straight through hole;

[0030] 4. Valve needle; 41. Variable diameter end;

[0031] 5. Restriction ring; 51. Annular opening groove;

[0032] 6. Expansion gap. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship 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 do not indicate or imply that the device or element 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. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] This utility model provides a valve needle type hot runner, including a needle valve body 1, a hot nozzle sleeve 2, a hot nozzle 3 and a valve needle 4, wherein the hot nozzle 3 is connected to the lower end of the needle valve body 1, the valve needle 4 is located inside the needle valve body 1, the hot nozzle sleeve 2 is sleeved on the outer wall of the needle valve body 1 and can wrap the hot nozzle 3, and the valve needle 4 can pass through the opening of the hot nozzle 3 and cooperate with the opening of the hot nozzle sleeve 2. This utility model provides a valve needle type hot runner, in which a hot nozzle sleeve 2 is fitted on the outer wall of the needle valve body 1 and can cover the hot nozzle 3. The opening and closing action of the valve needle 4 is to directly pass through the opening of the hot nozzle 3 and cooperate with the opening of the hot nozzle sleeve 2, thereby realizing the opening and sealing of the valve needle type hot runner. Moreover, the hot nozzle sleeve 2 can be quickly disassembled and assembled, which saves more time compared to the maintenance and replacement of the hot nozzle 3. In addition, the hot nozzle sleeve 2 can be made of a material with a harder hardness than the hot nozzle 3, thereby increasing the wear resistance of the hot nozzle sleeve 2 and thus increasing the service life of the hot nozzle sleeve 2, thereby increasing the working time of the valve needle type hot runner. This solves the technical problem of the lack of a structure to protect the hot nozzle in the valve needle type hot runner in the prior art.

[0037] As an optional implementation, the hot nozzle sleeve 2 includes a cylindrical section 21 and a conical section 22. The lower end of the cylindrical section 21 is connected to the large opening end of the conical section 22. The cylindrical section 21 is fitted onto the outer wall of the needle valve body 1, and the conical section 22 wraps around the hot nozzle 3. The shape of the conical section 22 follows the shape of the hot nozzle 3. The conical section 22 has a stepped structure, and the hot nozzle 3 also has a stepped structure to save space. At room temperature, there is a gap between the cylindrical section 21 and the needle valve body 1, and there is also a gap between the conical section 22 and the hot nozzle 3. When the valve needle hot runner works in the mold, the temperature of the molten plastic is relatively high, which will heat the hot nozzle sleeve 2. The hot nozzle sleeve 2 will be subjected to thermal collision, and the gap is a reserved collision space.

[0038] As an optional implementation, the opening of the hot nozzle sleeve 2 is a variable diameter hole 23, which includes a large hole section, a tapered hole, and a small hole section. The large hole section, tapered hole, and small hole section are connected sequentially from the inside to the outside of the hot nozzle sleeve 2. The diameter of the large hole section is larger than the diameter of the small hole section. The end of the valve needle 4 is a variable diameter end 41, which mates with the variable diameter hole 23. The shape of the variable diameter hole 23 is consistent with that of the variable diameter end 41. When the variable diameter end 41 is inserted into the variable diameter hole 23, there is no gap between the variable diameter hole 23 and the variable diameter end 41, which can prevent molten plastic from passing through. The valve needle 4 mates with the hot nozzle sleeve 2, allowing the use of a material harder than the mold body. Furthermore, the hot nozzle sleeve 2 can be hardened through heat treatment. Generally, mold plates cannot be arbitrarily hardened according to mold design requirements. This structure facilitates processing and extends the life of the parts.

[0039] As an optional implementation, the opening of the hot nozzle 3 is a through hole 31, the diameter of which is the same as the diameter of the large hole section, in order to reduce wear between the hot nozzle 3 and the variable diameter end 41.

[0040] As an optional implementation, a limiting ring 5 is also included. The limiting ring 5 is fitted onto the needle valve body 1, and an annular opening groove 51 is provided on the inner wall end of the limiting ring 5. The upper end of the hot nozzle sleeve 2 is located in the annular opening groove 51. When the valve needle type hot runner is installed in the mold, the limiting ring 5 is bolted to the mold to limit the hot nozzle sleeve 2.

[0041] As an optional implementation, at room temperature, an expansion gap 6 is provided between the upper end face of the hot nozzle sleeve 2 and the top wall of the annular opening groove 51. During injection molding, the hot nozzle sleeve 2 is heated. Since the hot nozzle sleeve 2 is relatively long, its dimensions increase significantly. This expansion gap 6 provides space for the expansion of the hot nozzle sleeve 2, preventing damage to the mold components. The expansion gap can be 0.3-0.5 mm.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A valve needle type hot runner, characterized in that, It includes a needle valve body (1), a heating nozzle sleeve (2), a heating nozzle (3), and a valve needle (4), wherein, The hot nozzle (3) is connected to the lower end of the needle valve body (1), the valve needle (4) is located inside the needle valve body (1), the hot nozzle sleeve (2) is fitted on the outer wall of the needle valve body (1) and the hot nozzle sleeve (2) can cover the hot nozzle (3), and the valve needle (4) can pass through the opening of the hot nozzle (3) and cooperate with the opening of the hot nozzle sleeve (2).

2. The valve needle type hot runner according to claim 1, characterized in that, The hot nozzle sleeve (2) includes a cylindrical section (21) and a conical section (22). The lower end of the cylindrical section (21) is connected to the large opening end of the conical section (22). The cylindrical section (21) is sleeved on the outer wall of the needle valve body (1), and the conical section (22) wraps around the hot nozzle (3).

3. The valve needle type hot runner according to claim 2, characterized in that, The tapered section (22) is provided with a stepped structure.

4. The valve needle type hot runner according to claim 2, characterized in that, The opening of the hot nozzle sleeve (2) is a variable diameter hole (23), and the end of the valve needle (4) is a variable diameter end (41). The variable diameter hole (23) and the variable diameter end (41) are matched.

5. The valve needle type hot runner according to claim 4, characterized in that, The variable diameter hole (23) includes a large hole section, a tapered hole and a small hole section. The large hole section, the tapered hole and the small hole section are connected sequentially from the inside of the hot nozzle sleeve (2) to the outside of the hot nozzle sleeve (2). The diameter of the large hole section is larger than the diameter of the small hole section.

6. The valve needle type hot runner according to claim 5, characterized in that, The opening of the hot nozzle (3) is a through hole (31), and the diameter of the through hole (31) is the same as the diameter of the large hole section.

7. The valve needle type hot runner according to claim 1, characterized in that, It also includes a limiting ring (5), which is fitted on the needle valve body (1). The inner wall end of the limiting ring (5) is provided with an annular opening groove (51), and the upper end of the hot nozzle sleeve (2) is located in the annular opening groove (51).

8. The valve needle type hot runner according to claim 7, characterized in that, An expansion gap (6) is provided between the upper end face of the heating nozzle sleeve (2) and the top wall of the annular opening groove (51).

Images