Hot nozzle system

Abstract

The present invention discloses a hot nozzle system for injection molding a cylindrical rod product, comprising a nozzle core connected to a flow channel, and at least two glue inlets connected in parallel to the flow channel are formed on the nozzle core, and the glue inlets are symmetrically arranged with the axis of the cylindrical rod product as the center. The hot nozzle system of the present invention converts the production of cylindrical rod products from cold runner to hot runner production, reduces the waste of production raw materials, simultaneously reduces the injection molding cycle, improves the injection molding efficiency, and greatly improves the production efficiency of marker pen rods.

Description

Technical Field

[0001] The invention belongs to the field of injection molding, and in particular relates to a hot nozzle system. Background Art

[0002] Existing barrel products are bilaterally symmetrical slender columns, such as marker pen barrels. Due to the small size of the barrel, injection molding is difficult.

[0003] like Figure 1 As shown in the figure, if the traditional cold runner injection method is used, two injection ports need to be set at the cold runner gate. The coaxiality requirements of the product can be effectively guaranteed by cold two-point injection, while the single-point injection is prone to cause eccentric injection of the product. However, in order to improve product production efficiency, multi-cavity molds are often used for such products. Due to excessive gate material, a great waste of injection raw materials is caused.

[0004] like Figure 2 As shown in the figure, the new hot runner injection method, that is, the hot nozzle, can completely solve the problem of waste of injection raw materials. However, the distance between the two injection ports of the marker pen holder is only 6.6mm, while the minimum outer diameter of the traditional nozzle core is 27mm, so it is impossible to achieve double-point injection. If the injection is done at a single point, it will cause the problem of eccentric injection of the product. Summary of the invention

[0005] The present invention provides a hot nozzle system to solve the technical problem that hot runner is difficult to double-point glue injection mentioned in the background technology.

[0006] To achieve the above purpose, the specific technical solution of the hot nozzle system of the present invention is as follows:

[0007] A hot nozzle system is used for injection molding a cylindrical rod product, comprising a nozzle core connected to a flow channel, the nozzle core is formed with at least two glue inlets connected in parallel to the flow channel, and the glue inlets are symmetrically arranged with the axis of the cylindrical rod product as the center.

[0008] Furthermore, the hot nozzle system also includes a hot nozzle body, a nozzle core is arranged on the hot nozzle body, and the nozzle core and the hot nozzle body are fixed in the circumferential direction.

[0009] Furthermore, a pressing plate is fixedly connected to the hot nozzle body, and the pressing plate presses the nozzle core onto the hot nozzle body; a through hole is opened on the pressing plate, and the nozzle core passes through the through hole to expose the glue inlet.

[0010] Furthermore, a mounting groove for accommodating the pressure plate is formed on the hot nozzle body.

[0011] Furthermore, a sealing ring is clamped between the pressing plate and the nozzle body.

[0012] Furthermore, the nozzle body is provided with a concave platform, and two sides of the sealing ring are clamped between the side walls of the concave platform and the nozzle core.

[0013] Furthermore, two ends of the sealing ring are clamped between the bottom surface of the concave platform and the pressing plate.

[0014] Furthermore, a boss is formed on the side of the nozzle core, and the sealing ring is sleeved outside the nozzle core with one end abutting against the boss.

[0015] Furthermore, the sealing ring is formed with a sheath, which is arranged outside the nozzle core and extends from between the through opening of the pressing plate and the nozzle core.

[0016] Furthermore, a valve needle is provided in the glue inlet, and the valve needle penetrates the hot nozzle body and extends into the corresponding glue inlet.

[0017] The hot nozzle system of the present invention has the following advantages: the barrel product is converted from cold runner production to hot runner production, which reduces the waste of production raw materials, simultaneously reduces the injection molding cycle, improves the injection molding efficiency, and greatly improves the production efficiency of marker pen barrels. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of traditional cold runner injection molding;

[0019] Figure 2 This is a schematic diagram of traditional hot runner injection molding;

[0020] Figure 3 A cross-sectional view of a hot nozzle system of the present invention;

[0021] Figure 4 for Figure 3 A magnified view of part A;

[0022] Figure 5 It is a schematic diagram of the structure of the hot nozzle system of the present invention;

[0023] Figure 6 An exploded view of the hot nozzle body and nozzle core of the present invention;

[0024] Figure 7 It is a schematic diagram of the nozzle core structure of the present invention.

[0025] Description of the markings in the figure:

[0026] 1. Nozzle body; 11. Flow channel; 12. Mounting groove; 13. Positioning hole; 14. Threaded hole; 15. Concave platform; 2. Nozzle core; 21. Glue inlet; 22. Positioning part; 23. Boss; 3. Press plate; 31. Countersunk hole; 4. Sealing ring; 41. Sleeve; 6. Valve needle; 7. Guide sleeve; 8. Cylinder stem product. DETAILED DESCRIPTION

[0027] In order to better understand the purpose, structure and function of the present invention, a hot nozzle system of the present invention is further described in detail below with reference to the accompanying drawings.

[0028] like Figure 3 and Figure 4 As shown, the hot nozzle system of the present invention is used for injection molding a cylindrical rod product 8. Specifically, the hot nozzle system includes a hot nozzle body 1. A flow channel 11 is provided in the hot nozzle body 1, and the flow channel 11 allows molten plastic particles to flow. The flow channel 11 is connected to a nozzle core 2, and the plastic particles are discharged from the hot nozzle body 1 through the nozzle core 2.

[0029] In order to realize the double-point glue injection of the barrel rod product 8, at least two glue inlets 21 are formed on each nozzle core 2, and the glue inlets 21 are connected in parallel to the flow channel 11. Due to limited space and strength, generally two glue inlets 21 are provided. The glue inlets 21 are symmetrically arranged with the axis of the barrel rod product 8 as the center. It should be noted that since the barrel rod product 8 is not formed in the cavity before injection molding, and the barrel rod product 8 is determined by the cavity, the axis of the barrel rod product 8 is the axis of the cavity. Thereby changing the traditional setting method of one glue inlet 21 on the nozzle core 2, directly setting two symmetrical glue inlets 21 on the nozzle core 2 for joint injection molding, and ensuring the coaxiality of the barrel rod product 8.

[0030] Combination Figures 5 to 7 As shown, in order to install and fix the nozzle core 2, the nozzle body 1 is formed with a positioning hole 13, and a positioning portion 22 is formed at one end of the nozzle core 2. The positioning portion 22 is inserted into the positioning hole 13, so that the nozzle core 2 is initially fixed on the nozzle body 1. Moreover, the positioning hole 13 is connected with the flow channel 11. When the positioning portion 22 is inserted into the positioning hole 13 for fixing, the flow channel 11 on the nozzle body 1 and the glue inlet 21 of the nozzle core 2 are connected in parallel.

[0031] Since the positioning portion 22 is in an oblong shape and the positioning hole 13 is a straight hole matched with the positioning portion 22, the nozzle core 2 is fixed on the nozzle body 1 and the nozzle core 2 and the nozzle body 1 are fixed in the circumferential direction.

[0032] Different from the conventional hot nozzle with a single glue inlet 21 that does not need to be fixed circumferentially and can rotate, since there are two glue inlets 21 on the nozzle core 2, if the nozzle core 2 rotates under pressure, the positions of the two glue inlet points cannot be guaranteed, and thus the reasonable distribution of the mold cavity cannot be guaranteed, which causes troubles in realizing the mass production of multi-cavity pen molds. Therefore, the positioning hole 13 and the positioning part 22 cooperate with each other to achieve circumferential fixation.

[0033] Of course, the positioning hole 13 and the positioning portion 22 may be polygonal, or other structures may be used to achieve circumferential fixation of the nozzle core 2 and the nozzle body 1, such as providing a latch pin to fix the nozzle core 2, providing a buckle to fix the nozzle core 2, providing a top screw to fix the nozzle core 2, etc.

[0034] In order to fix the nozzle core 2, a pressure plate 3 is bolted to the nozzle body 1, and the pressure plate 3 presses the nozzle core 2 onto the nozzle body 1. A through hole is opened on the pressure plate 3, and the nozzle core 2 passes through the through hole and exposes the glue inlet 21. Since the general nozzle system is set on the fixed mold plate, the nozzle core 2 extending from the through hole extends into the fixed mold plate and connects the glue inlet 21 with the mold cavity. In this way, by fixing the pressure plate 3, the nozzle core 2 can be fixed to the nozzle body 1, and the installation is convenient.

[0035] Specifically, the nozzle body 1 is formed with a mounting groove 12 for accommodating the pressing plate 3, and the positioning holes 13 and the like are arranged on the bottom surface of the mounting groove 12. The bottom surface of the mounting groove 12 is provided with a threaded hole 14, and the pressing plate 3 is provided with a corresponding countersunk hole 31, and a bolt is arranged in the countersunk hole 31, and the bolt is threadedly connected with the threaded hole 14, so that the pressing plate 3 and the nozzle body 1 are bolted.

[0036] In order to prevent the injection material from flowing out, a sealing ring 4 is clamped between the pressing plate 3 and the nozzle body 1 .

[0037] In order to fix the sealing ring 4, a boss 23 is formed on the side of the positioning part 22 of the nozzle core 2. The sealing ring 4 is sleeved outside the nozzle core 2 and one end thereof abuts against the boss 23. The nozzle body 1 is provided with a recess 15, which is located outside the positioning hole 13. The two sides of the sealing ring 4 are clamped between the side wall of the recess 15 and the nozzle core 2, and the two ends of the sealing ring 4 are clamped between the bottom surface of the recess 15 and the pressure plate 3. In addition, the sealing ring 4 is formed with a sheath 41, which is sleeved outside the nozzle core 2. Since the outer diameter of the sheath 41 is smaller than that of the sealing ring 4, the sheath 41 extends from between the through opening of the pressure plate 3 and the nozzle core 2.

[0038] A valve needle 6 is provided in the glue inlet 21, and the valve needle 6 penetrates the hot nozzle body 1 and extends into the corresponding glue inlet 21 to seal the glue inlet 21. Since each nozzle core 2 is provided with two glue inlets 21, two valve needles 6 are connected to one nozzle core 2. In addition, a guide sleeve 7 is provided in the flow channel 11 of the hot nozzle body 1, and the guide sleeve 7 is for each valve needle 6 on the nozzle core 2 to penetrate.

[0039] In order to save space, the nozzle core 2 on the nozzle body 1 is generally provided with multiple nozzle cores 2, and is arranged in a circumferential array. It can be understood that the present invention is described by some embodiments, and those skilled in the art know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A hot nozzle system for injection molding a cylindrical rod product, comprising a nozzle core connected to a flow channel, characterized in that: The nozzle core is formed with at least two glue inlets connected in parallel to the flow channel, and the glue inlets are symmetrically arranged with the axis of the barrel product as the center; It also includes a hot nozzle body, a nozzle core is arranged on the hot nozzle body, and the nozzle core and the hot nozzle body are fixed in the circumferential direction; The hot nozzle body is formed with a positioning hole, and one end of the nozzle core is formed with a positioning portion, which is inserted into the positioning hole, so that the nozzle core is initially fixed on the hot nozzle body; and the positioning hole is communicated with the flow channel, and when the positioning portion is inserted into the positioning hole for fixing, the flow channel on the hot nozzle body and the glue inlet of the nozzle core are connected in parallel.

2. The hot nozzle system according to claim 1, characterized in that: A pressing plate is fixedly connected to the hot nozzle body, and the pressing plate presses the nozzle core onto the hot nozzle body; a through hole is opened on the pressing plate, and the nozzle core passes through the through hole to expose the glue inlet.

3. The hot nozzle system according to claim 2, characterized in that: A mounting groove for accommodating a pressing plate is formed on the hot nozzle body.

4. The hot nozzle system according to claim 2, characterized in that: A sealing ring is clamped between the pressing plate and the hot nozzle body.

5. The hot nozzle system according to claim 4, characterized in that: The hot nozzle body is provided with a concave platform, and two sides of the sealing ring are clamped between the side wall of the concave platform and the nozzle core.

6. The hot nozzle system according to claim 5, characterized in that: The two ends of the sealing ring are clamped between the bottom surface of the concave platform and the pressing plate.

7. The hot nozzle system according to claim 4, characterized in that: A boss is formed on the side of the nozzle core, and a sealing ring is sleeved outside the nozzle core with one end abutting against the boss.

8. The hot nozzle system according to claim 4, characterized in that: The sealing ring is formed with a sheath which is arranged outside the nozzle core and extends from between the through opening of the pressing plate and the nozzle core.

9. The hot nozzle system according to claim 1, characterized in that: A valve needle is arranged in the glue inlet, and the valve needle penetrates the hot nozzle body and extends into the corresponding glue inlet.

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