Hot runner structure for preventing nozzle from loosening

Abstract

The utility model relates to hot runner injection molding field especially is a kind of hot runner structure to prevent core loose, including mounting panel, fixedly connected with the pipe fitting on the bottom end surface of mounting panel, the bottom end of pipe fitting is equipped with recess, the recess is positioning slot, and the bottom end of pipe fitting is spliced with threaded joint.The utility model, through the circumferential positioning of positioning slot and upper positioning insert block, the double fixed structure formed by the thread locking of threaded sleeve, need not rely on the elastic component of easy fatigue, can stably resist the radial force generated by melt high pressure impact, completely solve the problem of traditional interference fit loose, screw fatigue deformation leads to the circumferential rotation of core, significantly improve the circumferential stability of core installation, guarantee melt injection accuracy, effectively reduce product size deviation.

Description

Technical Field

[0001] This utility model relates to the field of hot runner injection molding, and in particular to a hot runner structure for preventing the nozzle core from loosening. Background Technology

[0002] The hot runner system is a key component in injection molds. It keeps the molten plastic in the runner in a molten state by heating, preventing the material from solidifying and clogging the runner, thereby improving injection efficiency and product quality. The nozzle, as the end component of the hot runner system, directly connects to the mold cavity and is responsible for accurately injecting the molten material into the cavity. Its installation stability is crucial to injection precision.

[0003] When applying for this utility model, the applicant, after searching, discovered a Chinese patent disclosed "A Hot Runner Structure for Preventing Nozzle Core Loosening," application number "202122162077.7." This patent mainly comprises a hot runner plate, a hot nozzle body, and a nozzle core. The hot runner plate is threadedly connected to the hot nozzle body in the middle, and the nozzle core is disposed at the bottom of the hot nozzle body. An installation groove is provided inside the hot nozzle body, a fixing plate is fixedly installed at the top of the installation groove, a first compression spring is fixedly installed at the bottom of the fixing plate, and a lifting plate is fixedly installed at the bottom of the first compression spring. The advantages of this utility model are: the rebound force of the first compression spring causes the lifting rod and the fixing rod to descend, and the top block at the bottom of the lifting rod presses against the force-bearing block at one end of the insertion rod, causing the insertion rod to move towards the nozzle core, so that the insertion rod is inserted into the insertion groove of the nozzle core and fixed. This device, through the fixing of the insertion rod, effectively prevents the nozzle core from loosening due to prolonged liquid impact, and the installation steps are simple.

[0004] Based on the aforementioned existing technology, it is known that during conventional fixed-method injection molding, the high-pressure impact of the melt generates continuous axial and radial forces on the nozzle core. The combined effect of these factors can easily lead to loosening of the interference fit and screw fatigue deformation, resulting in axial displacement or circumferential rotation of the nozzle core. This not only affects the melt injection accuracy and causes product dimensional deviations, but in severe cases, it can also cause melt leakage, damage mold components, and increase production costs. Utility Model Content

[0005] In view of this, the present invention provides a hot runner structure to prevent nozzle loosening. The main technical problem to be solved is that the high pressure impact of the melt during injection molding in the existing fixed method will generate continuous axial and radial forces on the nozzle. After the above factors are combined, it is easy to cause the interference fit to loosen and the screw to fatigue and deform, which will cause the nozzle to have axial displacement or circumferential rotation. This not only affects the melt injection accuracy and causes product size deviation, but also causes melt leakage, damages mold components, and increases production costs in severe cases.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a hot runner structure for preventing nozzle loosening, comprising a mounting plate, wherein a connecting pipe is fixedly connected to the bottom end surface of the mounting plate, the bottom end of the connecting pipe is provided with a groove, which is a positioning slot, a threaded connector is spliced ​​to the bottom end of the connecting pipe, an upper positioning block is fixedly connected to the top end surface of the threaded connector, the upper positioning block matches the positioning slot, external threads are provided on the outer peripheral surfaces of the threaded connector and the connecting pipe, and threaded sleeves are installed on the outer sides of the connecting pipe and the threaded connector.

[0007] By adopting the above technical solution, circumferential positioning is formed by the positioning groove of the connecting pipe and the upper positioning block of the threaded joint. Then, the threaded sleeve locks the connecting pipe and the threaded joint together, forming a double fixing structure. It can stably resist the radial force generated by the high pressure impact of the melt without relying on elastic components. It completely solves the problem of circumferential rotation of the nozzle core caused by interference fit loosening and screw fatigue deformation in traditional structures, significantly improves the circumferential stability of the connection between the mounting plate, connecting pipe and threaded joint, and ensures the accuracy of melt injection.

[0008] As a further description of the above technical solution: the threaded sleeve is used to limit the threaded joint and the connecting pipe fitting, and a press-fitting pipe fitting is fixedly connected to the inner wall of the connecting pipe fitting, and the press-fitting pipe fitting is a hollow pipeline structure.

[0009] By adopting the above technical solution, the threaded sleeve can effectively limit the threaded joint and the connecting pipe, preventing relative displacement between the two during operation; the press-fit connecting pipe fixed on the inner wall of the connecting pipe is a hollow pipeline structure, which can provide a channel for melt transportation and a structural foundation for the installation and positioning of subsequent components, further enhancing the connection reliability of the overall structure.

[0010] As a further description of the above technical solution: the diameter of the press-fit connector is smaller than the diameter of the connector, and the outer diameter of the press-fit connector is consistent with the inner diameter of the threaded joint.

[0011] By adopting the above technical solution, the diameter of the press-fitting pipe is smaller than the diameter of the pipe fitting, and the outer diameter of the press-fitting pipe is consistent with the inner diameter of the threaded joint. This size design ensures that the press-fitting pipe can form a tight fit when inserted into the threaded joint, effectively improving the coaxiality and sealing performance of the connection between the pipe fitting and the threaded joint, and creating favorable conditions for stable melt delivery.

[0012] As a further description of the above technical solution: the press-fit pipe is used to be inserted into the threaded joint, and the bottom of the inner wall of the threaded joint is fixedly connected to a mounting base plate, which is an annular structure.

[0013] By adopting the above technical solution, the press-fit pipe can be inserted into the threaded joint, realizing the precise positioning of the pipe fitting and the threaded joint; the mounting base plate fixed at the bottom of the inner wall of the threaded joint is a ring structure, which can provide a stable mounting support surface for subsequent components, enhance the load-bearing capacity and stability of the internal structure of the threaded joint, and lay the foundation for the reliable assembly of the overall structure.

[0014] As a further description of the above technical solution: an inner positioning block is fixedly connected to the top surface of the mounting substrate. The inner positioning block has an arc-shaped structure and there are a total of six inner positioning blocks.

[0015] By adopting the above technical solution, the inner positioning blocks fixed on the top surface of the mounting base are arc-shaped and there are a total of six. The large number of arc-shaped inner positioning blocks can provide multi-directional circumferential positioning support for subsequent mating parts. Compared with a single positioning structure, it can greatly improve the reliability of positioning and impact resistance, and avoid circumferential displacement of mating parts.

[0016] As a further description of the above technical solution: the six internal positioning blocks are fixedly arranged in a ring array on the top surface of the mounting base plate.

[0017] By adopting the above technical solution, six internal positioning blocks are fixed in a ring array on the top surface of the mounting base plate, so that the circumferential positioning force is evenly distributed on the mounting base plate, ensuring the force balance after the subsequent mating components are installed, effectively avoiding structural loosening caused by excessive local force, and further improving the circumferential stability of component installation.

[0018] As a further description of the above technical solution: a support pressure plate is inserted inside the threaded joint. The main body of the support pressure plate is an annular structure, and the support pressure plate is pressed and limited downward by the press-fitting pipe. By adopting the above technical solution, the main body of the support plate inserted inside the threaded joint is a ring structure. Furthermore, the support plate is pressed and limited downwards by the press-fitting pipe. This pressing and limiting method effectively restricts the axial displacement of the support plate, preventing the support plate from loosening due to high-pressure impact from the molten material, and significantly enhancing the axial stability of the support plate installation.

[0019] As a further description of the above technical solution: the bottom end surface of the support plate is provided with splicing slots in a ring array, the splicing slots are matched with the inner positioning block, and the inner side of the support plate is fixedly connected with a nozzle.

[0020] By adopting the above technical solution, the splicing slots arranged in a ring array on the bottom surface of the support plate match the inner positioning blocks, which can realize the circumferential positioning of the support plate and the mounting base plate; the nozzle fixed inside the support plate, through the synergistic effect of axial pressing (pressure fitting pipe action) and circumferential positioning (sponging slots and inner positioning blocks), ensures that the nozzle is installed firmly, avoids displacement or rotation, and ensures that the melt is accurately injected into the mold cavity.

[0021] By employing the above technical solution, the hot runner structure for preventing nozzle loosening of this utility model has at least the following beneficial effects: 1. Compared with existing technologies, this hot runner structure that prevents nozzle loosening forms a double fixing structure through the circumferential positioning of the positioning slot and the upper positioning block, and the threaded locking of the threaded sleeve. It does not rely on easily fatigued elastic components and can stably resist the radial force generated by the high pressure impact of the melt. It completely solves the problem of nozzle circumferential rotation caused by the loosening of traditional interference fit and the fatigue deformation of screws, significantly improves the circumferential stability of nozzle installation, ensures melt injection accuracy, and effectively reduces product size deviation.

[0022] 2. Compared with existing technologies, this hot runner structure for preventing nozzle loosening forms a comprehensive rigid fixing system by using the axial pressing of the support plate by the press-fitting pipe and the circumferential limiting of the inner positioning block and splicing slot. This system can continuously counteract the axial force generated by the melt impact, preventing axial displacement of the nozzle. At the same time, through the coordinated limiting of multiple rigid structures, it eliminates the melt leakage problem caused by fixing failure, reduces the risk of mold component damage, and thus reduces production costs. It comprehensively solves the problem that existing fixing methods cannot cope with nozzle loosening caused by the superposition of axial and radial forces and a series of subsequent production problems. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the front view of the disassembled hot runner structure for preventing nozzle loosening proposed in this utility model. Figure 2 This is a schematic diagram of a combined structure for a heat runner structure to prevent the nozzle core from loosening, as proposed in this utility model. Figure 3 This is a schematic diagram of the combined structure of the nozzle fitting and the press-fit nozzle for a hot runner structure that prevents nozzle core loosening, as proposed in this utility model. Figure 4 A schematic diagram of the combined structure of the threaded structure and the upper positioning block of the hot runner structure for preventing the nozzle core from loosening, as proposed in this utility model. Figure 5 This is a schematic diagram of the combined structure of the support plate and splicing slot of the hot runner structure for preventing nozzle loosening proposed in this utility model; Figure 6This is a front view schematic diagram of a hot runner structure for preventing nozzle loosening proposed in this utility model.

[0024] Legend: 1. Mounting plate; 101. Connecting pipe fitting; 1011. Positioning slot; 1012. Press-fit connecting pipe; 2. Threaded connector; 201. Threaded sleeve; 2011. Upper positioning insert; 2012. Mounting base plate; 2013. Inner positioning insert; 3. Support plate; 301. Splicing slot; 3011. Nozzle. Detailed Implementation

[0025] Reference Figures 1-6 The present invention provides a hot runner structure for preventing nozzle core loosening: including a mounting plate 1, a connecting pipe 101 fixedly connected to the bottom end surface of the mounting plate 1, a groove is provided at the bottom end of the connecting pipe 101, the groove is a positioning slot 1011, a threaded connector 2 is spliced ​​at the bottom end of the connecting pipe 101, an upper positioning block 2011 is fixedly connected to the top end surface of the threaded connector 2, the upper positioning block 2011 matches the positioning slot 1011, external threads are provided on the outer peripheral surfaces of the threaded connector 2 and the connecting pipe 101, and a threaded sleeve 201 is installed on the outer side of the connecting pipe 101 and the threaded connector 2.

[0026] Furthermore, the threaded sleeve 201 is used to limit the threaded connector 2 and the connecting pipe 101. The inner wall of the connecting pipe 101 is fixedly connected to the press-fit connecting pipe 1012, which is a hollow pipe structure.

[0027] Furthermore, the diameter of the press-fit connector 1012 is smaller than the diameter of the connector 101, and the outer diameter of the press-fit connector 1012 is consistent with the inner diameter of the threaded connector 2.

[0028] Furthermore, the press-fit pipe 1012 is used to insert into the threaded connector 2, and the bottom of the inner wall of the threaded connector 2 is fixedly connected to the mounting base plate 2012, which has an annular structure.

[0029] Furthermore, an inner positioning block 2013 is fixedly connected to the top surface of the mounting base plate 2012. The inner positioning block 2013 has an arc-shaped structure and a total of six positions are provided on the inner positioning block 2013.

[0030] Furthermore, six internal positioning blocks 2013 are fixedly arranged in a ring array on the top surface of the mounting base plate 2012.

[0031] Furthermore, a support plate 3 is inserted inside the threaded joint 2. The main body of the support plate 3 is a ring structure, and the support plate 3 is pressed and limited downward by the press-fitting pipe 1012.

[0032] Furthermore, the bottom surface of the support plate 3 is provided with splicing slots 301 in a ring array. The splicing slots 301 match the inner positioning block 2013, and the inner side of the support plate 3 is fixedly connected with a nozzle 3011.

[0033] Working principle: First, the upper positioning block 2011 at the top of the threaded connector 2 is precisely inserted into the positioning slot 1011 of the bottom pipe fitting 101 of the mounting plate 1. The initial axial positioning of the pipe fitting 101 and the threaded connector 2 is achieved by matching the shape of the positioning slot 1011 and the upper positioning block 2011, so as to avoid relative circumferential displacement between the two in subsequent assembly and operation. Then, the threaded sleeve 201 is fitted onto the outside of the connecting pipe 101 and the threaded joint 2. The internal thread of the threaded sleeve 201 is screwed and locked with the external thread on the outer circumference of the connecting pipe 101 and the threaded joint 2. The continuous locking force generated by the threaded connection further fixes the axial position of the connecting pipe 101 and the threaded joint 2, and eliminates the assembly gap at the joint. The press-fit pipe 1012, which is fixedly connected to the inner wall of the pipe fitting 101, is naturally inserted into the inner hole of the threaded joint 2 as the pipe fitting 101 is spliced ​​with the threaded joint 2. Since the outer diameter of the press-fit pipe 1012 matches the inner diameter of the threaded joint 2, the two form a tight fit relationship, providing a precise axial positioning reference for the installation of the support plate 3. The support plate 3 with the nozzle 3011 fixed is inserted into the threaded joint 2 from the bottom end, so that the splicing slot 301 opened at the bottom end of the support plate 3 is aligned with the inner positioning block 2013 on the mounting base plate 2012 at the bottom end of the inner wall of the threaded joint 2 and is engaged. Through the cooperation of the splicing slot 301 and the inner positioning block 2013, the support plate 3 and the threaded joint 2 are circumferentially fixed, and the circumferential rotation of the support plate 3 is restricted. The bottom end of the press-fit pipe 1012 inserted into the threaded joint 2 is in close contact with the top surface of the support plate 3. The structural rigidity of the press-fit pipe 1012 itself applies a continuous downward pressing force to the support plate 3, which firmly fixes the support plate 3 inside the threaded joint 2, thereby achieving the axial positioning of the nozzle 3011. When the hot runner system starts working, the plastic melt enters the hollow press-fit connector 1012 through the connector 101, and is then transported to the threaded joint 2 through the press-fit connector 1012. Finally, it is precisely injected into the mold cavity through the nozzle 3011 inside the support plate 3. During this process, the threaded sleeve 201 always keeps the connector 101 and the threaded joint 2 locked together, the press-fit connector 1012 continuously applies pressure to the support plate 3, and the inner positioning block 2013 and the splicing slot 301 are stably engaged. The three work together to resist the axial and radial forces generated by the high pressure impact of the melt, ensuring that the nozzle 3011 always remains fixed and does not loosen, shift, or rotate.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hot runner structure for preventing nozzle loosening, comprising a mounting plate (1), characterized in that: A connecting pipe (101) is fixedly connected to the bottom end of the mounting plate (1). The bottom end of the connecting pipe (101) is provided with a groove, which is a positioning slot (1011). A threaded connector (2) is spliced ​​to the bottom end of the connecting pipe (101). An upper positioning block (2011) is fixedly connected to the top end of the threaded connector (2). The upper positioning block (2011) matches the positioning slot (1011). External threads are provided on the outer circumferential surfaces of the threaded connector (2) and the connecting pipe (101). A threaded sleeve (201) is installed on the outer side of the connecting pipe (101) and the threaded connector (2).

2. The hot runner structure for preventing nozzle loosening according to claim 1, characterized in that: The threaded sleeve (201) is used to limit the threaded joint (2) and the connecting pipe (101). The inner wall of the connecting pipe (101) is fixedly connected to the press-fit pipe (1012), which is a hollow pipe structure.

3. The hot runner structure for preventing nozzle loosening according to claim 2, characterized in that: The diameter of the press-fit connector (1012) is smaller than the diameter of the connector (101), and the outer diameter of the press-fit connector (1012) is consistent with the inner diameter of the threaded connector (2).

4. The hot runner structure for preventing nozzle loosening according to claim 3, characterized in that: The press-fit connector (1012) is used to insert into the threaded connector (2). The bottom of the inner wall of the threaded connector (2) is fixedly connected to the mounting base plate (2012), which is an annular structure.

5. A hot runner structure for preventing nozzle loosening according to claim 4, characterized in that: An inner positioning block (2013) is fixedly connected to the top surface of the mounting base plate (2012). The inner positioning block (2013) has an arc-shaped structure and a total of six positions are provided on the inner positioning block (2013).

6. The hot runner structure for preventing nozzle loosening according to claim 5, characterized in that: The six internal positioning blocks (2013) are fixedly arranged in a ring array on the top surface of the mounting base plate (2012).

7. The hot runner structure for preventing nozzle loosening according to claim 4, characterized in that: The threaded connector (2) has a support plate (3) inserted inside. The main body of the support plate (3) is a ring structure, and the support plate (3) is pressed down and limited by the press-fitting pipe (1012).

8. The hot runner structure for preventing nozzle loosening according to claim 7, characterized in that: The bottom surface of the support plate (3) is provided with splicing slots (301) in a ring array. The splicing slots (301) match the inner positioning block (2013), and the inner side of the support plate (3) is fixedly connected with a nozzle (3011).

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