A multi-point hot nozzle structure for precision mold injection molding

Abstract

The utility model relates to the technical field of hot runner injection molding, and discloses a multi-point hot nozzle structure for precision mold injection molding, including a hanging platform with a flow channel inside, a plurality of mounting holes are opened on the hanging platform, and a hot nozzle body is arranged in each of the mounting holes; the mounting hole includes a positioning part and a supporting part which are interconnected, and the hot nozzle body includes an axial body part, one end of the axial body part is equipped with a nozzle assembly, and the other end is connected with a shaft neck part and a shaft end part in sequence; based on the cooperation of the positioning part and the supporting part with the shaft end part and the shaft neck part respectively, the hot nozzle body can be arranged on the hanging platform through the mounting hole; and arranging multiple hot nozzle bodies on the same hanging platform in this way can not only meet the multi-point injection molding process, but also reduce the area occupied by a single hot nozzle body, thereby avoiding the waste of template space and reducing the manufacturing cost of the mold.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runner injection molding, in particular to a multi-point hot nozzle structure for precision mold injection molding. Background Art

[0002] Among many types of molds, precision molds have relatively high assembly size requirements. It refers to the device that injects plastic melt into the metal model along the hot runner to obtain a product with a certain shape. The hot nozzle is also called the hot runner nozzle. It is an important component of the hot runner system in multi-cavity molds; it can deliver the plastic melt in the hot runner manifold to the product or runner surface through itself, and maintain the melting temperature so that the plastic does not decompose, so as to ensure that the valve needle can operate smoothly in the hot nozzle.

[0003] In the hot runner injection molding process, usually a set of hot nozzles is used for each cavity to ensure the balance of the plastic melt; however, when a single ordinary hot nozzle is used, due to the large area of ​​the hot nozzle base, it occupies a large area under the same conditions. This results in some hot nozzles being unable to be used when the product arrangement is compact and the template and injection molding machine cannot be changed; even if these hot nozzles are used, it will cause a waste of template space and increase the manufacturing cost of the mold. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a multi-point hot nozzle structure for precision mold injection molding, wherein a plurality of hot nozzle bodies are arranged on a hanging platform, and the hot nozzle bodies are connected to the hanging platform through mounting holes, and the plastic melt first flows into the flow channel inside the hanging platform through a glue inlet, and then enters the corresponding hot nozzle body along the flow channel, and finally is ejected through a nozzle assembly; in this way, the multi-point injection molding process can be satisfied, and the area occupied by a single hot nozzle body can be reduced, so as to avoid wasting template space and reduce the manufacturing cost of the mold.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A multi-point hot nozzle structure for precision mold injection molding, comprising a hanging platform with a flow channel inside, a plurality of mounting holes are opened on the hanging platform, a hot nozzle body is arranged in each mounting hole, and one end of the hot nozzle body passes through the mounting hole and extends to the outside of the hanging platform;

[0007] The mounting hole includes a positioning portion and a supporting portion which are interconnected, and the hot nozzle body includes an axial body portion located outside the hanging platform, one end of the axial body portion is installed with a nozzle assembly, and the other end is sequentially connected with a shaft neck portion and a shaft end portion which can be respectively embedded in the supporting portion and the positioning portion;

[0008] The hanging platform is also provided with a glue inlet communicated with the flow channel, and the mounting hole and the hot nozzle body are both communicated with the flow channel, and the nozzle assembly is communicated with the flow channel through the hot nozzle body.

[0009] In a preferred embodiment of the utility model, the inner diameter of the positioning portion is larger than the inner diameter of the supporting portion, and the positioning portion is located at the upper end of the supporting portion; the shaft end portion, the shaft neck portion and the shaft body portion adopt an integrally formed structure, and the outer diameters of the three decrease successively along the axial direction.

[0010] In a preferred embodiment of the utility model, a second positioning groove connected to the mounting hole is provided on the hanging platform, a first positioning hole corresponding to the position of the second positioning groove is provided on the outer circumferential surface of the shaft end, and both ends of the first positioning pin are respectively embedded in the first positioning hole and the second positioning groove.

[0011] In a preferred embodiment of the utility model, a base is installed at the lower part of the hanging platform near the edge, and the base is fixedly connected to the hanging platform by a bolt assembly.

[0012] In a preferred embodiment of the utility model, a first positioning groove is provided on the outer circumferential surface of the hanging platform, a second positioning hole corresponding to the position of the first positioning groove is provided on the end surface of the base, and both ends of the second positioning pin are respectively embedded in the second positioning hole and the first positioning groove.

[0013] In a preferred embodiment of the utility model, a valve needle guide sleeve is installed at the upper end of the shaft end, and one end of the valve needle guide sleeve protrudes from the top surface of the hanging platform.

[0014] In a preferred embodiment of the utility model, a heater is sleeved on the outer circumferential surface of the shaft body, and the heater is located below the hanging platform.

[0015] In a preferred embodiment of the utility model, the nozzle assembly includes a nozzle body whose upper portion can be embedded in the shaft body, a flange for positioning is arranged on the outer side of the middle portion of the nozzle body, a fastener is screwed into the lower portion of the nozzle body, a guide ring is arranged above the fastener, and a retaining spring for supporting the heater is arranged between the guide ring and the flange.

[0016] In a preferred embodiment of the utility model, the glue inlet is located at the center of the top surface of the hanging platform, four mounting holes are provided, and the four mounting holes are distributed in a circular array around the axis of the glue inlet. Beneficial Effects

[0017] In the utility model, based on the cooperation between the positioning part and the supporting part and the shaft end and the shaft neck respectively, the hot nozzle body can be set on the hanging table through the mounting hole; and multiple hot nozzle bodies are set on the same hanging table in this way, which can not only meet the multi-point injection molding process, but also reduce the area occupied by a single hot nozzle body, thereby avoiding the waste of template space and reducing the manufacturing cost of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the explosion structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the assembly structure of the hot nozzle body and the heater of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the mounting hole of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the hot nozzle body of the utility model;

[0023] Figure 6 It is a schematic diagram of the position structure of the first positioning groove and the second positioning hole of the utility model;

[0024] Figure 7 It is a schematic diagram of the position structure of the first connecting hole and the second connecting hole of the utility model;

[0025] Among them, 1. hanging platform; 11. glue inlet; 12. gasket; 13. sink; 14. first connecting hole; 15. first positioning groove; 2. mounting hole; 21. positioning part; 22. supporting part; 23. second positioning groove; 3. hot nozzle body; 31. shaft end; 32. shaft neck; 33. shaft body; 34. first positioning hole; 4. valve needle guide sleeve; 5. nozzle assembly; 51. nozzle body; 52. retaining spring; 53. guide ring; 54. fastener; 6. heater; 7. base; 71. second connecting hole; 72. second positioning hole. DETAILED DESCRIPTION

[0026] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0027] like Figure 1-Figure 6 As shown, a multi-point hot nozzle structure for precision mold injection molding includes a hanging platform 1, a base 7, a plurality of hot nozzle bodies 3, and valve needle guide sleeves 4, a nozzle assembly 5 and a heater 6 whose number and position correspond to the hot nozzle bodies 3.

[0028] The hanging platform 1 is provided with mounting holes 2 corresponding to the number and position of the hot nozzle body 3, and the position of the mounting hole 2 can be adjusted according to the process requirements; that is, a hot nozzle body 3 is arranged in each mounting hole 2, and one end of the hot nozzle body 3 extends through the mounting hole 2 to the outside of the hanging platform 1.

[0029] As mentioned above, the mounting hole 2 includes a positioning portion 21 and a supporting portion 22 which are interconnected, and the hot nozzle body 3 includes an axial body portion 33 located on the outside of the hanging platform 1, and a nozzle assembly 5 is installed at one end of the axial body portion 33, and the other end is connected in sequence with a shaft neck portion 32 and a shaft end portion 31 which can be respectively embedded in the supporting portion 22 and the positioning portion 21.

[0030] The external valve needle can pass through the valve needle guide sleeve 4 to control the opening and closing of the channel in the hot nozzle body 3. The valve needle guide sleeve 4 can be installed with a 2.5mm valve needle, which is installed at the upper end of the shaft end 31, and one end of the valve needle guide sleeve 4 protrudes from the top surface of the hanging platform 1 and is fixedly connected to the shaft end 31 by an interference fit.

[0031] A flow channel for the flow of plastic melt is provided inside the hanging platform 1, and a glue inlet 11 connected to the flow channel is also provided on the hanging platform 1, and the mounting hole 2 and the hot nozzle body 3 are both connected to the flow channel, and the nozzle assembly 5 is connected to the flow channel through the hot nozzle body 3. At this time, the plastic melt first flows into the flow channel inside the hanging platform 1 through the glue inlet 11, then enters the corresponding hot nozzle body 3 along the flow channel, and finally is ejected through the nozzle assembly 5.

[0032] In order to facilitate the injection of glue, the glue inlet 11 has a diameter of 5 mm and is located at the center of the top surface of the hanging platform 1. At the same time, a gasket 12 for sealing and preventing melt leakage is also provided at the position of the glue inlet 11; and there are four mounting holes 2, and the four mounting holes 2 are distributed in a circular array around the axis of the glue inlet 11.

[0033] Furthermore, the mounting hole 2 adopts a stepped hole structure, the inner diameter of the positioning portion 21 is larger than the inner diameter of the supporting portion 22, and the positioning portion 21 is located at the upper end of the supporting portion 22; the hot nozzle body 3 adopts a stepped shaft structure. In order to facilitate the processing of the hot nozzle body 3, its shaft end 31, shaft neck portion 32 and shaft body portion 33 are integrally formed and connected, and the outer diameters of the three decrease successively along the axial direction, that is, along the axial direction from the shaft end 31 to the shaft body portion 33, the outer diameters of the three decrease successively.

[0034] In addition, a second positioning groove 23 connected to the mounting hole 2 is opened on the hanging platform 1, and a first positioning hole 34 corresponding to the position of the second positioning groove 23 is opened on the outer circumferential surface of the shaft end 31, and the two ends of the first positioning pin are respectively embedded in the first positioning hole 34 and the second positioning groove 23.

[0035] The first positioning hole 34 is provided on the outer side surface of the shaft end portion 31, and the second positioning groove 23 is provided on the inner side surface of the positioning portion 21; the hot nozzle body 3 is connected with the flow channel inside the hanging platform 1. In order to avoid the position of the connection between the two from being offset, one end of the first positioning pin can be embedded in the first positioning hole 34 in an interference fit manner, and the other end of the first positioning pin is embedded in the second positioning groove 23. Under the action of the first positioning pin, the circumferential positioning between the hot nozzle body 3 and the mounting hole 2 can be achieved, and the hot nozzle body 3 can be prevented from rotating around its own axis, so as to avoid the position of the hot nozzle body 3 and the flow channel from being offset; this structure can improve the stability and accuracy of plastic melt injection molding.

[0036] When the hot nozzle body 3 is assembled with the hanging table 1, one end of the first positioning pin is first fixedly embedded in the first positioning hole 34, and then the hot nozzle body 3 is passed through the mounting hole 2 from top to bottom from one end of the shaft body 33, and then the shaft neck 32 is embedded in the supporting portion 22 of the mounting hole 2, and the shaft end 31 is embedded in the positioning portion 21 of the mounting hole 2. At the same time, the other end of the first positioning pin is embedded in the second positioning groove 23 from top to bottom. Based on the limitation between the first positioning pin and the inner side surface of the second positioning groove 23, the circumferential positioning of the hot nozzle body 3 can be completed.

[0037] Since the inner diameter of the positioning portion 21 is larger than the inner diameter of the supporting portion 22, a boss is formed between the two. Since the diameter of the shaft end portion 31 is larger than the diameter of the journal portion 32, the top surface of the boss contacts the end surface of the shaft end portion 31 on the side close to the journal portion 32, thereby completing the axial positioning of the hot nozzle body 3; and the outer diameter circumferential surfaces of the shaft end portion 31 and the journal portion 32 are respectively fitted with the inner diameter circumferential surfaces of the positioning portion 21 and the supporting portion 22.

[0038] Arranging a plurality of hot nozzle bodies 3 on the same hanging platform 1 in the above manner can not only meet the multi-point injection molding process, but also reduce the area occupied by a single hot nozzle body 3, thereby avoiding waste of template space and reducing the manufacturing cost of the mold.

[0039] like Figure 1-Figure 3 , Figure 7 As shown, a base 7 is installed near the edge of the lower part of the hanging platform 1, and the base 7 is fixedly connected to the hanging platform 1 by a bolt assembly. The base 7 adopts a circular ring structure, and its function is to insulate heat. If the hanging platform 1 is in direct contact with the template, the heat of the hot nozzle body 3 and the template will increase.

[0040] Specifically, a recessed groove 13 is provided at the upper edge of the hanging platform 1, a first connecting hole 14 penetrating the hanging platform 1 is provided at the bottom of the recessed groove 13, and a second connecting hole 71 corresponding to the position of the first connecting hole 14 is provided on the base 7; when the first connecting hole 14 is coaxial with the second connecting hole 71, the bolts in the bolt assembly can pass through the first connecting hole 14 and the second connecting hole 71 in sequence from top to bottom, and then a nut is screwed on the lower part of the bolt to complete the connection between the base 7 and the hanging platform 1; and the bolt head can also be embedded in the recessed groove 13 to ensure the flatness of the top surface of the hanging platform 1 and facilitate the installation of other components.

[0041] like Figure 6 As shown, a first positioning groove 15 is provided on the outer circumferential surface of the hanging platform 1, a second positioning hole 72 corresponding to the position of the first positioning groove 15 is provided on the end surface of the base 7, and two ends of the second positioning pin are respectively embedded in the second positioning hole 72 and the first positioning groove 15.

[0042] When installing the base 7 and the hanging platform 1, first fix one end of the second positioning pin in the second positioning hole 72. As the base 7 contacts the hanging platform 1, the other end of the second positioning pin enters the first positioning groove 15. At this time, the first connecting hole 14 and the second connecting hole 71 are in a coaxial position. This structure can realize rapid positioning between the first connecting hole 14 and the second connecting hole 71, making it convenient for the bolt assembly to fix the base 7 and the hanging platform 1.

[0043] The first positioning pin and the second positioning pin (neither of which is shown in the figure) are both existing pins, which can be fixedly installed with the first positioning hole 34 and the second positioning hole 72 by interference fit.

[0044] like Figure 2-Figure 3 As shown, a heater 6 is sleeved on the outer circumferential surface of the shaft body 33, and the heater 6 is located below the hanging platform 1. The heater 6 adopts an existing heating tube, and the inner wall of the heating tube contacts the outer wall of the shaft body 33, which can generate heat and transfer it to the shaft body 33 to ensure that the plastic melt inside is always in a molten state, avoiding the plastic melt from being cooled and solidified to cause channel blockage.

[0045] like Figure 2 As shown, the nozzle assembly 5 includes a nozzle body 51 whose upper portion can be embedded in the shaft body 33, a flange for positioning is arranged on the outer middle portion of the nozzle body 51, a fastener 54 is screwed into the lower portion of the nozzle body 51, a guide ring 53 is arranged above the fastener 54, and a retaining spring 52 for supporting the heater 6 is arranged between the guide ring 53 and the flange, and the fastener 54, the guide ring 53 and the retaining spring 52 are all sleeved on the nozzle body 51.

[0046] The nozzle body 51 adopts the existing injection molding nozzle, and its function is to accurately deliver the plastic melt flowing through the hot nozzle body 3 into the corresponding cavity; the nozzle body 51 can achieve axial positioning with the hot nozzle body 3 through the flange, and the fastener 54 adopts a nut. Under the action of the fastener 54, the retaining spring 52 can be firmly fixed under the flange through the guide ring 53, and the retaining spring 52 is the existing elastic retaining ring for the shaft; the upper end of the heater 6 is in contact with the ground of the hanging platform 1, and the lower end is supported by the retaining spring 52, based on this, the axial positioning of the heater 6 on the shaft body 33 can be achieved.

[0047] Working principle:

[0048] When the hot nozzle body 3 and the hanging platform 1 are assembled, one end of the first positioning pin is first fixedly embedded in the first positioning hole 34, and then the hot nozzle body 3 is passed through the mounting hole 2 from top to bottom from one end of the shaft body 33, and then the shaft neck portion 32 is embedded in the supporting portion 22 of the mounting hole 2, and the shaft end portion 31 is embedded in the positioning portion 21 of the mounting hole 2 until the shaft end portion 31 contacts the top surface of the boss; at the same time, the other end of the first positioning pin is embedded in the second positioning groove 23 from top to bottom, and based on the limitation between the first positioning pin and the inner side surface of the second positioning groove 23, the circumferential positioning of the hot nozzle body 3 can be completed.

[0049] In summary, by arranging multiple hot nozzle bodies 3 on the same hanging platform 1 in the above manner, it can not only meet the multi-point injection molding process, but also reduce the area occupied by a single hot nozzle body 3, thereby avoiding the waste of template space and reducing the manufacturing cost of the mold.

[0050] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A multi-point hot nozzle structure for precision mold injection molding, characterized in that: It comprises a hanging platform (1) having a flow channel inside, the hanging platform (1) being provided with a plurality of mounting holes (2), a hot nozzle body (3) being arranged in each of the mounting holes (2), and one end of the hot nozzle body (3) passing through the mounting hole (2) and extending to the outside of the hanging platform (1); The mounting hole (2) comprises a positioning portion (21) and a supporting portion (22) which are interconnected, the hot nozzle body (3) comprises a shaft portion (33) located outside the hanging platform (1), one end of the shaft portion (33) being mounted with a nozzle assembly (5), and the other end being sequentially connected with a shaft neck portion (32) and a shaft end portion (31) which can be respectively embedded in the supporting portion (22) and the positioning portion (21); The hanging platform (1) is also provided with a glue inlet (11) connected to the flow channel, and the mounting hole (2) and the hot nozzle body (3) are both connected to the flow channel, and the nozzle assembly (5) is connected to the flow channel through the hot nozzle body (3).

2. The multi-point hot nozzle structure for precision mold injection molding according to claim 1, characterized in that: The inner diameter of the positioning portion (21) is greater than the inner diameter of the supporting portion (22), and the positioning portion (21) is located at the upper end of the supporting portion (22); the shaft end portion (31), the shaft neck portion (32) and the shaft body portion (33) adopt an integrally formed structure, and the outer diameters of the three decrease successively along the axial direction.

3. The multi-point hot nozzle structure for precision mold injection molding according to claim 2, characterized in that: The hanging platform (1) is provided with a second positioning groove (23) communicating with the mounting hole (2), the outer circumferential surface of the shaft end (31) is provided with a first positioning hole (34) corresponding to the position of the second positioning groove (23), and two ends of a first positioning pin are respectively embedded in the first positioning hole (34) and the second positioning groove (23).

4. The multi-point hot nozzle structure for precision mold injection molding according to claim 1, characterized in that: A base (7) is installed at the lower part of the hanging platform (1) near the edge, and the base (7) is fixedly connected to the hanging platform (1) via a bolt assembly.

5. The multi-point hot nozzle structure for precision mold injection molding according to claim 4, characterized in that: A first positioning groove (15) is provided on the outer circumferential surface of the hanging platform (1), a second positioning hole (72) corresponding to the position of the first positioning groove (15) is provided on the end surface of the base (7), and two ends of a second positioning pin are respectively embedded in the second positioning hole (72) and the first positioning groove (15).

6. The multi-point hot nozzle structure for precision mold injection molding according to claim 1, characterized in that: A valve needle guide sleeve (4) is mounted on the upper end of the shaft end portion (31), and one end of the valve needle guide sleeve (4) protrudes from the top surface of the hanging platform (1).

7. The multi-point hot nozzle structure for precision mold injection molding according to claim 1, characterized in that: A heater (6) is sleeved on the outer circumferential surface of the shaft body (33), and the heater (6) is located below the hanging platform (1).

8. The multi-point hot nozzle structure for precision mold injection molding according to claim 7, characterized in that: The nozzle assembly (5) comprises a nozzle body (51) whose upper portion can be embedded in the shaft body (33); a flange for positioning is arranged on the outer side of the middle portion of the nozzle body (51); a fastener (54) is screwed into the lower portion of the nozzle body (51); a guide ring (53) is arranged above the fastener (54); and a retaining spring (52) for supporting the heater (6) is arranged between the guide ring (53) and the flange.

9. The multi-point hot nozzle structure for precision mold injection molding according to any one of claims 1 to 8, characterized in that: The glue inlet (11) is located at the center of the top surface of the hanging platform (1), and four mounting holes (2) are provided, and the four mounting holes (2) are distributed in a circular array around the axis of the glue inlet (11).

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