A needle valve type multi-head nozzle

Abstract

This utility model discloses a needle valve type multi-head nozzle, including a flow divider plate, a nozzle body, and a needle valve system. A main nozzle is provided on one side of the flow divider plate, and the other side is connected to several nozzle bodies. Each nozzle body corresponds to a set of needle valve systems. The nozzle body includes an injection port; several flow divider channels extend obliquely downward from the injection port; the lower part of each flow divider channel is connected to a sub-material chamber; a valve needle channel is provided above each sub-material chamber, and the lower part is connected to a nozzle core; the needle valve system includes a drive valve, a piston, and several sub-valve needles; the piston is connected to the drive valve; the upper end of the sub-valve needle is connected to the piston, and its lower part passes through the valve needle channel, the sub-material chamber, and then through the nozzle core; compared with the traditional needle valve type hot nozzle, the nozzle gate of this application can be made smaller, and the corresponding product arrangement can be more compact and flexible, which can reduce mold space and reduce mold cost.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, and in particular to a needle valve type multi-head nozzle. Background Technology

[0002] In the field of injection molding, achieving efficient multi-cavity injection molding places higher demands on nozzle design. Traditional nozzles typically employ a single-nozzle, single-head design, which struggles to meet the needs of simultaneous injection molding of multi-cavity products and is prone to problems such as significant pressure loss, noticeable gate marks, and material waste during the injection process. While existing multi-head nozzle structures have addressed these issues to some extent, they still suffer from drawbacks such as complex structure, high cost, and inconvenient maintenance. Therefore, a novel nozzle structure is urgently needed to overcome these shortcomings and meet the dual demands of production efficiency and product quality.

[0003] Conventional needle valve type hot runner nozzles are large and take up a lot of space, which limits their application in some multi-cavity molds. This utility model provides a needle valve type multi-head nozzle that can meet the needs of small gate spacing and four gates per product, and is easy to be widely used in needle valve type hot runner systems for small-pitch multi-cavity molds. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the current needle valve type hot runner, this utility model provides a needle valve type multi-head nozzle, which can be widely used in needle valve type hot runner systems for small-pitch multi-cavity molds.

[0005] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0006] A needle valve type multi-nozzle includes a flow divider plate, a nozzle body, and a needle valve system. A main nozzle is located on one side of the flow divider plate, and the other side is connected to several nozzle bodies. Each nozzle body corresponds to a set of needle valve systems. The nozzle body includes a filling port; several flow divider channels extend obliquely downwards from the filling port; each flow divider channel communicates with a sub-material chamber below; each sub-material chamber has a valve needle channel above it and communicates with a nozzle core below it; the needle valve system includes a drive valve, a piston, and several sub-valve needles; the piston is connected to the drive valve; the upper end of each sub-valve needle is connected to the piston, and its lower part passes through the valve needle channel, the sub-material chamber, and then through the nozzle core; the angle between the flow divider channels and the vertical direction is between 10° and 20°; the flow divider channels are evenly distributed around the center of the filling port.

[0007] According to one aspect of the present invention, the number of nozzle cores on each of the nozzle bodies is four.

[0008] According to one aspect of this utility model, a transition zone is provided between the diversion channel and the sub-material cavity.

[0009] According to one aspect of the present invention, a sliding sleeve is provided at the upper end of the valve needle channel; the sub-valve needle passes through the sliding sleeve and enters the valve needle channel.

[0010] According to one aspect of the present invention, a nozzle heater is provided on the surface of the main nozzle; a nozzle heater is provided on the surface of the nozzle body; heating tubes are provided on both sides of the flow divider; and a ceramic connector is provided at the end of the heating tube.

[0011] According to one aspect of the present invention, the nozzle heater includes an upper section, a middle section, and a lower section.

[0012] According to one aspect of the present invention, a pad is provided between the needle valve system and the flow divider plate; a positioning plate is provided on the top of the drive valve.

[0013] According to one aspect of the present invention, the nozzle core is fixedly connected to the nozzle body via a connecting flange.

[0014] According to one aspect of the present invention, the angle between the diversion channel and the vertical direction is 15°.

[0015] Advantages of this utility model:

[0016] The drive valve drives the piston, which in turn drives the sub-valve needle to move up and down simultaneously within the nozzle body. This enables the synchronous opening or closing of multiple nozzle cores and the synchronous adjustment of the flow rate of molten plastic in multiple nozzle cores. It is suitable for injection molding of products with small-pitch multi-cavity molds, small gate spacing, and multiple gates. In addition, the needle valve system with a specific structure can control multiple nozzle cores simultaneously, which can effectively reduce waste, improve product quality, and enhance consistency. Compared with traditional needle valve hot runners, the nozzle gate of this application can be made smaller, allowing for a more compact and flexible product arrangement, reducing mold space, and lowering mold manufacturing costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments 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 structure of a needle valve type multi-head nozzle according to the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the nozzle body described in this utility model;

[0020] Figure 3This is a cross-sectional view of the nozzle body and needle valve system described in this utility model.

[0021] Legend: 1. Diverter plate; 11. Main nozzle; 111. Nozzle heater; 12. Heating element; 121. Ceramic connector; 2. Nozzle body; 21. Inlet; 22. Diverter channel; 221. Transition zone; 23. Sub-material chamber; 24. Valve needle channel; 241. Sliding sleeve; 25. Nozzle core; 251. Connecting flange; 26. Nozzle heater; 261. Upper section; 262. Middle section; 263. Lower section; 31. Drive valve; 32. Piston; 33. Sub-valve needle; 34. Pad; 35. Positioning plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1 , Figure 2 , Figure 3 As shown, a needle valve type multi-nozzle includes a flow divider plate 1, a nozzle body 2, and a needle valve system. A main nozzle 11 is disposed on one side of the flow divider plate 1, and several nozzle bodies 2 are connected to the other side. Each nozzle body 2 corresponds to a set of needle valve systems. The nozzle body 2 includes an injection port 21; several flow divider channels 22 extend obliquely downward from the injection port 21; each flow divider channel 22 is connected to a sub-material chamber 23 below; a valve needle channel 24 is disposed above each sub-material chamber 23, and is correspondingly connected to a nozzle core 25 below; the needle valve system includes a drive valve 31, a piston 32, and several sub-valve needles 33; the piston 32 is connected to the drive valve 31; the upper end of each sub-valve needle 33 is connected to the piston 32, and its lower part passes through the valve needle channel 24, the sub-material chamber 23, and then through the nozzle core 25; the angle between the flow divider channel 22 and the vertical direction is between 10° and 20°; the flow divider channels 22 are evenly distributed around the center of the injection port 21.

[0024] Molten plastic enters the manifold 1 through the main nozzle 11, is divided into several streams that enter the injection port 21, and then enter the corresponding sub-material chamber 23 through the manifold channel 22. The drive valve 31 drives the piston 32, which in turn drives the sub-valve needle 33 to move up and down simultaneously in the nozzle body 2, realizing the synchronous opening or closing of multiple nozzle cores 25 and synchronizing and adjusting the flow rate of molten plastic in multiple nozzle cores 25. This is suitable for injection molding of products with small-pitch multi-cavity molds, small gate spacing and multiple gates. In addition, the needle valve system with a specific structure can synchronously control multiple nozzle cores 25, which can effectively reduce waste, process better product quality and consistency. Compared with traditional needle valve hot nozzles, the nozzle gate of this application can be made smaller, and the corresponding product arrangement can be more compact and flexible, which can reduce mold space and reduce mold cost.

[0025] In this embodiment, the number of nozzle cores 25 on a single nozzle body 2 is four, which can achieve a good balance between the manufacturing cost and processing difficulty of the nozzle cores 25 and the needle valve system and the actual effect of the nozzle.

[0026] Since the inner diameter of the diversion channel 22 is smaller than the inner diameter of the sub-material cavity 23, a transition zone 221 is provided between the diversion channel 22 and the sub-material cavity 23; the transition zone 221 is a spherical surface with the opening facing downward.

[0027] Optionally, a sliding sleeve 241 is provided at the upper end of the valve needle channel 24; the sub-valve needle 33 passes through the sliding sleeve 241 and enters the valve needle channel 24; the two ends of the sliding sleeve 241 are respectively embedded in the nozzle body 2 and the flow divider 1, which can play the roles of sealing, guiding the sub-valve needle 33 and assisting in the connection between the nozzle body 2 and the flow divider 1.

[0028] In practical applications, a nozzle heater 111 is provided on the surface of the main nozzle 11; a nozzle heater 26 is provided on the surface of the nozzle body 2; heating tubes 12 are provided on both sides of the flow divider 1; and a ceramic connector 121 is provided at the end of the heating tube 12.

[0029] In this embodiment, the nozzle heater 26 includes an upper section 261, a middle section 262, and a lower section 263. In the upper section 261 and the lower section 263, the nozzle heater 26 is coiled more densely than the middle section 262 to ensure that the temperature difference between the upper and lower ends is as consistent as possible when the molten plastic flows from top to bottom in the nozzle.

[0030] In practical applications, a pad 34 is provided between the needle valve system and the flow divider 1, which can serve as a positioning and heat insulation to prevent heat loss from the flow divider 1, which would lead to uneven temperature inside the flow divider 1 and excessive temperature of the needle valve system; a positioning plate 35 is provided on the top of the drive valve 31 to facilitate the fixed installation of the drive valve 31; in this embodiment, the drive valve 31 is an air valve.

[0031] In practical applications, the nozzle core 25 is fixedly connected to the nozzle body 2 via the connecting flange 251, which facilitates maintenance.

[0032] In this embodiment, the angle between the diversion channel 22 and the vertical direction is preferably 15°.

[0033] Advantages of this utility model:

[0034] The drive valve drives the piston, which in turn drives the sub-valve needle to move up and down simultaneously within the nozzle body. This enables the synchronous opening or closing of multiple nozzle cores and the synchronous adjustment of the flow rate of molten plastic in multiple nozzle cores. It is suitable for injection molding of products with small-pitch multi-cavity molds, small gate spacing, and multiple gates. In addition, the needle valve system with a specific structure can control multiple nozzle cores simultaneously, which can effectively reduce waste, improve product quality, and enhance consistency. Compared with traditional needle valve hot runners, the nozzle gate of this application can be made smaller, allowing for a more compact and flexible product arrangement, reducing mold space, and lowering mold manufacturing costs.

[0035] 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 needle valve type multi-nozzle, comprising a flow divider (1), a nozzle body (2), and a needle valve system, wherein a main nozzle (11) is disposed on one side of the flow divider (1), and the other side is connected to a plurality of nozzle bodies (2), each nozzle body (2) corresponding to a set of needle valve systems, characterized in that, The nozzle body (2) includes an injection port (21); the injection port (21) extends obliquely downward to form several diversion channels (22); each diversion channel (22) is connected to a sub-material chamber (23) below; each sub-material chamber (23) is provided with a valve needle channel (24) above and connected to a nozzle core (25) below; the needle valve system includes a drive valve (31), a piston (32) and several sub-valve needles (33); the piston (32) is connected to the drive valve (31); the upper end of the sub-valve needle (33) is connected to the piston (32), and its lower part passes through the valve needle channel (24), the sub-material chamber (23) and then through the nozzle core (25); the angle between the diversion channel (22) and the vertical direction is between 10° and 20°; the diversion channels (22) are evenly distributed around the center of the injection port (21).

2. The needle valve type multi-head nozzle according to claim 1, characterized in that, The number of nozzle cores (25) on each of the nozzle bodies (2) is four.

3. The needle valve type multi-head nozzle according to claim 1, characterized in that, A transition zone (221) is provided between the diversion channel (22) and the sub-material chamber (23).

4. The needle valve type multi-head nozzle according to claim 1, characterized in that, The upper end of the valve needle channel (24) is provided with a sliding sleeve (241); the sub-valve needle (33) passes through the sliding sleeve (241) and enters the valve needle channel (24).

5. The needle valve type multi-head nozzle according to claim 1, characterized in that, The main nozzle (11) is provided with a nozzle heater (111) on its surface; the nozzle body (2) is provided with a nozzle heater (26) on its surface; the flow divider (1) is provided with heating tubes (12) on both sides; and the end of the heating tube (12) is provided with a ceramic connector (121).

6. The needle valve type multi-head nozzle according to claim 5, characterized in that, The nozzle heater (26) includes an upper section (261), a middle section (262), and a lower section (263).

7. The needle valve type multi-head nozzle according to claim 1, characterized in that, A pad (34) is provided between the needle valve system and the flow divider (1); a positioning plate (35) is provided on the top of the drive valve (31).

8. The needle valve type multi-head nozzle according to claim 1, characterized in that, The nozzle core (25) is fixedly connected to the nozzle body (2) via a connecting flange (251).

9. The needle valve type multi-head nozzle according to claim 1, characterized in that, The angle between the diversion channel (22) and the vertical direction is 15°.

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