Needle valve hot nozzle structure

Abstract

The utility model relates to a needle valve hot nozzle structure which comprises a hot nozzle body, a heater surrounding the periphery of the hot nozzle body and a nozzle core embedded in the hot nozzle body in the height direction, the nozzle core is provided with a runner and a pouring gate communicated with the runner, the end face of the pouring gate is flush with the end face of the hot nozzle body, and a valve needle is arranged in the runner. At least one backflow groove is formed in the end, close to the sprue, of the valve needle, the valve needle can move in the height direction of the nozzle core to open or close the sprue, when the valve needle opens the sprue, molten materials flow to the sprue through the runner and flow out of the hot nozzle body, and when the valve needle closes the sprue, the valve needle is in clearance fit with the tail end of the nozzle core. And the molten material located at the pouring gate flows back to the runner through the backflow groove. According to the hot nozzle, the backflow groove is formed in the valve needle, molten materials are prevented from being solidified at the sprue and influencing the subsequent injection molding process, and meanwhile, the heater is arranged on the periphery of the hot nozzle body, so that the molten materials are always kept in a molten state in the runner.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field, specifically, relate to a needle valve hot nozzle structure. BACKGROUND

[0002] In the injection molding process, the molten material is pushed into the mold under the high pressure of the injection molding machine. The gate, as a channel connecting the injection molding machine and the mold, has a relatively small size, which leads to the accumulation of molten material when passing through the gate. When the injection molding process is completed, the valve needle will quickly close the gate to prevent the molten material from continuing to flow into the mold. At this time, the molten material at the gate loses the pressure push of the injection molding machine and is in a relatively static state, and because its temperature is still high, it is easy to start to solidify in a short time. Once the material at the gate solidifies, a hard blockage is formed. This blockage will hinder the flow of molten material in the subsequent injection molding process, resulting in defects or scrap of the injection molded product. SUMMARY

[0003] The utility model discloses a needle valve hot nozzle structure, by setting backflow groove in the valve needle, when the gate is closed, the molten material remaining at the gate can flow back to the flow channel through the backflow groove, avoiding the solidification of the molten material at the gate, affecting the subsequent injection molding process, and at the same time, a heater is arranged on the outer periphery of the hot nozzle body, ensuring that the molten material always remains in a molten state in the flow channel.

[0004] A needle valve hot nozzle structure, comprising a hot nozzle body, a heater surrounding the outer periphery of the hot nozzle body, and a nozzle core embedded in the hot nozzle body along the height direction, the nozzle core having a flow channel and a gate communicating with the flow channel, the end face of the gate being flush with the end face of the hot nozzle body, a valve needle being provided in the flow channel, at least one backflow groove being provided on the end of the valve needle close to the gate, the valve needle being movable along the height direction of the nozzle core to open or close the gate, when the valve needle opens the gate, the molten material flows through the flow channel to the gate and out of the hot nozzle body, when the valve needle closes the gate, the valve needle and the end of the nozzle core are in clearance fit, and the molten material at the gate flows back to the flow channel through the backflow groove.

[0005] In the above technical solution, the heater is arranged around the outer periphery of the hot nozzle body to heat and maintain the temperature of the hot nozzle body and the inner flow channel of the nozzle core, so as to ensure that the molten material always remains in a molten state during the flow process. The nozzle core is embedded in the hot nozzle body and has a flow channel and a sprue connected to the flow channel. The flow channel is used to guide the flow direction of the molten material, and the sprue is the outlet of the molten material flowing out of the hot nozzle body. The valve needle is arranged in the flow channel and can move along the height direction of the nozzle core to open or close the sprue. The backflow groove is arranged at one end of the valve needle close to the sprue, and when the valve needle closes the sprue, the molten material located at the sprue can flow back to the flow channel through the backflow groove, thereby avoiding the formation of solidified blockage at the sprue. The utility model discloses a backflow groove arranged on the valve needle, so that when the sprue is closed, the molten material remaining at the sprue can flow back to the flow channel through the backflow groove, avoiding the solidification of the molten material at the sprue, affecting the subsequent injection molding process, and at the same time, the heater is arranged on the outer periphery of the hot nozzle body, ensuring that the molten material always remains in a molten state in the flow channel.

[0006] Further, the heater is arranged at one end of the hot nozzle body close to the sprue.

[0007] In the above technical solution, the heater is arranged close to the sprue, which can ensure that the sprue and the molten material around it maintain a proper temperature. This helps to prevent the material from solidifying too early at the sprue, thereby improving the stability of the injection molding process and the quality of the product.

[0008] Further, the nozzle core is provided with a first vertical portion at one end close to the sprue, and the valve needle is provided with a second vertical portion corresponding to the first vertical portion, and when the valve needle closes the sprue, the gap between the first vertical portion and the second vertical portion is 0.05mm.

[0009] In the above technical solution, when the valve needle is closed, this small gap allows the molten material located at the sprue to flow back to the flow channel through the backflow groove, which helps to reduce the accumulation and solidification of the material at the sprue, thereby improving the stability of the injection molding process and the quality of the product.

[0010] Further, when the valve needle closes the sprue, at least part of the valve needle protrudes out of the sprue.

[0011] In the above technical solution, the design of the valve needle partially protruding out of the sprue can ensure that when closed, the valve needle can tightly fit the edge of the sprue, thereby effectively preventing the leakage of molten material.

[0012] Further, the backflow groove extends along the height direction of the valve needle.

[0013] In the technical scheme, the extension of the backflow groove along the height direction of the valve needle provides a smoother and more direct backflow path for the molten material, which helps to reduce the accumulation and solidification of the material near the gate, thereby improving the continuity and stability of the injection molding process.

[0014] Further, the hot nozzle body is provided with a gate controller, and the gate controller is sleeved on the end of the nozzle core close to the gate.

[0015] In the technical scheme, the main function of the gate controller is to package the nozzle core in the hot nozzle body, so as to ensure that the nozzle core maintains a stable position and shape during the injection molding process, thereby preventing the nozzle core from being deformed or displaced due to high temperature or high pressure.

[0016] Further, the material of the gate controller is high-carbon high-chromium alloy tool steel.

[0017] In the technical scheme, the high-carbon high-chromium alloy tool steel can still maintain stable hardness and mechanical properties at high temperatures, which enables the gate controller to withstand the impact and heat of the high-temperature molten material during the injection molding process without being easily deformed or damaged.

[0018] Further, the hot nozzle body is provided with a gate controller, and the gate controller is sleeved on the end of the nozzle core close to the gate.

[0019] In the technical scheme, the insert provides a precise positioning and supporting point for the hot nozzle body, so as to ensure that the hot nozzle body maintains a stable position and shape during the injection molding process, thereby preventing the hot nozzle body from being deformed or displaced due to high temperature or high pressure.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows: a backflow groove is arranged at the end of the valve needle close to the gate,

[0021] When the valve needle closes the gate, the molten material remaining in the gate flows back to the flow channel through the backflow groove, avoiding the formation of solidified blocking materials in the gate. At the same time, the heater is arranged around the hot nozzle body, so as to ensure that the molten material can still maintain a molten state when flowing in the flow channel. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view when the gate of the utility model embodiment is opened.

[0023] Figure 2 It is a structure schematic view when the gate of the utility model embodiment is closed.

[0024] Figure 3 It is Figure 2 It is an enlarged schematic view of A.

[0025] EXPLANATION OF REFERENCE NUMBERS

[0026] 1. a hot nozzle body;

[0027] 2. a heater;

[0028] 3. a nozzle core; 301. a flow channel; 302. a gate; 303. a first vertical part;

[0029] 4. a valve needle; 401. a backflow groove; 402. a second vertical part;

[0030] 5. a gap; 6. a gate controller; 7. an insert. DETAILED DESCRIPTION

[0031] The needle valve hot nozzle structure of the present application will be further described in detail below in conjunction with specific embodiments and the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein.

[0032] Please refer to Figure 1 and Figure 2 In a preferred embodiment, the needle valve hot nozzle structure of the present application comprises a hot nozzle body 1, a heater 2 surrounding the outer periphery of the hot nozzle body 1, and a nozzle core 3 embedded in the hot nozzle body 1 along the height direction, the nozzle core 3 having a flow channel 301 and a gate 302 connected with the flow channel 301, the end face of the gate 302 being flush with the end face of the hot nozzle body 1, the flow channel 301 being provided with a valve needle 4, the valve needle 4 being provided with at least one backflow groove 401 at the end close to the gate 302, the valve needle 4 being movable along the height direction of the nozzle core 3 to open or close the gate 302, when the valve needle 4 opens the gate 302, the molten material flows through the flow channel 301 to the gate 302 and out of the hot nozzle body 1, when the valve needle 4 closes the gate 302, the valve needle 4 is in gap fit with the end of the nozzle core 3, and the molten material at the gate 302 is backflowed to the flow channel 301 through the backflow groove 401.

[0033] The structure in practical application, heater 2 surrounds the hot nozzle body 1 outer periphery, for heating and keeping the temperature of hot nozzle body 1 and nozzle core 3 inner flow channel 301, to ensure that the molten material always keeps molten state in the flowing process. Nozzle core 3 is embedded in hot nozzle body 1, with flow channel 301 and nozzle gate 302 connected with flow channel 301. Flow channel 301 is used to guide the flowing direction of molten material, and nozzle gate 302 is the outlet of molten material flowing out of hot nozzle body 1. Valve needle 4 is arranged in flow channel 301, and can move along the height direction of nozzle core 3 to open or close nozzle gate 302. Backflow groove 401 is arranged at one end of valve needle 4 close to nozzle gate 302, when valve needle 4 closes nozzle gate 302, the molten material located at nozzle gate 302 can flow back to flow channel 301 through backflow groove 401, so as to avoid forming solidified blockage at nozzle gate 302. The utility model discloses a backflow groove 401 is arranged on valve needle 4, so that when nozzle gate 302 is closed, the molten material remaining at nozzle gate 302 can flow back to flow channel 301 through backflow groove 401, avoid the solidification of molten material at nozzle gate 302, affect the subsequent injection molding process, and heater 2 is arranged on the outer periphery of the outer periphery of hot nozzle body 1, to ensure that the molten material always keeps molten state in flow channel 301.

[0034] Specifically, when the injection molding machine starts working, the molten material is pushed into the flow channel 301 in the nozzle core 3 by high pressure. At this time, the valve needle 4 is in the open state, allowing the molten material to flow through the flow channel 301 to the nozzle gate 302 and flow out of the hot nozzle body 1 into the mold cavity. The molten material cools and solidifies in the mold cavity to form a plastic product. When the injection molding process is completed, the valve needle 4 quickly closes the nozzle gate 302 to prevent the molten material from continuing to flow into the mold. At this time, the molten material located at the nozzle gate 302 loses the pressure pushing of the injection molding machine and is in a relatively static state, and at the same time, due to its high temperature, it is easy to start solidification in a short time. However, due to the backflow groove 401 arranged on the valve needle 4, these molten materials about to solidify can flow back to the flow channel 301 through the backflow groove 401, thereby avoiding the formation of solidified blockage at the nozzle gate 302. In the next injection molding process, the valve needle 4 opens the nozzle gate 302 again, allowing new molten material to flow out of the hot nozzle body 1 through the flow channel 301 and the nozzle gate 302 into the mold cavity. This cycle is repeated to achieve continuous injection molding production.

[0035] It should be noted that in this embodiment, the heater 2 is arranged at one end of the hot nozzle body 1 close to the gate 302. By arranging the heater 2 close to the gate 302, the molten material around the gate 302 can be kept at an appropriate temperature, which helps to prevent the material from prematurely solidifying at the gate, thereby improving the stability of the injection molding process and the quality of the product. Since the temperature around the gate 302 is kept appropriate, the molten material can flow more smoothly through the gate 302 into the mold cavity, which helps to reduce the injection molding cycle time and improve production efficiency. Specifically, the outer periphery of the hot nozzle body 1 is provided with a mounting groove accommodating the heater 2, and the heater 2 is wound around the hot nozzle body 1 through the mounting groove.

[0036] Please refer to Figure 1 and Figure 3 , one end of the nozzle core 3 close to the gate 302 is provided with a first vertical part 303, and the valve needle 4 is provided with a second vertical part 402 corresponding to the first vertical part 303. When the valve needle 4 closes the gate 302, the gap 5 between the first vertical part 303 and the second vertical part 402 is 0.05mm. When the valve needle 4 is closed, this small gap 5 allows the molten material located at the gate 302 to flow back into the runner 301 through the backflow groove 401, which helps to reduce the accumulation and solidification of the material at the gate 302, thereby improving the stability of the injection molding process and the quality of the product.

[0037] It should be noted that in this embodiment, at least part of the valve needle 4 protrudes out of the gate 302 when the valve needle 4 closes the gate 302. The design of the valve needle 4 partially protruding out of the gate 302 can ensure that the valve needle 4 can tightly fit the edge of the gate 302 when the gate 302 is closed, thereby effectively preventing the leakage of molten material.

[0038] Please refer to Figure 3 , the backflow groove 401 extends along the height direction of the valve needle 4. The extension of the backflow groove 401 along the height direction of the valve needle 4 provides a smoother and more direct backflow path for the molten material, which helps to reduce the accumulation and solidification of the material around the gate 302, thereby improving the continuity and stability of the injection molding process. Since the extension direction of the backflow groove 401 is consistent with the height direction of the valve needle 4, the molten material can flow more easily along the groove during the backflow process, reducing the flow resistance and energy loss, which helps to improve the backflow efficiency and ensure that more molten material can flow back into the runner 301 smoothly.

[0039] Further, in this embodiment, the hot nozzle body 1 is provided with a gate controller 6, and the gate controller 6 is sleeved on one end of the nozzle core 3 close to the gate 302. The main function of the gate controller 6 is to encapsulate the nozzle core 3 in the hot nozzle body 1, which helps to prevent the nozzle core 3 from deforming or shifting due to high temperature or high pressure during the injection molding process.

[0040] It should be noted that in the present embodiment, the material of the sprue bush 6 is high-carbon high-chromium alloy tool steel. The high-carbon high-chromium alloy tool steel can maintain stable hardness and mechanical properties at high temperatures, which enables the sprue bush 6 to withstand the impact and heat of the molten material at high temperatures during the injection molding process without being easily deformed or damaged.

[0041] Further, the utility model still includes insert piece 7, hot nozzle body 1 is close to one end of sprue bush 6 and is arranged in insert piece 7. Insert piece 7 provides a precise positioning and support point for hot nozzle body 1, ensures that hot nozzle body 1 can keep stable position and form during the injection molding process, prevents deformation or displacement due to high temperature or high pressure.

[0042] In the present embodiment, the insert piece 7 is made of beryllium copper, which has better electrical conductivity and thermal conductivity than many other copper alloys, and is suitable for applications that require efficient heat and electrical conduction.

[0043] In the description of the utility model, it should be understood that the terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0044] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0045] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0046] Although the description of the utility model is combined with above specific embodiment, but, personnel familiar with this technical field can carry out many substitutions, modification and change according to the above content, it is obvious. Therefore, all such alternatives, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A needle valve hot tip structure comprising a hot tip body, a heater surrounding an outer periphery of the hot tip body, and a tip core embedded in the hot tip body in a height direction, characterized by, The nozzle core has a flow channel and a gate communicating with the flow channel, an end surface of the gate is flush with an end surface of the hot nozzle body, a valve needle is arranged in the flow channel, at least one backflow groove is arranged at an end of the valve needle close to the gate, the valve needle is movable along a height direction of the nozzle core to open or close the gate, when the valve needle opens the gate, molten material flows to the gate through the flow channel and out of the hot nozzle body, when the valve needle closes the gate, the valve needle is in clearance fit with an end of the nozzle core, and molten material at the gate is backflowed to the flow channel through the backflow groove.

2. The needle valve hot tip structure of claim 1, wherein The heater is arranged at an end of the hot nozzle body close to the gate.

3. The needle valve hot tip structure of claim 1, wherein The nozzle core has a first vertical part at an end close to the gate, the valve needle has a second vertical part corresponding to the first vertical part, and a clearance between the first vertical part and the second vertical part is 0.05 mm when the valve needle closes the gate.

4. The needle valve hot tip structure of claim 1, wherein At least part of the valve needle extends out of the gate when the valve needle closes the gate.

5. The needle valve hot tip structure of claim 1, wherein The backflow groove extends along a height direction of the valve needle.

6. The needle valve hot tip structure of claim 1, wherein The hot nozzle body is provided with a gate controller, and the gate controller is sleeved at an end of the nozzle core close to the gate.

7. The needle valve hot tip structure of claim 6, wherein The gate controller is made of high-carbon high-chromium alloy tool steel.

8. The needle valve hot tip structure of claim 6, wherein, The hot nozzle body further comprises an insert, and an end of the hot nozzle body close to the gate controller is arranged in the insert.

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