An in-line valve needle and hot tip structure
By setting an inlay groove at the end of the valve needle gate and embedding a metal insert into the inlaid valve needle structure, the problems of needle sticking and burrs caused by high temperature at the gate are solved, improving the product's aesthetics and the wear resistance of the valve needle.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG YUDO HOT RUNNER SYST
- Filing Date
- 2025-06-26
- Publication Date
- 2026-06-09
AI Technical Summary
The traditional one-piece valve needle structure results in high temperatures at the gate, which can easily cause problems such as needle sticking and burrs, affecting the product's appearance.
An embedded valve needle structure is adopted, with an inlay groove set at the end of the valve needle gate, and a low or high thermal conductivity metal insert is embedded in the inlay groove. The metal insert is flush with the gate end face of the valve needle body and is fixed by welding.
It improves heat accumulation at the gate, avoids sticking and burrs at the gate after product demolding, enhances the appearance of plastic products, and ensures the wear resistance of the valve needle.
Smart Images
Figure CN224334908U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of hot runners, and more specifically, to an embedded valve needle and hot nozzle structure. Background Technology
[0002] In a hot runner system, the valve needle is a crucial component for closing the gate. Traditional valve needles are integrally molded, with the head and tail made of identical materials, resulting in uniform thermal conductivity. During operation within the hot runner system, the valve needle engages with the hot nozzle head, guiding a large amount of plastic into the mold cavity through the gate. During this process, heat from the hot nozzle is conducted to the valve needle head, causing shear heat at the gate. When the valve needle closes the gate after injection molding, the accumulated shear heat makes the gate temperature higher than other parts of the cavity. Since the solidification of plastic is affected by temperature, this high gate temperature can easily cause problems such as needle sticking and flash, ultimately affecting the product's appearance. Utility Model Content
[0003] The purpose of this invention is to provide an embedded valve needle and hot nozzle structure to solve the technical problem that the integral valve needle structure in the prior art causes high temperature at the gate, which easily leads to needle sticking and burrs.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] On the one hand, this utility model provides an embedded valve needle, including a valve needle body and a metal insert. The valve needle body has an inlay groove at the gate end. The metal insert is embedded in the inlay groove and fixed in the inlay groove. The end face of the metal insert near the gate end of the valve needle body is flush with the end face of the gate end of the valve needle body.
[0006] According to the above-described embedded valve needle, the metal insert is disposed in the inlay groove and fixed by welding.
[0007] According to the aforementioned embedded valve needle, the embedded end edge of the metal insert is chamfered.
[0008] According to the above-described embedded valve needle, both the inlay groove and the cross-sectional shape of the metal insert are circular.
[0009] According to the above-described embedded valve needle, the diameter of the metal insert is 0.5mm to 5mm, and the depth of the inlay groove is 1.5 times the diameter of the metal insert.
[0010] According to the above-described embedded valve needle, the metal insert is a low thermal conductivity metal insert;
[0011] Alternatively, the metal insert may be a metal insert with high thermal conductivity.
[0012] On the other hand, this utility model also provides a hot nozzle structure, including the above-mentioned embedded valve needle;
[0013] The hot nozzle structure also includes a hot nozzle body and a nozzle core. The hot nozzle body has a first flow channel, and the nozzle core has a second flow channel. The nozzle core is located at one end of the hot nozzle body and connected to the hot nozzle body. The first flow channel and the second flow channel are connected and communicate with each other. The valve needle passes through the first flow channel and the second flow channel in sequence and exits to the end of the nozzle core's gate.
[0014] According to the hot nozzle structure described above, the hot nozzle structure further includes a heater, which is arranged around the outside of the hot nozzle body and connected to the hot nozzle body.
[0015] According to the hot nozzle structure described above, the hot nozzle structure further includes a pressure cap, which is sleeved on the outside of the nozzle core and located inside the hot nozzle body. The pressure cap is connected to both the nozzle core and the hot nozzle body.
[0016] According to the hot nozzle structure described above, the hot nozzle structure further includes a color-changing cap, which is disposed at the gate end of the nozzle core and sleeved on the outside of the nozzle core. The color-changing cap is connected to both the nozzle core and the pressure cap, and the end of the color-changing cap protrudes from the gate end of the nozzle core.
[0017] The beneficial effects of the embedded valve needle and hot nozzle structure provided by this utility model are at least as follows:
[0018] This utility model provides an embedded valve needle and hot runner structure. The valve needle has a simple overall structure, with an inlay groove at the gate end and a metal insert placed within it. The metal insert improves heat accumulation at the gate, preventing adhesion and burrs at the gate after product demolding, thus enhancing the aesthetics of the plastic product's gate. During actual operation, the valve needle reciprocates, meaning the gate end of the valve needle reciprocates in conjunction with the mold gate. The metal insert is embedded in the inlay groove of the hot runner body, with the gate end face of the metal insert flush with the gate end face of the valve needle body, ensuring the valve needle's wear resistance. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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.
[0020] Figure 1 A schematic diagram of the embedded valve needle provided for the utility model;
[0021] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle;
[0022] Figure 3 A three-dimensional structural diagram of the heating nozzle structure provided for the utility model;
[0023] Figure 4 A cross-sectional structural diagram of the hot nozzle structure provided for the utility model.
[0024] The following are the labeling elements in the figure:
[0025] 100. Hot nozzle structure; 10. Valve needle; 11. Valve needle body; 111. Insert slot; 112. Rounded corner; 12. Metal insert; 121. Chamfer; 20. Hot nozzle body; 21. First flow channel; 30. Nozzle core; 31. Second flow channel; 40. Heater; 50. Pressure cap; 60. Color change cap. Detailed Implementation
[0026] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0027] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality of" means two or more, unless otherwise explicitly defined.
[0028] Please see Figure 1 and Figure 2This embodiment provides an embedded valve needle 10, including a valve needle body 11 and a metal insert 12. The valve needle body 11 has an inlay groove 111 at the gate end. The metal insert 12 is embedded in and fixed in the inlay groove 111, and one end face of the metal insert 12 near the gate end of the valve needle body 11 is flush with the end face of the gate end of the valve needle body 11.
[0029] The beneficial effects of the embedded valve needle 10 provided in this embodiment are as follows:
[0030] The embedded valve needle 10 provided in this embodiment has a simple overall structure. An inlay groove 111 is provided at the gate end of the valve needle 10, and a metal insert 12 is placed within the inlay groove 111. The metal insert 12 improves heat accumulation at the gate, thereby preventing adhesion and burrs at the gate after product demolding, and improving the aesthetics of the plastic product's gate. During actual operation, the valve needle 10 needs to reciprocate, that is, the gate end of the valve needle 10 reciprocates in conjunction with the mold gate. The metal insert 12 is embedded in the inlay groove 111 of the hot runner body 20, and the gate end face of the metal insert 12 is flush with the gate end face of the valve needle body 11, ensuring the wear resistance of the valve needle 10.
[0031] In one embodiment, the metal insert 12 is disposed within the inlay slot 111 and fixed by welding.
[0032] Optionally, flux is injected into the inlay slot 111, and after the metal insert 12 is embedded in the inlay slot 111, high-frequency welding is used to weld the metal insert 12 and the inlay slot 111 together.
[0033] In one embodiment, see Figure 2 The inner edge of the metal insert 12 is chamfered 121. The chamfer 121 has a guiding function, and the chamfer 121 on the metal insert 12 facilitates the quick and accurate insertion of the metal insert 12 into the inlay slot 111.
[0034] Optionally, chamfer 121 is a 45° chamfer 121. It should be understood that chamfer 121 is not limited to a 45° chamfer 121, and can also be a chamfer 121 at other angles, which is not restricted here.
[0035] In one embodiment, see Figure 2 The valve needle body 11 has a rounded corner 112 at the end edge of the gate. The rounded corner 112 can prevent the valve needle 10 from being damaged by impact.
[0036] In one embodiment, both the inlay slot 111 and the metal insert 12 have circular cross-sectional shapes. This circular shape facilitates adaptation to the circular cross-sectional shape of the valve needle 10 and also allows the metal insert 12 to be embedded within the inlay slot 111. It should be understood that the cross-sectional shapes of the inlay slot 111 and the metal insert 12 are not limited to the circular shapes described above; other shapes are also possible and are not limited here.
[0037] In one embodiment, the diameter of the metal insert 12 is 0.5 mm to 5 mm, and the depth of the inlay slot 111 is 1.5 times the diameter of the metal insert 12.
[0038] In one embodiment, the diameter of the metal insert 12 is 0.5 mm, and the depth of the inlay slot 111 is 0.75 mm.
[0039] In one embodiment, the diameter of the metal insert 12 is 4 mm and the depth of the inlay slot 111 is 6 mm.
[0040] In one embodiment, the diameter of the metal insert 12 is 5 mm, and the depth of the inlay slot 111 is 7.5 mm.
[0041] It should be understood that the diameter of the metal insert 12 and the depth of the inlay slot 111 are not limited to the above-described cases, but may be other cases, which are not limited here.
[0042] In one embodiment, the metal insert 12 is a low thermal conductivity metal insert. When the metal insert 12 is made of a low thermal conductivity material, such as titanium alloy TC4, the low thermal conductivity of titanium alloy TC4 prevents the shear heat accumulated at the gate from being conducted to the gate through the valve needle 10, thus achieving rapid solidification of the gate and avoiding problems such as glue adhesion and burrs, further improving the aesthetics of the gate of the plastic product.
[0043] In another embodiment, the metal insert 12 is a metal insert with high thermal conductivity. When the metal insert 12 is made of a material with high thermal conductivity, such as a beryllium copper rod (Be-Cu rod), which is a product made of copper (Cu) and beryllium (Be), a reverse effect is achieved, namely, enhancing the gate temperature, thereby enabling its application in liquid silicone injection molding environments.
[0044] Please see Figure 3 and Figure 4This embodiment also provides a hot nozzle structure 100, including the aforementioned embedded valve needle 10. The hot nozzle structure 100 further includes a hot nozzle body 20 and a nozzle core 30. The hot nozzle body 20 has a first flow channel 21, and the nozzle core 30 has a second flow channel 31. The nozzle core 30 is disposed at one end of the hot nozzle body 20 and connected to it. The first flow channel 21 and the second flow channel 31 are connected and communicate with each other. The valve needle 10 passes sequentially through the first flow channel 21 and the second flow channel 31 and exits to the gate end of the nozzle core 30. Since the valve needle 10 has been described in detail above, it will not be repeated here. The valve needle 10 passes sequentially through the first flow channel 21 and the second flow channel 31 and exits to the gate end of the nozzle core 30, so that when the valve needle 10 reciprocates, a large amount of plastic is injected into the mold cavity through the gate.
[0045] In one embodiment, see Figure 4 The hot nozzle structure 100 further includes a heater 40, which is arranged around the outside of the hot nozzle body 20 and connected to the hot nozzle body 20. The heater 40 is used to heat the plastic in the first flow channel 21 and the second flow channel 31.
[0046] Optionally, the heater 40 is connected to the heating nozzle body 20 by screws. It should be understood that the connection method between the heater 40 and the heating nozzle body 20 is not limited to the screw connection method described above, and other connection methods are also possible, which are not limited here.
[0047] In one embodiment, see Figure 4 The hot nozzle structure 100 also includes a pressure cap 50, which is sleeved on the outside of the nozzle core 30 and located inside the hot nozzle body 20. The pressure cap 50 is connected to both the nozzle core 30 and the hot nozzle body 20. The function of the pressure cap 50 is to seal the nozzle core 30, prevent molten plastic leakage, and ensure stable operation of the system.
[0048] In one embodiment, see Figure 4 The hot runner structure 100 also includes a color-changing cap 60. The color-changing cap 60 is located at the gate end of the runner core 30 and sleeved on the outside of the runner core 30. The color-changing cap 60 is connected to both the runner core 30 and the pressure cap 50. The end of the color-changing cap 60 protrudes beyond the gate end of the runner core 30. Color changes are necessary because different colors are required for the product. The color-changing cap 60, with its end protruding beyond the gate end of the runner core 30, prevents residual plastic from clogging the runner core 30 and the valve pin 10. The presence of the color-changing cap 60 eliminates gaps in this area, preventing residue and enabling rapid color changes. Furthermore, the color-changing cap 60 is made of high-temperature resistant polyimide, which can insulate the heat from the hot runner from being transferred to the mold core gate.
[0049] In summary, this embodiment provides an embedded valve needle 10, including a valve needle body 11 and a metal insert 12. The valve needle body 11 has an inlay groove 111 at its gate end. The metal insert 12 is embedded in and fixed within the inlay groove 111, and one end face of the metal insert 12 near the gate end of the valve needle body 11 is flush with the gate end face of the valve needle body 11. This embodiment also provides a hot runner structure 100, including the aforementioned valve needle 10. The hot nozzle structure 100 further includes a hot nozzle body 20 and a nozzle core 30. The hot nozzle body 20 has a first flow channel 21, and the nozzle core 30 has a second flow channel 31. The nozzle core 30 is disposed at one end of the hot nozzle body 20 and connected to it. The first flow channel 21 and the second flow channel 31 are connected and communicate with each other. The valve needle 10 passes through the first flow channel 21 and the second flow channel 31 in sequence and exits to the gate end of the nozzle core 30. The embedded valve needle 10 and the hot nozzle structure 100 provided in this embodiment have a simple overall structure. An inlay groove 111 is provided at the gate end of the valve needle 10, and a metal insert 12 is provided in the inlay groove 111. The metal insert 12 can improve the heat accumulation at the gate, thereby avoiding the phenomenon of adhesion and burrs at the gate of the product after demolding, and improving the aesthetics of the gate of the plastic product. In actual operation, the valve needle 10 needs to reciprocate, that is, the end of the valve needle 10 gate reciprocates with the mold gate, and the metal insert 12 is embedded in the insert groove 111 of the hot nozzle body 20, and the gate end face of the metal insert 12 is flush with the gate end face of the valve needle body 11, which ensures the wear resistance of the valve needle 10.
[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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. An embedded valve needle, characterized in that, The device includes a valve needle body and a metal insert. The valve needle body has an inlay groove at the gate end. The metal insert is embedded in and fixed in the inlay groove, and one end face of the metal insert near the gate end of the valve needle body is flush with the end face of the gate end of the valve needle body.
2. The embedded valve needle according to claim 1, characterized in that, The metal insert is disposed within the inlay slot and fixed by welding.
3. The embedded valve needle according to claim 1, characterized in that, The inner edge of the metal insert is chamfered.
4. The embedded valve needle according to claim 1, characterized in that, Both the inlay slot and the cross-sectional shape of the metal insert are circular.
5. The embedded valve needle according to claim 4, characterized in that, The diameter of the metal insert is 0.5mm to 5mm, and the depth of the inlay groove is 1.5 times the diameter of the metal insert.
6. The embedded valve needle according to claim 1, characterized in that, The metal insert is a low thermal conductivity metal insert; Alternatively, the metal insert may be a metal insert with high thermal conductivity.
7. A heating nozzle structure, characterized in that, Including the embedded valve needle as described in any one of claims 1 to 6; The hot nozzle structure also includes a hot nozzle body and a nozzle core. The hot nozzle body has a first flow channel, and the nozzle core has a second flow channel. The nozzle core is located at one end of the hot nozzle body and connected to the hot nozzle body. The first flow channel and the second flow channel are connected and communicate with each other. The valve needle passes through the first flow channel and the second flow channel in sequence and exits to the end of the nozzle core's gate.
8. The heating nozzle structure according to claim 7, characterized in that, The hot nozzle structure also includes a heater, which is arranged around the outside of the hot nozzle body and connected to the hot nozzle body.
9. The heating nozzle structure according to claim 7, characterized in that, The hot nozzle structure also includes a pressure cap, which is sleeved on the outside of the nozzle core and located inside the hot nozzle body. The pressure cap is connected to both the nozzle core and the hot nozzle body.
10. The heating nozzle structure according to claim 9, characterized in that, The hot nozzle structure also includes a color-changing cap, which is located at the gate end of the nozzle core and sleeved on the outside of the nozzle core. The color-changing cap is connected to both the nozzle core and the pressure cap, and the end of the color-changing cap protrudes from the gate end of the nozzle core.