A valve needle structure, a hot nozzle structure and a hot runner system

Abstract

The present application relates to hot runner technical field, provide a valve needle structure, hot nozzle structure and hot runner system, wherein, the valve needle structure includes: valve needle body, the cavity is equipped in valve needle body;Heating rod, heating rod is equipped in the cavity, and the heat is transmitted to valve needle body.The valve needle structure, hot nozzle structure and hot runner system provided by the present application, the cavity is arranged in the valve needle body, and the heating rod is placed in the cavity, the heat generated by the heating rod is transmitted to the valve needle body, the temperature of the valve needle body is improved, the valve needle body transmits the heat to the plastic inside the hot nozzle structure, so that when the plastic is injected, even in the cooling pressure holding time, the valve needle head can seal the gate, completely avoid the situation that the valve needle retreats, improve the yield of injection molding products, and the valve needle structure is simple in structure, convenient to manufacture, and low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to hot runner technology field, more particularly, it is related to a valve needle structure, hot nozzle structure and hot runner system. BACKGROUND

[0002] Hot runner is through the method of heating to ensure that the runner and the plastic of the gate keep molten state, in the hot runner, when injection molding plastic, plastic requires high temperature, its valve needle head is affected by the mold cooling water, takes away part of the heat, causes the temperature of the valve needle head to drop too fast, the plastic solidification, in turn, causes the valve needle to fail to seal the gate, needle sealing is poor. SUMMARY

[0003] The purpose of the present application is to provide a valve needle structure, hot nozzle structure and hot runner system, to solve the technical problem that the temperature of the valve needle head drops too fast in the prior art, the plastic solidification, in turn, causes the valve needle to fail to seal the gate, needle sealing is poor.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0005] On the one hand, the present application provides a valve needle structure, comprising:

[0006] The valve needle body is provided with a cavity in the valve needle body;

[0007] The heating rod is arranged in the cavity and transmits heat to the valve needle body.

[0008] In one embodiment, the valve needle body comprises a first valve needle segment, a second valve needle segment and a third valve needle segment arranged in sequence, and the first valve needle segment, the second valve needle segment and the third valve needle segment are of an integral structure;

[0009] The second valve needle segment is used to be placed in the hot nozzle runner, and the length of the second valve needle segment corresponds to the length of the hot nozzle heater, the first valve needle segment extends out of the hot nozzle runner and is arranged close to the end of the mold cavity, and the third valve needle segment extends out of the hot nozzle runner and is arranged close to the end of the valve needle hanging table;

[0010] The cavity comprises a first cavity, a second cavity and a third cavity connected in sequence, the first cavity, the second cavity and the third cavity are arranged in the first valve needle segment, the second valve needle segment and the third valve needle segment respectively, and the first cavity extends to the end of the first valve needle segment, and the end of the first valve needle segment is sealed.

[0011] In one embodiment, the heating rod comprises a first segment heating rod, and the first segment heating rod is arranged in the first cavity;

[0012] Or, the heating rod comprises a first heating rod and a second heating rod, and the first heating rod and the second heating rod are in an integrated structure, the first heating rod is arranged in the first cavity, and the second heating rod is arranged in the second cavity.

[0013] Or, the heating rod comprises a first heating rod, a second heating rod and a third heating rod, and the first heating rod, the second heating rod and the third heating rod are in an integrated structure, the first heating rod is arranged in the first cavity, the second heating rod is arranged in the second cavity, and the third heating rod is arranged in the third cavity.

[0014] In one embodiment, a mounting hole is arranged at the top of the valve needle body, the mounting hole is in communication with the cavity, the inner diameter of the mounting hole is larger than the inner diameter of the cavity, so as to form a limiting step, a screw is arranged in the mounting hole, the screw is in threaded connection with the mounting hole and is limited by the limiting step.

[0015] In one embodiment, a first connecting part is arranged at the top of the valve needle body, and the first connecting part is used for cooperating with a valve needle hanging table.

[0016] In one embodiment, a wire outlet hole is arranged at the side of the top of the valve needle body, and the cable of the heating rod is arranged to pass out of the wire outlet hole.

[0017] In one embodiment, the heating rod is in a cylindrical shape.

[0018] Or, the heating rod is in a spiral shape.

[0019] In one embodiment, the diameter of the heating rod is 4mm-10mm.

[0020] In the second aspect, the application further provides a hot nozzle structure comprising the valve needle structure, the hot nozzle structure further comprising a hot nozzle body, a nozzle tip and a hot nozzle heater, the hot nozzle heater being arranged around the periphery of the hot nozzle body, the nozzle tip being arranged below the hot nozzle body and being connected with the hot nozzle body, a hot nozzle flow channel being arranged in the hot nozzle body, and the valve needle structure being arranged in the hot nozzle flow channel and passing out of the nozzle tip.

[0021] In the third aspect, the application further provides a hot runner system comprising the hot nozzle structure, the hot runner system further comprising a valve needle hanging table, a second connecting part being arranged on the valve needle hanging table and being used for connecting with the valve needle structure.

[0022] The valve needle structure, the hot nozzle structure and the hot runner system provided by the application have at least the following beneficial effects:

[0023] The valve needle structure, the hot nozzle structure and the hot runner system have the following advantages: the cavity is arranged in the valve needle body, the heating rod is arranged in the cavity, the heat generated by the heating rod is transmitted to the valve needle body, the temperature of the valve needle body is improved, the valve needle body transmits the heat to the plastic in the hot nozzle structure, the valve needle head can seal the gate when the plastic is injected, the situation that the valve needle retreats is avoided, the yield of the injection product is improved, the valve needle structure is simple in structure, convenient in manufacturing and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0025] Figure 1 The structure schematic view of the valve needle structure and the valve needle hanging table cooperation connection provided by the embodiment of the present application is shown in the figure.

[0026] Figure 2 The structure schematic view of the valve needle structure provided by the embodiment of the present application is shown in the figure.

[0027] Figure 3 The explosion structure schematic view of the valve needle structure and the valve needle hanging table provided by the embodiment of the present application is shown in the figure.

[0028] Figure 4 The structure schematic view of the hot nozzle structure provided by the embodiment of the present application is shown in the figure.

[0029] Figure 5 The structure schematic view of the hot runner system provided by the embodiment of the present application is shown in the figure.

[0030] In the figure, various reference signs are as follows:

[0031] 10000, hot runner system; 1000, hot nozzle structure; 100, valve needle structure; 110, valve needle body; 110a, first valve needle segment; 110b, second valve needle segment; 110c, third valve needle segment; 111, cavity; 1111, first cavity; 1112, second cavity; 1113, third cavity; 112, mounting hole; 113, limiting step; 114, first connecting part; 115, wire outlet hole; 120, heating rod; 121, first segment heating rod; 122, second segment heating rod; 123, third segment heating rod; 130, screw; 140, cable; 200, hot nozzle body; 210, hot nozzle runner; 300, nozzle tip; 400, hot nozzle heater; 2000, valve needle hanging table; 2100, second connecting part; 2200, notch; 3000, temperature control box. DETAILED DESCRIPTION

[0032] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0033] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position shown in the drawings, and are only for the convenience of description, and cannot be understood as a limitation on the technical solutions. The terms "first", "second" are only for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0034] Referring to Figure 1 , the present embodiment provides a valve needle structure 100, comprising: a valve needle body 110, wherein a cavity 111 is arranged in the valve needle body 110; and a heating rod 120, wherein the heating rod 120 is arranged in the cavity 111 and transmits heat to the valve needle body 110.

[0035] The working principle and beneficial effects of the valve needle structure 100 provided by the present embodiment are as follows:

[0036] The valve needle structure 100 provided by the present embodiment is arranged with the cavity 111 in the valve needle body 110, and the heating rod 120 is placed in the cavity 111. The heat generated by the heating rod 120 is transmitted to the valve needle body 110, so as to increase the temperature of the valve needle body 110. The valve needle body 110 transmits the heat to the plastic inside the hot nozzle structure, so that the valve needle head can seal the gate during injection molding, even during cooling and pressure holding. The situation of valve needle retreat is completely avoided, the yield of injection molded products is improved, and the valve needle structure 100 provided by the present embodiment has simple structure, convenient manufacturing and low cost.

[0037] In a preferred embodiment, referring to Figure 1 and Figure 2 , the valve needle body 110 comprises a first valve needle segment 110a, a second valve needle segment 110b and a third valve needle segment 110c arranged in sequence, and the first valve needle segment 110a, the second valve needle segment 110b and the third valve needle segment 110c are of an integrated structure.

[0038] The second valve needle segment 110b is arranged in the hot nozzle flow channel 210, and the length of the second valve needle segment 110b corresponds to the length of the hot nozzle heater 400, the first valve needle segment 110a extends out of the hot nozzle flow channel 210 and is arranged close to the end of the mold cavity, and the third valve needle segment 110c extends out of the hot nozzle flow channel 210 and is arranged close to the end of the valve needle hanging table 2000.

[0039] The cavity 111 includes a first cavity 1111, a second cavity 1112, and a third cavity 1113 connected in sequence, the first valve needle segment 110a, the second valve needle segment 110b, and the third valve needle segment 110c are respectively provided with the first cavity 1111, the second cavity 1112, and the third cavity 1113, and the first cavity 1111 extends to the end of the first valve needle segment 110a, and the end of the first valve needle segment 110a is sealed.

[0040] The first valve needle segment 110a is the valve needle head mentioned above, and since the first cavity 1111 extends to the end of the first valve needle segment 110a, and the end of the first valve needle segment 110a is sealed, this arrangement allows the valve needle structure 100 to be heated by the heating rod 120 when the valve needle structure 100 moves up and down, that is, after the nozzle tip 300 is extended out of the valve needle structure 100, the valve needle structure 100 between the nozzle tip 300 and the mold cavity is also heated by the heating rod 120, so that the valve needle structure 100 can completely seal the gate and complete the injection molding.

[0041] It should be understood that the lengths of the first valve needle segment 110a, the second valve needle segment 110b, and the third valve needle segment 110c can be customized according to actual needs, and the lengths of the first valve needle segment 110a, the second valve needle segment 110b, and the third valve needle segment 110c are not limited in this embodiment.

[0042] In a preferred embodiment, the heating rod 120 includes a first heating rod 121, and the first cavity 1111 is provided with the first heating rod 121.

[0043] The first heating rod 121 is arranged in the first cavity 1111, and the first heating rod 121 transmits heat to the first valve needle segment 110a, that is, the first valve needle segment 110a transmits heat to the plastic around the first valve needle segment 110a, so that the plastic is in a molten state during cooling and pressure maintaining, avoiding solidification of the plastic during cooling and pressure maintaining. That is, no heating rod 120 is arranged in the second cavity 1112 and the third cavity 1113, that is, there is no heat transmission in the second valve needle segment 110b and the third valve needle segment 110c, and the plastic in the second valve needle segment 110b corresponding to the hot nozzle flow channel 210 can be heated and melted by the hot nozzle heater 400 arranged outside the hot nozzle body 200, which reduces the use of the heating rod 120, thereby achieving energy saving.

[0044] In another preferred embodiment, the heat stick 120 comprises a first heat stick 121 and a second heat stick 122, and the first heat stick 121 and the second heat stick 122 are in an integrated structure, the first heat stick 121 is arranged in the first cavity 1111, and the second heat stick 122 is arranged in the second cavity 1112.

[0045] The second heat stick 122 arranged in the second cavity 1112 transmits heat to the plastic around the second valve needle segment 110b, so as to supplement heat from the inside to the outside. The plastic arranged in the hot nozzle flow channel 210 corresponding to the second valve needle segment 110b can also be heated and melted by the hot nozzle heater 400 arranged outside the hot nozzle body 200, so as to supplement heat from the outside to the inside. Therefore, the heat stick 120 arranged in the second cavity 1112 and the hot nozzle heater 400 are complementary, so that the plastic in the hot nozzle flow channel 210 is heated more uniformly. The first heat stick 121 arranged in the first cavity 1111 transmits heat to the first valve needle segment 110a, that is, the first valve needle segment 110a transmits heat to the plastic around the first valve needle segment 110a, so that the plastic is in a molten state during cooling and pressure maintaining, and solidification of the plastic during cooling and pressure maintaining is avoided.

[0046] Optionally, the diameter of the first heat stick 121 is not less than the diameter of the second heat stick 122. The greater the diameter of the heat stick 120, the greater the heat generated, that is, the heat generated by the first heat stick 121 is not less than the heat generated by the second heat stick 122.

[0047] Optionally, the diameter of the first heat stick 121 is greater than the diameter of the second heat stick 122, so that the heat of the first valve needle segment 110a is greater than the heat of the second valve needle segment 110b, and energy saving is realized under the condition that the plastic is in a molten state during cooling and pressure maintaining.

[0048] Optionally, the diameter of the first heat stick 121 is greater than the diameter of the second heat stick 122, so that the heat stick is easier to manufacture.

[0049] In yet another preferred embodiment, please refer to Figures 1 to 3The heating rod 120 comprises a first heating rod 121, a second heating rod 122 and a third heating rod 123, and the first heating rod 121, the second heating rod 122 and the third heating rod 123 are in an integrated structure. The first heating rod 121 is arranged in the first cavity 1111, the second heating rod 122 is arranged in the second cavity 1112, and the third heating rod 123 is arranged in the third cavity 1113. This arrangement makes the heating rod 120 more integrated and easier to manufacture. The third heating rod 123 has a preheating function. The second heating rod 122 enables the second valve needle segment 110b to transfer heat to the plastic around the second valve needle segment 110b, thereby supplementing heat from the inside to the outside. The plastic arranged in the hot nozzle flow channel 210 corresponding to the second valve needle segment 110b can also be heated and melted by the hot nozzle heater 400 arranged outside the hot nozzle body 200, thereby supplementing heat from the outside to the inside. The heating rod 120 arranged in the second cavity 1112 and the hot nozzle heater 400 form a complement, so that the plastic in the hot nozzle flow channel 210 is heated more uniformly. The first heating rod 121 arranged in the first cavity 1111 transfers heat to the first valve needle segment 110a, that is, the first valve needle segment 110a transfers heat to the plastic around the first valve needle segment 110a, so that the plastic is in a molten state during cooling and pressure maintaining, avoiding solidification of the plastic during cooling and pressure maintaining.

[0050] Optionally, the diameter of the first heating rod 121 is not less than the diameter of the second heating rod 122, and the diameter of the second heating rod 122 is not less than the diameter of the third heating rod 120. The larger the diameter of the heating rod 120, the greater the heat generated, that is, the heat generated by the first heating rod 121 is not less than the heat generated by the second heating rod 122, and the heat generated by the second heating rod 121 is not less than the heat generated by the third heating rod 122.

[0051] Optionally, the diameter of the first heating rod 121 is greater than the diameter of the second heating rod 122, and the diameter of the second heating rod 122 is greater than the diameter of the third heating rod 120, so that the heat generated by the first valve needle segment 110a is greater than the heat generated by the second valve needle segment 110b, and the heat generated by the second valve needle segment 110b is greater than the heat generated by the third valve needle segment 110c, thereby ensuring that the plastic is in a molten state during cooling and pressure maintaining, and the plastic in the hot nozzle flow channel 210 is sufficiently melted by the cooperation of the second heating rod 122 and the hot nozzle heater 400, thereby achieving energy saving.

[0052] Optionally, the diameter of the first section of the heating rod 121 is the same as the diameter of the second section of the heating rod 122 and the diameter of the third section of the heating rod 120, so that the manufacturing process of the heating rod 120 is simpler.

[0053] In a preferred embodiment, referring to Figure 1 and Figure 3 , the top of the valve needle body 110 is provided with a mounting hole 112, the mounting hole 112 is in communication with the cavity 111, and the inner diameter of the mounting hole 112 is greater than the inner diameter of the cavity 111 to form a limiting step 113, a screw 130 is arranged in the mounting hole 112, and the screw 130 is threadedly connected with the mounting hole 112 and limited by the limiting step 113. In this way, the heating rod 120 can be stably fixed in the cavity 111.

[0054] Optionally, after the screw 130 is threadedly connected with the mounting hole 112, welding connection is adopted. In this way, the heating rod 120 can be more stably fixed in the cavity 111.

[0055] In a preferred embodiment, referring to Figure 1 and Figure 3 , the top of the valve needle body 110 is provided with a first connecting portion 114, and the first connecting portion 114 is used for cooperating with the valve needle hanging table 2000. Through the arrangement of the first connecting portion 114, the connection between the valve needle structure 100 and the valve needle hanging table 2000 is realized.

[0056] In a preferred embodiment, referring to Figure 3 , the side surface of the top of the valve needle body 110 is provided with a wire outlet hole 115, and the cable 140 of the heating rod 120 passes out from the wire outlet hole 115. The arrangement of the wire outlet hole 115 facilitates the electrical connection between the cable 140 of the heating rod 120 and the external temperature control box 3000 after the cable 140 passes out.

[0057] In a preferred embodiment, referring to Figure 3 , the heating rod 120 is in a cylindrical shape.

[0058] In another preferred embodiment, the heating rod 120 is in a spiral shape, which can increase the heating area of the heating rod 120.

[0059] It should be understood that the shape of the heating rod 120 is not limited to the above-mentioned cylindrical shape and spiral shape, and other shapes are also possible, which are not limited herein.

[0060] In a preferred embodiment, the diameter of the heating rod 120 is 4mm-10mm.

[0061] Optionally, the diameter of the heating rod 120 is 4mm.

[0062] Optionally, the diameter of the heating rod 120 is 7mm.

[0063] Optionally, the diameter of the heating rod 120 is 10mm.

[0064] It should be understood that the diameter of the heating rod 120 is not limited to the above-mentioned cases, but can also be other cases, which are not limited here.

[0065] In a preferred embodiment, the heating rod 120 is externally sleeved with a soft rubber sleeve (not shown in the figure, the same below), the heating rod 120 and the soft rubber sleeve are placed in the cavity 111, and the soft rubber sleeve is in contact with the wall of the cavity 111. In this way, the heating rod 120 placed in the cavity 111 can be prevented from shaking in the cavity 111, so that the heating rod 120 can be stably placed in the cavity 111.

[0066] Referring to Figure 4 The embodiment also provides a hot nozzle structure 1000, which comprises the valve needle structure 100 described above, and further comprises a hot nozzle body 200, a nozzle tip 300, and a hot nozzle heater 400. The hot nozzle heater 400 is annularly arranged at the periphery of the hot nozzle body 200. The nozzle tip 300 is arranged below the hot nozzle body 200 and is connected with the hot nozzle body 200. The hot nozzle body 200 is internally provided with a hot nozzle flow channel 210. The valve needle structure 100 is arranged in the hot nozzle flow channel 210 and penetrates through the nozzle tip 300. Since the valve needle structure 100 has been described in detail above, no further description is given here.

[0067] Referring to Figure 5 The embodiment also provides a hot runner system 10000, which comprises the hot nozzle structure 1000 described above, and further comprises a valve needle hanging table 2000. The valve needle hanging table 2000 is provided with a second connecting part 2100, which is used for connecting with the valve needle structure 100. Since the hot nozzle structure 1000 has been described in detail above, no further description is given here.

[0068] Optionally, the second connecting part 2100 is connected with the first connecting part 114. In this way, the valve needle structure 100 can be stably connected with the valve needle hanging table 2000.

[0069] Optionally, the first connecting part 114 is a connecting convex ring, the second connecting part 2100 is a connecting concave groove, and the side wall of the connecting concave groove is provided with a notch 2200, the connecting convex ring is placed in the connecting concave groove through the notch 2200, the connection of the valve needle structure 100 and the valve needle hanging table 2000 is realized, and the cable 140 of the heating rod 120 is pulled out through the notch 2200 and then electrically connected with the external temperature control box 3000.

[0070] In summary, the valve needle structure 100 provided by the embodiment includes a valve needle body 110, a cavity 111 arranged in the valve needle body 110, and a heating rod 120 arranged in the cavity 111 and used for transferring heat to the valve needle body 110. The hot nozzle structure 1000 includes the valve needle structure 100, a hot nozzle body 200, a nozzle tip 300, and a hot nozzle heater 400. The hot nozzle heater 400 is arranged around the periphery of the hot nozzle body 200. The nozzle tip 300 is arranged below the hot nozzle body 200 and connected with the hot nozzle body 200. A hot nozzle flow channel 210 is arranged in the hot nozzle body 200. The valve needle structure 100 is arranged in the hot nozzle flow channel 210 and pulled out of the nozzle tip 300. The hot runner system 10000 includes the hot nozzle structure 1000 and a valve needle hanging table 2000. The valve needle hanging table 2000 is provided with a second connecting part 2100 used for connecting with the valve needle structure 100. The valve needle structure 100, the hot nozzle structure 1000, and the hot runner system 10000 provided by the embodiment have the following advantages. The cavity 111 is arranged in the valve needle body 110, and the heating rod 120 is arranged in the cavity 111. The heat generated by the heating rod 120 is transferred to the valve needle body 110, so that the temperature of the valve needle body 110 is increased. The valve needle body 110 further transfers the heat to the plastic in the hot nozzle structure, so that the valve needle head can seal the gate when the plastic is injected, even when the cooling and pressure maintaining are performed. The situation that the valve needle retreats is completely avoided, and the yield of the injection molded product is improved. The valve needle structure 100 provided by the embodiment has the advantages of simple structure, convenient manufacturing, and low cost.

[0071] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hot runner system characterized by, The hot nozzle structure comprises a valve needle structure, and further comprises a hot nozzle body, a nozzle tip and a hot nozzle heater, the hot nozzle heater is annularly arranged at the periphery of the hot nozzle body, the nozzle tip is arranged below the hot nozzle body and connected with the hot nozzle body, a hot nozzle flow channel is arranged in the hot nozzle body, and the valve needle structure is arranged in the hot nozzle flow channel and extends out of the nozzle tip. The valve needle structure comprises: a valve needle body, wherein a cavity is arranged in the valve needle body; a heating rod, wherein the heating rod is arranged in the cavity and transmits heat to the valve needle body; the valve needle body comprises a first valve needle segment, a second valve needle segment and a third valve needle segment arranged in sequence, and the first valve needle segment, the second valve needle segment and the third valve needle segment are integrated structures; the second valve needle segment is arranged in the hot nozzle flow channel, the length of the second valve needle segment corresponds to the length of the hot nozzle heater, the first valve needle segment extends out of the hot nozzle flow channel and is arranged close to the end of the mold cavity, and the third valve needle segment extends out of the hot nozzle flow channel and is arranged close to the end of the valve needle hanging table; the cavity comprises a first cavity, a second cavity and a third cavity connected in sequence, the first valve needle segment, the second valve needle segment and the third valve needle segment are respectively provided with the first cavity, the second cavity and the third cavity, and the first cavity extends to the end of the first valve needle segment, and the end of the first valve needle segment is sealed; the heating rod comprises a first heating rod, a second heating rod and a third heating rod, and the first heating rod, the second heating rod and the third heating rod are integrated structures, the first cavity is provided with the first heating rod, the second cavity is provided with the second heating rod, and the third cavity is provided with the third heating rod; the diameter of the first heating rod is greater than the diameter of the second heating rod, and the diameter of the second heating rod is greater than the diameter of the third heating rod; the heating rod is in a spiral shape; the top of the valve needle body is provided with a mounting hole, the mounting hole is communicated with the cavity, the inner diameter of the mounting hole is greater than the inner diameter of the cavity to form a limiting step, a screw is arranged in the mounting hole, the screw is threadedly connected with the mounting hole and is limited by the limiting step, and the screw is threadedly connected with the mounting hole and then welded; the top of the valve needle body is provided with a first connecting part for cooperating with the valve needle hanging table; the hot runner system further comprises a valve needle hanging table, the valve needle hanging table is provided with a second connecting part, and the second connecting part is connected with the first connecting part; the first connecting part is a connecting convex ring, the second connecting part is a connecting groove, and the side wall of the connecting groove is provided with a notch, the connecting convex ring is arranged in the connecting groove through the notch to realize the connection of the valve needle structure and the valve needle hanging table, and the cable of the heating rod is pulled out through the notch to realize the electrical connection with the external temperature control box.

2. The hot- runner system of claim 1, wherein the side surface of the top of the valve needle body is provided with a wire outlet hole, and the cable of the heating rod is pulled out from the wire outlet hole.

3. The hot- runner system of claim 1, wherein the diameter of the heating rod is 4mm-10mm.

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